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34dc7c2f 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 | /* | |
428870ff | 22 | * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. |
ef3c1dea | 23 | * Copyright 2011 Nexenta Systems, Inc. All rights reserved. |
c3bd3fb4 | 24 | * Copyright (c) 2012, 2018 by Delphix. All rights reserved. |
3a17a7a9 | 25 | * Copyright (c) 2013 by Saso Kiselkov. All rights reserved. |
0c66c32d | 26 | * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved. |
34dc7c2f BB |
27 | */ |
28 | ||
34dc7c2f | 29 | #include <sys/zfs_context.h> |
c28b2279 | 30 | #include <sys/arc.h> |
34dc7c2f | 31 | #include <sys/dmu.h> |
ea97f8ce | 32 | #include <sys/dmu_send.h> |
34dc7c2f BB |
33 | #include <sys/dmu_impl.h> |
34 | #include <sys/dbuf.h> | |
35 | #include <sys/dmu_objset.h> | |
36 | #include <sys/dsl_dataset.h> | |
37 | #include <sys/dsl_dir.h> | |
38 | #include <sys/dmu_tx.h> | |
39 | #include <sys/spa.h> | |
40 | #include <sys/zio.h> | |
41 | #include <sys/dmu_zfetch.h> | |
428870ff BB |
42 | #include <sys/sa.h> |
43 | #include <sys/sa_impl.h> | |
9b67f605 MA |
44 | #include <sys/zfeature.h> |
45 | #include <sys/blkptr.h> | |
9bd274dd | 46 | #include <sys/range_tree.h> |
49ee64e5 | 47 | #include <sys/trace_dbuf.h> |
d3c2ae1c | 48 | #include <sys/callb.h> |
a6255b7f | 49 | #include <sys/abd.h> |
a1d477c2 | 50 | #include <sys/vdev.h> |
37fb3e43 | 51 | #include <sys/cityhash.h> |
2e5dc449 | 52 | #include <sys/spa_impl.h> |
34dc7c2f | 53 | |
5e021f56 GDN |
54 | kstat_t *dbuf_ksp; |
55 | ||
56 | typedef struct dbuf_stats { | |
57 | /* | |
58 | * Various statistics about the size of the dbuf cache. | |
59 | */ | |
60 | kstat_named_t cache_count; | |
61 | kstat_named_t cache_size_bytes; | |
62 | kstat_named_t cache_size_bytes_max; | |
63 | /* | |
64 | * Statistics regarding the bounds on the dbuf cache size. | |
65 | */ | |
66 | kstat_named_t cache_target_bytes; | |
67 | kstat_named_t cache_lowater_bytes; | |
68 | kstat_named_t cache_hiwater_bytes; | |
69 | /* | |
70 | * Total number of dbuf cache evictions that have occurred. | |
71 | */ | |
72 | kstat_named_t cache_total_evicts; | |
73 | /* | |
74 | * The distribution of dbuf levels in the dbuf cache and | |
75 | * the total size of all dbufs at each level. | |
76 | */ | |
77 | kstat_named_t cache_levels[DN_MAX_LEVELS]; | |
78 | kstat_named_t cache_levels_bytes[DN_MAX_LEVELS]; | |
79 | /* | |
80 | * Statistics about the dbuf hash table. | |
81 | */ | |
82 | kstat_named_t hash_hits; | |
83 | kstat_named_t hash_misses; | |
84 | kstat_named_t hash_collisions; | |
85 | kstat_named_t hash_elements; | |
86 | kstat_named_t hash_elements_max; | |
87 | /* | |
88 | * Number of sublists containing more than one dbuf in the dbuf | |
89 | * hash table. Keep track of the longest hash chain. | |
90 | */ | |
91 | kstat_named_t hash_chains; | |
92 | kstat_named_t hash_chain_max; | |
93 | /* | |
94 | * Number of times a dbuf_create() discovers that a dbuf was | |
95 | * already created and in the dbuf hash table. | |
96 | */ | |
97 | kstat_named_t hash_insert_race; | |
2e5dc449 MA |
98 | /* |
99 | * Statistics about the size of the metadata dbuf cache. | |
100 | */ | |
101 | kstat_named_t metadata_cache_count; | |
102 | kstat_named_t metadata_cache_size_bytes; | |
103 | kstat_named_t metadata_cache_size_bytes_max; | |
104 | /* | |
105 | * For diagnostic purposes, this is incremented whenever we can't add | |
106 | * something to the metadata cache because it's full, and instead put | |
107 | * the data in the regular dbuf cache. | |
108 | */ | |
109 | kstat_named_t metadata_cache_overflow; | |
5e021f56 GDN |
110 | } dbuf_stats_t; |
111 | ||
112 | dbuf_stats_t dbuf_stats = { | |
113 | { "cache_count", KSTAT_DATA_UINT64 }, | |
114 | { "cache_size_bytes", KSTAT_DATA_UINT64 }, | |
115 | { "cache_size_bytes_max", KSTAT_DATA_UINT64 }, | |
116 | { "cache_target_bytes", KSTAT_DATA_UINT64 }, | |
117 | { "cache_lowater_bytes", KSTAT_DATA_UINT64 }, | |
118 | { "cache_hiwater_bytes", KSTAT_DATA_UINT64 }, | |
119 | { "cache_total_evicts", KSTAT_DATA_UINT64 }, | |
120 | { { "cache_levels_N", KSTAT_DATA_UINT64 } }, | |
121 | { { "cache_levels_bytes_N", KSTAT_DATA_UINT64 } }, | |
122 | { "hash_hits", KSTAT_DATA_UINT64 }, | |
123 | { "hash_misses", KSTAT_DATA_UINT64 }, | |
124 | { "hash_collisions", KSTAT_DATA_UINT64 }, | |
125 | { "hash_elements", KSTAT_DATA_UINT64 }, | |
126 | { "hash_elements_max", KSTAT_DATA_UINT64 }, | |
127 | { "hash_chains", KSTAT_DATA_UINT64 }, | |
128 | { "hash_chain_max", KSTAT_DATA_UINT64 }, | |
2e5dc449 MA |
129 | { "hash_insert_race", KSTAT_DATA_UINT64 }, |
130 | { "metadata_cache_count", KSTAT_DATA_UINT64 }, | |
131 | { "metadata_cache_size_bytes", KSTAT_DATA_UINT64 }, | |
132 | { "metadata_cache_size_bytes_max", KSTAT_DATA_UINT64 }, | |
133 | { "metadata_cache_overflow", KSTAT_DATA_UINT64 } | |
5e021f56 GDN |
134 | }; |
135 | ||
136 | #define DBUF_STAT_INCR(stat, val) \ | |
137 | atomic_add_64(&dbuf_stats.stat.value.ui64, (val)); | |
138 | #define DBUF_STAT_DECR(stat, val) \ | |
139 | DBUF_STAT_INCR(stat, -(val)); | |
140 | #define DBUF_STAT_BUMP(stat) \ | |
141 | DBUF_STAT_INCR(stat, 1); | |
142 | #define DBUF_STAT_BUMPDOWN(stat) \ | |
143 | DBUF_STAT_INCR(stat, -1); | |
144 | #define DBUF_STAT_MAX(stat, v) { \ | |
145 | uint64_t _m; \ | |
146 | while ((v) > (_m = dbuf_stats.stat.value.ui64) && \ | |
147 | (_m != atomic_cas_64(&dbuf_stats.stat.value.ui64, _m, (v))))\ | |
148 | continue; \ | |
149 | } | |
150 | ||
adb726eb | 151 | typedef struct dbuf_hold_arg { |
fc5bb51f BB |
152 | /* Function arguments */ |
153 | dnode_t *dh_dn; | |
154 | uint8_t dh_level; | |
155 | uint64_t dh_blkid; | |
fcff0f35 PD |
156 | boolean_t dh_fail_sparse; |
157 | boolean_t dh_fail_uncached; | |
fc5bb51f BB |
158 | void *dh_tag; |
159 | dmu_buf_impl_t **dh_dbp; | |
160 | /* Local variables */ | |
161 | dmu_buf_impl_t *dh_db; | |
162 | dmu_buf_impl_t *dh_parent; | |
163 | blkptr_t *dh_bp; | |
164 | int dh_err; | |
165 | dbuf_dirty_record_t *dh_dr; | |
adb726eb | 166 | } dbuf_hold_arg_t; |
fc5bb51f | 167 | |
adb726eb MA |
168 | static dbuf_hold_arg_t *dbuf_hold_arg_create(dnode_t *dn, uint8_t level, |
169 | uint64_t blkid, boolean_t fail_sparse, boolean_t fail_uncached, | |
170 | void *tag, dmu_buf_impl_t **dbp); | |
171 | static int dbuf_hold_impl_arg(dbuf_hold_arg_t *dh); | |
172 | static void dbuf_hold_arg_destroy(dbuf_hold_arg_t *dh); | |
fc5bb51f | 173 | |
13fe0198 | 174 | static boolean_t dbuf_undirty(dmu_buf_impl_t *db, dmu_tx_t *tx); |
b128c09f | 175 | static void dbuf_write(dbuf_dirty_record_t *dr, arc_buf_t *data, dmu_tx_t *tx); |
34dc7c2f | 176 | |
0c66c32d | 177 | extern inline void dmu_buf_init_user(dmu_buf_user_t *dbu, |
39efbde7 GM |
178 | dmu_buf_evict_func_t *evict_func_sync, |
179 | dmu_buf_evict_func_t *evict_func_async, | |
180 | dmu_buf_t **clear_on_evict_dbufp); | |
0c66c32d | 181 | |
34dc7c2f BB |
182 | /* |
183 | * Global data structures and functions for the dbuf cache. | |
184 | */ | |
d3c2ae1c | 185 | static kmem_cache_t *dbuf_kmem_cache; |
0c66c32d | 186 | static taskq_t *dbu_evict_taskq; |
34dc7c2f | 187 | |
d3c2ae1c GW |
188 | static kthread_t *dbuf_cache_evict_thread; |
189 | static kmutex_t dbuf_evict_lock; | |
190 | static kcondvar_t dbuf_evict_cv; | |
191 | static boolean_t dbuf_evict_thread_exit; | |
192 | ||
193 | /* | |
2e5dc449 MA |
194 | * There are two dbuf caches; each dbuf can only be in one of them at a time. |
195 | * | |
196 | * 1. Cache of metadata dbufs, to help make read-heavy administrative commands | |
197 | * from /sbin/zfs run faster. The "metadata cache" specifically stores dbufs | |
198 | * that represent the metadata that describes filesystems/snapshots/ | |
199 | * bookmarks/properties/etc. We only evict from this cache when we export a | |
200 | * pool, to short-circuit as much I/O as possible for all administrative | |
201 | * commands that need the metadata. There is no eviction policy for this | |
202 | * cache, because we try to only include types in it which would occupy a | |
203 | * very small amount of space per object but create a large impact on the | |
204 | * performance of these commands. Instead, after it reaches a maximum size | |
205 | * (which should only happen on very small memory systems with a very large | |
206 | * number of filesystem objects), we stop taking new dbufs into the | |
207 | * metadata cache, instead putting them in the normal dbuf cache. | |
208 | * | |
209 | * 2. LRU cache of dbufs. The dbuf cache maintains a list of dbufs that | |
210 | * are not currently held but have been recently released. These dbufs | |
211 | * are not eligible for arc eviction until they are aged out of the cache. | |
212 | * Dbufs that are aged out of the cache will be immediately destroyed and | |
213 | * become eligible for arc eviction. | |
214 | * | |
215 | * Dbufs are added to these caches once the last hold is released. If a dbuf is | |
216 | * later accessed and still exists in the dbuf cache, then it will be removed | |
217 | * from the cache and later re-added to the head of the cache. | |
218 | * | |
219 | * If a given dbuf meets the requirements for the metadata cache, it will go | |
220 | * there, otherwise it will be considered for the generic LRU dbuf cache. The | |
221 | * caches and the refcounts tracking their sizes are stored in an array indexed | |
222 | * by those caches' matching enum values (from dbuf_cached_state_t). | |
d3c2ae1c | 223 | */ |
2e5dc449 MA |
224 | typedef struct dbuf_cache { |
225 | multilist_t *cache; | |
c13060e4 | 226 | zfs_refcount_t size; |
2e5dc449 MA |
227 | } dbuf_cache_t; |
228 | dbuf_cache_t dbuf_caches[DB_CACHE_MAX]; | |
d3c2ae1c | 229 | |
2e5dc449 MA |
230 | /* Size limits for the caches */ |
231 | unsigned long dbuf_cache_max_bytes = 0; | |
232 | unsigned long dbuf_metadata_cache_max_bytes = 0; | |
233 | /* Set the default sizes of the caches to log2 fraction of arc size */ | |
de4f8d5d | 234 | int dbuf_cache_shift = 5; |
2e5dc449 | 235 | int dbuf_metadata_cache_shift = 6; |
d3c2ae1c GW |
236 | |
237 | /* | |
2e5dc449 | 238 | * The LRU dbuf cache uses a three-stage eviction policy: |
d3c2ae1c GW |
239 | * - A low water marker designates when the dbuf eviction thread |
240 | * should stop evicting from the dbuf cache. | |
241 | * - When we reach the maximum size (aka mid water mark), we | |
242 | * signal the eviction thread to run. | |
243 | * - The high water mark indicates when the eviction thread | |
244 | * is unable to keep up with the incoming load and eviction must | |
245 | * happen in the context of the calling thread. | |
246 | * | |
247 | * The dbuf cache: | |
248 | * (max size) | |
249 | * low water mid water hi water | |
250 | * +----------------------------------------+----------+----------+ | |
251 | * | | | | | |
252 | * | | | | | |
253 | * | | | | | |
254 | * | | | | | |
255 | * +----------------------------------------+----------+----------+ | |
256 | * stop signal evict | |
257 | * evicting eviction directly | |
258 | * thread | |
259 | * | |
260 | * The high and low water marks indicate the operating range for the eviction | |
261 | * thread. The low water mark is, by default, 90% of the total size of the | |
262 | * cache and the high water mark is at 110% (both of these percentages can be | |
263 | * changed by setting dbuf_cache_lowater_pct and dbuf_cache_hiwater_pct, | |
264 | * respectively). The eviction thread will try to ensure that the cache remains | |
265 | * within this range by waking up every second and checking if the cache is | |
266 | * above the low water mark. The thread can also be woken up by callers adding | |
267 | * elements into the cache if the cache is larger than the mid water (i.e max | |
268 | * cache size). Once the eviction thread is woken up and eviction is required, | |
269 | * it will continue evicting buffers until it's able to reduce the cache size | |
270 | * to the low water mark. If the cache size continues to grow and hits the high | |
4e33ba4c | 271 | * water mark, then callers adding elements to the cache will begin to evict |
d3c2ae1c GW |
272 | * directly from the cache until the cache is no longer above the high water |
273 | * mark. | |
274 | */ | |
275 | ||
276 | /* | |
277 | * The percentage above and below the maximum cache size. | |
278 | */ | |
279 | uint_t dbuf_cache_hiwater_pct = 10; | |
280 | uint_t dbuf_cache_lowater_pct = 10; | |
281 | ||
34dc7c2f BB |
282 | /* ARGSUSED */ |
283 | static int | |
284 | dbuf_cons(void *vdb, void *unused, int kmflag) | |
285 | { | |
286 | dmu_buf_impl_t *db = vdb; | |
287 | bzero(db, sizeof (dmu_buf_impl_t)); | |
288 | ||
289 | mutex_init(&db->db_mtx, NULL, MUTEX_DEFAULT, NULL); | |
290 | cv_init(&db->db_changed, NULL, CV_DEFAULT, NULL); | |
d3c2ae1c | 291 | multilist_link_init(&db->db_cache_link); |
424fd7c3 | 292 | zfs_refcount_create(&db->db_holds); |
8951cb8d | 293 | |
34dc7c2f BB |
294 | return (0); |
295 | } | |
296 | ||
297 | /* ARGSUSED */ | |
298 | static void | |
299 | dbuf_dest(void *vdb, void *unused) | |
300 | { | |
301 | dmu_buf_impl_t *db = vdb; | |
302 | mutex_destroy(&db->db_mtx); | |
303 | cv_destroy(&db->db_changed); | |
d3c2ae1c | 304 | ASSERT(!multilist_link_active(&db->db_cache_link)); |
424fd7c3 | 305 | zfs_refcount_destroy(&db->db_holds); |
34dc7c2f BB |
306 | } |
307 | ||
308 | /* | |
309 | * dbuf hash table routines | |
310 | */ | |
311 | static dbuf_hash_table_t dbuf_hash_table; | |
312 | ||
313 | static uint64_t dbuf_hash_count; | |
314 | ||
37fb3e43 PD |
315 | /* |
316 | * We use Cityhash for this. It's fast, and has good hash properties without | |
317 | * requiring any large static buffers. | |
318 | */ | |
34dc7c2f BB |
319 | static uint64_t |
320 | dbuf_hash(void *os, uint64_t obj, uint8_t lvl, uint64_t blkid) | |
321 | { | |
37fb3e43 | 322 | return (cityhash4((uintptr_t)os, obj, (uint64_t)lvl, blkid)); |
34dc7c2f BB |
323 | } |
324 | ||
34dc7c2f BB |
325 | #define DBUF_EQUAL(dbuf, os, obj, level, blkid) \ |
326 | ((dbuf)->db.db_object == (obj) && \ | |
327 | (dbuf)->db_objset == (os) && \ | |
328 | (dbuf)->db_level == (level) && \ | |
329 | (dbuf)->db_blkid == (blkid)) | |
330 | ||
331 | dmu_buf_impl_t * | |
6ebebace | 332 | dbuf_find(objset_t *os, uint64_t obj, uint8_t level, uint64_t blkid) |
34dc7c2f BB |
333 | { |
334 | dbuf_hash_table_t *h = &dbuf_hash_table; | |
d6320ddb BB |
335 | uint64_t hv; |
336 | uint64_t idx; | |
34dc7c2f BB |
337 | dmu_buf_impl_t *db; |
338 | ||
d3c2ae1c | 339 | hv = dbuf_hash(os, obj, level, blkid); |
d6320ddb BB |
340 | idx = hv & h->hash_table_mask; |
341 | ||
34dc7c2f BB |
342 | mutex_enter(DBUF_HASH_MUTEX(h, idx)); |
343 | for (db = h->hash_table[idx]; db != NULL; db = db->db_hash_next) { | |
344 | if (DBUF_EQUAL(db, os, obj, level, blkid)) { | |
345 | mutex_enter(&db->db_mtx); | |
346 | if (db->db_state != DB_EVICTING) { | |
347 | mutex_exit(DBUF_HASH_MUTEX(h, idx)); | |
348 | return (db); | |
349 | } | |
350 | mutex_exit(&db->db_mtx); | |
351 | } | |
352 | } | |
353 | mutex_exit(DBUF_HASH_MUTEX(h, idx)); | |
354 | return (NULL); | |
355 | } | |
356 | ||
6ebebace JG |
357 | static dmu_buf_impl_t * |
358 | dbuf_find_bonus(objset_t *os, uint64_t object) | |
359 | { | |
360 | dnode_t *dn; | |
361 | dmu_buf_impl_t *db = NULL; | |
362 | ||
363 | if (dnode_hold(os, object, FTAG, &dn) == 0) { | |
364 | rw_enter(&dn->dn_struct_rwlock, RW_READER); | |
365 | if (dn->dn_bonus != NULL) { | |
366 | db = dn->dn_bonus; | |
367 | mutex_enter(&db->db_mtx); | |
368 | } | |
369 | rw_exit(&dn->dn_struct_rwlock); | |
370 | dnode_rele(dn, FTAG); | |
371 | } | |
372 | return (db); | |
373 | } | |
374 | ||
34dc7c2f BB |
375 | /* |
376 | * Insert an entry into the hash table. If there is already an element | |
377 | * equal to elem in the hash table, then the already existing element | |
378 | * will be returned and the new element will not be inserted. | |
379 | * Otherwise returns NULL. | |
380 | */ | |
381 | static dmu_buf_impl_t * | |
382 | dbuf_hash_insert(dmu_buf_impl_t *db) | |
383 | { | |
384 | dbuf_hash_table_t *h = &dbuf_hash_table; | |
428870ff | 385 | objset_t *os = db->db_objset; |
34dc7c2f BB |
386 | uint64_t obj = db->db.db_object; |
387 | int level = db->db_level; | |
d6320ddb | 388 | uint64_t blkid, hv, idx; |
34dc7c2f | 389 | dmu_buf_impl_t *dbf; |
5e021f56 | 390 | uint32_t i; |
34dc7c2f | 391 | |
d6320ddb | 392 | blkid = db->db_blkid; |
d3c2ae1c | 393 | hv = dbuf_hash(os, obj, level, blkid); |
d6320ddb BB |
394 | idx = hv & h->hash_table_mask; |
395 | ||
34dc7c2f | 396 | mutex_enter(DBUF_HASH_MUTEX(h, idx)); |
5e021f56 GDN |
397 | for (dbf = h->hash_table[idx], i = 0; dbf != NULL; |
398 | dbf = dbf->db_hash_next, i++) { | |
34dc7c2f BB |
399 | if (DBUF_EQUAL(dbf, os, obj, level, blkid)) { |
400 | mutex_enter(&dbf->db_mtx); | |
401 | if (dbf->db_state != DB_EVICTING) { | |
402 | mutex_exit(DBUF_HASH_MUTEX(h, idx)); | |
403 | return (dbf); | |
404 | } | |
405 | mutex_exit(&dbf->db_mtx); | |
406 | } | |
407 | } | |
408 | ||
5e021f56 GDN |
409 | if (i > 0) { |
410 | DBUF_STAT_BUMP(hash_collisions); | |
411 | if (i == 1) | |
412 | DBUF_STAT_BUMP(hash_chains); | |
413 | ||
414 | DBUF_STAT_MAX(hash_chain_max, i); | |
415 | } | |
416 | ||
34dc7c2f BB |
417 | mutex_enter(&db->db_mtx); |
418 | db->db_hash_next = h->hash_table[idx]; | |
419 | h->hash_table[idx] = db; | |
420 | mutex_exit(DBUF_HASH_MUTEX(h, idx)); | |
bc89ac84 | 421 | atomic_inc_64(&dbuf_hash_count); |
5e021f56 | 422 | DBUF_STAT_MAX(hash_elements_max, dbuf_hash_count); |
34dc7c2f BB |
423 | |
424 | return (NULL); | |
425 | } | |
426 | ||
2e5dc449 MA |
427 | /* |
428 | * This returns whether this dbuf should be stored in the metadata cache, which | |
429 | * is based on whether it's from one of the dnode types that store data related | |
430 | * to traversing dataset hierarchies. | |
431 | */ | |
432 | static boolean_t | |
433 | dbuf_include_in_metadata_cache(dmu_buf_impl_t *db) | |
434 | { | |
435 | DB_DNODE_ENTER(db); | |
436 | dmu_object_type_t type = DB_DNODE(db)->dn_type; | |
437 | DB_DNODE_EXIT(db); | |
438 | ||
439 | /* Check if this dbuf is one of the types we care about */ | |
440 | if (DMU_OT_IS_METADATA_CACHED(type)) { | |
441 | /* If we hit this, then we set something up wrong in dmu_ot */ | |
442 | ASSERT(DMU_OT_IS_METADATA(type)); | |
443 | ||
444 | /* | |
445 | * Sanity check for small-memory systems: don't allocate too | |
446 | * much memory for this purpose. | |
447 | */ | |
424fd7c3 TS |
448 | if (zfs_refcount_count( |
449 | &dbuf_caches[DB_DBUF_METADATA_CACHE].size) > | |
2e5dc449 MA |
450 | dbuf_metadata_cache_max_bytes) { |
451 | DBUF_STAT_BUMP(metadata_cache_overflow); | |
452 | return (B_FALSE); | |
453 | } | |
454 | ||
455 | return (B_TRUE); | |
456 | } | |
457 | ||
458 | return (B_FALSE); | |
459 | } | |
460 | ||
34dc7c2f | 461 | /* |
bd089c54 | 462 | * Remove an entry from the hash table. It must be in the EVICTING state. |
34dc7c2f BB |
463 | */ |
464 | static void | |
465 | dbuf_hash_remove(dmu_buf_impl_t *db) | |
466 | { | |
467 | dbuf_hash_table_t *h = &dbuf_hash_table; | |
d6320ddb | 468 | uint64_t hv, idx; |
34dc7c2f BB |
469 | dmu_buf_impl_t *dbf, **dbp; |
470 | ||
d3c2ae1c | 471 | hv = dbuf_hash(db->db_objset, db->db.db_object, |
d6320ddb BB |
472 | db->db_level, db->db_blkid); |
473 | idx = hv & h->hash_table_mask; | |
474 | ||
34dc7c2f | 475 | /* |
4e33ba4c | 476 | * We mustn't hold db_mtx to maintain lock ordering: |
34dc7c2f BB |
477 | * DBUF_HASH_MUTEX > db_mtx. |
478 | */ | |
424fd7c3 | 479 | ASSERT(zfs_refcount_is_zero(&db->db_holds)); |
34dc7c2f BB |
480 | ASSERT(db->db_state == DB_EVICTING); |
481 | ASSERT(!MUTEX_HELD(&db->db_mtx)); | |
482 | ||
483 | mutex_enter(DBUF_HASH_MUTEX(h, idx)); | |
484 | dbp = &h->hash_table[idx]; | |
485 | while ((dbf = *dbp) != db) { | |
486 | dbp = &dbf->db_hash_next; | |
487 | ASSERT(dbf != NULL); | |
488 | } | |
489 | *dbp = db->db_hash_next; | |
490 | db->db_hash_next = NULL; | |
5e021f56 GDN |
491 | if (h->hash_table[idx] && |
492 | h->hash_table[idx]->db_hash_next == NULL) | |
493 | DBUF_STAT_BUMPDOWN(hash_chains); | |
34dc7c2f | 494 | mutex_exit(DBUF_HASH_MUTEX(h, idx)); |
bc89ac84 | 495 | atomic_dec_64(&dbuf_hash_count); |
34dc7c2f BB |
496 | } |
497 | ||
0c66c32d JG |
498 | typedef enum { |
499 | DBVU_EVICTING, | |
500 | DBVU_NOT_EVICTING | |
501 | } dbvu_verify_type_t; | |
502 | ||
503 | static void | |
504 | dbuf_verify_user(dmu_buf_impl_t *db, dbvu_verify_type_t verify_type) | |
505 | { | |
506 | #ifdef ZFS_DEBUG | |
507 | int64_t holds; | |
508 | ||
509 | if (db->db_user == NULL) | |
510 | return; | |
511 | ||
512 | /* Only data blocks support the attachment of user data. */ | |
513 | ASSERT(db->db_level == 0); | |
514 | ||
515 | /* Clients must resolve a dbuf before attaching user data. */ | |
516 | ASSERT(db->db.db_data != NULL); | |
517 | ASSERT3U(db->db_state, ==, DB_CACHED); | |
518 | ||
424fd7c3 | 519 | holds = zfs_refcount_count(&db->db_holds); |
0c66c32d JG |
520 | if (verify_type == DBVU_EVICTING) { |
521 | /* | |
522 | * Immediate eviction occurs when holds == dirtycnt. | |
523 | * For normal eviction buffers, holds is zero on | |
524 | * eviction, except when dbuf_fix_old_data() calls | |
525 | * dbuf_clear_data(). However, the hold count can grow | |
526 | * during eviction even though db_mtx is held (see | |
527 | * dmu_bonus_hold() for an example), so we can only | |
528 | * test the generic invariant that holds >= dirtycnt. | |
529 | */ | |
530 | ASSERT3U(holds, >=, db->db_dirtycnt); | |
531 | } else { | |
bc4501f7 | 532 | if (db->db_user_immediate_evict == TRUE) |
0c66c32d JG |
533 | ASSERT3U(holds, >=, db->db_dirtycnt); |
534 | else | |
535 | ASSERT3U(holds, >, 0); | |
536 | } | |
537 | #endif | |
538 | } | |
539 | ||
34dc7c2f BB |
540 | static void |
541 | dbuf_evict_user(dmu_buf_impl_t *db) | |
542 | { | |
0c66c32d JG |
543 | dmu_buf_user_t *dbu = db->db_user; |
544 | ||
34dc7c2f BB |
545 | ASSERT(MUTEX_HELD(&db->db_mtx)); |
546 | ||
0c66c32d | 547 | if (dbu == NULL) |
34dc7c2f BB |
548 | return; |
549 | ||
0c66c32d JG |
550 | dbuf_verify_user(db, DBVU_EVICTING); |
551 | db->db_user = NULL; | |
552 | ||
553 | #ifdef ZFS_DEBUG | |
554 | if (dbu->dbu_clear_on_evict_dbufp != NULL) | |
555 | *dbu->dbu_clear_on_evict_dbufp = NULL; | |
556 | #endif | |
557 | ||
558 | /* | |
39efbde7 GM |
559 | * There are two eviction callbacks - one that we call synchronously |
560 | * and one that we invoke via a taskq. The async one is useful for | |
561 | * avoiding lock order reversals and limiting stack depth. | |
562 | * | |
563 | * Note that if we have a sync callback but no async callback, | |
564 | * it's likely that the sync callback will free the structure | |
565 | * containing the dbu. In that case we need to take care to not | |
566 | * dereference dbu after calling the sync evict func. | |
0c66c32d | 567 | */ |
a7004725 | 568 | boolean_t has_async = (dbu->dbu_evict_func_async != NULL); |
39efbde7 GM |
569 | |
570 | if (dbu->dbu_evict_func_sync != NULL) | |
571 | dbu->dbu_evict_func_sync(dbu); | |
572 | ||
573 | if (has_async) { | |
574 | taskq_dispatch_ent(dbu_evict_taskq, dbu->dbu_evict_func_async, | |
575 | dbu, 0, &dbu->dbu_tqent); | |
576 | } | |
34dc7c2f BB |
577 | } |
578 | ||
572e2857 BB |
579 | boolean_t |
580 | dbuf_is_metadata(dmu_buf_impl_t *db) | |
581 | { | |
cc79a5c2 BB |
582 | /* |
583 | * Consider indirect blocks and spill blocks to be meta data. | |
584 | */ | |
585 | if (db->db_level > 0 || db->db_blkid == DMU_SPILL_BLKID) { | |
572e2857 BB |
586 | return (B_TRUE); |
587 | } else { | |
588 | boolean_t is_metadata; | |
589 | ||
590 | DB_DNODE_ENTER(db); | |
9ae529ec | 591 | is_metadata = DMU_OT_IS_METADATA(DB_DNODE(db)->dn_type); |
572e2857 BB |
592 | DB_DNODE_EXIT(db); |
593 | ||
594 | return (is_metadata); | |
595 | } | |
596 | } | |
597 | ||
d3c2ae1c GW |
598 | |
599 | /* | |
600 | * This function *must* return indices evenly distributed between all | |
601 | * sublists of the multilist. This is needed due to how the dbuf eviction | |
602 | * code is laid out; dbuf_evict_thread() assumes dbufs are evenly | |
603 | * distributed between all sublists and uses this assumption when | |
604 | * deciding which sublist to evict from and how much to evict from it. | |
605 | */ | |
606 | unsigned int | |
607 | dbuf_cache_multilist_index_func(multilist_t *ml, void *obj) | |
34dc7c2f | 608 | { |
d3c2ae1c GW |
609 | dmu_buf_impl_t *db = obj; |
610 | ||
611 | /* | |
612 | * The assumption here, is the hash value for a given | |
613 | * dmu_buf_impl_t will remain constant throughout it's lifetime | |
614 | * (i.e. it's objset, object, level and blkid fields don't change). | |
615 | * Thus, we don't need to store the dbuf's sublist index | |
616 | * on insertion, as this index can be recalculated on removal. | |
617 | * | |
618 | * Also, the low order bits of the hash value are thought to be | |
619 | * distributed evenly. Otherwise, in the case that the multilist | |
620 | * has a power of two number of sublists, each sublists' usage | |
621 | * would not be evenly distributed. | |
622 | */ | |
623 | return (dbuf_hash(db->db_objset, db->db.db_object, | |
624 | db->db_level, db->db_blkid) % | |
625 | multilist_get_num_sublists(ml)); | |
626 | } | |
627 | ||
e71cade6 | 628 | static inline unsigned long |
629 | dbuf_cache_target_bytes(void) | |
630 | { | |
631 | return MIN(dbuf_cache_max_bytes, | |
de4f8d5d | 632 | arc_target_bytes() >> dbuf_cache_shift); |
e71cade6 | 633 | } |
634 | ||
5e021f56 GDN |
635 | static inline uint64_t |
636 | dbuf_cache_hiwater_bytes(void) | |
d3c2ae1c | 637 | { |
e71cade6 | 638 | uint64_t dbuf_cache_target = dbuf_cache_target_bytes(); |
5e021f56 GDN |
639 | return (dbuf_cache_target + |
640 | (dbuf_cache_target * dbuf_cache_hiwater_pct) / 100); | |
641 | } | |
e71cade6 | 642 | |
5e021f56 GDN |
643 | static inline uint64_t |
644 | dbuf_cache_lowater_bytes(void) | |
645 | { | |
646 | uint64_t dbuf_cache_target = dbuf_cache_target_bytes(); | |
647 | return (dbuf_cache_target - | |
648 | (dbuf_cache_target * dbuf_cache_lowater_pct) / 100); | |
649 | } | |
d3c2ae1c | 650 | |
5e021f56 GDN |
651 | static inline boolean_t |
652 | dbuf_cache_above_hiwater(void) | |
653 | { | |
424fd7c3 | 654 | return (zfs_refcount_count(&dbuf_caches[DB_DBUF_CACHE].size) > |
2e5dc449 | 655 | dbuf_cache_hiwater_bytes()); |
d3c2ae1c GW |
656 | } |
657 | ||
658 | static inline boolean_t | |
659 | dbuf_cache_above_lowater(void) | |
660 | { | |
424fd7c3 | 661 | return (zfs_refcount_count(&dbuf_caches[DB_DBUF_CACHE].size) > |
2e5dc449 | 662 | dbuf_cache_lowater_bytes()); |
d3c2ae1c GW |
663 | } |
664 | ||
665 | /* | |
666 | * Evict the oldest eligible dbuf from the dbuf cache. | |
667 | */ | |
668 | static void | |
669 | dbuf_evict_one(void) | |
670 | { | |
2e5dc449 MA |
671 | int idx = multilist_get_random_index(dbuf_caches[DB_DBUF_CACHE].cache); |
672 | multilist_sublist_t *mls = multilist_sublist_lock( | |
673 | dbuf_caches[DB_DBUF_CACHE].cache, idx); | |
1c27024e | 674 | |
d3c2ae1c GW |
675 | ASSERT(!MUTEX_HELD(&dbuf_evict_lock)); |
676 | ||
1c27024e | 677 | dmu_buf_impl_t *db = multilist_sublist_tail(mls); |
d3c2ae1c GW |
678 | while (db != NULL && mutex_tryenter(&db->db_mtx) == 0) { |
679 | db = multilist_sublist_prev(mls, db); | |
680 | } | |
681 | ||
682 | DTRACE_PROBE2(dbuf__evict__one, dmu_buf_impl_t *, db, | |
683 | multilist_sublist_t *, mls); | |
684 | ||
685 | if (db != NULL) { | |
686 | multilist_sublist_remove(mls, db); | |
687 | multilist_sublist_unlock(mls); | |
424fd7c3 TS |
688 | (void) zfs_refcount_remove_many( |
689 | &dbuf_caches[DB_DBUF_CACHE].size, db->db.db_size, db); | |
5e021f56 GDN |
690 | DBUF_STAT_BUMPDOWN(cache_levels[db->db_level]); |
691 | DBUF_STAT_BUMPDOWN(cache_count); | |
692 | DBUF_STAT_DECR(cache_levels_bytes[db->db_level], | |
693 | db->db.db_size); | |
2e5dc449 MA |
694 | ASSERT3U(db->db_caching_status, ==, DB_DBUF_CACHE); |
695 | db->db_caching_status = DB_NO_CACHE; | |
d3c2ae1c | 696 | dbuf_destroy(db); |
5e021f56 | 697 | DBUF_STAT_MAX(cache_size_bytes_max, |
424fd7c3 | 698 | zfs_refcount_count(&dbuf_caches[DB_DBUF_CACHE].size)); |
5e021f56 | 699 | DBUF_STAT_BUMP(cache_total_evicts); |
d3c2ae1c GW |
700 | } else { |
701 | multilist_sublist_unlock(mls); | |
702 | } | |
d3c2ae1c GW |
703 | } |
704 | ||
705 | /* | |
706 | * The dbuf evict thread is responsible for aging out dbufs from the | |
707 | * cache. Once the cache has reached it's maximum size, dbufs are removed | |
708 | * and destroyed. The eviction thread will continue running until the size | |
709 | * of the dbuf cache is at or below the maximum size. Once the dbuf is aged | |
710 | * out of the cache it is destroyed and becomes eligible for arc eviction. | |
711 | */ | |
867959b5 | 712 | /* ARGSUSED */ |
d3c2ae1c | 713 | static void |
c25b8f99 | 714 | dbuf_evict_thread(void *unused) |
d3c2ae1c GW |
715 | { |
716 | callb_cpr_t cpr; | |
717 | ||
718 | CALLB_CPR_INIT(&cpr, &dbuf_evict_lock, callb_generic_cpr, FTAG); | |
719 | ||
720 | mutex_enter(&dbuf_evict_lock); | |
721 | while (!dbuf_evict_thread_exit) { | |
722 | while (!dbuf_cache_above_lowater() && !dbuf_evict_thread_exit) { | |
723 | CALLB_CPR_SAFE_BEGIN(&cpr); | |
724 | (void) cv_timedwait_sig_hires(&dbuf_evict_cv, | |
725 | &dbuf_evict_lock, SEC2NSEC(1), MSEC2NSEC(1), 0); | |
726 | CALLB_CPR_SAFE_END(&cpr, &dbuf_evict_lock); | |
727 | } | |
728 | mutex_exit(&dbuf_evict_lock); | |
729 | ||
730 | /* | |
731 | * Keep evicting as long as we're above the low water mark | |
732 | * for the cache. We do this without holding the locks to | |
733 | * minimize lock contention. | |
734 | */ | |
735 | while (dbuf_cache_above_lowater() && !dbuf_evict_thread_exit) { | |
736 | dbuf_evict_one(); | |
737 | } | |
738 | ||
739 | mutex_enter(&dbuf_evict_lock); | |
740 | } | |
741 | ||
742 | dbuf_evict_thread_exit = B_FALSE; | |
743 | cv_broadcast(&dbuf_evict_cv); | |
744 | CALLB_CPR_EXIT(&cpr); /* drops dbuf_evict_lock */ | |
745 | thread_exit(); | |
746 | } | |
747 | ||
748 | /* | |
749 | * Wake up the dbuf eviction thread if the dbuf cache is at its max size. | |
750 | * If the dbuf cache is at its high water mark, then evict a dbuf from the | |
751 | * dbuf cache using the callers context. | |
752 | */ | |
753 | static void | |
754 | dbuf_evict_notify(void) | |
755 | { | |
38240ebd MA |
756 | /* |
757 | * We check if we should evict without holding the dbuf_evict_lock, | |
758 | * because it's OK to occasionally make the wrong decision here, | |
759 | * and grabbing the lock results in massive lock contention. | |
760 | */ | |
424fd7c3 | 761 | if (zfs_refcount_count(&dbuf_caches[DB_DBUF_CACHE].size) > |
2e5dc449 | 762 | dbuf_cache_target_bytes()) { |
38240ebd | 763 | if (dbuf_cache_above_hiwater()) |
d3c2ae1c | 764 | dbuf_evict_one(); |
38240ebd | 765 | cv_signal(&dbuf_evict_cv); |
d3c2ae1c | 766 | } |
34dc7c2f BB |
767 | } |
768 | ||
5e021f56 GDN |
769 | static int |
770 | dbuf_kstat_update(kstat_t *ksp, int rw) | |
771 | { | |
772 | dbuf_stats_t *ds = ksp->ks_data; | |
d3c2ae1c | 773 | |
5e021f56 GDN |
774 | if (rw == KSTAT_WRITE) { |
775 | return (SET_ERROR(EACCES)); | |
776 | } else { | |
424fd7c3 TS |
777 | ds->metadata_cache_size_bytes.value.ui64 = zfs_refcount_count( |
778 | &dbuf_caches[DB_DBUF_METADATA_CACHE].size); | |
5e021f56 | 779 | ds->cache_size_bytes.value.ui64 = |
424fd7c3 | 780 | zfs_refcount_count(&dbuf_caches[DB_DBUF_CACHE].size); |
5e021f56 GDN |
781 | ds->cache_target_bytes.value.ui64 = dbuf_cache_target_bytes(); |
782 | ds->cache_hiwater_bytes.value.ui64 = dbuf_cache_hiwater_bytes(); | |
783 | ds->cache_lowater_bytes.value.ui64 = dbuf_cache_lowater_bytes(); | |
784 | ds->hash_elements.value.ui64 = dbuf_hash_count; | |
785 | } | |
786 | ||
787 | return (0); | |
788 | } | |
d3c2ae1c | 789 | |
34dc7c2f BB |
790 | void |
791 | dbuf_init(void) | |
792 | { | |
793 | uint64_t hsize = 1ULL << 16; | |
794 | dbuf_hash_table_t *h = &dbuf_hash_table; | |
795 | int i; | |
796 | ||
797 | /* | |
798 | * The hash table is big enough to fill all of physical memory | |
69de3421 TC |
799 | * with an average block size of zfs_arc_average_blocksize (default 8K). |
800 | * By default, the table will take up | |
801 | * totalmem * sizeof(void*) / 8K (1MB per GB with 8-byte pointers). | |
34dc7c2f | 802 | */ |
69de3421 | 803 | while (hsize * zfs_arc_average_blocksize < physmem * PAGESIZE) |
34dc7c2f BB |
804 | hsize <<= 1; |
805 | ||
806 | retry: | |
807 | h->hash_table_mask = hsize - 1; | |
93ce2b4c | 808 | #if defined(_KERNEL) |
d1d7e268 MK |
809 | /* |
810 | * Large allocations which do not require contiguous pages | |
811 | * should be using vmem_alloc() in the linux kernel | |
812 | */ | |
79c76d5b | 813 | h->hash_table = vmem_zalloc(hsize * sizeof (void *), KM_SLEEP); |
00b46022 | 814 | #else |
34dc7c2f | 815 | h->hash_table = kmem_zalloc(hsize * sizeof (void *), KM_NOSLEEP); |
00b46022 | 816 | #endif |
34dc7c2f BB |
817 | if (h->hash_table == NULL) { |
818 | /* XXX - we should really return an error instead of assert */ | |
819 | ASSERT(hsize > (1ULL << 10)); | |
820 | hsize >>= 1; | |
821 | goto retry; | |
822 | } | |
823 | ||
d3c2ae1c | 824 | dbuf_kmem_cache = kmem_cache_create("dmu_buf_impl_t", |
34dc7c2f BB |
825 | sizeof (dmu_buf_impl_t), |
826 | 0, dbuf_cons, dbuf_dest, NULL, NULL, NULL, 0); | |
827 | ||
828 | for (i = 0; i < DBUF_MUTEXES; i++) | |
40d06e3c | 829 | mutex_init(&h->hash_mutexes[i], NULL, MUTEX_DEFAULT, NULL); |
e0b0ca98 BB |
830 | |
831 | dbuf_stats_init(h); | |
0c66c32d | 832 | |
d3c2ae1c | 833 | /* |
2e5dc449 MA |
834 | * Setup the parameters for the dbuf caches. We set the sizes of the |
835 | * dbuf cache and the metadata cache to 1/32nd and 1/16th (default) | |
836 | * of the target size of the ARC. If the values has been specified as | |
837 | * a module option and they're not greater than the target size of the | |
838 | * ARC, then we honor that value. | |
d3c2ae1c | 839 | */ |
de4f8d5d BB |
840 | if (dbuf_cache_max_bytes == 0 || |
841 | dbuf_cache_max_bytes >= arc_target_bytes()) { | |
842 | dbuf_cache_max_bytes = arc_target_bytes() >> dbuf_cache_shift; | |
843 | } | |
2e5dc449 MA |
844 | if (dbuf_metadata_cache_max_bytes == 0 || |
845 | dbuf_metadata_cache_max_bytes >= arc_target_bytes()) { | |
846 | dbuf_metadata_cache_max_bytes = | |
847 | arc_target_bytes() >> dbuf_metadata_cache_shift; | |
848 | } | |
d3c2ae1c | 849 | |
0c66c32d JG |
850 | /* |
851 | * All entries are queued via taskq_dispatch_ent(), so min/maxalloc | |
852 | * configuration is not required. | |
853 | */ | |
1229323d | 854 | dbu_evict_taskq = taskq_create("dbu_evict", 1, defclsyspri, 0, 0, 0); |
d3c2ae1c | 855 | |
2e5dc449 MA |
856 | for (dbuf_cached_state_t dcs = 0; dcs < DB_CACHE_MAX; dcs++) { |
857 | dbuf_caches[dcs].cache = | |
858 | multilist_create(sizeof (dmu_buf_impl_t), | |
859 | offsetof(dmu_buf_impl_t, db_cache_link), | |
860 | dbuf_cache_multilist_index_func); | |
424fd7c3 | 861 | zfs_refcount_create(&dbuf_caches[dcs].size); |
2e5dc449 | 862 | } |
d3c2ae1c | 863 | |
d3c2ae1c GW |
864 | dbuf_evict_thread_exit = B_FALSE; |
865 | mutex_init(&dbuf_evict_lock, NULL, MUTEX_DEFAULT, NULL); | |
866 | cv_init(&dbuf_evict_cv, NULL, CV_DEFAULT, NULL); | |
867 | dbuf_cache_evict_thread = thread_create(NULL, 0, dbuf_evict_thread, | |
868 | NULL, 0, &p0, TS_RUN, minclsyspri); | |
5e021f56 GDN |
869 | |
870 | dbuf_ksp = kstat_create("zfs", 0, "dbufstats", "misc", | |
871 | KSTAT_TYPE_NAMED, sizeof (dbuf_stats) / sizeof (kstat_named_t), | |
872 | KSTAT_FLAG_VIRTUAL); | |
873 | if (dbuf_ksp != NULL) { | |
874 | dbuf_ksp->ks_data = &dbuf_stats; | |
875 | dbuf_ksp->ks_update = dbuf_kstat_update; | |
876 | kstat_install(dbuf_ksp); | |
877 | ||
878 | for (i = 0; i < DN_MAX_LEVELS; i++) { | |
879 | snprintf(dbuf_stats.cache_levels[i].name, | |
880 | KSTAT_STRLEN, "cache_level_%d", i); | |
881 | dbuf_stats.cache_levels[i].data_type = | |
882 | KSTAT_DATA_UINT64; | |
883 | snprintf(dbuf_stats.cache_levels_bytes[i].name, | |
884 | KSTAT_STRLEN, "cache_level_%d_bytes", i); | |
885 | dbuf_stats.cache_levels_bytes[i].data_type = | |
886 | KSTAT_DATA_UINT64; | |
887 | } | |
888 | } | |
34dc7c2f BB |
889 | } |
890 | ||
891 | void | |
892 | dbuf_fini(void) | |
893 | { | |
894 | dbuf_hash_table_t *h = &dbuf_hash_table; | |
895 | int i; | |
896 | ||
e0b0ca98 BB |
897 | dbuf_stats_destroy(); |
898 | ||
34dc7c2f BB |
899 | for (i = 0; i < DBUF_MUTEXES; i++) |
900 | mutex_destroy(&h->hash_mutexes[i]); | |
93ce2b4c | 901 | #if defined(_KERNEL) |
d1d7e268 MK |
902 | /* |
903 | * Large allocations which do not require contiguous pages | |
904 | * should be using vmem_free() in the linux kernel | |
905 | */ | |
00b46022 BB |
906 | vmem_free(h->hash_table, (h->hash_table_mask + 1) * sizeof (void *)); |
907 | #else | |
34dc7c2f | 908 | kmem_free(h->hash_table, (h->hash_table_mask + 1) * sizeof (void *)); |
00b46022 | 909 | #endif |
d3c2ae1c | 910 | kmem_cache_destroy(dbuf_kmem_cache); |
0c66c32d | 911 | taskq_destroy(dbu_evict_taskq); |
d3c2ae1c GW |
912 | |
913 | mutex_enter(&dbuf_evict_lock); | |
914 | dbuf_evict_thread_exit = B_TRUE; | |
915 | while (dbuf_evict_thread_exit) { | |
916 | cv_signal(&dbuf_evict_cv); | |
917 | cv_wait(&dbuf_evict_cv, &dbuf_evict_lock); | |
918 | } | |
919 | mutex_exit(&dbuf_evict_lock); | |
d3c2ae1c GW |
920 | |
921 | mutex_destroy(&dbuf_evict_lock); | |
922 | cv_destroy(&dbuf_evict_cv); | |
923 | ||
2e5dc449 | 924 | for (dbuf_cached_state_t dcs = 0; dcs < DB_CACHE_MAX; dcs++) { |
424fd7c3 | 925 | zfs_refcount_destroy(&dbuf_caches[dcs].size); |
2e5dc449 MA |
926 | multilist_destroy(dbuf_caches[dcs].cache); |
927 | } | |
5e021f56 GDN |
928 | |
929 | if (dbuf_ksp != NULL) { | |
930 | kstat_delete(dbuf_ksp); | |
931 | dbuf_ksp = NULL; | |
932 | } | |
34dc7c2f BB |
933 | } |
934 | ||
935 | /* | |
936 | * Other stuff. | |
937 | */ | |
938 | ||
939 | #ifdef ZFS_DEBUG | |
940 | static void | |
941 | dbuf_verify(dmu_buf_impl_t *db) | |
942 | { | |
572e2857 | 943 | dnode_t *dn; |
428870ff | 944 | dbuf_dirty_record_t *dr; |
34dc7c2f BB |
945 | |
946 | ASSERT(MUTEX_HELD(&db->db_mtx)); | |
947 | ||
948 | if (!(zfs_flags & ZFS_DEBUG_DBUF_VERIFY)) | |
949 | return; | |
950 | ||
951 | ASSERT(db->db_objset != NULL); | |
572e2857 BB |
952 | DB_DNODE_ENTER(db); |
953 | dn = DB_DNODE(db); | |
34dc7c2f BB |
954 | if (dn == NULL) { |
955 | ASSERT(db->db_parent == NULL); | |
956 | ASSERT(db->db_blkptr == NULL); | |
957 | } else { | |
958 | ASSERT3U(db->db.db_object, ==, dn->dn_object); | |
959 | ASSERT3P(db->db_objset, ==, dn->dn_objset); | |
960 | ASSERT3U(db->db_level, <, dn->dn_nlevels); | |
572e2857 BB |
961 | ASSERT(db->db_blkid == DMU_BONUS_BLKID || |
962 | db->db_blkid == DMU_SPILL_BLKID || | |
8951cb8d | 963 | !avl_is_empty(&dn->dn_dbufs)); |
34dc7c2f | 964 | } |
428870ff BB |
965 | if (db->db_blkid == DMU_BONUS_BLKID) { |
966 | ASSERT(dn != NULL); | |
967 | ASSERT3U(db->db.db_size, >=, dn->dn_bonuslen); | |
968 | ASSERT3U(db->db.db_offset, ==, DMU_BONUS_BLKID); | |
969 | } else if (db->db_blkid == DMU_SPILL_BLKID) { | |
34dc7c2f | 970 | ASSERT(dn != NULL); |
c99c9001 | 971 | ASSERT0(db->db.db_offset); |
34dc7c2f BB |
972 | } else { |
973 | ASSERT3U(db->db.db_offset, ==, db->db_blkid * db->db.db_size); | |
974 | } | |
975 | ||
428870ff BB |
976 | for (dr = db->db_data_pending; dr != NULL; dr = dr->dr_next) |
977 | ASSERT(dr->dr_dbuf == db); | |
978 | ||
979 | for (dr = db->db_last_dirty; dr != NULL; dr = dr->dr_next) | |
980 | ASSERT(dr->dr_dbuf == db); | |
981 | ||
b128c09f BB |
982 | /* |
983 | * We can't assert that db_size matches dn_datablksz because it | |
984 | * can be momentarily different when another thread is doing | |
985 | * dnode_set_blksz(). | |
986 | */ | |
987 | if (db->db_level == 0 && db->db.db_object == DMU_META_DNODE_OBJECT) { | |
428870ff | 988 | dr = db->db_data_pending; |
b128c09f BB |
989 | /* |
990 | * It should only be modified in syncing context, so | |
991 | * make sure we only have one copy of the data. | |
992 | */ | |
993 | ASSERT(dr == NULL || dr->dt.dl.dr_data == db->db_buf); | |
34dc7c2f BB |
994 | } |
995 | ||
996 | /* verify db->db_blkptr */ | |
997 | if (db->db_blkptr) { | |
998 | if (db->db_parent == dn->dn_dbuf) { | |
999 | /* db is pointed to by the dnode */ | |
1000 | /* ASSERT3U(db->db_blkid, <, dn->dn_nblkptr); */ | |
9babb374 | 1001 | if (DMU_OBJECT_IS_SPECIAL(db->db.db_object)) |
34dc7c2f BB |
1002 | ASSERT(db->db_parent == NULL); |
1003 | else | |
1004 | ASSERT(db->db_parent != NULL); | |
428870ff BB |
1005 | if (db->db_blkid != DMU_SPILL_BLKID) |
1006 | ASSERT3P(db->db_blkptr, ==, | |
1007 | &dn->dn_phys->dn_blkptr[db->db_blkid]); | |
34dc7c2f BB |
1008 | } else { |
1009 | /* db is pointed to by an indirect block */ | |
1fde1e37 | 1010 | ASSERTV(int epb = db->db_parent->db.db_size >> |
02730c33 | 1011 | SPA_BLKPTRSHIFT); |
34dc7c2f BB |
1012 | ASSERT3U(db->db_parent->db_level, ==, db->db_level+1); |
1013 | ASSERT3U(db->db_parent->db.db_object, ==, | |
1014 | db->db.db_object); | |
1015 | /* | |
1016 | * dnode_grow_indblksz() can make this fail if we don't | |
1017 | * have the struct_rwlock. XXX indblksz no longer | |
1018 | * grows. safe to do this now? | |
1019 | */ | |
572e2857 | 1020 | if (RW_WRITE_HELD(&dn->dn_struct_rwlock)) { |
34dc7c2f BB |
1021 | ASSERT3P(db->db_blkptr, ==, |
1022 | ((blkptr_t *)db->db_parent->db.db_data + | |
1023 | db->db_blkid % epb)); | |
1024 | } | |
1025 | } | |
1026 | } | |
1027 | if ((db->db_blkptr == NULL || BP_IS_HOLE(db->db_blkptr)) && | |
428870ff BB |
1028 | (db->db_buf == NULL || db->db_buf->b_data) && |
1029 | db->db.db_data && db->db_blkid != DMU_BONUS_BLKID && | |
34dc7c2f BB |
1030 | db->db_state != DB_FILL && !dn->dn_free_txg) { |
1031 | /* | |
1032 | * If the blkptr isn't set but they have nonzero data, | |
1033 | * it had better be dirty, otherwise we'll lose that | |
1034 | * data when we evict this buffer. | |
bc77ba73 PD |
1035 | * |
1036 | * There is an exception to this rule for indirect blocks; in | |
1037 | * this case, if the indirect block is a hole, we fill in a few | |
1038 | * fields on each of the child blocks (importantly, birth time) | |
1039 | * to prevent hole birth times from being lost when you | |
1040 | * partially fill in a hole. | |
34dc7c2f BB |
1041 | */ |
1042 | if (db->db_dirtycnt == 0) { | |
bc77ba73 PD |
1043 | if (db->db_level == 0) { |
1044 | uint64_t *buf = db->db.db_data; | |
1045 | int i; | |
34dc7c2f | 1046 | |
bc77ba73 PD |
1047 | for (i = 0; i < db->db.db_size >> 3; i++) { |
1048 | ASSERT(buf[i] == 0); | |
1049 | } | |
1050 | } else { | |
bc77ba73 PD |
1051 | blkptr_t *bps = db->db.db_data; |
1052 | ASSERT3U(1 << DB_DNODE(db)->dn_indblkshift, ==, | |
1053 | db->db.db_size); | |
1054 | /* | |
1055 | * We want to verify that all the blkptrs in the | |
1056 | * indirect block are holes, but we may have | |
1057 | * automatically set up a few fields for them. | |
1058 | * We iterate through each blkptr and verify | |
1059 | * they only have those fields set. | |
1060 | */ | |
1c27024e | 1061 | for (int i = 0; |
bc77ba73 PD |
1062 | i < db->db.db_size / sizeof (blkptr_t); |
1063 | i++) { | |
1064 | blkptr_t *bp = &bps[i]; | |
1065 | ASSERT(ZIO_CHECKSUM_IS_ZERO( | |
1066 | &bp->blk_cksum)); | |
1067 | ASSERT( | |
1068 | DVA_IS_EMPTY(&bp->blk_dva[0]) && | |
1069 | DVA_IS_EMPTY(&bp->blk_dva[1]) && | |
1070 | DVA_IS_EMPTY(&bp->blk_dva[2])); | |
1071 | ASSERT0(bp->blk_fill); | |
1072 | ASSERT0(bp->blk_pad[0]); | |
1073 | ASSERT0(bp->blk_pad[1]); | |
1074 | ASSERT(!BP_IS_EMBEDDED(bp)); | |
1075 | ASSERT(BP_IS_HOLE(bp)); | |
1076 | ASSERT0(bp->blk_phys_birth); | |
1077 | } | |
34dc7c2f BB |
1078 | } |
1079 | } | |
1080 | } | |
572e2857 | 1081 | DB_DNODE_EXIT(db); |
34dc7c2f BB |
1082 | } |
1083 | #endif | |
1084 | ||
0c66c32d JG |
1085 | static void |
1086 | dbuf_clear_data(dmu_buf_impl_t *db) | |
1087 | { | |
1088 | ASSERT(MUTEX_HELD(&db->db_mtx)); | |
1089 | dbuf_evict_user(db); | |
d3c2ae1c | 1090 | ASSERT3P(db->db_buf, ==, NULL); |
0c66c32d JG |
1091 | db->db.db_data = NULL; |
1092 | if (db->db_state != DB_NOFILL) | |
1093 | db->db_state = DB_UNCACHED; | |
1094 | } | |
1095 | ||
34dc7c2f BB |
1096 | static void |
1097 | dbuf_set_data(dmu_buf_impl_t *db, arc_buf_t *buf) | |
1098 | { | |
1099 | ASSERT(MUTEX_HELD(&db->db_mtx)); | |
0c66c32d JG |
1100 | ASSERT(buf != NULL); |
1101 | ||
34dc7c2f | 1102 | db->db_buf = buf; |
0c66c32d JG |
1103 | ASSERT(buf->b_data != NULL); |
1104 | db->db.db_data = buf->b_data; | |
34dc7c2f BB |
1105 | } |
1106 | ||
428870ff BB |
1107 | /* |
1108 | * Loan out an arc_buf for read. Return the loaned arc_buf. | |
1109 | */ | |
1110 | arc_buf_t * | |
1111 | dbuf_loan_arcbuf(dmu_buf_impl_t *db) | |
1112 | { | |
1113 | arc_buf_t *abuf; | |
1114 | ||
d3c2ae1c | 1115 | ASSERT(db->db_blkid != DMU_BONUS_BLKID); |
428870ff | 1116 | mutex_enter(&db->db_mtx); |
424fd7c3 | 1117 | if (arc_released(db->db_buf) || zfs_refcount_count(&db->db_holds) > 1) { |
428870ff | 1118 | int blksz = db->db.db_size; |
b0bc7a84 | 1119 | spa_t *spa = db->db_objset->os_spa; |
572e2857 | 1120 | |
428870ff | 1121 | mutex_exit(&db->db_mtx); |
2aa34383 | 1122 | abuf = arc_loan_buf(spa, B_FALSE, blksz); |
428870ff BB |
1123 | bcopy(db->db.db_data, abuf->b_data, blksz); |
1124 | } else { | |
1125 | abuf = db->db_buf; | |
1126 | arc_loan_inuse_buf(abuf, db); | |
d3c2ae1c | 1127 | db->db_buf = NULL; |
0c66c32d | 1128 | dbuf_clear_data(db); |
428870ff BB |
1129 | mutex_exit(&db->db_mtx); |
1130 | } | |
1131 | return (abuf); | |
1132 | } | |
1133 | ||
fcff0f35 PD |
1134 | /* |
1135 | * Calculate which level n block references the data at the level 0 offset | |
1136 | * provided. | |
1137 | */ | |
34dc7c2f | 1138 | uint64_t |
031d7c2f | 1139 | dbuf_whichblock(const dnode_t *dn, const int64_t level, const uint64_t offset) |
34dc7c2f | 1140 | { |
fcff0f35 PD |
1141 | if (dn->dn_datablkshift != 0 && dn->dn_indblkshift != 0) { |
1142 | /* | |
1143 | * The level n blkid is equal to the level 0 blkid divided by | |
1144 | * the number of level 0s in a level n block. | |
1145 | * | |
1146 | * The level 0 blkid is offset >> datablkshift = | |
1147 | * offset / 2^datablkshift. | |
1148 | * | |
1149 | * The number of level 0s in a level n is the number of block | |
1150 | * pointers in an indirect block, raised to the power of level. | |
1151 | * This is 2^(indblkshift - SPA_BLKPTRSHIFT)^level = | |
1152 | * 2^(level*(indblkshift - SPA_BLKPTRSHIFT)). | |
1153 | * | |
1154 | * Thus, the level n blkid is: offset / | |
fe8a7982 | 1155 | * ((2^datablkshift)*(2^(level*(indblkshift-SPA_BLKPTRSHIFT)))) |
fcff0f35 PD |
1156 | * = offset / 2^(datablkshift + level * |
1157 | * (indblkshift - SPA_BLKPTRSHIFT)) | |
1158 | * = offset >> (datablkshift + level * | |
1159 | * (indblkshift - SPA_BLKPTRSHIFT)) | |
1160 | */ | |
031d7c2f GN |
1161 | |
1162 | const unsigned exp = dn->dn_datablkshift + | |
1163 | level * (dn->dn_indblkshift - SPA_BLKPTRSHIFT); | |
1164 | ||
1165 | if (exp >= 8 * sizeof (offset)) { | |
1166 | /* This only happens on the highest indirection level */ | |
1167 | ASSERT3U(level, ==, dn->dn_nlevels - 1); | |
1168 | return (0); | |
1169 | } | |
1170 | ||
1171 | ASSERT3U(exp, <, 8 * sizeof (offset)); | |
1172 | ||
1173 | return (offset >> exp); | |
34dc7c2f BB |
1174 | } else { |
1175 | ASSERT3U(offset, <, dn->dn_datablksz); | |
1176 | return (0); | |
1177 | } | |
1178 | } | |
1179 | ||
1180 | static void | |
d4a72f23 TC |
1181 | dbuf_read_done(zio_t *zio, const zbookmark_phys_t *zb, const blkptr_t *bp, |
1182 | arc_buf_t *buf, void *vdb) | |
34dc7c2f BB |
1183 | { |
1184 | dmu_buf_impl_t *db = vdb; | |
1185 | ||
1186 | mutex_enter(&db->db_mtx); | |
1187 | ASSERT3U(db->db_state, ==, DB_READ); | |
1188 | /* | |
1189 | * All reads are synchronous, so we must have a hold on the dbuf | |
1190 | */ | |
424fd7c3 | 1191 | ASSERT(zfs_refcount_count(&db->db_holds) > 0); |
34dc7c2f BB |
1192 | ASSERT(db->db_buf == NULL); |
1193 | ASSERT(db->db.db_data == NULL); | |
c3bd3fb4 TC |
1194 | if (buf == NULL) { |
1195 | /* i/o error */ | |
1196 | ASSERT(zio == NULL || zio->io_error != 0); | |
1197 | ASSERT(db->db_blkid != DMU_BONUS_BLKID); | |
1198 | ASSERT3P(db->db_buf, ==, NULL); | |
1199 | db->db_state = DB_UNCACHED; | |
1200 | } else if (db->db_level == 0 && db->db_freed_in_flight) { | |
1201 | /* freed in flight */ | |
1202 | ASSERT(zio == NULL || zio->io_error == 0); | |
34dc7c2f BB |
1203 | arc_release(buf, db); |
1204 | bzero(buf->b_data, db->db.db_size); | |
1205 | arc_buf_freeze(buf); | |
1206 | db->db_freed_in_flight = FALSE; | |
1207 | dbuf_set_data(db, buf); | |
1208 | db->db_state = DB_CACHED; | |
c3bd3fb4 TC |
1209 | } else { |
1210 | /* success */ | |
1211 | ASSERT(zio == NULL || zio->io_error == 0); | |
34dc7c2f BB |
1212 | dbuf_set_data(db, buf); |
1213 | db->db_state = DB_CACHED; | |
34dc7c2f BB |
1214 | } |
1215 | cv_broadcast(&db->db_changed); | |
3d503a76 | 1216 | dbuf_rele_and_unlock(db, NULL, B_FALSE); |
34dc7c2f BB |
1217 | } |
1218 | ||
69830602 TC |
1219 | |
1220 | /* | |
1221 | * This function ensures that, when doing a decrypting read of a block, | |
1222 | * we make sure we have decrypted the dnode associated with it. We must do | |
1223 | * this so that we ensure we are fully authenticating the checksum-of-MACs | |
1224 | * tree from the root of the objset down to this block. Indirect blocks are | |
1225 | * always verified against their secure checksum-of-MACs assuming that the | |
1226 | * dnode containing them is correct. Now that we are doing a decrypting read, | |
1227 | * we can be sure that the key is loaded and verify that assumption. This is | |
1228 | * especially important considering that we always read encrypted dnode | |
1229 | * blocks as raw data (without verifying their MACs) to start, and | |
1230 | * decrypt / authenticate them when we need to read an encrypted bonus buffer. | |
1231 | */ | |
1232 | static int | |
1233 | dbuf_read_verify_dnode_crypt(dmu_buf_impl_t *db, uint32_t flags) | |
1234 | { | |
1235 | int err = 0; | |
1236 | objset_t *os = db->db_objset; | |
1237 | arc_buf_t *dnode_abuf; | |
1238 | dnode_t *dn; | |
1239 | zbookmark_phys_t zb; | |
1240 | ||
1241 | ASSERT(MUTEX_HELD(&db->db_mtx)); | |
1242 | ||
1243 | if (!os->os_encrypted || os->os_raw_receive || | |
1244 | (flags & DB_RF_NO_DECRYPT) != 0) | |
1245 | return (0); | |
1246 | ||
1247 | DB_DNODE_ENTER(db); | |
1248 | dn = DB_DNODE(db); | |
1249 | dnode_abuf = (dn->dn_dbuf != NULL) ? dn->dn_dbuf->db_buf : NULL; | |
1250 | ||
1251 | if (dnode_abuf == NULL || !arc_is_encrypted(dnode_abuf)) { | |
1252 | DB_DNODE_EXIT(db); | |
1253 | return (0); | |
1254 | } | |
1255 | ||
1256 | SET_BOOKMARK(&zb, dmu_objset_id(os), | |
1257 | DMU_META_DNODE_OBJECT, 0, dn->dn_dbuf->db_blkid); | |
1258 | err = arc_untransform(dnode_abuf, os->os_spa, &zb, B_TRUE); | |
1259 | ||
1260 | /* | |
1261 | * An error code of EACCES tells us that the key is still not | |
1262 | * available. This is ok if we are only reading authenticated | |
1263 | * (and therefore non-encrypted) blocks. | |
1264 | */ | |
1265 | if (err == EACCES && ((db->db_blkid != DMU_BONUS_BLKID && | |
1266 | !DMU_OT_IS_ENCRYPTED(dn->dn_type)) || | |
1267 | (db->db_blkid == DMU_BONUS_BLKID && | |
1268 | !DMU_OT_IS_ENCRYPTED(dn->dn_bonustype)))) | |
1269 | err = 0; | |
1270 | ||
69830602 TC |
1271 | DB_DNODE_EXIT(db); |
1272 | ||
1273 | return (err); | |
1274 | } | |
1275 | ||
5f6d0b6f | 1276 | static int |
7f60329a | 1277 | dbuf_read_impl(dmu_buf_impl_t *db, zio_t *zio, uint32_t flags) |
34dc7c2f | 1278 | { |
572e2857 | 1279 | dnode_t *dn; |
5dbd68a3 | 1280 | zbookmark_phys_t zb; |
2a432414 | 1281 | uint32_t aflags = ARC_FLAG_NOWAIT; |
b5256303 | 1282 | int err, zio_flags = 0; |
34dc7c2f | 1283 | |
572e2857 BB |
1284 | DB_DNODE_ENTER(db); |
1285 | dn = DB_DNODE(db); | |
424fd7c3 | 1286 | ASSERT(!zfs_refcount_is_zero(&db->db_holds)); |
34dc7c2f | 1287 | /* We need the struct_rwlock to prevent db_blkptr from changing. */ |
b128c09f | 1288 | ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); |
34dc7c2f BB |
1289 | ASSERT(MUTEX_HELD(&db->db_mtx)); |
1290 | ASSERT(db->db_state == DB_UNCACHED); | |
1291 | ASSERT(db->db_buf == NULL); | |
1292 | ||
428870ff | 1293 | if (db->db_blkid == DMU_BONUS_BLKID) { |
50c957f7 NB |
1294 | /* |
1295 | * The bonus length stored in the dnode may be less than | |
1296 | * the maximum available space in the bonus buffer. | |
1297 | */ | |
9babb374 | 1298 | int bonuslen = MIN(dn->dn_bonuslen, dn->dn_phys->dn_bonuslen); |
50c957f7 | 1299 | int max_bonuslen = DN_SLOTS_TO_BONUSLEN(dn->dn_num_slots); |
b5256303 TC |
1300 | |
1301 | /* if the underlying dnode block is encrypted, decrypt it */ | |
69830602 TC |
1302 | err = dbuf_read_verify_dnode_crypt(db, flags); |
1303 | if (err != 0) { | |
1304 | DB_DNODE_EXIT(db); | |
1305 | mutex_exit(&db->db_mtx); | |
1306 | return (err); | |
b5256303 | 1307 | } |
34dc7c2f BB |
1308 | |
1309 | ASSERT3U(bonuslen, <=, db->db.db_size); | |
a3fd9d9e | 1310 | db->db.db_data = kmem_alloc(max_bonuslen, KM_SLEEP); |
25458cbe | 1311 | arc_space_consume(max_bonuslen, ARC_SPACE_BONUS); |
50c957f7 NB |
1312 | if (bonuslen < max_bonuslen) |
1313 | bzero(db->db.db_data, max_bonuslen); | |
9babb374 BB |
1314 | if (bonuslen) |
1315 | bcopy(DN_BONUS(dn->dn_phys), db->db.db_data, bonuslen); | |
572e2857 | 1316 | DB_DNODE_EXIT(db); |
34dc7c2f BB |
1317 | db->db_state = DB_CACHED; |
1318 | mutex_exit(&db->db_mtx); | |
5f6d0b6f | 1319 | return (0); |
34dc7c2f BB |
1320 | } |
1321 | ||
b128c09f BB |
1322 | /* |
1323 | * Recheck BP_IS_HOLE() after dnode_block_freed() in case dnode_sync() | |
1324 | * processes the delete record and clears the bp while we are waiting | |
1325 | * for the dn_mtx (resulting in a "no" from block_freed). | |
1326 | */ | |
1327 | if (db->db_blkptr == NULL || BP_IS_HOLE(db->db_blkptr) || | |
1328 | (db->db_level == 0 && (dnode_block_freed(dn, db->db_blkid) || | |
1329 | BP_IS_HOLE(db->db_blkptr)))) { | |
34dc7c2f BB |
1330 | arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); |
1331 | ||
2aa34383 DK |
1332 | dbuf_set_data(db, arc_alloc_buf(db->db_objset->os_spa, db, type, |
1333 | db->db.db_size)); | |
34dc7c2f | 1334 | bzero(db->db.db_data, db->db.db_size); |
bc77ba73 PD |
1335 | |
1336 | if (db->db_blkptr != NULL && db->db_level > 0 && | |
1337 | BP_IS_HOLE(db->db_blkptr) && | |
1338 | db->db_blkptr->blk_birth != 0) { | |
1339 | blkptr_t *bps = db->db.db_data; | |
1c27024e | 1340 | for (int i = 0; i < ((1 << |
bc77ba73 PD |
1341 | DB_DNODE(db)->dn_indblkshift) / sizeof (blkptr_t)); |
1342 | i++) { | |
1343 | blkptr_t *bp = &bps[i]; | |
1344 | ASSERT3U(BP_GET_LSIZE(db->db_blkptr), ==, | |
1345 | 1 << dn->dn_indblkshift); | |
1346 | BP_SET_LSIZE(bp, | |
1347 | BP_GET_LEVEL(db->db_blkptr) == 1 ? | |
1348 | dn->dn_datablksz : | |
1349 | BP_GET_LSIZE(db->db_blkptr)); | |
1350 | BP_SET_TYPE(bp, BP_GET_TYPE(db->db_blkptr)); | |
1351 | BP_SET_LEVEL(bp, | |
1352 | BP_GET_LEVEL(db->db_blkptr) - 1); | |
1353 | BP_SET_BIRTH(bp, db->db_blkptr->blk_birth, 0); | |
1354 | } | |
1355 | } | |
1356 | DB_DNODE_EXIT(db); | |
34dc7c2f | 1357 | db->db_state = DB_CACHED; |
34dc7c2f | 1358 | mutex_exit(&db->db_mtx); |
5f6d0b6f | 1359 | return (0); |
34dc7c2f BB |
1360 | } |
1361 | ||
370bbf66 TC |
1362 | |
1363 | SET_BOOKMARK(&zb, dmu_objset_id(db->db_objset), | |
1364 | db->db.db_object, db->db_level, db->db_blkid); | |
1365 | ||
b5256303 TC |
1366 | /* |
1367 | * All bps of an encrypted os should have the encryption bit set. | |
1368 | * If this is not true it indicates tampering and we report an error. | |
1369 | */ | |
1370 | if (db->db_objset->os_encrypted && !BP_USES_CRYPT(db->db_blkptr)) { | |
1371 | spa_log_error(db->db_objset->os_spa, &zb); | |
1372 | zfs_panic_recover("unencrypted block in encrypted " | |
1373 | "object set %llu", dmu_objset_id(db->db_objset)); | |
69830602 TC |
1374 | DB_DNODE_EXIT(db); |
1375 | mutex_exit(&db->db_mtx); | |
b5256303 TC |
1376 | return (SET_ERROR(EIO)); |
1377 | } | |
1378 | ||
69830602 TC |
1379 | err = dbuf_read_verify_dnode_crypt(db, flags); |
1380 | if (err != 0) { | |
1381 | DB_DNODE_EXIT(db); | |
1382 | mutex_exit(&db->db_mtx); | |
1383 | return (err); | |
1384 | } | |
1385 | ||
1386 | DB_DNODE_EXIT(db); | |
1387 | ||
1388 | db->db_state = DB_READ; | |
1389 | mutex_exit(&db->db_mtx); | |
1390 | ||
1391 | if (DBUF_IS_L2CACHEABLE(db)) | |
1392 | aflags |= ARC_FLAG_L2CACHE; | |
1393 | ||
34dc7c2f | 1394 | dbuf_add_ref(db, NULL); |
b128c09f | 1395 | |
b5256303 TC |
1396 | zio_flags = (flags & DB_RF_CANFAIL) ? |
1397 | ZIO_FLAG_CANFAIL : ZIO_FLAG_MUSTSUCCEED; | |
1398 | ||
1399 | if ((flags & DB_RF_NO_DECRYPT) && BP_IS_PROTECTED(db->db_blkptr)) | |
1400 | zio_flags |= ZIO_FLAG_RAW; | |
1401 | ||
5f6d0b6f | 1402 | err = arc_read(zio, db->db_objset->os_spa, db->db_blkptr, |
b5256303 | 1403 | dbuf_read_done, db, ZIO_PRIORITY_SYNC_READ, zio_flags, |
34dc7c2f | 1404 | &aflags, &zb); |
5f6d0b6f | 1405 | |
da8d5748 | 1406 | return (err); |
34dc7c2f BB |
1407 | } |
1408 | ||
2aa34383 DK |
1409 | /* |
1410 | * This is our just-in-time copy function. It makes a copy of buffers that | |
1411 | * have been modified in a previous transaction group before we access them in | |
1412 | * the current active group. | |
1413 | * | |
1414 | * This function is used in three places: when we are dirtying a buffer for the | |
1415 | * first time in a txg, when we are freeing a range in a dnode that includes | |
1416 | * this buffer, and when we are accessing a buffer which was received compressed | |
1417 | * and later referenced in a WRITE_BYREF record. | |
1418 | * | |
1419 | * Note that when we are called from dbuf_free_range() we do not put a hold on | |
1420 | * the buffer, we just traverse the active dbuf list for the dnode. | |
1421 | */ | |
1422 | static void | |
1423 | dbuf_fix_old_data(dmu_buf_impl_t *db, uint64_t txg) | |
1424 | { | |
1425 | dbuf_dirty_record_t *dr = db->db_last_dirty; | |
1426 | ||
1427 | ASSERT(MUTEX_HELD(&db->db_mtx)); | |
1428 | ASSERT(db->db.db_data != NULL); | |
1429 | ASSERT(db->db_level == 0); | |
1430 | ASSERT(db->db.db_object != DMU_META_DNODE_OBJECT); | |
1431 | ||
1432 | if (dr == NULL || | |
1433 | (dr->dt.dl.dr_data != | |
1434 | ((db->db_blkid == DMU_BONUS_BLKID) ? db->db.db_data : db->db_buf))) | |
1435 | return; | |
1436 | ||
1437 | /* | |
1438 | * If the last dirty record for this dbuf has not yet synced | |
1439 | * and its referencing the dbuf data, either: | |
1440 | * reset the reference to point to a new copy, | |
1441 | * or (if there a no active holders) | |
1442 | * just null out the current db_data pointer. | |
1443 | */ | |
4807c0ba | 1444 | ASSERT3U(dr->dr_txg, >=, txg - 2); |
2aa34383 | 1445 | if (db->db_blkid == DMU_BONUS_BLKID) { |
2aa34383 DK |
1446 | dnode_t *dn = DB_DNODE(db); |
1447 | int bonuslen = DN_SLOTS_TO_BONUSLEN(dn->dn_num_slots); | |
a3fd9d9e | 1448 | dr->dt.dl.dr_data = kmem_alloc(bonuslen, KM_SLEEP); |
2aa34383 DK |
1449 | arc_space_consume(bonuslen, ARC_SPACE_BONUS); |
1450 | bcopy(db->db.db_data, dr->dt.dl.dr_data, bonuslen); | |
424fd7c3 | 1451 | } else if (zfs_refcount_count(&db->db_holds) > db->db_dirtycnt) { |
b5256303 | 1452 | dnode_t *dn = DB_DNODE(db); |
2aa34383 DK |
1453 | int size = arc_buf_size(db->db_buf); |
1454 | arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); | |
1455 | spa_t *spa = db->db_objset->os_spa; | |
1456 | enum zio_compress compress_type = | |
1457 | arc_get_compression(db->db_buf); | |
1458 | ||
b5256303 TC |
1459 | if (arc_is_encrypted(db->db_buf)) { |
1460 | boolean_t byteorder; | |
1461 | uint8_t salt[ZIO_DATA_SALT_LEN]; | |
1462 | uint8_t iv[ZIO_DATA_IV_LEN]; | |
1463 | uint8_t mac[ZIO_DATA_MAC_LEN]; | |
1464 | ||
1465 | arc_get_raw_params(db->db_buf, &byteorder, salt, | |
1466 | iv, mac); | |
1467 | dr->dt.dl.dr_data = arc_alloc_raw_buf(spa, db, | |
1468 | dmu_objset_id(dn->dn_objset), byteorder, salt, iv, | |
1469 | mac, dn->dn_type, size, arc_buf_lsize(db->db_buf), | |
1470 | compress_type); | |
1471 | } else if (compress_type != ZIO_COMPRESS_OFF) { | |
2aa34383 DK |
1472 | ASSERT3U(type, ==, ARC_BUFC_DATA); |
1473 | dr->dt.dl.dr_data = arc_alloc_compressed_buf(spa, db, | |
1474 | size, arc_buf_lsize(db->db_buf), compress_type); | |
b5256303 TC |
1475 | } else { |
1476 | dr->dt.dl.dr_data = arc_alloc_buf(spa, db, type, size); | |
2aa34383 DK |
1477 | } |
1478 | bcopy(db->db.db_data, dr->dt.dl.dr_data->b_data, size); | |
1479 | } else { | |
1480 | db->db_buf = NULL; | |
1481 | dbuf_clear_data(db); | |
1482 | } | |
1483 | } | |
1484 | ||
34dc7c2f BB |
1485 | int |
1486 | dbuf_read(dmu_buf_impl_t *db, zio_t *zio, uint32_t flags) | |
1487 | { | |
1488 | int err = 0; | |
b0bc7a84 | 1489 | boolean_t prefetch; |
572e2857 | 1490 | dnode_t *dn; |
34dc7c2f BB |
1491 | |
1492 | /* | |
1493 | * We don't have to hold the mutex to check db_state because it | |
1494 | * can't be freed while we have a hold on the buffer. | |
1495 | */ | |
424fd7c3 | 1496 | ASSERT(!zfs_refcount_is_zero(&db->db_holds)); |
34dc7c2f | 1497 | |
b128c09f | 1498 | if (db->db_state == DB_NOFILL) |
2e528b49 | 1499 | return (SET_ERROR(EIO)); |
b128c09f | 1500 | |
572e2857 BB |
1501 | DB_DNODE_ENTER(db); |
1502 | dn = DB_DNODE(db); | |
34dc7c2f | 1503 | if ((flags & DB_RF_HAVESTRUCT) == 0) |
572e2857 | 1504 | rw_enter(&dn->dn_struct_rwlock, RW_READER); |
34dc7c2f | 1505 | |
428870ff | 1506 | prefetch = db->db_level == 0 && db->db_blkid != DMU_BONUS_BLKID && |
572e2857 | 1507 | (flags & DB_RF_NOPREFETCH) == 0 && dn != NULL && |
b128c09f | 1508 | DBUF_IS_CACHEABLE(db); |
34dc7c2f BB |
1509 | |
1510 | mutex_enter(&db->db_mtx); | |
1511 | if (db->db_state == DB_CACHED) { | |
b5256303 TC |
1512 | spa_t *spa = dn->dn_objset->os_spa; |
1513 | ||
2aa34383 | 1514 | /* |
69830602 TC |
1515 | * Ensure that this block's dnode has been decrypted if |
1516 | * the caller has requested decrypted data. | |
2aa34383 | 1517 | */ |
69830602 TC |
1518 | err = dbuf_read_verify_dnode_crypt(db, flags); |
1519 | ||
1520 | /* | |
1521 | * If the arc buf is compressed or encrypted and the caller | |
1522 | * requested uncompressed data, we need to untransform it | |
1523 | * before returning. We also call arc_untransform() on any | |
1524 | * unauthenticated blocks, which will verify their MAC if | |
1525 | * the key is now available. | |
1526 | */ | |
1527 | if (err == 0 && db->db_buf != NULL && | |
1528 | (flags & DB_RF_NO_DECRYPT) == 0 && | |
b5256303 | 1529 | (arc_is_encrypted(db->db_buf) || |
69830602 | 1530 | arc_is_unauthenticated(db->db_buf) || |
b5256303 | 1531 | arc_get_compression(db->db_buf) != ZIO_COMPRESS_OFF)) { |
a2c2ed1b TC |
1532 | zbookmark_phys_t zb; |
1533 | ||
1534 | SET_BOOKMARK(&zb, dmu_objset_id(db->db_objset), | |
1535 | db->db.db_object, db->db_level, db->db_blkid); | |
b5256303 | 1536 | dbuf_fix_old_data(db, spa_syncing_txg(spa)); |
a2c2ed1b | 1537 | err = arc_untransform(db->db_buf, spa, &zb, B_FALSE); |
2aa34383 DK |
1538 | dbuf_set_data(db, db->db_buf); |
1539 | } | |
34dc7c2f | 1540 | mutex_exit(&db->db_mtx); |
69830602 | 1541 | if (err == 0 && prefetch) |
755065f3 | 1542 | dmu_zfetch(&dn->dn_zfetch, db->db_blkid, 1, B_TRUE); |
34dc7c2f | 1543 | if ((flags & DB_RF_HAVESTRUCT) == 0) |
572e2857 BB |
1544 | rw_exit(&dn->dn_struct_rwlock); |
1545 | DB_DNODE_EXIT(db); | |
5e021f56 | 1546 | DBUF_STAT_BUMP(hash_hits); |
34dc7c2f | 1547 | } else if (db->db_state == DB_UNCACHED) { |
572e2857 | 1548 | spa_t *spa = dn->dn_objset->os_spa; |
a0043383 | 1549 | boolean_t need_wait = B_FALSE; |
572e2857 | 1550 | |
b0319c1f | 1551 | if (zio == NULL && |
a0043383 | 1552 | db->db_blkptr != NULL && !BP_IS_HOLE(db->db_blkptr)) { |
572e2857 | 1553 | zio = zio_root(spa, NULL, NULL, ZIO_FLAG_CANFAIL); |
a0043383 MA |
1554 | need_wait = B_TRUE; |
1555 | } | |
7f60329a | 1556 | err = dbuf_read_impl(db, zio, flags); |
34dc7c2f BB |
1557 | |
1558 | /* dbuf_read_impl has dropped db_mtx for us */ | |
1559 | ||
5f6d0b6f | 1560 | if (!err && prefetch) |
755065f3 | 1561 | dmu_zfetch(&dn->dn_zfetch, db->db_blkid, 1, B_TRUE); |
34dc7c2f BB |
1562 | |
1563 | if ((flags & DB_RF_HAVESTRUCT) == 0) | |
572e2857 BB |
1564 | rw_exit(&dn->dn_struct_rwlock); |
1565 | DB_DNODE_EXIT(db); | |
5e021f56 | 1566 | DBUF_STAT_BUMP(hash_misses); |
34dc7c2f | 1567 | |
5e7f3ace TC |
1568 | /* |
1569 | * If we created a zio_root we must execute it to avoid | |
1570 | * leaking it, even if it isn't attached to any work due | |
1571 | * to an error in dbuf_read_impl(). | |
1572 | */ | |
1573 | if (need_wait) { | |
1574 | if (err == 0) | |
1575 | err = zio_wait(zio); | |
1576 | else | |
1577 | VERIFY0(zio_wait(zio)); | |
1578 | } | |
34dc7c2f | 1579 | } else { |
e49f1e20 WA |
1580 | /* |
1581 | * Another reader came in while the dbuf was in flight | |
1582 | * between UNCACHED and CACHED. Either a writer will finish | |
1583 | * writing the buffer (sending the dbuf to CACHED) or the | |
1584 | * first reader's request will reach the read_done callback | |
1585 | * and send the dbuf to CACHED. Otherwise, a failure | |
1586 | * occurred and the dbuf went to UNCACHED. | |
1587 | */ | |
34dc7c2f BB |
1588 | mutex_exit(&db->db_mtx); |
1589 | if (prefetch) | |
755065f3 | 1590 | dmu_zfetch(&dn->dn_zfetch, db->db_blkid, 1, B_TRUE); |
34dc7c2f | 1591 | if ((flags & DB_RF_HAVESTRUCT) == 0) |
572e2857 BB |
1592 | rw_exit(&dn->dn_struct_rwlock); |
1593 | DB_DNODE_EXIT(db); | |
5e021f56 | 1594 | DBUF_STAT_BUMP(hash_misses); |
34dc7c2f | 1595 | |
e49f1e20 | 1596 | /* Skip the wait per the caller's request. */ |
34dc7c2f BB |
1597 | mutex_enter(&db->db_mtx); |
1598 | if ((flags & DB_RF_NEVERWAIT) == 0) { | |
1599 | while (db->db_state == DB_READ || | |
1600 | db->db_state == DB_FILL) { | |
1601 | ASSERT(db->db_state == DB_READ || | |
1602 | (flags & DB_RF_HAVESTRUCT) == 0); | |
64dbba36 AL |
1603 | DTRACE_PROBE2(blocked__read, dmu_buf_impl_t *, |
1604 | db, zio_t *, zio); | |
34dc7c2f BB |
1605 | cv_wait(&db->db_changed, &db->db_mtx); |
1606 | } | |
1607 | if (db->db_state == DB_UNCACHED) | |
2e528b49 | 1608 | err = SET_ERROR(EIO); |
34dc7c2f BB |
1609 | } |
1610 | mutex_exit(&db->db_mtx); | |
1611 | } | |
1612 | ||
34dc7c2f BB |
1613 | return (err); |
1614 | } | |
1615 | ||
1616 | static void | |
1617 | dbuf_noread(dmu_buf_impl_t *db) | |
1618 | { | |
424fd7c3 | 1619 | ASSERT(!zfs_refcount_is_zero(&db->db_holds)); |
428870ff | 1620 | ASSERT(db->db_blkid != DMU_BONUS_BLKID); |
34dc7c2f BB |
1621 | mutex_enter(&db->db_mtx); |
1622 | while (db->db_state == DB_READ || db->db_state == DB_FILL) | |
1623 | cv_wait(&db->db_changed, &db->db_mtx); | |
1624 | if (db->db_state == DB_UNCACHED) { | |
1625 | arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); | |
b0bc7a84 | 1626 | spa_t *spa = db->db_objset->os_spa; |
34dc7c2f BB |
1627 | |
1628 | ASSERT(db->db_buf == NULL); | |
1629 | ASSERT(db->db.db_data == NULL); | |
2aa34383 | 1630 | dbuf_set_data(db, arc_alloc_buf(spa, db, type, db->db.db_size)); |
34dc7c2f | 1631 | db->db_state = DB_FILL; |
b128c09f | 1632 | } else if (db->db_state == DB_NOFILL) { |
0c66c32d | 1633 | dbuf_clear_data(db); |
34dc7c2f BB |
1634 | } else { |
1635 | ASSERT3U(db->db_state, ==, DB_CACHED); | |
1636 | } | |
1637 | mutex_exit(&db->db_mtx); | |
1638 | } | |
1639 | ||
34dc7c2f BB |
1640 | void |
1641 | dbuf_unoverride(dbuf_dirty_record_t *dr) | |
1642 | { | |
1643 | dmu_buf_impl_t *db = dr->dr_dbuf; | |
428870ff | 1644 | blkptr_t *bp = &dr->dt.dl.dr_overridden_by; |
34dc7c2f BB |
1645 | uint64_t txg = dr->dr_txg; |
1646 | ||
1647 | ASSERT(MUTEX_HELD(&db->db_mtx)); | |
00710365 AS |
1648 | /* |
1649 | * This assert is valid because dmu_sync() expects to be called by | |
1650 | * a zilog's get_data while holding a range lock. This call only | |
1651 | * comes from dbuf_dirty() callers who must also hold a range lock. | |
1652 | */ | |
34dc7c2f BB |
1653 | ASSERT(dr->dt.dl.dr_override_state != DR_IN_DMU_SYNC); |
1654 | ASSERT(db->db_level == 0); | |
1655 | ||
428870ff | 1656 | if (db->db_blkid == DMU_BONUS_BLKID || |
34dc7c2f BB |
1657 | dr->dt.dl.dr_override_state == DR_NOT_OVERRIDDEN) |
1658 | return; | |
1659 | ||
428870ff BB |
1660 | ASSERT(db->db_data_pending != dr); |
1661 | ||
34dc7c2f | 1662 | /* free this block */ |
b0bc7a84 MG |
1663 | if (!BP_IS_HOLE(bp) && !dr->dt.dl.dr_nopwrite) |
1664 | zio_free(db->db_objset->os_spa, txg, bp); | |
428870ff | 1665 | |
34dc7c2f | 1666 | dr->dt.dl.dr_override_state = DR_NOT_OVERRIDDEN; |
03c6040b | 1667 | dr->dt.dl.dr_nopwrite = B_FALSE; |
0c03d21a | 1668 | dr->dt.dl.dr_has_raw_params = B_FALSE; |
03c6040b | 1669 | |
34dc7c2f BB |
1670 | /* |
1671 | * Release the already-written buffer, so we leave it in | |
1672 | * a consistent dirty state. Note that all callers are | |
1673 | * modifying the buffer, so they will immediately do | |
1674 | * another (redundant) arc_release(). Therefore, leave | |
1675 | * the buf thawed to save the effort of freezing & | |
1676 | * immediately re-thawing it. | |
1677 | */ | |
1678 | arc_release(dr->dt.dl.dr_data, db); | |
1679 | } | |
1680 | ||
b128c09f BB |
1681 | /* |
1682 | * Evict (if its unreferenced) or clear (if its referenced) any level-0 | |
1683 | * data blocks in the free range, so that any future readers will find | |
b0bc7a84 | 1684 | * empty blocks. |
b128c09f | 1685 | */ |
34dc7c2f | 1686 | void |
8951cb8d AR |
1687 | dbuf_free_range(dnode_t *dn, uint64_t start_blkid, uint64_t end_blkid, |
1688 | dmu_tx_t *tx) | |
34dc7c2f | 1689 | { |
0c66c32d JG |
1690 | dmu_buf_impl_t *db_search; |
1691 | dmu_buf_impl_t *db, *db_next; | |
34dc7c2f | 1692 | uint64_t txg = tx->tx_txg; |
8951cb8d | 1693 | avl_index_t where; |
8951cb8d | 1694 | |
9c9531cb GM |
1695 | if (end_blkid > dn->dn_maxblkid && |
1696 | !(start_blkid == DMU_SPILL_BLKID || end_blkid == DMU_SPILL_BLKID)) | |
8951cb8d AR |
1697 | end_blkid = dn->dn_maxblkid; |
1698 | dprintf_dnode(dn, "start=%llu end=%llu\n", start_blkid, end_blkid); | |
34dc7c2f | 1699 | |
0c66c32d | 1700 | db_search = kmem_alloc(sizeof (dmu_buf_impl_t), KM_SLEEP); |
8951cb8d AR |
1701 | db_search->db_level = 0; |
1702 | db_search->db_blkid = start_blkid; | |
9925c28c | 1703 | db_search->db_state = DB_SEARCH; |
ea97f8ce | 1704 | |
b663a23d | 1705 | mutex_enter(&dn->dn_dbufs_mtx); |
8951cb8d AR |
1706 | db = avl_find(&dn->dn_dbufs, db_search, &where); |
1707 | ASSERT3P(db, ==, NULL); | |
9c9531cb | 1708 | |
8951cb8d AR |
1709 | db = avl_nearest(&dn->dn_dbufs, where, AVL_AFTER); |
1710 | ||
1711 | for (; db != NULL; db = db_next) { | |
1712 | db_next = AVL_NEXT(&dn->dn_dbufs, db); | |
428870ff | 1713 | ASSERT(db->db_blkid != DMU_BONUS_BLKID); |
b128c09f | 1714 | |
8951cb8d AR |
1715 | if (db->db_level != 0 || db->db_blkid > end_blkid) { |
1716 | break; | |
1717 | } | |
1718 | ASSERT3U(db->db_blkid, >=, start_blkid); | |
34dc7c2f BB |
1719 | |
1720 | /* found a level 0 buffer in the range */ | |
13fe0198 MA |
1721 | mutex_enter(&db->db_mtx); |
1722 | if (dbuf_undirty(db, tx)) { | |
1723 | /* mutex has been dropped and dbuf destroyed */ | |
34dc7c2f | 1724 | continue; |
13fe0198 | 1725 | } |
34dc7c2f | 1726 | |
34dc7c2f | 1727 | if (db->db_state == DB_UNCACHED || |
b128c09f | 1728 | db->db_state == DB_NOFILL || |
34dc7c2f BB |
1729 | db->db_state == DB_EVICTING) { |
1730 | ASSERT(db->db.db_data == NULL); | |
1731 | mutex_exit(&db->db_mtx); | |
1732 | continue; | |
1733 | } | |
1734 | if (db->db_state == DB_READ || db->db_state == DB_FILL) { | |
1735 | /* will be handled in dbuf_read_done or dbuf_rele */ | |
1736 | db->db_freed_in_flight = TRUE; | |
1737 | mutex_exit(&db->db_mtx); | |
1738 | continue; | |
1739 | } | |
424fd7c3 | 1740 | if (zfs_refcount_count(&db->db_holds) == 0) { |
34dc7c2f | 1741 | ASSERT(db->db_buf); |
d3c2ae1c | 1742 | dbuf_destroy(db); |
34dc7c2f BB |
1743 | continue; |
1744 | } | |
1745 | /* The dbuf is referenced */ | |
1746 | ||
1747 | if (db->db_last_dirty != NULL) { | |
1748 | dbuf_dirty_record_t *dr = db->db_last_dirty; | |
1749 | ||
1750 | if (dr->dr_txg == txg) { | |
1751 | /* | |
1752 | * This buffer is "in-use", re-adjust the file | |
1753 | * size to reflect that this buffer may | |
1754 | * contain new data when we sync. | |
1755 | */ | |
428870ff BB |
1756 | if (db->db_blkid != DMU_SPILL_BLKID && |
1757 | db->db_blkid > dn->dn_maxblkid) | |
34dc7c2f BB |
1758 | dn->dn_maxblkid = db->db_blkid; |
1759 | dbuf_unoverride(dr); | |
1760 | } else { | |
1761 | /* | |
1762 | * This dbuf is not dirty in the open context. | |
1763 | * Either uncache it (if its not referenced in | |
1764 | * the open context) or reset its contents to | |
1765 | * empty. | |
1766 | */ | |
1767 | dbuf_fix_old_data(db, txg); | |
1768 | } | |
1769 | } | |
1770 | /* clear the contents if its cached */ | |
1771 | if (db->db_state == DB_CACHED) { | |
1772 | ASSERT(db->db.db_data != NULL); | |
1773 | arc_release(db->db_buf, db); | |
1774 | bzero(db->db.db_data, db->db.db_size); | |
1775 | arc_buf_freeze(db->db_buf); | |
1776 | } | |
1777 | ||
1778 | mutex_exit(&db->db_mtx); | |
1779 | } | |
8951cb8d | 1780 | |
8951cb8d | 1781 | kmem_free(db_search, sizeof (dmu_buf_impl_t)); |
34dc7c2f BB |
1782 | mutex_exit(&dn->dn_dbufs_mtx); |
1783 | } | |
1784 | ||
34dc7c2f BB |
1785 | void |
1786 | dbuf_new_size(dmu_buf_impl_t *db, int size, dmu_tx_t *tx) | |
1787 | { | |
1788 | arc_buf_t *buf, *obuf; | |
1789 | int osize = db->db.db_size; | |
1790 | arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); | |
572e2857 | 1791 | dnode_t *dn; |
34dc7c2f | 1792 | |
428870ff | 1793 | ASSERT(db->db_blkid != DMU_BONUS_BLKID); |
34dc7c2f | 1794 | |
572e2857 BB |
1795 | DB_DNODE_ENTER(db); |
1796 | dn = DB_DNODE(db); | |
1797 | ||
34dc7c2f | 1798 | /* XXX does *this* func really need the lock? */ |
572e2857 | 1799 | ASSERT(RW_WRITE_HELD(&dn->dn_struct_rwlock)); |
34dc7c2f BB |
1800 | |
1801 | /* | |
b0bc7a84 | 1802 | * This call to dmu_buf_will_dirty() with the dn_struct_rwlock held |
34dc7c2f BB |
1803 | * is OK, because there can be no other references to the db |
1804 | * when we are changing its size, so no concurrent DB_FILL can | |
1805 | * be happening. | |
1806 | */ | |
1807 | /* | |
1808 | * XXX we should be doing a dbuf_read, checking the return | |
1809 | * value and returning that up to our callers | |
1810 | */ | |
b0bc7a84 | 1811 | dmu_buf_will_dirty(&db->db, tx); |
34dc7c2f BB |
1812 | |
1813 | /* create the data buffer for the new block */ | |
2aa34383 | 1814 | buf = arc_alloc_buf(dn->dn_objset->os_spa, db, type, size); |
34dc7c2f BB |
1815 | |
1816 | /* copy old block data to the new block */ | |
1817 | obuf = db->db_buf; | |
1818 | bcopy(obuf->b_data, buf->b_data, MIN(osize, size)); | |
1819 | /* zero the remainder */ | |
1820 | if (size > osize) | |
1821 | bzero((uint8_t *)buf->b_data + osize, size - osize); | |
1822 | ||
1823 | mutex_enter(&db->db_mtx); | |
1824 | dbuf_set_data(db, buf); | |
d3c2ae1c | 1825 | arc_buf_destroy(obuf, db); |
34dc7c2f BB |
1826 | db->db.db_size = size; |
1827 | ||
1828 | if (db->db_level == 0) { | |
1829 | ASSERT3U(db->db_last_dirty->dr_txg, ==, tx->tx_txg); | |
1830 | db->db_last_dirty->dt.dl.dr_data = buf; | |
1831 | } | |
1832 | mutex_exit(&db->db_mtx); | |
1833 | ||
3ec3bc21 | 1834 | dmu_objset_willuse_space(dn->dn_objset, size - osize, tx); |
572e2857 | 1835 | DB_DNODE_EXIT(db); |
34dc7c2f BB |
1836 | } |
1837 | ||
428870ff BB |
1838 | void |
1839 | dbuf_release_bp(dmu_buf_impl_t *db) | |
1840 | { | |
b0bc7a84 | 1841 | ASSERTV(objset_t *os = db->db_objset); |
428870ff BB |
1842 | |
1843 | ASSERT(dsl_pool_sync_context(dmu_objset_pool(os))); | |
1844 | ASSERT(arc_released(os->os_phys_buf) || | |
1845 | list_link_active(&os->os_dsl_dataset->ds_synced_link)); | |
1846 | ASSERT(db->db_parent == NULL || arc_released(db->db_parent->db_buf)); | |
1847 | ||
294f6806 | 1848 | (void) arc_release(db->db_buf, db); |
428870ff BB |
1849 | } |
1850 | ||
5a28a973 MA |
1851 | /* |
1852 | * We already have a dirty record for this TXG, and we are being | |
1853 | * dirtied again. | |
1854 | */ | |
1855 | static void | |
1856 | dbuf_redirty(dbuf_dirty_record_t *dr) | |
1857 | { | |
1858 | dmu_buf_impl_t *db = dr->dr_dbuf; | |
1859 | ||
1860 | ASSERT(MUTEX_HELD(&db->db_mtx)); | |
1861 | ||
1862 | if (db->db_level == 0 && db->db_blkid != DMU_BONUS_BLKID) { | |
1863 | /* | |
1864 | * If this buffer has already been written out, | |
1865 | * we now need to reset its state. | |
1866 | */ | |
1867 | dbuf_unoverride(dr); | |
1868 | if (db->db.db_object != DMU_META_DNODE_OBJECT && | |
1869 | db->db_state != DB_NOFILL) { | |
1870 | /* Already released on initial dirty, so just thaw. */ | |
1871 | ASSERT(arc_released(db->db_buf)); | |
1872 | arc_buf_thaw(db->db_buf); | |
1873 | } | |
1874 | } | |
1875 | } | |
1876 | ||
34dc7c2f BB |
1877 | dbuf_dirty_record_t * |
1878 | dbuf_dirty(dmu_buf_impl_t *db, dmu_tx_t *tx) | |
1879 | { | |
572e2857 BB |
1880 | dnode_t *dn; |
1881 | objset_t *os; | |
34dc7c2f BB |
1882 | dbuf_dirty_record_t **drp, *dr; |
1883 | int drop_struct_lock = FALSE; | |
1884 | int txgoff = tx->tx_txg & TXG_MASK; | |
1885 | ||
1886 | ASSERT(tx->tx_txg != 0); | |
424fd7c3 | 1887 | ASSERT(!zfs_refcount_is_zero(&db->db_holds)); |
34dc7c2f BB |
1888 | DMU_TX_DIRTY_BUF(tx, db); |
1889 | ||
572e2857 BB |
1890 | DB_DNODE_ENTER(db); |
1891 | dn = DB_DNODE(db); | |
34dc7c2f BB |
1892 | /* |
1893 | * Shouldn't dirty a regular buffer in syncing context. Private | |
1894 | * objects may be dirtied in syncing context, but only if they | |
1895 | * were already pre-dirtied in open context. | |
34dc7c2f | 1896 | */ |
cc9bb3e5 GM |
1897 | #ifdef DEBUG |
1898 | if (dn->dn_objset->os_dsl_dataset != NULL) { | |
1899 | rrw_enter(&dn->dn_objset->os_dsl_dataset->ds_bp_rwlock, | |
1900 | RW_READER, FTAG); | |
1901 | } | |
34dc7c2f BB |
1902 | ASSERT(!dmu_tx_is_syncing(tx) || |
1903 | BP_IS_HOLE(dn->dn_objset->os_rootbp) || | |
9babb374 BB |
1904 | DMU_OBJECT_IS_SPECIAL(dn->dn_object) || |
1905 | dn->dn_objset->os_dsl_dataset == NULL); | |
cc9bb3e5 GM |
1906 | if (dn->dn_objset->os_dsl_dataset != NULL) |
1907 | rrw_exit(&dn->dn_objset->os_dsl_dataset->ds_bp_rwlock, FTAG); | |
1908 | #endif | |
34dc7c2f BB |
1909 | /* |
1910 | * We make this assert for private objects as well, but after we | |
1911 | * check if we're already dirty. They are allowed to re-dirty | |
1912 | * in syncing context. | |
1913 | */ | |
1914 | ASSERT(dn->dn_object == DMU_META_DNODE_OBJECT || | |
1915 | dn->dn_dirtyctx == DN_UNDIRTIED || dn->dn_dirtyctx == | |
1916 | (dmu_tx_is_syncing(tx) ? DN_DIRTY_SYNC : DN_DIRTY_OPEN)); | |
1917 | ||
1918 | mutex_enter(&db->db_mtx); | |
1919 | /* | |
1920 | * XXX make this true for indirects too? The problem is that | |
1921 | * transactions created with dmu_tx_create_assigned() from | |
1922 | * syncing context don't bother holding ahead. | |
1923 | */ | |
1924 | ASSERT(db->db_level != 0 || | |
b128c09f BB |
1925 | db->db_state == DB_CACHED || db->db_state == DB_FILL || |
1926 | db->db_state == DB_NOFILL); | |
34dc7c2f BB |
1927 | |
1928 | mutex_enter(&dn->dn_mtx); | |
1929 | /* | |
1930 | * Don't set dirtyctx to SYNC if we're just modifying this as we | |
1931 | * initialize the objset. | |
1932 | */ | |
cc9bb3e5 GM |
1933 | if (dn->dn_dirtyctx == DN_UNDIRTIED) { |
1934 | if (dn->dn_objset->os_dsl_dataset != NULL) { | |
1935 | rrw_enter(&dn->dn_objset->os_dsl_dataset->ds_bp_rwlock, | |
1936 | RW_READER, FTAG); | |
1937 | } | |
1938 | if (!BP_IS_HOLE(dn->dn_objset->os_rootbp)) { | |
1939 | dn->dn_dirtyctx = (dmu_tx_is_syncing(tx) ? | |
1940 | DN_DIRTY_SYNC : DN_DIRTY_OPEN); | |
1941 | ASSERT(dn->dn_dirtyctx_firstset == NULL); | |
1942 | dn->dn_dirtyctx_firstset = kmem_alloc(1, KM_SLEEP); | |
1943 | } | |
1944 | if (dn->dn_objset->os_dsl_dataset != NULL) { | |
1945 | rrw_exit(&dn->dn_objset->os_dsl_dataset->ds_bp_rwlock, | |
1946 | FTAG); | |
1947 | } | |
34dc7c2f | 1948 | } |
edc1e713 TC |
1949 | |
1950 | if (tx->tx_txg > dn->dn_dirty_txg) | |
1951 | dn->dn_dirty_txg = tx->tx_txg; | |
34dc7c2f BB |
1952 | mutex_exit(&dn->dn_mtx); |
1953 | ||
428870ff BB |
1954 | if (db->db_blkid == DMU_SPILL_BLKID) |
1955 | dn->dn_have_spill = B_TRUE; | |
1956 | ||
34dc7c2f BB |
1957 | /* |
1958 | * If this buffer is already dirty, we're done. | |
1959 | */ | |
1960 | drp = &db->db_last_dirty; | |
1961 | ASSERT(*drp == NULL || (*drp)->dr_txg <= tx->tx_txg || | |
1962 | db->db.db_object == DMU_META_DNODE_OBJECT); | |
1963 | while ((dr = *drp) != NULL && dr->dr_txg > tx->tx_txg) | |
1964 | drp = &dr->dr_next; | |
1965 | if (dr && dr->dr_txg == tx->tx_txg) { | |
572e2857 BB |
1966 | DB_DNODE_EXIT(db); |
1967 | ||
5a28a973 | 1968 | dbuf_redirty(dr); |
34dc7c2f BB |
1969 | mutex_exit(&db->db_mtx); |
1970 | return (dr); | |
1971 | } | |
1972 | ||
1973 | /* | |
1974 | * Only valid if not already dirty. | |
1975 | */ | |
9babb374 BB |
1976 | ASSERT(dn->dn_object == 0 || |
1977 | dn->dn_dirtyctx == DN_UNDIRTIED || dn->dn_dirtyctx == | |
34dc7c2f BB |
1978 | (dmu_tx_is_syncing(tx) ? DN_DIRTY_SYNC : DN_DIRTY_OPEN)); |
1979 | ||
1980 | ASSERT3U(dn->dn_nlevels, >, db->db_level); | |
34dc7c2f BB |
1981 | |
1982 | /* | |
1983 | * We should only be dirtying in syncing context if it's the | |
9babb374 BB |
1984 | * mos or we're initializing the os or it's a special object. |
1985 | * However, we are allowed to dirty in syncing context provided | |
1986 | * we already dirtied it in open context. Hence we must make | |
1987 | * this assertion only if we're not already dirty. | |
34dc7c2f | 1988 | */ |
572e2857 | 1989 | os = dn->dn_objset; |
3b7f360c | 1990 | VERIFY3U(tx->tx_txg, <=, spa_final_dirty_txg(os->os_spa)); |
cc9bb3e5 GM |
1991 | #ifdef DEBUG |
1992 | if (dn->dn_objset->os_dsl_dataset != NULL) | |
1993 | rrw_enter(&os->os_dsl_dataset->ds_bp_rwlock, RW_READER, FTAG); | |
9babb374 BB |
1994 | ASSERT(!dmu_tx_is_syncing(tx) || DMU_OBJECT_IS_SPECIAL(dn->dn_object) || |
1995 | os->os_dsl_dataset == NULL || BP_IS_HOLE(os->os_rootbp)); | |
cc9bb3e5 GM |
1996 | if (dn->dn_objset->os_dsl_dataset != NULL) |
1997 | rrw_exit(&os->os_dsl_dataset->ds_bp_rwlock, FTAG); | |
1998 | #endif | |
34dc7c2f BB |
1999 | ASSERT(db->db.db_size != 0); |
2000 | ||
2001 | dprintf_dbuf(db, "size=%llx\n", (u_longlong_t)db->db.db_size); | |
2002 | ||
428870ff | 2003 | if (db->db_blkid != DMU_BONUS_BLKID) { |
3ec3bc21 | 2004 | dmu_objset_willuse_space(os, db->db.db_size, tx); |
34dc7c2f BB |
2005 | } |
2006 | ||
2007 | /* | |
2008 | * If this buffer is dirty in an old transaction group we need | |
2009 | * to make a copy of it so that the changes we make in this | |
2010 | * transaction group won't leak out when we sync the older txg. | |
2011 | */ | |
79c76d5b | 2012 | dr = kmem_zalloc(sizeof (dbuf_dirty_record_t), KM_SLEEP); |
98f72a53 | 2013 | list_link_init(&dr->dr_dirty_node); |
34dc7c2f BB |
2014 | if (db->db_level == 0) { |
2015 | void *data_old = db->db_buf; | |
2016 | ||
b128c09f | 2017 | if (db->db_state != DB_NOFILL) { |
428870ff | 2018 | if (db->db_blkid == DMU_BONUS_BLKID) { |
b128c09f BB |
2019 | dbuf_fix_old_data(db, tx->tx_txg); |
2020 | data_old = db->db.db_data; | |
2021 | } else if (db->db.db_object != DMU_META_DNODE_OBJECT) { | |
2022 | /* | |
2023 | * Release the data buffer from the cache so | |
2024 | * that we can modify it without impacting | |
2025 | * possible other users of this cached data | |
2026 | * block. Note that indirect blocks and | |
2027 | * private objects are not released until the | |
2028 | * syncing state (since they are only modified | |
2029 | * then). | |
2030 | */ | |
2031 | arc_release(db->db_buf, db); | |
2032 | dbuf_fix_old_data(db, tx->tx_txg); | |
2033 | data_old = db->db_buf; | |
2034 | } | |
2035 | ASSERT(data_old != NULL); | |
34dc7c2f | 2036 | } |
34dc7c2f BB |
2037 | dr->dt.dl.dr_data = data_old; |
2038 | } else { | |
448d7aaa | 2039 | mutex_init(&dr->dt.di.dr_mtx, NULL, MUTEX_NOLOCKDEP, NULL); |
34dc7c2f BB |
2040 | list_create(&dr->dt.di.dr_children, |
2041 | sizeof (dbuf_dirty_record_t), | |
2042 | offsetof(dbuf_dirty_record_t, dr_dirty_node)); | |
2043 | } | |
e8b96c60 MA |
2044 | if (db->db_blkid != DMU_BONUS_BLKID && os->os_dsl_dataset != NULL) |
2045 | dr->dr_accounted = db->db.db_size; | |
34dc7c2f BB |
2046 | dr->dr_dbuf = db; |
2047 | dr->dr_txg = tx->tx_txg; | |
2048 | dr->dr_next = *drp; | |
2049 | *drp = dr; | |
2050 | ||
2051 | /* | |
2052 | * We could have been freed_in_flight between the dbuf_noread | |
2053 | * and dbuf_dirty. We win, as though the dbuf_noread() had | |
2054 | * happened after the free. | |
2055 | */ | |
428870ff BB |
2056 | if (db->db_level == 0 && db->db_blkid != DMU_BONUS_BLKID && |
2057 | db->db_blkid != DMU_SPILL_BLKID) { | |
34dc7c2f | 2058 | mutex_enter(&dn->dn_mtx); |
9bd274dd MA |
2059 | if (dn->dn_free_ranges[txgoff] != NULL) { |
2060 | range_tree_clear(dn->dn_free_ranges[txgoff], | |
2061 | db->db_blkid, 1); | |
2062 | } | |
34dc7c2f BB |
2063 | mutex_exit(&dn->dn_mtx); |
2064 | db->db_freed_in_flight = FALSE; | |
2065 | } | |
2066 | ||
2067 | /* | |
2068 | * This buffer is now part of this txg | |
2069 | */ | |
2070 | dbuf_add_ref(db, (void *)(uintptr_t)tx->tx_txg); | |
2071 | db->db_dirtycnt += 1; | |
2072 | ASSERT3U(db->db_dirtycnt, <=, 3); | |
2073 | ||
2074 | mutex_exit(&db->db_mtx); | |
2075 | ||
428870ff BB |
2076 | if (db->db_blkid == DMU_BONUS_BLKID || |
2077 | db->db_blkid == DMU_SPILL_BLKID) { | |
34dc7c2f BB |
2078 | mutex_enter(&dn->dn_mtx); |
2079 | ASSERT(!list_link_active(&dr->dr_dirty_node)); | |
2080 | list_insert_tail(&dn->dn_dirty_records[txgoff], dr); | |
2081 | mutex_exit(&dn->dn_mtx); | |
2082 | dnode_setdirty(dn, tx); | |
572e2857 | 2083 | DB_DNODE_EXIT(db); |
34dc7c2f | 2084 | return (dr); |
98ace739 MA |
2085 | } |
2086 | ||
2087 | /* | |
2088 | * The dn_struct_rwlock prevents db_blkptr from changing | |
2089 | * due to a write from syncing context completing | |
2090 | * while we are running, so we want to acquire it before | |
2091 | * looking at db_blkptr. | |
2092 | */ | |
2093 | if (!RW_WRITE_HELD(&dn->dn_struct_rwlock)) { | |
2094 | rw_enter(&dn->dn_struct_rwlock, RW_READER); | |
2095 | drop_struct_lock = TRUE; | |
2096 | } | |
2097 | ||
2ade4a99 MA |
2098 | /* |
2099 | * We need to hold the dn_struct_rwlock to make this assertion, | |
2100 | * because it protects dn_phys / dn_next_nlevels from changing. | |
2101 | */ | |
2102 | ASSERT((dn->dn_phys->dn_nlevels == 0 && db->db_level == 0) || | |
2103 | dn->dn_phys->dn_nlevels > db->db_level || | |
2104 | dn->dn_next_nlevels[txgoff] > db->db_level || | |
2105 | dn->dn_next_nlevels[(tx->tx_txg-1) & TXG_MASK] > db->db_level || | |
2106 | dn->dn_next_nlevels[(tx->tx_txg-2) & TXG_MASK] > db->db_level); | |
2107 | ||
3ec3bc21 BB |
2108 | /* |
2109 | * If we are overwriting a dedup BP, then unless it is snapshotted, | |
2110 | * when we get to syncing context we will need to decrement its | |
2111 | * refcount in the DDT. Prefetch the relevant DDT block so that | |
2112 | * syncing context won't have to wait for the i/o. | |
2113 | */ | |
2114 | ddt_prefetch(os->os_spa, db->db_blkptr); | |
34dc7c2f | 2115 | |
b128c09f | 2116 | if (db->db_level == 0) { |
69830602 TC |
2117 | ASSERT(!db->db_objset->os_raw_receive || |
2118 | dn->dn_maxblkid >= db->db_blkid); | |
369aa501 TC |
2119 | dnode_new_blkid(dn, db->db_blkid, tx, |
2120 | drop_struct_lock, B_FALSE); | |
b128c09f BB |
2121 | ASSERT(dn->dn_maxblkid >= db->db_blkid); |
2122 | } | |
2123 | ||
34dc7c2f BB |
2124 | if (db->db_level+1 < dn->dn_nlevels) { |
2125 | dmu_buf_impl_t *parent = db->db_parent; | |
2126 | dbuf_dirty_record_t *di; | |
2127 | int parent_held = FALSE; | |
2128 | ||
2129 | if (db->db_parent == NULL || db->db_parent == dn->dn_dbuf) { | |
2130 | int epbs = dn->dn_indblkshift - SPA_BLKPTRSHIFT; | |
2131 | ||
2132 | parent = dbuf_hold_level(dn, db->db_level+1, | |
2133 | db->db_blkid >> epbs, FTAG); | |
428870ff | 2134 | ASSERT(parent != NULL); |
34dc7c2f BB |
2135 | parent_held = TRUE; |
2136 | } | |
2137 | if (drop_struct_lock) | |
2138 | rw_exit(&dn->dn_struct_rwlock); | |
2139 | ASSERT3U(db->db_level+1, ==, parent->db_level); | |
2140 | di = dbuf_dirty(parent, tx); | |
2141 | if (parent_held) | |
2142 | dbuf_rele(parent, FTAG); | |
2143 | ||
2144 | mutex_enter(&db->db_mtx); | |
e8b96c60 MA |
2145 | /* |
2146 | * Since we've dropped the mutex, it's possible that | |
2147 | * dbuf_undirty() might have changed this out from under us. | |
2148 | */ | |
34dc7c2f BB |
2149 | if (db->db_last_dirty == dr || |
2150 | dn->dn_object == DMU_META_DNODE_OBJECT) { | |
2151 | mutex_enter(&di->dt.di.dr_mtx); | |
2152 | ASSERT3U(di->dr_txg, ==, tx->tx_txg); | |
2153 | ASSERT(!list_link_active(&dr->dr_dirty_node)); | |
2154 | list_insert_tail(&di->dt.di.dr_children, dr); | |
2155 | mutex_exit(&di->dt.di.dr_mtx); | |
2156 | dr->dr_parent = di; | |
2157 | } | |
2158 | mutex_exit(&db->db_mtx); | |
2159 | } else { | |
2160 | ASSERT(db->db_level+1 == dn->dn_nlevels); | |
2161 | ASSERT(db->db_blkid < dn->dn_nblkptr); | |
572e2857 | 2162 | ASSERT(db->db_parent == NULL || db->db_parent == dn->dn_dbuf); |
34dc7c2f BB |
2163 | mutex_enter(&dn->dn_mtx); |
2164 | ASSERT(!list_link_active(&dr->dr_dirty_node)); | |
2165 | list_insert_tail(&dn->dn_dirty_records[txgoff], dr); | |
2166 | mutex_exit(&dn->dn_mtx); | |
2167 | if (drop_struct_lock) | |
2168 | rw_exit(&dn->dn_struct_rwlock); | |
2169 | } | |
2170 | ||
2171 | dnode_setdirty(dn, tx); | |
572e2857 | 2172 | DB_DNODE_EXIT(db); |
34dc7c2f BB |
2173 | return (dr); |
2174 | } | |
2175 | ||
13fe0198 | 2176 | /* |
e49f1e20 WA |
2177 | * Undirty a buffer in the transaction group referenced by the given |
2178 | * transaction. Return whether this evicted the dbuf. | |
13fe0198 MA |
2179 | */ |
2180 | static boolean_t | |
34dc7c2f BB |
2181 | dbuf_undirty(dmu_buf_impl_t *db, dmu_tx_t *tx) |
2182 | { | |
572e2857 | 2183 | dnode_t *dn; |
34dc7c2f BB |
2184 | uint64_t txg = tx->tx_txg; |
2185 | dbuf_dirty_record_t *dr, **drp; | |
2186 | ||
2187 | ASSERT(txg != 0); | |
4bda3bd0 MA |
2188 | |
2189 | /* | |
2190 | * Due to our use of dn_nlevels below, this can only be called | |
2191 | * in open context, unless we are operating on the MOS. | |
2192 | * From syncing context, dn_nlevels may be different from the | |
2193 | * dn_nlevels used when dbuf was dirtied. | |
2194 | */ | |
2195 | ASSERT(db->db_objset == | |
2196 | dmu_objset_pool(db->db_objset)->dp_meta_objset || | |
2197 | txg != spa_syncing_txg(dmu_objset_spa(db->db_objset))); | |
428870ff | 2198 | ASSERT(db->db_blkid != DMU_BONUS_BLKID); |
13fe0198 MA |
2199 | ASSERT0(db->db_level); |
2200 | ASSERT(MUTEX_HELD(&db->db_mtx)); | |
34dc7c2f | 2201 | |
34dc7c2f BB |
2202 | /* |
2203 | * If this buffer is not dirty, we're done. | |
2204 | */ | |
2205 | for (drp = &db->db_last_dirty; (dr = *drp) != NULL; drp = &dr->dr_next) | |
2206 | if (dr->dr_txg <= txg) | |
2207 | break; | |
13fe0198 MA |
2208 | if (dr == NULL || dr->dr_txg < txg) |
2209 | return (B_FALSE); | |
34dc7c2f | 2210 | ASSERT(dr->dr_txg == txg); |
428870ff | 2211 | ASSERT(dr->dr_dbuf == db); |
34dc7c2f | 2212 | |
572e2857 BB |
2213 | DB_DNODE_ENTER(db); |
2214 | dn = DB_DNODE(db); | |
2215 | ||
34dc7c2f BB |
2216 | dprintf_dbuf(db, "size=%llx\n", (u_longlong_t)db->db.db_size); |
2217 | ||
2218 | ASSERT(db->db.db_size != 0); | |
2219 | ||
4bda3bd0 MA |
2220 | dsl_pool_undirty_space(dmu_objset_pool(dn->dn_objset), |
2221 | dr->dr_accounted, txg); | |
34dc7c2f BB |
2222 | |
2223 | *drp = dr->dr_next; | |
2224 | ||
ef3c1dea GR |
2225 | /* |
2226 | * Note that there are three places in dbuf_dirty() | |
2227 | * where this dirty record may be put on a list. | |
2228 | * Make sure to do a list_remove corresponding to | |
2229 | * every one of those list_insert calls. | |
2230 | */ | |
34dc7c2f BB |
2231 | if (dr->dr_parent) { |
2232 | mutex_enter(&dr->dr_parent->dt.di.dr_mtx); | |
2233 | list_remove(&dr->dr_parent->dt.di.dr_children, dr); | |
2234 | mutex_exit(&dr->dr_parent->dt.di.dr_mtx); | |
ef3c1dea | 2235 | } else if (db->db_blkid == DMU_SPILL_BLKID || |
4bda3bd0 | 2236 | db->db_level + 1 == dn->dn_nlevels) { |
b128c09f | 2237 | ASSERT(db->db_blkptr == NULL || db->db_parent == dn->dn_dbuf); |
34dc7c2f BB |
2238 | mutex_enter(&dn->dn_mtx); |
2239 | list_remove(&dn->dn_dirty_records[txg & TXG_MASK], dr); | |
2240 | mutex_exit(&dn->dn_mtx); | |
2241 | } | |
572e2857 | 2242 | DB_DNODE_EXIT(db); |
34dc7c2f | 2243 | |
13fe0198 MA |
2244 | if (db->db_state != DB_NOFILL) { |
2245 | dbuf_unoverride(dr); | |
34dc7c2f | 2246 | |
34dc7c2f | 2247 | ASSERT(db->db_buf != NULL); |
13fe0198 MA |
2248 | ASSERT(dr->dt.dl.dr_data != NULL); |
2249 | if (dr->dt.dl.dr_data != db->db_buf) | |
d3c2ae1c | 2250 | arc_buf_destroy(dr->dt.dl.dr_data, db); |
34dc7c2f | 2251 | } |
58c4aa00 | 2252 | |
34dc7c2f BB |
2253 | kmem_free(dr, sizeof (dbuf_dirty_record_t)); |
2254 | ||
2255 | ASSERT(db->db_dirtycnt > 0); | |
2256 | db->db_dirtycnt -= 1; | |
2257 | ||
424fd7c3 | 2258 | if (zfs_refcount_remove(&db->db_holds, (void *)(uintptr_t)txg) == 0) { |
d3c2ae1c GW |
2259 | ASSERT(db->db_state == DB_NOFILL || arc_released(db->db_buf)); |
2260 | dbuf_destroy(db); | |
13fe0198 | 2261 | return (B_TRUE); |
34dc7c2f BB |
2262 | } |
2263 | ||
13fe0198 | 2264 | return (B_FALSE); |
34dc7c2f BB |
2265 | } |
2266 | ||
b5256303 TC |
2267 | static void |
2268 | dmu_buf_will_dirty_impl(dmu_buf_t *db_fake, int flags, dmu_tx_t *tx) | |
34dc7c2f | 2269 | { |
b0bc7a84 | 2270 | dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; |
34dc7c2f BB |
2271 | |
2272 | ASSERT(tx->tx_txg != 0); | |
424fd7c3 | 2273 | ASSERT(!zfs_refcount_is_zero(&db->db_holds)); |
34dc7c2f | 2274 | |
5a28a973 MA |
2275 | /* |
2276 | * Quick check for dirtyness. For already dirty blocks, this | |
2277 | * reduces runtime of this function by >90%, and overall performance | |
2278 | * by 50% for some workloads (e.g. file deletion with indirect blocks | |
2279 | * cached). | |
2280 | */ | |
2281 | mutex_enter(&db->db_mtx); | |
2282 | ||
1c27024e | 2283 | dbuf_dirty_record_t *dr; |
5a28a973 MA |
2284 | for (dr = db->db_last_dirty; |
2285 | dr != NULL && dr->dr_txg >= tx->tx_txg; dr = dr->dr_next) { | |
2286 | /* | |
2287 | * It's possible that it is already dirty but not cached, | |
2288 | * because there are some calls to dbuf_dirty() that don't | |
2289 | * go through dmu_buf_will_dirty(). | |
2290 | */ | |
2291 | if (dr->dr_txg == tx->tx_txg && db->db_state == DB_CACHED) { | |
2292 | /* This dbuf is already dirty and cached. */ | |
2293 | dbuf_redirty(dr); | |
2294 | mutex_exit(&db->db_mtx); | |
2295 | return; | |
2296 | } | |
2297 | } | |
2298 | mutex_exit(&db->db_mtx); | |
2299 | ||
572e2857 BB |
2300 | DB_DNODE_ENTER(db); |
2301 | if (RW_WRITE_HELD(&DB_DNODE(db)->dn_struct_rwlock)) | |
b5256303 | 2302 | flags |= DB_RF_HAVESTRUCT; |
572e2857 | 2303 | DB_DNODE_EXIT(db); |
b5256303 | 2304 | (void) dbuf_read(db, NULL, flags); |
34dc7c2f BB |
2305 | (void) dbuf_dirty(db, tx); |
2306 | } | |
2307 | ||
b5256303 TC |
2308 | void |
2309 | dmu_buf_will_dirty(dmu_buf_t *db_fake, dmu_tx_t *tx) | |
2310 | { | |
2311 | dmu_buf_will_dirty_impl(db_fake, | |
2312 | DB_RF_MUST_SUCCEED | DB_RF_NOPREFETCH, tx); | |
2313 | } | |
2314 | ||
a73e8fdb PZ |
2315 | boolean_t |
2316 | dmu_buf_is_dirty(dmu_buf_t *db_fake, dmu_tx_t *tx) | |
2317 | { | |
2318 | dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; | |
2319 | ||
2320 | mutex_enter(&db->db_mtx); | |
2321 | for (dbuf_dirty_record_t *dr = db->db_last_dirty; | |
2322 | dr != NULL && dr->dr_txg >= tx->tx_txg; dr = dr->dr_next) { | |
2323 | if (dr->dr_txg == tx->tx_txg) { | |
2324 | mutex_exit(&db->db_mtx); | |
2325 | return (B_TRUE); | |
2326 | } | |
2327 | } | |
2328 | mutex_exit(&db->db_mtx); | |
2329 | return (B_FALSE); | |
2330 | } | |
2331 | ||
b128c09f BB |
2332 | void |
2333 | dmu_buf_will_not_fill(dmu_buf_t *db_fake, dmu_tx_t *tx) | |
2334 | { | |
2335 | dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; | |
2336 | ||
2337 | db->db_state = DB_NOFILL; | |
2338 | ||
2339 | dmu_buf_will_fill(db_fake, tx); | |
2340 | } | |
2341 | ||
34dc7c2f BB |
2342 | void |
2343 | dmu_buf_will_fill(dmu_buf_t *db_fake, dmu_tx_t *tx) | |
2344 | { | |
2345 | dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; | |
2346 | ||
428870ff | 2347 | ASSERT(db->db_blkid != DMU_BONUS_BLKID); |
34dc7c2f BB |
2348 | ASSERT(tx->tx_txg != 0); |
2349 | ASSERT(db->db_level == 0); | |
424fd7c3 | 2350 | ASSERT(!zfs_refcount_is_zero(&db->db_holds)); |
34dc7c2f BB |
2351 | |
2352 | ASSERT(db->db.db_object != DMU_META_DNODE_OBJECT || | |
2353 | dmu_tx_private_ok(tx)); | |
2354 | ||
2355 | dbuf_noread(db); | |
2356 | (void) dbuf_dirty(db, tx); | |
2357 | } | |
2358 | ||
b5256303 TC |
2359 | /* |
2360 | * This function is effectively the same as dmu_buf_will_dirty(), but | |
0c03d21a MA |
2361 | * indicates the caller expects raw encrypted data in the db, and provides |
2362 | * the crypt params (byteorder, salt, iv, mac) which should be stored in the | |
2363 | * blkptr_t when this dbuf is written. This is only used for blocks of | |
2364 | * dnodes, during raw receive. | |
b5256303 TC |
2365 | */ |
2366 | void | |
0c03d21a MA |
2367 | dmu_buf_set_crypt_params(dmu_buf_t *db_fake, boolean_t byteorder, |
2368 | const uint8_t *salt, const uint8_t *iv, const uint8_t *mac, dmu_tx_t *tx) | |
b5256303 TC |
2369 | { |
2370 | dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; | |
2371 | dbuf_dirty_record_t *dr; | |
2372 | ||
0c03d21a MA |
2373 | /* |
2374 | * dr_has_raw_params is only processed for blocks of dnodes | |
2375 | * (see dbuf_sync_dnode_leaf_crypt()). | |
2376 | */ | |
2377 | ASSERT3U(db->db.db_object, ==, DMU_META_DNODE_OBJECT); | |
2378 | ASSERT3U(db->db_level, ==, 0); | |
2379 | ASSERT(db->db_objset->os_raw_receive); | |
2380 | ||
b5256303 TC |
2381 | dmu_buf_will_dirty_impl(db_fake, |
2382 | DB_RF_MUST_SUCCEED | DB_RF_NOPREFETCH | DB_RF_NO_DECRYPT, tx); | |
2383 | ||
2384 | dr = db->db_last_dirty; | |
2385 | while (dr != NULL && dr->dr_txg > tx->tx_txg) | |
2386 | dr = dr->dr_next; | |
2387 | ||
2388 | ASSERT3P(dr, !=, NULL); | |
2389 | ASSERT3U(dr->dr_txg, ==, tx->tx_txg); | |
0c03d21a MA |
2390 | |
2391 | dr->dt.dl.dr_has_raw_params = B_TRUE; | |
2392 | dr->dt.dl.dr_byteorder = byteorder; | |
2393 | bcopy(salt, dr->dt.dl.dr_salt, ZIO_DATA_SALT_LEN); | |
2394 | bcopy(iv, dr->dt.dl.dr_iv, ZIO_DATA_IV_LEN); | |
2395 | bcopy(mac, dr->dt.dl.dr_mac, ZIO_DATA_MAC_LEN); | |
b5256303 TC |
2396 | } |
2397 | ||
34dc7c2f BB |
2398 | #pragma weak dmu_buf_fill_done = dbuf_fill_done |
2399 | /* ARGSUSED */ | |
2400 | void | |
2401 | dbuf_fill_done(dmu_buf_impl_t *db, dmu_tx_t *tx) | |
2402 | { | |
2403 | mutex_enter(&db->db_mtx); | |
2404 | DBUF_VERIFY(db); | |
2405 | ||
2406 | if (db->db_state == DB_FILL) { | |
2407 | if (db->db_level == 0 && db->db_freed_in_flight) { | |
428870ff | 2408 | ASSERT(db->db_blkid != DMU_BONUS_BLKID); |
34dc7c2f BB |
2409 | /* we were freed while filling */ |
2410 | /* XXX dbuf_undirty? */ | |
2411 | bzero(db->db.db_data, db->db.db_size); | |
2412 | db->db_freed_in_flight = FALSE; | |
2413 | } | |
2414 | db->db_state = DB_CACHED; | |
2415 | cv_broadcast(&db->db_changed); | |
2416 | } | |
2417 | mutex_exit(&db->db_mtx); | |
2418 | } | |
2419 | ||
9b67f605 MA |
2420 | void |
2421 | dmu_buf_write_embedded(dmu_buf_t *dbuf, void *data, | |
2422 | bp_embedded_type_t etype, enum zio_compress comp, | |
2423 | int uncompressed_size, int compressed_size, int byteorder, | |
2424 | dmu_tx_t *tx) | |
2425 | { | |
2426 | dmu_buf_impl_t *db = (dmu_buf_impl_t *)dbuf; | |
2427 | struct dirty_leaf *dl; | |
2428 | dmu_object_type_t type; | |
2429 | ||
241b5415 MA |
2430 | if (etype == BP_EMBEDDED_TYPE_DATA) { |
2431 | ASSERT(spa_feature_is_active(dmu_objset_spa(db->db_objset), | |
2432 | SPA_FEATURE_EMBEDDED_DATA)); | |
2433 | } | |
2434 | ||
9b67f605 MA |
2435 | DB_DNODE_ENTER(db); |
2436 | type = DB_DNODE(db)->dn_type; | |
2437 | DB_DNODE_EXIT(db); | |
2438 | ||
2439 | ASSERT0(db->db_level); | |
2440 | ASSERT(db->db_blkid != DMU_BONUS_BLKID); | |
2441 | ||
2442 | dmu_buf_will_not_fill(dbuf, tx); | |
2443 | ||
2444 | ASSERT3U(db->db_last_dirty->dr_txg, ==, tx->tx_txg); | |
2445 | dl = &db->db_last_dirty->dt.dl; | |
2446 | encode_embedded_bp_compressed(&dl->dr_overridden_by, | |
2447 | data, comp, uncompressed_size, compressed_size); | |
2448 | BPE_SET_ETYPE(&dl->dr_overridden_by, etype); | |
2449 | BP_SET_TYPE(&dl->dr_overridden_by, type); | |
2450 | BP_SET_LEVEL(&dl->dr_overridden_by, 0); | |
2451 | BP_SET_BYTEORDER(&dl->dr_overridden_by, byteorder); | |
2452 | ||
2453 | dl->dr_override_state = DR_OVERRIDDEN; | |
2454 | dl->dr_overridden_by.blk_birth = db->db_last_dirty->dr_txg; | |
2455 | } | |
2456 | ||
9babb374 BB |
2457 | /* |
2458 | * Directly assign a provided arc buf to a given dbuf if it's not referenced | |
2459 | * by anybody except our caller. Otherwise copy arcbuf's contents to dbuf. | |
2460 | */ | |
2461 | void | |
2462 | dbuf_assign_arcbuf(dmu_buf_impl_t *db, arc_buf_t *buf, dmu_tx_t *tx) | |
2463 | { | |
424fd7c3 | 2464 | ASSERT(!zfs_refcount_is_zero(&db->db_holds)); |
428870ff | 2465 | ASSERT(db->db_blkid != DMU_BONUS_BLKID); |
9babb374 | 2466 | ASSERT(db->db_level == 0); |
2aa34383 | 2467 | ASSERT3U(dbuf_is_metadata(db), ==, arc_is_metadata(buf)); |
9babb374 | 2468 | ASSERT(buf != NULL); |
2aa34383 | 2469 | ASSERT(arc_buf_lsize(buf) == db->db.db_size); |
9babb374 BB |
2470 | ASSERT(tx->tx_txg != 0); |
2471 | ||
2472 | arc_return_buf(buf, db); | |
2473 | ASSERT(arc_released(buf)); | |
2474 | ||
2475 | mutex_enter(&db->db_mtx); | |
2476 | ||
2477 | while (db->db_state == DB_READ || db->db_state == DB_FILL) | |
2478 | cv_wait(&db->db_changed, &db->db_mtx); | |
2479 | ||
2480 | ASSERT(db->db_state == DB_CACHED || db->db_state == DB_UNCACHED); | |
2481 | ||
2482 | if (db->db_state == DB_CACHED && | |
424fd7c3 | 2483 | zfs_refcount_count(&db->db_holds) - 1 > db->db_dirtycnt) { |
440a3eb9 TC |
2484 | /* |
2485 | * In practice, we will never have a case where we have an | |
2486 | * encrypted arc buffer while additional holds exist on the | |
2487 | * dbuf. We don't handle this here so we simply assert that | |
2488 | * fact instead. | |
2489 | */ | |
2490 | ASSERT(!arc_is_encrypted(buf)); | |
9babb374 BB |
2491 | mutex_exit(&db->db_mtx); |
2492 | (void) dbuf_dirty(db, tx); | |
2493 | bcopy(buf->b_data, db->db.db_data, db->db.db_size); | |
d3c2ae1c | 2494 | arc_buf_destroy(buf, db); |
428870ff | 2495 | xuio_stat_wbuf_copied(); |
9babb374 BB |
2496 | return; |
2497 | } | |
2498 | ||
428870ff | 2499 | xuio_stat_wbuf_nocopy(); |
9babb374 BB |
2500 | if (db->db_state == DB_CACHED) { |
2501 | dbuf_dirty_record_t *dr = db->db_last_dirty; | |
2502 | ||
2503 | ASSERT(db->db_buf != NULL); | |
2504 | if (dr != NULL && dr->dr_txg == tx->tx_txg) { | |
2505 | ASSERT(dr->dt.dl.dr_data == db->db_buf); | |
440a3eb9 | 2506 | |
9babb374 BB |
2507 | if (!arc_released(db->db_buf)) { |
2508 | ASSERT(dr->dt.dl.dr_override_state == | |
2509 | DR_OVERRIDDEN); | |
2510 | arc_release(db->db_buf, db); | |
2511 | } | |
2512 | dr->dt.dl.dr_data = buf; | |
d3c2ae1c | 2513 | arc_buf_destroy(db->db_buf, db); |
9babb374 BB |
2514 | } else if (dr == NULL || dr->dt.dl.dr_data != db->db_buf) { |
2515 | arc_release(db->db_buf, db); | |
d3c2ae1c | 2516 | arc_buf_destroy(db->db_buf, db); |
9babb374 BB |
2517 | } |
2518 | db->db_buf = NULL; | |
2519 | } | |
2520 | ASSERT(db->db_buf == NULL); | |
2521 | dbuf_set_data(db, buf); | |
2522 | db->db_state = DB_FILL; | |
2523 | mutex_exit(&db->db_mtx); | |
2524 | (void) dbuf_dirty(db, tx); | |
b0bc7a84 | 2525 | dmu_buf_fill_done(&db->db, tx); |
9babb374 BB |
2526 | } |
2527 | ||
34dc7c2f | 2528 | void |
d3c2ae1c | 2529 | dbuf_destroy(dmu_buf_impl_t *db) |
34dc7c2f | 2530 | { |
572e2857 | 2531 | dnode_t *dn; |
34dc7c2f | 2532 | dmu_buf_impl_t *parent = db->db_parent; |
572e2857 | 2533 | dmu_buf_impl_t *dndb; |
34dc7c2f BB |
2534 | |
2535 | ASSERT(MUTEX_HELD(&db->db_mtx)); | |
424fd7c3 | 2536 | ASSERT(zfs_refcount_is_zero(&db->db_holds)); |
34dc7c2f | 2537 | |
d3c2ae1c GW |
2538 | if (db->db_buf != NULL) { |
2539 | arc_buf_destroy(db->db_buf, db); | |
2540 | db->db_buf = NULL; | |
2541 | } | |
34dc7c2f | 2542 | |
d3c2ae1c GW |
2543 | if (db->db_blkid == DMU_BONUS_BLKID) { |
2544 | int slots = DB_DNODE(db)->dn_num_slots; | |
2545 | int bonuslen = DN_SLOTS_TO_BONUSLEN(slots); | |
b5256303 TC |
2546 | if (db->db.db_data != NULL) { |
2547 | kmem_free(db->db.db_data, bonuslen); | |
2548 | arc_space_return(bonuslen, ARC_SPACE_BONUS); | |
2549 | db->db_state = DB_UNCACHED; | |
2550 | } | |
34dc7c2f BB |
2551 | } |
2552 | ||
d3c2ae1c GW |
2553 | dbuf_clear_data(db); |
2554 | ||
2555 | if (multilist_link_active(&db->db_cache_link)) { | |
2e5dc449 MA |
2556 | ASSERT(db->db_caching_status == DB_DBUF_CACHE || |
2557 | db->db_caching_status == DB_DBUF_METADATA_CACHE); | |
2558 | ||
2559 | multilist_remove(dbuf_caches[db->db_caching_status].cache, db); | |
424fd7c3 | 2560 | (void) zfs_refcount_remove_many( |
2e5dc449 | 2561 | &dbuf_caches[db->db_caching_status].size, |
d3c2ae1c | 2562 | db->db.db_size, db); |
2e5dc449 MA |
2563 | |
2564 | if (db->db_caching_status == DB_DBUF_METADATA_CACHE) { | |
2565 | DBUF_STAT_BUMPDOWN(metadata_cache_count); | |
2566 | } else { | |
2567 | DBUF_STAT_BUMPDOWN(cache_levels[db->db_level]); | |
2568 | DBUF_STAT_BUMPDOWN(cache_count); | |
2569 | DBUF_STAT_DECR(cache_levels_bytes[db->db_level], | |
2570 | db->db.db_size); | |
2571 | } | |
2572 | db->db_caching_status = DB_NO_CACHE; | |
d3c2ae1c GW |
2573 | } |
2574 | ||
b128c09f | 2575 | ASSERT(db->db_state == DB_UNCACHED || db->db_state == DB_NOFILL); |
34dc7c2f BB |
2576 | ASSERT(db->db_data_pending == NULL); |
2577 | ||
2578 | db->db_state = DB_EVICTING; | |
2579 | db->db_blkptr = NULL; | |
2580 | ||
d3c2ae1c GW |
2581 | /* |
2582 | * Now that db_state is DB_EVICTING, nobody else can find this via | |
2583 | * the hash table. We can now drop db_mtx, which allows us to | |
2584 | * acquire the dn_dbufs_mtx. | |
2585 | */ | |
2586 | mutex_exit(&db->db_mtx); | |
2587 | ||
572e2857 BB |
2588 | DB_DNODE_ENTER(db); |
2589 | dn = DB_DNODE(db); | |
2590 | dndb = dn->dn_dbuf; | |
d3c2ae1c GW |
2591 | if (db->db_blkid != DMU_BONUS_BLKID) { |
2592 | boolean_t needlock = !MUTEX_HELD(&dn->dn_dbufs_mtx); | |
2593 | if (needlock) | |
2594 | mutex_enter(&dn->dn_dbufs_mtx); | |
8951cb8d | 2595 | avl_remove(&dn->dn_dbufs, db); |
73ad4a9f | 2596 | atomic_dec_32(&dn->dn_dbufs_count); |
572e2857 BB |
2597 | membar_producer(); |
2598 | DB_DNODE_EXIT(db); | |
d3c2ae1c GW |
2599 | if (needlock) |
2600 | mutex_exit(&dn->dn_dbufs_mtx); | |
572e2857 BB |
2601 | /* |
2602 | * Decrementing the dbuf count means that the hold corresponding | |
2603 | * to the removed dbuf is no longer discounted in dnode_move(), | |
2604 | * so the dnode cannot be moved until after we release the hold. | |
2605 | * The membar_producer() ensures visibility of the decremented | |
2606 | * value in dnode_move(), since DB_DNODE_EXIT doesn't actually | |
2607 | * release any lock. | |
2608 | */ | |
1fac63e5 | 2609 | mutex_enter(&dn->dn_mtx); |
3d503a76 | 2610 | dnode_rele_and_unlock(dn, db, B_TRUE); |
572e2857 | 2611 | db->db_dnode_handle = NULL; |
d3c2ae1c GW |
2612 | |
2613 | dbuf_hash_remove(db); | |
572e2857 BB |
2614 | } else { |
2615 | DB_DNODE_EXIT(db); | |
34dc7c2f BB |
2616 | } |
2617 | ||
424fd7c3 | 2618 | ASSERT(zfs_refcount_is_zero(&db->db_holds)); |
34dc7c2f | 2619 | |
d3c2ae1c GW |
2620 | db->db_parent = NULL; |
2621 | ||
2622 | ASSERT(db->db_buf == NULL); | |
2623 | ASSERT(db->db.db_data == NULL); | |
2624 | ASSERT(db->db_hash_next == NULL); | |
2625 | ASSERT(db->db_blkptr == NULL); | |
2626 | ASSERT(db->db_data_pending == NULL); | |
2e5dc449 | 2627 | ASSERT3U(db->db_caching_status, ==, DB_NO_CACHE); |
d3c2ae1c GW |
2628 | ASSERT(!multilist_link_active(&db->db_cache_link)); |
2629 | ||
2630 | kmem_cache_free(dbuf_kmem_cache, db); | |
2631 | arc_space_return(sizeof (dmu_buf_impl_t), ARC_SPACE_DBUF); | |
34dc7c2f BB |
2632 | |
2633 | /* | |
572e2857 | 2634 | * If this dbuf is referenced from an indirect dbuf, |
34dc7c2f BB |
2635 | * decrement the ref count on the indirect dbuf. |
2636 | */ | |
1fac63e5 MA |
2637 | if (parent && parent != dndb) { |
2638 | mutex_enter(&parent->db_mtx); | |
3d503a76 | 2639 | dbuf_rele_and_unlock(parent, db, B_TRUE); |
1fac63e5 | 2640 | } |
34dc7c2f BB |
2641 | } |
2642 | ||
fcff0f35 PD |
2643 | /* |
2644 | * Note: While bpp will always be updated if the function returns success, | |
2645 | * parentp will not be updated if the dnode does not have dn_dbuf filled in; | |
9c5167d1 | 2646 | * this happens when the dnode is the meta-dnode, or {user|group|project}used |
fcff0f35 PD |
2647 | * object. |
2648 | */ | |
bf701a83 BB |
2649 | __attribute__((always_inline)) |
2650 | static inline int | |
34dc7c2f | 2651 | dbuf_findbp(dnode_t *dn, int level, uint64_t blkid, int fail_sparse, |
adb726eb | 2652 | dmu_buf_impl_t **parentp, blkptr_t **bpp) |
34dc7c2f | 2653 | { |
34dc7c2f BB |
2654 | *parentp = NULL; |
2655 | *bpp = NULL; | |
2656 | ||
428870ff BB |
2657 | ASSERT(blkid != DMU_BONUS_BLKID); |
2658 | ||
2659 | if (blkid == DMU_SPILL_BLKID) { | |
2660 | mutex_enter(&dn->dn_mtx); | |
2661 | if (dn->dn_have_spill && | |
2662 | (dn->dn_phys->dn_flags & DNODE_FLAG_SPILL_BLKPTR)) | |
50c957f7 | 2663 | *bpp = DN_SPILL_BLKPTR(dn->dn_phys); |
428870ff BB |
2664 | else |
2665 | *bpp = NULL; | |
2666 | dbuf_add_ref(dn->dn_dbuf, NULL); | |
2667 | *parentp = dn->dn_dbuf; | |
2668 | mutex_exit(&dn->dn_mtx); | |
2669 | return (0); | |
2670 | } | |
34dc7c2f | 2671 | |
1c27024e | 2672 | int nlevels = |
32d41fb7 | 2673 | (dn->dn_phys->dn_nlevels == 0) ? 1 : dn->dn_phys->dn_nlevels; |
1c27024e | 2674 | int epbs = dn->dn_indblkshift - SPA_BLKPTRSHIFT; |
34dc7c2f BB |
2675 | |
2676 | ASSERT3U(level * epbs, <, 64); | |
2677 | ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); | |
32d41fb7 PD |
2678 | /* |
2679 | * This assertion shouldn't trip as long as the max indirect block size | |
2680 | * is less than 1M. The reason for this is that up to that point, | |
2681 | * the number of levels required to address an entire object with blocks | |
2682 | * of size SPA_MINBLOCKSIZE satisfies nlevels * epbs + 1 <= 64. In | |
2683 | * other words, if N * epbs + 1 > 64, then if (N-1) * epbs + 1 > 55 | |
2684 | * (i.e. we can address the entire object), objects will all use at most | |
2685 | * N-1 levels and the assertion won't overflow. However, once epbs is | |
2686 | * 13, 4 * 13 + 1 = 53, but 5 * 13 + 1 = 66. Then, 4 levels will not be | |
2687 | * enough to address an entire object, so objects will have 5 levels, | |
2688 | * but then this assertion will overflow. | |
2689 | * | |
2690 | * All this is to say that if we ever increase DN_MAX_INDBLKSHIFT, we | |
2691 | * need to redo this logic to handle overflows. | |
2692 | */ | |
2693 | ASSERT(level >= nlevels || | |
2694 | ((nlevels - level - 1) * epbs) + | |
2695 | highbit64(dn->dn_phys->dn_nblkptr) <= 64); | |
34dc7c2f | 2696 | if (level >= nlevels || |
32d41fb7 PD |
2697 | blkid >= ((uint64_t)dn->dn_phys->dn_nblkptr << |
2698 | ((nlevels - level - 1) * epbs)) || | |
2699 | (fail_sparse && | |
2700 | blkid > (dn->dn_phys->dn_maxblkid >> (level * epbs)))) { | |
34dc7c2f | 2701 | /* the buffer has no parent yet */ |
2e528b49 | 2702 | return (SET_ERROR(ENOENT)); |
34dc7c2f BB |
2703 | } else if (level < nlevels-1) { |
2704 | /* this block is referenced from an indirect block */ | |
fc5bb51f | 2705 | int err; |
adb726eb MA |
2706 | dbuf_hold_arg_t *dh = dbuf_hold_arg_create(dn, level + 1, |
2707 | blkid >> epbs, fail_sparse, FALSE, NULL, parentp); | |
2708 | err = dbuf_hold_impl_arg(dh); | |
2709 | dbuf_hold_arg_destroy(dh); | |
34dc7c2f BB |
2710 | if (err) |
2711 | return (err); | |
2712 | err = dbuf_read(*parentp, NULL, | |
2713 | (DB_RF_HAVESTRUCT | DB_RF_NOPREFETCH | DB_RF_CANFAIL)); | |
2714 | if (err) { | |
2715 | dbuf_rele(*parentp, NULL); | |
2716 | *parentp = NULL; | |
2717 | return (err); | |
2718 | } | |
2719 | *bpp = ((blkptr_t *)(*parentp)->db.db_data) + | |
2720 | (blkid & ((1ULL << epbs) - 1)); | |
32d41fb7 PD |
2721 | if (blkid > (dn->dn_phys->dn_maxblkid >> (level * epbs))) |
2722 | ASSERT(BP_IS_HOLE(*bpp)); | |
34dc7c2f BB |
2723 | return (0); |
2724 | } else { | |
2725 | /* the block is referenced from the dnode */ | |
2726 | ASSERT3U(level, ==, nlevels-1); | |
2727 | ASSERT(dn->dn_phys->dn_nblkptr == 0 || | |
2728 | blkid < dn->dn_phys->dn_nblkptr); | |
2729 | if (dn->dn_dbuf) { | |
2730 | dbuf_add_ref(dn->dn_dbuf, NULL); | |
2731 | *parentp = dn->dn_dbuf; | |
2732 | } | |
2733 | *bpp = &dn->dn_phys->dn_blkptr[blkid]; | |
2734 | return (0); | |
2735 | } | |
2736 | } | |
2737 | ||
2738 | static dmu_buf_impl_t * | |
2739 | dbuf_create(dnode_t *dn, uint8_t level, uint64_t blkid, | |
2740 | dmu_buf_impl_t *parent, blkptr_t *blkptr) | |
2741 | { | |
428870ff | 2742 | objset_t *os = dn->dn_objset; |
34dc7c2f BB |
2743 | dmu_buf_impl_t *db, *odb; |
2744 | ||
2745 | ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); | |
2746 | ASSERT(dn->dn_type != DMU_OT_NONE); | |
2747 | ||
d3c2ae1c | 2748 | db = kmem_cache_alloc(dbuf_kmem_cache, KM_SLEEP); |
34dc7c2f BB |
2749 | |
2750 | db->db_objset = os; | |
2751 | db->db.db_object = dn->dn_object; | |
2752 | db->db_level = level; | |
2753 | db->db_blkid = blkid; | |
2754 | db->db_last_dirty = NULL; | |
2755 | db->db_dirtycnt = 0; | |
572e2857 | 2756 | db->db_dnode_handle = dn->dn_handle; |
34dc7c2f BB |
2757 | db->db_parent = parent; |
2758 | db->db_blkptr = blkptr; | |
2759 | ||
0c66c32d | 2760 | db->db_user = NULL; |
bc4501f7 JG |
2761 | db->db_user_immediate_evict = FALSE; |
2762 | db->db_freed_in_flight = FALSE; | |
2763 | db->db_pending_evict = FALSE; | |
34dc7c2f | 2764 | |
428870ff | 2765 | if (blkid == DMU_BONUS_BLKID) { |
34dc7c2f | 2766 | ASSERT3P(parent, ==, dn->dn_dbuf); |
50c957f7 | 2767 | db->db.db_size = DN_SLOTS_TO_BONUSLEN(dn->dn_num_slots) - |
34dc7c2f BB |
2768 | (dn->dn_nblkptr-1) * sizeof (blkptr_t); |
2769 | ASSERT3U(db->db.db_size, >=, dn->dn_bonuslen); | |
428870ff | 2770 | db->db.db_offset = DMU_BONUS_BLKID; |
34dc7c2f | 2771 | db->db_state = DB_UNCACHED; |
2e5dc449 | 2772 | db->db_caching_status = DB_NO_CACHE; |
34dc7c2f | 2773 | /* the bonus dbuf is not placed in the hash table */ |
25458cbe | 2774 | arc_space_consume(sizeof (dmu_buf_impl_t), ARC_SPACE_DBUF); |
34dc7c2f | 2775 | return (db); |
428870ff BB |
2776 | } else if (blkid == DMU_SPILL_BLKID) { |
2777 | db->db.db_size = (blkptr != NULL) ? | |
2778 | BP_GET_LSIZE(blkptr) : SPA_MINBLOCKSIZE; | |
2779 | db->db.db_offset = 0; | |
34dc7c2f BB |
2780 | } else { |
2781 | int blocksize = | |
e8b96c60 | 2782 | db->db_level ? 1 << dn->dn_indblkshift : dn->dn_datablksz; |
34dc7c2f BB |
2783 | db->db.db_size = blocksize; |
2784 | db->db.db_offset = db->db_blkid * blocksize; | |
2785 | } | |
2786 | ||
2787 | /* | |
2788 | * Hold the dn_dbufs_mtx while we get the new dbuf | |
2789 | * in the hash table *and* added to the dbufs list. | |
2790 | * This prevents a possible deadlock with someone | |
2791 | * trying to look up this dbuf before its added to the | |
2792 | * dn_dbufs list. | |
2793 | */ | |
2794 | mutex_enter(&dn->dn_dbufs_mtx); | |
2795 | db->db_state = DB_EVICTING; | |
2796 | if ((odb = dbuf_hash_insert(db)) != NULL) { | |
2797 | /* someone else inserted it first */ | |
d3c2ae1c | 2798 | kmem_cache_free(dbuf_kmem_cache, db); |
34dc7c2f | 2799 | mutex_exit(&dn->dn_dbufs_mtx); |
5e021f56 | 2800 | DBUF_STAT_BUMP(hash_insert_race); |
34dc7c2f BB |
2801 | return (odb); |
2802 | } | |
8951cb8d | 2803 | avl_add(&dn->dn_dbufs, db); |
9c9531cb | 2804 | |
34dc7c2f | 2805 | db->db_state = DB_UNCACHED; |
2e5dc449 | 2806 | db->db_caching_status = DB_NO_CACHE; |
34dc7c2f | 2807 | mutex_exit(&dn->dn_dbufs_mtx); |
25458cbe | 2808 | arc_space_consume(sizeof (dmu_buf_impl_t), ARC_SPACE_DBUF); |
34dc7c2f BB |
2809 | |
2810 | if (parent && parent != dn->dn_dbuf) | |
2811 | dbuf_add_ref(parent, db); | |
2812 | ||
2813 | ASSERT(dn->dn_object == DMU_META_DNODE_OBJECT || | |
424fd7c3 | 2814 | zfs_refcount_count(&dn->dn_holds) > 0); |
c13060e4 | 2815 | (void) zfs_refcount_add(&dn->dn_holds, db); |
73ad4a9f | 2816 | atomic_inc_32(&dn->dn_dbufs_count); |
34dc7c2f BB |
2817 | |
2818 | dprintf_dbuf(db, "db=%p\n", db); | |
2819 | ||
2820 | return (db); | |
2821 | } | |
2822 | ||
fcff0f35 PD |
2823 | typedef struct dbuf_prefetch_arg { |
2824 | spa_t *dpa_spa; /* The spa to issue the prefetch in. */ | |
2825 | zbookmark_phys_t dpa_zb; /* The target block to prefetch. */ | |
2826 | int dpa_epbs; /* Entries (blkptr_t's) Per Block Shift. */ | |
2827 | int dpa_curlevel; /* The current level that we're reading */ | |
d3c2ae1c | 2828 | dnode_t *dpa_dnode; /* The dnode associated with the prefetch */ |
fcff0f35 PD |
2829 | zio_priority_t dpa_prio; /* The priority I/Os should be issued at. */ |
2830 | zio_t *dpa_zio; /* The parent zio_t for all prefetches. */ | |
2831 | arc_flags_t dpa_aflags; /* Flags to pass to the final prefetch. */ | |
2832 | } dbuf_prefetch_arg_t; | |
2833 | ||
2834 | /* | |
2835 | * Actually issue the prefetch read for the block given. | |
2836 | */ | |
2837 | static void | |
2838 | dbuf_issue_final_prefetch(dbuf_prefetch_arg_t *dpa, blkptr_t *bp) | |
2839 | { | |
fcff0f35 PD |
2840 | if (BP_IS_HOLE(bp) || BP_IS_EMBEDDED(bp)) |
2841 | return; | |
2842 | ||
4515b1d0 | 2843 | int zio_flags = ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE; |
1c27024e DB |
2844 | arc_flags_t aflags = |
2845 | dpa->dpa_aflags | ARC_FLAG_NOWAIT | ARC_FLAG_PREFETCH; | |
fcff0f35 | 2846 | |
4515b1d0 TC |
2847 | /* dnodes are always read as raw and then converted later */ |
2848 | if (BP_GET_TYPE(bp) == DMU_OT_DNODE && BP_IS_PROTECTED(bp) && | |
2849 | dpa->dpa_curlevel == 0) | |
2850 | zio_flags |= ZIO_FLAG_RAW; | |
2851 | ||
fcff0f35 PD |
2852 | ASSERT3U(dpa->dpa_curlevel, ==, BP_GET_LEVEL(bp)); |
2853 | ASSERT3U(dpa->dpa_curlevel, ==, dpa->dpa_zb.zb_level); | |
2854 | ASSERT(dpa->dpa_zio != NULL); | |
2855 | (void) arc_read(dpa->dpa_zio, dpa->dpa_spa, bp, NULL, NULL, | |
4515b1d0 | 2856 | dpa->dpa_prio, zio_flags, &aflags, &dpa->dpa_zb); |
fcff0f35 PD |
2857 | } |
2858 | ||
2859 | /* | |
2860 | * Called when an indirect block above our prefetch target is read in. This | |
2861 | * will either read in the next indirect block down the tree or issue the actual | |
2862 | * prefetch if the next block down is our target. | |
2863 | */ | |
2864 | static void | |
d4a72f23 TC |
2865 | dbuf_prefetch_indirect_done(zio_t *zio, const zbookmark_phys_t *zb, |
2866 | const blkptr_t *iobp, arc_buf_t *abuf, void *private) | |
fcff0f35 PD |
2867 | { |
2868 | dbuf_prefetch_arg_t *dpa = private; | |
fcff0f35 PD |
2869 | |
2870 | ASSERT3S(dpa->dpa_zb.zb_level, <, dpa->dpa_curlevel); | |
2871 | ASSERT3S(dpa->dpa_curlevel, >, 0); | |
d3c2ae1c | 2872 | |
c3bd3fb4 TC |
2873 | if (abuf == NULL) { |
2874 | ASSERT(zio == NULL || zio->io_error != 0); | |
2875 | kmem_free(dpa, sizeof (*dpa)); | |
2876 | return; | |
2877 | } | |
2878 | ASSERT(zio == NULL || zio->io_error == 0); | |
2879 | ||
d3c2ae1c GW |
2880 | /* |
2881 | * The dpa_dnode is only valid if we are called with a NULL | |
2882 | * zio. This indicates that the arc_read() returned without | |
2883 | * first calling zio_read() to issue a physical read. Once | |
2884 | * a physical read is made the dpa_dnode must be invalidated | |
2885 | * as the locks guarding it may have been dropped. If the | |
2886 | * dpa_dnode is still valid, then we want to add it to the dbuf | |
2887 | * cache. To do so, we must hold the dbuf associated with the block | |
2888 | * we just prefetched, read its contents so that we associate it | |
2889 | * with an arc_buf_t, and then release it. | |
2890 | */ | |
fcff0f35 PD |
2891 | if (zio != NULL) { |
2892 | ASSERT3S(BP_GET_LEVEL(zio->io_bp), ==, dpa->dpa_curlevel); | |
b5256303 | 2893 | if (zio->io_flags & ZIO_FLAG_RAW_COMPRESS) { |
d3c2ae1c GW |
2894 | ASSERT3U(BP_GET_PSIZE(zio->io_bp), ==, zio->io_size); |
2895 | } else { | |
2896 | ASSERT3U(BP_GET_LSIZE(zio->io_bp), ==, zio->io_size); | |
2897 | } | |
fcff0f35 | 2898 | ASSERT3P(zio->io_spa, ==, dpa->dpa_spa); |
d3c2ae1c GW |
2899 | |
2900 | dpa->dpa_dnode = NULL; | |
2901 | } else if (dpa->dpa_dnode != NULL) { | |
2902 | uint64_t curblkid = dpa->dpa_zb.zb_blkid >> | |
2903 | (dpa->dpa_epbs * (dpa->dpa_curlevel - | |
2904 | dpa->dpa_zb.zb_level)); | |
2905 | dmu_buf_impl_t *db = dbuf_hold_level(dpa->dpa_dnode, | |
2906 | dpa->dpa_curlevel, curblkid, FTAG); | |
305781da TC |
2907 | if (db == NULL) { |
2908 | kmem_free(dpa, sizeof (*dpa)); | |
2909 | arc_buf_destroy(abuf, private); | |
2910 | return; | |
2911 | } | |
2912 | ||
d3c2ae1c GW |
2913 | (void) dbuf_read(db, NULL, |
2914 | DB_RF_MUST_SUCCEED | DB_RF_NOPREFETCH | DB_RF_HAVESTRUCT); | |
2915 | dbuf_rele(db, FTAG); | |
fcff0f35 PD |
2916 | } |
2917 | ||
d4a72f23 | 2918 | dpa->dpa_curlevel--; |
1c27024e | 2919 | uint64_t nextblkid = dpa->dpa_zb.zb_blkid >> |
fcff0f35 | 2920 | (dpa->dpa_epbs * (dpa->dpa_curlevel - dpa->dpa_zb.zb_level)); |
1c27024e | 2921 | blkptr_t *bp = ((blkptr_t *)abuf->b_data) + |
fcff0f35 | 2922 | P2PHASE(nextblkid, 1ULL << dpa->dpa_epbs); |
d4a72f23 TC |
2923 | |
2924 | if (BP_IS_HOLE(bp)) { | |
fcff0f35 PD |
2925 | kmem_free(dpa, sizeof (*dpa)); |
2926 | } else if (dpa->dpa_curlevel == dpa->dpa_zb.zb_level) { | |
2927 | ASSERT3U(nextblkid, ==, dpa->dpa_zb.zb_blkid); | |
2928 | dbuf_issue_final_prefetch(dpa, bp); | |
2929 | kmem_free(dpa, sizeof (*dpa)); | |
2930 | } else { | |
2931 | arc_flags_t iter_aflags = ARC_FLAG_NOWAIT; | |
2932 | zbookmark_phys_t zb; | |
2933 | ||
7c351e31 | 2934 | /* flag if L2ARC eligible, l2arc_noprefetch then decides */ |
2935 | if (dpa->dpa_aflags & ARC_FLAG_L2CACHE) | |
2936 | iter_aflags |= ARC_FLAG_L2CACHE; | |
2937 | ||
fcff0f35 PD |
2938 | ASSERT3U(dpa->dpa_curlevel, ==, BP_GET_LEVEL(bp)); |
2939 | ||
2940 | SET_BOOKMARK(&zb, dpa->dpa_zb.zb_objset, | |
2941 | dpa->dpa_zb.zb_object, dpa->dpa_curlevel, nextblkid); | |
2942 | ||
2943 | (void) arc_read(dpa->dpa_zio, dpa->dpa_spa, | |
2944 | bp, dbuf_prefetch_indirect_done, dpa, dpa->dpa_prio, | |
2945 | ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE, | |
2946 | &iter_aflags, &zb); | |
2947 | } | |
d3c2ae1c GW |
2948 | |
2949 | arc_buf_destroy(abuf, private); | |
fcff0f35 PD |
2950 | } |
2951 | ||
2952 | /* | |
2953 | * Issue prefetch reads for the given block on the given level. If the indirect | |
2954 | * blocks above that block are not in memory, we will read them in | |
2955 | * asynchronously. As a result, this call never blocks waiting for a read to | |
b5256303 TC |
2956 | * complete. Note that the prefetch might fail if the dataset is encrypted and |
2957 | * the encryption key is unmapped before the IO completes. | |
fcff0f35 | 2958 | */ |
34dc7c2f | 2959 | void |
fcff0f35 PD |
2960 | dbuf_prefetch(dnode_t *dn, int64_t level, uint64_t blkid, zio_priority_t prio, |
2961 | arc_flags_t aflags) | |
34dc7c2f | 2962 | { |
fcff0f35 PD |
2963 | blkptr_t bp; |
2964 | int epbs, nlevels, curlevel; | |
2965 | uint64_t curblkid; | |
34dc7c2f | 2966 | |
428870ff | 2967 | ASSERT(blkid != DMU_BONUS_BLKID); |
34dc7c2f BB |
2968 | ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); |
2969 | ||
7f60329a MA |
2970 | if (blkid > dn->dn_maxblkid) |
2971 | return; | |
2972 | ||
34dc7c2f BB |
2973 | if (dnode_block_freed(dn, blkid)) |
2974 | return; | |
2975 | ||
fcff0f35 PD |
2976 | /* |
2977 | * This dnode hasn't been written to disk yet, so there's nothing to | |
2978 | * prefetch. | |
2979 | */ | |
2980 | nlevels = dn->dn_phys->dn_nlevels; | |
2981 | if (level >= nlevels || dn->dn_phys->dn_nblkptr == 0) | |
2982 | return; | |
2983 | ||
2984 | epbs = dn->dn_phys->dn_indblkshift - SPA_BLKPTRSHIFT; | |
2985 | if (dn->dn_phys->dn_maxblkid < blkid << (epbs * level)) | |
2986 | return; | |
2987 | ||
1c27024e | 2988 | dmu_buf_impl_t *db = dbuf_find(dn->dn_objset, dn->dn_object, |
fcff0f35 PD |
2989 | level, blkid); |
2990 | if (db != NULL) { | |
2991 | mutex_exit(&db->db_mtx); | |
572e2857 | 2992 | /* |
fcff0f35 PD |
2993 | * This dbuf already exists. It is either CACHED, or |
2994 | * (we assume) about to be read or filled. | |
572e2857 | 2995 | */ |
572e2857 | 2996 | return; |
34dc7c2f BB |
2997 | } |
2998 | ||
fcff0f35 PD |
2999 | /* |
3000 | * Find the closest ancestor (indirect block) of the target block | |
3001 | * that is present in the cache. In this indirect block, we will | |
3002 | * find the bp that is at curlevel, curblkid. | |
3003 | */ | |
3004 | curlevel = level; | |
3005 | curblkid = blkid; | |
3006 | while (curlevel < nlevels - 1) { | |
3007 | int parent_level = curlevel + 1; | |
3008 | uint64_t parent_blkid = curblkid >> epbs; | |
3009 | dmu_buf_impl_t *db; | |
3010 | ||
3011 | if (dbuf_hold_impl(dn, parent_level, parent_blkid, | |
3012 | FALSE, TRUE, FTAG, &db) == 0) { | |
3013 | blkptr_t *bpp = db->db_buf->b_data; | |
3014 | bp = bpp[P2PHASE(curblkid, 1 << epbs)]; | |
3015 | dbuf_rele(db, FTAG); | |
3016 | break; | |
3017 | } | |
428870ff | 3018 | |
fcff0f35 PD |
3019 | curlevel = parent_level; |
3020 | curblkid = parent_blkid; | |
3021 | } | |
34dc7c2f | 3022 | |
fcff0f35 PD |
3023 | if (curlevel == nlevels - 1) { |
3024 | /* No cached indirect blocks found. */ | |
3025 | ASSERT3U(curblkid, <, dn->dn_phys->dn_nblkptr); | |
3026 | bp = dn->dn_phys->dn_blkptr[curblkid]; | |
34dc7c2f | 3027 | } |
fcff0f35 PD |
3028 | if (BP_IS_HOLE(&bp)) |
3029 | return; | |
3030 | ||
3031 | ASSERT3U(curlevel, ==, BP_GET_LEVEL(&bp)); | |
3032 | ||
1c27024e | 3033 | zio_t *pio = zio_root(dmu_objset_spa(dn->dn_objset), NULL, NULL, |
fcff0f35 PD |
3034 | ZIO_FLAG_CANFAIL); |
3035 | ||
1c27024e DB |
3036 | dbuf_prefetch_arg_t *dpa = kmem_zalloc(sizeof (*dpa), KM_SLEEP); |
3037 | dsl_dataset_t *ds = dn->dn_objset->os_dsl_dataset; | |
fcff0f35 PD |
3038 | SET_BOOKMARK(&dpa->dpa_zb, ds != NULL ? ds->ds_object : DMU_META_OBJSET, |
3039 | dn->dn_object, level, blkid); | |
3040 | dpa->dpa_curlevel = curlevel; | |
3041 | dpa->dpa_prio = prio; | |
3042 | dpa->dpa_aflags = aflags; | |
3043 | dpa->dpa_spa = dn->dn_objset->os_spa; | |
d3c2ae1c | 3044 | dpa->dpa_dnode = dn; |
fcff0f35 PD |
3045 | dpa->dpa_epbs = epbs; |
3046 | dpa->dpa_zio = pio; | |
3047 | ||
7c351e31 | 3048 | /* flag if L2ARC eligible, l2arc_noprefetch then decides */ |
3049 | if (DNODE_LEVEL_IS_L2CACHEABLE(dn, level)) | |
3050 | dpa->dpa_aflags |= ARC_FLAG_L2CACHE; | |
3051 | ||
fcff0f35 PD |
3052 | /* |
3053 | * If we have the indirect just above us, no need to do the asynchronous | |
3054 | * prefetch chain; we'll just run the last step ourselves. If we're at | |
3055 | * a higher level, though, we want to issue the prefetches for all the | |
3056 | * indirect blocks asynchronously, so we can go on with whatever we were | |
3057 | * doing. | |
3058 | */ | |
3059 | if (curlevel == level) { | |
3060 | ASSERT3U(curblkid, ==, blkid); | |
3061 | dbuf_issue_final_prefetch(dpa, &bp); | |
3062 | kmem_free(dpa, sizeof (*dpa)); | |
3063 | } else { | |
3064 | arc_flags_t iter_aflags = ARC_FLAG_NOWAIT; | |
3065 | zbookmark_phys_t zb; | |
3066 | ||
7c351e31 | 3067 | /* flag if L2ARC eligible, l2arc_noprefetch then decides */ |
3068 | if (DNODE_LEVEL_IS_L2CACHEABLE(dn, level)) | |
3069 | iter_aflags |= ARC_FLAG_L2CACHE; | |
3070 | ||
fcff0f35 PD |
3071 | SET_BOOKMARK(&zb, ds != NULL ? ds->ds_object : DMU_META_OBJSET, |
3072 | dn->dn_object, curlevel, curblkid); | |
3073 | (void) arc_read(dpa->dpa_zio, dpa->dpa_spa, | |
3074 | &bp, dbuf_prefetch_indirect_done, dpa, prio, | |
3075 | ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE, | |
3076 | &iter_aflags, &zb); | |
3077 | } | |
3078 | /* | |
3079 | * We use pio here instead of dpa_zio since it's possible that | |
3080 | * dpa may have already been freed. | |
3081 | */ | |
3082 | zio_nowait(pio); | |
34dc7c2f BB |
3083 | } |
3084 | ||
d1d7e268 | 3085 | #define DBUF_HOLD_IMPL_MAX_DEPTH 20 |
fc5bb51f | 3086 | |
71a24c3c | 3087 | /* |
adb726eb | 3088 | * Helper function for dbuf_hold_impl_arg() to copy a buffer. Handles |
71a24c3c TC |
3089 | * the case of encrypted, compressed and uncompressed buffers by |
3090 | * allocating the new buffer, respectively, with arc_alloc_raw_buf(), | |
3091 | * arc_alloc_compressed_buf() or arc_alloc_buf().* | |
3092 | * | |
adb726eb | 3093 | * NOTE: Declared noinline to avoid stack bloat in dbuf_hold_impl_arg(). |
71a24c3c TC |
3094 | */ |
3095 | noinline static void | |
adb726eb | 3096 | dbuf_hold_copy(struct dbuf_hold_arg *dh) |
71a24c3c TC |
3097 | { |
3098 | dnode_t *dn = dh->dh_dn; | |
3099 | dmu_buf_impl_t *db = dh->dh_db; | |
3100 | dbuf_dirty_record_t *dr = dh->dh_dr; | |
3101 | arc_buf_t *data = dr->dt.dl.dr_data; | |
3102 | ||
3103 | enum zio_compress compress_type = arc_get_compression(data); | |
3104 | ||
3105 | if (arc_is_encrypted(data)) { | |
3106 | boolean_t byteorder; | |
3107 | uint8_t salt[ZIO_DATA_SALT_LEN]; | |
3108 | uint8_t iv[ZIO_DATA_IV_LEN]; | |
3109 | uint8_t mac[ZIO_DATA_MAC_LEN]; | |
3110 | ||
3111 | arc_get_raw_params(data, &byteorder, salt, iv, mac); | |
3112 | dbuf_set_data(db, arc_alloc_raw_buf(dn->dn_objset->os_spa, db, | |
3113 | dmu_objset_id(dn->dn_objset), byteorder, salt, iv, mac, | |
3114 | dn->dn_type, arc_buf_size(data), arc_buf_lsize(data), | |
3115 | compress_type)); | |
3116 | } else if (compress_type != ZIO_COMPRESS_OFF) { | |
3117 | dbuf_set_data(db, arc_alloc_compressed_buf( | |
3118 | dn->dn_objset->os_spa, db, arc_buf_size(data), | |
3119 | arc_buf_lsize(data), compress_type)); | |
3120 | } else { | |
3121 | dbuf_set_data(db, arc_alloc_buf(dn->dn_objset->os_spa, db, | |
3122 | DBUF_GET_BUFC_TYPE(db), db->db.db_size)); | |
3123 | } | |
3124 | ||
3125 | bcopy(data->b_data, db->db.db_data, arc_buf_size(data)); | |
3126 | } | |
3127 | ||
34dc7c2f BB |
3128 | /* |
3129 | * Returns with db_holds incremented, and db_mtx not held. | |
3130 | * Note: dn_struct_rwlock must be held. | |
3131 | */ | |
fc5bb51f | 3132 | static int |
adb726eb | 3133 | dbuf_hold_impl_arg(struct dbuf_hold_arg *dh) |
34dc7c2f | 3134 | { |
fc5bb51f | 3135 | dh->dh_parent = NULL; |
34dc7c2f | 3136 | |
fc5bb51f BB |
3137 | ASSERT(dh->dh_blkid != DMU_BONUS_BLKID); |
3138 | ASSERT(RW_LOCK_HELD(&dh->dh_dn->dn_struct_rwlock)); | |
3139 | ASSERT3U(dh->dh_dn->dn_nlevels, >, dh->dh_level); | |
34dc7c2f | 3140 | |
fc5bb51f | 3141 | *(dh->dh_dbp) = NULL; |
d3c2ae1c | 3142 | |
34dc7c2f | 3143 | /* dbuf_find() returns with db_mtx held */ |
6ebebace JG |
3144 | dh->dh_db = dbuf_find(dh->dh_dn->dn_objset, dh->dh_dn->dn_object, |
3145 | dh->dh_level, dh->dh_blkid); | |
fc5bb51f BB |
3146 | |
3147 | if (dh->dh_db == NULL) { | |
3148 | dh->dh_bp = NULL; | |
3149 | ||
fcff0f35 PD |
3150 | if (dh->dh_fail_uncached) |
3151 | return (SET_ERROR(ENOENT)); | |
3152 | ||
fc5bb51f BB |
3153 | ASSERT3P(dh->dh_parent, ==, NULL); |
3154 | dh->dh_err = dbuf_findbp(dh->dh_dn, dh->dh_level, dh->dh_blkid, | |
adb726eb | 3155 | dh->dh_fail_sparse, &dh->dh_parent, &dh->dh_bp); |
fc5bb51f | 3156 | if (dh->dh_fail_sparse) { |
d1d7e268 MK |
3157 | if (dh->dh_err == 0 && |
3158 | dh->dh_bp && BP_IS_HOLE(dh->dh_bp)) | |
2e528b49 | 3159 | dh->dh_err = SET_ERROR(ENOENT); |
fc5bb51f BB |
3160 | if (dh->dh_err) { |
3161 | if (dh->dh_parent) | |
3162 | dbuf_rele(dh->dh_parent, NULL); | |
3163 | return (dh->dh_err); | |
34dc7c2f BB |
3164 | } |
3165 | } | |
fc5bb51f BB |
3166 | if (dh->dh_err && dh->dh_err != ENOENT) |
3167 | return (dh->dh_err); | |
3168 | dh->dh_db = dbuf_create(dh->dh_dn, dh->dh_level, dh->dh_blkid, | |
02730c33 | 3169 | dh->dh_parent, dh->dh_bp); |
34dc7c2f BB |
3170 | } |
3171 | ||
fcff0f35 PD |
3172 | if (dh->dh_fail_uncached && dh->dh_db->db_state != DB_CACHED) { |
3173 | mutex_exit(&dh->dh_db->db_mtx); | |
3174 | return (SET_ERROR(ENOENT)); | |
3175 | } | |
3176 | ||
0873bb63 BB |
3177 | if (dh->dh_db->db_buf != NULL) { |
3178 | arc_buf_access(dh->dh_db->db_buf); | |
fc5bb51f | 3179 | ASSERT3P(dh->dh_db->db.db_data, ==, dh->dh_db->db_buf->b_data); |
0873bb63 | 3180 | } |
34dc7c2f | 3181 | |
fc5bb51f | 3182 | ASSERT(dh->dh_db->db_buf == NULL || arc_referenced(dh->dh_db->db_buf)); |
34dc7c2f BB |
3183 | |
3184 | /* | |
3185 | * If this buffer is currently syncing out, and we are are | |
3186 | * still referencing it from db_data, we need to make a copy | |
3187 | * of it in case we decide we want to dirty it again in this txg. | |
3188 | */ | |
fc5bb51f BB |
3189 | if (dh->dh_db->db_level == 0 && |
3190 | dh->dh_db->db_blkid != DMU_BONUS_BLKID && | |
3191 | dh->dh_dn->dn_object != DMU_META_DNODE_OBJECT && | |
3192 | dh->dh_db->db_state == DB_CACHED && dh->dh_db->db_data_pending) { | |
3193 | dh->dh_dr = dh->dh_db->db_data_pending; | |
71a24c3c TC |
3194 | if (dh->dh_dr->dt.dl.dr_data == dh->dh_db->db_buf) |
3195 | dbuf_hold_copy(dh); | |
34dc7c2f BB |
3196 | } |
3197 | ||
d3c2ae1c | 3198 | if (multilist_link_active(&dh->dh_db->db_cache_link)) { |
424fd7c3 | 3199 | ASSERT(zfs_refcount_is_zero(&dh->dh_db->db_holds)); |
2e5dc449 MA |
3200 | ASSERT(dh->dh_db->db_caching_status == DB_DBUF_CACHE || |
3201 | dh->dh_db->db_caching_status == DB_DBUF_METADATA_CACHE); | |
3202 | ||
3203 | multilist_remove( | |
3204 | dbuf_caches[dh->dh_db->db_caching_status].cache, | |
3205 | dh->dh_db); | |
424fd7c3 | 3206 | (void) zfs_refcount_remove_many( |
2e5dc449 | 3207 | &dbuf_caches[dh->dh_db->db_caching_status].size, |
d3c2ae1c | 3208 | dh->dh_db->db.db_size, dh->dh_db); |
2e5dc449 MA |
3209 | |
3210 | if (dh->dh_db->db_caching_status == DB_DBUF_METADATA_CACHE) { | |
3211 | DBUF_STAT_BUMPDOWN(metadata_cache_count); | |
3212 | } else { | |
3213 | DBUF_STAT_BUMPDOWN(cache_levels[dh->dh_db->db_level]); | |
3214 | DBUF_STAT_BUMPDOWN(cache_count); | |
3215 | DBUF_STAT_DECR(cache_levels_bytes[dh->dh_db->db_level], | |
3216 | dh->dh_db->db.db_size); | |
3217 | } | |
3218 | dh->dh_db->db_caching_status = DB_NO_CACHE; | |
d3c2ae1c | 3219 | } |
c13060e4 | 3220 | (void) zfs_refcount_add(&dh->dh_db->db_holds, dh->dh_tag); |
fc5bb51f BB |
3221 | DBUF_VERIFY(dh->dh_db); |
3222 | mutex_exit(&dh->dh_db->db_mtx); | |
34dc7c2f BB |
3223 | |
3224 | /* NOTE: we can't rele the parent until after we drop the db_mtx */ | |
fc5bb51f BB |
3225 | if (dh->dh_parent) |
3226 | dbuf_rele(dh->dh_parent, NULL); | |
34dc7c2f | 3227 | |
fc5bb51f BB |
3228 | ASSERT3P(DB_DNODE(dh->dh_db), ==, dh->dh_dn); |
3229 | ASSERT3U(dh->dh_db->db_blkid, ==, dh->dh_blkid); | |
3230 | ASSERT3U(dh->dh_db->db_level, ==, dh->dh_level); | |
3231 | *(dh->dh_dbp) = dh->dh_db; | |
34dc7c2f BB |
3232 | |
3233 | return (0); | |
3234 | } | |
3235 | ||
fc5bb51f | 3236 | /* |
adb726eb MA |
3237 | * dbuf_hold_impl_arg() is called recursively, via dbuf_findbp(). There can |
3238 | * be as many recursive calls as there are levels of on-disk indirect blocks, | |
3239 | * but typically only 0-2 recursive calls. To minimize the stack frame size, | |
3240 | * the recursive function's arguments and "local variables" are allocated on | |
3241 | * the heap as the dbuf_hold_arg_t. | |
fc5bb51f BB |
3242 | */ |
3243 | int | |
fcff0f35 PD |
3244 | dbuf_hold_impl(dnode_t *dn, uint8_t level, uint64_t blkid, |
3245 | boolean_t fail_sparse, boolean_t fail_uncached, | |
fc5bb51f BB |
3246 | void *tag, dmu_buf_impl_t **dbp) |
3247 | { | |
adb726eb MA |
3248 | dbuf_hold_arg_t *dh = dbuf_hold_arg_create(dn, level, blkid, |
3249 | fail_sparse, fail_uncached, tag, dbp); | |
fc5bb51f | 3250 | |
adb726eb | 3251 | int error = dbuf_hold_impl_arg(dh); |
fc5bb51f | 3252 | |
adb726eb | 3253 | dbuf_hold_arg_destroy(dh); |
fc5bb51f BB |
3254 | |
3255 | return (error); | |
3256 | } | |
3257 | ||
adb726eb MA |
3258 | static dbuf_hold_arg_t * |
3259 | dbuf_hold_arg_create(dnode_t *dn, uint8_t level, uint64_t blkid, | |
4ea3f864 | 3260 | boolean_t fail_sparse, boolean_t fail_uncached, |
adb726eb | 3261 | void *tag, dmu_buf_impl_t **dbp) |
fc5bb51f | 3262 | { |
adb726eb | 3263 | dbuf_hold_arg_t *dh = kmem_alloc(sizeof (*dh), KM_SLEEP); |
fc5bb51f BB |
3264 | dh->dh_dn = dn; |
3265 | dh->dh_level = level; | |
3266 | dh->dh_blkid = blkid; | |
fcff0f35 | 3267 | |
fc5bb51f | 3268 | dh->dh_fail_sparse = fail_sparse; |
fcff0f35 PD |
3269 | dh->dh_fail_uncached = fail_uncached; |
3270 | ||
fc5bb51f BB |
3271 | dh->dh_tag = tag; |
3272 | dh->dh_dbp = dbp; | |
d9eea113 MA |
3273 | |
3274 | dh->dh_db = NULL; | |
3275 | dh->dh_parent = NULL; | |
3276 | dh->dh_bp = NULL; | |
3277 | dh->dh_err = 0; | |
3278 | dh->dh_dr = NULL; | |
d9eea113 | 3279 | |
adb726eb MA |
3280 | return (dh); |
3281 | } | |
3282 | ||
3283 | static void | |
3284 | dbuf_hold_arg_destroy(dbuf_hold_arg_t *dh) | |
3285 | { | |
3286 | kmem_free(dh, sizeof (*dh)); | |
fc5bb51f BB |
3287 | } |
3288 | ||
34dc7c2f BB |
3289 | dmu_buf_impl_t * |
3290 | dbuf_hold(dnode_t *dn, uint64_t blkid, void *tag) | |
3291 | { | |
fcff0f35 | 3292 | return (dbuf_hold_level(dn, 0, blkid, tag)); |
34dc7c2f BB |
3293 | } |
3294 | ||
3295 | dmu_buf_impl_t * | |
3296 | dbuf_hold_level(dnode_t *dn, int level, uint64_t blkid, void *tag) | |
3297 | { | |
3298 | dmu_buf_impl_t *db; | |
fcff0f35 | 3299 | int err = dbuf_hold_impl(dn, level, blkid, FALSE, FALSE, tag, &db); |
34dc7c2f BB |
3300 | return (err ? NULL : db); |
3301 | } | |
3302 | ||
3303 | void | |
3304 | dbuf_create_bonus(dnode_t *dn) | |
3305 | { | |
3306 | ASSERT(RW_WRITE_HELD(&dn->dn_struct_rwlock)); | |
3307 | ||
3308 | ASSERT(dn->dn_bonus == NULL); | |
428870ff BB |
3309 | dn->dn_bonus = dbuf_create(dn, 0, DMU_BONUS_BLKID, dn->dn_dbuf, NULL); |
3310 | } | |
3311 | ||
3312 | int | |
3313 | dbuf_spill_set_blksz(dmu_buf_t *db_fake, uint64_t blksz, dmu_tx_t *tx) | |
3314 | { | |
3315 | dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; | |
572e2857 BB |
3316 | dnode_t *dn; |
3317 | ||
428870ff | 3318 | if (db->db_blkid != DMU_SPILL_BLKID) |
2e528b49 | 3319 | return (SET_ERROR(ENOTSUP)); |
428870ff BB |
3320 | if (blksz == 0) |
3321 | blksz = SPA_MINBLOCKSIZE; | |
f1512ee6 MA |
3322 | ASSERT3U(blksz, <=, spa_maxblocksize(dmu_objset_spa(db->db_objset))); |
3323 | blksz = P2ROUNDUP(blksz, SPA_MINBLOCKSIZE); | |
428870ff | 3324 | |
572e2857 BB |
3325 | DB_DNODE_ENTER(db); |
3326 | dn = DB_DNODE(db); | |
3327 | rw_enter(&dn->dn_struct_rwlock, RW_WRITER); | |
428870ff | 3328 | dbuf_new_size(db, blksz, tx); |
572e2857 BB |
3329 | rw_exit(&dn->dn_struct_rwlock); |
3330 | DB_DNODE_EXIT(db); | |
428870ff BB |
3331 | |
3332 | return (0); | |
3333 | } | |
3334 | ||
3335 | void | |
3336 | dbuf_rm_spill(dnode_t *dn, dmu_tx_t *tx) | |
3337 | { | |
3338 | dbuf_free_range(dn, DMU_SPILL_BLKID, DMU_SPILL_BLKID, tx); | |
34dc7c2f BB |
3339 | } |
3340 | ||
3341 | #pragma weak dmu_buf_add_ref = dbuf_add_ref | |
3342 | void | |
3343 | dbuf_add_ref(dmu_buf_impl_t *db, void *tag) | |
3344 | { | |
c13060e4 | 3345 | int64_t holds = zfs_refcount_add(&db->db_holds, tag); |
d3c2ae1c | 3346 | VERIFY3S(holds, >, 1); |
34dc7c2f BB |
3347 | } |
3348 | ||
6ebebace JG |
3349 | #pragma weak dmu_buf_try_add_ref = dbuf_try_add_ref |
3350 | boolean_t | |
3351 | dbuf_try_add_ref(dmu_buf_t *db_fake, objset_t *os, uint64_t obj, uint64_t blkid, | |
3352 | void *tag) | |
3353 | { | |
3354 | dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; | |
3355 | dmu_buf_impl_t *found_db; | |
3356 | boolean_t result = B_FALSE; | |
3357 | ||
d617648c | 3358 | if (blkid == DMU_BONUS_BLKID) |
6ebebace JG |
3359 | found_db = dbuf_find_bonus(os, obj); |
3360 | else | |
3361 | found_db = dbuf_find(os, obj, 0, blkid); | |
3362 | ||
3363 | if (found_db != NULL) { | |
3364 | if (db == found_db && dbuf_refcount(db) > db->db_dirtycnt) { | |
c13060e4 | 3365 | (void) zfs_refcount_add(&db->db_holds, tag); |
6ebebace JG |
3366 | result = B_TRUE; |
3367 | } | |
d617648c | 3368 | mutex_exit(&found_db->db_mtx); |
6ebebace JG |
3369 | } |
3370 | return (result); | |
3371 | } | |
3372 | ||
572e2857 BB |
3373 | /* |
3374 | * If you call dbuf_rele() you had better not be referencing the dnode handle | |
3375 | * unless you have some other direct or indirect hold on the dnode. (An indirect | |
3376 | * hold is a hold on one of the dnode's dbufs, including the bonus buffer.) | |
3377 | * Without that, the dbuf_rele() could lead to a dnode_rele() followed by the | |
3378 | * dnode's parent dbuf evicting its dnode handles. | |
3379 | */ | |
34dc7c2f BB |
3380 | void |
3381 | dbuf_rele(dmu_buf_impl_t *db, void *tag) | |
428870ff BB |
3382 | { |
3383 | mutex_enter(&db->db_mtx); | |
3d503a76 | 3384 | dbuf_rele_and_unlock(db, tag, B_FALSE); |
428870ff BB |
3385 | } |
3386 | ||
b0bc7a84 MG |
3387 | void |
3388 | dmu_buf_rele(dmu_buf_t *db, void *tag) | |
3389 | { | |
3390 | dbuf_rele((dmu_buf_impl_t *)db, tag); | |
3391 | } | |
3392 | ||
428870ff BB |
3393 | /* |
3394 | * dbuf_rele() for an already-locked dbuf. This is necessary to allow | |
1fac63e5 MA |
3395 | * db_dirtycnt and db_holds to be updated atomically. The 'evicting' |
3396 | * argument should be set if we are already in the dbuf-evicting code | |
3397 | * path, in which case we don't want to recursively evict. This allows us to | |
3398 | * avoid deeply nested stacks that would have a call flow similar to this: | |
3399 | * | |
3400 | * dbuf_rele()-->dbuf_rele_and_unlock()-->dbuf_evict_notify() | |
3401 | * ^ | | |
3402 | * | | | |
3403 | * +-----dbuf_destroy()<--dbuf_evict_one()<--------+ | |
3404 | * | |
428870ff BB |
3405 | */ |
3406 | void | |
3d503a76 | 3407 | dbuf_rele_and_unlock(dmu_buf_impl_t *db, void *tag, boolean_t evicting) |
34dc7c2f BB |
3408 | { |
3409 | int64_t holds; | |
3410 | ||
428870ff | 3411 | ASSERT(MUTEX_HELD(&db->db_mtx)); |
34dc7c2f BB |
3412 | DBUF_VERIFY(db); |
3413 | ||
572e2857 BB |
3414 | /* |
3415 | * Remove the reference to the dbuf before removing its hold on the | |
3416 | * dnode so we can guarantee in dnode_move() that a referenced bonus | |
3417 | * buffer has a corresponding dnode hold. | |
3418 | */ | |
424fd7c3 | 3419 | holds = zfs_refcount_remove(&db->db_holds, tag); |
34dc7c2f BB |
3420 | ASSERT(holds >= 0); |
3421 | ||
3422 | /* | |
3423 | * We can't freeze indirects if there is a possibility that they | |
3424 | * may be modified in the current syncing context. | |
3425 | */ | |
d3c2ae1c GW |
3426 | if (db->db_buf != NULL && |
3427 | holds == (db->db_level == 0 ? db->db_dirtycnt : 0)) { | |
34dc7c2f | 3428 | arc_buf_freeze(db->db_buf); |
d3c2ae1c | 3429 | } |
34dc7c2f BB |
3430 | |
3431 | if (holds == db->db_dirtycnt && | |
bc4501f7 | 3432 | db->db_level == 0 && db->db_user_immediate_evict) |
34dc7c2f BB |
3433 | dbuf_evict_user(db); |
3434 | ||
3435 | if (holds == 0) { | |
428870ff | 3436 | if (db->db_blkid == DMU_BONUS_BLKID) { |
4c7b7eed | 3437 | dnode_t *dn; |
bc4501f7 | 3438 | boolean_t evict_dbuf = db->db_pending_evict; |
572e2857 BB |
3439 | |
3440 | /* | |
4c7b7eed JG |
3441 | * If the dnode moves here, we cannot cross this |
3442 | * barrier until the move completes. | |
572e2857 BB |
3443 | */ |
3444 | DB_DNODE_ENTER(db); | |
4c7b7eed JG |
3445 | |
3446 | dn = DB_DNODE(db); | |
3447 | atomic_dec_32(&dn->dn_dbufs_count); | |
3448 | ||
3449 | /* | |
3450 | * Decrementing the dbuf count means that the bonus | |
3451 | * buffer's dnode hold is no longer discounted in | |
3452 | * dnode_move(). The dnode cannot move until after | |
bc4501f7 | 3453 | * the dnode_rele() below. |
4c7b7eed | 3454 | */ |
572e2857 | 3455 | DB_DNODE_EXIT(db); |
4c7b7eed JG |
3456 | |
3457 | /* | |
3458 | * Do not reference db after its lock is dropped. | |
3459 | * Another thread may evict it. | |
3460 | */ | |
3461 | mutex_exit(&db->db_mtx); | |
3462 | ||
bc4501f7 | 3463 | if (evict_dbuf) |
4c7b7eed | 3464 | dnode_evict_bonus(dn); |
bc4501f7 JG |
3465 | |
3466 | dnode_rele(dn, db); | |
34dc7c2f BB |
3467 | } else if (db->db_buf == NULL) { |
3468 | /* | |
3469 | * This is a special case: we never associated this | |
3470 | * dbuf with any data allocated from the ARC. | |
3471 | */ | |
b128c09f BB |
3472 | ASSERT(db->db_state == DB_UNCACHED || |
3473 | db->db_state == DB_NOFILL); | |
d3c2ae1c | 3474 | dbuf_destroy(db); |
34dc7c2f | 3475 | } else if (arc_released(db->db_buf)) { |
34dc7c2f BB |
3476 | /* |
3477 | * This dbuf has anonymous data associated with it. | |
3478 | */ | |
d3c2ae1c | 3479 | dbuf_destroy(db); |
34dc7c2f | 3480 | } else { |
d3c2ae1c GW |
3481 | boolean_t do_arc_evict = B_FALSE; |
3482 | blkptr_t bp; | |
3483 | spa_t *spa = dmu_objset_spa(db->db_objset); | |
3484 | ||
3485 | if (!DBUF_IS_CACHEABLE(db) && | |
3486 | db->db_blkptr != NULL && | |
3487 | !BP_IS_HOLE(db->db_blkptr) && | |
3488 | !BP_IS_EMBEDDED(db->db_blkptr)) { | |
3489 | do_arc_evict = B_TRUE; | |
3490 | bp = *db->db_blkptr; | |
3491 | } | |
1eb5bfa3 | 3492 | |
d3c2ae1c GW |
3493 | if (!DBUF_IS_CACHEABLE(db) || |
3494 | db->db_pending_evict) { | |
3495 | dbuf_destroy(db); | |
3496 | } else if (!multilist_link_active(&db->db_cache_link)) { | |
2e5dc449 MA |
3497 | ASSERT3U(db->db_caching_status, ==, |
3498 | DB_NO_CACHE); | |
3499 | ||
3500 | dbuf_cached_state_t dcs = | |
3501 | dbuf_include_in_metadata_cache(db) ? | |
3502 | DB_DBUF_METADATA_CACHE : DB_DBUF_CACHE; | |
3503 | db->db_caching_status = dcs; | |
3504 | ||
3505 | multilist_insert(dbuf_caches[dcs].cache, db); | |
424fd7c3 TS |
3506 | (void) zfs_refcount_add_many( |
3507 | &dbuf_caches[dcs].size, | |
d3c2ae1c | 3508 | db->db.db_size, db); |
2e5dc449 MA |
3509 | |
3510 | if (dcs == DB_DBUF_METADATA_CACHE) { | |
3511 | DBUF_STAT_BUMP(metadata_cache_count); | |
3512 | DBUF_STAT_MAX( | |
3513 | metadata_cache_size_bytes_max, | |
424fd7c3 | 3514 | zfs_refcount_count( |
2e5dc449 MA |
3515 | &dbuf_caches[dcs].size)); |
3516 | } else { | |
3517 | DBUF_STAT_BUMP( | |
3518 | cache_levels[db->db_level]); | |
3519 | DBUF_STAT_BUMP(cache_count); | |
3520 | DBUF_STAT_INCR( | |
3521 | cache_levels_bytes[db->db_level], | |
3522 | db->db.db_size); | |
3523 | DBUF_STAT_MAX(cache_size_bytes_max, | |
424fd7c3 | 3524 | zfs_refcount_count( |
2e5dc449 MA |
3525 | &dbuf_caches[dcs].size)); |
3526 | } | |
b128c09f | 3527 | mutex_exit(&db->db_mtx); |
d3c2ae1c | 3528 | |
3d503a76 GW |
3529 | if (db->db_caching_status == DB_DBUF_CACHE && |
3530 | !evicting) { | |
1fac63e5 | 3531 | dbuf_evict_notify(); |
2e5dc449 | 3532 | } |
bd089c54 | 3533 | } |
d3c2ae1c GW |
3534 | |
3535 | if (do_arc_evict) | |
3536 | arc_freed(spa, &bp); | |
34dc7c2f BB |
3537 | } |
3538 | } else { | |
3539 | mutex_exit(&db->db_mtx); | |
3540 | } | |
d3c2ae1c | 3541 | |
34dc7c2f BB |
3542 | } |
3543 | ||
3544 | #pragma weak dmu_buf_refcount = dbuf_refcount | |
3545 | uint64_t | |
3546 | dbuf_refcount(dmu_buf_impl_t *db) | |
3547 | { | |
424fd7c3 | 3548 | return (zfs_refcount_count(&db->db_holds)); |
34dc7c2f BB |
3549 | } |
3550 | ||
cd32e5db TC |
3551 | uint64_t |
3552 | dmu_buf_user_refcount(dmu_buf_t *db_fake) | |
3553 | { | |
3554 | uint64_t holds; | |
3555 | dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; | |
3556 | ||
3557 | mutex_enter(&db->db_mtx); | |
424fd7c3 TS |
3558 | ASSERT3U(zfs_refcount_count(&db->db_holds), >=, db->db_dirtycnt); |
3559 | holds = zfs_refcount_count(&db->db_holds) - db->db_dirtycnt; | |
cd32e5db TC |
3560 | mutex_exit(&db->db_mtx); |
3561 | ||
3562 | return (holds); | |
3563 | } | |
3564 | ||
34dc7c2f | 3565 | void * |
0c66c32d JG |
3566 | dmu_buf_replace_user(dmu_buf_t *db_fake, dmu_buf_user_t *old_user, |
3567 | dmu_buf_user_t *new_user) | |
34dc7c2f | 3568 | { |
0c66c32d JG |
3569 | dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; |
3570 | ||
3571 | mutex_enter(&db->db_mtx); | |
3572 | dbuf_verify_user(db, DBVU_NOT_EVICTING); | |
3573 | if (db->db_user == old_user) | |
3574 | db->db_user = new_user; | |
3575 | else | |
3576 | old_user = db->db_user; | |
3577 | dbuf_verify_user(db, DBVU_NOT_EVICTING); | |
3578 | mutex_exit(&db->db_mtx); | |
3579 | ||
3580 | return (old_user); | |
34dc7c2f BB |
3581 | } |
3582 | ||
3583 | void * | |
0c66c32d | 3584 | dmu_buf_set_user(dmu_buf_t *db_fake, dmu_buf_user_t *user) |
34dc7c2f | 3585 | { |
0c66c32d | 3586 | return (dmu_buf_replace_user(db_fake, NULL, user)); |
34dc7c2f BB |
3587 | } |
3588 | ||
3589 | void * | |
0c66c32d | 3590 | dmu_buf_set_user_ie(dmu_buf_t *db_fake, dmu_buf_user_t *user) |
34dc7c2f BB |
3591 | { |
3592 | dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; | |
34dc7c2f | 3593 | |
bc4501f7 | 3594 | db->db_user_immediate_evict = TRUE; |
0c66c32d JG |
3595 | return (dmu_buf_set_user(db_fake, user)); |
3596 | } | |
34dc7c2f | 3597 | |
0c66c32d JG |
3598 | void * |
3599 | dmu_buf_remove_user(dmu_buf_t *db_fake, dmu_buf_user_t *user) | |
3600 | { | |
3601 | return (dmu_buf_replace_user(db_fake, user, NULL)); | |
34dc7c2f BB |
3602 | } |
3603 | ||
3604 | void * | |
3605 | dmu_buf_get_user(dmu_buf_t *db_fake) | |
3606 | { | |
3607 | dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; | |
34dc7c2f | 3608 | |
0c66c32d JG |
3609 | dbuf_verify_user(db, DBVU_NOT_EVICTING); |
3610 | return (db->db_user); | |
3611 | } | |
3612 | ||
3613 | void | |
3614 | dmu_buf_user_evict_wait() | |
3615 | { | |
3616 | taskq_wait(dbu_evict_taskq); | |
34dc7c2f BB |
3617 | } |
3618 | ||
03c6040b GW |
3619 | blkptr_t * |
3620 | dmu_buf_get_blkptr(dmu_buf_t *db) | |
3621 | { | |
3622 | dmu_buf_impl_t *dbi = (dmu_buf_impl_t *)db; | |
3623 | return (dbi->db_blkptr); | |
3624 | } | |
3625 | ||
8bea9815 MA |
3626 | objset_t * |
3627 | dmu_buf_get_objset(dmu_buf_t *db) | |
3628 | { | |
3629 | dmu_buf_impl_t *dbi = (dmu_buf_impl_t *)db; | |
3630 | return (dbi->db_objset); | |
3631 | } | |
3632 | ||
2bce8049 MA |
3633 | dnode_t * |
3634 | dmu_buf_dnode_enter(dmu_buf_t *db) | |
3635 | { | |
3636 | dmu_buf_impl_t *dbi = (dmu_buf_impl_t *)db; | |
3637 | DB_DNODE_ENTER(dbi); | |
3638 | return (DB_DNODE(dbi)); | |
3639 | } | |
3640 | ||
3641 | void | |
3642 | dmu_buf_dnode_exit(dmu_buf_t *db) | |
3643 | { | |
3644 | dmu_buf_impl_t *dbi = (dmu_buf_impl_t *)db; | |
3645 | DB_DNODE_EXIT(dbi); | |
3646 | } | |
3647 | ||
34dc7c2f BB |
3648 | static void |
3649 | dbuf_check_blkptr(dnode_t *dn, dmu_buf_impl_t *db) | |
3650 | { | |
3651 | /* ASSERT(dmu_tx_is_syncing(tx) */ | |
3652 | ASSERT(MUTEX_HELD(&db->db_mtx)); | |
3653 | ||
3654 | if (db->db_blkptr != NULL) | |
3655 | return; | |
3656 | ||
428870ff | 3657 | if (db->db_blkid == DMU_SPILL_BLKID) { |
50c957f7 | 3658 | db->db_blkptr = DN_SPILL_BLKPTR(dn->dn_phys); |
428870ff BB |
3659 | BP_ZERO(db->db_blkptr); |
3660 | return; | |
3661 | } | |
34dc7c2f BB |
3662 | if (db->db_level == dn->dn_phys->dn_nlevels-1) { |
3663 | /* | |
3664 | * This buffer was allocated at a time when there was | |
3665 | * no available blkptrs from the dnode, or it was | |
3666 | * inappropriate to hook it in (i.e., nlevels mis-match). | |
3667 | */ | |
3668 | ASSERT(db->db_blkid < dn->dn_phys->dn_nblkptr); | |
3669 | ASSERT(db->db_parent == NULL); | |
3670 | db->db_parent = dn->dn_dbuf; | |
3671 | db->db_blkptr = &dn->dn_phys->dn_blkptr[db->db_blkid]; | |
3672 | DBUF_VERIFY(db); | |
3673 | } else { | |
3674 | dmu_buf_impl_t *parent = db->db_parent; | |
3675 | int epbs = dn->dn_phys->dn_indblkshift - SPA_BLKPTRSHIFT; | |
3676 | ||
3677 | ASSERT(dn->dn_phys->dn_nlevels > 1); | |
3678 | if (parent == NULL) { | |
3679 | mutex_exit(&db->db_mtx); | |
3680 | rw_enter(&dn->dn_struct_rwlock, RW_READER); | |
fcff0f35 PD |
3681 | parent = dbuf_hold_level(dn, db->db_level + 1, |
3682 | db->db_blkid >> epbs, db); | |
34dc7c2f BB |
3683 | rw_exit(&dn->dn_struct_rwlock); |
3684 | mutex_enter(&db->db_mtx); | |
3685 | db->db_parent = parent; | |
3686 | } | |
3687 | db->db_blkptr = (blkptr_t *)parent->db.db_data + | |
3688 | (db->db_blkid & ((1ULL << epbs) - 1)); | |
3689 | DBUF_VERIFY(db); | |
3690 | } | |
3691 | } | |
3692 | ||
b5256303 | 3693 | /* |
0c03d21a MA |
3694 | * When syncing out a blocks of dnodes, adjust the block to deal with |
3695 | * encryption. Normally, we make sure the block is decrypted before writing | |
3696 | * it. If we have crypt params, then we are writing a raw (encrypted) block, | |
3697 | * from a raw receive. In this case, set the ARC buf's crypt params so | |
3698 | * that the BP will be filled with the correct byteorder, salt, iv, and mac. | |
b5256303 TC |
3699 | */ |
3700 | static void | |
0c03d21a | 3701 | dbuf_prepare_encrypted_dnode_leaf(dbuf_dirty_record_t *dr) |
b5256303 TC |
3702 | { |
3703 | int err; | |
3704 | dmu_buf_impl_t *db = dr->dr_dbuf; | |
3705 | ||
3706 | ASSERT(MUTEX_HELD(&db->db_mtx)); | |
0c03d21a MA |
3707 | ASSERT3U(db->db.db_object, ==, DMU_META_DNODE_OBJECT); |
3708 | ASSERT3U(db->db_level, ==, 0); | |
b5256303 | 3709 | |
0c03d21a | 3710 | if (!db->db_objset->os_raw_receive && arc_is_encrypted(db->db_buf)) { |
a2c2ed1b TC |
3711 | zbookmark_phys_t zb; |
3712 | ||
b5256303 TC |
3713 | /* |
3714 | * Unfortunately, there is currently no mechanism for | |
3715 | * syncing context to handle decryption errors. An error | |
3716 | * here is only possible if an attacker maliciously | |
3717 | * changed a dnode block and updated the associated | |
3718 | * checksums going up the block tree. | |
3719 | */ | |
a2c2ed1b TC |
3720 | SET_BOOKMARK(&zb, dmu_objset_id(db->db_objset), |
3721 | db->db.db_object, db->db_level, db->db_blkid); | |
b5256303 | 3722 | err = arc_untransform(db->db_buf, db->db_objset->os_spa, |
a2c2ed1b | 3723 | &zb, B_TRUE); |
b5256303 TC |
3724 | if (err) |
3725 | panic("Invalid dnode block MAC"); | |
0c03d21a MA |
3726 | } else if (dr->dt.dl.dr_has_raw_params) { |
3727 | (void) arc_release(dr->dt.dl.dr_data, db); | |
3728 | arc_convert_to_raw(dr->dt.dl.dr_data, | |
3729 | dmu_objset_id(db->db_objset), | |
3730 | dr->dt.dl.dr_byteorder, DMU_OT_DNODE, | |
3731 | dr->dt.dl.dr_salt, dr->dt.dl.dr_iv, dr->dt.dl.dr_mac); | |
b5256303 TC |
3732 | } |
3733 | } | |
3734 | ||
d1d7e268 MK |
3735 | /* |
3736 | * dbuf_sync_indirect() is called recursively from dbuf_sync_list() so it | |
60948de1 BB |
3737 | * is critical the we not allow the compiler to inline this function in to |
3738 | * dbuf_sync_list() thereby drastically bloating the stack usage. | |
3739 | */ | |
3740 | noinline static void | |
34dc7c2f BB |
3741 | dbuf_sync_indirect(dbuf_dirty_record_t *dr, dmu_tx_t *tx) |
3742 | { | |
3743 | dmu_buf_impl_t *db = dr->dr_dbuf; | |
572e2857 | 3744 | dnode_t *dn; |
34dc7c2f BB |
3745 | zio_t *zio; |
3746 | ||
3747 | ASSERT(dmu_tx_is_syncing(tx)); | |
3748 | ||
3749 | dprintf_dbuf_bp(db, db->db_blkptr, "blkptr=%p", db->db_blkptr); | |
3750 | ||
3751 | mutex_enter(&db->db_mtx); | |
3752 | ||
3753 | ASSERT(db->db_level > 0); | |
3754 | DBUF_VERIFY(db); | |
3755 | ||
e49f1e20 | 3756 | /* Read the block if it hasn't been read yet. */ |
34dc7c2f BB |
3757 | if (db->db_buf == NULL) { |
3758 | mutex_exit(&db->db_mtx); | |
3759 | (void) dbuf_read(db, NULL, DB_RF_MUST_SUCCEED); | |
3760 | mutex_enter(&db->db_mtx); | |
3761 | } | |
3762 | ASSERT3U(db->db_state, ==, DB_CACHED); | |
34dc7c2f BB |
3763 | ASSERT(db->db_buf != NULL); |
3764 | ||
572e2857 BB |
3765 | DB_DNODE_ENTER(db); |
3766 | dn = DB_DNODE(db); | |
e49f1e20 | 3767 | /* Indirect block size must match what the dnode thinks it is. */ |
572e2857 | 3768 | ASSERT3U(db->db.db_size, ==, 1<<dn->dn_phys->dn_indblkshift); |
34dc7c2f | 3769 | dbuf_check_blkptr(dn, db); |
572e2857 | 3770 | DB_DNODE_EXIT(db); |
34dc7c2f | 3771 | |
e49f1e20 | 3772 | /* Provide the pending dirty record to child dbufs */ |
34dc7c2f BB |
3773 | db->db_data_pending = dr; |
3774 | ||
34dc7c2f | 3775 | mutex_exit(&db->db_mtx); |
a1d477c2 | 3776 | |
b128c09f | 3777 | dbuf_write(dr, db->db_buf, tx); |
34dc7c2f BB |
3778 | |
3779 | zio = dr->dr_zio; | |
3780 | mutex_enter(&dr->dt.di.dr_mtx); | |
4bda3bd0 | 3781 | dbuf_sync_list(&dr->dt.di.dr_children, db->db_level - 1, tx); |
34dc7c2f BB |
3782 | ASSERT(list_head(&dr->dt.di.dr_children) == NULL); |
3783 | mutex_exit(&dr->dt.di.dr_mtx); | |
3784 | zio_nowait(zio); | |
3785 | } | |
3786 | ||
d1d7e268 MK |
3787 | /* |
3788 | * dbuf_sync_leaf() is called recursively from dbuf_sync_list() so it is | |
60948de1 BB |
3789 | * critical the we not allow the compiler to inline this function in to |
3790 | * dbuf_sync_list() thereby drastically bloating the stack usage. | |
3791 | */ | |
3792 | noinline static void | |
34dc7c2f BB |
3793 | dbuf_sync_leaf(dbuf_dirty_record_t *dr, dmu_tx_t *tx) |
3794 | { | |
3795 | arc_buf_t **datap = &dr->dt.dl.dr_data; | |
3796 | dmu_buf_impl_t *db = dr->dr_dbuf; | |
572e2857 BB |
3797 | dnode_t *dn; |
3798 | objset_t *os; | |
34dc7c2f | 3799 | uint64_t txg = tx->tx_txg; |
34dc7c2f BB |
3800 | |
3801 | ASSERT(dmu_tx_is_syncing(tx)); | |
3802 | ||
3803 | dprintf_dbuf_bp(db, db->db_blkptr, "blkptr=%p", db->db_blkptr); | |
3804 | ||
3805 | mutex_enter(&db->db_mtx); | |
3806 | /* | |
3807 | * To be synced, we must be dirtied. But we | |
3808 | * might have been freed after the dirty. | |
3809 | */ | |
3810 | if (db->db_state == DB_UNCACHED) { | |
3811 | /* This buffer has been freed since it was dirtied */ | |
3812 | ASSERT(db->db.db_data == NULL); | |
3813 | } else if (db->db_state == DB_FILL) { | |
3814 | /* This buffer was freed and is now being re-filled */ | |
3815 | ASSERT(db->db.db_data != dr->dt.dl.dr_data); | |
3816 | } else { | |
b128c09f | 3817 | ASSERT(db->db_state == DB_CACHED || db->db_state == DB_NOFILL); |
34dc7c2f BB |
3818 | } |
3819 | DBUF_VERIFY(db); | |
3820 | ||
572e2857 BB |
3821 | DB_DNODE_ENTER(db); |
3822 | dn = DB_DNODE(db); | |
3823 | ||
428870ff BB |
3824 | if (db->db_blkid == DMU_SPILL_BLKID) { |
3825 | mutex_enter(&dn->dn_mtx); | |
81edd3e8 P |
3826 | if (!(dn->dn_phys->dn_flags & DNODE_FLAG_SPILL_BLKPTR)) { |
3827 | /* | |
3828 | * In the previous transaction group, the bonus buffer | |
3829 | * was entirely used to store the attributes for the | |
3830 | * dnode which overrode the dn_spill field. However, | |
3831 | * when adding more attributes to the file a spill | |
3832 | * block was required to hold the extra attributes. | |
3833 | * | |
3834 | * Make sure to clear the garbage left in the dn_spill | |
3835 | * field from the previous attributes in the bonus | |
3836 | * buffer. Otherwise, after writing out the spill | |
3837 | * block to the new allocated dva, it will free | |
3838 | * the old block pointed to by the invalid dn_spill. | |
3839 | */ | |
3840 | db->db_blkptr = NULL; | |
3841 | } | |
428870ff BB |
3842 | dn->dn_phys->dn_flags |= DNODE_FLAG_SPILL_BLKPTR; |
3843 | mutex_exit(&dn->dn_mtx); | |
3844 | } | |
3845 | ||
34dc7c2f BB |
3846 | /* |
3847 | * If this is a bonus buffer, simply copy the bonus data into the | |
3848 | * dnode. It will be written out when the dnode is synced (and it | |
3849 | * will be synced, since it must have been dirty for dbuf_sync to | |
3850 | * be called). | |
3851 | */ | |
428870ff | 3852 | if (db->db_blkid == DMU_BONUS_BLKID) { |
34dc7c2f BB |
3853 | dbuf_dirty_record_t **drp; |
3854 | ||
3855 | ASSERT(*datap != NULL); | |
c99c9001 | 3856 | ASSERT0(db->db_level); |
b5256303 | 3857 | ASSERT3U(DN_MAX_BONUS_LEN(dn->dn_phys), <=, |
50c957f7 | 3858 | DN_SLOTS_TO_BONUSLEN(dn->dn_phys->dn_extra_slots + 1)); |
b5256303 TC |
3859 | bcopy(*datap, DN_BONUS(dn->dn_phys), |
3860 | DN_MAX_BONUS_LEN(dn->dn_phys)); | |
572e2857 BB |
3861 | DB_DNODE_EXIT(db); |
3862 | ||
34dc7c2f | 3863 | if (*datap != db->db.db_data) { |
50c957f7 NB |
3864 | int slots = DB_DNODE(db)->dn_num_slots; |
3865 | int bonuslen = DN_SLOTS_TO_BONUSLEN(slots); | |
a3fd9d9e | 3866 | kmem_free(*datap, bonuslen); |
25458cbe | 3867 | arc_space_return(bonuslen, ARC_SPACE_BONUS); |
34dc7c2f BB |
3868 | } |
3869 | db->db_data_pending = NULL; | |
3870 | drp = &db->db_last_dirty; | |
3871 | while (*drp != dr) | |
3872 | drp = &(*drp)->dr_next; | |
3873 | ASSERT(dr->dr_next == NULL); | |
428870ff | 3874 | ASSERT(dr->dr_dbuf == db); |
34dc7c2f | 3875 | *drp = dr->dr_next; |
753972fc BB |
3876 | if (dr->dr_dbuf->db_level != 0) { |
3877 | mutex_destroy(&dr->dt.di.dr_mtx); | |
3878 | list_destroy(&dr->dt.di.dr_children); | |
3879 | } | |
34dc7c2f BB |
3880 | kmem_free(dr, sizeof (dbuf_dirty_record_t)); |
3881 | ASSERT(db->db_dirtycnt > 0); | |
3882 | db->db_dirtycnt -= 1; | |
3d503a76 | 3883 | dbuf_rele_and_unlock(db, (void *)(uintptr_t)txg, B_FALSE); |
34dc7c2f BB |
3884 | return; |
3885 | } | |
3886 | ||
572e2857 BB |
3887 | os = dn->dn_objset; |
3888 | ||
34dc7c2f BB |
3889 | /* |
3890 | * This function may have dropped the db_mtx lock allowing a dmu_sync | |
3891 | * operation to sneak in. As a result, we need to ensure that we | |
3892 | * don't check the dr_override_state until we have returned from | |
3893 | * dbuf_check_blkptr. | |
3894 | */ | |
3895 | dbuf_check_blkptr(dn, db); | |
3896 | ||
3897 | /* | |
572e2857 | 3898 | * If this buffer is in the middle of an immediate write, |
34dc7c2f BB |
3899 | * wait for the synchronous IO to complete. |
3900 | */ | |
3901 | while (dr->dt.dl.dr_override_state == DR_IN_DMU_SYNC) { | |
3902 | ASSERT(dn->dn_object != DMU_META_DNODE_OBJECT); | |
3903 | cv_wait(&db->db_changed, &db->db_mtx); | |
3904 | ASSERT(dr->dt.dl.dr_override_state != DR_NOT_OVERRIDDEN); | |
3905 | } | |
3906 | ||
b5256303 TC |
3907 | /* |
3908 | * If this is a dnode block, ensure it is appropriately encrypted | |
3909 | * or decrypted, depending on what we are writing to it this txg. | |
3910 | */ | |
3911 | if (os->os_encrypted && dn->dn_object == DMU_META_DNODE_OBJECT) | |
0c03d21a | 3912 | dbuf_prepare_encrypted_dnode_leaf(dr); |
b5256303 | 3913 | |
9babb374 BB |
3914 | if (db->db_state != DB_NOFILL && |
3915 | dn->dn_object != DMU_META_DNODE_OBJECT && | |
424fd7c3 | 3916 | zfs_refcount_count(&db->db_holds) > 1 && |
428870ff | 3917 | dr->dt.dl.dr_override_state != DR_OVERRIDDEN && |
9babb374 BB |
3918 | *datap == db->db_buf) { |
3919 | /* | |
3920 | * If this buffer is currently "in use" (i.e., there | |
3921 | * are active holds and db_data still references it), | |
3922 | * then make a copy before we start the write so that | |
3923 | * any modifications from the open txg will not leak | |
3924 | * into this write. | |
3925 | * | |
3926 | * NOTE: this copy does not need to be made for | |
3927 | * objects only modified in the syncing context (e.g. | |
3928 | * DNONE_DNODE blocks). | |
3929 | */ | |
2aa34383 | 3930 | int psize = arc_buf_size(*datap); |
b5256303 | 3931 | int lsize = arc_buf_lsize(*datap); |
9babb374 | 3932 | arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); |
2aa34383 DK |
3933 | enum zio_compress compress_type = arc_get_compression(*datap); |
3934 | ||
b5256303 TC |
3935 | if (arc_is_encrypted(*datap)) { |
3936 | boolean_t byteorder; | |
3937 | uint8_t salt[ZIO_DATA_SALT_LEN]; | |
3938 | uint8_t iv[ZIO_DATA_IV_LEN]; | |
3939 | uint8_t mac[ZIO_DATA_MAC_LEN]; | |
3940 | ||
3941 | arc_get_raw_params(*datap, &byteorder, salt, iv, mac); | |
3942 | *datap = arc_alloc_raw_buf(os->os_spa, db, | |
3943 | dmu_objset_id(os), byteorder, salt, iv, mac, | |
3944 | dn->dn_type, psize, lsize, compress_type); | |
3945 | } else if (compress_type != ZIO_COMPRESS_OFF) { | |
2aa34383 DK |
3946 | ASSERT3U(type, ==, ARC_BUFC_DATA); |
3947 | *datap = arc_alloc_compressed_buf(os->os_spa, db, | |
3948 | psize, lsize, compress_type); | |
b5256303 TC |
3949 | } else { |
3950 | *datap = arc_alloc_buf(os->os_spa, db, type, psize); | |
2aa34383 DK |
3951 | } |
3952 | bcopy(db->db.db_data, (*datap)->b_data, psize); | |
b128c09f | 3953 | } |
34dc7c2f BB |
3954 | db->db_data_pending = dr; |
3955 | ||
3956 | mutex_exit(&db->db_mtx); | |
3957 | ||
b128c09f | 3958 | dbuf_write(dr, *datap, tx); |
34dc7c2f BB |
3959 | |
3960 | ASSERT(!list_link_active(&dr->dr_dirty_node)); | |
572e2857 | 3961 | if (dn->dn_object == DMU_META_DNODE_OBJECT) { |
3fa93bb8 | 3962 | list_insert_tail(&dn->dn_dirty_records[txg & TXG_MASK], dr); |
572e2857 BB |
3963 | DB_DNODE_EXIT(db); |
3964 | } else { | |
3965 | /* | |
3966 | * Although zio_nowait() does not "wait for an IO", it does | |
3967 | * initiate the IO. If this is an empty write it seems plausible | |
3968 | * that the IO could actually be completed before the nowait | |
3969 | * returns. We need to DB_DNODE_EXIT() first in case | |
3970 | * zio_nowait() invalidates the dbuf. | |
3971 | */ | |
3972 | DB_DNODE_EXIT(db); | |
34dc7c2f | 3973 | zio_nowait(dr->dr_zio); |
572e2857 | 3974 | } |
34dc7c2f BB |
3975 | } |
3976 | ||
3977 | void | |
4bda3bd0 | 3978 | dbuf_sync_list(list_t *list, int level, dmu_tx_t *tx) |
34dc7c2f BB |
3979 | { |
3980 | dbuf_dirty_record_t *dr; | |
3981 | ||
c65aa5b2 | 3982 | while ((dr = list_head(list))) { |
34dc7c2f BB |
3983 | if (dr->dr_zio != NULL) { |
3984 | /* | |
3985 | * If we find an already initialized zio then we | |
3986 | * are processing the meta-dnode, and we have finished. | |
3987 | * The dbufs for all dnodes are put back on the list | |
3988 | * during processing, so that we can zio_wait() | |
3989 | * these IOs after initiating all child IOs. | |
3990 | */ | |
3991 | ASSERT3U(dr->dr_dbuf->db.db_object, ==, | |
3992 | DMU_META_DNODE_OBJECT); | |
3993 | break; | |
3994 | } | |
4bda3bd0 MA |
3995 | if (dr->dr_dbuf->db_blkid != DMU_BONUS_BLKID && |
3996 | dr->dr_dbuf->db_blkid != DMU_SPILL_BLKID) { | |
3997 | VERIFY3U(dr->dr_dbuf->db_level, ==, level); | |
3998 | } | |
34dc7c2f BB |
3999 | list_remove(list, dr); |
4000 | if (dr->dr_dbuf->db_level > 0) | |
4001 | dbuf_sync_indirect(dr, tx); | |
4002 | else | |
4003 | dbuf_sync_leaf(dr, tx); | |
4004 | } | |
4005 | } | |
4006 | ||
34dc7c2f BB |
4007 | /* ARGSUSED */ |
4008 | static void | |
4009 | dbuf_write_ready(zio_t *zio, arc_buf_t *buf, void *vdb) | |
4010 | { | |
4011 | dmu_buf_impl_t *db = vdb; | |
572e2857 | 4012 | dnode_t *dn; |
b128c09f | 4013 | blkptr_t *bp = zio->io_bp; |
34dc7c2f | 4014 | blkptr_t *bp_orig = &zio->io_bp_orig; |
428870ff BB |
4015 | spa_t *spa = zio->io_spa; |
4016 | int64_t delta; | |
34dc7c2f | 4017 | uint64_t fill = 0; |
428870ff | 4018 | int i; |
34dc7c2f | 4019 | |
463a8cfe AR |
4020 | ASSERT3P(db->db_blkptr, !=, NULL); |
4021 | ASSERT3P(&db->db_data_pending->dr_bp_copy, ==, bp); | |
b128c09f | 4022 | |
572e2857 BB |
4023 | DB_DNODE_ENTER(db); |
4024 | dn = DB_DNODE(db); | |
428870ff BB |
4025 | delta = bp_get_dsize_sync(spa, bp) - bp_get_dsize_sync(spa, bp_orig); |
4026 | dnode_diduse_space(dn, delta - zio->io_prev_space_delta); | |
4027 | zio->io_prev_space_delta = delta; | |
34dc7c2f | 4028 | |
b0bc7a84 MG |
4029 | if (bp->blk_birth != 0) { |
4030 | ASSERT((db->db_blkid != DMU_SPILL_BLKID && | |
4031 | BP_GET_TYPE(bp) == dn->dn_type) || | |
4032 | (db->db_blkid == DMU_SPILL_BLKID && | |
9b67f605 MA |
4033 | BP_GET_TYPE(bp) == dn->dn_bonustype) || |
4034 | BP_IS_EMBEDDED(bp)); | |
b0bc7a84 | 4035 | ASSERT(BP_GET_LEVEL(bp) == db->db_level); |
34dc7c2f BB |
4036 | } |
4037 | ||
4038 | mutex_enter(&db->db_mtx); | |
4039 | ||
428870ff BB |
4040 | #ifdef ZFS_DEBUG |
4041 | if (db->db_blkid == DMU_SPILL_BLKID) { | |
428870ff | 4042 | ASSERT(dn->dn_phys->dn_flags & DNODE_FLAG_SPILL_BLKPTR); |
463a8cfe | 4043 | ASSERT(!(BP_IS_HOLE(bp)) && |
50c957f7 | 4044 | db->db_blkptr == DN_SPILL_BLKPTR(dn->dn_phys)); |
428870ff BB |
4045 | } |
4046 | #endif | |
4047 | ||
34dc7c2f BB |
4048 | if (db->db_level == 0) { |
4049 | mutex_enter(&dn->dn_mtx); | |
428870ff | 4050 | if (db->db_blkid > dn->dn_phys->dn_maxblkid && |
69830602 TC |
4051 | db->db_blkid != DMU_SPILL_BLKID) { |
4052 | ASSERT0(db->db_objset->os_raw_receive); | |
34dc7c2f | 4053 | dn->dn_phys->dn_maxblkid = db->db_blkid; |
69830602 | 4054 | } |
34dc7c2f BB |
4055 | mutex_exit(&dn->dn_mtx); |
4056 | ||
4057 | if (dn->dn_type == DMU_OT_DNODE) { | |
50c957f7 NB |
4058 | i = 0; |
4059 | while (i < db->db.db_size) { | |
817b1b6e MA |
4060 | dnode_phys_t *dnp = |
4061 | (void *)(((char *)db->db.db_data) + i); | |
50c957f7 NB |
4062 | |
4063 | i += DNODE_MIN_SIZE; | |
4064 | if (dnp->dn_type != DMU_OT_NONE) { | |
34dc7c2f | 4065 | fill++; |
50c957f7 NB |
4066 | i += dnp->dn_extra_slots * |
4067 | DNODE_MIN_SIZE; | |
4068 | } | |
34dc7c2f BB |
4069 | } |
4070 | } else { | |
b0bc7a84 MG |
4071 | if (BP_IS_HOLE(bp)) { |
4072 | fill = 0; | |
4073 | } else { | |
4074 | fill = 1; | |
4075 | } | |
34dc7c2f BB |
4076 | } |
4077 | } else { | |
b128c09f | 4078 | blkptr_t *ibp = db->db.db_data; |
34dc7c2f | 4079 | ASSERT3U(db->db.db_size, ==, 1<<dn->dn_phys->dn_indblkshift); |
b128c09f BB |
4080 | for (i = db->db.db_size >> SPA_BLKPTRSHIFT; i > 0; i--, ibp++) { |
4081 | if (BP_IS_HOLE(ibp)) | |
34dc7c2f | 4082 | continue; |
9b67f605 | 4083 | fill += BP_GET_FILL(ibp); |
34dc7c2f BB |
4084 | } |
4085 | } | |
572e2857 | 4086 | DB_DNODE_EXIT(db); |
34dc7c2f | 4087 | |
9b67f605 | 4088 | if (!BP_IS_EMBEDDED(bp)) |
b5256303 | 4089 | BP_SET_FILL(bp, fill); |
34dc7c2f BB |
4090 | |
4091 | mutex_exit(&db->db_mtx); | |
463a8cfe AR |
4092 | |
4093 | rw_enter(&dn->dn_struct_rwlock, RW_WRITER); | |
4094 | *db->db_blkptr = *bp; | |
4095 | rw_exit(&dn->dn_struct_rwlock); | |
34dc7c2f BB |
4096 | } |
4097 | ||
bc77ba73 PD |
4098 | /* ARGSUSED */ |
4099 | /* | |
4100 | * This function gets called just prior to running through the compression | |
4101 | * stage of the zio pipeline. If we're an indirect block comprised of only | |
4102 | * holes, then we want this indirect to be compressed away to a hole. In | |
4103 | * order to do that we must zero out any information about the holes that | |
4104 | * this indirect points to prior to before we try to compress it. | |
4105 | */ | |
4106 | static void | |
4107 | dbuf_write_children_ready(zio_t *zio, arc_buf_t *buf, void *vdb) | |
4108 | { | |
4109 | dmu_buf_impl_t *db = vdb; | |
4110 | dnode_t *dn; | |
4111 | blkptr_t *bp; | |
721ed0ee | 4112 | unsigned int epbs, i; |
bc77ba73 PD |
4113 | |
4114 | ASSERT3U(db->db_level, >, 0); | |
4115 | DB_DNODE_ENTER(db); | |
4116 | dn = DB_DNODE(db); | |
4117 | epbs = dn->dn_phys->dn_indblkshift - SPA_BLKPTRSHIFT; | |
721ed0ee | 4118 | ASSERT3U(epbs, <, 31); |
bc77ba73 PD |
4119 | |
4120 | /* Determine if all our children are holes */ | |
3f93077b | 4121 | for (i = 0, bp = db->db.db_data; i < 1ULL << epbs; i++, bp++) { |
bc77ba73 PD |
4122 | if (!BP_IS_HOLE(bp)) |
4123 | break; | |
4124 | } | |
4125 | ||
4126 | /* | |
4127 | * If all the children are holes, then zero them all out so that | |
4128 | * we may get compressed away. | |
4129 | */ | |
3f93077b | 4130 | if (i == 1ULL << epbs) { |
721ed0ee GM |
4131 | /* |
4132 | * We only found holes. Grab the rwlock to prevent | |
4133 | * anybody from reading the blocks we're about to | |
4134 | * zero out. | |
4135 | */ | |
4136 | rw_enter(&dn->dn_struct_rwlock, RW_WRITER); | |
bc77ba73 | 4137 | bzero(db->db.db_data, db->db.db_size); |
721ed0ee | 4138 | rw_exit(&dn->dn_struct_rwlock); |
bc77ba73 PD |
4139 | } |
4140 | DB_DNODE_EXIT(db); | |
4141 | } | |
4142 | ||
e8b96c60 MA |
4143 | /* |
4144 | * The SPA will call this callback several times for each zio - once | |
4145 | * for every physical child i/o (zio->io_phys_children times). This | |
4146 | * allows the DMU to monitor the progress of each logical i/o. For example, | |
4147 | * there may be 2 copies of an indirect block, or many fragments of a RAID-Z | |
4148 | * block. There may be a long delay before all copies/fragments are completed, | |
4149 | * so this callback allows us to retire dirty space gradually, as the physical | |
4150 | * i/os complete. | |
4151 | */ | |
4152 | /* ARGSUSED */ | |
4153 | static void | |
4154 | dbuf_write_physdone(zio_t *zio, arc_buf_t *buf, void *arg) | |
4155 | { | |
4156 | dmu_buf_impl_t *db = arg; | |
4157 | objset_t *os = db->db_objset; | |
4158 | dsl_pool_t *dp = dmu_objset_pool(os); | |
4159 | dbuf_dirty_record_t *dr; | |
4160 | int delta = 0; | |
4161 | ||
4162 | dr = db->db_data_pending; | |
4163 | ASSERT3U(dr->dr_txg, ==, zio->io_txg); | |
4164 | ||
4165 | /* | |
4166 | * The callback will be called io_phys_children times. Retire one | |
4167 | * portion of our dirty space each time we are called. Any rounding | |
4168 | * error will be cleaned up by dsl_pool_sync()'s call to | |
4169 | * dsl_pool_undirty_space(). | |
4170 | */ | |
4171 | delta = dr->dr_accounted / zio->io_phys_children; | |
4172 | dsl_pool_undirty_space(dp, delta, zio->io_txg); | |
4173 | } | |
4174 | ||
34dc7c2f BB |
4175 | /* ARGSUSED */ |
4176 | static void | |
4177 | dbuf_write_done(zio_t *zio, arc_buf_t *buf, void *vdb) | |
4178 | { | |
4179 | dmu_buf_impl_t *db = vdb; | |
428870ff | 4180 | blkptr_t *bp_orig = &zio->io_bp_orig; |
b0bc7a84 MG |
4181 | blkptr_t *bp = db->db_blkptr; |
4182 | objset_t *os = db->db_objset; | |
4183 | dmu_tx_t *tx = os->os_synctx; | |
34dc7c2f BB |
4184 | dbuf_dirty_record_t **drp, *dr; |
4185 | ||
c99c9001 | 4186 | ASSERT0(zio->io_error); |
428870ff BB |
4187 | ASSERT(db->db_blkptr == bp); |
4188 | ||
03c6040b GW |
4189 | /* |
4190 | * For nopwrites and rewrites we ensure that the bp matches our | |
4191 | * original and bypass all the accounting. | |
4192 | */ | |
4193 | if (zio->io_flags & (ZIO_FLAG_IO_REWRITE | ZIO_FLAG_NOPWRITE)) { | |
428870ff BB |
4194 | ASSERT(BP_EQUAL(bp, bp_orig)); |
4195 | } else { | |
b0bc7a84 | 4196 | dsl_dataset_t *ds = os->os_dsl_dataset; |
428870ff BB |
4197 | (void) dsl_dataset_block_kill(ds, bp_orig, tx, B_TRUE); |
4198 | dsl_dataset_block_born(ds, bp, tx); | |
4199 | } | |
34dc7c2f BB |
4200 | |
4201 | mutex_enter(&db->db_mtx); | |
4202 | ||
428870ff BB |
4203 | DBUF_VERIFY(db); |
4204 | ||
34dc7c2f BB |
4205 | drp = &db->db_last_dirty; |
4206 | while ((dr = *drp) != db->db_data_pending) | |
4207 | drp = &dr->dr_next; | |
4208 | ASSERT(!list_link_active(&dr->dr_dirty_node)); | |
428870ff | 4209 | ASSERT(dr->dr_dbuf == db); |
34dc7c2f BB |
4210 | ASSERT(dr->dr_next == NULL); |
4211 | *drp = dr->dr_next; | |
4212 | ||
428870ff BB |
4213 | #ifdef ZFS_DEBUG |
4214 | if (db->db_blkid == DMU_SPILL_BLKID) { | |
572e2857 BB |
4215 | dnode_t *dn; |
4216 | ||
4217 | DB_DNODE_ENTER(db); | |
4218 | dn = DB_DNODE(db); | |
428870ff BB |
4219 | ASSERT(dn->dn_phys->dn_flags & DNODE_FLAG_SPILL_BLKPTR); |
4220 | ASSERT(!(BP_IS_HOLE(db->db_blkptr)) && | |
50c957f7 | 4221 | db->db_blkptr == DN_SPILL_BLKPTR(dn->dn_phys)); |
572e2857 | 4222 | DB_DNODE_EXIT(db); |
428870ff BB |
4223 | } |
4224 | #endif | |
4225 | ||
34dc7c2f | 4226 | if (db->db_level == 0) { |
428870ff | 4227 | ASSERT(db->db_blkid != DMU_BONUS_BLKID); |
34dc7c2f | 4228 | ASSERT(dr->dt.dl.dr_override_state == DR_NOT_OVERRIDDEN); |
b128c09f BB |
4229 | if (db->db_state != DB_NOFILL) { |
4230 | if (dr->dt.dl.dr_data != db->db_buf) | |
d3c2ae1c | 4231 | arc_buf_destroy(dr->dt.dl.dr_data, db); |
b128c09f | 4232 | } |
34dc7c2f | 4233 | } else { |
572e2857 BB |
4234 | dnode_t *dn; |
4235 | ||
4236 | DB_DNODE_ENTER(db); | |
4237 | dn = DB_DNODE(db); | |
34dc7c2f | 4238 | ASSERT(list_head(&dr->dt.di.dr_children) == NULL); |
b0bc7a84 | 4239 | ASSERT3U(db->db.db_size, ==, 1 << dn->dn_phys->dn_indblkshift); |
34dc7c2f | 4240 | if (!BP_IS_HOLE(db->db_blkptr)) { |
1fde1e37 BB |
4241 | ASSERTV(int epbs = dn->dn_phys->dn_indblkshift - |
4242 | SPA_BLKPTRSHIFT); | |
b0bc7a84 MG |
4243 | ASSERT3U(db->db_blkid, <=, |
4244 | dn->dn_phys->dn_maxblkid >> (db->db_level * epbs)); | |
34dc7c2f BB |
4245 | ASSERT3U(BP_GET_LSIZE(db->db_blkptr), ==, |
4246 | db->db.db_size); | |
34dc7c2f | 4247 | } |
572e2857 | 4248 | DB_DNODE_EXIT(db); |
34dc7c2f BB |
4249 | mutex_destroy(&dr->dt.di.dr_mtx); |
4250 | list_destroy(&dr->dt.di.dr_children); | |
4251 | } | |
4252 | kmem_free(dr, sizeof (dbuf_dirty_record_t)); | |
4253 | ||
4254 | cv_broadcast(&db->db_changed); | |
4255 | ASSERT(db->db_dirtycnt > 0); | |
4256 | db->db_dirtycnt -= 1; | |
4257 | db->db_data_pending = NULL; | |
3d503a76 | 4258 | dbuf_rele_and_unlock(db, (void *)(uintptr_t)tx->tx_txg, B_FALSE); |
428870ff BB |
4259 | } |
4260 | ||
4261 | static void | |
4262 | dbuf_write_nofill_ready(zio_t *zio) | |
4263 | { | |
4264 | dbuf_write_ready(zio, NULL, zio->io_private); | |
4265 | } | |
4266 | ||
4267 | static void | |
4268 | dbuf_write_nofill_done(zio_t *zio) | |
4269 | { | |
4270 | dbuf_write_done(zio, NULL, zio->io_private); | |
4271 | } | |
4272 | ||
4273 | static void | |
4274 | dbuf_write_override_ready(zio_t *zio) | |
4275 | { | |
4276 | dbuf_dirty_record_t *dr = zio->io_private; | |
4277 | dmu_buf_impl_t *db = dr->dr_dbuf; | |
4278 | ||
4279 | dbuf_write_ready(zio, NULL, db); | |
4280 | } | |
4281 | ||
4282 | static void | |
4283 | dbuf_write_override_done(zio_t *zio) | |
4284 | { | |
4285 | dbuf_dirty_record_t *dr = zio->io_private; | |
4286 | dmu_buf_impl_t *db = dr->dr_dbuf; | |
4287 | blkptr_t *obp = &dr->dt.dl.dr_overridden_by; | |
4288 | ||
4289 | mutex_enter(&db->db_mtx); | |
4290 | if (!BP_EQUAL(zio->io_bp, obp)) { | |
4291 | if (!BP_IS_HOLE(obp)) | |
4292 | dsl_free(spa_get_dsl(zio->io_spa), zio->io_txg, obp); | |
4293 | arc_release(dr->dt.dl.dr_data, db); | |
4294 | } | |
34dc7c2f BB |
4295 | mutex_exit(&db->db_mtx); |
4296 | ||
428870ff | 4297 | dbuf_write_done(zio, NULL, db); |
a6255b7f DQ |
4298 | |
4299 | if (zio->io_abd != NULL) | |
4300 | abd_put(zio->io_abd); | |
428870ff BB |
4301 | } |
4302 | ||
a1d477c2 MA |
4303 | typedef struct dbuf_remap_impl_callback_arg { |
4304 | objset_t *drica_os; | |
4305 | uint64_t drica_blk_birth; | |
4306 | dmu_tx_t *drica_tx; | |
4307 | } dbuf_remap_impl_callback_arg_t; | |
4308 | ||
4309 | static void | |
4310 | dbuf_remap_impl_callback(uint64_t vdev, uint64_t offset, uint64_t size, | |
4311 | void *arg) | |
4312 | { | |
4313 | dbuf_remap_impl_callback_arg_t *drica = arg; | |
4314 | objset_t *os = drica->drica_os; | |
4315 | spa_t *spa = dmu_objset_spa(os); | |
4316 | dmu_tx_t *tx = drica->drica_tx; | |
4317 | ||
4318 | ASSERT(dsl_pool_sync_context(spa_get_dsl(spa))); | |
4319 | ||
4320 | if (os == spa_meta_objset(spa)) { | |
4321 | spa_vdev_indirect_mark_obsolete(spa, vdev, offset, size, tx); | |
4322 | } else { | |
4323 | dsl_dataset_block_remapped(dmu_objset_ds(os), vdev, offset, | |
4324 | size, drica->drica_blk_birth, tx); | |
4325 | } | |
4326 | } | |
4327 | ||
4328 | static void | |
4329 | dbuf_remap_impl(dnode_t *dn, blkptr_t *bp, dmu_tx_t *tx) | |
4330 | { | |
4331 | blkptr_t bp_copy = *bp; | |
4332 | spa_t *spa = dmu_objset_spa(dn->dn_objset); | |
4333 | dbuf_remap_impl_callback_arg_t drica; | |
4334 | ||
4335 | ASSERT(dsl_pool_sync_context(spa_get_dsl(spa))); | |
4336 | ||
4337 | drica.drica_os = dn->dn_objset; | |
4338 | drica.drica_blk_birth = bp->blk_birth; | |
4339 | drica.drica_tx = tx; | |
4340 | if (spa_remap_blkptr(spa, &bp_copy, dbuf_remap_impl_callback, | |
4341 | &drica)) { | |
4342 | /* | |
4343 | * The struct_rwlock prevents dbuf_read_impl() from | |
4344 | * dereferencing the BP while we are changing it. To | |
4345 | * avoid lock contention, only grab it when we are actually | |
4346 | * changing the BP. | |
4347 | */ | |
4348 | rw_enter(&dn->dn_struct_rwlock, RW_WRITER); | |
4349 | *bp = bp_copy; | |
4350 | rw_exit(&dn->dn_struct_rwlock); | |
4351 | } | |
4352 | } | |
4353 | ||
4354 | /* | |
4355 | * Returns true if a dbuf_remap would modify the dbuf. We do this by attempting | |
4356 | * to remap a copy of every bp in the dbuf. | |
4357 | */ | |
4358 | boolean_t | |
4359 | dbuf_can_remap(const dmu_buf_impl_t *db) | |
4360 | { | |
4361 | spa_t *spa = dmu_objset_spa(db->db_objset); | |
4362 | blkptr_t *bp = db->db.db_data; | |
4363 | boolean_t ret = B_FALSE; | |
4364 | ||
4365 | ASSERT3U(db->db_level, >, 0); | |
4366 | ASSERT3S(db->db_state, ==, DB_CACHED); | |
4367 | ||
4368 | ASSERT(spa_feature_is_active(spa, SPA_FEATURE_DEVICE_REMOVAL)); | |
4369 | ||
4370 | spa_config_enter(spa, SCL_VDEV, FTAG, RW_READER); | |
4371 | for (int i = 0; i < db->db.db_size >> SPA_BLKPTRSHIFT; i++) { | |
4372 | blkptr_t bp_copy = bp[i]; | |
4373 | if (spa_remap_blkptr(spa, &bp_copy, NULL, NULL)) { | |
4374 | ret = B_TRUE; | |
4375 | break; | |
4376 | } | |
4377 | } | |
4378 | spa_config_exit(spa, SCL_VDEV, FTAG); | |
4379 | ||
4380 | return (ret); | |
4381 | } | |
4382 | ||
4383 | boolean_t | |
4384 | dnode_needs_remap(const dnode_t *dn) | |
4385 | { | |
4386 | spa_t *spa = dmu_objset_spa(dn->dn_objset); | |
4387 | boolean_t ret = B_FALSE; | |
4388 | ||
4389 | if (dn->dn_phys->dn_nlevels == 0) { | |
4390 | return (B_FALSE); | |
4391 | } | |
4392 | ||
4393 | ASSERT(spa_feature_is_active(spa, SPA_FEATURE_DEVICE_REMOVAL)); | |
4394 | ||
4395 | spa_config_enter(spa, SCL_VDEV, FTAG, RW_READER); | |
4396 | for (int j = 0; j < dn->dn_phys->dn_nblkptr; j++) { | |
4397 | blkptr_t bp_copy = dn->dn_phys->dn_blkptr[j]; | |
4398 | if (spa_remap_blkptr(spa, &bp_copy, NULL, NULL)) { | |
4399 | ret = B_TRUE; | |
4400 | break; | |
4401 | } | |
4402 | } | |
4403 | spa_config_exit(spa, SCL_VDEV, FTAG); | |
4404 | ||
4405 | return (ret); | |
4406 | } | |
4407 | ||
4408 | /* | |
4409 | * Remap any existing BP's to concrete vdevs, if possible. | |
4410 | */ | |
4411 | static void | |
4412 | dbuf_remap(dnode_t *dn, dmu_buf_impl_t *db, dmu_tx_t *tx) | |
4413 | { | |
4414 | spa_t *spa = dmu_objset_spa(db->db_objset); | |
4415 | ASSERT(dsl_pool_sync_context(spa_get_dsl(spa))); | |
4416 | ||
4417 | if (!spa_feature_is_active(spa, SPA_FEATURE_DEVICE_REMOVAL)) | |
4418 | return; | |
4419 | ||
4420 | if (db->db_level > 0) { | |
4421 | blkptr_t *bp = db->db.db_data; | |
4422 | for (int i = 0; i < db->db.db_size >> SPA_BLKPTRSHIFT; i++) { | |
4423 | dbuf_remap_impl(dn, &bp[i], tx); | |
4424 | } | |
4425 | } else if (db->db.db_object == DMU_META_DNODE_OBJECT) { | |
4426 | dnode_phys_t *dnp = db->db.db_data; | |
4427 | ASSERT3U(db->db_dnode_handle->dnh_dnode->dn_type, ==, | |
4428 | DMU_OT_DNODE); | |
4429 | for (int i = 0; i < db->db.db_size >> DNODE_SHIFT; | |
4430 | i += dnp[i].dn_extra_slots + 1) { | |
4431 | for (int j = 0; j < dnp[i].dn_nblkptr; j++) { | |
4432 | dbuf_remap_impl(dn, &dnp[i].dn_blkptr[j], tx); | |
4433 | } | |
4434 | } | |
4435 | } | |
4436 | } | |
4437 | ||
4438 | ||
e49f1e20 | 4439 | /* Issue I/O to commit a dirty buffer to disk. */ |
428870ff BB |
4440 | static void |
4441 | dbuf_write(dbuf_dirty_record_t *dr, arc_buf_t *data, dmu_tx_t *tx) | |
4442 | { | |
4443 | dmu_buf_impl_t *db = dr->dr_dbuf; | |
572e2857 BB |
4444 | dnode_t *dn; |
4445 | objset_t *os; | |
428870ff BB |
4446 | dmu_buf_impl_t *parent = db->db_parent; |
4447 | uint64_t txg = tx->tx_txg; | |
5dbd68a3 | 4448 | zbookmark_phys_t zb; |
428870ff BB |
4449 | zio_prop_t zp; |
4450 | zio_t *zio; | |
4451 | int wp_flag = 0; | |
34dc7c2f | 4452 | |
463a8cfe AR |
4453 | ASSERT(dmu_tx_is_syncing(tx)); |
4454 | ||
572e2857 BB |
4455 | DB_DNODE_ENTER(db); |
4456 | dn = DB_DNODE(db); | |
4457 | os = dn->dn_objset; | |
4458 | ||
428870ff BB |
4459 | if (db->db_state != DB_NOFILL) { |
4460 | if (db->db_level > 0 || dn->dn_type == DMU_OT_DNODE) { | |
4461 | /* | |
4462 | * Private object buffers are released here rather | |
4463 | * than in dbuf_dirty() since they are only modified | |
4464 | * in the syncing context and we don't want the | |
4465 | * overhead of making multiple copies of the data. | |
4466 | */ | |
4467 | if (BP_IS_HOLE(db->db_blkptr)) { | |
4468 | arc_buf_thaw(data); | |
4469 | } else { | |
4470 | dbuf_release_bp(db); | |
4471 | } | |
a1d477c2 | 4472 | dbuf_remap(dn, db, tx); |
428870ff BB |
4473 | } |
4474 | } | |
4475 | ||
4476 | if (parent != dn->dn_dbuf) { | |
e49f1e20 WA |
4477 | /* Our parent is an indirect block. */ |
4478 | /* We have a dirty parent that has been scheduled for write. */ | |
428870ff | 4479 | ASSERT(parent && parent->db_data_pending); |
e49f1e20 | 4480 | /* Our parent's buffer is one level closer to the dnode. */ |
428870ff | 4481 | ASSERT(db->db_level == parent->db_level-1); |
e49f1e20 WA |
4482 | /* |
4483 | * We're about to modify our parent's db_data by modifying | |
4484 | * our block pointer, so the parent must be released. | |
4485 | */ | |
428870ff BB |
4486 | ASSERT(arc_released(parent->db_buf)); |
4487 | zio = parent->db_data_pending->dr_zio; | |
4488 | } else { | |
e49f1e20 | 4489 | /* Our parent is the dnode itself. */ |
428870ff BB |
4490 | ASSERT((db->db_level == dn->dn_phys->dn_nlevels-1 && |
4491 | db->db_blkid != DMU_SPILL_BLKID) || | |
4492 | (db->db_blkid == DMU_SPILL_BLKID && db->db_level == 0)); | |
4493 | if (db->db_blkid != DMU_SPILL_BLKID) | |
4494 | ASSERT3P(db->db_blkptr, ==, | |
4495 | &dn->dn_phys->dn_blkptr[db->db_blkid]); | |
4496 | zio = dn->dn_zio; | |
4497 | } | |
4498 | ||
4499 | ASSERT(db->db_level == 0 || data == db->db_buf); | |
4500 | ASSERT3U(db->db_blkptr->blk_birth, <=, txg); | |
4501 | ASSERT(zio); | |
4502 | ||
4503 | SET_BOOKMARK(&zb, os->os_dsl_dataset ? | |
4504 | os->os_dsl_dataset->ds_object : DMU_META_OBJSET, | |
4505 | db->db.db_object, db->db_level, db->db_blkid); | |
4506 | ||
4507 | if (db->db_blkid == DMU_SPILL_BLKID) | |
4508 | wp_flag = WP_SPILL; | |
4509 | wp_flag |= (db->db_state == DB_NOFILL) ? WP_NOFILL : 0; | |
4510 | ||
82644107 | 4511 | dmu_write_policy(os, dn, db->db_level, wp_flag, &zp); |
572e2857 | 4512 | DB_DNODE_EXIT(db); |
428870ff | 4513 | |
463a8cfe AR |
4514 | /* |
4515 | * We copy the blkptr now (rather than when we instantiate the dirty | |
4516 | * record), because its value can change between open context and | |
4517 | * syncing context. We do not need to hold dn_struct_rwlock to read | |
4518 | * db_blkptr because we are in syncing context. | |
4519 | */ | |
4520 | dr->dr_bp_copy = *db->db_blkptr; | |
4521 | ||
9b67f605 MA |
4522 | if (db->db_level == 0 && |
4523 | dr->dt.dl.dr_override_state == DR_OVERRIDDEN) { | |
4524 | /* | |
4525 | * The BP for this block has been provided by open context | |
4526 | * (by dmu_sync() or dmu_buf_write_embedded()). | |
4527 | */ | |
a6255b7f DQ |
4528 | abd_t *contents = (data != NULL) ? |
4529 | abd_get_from_buf(data->b_data, arc_buf_size(data)) : NULL; | |
9b67f605 | 4530 | |
428870ff | 4531 | dr->dr_zio = zio_write(zio, os->os_spa, txg, |
2aa34383 DK |
4532 | &dr->dr_bp_copy, contents, db->db.db_size, db->db.db_size, |
4533 | &zp, dbuf_write_override_ready, NULL, NULL, | |
bc77ba73 | 4534 | dbuf_write_override_done, |
e8b96c60 | 4535 | dr, ZIO_PRIORITY_ASYNC_WRITE, ZIO_FLAG_MUSTSUCCEED, &zb); |
428870ff BB |
4536 | mutex_enter(&db->db_mtx); |
4537 | dr->dt.dl.dr_override_state = DR_NOT_OVERRIDDEN; | |
4538 | zio_write_override(dr->dr_zio, &dr->dt.dl.dr_overridden_by, | |
03c6040b | 4539 | dr->dt.dl.dr_copies, dr->dt.dl.dr_nopwrite); |
428870ff BB |
4540 | mutex_exit(&db->db_mtx); |
4541 | } else if (db->db_state == DB_NOFILL) { | |
3c67d83a TH |
4542 | ASSERT(zp.zp_checksum == ZIO_CHECKSUM_OFF || |
4543 | zp.zp_checksum == ZIO_CHECKSUM_NOPARITY); | |
428870ff | 4544 | dr->dr_zio = zio_write(zio, os->os_spa, txg, |
2aa34383 | 4545 | &dr->dr_bp_copy, NULL, db->db.db_size, db->db.db_size, &zp, |
bc77ba73 PD |
4546 | dbuf_write_nofill_ready, NULL, NULL, |
4547 | dbuf_write_nofill_done, db, | |
428870ff BB |
4548 | ZIO_PRIORITY_ASYNC_WRITE, |
4549 | ZIO_FLAG_MUSTSUCCEED | ZIO_FLAG_NODATA, &zb); | |
4550 | } else { | |
4551 | ASSERT(arc_released(data)); | |
bc77ba73 PD |
4552 | |
4553 | /* | |
4554 | * For indirect blocks, we want to setup the children | |
4555 | * ready callback so that we can properly handle an indirect | |
4556 | * block that only contains holes. | |
4557 | */ | |
1c27024e | 4558 | arc_write_done_func_t *children_ready_cb = NULL; |
bc77ba73 PD |
4559 | if (db->db_level != 0) |
4560 | children_ready_cb = dbuf_write_children_ready; | |
4561 | ||
428870ff | 4562 | dr->dr_zio = arc_write(zio, os->os_spa, txg, |
463a8cfe | 4563 | &dr->dr_bp_copy, data, DBUF_IS_L2CACHEABLE(db), |
d3c2ae1c GW |
4564 | &zp, dbuf_write_ready, |
4565 | children_ready_cb, dbuf_write_physdone, | |
4566 | dbuf_write_done, db, ZIO_PRIORITY_ASYNC_WRITE, | |
4567 | ZIO_FLAG_MUSTSUCCEED, &zb); | |
428870ff | 4568 | } |
34dc7c2f | 4569 | } |
c28b2279 | 4570 | |
93ce2b4c | 4571 | #if defined(_KERNEL) |
8f576c23 BB |
4572 | EXPORT_SYMBOL(dbuf_find); |
4573 | EXPORT_SYMBOL(dbuf_is_metadata); | |
d3c2ae1c | 4574 | EXPORT_SYMBOL(dbuf_destroy); |
8f576c23 BB |
4575 | EXPORT_SYMBOL(dbuf_loan_arcbuf); |
4576 | EXPORT_SYMBOL(dbuf_whichblock); | |
4577 | EXPORT_SYMBOL(dbuf_read); | |
4578 | EXPORT_SYMBOL(dbuf_unoverride); | |
4579 | EXPORT_SYMBOL(dbuf_free_range); | |
4580 | EXPORT_SYMBOL(dbuf_new_size); | |
4581 | EXPORT_SYMBOL(dbuf_release_bp); | |
4582 | EXPORT_SYMBOL(dbuf_dirty); | |
0c03d21a | 4583 | EXPORT_SYMBOL(dmu_buf_set_crypt_params); |
c28b2279 | 4584 | EXPORT_SYMBOL(dmu_buf_will_dirty); |
a73e8fdb | 4585 | EXPORT_SYMBOL(dmu_buf_is_dirty); |
8f576c23 BB |
4586 | EXPORT_SYMBOL(dmu_buf_will_not_fill); |
4587 | EXPORT_SYMBOL(dmu_buf_will_fill); | |
4588 | EXPORT_SYMBOL(dmu_buf_fill_done); | |
4047414a | 4589 | EXPORT_SYMBOL(dmu_buf_rele); |
8f576c23 | 4590 | EXPORT_SYMBOL(dbuf_assign_arcbuf); |
8f576c23 BB |
4591 | EXPORT_SYMBOL(dbuf_prefetch); |
4592 | EXPORT_SYMBOL(dbuf_hold_impl); | |
4593 | EXPORT_SYMBOL(dbuf_hold); | |
4594 | EXPORT_SYMBOL(dbuf_hold_level); | |
4595 | EXPORT_SYMBOL(dbuf_create_bonus); | |
4596 | EXPORT_SYMBOL(dbuf_spill_set_blksz); | |
4597 | EXPORT_SYMBOL(dbuf_rm_spill); | |
4598 | EXPORT_SYMBOL(dbuf_add_ref); | |
4599 | EXPORT_SYMBOL(dbuf_rele); | |
4600 | EXPORT_SYMBOL(dbuf_rele_and_unlock); | |
4601 | EXPORT_SYMBOL(dbuf_refcount); | |
4602 | EXPORT_SYMBOL(dbuf_sync_list); | |
4603 | EXPORT_SYMBOL(dmu_buf_set_user); | |
4604 | EXPORT_SYMBOL(dmu_buf_set_user_ie); | |
8f576c23 | 4605 | EXPORT_SYMBOL(dmu_buf_get_user); |
0f699108 | 4606 | EXPORT_SYMBOL(dmu_buf_get_blkptr); |
d3c2ae1c | 4607 | |
02730c33 | 4608 | /* BEGIN CSTYLED */ |
d3c2ae1c GW |
4609 | module_param(dbuf_cache_max_bytes, ulong, 0644); |
4610 | MODULE_PARM_DESC(dbuf_cache_max_bytes, | |
02730c33 | 4611 | "Maximum size in bytes of the dbuf cache."); |
d3c2ae1c GW |
4612 | |
4613 | module_param(dbuf_cache_hiwater_pct, uint, 0644); | |
4614 | MODULE_PARM_DESC(dbuf_cache_hiwater_pct, | |
f974e25d | 4615 | "Percentage over dbuf_cache_max_bytes when dbufs must be evicted " |
4616 | "directly."); | |
d3c2ae1c GW |
4617 | |
4618 | module_param(dbuf_cache_lowater_pct, uint, 0644); | |
4619 | MODULE_PARM_DESC(dbuf_cache_lowater_pct, | |
f974e25d | 4620 | "Percentage below dbuf_cache_max_bytes when the evict thread stops " |
4621 | "evicting dbufs."); | |
d3c2ae1c | 4622 | |
2e5dc449 MA |
4623 | module_param(dbuf_metadata_cache_max_bytes, ulong, 0644); |
4624 | MODULE_PARM_DESC(dbuf_metadata_cache_max_bytes, | |
4625 | "Maximum size in bytes of the dbuf metadata cache."); | |
4626 | ||
de4f8d5d BB |
4627 | module_param(dbuf_cache_shift, int, 0644); |
4628 | MODULE_PARM_DESC(dbuf_cache_shift, | |
4629 | "Set the size of the dbuf cache to a log2 fraction of arc size."); | |
2e5dc449 MA |
4630 | |
4631 | module_param(dbuf_metadata_cache_shift, int, 0644); | |
4632 | MODULE_PARM_DESC(dbuf_cache_shift, | |
4633 | "Set the size of the dbuf metadata cache to a log2 fraction of " | |
4634 | "arc size."); | |
02730c33 | 4635 | /* END CSTYLED */ |
c28b2279 | 4636 | #endif |