1fa9e4066Sahrens /* 2fa9e4066Sahrens * CDDL HEADER START 3fa9e4066Sahrens * 4fa9e4066Sahrens * The contents of this file are subject to the terms of the 5f65e61c0Sahrens * Common Development and Distribution License (the "License"). 6f65e61c0Sahrens * You may not use this file except in compliance with the License. 7fa9e4066Sahrens * 8fa9e4066Sahrens * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9fa9e4066Sahrens * or http://www.opensolaris.org/os/licensing. 10fa9e4066Sahrens * See the License for the specific language governing permissions 11fa9e4066Sahrens * and limitations under the License. 12fa9e4066Sahrens * 13fa9e4066Sahrens * When distributing Covered Code, include this CDDL HEADER in each 14fa9e4066Sahrens * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15fa9e4066Sahrens * If applicable, add the following below this CDDL HEADER, with the 16fa9e4066Sahrens * fields enclosed by brackets "[]" replaced with your own identifying 17fa9e4066Sahrens * information: Portions Copyright [yyyy] [name of copyright owner] 18fa9e4066Sahrens * 19fa9e4066Sahrens * CDDL HEADER END 20fa9e4066Sahrens */ 21fa9e4066Sahrens /* 2206e0070dSMark Shellenbaum * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 233f2366c2SGordon Ross * Copyright 2011 Nexenta Systems, Inc. All rights reserved. 24fa98e487SMatthew Ahrens * Copyright (c) 2012, 2018 by Delphix. All rights reserved. 25aad02571SSaso Kiselkov * Copyright (c) 2013 by Saso Kiselkov. All rights reserved. 26810e43b2SBill Pijewski * Copyright (c) 2013, Joyent, Inc. All rights reserved. 27bc9014e6SJustin Gibbs * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved. 28c3d26abcSMatthew Ahrens * Copyright (c) 2014 Integros [integros.com] 29fa9e4066Sahrens */ 30fa9e4066Sahrens 31fa9e4066Sahrens #include <sys/zfs_context.h> 32fa9e4066Sahrens #include <sys/dmu.h> 332f3d8780SMatthew Ahrens #include <sys/dmu_send.h> 34fa9e4066Sahrens #include <sys/dmu_impl.h> 35fa9e4066Sahrens #include <sys/dbuf.h> 36fa9e4066Sahrens #include <sys/dmu_objset.h> 37fa9e4066Sahrens #include <sys/dsl_dataset.h> 38fa9e4066Sahrens #include <sys/dsl_dir.h> 39fa9e4066Sahrens #include <sys/dmu_tx.h> 40fa9e4066Sahrens #include <sys/spa.h> 41fa9e4066Sahrens #include <sys/zio.h> 42fa9e4066Sahrens #include <sys/dmu_zfetch.h> 430a586ceaSMark Shellenbaum #include <sys/sa.h> 440a586ceaSMark Shellenbaum #include <sys/sa_impl.h> 455d7b4d43SMatthew Ahrens #include <sys/zfeature.h> 465d7b4d43SMatthew Ahrens #include <sys/blkptr.h> 47bf16b11eSMatthew Ahrens #include <sys/range_tree.h> 48dcbf3bd6SGeorge Wilson #include <sys/callb.h> 49770499e1SDan Kimmel #include <sys/abd.h> 505cabbc6bSPrashanth Sreenivasa #include <sys/vdev.h> 513a2d8a1bSPaul Dagnelie #include <sys/cityhash.h> 52adb52d92SMatthew Ahrens #include <sys/spa_impl.h> 53dcbf3bd6SGeorge Wilson 543b2aab18SMatthew Ahrens static boolean_t dbuf_undirty(dmu_buf_impl_t *db, dmu_tx_t *tx); 55088f3894Sahrens static void dbuf_write(dbuf_dirty_record_t *dr, arc_buf_t *data, dmu_tx_t *tx); 56fa9e4066Sahrens 57bc9014e6SJustin Gibbs #ifndef __lint 58bc9014e6SJustin Gibbs extern inline void dmu_buf_init_user(dmu_buf_user_t *dbu, 5940510e8eSJosef 'Jeff' Sipek dmu_buf_evict_func_t *evict_func_sync, 6040510e8eSJosef 'Jeff' Sipek dmu_buf_evict_func_t *evict_func_async, 6140510e8eSJosef 'Jeff' Sipek dmu_buf_t **clear_on_evict_dbufp); 62bc9014e6SJustin Gibbs #endif /* ! __lint */ 63bc9014e6SJustin Gibbs 64fa9e4066Sahrens /* 65fa9e4066Sahrens * Global data structures and functions for the dbuf cache. 66fa9e4066Sahrens */ 67dcbf3bd6SGeorge Wilson static kmem_cache_t *dbuf_kmem_cache; 68bc9014e6SJustin Gibbs static taskq_t *dbu_evict_taskq; 69fa9e4066Sahrens 70dcbf3bd6SGeorge Wilson static kthread_t *dbuf_cache_evict_thread; 71dcbf3bd6SGeorge Wilson static kmutex_t dbuf_evict_lock; 72dcbf3bd6SGeorge Wilson static kcondvar_t dbuf_evict_cv; 73dcbf3bd6SGeorge Wilson static boolean_t dbuf_evict_thread_exit; 74dcbf3bd6SGeorge Wilson 75dcbf3bd6SGeorge Wilson /* 76adb52d92SMatthew Ahrens * There are two dbuf caches; each dbuf can only be in one of them at a time. 77adb52d92SMatthew Ahrens * 78adb52d92SMatthew Ahrens * 1. Cache of metadata dbufs, to help make read-heavy administrative commands 79adb52d92SMatthew Ahrens * from /sbin/zfs run faster. The "metadata cache" specifically stores dbufs 80adb52d92SMatthew Ahrens * that represent the metadata that describes filesystems/snapshots/ 81adb52d92SMatthew Ahrens * bookmarks/properties/etc. We only evict from this cache when we export a 82adb52d92SMatthew Ahrens * pool, to short-circuit as much I/O as possible for all administrative 83adb52d92SMatthew Ahrens * commands that need the metadata. There is no eviction policy for this 84adb52d92SMatthew Ahrens * cache, because we try to only include types in it which would occupy a 85adb52d92SMatthew Ahrens * very small amount of space per object but create a large impact on the 86adb52d92SMatthew Ahrens * performance of these commands. Instead, after it reaches a maximum size 87adb52d92SMatthew Ahrens * (which should only happen on very small memory systems with a very large 88adb52d92SMatthew Ahrens * number of filesystem objects), we stop taking new dbufs into the 89adb52d92SMatthew Ahrens * metadata cache, instead putting them in the normal dbuf cache. 90adb52d92SMatthew Ahrens * 91adb52d92SMatthew Ahrens * 2. LRU cache of dbufs. The "dbuf cache" maintains a list of dbufs that 92dcbf3bd6SGeorge Wilson * are not currently held but have been recently released. These dbufs 93dcbf3bd6SGeorge Wilson * are not eligible for arc eviction until they are aged out of the cache. 94dcbf3bd6SGeorge Wilson * Dbufs that are aged out of the cache will be immediately destroyed and 95dcbf3bd6SGeorge Wilson * become eligible for arc eviction. 96adb52d92SMatthew Ahrens * 97adb52d92SMatthew Ahrens * Dbufs are added to these caches once the last hold is released. If a dbuf is 98adb52d92SMatthew Ahrens * later accessed and still exists in the dbuf cache, then it will be removed 99adb52d92SMatthew Ahrens * from the cache and later re-added to the head of the cache. 100adb52d92SMatthew Ahrens * 101adb52d92SMatthew Ahrens * If a given dbuf meets the requirements for the metadata cache, it will go 102adb52d92SMatthew Ahrens * there, otherwise it will be considered for the generic LRU dbuf cache. The 103adb52d92SMatthew Ahrens * caches and the refcounts tracking their sizes are stored in an array indexed 104adb52d92SMatthew Ahrens * by those caches' matching enum values (from dbuf_cached_state_t). 105dcbf3bd6SGeorge Wilson */ 106adb52d92SMatthew Ahrens typedef struct dbuf_cache { 107adb52d92SMatthew Ahrens multilist_t *cache; 108e914ace2STim Schumacher zfs_refcount_t size; 109adb52d92SMatthew Ahrens } dbuf_cache_t; 110adb52d92SMatthew Ahrens dbuf_cache_t dbuf_caches[DB_CACHE_MAX]; 111dcbf3bd6SGeorge Wilson 112adb52d92SMatthew Ahrens /* Size limits for the caches */ 113adb52d92SMatthew Ahrens uint64_t dbuf_cache_max_bytes = 0; 114adb52d92SMatthew Ahrens uint64_t dbuf_metadata_cache_max_bytes = 0; 115adb52d92SMatthew Ahrens /* Set the default sizes of the caches to log2 fraction of arc size */ 116268bbb2aSGeorge Wilson int dbuf_cache_shift = 5; 117adb52d92SMatthew Ahrens int dbuf_metadata_cache_shift = 6; 118dcbf3bd6SGeorge Wilson 119dcbf3bd6SGeorge Wilson /* 120adb52d92SMatthew Ahrens * For diagnostic purposes, this is incremented whenever we can't add 121adb52d92SMatthew Ahrens * something to the metadata cache because it's full, and instead put 122adb52d92SMatthew Ahrens * the data in the regular dbuf cache. 123adb52d92SMatthew Ahrens */ 124adb52d92SMatthew Ahrens uint64_t dbuf_metadata_cache_overflow; 125adb52d92SMatthew Ahrens 126adb52d92SMatthew Ahrens /* 127adb52d92SMatthew Ahrens * The LRU dbuf cache uses a three-stage eviction policy: 128dcbf3bd6SGeorge Wilson * - A low water marker designates when the dbuf eviction thread 129dcbf3bd6SGeorge Wilson * should stop evicting from the dbuf cache. 130dcbf3bd6SGeorge Wilson * - When we reach the maximum size (aka mid water mark), we 131dcbf3bd6SGeorge Wilson * signal the eviction thread to run. 132dcbf3bd6SGeorge Wilson * - The high water mark indicates when the eviction thread 133dcbf3bd6SGeorge Wilson * is unable to keep up with the incoming load and eviction must 134dcbf3bd6SGeorge Wilson * happen in the context of the calling thread. 135dcbf3bd6SGeorge Wilson * 136dcbf3bd6SGeorge Wilson * The dbuf cache: 137dcbf3bd6SGeorge Wilson * (max size) 138dcbf3bd6SGeorge Wilson * low water mid water hi water 139dcbf3bd6SGeorge Wilson * +----------------------------------------+----------+----------+ 140dcbf3bd6SGeorge Wilson * | | | | 141dcbf3bd6SGeorge Wilson * | | | | 142dcbf3bd6SGeorge Wilson * | | | | 143dcbf3bd6SGeorge Wilson * | | | | 144dcbf3bd6SGeorge Wilson * +----------------------------------------+----------+----------+ 145dcbf3bd6SGeorge Wilson * stop signal evict 146dcbf3bd6SGeorge Wilson * evicting eviction directly 147dcbf3bd6SGeorge Wilson * thread 148dcbf3bd6SGeorge Wilson * 149dcbf3bd6SGeorge Wilson * The high and low water marks indicate the operating range for the eviction 150dcbf3bd6SGeorge Wilson * thread. The low water mark is, by default, 90% of the total size of the 151dcbf3bd6SGeorge Wilson * cache and the high water mark is at 110% (both of these percentages can be 152dcbf3bd6SGeorge Wilson * changed by setting dbuf_cache_lowater_pct and dbuf_cache_hiwater_pct, 153dcbf3bd6SGeorge Wilson * respectively). The eviction thread will try to ensure that the cache remains 154dcbf3bd6SGeorge Wilson * within this range by waking up every second and checking if the cache is 155dcbf3bd6SGeorge Wilson * above the low water mark. The thread can also be woken up by callers adding 156dcbf3bd6SGeorge Wilson * elements into the cache if the cache is larger than the mid water (i.e max 157dcbf3bd6SGeorge Wilson * cache size). Once the eviction thread is woken up and eviction is required, 158dcbf3bd6SGeorge Wilson * it will continue evicting buffers until it's able to reduce the cache size 159dcbf3bd6SGeorge Wilson * to the low water mark. If the cache size continues to grow and hits the high 160dcbf3bd6SGeorge Wilson * water mark, then callers adding elments to the cache will begin to evict 161dcbf3bd6SGeorge Wilson * directly from the cache until the cache is no longer above the high water 162dcbf3bd6SGeorge Wilson * mark. 163dcbf3bd6SGeorge Wilson */ 164dcbf3bd6SGeorge Wilson 165dcbf3bd6SGeorge Wilson /* 166dcbf3bd6SGeorge Wilson * The percentage above and below the maximum cache size. 167dcbf3bd6SGeorge Wilson */ 168dcbf3bd6SGeorge Wilson uint_t dbuf_cache_hiwater_pct = 10; 169dcbf3bd6SGeorge Wilson uint_t dbuf_cache_lowater_pct = 10; 170dcbf3bd6SGeorge Wilson 171fa9e4066Sahrens /* ARGSUSED */ 172fa9e4066Sahrens static int 173fa9e4066Sahrens dbuf_cons(void *vdb, void *unused, int kmflag) 174fa9e4066Sahrens { 175fa9e4066Sahrens dmu_buf_impl_t *db = vdb; 176fa9e4066Sahrens bzero(db, sizeof (dmu_buf_impl_t)); 177fa9e4066Sahrens 178fa9e4066Sahrens mutex_init(&db->db_mtx, NULL, MUTEX_DEFAULT, NULL); 179fa9e4066Sahrens cv_init(&db->db_changed, NULL, CV_DEFAULT, NULL); 180dcbf3bd6SGeorge Wilson multilist_link_init(&db->db_cache_link); 181e914ace2STim Schumacher zfs_refcount_create(&db->db_holds); 1820f6d88adSAlex Reece 183fa9e4066Sahrens return (0); 184fa9e4066Sahrens } 185fa9e4066Sahrens 186fa9e4066Sahrens /* ARGSUSED */ 187fa9e4066Sahrens static void 188fa9e4066Sahrens dbuf_dest(void *vdb, void *unused) 189fa9e4066Sahrens { 190fa9e4066Sahrens dmu_buf_impl_t *db = vdb; 191fa9e4066Sahrens mutex_destroy(&db->db_mtx); 192fa9e4066Sahrens cv_destroy(&db->db_changed); 193dcbf3bd6SGeorge Wilson ASSERT(!multilist_link_active(&db->db_cache_link)); 194e914ace2STim Schumacher zfs_refcount_destroy(&db->db_holds); 195fa9e4066Sahrens } 196fa9e4066Sahrens 197fa9e4066Sahrens /* 198fa9e4066Sahrens * dbuf hash table routines 199fa9e4066Sahrens */ 200fa9e4066Sahrens static dbuf_hash_table_t dbuf_hash_table; 201fa9e4066Sahrens 202fa9e4066Sahrens static uint64_t dbuf_hash_count; 203fa9e4066Sahrens 2043a2d8a1bSPaul Dagnelie /* 2053a2d8a1bSPaul Dagnelie * We use Cityhash for this. It's fast, and has good hash properties without 2063a2d8a1bSPaul Dagnelie * requiring any large static buffers. 2073a2d8a1bSPaul Dagnelie */ 208fa9e4066Sahrens static uint64_t 209fa9e4066Sahrens dbuf_hash(void *os, uint64_t obj, uint8_t lvl, uint64_t blkid) 210fa9e4066Sahrens { 2113a2d8a1bSPaul Dagnelie return (cityhash4((uintptr_t)os, obj, (uint64_t)lvl, blkid)); 212fa9e4066Sahrens } 213fa9e4066Sahrens 214fa9e4066Sahrens #define DBUF_EQUAL(dbuf, os, obj, level, blkid) \ 215fa9e4066Sahrens ((dbuf)->db.db_object == (obj) && \ 216fa9e4066Sahrens (dbuf)->db_objset == (os) && \ 217fa9e4066Sahrens (dbuf)->db_level == (level) && \ 218fa9e4066Sahrens (dbuf)->db_blkid == (blkid)) 219fa9e4066Sahrens 220fa9e4066Sahrens dmu_buf_impl_t * 221e57a022bSJustin T. Gibbs dbuf_find(objset_t *os, uint64_t obj, uint8_t level, uint64_t blkid) 222fa9e4066Sahrens { 223fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 224dcbf3bd6SGeorge Wilson uint64_t hv = dbuf_hash(os, obj, level, blkid); 225fa9e4066Sahrens uint64_t idx = hv & h->hash_table_mask; 226fa9e4066Sahrens dmu_buf_impl_t *db; 227fa9e4066Sahrens 228fa9e4066Sahrens mutex_enter(DBUF_HASH_MUTEX(h, idx)); 229fa9e4066Sahrens for (db = h->hash_table[idx]; db != NULL; db = db->db_hash_next) { 230fa9e4066Sahrens if (DBUF_EQUAL(db, os, obj, level, blkid)) { 231fa9e4066Sahrens mutex_enter(&db->db_mtx); 232ea8dc4b6Seschrock if (db->db_state != DB_EVICTING) { 233fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 234fa9e4066Sahrens return (db); 235fa9e4066Sahrens } 236fa9e4066Sahrens mutex_exit(&db->db_mtx); 237fa9e4066Sahrens } 238fa9e4066Sahrens } 239fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 240fa9e4066Sahrens return (NULL); 241fa9e4066Sahrens } 242fa9e4066Sahrens 243e57a022bSJustin T. Gibbs static dmu_buf_impl_t * 244e57a022bSJustin T. Gibbs dbuf_find_bonus(objset_t *os, uint64_t object) 245e57a022bSJustin T. Gibbs { 246e57a022bSJustin T. Gibbs dnode_t *dn; 247e57a022bSJustin T. Gibbs dmu_buf_impl_t *db = NULL; 248e57a022bSJustin T. Gibbs 249e57a022bSJustin T. Gibbs if (dnode_hold(os, object, FTAG, &dn) == 0) { 250e57a022bSJustin T. Gibbs rw_enter(&dn->dn_struct_rwlock, RW_READER); 251e57a022bSJustin T. Gibbs if (dn->dn_bonus != NULL) { 252e57a022bSJustin T. Gibbs db = dn->dn_bonus; 253e57a022bSJustin T. Gibbs mutex_enter(&db->db_mtx); 254e57a022bSJustin T. Gibbs } 255e57a022bSJustin T. Gibbs rw_exit(&dn->dn_struct_rwlock); 256e57a022bSJustin T. Gibbs dnode_rele(dn, FTAG); 257e57a022bSJustin T. Gibbs } 258e57a022bSJustin T. Gibbs return (db); 259e57a022bSJustin T. Gibbs } 260e57a022bSJustin T. Gibbs 261fa9e4066Sahrens /* 262fa9e4066Sahrens * Insert an entry into the hash table. If there is already an element 263fa9e4066Sahrens * equal to elem in the hash table, then the already existing element 264fa9e4066Sahrens * will be returned and the new element will not be inserted. 265fa9e4066Sahrens * Otherwise returns NULL. 266fa9e4066Sahrens */ 267fa9e4066Sahrens static dmu_buf_impl_t * 268fa9e4066Sahrens dbuf_hash_insert(dmu_buf_impl_t *db) 269fa9e4066Sahrens { 270fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 271503ad85cSMatthew Ahrens objset_t *os = db->db_objset; 272fa9e4066Sahrens uint64_t obj = db->db.db_object; 273fa9e4066Sahrens int level = db->db_level; 274fa9e4066Sahrens uint64_t blkid = db->db_blkid; 275dcbf3bd6SGeorge Wilson uint64_t hv = dbuf_hash(os, obj, level, blkid); 276fa9e4066Sahrens uint64_t idx = hv & h->hash_table_mask; 277fa9e4066Sahrens dmu_buf_impl_t *dbf; 278fa9e4066Sahrens 279fa9e4066Sahrens mutex_enter(DBUF_HASH_MUTEX(h, idx)); 280fa9e4066Sahrens for (dbf = h->hash_table[idx]; dbf != NULL; dbf = dbf->db_hash_next) { 281fa9e4066Sahrens if (DBUF_EQUAL(dbf, os, obj, level, blkid)) { 282fa9e4066Sahrens mutex_enter(&dbf->db_mtx); 283ea8dc4b6Seschrock if (dbf->db_state != DB_EVICTING) { 284fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 285fa9e4066Sahrens return (dbf); 286fa9e4066Sahrens } 287fa9e4066Sahrens mutex_exit(&dbf->db_mtx); 288fa9e4066Sahrens } 289fa9e4066Sahrens } 290fa9e4066Sahrens 291fa9e4066Sahrens mutex_enter(&db->db_mtx); 292fa9e4066Sahrens db->db_hash_next = h->hash_table[idx]; 293fa9e4066Sahrens h->hash_table[idx] = db; 294fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 2951a5e258fSJosef 'Jeff' Sipek atomic_inc_64(&dbuf_hash_count); 296fa9e4066Sahrens 297fa9e4066Sahrens return (NULL); 298fa9e4066Sahrens } 299fa9e4066Sahrens 300fa9e4066Sahrens /* 301bbfa8ea8SMatthew Ahrens * Remove an entry from the hash table. It must be in the EVICTING state. 302fa9e4066Sahrens */ 303fa9e4066Sahrens static void 304fa9e4066Sahrens dbuf_hash_remove(dmu_buf_impl_t *db) 305fa9e4066Sahrens { 306fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 307dcbf3bd6SGeorge Wilson uint64_t hv = dbuf_hash(db->db_objset, db->db.db_object, 308fa9e4066Sahrens db->db_level, db->db_blkid); 309fa9e4066Sahrens uint64_t idx = hv & h->hash_table_mask; 310fa9e4066Sahrens dmu_buf_impl_t *dbf, **dbp; 311fa9e4066Sahrens 312fa9e4066Sahrens /* 313bbfa8ea8SMatthew Ahrens * We musn't hold db_mtx to maintain lock ordering: 314fa9e4066Sahrens * DBUF_HASH_MUTEX > db_mtx. 315fa9e4066Sahrens */ 316e914ace2STim Schumacher ASSERT(zfs_refcount_is_zero(&db->db_holds)); 317ea8dc4b6Seschrock ASSERT(db->db_state == DB_EVICTING); 318fa9e4066Sahrens ASSERT(!MUTEX_HELD(&db->db_mtx)); 319fa9e4066Sahrens 320fa9e4066Sahrens mutex_enter(DBUF_HASH_MUTEX(h, idx)); 321fa9e4066Sahrens dbp = &h->hash_table[idx]; 322fa9e4066Sahrens while ((dbf = *dbp) != db) { 323fa9e4066Sahrens dbp = &dbf->db_hash_next; 324fa9e4066Sahrens ASSERT(dbf != NULL); 325fa9e4066Sahrens } 326fa9e4066Sahrens *dbp = db->db_hash_next; 327fa9e4066Sahrens db->db_hash_next = NULL; 328fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 3291a5e258fSJosef 'Jeff' Sipek atomic_dec_64(&dbuf_hash_count); 330fa9e4066Sahrens } 331fa9e4066Sahrens 332bc9014e6SJustin Gibbs typedef enum { 333bc9014e6SJustin Gibbs DBVU_EVICTING, 334bc9014e6SJustin Gibbs DBVU_NOT_EVICTING 335bc9014e6SJustin Gibbs } dbvu_verify_type_t; 336bc9014e6SJustin Gibbs 337bc9014e6SJustin Gibbs static void 338bc9014e6SJustin Gibbs dbuf_verify_user(dmu_buf_impl_t *db, dbvu_verify_type_t verify_type) 339bc9014e6SJustin Gibbs { 340bc9014e6SJustin Gibbs #ifdef ZFS_DEBUG 341bc9014e6SJustin Gibbs int64_t holds; 342bc9014e6SJustin Gibbs 343bc9014e6SJustin Gibbs if (db->db_user == NULL) 344bc9014e6SJustin Gibbs return; 345bc9014e6SJustin Gibbs 346bc9014e6SJustin Gibbs /* Only data blocks support the attachment of user data. */ 347bc9014e6SJustin Gibbs ASSERT(db->db_level == 0); 348bc9014e6SJustin Gibbs 349bc9014e6SJustin Gibbs /* Clients must resolve a dbuf before attaching user data. */ 350bc9014e6SJustin Gibbs ASSERT(db->db.db_data != NULL); 351bc9014e6SJustin Gibbs ASSERT3U(db->db_state, ==, DB_CACHED); 352bc9014e6SJustin Gibbs 353e914ace2STim Schumacher holds = zfs_refcount_count(&db->db_holds); 354bc9014e6SJustin Gibbs if (verify_type == DBVU_EVICTING) { 355bc9014e6SJustin Gibbs /* 356bc9014e6SJustin Gibbs * Immediate eviction occurs when holds == dirtycnt. 357bc9014e6SJustin Gibbs * For normal eviction buffers, holds is zero on 358bc9014e6SJustin Gibbs * eviction, except when dbuf_fix_old_data() calls 359bc9014e6SJustin Gibbs * dbuf_clear_data(). However, the hold count can grow 360bc9014e6SJustin Gibbs * during eviction even though db_mtx is held (see 361bc9014e6SJustin Gibbs * dmu_bonus_hold() for an example), so we can only 362bc9014e6SJustin Gibbs * test the generic invariant that holds >= dirtycnt. 363bc9014e6SJustin Gibbs */ 364bc9014e6SJustin Gibbs ASSERT3U(holds, >=, db->db_dirtycnt); 365bc9014e6SJustin Gibbs } else { 366d2058105SJustin T. Gibbs if (db->db_user_immediate_evict == TRUE) 367bc9014e6SJustin Gibbs ASSERT3U(holds, >=, db->db_dirtycnt); 368bc9014e6SJustin Gibbs else 369bc9014e6SJustin Gibbs ASSERT3U(holds, >, 0); 370bc9014e6SJustin Gibbs } 371bc9014e6SJustin Gibbs #endif 372bc9014e6SJustin Gibbs } 373bc9014e6SJustin Gibbs 374fa9e4066Sahrens static void 375fa9e4066Sahrens dbuf_evict_user(dmu_buf_impl_t *db) 376fa9e4066Sahrens { 377bc9014e6SJustin Gibbs dmu_buf_user_t *dbu = db->db_user; 378bc9014e6SJustin Gibbs 379fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 380fa9e4066Sahrens 381bc9014e6SJustin Gibbs if (dbu == NULL) 382fa9e4066Sahrens return; 383fa9e4066Sahrens 384bc9014e6SJustin Gibbs dbuf_verify_user(db, DBVU_EVICTING); 385bc9014e6SJustin Gibbs db->db_user = NULL; 386bc9014e6SJustin Gibbs 387bc9014e6SJustin Gibbs #ifdef ZFS_DEBUG 388bc9014e6SJustin Gibbs if (dbu->dbu_clear_on_evict_dbufp != NULL) 389bc9014e6SJustin Gibbs *dbu->dbu_clear_on_evict_dbufp = NULL; 390bc9014e6SJustin Gibbs #endif 391bc9014e6SJustin Gibbs 392bc9014e6SJustin Gibbs /* 39340510e8eSJosef 'Jeff' Sipek * There are two eviction callbacks - one that we call synchronously 39440510e8eSJosef 'Jeff' Sipek * and one that we invoke via a taskq. The async one is useful for 39540510e8eSJosef 'Jeff' Sipek * avoiding lock order reversals and limiting stack depth. 39640510e8eSJosef 'Jeff' Sipek * 39740510e8eSJosef 'Jeff' Sipek * Note that if we have a sync callback but no async callback, 39840510e8eSJosef 'Jeff' Sipek * it's likely that the sync callback will free the structure 39940510e8eSJosef 'Jeff' Sipek * containing the dbu. In that case we need to take care to not 40040510e8eSJosef 'Jeff' Sipek * dereference dbu after calling the sync evict func. 401bc9014e6SJustin Gibbs */ 40240510e8eSJosef 'Jeff' Sipek boolean_t has_async = (dbu->dbu_evict_func_async != NULL); 40340510e8eSJosef 'Jeff' Sipek 40440510e8eSJosef 'Jeff' Sipek if (dbu->dbu_evict_func_sync != NULL) 40540510e8eSJosef 'Jeff' Sipek dbu->dbu_evict_func_sync(dbu); 40640510e8eSJosef 'Jeff' Sipek 40740510e8eSJosef 'Jeff' Sipek if (has_async) { 40840510e8eSJosef 'Jeff' Sipek taskq_dispatch_ent(dbu_evict_taskq, dbu->dbu_evict_func_async, 40940510e8eSJosef 'Jeff' Sipek dbu, 0, &dbu->dbu_tqent); 41040510e8eSJosef 'Jeff' Sipek } 411fa9e4066Sahrens } 412fa9e4066Sahrens 413744947dcSTom Erickson boolean_t 414744947dcSTom Erickson dbuf_is_metadata(dmu_buf_impl_t *db) 415744947dcSTom Erickson { 416744947dcSTom Erickson if (db->db_level > 0) { 417744947dcSTom Erickson return (B_TRUE); 418744947dcSTom Erickson } else { 419744947dcSTom Erickson boolean_t is_metadata; 420744947dcSTom Erickson 421744947dcSTom Erickson DB_DNODE_ENTER(db); 422ad135b5dSChristopher Siden is_metadata = DMU_OT_IS_METADATA(DB_DNODE(db)->dn_type); 423744947dcSTom Erickson DB_DNODE_EXIT(db); 424744947dcSTom Erickson 425744947dcSTom Erickson return (is_metadata); 426744947dcSTom Erickson } 427744947dcSTom Erickson } 428744947dcSTom Erickson 429dcbf3bd6SGeorge Wilson /* 430adb52d92SMatthew Ahrens * This returns whether this dbuf should be stored in the metadata cache, which 431adb52d92SMatthew Ahrens * is based on whether it's from one of the dnode types that store data related 432adb52d92SMatthew Ahrens * to traversing dataset hierarchies. 433adb52d92SMatthew Ahrens */ 434adb52d92SMatthew Ahrens static boolean_t 435adb52d92SMatthew Ahrens dbuf_include_in_metadata_cache(dmu_buf_impl_t *db) 436adb52d92SMatthew Ahrens { 437adb52d92SMatthew Ahrens DB_DNODE_ENTER(db); 438adb52d92SMatthew Ahrens dmu_object_type_t type = DB_DNODE(db)->dn_type; 439adb52d92SMatthew Ahrens DB_DNODE_EXIT(db); 440adb52d92SMatthew Ahrens 441adb52d92SMatthew Ahrens /* Check if this dbuf is one of the types we care about */ 442adb52d92SMatthew Ahrens if (DMU_OT_IS_METADATA_CACHED(type)) { 443adb52d92SMatthew Ahrens /* If we hit this, then we set something up wrong in dmu_ot */ 444adb52d92SMatthew Ahrens ASSERT(DMU_OT_IS_METADATA(type)); 445adb52d92SMatthew Ahrens 446adb52d92SMatthew Ahrens /* 447adb52d92SMatthew Ahrens * Sanity check for small-memory systems: don't allocate too 448adb52d92SMatthew Ahrens * much memory for this purpose. 449adb52d92SMatthew Ahrens */ 450e914ace2STim Schumacher if (zfs_refcount_count( 451e914ace2STim Schumacher &dbuf_caches[DB_DBUF_METADATA_CACHE].size) > 452adb52d92SMatthew Ahrens dbuf_metadata_cache_max_bytes) { 453adb52d92SMatthew Ahrens dbuf_metadata_cache_overflow++; 454adb52d92SMatthew Ahrens DTRACE_PROBE1(dbuf__metadata__cache__overflow, 455adb52d92SMatthew Ahrens dmu_buf_impl_t *, db); 456adb52d92SMatthew Ahrens return (B_FALSE); 457adb52d92SMatthew Ahrens } 458adb52d92SMatthew Ahrens 459adb52d92SMatthew Ahrens return (B_TRUE); 460adb52d92SMatthew Ahrens } 461adb52d92SMatthew Ahrens 462adb52d92SMatthew Ahrens return (B_FALSE); 463adb52d92SMatthew Ahrens } 464adb52d92SMatthew Ahrens 465adb52d92SMatthew Ahrens /* 466dcbf3bd6SGeorge Wilson * This function *must* return indices evenly distributed between all 467dcbf3bd6SGeorge Wilson * sublists of the multilist. This is needed due to how the dbuf eviction 468dcbf3bd6SGeorge Wilson * code is laid out; dbuf_evict_thread() assumes dbufs are evenly 469dcbf3bd6SGeorge Wilson * distributed between all sublists and uses this assumption when 470dcbf3bd6SGeorge Wilson * deciding which sublist to evict from and how much to evict from it. 471dcbf3bd6SGeorge Wilson */ 472dcbf3bd6SGeorge Wilson unsigned int 473dcbf3bd6SGeorge Wilson dbuf_cache_multilist_index_func(multilist_t *ml, void *obj) 474ea8dc4b6Seschrock { 475dcbf3bd6SGeorge Wilson dmu_buf_impl_t *db = obj; 476ea8dc4b6Seschrock 477dcbf3bd6SGeorge Wilson /* 478dcbf3bd6SGeorge Wilson * The assumption here, is the hash value for a given 479dcbf3bd6SGeorge Wilson * dmu_buf_impl_t will remain constant throughout it's lifetime 480dcbf3bd6SGeorge Wilson * (i.e. it's objset, object, level and blkid fields don't change). 481dcbf3bd6SGeorge Wilson * Thus, we don't need to store the dbuf's sublist index 482dcbf3bd6SGeorge Wilson * on insertion, as this index can be recalculated on removal. 483dcbf3bd6SGeorge Wilson * 484dcbf3bd6SGeorge Wilson * Also, the low order bits of the hash value are thought to be 485dcbf3bd6SGeorge Wilson * distributed evenly. Otherwise, in the case that the multilist 486dcbf3bd6SGeorge Wilson * has a power of two number of sublists, each sublists' usage 487dcbf3bd6SGeorge Wilson * would not be evenly distributed. 488dcbf3bd6SGeorge Wilson */ 489dcbf3bd6SGeorge Wilson return (dbuf_hash(db->db_objset, db->db.db_object, 490dcbf3bd6SGeorge Wilson db->db_level, db->db_blkid) % 491dcbf3bd6SGeorge Wilson multilist_get_num_sublists(ml)); 492dcbf3bd6SGeorge Wilson } 493dcbf3bd6SGeorge Wilson 494dcbf3bd6SGeorge Wilson static inline boolean_t 495dcbf3bd6SGeorge Wilson dbuf_cache_above_hiwater(void) 496dcbf3bd6SGeorge Wilson { 497dcbf3bd6SGeorge Wilson uint64_t dbuf_cache_hiwater_bytes = 498dcbf3bd6SGeorge Wilson (dbuf_cache_max_bytes * dbuf_cache_hiwater_pct) / 100; 499dcbf3bd6SGeorge Wilson 500e914ace2STim Schumacher return (zfs_refcount_count(&dbuf_caches[DB_DBUF_CACHE].size) > 501dcbf3bd6SGeorge Wilson dbuf_cache_max_bytes + dbuf_cache_hiwater_bytes); 502dcbf3bd6SGeorge Wilson } 503dcbf3bd6SGeorge Wilson 504dcbf3bd6SGeorge Wilson static inline boolean_t 505dcbf3bd6SGeorge Wilson dbuf_cache_above_lowater(void) 506dcbf3bd6SGeorge Wilson { 507dcbf3bd6SGeorge Wilson uint64_t dbuf_cache_lowater_bytes = 508dcbf3bd6SGeorge Wilson (dbuf_cache_max_bytes * dbuf_cache_lowater_pct) / 100; 509dcbf3bd6SGeorge Wilson 510e914ace2STim Schumacher return (zfs_refcount_count(&dbuf_caches[DB_DBUF_CACHE].size) > 511dcbf3bd6SGeorge Wilson dbuf_cache_max_bytes - dbuf_cache_lowater_bytes); 512dcbf3bd6SGeorge Wilson } 513dcbf3bd6SGeorge Wilson 514dcbf3bd6SGeorge Wilson /* 515dcbf3bd6SGeorge Wilson * Evict the oldest eligible dbuf from the dbuf cache. 516dcbf3bd6SGeorge Wilson */ 517dcbf3bd6SGeorge Wilson static void 518dcbf3bd6SGeorge Wilson dbuf_evict_one(void) 519dcbf3bd6SGeorge Wilson { 520adb52d92SMatthew Ahrens int idx = multilist_get_random_index(dbuf_caches[DB_DBUF_CACHE].cache); 521adb52d92SMatthew Ahrens multilist_sublist_t *mls = multilist_sublist_lock( 522adb52d92SMatthew Ahrens dbuf_caches[DB_DBUF_CACHE].cache, idx); 523dcbf3bd6SGeorge Wilson 524dcbf3bd6SGeorge Wilson ASSERT(!MUTEX_HELD(&dbuf_evict_lock)); 525dcbf3bd6SGeorge Wilson 526dcbf3bd6SGeorge Wilson dmu_buf_impl_t *db = multilist_sublist_tail(mls); 527dcbf3bd6SGeorge Wilson while (db != NULL && mutex_tryenter(&db->db_mtx) == 0) { 528dcbf3bd6SGeorge Wilson db = multilist_sublist_prev(mls, db); 529dcbf3bd6SGeorge Wilson } 530dcbf3bd6SGeorge Wilson 531dcbf3bd6SGeorge Wilson DTRACE_PROBE2(dbuf__evict__one, dmu_buf_impl_t *, db, 532dcbf3bd6SGeorge Wilson multilist_sublist_t *, mls); 533dcbf3bd6SGeorge Wilson 534dcbf3bd6SGeorge Wilson if (db != NULL) { 535dcbf3bd6SGeorge Wilson multilist_sublist_remove(mls, db); 536dcbf3bd6SGeorge Wilson multilist_sublist_unlock(mls); 537e914ace2STim Schumacher (void) zfs_refcount_remove_many( 538e914ace2STim Schumacher &dbuf_caches[DB_DBUF_CACHE].size, 539dcbf3bd6SGeorge Wilson db->db.db_size, db); 540adb52d92SMatthew Ahrens ASSERT3U(db->db_caching_status, ==, DB_DBUF_CACHE); 541adb52d92SMatthew Ahrens db->db_caching_status = DB_NO_CACHE; 542ea8dc4b6Seschrock dbuf_destroy(db); 543dcbf3bd6SGeorge Wilson } else { 544dcbf3bd6SGeorge Wilson multilist_sublist_unlock(mls); 545dcbf3bd6SGeorge Wilson } 546dcbf3bd6SGeorge Wilson } 547dcbf3bd6SGeorge Wilson 548dcbf3bd6SGeorge Wilson /* 549dcbf3bd6SGeorge Wilson * The dbuf evict thread is responsible for aging out dbufs from the 550dcbf3bd6SGeorge Wilson * cache. Once the cache has reached it's maximum size, dbufs are removed 551dcbf3bd6SGeorge Wilson * and destroyed. The eviction thread will continue running until the size 552dcbf3bd6SGeorge Wilson * of the dbuf cache is at or below the maximum size. Once the dbuf is aged 553dcbf3bd6SGeorge Wilson * out of the cache it is destroyed and becomes eligible for arc eviction. 554dcbf3bd6SGeorge Wilson */ 5553f7978d0SAlan Somers /* ARGSUSED */ 556dcbf3bd6SGeorge Wilson static void 5573f7978d0SAlan Somers dbuf_evict_thread(void *unused) 558dcbf3bd6SGeorge Wilson { 559dcbf3bd6SGeorge Wilson callb_cpr_t cpr; 560dcbf3bd6SGeorge Wilson 561dcbf3bd6SGeorge Wilson CALLB_CPR_INIT(&cpr, &dbuf_evict_lock, callb_generic_cpr, FTAG); 562dcbf3bd6SGeorge Wilson 563dcbf3bd6SGeorge Wilson mutex_enter(&dbuf_evict_lock); 564dcbf3bd6SGeorge Wilson while (!dbuf_evict_thread_exit) { 565dcbf3bd6SGeorge Wilson while (!dbuf_cache_above_lowater() && !dbuf_evict_thread_exit) { 566dcbf3bd6SGeorge Wilson CALLB_CPR_SAFE_BEGIN(&cpr); 567dcbf3bd6SGeorge Wilson (void) cv_timedwait_hires(&dbuf_evict_cv, 568dcbf3bd6SGeorge Wilson &dbuf_evict_lock, SEC2NSEC(1), MSEC2NSEC(1), 0); 569dcbf3bd6SGeorge Wilson CALLB_CPR_SAFE_END(&cpr, &dbuf_evict_lock); 570dcbf3bd6SGeorge Wilson } 571dcbf3bd6SGeorge Wilson mutex_exit(&dbuf_evict_lock); 572dcbf3bd6SGeorge Wilson 573dcbf3bd6SGeorge Wilson /* 574dcbf3bd6SGeorge Wilson * Keep evicting as long as we're above the low water mark 575dcbf3bd6SGeorge Wilson * for the cache. We do this without holding the locks to 576dcbf3bd6SGeorge Wilson * minimize lock contention. 577dcbf3bd6SGeorge Wilson */ 578dcbf3bd6SGeorge Wilson while (dbuf_cache_above_lowater() && !dbuf_evict_thread_exit) { 579dcbf3bd6SGeorge Wilson dbuf_evict_one(); 580dcbf3bd6SGeorge Wilson } 581dcbf3bd6SGeorge Wilson 582dcbf3bd6SGeorge Wilson mutex_enter(&dbuf_evict_lock); 583dcbf3bd6SGeorge Wilson } 584dcbf3bd6SGeorge Wilson 585dcbf3bd6SGeorge Wilson dbuf_evict_thread_exit = B_FALSE; 586dcbf3bd6SGeorge Wilson cv_broadcast(&dbuf_evict_cv); 587dcbf3bd6SGeorge Wilson CALLB_CPR_EXIT(&cpr); /* drops dbuf_evict_lock */ 588dcbf3bd6SGeorge Wilson thread_exit(); 589dcbf3bd6SGeorge Wilson } 590dcbf3bd6SGeorge Wilson 591dcbf3bd6SGeorge Wilson /* 592dcbf3bd6SGeorge Wilson * Wake up the dbuf eviction thread if the dbuf cache is at its max size. 593dcbf3bd6SGeorge Wilson * If the dbuf cache is at its high water mark, then evict a dbuf from the 594dcbf3bd6SGeorge Wilson * dbuf cache using the callers context. 595dcbf3bd6SGeorge Wilson */ 596dcbf3bd6SGeorge Wilson static void 597dcbf3bd6SGeorge Wilson dbuf_evict_notify(void) 598dcbf3bd6SGeorge Wilson { 599dbfd9f93SMatthew Ahrens /* 600dbfd9f93SMatthew Ahrens * We check if we should evict without holding the dbuf_evict_lock, 601dbfd9f93SMatthew Ahrens * because it's OK to occasionally make the wrong decision here, 602dbfd9f93SMatthew Ahrens * and grabbing the lock results in massive lock contention. 603dbfd9f93SMatthew Ahrens */ 604e914ace2STim Schumacher if (zfs_refcount_count(&dbuf_caches[DB_DBUF_CACHE].size) > 605adb52d92SMatthew Ahrens dbuf_cache_max_bytes) { 606dbfd9f93SMatthew Ahrens if (dbuf_cache_above_hiwater()) 607dcbf3bd6SGeorge Wilson dbuf_evict_one(); 608dbfd9f93SMatthew Ahrens cv_signal(&dbuf_evict_cv); 609dcbf3bd6SGeorge Wilson } 610ea8dc4b6Seschrock } 611ea8dc4b6Seschrock 612ea8dc4b6Seschrock void 613fa9e4066Sahrens dbuf_init(void) 614fa9e4066Sahrens { 615ea8dc4b6Seschrock uint64_t hsize = 1ULL << 16; 616fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 617fa9e4066Sahrens int i; 618fa9e4066Sahrens 619fa9e4066Sahrens /* 620fa9e4066Sahrens * The hash table is big enough to fill all of physical memory 621ea8dc4b6Seschrock * with an average 4K block size. The table will take up 622ea8dc4b6Seschrock * totalmem*sizeof(void*)/4K (i.e. 2MB/GB with 8-byte pointers). 623fa9e4066Sahrens */ 624ea8dc4b6Seschrock while (hsize * 4096 < physmem * PAGESIZE) 625fa9e4066Sahrens hsize <<= 1; 626fa9e4066Sahrens 627ea8dc4b6Seschrock retry: 628fa9e4066Sahrens h->hash_table_mask = hsize - 1; 629ea8dc4b6Seschrock h->hash_table = kmem_zalloc(hsize * sizeof (void *), KM_NOSLEEP); 630ea8dc4b6Seschrock if (h->hash_table == NULL) { 631ea8dc4b6Seschrock /* XXX - we should really return an error instead of assert */ 632ea8dc4b6Seschrock ASSERT(hsize > (1ULL << 10)); 633ea8dc4b6Seschrock hsize >>= 1; 634ea8dc4b6Seschrock goto retry; 635ea8dc4b6Seschrock } 636fa9e4066Sahrens 637dcbf3bd6SGeorge Wilson dbuf_kmem_cache = kmem_cache_create("dmu_buf_impl_t", 638fa9e4066Sahrens sizeof (dmu_buf_impl_t), 639fa9e4066Sahrens 0, dbuf_cons, dbuf_dest, NULL, NULL, NULL, 0); 640fa9e4066Sahrens 641fa9e4066Sahrens for (i = 0; i < DBUF_MUTEXES; i++) 642fa9e4066Sahrens mutex_init(&h->hash_mutexes[i], NULL, MUTEX_DEFAULT, NULL); 643bc9014e6SJustin Gibbs 644bc9014e6SJustin Gibbs /* 645adb52d92SMatthew Ahrens * Setup the parameters for the dbuf caches. We set the sizes of the 646adb52d92SMatthew Ahrens * dbuf cache and the metadata cache to 1/32nd and 1/16th (default) 647adb52d92SMatthew Ahrens * of the size of the ARC, respectively. If the values are set in 648adb52d92SMatthew Ahrens * /etc/system and they're not greater than the size of the ARC, then 649adb52d92SMatthew Ahrens * we honor that value. 650dcbf3bd6SGeorge Wilson */ 651268bbb2aSGeorge Wilson if (dbuf_cache_max_bytes == 0 || 652268bbb2aSGeorge Wilson dbuf_cache_max_bytes >= arc_max_bytes()) { 653268bbb2aSGeorge Wilson dbuf_cache_max_bytes = arc_max_bytes() >> dbuf_cache_shift; 654268bbb2aSGeorge Wilson } 655adb52d92SMatthew Ahrens if (dbuf_metadata_cache_max_bytes == 0 || 656adb52d92SMatthew Ahrens dbuf_metadata_cache_max_bytes >= arc_max_bytes()) { 657adb52d92SMatthew Ahrens dbuf_metadata_cache_max_bytes = 658adb52d92SMatthew Ahrens arc_max_bytes() >> dbuf_metadata_cache_shift; 659adb52d92SMatthew Ahrens } 660dcbf3bd6SGeorge Wilson 661dcbf3bd6SGeorge Wilson /* 662bc9014e6SJustin Gibbs * All entries are queued via taskq_dispatch_ent(), so min/maxalloc 663bc9014e6SJustin Gibbs * configuration is not required. 664bc9014e6SJustin Gibbs */ 665bc9014e6SJustin Gibbs dbu_evict_taskq = taskq_create("dbu_evict", 1, minclsyspri, 0, 0, 0); 666dcbf3bd6SGeorge Wilson 667adb52d92SMatthew Ahrens for (dbuf_cached_state_t dcs = 0; dcs < DB_CACHE_MAX; dcs++) { 668adb52d92SMatthew Ahrens dbuf_caches[dcs].cache = 669adb52d92SMatthew Ahrens multilist_create(sizeof (dmu_buf_impl_t), 670dcbf3bd6SGeorge Wilson offsetof(dmu_buf_impl_t, db_cache_link), 671dcbf3bd6SGeorge Wilson dbuf_cache_multilist_index_func); 672e914ace2STim Schumacher zfs_refcount_create(&dbuf_caches[dcs].size); 673adb52d92SMatthew Ahrens } 674dcbf3bd6SGeorge Wilson 675dcbf3bd6SGeorge Wilson dbuf_evict_thread_exit = B_FALSE; 676dcbf3bd6SGeorge Wilson mutex_init(&dbuf_evict_lock, NULL, MUTEX_DEFAULT, NULL); 677dcbf3bd6SGeorge Wilson cv_init(&dbuf_evict_cv, NULL, CV_DEFAULT, NULL); 678dcbf3bd6SGeorge Wilson dbuf_cache_evict_thread = thread_create(NULL, 0, dbuf_evict_thread, 679dcbf3bd6SGeorge Wilson NULL, 0, &p0, TS_RUN, minclsyspri); 680fa9e4066Sahrens } 681fa9e4066Sahrens 682fa9e4066Sahrens void 683fa9e4066Sahrens dbuf_fini(void) 684fa9e4066Sahrens { 685fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 686fa9e4066Sahrens int i; 687fa9e4066Sahrens 688fa9e4066Sahrens for (i = 0; i < DBUF_MUTEXES; i++) 689fa9e4066Sahrens mutex_destroy(&h->hash_mutexes[i]); 690fa9e4066Sahrens kmem_free(h->hash_table, (h->hash_table_mask + 1) * sizeof (void *)); 691dcbf3bd6SGeorge Wilson kmem_cache_destroy(dbuf_kmem_cache); 692bc9014e6SJustin Gibbs taskq_destroy(dbu_evict_taskq); 693dcbf3bd6SGeorge Wilson 694dcbf3bd6SGeorge Wilson mutex_enter(&dbuf_evict_lock); 695dcbf3bd6SGeorge Wilson dbuf_evict_thread_exit = B_TRUE; 696dcbf3bd6SGeorge Wilson while (dbuf_evict_thread_exit) { 697dcbf3bd6SGeorge Wilson cv_signal(&dbuf_evict_cv); 698dcbf3bd6SGeorge Wilson cv_wait(&dbuf_evict_cv, &dbuf_evict_lock); 699dcbf3bd6SGeorge Wilson } 700dcbf3bd6SGeorge Wilson mutex_exit(&dbuf_evict_lock); 701dcbf3bd6SGeorge Wilson 702dcbf3bd6SGeorge Wilson mutex_destroy(&dbuf_evict_lock); 703dcbf3bd6SGeorge Wilson cv_destroy(&dbuf_evict_cv); 704dcbf3bd6SGeorge Wilson 705adb52d92SMatthew Ahrens for (dbuf_cached_state_t dcs = 0; dcs < DB_CACHE_MAX; dcs++) { 706e914ace2STim Schumacher zfs_refcount_destroy(&dbuf_caches[dcs].size); 707adb52d92SMatthew Ahrens multilist_destroy(dbuf_caches[dcs].cache); 708adb52d92SMatthew Ahrens } 709fa9e4066Sahrens } 710fa9e4066Sahrens 711fa9e4066Sahrens /* 712fa9e4066Sahrens * Other stuff. 713fa9e4066Sahrens */ 714fa9e4066Sahrens 7159c9dc39aSek110237 #ifdef ZFS_DEBUG 716fa9e4066Sahrens static void 717fa9e4066Sahrens dbuf_verify(dmu_buf_impl_t *db) 718fa9e4066Sahrens { 719744947dcSTom Erickson dnode_t *dn; 720b24ab676SJeff Bonwick dbuf_dirty_record_t *dr; 721fa9e4066Sahrens 722fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 723fa9e4066Sahrens 724fa9e4066Sahrens if (!(zfs_flags & ZFS_DEBUG_DBUF_VERIFY)) 725fa9e4066Sahrens return; 726fa9e4066Sahrens 727fa9e4066Sahrens ASSERT(db->db_objset != NULL); 728744947dcSTom Erickson DB_DNODE_ENTER(db); 729744947dcSTom Erickson dn = DB_DNODE(db); 730fa9e4066Sahrens if (dn == NULL) { 731fa9e4066Sahrens ASSERT(db->db_parent == NULL); 732fa9e4066Sahrens ASSERT(db->db_blkptr == NULL); 733fa9e4066Sahrens } else { 734fa9e4066Sahrens ASSERT3U(db->db.db_object, ==, dn->dn_object); 735fa9e4066Sahrens ASSERT3P(db->db_objset, ==, dn->dn_objset); 736fa9e4066Sahrens ASSERT3U(db->db_level, <, dn->dn_nlevels); 737744947dcSTom Erickson ASSERT(db->db_blkid == DMU_BONUS_BLKID || 738744947dcSTom Erickson db->db_blkid == DMU_SPILL_BLKID || 7390f6d88adSAlex Reece !avl_is_empty(&dn->dn_dbufs)); 740fa9e4066Sahrens } 7410a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 742fa9e4066Sahrens ASSERT(dn != NULL); 7431934e92fSmaybee ASSERT3U(db->db.db_size, >=, dn->dn_bonuslen); 7440a586ceaSMark Shellenbaum ASSERT3U(db->db.db_offset, ==, DMU_BONUS_BLKID); 7450a586ceaSMark Shellenbaum } else if (db->db_blkid == DMU_SPILL_BLKID) { 7460a586ceaSMark Shellenbaum ASSERT(dn != NULL); 747fb09f5aaSMadhav Suresh ASSERT0(db->db.db_offset); 748fa9e4066Sahrens } else { 749fa9e4066Sahrens ASSERT3U(db->db.db_offset, ==, db->db_blkid * db->db.db_size); 750fa9e4066Sahrens } 751fa9e4066Sahrens 752b24ab676SJeff Bonwick for (dr = db->db_data_pending; dr != NULL; dr = dr->dr_next) 753b24ab676SJeff Bonwick ASSERT(dr->dr_dbuf == db); 754b24ab676SJeff Bonwick 755b24ab676SJeff Bonwick for (dr = db->db_last_dirty; dr != NULL; dr = dr->dr_next) 756b24ab676SJeff Bonwick ASSERT(dr->dr_dbuf == db); 757b24ab676SJeff Bonwick 75888b7b0f2SMatthew Ahrens /* 75988b7b0f2SMatthew Ahrens * We can't assert that db_size matches dn_datablksz because it 76088b7b0f2SMatthew Ahrens * can be momentarily different when another thread is doing 76188b7b0f2SMatthew Ahrens * dnode_set_blksz(). 76288b7b0f2SMatthew Ahrens */ 76388b7b0f2SMatthew Ahrens if (db->db_level == 0 && db->db.db_object == DMU_META_DNODE_OBJECT) { 764b24ab676SJeff Bonwick dr = db->db_data_pending; 765fa9e4066Sahrens /* 76688b7b0f2SMatthew Ahrens * It should only be modified in syncing context, so 76788b7b0f2SMatthew Ahrens * make sure we only have one copy of the data. 768fa9e4066Sahrens */ 769c717a561Smaybee ASSERT(dr == NULL || dr->dt.dl.dr_data == db->db_buf); 770fa9e4066Sahrens } 771fa9e4066Sahrens 772fa9e4066Sahrens /* verify db->db_blkptr */ 773fa9e4066Sahrens if (db->db_blkptr) { 774fa9e4066Sahrens if (db->db_parent == dn->dn_dbuf) { 775fa9e4066Sahrens /* db is pointed to by the dnode */ 776fa9e4066Sahrens /* ASSERT3U(db->db_blkid, <, dn->dn_nblkptr); */ 77714843421SMatthew Ahrens if (DMU_OBJECT_IS_SPECIAL(db->db.db_object)) 778fa9e4066Sahrens ASSERT(db->db_parent == NULL); 779fa9e4066Sahrens else 780fa9e4066Sahrens ASSERT(db->db_parent != NULL); 7810a586ceaSMark Shellenbaum if (db->db_blkid != DMU_SPILL_BLKID) 782fa9e4066Sahrens ASSERT3P(db->db_blkptr, ==, 783fa9e4066Sahrens &dn->dn_phys->dn_blkptr[db->db_blkid]); 784fa9e4066Sahrens } else { 785fa9e4066Sahrens /* db is pointed to by an indirect block */ 786fa9e4066Sahrens int epb = db->db_parent->db.db_size >> SPA_BLKPTRSHIFT; 787fa9e4066Sahrens ASSERT3U(db->db_parent->db_level, ==, db->db_level+1); 788fa9e4066Sahrens ASSERT3U(db->db_parent->db.db_object, ==, 789fa9e4066Sahrens db->db.db_object); 790fa9e4066Sahrens /* 791fa9e4066Sahrens * dnode_grow_indblksz() can make this fail if we don't 792fa9e4066Sahrens * have the struct_rwlock. XXX indblksz no longer 793fa9e4066Sahrens * grows. safe to do this now? 794fa9e4066Sahrens */ 795744947dcSTom Erickson if (RW_WRITE_HELD(&dn->dn_struct_rwlock)) { 796fa9e4066Sahrens ASSERT3P(db->db_blkptr, ==, 797fa9e4066Sahrens ((blkptr_t *)db->db_parent->db.db_data + 798fa9e4066Sahrens db->db_blkid % epb)); 799fa9e4066Sahrens } 800fa9e4066Sahrens } 801fa9e4066Sahrens } 802fa9e4066Sahrens if ((db->db_blkptr == NULL || BP_IS_HOLE(db->db_blkptr)) && 8033f9d6ad7SLin Ling (db->db_buf == NULL || db->db_buf->b_data) && 8040a586ceaSMark Shellenbaum db->db.db_data && db->db_blkid != DMU_BONUS_BLKID && 805fa9e4066Sahrens db->db_state != DB_FILL && !dn->dn_free_txg) { 806fa9e4066Sahrens /* 807fa9e4066Sahrens * If the blkptr isn't set but they have nonzero data, 808fa9e4066Sahrens * it had better be dirty, otherwise we'll lose that 809fa9e4066Sahrens * data when we evict this buffer. 8108df0bcf0SPaul Dagnelie * 8118df0bcf0SPaul Dagnelie * There is an exception to this rule for indirect blocks; in 8128df0bcf0SPaul Dagnelie * this case, if the indirect block is a hole, we fill in a few 8138df0bcf0SPaul Dagnelie * fields on each of the child blocks (importantly, birth time) 8148df0bcf0SPaul Dagnelie * to prevent hole birth times from being lost when you 8158df0bcf0SPaul Dagnelie * partially fill in a hole. 816fa9e4066Sahrens */ 817fa9e4066Sahrens if (db->db_dirtycnt == 0) { 8188df0bcf0SPaul Dagnelie if (db->db_level == 0) { 819fa9e4066Sahrens uint64_t *buf = db->db.db_data; 820fa9e4066Sahrens int i; 821fa9e4066Sahrens 822fa9e4066Sahrens for (i = 0; i < db->db.db_size >> 3; i++) { 823fa9e4066Sahrens ASSERT(buf[i] == 0); 824fa9e4066Sahrens } 8258df0bcf0SPaul Dagnelie } else { 8268df0bcf0SPaul Dagnelie blkptr_t *bps = db->db.db_data; 8278df0bcf0SPaul Dagnelie ASSERT3U(1 << DB_DNODE(db)->dn_indblkshift, ==, 8288df0bcf0SPaul Dagnelie db->db.db_size); 8298df0bcf0SPaul Dagnelie /* 8308df0bcf0SPaul Dagnelie * We want to verify that all the blkptrs in the 8318df0bcf0SPaul Dagnelie * indirect block are holes, but we may have 8328df0bcf0SPaul Dagnelie * automatically set up a few fields for them. 8338df0bcf0SPaul Dagnelie * We iterate through each blkptr and verify 8348df0bcf0SPaul Dagnelie * they only have those fields set. 8358df0bcf0SPaul Dagnelie */ 8368df0bcf0SPaul Dagnelie for (int i = 0; 8378df0bcf0SPaul Dagnelie i < db->db.db_size / sizeof (blkptr_t); 8388df0bcf0SPaul Dagnelie i++) { 8398df0bcf0SPaul Dagnelie blkptr_t *bp = &bps[i]; 8408df0bcf0SPaul Dagnelie ASSERT(ZIO_CHECKSUM_IS_ZERO( 8418df0bcf0SPaul Dagnelie &bp->blk_cksum)); 8428df0bcf0SPaul Dagnelie ASSERT( 8438df0bcf0SPaul Dagnelie DVA_IS_EMPTY(&bp->blk_dva[0]) && 8448df0bcf0SPaul Dagnelie DVA_IS_EMPTY(&bp->blk_dva[1]) && 8458df0bcf0SPaul Dagnelie DVA_IS_EMPTY(&bp->blk_dva[2])); 8468df0bcf0SPaul Dagnelie ASSERT0(bp->blk_fill); 8478df0bcf0SPaul Dagnelie ASSERT0(bp->blk_pad[0]); 8488df0bcf0SPaul Dagnelie ASSERT0(bp->blk_pad[1]); 8498df0bcf0SPaul Dagnelie ASSERT(!BP_IS_EMBEDDED(bp)); 8508df0bcf0SPaul Dagnelie ASSERT(BP_IS_HOLE(bp)); 8518df0bcf0SPaul Dagnelie ASSERT0(bp->blk_phys_birth); 8528df0bcf0SPaul Dagnelie } 8538df0bcf0SPaul Dagnelie } 854fa9e4066Sahrens } 855fa9e4066Sahrens } 856744947dcSTom Erickson DB_DNODE_EXIT(db); 857fa9e4066Sahrens } 8589c9dc39aSek110237 #endif 859fa9e4066Sahrens 860fa9e4066Sahrens static void 861bc9014e6SJustin Gibbs dbuf_clear_data(dmu_buf_impl_t *db) 862fa9e4066Sahrens { 863fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 864ea8dc4b6Seschrock dbuf_evict_user(db); 865dcbf3bd6SGeorge Wilson ASSERT3P(db->db_buf, ==, NULL); 866ea8dc4b6Seschrock db->db.db_data = NULL; 86782c9918fSTim Haley if (db->db_state != DB_NOFILL) 868ea8dc4b6Seschrock db->db_state = DB_UNCACHED; 869ea8dc4b6Seschrock } 870bc9014e6SJustin Gibbs 871bc9014e6SJustin Gibbs static void 872bc9014e6SJustin Gibbs dbuf_set_data(dmu_buf_impl_t *db, arc_buf_t *buf) 873bc9014e6SJustin Gibbs { 874bc9014e6SJustin Gibbs ASSERT(MUTEX_HELD(&db->db_mtx)); 875bc9014e6SJustin Gibbs ASSERT(buf != NULL); 876bc9014e6SJustin Gibbs 877bc9014e6SJustin Gibbs db->db_buf = buf; 878bc9014e6SJustin Gibbs ASSERT(buf->b_data != NULL); 879bc9014e6SJustin Gibbs db->db.db_data = buf->b_data; 880fa9e4066Sahrens } 881fa9e4066Sahrens 882c242f9a0Schunli zhang - Sun Microsystems - Irvine United States /* 883c242f9a0Schunli zhang - Sun Microsystems - Irvine United States * Loan out an arc_buf for read. Return the loaned arc_buf. 884c242f9a0Schunli zhang - Sun Microsystems - Irvine United States */ 885c242f9a0Schunli zhang - Sun Microsystems - Irvine United States arc_buf_t * 886c242f9a0Schunli zhang - Sun Microsystems - Irvine United States dbuf_loan_arcbuf(dmu_buf_impl_t *db) 887c242f9a0Schunli zhang - Sun Microsystems - Irvine United States { 888c242f9a0Schunli zhang - Sun Microsystems - Irvine United States arc_buf_t *abuf; 889c242f9a0Schunli zhang - Sun Microsystems - Irvine United States 890dcbf3bd6SGeorge Wilson ASSERT(db->db_blkid != DMU_BONUS_BLKID); 891c242f9a0Schunli zhang - Sun Microsystems - Irvine United States mutex_enter(&db->db_mtx); 892e914ace2STim Schumacher if (arc_released(db->db_buf) || zfs_refcount_count(&db->db_holds) > 1) { 893c242f9a0Schunli zhang - Sun Microsystems - Irvine United States int blksz = db->db.db_size; 89443466aaeSMax Grossman spa_t *spa = db->db_objset->os_spa; 895744947dcSTom Erickson 896c242f9a0Schunli zhang - Sun Microsystems - Irvine United States mutex_exit(&db->db_mtx); 8975602294fSDan Kimmel abuf = arc_loan_buf(spa, B_FALSE, blksz); 898c242f9a0Schunli zhang - Sun Microsystems - Irvine United States bcopy(db->db.db_data, abuf->b_data, blksz); 899c242f9a0Schunli zhang - Sun Microsystems - Irvine United States } else { 900c242f9a0Schunli zhang - Sun Microsystems - Irvine United States abuf = db->db_buf; 901c242f9a0Schunli zhang - Sun Microsystems - Irvine United States arc_loan_inuse_buf(abuf, db); 902dcbf3bd6SGeorge Wilson db->db_buf = NULL; 903bc9014e6SJustin Gibbs dbuf_clear_data(db); 904c242f9a0Schunli zhang - Sun Microsystems - Irvine United States mutex_exit(&db->db_mtx); 905c242f9a0Schunli zhang - Sun Microsystems - Irvine United States } 906c242f9a0Schunli zhang - Sun Microsystems - Irvine United States return (abuf); 907c242f9a0Schunli zhang - Sun Microsystems - Irvine United States } 908c242f9a0Schunli zhang - Sun Microsystems - Irvine United States 909a2cdcdd2SPaul Dagnelie /* 910a2cdcdd2SPaul Dagnelie * Calculate which level n block references the data at the level 0 offset 911a2cdcdd2SPaul Dagnelie * provided. 912a2cdcdd2SPaul Dagnelie */ 913fa9e4066Sahrens uint64_t 914a2cdcdd2SPaul Dagnelie dbuf_whichblock(dnode_t *dn, int64_t level, uint64_t offset) 915fa9e4066Sahrens { 916a2cdcdd2SPaul Dagnelie if (dn->dn_datablkshift != 0 && dn->dn_indblkshift != 0) { 917a2cdcdd2SPaul Dagnelie /* 918a2cdcdd2SPaul Dagnelie * The level n blkid is equal to the level 0 blkid divided by 919a2cdcdd2SPaul Dagnelie * the number of level 0s in a level n block. 920a2cdcdd2SPaul Dagnelie * 921a2cdcdd2SPaul Dagnelie * The level 0 blkid is offset >> datablkshift = 922a2cdcdd2SPaul Dagnelie * offset / 2^datablkshift. 923a2cdcdd2SPaul Dagnelie * 924a2cdcdd2SPaul Dagnelie * The number of level 0s in a level n is the number of block 925a2cdcdd2SPaul Dagnelie * pointers in an indirect block, raised to the power of level. 926a2cdcdd2SPaul Dagnelie * This is 2^(indblkshift - SPA_BLKPTRSHIFT)^level = 927a2cdcdd2SPaul Dagnelie * 2^(level*(indblkshift - SPA_BLKPTRSHIFT)). 928a2cdcdd2SPaul Dagnelie * 929a2cdcdd2SPaul Dagnelie * Thus, the level n blkid is: offset / 930a2cdcdd2SPaul Dagnelie * ((2^datablkshift)*(2^(level*(indblkshift - SPA_BLKPTRSHIFT))) 931a2cdcdd2SPaul Dagnelie * = offset / 2^(datablkshift + level * 932a2cdcdd2SPaul Dagnelie * (indblkshift - SPA_BLKPTRSHIFT)) 933a2cdcdd2SPaul Dagnelie * = offset >> (datablkshift + level * 934a2cdcdd2SPaul Dagnelie * (indblkshift - SPA_BLKPTRSHIFT)) 935a2cdcdd2SPaul Dagnelie */ 936a2cdcdd2SPaul Dagnelie return (offset >> (dn->dn_datablkshift + level * 937a2cdcdd2SPaul Dagnelie (dn->dn_indblkshift - SPA_BLKPTRSHIFT))); 938fa9e4066Sahrens } else { 939fa9e4066Sahrens ASSERT3U(offset, <, dn->dn_datablksz); 940fa9e4066Sahrens return (0); 941fa9e4066Sahrens } 942fa9e4066Sahrens } 943fa9e4066Sahrens 944fa9e4066Sahrens static void 945fa9e4066Sahrens dbuf_read_done(zio_t *zio, arc_buf_t *buf, void *vdb) 946fa9e4066Sahrens { 947fa9e4066Sahrens dmu_buf_impl_t *db = vdb; 948fa9e4066Sahrens 949fa9e4066Sahrens mutex_enter(&db->db_mtx); 950fa9e4066Sahrens ASSERT3U(db->db_state, ==, DB_READ); 951fa9e4066Sahrens /* 952fa9e4066Sahrens * All reads are synchronous, so we must have a hold on the dbuf 953fa9e4066Sahrens */ 954e914ace2STim Schumacher ASSERT(zfs_refcount_count(&db->db_holds) > 0); 955ea8dc4b6Seschrock ASSERT(db->db_buf == NULL); 956fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 957fa98e487SMatthew Ahrens if (buf == NULL) { 958fa98e487SMatthew Ahrens /* i/o error */ 959fa98e487SMatthew Ahrens ASSERT(zio == NULL || zio->io_error != 0); 960fa98e487SMatthew Ahrens ASSERT(db->db_blkid != DMU_BONUS_BLKID); 961fa98e487SMatthew Ahrens ASSERT3P(db->db_buf, ==, NULL); 962fa98e487SMatthew Ahrens db->db_state = DB_UNCACHED; 963fa98e487SMatthew Ahrens } else if (db->db_level == 0 && db->db_freed_in_flight) { 964fa98e487SMatthew Ahrens /* freed in flight */ 965fa98e487SMatthew Ahrens ASSERT(zio == NULL || zio->io_error == 0); 966fa9e4066Sahrens arc_release(buf, db); 967fa9e4066Sahrens bzero(buf->b_data, db->db.db_size); 9686b4acc8bSahrens arc_buf_freeze(buf); 969c717a561Smaybee db->db_freed_in_flight = FALSE; 970fa9e4066Sahrens dbuf_set_data(db, buf); 971fa9e4066Sahrens db->db_state = DB_CACHED; 972fa98e487SMatthew Ahrens } else { 973fa98e487SMatthew Ahrens /* success */ 974fa98e487SMatthew Ahrens ASSERT(zio == NULL || zio->io_error == 0); 975fa9e4066Sahrens dbuf_set_data(db, buf); 976fa9e4066Sahrens db->db_state = DB_CACHED; 977fa9e4066Sahrens } 978fa9e4066Sahrens cv_broadcast(&db->db_changed); 979c2919acbSMatthew Ahrens dbuf_rele_and_unlock(db, NULL, B_FALSE); 980fa9e4066Sahrens } 981fa9e4066Sahrens 982ea8dc4b6Seschrock static void 983cf6106c8SMatthew Ahrens dbuf_read_impl(dmu_buf_impl_t *db, zio_t *zio, uint32_t flags) 984fa9e4066Sahrens { 985744947dcSTom Erickson dnode_t *dn; 9867802d7bfSMatthew Ahrens zbookmark_phys_t zb; 9877adb730bSGeorge Wilson arc_flags_t aflags = ARC_FLAG_NOWAIT; 988fa9e4066Sahrens 989744947dcSTom Erickson DB_DNODE_ENTER(db); 990744947dcSTom Erickson dn = DB_DNODE(db); 991e914ace2STim Schumacher ASSERT(!zfs_refcount_is_zero(&db->db_holds)); 992fa9e4066Sahrens /* We need the struct_rwlock to prevent db_blkptr from changing. */ 993088f3894Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 994ea8dc4b6Seschrock ASSERT(MUTEX_HELD(&db->db_mtx)); 995ea8dc4b6Seschrock ASSERT(db->db_state == DB_UNCACHED); 996ea8dc4b6Seschrock ASSERT(db->db_buf == NULL); 997fa9e4066Sahrens 9980a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 99954811da5SToomas Soome /* 100054811da5SToomas Soome * The bonus length stored in the dnode may be less than 100154811da5SToomas Soome * the maximum available space in the bonus buffer. 100254811da5SToomas Soome */ 1003cf04dda1SMark Maybee int bonuslen = MIN(dn->dn_bonuslen, dn->dn_phys->dn_bonuslen); 100454811da5SToomas Soome int max_bonuslen = DN_SLOTS_TO_BONUSLEN(dn->dn_num_slots); 10051934e92fSmaybee 10061934e92fSmaybee ASSERT3U(bonuslen, <=, db->db.db_size); 100754811da5SToomas Soome db->db.db_data = zio_buf_alloc(max_bonuslen); 100854811da5SToomas Soome arc_space_consume(max_bonuslen, ARC_SPACE_BONUS); 100954811da5SToomas Soome if (bonuslen < max_bonuslen) 101054811da5SToomas Soome bzero(db->db.db_data, max_bonuslen); 1011cf04dda1SMark Maybee if (bonuslen) 1012cf04dda1SMark Maybee bcopy(DN_BONUS(dn->dn_phys), db->db.db_data, bonuslen); 1013744947dcSTom Erickson DB_DNODE_EXIT(db); 1014fa9e4066Sahrens db->db_state = DB_CACHED; 1015fa9e4066Sahrens mutex_exit(&db->db_mtx); 1016fa9e4066Sahrens return; 1017fa9e4066Sahrens } 1018fa9e4066Sahrens 10191c8564a7SMark Maybee /* 10201c8564a7SMark Maybee * Recheck BP_IS_HOLE() after dnode_block_freed() in case dnode_sync() 10211c8564a7SMark Maybee * processes the delete record and clears the bp while we are waiting 10221c8564a7SMark Maybee * for the dn_mtx (resulting in a "no" from block_freed). 10231c8564a7SMark Maybee */ 1024088f3894Sahrens if (db->db_blkptr == NULL || BP_IS_HOLE(db->db_blkptr) || 10251c8564a7SMark Maybee (db->db_level == 0 && (dnode_block_freed(dn, db->db_blkid) || 10261c8564a7SMark Maybee BP_IS_HOLE(db->db_blkptr)))) { 1027ad23a2dbSjohansen arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 1028ad23a2dbSjohansen 10295602294fSDan Kimmel dbuf_set_data(db, arc_alloc_buf(db->db_objset->os_spa, db, type, 10305602294fSDan Kimmel db->db.db_size)); 1031fa9e4066Sahrens bzero(db->db.db_data, db->db.db_size); 10328df0bcf0SPaul Dagnelie 10338df0bcf0SPaul Dagnelie if (db->db_blkptr != NULL && db->db_level > 0 && 10348df0bcf0SPaul Dagnelie BP_IS_HOLE(db->db_blkptr) && 10358df0bcf0SPaul Dagnelie db->db_blkptr->blk_birth != 0) { 10368df0bcf0SPaul Dagnelie blkptr_t *bps = db->db.db_data; 10378df0bcf0SPaul Dagnelie for (int i = 0; i < ((1 << 10388df0bcf0SPaul Dagnelie DB_DNODE(db)->dn_indblkshift) / sizeof (blkptr_t)); 10398df0bcf0SPaul Dagnelie i++) { 10408df0bcf0SPaul Dagnelie blkptr_t *bp = &bps[i]; 10418df0bcf0SPaul Dagnelie ASSERT3U(BP_GET_LSIZE(db->db_blkptr), ==, 10428df0bcf0SPaul Dagnelie 1 << dn->dn_indblkshift); 10438df0bcf0SPaul Dagnelie BP_SET_LSIZE(bp, 10448df0bcf0SPaul Dagnelie BP_GET_LEVEL(db->db_blkptr) == 1 ? 10458df0bcf0SPaul Dagnelie dn->dn_datablksz : 10468df0bcf0SPaul Dagnelie BP_GET_LSIZE(db->db_blkptr)); 10478df0bcf0SPaul Dagnelie BP_SET_TYPE(bp, BP_GET_TYPE(db->db_blkptr)); 10488df0bcf0SPaul Dagnelie BP_SET_LEVEL(bp, 10498df0bcf0SPaul Dagnelie BP_GET_LEVEL(db->db_blkptr) - 1); 10508df0bcf0SPaul Dagnelie BP_SET_BIRTH(bp, db->db_blkptr->blk_birth, 0); 10518df0bcf0SPaul Dagnelie } 10528df0bcf0SPaul Dagnelie } 10538df0bcf0SPaul Dagnelie DB_DNODE_EXIT(db); 1054fa9e4066Sahrens db->db_state = DB_CACHED; 1055fa9e4066Sahrens mutex_exit(&db->db_mtx); 1056fa9e4066Sahrens return; 1057fa9e4066Sahrens } 1058fa9e4066Sahrens 1059744947dcSTom Erickson DB_DNODE_EXIT(db); 1060744947dcSTom Erickson 1061fa9e4066Sahrens db->db_state = DB_READ; 1062fa9e4066Sahrens mutex_exit(&db->db_mtx); 1063fa9e4066Sahrens 10643baa08fcSek110237 if (DBUF_IS_L2CACHEABLE(db)) 10657adb730bSGeorge Wilson aflags |= ARC_FLAG_L2CACHE; 10663baa08fcSek110237 1067b24ab676SJeff Bonwick SET_BOOKMARK(&zb, db->db_objset->os_dsl_dataset ? 1068b24ab676SJeff Bonwick db->db_objset->os_dsl_dataset->ds_object : DMU_META_OBJSET, 1069b24ab676SJeff Bonwick db->db.db_object, db->db_level, db->db_blkid); 1070ea8dc4b6Seschrock 1071ea8dc4b6Seschrock dbuf_add_ref(db, NULL); 1072088f3894Sahrens 107343466aaeSMax Grossman (void) arc_read(zio, db->db_objset->os_spa, db->db_blkptr, 1074fa9e4066Sahrens dbuf_read_done, db, ZIO_PRIORITY_SYNC_READ, 1075cf6106c8SMatthew Ahrens (flags & DB_RF_CANFAIL) ? ZIO_FLAG_CANFAIL : ZIO_FLAG_MUSTSUCCEED, 107613506d1eSmaybee &aflags, &zb); 1077fa9e4066Sahrens } 1078fa9e4066Sahrens 10795602294fSDan Kimmel /* 10805602294fSDan Kimmel * This is our just-in-time copy function. It makes a copy of buffers that 10815602294fSDan Kimmel * have been modified in a previous transaction group before we access them in 10825602294fSDan Kimmel * the current active group. 10835602294fSDan Kimmel * 10845602294fSDan Kimmel * This function is used in three places: when we are dirtying a buffer for the 10855602294fSDan Kimmel * first time in a txg, when we are freeing a range in a dnode that includes 10865602294fSDan Kimmel * this buffer, and when we are accessing a buffer which was received compressed 10875602294fSDan Kimmel * and later referenced in a WRITE_BYREF record. 10885602294fSDan Kimmel * 10895602294fSDan Kimmel * Note that when we are called from dbuf_free_range() we do not put a hold on 10905602294fSDan Kimmel * the buffer, we just traverse the active dbuf list for the dnode. 10915602294fSDan Kimmel */ 10925602294fSDan Kimmel static void 10935602294fSDan Kimmel dbuf_fix_old_data(dmu_buf_impl_t *db, uint64_t txg) 10945602294fSDan Kimmel { 10955602294fSDan Kimmel dbuf_dirty_record_t *dr = db->db_last_dirty; 10965602294fSDan Kimmel 10975602294fSDan Kimmel ASSERT(MUTEX_HELD(&db->db_mtx)); 10985602294fSDan Kimmel ASSERT(db->db.db_data != NULL); 10995602294fSDan Kimmel ASSERT(db->db_level == 0); 11005602294fSDan Kimmel ASSERT(db->db.db_object != DMU_META_DNODE_OBJECT); 11015602294fSDan Kimmel 11025602294fSDan Kimmel if (dr == NULL || 11035602294fSDan Kimmel (dr->dt.dl.dr_data != 11045602294fSDan Kimmel ((db->db_blkid == DMU_BONUS_BLKID) ? db->db.db_data : db->db_buf))) 11055602294fSDan Kimmel return; 11065602294fSDan Kimmel 11075602294fSDan Kimmel /* 11085602294fSDan Kimmel * If the last dirty record for this dbuf has not yet synced 11095602294fSDan Kimmel * and its referencing the dbuf data, either: 11105602294fSDan Kimmel * reset the reference to point to a new copy, 11115602294fSDan Kimmel * or (if there a no active holders) 11125602294fSDan Kimmel * just null out the current db_data pointer. 11135602294fSDan Kimmel */ 11145602294fSDan Kimmel ASSERT(dr->dr_txg >= txg - 2); 11155602294fSDan Kimmel if (db->db_blkid == DMU_BONUS_BLKID) { 11165602294fSDan Kimmel /* Note that the data bufs here are zio_bufs */ 111754811da5SToomas Soome dnode_t *dn = DB_DNODE(db); 111854811da5SToomas Soome int bonuslen = DN_SLOTS_TO_BONUSLEN(dn->dn_num_slots); 111954811da5SToomas Soome dr->dt.dl.dr_data = zio_buf_alloc(bonuslen); 112054811da5SToomas Soome arc_space_consume(bonuslen, ARC_SPACE_BONUS); 112154811da5SToomas Soome bcopy(db->db.db_data, dr->dt.dl.dr_data, bonuslen); 1122e914ace2STim Schumacher } else if (zfs_refcount_count(&db->db_holds) > db->db_dirtycnt) { 11235602294fSDan Kimmel int size = arc_buf_size(db->db_buf); 11245602294fSDan Kimmel arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 11255602294fSDan Kimmel spa_t *spa = db->db_objset->os_spa; 11265602294fSDan Kimmel enum zio_compress compress_type = 11275602294fSDan Kimmel arc_get_compression(db->db_buf); 11285602294fSDan Kimmel 11295602294fSDan Kimmel if (compress_type == ZIO_COMPRESS_OFF) { 11305602294fSDan Kimmel dr->dt.dl.dr_data = arc_alloc_buf(spa, db, type, size); 11315602294fSDan Kimmel } else { 11325602294fSDan Kimmel ASSERT3U(type, ==, ARC_BUFC_DATA); 11335602294fSDan Kimmel dr->dt.dl.dr_data = arc_alloc_compressed_buf(spa, db, 11345602294fSDan Kimmel size, arc_buf_lsize(db->db_buf), compress_type); 11355602294fSDan Kimmel } 11365602294fSDan Kimmel bcopy(db->db.db_data, dr->dt.dl.dr_data->b_data, size); 11375602294fSDan Kimmel } else { 11385602294fSDan Kimmel db->db_buf = NULL; 11395602294fSDan Kimmel dbuf_clear_data(db); 11405602294fSDan Kimmel } 11415602294fSDan Kimmel } 11425602294fSDan Kimmel 1143ea8dc4b6Seschrock int 1144ea8dc4b6Seschrock dbuf_read(dmu_buf_impl_t *db, zio_t *zio, uint32_t flags) 1145fa9e4066Sahrens { 1146ea8dc4b6Seschrock int err = 0; 114743466aaeSMax Grossman boolean_t prefetch; 1148744947dcSTom Erickson dnode_t *dn; 1149fa9e4066Sahrens 1150fa9e4066Sahrens /* 1151fa9e4066Sahrens * We don't have to hold the mutex to check db_state because it 1152fa9e4066Sahrens * can't be freed while we have a hold on the buffer. 1153fa9e4066Sahrens */ 1154e914ace2STim Schumacher ASSERT(!zfs_refcount_is_zero(&db->db_holds)); 1155fa9e4066Sahrens 115682c9918fSTim Haley if (db->db_state == DB_NOFILL) 1157be6fd75aSMatthew Ahrens return (SET_ERROR(EIO)); 115882c9918fSTim Haley 1159744947dcSTom Erickson DB_DNODE_ENTER(db); 1160744947dcSTom Erickson dn = DB_DNODE(db); 1161fa9e4066Sahrens if ((flags & DB_RF_HAVESTRUCT) == 0) 1162744947dcSTom Erickson rw_enter(&dn->dn_struct_rwlock, RW_READER); 1163fa9e4066Sahrens 11640a586ceaSMark Shellenbaum prefetch = db->db_level == 0 && db->db_blkid != DMU_BONUS_BLKID && 1165744947dcSTom Erickson (flags & DB_RF_NOPREFETCH) == 0 && dn != NULL && 11663baa08fcSek110237 DBUF_IS_CACHEABLE(db); 116713506d1eSmaybee 1168fa9e4066Sahrens mutex_enter(&db->db_mtx); 1169ea8dc4b6Seschrock if (db->db_state == DB_CACHED) { 11705602294fSDan Kimmel /* 11715602294fSDan Kimmel * If the arc buf is compressed, we need to decompress it to 11725602294fSDan Kimmel * read the data. This could happen during the "zfs receive" of 11735602294fSDan Kimmel * a stream which is compressed and deduplicated. 11745602294fSDan Kimmel */ 11755602294fSDan Kimmel if (db->db_buf != NULL && 11765602294fSDan Kimmel arc_get_compression(db->db_buf) != ZIO_COMPRESS_OFF) { 11775602294fSDan Kimmel dbuf_fix_old_data(db, 11785602294fSDan Kimmel spa_syncing_txg(dmu_objset_spa(db->db_objset))); 11795602294fSDan Kimmel err = arc_decompress(db->db_buf); 11805602294fSDan Kimmel dbuf_set_data(db, db->db_buf); 11815602294fSDan Kimmel } 1182ea8dc4b6Seschrock mutex_exit(&db->db_mtx); 118313506d1eSmaybee if (prefetch) 1184cb92f413SAlexander Motin dmu_zfetch(&dn->dn_zfetch, db->db_blkid, 1, B_TRUE); 1185ea8dc4b6Seschrock if ((flags & DB_RF_HAVESTRUCT) == 0) 1186744947dcSTom Erickson rw_exit(&dn->dn_struct_rwlock); 1187744947dcSTom Erickson DB_DNODE_EXIT(db); 1188ea8dc4b6Seschrock } else if (db->db_state == DB_UNCACHED) { 1189744947dcSTom Erickson spa_t *spa = dn->dn_objset->os_spa; 1190def4fac5SMatthew Ahrens boolean_t need_wait = B_FALSE; 1191744947dcSTom Erickson 1192def4fac5SMatthew Ahrens if (zio == NULL && 1193def4fac5SMatthew Ahrens db->db_blkptr != NULL && !BP_IS_HOLE(db->db_blkptr)) { 1194744947dcSTom Erickson zio = zio_root(spa, NULL, NULL, ZIO_FLAG_CANFAIL); 1195def4fac5SMatthew Ahrens need_wait = B_TRUE; 1196def4fac5SMatthew Ahrens } 1197cf6106c8SMatthew Ahrens dbuf_read_impl(db, zio, flags); 119813506d1eSmaybee 1199ea8dc4b6Seschrock /* dbuf_read_impl has dropped db_mtx for us */ 1200ea8dc4b6Seschrock 120113506d1eSmaybee if (prefetch) 1202cb92f413SAlexander Motin dmu_zfetch(&dn->dn_zfetch, db->db_blkid, 1, B_TRUE); 1203ea8dc4b6Seschrock 1204ea8dc4b6Seschrock if ((flags & DB_RF_HAVESTRUCT) == 0) 1205744947dcSTom Erickson rw_exit(&dn->dn_struct_rwlock); 1206744947dcSTom Erickson DB_DNODE_EXIT(db); 1207ea8dc4b6Seschrock 1208def4fac5SMatthew Ahrens if (need_wait) 1209ea8dc4b6Seschrock err = zio_wait(zio); 1210ea8dc4b6Seschrock } else { 12113e30c24aSWill Andrews /* 12123e30c24aSWill Andrews * Another reader came in while the dbuf was in flight 12133e30c24aSWill Andrews * between UNCACHED and CACHED. Either a writer will finish 12143e30c24aSWill Andrews * writing the buffer (sending the dbuf to CACHED) or the 12153e30c24aSWill Andrews * first reader's request will reach the read_done callback 12163e30c24aSWill Andrews * and send the dbuf to CACHED. Otherwise, a failure 12173e30c24aSWill Andrews * occurred and the dbuf went to UNCACHED. 12183e30c24aSWill Andrews */ 121913506d1eSmaybee mutex_exit(&db->db_mtx); 122013506d1eSmaybee if (prefetch) 1221cb92f413SAlexander Motin dmu_zfetch(&dn->dn_zfetch, db->db_blkid, 1, B_TRUE); 1222ea8dc4b6Seschrock if ((flags & DB_RF_HAVESTRUCT) == 0) 1223744947dcSTom Erickson rw_exit(&dn->dn_struct_rwlock); 1224744947dcSTom Erickson DB_DNODE_EXIT(db); 122513506d1eSmaybee 12263e30c24aSWill Andrews /* Skip the wait per the caller's request. */ 122713506d1eSmaybee mutex_enter(&db->db_mtx); 1228ea8dc4b6Seschrock if ((flags & DB_RF_NEVERWAIT) == 0) { 1229ea8dc4b6Seschrock while (db->db_state == DB_READ || 1230ea8dc4b6Seschrock db->db_state == DB_FILL) { 1231fa9e4066Sahrens ASSERT(db->db_state == DB_READ || 1232fa9e4066Sahrens (flags & DB_RF_HAVESTRUCT) == 0); 1233f6164ad6SAdam H. Leventhal DTRACE_PROBE2(blocked__read, dmu_buf_impl_t *, 1234f6164ad6SAdam H. Leventhal db, zio_t *, zio); 1235fa9e4066Sahrens cv_wait(&db->db_changed, &db->db_mtx); 1236fa9e4066Sahrens } 1237ea8dc4b6Seschrock if (db->db_state == DB_UNCACHED) 1238be6fd75aSMatthew Ahrens err = SET_ERROR(EIO); 1239ea8dc4b6Seschrock } 1240fa9e4066Sahrens mutex_exit(&db->db_mtx); 1241fa9e4066Sahrens } 1242fa9e4066Sahrens 1243ea8dc4b6Seschrock return (err); 1244fa9e4066Sahrens } 1245fa9e4066Sahrens 1246fa9e4066Sahrens static void 1247fa9e4066Sahrens dbuf_noread(dmu_buf_impl_t *db) 1248fa9e4066Sahrens { 1249e914ace2STim Schumacher ASSERT(!zfs_refcount_is_zero(&db->db_holds)); 12500a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 1251fa9e4066Sahrens mutex_enter(&db->db_mtx); 1252fa9e4066Sahrens while (db->db_state == DB_READ || db->db_state == DB_FILL) 1253fa9e4066Sahrens cv_wait(&db->db_changed, &db->db_mtx); 1254fa9e4066Sahrens if (db->db_state == DB_UNCACHED) { 1255ad23a2dbSjohansen arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 125643466aaeSMax Grossman spa_t *spa = db->db_objset->os_spa; 1257ad23a2dbSjohansen 1258ea8dc4b6Seschrock ASSERT(db->db_buf == NULL); 1259fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 12605602294fSDan Kimmel dbuf_set_data(db, arc_alloc_buf(spa, db, type, db->db.db_size)); 1261fa9e4066Sahrens db->db_state = DB_FILL; 126282c9918fSTim Haley } else if (db->db_state == DB_NOFILL) { 1263bc9014e6SJustin Gibbs dbuf_clear_data(db); 1264fa9e4066Sahrens } else { 1265fa9e4066Sahrens ASSERT3U(db->db_state, ==, DB_CACHED); 1266fa9e4066Sahrens } 1267fa9e4066Sahrens mutex_exit(&db->db_mtx); 1268fa9e4066Sahrens } 1269fa9e4066Sahrens 1270fa9e4066Sahrens void 1271c717a561Smaybee dbuf_unoverride(dbuf_dirty_record_t *dr) 1272fa9e4066Sahrens { 1273c717a561Smaybee dmu_buf_impl_t *db = dr->dr_dbuf; 1274b24ab676SJeff Bonwick blkptr_t *bp = &dr->dt.dl.dr_overridden_by; 1275c717a561Smaybee uint64_t txg = dr->dr_txg; 1276c5c6ffa0Smaybee 1277c717a561Smaybee ASSERT(MUTEX_HELD(&db->db_mtx)); 127840713f2bSAlan Somers /* 127940713f2bSAlan Somers * This assert is valid because dmu_sync() expects to be called by 128040713f2bSAlan Somers * a zilog's get_data while holding a range lock. This call only 128140713f2bSAlan Somers * comes from dbuf_dirty() callers who must also hold a range lock. 128240713f2bSAlan Somers */ 1283c717a561Smaybee ASSERT(dr->dt.dl.dr_override_state != DR_IN_DMU_SYNC); 1284c717a561Smaybee ASSERT(db->db_level == 0); 1285c717a561Smaybee 12860a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID || 1287c717a561Smaybee dr->dt.dl.dr_override_state == DR_NOT_OVERRIDDEN) 1288c717a561Smaybee return; 1289c717a561Smaybee 1290b24ab676SJeff Bonwick ASSERT(db->db_data_pending != dr); 1291b24ab676SJeff Bonwick 1292fa9e4066Sahrens /* free this block */ 129343466aaeSMax Grossman if (!BP_IS_HOLE(bp) && !dr->dt.dl.dr_nopwrite) 129443466aaeSMax Grossman zio_free(db->db_objset->os_spa, txg, bp); 1295b24ab676SJeff Bonwick 1296c717a561Smaybee dr->dt.dl.dr_override_state = DR_NOT_OVERRIDDEN; 129780901aeaSGeorge Wilson dr->dt.dl.dr_nopwrite = B_FALSE; 129880901aeaSGeorge Wilson 12996b4acc8bSahrens /* 13006b4acc8bSahrens * Release the already-written buffer, so we leave it in 13016b4acc8bSahrens * a consistent dirty state. Note that all callers are 13026b4acc8bSahrens * modifying the buffer, so they will immediately do 13036b4acc8bSahrens * another (redundant) arc_release(). Therefore, leave 13046b4acc8bSahrens * the buf thawed to save the effort of freezing & 13056b4acc8bSahrens * immediately re-thawing it. 13066b4acc8bSahrens */ 1307c717a561Smaybee arc_release(dr->dt.dl.dr_data, db); 1308fa9e4066Sahrens } 1309fa9e4066Sahrens 1310cdb0ab79Smaybee /* 1311cdb0ab79Smaybee * Evict (if its unreferenced) or clear (if its referenced) any level-0 1312cdb0ab79Smaybee * data blocks in the free range, so that any future readers will find 131343466aaeSMax Grossman * empty blocks. 1314cdb0ab79Smaybee */ 1315fa9e4066Sahrens void 13160f6d88adSAlex Reece dbuf_free_range(dnode_t *dn, uint64_t start_blkid, uint64_t end_blkid, 13170f6d88adSAlex Reece dmu_tx_t *tx) 1318fa9e4066Sahrens { 1319bc9014e6SJustin Gibbs dmu_buf_impl_t db_search; 1320bc9014e6SJustin Gibbs dmu_buf_impl_t *db, *db_next; 1321fa9e4066Sahrens uint64_t txg = tx->tx_txg; 13220f6d88adSAlex Reece avl_index_t where; 1323fa9e4066Sahrens 1324653af1b8SStephen Blinick if (end_blkid > dn->dn_maxblkid && 1325653af1b8SStephen Blinick !(start_blkid == DMU_SPILL_BLKID || end_blkid == DMU_SPILL_BLKID)) 13260f6d88adSAlex Reece end_blkid = dn->dn_maxblkid; 13270f6d88adSAlex Reece dprintf_dnode(dn, "start=%llu end=%llu\n", start_blkid, end_blkid); 13280f6d88adSAlex Reece 13290f6d88adSAlex Reece db_search.db_level = 0; 13300f6d88adSAlex Reece db_search.db_blkid = start_blkid; 133186bb58aeSAlex Reece db_search.db_state = DB_SEARCH; 13322f3d8780SMatthew Ahrens 1333713d6c20SMatthew Ahrens mutex_enter(&dn->dn_dbufs_mtx); 13340f6d88adSAlex Reece db = avl_find(&dn->dn_dbufs, &db_search, &where); 13350f6d88adSAlex Reece ASSERT3P(db, ==, NULL); 13362f3d8780SMatthew Ahrens 13370f6d88adSAlex Reece db = avl_nearest(&dn->dn_dbufs, where, AVL_AFTER); 13380f6d88adSAlex Reece 13390f6d88adSAlex Reece for (; db != NULL; db = db_next) { 13400f6d88adSAlex Reece db_next = AVL_NEXT(&dn->dn_dbufs, db); 13410a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 1342cdb0ab79Smaybee 13430f6d88adSAlex Reece if (db->db_level != 0 || db->db_blkid > end_blkid) { 13440f6d88adSAlex Reece break; 13450f6d88adSAlex Reece } 13460f6d88adSAlex Reece ASSERT3U(db->db_blkid, >=, start_blkid); 1347fa9e4066Sahrens 1348fa9e4066Sahrens /* found a level 0 buffer in the range */ 1349fa9e4066Sahrens mutex_enter(&db->db_mtx); 13503b2aab18SMatthew Ahrens if (dbuf_undirty(db, tx)) { 13513b2aab18SMatthew Ahrens /* mutex has been dropped and dbuf destroyed */ 13523b2aab18SMatthew Ahrens continue; 13533b2aab18SMatthew Ahrens } 13543b2aab18SMatthew Ahrens 1355ea8dc4b6Seschrock if (db->db_state == DB_UNCACHED || 135682c9918fSTim Haley db->db_state == DB_NOFILL || 1357ea8dc4b6Seschrock db->db_state == DB_EVICTING) { 1358fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 1359fa9e4066Sahrens mutex_exit(&db->db_mtx); 1360fa9e4066Sahrens continue; 1361fa9e4066Sahrens } 1362c543ec06Sahrens if (db->db_state == DB_READ || db->db_state == DB_FILL) { 1363c543ec06Sahrens /* will be handled in dbuf_read_done or dbuf_rele */ 1364c717a561Smaybee db->db_freed_in_flight = TRUE; 1365fa9e4066Sahrens mutex_exit(&db->db_mtx); 1366fa9e4066Sahrens continue; 1367fa9e4066Sahrens } 1368e914ace2STim Schumacher if (zfs_refcount_count(&db->db_holds) == 0) { 1369ea8dc4b6Seschrock ASSERT(db->db_buf); 1370dcbf3bd6SGeorge Wilson dbuf_destroy(db); 1371ea8dc4b6Seschrock continue; 1372ea8dc4b6Seschrock } 1373c717a561Smaybee /* The dbuf is referenced */ 1374fa9e4066Sahrens 1375c717a561Smaybee if (db->db_last_dirty != NULL) { 1376c717a561Smaybee dbuf_dirty_record_t *dr = db->db_last_dirty; 1377c717a561Smaybee 1378c717a561Smaybee if (dr->dr_txg == txg) { 1379ea8dc4b6Seschrock /* 1380c717a561Smaybee * This buffer is "in-use", re-adjust the file 1381c717a561Smaybee * size to reflect that this buffer may 1382c717a561Smaybee * contain new data when we sync. 1383ea8dc4b6Seschrock */ 138406e0070dSMark Shellenbaum if (db->db_blkid != DMU_SPILL_BLKID && 138506e0070dSMark Shellenbaum db->db_blkid > dn->dn_maxblkid) 138644eda4d7Smaybee dn->dn_maxblkid = db->db_blkid; 1387c717a561Smaybee dbuf_unoverride(dr); 1388c717a561Smaybee } else { 1389c717a561Smaybee /* 1390c717a561Smaybee * This dbuf is not dirty in the open context. 1391c717a561Smaybee * Either uncache it (if its not referenced in 1392c717a561Smaybee * the open context) or reset its contents to 1393c717a561Smaybee * empty. 1394c717a561Smaybee */ 1395c717a561Smaybee dbuf_fix_old_data(db, txg); 139644eda4d7Smaybee } 1397c717a561Smaybee } 1398c717a561Smaybee /* clear the contents if its cached */ 1399ea8dc4b6Seschrock if (db->db_state == DB_CACHED) { 1400ea8dc4b6Seschrock ASSERT(db->db.db_data != NULL); 1401fa9e4066Sahrens arc_release(db->db_buf, db); 1402fa9e4066Sahrens bzero(db->db.db_data, db->db.db_size); 14036b4acc8bSahrens arc_buf_freeze(db->db_buf); 1404fa9e4066Sahrens } 1405ea8dc4b6Seschrock 1406fa9e4066Sahrens mutex_exit(&db->db_mtx); 1407fa9e4066Sahrens } 1408fa9e4066Sahrens mutex_exit(&dn->dn_dbufs_mtx); 1409fa9e4066Sahrens } 1410fa9e4066Sahrens 1411fa9e4066Sahrens void 1412fa9e4066Sahrens dbuf_new_size(dmu_buf_impl_t *db, int size, dmu_tx_t *tx) 1413fa9e4066Sahrens { 1414fa9e4066Sahrens arc_buf_t *buf, *obuf; 1415fa9e4066Sahrens int osize = db->db.db_size; 1416ad23a2dbSjohansen arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 1417744947dcSTom Erickson dnode_t *dn; 1418fa9e4066Sahrens 14190a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 1420ea8dc4b6Seschrock 1421744947dcSTom Erickson DB_DNODE_ENTER(db); 1422744947dcSTom Erickson dn = DB_DNODE(db); 1423744947dcSTom Erickson 1424fa9e4066Sahrens /* XXX does *this* func really need the lock? */ 1425744947dcSTom Erickson ASSERT(RW_WRITE_HELD(&dn->dn_struct_rwlock)); 1426fa9e4066Sahrens 1427fa9e4066Sahrens /* 142843466aaeSMax Grossman * This call to dmu_buf_will_dirty() with the dn_struct_rwlock held 1429fa9e4066Sahrens * is OK, because there can be no other references to the db 1430fa9e4066Sahrens * when we are changing its size, so no concurrent DB_FILL can 1431fa9e4066Sahrens * be happening. 1432fa9e4066Sahrens */ 1433ea8dc4b6Seschrock /* 1434ea8dc4b6Seschrock * XXX we should be doing a dbuf_read, checking the return 1435ea8dc4b6Seschrock * value and returning that up to our callers 1436ea8dc4b6Seschrock */ 143743466aaeSMax Grossman dmu_buf_will_dirty(&db->db, tx); 1438fa9e4066Sahrens 1439fa9e4066Sahrens /* create the data buffer for the new block */ 14405602294fSDan Kimmel buf = arc_alloc_buf(dn->dn_objset->os_spa, db, type, size); 1441fa9e4066Sahrens 1442fa9e4066Sahrens /* copy old block data to the new block */ 1443fa9e4066Sahrens obuf = db->db_buf; 1444f65e61c0Sahrens bcopy(obuf->b_data, buf->b_data, MIN(osize, size)); 1445fa9e4066Sahrens /* zero the remainder */ 1446f65e61c0Sahrens if (size > osize) 1447fa9e4066Sahrens bzero((uint8_t *)buf->b_data + osize, size - osize); 1448fa9e4066Sahrens 1449fa9e4066Sahrens mutex_enter(&db->db_mtx); 1450fa9e4066Sahrens dbuf_set_data(db, buf); 1451dcbf3bd6SGeorge Wilson arc_buf_destroy(obuf, db); 1452fa9e4066Sahrens db->db.db_size = size; 1453fa9e4066Sahrens 1454c717a561Smaybee if (db->db_level == 0) { 1455c717a561Smaybee ASSERT3U(db->db_last_dirty->dr_txg, ==, tx->tx_txg); 1456c717a561Smaybee db->db_last_dirty->dt.dl.dr_data = buf; 1457c717a561Smaybee } 1458fa9e4066Sahrens mutex_exit(&db->db_mtx); 1459fa9e4066Sahrens 146061e255ceSMatthew Ahrens dmu_objset_willuse_space(dn->dn_objset, size - osize, tx); 1461744947dcSTom Erickson DB_DNODE_EXIT(db); 1462fa9e4066Sahrens } 1463fa9e4066Sahrens 14643f9d6ad7SLin Ling void 14653f9d6ad7SLin Ling dbuf_release_bp(dmu_buf_impl_t *db) 14663f9d6ad7SLin Ling { 146743466aaeSMax Grossman objset_t *os = db->db_objset; 14683f9d6ad7SLin Ling 14693f9d6ad7SLin Ling ASSERT(dsl_pool_sync_context(dmu_objset_pool(os))); 14703f9d6ad7SLin Ling ASSERT(arc_released(os->os_phys_buf) || 14713f9d6ad7SLin Ling list_link_active(&os->os_dsl_dataset->ds_synced_link)); 14723f9d6ad7SLin Ling ASSERT(db->db_parent == NULL || arc_released(db->db_parent->db_buf)); 14733f9d6ad7SLin Ling 14741b912ec7SGeorge Wilson (void) arc_release(db->db_buf, db); 14753f9d6ad7SLin Ling } 14763f9d6ad7SLin Ling 14770f2e7d03SMatthew Ahrens /* 14780f2e7d03SMatthew Ahrens * We already have a dirty record for this TXG, and we are being 14790f2e7d03SMatthew Ahrens * dirtied again. 14800f2e7d03SMatthew Ahrens */ 14810f2e7d03SMatthew Ahrens static void 14820f2e7d03SMatthew Ahrens dbuf_redirty(dbuf_dirty_record_t *dr) 14830f2e7d03SMatthew Ahrens { 14840f2e7d03SMatthew Ahrens dmu_buf_impl_t *db = dr->dr_dbuf; 14850f2e7d03SMatthew Ahrens 14860f2e7d03SMatthew Ahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 14870f2e7d03SMatthew Ahrens 14880f2e7d03SMatthew Ahrens if (db->db_level == 0 && db->db_blkid != DMU_BONUS_BLKID) { 14890f2e7d03SMatthew Ahrens /* 14900f2e7d03SMatthew Ahrens * If this buffer has already been written out, 14910f2e7d03SMatthew Ahrens * we now need to reset its state. 14920f2e7d03SMatthew Ahrens */ 14930f2e7d03SMatthew Ahrens dbuf_unoverride(dr); 14940f2e7d03SMatthew Ahrens if (db->db.db_object != DMU_META_DNODE_OBJECT && 14950f2e7d03SMatthew Ahrens db->db_state != DB_NOFILL) { 14960f2e7d03SMatthew Ahrens /* Already released on initial dirty, so just thaw. */ 14970f2e7d03SMatthew Ahrens ASSERT(arc_released(db->db_buf)); 14980f2e7d03SMatthew Ahrens arc_buf_thaw(db->db_buf); 14990f2e7d03SMatthew Ahrens } 15000f2e7d03SMatthew Ahrens } 15010f2e7d03SMatthew Ahrens } 15020f2e7d03SMatthew Ahrens 1503c717a561Smaybee dbuf_dirty_record_t * 1504fa9e4066Sahrens dbuf_dirty(dmu_buf_impl_t *db, dmu_tx_t *tx) 1505fa9e4066Sahrens { 1506744947dcSTom Erickson dnode_t *dn; 1507744947dcSTom Erickson objset_t *os; 1508c717a561Smaybee dbuf_dirty_record_t **drp, *dr; 1509fa9e4066Sahrens int drop_struct_lock = FALSE; 1510fa9e4066Sahrens int txgoff = tx->tx_txg & TXG_MASK; 1511fa9e4066Sahrens 1512fa9e4066Sahrens ASSERT(tx->tx_txg != 0); 1513e914ace2STim Schumacher ASSERT(!zfs_refcount_is_zero(&db->db_holds)); 15149c9dc39aSek110237 DMU_TX_DIRTY_BUF(tx, db); 1515fa9e4066Sahrens 1516744947dcSTom Erickson DB_DNODE_ENTER(db); 1517744947dcSTom Erickson dn = DB_DNODE(db); 1518fa9e4066Sahrens /* 1519fa9e4066Sahrens * Shouldn't dirty a regular buffer in syncing context. Private 1520fa9e4066Sahrens * objects may be dirtied in syncing context, but only if they 1521fa9e4066Sahrens * were already pre-dirtied in open context. 1522fa9e4066Sahrens */ 1523c166b69dSPaul Dagnelie #ifdef DEBUG 1524c166b69dSPaul Dagnelie if (dn->dn_objset->os_dsl_dataset != NULL) { 1525c166b69dSPaul Dagnelie rrw_enter(&dn->dn_objset->os_dsl_dataset->ds_bp_rwlock, 1526c166b69dSPaul Dagnelie RW_READER, FTAG); 1527c166b69dSPaul Dagnelie } 1528c717a561Smaybee ASSERT(!dmu_tx_is_syncing(tx) || 1529c717a561Smaybee BP_IS_HOLE(dn->dn_objset->os_rootbp) || 153014843421SMatthew Ahrens DMU_OBJECT_IS_SPECIAL(dn->dn_object) || 153114843421SMatthew Ahrens dn->dn_objset->os_dsl_dataset == NULL); 1532c166b69dSPaul Dagnelie if (dn->dn_objset->os_dsl_dataset != NULL) 1533c166b69dSPaul Dagnelie rrw_exit(&dn->dn_objset->os_dsl_dataset->ds_bp_rwlock, FTAG); 1534c166b69dSPaul Dagnelie #endif 1535fa9e4066Sahrens /* 1536fa9e4066Sahrens * We make this assert for private objects as well, but after we 1537fa9e4066Sahrens * check if we're already dirty. They are allowed to re-dirty 1538fa9e4066Sahrens * in syncing context. 1539fa9e4066Sahrens */ 1540ea8dc4b6Seschrock ASSERT(dn->dn_object == DMU_META_DNODE_OBJECT || 1541c717a561Smaybee dn->dn_dirtyctx == DN_UNDIRTIED || dn->dn_dirtyctx == 1542fa9e4066Sahrens (dmu_tx_is_syncing(tx) ? DN_DIRTY_SYNC : DN_DIRTY_OPEN)); 1543fa9e4066Sahrens 1544fa9e4066Sahrens mutex_enter(&db->db_mtx); 1545fa9e4066Sahrens /* 1546c717a561Smaybee * XXX make this true for indirects too? The problem is that 1547c717a561Smaybee * transactions created with dmu_tx_create_assigned() from 1548c717a561Smaybee * syncing context don't bother holding ahead. 1549fa9e4066Sahrens */ 1550c717a561Smaybee ASSERT(db->db_level != 0 || 155182c9918fSTim Haley db->db_state == DB_CACHED || db->db_state == DB_FILL || 155282c9918fSTim Haley db->db_state == DB_NOFILL); 1553fa9e4066Sahrens 1554fa9e4066Sahrens mutex_enter(&dn->dn_mtx); 1555fa9e4066Sahrens /* 1556fa9e4066Sahrens * Don't set dirtyctx to SYNC if we're just modifying this as we 1557fa9e4066Sahrens * initialize the objset. 1558fa9e4066Sahrens */ 1559c166b69dSPaul Dagnelie if (dn->dn_dirtyctx == DN_UNDIRTIED) { 1560c166b69dSPaul Dagnelie if (dn->dn_objset->os_dsl_dataset != NULL) { 1561c166b69dSPaul Dagnelie rrw_enter(&dn->dn_objset->os_dsl_dataset->ds_bp_rwlock, 1562c166b69dSPaul Dagnelie RW_READER, FTAG); 1563c166b69dSPaul Dagnelie } 1564c166b69dSPaul Dagnelie if (!BP_IS_HOLE(dn->dn_objset->os_rootbp)) { 1565c166b69dSPaul Dagnelie dn->dn_dirtyctx = (dmu_tx_is_syncing(tx) ? 1566c166b69dSPaul Dagnelie DN_DIRTY_SYNC : DN_DIRTY_OPEN); 1567fa9e4066Sahrens ASSERT(dn->dn_dirtyctx_firstset == NULL); 1568fa9e4066Sahrens dn->dn_dirtyctx_firstset = kmem_alloc(1, KM_SLEEP); 1569fa9e4066Sahrens } 1570c166b69dSPaul Dagnelie if (dn->dn_objset->os_dsl_dataset != NULL) { 1571c166b69dSPaul Dagnelie rrw_exit(&dn->dn_objset->os_dsl_dataset->ds_bp_rwlock, 1572c166b69dSPaul Dagnelie FTAG); 1573c166b69dSPaul Dagnelie } 1574c166b69dSPaul Dagnelie } 1575fa9e4066Sahrens mutex_exit(&dn->dn_mtx); 1576fa9e4066Sahrens 15770a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) 15780a586ceaSMark Shellenbaum dn->dn_have_spill = B_TRUE; 15790a586ceaSMark Shellenbaum 1580fa9e4066Sahrens /* 1581fa9e4066Sahrens * If this buffer is already dirty, we're done. 1582fa9e4066Sahrens */ 1583c717a561Smaybee drp = &db->db_last_dirty; 1584c717a561Smaybee ASSERT(*drp == NULL || (*drp)->dr_txg <= tx->tx_txg || 1585c717a561Smaybee db->db.db_object == DMU_META_DNODE_OBJECT); 15867e2186e3Sbonwick while ((dr = *drp) != NULL && dr->dr_txg > tx->tx_txg) 15877e2186e3Sbonwick drp = &dr->dr_next; 15887e2186e3Sbonwick if (dr && dr->dr_txg == tx->tx_txg) { 1589744947dcSTom Erickson DB_DNODE_EXIT(db); 1590744947dcSTom Erickson 15910f2e7d03SMatthew Ahrens dbuf_redirty(dr); 1592fa9e4066Sahrens mutex_exit(&db->db_mtx); 15937e2186e3Sbonwick return (dr); 1594fa9e4066Sahrens } 1595fa9e4066Sahrens 1596fa9e4066Sahrens /* 1597fa9e4066Sahrens * Only valid if not already dirty. 1598fa9e4066Sahrens */ 159914843421SMatthew Ahrens ASSERT(dn->dn_object == 0 || 160014843421SMatthew Ahrens dn->dn_dirtyctx == DN_UNDIRTIED || dn->dn_dirtyctx == 1601fa9e4066Sahrens (dmu_tx_is_syncing(tx) ? DN_DIRTY_SYNC : DN_DIRTY_OPEN)); 1602fa9e4066Sahrens 1603fa9e4066Sahrens ASSERT3U(dn->dn_nlevels, >, db->db_level); 1604fa9e4066Sahrens 1605fa9e4066Sahrens /* 1606fa9e4066Sahrens * We should only be dirtying in syncing context if it's the 160714843421SMatthew Ahrens * mos or we're initializing the os or it's a special object. 160814843421SMatthew Ahrens * However, we are allowed to dirty in syncing context provided 160914843421SMatthew Ahrens * we already dirtied it in open context. Hence we must make 161014843421SMatthew Ahrens * this assertion only if we're not already dirty. 1611fa9e4066Sahrens */ 1612744947dcSTom Erickson os = dn->dn_objset; 16133991b535SGeorge Wilson VERIFY3U(tx->tx_txg, <=, spa_final_dirty_txg(os->os_spa)); 1614c166b69dSPaul Dagnelie #ifdef DEBUG 1615c166b69dSPaul Dagnelie if (dn->dn_objset->os_dsl_dataset != NULL) 1616c166b69dSPaul Dagnelie rrw_enter(&os->os_dsl_dataset->ds_bp_rwlock, RW_READER, FTAG); 161714843421SMatthew Ahrens ASSERT(!dmu_tx_is_syncing(tx) || DMU_OBJECT_IS_SPECIAL(dn->dn_object) || 161814843421SMatthew Ahrens os->os_dsl_dataset == NULL || BP_IS_HOLE(os->os_rootbp)); 1619c166b69dSPaul Dagnelie if (dn->dn_objset->os_dsl_dataset != NULL) 1620c166b69dSPaul Dagnelie rrw_exit(&os->os_dsl_dataset->ds_bp_rwlock, FTAG); 1621c166b69dSPaul Dagnelie #endif 1622fa9e4066Sahrens ASSERT(db->db.db_size != 0); 1623fa9e4066Sahrens 1624fa9e4066Sahrens dprintf_dbuf(db, "size=%llx\n", (u_longlong_t)db->db.db_size); 1625fa9e4066Sahrens 16260a586ceaSMark Shellenbaum if (db->db_blkid != DMU_BONUS_BLKID) { 162761e255ceSMatthew Ahrens dmu_objset_willuse_space(os, db->db.db_size, tx); 16281934e92fSmaybee } 16291934e92fSmaybee 1630ea8dc4b6Seschrock /* 1631ea8dc4b6Seschrock * If this buffer is dirty in an old transaction group we need 1632ea8dc4b6Seschrock * to make a copy of it so that the changes we make in this 1633ea8dc4b6Seschrock * transaction group won't leak out when we sync the older txg. 1634ea8dc4b6Seschrock */ 1635c717a561Smaybee dr = kmem_zalloc(sizeof (dbuf_dirty_record_t), KM_SLEEP); 1636c717a561Smaybee if (db->db_level == 0) { 1637c717a561Smaybee void *data_old = db->db_buf; 1638c717a561Smaybee 163982c9918fSTim Haley if (db->db_state != DB_NOFILL) { 16400a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 1641c717a561Smaybee dbuf_fix_old_data(db, tx->tx_txg); 1642c717a561Smaybee data_old = db->db.db_data; 1643c717a561Smaybee } else if (db->db.db_object != DMU_META_DNODE_OBJECT) { 1644fa9e4066Sahrens /* 164582c9918fSTim Haley * Release the data buffer from the cache so 164682c9918fSTim Haley * that we can modify it without impacting 164782c9918fSTim Haley * possible other users of this cached data 164882c9918fSTim Haley * block. Note that indirect blocks and 164982c9918fSTim Haley * private objects are not released until the 165082c9918fSTim Haley * syncing state (since they are only modified 165182c9918fSTim Haley * then). 1652fa9e4066Sahrens */ 1653fa9e4066Sahrens arc_release(db->db_buf, db); 1654fa9e4066Sahrens dbuf_fix_old_data(db, tx->tx_txg); 1655c717a561Smaybee data_old = db->db_buf; 1656fa9e4066Sahrens } 1657c717a561Smaybee ASSERT(data_old != NULL); 165882c9918fSTim Haley } 1659c717a561Smaybee dr->dt.dl.dr_data = data_old; 1660c717a561Smaybee } else { 1661c717a561Smaybee mutex_init(&dr->dt.di.dr_mtx, NULL, MUTEX_DEFAULT, NULL); 1662c717a561Smaybee list_create(&dr->dt.di.dr_children, 1663c717a561Smaybee sizeof (dbuf_dirty_record_t), 1664c717a561Smaybee offsetof(dbuf_dirty_record_t, dr_dirty_node)); 1665fa9e4066Sahrens } 166669962b56SMatthew Ahrens if (db->db_blkid != DMU_BONUS_BLKID && os->os_dsl_dataset != NULL) 166769962b56SMatthew Ahrens dr->dr_accounted = db->db.db_size; 1668c717a561Smaybee dr->dr_dbuf = db; 1669c717a561Smaybee dr->dr_txg = tx->tx_txg; 1670c717a561Smaybee dr->dr_next = *drp; 1671c717a561Smaybee *drp = dr; 1672fa9e4066Sahrens 1673fa9e4066Sahrens /* 1674fa9e4066Sahrens * We could have been freed_in_flight between the dbuf_noread 1675fa9e4066Sahrens * and dbuf_dirty. We win, as though the dbuf_noread() had 1676fa9e4066Sahrens * happened after the free. 1677fa9e4066Sahrens */ 16780a586ceaSMark Shellenbaum if (db->db_level == 0 && db->db_blkid != DMU_BONUS_BLKID && 16790a586ceaSMark Shellenbaum db->db_blkid != DMU_SPILL_BLKID) { 1680c717a561Smaybee mutex_enter(&dn->dn_mtx); 1681bf16b11eSMatthew Ahrens if (dn->dn_free_ranges[txgoff] != NULL) { 1682bf16b11eSMatthew Ahrens range_tree_clear(dn->dn_free_ranges[txgoff], 1683bf16b11eSMatthew Ahrens db->db_blkid, 1); 1684bf16b11eSMatthew Ahrens } 1685fa9e4066Sahrens mutex_exit(&dn->dn_mtx); 1686c717a561Smaybee db->db_freed_in_flight = FALSE; 1687c717a561Smaybee } 1688fa9e4066Sahrens 1689fa9e4066Sahrens /* 1690fa9e4066Sahrens * This buffer is now part of this txg 1691fa9e4066Sahrens */ 1692fa9e4066Sahrens dbuf_add_ref(db, (void *)(uintptr_t)tx->tx_txg); 1693fa9e4066Sahrens db->db_dirtycnt += 1; 1694fa9e4066Sahrens ASSERT3U(db->db_dirtycnt, <=, 3); 1695fa9e4066Sahrens 1696fa9e4066Sahrens mutex_exit(&db->db_mtx); 1697fa9e4066Sahrens 16980a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID || 16990a586ceaSMark Shellenbaum db->db_blkid == DMU_SPILL_BLKID) { 1700c717a561Smaybee mutex_enter(&dn->dn_mtx); 1701c717a561Smaybee ASSERT(!list_link_active(&dr->dr_dirty_node)); 1702c717a561Smaybee list_insert_tail(&dn->dn_dirty_records[txgoff], dr); 1703c717a561Smaybee mutex_exit(&dn->dn_mtx); 1704fa9e4066Sahrens dnode_setdirty(dn, tx); 1705744947dcSTom Erickson DB_DNODE_EXIT(db); 1706c717a561Smaybee return (dr); 170792654925SMatthew Ahrens } 170892654925SMatthew Ahrens 170992654925SMatthew Ahrens /* 171092654925SMatthew Ahrens * The dn_struct_rwlock prevents db_blkptr from changing 171192654925SMatthew Ahrens * due to a write from syncing context completing 171292654925SMatthew Ahrens * while we are running, so we want to acquire it before 171392654925SMatthew Ahrens * looking at db_blkptr. 171492654925SMatthew Ahrens */ 171592654925SMatthew Ahrens if (!RW_WRITE_HELD(&dn->dn_struct_rwlock)) { 171692654925SMatthew Ahrens rw_enter(&dn->dn_struct_rwlock, RW_READER); 171792654925SMatthew Ahrens drop_struct_lock = TRUE; 171892654925SMatthew Ahrens } 171992654925SMatthew Ahrens 1720d3469faaSMark Maybee /* 1721dcb6872cSMatthew Ahrens * We need to hold the dn_struct_rwlock to make this assertion, 1722dcb6872cSMatthew Ahrens * because it protects dn_phys / dn_next_nlevels from changing. 1723dcb6872cSMatthew Ahrens */ 1724dcb6872cSMatthew Ahrens ASSERT((dn->dn_phys->dn_nlevels == 0 && db->db_level == 0) || 1725dcb6872cSMatthew Ahrens dn->dn_phys->dn_nlevels > db->db_level || 1726dcb6872cSMatthew Ahrens dn->dn_next_nlevels[txgoff] > db->db_level || 1727dcb6872cSMatthew Ahrens dn->dn_next_nlevels[(tx->tx_txg-1) & TXG_MASK] > db->db_level || 1728dcb6872cSMatthew Ahrens dn->dn_next_nlevels[(tx->tx_txg-2) & TXG_MASK] > db->db_level); 1729dcb6872cSMatthew Ahrens 1730dcb6872cSMatthew Ahrens /* 173161e255ceSMatthew Ahrens * If we are overwriting a dedup BP, then unless it is snapshotted, 173261e255ceSMatthew Ahrens * when we get to syncing context we will need to decrement its 173361e255ceSMatthew Ahrens * refcount in the DDT. Prefetch the relevant DDT block so that 173461e255ceSMatthew Ahrens * syncing context won't have to wait for the i/o. 1735d3469faaSMark Maybee */ 173661e255ceSMatthew Ahrens ddt_prefetch(os->os_spa, db->db_blkptr); 1737fa9e4066Sahrens 17388346f03fSJonathan W Adams if (db->db_level == 0) { 17398346f03fSJonathan W Adams dnode_new_blkid(dn, db->db_blkid, tx, drop_struct_lock); 17408346f03fSJonathan W Adams ASSERT(dn->dn_maxblkid >= db->db_blkid); 17418346f03fSJonathan W Adams } 17428346f03fSJonathan W Adams 174344eda4d7Smaybee if (db->db_level+1 < dn->dn_nlevels) { 1744c717a561Smaybee dmu_buf_impl_t *parent = db->db_parent; 1745c717a561Smaybee dbuf_dirty_record_t *di; 1746c717a561Smaybee int parent_held = FALSE; 1747c717a561Smaybee 1748c717a561Smaybee if (db->db_parent == NULL || db->db_parent == dn->dn_dbuf) { 1749fa9e4066Sahrens int epbs = dn->dn_indblkshift - SPA_BLKPTRSHIFT; 1750c717a561Smaybee 1751fa9e4066Sahrens parent = dbuf_hold_level(dn, db->db_level+1, 1752fa9e4066Sahrens db->db_blkid >> epbs, FTAG); 175301025c89SJohn Harres ASSERT(parent != NULL); 1754c717a561Smaybee parent_held = TRUE; 1755c717a561Smaybee } 1756fa9e4066Sahrens if (drop_struct_lock) 1757fa9e4066Sahrens rw_exit(&dn->dn_struct_rwlock); 1758c717a561Smaybee ASSERT3U(db->db_level+1, ==, parent->db_level); 1759c717a561Smaybee di = dbuf_dirty(parent, tx); 1760c717a561Smaybee if (parent_held) 1761ea8dc4b6Seschrock dbuf_rele(parent, FTAG); 1762c717a561Smaybee 1763c717a561Smaybee mutex_enter(&db->db_mtx); 176469962b56SMatthew Ahrens /* 176569962b56SMatthew Ahrens * Since we've dropped the mutex, it's possible that 176669962b56SMatthew Ahrens * dbuf_undirty() might have changed this out from under us. 176769962b56SMatthew Ahrens */ 1768c717a561Smaybee if (db->db_last_dirty == dr || 1769c717a561Smaybee dn->dn_object == DMU_META_DNODE_OBJECT) { 1770c717a561Smaybee mutex_enter(&di->dt.di.dr_mtx); 1771c717a561Smaybee ASSERT3U(di->dr_txg, ==, tx->tx_txg); 1772c717a561Smaybee ASSERT(!list_link_active(&dr->dr_dirty_node)); 1773c717a561Smaybee list_insert_tail(&di->dt.di.dr_children, dr); 1774c717a561Smaybee mutex_exit(&di->dt.di.dr_mtx); 1775c717a561Smaybee dr->dr_parent = di; 1776c717a561Smaybee } 1777c717a561Smaybee mutex_exit(&db->db_mtx); 1778fa9e4066Sahrens } else { 1779c717a561Smaybee ASSERT(db->db_level+1 == dn->dn_nlevels); 1780c717a561Smaybee ASSERT(db->db_blkid < dn->dn_nblkptr); 1781744947dcSTom Erickson ASSERT(db->db_parent == NULL || db->db_parent == dn->dn_dbuf); 1782c717a561Smaybee mutex_enter(&dn->dn_mtx); 1783c717a561Smaybee ASSERT(!list_link_active(&dr->dr_dirty_node)); 1784c717a561Smaybee list_insert_tail(&dn->dn_dirty_records[txgoff], dr); 1785c717a561Smaybee mutex_exit(&dn->dn_mtx); 1786fa9e4066Sahrens if (drop_struct_lock) 1787fa9e4066Sahrens rw_exit(&dn->dn_struct_rwlock); 1788fa9e4066Sahrens } 1789fa9e4066Sahrens 1790fa9e4066Sahrens dnode_setdirty(dn, tx); 1791744947dcSTom Erickson DB_DNODE_EXIT(db); 1792c717a561Smaybee return (dr); 1793fa9e4066Sahrens } 1794fa9e4066Sahrens 17953b2aab18SMatthew Ahrens /* 17963e30c24aSWill Andrews * Undirty a buffer in the transaction group referenced by the given 17973e30c24aSWill Andrews * transaction. Return whether this evicted the dbuf. 17983b2aab18SMatthew Ahrens */ 17993b2aab18SMatthew Ahrens static boolean_t 1800fa9e4066Sahrens dbuf_undirty(dmu_buf_impl_t *db, dmu_tx_t *tx) 1801fa9e4066Sahrens { 1802744947dcSTom Erickson dnode_t *dn; 1803c717a561Smaybee uint64_t txg = tx->tx_txg; 180417f17c2dSbonwick dbuf_dirty_record_t *dr, **drp; 1805fa9e4066Sahrens 1806c717a561Smaybee ASSERT(txg != 0); 180746e1baa6SMatthew Ahrens 180846e1baa6SMatthew Ahrens /* 180946e1baa6SMatthew Ahrens * Due to our use of dn_nlevels below, this can only be called 181046e1baa6SMatthew Ahrens * in open context, unless we are operating on the MOS. 181146e1baa6SMatthew Ahrens * From syncing context, dn_nlevels may be different from the 181246e1baa6SMatthew Ahrens * dn_nlevels used when dbuf was dirtied. 181346e1baa6SMatthew Ahrens */ 181446e1baa6SMatthew Ahrens ASSERT(db->db_objset == 181546e1baa6SMatthew Ahrens dmu_objset_pool(db->db_objset)->dp_meta_objset || 181646e1baa6SMatthew Ahrens txg != spa_syncing_txg(dmu_objset_spa(db->db_objset))); 18170a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 18183b2aab18SMatthew Ahrens ASSERT0(db->db_level); 18193b2aab18SMatthew Ahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 1820fa9e4066Sahrens 1821fa9e4066Sahrens /* 1822fa9e4066Sahrens * If this buffer is not dirty, we're done. 1823fa9e4066Sahrens */ 182417f17c2dSbonwick for (drp = &db->db_last_dirty; (dr = *drp) != NULL; drp = &dr->dr_next) 1825c717a561Smaybee if (dr->dr_txg <= txg) 1826c717a561Smaybee break; 18273b2aab18SMatthew Ahrens if (dr == NULL || dr->dr_txg < txg) 18283b2aab18SMatthew Ahrens return (B_FALSE); 1829c717a561Smaybee ASSERT(dr->dr_txg == txg); 1830b24ab676SJeff Bonwick ASSERT(dr->dr_dbuf == db); 1831fa9e4066Sahrens 1832744947dcSTom Erickson DB_DNODE_ENTER(db); 1833744947dcSTom Erickson dn = DB_DNODE(db); 1834744947dcSTom Erickson 1835fa9e4066Sahrens dprintf_dbuf(db, "size=%llx\n", (u_longlong_t)db->db.db_size); 1836fa9e4066Sahrens 1837fa9e4066Sahrens ASSERT(db->db.db_size != 0); 1838fa9e4066Sahrens 183946e1baa6SMatthew Ahrens dsl_pool_undirty_space(dmu_objset_pool(dn->dn_objset), 184046e1baa6SMatthew Ahrens dr->dr_accounted, txg); 1841fa9e4066Sahrens 184217f17c2dSbonwick *drp = dr->dr_next; 1843c717a561Smaybee 18443f2366c2SGordon Ross /* 18453f2366c2SGordon Ross * Note that there are three places in dbuf_dirty() 18463f2366c2SGordon Ross * where this dirty record may be put on a list. 18473f2366c2SGordon Ross * Make sure to do a list_remove corresponding to 18483f2366c2SGordon Ross * every one of those list_insert calls. 18493f2366c2SGordon Ross */ 1850c717a561Smaybee if (dr->dr_parent) { 1851c717a561Smaybee mutex_enter(&dr->dr_parent->dt.di.dr_mtx); 1852c717a561Smaybee list_remove(&dr->dr_parent->dt.di.dr_children, dr); 1853c717a561Smaybee mutex_exit(&dr->dr_parent->dt.di.dr_mtx); 18543f2366c2SGordon Ross } else if (db->db_blkid == DMU_SPILL_BLKID || 18553f2366c2SGordon Ross db->db_level + 1 == dn->dn_nlevels) { 1856cdb0ab79Smaybee ASSERT(db->db_blkptr == NULL || db->db_parent == dn->dn_dbuf); 1857fa9e4066Sahrens mutex_enter(&dn->dn_mtx); 1858c717a561Smaybee list_remove(&dn->dn_dirty_records[txg & TXG_MASK], dr); 1859fa9e4066Sahrens mutex_exit(&dn->dn_mtx); 1860c717a561Smaybee } 1861744947dcSTom Erickson DB_DNODE_EXIT(db); 1862c717a561Smaybee 186382c9918fSTim Haley if (db->db_state != DB_NOFILL) { 1864c717a561Smaybee dbuf_unoverride(dr); 1865c717a561Smaybee 1866c717a561Smaybee ASSERT(db->db_buf != NULL); 1867c717a561Smaybee ASSERT(dr->dt.dl.dr_data != NULL); 1868c717a561Smaybee if (dr->dt.dl.dr_data != db->db_buf) 1869dcbf3bd6SGeorge Wilson arc_buf_destroy(dr->dt.dl.dr_data, db); 1870c717a561Smaybee } 1871d2b3cbbdSJorgen Lundman 1872c717a561Smaybee kmem_free(dr, sizeof (dbuf_dirty_record_t)); 1873fa9e4066Sahrens 1874fa9e4066Sahrens ASSERT(db->db_dirtycnt > 0); 1875fa9e4066Sahrens db->db_dirtycnt -= 1; 1876fa9e4066Sahrens 1877e914ace2STim Schumacher if (zfs_refcount_remove(&db->db_holds, (void *)(uintptr_t)txg) == 0) { 1878dcbf3bd6SGeorge Wilson ASSERT(db->db_state == DB_NOFILL || arc_released(db->db_buf)); 1879dcbf3bd6SGeorge Wilson dbuf_destroy(db); 18803b2aab18SMatthew Ahrens return (B_TRUE); 1881fa9e4066Sahrens } 1882fa9e4066Sahrens 18833b2aab18SMatthew Ahrens return (B_FALSE); 1884fa9e4066Sahrens } 1885fa9e4066Sahrens 1886fa9e4066Sahrens void 188743466aaeSMax Grossman dmu_buf_will_dirty(dmu_buf_t *db_fake, dmu_tx_t *tx) 1888fa9e4066Sahrens { 188943466aaeSMax Grossman dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 18901ab7f2deSmaybee int rf = DB_RF_MUST_SUCCEED | DB_RF_NOPREFETCH; 1891fa9e4066Sahrens 1892fa9e4066Sahrens ASSERT(tx->tx_txg != 0); 1893e914ace2STim Schumacher ASSERT(!zfs_refcount_is_zero(&db->db_holds)); 1894fa9e4066Sahrens 18950f2e7d03SMatthew Ahrens /* 18960f2e7d03SMatthew Ahrens * Quick check for dirtyness. For already dirty blocks, this 18970f2e7d03SMatthew Ahrens * reduces runtime of this function by >90%, and overall performance 18980f2e7d03SMatthew Ahrens * by 50% for some workloads (e.g. file deletion with indirect blocks 18990f2e7d03SMatthew Ahrens * cached). 19000f2e7d03SMatthew Ahrens */ 19010f2e7d03SMatthew Ahrens mutex_enter(&db->db_mtx); 19020f2e7d03SMatthew Ahrens dbuf_dirty_record_t *dr; 19030f2e7d03SMatthew Ahrens for (dr = db->db_last_dirty; 19040f2e7d03SMatthew Ahrens dr != NULL && dr->dr_txg >= tx->tx_txg; dr = dr->dr_next) { 19050f2e7d03SMatthew Ahrens /* 19060f2e7d03SMatthew Ahrens * It's possible that it is already dirty but not cached, 19070f2e7d03SMatthew Ahrens * because there are some calls to dbuf_dirty() that don't 19080f2e7d03SMatthew Ahrens * go through dmu_buf_will_dirty(). 19090f2e7d03SMatthew Ahrens */ 19100f2e7d03SMatthew Ahrens if (dr->dr_txg == tx->tx_txg && db->db_state == DB_CACHED) { 19110f2e7d03SMatthew Ahrens /* This dbuf is already dirty and cached. */ 19120f2e7d03SMatthew Ahrens dbuf_redirty(dr); 19130f2e7d03SMatthew Ahrens mutex_exit(&db->db_mtx); 19140f2e7d03SMatthew Ahrens return; 19150f2e7d03SMatthew Ahrens } 19160f2e7d03SMatthew Ahrens } 19170f2e7d03SMatthew Ahrens mutex_exit(&db->db_mtx); 19180f2e7d03SMatthew Ahrens 1919744947dcSTom Erickson DB_DNODE_ENTER(db); 1920744947dcSTom Erickson if (RW_WRITE_HELD(&DB_DNODE(db)->dn_struct_rwlock)) 1921fa9e4066Sahrens rf |= DB_RF_HAVESTRUCT; 1922744947dcSTom Erickson DB_DNODE_EXIT(db); 1923ea8dc4b6Seschrock (void) dbuf_read(db, NULL, rf); 1924c717a561Smaybee (void) dbuf_dirty(db, tx); 1925fa9e4066Sahrens } 1926fa9e4066Sahrens 1927fa9e4066Sahrens void 192882c9918fSTim Haley dmu_buf_will_not_fill(dmu_buf_t *db_fake, dmu_tx_t *tx) 192982c9918fSTim Haley { 193082c9918fSTim Haley dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 193182c9918fSTim Haley 193282c9918fSTim Haley db->db_state = DB_NOFILL; 193382c9918fSTim Haley 193482c9918fSTim Haley dmu_buf_will_fill(db_fake, tx); 193582c9918fSTim Haley } 193682c9918fSTim Haley 193782c9918fSTim Haley void 1938ea8dc4b6Seschrock dmu_buf_will_fill(dmu_buf_t *db_fake, dmu_tx_t *tx) 1939fa9e4066Sahrens { 1940ea8dc4b6Seschrock dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 1941ea8dc4b6Seschrock 19420a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 1943fa9e4066Sahrens ASSERT(tx->tx_txg != 0); 1944fa9e4066Sahrens ASSERT(db->db_level == 0); 1945e914ace2STim Schumacher ASSERT(!zfs_refcount_is_zero(&db->db_holds)); 1946fa9e4066Sahrens 1947ea8dc4b6Seschrock ASSERT(db->db.db_object != DMU_META_DNODE_OBJECT || 1948fa9e4066Sahrens dmu_tx_private_ok(tx)); 1949fa9e4066Sahrens 1950fa9e4066Sahrens dbuf_noread(db); 1951c717a561Smaybee (void) dbuf_dirty(db, tx); 1952fa9e4066Sahrens } 1953fa9e4066Sahrens 1954fa9e4066Sahrens #pragma weak dmu_buf_fill_done = dbuf_fill_done 1955fa9e4066Sahrens /* ARGSUSED */ 1956fa9e4066Sahrens void 1957fa9e4066Sahrens dbuf_fill_done(dmu_buf_impl_t *db, dmu_tx_t *tx) 1958fa9e4066Sahrens { 1959fa9e4066Sahrens mutex_enter(&db->db_mtx); 19609c9dc39aSek110237 DBUF_VERIFY(db); 1961fa9e4066Sahrens 1962fa9e4066Sahrens if (db->db_state == DB_FILL) { 1963c717a561Smaybee if (db->db_level == 0 && db->db_freed_in_flight) { 19640a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 1965fa9e4066Sahrens /* we were freed while filling */ 1966fa9e4066Sahrens /* XXX dbuf_undirty? */ 1967fa9e4066Sahrens bzero(db->db.db_data, db->db.db_size); 1968c717a561Smaybee db->db_freed_in_flight = FALSE; 1969fa9e4066Sahrens } 1970fa9e4066Sahrens db->db_state = DB_CACHED; 1971fa9e4066Sahrens cv_broadcast(&db->db_changed); 1972fa9e4066Sahrens } 1973fa9e4066Sahrens mutex_exit(&db->db_mtx); 1974fa9e4066Sahrens } 1975fa9e4066Sahrens 19765d7b4d43SMatthew Ahrens void 19775d7b4d43SMatthew Ahrens dmu_buf_write_embedded(dmu_buf_t *dbuf, void *data, 19785d7b4d43SMatthew Ahrens bp_embedded_type_t etype, enum zio_compress comp, 19795d7b4d43SMatthew Ahrens int uncompressed_size, int compressed_size, int byteorder, 19805d7b4d43SMatthew Ahrens dmu_tx_t *tx) 19815d7b4d43SMatthew Ahrens { 19825d7b4d43SMatthew Ahrens dmu_buf_impl_t *db = (dmu_buf_impl_t *)dbuf; 19835d7b4d43SMatthew Ahrens struct dirty_leaf *dl; 19845d7b4d43SMatthew Ahrens dmu_object_type_t type; 19855d7b4d43SMatthew Ahrens 1986ca0cc391SMatthew Ahrens if (etype == BP_EMBEDDED_TYPE_DATA) { 1987ca0cc391SMatthew Ahrens ASSERT(spa_feature_is_active(dmu_objset_spa(db->db_objset), 1988ca0cc391SMatthew Ahrens SPA_FEATURE_EMBEDDED_DATA)); 1989ca0cc391SMatthew Ahrens } 1990ca0cc391SMatthew Ahrens 19915d7b4d43SMatthew Ahrens DB_DNODE_ENTER(db); 19925d7b4d43SMatthew Ahrens type = DB_DNODE(db)->dn_type; 19935d7b4d43SMatthew Ahrens DB_DNODE_EXIT(db); 19945d7b4d43SMatthew Ahrens 19955d7b4d43SMatthew Ahrens ASSERT0(db->db_level); 19965d7b4d43SMatthew Ahrens ASSERT(db->db_blkid != DMU_BONUS_BLKID); 19975d7b4d43SMatthew Ahrens 19985d7b4d43SMatthew Ahrens dmu_buf_will_not_fill(dbuf, tx); 19995d7b4d43SMatthew Ahrens 20005d7b4d43SMatthew Ahrens ASSERT3U(db->db_last_dirty->dr_txg, ==, tx->tx_txg); 20015d7b4d43SMatthew Ahrens dl = &db->db_last_dirty->dt.dl; 20025d7b4d43SMatthew Ahrens encode_embedded_bp_compressed(&dl->dr_overridden_by, 20035d7b4d43SMatthew Ahrens data, comp, uncompressed_size, compressed_size); 20045d7b4d43SMatthew Ahrens BPE_SET_ETYPE(&dl->dr_overridden_by, etype); 20055d7b4d43SMatthew Ahrens BP_SET_TYPE(&dl->dr_overridden_by, type); 20065d7b4d43SMatthew Ahrens BP_SET_LEVEL(&dl->dr_overridden_by, 0); 20075d7b4d43SMatthew Ahrens BP_SET_BYTEORDER(&dl->dr_overridden_by, byteorder); 20085d7b4d43SMatthew Ahrens 20095d7b4d43SMatthew Ahrens dl->dr_override_state = DR_OVERRIDDEN; 20105d7b4d43SMatthew Ahrens dl->dr_overridden_by.blk_birth = db->db_last_dirty->dr_txg; 20115d7b4d43SMatthew Ahrens } 20125d7b4d43SMatthew Ahrens 2013ea8dc4b6Seschrock /* 20142fdbea25SAleksandr Guzovskiy * Directly assign a provided arc buf to a given dbuf if it's not referenced 20152fdbea25SAleksandr Guzovskiy * by anybody except our caller. Otherwise copy arcbuf's contents to dbuf. 20162fdbea25SAleksandr Guzovskiy */ 20172fdbea25SAleksandr Guzovskiy void 20182fdbea25SAleksandr Guzovskiy dbuf_assign_arcbuf(dmu_buf_impl_t *db, arc_buf_t *buf, dmu_tx_t *tx) 20192fdbea25SAleksandr Guzovskiy { 2020e914ace2STim Schumacher ASSERT(!zfs_refcount_is_zero(&db->db_holds)); 20210a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 20222fdbea25SAleksandr Guzovskiy ASSERT(db->db_level == 0); 20235602294fSDan Kimmel ASSERT3U(dbuf_is_metadata(db), ==, arc_is_metadata(buf)); 20242fdbea25SAleksandr Guzovskiy ASSERT(buf != NULL); 20255602294fSDan Kimmel ASSERT(arc_buf_lsize(buf) == db->db.db_size); 20262fdbea25SAleksandr Guzovskiy ASSERT(tx->tx_txg != 0); 20272fdbea25SAleksandr Guzovskiy 20282fdbea25SAleksandr Guzovskiy arc_return_buf(buf, db); 20292fdbea25SAleksandr Guzovskiy ASSERT(arc_released(buf)); 20302fdbea25SAleksandr Guzovskiy 20312fdbea25SAleksandr Guzovskiy mutex_enter(&db->db_mtx); 20322fdbea25SAleksandr Guzovskiy 20332fdbea25SAleksandr Guzovskiy while (db->db_state == DB_READ || db->db_state == DB_FILL) 20342fdbea25SAleksandr Guzovskiy cv_wait(&db->db_changed, &db->db_mtx); 20352fdbea25SAleksandr Guzovskiy 20362fdbea25SAleksandr Guzovskiy ASSERT(db->db_state == DB_CACHED || db->db_state == DB_UNCACHED); 20372fdbea25SAleksandr Guzovskiy 20382fdbea25SAleksandr Guzovskiy if (db->db_state == DB_CACHED && 2039e914ace2STim Schumacher zfs_refcount_count(&db->db_holds) - 1 > db->db_dirtycnt) { 20402fdbea25SAleksandr Guzovskiy mutex_exit(&db->db_mtx); 20412fdbea25SAleksandr Guzovskiy (void) dbuf_dirty(db, tx); 20422fdbea25SAleksandr Guzovskiy bcopy(buf->b_data, db->db.db_data, db->db.db_size); 2043dcbf3bd6SGeorge Wilson arc_buf_destroy(buf, db); 2044c242f9a0Schunli zhang - Sun Microsystems - Irvine United States xuio_stat_wbuf_copied(); 20452fdbea25SAleksandr Guzovskiy return; 20462fdbea25SAleksandr Guzovskiy } 20472fdbea25SAleksandr Guzovskiy 2048c242f9a0Schunli zhang - Sun Microsystems - Irvine United States xuio_stat_wbuf_nocopy(); 20492fdbea25SAleksandr Guzovskiy if (db->db_state == DB_CACHED) { 20502fdbea25SAleksandr Guzovskiy dbuf_dirty_record_t *dr = db->db_last_dirty; 20512fdbea25SAleksandr Guzovskiy 20522fdbea25SAleksandr Guzovskiy ASSERT(db->db_buf != NULL); 20532fdbea25SAleksandr Guzovskiy if (dr != NULL && dr->dr_txg == tx->tx_txg) { 20542fdbea25SAleksandr Guzovskiy ASSERT(dr->dt.dl.dr_data == db->db_buf); 20552fdbea25SAleksandr Guzovskiy if (!arc_released(db->db_buf)) { 20562fdbea25SAleksandr Guzovskiy ASSERT(dr->dt.dl.dr_override_state == 20572fdbea25SAleksandr Guzovskiy DR_OVERRIDDEN); 20582fdbea25SAleksandr Guzovskiy arc_release(db->db_buf, db); 20592fdbea25SAleksandr Guzovskiy } 20602fdbea25SAleksandr Guzovskiy dr->dt.dl.dr_data = buf; 2061dcbf3bd6SGeorge Wilson arc_buf_destroy(db->db_buf, db); 20622fdbea25SAleksandr Guzovskiy } else if (dr == NULL || dr->dt.dl.dr_data != db->db_buf) { 20632fdbea25SAleksandr Guzovskiy arc_release(db->db_buf, db); 2064dcbf3bd6SGeorge Wilson arc_buf_destroy(db->db_buf, db); 20652fdbea25SAleksandr Guzovskiy } 20662fdbea25SAleksandr Guzovskiy db->db_buf = NULL; 20672fdbea25SAleksandr Guzovskiy } 20682fdbea25SAleksandr Guzovskiy ASSERT(db->db_buf == NULL); 20692fdbea25SAleksandr Guzovskiy dbuf_set_data(db, buf); 20702fdbea25SAleksandr Guzovskiy db->db_state = DB_FILL; 20712fdbea25SAleksandr Guzovskiy mutex_exit(&db->db_mtx); 20722fdbea25SAleksandr Guzovskiy (void) dbuf_dirty(db, tx); 207343466aaeSMax Grossman dmu_buf_fill_done(&db->db, tx); 20742fdbea25SAleksandr Guzovskiy } 20752fdbea25SAleksandr Guzovskiy 2076ea8dc4b6Seschrock void 2077dcbf3bd6SGeorge Wilson dbuf_destroy(dmu_buf_impl_t *db) 2078fa9e4066Sahrens { 2079744947dcSTom Erickson dnode_t *dn; 2080ea8dc4b6Seschrock dmu_buf_impl_t *parent = db->db_parent; 2081744947dcSTom Erickson dmu_buf_impl_t *dndb; 2082fa9e4066Sahrens 2083fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 2084e914ace2STim Schumacher ASSERT(zfs_refcount_is_zero(&db->db_holds)); 2085fa9e4066Sahrens 2086dcbf3bd6SGeorge Wilson if (db->db_buf != NULL) { 2087dcbf3bd6SGeorge Wilson arc_buf_destroy(db->db_buf, db); 2088dcbf3bd6SGeorge Wilson db->db_buf = NULL; 2089dcbf3bd6SGeorge Wilson } 2090ea8dc4b6Seschrock 20910a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 209254811da5SToomas Soome int slots = DB_DNODE(db)->dn_num_slots; 209354811da5SToomas Soome int bonuslen = DN_SLOTS_TO_BONUSLEN(slots); 209454811da5SToomas Soome if (db->db.db_data != NULL) { 209554811da5SToomas Soome zio_buf_free(db->db.db_data, bonuslen); 209654811da5SToomas Soome arc_space_return(bonuslen, ARC_SPACE_BONUS); 2097fa9e4066Sahrens db->db_state = DB_UNCACHED; 2098fa9e4066Sahrens } 209954811da5SToomas Soome } 2100fa9e4066Sahrens 2101dcbf3bd6SGeorge Wilson dbuf_clear_data(db); 2102dcbf3bd6SGeorge Wilson 2103dcbf3bd6SGeorge Wilson if (multilist_link_active(&db->db_cache_link)) { 2104adb52d92SMatthew Ahrens ASSERT(db->db_caching_status == DB_DBUF_CACHE || 2105adb52d92SMatthew Ahrens db->db_caching_status == DB_DBUF_METADATA_CACHE); 2106adb52d92SMatthew Ahrens 2107adb52d92SMatthew Ahrens multilist_remove(dbuf_caches[db->db_caching_status].cache, db); 2108e914ace2STim Schumacher (void) zfs_refcount_remove_many( 2109adb52d92SMatthew Ahrens &dbuf_caches[db->db_caching_status].size, 2110dcbf3bd6SGeorge Wilson db->db.db_size, db); 2111adb52d92SMatthew Ahrens 2112adb52d92SMatthew Ahrens db->db_caching_status = DB_NO_CACHE; 2113dcbf3bd6SGeorge Wilson } 2114dcbf3bd6SGeorge Wilson 211582c9918fSTim Haley ASSERT(db->db_state == DB_UNCACHED || db->db_state == DB_NOFILL); 2116fa9e4066Sahrens ASSERT(db->db_data_pending == NULL); 2117fa9e4066Sahrens 2118ea8dc4b6Seschrock db->db_state = DB_EVICTING; 2119ea8dc4b6Seschrock db->db_blkptr = NULL; 2120ea8dc4b6Seschrock 2121dcbf3bd6SGeorge Wilson /* 2122dcbf3bd6SGeorge Wilson * Now that db_state is DB_EVICTING, nobody else can find this via 2123dcbf3bd6SGeorge Wilson * the hash table. We can now drop db_mtx, which allows us to 2124dcbf3bd6SGeorge Wilson * acquire the dn_dbufs_mtx. 2125dcbf3bd6SGeorge Wilson */ 2126dcbf3bd6SGeorge Wilson mutex_exit(&db->db_mtx); 2127dcbf3bd6SGeorge Wilson 2128744947dcSTom Erickson DB_DNODE_ENTER(db); 2129744947dcSTom Erickson dn = DB_DNODE(db); 2130744947dcSTom Erickson dndb = dn->dn_dbuf; 2131dcbf3bd6SGeorge Wilson if (db->db_blkid != DMU_BONUS_BLKID) { 2132dcbf3bd6SGeorge Wilson boolean_t needlock = !MUTEX_HELD(&dn->dn_dbufs_mtx); 2133dcbf3bd6SGeorge Wilson if (needlock) 2134dcbf3bd6SGeorge Wilson mutex_enter(&dn->dn_dbufs_mtx); 21350f6d88adSAlex Reece avl_remove(&dn->dn_dbufs, db); 2136640c1670SJosef 'Jeff' Sipek atomic_dec_32(&dn->dn_dbufs_count); 2137744947dcSTom Erickson membar_producer(); 2138744947dcSTom Erickson DB_DNODE_EXIT(db); 2139dcbf3bd6SGeorge Wilson if (needlock) 2140dcbf3bd6SGeorge Wilson mutex_exit(&dn->dn_dbufs_mtx); 2141744947dcSTom Erickson /* 2142744947dcSTom Erickson * Decrementing the dbuf count means that the hold corresponding 2143744947dcSTom Erickson * to the removed dbuf is no longer discounted in dnode_move(), 2144744947dcSTom Erickson * so the dnode cannot be moved until after we release the hold. 2145744947dcSTom Erickson * The membar_producer() ensures visibility of the decremented 2146744947dcSTom Erickson * value in dnode_move(), since DB_DNODE_EXIT doesn't actually 2147744947dcSTom Erickson * release any lock. 2148744947dcSTom Erickson */ 2149c2919acbSMatthew Ahrens mutex_enter(&dn->dn_mtx); 2150c2919acbSMatthew Ahrens dnode_rele_and_unlock(dn, db, B_TRUE); 2151744947dcSTom Erickson db->db_dnode_handle = NULL; 2152dcbf3bd6SGeorge Wilson 2153dcbf3bd6SGeorge Wilson dbuf_hash_remove(db); 2154744947dcSTom Erickson } else { 2155744947dcSTom Erickson DB_DNODE_EXIT(db); 2156ea8dc4b6Seschrock } 2157ea8dc4b6Seschrock 2158e914ace2STim Schumacher ASSERT(zfs_refcount_is_zero(&db->db_holds)); 2159ea8dc4b6Seschrock 2160dcbf3bd6SGeorge Wilson db->db_parent = NULL; 2161dcbf3bd6SGeorge Wilson 2162dcbf3bd6SGeorge Wilson ASSERT(db->db_buf == NULL); 2163dcbf3bd6SGeorge Wilson ASSERT(db->db.db_data == NULL); 2164dcbf3bd6SGeorge Wilson ASSERT(db->db_hash_next == NULL); 2165dcbf3bd6SGeorge Wilson ASSERT(db->db_blkptr == NULL); 2166dcbf3bd6SGeorge Wilson ASSERT(db->db_data_pending == NULL); 2167adb52d92SMatthew Ahrens ASSERT3U(db->db_caching_status, ==, DB_NO_CACHE); 2168dcbf3bd6SGeorge Wilson ASSERT(!multilist_link_active(&db->db_cache_link)); 2169dcbf3bd6SGeorge Wilson 2170dcbf3bd6SGeorge Wilson kmem_cache_free(dbuf_kmem_cache, db); 2171dcbf3bd6SGeorge Wilson arc_space_return(sizeof (dmu_buf_impl_t), ARC_SPACE_OTHER); 2172fa9e4066Sahrens 2173fa9e4066Sahrens /* 2174744947dcSTom Erickson * If this dbuf is referenced from an indirect dbuf, 2175fa9e4066Sahrens * decrement the ref count on the indirect dbuf. 2176fa9e4066Sahrens */ 2177c2919acbSMatthew Ahrens if (parent && parent != dndb) { 2178c2919acbSMatthew Ahrens mutex_enter(&parent->db_mtx); 2179c2919acbSMatthew Ahrens dbuf_rele_and_unlock(parent, db, B_TRUE); 2180c2919acbSMatthew Ahrens } 2181fa9e4066Sahrens } 2182fa9e4066Sahrens 2183a2cdcdd2SPaul Dagnelie /* 2184a2cdcdd2SPaul Dagnelie * Note: While bpp will always be updated if the function returns success, 2185a2cdcdd2SPaul Dagnelie * parentp will not be updated if the dnode does not have dn_dbuf filled in; 2186a2cdcdd2SPaul Dagnelie * this happens when the dnode is the meta-dnode, or a userused or groupused 2187a2cdcdd2SPaul Dagnelie * object. 2188a2cdcdd2SPaul Dagnelie */ 2189fa9e4066Sahrens static int 2190fa9e4066Sahrens dbuf_findbp(dnode_t *dn, int level, uint64_t blkid, int fail_sparse, 2191fa9e4066Sahrens dmu_buf_impl_t **parentp, blkptr_t **bpp) 2192fa9e4066Sahrens { 21930b69c2f0Sahrens *parentp = NULL; 21940b69c2f0Sahrens *bpp = NULL; 21950b69c2f0Sahrens 21960a586ceaSMark Shellenbaum ASSERT(blkid != DMU_BONUS_BLKID); 21970a586ceaSMark Shellenbaum 21980a586ceaSMark Shellenbaum if (blkid == DMU_SPILL_BLKID) { 21990a586ceaSMark Shellenbaum mutex_enter(&dn->dn_mtx); 220006e0070dSMark Shellenbaum if (dn->dn_have_spill && 220106e0070dSMark Shellenbaum (dn->dn_phys->dn_flags & DNODE_FLAG_SPILL_BLKPTR)) 220254811da5SToomas Soome *bpp = DN_SPILL_BLKPTR(dn->dn_phys); 22030a586ceaSMark Shellenbaum else 22040a586ceaSMark Shellenbaum *bpp = NULL; 22050a586ceaSMark Shellenbaum dbuf_add_ref(dn->dn_dbuf, NULL); 22060a586ceaSMark Shellenbaum *parentp = dn->dn_dbuf; 22070a586ceaSMark Shellenbaum mutex_exit(&dn->dn_mtx); 22080a586ceaSMark Shellenbaum return (0); 22090a586ceaSMark Shellenbaum } 2210ea8dc4b6Seschrock 22117de35a3eSPaul Dagnelie int nlevels = 22127de35a3eSPaul Dagnelie (dn->dn_phys->dn_nlevels == 0) ? 1 : dn->dn_phys->dn_nlevels; 22137de35a3eSPaul Dagnelie int epbs = dn->dn_indblkshift - SPA_BLKPTRSHIFT; 2214fa9e4066Sahrens 2215fa9e4066Sahrens ASSERT3U(level * epbs, <, 64); 2216fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 22177de35a3eSPaul Dagnelie /* 22187de35a3eSPaul Dagnelie * This assertion shouldn't trip as long as the max indirect block size 22197de35a3eSPaul Dagnelie * is less than 1M. The reason for this is that up to that point, 22207de35a3eSPaul Dagnelie * the number of levels required to address an entire object with blocks 22217de35a3eSPaul Dagnelie * of size SPA_MINBLOCKSIZE satisfies nlevels * epbs + 1 <= 64. In 22227de35a3eSPaul Dagnelie * other words, if N * epbs + 1 > 64, then if (N-1) * epbs + 1 > 55 22237de35a3eSPaul Dagnelie * (i.e. we can address the entire object), objects will all use at most 22247de35a3eSPaul Dagnelie * N-1 levels and the assertion won't overflow. However, once epbs is 22257de35a3eSPaul Dagnelie * 13, 4 * 13 + 1 = 53, but 5 * 13 + 1 = 66. Then, 4 levels will not be 22267de35a3eSPaul Dagnelie * enough to address an entire object, so objects will have 5 levels, 22277de35a3eSPaul Dagnelie * but then this assertion will overflow. 22287de35a3eSPaul Dagnelie * 22297de35a3eSPaul Dagnelie * All this is to say that if we ever increase DN_MAX_INDBLKSHIFT, we 22307de35a3eSPaul Dagnelie * need to redo this logic to handle overflows. 22317de35a3eSPaul Dagnelie */ 22327de35a3eSPaul Dagnelie ASSERT(level >= nlevels || 22337de35a3eSPaul Dagnelie ((nlevels - level - 1) * epbs) + 22347de35a3eSPaul Dagnelie highbit64(dn->dn_phys->dn_nblkptr) <= 64); 2235ea8dc4b6Seschrock if (level >= nlevels || 22367de35a3eSPaul Dagnelie blkid >= ((uint64_t)dn->dn_phys->dn_nblkptr << 22377de35a3eSPaul Dagnelie ((nlevels - level - 1) * epbs)) || 22387de35a3eSPaul Dagnelie (fail_sparse && 22397de35a3eSPaul Dagnelie blkid > (dn->dn_phys->dn_maxblkid >> (level * epbs)))) { 2240fa9e4066Sahrens /* the buffer has no parent yet */ 2241be6fd75aSMatthew Ahrens return (SET_ERROR(ENOENT)); 2242fa9e4066Sahrens } else if (level < nlevels-1) { 2243fa9e4066Sahrens /* this block is referenced from an indirect block */ 2244fa9e4066Sahrens int err = dbuf_hold_impl(dn, level+1, 2245a2cdcdd2SPaul Dagnelie blkid >> epbs, fail_sparse, FALSE, NULL, parentp); 2246fa9e4066Sahrens if (err) 2247fa9e4066Sahrens return (err); 2248ea8dc4b6Seschrock err = dbuf_read(*parentp, NULL, 2249ea8dc4b6Seschrock (DB_RF_HAVESTRUCT | DB_RF_NOPREFETCH | DB_RF_CANFAIL)); 2250c543ec06Sahrens if (err) { 2251c543ec06Sahrens dbuf_rele(*parentp, NULL); 2252c543ec06Sahrens *parentp = NULL; 2253c543ec06Sahrens return (err); 2254c543ec06Sahrens } 2255fa9e4066Sahrens *bpp = ((blkptr_t *)(*parentp)->db.db_data) + 2256fa9e4066Sahrens (blkid & ((1ULL << epbs) - 1)); 22577de35a3eSPaul Dagnelie if (blkid > (dn->dn_phys->dn_maxblkid >> (level * epbs))) 22587de35a3eSPaul Dagnelie ASSERT(BP_IS_HOLE(*bpp)); 2259c543ec06Sahrens return (0); 2260fa9e4066Sahrens } else { 2261fa9e4066Sahrens /* the block is referenced from the dnode */ 2262fa9e4066Sahrens ASSERT3U(level, ==, nlevels-1); 2263fa9e4066Sahrens ASSERT(dn->dn_phys->dn_nblkptr == 0 || 2264fa9e4066Sahrens blkid < dn->dn_phys->dn_nblkptr); 2265c543ec06Sahrens if (dn->dn_dbuf) { 2266c543ec06Sahrens dbuf_add_ref(dn->dn_dbuf, NULL); 2267fa9e4066Sahrens *parentp = dn->dn_dbuf; 2268c543ec06Sahrens } 2269fa9e4066Sahrens *bpp = &dn->dn_phys->dn_blkptr[blkid]; 2270fa9e4066Sahrens return (0); 2271fa9e4066Sahrens } 2272fa9e4066Sahrens } 2273fa9e4066Sahrens 2274fa9e4066Sahrens static dmu_buf_impl_t * 2275fa9e4066Sahrens dbuf_create(dnode_t *dn, uint8_t level, uint64_t blkid, 2276fa9e4066Sahrens dmu_buf_impl_t *parent, blkptr_t *blkptr) 2277fa9e4066Sahrens { 2278503ad85cSMatthew Ahrens objset_t *os = dn->dn_objset; 2279fa9e4066Sahrens dmu_buf_impl_t *db, *odb; 2280fa9e4066Sahrens 2281fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 2282fa9e4066Sahrens ASSERT(dn->dn_type != DMU_OT_NONE); 2283fa9e4066Sahrens 2284dcbf3bd6SGeorge Wilson db = kmem_cache_alloc(dbuf_kmem_cache, KM_SLEEP); 2285fa9e4066Sahrens 2286fa9e4066Sahrens db->db_objset = os; 2287fa9e4066Sahrens db->db.db_object = dn->dn_object; 2288fa9e4066Sahrens db->db_level = level; 2289fa9e4066Sahrens db->db_blkid = blkid; 2290c717a561Smaybee db->db_last_dirty = NULL; 2291ea8dc4b6Seschrock db->db_dirtycnt = 0; 2292744947dcSTom Erickson db->db_dnode_handle = dn->dn_handle; 2293ea8dc4b6Seschrock db->db_parent = parent; 2294ea8dc4b6Seschrock db->db_blkptr = blkptr; 2295fa9e4066Sahrens 2296bc9014e6SJustin Gibbs db->db_user = NULL; 2297d2058105SJustin T. Gibbs db->db_user_immediate_evict = FALSE; 2298d2058105SJustin T. Gibbs db->db_freed_in_flight = FALSE; 2299d2058105SJustin T. Gibbs db->db_pending_evict = FALSE; 2300ea8dc4b6Seschrock 23010a586ceaSMark Shellenbaum if (blkid == DMU_BONUS_BLKID) { 2302ea8dc4b6Seschrock ASSERT3P(parent, ==, dn->dn_dbuf); 230354811da5SToomas Soome db->db.db_size = DN_SLOTS_TO_BONUSLEN(dn->dn_num_slots) - 23041934e92fSmaybee (dn->dn_nblkptr-1) * sizeof (blkptr_t); 23051934e92fSmaybee ASSERT3U(db->db.db_size, >=, dn->dn_bonuslen); 23060a586ceaSMark Shellenbaum db->db.db_offset = DMU_BONUS_BLKID; 2307ea8dc4b6Seschrock db->db_state = DB_UNCACHED; 2308adb52d92SMatthew Ahrens db->db_caching_status = DB_NO_CACHE; 2309ea8dc4b6Seschrock /* the bonus dbuf is not placed in the hash table */ 23105a98e54bSBrendan Gregg - Sun Microsystems arc_space_consume(sizeof (dmu_buf_impl_t), ARC_SPACE_OTHER); 2311ea8dc4b6Seschrock return (db); 23120a586ceaSMark Shellenbaum } else if (blkid == DMU_SPILL_BLKID) { 23130a586ceaSMark Shellenbaum db->db.db_size = (blkptr != NULL) ? 23140a586ceaSMark Shellenbaum BP_GET_LSIZE(blkptr) : SPA_MINBLOCKSIZE; 23150a586ceaSMark Shellenbaum db->db.db_offset = 0; 2316fa9e4066Sahrens } else { 2317fa9e4066Sahrens int blocksize = 2318fa9e4066Sahrens db->db_level ? 1 << dn->dn_indblkshift : dn->dn_datablksz; 2319fa9e4066Sahrens db->db.db_size = blocksize; 2320fa9e4066Sahrens db->db.db_offset = db->db_blkid * blocksize; 2321fa9e4066Sahrens } 2322fa9e4066Sahrens 2323fa9e4066Sahrens /* 2324fa9e4066Sahrens * Hold the dn_dbufs_mtx while we get the new dbuf 2325fa9e4066Sahrens * in the hash table *and* added to the dbufs list. 2326fa9e4066Sahrens * This prevents a possible deadlock with someone 2327fa9e4066Sahrens * trying to look up this dbuf before its added to the 2328fa9e4066Sahrens * dn_dbufs list. 2329fa9e4066Sahrens */ 2330fa9e4066Sahrens mutex_enter(&dn->dn_dbufs_mtx); 2331ea8dc4b6Seschrock db->db_state = DB_EVICTING; 2332fa9e4066Sahrens if ((odb = dbuf_hash_insert(db)) != NULL) { 2333fa9e4066Sahrens /* someone else inserted it first */ 2334dcbf3bd6SGeorge Wilson kmem_cache_free(dbuf_kmem_cache, db); 2335fa9e4066Sahrens mutex_exit(&dn->dn_dbufs_mtx); 2336fa9e4066Sahrens return (odb); 2337fa9e4066Sahrens } 23380f6d88adSAlex Reece avl_add(&dn->dn_dbufs, db); 2339653af1b8SStephen Blinick 2340ea8dc4b6Seschrock db->db_state = DB_UNCACHED; 2341adb52d92SMatthew Ahrens db->db_caching_status = DB_NO_CACHE; 2342fa9e4066Sahrens mutex_exit(&dn->dn_dbufs_mtx); 23435a98e54bSBrendan Gregg - Sun Microsystems arc_space_consume(sizeof (dmu_buf_impl_t), ARC_SPACE_OTHER); 2344fa9e4066Sahrens 2345fa9e4066Sahrens if (parent && parent != dn->dn_dbuf) 2346fa9e4066Sahrens dbuf_add_ref(parent, db); 2347fa9e4066Sahrens 2348ea8dc4b6Seschrock ASSERT(dn->dn_object == DMU_META_DNODE_OBJECT || 2349e914ace2STim Schumacher zfs_refcount_count(&dn->dn_holds) > 0); 2350e914ace2STim Schumacher (void) zfs_refcount_add(&dn->dn_holds, db); 2351640c1670SJosef 'Jeff' Sipek atomic_inc_32(&dn->dn_dbufs_count); 2352fa9e4066Sahrens 2353fa9e4066Sahrens dprintf_dbuf(db, "db=%p\n", db); 2354fa9e4066Sahrens 2355fa9e4066Sahrens return (db); 2356fa9e4066Sahrens } 2357fa9e4066Sahrens 2358a2cdcdd2SPaul Dagnelie typedef struct dbuf_prefetch_arg { 2359a2cdcdd2SPaul Dagnelie spa_t *dpa_spa; /* The spa to issue the prefetch in. */ 2360a2cdcdd2SPaul Dagnelie zbookmark_phys_t dpa_zb; /* The target block to prefetch. */ 2361a2cdcdd2SPaul Dagnelie int dpa_epbs; /* Entries (blkptr_t's) Per Block Shift. */ 2362a2cdcdd2SPaul Dagnelie int dpa_curlevel; /* The current level that we're reading */ 2363dcbf3bd6SGeorge Wilson dnode_t *dpa_dnode; /* The dnode associated with the prefetch */ 2364a2cdcdd2SPaul Dagnelie zio_priority_t dpa_prio; /* The priority I/Os should be issued at. */ 2365a2cdcdd2SPaul Dagnelie zio_t *dpa_zio; /* The parent zio_t for all prefetches. */ 2366a2cdcdd2SPaul Dagnelie arc_flags_t dpa_aflags; /* Flags to pass to the final prefetch. */ 2367a2cdcdd2SPaul Dagnelie } dbuf_prefetch_arg_t; 2368a2cdcdd2SPaul Dagnelie 2369a2cdcdd2SPaul Dagnelie /* 2370a2cdcdd2SPaul Dagnelie * Actually issue the prefetch read for the block given. 2371a2cdcdd2SPaul Dagnelie */ 2372a2cdcdd2SPaul Dagnelie static void 2373a2cdcdd2SPaul Dagnelie dbuf_issue_final_prefetch(dbuf_prefetch_arg_t *dpa, blkptr_t *bp) 2374fa9e4066Sahrens { 2375a2cdcdd2SPaul Dagnelie if (BP_IS_HOLE(bp) || BP_IS_EMBEDDED(bp)) 2376a2cdcdd2SPaul Dagnelie return; 2377a2cdcdd2SPaul Dagnelie 2378a2cdcdd2SPaul Dagnelie arc_flags_t aflags = 2379a2cdcdd2SPaul Dagnelie dpa->dpa_aflags | ARC_FLAG_NOWAIT | ARC_FLAG_PREFETCH; 2380a2cdcdd2SPaul Dagnelie 2381a2cdcdd2SPaul Dagnelie ASSERT3U(dpa->dpa_curlevel, ==, BP_GET_LEVEL(bp)); 2382a2cdcdd2SPaul Dagnelie ASSERT3U(dpa->dpa_curlevel, ==, dpa->dpa_zb.zb_level); 2383a2cdcdd2SPaul Dagnelie ASSERT(dpa->dpa_zio != NULL); 2384a2cdcdd2SPaul Dagnelie (void) arc_read(dpa->dpa_zio, dpa->dpa_spa, bp, NULL, NULL, 2385a2cdcdd2SPaul Dagnelie dpa->dpa_prio, ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE, 2386a2cdcdd2SPaul Dagnelie &aflags, &dpa->dpa_zb); 2387a2cdcdd2SPaul Dagnelie } 2388a2cdcdd2SPaul Dagnelie 2389a2cdcdd2SPaul Dagnelie /* 2390a2cdcdd2SPaul Dagnelie * Called when an indirect block above our prefetch target is read in. This 2391a2cdcdd2SPaul Dagnelie * will either read in the next indirect block down the tree or issue the actual 2392a2cdcdd2SPaul Dagnelie * prefetch if the next block down is our target. 2393a2cdcdd2SPaul Dagnelie */ 2394a2cdcdd2SPaul Dagnelie static void 2395a2cdcdd2SPaul Dagnelie dbuf_prefetch_indirect_done(zio_t *zio, arc_buf_t *abuf, void *private) 2396a2cdcdd2SPaul Dagnelie { 2397a2cdcdd2SPaul Dagnelie dbuf_prefetch_arg_t *dpa = private; 2398a2cdcdd2SPaul Dagnelie 2399a2cdcdd2SPaul Dagnelie ASSERT3S(dpa->dpa_zb.zb_level, <, dpa->dpa_curlevel); 2400a2cdcdd2SPaul Dagnelie ASSERT3S(dpa->dpa_curlevel, >, 0); 2401dcbf3bd6SGeorge Wilson 2402fa98e487SMatthew Ahrens if (abuf == NULL) { 2403fa98e487SMatthew Ahrens ASSERT(zio == NULL || zio->io_error != 0); 2404fa98e487SMatthew Ahrens kmem_free(dpa, sizeof (*dpa)); 2405fa98e487SMatthew Ahrens return; 2406fa98e487SMatthew Ahrens } 2407fa98e487SMatthew Ahrens ASSERT(zio == NULL || zio->io_error == 0); 2408fa98e487SMatthew Ahrens 2409dcbf3bd6SGeorge Wilson /* 2410dcbf3bd6SGeorge Wilson * The dpa_dnode is only valid if we are called with a NULL 2411dcbf3bd6SGeorge Wilson * zio. This indicates that the arc_read() returned without 2412dcbf3bd6SGeorge Wilson * first calling zio_read() to issue a physical read. Once 2413dcbf3bd6SGeorge Wilson * a physical read is made the dpa_dnode must be invalidated 2414dcbf3bd6SGeorge Wilson * as the locks guarding it may have been dropped. If the 2415dcbf3bd6SGeorge Wilson * dpa_dnode is still valid, then we want to add it to the dbuf 2416dcbf3bd6SGeorge Wilson * cache. To do so, we must hold the dbuf associated with the block 2417dcbf3bd6SGeorge Wilson * we just prefetched, read its contents so that we associate it 2418dcbf3bd6SGeorge Wilson * with an arc_buf_t, and then release it. 2419dcbf3bd6SGeorge Wilson */ 2420a2cdcdd2SPaul Dagnelie if (zio != NULL) { 2421a2cdcdd2SPaul Dagnelie ASSERT3S(BP_GET_LEVEL(zio->io_bp), ==, dpa->dpa_curlevel); 2422dcbf3bd6SGeorge Wilson if (zio->io_flags & ZIO_FLAG_RAW) { 2423dcbf3bd6SGeorge Wilson ASSERT3U(BP_GET_PSIZE(zio->io_bp), ==, zio->io_size); 2424dcbf3bd6SGeorge Wilson } else { 2425a2cdcdd2SPaul Dagnelie ASSERT3U(BP_GET_LSIZE(zio->io_bp), ==, zio->io_size); 2426dcbf3bd6SGeorge Wilson } 2427a2cdcdd2SPaul Dagnelie ASSERT3P(zio->io_spa, ==, dpa->dpa_spa); 2428dcbf3bd6SGeorge Wilson 2429dcbf3bd6SGeorge Wilson dpa->dpa_dnode = NULL; 2430dcbf3bd6SGeorge Wilson } else if (dpa->dpa_dnode != NULL) { 2431dcbf3bd6SGeorge Wilson uint64_t curblkid = dpa->dpa_zb.zb_blkid >> 2432dcbf3bd6SGeorge Wilson (dpa->dpa_epbs * (dpa->dpa_curlevel - 2433dcbf3bd6SGeorge Wilson dpa->dpa_zb.zb_level)); 2434dcbf3bd6SGeorge Wilson dmu_buf_impl_t *db = dbuf_hold_level(dpa->dpa_dnode, 2435dcbf3bd6SGeorge Wilson dpa->dpa_curlevel, curblkid, FTAG); 2436dcbf3bd6SGeorge Wilson (void) dbuf_read(db, NULL, 2437dcbf3bd6SGeorge Wilson DB_RF_MUST_SUCCEED | DB_RF_NOPREFETCH | DB_RF_HAVESTRUCT); 2438dcbf3bd6SGeorge Wilson dbuf_rele(db, FTAG); 2439a2cdcdd2SPaul Dagnelie } 2440a2cdcdd2SPaul Dagnelie 2441a2cdcdd2SPaul Dagnelie dpa->dpa_curlevel--; 2442a2cdcdd2SPaul Dagnelie 2443a2cdcdd2SPaul Dagnelie uint64_t nextblkid = dpa->dpa_zb.zb_blkid >> 2444a2cdcdd2SPaul Dagnelie (dpa->dpa_epbs * (dpa->dpa_curlevel - dpa->dpa_zb.zb_level)); 2445a2cdcdd2SPaul Dagnelie blkptr_t *bp = ((blkptr_t *)abuf->b_data) + 2446a2cdcdd2SPaul Dagnelie P2PHASE(nextblkid, 1ULL << dpa->dpa_epbs); 2447fa98e487SMatthew Ahrens if (BP_IS_HOLE(bp)) { 2448a2cdcdd2SPaul Dagnelie kmem_free(dpa, sizeof (*dpa)); 2449a2cdcdd2SPaul Dagnelie } else if (dpa->dpa_curlevel == dpa->dpa_zb.zb_level) { 2450a2cdcdd2SPaul Dagnelie ASSERT3U(nextblkid, ==, dpa->dpa_zb.zb_blkid); 2451a2cdcdd2SPaul Dagnelie dbuf_issue_final_prefetch(dpa, bp); 2452a2cdcdd2SPaul Dagnelie kmem_free(dpa, sizeof (*dpa)); 2453a2cdcdd2SPaul Dagnelie } else { 2454a2cdcdd2SPaul Dagnelie arc_flags_t iter_aflags = ARC_FLAG_NOWAIT; 2455a2cdcdd2SPaul Dagnelie zbookmark_phys_t zb; 2456a2cdcdd2SPaul Dagnelie 245727295216Sbenrubson /* flag if L2ARC eligible, l2arc_noprefetch then decides */ 245827295216Sbenrubson if (dpa->dpa_aflags & ARC_FLAG_L2CACHE) 245927295216Sbenrubson iter_aflags |= ARC_FLAG_L2CACHE; 246027295216Sbenrubson 2461a2cdcdd2SPaul Dagnelie ASSERT3U(dpa->dpa_curlevel, ==, BP_GET_LEVEL(bp)); 2462a2cdcdd2SPaul Dagnelie 2463a2cdcdd2SPaul Dagnelie SET_BOOKMARK(&zb, dpa->dpa_zb.zb_objset, 2464a2cdcdd2SPaul Dagnelie dpa->dpa_zb.zb_object, dpa->dpa_curlevel, nextblkid); 2465a2cdcdd2SPaul Dagnelie 2466a2cdcdd2SPaul Dagnelie (void) arc_read(dpa->dpa_zio, dpa->dpa_spa, 2467a2cdcdd2SPaul Dagnelie bp, dbuf_prefetch_indirect_done, dpa, dpa->dpa_prio, 2468a2cdcdd2SPaul Dagnelie ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE, 2469a2cdcdd2SPaul Dagnelie &iter_aflags, &zb); 2470a2cdcdd2SPaul Dagnelie } 2471dcbf3bd6SGeorge Wilson 2472dcbf3bd6SGeorge Wilson arc_buf_destroy(abuf, private); 2473a2cdcdd2SPaul Dagnelie } 2474a2cdcdd2SPaul Dagnelie 2475a2cdcdd2SPaul Dagnelie /* 2476a2cdcdd2SPaul Dagnelie * Issue prefetch reads for the given block on the given level. If the indirect 2477a2cdcdd2SPaul Dagnelie * blocks above that block are not in memory, we will read them in 2478a2cdcdd2SPaul Dagnelie * asynchronously. As a result, this call never blocks waiting for a read to 2479a2cdcdd2SPaul Dagnelie * complete. 2480a2cdcdd2SPaul Dagnelie */ 2481a2cdcdd2SPaul Dagnelie void 2482a2cdcdd2SPaul Dagnelie dbuf_prefetch(dnode_t *dn, int64_t level, uint64_t blkid, zio_priority_t prio, 2483a2cdcdd2SPaul Dagnelie arc_flags_t aflags) 2484a2cdcdd2SPaul Dagnelie { 2485a2cdcdd2SPaul Dagnelie blkptr_t bp; 2486a2cdcdd2SPaul Dagnelie int epbs, nlevels, curlevel; 2487a2cdcdd2SPaul Dagnelie uint64_t curblkid; 2488fa9e4066Sahrens 24890a586ceaSMark Shellenbaum ASSERT(blkid != DMU_BONUS_BLKID); 2490fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 2491fa9e4066Sahrens 2492cf6106c8SMatthew Ahrens if (blkid > dn->dn_maxblkid) 2493cf6106c8SMatthew Ahrens return; 2494cf6106c8SMatthew Ahrens 2495fa9e4066Sahrens if (dnode_block_freed(dn, blkid)) 2496fa9e4066Sahrens return; 2497fa9e4066Sahrens 2498fa9e4066Sahrens /* 2499a2cdcdd2SPaul Dagnelie * This dnode hasn't been written to disk yet, so there's nothing to 2500a2cdcdd2SPaul Dagnelie * prefetch. 2501fa9e4066Sahrens */ 2502a2cdcdd2SPaul Dagnelie nlevels = dn->dn_phys->dn_nlevels; 2503a2cdcdd2SPaul Dagnelie if (level >= nlevels || dn->dn_phys->dn_nblkptr == 0) 2504a2cdcdd2SPaul Dagnelie return; 2505a2cdcdd2SPaul Dagnelie 2506a2cdcdd2SPaul Dagnelie epbs = dn->dn_phys->dn_indblkshift - SPA_BLKPTRSHIFT; 2507a2cdcdd2SPaul Dagnelie if (dn->dn_phys->dn_maxblkid < blkid << (epbs * level)) 2508a2cdcdd2SPaul Dagnelie return; 2509a2cdcdd2SPaul Dagnelie 2510a2cdcdd2SPaul Dagnelie dmu_buf_impl_t *db = dbuf_find(dn->dn_objset, dn->dn_object, 2511a2cdcdd2SPaul Dagnelie level, blkid); 2512a2cdcdd2SPaul Dagnelie if (db != NULL) { 2513fa9e4066Sahrens mutex_exit(&db->db_mtx); 2514a2cdcdd2SPaul Dagnelie /* 2515a2cdcdd2SPaul Dagnelie * This dbuf already exists. It is either CACHED, or 2516a2cdcdd2SPaul Dagnelie * (we assume) about to be read or filled. 2517a2cdcdd2SPaul Dagnelie */ 2518fa9e4066Sahrens return; 2519fa9e4066Sahrens } 2520fa9e4066Sahrens 2521a2cdcdd2SPaul Dagnelie /* 2522a2cdcdd2SPaul Dagnelie * Find the closest ancestor (indirect block) of the target block 2523a2cdcdd2SPaul Dagnelie * that is present in the cache. In this indirect block, we will 2524a2cdcdd2SPaul Dagnelie * find the bp that is at curlevel, curblkid. 2525a2cdcdd2SPaul Dagnelie */ 2526a2cdcdd2SPaul Dagnelie curlevel = level; 2527a2cdcdd2SPaul Dagnelie curblkid = blkid; 2528a2cdcdd2SPaul Dagnelie while (curlevel < nlevels - 1) { 2529a2cdcdd2SPaul Dagnelie int parent_level = curlevel + 1; 2530a2cdcdd2SPaul Dagnelie uint64_t parent_blkid = curblkid >> epbs; 2531a2cdcdd2SPaul Dagnelie dmu_buf_impl_t *db; 2532a2cdcdd2SPaul Dagnelie 2533a2cdcdd2SPaul Dagnelie if (dbuf_hold_impl(dn, parent_level, parent_blkid, 2534a2cdcdd2SPaul Dagnelie FALSE, TRUE, FTAG, &db) == 0) { 2535a2cdcdd2SPaul Dagnelie blkptr_t *bpp = db->db_buf->b_data; 2536a2cdcdd2SPaul Dagnelie bp = bpp[P2PHASE(curblkid, 1 << epbs)]; 2537a2cdcdd2SPaul Dagnelie dbuf_rele(db, FTAG); 2538a2cdcdd2SPaul Dagnelie break; 2539a2cdcdd2SPaul Dagnelie } 2540a2cdcdd2SPaul Dagnelie 2541a2cdcdd2SPaul Dagnelie curlevel = parent_level; 2542a2cdcdd2SPaul Dagnelie curblkid = parent_blkid; 2543a2cdcdd2SPaul Dagnelie } 2544a2cdcdd2SPaul Dagnelie 2545a2cdcdd2SPaul Dagnelie if (curlevel == nlevels - 1) { 2546a2cdcdd2SPaul Dagnelie /* No cached indirect blocks found. */ 2547a2cdcdd2SPaul Dagnelie ASSERT3U(curblkid, <, dn->dn_phys->dn_nblkptr); 2548a2cdcdd2SPaul Dagnelie bp = dn->dn_phys->dn_blkptr[curblkid]; 2549a2cdcdd2SPaul Dagnelie } 2550a2cdcdd2SPaul Dagnelie if (BP_IS_HOLE(&bp)) 2551a2cdcdd2SPaul Dagnelie return; 2552a2cdcdd2SPaul Dagnelie 2553a2cdcdd2SPaul Dagnelie ASSERT3U(curlevel, ==, BP_GET_LEVEL(&bp)); 2554a2cdcdd2SPaul Dagnelie 2555a2cdcdd2SPaul Dagnelie zio_t *pio = zio_root(dmu_objset_spa(dn->dn_objset), NULL, NULL, 2556a2cdcdd2SPaul Dagnelie ZIO_FLAG_CANFAIL); 2557a2cdcdd2SPaul Dagnelie 2558a2cdcdd2SPaul Dagnelie dbuf_prefetch_arg_t *dpa = kmem_zalloc(sizeof (*dpa), KM_SLEEP); 2559b24ab676SJeff Bonwick dsl_dataset_t *ds = dn->dn_objset->os_dsl_dataset; 2560a2cdcdd2SPaul Dagnelie SET_BOOKMARK(&dpa->dpa_zb, ds != NULL ? ds->ds_object : DMU_META_OBJSET, 2561a2cdcdd2SPaul Dagnelie dn->dn_object, level, blkid); 2562a2cdcdd2SPaul Dagnelie dpa->dpa_curlevel = curlevel; 2563a2cdcdd2SPaul Dagnelie dpa->dpa_prio = prio; 2564a2cdcdd2SPaul Dagnelie dpa->dpa_aflags = aflags; 2565a2cdcdd2SPaul Dagnelie dpa->dpa_spa = dn->dn_objset->os_spa; 2566dcbf3bd6SGeorge Wilson dpa->dpa_dnode = dn; 2567a2cdcdd2SPaul Dagnelie dpa->dpa_epbs = epbs; 2568a2cdcdd2SPaul Dagnelie dpa->dpa_zio = pio; 2569a2cdcdd2SPaul Dagnelie 257027295216Sbenrubson /* flag if L2ARC eligible, l2arc_noprefetch then decides */ 257127295216Sbenrubson if (DNODE_LEVEL_IS_L2CACHEABLE(dn, level)) 257227295216Sbenrubson dpa->dpa_aflags |= ARC_FLAG_L2CACHE; 257327295216Sbenrubson 2574a2cdcdd2SPaul Dagnelie /* 2575a2cdcdd2SPaul Dagnelie * If we have the indirect just above us, no need to do the asynchronous 2576a2cdcdd2SPaul Dagnelie * prefetch chain; we'll just run the last step ourselves. If we're at 2577a2cdcdd2SPaul Dagnelie * a higher level, though, we want to issue the prefetches for all the 2578a2cdcdd2SPaul Dagnelie * indirect blocks asynchronously, so we can go on with whatever we were 2579a2cdcdd2SPaul Dagnelie * doing. 2580a2cdcdd2SPaul Dagnelie */ 2581a2cdcdd2SPaul Dagnelie if (curlevel == level) { 2582a2cdcdd2SPaul Dagnelie ASSERT3U(curblkid, ==, blkid); 2583a2cdcdd2SPaul Dagnelie dbuf_issue_final_prefetch(dpa, &bp); 2584a2cdcdd2SPaul Dagnelie kmem_free(dpa, sizeof (*dpa)); 2585a2cdcdd2SPaul Dagnelie } else { 2586a2cdcdd2SPaul Dagnelie arc_flags_t iter_aflags = ARC_FLAG_NOWAIT; 25877802d7bfSMatthew Ahrens zbookmark_phys_t zb; 2588b24ab676SJeff Bonwick 258927295216Sbenrubson /* flag if L2ARC eligible, l2arc_noprefetch then decides */ 259027295216Sbenrubson if (DNODE_LEVEL_IS_L2CACHEABLE(dn, level)) 259127295216Sbenrubson iter_aflags |= ARC_FLAG_L2CACHE; 259227295216Sbenrubson 2593a2cdcdd2SPaul Dagnelie SET_BOOKMARK(&zb, ds != NULL ? ds->ds_object : DMU_META_OBJSET, 2594a2cdcdd2SPaul Dagnelie dn->dn_object, curlevel, curblkid); 2595a2cdcdd2SPaul Dagnelie (void) arc_read(dpa->dpa_zio, dpa->dpa_spa, 2596a2cdcdd2SPaul Dagnelie &bp, dbuf_prefetch_indirect_done, dpa, prio, 2597fa9e4066Sahrens ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE, 2598a2cdcdd2SPaul Dagnelie &iter_aflags, &zb); 2599fa9e4066Sahrens } 2600a2cdcdd2SPaul Dagnelie /* 2601a2cdcdd2SPaul Dagnelie * We use pio here instead of dpa_zio since it's possible that 2602a2cdcdd2SPaul Dagnelie * dpa may have already been freed. 2603a2cdcdd2SPaul Dagnelie */ 2604a2cdcdd2SPaul Dagnelie zio_nowait(pio); 2605fa9e4066Sahrens } 2606fa9e4066Sahrens 2607fa9e4066Sahrens /* 2608fa9e4066Sahrens * Returns with db_holds incremented, and db_mtx not held. 2609fa9e4066Sahrens * Note: dn_struct_rwlock must be held. 2610fa9e4066Sahrens */ 2611fa9e4066Sahrens int 2612a2cdcdd2SPaul Dagnelie dbuf_hold_impl(dnode_t *dn, uint8_t level, uint64_t blkid, 2613a2cdcdd2SPaul Dagnelie boolean_t fail_sparse, boolean_t fail_uncached, 2614fa9e4066Sahrens void *tag, dmu_buf_impl_t **dbp) 2615fa9e4066Sahrens { 2616fa9e4066Sahrens dmu_buf_impl_t *db, *parent = NULL; 2617fa9e4066Sahrens 26180a586ceaSMark Shellenbaum ASSERT(blkid != DMU_BONUS_BLKID); 2619fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 2620fa9e4066Sahrens ASSERT3U(dn->dn_nlevels, >, level); 2621fa9e4066Sahrens 2622fa9e4066Sahrens *dbp = NULL; 2623ea8dc4b6Seschrock top: 2624fa9e4066Sahrens /* dbuf_find() returns with db_mtx held */ 2625e57a022bSJustin T. Gibbs db = dbuf_find(dn->dn_objset, dn->dn_object, level, blkid); 2626fa9e4066Sahrens 2627fa9e4066Sahrens if (db == NULL) { 2628fa9e4066Sahrens blkptr_t *bp = NULL; 2629fa9e4066Sahrens int err; 2630fa9e4066Sahrens 2631a2cdcdd2SPaul Dagnelie if (fail_uncached) 2632a2cdcdd2SPaul Dagnelie return (SET_ERROR(ENOENT)); 2633a2cdcdd2SPaul Dagnelie 2634c543ec06Sahrens ASSERT3P(parent, ==, NULL); 2635fa9e4066Sahrens err = dbuf_findbp(dn, level, blkid, fail_sparse, &parent, &bp); 2636fa9e4066Sahrens if (fail_sparse) { 2637fa9e4066Sahrens if (err == 0 && bp && BP_IS_HOLE(bp)) 2638be6fd75aSMatthew Ahrens err = SET_ERROR(ENOENT); 2639fa9e4066Sahrens if (err) { 2640c543ec06Sahrens if (parent) 2641ea8dc4b6Seschrock dbuf_rele(parent, NULL); 2642fa9e4066Sahrens return (err); 2643fa9e4066Sahrens } 2644fa9e4066Sahrens } 2645ea8dc4b6Seschrock if (err && err != ENOENT) 2646ea8dc4b6Seschrock return (err); 2647fa9e4066Sahrens db = dbuf_create(dn, level, blkid, parent, bp); 2648fa9e4066Sahrens } 2649fa9e4066Sahrens 2650a2cdcdd2SPaul Dagnelie if (fail_uncached && db->db_state != DB_CACHED) { 2651a2cdcdd2SPaul Dagnelie mutex_exit(&db->db_mtx); 2652a2cdcdd2SPaul Dagnelie return (SET_ERROR(ENOENT)); 2653a2cdcdd2SPaul Dagnelie } 2654a2cdcdd2SPaul Dagnelie 2655*7b38fab6SAlexander Motin if (db->db_buf != NULL) { 2656*7b38fab6SAlexander Motin arc_buf_access(db->db_buf); 2657ea8dc4b6Seschrock ASSERT3P(db->db.db_data, ==, db->db_buf->b_data); 2658*7b38fab6SAlexander Motin } 2659ea8dc4b6Seschrock 2660ea8dc4b6Seschrock ASSERT(db->db_buf == NULL || arc_referenced(db->db_buf)); 2661ea8dc4b6Seschrock 2662fa9e4066Sahrens /* 2663c717a561Smaybee * If this buffer is currently syncing out, and we are are 2664c717a561Smaybee * still referencing it from db_data, we need to make a copy 2665c717a561Smaybee * of it in case we decide we want to dirty it again in this txg. 2666fa9e4066Sahrens */ 26670a586ceaSMark Shellenbaum if (db->db_level == 0 && db->db_blkid != DMU_BONUS_BLKID && 2668ea8dc4b6Seschrock dn->dn_object != DMU_META_DNODE_OBJECT && 2669c717a561Smaybee db->db_state == DB_CACHED && db->db_data_pending) { 2670c717a561Smaybee dbuf_dirty_record_t *dr = db->db_data_pending; 2671c717a561Smaybee 2672c717a561Smaybee if (dr->dt.dl.dr_data == db->db_buf) { 2673ad23a2dbSjohansen arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 2674fa9e4066Sahrens 2675c717a561Smaybee dbuf_set_data(db, 26765602294fSDan Kimmel arc_alloc_buf(dn->dn_objset->os_spa, db, type, 26775602294fSDan Kimmel db->db.db_size)); 2678c717a561Smaybee bcopy(dr->dt.dl.dr_data->b_data, db->db.db_data, 2679fa9e4066Sahrens db->db.db_size); 2680fa9e4066Sahrens } 2681c717a561Smaybee } 2682fa9e4066Sahrens 2683dcbf3bd6SGeorge Wilson if (multilist_link_active(&db->db_cache_link)) { 2684e914ace2STim Schumacher ASSERT(zfs_refcount_is_zero(&db->db_holds)); 2685adb52d92SMatthew Ahrens ASSERT(db->db_caching_status == DB_DBUF_CACHE || 2686adb52d92SMatthew Ahrens db->db_caching_status == DB_DBUF_METADATA_CACHE); 2687adb52d92SMatthew Ahrens 2688adb52d92SMatthew Ahrens multilist_remove(dbuf_caches[db->db_caching_status].cache, db); 2689e914ace2STim Schumacher (void) zfs_refcount_remove_many( 2690adb52d92SMatthew Ahrens &dbuf_caches[db->db_caching_status].size, 2691dcbf3bd6SGeorge Wilson db->db.db_size, db); 2692adb52d92SMatthew Ahrens 2693adb52d92SMatthew Ahrens db->db_caching_status = DB_NO_CACHE; 2694dcbf3bd6SGeorge Wilson } 2695e914ace2STim Schumacher (void) zfs_refcount_add(&db->db_holds, tag); 26969c9dc39aSek110237 DBUF_VERIFY(db); 2697fa9e4066Sahrens mutex_exit(&db->db_mtx); 2698fa9e4066Sahrens 2699fa9e4066Sahrens /* NOTE: we can't rele the parent until after we drop the db_mtx */ 2700c543ec06Sahrens if (parent) 2701ea8dc4b6Seschrock dbuf_rele(parent, NULL); 2702fa9e4066Sahrens 2703744947dcSTom Erickson ASSERT3P(DB_DNODE(db), ==, dn); 2704fa9e4066Sahrens ASSERT3U(db->db_blkid, ==, blkid); 2705fa9e4066Sahrens ASSERT3U(db->db_level, ==, level); 2706fa9e4066Sahrens *dbp = db; 2707fa9e4066Sahrens 2708fa9e4066Sahrens return (0); 2709fa9e4066Sahrens } 2710fa9e4066Sahrens 2711fa9e4066Sahrens dmu_buf_impl_t * 2712ea8dc4b6Seschrock dbuf_hold(dnode_t *dn, uint64_t blkid, void *tag) 2713fa9e4066Sahrens { 2714a2cdcdd2SPaul Dagnelie return (dbuf_hold_level(dn, 0, blkid, tag)); 2715fa9e4066Sahrens } 2716fa9e4066Sahrens 2717fa9e4066Sahrens dmu_buf_impl_t * 2718fa9e4066Sahrens dbuf_hold_level(dnode_t *dn, int level, uint64_t blkid, void *tag) 2719fa9e4066Sahrens { 2720fa9e4066Sahrens dmu_buf_impl_t *db; 2721a2cdcdd2SPaul Dagnelie int err = dbuf_hold_impl(dn, level, blkid, FALSE, FALSE, tag, &db); 2722ea8dc4b6Seschrock return (err ? NULL : db); 2723fa9e4066Sahrens } 2724fa9e4066Sahrens 27251934e92fSmaybee void 2726ea8dc4b6Seschrock dbuf_create_bonus(dnode_t *dn) 2727fa9e4066Sahrens { 2728ea8dc4b6Seschrock ASSERT(RW_WRITE_HELD(&dn->dn_struct_rwlock)); 2729ea8dc4b6Seschrock 2730ea8dc4b6Seschrock ASSERT(dn->dn_bonus == NULL); 27310a586ceaSMark Shellenbaum dn->dn_bonus = dbuf_create(dn, 0, DMU_BONUS_BLKID, dn->dn_dbuf, NULL); 27320a586ceaSMark Shellenbaum } 27330a586ceaSMark Shellenbaum 27340a586ceaSMark Shellenbaum int 27350a586ceaSMark Shellenbaum dbuf_spill_set_blksz(dmu_buf_t *db_fake, uint64_t blksz, dmu_tx_t *tx) 27360a586ceaSMark Shellenbaum { 27370a586ceaSMark Shellenbaum dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 2738744947dcSTom Erickson dnode_t *dn; 2739744947dcSTom Erickson 27400a586ceaSMark Shellenbaum if (db->db_blkid != DMU_SPILL_BLKID) 2741be6fd75aSMatthew Ahrens return (SET_ERROR(ENOTSUP)); 27420a586ceaSMark Shellenbaum if (blksz == 0) 27430a586ceaSMark Shellenbaum blksz = SPA_MINBLOCKSIZE; 2744b5152584SMatthew Ahrens ASSERT3U(blksz, <=, spa_maxblocksize(dmu_objset_spa(db->db_objset))); 27450a586ceaSMark Shellenbaum blksz = P2ROUNDUP(blksz, SPA_MINBLOCKSIZE); 27460a586ceaSMark Shellenbaum 2747744947dcSTom Erickson DB_DNODE_ENTER(db); 2748744947dcSTom Erickson dn = DB_DNODE(db); 2749744947dcSTom Erickson rw_enter(&dn->dn_struct_rwlock, RW_WRITER); 27500a586ceaSMark Shellenbaum dbuf_new_size(db, blksz, tx); 2751744947dcSTom Erickson rw_exit(&dn->dn_struct_rwlock); 2752744947dcSTom Erickson DB_DNODE_EXIT(db); 27530a586ceaSMark Shellenbaum 27540a586ceaSMark Shellenbaum return (0); 27550a586ceaSMark Shellenbaum } 27560a586ceaSMark Shellenbaum 27570a586ceaSMark Shellenbaum void 27580a586ceaSMark Shellenbaum dbuf_rm_spill(dnode_t *dn, dmu_tx_t *tx) 27590a586ceaSMark Shellenbaum { 27600a586ceaSMark Shellenbaum dbuf_free_range(dn, DMU_SPILL_BLKID, DMU_SPILL_BLKID, tx); 2761fa9e4066Sahrens } 2762fa9e4066Sahrens 2763ea8dc4b6Seschrock #pragma weak dmu_buf_add_ref = dbuf_add_ref 2764fa9e4066Sahrens void 2765fa9e4066Sahrens dbuf_add_ref(dmu_buf_impl_t *db, void *tag) 2766fa9e4066Sahrens { 2767e914ace2STim Schumacher int64_t holds = zfs_refcount_add(&db->db_holds, tag); 2768dcbf3bd6SGeorge Wilson ASSERT3S(holds, >, 1); 2769fa9e4066Sahrens } 2770fa9e4066Sahrens 2771e57a022bSJustin T. Gibbs #pragma weak dmu_buf_try_add_ref = dbuf_try_add_ref 2772e57a022bSJustin T. Gibbs boolean_t 2773e57a022bSJustin T. Gibbs dbuf_try_add_ref(dmu_buf_t *db_fake, objset_t *os, uint64_t obj, uint64_t blkid, 2774e57a022bSJustin T. Gibbs void *tag) 2775e57a022bSJustin T. Gibbs { 2776e57a022bSJustin T. Gibbs dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 2777e57a022bSJustin T. Gibbs dmu_buf_impl_t *found_db; 2778e57a022bSJustin T. Gibbs boolean_t result = B_FALSE; 2779e57a022bSJustin T. Gibbs 2780e57a022bSJustin T. Gibbs if (db->db_blkid == DMU_BONUS_BLKID) 2781e57a022bSJustin T. Gibbs found_db = dbuf_find_bonus(os, obj); 2782e57a022bSJustin T. Gibbs else 2783e57a022bSJustin T. Gibbs found_db = dbuf_find(os, obj, 0, blkid); 2784e57a022bSJustin T. Gibbs 2785e57a022bSJustin T. Gibbs if (found_db != NULL) { 2786e57a022bSJustin T. Gibbs if (db == found_db && dbuf_refcount(db) > db->db_dirtycnt) { 2787e914ace2STim Schumacher (void) zfs_refcount_add(&db->db_holds, tag); 2788e57a022bSJustin T. Gibbs result = B_TRUE; 2789e57a022bSJustin T. Gibbs } 2790e57a022bSJustin T. Gibbs mutex_exit(&db->db_mtx); 2791e57a022bSJustin T. Gibbs } 2792e57a022bSJustin T. Gibbs return (result); 2793e57a022bSJustin T. Gibbs } 2794e57a022bSJustin T. Gibbs 2795744947dcSTom Erickson /* 2796744947dcSTom Erickson * If you call dbuf_rele() you had better not be referencing the dnode handle 2797744947dcSTom Erickson * unless you have some other direct or indirect hold on the dnode. (An indirect 2798744947dcSTom Erickson * hold is a hold on one of the dnode's dbufs, including the bonus buffer.) 2799744947dcSTom Erickson * Without that, the dbuf_rele() could lead to a dnode_rele() followed by the 2800744947dcSTom Erickson * dnode's parent dbuf evicting its dnode handles. 2801744947dcSTom Erickson */ 2802fa9e4066Sahrens void 2803ea8dc4b6Seschrock dbuf_rele(dmu_buf_impl_t *db, void *tag) 2804fa9e4066Sahrens { 2805b24ab676SJeff Bonwick mutex_enter(&db->db_mtx); 2806c2919acbSMatthew Ahrens dbuf_rele_and_unlock(db, tag, B_FALSE); 2807b24ab676SJeff Bonwick } 2808b24ab676SJeff Bonwick 280943466aaeSMax Grossman void 281043466aaeSMax Grossman dmu_buf_rele(dmu_buf_t *db, void *tag) 281143466aaeSMax Grossman { 281243466aaeSMax Grossman dbuf_rele((dmu_buf_impl_t *)db, tag); 281343466aaeSMax Grossman } 281443466aaeSMax Grossman 2815b24ab676SJeff Bonwick /* 2816b24ab676SJeff Bonwick * dbuf_rele() for an already-locked dbuf. This is necessary to allow 2817c2919acbSMatthew Ahrens * db_dirtycnt and db_holds to be updated atomically. The 'evicting' 2818c2919acbSMatthew Ahrens * argument should be set if we are already in the dbuf-evicting code 2819c2919acbSMatthew Ahrens * path, in which case we don't want to recursively evict. This allows us to 2820c2919acbSMatthew Ahrens * avoid deeply nested stacks that would have a call flow similar to this: 2821c2919acbSMatthew Ahrens * 2822c2919acbSMatthew Ahrens * dbuf_rele()-->dbuf_rele_and_unlock()-->dbuf_evict_notify() 2823c2919acbSMatthew Ahrens * ^ | 2824c2919acbSMatthew Ahrens * | | 2825c2919acbSMatthew Ahrens * +-----dbuf_destroy()<--dbuf_evict_one()<--------+ 2826c2919acbSMatthew Ahrens * 2827b24ab676SJeff Bonwick */ 2828b24ab676SJeff Bonwick void 2829c2919acbSMatthew Ahrens dbuf_rele_and_unlock(dmu_buf_impl_t *db, void *tag, boolean_t evicting) 2830b24ab676SJeff Bonwick { 2831fa9e4066Sahrens int64_t holds; 2832fa9e4066Sahrens 2833b24ab676SJeff Bonwick ASSERT(MUTEX_HELD(&db->db_mtx)); 28349c9dc39aSek110237 DBUF_VERIFY(db); 2835fa9e4066Sahrens 2836744947dcSTom Erickson /* 2837744947dcSTom Erickson * Remove the reference to the dbuf before removing its hold on the 2838744947dcSTom Erickson * dnode so we can guarantee in dnode_move() that a referenced bonus 2839744947dcSTom Erickson * buffer has a corresponding dnode hold. 2840744947dcSTom Erickson */ 2841e914ace2STim Schumacher holds = zfs_refcount_remove(&db->db_holds, tag); 2842ea8dc4b6Seschrock ASSERT(holds >= 0); 2843fa9e4066Sahrens 2844c717a561Smaybee /* 2845c717a561Smaybee * We can't freeze indirects if there is a possibility that they 2846c717a561Smaybee * may be modified in the current syncing context. 2847c717a561Smaybee */ 2848dcbf3bd6SGeorge Wilson if (db->db_buf != NULL && 2849dcbf3bd6SGeorge Wilson holds == (db->db_level == 0 ? db->db_dirtycnt : 0)) { 28506b4acc8bSahrens arc_buf_freeze(db->db_buf); 2851dcbf3bd6SGeorge Wilson } 28526b4acc8bSahrens 2853fa9e4066Sahrens if (holds == db->db_dirtycnt && 2854d2058105SJustin T. Gibbs db->db_level == 0 && db->db_user_immediate_evict) 2855fa9e4066Sahrens dbuf_evict_user(db); 2856ea8dc4b6Seschrock 2857ea8dc4b6Seschrock if (holds == 0) { 28580a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 2859cd485b49SJustin T. Gibbs dnode_t *dn; 2860d2058105SJustin T. Gibbs boolean_t evict_dbuf = db->db_pending_evict; 2861cd485b49SJustin T. Gibbs 2862cd485b49SJustin T. Gibbs /* 2863cd485b49SJustin T. Gibbs * If the dnode moves here, we cannot cross this 2864cd485b49SJustin T. Gibbs * barrier until the move completes. 2865cd485b49SJustin T. Gibbs */ 2866cd485b49SJustin T. Gibbs DB_DNODE_ENTER(db); 2867cd485b49SJustin T. Gibbs 2868cd485b49SJustin T. Gibbs dn = DB_DNODE(db); 2869cd485b49SJustin T. Gibbs atomic_dec_32(&dn->dn_dbufs_count); 2870cd485b49SJustin T. Gibbs 2871cd485b49SJustin T. Gibbs /* 2872cd485b49SJustin T. Gibbs * Decrementing the dbuf count means that the bonus 2873cd485b49SJustin T. Gibbs * buffer's dnode hold is no longer discounted in 2874cd485b49SJustin T. Gibbs * dnode_move(). The dnode cannot move until after 2875d2058105SJustin T. Gibbs * the dnode_rele() below. 2876cd485b49SJustin T. Gibbs */ 2877cd485b49SJustin T. Gibbs DB_DNODE_EXIT(db); 2878cd485b49SJustin T. Gibbs 2879cd485b49SJustin T. Gibbs /* 2880cd485b49SJustin T. Gibbs * Do not reference db after its lock is dropped. 2881cd485b49SJustin T. Gibbs * Another thread may evict it. 2882cd485b49SJustin T. Gibbs */ 2883ea8dc4b6Seschrock mutex_exit(&db->db_mtx); 2884744947dcSTom Erickson 2885d2058105SJustin T. Gibbs if (evict_dbuf) 2886cd485b49SJustin T. Gibbs dnode_evict_bonus(dn); 2887d2058105SJustin T. Gibbs 2888d2058105SJustin T. Gibbs dnode_rele(dn, db); 2889ea8dc4b6Seschrock } else if (db->db_buf == NULL) { 2890ea8dc4b6Seschrock /* 2891ea8dc4b6Seschrock * This is a special case: we never associated this 2892ea8dc4b6Seschrock * dbuf with any data allocated from the ARC. 2893ea8dc4b6Seschrock */ 289482c9918fSTim Haley ASSERT(db->db_state == DB_UNCACHED || 289582c9918fSTim Haley db->db_state == DB_NOFILL); 2896dcbf3bd6SGeorge Wilson dbuf_destroy(db); 2897ea8dc4b6Seschrock } else if (arc_released(db->db_buf)) { 2898ea8dc4b6Seschrock /* 2899ea8dc4b6Seschrock * This dbuf has anonymous data associated with it. 2900ea8dc4b6Seschrock */ 2901dcbf3bd6SGeorge Wilson dbuf_destroy(db); 2902ea8dc4b6Seschrock } else { 2903dcbf3bd6SGeorge Wilson boolean_t do_arc_evict = B_FALSE; 2904dcbf3bd6SGeorge Wilson blkptr_t bp; 2905dcbf3bd6SGeorge Wilson spa_t *spa = dmu_objset_spa(db->db_objset); 29069253d63dSGeorge Wilson 2907dcbf3bd6SGeorge Wilson if (!DBUF_IS_CACHEABLE(db) && 2908dcbf3bd6SGeorge Wilson db->db_blkptr != NULL && 2909bbfa8ea8SMatthew Ahrens !BP_IS_HOLE(db->db_blkptr) && 2910bbfa8ea8SMatthew Ahrens !BP_IS_EMBEDDED(db->db_blkptr)) { 2911dcbf3bd6SGeorge Wilson do_arc_evict = B_TRUE; 2912dcbf3bd6SGeorge Wilson bp = *db->db_blkptr; 2913dcbf3bd6SGeorge Wilson } 2914dcbf3bd6SGeorge Wilson 2915dcbf3bd6SGeorge Wilson if (!DBUF_IS_CACHEABLE(db) || 2916dcbf3bd6SGeorge Wilson db->db_pending_evict) { 2917dcbf3bd6SGeorge Wilson dbuf_destroy(db); 2918dcbf3bd6SGeorge Wilson } else if (!multilist_link_active(&db->db_cache_link)) { 2919adb52d92SMatthew Ahrens ASSERT3U(db->db_caching_status, ==, 2920adb52d92SMatthew Ahrens DB_NO_CACHE); 2921adb52d92SMatthew Ahrens 2922adb52d92SMatthew Ahrens dbuf_cached_state_t dcs = 2923adb52d92SMatthew Ahrens dbuf_include_in_metadata_cache(db) ? 2924adb52d92SMatthew Ahrens DB_DBUF_METADATA_CACHE : DB_DBUF_CACHE; 2925adb52d92SMatthew Ahrens db->db_caching_status = dcs; 2926adb52d92SMatthew Ahrens 2927adb52d92SMatthew Ahrens multilist_insert(dbuf_caches[dcs].cache, db); 2928e914ace2STim Schumacher (void) zfs_refcount_add_many( 2929e914ace2STim Schumacher &dbuf_caches[dcs].size, db->db.db_size, db); 2930dcbf3bd6SGeorge Wilson mutex_exit(&db->db_mtx); 2931dcbf3bd6SGeorge Wilson 2932c2919acbSMatthew Ahrens if (db->db_caching_status == DB_DBUF_CACHE && 2933c2919acbSMatthew Ahrens !evicting) { 2934dcbf3bd6SGeorge Wilson dbuf_evict_notify(); 2935dcbf3bd6SGeorge Wilson } 2936adb52d92SMatthew Ahrens } 2937dcbf3bd6SGeorge Wilson 2938dcbf3bd6SGeorge Wilson if (do_arc_evict) 2939bbfa8ea8SMatthew Ahrens arc_freed(spa, &bp); 2940bbfa8ea8SMatthew Ahrens } 2941ea8dc4b6Seschrock } else { 2942ea8dc4b6Seschrock mutex_exit(&db->db_mtx); 2943fa9e4066Sahrens } 2944dcbf3bd6SGeorge Wilson 2945fa9e4066Sahrens } 2946fa9e4066Sahrens 2947fa9e4066Sahrens #pragma weak dmu_buf_refcount = dbuf_refcount 2948fa9e4066Sahrens uint64_t 2949fa9e4066Sahrens dbuf_refcount(dmu_buf_impl_t *db) 2950fa9e4066Sahrens { 2951e914ace2STim Schumacher return (zfs_refcount_count(&db->db_holds)); 2952fa9e4066Sahrens } 2953fa9e4066Sahrens 2954fa9e4066Sahrens void * 2955bc9014e6SJustin Gibbs dmu_buf_replace_user(dmu_buf_t *db_fake, dmu_buf_user_t *old_user, 2956bc9014e6SJustin Gibbs dmu_buf_user_t *new_user) 2957fa9e4066Sahrens { 2958bc9014e6SJustin Gibbs dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 2959bc9014e6SJustin Gibbs 2960bc9014e6SJustin Gibbs mutex_enter(&db->db_mtx); 2961bc9014e6SJustin Gibbs dbuf_verify_user(db, DBVU_NOT_EVICTING); 2962bc9014e6SJustin Gibbs if (db->db_user == old_user) 2963bc9014e6SJustin Gibbs db->db_user = new_user; 2964bc9014e6SJustin Gibbs else 2965bc9014e6SJustin Gibbs old_user = db->db_user; 2966bc9014e6SJustin Gibbs dbuf_verify_user(db, DBVU_NOT_EVICTING); 2967bc9014e6SJustin Gibbs mutex_exit(&db->db_mtx); 2968bc9014e6SJustin Gibbs 2969bc9014e6SJustin Gibbs return (old_user); 2970fa9e4066Sahrens } 2971fa9e4066Sahrens 2972fa9e4066Sahrens void * 2973bc9014e6SJustin Gibbs dmu_buf_set_user(dmu_buf_t *db_fake, dmu_buf_user_t *user) 2974bc9014e6SJustin Gibbs { 2975bc9014e6SJustin Gibbs return (dmu_buf_replace_user(db_fake, NULL, user)); 2976bc9014e6SJustin Gibbs } 2977bc9014e6SJustin Gibbs 2978bc9014e6SJustin Gibbs void * 2979bc9014e6SJustin Gibbs dmu_buf_set_user_ie(dmu_buf_t *db_fake, dmu_buf_user_t *user) 2980fa9e4066Sahrens { 2981fa9e4066Sahrens dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 2982fa9e4066Sahrens 2983d2058105SJustin T. Gibbs db->db_user_immediate_evict = TRUE; 2984bc9014e6SJustin Gibbs return (dmu_buf_set_user(db_fake, user)); 2985fa9e4066Sahrens } 2986fa9e4066Sahrens 2987fa9e4066Sahrens void * 2988bc9014e6SJustin Gibbs dmu_buf_remove_user(dmu_buf_t *db_fake, dmu_buf_user_t *user) 2989fa9e4066Sahrens { 2990bc9014e6SJustin Gibbs return (dmu_buf_replace_user(db_fake, user, NULL)); 2991fa9e4066Sahrens } 2992fa9e4066Sahrens 2993fa9e4066Sahrens void * 2994fa9e4066Sahrens dmu_buf_get_user(dmu_buf_t *db_fake) 2995fa9e4066Sahrens { 2996fa9e4066Sahrens dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 2997fa9e4066Sahrens 2998bc9014e6SJustin Gibbs dbuf_verify_user(db, DBVU_NOT_EVICTING); 2999bc9014e6SJustin Gibbs return (db->db_user); 3000bc9014e6SJustin Gibbs } 3001bc9014e6SJustin Gibbs 3002bc9014e6SJustin Gibbs void 3003bc9014e6SJustin Gibbs dmu_buf_user_evict_wait() 3004bc9014e6SJustin Gibbs { 3005bc9014e6SJustin Gibbs taskq_wait(dbu_evict_taskq); 3006fa9e4066Sahrens } 3007fa9e4066Sahrens 300880901aeaSGeorge Wilson blkptr_t * 300980901aeaSGeorge Wilson dmu_buf_get_blkptr(dmu_buf_t *db) 301080901aeaSGeorge Wilson { 301180901aeaSGeorge Wilson dmu_buf_impl_t *dbi = (dmu_buf_impl_t *)db; 301280901aeaSGeorge Wilson return (dbi->db_blkptr); 301380901aeaSGeorge Wilson } 301480901aeaSGeorge Wilson 3015ae972795SMatthew Ahrens objset_t * 3016ae972795SMatthew Ahrens dmu_buf_get_objset(dmu_buf_t *db) 3017ae972795SMatthew Ahrens { 3018ae972795SMatthew Ahrens dmu_buf_impl_t *dbi = (dmu_buf_impl_t *)db; 3019ae972795SMatthew Ahrens return (dbi->db_objset); 3020ae972795SMatthew Ahrens } 3021ae972795SMatthew Ahrens 302279d72832SMatthew Ahrens dnode_t * 302379d72832SMatthew Ahrens dmu_buf_dnode_enter(dmu_buf_t *db) 302479d72832SMatthew Ahrens { 302579d72832SMatthew Ahrens dmu_buf_impl_t *dbi = (dmu_buf_impl_t *)db; 302679d72832SMatthew Ahrens DB_DNODE_ENTER(dbi); 302779d72832SMatthew Ahrens return (DB_DNODE(dbi)); 302879d72832SMatthew Ahrens } 302979d72832SMatthew Ahrens 303079d72832SMatthew Ahrens void 303179d72832SMatthew Ahrens dmu_buf_dnode_exit(dmu_buf_t *db) 303279d72832SMatthew Ahrens { 303379d72832SMatthew Ahrens dmu_buf_impl_t *dbi = (dmu_buf_impl_t *)db; 303479d72832SMatthew Ahrens DB_DNODE_EXIT(dbi); 303579d72832SMatthew Ahrens } 303679d72832SMatthew Ahrens 3037c717a561Smaybee static void 3038c717a561Smaybee dbuf_check_blkptr(dnode_t *dn, dmu_buf_impl_t *db) 3039fa9e4066Sahrens { 3040c717a561Smaybee /* ASSERT(dmu_tx_is_syncing(tx) */ 3041c717a561Smaybee ASSERT(MUTEX_HELD(&db->db_mtx)); 3042c717a561Smaybee 3043c717a561Smaybee if (db->db_blkptr != NULL) 3044c717a561Smaybee return; 3045c717a561Smaybee 30460a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) { 304754811da5SToomas Soome db->db_blkptr = DN_SPILL_BLKPTR(dn->dn_phys); 30480a586ceaSMark Shellenbaum BP_ZERO(db->db_blkptr); 30490a586ceaSMark Shellenbaum return; 30500a586ceaSMark Shellenbaum } 3051c717a561Smaybee if (db->db_level == dn->dn_phys->dn_nlevels-1) { 3052c717a561Smaybee /* 3053c717a561Smaybee * This buffer was allocated at a time when there was 3054c717a561Smaybee * no available blkptrs from the dnode, or it was 3055c717a561Smaybee * inappropriate to hook it in (i.e., nlevels mis-match). 3056c717a561Smaybee */ 3057c717a561Smaybee ASSERT(db->db_blkid < dn->dn_phys->dn_nblkptr); 3058c717a561Smaybee ASSERT(db->db_parent == NULL); 3059c717a561Smaybee db->db_parent = dn->dn_dbuf; 3060c717a561Smaybee db->db_blkptr = &dn->dn_phys->dn_blkptr[db->db_blkid]; 3061c717a561Smaybee DBUF_VERIFY(db); 3062c717a561Smaybee } else { 3063c717a561Smaybee dmu_buf_impl_t *parent = db->db_parent; 3064c717a561Smaybee int epbs = dn->dn_phys->dn_indblkshift - SPA_BLKPTRSHIFT; 3065c717a561Smaybee 3066c717a561Smaybee ASSERT(dn->dn_phys->dn_nlevels > 1); 3067c717a561Smaybee if (parent == NULL) { 3068c717a561Smaybee mutex_exit(&db->db_mtx); 3069c717a561Smaybee rw_enter(&dn->dn_struct_rwlock, RW_READER); 3070a2cdcdd2SPaul Dagnelie parent = dbuf_hold_level(dn, db->db_level + 1, 3071a2cdcdd2SPaul Dagnelie db->db_blkid >> epbs, db); 3072c717a561Smaybee rw_exit(&dn->dn_struct_rwlock); 3073c717a561Smaybee mutex_enter(&db->db_mtx); 3074c717a561Smaybee db->db_parent = parent; 3075c717a561Smaybee } 3076c717a561Smaybee db->db_blkptr = (blkptr_t *)parent->db.db_data + 3077c717a561Smaybee (db->db_blkid & ((1ULL << epbs) - 1)); 3078c717a561Smaybee DBUF_VERIFY(db); 3079c717a561Smaybee } 3080c717a561Smaybee } 3081c717a561Smaybee 3082c717a561Smaybee static void 3083c717a561Smaybee dbuf_sync_indirect(dbuf_dirty_record_t *dr, dmu_tx_t *tx) 3084c717a561Smaybee { 3085c717a561Smaybee dmu_buf_impl_t *db = dr->dr_dbuf; 3086744947dcSTom Erickson dnode_t *dn; 3087c717a561Smaybee zio_t *zio; 3088c717a561Smaybee 3089c717a561Smaybee ASSERT(dmu_tx_is_syncing(tx)); 3090c717a561Smaybee 3091c717a561Smaybee dprintf_dbuf_bp(db, db->db_blkptr, "blkptr=%p", db->db_blkptr); 3092c717a561Smaybee 3093c717a561Smaybee mutex_enter(&db->db_mtx); 3094c717a561Smaybee 3095c717a561Smaybee ASSERT(db->db_level > 0); 3096c717a561Smaybee DBUF_VERIFY(db); 3097c717a561Smaybee 30983e30c24aSWill Andrews /* Read the block if it hasn't been read yet. */ 3099c717a561Smaybee if (db->db_buf == NULL) { 3100c717a561Smaybee mutex_exit(&db->db_mtx); 3101c717a561Smaybee (void) dbuf_read(db, NULL, DB_RF_MUST_SUCCEED); 3102c717a561Smaybee mutex_enter(&db->db_mtx); 3103c717a561Smaybee } 3104c717a561Smaybee ASSERT3U(db->db_state, ==, DB_CACHED); 3105c717a561Smaybee ASSERT(db->db_buf != NULL); 3106c717a561Smaybee 3107744947dcSTom Erickson DB_DNODE_ENTER(db); 3108744947dcSTom Erickson dn = DB_DNODE(db); 31093e30c24aSWill Andrews /* Indirect block size must match what the dnode thinks it is. */ 3110744947dcSTom Erickson ASSERT3U(db->db.db_size, ==, 1<<dn->dn_phys->dn_indblkshift); 3111c717a561Smaybee dbuf_check_blkptr(dn, db); 3112744947dcSTom Erickson DB_DNODE_EXIT(db); 3113c717a561Smaybee 31143e30c24aSWill Andrews /* Provide the pending dirty record to child dbufs */ 3115c717a561Smaybee db->db_data_pending = dr; 3116c717a561Smaybee 3117af2c4821Smaybee mutex_exit(&db->db_mtx); 31185cabbc6bSPrashanth Sreenivasa 3119088f3894Sahrens dbuf_write(dr, db->db_buf, tx); 3120c717a561Smaybee 3121c717a561Smaybee zio = dr->dr_zio; 3122c717a561Smaybee mutex_enter(&dr->dt.di.dr_mtx); 312346e1baa6SMatthew Ahrens dbuf_sync_list(&dr->dt.di.dr_children, db->db_level - 1, tx); 3124c717a561Smaybee ASSERT(list_head(&dr->dt.di.dr_children) == NULL); 3125c717a561Smaybee mutex_exit(&dr->dt.di.dr_mtx); 3126c717a561Smaybee zio_nowait(zio); 3127c717a561Smaybee } 3128c717a561Smaybee 3129c717a561Smaybee static void 3130c717a561Smaybee dbuf_sync_leaf(dbuf_dirty_record_t *dr, dmu_tx_t *tx) 3131c717a561Smaybee { 3132c717a561Smaybee arc_buf_t **datap = &dr->dt.dl.dr_data; 3133c717a561Smaybee dmu_buf_impl_t *db = dr->dr_dbuf; 3134744947dcSTom Erickson dnode_t *dn; 3135744947dcSTom Erickson objset_t *os; 3136c717a561Smaybee uint64_t txg = tx->tx_txg; 3137fa9e4066Sahrens 3138fa9e4066Sahrens ASSERT(dmu_tx_is_syncing(tx)); 3139fa9e4066Sahrens 3140fa9e4066Sahrens dprintf_dbuf_bp(db, db->db_blkptr, "blkptr=%p", db->db_blkptr); 3141fa9e4066Sahrens 3142fa9e4066Sahrens mutex_enter(&db->db_mtx); 3143fa9e4066Sahrens /* 3144fa9e4066Sahrens * To be synced, we must be dirtied. But we 3145fa9e4066Sahrens * might have been freed after the dirty. 3146fa9e4066Sahrens */ 3147fa9e4066Sahrens if (db->db_state == DB_UNCACHED) { 3148fa9e4066Sahrens /* This buffer has been freed since it was dirtied */ 3149fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 3150fa9e4066Sahrens } else if (db->db_state == DB_FILL) { 3151fa9e4066Sahrens /* This buffer was freed and is now being re-filled */ 3152c717a561Smaybee ASSERT(db->db.db_data != dr->dt.dl.dr_data); 3153fa9e4066Sahrens } else { 315482c9918fSTim Haley ASSERT(db->db_state == DB_CACHED || db->db_state == DB_NOFILL); 3155fa9e4066Sahrens } 31569c9dc39aSek110237 DBUF_VERIFY(db); 3157fa9e4066Sahrens 3158744947dcSTom Erickson DB_DNODE_ENTER(db); 3159744947dcSTom Erickson dn = DB_DNODE(db); 3160744947dcSTom Erickson 31610a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) { 31620a586ceaSMark Shellenbaum mutex_enter(&dn->dn_mtx); 31630a586ceaSMark Shellenbaum dn->dn_phys->dn_flags |= DNODE_FLAG_SPILL_BLKPTR; 31640a586ceaSMark Shellenbaum mutex_exit(&dn->dn_mtx); 31650a586ceaSMark Shellenbaum } 31660a586ceaSMark Shellenbaum 3167fa9e4066Sahrens /* 3168c717a561Smaybee * If this is a bonus buffer, simply copy the bonus data into the 3169c717a561Smaybee * dnode. It will be written out when the dnode is synced (and it 3170c717a561Smaybee * will be synced, since it must have been dirty for dbuf_sync to 3171c717a561Smaybee * be called). 3172fa9e4066Sahrens */ 31730a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 3174c717a561Smaybee dbuf_dirty_record_t **drp; 31751934e92fSmaybee 3176ea8dc4b6Seschrock ASSERT(*datap != NULL); 3177fb09f5aaSMadhav Suresh ASSERT0(db->db_level); 317854811da5SToomas Soome ASSERT3U(DN_MAX_BONUS_LEN(dn->dn_phys), <=, 317954811da5SToomas Soome DN_SLOTS_TO_BONUSLEN(dn->dn_phys->dn_extra_slots + 1)); 318054811da5SToomas Soome bcopy(*datap, DN_BONUS(dn->dn_phys), 318154811da5SToomas Soome DN_MAX_BONUS_LEN(dn->dn_phys)); 3182744947dcSTom Erickson DB_DNODE_EXIT(db); 3183744947dcSTom Erickson 31840e8c6158Smaybee if (*datap != db->db.db_data) { 318554811da5SToomas Soome int slots = DB_DNODE(db)->dn_num_slots; 318654811da5SToomas Soome int bonuslen = DN_SLOTS_TO_BONUSLEN(slots); 318754811da5SToomas Soome zio_buf_free(*datap, bonuslen); 318854811da5SToomas Soome arc_space_return(bonuslen, ARC_SPACE_BONUS); 31890e8c6158Smaybee } 3190ea8dc4b6Seschrock db->db_data_pending = NULL; 3191c717a561Smaybee drp = &db->db_last_dirty; 3192c717a561Smaybee while (*drp != dr) 3193c717a561Smaybee drp = &(*drp)->dr_next; 319417f17c2dSbonwick ASSERT(dr->dr_next == NULL); 3195b24ab676SJeff Bonwick ASSERT(dr->dr_dbuf == db); 319617f17c2dSbonwick *drp = dr->dr_next; 3197c717a561Smaybee kmem_free(dr, sizeof (dbuf_dirty_record_t)); 3198ea8dc4b6Seschrock ASSERT(db->db_dirtycnt > 0); 3199ea8dc4b6Seschrock db->db_dirtycnt -= 1; 3200c2919acbSMatthew Ahrens dbuf_rele_and_unlock(db, (void *)(uintptr_t)txg, B_FALSE); 3201ea8dc4b6Seschrock return; 3202ea8dc4b6Seschrock } 3203ea8dc4b6Seschrock 3204744947dcSTom Erickson os = dn->dn_objset; 3205744947dcSTom Erickson 3206c5c6ffa0Smaybee /* 3207f82bfe17Sgw25295 * This function may have dropped the db_mtx lock allowing a dmu_sync 3208f82bfe17Sgw25295 * operation to sneak in. As a result, we need to ensure that we 3209f82bfe17Sgw25295 * don't check the dr_override_state until we have returned from 3210f82bfe17Sgw25295 * dbuf_check_blkptr. 3211f82bfe17Sgw25295 */ 3212f82bfe17Sgw25295 dbuf_check_blkptr(dn, db); 3213f82bfe17Sgw25295 3214f82bfe17Sgw25295 /* 3215744947dcSTom Erickson * If this buffer is in the middle of an immediate write, 3216c717a561Smaybee * wait for the synchronous IO to complete. 3217c5c6ffa0Smaybee */ 3218c717a561Smaybee while (dr->dt.dl.dr_override_state == DR_IN_DMU_SYNC) { 3219c5c6ffa0Smaybee ASSERT(dn->dn_object != DMU_META_DNODE_OBJECT); 3220c5c6ffa0Smaybee cv_wait(&db->db_changed, &db->db_mtx); 3221c717a561Smaybee ASSERT(dr->dt.dl.dr_override_state != DR_NOT_OVERRIDDEN); 3222c5c6ffa0Smaybee } 3223c717a561Smaybee 3224ab69d62fSMatthew Ahrens if (db->db_state != DB_NOFILL && 3225ab69d62fSMatthew Ahrens dn->dn_object != DMU_META_DNODE_OBJECT && 3226e914ace2STim Schumacher zfs_refcount_count(&db->db_holds) > 1 && 3227b24ab676SJeff Bonwick dr->dt.dl.dr_override_state != DR_OVERRIDDEN && 3228ab69d62fSMatthew Ahrens *datap == db->db_buf) { 3229fa9e4066Sahrens /* 323082c9918fSTim Haley * If this buffer is currently "in use" (i.e., there 323182c9918fSTim Haley * are active holds and db_data still references it), 323282c9918fSTim Haley * then make a copy before we start the write so that 323382c9918fSTim Haley * any modifications from the open txg will not leak 323482c9918fSTim Haley * into this write. 3235fa9e4066Sahrens * 323682c9918fSTim Haley * NOTE: this copy does not need to be made for 323782c9918fSTim Haley * objects only modified in the syncing context (e.g. 323882c9918fSTim Haley * DNONE_DNODE blocks). 3239fa9e4066Sahrens */ 32405602294fSDan Kimmel int psize = arc_buf_size(*datap); 3241ab69d62fSMatthew Ahrens arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 32425602294fSDan Kimmel enum zio_compress compress_type = arc_get_compression(*datap); 32435602294fSDan Kimmel 32445602294fSDan Kimmel if (compress_type == ZIO_COMPRESS_OFF) { 32455602294fSDan Kimmel *datap = arc_alloc_buf(os->os_spa, db, type, psize); 32465602294fSDan Kimmel } else { 32475602294fSDan Kimmel ASSERT3U(type, ==, ARC_BUFC_DATA); 32485602294fSDan Kimmel int lsize = arc_buf_lsize(*datap); 32495602294fSDan Kimmel *datap = arc_alloc_compressed_buf(os->os_spa, db, 32505602294fSDan Kimmel psize, lsize, compress_type); 32515602294fSDan Kimmel } 32525602294fSDan Kimmel bcopy(db->db.db_data, (*datap)->b_data, psize); 3253fa9e4066Sahrens } 3254c717a561Smaybee db->db_data_pending = dr; 3255fa9e4066Sahrens 3256fa9e4066Sahrens mutex_exit(&db->db_mtx); 3257fa9e4066Sahrens 3258088f3894Sahrens dbuf_write(dr, *datap, tx); 3259c717a561Smaybee 3260c717a561Smaybee ASSERT(!list_link_active(&dr->dr_dirty_node)); 3261744947dcSTom Erickson if (dn->dn_object == DMU_META_DNODE_OBJECT) { 3262c717a561Smaybee list_insert_tail(&dn->dn_dirty_records[txg&TXG_MASK], dr); 3263744947dcSTom Erickson DB_DNODE_EXIT(db); 3264744947dcSTom Erickson } else { 3265744947dcSTom Erickson /* 3266744947dcSTom Erickson * Although zio_nowait() does not "wait for an IO", it does 3267744947dcSTom Erickson * initiate the IO. If this is an empty write it seems plausible 3268744947dcSTom Erickson * that the IO could actually be completed before the nowait 3269744947dcSTom Erickson * returns. We need to DB_DNODE_EXIT() first in case 3270744947dcSTom Erickson * zio_nowait() invalidates the dbuf. 3271744947dcSTom Erickson */ 3272744947dcSTom Erickson DB_DNODE_EXIT(db); 3273c717a561Smaybee zio_nowait(dr->dr_zio); 3274fa9e4066Sahrens } 3275744947dcSTom Erickson } 3276c717a561Smaybee 3277c717a561Smaybee void 327846e1baa6SMatthew Ahrens dbuf_sync_list(list_t *list, int level, dmu_tx_t *tx) 3279c717a561Smaybee { 3280c717a561Smaybee dbuf_dirty_record_t *dr; 3281c717a561Smaybee 3282c717a561Smaybee while (dr = list_head(list)) { 3283c717a561Smaybee if (dr->dr_zio != NULL) { 3284c717a561Smaybee /* 3285c717a561Smaybee * If we find an already initialized zio then we 3286c717a561Smaybee * are processing the meta-dnode, and we have finished. 3287c717a561Smaybee * The dbufs for all dnodes are put back on the list 3288c717a561Smaybee * during processing, so that we can zio_wait() 3289c717a561Smaybee * these IOs after initiating all child IOs. 3290c717a561Smaybee */ 3291c717a561Smaybee ASSERT3U(dr->dr_dbuf->db.db_object, ==, 3292c717a561Smaybee DMU_META_DNODE_OBJECT); 3293c717a561Smaybee break; 3294fa9e4066Sahrens } 329546e1baa6SMatthew Ahrens if (dr->dr_dbuf->db_blkid != DMU_BONUS_BLKID && 329646e1baa6SMatthew Ahrens dr->dr_dbuf->db_blkid != DMU_SPILL_BLKID) { 329746e1baa6SMatthew Ahrens VERIFY3U(dr->dr_dbuf->db_level, ==, level); 329846e1baa6SMatthew Ahrens } 3299c717a561Smaybee list_remove(list, dr); 3300c717a561Smaybee if (dr->dr_dbuf->db_level > 0) 3301c717a561Smaybee dbuf_sync_indirect(dr, tx); 3302c717a561Smaybee else 3303c717a561Smaybee dbuf_sync_leaf(dr, tx); 3304c717a561Smaybee } 3305c717a561Smaybee } 3306c717a561Smaybee 3307fa9e4066Sahrens /* ARGSUSED */ 3308fa9e4066Sahrens static void 3309c717a561Smaybee dbuf_write_ready(zio_t *zio, arc_buf_t *buf, void *vdb) 3310fa9e4066Sahrens { 3311fa9e4066Sahrens dmu_buf_impl_t *db = vdb; 3312744947dcSTom Erickson dnode_t *dn; 3313e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 3314c717a561Smaybee blkptr_t *bp_orig = &zio->io_bp_orig; 3315b24ab676SJeff Bonwick spa_t *spa = zio->io_spa; 3316b24ab676SJeff Bonwick int64_t delta; 3317fa9e4066Sahrens uint64_t fill = 0; 3318b24ab676SJeff Bonwick int i; 3319fa9e4066Sahrens 332011ceac77SAlex Reece ASSERT3P(db->db_blkptr, !=, NULL); 332111ceac77SAlex Reece ASSERT3P(&db->db_data_pending->dr_bp_copy, ==, bp); 3322e14bb325SJeff Bonwick 3323744947dcSTom Erickson DB_DNODE_ENTER(db); 3324744947dcSTom Erickson dn = DB_DNODE(db); 3325b24ab676SJeff Bonwick delta = bp_get_dsize_sync(spa, bp) - bp_get_dsize_sync(spa, bp_orig); 3326b24ab676SJeff Bonwick dnode_diduse_space(dn, delta - zio->io_prev_space_delta); 3327b24ab676SJeff Bonwick zio->io_prev_space_delta = delta; 3328fa9e4066Sahrens 332943466aaeSMax Grossman if (bp->blk_birth != 0) { 33300a586ceaSMark Shellenbaum ASSERT((db->db_blkid != DMU_SPILL_BLKID && 33310a586ceaSMark Shellenbaum BP_GET_TYPE(bp) == dn->dn_type) || 33320a586ceaSMark Shellenbaum (db->db_blkid == DMU_SPILL_BLKID && 33335d7b4d43SMatthew Ahrens BP_GET_TYPE(bp) == dn->dn_bonustype) || 33345d7b4d43SMatthew Ahrens BP_IS_EMBEDDED(bp)); 3335e14bb325SJeff Bonwick ASSERT(BP_GET_LEVEL(bp) == db->db_level); 333643466aaeSMax Grossman } 3337e14bb325SJeff Bonwick 3338fa9e4066Sahrens mutex_enter(&db->db_mtx); 3339fa9e4066Sahrens 33400a586ceaSMark Shellenbaum #ifdef ZFS_DEBUG 33410a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) { 33420a586ceaSMark Shellenbaum ASSERT(dn->dn_phys->dn_flags & DNODE_FLAG_SPILL_BLKPTR); 334311ceac77SAlex Reece ASSERT(!(BP_IS_HOLE(bp)) && 334454811da5SToomas Soome db->db_blkptr == DN_SPILL_BLKPTR(dn->dn_phys)); 33450a586ceaSMark Shellenbaum } 33460a586ceaSMark Shellenbaum #endif 33470a586ceaSMark Shellenbaum 3348fa9e4066Sahrens if (db->db_level == 0) { 3349fa9e4066Sahrens mutex_enter(&dn->dn_mtx); 33500a586ceaSMark Shellenbaum if (db->db_blkid > dn->dn_phys->dn_maxblkid && 33510a586ceaSMark Shellenbaum db->db_blkid != DMU_SPILL_BLKID) 3352fa9e4066Sahrens dn->dn_phys->dn_maxblkid = db->db_blkid; 3353fa9e4066Sahrens mutex_exit(&dn->dn_mtx); 3354fa9e4066Sahrens 3355fa9e4066Sahrens if (dn->dn_type == DMU_OT_DNODE) { 335654811da5SToomas Soome i = 0; 335754811da5SToomas Soome while (i < db->db.db_size) { 335854811da5SToomas Soome dnode_phys_t *dnp = 335954811da5SToomas Soome (void *)(((char *)db->db.db_data) + i); 336054811da5SToomas Soome 336154811da5SToomas Soome i += DNODE_MIN_SIZE; 336254811da5SToomas Soome if (dnp->dn_type != DMU_OT_NONE) { 3363fa9e4066Sahrens fill++; 336454811da5SToomas Soome i += dnp->dn_extra_slots * 336554811da5SToomas Soome DNODE_MIN_SIZE; 336654811da5SToomas Soome } 3367fa9e4066Sahrens } 3368fa9e4066Sahrens } else { 336943466aaeSMax Grossman if (BP_IS_HOLE(bp)) { 337043466aaeSMax Grossman fill = 0; 337143466aaeSMax Grossman } else { 3372fa9e4066Sahrens fill = 1; 3373fa9e4066Sahrens } 337443466aaeSMax Grossman } 3375fa9e4066Sahrens } else { 3376e14bb325SJeff Bonwick blkptr_t *ibp = db->db.db_data; 3377fa9e4066Sahrens ASSERT3U(db->db.db_size, ==, 1<<dn->dn_phys->dn_indblkshift); 3378e14bb325SJeff Bonwick for (i = db->db.db_size >> SPA_BLKPTRSHIFT; i > 0; i--, ibp++) { 3379e14bb325SJeff Bonwick if (BP_IS_HOLE(ibp)) 3380fa9e4066Sahrens continue; 33815d7b4d43SMatthew Ahrens fill += BP_GET_FILL(ibp); 3382fa9e4066Sahrens } 3383fa9e4066Sahrens } 3384744947dcSTom Erickson DB_DNODE_EXIT(db); 3385fa9e4066Sahrens 33865d7b4d43SMatthew Ahrens if (!BP_IS_EMBEDDED(bp)) 3387e14bb325SJeff Bonwick bp->blk_fill = fill; 3388fa9e4066Sahrens 3389fa9e4066Sahrens mutex_exit(&db->db_mtx); 339011ceac77SAlex Reece 339111ceac77SAlex Reece rw_enter(&dn->dn_struct_rwlock, RW_WRITER); 339211ceac77SAlex Reece *db->db_blkptr = *bp; 339311ceac77SAlex Reece rw_exit(&dn->dn_struct_rwlock); 3394fa9e4066Sahrens } 3395fa9e4066Sahrens 33968df0bcf0SPaul Dagnelie /* ARGSUSED */ 33978df0bcf0SPaul Dagnelie /* 33988df0bcf0SPaul Dagnelie * This function gets called just prior to running through the compression 33998df0bcf0SPaul Dagnelie * stage of the zio pipeline. If we're an indirect block comprised of only 34008df0bcf0SPaul Dagnelie * holes, then we want this indirect to be compressed away to a hole. In 34018df0bcf0SPaul Dagnelie * order to do that we must zero out any information about the holes that 34028df0bcf0SPaul Dagnelie * this indirect points to prior to before we try to compress it. 34038df0bcf0SPaul Dagnelie */ 34048df0bcf0SPaul Dagnelie static void 34058df0bcf0SPaul Dagnelie dbuf_write_children_ready(zio_t *zio, arc_buf_t *buf, void *vdb) 34068df0bcf0SPaul Dagnelie { 34078df0bcf0SPaul Dagnelie dmu_buf_impl_t *db = vdb; 34088df0bcf0SPaul Dagnelie dnode_t *dn; 34098df0bcf0SPaul Dagnelie blkptr_t *bp; 34101a01181fSGeorge Wilson unsigned int epbs, i; 34118df0bcf0SPaul Dagnelie 34128df0bcf0SPaul Dagnelie ASSERT3U(db->db_level, >, 0); 34138df0bcf0SPaul Dagnelie DB_DNODE_ENTER(db); 34148df0bcf0SPaul Dagnelie dn = DB_DNODE(db); 34158df0bcf0SPaul Dagnelie epbs = dn->dn_phys->dn_indblkshift - SPA_BLKPTRSHIFT; 34161a01181fSGeorge Wilson ASSERT3U(epbs, <, 31); 34178df0bcf0SPaul Dagnelie 34188df0bcf0SPaul Dagnelie /* Determine if all our children are holes */ 34198df0bcf0SPaul Dagnelie for (i = 0, bp = db->db.db_data; i < 1 << epbs; i++, bp++) { 34208df0bcf0SPaul Dagnelie if (!BP_IS_HOLE(bp)) 34218df0bcf0SPaul Dagnelie break; 34228df0bcf0SPaul Dagnelie } 34238df0bcf0SPaul Dagnelie 34248df0bcf0SPaul Dagnelie /* 34258df0bcf0SPaul Dagnelie * If all the children are holes, then zero them all out so that 34268df0bcf0SPaul Dagnelie * we may get compressed away. 34278df0bcf0SPaul Dagnelie */ 34288df0bcf0SPaul Dagnelie if (i == 1 << epbs) { 34291a01181fSGeorge Wilson /* 34301a01181fSGeorge Wilson * We only found holes. Grab the rwlock to prevent 34311a01181fSGeorge Wilson * anybody from reading the blocks we're about to 34321a01181fSGeorge Wilson * zero out. 34331a01181fSGeorge Wilson */ 34341a01181fSGeorge Wilson rw_enter(&dn->dn_struct_rwlock, RW_WRITER); 34358df0bcf0SPaul Dagnelie bzero(db->db.db_data, db->db.db_size); 34361a01181fSGeorge Wilson rw_exit(&dn->dn_struct_rwlock); 34378df0bcf0SPaul Dagnelie } 34388df0bcf0SPaul Dagnelie DB_DNODE_EXIT(db); 34398df0bcf0SPaul Dagnelie } 34408df0bcf0SPaul Dagnelie 344169962b56SMatthew Ahrens /* 344269962b56SMatthew Ahrens * The SPA will call this callback several times for each zio - once 344369962b56SMatthew Ahrens * for every physical child i/o (zio->io_phys_children times). This 344469962b56SMatthew Ahrens * allows the DMU to monitor the progress of each logical i/o. For example, 344569962b56SMatthew Ahrens * there may be 2 copies of an indirect block, or many fragments of a RAID-Z 344669962b56SMatthew Ahrens * block. There may be a long delay before all copies/fragments are completed, 344769962b56SMatthew Ahrens * so this callback allows us to retire dirty space gradually, as the physical 344869962b56SMatthew Ahrens * i/os complete. 344969962b56SMatthew Ahrens */ 345069962b56SMatthew Ahrens /* ARGSUSED */ 345169962b56SMatthew Ahrens static void 345269962b56SMatthew Ahrens dbuf_write_physdone(zio_t *zio, arc_buf_t *buf, void *arg) 345369962b56SMatthew Ahrens { 345469962b56SMatthew Ahrens dmu_buf_impl_t *db = arg; 345569962b56SMatthew Ahrens objset_t *os = db->db_objset; 345669962b56SMatthew Ahrens dsl_pool_t *dp = dmu_objset_pool(os); 345769962b56SMatthew Ahrens dbuf_dirty_record_t *dr; 345869962b56SMatthew Ahrens int delta = 0; 345969962b56SMatthew Ahrens 346069962b56SMatthew Ahrens dr = db->db_data_pending; 346169962b56SMatthew Ahrens ASSERT3U(dr->dr_txg, ==, zio->io_txg); 346269962b56SMatthew Ahrens 346369962b56SMatthew Ahrens /* 346469962b56SMatthew Ahrens * The callback will be called io_phys_children times. Retire one 346569962b56SMatthew Ahrens * portion of our dirty space each time we are called. Any rounding 346669962b56SMatthew Ahrens * error will be cleaned up by dsl_pool_sync()'s call to 346769962b56SMatthew Ahrens * dsl_pool_undirty_space(). 346869962b56SMatthew Ahrens */ 346969962b56SMatthew Ahrens delta = dr->dr_accounted / zio->io_phys_children; 347069962b56SMatthew Ahrens dsl_pool_undirty_space(dp, delta, zio->io_txg); 347169962b56SMatthew Ahrens } 347269962b56SMatthew Ahrens 3473c717a561Smaybee /* ARGSUSED */ 3474c717a561Smaybee static void 3475c717a561Smaybee dbuf_write_done(zio_t *zio, arc_buf_t *buf, void *vdb) 3476c717a561Smaybee { 3477c717a561Smaybee dmu_buf_impl_t *db = vdb; 3478b24ab676SJeff Bonwick blkptr_t *bp_orig = &zio->io_bp_orig; 347943466aaeSMax Grossman blkptr_t *bp = db->db_blkptr; 348043466aaeSMax Grossman objset_t *os = db->db_objset; 348143466aaeSMax Grossman dmu_tx_t *tx = os->os_synctx; 3482c717a561Smaybee dbuf_dirty_record_t **drp, *dr; 3483c717a561Smaybee 3484fb09f5aaSMadhav Suresh ASSERT0(zio->io_error); 3485b24ab676SJeff Bonwick ASSERT(db->db_blkptr == bp); 3486b24ab676SJeff Bonwick 348780901aeaSGeorge Wilson /* 348880901aeaSGeorge Wilson * For nopwrites and rewrites we ensure that the bp matches our 348980901aeaSGeorge Wilson * original and bypass all the accounting. 349080901aeaSGeorge Wilson */ 349180901aeaSGeorge Wilson if (zio->io_flags & (ZIO_FLAG_IO_REWRITE | ZIO_FLAG_NOPWRITE)) { 3492b24ab676SJeff Bonwick ASSERT(BP_EQUAL(bp, bp_orig)); 3493b24ab676SJeff Bonwick } else { 349443466aaeSMax Grossman dsl_dataset_t *ds = os->os_dsl_dataset; 3495b24ab676SJeff Bonwick (void) dsl_dataset_block_kill(ds, bp_orig, tx, B_TRUE); 3496b24ab676SJeff Bonwick dsl_dataset_block_born(ds, bp, tx); 3497b24ab676SJeff Bonwick } 3498c717a561Smaybee 3499c717a561Smaybee mutex_enter(&db->db_mtx); 3500c717a561Smaybee 3501b24ab676SJeff Bonwick DBUF_VERIFY(db); 3502b24ab676SJeff Bonwick 3503c717a561Smaybee drp = &db->db_last_dirty; 350417f17c2dSbonwick while ((dr = *drp) != db->db_data_pending) 350517f17c2dSbonwick drp = &dr->dr_next; 350617f17c2dSbonwick ASSERT(!list_link_active(&dr->dr_dirty_node)); 3507b24ab676SJeff Bonwick ASSERT(dr->dr_dbuf == db); 350817f17c2dSbonwick ASSERT(dr->dr_next == NULL); 350917f17c2dSbonwick *drp = dr->dr_next; 3510c717a561Smaybee 35110a586ceaSMark Shellenbaum #ifdef ZFS_DEBUG 35120a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) { 3513744947dcSTom Erickson dnode_t *dn; 3514744947dcSTom Erickson 3515744947dcSTom Erickson DB_DNODE_ENTER(db); 3516744947dcSTom Erickson dn = DB_DNODE(db); 35170a586ceaSMark Shellenbaum ASSERT(dn->dn_phys->dn_flags & DNODE_FLAG_SPILL_BLKPTR); 35180a586ceaSMark Shellenbaum ASSERT(!(BP_IS_HOLE(db->db_blkptr)) && 351954811da5SToomas Soome db->db_blkptr == DN_SPILL_BLKPTR(dn->dn_phys)); 3520744947dcSTom Erickson DB_DNODE_EXIT(db); 35210a586ceaSMark Shellenbaum } 35220a586ceaSMark Shellenbaum #endif 35230a586ceaSMark Shellenbaum 3524c717a561Smaybee if (db->db_level == 0) { 35250a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 3526c717a561Smaybee ASSERT(dr->dt.dl.dr_override_state == DR_NOT_OVERRIDDEN); 352782c9918fSTim Haley if (db->db_state != DB_NOFILL) { 3528c717a561Smaybee if (dr->dt.dl.dr_data != db->db_buf) 3529dcbf3bd6SGeorge Wilson arc_buf_destroy(dr->dt.dl.dr_data, db); 353082c9918fSTim Haley } 3531c717a561Smaybee } else { 3532744947dcSTom Erickson dnode_t *dn; 3533744947dcSTom Erickson 3534744947dcSTom Erickson DB_DNODE_ENTER(db); 3535744947dcSTom Erickson dn = DB_DNODE(db); 3536c717a561Smaybee ASSERT(list_head(&dr->dt.di.dr_children) == NULL); 3537c717a561Smaybee ASSERT3U(db->db.db_size, ==, 1 << dn->dn_phys->dn_indblkshift); 3538c717a561Smaybee if (!BP_IS_HOLE(db->db_blkptr)) { 3539c717a561Smaybee int epbs = 3540c717a561Smaybee dn->dn_phys->dn_indblkshift - SPA_BLKPTRSHIFT; 354143466aaeSMax Grossman ASSERT3U(db->db_blkid, <=, 354243466aaeSMax Grossman dn->dn_phys->dn_maxblkid >> (db->db_level * epbs)); 3543c717a561Smaybee ASSERT3U(BP_GET_LSIZE(db->db_blkptr), ==, 3544c717a561Smaybee db->db.db_size); 3545c717a561Smaybee } 3546744947dcSTom Erickson DB_DNODE_EXIT(db); 3547c25056deSgw25295 mutex_destroy(&dr->dt.di.dr_mtx); 3548c25056deSgw25295 list_destroy(&dr->dt.di.dr_children); 3549c717a561Smaybee } 3550c717a561Smaybee kmem_free(dr, sizeof (dbuf_dirty_record_t)); 3551c717a561Smaybee 3552c717a561Smaybee cv_broadcast(&db->db_changed); 3553c717a561Smaybee ASSERT(db->db_dirtycnt > 0); 3554c717a561Smaybee db->db_dirtycnt -= 1; 3555c717a561Smaybee db->db_data_pending = NULL; 3556c2919acbSMatthew Ahrens dbuf_rele_and_unlock(db, (void *)(uintptr_t)tx->tx_txg, B_FALSE); 3557b24ab676SJeff Bonwick } 3558b24ab676SJeff Bonwick 3559b24ab676SJeff Bonwick static void 3560b24ab676SJeff Bonwick dbuf_write_nofill_ready(zio_t *zio) 3561b24ab676SJeff Bonwick { 3562b24ab676SJeff Bonwick dbuf_write_ready(zio, NULL, zio->io_private); 3563b24ab676SJeff Bonwick } 3564b24ab676SJeff Bonwick 3565b24ab676SJeff Bonwick static void 3566b24ab676SJeff Bonwick dbuf_write_nofill_done(zio_t *zio) 3567b24ab676SJeff Bonwick { 3568b24ab676SJeff Bonwick dbuf_write_done(zio, NULL, zio->io_private); 3569b24ab676SJeff Bonwick } 3570b24ab676SJeff Bonwick 3571b24ab676SJeff Bonwick static void 3572b24ab676SJeff Bonwick dbuf_write_override_ready(zio_t *zio) 3573b24ab676SJeff Bonwick { 3574b24ab676SJeff Bonwick dbuf_dirty_record_t *dr = zio->io_private; 3575b24ab676SJeff Bonwick dmu_buf_impl_t *db = dr->dr_dbuf; 3576b24ab676SJeff Bonwick 3577b24ab676SJeff Bonwick dbuf_write_ready(zio, NULL, db); 3578b24ab676SJeff Bonwick } 3579b24ab676SJeff Bonwick 3580b24ab676SJeff Bonwick static void 3581b24ab676SJeff Bonwick dbuf_write_override_done(zio_t *zio) 3582b24ab676SJeff Bonwick { 3583b24ab676SJeff Bonwick dbuf_dirty_record_t *dr = zio->io_private; 3584b24ab676SJeff Bonwick dmu_buf_impl_t *db = dr->dr_dbuf; 3585b24ab676SJeff Bonwick blkptr_t *obp = &dr->dt.dl.dr_overridden_by; 3586b24ab676SJeff Bonwick 3587b24ab676SJeff Bonwick mutex_enter(&db->db_mtx); 3588b24ab676SJeff Bonwick if (!BP_EQUAL(zio->io_bp, obp)) { 3589b24ab676SJeff Bonwick if (!BP_IS_HOLE(obp)) 3590b24ab676SJeff Bonwick dsl_free(spa_get_dsl(zio->io_spa), zio->io_txg, obp); 3591b24ab676SJeff Bonwick arc_release(dr->dt.dl.dr_data, db); 3592b24ab676SJeff Bonwick } 3593c717a561Smaybee mutex_exit(&db->db_mtx); 35944ee0199eSRobert Mustacchi dbuf_write_done(zio, NULL, db); 3595770499e1SDan Kimmel 3596770499e1SDan Kimmel if (zio->io_abd != NULL) 3597770499e1SDan Kimmel abd_put(zio->io_abd); 3598b24ab676SJeff Bonwick } 3599c717a561Smaybee 36005cabbc6bSPrashanth Sreenivasa typedef struct dbuf_remap_impl_callback_arg { 36015cabbc6bSPrashanth Sreenivasa objset_t *drica_os; 36025cabbc6bSPrashanth Sreenivasa uint64_t drica_blk_birth; 36035cabbc6bSPrashanth Sreenivasa dmu_tx_t *drica_tx; 36045cabbc6bSPrashanth Sreenivasa } dbuf_remap_impl_callback_arg_t; 36055cabbc6bSPrashanth Sreenivasa 36065cabbc6bSPrashanth Sreenivasa static void 36075cabbc6bSPrashanth Sreenivasa dbuf_remap_impl_callback(uint64_t vdev, uint64_t offset, uint64_t size, 36085cabbc6bSPrashanth Sreenivasa void *arg) 36095cabbc6bSPrashanth Sreenivasa { 36105cabbc6bSPrashanth Sreenivasa dbuf_remap_impl_callback_arg_t *drica = arg; 36115cabbc6bSPrashanth Sreenivasa objset_t *os = drica->drica_os; 36125cabbc6bSPrashanth Sreenivasa spa_t *spa = dmu_objset_spa(os); 36135cabbc6bSPrashanth Sreenivasa dmu_tx_t *tx = drica->drica_tx; 36145cabbc6bSPrashanth Sreenivasa 36155cabbc6bSPrashanth Sreenivasa ASSERT(dsl_pool_sync_context(spa_get_dsl(spa))); 36165cabbc6bSPrashanth Sreenivasa 36175cabbc6bSPrashanth Sreenivasa if (os == spa_meta_objset(spa)) { 36185cabbc6bSPrashanth Sreenivasa spa_vdev_indirect_mark_obsolete(spa, vdev, offset, size, tx); 36195cabbc6bSPrashanth Sreenivasa } else { 36205cabbc6bSPrashanth Sreenivasa dsl_dataset_block_remapped(dmu_objset_ds(os), vdev, offset, 36215cabbc6bSPrashanth Sreenivasa size, drica->drica_blk_birth, tx); 36225cabbc6bSPrashanth Sreenivasa } 36235cabbc6bSPrashanth Sreenivasa } 36245cabbc6bSPrashanth Sreenivasa 36255cabbc6bSPrashanth Sreenivasa static void 36265cabbc6bSPrashanth Sreenivasa dbuf_remap_impl(dnode_t *dn, blkptr_t *bp, dmu_tx_t *tx) 36275cabbc6bSPrashanth Sreenivasa { 36285cabbc6bSPrashanth Sreenivasa blkptr_t bp_copy = *bp; 36295cabbc6bSPrashanth Sreenivasa spa_t *spa = dmu_objset_spa(dn->dn_objset); 36305cabbc6bSPrashanth Sreenivasa dbuf_remap_impl_callback_arg_t drica; 36315cabbc6bSPrashanth Sreenivasa 36325cabbc6bSPrashanth Sreenivasa ASSERT(dsl_pool_sync_context(spa_get_dsl(spa))); 36335cabbc6bSPrashanth Sreenivasa 36345cabbc6bSPrashanth Sreenivasa drica.drica_os = dn->dn_objset; 36355cabbc6bSPrashanth Sreenivasa drica.drica_blk_birth = bp->blk_birth; 36365cabbc6bSPrashanth Sreenivasa drica.drica_tx = tx; 36375cabbc6bSPrashanth Sreenivasa if (spa_remap_blkptr(spa, &bp_copy, dbuf_remap_impl_callback, 36385cabbc6bSPrashanth Sreenivasa &drica)) { 36395cabbc6bSPrashanth Sreenivasa /* 36405cabbc6bSPrashanth Sreenivasa * The struct_rwlock prevents dbuf_read_impl() from 36415cabbc6bSPrashanth Sreenivasa * dereferencing the BP while we are changing it. To 36425cabbc6bSPrashanth Sreenivasa * avoid lock contention, only grab it when we are actually 36435cabbc6bSPrashanth Sreenivasa * changing the BP. 36445cabbc6bSPrashanth Sreenivasa */ 36455cabbc6bSPrashanth Sreenivasa rw_enter(&dn->dn_struct_rwlock, RW_WRITER); 36465cabbc6bSPrashanth Sreenivasa *bp = bp_copy; 36475cabbc6bSPrashanth Sreenivasa rw_exit(&dn->dn_struct_rwlock); 36485cabbc6bSPrashanth Sreenivasa } 36495cabbc6bSPrashanth Sreenivasa } 36505cabbc6bSPrashanth Sreenivasa 36515cabbc6bSPrashanth Sreenivasa /* 36525cabbc6bSPrashanth Sreenivasa * Returns true if a dbuf_remap would modify the dbuf. We do this by attempting 36535cabbc6bSPrashanth Sreenivasa * to remap a copy of every bp in the dbuf. 36545cabbc6bSPrashanth Sreenivasa */ 36555cabbc6bSPrashanth Sreenivasa boolean_t 36565cabbc6bSPrashanth Sreenivasa dbuf_can_remap(const dmu_buf_impl_t *db) 36575cabbc6bSPrashanth Sreenivasa { 36585cabbc6bSPrashanth Sreenivasa spa_t *spa = dmu_objset_spa(db->db_objset); 36595cabbc6bSPrashanth Sreenivasa blkptr_t *bp = db->db.db_data; 36605cabbc6bSPrashanth Sreenivasa boolean_t ret = B_FALSE; 36615cabbc6bSPrashanth Sreenivasa 36625cabbc6bSPrashanth Sreenivasa ASSERT3U(db->db_level, >, 0); 36635cabbc6bSPrashanth Sreenivasa ASSERT3S(db->db_state, ==, DB_CACHED); 36645cabbc6bSPrashanth Sreenivasa 36655cabbc6bSPrashanth Sreenivasa ASSERT(spa_feature_is_active(spa, SPA_FEATURE_DEVICE_REMOVAL)); 36665cabbc6bSPrashanth Sreenivasa 36675cabbc6bSPrashanth Sreenivasa spa_config_enter(spa, SCL_VDEV, FTAG, RW_READER); 36685cabbc6bSPrashanth Sreenivasa for (int i = 0; i < db->db.db_size >> SPA_BLKPTRSHIFT; i++) { 36695cabbc6bSPrashanth Sreenivasa blkptr_t bp_copy = bp[i]; 36705cabbc6bSPrashanth Sreenivasa if (spa_remap_blkptr(spa, &bp_copy, NULL, NULL)) { 36715cabbc6bSPrashanth Sreenivasa ret = B_TRUE; 36725cabbc6bSPrashanth Sreenivasa break; 36735cabbc6bSPrashanth Sreenivasa } 36745cabbc6bSPrashanth Sreenivasa } 36755cabbc6bSPrashanth Sreenivasa spa_config_exit(spa, SCL_VDEV, FTAG); 36765cabbc6bSPrashanth Sreenivasa 36775cabbc6bSPrashanth Sreenivasa return (ret); 36785cabbc6bSPrashanth Sreenivasa } 36795cabbc6bSPrashanth Sreenivasa 36805cabbc6bSPrashanth Sreenivasa boolean_t 36815cabbc6bSPrashanth Sreenivasa dnode_needs_remap(const dnode_t *dn) 36825cabbc6bSPrashanth Sreenivasa { 36835cabbc6bSPrashanth Sreenivasa spa_t *spa = dmu_objset_spa(dn->dn_objset); 36845cabbc6bSPrashanth Sreenivasa boolean_t ret = B_FALSE; 36855cabbc6bSPrashanth Sreenivasa 36865cabbc6bSPrashanth Sreenivasa if (dn->dn_phys->dn_nlevels == 0) { 36875cabbc6bSPrashanth Sreenivasa return (B_FALSE); 36885cabbc6bSPrashanth Sreenivasa } 36895cabbc6bSPrashanth Sreenivasa 36905cabbc6bSPrashanth Sreenivasa ASSERT(spa_feature_is_active(spa, SPA_FEATURE_DEVICE_REMOVAL)); 36915cabbc6bSPrashanth Sreenivasa 36925cabbc6bSPrashanth Sreenivasa spa_config_enter(spa, SCL_VDEV, FTAG, RW_READER); 36935cabbc6bSPrashanth Sreenivasa for (int j = 0; j < dn->dn_phys->dn_nblkptr; j++) { 36945cabbc6bSPrashanth Sreenivasa blkptr_t bp_copy = dn->dn_phys->dn_blkptr[j]; 36955cabbc6bSPrashanth Sreenivasa if (spa_remap_blkptr(spa, &bp_copy, NULL, NULL)) { 36965cabbc6bSPrashanth Sreenivasa ret = B_TRUE; 36975cabbc6bSPrashanth Sreenivasa break; 36985cabbc6bSPrashanth Sreenivasa } 36995cabbc6bSPrashanth Sreenivasa } 37005cabbc6bSPrashanth Sreenivasa spa_config_exit(spa, SCL_VDEV, FTAG); 37015cabbc6bSPrashanth Sreenivasa 37025cabbc6bSPrashanth Sreenivasa return (ret); 37035cabbc6bSPrashanth Sreenivasa } 37045cabbc6bSPrashanth Sreenivasa 37055cabbc6bSPrashanth Sreenivasa /* 37065cabbc6bSPrashanth Sreenivasa * Remap any existing BP's to concrete vdevs, if possible. 37075cabbc6bSPrashanth Sreenivasa */ 37085cabbc6bSPrashanth Sreenivasa static void 37095cabbc6bSPrashanth Sreenivasa dbuf_remap(dnode_t *dn, dmu_buf_impl_t *db, dmu_tx_t *tx) 37105cabbc6bSPrashanth Sreenivasa { 37115cabbc6bSPrashanth Sreenivasa spa_t *spa = dmu_objset_spa(db->db_objset); 37125cabbc6bSPrashanth Sreenivasa ASSERT(dsl_pool_sync_context(spa_get_dsl(spa))); 37135cabbc6bSPrashanth Sreenivasa 37145cabbc6bSPrashanth Sreenivasa if (!spa_feature_is_active(spa, SPA_FEATURE_DEVICE_REMOVAL)) 37155cabbc6bSPrashanth Sreenivasa return; 37165cabbc6bSPrashanth Sreenivasa 37175cabbc6bSPrashanth Sreenivasa if (db->db_level > 0) { 37185cabbc6bSPrashanth Sreenivasa blkptr_t *bp = db->db.db_data; 37195cabbc6bSPrashanth Sreenivasa for (int i = 0; i < db->db.db_size >> SPA_BLKPTRSHIFT; i++) { 37205cabbc6bSPrashanth Sreenivasa dbuf_remap_impl(dn, &bp[i], tx); 37215cabbc6bSPrashanth Sreenivasa } 37225cabbc6bSPrashanth Sreenivasa } else if (db->db.db_object == DMU_META_DNODE_OBJECT) { 37235cabbc6bSPrashanth Sreenivasa dnode_phys_t *dnp = db->db.db_data; 37245cabbc6bSPrashanth Sreenivasa ASSERT3U(db->db_dnode_handle->dnh_dnode->dn_type, ==, 37255cabbc6bSPrashanth Sreenivasa DMU_OT_DNODE); 37265cabbc6bSPrashanth Sreenivasa for (int i = 0; i < db->db.db_size >> DNODE_SHIFT; i++) { 37275cabbc6bSPrashanth Sreenivasa for (int j = 0; j < dnp[i].dn_nblkptr; j++) { 37285cabbc6bSPrashanth Sreenivasa dbuf_remap_impl(dn, &dnp[i].dn_blkptr[j], tx); 37295cabbc6bSPrashanth Sreenivasa } 37305cabbc6bSPrashanth Sreenivasa } 37315cabbc6bSPrashanth Sreenivasa } 37325cabbc6bSPrashanth Sreenivasa } 37335cabbc6bSPrashanth Sreenivasa 37345cabbc6bSPrashanth Sreenivasa 37353e30c24aSWill Andrews /* Issue I/O to commit a dirty buffer to disk. */ 3736b24ab676SJeff Bonwick static void 3737b24ab676SJeff Bonwick dbuf_write(dbuf_dirty_record_t *dr, arc_buf_t *data, dmu_tx_t *tx) 3738b24ab676SJeff Bonwick { 3739b24ab676SJeff Bonwick dmu_buf_impl_t *db = dr->dr_dbuf; 3740744947dcSTom Erickson dnode_t *dn; 3741744947dcSTom Erickson objset_t *os; 3742b24ab676SJeff Bonwick dmu_buf_impl_t *parent = db->db_parent; 3743b24ab676SJeff Bonwick uint64_t txg = tx->tx_txg; 37447802d7bfSMatthew Ahrens zbookmark_phys_t zb; 3745b24ab676SJeff Bonwick zio_prop_t zp; 3746b24ab676SJeff Bonwick zio_t *zio; 37470a586ceaSMark Shellenbaum int wp_flag = 0; 3748b24ab676SJeff Bonwick 374911ceac77SAlex Reece ASSERT(dmu_tx_is_syncing(tx)); 375011ceac77SAlex Reece 3751744947dcSTom Erickson DB_DNODE_ENTER(db); 3752744947dcSTom Erickson dn = DB_DNODE(db); 3753744947dcSTom Erickson os = dn->dn_objset; 3754744947dcSTom Erickson 3755b24ab676SJeff Bonwick if (db->db_state != DB_NOFILL) { 3756b24ab676SJeff Bonwick if (db->db_level > 0 || dn->dn_type == DMU_OT_DNODE) { 3757b24ab676SJeff Bonwick /* 3758b24ab676SJeff Bonwick * Private object buffers are released here rather 3759b24ab676SJeff Bonwick * than in dbuf_dirty() since they are only modified 3760b24ab676SJeff Bonwick * in the syncing context and we don't want the 3761b24ab676SJeff Bonwick * overhead of making multiple copies of the data. 3762b24ab676SJeff Bonwick */ 3763b24ab676SJeff Bonwick if (BP_IS_HOLE(db->db_blkptr)) { 3764b24ab676SJeff Bonwick arc_buf_thaw(data); 3765b24ab676SJeff Bonwick } else { 37663f9d6ad7SLin Ling dbuf_release_bp(db); 3767b24ab676SJeff Bonwick } 37685cabbc6bSPrashanth Sreenivasa dbuf_remap(dn, db, tx); 3769b24ab676SJeff Bonwick } 3770b24ab676SJeff Bonwick } 3771b24ab676SJeff Bonwick 3772b24ab676SJeff Bonwick if (parent != dn->dn_dbuf) { 37733e30c24aSWill Andrews /* Our parent is an indirect block. */ 37743e30c24aSWill Andrews /* We have a dirty parent that has been scheduled for write. */ 3775b24ab676SJeff Bonwick ASSERT(parent && parent->db_data_pending); 37763e30c24aSWill Andrews /* Our parent's buffer is one level closer to the dnode. */ 3777b24ab676SJeff Bonwick ASSERT(db->db_level == parent->db_level-1); 37783e30c24aSWill Andrews /* 37793e30c24aSWill Andrews * We're about to modify our parent's db_data by modifying 37803e30c24aSWill Andrews * our block pointer, so the parent must be released. 37813e30c24aSWill Andrews */ 3782b24ab676SJeff Bonwick ASSERT(arc_released(parent->db_buf)); 3783b24ab676SJeff Bonwick zio = parent->db_data_pending->dr_zio; 3784b24ab676SJeff Bonwick } else { 37853e30c24aSWill Andrews /* Our parent is the dnode itself. */ 37860a586ceaSMark Shellenbaum ASSERT((db->db_level == dn->dn_phys->dn_nlevels-1 && 37870a586ceaSMark Shellenbaum db->db_blkid != DMU_SPILL_BLKID) || 37880a586ceaSMark Shellenbaum (db->db_blkid == DMU_SPILL_BLKID && db->db_level == 0)); 37890a586ceaSMark Shellenbaum if (db->db_blkid != DMU_SPILL_BLKID) 3790b24ab676SJeff Bonwick ASSERT3P(db->db_blkptr, ==, 3791b24ab676SJeff Bonwick &dn->dn_phys->dn_blkptr[db->db_blkid]); 3792b24ab676SJeff Bonwick zio = dn->dn_zio; 3793b24ab676SJeff Bonwick } 3794b24ab676SJeff Bonwick 3795b24ab676SJeff Bonwick ASSERT(db->db_level == 0 || data == db->db_buf); 3796b24ab676SJeff Bonwick ASSERT3U(db->db_blkptr->blk_birth, <=, txg); 3797b24ab676SJeff Bonwick ASSERT(zio); 3798b24ab676SJeff Bonwick 3799b24ab676SJeff Bonwick SET_BOOKMARK(&zb, os->os_dsl_dataset ? 3800b24ab676SJeff Bonwick os->os_dsl_dataset->ds_object : DMU_META_OBJSET, 3801b24ab676SJeff Bonwick db->db.db_object, db->db_level, db->db_blkid); 3802b24ab676SJeff Bonwick 38030a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) 38040a586ceaSMark Shellenbaum wp_flag = WP_SPILL; 38050a586ceaSMark Shellenbaum wp_flag |= (db->db_state == DB_NOFILL) ? WP_NOFILL : 0; 38060a586ceaSMark Shellenbaum 3807adaec86aSMatthew Ahrens dmu_write_policy(os, dn, db->db_level, wp_flag, &zp); 3808744947dcSTom Erickson DB_DNODE_EXIT(db); 3809b24ab676SJeff Bonwick 381011ceac77SAlex Reece /* 381111ceac77SAlex Reece * We copy the blkptr now (rather than when we instantiate the dirty 381211ceac77SAlex Reece * record), because its value can change between open context and 381311ceac77SAlex Reece * syncing context. We do not need to hold dn_struct_rwlock to read 381411ceac77SAlex Reece * db_blkptr because we are in syncing context. 381511ceac77SAlex Reece */ 381611ceac77SAlex Reece dr->dr_bp_copy = *db->db_blkptr; 381711ceac77SAlex Reece 38185d7b4d43SMatthew Ahrens if (db->db_level == 0 && 38195d7b4d43SMatthew Ahrens dr->dt.dl.dr_override_state == DR_OVERRIDDEN) { 38205d7b4d43SMatthew Ahrens /* 38215d7b4d43SMatthew Ahrens * The BP for this block has been provided by open context 38225d7b4d43SMatthew Ahrens * (by dmu_sync() or dmu_buf_write_embedded()). 38235d7b4d43SMatthew Ahrens */ 3824770499e1SDan Kimmel abd_t *contents = (data != NULL) ? 3825770499e1SDan Kimmel abd_get_from_buf(data->b_data, arc_buf_size(data)) : NULL; 38265d7b4d43SMatthew Ahrens 38275602294fSDan Kimmel dr->dr_zio = zio_write(zio, os->os_spa, txg, &dr->dr_bp_copy, 38285602294fSDan Kimmel contents, db->db.db_size, db->db.db_size, &zp, 38298df0bcf0SPaul Dagnelie dbuf_write_override_ready, NULL, NULL, 38308df0bcf0SPaul Dagnelie dbuf_write_override_done, 383169962b56SMatthew Ahrens dr, ZIO_PRIORITY_ASYNC_WRITE, ZIO_FLAG_MUSTSUCCEED, &zb); 3832b24ab676SJeff Bonwick mutex_enter(&db->db_mtx); 3833b24ab676SJeff Bonwick dr->dt.dl.dr_override_state = DR_NOT_OVERRIDDEN; 3834b24ab676SJeff Bonwick zio_write_override(dr->dr_zio, &dr->dt.dl.dr_overridden_by, 383580901aeaSGeorge Wilson dr->dt.dl.dr_copies, dr->dt.dl.dr_nopwrite); 3836b24ab676SJeff Bonwick mutex_exit(&db->db_mtx); 3837b24ab676SJeff Bonwick } else if (db->db_state == DB_NOFILL) { 3838810e43b2SBill Pijewski ASSERT(zp.zp_checksum == ZIO_CHECKSUM_OFF || 3839810e43b2SBill Pijewski zp.zp_checksum == ZIO_CHECKSUM_NOPARITY); 3840b24ab676SJeff Bonwick dr->dr_zio = zio_write(zio, os->os_spa, txg, 38415602294fSDan Kimmel &dr->dr_bp_copy, NULL, db->db.db_size, db->db.db_size, &zp, 38428df0bcf0SPaul Dagnelie dbuf_write_nofill_ready, NULL, NULL, 38438df0bcf0SPaul Dagnelie dbuf_write_nofill_done, db, 3844b24ab676SJeff Bonwick ZIO_PRIORITY_ASYNC_WRITE, 3845b24ab676SJeff Bonwick ZIO_FLAG_MUSTSUCCEED | ZIO_FLAG_NODATA, &zb); 3846b24ab676SJeff Bonwick } else { 3847b24ab676SJeff Bonwick ASSERT(arc_released(data)); 38488df0bcf0SPaul Dagnelie 38498df0bcf0SPaul Dagnelie /* 38508df0bcf0SPaul Dagnelie * For indirect blocks, we want to setup the children 38518df0bcf0SPaul Dagnelie * ready callback so that we can properly handle an indirect 38528df0bcf0SPaul Dagnelie * block that only contains holes. 38538df0bcf0SPaul Dagnelie */ 38548df0bcf0SPaul Dagnelie arc_done_func_t *children_ready_cb = NULL; 38558df0bcf0SPaul Dagnelie if (db->db_level != 0) 38568df0bcf0SPaul Dagnelie children_ready_cb = dbuf_write_children_ready; 38578df0bcf0SPaul Dagnelie 3858b24ab676SJeff Bonwick dr->dr_zio = arc_write(zio, os->os_spa, txg, 385911ceac77SAlex Reece &dr->dr_bp_copy, data, DBUF_IS_L2CACHEABLE(db), 3860dcbf3bd6SGeorge Wilson &zp, dbuf_write_ready, children_ready_cb, 386169962b56SMatthew Ahrens dbuf_write_physdone, dbuf_write_done, db, 386269962b56SMatthew Ahrens ZIO_PRIORITY_ASYNC_WRITE, ZIO_FLAG_MUSTSUCCEED, &zb); 3863b24ab676SJeff Bonwick } 3864fa9e4066Sahrens } 3865