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. 24ae972795SMatthew Ahrens * Copyright (c) 2012, 2016 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> 49dcbf3bd6SGeorge Wilson 50dcbf3bd6SGeorge Wilson uint_t zfs_dbuf_evict_key; 51fa9e4066Sahrens 523b2aab18SMatthew Ahrens static boolean_t dbuf_undirty(dmu_buf_impl_t *db, dmu_tx_t *tx); 53088f3894Sahrens static void dbuf_write(dbuf_dirty_record_t *dr, arc_buf_t *data, dmu_tx_t *tx); 54fa9e4066Sahrens 55bc9014e6SJustin Gibbs #ifndef __lint 56bc9014e6SJustin Gibbs extern inline void dmu_buf_init_user(dmu_buf_user_t *dbu, 57bc9014e6SJustin Gibbs dmu_buf_evict_func_t *evict_func, dmu_buf_t **clear_on_evict_dbufp); 58bc9014e6SJustin Gibbs #endif /* ! __lint */ 59bc9014e6SJustin Gibbs 60fa9e4066Sahrens /* 61fa9e4066Sahrens * Global data structures and functions for the dbuf cache. 62fa9e4066Sahrens */ 63dcbf3bd6SGeorge Wilson static kmem_cache_t *dbuf_kmem_cache; 64bc9014e6SJustin Gibbs static taskq_t *dbu_evict_taskq; 65fa9e4066Sahrens 66dcbf3bd6SGeorge Wilson static kthread_t *dbuf_cache_evict_thread; 67dcbf3bd6SGeorge Wilson static kmutex_t dbuf_evict_lock; 68dcbf3bd6SGeorge Wilson static kcondvar_t dbuf_evict_cv; 69dcbf3bd6SGeorge Wilson static boolean_t dbuf_evict_thread_exit; 70dcbf3bd6SGeorge Wilson 71dcbf3bd6SGeorge Wilson /* 72dcbf3bd6SGeorge Wilson * LRU cache of dbufs. The dbuf cache maintains a list of dbufs that 73dcbf3bd6SGeorge Wilson * are not currently held but have been recently released. These dbufs 74dcbf3bd6SGeorge Wilson * are not eligible for arc eviction until they are aged out of the cache. 75dcbf3bd6SGeorge Wilson * Dbufs are added to the dbuf cache once the last hold is released. If a 76dcbf3bd6SGeorge Wilson * dbuf is later accessed and still exists in the dbuf cache, then it will 77dcbf3bd6SGeorge Wilson * be removed from the cache and later re-added to the head of the cache. 78dcbf3bd6SGeorge Wilson * Dbufs that are aged out of the cache will be immediately destroyed and 79dcbf3bd6SGeorge Wilson * become eligible for arc eviction. 80dcbf3bd6SGeorge Wilson */ 81dcbf3bd6SGeorge Wilson static multilist_t dbuf_cache; 82dcbf3bd6SGeorge Wilson static refcount_t dbuf_cache_size; 83dcbf3bd6SGeorge Wilson uint64_t dbuf_cache_max_bytes = 100 * 1024 * 1024; 84dcbf3bd6SGeorge Wilson 85dcbf3bd6SGeorge Wilson /* Cap the size of the dbuf cache to log2 fraction of arc size. */ 86dcbf3bd6SGeorge Wilson int dbuf_cache_max_shift = 5; 87dcbf3bd6SGeorge Wilson 88dcbf3bd6SGeorge Wilson /* 89dcbf3bd6SGeorge Wilson * The dbuf cache uses a three-stage eviction policy: 90dcbf3bd6SGeorge Wilson * - A low water marker designates when the dbuf eviction thread 91dcbf3bd6SGeorge Wilson * should stop evicting from the dbuf cache. 92dcbf3bd6SGeorge Wilson * - When we reach the maximum size (aka mid water mark), we 93dcbf3bd6SGeorge Wilson * signal the eviction thread to run. 94dcbf3bd6SGeorge Wilson * - The high water mark indicates when the eviction thread 95dcbf3bd6SGeorge Wilson * is unable to keep up with the incoming load and eviction must 96dcbf3bd6SGeorge Wilson * happen in the context of the calling thread. 97dcbf3bd6SGeorge Wilson * 98dcbf3bd6SGeorge Wilson * The dbuf cache: 99dcbf3bd6SGeorge Wilson * (max size) 100dcbf3bd6SGeorge Wilson * low water mid water hi water 101dcbf3bd6SGeorge Wilson * +----------------------------------------+----------+----------+ 102dcbf3bd6SGeorge Wilson * | | | | 103dcbf3bd6SGeorge Wilson * | | | | 104dcbf3bd6SGeorge Wilson * | | | | 105dcbf3bd6SGeorge Wilson * | | | | 106dcbf3bd6SGeorge Wilson * +----------------------------------------+----------+----------+ 107dcbf3bd6SGeorge Wilson * stop signal evict 108dcbf3bd6SGeorge Wilson * evicting eviction directly 109dcbf3bd6SGeorge Wilson * thread 110dcbf3bd6SGeorge Wilson * 111dcbf3bd6SGeorge Wilson * The high and low water marks indicate the operating range for the eviction 112dcbf3bd6SGeorge Wilson * thread. The low water mark is, by default, 90% of the total size of the 113dcbf3bd6SGeorge Wilson * cache and the high water mark is at 110% (both of these percentages can be 114dcbf3bd6SGeorge Wilson * changed by setting dbuf_cache_lowater_pct and dbuf_cache_hiwater_pct, 115dcbf3bd6SGeorge Wilson * respectively). The eviction thread will try to ensure that the cache remains 116dcbf3bd6SGeorge Wilson * within this range by waking up every second and checking if the cache is 117dcbf3bd6SGeorge Wilson * above the low water mark. The thread can also be woken up by callers adding 118dcbf3bd6SGeorge Wilson * elements into the cache if the cache is larger than the mid water (i.e max 119dcbf3bd6SGeorge Wilson * cache size). Once the eviction thread is woken up and eviction is required, 120dcbf3bd6SGeorge Wilson * it will continue evicting buffers until it's able to reduce the cache size 121dcbf3bd6SGeorge Wilson * to the low water mark. If the cache size continues to grow and hits the high 122dcbf3bd6SGeorge Wilson * water mark, then callers adding elments to the cache will begin to evict 123dcbf3bd6SGeorge Wilson * directly from the cache until the cache is no longer above the high water 124dcbf3bd6SGeorge Wilson * mark. 125dcbf3bd6SGeorge Wilson */ 126dcbf3bd6SGeorge Wilson 127dcbf3bd6SGeorge Wilson /* 128dcbf3bd6SGeorge Wilson * The percentage above and below the maximum cache size. 129dcbf3bd6SGeorge Wilson */ 130dcbf3bd6SGeorge Wilson uint_t dbuf_cache_hiwater_pct = 10; 131dcbf3bd6SGeorge Wilson uint_t dbuf_cache_lowater_pct = 10; 132dcbf3bd6SGeorge Wilson 133fa9e4066Sahrens /* ARGSUSED */ 134fa9e4066Sahrens static int 135fa9e4066Sahrens dbuf_cons(void *vdb, void *unused, int kmflag) 136fa9e4066Sahrens { 137fa9e4066Sahrens dmu_buf_impl_t *db = vdb; 138fa9e4066Sahrens bzero(db, sizeof (dmu_buf_impl_t)); 139fa9e4066Sahrens 140fa9e4066Sahrens mutex_init(&db->db_mtx, NULL, MUTEX_DEFAULT, NULL); 141fa9e4066Sahrens cv_init(&db->db_changed, NULL, CV_DEFAULT, NULL); 142dcbf3bd6SGeorge Wilson multilist_link_init(&db->db_cache_link); 143fa9e4066Sahrens refcount_create(&db->db_holds); 1440f6d88adSAlex Reece 145fa9e4066Sahrens return (0); 146fa9e4066Sahrens } 147fa9e4066Sahrens 148fa9e4066Sahrens /* ARGSUSED */ 149fa9e4066Sahrens static void 150fa9e4066Sahrens dbuf_dest(void *vdb, void *unused) 151fa9e4066Sahrens { 152fa9e4066Sahrens dmu_buf_impl_t *db = vdb; 153fa9e4066Sahrens mutex_destroy(&db->db_mtx); 154fa9e4066Sahrens cv_destroy(&db->db_changed); 155dcbf3bd6SGeorge Wilson ASSERT(!multilist_link_active(&db->db_cache_link)); 156fa9e4066Sahrens refcount_destroy(&db->db_holds); 157fa9e4066Sahrens } 158fa9e4066Sahrens 159fa9e4066Sahrens /* 160fa9e4066Sahrens * dbuf hash table routines 161fa9e4066Sahrens */ 162fa9e4066Sahrens static dbuf_hash_table_t dbuf_hash_table; 163fa9e4066Sahrens 164fa9e4066Sahrens static uint64_t dbuf_hash_count; 165fa9e4066Sahrens 166fa9e4066Sahrens static uint64_t 167fa9e4066Sahrens dbuf_hash(void *os, uint64_t obj, uint8_t lvl, uint64_t blkid) 168fa9e4066Sahrens { 169fa9e4066Sahrens uintptr_t osv = (uintptr_t)os; 170fa9e4066Sahrens uint64_t crc = -1ULL; 171fa9e4066Sahrens 172fa9e4066Sahrens ASSERT(zfs_crc64_table[128] == ZFS_CRC64_POLY); 173fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (lvl)) & 0xFF]; 174fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (osv >> 6)) & 0xFF]; 175fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (obj >> 0)) & 0xFF]; 176fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (obj >> 8)) & 0xFF]; 177fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (blkid >> 0)) & 0xFF]; 178fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (blkid >> 8)) & 0xFF]; 179fa9e4066Sahrens 180fa9e4066Sahrens crc ^= (osv>>14) ^ (obj>>16) ^ (blkid>>16); 181fa9e4066Sahrens 182fa9e4066Sahrens return (crc); 183fa9e4066Sahrens } 184fa9e4066Sahrens 185fa9e4066Sahrens #define DBUF_EQUAL(dbuf, os, obj, level, blkid) \ 186fa9e4066Sahrens ((dbuf)->db.db_object == (obj) && \ 187fa9e4066Sahrens (dbuf)->db_objset == (os) && \ 188fa9e4066Sahrens (dbuf)->db_level == (level) && \ 189fa9e4066Sahrens (dbuf)->db_blkid == (blkid)) 190fa9e4066Sahrens 191fa9e4066Sahrens dmu_buf_impl_t * 192e57a022bSJustin T. Gibbs dbuf_find(objset_t *os, uint64_t obj, uint8_t level, uint64_t blkid) 193fa9e4066Sahrens { 194fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 195dcbf3bd6SGeorge Wilson uint64_t hv = dbuf_hash(os, obj, level, blkid); 196fa9e4066Sahrens uint64_t idx = hv & h->hash_table_mask; 197fa9e4066Sahrens dmu_buf_impl_t *db; 198fa9e4066Sahrens 199fa9e4066Sahrens mutex_enter(DBUF_HASH_MUTEX(h, idx)); 200fa9e4066Sahrens for (db = h->hash_table[idx]; db != NULL; db = db->db_hash_next) { 201fa9e4066Sahrens if (DBUF_EQUAL(db, os, obj, level, blkid)) { 202fa9e4066Sahrens mutex_enter(&db->db_mtx); 203ea8dc4b6Seschrock if (db->db_state != DB_EVICTING) { 204fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 205fa9e4066Sahrens return (db); 206fa9e4066Sahrens } 207fa9e4066Sahrens mutex_exit(&db->db_mtx); 208fa9e4066Sahrens } 209fa9e4066Sahrens } 210fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 211fa9e4066Sahrens return (NULL); 212fa9e4066Sahrens } 213fa9e4066Sahrens 214e57a022bSJustin T. Gibbs static dmu_buf_impl_t * 215e57a022bSJustin T. Gibbs dbuf_find_bonus(objset_t *os, uint64_t object) 216e57a022bSJustin T. Gibbs { 217e57a022bSJustin T. Gibbs dnode_t *dn; 218e57a022bSJustin T. Gibbs dmu_buf_impl_t *db = NULL; 219e57a022bSJustin T. Gibbs 220e57a022bSJustin T. Gibbs if (dnode_hold(os, object, FTAG, &dn) == 0) { 221e57a022bSJustin T. Gibbs rw_enter(&dn->dn_struct_rwlock, RW_READER); 222e57a022bSJustin T. Gibbs if (dn->dn_bonus != NULL) { 223e57a022bSJustin T. Gibbs db = dn->dn_bonus; 224e57a022bSJustin T. Gibbs mutex_enter(&db->db_mtx); 225e57a022bSJustin T. Gibbs } 226e57a022bSJustin T. Gibbs rw_exit(&dn->dn_struct_rwlock); 227e57a022bSJustin T. Gibbs dnode_rele(dn, FTAG); 228e57a022bSJustin T. Gibbs } 229e57a022bSJustin T. Gibbs return (db); 230e57a022bSJustin T. Gibbs } 231e57a022bSJustin T. Gibbs 232fa9e4066Sahrens /* 233fa9e4066Sahrens * Insert an entry into the hash table. If there is already an element 234fa9e4066Sahrens * equal to elem in the hash table, then the already existing element 235fa9e4066Sahrens * will be returned and the new element will not be inserted. 236fa9e4066Sahrens * Otherwise returns NULL. 237fa9e4066Sahrens */ 238fa9e4066Sahrens static dmu_buf_impl_t * 239fa9e4066Sahrens dbuf_hash_insert(dmu_buf_impl_t *db) 240fa9e4066Sahrens { 241fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 242503ad85cSMatthew Ahrens objset_t *os = db->db_objset; 243fa9e4066Sahrens uint64_t obj = db->db.db_object; 244fa9e4066Sahrens int level = db->db_level; 245fa9e4066Sahrens uint64_t blkid = db->db_blkid; 246dcbf3bd6SGeorge Wilson uint64_t hv = dbuf_hash(os, obj, level, blkid); 247fa9e4066Sahrens uint64_t idx = hv & h->hash_table_mask; 248fa9e4066Sahrens dmu_buf_impl_t *dbf; 249fa9e4066Sahrens 250fa9e4066Sahrens mutex_enter(DBUF_HASH_MUTEX(h, idx)); 251fa9e4066Sahrens for (dbf = h->hash_table[idx]; dbf != NULL; dbf = dbf->db_hash_next) { 252fa9e4066Sahrens if (DBUF_EQUAL(dbf, os, obj, level, blkid)) { 253fa9e4066Sahrens mutex_enter(&dbf->db_mtx); 254ea8dc4b6Seschrock if (dbf->db_state != DB_EVICTING) { 255fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 256fa9e4066Sahrens return (dbf); 257fa9e4066Sahrens } 258fa9e4066Sahrens mutex_exit(&dbf->db_mtx); 259fa9e4066Sahrens } 260fa9e4066Sahrens } 261fa9e4066Sahrens 262fa9e4066Sahrens mutex_enter(&db->db_mtx); 263fa9e4066Sahrens db->db_hash_next = h->hash_table[idx]; 264fa9e4066Sahrens h->hash_table[idx] = db; 265fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 2661a5e258fSJosef 'Jeff' Sipek atomic_inc_64(&dbuf_hash_count); 267fa9e4066Sahrens 268fa9e4066Sahrens return (NULL); 269fa9e4066Sahrens } 270fa9e4066Sahrens 271fa9e4066Sahrens /* 272bbfa8ea8SMatthew Ahrens * Remove an entry from the hash table. It must be in the EVICTING state. 273fa9e4066Sahrens */ 274fa9e4066Sahrens static void 275fa9e4066Sahrens dbuf_hash_remove(dmu_buf_impl_t *db) 276fa9e4066Sahrens { 277fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 278dcbf3bd6SGeorge Wilson uint64_t hv = dbuf_hash(db->db_objset, db->db.db_object, 279fa9e4066Sahrens db->db_level, db->db_blkid); 280fa9e4066Sahrens uint64_t idx = hv & h->hash_table_mask; 281fa9e4066Sahrens dmu_buf_impl_t *dbf, **dbp; 282fa9e4066Sahrens 283fa9e4066Sahrens /* 284bbfa8ea8SMatthew Ahrens * We musn't hold db_mtx to maintain lock ordering: 285fa9e4066Sahrens * DBUF_HASH_MUTEX > db_mtx. 286fa9e4066Sahrens */ 287fa9e4066Sahrens ASSERT(refcount_is_zero(&db->db_holds)); 288ea8dc4b6Seschrock ASSERT(db->db_state == DB_EVICTING); 289fa9e4066Sahrens ASSERT(!MUTEX_HELD(&db->db_mtx)); 290fa9e4066Sahrens 291fa9e4066Sahrens mutex_enter(DBUF_HASH_MUTEX(h, idx)); 292fa9e4066Sahrens dbp = &h->hash_table[idx]; 293fa9e4066Sahrens while ((dbf = *dbp) != db) { 294fa9e4066Sahrens dbp = &dbf->db_hash_next; 295fa9e4066Sahrens ASSERT(dbf != NULL); 296fa9e4066Sahrens } 297fa9e4066Sahrens *dbp = db->db_hash_next; 298fa9e4066Sahrens db->db_hash_next = NULL; 299fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 3001a5e258fSJosef 'Jeff' Sipek atomic_dec_64(&dbuf_hash_count); 301fa9e4066Sahrens } 302fa9e4066Sahrens 303bc9014e6SJustin Gibbs typedef enum { 304bc9014e6SJustin Gibbs DBVU_EVICTING, 305bc9014e6SJustin Gibbs DBVU_NOT_EVICTING 306bc9014e6SJustin Gibbs } dbvu_verify_type_t; 307bc9014e6SJustin Gibbs 308bc9014e6SJustin Gibbs static void 309bc9014e6SJustin Gibbs dbuf_verify_user(dmu_buf_impl_t *db, dbvu_verify_type_t verify_type) 310bc9014e6SJustin Gibbs { 311bc9014e6SJustin Gibbs #ifdef ZFS_DEBUG 312bc9014e6SJustin Gibbs int64_t holds; 313bc9014e6SJustin Gibbs 314bc9014e6SJustin Gibbs if (db->db_user == NULL) 315bc9014e6SJustin Gibbs return; 316bc9014e6SJustin Gibbs 317bc9014e6SJustin Gibbs /* Only data blocks support the attachment of user data. */ 318bc9014e6SJustin Gibbs ASSERT(db->db_level == 0); 319bc9014e6SJustin Gibbs 320bc9014e6SJustin Gibbs /* Clients must resolve a dbuf before attaching user data. */ 321bc9014e6SJustin Gibbs ASSERT(db->db.db_data != NULL); 322bc9014e6SJustin Gibbs ASSERT3U(db->db_state, ==, DB_CACHED); 323bc9014e6SJustin Gibbs 324bc9014e6SJustin Gibbs holds = refcount_count(&db->db_holds); 325bc9014e6SJustin Gibbs if (verify_type == DBVU_EVICTING) { 326bc9014e6SJustin Gibbs /* 327bc9014e6SJustin Gibbs * Immediate eviction occurs when holds == dirtycnt. 328bc9014e6SJustin Gibbs * For normal eviction buffers, holds is zero on 329bc9014e6SJustin Gibbs * eviction, except when dbuf_fix_old_data() calls 330bc9014e6SJustin Gibbs * dbuf_clear_data(). However, the hold count can grow 331bc9014e6SJustin Gibbs * during eviction even though db_mtx is held (see 332bc9014e6SJustin Gibbs * dmu_bonus_hold() for an example), so we can only 333bc9014e6SJustin Gibbs * test the generic invariant that holds >= dirtycnt. 334bc9014e6SJustin Gibbs */ 335bc9014e6SJustin Gibbs ASSERT3U(holds, >=, db->db_dirtycnt); 336bc9014e6SJustin Gibbs } else { 337d2058105SJustin T. Gibbs if (db->db_user_immediate_evict == TRUE) 338bc9014e6SJustin Gibbs ASSERT3U(holds, >=, db->db_dirtycnt); 339bc9014e6SJustin Gibbs else 340bc9014e6SJustin Gibbs ASSERT3U(holds, >, 0); 341bc9014e6SJustin Gibbs } 342bc9014e6SJustin Gibbs #endif 343bc9014e6SJustin Gibbs } 344bc9014e6SJustin Gibbs 345fa9e4066Sahrens static void 346fa9e4066Sahrens dbuf_evict_user(dmu_buf_impl_t *db) 347fa9e4066Sahrens { 348bc9014e6SJustin Gibbs dmu_buf_user_t *dbu = db->db_user; 349bc9014e6SJustin Gibbs 350fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 351fa9e4066Sahrens 352bc9014e6SJustin Gibbs if (dbu == NULL) 353fa9e4066Sahrens return; 354fa9e4066Sahrens 355bc9014e6SJustin Gibbs dbuf_verify_user(db, DBVU_EVICTING); 356bc9014e6SJustin Gibbs db->db_user = NULL; 357bc9014e6SJustin Gibbs 358bc9014e6SJustin Gibbs #ifdef ZFS_DEBUG 359bc9014e6SJustin Gibbs if (dbu->dbu_clear_on_evict_dbufp != NULL) 360bc9014e6SJustin Gibbs *dbu->dbu_clear_on_evict_dbufp = NULL; 361bc9014e6SJustin Gibbs #endif 362bc9014e6SJustin Gibbs 363bc9014e6SJustin Gibbs /* 364bc9014e6SJustin Gibbs * Invoke the callback from a taskq to avoid lock order reversals 365bc9014e6SJustin Gibbs * and limit stack depth. 366bc9014e6SJustin Gibbs */ 367bc9014e6SJustin Gibbs taskq_dispatch_ent(dbu_evict_taskq, dbu->dbu_evict_func, dbu, 0, 368bc9014e6SJustin Gibbs &dbu->dbu_tqent); 369fa9e4066Sahrens } 370fa9e4066Sahrens 371744947dcSTom Erickson boolean_t 372744947dcSTom Erickson dbuf_is_metadata(dmu_buf_impl_t *db) 373744947dcSTom Erickson { 374744947dcSTom Erickson if (db->db_level > 0) { 375744947dcSTom Erickson return (B_TRUE); 376744947dcSTom Erickson } else { 377744947dcSTom Erickson boolean_t is_metadata; 378744947dcSTom Erickson 379744947dcSTom Erickson DB_DNODE_ENTER(db); 380ad135b5dSChristopher Siden is_metadata = DMU_OT_IS_METADATA(DB_DNODE(db)->dn_type); 381744947dcSTom Erickson DB_DNODE_EXIT(db); 382744947dcSTom Erickson 383744947dcSTom Erickson return (is_metadata); 384744947dcSTom Erickson } 385744947dcSTom Erickson } 386744947dcSTom Erickson 387dcbf3bd6SGeorge Wilson /* 388dcbf3bd6SGeorge Wilson * This function *must* return indices evenly distributed between all 389dcbf3bd6SGeorge Wilson * sublists of the multilist. This is needed due to how the dbuf eviction 390dcbf3bd6SGeorge Wilson * code is laid out; dbuf_evict_thread() assumes dbufs are evenly 391dcbf3bd6SGeorge Wilson * distributed between all sublists and uses this assumption when 392dcbf3bd6SGeorge Wilson * deciding which sublist to evict from and how much to evict from it. 393dcbf3bd6SGeorge Wilson */ 394dcbf3bd6SGeorge Wilson unsigned int 395dcbf3bd6SGeorge Wilson dbuf_cache_multilist_index_func(multilist_t *ml, void *obj) 396ea8dc4b6Seschrock { 397dcbf3bd6SGeorge Wilson dmu_buf_impl_t *db = obj; 398ea8dc4b6Seschrock 399dcbf3bd6SGeorge Wilson /* 400dcbf3bd6SGeorge Wilson * The assumption here, is the hash value for a given 401dcbf3bd6SGeorge Wilson * dmu_buf_impl_t will remain constant throughout it's lifetime 402dcbf3bd6SGeorge Wilson * (i.e. it's objset, object, level and blkid fields don't change). 403dcbf3bd6SGeorge Wilson * Thus, we don't need to store the dbuf's sublist index 404dcbf3bd6SGeorge Wilson * on insertion, as this index can be recalculated on removal. 405dcbf3bd6SGeorge Wilson * 406dcbf3bd6SGeorge Wilson * Also, the low order bits of the hash value are thought to be 407dcbf3bd6SGeorge Wilson * distributed evenly. Otherwise, in the case that the multilist 408dcbf3bd6SGeorge Wilson * has a power of two number of sublists, each sublists' usage 409dcbf3bd6SGeorge Wilson * would not be evenly distributed. 410dcbf3bd6SGeorge Wilson */ 411dcbf3bd6SGeorge Wilson return (dbuf_hash(db->db_objset, db->db.db_object, 412dcbf3bd6SGeorge Wilson db->db_level, db->db_blkid) % 413dcbf3bd6SGeorge Wilson multilist_get_num_sublists(ml)); 414dcbf3bd6SGeorge Wilson } 415dcbf3bd6SGeorge Wilson 416dcbf3bd6SGeorge Wilson static inline boolean_t 417dcbf3bd6SGeorge Wilson dbuf_cache_above_hiwater(void) 418dcbf3bd6SGeorge Wilson { 419dcbf3bd6SGeorge Wilson uint64_t dbuf_cache_hiwater_bytes = 420dcbf3bd6SGeorge Wilson (dbuf_cache_max_bytes * dbuf_cache_hiwater_pct) / 100; 421dcbf3bd6SGeorge Wilson 422dcbf3bd6SGeorge Wilson return (refcount_count(&dbuf_cache_size) > 423dcbf3bd6SGeorge Wilson dbuf_cache_max_bytes + dbuf_cache_hiwater_bytes); 424dcbf3bd6SGeorge Wilson } 425dcbf3bd6SGeorge Wilson 426dcbf3bd6SGeorge Wilson static inline boolean_t 427dcbf3bd6SGeorge Wilson dbuf_cache_above_lowater(void) 428dcbf3bd6SGeorge Wilson { 429dcbf3bd6SGeorge Wilson uint64_t dbuf_cache_lowater_bytes = 430dcbf3bd6SGeorge Wilson (dbuf_cache_max_bytes * dbuf_cache_lowater_pct) / 100; 431dcbf3bd6SGeorge Wilson 432dcbf3bd6SGeorge Wilson return (refcount_count(&dbuf_cache_size) > 433dcbf3bd6SGeorge Wilson dbuf_cache_max_bytes - dbuf_cache_lowater_bytes); 434dcbf3bd6SGeorge Wilson } 435dcbf3bd6SGeorge Wilson 436dcbf3bd6SGeorge Wilson /* 437dcbf3bd6SGeorge Wilson * Evict the oldest eligible dbuf from the dbuf cache. 438dcbf3bd6SGeorge Wilson */ 439dcbf3bd6SGeorge Wilson static void 440dcbf3bd6SGeorge Wilson dbuf_evict_one(void) 441dcbf3bd6SGeorge Wilson { 442dcbf3bd6SGeorge Wilson int idx = multilist_get_random_index(&dbuf_cache); 443dcbf3bd6SGeorge Wilson multilist_sublist_t *mls = multilist_sublist_lock(&dbuf_cache, idx); 444dcbf3bd6SGeorge Wilson 445dcbf3bd6SGeorge Wilson ASSERT(!MUTEX_HELD(&dbuf_evict_lock)); 446dcbf3bd6SGeorge Wilson 447dcbf3bd6SGeorge Wilson /* 448dcbf3bd6SGeorge Wilson * Set the thread's tsd to indicate that it's processing evictions. 449dcbf3bd6SGeorge Wilson * Once a thread stops evicting from the dbuf cache it will 450dcbf3bd6SGeorge Wilson * reset its tsd to NULL. 451dcbf3bd6SGeorge Wilson */ 452dcbf3bd6SGeorge Wilson ASSERT3P(tsd_get(zfs_dbuf_evict_key), ==, NULL); 453dcbf3bd6SGeorge Wilson (void) tsd_set(zfs_dbuf_evict_key, (void *)B_TRUE); 454dcbf3bd6SGeorge Wilson 455dcbf3bd6SGeorge Wilson dmu_buf_impl_t *db = multilist_sublist_tail(mls); 456dcbf3bd6SGeorge Wilson while (db != NULL && mutex_tryenter(&db->db_mtx) == 0) { 457dcbf3bd6SGeorge Wilson db = multilist_sublist_prev(mls, db); 458dcbf3bd6SGeorge Wilson } 459dcbf3bd6SGeorge Wilson 460dcbf3bd6SGeorge Wilson DTRACE_PROBE2(dbuf__evict__one, dmu_buf_impl_t *, db, 461dcbf3bd6SGeorge Wilson multilist_sublist_t *, mls); 462dcbf3bd6SGeorge Wilson 463dcbf3bd6SGeorge Wilson if (db != NULL) { 464dcbf3bd6SGeorge Wilson multilist_sublist_remove(mls, db); 465dcbf3bd6SGeorge Wilson multilist_sublist_unlock(mls); 466dcbf3bd6SGeorge Wilson (void) refcount_remove_many(&dbuf_cache_size, 467dcbf3bd6SGeorge Wilson db->db.db_size, db); 468ea8dc4b6Seschrock dbuf_destroy(db); 469dcbf3bd6SGeorge Wilson } else { 470dcbf3bd6SGeorge Wilson multilist_sublist_unlock(mls); 471dcbf3bd6SGeorge Wilson } 472dcbf3bd6SGeorge Wilson (void) tsd_set(zfs_dbuf_evict_key, NULL); 473dcbf3bd6SGeorge Wilson } 474dcbf3bd6SGeorge Wilson 475dcbf3bd6SGeorge Wilson /* 476dcbf3bd6SGeorge Wilson * The dbuf evict thread is responsible for aging out dbufs from the 477dcbf3bd6SGeorge Wilson * cache. Once the cache has reached it's maximum size, dbufs are removed 478dcbf3bd6SGeorge Wilson * and destroyed. The eviction thread will continue running until the size 479dcbf3bd6SGeorge Wilson * of the dbuf cache is at or below the maximum size. Once the dbuf is aged 480dcbf3bd6SGeorge Wilson * out of the cache it is destroyed and becomes eligible for arc eviction. 481dcbf3bd6SGeorge Wilson */ 482dcbf3bd6SGeorge Wilson static void 483dcbf3bd6SGeorge Wilson dbuf_evict_thread(void) 484dcbf3bd6SGeorge Wilson { 485dcbf3bd6SGeorge Wilson callb_cpr_t cpr; 486dcbf3bd6SGeorge Wilson 487dcbf3bd6SGeorge Wilson CALLB_CPR_INIT(&cpr, &dbuf_evict_lock, callb_generic_cpr, FTAG); 488dcbf3bd6SGeorge Wilson 489dcbf3bd6SGeorge Wilson mutex_enter(&dbuf_evict_lock); 490dcbf3bd6SGeorge Wilson while (!dbuf_evict_thread_exit) { 491dcbf3bd6SGeorge Wilson while (!dbuf_cache_above_lowater() && !dbuf_evict_thread_exit) { 492dcbf3bd6SGeorge Wilson CALLB_CPR_SAFE_BEGIN(&cpr); 493dcbf3bd6SGeorge Wilson (void) cv_timedwait_hires(&dbuf_evict_cv, 494dcbf3bd6SGeorge Wilson &dbuf_evict_lock, SEC2NSEC(1), MSEC2NSEC(1), 0); 495dcbf3bd6SGeorge Wilson CALLB_CPR_SAFE_END(&cpr, &dbuf_evict_lock); 496dcbf3bd6SGeorge Wilson } 497dcbf3bd6SGeorge Wilson mutex_exit(&dbuf_evict_lock); 498dcbf3bd6SGeorge Wilson 499dcbf3bd6SGeorge Wilson /* 500dcbf3bd6SGeorge Wilson * Keep evicting as long as we're above the low water mark 501dcbf3bd6SGeorge Wilson * for the cache. We do this without holding the locks to 502dcbf3bd6SGeorge Wilson * minimize lock contention. 503dcbf3bd6SGeorge Wilson */ 504dcbf3bd6SGeorge Wilson while (dbuf_cache_above_lowater() && !dbuf_evict_thread_exit) { 505dcbf3bd6SGeorge Wilson dbuf_evict_one(); 506dcbf3bd6SGeorge Wilson } 507dcbf3bd6SGeorge Wilson 508dcbf3bd6SGeorge Wilson mutex_enter(&dbuf_evict_lock); 509dcbf3bd6SGeorge Wilson } 510dcbf3bd6SGeorge Wilson 511dcbf3bd6SGeorge Wilson dbuf_evict_thread_exit = B_FALSE; 512dcbf3bd6SGeorge Wilson cv_broadcast(&dbuf_evict_cv); 513dcbf3bd6SGeorge Wilson CALLB_CPR_EXIT(&cpr); /* drops dbuf_evict_lock */ 514dcbf3bd6SGeorge Wilson thread_exit(); 515dcbf3bd6SGeorge Wilson } 516dcbf3bd6SGeorge Wilson 517dcbf3bd6SGeorge Wilson /* 518dcbf3bd6SGeorge Wilson * Wake up the dbuf eviction thread if the dbuf cache is at its max size. 519dcbf3bd6SGeorge Wilson * If the dbuf cache is at its high water mark, then evict a dbuf from the 520dcbf3bd6SGeorge Wilson * dbuf cache using the callers context. 521dcbf3bd6SGeorge Wilson */ 522dcbf3bd6SGeorge Wilson static void 523dcbf3bd6SGeorge Wilson dbuf_evict_notify(void) 524dcbf3bd6SGeorge Wilson { 525dcbf3bd6SGeorge Wilson 526dcbf3bd6SGeorge Wilson /* 527dcbf3bd6SGeorge Wilson * We use thread specific data to track when a thread has 528dcbf3bd6SGeorge Wilson * started processing evictions. This allows us to avoid deeply 529dcbf3bd6SGeorge Wilson * nested stacks that would have a call flow similar to this: 530dcbf3bd6SGeorge Wilson * 531dcbf3bd6SGeorge Wilson * dbuf_rele()-->dbuf_rele_and_unlock()-->dbuf_evict_notify() 532dcbf3bd6SGeorge Wilson * ^ | 533dcbf3bd6SGeorge Wilson * | | 534dcbf3bd6SGeorge Wilson * +-----dbuf_destroy()<--dbuf_evict_one()<--------+ 535dcbf3bd6SGeorge Wilson * 536dcbf3bd6SGeorge Wilson * The dbuf_eviction_thread will always have its tsd set until 537dcbf3bd6SGeorge Wilson * that thread exits. All other threads will only set their tsd 538dcbf3bd6SGeorge Wilson * if they are participating in the eviction process. This only 539dcbf3bd6SGeorge Wilson * happens if the eviction thread is unable to process evictions 540dcbf3bd6SGeorge Wilson * fast enough. To keep the dbuf cache size in check, other threads 541dcbf3bd6SGeorge Wilson * can evict from the dbuf cache directly. Those threads will set 542dcbf3bd6SGeorge Wilson * their tsd values so that we ensure that they only evict one dbuf 543dcbf3bd6SGeorge Wilson * from the dbuf cache. 544dcbf3bd6SGeorge Wilson */ 545dcbf3bd6SGeorge Wilson if (tsd_get(zfs_dbuf_evict_key) != NULL) 546dcbf3bd6SGeorge Wilson return; 547dcbf3bd6SGeorge Wilson 548dcbf3bd6SGeorge Wilson if (refcount_count(&dbuf_cache_size) > dbuf_cache_max_bytes) { 549dcbf3bd6SGeorge Wilson boolean_t evict_now = B_FALSE; 550dcbf3bd6SGeorge Wilson 551dcbf3bd6SGeorge Wilson mutex_enter(&dbuf_evict_lock); 552dcbf3bd6SGeorge Wilson if (refcount_count(&dbuf_cache_size) > dbuf_cache_max_bytes) { 553dcbf3bd6SGeorge Wilson evict_now = dbuf_cache_above_hiwater(); 554dcbf3bd6SGeorge Wilson cv_signal(&dbuf_evict_cv); 555dcbf3bd6SGeorge Wilson } 556dcbf3bd6SGeorge Wilson mutex_exit(&dbuf_evict_lock); 557dcbf3bd6SGeorge Wilson 558dcbf3bd6SGeorge Wilson if (evict_now) { 559dcbf3bd6SGeorge Wilson dbuf_evict_one(); 560dcbf3bd6SGeorge Wilson } 561dcbf3bd6SGeorge Wilson } 562ea8dc4b6Seschrock } 563ea8dc4b6Seschrock 564ea8dc4b6Seschrock void 565fa9e4066Sahrens dbuf_init(void) 566fa9e4066Sahrens { 567ea8dc4b6Seschrock uint64_t hsize = 1ULL << 16; 568fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 569fa9e4066Sahrens int i; 570fa9e4066Sahrens 571fa9e4066Sahrens /* 572fa9e4066Sahrens * The hash table is big enough to fill all of physical memory 573ea8dc4b6Seschrock * with an average 4K block size. The table will take up 574ea8dc4b6Seschrock * totalmem*sizeof(void*)/4K (i.e. 2MB/GB with 8-byte pointers). 575fa9e4066Sahrens */ 576ea8dc4b6Seschrock while (hsize * 4096 < physmem * PAGESIZE) 577fa9e4066Sahrens hsize <<= 1; 578fa9e4066Sahrens 579ea8dc4b6Seschrock retry: 580fa9e4066Sahrens h->hash_table_mask = hsize - 1; 581ea8dc4b6Seschrock h->hash_table = kmem_zalloc(hsize * sizeof (void *), KM_NOSLEEP); 582ea8dc4b6Seschrock if (h->hash_table == NULL) { 583ea8dc4b6Seschrock /* XXX - we should really return an error instead of assert */ 584ea8dc4b6Seschrock ASSERT(hsize > (1ULL << 10)); 585ea8dc4b6Seschrock hsize >>= 1; 586ea8dc4b6Seschrock goto retry; 587ea8dc4b6Seschrock } 588fa9e4066Sahrens 589dcbf3bd6SGeorge Wilson dbuf_kmem_cache = kmem_cache_create("dmu_buf_impl_t", 590fa9e4066Sahrens sizeof (dmu_buf_impl_t), 591fa9e4066Sahrens 0, dbuf_cons, dbuf_dest, NULL, NULL, NULL, 0); 592fa9e4066Sahrens 593fa9e4066Sahrens for (i = 0; i < DBUF_MUTEXES; i++) 594fa9e4066Sahrens mutex_init(&h->hash_mutexes[i], NULL, MUTEX_DEFAULT, NULL); 595bc9014e6SJustin Gibbs 596bc9014e6SJustin Gibbs /* 597dcbf3bd6SGeorge Wilson * Setup the parameters for the dbuf cache. We cap the size of the 598dcbf3bd6SGeorge Wilson * dbuf cache to 1/32nd (default) of the size of the ARC. 599dcbf3bd6SGeorge Wilson */ 600dcbf3bd6SGeorge Wilson dbuf_cache_max_bytes = MIN(dbuf_cache_max_bytes, 601dcbf3bd6SGeorge Wilson arc_max_bytes() >> dbuf_cache_max_shift); 602dcbf3bd6SGeorge Wilson 603dcbf3bd6SGeorge Wilson /* 604bc9014e6SJustin Gibbs * All entries are queued via taskq_dispatch_ent(), so min/maxalloc 605bc9014e6SJustin Gibbs * configuration is not required. 606bc9014e6SJustin Gibbs */ 607bc9014e6SJustin Gibbs dbu_evict_taskq = taskq_create("dbu_evict", 1, minclsyspri, 0, 0, 0); 608dcbf3bd6SGeorge Wilson 609dcbf3bd6SGeorge Wilson multilist_create(&dbuf_cache, sizeof (dmu_buf_impl_t), 610dcbf3bd6SGeorge Wilson offsetof(dmu_buf_impl_t, db_cache_link), 611dcbf3bd6SGeorge Wilson zfs_arc_num_sublists_per_state, 612dcbf3bd6SGeorge Wilson dbuf_cache_multilist_index_func); 613dcbf3bd6SGeorge Wilson refcount_create(&dbuf_cache_size); 614dcbf3bd6SGeorge Wilson 615dcbf3bd6SGeorge Wilson tsd_create(&zfs_dbuf_evict_key, NULL); 616dcbf3bd6SGeorge Wilson dbuf_evict_thread_exit = B_FALSE; 617dcbf3bd6SGeorge Wilson mutex_init(&dbuf_evict_lock, NULL, MUTEX_DEFAULT, NULL); 618dcbf3bd6SGeorge Wilson cv_init(&dbuf_evict_cv, NULL, CV_DEFAULT, NULL); 619dcbf3bd6SGeorge Wilson dbuf_cache_evict_thread = thread_create(NULL, 0, dbuf_evict_thread, 620dcbf3bd6SGeorge Wilson NULL, 0, &p0, TS_RUN, minclsyspri); 621fa9e4066Sahrens } 622fa9e4066Sahrens 623fa9e4066Sahrens void 624fa9e4066Sahrens dbuf_fini(void) 625fa9e4066Sahrens { 626fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 627fa9e4066Sahrens int i; 628fa9e4066Sahrens 629fa9e4066Sahrens for (i = 0; i < DBUF_MUTEXES; i++) 630fa9e4066Sahrens mutex_destroy(&h->hash_mutexes[i]); 631fa9e4066Sahrens kmem_free(h->hash_table, (h->hash_table_mask + 1) * sizeof (void *)); 632dcbf3bd6SGeorge Wilson kmem_cache_destroy(dbuf_kmem_cache); 633bc9014e6SJustin Gibbs taskq_destroy(dbu_evict_taskq); 634dcbf3bd6SGeorge Wilson 635dcbf3bd6SGeorge Wilson mutex_enter(&dbuf_evict_lock); 636dcbf3bd6SGeorge Wilson dbuf_evict_thread_exit = B_TRUE; 637dcbf3bd6SGeorge Wilson while (dbuf_evict_thread_exit) { 638dcbf3bd6SGeorge Wilson cv_signal(&dbuf_evict_cv); 639dcbf3bd6SGeorge Wilson cv_wait(&dbuf_evict_cv, &dbuf_evict_lock); 640dcbf3bd6SGeorge Wilson } 641dcbf3bd6SGeorge Wilson mutex_exit(&dbuf_evict_lock); 642dcbf3bd6SGeorge Wilson tsd_destroy(&zfs_dbuf_evict_key); 643dcbf3bd6SGeorge Wilson 644dcbf3bd6SGeorge Wilson mutex_destroy(&dbuf_evict_lock); 645dcbf3bd6SGeorge Wilson cv_destroy(&dbuf_evict_cv); 646dcbf3bd6SGeorge Wilson 647dcbf3bd6SGeorge Wilson refcount_destroy(&dbuf_cache_size); 648dcbf3bd6SGeorge Wilson multilist_destroy(&dbuf_cache); 649fa9e4066Sahrens } 650fa9e4066Sahrens 651fa9e4066Sahrens /* 652fa9e4066Sahrens * Other stuff. 653fa9e4066Sahrens */ 654fa9e4066Sahrens 6559c9dc39aSek110237 #ifdef ZFS_DEBUG 656fa9e4066Sahrens static void 657fa9e4066Sahrens dbuf_verify(dmu_buf_impl_t *db) 658fa9e4066Sahrens { 659744947dcSTom Erickson dnode_t *dn; 660b24ab676SJeff Bonwick dbuf_dirty_record_t *dr; 661fa9e4066Sahrens 662fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 663fa9e4066Sahrens 664fa9e4066Sahrens if (!(zfs_flags & ZFS_DEBUG_DBUF_VERIFY)) 665fa9e4066Sahrens return; 666fa9e4066Sahrens 667fa9e4066Sahrens ASSERT(db->db_objset != NULL); 668744947dcSTom Erickson DB_DNODE_ENTER(db); 669744947dcSTom Erickson dn = DB_DNODE(db); 670fa9e4066Sahrens if (dn == NULL) { 671fa9e4066Sahrens ASSERT(db->db_parent == NULL); 672fa9e4066Sahrens ASSERT(db->db_blkptr == NULL); 673fa9e4066Sahrens } else { 674fa9e4066Sahrens ASSERT3U(db->db.db_object, ==, dn->dn_object); 675fa9e4066Sahrens ASSERT3P(db->db_objset, ==, dn->dn_objset); 676fa9e4066Sahrens ASSERT3U(db->db_level, <, dn->dn_nlevels); 677744947dcSTom Erickson ASSERT(db->db_blkid == DMU_BONUS_BLKID || 678744947dcSTom Erickson db->db_blkid == DMU_SPILL_BLKID || 6790f6d88adSAlex Reece !avl_is_empty(&dn->dn_dbufs)); 680fa9e4066Sahrens } 6810a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 682fa9e4066Sahrens ASSERT(dn != NULL); 6831934e92fSmaybee ASSERT3U(db->db.db_size, >=, dn->dn_bonuslen); 6840a586ceaSMark Shellenbaum ASSERT3U(db->db.db_offset, ==, DMU_BONUS_BLKID); 6850a586ceaSMark Shellenbaum } else if (db->db_blkid == DMU_SPILL_BLKID) { 6860a586ceaSMark Shellenbaum ASSERT(dn != NULL); 6870a586ceaSMark Shellenbaum ASSERT3U(db->db.db_size, >=, dn->dn_bonuslen); 688fb09f5aaSMadhav Suresh ASSERT0(db->db.db_offset); 689fa9e4066Sahrens } else { 690fa9e4066Sahrens ASSERT3U(db->db.db_offset, ==, db->db_blkid * db->db.db_size); 691fa9e4066Sahrens } 692fa9e4066Sahrens 693b24ab676SJeff Bonwick for (dr = db->db_data_pending; dr != NULL; dr = dr->dr_next) 694b24ab676SJeff Bonwick ASSERT(dr->dr_dbuf == db); 695b24ab676SJeff Bonwick 696b24ab676SJeff Bonwick for (dr = db->db_last_dirty; dr != NULL; dr = dr->dr_next) 697b24ab676SJeff Bonwick ASSERT(dr->dr_dbuf == db); 698b24ab676SJeff Bonwick 69988b7b0f2SMatthew Ahrens /* 70088b7b0f2SMatthew Ahrens * We can't assert that db_size matches dn_datablksz because it 70188b7b0f2SMatthew Ahrens * can be momentarily different when another thread is doing 70288b7b0f2SMatthew Ahrens * dnode_set_blksz(). 70388b7b0f2SMatthew Ahrens */ 70488b7b0f2SMatthew Ahrens if (db->db_level == 0 && db->db.db_object == DMU_META_DNODE_OBJECT) { 705b24ab676SJeff Bonwick dr = db->db_data_pending; 706fa9e4066Sahrens /* 70788b7b0f2SMatthew Ahrens * It should only be modified in syncing context, so 70888b7b0f2SMatthew Ahrens * make sure we only have one copy of the data. 709fa9e4066Sahrens */ 710c717a561Smaybee ASSERT(dr == NULL || dr->dt.dl.dr_data == db->db_buf); 711fa9e4066Sahrens } 712fa9e4066Sahrens 713fa9e4066Sahrens /* verify db->db_blkptr */ 714fa9e4066Sahrens if (db->db_blkptr) { 715fa9e4066Sahrens if (db->db_parent == dn->dn_dbuf) { 716fa9e4066Sahrens /* db is pointed to by the dnode */ 717fa9e4066Sahrens /* ASSERT3U(db->db_blkid, <, dn->dn_nblkptr); */ 71814843421SMatthew Ahrens if (DMU_OBJECT_IS_SPECIAL(db->db.db_object)) 719fa9e4066Sahrens ASSERT(db->db_parent == NULL); 720fa9e4066Sahrens else 721fa9e4066Sahrens ASSERT(db->db_parent != NULL); 7220a586ceaSMark Shellenbaum if (db->db_blkid != DMU_SPILL_BLKID) 723fa9e4066Sahrens ASSERT3P(db->db_blkptr, ==, 724fa9e4066Sahrens &dn->dn_phys->dn_blkptr[db->db_blkid]); 725fa9e4066Sahrens } else { 726fa9e4066Sahrens /* db is pointed to by an indirect block */ 727fa9e4066Sahrens int epb = db->db_parent->db.db_size >> SPA_BLKPTRSHIFT; 728fa9e4066Sahrens ASSERT3U(db->db_parent->db_level, ==, db->db_level+1); 729fa9e4066Sahrens ASSERT3U(db->db_parent->db.db_object, ==, 730fa9e4066Sahrens db->db.db_object); 731fa9e4066Sahrens /* 732fa9e4066Sahrens * dnode_grow_indblksz() can make this fail if we don't 733fa9e4066Sahrens * have the struct_rwlock. XXX indblksz no longer 734fa9e4066Sahrens * grows. safe to do this now? 735fa9e4066Sahrens */ 736744947dcSTom Erickson if (RW_WRITE_HELD(&dn->dn_struct_rwlock)) { 737fa9e4066Sahrens ASSERT3P(db->db_blkptr, ==, 738fa9e4066Sahrens ((blkptr_t *)db->db_parent->db.db_data + 739fa9e4066Sahrens db->db_blkid % epb)); 740fa9e4066Sahrens } 741fa9e4066Sahrens } 742fa9e4066Sahrens } 743fa9e4066Sahrens if ((db->db_blkptr == NULL || BP_IS_HOLE(db->db_blkptr)) && 7443f9d6ad7SLin Ling (db->db_buf == NULL || db->db_buf->b_data) && 7450a586ceaSMark Shellenbaum db->db.db_data && db->db_blkid != DMU_BONUS_BLKID && 746fa9e4066Sahrens db->db_state != DB_FILL && !dn->dn_free_txg) { 747fa9e4066Sahrens /* 748fa9e4066Sahrens * If the blkptr isn't set but they have nonzero data, 749fa9e4066Sahrens * it had better be dirty, otherwise we'll lose that 750fa9e4066Sahrens * data when we evict this buffer. 7518df0bcf0SPaul Dagnelie * 7528df0bcf0SPaul Dagnelie * There is an exception to this rule for indirect blocks; in 7538df0bcf0SPaul Dagnelie * this case, if the indirect block is a hole, we fill in a few 7548df0bcf0SPaul Dagnelie * fields on each of the child blocks (importantly, birth time) 7558df0bcf0SPaul Dagnelie * to prevent hole birth times from being lost when you 7568df0bcf0SPaul Dagnelie * partially fill in a hole. 757fa9e4066Sahrens */ 758fa9e4066Sahrens if (db->db_dirtycnt == 0) { 7598df0bcf0SPaul Dagnelie if (db->db_level == 0) { 760fa9e4066Sahrens uint64_t *buf = db->db.db_data; 761fa9e4066Sahrens int i; 762fa9e4066Sahrens 763fa9e4066Sahrens for (i = 0; i < db->db.db_size >> 3; i++) { 764fa9e4066Sahrens ASSERT(buf[i] == 0); 765fa9e4066Sahrens } 7668df0bcf0SPaul Dagnelie } else { 7678df0bcf0SPaul Dagnelie blkptr_t *bps = db->db.db_data; 7688df0bcf0SPaul Dagnelie ASSERT3U(1 << DB_DNODE(db)->dn_indblkshift, ==, 7698df0bcf0SPaul Dagnelie db->db.db_size); 7708df0bcf0SPaul Dagnelie /* 7718df0bcf0SPaul Dagnelie * We want to verify that all the blkptrs in the 7728df0bcf0SPaul Dagnelie * indirect block are holes, but we may have 7738df0bcf0SPaul Dagnelie * automatically set up a few fields for them. 7748df0bcf0SPaul Dagnelie * We iterate through each blkptr and verify 7758df0bcf0SPaul Dagnelie * they only have those fields set. 7768df0bcf0SPaul Dagnelie */ 7778df0bcf0SPaul Dagnelie for (int i = 0; 7788df0bcf0SPaul Dagnelie i < db->db.db_size / sizeof (blkptr_t); 7798df0bcf0SPaul Dagnelie i++) { 7808df0bcf0SPaul Dagnelie blkptr_t *bp = &bps[i]; 7818df0bcf0SPaul Dagnelie ASSERT(ZIO_CHECKSUM_IS_ZERO( 7828df0bcf0SPaul Dagnelie &bp->blk_cksum)); 7838df0bcf0SPaul Dagnelie ASSERT( 7848df0bcf0SPaul Dagnelie DVA_IS_EMPTY(&bp->blk_dva[0]) && 7858df0bcf0SPaul Dagnelie DVA_IS_EMPTY(&bp->blk_dva[1]) && 7868df0bcf0SPaul Dagnelie DVA_IS_EMPTY(&bp->blk_dva[2])); 7878df0bcf0SPaul Dagnelie ASSERT0(bp->blk_fill); 7888df0bcf0SPaul Dagnelie ASSERT0(bp->blk_pad[0]); 7898df0bcf0SPaul Dagnelie ASSERT0(bp->blk_pad[1]); 7908df0bcf0SPaul Dagnelie ASSERT(!BP_IS_EMBEDDED(bp)); 7918df0bcf0SPaul Dagnelie ASSERT(BP_IS_HOLE(bp)); 7928df0bcf0SPaul Dagnelie ASSERT0(bp->blk_phys_birth); 7938df0bcf0SPaul Dagnelie } 7948df0bcf0SPaul Dagnelie } 795fa9e4066Sahrens } 796fa9e4066Sahrens } 797744947dcSTom Erickson DB_DNODE_EXIT(db); 798fa9e4066Sahrens } 7999c9dc39aSek110237 #endif 800fa9e4066Sahrens 801fa9e4066Sahrens static void 802bc9014e6SJustin Gibbs dbuf_clear_data(dmu_buf_impl_t *db) 803fa9e4066Sahrens { 804fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 805ea8dc4b6Seschrock dbuf_evict_user(db); 806dcbf3bd6SGeorge Wilson ASSERT3P(db->db_buf, ==, NULL); 807ea8dc4b6Seschrock db->db.db_data = NULL; 80882c9918fSTim Haley if (db->db_state != DB_NOFILL) 809ea8dc4b6Seschrock db->db_state = DB_UNCACHED; 810ea8dc4b6Seschrock } 811bc9014e6SJustin Gibbs 812bc9014e6SJustin Gibbs static void 813bc9014e6SJustin Gibbs dbuf_set_data(dmu_buf_impl_t *db, arc_buf_t *buf) 814bc9014e6SJustin Gibbs { 815bc9014e6SJustin Gibbs ASSERT(MUTEX_HELD(&db->db_mtx)); 816bc9014e6SJustin Gibbs ASSERT(buf != NULL); 817bc9014e6SJustin Gibbs 818bc9014e6SJustin Gibbs db->db_buf = buf; 819bc9014e6SJustin Gibbs ASSERT(buf->b_data != NULL); 820bc9014e6SJustin Gibbs db->db.db_data = buf->b_data; 821fa9e4066Sahrens } 822fa9e4066Sahrens 823c242f9a0Schunli zhang - Sun Microsystems - Irvine United States /* 824c242f9a0Schunli zhang - Sun Microsystems - Irvine United States * Loan out an arc_buf for read. Return the loaned arc_buf. 825c242f9a0Schunli zhang - Sun Microsystems - Irvine United States */ 826c242f9a0Schunli zhang - Sun Microsystems - Irvine United States arc_buf_t * 827c242f9a0Schunli zhang - Sun Microsystems - Irvine United States dbuf_loan_arcbuf(dmu_buf_impl_t *db) 828c242f9a0Schunli zhang - Sun Microsystems - Irvine United States { 829c242f9a0Schunli zhang - Sun Microsystems - Irvine United States arc_buf_t *abuf; 830c242f9a0Schunli zhang - Sun Microsystems - Irvine United States 831dcbf3bd6SGeorge Wilson ASSERT(db->db_blkid != DMU_BONUS_BLKID); 832c242f9a0Schunli zhang - Sun Microsystems - Irvine United States mutex_enter(&db->db_mtx); 833c242f9a0Schunli zhang - Sun Microsystems - Irvine United States if (arc_released(db->db_buf) || refcount_count(&db->db_holds) > 1) { 834c242f9a0Schunli zhang - Sun Microsystems - Irvine United States int blksz = db->db.db_size; 83543466aaeSMax Grossman spa_t *spa = db->db_objset->os_spa; 836744947dcSTom Erickson 837c242f9a0Schunli zhang - Sun Microsystems - Irvine United States mutex_exit(&db->db_mtx); 838744947dcSTom Erickson abuf = arc_loan_buf(spa, blksz); 839c242f9a0Schunli zhang - Sun Microsystems - Irvine United States bcopy(db->db.db_data, abuf->b_data, blksz); 840c242f9a0Schunli zhang - Sun Microsystems - Irvine United States } else { 841c242f9a0Schunli zhang - Sun Microsystems - Irvine United States abuf = db->db_buf; 842c242f9a0Schunli zhang - Sun Microsystems - Irvine United States arc_loan_inuse_buf(abuf, db); 843dcbf3bd6SGeorge Wilson db->db_buf = NULL; 844bc9014e6SJustin Gibbs dbuf_clear_data(db); 845c242f9a0Schunli zhang - Sun Microsystems - Irvine United States mutex_exit(&db->db_mtx); 846c242f9a0Schunli zhang - Sun Microsystems - Irvine United States } 847c242f9a0Schunli zhang - Sun Microsystems - Irvine United States return (abuf); 848c242f9a0Schunli zhang - Sun Microsystems - Irvine United States } 849c242f9a0Schunli zhang - Sun Microsystems - Irvine United States 850a2cdcdd2SPaul Dagnelie /* 851a2cdcdd2SPaul Dagnelie * Calculate which level n block references the data at the level 0 offset 852a2cdcdd2SPaul Dagnelie * provided. 853a2cdcdd2SPaul Dagnelie */ 854fa9e4066Sahrens uint64_t 855a2cdcdd2SPaul Dagnelie dbuf_whichblock(dnode_t *dn, int64_t level, uint64_t offset) 856fa9e4066Sahrens { 857a2cdcdd2SPaul Dagnelie if (dn->dn_datablkshift != 0 && dn->dn_indblkshift != 0) { 858a2cdcdd2SPaul Dagnelie /* 859a2cdcdd2SPaul Dagnelie * The level n blkid is equal to the level 0 blkid divided by 860a2cdcdd2SPaul Dagnelie * the number of level 0s in a level n block. 861a2cdcdd2SPaul Dagnelie * 862a2cdcdd2SPaul Dagnelie * The level 0 blkid is offset >> datablkshift = 863a2cdcdd2SPaul Dagnelie * offset / 2^datablkshift. 864a2cdcdd2SPaul Dagnelie * 865a2cdcdd2SPaul Dagnelie * The number of level 0s in a level n is the number of block 866a2cdcdd2SPaul Dagnelie * pointers in an indirect block, raised to the power of level. 867a2cdcdd2SPaul Dagnelie * This is 2^(indblkshift - SPA_BLKPTRSHIFT)^level = 868a2cdcdd2SPaul Dagnelie * 2^(level*(indblkshift - SPA_BLKPTRSHIFT)). 869a2cdcdd2SPaul Dagnelie * 870a2cdcdd2SPaul Dagnelie * Thus, the level n blkid is: offset / 871a2cdcdd2SPaul Dagnelie * ((2^datablkshift)*(2^(level*(indblkshift - SPA_BLKPTRSHIFT))) 872a2cdcdd2SPaul Dagnelie * = offset / 2^(datablkshift + level * 873a2cdcdd2SPaul Dagnelie * (indblkshift - SPA_BLKPTRSHIFT)) 874a2cdcdd2SPaul Dagnelie * = offset >> (datablkshift + level * 875a2cdcdd2SPaul Dagnelie * (indblkshift - SPA_BLKPTRSHIFT)) 876a2cdcdd2SPaul Dagnelie */ 877a2cdcdd2SPaul Dagnelie return (offset >> (dn->dn_datablkshift + level * 878a2cdcdd2SPaul Dagnelie (dn->dn_indblkshift - SPA_BLKPTRSHIFT))); 879fa9e4066Sahrens } else { 880fa9e4066Sahrens ASSERT3U(offset, <, dn->dn_datablksz); 881fa9e4066Sahrens return (0); 882fa9e4066Sahrens } 883fa9e4066Sahrens } 884fa9e4066Sahrens 885fa9e4066Sahrens static void 886fa9e4066Sahrens dbuf_read_done(zio_t *zio, arc_buf_t *buf, void *vdb) 887fa9e4066Sahrens { 888fa9e4066Sahrens dmu_buf_impl_t *db = vdb; 889fa9e4066Sahrens 890fa9e4066Sahrens mutex_enter(&db->db_mtx); 891fa9e4066Sahrens ASSERT3U(db->db_state, ==, DB_READ); 892fa9e4066Sahrens /* 893fa9e4066Sahrens * All reads are synchronous, so we must have a hold on the dbuf 894fa9e4066Sahrens */ 895fa9e4066Sahrens ASSERT(refcount_count(&db->db_holds) > 0); 896ea8dc4b6Seschrock ASSERT(db->db_buf == NULL); 897fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 898c717a561Smaybee if (db->db_level == 0 && db->db_freed_in_flight) { 899fa9e4066Sahrens /* we were freed in flight; disregard any error */ 900fa9e4066Sahrens arc_release(buf, db); 901fa9e4066Sahrens bzero(buf->b_data, db->db.db_size); 9026b4acc8bSahrens arc_buf_freeze(buf); 903c717a561Smaybee db->db_freed_in_flight = FALSE; 904fa9e4066Sahrens dbuf_set_data(db, buf); 905fa9e4066Sahrens db->db_state = DB_CACHED; 906fa9e4066Sahrens } else if (zio == NULL || zio->io_error == 0) { 907fa9e4066Sahrens dbuf_set_data(db, buf); 908fa9e4066Sahrens db->db_state = DB_CACHED; 909fa9e4066Sahrens } else { 9100a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 911fa9e4066Sahrens ASSERT3P(db->db_buf, ==, NULL); 912dcbf3bd6SGeorge Wilson arc_buf_destroy(buf, db); 913ea8dc4b6Seschrock db->db_state = DB_UNCACHED; 914fa9e4066Sahrens } 915fa9e4066Sahrens cv_broadcast(&db->db_changed); 9163f9d6ad7SLin Ling dbuf_rele_and_unlock(db, NULL); 917fa9e4066Sahrens } 918fa9e4066Sahrens 919ea8dc4b6Seschrock static void 920cf6106c8SMatthew Ahrens dbuf_read_impl(dmu_buf_impl_t *db, zio_t *zio, uint32_t flags) 921fa9e4066Sahrens { 922744947dcSTom Erickson dnode_t *dn; 9237802d7bfSMatthew Ahrens zbookmark_phys_t zb; 9247adb730bSGeorge Wilson arc_flags_t aflags = ARC_FLAG_NOWAIT; 925fa9e4066Sahrens 926744947dcSTom Erickson DB_DNODE_ENTER(db); 927744947dcSTom Erickson dn = DB_DNODE(db); 928fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 929fa9e4066Sahrens /* We need the struct_rwlock to prevent db_blkptr from changing. */ 930088f3894Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 931ea8dc4b6Seschrock ASSERT(MUTEX_HELD(&db->db_mtx)); 932ea8dc4b6Seschrock ASSERT(db->db_state == DB_UNCACHED); 933ea8dc4b6Seschrock ASSERT(db->db_buf == NULL); 934fa9e4066Sahrens 9350a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 936cf04dda1SMark Maybee int bonuslen = MIN(dn->dn_bonuslen, dn->dn_phys->dn_bonuslen); 9371934e92fSmaybee 9381934e92fSmaybee ASSERT3U(bonuslen, <=, db->db.db_size); 939ea8dc4b6Seschrock db->db.db_data = zio_buf_alloc(DN_MAX_BONUSLEN); 9405a98e54bSBrendan Gregg - Sun Microsystems arc_space_consume(DN_MAX_BONUSLEN, ARC_SPACE_OTHER); 9411934e92fSmaybee if (bonuslen < DN_MAX_BONUSLEN) 942ea8dc4b6Seschrock bzero(db->db.db_data, DN_MAX_BONUSLEN); 943cf04dda1SMark Maybee if (bonuslen) 944cf04dda1SMark Maybee bcopy(DN_BONUS(dn->dn_phys), db->db.db_data, bonuslen); 945744947dcSTom Erickson DB_DNODE_EXIT(db); 946fa9e4066Sahrens db->db_state = DB_CACHED; 947fa9e4066Sahrens mutex_exit(&db->db_mtx); 948fa9e4066Sahrens return; 949fa9e4066Sahrens } 950fa9e4066Sahrens 9511c8564a7SMark Maybee /* 9521c8564a7SMark Maybee * Recheck BP_IS_HOLE() after dnode_block_freed() in case dnode_sync() 9531c8564a7SMark Maybee * processes the delete record and clears the bp while we are waiting 9541c8564a7SMark Maybee * for the dn_mtx (resulting in a "no" from block_freed). 9551c8564a7SMark Maybee */ 956088f3894Sahrens if (db->db_blkptr == NULL || BP_IS_HOLE(db->db_blkptr) || 9571c8564a7SMark Maybee (db->db_level == 0 && (dnode_block_freed(dn, db->db_blkid) || 9581c8564a7SMark Maybee BP_IS_HOLE(db->db_blkptr)))) { 959ad23a2dbSjohansen arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 960ad23a2dbSjohansen 961dcbf3bd6SGeorge Wilson dbuf_set_data(db, arc_alloc_buf(db->db_objset->os_spa, 96243466aaeSMax Grossman db->db.db_size, db, type)); 963fa9e4066Sahrens bzero(db->db.db_data, db->db.db_size); 9648df0bcf0SPaul Dagnelie 9658df0bcf0SPaul Dagnelie if (db->db_blkptr != NULL && db->db_level > 0 && 9668df0bcf0SPaul Dagnelie BP_IS_HOLE(db->db_blkptr) && 9678df0bcf0SPaul Dagnelie db->db_blkptr->blk_birth != 0) { 9688df0bcf0SPaul Dagnelie blkptr_t *bps = db->db.db_data; 9698df0bcf0SPaul Dagnelie for (int i = 0; i < ((1 << 9708df0bcf0SPaul Dagnelie DB_DNODE(db)->dn_indblkshift) / sizeof (blkptr_t)); 9718df0bcf0SPaul Dagnelie i++) { 9728df0bcf0SPaul Dagnelie blkptr_t *bp = &bps[i]; 9738df0bcf0SPaul Dagnelie ASSERT3U(BP_GET_LSIZE(db->db_blkptr), ==, 9748df0bcf0SPaul Dagnelie 1 << dn->dn_indblkshift); 9758df0bcf0SPaul Dagnelie BP_SET_LSIZE(bp, 9768df0bcf0SPaul Dagnelie BP_GET_LEVEL(db->db_blkptr) == 1 ? 9778df0bcf0SPaul Dagnelie dn->dn_datablksz : 9788df0bcf0SPaul Dagnelie BP_GET_LSIZE(db->db_blkptr)); 9798df0bcf0SPaul Dagnelie BP_SET_TYPE(bp, BP_GET_TYPE(db->db_blkptr)); 9808df0bcf0SPaul Dagnelie BP_SET_LEVEL(bp, 9818df0bcf0SPaul Dagnelie BP_GET_LEVEL(db->db_blkptr) - 1); 9828df0bcf0SPaul Dagnelie BP_SET_BIRTH(bp, db->db_blkptr->blk_birth, 0); 9838df0bcf0SPaul Dagnelie } 9848df0bcf0SPaul Dagnelie } 9858df0bcf0SPaul Dagnelie DB_DNODE_EXIT(db); 986fa9e4066Sahrens db->db_state = DB_CACHED; 987fa9e4066Sahrens mutex_exit(&db->db_mtx); 988fa9e4066Sahrens return; 989fa9e4066Sahrens } 990fa9e4066Sahrens 991744947dcSTom Erickson DB_DNODE_EXIT(db); 992744947dcSTom Erickson 993fa9e4066Sahrens db->db_state = DB_READ; 994fa9e4066Sahrens mutex_exit(&db->db_mtx); 995fa9e4066Sahrens 9963baa08fcSek110237 if (DBUF_IS_L2CACHEABLE(db)) 9977adb730bSGeorge Wilson aflags |= ARC_FLAG_L2CACHE; 9983baa08fcSek110237 999b24ab676SJeff Bonwick SET_BOOKMARK(&zb, db->db_objset->os_dsl_dataset ? 1000b24ab676SJeff Bonwick db->db_objset->os_dsl_dataset->ds_object : DMU_META_OBJSET, 1001b24ab676SJeff Bonwick db->db.db_object, db->db_level, db->db_blkid); 1002ea8dc4b6Seschrock 1003ea8dc4b6Seschrock dbuf_add_ref(db, NULL); 1004088f3894Sahrens 100543466aaeSMax Grossman (void) arc_read(zio, db->db_objset->os_spa, db->db_blkptr, 1006fa9e4066Sahrens dbuf_read_done, db, ZIO_PRIORITY_SYNC_READ, 1007cf6106c8SMatthew Ahrens (flags & DB_RF_CANFAIL) ? ZIO_FLAG_CANFAIL : ZIO_FLAG_MUSTSUCCEED, 100813506d1eSmaybee &aflags, &zb); 1009fa9e4066Sahrens } 1010fa9e4066Sahrens 1011ea8dc4b6Seschrock int 1012ea8dc4b6Seschrock dbuf_read(dmu_buf_impl_t *db, zio_t *zio, uint32_t flags) 1013fa9e4066Sahrens { 1014ea8dc4b6Seschrock int err = 0; 101543466aaeSMax Grossman boolean_t havepzio = (zio != NULL); 101643466aaeSMax Grossman boolean_t prefetch; 1017744947dcSTom Erickson dnode_t *dn; 1018fa9e4066Sahrens 1019fa9e4066Sahrens /* 1020fa9e4066Sahrens * We don't have to hold the mutex to check db_state because it 1021fa9e4066Sahrens * can't be freed while we have a hold on the buffer. 1022fa9e4066Sahrens */ 1023fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 1024fa9e4066Sahrens 102582c9918fSTim Haley if (db->db_state == DB_NOFILL) 1026be6fd75aSMatthew Ahrens return (SET_ERROR(EIO)); 102782c9918fSTim Haley 1028744947dcSTom Erickson DB_DNODE_ENTER(db); 1029744947dcSTom Erickson dn = DB_DNODE(db); 1030fa9e4066Sahrens if ((flags & DB_RF_HAVESTRUCT) == 0) 1031744947dcSTom Erickson rw_enter(&dn->dn_struct_rwlock, RW_READER); 1032fa9e4066Sahrens 10330a586ceaSMark Shellenbaum prefetch = db->db_level == 0 && db->db_blkid != DMU_BONUS_BLKID && 1034744947dcSTom Erickson (flags & DB_RF_NOPREFETCH) == 0 && dn != NULL && 10353baa08fcSek110237 DBUF_IS_CACHEABLE(db); 103613506d1eSmaybee 1037fa9e4066Sahrens mutex_enter(&db->db_mtx); 1038ea8dc4b6Seschrock if (db->db_state == DB_CACHED) { 1039ea8dc4b6Seschrock mutex_exit(&db->db_mtx); 104013506d1eSmaybee if (prefetch) 1041cb92f413SAlexander Motin dmu_zfetch(&dn->dn_zfetch, db->db_blkid, 1, B_TRUE); 1042ea8dc4b6Seschrock if ((flags & DB_RF_HAVESTRUCT) == 0) 1043744947dcSTom Erickson rw_exit(&dn->dn_struct_rwlock); 1044744947dcSTom Erickson DB_DNODE_EXIT(db); 1045ea8dc4b6Seschrock } else if (db->db_state == DB_UNCACHED) { 1046744947dcSTom Erickson spa_t *spa = dn->dn_objset->os_spa; 1047744947dcSTom Erickson 1048744947dcSTom Erickson if (zio == NULL) 1049744947dcSTom Erickson zio = zio_root(spa, NULL, NULL, ZIO_FLAG_CANFAIL); 1050cf6106c8SMatthew Ahrens dbuf_read_impl(db, zio, flags); 105113506d1eSmaybee 1052ea8dc4b6Seschrock /* dbuf_read_impl has dropped db_mtx for us */ 1053ea8dc4b6Seschrock 105413506d1eSmaybee if (prefetch) 1055cb92f413SAlexander Motin dmu_zfetch(&dn->dn_zfetch, db->db_blkid, 1, B_TRUE); 1056ea8dc4b6Seschrock 1057ea8dc4b6Seschrock if ((flags & DB_RF_HAVESTRUCT) == 0) 1058744947dcSTom Erickson rw_exit(&dn->dn_struct_rwlock); 1059744947dcSTom Erickson DB_DNODE_EXIT(db); 1060ea8dc4b6Seschrock 1061ea8dc4b6Seschrock if (!havepzio) 1062ea8dc4b6Seschrock err = zio_wait(zio); 1063ea8dc4b6Seschrock } else { 10643e30c24aSWill Andrews /* 10653e30c24aSWill Andrews * Another reader came in while the dbuf was in flight 10663e30c24aSWill Andrews * between UNCACHED and CACHED. Either a writer will finish 10673e30c24aSWill Andrews * writing the buffer (sending the dbuf to CACHED) or the 10683e30c24aSWill Andrews * first reader's request will reach the read_done callback 10693e30c24aSWill Andrews * and send the dbuf to CACHED. Otherwise, a failure 10703e30c24aSWill Andrews * occurred and the dbuf went to UNCACHED. 10713e30c24aSWill Andrews */ 107213506d1eSmaybee mutex_exit(&db->db_mtx); 107313506d1eSmaybee if (prefetch) 1074cb92f413SAlexander Motin dmu_zfetch(&dn->dn_zfetch, db->db_blkid, 1, B_TRUE); 1075ea8dc4b6Seschrock if ((flags & DB_RF_HAVESTRUCT) == 0) 1076744947dcSTom Erickson rw_exit(&dn->dn_struct_rwlock); 1077744947dcSTom Erickson DB_DNODE_EXIT(db); 107813506d1eSmaybee 10793e30c24aSWill Andrews /* Skip the wait per the caller's request. */ 108013506d1eSmaybee mutex_enter(&db->db_mtx); 1081ea8dc4b6Seschrock if ((flags & DB_RF_NEVERWAIT) == 0) { 1082ea8dc4b6Seschrock while (db->db_state == DB_READ || 1083ea8dc4b6Seschrock db->db_state == DB_FILL) { 1084fa9e4066Sahrens ASSERT(db->db_state == DB_READ || 1085fa9e4066Sahrens (flags & DB_RF_HAVESTRUCT) == 0); 1086f6164ad6SAdam H. Leventhal DTRACE_PROBE2(blocked__read, dmu_buf_impl_t *, 1087f6164ad6SAdam H. Leventhal db, zio_t *, zio); 1088fa9e4066Sahrens cv_wait(&db->db_changed, &db->db_mtx); 1089fa9e4066Sahrens } 1090ea8dc4b6Seschrock if (db->db_state == DB_UNCACHED) 1091be6fd75aSMatthew Ahrens err = SET_ERROR(EIO); 1092ea8dc4b6Seschrock } 1093fa9e4066Sahrens mutex_exit(&db->db_mtx); 1094fa9e4066Sahrens } 1095fa9e4066Sahrens 1096ea8dc4b6Seschrock ASSERT(err || havepzio || db->db_state == DB_CACHED); 1097ea8dc4b6Seschrock return (err); 1098fa9e4066Sahrens } 1099fa9e4066Sahrens 1100fa9e4066Sahrens static void 1101fa9e4066Sahrens dbuf_noread(dmu_buf_impl_t *db) 1102fa9e4066Sahrens { 1103fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 11040a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 1105fa9e4066Sahrens mutex_enter(&db->db_mtx); 1106fa9e4066Sahrens while (db->db_state == DB_READ || db->db_state == DB_FILL) 1107fa9e4066Sahrens cv_wait(&db->db_changed, &db->db_mtx); 1108fa9e4066Sahrens if (db->db_state == DB_UNCACHED) { 1109ad23a2dbSjohansen arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 111043466aaeSMax Grossman spa_t *spa = db->db_objset->os_spa; 1111ad23a2dbSjohansen 1112ea8dc4b6Seschrock ASSERT(db->db_buf == NULL); 1113fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 1114dcbf3bd6SGeorge Wilson dbuf_set_data(db, arc_alloc_buf(spa, db->db.db_size, db, type)); 1115fa9e4066Sahrens db->db_state = DB_FILL; 111682c9918fSTim Haley } else if (db->db_state == DB_NOFILL) { 1117bc9014e6SJustin Gibbs dbuf_clear_data(db); 1118fa9e4066Sahrens } else { 1119fa9e4066Sahrens ASSERT3U(db->db_state, ==, DB_CACHED); 1120fa9e4066Sahrens } 1121fa9e4066Sahrens mutex_exit(&db->db_mtx); 1122fa9e4066Sahrens } 1123fa9e4066Sahrens 1124fa9e4066Sahrens /* 1125fa9e4066Sahrens * This is our just-in-time copy function. It makes a copy of 1126fa9e4066Sahrens * buffers, that have been modified in a previous transaction 1127fa9e4066Sahrens * group, before we modify them in the current active group. 1128fa9e4066Sahrens * 1129fa9e4066Sahrens * This function is used in two places: when we are dirtying a 1130fa9e4066Sahrens * buffer for the first time in a txg, and when we are freeing 1131fa9e4066Sahrens * a range in a dnode that includes this buffer. 1132fa9e4066Sahrens * 1133fa9e4066Sahrens * Note that when we are called from dbuf_free_range() we do 1134fa9e4066Sahrens * not put a hold on the buffer, we just traverse the active 1135fa9e4066Sahrens * dbuf list for the dnode. 1136fa9e4066Sahrens */ 1137fa9e4066Sahrens static void 1138fa9e4066Sahrens dbuf_fix_old_data(dmu_buf_impl_t *db, uint64_t txg) 1139fa9e4066Sahrens { 1140c717a561Smaybee dbuf_dirty_record_t *dr = db->db_last_dirty; 1141fa9e4066Sahrens 1142fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 1143fa9e4066Sahrens ASSERT(db->db.db_data != NULL); 1144c717a561Smaybee ASSERT(db->db_level == 0); 1145c717a561Smaybee ASSERT(db->db.db_object != DMU_META_DNODE_OBJECT); 1146fa9e4066Sahrens 11474d31c452Smaybee if (dr == NULL || 11484d31c452Smaybee (dr->dt.dl.dr_data != 11490a586ceaSMark Shellenbaum ((db->db_blkid == DMU_BONUS_BLKID) ? db->db.db_data : db->db_buf))) 1150fa9e4066Sahrens return; 1151fa9e4066Sahrens 1152fa9e4066Sahrens /* 1153c717a561Smaybee * If the last dirty record for this dbuf has not yet synced 1154c717a561Smaybee * and its referencing the dbuf data, either: 1155c717a561Smaybee * reset the reference to point to a new copy, 1156c717a561Smaybee * or (if there a no active holders) 1157c717a561Smaybee * just null out the current db_data pointer. 1158fa9e4066Sahrens */ 1159c717a561Smaybee ASSERT(dr->dr_txg >= txg - 2); 11600a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 1161c717a561Smaybee /* Note that the data bufs here are zio_bufs */ 1162c717a561Smaybee dr->dt.dl.dr_data = zio_buf_alloc(DN_MAX_BONUSLEN); 11635a98e54bSBrendan Gregg - Sun Microsystems arc_space_consume(DN_MAX_BONUSLEN, ARC_SPACE_OTHER); 1164c717a561Smaybee bcopy(db->db.db_data, dr->dt.dl.dr_data, DN_MAX_BONUSLEN); 1165c717a561Smaybee } else if (refcount_count(&db->db_holds) > db->db_dirtycnt) { 1166ea8dc4b6Seschrock int size = db->db.db_size; 1167c717a561Smaybee arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 116843466aaeSMax Grossman spa_t *spa = db->db_objset->os_spa; 1169744947dcSTom Erickson 1170dcbf3bd6SGeorge Wilson dr->dt.dl.dr_data = arc_alloc_buf(spa, size, db, type); 1171c717a561Smaybee bcopy(db->db.db_data, dr->dt.dl.dr_data->b_data, size); 1172fa9e4066Sahrens } else { 1173dcbf3bd6SGeorge Wilson db->db_buf = NULL; 1174bc9014e6SJustin Gibbs dbuf_clear_data(db); 1175fa9e4066Sahrens } 1176fa9e4066Sahrens } 1177ea8dc4b6Seschrock 1178fa9e4066Sahrens void 1179c717a561Smaybee dbuf_unoverride(dbuf_dirty_record_t *dr) 1180fa9e4066Sahrens { 1181c717a561Smaybee dmu_buf_impl_t *db = dr->dr_dbuf; 1182b24ab676SJeff Bonwick blkptr_t *bp = &dr->dt.dl.dr_overridden_by; 1183c717a561Smaybee uint64_t txg = dr->dr_txg; 1184c5c6ffa0Smaybee 1185c717a561Smaybee ASSERT(MUTEX_HELD(&db->db_mtx)); 1186c717a561Smaybee ASSERT(dr->dt.dl.dr_override_state != DR_IN_DMU_SYNC); 1187c717a561Smaybee ASSERT(db->db_level == 0); 1188c717a561Smaybee 11890a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID || 1190c717a561Smaybee dr->dt.dl.dr_override_state == DR_NOT_OVERRIDDEN) 1191c717a561Smaybee return; 1192c717a561Smaybee 1193b24ab676SJeff Bonwick ASSERT(db->db_data_pending != dr); 1194b24ab676SJeff Bonwick 1195fa9e4066Sahrens /* free this block */ 119643466aaeSMax Grossman if (!BP_IS_HOLE(bp) && !dr->dt.dl.dr_nopwrite) 119743466aaeSMax Grossman zio_free(db->db_objset->os_spa, txg, bp); 1198b24ab676SJeff Bonwick 1199c717a561Smaybee dr->dt.dl.dr_override_state = DR_NOT_OVERRIDDEN; 120080901aeaSGeorge Wilson dr->dt.dl.dr_nopwrite = B_FALSE; 120180901aeaSGeorge Wilson 12026b4acc8bSahrens /* 12036b4acc8bSahrens * Release the already-written buffer, so we leave it in 12046b4acc8bSahrens * a consistent dirty state. Note that all callers are 12056b4acc8bSahrens * modifying the buffer, so they will immediately do 12066b4acc8bSahrens * another (redundant) arc_release(). Therefore, leave 12076b4acc8bSahrens * the buf thawed to save the effort of freezing & 12086b4acc8bSahrens * immediately re-thawing it. 12096b4acc8bSahrens */ 1210c717a561Smaybee arc_release(dr->dt.dl.dr_data, db); 1211fa9e4066Sahrens } 1212fa9e4066Sahrens 1213cdb0ab79Smaybee /* 1214cdb0ab79Smaybee * Evict (if its unreferenced) or clear (if its referenced) any level-0 1215cdb0ab79Smaybee * data blocks in the free range, so that any future readers will find 121643466aaeSMax Grossman * empty blocks. 1217cdb0ab79Smaybee */ 1218fa9e4066Sahrens void 12190f6d88adSAlex Reece dbuf_free_range(dnode_t *dn, uint64_t start_blkid, uint64_t end_blkid, 12200f6d88adSAlex Reece dmu_tx_t *tx) 1221fa9e4066Sahrens { 1222bc9014e6SJustin Gibbs dmu_buf_impl_t db_search; 1223bc9014e6SJustin Gibbs dmu_buf_impl_t *db, *db_next; 1224fa9e4066Sahrens uint64_t txg = tx->tx_txg; 12250f6d88adSAlex Reece avl_index_t where; 1226fa9e4066Sahrens 1227*653af1b8SStephen Blinick if (end_blkid > dn->dn_maxblkid && 1228*653af1b8SStephen Blinick !(start_blkid == DMU_SPILL_BLKID || end_blkid == DMU_SPILL_BLKID)) 12290f6d88adSAlex Reece end_blkid = dn->dn_maxblkid; 12300f6d88adSAlex Reece dprintf_dnode(dn, "start=%llu end=%llu\n", start_blkid, end_blkid); 12310f6d88adSAlex Reece 12320f6d88adSAlex Reece db_search.db_level = 0; 12330f6d88adSAlex Reece db_search.db_blkid = start_blkid; 123486bb58aeSAlex Reece db_search.db_state = DB_SEARCH; 12352f3d8780SMatthew Ahrens 1236713d6c20SMatthew Ahrens mutex_enter(&dn->dn_dbufs_mtx); 12370f6d88adSAlex Reece db = avl_find(&dn->dn_dbufs, &db_search, &where); 12380f6d88adSAlex Reece ASSERT3P(db, ==, NULL); 12392f3d8780SMatthew Ahrens 12400f6d88adSAlex Reece db = avl_nearest(&dn->dn_dbufs, where, AVL_AFTER); 12410f6d88adSAlex Reece 12420f6d88adSAlex Reece for (; db != NULL; db = db_next) { 12430f6d88adSAlex Reece db_next = AVL_NEXT(&dn->dn_dbufs, db); 12440a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 1245cdb0ab79Smaybee 12460f6d88adSAlex Reece if (db->db_level != 0 || db->db_blkid > end_blkid) { 12470f6d88adSAlex Reece break; 12480f6d88adSAlex Reece } 12490f6d88adSAlex Reece ASSERT3U(db->db_blkid, >=, start_blkid); 1250fa9e4066Sahrens 1251fa9e4066Sahrens /* found a level 0 buffer in the range */ 1252fa9e4066Sahrens mutex_enter(&db->db_mtx); 12533b2aab18SMatthew Ahrens if (dbuf_undirty(db, tx)) { 12543b2aab18SMatthew Ahrens /* mutex has been dropped and dbuf destroyed */ 12553b2aab18SMatthew Ahrens continue; 12563b2aab18SMatthew Ahrens } 12573b2aab18SMatthew Ahrens 1258ea8dc4b6Seschrock if (db->db_state == DB_UNCACHED || 125982c9918fSTim Haley db->db_state == DB_NOFILL || 1260ea8dc4b6Seschrock db->db_state == DB_EVICTING) { 1261fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 1262fa9e4066Sahrens mutex_exit(&db->db_mtx); 1263fa9e4066Sahrens continue; 1264fa9e4066Sahrens } 1265c543ec06Sahrens if (db->db_state == DB_READ || db->db_state == DB_FILL) { 1266c543ec06Sahrens /* will be handled in dbuf_read_done or dbuf_rele */ 1267c717a561Smaybee db->db_freed_in_flight = TRUE; 1268fa9e4066Sahrens mutex_exit(&db->db_mtx); 1269fa9e4066Sahrens continue; 1270fa9e4066Sahrens } 1271ea8dc4b6Seschrock if (refcount_count(&db->db_holds) == 0) { 1272ea8dc4b6Seschrock ASSERT(db->db_buf); 1273dcbf3bd6SGeorge Wilson dbuf_destroy(db); 1274ea8dc4b6Seschrock continue; 1275ea8dc4b6Seschrock } 1276c717a561Smaybee /* The dbuf is referenced */ 1277fa9e4066Sahrens 1278c717a561Smaybee if (db->db_last_dirty != NULL) { 1279c717a561Smaybee dbuf_dirty_record_t *dr = db->db_last_dirty; 1280c717a561Smaybee 1281c717a561Smaybee if (dr->dr_txg == txg) { 1282ea8dc4b6Seschrock /* 1283c717a561Smaybee * This buffer is "in-use", re-adjust the file 1284c717a561Smaybee * size to reflect that this buffer may 1285c717a561Smaybee * contain new data when we sync. 1286ea8dc4b6Seschrock */ 128706e0070dSMark Shellenbaum if (db->db_blkid != DMU_SPILL_BLKID && 128806e0070dSMark Shellenbaum db->db_blkid > dn->dn_maxblkid) 128944eda4d7Smaybee dn->dn_maxblkid = db->db_blkid; 1290c717a561Smaybee dbuf_unoverride(dr); 1291c717a561Smaybee } else { 1292c717a561Smaybee /* 1293c717a561Smaybee * This dbuf is not dirty in the open context. 1294c717a561Smaybee * Either uncache it (if its not referenced in 1295c717a561Smaybee * the open context) or reset its contents to 1296c717a561Smaybee * empty. 1297c717a561Smaybee */ 1298c717a561Smaybee dbuf_fix_old_data(db, txg); 129944eda4d7Smaybee } 1300c717a561Smaybee } 1301c717a561Smaybee /* clear the contents if its cached */ 1302ea8dc4b6Seschrock if (db->db_state == DB_CACHED) { 1303ea8dc4b6Seschrock ASSERT(db->db.db_data != NULL); 1304fa9e4066Sahrens arc_release(db->db_buf, db); 1305fa9e4066Sahrens bzero(db->db.db_data, db->db.db_size); 13066b4acc8bSahrens arc_buf_freeze(db->db_buf); 1307fa9e4066Sahrens } 1308ea8dc4b6Seschrock 1309fa9e4066Sahrens mutex_exit(&db->db_mtx); 1310fa9e4066Sahrens } 1311fa9e4066Sahrens mutex_exit(&dn->dn_dbufs_mtx); 1312fa9e4066Sahrens } 1313fa9e4066Sahrens 1314fa9e4066Sahrens static int 13151934e92fSmaybee dbuf_block_freeable(dmu_buf_impl_t *db) 1316fa9e4066Sahrens { 1317fa9e4066Sahrens dsl_dataset_t *ds = db->db_objset->os_dsl_dataset; 1318fa9e4066Sahrens uint64_t birth_txg = 0; 1319fa9e4066Sahrens 1320fa9e4066Sahrens /* 1321fa9e4066Sahrens * We don't need any locking to protect db_blkptr: 1322c717a561Smaybee * If it's syncing, then db_last_dirty will be set 1323c717a561Smaybee * so we'll ignore db_blkptr. 132443466aaeSMax Grossman * 132543466aaeSMax Grossman * This logic ensures that only block births for 132643466aaeSMax Grossman * filled blocks are considered. 1327fa9e4066Sahrens */ 1328c717a561Smaybee ASSERT(MUTEX_HELD(&db->db_mtx)); 132943466aaeSMax Grossman if (db->db_last_dirty && (db->db_blkptr == NULL || 133043466aaeSMax Grossman !BP_IS_HOLE(db->db_blkptr))) { 1331c717a561Smaybee birth_txg = db->db_last_dirty->dr_txg; 133243466aaeSMax Grossman } else if (db->db_blkptr != NULL && !BP_IS_HOLE(db->db_blkptr)) { 1333fa9e4066Sahrens birth_txg = db->db_blkptr->blk_birth; 133443466aaeSMax Grossman } 1335fa9e4066Sahrens 1336837b568bSGeorge Wilson /* 133743466aaeSMax Grossman * If this block don't exist or is in a snapshot, it can't be freed. 1338837b568bSGeorge Wilson * Don't pass the bp to dsl_dataset_block_freeable() since we 1339837b568bSGeorge Wilson * are holding the db_mtx lock and might deadlock if we are 1340837b568bSGeorge Wilson * prefetching a dedup-ed block. 1341837b568bSGeorge Wilson */ 134243466aaeSMax Grossman if (birth_txg != 0) 13431934e92fSmaybee return (ds == NULL || 1344837b568bSGeorge Wilson dsl_dataset_block_freeable(ds, NULL, birth_txg)); 1345fa9e4066Sahrens else 134643466aaeSMax Grossman return (B_FALSE); 1347fa9e4066Sahrens } 1348fa9e4066Sahrens 1349fa9e4066Sahrens void 1350fa9e4066Sahrens dbuf_new_size(dmu_buf_impl_t *db, int size, dmu_tx_t *tx) 1351fa9e4066Sahrens { 1352fa9e4066Sahrens arc_buf_t *buf, *obuf; 1353fa9e4066Sahrens int osize = db->db.db_size; 1354ad23a2dbSjohansen arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 1355744947dcSTom Erickson dnode_t *dn; 1356fa9e4066Sahrens 13570a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 1358ea8dc4b6Seschrock 1359744947dcSTom Erickson DB_DNODE_ENTER(db); 1360744947dcSTom Erickson dn = DB_DNODE(db); 1361744947dcSTom Erickson 1362fa9e4066Sahrens /* XXX does *this* func really need the lock? */ 1363744947dcSTom Erickson ASSERT(RW_WRITE_HELD(&dn->dn_struct_rwlock)); 1364fa9e4066Sahrens 1365fa9e4066Sahrens /* 136643466aaeSMax Grossman * This call to dmu_buf_will_dirty() with the dn_struct_rwlock held 1367fa9e4066Sahrens * is OK, because there can be no other references to the db 1368fa9e4066Sahrens * when we are changing its size, so no concurrent DB_FILL can 1369fa9e4066Sahrens * be happening. 1370fa9e4066Sahrens */ 1371ea8dc4b6Seschrock /* 1372ea8dc4b6Seschrock * XXX we should be doing a dbuf_read, checking the return 1373ea8dc4b6Seschrock * value and returning that up to our callers 1374ea8dc4b6Seschrock */ 137543466aaeSMax Grossman dmu_buf_will_dirty(&db->db, tx); 1376fa9e4066Sahrens 1377fa9e4066Sahrens /* create the data buffer for the new block */ 1378dcbf3bd6SGeorge Wilson buf = arc_alloc_buf(dn->dn_objset->os_spa, size, db, type); 1379fa9e4066Sahrens 1380fa9e4066Sahrens /* copy old block data to the new block */ 1381fa9e4066Sahrens obuf = db->db_buf; 1382f65e61c0Sahrens bcopy(obuf->b_data, buf->b_data, MIN(osize, size)); 1383fa9e4066Sahrens /* zero the remainder */ 1384f65e61c0Sahrens if (size > osize) 1385fa9e4066Sahrens bzero((uint8_t *)buf->b_data + osize, size - osize); 1386fa9e4066Sahrens 1387fa9e4066Sahrens mutex_enter(&db->db_mtx); 1388fa9e4066Sahrens dbuf_set_data(db, buf); 1389dcbf3bd6SGeorge Wilson arc_buf_destroy(obuf, db); 1390fa9e4066Sahrens db->db.db_size = size; 1391fa9e4066Sahrens 1392c717a561Smaybee if (db->db_level == 0) { 1393c717a561Smaybee ASSERT3U(db->db_last_dirty->dr_txg, ==, tx->tx_txg); 1394c717a561Smaybee db->db_last_dirty->dt.dl.dr_data = buf; 1395c717a561Smaybee } 1396fa9e4066Sahrens mutex_exit(&db->db_mtx); 1397fa9e4066Sahrens 1398744947dcSTom Erickson dnode_willuse_space(dn, size-osize, tx); 1399744947dcSTom Erickson DB_DNODE_EXIT(db); 1400fa9e4066Sahrens } 1401fa9e4066Sahrens 14023f9d6ad7SLin Ling void 14033f9d6ad7SLin Ling dbuf_release_bp(dmu_buf_impl_t *db) 14043f9d6ad7SLin Ling { 140543466aaeSMax Grossman objset_t *os = db->db_objset; 14063f9d6ad7SLin Ling 14073f9d6ad7SLin Ling ASSERT(dsl_pool_sync_context(dmu_objset_pool(os))); 14083f9d6ad7SLin Ling ASSERT(arc_released(os->os_phys_buf) || 14093f9d6ad7SLin Ling list_link_active(&os->os_dsl_dataset->ds_synced_link)); 14103f9d6ad7SLin Ling ASSERT(db->db_parent == NULL || arc_released(db->db_parent->db_buf)); 14113f9d6ad7SLin Ling 14121b912ec7SGeorge Wilson (void) arc_release(db->db_buf, db); 14133f9d6ad7SLin Ling } 14143f9d6ad7SLin Ling 14150f2e7d03SMatthew Ahrens /* 14160f2e7d03SMatthew Ahrens * We already have a dirty record for this TXG, and we are being 14170f2e7d03SMatthew Ahrens * dirtied again. 14180f2e7d03SMatthew Ahrens */ 14190f2e7d03SMatthew Ahrens static void 14200f2e7d03SMatthew Ahrens dbuf_redirty(dbuf_dirty_record_t *dr) 14210f2e7d03SMatthew Ahrens { 14220f2e7d03SMatthew Ahrens dmu_buf_impl_t *db = dr->dr_dbuf; 14230f2e7d03SMatthew Ahrens 14240f2e7d03SMatthew Ahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 14250f2e7d03SMatthew Ahrens 14260f2e7d03SMatthew Ahrens if (db->db_level == 0 && db->db_blkid != DMU_BONUS_BLKID) { 14270f2e7d03SMatthew Ahrens /* 14280f2e7d03SMatthew Ahrens * If this buffer has already been written out, 14290f2e7d03SMatthew Ahrens * we now need to reset its state. 14300f2e7d03SMatthew Ahrens */ 14310f2e7d03SMatthew Ahrens dbuf_unoverride(dr); 14320f2e7d03SMatthew Ahrens if (db->db.db_object != DMU_META_DNODE_OBJECT && 14330f2e7d03SMatthew Ahrens db->db_state != DB_NOFILL) { 14340f2e7d03SMatthew Ahrens /* Already released on initial dirty, so just thaw. */ 14350f2e7d03SMatthew Ahrens ASSERT(arc_released(db->db_buf)); 14360f2e7d03SMatthew Ahrens arc_buf_thaw(db->db_buf); 14370f2e7d03SMatthew Ahrens } 14380f2e7d03SMatthew Ahrens } 14390f2e7d03SMatthew Ahrens } 14400f2e7d03SMatthew Ahrens 1441c717a561Smaybee dbuf_dirty_record_t * 1442fa9e4066Sahrens dbuf_dirty(dmu_buf_impl_t *db, dmu_tx_t *tx) 1443fa9e4066Sahrens { 1444744947dcSTom Erickson dnode_t *dn; 1445744947dcSTom Erickson objset_t *os; 1446c717a561Smaybee dbuf_dirty_record_t **drp, *dr; 1447fa9e4066Sahrens int drop_struct_lock = FALSE; 1448d3469faaSMark Maybee boolean_t do_free_accounting = B_FALSE; 1449fa9e4066Sahrens int txgoff = tx->tx_txg & TXG_MASK; 1450fa9e4066Sahrens 1451fa9e4066Sahrens ASSERT(tx->tx_txg != 0); 1452fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 14539c9dc39aSek110237 DMU_TX_DIRTY_BUF(tx, db); 1454fa9e4066Sahrens 1455744947dcSTom Erickson DB_DNODE_ENTER(db); 1456744947dcSTom Erickson dn = DB_DNODE(db); 1457fa9e4066Sahrens /* 1458fa9e4066Sahrens * Shouldn't dirty a regular buffer in syncing context. Private 1459fa9e4066Sahrens * objects may be dirtied in syncing context, but only if they 1460fa9e4066Sahrens * were already pre-dirtied in open context. 1461fa9e4066Sahrens */ 1462c166b69dSPaul Dagnelie #ifdef DEBUG 1463c166b69dSPaul Dagnelie if (dn->dn_objset->os_dsl_dataset != NULL) { 1464c166b69dSPaul Dagnelie rrw_enter(&dn->dn_objset->os_dsl_dataset->ds_bp_rwlock, 1465c166b69dSPaul Dagnelie RW_READER, FTAG); 1466c166b69dSPaul Dagnelie } 1467c717a561Smaybee ASSERT(!dmu_tx_is_syncing(tx) || 1468c717a561Smaybee BP_IS_HOLE(dn->dn_objset->os_rootbp) || 146914843421SMatthew Ahrens DMU_OBJECT_IS_SPECIAL(dn->dn_object) || 147014843421SMatthew Ahrens dn->dn_objset->os_dsl_dataset == NULL); 1471c166b69dSPaul Dagnelie if (dn->dn_objset->os_dsl_dataset != NULL) 1472c166b69dSPaul Dagnelie rrw_exit(&dn->dn_objset->os_dsl_dataset->ds_bp_rwlock, FTAG); 1473c166b69dSPaul Dagnelie #endif 1474fa9e4066Sahrens /* 1475fa9e4066Sahrens * We make this assert for private objects as well, but after we 1476fa9e4066Sahrens * check if we're already dirty. They are allowed to re-dirty 1477fa9e4066Sahrens * in syncing context. 1478fa9e4066Sahrens */ 1479ea8dc4b6Seschrock ASSERT(dn->dn_object == DMU_META_DNODE_OBJECT || 1480c717a561Smaybee dn->dn_dirtyctx == DN_UNDIRTIED || dn->dn_dirtyctx == 1481fa9e4066Sahrens (dmu_tx_is_syncing(tx) ? DN_DIRTY_SYNC : DN_DIRTY_OPEN)); 1482fa9e4066Sahrens 1483fa9e4066Sahrens mutex_enter(&db->db_mtx); 1484fa9e4066Sahrens /* 1485c717a561Smaybee * XXX make this true for indirects too? The problem is that 1486c717a561Smaybee * transactions created with dmu_tx_create_assigned() from 1487c717a561Smaybee * syncing context don't bother holding ahead. 1488fa9e4066Sahrens */ 1489c717a561Smaybee ASSERT(db->db_level != 0 || 149082c9918fSTim Haley db->db_state == DB_CACHED || db->db_state == DB_FILL || 149182c9918fSTim Haley db->db_state == DB_NOFILL); 1492fa9e4066Sahrens 1493fa9e4066Sahrens mutex_enter(&dn->dn_mtx); 1494fa9e4066Sahrens /* 1495fa9e4066Sahrens * Don't set dirtyctx to SYNC if we're just modifying this as we 1496fa9e4066Sahrens * initialize the objset. 1497fa9e4066Sahrens */ 1498c166b69dSPaul Dagnelie if (dn->dn_dirtyctx == DN_UNDIRTIED) { 1499c166b69dSPaul Dagnelie if (dn->dn_objset->os_dsl_dataset != NULL) { 1500c166b69dSPaul Dagnelie rrw_enter(&dn->dn_objset->os_dsl_dataset->ds_bp_rwlock, 1501c166b69dSPaul Dagnelie RW_READER, FTAG); 1502c166b69dSPaul Dagnelie } 1503c166b69dSPaul Dagnelie if (!BP_IS_HOLE(dn->dn_objset->os_rootbp)) { 1504c166b69dSPaul Dagnelie dn->dn_dirtyctx = (dmu_tx_is_syncing(tx) ? 1505c166b69dSPaul Dagnelie DN_DIRTY_SYNC : DN_DIRTY_OPEN); 1506fa9e4066Sahrens ASSERT(dn->dn_dirtyctx_firstset == NULL); 1507fa9e4066Sahrens dn->dn_dirtyctx_firstset = kmem_alloc(1, KM_SLEEP); 1508fa9e4066Sahrens } 1509c166b69dSPaul Dagnelie if (dn->dn_objset->os_dsl_dataset != NULL) { 1510c166b69dSPaul Dagnelie rrw_exit(&dn->dn_objset->os_dsl_dataset->ds_bp_rwlock, 1511c166b69dSPaul Dagnelie FTAG); 1512c166b69dSPaul Dagnelie } 1513c166b69dSPaul Dagnelie } 1514fa9e4066Sahrens mutex_exit(&dn->dn_mtx); 1515fa9e4066Sahrens 15160a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) 15170a586ceaSMark Shellenbaum dn->dn_have_spill = B_TRUE; 15180a586ceaSMark Shellenbaum 1519fa9e4066Sahrens /* 1520fa9e4066Sahrens * If this buffer is already dirty, we're done. 1521fa9e4066Sahrens */ 1522c717a561Smaybee drp = &db->db_last_dirty; 1523c717a561Smaybee ASSERT(*drp == NULL || (*drp)->dr_txg <= tx->tx_txg || 1524c717a561Smaybee db->db.db_object == DMU_META_DNODE_OBJECT); 15257e2186e3Sbonwick while ((dr = *drp) != NULL && dr->dr_txg > tx->tx_txg) 15267e2186e3Sbonwick drp = &dr->dr_next; 15277e2186e3Sbonwick if (dr && dr->dr_txg == tx->tx_txg) { 1528744947dcSTom Erickson DB_DNODE_EXIT(db); 1529744947dcSTom Erickson 15300f2e7d03SMatthew Ahrens dbuf_redirty(dr); 1531fa9e4066Sahrens mutex_exit(&db->db_mtx); 15327e2186e3Sbonwick return (dr); 1533fa9e4066Sahrens } 1534fa9e4066Sahrens 1535fa9e4066Sahrens /* 1536fa9e4066Sahrens * Only valid if not already dirty. 1537fa9e4066Sahrens */ 153814843421SMatthew Ahrens ASSERT(dn->dn_object == 0 || 153914843421SMatthew Ahrens dn->dn_dirtyctx == DN_UNDIRTIED || dn->dn_dirtyctx == 1540fa9e4066Sahrens (dmu_tx_is_syncing(tx) ? DN_DIRTY_SYNC : DN_DIRTY_OPEN)); 1541fa9e4066Sahrens 1542fa9e4066Sahrens ASSERT3U(dn->dn_nlevels, >, db->db_level); 1543fa9e4066Sahrens ASSERT((dn->dn_phys->dn_nlevels == 0 && db->db_level == 0) || 1544fa9e4066Sahrens dn->dn_phys->dn_nlevels > db->db_level || 1545fa9e4066Sahrens dn->dn_next_nlevels[txgoff] > db->db_level || 1546fa9e4066Sahrens dn->dn_next_nlevels[(tx->tx_txg-1) & TXG_MASK] > db->db_level || 1547fa9e4066Sahrens dn->dn_next_nlevels[(tx->tx_txg-2) & TXG_MASK] > db->db_level); 1548fa9e4066Sahrens 1549fa9e4066Sahrens /* 1550fa9e4066Sahrens * We should only be dirtying in syncing context if it's the 155114843421SMatthew Ahrens * mos or we're initializing the os or it's a special object. 155214843421SMatthew Ahrens * However, we are allowed to dirty in syncing context provided 155314843421SMatthew Ahrens * we already dirtied it in open context. Hence we must make 155414843421SMatthew Ahrens * this assertion only if we're not already dirty. 1555fa9e4066Sahrens */ 1556744947dcSTom Erickson os = dn->dn_objset; 1557c166b69dSPaul Dagnelie #ifdef DEBUG 1558c166b69dSPaul Dagnelie if (dn->dn_objset->os_dsl_dataset != NULL) 1559c166b69dSPaul Dagnelie rrw_enter(&os->os_dsl_dataset->ds_bp_rwlock, RW_READER, FTAG); 156014843421SMatthew Ahrens ASSERT(!dmu_tx_is_syncing(tx) || DMU_OBJECT_IS_SPECIAL(dn->dn_object) || 156114843421SMatthew Ahrens os->os_dsl_dataset == NULL || BP_IS_HOLE(os->os_rootbp)); 1562c166b69dSPaul Dagnelie if (dn->dn_objset->os_dsl_dataset != NULL) 1563c166b69dSPaul Dagnelie rrw_exit(&os->os_dsl_dataset->ds_bp_rwlock, FTAG); 1564c166b69dSPaul Dagnelie #endif 1565fa9e4066Sahrens ASSERT(db->db.db_size != 0); 1566fa9e4066Sahrens 1567fa9e4066Sahrens dprintf_dbuf(db, "size=%llx\n", (u_longlong_t)db->db.db_size); 1568fa9e4066Sahrens 15690a586ceaSMark Shellenbaum if (db->db_blkid != DMU_BONUS_BLKID) { 15701934e92fSmaybee /* 15711934e92fSmaybee * Update the accounting. 1572d3469faaSMark Maybee * Note: we delay "free accounting" until after we drop 1573d3469faaSMark Maybee * the db_mtx. This keeps us from grabbing other locks 1574b24ab676SJeff Bonwick * (and possibly deadlocking) in bp_get_dsize() while 1575d3469faaSMark Maybee * also holding the db_mtx. 15761934e92fSmaybee */ 15771934e92fSmaybee dnode_willuse_space(dn, db->db.db_size, tx); 1578d3469faaSMark Maybee do_free_accounting = dbuf_block_freeable(db); 15791934e92fSmaybee } 15801934e92fSmaybee 1581ea8dc4b6Seschrock /* 1582ea8dc4b6Seschrock * If this buffer is dirty in an old transaction group we need 1583ea8dc4b6Seschrock * to make a copy of it so that the changes we make in this 1584ea8dc4b6Seschrock * transaction group won't leak out when we sync the older txg. 1585ea8dc4b6Seschrock */ 1586c717a561Smaybee dr = kmem_zalloc(sizeof (dbuf_dirty_record_t), KM_SLEEP); 1587c717a561Smaybee if (db->db_level == 0) { 1588c717a561Smaybee void *data_old = db->db_buf; 1589c717a561Smaybee 159082c9918fSTim Haley if (db->db_state != DB_NOFILL) { 15910a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 1592c717a561Smaybee dbuf_fix_old_data(db, tx->tx_txg); 1593c717a561Smaybee data_old = db->db.db_data; 1594c717a561Smaybee } else if (db->db.db_object != DMU_META_DNODE_OBJECT) { 1595fa9e4066Sahrens /* 159682c9918fSTim Haley * Release the data buffer from the cache so 159782c9918fSTim Haley * that we can modify it without impacting 159882c9918fSTim Haley * possible other users of this cached data 159982c9918fSTim Haley * block. Note that indirect blocks and 160082c9918fSTim Haley * private objects are not released until the 160182c9918fSTim Haley * syncing state (since they are only modified 160282c9918fSTim Haley * then). 1603fa9e4066Sahrens */ 1604fa9e4066Sahrens arc_release(db->db_buf, db); 1605fa9e4066Sahrens dbuf_fix_old_data(db, tx->tx_txg); 1606c717a561Smaybee data_old = db->db_buf; 1607fa9e4066Sahrens } 1608c717a561Smaybee ASSERT(data_old != NULL); 160982c9918fSTim Haley } 1610c717a561Smaybee dr->dt.dl.dr_data = data_old; 1611c717a561Smaybee } else { 1612c717a561Smaybee mutex_init(&dr->dt.di.dr_mtx, NULL, MUTEX_DEFAULT, NULL); 1613c717a561Smaybee list_create(&dr->dt.di.dr_children, 1614c717a561Smaybee sizeof (dbuf_dirty_record_t), 1615c717a561Smaybee offsetof(dbuf_dirty_record_t, dr_dirty_node)); 1616fa9e4066Sahrens } 161769962b56SMatthew Ahrens if (db->db_blkid != DMU_BONUS_BLKID && os->os_dsl_dataset != NULL) 161869962b56SMatthew Ahrens dr->dr_accounted = db->db.db_size; 1619c717a561Smaybee dr->dr_dbuf = db; 1620c717a561Smaybee dr->dr_txg = tx->tx_txg; 1621c717a561Smaybee dr->dr_next = *drp; 1622c717a561Smaybee *drp = dr; 1623fa9e4066Sahrens 1624fa9e4066Sahrens /* 1625fa9e4066Sahrens * We could have been freed_in_flight between the dbuf_noread 1626fa9e4066Sahrens * and dbuf_dirty. We win, as though the dbuf_noread() had 1627fa9e4066Sahrens * happened after the free. 1628fa9e4066Sahrens */ 16290a586ceaSMark Shellenbaum if (db->db_level == 0 && db->db_blkid != DMU_BONUS_BLKID && 16300a586ceaSMark Shellenbaum db->db_blkid != DMU_SPILL_BLKID) { 1631c717a561Smaybee mutex_enter(&dn->dn_mtx); 1632bf16b11eSMatthew Ahrens if (dn->dn_free_ranges[txgoff] != NULL) { 1633bf16b11eSMatthew Ahrens range_tree_clear(dn->dn_free_ranges[txgoff], 1634bf16b11eSMatthew Ahrens db->db_blkid, 1); 1635bf16b11eSMatthew Ahrens } 1636fa9e4066Sahrens mutex_exit(&dn->dn_mtx); 1637c717a561Smaybee db->db_freed_in_flight = FALSE; 1638c717a561Smaybee } 1639fa9e4066Sahrens 1640fa9e4066Sahrens /* 1641fa9e4066Sahrens * This buffer is now part of this txg 1642fa9e4066Sahrens */ 1643fa9e4066Sahrens dbuf_add_ref(db, (void *)(uintptr_t)tx->tx_txg); 1644fa9e4066Sahrens db->db_dirtycnt += 1; 1645fa9e4066Sahrens ASSERT3U(db->db_dirtycnt, <=, 3); 1646fa9e4066Sahrens 1647fa9e4066Sahrens mutex_exit(&db->db_mtx); 1648fa9e4066Sahrens 16490a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID || 16500a586ceaSMark Shellenbaum db->db_blkid == DMU_SPILL_BLKID) { 1651c717a561Smaybee mutex_enter(&dn->dn_mtx); 1652c717a561Smaybee ASSERT(!list_link_active(&dr->dr_dirty_node)); 1653c717a561Smaybee list_insert_tail(&dn->dn_dirty_records[txgoff], dr); 1654c717a561Smaybee mutex_exit(&dn->dn_mtx); 1655fa9e4066Sahrens dnode_setdirty(dn, tx); 1656744947dcSTom Erickson DB_DNODE_EXIT(db); 1657c717a561Smaybee return (dr); 165892654925SMatthew Ahrens } 165992654925SMatthew Ahrens 166092654925SMatthew Ahrens /* 166192654925SMatthew Ahrens * The dn_struct_rwlock prevents db_blkptr from changing 166292654925SMatthew Ahrens * due to a write from syncing context completing 166392654925SMatthew Ahrens * while we are running, so we want to acquire it before 166492654925SMatthew Ahrens * looking at db_blkptr. 166592654925SMatthew Ahrens */ 166692654925SMatthew Ahrens if (!RW_WRITE_HELD(&dn->dn_struct_rwlock)) { 166792654925SMatthew Ahrens rw_enter(&dn->dn_struct_rwlock, RW_READER); 166892654925SMatthew Ahrens drop_struct_lock = TRUE; 166992654925SMatthew Ahrens } 167092654925SMatthew Ahrens 167192654925SMatthew Ahrens if (do_free_accounting) { 1672d3469faaSMark Maybee blkptr_t *bp = db->db_blkptr; 1673d3469faaSMark Maybee int64_t willfree = (bp && !BP_IS_HOLE(bp)) ? 1674b24ab676SJeff Bonwick bp_get_dsize(os->os_spa, bp) : db->db.db_size; 1675d3469faaSMark Maybee /* 1676d3469faaSMark Maybee * This is only a guess -- if the dbuf is dirty 1677d3469faaSMark Maybee * in a previous txg, we don't know how much 1678d3469faaSMark Maybee * space it will use on disk yet. We should 1679d3469faaSMark Maybee * really have the struct_rwlock to access 1680d3469faaSMark Maybee * db_blkptr, but since this is just a guess, 1681d3469faaSMark Maybee * it's OK if we get an odd answer. 1682d3469faaSMark Maybee */ 1683837b568bSGeorge Wilson ddt_prefetch(os->os_spa, bp); 1684d3469faaSMark Maybee dnode_willuse_space(dn, -willfree, tx); 1685fa9e4066Sahrens } 1686fa9e4066Sahrens 16878346f03fSJonathan W Adams if (db->db_level == 0) { 16888346f03fSJonathan W Adams dnode_new_blkid(dn, db->db_blkid, tx, drop_struct_lock); 16898346f03fSJonathan W Adams ASSERT(dn->dn_maxblkid >= db->db_blkid); 16908346f03fSJonathan W Adams } 16918346f03fSJonathan W Adams 169244eda4d7Smaybee if (db->db_level+1 < dn->dn_nlevels) { 1693c717a561Smaybee dmu_buf_impl_t *parent = db->db_parent; 1694c717a561Smaybee dbuf_dirty_record_t *di; 1695c717a561Smaybee int parent_held = FALSE; 1696c717a561Smaybee 1697c717a561Smaybee if (db->db_parent == NULL || db->db_parent == dn->dn_dbuf) { 1698fa9e4066Sahrens int epbs = dn->dn_indblkshift - SPA_BLKPTRSHIFT; 1699c717a561Smaybee 1700fa9e4066Sahrens parent = dbuf_hold_level(dn, db->db_level+1, 1701fa9e4066Sahrens db->db_blkid >> epbs, FTAG); 170201025c89SJohn Harres ASSERT(parent != NULL); 1703c717a561Smaybee parent_held = TRUE; 1704c717a561Smaybee } 1705fa9e4066Sahrens if (drop_struct_lock) 1706fa9e4066Sahrens rw_exit(&dn->dn_struct_rwlock); 1707c717a561Smaybee ASSERT3U(db->db_level+1, ==, parent->db_level); 1708c717a561Smaybee di = dbuf_dirty(parent, tx); 1709c717a561Smaybee if (parent_held) 1710ea8dc4b6Seschrock dbuf_rele(parent, FTAG); 1711c717a561Smaybee 1712c717a561Smaybee mutex_enter(&db->db_mtx); 171369962b56SMatthew Ahrens /* 171469962b56SMatthew Ahrens * Since we've dropped the mutex, it's possible that 171569962b56SMatthew Ahrens * dbuf_undirty() might have changed this out from under us. 171669962b56SMatthew Ahrens */ 1717c717a561Smaybee if (db->db_last_dirty == dr || 1718c717a561Smaybee dn->dn_object == DMU_META_DNODE_OBJECT) { 1719c717a561Smaybee mutex_enter(&di->dt.di.dr_mtx); 1720c717a561Smaybee ASSERT3U(di->dr_txg, ==, tx->tx_txg); 1721c717a561Smaybee ASSERT(!list_link_active(&dr->dr_dirty_node)); 1722c717a561Smaybee list_insert_tail(&di->dt.di.dr_children, dr); 1723c717a561Smaybee mutex_exit(&di->dt.di.dr_mtx); 1724c717a561Smaybee dr->dr_parent = di; 1725c717a561Smaybee } 1726c717a561Smaybee mutex_exit(&db->db_mtx); 1727fa9e4066Sahrens } else { 1728c717a561Smaybee ASSERT(db->db_level+1 == dn->dn_nlevels); 1729c717a561Smaybee ASSERT(db->db_blkid < dn->dn_nblkptr); 1730744947dcSTom Erickson ASSERT(db->db_parent == NULL || db->db_parent == dn->dn_dbuf); 1731c717a561Smaybee mutex_enter(&dn->dn_mtx); 1732c717a561Smaybee ASSERT(!list_link_active(&dr->dr_dirty_node)); 1733c717a561Smaybee list_insert_tail(&dn->dn_dirty_records[txgoff], dr); 1734c717a561Smaybee mutex_exit(&dn->dn_mtx); 1735fa9e4066Sahrens if (drop_struct_lock) 1736fa9e4066Sahrens rw_exit(&dn->dn_struct_rwlock); 1737fa9e4066Sahrens } 1738fa9e4066Sahrens 1739fa9e4066Sahrens dnode_setdirty(dn, tx); 1740744947dcSTom Erickson DB_DNODE_EXIT(db); 1741c717a561Smaybee return (dr); 1742fa9e4066Sahrens } 1743fa9e4066Sahrens 17443b2aab18SMatthew Ahrens /* 17453e30c24aSWill Andrews * Undirty a buffer in the transaction group referenced by the given 17463e30c24aSWill Andrews * transaction. Return whether this evicted the dbuf. 17473b2aab18SMatthew Ahrens */ 17483b2aab18SMatthew Ahrens static boolean_t 1749fa9e4066Sahrens dbuf_undirty(dmu_buf_impl_t *db, dmu_tx_t *tx) 1750fa9e4066Sahrens { 1751744947dcSTom Erickson dnode_t *dn; 1752c717a561Smaybee uint64_t txg = tx->tx_txg; 175317f17c2dSbonwick dbuf_dirty_record_t *dr, **drp; 1754fa9e4066Sahrens 1755c717a561Smaybee ASSERT(txg != 0); 175646e1baa6SMatthew Ahrens 175746e1baa6SMatthew Ahrens /* 175846e1baa6SMatthew Ahrens * Due to our use of dn_nlevels below, this can only be called 175946e1baa6SMatthew Ahrens * in open context, unless we are operating on the MOS. 176046e1baa6SMatthew Ahrens * From syncing context, dn_nlevels may be different from the 176146e1baa6SMatthew Ahrens * dn_nlevels used when dbuf was dirtied. 176246e1baa6SMatthew Ahrens */ 176346e1baa6SMatthew Ahrens ASSERT(db->db_objset == 176446e1baa6SMatthew Ahrens dmu_objset_pool(db->db_objset)->dp_meta_objset || 176546e1baa6SMatthew Ahrens txg != spa_syncing_txg(dmu_objset_spa(db->db_objset))); 17660a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 17673b2aab18SMatthew Ahrens ASSERT0(db->db_level); 17683b2aab18SMatthew Ahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 1769fa9e4066Sahrens 1770fa9e4066Sahrens /* 1771fa9e4066Sahrens * If this buffer is not dirty, we're done. 1772fa9e4066Sahrens */ 177317f17c2dSbonwick for (drp = &db->db_last_dirty; (dr = *drp) != NULL; drp = &dr->dr_next) 1774c717a561Smaybee if (dr->dr_txg <= txg) 1775c717a561Smaybee break; 17763b2aab18SMatthew Ahrens if (dr == NULL || dr->dr_txg < txg) 17773b2aab18SMatthew Ahrens return (B_FALSE); 1778c717a561Smaybee ASSERT(dr->dr_txg == txg); 1779b24ab676SJeff Bonwick ASSERT(dr->dr_dbuf == db); 1780fa9e4066Sahrens 1781744947dcSTom Erickson DB_DNODE_ENTER(db); 1782744947dcSTom Erickson dn = DB_DNODE(db); 1783744947dcSTom Erickson 1784fa9e4066Sahrens dprintf_dbuf(db, "size=%llx\n", (u_longlong_t)db->db.db_size); 1785fa9e4066Sahrens 1786fa9e4066Sahrens ASSERT(db->db.db_size != 0); 1787fa9e4066Sahrens 178846e1baa6SMatthew Ahrens dsl_pool_undirty_space(dmu_objset_pool(dn->dn_objset), 178946e1baa6SMatthew Ahrens dr->dr_accounted, txg); 1790fa9e4066Sahrens 179117f17c2dSbonwick *drp = dr->dr_next; 1792c717a561Smaybee 17933f2366c2SGordon Ross /* 17943f2366c2SGordon Ross * Note that there are three places in dbuf_dirty() 17953f2366c2SGordon Ross * where this dirty record may be put on a list. 17963f2366c2SGordon Ross * Make sure to do a list_remove corresponding to 17973f2366c2SGordon Ross * every one of those list_insert calls. 17983f2366c2SGordon Ross */ 1799c717a561Smaybee if (dr->dr_parent) { 1800c717a561Smaybee mutex_enter(&dr->dr_parent->dt.di.dr_mtx); 1801c717a561Smaybee list_remove(&dr->dr_parent->dt.di.dr_children, dr); 1802c717a561Smaybee mutex_exit(&dr->dr_parent->dt.di.dr_mtx); 18033f2366c2SGordon Ross } else if (db->db_blkid == DMU_SPILL_BLKID || 18043f2366c2SGordon Ross db->db_level + 1 == dn->dn_nlevels) { 1805cdb0ab79Smaybee ASSERT(db->db_blkptr == NULL || db->db_parent == dn->dn_dbuf); 1806fa9e4066Sahrens mutex_enter(&dn->dn_mtx); 1807c717a561Smaybee list_remove(&dn->dn_dirty_records[txg & TXG_MASK], dr); 1808fa9e4066Sahrens mutex_exit(&dn->dn_mtx); 1809c717a561Smaybee } 1810744947dcSTom Erickson DB_DNODE_EXIT(db); 1811c717a561Smaybee 181282c9918fSTim Haley if (db->db_state != DB_NOFILL) { 1813c717a561Smaybee dbuf_unoverride(dr); 1814c717a561Smaybee 1815c717a561Smaybee ASSERT(db->db_buf != NULL); 1816c717a561Smaybee ASSERT(dr->dt.dl.dr_data != NULL); 1817c717a561Smaybee if (dr->dt.dl.dr_data != db->db_buf) 1818dcbf3bd6SGeorge Wilson arc_buf_destroy(dr->dt.dl.dr_data, db); 1819c717a561Smaybee } 1820d2b3cbbdSJorgen Lundman 1821c717a561Smaybee kmem_free(dr, sizeof (dbuf_dirty_record_t)); 1822fa9e4066Sahrens 1823fa9e4066Sahrens ASSERT(db->db_dirtycnt > 0); 1824fa9e4066Sahrens db->db_dirtycnt -= 1; 1825fa9e4066Sahrens 1826c717a561Smaybee if (refcount_remove(&db->db_holds, (void *)(uintptr_t)txg) == 0) { 1827dcbf3bd6SGeorge Wilson ASSERT(db->db_state == DB_NOFILL || arc_released(db->db_buf)); 1828dcbf3bd6SGeorge Wilson dbuf_destroy(db); 18293b2aab18SMatthew Ahrens return (B_TRUE); 1830fa9e4066Sahrens } 1831fa9e4066Sahrens 18323b2aab18SMatthew Ahrens return (B_FALSE); 1833fa9e4066Sahrens } 1834fa9e4066Sahrens 1835fa9e4066Sahrens void 183643466aaeSMax Grossman dmu_buf_will_dirty(dmu_buf_t *db_fake, dmu_tx_t *tx) 1837fa9e4066Sahrens { 183843466aaeSMax Grossman dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 18391ab7f2deSmaybee int rf = DB_RF_MUST_SUCCEED | DB_RF_NOPREFETCH; 1840fa9e4066Sahrens 1841fa9e4066Sahrens ASSERT(tx->tx_txg != 0); 1842fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 1843fa9e4066Sahrens 18440f2e7d03SMatthew Ahrens /* 18450f2e7d03SMatthew Ahrens * Quick check for dirtyness. For already dirty blocks, this 18460f2e7d03SMatthew Ahrens * reduces runtime of this function by >90%, and overall performance 18470f2e7d03SMatthew Ahrens * by 50% for some workloads (e.g. file deletion with indirect blocks 18480f2e7d03SMatthew Ahrens * cached). 18490f2e7d03SMatthew Ahrens */ 18500f2e7d03SMatthew Ahrens mutex_enter(&db->db_mtx); 18510f2e7d03SMatthew Ahrens dbuf_dirty_record_t *dr; 18520f2e7d03SMatthew Ahrens for (dr = db->db_last_dirty; 18530f2e7d03SMatthew Ahrens dr != NULL && dr->dr_txg >= tx->tx_txg; dr = dr->dr_next) { 18540f2e7d03SMatthew Ahrens /* 18550f2e7d03SMatthew Ahrens * It's possible that it is already dirty but not cached, 18560f2e7d03SMatthew Ahrens * because there are some calls to dbuf_dirty() that don't 18570f2e7d03SMatthew Ahrens * go through dmu_buf_will_dirty(). 18580f2e7d03SMatthew Ahrens */ 18590f2e7d03SMatthew Ahrens if (dr->dr_txg == tx->tx_txg && db->db_state == DB_CACHED) { 18600f2e7d03SMatthew Ahrens /* This dbuf is already dirty and cached. */ 18610f2e7d03SMatthew Ahrens dbuf_redirty(dr); 18620f2e7d03SMatthew Ahrens mutex_exit(&db->db_mtx); 18630f2e7d03SMatthew Ahrens return; 18640f2e7d03SMatthew Ahrens } 18650f2e7d03SMatthew Ahrens } 18660f2e7d03SMatthew Ahrens mutex_exit(&db->db_mtx); 18670f2e7d03SMatthew Ahrens 1868744947dcSTom Erickson DB_DNODE_ENTER(db); 1869744947dcSTom Erickson if (RW_WRITE_HELD(&DB_DNODE(db)->dn_struct_rwlock)) 1870fa9e4066Sahrens rf |= DB_RF_HAVESTRUCT; 1871744947dcSTom Erickson DB_DNODE_EXIT(db); 1872ea8dc4b6Seschrock (void) dbuf_read(db, NULL, rf); 1873c717a561Smaybee (void) dbuf_dirty(db, tx); 1874fa9e4066Sahrens } 1875fa9e4066Sahrens 1876fa9e4066Sahrens void 187782c9918fSTim Haley dmu_buf_will_not_fill(dmu_buf_t *db_fake, dmu_tx_t *tx) 187882c9918fSTim Haley { 187982c9918fSTim Haley dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 188082c9918fSTim Haley 188182c9918fSTim Haley db->db_state = DB_NOFILL; 188282c9918fSTim Haley 188382c9918fSTim Haley dmu_buf_will_fill(db_fake, tx); 188482c9918fSTim Haley } 188582c9918fSTim Haley 188682c9918fSTim Haley void 1887ea8dc4b6Seschrock dmu_buf_will_fill(dmu_buf_t *db_fake, dmu_tx_t *tx) 1888fa9e4066Sahrens { 1889ea8dc4b6Seschrock dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 1890ea8dc4b6Seschrock 18910a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 1892fa9e4066Sahrens ASSERT(tx->tx_txg != 0); 1893fa9e4066Sahrens ASSERT(db->db_level == 0); 1894fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 1895fa9e4066Sahrens 1896ea8dc4b6Seschrock ASSERT(db->db.db_object != DMU_META_DNODE_OBJECT || 1897fa9e4066Sahrens dmu_tx_private_ok(tx)); 1898fa9e4066Sahrens 1899fa9e4066Sahrens dbuf_noread(db); 1900c717a561Smaybee (void) dbuf_dirty(db, tx); 1901fa9e4066Sahrens } 1902fa9e4066Sahrens 1903fa9e4066Sahrens #pragma weak dmu_buf_fill_done = dbuf_fill_done 1904fa9e4066Sahrens /* ARGSUSED */ 1905fa9e4066Sahrens void 1906fa9e4066Sahrens dbuf_fill_done(dmu_buf_impl_t *db, dmu_tx_t *tx) 1907fa9e4066Sahrens { 1908fa9e4066Sahrens mutex_enter(&db->db_mtx); 19099c9dc39aSek110237 DBUF_VERIFY(db); 1910fa9e4066Sahrens 1911fa9e4066Sahrens if (db->db_state == DB_FILL) { 1912c717a561Smaybee if (db->db_level == 0 && db->db_freed_in_flight) { 19130a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 1914fa9e4066Sahrens /* we were freed while filling */ 1915fa9e4066Sahrens /* XXX dbuf_undirty? */ 1916fa9e4066Sahrens bzero(db->db.db_data, db->db.db_size); 1917c717a561Smaybee db->db_freed_in_flight = FALSE; 1918fa9e4066Sahrens } 1919fa9e4066Sahrens db->db_state = DB_CACHED; 1920fa9e4066Sahrens cv_broadcast(&db->db_changed); 1921fa9e4066Sahrens } 1922fa9e4066Sahrens mutex_exit(&db->db_mtx); 1923fa9e4066Sahrens } 1924fa9e4066Sahrens 19255d7b4d43SMatthew Ahrens void 19265d7b4d43SMatthew Ahrens dmu_buf_write_embedded(dmu_buf_t *dbuf, void *data, 19275d7b4d43SMatthew Ahrens bp_embedded_type_t etype, enum zio_compress comp, 19285d7b4d43SMatthew Ahrens int uncompressed_size, int compressed_size, int byteorder, 19295d7b4d43SMatthew Ahrens dmu_tx_t *tx) 19305d7b4d43SMatthew Ahrens { 19315d7b4d43SMatthew Ahrens dmu_buf_impl_t *db = (dmu_buf_impl_t *)dbuf; 19325d7b4d43SMatthew Ahrens struct dirty_leaf *dl; 19335d7b4d43SMatthew Ahrens dmu_object_type_t type; 19345d7b4d43SMatthew Ahrens 1935ca0cc391SMatthew Ahrens if (etype == BP_EMBEDDED_TYPE_DATA) { 1936ca0cc391SMatthew Ahrens ASSERT(spa_feature_is_active(dmu_objset_spa(db->db_objset), 1937ca0cc391SMatthew Ahrens SPA_FEATURE_EMBEDDED_DATA)); 1938ca0cc391SMatthew Ahrens } 1939ca0cc391SMatthew Ahrens 19405d7b4d43SMatthew Ahrens DB_DNODE_ENTER(db); 19415d7b4d43SMatthew Ahrens type = DB_DNODE(db)->dn_type; 19425d7b4d43SMatthew Ahrens DB_DNODE_EXIT(db); 19435d7b4d43SMatthew Ahrens 19445d7b4d43SMatthew Ahrens ASSERT0(db->db_level); 19455d7b4d43SMatthew Ahrens ASSERT(db->db_blkid != DMU_BONUS_BLKID); 19465d7b4d43SMatthew Ahrens 19475d7b4d43SMatthew Ahrens dmu_buf_will_not_fill(dbuf, tx); 19485d7b4d43SMatthew Ahrens 19495d7b4d43SMatthew Ahrens ASSERT3U(db->db_last_dirty->dr_txg, ==, tx->tx_txg); 19505d7b4d43SMatthew Ahrens dl = &db->db_last_dirty->dt.dl; 19515d7b4d43SMatthew Ahrens encode_embedded_bp_compressed(&dl->dr_overridden_by, 19525d7b4d43SMatthew Ahrens data, comp, uncompressed_size, compressed_size); 19535d7b4d43SMatthew Ahrens BPE_SET_ETYPE(&dl->dr_overridden_by, etype); 19545d7b4d43SMatthew Ahrens BP_SET_TYPE(&dl->dr_overridden_by, type); 19555d7b4d43SMatthew Ahrens BP_SET_LEVEL(&dl->dr_overridden_by, 0); 19565d7b4d43SMatthew Ahrens BP_SET_BYTEORDER(&dl->dr_overridden_by, byteorder); 19575d7b4d43SMatthew Ahrens 19585d7b4d43SMatthew Ahrens dl->dr_override_state = DR_OVERRIDDEN; 19595d7b4d43SMatthew Ahrens dl->dr_overridden_by.blk_birth = db->db_last_dirty->dr_txg; 19605d7b4d43SMatthew Ahrens } 19615d7b4d43SMatthew Ahrens 1962ea8dc4b6Seschrock /* 19632fdbea25SAleksandr Guzovskiy * Directly assign a provided arc buf to a given dbuf if it's not referenced 19642fdbea25SAleksandr Guzovskiy * by anybody except our caller. Otherwise copy arcbuf's contents to dbuf. 19652fdbea25SAleksandr Guzovskiy */ 19662fdbea25SAleksandr Guzovskiy void 19672fdbea25SAleksandr Guzovskiy dbuf_assign_arcbuf(dmu_buf_impl_t *db, arc_buf_t *buf, dmu_tx_t *tx) 19682fdbea25SAleksandr Guzovskiy { 19692fdbea25SAleksandr Guzovskiy ASSERT(!refcount_is_zero(&db->db_holds)); 19700a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 19712fdbea25SAleksandr Guzovskiy ASSERT(db->db_level == 0); 19722fdbea25SAleksandr Guzovskiy ASSERT(DBUF_GET_BUFC_TYPE(db) == ARC_BUFC_DATA); 19732fdbea25SAleksandr Guzovskiy ASSERT(buf != NULL); 19742fdbea25SAleksandr Guzovskiy ASSERT(arc_buf_size(buf) == db->db.db_size); 19752fdbea25SAleksandr Guzovskiy ASSERT(tx->tx_txg != 0); 19762fdbea25SAleksandr Guzovskiy 19772fdbea25SAleksandr Guzovskiy arc_return_buf(buf, db); 19782fdbea25SAleksandr Guzovskiy ASSERT(arc_released(buf)); 19792fdbea25SAleksandr Guzovskiy 19802fdbea25SAleksandr Guzovskiy mutex_enter(&db->db_mtx); 19812fdbea25SAleksandr Guzovskiy 19822fdbea25SAleksandr Guzovskiy while (db->db_state == DB_READ || db->db_state == DB_FILL) 19832fdbea25SAleksandr Guzovskiy cv_wait(&db->db_changed, &db->db_mtx); 19842fdbea25SAleksandr Guzovskiy 19852fdbea25SAleksandr Guzovskiy ASSERT(db->db_state == DB_CACHED || db->db_state == DB_UNCACHED); 19862fdbea25SAleksandr Guzovskiy 19872fdbea25SAleksandr Guzovskiy if (db->db_state == DB_CACHED && 19882fdbea25SAleksandr Guzovskiy refcount_count(&db->db_holds) - 1 > db->db_dirtycnt) { 19892fdbea25SAleksandr Guzovskiy mutex_exit(&db->db_mtx); 19902fdbea25SAleksandr Guzovskiy (void) dbuf_dirty(db, tx); 19912fdbea25SAleksandr Guzovskiy bcopy(buf->b_data, db->db.db_data, db->db.db_size); 1992dcbf3bd6SGeorge Wilson arc_buf_destroy(buf, db); 1993c242f9a0Schunli zhang - Sun Microsystems - Irvine United States xuio_stat_wbuf_copied(); 19942fdbea25SAleksandr Guzovskiy return; 19952fdbea25SAleksandr Guzovskiy } 19962fdbea25SAleksandr Guzovskiy 1997c242f9a0Schunli zhang - Sun Microsystems - Irvine United States xuio_stat_wbuf_nocopy(); 19982fdbea25SAleksandr Guzovskiy if (db->db_state == DB_CACHED) { 19992fdbea25SAleksandr Guzovskiy dbuf_dirty_record_t *dr = db->db_last_dirty; 20002fdbea25SAleksandr Guzovskiy 20012fdbea25SAleksandr Guzovskiy ASSERT(db->db_buf != NULL); 20022fdbea25SAleksandr Guzovskiy if (dr != NULL && dr->dr_txg == tx->tx_txg) { 20032fdbea25SAleksandr Guzovskiy ASSERT(dr->dt.dl.dr_data == db->db_buf); 20042fdbea25SAleksandr Guzovskiy if (!arc_released(db->db_buf)) { 20052fdbea25SAleksandr Guzovskiy ASSERT(dr->dt.dl.dr_override_state == 20062fdbea25SAleksandr Guzovskiy DR_OVERRIDDEN); 20072fdbea25SAleksandr Guzovskiy arc_release(db->db_buf, db); 20082fdbea25SAleksandr Guzovskiy } 20092fdbea25SAleksandr Guzovskiy dr->dt.dl.dr_data = buf; 2010dcbf3bd6SGeorge Wilson arc_buf_destroy(db->db_buf, db); 20112fdbea25SAleksandr Guzovskiy } else if (dr == NULL || dr->dt.dl.dr_data != db->db_buf) { 20122fdbea25SAleksandr Guzovskiy arc_release(db->db_buf, db); 2013dcbf3bd6SGeorge Wilson arc_buf_destroy(db->db_buf, db); 20142fdbea25SAleksandr Guzovskiy } 20152fdbea25SAleksandr Guzovskiy db->db_buf = NULL; 20162fdbea25SAleksandr Guzovskiy } 20172fdbea25SAleksandr Guzovskiy ASSERT(db->db_buf == NULL); 20182fdbea25SAleksandr Guzovskiy dbuf_set_data(db, buf); 20192fdbea25SAleksandr Guzovskiy db->db_state = DB_FILL; 20202fdbea25SAleksandr Guzovskiy mutex_exit(&db->db_mtx); 20212fdbea25SAleksandr Guzovskiy (void) dbuf_dirty(db, tx); 202243466aaeSMax Grossman dmu_buf_fill_done(&db->db, tx); 20232fdbea25SAleksandr Guzovskiy } 20242fdbea25SAleksandr Guzovskiy 2025ea8dc4b6Seschrock void 2026dcbf3bd6SGeorge Wilson dbuf_destroy(dmu_buf_impl_t *db) 2027fa9e4066Sahrens { 2028744947dcSTom Erickson dnode_t *dn; 2029ea8dc4b6Seschrock dmu_buf_impl_t *parent = db->db_parent; 2030744947dcSTom Erickson dmu_buf_impl_t *dndb; 2031fa9e4066Sahrens 2032fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 2033fa9e4066Sahrens ASSERT(refcount_is_zero(&db->db_holds)); 2034fa9e4066Sahrens 2035dcbf3bd6SGeorge Wilson if (db->db_buf != NULL) { 2036dcbf3bd6SGeorge Wilson arc_buf_destroy(db->db_buf, db); 2037dcbf3bd6SGeorge Wilson db->db_buf = NULL; 2038dcbf3bd6SGeorge Wilson } 2039ea8dc4b6Seschrock 20400a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 2041dcbf3bd6SGeorge Wilson ASSERT(db->db.db_data != NULL); 2042ea8dc4b6Seschrock zio_buf_free(db->db.db_data, DN_MAX_BONUSLEN); 20435a98e54bSBrendan Gregg - Sun Microsystems arc_space_return(DN_MAX_BONUSLEN, ARC_SPACE_OTHER); 2044fa9e4066Sahrens db->db_state = DB_UNCACHED; 2045fa9e4066Sahrens } 2046fa9e4066Sahrens 2047dcbf3bd6SGeorge Wilson dbuf_clear_data(db); 2048dcbf3bd6SGeorge Wilson 2049dcbf3bd6SGeorge Wilson if (multilist_link_active(&db->db_cache_link)) { 2050dcbf3bd6SGeorge Wilson multilist_remove(&dbuf_cache, db); 2051dcbf3bd6SGeorge Wilson (void) refcount_remove_many(&dbuf_cache_size, 2052dcbf3bd6SGeorge Wilson db->db.db_size, db); 2053dcbf3bd6SGeorge Wilson } 2054dcbf3bd6SGeorge Wilson 205582c9918fSTim Haley ASSERT(db->db_state == DB_UNCACHED || db->db_state == DB_NOFILL); 2056fa9e4066Sahrens ASSERT(db->db_data_pending == NULL); 2057fa9e4066Sahrens 2058ea8dc4b6Seschrock db->db_state = DB_EVICTING; 2059ea8dc4b6Seschrock db->db_blkptr = NULL; 2060ea8dc4b6Seschrock 2061dcbf3bd6SGeorge Wilson /* 2062dcbf3bd6SGeorge Wilson * Now that db_state is DB_EVICTING, nobody else can find this via 2063dcbf3bd6SGeorge Wilson * the hash table. We can now drop db_mtx, which allows us to 2064dcbf3bd6SGeorge Wilson * acquire the dn_dbufs_mtx. 2065dcbf3bd6SGeorge Wilson */ 2066dcbf3bd6SGeorge Wilson mutex_exit(&db->db_mtx); 2067dcbf3bd6SGeorge Wilson 2068744947dcSTom Erickson DB_DNODE_ENTER(db); 2069744947dcSTom Erickson dn = DB_DNODE(db); 2070744947dcSTom Erickson dndb = dn->dn_dbuf; 2071dcbf3bd6SGeorge Wilson if (db->db_blkid != DMU_BONUS_BLKID) { 2072dcbf3bd6SGeorge Wilson boolean_t needlock = !MUTEX_HELD(&dn->dn_dbufs_mtx); 2073dcbf3bd6SGeorge Wilson if (needlock) 2074dcbf3bd6SGeorge Wilson mutex_enter(&dn->dn_dbufs_mtx); 20750f6d88adSAlex Reece avl_remove(&dn->dn_dbufs, db); 2076640c1670SJosef 'Jeff' Sipek atomic_dec_32(&dn->dn_dbufs_count); 2077744947dcSTom Erickson membar_producer(); 2078744947dcSTom Erickson DB_DNODE_EXIT(db); 2079dcbf3bd6SGeorge Wilson if (needlock) 2080dcbf3bd6SGeorge Wilson mutex_exit(&dn->dn_dbufs_mtx); 2081744947dcSTom Erickson /* 2082744947dcSTom Erickson * Decrementing the dbuf count means that the hold corresponding 2083744947dcSTom Erickson * to the removed dbuf is no longer discounted in dnode_move(), 2084744947dcSTom Erickson * so the dnode cannot be moved until after we release the hold. 2085744947dcSTom Erickson * The membar_producer() ensures visibility of the decremented 2086744947dcSTom Erickson * value in dnode_move(), since DB_DNODE_EXIT doesn't actually 2087744947dcSTom Erickson * release any lock. 2088744947dcSTom Erickson */ 2089ea8dc4b6Seschrock dnode_rele(dn, db); 2090744947dcSTom Erickson db->db_dnode_handle = NULL; 2091dcbf3bd6SGeorge Wilson 2092dcbf3bd6SGeorge Wilson dbuf_hash_remove(db); 2093744947dcSTom Erickson } else { 2094744947dcSTom Erickson DB_DNODE_EXIT(db); 2095ea8dc4b6Seschrock } 2096ea8dc4b6Seschrock 2097dcbf3bd6SGeorge Wilson ASSERT(refcount_is_zero(&db->db_holds)); 2098ea8dc4b6Seschrock 2099dcbf3bd6SGeorge Wilson db->db_parent = NULL; 2100dcbf3bd6SGeorge Wilson 2101dcbf3bd6SGeorge Wilson ASSERT(db->db_buf == NULL); 2102dcbf3bd6SGeorge Wilson ASSERT(db->db.db_data == NULL); 2103dcbf3bd6SGeorge Wilson ASSERT(db->db_hash_next == NULL); 2104dcbf3bd6SGeorge Wilson ASSERT(db->db_blkptr == NULL); 2105dcbf3bd6SGeorge Wilson ASSERT(db->db_data_pending == NULL); 2106dcbf3bd6SGeorge Wilson ASSERT(!multilist_link_active(&db->db_cache_link)); 2107dcbf3bd6SGeorge Wilson 2108dcbf3bd6SGeorge Wilson kmem_cache_free(dbuf_kmem_cache, db); 2109dcbf3bd6SGeorge Wilson arc_space_return(sizeof (dmu_buf_impl_t), ARC_SPACE_OTHER); 2110fa9e4066Sahrens 2111fa9e4066Sahrens /* 2112744947dcSTom Erickson * If this dbuf is referenced from an indirect dbuf, 2113fa9e4066Sahrens * decrement the ref count on the indirect dbuf. 2114fa9e4066Sahrens */ 2115c543ec06Sahrens if (parent && parent != dndb) 2116ea8dc4b6Seschrock dbuf_rele(parent, db); 2117fa9e4066Sahrens } 2118fa9e4066Sahrens 2119a2cdcdd2SPaul Dagnelie /* 2120a2cdcdd2SPaul Dagnelie * Note: While bpp will always be updated if the function returns success, 2121a2cdcdd2SPaul Dagnelie * parentp will not be updated if the dnode does not have dn_dbuf filled in; 2122a2cdcdd2SPaul Dagnelie * this happens when the dnode is the meta-dnode, or a userused or groupused 2123a2cdcdd2SPaul Dagnelie * object. 2124a2cdcdd2SPaul Dagnelie */ 2125fa9e4066Sahrens static int 2126fa9e4066Sahrens dbuf_findbp(dnode_t *dn, int level, uint64_t blkid, int fail_sparse, 2127fa9e4066Sahrens dmu_buf_impl_t **parentp, blkptr_t **bpp) 2128fa9e4066Sahrens { 2129fa9e4066Sahrens int nlevels, epbs; 2130fa9e4066Sahrens 21310b69c2f0Sahrens *parentp = NULL; 21320b69c2f0Sahrens *bpp = NULL; 21330b69c2f0Sahrens 21340a586ceaSMark Shellenbaum ASSERT(blkid != DMU_BONUS_BLKID); 21350a586ceaSMark Shellenbaum 21360a586ceaSMark Shellenbaum if (blkid == DMU_SPILL_BLKID) { 21370a586ceaSMark Shellenbaum mutex_enter(&dn->dn_mtx); 213806e0070dSMark Shellenbaum if (dn->dn_have_spill && 213906e0070dSMark Shellenbaum (dn->dn_phys->dn_flags & DNODE_FLAG_SPILL_BLKPTR)) 21400a586ceaSMark Shellenbaum *bpp = &dn->dn_phys->dn_spill; 21410a586ceaSMark Shellenbaum else 21420a586ceaSMark Shellenbaum *bpp = NULL; 21430a586ceaSMark Shellenbaum dbuf_add_ref(dn->dn_dbuf, NULL); 21440a586ceaSMark Shellenbaum *parentp = dn->dn_dbuf; 21450a586ceaSMark Shellenbaum mutex_exit(&dn->dn_mtx); 21460a586ceaSMark Shellenbaum return (0); 21470a586ceaSMark Shellenbaum } 2148ea8dc4b6Seschrock 2149fa9e4066Sahrens if (dn->dn_phys->dn_nlevels == 0) 2150fa9e4066Sahrens nlevels = 1; 2151fa9e4066Sahrens else 2152fa9e4066Sahrens nlevels = dn->dn_phys->dn_nlevels; 2153fa9e4066Sahrens 2154fa9e4066Sahrens epbs = dn->dn_indblkshift - SPA_BLKPTRSHIFT; 2155fa9e4066Sahrens 2156fa9e4066Sahrens ASSERT3U(level * epbs, <, 64); 2157fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 2158ea8dc4b6Seschrock if (level >= nlevels || 2159fa9e4066Sahrens (blkid > (dn->dn_phys->dn_maxblkid >> (level * epbs)))) { 2160fa9e4066Sahrens /* the buffer has no parent yet */ 2161be6fd75aSMatthew Ahrens return (SET_ERROR(ENOENT)); 2162fa9e4066Sahrens } else if (level < nlevels-1) { 2163fa9e4066Sahrens /* this block is referenced from an indirect block */ 2164fa9e4066Sahrens int err = dbuf_hold_impl(dn, level+1, 2165a2cdcdd2SPaul Dagnelie blkid >> epbs, fail_sparse, FALSE, NULL, parentp); 2166fa9e4066Sahrens if (err) 2167fa9e4066Sahrens return (err); 2168ea8dc4b6Seschrock err = dbuf_read(*parentp, NULL, 2169ea8dc4b6Seschrock (DB_RF_HAVESTRUCT | DB_RF_NOPREFETCH | DB_RF_CANFAIL)); 2170c543ec06Sahrens if (err) { 2171c543ec06Sahrens dbuf_rele(*parentp, NULL); 2172c543ec06Sahrens *parentp = NULL; 2173c543ec06Sahrens return (err); 2174c543ec06Sahrens } 2175fa9e4066Sahrens *bpp = ((blkptr_t *)(*parentp)->db.db_data) + 2176fa9e4066Sahrens (blkid & ((1ULL << epbs) - 1)); 2177c543ec06Sahrens return (0); 2178fa9e4066Sahrens } else { 2179fa9e4066Sahrens /* the block is referenced from the dnode */ 2180fa9e4066Sahrens ASSERT3U(level, ==, nlevels-1); 2181fa9e4066Sahrens ASSERT(dn->dn_phys->dn_nblkptr == 0 || 2182fa9e4066Sahrens blkid < dn->dn_phys->dn_nblkptr); 2183c543ec06Sahrens if (dn->dn_dbuf) { 2184c543ec06Sahrens dbuf_add_ref(dn->dn_dbuf, NULL); 2185fa9e4066Sahrens *parentp = dn->dn_dbuf; 2186c543ec06Sahrens } 2187fa9e4066Sahrens *bpp = &dn->dn_phys->dn_blkptr[blkid]; 2188fa9e4066Sahrens return (0); 2189fa9e4066Sahrens } 2190fa9e4066Sahrens } 2191fa9e4066Sahrens 2192fa9e4066Sahrens static dmu_buf_impl_t * 2193fa9e4066Sahrens dbuf_create(dnode_t *dn, uint8_t level, uint64_t blkid, 2194fa9e4066Sahrens dmu_buf_impl_t *parent, blkptr_t *blkptr) 2195fa9e4066Sahrens { 2196503ad85cSMatthew Ahrens objset_t *os = dn->dn_objset; 2197fa9e4066Sahrens dmu_buf_impl_t *db, *odb; 2198fa9e4066Sahrens 2199fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 2200fa9e4066Sahrens ASSERT(dn->dn_type != DMU_OT_NONE); 2201fa9e4066Sahrens 2202dcbf3bd6SGeorge Wilson db = kmem_cache_alloc(dbuf_kmem_cache, KM_SLEEP); 2203fa9e4066Sahrens 2204fa9e4066Sahrens db->db_objset = os; 2205fa9e4066Sahrens db->db.db_object = dn->dn_object; 2206fa9e4066Sahrens db->db_level = level; 2207fa9e4066Sahrens db->db_blkid = blkid; 2208c717a561Smaybee db->db_last_dirty = NULL; 2209ea8dc4b6Seschrock db->db_dirtycnt = 0; 2210744947dcSTom Erickson db->db_dnode_handle = dn->dn_handle; 2211ea8dc4b6Seschrock db->db_parent = parent; 2212ea8dc4b6Seschrock db->db_blkptr = blkptr; 2213fa9e4066Sahrens 2214bc9014e6SJustin Gibbs db->db_user = NULL; 2215d2058105SJustin T. Gibbs db->db_user_immediate_evict = FALSE; 2216d2058105SJustin T. Gibbs db->db_freed_in_flight = FALSE; 2217d2058105SJustin T. Gibbs db->db_pending_evict = FALSE; 2218ea8dc4b6Seschrock 22190a586ceaSMark Shellenbaum if (blkid == DMU_BONUS_BLKID) { 2220ea8dc4b6Seschrock ASSERT3P(parent, ==, dn->dn_dbuf); 22211934e92fSmaybee db->db.db_size = DN_MAX_BONUSLEN - 22221934e92fSmaybee (dn->dn_nblkptr-1) * sizeof (blkptr_t); 22231934e92fSmaybee ASSERT3U(db->db.db_size, >=, dn->dn_bonuslen); 22240a586ceaSMark Shellenbaum db->db.db_offset = DMU_BONUS_BLKID; 2225ea8dc4b6Seschrock db->db_state = DB_UNCACHED; 2226ea8dc4b6Seschrock /* the bonus dbuf is not placed in the hash table */ 22275a98e54bSBrendan Gregg - Sun Microsystems arc_space_consume(sizeof (dmu_buf_impl_t), ARC_SPACE_OTHER); 2228ea8dc4b6Seschrock return (db); 22290a586ceaSMark Shellenbaum } else if (blkid == DMU_SPILL_BLKID) { 22300a586ceaSMark Shellenbaum db->db.db_size = (blkptr != NULL) ? 22310a586ceaSMark Shellenbaum BP_GET_LSIZE(blkptr) : SPA_MINBLOCKSIZE; 22320a586ceaSMark Shellenbaum db->db.db_offset = 0; 2233fa9e4066Sahrens } else { 2234fa9e4066Sahrens int blocksize = 2235fa9e4066Sahrens db->db_level ? 1 << dn->dn_indblkshift : dn->dn_datablksz; 2236fa9e4066Sahrens db->db.db_size = blocksize; 2237fa9e4066Sahrens db->db.db_offset = db->db_blkid * blocksize; 2238fa9e4066Sahrens } 2239fa9e4066Sahrens 2240fa9e4066Sahrens /* 2241fa9e4066Sahrens * Hold the dn_dbufs_mtx while we get the new dbuf 2242fa9e4066Sahrens * in the hash table *and* added to the dbufs list. 2243fa9e4066Sahrens * This prevents a possible deadlock with someone 2244fa9e4066Sahrens * trying to look up this dbuf before its added to the 2245fa9e4066Sahrens * dn_dbufs list. 2246fa9e4066Sahrens */ 2247fa9e4066Sahrens mutex_enter(&dn->dn_dbufs_mtx); 2248ea8dc4b6Seschrock db->db_state = DB_EVICTING; 2249fa9e4066Sahrens if ((odb = dbuf_hash_insert(db)) != NULL) { 2250fa9e4066Sahrens /* someone else inserted it first */ 2251dcbf3bd6SGeorge Wilson kmem_cache_free(dbuf_kmem_cache, db); 2252fa9e4066Sahrens mutex_exit(&dn->dn_dbufs_mtx); 2253fa9e4066Sahrens return (odb); 2254fa9e4066Sahrens } 22550f6d88adSAlex Reece avl_add(&dn->dn_dbufs, db); 2256*653af1b8SStephen Blinick 2257ea8dc4b6Seschrock db->db_state = DB_UNCACHED; 2258fa9e4066Sahrens mutex_exit(&dn->dn_dbufs_mtx); 22595a98e54bSBrendan Gregg - Sun Microsystems arc_space_consume(sizeof (dmu_buf_impl_t), ARC_SPACE_OTHER); 2260fa9e4066Sahrens 2261fa9e4066Sahrens if (parent && parent != dn->dn_dbuf) 2262fa9e4066Sahrens dbuf_add_ref(parent, db); 2263fa9e4066Sahrens 2264ea8dc4b6Seschrock ASSERT(dn->dn_object == DMU_META_DNODE_OBJECT || 2265ea8dc4b6Seschrock refcount_count(&dn->dn_holds) > 0); 2266fa9e4066Sahrens (void) refcount_add(&dn->dn_holds, db); 2267640c1670SJosef 'Jeff' Sipek atomic_inc_32(&dn->dn_dbufs_count); 2268fa9e4066Sahrens 2269fa9e4066Sahrens dprintf_dbuf(db, "db=%p\n", db); 2270fa9e4066Sahrens 2271fa9e4066Sahrens return (db); 2272fa9e4066Sahrens } 2273fa9e4066Sahrens 2274a2cdcdd2SPaul Dagnelie typedef struct dbuf_prefetch_arg { 2275a2cdcdd2SPaul Dagnelie spa_t *dpa_spa; /* The spa to issue the prefetch in. */ 2276a2cdcdd2SPaul Dagnelie zbookmark_phys_t dpa_zb; /* The target block to prefetch. */ 2277a2cdcdd2SPaul Dagnelie int dpa_epbs; /* Entries (blkptr_t's) Per Block Shift. */ 2278a2cdcdd2SPaul Dagnelie int dpa_curlevel; /* The current level that we're reading */ 2279dcbf3bd6SGeorge Wilson dnode_t *dpa_dnode; /* The dnode associated with the prefetch */ 2280a2cdcdd2SPaul Dagnelie zio_priority_t dpa_prio; /* The priority I/Os should be issued at. */ 2281a2cdcdd2SPaul Dagnelie zio_t *dpa_zio; /* The parent zio_t for all prefetches. */ 2282a2cdcdd2SPaul Dagnelie arc_flags_t dpa_aflags; /* Flags to pass to the final prefetch. */ 2283a2cdcdd2SPaul Dagnelie } dbuf_prefetch_arg_t; 2284a2cdcdd2SPaul Dagnelie 2285a2cdcdd2SPaul Dagnelie /* 2286a2cdcdd2SPaul Dagnelie * Actually issue the prefetch read for the block given. 2287a2cdcdd2SPaul Dagnelie */ 2288a2cdcdd2SPaul Dagnelie static void 2289a2cdcdd2SPaul Dagnelie dbuf_issue_final_prefetch(dbuf_prefetch_arg_t *dpa, blkptr_t *bp) 2290fa9e4066Sahrens { 2291a2cdcdd2SPaul Dagnelie if (BP_IS_HOLE(bp) || BP_IS_EMBEDDED(bp)) 2292a2cdcdd2SPaul Dagnelie return; 2293a2cdcdd2SPaul Dagnelie 2294a2cdcdd2SPaul Dagnelie arc_flags_t aflags = 2295a2cdcdd2SPaul Dagnelie dpa->dpa_aflags | ARC_FLAG_NOWAIT | ARC_FLAG_PREFETCH; 2296a2cdcdd2SPaul Dagnelie 2297a2cdcdd2SPaul Dagnelie ASSERT3U(dpa->dpa_curlevel, ==, BP_GET_LEVEL(bp)); 2298a2cdcdd2SPaul Dagnelie ASSERT3U(dpa->dpa_curlevel, ==, dpa->dpa_zb.zb_level); 2299a2cdcdd2SPaul Dagnelie ASSERT(dpa->dpa_zio != NULL); 2300a2cdcdd2SPaul Dagnelie (void) arc_read(dpa->dpa_zio, dpa->dpa_spa, bp, NULL, NULL, 2301a2cdcdd2SPaul Dagnelie dpa->dpa_prio, ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE, 2302a2cdcdd2SPaul Dagnelie &aflags, &dpa->dpa_zb); 2303a2cdcdd2SPaul Dagnelie } 2304a2cdcdd2SPaul Dagnelie 2305a2cdcdd2SPaul Dagnelie /* 2306a2cdcdd2SPaul Dagnelie * Called when an indirect block above our prefetch target is read in. This 2307a2cdcdd2SPaul Dagnelie * will either read in the next indirect block down the tree or issue the actual 2308a2cdcdd2SPaul Dagnelie * prefetch if the next block down is our target. 2309a2cdcdd2SPaul Dagnelie */ 2310a2cdcdd2SPaul Dagnelie static void 2311a2cdcdd2SPaul Dagnelie dbuf_prefetch_indirect_done(zio_t *zio, arc_buf_t *abuf, void *private) 2312a2cdcdd2SPaul Dagnelie { 2313a2cdcdd2SPaul Dagnelie dbuf_prefetch_arg_t *dpa = private; 2314a2cdcdd2SPaul Dagnelie 2315a2cdcdd2SPaul Dagnelie ASSERT3S(dpa->dpa_zb.zb_level, <, dpa->dpa_curlevel); 2316a2cdcdd2SPaul Dagnelie ASSERT3S(dpa->dpa_curlevel, >, 0); 2317dcbf3bd6SGeorge Wilson 2318dcbf3bd6SGeorge Wilson /* 2319dcbf3bd6SGeorge Wilson * The dpa_dnode is only valid if we are called with a NULL 2320dcbf3bd6SGeorge Wilson * zio. This indicates that the arc_read() returned without 2321dcbf3bd6SGeorge Wilson * first calling zio_read() to issue a physical read. Once 2322dcbf3bd6SGeorge Wilson * a physical read is made the dpa_dnode must be invalidated 2323dcbf3bd6SGeorge Wilson * as the locks guarding it may have been dropped. If the 2324dcbf3bd6SGeorge Wilson * dpa_dnode is still valid, then we want to add it to the dbuf 2325dcbf3bd6SGeorge Wilson * cache. To do so, we must hold the dbuf associated with the block 2326dcbf3bd6SGeorge Wilson * we just prefetched, read its contents so that we associate it 2327dcbf3bd6SGeorge Wilson * with an arc_buf_t, and then release it. 2328dcbf3bd6SGeorge Wilson */ 2329a2cdcdd2SPaul Dagnelie if (zio != NULL) { 2330a2cdcdd2SPaul Dagnelie ASSERT3S(BP_GET_LEVEL(zio->io_bp), ==, dpa->dpa_curlevel); 2331dcbf3bd6SGeorge Wilson if (zio->io_flags & ZIO_FLAG_RAW) { 2332dcbf3bd6SGeorge Wilson ASSERT3U(BP_GET_PSIZE(zio->io_bp), ==, zio->io_size); 2333dcbf3bd6SGeorge Wilson } else { 2334a2cdcdd2SPaul Dagnelie ASSERT3U(BP_GET_LSIZE(zio->io_bp), ==, zio->io_size); 2335dcbf3bd6SGeorge Wilson } 2336a2cdcdd2SPaul Dagnelie ASSERT3P(zio->io_spa, ==, dpa->dpa_spa); 2337dcbf3bd6SGeorge Wilson 2338dcbf3bd6SGeorge Wilson dpa->dpa_dnode = NULL; 2339dcbf3bd6SGeorge Wilson } else if (dpa->dpa_dnode != NULL) { 2340dcbf3bd6SGeorge Wilson uint64_t curblkid = dpa->dpa_zb.zb_blkid >> 2341dcbf3bd6SGeorge Wilson (dpa->dpa_epbs * (dpa->dpa_curlevel - 2342dcbf3bd6SGeorge Wilson dpa->dpa_zb.zb_level)); 2343dcbf3bd6SGeorge Wilson dmu_buf_impl_t *db = dbuf_hold_level(dpa->dpa_dnode, 2344dcbf3bd6SGeorge Wilson dpa->dpa_curlevel, curblkid, FTAG); 2345dcbf3bd6SGeorge Wilson (void) dbuf_read(db, NULL, 2346dcbf3bd6SGeorge Wilson DB_RF_MUST_SUCCEED | DB_RF_NOPREFETCH | DB_RF_HAVESTRUCT); 2347dcbf3bd6SGeorge Wilson dbuf_rele(db, FTAG); 2348a2cdcdd2SPaul Dagnelie } 2349a2cdcdd2SPaul Dagnelie 2350a2cdcdd2SPaul Dagnelie dpa->dpa_curlevel--; 2351a2cdcdd2SPaul Dagnelie 2352a2cdcdd2SPaul Dagnelie uint64_t nextblkid = dpa->dpa_zb.zb_blkid >> 2353a2cdcdd2SPaul Dagnelie (dpa->dpa_epbs * (dpa->dpa_curlevel - dpa->dpa_zb.zb_level)); 2354a2cdcdd2SPaul Dagnelie blkptr_t *bp = ((blkptr_t *)abuf->b_data) + 2355a2cdcdd2SPaul Dagnelie P2PHASE(nextblkid, 1ULL << dpa->dpa_epbs); 2356a2cdcdd2SPaul Dagnelie if (BP_IS_HOLE(bp) || (zio != NULL && zio->io_error != 0)) { 2357a2cdcdd2SPaul Dagnelie kmem_free(dpa, sizeof (*dpa)); 2358a2cdcdd2SPaul Dagnelie } else if (dpa->dpa_curlevel == dpa->dpa_zb.zb_level) { 2359a2cdcdd2SPaul Dagnelie ASSERT3U(nextblkid, ==, dpa->dpa_zb.zb_blkid); 2360a2cdcdd2SPaul Dagnelie dbuf_issue_final_prefetch(dpa, bp); 2361a2cdcdd2SPaul Dagnelie kmem_free(dpa, sizeof (*dpa)); 2362a2cdcdd2SPaul Dagnelie } else { 2363a2cdcdd2SPaul Dagnelie arc_flags_t iter_aflags = ARC_FLAG_NOWAIT; 2364a2cdcdd2SPaul Dagnelie zbookmark_phys_t zb; 2365a2cdcdd2SPaul Dagnelie 2366a2cdcdd2SPaul Dagnelie ASSERT3U(dpa->dpa_curlevel, ==, BP_GET_LEVEL(bp)); 2367a2cdcdd2SPaul Dagnelie 2368a2cdcdd2SPaul Dagnelie SET_BOOKMARK(&zb, dpa->dpa_zb.zb_objset, 2369a2cdcdd2SPaul Dagnelie dpa->dpa_zb.zb_object, dpa->dpa_curlevel, nextblkid); 2370a2cdcdd2SPaul Dagnelie 2371a2cdcdd2SPaul Dagnelie (void) arc_read(dpa->dpa_zio, dpa->dpa_spa, 2372a2cdcdd2SPaul Dagnelie bp, dbuf_prefetch_indirect_done, dpa, dpa->dpa_prio, 2373a2cdcdd2SPaul Dagnelie ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE, 2374a2cdcdd2SPaul Dagnelie &iter_aflags, &zb); 2375a2cdcdd2SPaul Dagnelie } 2376dcbf3bd6SGeorge Wilson 2377dcbf3bd6SGeorge Wilson arc_buf_destroy(abuf, private); 2378a2cdcdd2SPaul Dagnelie } 2379a2cdcdd2SPaul Dagnelie 2380a2cdcdd2SPaul Dagnelie /* 2381a2cdcdd2SPaul Dagnelie * Issue prefetch reads for the given block on the given level. If the indirect 2382a2cdcdd2SPaul Dagnelie * blocks above that block are not in memory, we will read them in 2383a2cdcdd2SPaul Dagnelie * asynchronously. As a result, this call never blocks waiting for a read to 2384a2cdcdd2SPaul Dagnelie * complete. 2385a2cdcdd2SPaul Dagnelie */ 2386a2cdcdd2SPaul Dagnelie void 2387a2cdcdd2SPaul Dagnelie dbuf_prefetch(dnode_t *dn, int64_t level, uint64_t blkid, zio_priority_t prio, 2388a2cdcdd2SPaul Dagnelie arc_flags_t aflags) 2389a2cdcdd2SPaul Dagnelie { 2390a2cdcdd2SPaul Dagnelie blkptr_t bp; 2391a2cdcdd2SPaul Dagnelie int epbs, nlevels, curlevel; 2392a2cdcdd2SPaul Dagnelie uint64_t curblkid; 2393fa9e4066Sahrens 23940a586ceaSMark Shellenbaum ASSERT(blkid != DMU_BONUS_BLKID); 2395fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 2396fa9e4066Sahrens 2397cf6106c8SMatthew Ahrens if (blkid > dn->dn_maxblkid) 2398cf6106c8SMatthew Ahrens return; 2399cf6106c8SMatthew Ahrens 2400fa9e4066Sahrens if (dnode_block_freed(dn, blkid)) 2401fa9e4066Sahrens return; 2402fa9e4066Sahrens 2403fa9e4066Sahrens /* 2404a2cdcdd2SPaul Dagnelie * This dnode hasn't been written to disk yet, so there's nothing to 2405a2cdcdd2SPaul Dagnelie * prefetch. 2406fa9e4066Sahrens */ 2407a2cdcdd2SPaul Dagnelie nlevels = dn->dn_phys->dn_nlevels; 2408a2cdcdd2SPaul Dagnelie if (level >= nlevels || dn->dn_phys->dn_nblkptr == 0) 2409a2cdcdd2SPaul Dagnelie return; 2410a2cdcdd2SPaul Dagnelie 2411a2cdcdd2SPaul Dagnelie epbs = dn->dn_phys->dn_indblkshift - SPA_BLKPTRSHIFT; 2412a2cdcdd2SPaul Dagnelie if (dn->dn_phys->dn_maxblkid < blkid << (epbs * level)) 2413a2cdcdd2SPaul Dagnelie return; 2414a2cdcdd2SPaul Dagnelie 2415a2cdcdd2SPaul Dagnelie dmu_buf_impl_t *db = dbuf_find(dn->dn_objset, dn->dn_object, 2416a2cdcdd2SPaul Dagnelie level, blkid); 2417a2cdcdd2SPaul Dagnelie if (db != NULL) { 2418fa9e4066Sahrens mutex_exit(&db->db_mtx); 2419a2cdcdd2SPaul Dagnelie /* 2420a2cdcdd2SPaul Dagnelie * This dbuf already exists. It is either CACHED, or 2421a2cdcdd2SPaul Dagnelie * (we assume) about to be read or filled. 2422a2cdcdd2SPaul Dagnelie */ 2423fa9e4066Sahrens return; 2424fa9e4066Sahrens } 2425fa9e4066Sahrens 2426a2cdcdd2SPaul Dagnelie /* 2427a2cdcdd2SPaul Dagnelie * Find the closest ancestor (indirect block) of the target block 2428a2cdcdd2SPaul Dagnelie * that is present in the cache. In this indirect block, we will 2429a2cdcdd2SPaul Dagnelie * find the bp that is at curlevel, curblkid. 2430a2cdcdd2SPaul Dagnelie */ 2431a2cdcdd2SPaul Dagnelie curlevel = level; 2432a2cdcdd2SPaul Dagnelie curblkid = blkid; 2433a2cdcdd2SPaul Dagnelie while (curlevel < nlevels - 1) { 2434a2cdcdd2SPaul Dagnelie int parent_level = curlevel + 1; 2435a2cdcdd2SPaul Dagnelie uint64_t parent_blkid = curblkid >> epbs; 2436a2cdcdd2SPaul Dagnelie dmu_buf_impl_t *db; 2437a2cdcdd2SPaul Dagnelie 2438a2cdcdd2SPaul Dagnelie if (dbuf_hold_impl(dn, parent_level, parent_blkid, 2439a2cdcdd2SPaul Dagnelie FALSE, TRUE, FTAG, &db) == 0) { 2440a2cdcdd2SPaul Dagnelie blkptr_t *bpp = db->db_buf->b_data; 2441a2cdcdd2SPaul Dagnelie bp = bpp[P2PHASE(curblkid, 1 << epbs)]; 2442a2cdcdd2SPaul Dagnelie dbuf_rele(db, FTAG); 2443a2cdcdd2SPaul Dagnelie break; 2444a2cdcdd2SPaul Dagnelie } 2445a2cdcdd2SPaul Dagnelie 2446a2cdcdd2SPaul Dagnelie curlevel = parent_level; 2447a2cdcdd2SPaul Dagnelie curblkid = parent_blkid; 2448a2cdcdd2SPaul Dagnelie } 2449a2cdcdd2SPaul Dagnelie 2450a2cdcdd2SPaul Dagnelie if (curlevel == nlevels - 1) { 2451a2cdcdd2SPaul Dagnelie /* No cached indirect blocks found. */ 2452a2cdcdd2SPaul Dagnelie ASSERT3U(curblkid, <, dn->dn_phys->dn_nblkptr); 2453a2cdcdd2SPaul Dagnelie bp = dn->dn_phys->dn_blkptr[curblkid]; 2454a2cdcdd2SPaul Dagnelie } 2455a2cdcdd2SPaul Dagnelie if (BP_IS_HOLE(&bp)) 2456a2cdcdd2SPaul Dagnelie return; 2457a2cdcdd2SPaul Dagnelie 2458a2cdcdd2SPaul Dagnelie ASSERT3U(curlevel, ==, BP_GET_LEVEL(&bp)); 2459a2cdcdd2SPaul Dagnelie 2460a2cdcdd2SPaul Dagnelie zio_t *pio = zio_root(dmu_objset_spa(dn->dn_objset), NULL, NULL, 2461a2cdcdd2SPaul Dagnelie ZIO_FLAG_CANFAIL); 2462a2cdcdd2SPaul Dagnelie 2463a2cdcdd2SPaul Dagnelie dbuf_prefetch_arg_t *dpa = kmem_zalloc(sizeof (*dpa), KM_SLEEP); 2464b24ab676SJeff Bonwick dsl_dataset_t *ds = dn->dn_objset->os_dsl_dataset; 2465a2cdcdd2SPaul Dagnelie SET_BOOKMARK(&dpa->dpa_zb, ds != NULL ? ds->ds_object : DMU_META_OBJSET, 2466a2cdcdd2SPaul Dagnelie dn->dn_object, level, blkid); 2467a2cdcdd2SPaul Dagnelie dpa->dpa_curlevel = curlevel; 2468a2cdcdd2SPaul Dagnelie dpa->dpa_prio = prio; 2469a2cdcdd2SPaul Dagnelie dpa->dpa_aflags = aflags; 2470a2cdcdd2SPaul Dagnelie dpa->dpa_spa = dn->dn_objset->os_spa; 2471dcbf3bd6SGeorge Wilson dpa->dpa_dnode = dn; 2472a2cdcdd2SPaul Dagnelie dpa->dpa_epbs = epbs; 2473a2cdcdd2SPaul Dagnelie dpa->dpa_zio = pio; 2474a2cdcdd2SPaul Dagnelie 2475a2cdcdd2SPaul Dagnelie /* 2476a2cdcdd2SPaul Dagnelie * If we have the indirect just above us, no need to do the asynchronous 2477a2cdcdd2SPaul Dagnelie * prefetch chain; we'll just run the last step ourselves. If we're at 2478a2cdcdd2SPaul Dagnelie * a higher level, though, we want to issue the prefetches for all the 2479a2cdcdd2SPaul Dagnelie * indirect blocks asynchronously, so we can go on with whatever we were 2480a2cdcdd2SPaul Dagnelie * doing. 2481a2cdcdd2SPaul Dagnelie */ 2482a2cdcdd2SPaul Dagnelie if (curlevel == level) { 2483a2cdcdd2SPaul Dagnelie ASSERT3U(curblkid, ==, blkid); 2484a2cdcdd2SPaul Dagnelie dbuf_issue_final_prefetch(dpa, &bp); 2485a2cdcdd2SPaul Dagnelie kmem_free(dpa, sizeof (*dpa)); 2486a2cdcdd2SPaul Dagnelie } else { 2487a2cdcdd2SPaul Dagnelie arc_flags_t iter_aflags = ARC_FLAG_NOWAIT; 24887802d7bfSMatthew Ahrens zbookmark_phys_t zb; 2489b24ab676SJeff Bonwick 2490a2cdcdd2SPaul Dagnelie SET_BOOKMARK(&zb, ds != NULL ? ds->ds_object : DMU_META_OBJSET, 2491a2cdcdd2SPaul Dagnelie dn->dn_object, curlevel, curblkid); 2492a2cdcdd2SPaul Dagnelie (void) arc_read(dpa->dpa_zio, dpa->dpa_spa, 2493a2cdcdd2SPaul Dagnelie &bp, dbuf_prefetch_indirect_done, dpa, prio, 2494fa9e4066Sahrens ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE, 2495a2cdcdd2SPaul Dagnelie &iter_aflags, &zb); 2496fa9e4066Sahrens } 2497a2cdcdd2SPaul Dagnelie /* 2498a2cdcdd2SPaul Dagnelie * We use pio here instead of dpa_zio since it's possible that 2499a2cdcdd2SPaul Dagnelie * dpa may have already been freed. 2500a2cdcdd2SPaul Dagnelie */ 2501a2cdcdd2SPaul Dagnelie zio_nowait(pio); 2502fa9e4066Sahrens } 2503fa9e4066Sahrens 2504fa9e4066Sahrens /* 2505fa9e4066Sahrens * Returns with db_holds incremented, and db_mtx not held. 2506fa9e4066Sahrens * Note: dn_struct_rwlock must be held. 2507fa9e4066Sahrens */ 2508fa9e4066Sahrens int 2509a2cdcdd2SPaul Dagnelie dbuf_hold_impl(dnode_t *dn, uint8_t level, uint64_t blkid, 2510a2cdcdd2SPaul Dagnelie boolean_t fail_sparse, boolean_t fail_uncached, 2511fa9e4066Sahrens void *tag, dmu_buf_impl_t **dbp) 2512fa9e4066Sahrens { 2513fa9e4066Sahrens dmu_buf_impl_t *db, *parent = NULL; 2514fa9e4066Sahrens 25150a586ceaSMark Shellenbaum ASSERT(blkid != DMU_BONUS_BLKID); 2516fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 2517fa9e4066Sahrens ASSERT3U(dn->dn_nlevels, >, level); 2518fa9e4066Sahrens 2519fa9e4066Sahrens *dbp = NULL; 2520ea8dc4b6Seschrock top: 2521fa9e4066Sahrens /* dbuf_find() returns with db_mtx held */ 2522e57a022bSJustin T. Gibbs db = dbuf_find(dn->dn_objset, dn->dn_object, level, blkid); 2523fa9e4066Sahrens 2524fa9e4066Sahrens if (db == NULL) { 2525fa9e4066Sahrens blkptr_t *bp = NULL; 2526fa9e4066Sahrens int err; 2527fa9e4066Sahrens 2528a2cdcdd2SPaul Dagnelie if (fail_uncached) 2529a2cdcdd2SPaul Dagnelie return (SET_ERROR(ENOENT)); 2530a2cdcdd2SPaul Dagnelie 2531c543ec06Sahrens ASSERT3P(parent, ==, NULL); 2532fa9e4066Sahrens err = dbuf_findbp(dn, level, blkid, fail_sparse, &parent, &bp); 2533fa9e4066Sahrens if (fail_sparse) { 2534fa9e4066Sahrens if (err == 0 && bp && BP_IS_HOLE(bp)) 2535be6fd75aSMatthew Ahrens err = SET_ERROR(ENOENT); 2536fa9e4066Sahrens if (err) { 2537c543ec06Sahrens if (parent) 2538ea8dc4b6Seschrock dbuf_rele(parent, NULL); 2539fa9e4066Sahrens return (err); 2540fa9e4066Sahrens } 2541fa9e4066Sahrens } 2542ea8dc4b6Seschrock if (err && err != ENOENT) 2543ea8dc4b6Seschrock return (err); 2544fa9e4066Sahrens db = dbuf_create(dn, level, blkid, parent, bp); 2545fa9e4066Sahrens } 2546fa9e4066Sahrens 2547a2cdcdd2SPaul Dagnelie if (fail_uncached && db->db_state != DB_CACHED) { 2548a2cdcdd2SPaul Dagnelie mutex_exit(&db->db_mtx); 2549a2cdcdd2SPaul Dagnelie return (SET_ERROR(ENOENT)); 2550a2cdcdd2SPaul Dagnelie } 2551a2cdcdd2SPaul Dagnelie 2552dcbf3bd6SGeorge Wilson if (db->db_buf != NULL) 2553ea8dc4b6Seschrock ASSERT3P(db->db.db_data, ==, db->db_buf->b_data); 2554ea8dc4b6Seschrock 2555ea8dc4b6Seschrock ASSERT(db->db_buf == NULL || arc_referenced(db->db_buf)); 2556ea8dc4b6Seschrock 2557fa9e4066Sahrens /* 2558c717a561Smaybee * If this buffer is currently syncing out, and we are are 2559c717a561Smaybee * still referencing it from db_data, we need to make a copy 2560c717a561Smaybee * of it in case we decide we want to dirty it again in this txg. 2561fa9e4066Sahrens */ 25620a586ceaSMark Shellenbaum if (db->db_level == 0 && db->db_blkid != DMU_BONUS_BLKID && 2563ea8dc4b6Seschrock dn->dn_object != DMU_META_DNODE_OBJECT && 2564c717a561Smaybee db->db_state == DB_CACHED && db->db_data_pending) { 2565c717a561Smaybee dbuf_dirty_record_t *dr = db->db_data_pending; 2566c717a561Smaybee 2567c717a561Smaybee if (dr->dt.dl.dr_data == db->db_buf) { 2568ad23a2dbSjohansen arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 2569fa9e4066Sahrens 2570c717a561Smaybee dbuf_set_data(db, 2571dcbf3bd6SGeorge Wilson arc_alloc_buf(dn->dn_objset->os_spa, 2572c717a561Smaybee db->db.db_size, db, type)); 2573c717a561Smaybee bcopy(dr->dt.dl.dr_data->b_data, db->db.db_data, 2574fa9e4066Sahrens db->db.db_size); 2575fa9e4066Sahrens } 2576c717a561Smaybee } 2577fa9e4066Sahrens 2578dcbf3bd6SGeorge Wilson if (multilist_link_active(&db->db_cache_link)) { 2579dcbf3bd6SGeorge Wilson ASSERT(refcount_is_zero(&db->db_holds)); 2580dcbf3bd6SGeorge Wilson multilist_remove(&dbuf_cache, db); 2581dcbf3bd6SGeorge Wilson (void) refcount_remove_many(&dbuf_cache_size, 2582dcbf3bd6SGeorge Wilson db->db.db_size, db); 2583dcbf3bd6SGeorge Wilson } 2584ea8dc4b6Seschrock (void) refcount_add(&db->db_holds, tag); 25859c9dc39aSek110237 DBUF_VERIFY(db); 2586fa9e4066Sahrens mutex_exit(&db->db_mtx); 2587fa9e4066Sahrens 2588fa9e4066Sahrens /* NOTE: we can't rele the parent until after we drop the db_mtx */ 2589c543ec06Sahrens if (parent) 2590ea8dc4b6Seschrock dbuf_rele(parent, NULL); 2591fa9e4066Sahrens 2592744947dcSTom Erickson ASSERT3P(DB_DNODE(db), ==, dn); 2593fa9e4066Sahrens ASSERT3U(db->db_blkid, ==, blkid); 2594fa9e4066Sahrens ASSERT3U(db->db_level, ==, level); 2595fa9e4066Sahrens *dbp = db; 2596fa9e4066Sahrens 2597fa9e4066Sahrens return (0); 2598fa9e4066Sahrens } 2599fa9e4066Sahrens 2600fa9e4066Sahrens dmu_buf_impl_t * 2601ea8dc4b6Seschrock dbuf_hold(dnode_t *dn, uint64_t blkid, void *tag) 2602fa9e4066Sahrens { 2603a2cdcdd2SPaul Dagnelie return (dbuf_hold_level(dn, 0, blkid, tag)); 2604fa9e4066Sahrens } 2605fa9e4066Sahrens 2606fa9e4066Sahrens dmu_buf_impl_t * 2607fa9e4066Sahrens dbuf_hold_level(dnode_t *dn, int level, uint64_t blkid, void *tag) 2608fa9e4066Sahrens { 2609fa9e4066Sahrens dmu_buf_impl_t *db; 2610a2cdcdd2SPaul Dagnelie int err = dbuf_hold_impl(dn, level, blkid, FALSE, FALSE, tag, &db); 2611ea8dc4b6Seschrock return (err ? NULL : db); 2612fa9e4066Sahrens } 2613fa9e4066Sahrens 26141934e92fSmaybee void 2615ea8dc4b6Seschrock dbuf_create_bonus(dnode_t *dn) 2616fa9e4066Sahrens { 2617ea8dc4b6Seschrock ASSERT(RW_WRITE_HELD(&dn->dn_struct_rwlock)); 2618ea8dc4b6Seschrock 2619ea8dc4b6Seschrock ASSERT(dn->dn_bonus == NULL); 26200a586ceaSMark Shellenbaum dn->dn_bonus = dbuf_create(dn, 0, DMU_BONUS_BLKID, dn->dn_dbuf, NULL); 26210a586ceaSMark Shellenbaum } 26220a586ceaSMark Shellenbaum 26230a586ceaSMark Shellenbaum int 26240a586ceaSMark Shellenbaum dbuf_spill_set_blksz(dmu_buf_t *db_fake, uint64_t blksz, dmu_tx_t *tx) 26250a586ceaSMark Shellenbaum { 26260a586ceaSMark Shellenbaum dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 2627744947dcSTom Erickson dnode_t *dn; 2628744947dcSTom Erickson 26290a586ceaSMark Shellenbaum if (db->db_blkid != DMU_SPILL_BLKID) 2630be6fd75aSMatthew Ahrens return (SET_ERROR(ENOTSUP)); 26310a586ceaSMark Shellenbaum if (blksz == 0) 26320a586ceaSMark Shellenbaum blksz = SPA_MINBLOCKSIZE; 2633b5152584SMatthew Ahrens ASSERT3U(blksz, <=, spa_maxblocksize(dmu_objset_spa(db->db_objset))); 26340a586ceaSMark Shellenbaum blksz = P2ROUNDUP(blksz, SPA_MINBLOCKSIZE); 26350a586ceaSMark Shellenbaum 2636744947dcSTom Erickson DB_DNODE_ENTER(db); 2637744947dcSTom Erickson dn = DB_DNODE(db); 2638744947dcSTom Erickson rw_enter(&dn->dn_struct_rwlock, RW_WRITER); 26390a586ceaSMark Shellenbaum dbuf_new_size(db, blksz, tx); 2640744947dcSTom Erickson rw_exit(&dn->dn_struct_rwlock); 2641744947dcSTom Erickson DB_DNODE_EXIT(db); 26420a586ceaSMark Shellenbaum 26430a586ceaSMark Shellenbaum return (0); 26440a586ceaSMark Shellenbaum } 26450a586ceaSMark Shellenbaum 26460a586ceaSMark Shellenbaum void 26470a586ceaSMark Shellenbaum dbuf_rm_spill(dnode_t *dn, dmu_tx_t *tx) 26480a586ceaSMark Shellenbaum { 26490a586ceaSMark Shellenbaum dbuf_free_range(dn, DMU_SPILL_BLKID, DMU_SPILL_BLKID, tx); 2650fa9e4066Sahrens } 2651fa9e4066Sahrens 2652ea8dc4b6Seschrock #pragma weak dmu_buf_add_ref = dbuf_add_ref 2653fa9e4066Sahrens void 2654fa9e4066Sahrens dbuf_add_ref(dmu_buf_impl_t *db, void *tag) 2655fa9e4066Sahrens { 2656ea8dc4b6Seschrock int64_t holds = refcount_add(&db->db_holds, tag); 2657dcbf3bd6SGeorge Wilson ASSERT3S(holds, >, 1); 2658fa9e4066Sahrens } 2659fa9e4066Sahrens 2660e57a022bSJustin T. Gibbs #pragma weak dmu_buf_try_add_ref = dbuf_try_add_ref 2661e57a022bSJustin T. Gibbs boolean_t 2662e57a022bSJustin T. Gibbs dbuf_try_add_ref(dmu_buf_t *db_fake, objset_t *os, uint64_t obj, uint64_t blkid, 2663e57a022bSJustin T. Gibbs void *tag) 2664e57a022bSJustin T. Gibbs { 2665e57a022bSJustin T. Gibbs dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 2666e57a022bSJustin T. Gibbs dmu_buf_impl_t *found_db; 2667e57a022bSJustin T. Gibbs boolean_t result = B_FALSE; 2668e57a022bSJustin T. Gibbs 2669e57a022bSJustin T. Gibbs if (db->db_blkid == DMU_BONUS_BLKID) 2670e57a022bSJustin T. Gibbs found_db = dbuf_find_bonus(os, obj); 2671e57a022bSJustin T. Gibbs else 2672e57a022bSJustin T. Gibbs found_db = dbuf_find(os, obj, 0, blkid); 2673e57a022bSJustin T. Gibbs 2674e57a022bSJustin T. Gibbs if (found_db != NULL) { 2675e57a022bSJustin T. Gibbs if (db == found_db && dbuf_refcount(db) > db->db_dirtycnt) { 2676e57a022bSJustin T. Gibbs (void) refcount_add(&db->db_holds, tag); 2677e57a022bSJustin T. Gibbs result = B_TRUE; 2678e57a022bSJustin T. Gibbs } 2679e57a022bSJustin T. Gibbs mutex_exit(&db->db_mtx); 2680e57a022bSJustin T. Gibbs } 2681e57a022bSJustin T. Gibbs return (result); 2682e57a022bSJustin T. Gibbs } 2683e57a022bSJustin T. Gibbs 2684744947dcSTom Erickson /* 2685744947dcSTom Erickson * If you call dbuf_rele() you had better not be referencing the dnode handle 2686744947dcSTom Erickson * unless you have some other direct or indirect hold on the dnode. (An indirect 2687744947dcSTom Erickson * hold is a hold on one of the dnode's dbufs, including the bonus buffer.) 2688744947dcSTom Erickson * Without that, the dbuf_rele() could lead to a dnode_rele() followed by the 2689744947dcSTom Erickson * dnode's parent dbuf evicting its dnode handles. 2690744947dcSTom Erickson */ 2691fa9e4066Sahrens void 2692ea8dc4b6Seschrock dbuf_rele(dmu_buf_impl_t *db, void *tag) 2693fa9e4066Sahrens { 2694b24ab676SJeff Bonwick mutex_enter(&db->db_mtx); 2695b24ab676SJeff Bonwick dbuf_rele_and_unlock(db, tag); 2696b24ab676SJeff Bonwick } 2697b24ab676SJeff Bonwick 269843466aaeSMax Grossman void 269943466aaeSMax Grossman dmu_buf_rele(dmu_buf_t *db, void *tag) 270043466aaeSMax Grossman { 270143466aaeSMax Grossman dbuf_rele((dmu_buf_impl_t *)db, tag); 270243466aaeSMax Grossman } 270343466aaeSMax Grossman 2704b24ab676SJeff Bonwick /* 2705b24ab676SJeff Bonwick * dbuf_rele() for an already-locked dbuf. This is necessary to allow 2706b24ab676SJeff Bonwick * db_dirtycnt and db_holds to be updated atomically. 2707b24ab676SJeff Bonwick */ 2708b24ab676SJeff Bonwick void 2709b24ab676SJeff Bonwick dbuf_rele_and_unlock(dmu_buf_impl_t *db, void *tag) 2710b24ab676SJeff Bonwick { 2711fa9e4066Sahrens int64_t holds; 2712fa9e4066Sahrens 2713b24ab676SJeff Bonwick ASSERT(MUTEX_HELD(&db->db_mtx)); 27149c9dc39aSek110237 DBUF_VERIFY(db); 2715fa9e4066Sahrens 2716744947dcSTom Erickson /* 2717744947dcSTom Erickson * Remove the reference to the dbuf before removing its hold on the 2718744947dcSTom Erickson * dnode so we can guarantee in dnode_move() that a referenced bonus 2719744947dcSTom Erickson * buffer has a corresponding dnode hold. 2720744947dcSTom Erickson */ 2721fa9e4066Sahrens holds = refcount_remove(&db->db_holds, tag); 2722ea8dc4b6Seschrock ASSERT(holds >= 0); 2723fa9e4066Sahrens 2724c717a561Smaybee /* 2725c717a561Smaybee * We can't freeze indirects if there is a possibility that they 2726c717a561Smaybee * may be modified in the current syncing context. 2727c717a561Smaybee */ 2728dcbf3bd6SGeorge Wilson if (db->db_buf != NULL && 2729dcbf3bd6SGeorge Wilson holds == (db->db_level == 0 ? db->db_dirtycnt : 0)) { 27306b4acc8bSahrens arc_buf_freeze(db->db_buf); 2731dcbf3bd6SGeorge Wilson } 27326b4acc8bSahrens 2733fa9e4066Sahrens if (holds == db->db_dirtycnt && 2734d2058105SJustin T. Gibbs db->db_level == 0 && db->db_user_immediate_evict) 2735fa9e4066Sahrens dbuf_evict_user(db); 2736ea8dc4b6Seschrock 2737ea8dc4b6Seschrock if (holds == 0) { 27380a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 2739cd485b49SJustin T. Gibbs dnode_t *dn; 2740d2058105SJustin T. Gibbs boolean_t evict_dbuf = db->db_pending_evict; 2741cd485b49SJustin T. Gibbs 2742cd485b49SJustin T. Gibbs /* 2743cd485b49SJustin T. Gibbs * If the dnode moves here, we cannot cross this 2744cd485b49SJustin T. Gibbs * barrier until the move completes. 2745cd485b49SJustin T. Gibbs */ 2746cd485b49SJustin T. Gibbs DB_DNODE_ENTER(db); 2747cd485b49SJustin T. Gibbs 2748cd485b49SJustin T. Gibbs dn = DB_DNODE(db); 2749cd485b49SJustin T. Gibbs atomic_dec_32(&dn->dn_dbufs_count); 2750cd485b49SJustin T. Gibbs 2751cd485b49SJustin T. Gibbs /* 2752cd485b49SJustin T. Gibbs * Decrementing the dbuf count means that the bonus 2753cd485b49SJustin T. Gibbs * buffer's dnode hold is no longer discounted in 2754cd485b49SJustin T. Gibbs * dnode_move(). The dnode cannot move until after 2755d2058105SJustin T. Gibbs * the dnode_rele() below. 2756cd485b49SJustin T. Gibbs */ 2757cd485b49SJustin T. Gibbs DB_DNODE_EXIT(db); 2758cd485b49SJustin T. Gibbs 2759cd485b49SJustin T. Gibbs /* 2760cd485b49SJustin T. Gibbs * Do not reference db after its lock is dropped. 2761cd485b49SJustin T. Gibbs * Another thread may evict it. 2762cd485b49SJustin T. Gibbs */ 2763ea8dc4b6Seschrock mutex_exit(&db->db_mtx); 2764744947dcSTom Erickson 2765d2058105SJustin T. Gibbs if (evict_dbuf) 2766cd485b49SJustin T. Gibbs dnode_evict_bonus(dn); 2767d2058105SJustin T. Gibbs 2768d2058105SJustin T. Gibbs dnode_rele(dn, db); 2769ea8dc4b6Seschrock } else if (db->db_buf == NULL) { 2770ea8dc4b6Seschrock /* 2771ea8dc4b6Seschrock * This is a special case: we never associated this 2772ea8dc4b6Seschrock * dbuf with any data allocated from the ARC. 2773ea8dc4b6Seschrock */ 277482c9918fSTim Haley ASSERT(db->db_state == DB_UNCACHED || 277582c9918fSTim Haley db->db_state == DB_NOFILL); 2776dcbf3bd6SGeorge Wilson dbuf_destroy(db); 2777ea8dc4b6Seschrock } else if (arc_released(db->db_buf)) { 2778ea8dc4b6Seschrock /* 2779ea8dc4b6Seschrock * This dbuf has anonymous data associated with it. 2780ea8dc4b6Seschrock */ 2781dcbf3bd6SGeorge Wilson dbuf_destroy(db); 2782ea8dc4b6Seschrock } else { 2783dcbf3bd6SGeorge Wilson boolean_t do_arc_evict = B_FALSE; 2784dcbf3bd6SGeorge Wilson blkptr_t bp; 2785dcbf3bd6SGeorge Wilson spa_t *spa = dmu_objset_spa(db->db_objset); 27869253d63dSGeorge Wilson 2787dcbf3bd6SGeorge Wilson if (!DBUF_IS_CACHEABLE(db) && 2788dcbf3bd6SGeorge Wilson db->db_blkptr != NULL && 2789bbfa8ea8SMatthew Ahrens !BP_IS_HOLE(db->db_blkptr) && 2790bbfa8ea8SMatthew Ahrens !BP_IS_EMBEDDED(db->db_blkptr)) { 2791dcbf3bd6SGeorge Wilson do_arc_evict = B_TRUE; 2792dcbf3bd6SGeorge Wilson bp = *db->db_blkptr; 2793dcbf3bd6SGeorge Wilson } 2794dcbf3bd6SGeorge Wilson 2795dcbf3bd6SGeorge Wilson if (!DBUF_IS_CACHEABLE(db) || 2796dcbf3bd6SGeorge Wilson db->db_pending_evict) { 2797dcbf3bd6SGeorge Wilson dbuf_destroy(db); 2798dcbf3bd6SGeorge Wilson } else if (!multilist_link_active(&db->db_cache_link)) { 2799dcbf3bd6SGeorge Wilson multilist_insert(&dbuf_cache, db); 2800dcbf3bd6SGeorge Wilson (void) refcount_add_many(&dbuf_cache_size, 2801dcbf3bd6SGeorge Wilson db->db.db_size, db); 2802dcbf3bd6SGeorge Wilson mutex_exit(&db->db_mtx); 2803dcbf3bd6SGeorge Wilson 2804dcbf3bd6SGeorge Wilson dbuf_evict_notify(); 2805dcbf3bd6SGeorge Wilson } 2806dcbf3bd6SGeorge Wilson 2807dcbf3bd6SGeorge Wilson if (do_arc_evict) 2808bbfa8ea8SMatthew Ahrens arc_freed(spa, &bp); 2809bbfa8ea8SMatthew Ahrens } 2810ea8dc4b6Seschrock } else { 2811ea8dc4b6Seschrock mutex_exit(&db->db_mtx); 2812fa9e4066Sahrens } 2813dcbf3bd6SGeorge Wilson 2814fa9e4066Sahrens } 2815fa9e4066Sahrens 2816fa9e4066Sahrens #pragma weak dmu_buf_refcount = dbuf_refcount 2817fa9e4066Sahrens uint64_t 2818fa9e4066Sahrens dbuf_refcount(dmu_buf_impl_t *db) 2819fa9e4066Sahrens { 2820fa9e4066Sahrens return (refcount_count(&db->db_holds)); 2821fa9e4066Sahrens } 2822fa9e4066Sahrens 2823fa9e4066Sahrens void * 2824bc9014e6SJustin Gibbs dmu_buf_replace_user(dmu_buf_t *db_fake, dmu_buf_user_t *old_user, 2825bc9014e6SJustin Gibbs dmu_buf_user_t *new_user) 2826fa9e4066Sahrens { 2827bc9014e6SJustin Gibbs dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 2828bc9014e6SJustin Gibbs 2829bc9014e6SJustin Gibbs mutex_enter(&db->db_mtx); 2830bc9014e6SJustin Gibbs dbuf_verify_user(db, DBVU_NOT_EVICTING); 2831bc9014e6SJustin Gibbs if (db->db_user == old_user) 2832bc9014e6SJustin Gibbs db->db_user = new_user; 2833bc9014e6SJustin Gibbs else 2834bc9014e6SJustin Gibbs old_user = db->db_user; 2835bc9014e6SJustin Gibbs dbuf_verify_user(db, DBVU_NOT_EVICTING); 2836bc9014e6SJustin Gibbs mutex_exit(&db->db_mtx); 2837bc9014e6SJustin Gibbs 2838bc9014e6SJustin Gibbs return (old_user); 2839fa9e4066Sahrens } 2840fa9e4066Sahrens 2841fa9e4066Sahrens void * 2842bc9014e6SJustin Gibbs dmu_buf_set_user(dmu_buf_t *db_fake, dmu_buf_user_t *user) 2843bc9014e6SJustin Gibbs { 2844bc9014e6SJustin Gibbs return (dmu_buf_replace_user(db_fake, NULL, user)); 2845bc9014e6SJustin Gibbs } 2846bc9014e6SJustin Gibbs 2847bc9014e6SJustin Gibbs void * 2848bc9014e6SJustin Gibbs dmu_buf_set_user_ie(dmu_buf_t *db_fake, dmu_buf_user_t *user) 2849fa9e4066Sahrens { 2850fa9e4066Sahrens dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 2851fa9e4066Sahrens 2852d2058105SJustin T. Gibbs db->db_user_immediate_evict = TRUE; 2853bc9014e6SJustin Gibbs return (dmu_buf_set_user(db_fake, user)); 2854fa9e4066Sahrens } 2855fa9e4066Sahrens 2856fa9e4066Sahrens void * 2857bc9014e6SJustin Gibbs dmu_buf_remove_user(dmu_buf_t *db_fake, dmu_buf_user_t *user) 2858fa9e4066Sahrens { 2859bc9014e6SJustin Gibbs return (dmu_buf_replace_user(db_fake, user, NULL)); 2860fa9e4066Sahrens } 2861fa9e4066Sahrens 2862fa9e4066Sahrens void * 2863fa9e4066Sahrens dmu_buf_get_user(dmu_buf_t *db_fake) 2864fa9e4066Sahrens { 2865fa9e4066Sahrens dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 2866fa9e4066Sahrens 2867bc9014e6SJustin Gibbs dbuf_verify_user(db, DBVU_NOT_EVICTING); 2868bc9014e6SJustin Gibbs return (db->db_user); 2869bc9014e6SJustin Gibbs } 2870bc9014e6SJustin Gibbs 2871bc9014e6SJustin Gibbs void 2872bc9014e6SJustin Gibbs dmu_buf_user_evict_wait() 2873bc9014e6SJustin Gibbs { 2874bc9014e6SJustin Gibbs taskq_wait(dbu_evict_taskq); 2875fa9e4066Sahrens } 2876fa9e4066Sahrens 28773d692628SSanjeev Bagewadi boolean_t 28783d692628SSanjeev Bagewadi dmu_buf_freeable(dmu_buf_t *dbuf) 28793d692628SSanjeev Bagewadi { 28803d692628SSanjeev Bagewadi boolean_t res = B_FALSE; 28813d692628SSanjeev Bagewadi dmu_buf_impl_t *db = (dmu_buf_impl_t *)dbuf; 28823d692628SSanjeev Bagewadi 28833d692628SSanjeev Bagewadi if (db->db_blkptr) 28843d692628SSanjeev Bagewadi res = dsl_dataset_block_freeable(db->db_objset->os_dsl_dataset, 2885c7cd2421SGeorge Wilson db->db_blkptr, db->db_blkptr->blk_birth); 28863d692628SSanjeev Bagewadi 28873d692628SSanjeev Bagewadi return (res); 28883d692628SSanjeev Bagewadi } 28893d692628SSanjeev Bagewadi 289080901aeaSGeorge Wilson blkptr_t * 289180901aeaSGeorge Wilson dmu_buf_get_blkptr(dmu_buf_t *db) 289280901aeaSGeorge Wilson { 289380901aeaSGeorge Wilson dmu_buf_impl_t *dbi = (dmu_buf_impl_t *)db; 289480901aeaSGeorge Wilson return (dbi->db_blkptr); 289580901aeaSGeorge Wilson } 289680901aeaSGeorge Wilson 2897ae972795SMatthew Ahrens objset_t * 2898ae972795SMatthew Ahrens dmu_buf_get_objset(dmu_buf_t *db) 2899ae972795SMatthew Ahrens { 2900ae972795SMatthew Ahrens dmu_buf_impl_t *dbi = (dmu_buf_impl_t *)db; 2901ae972795SMatthew Ahrens return (dbi->db_objset); 2902ae972795SMatthew Ahrens } 2903ae972795SMatthew Ahrens 290479d72832SMatthew Ahrens dnode_t * 290579d72832SMatthew Ahrens dmu_buf_dnode_enter(dmu_buf_t *db) 290679d72832SMatthew Ahrens { 290779d72832SMatthew Ahrens dmu_buf_impl_t *dbi = (dmu_buf_impl_t *)db; 290879d72832SMatthew Ahrens DB_DNODE_ENTER(dbi); 290979d72832SMatthew Ahrens return (DB_DNODE(dbi)); 291079d72832SMatthew Ahrens } 291179d72832SMatthew Ahrens 291279d72832SMatthew Ahrens void 291379d72832SMatthew Ahrens dmu_buf_dnode_exit(dmu_buf_t *db) 291479d72832SMatthew Ahrens { 291579d72832SMatthew Ahrens dmu_buf_impl_t *dbi = (dmu_buf_impl_t *)db; 291679d72832SMatthew Ahrens DB_DNODE_EXIT(dbi); 291779d72832SMatthew Ahrens } 291879d72832SMatthew Ahrens 2919c717a561Smaybee static void 2920c717a561Smaybee dbuf_check_blkptr(dnode_t *dn, dmu_buf_impl_t *db) 2921fa9e4066Sahrens { 2922c717a561Smaybee /* ASSERT(dmu_tx_is_syncing(tx) */ 2923c717a561Smaybee ASSERT(MUTEX_HELD(&db->db_mtx)); 2924c717a561Smaybee 2925c717a561Smaybee if (db->db_blkptr != NULL) 2926c717a561Smaybee return; 2927c717a561Smaybee 29280a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) { 29290a586ceaSMark Shellenbaum db->db_blkptr = &dn->dn_phys->dn_spill; 29300a586ceaSMark Shellenbaum BP_ZERO(db->db_blkptr); 29310a586ceaSMark Shellenbaum return; 29320a586ceaSMark Shellenbaum } 2933c717a561Smaybee if (db->db_level == dn->dn_phys->dn_nlevels-1) { 2934c717a561Smaybee /* 2935c717a561Smaybee * This buffer was allocated at a time when there was 2936c717a561Smaybee * no available blkptrs from the dnode, or it was 2937c717a561Smaybee * inappropriate to hook it in (i.e., nlevels mis-match). 2938c717a561Smaybee */ 2939c717a561Smaybee ASSERT(db->db_blkid < dn->dn_phys->dn_nblkptr); 2940c717a561Smaybee ASSERT(db->db_parent == NULL); 2941c717a561Smaybee db->db_parent = dn->dn_dbuf; 2942c717a561Smaybee db->db_blkptr = &dn->dn_phys->dn_blkptr[db->db_blkid]; 2943c717a561Smaybee DBUF_VERIFY(db); 2944c717a561Smaybee } else { 2945c717a561Smaybee dmu_buf_impl_t *parent = db->db_parent; 2946c717a561Smaybee int epbs = dn->dn_phys->dn_indblkshift - SPA_BLKPTRSHIFT; 2947c717a561Smaybee 2948c717a561Smaybee ASSERT(dn->dn_phys->dn_nlevels > 1); 2949c717a561Smaybee if (parent == NULL) { 2950c717a561Smaybee mutex_exit(&db->db_mtx); 2951c717a561Smaybee rw_enter(&dn->dn_struct_rwlock, RW_READER); 2952a2cdcdd2SPaul Dagnelie parent = dbuf_hold_level(dn, db->db_level + 1, 2953a2cdcdd2SPaul Dagnelie db->db_blkid >> epbs, db); 2954c717a561Smaybee rw_exit(&dn->dn_struct_rwlock); 2955c717a561Smaybee mutex_enter(&db->db_mtx); 2956c717a561Smaybee db->db_parent = parent; 2957c717a561Smaybee } 2958c717a561Smaybee db->db_blkptr = (blkptr_t *)parent->db.db_data + 2959c717a561Smaybee (db->db_blkid & ((1ULL << epbs) - 1)); 2960c717a561Smaybee DBUF_VERIFY(db); 2961c717a561Smaybee } 2962c717a561Smaybee } 2963c717a561Smaybee 2964c717a561Smaybee static void 2965c717a561Smaybee dbuf_sync_indirect(dbuf_dirty_record_t *dr, dmu_tx_t *tx) 2966c717a561Smaybee { 2967c717a561Smaybee dmu_buf_impl_t *db = dr->dr_dbuf; 2968744947dcSTom Erickson dnode_t *dn; 2969c717a561Smaybee zio_t *zio; 2970c717a561Smaybee 2971c717a561Smaybee ASSERT(dmu_tx_is_syncing(tx)); 2972c717a561Smaybee 2973c717a561Smaybee dprintf_dbuf_bp(db, db->db_blkptr, "blkptr=%p", db->db_blkptr); 2974c717a561Smaybee 2975c717a561Smaybee mutex_enter(&db->db_mtx); 2976c717a561Smaybee 2977c717a561Smaybee ASSERT(db->db_level > 0); 2978c717a561Smaybee DBUF_VERIFY(db); 2979c717a561Smaybee 29803e30c24aSWill Andrews /* Read the block if it hasn't been read yet. */ 2981c717a561Smaybee if (db->db_buf == NULL) { 2982c717a561Smaybee mutex_exit(&db->db_mtx); 2983c717a561Smaybee (void) dbuf_read(db, NULL, DB_RF_MUST_SUCCEED); 2984c717a561Smaybee mutex_enter(&db->db_mtx); 2985c717a561Smaybee } 2986c717a561Smaybee ASSERT3U(db->db_state, ==, DB_CACHED); 2987c717a561Smaybee ASSERT(db->db_buf != NULL); 2988c717a561Smaybee 2989744947dcSTom Erickson DB_DNODE_ENTER(db); 2990744947dcSTom Erickson dn = DB_DNODE(db); 29913e30c24aSWill Andrews /* Indirect block size must match what the dnode thinks it is. */ 2992744947dcSTom Erickson ASSERT3U(db->db.db_size, ==, 1<<dn->dn_phys->dn_indblkshift); 2993c717a561Smaybee dbuf_check_blkptr(dn, db); 2994744947dcSTom Erickson DB_DNODE_EXIT(db); 2995c717a561Smaybee 29963e30c24aSWill Andrews /* Provide the pending dirty record to child dbufs */ 2997c717a561Smaybee db->db_data_pending = dr; 2998c717a561Smaybee 2999af2c4821Smaybee mutex_exit(&db->db_mtx); 3000088f3894Sahrens dbuf_write(dr, db->db_buf, tx); 3001c717a561Smaybee 3002c717a561Smaybee zio = dr->dr_zio; 3003c717a561Smaybee mutex_enter(&dr->dt.di.dr_mtx); 300446e1baa6SMatthew Ahrens dbuf_sync_list(&dr->dt.di.dr_children, db->db_level - 1, tx); 3005c717a561Smaybee ASSERT(list_head(&dr->dt.di.dr_children) == NULL); 3006c717a561Smaybee mutex_exit(&dr->dt.di.dr_mtx); 3007c717a561Smaybee zio_nowait(zio); 3008c717a561Smaybee } 3009c717a561Smaybee 3010c717a561Smaybee static void 3011c717a561Smaybee dbuf_sync_leaf(dbuf_dirty_record_t *dr, dmu_tx_t *tx) 3012c717a561Smaybee { 3013c717a561Smaybee arc_buf_t **datap = &dr->dt.dl.dr_data; 3014c717a561Smaybee dmu_buf_impl_t *db = dr->dr_dbuf; 3015744947dcSTom Erickson dnode_t *dn; 3016744947dcSTom Erickson objset_t *os; 3017c717a561Smaybee uint64_t txg = tx->tx_txg; 3018fa9e4066Sahrens 3019fa9e4066Sahrens ASSERT(dmu_tx_is_syncing(tx)); 3020fa9e4066Sahrens 3021fa9e4066Sahrens dprintf_dbuf_bp(db, db->db_blkptr, "blkptr=%p", db->db_blkptr); 3022fa9e4066Sahrens 3023fa9e4066Sahrens mutex_enter(&db->db_mtx); 3024fa9e4066Sahrens /* 3025fa9e4066Sahrens * To be synced, we must be dirtied. But we 3026fa9e4066Sahrens * might have been freed after the dirty. 3027fa9e4066Sahrens */ 3028fa9e4066Sahrens if (db->db_state == DB_UNCACHED) { 3029fa9e4066Sahrens /* This buffer has been freed since it was dirtied */ 3030fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 3031fa9e4066Sahrens } else if (db->db_state == DB_FILL) { 3032fa9e4066Sahrens /* This buffer was freed and is now being re-filled */ 3033c717a561Smaybee ASSERT(db->db.db_data != dr->dt.dl.dr_data); 3034fa9e4066Sahrens } else { 303582c9918fSTim Haley ASSERT(db->db_state == DB_CACHED || db->db_state == DB_NOFILL); 3036fa9e4066Sahrens } 30379c9dc39aSek110237 DBUF_VERIFY(db); 3038fa9e4066Sahrens 3039744947dcSTom Erickson DB_DNODE_ENTER(db); 3040744947dcSTom Erickson dn = DB_DNODE(db); 3041744947dcSTom Erickson 30420a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) { 30430a586ceaSMark Shellenbaum mutex_enter(&dn->dn_mtx); 30440a586ceaSMark Shellenbaum dn->dn_phys->dn_flags |= DNODE_FLAG_SPILL_BLKPTR; 30450a586ceaSMark Shellenbaum mutex_exit(&dn->dn_mtx); 30460a586ceaSMark Shellenbaum } 30470a586ceaSMark Shellenbaum 3048fa9e4066Sahrens /* 3049c717a561Smaybee * If this is a bonus buffer, simply copy the bonus data into the 3050c717a561Smaybee * dnode. It will be written out when the dnode is synced (and it 3051c717a561Smaybee * will be synced, since it must have been dirty for dbuf_sync to 3052c717a561Smaybee * be called). 3053fa9e4066Sahrens */ 30540a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 3055c717a561Smaybee dbuf_dirty_record_t **drp; 30561934e92fSmaybee 3057ea8dc4b6Seschrock ASSERT(*datap != NULL); 3058fb09f5aaSMadhav Suresh ASSERT0(db->db_level); 3059ea8dc4b6Seschrock ASSERT3U(dn->dn_phys->dn_bonuslen, <=, DN_MAX_BONUSLEN); 3060ea8dc4b6Seschrock bcopy(*datap, DN_BONUS(dn->dn_phys), dn->dn_phys->dn_bonuslen); 3061744947dcSTom Erickson DB_DNODE_EXIT(db); 3062744947dcSTom Erickson 30630e8c6158Smaybee if (*datap != db->db.db_data) { 3064ea8dc4b6Seschrock zio_buf_free(*datap, DN_MAX_BONUSLEN); 30655a98e54bSBrendan Gregg - Sun Microsystems arc_space_return(DN_MAX_BONUSLEN, ARC_SPACE_OTHER); 30660e8c6158Smaybee } 3067ea8dc4b6Seschrock db->db_data_pending = NULL; 3068c717a561Smaybee drp = &db->db_last_dirty; 3069c717a561Smaybee while (*drp != dr) 3070c717a561Smaybee drp = &(*drp)->dr_next; 307117f17c2dSbonwick ASSERT(dr->dr_next == NULL); 3072b24ab676SJeff Bonwick ASSERT(dr->dr_dbuf == db); 307317f17c2dSbonwick *drp = dr->dr_next; 3074c717a561Smaybee kmem_free(dr, sizeof (dbuf_dirty_record_t)); 3075ea8dc4b6Seschrock ASSERT(db->db_dirtycnt > 0); 3076ea8dc4b6Seschrock db->db_dirtycnt -= 1; 3077b24ab676SJeff Bonwick dbuf_rele_and_unlock(db, (void *)(uintptr_t)txg); 3078ea8dc4b6Seschrock return; 3079ea8dc4b6Seschrock } 3080ea8dc4b6Seschrock 3081744947dcSTom Erickson os = dn->dn_objset; 3082744947dcSTom Erickson 3083c5c6ffa0Smaybee /* 3084f82bfe17Sgw25295 * This function may have dropped the db_mtx lock allowing a dmu_sync 3085f82bfe17Sgw25295 * operation to sneak in. As a result, we need to ensure that we 3086f82bfe17Sgw25295 * don't check the dr_override_state until we have returned from 3087f82bfe17Sgw25295 * dbuf_check_blkptr. 3088f82bfe17Sgw25295 */ 3089f82bfe17Sgw25295 dbuf_check_blkptr(dn, db); 3090f82bfe17Sgw25295 3091f82bfe17Sgw25295 /* 3092744947dcSTom Erickson * If this buffer is in the middle of an immediate write, 3093c717a561Smaybee * wait for the synchronous IO to complete. 3094c5c6ffa0Smaybee */ 3095c717a561Smaybee while (dr->dt.dl.dr_override_state == DR_IN_DMU_SYNC) { 3096c5c6ffa0Smaybee ASSERT(dn->dn_object != DMU_META_DNODE_OBJECT); 3097c5c6ffa0Smaybee cv_wait(&db->db_changed, &db->db_mtx); 3098c717a561Smaybee ASSERT(dr->dt.dl.dr_override_state != DR_NOT_OVERRIDDEN); 3099c5c6ffa0Smaybee } 3100c717a561Smaybee 3101ab69d62fSMatthew Ahrens if (db->db_state != DB_NOFILL && 3102ab69d62fSMatthew Ahrens dn->dn_object != DMU_META_DNODE_OBJECT && 3103ab69d62fSMatthew Ahrens refcount_count(&db->db_holds) > 1 && 3104b24ab676SJeff Bonwick dr->dt.dl.dr_override_state != DR_OVERRIDDEN && 3105ab69d62fSMatthew Ahrens *datap == db->db_buf) { 3106fa9e4066Sahrens /* 310782c9918fSTim Haley * If this buffer is currently "in use" (i.e., there 310882c9918fSTim Haley * are active holds and db_data still references it), 310982c9918fSTim Haley * then make a copy before we start the write so that 311082c9918fSTim Haley * any modifications from the open txg will not leak 311182c9918fSTim Haley * into this write. 3112fa9e4066Sahrens * 311382c9918fSTim Haley * NOTE: this copy does not need to be made for 311482c9918fSTim Haley * objects only modified in the syncing context (e.g. 311582c9918fSTim Haley * DNONE_DNODE blocks). 3116fa9e4066Sahrens */ 3117ab69d62fSMatthew Ahrens int blksz = arc_buf_size(*datap); 3118ab69d62fSMatthew Ahrens arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 3119dcbf3bd6SGeorge Wilson *datap = arc_alloc_buf(os->os_spa, blksz, db, type); 3120c717a561Smaybee bcopy(db->db.db_data, (*datap)->b_data, blksz); 3121fa9e4066Sahrens } 3122c717a561Smaybee db->db_data_pending = dr; 3123fa9e4066Sahrens 3124fa9e4066Sahrens mutex_exit(&db->db_mtx); 3125fa9e4066Sahrens 3126088f3894Sahrens dbuf_write(dr, *datap, tx); 3127c717a561Smaybee 3128c717a561Smaybee ASSERT(!list_link_active(&dr->dr_dirty_node)); 3129744947dcSTom Erickson if (dn->dn_object == DMU_META_DNODE_OBJECT) { 3130c717a561Smaybee list_insert_tail(&dn->dn_dirty_records[txg&TXG_MASK], dr); 3131744947dcSTom Erickson DB_DNODE_EXIT(db); 3132744947dcSTom Erickson } else { 3133744947dcSTom Erickson /* 3134744947dcSTom Erickson * Although zio_nowait() does not "wait for an IO", it does 3135744947dcSTom Erickson * initiate the IO. If this is an empty write it seems plausible 3136744947dcSTom Erickson * that the IO could actually be completed before the nowait 3137744947dcSTom Erickson * returns. We need to DB_DNODE_EXIT() first in case 3138744947dcSTom Erickson * zio_nowait() invalidates the dbuf. 3139744947dcSTom Erickson */ 3140744947dcSTom Erickson DB_DNODE_EXIT(db); 3141c717a561Smaybee zio_nowait(dr->dr_zio); 3142fa9e4066Sahrens } 3143744947dcSTom Erickson } 3144c717a561Smaybee 3145c717a561Smaybee void 314646e1baa6SMatthew Ahrens dbuf_sync_list(list_t *list, int level, dmu_tx_t *tx) 3147c717a561Smaybee { 3148c717a561Smaybee dbuf_dirty_record_t *dr; 3149c717a561Smaybee 3150c717a561Smaybee while (dr = list_head(list)) { 3151c717a561Smaybee if (dr->dr_zio != NULL) { 3152c717a561Smaybee /* 3153c717a561Smaybee * If we find an already initialized zio then we 3154c717a561Smaybee * are processing the meta-dnode, and we have finished. 3155c717a561Smaybee * The dbufs for all dnodes are put back on the list 3156c717a561Smaybee * during processing, so that we can zio_wait() 3157c717a561Smaybee * these IOs after initiating all child IOs. 3158c717a561Smaybee */ 3159c717a561Smaybee ASSERT3U(dr->dr_dbuf->db.db_object, ==, 3160c717a561Smaybee DMU_META_DNODE_OBJECT); 3161c717a561Smaybee break; 3162fa9e4066Sahrens } 316346e1baa6SMatthew Ahrens if (dr->dr_dbuf->db_blkid != DMU_BONUS_BLKID && 316446e1baa6SMatthew Ahrens dr->dr_dbuf->db_blkid != DMU_SPILL_BLKID) { 316546e1baa6SMatthew Ahrens VERIFY3U(dr->dr_dbuf->db_level, ==, level); 316646e1baa6SMatthew Ahrens } 3167c717a561Smaybee list_remove(list, dr); 3168c717a561Smaybee if (dr->dr_dbuf->db_level > 0) 3169c717a561Smaybee dbuf_sync_indirect(dr, tx); 3170c717a561Smaybee else 3171c717a561Smaybee dbuf_sync_leaf(dr, tx); 3172c717a561Smaybee } 3173c717a561Smaybee } 3174c717a561Smaybee 3175fa9e4066Sahrens /* ARGSUSED */ 3176fa9e4066Sahrens static void 3177c717a561Smaybee dbuf_write_ready(zio_t *zio, arc_buf_t *buf, void *vdb) 3178fa9e4066Sahrens { 3179fa9e4066Sahrens dmu_buf_impl_t *db = vdb; 3180744947dcSTom Erickson dnode_t *dn; 3181e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 3182c717a561Smaybee blkptr_t *bp_orig = &zio->io_bp_orig; 3183b24ab676SJeff Bonwick spa_t *spa = zio->io_spa; 3184b24ab676SJeff Bonwick int64_t delta; 3185fa9e4066Sahrens uint64_t fill = 0; 3186b24ab676SJeff Bonwick int i; 3187fa9e4066Sahrens 318811ceac77SAlex Reece ASSERT3P(db->db_blkptr, !=, NULL); 318911ceac77SAlex Reece ASSERT3P(&db->db_data_pending->dr_bp_copy, ==, bp); 3190e14bb325SJeff Bonwick 3191744947dcSTom Erickson DB_DNODE_ENTER(db); 3192744947dcSTom Erickson dn = DB_DNODE(db); 3193b24ab676SJeff Bonwick delta = bp_get_dsize_sync(spa, bp) - bp_get_dsize_sync(spa, bp_orig); 3194b24ab676SJeff Bonwick dnode_diduse_space(dn, delta - zio->io_prev_space_delta); 3195b24ab676SJeff Bonwick zio->io_prev_space_delta = delta; 3196fa9e4066Sahrens 319743466aaeSMax Grossman if (bp->blk_birth != 0) { 31980a586ceaSMark Shellenbaum ASSERT((db->db_blkid != DMU_SPILL_BLKID && 31990a586ceaSMark Shellenbaum BP_GET_TYPE(bp) == dn->dn_type) || 32000a586ceaSMark Shellenbaum (db->db_blkid == DMU_SPILL_BLKID && 32015d7b4d43SMatthew Ahrens BP_GET_TYPE(bp) == dn->dn_bonustype) || 32025d7b4d43SMatthew Ahrens BP_IS_EMBEDDED(bp)); 3203e14bb325SJeff Bonwick ASSERT(BP_GET_LEVEL(bp) == db->db_level); 320443466aaeSMax Grossman } 3205e14bb325SJeff Bonwick 3206fa9e4066Sahrens mutex_enter(&db->db_mtx); 3207fa9e4066Sahrens 32080a586ceaSMark Shellenbaum #ifdef ZFS_DEBUG 32090a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) { 32100a586ceaSMark Shellenbaum ASSERT(dn->dn_phys->dn_flags & DNODE_FLAG_SPILL_BLKPTR); 321111ceac77SAlex Reece ASSERT(!(BP_IS_HOLE(bp)) && 32120a586ceaSMark Shellenbaum db->db_blkptr == &dn->dn_phys->dn_spill); 32130a586ceaSMark Shellenbaum } 32140a586ceaSMark Shellenbaum #endif 32150a586ceaSMark Shellenbaum 3216fa9e4066Sahrens if (db->db_level == 0) { 3217fa9e4066Sahrens mutex_enter(&dn->dn_mtx); 32180a586ceaSMark Shellenbaum if (db->db_blkid > dn->dn_phys->dn_maxblkid && 32190a586ceaSMark Shellenbaum db->db_blkid != DMU_SPILL_BLKID) 3220fa9e4066Sahrens dn->dn_phys->dn_maxblkid = db->db_blkid; 3221fa9e4066Sahrens mutex_exit(&dn->dn_mtx); 3222fa9e4066Sahrens 3223fa9e4066Sahrens if (dn->dn_type == DMU_OT_DNODE) { 3224fa9e4066Sahrens dnode_phys_t *dnp = db->db.db_data; 3225fa9e4066Sahrens for (i = db->db.db_size >> DNODE_SHIFT; i > 0; 3226fa9e4066Sahrens i--, dnp++) { 3227fa9e4066Sahrens if (dnp->dn_type != DMU_OT_NONE) 3228fa9e4066Sahrens fill++; 3229fa9e4066Sahrens } 3230fa9e4066Sahrens } else { 323143466aaeSMax Grossman if (BP_IS_HOLE(bp)) { 323243466aaeSMax Grossman fill = 0; 323343466aaeSMax Grossman } else { 3234fa9e4066Sahrens fill = 1; 3235fa9e4066Sahrens } 323643466aaeSMax Grossman } 3237fa9e4066Sahrens } else { 3238e14bb325SJeff Bonwick blkptr_t *ibp = db->db.db_data; 3239fa9e4066Sahrens ASSERT3U(db->db.db_size, ==, 1<<dn->dn_phys->dn_indblkshift); 3240e14bb325SJeff Bonwick for (i = db->db.db_size >> SPA_BLKPTRSHIFT; i > 0; i--, ibp++) { 3241e14bb325SJeff Bonwick if (BP_IS_HOLE(ibp)) 3242fa9e4066Sahrens continue; 32435d7b4d43SMatthew Ahrens fill += BP_GET_FILL(ibp); 3244fa9e4066Sahrens } 3245fa9e4066Sahrens } 3246744947dcSTom Erickson DB_DNODE_EXIT(db); 3247fa9e4066Sahrens 32485d7b4d43SMatthew Ahrens if (!BP_IS_EMBEDDED(bp)) 3249e14bb325SJeff Bonwick bp->blk_fill = fill; 3250fa9e4066Sahrens 3251fa9e4066Sahrens mutex_exit(&db->db_mtx); 325211ceac77SAlex Reece 325311ceac77SAlex Reece rw_enter(&dn->dn_struct_rwlock, RW_WRITER); 325411ceac77SAlex Reece *db->db_blkptr = *bp; 325511ceac77SAlex Reece rw_exit(&dn->dn_struct_rwlock); 3256fa9e4066Sahrens } 3257fa9e4066Sahrens 32588df0bcf0SPaul Dagnelie /* ARGSUSED */ 32598df0bcf0SPaul Dagnelie /* 32608df0bcf0SPaul Dagnelie * This function gets called just prior to running through the compression 32618df0bcf0SPaul Dagnelie * stage of the zio pipeline. If we're an indirect block comprised of only 32628df0bcf0SPaul Dagnelie * holes, then we want this indirect to be compressed away to a hole. In 32638df0bcf0SPaul Dagnelie * order to do that we must zero out any information about the holes that 32648df0bcf0SPaul Dagnelie * this indirect points to prior to before we try to compress it. 32658df0bcf0SPaul Dagnelie */ 32668df0bcf0SPaul Dagnelie static void 32678df0bcf0SPaul Dagnelie dbuf_write_children_ready(zio_t *zio, arc_buf_t *buf, void *vdb) 32688df0bcf0SPaul Dagnelie { 32698df0bcf0SPaul Dagnelie dmu_buf_impl_t *db = vdb; 32708df0bcf0SPaul Dagnelie dnode_t *dn; 32718df0bcf0SPaul Dagnelie blkptr_t *bp; 32728df0bcf0SPaul Dagnelie uint64_t i; 32738df0bcf0SPaul Dagnelie int epbs; 32748df0bcf0SPaul Dagnelie 32758df0bcf0SPaul Dagnelie ASSERT3U(db->db_level, >, 0); 32768df0bcf0SPaul Dagnelie DB_DNODE_ENTER(db); 32778df0bcf0SPaul Dagnelie dn = DB_DNODE(db); 32788df0bcf0SPaul Dagnelie epbs = dn->dn_phys->dn_indblkshift - SPA_BLKPTRSHIFT; 32798df0bcf0SPaul Dagnelie 32808df0bcf0SPaul Dagnelie /* Determine if all our children are holes */ 32818df0bcf0SPaul Dagnelie for (i = 0, bp = db->db.db_data; i < 1 << epbs; i++, bp++) { 32828df0bcf0SPaul Dagnelie if (!BP_IS_HOLE(bp)) 32838df0bcf0SPaul Dagnelie break; 32848df0bcf0SPaul Dagnelie } 32858df0bcf0SPaul Dagnelie 32868df0bcf0SPaul Dagnelie /* 32878df0bcf0SPaul Dagnelie * If all the children are holes, then zero them all out so that 32888df0bcf0SPaul Dagnelie * we may get compressed away. 32898df0bcf0SPaul Dagnelie */ 32908df0bcf0SPaul Dagnelie if (i == 1 << epbs) { 32918df0bcf0SPaul Dagnelie /* didn't find any non-holes */ 32928df0bcf0SPaul Dagnelie bzero(db->db.db_data, db->db.db_size); 32938df0bcf0SPaul Dagnelie } 32948df0bcf0SPaul Dagnelie DB_DNODE_EXIT(db); 32958df0bcf0SPaul Dagnelie } 32968df0bcf0SPaul Dagnelie 329769962b56SMatthew Ahrens /* 329869962b56SMatthew Ahrens * The SPA will call this callback several times for each zio - once 329969962b56SMatthew Ahrens * for every physical child i/o (zio->io_phys_children times). This 330069962b56SMatthew Ahrens * allows the DMU to monitor the progress of each logical i/o. For example, 330169962b56SMatthew Ahrens * there may be 2 copies of an indirect block, or many fragments of a RAID-Z 330269962b56SMatthew Ahrens * block. There may be a long delay before all copies/fragments are completed, 330369962b56SMatthew Ahrens * so this callback allows us to retire dirty space gradually, as the physical 330469962b56SMatthew Ahrens * i/os complete. 330569962b56SMatthew Ahrens */ 330669962b56SMatthew Ahrens /* ARGSUSED */ 330769962b56SMatthew Ahrens static void 330869962b56SMatthew Ahrens dbuf_write_physdone(zio_t *zio, arc_buf_t *buf, void *arg) 330969962b56SMatthew Ahrens { 331069962b56SMatthew Ahrens dmu_buf_impl_t *db = arg; 331169962b56SMatthew Ahrens objset_t *os = db->db_objset; 331269962b56SMatthew Ahrens dsl_pool_t *dp = dmu_objset_pool(os); 331369962b56SMatthew Ahrens dbuf_dirty_record_t *dr; 331469962b56SMatthew Ahrens int delta = 0; 331569962b56SMatthew Ahrens 331669962b56SMatthew Ahrens dr = db->db_data_pending; 331769962b56SMatthew Ahrens ASSERT3U(dr->dr_txg, ==, zio->io_txg); 331869962b56SMatthew Ahrens 331969962b56SMatthew Ahrens /* 332069962b56SMatthew Ahrens * The callback will be called io_phys_children times. Retire one 332169962b56SMatthew Ahrens * portion of our dirty space each time we are called. Any rounding 332269962b56SMatthew Ahrens * error will be cleaned up by dsl_pool_sync()'s call to 332369962b56SMatthew Ahrens * dsl_pool_undirty_space(). 332469962b56SMatthew Ahrens */ 332569962b56SMatthew Ahrens delta = dr->dr_accounted / zio->io_phys_children; 332669962b56SMatthew Ahrens dsl_pool_undirty_space(dp, delta, zio->io_txg); 332769962b56SMatthew Ahrens } 332869962b56SMatthew Ahrens 3329c717a561Smaybee /* ARGSUSED */ 3330c717a561Smaybee static void 3331c717a561Smaybee dbuf_write_done(zio_t *zio, arc_buf_t *buf, void *vdb) 3332c717a561Smaybee { 3333c717a561Smaybee dmu_buf_impl_t *db = vdb; 3334b24ab676SJeff Bonwick blkptr_t *bp_orig = &zio->io_bp_orig; 333543466aaeSMax Grossman blkptr_t *bp = db->db_blkptr; 333643466aaeSMax Grossman objset_t *os = db->db_objset; 333743466aaeSMax Grossman dmu_tx_t *tx = os->os_synctx; 3338c717a561Smaybee dbuf_dirty_record_t **drp, *dr; 3339c717a561Smaybee 3340fb09f5aaSMadhav Suresh ASSERT0(zio->io_error); 3341b24ab676SJeff Bonwick ASSERT(db->db_blkptr == bp); 3342b24ab676SJeff Bonwick 334380901aeaSGeorge Wilson /* 334480901aeaSGeorge Wilson * For nopwrites and rewrites we ensure that the bp matches our 334580901aeaSGeorge Wilson * original and bypass all the accounting. 334680901aeaSGeorge Wilson */ 334780901aeaSGeorge Wilson if (zio->io_flags & (ZIO_FLAG_IO_REWRITE | ZIO_FLAG_NOPWRITE)) { 3348b24ab676SJeff Bonwick ASSERT(BP_EQUAL(bp, bp_orig)); 3349b24ab676SJeff Bonwick } else { 335043466aaeSMax Grossman dsl_dataset_t *ds = os->os_dsl_dataset; 3351b24ab676SJeff Bonwick (void) dsl_dataset_block_kill(ds, bp_orig, tx, B_TRUE); 3352b24ab676SJeff Bonwick dsl_dataset_block_born(ds, bp, tx); 3353b24ab676SJeff Bonwick } 3354c717a561Smaybee 3355c717a561Smaybee mutex_enter(&db->db_mtx); 3356c717a561Smaybee 3357b24ab676SJeff Bonwick DBUF_VERIFY(db); 3358b24ab676SJeff Bonwick 3359c717a561Smaybee drp = &db->db_last_dirty; 336017f17c2dSbonwick while ((dr = *drp) != db->db_data_pending) 336117f17c2dSbonwick drp = &dr->dr_next; 336217f17c2dSbonwick ASSERT(!list_link_active(&dr->dr_dirty_node)); 3363b24ab676SJeff Bonwick ASSERT(dr->dr_dbuf == db); 336417f17c2dSbonwick ASSERT(dr->dr_next == NULL); 336517f17c2dSbonwick *drp = dr->dr_next; 3366c717a561Smaybee 33670a586ceaSMark Shellenbaum #ifdef ZFS_DEBUG 33680a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) { 3369744947dcSTom Erickson dnode_t *dn; 3370744947dcSTom Erickson 3371744947dcSTom Erickson DB_DNODE_ENTER(db); 3372744947dcSTom Erickson dn = DB_DNODE(db); 33730a586ceaSMark Shellenbaum ASSERT(dn->dn_phys->dn_flags & DNODE_FLAG_SPILL_BLKPTR); 33740a586ceaSMark Shellenbaum ASSERT(!(BP_IS_HOLE(db->db_blkptr)) && 33750a586ceaSMark Shellenbaum db->db_blkptr == &dn->dn_phys->dn_spill); 3376744947dcSTom Erickson DB_DNODE_EXIT(db); 33770a586ceaSMark Shellenbaum } 33780a586ceaSMark Shellenbaum #endif 33790a586ceaSMark Shellenbaum 3380c717a561Smaybee if (db->db_level == 0) { 33810a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 3382c717a561Smaybee ASSERT(dr->dt.dl.dr_override_state == DR_NOT_OVERRIDDEN); 338382c9918fSTim Haley if (db->db_state != DB_NOFILL) { 3384c717a561Smaybee if (dr->dt.dl.dr_data != db->db_buf) 3385dcbf3bd6SGeorge Wilson arc_buf_destroy(dr->dt.dl.dr_data, db); 338682c9918fSTim Haley } 3387c717a561Smaybee } else { 3388744947dcSTom Erickson dnode_t *dn; 3389744947dcSTom Erickson 3390744947dcSTom Erickson DB_DNODE_ENTER(db); 3391744947dcSTom Erickson dn = DB_DNODE(db); 3392c717a561Smaybee ASSERT(list_head(&dr->dt.di.dr_children) == NULL); 3393c717a561Smaybee ASSERT3U(db->db.db_size, ==, 1 << dn->dn_phys->dn_indblkshift); 3394c717a561Smaybee if (!BP_IS_HOLE(db->db_blkptr)) { 3395c717a561Smaybee int epbs = 3396c717a561Smaybee dn->dn_phys->dn_indblkshift - SPA_BLKPTRSHIFT; 339743466aaeSMax Grossman ASSERT3U(db->db_blkid, <=, 339843466aaeSMax Grossman dn->dn_phys->dn_maxblkid >> (db->db_level * epbs)); 3399c717a561Smaybee ASSERT3U(BP_GET_LSIZE(db->db_blkptr), ==, 3400c717a561Smaybee db->db.db_size); 3401c717a561Smaybee } 3402744947dcSTom Erickson DB_DNODE_EXIT(db); 3403c25056deSgw25295 mutex_destroy(&dr->dt.di.dr_mtx); 3404c25056deSgw25295 list_destroy(&dr->dt.di.dr_children); 3405c717a561Smaybee } 3406c717a561Smaybee kmem_free(dr, sizeof (dbuf_dirty_record_t)); 3407c717a561Smaybee 3408c717a561Smaybee cv_broadcast(&db->db_changed); 3409c717a561Smaybee ASSERT(db->db_dirtycnt > 0); 3410c717a561Smaybee db->db_dirtycnt -= 1; 3411c717a561Smaybee db->db_data_pending = NULL; 341243466aaeSMax Grossman dbuf_rele_and_unlock(db, (void *)(uintptr_t)tx->tx_txg); 3413b24ab676SJeff Bonwick } 3414b24ab676SJeff Bonwick 3415b24ab676SJeff Bonwick static void 3416b24ab676SJeff Bonwick dbuf_write_nofill_ready(zio_t *zio) 3417b24ab676SJeff Bonwick { 3418b24ab676SJeff Bonwick dbuf_write_ready(zio, NULL, zio->io_private); 3419b24ab676SJeff Bonwick } 3420b24ab676SJeff Bonwick 3421b24ab676SJeff Bonwick static void 3422b24ab676SJeff Bonwick dbuf_write_nofill_done(zio_t *zio) 3423b24ab676SJeff Bonwick { 3424b24ab676SJeff Bonwick dbuf_write_done(zio, NULL, zio->io_private); 3425b24ab676SJeff Bonwick } 3426b24ab676SJeff Bonwick 3427b24ab676SJeff Bonwick static void 3428b24ab676SJeff Bonwick dbuf_write_override_ready(zio_t *zio) 3429b24ab676SJeff Bonwick { 3430b24ab676SJeff Bonwick dbuf_dirty_record_t *dr = zio->io_private; 3431b24ab676SJeff Bonwick dmu_buf_impl_t *db = dr->dr_dbuf; 3432b24ab676SJeff Bonwick 3433b24ab676SJeff Bonwick dbuf_write_ready(zio, NULL, db); 3434b24ab676SJeff Bonwick } 3435b24ab676SJeff Bonwick 3436b24ab676SJeff Bonwick static void 3437b24ab676SJeff Bonwick dbuf_write_override_done(zio_t *zio) 3438b24ab676SJeff Bonwick { 3439b24ab676SJeff Bonwick dbuf_dirty_record_t *dr = zio->io_private; 3440b24ab676SJeff Bonwick dmu_buf_impl_t *db = dr->dr_dbuf; 3441b24ab676SJeff Bonwick blkptr_t *obp = &dr->dt.dl.dr_overridden_by; 3442b24ab676SJeff Bonwick 3443b24ab676SJeff Bonwick mutex_enter(&db->db_mtx); 3444b24ab676SJeff Bonwick if (!BP_EQUAL(zio->io_bp, obp)) { 3445b24ab676SJeff Bonwick if (!BP_IS_HOLE(obp)) 3446b24ab676SJeff Bonwick dsl_free(spa_get_dsl(zio->io_spa), zio->io_txg, obp); 3447b24ab676SJeff Bonwick arc_release(dr->dt.dl.dr_data, db); 3448b24ab676SJeff Bonwick } 3449c717a561Smaybee mutex_exit(&db->db_mtx); 3450c717a561Smaybee 3451b24ab676SJeff Bonwick dbuf_write_done(zio, NULL, db); 3452b24ab676SJeff Bonwick } 3453c717a561Smaybee 34543e30c24aSWill Andrews /* Issue I/O to commit a dirty buffer to disk. */ 3455b24ab676SJeff Bonwick static void 3456b24ab676SJeff Bonwick dbuf_write(dbuf_dirty_record_t *dr, arc_buf_t *data, dmu_tx_t *tx) 3457b24ab676SJeff Bonwick { 3458b24ab676SJeff Bonwick dmu_buf_impl_t *db = dr->dr_dbuf; 3459744947dcSTom Erickson dnode_t *dn; 3460744947dcSTom Erickson objset_t *os; 3461b24ab676SJeff Bonwick dmu_buf_impl_t *parent = db->db_parent; 3462b24ab676SJeff Bonwick uint64_t txg = tx->tx_txg; 34637802d7bfSMatthew Ahrens zbookmark_phys_t zb; 3464b24ab676SJeff Bonwick zio_prop_t zp; 3465b24ab676SJeff Bonwick zio_t *zio; 34660a586ceaSMark Shellenbaum int wp_flag = 0; 3467b24ab676SJeff Bonwick 346811ceac77SAlex Reece ASSERT(dmu_tx_is_syncing(tx)); 346911ceac77SAlex Reece 3470744947dcSTom Erickson DB_DNODE_ENTER(db); 3471744947dcSTom Erickson dn = DB_DNODE(db); 3472744947dcSTom Erickson os = dn->dn_objset; 3473744947dcSTom Erickson 3474b24ab676SJeff Bonwick if (db->db_state != DB_NOFILL) { 3475b24ab676SJeff Bonwick if (db->db_level > 0 || dn->dn_type == DMU_OT_DNODE) { 3476b24ab676SJeff Bonwick /* 3477b24ab676SJeff Bonwick * Private object buffers are released here rather 3478b24ab676SJeff Bonwick * than in dbuf_dirty() since they are only modified 3479b24ab676SJeff Bonwick * in the syncing context and we don't want the 3480b24ab676SJeff Bonwick * overhead of making multiple copies of the data. 3481b24ab676SJeff Bonwick */ 3482b24ab676SJeff Bonwick if (BP_IS_HOLE(db->db_blkptr)) { 3483b24ab676SJeff Bonwick arc_buf_thaw(data); 3484b24ab676SJeff Bonwick } else { 34853f9d6ad7SLin Ling dbuf_release_bp(db); 3486b24ab676SJeff Bonwick } 3487b24ab676SJeff Bonwick } 3488b24ab676SJeff Bonwick } 3489b24ab676SJeff Bonwick 3490b24ab676SJeff Bonwick if (parent != dn->dn_dbuf) { 34913e30c24aSWill Andrews /* Our parent is an indirect block. */ 34923e30c24aSWill Andrews /* We have a dirty parent that has been scheduled for write. */ 3493b24ab676SJeff Bonwick ASSERT(parent && parent->db_data_pending); 34943e30c24aSWill Andrews /* Our parent's buffer is one level closer to the dnode. */ 3495b24ab676SJeff Bonwick ASSERT(db->db_level == parent->db_level-1); 34963e30c24aSWill Andrews /* 34973e30c24aSWill Andrews * We're about to modify our parent's db_data by modifying 34983e30c24aSWill Andrews * our block pointer, so the parent must be released. 34993e30c24aSWill Andrews */ 3500b24ab676SJeff Bonwick ASSERT(arc_released(parent->db_buf)); 3501b24ab676SJeff Bonwick zio = parent->db_data_pending->dr_zio; 3502b24ab676SJeff Bonwick } else { 35033e30c24aSWill Andrews /* Our parent is the dnode itself. */ 35040a586ceaSMark Shellenbaum ASSERT((db->db_level == dn->dn_phys->dn_nlevels-1 && 35050a586ceaSMark Shellenbaum db->db_blkid != DMU_SPILL_BLKID) || 35060a586ceaSMark Shellenbaum (db->db_blkid == DMU_SPILL_BLKID && db->db_level == 0)); 35070a586ceaSMark Shellenbaum if (db->db_blkid != DMU_SPILL_BLKID) 3508b24ab676SJeff Bonwick ASSERT3P(db->db_blkptr, ==, 3509b24ab676SJeff Bonwick &dn->dn_phys->dn_blkptr[db->db_blkid]); 3510b24ab676SJeff Bonwick zio = dn->dn_zio; 3511b24ab676SJeff Bonwick } 3512b24ab676SJeff Bonwick 3513b24ab676SJeff Bonwick ASSERT(db->db_level == 0 || data == db->db_buf); 3514b24ab676SJeff Bonwick ASSERT3U(db->db_blkptr->blk_birth, <=, txg); 3515b24ab676SJeff Bonwick ASSERT(zio); 3516b24ab676SJeff Bonwick 3517b24ab676SJeff Bonwick SET_BOOKMARK(&zb, os->os_dsl_dataset ? 3518b24ab676SJeff Bonwick os->os_dsl_dataset->ds_object : DMU_META_OBJSET, 3519b24ab676SJeff Bonwick db->db.db_object, db->db_level, db->db_blkid); 3520b24ab676SJeff Bonwick 35210a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) 35220a586ceaSMark Shellenbaum wp_flag = WP_SPILL; 35230a586ceaSMark Shellenbaum wp_flag |= (db->db_state == DB_NOFILL) ? WP_NOFILL : 0; 35240a586ceaSMark Shellenbaum 35250a586ceaSMark Shellenbaum dmu_write_policy(os, dn, db->db_level, wp_flag, &zp); 3526744947dcSTom Erickson DB_DNODE_EXIT(db); 3527b24ab676SJeff Bonwick 352811ceac77SAlex Reece /* 352911ceac77SAlex Reece * We copy the blkptr now (rather than when we instantiate the dirty 353011ceac77SAlex Reece * record), because its value can change between open context and 353111ceac77SAlex Reece * syncing context. We do not need to hold dn_struct_rwlock to read 353211ceac77SAlex Reece * db_blkptr because we are in syncing context. 353311ceac77SAlex Reece */ 353411ceac77SAlex Reece dr->dr_bp_copy = *db->db_blkptr; 353511ceac77SAlex Reece 35365d7b4d43SMatthew Ahrens if (db->db_level == 0 && 35375d7b4d43SMatthew Ahrens dr->dt.dl.dr_override_state == DR_OVERRIDDEN) { 35385d7b4d43SMatthew Ahrens /* 35395d7b4d43SMatthew Ahrens * The BP for this block has been provided by open context 35405d7b4d43SMatthew Ahrens * (by dmu_sync() or dmu_buf_write_embedded()). 35415d7b4d43SMatthew Ahrens */ 35425d7b4d43SMatthew Ahrens void *contents = (data != NULL) ? data->b_data : NULL; 35435d7b4d43SMatthew Ahrens 3544b24ab676SJeff Bonwick dr->dr_zio = zio_write(zio, os->os_spa, txg, 354511ceac77SAlex Reece &dr->dr_bp_copy, contents, db->db.db_size, &zp, 35468df0bcf0SPaul Dagnelie dbuf_write_override_ready, NULL, NULL, 35478df0bcf0SPaul Dagnelie dbuf_write_override_done, 354869962b56SMatthew Ahrens dr, ZIO_PRIORITY_ASYNC_WRITE, ZIO_FLAG_MUSTSUCCEED, &zb); 3549b24ab676SJeff Bonwick mutex_enter(&db->db_mtx); 3550b24ab676SJeff Bonwick dr->dt.dl.dr_override_state = DR_NOT_OVERRIDDEN; 3551b24ab676SJeff Bonwick zio_write_override(dr->dr_zio, &dr->dt.dl.dr_overridden_by, 355280901aeaSGeorge Wilson dr->dt.dl.dr_copies, dr->dt.dl.dr_nopwrite); 3553b24ab676SJeff Bonwick mutex_exit(&db->db_mtx); 3554b24ab676SJeff Bonwick } else if (db->db_state == DB_NOFILL) { 3555810e43b2SBill Pijewski ASSERT(zp.zp_checksum == ZIO_CHECKSUM_OFF || 3556810e43b2SBill Pijewski zp.zp_checksum == ZIO_CHECKSUM_NOPARITY); 3557b24ab676SJeff Bonwick dr->dr_zio = zio_write(zio, os->os_spa, txg, 355811ceac77SAlex Reece &dr->dr_bp_copy, NULL, db->db.db_size, &zp, 35598df0bcf0SPaul Dagnelie dbuf_write_nofill_ready, NULL, NULL, 35608df0bcf0SPaul Dagnelie dbuf_write_nofill_done, db, 3561b24ab676SJeff Bonwick ZIO_PRIORITY_ASYNC_WRITE, 3562b24ab676SJeff Bonwick ZIO_FLAG_MUSTSUCCEED | ZIO_FLAG_NODATA, &zb); 3563b24ab676SJeff Bonwick } else { 3564b24ab676SJeff Bonwick ASSERT(arc_released(data)); 35658df0bcf0SPaul Dagnelie 35668df0bcf0SPaul Dagnelie /* 35678df0bcf0SPaul Dagnelie * For indirect blocks, we want to setup the children 35688df0bcf0SPaul Dagnelie * ready callback so that we can properly handle an indirect 35698df0bcf0SPaul Dagnelie * block that only contains holes. 35708df0bcf0SPaul Dagnelie */ 35718df0bcf0SPaul Dagnelie arc_done_func_t *children_ready_cb = NULL; 35728df0bcf0SPaul Dagnelie if (db->db_level != 0) 35738df0bcf0SPaul Dagnelie children_ready_cb = dbuf_write_children_ready; 35748df0bcf0SPaul Dagnelie 3575b24ab676SJeff Bonwick dr->dr_zio = arc_write(zio, os->os_spa, txg, 357611ceac77SAlex Reece &dr->dr_bp_copy, data, DBUF_IS_L2CACHEABLE(db), 3577dcbf3bd6SGeorge Wilson &zp, dbuf_write_ready, children_ready_cb, 357869962b56SMatthew Ahrens dbuf_write_physdone, dbuf_write_done, db, 357969962b56SMatthew Ahrens ZIO_PRIORITY_ASYNC_WRITE, ZIO_FLAG_MUSTSUCCEED, &zb); 3580b24ab676SJeff Bonwick } 3581fa9e4066Sahrens } 3582