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, 5740510e8eSJosef 'Jeff' Sipek dmu_buf_evict_func_t *evict_func_sync, 5840510e8eSJosef 'Jeff' Sipek dmu_buf_evict_func_t *evict_func_async, 5940510e8eSJosef 'Jeff' Sipek dmu_buf_t **clear_on_evict_dbufp); 60bc9014e6SJustin Gibbs #endif /* ! __lint */ 61bc9014e6SJustin Gibbs 62fa9e4066Sahrens /* 63fa9e4066Sahrens * Global data structures and functions for the dbuf cache. 64fa9e4066Sahrens */ 65dcbf3bd6SGeorge Wilson static kmem_cache_t *dbuf_kmem_cache; 66bc9014e6SJustin Gibbs static taskq_t *dbu_evict_taskq; 67fa9e4066Sahrens 68dcbf3bd6SGeorge Wilson static kthread_t *dbuf_cache_evict_thread; 69dcbf3bd6SGeorge Wilson static kmutex_t dbuf_evict_lock; 70dcbf3bd6SGeorge Wilson static kcondvar_t dbuf_evict_cv; 71dcbf3bd6SGeorge Wilson static boolean_t dbuf_evict_thread_exit; 72dcbf3bd6SGeorge Wilson 73dcbf3bd6SGeorge Wilson /* 74dcbf3bd6SGeorge Wilson * LRU cache of dbufs. The dbuf cache maintains a list of dbufs that 75dcbf3bd6SGeorge Wilson * are not currently held but have been recently released. These dbufs 76dcbf3bd6SGeorge Wilson * are not eligible for arc eviction until they are aged out of the cache. 77dcbf3bd6SGeorge Wilson * Dbufs are added to the dbuf cache once the last hold is released. If a 78dcbf3bd6SGeorge Wilson * dbuf is later accessed and still exists in the dbuf cache, then it will 79dcbf3bd6SGeorge Wilson * be removed from the cache and later re-added to the head of the cache. 80dcbf3bd6SGeorge Wilson * Dbufs that are aged out of the cache will be immediately destroyed and 81dcbf3bd6SGeorge Wilson * become eligible for arc eviction. 82dcbf3bd6SGeorge Wilson */ 83dcbf3bd6SGeorge Wilson static multilist_t dbuf_cache; 84dcbf3bd6SGeorge Wilson static refcount_t dbuf_cache_size; 85dcbf3bd6SGeorge Wilson uint64_t dbuf_cache_max_bytes = 100 * 1024 * 1024; 86dcbf3bd6SGeorge Wilson 87dcbf3bd6SGeorge Wilson /* Cap the size of the dbuf cache to log2 fraction of arc size. */ 88dcbf3bd6SGeorge Wilson int dbuf_cache_max_shift = 5; 89dcbf3bd6SGeorge Wilson 90dcbf3bd6SGeorge Wilson /* 91dcbf3bd6SGeorge Wilson * The dbuf cache uses a three-stage eviction policy: 92dcbf3bd6SGeorge Wilson * - A low water marker designates when the dbuf eviction thread 93dcbf3bd6SGeorge Wilson * should stop evicting from the dbuf cache. 94dcbf3bd6SGeorge Wilson * - When we reach the maximum size (aka mid water mark), we 95dcbf3bd6SGeorge Wilson * signal the eviction thread to run. 96dcbf3bd6SGeorge Wilson * - The high water mark indicates when the eviction thread 97dcbf3bd6SGeorge Wilson * is unable to keep up with the incoming load and eviction must 98dcbf3bd6SGeorge Wilson * happen in the context of the calling thread. 99dcbf3bd6SGeorge Wilson * 100dcbf3bd6SGeorge Wilson * The dbuf cache: 101dcbf3bd6SGeorge Wilson * (max size) 102dcbf3bd6SGeorge Wilson * low water mid water hi water 103dcbf3bd6SGeorge Wilson * +----------------------------------------+----------+----------+ 104dcbf3bd6SGeorge Wilson * | | | | 105dcbf3bd6SGeorge Wilson * | | | | 106dcbf3bd6SGeorge Wilson * | | | | 107dcbf3bd6SGeorge Wilson * | | | | 108dcbf3bd6SGeorge Wilson * +----------------------------------------+----------+----------+ 109dcbf3bd6SGeorge Wilson * stop signal evict 110dcbf3bd6SGeorge Wilson * evicting eviction directly 111dcbf3bd6SGeorge Wilson * thread 112dcbf3bd6SGeorge Wilson * 113dcbf3bd6SGeorge Wilson * The high and low water marks indicate the operating range for the eviction 114dcbf3bd6SGeorge Wilson * thread. The low water mark is, by default, 90% of the total size of the 115dcbf3bd6SGeorge Wilson * cache and the high water mark is at 110% (both of these percentages can be 116dcbf3bd6SGeorge Wilson * changed by setting dbuf_cache_lowater_pct and dbuf_cache_hiwater_pct, 117dcbf3bd6SGeorge Wilson * respectively). The eviction thread will try to ensure that the cache remains 118dcbf3bd6SGeorge Wilson * within this range by waking up every second and checking if the cache is 119dcbf3bd6SGeorge Wilson * above the low water mark. The thread can also be woken up by callers adding 120dcbf3bd6SGeorge Wilson * elements into the cache if the cache is larger than the mid water (i.e max 121dcbf3bd6SGeorge Wilson * cache size). Once the eviction thread is woken up and eviction is required, 122dcbf3bd6SGeorge Wilson * it will continue evicting buffers until it's able to reduce the cache size 123dcbf3bd6SGeorge Wilson * to the low water mark. If the cache size continues to grow and hits the high 124dcbf3bd6SGeorge Wilson * water mark, then callers adding elments to the cache will begin to evict 125dcbf3bd6SGeorge Wilson * directly from the cache until the cache is no longer above the high water 126dcbf3bd6SGeorge Wilson * mark. 127dcbf3bd6SGeorge Wilson */ 128dcbf3bd6SGeorge Wilson 129dcbf3bd6SGeorge Wilson /* 130dcbf3bd6SGeorge Wilson * The percentage above and below the maximum cache size. 131dcbf3bd6SGeorge Wilson */ 132dcbf3bd6SGeorge Wilson uint_t dbuf_cache_hiwater_pct = 10; 133dcbf3bd6SGeorge Wilson uint_t dbuf_cache_lowater_pct = 10; 134dcbf3bd6SGeorge Wilson 135fa9e4066Sahrens /* ARGSUSED */ 136fa9e4066Sahrens static int 137fa9e4066Sahrens dbuf_cons(void *vdb, void *unused, int kmflag) 138fa9e4066Sahrens { 139fa9e4066Sahrens dmu_buf_impl_t *db = vdb; 140fa9e4066Sahrens bzero(db, sizeof (dmu_buf_impl_t)); 141fa9e4066Sahrens 142fa9e4066Sahrens mutex_init(&db->db_mtx, NULL, MUTEX_DEFAULT, NULL); 143fa9e4066Sahrens cv_init(&db->db_changed, NULL, CV_DEFAULT, NULL); 144dcbf3bd6SGeorge Wilson multilist_link_init(&db->db_cache_link); 145fa9e4066Sahrens refcount_create(&db->db_holds); 1460f6d88adSAlex Reece 147fa9e4066Sahrens return (0); 148fa9e4066Sahrens } 149fa9e4066Sahrens 150fa9e4066Sahrens /* ARGSUSED */ 151fa9e4066Sahrens static void 152fa9e4066Sahrens dbuf_dest(void *vdb, void *unused) 153fa9e4066Sahrens { 154fa9e4066Sahrens dmu_buf_impl_t *db = vdb; 155fa9e4066Sahrens mutex_destroy(&db->db_mtx); 156fa9e4066Sahrens cv_destroy(&db->db_changed); 157dcbf3bd6SGeorge Wilson ASSERT(!multilist_link_active(&db->db_cache_link)); 158fa9e4066Sahrens refcount_destroy(&db->db_holds); 159fa9e4066Sahrens } 160fa9e4066Sahrens 161fa9e4066Sahrens /* 162fa9e4066Sahrens * dbuf hash table routines 163fa9e4066Sahrens */ 164fa9e4066Sahrens static dbuf_hash_table_t dbuf_hash_table; 165fa9e4066Sahrens 166fa9e4066Sahrens static uint64_t dbuf_hash_count; 167fa9e4066Sahrens 168fa9e4066Sahrens static uint64_t 169fa9e4066Sahrens dbuf_hash(void *os, uint64_t obj, uint8_t lvl, uint64_t blkid) 170fa9e4066Sahrens { 171fa9e4066Sahrens uintptr_t osv = (uintptr_t)os; 172fa9e4066Sahrens uint64_t crc = -1ULL; 173fa9e4066Sahrens 174fa9e4066Sahrens ASSERT(zfs_crc64_table[128] == ZFS_CRC64_POLY); 175fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (lvl)) & 0xFF]; 176fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (osv >> 6)) & 0xFF]; 177fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (obj >> 0)) & 0xFF]; 178fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (obj >> 8)) & 0xFF]; 179fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (blkid >> 0)) & 0xFF]; 180fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (blkid >> 8)) & 0xFF]; 181fa9e4066Sahrens 182fa9e4066Sahrens crc ^= (osv>>14) ^ (obj>>16) ^ (blkid>>16); 183fa9e4066Sahrens 184fa9e4066Sahrens return (crc); 185fa9e4066Sahrens } 186fa9e4066Sahrens 187fa9e4066Sahrens #define DBUF_EQUAL(dbuf, os, obj, level, blkid) \ 188fa9e4066Sahrens ((dbuf)->db.db_object == (obj) && \ 189fa9e4066Sahrens (dbuf)->db_objset == (os) && \ 190fa9e4066Sahrens (dbuf)->db_level == (level) && \ 191fa9e4066Sahrens (dbuf)->db_blkid == (blkid)) 192fa9e4066Sahrens 193fa9e4066Sahrens dmu_buf_impl_t * 194e57a022bSJustin T. Gibbs dbuf_find(objset_t *os, uint64_t obj, uint8_t level, uint64_t blkid) 195fa9e4066Sahrens { 196fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 197dcbf3bd6SGeorge Wilson uint64_t hv = dbuf_hash(os, obj, level, blkid); 198fa9e4066Sahrens uint64_t idx = hv & h->hash_table_mask; 199fa9e4066Sahrens dmu_buf_impl_t *db; 200fa9e4066Sahrens 201fa9e4066Sahrens mutex_enter(DBUF_HASH_MUTEX(h, idx)); 202fa9e4066Sahrens for (db = h->hash_table[idx]; db != NULL; db = db->db_hash_next) { 203fa9e4066Sahrens if (DBUF_EQUAL(db, os, obj, level, blkid)) { 204fa9e4066Sahrens mutex_enter(&db->db_mtx); 205ea8dc4b6Seschrock if (db->db_state != DB_EVICTING) { 206fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 207fa9e4066Sahrens return (db); 208fa9e4066Sahrens } 209fa9e4066Sahrens mutex_exit(&db->db_mtx); 210fa9e4066Sahrens } 211fa9e4066Sahrens } 212fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 213fa9e4066Sahrens return (NULL); 214fa9e4066Sahrens } 215fa9e4066Sahrens 216e57a022bSJustin T. Gibbs static dmu_buf_impl_t * 217e57a022bSJustin T. Gibbs dbuf_find_bonus(objset_t *os, uint64_t object) 218e57a022bSJustin T. Gibbs { 219e57a022bSJustin T. Gibbs dnode_t *dn; 220e57a022bSJustin T. Gibbs dmu_buf_impl_t *db = NULL; 221e57a022bSJustin T. Gibbs 222e57a022bSJustin T. Gibbs if (dnode_hold(os, object, FTAG, &dn) == 0) { 223e57a022bSJustin T. Gibbs rw_enter(&dn->dn_struct_rwlock, RW_READER); 224e57a022bSJustin T. Gibbs if (dn->dn_bonus != NULL) { 225e57a022bSJustin T. Gibbs db = dn->dn_bonus; 226e57a022bSJustin T. Gibbs mutex_enter(&db->db_mtx); 227e57a022bSJustin T. Gibbs } 228e57a022bSJustin T. Gibbs rw_exit(&dn->dn_struct_rwlock); 229e57a022bSJustin T. Gibbs dnode_rele(dn, FTAG); 230e57a022bSJustin T. Gibbs } 231e57a022bSJustin T. Gibbs return (db); 232e57a022bSJustin T. Gibbs } 233e57a022bSJustin T. Gibbs 234fa9e4066Sahrens /* 235fa9e4066Sahrens * Insert an entry into the hash table. If there is already an element 236fa9e4066Sahrens * equal to elem in the hash table, then the already existing element 237fa9e4066Sahrens * will be returned and the new element will not be inserted. 238fa9e4066Sahrens * Otherwise returns NULL. 239fa9e4066Sahrens */ 240fa9e4066Sahrens static dmu_buf_impl_t * 241fa9e4066Sahrens dbuf_hash_insert(dmu_buf_impl_t *db) 242fa9e4066Sahrens { 243fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 244503ad85cSMatthew Ahrens objset_t *os = db->db_objset; 245fa9e4066Sahrens uint64_t obj = db->db.db_object; 246fa9e4066Sahrens int level = db->db_level; 247fa9e4066Sahrens uint64_t blkid = db->db_blkid; 248dcbf3bd6SGeorge Wilson uint64_t hv = dbuf_hash(os, obj, level, blkid); 249fa9e4066Sahrens uint64_t idx = hv & h->hash_table_mask; 250fa9e4066Sahrens dmu_buf_impl_t *dbf; 251fa9e4066Sahrens 252fa9e4066Sahrens mutex_enter(DBUF_HASH_MUTEX(h, idx)); 253fa9e4066Sahrens for (dbf = h->hash_table[idx]; dbf != NULL; dbf = dbf->db_hash_next) { 254fa9e4066Sahrens if (DBUF_EQUAL(dbf, os, obj, level, blkid)) { 255fa9e4066Sahrens mutex_enter(&dbf->db_mtx); 256ea8dc4b6Seschrock if (dbf->db_state != DB_EVICTING) { 257fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 258fa9e4066Sahrens return (dbf); 259fa9e4066Sahrens } 260fa9e4066Sahrens mutex_exit(&dbf->db_mtx); 261fa9e4066Sahrens } 262fa9e4066Sahrens } 263fa9e4066Sahrens 264fa9e4066Sahrens mutex_enter(&db->db_mtx); 265fa9e4066Sahrens db->db_hash_next = h->hash_table[idx]; 266fa9e4066Sahrens h->hash_table[idx] = db; 267fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 2681a5e258fSJosef 'Jeff' Sipek atomic_inc_64(&dbuf_hash_count); 269fa9e4066Sahrens 270fa9e4066Sahrens return (NULL); 271fa9e4066Sahrens } 272fa9e4066Sahrens 273fa9e4066Sahrens /* 274bbfa8ea8SMatthew Ahrens * Remove an entry from the hash table. It must be in the EVICTING state. 275fa9e4066Sahrens */ 276fa9e4066Sahrens static void 277fa9e4066Sahrens dbuf_hash_remove(dmu_buf_impl_t *db) 278fa9e4066Sahrens { 279fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 280dcbf3bd6SGeorge Wilson uint64_t hv = dbuf_hash(db->db_objset, db->db.db_object, 281fa9e4066Sahrens db->db_level, db->db_blkid); 282fa9e4066Sahrens uint64_t idx = hv & h->hash_table_mask; 283fa9e4066Sahrens dmu_buf_impl_t *dbf, **dbp; 284fa9e4066Sahrens 285fa9e4066Sahrens /* 286bbfa8ea8SMatthew Ahrens * We musn't hold db_mtx to maintain lock ordering: 287fa9e4066Sahrens * DBUF_HASH_MUTEX > db_mtx. 288fa9e4066Sahrens */ 289fa9e4066Sahrens ASSERT(refcount_is_zero(&db->db_holds)); 290ea8dc4b6Seschrock ASSERT(db->db_state == DB_EVICTING); 291fa9e4066Sahrens ASSERT(!MUTEX_HELD(&db->db_mtx)); 292fa9e4066Sahrens 293fa9e4066Sahrens mutex_enter(DBUF_HASH_MUTEX(h, idx)); 294fa9e4066Sahrens dbp = &h->hash_table[idx]; 295fa9e4066Sahrens while ((dbf = *dbp) != db) { 296fa9e4066Sahrens dbp = &dbf->db_hash_next; 297fa9e4066Sahrens ASSERT(dbf != NULL); 298fa9e4066Sahrens } 299fa9e4066Sahrens *dbp = db->db_hash_next; 300fa9e4066Sahrens db->db_hash_next = NULL; 301fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 3021a5e258fSJosef 'Jeff' Sipek atomic_dec_64(&dbuf_hash_count); 303fa9e4066Sahrens } 304fa9e4066Sahrens 305bc9014e6SJustin Gibbs typedef enum { 306bc9014e6SJustin Gibbs DBVU_EVICTING, 307bc9014e6SJustin Gibbs DBVU_NOT_EVICTING 308bc9014e6SJustin Gibbs } dbvu_verify_type_t; 309bc9014e6SJustin Gibbs 310bc9014e6SJustin Gibbs static void 311bc9014e6SJustin Gibbs dbuf_verify_user(dmu_buf_impl_t *db, dbvu_verify_type_t verify_type) 312bc9014e6SJustin Gibbs { 313bc9014e6SJustin Gibbs #ifdef ZFS_DEBUG 314bc9014e6SJustin Gibbs int64_t holds; 315bc9014e6SJustin Gibbs 316bc9014e6SJustin Gibbs if (db->db_user == NULL) 317bc9014e6SJustin Gibbs return; 318bc9014e6SJustin Gibbs 319bc9014e6SJustin Gibbs /* Only data blocks support the attachment of user data. */ 320bc9014e6SJustin Gibbs ASSERT(db->db_level == 0); 321bc9014e6SJustin Gibbs 322bc9014e6SJustin Gibbs /* Clients must resolve a dbuf before attaching user data. */ 323bc9014e6SJustin Gibbs ASSERT(db->db.db_data != NULL); 324bc9014e6SJustin Gibbs ASSERT3U(db->db_state, ==, DB_CACHED); 325bc9014e6SJustin Gibbs 326bc9014e6SJustin Gibbs holds = refcount_count(&db->db_holds); 327bc9014e6SJustin Gibbs if (verify_type == DBVU_EVICTING) { 328bc9014e6SJustin Gibbs /* 329bc9014e6SJustin Gibbs * Immediate eviction occurs when holds == dirtycnt. 330bc9014e6SJustin Gibbs * For normal eviction buffers, holds is zero on 331bc9014e6SJustin Gibbs * eviction, except when dbuf_fix_old_data() calls 332bc9014e6SJustin Gibbs * dbuf_clear_data(). However, the hold count can grow 333bc9014e6SJustin Gibbs * during eviction even though db_mtx is held (see 334bc9014e6SJustin Gibbs * dmu_bonus_hold() for an example), so we can only 335bc9014e6SJustin Gibbs * test the generic invariant that holds >= dirtycnt. 336bc9014e6SJustin Gibbs */ 337bc9014e6SJustin Gibbs ASSERT3U(holds, >=, db->db_dirtycnt); 338bc9014e6SJustin Gibbs } else { 339d2058105SJustin T. Gibbs if (db->db_user_immediate_evict == TRUE) 340bc9014e6SJustin Gibbs ASSERT3U(holds, >=, db->db_dirtycnt); 341bc9014e6SJustin Gibbs else 342bc9014e6SJustin Gibbs ASSERT3U(holds, >, 0); 343bc9014e6SJustin Gibbs } 344bc9014e6SJustin Gibbs #endif 345bc9014e6SJustin Gibbs } 346bc9014e6SJustin Gibbs 347fa9e4066Sahrens static void 348fa9e4066Sahrens dbuf_evict_user(dmu_buf_impl_t *db) 349fa9e4066Sahrens { 350bc9014e6SJustin Gibbs dmu_buf_user_t *dbu = db->db_user; 351bc9014e6SJustin Gibbs 352fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 353fa9e4066Sahrens 354bc9014e6SJustin Gibbs if (dbu == NULL) 355fa9e4066Sahrens return; 356fa9e4066Sahrens 357bc9014e6SJustin Gibbs dbuf_verify_user(db, DBVU_EVICTING); 358bc9014e6SJustin Gibbs db->db_user = NULL; 359bc9014e6SJustin Gibbs 360bc9014e6SJustin Gibbs #ifdef ZFS_DEBUG 361bc9014e6SJustin Gibbs if (dbu->dbu_clear_on_evict_dbufp != NULL) 362bc9014e6SJustin Gibbs *dbu->dbu_clear_on_evict_dbufp = NULL; 363bc9014e6SJustin Gibbs #endif 364bc9014e6SJustin Gibbs 365bc9014e6SJustin Gibbs /* 36640510e8eSJosef 'Jeff' Sipek * There are two eviction callbacks - one that we call synchronously 36740510e8eSJosef 'Jeff' Sipek * and one that we invoke via a taskq. The async one is useful for 36840510e8eSJosef 'Jeff' Sipek * avoiding lock order reversals and limiting stack depth. 36940510e8eSJosef 'Jeff' Sipek * 37040510e8eSJosef 'Jeff' Sipek * Note that if we have a sync callback but no async callback, 37140510e8eSJosef 'Jeff' Sipek * it's likely that the sync callback will free the structure 37240510e8eSJosef 'Jeff' Sipek * containing the dbu. In that case we need to take care to not 37340510e8eSJosef 'Jeff' Sipek * dereference dbu after calling the sync evict func. 374bc9014e6SJustin Gibbs */ 37540510e8eSJosef 'Jeff' Sipek boolean_t has_async = (dbu->dbu_evict_func_async != NULL); 37640510e8eSJosef 'Jeff' Sipek 37740510e8eSJosef 'Jeff' Sipek if (dbu->dbu_evict_func_sync != NULL) 37840510e8eSJosef 'Jeff' Sipek dbu->dbu_evict_func_sync(dbu); 37940510e8eSJosef 'Jeff' Sipek 38040510e8eSJosef 'Jeff' Sipek if (has_async) { 38140510e8eSJosef 'Jeff' Sipek taskq_dispatch_ent(dbu_evict_taskq, dbu->dbu_evict_func_async, 38240510e8eSJosef 'Jeff' Sipek dbu, 0, &dbu->dbu_tqent); 38340510e8eSJosef 'Jeff' Sipek } 384fa9e4066Sahrens } 385fa9e4066Sahrens 386744947dcSTom Erickson boolean_t 387744947dcSTom Erickson dbuf_is_metadata(dmu_buf_impl_t *db) 388744947dcSTom Erickson { 389744947dcSTom Erickson if (db->db_level > 0) { 390744947dcSTom Erickson return (B_TRUE); 391744947dcSTom Erickson } else { 392744947dcSTom Erickson boolean_t is_metadata; 393744947dcSTom Erickson 394744947dcSTom Erickson DB_DNODE_ENTER(db); 395ad135b5dSChristopher Siden is_metadata = DMU_OT_IS_METADATA(DB_DNODE(db)->dn_type); 396744947dcSTom Erickson DB_DNODE_EXIT(db); 397744947dcSTom Erickson 398744947dcSTom Erickson return (is_metadata); 399744947dcSTom Erickson } 400744947dcSTom Erickson } 401744947dcSTom Erickson 402dcbf3bd6SGeorge Wilson /* 403dcbf3bd6SGeorge Wilson * This function *must* return indices evenly distributed between all 404dcbf3bd6SGeorge Wilson * sublists of the multilist. This is needed due to how the dbuf eviction 405dcbf3bd6SGeorge Wilson * code is laid out; dbuf_evict_thread() assumes dbufs are evenly 406dcbf3bd6SGeorge Wilson * distributed between all sublists and uses this assumption when 407dcbf3bd6SGeorge Wilson * deciding which sublist to evict from and how much to evict from it. 408dcbf3bd6SGeorge Wilson */ 409dcbf3bd6SGeorge Wilson unsigned int 410dcbf3bd6SGeorge Wilson dbuf_cache_multilist_index_func(multilist_t *ml, void *obj) 411ea8dc4b6Seschrock { 412dcbf3bd6SGeorge Wilson dmu_buf_impl_t *db = obj; 413ea8dc4b6Seschrock 414dcbf3bd6SGeorge Wilson /* 415dcbf3bd6SGeorge Wilson * The assumption here, is the hash value for a given 416dcbf3bd6SGeorge Wilson * dmu_buf_impl_t will remain constant throughout it's lifetime 417dcbf3bd6SGeorge Wilson * (i.e. it's objset, object, level and blkid fields don't change). 418dcbf3bd6SGeorge Wilson * Thus, we don't need to store the dbuf's sublist index 419dcbf3bd6SGeorge Wilson * on insertion, as this index can be recalculated on removal. 420dcbf3bd6SGeorge Wilson * 421dcbf3bd6SGeorge Wilson * Also, the low order bits of the hash value are thought to be 422dcbf3bd6SGeorge Wilson * distributed evenly. Otherwise, in the case that the multilist 423dcbf3bd6SGeorge Wilson * has a power of two number of sublists, each sublists' usage 424dcbf3bd6SGeorge Wilson * would not be evenly distributed. 425dcbf3bd6SGeorge Wilson */ 426dcbf3bd6SGeorge Wilson return (dbuf_hash(db->db_objset, db->db.db_object, 427dcbf3bd6SGeorge Wilson db->db_level, db->db_blkid) % 428dcbf3bd6SGeorge Wilson multilist_get_num_sublists(ml)); 429dcbf3bd6SGeorge Wilson } 430dcbf3bd6SGeorge Wilson 431dcbf3bd6SGeorge Wilson static inline boolean_t 432dcbf3bd6SGeorge Wilson dbuf_cache_above_hiwater(void) 433dcbf3bd6SGeorge Wilson { 434dcbf3bd6SGeorge Wilson uint64_t dbuf_cache_hiwater_bytes = 435dcbf3bd6SGeorge Wilson (dbuf_cache_max_bytes * dbuf_cache_hiwater_pct) / 100; 436dcbf3bd6SGeorge Wilson 437dcbf3bd6SGeorge Wilson return (refcount_count(&dbuf_cache_size) > 438dcbf3bd6SGeorge Wilson dbuf_cache_max_bytes + dbuf_cache_hiwater_bytes); 439dcbf3bd6SGeorge Wilson } 440dcbf3bd6SGeorge Wilson 441dcbf3bd6SGeorge Wilson static inline boolean_t 442dcbf3bd6SGeorge Wilson dbuf_cache_above_lowater(void) 443dcbf3bd6SGeorge Wilson { 444dcbf3bd6SGeorge Wilson uint64_t dbuf_cache_lowater_bytes = 445dcbf3bd6SGeorge Wilson (dbuf_cache_max_bytes * dbuf_cache_lowater_pct) / 100; 446dcbf3bd6SGeorge Wilson 447dcbf3bd6SGeorge Wilson return (refcount_count(&dbuf_cache_size) > 448dcbf3bd6SGeorge Wilson dbuf_cache_max_bytes - dbuf_cache_lowater_bytes); 449dcbf3bd6SGeorge Wilson } 450dcbf3bd6SGeorge Wilson 451dcbf3bd6SGeorge Wilson /* 452dcbf3bd6SGeorge Wilson * Evict the oldest eligible dbuf from the dbuf cache. 453dcbf3bd6SGeorge Wilson */ 454dcbf3bd6SGeorge Wilson static void 455dcbf3bd6SGeorge Wilson dbuf_evict_one(void) 456dcbf3bd6SGeorge Wilson { 457dcbf3bd6SGeorge Wilson int idx = multilist_get_random_index(&dbuf_cache); 458dcbf3bd6SGeorge Wilson multilist_sublist_t *mls = multilist_sublist_lock(&dbuf_cache, idx); 459dcbf3bd6SGeorge Wilson 460dcbf3bd6SGeorge Wilson ASSERT(!MUTEX_HELD(&dbuf_evict_lock)); 461dcbf3bd6SGeorge Wilson 462dcbf3bd6SGeorge Wilson /* 463dcbf3bd6SGeorge Wilson * Set the thread's tsd to indicate that it's processing evictions. 464dcbf3bd6SGeorge Wilson * Once a thread stops evicting from the dbuf cache it will 465dcbf3bd6SGeorge Wilson * reset its tsd to NULL. 466dcbf3bd6SGeorge Wilson */ 467dcbf3bd6SGeorge Wilson ASSERT3P(tsd_get(zfs_dbuf_evict_key), ==, NULL); 468dcbf3bd6SGeorge Wilson (void) tsd_set(zfs_dbuf_evict_key, (void *)B_TRUE); 469dcbf3bd6SGeorge Wilson 470dcbf3bd6SGeorge Wilson dmu_buf_impl_t *db = multilist_sublist_tail(mls); 471dcbf3bd6SGeorge Wilson while (db != NULL && mutex_tryenter(&db->db_mtx) == 0) { 472dcbf3bd6SGeorge Wilson db = multilist_sublist_prev(mls, db); 473dcbf3bd6SGeorge Wilson } 474dcbf3bd6SGeorge Wilson 475dcbf3bd6SGeorge Wilson DTRACE_PROBE2(dbuf__evict__one, dmu_buf_impl_t *, db, 476dcbf3bd6SGeorge Wilson multilist_sublist_t *, mls); 477dcbf3bd6SGeorge Wilson 478dcbf3bd6SGeorge Wilson if (db != NULL) { 479dcbf3bd6SGeorge Wilson multilist_sublist_remove(mls, db); 480dcbf3bd6SGeorge Wilson multilist_sublist_unlock(mls); 481dcbf3bd6SGeorge Wilson (void) refcount_remove_many(&dbuf_cache_size, 482dcbf3bd6SGeorge Wilson db->db.db_size, db); 483ea8dc4b6Seschrock dbuf_destroy(db); 484dcbf3bd6SGeorge Wilson } else { 485dcbf3bd6SGeorge Wilson multilist_sublist_unlock(mls); 486dcbf3bd6SGeorge Wilson } 487dcbf3bd6SGeorge Wilson (void) tsd_set(zfs_dbuf_evict_key, NULL); 488dcbf3bd6SGeorge Wilson } 489dcbf3bd6SGeorge Wilson 490dcbf3bd6SGeorge Wilson /* 491dcbf3bd6SGeorge Wilson * The dbuf evict thread is responsible for aging out dbufs from the 492dcbf3bd6SGeorge Wilson * cache. Once the cache has reached it's maximum size, dbufs are removed 493dcbf3bd6SGeorge Wilson * and destroyed. The eviction thread will continue running until the size 494dcbf3bd6SGeorge Wilson * of the dbuf cache is at or below the maximum size. Once the dbuf is aged 495dcbf3bd6SGeorge Wilson * out of the cache it is destroyed and becomes eligible for arc eviction. 496dcbf3bd6SGeorge Wilson */ 497dcbf3bd6SGeorge Wilson static void 498dcbf3bd6SGeorge Wilson dbuf_evict_thread(void) 499dcbf3bd6SGeorge Wilson { 500dcbf3bd6SGeorge Wilson callb_cpr_t cpr; 501dcbf3bd6SGeorge Wilson 502dcbf3bd6SGeorge Wilson CALLB_CPR_INIT(&cpr, &dbuf_evict_lock, callb_generic_cpr, FTAG); 503dcbf3bd6SGeorge Wilson 504dcbf3bd6SGeorge Wilson mutex_enter(&dbuf_evict_lock); 505dcbf3bd6SGeorge Wilson while (!dbuf_evict_thread_exit) { 506dcbf3bd6SGeorge Wilson while (!dbuf_cache_above_lowater() && !dbuf_evict_thread_exit) { 507dcbf3bd6SGeorge Wilson CALLB_CPR_SAFE_BEGIN(&cpr); 508dcbf3bd6SGeorge Wilson (void) cv_timedwait_hires(&dbuf_evict_cv, 509dcbf3bd6SGeorge Wilson &dbuf_evict_lock, SEC2NSEC(1), MSEC2NSEC(1), 0); 510dcbf3bd6SGeorge Wilson CALLB_CPR_SAFE_END(&cpr, &dbuf_evict_lock); 511dcbf3bd6SGeorge Wilson } 512dcbf3bd6SGeorge Wilson mutex_exit(&dbuf_evict_lock); 513dcbf3bd6SGeorge Wilson 514dcbf3bd6SGeorge Wilson /* 515dcbf3bd6SGeorge Wilson * Keep evicting as long as we're above the low water mark 516dcbf3bd6SGeorge Wilson * for the cache. We do this without holding the locks to 517dcbf3bd6SGeorge Wilson * minimize lock contention. 518dcbf3bd6SGeorge Wilson */ 519dcbf3bd6SGeorge Wilson while (dbuf_cache_above_lowater() && !dbuf_evict_thread_exit) { 520dcbf3bd6SGeorge Wilson dbuf_evict_one(); 521dcbf3bd6SGeorge Wilson } 522dcbf3bd6SGeorge Wilson 523dcbf3bd6SGeorge Wilson mutex_enter(&dbuf_evict_lock); 524dcbf3bd6SGeorge Wilson } 525dcbf3bd6SGeorge Wilson 526dcbf3bd6SGeorge Wilson dbuf_evict_thread_exit = B_FALSE; 527dcbf3bd6SGeorge Wilson cv_broadcast(&dbuf_evict_cv); 528dcbf3bd6SGeorge Wilson CALLB_CPR_EXIT(&cpr); /* drops dbuf_evict_lock */ 529dcbf3bd6SGeorge Wilson thread_exit(); 530dcbf3bd6SGeorge Wilson } 531dcbf3bd6SGeorge Wilson 532dcbf3bd6SGeorge Wilson /* 533dcbf3bd6SGeorge Wilson * Wake up the dbuf eviction thread if the dbuf cache is at its max size. 534dcbf3bd6SGeorge Wilson * If the dbuf cache is at its high water mark, then evict a dbuf from the 535dcbf3bd6SGeorge Wilson * dbuf cache using the callers context. 536dcbf3bd6SGeorge Wilson */ 537dcbf3bd6SGeorge Wilson static void 538dcbf3bd6SGeorge Wilson dbuf_evict_notify(void) 539dcbf3bd6SGeorge Wilson { 540dcbf3bd6SGeorge Wilson 541dcbf3bd6SGeorge Wilson /* 542dcbf3bd6SGeorge Wilson * We use thread specific data to track when a thread has 543dcbf3bd6SGeorge Wilson * started processing evictions. This allows us to avoid deeply 544dcbf3bd6SGeorge Wilson * nested stacks that would have a call flow similar to this: 545dcbf3bd6SGeorge Wilson * 546dcbf3bd6SGeorge Wilson * dbuf_rele()-->dbuf_rele_and_unlock()-->dbuf_evict_notify() 547dcbf3bd6SGeorge Wilson * ^ | 548dcbf3bd6SGeorge Wilson * | | 549dcbf3bd6SGeorge Wilson * +-----dbuf_destroy()<--dbuf_evict_one()<--------+ 550dcbf3bd6SGeorge Wilson * 551dcbf3bd6SGeorge Wilson * The dbuf_eviction_thread will always have its tsd set until 552dcbf3bd6SGeorge Wilson * that thread exits. All other threads will only set their tsd 553dcbf3bd6SGeorge Wilson * if they are participating in the eviction process. This only 554dcbf3bd6SGeorge Wilson * happens if the eviction thread is unable to process evictions 555dcbf3bd6SGeorge Wilson * fast enough. To keep the dbuf cache size in check, other threads 556dcbf3bd6SGeorge Wilson * can evict from the dbuf cache directly. Those threads will set 557dcbf3bd6SGeorge Wilson * their tsd values so that we ensure that they only evict one dbuf 558dcbf3bd6SGeorge Wilson * from the dbuf cache. 559dcbf3bd6SGeorge Wilson */ 560dcbf3bd6SGeorge Wilson if (tsd_get(zfs_dbuf_evict_key) != NULL) 561dcbf3bd6SGeorge Wilson return; 562dcbf3bd6SGeorge Wilson 563dcbf3bd6SGeorge Wilson if (refcount_count(&dbuf_cache_size) > dbuf_cache_max_bytes) { 564dcbf3bd6SGeorge Wilson boolean_t evict_now = B_FALSE; 565dcbf3bd6SGeorge Wilson 566dcbf3bd6SGeorge Wilson mutex_enter(&dbuf_evict_lock); 567dcbf3bd6SGeorge Wilson if (refcount_count(&dbuf_cache_size) > dbuf_cache_max_bytes) { 568dcbf3bd6SGeorge Wilson evict_now = dbuf_cache_above_hiwater(); 569dcbf3bd6SGeorge Wilson cv_signal(&dbuf_evict_cv); 570dcbf3bd6SGeorge Wilson } 571dcbf3bd6SGeorge Wilson mutex_exit(&dbuf_evict_lock); 572dcbf3bd6SGeorge Wilson 573dcbf3bd6SGeorge Wilson if (evict_now) { 574dcbf3bd6SGeorge Wilson dbuf_evict_one(); 575dcbf3bd6SGeorge Wilson } 576dcbf3bd6SGeorge Wilson } 577ea8dc4b6Seschrock } 578ea8dc4b6Seschrock 579ea8dc4b6Seschrock void 580fa9e4066Sahrens dbuf_init(void) 581fa9e4066Sahrens { 582ea8dc4b6Seschrock uint64_t hsize = 1ULL << 16; 583fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 584fa9e4066Sahrens int i; 585fa9e4066Sahrens 586fa9e4066Sahrens /* 587fa9e4066Sahrens * The hash table is big enough to fill all of physical memory 588ea8dc4b6Seschrock * with an average 4K block size. The table will take up 589ea8dc4b6Seschrock * totalmem*sizeof(void*)/4K (i.e. 2MB/GB with 8-byte pointers). 590fa9e4066Sahrens */ 591ea8dc4b6Seschrock while (hsize * 4096 < physmem * PAGESIZE) 592fa9e4066Sahrens hsize <<= 1; 593fa9e4066Sahrens 594ea8dc4b6Seschrock retry: 595fa9e4066Sahrens h->hash_table_mask = hsize - 1; 596ea8dc4b6Seschrock h->hash_table = kmem_zalloc(hsize * sizeof (void *), KM_NOSLEEP); 597ea8dc4b6Seschrock if (h->hash_table == NULL) { 598ea8dc4b6Seschrock /* XXX - we should really return an error instead of assert */ 599ea8dc4b6Seschrock ASSERT(hsize > (1ULL << 10)); 600ea8dc4b6Seschrock hsize >>= 1; 601ea8dc4b6Seschrock goto retry; 602ea8dc4b6Seschrock } 603fa9e4066Sahrens 604dcbf3bd6SGeorge Wilson dbuf_kmem_cache = kmem_cache_create("dmu_buf_impl_t", 605fa9e4066Sahrens sizeof (dmu_buf_impl_t), 606fa9e4066Sahrens 0, dbuf_cons, dbuf_dest, NULL, NULL, NULL, 0); 607fa9e4066Sahrens 608fa9e4066Sahrens for (i = 0; i < DBUF_MUTEXES; i++) 609fa9e4066Sahrens mutex_init(&h->hash_mutexes[i], NULL, MUTEX_DEFAULT, NULL); 610bc9014e6SJustin Gibbs 611bc9014e6SJustin Gibbs /* 612dcbf3bd6SGeorge Wilson * Setup the parameters for the dbuf cache. We cap the size of the 613dcbf3bd6SGeorge Wilson * dbuf cache to 1/32nd (default) of the size of the ARC. 614dcbf3bd6SGeorge Wilson */ 615dcbf3bd6SGeorge Wilson dbuf_cache_max_bytes = MIN(dbuf_cache_max_bytes, 616dcbf3bd6SGeorge Wilson arc_max_bytes() >> dbuf_cache_max_shift); 617dcbf3bd6SGeorge Wilson 618dcbf3bd6SGeorge Wilson /* 619bc9014e6SJustin Gibbs * All entries are queued via taskq_dispatch_ent(), so min/maxalloc 620bc9014e6SJustin Gibbs * configuration is not required. 621bc9014e6SJustin Gibbs */ 622bc9014e6SJustin Gibbs dbu_evict_taskq = taskq_create("dbu_evict", 1, minclsyspri, 0, 0, 0); 623dcbf3bd6SGeorge Wilson 624dcbf3bd6SGeorge Wilson multilist_create(&dbuf_cache, sizeof (dmu_buf_impl_t), 625dcbf3bd6SGeorge Wilson offsetof(dmu_buf_impl_t, db_cache_link), 626dcbf3bd6SGeorge Wilson zfs_arc_num_sublists_per_state, 627dcbf3bd6SGeorge Wilson dbuf_cache_multilist_index_func); 628dcbf3bd6SGeorge Wilson refcount_create(&dbuf_cache_size); 629dcbf3bd6SGeorge Wilson 630dcbf3bd6SGeorge Wilson tsd_create(&zfs_dbuf_evict_key, NULL); 631dcbf3bd6SGeorge Wilson dbuf_evict_thread_exit = B_FALSE; 632dcbf3bd6SGeorge Wilson mutex_init(&dbuf_evict_lock, NULL, MUTEX_DEFAULT, NULL); 633dcbf3bd6SGeorge Wilson cv_init(&dbuf_evict_cv, NULL, CV_DEFAULT, NULL); 634dcbf3bd6SGeorge Wilson dbuf_cache_evict_thread = thread_create(NULL, 0, dbuf_evict_thread, 635dcbf3bd6SGeorge Wilson NULL, 0, &p0, TS_RUN, minclsyspri); 636fa9e4066Sahrens } 637fa9e4066Sahrens 638fa9e4066Sahrens void 639fa9e4066Sahrens dbuf_fini(void) 640fa9e4066Sahrens { 641fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 642fa9e4066Sahrens int i; 643fa9e4066Sahrens 644fa9e4066Sahrens for (i = 0; i < DBUF_MUTEXES; i++) 645fa9e4066Sahrens mutex_destroy(&h->hash_mutexes[i]); 646fa9e4066Sahrens kmem_free(h->hash_table, (h->hash_table_mask + 1) * sizeof (void *)); 647dcbf3bd6SGeorge Wilson kmem_cache_destroy(dbuf_kmem_cache); 648bc9014e6SJustin Gibbs taskq_destroy(dbu_evict_taskq); 649dcbf3bd6SGeorge Wilson 650dcbf3bd6SGeorge Wilson mutex_enter(&dbuf_evict_lock); 651dcbf3bd6SGeorge Wilson dbuf_evict_thread_exit = B_TRUE; 652dcbf3bd6SGeorge Wilson while (dbuf_evict_thread_exit) { 653dcbf3bd6SGeorge Wilson cv_signal(&dbuf_evict_cv); 654dcbf3bd6SGeorge Wilson cv_wait(&dbuf_evict_cv, &dbuf_evict_lock); 655dcbf3bd6SGeorge Wilson } 656dcbf3bd6SGeorge Wilson mutex_exit(&dbuf_evict_lock); 657dcbf3bd6SGeorge Wilson tsd_destroy(&zfs_dbuf_evict_key); 658dcbf3bd6SGeorge Wilson 659dcbf3bd6SGeorge Wilson mutex_destroy(&dbuf_evict_lock); 660dcbf3bd6SGeorge Wilson cv_destroy(&dbuf_evict_cv); 661dcbf3bd6SGeorge Wilson 662dcbf3bd6SGeorge Wilson refcount_destroy(&dbuf_cache_size); 663dcbf3bd6SGeorge Wilson multilist_destroy(&dbuf_cache); 664fa9e4066Sahrens } 665fa9e4066Sahrens 666fa9e4066Sahrens /* 667fa9e4066Sahrens * Other stuff. 668fa9e4066Sahrens */ 669fa9e4066Sahrens 6709c9dc39aSek110237 #ifdef ZFS_DEBUG 671fa9e4066Sahrens static void 672fa9e4066Sahrens dbuf_verify(dmu_buf_impl_t *db) 673fa9e4066Sahrens { 674744947dcSTom Erickson dnode_t *dn; 675b24ab676SJeff Bonwick dbuf_dirty_record_t *dr; 676fa9e4066Sahrens 677fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 678fa9e4066Sahrens 679fa9e4066Sahrens if (!(zfs_flags & ZFS_DEBUG_DBUF_VERIFY)) 680fa9e4066Sahrens return; 681fa9e4066Sahrens 682fa9e4066Sahrens ASSERT(db->db_objset != NULL); 683744947dcSTom Erickson DB_DNODE_ENTER(db); 684744947dcSTom Erickson dn = DB_DNODE(db); 685fa9e4066Sahrens if (dn == NULL) { 686fa9e4066Sahrens ASSERT(db->db_parent == NULL); 687fa9e4066Sahrens ASSERT(db->db_blkptr == NULL); 688fa9e4066Sahrens } else { 689fa9e4066Sahrens ASSERT3U(db->db.db_object, ==, dn->dn_object); 690fa9e4066Sahrens ASSERT3P(db->db_objset, ==, dn->dn_objset); 691fa9e4066Sahrens ASSERT3U(db->db_level, <, dn->dn_nlevels); 692744947dcSTom Erickson ASSERT(db->db_blkid == DMU_BONUS_BLKID || 693744947dcSTom Erickson db->db_blkid == DMU_SPILL_BLKID || 6940f6d88adSAlex Reece !avl_is_empty(&dn->dn_dbufs)); 695fa9e4066Sahrens } 6960a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 697fa9e4066Sahrens ASSERT(dn != NULL); 6981934e92fSmaybee ASSERT3U(db->db.db_size, >=, dn->dn_bonuslen); 6990a586ceaSMark Shellenbaum ASSERT3U(db->db.db_offset, ==, DMU_BONUS_BLKID); 7000a586ceaSMark Shellenbaum } else if (db->db_blkid == DMU_SPILL_BLKID) { 7010a586ceaSMark Shellenbaum ASSERT(dn != NULL); 7020a586ceaSMark Shellenbaum ASSERT3U(db->db.db_size, >=, dn->dn_bonuslen); 703fb09f5aaSMadhav Suresh ASSERT0(db->db.db_offset); 704fa9e4066Sahrens } else { 705fa9e4066Sahrens ASSERT3U(db->db.db_offset, ==, db->db_blkid * db->db.db_size); 706fa9e4066Sahrens } 707fa9e4066Sahrens 708b24ab676SJeff Bonwick for (dr = db->db_data_pending; dr != NULL; dr = dr->dr_next) 709b24ab676SJeff Bonwick ASSERT(dr->dr_dbuf == db); 710b24ab676SJeff Bonwick 711b24ab676SJeff Bonwick for (dr = db->db_last_dirty; dr != NULL; dr = dr->dr_next) 712b24ab676SJeff Bonwick ASSERT(dr->dr_dbuf == db); 713b24ab676SJeff Bonwick 71488b7b0f2SMatthew Ahrens /* 71588b7b0f2SMatthew Ahrens * We can't assert that db_size matches dn_datablksz because it 71688b7b0f2SMatthew Ahrens * can be momentarily different when another thread is doing 71788b7b0f2SMatthew Ahrens * dnode_set_blksz(). 71888b7b0f2SMatthew Ahrens */ 71988b7b0f2SMatthew Ahrens if (db->db_level == 0 && db->db.db_object == DMU_META_DNODE_OBJECT) { 720b24ab676SJeff Bonwick dr = db->db_data_pending; 721fa9e4066Sahrens /* 72288b7b0f2SMatthew Ahrens * It should only be modified in syncing context, so 72388b7b0f2SMatthew Ahrens * make sure we only have one copy of the data. 724fa9e4066Sahrens */ 725c717a561Smaybee ASSERT(dr == NULL || dr->dt.dl.dr_data == db->db_buf); 726fa9e4066Sahrens } 727fa9e4066Sahrens 728fa9e4066Sahrens /* verify db->db_blkptr */ 729fa9e4066Sahrens if (db->db_blkptr) { 730fa9e4066Sahrens if (db->db_parent == dn->dn_dbuf) { 731fa9e4066Sahrens /* db is pointed to by the dnode */ 732fa9e4066Sahrens /* ASSERT3U(db->db_blkid, <, dn->dn_nblkptr); */ 73314843421SMatthew Ahrens if (DMU_OBJECT_IS_SPECIAL(db->db.db_object)) 734fa9e4066Sahrens ASSERT(db->db_parent == NULL); 735fa9e4066Sahrens else 736fa9e4066Sahrens ASSERT(db->db_parent != NULL); 7370a586ceaSMark Shellenbaum if (db->db_blkid != DMU_SPILL_BLKID) 738fa9e4066Sahrens ASSERT3P(db->db_blkptr, ==, 739fa9e4066Sahrens &dn->dn_phys->dn_blkptr[db->db_blkid]); 740fa9e4066Sahrens } else { 741fa9e4066Sahrens /* db is pointed to by an indirect block */ 742fa9e4066Sahrens int epb = db->db_parent->db.db_size >> SPA_BLKPTRSHIFT; 743fa9e4066Sahrens ASSERT3U(db->db_parent->db_level, ==, db->db_level+1); 744fa9e4066Sahrens ASSERT3U(db->db_parent->db.db_object, ==, 745fa9e4066Sahrens db->db.db_object); 746fa9e4066Sahrens /* 747fa9e4066Sahrens * dnode_grow_indblksz() can make this fail if we don't 748fa9e4066Sahrens * have the struct_rwlock. XXX indblksz no longer 749fa9e4066Sahrens * grows. safe to do this now? 750fa9e4066Sahrens */ 751744947dcSTom Erickson if (RW_WRITE_HELD(&dn->dn_struct_rwlock)) { 752fa9e4066Sahrens ASSERT3P(db->db_blkptr, ==, 753fa9e4066Sahrens ((blkptr_t *)db->db_parent->db.db_data + 754fa9e4066Sahrens db->db_blkid % epb)); 755fa9e4066Sahrens } 756fa9e4066Sahrens } 757fa9e4066Sahrens } 758fa9e4066Sahrens if ((db->db_blkptr == NULL || BP_IS_HOLE(db->db_blkptr)) && 7593f9d6ad7SLin Ling (db->db_buf == NULL || db->db_buf->b_data) && 7600a586ceaSMark Shellenbaum db->db.db_data && db->db_blkid != DMU_BONUS_BLKID && 761fa9e4066Sahrens db->db_state != DB_FILL && !dn->dn_free_txg) { 762fa9e4066Sahrens /* 763fa9e4066Sahrens * If the blkptr isn't set but they have nonzero data, 764fa9e4066Sahrens * it had better be dirty, otherwise we'll lose that 765fa9e4066Sahrens * data when we evict this buffer. 7668df0bcf0SPaul Dagnelie * 7678df0bcf0SPaul Dagnelie * There is an exception to this rule for indirect blocks; in 7688df0bcf0SPaul Dagnelie * this case, if the indirect block is a hole, we fill in a few 7698df0bcf0SPaul Dagnelie * fields on each of the child blocks (importantly, birth time) 7708df0bcf0SPaul Dagnelie * to prevent hole birth times from being lost when you 7718df0bcf0SPaul Dagnelie * partially fill in a hole. 772fa9e4066Sahrens */ 773fa9e4066Sahrens if (db->db_dirtycnt == 0) { 7748df0bcf0SPaul Dagnelie if (db->db_level == 0) { 775fa9e4066Sahrens uint64_t *buf = db->db.db_data; 776fa9e4066Sahrens int i; 777fa9e4066Sahrens 778fa9e4066Sahrens for (i = 0; i < db->db.db_size >> 3; i++) { 779fa9e4066Sahrens ASSERT(buf[i] == 0); 780fa9e4066Sahrens } 7818df0bcf0SPaul Dagnelie } else { 7828df0bcf0SPaul Dagnelie blkptr_t *bps = db->db.db_data; 7838df0bcf0SPaul Dagnelie ASSERT3U(1 << DB_DNODE(db)->dn_indblkshift, ==, 7848df0bcf0SPaul Dagnelie db->db.db_size); 7858df0bcf0SPaul Dagnelie /* 7868df0bcf0SPaul Dagnelie * We want to verify that all the blkptrs in the 7878df0bcf0SPaul Dagnelie * indirect block are holes, but we may have 7888df0bcf0SPaul Dagnelie * automatically set up a few fields for them. 7898df0bcf0SPaul Dagnelie * We iterate through each blkptr and verify 7908df0bcf0SPaul Dagnelie * they only have those fields set. 7918df0bcf0SPaul Dagnelie */ 7928df0bcf0SPaul Dagnelie for (int i = 0; 7938df0bcf0SPaul Dagnelie i < db->db.db_size / sizeof (blkptr_t); 7948df0bcf0SPaul Dagnelie i++) { 7958df0bcf0SPaul Dagnelie blkptr_t *bp = &bps[i]; 7968df0bcf0SPaul Dagnelie ASSERT(ZIO_CHECKSUM_IS_ZERO( 7978df0bcf0SPaul Dagnelie &bp->blk_cksum)); 7988df0bcf0SPaul Dagnelie ASSERT( 7998df0bcf0SPaul Dagnelie DVA_IS_EMPTY(&bp->blk_dva[0]) && 8008df0bcf0SPaul Dagnelie DVA_IS_EMPTY(&bp->blk_dva[1]) && 8018df0bcf0SPaul Dagnelie DVA_IS_EMPTY(&bp->blk_dva[2])); 8028df0bcf0SPaul Dagnelie ASSERT0(bp->blk_fill); 8038df0bcf0SPaul Dagnelie ASSERT0(bp->blk_pad[0]); 8048df0bcf0SPaul Dagnelie ASSERT0(bp->blk_pad[1]); 8058df0bcf0SPaul Dagnelie ASSERT(!BP_IS_EMBEDDED(bp)); 8068df0bcf0SPaul Dagnelie ASSERT(BP_IS_HOLE(bp)); 8078df0bcf0SPaul Dagnelie ASSERT0(bp->blk_phys_birth); 8088df0bcf0SPaul Dagnelie } 8098df0bcf0SPaul Dagnelie } 810fa9e4066Sahrens } 811fa9e4066Sahrens } 812744947dcSTom Erickson DB_DNODE_EXIT(db); 813fa9e4066Sahrens } 8149c9dc39aSek110237 #endif 815fa9e4066Sahrens 816fa9e4066Sahrens static void 817bc9014e6SJustin Gibbs dbuf_clear_data(dmu_buf_impl_t *db) 818fa9e4066Sahrens { 819fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 820ea8dc4b6Seschrock dbuf_evict_user(db); 821dcbf3bd6SGeorge Wilson ASSERT3P(db->db_buf, ==, NULL); 822ea8dc4b6Seschrock db->db.db_data = NULL; 82382c9918fSTim Haley if (db->db_state != DB_NOFILL) 824ea8dc4b6Seschrock db->db_state = DB_UNCACHED; 825ea8dc4b6Seschrock } 826bc9014e6SJustin Gibbs 827bc9014e6SJustin Gibbs static void 828bc9014e6SJustin Gibbs dbuf_set_data(dmu_buf_impl_t *db, arc_buf_t *buf) 829bc9014e6SJustin Gibbs { 830bc9014e6SJustin Gibbs ASSERT(MUTEX_HELD(&db->db_mtx)); 831bc9014e6SJustin Gibbs ASSERT(buf != NULL); 832bc9014e6SJustin Gibbs 833bc9014e6SJustin Gibbs db->db_buf = buf; 834bc9014e6SJustin Gibbs ASSERT(buf->b_data != NULL); 835bc9014e6SJustin Gibbs db->db.db_data = buf->b_data; 836fa9e4066Sahrens } 837fa9e4066Sahrens 838c242f9a0Schunli zhang - Sun Microsystems - Irvine United States /* 839c242f9a0Schunli zhang - Sun Microsystems - Irvine United States * Loan out an arc_buf for read. Return the loaned arc_buf. 840c242f9a0Schunli zhang - Sun Microsystems - Irvine United States */ 841c242f9a0Schunli zhang - Sun Microsystems - Irvine United States arc_buf_t * 842c242f9a0Schunli zhang - Sun Microsystems - Irvine United States dbuf_loan_arcbuf(dmu_buf_impl_t *db) 843c242f9a0Schunli zhang - Sun Microsystems - Irvine United States { 844c242f9a0Schunli zhang - Sun Microsystems - Irvine United States arc_buf_t *abuf; 845c242f9a0Schunli zhang - Sun Microsystems - Irvine United States 846dcbf3bd6SGeorge Wilson ASSERT(db->db_blkid != DMU_BONUS_BLKID); 847c242f9a0Schunli zhang - Sun Microsystems - Irvine United States mutex_enter(&db->db_mtx); 848c242f9a0Schunli zhang - Sun Microsystems - Irvine United States if (arc_released(db->db_buf) || refcount_count(&db->db_holds) > 1) { 849c242f9a0Schunli zhang - Sun Microsystems - Irvine United States int blksz = db->db.db_size; 85043466aaeSMax Grossman spa_t *spa = db->db_objset->os_spa; 851744947dcSTom Erickson 852c242f9a0Schunli zhang - Sun Microsystems - Irvine United States mutex_exit(&db->db_mtx); 8535602294fSDan Kimmel abuf = arc_loan_buf(spa, B_FALSE, blksz); 854c242f9a0Schunli zhang - Sun Microsystems - Irvine United States bcopy(db->db.db_data, abuf->b_data, blksz); 855c242f9a0Schunli zhang - Sun Microsystems - Irvine United States } else { 856c242f9a0Schunli zhang - Sun Microsystems - Irvine United States abuf = db->db_buf; 857c242f9a0Schunli zhang - Sun Microsystems - Irvine United States arc_loan_inuse_buf(abuf, db); 858dcbf3bd6SGeorge Wilson db->db_buf = NULL; 859bc9014e6SJustin Gibbs dbuf_clear_data(db); 860c242f9a0Schunli zhang - Sun Microsystems - Irvine United States mutex_exit(&db->db_mtx); 861c242f9a0Schunli zhang - Sun Microsystems - Irvine United States } 862c242f9a0Schunli zhang - Sun Microsystems - Irvine United States return (abuf); 863c242f9a0Schunli zhang - Sun Microsystems - Irvine United States } 864c242f9a0Schunli zhang - Sun Microsystems - Irvine United States 865a2cdcdd2SPaul Dagnelie /* 866a2cdcdd2SPaul Dagnelie * Calculate which level n block references the data at the level 0 offset 867a2cdcdd2SPaul Dagnelie * provided. 868a2cdcdd2SPaul Dagnelie */ 869fa9e4066Sahrens uint64_t 870a2cdcdd2SPaul Dagnelie dbuf_whichblock(dnode_t *dn, int64_t level, uint64_t offset) 871fa9e4066Sahrens { 872a2cdcdd2SPaul Dagnelie if (dn->dn_datablkshift != 0 && dn->dn_indblkshift != 0) { 873a2cdcdd2SPaul Dagnelie /* 874a2cdcdd2SPaul Dagnelie * The level n blkid is equal to the level 0 blkid divided by 875a2cdcdd2SPaul Dagnelie * the number of level 0s in a level n block. 876a2cdcdd2SPaul Dagnelie * 877a2cdcdd2SPaul Dagnelie * The level 0 blkid is offset >> datablkshift = 878a2cdcdd2SPaul Dagnelie * offset / 2^datablkshift. 879a2cdcdd2SPaul Dagnelie * 880a2cdcdd2SPaul Dagnelie * The number of level 0s in a level n is the number of block 881a2cdcdd2SPaul Dagnelie * pointers in an indirect block, raised to the power of level. 882a2cdcdd2SPaul Dagnelie * This is 2^(indblkshift - SPA_BLKPTRSHIFT)^level = 883a2cdcdd2SPaul Dagnelie * 2^(level*(indblkshift - SPA_BLKPTRSHIFT)). 884a2cdcdd2SPaul Dagnelie * 885a2cdcdd2SPaul Dagnelie * Thus, the level n blkid is: offset / 886a2cdcdd2SPaul Dagnelie * ((2^datablkshift)*(2^(level*(indblkshift - SPA_BLKPTRSHIFT))) 887a2cdcdd2SPaul Dagnelie * = offset / 2^(datablkshift + level * 888a2cdcdd2SPaul Dagnelie * (indblkshift - SPA_BLKPTRSHIFT)) 889a2cdcdd2SPaul Dagnelie * = offset >> (datablkshift + level * 890a2cdcdd2SPaul Dagnelie * (indblkshift - SPA_BLKPTRSHIFT)) 891a2cdcdd2SPaul Dagnelie */ 892a2cdcdd2SPaul Dagnelie return (offset >> (dn->dn_datablkshift + level * 893a2cdcdd2SPaul Dagnelie (dn->dn_indblkshift - SPA_BLKPTRSHIFT))); 894fa9e4066Sahrens } else { 895fa9e4066Sahrens ASSERT3U(offset, <, dn->dn_datablksz); 896fa9e4066Sahrens return (0); 897fa9e4066Sahrens } 898fa9e4066Sahrens } 899fa9e4066Sahrens 900fa9e4066Sahrens static void 901fa9e4066Sahrens dbuf_read_done(zio_t *zio, arc_buf_t *buf, void *vdb) 902fa9e4066Sahrens { 903fa9e4066Sahrens dmu_buf_impl_t *db = vdb; 904fa9e4066Sahrens 905fa9e4066Sahrens mutex_enter(&db->db_mtx); 906fa9e4066Sahrens ASSERT3U(db->db_state, ==, DB_READ); 907fa9e4066Sahrens /* 908fa9e4066Sahrens * All reads are synchronous, so we must have a hold on the dbuf 909fa9e4066Sahrens */ 910fa9e4066Sahrens ASSERT(refcount_count(&db->db_holds) > 0); 911ea8dc4b6Seschrock ASSERT(db->db_buf == NULL); 912fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 913c717a561Smaybee if (db->db_level == 0 && db->db_freed_in_flight) { 914fa9e4066Sahrens /* we were freed in flight; disregard any error */ 915fa9e4066Sahrens arc_release(buf, db); 916fa9e4066Sahrens bzero(buf->b_data, db->db.db_size); 9176b4acc8bSahrens arc_buf_freeze(buf); 918c717a561Smaybee db->db_freed_in_flight = FALSE; 919fa9e4066Sahrens dbuf_set_data(db, buf); 920fa9e4066Sahrens db->db_state = DB_CACHED; 921fa9e4066Sahrens } else if (zio == NULL || zio->io_error == 0) { 922fa9e4066Sahrens dbuf_set_data(db, buf); 923fa9e4066Sahrens db->db_state = DB_CACHED; 924fa9e4066Sahrens } else { 9250a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 926fa9e4066Sahrens ASSERT3P(db->db_buf, ==, NULL); 927dcbf3bd6SGeorge Wilson arc_buf_destroy(buf, db); 928ea8dc4b6Seschrock db->db_state = DB_UNCACHED; 929fa9e4066Sahrens } 930fa9e4066Sahrens cv_broadcast(&db->db_changed); 9313f9d6ad7SLin Ling dbuf_rele_and_unlock(db, NULL); 932fa9e4066Sahrens } 933fa9e4066Sahrens 934ea8dc4b6Seschrock static void 935cf6106c8SMatthew Ahrens dbuf_read_impl(dmu_buf_impl_t *db, zio_t *zio, uint32_t flags) 936fa9e4066Sahrens { 937744947dcSTom Erickson dnode_t *dn; 9387802d7bfSMatthew Ahrens zbookmark_phys_t zb; 9397adb730bSGeorge Wilson arc_flags_t aflags = ARC_FLAG_NOWAIT; 940fa9e4066Sahrens 941744947dcSTom Erickson DB_DNODE_ENTER(db); 942744947dcSTom Erickson dn = DB_DNODE(db); 943fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 944fa9e4066Sahrens /* We need the struct_rwlock to prevent db_blkptr from changing. */ 945088f3894Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 946ea8dc4b6Seschrock ASSERT(MUTEX_HELD(&db->db_mtx)); 947ea8dc4b6Seschrock ASSERT(db->db_state == DB_UNCACHED); 948ea8dc4b6Seschrock ASSERT(db->db_buf == NULL); 949fa9e4066Sahrens 9500a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 951cf04dda1SMark Maybee int bonuslen = MIN(dn->dn_bonuslen, dn->dn_phys->dn_bonuslen); 9521934e92fSmaybee 9531934e92fSmaybee ASSERT3U(bonuslen, <=, db->db.db_size); 954ea8dc4b6Seschrock db->db.db_data = zio_buf_alloc(DN_MAX_BONUSLEN); 9555a98e54bSBrendan Gregg - Sun Microsystems arc_space_consume(DN_MAX_BONUSLEN, ARC_SPACE_OTHER); 9561934e92fSmaybee if (bonuslen < DN_MAX_BONUSLEN) 957ea8dc4b6Seschrock bzero(db->db.db_data, DN_MAX_BONUSLEN); 958cf04dda1SMark Maybee if (bonuslen) 959cf04dda1SMark Maybee bcopy(DN_BONUS(dn->dn_phys), db->db.db_data, bonuslen); 960744947dcSTom Erickson DB_DNODE_EXIT(db); 961fa9e4066Sahrens db->db_state = DB_CACHED; 962fa9e4066Sahrens mutex_exit(&db->db_mtx); 963fa9e4066Sahrens return; 964fa9e4066Sahrens } 965fa9e4066Sahrens 9661c8564a7SMark Maybee /* 9671c8564a7SMark Maybee * Recheck BP_IS_HOLE() after dnode_block_freed() in case dnode_sync() 9681c8564a7SMark Maybee * processes the delete record and clears the bp while we are waiting 9691c8564a7SMark Maybee * for the dn_mtx (resulting in a "no" from block_freed). 9701c8564a7SMark Maybee */ 971088f3894Sahrens if (db->db_blkptr == NULL || BP_IS_HOLE(db->db_blkptr) || 9721c8564a7SMark Maybee (db->db_level == 0 && (dnode_block_freed(dn, db->db_blkid) || 9731c8564a7SMark Maybee BP_IS_HOLE(db->db_blkptr)))) { 974ad23a2dbSjohansen arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 975ad23a2dbSjohansen 9765602294fSDan Kimmel dbuf_set_data(db, arc_alloc_buf(db->db_objset->os_spa, db, type, 9775602294fSDan Kimmel db->db.db_size)); 978fa9e4066Sahrens bzero(db->db.db_data, db->db.db_size); 9798df0bcf0SPaul Dagnelie 9808df0bcf0SPaul Dagnelie if (db->db_blkptr != NULL && db->db_level > 0 && 9818df0bcf0SPaul Dagnelie BP_IS_HOLE(db->db_blkptr) && 9828df0bcf0SPaul Dagnelie db->db_blkptr->blk_birth != 0) { 9838df0bcf0SPaul Dagnelie blkptr_t *bps = db->db.db_data; 9848df0bcf0SPaul Dagnelie for (int i = 0; i < ((1 << 9858df0bcf0SPaul Dagnelie DB_DNODE(db)->dn_indblkshift) / sizeof (blkptr_t)); 9868df0bcf0SPaul Dagnelie i++) { 9878df0bcf0SPaul Dagnelie blkptr_t *bp = &bps[i]; 9888df0bcf0SPaul Dagnelie ASSERT3U(BP_GET_LSIZE(db->db_blkptr), ==, 9898df0bcf0SPaul Dagnelie 1 << dn->dn_indblkshift); 9908df0bcf0SPaul Dagnelie BP_SET_LSIZE(bp, 9918df0bcf0SPaul Dagnelie BP_GET_LEVEL(db->db_blkptr) == 1 ? 9928df0bcf0SPaul Dagnelie dn->dn_datablksz : 9938df0bcf0SPaul Dagnelie BP_GET_LSIZE(db->db_blkptr)); 9948df0bcf0SPaul Dagnelie BP_SET_TYPE(bp, BP_GET_TYPE(db->db_blkptr)); 9958df0bcf0SPaul Dagnelie BP_SET_LEVEL(bp, 9968df0bcf0SPaul Dagnelie BP_GET_LEVEL(db->db_blkptr) - 1); 9978df0bcf0SPaul Dagnelie BP_SET_BIRTH(bp, db->db_blkptr->blk_birth, 0); 9988df0bcf0SPaul Dagnelie } 9998df0bcf0SPaul Dagnelie } 10008df0bcf0SPaul Dagnelie DB_DNODE_EXIT(db); 1001fa9e4066Sahrens db->db_state = DB_CACHED; 1002fa9e4066Sahrens mutex_exit(&db->db_mtx); 1003fa9e4066Sahrens return; 1004fa9e4066Sahrens } 1005fa9e4066Sahrens 1006744947dcSTom Erickson DB_DNODE_EXIT(db); 1007744947dcSTom Erickson 1008fa9e4066Sahrens db->db_state = DB_READ; 1009fa9e4066Sahrens mutex_exit(&db->db_mtx); 1010fa9e4066Sahrens 10113baa08fcSek110237 if (DBUF_IS_L2CACHEABLE(db)) 10127adb730bSGeorge Wilson aflags |= ARC_FLAG_L2CACHE; 10133baa08fcSek110237 1014b24ab676SJeff Bonwick SET_BOOKMARK(&zb, db->db_objset->os_dsl_dataset ? 1015b24ab676SJeff Bonwick db->db_objset->os_dsl_dataset->ds_object : DMU_META_OBJSET, 1016b24ab676SJeff Bonwick db->db.db_object, db->db_level, db->db_blkid); 1017ea8dc4b6Seschrock 1018ea8dc4b6Seschrock dbuf_add_ref(db, NULL); 1019088f3894Sahrens 102043466aaeSMax Grossman (void) arc_read(zio, db->db_objset->os_spa, db->db_blkptr, 1021fa9e4066Sahrens dbuf_read_done, db, ZIO_PRIORITY_SYNC_READ, 1022cf6106c8SMatthew Ahrens (flags & DB_RF_CANFAIL) ? ZIO_FLAG_CANFAIL : ZIO_FLAG_MUSTSUCCEED, 102313506d1eSmaybee &aflags, &zb); 1024fa9e4066Sahrens } 1025fa9e4066Sahrens 10265602294fSDan Kimmel /* 10275602294fSDan Kimmel * This is our just-in-time copy function. It makes a copy of buffers that 10285602294fSDan Kimmel * have been modified in a previous transaction group before we access them in 10295602294fSDan Kimmel * the current active group. 10305602294fSDan Kimmel * 10315602294fSDan Kimmel * This function is used in three places: when we are dirtying a buffer for the 10325602294fSDan Kimmel * first time in a txg, when we are freeing a range in a dnode that includes 10335602294fSDan Kimmel * this buffer, and when we are accessing a buffer which was received compressed 10345602294fSDan Kimmel * and later referenced in a WRITE_BYREF record. 10355602294fSDan Kimmel * 10365602294fSDan Kimmel * Note that when we are called from dbuf_free_range() we do not put a hold on 10375602294fSDan Kimmel * the buffer, we just traverse the active dbuf list for the dnode. 10385602294fSDan Kimmel */ 10395602294fSDan Kimmel static void 10405602294fSDan Kimmel dbuf_fix_old_data(dmu_buf_impl_t *db, uint64_t txg) 10415602294fSDan Kimmel { 10425602294fSDan Kimmel dbuf_dirty_record_t *dr = db->db_last_dirty; 10435602294fSDan Kimmel 10445602294fSDan Kimmel ASSERT(MUTEX_HELD(&db->db_mtx)); 10455602294fSDan Kimmel ASSERT(db->db.db_data != NULL); 10465602294fSDan Kimmel ASSERT(db->db_level == 0); 10475602294fSDan Kimmel ASSERT(db->db.db_object != DMU_META_DNODE_OBJECT); 10485602294fSDan Kimmel 10495602294fSDan Kimmel if (dr == NULL || 10505602294fSDan Kimmel (dr->dt.dl.dr_data != 10515602294fSDan Kimmel ((db->db_blkid == DMU_BONUS_BLKID) ? db->db.db_data : db->db_buf))) 10525602294fSDan Kimmel return; 10535602294fSDan Kimmel 10545602294fSDan Kimmel /* 10555602294fSDan Kimmel * If the last dirty record for this dbuf has not yet synced 10565602294fSDan Kimmel * and its referencing the dbuf data, either: 10575602294fSDan Kimmel * reset the reference to point to a new copy, 10585602294fSDan Kimmel * or (if there a no active holders) 10595602294fSDan Kimmel * just null out the current db_data pointer. 10605602294fSDan Kimmel */ 10615602294fSDan Kimmel ASSERT(dr->dr_txg >= txg - 2); 10625602294fSDan Kimmel if (db->db_blkid == DMU_BONUS_BLKID) { 10635602294fSDan Kimmel /* Note that the data bufs here are zio_bufs */ 10645602294fSDan Kimmel dr->dt.dl.dr_data = zio_buf_alloc(DN_MAX_BONUSLEN); 10655602294fSDan Kimmel arc_space_consume(DN_MAX_BONUSLEN, ARC_SPACE_OTHER); 10665602294fSDan Kimmel bcopy(db->db.db_data, dr->dt.dl.dr_data, DN_MAX_BONUSLEN); 10675602294fSDan Kimmel } else if (refcount_count(&db->db_holds) > db->db_dirtycnt) { 10685602294fSDan Kimmel int size = arc_buf_size(db->db_buf); 10695602294fSDan Kimmel arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 10705602294fSDan Kimmel spa_t *spa = db->db_objset->os_spa; 10715602294fSDan Kimmel enum zio_compress compress_type = 10725602294fSDan Kimmel arc_get_compression(db->db_buf); 10735602294fSDan Kimmel 10745602294fSDan Kimmel if (compress_type == ZIO_COMPRESS_OFF) { 10755602294fSDan Kimmel dr->dt.dl.dr_data = arc_alloc_buf(spa, db, type, size); 10765602294fSDan Kimmel } else { 10775602294fSDan Kimmel ASSERT3U(type, ==, ARC_BUFC_DATA); 10785602294fSDan Kimmel dr->dt.dl.dr_data = arc_alloc_compressed_buf(spa, db, 10795602294fSDan Kimmel size, arc_buf_lsize(db->db_buf), compress_type); 10805602294fSDan Kimmel } 10815602294fSDan Kimmel bcopy(db->db.db_data, dr->dt.dl.dr_data->b_data, size); 10825602294fSDan Kimmel } else { 10835602294fSDan Kimmel db->db_buf = NULL; 10845602294fSDan Kimmel dbuf_clear_data(db); 10855602294fSDan Kimmel } 10865602294fSDan Kimmel } 10875602294fSDan Kimmel 1088ea8dc4b6Seschrock int 1089ea8dc4b6Seschrock dbuf_read(dmu_buf_impl_t *db, zio_t *zio, uint32_t flags) 1090fa9e4066Sahrens { 1091ea8dc4b6Seschrock int err = 0; 109243466aaeSMax Grossman boolean_t havepzio = (zio != NULL); 109343466aaeSMax Grossman boolean_t prefetch; 1094744947dcSTom Erickson dnode_t *dn; 1095fa9e4066Sahrens 1096fa9e4066Sahrens /* 1097fa9e4066Sahrens * We don't have to hold the mutex to check db_state because it 1098fa9e4066Sahrens * can't be freed while we have a hold on the buffer. 1099fa9e4066Sahrens */ 1100fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 1101fa9e4066Sahrens 110282c9918fSTim Haley if (db->db_state == DB_NOFILL) 1103be6fd75aSMatthew Ahrens return (SET_ERROR(EIO)); 110482c9918fSTim Haley 1105744947dcSTom Erickson DB_DNODE_ENTER(db); 1106744947dcSTom Erickson dn = DB_DNODE(db); 1107fa9e4066Sahrens if ((flags & DB_RF_HAVESTRUCT) == 0) 1108744947dcSTom Erickson rw_enter(&dn->dn_struct_rwlock, RW_READER); 1109fa9e4066Sahrens 11100a586ceaSMark Shellenbaum prefetch = db->db_level == 0 && db->db_blkid != DMU_BONUS_BLKID && 1111744947dcSTom Erickson (flags & DB_RF_NOPREFETCH) == 0 && dn != NULL && 11123baa08fcSek110237 DBUF_IS_CACHEABLE(db); 111313506d1eSmaybee 1114fa9e4066Sahrens mutex_enter(&db->db_mtx); 1115ea8dc4b6Seschrock if (db->db_state == DB_CACHED) { 11165602294fSDan Kimmel /* 11175602294fSDan Kimmel * If the arc buf is compressed, we need to decompress it to 11185602294fSDan Kimmel * read the data. This could happen during the "zfs receive" of 11195602294fSDan Kimmel * a stream which is compressed and deduplicated. 11205602294fSDan Kimmel */ 11215602294fSDan Kimmel if (db->db_buf != NULL && 11225602294fSDan Kimmel arc_get_compression(db->db_buf) != ZIO_COMPRESS_OFF) { 11235602294fSDan Kimmel dbuf_fix_old_data(db, 11245602294fSDan Kimmel spa_syncing_txg(dmu_objset_spa(db->db_objset))); 11255602294fSDan Kimmel err = arc_decompress(db->db_buf); 11265602294fSDan Kimmel dbuf_set_data(db, db->db_buf); 11275602294fSDan Kimmel } 1128ea8dc4b6Seschrock mutex_exit(&db->db_mtx); 112913506d1eSmaybee if (prefetch) 1130cb92f413SAlexander Motin dmu_zfetch(&dn->dn_zfetch, db->db_blkid, 1, B_TRUE); 1131ea8dc4b6Seschrock if ((flags & DB_RF_HAVESTRUCT) == 0) 1132744947dcSTom Erickson rw_exit(&dn->dn_struct_rwlock); 1133744947dcSTom Erickson DB_DNODE_EXIT(db); 1134ea8dc4b6Seschrock } else if (db->db_state == DB_UNCACHED) { 1135744947dcSTom Erickson spa_t *spa = dn->dn_objset->os_spa; 1136744947dcSTom Erickson 1137744947dcSTom Erickson if (zio == NULL) 1138744947dcSTom Erickson zio = zio_root(spa, NULL, NULL, ZIO_FLAG_CANFAIL); 1139cf6106c8SMatthew Ahrens dbuf_read_impl(db, zio, flags); 114013506d1eSmaybee 1141ea8dc4b6Seschrock /* dbuf_read_impl has dropped db_mtx for us */ 1142ea8dc4b6Seschrock 114313506d1eSmaybee if (prefetch) 1144cb92f413SAlexander Motin dmu_zfetch(&dn->dn_zfetch, db->db_blkid, 1, B_TRUE); 1145ea8dc4b6Seschrock 1146ea8dc4b6Seschrock if ((flags & DB_RF_HAVESTRUCT) == 0) 1147744947dcSTom Erickson rw_exit(&dn->dn_struct_rwlock); 1148744947dcSTom Erickson DB_DNODE_EXIT(db); 1149ea8dc4b6Seschrock 1150ea8dc4b6Seschrock if (!havepzio) 1151ea8dc4b6Seschrock err = zio_wait(zio); 1152ea8dc4b6Seschrock } else { 11533e30c24aSWill Andrews /* 11543e30c24aSWill Andrews * Another reader came in while the dbuf was in flight 11553e30c24aSWill Andrews * between UNCACHED and CACHED. Either a writer will finish 11563e30c24aSWill Andrews * writing the buffer (sending the dbuf to CACHED) or the 11573e30c24aSWill Andrews * first reader's request will reach the read_done callback 11583e30c24aSWill Andrews * and send the dbuf to CACHED. Otherwise, a failure 11593e30c24aSWill Andrews * occurred and the dbuf went to UNCACHED. 11603e30c24aSWill Andrews */ 116113506d1eSmaybee mutex_exit(&db->db_mtx); 116213506d1eSmaybee if (prefetch) 1163cb92f413SAlexander Motin dmu_zfetch(&dn->dn_zfetch, db->db_blkid, 1, B_TRUE); 1164ea8dc4b6Seschrock if ((flags & DB_RF_HAVESTRUCT) == 0) 1165744947dcSTom Erickson rw_exit(&dn->dn_struct_rwlock); 1166744947dcSTom Erickson DB_DNODE_EXIT(db); 116713506d1eSmaybee 11683e30c24aSWill Andrews /* Skip the wait per the caller's request. */ 116913506d1eSmaybee mutex_enter(&db->db_mtx); 1170ea8dc4b6Seschrock if ((flags & DB_RF_NEVERWAIT) == 0) { 1171ea8dc4b6Seschrock while (db->db_state == DB_READ || 1172ea8dc4b6Seschrock db->db_state == DB_FILL) { 1173fa9e4066Sahrens ASSERT(db->db_state == DB_READ || 1174fa9e4066Sahrens (flags & DB_RF_HAVESTRUCT) == 0); 1175f6164ad6SAdam H. Leventhal DTRACE_PROBE2(blocked__read, dmu_buf_impl_t *, 1176f6164ad6SAdam H. Leventhal db, zio_t *, zio); 1177fa9e4066Sahrens cv_wait(&db->db_changed, &db->db_mtx); 1178fa9e4066Sahrens } 1179ea8dc4b6Seschrock if (db->db_state == DB_UNCACHED) 1180be6fd75aSMatthew Ahrens err = SET_ERROR(EIO); 1181ea8dc4b6Seschrock } 1182fa9e4066Sahrens mutex_exit(&db->db_mtx); 1183fa9e4066Sahrens } 1184fa9e4066Sahrens 1185ea8dc4b6Seschrock ASSERT(err || havepzio || db->db_state == DB_CACHED); 1186ea8dc4b6Seschrock return (err); 1187fa9e4066Sahrens } 1188fa9e4066Sahrens 1189fa9e4066Sahrens static void 1190fa9e4066Sahrens dbuf_noread(dmu_buf_impl_t *db) 1191fa9e4066Sahrens { 1192fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 11930a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 1194fa9e4066Sahrens mutex_enter(&db->db_mtx); 1195fa9e4066Sahrens while (db->db_state == DB_READ || db->db_state == DB_FILL) 1196fa9e4066Sahrens cv_wait(&db->db_changed, &db->db_mtx); 1197fa9e4066Sahrens if (db->db_state == DB_UNCACHED) { 1198ad23a2dbSjohansen arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 119943466aaeSMax Grossman spa_t *spa = db->db_objset->os_spa; 1200ad23a2dbSjohansen 1201ea8dc4b6Seschrock ASSERT(db->db_buf == NULL); 1202fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 12035602294fSDan Kimmel dbuf_set_data(db, arc_alloc_buf(spa, db, type, db->db.db_size)); 1204fa9e4066Sahrens db->db_state = DB_FILL; 120582c9918fSTim Haley } else if (db->db_state == DB_NOFILL) { 1206bc9014e6SJustin Gibbs dbuf_clear_data(db); 1207fa9e4066Sahrens } else { 1208fa9e4066Sahrens ASSERT3U(db->db_state, ==, DB_CACHED); 1209fa9e4066Sahrens } 1210fa9e4066Sahrens mutex_exit(&db->db_mtx); 1211fa9e4066Sahrens } 1212fa9e4066Sahrens 1213fa9e4066Sahrens void 1214c717a561Smaybee dbuf_unoverride(dbuf_dirty_record_t *dr) 1215fa9e4066Sahrens { 1216c717a561Smaybee dmu_buf_impl_t *db = dr->dr_dbuf; 1217b24ab676SJeff Bonwick blkptr_t *bp = &dr->dt.dl.dr_overridden_by; 1218c717a561Smaybee uint64_t txg = dr->dr_txg; 1219c5c6ffa0Smaybee 1220c717a561Smaybee ASSERT(MUTEX_HELD(&db->db_mtx)); 1221c717a561Smaybee ASSERT(dr->dt.dl.dr_override_state != DR_IN_DMU_SYNC); 1222c717a561Smaybee ASSERT(db->db_level == 0); 1223c717a561Smaybee 12240a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID || 1225c717a561Smaybee dr->dt.dl.dr_override_state == DR_NOT_OVERRIDDEN) 1226c717a561Smaybee return; 1227c717a561Smaybee 1228b24ab676SJeff Bonwick ASSERT(db->db_data_pending != dr); 1229b24ab676SJeff Bonwick 1230fa9e4066Sahrens /* free this block */ 123143466aaeSMax Grossman if (!BP_IS_HOLE(bp) && !dr->dt.dl.dr_nopwrite) 123243466aaeSMax Grossman zio_free(db->db_objset->os_spa, txg, bp); 1233b24ab676SJeff Bonwick 1234c717a561Smaybee dr->dt.dl.dr_override_state = DR_NOT_OVERRIDDEN; 123580901aeaSGeorge Wilson dr->dt.dl.dr_nopwrite = B_FALSE; 123680901aeaSGeorge Wilson 12376b4acc8bSahrens /* 12386b4acc8bSahrens * Release the already-written buffer, so we leave it in 12396b4acc8bSahrens * a consistent dirty state. Note that all callers are 12406b4acc8bSahrens * modifying the buffer, so they will immediately do 12416b4acc8bSahrens * another (redundant) arc_release(). Therefore, leave 12426b4acc8bSahrens * the buf thawed to save the effort of freezing & 12436b4acc8bSahrens * immediately re-thawing it. 12446b4acc8bSahrens */ 1245c717a561Smaybee arc_release(dr->dt.dl.dr_data, db); 1246fa9e4066Sahrens } 1247fa9e4066Sahrens 1248cdb0ab79Smaybee /* 1249cdb0ab79Smaybee * Evict (if its unreferenced) or clear (if its referenced) any level-0 1250cdb0ab79Smaybee * data blocks in the free range, so that any future readers will find 125143466aaeSMax Grossman * empty blocks. 1252cdb0ab79Smaybee */ 1253fa9e4066Sahrens void 12540f6d88adSAlex Reece dbuf_free_range(dnode_t *dn, uint64_t start_blkid, uint64_t end_blkid, 12550f6d88adSAlex Reece dmu_tx_t *tx) 1256fa9e4066Sahrens { 1257bc9014e6SJustin Gibbs dmu_buf_impl_t db_search; 1258bc9014e6SJustin Gibbs dmu_buf_impl_t *db, *db_next; 1259fa9e4066Sahrens uint64_t txg = tx->tx_txg; 12600f6d88adSAlex Reece avl_index_t where; 1261fa9e4066Sahrens 1262653af1b8SStephen Blinick if (end_blkid > dn->dn_maxblkid && 1263653af1b8SStephen Blinick !(start_blkid == DMU_SPILL_BLKID || end_blkid == DMU_SPILL_BLKID)) 12640f6d88adSAlex Reece end_blkid = dn->dn_maxblkid; 12650f6d88adSAlex Reece dprintf_dnode(dn, "start=%llu end=%llu\n", start_blkid, end_blkid); 12660f6d88adSAlex Reece 12670f6d88adSAlex Reece db_search.db_level = 0; 12680f6d88adSAlex Reece db_search.db_blkid = start_blkid; 126986bb58aeSAlex Reece db_search.db_state = DB_SEARCH; 12702f3d8780SMatthew Ahrens 1271713d6c20SMatthew Ahrens mutex_enter(&dn->dn_dbufs_mtx); 12720f6d88adSAlex Reece db = avl_find(&dn->dn_dbufs, &db_search, &where); 12730f6d88adSAlex Reece ASSERT3P(db, ==, NULL); 12742f3d8780SMatthew Ahrens 12750f6d88adSAlex Reece db = avl_nearest(&dn->dn_dbufs, where, AVL_AFTER); 12760f6d88adSAlex Reece 12770f6d88adSAlex Reece for (; db != NULL; db = db_next) { 12780f6d88adSAlex Reece db_next = AVL_NEXT(&dn->dn_dbufs, db); 12790a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 1280cdb0ab79Smaybee 12810f6d88adSAlex Reece if (db->db_level != 0 || db->db_blkid > end_blkid) { 12820f6d88adSAlex Reece break; 12830f6d88adSAlex Reece } 12840f6d88adSAlex Reece ASSERT3U(db->db_blkid, >=, start_blkid); 1285fa9e4066Sahrens 1286fa9e4066Sahrens /* found a level 0 buffer in the range */ 1287fa9e4066Sahrens mutex_enter(&db->db_mtx); 12883b2aab18SMatthew Ahrens if (dbuf_undirty(db, tx)) { 12893b2aab18SMatthew Ahrens /* mutex has been dropped and dbuf destroyed */ 12903b2aab18SMatthew Ahrens continue; 12913b2aab18SMatthew Ahrens } 12923b2aab18SMatthew Ahrens 1293ea8dc4b6Seschrock if (db->db_state == DB_UNCACHED || 129482c9918fSTim Haley db->db_state == DB_NOFILL || 1295ea8dc4b6Seschrock db->db_state == DB_EVICTING) { 1296fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 1297fa9e4066Sahrens mutex_exit(&db->db_mtx); 1298fa9e4066Sahrens continue; 1299fa9e4066Sahrens } 1300c543ec06Sahrens if (db->db_state == DB_READ || db->db_state == DB_FILL) { 1301c543ec06Sahrens /* will be handled in dbuf_read_done or dbuf_rele */ 1302c717a561Smaybee db->db_freed_in_flight = TRUE; 1303fa9e4066Sahrens mutex_exit(&db->db_mtx); 1304fa9e4066Sahrens continue; 1305fa9e4066Sahrens } 1306ea8dc4b6Seschrock if (refcount_count(&db->db_holds) == 0) { 1307ea8dc4b6Seschrock ASSERT(db->db_buf); 1308dcbf3bd6SGeorge Wilson dbuf_destroy(db); 1309ea8dc4b6Seschrock continue; 1310ea8dc4b6Seschrock } 1311c717a561Smaybee /* The dbuf is referenced */ 1312fa9e4066Sahrens 1313c717a561Smaybee if (db->db_last_dirty != NULL) { 1314c717a561Smaybee dbuf_dirty_record_t *dr = db->db_last_dirty; 1315c717a561Smaybee 1316c717a561Smaybee if (dr->dr_txg == txg) { 1317ea8dc4b6Seschrock /* 1318c717a561Smaybee * This buffer is "in-use", re-adjust the file 1319c717a561Smaybee * size to reflect that this buffer may 1320c717a561Smaybee * contain new data when we sync. 1321ea8dc4b6Seschrock */ 132206e0070dSMark Shellenbaum if (db->db_blkid != DMU_SPILL_BLKID && 132306e0070dSMark Shellenbaum db->db_blkid > dn->dn_maxblkid) 132444eda4d7Smaybee dn->dn_maxblkid = db->db_blkid; 1325c717a561Smaybee dbuf_unoverride(dr); 1326c717a561Smaybee } else { 1327c717a561Smaybee /* 1328c717a561Smaybee * This dbuf is not dirty in the open context. 1329c717a561Smaybee * Either uncache it (if its not referenced in 1330c717a561Smaybee * the open context) or reset its contents to 1331c717a561Smaybee * empty. 1332c717a561Smaybee */ 1333c717a561Smaybee dbuf_fix_old_data(db, txg); 133444eda4d7Smaybee } 1335c717a561Smaybee } 1336c717a561Smaybee /* clear the contents if its cached */ 1337ea8dc4b6Seschrock if (db->db_state == DB_CACHED) { 1338ea8dc4b6Seschrock ASSERT(db->db.db_data != NULL); 1339fa9e4066Sahrens arc_release(db->db_buf, db); 1340fa9e4066Sahrens bzero(db->db.db_data, db->db.db_size); 13416b4acc8bSahrens arc_buf_freeze(db->db_buf); 1342fa9e4066Sahrens } 1343ea8dc4b6Seschrock 1344fa9e4066Sahrens mutex_exit(&db->db_mtx); 1345fa9e4066Sahrens } 1346fa9e4066Sahrens mutex_exit(&dn->dn_dbufs_mtx); 1347fa9e4066Sahrens } 1348fa9e4066Sahrens 1349fa9e4066Sahrens static int 13501934e92fSmaybee dbuf_block_freeable(dmu_buf_impl_t *db) 1351fa9e4066Sahrens { 1352fa9e4066Sahrens dsl_dataset_t *ds = db->db_objset->os_dsl_dataset; 1353fa9e4066Sahrens uint64_t birth_txg = 0; 1354fa9e4066Sahrens 1355fa9e4066Sahrens /* 1356fa9e4066Sahrens * We don't need any locking to protect db_blkptr: 1357c717a561Smaybee * If it's syncing, then db_last_dirty will be set 1358c717a561Smaybee * so we'll ignore db_blkptr. 135943466aaeSMax Grossman * 136043466aaeSMax Grossman * This logic ensures that only block births for 136143466aaeSMax Grossman * filled blocks are considered. 1362fa9e4066Sahrens */ 1363c717a561Smaybee ASSERT(MUTEX_HELD(&db->db_mtx)); 136443466aaeSMax Grossman if (db->db_last_dirty && (db->db_blkptr == NULL || 136543466aaeSMax Grossman !BP_IS_HOLE(db->db_blkptr))) { 1366c717a561Smaybee birth_txg = db->db_last_dirty->dr_txg; 136743466aaeSMax Grossman } else if (db->db_blkptr != NULL && !BP_IS_HOLE(db->db_blkptr)) { 1368fa9e4066Sahrens birth_txg = db->db_blkptr->blk_birth; 136943466aaeSMax Grossman } 1370fa9e4066Sahrens 1371837b568bSGeorge Wilson /* 137243466aaeSMax Grossman * If this block don't exist or is in a snapshot, it can't be freed. 1373837b568bSGeorge Wilson * Don't pass the bp to dsl_dataset_block_freeable() since we 1374837b568bSGeorge Wilson * are holding the db_mtx lock and might deadlock if we are 1375837b568bSGeorge Wilson * prefetching a dedup-ed block. 1376837b568bSGeorge Wilson */ 137743466aaeSMax Grossman if (birth_txg != 0) 13781934e92fSmaybee return (ds == NULL || 1379837b568bSGeorge Wilson dsl_dataset_block_freeable(ds, NULL, birth_txg)); 1380fa9e4066Sahrens else 138143466aaeSMax Grossman return (B_FALSE); 1382fa9e4066Sahrens } 1383fa9e4066Sahrens 1384fa9e4066Sahrens void 1385fa9e4066Sahrens dbuf_new_size(dmu_buf_impl_t *db, int size, dmu_tx_t *tx) 1386fa9e4066Sahrens { 1387fa9e4066Sahrens arc_buf_t *buf, *obuf; 1388fa9e4066Sahrens int osize = db->db.db_size; 1389ad23a2dbSjohansen arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 1390744947dcSTom Erickson dnode_t *dn; 1391fa9e4066Sahrens 13920a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 1393ea8dc4b6Seschrock 1394744947dcSTom Erickson DB_DNODE_ENTER(db); 1395744947dcSTom Erickson dn = DB_DNODE(db); 1396744947dcSTom Erickson 1397fa9e4066Sahrens /* XXX does *this* func really need the lock? */ 1398744947dcSTom Erickson ASSERT(RW_WRITE_HELD(&dn->dn_struct_rwlock)); 1399fa9e4066Sahrens 1400fa9e4066Sahrens /* 140143466aaeSMax Grossman * This call to dmu_buf_will_dirty() with the dn_struct_rwlock held 1402fa9e4066Sahrens * is OK, because there can be no other references to the db 1403fa9e4066Sahrens * when we are changing its size, so no concurrent DB_FILL can 1404fa9e4066Sahrens * be happening. 1405fa9e4066Sahrens */ 1406ea8dc4b6Seschrock /* 1407ea8dc4b6Seschrock * XXX we should be doing a dbuf_read, checking the return 1408ea8dc4b6Seschrock * value and returning that up to our callers 1409ea8dc4b6Seschrock */ 141043466aaeSMax Grossman dmu_buf_will_dirty(&db->db, tx); 1411fa9e4066Sahrens 1412fa9e4066Sahrens /* create the data buffer for the new block */ 14135602294fSDan Kimmel buf = arc_alloc_buf(dn->dn_objset->os_spa, db, type, size); 1414fa9e4066Sahrens 1415fa9e4066Sahrens /* copy old block data to the new block */ 1416fa9e4066Sahrens obuf = db->db_buf; 1417f65e61c0Sahrens bcopy(obuf->b_data, buf->b_data, MIN(osize, size)); 1418fa9e4066Sahrens /* zero the remainder */ 1419f65e61c0Sahrens if (size > osize) 1420fa9e4066Sahrens bzero((uint8_t *)buf->b_data + osize, size - osize); 1421fa9e4066Sahrens 1422fa9e4066Sahrens mutex_enter(&db->db_mtx); 1423fa9e4066Sahrens dbuf_set_data(db, buf); 1424dcbf3bd6SGeorge Wilson arc_buf_destroy(obuf, db); 1425fa9e4066Sahrens db->db.db_size = size; 1426fa9e4066Sahrens 1427c717a561Smaybee if (db->db_level == 0) { 1428c717a561Smaybee ASSERT3U(db->db_last_dirty->dr_txg, ==, tx->tx_txg); 1429c717a561Smaybee db->db_last_dirty->dt.dl.dr_data = buf; 1430c717a561Smaybee } 1431fa9e4066Sahrens mutex_exit(&db->db_mtx); 1432fa9e4066Sahrens 1433744947dcSTom Erickson dnode_willuse_space(dn, size-osize, tx); 1434744947dcSTom Erickson DB_DNODE_EXIT(db); 1435fa9e4066Sahrens } 1436fa9e4066Sahrens 14373f9d6ad7SLin Ling void 14383f9d6ad7SLin Ling dbuf_release_bp(dmu_buf_impl_t *db) 14393f9d6ad7SLin Ling { 144043466aaeSMax Grossman objset_t *os = db->db_objset; 14413f9d6ad7SLin Ling 14423f9d6ad7SLin Ling ASSERT(dsl_pool_sync_context(dmu_objset_pool(os))); 14433f9d6ad7SLin Ling ASSERT(arc_released(os->os_phys_buf) || 14443f9d6ad7SLin Ling list_link_active(&os->os_dsl_dataset->ds_synced_link)); 14453f9d6ad7SLin Ling ASSERT(db->db_parent == NULL || arc_released(db->db_parent->db_buf)); 14463f9d6ad7SLin Ling 14471b912ec7SGeorge Wilson (void) arc_release(db->db_buf, db); 14483f9d6ad7SLin Ling } 14493f9d6ad7SLin Ling 14500f2e7d03SMatthew Ahrens /* 14510f2e7d03SMatthew Ahrens * We already have a dirty record for this TXG, and we are being 14520f2e7d03SMatthew Ahrens * dirtied again. 14530f2e7d03SMatthew Ahrens */ 14540f2e7d03SMatthew Ahrens static void 14550f2e7d03SMatthew Ahrens dbuf_redirty(dbuf_dirty_record_t *dr) 14560f2e7d03SMatthew Ahrens { 14570f2e7d03SMatthew Ahrens dmu_buf_impl_t *db = dr->dr_dbuf; 14580f2e7d03SMatthew Ahrens 14590f2e7d03SMatthew Ahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 14600f2e7d03SMatthew Ahrens 14610f2e7d03SMatthew Ahrens if (db->db_level == 0 && db->db_blkid != DMU_BONUS_BLKID) { 14620f2e7d03SMatthew Ahrens /* 14630f2e7d03SMatthew Ahrens * If this buffer has already been written out, 14640f2e7d03SMatthew Ahrens * we now need to reset its state. 14650f2e7d03SMatthew Ahrens */ 14660f2e7d03SMatthew Ahrens dbuf_unoverride(dr); 14670f2e7d03SMatthew Ahrens if (db->db.db_object != DMU_META_DNODE_OBJECT && 14680f2e7d03SMatthew Ahrens db->db_state != DB_NOFILL) { 14690f2e7d03SMatthew Ahrens /* Already released on initial dirty, so just thaw. */ 14700f2e7d03SMatthew Ahrens ASSERT(arc_released(db->db_buf)); 14710f2e7d03SMatthew Ahrens arc_buf_thaw(db->db_buf); 14720f2e7d03SMatthew Ahrens } 14730f2e7d03SMatthew Ahrens } 14740f2e7d03SMatthew Ahrens } 14750f2e7d03SMatthew Ahrens 1476c717a561Smaybee dbuf_dirty_record_t * 1477fa9e4066Sahrens dbuf_dirty(dmu_buf_impl_t *db, dmu_tx_t *tx) 1478fa9e4066Sahrens { 1479744947dcSTom Erickson dnode_t *dn; 1480744947dcSTom Erickson objset_t *os; 1481c717a561Smaybee dbuf_dirty_record_t **drp, *dr; 1482fa9e4066Sahrens int drop_struct_lock = FALSE; 1483d3469faaSMark Maybee boolean_t do_free_accounting = B_FALSE; 1484fa9e4066Sahrens int txgoff = tx->tx_txg & TXG_MASK; 1485fa9e4066Sahrens 1486fa9e4066Sahrens ASSERT(tx->tx_txg != 0); 1487fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 14889c9dc39aSek110237 DMU_TX_DIRTY_BUF(tx, db); 1489fa9e4066Sahrens 1490744947dcSTom Erickson DB_DNODE_ENTER(db); 1491744947dcSTom Erickson dn = DB_DNODE(db); 1492fa9e4066Sahrens /* 1493fa9e4066Sahrens * Shouldn't dirty a regular buffer in syncing context. Private 1494fa9e4066Sahrens * objects may be dirtied in syncing context, but only if they 1495fa9e4066Sahrens * were already pre-dirtied in open context. 1496fa9e4066Sahrens */ 1497c166b69dSPaul Dagnelie #ifdef DEBUG 1498c166b69dSPaul Dagnelie if (dn->dn_objset->os_dsl_dataset != NULL) { 1499c166b69dSPaul Dagnelie rrw_enter(&dn->dn_objset->os_dsl_dataset->ds_bp_rwlock, 1500c166b69dSPaul Dagnelie RW_READER, FTAG); 1501c166b69dSPaul Dagnelie } 1502c717a561Smaybee ASSERT(!dmu_tx_is_syncing(tx) || 1503c717a561Smaybee BP_IS_HOLE(dn->dn_objset->os_rootbp) || 150414843421SMatthew Ahrens DMU_OBJECT_IS_SPECIAL(dn->dn_object) || 150514843421SMatthew Ahrens dn->dn_objset->os_dsl_dataset == NULL); 1506c166b69dSPaul Dagnelie if (dn->dn_objset->os_dsl_dataset != NULL) 1507c166b69dSPaul Dagnelie rrw_exit(&dn->dn_objset->os_dsl_dataset->ds_bp_rwlock, FTAG); 1508c166b69dSPaul Dagnelie #endif 1509fa9e4066Sahrens /* 1510fa9e4066Sahrens * We make this assert for private objects as well, but after we 1511fa9e4066Sahrens * check if we're already dirty. They are allowed to re-dirty 1512fa9e4066Sahrens * in syncing context. 1513fa9e4066Sahrens */ 1514ea8dc4b6Seschrock ASSERT(dn->dn_object == DMU_META_DNODE_OBJECT || 1515c717a561Smaybee dn->dn_dirtyctx == DN_UNDIRTIED || dn->dn_dirtyctx == 1516fa9e4066Sahrens (dmu_tx_is_syncing(tx) ? DN_DIRTY_SYNC : DN_DIRTY_OPEN)); 1517fa9e4066Sahrens 1518fa9e4066Sahrens mutex_enter(&db->db_mtx); 1519fa9e4066Sahrens /* 1520c717a561Smaybee * XXX make this true for indirects too? The problem is that 1521c717a561Smaybee * transactions created with dmu_tx_create_assigned() from 1522c717a561Smaybee * syncing context don't bother holding ahead. 1523fa9e4066Sahrens */ 1524c717a561Smaybee ASSERT(db->db_level != 0 || 152582c9918fSTim Haley db->db_state == DB_CACHED || db->db_state == DB_FILL || 152682c9918fSTim Haley db->db_state == DB_NOFILL); 1527fa9e4066Sahrens 1528fa9e4066Sahrens mutex_enter(&dn->dn_mtx); 1529fa9e4066Sahrens /* 1530fa9e4066Sahrens * Don't set dirtyctx to SYNC if we're just modifying this as we 1531fa9e4066Sahrens * initialize the objset. 1532fa9e4066Sahrens */ 1533c166b69dSPaul Dagnelie if (dn->dn_dirtyctx == DN_UNDIRTIED) { 1534c166b69dSPaul Dagnelie if (dn->dn_objset->os_dsl_dataset != NULL) { 1535c166b69dSPaul Dagnelie rrw_enter(&dn->dn_objset->os_dsl_dataset->ds_bp_rwlock, 1536c166b69dSPaul Dagnelie RW_READER, FTAG); 1537c166b69dSPaul Dagnelie } 1538c166b69dSPaul Dagnelie if (!BP_IS_HOLE(dn->dn_objset->os_rootbp)) { 1539c166b69dSPaul Dagnelie dn->dn_dirtyctx = (dmu_tx_is_syncing(tx) ? 1540c166b69dSPaul Dagnelie DN_DIRTY_SYNC : DN_DIRTY_OPEN); 1541fa9e4066Sahrens ASSERT(dn->dn_dirtyctx_firstset == NULL); 1542fa9e4066Sahrens dn->dn_dirtyctx_firstset = kmem_alloc(1, KM_SLEEP); 1543fa9e4066Sahrens } 1544c166b69dSPaul Dagnelie if (dn->dn_objset->os_dsl_dataset != NULL) { 1545c166b69dSPaul Dagnelie rrw_exit(&dn->dn_objset->os_dsl_dataset->ds_bp_rwlock, 1546c166b69dSPaul Dagnelie FTAG); 1547c166b69dSPaul Dagnelie } 1548c166b69dSPaul Dagnelie } 1549fa9e4066Sahrens mutex_exit(&dn->dn_mtx); 1550fa9e4066Sahrens 15510a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) 15520a586ceaSMark Shellenbaum dn->dn_have_spill = B_TRUE; 15530a586ceaSMark Shellenbaum 1554fa9e4066Sahrens /* 1555fa9e4066Sahrens * If this buffer is already dirty, we're done. 1556fa9e4066Sahrens */ 1557c717a561Smaybee drp = &db->db_last_dirty; 1558c717a561Smaybee ASSERT(*drp == NULL || (*drp)->dr_txg <= tx->tx_txg || 1559c717a561Smaybee db->db.db_object == DMU_META_DNODE_OBJECT); 15607e2186e3Sbonwick while ((dr = *drp) != NULL && dr->dr_txg > tx->tx_txg) 15617e2186e3Sbonwick drp = &dr->dr_next; 15627e2186e3Sbonwick if (dr && dr->dr_txg == tx->tx_txg) { 1563744947dcSTom Erickson DB_DNODE_EXIT(db); 1564744947dcSTom Erickson 15650f2e7d03SMatthew Ahrens dbuf_redirty(dr); 1566fa9e4066Sahrens mutex_exit(&db->db_mtx); 15677e2186e3Sbonwick return (dr); 1568fa9e4066Sahrens } 1569fa9e4066Sahrens 1570fa9e4066Sahrens /* 1571fa9e4066Sahrens * Only valid if not already dirty. 1572fa9e4066Sahrens */ 157314843421SMatthew Ahrens ASSERT(dn->dn_object == 0 || 157414843421SMatthew Ahrens dn->dn_dirtyctx == DN_UNDIRTIED || dn->dn_dirtyctx == 1575fa9e4066Sahrens (dmu_tx_is_syncing(tx) ? DN_DIRTY_SYNC : DN_DIRTY_OPEN)); 1576fa9e4066Sahrens 1577fa9e4066Sahrens ASSERT3U(dn->dn_nlevels, >, db->db_level); 1578fa9e4066Sahrens ASSERT((dn->dn_phys->dn_nlevels == 0 && db->db_level == 0) || 1579fa9e4066Sahrens dn->dn_phys->dn_nlevels > db->db_level || 1580fa9e4066Sahrens dn->dn_next_nlevels[txgoff] > db->db_level || 1581fa9e4066Sahrens dn->dn_next_nlevels[(tx->tx_txg-1) & TXG_MASK] > db->db_level || 1582fa9e4066Sahrens dn->dn_next_nlevels[(tx->tx_txg-2) & TXG_MASK] > db->db_level); 1583fa9e4066Sahrens 1584fa9e4066Sahrens /* 1585fa9e4066Sahrens * We should only be dirtying in syncing context if it's the 158614843421SMatthew Ahrens * mos or we're initializing the os or it's a special object. 158714843421SMatthew Ahrens * However, we are allowed to dirty in syncing context provided 158814843421SMatthew Ahrens * we already dirtied it in open context. Hence we must make 158914843421SMatthew Ahrens * this assertion only if we're not already dirty. 1590fa9e4066Sahrens */ 1591744947dcSTom Erickson os = dn->dn_objset; 1592c166b69dSPaul Dagnelie #ifdef DEBUG 1593c166b69dSPaul Dagnelie if (dn->dn_objset->os_dsl_dataset != NULL) 1594c166b69dSPaul Dagnelie rrw_enter(&os->os_dsl_dataset->ds_bp_rwlock, RW_READER, FTAG); 159514843421SMatthew Ahrens ASSERT(!dmu_tx_is_syncing(tx) || DMU_OBJECT_IS_SPECIAL(dn->dn_object) || 159614843421SMatthew Ahrens os->os_dsl_dataset == NULL || BP_IS_HOLE(os->os_rootbp)); 1597c166b69dSPaul Dagnelie if (dn->dn_objset->os_dsl_dataset != NULL) 1598c166b69dSPaul Dagnelie rrw_exit(&os->os_dsl_dataset->ds_bp_rwlock, FTAG); 1599c166b69dSPaul Dagnelie #endif 1600fa9e4066Sahrens ASSERT(db->db.db_size != 0); 1601fa9e4066Sahrens 1602fa9e4066Sahrens dprintf_dbuf(db, "size=%llx\n", (u_longlong_t)db->db.db_size); 1603fa9e4066Sahrens 16040a586ceaSMark Shellenbaum if (db->db_blkid != DMU_BONUS_BLKID) { 16051934e92fSmaybee /* 16061934e92fSmaybee * Update the accounting. 1607d3469faaSMark Maybee * Note: we delay "free accounting" until after we drop 1608d3469faaSMark Maybee * the db_mtx. This keeps us from grabbing other locks 1609b24ab676SJeff Bonwick * (and possibly deadlocking) in bp_get_dsize() while 1610d3469faaSMark Maybee * also holding the db_mtx. 16111934e92fSmaybee */ 16121934e92fSmaybee dnode_willuse_space(dn, db->db.db_size, tx); 1613d3469faaSMark Maybee do_free_accounting = dbuf_block_freeable(db); 16141934e92fSmaybee } 16151934e92fSmaybee 1616ea8dc4b6Seschrock /* 1617ea8dc4b6Seschrock * If this buffer is dirty in an old transaction group we need 1618ea8dc4b6Seschrock * to make a copy of it so that the changes we make in this 1619ea8dc4b6Seschrock * transaction group won't leak out when we sync the older txg. 1620ea8dc4b6Seschrock */ 1621c717a561Smaybee dr = kmem_zalloc(sizeof (dbuf_dirty_record_t), KM_SLEEP); 1622c717a561Smaybee if (db->db_level == 0) { 1623c717a561Smaybee void *data_old = db->db_buf; 1624c717a561Smaybee 162582c9918fSTim Haley if (db->db_state != DB_NOFILL) { 16260a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 1627c717a561Smaybee dbuf_fix_old_data(db, tx->tx_txg); 1628c717a561Smaybee data_old = db->db.db_data; 1629c717a561Smaybee } else if (db->db.db_object != DMU_META_DNODE_OBJECT) { 1630fa9e4066Sahrens /* 163182c9918fSTim Haley * Release the data buffer from the cache so 163282c9918fSTim Haley * that we can modify it without impacting 163382c9918fSTim Haley * possible other users of this cached data 163482c9918fSTim Haley * block. Note that indirect blocks and 163582c9918fSTim Haley * private objects are not released until the 163682c9918fSTim Haley * syncing state (since they are only modified 163782c9918fSTim Haley * then). 1638fa9e4066Sahrens */ 1639fa9e4066Sahrens arc_release(db->db_buf, db); 1640fa9e4066Sahrens dbuf_fix_old_data(db, tx->tx_txg); 1641c717a561Smaybee data_old = db->db_buf; 1642fa9e4066Sahrens } 1643c717a561Smaybee ASSERT(data_old != NULL); 164482c9918fSTim Haley } 1645c717a561Smaybee dr->dt.dl.dr_data = data_old; 1646c717a561Smaybee } else { 1647c717a561Smaybee mutex_init(&dr->dt.di.dr_mtx, NULL, MUTEX_DEFAULT, NULL); 1648c717a561Smaybee list_create(&dr->dt.di.dr_children, 1649c717a561Smaybee sizeof (dbuf_dirty_record_t), 1650c717a561Smaybee offsetof(dbuf_dirty_record_t, dr_dirty_node)); 1651fa9e4066Sahrens } 165269962b56SMatthew Ahrens if (db->db_blkid != DMU_BONUS_BLKID && os->os_dsl_dataset != NULL) 165369962b56SMatthew Ahrens dr->dr_accounted = db->db.db_size; 1654c717a561Smaybee dr->dr_dbuf = db; 1655c717a561Smaybee dr->dr_txg = tx->tx_txg; 1656c717a561Smaybee dr->dr_next = *drp; 1657c717a561Smaybee *drp = dr; 1658fa9e4066Sahrens 1659fa9e4066Sahrens /* 1660fa9e4066Sahrens * We could have been freed_in_flight between the dbuf_noread 1661fa9e4066Sahrens * and dbuf_dirty. We win, as though the dbuf_noread() had 1662fa9e4066Sahrens * happened after the free. 1663fa9e4066Sahrens */ 16640a586ceaSMark Shellenbaum if (db->db_level == 0 && db->db_blkid != DMU_BONUS_BLKID && 16650a586ceaSMark Shellenbaum db->db_blkid != DMU_SPILL_BLKID) { 1666c717a561Smaybee mutex_enter(&dn->dn_mtx); 1667bf16b11eSMatthew Ahrens if (dn->dn_free_ranges[txgoff] != NULL) { 1668bf16b11eSMatthew Ahrens range_tree_clear(dn->dn_free_ranges[txgoff], 1669bf16b11eSMatthew Ahrens db->db_blkid, 1); 1670bf16b11eSMatthew Ahrens } 1671fa9e4066Sahrens mutex_exit(&dn->dn_mtx); 1672c717a561Smaybee db->db_freed_in_flight = FALSE; 1673c717a561Smaybee } 1674fa9e4066Sahrens 1675fa9e4066Sahrens /* 1676fa9e4066Sahrens * This buffer is now part of this txg 1677fa9e4066Sahrens */ 1678fa9e4066Sahrens dbuf_add_ref(db, (void *)(uintptr_t)tx->tx_txg); 1679fa9e4066Sahrens db->db_dirtycnt += 1; 1680fa9e4066Sahrens ASSERT3U(db->db_dirtycnt, <=, 3); 1681fa9e4066Sahrens 1682fa9e4066Sahrens mutex_exit(&db->db_mtx); 1683fa9e4066Sahrens 16840a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID || 16850a586ceaSMark Shellenbaum db->db_blkid == DMU_SPILL_BLKID) { 1686c717a561Smaybee mutex_enter(&dn->dn_mtx); 1687c717a561Smaybee ASSERT(!list_link_active(&dr->dr_dirty_node)); 1688c717a561Smaybee list_insert_tail(&dn->dn_dirty_records[txgoff], dr); 1689c717a561Smaybee mutex_exit(&dn->dn_mtx); 1690fa9e4066Sahrens dnode_setdirty(dn, tx); 1691744947dcSTom Erickson DB_DNODE_EXIT(db); 1692c717a561Smaybee return (dr); 169392654925SMatthew Ahrens } 169492654925SMatthew Ahrens 169592654925SMatthew Ahrens /* 169692654925SMatthew Ahrens * The dn_struct_rwlock prevents db_blkptr from changing 169792654925SMatthew Ahrens * due to a write from syncing context completing 169892654925SMatthew Ahrens * while we are running, so we want to acquire it before 169992654925SMatthew Ahrens * looking at db_blkptr. 170092654925SMatthew Ahrens */ 170192654925SMatthew Ahrens if (!RW_WRITE_HELD(&dn->dn_struct_rwlock)) { 170292654925SMatthew Ahrens rw_enter(&dn->dn_struct_rwlock, RW_READER); 170392654925SMatthew Ahrens drop_struct_lock = TRUE; 170492654925SMatthew Ahrens } 170592654925SMatthew Ahrens 170692654925SMatthew Ahrens if (do_free_accounting) { 1707d3469faaSMark Maybee blkptr_t *bp = db->db_blkptr; 1708d3469faaSMark Maybee int64_t willfree = (bp && !BP_IS_HOLE(bp)) ? 1709b24ab676SJeff Bonwick bp_get_dsize(os->os_spa, bp) : db->db.db_size; 1710d3469faaSMark Maybee /* 1711d3469faaSMark Maybee * This is only a guess -- if the dbuf is dirty 1712d3469faaSMark Maybee * in a previous txg, we don't know how much 1713d3469faaSMark Maybee * space it will use on disk yet. We should 1714d3469faaSMark Maybee * really have the struct_rwlock to access 1715d3469faaSMark Maybee * db_blkptr, but since this is just a guess, 1716d3469faaSMark Maybee * it's OK if we get an odd answer. 1717d3469faaSMark Maybee */ 1718837b568bSGeorge Wilson ddt_prefetch(os->os_spa, bp); 1719d3469faaSMark Maybee dnode_willuse_space(dn, -willfree, tx); 1720fa9e4066Sahrens } 1721fa9e4066Sahrens 17228346f03fSJonathan W Adams if (db->db_level == 0) { 17238346f03fSJonathan W Adams dnode_new_blkid(dn, db->db_blkid, tx, drop_struct_lock); 17248346f03fSJonathan W Adams ASSERT(dn->dn_maxblkid >= db->db_blkid); 17258346f03fSJonathan W Adams } 17268346f03fSJonathan W Adams 172744eda4d7Smaybee if (db->db_level+1 < dn->dn_nlevels) { 1728c717a561Smaybee dmu_buf_impl_t *parent = db->db_parent; 1729c717a561Smaybee dbuf_dirty_record_t *di; 1730c717a561Smaybee int parent_held = FALSE; 1731c717a561Smaybee 1732c717a561Smaybee if (db->db_parent == NULL || db->db_parent == dn->dn_dbuf) { 1733fa9e4066Sahrens int epbs = dn->dn_indblkshift - SPA_BLKPTRSHIFT; 1734c717a561Smaybee 1735fa9e4066Sahrens parent = dbuf_hold_level(dn, db->db_level+1, 1736fa9e4066Sahrens db->db_blkid >> epbs, FTAG); 173701025c89SJohn Harres ASSERT(parent != NULL); 1738c717a561Smaybee parent_held = TRUE; 1739c717a561Smaybee } 1740fa9e4066Sahrens if (drop_struct_lock) 1741fa9e4066Sahrens rw_exit(&dn->dn_struct_rwlock); 1742c717a561Smaybee ASSERT3U(db->db_level+1, ==, parent->db_level); 1743c717a561Smaybee di = dbuf_dirty(parent, tx); 1744c717a561Smaybee if (parent_held) 1745ea8dc4b6Seschrock dbuf_rele(parent, FTAG); 1746c717a561Smaybee 1747c717a561Smaybee mutex_enter(&db->db_mtx); 174869962b56SMatthew Ahrens /* 174969962b56SMatthew Ahrens * Since we've dropped the mutex, it's possible that 175069962b56SMatthew Ahrens * dbuf_undirty() might have changed this out from under us. 175169962b56SMatthew Ahrens */ 1752c717a561Smaybee if (db->db_last_dirty == dr || 1753c717a561Smaybee dn->dn_object == DMU_META_DNODE_OBJECT) { 1754c717a561Smaybee mutex_enter(&di->dt.di.dr_mtx); 1755c717a561Smaybee ASSERT3U(di->dr_txg, ==, tx->tx_txg); 1756c717a561Smaybee ASSERT(!list_link_active(&dr->dr_dirty_node)); 1757c717a561Smaybee list_insert_tail(&di->dt.di.dr_children, dr); 1758c717a561Smaybee mutex_exit(&di->dt.di.dr_mtx); 1759c717a561Smaybee dr->dr_parent = di; 1760c717a561Smaybee } 1761c717a561Smaybee mutex_exit(&db->db_mtx); 1762fa9e4066Sahrens } else { 1763c717a561Smaybee ASSERT(db->db_level+1 == dn->dn_nlevels); 1764c717a561Smaybee ASSERT(db->db_blkid < dn->dn_nblkptr); 1765744947dcSTom Erickson ASSERT(db->db_parent == NULL || db->db_parent == dn->dn_dbuf); 1766c717a561Smaybee mutex_enter(&dn->dn_mtx); 1767c717a561Smaybee ASSERT(!list_link_active(&dr->dr_dirty_node)); 1768c717a561Smaybee list_insert_tail(&dn->dn_dirty_records[txgoff], dr); 1769c717a561Smaybee mutex_exit(&dn->dn_mtx); 1770fa9e4066Sahrens if (drop_struct_lock) 1771fa9e4066Sahrens rw_exit(&dn->dn_struct_rwlock); 1772fa9e4066Sahrens } 1773fa9e4066Sahrens 1774fa9e4066Sahrens dnode_setdirty(dn, tx); 1775744947dcSTom Erickson DB_DNODE_EXIT(db); 1776c717a561Smaybee return (dr); 1777fa9e4066Sahrens } 1778fa9e4066Sahrens 17793b2aab18SMatthew Ahrens /* 17803e30c24aSWill Andrews * Undirty a buffer in the transaction group referenced by the given 17813e30c24aSWill Andrews * transaction. Return whether this evicted the dbuf. 17823b2aab18SMatthew Ahrens */ 17833b2aab18SMatthew Ahrens static boolean_t 1784fa9e4066Sahrens dbuf_undirty(dmu_buf_impl_t *db, dmu_tx_t *tx) 1785fa9e4066Sahrens { 1786744947dcSTom Erickson dnode_t *dn; 1787c717a561Smaybee uint64_t txg = tx->tx_txg; 178817f17c2dSbonwick dbuf_dirty_record_t *dr, **drp; 1789fa9e4066Sahrens 1790c717a561Smaybee ASSERT(txg != 0); 179146e1baa6SMatthew Ahrens 179246e1baa6SMatthew Ahrens /* 179346e1baa6SMatthew Ahrens * Due to our use of dn_nlevels below, this can only be called 179446e1baa6SMatthew Ahrens * in open context, unless we are operating on the MOS. 179546e1baa6SMatthew Ahrens * From syncing context, dn_nlevels may be different from the 179646e1baa6SMatthew Ahrens * dn_nlevels used when dbuf was dirtied. 179746e1baa6SMatthew Ahrens */ 179846e1baa6SMatthew Ahrens ASSERT(db->db_objset == 179946e1baa6SMatthew Ahrens dmu_objset_pool(db->db_objset)->dp_meta_objset || 180046e1baa6SMatthew Ahrens txg != spa_syncing_txg(dmu_objset_spa(db->db_objset))); 18010a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 18023b2aab18SMatthew Ahrens ASSERT0(db->db_level); 18033b2aab18SMatthew Ahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 1804fa9e4066Sahrens 1805fa9e4066Sahrens /* 1806fa9e4066Sahrens * If this buffer is not dirty, we're done. 1807fa9e4066Sahrens */ 180817f17c2dSbonwick for (drp = &db->db_last_dirty; (dr = *drp) != NULL; drp = &dr->dr_next) 1809c717a561Smaybee if (dr->dr_txg <= txg) 1810c717a561Smaybee break; 18113b2aab18SMatthew Ahrens if (dr == NULL || dr->dr_txg < txg) 18123b2aab18SMatthew Ahrens return (B_FALSE); 1813c717a561Smaybee ASSERT(dr->dr_txg == txg); 1814b24ab676SJeff Bonwick ASSERT(dr->dr_dbuf == db); 1815fa9e4066Sahrens 1816744947dcSTom Erickson DB_DNODE_ENTER(db); 1817744947dcSTom Erickson dn = DB_DNODE(db); 1818744947dcSTom Erickson 1819fa9e4066Sahrens dprintf_dbuf(db, "size=%llx\n", (u_longlong_t)db->db.db_size); 1820fa9e4066Sahrens 1821fa9e4066Sahrens ASSERT(db->db.db_size != 0); 1822fa9e4066Sahrens 182346e1baa6SMatthew Ahrens dsl_pool_undirty_space(dmu_objset_pool(dn->dn_objset), 182446e1baa6SMatthew Ahrens dr->dr_accounted, txg); 1825fa9e4066Sahrens 182617f17c2dSbonwick *drp = dr->dr_next; 1827c717a561Smaybee 18283f2366c2SGordon Ross /* 18293f2366c2SGordon Ross * Note that there are three places in dbuf_dirty() 18303f2366c2SGordon Ross * where this dirty record may be put on a list. 18313f2366c2SGordon Ross * Make sure to do a list_remove corresponding to 18323f2366c2SGordon Ross * every one of those list_insert calls. 18333f2366c2SGordon Ross */ 1834c717a561Smaybee if (dr->dr_parent) { 1835c717a561Smaybee mutex_enter(&dr->dr_parent->dt.di.dr_mtx); 1836c717a561Smaybee list_remove(&dr->dr_parent->dt.di.dr_children, dr); 1837c717a561Smaybee mutex_exit(&dr->dr_parent->dt.di.dr_mtx); 18383f2366c2SGordon Ross } else if (db->db_blkid == DMU_SPILL_BLKID || 18393f2366c2SGordon Ross db->db_level + 1 == dn->dn_nlevels) { 1840cdb0ab79Smaybee ASSERT(db->db_blkptr == NULL || db->db_parent == dn->dn_dbuf); 1841fa9e4066Sahrens mutex_enter(&dn->dn_mtx); 1842c717a561Smaybee list_remove(&dn->dn_dirty_records[txg & TXG_MASK], dr); 1843fa9e4066Sahrens mutex_exit(&dn->dn_mtx); 1844c717a561Smaybee } 1845744947dcSTom Erickson DB_DNODE_EXIT(db); 1846c717a561Smaybee 184782c9918fSTim Haley if (db->db_state != DB_NOFILL) { 1848c717a561Smaybee dbuf_unoverride(dr); 1849c717a561Smaybee 1850c717a561Smaybee ASSERT(db->db_buf != NULL); 1851c717a561Smaybee ASSERT(dr->dt.dl.dr_data != NULL); 1852c717a561Smaybee if (dr->dt.dl.dr_data != db->db_buf) 1853dcbf3bd6SGeorge Wilson arc_buf_destroy(dr->dt.dl.dr_data, db); 1854c717a561Smaybee } 1855d2b3cbbdSJorgen Lundman 1856c717a561Smaybee kmem_free(dr, sizeof (dbuf_dirty_record_t)); 1857fa9e4066Sahrens 1858fa9e4066Sahrens ASSERT(db->db_dirtycnt > 0); 1859fa9e4066Sahrens db->db_dirtycnt -= 1; 1860fa9e4066Sahrens 1861c717a561Smaybee if (refcount_remove(&db->db_holds, (void *)(uintptr_t)txg) == 0) { 1862dcbf3bd6SGeorge Wilson ASSERT(db->db_state == DB_NOFILL || arc_released(db->db_buf)); 1863dcbf3bd6SGeorge Wilson dbuf_destroy(db); 18643b2aab18SMatthew Ahrens return (B_TRUE); 1865fa9e4066Sahrens } 1866fa9e4066Sahrens 18673b2aab18SMatthew Ahrens return (B_FALSE); 1868fa9e4066Sahrens } 1869fa9e4066Sahrens 1870fa9e4066Sahrens void 187143466aaeSMax Grossman dmu_buf_will_dirty(dmu_buf_t *db_fake, dmu_tx_t *tx) 1872fa9e4066Sahrens { 187343466aaeSMax Grossman dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 18741ab7f2deSmaybee int rf = DB_RF_MUST_SUCCEED | DB_RF_NOPREFETCH; 1875fa9e4066Sahrens 1876fa9e4066Sahrens ASSERT(tx->tx_txg != 0); 1877fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 1878fa9e4066Sahrens 18790f2e7d03SMatthew Ahrens /* 18800f2e7d03SMatthew Ahrens * Quick check for dirtyness. For already dirty blocks, this 18810f2e7d03SMatthew Ahrens * reduces runtime of this function by >90%, and overall performance 18820f2e7d03SMatthew Ahrens * by 50% for some workloads (e.g. file deletion with indirect blocks 18830f2e7d03SMatthew Ahrens * cached). 18840f2e7d03SMatthew Ahrens */ 18850f2e7d03SMatthew Ahrens mutex_enter(&db->db_mtx); 18860f2e7d03SMatthew Ahrens dbuf_dirty_record_t *dr; 18870f2e7d03SMatthew Ahrens for (dr = db->db_last_dirty; 18880f2e7d03SMatthew Ahrens dr != NULL && dr->dr_txg >= tx->tx_txg; dr = dr->dr_next) { 18890f2e7d03SMatthew Ahrens /* 18900f2e7d03SMatthew Ahrens * It's possible that it is already dirty but not cached, 18910f2e7d03SMatthew Ahrens * because there are some calls to dbuf_dirty() that don't 18920f2e7d03SMatthew Ahrens * go through dmu_buf_will_dirty(). 18930f2e7d03SMatthew Ahrens */ 18940f2e7d03SMatthew Ahrens if (dr->dr_txg == tx->tx_txg && db->db_state == DB_CACHED) { 18950f2e7d03SMatthew Ahrens /* This dbuf is already dirty and cached. */ 18960f2e7d03SMatthew Ahrens dbuf_redirty(dr); 18970f2e7d03SMatthew Ahrens mutex_exit(&db->db_mtx); 18980f2e7d03SMatthew Ahrens return; 18990f2e7d03SMatthew Ahrens } 19000f2e7d03SMatthew Ahrens } 19010f2e7d03SMatthew Ahrens mutex_exit(&db->db_mtx); 19020f2e7d03SMatthew Ahrens 1903744947dcSTom Erickson DB_DNODE_ENTER(db); 1904744947dcSTom Erickson if (RW_WRITE_HELD(&DB_DNODE(db)->dn_struct_rwlock)) 1905fa9e4066Sahrens rf |= DB_RF_HAVESTRUCT; 1906744947dcSTom Erickson DB_DNODE_EXIT(db); 1907ea8dc4b6Seschrock (void) dbuf_read(db, NULL, rf); 1908c717a561Smaybee (void) dbuf_dirty(db, tx); 1909fa9e4066Sahrens } 1910fa9e4066Sahrens 1911fa9e4066Sahrens void 191282c9918fSTim Haley dmu_buf_will_not_fill(dmu_buf_t *db_fake, dmu_tx_t *tx) 191382c9918fSTim Haley { 191482c9918fSTim Haley dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 191582c9918fSTim Haley 191682c9918fSTim Haley db->db_state = DB_NOFILL; 191782c9918fSTim Haley 191882c9918fSTim Haley dmu_buf_will_fill(db_fake, tx); 191982c9918fSTim Haley } 192082c9918fSTim Haley 192182c9918fSTim Haley void 1922ea8dc4b6Seschrock dmu_buf_will_fill(dmu_buf_t *db_fake, dmu_tx_t *tx) 1923fa9e4066Sahrens { 1924ea8dc4b6Seschrock dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 1925ea8dc4b6Seschrock 19260a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 1927fa9e4066Sahrens ASSERT(tx->tx_txg != 0); 1928fa9e4066Sahrens ASSERT(db->db_level == 0); 1929fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 1930fa9e4066Sahrens 1931ea8dc4b6Seschrock ASSERT(db->db.db_object != DMU_META_DNODE_OBJECT || 1932fa9e4066Sahrens dmu_tx_private_ok(tx)); 1933fa9e4066Sahrens 1934fa9e4066Sahrens dbuf_noread(db); 1935c717a561Smaybee (void) dbuf_dirty(db, tx); 1936fa9e4066Sahrens } 1937fa9e4066Sahrens 1938fa9e4066Sahrens #pragma weak dmu_buf_fill_done = dbuf_fill_done 1939fa9e4066Sahrens /* ARGSUSED */ 1940fa9e4066Sahrens void 1941fa9e4066Sahrens dbuf_fill_done(dmu_buf_impl_t *db, dmu_tx_t *tx) 1942fa9e4066Sahrens { 1943fa9e4066Sahrens mutex_enter(&db->db_mtx); 19449c9dc39aSek110237 DBUF_VERIFY(db); 1945fa9e4066Sahrens 1946fa9e4066Sahrens if (db->db_state == DB_FILL) { 1947c717a561Smaybee if (db->db_level == 0 && db->db_freed_in_flight) { 19480a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 1949fa9e4066Sahrens /* we were freed while filling */ 1950fa9e4066Sahrens /* XXX dbuf_undirty? */ 1951fa9e4066Sahrens bzero(db->db.db_data, db->db.db_size); 1952c717a561Smaybee db->db_freed_in_flight = FALSE; 1953fa9e4066Sahrens } 1954fa9e4066Sahrens db->db_state = DB_CACHED; 1955fa9e4066Sahrens cv_broadcast(&db->db_changed); 1956fa9e4066Sahrens } 1957fa9e4066Sahrens mutex_exit(&db->db_mtx); 1958fa9e4066Sahrens } 1959fa9e4066Sahrens 19605d7b4d43SMatthew Ahrens void 19615d7b4d43SMatthew Ahrens dmu_buf_write_embedded(dmu_buf_t *dbuf, void *data, 19625d7b4d43SMatthew Ahrens bp_embedded_type_t etype, enum zio_compress comp, 19635d7b4d43SMatthew Ahrens int uncompressed_size, int compressed_size, int byteorder, 19645d7b4d43SMatthew Ahrens dmu_tx_t *tx) 19655d7b4d43SMatthew Ahrens { 19665d7b4d43SMatthew Ahrens dmu_buf_impl_t *db = (dmu_buf_impl_t *)dbuf; 19675d7b4d43SMatthew Ahrens struct dirty_leaf *dl; 19685d7b4d43SMatthew Ahrens dmu_object_type_t type; 19695d7b4d43SMatthew Ahrens 1970ca0cc391SMatthew Ahrens if (etype == BP_EMBEDDED_TYPE_DATA) { 1971ca0cc391SMatthew Ahrens ASSERT(spa_feature_is_active(dmu_objset_spa(db->db_objset), 1972ca0cc391SMatthew Ahrens SPA_FEATURE_EMBEDDED_DATA)); 1973ca0cc391SMatthew Ahrens } 1974ca0cc391SMatthew Ahrens 19755d7b4d43SMatthew Ahrens DB_DNODE_ENTER(db); 19765d7b4d43SMatthew Ahrens type = DB_DNODE(db)->dn_type; 19775d7b4d43SMatthew Ahrens DB_DNODE_EXIT(db); 19785d7b4d43SMatthew Ahrens 19795d7b4d43SMatthew Ahrens ASSERT0(db->db_level); 19805d7b4d43SMatthew Ahrens ASSERT(db->db_blkid != DMU_BONUS_BLKID); 19815d7b4d43SMatthew Ahrens 19825d7b4d43SMatthew Ahrens dmu_buf_will_not_fill(dbuf, tx); 19835d7b4d43SMatthew Ahrens 19845d7b4d43SMatthew Ahrens ASSERT3U(db->db_last_dirty->dr_txg, ==, tx->tx_txg); 19855d7b4d43SMatthew Ahrens dl = &db->db_last_dirty->dt.dl; 19865d7b4d43SMatthew Ahrens encode_embedded_bp_compressed(&dl->dr_overridden_by, 19875d7b4d43SMatthew Ahrens data, comp, uncompressed_size, compressed_size); 19885d7b4d43SMatthew Ahrens BPE_SET_ETYPE(&dl->dr_overridden_by, etype); 19895d7b4d43SMatthew Ahrens BP_SET_TYPE(&dl->dr_overridden_by, type); 19905d7b4d43SMatthew Ahrens BP_SET_LEVEL(&dl->dr_overridden_by, 0); 19915d7b4d43SMatthew Ahrens BP_SET_BYTEORDER(&dl->dr_overridden_by, byteorder); 19925d7b4d43SMatthew Ahrens 19935d7b4d43SMatthew Ahrens dl->dr_override_state = DR_OVERRIDDEN; 19945d7b4d43SMatthew Ahrens dl->dr_overridden_by.blk_birth = db->db_last_dirty->dr_txg; 19955d7b4d43SMatthew Ahrens } 19965d7b4d43SMatthew Ahrens 1997ea8dc4b6Seschrock /* 19982fdbea25SAleksandr Guzovskiy * Directly assign a provided arc buf to a given dbuf if it's not referenced 19992fdbea25SAleksandr Guzovskiy * by anybody except our caller. Otherwise copy arcbuf's contents to dbuf. 20002fdbea25SAleksandr Guzovskiy */ 20012fdbea25SAleksandr Guzovskiy void 20022fdbea25SAleksandr Guzovskiy dbuf_assign_arcbuf(dmu_buf_impl_t *db, arc_buf_t *buf, dmu_tx_t *tx) 20032fdbea25SAleksandr Guzovskiy { 20042fdbea25SAleksandr Guzovskiy ASSERT(!refcount_is_zero(&db->db_holds)); 20050a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 20062fdbea25SAleksandr Guzovskiy ASSERT(db->db_level == 0); 20075602294fSDan Kimmel ASSERT3U(dbuf_is_metadata(db), ==, arc_is_metadata(buf)); 20082fdbea25SAleksandr Guzovskiy ASSERT(buf != NULL); 20095602294fSDan Kimmel ASSERT(arc_buf_lsize(buf) == db->db.db_size); 20102fdbea25SAleksandr Guzovskiy ASSERT(tx->tx_txg != 0); 20112fdbea25SAleksandr Guzovskiy 20122fdbea25SAleksandr Guzovskiy arc_return_buf(buf, db); 20132fdbea25SAleksandr Guzovskiy ASSERT(arc_released(buf)); 20142fdbea25SAleksandr Guzovskiy 20152fdbea25SAleksandr Guzovskiy mutex_enter(&db->db_mtx); 20162fdbea25SAleksandr Guzovskiy 20172fdbea25SAleksandr Guzovskiy while (db->db_state == DB_READ || db->db_state == DB_FILL) 20182fdbea25SAleksandr Guzovskiy cv_wait(&db->db_changed, &db->db_mtx); 20192fdbea25SAleksandr Guzovskiy 20202fdbea25SAleksandr Guzovskiy ASSERT(db->db_state == DB_CACHED || db->db_state == DB_UNCACHED); 20212fdbea25SAleksandr Guzovskiy 20222fdbea25SAleksandr Guzovskiy if (db->db_state == DB_CACHED && 20232fdbea25SAleksandr Guzovskiy refcount_count(&db->db_holds) - 1 > db->db_dirtycnt) { 20242fdbea25SAleksandr Guzovskiy mutex_exit(&db->db_mtx); 20252fdbea25SAleksandr Guzovskiy (void) dbuf_dirty(db, tx); 20262fdbea25SAleksandr Guzovskiy bcopy(buf->b_data, db->db.db_data, db->db.db_size); 2027dcbf3bd6SGeorge Wilson arc_buf_destroy(buf, db); 2028c242f9a0Schunli zhang - Sun Microsystems - Irvine United States xuio_stat_wbuf_copied(); 20292fdbea25SAleksandr Guzovskiy return; 20302fdbea25SAleksandr Guzovskiy } 20312fdbea25SAleksandr Guzovskiy 2032c242f9a0Schunli zhang - Sun Microsystems - Irvine United States xuio_stat_wbuf_nocopy(); 20332fdbea25SAleksandr Guzovskiy if (db->db_state == DB_CACHED) { 20342fdbea25SAleksandr Guzovskiy dbuf_dirty_record_t *dr = db->db_last_dirty; 20352fdbea25SAleksandr Guzovskiy 20362fdbea25SAleksandr Guzovskiy ASSERT(db->db_buf != NULL); 20372fdbea25SAleksandr Guzovskiy if (dr != NULL && dr->dr_txg == tx->tx_txg) { 20382fdbea25SAleksandr Guzovskiy ASSERT(dr->dt.dl.dr_data == db->db_buf); 20392fdbea25SAleksandr Guzovskiy if (!arc_released(db->db_buf)) { 20402fdbea25SAleksandr Guzovskiy ASSERT(dr->dt.dl.dr_override_state == 20412fdbea25SAleksandr Guzovskiy DR_OVERRIDDEN); 20422fdbea25SAleksandr Guzovskiy arc_release(db->db_buf, db); 20432fdbea25SAleksandr Guzovskiy } 20442fdbea25SAleksandr Guzovskiy dr->dt.dl.dr_data = buf; 2045dcbf3bd6SGeorge Wilson arc_buf_destroy(db->db_buf, db); 20462fdbea25SAleksandr Guzovskiy } else if (dr == NULL || dr->dt.dl.dr_data != db->db_buf) { 20472fdbea25SAleksandr Guzovskiy arc_release(db->db_buf, db); 2048dcbf3bd6SGeorge Wilson arc_buf_destroy(db->db_buf, db); 20492fdbea25SAleksandr Guzovskiy } 20502fdbea25SAleksandr Guzovskiy db->db_buf = NULL; 20512fdbea25SAleksandr Guzovskiy } 20522fdbea25SAleksandr Guzovskiy ASSERT(db->db_buf == NULL); 20532fdbea25SAleksandr Guzovskiy dbuf_set_data(db, buf); 20542fdbea25SAleksandr Guzovskiy db->db_state = DB_FILL; 20552fdbea25SAleksandr Guzovskiy mutex_exit(&db->db_mtx); 20562fdbea25SAleksandr Guzovskiy (void) dbuf_dirty(db, tx); 205743466aaeSMax Grossman dmu_buf_fill_done(&db->db, tx); 20582fdbea25SAleksandr Guzovskiy } 20592fdbea25SAleksandr Guzovskiy 2060ea8dc4b6Seschrock void 2061dcbf3bd6SGeorge Wilson dbuf_destroy(dmu_buf_impl_t *db) 2062fa9e4066Sahrens { 2063744947dcSTom Erickson dnode_t *dn; 2064ea8dc4b6Seschrock dmu_buf_impl_t *parent = db->db_parent; 2065744947dcSTom Erickson dmu_buf_impl_t *dndb; 2066fa9e4066Sahrens 2067fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 2068fa9e4066Sahrens ASSERT(refcount_is_zero(&db->db_holds)); 2069fa9e4066Sahrens 2070dcbf3bd6SGeorge Wilson if (db->db_buf != NULL) { 2071dcbf3bd6SGeorge Wilson arc_buf_destroy(db->db_buf, db); 2072dcbf3bd6SGeorge Wilson db->db_buf = NULL; 2073dcbf3bd6SGeorge Wilson } 2074ea8dc4b6Seschrock 20750a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 2076dcbf3bd6SGeorge Wilson ASSERT(db->db.db_data != NULL); 2077ea8dc4b6Seschrock zio_buf_free(db->db.db_data, DN_MAX_BONUSLEN); 20785a98e54bSBrendan Gregg - Sun Microsystems arc_space_return(DN_MAX_BONUSLEN, ARC_SPACE_OTHER); 2079fa9e4066Sahrens db->db_state = DB_UNCACHED; 2080fa9e4066Sahrens } 2081fa9e4066Sahrens 2082dcbf3bd6SGeorge Wilson dbuf_clear_data(db); 2083dcbf3bd6SGeorge Wilson 2084dcbf3bd6SGeorge Wilson if (multilist_link_active(&db->db_cache_link)) { 2085dcbf3bd6SGeorge Wilson multilist_remove(&dbuf_cache, db); 2086dcbf3bd6SGeorge Wilson (void) refcount_remove_many(&dbuf_cache_size, 2087dcbf3bd6SGeorge Wilson db->db.db_size, db); 2088dcbf3bd6SGeorge Wilson } 2089dcbf3bd6SGeorge Wilson 209082c9918fSTim Haley ASSERT(db->db_state == DB_UNCACHED || db->db_state == DB_NOFILL); 2091fa9e4066Sahrens ASSERT(db->db_data_pending == NULL); 2092fa9e4066Sahrens 2093ea8dc4b6Seschrock db->db_state = DB_EVICTING; 2094ea8dc4b6Seschrock db->db_blkptr = NULL; 2095ea8dc4b6Seschrock 2096dcbf3bd6SGeorge Wilson /* 2097dcbf3bd6SGeorge Wilson * Now that db_state is DB_EVICTING, nobody else can find this via 2098dcbf3bd6SGeorge Wilson * the hash table. We can now drop db_mtx, which allows us to 2099dcbf3bd6SGeorge Wilson * acquire the dn_dbufs_mtx. 2100dcbf3bd6SGeorge Wilson */ 2101dcbf3bd6SGeorge Wilson mutex_exit(&db->db_mtx); 2102dcbf3bd6SGeorge Wilson 2103744947dcSTom Erickson DB_DNODE_ENTER(db); 2104744947dcSTom Erickson dn = DB_DNODE(db); 2105744947dcSTom Erickson dndb = dn->dn_dbuf; 2106dcbf3bd6SGeorge Wilson if (db->db_blkid != DMU_BONUS_BLKID) { 2107dcbf3bd6SGeorge Wilson boolean_t needlock = !MUTEX_HELD(&dn->dn_dbufs_mtx); 2108dcbf3bd6SGeorge Wilson if (needlock) 2109dcbf3bd6SGeorge Wilson mutex_enter(&dn->dn_dbufs_mtx); 21100f6d88adSAlex Reece avl_remove(&dn->dn_dbufs, db); 2111640c1670SJosef 'Jeff' Sipek atomic_dec_32(&dn->dn_dbufs_count); 2112744947dcSTom Erickson membar_producer(); 2113744947dcSTom Erickson DB_DNODE_EXIT(db); 2114dcbf3bd6SGeorge Wilson if (needlock) 2115dcbf3bd6SGeorge Wilson mutex_exit(&dn->dn_dbufs_mtx); 2116744947dcSTom Erickson /* 2117744947dcSTom Erickson * Decrementing the dbuf count means that the hold corresponding 2118744947dcSTom Erickson * to the removed dbuf is no longer discounted in dnode_move(), 2119744947dcSTom Erickson * so the dnode cannot be moved until after we release the hold. 2120744947dcSTom Erickson * The membar_producer() ensures visibility of the decremented 2121744947dcSTom Erickson * value in dnode_move(), since DB_DNODE_EXIT doesn't actually 2122744947dcSTom Erickson * release any lock. 2123744947dcSTom Erickson */ 2124ea8dc4b6Seschrock dnode_rele(dn, db); 2125744947dcSTom Erickson db->db_dnode_handle = NULL; 2126dcbf3bd6SGeorge Wilson 2127dcbf3bd6SGeorge Wilson dbuf_hash_remove(db); 2128744947dcSTom Erickson } else { 2129744947dcSTom Erickson DB_DNODE_EXIT(db); 2130ea8dc4b6Seschrock } 2131ea8dc4b6Seschrock 2132dcbf3bd6SGeorge Wilson ASSERT(refcount_is_zero(&db->db_holds)); 2133ea8dc4b6Seschrock 2134dcbf3bd6SGeorge Wilson db->db_parent = NULL; 2135dcbf3bd6SGeorge Wilson 2136dcbf3bd6SGeorge Wilson ASSERT(db->db_buf == NULL); 2137dcbf3bd6SGeorge Wilson ASSERT(db->db.db_data == NULL); 2138dcbf3bd6SGeorge Wilson ASSERT(db->db_hash_next == NULL); 2139dcbf3bd6SGeorge Wilson ASSERT(db->db_blkptr == NULL); 2140dcbf3bd6SGeorge Wilson ASSERT(db->db_data_pending == NULL); 2141dcbf3bd6SGeorge Wilson ASSERT(!multilist_link_active(&db->db_cache_link)); 2142dcbf3bd6SGeorge Wilson 2143dcbf3bd6SGeorge Wilson kmem_cache_free(dbuf_kmem_cache, db); 2144dcbf3bd6SGeorge Wilson arc_space_return(sizeof (dmu_buf_impl_t), ARC_SPACE_OTHER); 2145fa9e4066Sahrens 2146fa9e4066Sahrens /* 2147744947dcSTom Erickson * If this dbuf is referenced from an indirect dbuf, 2148fa9e4066Sahrens * decrement the ref count on the indirect dbuf. 2149fa9e4066Sahrens */ 2150c543ec06Sahrens if (parent && parent != dndb) 2151ea8dc4b6Seschrock dbuf_rele(parent, db); 2152fa9e4066Sahrens } 2153fa9e4066Sahrens 2154a2cdcdd2SPaul Dagnelie /* 2155a2cdcdd2SPaul Dagnelie * Note: While bpp will always be updated if the function returns success, 2156a2cdcdd2SPaul Dagnelie * parentp will not be updated if the dnode does not have dn_dbuf filled in; 2157a2cdcdd2SPaul Dagnelie * this happens when the dnode is the meta-dnode, or a userused or groupused 2158a2cdcdd2SPaul Dagnelie * object. 2159a2cdcdd2SPaul Dagnelie */ 2160fa9e4066Sahrens static int 2161fa9e4066Sahrens dbuf_findbp(dnode_t *dn, int level, uint64_t blkid, int fail_sparse, 2162fa9e4066Sahrens dmu_buf_impl_t **parentp, blkptr_t **bpp) 2163fa9e4066Sahrens { 2164fa9e4066Sahrens int nlevels, epbs; 2165fa9e4066Sahrens 21660b69c2f0Sahrens *parentp = NULL; 21670b69c2f0Sahrens *bpp = NULL; 21680b69c2f0Sahrens 21690a586ceaSMark Shellenbaum ASSERT(blkid != DMU_BONUS_BLKID); 21700a586ceaSMark Shellenbaum 21710a586ceaSMark Shellenbaum if (blkid == DMU_SPILL_BLKID) { 21720a586ceaSMark Shellenbaum mutex_enter(&dn->dn_mtx); 217306e0070dSMark Shellenbaum if (dn->dn_have_spill && 217406e0070dSMark Shellenbaum (dn->dn_phys->dn_flags & DNODE_FLAG_SPILL_BLKPTR)) 21750a586ceaSMark Shellenbaum *bpp = &dn->dn_phys->dn_spill; 21760a586ceaSMark Shellenbaum else 21770a586ceaSMark Shellenbaum *bpp = NULL; 21780a586ceaSMark Shellenbaum dbuf_add_ref(dn->dn_dbuf, NULL); 21790a586ceaSMark Shellenbaum *parentp = dn->dn_dbuf; 21800a586ceaSMark Shellenbaum mutex_exit(&dn->dn_mtx); 21810a586ceaSMark Shellenbaum return (0); 21820a586ceaSMark Shellenbaum } 2183ea8dc4b6Seschrock 2184fa9e4066Sahrens if (dn->dn_phys->dn_nlevels == 0) 2185fa9e4066Sahrens nlevels = 1; 2186fa9e4066Sahrens else 2187fa9e4066Sahrens nlevels = dn->dn_phys->dn_nlevels; 2188fa9e4066Sahrens 2189fa9e4066Sahrens epbs = dn->dn_indblkshift - SPA_BLKPTRSHIFT; 2190fa9e4066Sahrens 2191fa9e4066Sahrens ASSERT3U(level * epbs, <, 64); 2192fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 2193ea8dc4b6Seschrock if (level >= nlevels || 2194fa9e4066Sahrens (blkid > (dn->dn_phys->dn_maxblkid >> (level * epbs)))) { 2195fa9e4066Sahrens /* the buffer has no parent yet */ 2196be6fd75aSMatthew Ahrens return (SET_ERROR(ENOENT)); 2197fa9e4066Sahrens } else if (level < nlevels-1) { 2198fa9e4066Sahrens /* this block is referenced from an indirect block */ 2199fa9e4066Sahrens int err = dbuf_hold_impl(dn, level+1, 2200a2cdcdd2SPaul Dagnelie blkid >> epbs, fail_sparse, FALSE, NULL, parentp); 2201fa9e4066Sahrens if (err) 2202fa9e4066Sahrens return (err); 2203ea8dc4b6Seschrock err = dbuf_read(*parentp, NULL, 2204ea8dc4b6Seschrock (DB_RF_HAVESTRUCT | DB_RF_NOPREFETCH | DB_RF_CANFAIL)); 2205c543ec06Sahrens if (err) { 2206c543ec06Sahrens dbuf_rele(*parentp, NULL); 2207c543ec06Sahrens *parentp = NULL; 2208c543ec06Sahrens return (err); 2209c543ec06Sahrens } 2210fa9e4066Sahrens *bpp = ((blkptr_t *)(*parentp)->db.db_data) + 2211fa9e4066Sahrens (blkid & ((1ULL << epbs) - 1)); 2212c543ec06Sahrens return (0); 2213fa9e4066Sahrens } else { 2214fa9e4066Sahrens /* the block is referenced from the dnode */ 2215fa9e4066Sahrens ASSERT3U(level, ==, nlevels-1); 2216fa9e4066Sahrens ASSERT(dn->dn_phys->dn_nblkptr == 0 || 2217fa9e4066Sahrens blkid < dn->dn_phys->dn_nblkptr); 2218c543ec06Sahrens if (dn->dn_dbuf) { 2219c543ec06Sahrens dbuf_add_ref(dn->dn_dbuf, NULL); 2220fa9e4066Sahrens *parentp = dn->dn_dbuf; 2221c543ec06Sahrens } 2222fa9e4066Sahrens *bpp = &dn->dn_phys->dn_blkptr[blkid]; 2223fa9e4066Sahrens return (0); 2224fa9e4066Sahrens } 2225fa9e4066Sahrens } 2226fa9e4066Sahrens 2227fa9e4066Sahrens static dmu_buf_impl_t * 2228fa9e4066Sahrens dbuf_create(dnode_t *dn, uint8_t level, uint64_t blkid, 2229fa9e4066Sahrens dmu_buf_impl_t *parent, blkptr_t *blkptr) 2230fa9e4066Sahrens { 2231503ad85cSMatthew Ahrens objset_t *os = dn->dn_objset; 2232fa9e4066Sahrens dmu_buf_impl_t *db, *odb; 2233fa9e4066Sahrens 2234fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 2235fa9e4066Sahrens ASSERT(dn->dn_type != DMU_OT_NONE); 2236fa9e4066Sahrens 2237dcbf3bd6SGeorge Wilson db = kmem_cache_alloc(dbuf_kmem_cache, KM_SLEEP); 2238fa9e4066Sahrens 2239fa9e4066Sahrens db->db_objset = os; 2240fa9e4066Sahrens db->db.db_object = dn->dn_object; 2241fa9e4066Sahrens db->db_level = level; 2242fa9e4066Sahrens db->db_blkid = blkid; 2243c717a561Smaybee db->db_last_dirty = NULL; 2244ea8dc4b6Seschrock db->db_dirtycnt = 0; 2245744947dcSTom Erickson db->db_dnode_handle = dn->dn_handle; 2246ea8dc4b6Seschrock db->db_parent = parent; 2247ea8dc4b6Seschrock db->db_blkptr = blkptr; 2248fa9e4066Sahrens 2249bc9014e6SJustin Gibbs db->db_user = NULL; 2250d2058105SJustin T. Gibbs db->db_user_immediate_evict = FALSE; 2251d2058105SJustin T. Gibbs db->db_freed_in_flight = FALSE; 2252d2058105SJustin T. Gibbs db->db_pending_evict = FALSE; 2253ea8dc4b6Seschrock 22540a586ceaSMark Shellenbaum if (blkid == DMU_BONUS_BLKID) { 2255ea8dc4b6Seschrock ASSERT3P(parent, ==, dn->dn_dbuf); 22561934e92fSmaybee db->db.db_size = DN_MAX_BONUSLEN - 22571934e92fSmaybee (dn->dn_nblkptr-1) * sizeof (blkptr_t); 22581934e92fSmaybee ASSERT3U(db->db.db_size, >=, dn->dn_bonuslen); 22590a586ceaSMark Shellenbaum db->db.db_offset = DMU_BONUS_BLKID; 2260ea8dc4b6Seschrock db->db_state = DB_UNCACHED; 2261ea8dc4b6Seschrock /* the bonus dbuf is not placed in the hash table */ 22625a98e54bSBrendan Gregg - Sun Microsystems arc_space_consume(sizeof (dmu_buf_impl_t), ARC_SPACE_OTHER); 2263ea8dc4b6Seschrock return (db); 22640a586ceaSMark Shellenbaum } else if (blkid == DMU_SPILL_BLKID) { 22650a586ceaSMark Shellenbaum db->db.db_size = (blkptr != NULL) ? 22660a586ceaSMark Shellenbaum BP_GET_LSIZE(blkptr) : SPA_MINBLOCKSIZE; 22670a586ceaSMark Shellenbaum db->db.db_offset = 0; 2268fa9e4066Sahrens } else { 2269fa9e4066Sahrens int blocksize = 2270fa9e4066Sahrens db->db_level ? 1 << dn->dn_indblkshift : dn->dn_datablksz; 2271fa9e4066Sahrens db->db.db_size = blocksize; 2272fa9e4066Sahrens db->db.db_offset = db->db_blkid * blocksize; 2273fa9e4066Sahrens } 2274fa9e4066Sahrens 2275fa9e4066Sahrens /* 2276fa9e4066Sahrens * Hold the dn_dbufs_mtx while we get the new dbuf 2277fa9e4066Sahrens * in the hash table *and* added to the dbufs list. 2278fa9e4066Sahrens * This prevents a possible deadlock with someone 2279fa9e4066Sahrens * trying to look up this dbuf before its added to the 2280fa9e4066Sahrens * dn_dbufs list. 2281fa9e4066Sahrens */ 2282fa9e4066Sahrens mutex_enter(&dn->dn_dbufs_mtx); 2283ea8dc4b6Seschrock db->db_state = DB_EVICTING; 2284fa9e4066Sahrens if ((odb = dbuf_hash_insert(db)) != NULL) { 2285fa9e4066Sahrens /* someone else inserted it first */ 2286dcbf3bd6SGeorge Wilson kmem_cache_free(dbuf_kmem_cache, db); 2287fa9e4066Sahrens mutex_exit(&dn->dn_dbufs_mtx); 2288fa9e4066Sahrens return (odb); 2289fa9e4066Sahrens } 22900f6d88adSAlex Reece avl_add(&dn->dn_dbufs, db); 2291653af1b8SStephen Blinick 2292ea8dc4b6Seschrock db->db_state = DB_UNCACHED; 2293fa9e4066Sahrens mutex_exit(&dn->dn_dbufs_mtx); 22945a98e54bSBrendan Gregg - Sun Microsystems arc_space_consume(sizeof (dmu_buf_impl_t), ARC_SPACE_OTHER); 2295fa9e4066Sahrens 2296fa9e4066Sahrens if (parent && parent != dn->dn_dbuf) 2297fa9e4066Sahrens dbuf_add_ref(parent, db); 2298fa9e4066Sahrens 2299ea8dc4b6Seschrock ASSERT(dn->dn_object == DMU_META_DNODE_OBJECT || 2300ea8dc4b6Seschrock refcount_count(&dn->dn_holds) > 0); 2301fa9e4066Sahrens (void) refcount_add(&dn->dn_holds, db); 2302640c1670SJosef 'Jeff' Sipek atomic_inc_32(&dn->dn_dbufs_count); 2303fa9e4066Sahrens 2304fa9e4066Sahrens dprintf_dbuf(db, "db=%p\n", db); 2305fa9e4066Sahrens 2306fa9e4066Sahrens return (db); 2307fa9e4066Sahrens } 2308fa9e4066Sahrens 2309a2cdcdd2SPaul Dagnelie typedef struct dbuf_prefetch_arg { 2310a2cdcdd2SPaul Dagnelie spa_t *dpa_spa; /* The spa to issue the prefetch in. */ 2311a2cdcdd2SPaul Dagnelie zbookmark_phys_t dpa_zb; /* The target block to prefetch. */ 2312a2cdcdd2SPaul Dagnelie int dpa_epbs; /* Entries (blkptr_t's) Per Block Shift. */ 2313a2cdcdd2SPaul Dagnelie int dpa_curlevel; /* The current level that we're reading */ 2314dcbf3bd6SGeorge Wilson dnode_t *dpa_dnode; /* The dnode associated with the prefetch */ 2315a2cdcdd2SPaul Dagnelie zio_priority_t dpa_prio; /* The priority I/Os should be issued at. */ 2316a2cdcdd2SPaul Dagnelie zio_t *dpa_zio; /* The parent zio_t for all prefetches. */ 2317a2cdcdd2SPaul Dagnelie arc_flags_t dpa_aflags; /* Flags to pass to the final prefetch. */ 2318a2cdcdd2SPaul Dagnelie } dbuf_prefetch_arg_t; 2319a2cdcdd2SPaul Dagnelie 2320a2cdcdd2SPaul Dagnelie /* 2321a2cdcdd2SPaul Dagnelie * Actually issue the prefetch read for the block given. 2322a2cdcdd2SPaul Dagnelie */ 2323a2cdcdd2SPaul Dagnelie static void 2324a2cdcdd2SPaul Dagnelie dbuf_issue_final_prefetch(dbuf_prefetch_arg_t *dpa, blkptr_t *bp) 2325fa9e4066Sahrens { 2326a2cdcdd2SPaul Dagnelie if (BP_IS_HOLE(bp) || BP_IS_EMBEDDED(bp)) 2327a2cdcdd2SPaul Dagnelie return; 2328a2cdcdd2SPaul Dagnelie 2329a2cdcdd2SPaul Dagnelie arc_flags_t aflags = 2330a2cdcdd2SPaul Dagnelie dpa->dpa_aflags | ARC_FLAG_NOWAIT | ARC_FLAG_PREFETCH; 2331a2cdcdd2SPaul Dagnelie 2332a2cdcdd2SPaul Dagnelie ASSERT3U(dpa->dpa_curlevel, ==, BP_GET_LEVEL(bp)); 2333a2cdcdd2SPaul Dagnelie ASSERT3U(dpa->dpa_curlevel, ==, dpa->dpa_zb.zb_level); 2334a2cdcdd2SPaul Dagnelie ASSERT(dpa->dpa_zio != NULL); 2335a2cdcdd2SPaul Dagnelie (void) arc_read(dpa->dpa_zio, dpa->dpa_spa, bp, NULL, NULL, 2336a2cdcdd2SPaul Dagnelie dpa->dpa_prio, ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE, 2337a2cdcdd2SPaul Dagnelie &aflags, &dpa->dpa_zb); 2338a2cdcdd2SPaul Dagnelie } 2339a2cdcdd2SPaul Dagnelie 2340a2cdcdd2SPaul Dagnelie /* 2341a2cdcdd2SPaul Dagnelie * Called when an indirect block above our prefetch target is read in. This 2342a2cdcdd2SPaul Dagnelie * will either read in the next indirect block down the tree or issue the actual 2343a2cdcdd2SPaul Dagnelie * prefetch if the next block down is our target. 2344a2cdcdd2SPaul Dagnelie */ 2345a2cdcdd2SPaul Dagnelie static void 2346a2cdcdd2SPaul Dagnelie dbuf_prefetch_indirect_done(zio_t *zio, arc_buf_t *abuf, void *private) 2347a2cdcdd2SPaul Dagnelie { 2348a2cdcdd2SPaul Dagnelie dbuf_prefetch_arg_t *dpa = private; 2349a2cdcdd2SPaul Dagnelie 2350a2cdcdd2SPaul Dagnelie ASSERT3S(dpa->dpa_zb.zb_level, <, dpa->dpa_curlevel); 2351a2cdcdd2SPaul Dagnelie ASSERT3S(dpa->dpa_curlevel, >, 0); 2352dcbf3bd6SGeorge Wilson 2353dcbf3bd6SGeorge Wilson /* 2354dcbf3bd6SGeorge Wilson * The dpa_dnode is only valid if we are called with a NULL 2355dcbf3bd6SGeorge Wilson * zio. This indicates that the arc_read() returned without 2356dcbf3bd6SGeorge Wilson * first calling zio_read() to issue a physical read. Once 2357dcbf3bd6SGeorge Wilson * a physical read is made the dpa_dnode must be invalidated 2358dcbf3bd6SGeorge Wilson * as the locks guarding it may have been dropped. If the 2359dcbf3bd6SGeorge Wilson * dpa_dnode is still valid, then we want to add it to the dbuf 2360dcbf3bd6SGeorge Wilson * cache. To do so, we must hold the dbuf associated with the block 2361dcbf3bd6SGeorge Wilson * we just prefetched, read its contents so that we associate it 2362dcbf3bd6SGeorge Wilson * with an arc_buf_t, and then release it. 2363dcbf3bd6SGeorge Wilson */ 2364a2cdcdd2SPaul Dagnelie if (zio != NULL) { 2365a2cdcdd2SPaul Dagnelie ASSERT3S(BP_GET_LEVEL(zio->io_bp), ==, dpa->dpa_curlevel); 2366dcbf3bd6SGeorge Wilson if (zio->io_flags & ZIO_FLAG_RAW) { 2367dcbf3bd6SGeorge Wilson ASSERT3U(BP_GET_PSIZE(zio->io_bp), ==, zio->io_size); 2368dcbf3bd6SGeorge Wilson } else { 2369a2cdcdd2SPaul Dagnelie ASSERT3U(BP_GET_LSIZE(zio->io_bp), ==, zio->io_size); 2370dcbf3bd6SGeorge Wilson } 2371a2cdcdd2SPaul Dagnelie ASSERT3P(zio->io_spa, ==, dpa->dpa_spa); 2372dcbf3bd6SGeorge Wilson 2373dcbf3bd6SGeorge Wilson dpa->dpa_dnode = NULL; 2374dcbf3bd6SGeorge Wilson } else if (dpa->dpa_dnode != NULL) { 2375dcbf3bd6SGeorge Wilson uint64_t curblkid = dpa->dpa_zb.zb_blkid >> 2376dcbf3bd6SGeorge Wilson (dpa->dpa_epbs * (dpa->dpa_curlevel - 2377dcbf3bd6SGeorge Wilson dpa->dpa_zb.zb_level)); 2378dcbf3bd6SGeorge Wilson dmu_buf_impl_t *db = dbuf_hold_level(dpa->dpa_dnode, 2379dcbf3bd6SGeorge Wilson dpa->dpa_curlevel, curblkid, FTAG); 2380dcbf3bd6SGeorge Wilson (void) dbuf_read(db, NULL, 2381dcbf3bd6SGeorge Wilson DB_RF_MUST_SUCCEED | DB_RF_NOPREFETCH | DB_RF_HAVESTRUCT); 2382dcbf3bd6SGeorge Wilson dbuf_rele(db, FTAG); 2383a2cdcdd2SPaul Dagnelie } 2384a2cdcdd2SPaul Dagnelie 2385a2cdcdd2SPaul Dagnelie dpa->dpa_curlevel--; 2386a2cdcdd2SPaul Dagnelie 2387a2cdcdd2SPaul Dagnelie uint64_t nextblkid = dpa->dpa_zb.zb_blkid >> 2388a2cdcdd2SPaul Dagnelie (dpa->dpa_epbs * (dpa->dpa_curlevel - dpa->dpa_zb.zb_level)); 2389a2cdcdd2SPaul Dagnelie blkptr_t *bp = ((blkptr_t *)abuf->b_data) + 2390a2cdcdd2SPaul Dagnelie P2PHASE(nextblkid, 1ULL << dpa->dpa_epbs); 2391a2cdcdd2SPaul Dagnelie if (BP_IS_HOLE(bp) || (zio != NULL && zio->io_error != 0)) { 2392a2cdcdd2SPaul Dagnelie kmem_free(dpa, sizeof (*dpa)); 2393a2cdcdd2SPaul Dagnelie } else if (dpa->dpa_curlevel == dpa->dpa_zb.zb_level) { 2394a2cdcdd2SPaul Dagnelie ASSERT3U(nextblkid, ==, dpa->dpa_zb.zb_blkid); 2395a2cdcdd2SPaul Dagnelie dbuf_issue_final_prefetch(dpa, bp); 2396a2cdcdd2SPaul Dagnelie kmem_free(dpa, sizeof (*dpa)); 2397a2cdcdd2SPaul Dagnelie } else { 2398a2cdcdd2SPaul Dagnelie arc_flags_t iter_aflags = ARC_FLAG_NOWAIT; 2399a2cdcdd2SPaul Dagnelie zbookmark_phys_t zb; 2400a2cdcdd2SPaul Dagnelie 2401a2cdcdd2SPaul Dagnelie ASSERT3U(dpa->dpa_curlevel, ==, BP_GET_LEVEL(bp)); 2402a2cdcdd2SPaul Dagnelie 2403a2cdcdd2SPaul Dagnelie SET_BOOKMARK(&zb, dpa->dpa_zb.zb_objset, 2404a2cdcdd2SPaul Dagnelie dpa->dpa_zb.zb_object, dpa->dpa_curlevel, nextblkid); 2405a2cdcdd2SPaul Dagnelie 2406a2cdcdd2SPaul Dagnelie (void) arc_read(dpa->dpa_zio, dpa->dpa_spa, 2407a2cdcdd2SPaul Dagnelie bp, dbuf_prefetch_indirect_done, dpa, dpa->dpa_prio, 2408a2cdcdd2SPaul Dagnelie ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE, 2409a2cdcdd2SPaul Dagnelie &iter_aflags, &zb); 2410a2cdcdd2SPaul Dagnelie } 2411dcbf3bd6SGeorge Wilson 2412dcbf3bd6SGeorge Wilson arc_buf_destroy(abuf, private); 2413a2cdcdd2SPaul Dagnelie } 2414a2cdcdd2SPaul Dagnelie 2415a2cdcdd2SPaul Dagnelie /* 2416a2cdcdd2SPaul Dagnelie * Issue prefetch reads for the given block on the given level. If the indirect 2417a2cdcdd2SPaul Dagnelie * blocks above that block are not in memory, we will read them in 2418a2cdcdd2SPaul Dagnelie * asynchronously. As a result, this call never blocks waiting for a read to 2419a2cdcdd2SPaul Dagnelie * complete. 2420a2cdcdd2SPaul Dagnelie */ 2421a2cdcdd2SPaul Dagnelie void 2422a2cdcdd2SPaul Dagnelie dbuf_prefetch(dnode_t *dn, int64_t level, uint64_t blkid, zio_priority_t prio, 2423a2cdcdd2SPaul Dagnelie arc_flags_t aflags) 2424a2cdcdd2SPaul Dagnelie { 2425a2cdcdd2SPaul Dagnelie blkptr_t bp; 2426a2cdcdd2SPaul Dagnelie int epbs, nlevels, curlevel; 2427a2cdcdd2SPaul Dagnelie uint64_t curblkid; 2428fa9e4066Sahrens 24290a586ceaSMark Shellenbaum ASSERT(blkid != DMU_BONUS_BLKID); 2430fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 2431fa9e4066Sahrens 2432cf6106c8SMatthew Ahrens if (blkid > dn->dn_maxblkid) 2433cf6106c8SMatthew Ahrens return; 2434cf6106c8SMatthew Ahrens 2435fa9e4066Sahrens if (dnode_block_freed(dn, blkid)) 2436fa9e4066Sahrens return; 2437fa9e4066Sahrens 2438fa9e4066Sahrens /* 2439a2cdcdd2SPaul Dagnelie * This dnode hasn't been written to disk yet, so there's nothing to 2440a2cdcdd2SPaul Dagnelie * prefetch. 2441fa9e4066Sahrens */ 2442a2cdcdd2SPaul Dagnelie nlevels = dn->dn_phys->dn_nlevels; 2443a2cdcdd2SPaul Dagnelie if (level >= nlevels || dn->dn_phys->dn_nblkptr == 0) 2444a2cdcdd2SPaul Dagnelie return; 2445a2cdcdd2SPaul Dagnelie 2446a2cdcdd2SPaul Dagnelie epbs = dn->dn_phys->dn_indblkshift - SPA_BLKPTRSHIFT; 2447a2cdcdd2SPaul Dagnelie if (dn->dn_phys->dn_maxblkid < blkid << (epbs * level)) 2448a2cdcdd2SPaul Dagnelie return; 2449a2cdcdd2SPaul Dagnelie 2450a2cdcdd2SPaul Dagnelie dmu_buf_impl_t *db = dbuf_find(dn->dn_objset, dn->dn_object, 2451a2cdcdd2SPaul Dagnelie level, blkid); 2452a2cdcdd2SPaul Dagnelie if (db != NULL) { 2453fa9e4066Sahrens mutex_exit(&db->db_mtx); 2454a2cdcdd2SPaul Dagnelie /* 2455a2cdcdd2SPaul Dagnelie * This dbuf already exists. It is either CACHED, or 2456a2cdcdd2SPaul Dagnelie * (we assume) about to be read or filled. 2457a2cdcdd2SPaul Dagnelie */ 2458fa9e4066Sahrens return; 2459fa9e4066Sahrens } 2460fa9e4066Sahrens 2461a2cdcdd2SPaul Dagnelie /* 2462a2cdcdd2SPaul Dagnelie * Find the closest ancestor (indirect block) of the target block 2463a2cdcdd2SPaul Dagnelie * that is present in the cache. In this indirect block, we will 2464a2cdcdd2SPaul Dagnelie * find the bp that is at curlevel, curblkid. 2465a2cdcdd2SPaul Dagnelie */ 2466a2cdcdd2SPaul Dagnelie curlevel = level; 2467a2cdcdd2SPaul Dagnelie curblkid = blkid; 2468a2cdcdd2SPaul Dagnelie while (curlevel < nlevels - 1) { 2469a2cdcdd2SPaul Dagnelie int parent_level = curlevel + 1; 2470a2cdcdd2SPaul Dagnelie uint64_t parent_blkid = curblkid >> epbs; 2471a2cdcdd2SPaul Dagnelie dmu_buf_impl_t *db; 2472a2cdcdd2SPaul Dagnelie 2473a2cdcdd2SPaul Dagnelie if (dbuf_hold_impl(dn, parent_level, parent_blkid, 2474a2cdcdd2SPaul Dagnelie FALSE, TRUE, FTAG, &db) == 0) { 2475a2cdcdd2SPaul Dagnelie blkptr_t *bpp = db->db_buf->b_data; 2476a2cdcdd2SPaul Dagnelie bp = bpp[P2PHASE(curblkid, 1 << epbs)]; 2477a2cdcdd2SPaul Dagnelie dbuf_rele(db, FTAG); 2478a2cdcdd2SPaul Dagnelie break; 2479a2cdcdd2SPaul Dagnelie } 2480a2cdcdd2SPaul Dagnelie 2481a2cdcdd2SPaul Dagnelie curlevel = parent_level; 2482a2cdcdd2SPaul Dagnelie curblkid = parent_blkid; 2483a2cdcdd2SPaul Dagnelie } 2484a2cdcdd2SPaul Dagnelie 2485a2cdcdd2SPaul Dagnelie if (curlevel == nlevels - 1) { 2486a2cdcdd2SPaul Dagnelie /* No cached indirect blocks found. */ 2487a2cdcdd2SPaul Dagnelie ASSERT3U(curblkid, <, dn->dn_phys->dn_nblkptr); 2488a2cdcdd2SPaul Dagnelie bp = dn->dn_phys->dn_blkptr[curblkid]; 2489a2cdcdd2SPaul Dagnelie } 2490a2cdcdd2SPaul Dagnelie if (BP_IS_HOLE(&bp)) 2491a2cdcdd2SPaul Dagnelie return; 2492a2cdcdd2SPaul Dagnelie 2493a2cdcdd2SPaul Dagnelie ASSERT3U(curlevel, ==, BP_GET_LEVEL(&bp)); 2494a2cdcdd2SPaul Dagnelie 2495a2cdcdd2SPaul Dagnelie zio_t *pio = zio_root(dmu_objset_spa(dn->dn_objset), NULL, NULL, 2496a2cdcdd2SPaul Dagnelie ZIO_FLAG_CANFAIL); 2497a2cdcdd2SPaul Dagnelie 2498a2cdcdd2SPaul Dagnelie dbuf_prefetch_arg_t *dpa = kmem_zalloc(sizeof (*dpa), KM_SLEEP); 2499b24ab676SJeff Bonwick dsl_dataset_t *ds = dn->dn_objset->os_dsl_dataset; 2500a2cdcdd2SPaul Dagnelie SET_BOOKMARK(&dpa->dpa_zb, ds != NULL ? ds->ds_object : DMU_META_OBJSET, 2501a2cdcdd2SPaul Dagnelie dn->dn_object, level, blkid); 2502a2cdcdd2SPaul Dagnelie dpa->dpa_curlevel = curlevel; 2503a2cdcdd2SPaul Dagnelie dpa->dpa_prio = prio; 2504a2cdcdd2SPaul Dagnelie dpa->dpa_aflags = aflags; 2505a2cdcdd2SPaul Dagnelie dpa->dpa_spa = dn->dn_objset->os_spa; 2506dcbf3bd6SGeorge Wilson dpa->dpa_dnode = dn; 2507a2cdcdd2SPaul Dagnelie dpa->dpa_epbs = epbs; 2508a2cdcdd2SPaul Dagnelie dpa->dpa_zio = pio; 2509a2cdcdd2SPaul Dagnelie 2510a2cdcdd2SPaul Dagnelie /* 2511a2cdcdd2SPaul Dagnelie * If we have the indirect just above us, no need to do the asynchronous 2512a2cdcdd2SPaul Dagnelie * prefetch chain; we'll just run the last step ourselves. If we're at 2513a2cdcdd2SPaul Dagnelie * a higher level, though, we want to issue the prefetches for all the 2514a2cdcdd2SPaul Dagnelie * indirect blocks asynchronously, so we can go on with whatever we were 2515a2cdcdd2SPaul Dagnelie * doing. 2516a2cdcdd2SPaul Dagnelie */ 2517a2cdcdd2SPaul Dagnelie if (curlevel == level) { 2518a2cdcdd2SPaul Dagnelie ASSERT3U(curblkid, ==, blkid); 2519a2cdcdd2SPaul Dagnelie dbuf_issue_final_prefetch(dpa, &bp); 2520a2cdcdd2SPaul Dagnelie kmem_free(dpa, sizeof (*dpa)); 2521a2cdcdd2SPaul Dagnelie } else { 2522a2cdcdd2SPaul Dagnelie arc_flags_t iter_aflags = ARC_FLAG_NOWAIT; 25237802d7bfSMatthew Ahrens zbookmark_phys_t zb; 2524b24ab676SJeff Bonwick 2525a2cdcdd2SPaul Dagnelie SET_BOOKMARK(&zb, ds != NULL ? ds->ds_object : DMU_META_OBJSET, 2526a2cdcdd2SPaul Dagnelie dn->dn_object, curlevel, curblkid); 2527a2cdcdd2SPaul Dagnelie (void) arc_read(dpa->dpa_zio, dpa->dpa_spa, 2528a2cdcdd2SPaul Dagnelie &bp, dbuf_prefetch_indirect_done, dpa, prio, 2529fa9e4066Sahrens ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE, 2530a2cdcdd2SPaul Dagnelie &iter_aflags, &zb); 2531fa9e4066Sahrens } 2532a2cdcdd2SPaul Dagnelie /* 2533a2cdcdd2SPaul Dagnelie * We use pio here instead of dpa_zio since it's possible that 2534a2cdcdd2SPaul Dagnelie * dpa may have already been freed. 2535a2cdcdd2SPaul Dagnelie */ 2536a2cdcdd2SPaul Dagnelie zio_nowait(pio); 2537fa9e4066Sahrens } 2538fa9e4066Sahrens 2539fa9e4066Sahrens /* 2540fa9e4066Sahrens * Returns with db_holds incremented, and db_mtx not held. 2541fa9e4066Sahrens * Note: dn_struct_rwlock must be held. 2542fa9e4066Sahrens */ 2543fa9e4066Sahrens int 2544a2cdcdd2SPaul Dagnelie dbuf_hold_impl(dnode_t *dn, uint8_t level, uint64_t blkid, 2545a2cdcdd2SPaul Dagnelie boolean_t fail_sparse, boolean_t fail_uncached, 2546fa9e4066Sahrens void *tag, dmu_buf_impl_t **dbp) 2547fa9e4066Sahrens { 2548fa9e4066Sahrens dmu_buf_impl_t *db, *parent = NULL; 2549fa9e4066Sahrens 25500a586ceaSMark Shellenbaum ASSERT(blkid != DMU_BONUS_BLKID); 2551fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 2552fa9e4066Sahrens ASSERT3U(dn->dn_nlevels, >, level); 2553fa9e4066Sahrens 2554fa9e4066Sahrens *dbp = NULL; 2555ea8dc4b6Seschrock top: 2556fa9e4066Sahrens /* dbuf_find() returns with db_mtx held */ 2557e57a022bSJustin T. Gibbs db = dbuf_find(dn->dn_objset, dn->dn_object, level, blkid); 2558fa9e4066Sahrens 2559fa9e4066Sahrens if (db == NULL) { 2560fa9e4066Sahrens blkptr_t *bp = NULL; 2561fa9e4066Sahrens int err; 2562fa9e4066Sahrens 2563a2cdcdd2SPaul Dagnelie if (fail_uncached) 2564a2cdcdd2SPaul Dagnelie return (SET_ERROR(ENOENT)); 2565a2cdcdd2SPaul Dagnelie 2566c543ec06Sahrens ASSERT3P(parent, ==, NULL); 2567fa9e4066Sahrens err = dbuf_findbp(dn, level, blkid, fail_sparse, &parent, &bp); 2568fa9e4066Sahrens if (fail_sparse) { 2569fa9e4066Sahrens if (err == 0 && bp && BP_IS_HOLE(bp)) 2570be6fd75aSMatthew Ahrens err = SET_ERROR(ENOENT); 2571fa9e4066Sahrens if (err) { 2572c543ec06Sahrens if (parent) 2573ea8dc4b6Seschrock dbuf_rele(parent, NULL); 2574fa9e4066Sahrens return (err); 2575fa9e4066Sahrens } 2576fa9e4066Sahrens } 2577ea8dc4b6Seschrock if (err && err != ENOENT) 2578ea8dc4b6Seschrock return (err); 2579fa9e4066Sahrens db = dbuf_create(dn, level, blkid, parent, bp); 2580fa9e4066Sahrens } 2581fa9e4066Sahrens 2582a2cdcdd2SPaul Dagnelie if (fail_uncached && db->db_state != DB_CACHED) { 2583a2cdcdd2SPaul Dagnelie mutex_exit(&db->db_mtx); 2584a2cdcdd2SPaul Dagnelie return (SET_ERROR(ENOENT)); 2585a2cdcdd2SPaul Dagnelie } 2586a2cdcdd2SPaul Dagnelie 2587dcbf3bd6SGeorge Wilson if (db->db_buf != NULL) 2588ea8dc4b6Seschrock ASSERT3P(db->db.db_data, ==, db->db_buf->b_data); 2589ea8dc4b6Seschrock 2590ea8dc4b6Seschrock ASSERT(db->db_buf == NULL || arc_referenced(db->db_buf)); 2591ea8dc4b6Seschrock 2592fa9e4066Sahrens /* 2593c717a561Smaybee * If this buffer is currently syncing out, and we are are 2594c717a561Smaybee * still referencing it from db_data, we need to make a copy 2595c717a561Smaybee * of it in case we decide we want to dirty it again in this txg. 2596fa9e4066Sahrens */ 25970a586ceaSMark Shellenbaum if (db->db_level == 0 && db->db_blkid != DMU_BONUS_BLKID && 2598ea8dc4b6Seschrock dn->dn_object != DMU_META_DNODE_OBJECT && 2599c717a561Smaybee db->db_state == DB_CACHED && db->db_data_pending) { 2600c717a561Smaybee dbuf_dirty_record_t *dr = db->db_data_pending; 2601c717a561Smaybee 2602c717a561Smaybee if (dr->dt.dl.dr_data == db->db_buf) { 2603ad23a2dbSjohansen arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 2604fa9e4066Sahrens 2605c717a561Smaybee dbuf_set_data(db, 26065602294fSDan Kimmel arc_alloc_buf(dn->dn_objset->os_spa, db, type, 26075602294fSDan Kimmel db->db.db_size)); 2608c717a561Smaybee bcopy(dr->dt.dl.dr_data->b_data, db->db.db_data, 2609fa9e4066Sahrens db->db.db_size); 2610fa9e4066Sahrens } 2611c717a561Smaybee } 2612fa9e4066Sahrens 2613dcbf3bd6SGeorge Wilson if (multilist_link_active(&db->db_cache_link)) { 2614dcbf3bd6SGeorge Wilson ASSERT(refcount_is_zero(&db->db_holds)); 2615dcbf3bd6SGeorge Wilson multilist_remove(&dbuf_cache, db); 2616dcbf3bd6SGeorge Wilson (void) refcount_remove_many(&dbuf_cache_size, 2617dcbf3bd6SGeorge Wilson db->db.db_size, db); 2618dcbf3bd6SGeorge Wilson } 2619ea8dc4b6Seschrock (void) refcount_add(&db->db_holds, tag); 26209c9dc39aSek110237 DBUF_VERIFY(db); 2621fa9e4066Sahrens mutex_exit(&db->db_mtx); 2622fa9e4066Sahrens 2623fa9e4066Sahrens /* NOTE: we can't rele the parent until after we drop the db_mtx */ 2624c543ec06Sahrens if (parent) 2625ea8dc4b6Seschrock dbuf_rele(parent, NULL); 2626fa9e4066Sahrens 2627744947dcSTom Erickson ASSERT3P(DB_DNODE(db), ==, dn); 2628fa9e4066Sahrens ASSERT3U(db->db_blkid, ==, blkid); 2629fa9e4066Sahrens ASSERT3U(db->db_level, ==, level); 2630fa9e4066Sahrens *dbp = db; 2631fa9e4066Sahrens 2632fa9e4066Sahrens return (0); 2633fa9e4066Sahrens } 2634fa9e4066Sahrens 2635fa9e4066Sahrens dmu_buf_impl_t * 2636ea8dc4b6Seschrock dbuf_hold(dnode_t *dn, uint64_t blkid, void *tag) 2637fa9e4066Sahrens { 2638a2cdcdd2SPaul Dagnelie return (dbuf_hold_level(dn, 0, blkid, tag)); 2639fa9e4066Sahrens } 2640fa9e4066Sahrens 2641fa9e4066Sahrens dmu_buf_impl_t * 2642fa9e4066Sahrens dbuf_hold_level(dnode_t *dn, int level, uint64_t blkid, void *tag) 2643fa9e4066Sahrens { 2644fa9e4066Sahrens dmu_buf_impl_t *db; 2645a2cdcdd2SPaul Dagnelie int err = dbuf_hold_impl(dn, level, blkid, FALSE, FALSE, tag, &db); 2646ea8dc4b6Seschrock return (err ? NULL : db); 2647fa9e4066Sahrens } 2648fa9e4066Sahrens 26491934e92fSmaybee void 2650ea8dc4b6Seschrock dbuf_create_bonus(dnode_t *dn) 2651fa9e4066Sahrens { 2652ea8dc4b6Seschrock ASSERT(RW_WRITE_HELD(&dn->dn_struct_rwlock)); 2653ea8dc4b6Seschrock 2654ea8dc4b6Seschrock ASSERT(dn->dn_bonus == NULL); 26550a586ceaSMark Shellenbaum dn->dn_bonus = dbuf_create(dn, 0, DMU_BONUS_BLKID, dn->dn_dbuf, NULL); 26560a586ceaSMark Shellenbaum } 26570a586ceaSMark Shellenbaum 26580a586ceaSMark Shellenbaum int 26590a586ceaSMark Shellenbaum dbuf_spill_set_blksz(dmu_buf_t *db_fake, uint64_t blksz, dmu_tx_t *tx) 26600a586ceaSMark Shellenbaum { 26610a586ceaSMark Shellenbaum dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 2662744947dcSTom Erickson dnode_t *dn; 2663744947dcSTom Erickson 26640a586ceaSMark Shellenbaum if (db->db_blkid != DMU_SPILL_BLKID) 2665be6fd75aSMatthew Ahrens return (SET_ERROR(ENOTSUP)); 26660a586ceaSMark Shellenbaum if (blksz == 0) 26670a586ceaSMark Shellenbaum blksz = SPA_MINBLOCKSIZE; 2668b5152584SMatthew Ahrens ASSERT3U(blksz, <=, spa_maxblocksize(dmu_objset_spa(db->db_objset))); 26690a586ceaSMark Shellenbaum blksz = P2ROUNDUP(blksz, SPA_MINBLOCKSIZE); 26700a586ceaSMark Shellenbaum 2671744947dcSTom Erickson DB_DNODE_ENTER(db); 2672744947dcSTom Erickson dn = DB_DNODE(db); 2673744947dcSTom Erickson rw_enter(&dn->dn_struct_rwlock, RW_WRITER); 26740a586ceaSMark Shellenbaum dbuf_new_size(db, blksz, tx); 2675744947dcSTom Erickson rw_exit(&dn->dn_struct_rwlock); 2676744947dcSTom Erickson DB_DNODE_EXIT(db); 26770a586ceaSMark Shellenbaum 26780a586ceaSMark Shellenbaum return (0); 26790a586ceaSMark Shellenbaum } 26800a586ceaSMark Shellenbaum 26810a586ceaSMark Shellenbaum void 26820a586ceaSMark Shellenbaum dbuf_rm_spill(dnode_t *dn, dmu_tx_t *tx) 26830a586ceaSMark Shellenbaum { 26840a586ceaSMark Shellenbaum dbuf_free_range(dn, DMU_SPILL_BLKID, DMU_SPILL_BLKID, tx); 2685fa9e4066Sahrens } 2686fa9e4066Sahrens 2687ea8dc4b6Seschrock #pragma weak dmu_buf_add_ref = dbuf_add_ref 2688fa9e4066Sahrens void 2689fa9e4066Sahrens dbuf_add_ref(dmu_buf_impl_t *db, void *tag) 2690fa9e4066Sahrens { 2691ea8dc4b6Seschrock int64_t holds = refcount_add(&db->db_holds, tag); 2692dcbf3bd6SGeorge Wilson ASSERT3S(holds, >, 1); 2693fa9e4066Sahrens } 2694fa9e4066Sahrens 2695e57a022bSJustin T. Gibbs #pragma weak dmu_buf_try_add_ref = dbuf_try_add_ref 2696e57a022bSJustin T. Gibbs boolean_t 2697e57a022bSJustin T. Gibbs dbuf_try_add_ref(dmu_buf_t *db_fake, objset_t *os, uint64_t obj, uint64_t blkid, 2698e57a022bSJustin T. Gibbs void *tag) 2699e57a022bSJustin T. Gibbs { 2700e57a022bSJustin T. Gibbs dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 2701e57a022bSJustin T. Gibbs dmu_buf_impl_t *found_db; 2702e57a022bSJustin T. Gibbs boolean_t result = B_FALSE; 2703e57a022bSJustin T. Gibbs 2704e57a022bSJustin T. Gibbs if (db->db_blkid == DMU_BONUS_BLKID) 2705e57a022bSJustin T. Gibbs found_db = dbuf_find_bonus(os, obj); 2706e57a022bSJustin T. Gibbs else 2707e57a022bSJustin T. Gibbs found_db = dbuf_find(os, obj, 0, blkid); 2708e57a022bSJustin T. Gibbs 2709e57a022bSJustin T. Gibbs if (found_db != NULL) { 2710e57a022bSJustin T. Gibbs if (db == found_db && dbuf_refcount(db) > db->db_dirtycnt) { 2711e57a022bSJustin T. Gibbs (void) refcount_add(&db->db_holds, tag); 2712e57a022bSJustin T. Gibbs result = B_TRUE; 2713e57a022bSJustin T. Gibbs } 2714e57a022bSJustin T. Gibbs mutex_exit(&db->db_mtx); 2715e57a022bSJustin T. Gibbs } 2716e57a022bSJustin T. Gibbs return (result); 2717e57a022bSJustin T. Gibbs } 2718e57a022bSJustin T. Gibbs 2719744947dcSTom Erickson /* 2720744947dcSTom Erickson * If you call dbuf_rele() you had better not be referencing the dnode handle 2721744947dcSTom Erickson * unless you have some other direct or indirect hold on the dnode. (An indirect 2722744947dcSTom Erickson * hold is a hold on one of the dnode's dbufs, including the bonus buffer.) 2723744947dcSTom Erickson * Without that, the dbuf_rele() could lead to a dnode_rele() followed by the 2724744947dcSTom Erickson * dnode's parent dbuf evicting its dnode handles. 2725744947dcSTom Erickson */ 2726fa9e4066Sahrens void 2727ea8dc4b6Seschrock dbuf_rele(dmu_buf_impl_t *db, void *tag) 2728fa9e4066Sahrens { 2729b24ab676SJeff Bonwick mutex_enter(&db->db_mtx); 2730b24ab676SJeff Bonwick dbuf_rele_and_unlock(db, tag); 2731b24ab676SJeff Bonwick } 2732b24ab676SJeff Bonwick 273343466aaeSMax Grossman void 273443466aaeSMax Grossman dmu_buf_rele(dmu_buf_t *db, void *tag) 273543466aaeSMax Grossman { 273643466aaeSMax Grossman dbuf_rele((dmu_buf_impl_t *)db, tag); 273743466aaeSMax Grossman } 273843466aaeSMax Grossman 2739b24ab676SJeff Bonwick /* 2740b24ab676SJeff Bonwick * dbuf_rele() for an already-locked dbuf. This is necessary to allow 2741b24ab676SJeff Bonwick * db_dirtycnt and db_holds to be updated atomically. 2742b24ab676SJeff Bonwick */ 2743b24ab676SJeff Bonwick void 2744b24ab676SJeff Bonwick dbuf_rele_and_unlock(dmu_buf_impl_t *db, void *tag) 2745b24ab676SJeff Bonwick { 2746fa9e4066Sahrens int64_t holds; 2747fa9e4066Sahrens 2748b24ab676SJeff Bonwick ASSERT(MUTEX_HELD(&db->db_mtx)); 27499c9dc39aSek110237 DBUF_VERIFY(db); 2750fa9e4066Sahrens 2751744947dcSTom Erickson /* 2752744947dcSTom Erickson * Remove the reference to the dbuf before removing its hold on the 2753744947dcSTom Erickson * dnode so we can guarantee in dnode_move() that a referenced bonus 2754744947dcSTom Erickson * buffer has a corresponding dnode hold. 2755744947dcSTom Erickson */ 2756fa9e4066Sahrens holds = refcount_remove(&db->db_holds, tag); 2757ea8dc4b6Seschrock ASSERT(holds >= 0); 2758fa9e4066Sahrens 2759c717a561Smaybee /* 2760c717a561Smaybee * We can't freeze indirects if there is a possibility that they 2761c717a561Smaybee * may be modified in the current syncing context. 2762c717a561Smaybee */ 2763dcbf3bd6SGeorge Wilson if (db->db_buf != NULL && 2764dcbf3bd6SGeorge Wilson holds == (db->db_level == 0 ? db->db_dirtycnt : 0)) { 27656b4acc8bSahrens arc_buf_freeze(db->db_buf); 2766dcbf3bd6SGeorge Wilson } 27676b4acc8bSahrens 2768fa9e4066Sahrens if (holds == db->db_dirtycnt && 2769d2058105SJustin T. Gibbs db->db_level == 0 && db->db_user_immediate_evict) 2770fa9e4066Sahrens dbuf_evict_user(db); 2771ea8dc4b6Seschrock 2772ea8dc4b6Seschrock if (holds == 0) { 27730a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 2774cd485b49SJustin T. Gibbs dnode_t *dn; 2775d2058105SJustin T. Gibbs boolean_t evict_dbuf = db->db_pending_evict; 2776cd485b49SJustin T. Gibbs 2777cd485b49SJustin T. Gibbs /* 2778cd485b49SJustin T. Gibbs * If the dnode moves here, we cannot cross this 2779cd485b49SJustin T. Gibbs * barrier until the move completes. 2780cd485b49SJustin T. Gibbs */ 2781cd485b49SJustin T. Gibbs DB_DNODE_ENTER(db); 2782cd485b49SJustin T. Gibbs 2783cd485b49SJustin T. Gibbs dn = DB_DNODE(db); 2784cd485b49SJustin T. Gibbs atomic_dec_32(&dn->dn_dbufs_count); 2785cd485b49SJustin T. Gibbs 2786cd485b49SJustin T. Gibbs /* 2787cd485b49SJustin T. Gibbs * Decrementing the dbuf count means that the bonus 2788cd485b49SJustin T. Gibbs * buffer's dnode hold is no longer discounted in 2789cd485b49SJustin T. Gibbs * dnode_move(). The dnode cannot move until after 2790d2058105SJustin T. Gibbs * the dnode_rele() below. 2791cd485b49SJustin T. Gibbs */ 2792cd485b49SJustin T. Gibbs DB_DNODE_EXIT(db); 2793cd485b49SJustin T. Gibbs 2794cd485b49SJustin T. Gibbs /* 2795cd485b49SJustin T. Gibbs * Do not reference db after its lock is dropped. 2796cd485b49SJustin T. Gibbs * Another thread may evict it. 2797cd485b49SJustin T. Gibbs */ 2798ea8dc4b6Seschrock mutex_exit(&db->db_mtx); 2799744947dcSTom Erickson 2800d2058105SJustin T. Gibbs if (evict_dbuf) 2801cd485b49SJustin T. Gibbs dnode_evict_bonus(dn); 2802d2058105SJustin T. Gibbs 2803d2058105SJustin T. Gibbs dnode_rele(dn, db); 2804ea8dc4b6Seschrock } else if (db->db_buf == NULL) { 2805ea8dc4b6Seschrock /* 2806ea8dc4b6Seschrock * This is a special case: we never associated this 2807ea8dc4b6Seschrock * dbuf with any data allocated from the ARC. 2808ea8dc4b6Seschrock */ 280982c9918fSTim Haley ASSERT(db->db_state == DB_UNCACHED || 281082c9918fSTim Haley db->db_state == DB_NOFILL); 2811dcbf3bd6SGeorge Wilson dbuf_destroy(db); 2812ea8dc4b6Seschrock } else if (arc_released(db->db_buf)) { 2813ea8dc4b6Seschrock /* 2814ea8dc4b6Seschrock * This dbuf has anonymous data associated with it. 2815ea8dc4b6Seschrock */ 2816dcbf3bd6SGeorge Wilson dbuf_destroy(db); 2817ea8dc4b6Seschrock } else { 2818dcbf3bd6SGeorge Wilson boolean_t do_arc_evict = B_FALSE; 2819dcbf3bd6SGeorge Wilson blkptr_t bp; 2820dcbf3bd6SGeorge Wilson spa_t *spa = dmu_objset_spa(db->db_objset); 28219253d63dSGeorge Wilson 2822dcbf3bd6SGeorge Wilson if (!DBUF_IS_CACHEABLE(db) && 2823dcbf3bd6SGeorge Wilson db->db_blkptr != NULL && 2824bbfa8ea8SMatthew Ahrens !BP_IS_HOLE(db->db_blkptr) && 2825bbfa8ea8SMatthew Ahrens !BP_IS_EMBEDDED(db->db_blkptr)) { 2826dcbf3bd6SGeorge Wilson do_arc_evict = B_TRUE; 2827dcbf3bd6SGeorge Wilson bp = *db->db_blkptr; 2828dcbf3bd6SGeorge Wilson } 2829dcbf3bd6SGeorge Wilson 2830dcbf3bd6SGeorge Wilson if (!DBUF_IS_CACHEABLE(db) || 2831dcbf3bd6SGeorge Wilson db->db_pending_evict) { 2832dcbf3bd6SGeorge Wilson dbuf_destroy(db); 2833dcbf3bd6SGeorge Wilson } else if (!multilist_link_active(&db->db_cache_link)) { 2834dcbf3bd6SGeorge Wilson multilist_insert(&dbuf_cache, db); 2835dcbf3bd6SGeorge Wilson (void) refcount_add_many(&dbuf_cache_size, 2836dcbf3bd6SGeorge Wilson db->db.db_size, db); 2837dcbf3bd6SGeorge Wilson mutex_exit(&db->db_mtx); 2838dcbf3bd6SGeorge Wilson 2839dcbf3bd6SGeorge Wilson dbuf_evict_notify(); 2840dcbf3bd6SGeorge Wilson } 2841dcbf3bd6SGeorge Wilson 2842dcbf3bd6SGeorge Wilson if (do_arc_evict) 2843bbfa8ea8SMatthew Ahrens arc_freed(spa, &bp); 2844bbfa8ea8SMatthew Ahrens } 2845ea8dc4b6Seschrock } else { 2846ea8dc4b6Seschrock mutex_exit(&db->db_mtx); 2847fa9e4066Sahrens } 2848dcbf3bd6SGeorge Wilson 2849fa9e4066Sahrens } 2850fa9e4066Sahrens 2851fa9e4066Sahrens #pragma weak dmu_buf_refcount = dbuf_refcount 2852fa9e4066Sahrens uint64_t 2853fa9e4066Sahrens dbuf_refcount(dmu_buf_impl_t *db) 2854fa9e4066Sahrens { 2855fa9e4066Sahrens return (refcount_count(&db->db_holds)); 2856fa9e4066Sahrens } 2857fa9e4066Sahrens 2858fa9e4066Sahrens void * 2859bc9014e6SJustin Gibbs dmu_buf_replace_user(dmu_buf_t *db_fake, dmu_buf_user_t *old_user, 2860bc9014e6SJustin Gibbs dmu_buf_user_t *new_user) 2861fa9e4066Sahrens { 2862bc9014e6SJustin Gibbs dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 2863bc9014e6SJustin Gibbs 2864bc9014e6SJustin Gibbs mutex_enter(&db->db_mtx); 2865bc9014e6SJustin Gibbs dbuf_verify_user(db, DBVU_NOT_EVICTING); 2866bc9014e6SJustin Gibbs if (db->db_user == old_user) 2867bc9014e6SJustin Gibbs db->db_user = new_user; 2868bc9014e6SJustin Gibbs else 2869bc9014e6SJustin Gibbs old_user = db->db_user; 2870bc9014e6SJustin Gibbs dbuf_verify_user(db, DBVU_NOT_EVICTING); 2871bc9014e6SJustin Gibbs mutex_exit(&db->db_mtx); 2872bc9014e6SJustin Gibbs 2873bc9014e6SJustin Gibbs return (old_user); 2874fa9e4066Sahrens } 2875fa9e4066Sahrens 2876fa9e4066Sahrens void * 2877bc9014e6SJustin Gibbs dmu_buf_set_user(dmu_buf_t *db_fake, dmu_buf_user_t *user) 2878bc9014e6SJustin Gibbs { 2879bc9014e6SJustin Gibbs return (dmu_buf_replace_user(db_fake, NULL, user)); 2880bc9014e6SJustin Gibbs } 2881bc9014e6SJustin Gibbs 2882bc9014e6SJustin Gibbs void * 2883bc9014e6SJustin Gibbs dmu_buf_set_user_ie(dmu_buf_t *db_fake, dmu_buf_user_t *user) 2884fa9e4066Sahrens { 2885fa9e4066Sahrens dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 2886fa9e4066Sahrens 2887d2058105SJustin T. Gibbs db->db_user_immediate_evict = TRUE; 2888bc9014e6SJustin Gibbs return (dmu_buf_set_user(db_fake, user)); 2889fa9e4066Sahrens } 2890fa9e4066Sahrens 2891fa9e4066Sahrens void * 2892bc9014e6SJustin Gibbs dmu_buf_remove_user(dmu_buf_t *db_fake, dmu_buf_user_t *user) 2893fa9e4066Sahrens { 2894bc9014e6SJustin Gibbs return (dmu_buf_replace_user(db_fake, user, NULL)); 2895fa9e4066Sahrens } 2896fa9e4066Sahrens 2897fa9e4066Sahrens void * 2898fa9e4066Sahrens dmu_buf_get_user(dmu_buf_t *db_fake) 2899fa9e4066Sahrens { 2900fa9e4066Sahrens dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 2901fa9e4066Sahrens 2902bc9014e6SJustin Gibbs dbuf_verify_user(db, DBVU_NOT_EVICTING); 2903bc9014e6SJustin Gibbs return (db->db_user); 2904bc9014e6SJustin Gibbs } 2905bc9014e6SJustin Gibbs 2906bc9014e6SJustin Gibbs void 2907bc9014e6SJustin Gibbs dmu_buf_user_evict_wait() 2908bc9014e6SJustin Gibbs { 2909bc9014e6SJustin Gibbs taskq_wait(dbu_evict_taskq); 2910fa9e4066Sahrens } 2911fa9e4066Sahrens 29123d692628SSanjeev Bagewadi boolean_t 29133d692628SSanjeev Bagewadi dmu_buf_freeable(dmu_buf_t *dbuf) 29143d692628SSanjeev Bagewadi { 29153d692628SSanjeev Bagewadi boolean_t res = B_FALSE; 29163d692628SSanjeev Bagewadi dmu_buf_impl_t *db = (dmu_buf_impl_t *)dbuf; 29173d692628SSanjeev Bagewadi 29183d692628SSanjeev Bagewadi if (db->db_blkptr) 29193d692628SSanjeev Bagewadi res = dsl_dataset_block_freeable(db->db_objset->os_dsl_dataset, 2920c7cd2421SGeorge Wilson db->db_blkptr, db->db_blkptr->blk_birth); 29213d692628SSanjeev Bagewadi 29223d692628SSanjeev Bagewadi return (res); 29233d692628SSanjeev Bagewadi } 29243d692628SSanjeev Bagewadi 292580901aeaSGeorge Wilson blkptr_t * 292680901aeaSGeorge Wilson dmu_buf_get_blkptr(dmu_buf_t *db) 292780901aeaSGeorge Wilson { 292880901aeaSGeorge Wilson dmu_buf_impl_t *dbi = (dmu_buf_impl_t *)db; 292980901aeaSGeorge Wilson return (dbi->db_blkptr); 293080901aeaSGeorge Wilson } 293180901aeaSGeorge Wilson 2932ae972795SMatthew Ahrens objset_t * 2933ae972795SMatthew Ahrens dmu_buf_get_objset(dmu_buf_t *db) 2934ae972795SMatthew Ahrens { 2935ae972795SMatthew Ahrens dmu_buf_impl_t *dbi = (dmu_buf_impl_t *)db; 2936ae972795SMatthew Ahrens return (dbi->db_objset); 2937ae972795SMatthew Ahrens } 2938ae972795SMatthew Ahrens 293979d72832SMatthew Ahrens dnode_t * 294079d72832SMatthew Ahrens dmu_buf_dnode_enter(dmu_buf_t *db) 294179d72832SMatthew Ahrens { 294279d72832SMatthew Ahrens dmu_buf_impl_t *dbi = (dmu_buf_impl_t *)db; 294379d72832SMatthew Ahrens DB_DNODE_ENTER(dbi); 294479d72832SMatthew Ahrens return (DB_DNODE(dbi)); 294579d72832SMatthew Ahrens } 294679d72832SMatthew Ahrens 294779d72832SMatthew Ahrens void 294879d72832SMatthew Ahrens dmu_buf_dnode_exit(dmu_buf_t *db) 294979d72832SMatthew Ahrens { 295079d72832SMatthew Ahrens dmu_buf_impl_t *dbi = (dmu_buf_impl_t *)db; 295179d72832SMatthew Ahrens DB_DNODE_EXIT(dbi); 295279d72832SMatthew Ahrens } 295379d72832SMatthew Ahrens 2954c717a561Smaybee static void 2955c717a561Smaybee dbuf_check_blkptr(dnode_t *dn, dmu_buf_impl_t *db) 2956fa9e4066Sahrens { 2957c717a561Smaybee /* ASSERT(dmu_tx_is_syncing(tx) */ 2958c717a561Smaybee ASSERT(MUTEX_HELD(&db->db_mtx)); 2959c717a561Smaybee 2960c717a561Smaybee if (db->db_blkptr != NULL) 2961c717a561Smaybee return; 2962c717a561Smaybee 29630a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) { 29640a586ceaSMark Shellenbaum db->db_blkptr = &dn->dn_phys->dn_spill; 29650a586ceaSMark Shellenbaum BP_ZERO(db->db_blkptr); 29660a586ceaSMark Shellenbaum return; 29670a586ceaSMark Shellenbaum } 2968c717a561Smaybee if (db->db_level == dn->dn_phys->dn_nlevels-1) { 2969c717a561Smaybee /* 2970c717a561Smaybee * This buffer was allocated at a time when there was 2971c717a561Smaybee * no available blkptrs from the dnode, or it was 2972c717a561Smaybee * inappropriate to hook it in (i.e., nlevels mis-match). 2973c717a561Smaybee */ 2974c717a561Smaybee ASSERT(db->db_blkid < dn->dn_phys->dn_nblkptr); 2975c717a561Smaybee ASSERT(db->db_parent == NULL); 2976c717a561Smaybee db->db_parent = dn->dn_dbuf; 2977c717a561Smaybee db->db_blkptr = &dn->dn_phys->dn_blkptr[db->db_blkid]; 2978c717a561Smaybee DBUF_VERIFY(db); 2979c717a561Smaybee } else { 2980c717a561Smaybee dmu_buf_impl_t *parent = db->db_parent; 2981c717a561Smaybee int epbs = dn->dn_phys->dn_indblkshift - SPA_BLKPTRSHIFT; 2982c717a561Smaybee 2983c717a561Smaybee ASSERT(dn->dn_phys->dn_nlevels > 1); 2984c717a561Smaybee if (parent == NULL) { 2985c717a561Smaybee mutex_exit(&db->db_mtx); 2986c717a561Smaybee rw_enter(&dn->dn_struct_rwlock, RW_READER); 2987a2cdcdd2SPaul Dagnelie parent = dbuf_hold_level(dn, db->db_level + 1, 2988a2cdcdd2SPaul Dagnelie db->db_blkid >> epbs, db); 2989c717a561Smaybee rw_exit(&dn->dn_struct_rwlock); 2990c717a561Smaybee mutex_enter(&db->db_mtx); 2991c717a561Smaybee db->db_parent = parent; 2992c717a561Smaybee } 2993c717a561Smaybee db->db_blkptr = (blkptr_t *)parent->db.db_data + 2994c717a561Smaybee (db->db_blkid & ((1ULL << epbs) - 1)); 2995c717a561Smaybee DBUF_VERIFY(db); 2996c717a561Smaybee } 2997c717a561Smaybee } 2998c717a561Smaybee 2999c717a561Smaybee static void 3000c717a561Smaybee dbuf_sync_indirect(dbuf_dirty_record_t *dr, dmu_tx_t *tx) 3001c717a561Smaybee { 3002c717a561Smaybee dmu_buf_impl_t *db = dr->dr_dbuf; 3003744947dcSTom Erickson dnode_t *dn; 3004c717a561Smaybee zio_t *zio; 3005c717a561Smaybee 3006c717a561Smaybee ASSERT(dmu_tx_is_syncing(tx)); 3007c717a561Smaybee 3008c717a561Smaybee dprintf_dbuf_bp(db, db->db_blkptr, "blkptr=%p", db->db_blkptr); 3009c717a561Smaybee 3010c717a561Smaybee mutex_enter(&db->db_mtx); 3011c717a561Smaybee 3012c717a561Smaybee ASSERT(db->db_level > 0); 3013c717a561Smaybee DBUF_VERIFY(db); 3014c717a561Smaybee 30153e30c24aSWill Andrews /* Read the block if it hasn't been read yet. */ 3016c717a561Smaybee if (db->db_buf == NULL) { 3017c717a561Smaybee mutex_exit(&db->db_mtx); 3018c717a561Smaybee (void) dbuf_read(db, NULL, DB_RF_MUST_SUCCEED); 3019c717a561Smaybee mutex_enter(&db->db_mtx); 3020c717a561Smaybee } 3021c717a561Smaybee ASSERT3U(db->db_state, ==, DB_CACHED); 3022c717a561Smaybee ASSERT(db->db_buf != NULL); 3023c717a561Smaybee 3024744947dcSTom Erickson DB_DNODE_ENTER(db); 3025744947dcSTom Erickson dn = DB_DNODE(db); 30263e30c24aSWill Andrews /* Indirect block size must match what the dnode thinks it is. */ 3027744947dcSTom Erickson ASSERT3U(db->db.db_size, ==, 1<<dn->dn_phys->dn_indblkshift); 3028c717a561Smaybee dbuf_check_blkptr(dn, db); 3029744947dcSTom Erickson DB_DNODE_EXIT(db); 3030c717a561Smaybee 30313e30c24aSWill Andrews /* Provide the pending dirty record to child dbufs */ 3032c717a561Smaybee db->db_data_pending = dr; 3033c717a561Smaybee 3034af2c4821Smaybee mutex_exit(&db->db_mtx); 3035088f3894Sahrens dbuf_write(dr, db->db_buf, tx); 3036c717a561Smaybee 3037c717a561Smaybee zio = dr->dr_zio; 3038c717a561Smaybee mutex_enter(&dr->dt.di.dr_mtx); 303946e1baa6SMatthew Ahrens dbuf_sync_list(&dr->dt.di.dr_children, db->db_level - 1, tx); 3040c717a561Smaybee ASSERT(list_head(&dr->dt.di.dr_children) == NULL); 3041c717a561Smaybee mutex_exit(&dr->dt.di.dr_mtx); 3042c717a561Smaybee zio_nowait(zio); 3043c717a561Smaybee } 3044c717a561Smaybee 3045c717a561Smaybee static void 3046c717a561Smaybee dbuf_sync_leaf(dbuf_dirty_record_t *dr, dmu_tx_t *tx) 3047c717a561Smaybee { 3048c717a561Smaybee arc_buf_t **datap = &dr->dt.dl.dr_data; 3049c717a561Smaybee dmu_buf_impl_t *db = dr->dr_dbuf; 3050744947dcSTom Erickson dnode_t *dn; 3051744947dcSTom Erickson objset_t *os; 3052c717a561Smaybee uint64_t txg = tx->tx_txg; 3053fa9e4066Sahrens 3054fa9e4066Sahrens ASSERT(dmu_tx_is_syncing(tx)); 3055fa9e4066Sahrens 3056fa9e4066Sahrens dprintf_dbuf_bp(db, db->db_blkptr, "blkptr=%p", db->db_blkptr); 3057fa9e4066Sahrens 3058fa9e4066Sahrens mutex_enter(&db->db_mtx); 3059fa9e4066Sahrens /* 3060fa9e4066Sahrens * To be synced, we must be dirtied. But we 3061fa9e4066Sahrens * might have been freed after the dirty. 3062fa9e4066Sahrens */ 3063fa9e4066Sahrens if (db->db_state == DB_UNCACHED) { 3064fa9e4066Sahrens /* This buffer has been freed since it was dirtied */ 3065fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 3066fa9e4066Sahrens } else if (db->db_state == DB_FILL) { 3067fa9e4066Sahrens /* This buffer was freed and is now being re-filled */ 3068c717a561Smaybee ASSERT(db->db.db_data != dr->dt.dl.dr_data); 3069fa9e4066Sahrens } else { 307082c9918fSTim Haley ASSERT(db->db_state == DB_CACHED || db->db_state == DB_NOFILL); 3071fa9e4066Sahrens } 30729c9dc39aSek110237 DBUF_VERIFY(db); 3073fa9e4066Sahrens 3074744947dcSTom Erickson DB_DNODE_ENTER(db); 3075744947dcSTom Erickson dn = DB_DNODE(db); 3076744947dcSTom Erickson 30770a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) { 30780a586ceaSMark Shellenbaum mutex_enter(&dn->dn_mtx); 30790a586ceaSMark Shellenbaum dn->dn_phys->dn_flags |= DNODE_FLAG_SPILL_BLKPTR; 30800a586ceaSMark Shellenbaum mutex_exit(&dn->dn_mtx); 30810a586ceaSMark Shellenbaum } 30820a586ceaSMark Shellenbaum 3083fa9e4066Sahrens /* 3084c717a561Smaybee * If this is a bonus buffer, simply copy the bonus data into the 3085c717a561Smaybee * dnode. It will be written out when the dnode is synced (and it 3086c717a561Smaybee * will be synced, since it must have been dirty for dbuf_sync to 3087c717a561Smaybee * be called). 3088fa9e4066Sahrens */ 30890a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 3090c717a561Smaybee dbuf_dirty_record_t **drp; 30911934e92fSmaybee 3092ea8dc4b6Seschrock ASSERT(*datap != NULL); 3093fb09f5aaSMadhav Suresh ASSERT0(db->db_level); 3094ea8dc4b6Seschrock ASSERT3U(dn->dn_phys->dn_bonuslen, <=, DN_MAX_BONUSLEN); 3095ea8dc4b6Seschrock bcopy(*datap, DN_BONUS(dn->dn_phys), dn->dn_phys->dn_bonuslen); 3096744947dcSTom Erickson DB_DNODE_EXIT(db); 3097744947dcSTom Erickson 30980e8c6158Smaybee if (*datap != db->db.db_data) { 3099ea8dc4b6Seschrock zio_buf_free(*datap, DN_MAX_BONUSLEN); 31005a98e54bSBrendan Gregg - Sun Microsystems arc_space_return(DN_MAX_BONUSLEN, ARC_SPACE_OTHER); 31010e8c6158Smaybee } 3102ea8dc4b6Seschrock db->db_data_pending = NULL; 3103c717a561Smaybee drp = &db->db_last_dirty; 3104c717a561Smaybee while (*drp != dr) 3105c717a561Smaybee drp = &(*drp)->dr_next; 310617f17c2dSbonwick ASSERT(dr->dr_next == NULL); 3107b24ab676SJeff Bonwick ASSERT(dr->dr_dbuf == db); 310817f17c2dSbonwick *drp = dr->dr_next; 3109c717a561Smaybee kmem_free(dr, sizeof (dbuf_dirty_record_t)); 3110ea8dc4b6Seschrock ASSERT(db->db_dirtycnt > 0); 3111ea8dc4b6Seschrock db->db_dirtycnt -= 1; 3112b24ab676SJeff Bonwick dbuf_rele_and_unlock(db, (void *)(uintptr_t)txg); 3113ea8dc4b6Seschrock return; 3114ea8dc4b6Seschrock } 3115ea8dc4b6Seschrock 3116744947dcSTom Erickson os = dn->dn_objset; 3117744947dcSTom Erickson 3118c5c6ffa0Smaybee /* 3119f82bfe17Sgw25295 * This function may have dropped the db_mtx lock allowing a dmu_sync 3120f82bfe17Sgw25295 * operation to sneak in. As a result, we need to ensure that we 3121f82bfe17Sgw25295 * don't check the dr_override_state until we have returned from 3122f82bfe17Sgw25295 * dbuf_check_blkptr. 3123f82bfe17Sgw25295 */ 3124f82bfe17Sgw25295 dbuf_check_blkptr(dn, db); 3125f82bfe17Sgw25295 3126f82bfe17Sgw25295 /* 3127744947dcSTom Erickson * If this buffer is in the middle of an immediate write, 3128c717a561Smaybee * wait for the synchronous IO to complete. 3129c5c6ffa0Smaybee */ 3130c717a561Smaybee while (dr->dt.dl.dr_override_state == DR_IN_DMU_SYNC) { 3131c5c6ffa0Smaybee ASSERT(dn->dn_object != DMU_META_DNODE_OBJECT); 3132c5c6ffa0Smaybee cv_wait(&db->db_changed, &db->db_mtx); 3133c717a561Smaybee ASSERT(dr->dt.dl.dr_override_state != DR_NOT_OVERRIDDEN); 3134c5c6ffa0Smaybee } 3135c717a561Smaybee 3136ab69d62fSMatthew Ahrens if (db->db_state != DB_NOFILL && 3137ab69d62fSMatthew Ahrens dn->dn_object != DMU_META_DNODE_OBJECT && 3138ab69d62fSMatthew Ahrens refcount_count(&db->db_holds) > 1 && 3139b24ab676SJeff Bonwick dr->dt.dl.dr_override_state != DR_OVERRIDDEN && 3140ab69d62fSMatthew Ahrens *datap == db->db_buf) { 3141fa9e4066Sahrens /* 314282c9918fSTim Haley * If this buffer is currently "in use" (i.e., there 314382c9918fSTim Haley * are active holds and db_data still references it), 314482c9918fSTim Haley * then make a copy before we start the write so that 314582c9918fSTim Haley * any modifications from the open txg will not leak 314682c9918fSTim Haley * into this write. 3147fa9e4066Sahrens * 314882c9918fSTim Haley * NOTE: this copy does not need to be made for 314982c9918fSTim Haley * objects only modified in the syncing context (e.g. 315082c9918fSTim Haley * DNONE_DNODE blocks). 3151fa9e4066Sahrens */ 31525602294fSDan Kimmel int psize = arc_buf_size(*datap); 3153ab69d62fSMatthew Ahrens arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 31545602294fSDan Kimmel enum zio_compress compress_type = arc_get_compression(*datap); 31555602294fSDan Kimmel 31565602294fSDan Kimmel if (compress_type == ZIO_COMPRESS_OFF) { 31575602294fSDan Kimmel *datap = arc_alloc_buf(os->os_spa, db, type, psize); 31585602294fSDan Kimmel } else { 31595602294fSDan Kimmel ASSERT3U(type, ==, ARC_BUFC_DATA); 31605602294fSDan Kimmel int lsize = arc_buf_lsize(*datap); 31615602294fSDan Kimmel *datap = arc_alloc_compressed_buf(os->os_spa, db, 31625602294fSDan Kimmel psize, lsize, compress_type); 31635602294fSDan Kimmel } 31645602294fSDan Kimmel bcopy(db->db.db_data, (*datap)->b_data, psize); 3165fa9e4066Sahrens } 3166c717a561Smaybee db->db_data_pending = dr; 3167fa9e4066Sahrens 3168fa9e4066Sahrens mutex_exit(&db->db_mtx); 3169fa9e4066Sahrens 3170088f3894Sahrens dbuf_write(dr, *datap, tx); 3171c717a561Smaybee 3172c717a561Smaybee ASSERT(!list_link_active(&dr->dr_dirty_node)); 3173744947dcSTom Erickson if (dn->dn_object == DMU_META_DNODE_OBJECT) { 3174c717a561Smaybee list_insert_tail(&dn->dn_dirty_records[txg&TXG_MASK], dr); 3175744947dcSTom Erickson DB_DNODE_EXIT(db); 3176744947dcSTom Erickson } else { 3177744947dcSTom Erickson /* 3178744947dcSTom Erickson * Although zio_nowait() does not "wait for an IO", it does 3179744947dcSTom Erickson * initiate the IO. If this is an empty write it seems plausible 3180744947dcSTom Erickson * that the IO could actually be completed before the nowait 3181744947dcSTom Erickson * returns. We need to DB_DNODE_EXIT() first in case 3182744947dcSTom Erickson * zio_nowait() invalidates the dbuf. 3183744947dcSTom Erickson */ 3184744947dcSTom Erickson DB_DNODE_EXIT(db); 3185c717a561Smaybee zio_nowait(dr->dr_zio); 3186fa9e4066Sahrens } 3187744947dcSTom Erickson } 3188c717a561Smaybee 3189c717a561Smaybee void 319046e1baa6SMatthew Ahrens dbuf_sync_list(list_t *list, int level, dmu_tx_t *tx) 3191c717a561Smaybee { 3192c717a561Smaybee dbuf_dirty_record_t *dr; 3193c717a561Smaybee 3194c717a561Smaybee while (dr = list_head(list)) { 3195c717a561Smaybee if (dr->dr_zio != NULL) { 3196c717a561Smaybee /* 3197c717a561Smaybee * If we find an already initialized zio then we 3198c717a561Smaybee * are processing the meta-dnode, and we have finished. 3199c717a561Smaybee * The dbufs for all dnodes are put back on the list 3200c717a561Smaybee * during processing, so that we can zio_wait() 3201c717a561Smaybee * these IOs after initiating all child IOs. 3202c717a561Smaybee */ 3203c717a561Smaybee ASSERT3U(dr->dr_dbuf->db.db_object, ==, 3204c717a561Smaybee DMU_META_DNODE_OBJECT); 3205c717a561Smaybee break; 3206fa9e4066Sahrens } 320746e1baa6SMatthew Ahrens if (dr->dr_dbuf->db_blkid != DMU_BONUS_BLKID && 320846e1baa6SMatthew Ahrens dr->dr_dbuf->db_blkid != DMU_SPILL_BLKID) { 320946e1baa6SMatthew Ahrens VERIFY3U(dr->dr_dbuf->db_level, ==, level); 321046e1baa6SMatthew Ahrens } 3211c717a561Smaybee list_remove(list, dr); 3212c717a561Smaybee if (dr->dr_dbuf->db_level > 0) 3213c717a561Smaybee dbuf_sync_indirect(dr, tx); 3214c717a561Smaybee else 3215c717a561Smaybee dbuf_sync_leaf(dr, tx); 3216c717a561Smaybee } 3217c717a561Smaybee } 3218c717a561Smaybee 3219fa9e4066Sahrens /* ARGSUSED */ 3220fa9e4066Sahrens static void 3221c717a561Smaybee dbuf_write_ready(zio_t *zio, arc_buf_t *buf, void *vdb) 3222fa9e4066Sahrens { 3223fa9e4066Sahrens dmu_buf_impl_t *db = vdb; 3224744947dcSTom Erickson dnode_t *dn; 3225e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 3226c717a561Smaybee blkptr_t *bp_orig = &zio->io_bp_orig; 3227b24ab676SJeff Bonwick spa_t *spa = zio->io_spa; 3228b24ab676SJeff Bonwick int64_t delta; 3229fa9e4066Sahrens uint64_t fill = 0; 3230b24ab676SJeff Bonwick int i; 3231fa9e4066Sahrens 323211ceac77SAlex Reece ASSERT3P(db->db_blkptr, !=, NULL); 323311ceac77SAlex Reece ASSERT3P(&db->db_data_pending->dr_bp_copy, ==, bp); 3234e14bb325SJeff Bonwick 3235744947dcSTom Erickson DB_DNODE_ENTER(db); 3236744947dcSTom Erickson dn = DB_DNODE(db); 3237b24ab676SJeff Bonwick delta = bp_get_dsize_sync(spa, bp) - bp_get_dsize_sync(spa, bp_orig); 3238b24ab676SJeff Bonwick dnode_diduse_space(dn, delta - zio->io_prev_space_delta); 3239b24ab676SJeff Bonwick zio->io_prev_space_delta = delta; 3240fa9e4066Sahrens 324143466aaeSMax Grossman if (bp->blk_birth != 0) { 32420a586ceaSMark Shellenbaum ASSERT((db->db_blkid != DMU_SPILL_BLKID && 32430a586ceaSMark Shellenbaum BP_GET_TYPE(bp) == dn->dn_type) || 32440a586ceaSMark Shellenbaum (db->db_blkid == DMU_SPILL_BLKID && 32455d7b4d43SMatthew Ahrens BP_GET_TYPE(bp) == dn->dn_bonustype) || 32465d7b4d43SMatthew Ahrens BP_IS_EMBEDDED(bp)); 3247e14bb325SJeff Bonwick ASSERT(BP_GET_LEVEL(bp) == db->db_level); 324843466aaeSMax Grossman } 3249e14bb325SJeff Bonwick 3250fa9e4066Sahrens mutex_enter(&db->db_mtx); 3251fa9e4066Sahrens 32520a586ceaSMark Shellenbaum #ifdef ZFS_DEBUG 32530a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) { 32540a586ceaSMark Shellenbaum ASSERT(dn->dn_phys->dn_flags & DNODE_FLAG_SPILL_BLKPTR); 325511ceac77SAlex Reece ASSERT(!(BP_IS_HOLE(bp)) && 32560a586ceaSMark Shellenbaum db->db_blkptr == &dn->dn_phys->dn_spill); 32570a586ceaSMark Shellenbaum } 32580a586ceaSMark Shellenbaum #endif 32590a586ceaSMark Shellenbaum 3260fa9e4066Sahrens if (db->db_level == 0) { 3261fa9e4066Sahrens mutex_enter(&dn->dn_mtx); 32620a586ceaSMark Shellenbaum if (db->db_blkid > dn->dn_phys->dn_maxblkid && 32630a586ceaSMark Shellenbaum db->db_blkid != DMU_SPILL_BLKID) 3264fa9e4066Sahrens dn->dn_phys->dn_maxblkid = db->db_blkid; 3265fa9e4066Sahrens mutex_exit(&dn->dn_mtx); 3266fa9e4066Sahrens 3267fa9e4066Sahrens if (dn->dn_type == DMU_OT_DNODE) { 3268fa9e4066Sahrens dnode_phys_t *dnp = db->db.db_data; 3269fa9e4066Sahrens for (i = db->db.db_size >> DNODE_SHIFT; i > 0; 3270fa9e4066Sahrens i--, dnp++) { 3271fa9e4066Sahrens if (dnp->dn_type != DMU_OT_NONE) 3272fa9e4066Sahrens fill++; 3273fa9e4066Sahrens } 3274fa9e4066Sahrens } else { 327543466aaeSMax Grossman if (BP_IS_HOLE(bp)) { 327643466aaeSMax Grossman fill = 0; 327743466aaeSMax Grossman } else { 3278fa9e4066Sahrens fill = 1; 3279fa9e4066Sahrens } 328043466aaeSMax Grossman } 3281fa9e4066Sahrens } else { 3282e14bb325SJeff Bonwick blkptr_t *ibp = db->db.db_data; 3283fa9e4066Sahrens ASSERT3U(db->db.db_size, ==, 1<<dn->dn_phys->dn_indblkshift); 3284e14bb325SJeff Bonwick for (i = db->db.db_size >> SPA_BLKPTRSHIFT; i > 0; i--, ibp++) { 3285e14bb325SJeff Bonwick if (BP_IS_HOLE(ibp)) 3286fa9e4066Sahrens continue; 32875d7b4d43SMatthew Ahrens fill += BP_GET_FILL(ibp); 3288fa9e4066Sahrens } 3289fa9e4066Sahrens } 3290744947dcSTom Erickson DB_DNODE_EXIT(db); 3291fa9e4066Sahrens 32925d7b4d43SMatthew Ahrens if (!BP_IS_EMBEDDED(bp)) 3293e14bb325SJeff Bonwick bp->blk_fill = fill; 3294fa9e4066Sahrens 3295fa9e4066Sahrens mutex_exit(&db->db_mtx); 329611ceac77SAlex Reece 329711ceac77SAlex Reece rw_enter(&dn->dn_struct_rwlock, RW_WRITER); 329811ceac77SAlex Reece *db->db_blkptr = *bp; 329911ceac77SAlex Reece rw_exit(&dn->dn_struct_rwlock); 3300fa9e4066Sahrens } 3301fa9e4066Sahrens 33028df0bcf0SPaul Dagnelie /* ARGSUSED */ 33038df0bcf0SPaul Dagnelie /* 33048df0bcf0SPaul Dagnelie * This function gets called just prior to running through the compression 33058df0bcf0SPaul Dagnelie * stage of the zio pipeline. If we're an indirect block comprised of only 33068df0bcf0SPaul Dagnelie * holes, then we want this indirect to be compressed away to a hole. In 33078df0bcf0SPaul Dagnelie * order to do that we must zero out any information about the holes that 33088df0bcf0SPaul Dagnelie * this indirect points to prior to before we try to compress it. 33098df0bcf0SPaul Dagnelie */ 33108df0bcf0SPaul Dagnelie static void 33118df0bcf0SPaul Dagnelie dbuf_write_children_ready(zio_t *zio, arc_buf_t *buf, void *vdb) 33128df0bcf0SPaul Dagnelie { 33138df0bcf0SPaul Dagnelie dmu_buf_impl_t *db = vdb; 33148df0bcf0SPaul Dagnelie dnode_t *dn; 33158df0bcf0SPaul Dagnelie blkptr_t *bp; 3316*1a01181fSGeorge Wilson unsigned int epbs, i; 33178df0bcf0SPaul Dagnelie 33188df0bcf0SPaul Dagnelie ASSERT3U(db->db_level, >, 0); 33198df0bcf0SPaul Dagnelie DB_DNODE_ENTER(db); 33208df0bcf0SPaul Dagnelie dn = DB_DNODE(db); 33218df0bcf0SPaul Dagnelie epbs = dn->dn_phys->dn_indblkshift - SPA_BLKPTRSHIFT; 3322*1a01181fSGeorge Wilson ASSERT3U(epbs, <, 31); 33238df0bcf0SPaul Dagnelie 33248df0bcf0SPaul Dagnelie /* Determine if all our children are holes */ 33258df0bcf0SPaul Dagnelie for (i = 0, bp = db->db.db_data; i < 1 << epbs; i++, bp++) { 33268df0bcf0SPaul Dagnelie if (!BP_IS_HOLE(bp)) 33278df0bcf0SPaul Dagnelie break; 33288df0bcf0SPaul Dagnelie } 33298df0bcf0SPaul Dagnelie 33308df0bcf0SPaul Dagnelie /* 33318df0bcf0SPaul Dagnelie * If all the children are holes, then zero them all out so that 33328df0bcf0SPaul Dagnelie * we may get compressed away. 33338df0bcf0SPaul Dagnelie */ 33348df0bcf0SPaul Dagnelie if (i == 1 << epbs) { 3335*1a01181fSGeorge Wilson /* 3336*1a01181fSGeorge Wilson * We only found holes. Grab the rwlock to prevent 3337*1a01181fSGeorge Wilson * anybody from reading the blocks we're about to 3338*1a01181fSGeorge Wilson * zero out. 3339*1a01181fSGeorge Wilson */ 3340*1a01181fSGeorge Wilson rw_enter(&dn->dn_struct_rwlock, RW_WRITER); 33418df0bcf0SPaul Dagnelie bzero(db->db.db_data, db->db.db_size); 3342*1a01181fSGeorge Wilson rw_exit(&dn->dn_struct_rwlock); 33438df0bcf0SPaul Dagnelie } 33448df0bcf0SPaul Dagnelie DB_DNODE_EXIT(db); 33458df0bcf0SPaul Dagnelie } 33468df0bcf0SPaul Dagnelie 334769962b56SMatthew Ahrens /* 334869962b56SMatthew Ahrens * The SPA will call this callback several times for each zio - once 334969962b56SMatthew Ahrens * for every physical child i/o (zio->io_phys_children times). This 335069962b56SMatthew Ahrens * allows the DMU to monitor the progress of each logical i/o. For example, 335169962b56SMatthew Ahrens * there may be 2 copies of an indirect block, or many fragments of a RAID-Z 335269962b56SMatthew Ahrens * block. There may be a long delay before all copies/fragments are completed, 335369962b56SMatthew Ahrens * so this callback allows us to retire dirty space gradually, as the physical 335469962b56SMatthew Ahrens * i/os complete. 335569962b56SMatthew Ahrens */ 335669962b56SMatthew Ahrens /* ARGSUSED */ 335769962b56SMatthew Ahrens static void 335869962b56SMatthew Ahrens dbuf_write_physdone(zio_t *zio, arc_buf_t *buf, void *arg) 335969962b56SMatthew Ahrens { 336069962b56SMatthew Ahrens dmu_buf_impl_t *db = arg; 336169962b56SMatthew Ahrens objset_t *os = db->db_objset; 336269962b56SMatthew Ahrens dsl_pool_t *dp = dmu_objset_pool(os); 336369962b56SMatthew Ahrens dbuf_dirty_record_t *dr; 336469962b56SMatthew Ahrens int delta = 0; 336569962b56SMatthew Ahrens 336669962b56SMatthew Ahrens dr = db->db_data_pending; 336769962b56SMatthew Ahrens ASSERT3U(dr->dr_txg, ==, zio->io_txg); 336869962b56SMatthew Ahrens 336969962b56SMatthew Ahrens /* 337069962b56SMatthew Ahrens * The callback will be called io_phys_children times. Retire one 337169962b56SMatthew Ahrens * portion of our dirty space each time we are called. Any rounding 337269962b56SMatthew Ahrens * error will be cleaned up by dsl_pool_sync()'s call to 337369962b56SMatthew Ahrens * dsl_pool_undirty_space(). 337469962b56SMatthew Ahrens */ 337569962b56SMatthew Ahrens delta = dr->dr_accounted / zio->io_phys_children; 337669962b56SMatthew Ahrens dsl_pool_undirty_space(dp, delta, zio->io_txg); 337769962b56SMatthew Ahrens } 337869962b56SMatthew Ahrens 3379c717a561Smaybee /* ARGSUSED */ 3380c717a561Smaybee static void 3381c717a561Smaybee dbuf_write_done(zio_t *zio, arc_buf_t *buf, void *vdb) 3382c717a561Smaybee { 3383c717a561Smaybee dmu_buf_impl_t *db = vdb; 3384b24ab676SJeff Bonwick blkptr_t *bp_orig = &zio->io_bp_orig; 338543466aaeSMax Grossman blkptr_t *bp = db->db_blkptr; 338643466aaeSMax Grossman objset_t *os = db->db_objset; 338743466aaeSMax Grossman dmu_tx_t *tx = os->os_synctx; 3388c717a561Smaybee dbuf_dirty_record_t **drp, *dr; 3389c717a561Smaybee 3390fb09f5aaSMadhav Suresh ASSERT0(zio->io_error); 3391b24ab676SJeff Bonwick ASSERT(db->db_blkptr == bp); 3392b24ab676SJeff Bonwick 339380901aeaSGeorge Wilson /* 339480901aeaSGeorge Wilson * For nopwrites and rewrites we ensure that the bp matches our 339580901aeaSGeorge Wilson * original and bypass all the accounting. 339680901aeaSGeorge Wilson */ 339780901aeaSGeorge Wilson if (zio->io_flags & (ZIO_FLAG_IO_REWRITE | ZIO_FLAG_NOPWRITE)) { 3398b24ab676SJeff Bonwick ASSERT(BP_EQUAL(bp, bp_orig)); 3399b24ab676SJeff Bonwick } else { 340043466aaeSMax Grossman dsl_dataset_t *ds = os->os_dsl_dataset; 3401b24ab676SJeff Bonwick (void) dsl_dataset_block_kill(ds, bp_orig, tx, B_TRUE); 3402b24ab676SJeff Bonwick dsl_dataset_block_born(ds, bp, tx); 3403b24ab676SJeff Bonwick } 3404c717a561Smaybee 3405c717a561Smaybee mutex_enter(&db->db_mtx); 3406c717a561Smaybee 3407b24ab676SJeff Bonwick DBUF_VERIFY(db); 3408b24ab676SJeff Bonwick 3409c717a561Smaybee drp = &db->db_last_dirty; 341017f17c2dSbonwick while ((dr = *drp) != db->db_data_pending) 341117f17c2dSbonwick drp = &dr->dr_next; 341217f17c2dSbonwick ASSERT(!list_link_active(&dr->dr_dirty_node)); 3413b24ab676SJeff Bonwick ASSERT(dr->dr_dbuf == db); 341417f17c2dSbonwick ASSERT(dr->dr_next == NULL); 341517f17c2dSbonwick *drp = dr->dr_next; 3416c717a561Smaybee 34170a586ceaSMark Shellenbaum #ifdef ZFS_DEBUG 34180a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) { 3419744947dcSTom Erickson dnode_t *dn; 3420744947dcSTom Erickson 3421744947dcSTom Erickson DB_DNODE_ENTER(db); 3422744947dcSTom Erickson dn = DB_DNODE(db); 34230a586ceaSMark Shellenbaum ASSERT(dn->dn_phys->dn_flags & DNODE_FLAG_SPILL_BLKPTR); 34240a586ceaSMark Shellenbaum ASSERT(!(BP_IS_HOLE(db->db_blkptr)) && 34250a586ceaSMark Shellenbaum db->db_blkptr == &dn->dn_phys->dn_spill); 3426744947dcSTom Erickson DB_DNODE_EXIT(db); 34270a586ceaSMark Shellenbaum } 34280a586ceaSMark Shellenbaum #endif 34290a586ceaSMark Shellenbaum 3430c717a561Smaybee if (db->db_level == 0) { 34310a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 3432c717a561Smaybee ASSERT(dr->dt.dl.dr_override_state == DR_NOT_OVERRIDDEN); 343382c9918fSTim Haley if (db->db_state != DB_NOFILL) { 3434c717a561Smaybee if (dr->dt.dl.dr_data != db->db_buf) 3435dcbf3bd6SGeorge Wilson arc_buf_destroy(dr->dt.dl.dr_data, db); 343682c9918fSTim Haley } 3437c717a561Smaybee } else { 3438744947dcSTom Erickson dnode_t *dn; 3439744947dcSTom Erickson 3440744947dcSTom Erickson DB_DNODE_ENTER(db); 3441744947dcSTom Erickson dn = DB_DNODE(db); 3442c717a561Smaybee ASSERT(list_head(&dr->dt.di.dr_children) == NULL); 3443c717a561Smaybee ASSERT3U(db->db.db_size, ==, 1 << dn->dn_phys->dn_indblkshift); 3444c717a561Smaybee if (!BP_IS_HOLE(db->db_blkptr)) { 3445c717a561Smaybee int epbs = 3446c717a561Smaybee dn->dn_phys->dn_indblkshift - SPA_BLKPTRSHIFT; 344743466aaeSMax Grossman ASSERT3U(db->db_blkid, <=, 344843466aaeSMax Grossman dn->dn_phys->dn_maxblkid >> (db->db_level * epbs)); 3449c717a561Smaybee ASSERT3U(BP_GET_LSIZE(db->db_blkptr), ==, 3450c717a561Smaybee db->db.db_size); 3451c717a561Smaybee } 3452744947dcSTom Erickson DB_DNODE_EXIT(db); 3453c25056deSgw25295 mutex_destroy(&dr->dt.di.dr_mtx); 3454c25056deSgw25295 list_destroy(&dr->dt.di.dr_children); 3455c717a561Smaybee } 3456c717a561Smaybee kmem_free(dr, sizeof (dbuf_dirty_record_t)); 3457c717a561Smaybee 3458c717a561Smaybee cv_broadcast(&db->db_changed); 3459c717a561Smaybee ASSERT(db->db_dirtycnt > 0); 3460c717a561Smaybee db->db_dirtycnt -= 1; 3461c717a561Smaybee db->db_data_pending = NULL; 346243466aaeSMax Grossman dbuf_rele_and_unlock(db, (void *)(uintptr_t)tx->tx_txg); 3463b24ab676SJeff Bonwick } 3464b24ab676SJeff Bonwick 3465b24ab676SJeff Bonwick static void 3466b24ab676SJeff Bonwick dbuf_write_nofill_ready(zio_t *zio) 3467b24ab676SJeff Bonwick { 3468b24ab676SJeff Bonwick dbuf_write_ready(zio, NULL, zio->io_private); 3469b24ab676SJeff Bonwick } 3470b24ab676SJeff Bonwick 3471b24ab676SJeff Bonwick static void 3472b24ab676SJeff Bonwick dbuf_write_nofill_done(zio_t *zio) 3473b24ab676SJeff Bonwick { 3474b24ab676SJeff Bonwick dbuf_write_done(zio, NULL, zio->io_private); 3475b24ab676SJeff Bonwick } 3476b24ab676SJeff Bonwick 3477b24ab676SJeff Bonwick static void 3478b24ab676SJeff Bonwick dbuf_write_override_ready(zio_t *zio) 3479b24ab676SJeff Bonwick { 3480b24ab676SJeff Bonwick dbuf_dirty_record_t *dr = zio->io_private; 3481b24ab676SJeff Bonwick dmu_buf_impl_t *db = dr->dr_dbuf; 3482b24ab676SJeff Bonwick 3483b24ab676SJeff Bonwick dbuf_write_ready(zio, NULL, db); 3484b24ab676SJeff Bonwick } 3485b24ab676SJeff Bonwick 3486b24ab676SJeff Bonwick static void 3487b24ab676SJeff Bonwick dbuf_write_override_done(zio_t *zio) 3488b24ab676SJeff Bonwick { 3489b24ab676SJeff Bonwick dbuf_dirty_record_t *dr = zio->io_private; 3490b24ab676SJeff Bonwick dmu_buf_impl_t *db = dr->dr_dbuf; 3491b24ab676SJeff Bonwick blkptr_t *obp = &dr->dt.dl.dr_overridden_by; 3492b24ab676SJeff Bonwick 3493b24ab676SJeff Bonwick mutex_enter(&db->db_mtx); 3494b24ab676SJeff Bonwick if (!BP_EQUAL(zio->io_bp, obp)) { 3495b24ab676SJeff Bonwick if (!BP_IS_HOLE(obp)) 3496b24ab676SJeff Bonwick dsl_free(spa_get_dsl(zio->io_spa), zio->io_txg, obp); 3497b24ab676SJeff Bonwick arc_release(dr->dt.dl.dr_data, db); 3498b24ab676SJeff Bonwick } 3499c717a561Smaybee mutex_exit(&db->db_mtx); 3500c717a561Smaybee 3501b24ab676SJeff Bonwick dbuf_write_done(zio, NULL, db); 3502b24ab676SJeff Bonwick } 3503c717a561Smaybee 35043e30c24aSWill Andrews /* Issue I/O to commit a dirty buffer to disk. */ 3505b24ab676SJeff Bonwick static void 3506b24ab676SJeff Bonwick dbuf_write(dbuf_dirty_record_t *dr, arc_buf_t *data, dmu_tx_t *tx) 3507b24ab676SJeff Bonwick { 3508b24ab676SJeff Bonwick dmu_buf_impl_t *db = dr->dr_dbuf; 3509744947dcSTom Erickson dnode_t *dn; 3510744947dcSTom Erickson objset_t *os; 3511b24ab676SJeff Bonwick dmu_buf_impl_t *parent = db->db_parent; 3512b24ab676SJeff Bonwick uint64_t txg = tx->tx_txg; 35137802d7bfSMatthew Ahrens zbookmark_phys_t zb; 3514b24ab676SJeff Bonwick zio_prop_t zp; 3515b24ab676SJeff Bonwick zio_t *zio; 35160a586ceaSMark Shellenbaum int wp_flag = 0; 3517b24ab676SJeff Bonwick 351811ceac77SAlex Reece ASSERT(dmu_tx_is_syncing(tx)); 351911ceac77SAlex Reece 3520744947dcSTom Erickson DB_DNODE_ENTER(db); 3521744947dcSTom Erickson dn = DB_DNODE(db); 3522744947dcSTom Erickson os = dn->dn_objset; 3523744947dcSTom Erickson 3524b24ab676SJeff Bonwick if (db->db_state != DB_NOFILL) { 3525b24ab676SJeff Bonwick if (db->db_level > 0 || dn->dn_type == DMU_OT_DNODE) { 3526b24ab676SJeff Bonwick /* 3527b24ab676SJeff Bonwick * Private object buffers are released here rather 3528b24ab676SJeff Bonwick * than in dbuf_dirty() since they are only modified 3529b24ab676SJeff Bonwick * in the syncing context and we don't want the 3530b24ab676SJeff Bonwick * overhead of making multiple copies of the data. 3531b24ab676SJeff Bonwick */ 3532b24ab676SJeff Bonwick if (BP_IS_HOLE(db->db_blkptr)) { 3533b24ab676SJeff Bonwick arc_buf_thaw(data); 3534b24ab676SJeff Bonwick } else { 35353f9d6ad7SLin Ling dbuf_release_bp(db); 3536b24ab676SJeff Bonwick } 3537b24ab676SJeff Bonwick } 3538b24ab676SJeff Bonwick } 3539b24ab676SJeff Bonwick 3540b24ab676SJeff Bonwick if (parent != dn->dn_dbuf) { 35413e30c24aSWill Andrews /* Our parent is an indirect block. */ 35423e30c24aSWill Andrews /* We have a dirty parent that has been scheduled for write. */ 3543b24ab676SJeff Bonwick ASSERT(parent && parent->db_data_pending); 35443e30c24aSWill Andrews /* Our parent's buffer is one level closer to the dnode. */ 3545b24ab676SJeff Bonwick ASSERT(db->db_level == parent->db_level-1); 35463e30c24aSWill Andrews /* 35473e30c24aSWill Andrews * We're about to modify our parent's db_data by modifying 35483e30c24aSWill Andrews * our block pointer, so the parent must be released. 35493e30c24aSWill Andrews */ 3550b24ab676SJeff Bonwick ASSERT(arc_released(parent->db_buf)); 3551b24ab676SJeff Bonwick zio = parent->db_data_pending->dr_zio; 3552b24ab676SJeff Bonwick } else { 35533e30c24aSWill Andrews /* Our parent is the dnode itself. */ 35540a586ceaSMark Shellenbaum ASSERT((db->db_level == dn->dn_phys->dn_nlevels-1 && 35550a586ceaSMark Shellenbaum db->db_blkid != DMU_SPILL_BLKID) || 35560a586ceaSMark Shellenbaum (db->db_blkid == DMU_SPILL_BLKID && db->db_level == 0)); 35570a586ceaSMark Shellenbaum if (db->db_blkid != DMU_SPILL_BLKID) 3558b24ab676SJeff Bonwick ASSERT3P(db->db_blkptr, ==, 3559b24ab676SJeff Bonwick &dn->dn_phys->dn_blkptr[db->db_blkid]); 3560b24ab676SJeff Bonwick zio = dn->dn_zio; 3561b24ab676SJeff Bonwick } 3562b24ab676SJeff Bonwick 3563b24ab676SJeff Bonwick ASSERT(db->db_level == 0 || data == db->db_buf); 3564b24ab676SJeff Bonwick ASSERT3U(db->db_blkptr->blk_birth, <=, txg); 3565b24ab676SJeff Bonwick ASSERT(zio); 3566b24ab676SJeff Bonwick 3567b24ab676SJeff Bonwick SET_BOOKMARK(&zb, os->os_dsl_dataset ? 3568b24ab676SJeff Bonwick os->os_dsl_dataset->ds_object : DMU_META_OBJSET, 3569b24ab676SJeff Bonwick db->db.db_object, db->db_level, db->db_blkid); 3570b24ab676SJeff Bonwick 35710a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) 35720a586ceaSMark Shellenbaum wp_flag = WP_SPILL; 35730a586ceaSMark Shellenbaum wp_flag |= (db->db_state == DB_NOFILL) ? WP_NOFILL : 0; 35740a586ceaSMark Shellenbaum 35755602294fSDan Kimmel dmu_write_policy(os, dn, db->db_level, wp_flag, 35765602294fSDan Kimmel (data != NULL && arc_get_compression(data) != ZIO_COMPRESS_OFF) ? 35775602294fSDan Kimmel arc_get_compression(data) : ZIO_COMPRESS_INHERIT, &zp); 3578744947dcSTom Erickson DB_DNODE_EXIT(db); 3579b24ab676SJeff Bonwick 358011ceac77SAlex Reece /* 358111ceac77SAlex Reece * We copy the blkptr now (rather than when we instantiate the dirty 358211ceac77SAlex Reece * record), because its value can change between open context and 358311ceac77SAlex Reece * syncing context. We do not need to hold dn_struct_rwlock to read 358411ceac77SAlex Reece * db_blkptr because we are in syncing context. 358511ceac77SAlex Reece */ 358611ceac77SAlex Reece dr->dr_bp_copy = *db->db_blkptr; 358711ceac77SAlex Reece 35885d7b4d43SMatthew Ahrens if (db->db_level == 0 && 35895d7b4d43SMatthew Ahrens dr->dt.dl.dr_override_state == DR_OVERRIDDEN) { 35905d7b4d43SMatthew Ahrens /* 35915d7b4d43SMatthew Ahrens * The BP for this block has been provided by open context 35925d7b4d43SMatthew Ahrens * (by dmu_sync() or dmu_buf_write_embedded()). 35935d7b4d43SMatthew Ahrens */ 35945d7b4d43SMatthew Ahrens void *contents = (data != NULL) ? data->b_data : NULL; 35955d7b4d43SMatthew Ahrens 35965602294fSDan Kimmel dr->dr_zio = zio_write(zio, os->os_spa, txg, &dr->dr_bp_copy, 35975602294fSDan Kimmel contents, db->db.db_size, db->db.db_size, &zp, 35988df0bcf0SPaul Dagnelie dbuf_write_override_ready, NULL, NULL, 35998df0bcf0SPaul Dagnelie dbuf_write_override_done, 360069962b56SMatthew Ahrens dr, ZIO_PRIORITY_ASYNC_WRITE, ZIO_FLAG_MUSTSUCCEED, &zb); 3601b24ab676SJeff Bonwick mutex_enter(&db->db_mtx); 3602b24ab676SJeff Bonwick dr->dt.dl.dr_override_state = DR_NOT_OVERRIDDEN; 3603b24ab676SJeff Bonwick zio_write_override(dr->dr_zio, &dr->dt.dl.dr_overridden_by, 360480901aeaSGeorge Wilson dr->dt.dl.dr_copies, dr->dt.dl.dr_nopwrite); 3605b24ab676SJeff Bonwick mutex_exit(&db->db_mtx); 3606b24ab676SJeff Bonwick } else if (db->db_state == DB_NOFILL) { 3607810e43b2SBill Pijewski ASSERT(zp.zp_checksum == ZIO_CHECKSUM_OFF || 3608810e43b2SBill Pijewski zp.zp_checksum == ZIO_CHECKSUM_NOPARITY); 3609b24ab676SJeff Bonwick dr->dr_zio = zio_write(zio, os->os_spa, txg, 36105602294fSDan Kimmel &dr->dr_bp_copy, NULL, db->db.db_size, db->db.db_size, &zp, 36118df0bcf0SPaul Dagnelie dbuf_write_nofill_ready, NULL, NULL, 36128df0bcf0SPaul Dagnelie dbuf_write_nofill_done, db, 3613b24ab676SJeff Bonwick ZIO_PRIORITY_ASYNC_WRITE, 3614b24ab676SJeff Bonwick ZIO_FLAG_MUSTSUCCEED | ZIO_FLAG_NODATA, &zb); 3615b24ab676SJeff Bonwick } else { 3616b24ab676SJeff Bonwick ASSERT(arc_released(data)); 36178df0bcf0SPaul Dagnelie 36188df0bcf0SPaul Dagnelie /* 36198df0bcf0SPaul Dagnelie * For indirect blocks, we want to setup the children 36208df0bcf0SPaul Dagnelie * ready callback so that we can properly handle an indirect 36218df0bcf0SPaul Dagnelie * block that only contains holes. 36228df0bcf0SPaul Dagnelie */ 36238df0bcf0SPaul Dagnelie arc_done_func_t *children_ready_cb = NULL; 36248df0bcf0SPaul Dagnelie if (db->db_level != 0) 36258df0bcf0SPaul Dagnelie children_ready_cb = dbuf_write_children_ready; 36268df0bcf0SPaul Dagnelie 3627b24ab676SJeff Bonwick dr->dr_zio = arc_write(zio, os->os_spa, txg, 362811ceac77SAlex Reece &dr->dr_bp_copy, data, DBUF_IS_L2CACHEABLE(db), 3629dcbf3bd6SGeorge Wilson &zp, dbuf_write_ready, children_ready_cb, 363069962b56SMatthew Ahrens dbuf_write_physdone, dbuf_write_done, db, 363169962b56SMatthew Ahrens ZIO_PRIORITY_ASYNC_WRITE, ZIO_FLAG_MUSTSUCCEED, &zb); 3632b24ab676SJeff Bonwick } 3633fa9e4066Sahrens } 3634