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, 57*40510e8eSJosef 'Jeff' Sipek dmu_buf_evict_func_t *evict_func_sync, 58*40510e8eSJosef 'Jeff' Sipek dmu_buf_evict_func_t *evict_func_async, 59*40510e8eSJosef '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 /* 366*40510e8eSJosef 'Jeff' Sipek * There are two eviction callbacks - one that we call synchronously 367*40510e8eSJosef 'Jeff' Sipek * and one that we invoke via a taskq. The async one is useful for 368*40510e8eSJosef 'Jeff' Sipek * avoiding lock order reversals and limiting stack depth. 369*40510e8eSJosef 'Jeff' Sipek * 370*40510e8eSJosef 'Jeff' Sipek * Note that if we have a sync callback but no async callback, 371*40510e8eSJosef 'Jeff' Sipek * it's likely that the sync callback will free the structure 372*40510e8eSJosef 'Jeff' Sipek * containing the dbu. In that case we need to take care to not 373*40510e8eSJosef 'Jeff' Sipek * dereference dbu after calling the sync evict func. 374bc9014e6SJustin Gibbs */ 375*40510e8eSJosef 'Jeff' Sipek boolean_t has_async = (dbu->dbu_evict_func_async != NULL); 376*40510e8eSJosef 'Jeff' Sipek 377*40510e8eSJosef 'Jeff' Sipek if (dbu->dbu_evict_func_sync != NULL) 378*40510e8eSJosef 'Jeff' Sipek dbu->dbu_evict_func_sync(dbu); 379*40510e8eSJosef 'Jeff' Sipek 380*40510e8eSJosef 'Jeff' Sipek if (has_async) { 381*40510e8eSJosef 'Jeff' Sipek taskq_dispatch_ent(dbu_evict_taskq, dbu->dbu_evict_func_async, 382*40510e8eSJosef 'Jeff' Sipek dbu, 0, &dbu->dbu_tqent); 383*40510e8eSJosef '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; 413dcbf3bd6SGeorge Wilson 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); 483dcbf3bd6SGeorge Wilson 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 } 525ea8dc4b6Seschrock 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 579fa9e4066Sahrens 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 611dcbf3bd6SGeorge Wilson /* 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 618bc9014e6SJustin Gibbs /* 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 6709c9dc39aSek #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; 72188b7b0f2SMatthew Ahrens /* 72288b7b0f2SMatthew Ahrens * It should only be modified in syncing context, so 72388b7b0f2SMatthew Ahrens * make sure we only have one copy of the data. 72488b7b0f2SMatthew Ahrens */ 72588b7b0f2SMatthew Ahrens 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) 7380a586ceaSMark Shellenbaum ASSERT3P(db->db_blkptr, ==, 7390a586ceaSMark Shellenbaum &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) { 7758df0bcf0SPaul Dagnelie uint64_t *buf = db->db.db_data; 7768df0bcf0SPaul Dagnelie int i; 777fa9e4066Sahrens 7788df0bcf0SPaul Dagnelie for (i = 0; i < db->db.db_size >> 3; i++) { 7798df0bcf0SPaul Dagnelie ASSERT(buf[i] == 0); 7808df0bcf0SPaul Dagnelie } 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 } 809fa9e4066Sahrens } 810fa9e4066Sahrens } 811fa9e4066Sahrens } 812744947dcSTom Erickson DB_DNODE_EXIT(db); 813fa9e4066Sahrens } 8149c9dc39aSek #endif 815fa9e4066Sahrens 816bc9014e6SJustin Gibbs static void 817bc9014e6SJustin Gibbs dbuf_clear_data(dmu_buf_impl_t *db) 818bc9014e6SJustin Gibbs { 819bc9014e6SJustin Gibbs ASSERT(MUTEX_HELD(&db->db_mtx)); 820bc9014e6SJustin Gibbs dbuf_evict_user(db); 821dcbf3bd6SGeorge Wilson ASSERT3P(db->db_buf, ==, NULL); 822bc9014e6SJustin Gibbs db->db.db_data = NULL; 823bc9014e6SJustin Gibbs if (db->db_state != DB_NOFILL) 824bc9014e6SJustin Gibbs db->db_state = DB_UNCACHED; 825bc9014e6SJustin Gibbs } 826bc9014e6SJustin Gibbs 827fa9e4066Sahrens static void 828fa9e4066Sahrens dbuf_set_data(dmu_buf_impl_t *db, arc_buf_t *buf) 829fa9e4066Sahrens { 830fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 831bc9014e6SJustin Gibbs ASSERT(buf != NULL); 832bc9014e6SJustin Gibbs 833fa9e4066Sahrens 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); 853744947dcSTom Erickson abuf = arc_loan_buf(spa, 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 976dcbf3bd6SGeorge Wilson dbuf_set_data(db, arc_alloc_buf(db->db_objset->os_spa, 97743466aaeSMax Grossman db->db.db_size, db, type)); 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 10113baa08fcSek if (DBUF_IS_L2CACHEABLE(db)) 10127adb730bSGeorge Wilson aflags |= ARC_FLAG_L2CACHE; 10133baa08fcSek 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 1026ea8dc4b6Seschrock int 1027ea8dc4b6Seschrock dbuf_read(dmu_buf_impl_t *db, zio_t *zio, uint32_t flags) 1028fa9e4066Sahrens { 1029ea8dc4b6Seschrock int err = 0; 103043466aaeSMax Grossman boolean_t havepzio = (zio != NULL); 103143466aaeSMax Grossman boolean_t prefetch; 1032744947dcSTom Erickson dnode_t *dn; 1033fa9e4066Sahrens 1034fa9e4066Sahrens /* 1035fa9e4066Sahrens * We don't have to hold the mutex to check db_state because it 1036fa9e4066Sahrens * can't be freed while we have a hold on the buffer. 1037fa9e4066Sahrens */ 1038fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 1039fa9e4066Sahrens 104082c9918fSTim Haley if (db->db_state == DB_NOFILL) 1041be6fd75aSMatthew Ahrens return (SET_ERROR(EIO)); 104282c9918fSTim Haley 1043744947dcSTom Erickson DB_DNODE_ENTER(db); 1044744947dcSTom Erickson dn = DB_DNODE(db); 1045ea8dc4b6Seschrock if ((flags & DB_RF_HAVESTRUCT) == 0) 1046744947dcSTom Erickson rw_enter(&dn->dn_struct_rwlock, RW_READER); 1047ea8dc4b6Seschrock 10480a586ceaSMark Shellenbaum prefetch = db->db_level == 0 && db->db_blkid != DMU_BONUS_BLKID && 1049744947dcSTom Erickson (flags & DB_RF_NOPREFETCH) == 0 && dn != NULL && 10503baa08fcSek DBUF_IS_CACHEABLE(db); 105113506d1eSmaybee 1052ea8dc4b6Seschrock mutex_enter(&db->db_mtx); 1053ea8dc4b6Seschrock if (db->db_state == DB_CACHED) { 1054ea8dc4b6Seschrock mutex_exit(&db->db_mtx); 105513506d1eSmaybee if (prefetch) 1056cb92f413SAlexander Motin dmu_zfetch(&dn->dn_zfetch, db->db_blkid, 1, B_TRUE); 1057fa9e4066Sahrens if ((flags & DB_RF_HAVESTRUCT) == 0) 1058744947dcSTom Erickson rw_exit(&dn->dn_struct_rwlock); 1059744947dcSTom Erickson DB_DNODE_EXIT(db); 1060ea8dc4b6Seschrock } else if (db->db_state == DB_UNCACHED) { 1061744947dcSTom Erickson spa_t *spa = dn->dn_objset->os_spa; 1062744947dcSTom Erickson 1063744947dcSTom Erickson if (zio == NULL) 1064744947dcSTom Erickson zio = zio_root(spa, NULL, NULL, ZIO_FLAG_CANFAIL); 1065cf6106c8SMatthew Ahrens dbuf_read_impl(db, zio, flags); 106613506d1eSmaybee 1067ea8dc4b6Seschrock /* dbuf_read_impl has dropped db_mtx for us */ 1068ea8dc4b6Seschrock 106913506d1eSmaybee if (prefetch) 1070cb92f413SAlexander Motin dmu_zfetch(&dn->dn_zfetch, db->db_blkid, 1, B_TRUE); 1071ea8dc4b6Seschrock 1072fa9e4066Sahrens if ((flags & DB_RF_HAVESTRUCT) == 0) 1073744947dcSTom Erickson rw_exit(&dn->dn_struct_rwlock); 1074744947dcSTom Erickson DB_DNODE_EXIT(db); 1075fa9e4066Sahrens 1076ea8dc4b6Seschrock if (!havepzio) 1077ea8dc4b6Seschrock err = zio_wait(zio); 1078ea8dc4b6Seschrock } else { 10793e30c24aSWill Andrews /* 10803e30c24aSWill Andrews * Another reader came in while the dbuf was in flight 10813e30c24aSWill Andrews * between UNCACHED and CACHED. Either a writer will finish 10823e30c24aSWill Andrews * writing the buffer (sending the dbuf to CACHED) or the 10833e30c24aSWill Andrews * first reader's request will reach the read_done callback 10843e30c24aSWill Andrews * and send the dbuf to CACHED. Otherwise, a failure 10853e30c24aSWill Andrews * occurred and the dbuf went to UNCACHED. 10863e30c24aSWill Andrews */ 108713506d1eSmaybee mutex_exit(&db->db_mtx); 108813506d1eSmaybee if (prefetch) 1089cb92f413SAlexander Motin dmu_zfetch(&dn->dn_zfetch, db->db_blkid, 1, B_TRUE); 1090ea8dc4b6Seschrock if ((flags & DB_RF_HAVESTRUCT) == 0) 1091744947dcSTom Erickson rw_exit(&dn->dn_struct_rwlock); 1092744947dcSTom Erickson DB_DNODE_EXIT(db); 109313506d1eSmaybee 10943e30c24aSWill Andrews /* Skip the wait per the caller's request. */ 109513506d1eSmaybee mutex_enter(&db->db_mtx); 1096ea8dc4b6Seschrock if ((flags & DB_RF_NEVERWAIT) == 0) { 1097ea8dc4b6Seschrock while (db->db_state == DB_READ || 1098ea8dc4b6Seschrock db->db_state == DB_FILL) { 1099ea8dc4b6Seschrock ASSERT(db->db_state == DB_READ || 1100ea8dc4b6Seschrock (flags & DB_RF_HAVESTRUCT) == 0); 1101f6164ad6SAdam H. Leventhal DTRACE_PROBE2(blocked__read, dmu_buf_impl_t *, 1102f6164ad6SAdam H. Leventhal db, zio_t *, zio); 1103ea8dc4b6Seschrock cv_wait(&db->db_changed, &db->db_mtx); 1104ea8dc4b6Seschrock } 1105ea8dc4b6Seschrock if (db->db_state == DB_UNCACHED) 1106be6fd75aSMatthew Ahrens err = SET_ERROR(EIO); 1107ea8dc4b6Seschrock } 1108ea8dc4b6Seschrock mutex_exit(&db->db_mtx); 1109fa9e4066Sahrens } 1110fa9e4066Sahrens 1111ea8dc4b6Seschrock ASSERT(err || havepzio || db->db_state == DB_CACHED); 1112ea8dc4b6Seschrock return (err); 1113fa9e4066Sahrens } 1114fa9e4066Sahrens 1115fa9e4066Sahrens static void 1116fa9e4066Sahrens dbuf_noread(dmu_buf_impl_t *db) 1117fa9e4066Sahrens { 1118fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 11190a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 1120fa9e4066Sahrens mutex_enter(&db->db_mtx); 1121fa9e4066Sahrens while (db->db_state == DB_READ || db->db_state == DB_FILL) 1122fa9e4066Sahrens cv_wait(&db->db_changed, &db->db_mtx); 1123fa9e4066Sahrens if (db->db_state == DB_UNCACHED) { 1124ad23a2dbSjohansen arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 112543466aaeSMax Grossman spa_t *spa = db->db_objset->os_spa; 1126ad23a2dbSjohansen 1127ea8dc4b6Seschrock ASSERT(db->db_buf == NULL); 1128fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 1129dcbf3bd6SGeorge Wilson dbuf_set_data(db, arc_alloc_buf(spa, db->db.db_size, db, type)); 1130fa9e4066Sahrens db->db_state = DB_FILL; 113182c9918fSTim Haley } else if (db->db_state == DB_NOFILL) { 1132bc9014e6SJustin Gibbs dbuf_clear_data(db); 1133fa9e4066Sahrens } else { 1134fa9e4066Sahrens ASSERT3U(db->db_state, ==, DB_CACHED); 1135fa9e4066Sahrens } 1136fa9e4066Sahrens mutex_exit(&db->db_mtx); 1137fa9e4066Sahrens } 1138fa9e4066Sahrens 1139fa9e4066Sahrens /* 1140fa9e4066Sahrens * This is our just-in-time copy function. It makes a copy of 1141fa9e4066Sahrens * buffers, that have been modified in a previous transaction 1142fa9e4066Sahrens * group, before we modify them in the current active group. 1143fa9e4066Sahrens * 1144fa9e4066Sahrens * This function is used in two places: when we are dirtying a 1145fa9e4066Sahrens * buffer for the first time in a txg, and when we are freeing 1146fa9e4066Sahrens * a range in a dnode that includes this buffer. 1147fa9e4066Sahrens * 1148fa9e4066Sahrens * Note that when we are called from dbuf_free_range() we do 1149fa9e4066Sahrens * not put a hold on the buffer, we just traverse the active 1150fa9e4066Sahrens * dbuf list for the dnode. 1151fa9e4066Sahrens */ 1152fa9e4066Sahrens static void 1153fa9e4066Sahrens dbuf_fix_old_data(dmu_buf_impl_t *db, uint64_t txg) 1154fa9e4066Sahrens { 1155c717a561Smaybee dbuf_dirty_record_t *dr = db->db_last_dirty; 1156fa9e4066Sahrens 1157fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 1158fa9e4066Sahrens ASSERT(db->db.db_data != NULL); 1159c717a561Smaybee ASSERT(db->db_level == 0); 1160c717a561Smaybee ASSERT(db->db.db_object != DMU_META_DNODE_OBJECT); 1161fa9e4066Sahrens 11624d31c452Smaybee if (dr == NULL || 11634d31c452Smaybee (dr->dt.dl.dr_data != 11640a586ceaSMark Shellenbaum ((db->db_blkid == DMU_BONUS_BLKID) ? db->db.db_data : db->db_buf))) 1165fa9e4066Sahrens return; 1166fa9e4066Sahrens 1167fa9e4066Sahrens /* 1168c717a561Smaybee * If the last dirty record for this dbuf has not yet synced 1169c717a561Smaybee * and its referencing the dbuf data, either: 1170744947dcSTom Erickson * reset the reference to point to a new copy, 1171c717a561Smaybee * or (if there a no active holders) 1172c717a561Smaybee * just null out the current db_data pointer. 1173fa9e4066Sahrens */ 1174c717a561Smaybee ASSERT(dr->dr_txg >= txg - 2); 11750a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 1176c717a561Smaybee /* Note that the data bufs here are zio_bufs */ 1177c717a561Smaybee dr->dt.dl.dr_data = zio_buf_alloc(DN_MAX_BONUSLEN); 11785a98e54bSBrendan Gregg - Sun Microsystems arc_space_consume(DN_MAX_BONUSLEN, ARC_SPACE_OTHER); 1179c717a561Smaybee bcopy(db->db.db_data, dr->dt.dl.dr_data, DN_MAX_BONUSLEN); 1180c717a561Smaybee } else if (refcount_count(&db->db_holds) > db->db_dirtycnt) { 1181c717a561Smaybee int size = db->db.db_size; 1182c717a561Smaybee arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 118343466aaeSMax Grossman spa_t *spa = db->db_objset->os_spa; 1184744947dcSTom Erickson 1185dcbf3bd6SGeorge Wilson dr->dt.dl.dr_data = arc_alloc_buf(spa, size, db, type); 1186c717a561Smaybee bcopy(db->db.db_data, dr->dt.dl.dr_data->b_data, size); 1187c717a561Smaybee } else { 1188dcbf3bd6SGeorge Wilson db->db_buf = NULL; 1189bc9014e6SJustin Gibbs dbuf_clear_data(db); 1190fa9e4066Sahrens } 1191fa9e4066Sahrens } 1192fa9e4066Sahrens 1193c717a561Smaybee void 1194c717a561Smaybee dbuf_unoverride(dbuf_dirty_record_t *dr) 1195ea8dc4b6Seschrock { 1196c717a561Smaybee dmu_buf_impl_t *db = dr->dr_dbuf; 1197b24ab676SJeff Bonwick blkptr_t *bp = &dr->dt.dl.dr_overridden_by; 1198c717a561Smaybee uint64_t txg = dr->dr_txg; 1199ea8dc4b6Seschrock 1200ea8dc4b6Seschrock ASSERT(MUTEX_HELD(&db->db_mtx)); 1201c717a561Smaybee ASSERT(dr->dt.dl.dr_override_state != DR_IN_DMU_SYNC); 1202c717a561Smaybee ASSERT(db->db_level == 0); 1203ea8dc4b6Seschrock 12040a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID || 1205c717a561Smaybee dr->dt.dl.dr_override_state == DR_NOT_OVERRIDDEN) 1206c717a561Smaybee return; 1207ea8dc4b6Seschrock 1208b24ab676SJeff Bonwick ASSERT(db->db_data_pending != dr); 1209b24ab676SJeff Bonwick 1210c717a561Smaybee /* free this block */ 121143466aaeSMax Grossman if (!BP_IS_HOLE(bp) && !dr->dt.dl.dr_nopwrite) 121243466aaeSMax Grossman zio_free(db->db_objset->os_spa, txg, bp); 1213b24ab676SJeff Bonwick 1214c717a561Smaybee dr->dt.dl.dr_override_state = DR_NOT_OVERRIDDEN; 121580901aeaSGeorge Wilson dr->dt.dl.dr_nopwrite = B_FALSE; 121680901aeaSGeorge Wilson 1217c717a561Smaybee /* 1218c717a561Smaybee * Release the already-written buffer, so we leave it in 1219c717a561Smaybee * a consistent dirty state. Note that all callers are 1220c717a561Smaybee * modifying the buffer, so they will immediately do 1221c717a561Smaybee * another (redundant) arc_release(). Therefore, leave 1222c717a561Smaybee * the buf thawed to save the effort of freezing & 1223c717a561Smaybee * immediately re-thawing it. 1224c717a561Smaybee */ 1225c717a561Smaybee arc_release(dr->dt.dl.dr_data, db); 1226fa9e4066Sahrens } 1227fa9e4066Sahrens 1228cdb0ab79Smaybee /* 1229cdb0ab79Smaybee * Evict (if its unreferenced) or clear (if its referenced) any level-0 1230cdb0ab79Smaybee * data blocks in the free range, so that any future readers will find 123143466aaeSMax Grossman * empty blocks. 1232cdb0ab79Smaybee */ 1233fa9e4066Sahrens void 12340f6d88adSAlex Reece dbuf_free_range(dnode_t *dn, uint64_t start_blkid, uint64_t end_blkid, 12350f6d88adSAlex Reece dmu_tx_t *tx) 1236fa9e4066Sahrens { 1237bc9014e6SJustin Gibbs dmu_buf_impl_t db_search; 1238bc9014e6SJustin Gibbs dmu_buf_impl_t *db, *db_next; 1239fa9e4066Sahrens uint64_t txg = tx->tx_txg; 12400f6d88adSAlex Reece avl_index_t where; 1241fa9e4066Sahrens 1242653af1b8SStephen Blinick if (end_blkid > dn->dn_maxblkid && 1243653af1b8SStephen Blinick !(start_blkid == DMU_SPILL_BLKID || end_blkid == DMU_SPILL_BLKID)) 12440f6d88adSAlex Reece end_blkid = dn->dn_maxblkid; 12450f6d88adSAlex Reece dprintf_dnode(dn, "start=%llu end=%llu\n", start_blkid, end_blkid); 12460f6d88adSAlex Reece 12470f6d88adSAlex Reece db_search.db_level = 0; 12480f6d88adSAlex Reece db_search.db_blkid = start_blkid; 124986bb58aeSAlex Reece db_search.db_state = DB_SEARCH; 12502f3d8780SMatthew Ahrens 1251713d6c20SMatthew Ahrens mutex_enter(&dn->dn_dbufs_mtx); 12520f6d88adSAlex Reece db = avl_find(&dn->dn_dbufs, &db_search, &where); 12530f6d88adSAlex Reece ASSERT3P(db, ==, NULL); 1254653af1b8SStephen Blinick 12550f6d88adSAlex Reece db = avl_nearest(&dn->dn_dbufs, where, AVL_AFTER); 12560f6d88adSAlex Reece 12570f6d88adSAlex Reece for (; db != NULL; db = db_next) { 12580f6d88adSAlex Reece db_next = AVL_NEXT(&dn->dn_dbufs, db); 12590a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 1260cdb0ab79Smaybee 12610f6d88adSAlex Reece if (db->db_level != 0 || db->db_blkid > end_blkid) { 12620f6d88adSAlex Reece break; 12630f6d88adSAlex Reece } 12640f6d88adSAlex Reece ASSERT3U(db->db_blkid, >=, start_blkid); 1265fa9e4066Sahrens 1266fa9e4066Sahrens /* found a level 0 buffer in the range */ 12673b2aab18SMatthew Ahrens mutex_enter(&db->db_mtx); 12683b2aab18SMatthew Ahrens if (dbuf_undirty(db, tx)) { 12693b2aab18SMatthew Ahrens /* mutex has been dropped and dbuf destroyed */ 1270fa9e4066Sahrens continue; 12713b2aab18SMatthew Ahrens } 1272fa9e4066Sahrens 1273ea8dc4b6Seschrock if (db->db_state == DB_UNCACHED || 127482c9918fSTim Haley db->db_state == DB_NOFILL || 1275ea8dc4b6Seschrock db->db_state == DB_EVICTING) { 1276fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 1277fa9e4066Sahrens mutex_exit(&db->db_mtx); 1278fa9e4066Sahrens continue; 1279fa9e4066Sahrens } 1280c543ec06Sahrens if (db->db_state == DB_READ || db->db_state == DB_FILL) { 1281c543ec06Sahrens /* will be handled in dbuf_read_done or dbuf_rele */ 1282c717a561Smaybee db->db_freed_in_flight = TRUE; 1283fa9e4066Sahrens mutex_exit(&db->db_mtx); 1284fa9e4066Sahrens continue; 1285fa9e4066Sahrens } 1286ea8dc4b6Seschrock if (refcount_count(&db->db_holds) == 0) { 1287ea8dc4b6Seschrock ASSERT(db->db_buf); 1288dcbf3bd6SGeorge Wilson dbuf_destroy(db); 1289ea8dc4b6Seschrock continue; 1290ea8dc4b6Seschrock } 1291c717a561Smaybee /* The dbuf is referenced */ 1292fa9e4066Sahrens 1293c717a561Smaybee if (db->db_last_dirty != NULL) { 1294c717a561Smaybee dbuf_dirty_record_t *dr = db->db_last_dirty; 1295c717a561Smaybee 1296c717a561Smaybee if (dr->dr_txg == txg) { 129744eda4d7Smaybee /* 1298c717a561Smaybee * This buffer is "in-use", re-adjust the file 1299c717a561Smaybee * size to reflect that this buffer may 1300c717a561Smaybee * contain new data when we sync. 130144eda4d7Smaybee */ 130206e0070dSMark Shellenbaum if (db->db_blkid != DMU_SPILL_BLKID && 130306e0070dSMark Shellenbaum db->db_blkid > dn->dn_maxblkid) 1304c717a561Smaybee dn->dn_maxblkid = db->db_blkid; 1305c717a561Smaybee dbuf_unoverride(dr); 1306c717a561Smaybee } else { 1307c717a561Smaybee /* 1308c717a561Smaybee * This dbuf is not dirty in the open context. 1309c717a561Smaybee * Either uncache it (if its not referenced in 1310c717a561Smaybee * the open context) or reset its contents to 1311c717a561Smaybee * empty. 1312c717a561Smaybee */ 1313c717a561Smaybee dbuf_fix_old_data(db, txg); 131444eda4d7Smaybee } 1315ea8dc4b6Seschrock } 1316c717a561Smaybee /* clear the contents if its cached */ 1317ea8dc4b6Seschrock if (db->db_state == DB_CACHED) { 1318ea8dc4b6Seschrock ASSERT(db->db.db_data != NULL); 1319fa9e4066Sahrens arc_release(db->db_buf, db); 1320fa9e4066Sahrens bzero(db->db.db_data, db->db.db_size); 13216b4acc8bSahrens arc_buf_freeze(db->db_buf); 1322fa9e4066Sahrens } 1323ea8dc4b6Seschrock 1324fa9e4066Sahrens mutex_exit(&db->db_mtx); 1325fa9e4066Sahrens } 1326fa9e4066Sahrens mutex_exit(&dn->dn_dbufs_mtx); 1327fa9e4066Sahrens } 1328fa9e4066Sahrens 1329fa9e4066Sahrens static int 13301934e92fSmaybee dbuf_block_freeable(dmu_buf_impl_t *db) 1331fa9e4066Sahrens { 1332fa9e4066Sahrens dsl_dataset_t *ds = db->db_objset->os_dsl_dataset; 1333fa9e4066Sahrens uint64_t birth_txg = 0; 1334fa9e4066Sahrens 1335fa9e4066Sahrens /* 1336fa9e4066Sahrens * We don't need any locking to protect db_blkptr: 1337c717a561Smaybee * If it's syncing, then db_last_dirty will be set 1338c717a561Smaybee * so we'll ignore db_blkptr. 133943466aaeSMax Grossman * 134043466aaeSMax Grossman * This logic ensures that only block births for 134143466aaeSMax Grossman * filled blocks are considered. 1342fa9e4066Sahrens */ 1343c717a561Smaybee ASSERT(MUTEX_HELD(&db->db_mtx)); 134443466aaeSMax Grossman if (db->db_last_dirty && (db->db_blkptr == NULL || 134543466aaeSMax Grossman !BP_IS_HOLE(db->db_blkptr))) { 1346c717a561Smaybee birth_txg = db->db_last_dirty->dr_txg; 134743466aaeSMax Grossman } else if (db->db_blkptr != NULL && !BP_IS_HOLE(db->db_blkptr)) { 1348fa9e4066Sahrens birth_txg = db->db_blkptr->blk_birth; 134943466aaeSMax Grossman } 1350fa9e4066Sahrens 1351837b568bSGeorge Wilson /* 135243466aaeSMax Grossman * If this block don't exist or is in a snapshot, it can't be freed. 1353837b568bSGeorge Wilson * Don't pass the bp to dsl_dataset_block_freeable() since we 1354837b568bSGeorge Wilson * are holding the db_mtx lock and might deadlock if we are 1355837b568bSGeorge Wilson * prefetching a dedup-ed block. 1356837b568bSGeorge Wilson */ 135743466aaeSMax Grossman if (birth_txg != 0) 13581934e92fSmaybee return (ds == NULL || 1359837b568bSGeorge Wilson dsl_dataset_block_freeable(ds, NULL, birth_txg)); 1360fa9e4066Sahrens else 136143466aaeSMax Grossman return (B_FALSE); 1362fa9e4066Sahrens } 1363fa9e4066Sahrens 1364fa9e4066Sahrens void 1365fa9e4066Sahrens dbuf_new_size(dmu_buf_impl_t *db, int size, dmu_tx_t *tx) 1366fa9e4066Sahrens { 1367fa9e4066Sahrens arc_buf_t *buf, *obuf; 1368fa9e4066Sahrens int osize = db->db.db_size; 1369ad23a2dbSjohansen arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 1370744947dcSTom Erickson dnode_t *dn; 1371fa9e4066Sahrens 13720a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 1373ea8dc4b6Seschrock 1374744947dcSTom Erickson DB_DNODE_ENTER(db); 1375744947dcSTom Erickson dn = DB_DNODE(db); 1376744947dcSTom Erickson 1377fa9e4066Sahrens /* XXX does *this* func really need the lock? */ 1378744947dcSTom Erickson ASSERT(RW_WRITE_HELD(&dn->dn_struct_rwlock)); 1379fa9e4066Sahrens 1380fa9e4066Sahrens /* 138143466aaeSMax Grossman * This call to dmu_buf_will_dirty() with the dn_struct_rwlock held 1382fa9e4066Sahrens * is OK, because there can be no other references to the db 1383fa9e4066Sahrens * when we are changing its size, so no concurrent DB_FILL can 1384fa9e4066Sahrens * be happening. 1385fa9e4066Sahrens */ 1386ea8dc4b6Seschrock /* 1387ea8dc4b6Seschrock * XXX we should be doing a dbuf_read, checking the return 1388ea8dc4b6Seschrock * value and returning that up to our callers 1389ea8dc4b6Seschrock */ 139043466aaeSMax Grossman dmu_buf_will_dirty(&db->db, tx); 1391fa9e4066Sahrens 1392fa9e4066Sahrens /* create the data buffer for the new block */ 1393dcbf3bd6SGeorge Wilson buf = arc_alloc_buf(dn->dn_objset->os_spa, size, db, type); 1394fa9e4066Sahrens 1395fa9e4066Sahrens /* copy old block data to the new block */ 1396fa9e4066Sahrens obuf = db->db_buf; 1397f65e61c0Sahrens bcopy(obuf->b_data, buf->b_data, MIN(osize, size)); 1398fa9e4066Sahrens /* zero the remainder */ 1399f65e61c0Sahrens if (size > osize) 1400f65e61c0Sahrens bzero((uint8_t *)buf->b_data + osize, size - osize); 1401fa9e4066Sahrens 1402fa9e4066Sahrens mutex_enter(&db->db_mtx); 1403fa9e4066Sahrens dbuf_set_data(db, buf); 1404dcbf3bd6SGeorge Wilson arc_buf_destroy(obuf, db); 1405fa9e4066Sahrens db->db.db_size = size; 1406fa9e4066Sahrens 1407c717a561Smaybee if (db->db_level == 0) { 1408c717a561Smaybee ASSERT3U(db->db_last_dirty->dr_txg, ==, tx->tx_txg); 1409c717a561Smaybee db->db_last_dirty->dt.dl.dr_data = buf; 1410c717a561Smaybee } 1411fa9e4066Sahrens mutex_exit(&db->db_mtx); 1412fa9e4066Sahrens 1413744947dcSTom Erickson dnode_willuse_space(dn, size-osize, tx); 1414744947dcSTom Erickson DB_DNODE_EXIT(db); 1415fa9e4066Sahrens } 1416fa9e4066Sahrens 14173f9d6ad7SLin Ling void 14183f9d6ad7SLin Ling dbuf_release_bp(dmu_buf_impl_t *db) 14193f9d6ad7SLin Ling { 142043466aaeSMax Grossman objset_t *os = db->db_objset; 14213f9d6ad7SLin Ling 14223f9d6ad7SLin Ling ASSERT(dsl_pool_sync_context(dmu_objset_pool(os))); 14233f9d6ad7SLin Ling ASSERT(arc_released(os->os_phys_buf) || 14243f9d6ad7SLin Ling list_link_active(&os->os_dsl_dataset->ds_synced_link)); 14253f9d6ad7SLin Ling ASSERT(db->db_parent == NULL || arc_released(db->db_parent->db_buf)); 14263f9d6ad7SLin Ling 14271b912ec7SGeorge Wilson (void) arc_release(db->db_buf, db); 14283f9d6ad7SLin Ling } 14293f9d6ad7SLin Ling 14300f2e7d03SMatthew Ahrens /* 14310f2e7d03SMatthew Ahrens * We already have a dirty record for this TXG, and we are being 14320f2e7d03SMatthew Ahrens * dirtied again. 14330f2e7d03SMatthew Ahrens */ 14340f2e7d03SMatthew Ahrens static void 14350f2e7d03SMatthew Ahrens dbuf_redirty(dbuf_dirty_record_t *dr) 14360f2e7d03SMatthew Ahrens { 14370f2e7d03SMatthew Ahrens dmu_buf_impl_t *db = dr->dr_dbuf; 14380f2e7d03SMatthew Ahrens 14390f2e7d03SMatthew Ahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 14400f2e7d03SMatthew Ahrens 14410f2e7d03SMatthew Ahrens if (db->db_level == 0 && db->db_blkid != DMU_BONUS_BLKID) { 14420f2e7d03SMatthew Ahrens /* 14430f2e7d03SMatthew Ahrens * If this buffer has already been written out, 14440f2e7d03SMatthew Ahrens * we now need to reset its state. 14450f2e7d03SMatthew Ahrens */ 14460f2e7d03SMatthew Ahrens dbuf_unoverride(dr); 14470f2e7d03SMatthew Ahrens if (db->db.db_object != DMU_META_DNODE_OBJECT && 14480f2e7d03SMatthew Ahrens db->db_state != DB_NOFILL) { 14490f2e7d03SMatthew Ahrens /* Already released on initial dirty, so just thaw. */ 14500f2e7d03SMatthew Ahrens ASSERT(arc_released(db->db_buf)); 14510f2e7d03SMatthew Ahrens arc_buf_thaw(db->db_buf); 14520f2e7d03SMatthew Ahrens } 14530f2e7d03SMatthew Ahrens } 14540f2e7d03SMatthew Ahrens } 14550f2e7d03SMatthew Ahrens 1456c717a561Smaybee dbuf_dirty_record_t * 1457fa9e4066Sahrens dbuf_dirty(dmu_buf_impl_t *db, dmu_tx_t *tx) 1458fa9e4066Sahrens { 1459744947dcSTom Erickson dnode_t *dn; 1460744947dcSTom Erickson objset_t *os; 1461c717a561Smaybee dbuf_dirty_record_t **drp, *dr; 1462fa9e4066Sahrens int drop_struct_lock = FALSE; 1463d3469faaSMark Maybee boolean_t do_free_accounting = B_FALSE; 1464fa9e4066Sahrens int txgoff = tx->tx_txg & TXG_MASK; 1465fa9e4066Sahrens 1466fa9e4066Sahrens ASSERT(tx->tx_txg != 0); 1467fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 14689c9dc39aSek DMU_TX_DIRTY_BUF(tx, db); 1469fa9e4066Sahrens 1470744947dcSTom Erickson DB_DNODE_ENTER(db); 1471744947dcSTom Erickson dn = DB_DNODE(db); 1472fa9e4066Sahrens /* 1473fa9e4066Sahrens * Shouldn't dirty a regular buffer in syncing context. Private 1474fa9e4066Sahrens * objects may be dirtied in syncing context, but only if they 1475fa9e4066Sahrens * were already pre-dirtied in open context. 1476fa9e4066Sahrens */ 1477c166b69dSPaul Dagnelie #ifdef DEBUG 1478c166b69dSPaul Dagnelie if (dn->dn_objset->os_dsl_dataset != NULL) { 1479c166b69dSPaul Dagnelie rrw_enter(&dn->dn_objset->os_dsl_dataset->ds_bp_rwlock, 1480c166b69dSPaul Dagnelie RW_READER, FTAG); 1481c166b69dSPaul Dagnelie } 1482c717a561Smaybee ASSERT(!dmu_tx_is_syncing(tx) || 1483c717a561Smaybee BP_IS_HOLE(dn->dn_objset->os_rootbp) || 148414843421SMatthew Ahrens DMU_OBJECT_IS_SPECIAL(dn->dn_object) || 148514843421SMatthew Ahrens dn->dn_objset->os_dsl_dataset == NULL); 1486c166b69dSPaul Dagnelie if (dn->dn_objset->os_dsl_dataset != NULL) 1487c166b69dSPaul Dagnelie rrw_exit(&dn->dn_objset->os_dsl_dataset->ds_bp_rwlock, FTAG); 1488c166b69dSPaul Dagnelie #endif 1489fa9e4066Sahrens /* 1490fa9e4066Sahrens * We make this assert for private objects as well, but after we 1491fa9e4066Sahrens * check if we're already dirty. They are allowed to re-dirty 1492fa9e4066Sahrens * in syncing context. 1493fa9e4066Sahrens */ 1494ea8dc4b6Seschrock ASSERT(dn->dn_object == DMU_META_DNODE_OBJECT || 1495c717a561Smaybee dn->dn_dirtyctx == DN_UNDIRTIED || dn->dn_dirtyctx == 1496fa9e4066Sahrens (dmu_tx_is_syncing(tx) ? DN_DIRTY_SYNC : DN_DIRTY_OPEN)); 1497fa9e4066Sahrens 1498fa9e4066Sahrens mutex_enter(&db->db_mtx); 1499fa9e4066Sahrens /* 1500c717a561Smaybee * XXX make this true for indirects too? The problem is that 1501c717a561Smaybee * transactions created with dmu_tx_create_assigned() from 1502c717a561Smaybee * syncing context don't bother holding ahead. 1503fa9e4066Sahrens */ 1504c717a561Smaybee ASSERT(db->db_level != 0 || 150582c9918fSTim Haley db->db_state == DB_CACHED || db->db_state == DB_FILL || 150682c9918fSTim Haley db->db_state == DB_NOFILL); 1507fa9e4066Sahrens 1508fa9e4066Sahrens mutex_enter(&dn->dn_mtx); 1509fa9e4066Sahrens /* 1510fa9e4066Sahrens * Don't set dirtyctx to SYNC if we're just modifying this as we 1511fa9e4066Sahrens * initialize the objset. 1512fa9e4066Sahrens */ 1513c166b69dSPaul Dagnelie if (dn->dn_dirtyctx == DN_UNDIRTIED) { 1514c166b69dSPaul Dagnelie if (dn->dn_objset->os_dsl_dataset != NULL) { 1515c166b69dSPaul Dagnelie rrw_enter(&dn->dn_objset->os_dsl_dataset->ds_bp_rwlock, 1516c166b69dSPaul Dagnelie RW_READER, FTAG); 1517c166b69dSPaul Dagnelie } 1518c166b69dSPaul Dagnelie if (!BP_IS_HOLE(dn->dn_objset->os_rootbp)) { 1519c166b69dSPaul Dagnelie dn->dn_dirtyctx = (dmu_tx_is_syncing(tx) ? 1520c166b69dSPaul Dagnelie DN_DIRTY_SYNC : DN_DIRTY_OPEN); 1521c166b69dSPaul Dagnelie ASSERT(dn->dn_dirtyctx_firstset == NULL); 1522c166b69dSPaul Dagnelie dn->dn_dirtyctx_firstset = kmem_alloc(1, KM_SLEEP); 1523c166b69dSPaul Dagnelie } 1524c166b69dSPaul Dagnelie if (dn->dn_objset->os_dsl_dataset != NULL) { 1525c166b69dSPaul Dagnelie rrw_exit(&dn->dn_objset->os_dsl_dataset->ds_bp_rwlock, 1526c166b69dSPaul Dagnelie FTAG); 1527c166b69dSPaul Dagnelie } 1528fa9e4066Sahrens } 1529fa9e4066Sahrens mutex_exit(&dn->dn_mtx); 1530fa9e4066Sahrens 15310a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) 15320a586ceaSMark Shellenbaum dn->dn_have_spill = B_TRUE; 15330a586ceaSMark Shellenbaum 1534fa9e4066Sahrens /* 1535fa9e4066Sahrens * If this buffer is already dirty, we're done. 1536fa9e4066Sahrens */ 1537c717a561Smaybee drp = &db->db_last_dirty; 1538c717a561Smaybee ASSERT(*drp == NULL || (*drp)->dr_txg <= tx->tx_txg || 1539c717a561Smaybee db->db.db_object == DMU_META_DNODE_OBJECT); 15407e2186e3Sbonwick while ((dr = *drp) != NULL && dr->dr_txg > tx->tx_txg) 15417e2186e3Sbonwick drp = &dr->dr_next; 15427e2186e3Sbonwick if (dr && dr->dr_txg == tx->tx_txg) { 1543744947dcSTom Erickson DB_DNODE_EXIT(db); 1544744947dcSTom Erickson 15450f2e7d03SMatthew Ahrens dbuf_redirty(dr); 1546fa9e4066Sahrens mutex_exit(&db->db_mtx); 15477e2186e3Sbonwick return (dr); 1548fa9e4066Sahrens } 1549fa9e4066Sahrens 1550fa9e4066Sahrens /* 1551fa9e4066Sahrens * Only valid if not already dirty. 1552fa9e4066Sahrens */ 155314843421SMatthew Ahrens ASSERT(dn->dn_object == 0 || 155414843421SMatthew Ahrens dn->dn_dirtyctx == DN_UNDIRTIED || dn->dn_dirtyctx == 1555fa9e4066Sahrens (dmu_tx_is_syncing(tx) ? DN_DIRTY_SYNC : DN_DIRTY_OPEN)); 1556fa9e4066Sahrens 1557fa9e4066Sahrens ASSERT3U(dn->dn_nlevels, >, db->db_level); 1558fa9e4066Sahrens ASSERT((dn->dn_phys->dn_nlevels == 0 && db->db_level == 0) || 1559fa9e4066Sahrens dn->dn_phys->dn_nlevels > db->db_level || 1560fa9e4066Sahrens dn->dn_next_nlevels[txgoff] > db->db_level || 1561fa9e4066Sahrens dn->dn_next_nlevels[(tx->tx_txg-1) & TXG_MASK] > db->db_level || 1562fa9e4066Sahrens dn->dn_next_nlevels[(tx->tx_txg-2) & TXG_MASK] > db->db_level); 1563fa9e4066Sahrens 1564fa9e4066Sahrens /* 1565fa9e4066Sahrens * We should only be dirtying in syncing context if it's the 156614843421SMatthew Ahrens * mos or we're initializing the os or it's a special object. 156714843421SMatthew Ahrens * However, we are allowed to dirty in syncing context provided 156814843421SMatthew Ahrens * we already dirtied it in open context. Hence we must make 156914843421SMatthew Ahrens * this assertion only if we're not already dirty. 1570fa9e4066Sahrens */ 1571744947dcSTom Erickson os = dn->dn_objset; 1572c166b69dSPaul Dagnelie #ifdef DEBUG 1573c166b69dSPaul Dagnelie if (dn->dn_objset->os_dsl_dataset != NULL) 1574c166b69dSPaul Dagnelie rrw_enter(&os->os_dsl_dataset->ds_bp_rwlock, RW_READER, FTAG); 157514843421SMatthew Ahrens ASSERT(!dmu_tx_is_syncing(tx) || DMU_OBJECT_IS_SPECIAL(dn->dn_object) || 157614843421SMatthew Ahrens os->os_dsl_dataset == NULL || BP_IS_HOLE(os->os_rootbp)); 1577c166b69dSPaul Dagnelie if (dn->dn_objset->os_dsl_dataset != NULL) 1578c166b69dSPaul Dagnelie rrw_exit(&os->os_dsl_dataset->ds_bp_rwlock, FTAG); 1579c166b69dSPaul Dagnelie #endif 1580fa9e4066Sahrens ASSERT(db->db.db_size != 0); 1581fa9e4066Sahrens 1582fa9e4066Sahrens dprintf_dbuf(db, "size=%llx\n", (u_longlong_t)db->db.db_size); 1583fa9e4066Sahrens 15840a586ceaSMark Shellenbaum if (db->db_blkid != DMU_BONUS_BLKID) { 15851934e92fSmaybee /* 15861934e92fSmaybee * Update the accounting. 1587d3469faaSMark Maybee * Note: we delay "free accounting" until after we drop 1588d3469faaSMark Maybee * the db_mtx. This keeps us from grabbing other locks 1589b24ab676SJeff Bonwick * (and possibly deadlocking) in bp_get_dsize() while 1590d3469faaSMark Maybee * also holding the db_mtx. 15911934e92fSmaybee */ 15921934e92fSmaybee dnode_willuse_space(dn, db->db.db_size, tx); 1593d3469faaSMark Maybee do_free_accounting = dbuf_block_freeable(db); 15941934e92fSmaybee } 15951934e92fSmaybee 1596ea8dc4b6Seschrock /* 1597ea8dc4b6Seschrock * If this buffer is dirty in an old transaction group we need 1598ea8dc4b6Seschrock * to make a copy of it so that the changes we make in this 1599ea8dc4b6Seschrock * transaction group won't leak out when we sync the older txg. 1600ea8dc4b6Seschrock */ 1601c717a561Smaybee dr = kmem_zalloc(sizeof (dbuf_dirty_record_t), KM_SLEEP); 1602c717a561Smaybee if (db->db_level == 0) { 1603c717a561Smaybee void *data_old = db->db_buf; 1604c717a561Smaybee 160582c9918fSTim Haley if (db->db_state != DB_NOFILL) { 16060a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 160782c9918fSTim Haley dbuf_fix_old_data(db, tx->tx_txg); 160882c9918fSTim Haley data_old = db->db.db_data; 160982c9918fSTim Haley } else if (db->db.db_object != DMU_META_DNODE_OBJECT) { 161082c9918fSTim Haley /* 161182c9918fSTim Haley * Release the data buffer from the cache so 161282c9918fSTim Haley * that we can modify it without impacting 161382c9918fSTim Haley * possible other users of this cached data 161482c9918fSTim Haley * block. Note that indirect blocks and 161582c9918fSTim Haley * private objects are not released until the 161682c9918fSTim Haley * syncing state (since they are only modified 161782c9918fSTim Haley * then). 161882c9918fSTim Haley */ 161982c9918fSTim Haley arc_release(db->db_buf, db); 162082c9918fSTim Haley dbuf_fix_old_data(db, tx->tx_txg); 162182c9918fSTim Haley data_old = db->db_buf; 162282c9918fSTim Haley } 162382c9918fSTim Haley ASSERT(data_old != NULL); 1624fa9e4066Sahrens } 1625c717a561Smaybee dr->dt.dl.dr_data = data_old; 1626c717a561Smaybee } else { 1627c717a561Smaybee mutex_init(&dr->dt.di.dr_mtx, NULL, MUTEX_DEFAULT, NULL); 1628c717a561Smaybee list_create(&dr->dt.di.dr_children, 1629c717a561Smaybee sizeof (dbuf_dirty_record_t), 1630c717a561Smaybee offsetof(dbuf_dirty_record_t, dr_dirty_node)); 1631fa9e4066Sahrens } 163269962b56SMatthew Ahrens if (db->db_blkid != DMU_BONUS_BLKID && os->os_dsl_dataset != NULL) 163369962b56SMatthew Ahrens dr->dr_accounted = db->db.db_size; 1634c717a561Smaybee dr->dr_dbuf = db; 1635c717a561Smaybee dr->dr_txg = tx->tx_txg; 1636c717a561Smaybee dr->dr_next = *drp; 1637c717a561Smaybee *drp = dr; 1638fa9e4066Sahrens 1639fa9e4066Sahrens /* 1640fa9e4066Sahrens * We could have been freed_in_flight between the dbuf_noread 1641fa9e4066Sahrens * and dbuf_dirty. We win, as though the dbuf_noread() had 1642fa9e4066Sahrens * happened after the free. 1643fa9e4066Sahrens */ 16440a586ceaSMark Shellenbaum if (db->db_level == 0 && db->db_blkid != DMU_BONUS_BLKID && 16450a586ceaSMark Shellenbaum db->db_blkid != DMU_SPILL_BLKID) { 1646c717a561Smaybee mutex_enter(&dn->dn_mtx); 1647bf16b11eSMatthew Ahrens if (dn->dn_free_ranges[txgoff] != NULL) { 1648bf16b11eSMatthew Ahrens range_tree_clear(dn->dn_free_ranges[txgoff], 1649bf16b11eSMatthew Ahrens db->db_blkid, 1); 1650bf16b11eSMatthew Ahrens } 1651c717a561Smaybee mutex_exit(&dn->dn_mtx); 1652c717a561Smaybee db->db_freed_in_flight = FALSE; 1653fa9e4066Sahrens } 1654fa9e4066Sahrens 1655fa9e4066Sahrens /* 1656fa9e4066Sahrens * This buffer is now part of this txg 1657fa9e4066Sahrens */ 1658fa9e4066Sahrens dbuf_add_ref(db, (void *)(uintptr_t)tx->tx_txg); 1659fa9e4066Sahrens db->db_dirtycnt += 1; 1660fa9e4066Sahrens ASSERT3U(db->db_dirtycnt, <=, 3); 1661fa9e4066Sahrens 1662fa9e4066Sahrens mutex_exit(&db->db_mtx); 1663fa9e4066Sahrens 16640a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID || 16650a586ceaSMark Shellenbaum db->db_blkid == DMU_SPILL_BLKID) { 1666c717a561Smaybee mutex_enter(&dn->dn_mtx); 1667c717a561Smaybee ASSERT(!list_link_active(&dr->dr_dirty_node)); 1668c717a561Smaybee list_insert_tail(&dn->dn_dirty_records[txgoff], dr); 1669c717a561Smaybee mutex_exit(&dn->dn_mtx); 1670fa9e4066Sahrens dnode_setdirty(dn, tx); 1671744947dcSTom Erickson DB_DNODE_EXIT(db); 1672c717a561Smaybee return (dr); 167392654925SMatthew Ahrens } 167492654925SMatthew Ahrens 167592654925SMatthew Ahrens /* 167692654925SMatthew Ahrens * The dn_struct_rwlock prevents db_blkptr from changing 167792654925SMatthew Ahrens * due to a write from syncing context completing 167892654925SMatthew Ahrens * while we are running, so we want to acquire it before 167992654925SMatthew Ahrens * looking at db_blkptr. 168092654925SMatthew Ahrens */ 168192654925SMatthew Ahrens if (!RW_WRITE_HELD(&dn->dn_struct_rwlock)) { 168292654925SMatthew Ahrens rw_enter(&dn->dn_struct_rwlock, RW_READER); 168392654925SMatthew Ahrens drop_struct_lock = TRUE; 168492654925SMatthew Ahrens } 168592654925SMatthew Ahrens 168692654925SMatthew Ahrens if (do_free_accounting) { 1687d3469faaSMark Maybee blkptr_t *bp = db->db_blkptr; 1688d3469faaSMark Maybee int64_t willfree = (bp && !BP_IS_HOLE(bp)) ? 1689b24ab676SJeff Bonwick bp_get_dsize(os->os_spa, bp) : db->db.db_size; 1690d3469faaSMark Maybee /* 1691d3469faaSMark Maybee * This is only a guess -- if the dbuf is dirty 1692d3469faaSMark Maybee * in a previous txg, we don't know how much 1693d3469faaSMark Maybee * space it will use on disk yet. We should 1694d3469faaSMark Maybee * really have the struct_rwlock to access 1695d3469faaSMark Maybee * db_blkptr, but since this is just a guess, 1696d3469faaSMark Maybee * it's OK if we get an odd answer. 1697d3469faaSMark Maybee */ 1698837b568bSGeorge Wilson ddt_prefetch(os->os_spa, bp); 1699d3469faaSMark Maybee dnode_willuse_space(dn, -willfree, tx); 1700fa9e4066Sahrens } 1701fa9e4066Sahrens 17028346f03fSJonathan W Adams if (db->db_level == 0) { 17038346f03fSJonathan W Adams dnode_new_blkid(dn, db->db_blkid, tx, drop_struct_lock); 17048346f03fSJonathan W Adams ASSERT(dn->dn_maxblkid >= db->db_blkid); 17058346f03fSJonathan W Adams } 17068346f03fSJonathan W Adams 170744eda4d7Smaybee if (db->db_level+1 < dn->dn_nlevels) { 1708c717a561Smaybee dmu_buf_impl_t *parent = db->db_parent; 1709c717a561Smaybee dbuf_dirty_record_t *di; 1710c717a561Smaybee int parent_held = FALSE; 1711c717a561Smaybee 1712c717a561Smaybee if (db->db_parent == NULL || db->db_parent == dn->dn_dbuf) { 1713c717a561Smaybee int epbs = dn->dn_indblkshift - SPA_BLKPTRSHIFT; 1714c717a561Smaybee 1715c717a561Smaybee parent = dbuf_hold_level(dn, db->db_level+1, 1716c717a561Smaybee db->db_blkid >> epbs, FTAG); 171701025c89SJohn Harres ASSERT(parent != NULL); 1718c717a561Smaybee parent_held = TRUE; 1719c717a561Smaybee } 1720fa9e4066Sahrens if (drop_struct_lock) 1721fa9e4066Sahrens rw_exit(&dn->dn_struct_rwlock); 1722c717a561Smaybee ASSERT3U(db->db_level+1, ==, parent->db_level); 1723c717a561Smaybee di = dbuf_dirty(parent, tx); 1724c717a561Smaybee if (parent_held) 1725c717a561Smaybee dbuf_rele(parent, FTAG); 1726c717a561Smaybee 1727c717a561Smaybee mutex_enter(&db->db_mtx); 172869962b56SMatthew Ahrens /* 172969962b56SMatthew Ahrens * Since we've dropped the mutex, it's possible that 173069962b56SMatthew Ahrens * dbuf_undirty() might have changed this out from under us. 173169962b56SMatthew Ahrens */ 1732c717a561Smaybee if (db->db_last_dirty == dr || 1733c717a561Smaybee dn->dn_object == DMU_META_DNODE_OBJECT) { 1734c717a561Smaybee mutex_enter(&di->dt.di.dr_mtx); 1735c717a561Smaybee ASSERT3U(di->dr_txg, ==, tx->tx_txg); 1736c717a561Smaybee ASSERT(!list_link_active(&dr->dr_dirty_node)); 1737c717a561Smaybee list_insert_tail(&di->dt.di.dr_children, dr); 1738c717a561Smaybee mutex_exit(&di->dt.di.dr_mtx); 1739c717a561Smaybee dr->dr_parent = di; 1740c717a561Smaybee } 1741c717a561Smaybee mutex_exit(&db->db_mtx); 1742fa9e4066Sahrens } else { 1743c717a561Smaybee ASSERT(db->db_level+1 == dn->dn_nlevels); 1744c717a561Smaybee ASSERT(db->db_blkid < dn->dn_nblkptr); 1745744947dcSTom Erickson ASSERT(db->db_parent == NULL || db->db_parent == dn->dn_dbuf); 1746c717a561Smaybee mutex_enter(&dn->dn_mtx); 1747c717a561Smaybee ASSERT(!list_link_active(&dr->dr_dirty_node)); 1748c717a561Smaybee list_insert_tail(&dn->dn_dirty_records[txgoff], dr); 1749c717a561Smaybee mutex_exit(&dn->dn_mtx); 1750fa9e4066Sahrens if (drop_struct_lock) 1751fa9e4066Sahrens rw_exit(&dn->dn_struct_rwlock); 1752fa9e4066Sahrens } 1753fa9e4066Sahrens 1754fa9e4066Sahrens dnode_setdirty(dn, tx); 1755744947dcSTom Erickson DB_DNODE_EXIT(db); 1756c717a561Smaybee return (dr); 1757fa9e4066Sahrens } 1758fa9e4066Sahrens 17593b2aab18SMatthew Ahrens /* 17603e30c24aSWill Andrews * Undirty a buffer in the transaction group referenced by the given 17613e30c24aSWill Andrews * transaction. Return whether this evicted the dbuf. 17623b2aab18SMatthew Ahrens */ 17633b2aab18SMatthew Ahrens static boolean_t 1764fa9e4066Sahrens dbuf_undirty(dmu_buf_impl_t *db, dmu_tx_t *tx) 1765fa9e4066Sahrens { 1766744947dcSTom Erickson dnode_t *dn; 1767c717a561Smaybee uint64_t txg = tx->tx_txg; 176817f17c2dSbonwick dbuf_dirty_record_t *dr, **drp; 1769fa9e4066Sahrens 1770c717a561Smaybee ASSERT(txg != 0); 177146e1baa6SMatthew Ahrens 177246e1baa6SMatthew Ahrens /* 177346e1baa6SMatthew Ahrens * Due to our use of dn_nlevels below, this can only be called 177446e1baa6SMatthew Ahrens * in open context, unless we are operating on the MOS. 177546e1baa6SMatthew Ahrens * From syncing context, dn_nlevels may be different from the 177646e1baa6SMatthew Ahrens * dn_nlevels used when dbuf was dirtied. 177746e1baa6SMatthew Ahrens */ 177846e1baa6SMatthew Ahrens ASSERT(db->db_objset == 177946e1baa6SMatthew Ahrens dmu_objset_pool(db->db_objset)->dp_meta_objset || 178046e1baa6SMatthew Ahrens txg != spa_syncing_txg(dmu_objset_spa(db->db_objset))); 17810a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 17823b2aab18SMatthew Ahrens ASSERT0(db->db_level); 17833b2aab18SMatthew Ahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 1784fa9e4066Sahrens 1785fa9e4066Sahrens /* 1786fa9e4066Sahrens * If this buffer is not dirty, we're done. 1787fa9e4066Sahrens */ 178817f17c2dSbonwick for (drp = &db->db_last_dirty; (dr = *drp) != NULL; drp = &dr->dr_next) 1789c717a561Smaybee if (dr->dr_txg <= txg) 1790c717a561Smaybee break; 17913b2aab18SMatthew Ahrens if (dr == NULL || dr->dr_txg < txg) 17923b2aab18SMatthew Ahrens return (B_FALSE); 1793c717a561Smaybee ASSERT(dr->dr_txg == txg); 1794b24ab676SJeff Bonwick ASSERT(dr->dr_dbuf == db); 1795fa9e4066Sahrens 1796744947dcSTom Erickson DB_DNODE_ENTER(db); 1797744947dcSTom Erickson dn = DB_DNODE(db); 1798744947dcSTom Erickson 1799fa9e4066Sahrens dprintf_dbuf(db, "size=%llx\n", (u_longlong_t)db->db.db_size); 1800fa9e4066Sahrens 1801fa9e4066Sahrens ASSERT(db->db.db_size != 0); 1802fa9e4066Sahrens 180346e1baa6SMatthew Ahrens dsl_pool_undirty_space(dmu_objset_pool(dn->dn_objset), 180446e1baa6SMatthew Ahrens dr->dr_accounted, txg); 1805fa9e4066Sahrens 180617f17c2dSbonwick *drp = dr->dr_next; 1807c717a561Smaybee 18083f2366c2SGordon Ross /* 18093f2366c2SGordon Ross * Note that there are three places in dbuf_dirty() 18103f2366c2SGordon Ross * where this dirty record may be put on a list. 18113f2366c2SGordon Ross * Make sure to do a list_remove corresponding to 18123f2366c2SGordon Ross * every one of those list_insert calls. 18133f2366c2SGordon Ross */ 1814c717a561Smaybee if (dr->dr_parent) { 1815c717a561Smaybee mutex_enter(&dr->dr_parent->dt.di.dr_mtx); 1816c717a561Smaybee list_remove(&dr->dr_parent->dt.di.dr_children, dr); 1817c717a561Smaybee mutex_exit(&dr->dr_parent->dt.di.dr_mtx); 18183f2366c2SGordon Ross } else if (db->db_blkid == DMU_SPILL_BLKID || 181946e1baa6SMatthew Ahrens db->db_level + 1 == dn->dn_nlevels) { 1820cdb0ab79Smaybee ASSERT(db->db_blkptr == NULL || db->db_parent == dn->dn_dbuf); 1821c717a561Smaybee mutex_enter(&dn->dn_mtx); 1822c717a561Smaybee list_remove(&dn->dn_dirty_records[txg & TXG_MASK], dr); 1823c717a561Smaybee mutex_exit(&dn->dn_mtx); 1824c717a561Smaybee } 1825744947dcSTom Erickson DB_DNODE_EXIT(db); 1826c717a561Smaybee 18273b2aab18SMatthew Ahrens if (db->db_state != DB_NOFILL) { 18283b2aab18SMatthew Ahrens dbuf_unoverride(dr); 1829c717a561Smaybee 1830c717a561Smaybee ASSERT(db->db_buf != NULL); 18313b2aab18SMatthew Ahrens ASSERT(dr->dt.dl.dr_data != NULL); 18323b2aab18SMatthew Ahrens if (dr->dt.dl.dr_data != db->db_buf) 1833dcbf3bd6SGeorge Wilson arc_buf_destroy(dr->dt.dl.dr_data, db); 1834c717a561Smaybee } 1835d2b3cbbdSJorgen Lundman 1836c717a561Smaybee kmem_free(dr, sizeof (dbuf_dirty_record_t)); 1837fa9e4066Sahrens 1838fa9e4066Sahrens ASSERT(db->db_dirtycnt > 0); 1839fa9e4066Sahrens db->db_dirtycnt -= 1; 1840fa9e4066Sahrens 1841c717a561Smaybee if (refcount_remove(&db->db_holds, (void *)(uintptr_t)txg) == 0) { 1842dcbf3bd6SGeorge Wilson ASSERT(db->db_state == DB_NOFILL || arc_released(db->db_buf)); 1843dcbf3bd6SGeorge Wilson dbuf_destroy(db); 18443b2aab18SMatthew Ahrens return (B_TRUE); 1845fa9e4066Sahrens } 1846fa9e4066Sahrens 18473b2aab18SMatthew Ahrens return (B_FALSE); 1848fa9e4066Sahrens } 1849fa9e4066Sahrens 1850fa9e4066Sahrens void 185143466aaeSMax Grossman dmu_buf_will_dirty(dmu_buf_t *db_fake, dmu_tx_t *tx) 1852fa9e4066Sahrens { 185343466aaeSMax Grossman dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 18541ab7f2deSmaybee int rf = DB_RF_MUST_SUCCEED | DB_RF_NOPREFETCH; 1855fa9e4066Sahrens 1856fa9e4066Sahrens ASSERT(tx->tx_txg != 0); 1857fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 1858fa9e4066Sahrens 18590f2e7d03SMatthew Ahrens /* 18600f2e7d03SMatthew Ahrens * Quick check for dirtyness. For already dirty blocks, this 18610f2e7d03SMatthew Ahrens * reduces runtime of this function by >90%, and overall performance 18620f2e7d03SMatthew Ahrens * by 50% for some workloads (e.g. file deletion with indirect blocks 18630f2e7d03SMatthew Ahrens * cached). 18640f2e7d03SMatthew Ahrens */ 18650f2e7d03SMatthew Ahrens mutex_enter(&db->db_mtx); 18660f2e7d03SMatthew Ahrens dbuf_dirty_record_t *dr; 18670f2e7d03SMatthew Ahrens for (dr = db->db_last_dirty; 18680f2e7d03SMatthew Ahrens dr != NULL && dr->dr_txg >= tx->tx_txg; dr = dr->dr_next) { 18690f2e7d03SMatthew Ahrens /* 18700f2e7d03SMatthew Ahrens * It's possible that it is already dirty but not cached, 18710f2e7d03SMatthew Ahrens * because there are some calls to dbuf_dirty() that don't 18720f2e7d03SMatthew Ahrens * go through dmu_buf_will_dirty(). 18730f2e7d03SMatthew Ahrens */ 18740f2e7d03SMatthew Ahrens if (dr->dr_txg == tx->tx_txg && db->db_state == DB_CACHED) { 18750f2e7d03SMatthew Ahrens /* This dbuf is already dirty and cached. */ 18760f2e7d03SMatthew Ahrens dbuf_redirty(dr); 18770f2e7d03SMatthew Ahrens mutex_exit(&db->db_mtx); 18780f2e7d03SMatthew Ahrens return; 18790f2e7d03SMatthew Ahrens } 18800f2e7d03SMatthew Ahrens } 18810f2e7d03SMatthew Ahrens mutex_exit(&db->db_mtx); 18820f2e7d03SMatthew Ahrens 1883744947dcSTom Erickson DB_DNODE_ENTER(db); 1884744947dcSTom Erickson if (RW_WRITE_HELD(&DB_DNODE(db)->dn_struct_rwlock)) 1885fa9e4066Sahrens rf |= DB_RF_HAVESTRUCT; 1886744947dcSTom Erickson DB_DNODE_EXIT(db); 1887ea8dc4b6Seschrock (void) dbuf_read(db, NULL, rf); 1888c717a561Smaybee (void) dbuf_dirty(db, tx); 1889fa9e4066Sahrens } 1890fa9e4066Sahrens 189182c9918fSTim Haley void 189282c9918fSTim Haley dmu_buf_will_not_fill(dmu_buf_t *db_fake, dmu_tx_t *tx) 189382c9918fSTim Haley { 189482c9918fSTim Haley dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 189582c9918fSTim Haley 189682c9918fSTim Haley db->db_state = DB_NOFILL; 189782c9918fSTim Haley 189882c9918fSTim Haley dmu_buf_will_fill(db_fake, tx); 189982c9918fSTim Haley } 190082c9918fSTim Haley 1901fa9e4066Sahrens void 1902ea8dc4b6Seschrock dmu_buf_will_fill(dmu_buf_t *db_fake, dmu_tx_t *tx) 1903fa9e4066Sahrens { 1904ea8dc4b6Seschrock dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 1905ea8dc4b6Seschrock 19060a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 1907fa9e4066Sahrens ASSERT(tx->tx_txg != 0); 1908fa9e4066Sahrens ASSERT(db->db_level == 0); 1909fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 1910fa9e4066Sahrens 1911ea8dc4b6Seschrock ASSERT(db->db.db_object != DMU_META_DNODE_OBJECT || 1912fa9e4066Sahrens dmu_tx_private_ok(tx)); 1913fa9e4066Sahrens 1914fa9e4066Sahrens dbuf_noread(db); 1915c717a561Smaybee (void) dbuf_dirty(db, tx); 1916fa9e4066Sahrens } 1917fa9e4066Sahrens 1918fa9e4066Sahrens #pragma weak dmu_buf_fill_done = dbuf_fill_done 1919fa9e4066Sahrens /* ARGSUSED */ 1920fa9e4066Sahrens void 1921fa9e4066Sahrens dbuf_fill_done(dmu_buf_impl_t *db, dmu_tx_t *tx) 1922fa9e4066Sahrens { 1923fa9e4066Sahrens mutex_enter(&db->db_mtx); 19249c9dc39aSek DBUF_VERIFY(db); 1925fa9e4066Sahrens 1926fa9e4066Sahrens if (db->db_state == DB_FILL) { 1927c717a561Smaybee if (db->db_level == 0 && db->db_freed_in_flight) { 19280a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 1929fa9e4066Sahrens /* we were freed while filling */ 1930fa9e4066Sahrens /* XXX dbuf_undirty? */ 1931fa9e4066Sahrens bzero(db->db.db_data, db->db.db_size); 1932c717a561Smaybee db->db_freed_in_flight = FALSE; 1933fa9e4066Sahrens } 1934fa9e4066Sahrens db->db_state = DB_CACHED; 1935fa9e4066Sahrens cv_broadcast(&db->db_changed); 1936fa9e4066Sahrens } 1937fa9e4066Sahrens mutex_exit(&db->db_mtx); 1938fa9e4066Sahrens } 1939fa9e4066Sahrens 19405d7b4d43SMatthew Ahrens void 19415d7b4d43SMatthew Ahrens dmu_buf_write_embedded(dmu_buf_t *dbuf, void *data, 19425d7b4d43SMatthew Ahrens bp_embedded_type_t etype, enum zio_compress comp, 19435d7b4d43SMatthew Ahrens int uncompressed_size, int compressed_size, int byteorder, 19445d7b4d43SMatthew Ahrens dmu_tx_t *tx) 19455d7b4d43SMatthew Ahrens { 19465d7b4d43SMatthew Ahrens dmu_buf_impl_t *db = (dmu_buf_impl_t *)dbuf; 19475d7b4d43SMatthew Ahrens struct dirty_leaf *dl; 19485d7b4d43SMatthew Ahrens dmu_object_type_t type; 19495d7b4d43SMatthew Ahrens 1950ca0cc391SMatthew Ahrens if (etype == BP_EMBEDDED_TYPE_DATA) { 1951ca0cc391SMatthew Ahrens ASSERT(spa_feature_is_active(dmu_objset_spa(db->db_objset), 1952ca0cc391SMatthew Ahrens SPA_FEATURE_EMBEDDED_DATA)); 1953ca0cc391SMatthew Ahrens } 1954ca0cc391SMatthew Ahrens 19555d7b4d43SMatthew Ahrens DB_DNODE_ENTER(db); 19565d7b4d43SMatthew Ahrens type = DB_DNODE(db)->dn_type; 19575d7b4d43SMatthew Ahrens DB_DNODE_EXIT(db); 19585d7b4d43SMatthew Ahrens 19595d7b4d43SMatthew Ahrens ASSERT0(db->db_level); 19605d7b4d43SMatthew Ahrens ASSERT(db->db_blkid != DMU_BONUS_BLKID); 19615d7b4d43SMatthew Ahrens 19625d7b4d43SMatthew Ahrens dmu_buf_will_not_fill(dbuf, tx); 19635d7b4d43SMatthew Ahrens 19645d7b4d43SMatthew Ahrens ASSERT3U(db->db_last_dirty->dr_txg, ==, tx->tx_txg); 19655d7b4d43SMatthew Ahrens dl = &db->db_last_dirty->dt.dl; 19665d7b4d43SMatthew Ahrens encode_embedded_bp_compressed(&dl->dr_overridden_by, 19675d7b4d43SMatthew Ahrens data, comp, uncompressed_size, compressed_size); 19685d7b4d43SMatthew Ahrens BPE_SET_ETYPE(&dl->dr_overridden_by, etype); 19695d7b4d43SMatthew Ahrens BP_SET_TYPE(&dl->dr_overridden_by, type); 19705d7b4d43SMatthew Ahrens BP_SET_LEVEL(&dl->dr_overridden_by, 0); 19715d7b4d43SMatthew Ahrens BP_SET_BYTEORDER(&dl->dr_overridden_by, byteorder); 19725d7b4d43SMatthew Ahrens 19735d7b4d43SMatthew Ahrens dl->dr_override_state = DR_OVERRIDDEN; 19745d7b4d43SMatthew Ahrens dl->dr_overridden_by.blk_birth = db->db_last_dirty->dr_txg; 19755d7b4d43SMatthew Ahrens } 19765d7b4d43SMatthew Ahrens 19772fdbea25SAleksandr Guzovskiy /* 19782fdbea25SAleksandr Guzovskiy * Directly assign a provided arc buf to a given dbuf if it's not referenced 19792fdbea25SAleksandr Guzovskiy * by anybody except our caller. Otherwise copy arcbuf's contents to dbuf. 19802fdbea25SAleksandr Guzovskiy */ 19812fdbea25SAleksandr Guzovskiy void 19822fdbea25SAleksandr Guzovskiy dbuf_assign_arcbuf(dmu_buf_impl_t *db, arc_buf_t *buf, dmu_tx_t *tx) 19832fdbea25SAleksandr Guzovskiy { 19842fdbea25SAleksandr Guzovskiy ASSERT(!refcount_is_zero(&db->db_holds)); 19850a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 19862fdbea25SAleksandr Guzovskiy ASSERT(db->db_level == 0); 19872fdbea25SAleksandr Guzovskiy ASSERT(DBUF_GET_BUFC_TYPE(db) == ARC_BUFC_DATA); 19882fdbea25SAleksandr Guzovskiy ASSERT(buf != NULL); 19892fdbea25SAleksandr Guzovskiy ASSERT(arc_buf_size(buf) == db->db.db_size); 19902fdbea25SAleksandr Guzovskiy ASSERT(tx->tx_txg != 0); 19912fdbea25SAleksandr Guzovskiy 19922fdbea25SAleksandr Guzovskiy arc_return_buf(buf, db); 19932fdbea25SAleksandr Guzovskiy ASSERT(arc_released(buf)); 19942fdbea25SAleksandr Guzovskiy 19952fdbea25SAleksandr Guzovskiy mutex_enter(&db->db_mtx); 19962fdbea25SAleksandr Guzovskiy 19972fdbea25SAleksandr Guzovskiy while (db->db_state == DB_READ || db->db_state == DB_FILL) 19982fdbea25SAleksandr Guzovskiy cv_wait(&db->db_changed, &db->db_mtx); 19992fdbea25SAleksandr Guzovskiy 20002fdbea25SAleksandr Guzovskiy ASSERT(db->db_state == DB_CACHED || db->db_state == DB_UNCACHED); 20012fdbea25SAleksandr Guzovskiy 20022fdbea25SAleksandr Guzovskiy if (db->db_state == DB_CACHED && 20032fdbea25SAleksandr Guzovskiy refcount_count(&db->db_holds) - 1 > db->db_dirtycnt) { 20042fdbea25SAleksandr Guzovskiy mutex_exit(&db->db_mtx); 20052fdbea25SAleksandr Guzovskiy (void) dbuf_dirty(db, tx); 20062fdbea25SAleksandr Guzovskiy bcopy(buf->b_data, db->db.db_data, db->db.db_size); 2007dcbf3bd6SGeorge Wilson arc_buf_destroy(buf, db); 2008c242f9a0Schunli zhang - Sun Microsystems - Irvine United States xuio_stat_wbuf_copied(); 20092fdbea25SAleksandr Guzovskiy return; 20102fdbea25SAleksandr Guzovskiy } 20112fdbea25SAleksandr Guzovskiy 2012c242f9a0Schunli zhang - Sun Microsystems - Irvine United States xuio_stat_wbuf_nocopy(); 20132fdbea25SAleksandr Guzovskiy if (db->db_state == DB_CACHED) { 20142fdbea25SAleksandr Guzovskiy dbuf_dirty_record_t *dr = db->db_last_dirty; 20152fdbea25SAleksandr Guzovskiy 20162fdbea25SAleksandr Guzovskiy ASSERT(db->db_buf != NULL); 20172fdbea25SAleksandr Guzovskiy if (dr != NULL && dr->dr_txg == tx->tx_txg) { 20182fdbea25SAleksandr Guzovskiy ASSERT(dr->dt.dl.dr_data == db->db_buf); 20192fdbea25SAleksandr Guzovskiy if (!arc_released(db->db_buf)) { 20202fdbea25SAleksandr Guzovskiy ASSERT(dr->dt.dl.dr_override_state == 20212fdbea25SAleksandr Guzovskiy DR_OVERRIDDEN); 20222fdbea25SAleksandr Guzovskiy arc_release(db->db_buf, db); 20232fdbea25SAleksandr Guzovskiy } 20242fdbea25SAleksandr Guzovskiy dr->dt.dl.dr_data = buf; 2025dcbf3bd6SGeorge Wilson arc_buf_destroy(db->db_buf, db); 20262fdbea25SAleksandr Guzovskiy } else if (dr == NULL || dr->dt.dl.dr_data != db->db_buf) { 20272fdbea25SAleksandr Guzovskiy arc_release(db->db_buf, db); 2028dcbf3bd6SGeorge Wilson arc_buf_destroy(db->db_buf, db); 20292fdbea25SAleksandr Guzovskiy } 20302fdbea25SAleksandr Guzovskiy db->db_buf = NULL; 20312fdbea25SAleksandr Guzovskiy } 20322fdbea25SAleksandr Guzovskiy ASSERT(db->db_buf == NULL); 20332fdbea25SAleksandr Guzovskiy dbuf_set_data(db, buf); 20342fdbea25SAleksandr Guzovskiy db->db_state = DB_FILL; 20352fdbea25SAleksandr Guzovskiy mutex_exit(&db->db_mtx); 20362fdbea25SAleksandr Guzovskiy (void) dbuf_dirty(db, tx); 203743466aaeSMax Grossman dmu_buf_fill_done(&db->db, tx); 20382fdbea25SAleksandr Guzovskiy } 20392fdbea25SAleksandr Guzovskiy 2040ea8dc4b6Seschrock void 2041dcbf3bd6SGeorge Wilson dbuf_destroy(dmu_buf_impl_t *db) 2042fa9e4066Sahrens { 2043744947dcSTom Erickson dnode_t *dn; 2044ea8dc4b6Seschrock dmu_buf_impl_t *parent = db->db_parent; 2045744947dcSTom Erickson dmu_buf_impl_t *dndb; 2046fa9e4066Sahrens 2047fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 2048fa9e4066Sahrens ASSERT(refcount_is_zero(&db->db_holds)); 2049fa9e4066Sahrens 2050dcbf3bd6SGeorge Wilson if (db->db_buf != NULL) { 2051dcbf3bd6SGeorge Wilson arc_buf_destroy(db->db_buf, db); 2052dcbf3bd6SGeorge Wilson db->db_buf = NULL; 2053dcbf3bd6SGeorge Wilson } 2054ea8dc4b6Seschrock 2055dcbf3bd6SGeorge Wilson if (db->db_blkid == DMU_BONUS_BLKID) { 2056ea8dc4b6Seschrock ASSERT(db->db.db_data != NULL); 2057dcbf3bd6SGeorge Wilson zio_buf_free(db->db.db_data, DN_MAX_BONUSLEN); 2058dcbf3bd6SGeorge Wilson arc_space_return(DN_MAX_BONUSLEN, ARC_SPACE_OTHER); 2059fa9e4066Sahrens db->db_state = DB_UNCACHED; 2060fa9e4066Sahrens } 2061fa9e4066Sahrens 2062dcbf3bd6SGeorge Wilson dbuf_clear_data(db); 2063dcbf3bd6SGeorge Wilson 2064dcbf3bd6SGeorge Wilson if (multilist_link_active(&db->db_cache_link)) { 2065dcbf3bd6SGeorge Wilson multilist_remove(&dbuf_cache, db); 2066dcbf3bd6SGeorge Wilson (void) refcount_remove_many(&dbuf_cache_size, 2067dcbf3bd6SGeorge Wilson db->db.db_size, db); 2068dcbf3bd6SGeorge Wilson } 2069dcbf3bd6SGeorge Wilson 207082c9918fSTim Haley ASSERT(db->db_state == DB_UNCACHED || db->db_state == DB_NOFILL); 2071fa9e4066Sahrens ASSERT(db->db_data_pending == NULL); 2072fa9e4066Sahrens 2073ea8dc4b6Seschrock db->db_state = DB_EVICTING; 2074ea8dc4b6Seschrock db->db_blkptr = NULL; 2075ea8dc4b6Seschrock 2076dcbf3bd6SGeorge Wilson /* 2077dcbf3bd6SGeorge Wilson * Now that db_state is DB_EVICTING, nobody else can find this via 2078dcbf3bd6SGeorge Wilson * the hash table. We can now drop db_mtx, which allows us to 2079dcbf3bd6SGeorge Wilson * acquire the dn_dbufs_mtx. 2080dcbf3bd6SGeorge Wilson */ 2081dcbf3bd6SGeorge Wilson mutex_exit(&db->db_mtx); 2082dcbf3bd6SGeorge Wilson 2083744947dcSTom Erickson DB_DNODE_ENTER(db); 2084744947dcSTom Erickson dn = DB_DNODE(db); 2085744947dcSTom Erickson dndb = dn->dn_dbuf; 2086dcbf3bd6SGeorge Wilson if (db->db_blkid != DMU_BONUS_BLKID) { 2087dcbf3bd6SGeorge Wilson boolean_t needlock = !MUTEX_HELD(&dn->dn_dbufs_mtx); 2088dcbf3bd6SGeorge Wilson if (needlock) 2089dcbf3bd6SGeorge Wilson mutex_enter(&dn->dn_dbufs_mtx); 20900f6d88adSAlex Reece avl_remove(&dn->dn_dbufs, db); 2091640c1670SJosef 'Jeff' Sipek atomic_dec_32(&dn->dn_dbufs_count); 2092744947dcSTom Erickson membar_producer(); 2093744947dcSTom Erickson DB_DNODE_EXIT(db); 2094dcbf3bd6SGeorge Wilson if (needlock) 2095dcbf3bd6SGeorge Wilson mutex_exit(&dn->dn_dbufs_mtx); 2096744947dcSTom Erickson /* 2097744947dcSTom Erickson * Decrementing the dbuf count means that the hold corresponding 2098744947dcSTom Erickson * to the removed dbuf is no longer discounted in dnode_move(), 2099744947dcSTom Erickson * so the dnode cannot be moved until after we release the hold. 2100744947dcSTom Erickson * The membar_producer() ensures visibility of the decremented 2101744947dcSTom Erickson * value in dnode_move(), since DB_DNODE_EXIT doesn't actually 2102744947dcSTom Erickson * release any lock. 2103744947dcSTom Erickson */ 2104ea8dc4b6Seschrock dnode_rele(dn, db); 2105744947dcSTom Erickson db->db_dnode_handle = NULL; 2106dcbf3bd6SGeorge Wilson 2107dcbf3bd6SGeorge Wilson dbuf_hash_remove(db); 2108744947dcSTom Erickson } else { 2109744947dcSTom Erickson DB_DNODE_EXIT(db); 2110ea8dc4b6Seschrock } 2111ea8dc4b6Seschrock 2112dcbf3bd6SGeorge Wilson ASSERT(refcount_is_zero(&db->db_holds)); 2113ea8dc4b6Seschrock 2114dcbf3bd6SGeorge Wilson db->db_parent = NULL; 2115dcbf3bd6SGeorge Wilson 2116dcbf3bd6SGeorge Wilson ASSERT(db->db_buf == NULL); 2117dcbf3bd6SGeorge Wilson ASSERT(db->db.db_data == NULL); 2118dcbf3bd6SGeorge Wilson ASSERT(db->db_hash_next == NULL); 2119dcbf3bd6SGeorge Wilson ASSERT(db->db_blkptr == NULL); 2120dcbf3bd6SGeorge Wilson ASSERT(db->db_data_pending == NULL); 2121dcbf3bd6SGeorge Wilson ASSERT(!multilist_link_active(&db->db_cache_link)); 2122dcbf3bd6SGeorge Wilson 2123dcbf3bd6SGeorge Wilson kmem_cache_free(dbuf_kmem_cache, db); 2124dcbf3bd6SGeorge Wilson arc_space_return(sizeof (dmu_buf_impl_t), ARC_SPACE_OTHER); 2125fa9e4066Sahrens 2126fa9e4066Sahrens /* 2127744947dcSTom Erickson * If this dbuf is referenced from an indirect dbuf, 2128fa9e4066Sahrens * decrement the ref count on the indirect dbuf. 2129fa9e4066Sahrens */ 2130c543ec06Sahrens if (parent && parent != dndb) 2131ea8dc4b6Seschrock dbuf_rele(parent, db); 2132fa9e4066Sahrens } 2133fa9e4066Sahrens 2134a2cdcdd2SPaul Dagnelie /* 2135a2cdcdd2SPaul Dagnelie * Note: While bpp will always be updated if the function returns success, 2136a2cdcdd2SPaul Dagnelie * parentp will not be updated if the dnode does not have dn_dbuf filled in; 2137a2cdcdd2SPaul Dagnelie * this happens when the dnode is the meta-dnode, or a userused or groupused 2138a2cdcdd2SPaul Dagnelie * object. 2139a2cdcdd2SPaul Dagnelie */ 2140fa9e4066Sahrens static int 2141fa9e4066Sahrens dbuf_findbp(dnode_t *dn, int level, uint64_t blkid, int fail_sparse, 2142fa9e4066Sahrens dmu_buf_impl_t **parentp, blkptr_t **bpp) 2143fa9e4066Sahrens { 2144fa9e4066Sahrens int nlevels, epbs; 2145fa9e4066Sahrens 21460b69c2f0Sahrens *parentp = NULL; 21470b69c2f0Sahrens *bpp = NULL; 21480b69c2f0Sahrens 21490a586ceaSMark Shellenbaum ASSERT(blkid != DMU_BONUS_BLKID); 21500a586ceaSMark Shellenbaum 21510a586ceaSMark Shellenbaum if (blkid == DMU_SPILL_BLKID) { 21520a586ceaSMark Shellenbaum mutex_enter(&dn->dn_mtx); 215306e0070dSMark Shellenbaum if (dn->dn_have_spill && 215406e0070dSMark Shellenbaum (dn->dn_phys->dn_flags & DNODE_FLAG_SPILL_BLKPTR)) 21550a586ceaSMark Shellenbaum *bpp = &dn->dn_phys->dn_spill; 21560a586ceaSMark Shellenbaum else 21570a586ceaSMark Shellenbaum *bpp = NULL; 21580a586ceaSMark Shellenbaum dbuf_add_ref(dn->dn_dbuf, NULL); 21590a586ceaSMark Shellenbaum *parentp = dn->dn_dbuf; 21600a586ceaSMark Shellenbaum mutex_exit(&dn->dn_mtx); 21610a586ceaSMark Shellenbaum return (0); 21620a586ceaSMark Shellenbaum } 2163ea8dc4b6Seschrock 2164fa9e4066Sahrens if (dn->dn_phys->dn_nlevels == 0) 2165fa9e4066Sahrens nlevels = 1; 2166fa9e4066Sahrens else 2167fa9e4066Sahrens nlevels = dn->dn_phys->dn_nlevels; 2168fa9e4066Sahrens 2169fa9e4066Sahrens epbs = dn->dn_indblkshift - SPA_BLKPTRSHIFT; 2170fa9e4066Sahrens 2171fa9e4066Sahrens ASSERT3U(level * epbs, <, 64); 2172fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 2173ea8dc4b6Seschrock if (level >= nlevels || 2174fa9e4066Sahrens (blkid > (dn->dn_phys->dn_maxblkid >> (level * epbs)))) { 2175fa9e4066Sahrens /* the buffer has no parent yet */ 2176be6fd75aSMatthew Ahrens return (SET_ERROR(ENOENT)); 2177fa9e4066Sahrens } else if (level < nlevels-1) { 2178fa9e4066Sahrens /* this block is referenced from an indirect block */ 2179fa9e4066Sahrens int err = dbuf_hold_impl(dn, level+1, 2180a2cdcdd2SPaul Dagnelie blkid >> epbs, fail_sparse, FALSE, NULL, parentp); 2181fa9e4066Sahrens if (err) 2182fa9e4066Sahrens return (err); 2183ea8dc4b6Seschrock err = dbuf_read(*parentp, NULL, 2184ea8dc4b6Seschrock (DB_RF_HAVESTRUCT | DB_RF_NOPREFETCH | DB_RF_CANFAIL)); 2185c543ec06Sahrens if (err) { 2186c543ec06Sahrens dbuf_rele(*parentp, NULL); 2187c543ec06Sahrens *parentp = NULL; 2188c543ec06Sahrens return (err); 2189ea8dc4b6Seschrock } 2190c543ec06Sahrens *bpp = ((blkptr_t *)(*parentp)->db.db_data) + 2191c543ec06Sahrens (blkid & ((1ULL << epbs) - 1)); 2192c543ec06Sahrens return (0); 2193fa9e4066Sahrens } else { 2194fa9e4066Sahrens /* the block is referenced from the dnode */ 2195fa9e4066Sahrens ASSERT3U(level, ==, nlevels-1); 2196fa9e4066Sahrens ASSERT(dn->dn_phys->dn_nblkptr == 0 || 2197fa9e4066Sahrens blkid < dn->dn_phys->dn_nblkptr); 2198c543ec06Sahrens if (dn->dn_dbuf) { 2199c543ec06Sahrens dbuf_add_ref(dn->dn_dbuf, NULL); 2200c543ec06Sahrens *parentp = dn->dn_dbuf; 2201c543ec06Sahrens } 2202fa9e4066Sahrens *bpp = &dn->dn_phys->dn_blkptr[blkid]; 2203fa9e4066Sahrens return (0); 2204fa9e4066Sahrens } 2205fa9e4066Sahrens } 2206fa9e4066Sahrens 2207fa9e4066Sahrens static dmu_buf_impl_t * 2208fa9e4066Sahrens dbuf_create(dnode_t *dn, uint8_t level, uint64_t blkid, 2209fa9e4066Sahrens dmu_buf_impl_t *parent, blkptr_t *blkptr) 2210fa9e4066Sahrens { 2211503ad85cSMatthew Ahrens objset_t *os = dn->dn_objset; 2212fa9e4066Sahrens dmu_buf_impl_t *db, *odb; 2213fa9e4066Sahrens 2214fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 2215fa9e4066Sahrens ASSERT(dn->dn_type != DMU_OT_NONE); 2216fa9e4066Sahrens 2217dcbf3bd6SGeorge Wilson db = kmem_cache_alloc(dbuf_kmem_cache, KM_SLEEP); 2218fa9e4066Sahrens 2219fa9e4066Sahrens db->db_objset = os; 2220fa9e4066Sahrens db->db.db_object = dn->dn_object; 2221fa9e4066Sahrens db->db_level = level; 2222fa9e4066Sahrens db->db_blkid = blkid; 2223c717a561Smaybee db->db_last_dirty = NULL; 2224ea8dc4b6Seschrock db->db_dirtycnt = 0; 2225744947dcSTom Erickson db->db_dnode_handle = dn->dn_handle; 2226ea8dc4b6Seschrock db->db_parent = parent; 2227ea8dc4b6Seschrock db->db_blkptr = blkptr; 2228fa9e4066Sahrens 2229bc9014e6SJustin Gibbs db->db_user = NULL; 2230d2058105SJustin T. Gibbs db->db_user_immediate_evict = FALSE; 2231d2058105SJustin T. Gibbs db->db_freed_in_flight = FALSE; 2232d2058105SJustin T. Gibbs db->db_pending_evict = FALSE; 2233ea8dc4b6Seschrock 22340a586ceaSMark Shellenbaum if (blkid == DMU_BONUS_BLKID) { 2235ea8dc4b6Seschrock ASSERT3P(parent, ==, dn->dn_dbuf); 22361934e92fSmaybee db->db.db_size = DN_MAX_BONUSLEN - 22371934e92fSmaybee (dn->dn_nblkptr-1) * sizeof (blkptr_t); 22381934e92fSmaybee ASSERT3U(db->db.db_size, >=, dn->dn_bonuslen); 22390a586ceaSMark Shellenbaum db->db.db_offset = DMU_BONUS_BLKID; 2240ea8dc4b6Seschrock db->db_state = DB_UNCACHED; 2241ea8dc4b6Seschrock /* the bonus dbuf is not placed in the hash table */ 22425a98e54bSBrendan Gregg - Sun Microsystems arc_space_consume(sizeof (dmu_buf_impl_t), ARC_SPACE_OTHER); 2243ea8dc4b6Seschrock return (db); 22440a586ceaSMark Shellenbaum } else if (blkid == DMU_SPILL_BLKID) { 22450a586ceaSMark Shellenbaum db->db.db_size = (blkptr != NULL) ? 22460a586ceaSMark Shellenbaum BP_GET_LSIZE(blkptr) : SPA_MINBLOCKSIZE; 22470a586ceaSMark Shellenbaum db->db.db_offset = 0; 2248fa9e4066Sahrens } else { 2249fa9e4066Sahrens int blocksize = 225069962b56SMatthew Ahrens db->db_level ? 1 << dn->dn_indblkshift : dn->dn_datablksz; 2251fa9e4066Sahrens db->db.db_size = blocksize; 2252fa9e4066Sahrens db->db.db_offset = db->db_blkid * blocksize; 2253fa9e4066Sahrens } 2254fa9e4066Sahrens 2255fa9e4066Sahrens /* 2256fa9e4066Sahrens * Hold the dn_dbufs_mtx while we get the new dbuf 2257fa9e4066Sahrens * in the hash table *and* added to the dbufs list. 2258fa9e4066Sahrens * This prevents a possible deadlock with someone 2259fa9e4066Sahrens * trying to look up this dbuf before its added to the 2260fa9e4066Sahrens * dn_dbufs list. 2261fa9e4066Sahrens */ 2262fa9e4066Sahrens mutex_enter(&dn->dn_dbufs_mtx); 2263ea8dc4b6Seschrock db->db_state = DB_EVICTING; 2264fa9e4066Sahrens if ((odb = dbuf_hash_insert(db)) != NULL) { 2265fa9e4066Sahrens /* someone else inserted it first */ 2266dcbf3bd6SGeorge Wilson kmem_cache_free(dbuf_kmem_cache, db); 2267fa9e4066Sahrens mutex_exit(&dn->dn_dbufs_mtx); 2268fa9e4066Sahrens return (odb); 2269fa9e4066Sahrens } 22700f6d88adSAlex Reece avl_add(&dn->dn_dbufs, db); 2271653af1b8SStephen Blinick 2272ea8dc4b6Seschrock db->db_state = DB_UNCACHED; 2273fa9e4066Sahrens mutex_exit(&dn->dn_dbufs_mtx); 22745a98e54bSBrendan Gregg - Sun Microsystems arc_space_consume(sizeof (dmu_buf_impl_t), ARC_SPACE_OTHER); 2275fa9e4066Sahrens 2276fa9e4066Sahrens if (parent && parent != dn->dn_dbuf) 2277fa9e4066Sahrens dbuf_add_ref(parent, db); 2278fa9e4066Sahrens 2279ea8dc4b6Seschrock ASSERT(dn->dn_object == DMU_META_DNODE_OBJECT || 2280ea8dc4b6Seschrock refcount_count(&dn->dn_holds) > 0); 2281fa9e4066Sahrens (void) refcount_add(&dn->dn_holds, db); 2282640c1670SJosef 'Jeff' Sipek atomic_inc_32(&dn->dn_dbufs_count); 2283fa9e4066Sahrens 2284fa9e4066Sahrens dprintf_dbuf(db, "db=%p\n", db); 2285fa9e4066Sahrens 2286fa9e4066Sahrens return (db); 2287fa9e4066Sahrens } 2288fa9e4066Sahrens 2289a2cdcdd2SPaul Dagnelie typedef struct dbuf_prefetch_arg { 2290a2cdcdd2SPaul Dagnelie spa_t *dpa_spa; /* The spa to issue the prefetch in. */ 2291a2cdcdd2SPaul Dagnelie zbookmark_phys_t dpa_zb; /* The target block to prefetch. */ 2292a2cdcdd2SPaul Dagnelie int dpa_epbs; /* Entries (blkptr_t's) Per Block Shift. */ 2293a2cdcdd2SPaul Dagnelie int dpa_curlevel; /* The current level that we're reading */ 2294dcbf3bd6SGeorge Wilson dnode_t *dpa_dnode; /* The dnode associated with the prefetch */ 2295a2cdcdd2SPaul Dagnelie zio_priority_t dpa_prio; /* The priority I/Os should be issued at. */ 2296a2cdcdd2SPaul Dagnelie zio_t *dpa_zio; /* The parent zio_t for all prefetches. */ 2297a2cdcdd2SPaul Dagnelie arc_flags_t dpa_aflags; /* Flags to pass to the final prefetch. */ 2298a2cdcdd2SPaul Dagnelie } dbuf_prefetch_arg_t; 2299a2cdcdd2SPaul Dagnelie 2300a2cdcdd2SPaul Dagnelie /* 2301a2cdcdd2SPaul Dagnelie * Actually issue the prefetch read for the block given. 2302a2cdcdd2SPaul Dagnelie */ 2303a2cdcdd2SPaul Dagnelie static void 2304a2cdcdd2SPaul Dagnelie dbuf_issue_final_prefetch(dbuf_prefetch_arg_t *dpa, blkptr_t *bp) 2305a2cdcdd2SPaul Dagnelie { 2306a2cdcdd2SPaul Dagnelie if (BP_IS_HOLE(bp) || BP_IS_EMBEDDED(bp)) 2307a2cdcdd2SPaul Dagnelie return; 2308a2cdcdd2SPaul Dagnelie 2309a2cdcdd2SPaul Dagnelie arc_flags_t aflags = 2310a2cdcdd2SPaul Dagnelie dpa->dpa_aflags | ARC_FLAG_NOWAIT | ARC_FLAG_PREFETCH; 2311a2cdcdd2SPaul Dagnelie 2312a2cdcdd2SPaul Dagnelie ASSERT3U(dpa->dpa_curlevel, ==, BP_GET_LEVEL(bp)); 2313a2cdcdd2SPaul Dagnelie ASSERT3U(dpa->dpa_curlevel, ==, dpa->dpa_zb.zb_level); 2314a2cdcdd2SPaul Dagnelie ASSERT(dpa->dpa_zio != NULL); 2315a2cdcdd2SPaul Dagnelie (void) arc_read(dpa->dpa_zio, dpa->dpa_spa, bp, NULL, NULL, 2316a2cdcdd2SPaul Dagnelie dpa->dpa_prio, ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE, 2317a2cdcdd2SPaul Dagnelie &aflags, &dpa->dpa_zb); 2318a2cdcdd2SPaul Dagnelie } 2319a2cdcdd2SPaul Dagnelie 2320a2cdcdd2SPaul Dagnelie /* 2321a2cdcdd2SPaul Dagnelie * Called when an indirect block above our prefetch target is read in. This 2322a2cdcdd2SPaul Dagnelie * will either read in the next indirect block down the tree or issue the actual 2323a2cdcdd2SPaul Dagnelie * prefetch if the next block down is our target. 2324a2cdcdd2SPaul Dagnelie */ 2325a2cdcdd2SPaul Dagnelie static void 2326a2cdcdd2SPaul Dagnelie dbuf_prefetch_indirect_done(zio_t *zio, arc_buf_t *abuf, void *private) 2327a2cdcdd2SPaul Dagnelie { 2328a2cdcdd2SPaul Dagnelie dbuf_prefetch_arg_t *dpa = private; 2329a2cdcdd2SPaul Dagnelie 2330a2cdcdd2SPaul Dagnelie ASSERT3S(dpa->dpa_zb.zb_level, <, dpa->dpa_curlevel); 2331a2cdcdd2SPaul Dagnelie ASSERT3S(dpa->dpa_curlevel, >, 0); 2332dcbf3bd6SGeorge Wilson 2333dcbf3bd6SGeorge Wilson /* 2334dcbf3bd6SGeorge Wilson * The dpa_dnode is only valid if we are called with a NULL 2335dcbf3bd6SGeorge Wilson * zio. This indicates that the arc_read() returned without 2336dcbf3bd6SGeorge Wilson * first calling zio_read() to issue a physical read. Once 2337dcbf3bd6SGeorge Wilson * a physical read is made the dpa_dnode must be invalidated 2338dcbf3bd6SGeorge Wilson * as the locks guarding it may have been dropped. If the 2339dcbf3bd6SGeorge Wilson * dpa_dnode is still valid, then we want to add it to the dbuf 2340dcbf3bd6SGeorge Wilson * cache. To do so, we must hold the dbuf associated with the block 2341dcbf3bd6SGeorge Wilson * we just prefetched, read its contents so that we associate it 2342dcbf3bd6SGeorge Wilson * with an arc_buf_t, and then release it. 2343dcbf3bd6SGeorge Wilson */ 2344a2cdcdd2SPaul Dagnelie if (zio != NULL) { 2345a2cdcdd2SPaul Dagnelie ASSERT3S(BP_GET_LEVEL(zio->io_bp), ==, dpa->dpa_curlevel); 2346dcbf3bd6SGeorge Wilson if (zio->io_flags & ZIO_FLAG_RAW) { 2347dcbf3bd6SGeorge Wilson ASSERT3U(BP_GET_PSIZE(zio->io_bp), ==, zio->io_size); 2348dcbf3bd6SGeorge Wilson } else { 2349dcbf3bd6SGeorge Wilson ASSERT3U(BP_GET_LSIZE(zio->io_bp), ==, zio->io_size); 2350dcbf3bd6SGeorge Wilson } 2351a2cdcdd2SPaul Dagnelie ASSERT3P(zio->io_spa, ==, dpa->dpa_spa); 2352dcbf3bd6SGeorge Wilson 2353dcbf3bd6SGeorge Wilson dpa->dpa_dnode = NULL; 2354dcbf3bd6SGeorge Wilson } else if (dpa->dpa_dnode != NULL) { 2355dcbf3bd6SGeorge Wilson uint64_t curblkid = dpa->dpa_zb.zb_blkid >> 2356dcbf3bd6SGeorge Wilson (dpa->dpa_epbs * (dpa->dpa_curlevel - 2357dcbf3bd6SGeorge Wilson dpa->dpa_zb.zb_level)); 2358dcbf3bd6SGeorge Wilson dmu_buf_impl_t *db = dbuf_hold_level(dpa->dpa_dnode, 2359dcbf3bd6SGeorge Wilson dpa->dpa_curlevel, curblkid, FTAG); 2360dcbf3bd6SGeorge Wilson (void) dbuf_read(db, NULL, 2361dcbf3bd6SGeorge Wilson DB_RF_MUST_SUCCEED | DB_RF_NOPREFETCH | DB_RF_HAVESTRUCT); 2362dcbf3bd6SGeorge Wilson dbuf_rele(db, FTAG); 2363a2cdcdd2SPaul Dagnelie } 2364a2cdcdd2SPaul Dagnelie 2365a2cdcdd2SPaul Dagnelie dpa->dpa_curlevel--; 2366a2cdcdd2SPaul Dagnelie 2367a2cdcdd2SPaul Dagnelie uint64_t nextblkid = dpa->dpa_zb.zb_blkid >> 2368a2cdcdd2SPaul Dagnelie (dpa->dpa_epbs * (dpa->dpa_curlevel - dpa->dpa_zb.zb_level)); 2369a2cdcdd2SPaul Dagnelie blkptr_t *bp = ((blkptr_t *)abuf->b_data) + 2370a2cdcdd2SPaul Dagnelie P2PHASE(nextblkid, 1ULL << dpa->dpa_epbs); 2371a2cdcdd2SPaul Dagnelie if (BP_IS_HOLE(bp) || (zio != NULL && zio->io_error != 0)) { 2372a2cdcdd2SPaul Dagnelie kmem_free(dpa, sizeof (*dpa)); 2373a2cdcdd2SPaul Dagnelie } else if (dpa->dpa_curlevel == dpa->dpa_zb.zb_level) { 2374a2cdcdd2SPaul Dagnelie ASSERT3U(nextblkid, ==, dpa->dpa_zb.zb_blkid); 2375a2cdcdd2SPaul Dagnelie dbuf_issue_final_prefetch(dpa, bp); 2376a2cdcdd2SPaul Dagnelie kmem_free(dpa, sizeof (*dpa)); 2377a2cdcdd2SPaul Dagnelie } else { 2378a2cdcdd2SPaul Dagnelie arc_flags_t iter_aflags = ARC_FLAG_NOWAIT; 2379a2cdcdd2SPaul Dagnelie zbookmark_phys_t zb; 2380a2cdcdd2SPaul Dagnelie 2381a2cdcdd2SPaul Dagnelie ASSERT3U(dpa->dpa_curlevel, ==, BP_GET_LEVEL(bp)); 2382a2cdcdd2SPaul Dagnelie 2383a2cdcdd2SPaul Dagnelie SET_BOOKMARK(&zb, dpa->dpa_zb.zb_objset, 2384a2cdcdd2SPaul Dagnelie dpa->dpa_zb.zb_object, dpa->dpa_curlevel, nextblkid); 2385a2cdcdd2SPaul Dagnelie 2386a2cdcdd2SPaul Dagnelie (void) arc_read(dpa->dpa_zio, dpa->dpa_spa, 2387a2cdcdd2SPaul Dagnelie bp, dbuf_prefetch_indirect_done, dpa, dpa->dpa_prio, 2388a2cdcdd2SPaul Dagnelie ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE, 2389a2cdcdd2SPaul Dagnelie &iter_aflags, &zb); 2390a2cdcdd2SPaul Dagnelie } 2391dcbf3bd6SGeorge Wilson 2392dcbf3bd6SGeorge Wilson arc_buf_destroy(abuf, private); 2393a2cdcdd2SPaul Dagnelie } 2394a2cdcdd2SPaul Dagnelie 2395a2cdcdd2SPaul Dagnelie /* 2396a2cdcdd2SPaul Dagnelie * Issue prefetch reads for the given block on the given level. If the indirect 2397a2cdcdd2SPaul Dagnelie * blocks above that block are not in memory, we will read them in 2398a2cdcdd2SPaul Dagnelie * asynchronously. As a result, this call never blocks waiting for a read to 2399a2cdcdd2SPaul Dagnelie * complete. 2400a2cdcdd2SPaul Dagnelie */ 2401fa9e4066Sahrens void 2402a2cdcdd2SPaul Dagnelie dbuf_prefetch(dnode_t *dn, int64_t level, uint64_t blkid, zio_priority_t prio, 2403a2cdcdd2SPaul Dagnelie arc_flags_t aflags) 2404fa9e4066Sahrens { 2405a2cdcdd2SPaul Dagnelie blkptr_t bp; 2406a2cdcdd2SPaul Dagnelie int epbs, nlevels, curlevel; 2407a2cdcdd2SPaul Dagnelie uint64_t curblkid; 2408fa9e4066Sahrens 24090a586ceaSMark Shellenbaum ASSERT(blkid != DMU_BONUS_BLKID); 2410fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 2411fa9e4066Sahrens 2412cf6106c8SMatthew Ahrens if (blkid > dn->dn_maxblkid) 2413cf6106c8SMatthew Ahrens return; 2414cf6106c8SMatthew Ahrens 2415fa9e4066Sahrens if (dnode_block_freed(dn, blkid)) 2416fa9e4066Sahrens return; 2417fa9e4066Sahrens 2418a2cdcdd2SPaul Dagnelie /* 2419a2cdcdd2SPaul Dagnelie * This dnode hasn't been written to disk yet, so there's nothing to 2420a2cdcdd2SPaul Dagnelie * prefetch. 2421a2cdcdd2SPaul Dagnelie */ 2422a2cdcdd2SPaul Dagnelie nlevels = dn->dn_phys->dn_nlevels; 2423a2cdcdd2SPaul Dagnelie if (level >= nlevels || dn->dn_phys->dn_nblkptr == 0) 2424a2cdcdd2SPaul Dagnelie return; 2425a2cdcdd2SPaul Dagnelie 2426a2cdcdd2SPaul Dagnelie epbs = dn->dn_phys->dn_indblkshift - SPA_BLKPTRSHIFT; 2427a2cdcdd2SPaul Dagnelie if (dn->dn_phys->dn_maxblkid < blkid << (epbs * level)) 2428a2cdcdd2SPaul Dagnelie return; 2429a2cdcdd2SPaul Dagnelie 2430a2cdcdd2SPaul Dagnelie dmu_buf_impl_t *db = dbuf_find(dn->dn_objset, dn->dn_object, 2431a2cdcdd2SPaul Dagnelie level, blkid); 2432a2cdcdd2SPaul Dagnelie if (db != NULL) { 2433a2cdcdd2SPaul Dagnelie mutex_exit(&db->db_mtx); 24349e9c486fSGeorge Wilson /* 2435a2cdcdd2SPaul Dagnelie * This dbuf already exists. It is either CACHED, or 2436a2cdcdd2SPaul Dagnelie * (we assume) about to be read or filled. 24379e9c486fSGeorge Wilson */ 24389e9c486fSGeorge Wilson return; 2439fa9e4066Sahrens } 2440fa9e4066Sahrens 2441a2cdcdd2SPaul Dagnelie /* 2442a2cdcdd2SPaul Dagnelie * Find the closest ancestor (indirect block) of the target block 2443a2cdcdd2SPaul Dagnelie * that is present in the cache. In this indirect block, we will 2444a2cdcdd2SPaul Dagnelie * find the bp that is at curlevel, curblkid. 2445a2cdcdd2SPaul Dagnelie */ 2446a2cdcdd2SPaul Dagnelie curlevel = level; 2447a2cdcdd2SPaul Dagnelie curblkid = blkid; 2448a2cdcdd2SPaul Dagnelie while (curlevel < nlevels - 1) { 2449a2cdcdd2SPaul Dagnelie int parent_level = curlevel + 1; 2450a2cdcdd2SPaul Dagnelie uint64_t parent_blkid = curblkid >> epbs; 2451a2cdcdd2SPaul Dagnelie dmu_buf_impl_t *db; 2452a2cdcdd2SPaul Dagnelie 2453a2cdcdd2SPaul Dagnelie if (dbuf_hold_impl(dn, parent_level, parent_blkid, 2454a2cdcdd2SPaul Dagnelie FALSE, TRUE, FTAG, &db) == 0) { 2455a2cdcdd2SPaul Dagnelie blkptr_t *bpp = db->db_buf->b_data; 2456a2cdcdd2SPaul Dagnelie bp = bpp[P2PHASE(curblkid, 1 << epbs)]; 2457a2cdcdd2SPaul Dagnelie dbuf_rele(db, FTAG); 2458a2cdcdd2SPaul Dagnelie break; 2459a2cdcdd2SPaul Dagnelie } 2460b24ab676SJeff Bonwick 2461a2cdcdd2SPaul Dagnelie curlevel = parent_level; 2462a2cdcdd2SPaul Dagnelie curblkid = parent_blkid; 2463a2cdcdd2SPaul Dagnelie } 2464ea8dc4b6Seschrock 2465a2cdcdd2SPaul Dagnelie if (curlevel == nlevels - 1) { 2466a2cdcdd2SPaul Dagnelie /* No cached indirect blocks found. */ 2467a2cdcdd2SPaul Dagnelie ASSERT3U(curblkid, <, dn->dn_phys->dn_nblkptr); 2468a2cdcdd2SPaul Dagnelie bp = dn->dn_phys->dn_blkptr[curblkid]; 2469fa9e4066Sahrens } 2470a2cdcdd2SPaul Dagnelie if (BP_IS_HOLE(&bp)) 2471a2cdcdd2SPaul Dagnelie return; 2472a2cdcdd2SPaul Dagnelie 2473a2cdcdd2SPaul Dagnelie ASSERT3U(curlevel, ==, BP_GET_LEVEL(&bp)); 2474a2cdcdd2SPaul Dagnelie 2475a2cdcdd2SPaul Dagnelie zio_t *pio = zio_root(dmu_objset_spa(dn->dn_objset), NULL, NULL, 2476a2cdcdd2SPaul Dagnelie ZIO_FLAG_CANFAIL); 2477a2cdcdd2SPaul Dagnelie 2478a2cdcdd2SPaul Dagnelie dbuf_prefetch_arg_t *dpa = kmem_zalloc(sizeof (*dpa), KM_SLEEP); 2479a2cdcdd2SPaul Dagnelie dsl_dataset_t *ds = dn->dn_objset->os_dsl_dataset; 2480a2cdcdd2SPaul Dagnelie SET_BOOKMARK(&dpa->dpa_zb, ds != NULL ? ds->ds_object : DMU_META_OBJSET, 2481a2cdcdd2SPaul Dagnelie dn->dn_object, level, blkid); 2482a2cdcdd2SPaul Dagnelie dpa->dpa_curlevel = curlevel; 2483a2cdcdd2SPaul Dagnelie dpa->dpa_prio = prio; 2484a2cdcdd2SPaul Dagnelie dpa->dpa_aflags = aflags; 2485a2cdcdd2SPaul Dagnelie dpa->dpa_spa = dn->dn_objset->os_spa; 2486dcbf3bd6SGeorge Wilson dpa->dpa_dnode = dn; 2487a2cdcdd2SPaul Dagnelie dpa->dpa_epbs = epbs; 2488a2cdcdd2SPaul Dagnelie dpa->dpa_zio = pio; 2489a2cdcdd2SPaul Dagnelie 2490a2cdcdd2SPaul Dagnelie /* 2491a2cdcdd2SPaul Dagnelie * If we have the indirect just above us, no need to do the asynchronous 2492a2cdcdd2SPaul Dagnelie * prefetch chain; we'll just run the last step ourselves. If we're at 2493a2cdcdd2SPaul Dagnelie * a higher level, though, we want to issue the prefetches for all the 2494a2cdcdd2SPaul Dagnelie * indirect blocks asynchronously, so we can go on with whatever we were 2495a2cdcdd2SPaul Dagnelie * doing. 2496a2cdcdd2SPaul Dagnelie */ 2497a2cdcdd2SPaul Dagnelie if (curlevel == level) { 2498a2cdcdd2SPaul Dagnelie ASSERT3U(curblkid, ==, blkid); 2499a2cdcdd2SPaul Dagnelie dbuf_issue_final_prefetch(dpa, &bp); 2500a2cdcdd2SPaul Dagnelie kmem_free(dpa, sizeof (*dpa)); 2501a2cdcdd2SPaul Dagnelie } else { 2502a2cdcdd2SPaul Dagnelie arc_flags_t iter_aflags = ARC_FLAG_NOWAIT; 2503a2cdcdd2SPaul Dagnelie zbookmark_phys_t zb; 2504a2cdcdd2SPaul Dagnelie 2505a2cdcdd2SPaul Dagnelie SET_BOOKMARK(&zb, ds != NULL ? ds->ds_object : DMU_META_OBJSET, 2506a2cdcdd2SPaul Dagnelie dn->dn_object, curlevel, curblkid); 2507a2cdcdd2SPaul Dagnelie (void) arc_read(dpa->dpa_zio, dpa->dpa_spa, 2508a2cdcdd2SPaul Dagnelie &bp, dbuf_prefetch_indirect_done, dpa, prio, 2509a2cdcdd2SPaul Dagnelie ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE, 2510a2cdcdd2SPaul Dagnelie &iter_aflags, &zb); 2511a2cdcdd2SPaul Dagnelie } 2512a2cdcdd2SPaul Dagnelie /* 2513a2cdcdd2SPaul Dagnelie * We use pio here instead of dpa_zio since it's possible that 2514a2cdcdd2SPaul Dagnelie * dpa may have already been freed. 2515a2cdcdd2SPaul Dagnelie */ 2516a2cdcdd2SPaul Dagnelie zio_nowait(pio); 2517fa9e4066Sahrens } 2518fa9e4066Sahrens 2519fa9e4066Sahrens /* 2520fa9e4066Sahrens * Returns with db_holds incremented, and db_mtx not held. 2521fa9e4066Sahrens * Note: dn_struct_rwlock must be held. 2522fa9e4066Sahrens */ 2523fa9e4066Sahrens int 2524a2cdcdd2SPaul Dagnelie dbuf_hold_impl(dnode_t *dn, uint8_t level, uint64_t blkid, 2525a2cdcdd2SPaul Dagnelie boolean_t fail_sparse, boolean_t fail_uncached, 2526fa9e4066Sahrens void *tag, dmu_buf_impl_t **dbp) 2527fa9e4066Sahrens { 2528fa9e4066Sahrens dmu_buf_impl_t *db, *parent = NULL; 2529fa9e4066Sahrens 25300a586ceaSMark Shellenbaum ASSERT(blkid != DMU_BONUS_BLKID); 2531fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 2532fa9e4066Sahrens ASSERT3U(dn->dn_nlevels, >, level); 2533fa9e4066Sahrens 2534fa9e4066Sahrens *dbp = NULL; 2535ea8dc4b6Seschrock top: 2536fa9e4066Sahrens /* dbuf_find() returns with db_mtx held */ 2537e57a022bSJustin T. Gibbs db = dbuf_find(dn->dn_objset, dn->dn_object, level, blkid); 2538fa9e4066Sahrens 2539fa9e4066Sahrens if (db == NULL) { 2540fa9e4066Sahrens blkptr_t *bp = NULL; 2541fa9e4066Sahrens int err; 2542fa9e4066Sahrens 2543a2cdcdd2SPaul Dagnelie if (fail_uncached) 2544a2cdcdd2SPaul Dagnelie return (SET_ERROR(ENOENT)); 2545a2cdcdd2SPaul Dagnelie 2546c543ec06Sahrens ASSERT3P(parent, ==, NULL); 2547fa9e4066Sahrens err = dbuf_findbp(dn, level, blkid, fail_sparse, &parent, &bp); 2548fa9e4066Sahrens if (fail_sparse) { 2549fa9e4066Sahrens if (err == 0 && bp && BP_IS_HOLE(bp)) 2550be6fd75aSMatthew Ahrens err = SET_ERROR(ENOENT); 2551fa9e4066Sahrens if (err) { 2552c543ec06Sahrens if (parent) 2553ea8dc4b6Seschrock dbuf_rele(parent, NULL); 2554fa9e4066Sahrens return (err); 2555fa9e4066Sahrens } 2556fa9e4066Sahrens } 2557ea8dc4b6Seschrock if (err && err != ENOENT) 2558ea8dc4b6Seschrock return (err); 2559fa9e4066Sahrens db = dbuf_create(dn, level, blkid, parent, bp); 2560fa9e4066Sahrens } 2561fa9e4066Sahrens 2562a2cdcdd2SPaul Dagnelie if (fail_uncached && db->db_state != DB_CACHED) { 2563a2cdcdd2SPaul Dagnelie mutex_exit(&db->db_mtx); 2564a2cdcdd2SPaul Dagnelie return (SET_ERROR(ENOENT)); 2565a2cdcdd2SPaul Dagnelie } 2566a2cdcdd2SPaul Dagnelie 2567dcbf3bd6SGeorge Wilson if (db->db_buf != NULL) 2568ea8dc4b6Seschrock ASSERT3P(db->db.db_data, ==, db->db_buf->b_data); 2569ea8dc4b6Seschrock 2570ea8dc4b6Seschrock ASSERT(db->db_buf == NULL || arc_referenced(db->db_buf)); 2571ea8dc4b6Seschrock 2572fa9e4066Sahrens /* 2573c717a561Smaybee * If this buffer is currently syncing out, and we are are 2574c717a561Smaybee * still referencing it from db_data, we need to make a copy 2575c717a561Smaybee * of it in case we decide we want to dirty it again in this txg. 2576fa9e4066Sahrens */ 25770a586ceaSMark Shellenbaum if (db->db_level == 0 && db->db_blkid != DMU_BONUS_BLKID && 2578ea8dc4b6Seschrock dn->dn_object != DMU_META_DNODE_OBJECT && 2579c717a561Smaybee db->db_state == DB_CACHED && db->db_data_pending) { 2580c717a561Smaybee dbuf_dirty_record_t *dr = db->db_data_pending; 2581fa9e4066Sahrens 2582c717a561Smaybee if (dr->dt.dl.dr_data == db->db_buf) { 2583c717a561Smaybee arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 2584c717a561Smaybee 2585c717a561Smaybee dbuf_set_data(db, 2586dcbf3bd6SGeorge Wilson arc_alloc_buf(dn->dn_objset->os_spa, 2587c717a561Smaybee db->db.db_size, db, type)); 2588c717a561Smaybee bcopy(dr->dt.dl.dr_data->b_data, db->db.db_data, 2589c717a561Smaybee db->db.db_size); 2590c717a561Smaybee } 2591fa9e4066Sahrens } 2592fa9e4066Sahrens 2593dcbf3bd6SGeorge Wilson if (multilist_link_active(&db->db_cache_link)) { 2594dcbf3bd6SGeorge Wilson ASSERT(refcount_is_zero(&db->db_holds)); 2595dcbf3bd6SGeorge Wilson multilist_remove(&dbuf_cache, db); 2596dcbf3bd6SGeorge Wilson (void) refcount_remove_many(&dbuf_cache_size, 2597dcbf3bd6SGeorge Wilson db->db.db_size, db); 2598dcbf3bd6SGeorge Wilson } 2599ea8dc4b6Seschrock (void) refcount_add(&db->db_holds, tag); 26009c9dc39aSek DBUF_VERIFY(db); 2601fa9e4066Sahrens mutex_exit(&db->db_mtx); 2602fa9e4066Sahrens 2603fa9e4066Sahrens /* NOTE: we can't rele the parent until after we drop the db_mtx */ 2604c543ec06Sahrens if (parent) 2605ea8dc4b6Seschrock dbuf_rele(parent, NULL); 2606fa9e4066Sahrens 2607744947dcSTom Erickson ASSERT3P(DB_DNODE(db), ==, dn); 2608fa9e4066Sahrens ASSERT3U(db->db_blkid, ==, blkid); 2609fa9e4066Sahrens ASSERT3U(db->db_level, ==, level); 2610fa9e4066Sahrens *dbp = db; 2611fa9e4066Sahrens 2612fa9e4066Sahrens return (0); 2613fa9e4066Sahrens } 2614fa9e4066Sahrens 2615fa9e4066Sahrens dmu_buf_impl_t * 2616ea8dc4b6Seschrock dbuf_hold(dnode_t *dn, uint64_t blkid, void *tag) 2617fa9e4066Sahrens { 2618a2cdcdd2SPaul Dagnelie return (dbuf_hold_level(dn, 0, blkid, tag)); 2619fa9e4066Sahrens } 2620fa9e4066Sahrens 2621fa9e4066Sahrens dmu_buf_impl_t * 2622fa9e4066Sahrens dbuf_hold_level(dnode_t *dn, int level, uint64_t blkid, void *tag) 2623fa9e4066Sahrens { 2624fa9e4066Sahrens dmu_buf_impl_t *db; 2625a2cdcdd2SPaul Dagnelie int err = dbuf_hold_impl(dn, level, blkid, FALSE, FALSE, tag, &db); 2626ea8dc4b6Seschrock return (err ? NULL : db); 2627fa9e4066Sahrens } 2628fa9e4066Sahrens 26291934e92fSmaybee void 2630ea8dc4b6Seschrock dbuf_create_bonus(dnode_t *dn) 2631fa9e4066Sahrens { 2632ea8dc4b6Seschrock ASSERT(RW_WRITE_HELD(&dn->dn_struct_rwlock)); 2633ea8dc4b6Seschrock 2634ea8dc4b6Seschrock ASSERT(dn->dn_bonus == NULL); 26350a586ceaSMark Shellenbaum dn->dn_bonus = dbuf_create(dn, 0, DMU_BONUS_BLKID, dn->dn_dbuf, NULL); 26360a586ceaSMark Shellenbaum } 26370a586ceaSMark Shellenbaum 26380a586ceaSMark Shellenbaum int 26390a586ceaSMark Shellenbaum dbuf_spill_set_blksz(dmu_buf_t *db_fake, uint64_t blksz, dmu_tx_t *tx) 26400a586ceaSMark Shellenbaum { 26410a586ceaSMark Shellenbaum dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 2642744947dcSTom Erickson dnode_t *dn; 2643744947dcSTom Erickson 26440a586ceaSMark Shellenbaum if (db->db_blkid != DMU_SPILL_BLKID) 2645be6fd75aSMatthew Ahrens return (SET_ERROR(ENOTSUP)); 26460a586ceaSMark Shellenbaum if (blksz == 0) 26470a586ceaSMark Shellenbaum blksz = SPA_MINBLOCKSIZE; 2648b5152584SMatthew Ahrens ASSERT3U(blksz, <=, spa_maxblocksize(dmu_objset_spa(db->db_objset))); 2649b5152584SMatthew Ahrens blksz = P2ROUNDUP(blksz, SPA_MINBLOCKSIZE); 26500a586ceaSMark Shellenbaum 2651744947dcSTom Erickson DB_DNODE_ENTER(db); 2652744947dcSTom Erickson dn = DB_DNODE(db); 2653744947dcSTom Erickson rw_enter(&dn->dn_struct_rwlock, RW_WRITER); 26540a586ceaSMark Shellenbaum dbuf_new_size(db, blksz, tx); 2655744947dcSTom Erickson rw_exit(&dn->dn_struct_rwlock); 2656744947dcSTom Erickson DB_DNODE_EXIT(db); 26570a586ceaSMark Shellenbaum 26580a586ceaSMark Shellenbaum return (0); 26590a586ceaSMark Shellenbaum } 26600a586ceaSMark Shellenbaum 26610a586ceaSMark Shellenbaum void 26620a586ceaSMark Shellenbaum dbuf_rm_spill(dnode_t *dn, dmu_tx_t *tx) 26630a586ceaSMark Shellenbaum { 26640a586ceaSMark Shellenbaum dbuf_free_range(dn, DMU_SPILL_BLKID, DMU_SPILL_BLKID, tx); 2665fa9e4066Sahrens } 2666fa9e4066Sahrens 2667ea8dc4b6Seschrock #pragma weak dmu_buf_add_ref = dbuf_add_ref 2668fa9e4066Sahrens void 2669fa9e4066Sahrens dbuf_add_ref(dmu_buf_impl_t *db, void *tag) 2670fa9e4066Sahrens { 2671ea8dc4b6Seschrock int64_t holds = refcount_add(&db->db_holds, tag); 2672dcbf3bd6SGeorge Wilson ASSERT3S(holds, >, 1); 2673fa9e4066Sahrens } 2674fa9e4066Sahrens 2675e57a022bSJustin T. Gibbs #pragma weak dmu_buf_try_add_ref = dbuf_try_add_ref 2676e57a022bSJustin T. Gibbs boolean_t 2677e57a022bSJustin T. Gibbs dbuf_try_add_ref(dmu_buf_t *db_fake, objset_t *os, uint64_t obj, uint64_t blkid, 2678e57a022bSJustin T. Gibbs void *tag) 2679e57a022bSJustin T. Gibbs { 2680e57a022bSJustin T. Gibbs dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 2681e57a022bSJustin T. Gibbs dmu_buf_impl_t *found_db; 2682e57a022bSJustin T. Gibbs boolean_t result = B_FALSE; 2683e57a022bSJustin T. Gibbs 2684e57a022bSJustin T. Gibbs if (db->db_blkid == DMU_BONUS_BLKID) 2685e57a022bSJustin T. Gibbs found_db = dbuf_find_bonus(os, obj); 2686e57a022bSJustin T. Gibbs else 2687e57a022bSJustin T. Gibbs found_db = dbuf_find(os, obj, 0, blkid); 2688e57a022bSJustin T. Gibbs 2689e57a022bSJustin T. Gibbs if (found_db != NULL) { 2690e57a022bSJustin T. Gibbs if (db == found_db && dbuf_refcount(db) > db->db_dirtycnt) { 2691e57a022bSJustin T. Gibbs (void) refcount_add(&db->db_holds, tag); 2692e57a022bSJustin T. Gibbs result = B_TRUE; 2693e57a022bSJustin T. Gibbs } 2694e57a022bSJustin T. Gibbs mutex_exit(&db->db_mtx); 2695e57a022bSJustin T. Gibbs } 2696e57a022bSJustin T. Gibbs return (result); 2697e57a022bSJustin T. Gibbs } 2698e57a022bSJustin T. Gibbs 2699744947dcSTom Erickson /* 2700744947dcSTom Erickson * If you call dbuf_rele() you had better not be referencing the dnode handle 2701744947dcSTom Erickson * unless you have some other direct or indirect hold on the dnode. (An indirect 2702744947dcSTom Erickson * hold is a hold on one of the dnode's dbufs, including the bonus buffer.) 2703744947dcSTom Erickson * Without that, the dbuf_rele() could lead to a dnode_rele() followed by the 2704744947dcSTom Erickson * dnode's parent dbuf evicting its dnode handles. 2705744947dcSTom Erickson */ 2706fa9e4066Sahrens void 2707ea8dc4b6Seschrock dbuf_rele(dmu_buf_impl_t *db, void *tag) 2708b24ab676SJeff Bonwick { 2709b24ab676SJeff Bonwick mutex_enter(&db->db_mtx); 2710b24ab676SJeff Bonwick dbuf_rele_and_unlock(db, tag); 2711b24ab676SJeff Bonwick } 2712b24ab676SJeff Bonwick 271343466aaeSMax Grossman void 271443466aaeSMax Grossman dmu_buf_rele(dmu_buf_t *db, void *tag) 271543466aaeSMax Grossman { 271643466aaeSMax Grossman dbuf_rele((dmu_buf_impl_t *)db, tag); 271743466aaeSMax Grossman } 271843466aaeSMax Grossman 2719b24ab676SJeff Bonwick /* 2720b24ab676SJeff Bonwick * dbuf_rele() for an already-locked dbuf. This is necessary to allow 2721b24ab676SJeff Bonwick * db_dirtycnt and db_holds to be updated atomically. 2722b24ab676SJeff Bonwick */ 2723b24ab676SJeff Bonwick void 2724b24ab676SJeff Bonwick dbuf_rele_and_unlock(dmu_buf_impl_t *db, void *tag) 2725fa9e4066Sahrens { 2726fa9e4066Sahrens int64_t holds; 2727fa9e4066Sahrens 2728b24ab676SJeff Bonwick ASSERT(MUTEX_HELD(&db->db_mtx)); 27299c9dc39aSek DBUF_VERIFY(db); 2730fa9e4066Sahrens 2731744947dcSTom Erickson /* 2732744947dcSTom Erickson * Remove the reference to the dbuf before removing its hold on the 2733744947dcSTom Erickson * dnode so we can guarantee in dnode_move() that a referenced bonus 2734744947dcSTom Erickson * buffer has a corresponding dnode hold. 2735744947dcSTom Erickson */ 2736fa9e4066Sahrens holds = refcount_remove(&db->db_holds, tag); 2737ea8dc4b6Seschrock ASSERT(holds >= 0); 2738ea8dc4b6Seschrock 2739c717a561Smaybee /* 2740c717a561Smaybee * We can't freeze indirects if there is a possibility that they 2741c717a561Smaybee * may be modified in the current syncing context. 2742c717a561Smaybee */ 2743dcbf3bd6SGeorge Wilson if (db->db_buf != NULL && 2744dcbf3bd6SGeorge Wilson holds == (db->db_level == 0 ? db->db_dirtycnt : 0)) { 27456b4acc8bSahrens arc_buf_freeze(db->db_buf); 2746dcbf3bd6SGeorge Wilson } 27476b4acc8bSahrens 2748ea8dc4b6Seschrock if (holds == db->db_dirtycnt && 2749d2058105SJustin T. Gibbs db->db_level == 0 && db->db_user_immediate_evict) 2750ea8dc4b6Seschrock dbuf_evict_user(db); 2751fa9e4066Sahrens 2752fa9e4066Sahrens if (holds == 0) { 27530a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 2754cd485b49SJustin T. Gibbs dnode_t *dn; 2755d2058105SJustin T. Gibbs boolean_t evict_dbuf = db->db_pending_evict; 2756744947dcSTom Erickson 2757744947dcSTom Erickson /* 2758cd485b49SJustin T. Gibbs * If the dnode moves here, we cannot cross this 2759cd485b49SJustin T. Gibbs * barrier until the move completes. 2760744947dcSTom Erickson */ 2761744947dcSTom Erickson DB_DNODE_ENTER(db); 2762cd485b49SJustin T. Gibbs 2763cd485b49SJustin T. Gibbs dn = DB_DNODE(db); 2764cd485b49SJustin T. Gibbs atomic_dec_32(&dn->dn_dbufs_count); 2765cd485b49SJustin T. Gibbs 2766cd485b49SJustin T. Gibbs /* 2767cd485b49SJustin T. Gibbs * Decrementing the dbuf count means that the bonus 2768cd485b49SJustin T. Gibbs * buffer's dnode hold is no longer discounted in 2769cd485b49SJustin T. Gibbs * dnode_move(). The dnode cannot move until after 2770d2058105SJustin T. Gibbs * the dnode_rele() below. 2771cd485b49SJustin T. Gibbs */ 2772744947dcSTom Erickson DB_DNODE_EXIT(db); 2773cd485b49SJustin T. Gibbs 2774cd485b49SJustin T. Gibbs /* 2775cd485b49SJustin T. Gibbs * Do not reference db after its lock is dropped. 2776cd485b49SJustin T. Gibbs * Another thread may evict it. 2777cd485b49SJustin T. Gibbs */ 2778cd485b49SJustin T. Gibbs mutex_exit(&db->db_mtx); 2779cd485b49SJustin T. Gibbs 2780d2058105SJustin T. Gibbs if (evict_dbuf) 2781cd485b49SJustin T. Gibbs dnode_evict_bonus(dn); 2782d2058105SJustin T. Gibbs 2783d2058105SJustin T. Gibbs dnode_rele(dn, db); 2784ea8dc4b6Seschrock } else if (db->db_buf == NULL) { 2785ea8dc4b6Seschrock /* 2786ea8dc4b6Seschrock * This is a special case: we never associated this 2787ea8dc4b6Seschrock * dbuf with any data allocated from the ARC. 2788ea8dc4b6Seschrock */ 278982c9918fSTim Haley ASSERT(db->db_state == DB_UNCACHED || 279082c9918fSTim Haley db->db_state == DB_NOFILL); 2791dcbf3bd6SGeorge Wilson dbuf_destroy(db); 27926b4acc8bSahrens } else if (arc_released(db->db_buf)) { 2793ea8dc4b6Seschrock /* 2794ea8dc4b6Seschrock * This dbuf has anonymous data associated with it. 2795ea8dc4b6Seschrock */ 2796dcbf3bd6SGeorge Wilson dbuf_destroy(db); 2797ea8dc4b6Seschrock } else { 2798dcbf3bd6SGeorge Wilson boolean_t do_arc_evict = B_FALSE; 2799dcbf3bd6SGeorge Wilson blkptr_t bp; 2800dcbf3bd6SGeorge Wilson spa_t *spa = dmu_objset_spa(db->db_objset); 2801dcbf3bd6SGeorge Wilson 2802dcbf3bd6SGeorge Wilson if (!DBUF_IS_CACHEABLE(db) && 2803dcbf3bd6SGeorge Wilson db->db_blkptr != NULL && 2804dcbf3bd6SGeorge Wilson !BP_IS_HOLE(db->db_blkptr) && 2805dcbf3bd6SGeorge Wilson !BP_IS_EMBEDDED(db->db_blkptr)) { 2806dcbf3bd6SGeorge Wilson do_arc_evict = B_TRUE; 2807dcbf3bd6SGeorge Wilson bp = *db->db_blkptr; 2808dcbf3bd6SGeorge Wilson } 28099253d63dSGeorge Wilson 2810dcbf3bd6SGeorge Wilson if (!DBUF_IS_CACHEABLE(db) || 2811dcbf3bd6SGeorge Wilson db->db_pending_evict) { 2812dcbf3bd6SGeorge Wilson dbuf_destroy(db); 2813dcbf3bd6SGeorge Wilson } else if (!multilist_link_active(&db->db_cache_link)) { 2814dcbf3bd6SGeorge Wilson multilist_insert(&dbuf_cache, db); 2815dcbf3bd6SGeorge Wilson (void) refcount_add_many(&dbuf_cache_size, 2816dcbf3bd6SGeorge Wilson db->db.db_size, db); 28173baa08fcSek mutex_exit(&db->db_mtx); 2818dcbf3bd6SGeorge Wilson 2819dcbf3bd6SGeorge Wilson dbuf_evict_notify(); 2820bbfa8ea8SMatthew Ahrens } 2821dcbf3bd6SGeorge Wilson 2822dcbf3bd6SGeorge Wilson if (do_arc_evict) 2823dcbf3bd6SGeorge Wilson arc_freed(spa, &bp); 2824ea8dc4b6Seschrock } 2825fa9e4066Sahrens } else { 2826fa9e4066Sahrens mutex_exit(&db->db_mtx); 2827fa9e4066Sahrens } 2828dcbf3bd6SGeorge Wilson 2829fa9e4066Sahrens } 2830fa9e4066Sahrens 2831fa9e4066Sahrens #pragma weak dmu_buf_refcount = dbuf_refcount 2832fa9e4066Sahrens uint64_t 2833fa9e4066Sahrens dbuf_refcount(dmu_buf_impl_t *db) 2834fa9e4066Sahrens { 2835fa9e4066Sahrens return (refcount_count(&db->db_holds)); 2836fa9e4066Sahrens } 2837fa9e4066Sahrens 2838fa9e4066Sahrens void * 2839bc9014e6SJustin Gibbs dmu_buf_replace_user(dmu_buf_t *db_fake, dmu_buf_user_t *old_user, 2840bc9014e6SJustin Gibbs dmu_buf_user_t *new_user) 2841fa9e4066Sahrens { 2842bc9014e6SJustin Gibbs dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 2843bc9014e6SJustin Gibbs 2844bc9014e6SJustin Gibbs mutex_enter(&db->db_mtx); 2845bc9014e6SJustin Gibbs dbuf_verify_user(db, DBVU_NOT_EVICTING); 2846bc9014e6SJustin Gibbs if (db->db_user == old_user) 2847bc9014e6SJustin Gibbs db->db_user = new_user; 2848bc9014e6SJustin Gibbs else 2849bc9014e6SJustin Gibbs old_user = db->db_user; 2850bc9014e6SJustin Gibbs dbuf_verify_user(db, DBVU_NOT_EVICTING); 2851bc9014e6SJustin Gibbs mutex_exit(&db->db_mtx); 2852bc9014e6SJustin Gibbs 2853bc9014e6SJustin Gibbs return (old_user); 2854fa9e4066Sahrens } 2855fa9e4066Sahrens 2856fa9e4066Sahrens void * 2857bc9014e6SJustin Gibbs dmu_buf_set_user(dmu_buf_t *db_fake, dmu_buf_user_t *user) 2858fa9e4066Sahrens { 2859bc9014e6SJustin Gibbs return (dmu_buf_replace_user(db_fake, NULL, user)); 2860fa9e4066Sahrens } 2861fa9e4066Sahrens 2862fa9e4066Sahrens void * 2863bc9014e6SJustin Gibbs dmu_buf_set_user_ie(dmu_buf_t *db_fake, dmu_buf_user_t *user) 2864fa9e4066Sahrens { 2865fa9e4066Sahrens dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 2866fa9e4066Sahrens 2867d2058105SJustin T. Gibbs db->db_user_immediate_evict = TRUE; 2868bc9014e6SJustin Gibbs return (dmu_buf_set_user(db_fake, user)); 2869bc9014e6SJustin Gibbs } 2870fa9e4066Sahrens 2871bc9014e6SJustin Gibbs void * 2872bc9014e6SJustin Gibbs dmu_buf_remove_user(dmu_buf_t *db_fake, dmu_buf_user_t *user) 2873bc9014e6SJustin Gibbs { 2874bc9014e6SJustin Gibbs return (dmu_buf_replace_user(db_fake, user, NULL)); 2875fa9e4066Sahrens } 2876fa9e4066Sahrens 2877fa9e4066Sahrens void * 2878fa9e4066Sahrens dmu_buf_get_user(dmu_buf_t *db_fake) 2879fa9e4066Sahrens { 2880fa9e4066Sahrens dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 2881fa9e4066Sahrens 2882bc9014e6SJustin Gibbs dbuf_verify_user(db, DBVU_NOT_EVICTING); 2883bc9014e6SJustin Gibbs return (db->db_user); 2884bc9014e6SJustin Gibbs } 2885bc9014e6SJustin Gibbs 2886bc9014e6SJustin Gibbs void 2887bc9014e6SJustin Gibbs dmu_buf_user_evict_wait() 2888bc9014e6SJustin Gibbs { 2889bc9014e6SJustin Gibbs taskq_wait(dbu_evict_taskq); 2890fa9e4066Sahrens } 2891fa9e4066Sahrens 28923d692628SSanjeev Bagewadi boolean_t 28933d692628SSanjeev Bagewadi dmu_buf_freeable(dmu_buf_t *dbuf) 28943d692628SSanjeev Bagewadi { 28953d692628SSanjeev Bagewadi boolean_t res = B_FALSE; 28963d692628SSanjeev Bagewadi dmu_buf_impl_t *db = (dmu_buf_impl_t *)dbuf; 28973d692628SSanjeev Bagewadi 28983d692628SSanjeev Bagewadi if (db->db_blkptr) 28993d692628SSanjeev Bagewadi res = dsl_dataset_block_freeable(db->db_objset->os_dsl_dataset, 2900c7cd2421SGeorge Wilson db->db_blkptr, db->db_blkptr->blk_birth); 29013d692628SSanjeev Bagewadi 29023d692628SSanjeev Bagewadi return (res); 29033d692628SSanjeev Bagewadi } 29043d692628SSanjeev Bagewadi 290580901aeaSGeorge Wilson blkptr_t * 290680901aeaSGeorge Wilson dmu_buf_get_blkptr(dmu_buf_t *db) 290780901aeaSGeorge Wilson { 290880901aeaSGeorge Wilson dmu_buf_impl_t *dbi = (dmu_buf_impl_t *)db; 290980901aeaSGeorge Wilson return (dbi->db_blkptr); 291080901aeaSGeorge Wilson } 291180901aeaSGeorge Wilson 2912ae972795SMatthew Ahrens objset_t * 2913ae972795SMatthew Ahrens dmu_buf_get_objset(dmu_buf_t *db) 2914ae972795SMatthew Ahrens { 2915ae972795SMatthew Ahrens dmu_buf_impl_t *dbi = (dmu_buf_impl_t *)db; 2916ae972795SMatthew Ahrens return (dbi->db_objset); 2917ae972795SMatthew Ahrens } 2918ae972795SMatthew Ahrens 291979d72832SMatthew Ahrens dnode_t * 292079d72832SMatthew Ahrens dmu_buf_dnode_enter(dmu_buf_t *db) 292179d72832SMatthew Ahrens { 292279d72832SMatthew Ahrens dmu_buf_impl_t *dbi = (dmu_buf_impl_t *)db; 292379d72832SMatthew Ahrens DB_DNODE_ENTER(dbi); 292479d72832SMatthew Ahrens return (DB_DNODE(dbi)); 292579d72832SMatthew Ahrens } 292679d72832SMatthew Ahrens 292779d72832SMatthew Ahrens void 292879d72832SMatthew Ahrens dmu_buf_dnode_exit(dmu_buf_t *db) 292979d72832SMatthew Ahrens { 293079d72832SMatthew Ahrens dmu_buf_impl_t *dbi = (dmu_buf_impl_t *)db; 293179d72832SMatthew Ahrens DB_DNODE_EXIT(dbi); 293279d72832SMatthew Ahrens } 293379d72832SMatthew Ahrens 2934c717a561Smaybee static void 2935c717a561Smaybee dbuf_check_blkptr(dnode_t *dn, dmu_buf_impl_t *db) 2936fa9e4066Sahrens { 2937c717a561Smaybee /* ASSERT(dmu_tx_is_syncing(tx) */ 2938c717a561Smaybee ASSERT(MUTEX_HELD(&db->db_mtx)); 2939c717a561Smaybee 2940c717a561Smaybee if (db->db_blkptr != NULL) 2941c717a561Smaybee return; 2942c717a561Smaybee 29430a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) { 29440a586ceaSMark Shellenbaum db->db_blkptr = &dn->dn_phys->dn_spill; 29450a586ceaSMark Shellenbaum BP_ZERO(db->db_blkptr); 29460a586ceaSMark Shellenbaum return; 29470a586ceaSMark Shellenbaum } 2948c717a561Smaybee if (db->db_level == dn->dn_phys->dn_nlevels-1) { 2949c717a561Smaybee /* 2950c717a561Smaybee * This buffer was allocated at a time when there was 2951c717a561Smaybee * no available blkptrs from the dnode, or it was 2952c717a561Smaybee * inappropriate to hook it in (i.e., nlevels mis-match). 2953c717a561Smaybee */ 2954c717a561Smaybee ASSERT(db->db_blkid < dn->dn_phys->dn_nblkptr); 2955c717a561Smaybee ASSERT(db->db_parent == NULL); 2956c717a561Smaybee db->db_parent = dn->dn_dbuf; 2957c717a561Smaybee db->db_blkptr = &dn->dn_phys->dn_blkptr[db->db_blkid]; 2958c717a561Smaybee DBUF_VERIFY(db); 2959c717a561Smaybee } else { 2960c717a561Smaybee dmu_buf_impl_t *parent = db->db_parent; 2961c717a561Smaybee int epbs = dn->dn_phys->dn_indblkshift - SPA_BLKPTRSHIFT; 2962c717a561Smaybee 2963c717a561Smaybee ASSERT(dn->dn_phys->dn_nlevels > 1); 2964c717a561Smaybee if (parent == NULL) { 2965c717a561Smaybee mutex_exit(&db->db_mtx); 2966c717a561Smaybee rw_enter(&dn->dn_struct_rwlock, RW_READER); 2967a2cdcdd2SPaul Dagnelie parent = dbuf_hold_level(dn, db->db_level + 1, 2968a2cdcdd2SPaul Dagnelie db->db_blkid >> epbs, db); 2969c717a561Smaybee rw_exit(&dn->dn_struct_rwlock); 2970c717a561Smaybee mutex_enter(&db->db_mtx); 2971c717a561Smaybee db->db_parent = parent; 2972c717a561Smaybee } 2973c717a561Smaybee db->db_blkptr = (blkptr_t *)parent->db.db_data + 2974c717a561Smaybee (db->db_blkid & ((1ULL << epbs) - 1)); 2975c717a561Smaybee DBUF_VERIFY(db); 2976c717a561Smaybee } 2977c717a561Smaybee } 2978c717a561Smaybee 2979c717a561Smaybee static void 2980c717a561Smaybee dbuf_sync_indirect(dbuf_dirty_record_t *dr, dmu_tx_t *tx) 2981c717a561Smaybee { 2982c717a561Smaybee dmu_buf_impl_t *db = dr->dr_dbuf; 2983744947dcSTom Erickson dnode_t *dn; 2984c717a561Smaybee zio_t *zio; 2985c717a561Smaybee 2986c717a561Smaybee ASSERT(dmu_tx_is_syncing(tx)); 2987c717a561Smaybee 2988c717a561Smaybee dprintf_dbuf_bp(db, db->db_blkptr, "blkptr=%p", db->db_blkptr); 2989c717a561Smaybee 2990c717a561Smaybee mutex_enter(&db->db_mtx); 2991c717a561Smaybee 2992c717a561Smaybee ASSERT(db->db_level > 0); 2993c717a561Smaybee DBUF_VERIFY(db); 2994c717a561Smaybee 29953e30c24aSWill Andrews /* Read the block if it hasn't been read yet. */ 2996c717a561Smaybee if (db->db_buf == NULL) { 2997c717a561Smaybee mutex_exit(&db->db_mtx); 2998c717a561Smaybee (void) dbuf_read(db, NULL, DB_RF_MUST_SUCCEED); 2999c717a561Smaybee mutex_enter(&db->db_mtx); 3000c717a561Smaybee } 3001c717a561Smaybee ASSERT3U(db->db_state, ==, DB_CACHED); 3002c717a561Smaybee ASSERT(db->db_buf != NULL); 3003c717a561Smaybee 3004744947dcSTom Erickson DB_DNODE_ENTER(db); 3005744947dcSTom Erickson dn = DB_DNODE(db); 30063e30c24aSWill Andrews /* Indirect block size must match what the dnode thinks it is. */ 3007744947dcSTom Erickson ASSERT3U(db->db.db_size, ==, 1<<dn->dn_phys->dn_indblkshift); 3008c717a561Smaybee dbuf_check_blkptr(dn, db); 3009744947dcSTom Erickson DB_DNODE_EXIT(db); 3010c717a561Smaybee 30113e30c24aSWill Andrews /* Provide the pending dirty record to child dbufs */ 3012c717a561Smaybee db->db_data_pending = dr; 3013c717a561Smaybee 3014af2c4821Smaybee mutex_exit(&db->db_mtx); 3015088f3894Sahrens dbuf_write(dr, db->db_buf, tx); 3016c717a561Smaybee 3017c717a561Smaybee zio = dr->dr_zio; 3018c717a561Smaybee mutex_enter(&dr->dt.di.dr_mtx); 301946e1baa6SMatthew Ahrens dbuf_sync_list(&dr->dt.di.dr_children, db->db_level - 1, tx); 3020c717a561Smaybee ASSERT(list_head(&dr->dt.di.dr_children) == NULL); 3021c717a561Smaybee mutex_exit(&dr->dt.di.dr_mtx); 3022c717a561Smaybee zio_nowait(zio); 3023c717a561Smaybee } 3024c717a561Smaybee 3025c717a561Smaybee static void 3026c717a561Smaybee dbuf_sync_leaf(dbuf_dirty_record_t *dr, dmu_tx_t *tx) 3027c717a561Smaybee { 3028c717a561Smaybee arc_buf_t **datap = &dr->dt.dl.dr_data; 3029c717a561Smaybee dmu_buf_impl_t *db = dr->dr_dbuf; 3030744947dcSTom Erickson dnode_t *dn; 3031744947dcSTom Erickson objset_t *os; 3032c717a561Smaybee uint64_t txg = tx->tx_txg; 3033fa9e4066Sahrens 3034fa9e4066Sahrens ASSERT(dmu_tx_is_syncing(tx)); 3035fa9e4066Sahrens 3036fa9e4066Sahrens dprintf_dbuf_bp(db, db->db_blkptr, "blkptr=%p", db->db_blkptr); 3037fa9e4066Sahrens 3038fa9e4066Sahrens mutex_enter(&db->db_mtx); 3039fa9e4066Sahrens /* 3040fa9e4066Sahrens * To be synced, we must be dirtied. But we 3041fa9e4066Sahrens * might have been freed after the dirty. 3042fa9e4066Sahrens */ 3043fa9e4066Sahrens if (db->db_state == DB_UNCACHED) { 3044fa9e4066Sahrens /* This buffer has been freed since it was dirtied */ 3045fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 3046fa9e4066Sahrens } else if (db->db_state == DB_FILL) { 3047fa9e4066Sahrens /* This buffer was freed and is now being re-filled */ 3048c717a561Smaybee ASSERT(db->db.db_data != dr->dt.dl.dr_data); 3049fa9e4066Sahrens } else { 305082c9918fSTim Haley ASSERT(db->db_state == DB_CACHED || db->db_state == DB_NOFILL); 3051fa9e4066Sahrens } 30529c9dc39aSek DBUF_VERIFY(db); 3053fa9e4066Sahrens 3054744947dcSTom Erickson DB_DNODE_ENTER(db); 3055744947dcSTom Erickson dn = DB_DNODE(db); 3056744947dcSTom Erickson 30570a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) { 30580a586ceaSMark Shellenbaum mutex_enter(&dn->dn_mtx); 30590a586ceaSMark Shellenbaum dn->dn_phys->dn_flags |= DNODE_FLAG_SPILL_BLKPTR; 30600a586ceaSMark Shellenbaum mutex_exit(&dn->dn_mtx); 30610a586ceaSMark Shellenbaum } 30620a586ceaSMark Shellenbaum 3063fa9e4066Sahrens /* 3064c717a561Smaybee * If this is a bonus buffer, simply copy the bonus data into the 3065c717a561Smaybee * dnode. It will be written out when the dnode is synced (and it 3066c717a561Smaybee * will be synced, since it must have been dirty for dbuf_sync to 3067c717a561Smaybee * be called). 3068fa9e4066Sahrens */ 30690a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 3070c717a561Smaybee dbuf_dirty_record_t **drp; 30711934e92fSmaybee 3072ea8dc4b6Seschrock ASSERT(*datap != NULL); 3073fb09f5aaSMadhav Suresh ASSERT0(db->db_level); 3074ea8dc4b6Seschrock ASSERT3U(dn->dn_phys->dn_bonuslen, <=, DN_MAX_BONUSLEN); 3075ea8dc4b6Seschrock bcopy(*datap, DN_BONUS(dn->dn_phys), dn->dn_phys->dn_bonuslen); 3076744947dcSTom Erickson DB_DNODE_EXIT(db); 3077744947dcSTom Erickson 30780e8c6158Smaybee if (*datap != db->db.db_data) { 3079ea8dc4b6Seschrock zio_buf_free(*datap, DN_MAX_BONUSLEN); 30805a98e54bSBrendan Gregg - Sun Microsystems arc_space_return(DN_MAX_BONUSLEN, ARC_SPACE_OTHER); 30810e8c6158Smaybee } 3082ea8dc4b6Seschrock db->db_data_pending = NULL; 3083c717a561Smaybee drp = &db->db_last_dirty; 3084c717a561Smaybee while (*drp != dr) 3085c717a561Smaybee drp = &(*drp)->dr_next; 308617f17c2dSbonwick ASSERT(dr->dr_next == NULL); 3087b24ab676SJeff Bonwick ASSERT(dr->dr_dbuf == db); 308817f17c2dSbonwick *drp = dr->dr_next; 3089c717a561Smaybee kmem_free(dr, sizeof (dbuf_dirty_record_t)); 3090ea8dc4b6Seschrock ASSERT(db->db_dirtycnt > 0); 3091ea8dc4b6Seschrock db->db_dirtycnt -= 1; 3092b24ab676SJeff Bonwick dbuf_rele_and_unlock(db, (void *)(uintptr_t)txg); 3093ea8dc4b6Seschrock return; 3094ea8dc4b6Seschrock } 3095ea8dc4b6Seschrock 3096744947dcSTom Erickson os = dn->dn_objset; 3097744947dcSTom Erickson 3098f82bfe17Sgw /* 3099f82bfe17Sgw * This function may have dropped the db_mtx lock allowing a dmu_sync 3100f82bfe17Sgw * operation to sneak in. As a result, we need to ensure that we 3101f82bfe17Sgw * don't check the dr_override_state until we have returned from 3102f82bfe17Sgw * dbuf_check_blkptr. 3103f82bfe17Sgw */ 3104f82bfe17Sgw dbuf_check_blkptr(dn, db); 3105f82bfe17Sgw 3106c717a561Smaybee /* 3107744947dcSTom Erickson * If this buffer is in the middle of an immediate write, 3108c717a561Smaybee * wait for the synchronous IO to complete. 3109c717a561Smaybee */ 3110c717a561Smaybee while (dr->dt.dl.dr_override_state == DR_IN_DMU_SYNC) { 3111c717a561Smaybee ASSERT(dn->dn_object != DMU_META_DNODE_OBJECT); 3112c717a561Smaybee cv_wait(&db->db_changed, &db->db_mtx); 3113c717a561Smaybee ASSERT(dr->dt.dl.dr_override_state != DR_NOT_OVERRIDDEN); 3114c717a561Smaybee } 3115c5c6ffa0Smaybee 3116ab69d62fSMatthew Ahrens if (db->db_state != DB_NOFILL && 3117ab69d62fSMatthew Ahrens dn->dn_object != DMU_META_DNODE_OBJECT && 3118ab69d62fSMatthew Ahrens refcount_count(&db->db_holds) > 1 && 3119b24ab676SJeff Bonwick dr->dt.dl.dr_override_state != DR_OVERRIDDEN && 3120ab69d62fSMatthew Ahrens *datap == db->db_buf) { 3121ab69d62fSMatthew Ahrens /* 3122ab69d62fSMatthew Ahrens * If this buffer is currently "in use" (i.e., there 3123ab69d62fSMatthew Ahrens * are active holds and db_data still references it), 3124ab69d62fSMatthew Ahrens * then make a copy before we start the write so that 3125ab69d62fSMatthew Ahrens * any modifications from the open txg will not leak 3126ab69d62fSMatthew Ahrens * into this write. 3127ab69d62fSMatthew Ahrens * 3128ab69d62fSMatthew Ahrens * NOTE: this copy does not need to be made for 3129ab69d62fSMatthew Ahrens * objects only modified in the syncing context (e.g. 3130ab69d62fSMatthew Ahrens * DNONE_DNODE blocks). 3131ab69d62fSMatthew Ahrens */ 3132ab69d62fSMatthew Ahrens int blksz = arc_buf_size(*datap); 3133ab69d62fSMatthew Ahrens arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 3134dcbf3bd6SGeorge Wilson *datap = arc_alloc_buf(os->os_spa, blksz, db, type); 3135ab69d62fSMatthew Ahrens bcopy(db->db.db_data, (*datap)->b_data, blksz); 313682c9918fSTim Haley } 3137c717a561Smaybee db->db_data_pending = dr; 3138fa9e4066Sahrens 3139c717a561Smaybee mutex_exit(&db->db_mtx); 3140fa9e4066Sahrens 3141088f3894Sahrens dbuf_write(dr, *datap, tx); 3142fa9e4066Sahrens 3143c717a561Smaybee ASSERT(!list_link_active(&dr->dr_dirty_node)); 3144744947dcSTom Erickson if (dn->dn_object == DMU_META_DNODE_OBJECT) { 3145c717a561Smaybee list_insert_tail(&dn->dn_dirty_records[txg&TXG_MASK], dr); 3146744947dcSTom Erickson DB_DNODE_EXIT(db); 3147744947dcSTom Erickson } else { 3148744947dcSTom Erickson /* 3149744947dcSTom Erickson * Although zio_nowait() does not "wait for an IO", it does 3150744947dcSTom Erickson * initiate the IO. If this is an empty write it seems plausible 3151744947dcSTom Erickson * that the IO could actually be completed before the nowait 3152744947dcSTom Erickson * returns. We need to DB_DNODE_EXIT() first in case 3153744947dcSTom Erickson * zio_nowait() invalidates the dbuf. 3154744947dcSTom Erickson */ 3155744947dcSTom Erickson DB_DNODE_EXIT(db); 3156c717a561Smaybee zio_nowait(dr->dr_zio); 3157744947dcSTom Erickson } 3158c717a561Smaybee } 315923b11526Smaybee 3160c717a561Smaybee void 316146e1baa6SMatthew Ahrens dbuf_sync_list(list_t *list, int level, dmu_tx_t *tx) 3162c717a561Smaybee { 3163c717a561Smaybee dbuf_dirty_record_t *dr; 3164c717a561Smaybee 3165c717a561Smaybee while (dr = list_head(list)) { 3166c717a561Smaybee if (dr->dr_zio != NULL) { 3167c717a561Smaybee /* 3168c717a561Smaybee * If we find an already initialized zio then we 3169c717a561Smaybee * are processing the meta-dnode, and we have finished. 3170c717a561Smaybee * The dbufs for all dnodes are put back on the list 3171c717a561Smaybee * during processing, so that we can zio_wait() 3172c717a561Smaybee * these IOs after initiating all child IOs. 3173c717a561Smaybee */ 3174c717a561Smaybee ASSERT3U(dr->dr_dbuf->db.db_object, ==, 3175c717a561Smaybee DMU_META_DNODE_OBJECT); 3176c717a561Smaybee break; 317723b11526Smaybee } 317846e1baa6SMatthew Ahrens if (dr->dr_dbuf->db_blkid != DMU_BONUS_BLKID && 317946e1baa6SMatthew Ahrens dr->dr_dbuf->db_blkid != DMU_SPILL_BLKID) { 318046e1baa6SMatthew Ahrens VERIFY3U(dr->dr_dbuf->db_level, ==, level); 318146e1baa6SMatthew Ahrens } 3182c717a561Smaybee list_remove(list, dr); 3183c717a561Smaybee if (dr->dr_dbuf->db_level > 0) 3184c717a561Smaybee dbuf_sync_indirect(dr, tx); 3185c717a561Smaybee else 3186c717a561Smaybee dbuf_sync_leaf(dr, tx); 318723b11526Smaybee } 3188c717a561Smaybee } 318923b11526Smaybee 3190fa9e4066Sahrens /* ARGSUSED */ 3191fa9e4066Sahrens static void 3192c717a561Smaybee dbuf_write_ready(zio_t *zio, arc_buf_t *buf, void *vdb) 3193fa9e4066Sahrens { 3194fa9e4066Sahrens dmu_buf_impl_t *db = vdb; 3195744947dcSTom Erickson dnode_t *dn; 3196e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 3197c717a561Smaybee blkptr_t *bp_orig = &zio->io_bp_orig; 3198b24ab676SJeff Bonwick spa_t *spa = zio->io_spa; 3199b24ab676SJeff Bonwick int64_t delta; 3200fa9e4066Sahrens uint64_t fill = 0; 3201b24ab676SJeff Bonwick int i; 3202fa9e4066Sahrens 320311ceac77SAlex Reece ASSERT3P(db->db_blkptr, !=, NULL); 320411ceac77SAlex Reece ASSERT3P(&db->db_data_pending->dr_bp_copy, ==, bp); 3205e14bb325SJeff Bonwick 3206744947dcSTom Erickson DB_DNODE_ENTER(db); 3207744947dcSTom Erickson dn = DB_DNODE(db); 3208b24ab676SJeff Bonwick delta = bp_get_dsize_sync(spa, bp) - bp_get_dsize_sync(spa, bp_orig); 3209b24ab676SJeff Bonwick dnode_diduse_space(dn, delta - zio->io_prev_space_delta); 3210b24ab676SJeff Bonwick zio->io_prev_space_delta = delta; 3211fa9e4066Sahrens 321243466aaeSMax Grossman if (bp->blk_birth != 0) { 321343466aaeSMax Grossman ASSERT((db->db_blkid != DMU_SPILL_BLKID && 321443466aaeSMax Grossman BP_GET_TYPE(bp) == dn->dn_type) || 321543466aaeSMax Grossman (db->db_blkid == DMU_SPILL_BLKID && 32165d7b4d43SMatthew Ahrens BP_GET_TYPE(bp) == dn->dn_bonustype) || 32175d7b4d43SMatthew Ahrens BP_IS_EMBEDDED(bp)); 321843466aaeSMax Grossman ASSERT(BP_GET_LEVEL(bp) == db->db_level); 3219c717a561Smaybee } 3220c5c6ffa0Smaybee 3221c717a561Smaybee mutex_enter(&db->db_mtx); 3222fa9e4066Sahrens 32230a586ceaSMark Shellenbaum #ifdef ZFS_DEBUG 32240a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) { 32250a586ceaSMark Shellenbaum ASSERT(dn->dn_phys->dn_flags & DNODE_FLAG_SPILL_BLKPTR); 322611ceac77SAlex Reece ASSERT(!(BP_IS_HOLE(bp)) && 32270a586ceaSMark Shellenbaum db->db_blkptr == &dn->dn_phys->dn_spill); 32280a586ceaSMark Shellenbaum } 32290a586ceaSMark Shellenbaum #endif 32300a586ceaSMark Shellenbaum 3231fa9e4066Sahrens if (db->db_level == 0) { 3232fa9e4066Sahrens mutex_enter(&dn->dn_mtx); 32330a586ceaSMark Shellenbaum if (db->db_blkid > dn->dn_phys->dn_maxblkid && 32340a586ceaSMark Shellenbaum db->db_blkid != DMU_SPILL_BLKID) 3235fa9e4066Sahrens dn->dn_phys->dn_maxblkid = db->db_blkid; 3236fa9e4066Sahrens mutex_exit(&dn->dn_mtx); 3237fa9e4066Sahrens 3238fa9e4066Sahrens if (dn->dn_type == DMU_OT_DNODE) { 3239fa9e4066Sahrens dnode_phys_t *dnp = db->db.db_data; 3240fa9e4066Sahrens for (i = db->db.db_size >> DNODE_SHIFT; i > 0; 3241fa9e4066Sahrens i--, dnp++) { 3242fa9e4066Sahrens if (dnp->dn_type != DMU_OT_NONE) 3243fa9e4066Sahrens fill++; 3244fa9e4066Sahrens } 3245fa9e4066Sahrens } else { 324643466aaeSMax Grossman if (BP_IS_HOLE(bp)) { 324743466aaeSMax Grossman fill = 0; 324843466aaeSMax Grossman } else { 324943466aaeSMax Grossman fill = 1; 325043466aaeSMax Grossman } 3251fa9e4066Sahrens } 3252fa9e4066Sahrens } else { 3253e14bb325SJeff Bonwick blkptr_t *ibp = db->db.db_data; 3254fa9e4066Sahrens ASSERT3U(db->db.db_size, ==, 1<<dn->dn_phys->dn_indblkshift); 3255e14bb325SJeff Bonwick for (i = db->db.db_size >> SPA_BLKPTRSHIFT; i > 0; i--, ibp++) { 3256e14bb325SJeff Bonwick if (BP_IS_HOLE(ibp)) 3257fa9e4066Sahrens continue; 32585d7b4d43SMatthew Ahrens fill += BP_GET_FILL(ibp); 3259fa9e4066Sahrens } 3260fa9e4066Sahrens } 3261744947dcSTom Erickson DB_DNODE_EXIT(db); 3262fa9e4066Sahrens 32635d7b4d43SMatthew Ahrens if (!BP_IS_EMBEDDED(bp)) 32645d7b4d43SMatthew Ahrens bp->blk_fill = fill; 3265c717a561Smaybee 3266c717a561Smaybee mutex_exit(&db->db_mtx); 326711ceac77SAlex Reece 326811ceac77SAlex Reece rw_enter(&dn->dn_struct_rwlock, RW_WRITER); 326911ceac77SAlex Reece *db->db_blkptr = *bp; 327011ceac77SAlex Reece rw_exit(&dn->dn_struct_rwlock); 3271c717a561Smaybee } 3272fa9e4066Sahrens 32738df0bcf0SPaul Dagnelie /* ARGSUSED */ 32748df0bcf0SPaul Dagnelie /* 32758df0bcf0SPaul Dagnelie * This function gets called just prior to running through the compression 32768df0bcf0SPaul Dagnelie * stage of the zio pipeline. If we're an indirect block comprised of only 32778df0bcf0SPaul Dagnelie * holes, then we want this indirect to be compressed away to a hole. In 32788df0bcf0SPaul Dagnelie * order to do that we must zero out any information about the holes that 32798df0bcf0SPaul Dagnelie * this indirect points to prior to before we try to compress it. 32808df0bcf0SPaul Dagnelie */ 32818df0bcf0SPaul Dagnelie static void 32828df0bcf0SPaul Dagnelie dbuf_write_children_ready(zio_t *zio, arc_buf_t *buf, void *vdb) 32838df0bcf0SPaul Dagnelie { 32848df0bcf0SPaul Dagnelie dmu_buf_impl_t *db = vdb; 32858df0bcf0SPaul Dagnelie dnode_t *dn; 32868df0bcf0SPaul Dagnelie blkptr_t *bp; 32878df0bcf0SPaul Dagnelie uint64_t i; 32888df0bcf0SPaul Dagnelie int epbs; 32898df0bcf0SPaul Dagnelie 32908df0bcf0SPaul Dagnelie ASSERT3U(db->db_level, >, 0); 32918df0bcf0SPaul Dagnelie DB_DNODE_ENTER(db); 32928df0bcf0SPaul Dagnelie dn = DB_DNODE(db); 32938df0bcf0SPaul Dagnelie epbs = dn->dn_phys->dn_indblkshift - SPA_BLKPTRSHIFT; 32948df0bcf0SPaul Dagnelie 32958df0bcf0SPaul Dagnelie /* Determine if all our children are holes */ 32968df0bcf0SPaul Dagnelie for (i = 0, bp = db->db.db_data; i < 1 << epbs; i++, bp++) { 32978df0bcf0SPaul Dagnelie if (!BP_IS_HOLE(bp)) 32988df0bcf0SPaul Dagnelie break; 32998df0bcf0SPaul Dagnelie } 33008df0bcf0SPaul Dagnelie 33018df0bcf0SPaul Dagnelie /* 33028df0bcf0SPaul Dagnelie * If all the children are holes, then zero them all out so that 33038df0bcf0SPaul Dagnelie * we may get compressed away. 33048df0bcf0SPaul Dagnelie */ 33058df0bcf0SPaul Dagnelie if (i == 1 << epbs) { 33068df0bcf0SPaul Dagnelie /* didn't find any non-holes */ 33078df0bcf0SPaul Dagnelie bzero(db->db.db_data, db->db.db_size); 33088df0bcf0SPaul Dagnelie } 33098df0bcf0SPaul Dagnelie DB_DNODE_EXIT(db); 33108df0bcf0SPaul Dagnelie } 33118df0bcf0SPaul Dagnelie 331269962b56SMatthew Ahrens /* 331369962b56SMatthew Ahrens * The SPA will call this callback several times for each zio - once 331469962b56SMatthew Ahrens * for every physical child i/o (zio->io_phys_children times). This 331569962b56SMatthew Ahrens * allows the DMU to monitor the progress of each logical i/o. For example, 331669962b56SMatthew Ahrens * there may be 2 copies of an indirect block, or many fragments of a RAID-Z 331769962b56SMatthew Ahrens * block. There may be a long delay before all copies/fragments are completed, 331869962b56SMatthew Ahrens * so this callback allows us to retire dirty space gradually, as the physical 331969962b56SMatthew Ahrens * i/os complete. 332069962b56SMatthew Ahrens */ 332169962b56SMatthew Ahrens /* ARGSUSED */ 332269962b56SMatthew Ahrens static void 332369962b56SMatthew Ahrens dbuf_write_physdone(zio_t *zio, arc_buf_t *buf, void *arg) 332469962b56SMatthew Ahrens { 332569962b56SMatthew Ahrens dmu_buf_impl_t *db = arg; 332669962b56SMatthew Ahrens objset_t *os = db->db_objset; 332769962b56SMatthew Ahrens dsl_pool_t *dp = dmu_objset_pool(os); 332869962b56SMatthew Ahrens dbuf_dirty_record_t *dr; 332969962b56SMatthew Ahrens int delta = 0; 333069962b56SMatthew Ahrens 333169962b56SMatthew Ahrens dr = db->db_data_pending; 333269962b56SMatthew Ahrens ASSERT3U(dr->dr_txg, ==, zio->io_txg); 333369962b56SMatthew Ahrens 333469962b56SMatthew Ahrens /* 333569962b56SMatthew Ahrens * The callback will be called io_phys_children times. Retire one 333669962b56SMatthew Ahrens * portion of our dirty space each time we are called. Any rounding 333769962b56SMatthew Ahrens * error will be cleaned up by dsl_pool_sync()'s call to 333869962b56SMatthew Ahrens * dsl_pool_undirty_space(). 333969962b56SMatthew Ahrens */ 334069962b56SMatthew Ahrens delta = dr->dr_accounted / zio->io_phys_children; 334169962b56SMatthew Ahrens dsl_pool_undirty_space(dp, delta, zio->io_txg); 334269962b56SMatthew Ahrens } 334369962b56SMatthew Ahrens 3344c717a561Smaybee /* ARGSUSED */ 3345c717a561Smaybee static void 3346c717a561Smaybee dbuf_write_done(zio_t *zio, arc_buf_t *buf, void *vdb) 3347c717a561Smaybee { 3348c717a561Smaybee dmu_buf_impl_t *db = vdb; 3349b24ab676SJeff Bonwick blkptr_t *bp_orig = &zio->io_bp_orig; 335043466aaeSMax Grossman blkptr_t *bp = db->db_blkptr; 335143466aaeSMax Grossman objset_t *os = db->db_objset; 335243466aaeSMax Grossman dmu_tx_t *tx = os->os_synctx; 3353c717a561Smaybee dbuf_dirty_record_t **drp, *dr; 3354c717a561Smaybee 3355fb09f5aaSMadhav Suresh ASSERT0(zio->io_error); 3356b24ab676SJeff Bonwick ASSERT(db->db_blkptr == bp); 3357b24ab676SJeff Bonwick 335880901aeaSGeorge Wilson /* 335980901aeaSGeorge Wilson * For nopwrites and rewrites we ensure that the bp matches our 336080901aeaSGeorge Wilson * original and bypass all the accounting. 336180901aeaSGeorge Wilson */ 336280901aeaSGeorge Wilson if (zio->io_flags & (ZIO_FLAG_IO_REWRITE | ZIO_FLAG_NOPWRITE)) { 3363b24ab676SJeff Bonwick ASSERT(BP_EQUAL(bp, bp_orig)); 3364b24ab676SJeff Bonwick } else { 336543466aaeSMax Grossman dsl_dataset_t *ds = os->os_dsl_dataset; 3366b24ab676SJeff Bonwick (void) dsl_dataset_block_kill(ds, bp_orig, tx, B_TRUE); 3367b24ab676SJeff Bonwick dsl_dataset_block_born(ds, bp, tx); 3368b24ab676SJeff Bonwick } 3369c717a561Smaybee 3370c717a561Smaybee mutex_enter(&db->db_mtx); 3371c717a561Smaybee 3372b24ab676SJeff Bonwick DBUF_VERIFY(db); 3373b24ab676SJeff Bonwick 3374c717a561Smaybee drp = &db->db_last_dirty; 337517f17c2dSbonwick while ((dr = *drp) != db->db_data_pending) 337617f17c2dSbonwick drp = &dr->dr_next; 337717f17c2dSbonwick ASSERT(!list_link_active(&dr->dr_dirty_node)); 3378b24ab676SJeff Bonwick ASSERT(dr->dr_dbuf == db); 337917f17c2dSbonwick ASSERT(dr->dr_next == NULL); 338017f17c2dSbonwick *drp = dr->dr_next; 3381c717a561Smaybee 33820a586ceaSMark Shellenbaum #ifdef ZFS_DEBUG 33830a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) { 3384744947dcSTom Erickson dnode_t *dn; 3385744947dcSTom Erickson 3386744947dcSTom Erickson DB_DNODE_ENTER(db); 3387744947dcSTom Erickson dn = DB_DNODE(db); 33880a586ceaSMark Shellenbaum ASSERT(dn->dn_phys->dn_flags & DNODE_FLAG_SPILL_BLKPTR); 33890a586ceaSMark Shellenbaum ASSERT(!(BP_IS_HOLE(db->db_blkptr)) && 33900a586ceaSMark Shellenbaum db->db_blkptr == &dn->dn_phys->dn_spill); 3391744947dcSTom Erickson DB_DNODE_EXIT(db); 33920a586ceaSMark Shellenbaum } 33930a586ceaSMark Shellenbaum #endif 33940a586ceaSMark Shellenbaum 3395c717a561Smaybee if (db->db_level == 0) { 33960a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 3397c717a561Smaybee ASSERT(dr->dt.dl.dr_override_state == DR_NOT_OVERRIDDEN); 339882c9918fSTim Haley if (db->db_state != DB_NOFILL) { 339982c9918fSTim Haley if (dr->dt.dl.dr_data != db->db_buf) 3400dcbf3bd6SGeorge Wilson arc_buf_destroy(dr->dt.dl.dr_data, db); 340182c9918fSTim Haley } 3402c717a561Smaybee } else { 3403744947dcSTom Erickson dnode_t *dn; 3404744947dcSTom Erickson 3405744947dcSTom Erickson DB_DNODE_ENTER(db); 3406744947dcSTom Erickson dn = DB_DNODE(db); 3407c717a561Smaybee ASSERT(list_head(&dr->dt.di.dr_children) == NULL); 340843466aaeSMax Grossman ASSERT3U(db->db.db_size, ==, 1 << dn->dn_phys->dn_indblkshift); 3409c717a561Smaybee if (!BP_IS_HOLE(db->db_blkptr)) { 3410c717a561Smaybee int epbs = 3411c717a561Smaybee dn->dn_phys->dn_indblkshift - SPA_BLKPTRSHIFT; 341243466aaeSMax Grossman ASSERT3U(db->db_blkid, <=, 341343466aaeSMax Grossman dn->dn_phys->dn_maxblkid >> (db->db_level * epbs)); 3414c717a561Smaybee ASSERT3U(BP_GET_LSIZE(db->db_blkptr), ==, 3415c717a561Smaybee db->db.db_size); 3416c717a561Smaybee } 3417744947dcSTom Erickson DB_DNODE_EXIT(db); 3418c25056deSgw mutex_destroy(&dr->dt.di.dr_mtx); 3419c25056deSgw list_destroy(&dr->dt.di.dr_children); 3420c717a561Smaybee } 3421c717a561Smaybee kmem_free(dr, sizeof (dbuf_dirty_record_t)); 3422fa9e4066Sahrens 3423fa9e4066Sahrens cv_broadcast(&db->db_changed); 3424fa9e4066Sahrens ASSERT(db->db_dirtycnt > 0); 3425fa9e4066Sahrens db->db_dirtycnt -= 1; 3426c717a561Smaybee db->db_data_pending = NULL; 342743466aaeSMax Grossman dbuf_rele_and_unlock(db, (void *)(uintptr_t)tx->tx_txg); 3428b24ab676SJeff Bonwick } 3429b24ab676SJeff Bonwick 3430b24ab676SJeff Bonwick static void 3431b24ab676SJeff Bonwick dbuf_write_nofill_ready(zio_t *zio) 3432b24ab676SJeff Bonwick { 3433b24ab676SJeff Bonwick dbuf_write_ready(zio, NULL, zio->io_private); 3434b24ab676SJeff Bonwick } 3435b24ab676SJeff Bonwick 3436b24ab676SJeff Bonwick static void 3437b24ab676SJeff Bonwick dbuf_write_nofill_done(zio_t *zio) 3438b24ab676SJeff Bonwick { 3439b24ab676SJeff Bonwick dbuf_write_done(zio, NULL, zio->io_private); 3440b24ab676SJeff Bonwick } 3441b24ab676SJeff Bonwick 3442b24ab676SJeff Bonwick static void 3443b24ab676SJeff Bonwick dbuf_write_override_ready(zio_t *zio) 3444b24ab676SJeff Bonwick { 3445b24ab676SJeff Bonwick dbuf_dirty_record_t *dr = zio->io_private; 3446b24ab676SJeff Bonwick dmu_buf_impl_t *db = dr->dr_dbuf; 3447b24ab676SJeff Bonwick 3448b24ab676SJeff Bonwick dbuf_write_ready(zio, NULL, db); 3449b24ab676SJeff Bonwick } 3450b24ab676SJeff Bonwick 3451b24ab676SJeff Bonwick static void 3452b24ab676SJeff Bonwick dbuf_write_override_done(zio_t *zio) 3453b24ab676SJeff Bonwick { 3454b24ab676SJeff Bonwick dbuf_dirty_record_t *dr = zio->io_private; 3455b24ab676SJeff Bonwick dmu_buf_impl_t *db = dr->dr_dbuf; 3456b24ab676SJeff Bonwick blkptr_t *obp = &dr->dt.dl.dr_overridden_by; 3457b24ab676SJeff Bonwick 3458b24ab676SJeff Bonwick mutex_enter(&db->db_mtx); 3459b24ab676SJeff Bonwick if (!BP_EQUAL(zio->io_bp, obp)) { 3460b24ab676SJeff Bonwick if (!BP_IS_HOLE(obp)) 3461b24ab676SJeff Bonwick dsl_free(spa_get_dsl(zio->io_spa), zio->io_txg, obp); 3462b24ab676SJeff Bonwick arc_release(dr->dt.dl.dr_data, db); 3463b24ab676SJeff Bonwick } 3464fa9e4066Sahrens mutex_exit(&db->db_mtx); 3465fa9e4066Sahrens 3466b24ab676SJeff Bonwick dbuf_write_done(zio, NULL, db); 3467b24ab676SJeff Bonwick } 3468b24ab676SJeff Bonwick 34693e30c24aSWill Andrews /* Issue I/O to commit a dirty buffer to disk. */ 3470b24ab676SJeff Bonwick static void 3471b24ab676SJeff Bonwick dbuf_write(dbuf_dirty_record_t *dr, arc_buf_t *data, dmu_tx_t *tx) 3472b24ab676SJeff Bonwick { 3473b24ab676SJeff Bonwick dmu_buf_impl_t *db = dr->dr_dbuf; 3474744947dcSTom Erickson dnode_t *dn; 3475744947dcSTom Erickson objset_t *os; 3476b24ab676SJeff Bonwick dmu_buf_impl_t *parent = db->db_parent; 3477b24ab676SJeff Bonwick uint64_t txg = tx->tx_txg; 34787802d7bfSMatthew Ahrens zbookmark_phys_t zb; 3479b24ab676SJeff Bonwick zio_prop_t zp; 3480b24ab676SJeff Bonwick zio_t *zio; 34810a586ceaSMark Shellenbaum int wp_flag = 0; 3482b24ab676SJeff Bonwick 348311ceac77SAlex Reece ASSERT(dmu_tx_is_syncing(tx)); 348411ceac77SAlex Reece 3485744947dcSTom Erickson DB_DNODE_ENTER(db); 3486744947dcSTom Erickson dn = DB_DNODE(db); 3487744947dcSTom Erickson os = dn->dn_objset; 3488744947dcSTom Erickson 3489b24ab676SJeff Bonwick if (db->db_state != DB_NOFILL) { 3490b24ab676SJeff Bonwick if (db->db_level > 0 || dn->dn_type == DMU_OT_DNODE) { 3491b24ab676SJeff Bonwick /* 3492b24ab676SJeff Bonwick * Private object buffers are released here rather 3493b24ab676SJeff Bonwick * than in dbuf_dirty() since they are only modified 3494b24ab676SJeff Bonwick * in the syncing context and we don't want the 3495b24ab676SJeff Bonwick * overhead of making multiple copies of the data. 3496b24ab676SJeff Bonwick */ 3497b24ab676SJeff Bonwick if (BP_IS_HOLE(db->db_blkptr)) { 3498b24ab676SJeff Bonwick arc_buf_thaw(data); 3499b24ab676SJeff Bonwick } else { 35003f9d6ad7SLin Ling dbuf_release_bp(db); 3501b24ab676SJeff Bonwick } 3502b24ab676SJeff Bonwick } 3503b24ab676SJeff Bonwick } 3504b24ab676SJeff Bonwick 3505b24ab676SJeff Bonwick if (parent != dn->dn_dbuf) { 35063e30c24aSWill Andrews /* Our parent is an indirect block. */ 35073e30c24aSWill Andrews /* We have a dirty parent that has been scheduled for write. */ 3508b24ab676SJeff Bonwick ASSERT(parent && parent->db_data_pending); 35093e30c24aSWill Andrews /* Our parent's buffer is one level closer to the dnode. */ 3510b24ab676SJeff Bonwick ASSERT(db->db_level == parent->db_level-1); 35113e30c24aSWill Andrews /* 35123e30c24aSWill Andrews * We're about to modify our parent's db_data by modifying 35133e30c24aSWill Andrews * our block pointer, so the parent must be released. 35143e30c24aSWill Andrews */ 3515b24ab676SJeff Bonwick ASSERT(arc_released(parent->db_buf)); 3516b24ab676SJeff Bonwick zio = parent->db_data_pending->dr_zio; 3517b24ab676SJeff Bonwick } else { 35183e30c24aSWill Andrews /* Our parent is the dnode itself. */ 35190a586ceaSMark Shellenbaum ASSERT((db->db_level == dn->dn_phys->dn_nlevels-1 && 35200a586ceaSMark Shellenbaum db->db_blkid != DMU_SPILL_BLKID) || 35210a586ceaSMark Shellenbaum (db->db_blkid == DMU_SPILL_BLKID && db->db_level == 0)); 35220a586ceaSMark Shellenbaum if (db->db_blkid != DMU_SPILL_BLKID) 35230a586ceaSMark Shellenbaum ASSERT3P(db->db_blkptr, ==, 35240a586ceaSMark Shellenbaum &dn->dn_phys->dn_blkptr[db->db_blkid]); 3525b24ab676SJeff Bonwick zio = dn->dn_zio; 3526b24ab676SJeff Bonwick } 3527b24ab676SJeff Bonwick 3528b24ab676SJeff Bonwick ASSERT(db->db_level == 0 || data == db->db_buf); 3529b24ab676SJeff Bonwick ASSERT3U(db->db_blkptr->blk_birth, <=, txg); 3530b24ab676SJeff Bonwick ASSERT(zio); 3531fa9e4066Sahrens 3532b24ab676SJeff Bonwick SET_BOOKMARK(&zb, os->os_dsl_dataset ? 3533b24ab676SJeff Bonwick os->os_dsl_dataset->ds_object : DMU_META_OBJSET, 3534b24ab676SJeff Bonwick db->db.db_object, db->db_level, db->db_blkid); 3535b24ab676SJeff Bonwick 35360a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) 35370a586ceaSMark Shellenbaum wp_flag = WP_SPILL; 35380a586ceaSMark Shellenbaum wp_flag |= (db->db_state == DB_NOFILL) ? WP_NOFILL : 0; 35390a586ceaSMark Shellenbaum 35400a586ceaSMark Shellenbaum dmu_write_policy(os, dn, db->db_level, wp_flag, &zp); 3541744947dcSTom Erickson DB_DNODE_EXIT(db); 3542b24ab676SJeff Bonwick 354311ceac77SAlex Reece /* 354411ceac77SAlex Reece * We copy the blkptr now (rather than when we instantiate the dirty 354511ceac77SAlex Reece * record), because its value can change between open context and 354611ceac77SAlex Reece * syncing context. We do not need to hold dn_struct_rwlock to read 354711ceac77SAlex Reece * db_blkptr because we are in syncing context. 354811ceac77SAlex Reece */ 354911ceac77SAlex Reece dr->dr_bp_copy = *db->db_blkptr; 355011ceac77SAlex Reece 35515d7b4d43SMatthew Ahrens if (db->db_level == 0 && 35525d7b4d43SMatthew Ahrens dr->dt.dl.dr_override_state == DR_OVERRIDDEN) { 35535d7b4d43SMatthew Ahrens /* 35545d7b4d43SMatthew Ahrens * The BP for this block has been provided by open context 35555d7b4d43SMatthew Ahrens * (by dmu_sync() or dmu_buf_write_embedded()). 35565d7b4d43SMatthew Ahrens */ 35575d7b4d43SMatthew Ahrens void *contents = (data != NULL) ? data->b_data : NULL; 35585d7b4d43SMatthew Ahrens 3559b24ab676SJeff Bonwick dr->dr_zio = zio_write(zio, os->os_spa, txg, 356011ceac77SAlex Reece &dr->dr_bp_copy, contents, db->db.db_size, &zp, 35618df0bcf0SPaul Dagnelie dbuf_write_override_ready, NULL, NULL, 35628df0bcf0SPaul Dagnelie dbuf_write_override_done, 356369962b56SMatthew Ahrens dr, ZIO_PRIORITY_ASYNC_WRITE, ZIO_FLAG_MUSTSUCCEED, &zb); 3564b24ab676SJeff Bonwick mutex_enter(&db->db_mtx); 3565b24ab676SJeff Bonwick dr->dt.dl.dr_override_state = DR_NOT_OVERRIDDEN; 3566b24ab676SJeff Bonwick zio_write_override(dr->dr_zio, &dr->dt.dl.dr_overridden_by, 356780901aeaSGeorge Wilson dr->dt.dl.dr_copies, dr->dt.dl.dr_nopwrite); 3568b24ab676SJeff Bonwick mutex_exit(&db->db_mtx); 3569b24ab676SJeff Bonwick } else if (db->db_state == DB_NOFILL) { 3570810e43b2SBill Pijewski ASSERT(zp.zp_checksum == ZIO_CHECKSUM_OFF || 3571810e43b2SBill Pijewski zp.zp_checksum == ZIO_CHECKSUM_NOPARITY); 3572b24ab676SJeff Bonwick dr->dr_zio = zio_write(zio, os->os_spa, txg, 357311ceac77SAlex Reece &dr->dr_bp_copy, NULL, db->db.db_size, &zp, 35748df0bcf0SPaul Dagnelie dbuf_write_nofill_ready, NULL, NULL, 35758df0bcf0SPaul Dagnelie dbuf_write_nofill_done, db, 3576b24ab676SJeff Bonwick ZIO_PRIORITY_ASYNC_WRITE, 3577b24ab676SJeff Bonwick ZIO_FLAG_MUSTSUCCEED | ZIO_FLAG_NODATA, &zb); 3578b24ab676SJeff Bonwick } else { 3579b24ab676SJeff Bonwick ASSERT(arc_released(data)); 35808df0bcf0SPaul Dagnelie 35818df0bcf0SPaul Dagnelie /* 35828df0bcf0SPaul Dagnelie * For indirect blocks, we want to setup the children 35838df0bcf0SPaul Dagnelie * ready callback so that we can properly handle an indirect 35848df0bcf0SPaul Dagnelie * block that only contains holes. 35858df0bcf0SPaul Dagnelie */ 35868df0bcf0SPaul Dagnelie arc_done_func_t *children_ready_cb = NULL; 35878df0bcf0SPaul Dagnelie if (db->db_level != 0) 35888df0bcf0SPaul Dagnelie children_ready_cb = dbuf_write_children_ready; 35898df0bcf0SPaul Dagnelie 3590b24ab676SJeff Bonwick dr->dr_zio = arc_write(zio, os->os_spa, txg, 359111ceac77SAlex Reece &dr->dr_bp_copy, data, DBUF_IS_L2CACHEABLE(db), 3592dcbf3bd6SGeorge Wilson &zp, dbuf_write_ready, children_ready_cb, 359369962b56SMatthew Ahrens dbuf_write_physdone, dbuf_write_done, db, 359469962b56SMatthew Ahrens ZIO_PRIORITY_ASYNC_WRITE, ZIO_FLAG_MUSTSUCCEED, &zb); 3595b24ab676SJeff Bonwick } 3596fa9e4066Sahrens } 3597