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. 2446e1baa6SMatthew Ahrens * Copyright (c) 2012, 2015 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. 28fa9e4066Sahrens */ 29fa9e4066Sahrens 30fa9e4066Sahrens #include <sys/zfs_context.h> 31fa9e4066Sahrens #include <sys/dmu.h> 322f3d8780SMatthew Ahrens #include <sys/dmu_send.h> 33fa9e4066Sahrens #include <sys/dmu_impl.h> 34fa9e4066Sahrens #include <sys/dbuf.h> 35fa9e4066Sahrens #include <sys/dmu_objset.h> 36fa9e4066Sahrens #include <sys/dsl_dataset.h> 37fa9e4066Sahrens #include <sys/dsl_dir.h> 38fa9e4066Sahrens #include <sys/dmu_tx.h> 39fa9e4066Sahrens #include <sys/spa.h> 40fa9e4066Sahrens #include <sys/zio.h> 41fa9e4066Sahrens #include <sys/dmu_zfetch.h> 420a586ceaSMark Shellenbaum #include <sys/sa.h> 430a586ceaSMark Shellenbaum #include <sys/sa_impl.h> 445d7b4d43SMatthew Ahrens #include <sys/zfeature.h> 455d7b4d43SMatthew Ahrens #include <sys/blkptr.h> 46bf16b11eSMatthew Ahrens #include <sys/range_tree.h> 47fa9e4066Sahrens 48713d6c20SMatthew Ahrens /* 49713d6c20SMatthew Ahrens * Number of times that zfs_free_range() took the slow path while doing 50713d6c20SMatthew Ahrens * a zfs receive. A nonzero value indicates a potential performance problem. 51713d6c20SMatthew Ahrens */ 52713d6c20SMatthew Ahrens uint64_t zfs_free_range_recv_miss; 53713d6c20SMatthew Ahrens 54fa9e4066Sahrens static void dbuf_destroy(dmu_buf_impl_t *db); 553b2aab18SMatthew Ahrens static boolean_t dbuf_undirty(dmu_buf_impl_t *db, dmu_tx_t *tx); 56088f3894Sahrens static void dbuf_write(dbuf_dirty_record_t *dr, arc_buf_t *data, dmu_tx_t *tx); 57fa9e4066Sahrens 58bc9014e6SJustin Gibbs #ifndef __lint 59bc9014e6SJustin Gibbs extern inline void dmu_buf_init_user(dmu_buf_user_t *dbu, 60bc9014e6SJustin Gibbs dmu_buf_evict_func_t *evict_func, dmu_buf_t **clear_on_evict_dbufp); 61bc9014e6SJustin Gibbs #endif /* ! __lint */ 62bc9014e6SJustin Gibbs 63fa9e4066Sahrens /* 64fa9e4066Sahrens * Global data structures and functions for the dbuf cache. 65fa9e4066Sahrens */ 66fa9e4066Sahrens static kmem_cache_t *dbuf_cache; 67bc9014e6SJustin Gibbs static taskq_t *dbu_evict_taskq; 68fa9e4066Sahrens 69fa9e4066Sahrens /* ARGSUSED */ 70fa9e4066Sahrens static int 71fa9e4066Sahrens dbuf_cons(void *vdb, void *unused, int kmflag) 72fa9e4066Sahrens { 73fa9e4066Sahrens dmu_buf_impl_t *db = vdb; 74fa9e4066Sahrens bzero(db, sizeof (dmu_buf_impl_t)); 75fa9e4066Sahrens 76fa9e4066Sahrens mutex_init(&db->db_mtx, NULL, MUTEX_DEFAULT, NULL); 77fa9e4066Sahrens cv_init(&db->db_changed, NULL, CV_DEFAULT, NULL); 78fa9e4066Sahrens refcount_create(&db->db_holds); 790f6d88adSAlex Reece 80fa9e4066Sahrens return (0); 81fa9e4066Sahrens } 82fa9e4066Sahrens 83fa9e4066Sahrens /* ARGSUSED */ 84fa9e4066Sahrens static void 85fa9e4066Sahrens dbuf_dest(void *vdb, void *unused) 86fa9e4066Sahrens { 87fa9e4066Sahrens dmu_buf_impl_t *db = vdb; 88fa9e4066Sahrens mutex_destroy(&db->db_mtx); 89fa9e4066Sahrens cv_destroy(&db->db_changed); 90fa9e4066Sahrens refcount_destroy(&db->db_holds); 91fa9e4066Sahrens } 92fa9e4066Sahrens 93fa9e4066Sahrens /* 94fa9e4066Sahrens * dbuf hash table routines 95fa9e4066Sahrens */ 96fa9e4066Sahrens static dbuf_hash_table_t dbuf_hash_table; 97fa9e4066Sahrens 98fa9e4066Sahrens static uint64_t dbuf_hash_count; 99fa9e4066Sahrens 100fa9e4066Sahrens static uint64_t 101fa9e4066Sahrens dbuf_hash(void *os, uint64_t obj, uint8_t lvl, uint64_t blkid) 102fa9e4066Sahrens { 103fa9e4066Sahrens uintptr_t osv = (uintptr_t)os; 104fa9e4066Sahrens uint64_t crc = -1ULL; 105fa9e4066Sahrens 106fa9e4066Sahrens ASSERT(zfs_crc64_table[128] == ZFS_CRC64_POLY); 107fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (lvl)) & 0xFF]; 108fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (osv >> 6)) & 0xFF]; 109fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (obj >> 0)) & 0xFF]; 110fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (obj >> 8)) & 0xFF]; 111fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (blkid >> 0)) & 0xFF]; 112fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (blkid >> 8)) & 0xFF]; 113fa9e4066Sahrens 114fa9e4066Sahrens crc ^= (osv>>14) ^ (obj>>16) ^ (blkid>>16); 115fa9e4066Sahrens 116fa9e4066Sahrens return (crc); 117fa9e4066Sahrens } 118fa9e4066Sahrens 119fa9e4066Sahrens #define DBUF_HASH(os, obj, level, blkid) dbuf_hash(os, obj, level, blkid); 120fa9e4066Sahrens 121fa9e4066Sahrens #define DBUF_EQUAL(dbuf, os, obj, level, blkid) \ 122fa9e4066Sahrens ((dbuf)->db.db_object == (obj) && \ 123fa9e4066Sahrens (dbuf)->db_objset == (os) && \ 124fa9e4066Sahrens (dbuf)->db_level == (level) && \ 125fa9e4066Sahrens (dbuf)->db_blkid == (blkid)) 126fa9e4066Sahrens 127fa9e4066Sahrens dmu_buf_impl_t * 128e57a022bSJustin T. Gibbs dbuf_find(objset_t *os, uint64_t obj, uint8_t level, uint64_t blkid) 129fa9e4066Sahrens { 130fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 131fa9e4066Sahrens uint64_t hv = DBUF_HASH(os, obj, level, blkid); 132fa9e4066Sahrens uint64_t idx = hv & h->hash_table_mask; 133fa9e4066Sahrens dmu_buf_impl_t *db; 134fa9e4066Sahrens 135fa9e4066Sahrens mutex_enter(DBUF_HASH_MUTEX(h, idx)); 136fa9e4066Sahrens for (db = h->hash_table[idx]; db != NULL; db = db->db_hash_next) { 137fa9e4066Sahrens if (DBUF_EQUAL(db, os, obj, level, blkid)) { 138fa9e4066Sahrens mutex_enter(&db->db_mtx); 139ea8dc4b6Seschrock if (db->db_state != DB_EVICTING) { 140fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 141fa9e4066Sahrens return (db); 142fa9e4066Sahrens } 143fa9e4066Sahrens mutex_exit(&db->db_mtx); 144fa9e4066Sahrens } 145fa9e4066Sahrens } 146fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 147fa9e4066Sahrens return (NULL); 148fa9e4066Sahrens } 149fa9e4066Sahrens 150e57a022bSJustin T. Gibbs static dmu_buf_impl_t * 151e57a022bSJustin T. Gibbs dbuf_find_bonus(objset_t *os, uint64_t object) 152e57a022bSJustin T. Gibbs { 153e57a022bSJustin T. Gibbs dnode_t *dn; 154e57a022bSJustin T. Gibbs dmu_buf_impl_t *db = NULL; 155e57a022bSJustin T. Gibbs 156e57a022bSJustin T. Gibbs if (dnode_hold(os, object, FTAG, &dn) == 0) { 157e57a022bSJustin T. Gibbs rw_enter(&dn->dn_struct_rwlock, RW_READER); 158e57a022bSJustin T. Gibbs if (dn->dn_bonus != NULL) { 159e57a022bSJustin T. Gibbs db = dn->dn_bonus; 160e57a022bSJustin T. Gibbs mutex_enter(&db->db_mtx); 161e57a022bSJustin T. Gibbs } 162e57a022bSJustin T. Gibbs rw_exit(&dn->dn_struct_rwlock); 163e57a022bSJustin T. Gibbs dnode_rele(dn, FTAG); 164e57a022bSJustin T. Gibbs } 165e57a022bSJustin T. Gibbs return (db); 166e57a022bSJustin T. Gibbs } 167e57a022bSJustin T. Gibbs 168fa9e4066Sahrens /* 169fa9e4066Sahrens * Insert an entry into the hash table. If there is already an element 170fa9e4066Sahrens * equal to elem in the hash table, then the already existing element 171fa9e4066Sahrens * will be returned and the new element will not be inserted. 172fa9e4066Sahrens * Otherwise returns NULL. 173fa9e4066Sahrens */ 174fa9e4066Sahrens static dmu_buf_impl_t * 175fa9e4066Sahrens dbuf_hash_insert(dmu_buf_impl_t *db) 176fa9e4066Sahrens { 177fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 178503ad85cSMatthew Ahrens objset_t *os = db->db_objset; 179fa9e4066Sahrens uint64_t obj = db->db.db_object; 180fa9e4066Sahrens int level = db->db_level; 181fa9e4066Sahrens uint64_t blkid = db->db_blkid; 182fa9e4066Sahrens uint64_t hv = DBUF_HASH(os, obj, level, blkid); 183fa9e4066Sahrens uint64_t idx = hv & h->hash_table_mask; 184fa9e4066Sahrens dmu_buf_impl_t *dbf; 185fa9e4066Sahrens 186fa9e4066Sahrens mutex_enter(DBUF_HASH_MUTEX(h, idx)); 187fa9e4066Sahrens for (dbf = h->hash_table[idx]; dbf != NULL; dbf = dbf->db_hash_next) { 188fa9e4066Sahrens if (DBUF_EQUAL(dbf, os, obj, level, blkid)) { 189fa9e4066Sahrens mutex_enter(&dbf->db_mtx); 190ea8dc4b6Seschrock if (dbf->db_state != DB_EVICTING) { 191fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 192fa9e4066Sahrens return (dbf); 193fa9e4066Sahrens } 194fa9e4066Sahrens mutex_exit(&dbf->db_mtx); 195fa9e4066Sahrens } 196fa9e4066Sahrens } 197fa9e4066Sahrens 198fa9e4066Sahrens mutex_enter(&db->db_mtx); 199fa9e4066Sahrens db->db_hash_next = h->hash_table[idx]; 200fa9e4066Sahrens h->hash_table[idx] = db; 201fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 2021a5e258fSJosef 'Jeff' Sipek atomic_inc_64(&dbuf_hash_count); 203fa9e4066Sahrens 204fa9e4066Sahrens return (NULL); 205fa9e4066Sahrens } 206fa9e4066Sahrens 207fa9e4066Sahrens /* 208bbfa8ea8SMatthew Ahrens * Remove an entry from the hash table. It must be in the EVICTING state. 209fa9e4066Sahrens */ 210fa9e4066Sahrens static void 211fa9e4066Sahrens dbuf_hash_remove(dmu_buf_impl_t *db) 212fa9e4066Sahrens { 213fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 214fa9e4066Sahrens uint64_t hv = DBUF_HASH(db->db_objset, db->db.db_object, 215fa9e4066Sahrens db->db_level, db->db_blkid); 216fa9e4066Sahrens uint64_t idx = hv & h->hash_table_mask; 217fa9e4066Sahrens dmu_buf_impl_t *dbf, **dbp; 218fa9e4066Sahrens 219fa9e4066Sahrens /* 220bbfa8ea8SMatthew Ahrens * We musn't hold db_mtx to maintain lock ordering: 221fa9e4066Sahrens * DBUF_HASH_MUTEX > db_mtx. 222fa9e4066Sahrens */ 223fa9e4066Sahrens ASSERT(refcount_is_zero(&db->db_holds)); 224ea8dc4b6Seschrock ASSERT(db->db_state == DB_EVICTING); 225fa9e4066Sahrens ASSERT(!MUTEX_HELD(&db->db_mtx)); 226fa9e4066Sahrens 227fa9e4066Sahrens mutex_enter(DBUF_HASH_MUTEX(h, idx)); 228fa9e4066Sahrens dbp = &h->hash_table[idx]; 229fa9e4066Sahrens while ((dbf = *dbp) != db) { 230fa9e4066Sahrens dbp = &dbf->db_hash_next; 231fa9e4066Sahrens ASSERT(dbf != NULL); 232fa9e4066Sahrens } 233fa9e4066Sahrens *dbp = db->db_hash_next; 234fa9e4066Sahrens db->db_hash_next = NULL; 235fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 2361a5e258fSJosef 'Jeff' Sipek atomic_dec_64(&dbuf_hash_count); 237fa9e4066Sahrens } 238fa9e4066Sahrens 239ea8dc4b6Seschrock static arc_evict_func_t dbuf_do_evict; 240fa9e4066Sahrens 241bc9014e6SJustin Gibbs typedef enum { 242bc9014e6SJustin Gibbs DBVU_EVICTING, 243bc9014e6SJustin Gibbs DBVU_NOT_EVICTING 244bc9014e6SJustin Gibbs } dbvu_verify_type_t; 245bc9014e6SJustin Gibbs 246bc9014e6SJustin Gibbs static void 247bc9014e6SJustin Gibbs dbuf_verify_user(dmu_buf_impl_t *db, dbvu_verify_type_t verify_type) 248bc9014e6SJustin Gibbs { 249bc9014e6SJustin Gibbs #ifdef ZFS_DEBUG 250bc9014e6SJustin Gibbs int64_t holds; 251bc9014e6SJustin Gibbs 252bc9014e6SJustin Gibbs if (db->db_user == NULL) 253bc9014e6SJustin Gibbs return; 254bc9014e6SJustin Gibbs 255bc9014e6SJustin Gibbs /* Only data blocks support the attachment of user data. */ 256bc9014e6SJustin Gibbs ASSERT(db->db_level == 0); 257bc9014e6SJustin Gibbs 258bc9014e6SJustin Gibbs /* Clients must resolve a dbuf before attaching user data. */ 259bc9014e6SJustin Gibbs ASSERT(db->db.db_data != NULL); 260bc9014e6SJustin Gibbs ASSERT3U(db->db_state, ==, DB_CACHED); 261bc9014e6SJustin Gibbs 262bc9014e6SJustin Gibbs holds = refcount_count(&db->db_holds); 263bc9014e6SJustin Gibbs if (verify_type == DBVU_EVICTING) { 264bc9014e6SJustin Gibbs /* 265bc9014e6SJustin Gibbs * Immediate eviction occurs when holds == dirtycnt. 266bc9014e6SJustin Gibbs * For normal eviction buffers, holds is zero on 267bc9014e6SJustin Gibbs * eviction, except when dbuf_fix_old_data() calls 268bc9014e6SJustin Gibbs * dbuf_clear_data(). However, the hold count can grow 269bc9014e6SJustin Gibbs * during eviction even though db_mtx is held (see 270bc9014e6SJustin Gibbs * dmu_bonus_hold() for an example), so we can only 271bc9014e6SJustin Gibbs * test the generic invariant that holds >= dirtycnt. 272bc9014e6SJustin Gibbs */ 273bc9014e6SJustin Gibbs ASSERT3U(holds, >=, db->db_dirtycnt); 274bc9014e6SJustin Gibbs } else { 275bc9014e6SJustin Gibbs if (db->db_immediate_evict == TRUE) 276bc9014e6SJustin Gibbs ASSERT3U(holds, >=, db->db_dirtycnt); 277bc9014e6SJustin Gibbs else 278bc9014e6SJustin Gibbs ASSERT3U(holds, >, 0); 279bc9014e6SJustin Gibbs } 280bc9014e6SJustin Gibbs #endif 281bc9014e6SJustin Gibbs } 282bc9014e6SJustin Gibbs 283fa9e4066Sahrens static void 284fa9e4066Sahrens dbuf_evict_user(dmu_buf_impl_t *db) 285fa9e4066Sahrens { 286bc9014e6SJustin Gibbs dmu_buf_user_t *dbu = db->db_user; 287bc9014e6SJustin Gibbs 288fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 289fa9e4066Sahrens 290bc9014e6SJustin Gibbs if (dbu == NULL) 291fa9e4066Sahrens return; 292fa9e4066Sahrens 293bc9014e6SJustin Gibbs dbuf_verify_user(db, DBVU_EVICTING); 294bc9014e6SJustin Gibbs db->db_user = NULL; 295bc9014e6SJustin Gibbs 296bc9014e6SJustin Gibbs #ifdef ZFS_DEBUG 297bc9014e6SJustin Gibbs if (dbu->dbu_clear_on_evict_dbufp != NULL) 298bc9014e6SJustin Gibbs *dbu->dbu_clear_on_evict_dbufp = NULL; 299bc9014e6SJustin Gibbs #endif 300bc9014e6SJustin Gibbs 301bc9014e6SJustin Gibbs /* 302bc9014e6SJustin Gibbs * Invoke the callback from a taskq to avoid lock order reversals 303bc9014e6SJustin Gibbs * and limit stack depth. 304bc9014e6SJustin Gibbs */ 305bc9014e6SJustin Gibbs taskq_dispatch_ent(dbu_evict_taskq, dbu->dbu_evict_func, dbu, 0, 306bc9014e6SJustin Gibbs &dbu->dbu_tqent); 307fa9e4066Sahrens } 308fa9e4066Sahrens 309744947dcSTom Erickson boolean_t 310744947dcSTom Erickson dbuf_is_metadata(dmu_buf_impl_t *db) 311744947dcSTom Erickson { 312744947dcSTom Erickson if (db->db_level > 0) { 313744947dcSTom Erickson return (B_TRUE); 314744947dcSTom Erickson } else { 315744947dcSTom Erickson boolean_t is_metadata; 316744947dcSTom Erickson 317744947dcSTom Erickson DB_DNODE_ENTER(db); 318ad135b5dSChristopher Siden is_metadata = DMU_OT_IS_METADATA(DB_DNODE(db)->dn_type); 319744947dcSTom Erickson DB_DNODE_EXIT(db); 320744947dcSTom Erickson 321744947dcSTom Erickson return (is_metadata); 322744947dcSTom Erickson } 323744947dcSTom Erickson } 324744947dcSTom Erickson 325fa9e4066Sahrens void 326ea8dc4b6Seschrock dbuf_evict(dmu_buf_impl_t *db) 327ea8dc4b6Seschrock { 328ea8dc4b6Seschrock ASSERT(MUTEX_HELD(&db->db_mtx)); 329ea8dc4b6Seschrock ASSERT(db->db_buf == NULL); 330c717a561Smaybee ASSERT(db->db_data_pending == NULL); 331ea8dc4b6Seschrock 332ea8dc4b6Seschrock dbuf_clear(db); 333ea8dc4b6Seschrock dbuf_destroy(db); 334ea8dc4b6Seschrock } 335ea8dc4b6Seschrock 336ea8dc4b6Seschrock void 337fa9e4066Sahrens dbuf_init(void) 338fa9e4066Sahrens { 339ea8dc4b6Seschrock uint64_t hsize = 1ULL << 16; 340fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 341fa9e4066Sahrens int i; 342fa9e4066Sahrens 343fa9e4066Sahrens /* 344fa9e4066Sahrens * The hash table is big enough to fill all of physical memory 345ea8dc4b6Seschrock * with an average 4K block size. The table will take up 346ea8dc4b6Seschrock * totalmem*sizeof(void*)/4K (i.e. 2MB/GB with 8-byte pointers). 347fa9e4066Sahrens */ 348ea8dc4b6Seschrock while (hsize * 4096 < physmem * PAGESIZE) 349fa9e4066Sahrens hsize <<= 1; 350fa9e4066Sahrens 351ea8dc4b6Seschrock retry: 352fa9e4066Sahrens h->hash_table_mask = hsize - 1; 353ea8dc4b6Seschrock h->hash_table = kmem_zalloc(hsize * sizeof (void *), KM_NOSLEEP); 354ea8dc4b6Seschrock if (h->hash_table == NULL) { 355ea8dc4b6Seschrock /* XXX - we should really return an error instead of assert */ 356ea8dc4b6Seschrock ASSERT(hsize > (1ULL << 10)); 357ea8dc4b6Seschrock hsize >>= 1; 358ea8dc4b6Seschrock goto retry; 359ea8dc4b6Seschrock } 360fa9e4066Sahrens 361fa9e4066Sahrens dbuf_cache = kmem_cache_create("dmu_buf_impl_t", 362fa9e4066Sahrens sizeof (dmu_buf_impl_t), 363fa9e4066Sahrens 0, dbuf_cons, dbuf_dest, NULL, NULL, NULL, 0); 364fa9e4066Sahrens 365fa9e4066Sahrens for (i = 0; i < DBUF_MUTEXES; i++) 366fa9e4066Sahrens mutex_init(&h->hash_mutexes[i], NULL, MUTEX_DEFAULT, NULL); 367bc9014e6SJustin Gibbs 368bc9014e6SJustin Gibbs /* 369bc9014e6SJustin Gibbs * All entries are queued via taskq_dispatch_ent(), so min/maxalloc 370bc9014e6SJustin Gibbs * configuration is not required. 371bc9014e6SJustin Gibbs */ 372bc9014e6SJustin Gibbs dbu_evict_taskq = taskq_create("dbu_evict", 1, minclsyspri, 0, 0, 0); 373fa9e4066Sahrens } 374fa9e4066Sahrens 375fa9e4066Sahrens void 376fa9e4066Sahrens dbuf_fini(void) 377fa9e4066Sahrens { 378fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 379fa9e4066Sahrens int i; 380fa9e4066Sahrens 381fa9e4066Sahrens for (i = 0; i < DBUF_MUTEXES; i++) 382fa9e4066Sahrens mutex_destroy(&h->hash_mutexes[i]); 383fa9e4066Sahrens kmem_free(h->hash_table, (h->hash_table_mask + 1) * sizeof (void *)); 384fa9e4066Sahrens kmem_cache_destroy(dbuf_cache); 385bc9014e6SJustin Gibbs taskq_destroy(dbu_evict_taskq); 386fa9e4066Sahrens } 387fa9e4066Sahrens 388fa9e4066Sahrens /* 389fa9e4066Sahrens * Other stuff. 390fa9e4066Sahrens */ 391fa9e4066Sahrens 3929c9dc39aSek110237 #ifdef ZFS_DEBUG 393fa9e4066Sahrens static void 394fa9e4066Sahrens dbuf_verify(dmu_buf_impl_t *db) 395fa9e4066Sahrens { 396744947dcSTom Erickson dnode_t *dn; 397b24ab676SJeff Bonwick dbuf_dirty_record_t *dr; 398fa9e4066Sahrens 399fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 400fa9e4066Sahrens 401fa9e4066Sahrens if (!(zfs_flags & ZFS_DEBUG_DBUF_VERIFY)) 402fa9e4066Sahrens return; 403fa9e4066Sahrens 404fa9e4066Sahrens ASSERT(db->db_objset != NULL); 405744947dcSTom Erickson DB_DNODE_ENTER(db); 406744947dcSTom Erickson dn = DB_DNODE(db); 407fa9e4066Sahrens if (dn == NULL) { 408fa9e4066Sahrens ASSERT(db->db_parent == NULL); 409fa9e4066Sahrens ASSERT(db->db_blkptr == NULL); 410fa9e4066Sahrens } else { 411fa9e4066Sahrens ASSERT3U(db->db.db_object, ==, dn->dn_object); 412fa9e4066Sahrens ASSERT3P(db->db_objset, ==, dn->dn_objset); 413fa9e4066Sahrens ASSERT3U(db->db_level, <, dn->dn_nlevels); 414744947dcSTom Erickson ASSERT(db->db_blkid == DMU_BONUS_BLKID || 415744947dcSTom Erickson db->db_blkid == DMU_SPILL_BLKID || 4160f6d88adSAlex Reece !avl_is_empty(&dn->dn_dbufs)); 417fa9e4066Sahrens } 4180a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 419fa9e4066Sahrens ASSERT(dn != NULL); 4201934e92fSmaybee ASSERT3U(db->db.db_size, >=, dn->dn_bonuslen); 4210a586ceaSMark Shellenbaum ASSERT3U(db->db.db_offset, ==, DMU_BONUS_BLKID); 4220a586ceaSMark Shellenbaum } else if (db->db_blkid == DMU_SPILL_BLKID) { 4230a586ceaSMark Shellenbaum ASSERT(dn != NULL); 4240a586ceaSMark Shellenbaum ASSERT3U(db->db.db_size, >=, dn->dn_bonuslen); 425fb09f5aaSMadhav Suresh ASSERT0(db->db.db_offset); 426fa9e4066Sahrens } else { 427fa9e4066Sahrens ASSERT3U(db->db.db_offset, ==, db->db_blkid * db->db.db_size); 428fa9e4066Sahrens } 429fa9e4066Sahrens 430b24ab676SJeff Bonwick for (dr = db->db_data_pending; dr != NULL; dr = dr->dr_next) 431b24ab676SJeff Bonwick ASSERT(dr->dr_dbuf == db); 432b24ab676SJeff Bonwick 433b24ab676SJeff Bonwick for (dr = db->db_last_dirty; dr != NULL; dr = dr->dr_next) 434b24ab676SJeff Bonwick ASSERT(dr->dr_dbuf == db); 435b24ab676SJeff Bonwick 43688b7b0f2SMatthew Ahrens /* 43788b7b0f2SMatthew Ahrens * We can't assert that db_size matches dn_datablksz because it 43888b7b0f2SMatthew Ahrens * can be momentarily different when another thread is doing 43988b7b0f2SMatthew Ahrens * dnode_set_blksz(). 44088b7b0f2SMatthew Ahrens */ 44188b7b0f2SMatthew Ahrens if (db->db_level == 0 && db->db.db_object == DMU_META_DNODE_OBJECT) { 442b24ab676SJeff Bonwick dr = db->db_data_pending; 443fa9e4066Sahrens /* 44488b7b0f2SMatthew Ahrens * It should only be modified in syncing context, so 44588b7b0f2SMatthew Ahrens * make sure we only have one copy of the data. 446fa9e4066Sahrens */ 447c717a561Smaybee ASSERT(dr == NULL || dr->dt.dl.dr_data == db->db_buf); 448fa9e4066Sahrens } 449fa9e4066Sahrens 450fa9e4066Sahrens /* verify db->db_blkptr */ 451fa9e4066Sahrens if (db->db_blkptr) { 452fa9e4066Sahrens if (db->db_parent == dn->dn_dbuf) { 453fa9e4066Sahrens /* db is pointed to by the dnode */ 454fa9e4066Sahrens /* ASSERT3U(db->db_blkid, <, dn->dn_nblkptr); */ 45514843421SMatthew Ahrens if (DMU_OBJECT_IS_SPECIAL(db->db.db_object)) 456fa9e4066Sahrens ASSERT(db->db_parent == NULL); 457fa9e4066Sahrens else 458fa9e4066Sahrens ASSERT(db->db_parent != NULL); 4590a586ceaSMark Shellenbaum if (db->db_blkid != DMU_SPILL_BLKID) 460fa9e4066Sahrens ASSERT3P(db->db_blkptr, ==, 461fa9e4066Sahrens &dn->dn_phys->dn_blkptr[db->db_blkid]); 462fa9e4066Sahrens } else { 463fa9e4066Sahrens /* db is pointed to by an indirect block */ 464fa9e4066Sahrens int epb = db->db_parent->db.db_size >> SPA_BLKPTRSHIFT; 465fa9e4066Sahrens ASSERT3U(db->db_parent->db_level, ==, db->db_level+1); 466fa9e4066Sahrens ASSERT3U(db->db_parent->db.db_object, ==, 467fa9e4066Sahrens db->db.db_object); 468fa9e4066Sahrens /* 469fa9e4066Sahrens * dnode_grow_indblksz() can make this fail if we don't 470fa9e4066Sahrens * have the struct_rwlock. XXX indblksz no longer 471fa9e4066Sahrens * grows. safe to do this now? 472fa9e4066Sahrens */ 473744947dcSTom Erickson if (RW_WRITE_HELD(&dn->dn_struct_rwlock)) { 474fa9e4066Sahrens ASSERT3P(db->db_blkptr, ==, 475fa9e4066Sahrens ((blkptr_t *)db->db_parent->db.db_data + 476fa9e4066Sahrens db->db_blkid % epb)); 477fa9e4066Sahrens } 478fa9e4066Sahrens } 479fa9e4066Sahrens } 480fa9e4066Sahrens if ((db->db_blkptr == NULL || BP_IS_HOLE(db->db_blkptr)) && 4813f9d6ad7SLin Ling (db->db_buf == NULL || db->db_buf->b_data) && 4820a586ceaSMark Shellenbaum db->db.db_data && db->db_blkid != DMU_BONUS_BLKID && 483fa9e4066Sahrens db->db_state != DB_FILL && !dn->dn_free_txg) { 484fa9e4066Sahrens /* 485fa9e4066Sahrens * If the blkptr isn't set but they have nonzero data, 486fa9e4066Sahrens * it had better be dirty, otherwise we'll lose that 487fa9e4066Sahrens * data when we evict this buffer. 488fa9e4066Sahrens */ 489fa9e4066Sahrens if (db->db_dirtycnt == 0) { 490fa9e4066Sahrens uint64_t *buf = db->db.db_data; 491fa9e4066Sahrens int i; 492fa9e4066Sahrens 493fa9e4066Sahrens for (i = 0; i < db->db.db_size >> 3; i++) { 494fa9e4066Sahrens ASSERT(buf[i] == 0); 495fa9e4066Sahrens } 496fa9e4066Sahrens } 497fa9e4066Sahrens } 498744947dcSTom Erickson DB_DNODE_EXIT(db); 499fa9e4066Sahrens } 5009c9dc39aSek110237 #endif 501fa9e4066Sahrens 502fa9e4066Sahrens static void 503bc9014e6SJustin Gibbs dbuf_clear_data(dmu_buf_impl_t *db) 504fa9e4066Sahrens { 505fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 506ea8dc4b6Seschrock dbuf_evict_user(db); 507bc9014e6SJustin Gibbs db->db_buf = NULL; 508ea8dc4b6Seschrock db->db.db_data = NULL; 50982c9918fSTim Haley if (db->db_state != DB_NOFILL) 510ea8dc4b6Seschrock db->db_state = DB_UNCACHED; 511ea8dc4b6Seschrock } 512bc9014e6SJustin Gibbs 513bc9014e6SJustin Gibbs static void 514bc9014e6SJustin Gibbs dbuf_set_data(dmu_buf_impl_t *db, arc_buf_t *buf) 515bc9014e6SJustin Gibbs { 516bc9014e6SJustin Gibbs ASSERT(MUTEX_HELD(&db->db_mtx)); 517bc9014e6SJustin Gibbs ASSERT(buf != NULL); 518bc9014e6SJustin Gibbs 519bc9014e6SJustin Gibbs db->db_buf = buf; 520bc9014e6SJustin Gibbs ASSERT(buf->b_data != NULL); 521bc9014e6SJustin Gibbs db->db.db_data = buf->b_data; 522bc9014e6SJustin Gibbs if (!arc_released(buf)) 523bc9014e6SJustin Gibbs arc_set_callback(buf, dbuf_do_evict, db); 524fa9e4066Sahrens } 525fa9e4066Sahrens 526c242f9a0Schunli zhang - Sun Microsystems - Irvine United States /* 527c242f9a0Schunli zhang - Sun Microsystems - Irvine United States * Loan out an arc_buf for read. Return the loaned arc_buf. 528c242f9a0Schunli zhang - Sun Microsystems - Irvine United States */ 529c242f9a0Schunli zhang - Sun Microsystems - Irvine United States arc_buf_t * 530c242f9a0Schunli zhang - Sun Microsystems - Irvine United States dbuf_loan_arcbuf(dmu_buf_impl_t *db) 531c242f9a0Schunli zhang - Sun Microsystems - Irvine United States { 532c242f9a0Schunli zhang - Sun Microsystems - Irvine United States arc_buf_t *abuf; 533c242f9a0Schunli zhang - Sun Microsystems - Irvine United States 534c242f9a0Schunli zhang - Sun Microsystems - Irvine United States mutex_enter(&db->db_mtx); 535c242f9a0Schunli zhang - Sun Microsystems - Irvine United States if (arc_released(db->db_buf) || refcount_count(&db->db_holds) > 1) { 536c242f9a0Schunli zhang - Sun Microsystems - Irvine United States int blksz = db->db.db_size; 53743466aaeSMax Grossman spa_t *spa = db->db_objset->os_spa; 538744947dcSTom Erickson 539c242f9a0Schunli zhang - Sun Microsystems - Irvine United States mutex_exit(&db->db_mtx); 540744947dcSTom Erickson abuf = arc_loan_buf(spa, blksz); 541c242f9a0Schunli zhang - Sun Microsystems - Irvine United States bcopy(db->db.db_data, abuf->b_data, blksz); 542c242f9a0Schunli zhang - Sun Microsystems - Irvine United States } else { 543c242f9a0Schunli zhang - Sun Microsystems - Irvine United States abuf = db->db_buf; 544c242f9a0Schunli zhang - Sun Microsystems - Irvine United States arc_loan_inuse_buf(abuf, db); 545bc9014e6SJustin Gibbs dbuf_clear_data(db); 546c242f9a0Schunli zhang - Sun Microsystems - Irvine United States mutex_exit(&db->db_mtx); 547c242f9a0Schunli zhang - Sun Microsystems - Irvine United States } 548c242f9a0Schunli zhang - Sun Microsystems - Irvine United States return (abuf); 549c242f9a0Schunli zhang - Sun Microsystems - Irvine United States } 550c242f9a0Schunli zhang - Sun Microsystems - Irvine United States 551a2cdcdd2SPaul Dagnelie /* 552a2cdcdd2SPaul Dagnelie * Calculate which level n block references the data at the level 0 offset 553a2cdcdd2SPaul Dagnelie * provided. 554a2cdcdd2SPaul Dagnelie */ 555fa9e4066Sahrens uint64_t 556a2cdcdd2SPaul Dagnelie dbuf_whichblock(dnode_t *dn, int64_t level, uint64_t offset) 557fa9e4066Sahrens { 558a2cdcdd2SPaul Dagnelie if (dn->dn_datablkshift != 0 && dn->dn_indblkshift != 0) { 559a2cdcdd2SPaul Dagnelie /* 560a2cdcdd2SPaul Dagnelie * The level n blkid is equal to the level 0 blkid divided by 561a2cdcdd2SPaul Dagnelie * the number of level 0s in a level n block. 562a2cdcdd2SPaul Dagnelie * 563a2cdcdd2SPaul Dagnelie * The level 0 blkid is offset >> datablkshift = 564a2cdcdd2SPaul Dagnelie * offset / 2^datablkshift. 565a2cdcdd2SPaul Dagnelie * 566a2cdcdd2SPaul Dagnelie * The number of level 0s in a level n is the number of block 567a2cdcdd2SPaul Dagnelie * pointers in an indirect block, raised to the power of level. 568a2cdcdd2SPaul Dagnelie * This is 2^(indblkshift - SPA_BLKPTRSHIFT)^level = 569a2cdcdd2SPaul Dagnelie * 2^(level*(indblkshift - SPA_BLKPTRSHIFT)). 570a2cdcdd2SPaul Dagnelie * 571a2cdcdd2SPaul Dagnelie * Thus, the level n blkid is: offset / 572a2cdcdd2SPaul Dagnelie * ((2^datablkshift)*(2^(level*(indblkshift - SPA_BLKPTRSHIFT))) 573a2cdcdd2SPaul Dagnelie * = offset / 2^(datablkshift + level * 574a2cdcdd2SPaul Dagnelie * (indblkshift - SPA_BLKPTRSHIFT)) 575a2cdcdd2SPaul Dagnelie * = offset >> (datablkshift + level * 576a2cdcdd2SPaul Dagnelie * (indblkshift - SPA_BLKPTRSHIFT)) 577a2cdcdd2SPaul Dagnelie */ 578a2cdcdd2SPaul Dagnelie return (offset >> (dn->dn_datablkshift + level * 579a2cdcdd2SPaul Dagnelie (dn->dn_indblkshift - SPA_BLKPTRSHIFT))); 580fa9e4066Sahrens } else { 581fa9e4066Sahrens ASSERT3U(offset, <, dn->dn_datablksz); 582fa9e4066Sahrens return (0); 583fa9e4066Sahrens } 584fa9e4066Sahrens } 585fa9e4066Sahrens 586fa9e4066Sahrens static void 587fa9e4066Sahrens dbuf_read_done(zio_t *zio, arc_buf_t *buf, void *vdb) 588fa9e4066Sahrens { 589fa9e4066Sahrens dmu_buf_impl_t *db = vdb; 590fa9e4066Sahrens 591fa9e4066Sahrens mutex_enter(&db->db_mtx); 592fa9e4066Sahrens ASSERT3U(db->db_state, ==, DB_READ); 593fa9e4066Sahrens /* 594fa9e4066Sahrens * All reads are synchronous, so we must have a hold on the dbuf 595fa9e4066Sahrens */ 596fa9e4066Sahrens ASSERT(refcount_count(&db->db_holds) > 0); 597ea8dc4b6Seschrock ASSERT(db->db_buf == NULL); 598fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 599c717a561Smaybee if (db->db_level == 0 && db->db_freed_in_flight) { 600fa9e4066Sahrens /* we were freed in flight; disregard any error */ 601fa9e4066Sahrens arc_release(buf, db); 602fa9e4066Sahrens bzero(buf->b_data, db->db.db_size); 6036b4acc8bSahrens arc_buf_freeze(buf); 604c717a561Smaybee db->db_freed_in_flight = FALSE; 605fa9e4066Sahrens dbuf_set_data(db, buf); 606fa9e4066Sahrens db->db_state = DB_CACHED; 607fa9e4066Sahrens } else if (zio == NULL || zio->io_error == 0) { 608fa9e4066Sahrens dbuf_set_data(db, buf); 609fa9e4066Sahrens db->db_state = DB_CACHED; 610fa9e4066Sahrens } else { 6110a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 612fa9e4066Sahrens ASSERT3P(db->db_buf, ==, NULL); 6133b2aab18SMatthew Ahrens VERIFY(arc_buf_remove_ref(buf, db)); 614ea8dc4b6Seschrock db->db_state = DB_UNCACHED; 615fa9e4066Sahrens } 616fa9e4066Sahrens cv_broadcast(&db->db_changed); 6173f9d6ad7SLin Ling dbuf_rele_and_unlock(db, NULL); 618fa9e4066Sahrens } 619fa9e4066Sahrens 620ea8dc4b6Seschrock static void 62113506d1eSmaybee dbuf_read_impl(dmu_buf_impl_t *db, zio_t *zio, uint32_t *flags) 622fa9e4066Sahrens { 623744947dcSTom Erickson dnode_t *dn; 6247802d7bfSMatthew Ahrens zbookmark_phys_t zb; 6257adb730bSGeorge Wilson arc_flags_t aflags = ARC_FLAG_NOWAIT; 626fa9e4066Sahrens 627744947dcSTom Erickson DB_DNODE_ENTER(db); 628744947dcSTom Erickson dn = DB_DNODE(db); 629fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 630fa9e4066Sahrens /* We need the struct_rwlock to prevent db_blkptr from changing. */ 631088f3894Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 632ea8dc4b6Seschrock ASSERT(MUTEX_HELD(&db->db_mtx)); 633ea8dc4b6Seschrock ASSERT(db->db_state == DB_UNCACHED); 634ea8dc4b6Seschrock ASSERT(db->db_buf == NULL); 635fa9e4066Sahrens 6360a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 637cf04dda1SMark Maybee int bonuslen = MIN(dn->dn_bonuslen, dn->dn_phys->dn_bonuslen); 6381934e92fSmaybee 6391934e92fSmaybee ASSERT3U(bonuslen, <=, db->db.db_size); 640ea8dc4b6Seschrock db->db.db_data = zio_buf_alloc(DN_MAX_BONUSLEN); 6415a98e54bSBrendan Gregg - Sun Microsystems arc_space_consume(DN_MAX_BONUSLEN, ARC_SPACE_OTHER); 6421934e92fSmaybee if (bonuslen < DN_MAX_BONUSLEN) 643ea8dc4b6Seschrock bzero(db->db.db_data, DN_MAX_BONUSLEN); 644cf04dda1SMark Maybee if (bonuslen) 645cf04dda1SMark Maybee bcopy(DN_BONUS(dn->dn_phys), db->db.db_data, bonuslen); 646744947dcSTom Erickson DB_DNODE_EXIT(db); 647fa9e4066Sahrens db->db_state = DB_CACHED; 648fa9e4066Sahrens mutex_exit(&db->db_mtx); 649fa9e4066Sahrens return; 650fa9e4066Sahrens } 651fa9e4066Sahrens 6521c8564a7SMark Maybee /* 6531c8564a7SMark Maybee * Recheck BP_IS_HOLE() after dnode_block_freed() in case dnode_sync() 6541c8564a7SMark Maybee * processes the delete record and clears the bp while we are waiting 6551c8564a7SMark Maybee * for the dn_mtx (resulting in a "no" from block_freed). 6561c8564a7SMark Maybee */ 657088f3894Sahrens if (db->db_blkptr == NULL || BP_IS_HOLE(db->db_blkptr) || 6581c8564a7SMark Maybee (db->db_level == 0 && (dnode_block_freed(dn, db->db_blkid) || 6591c8564a7SMark Maybee BP_IS_HOLE(db->db_blkptr)))) { 660ad23a2dbSjohansen arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 661ad23a2dbSjohansen 662744947dcSTom Erickson DB_DNODE_EXIT(db); 66343466aaeSMax Grossman dbuf_set_data(db, arc_buf_alloc(db->db_objset->os_spa, 66443466aaeSMax Grossman db->db.db_size, db, type)); 665fa9e4066Sahrens bzero(db->db.db_data, db->db.db_size); 666fa9e4066Sahrens db->db_state = DB_CACHED; 66713506d1eSmaybee *flags |= DB_RF_CACHED; 668fa9e4066Sahrens mutex_exit(&db->db_mtx); 669fa9e4066Sahrens return; 670fa9e4066Sahrens } 671fa9e4066Sahrens 672744947dcSTom Erickson DB_DNODE_EXIT(db); 673744947dcSTom Erickson 674fa9e4066Sahrens db->db_state = DB_READ; 675fa9e4066Sahrens mutex_exit(&db->db_mtx); 676fa9e4066Sahrens 6773baa08fcSek110237 if (DBUF_IS_L2CACHEABLE(db)) 6787adb730bSGeorge Wilson aflags |= ARC_FLAG_L2CACHE; 679aad02571SSaso Kiselkov if (DBUF_IS_L2COMPRESSIBLE(db)) 6807adb730bSGeorge Wilson aflags |= ARC_FLAG_L2COMPRESS; 6813baa08fcSek110237 682b24ab676SJeff Bonwick SET_BOOKMARK(&zb, db->db_objset->os_dsl_dataset ? 683b24ab676SJeff Bonwick db->db_objset->os_dsl_dataset->ds_object : DMU_META_OBJSET, 684b24ab676SJeff Bonwick db->db.db_object, db->db_level, db->db_blkid); 685ea8dc4b6Seschrock 686ea8dc4b6Seschrock dbuf_add_ref(db, NULL); 687088f3894Sahrens 68843466aaeSMax Grossman (void) arc_read(zio, db->db_objset->os_spa, db->db_blkptr, 689fa9e4066Sahrens dbuf_read_done, db, ZIO_PRIORITY_SYNC_READ, 69013506d1eSmaybee (*flags & DB_RF_CANFAIL) ? ZIO_FLAG_CANFAIL : ZIO_FLAG_MUSTSUCCEED, 69113506d1eSmaybee &aflags, &zb); 6927adb730bSGeorge Wilson if (aflags & ARC_FLAG_CACHED) 69313506d1eSmaybee *flags |= DB_RF_CACHED; 694fa9e4066Sahrens } 695fa9e4066Sahrens 696ea8dc4b6Seschrock int 697ea8dc4b6Seschrock dbuf_read(dmu_buf_impl_t *db, zio_t *zio, uint32_t flags) 698fa9e4066Sahrens { 699ea8dc4b6Seschrock int err = 0; 70043466aaeSMax Grossman boolean_t havepzio = (zio != NULL); 70143466aaeSMax Grossman boolean_t prefetch; 702744947dcSTom Erickson dnode_t *dn; 703fa9e4066Sahrens 704fa9e4066Sahrens /* 705fa9e4066Sahrens * We don't have to hold the mutex to check db_state because it 706fa9e4066Sahrens * can't be freed while we have a hold on the buffer. 707fa9e4066Sahrens */ 708fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 709fa9e4066Sahrens 71082c9918fSTim Haley if (db->db_state == DB_NOFILL) 711be6fd75aSMatthew Ahrens return (SET_ERROR(EIO)); 71282c9918fSTim Haley 713744947dcSTom Erickson DB_DNODE_ENTER(db); 714744947dcSTom Erickson dn = DB_DNODE(db); 715fa9e4066Sahrens if ((flags & DB_RF_HAVESTRUCT) == 0) 716744947dcSTom Erickson rw_enter(&dn->dn_struct_rwlock, RW_READER); 717fa9e4066Sahrens 7180a586ceaSMark Shellenbaum prefetch = db->db_level == 0 && db->db_blkid != DMU_BONUS_BLKID && 719744947dcSTom Erickson (flags & DB_RF_NOPREFETCH) == 0 && dn != NULL && 7203baa08fcSek110237 DBUF_IS_CACHEABLE(db); 72113506d1eSmaybee 722fa9e4066Sahrens mutex_enter(&db->db_mtx); 723ea8dc4b6Seschrock if (db->db_state == DB_CACHED) { 724ea8dc4b6Seschrock mutex_exit(&db->db_mtx); 72513506d1eSmaybee if (prefetch) 726744947dcSTom Erickson dmu_zfetch(&dn->dn_zfetch, db->db.db_offset, 72713506d1eSmaybee db->db.db_size, TRUE); 728ea8dc4b6Seschrock if ((flags & DB_RF_HAVESTRUCT) == 0) 729744947dcSTom Erickson rw_exit(&dn->dn_struct_rwlock); 730744947dcSTom Erickson DB_DNODE_EXIT(db); 731ea8dc4b6Seschrock } else if (db->db_state == DB_UNCACHED) { 732744947dcSTom Erickson spa_t *spa = dn->dn_objset->os_spa; 733744947dcSTom Erickson 734744947dcSTom Erickson if (zio == NULL) 735744947dcSTom Erickson zio = zio_root(spa, NULL, NULL, ZIO_FLAG_CANFAIL); 73613506d1eSmaybee dbuf_read_impl(db, zio, &flags); 73713506d1eSmaybee 738ea8dc4b6Seschrock /* dbuf_read_impl has dropped db_mtx for us */ 739ea8dc4b6Seschrock 74013506d1eSmaybee if (prefetch) 741744947dcSTom Erickson dmu_zfetch(&dn->dn_zfetch, db->db.db_offset, 74213506d1eSmaybee db->db.db_size, flags & DB_RF_CACHED); 743ea8dc4b6Seschrock 744ea8dc4b6Seschrock if ((flags & DB_RF_HAVESTRUCT) == 0) 745744947dcSTom Erickson rw_exit(&dn->dn_struct_rwlock); 746744947dcSTom Erickson DB_DNODE_EXIT(db); 747ea8dc4b6Seschrock 748ea8dc4b6Seschrock if (!havepzio) 749ea8dc4b6Seschrock err = zio_wait(zio); 750ea8dc4b6Seschrock } else { 7513e30c24aSWill Andrews /* 7523e30c24aSWill Andrews * Another reader came in while the dbuf was in flight 7533e30c24aSWill Andrews * between UNCACHED and CACHED. Either a writer will finish 7543e30c24aSWill Andrews * writing the buffer (sending the dbuf to CACHED) or the 7553e30c24aSWill Andrews * first reader's request will reach the read_done callback 7563e30c24aSWill Andrews * and send the dbuf to CACHED. Otherwise, a failure 7573e30c24aSWill Andrews * occurred and the dbuf went to UNCACHED. 7583e30c24aSWill Andrews */ 75913506d1eSmaybee mutex_exit(&db->db_mtx); 76013506d1eSmaybee if (prefetch) 761744947dcSTom Erickson dmu_zfetch(&dn->dn_zfetch, db->db.db_offset, 76213506d1eSmaybee db->db.db_size, TRUE); 763ea8dc4b6Seschrock if ((flags & DB_RF_HAVESTRUCT) == 0) 764744947dcSTom Erickson rw_exit(&dn->dn_struct_rwlock); 765744947dcSTom Erickson DB_DNODE_EXIT(db); 76613506d1eSmaybee 7673e30c24aSWill Andrews /* Skip the wait per the caller's request. */ 76813506d1eSmaybee mutex_enter(&db->db_mtx); 769ea8dc4b6Seschrock if ((flags & DB_RF_NEVERWAIT) == 0) { 770ea8dc4b6Seschrock while (db->db_state == DB_READ || 771ea8dc4b6Seschrock db->db_state == DB_FILL) { 772fa9e4066Sahrens ASSERT(db->db_state == DB_READ || 773fa9e4066Sahrens (flags & DB_RF_HAVESTRUCT) == 0); 774f6164ad6SAdam H. Leventhal DTRACE_PROBE2(blocked__read, dmu_buf_impl_t *, 775f6164ad6SAdam H. Leventhal db, zio_t *, zio); 776fa9e4066Sahrens cv_wait(&db->db_changed, &db->db_mtx); 777fa9e4066Sahrens } 778ea8dc4b6Seschrock if (db->db_state == DB_UNCACHED) 779be6fd75aSMatthew Ahrens err = SET_ERROR(EIO); 780ea8dc4b6Seschrock } 781fa9e4066Sahrens mutex_exit(&db->db_mtx); 782fa9e4066Sahrens } 783fa9e4066Sahrens 784ea8dc4b6Seschrock ASSERT(err || havepzio || db->db_state == DB_CACHED); 785ea8dc4b6Seschrock return (err); 786fa9e4066Sahrens } 787fa9e4066Sahrens 788fa9e4066Sahrens static void 789fa9e4066Sahrens dbuf_noread(dmu_buf_impl_t *db) 790fa9e4066Sahrens { 791fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 7920a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 793fa9e4066Sahrens mutex_enter(&db->db_mtx); 794fa9e4066Sahrens while (db->db_state == DB_READ || db->db_state == DB_FILL) 795fa9e4066Sahrens cv_wait(&db->db_changed, &db->db_mtx); 796fa9e4066Sahrens if (db->db_state == DB_UNCACHED) { 797ad23a2dbSjohansen arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 79843466aaeSMax Grossman spa_t *spa = db->db_objset->os_spa; 799ad23a2dbSjohansen 800ea8dc4b6Seschrock ASSERT(db->db_buf == NULL); 801fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 802744947dcSTom Erickson dbuf_set_data(db, arc_buf_alloc(spa, db->db.db_size, db, type)); 803fa9e4066Sahrens db->db_state = DB_FILL; 80482c9918fSTim Haley } else if (db->db_state == DB_NOFILL) { 805bc9014e6SJustin Gibbs dbuf_clear_data(db); 806fa9e4066Sahrens } else { 807fa9e4066Sahrens ASSERT3U(db->db_state, ==, DB_CACHED); 808fa9e4066Sahrens } 809fa9e4066Sahrens mutex_exit(&db->db_mtx); 810fa9e4066Sahrens } 811fa9e4066Sahrens 812fa9e4066Sahrens /* 813fa9e4066Sahrens * This is our just-in-time copy function. It makes a copy of 814fa9e4066Sahrens * buffers, that have been modified in a previous transaction 815fa9e4066Sahrens * group, before we modify them in the current active group. 816fa9e4066Sahrens * 817fa9e4066Sahrens * This function is used in two places: when we are dirtying a 818fa9e4066Sahrens * buffer for the first time in a txg, and when we are freeing 819fa9e4066Sahrens * a range in a dnode that includes this buffer. 820fa9e4066Sahrens * 821fa9e4066Sahrens * Note that when we are called from dbuf_free_range() we do 822fa9e4066Sahrens * not put a hold on the buffer, we just traverse the active 823fa9e4066Sahrens * dbuf list for the dnode. 824fa9e4066Sahrens */ 825fa9e4066Sahrens static void 826fa9e4066Sahrens dbuf_fix_old_data(dmu_buf_impl_t *db, uint64_t txg) 827fa9e4066Sahrens { 828c717a561Smaybee dbuf_dirty_record_t *dr = db->db_last_dirty; 829fa9e4066Sahrens 830fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 831fa9e4066Sahrens ASSERT(db->db.db_data != NULL); 832c717a561Smaybee ASSERT(db->db_level == 0); 833c717a561Smaybee ASSERT(db->db.db_object != DMU_META_DNODE_OBJECT); 834fa9e4066Sahrens 8354d31c452Smaybee if (dr == NULL || 8364d31c452Smaybee (dr->dt.dl.dr_data != 8370a586ceaSMark Shellenbaum ((db->db_blkid == DMU_BONUS_BLKID) ? db->db.db_data : db->db_buf))) 838fa9e4066Sahrens return; 839fa9e4066Sahrens 840fa9e4066Sahrens /* 841c717a561Smaybee * If the last dirty record for this dbuf has not yet synced 842c717a561Smaybee * and its referencing the dbuf data, either: 843c717a561Smaybee * reset the reference to point to a new copy, 844c717a561Smaybee * or (if there a no active holders) 845c717a561Smaybee * just null out the current db_data pointer. 846fa9e4066Sahrens */ 847c717a561Smaybee ASSERT(dr->dr_txg >= txg - 2); 8480a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 849c717a561Smaybee /* Note that the data bufs here are zio_bufs */ 850c717a561Smaybee dr->dt.dl.dr_data = zio_buf_alloc(DN_MAX_BONUSLEN); 8515a98e54bSBrendan Gregg - Sun Microsystems arc_space_consume(DN_MAX_BONUSLEN, ARC_SPACE_OTHER); 852c717a561Smaybee bcopy(db->db.db_data, dr->dt.dl.dr_data, DN_MAX_BONUSLEN); 853c717a561Smaybee } else if (refcount_count(&db->db_holds) > db->db_dirtycnt) { 854ea8dc4b6Seschrock int size = db->db.db_size; 855c717a561Smaybee arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 85643466aaeSMax Grossman spa_t *spa = db->db_objset->os_spa; 857744947dcSTom Erickson 858744947dcSTom Erickson dr->dt.dl.dr_data = arc_buf_alloc(spa, size, db, type); 859c717a561Smaybee bcopy(db->db.db_data, dr->dt.dl.dr_data->b_data, size); 860fa9e4066Sahrens } else { 861bc9014e6SJustin Gibbs dbuf_clear_data(db); 862fa9e4066Sahrens } 863fa9e4066Sahrens } 864ea8dc4b6Seschrock 865fa9e4066Sahrens void 866c717a561Smaybee dbuf_unoverride(dbuf_dirty_record_t *dr) 867fa9e4066Sahrens { 868c717a561Smaybee dmu_buf_impl_t *db = dr->dr_dbuf; 869b24ab676SJeff Bonwick blkptr_t *bp = &dr->dt.dl.dr_overridden_by; 870c717a561Smaybee uint64_t txg = dr->dr_txg; 871c5c6ffa0Smaybee 872c717a561Smaybee ASSERT(MUTEX_HELD(&db->db_mtx)); 873c717a561Smaybee ASSERT(dr->dt.dl.dr_override_state != DR_IN_DMU_SYNC); 874c717a561Smaybee ASSERT(db->db_level == 0); 875c717a561Smaybee 8760a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID || 877c717a561Smaybee dr->dt.dl.dr_override_state == DR_NOT_OVERRIDDEN) 878c717a561Smaybee return; 879c717a561Smaybee 880b24ab676SJeff Bonwick ASSERT(db->db_data_pending != dr); 881b24ab676SJeff Bonwick 882fa9e4066Sahrens /* free this block */ 88343466aaeSMax Grossman if (!BP_IS_HOLE(bp) && !dr->dt.dl.dr_nopwrite) 88443466aaeSMax Grossman zio_free(db->db_objset->os_spa, txg, bp); 885b24ab676SJeff Bonwick 886c717a561Smaybee dr->dt.dl.dr_override_state = DR_NOT_OVERRIDDEN; 88780901aeaSGeorge Wilson dr->dt.dl.dr_nopwrite = B_FALSE; 88880901aeaSGeorge Wilson 8896b4acc8bSahrens /* 8906b4acc8bSahrens * Release the already-written buffer, so we leave it in 8916b4acc8bSahrens * a consistent dirty state. Note that all callers are 8926b4acc8bSahrens * modifying the buffer, so they will immediately do 8936b4acc8bSahrens * another (redundant) arc_release(). Therefore, leave 8946b4acc8bSahrens * the buf thawed to save the effort of freezing & 8956b4acc8bSahrens * immediately re-thawing it. 8966b4acc8bSahrens */ 897c717a561Smaybee arc_release(dr->dt.dl.dr_data, db); 898fa9e4066Sahrens } 899fa9e4066Sahrens 900cdb0ab79Smaybee /* 901cdb0ab79Smaybee * Evict (if its unreferenced) or clear (if its referenced) any level-0 902cdb0ab79Smaybee * data blocks in the free range, so that any future readers will find 90343466aaeSMax Grossman * empty blocks. 9042f3d8780SMatthew Ahrens * 9052f3d8780SMatthew Ahrens * This is a no-op if the dataset is in the middle of an incremental 9062f3d8780SMatthew Ahrens * receive; see comment below for details. 907cdb0ab79Smaybee */ 908fa9e4066Sahrens void 9090f6d88adSAlex Reece dbuf_free_range(dnode_t *dn, uint64_t start_blkid, uint64_t end_blkid, 9100f6d88adSAlex Reece dmu_tx_t *tx) 911fa9e4066Sahrens { 912bc9014e6SJustin Gibbs dmu_buf_impl_t db_search; 913bc9014e6SJustin Gibbs dmu_buf_impl_t *db, *db_next; 914fa9e4066Sahrens uint64_t txg = tx->tx_txg; 9150f6d88adSAlex Reece avl_index_t where; 916fa9e4066Sahrens 9170f6d88adSAlex Reece if (end_blkid > dn->dn_maxblkid && (end_blkid != DMU_SPILL_BLKID)) 9180f6d88adSAlex Reece end_blkid = dn->dn_maxblkid; 9190f6d88adSAlex Reece dprintf_dnode(dn, "start=%llu end=%llu\n", start_blkid, end_blkid); 9200f6d88adSAlex Reece 9210f6d88adSAlex Reece db_search.db_level = 0; 9220f6d88adSAlex Reece db_search.db_blkid = start_blkid; 92386bb58aeSAlex Reece db_search.db_state = DB_SEARCH; 9242f3d8780SMatthew Ahrens 925713d6c20SMatthew Ahrens mutex_enter(&dn->dn_dbufs_mtx); 9260f6d88adSAlex Reece if (start_blkid >= dn->dn_unlisted_l0_blkid) { 927713d6c20SMatthew Ahrens /* There can't be any dbufs in this range; no need to search. */ 9280f6d88adSAlex Reece #ifdef DEBUG 9290f6d88adSAlex Reece db = avl_find(&dn->dn_dbufs, &db_search, &where); 9300f6d88adSAlex Reece ASSERT3P(db, ==, NULL); 9310f6d88adSAlex Reece db = avl_nearest(&dn->dn_dbufs, where, AVL_AFTER); 9320f6d88adSAlex Reece ASSERT(db == NULL || db->db_level > 0); 9330f6d88adSAlex Reece #endif 934713d6c20SMatthew Ahrens mutex_exit(&dn->dn_dbufs_mtx); 9352f3d8780SMatthew Ahrens return; 936713d6c20SMatthew Ahrens } else if (dmu_objset_is_receiving(dn->dn_objset)) { 937713d6c20SMatthew Ahrens /* 938713d6c20SMatthew Ahrens * If we are receiving, we expect there to be no dbufs in 939713d6c20SMatthew Ahrens * the range to be freed, because receive modifies each 940713d6c20SMatthew Ahrens * block at most once, and in offset order. If this is 941713d6c20SMatthew Ahrens * not the case, it can lead to performance problems, 942713d6c20SMatthew Ahrens * so note that we unexpectedly took the slow path. 943713d6c20SMatthew Ahrens */ 944713d6c20SMatthew Ahrens atomic_inc_64(&zfs_free_range_recv_miss); 9452f3d8780SMatthew Ahrens } 9462f3d8780SMatthew Ahrens 9470f6d88adSAlex Reece db = avl_find(&dn->dn_dbufs, &db_search, &where); 9480f6d88adSAlex Reece ASSERT3P(db, ==, NULL); 9490f6d88adSAlex Reece db = avl_nearest(&dn->dn_dbufs, where, AVL_AFTER); 9500f6d88adSAlex Reece 9510f6d88adSAlex Reece for (; db != NULL; db = db_next) { 9520f6d88adSAlex Reece db_next = AVL_NEXT(&dn->dn_dbufs, db); 9530a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 954cdb0ab79Smaybee 9550f6d88adSAlex Reece if (db->db_level != 0 || db->db_blkid > end_blkid) { 9560f6d88adSAlex Reece break; 9570f6d88adSAlex Reece } 9580f6d88adSAlex Reece ASSERT3U(db->db_blkid, >=, start_blkid); 959fa9e4066Sahrens 960fa9e4066Sahrens /* found a level 0 buffer in the range */ 961fa9e4066Sahrens mutex_enter(&db->db_mtx); 9623b2aab18SMatthew Ahrens if (dbuf_undirty(db, tx)) { 9633b2aab18SMatthew Ahrens /* mutex has been dropped and dbuf destroyed */ 9643b2aab18SMatthew Ahrens continue; 9653b2aab18SMatthew Ahrens } 9663b2aab18SMatthew Ahrens 967ea8dc4b6Seschrock if (db->db_state == DB_UNCACHED || 96882c9918fSTim Haley db->db_state == DB_NOFILL || 969ea8dc4b6Seschrock db->db_state == DB_EVICTING) { 970fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 971fa9e4066Sahrens mutex_exit(&db->db_mtx); 972fa9e4066Sahrens continue; 973fa9e4066Sahrens } 974c543ec06Sahrens if (db->db_state == DB_READ || db->db_state == DB_FILL) { 975c543ec06Sahrens /* will be handled in dbuf_read_done or dbuf_rele */ 976c717a561Smaybee db->db_freed_in_flight = TRUE; 977fa9e4066Sahrens mutex_exit(&db->db_mtx); 978fa9e4066Sahrens continue; 979fa9e4066Sahrens } 980ea8dc4b6Seschrock if (refcount_count(&db->db_holds) == 0) { 981ea8dc4b6Seschrock ASSERT(db->db_buf); 982ea8dc4b6Seschrock dbuf_clear(db); 983ea8dc4b6Seschrock continue; 984ea8dc4b6Seschrock } 985c717a561Smaybee /* The dbuf is referenced */ 986fa9e4066Sahrens 987c717a561Smaybee if (db->db_last_dirty != NULL) { 988c717a561Smaybee dbuf_dirty_record_t *dr = db->db_last_dirty; 989c717a561Smaybee 990c717a561Smaybee if (dr->dr_txg == txg) { 991ea8dc4b6Seschrock /* 992c717a561Smaybee * This buffer is "in-use", re-adjust the file 993c717a561Smaybee * size to reflect that this buffer may 994c717a561Smaybee * contain new data when we sync. 995ea8dc4b6Seschrock */ 99606e0070dSMark Shellenbaum if (db->db_blkid != DMU_SPILL_BLKID && 99706e0070dSMark Shellenbaum db->db_blkid > dn->dn_maxblkid) 99844eda4d7Smaybee dn->dn_maxblkid = db->db_blkid; 999c717a561Smaybee dbuf_unoverride(dr); 1000c717a561Smaybee } else { 1001c717a561Smaybee /* 1002c717a561Smaybee * This dbuf is not dirty in the open context. 1003c717a561Smaybee * Either uncache it (if its not referenced in 1004c717a561Smaybee * the open context) or reset its contents to 1005c717a561Smaybee * empty. 1006c717a561Smaybee */ 1007c717a561Smaybee dbuf_fix_old_data(db, txg); 100844eda4d7Smaybee } 1009c717a561Smaybee } 1010c717a561Smaybee /* clear the contents if its cached */ 1011ea8dc4b6Seschrock if (db->db_state == DB_CACHED) { 1012ea8dc4b6Seschrock ASSERT(db->db.db_data != NULL); 1013fa9e4066Sahrens arc_release(db->db_buf, db); 1014fa9e4066Sahrens bzero(db->db.db_data, db->db.db_size); 10156b4acc8bSahrens arc_buf_freeze(db->db_buf); 1016fa9e4066Sahrens } 1017ea8dc4b6Seschrock 1018fa9e4066Sahrens mutex_exit(&db->db_mtx); 1019fa9e4066Sahrens } 1020fa9e4066Sahrens mutex_exit(&dn->dn_dbufs_mtx); 1021fa9e4066Sahrens } 1022fa9e4066Sahrens 1023fa9e4066Sahrens static int 10241934e92fSmaybee dbuf_block_freeable(dmu_buf_impl_t *db) 1025fa9e4066Sahrens { 1026fa9e4066Sahrens dsl_dataset_t *ds = db->db_objset->os_dsl_dataset; 1027fa9e4066Sahrens uint64_t birth_txg = 0; 1028fa9e4066Sahrens 1029fa9e4066Sahrens /* 1030fa9e4066Sahrens * We don't need any locking to protect db_blkptr: 1031c717a561Smaybee * If it's syncing, then db_last_dirty will be set 1032c717a561Smaybee * so we'll ignore db_blkptr. 103343466aaeSMax Grossman * 103443466aaeSMax Grossman * This logic ensures that only block births for 103543466aaeSMax Grossman * filled blocks are considered. 1036fa9e4066Sahrens */ 1037c717a561Smaybee ASSERT(MUTEX_HELD(&db->db_mtx)); 103843466aaeSMax Grossman if (db->db_last_dirty && (db->db_blkptr == NULL || 103943466aaeSMax Grossman !BP_IS_HOLE(db->db_blkptr))) { 1040c717a561Smaybee birth_txg = db->db_last_dirty->dr_txg; 104143466aaeSMax Grossman } else if (db->db_blkptr != NULL && !BP_IS_HOLE(db->db_blkptr)) { 1042fa9e4066Sahrens birth_txg = db->db_blkptr->blk_birth; 104343466aaeSMax Grossman } 1044fa9e4066Sahrens 1045837b568bSGeorge Wilson /* 104643466aaeSMax Grossman * If this block don't exist or is in a snapshot, it can't be freed. 1047837b568bSGeorge Wilson * Don't pass the bp to dsl_dataset_block_freeable() since we 1048837b568bSGeorge Wilson * are holding the db_mtx lock and might deadlock if we are 1049837b568bSGeorge Wilson * prefetching a dedup-ed block. 1050837b568bSGeorge Wilson */ 105143466aaeSMax Grossman if (birth_txg != 0) 10521934e92fSmaybee return (ds == NULL || 1053837b568bSGeorge Wilson dsl_dataset_block_freeable(ds, NULL, birth_txg)); 1054fa9e4066Sahrens else 105543466aaeSMax Grossman return (B_FALSE); 1056fa9e4066Sahrens } 1057fa9e4066Sahrens 1058fa9e4066Sahrens void 1059fa9e4066Sahrens dbuf_new_size(dmu_buf_impl_t *db, int size, dmu_tx_t *tx) 1060fa9e4066Sahrens { 1061fa9e4066Sahrens arc_buf_t *buf, *obuf; 1062fa9e4066Sahrens int osize = db->db.db_size; 1063ad23a2dbSjohansen arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 1064744947dcSTom Erickson dnode_t *dn; 1065fa9e4066Sahrens 10660a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 1067ea8dc4b6Seschrock 1068744947dcSTom Erickson DB_DNODE_ENTER(db); 1069744947dcSTom Erickson dn = DB_DNODE(db); 1070744947dcSTom Erickson 1071fa9e4066Sahrens /* XXX does *this* func really need the lock? */ 1072744947dcSTom Erickson ASSERT(RW_WRITE_HELD(&dn->dn_struct_rwlock)); 1073fa9e4066Sahrens 1074fa9e4066Sahrens /* 107543466aaeSMax Grossman * This call to dmu_buf_will_dirty() with the dn_struct_rwlock held 1076fa9e4066Sahrens * is OK, because there can be no other references to the db 1077fa9e4066Sahrens * when we are changing its size, so no concurrent DB_FILL can 1078fa9e4066Sahrens * be happening. 1079fa9e4066Sahrens */ 1080ea8dc4b6Seschrock /* 1081ea8dc4b6Seschrock * XXX we should be doing a dbuf_read, checking the return 1082ea8dc4b6Seschrock * value and returning that up to our callers 1083ea8dc4b6Seschrock */ 108443466aaeSMax Grossman dmu_buf_will_dirty(&db->db, tx); 1085fa9e4066Sahrens 1086fa9e4066Sahrens /* create the data buffer for the new block */ 1087744947dcSTom Erickson buf = arc_buf_alloc(dn->dn_objset->os_spa, size, db, type); 1088fa9e4066Sahrens 1089fa9e4066Sahrens /* copy old block data to the new block */ 1090fa9e4066Sahrens obuf = db->db_buf; 1091f65e61c0Sahrens bcopy(obuf->b_data, buf->b_data, MIN(osize, size)); 1092fa9e4066Sahrens /* zero the remainder */ 1093f65e61c0Sahrens if (size > osize) 1094fa9e4066Sahrens bzero((uint8_t *)buf->b_data + osize, size - osize); 1095fa9e4066Sahrens 1096fa9e4066Sahrens mutex_enter(&db->db_mtx); 1097fa9e4066Sahrens dbuf_set_data(db, buf); 10983b2aab18SMatthew Ahrens VERIFY(arc_buf_remove_ref(obuf, db)); 1099fa9e4066Sahrens db->db.db_size = size; 1100fa9e4066Sahrens 1101c717a561Smaybee if (db->db_level == 0) { 1102c717a561Smaybee ASSERT3U(db->db_last_dirty->dr_txg, ==, tx->tx_txg); 1103c717a561Smaybee db->db_last_dirty->dt.dl.dr_data = buf; 1104c717a561Smaybee } 1105fa9e4066Sahrens mutex_exit(&db->db_mtx); 1106fa9e4066Sahrens 1107744947dcSTom Erickson dnode_willuse_space(dn, size-osize, tx); 1108744947dcSTom Erickson DB_DNODE_EXIT(db); 1109fa9e4066Sahrens } 1110fa9e4066Sahrens 11113f9d6ad7SLin Ling void 11123f9d6ad7SLin Ling dbuf_release_bp(dmu_buf_impl_t *db) 11133f9d6ad7SLin Ling { 111443466aaeSMax Grossman objset_t *os = db->db_objset; 11153f9d6ad7SLin Ling 11163f9d6ad7SLin Ling ASSERT(dsl_pool_sync_context(dmu_objset_pool(os))); 11173f9d6ad7SLin Ling ASSERT(arc_released(os->os_phys_buf) || 11183f9d6ad7SLin Ling list_link_active(&os->os_dsl_dataset->ds_synced_link)); 11193f9d6ad7SLin Ling ASSERT(db->db_parent == NULL || arc_released(db->db_parent->db_buf)); 11203f9d6ad7SLin Ling 11211b912ec7SGeorge Wilson (void) arc_release(db->db_buf, db); 11223f9d6ad7SLin Ling } 11233f9d6ad7SLin Ling 1124c717a561Smaybee dbuf_dirty_record_t * 1125fa9e4066Sahrens dbuf_dirty(dmu_buf_impl_t *db, dmu_tx_t *tx) 1126fa9e4066Sahrens { 1127744947dcSTom Erickson dnode_t *dn; 1128744947dcSTom Erickson objset_t *os; 1129c717a561Smaybee dbuf_dirty_record_t **drp, *dr; 1130fa9e4066Sahrens int drop_struct_lock = FALSE; 1131d3469faaSMark Maybee boolean_t do_free_accounting = B_FALSE; 1132fa9e4066Sahrens int txgoff = tx->tx_txg & TXG_MASK; 1133fa9e4066Sahrens 1134fa9e4066Sahrens ASSERT(tx->tx_txg != 0); 1135fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 11369c9dc39aSek110237 DMU_TX_DIRTY_BUF(tx, db); 1137fa9e4066Sahrens 1138744947dcSTom Erickson DB_DNODE_ENTER(db); 1139744947dcSTom Erickson dn = DB_DNODE(db); 1140fa9e4066Sahrens /* 1141fa9e4066Sahrens * Shouldn't dirty a regular buffer in syncing context. Private 1142fa9e4066Sahrens * objects may be dirtied in syncing context, but only if they 1143fa9e4066Sahrens * were already pre-dirtied in open context. 1144fa9e4066Sahrens */ 1145c717a561Smaybee ASSERT(!dmu_tx_is_syncing(tx) || 1146c717a561Smaybee BP_IS_HOLE(dn->dn_objset->os_rootbp) || 114714843421SMatthew Ahrens DMU_OBJECT_IS_SPECIAL(dn->dn_object) || 114814843421SMatthew Ahrens dn->dn_objset->os_dsl_dataset == NULL); 1149fa9e4066Sahrens /* 1150fa9e4066Sahrens * We make this assert for private objects as well, but after we 1151fa9e4066Sahrens * check if we're already dirty. They are allowed to re-dirty 1152fa9e4066Sahrens * in syncing context. 1153fa9e4066Sahrens */ 1154ea8dc4b6Seschrock ASSERT(dn->dn_object == DMU_META_DNODE_OBJECT || 1155c717a561Smaybee dn->dn_dirtyctx == DN_UNDIRTIED || dn->dn_dirtyctx == 1156fa9e4066Sahrens (dmu_tx_is_syncing(tx) ? DN_DIRTY_SYNC : DN_DIRTY_OPEN)); 1157fa9e4066Sahrens 1158fa9e4066Sahrens mutex_enter(&db->db_mtx); 1159fa9e4066Sahrens /* 1160c717a561Smaybee * XXX make this true for indirects too? The problem is that 1161c717a561Smaybee * transactions created with dmu_tx_create_assigned() from 1162c717a561Smaybee * syncing context don't bother holding ahead. 1163fa9e4066Sahrens */ 1164c717a561Smaybee ASSERT(db->db_level != 0 || 116582c9918fSTim Haley db->db_state == DB_CACHED || db->db_state == DB_FILL || 116682c9918fSTim Haley db->db_state == DB_NOFILL); 1167fa9e4066Sahrens 1168fa9e4066Sahrens mutex_enter(&dn->dn_mtx); 1169fa9e4066Sahrens /* 1170fa9e4066Sahrens * Don't set dirtyctx to SYNC if we're just modifying this as we 1171fa9e4066Sahrens * initialize the objset. 1172fa9e4066Sahrens */ 1173fa9e4066Sahrens if (dn->dn_dirtyctx == DN_UNDIRTIED && 1174c717a561Smaybee !BP_IS_HOLE(dn->dn_objset->os_rootbp)) { 1175fa9e4066Sahrens dn->dn_dirtyctx = 1176fa9e4066Sahrens (dmu_tx_is_syncing(tx) ? DN_DIRTY_SYNC : DN_DIRTY_OPEN); 1177fa9e4066Sahrens ASSERT(dn->dn_dirtyctx_firstset == NULL); 1178fa9e4066Sahrens dn->dn_dirtyctx_firstset = kmem_alloc(1, KM_SLEEP); 1179fa9e4066Sahrens } 1180fa9e4066Sahrens mutex_exit(&dn->dn_mtx); 1181fa9e4066Sahrens 11820a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) 11830a586ceaSMark Shellenbaum dn->dn_have_spill = B_TRUE; 11840a586ceaSMark Shellenbaum 1185fa9e4066Sahrens /* 1186fa9e4066Sahrens * If this buffer is already dirty, we're done. 1187fa9e4066Sahrens */ 1188c717a561Smaybee drp = &db->db_last_dirty; 1189c717a561Smaybee ASSERT(*drp == NULL || (*drp)->dr_txg <= tx->tx_txg || 1190c717a561Smaybee db->db.db_object == DMU_META_DNODE_OBJECT); 11917e2186e3Sbonwick while ((dr = *drp) != NULL && dr->dr_txg > tx->tx_txg) 11927e2186e3Sbonwick drp = &dr->dr_next; 11937e2186e3Sbonwick if (dr && dr->dr_txg == tx->tx_txg) { 1194744947dcSTom Erickson DB_DNODE_EXIT(db); 1195744947dcSTom Erickson 11960a586ceaSMark Shellenbaum if (db->db_level == 0 && db->db_blkid != DMU_BONUS_BLKID) { 1197c717a561Smaybee /* 1198c717a561Smaybee * If this buffer has already been written out, 1199c717a561Smaybee * we now need to reset its state. 1200c717a561Smaybee */ 12017e2186e3Sbonwick dbuf_unoverride(dr); 1202b24ab676SJeff Bonwick if (db->db.db_object != DMU_META_DNODE_OBJECT && 1203b24ab676SJeff Bonwick db->db_state != DB_NOFILL) 12046b4acc8bSahrens arc_buf_thaw(db->db_buf); 1205c717a561Smaybee } 1206fa9e4066Sahrens mutex_exit(&db->db_mtx); 12077e2186e3Sbonwick return (dr); 1208fa9e4066Sahrens } 1209fa9e4066Sahrens 1210fa9e4066Sahrens /* 1211fa9e4066Sahrens * Only valid if not already dirty. 1212fa9e4066Sahrens */ 121314843421SMatthew Ahrens ASSERT(dn->dn_object == 0 || 121414843421SMatthew Ahrens dn->dn_dirtyctx == DN_UNDIRTIED || dn->dn_dirtyctx == 1215fa9e4066Sahrens (dmu_tx_is_syncing(tx) ? DN_DIRTY_SYNC : DN_DIRTY_OPEN)); 1216fa9e4066Sahrens 1217fa9e4066Sahrens ASSERT3U(dn->dn_nlevels, >, db->db_level); 1218fa9e4066Sahrens ASSERT((dn->dn_phys->dn_nlevels == 0 && db->db_level == 0) || 1219fa9e4066Sahrens dn->dn_phys->dn_nlevels > db->db_level || 1220fa9e4066Sahrens dn->dn_next_nlevels[txgoff] > db->db_level || 1221fa9e4066Sahrens dn->dn_next_nlevels[(tx->tx_txg-1) & TXG_MASK] > db->db_level || 1222fa9e4066Sahrens dn->dn_next_nlevels[(tx->tx_txg-2) & TXG_MASK] > db->db_level); 1223fa9e4066Sahrens 1224fa9e4066Sahrens /* 1225fa9e4066Sahrens * We should only be dirtying in syncing context if it's the 122614843421SMatthew Ahrens * mos or we're initializing the os or it's a special object. 122714843421SMatthew Ahrens * However, we are allowed to dirty in syncing context provided 122814843421SMatthew Ahrens * we already dirtied it in open context. Hence we must make 122914843421SMatthew Ahrens * this assertion only if we're not already dirty. 1230fa9e4066Sahrens */ 1231744947dcSTom Erickson os = dn->dn_objset; 123214843421SMatthew Ahrens ASSERT(!dmu_tx_is_syncing(tx) || DMU_OBJECT_IS_SPECIAL(dn->dn_object) || 123314843421SMatthew Ahrens os->os_dsl_dataset == NULL || BP_IS_HOLE(os->os_rootbp)); 1234fa9e4066Sahrens ASSERT(db->db.db_size != 0); 1235fa9e4066Sahrens 1236fa9e4066Sahrens dprintf_dbuf(db, "size=%llx\n", (u_longlong_t)db->db.db_size); 1237fa9e4066Sahrens 12380a586ceaSMark Shellenbaum if (db->db_blkid != DMU_BONUS_BLKID) { 12391934e92fSmaybee /* 12401934e92fSmaybee * Update the accounting. 1241d3469faaSMark Maybee * Note: we delay "free accounting" until after we drop 1242d3469faaSMark Maybee * the db_mtx. This keeps us from grabbing other locks 1243b24ab676SJeff Bonwick * (and possibly deadlocking) in bp_get_dsize() while 1244d3469faaSMark Maybee * also holding the db_mtx. 12451934e92fSmaybee */ 12461934e92fSmaybee dnode_willuse_space(dn, db->db.db_size, tx); 1247d3469faaSMark Maybee do_free_accounting = dbuf_block_freeable(db); 12481934e92fSmaybee } 12491934e92fSmaybee 1250ea8dc4b6Seschrock /* 1251ea8dc4b6Seschrock * If this buffer is dirty in an old transaction group we need 1252ea8dc4b6Seschrock * to make a copy of it so that the changes we make in this 1253ea8dc4b6Seschrock * transaction group won't leak out when we sync the older txg. 1254ea8dc4b6Seschrock */ 1255c717a561Smaybee dr = kmem_zalloc(sizeof (dbuf_dirty_record_t), KM_SLEEP); 1256c717a561Smaybee if (db->db_level == 0) { 1257c717a561Smaybee void *data_old = db->db_buf; 1258c717a561Smaybee 125982c9918fSTim Haley if (db->db_state != DB_NOFILL) { 12600a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 1261c717a561Smaybee dbuf_fix_old_data(db, tx->tx_txg); 1262c717a561Smaybee data_old = db->db.db_data; 1263c717a561Smaybee } else if (db->db.db_object != DMU_META_DNODE_OBJECT) { 1264fa9e4066Sahrens /* 126582c9918fSTim Haley * Release the data buffer from the cache so 126682c9918fSTim Haley * that we can modify it without impacting 126782c9918fSTim Haley * possible other users of this cached data 126882c9918fSTim Haley * block. Note that indirect blocks and 126982c9918fSTim Haley * private objects are not released until the 127082c9918fSTim Haley * syncing state (since they are only modified 127182c9918fSTim Haley * then). 1272fa9e4066Sahrens */ 1273fa9e4066Sahrens arc_release(db->db_buf, db); 1274fa9e4066Sahrens dbuf_fix_old_data(db, tx->tx_txg); 1275c717a561Smaybee data_old = db->db_buf; 1276fa9e4066Sahrens } 1277c717a561Smaybee ASSERT(data_old != NULL); 127882c9918fSTim Haley } 1279c717a561Smaybee dr->dt.dl.dr_data = data_old; 1280c717a561Smaybee } else { 1281c717a561Smaybee mutex_init(&dr->dt.di.dr_mtx, NULL, MUTEX_DEFAULT, NULL); 1282c717a561Smaybee list_create(&dr->dt.di.dr_children, 1283c717a561Smaybee sizeof (dbuf_dirty_record_t), 1284c717a561Smaybee offsetof(dbuf_dirty_record_t, dr_dirty_node)); 1285fa9e4066Sahrens } 128669962b56SMatthew Ahrens if (db->db_blkid != DMU_BONUS_BLKID && os->os_dsl_dataset != NULL) 128769962b56SMatthew Ahrens dr->dr_accounted = db->db.db_size; 1288c717a561Smaybee dr->dr_dbuf = db; 1289c717a561Smaybee dr->dr_txg = tx->tx_txg; 1290c717a561Smaybee dr->dr_next = *drp; 1291c717a561Smaybee *drp = dr; 1292fa9e4066Sahrens 1293fa9e4066Sahrens /* 1294fa9e4066Sahrens * We could have been freed_in_flight between the dbuf_noread 1295fa9e4066Sahrens * and dbuf_dirty. We win, as though the dbuf_noread() had 1296fa9e4066Sahrens * happened after the free. 1297fa9e4066Sahrens */ 12980a586ceaSMark Shellenbaum if (db->db_level == 0 && db->db_blkid != DMU_BONUS_BLKID && 12990a586ceaSMark Shellenbaum db->db_blkid != DMU_SPILL_BLKID) { 1300c717a561Smaybee mutex_enter(&dn->dn_mtx); 1301bf16b11eSMatthew Ahrens if (dn->dn_free_ranges[txgoff] != NULL) { 1302bf16b11eSMatthew Ahrens range_tree_clear(dn->dn_free_ranges[txgoff], 1303bf16b11eSMatthew Ahrens db->db_blkid, 1); 1304bf16b11eSMatthew Ahrens } 1305fa9e4066Sahrens mutex_exit(&dn->dn_mtx); 1306c717a561Smaybee db->db_freed_in_flight = FALSE; 1307c717a561Smaybee } 1308fa9e4066Sahrens 1309fa9e4066Sahrens /* 1310fa9e4066Sahrens * This buffer is now part of this txg 1311fa9e4066Sahrens */ 1312fa9e4066Sahrens dbuf_add_ref(db, (void *)(uintptr_t)tx->tx_txg); 1313fa9e4066Sahrens db->db_dirtycnt += 1; 1314fa9e4066Sahrens ASSERT3U(db->db_dirtycnt, <=, 3); 1315fa9e4066Sahrens 1316fa9e4066Sahrens mutex_exit(&db->db_mtx); 1317fa9e4066Sahrens 13180a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID || 13190a586ceaSMark Shellenbaum db->db_blkid == DMU_SPILL_BLKID) { 1320c717a561Smaybee mutex_enter(&dn->dn_mtx); 1321c717a561Smaybee ASSERT(!list_link_active(&dr->dr_dirty_node)); 1322c717a561Smaybee list_insert_tail(&dn->dn_dirty_records[txgoff], dr); 1323c717a561Smaybee mutex_exit(&dn->dn_mtx); 1324fa9e4066Sahrens dnode_setdirty(dn, tx); 1325744947dcSTom Erickson DB_DNODE_EXIT(db); 1326c717a561Smaybee return (dr); 1327d3469faaSMark Maybee } else if (do_free_accounting) { 1328d3469faaSMark Maybee blkptr_t *bp = db->db_blkptr; 1329d3469faaSMark Maybee int64_t willfree = (bp && !BP_IS_HOLE(bp)) ? 1330b24ab676SJeff Bonwick bp_get_dsize(os->os_spa, bp) : db->db.db_size; 1331d3469faaSMark Maybee /* 1332d3469faaSMark Maybee * This is only a guess -- if the dbuf is dirty 1333d3469faaSMark Maybee * in a previous txg, we don't know how much 1334d3469faaSMark Maybee * space it will use on disk yet. We should 1335d3469faaSMark Maybee * really have the struct_rwlock to access 1336d3469faaSMark Maybee * db_blkptr, but since this is just a guess, 1337d3469faaSMark Maybee * it's OK if we get an odd answer. 1338d3469faaSMark Maybee */ 1339837b568bSGeorge Wilson ddt_prefetch(os->os_spa, bp); 1340d3469faaSMark Maybee dnode_willuse_space(dn, -willfree, tx); 1341fa9e4066Sahrens } 1342fa9e4066Sahrens 1343fa9e4066Sahrens if (!RW_WRITE_HELD(&dn->dn_struct_rwlock)) { 1344fa9e4066Sahrens rw_enter(&dn->dn_struct_rwlock, RW_READER); 1345fa9e4066Sahrens drop_struct_lock = TRUE; 1346fa9e4066Sahrens } 1347fa9e4066Sahrens 13488346f03fSJonathan W Adams if (db->db_level == 0) { 13498346f03fSJonathan W Adams dnode_new_blkid(dn, db->db_blkid, tx, drop_struct_lock); 13508346f03fSJonathan W Adams ASSERT(dn->dn_maxblkid >= db->db_blkid); 13518346f03fSJonathan W Adams } 13528346f03fSJonathan W Adams 135344eda4d7Smaybee if (db->db_level+1 < dn->dn_nlevels) { 1354c717a561Smaybee dmu_buf_impl_t *parent = db->db_parent; 1355c717a561Smaybee dbuf_dirty_record_t *di; 1356c717a561Smaybee int parent_held = FALSE; 1357c717a561Smaybee 1358c717a561Smaybee if (db->db_parent == NULL || db->db_parent == dn->dn_dbuf) { 1359fa9e4066Sahrens int epbs = dn->dn_indblkshift - SPA_BLKPTRSHIFT; 1360c717a561Smaybee 1361fa9e4066Sahrens parent = dbuf_hold_level(dn, db->db_level+1, 1362fa9e4066Sahrens db->db_blkid >> epbs, FTAG); 136301025c89SJohn Harres ASSERT(parent != NULL); 1364c717a561Smaybee parent_held = TRUE; 1365c717a561Smaybee } 1366fa9e4066Sahrens if (drop_struct_lock) 1367fa9e4066Sahrens rw_exit(&dn->dn_struct_rwlock); 1368c717a561Smaybee ASSERT3U(db->db_level+1, ==, parent->db_level); 1369c717a561Smaybee di = dbuf_dirty(parent, tx); 1370c717a561Smaybee if (parent_held) 1371ea8dc4b6Seschrock dbuf_rele(parent, FTAG); 1372c717a561Smaybee 1373c717a561Smaybee mutex_enter(&db->db_mtx); 137469962b56SMatthew Ahrens /* 137569962b56SMatthew Ahrens * Since we've dropped the mutex, it's possible that 137669962b56SMatthew Ahrens * dbuf_undirty() might have changed this out from under us. 137769962b56SMatthew Ahrens */ 1378c717a561Smaybee if (db->db_last_dirty == dr || 1379c717a561Smaybee dn->dn_object == DMU_META_DNODE_OBJECT) { 1380c717a561Smaybee mutex_enter(&di->dt.di.dr_mtx); 1381c717a561Smaybee ASSERT3U(di->dr_txg, ==, tx->tx_txg); 1382c717a561Smaybee ASSERT(!list_link_active(&dr->dr_dirty_node)); 1383c717a561Smaybee list_insert_tail(&di->dt.di.dr_children, dr); 1384c717a561Smaybee mutex_exit(&di->dt.di.dr_mtx); 1385c717a561Smaybee dr->dr_parent = di; 1386c717a561Smaybee } 1387c717a561Smaybee mutex_exit(&db->db_mtx); 1388fa9e4066Sahrens } else { 1389c717a561Smaybee ASSERT(db->db_level+1 == dn->dn_nlevels); 1390c717a561Smaybee ASSERT(db->db_blkid < dn->dn_nblkptr); 1391744947dcSTom Erickson ASSERT(db->db_parent == NULL || db->db_parent == dn->dn_dbuf); 1392c717a561Smaybee mutex_enter(&dn->dn_mtx); 1393c717a561Smaybee ASSERT(!list_link_active(&dr->dr_dirty_node)); 1394c717a561Smaybee list_insert_tail(&dn->dn_dirty_records[txgoff], dr); 1395c717a561Smaybee mutex_exit(&dn->dn_mtx); 1396fa9e4066Sahrens if (drop_struct_lock) 1397fa9e4066Sahrens rw_exit(&dn->dn_struct_rwlock); 1398fa9e4066Sahrens } 1399fa9e4066Sahrens 1400fa9e4066Sahrens dnode_setdirty(dn, tx); 1401744947dcSTom Erickson DB_DNODE_EXIT(db); 1402c717a561Smaybee return (dr); 1403fa9e4066Sahrens } 1404fa9e4066Sahrens 14053b2aab18SMatthew Ahrens /* 14063e30c24aSWill Andrews * Undirty a buffer in the transaction group referenced by the given 14073e30c24aSWill Andrews * transaction. Return whether this evicted the dbuf. 14083b2aab18SMatthew Ahrens */ 14093b2aab18SMatthew Ahrens static boolean_t 1410fa9e4066Sahrens dbuf_undirty(dmu_buf_impl_t *db, dmu_tx_t *tx) 1411fa9e4066Sahrens { 1412744947dcSTom Erickson dnode_t *dn; 1413c717a561Smaybee uint64_t txg = tx->tx_txg; 141417f17c2dSbonwick dbuf_dirty_record_t *dr, **drp; 1415fa9e4066Sahrens 1416c717a561Smaybee ASSERT(txg != 0); 141746e1baa6SMatthew Ahrens 141846e1baa6SMatthew Ahrens /* 141946e1baa6SMatthew Ahrens * Due to our use of dn_nlevels below, this can only be called 142046e1baa6SMatthew Ahrens * in open context, unless we are operating on the MOS. 142146e1baa6SMatthew Ahrens * From syncing context, dn_nlevels may be different from the 142246e1baa6SMatthew Ahrens * dn_nlevels used when dbuf was dirtied. 142346e1baa6SMatthew Ahrens */ 142446e1baa6SMatthew Ahrens ASSERT(db->db_objset == 142546e1baa6SMatthew Ahrens dmu_objset_pool(db->db_objset)->dp_meta_objset || 142646e1baa6SMatthew Ahrens txg != spa_syncing_txg(dmu_objset_spa(db->db_objset))); 14270a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 14283b2aab18SMatthew Ahrens ASSERT0(db->db_level); 14293b2aab18SMatthew Ahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 1430fa9e4066Sahrens 1431fa9e4066Sahrens /* 1432fa9e4066Sahrens * If this buffer is not dirty, we're done. 1433fa9e4066Sahrens */ 143417f17c2dSbonwick for (drp = &db->db_last_dirty; (dr = *drp) != NULL; drp = &dr->dr_next) 1435c717a561Smaybee if (dr->dr_txg <= txg) 1436c717a561Smaybee break; 14373b2aab18SMatthew Ahrens if (dr == NULL || dr->dr_txg < txg) 14383b2aab18SMatthew Ahrens return (B_FALSE); 1439c717a561Smaybee ASSERT(dr->dr_txg == txg); 1440b24ab676SJeff Bonwick ASSERT(dr->dr_dbuf == db); 1441fa9e4066Sahrens 1442744947dcSTom Erickson DB_DNODE_ENTER(db); 1443744947dcSTom Erickson dn = DB_DNODE(db); 1444744947dcSTom Erickson 1445fa9e4066Sahrens dprintf_dbuf(db, "size=%llx\n", (u_longlong_t)db->db.db_size); 1446fa9e4066Sahrens 1447fa9e4066Sahrens ASSERT(db->db.db_size != 0); 1448fa9e4066Sahrens 144946e1baa6SMatthew Ahrens dsl_pool_undirty_space(dmu_objset_pool(dn->dn_objset), 145046e1baa6SMatthew Ahrens dr->dr_accounted, txg); 1451fa9e4066Sahrens 145217f17c2dSbonwick *drp = dr->dr_next; 1453c717a561Smaybee 14543f2366c2SGordon Ross /* 14553f2366c2SGordon Ross * Note that there are three places in dbuf_dirty() 14563f2366c2SGordon Ross * where this dirty record may be put on a list. 14573f2366c2SGordon Ross * Make sure to do a list_remove corresponding to 14583f2366c2SGordon Ross * every one of those list_insert calls. 14593f2366c2SGordon Ross */ 1460c717a561Smaybee if (dr->dr_parent) { 1461c717a561Smaybee mutex_enter(&dr->dr_parent->dt.di.dr_mtx); 1462c717a561Smaybee list_remove(&dr->dr_parent->dt.di.dr_children, dr); 1463c717a561Smaybee mutex_exit(&dr->dr_parent->dt.di.dr_mtx); 14643f2366c2SGordon Ross } else if (db->db_blkid == DMU_SPILL_BLKID || 14653f2366c2SGordon Ross db->db_level + 1 == dn->dn_nlevels) { 1466cdb0ab79Smaybee ASSERT(db->db_blkptr == NULL || db->db_parent == dn->dn_dbuf); 1467fa9e4066Sahrens mutex_enter(&dn->dn_mtx); 1468c717a561Smaybee list_remove(&dn->dn_dirty_records[txg & TXG_MASK], dr); 1469fa9e4066Sahrens mutex_exit(&dn->dn_mtx); 1470c717a561Smaybee } 1471744947dcSTom Erickson DB_DNODE_EXIT(db); 1472c717a561Smaybee 147382c9918fSTim Haley if (db->db_state != DB_NOFILL) { 1474c717a561Smaybee dbuf_unoverride(dr); 1475c717a561Smaybee 1476c717a561Smaybee ASSERT(db->db_buf != NULL); 1477c717a561Smaybee ASSERT(dr->dt.dl.dr_data != NULL); 1478c717a561Smaybee if (dr->dt.dl.dr_data != db->db_buf) 14793b2aab18SMatthew Ahrens VERIFY(arc_buf_remove_ref(dr->dt.dl.dr_data, db)); 1480c717a561Smaybee } 1481d2b3cbbdSJorgen Lundman 1482c717a561Smaybee kmem_free(dr, sizeof (dbuf_dirty_record_t)); 1483fa9e4066Sahrens 1484fa9e4066Sahrens ASSERT(db->db_dirtycnt > 0); 1485fa9e4066Sahrens db->db_dirtycnt -= 1; 1486fa9e4066Sahrens 1487c717a561Smaybee if (refcount_remove(&db->db_holds, (void *)(uintptr_t)txg) == 0) { 1488ea8dc4b6Seschrock arc_buf_t *buf = db->db_buf; 1489fa9e4066Sahrens 1490b24ab676SJeff Bonwick ASSERT(db->db_state == DB_NOFILL || arc_released(buf)); 1491bc9014e6SJustin Gibbs dbuf_clear_data(db); 14923b2aab18SMatthew Ahrens VERIFY(arc_buf_remove_ref(buf, db)); 1493fa9e4066Sahrens dbuf_evict(db); 14943b2aab18SMatthew Ahrens return (B_TRUE); 1495fa9e4066Sahrens } 1496fa9e4066Sahrens 14973b2aab18SMatthew Ahrens return (B_FALSE); 1498fa9e4066Sahrens } 1499fa9e4066Sahrens 1500fa9e4066Sahrens void 150143466aaeSMax Grossman dmu_buf_will_dirty(dmu_buf_t *db_fake, dmu_tx_t *tx) 1502fa9e4066Sahrens { 150343466aaeSMax Grossman dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 15041ab7f2deSmaybee int rf = DB_RF_MUST_SUCCEED | DB_RF_NOPREFETCH; 1505fa9e4066Sahrens 1506fa9e4066Sahrens ASSERT(tx->tx_txg != 0); 1507fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 1508fa9e4066Sahrens 1509744947dcSTom Erickson DB_DNODE_ENTER(db); 1510744947dcSTom Erickson if (RW_WRITE_HELD(&DB_DNODE(db)->dn_struct_rwlock)) 1511fa9e4066Sahrens rf |= DB_RF_HAVESTRUCT; 1512744947dcSTom Erickson DB_DNODE_EXIT(db); 1513ea8dc4b6Seschrock (void) dbuf_read(db, NULL, rf); 1514c717a561Smaybee (void) dbuf_dirty(db, tx); 1515fa9e4066Sahrens } 1516fa9e4066Sahrens 1517fa9e4066Sahrens void 151882c9918fSTim Haley dmu_buf_will_not_fill(dmu_buf_t *db_fake, dmu_tx_t *tx) 151982c9918fSTim Haley { 152082c9918fSTim Haley dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 152182c9918fSTim Haley 152282c9918fSTim Haley db->db_state = DB_NOFILL; 152382c9918fSTim Haley 152482c9918fSTim Haley dmu_buf_will_fill(db_fake, tx); 152582c9918fSTim Haley } 152682c9918fSTim Haley 152782c9918fSTim Haley void 1528ea8dc4b6Seschrock dmu_buf_will_fill(dmu_buf_t *db_fake, dmu_tx_t *tx) 1529fa9e4066Sahrens { 1530ea8dc4b6Seschrock dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 1531ea8dc4b6Seschrock 15320a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 1533fa9e4066Sahrens ASSERT(tx->tx_txg != 0); 1534fa9e4066Sahrens ASSERT(db->db_level == 0); 1535fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 1536fa9e4066Sahrens 1537ea8dc4b6Seschrock ASSERT(db->db.db_object != DMU_META_DNODE_OBJECT || 1538fa9e4066Sahrens dmu_tx_private_ok(tx)); 1539fa9e4066Sahrens 1540fa9e4066Sahrens dbuf_noread(db); 1541c717a561Smaybee (void) dbuf_dirty(db, tx); 1542fa9e4066Sahrens } 1543fa9e4066Sahrens 1544fa9e4066Sahrens #pragma weak dmu_buf_fill_done = dbuf_fill_done 1545fa9e4066Sahrens /* ARGSUSED */ 1546fa9e4066Sahrens void 1547fa9e4066Sahrens dbuf_fill_done(dmu_buf_impl_t *db, dmu_tx_t *tx) 1548fa9e4066Sahrens { 1549fa9e4066Sahrens mutex_enter(&db->db_mtx); 15509c9dc39aSek110237 DBUF_VERIFY(db); 1551fa9e4066Sahrens 1552fa9e4066Sahrens if (db->db_state == DB_FILL) { 1553c717a561Smaybee if (db->db_level == 0 && db->db_freed_in_flight) { 15540a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 1555fa9e4066Sahrens /* we were freed while filling */ 1556fa9e4066Sahrens /* XXX dbuf_undirty? */ 1557fa9e4066Sahrens bzero(db->db.db_data, db->db.db_size); 1558c717a561Smaybee db->db_freed_in_flight = FALSE; 1559fa9e4066Sahrens } 1560fa9e4066Sahrens db->db_state = DB_CACHED; 1561fa9e4066Sahrens cv_broadcast(&db->db_changed); 1562fa9e4066Sahrens } 1563fa9e4066Sahrens mutex_exit(&db->db_mtx); 1564fa9e4066Sahrens } 1565fa9e4066Sahrens 15665d7b4d43SMatthew Ahrens void 15675d7b4d43SMatthew Ahrens dmu_buf_write_embedded(dmu_buf_t *dbuf, void *data, 15685d7b4d43SMatthew Ahrens bp_embedded_type_t etype, enum zio_compress comp, 15695d7b4d43SMatthew Ahrens int uncompressed_size, int compressed_size, int byteorder, 15705d7b4d43SMatthew Ahrens dmu_tx_t *tx) 15715d7b4d43SMatthew Ahrens { 15725d7b4d43SMatthew Ahrens dmu_buf_impl_t *db = (dmu_buf_impl_t *)dbuf; 15735d7b4d43SMatthew Ahrens struct dirty_leaf *dl; 15745d7b4d43SMatthew Ahrens dmu_object_type_t type; 15755d7b4d43SMatthew Ahrens 1576*ca0cc391SMatthew Ahrens if (etype == BP_EMBEDDED_TYPE_DATA) { 1577*ca0cc391SMatthew Ahrens ASSERT(spa_feature_is_active(dmu_objset_spa(db->db_objset), 1578*ca0cc391SMatthew Ahrens SPA_FEATURE_EMBEDDED_DATA)); 1579*ca0cc391SMatthew Ahrens } 1580*ca0cc391SMatthew Ahrens 15815d7b4d43SMatthew Ahrens DB_DNODE_ENTER(db); 15825d7b4d43SMatthew Ahrens type = DB_DNODE(db)->dn_type; 15835d7b4d43SMatthew Ahrens DB_DNODE_EXIT(db); 15845d7b4d43SMatthew Ahrens 15855d7b4d43SMatthew Ahrens ASSERT0(db->db_level); 15865d7b4d43SMatthew Ahrens ASSERT(db->db_blkid != DMU_BONUS_BLKID); 15875d7b4d43SMatthew Ahrens 15885d7b4d43SMatthew Ahrens dmu_buf_will_not_fill(dbuf, tx); 15895d7b4d43SMatthew Ahrens 15905d7b4d43SMatthew Ahrens ASSERT3U(db->db_last_dirty->dr_txg, ==, tx->tx_txg); 15915d7b4d43SMatthew Ahrens dl = &db->db_last_dirty->dt.dl; 15925d7b4d43SMatthew Ahrens encode_embedded_bp_compressed(&dl->dr_overridden_by, 15935d7b4d43SMatthew Ahrens data, comp, uncompressed_size, compressed_size); 15945d7b4d43SMatthew Ahrens BPE_SET_ETYPE(&dl->dr_overridden_by, etype); 15955d7b4d43SMatthew Ahrens BP_SET_TYPE(&dl->dr_overridden_by, type); 15965d7b4d43SMatthew Ahrens BP_SET_LEVEL(&dl->dr_overridden_by, 0); 15975d7b4d43SMatthew Ahrens BP_SET_BYTEORDER(&dl->dr_overridden_by, byteorder); 15985d7b4d43SMatthew Ahrens 15995d7b4d43SMatthew Ahrens dl->dr_override_state = DR_OVERRIDDEN; 16005d7b4d43SMatthew Ahrens dl->dr_overridden_by.blk_birth = db->db_last_dirty->dr_txg; 16015d7b4d43SMatthew Ahrens } 16025d7b4d43SMatthew Ahrens 1603ea8dc4b6Seschrock /* 16042fdbea25SAleksandr Guzovskiy * Directly assign a provided arc buf to a given dbuf if it's not referenced 16052fdbea25SAleksandr Guzovskiy * by anybody except our caller. Otherwise copy arcbuf's contents to dbuf. 16062fdbea25SAleksandr Guzovskiy */ 16072fdbea25SAleksandr Guzovskiy void 16082fdbea25SAleksandr Guzovskiy dbuf_assign_arcbuf(dmu_buf_impl_t *db, arc_buf_t *buf, dmu_tx_t *tx) 16092fdbea25SAleksandr Guzovskiy { 16102fdbea25SAleksandr Guzovskiy ASSERT(!refcount_is_zero(&db->db_holds)); 16110a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 16122fdbea25SAleksandr Guzovskiy ASSERT(db->db_level == 0); 16132fdbea25SAleksandr Guzovskiy ASSERT(DBUF_GET_BUFC_TYPE(db) == ARC_BUFC_DATA); 16142fdbea25SAleksandr Guzovskiy ASSERT(buf != NULL); 16152fdbea25SAleksandr Guzovskiy ASSERT(arc_buf_size(buf) == db->db.db_size); 16162fdbea25SAleksandr Guzovskiy ASSERT(tx->tx_txg != 0); 16172fdbea25SAleksandr Guzovskiy 16182fdbea25SAleksandr Guzovskiy arc_return_buf(buf, db); 16192fdbea25SAleksandr Guzovskiy ASSERT(arc_released(buf)); 16202fdbea25SAleksandr Guzovskiy 16212fdbea25SAleksandr Guzovskiy mutex_enter(&db->db_mtx); 16222fdbea25SAleksandr Guzovskiy 16232fdbea25SAleksandr Guzovskiy while (db->db_state == DB_READ || db->db_state == DB_FILL) 16242fdbea25SAleksandr Guzovskiy cv_wait(&db->db_changed, &db->db_mtx); 16252fdbea25SAleksandr Guzovskiy 16262fdbea25SAleksandr Guzovskiy ASSERT(db->db_state == DB_CACHED || db->db_state == DB_UNCACHED); 16272fdbea25SAleksandr Guzovskiy 16282fdbea25SAleksandr Guzovskiy if (db->db_state == DB_CACHED && 16292fdbea25SAleksandr Guzovskiy refcount_count(&db->db_holds) - 1 > db->db_dirtycnt) { 16302fdbea25SAleksandr Guzovskiy mutex_exit(&db->db_mtx); 16312fdbea25SAleksandr Guzovskiy (void) dbuf_dirty(db, tx); 16322fdbea25SAleksandr Guzovskiy bcopy(buf->b_data, db->db.db_data, db->db.db_size); 16333b2aab18SMatthew Ahrens VERIFY(arc_buf_remove_ref(buf, db)); 1634c242f9a0Schunli zhang - Sun Microsystems - Irvine United States xuio_stat_wbuf_copied(); 16352fdbea25SAleksandr Guzovskiy return; 16362fdbea25SAleksandr Guzovskiy } 16372fdbea25SAleksandr Guzovskiy 1638c242f9a0Schunli zhang - Sun Microsystems - Irvine United States xuio_stat_wbuf_nocopy(); 16392fdbea25SAleksandr Guzovskiy if (db->db_state == DB_CACHED) { 16402fdbea25SAleksandr Guzovskiy dbuf_dirty_record_t *dr = db->db_last_dirty; 16412fdbea25SAleksandr Guzovskiy 16422fdbea25SAleksandr Guzovskiy ASSERT(db->db_buf != NULL); 16432fdbea25SAleksandr Guzovskiy if (dr != NULL && dr->dr_txg == tx->tx_txg) { 16442fdbea25SAleksandr Guzovskiy ASSERT(dr->dt.dl.dr_data == db->db_buf); 16452fdbea25SAleksandr Guzovskiy if (!arc_released(db->db_buf)) { 16462fdbea25SAleksandr Guzovskiy ASSERT(dr->dt.dl.dr_override_state == 16472fdbea25SAleksandr Guzovskiy DR_OVERRIDDEN); 16482fdbea25SAleksandr Guzovskiy arc_release(db->db_buf, db); 16492fdbea25SAleksandr Guzovskiy } 16502fdbea25SAleksandr Guzovskiy dr->dt.dl.dr_data = buf; 16513b2aab18SMatthew Ahrens VERIFY(arc_buf_remove_ref(db->db_buf, db)); 16522fdbea25SAleksandr Guzovskiy } else if (dr == NULL || dr->dt.dl.dr_data != db->db_buf) { 16532fdbea25SAleksandr Guzovskiy arc_release(db->db_buf, db); 16543b2aab18SMatthew Ahrens VERIFY(arc_buf_remove_ref(db->db_buf, db)); 16552fdbea25SAleksandr Guzovskiy } 16562fdbea25SAleksandr Guzovskiy db->db_buf = NULL; 16572fdbea25SAleksandr Guzovskiy } 16582fdbea25SAleksandr Guzovskiy ASSERT(db->db_buf == NULL); 16592fdbea25SAleksandr Guzovskiy dbuf_set_data(db, buf); 16602fdbea25SAleksandr Guzovskiy db->db_state = DB_FILL; 16612fdbea25SAleksandr Guzovskiy mutex_exit(&db->db_mtx); 16622fdbea25SAleksandr Guzovskiy (void) dbuf_dirty(db, tx); 166343466aaeSMax Grossman dmu_buf_fill_done(&db->db, tx); 16642fdbea25SAleksandr Guzovskiy } 16652fdbea25SAleksandr Guzovskiy 16662fdbea25SAleksandr Guzovskiy /* 1667ea8dc4b6Seschrock * "Clear" the contents of this dbuf. This will mark the dbuf 166869962b56SMatthew Ahrens * EVICTING and clear *most* of its references. Unfortunately, 1669ea8dc4b6Seschrock * when we are not holding the dn_dbufs_mtx, we can't clear the 1670ea8dc4b6Seschrock * entry in the dn_dbufs list. We have to wait until dbuf_destroy() 1671ea8dc4b6Seschrock * in this case. For callers from the DMU we will usually see: 1672bbfa8ea8SMatthew Ahrens * dbuf_clear()->arc_clear_callback()->dbuf_do_evict()->dbuf_destroy() 1673ea8dc4b6Seschrock * For the arc callback, we will usually see: 1674ea8dc4b6Seschrock * dbuf_do_evict()->dbuf_clear();dbuf_destroy() 1675ea8dc4b6Seschrock * Sometimes, though, we will get a mix of these two: 1676bbfa8ea8SMatthew Ahrens * DMU: dbuf_clear()->arc_clear_callback() 1677ea8dc4b6Seschrock * ARC: dbuf_do_evict()->dbuf_destroy() 1678bbfa8ea8SMatthew Ahrens * 1679bbfa8ea8SMatthew Ahrens * This routine will dissociate the dbuf from the arc, by calling 1680bbfa8ea8SMatthew Ahrens * arc_clear_callback(), but will not evict the data from the ARC. 1681ea8dc4b6Seschrock */ 1682ea8dc4b6Seschrock void 1683fa9e4066Sahrens dbuf_clear(dmu_buf_impl_t *db) 1684fa9e4066Sahrens { 1685744947dcSTom Erickson dnode_t *dn; 1686ea8dc4b6Seschrock dmu_buf_impl_t *parent = db->db_parent; 1687744947dcSTom Erickson dmu_buf_impl_t *dndb; 1688bbfa8ea8SMatthew Ahrens boolean_t dbuf_gone = B_FALSE; 1689fa9e4066Sahrens 1690fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 1691fa9e4066Sahrens ASSERT(refcount_is_zero(&db->db_holds)); 1692fa9e4066Sahrens 1693ea8dc4b6Seschrock dbuf_evict_user(db); 1694ea8dc4b6Seschrock 1695fa9e4066Sahrens if (db->db_state == DB_CACHED) { 1696ea8dc4b6Seschrock ASSERT(db->db.db_data != NULL); 16970a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 1698ea8dc4b6Seschrock zio_buf_free(db->db.db_data, DN_MAX_BONUSLEN); 16995a98e54bSBrendan Gregg - Sun Microsystems arc_space_return(DN_MAX_BONUSLEN, ARC_SPACE_OTHER); 17000e8c6158Smaybee } 1701fa9e4066Sahrens db->db.db_data = NULL; 1702fa9e4066Sahrens db->db_state = DB_UNCACHED; 1703fa9e4066Sahrens } 1704fa9e4066Sahrens 170582c9918fSTim Haley ASSERT(db->db_state == DB_UNCACHED || db->db_state == DB_NOFILL); 1706fa9e4066Sahrens ASSERT(db->db_data_pending == NULL); 1707fa9e4066Sahrens 1708ea8dc4b6Seschrock db->db_state = DB_EVICTING; 1709ea8dc4b6Seschrock db->db_blkptr = NULL; 1710ea8dc4b6Seschrock 1711744947dcSTom Erickson DB_DNODE_ENTER(db); 1712744947dcSTom Erickson dn = DB_DNODE(db); 1713744947dcSTom Erickson dndb = dn->dn_dbuf; 17140a586ceaSMark Shellenbaum if (db->db_blkid != DMU_BONUS_BLKID && MUTEX_HELD(&dn->dn_dbufs_mtx)) { 17150f6d88adSAlex Reece avl_remove(&dn->dn_dbufs, db); 1716640c1670SJosef 'Jeff' Sipek atomic_dec_32(&dn->dn_dbufs_count); 1717744947dcSTom Erickson membar_producer(); 1718744947dcSTom Erickson DB_DNODE_EXIT(db); 1719744947dcSTom Erickson /* 1720744947dcSTom Erickson * Decrementing the dbuf count means that the hold corresponding 1721744947dcSTom Erickson * to the removed dbuf is no longer discounted in dnode_move(), 1722744947dcSTom Erickson * so the dnode cannot be moved until after we release the hold. 1723744947dcSTom Erickson * The membar_producer() ensures visibility of the decremented 1724744947dcSTom Erickson * value in dnode_move(), since DB_DNODE_EXIT doesn't actually 1725744947dcSTom Erickson * release any lock. 1726744947dcSTom Erickson */ 1727ea8dc4b6Seschrock dnode_rele(dn, db); 1728744947dcSTom Erickson db->db_dnode_handle = NULL; 1729744947dcSTom Erickson } else { 1730744947dcSTom Erickson DB_DNODE_EXIT(db); 1731ea8dc4b6Seschrock } 1732ea8dc4b6Seschrock 1733ea8dc4b6Seschrock if (db->db_buf) 1734bbfa8ea8SMatthew Ahrens dbuf_gone = arc_clear_callback(db->db_buf); 1735ea8dc4b6Seschrock 1736ea8dc4b6Seschrock if (!dbuf_gone) 1737fa9e4066Sahrens mutex_exit(&db->db_mtx); 1738fa9e4066Sahrens 1739fa9e4066Sahrens /* 1740744947dcSTom Erickson * If this dbuf is referenced from an indirect dbuf, 1741fa9e4066Sahrens * decrement the ref count on the indirect dbuf. 1742fa9e4066Sahrens */ 1743c543ec06Sahrens if (parent && parent != dndb) 1744ea8dc4b6Seschrock dbuf_rele(parent, db); 1745fa9e4066Sahrens } 1746fa9e4066Sahrens 1747a2cdcdd2SPaul Dagnelie /* 1748a2cdcdd2SPaul Dagnelie * Note: While bpp will always be updated if the function returns success, 1749a2cdcdd2SPaul Dagnelie * parentp will not be updated if the dnode does not have dn_dbuf filled in; 1750a2cdcdd2SPaul Dagnelie * this happens when the dnode is the meta-dnode, or a userused or groupused 1751a2cdcdd2SPaul Dagnelie * object. 1752a2cdcdd2SPaul Dagnelie */ 1753fa9e4066Sahrens static int 1754fa9e4066Sahrens dbuf_findbp(dnode_t *dn, int level, uint64_t blkid, int fail_sparse, 1755fa9e4066Sahrens dmu_buf_impl_t **parentp, blkptr_t **bpp) 1756fa9e4066Sahrens { 1757fa9e4066Sahrens int nlevels, epbs; 1758fa9e4066Sahrens 17590b69c2f0Sahrens *parentp = NULL; 17600b69c2f0Sahrens *bpp = NULL; 17610b69c2f0Sahrens 17620a586ceaSMark Shellenbaum ASSERT(blkid != DMU_BONUS_BLKID); 17630a586ceaSMark Shellenbaum 17640a586ceaSMark Shellenbaum if (blkid == DMU_SPILL_BLKID) { 17650a586ceaSMark Shellenbaum mutex_enter(&dn->dn_mtx); 176606e0070dSMark Shellenbaum if (dn->dn_have_spill && 176706e0070dSMark Shellenbaum (dn->dn_phys->dn_flags & DNODE_FLAG_SPILL_BLKPTR)) 17680a586ceaSMark Shellenbaum *bpp = &dn->dn_phys->dn_spill; 17690a586ceaSMark Shellenbaum else 17700a586ceaSMark Shellenbaum *bpp = NULL; 17710a586ceaSMark Shellenbaum dbuf_add_ref(dn->dn_dbuf, NULL); 17720a586ceaSMark Shellenbaum *parentp = dn->dn_dbuf; 17730a586ceaSMark Shellenbaum mutex_exit(&dn->dn_mtx); 17740a586ceaSMark Shellenbaum return (0); 17750a586ceaSMark Shellenbaum } 1776ea8dc4b6Seschrock 1777fa9e4066Sahrens if (dn->dn_phys->dn_nlevels == 0) 1778fa9e4066Sahrens nlevels = 1; 1779fa9e4066Sahrens else 1780fa9e4066Sahrens nlevels = dn->dn_phys->dn_nlevels; 1781fa9e4066Sahrens 1782fa9e4066Sahrens epbs = dn->dn_indblkshift - SPA_BLKPTRSHIFT; 1783fa9e4066Sahrens 1784fa9e4066Sahrens ASSERT3U(level * epbs, <, 64); 1785fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 1786ea8dc4b6Seschrock if (level >= nlevels || 1787fa9e4066Sahrens (blkid > (dn->dn_phys->dn_maxblkid >> (level * epbs)))) { 1788fa9e4066Sahrens /* the buffer has no parent yet */ 1789be6fd75aSMatthew Ahrens return (SET_ERROR(ENOENT)); 1790fa9e4066Sahrens } else if (level < nlevels-1) { 1791fa9e4066Sahrens /* this block is referenced from an indirect block */ 1792fa9e4066Sahrens int err = dbuf_hold_impl(dn, level+1, 1793a2cdcdd2SPaul Dagnelie blkid >> epbs, fail_sparse, FALSE, NULL, parentp); 1794fa9e4066Sahrens if (err) 1795fa9e4066Sahrens return (err); 1796ea8dc4b6Seschrock err = dbuf_read(*parentp, NULL, 1797ea8dc4b6Seschrock (DB_RF_HAVESTRUCT | DB_RF_NOPREFETCH | DB_RF_CANFAIL)); 1798c543ec06Sahrens if (err) { 1799c543ec06Sahrens dbuf_rele(*parentp, NULL); 1800c543ec06Sahrens *parentp = NULL; 1801c543ec06Sahrens return (err); 1802c543ec06Sahrens } 1803fa9e4066Sahrens *bpp = ((blkptr_t *)(*parentp)->db.db_data) + 1804fa9e4066Sahrens (blkid & ((1ULL << epbs) - 1)); 1805c543ec06Sahrens return (0); 1806fa9e4066Sahrens } else { 1807fa9e4066Sahrens /* the block is referenced from the dnode */ 1808fa9e4066Sahrens ASSERT3U(level, ==, nlevels-1); 1809fa9e4066Sahrens ASSERT(dn->dn_phys->dn_nblkptr == 0 || 1810fa9e4066Sahrens blkid < dn->dn_phys->dn_nblkptr); 1811c543ec06Sahrens if (dn->dn_dbuf) { 1812c543ec06Sahrens dbuf_add_ref(dn->dn_dbuf, NULL); 1813fa9e4066Sahrens *parentp = dn->dn_dbuf; 1814c543ec06Sahrens } 1815fa9e4066Sahrens *bpp = &dn->dn_phys->dn_blkptr[blkid]; 1816fa9e4066Sahrens return (0); 1817fa9e4066Sahrens } 1818fa9e4066Sahrens } 1819fa9e4066Sahrens 1820fa9e4066Sahrens static dmu_buf_impl_t * 1821fa9e4066Sahrens dbuf_create(dnode_t *dn, uint8_t level, uint64_t blkid, 1822fa9e4066Sahrens dmu_buf_impl_t *parent, blkptr_t *blkptr) 1823fa9e4066Sahrens { 1824503ad85cSMatthew Ahrens objset_t *os = dn->dn_objset; 1825fa9e4066Sahrens dmu_buf_impl_t *db, *odb; 1826fa9e4066Sahrens 1827fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 1828fa9e4066Sahrens ASSERT(dn->dn_type != DMU_OT_NONE); 1829fa9e4066Sahrens 1830fa9e4066Sahrens db = kmem_cache_alloc(dbuf_cache, KM_SLEEP); 1831fa9e4066Sahrens 1832fa9e4066Sahrens db->db_objset = os; 1833fa9e4066Sahrens db->db.db_object = dn->dn_object; 1834fa9e4066Sahrens db->db_level = level; 1835fa9e4066Sahrens db->db_blkid = blkid; 1836c717a561Smaybee db->db_last_dirty = NULL; 1837ea8dc4b6Seschrock db->db_dirtycnt = 0; 1838744947dcSTom Erickson db->db_dnode_handle = dn->dn_handle; 1839ea8dc4b6Seschrock db->db_parent = parent; 1840ea8dc4b6Seschrock db->db_blkptr = blkptr; 1841fa9e4066Sahrens 1842bc9014e6SJustin Gibbs db->db_user = NULL; 1843c717a561Smaybee db->db_immediate_evict = 0; 1844c717a561Smaybee db->db_freed_in_flight = 0; 1845ea8dc4b6Seschrock 18460a586ceaSMark Shellenbaum if (blkid == DMU_BONUS_BLKID) { 1847ea8dc4b6Seschrock ASSERT3P(parent, ==, dn->dn_dbuf); 18481934e92fSmaybee db->db.db_size = DN_MAX_BONUSLEN - 18491934e92fSmaybee (dn->dn_nblkptr-1) * sizeof (blkptr_t); 18501934e92fSmaybee ASSERT3U(db->db.db_size, >=, dn->dn_bonuslen); 18510a586ceaSMark Shellenbaum db->db.db_offset = DMU_BONUS_BLKID; 1852ea8dc4b6Seschrock db->db_state = DB_UNCACHED; 1853ea8dc4b6Seschrock /* the bonus dbuf is not placed in the hash table */ 18545a98e54bSBrendan Gregg - Sun Microsystems arc_space_consume(sizeof (dmu_buf_impl_t), ARC_SPACE_OTHER); 1855ea8dc4b6Seschrock return (db); 18560a586ceaSMark Shellenbaum } else if (blkid == DMU_SPILL_BLKID) { 18570a586ceaSMark Shellenbaum db->db.db_size = (blkptr != NULL) ? 18580a586ceaSMark Shellenbaum BP_GET_LSIZE(blkptr) : SPA_MINBLOCKSIZE; 18590a586ceaSMark Shellenbaum db->db.db_offset = 0; 1860fa9e4066Sahrens } else { 1861fa9e4066Sahrens int blocksize = 1862fa9e4066Sahrens db->db_level ? 1 << dn->dn_indblkshift : dn->dn_datablksz; 1863fa9e4066Sahrens db->db.db_size = blocksize; 1864fa9e4066Sahrens db->db.db_offset = db->db_blkid * blocksize; 1865fa9e4066Sahrens } 1866fa9e4066Sahrens 1867fa9e4066Sahrens /* 1868fa9e4066Sahrens * Hold the dn_dbufs_mtx while we get the new dbuf 1869fa9e4066Sahrens * in the hash table *and* added to the dbufs list. 1870fa9e4066Sahrens * This prevents a possible deadlock with someone 1871fa9e4066Sahrens * trying to look up this dbuf before its added to the 1872fa9e4066Sahrens * dn_dbufs list. 1873fa9e4066Sahrens */ 1874fa9e4066Sahrens mutex_enter(&dn->dn_dbufs_mtx); 1875ea8dc4b6Seschrock db->db_state = DB_EVICTING; 1876fa9e4066Sahrens if ((odb = dbuf_hash_insert(db)) != NULL) { 1877fa9e4066Sahrens /* someone else inserted it first */ 1878fa9e4066Sahrens kmem_cache_free(dbuf_cache, db); 1879fa9e4066Sahrens mutex_exit(&dn->dn_dbufs_mtx); 1880fa9e4066Sahrens return (odb); 1881fa9e4066Sahrens } 18820f6d88adSAlex Reece avl_add(&dn->dn_dbufs, db); 1883713d6c20SMatthew Ahrens if (db->db_level == 0 && db->db_blkid >= 1884713d6c20SMatthew Ahrens dn->dn_unlisted_l0_blkid) 1885713d6c20SMatthew Ahrens dn->dn_unlisted_l0_blkid = db->db_blkid + 1; 1886ea8dc4b6Seschrock db->db_state = DB_UNCACHED; 1887fa9e4066Sahrens mutex_exit(&dn->dn_dbufs_mtx); 18885a98e54bSBrendan Gregg - Sun Microsystems arc_space_consume(sizeof (dmu_buf_impl_t), ARC_SPACE_OTHER); 1889fa9e4066Sahrens 1890fa9e4066Sahrens if (parent && parent != dn->dn_dbuf) 1891fa9e4066Sahrens dbuf_add_ref(parent, db); 1892fa9e4066Sahrens 1893ea8dc4b6Seschrock ASSERT(dn->dn_object == DMU_META_DNODE_OBJECT || 1894ea8dc4b6Seschrock refcount_count(&dn->dn_holds) > 0); 1895fa9e4066Sahrens (void) refcount_add(&dn->dn_holds, db); 1896640c1670SJosef 'Jeff' Sipek atomic_inc_32(&dn->dn_dbufs_count); 1897fa9e4066Sahrens 1898fa9e4066Sahrens dprintf_dbuf(db, "db=%p\n", db); 1899fa9e4066Sahrens 1900fa9e4066Sahrens return (db); 1901fa9e4066Sahrens } 1902fa9e4066Sahrens 1903fa9e4066Sahrens static int 1904ea8dc4b6Seschrock dbuf_do_evict(void *private) 1905fa9e4066Sahrens { 1906bbfa8ea8SMatthew Ahrens dmu_buf_impl_t *db = private; 1907fa9e4066Sahrens 1908ea8dc4b6Seschrock if (!MUTEX_HELD(&db->db_mtx)) 1909ea8dc4b6Seschrock mutex_enter(&db->db_mtx); 1910ea8dc4b6Seschrock 1911ea8dc4b6Seschrock ASSERT(refcount_is_zero(&db->db_holds)); 1912ea8dc4b6Seschrock 1913ea8dc4b6Seschrock if (db->db_state != DB_EVICTING) { 1914ea8dc4b6Seschrock ASSERT(db->db_state == DB_CACHED); 19159c9dc39aSek110237 DBUF_VERIFY(db); 1916ea8dc4b6Seschrock db->db_buf = NULL; 1917ea8dc4b6Seschrock dbuf_evict(db); 1918ea8dc4b6Seschrock } else { 1919ea8dc4b6Seschrock mutex_exit(&db->db_mtx); 1920ea8dc4b6Seschrock dbuf_destroy(db); 1921fa9e4066Sahrens } 1922ea8dc4b6Seschrock return (0); 1923fa9e4066Sahrens } 1924fa9e4066Sahrens 1925fa9e4066Sahrens static void 1926fa9e4066Sahrens dbuf_destroy(dmu_buf_impl_t *db) 1927fa9e4066Sahrens { 1928fa9e4066Sahrens ASSERT(refcount_is_zero(&db->db_holds)); 1929fa9e4066Sahrens 19300a586ceaSMark Shellenbaum if (db->db_blkid != DMU_BONUS_BLKID) { 1931ea8dc4b6Seschrock /* 1932ea8dc4b6Seschrock * If this dbuf is still on the dn_dbufs list, 1933ea8dc4b6Seschrock * remove it from that list. 1934ea8dc4b6Seschrock */ 1935744947dcSTom Erickson if (db->db_dnode_handle != NULL) { 1936744947dcSTom Erickson dnode_t *dn; 19371934e92fSmaybee 1938744947dcSTom Erickson DB_DNODE_ENTER(db); 1939744947dcSTom Erickson dn = DB_DNODE(db); 19401934e92fSmaybee mutex_enter(&dn->dn_dbufs_mtx); 19410f6d88adSAlex Reece avl_remove(&dn->dn_dbufs, db); 1942640c1670SJosef 'Jeff' Sipek atomic_dec_32(&dn->dn_dbufs_count); 1943ea8dc4b6Seschrock mutex_exit(&dn->dn_dbufs_mtx); 1944744947dcSTom Erickson DB_DNODE_EXIT(db); 1945744947dcSTom Erickson /* 1946744947dcSTom Erickson * Decrementing the dbuf count means that the hold 1947744947dcSTom Erickson * corresponding to the removed dbuf is no longer 1948744947dcSTom Erickson * discounted in dnode_move(), so the dnode cannot be 1949744947dcSTom Erickson * moved until after we release the hold. 1950744947dcSTom Erickson */ 1951ea8dc4b6Seschrock dnode_rele(dn, db); 1952744947dcSTom Erickson db->db_dnode_handle = NULL; 1953ea8dc4b6Seschrock } 1954ea8dc4b6Seschrock dbuf_hash_remove(db); 1955ea8dc4b6Seschrock } 1956ea8dc4b6Seschrock db->db_parent = NULL; 1957ea8dc4b6Seschrock db->db_buf = NULL; 1958ea8dc4b6Seschrock 1959fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 1960fa9e4066Sahrens ASSERT(db->db_hash_next == NULL); 1961fa9e4066Sahrens ASSERT(db->db_blkptr == NULL); 1962fa9e4066Sahrens ASSERT(db->db_data_pending == NULL); 1963fa9e4066Sahrens 1964fa9e4066Sahrens kmem_cache_free(dbuf_cache, db); 19655a98e54bSBrendan Gregg - Sun Microsystems arc_space_return(sizeof (dmu_buf_impl_t), ARC_SPACE_OTHER); 1966fa9e4066Sahrens } 1967fa9e4066Sahrens 1968a2cdcdd2SPaul Dagnelie typedef struct dbuf_prefetch_arg { 1969a2cdcdd2SPaul Dagnelie spa_t *dpa_spa; /* The spa to issue the prefetch in. */ 1970a2cdcdd2SPaul Dagnelie zbookmark_phys_t dpa_zb; /* The target block to prefetch. */ 1971a2cdcdd2SPaul Dagnelie int dpa_epbs; /* Entries (blkptr_t's) Per Block Shift. */ 1972a2cdcdd2SPaul Dagnelie int dpa_curlevel; /* The current level that we're reading */ 1973a2cdcdd2SPaul Dagnelie zio_priority_t dpa_prio; /* The priority I/Os should be issued at. */ 1974a2cdcdd2SPaul Dagnelie zio_t *dpa_zio; /* The parent zio_t for all prefetches. */ 1975a2cdcdd2SPaul Dagnelie arc_flags_t dpa_aflags; /* Flags to pass to the final prefetch. */ 1976a2cdcdd2SPaul Dagnelie } dbuf_prefetch_arg_t; 1977a2cdcdd2SPaul Dagnelie 1978a2cdcdd2SPaul Dagnelie /* 1979a2cdcdd2SPaul Dagnelie * Actually issue the prefetch read for the block given. 1980a2cdcdd2SPaul Dagnelie */ 1981a2cdcdd2SPaul Dagnelie static void 1982a2cdcdd2SPaul Dagnelie dbuf_issue_final_prefetch(dbuf_prefetch_arg_t *dpa, blkptr_t *bp) 1983fa9e4066Sahrens { 1984a2cdcdd2SPaul Dagnelie if (BP_IS_HOLE(bp) || BP_IS_EMBEDDED(bp)) 1985a2cdcdd2SPaul Dagnelie return; 1986a2cdcdd2SPaul Dagnelie 1987a2cdcdd2SPaul Dagnelie arc_flags_t aflags = 1988a2cdcdd2SPaul Dagnelie dpa->dpa_aflags | ARC_FLAG_NOWAIT | ARC_FLAG_PREFETCH; 1989a2cdcdd2SPaul Dagnelie 1990a2cdcdd2SPaul Dagnelie ASSERT3U(dpa->dpa_curlevel, ==, BP_GET_LEVEL(bp)); 1991a2cdcdd2SPaul Dagnelie ASSERT3U(dpa->dpa_curlevel, ==, dpa->dpa_zb.zb_level); 1992a2cdcdd2SPaul Dagnelie ASSERT(dpa->dpa_zio != NULL); 1993a2cdcdd2SPaul Dagnelie (void) arc_read(dpa->dpa_zio, dpa->dpa_spa, bp, NULL, NULL, 1994a2cdcdd2SPaul Dagnelie dpa->dpa_prio, ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE, 1995a2cdcdd2SPaul Dagnelie &aflags, &dpa->dpa_zb); 1996a2cdcdd2SPaul Dagnelie } 1997a2cdcdd2SPaul Dagnelie 1998a2cdcdd2SPaul Dagnelie /* 1999a2cdcdd2SPaul Dagnelie * Called when an indirect block above our prefetch target is read in. This 2000a2cdcdd2SPaul Dagnelie * will either read in the next indirect block down the tree or issue the actual 2001a2cdcdd2SPaul Dagnelie * prefetch if the next block down is our target. 2002a2cdcdd2SPaul Dagnelie */ 2003a2cdcdd2SPaul Dagnelie static void 2004a2cdcdd2SPaul Dagnelie dbuf_prefetch_indirect_done(zio_t *zio, arc_buf_t *abuf, void *private) 2005a2cdcdd2SPaul Dagnelie { 2006a2cdcdd2SPaul Dagnelie dbuf_prefetch_arg_t *dpa = private; 2007a2cdcdd2SPaul Dagnelie 2008a2cdcdd2SPaul Dagnelie ASSERT3S(dpa->dpa_zb.zb_level, <, dpa->dpa_curlevel); 2009a2cdcdd2SPaul Dagnelie ASSERT3S(dpa->dpa_curlevel, >, 0); 2010a2cdcdd2SPaul Dagnelie if (zio != NULL) { 2011a2cdcdd2SPaul Dagnelie ASSERT3S(BP_GET_LEVEL(zio->io_bp), ==, dpa->dpa_curlevel); 2012a2cdcdd2SPaul Dagnelie ASSERT3U(BP_GET_LSIZE(zio->io_bp), ==, zio->io_size); 2013a2cdcdd2SPaul Dagnelie ASSERT3P(zio->io_spa, ==, dpa->dpa_spa); 2014a2cdcdd2SPaul Dagnelie } 2015a2cdcdd2SPaul Dagnelie 2016a2cdcdd2SPaul Dagnelie dpa->dpa_curlevel--; 2017a2cdcdd2SPaul Dagnelie 2018a2cdcdd2SPaul Dagnelie uint64_t nextblkid = dpa->dpa_zb.zb_blkid >> 2019a2cdcdd2SPaul Dagnelie (dpa->dpa_epbs * (dpa->dpa_curlevel - dpa->dpa_zb.zb_level)); 2020a2cdcdd2SPaul Dagnelie blkptr_t *bp = ((blkptr_t *)abuf->b_data) + 2021a2cdcdd2SPaul Dagnelie P2PHASE(nextblkid, 1ULL << dpa->dpa_epbs); 2022a2cdcdd2SPaul Dagnelie if (BP_IS_HOLE(bp) || (zio != NULL && zio->io_error != 0)) { 2023a2cdcdd2SPaul Dagnelie kmem_free(dpa, sizeof (*dpa)); 2024a2cdcdd2SPaul Dagnelie } else if (dpa->dpa_curlevel == dpa->dpa_zb.zb_level) { 2025a2cdcdd2SPaul Dagnelie ASSERT3U(nextblkid, ==, dpa->dpa_zb.zb_blkid); 2026a2cdcdd2SPaul Dagnelie dbuf_issue_final_prefetch(dpa, bp); 2027a2cdcdd2SPaul Dagnelie kmem_free(dpa, sizeof (*dpa)); 2028a2cdcdd2SPaul Dagnelie } else { 2029a2cdcdd2SPaul Dagnelie arc_flags_t iter_aflags = ARC_FLAG_NOWAIT; 2030a2cdcdd2SPaul Dagnelie zbookmark_phys_t zb; 2031a2cdcdd2SPaul Dagnelie 2032a2cdcdd2SPaul Dagnelie ASSERT3U(dpa->dpa_curlevel, ==, BP_GET_LEVEL(bp)); 2033a2cdcdd2SPaul Dagnelie 2034a2cdcdd2SPaul Dagnelie SET_BOOKMARK(&zb, dpa->dpa_zb.zb_objset, 2035a2cdcdd2SPaul Dagnelie dpa->dpa_zb.zb_object, dpa->dpa_curlevel, nextblkid); 2036a2cdcdd2SPaul Dagnelie 2037a2cdcdd2SPaul Dagnelie (void) arc_read(dpa->dpa_zio, dpa->dpa_spa, 2038a2cdcdd2SPaul Dagnelie bp, dbuf_prefetch_indirect_done, dpa, dpa->dpa_prio, 2039a2cdcdd2SPaul Dagnelie ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE, 2040a2cdcdd2SPaul Dagnelie &iter_aflags, &zb); 2041a2cdcdd2SPaul Dagnelie } 2042a2cdcdd2SPaul Dagnelie (void) arc_buf_remove_ref(abuf, private); 2043a2cdcdd2SPaul Dagnelie } 2044a2cdcdd2SPaul Dagnelie 2045a2cdcdd2SPaul Dagnelie /* 2046a2cdcdd2SPaul Dagnelie * Issue prefetch reads for the given block on the given level. If the indirect 2047a2cdcdd2SPaul Dagnelie * blocks above that block are not in memory, we will read them in 2048a2cdcdd2SPaul Dagnelie * asynchronously. As a result, this call never blocks waiting for a read to 2049a2cdcdd2SPaul Dagnelie * complete. 2050a2cdcdd2SPaul Dagnelie */ 2051a2cdcdd2SPaul Dagnelie void 2052a2cdcdd2SPaul Dagnelie dbuf_prefetch(dnode_t *dn, int64_t level, uint64_t blkid, zio_priority_t prio, 2053a2cdcdd2SPaul Dagnelie arc_flags_t aflags) 2054a2cdcdd2SPaul Dagnelie { 2055a2cdcdd2SPaul Dagnelie blkptr_t bp; 2056a2cdcdd2SPaul Dagnelie int epbs, nlevels, curlevel; 2057a2cdcdd2SPaul Dagnelie uint64_t curblkid; 2058fa9e4066Sahrens 20590a586ceaSMark Shellenbaum ASSERT(blkid != DMU_BONUS_BLKID); 2060fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 2061fa9e4066Sahrens 2062fa9e4066Sahrens if (dnode_block_freed(dn, blkid)) 2063fa9e4066Sahrens return; 2064fa9e4066Sahrens 2065fa9e4066Sahrens /* 2066a2cdcdd2SPaul Dagnelie * This dnode hasn't been written to disk yet, so there's nothing to 2067a2cdcdd2SPaul Dagnelie * prefetch. 2068fa9e4066Sahrens */ 2069a2cdcdd2SPaul Dagnelie nlevels = dn->dn_phys->dn_nlevels; 2070a2cdcdd2SPaul Dagnelie if (level >= nlevels || dn->dn_phys->dn_nblkptr == 0) 2071a2cdcdd2SPaul Dagnelie return; 2072a2cdcdd2SPaul Dagnelie 2073a2cdcdd2SPaul Dagnelie epbs = dn->dn_phys->dn_indblkshift - SPA_BLKPTRSHIFT; 2074a2cdcdd2SPaul Dagnelie if (dn->dn_phys->dn_maxblkid < blkid << (epbs * level)) 2075a2cdcdd2SPaul Dagnelie return; 2076a2cdcdd2SPaul Dagnelie 2077a2cdcdd2SPaul Dagnelie dmu_buf_impl_t *db = dbuf_find(dn->dn_objset, dn->dn_object, 2078a2cdcdd2SPaul Dagnelie level, blkid); 2079a2cdcdd2SPaul Dagnelie if (db != NULL) { 2080fa9e4066Sahrens mutex_exit(&db->db_mtx); 2081a2cdcdd2SPaul Dagnelie /* 2082a2cdcdd2SPaul Dagnelie * This dbuf already exists. It is either CACHED, or 2083a2cdcdd2SPaul Dagnelie * (we assume) about to be read or filled. 2084a2cdcdd2SPaul Dagnelie */ 2085fa9e4066Sahrens return; 2086fa9e4066Sahrens } 2087fa9e4066Sahrens 2088a2cdcdd2SPaul Dagnelie /* 2089a2cdcdd2SPaul Dagnelie * Find the closest ancestor (indirect block) of the target block 2090a2cdcdd2SPaul Dagnelie * that is present in the cache. In this indirect block, we will 2091a2cdcdd2SPaul Dagnelie * find the bp that is at curlevel, curblkid. 2092a2cdcdd2SPaul Dagnelie */ 2093a2cdcdd2SPaul Dagnelie curlevel = level; 2094a2cdcdd2SPaul Dagnelie curblkid = blkid; 2095a2cdcdd2SPaul Dagnelie while (curlevel < nlevels - 1) { 2096a2cdcdd2SPaul Dagnelie int parent_level = curlevel + 1; 2097a2cdcdd2SPaul Dagnelie uint64_t parent_blkid = curblkid >> epbs; 2098a2cdcdd2SPaul Dagnelie dmu_buf_impl_t *db; 2099a2cdcdd2SPaul Dagnelie 2100a2cdcdd2SPaul Dagnelie if (dbuf_hold_impl(dn, parent_level, parent_blkid, 2101a2cdcdd2SPaul Dagnelie FALSE, TRUE, FTAG, &db) == 0) { 2102a2cdcdd2SPaul Dagnelie blkptr_t *bpp = db->db_buf->b_data; 2103a2cdcdd2SPaul Dagnelie bp = bpp[P2PHASE(curblkid, 1 << epbs)]; 2104a2cdcdd2SPaul Dagnelie dbuf_rele(db, FTAG); 2105a2cdcdd2SPaul Dagnelie break; 2106a2cdcdd2SPaul Dagnelie } 2107a2cdcdd2SPaul Dagnelie 2108a2cdcdd2SPaul Dagnelie curlevel = parent_level; 2109a2cdcdd2SPaul Dagnelie curblkid = parent_blkid; 2110a2cdcdd2SPaul Dagnelie } 2111a2cdcdd2SPaul Dagnelie 2112a2cdcdd2SPaul Dagnelie if (curlevel == nlevels - 1) { 2113a2cdcdd2SPaul Dagnelie /* No cached indirect blocks found. */ 2114a2cdcdd2SPaul Dagnelie ASSERT3U(curblkid, <, dn->dn_phys->dn_nblkptr); 2115a2cdcdd2SPaul Dagnelie bp = dn->dn_phys->dn_blkptr[curblkid]; 2116a2cdcdd2SPaul Dagnelie } 2117a2cdcdd2SPaul Dagnelie if (BP_IS_HOLE(&bp)) 2118a2cdcdd2SPaul Dagnelie return; 2119a2cdcdd2SPaul Dagnelie 2120a2cdcdd2SPaul Dagnelie ASSERT3U(curlevel, ==, BP_GET_LEVEL(&bp)); 2121a2cdcdd2SPaul Dagnelie 2122a2cdcdd2SPaul Dagnelie zio_t *pio = zio_root(dmu_objset_spa(dn->dn_objset), NULL, NULL, 2123a2cdcdd2SPaul Dagnelie ZIO_FLAG_CANFAIL); 2124a2cdcdd2SPaul Dagnelie 2125a2cdcdd2SPaul Dagnelie dbuf_prefetch_arg_t *dpa = kmem_zalloc(sizeof (*dpa), KM_SLEEP); 2126b24ab676SJeff Bonwick dsl_dataset_t *ds = dn->dn_objset->os_dsl_dataset; 2127a2cdcdd2SPaul Dagnelie SET_BOOKMARK(&dpa->dpa_zb, ds != NULL ? ds->ds_object : DMU_META_OBJSET, 2128a2cdcdd2SPaul Dagnelie dn->dn_object, level, blkid); 2129a2cdcdd2SPaul Dagnelie dpa->dpa_curlevel = curlevel; 2130a2cdcdd2SPaul Dagnelie dpa->dpa_prio = prio; 2131a2cdcdd2SPaul Dagnelie dpa->dpa_aflags = aflags; 2132a2cdcdd2SPaul Dagnelie dpa->dpa_spa = dn->dn_objset->os_spa; 2133a2cdcdd2SPaul Dagnelie dpa->dpa_epbs = epbs; 2134a2cdcdd2SPaul Dagnelie dpa->dpa_zio = pio; 2135a2cdcdd2SPaul Dagnelie 2136a2cdcdd2SPaul Dagnelie /* 2137a2cdcdd2SPaul Dagnelie * If we have the indirect just above us, no need to do the asynchronous 2138a2cdcdd2SPaul Dagnelie * prefetch chain; we'll just run the last step ourselves. If we're at 2139a2cdcdd2SPaul Dagnelie * a higher level, though, we want to issue the prefetches for all the 2140a2cdcdd2SPaul Dagnelie * indirect blocks asynchronously, so we can go on with whatever we were 2141a2cdcdd2SPaul Dagnelie * doing. 2142a2cdcdd2SPaul Dagnelie */ 2143a2cdcdd2SPaul Dagnelie if (curlevel == level) { 2144a2cdcdd2SPaul Dagnelie ASSERT3U(curblkid, ==, blkid); 2145a2cdcdd2SPaul Dagnelie dbuf_issue_final_prefetch(dpa, &bp); 2146a2cdcdd2SPaul Dagnelie kmem_free(dpa, sizeof (*dpa)); 2147a2cdcdd2SPaul Dagnelie } else { 2148a2cdcdd2SPaul Dagnelie arc_flags_t iter_aflags = ARC_FLAG_NOWAIT; 21497802d7bfSMatthew Ahrens zbookmark_phys_t zb; 2150b24ab676SJeff Bonwick 2151a2cdcdd2SPaul Dagnelie SET_BOOKMARK(&zb, ds != NULL ? ds->ds_object : DMU_META_OBJSET, 2152a2cdcdd2SPaul Dagnelie dn->dn_object, curlevel, curblkid); 2153a2cdcdd2SPaul Dagnelie (void) arc_read(dpa->dpa_zio, dpa->dpa_spa, 2154a2cdcdd2SPaul Dagnelie &bp, dbuf_prefetch_indirect_done, dpa, prio, 2155fa9e4066Sahrens ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE, 2156a2cdcdd2SPaul Dagnelie &iter_aflags, &zb); 2157fa9e4066Sahrens } 2158a2cdcdd2SPaul Dagnelie /* 2159a2cdcdd2SPaul Dagnelie * We use pio here instead of dpa_zio since it's possible that 2160a2cdcdd2SPaul Dagnelie * dpa may have already been freed. 2161a2cdcdd2SPaul Dagnelie */ 2162a2cdcdd2SPaul Dagnelie zio_nowait(pio); 2163fa9e4066Sahrens } 2164fa9e4066Sahrens 2165fa9e4066Sahrens /* 2166fa9e4066Sahrens * Returns with db_holds incremented, and db_mtx not held. 2167fa9e4066Sahrens * Note: dn_struct_rwlock must be held. 2168fa9e4066Sahrens */ 2169fa9e4066Sahrens int 2170a2cdcdd2SPaul Dagnelie dbuf_hold_impl(dnode_t *dn, uint8_t level, uint64_t blkid, 2171a2cdcdd2SPaul Dagnelie boolean_t fail_sparse, boolean_t fail_uncached, 2172fa9e4066Sahrens void *tag, dmu_buf_impl_t **dbp) 2173fa9e4066Sahrens { 2174fa9e4066Sahrens dmu_buf_impl_t *db, *parent = NULL; 2175fa9e4066Sahrens 21760a586ceaSMark Shellenbaum ASSERT(blkid != DMU_BONUS_BLKID); 2177fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 2178fa9e4066Sahrens ASSERT3U(dn->dn_nlevels, >, level); 2179fa9e4066Sahrens 2180fa9e4066Sahrens *dbp = NULL; 2181ea8dc4b6Seschrock top: 2182fa9e4066Sahrens /* dbuf_find() returns with db_mtx held */ 2183e57a022bSJustin T. Gibbs db = dbuf_find(dn->dn_objset, dn->dn_object, level, blkid); 2184fa9e4066Sahrens 2185fa9e4066Sahrens if (db == NULL) { 2186fa9e4066Sahrens blkptr_t *bp = NULL; 2187fa9e4066Sahrens int err; 2188fa9e4066Sahrens 2189a2cdcdd2SPaul Dagnelie if (fail_uncached) 2190a2cdcdd2SPaul Dagnelie return (SET_ERROR(ENOENT)); 2191a2cdcdd2SPaul Dagnelie 2192c543ec06Sahrens ASSERT3P(parent, ==, NULL); 2193fa9e4066Sahrens err = dbuf_findbp(dn, level, blkid, fail_sparse, &parent, &bp); 2194fa9e4066Sahrens if (fail_sparse) { 2195fa9e4066Sahrens if (err == 0 && bp && BP_IS_HOLE(bp)) 2196be6fd75aSMatthew Ahrens err = SET_ERROR(ENOENT); 2197fa9e4066Sahrens if (err) { 2198c543ec06Sahrens if (parent) 2199ea8dc4b6Seschrock dbuf_rele(parent, NULL); 2200fa9e4066Sahrens return (err); 2201fa9e4066Sahrens } 2202fa9e4066Sahrens } 2203ea8dc4b6Seschrock if (err && err != ENOENT) 2204ea8dc4b6Seschrock return (err); 2205fa9e4066Sahrens db = dbuf_create(dn, level, blkid, parent, bp); 2206fa9e4066Sahrens } 2207fa9e4066Sahrens 2208a2cdcdd2SPaul Dagnelie if (fail_uncached && db->db_state != DB_CACHED) { 2209a2cdcdd2SPaul Dagnelie mutex_exit(&db->db_mtx); 2210a2cdcdd2SPaul Dagnelie return (SET_ERROR(ENOENT)); 2211a2cdcdd2SPaul Dagnelie } 2212a2cdcdd2SPaul Dagnelie 2213ea8dc4b6Seschrock if (db->db_buf && refcount_is_zero(&db->db_holds)) { 2214ea8dc4b6Seschrock arc_buf_add_ref(db->db_buf, db); 2215ea8dc4b6Seschrock if (db->db_buf->b_data == NULL) { 2216ea8dc4b6Seschrock dbuf_clear(db); 2217c543ec06Sahrens if (parent) { 2218c543ec06Sahrens dbuf_rele(parent, NULL); 2219c543ec06Sahrens parent = NULL; 2220c543ec06Sahrens } 2221ea8dc4b6Seschrock goto top; 2222ea8dc4b6Seschrock } 2223ea8dc4b6Seschrock ASSERT3P(db->db.db_data, ==, db->db_buf->b_data); 2224ea8dc4b6Seschrock } 2225ea8dc4b6Seschrock 2226ea8dc4b6Seschrock ASSERT(db->db_buf == NULL || arc_referenced(db->db_buf)); 2227ea8dc4b6Seschrock 2228fa9e4066Sahrens /* 2229c717a561Smaybee * If this buffer is currently syncing out, and we are are 2230c717a561Smaybee * still referencing it from db_data, we need to make a copy 2231c717a561Smaybee * of it in case we decide we want to dirty it again in this txg. 2232fa9e4066Sahrens */ 22330a586ceaSMark Shellenbaum if (db->db_level == 0 && db->db_blkid != DMU_BONUS_BLKID && 2234ea8dc4b6Seschrock dn->dn_object != DMU_META_DNODE_OBJECT && 2235c717a561Smaybee db->db_state == DB_CACHED && db->db_data_pending) { 2236c717a561Smaybee dbuf_dirty_record_t *dr = db->db_data_pending; 2237c717a561Smaybee 2238c717a561Smaybee if (dr->dt.dl.dr_data == db->db_buf) { 2239ad23a2dbSjohansen arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 2240fa9e4066Sahrens 2241c717a561Smaybee dbuf_set_data(db, 2242744947dcSTom Erickson arc_buf_alloc(dn->dn_objset->os_spa, 2243c717a561Smaybee db->db.db_size, db, type)); 2244c717a561Smaybee bcopy(dr->dt.dl.dr_data->b_data, db->db.db_data, 2245fa9e4066Sahrens db->db.db_size); 2246fa9e4066Sahrens } 2247c717a561Smaybee } 2248fa9e4066Sahrens 2249ea8dc4b6Seschrock (void) refcount_add(&db->db_holds, tag); 22509c9dc39aSek110237 DBUF_VERIFY(db); 2251fa9e4066Sahrens mutex_exit(&db->db_mtx); 2252fa9e4066Sahrens 2253fa9e4066Sahrens /* NOTE: we can't rele the parent until after we drop the db_mtx */ 2254c543ec06Sahrens if (parent) 2255ea8dc4b6Seschrock dbuf_rele(parent, NULL); 2256fa9e4066Sahrens 2257744947dcSTom Erickson ASSERT3P(DB_DNODE(db), ==, dn); 2258fa9e4066Sahrens ASSERT3U(db->db_blkid, ==, blkid); 2259fa9e4066Sahrens ASSERT3U(db->db_level, ==, level); 2260fa9e4066Sahrens *dbp = db; 2261fa9e4066Sahrens 2262fa9e4066Sahrens return (0); 2263fa9e4066Sahrens } 2264fa9e4066Sahrens 2265fa9e4066Sahrens dmu_buf_impl_t * 2266ea8dc4b6Seschrock dbuf_hold(dnode_t *dn, uint64_t blkid, void *tag) 2267fa9e4066Sahrens { 2268a2cdcdd2SPaul Dagnelie return (dbuf_hold_level(dn, 0, blkid, tag)); 2269fa9e4066Sahrens } 2270fa9e4066Sahrens 2271fa9e4066Sahrens dmu_buf_impl_t * 2272fa9e4066Sahrens dbuf_hold_level(dnode_t *dn, int level, uint64_t blkid, void *tag) 2273fa9e4066Sahrens { 2274fa9e4066Sahrens dmu_buf_impl_t *db; 2275a2cdcdd2SPaul Dagnelie int err = dbuf_hold_impl(dn, level, blkid, FALSE, FALSE, tag, &db); 2276ea8dc4b6Seschrock return (err ? NULL : db); 2277fa9e4066Sahrens } 2278fa9e4066Sahrens 22791934e92fSmaybee void 2280ea8dc4b6Seschrock dbuf_create_bonus(dnode_t *dn) 2281fa9e4066Sahrens { 2282ea8dc4b6Seschrock ASSERT(RW_WRITE_HELD(&dn->dn_struct_rwlock)); 2283ea8dc4b6Seschrock 2284ea8dc4b6Seschrock ASSERT(dn->dn_bonus == NULL); 22850a586ceaSMark Shellenbaum dn->dn_bonus = dbuf_create(dn, 0, DMU_BONUS_BLKID, dn->dn_dbuf, NULL); 22860a586ceaSMark Shellenbaum } 22870a586ceaSMark Shellenbaum 22880a586ceaSMark Shellenbaum int 22890a586ceaSMark Shellenbaum dbuf_spill_set_blksz(dmu_buf_t *db_fake, uint64_t blksz, dmu_tx_t *tx) 22900a586ceaSMark Shellenbaum { 22910a586ceaSMark Shellenbaum dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 2292744947dcSTom Erickson dnode_t *dn; 2293744947dcSTom Erickson 22940a586ceaSMark Shellenbaum if (db->db_blkid != DMU_SPILL_BLKID) 2295be6fd75aSMatthew Ahrens return (SET_ERROR(ENOTSUP)); 22960a586ceaSMark Shellenbaum if (blksz == 0) 22970a586ceaSMark Shellenbaum blksz = SPA_MINBLOCKSIZE; 2298b5152584SMatthew Ahrens ASSERT3U(blksz, <=, spa_maxblocksize(dmu_objset_spa(db->db_objset))); 22990a586ceaSMark Shellenbaum blksz = P2ROUNDUP(blksz, SPA_MINBLOCKSIZE); 23000a586ceaSMark Shellenbaum 2301744947dcSTom Erickson DB_DNODE_ENTER(db); 2302744947dcSTom Erickson dn = DB_DNODE(db); 2303744947dcSTom Erickson rw_enter(&dn->dn_struct_rwlock, RW_WRITER); 23040a586ceaSMark Shellenbaum dbuf_new_size(db, blksz, tx); 2305744947dcSTom Erickson rw_exit(&dn->dn_struct_rwlock); 2306744947dcSTom Erickson DB_DNODE_EXIT(db); 23070a586ceaSMark Shellenbaum 23080a586ceaSMark Shellenbaum return (0); 23090a586ceaSMark Shellenbaum } 23100a586ceaSMark Shellenbaum 23110a586ceaSMark Shellenbaum void 23120a586ceaSMark Shellenbaum dbuf_rm_spill(dnode_t *dn, dmu_tx_t *tx) 23130a586ceaSMark Shellenbaum { 23140a586ceaSMark Shellenbaum dbuf_free_range(dn, DMU_SPILL_BLKID, DMU_SPILL_BLKID, tx); 2315fa9e4066Sahrens } 2316fa9e4066Sahrens 2317ea8dc4b6Seschrock #pragma weak dmu_buf_add_ref = dbuf_add_ref 2318fa9e4066Sahrens void 2319fa9e4066Sahrens dbuf_add_ref(dmu_buf_impl_t *db, void *tag) 2320fa9e4066Sahrens { 2321ea8dc4b6Seschrock int64_t holds = refcount_add(&db->db_holds, tag); 2322ea8dc4b6Seschrock ASSERT(holds > 1); 2323fa9e4066Sahrens } 2324fa9e4066Sahrens 2325e57a022bSJustin T. Gibbs #pragma weak dmu_buf_try_add_ref = dbuf_try_add_ref 2326e57a022bSJustin T. Gibbs boolean_t 2327e57a022bSJustin T. Gibbs dbuf_try_add_ref(dmu_buf_t *db_fake, objset_t *os, uint64_t obj, uint64_t blkid, 2328e57a022bSJustin T. Gibbs void *tag) 2329e57a022bSJustin T. Gibbs { 2330e57a022bSJustin T. Gibbs dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 2331e57a022bSJustin T. Gibbs dmu_buf_impl_t *found_db; 2332e57a022bSJustin T. Gibbs boolean_t result = B_FALSE; 2333e57a022bSJustin T. Gibbs 2334e57a022bSJustin T. Gibbs if (db->db_blkid == DMU_BONUS_BLKID) 2335e57a022bSJustin T. Gibbs found_db = dbuf_find_bonus(os, obj); 2336e57a022bSJustin T. Gibbs else 2337e57a022bSJustin T. Gibbs found_db = dbuf_find(os, obj, 0, blkid); 2338e57a022bSJustin T. Gibbs 2339e57a022bSJustin T. Gibbs if (found_db != NULL) { 2340e57a022bSJustin T. Gibbs if (db == found_db && dbuf_refcount(db) > db->db_dirtycnt) { 2341e57a022bSJustin T. Gibbs (void) refcount_add(&db->db_holds, tag); 2342e57a022bSJustin T. Gibbs result = B_TRUE; 2343e57a022bSJustin T. Gibbs } 2344e57a022bSJustin T. Gibbs mutex_exit(&db->db_mtx); 2345e57a022bSJustin T. Gibbs } 2346e57a022bSJustin T. Gibbs return (result); 2347e57a022bSJustin T. Gibbs } 2348e57a022bSJustin T. Gibbs 2349744947dcSTom Erickson /* 2350744947dcSTom Erickson * If you call dbuf_rele() you had better not be referencing the dnode handle 2351744947dcSTom Erickson * unless you have some other direct or indirect hold on the dnode. (An indirect 2352744947dcSTom Erickson * hold is a hold on one of the dnode's dbufs, including the bonus buffer.) 2353744947dcSTom Erickson * Without that, the dbuf_rele() could lead to a dnode_rele() followed by the 2354744947dcSTom Erickson * dnode's parent dbuf evicting its dnode handles. 2355744947dcSTom Erickson */ 2356fa9e4066Sahrens void 2357ea8dc4b6Seschrock dbuf_rele(dmu_buf_impl_t *db, void *tag) 2358fa9e4066Sahrens { 2359b24ab676SJeff Bonwick mutex_enter(&db->db_mtx); 2360b24ab676SJeff Bonwick dbuf_rele_and_unlock(db, tag); 2361b24ab676SJeff Bonwick } 2362b24ab676SJeff Bonwick 236343466aaeSMax Grossman void 236443466aaeSMax Grossman dmu_buf_rele(dmu_buf_t *db, void *tag) 236543466aaeSMax Grossman { 236643466aaeSMax Grossman dbuf_rele((dmu_buf_impl_t *)db, tag); 236743466aaeSMax Grossman } 236843466aaeSMax Grossman 2369b24ab676SJeff Bonwick /* 2370b24ab676SJeff Bonwick * dbuf_rele() for an already-locked dbuf. This is necessary to allow 2371b24ab676SJeff Bonwick * db_dirtycnt and db_holds to be updated atomically. 2372b24ab676SJeff Bonwick */ 2373b24ab676SJeff Bonwick void 2374b24ab676SJeff Bonwick dbuf_rele_and_unlock(dmu_buf_impl_t *db, void *tag) 2375b24ab676SJeff Bonwick { 2376fa9e4066Sahrens int64_t holds; 2377fa9e4066Sahrens 2378b24ab676SJeff Bonwick ASSERT(MUTEX_HELD(&db->db_mtx)); 23799c9dc39aSek110237 DBUF_VERIFY(db); 2380fa9e4066Sahrens 2381744947dcSTom Erickson /* 2382744947dcSTom Erickson * Remove the reference to the dbuf before removing its hold on the 2383744947dcSTom Erickson * dnode so we can guarantee in dnode_move() that a referenced bonus 2384744947dcSTom Erickson * buffer has a corresponding dnode hold. 2385744947dcSTom Erickson */ 2386fa9e4066Sahrens holds = refcount_remove(&db->db_holds, tag); 2387ea8dc4b6Seschrock ASSERT(holds >= 0); 2388fa9e4066Sahrens 2389c717a561Smaybee /* 2390c717a561Smaybee * We can't freeze indirects if there is a possibility that they 2391c717a561Smaybee * may be modified in the current syncing context. 2392c717a561Smaybee */ 2393c717a561Smaybee if (db->db_buf && holds == (db->db_level == 0 ? db->db_dirtycnt : 0)) 23946b4acc8bSahrens arc_buf_freeze(db->db_buf); 23956b4acc8bSahrens 2396fa9e4066Sahrens if (holds == db->db_dirtycnt && 2397c717a561Smaybee db->db_level == 0 && db->db_immediate_evict) 2398fa9e4066Sahrens dbuf_evict_user(db); 2399ea8dc4b6Seschrock 2400ea8dc4b6Seschrock if (holds == 0) { 24010a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 2402cd485b49SJustin T. Gibbs dnode_t *dn; 2403cd485b49SJustin T. Gibbs 2404cd485b49SJustin T. Gibbs /* 2405cd485b49SJustin T. Gibbs * If the dnode moves here, we cannot cross this 2406cd485b49SJustin T. Gibbs * barrier until the move completes. 2407cd485b49SJustin T. Gibbs */ 2408cd485b49SJustin T. Gibbs DB_DNODE_ENTER(db); 2409cd485b49SJustin T. Gibbs 2410cd485b49SJustin T. Gibbs dn = DB_DNODE(db); 2411cd485b49SJustin T. Gibbs atomic_dec_32(&dn->dn_dbufs_count); 2412cd485b49SJustin T. Gibbs 2413cd485b49SJustin T. Gibbs /* 2414cd485b49SJustin T. Gibbs * Decrementing the dbuf count means that the bonus 2415cd485b49SJustin T. Gibbs * buffer's dnode hold is no longer discounted in 2416cd485b49SJustin T. Gibbs * dnode_move(). The dnode cannot move until after 2417cd485b49SJustin T. Gibbs * the dnode_rele_and_unlock() below. 2418cd485b49SJustin T. Gibbs */ 2419cd485b49SJustin T. Gibbs DB_DNODE_EXIT(db); 2420cd485b49SJustin T. Gibbs 2421cd485b49SJustin T. Gibbs /* 2422cd485b49SJustin T. Gibbs * Do not reference db after its lock is dropped. 2423cd485b49SJustin T. Gibbs * Another thread may evict it. 2424cd485b49SJustin T. Gibbs */ 2425ea8dc4b6Seschrock mutex_exit(&db->db_mtx); 2426744947dcSTom Erickson 2427744947dcSTom Erickson /* 2428cd485b49SJustin T. Gibbs * If the dnode has been freed, evict the bonus 2429cd485b49SJustin T. Gibbs * buffer immediately. The data in the bonus 2430cd485b49SJustin T. Gibbs * buffer is no longer relevant and this prevents 2431cd485b49SJustin T. Gibbs * a stale bonus buffer from being associated 2432cd485b49SJustin T. Gibbs * with this dnode_t should the dnode_t be reused 2433cd485b49SJustin T. Gibbs * prior to being destroyed. 2434744947dcSTom Erickson */ 2435cd485b49SJustin T. Gibbs mutex_enter(&dn->dn_mtx); 2436cd485b49SJustin T. Gibbs if (dn->dn_type == DMU_OT_NONE || 2437cd485b49SJustin T. Gibbs dn->dn_free_txg != 0) { 2438744947dcSTom Erickson /* 2439cd485b49SJustin T. Gibbs * Drop dn_mtx. It is a leaf lock and 2440cd485b49SJustin T. Gibbs * cannot be held when dnode_evict_bonus() 2441cd485b49SJustin T. Gibbs * acquires other locks in order to 2442cd485b49SJustin T. Gibbs * perform the eviction. 2443cd485b49SJustin T. Gibbs * 2444cd485b49SJustin T. Gibbs * Freed dnodes cannot be reused until the 2445cd485b49SJustin T. Gibbs * last hold is released. Since this bonus 2446cd485b49SJustin T. Gibbs * buffer has a hold, the dnode will remain 2447cd485b49SJustin T. Gibbs * in the free state, even without dn_mtx 2448cd485b49SJustin T. Gibbs * held, until the dnode_rele_and_unlock() 2449cd485b49SJustin T. Gibbs * below. 2450744947dcSTom Erickson */ 2451cd485b49SJustin T. Gibbs mutex_exit(&dn->dn_mtx); 2452cd485b49SJustin T. Gibbs dnode_evict_bonus(dn); 2453cd485b49SJustin T. Gibbs mutex_enter(&dn->dn_mtx); 2454cd485b49SJustin T. Gibbs } 2455cd485b49SJustin T. Gibbs dnode_rele_and_unlock(dn, db); 2456ea8dc4b6Seschrock } else if (db->db_buf == NULL) { 2457ea8dc4b6Seschrock /* 2458ea8dc4b6Seschrock * This is a special case: we never associated this 2459ea8dc4b6Seschrock * dbuf with any data allocated from the ARC. 2460ea8dc4b6Seschrock */ 246182c9918fSTim Haley ASSERT(db->db_state == DB_UNCACHED || 246282c9918fSTim Haley db->db_state == DB_NOFILL); 2463ea8dc4b6Seschrock dbuf_evict(db); 2464ea8dc4b6Seschrock } else if (arc_released(db->db_buf)) { 2465ea8dc4b6Seschrock arc_buf_t *buf = db->db_buf; 2466ea8dc4b6Seschrock /* 2467ea8dc4b6Seschrock * This dbuf has anonymous data associated with it. 2468ea8dc4b6Seschrock */ 2469bc9014e6SJustin Gibbs dbuf_clear_data(db); 24703b2aab18SMatthew Ahrens VERIFY(arc_buf_remove_ref(buf, db)); 2471ea8dc4b6Seschrock dbuf_evict(db); 2472ea8dc4b6Seschrock } else { 24733b2aab18SMatthew Ahrens VERIFY(!arc_buf_remove_ref(db->db_buf, db)); 24749253d63dSGeorge Wilson 24759253d63dSGeorge Wilson /* 24769253d63dSGeorge Wilson * A dbuf will be eligible for eviction if either the 24779253d63dSGeorge Wilson * 'primarycache' property is set or a duplicate 24789253d63dSGeorge Wilson * copy of this buffer is already cached in the arc. 24799253d63dSGeorge Wilson * 24809253d63dSGeorge Wilson * In the case of the 'primarycache' a buffer 24819253d63dSGeorge Wilson * is considered for eviction if it matches the 24829253d63dSGeorge Wilson * criteria set in the property. 24839253d63dSGeorge Wilson * 24849253d63dSGeorge Wilson * To decide if our buffer is considered a 24859253d63dSGeorge Wilson * duplicate, we must call into the arc to determine 24869253d63dSGeorge Wilson * if multiple buffers are referencing the same 24879253d63dSGeorge Wilson * block on-disk. If so, then we simply evict 24889253d63dSGeorge Wilson * ourselves. 24899253d63dSGeorge Wilson */ 2490bbfa8ea8SMatthew Ahrens if (!DBUF_IS_CACHEABLE(db)) { 2491bbfa8ea8SMatthew Ahrens if (db->db_blkptr != NULL && 2492bbfa8ea8SMatthew Ahrens !BP_IS_HOLE(db->db_blkptr) && 2493bbfa8ea8SMatthew Ahrens !BP_IS_EMBEDDED(db->db_blkptr)) { 2494bbfa8ea8SMatthew Ahrens spa_t *spa = 2495bbfa8ea8SMatthew Ahrens dmu_objset_spa(db->db_objset); 2496bbfa8ea8SMatthew Ahrens blkptr_t bp = *db->db_blkptr; 24973baa08fcSek110237 dbuf_clear(db); 2498bbfa8ea8SMatthew Ahrens arc_freed(spa, &bp); 2499bbfa8ea8SMatthew Ahrens } else { 2500bbfa8ea8SMatthew Ahrens dbuf_clear(db); 2501bbfa8ea8SMatthew Ahrens } 2502bc9014e6SJustin Gibbs } else if (db->db_objset->os_evicting || 2503bc9014e6SJustin Gibbs arc_buf_eviction_needed(db->db_buf)) { 2504bbfa8ea8SMatthew Ahrens dbuf_clear(db); 2505bbfa8ea8SMatthew Ahrens } else { 2506fa9e4066Sahrens mutex_exit(&db->db_mtx); 2507fa9e4066Sahrens } 2508bbfa8ea8SMatthew Ahrens } 2509ea8dc4b6Seschrock } else { 2510ea8dc4b6Seschrock mutex_exit(&db->db_mtx); 2511fa9e4066Sahrens } 2512fa9e4066Sahrens } 2513fa9e4066Sahrens 2514fa9e4066Sahrens #pragma weak dmu_buf_refcount = dbuf_refcount 2515fa9e4066Sahrens uint64_t 2516fa9e4066Sahrens dbuf_refcount(dmu_buf_impl_t *db) 2517fa9e4066Sahrens { 2518fa9e4066Sahrens return (refcount_count(&db->db_holds)); 2519fa9e4066Sahrens } 2520fa9e4066Sahrens 2521fa9e4066Sahrens void * 2522bc9014e6SJustin Gibbs dmu_buf_replace_user(dmu_buf_t *db_fake, dmu_buf_user_t *old_user, 2523bc9014e6SJustin Gibbs dmu_buf_user_t *new_user) 2524fa9e4066Sahrens { 2525bc9014e6SJustin Gibbs dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 2526bc9014e6SJustin Gibbs 2527bc9014e6SJustin Gibbs mutex_enter(&db->db_mtx); 2528bc9014e6SJustin Gibbs dbuf_verify_user(db, DBVU_NOT_EVICTING); 2529bc9014e6SJustin Gibbs if (db->db_user == old_user) 2530bc9014e6SJustin Gibbs db->db_user = new_user; 2531bc9014e6SJustin Gibbs else 2532bc9014e6SJustin Gibbs old_user = db->db_user; 2533bc9014e6SJustin Gibbs dbuf_verify_user(db, DBVU_NOT_EVICTING); 2534bc9014e6SJustin Gibbs mutex_exit(&db->db_mtx); 2535bc9014e6SJustin Gibbs 2536bc9014e6SJustin Gibbs return (old_user); 2537fa9e4066Sahrens } 2538fa9e4066Sahrens 2539fa9e4066Sahrens void * 2540bc9014e6SJustin Gibbs dmu_buf_set_user(dmu_buf_t *db_fake, dmu_buf_user_t *user) 2541bc9014e6SJustin Gibbs { 2542bc9014e6SJustin Gibbs return (dmu_buf_replace_user(db_fake, NULL, user)); 2543bc9014e6SJustin Gibbs } 2544bc9014e6SJustin Gibbs 2545bc9014e6SJustin Gibbs void * 2546bc9014e6SJustin Gibbs dmu_buf_set_user_ie(dmu_buf_t *db_fake, dmu_buf_user_t *user) 2547fa9e4066Sahrens { 2548fa9e4066Sahrens dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 2549fa9e4066Sahrens 2550c717a561Smaybee db->db_immediate_evict = TRUE; 2551bc9014e6SJustin Gibbs return (dmu_buf_set_user(db_fake, user)); 2552fa9e4066Sahrens } 2553fa9e4066Sahrens 2554fa9e4066Sahrens void * 2555bc9014e6SJustin Gibbs dmu_buf_remove_user(dmu_buf_t *db_fake, dmu_buf_user_t *user) 2556fa9e4066Sahrens { 2557bc9014e6SJustin Gibbs return (dmu_buf_replace_user(db_fake, user, NULL)); 2558fa9e4066Sahrens } 2559fa9e4066Sahrens 2560fa9e4066Sahrens void * 2561fa9e4066Sahrens dmu_buf_get_user(dmu_buf_t *db_fake) 2562fa9e4066Sahrens { 2563fa9e4066Sahrens dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 2564fa9e4066Sahrens 2565bc9014e6SJustin Gibbs dbuf_verify_user(db, DBVU_NOT_EVICTING); 2566bc9014e6SJustin Gibbs return (db->db_user); 2567bc9014e6SJustin Gibbs } 2568bc9014e6SJustin Gibbs 2569bc9014e6SJustin Gibbs void 2570bc9014e6SJustin Gibbs dmu_buf_user_evict_wait() 2571bc9014e6SJustin Gibbs { 2572bc9014e6SJustin Gibbs taskq_wait(dbu_evict_taskq); 2573fa9e4066Sahrens } 2574fa9e4066Sahrens 25753d692628SSanjeev Bagewadi boolean_t 25763d692628SSanjeev Bagewadi dmu_buf_freeable(dmu_buf_t *dbuf) 25773d692628SSanjeev Bagewadi { 25783d692628SSanjeev Bagewadi boolean_t res = B_FALSE; 25793d692628SSanjeev Bagewadi dmu_buf_impl_t *db = (dmu_buf_impl_t *)dbuf; 25803d692628SSanjeev Bagewadi 25813d692628SSanjeev Bagewadi if (db->db_blkptr) 25823d692628SSanjeev Bagewadi res = dsl_dataset_block_freeable(db->db_objset->os_dsl_dataset, 2583c7cd2421SGeorge Wilson db->db_blkptr, db->db_blkptr->blk_birth); 25843d692628SSanjeev Bagewadi 25853d692628SSanjeev Bagewadi return (res); 25863d692628SSanjeev Bagewadi } 25873d692628SSanjeev Bagewadi 258880901aeaSGeorge Wilson blkptr_t * 258980901aeaSGeorge Wilson dmu_buf_get_blkptr(dmu_buf_t *db) 259080901aeaSGeorge Wilson { 259180901aeaSGeorge Wilson dmu_buf_impl_t *dbi = (dmu_buf_impl_t *)db; 259280901aeaSGeorge Wilson return (dbi->db_blkptr); 259380901aeaSGeorge Wilson } 259480901aeaSGeorge Wilson 2595c717a561Smaybee static void 2596c717a561Smaybee dbuf_check_blkptr(dnode_t *dn, dmu_buf_impl_t *db) 2597fa9e4066Sahrens { 2598c717a561Smaybee /* ASSERT(dmu_tx_is_syncing(tx) */ 2599c717a561Smaybee ASSERT(MUTEX_HELD(&db->db_mtx)); 2600c717a561Smaybee 2601c717a561Smaybee if (db->db_blkptr != NULL) 2602c717a561Smaybee return; 2603c717a561Smaybee 26040a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) { 26050a586ceaSMark Shellenbaum db->db_blkptr = &dn->dn_phys->dn_spill; 26060a586ceaSMark Shellenbaum BP_ZERO(db->db_blkptr); 26070a586ceaSMark Shellenbaum return; 26080a586ceaSMark Shellenbaum } 2609c717a561Smaybee if (db->db_level == dn->dn_phys->dn_nlevels-1) { 2610c717a561Smaybee /* 2611c717a561Smaybee * This buffer was allocated at a time when there was 2612c717a561Smaybee * no available blkptrs from the dnode, or it was 2613c717a561Smaybee * inappropriate to hook it in (i.e., nlevels mis-match). 2614c717a561Smaybee */ 2615c717a561Smaybee ASSERT(db->db_blkid < dn->dn_phys->dn_nblkptr); 2616c717a561Smaybee ASSERT(db->db_parent == NULL); 2617c717a561Smaybee db->db_parent = dn->dn_dbuf; 2618c717a561Smaybee db->db_blkptr = &dn->dn_phys->dn_blkptr[db->db_blkid]; 2619c717a561Smaybee DBUF_VERIFY(db); 2620c717a561Smaybee } else { 2621c717a561Smaybee dmu_buf_impl_t *parent = db->db_parent; 2622c717a561Smaybee int epbs = dn->dn_phys->dn_indblkshift - SPA_BLKPTRSHIFT; 2623c717a561Smaybee 2624c717a561Smaybee ASSERT(dn->dn_phys->dn_nlevels > 1); 2625c717a561Smaybee if (parent == NULL) { 2626c717a561Smaybee mutex_exit(&db->db_mtx); 2627c717a561Smaybee rw_enter(&dn->dn_struct_rwlock, RW_READER); 2628a2cdcdd2SPaul Dagnelie parent = dbuf_hold_level(dn, db->db_level + 1, 2629a2cdcdd2SPaul Dagnelie db->db_blkid >> epbs, db); 2630c717a561Smaybee rw_exit(&dn->dn_struct_rwlock); 2631c717a561Smaybee mutex_enter(&db->db_mtx); 2632c717a561Smaybee db->db_parent = parent; 2633c717a561Smaybee } 2634c717a561Smaybee db->db_blkptr = (blkptr_t *)parent->db.db_data + 2635c717a561Smaybee (db->db_blkid & ((1ULL << epbs) - 1)); 2636c717a561Smaybee DBUF_VERIFY(db); 2637c717a561Smaybee } 2638c717a561Smaybee } 2639c717a561Smaybee 2640c717a561Smaybee static void 2641c717a561Smaybee dbuf_sync_indirect(dbuf_dirty_record_t *dr, dmu_tx_t *tx) 2642c717a561Smaybee { 2643c717a561Smaybee dmu_buf_impl_t *db = dr->dr_dbuf; 2644744947dcSTom Erickson dnode_t *dn; 2645c717a561Smaybee zio_t *zio; 2646c717a561Smaybee 2647c717a561Smaybee ASSERT(dmu_tx_is_syncing(tx)); 2648c717a561Smaybee 2649c717a561Smaybee dprintf_dbuf_bp(db, db->db_blkptr, "blkptr=%p", db->db_blkptr); 2650c717a561Smaybee 2651c717a561Smaybee mutex_enter(&db->db_mtx); 2652c717a561Smaybee 2653c717a561Smaybee ASSERT(db->db_level > 0); 2654c717a561Smaybee DBUF_VERIFY(db); 2655c717a561Smaybee 26563e30c24aSWill Andrews /* Read the block if it hasn't been read yet. */ 2657c717a561Smaybee if (db->db_buf == NULL) { 2658c717a561Smaybee mutex_exit(&db->db_mtx); 2659c717a561Smaybee (void) dbuf_read(db, NULL, DB_RF_MUST_SUCCEED); 2660c717a561Smaybee mutex_enter(&db->db_mtx); 2661c717a561Smaybee } 2662c717a561Smaybee ASSERT3U(db->db_state, ==, DB_CACHED); 2663c717a561Smaybee ASSERT(db->db_buf != NULL); 2664c717a561Smaybee 2665744947dcSTom Erickson DB_DNODE_ENTER(db); 2666744947dcSTom Erickson dn = DB_DNODE(db); 26673e30c24aSWill Andrews /* Indirect block size must match what the dnode thinks it is. */ 2668744947dcSTom Erickson ASSERT3U(db->db.db_size, ==, 1<<dn->dn_phys->dn_indblkshift); 2669c717a561Smaybee dbuf_check_blkptr(dn, db); 2670744947dcSTom Erickson DB_DNODE_EXIT(db); 2671c717a561Smaybee 26723e30c24aSWill Andrews /* Provide the pending dirty record to child dbufs */ 2673c717a561Smaybee db->db_data_pending = dr; 2674c717a561Smaybee 2675af2c4821Smaybee mutex_exit(&db->db_mtx); 2676088f3894Sahrens dbuf_write(dr, db->db_buf, tx); 2677c717a561Smaybee 2678c717a561Smaybee zio = dr->dr_zio; 2679c717a561Smaybee mutex_enter(&dr->dt.di.dr_mtx); 268046e1baa6SMatthew Ahrens dbuf_sync_list(&dr->dt.di.dr_children, db->db_level - 1, tx); 2681c717a561Smaybee ASSERT(list_head(&dr->dt.di.dr_children) == NULL); 2682c717a561Smaybee mutex_exit(&dr->dt.di.dr_mtx); 2683c717a561Smaybee zio_nowait(zio); 2684c717a561Smaybee } 2685c717a561Smaybee 2686c717a561Smaybee static void 2687c717a561Smaybee dbuf_sync_leaf(dbuf_dirty_record_t *dr, dmu_tx_t *tx) 2688c717a561Smaybee { 2689c717a561Smaybee arc_buf_t **datap = &dr->dt.dl.dr_data; 2690c717a561Smaybee dmu_buf_impl_t *db = dr->dr_dbuf; 2691744947dcSTom Erickson dnode_t *dn; 2692744947dcSTom Erickson objset_t *os; 2693c717a561Smaybee uint64_t txg = tx->tx_txg; 2694fa9e4066Sahrens 2695fa9e4066Sahrens ASSERT(dmu_tx_is_syncing(tx)); 2696fa9e4066Sahrens 2697fa9e4066Sahrens dprintf_dbuf_bp(db, db->db_blkptr, "blkptr=%p", db->db_blkptr); 2698fa9e4066Sahrens 2699fa9e4066Sahrens mutex_enter(&db->db_mtx); 2700fa9e4066Sahrens /* 2701fa9e4066Sahrens * To be synced, we must be dirtied. But we 2702fa9e4066Sahrens * might have been freed after the dirty. 2703fa9e4066Sahrens */ 2704fa9e4066Sahrens if (db->db_state == DB_UNCACHED) { 2705fa9e4066Sahrens /* This buffer has been freed since it was dirtied */ 2706fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 2707fa9e4066Sahrens } else if (db->db_state == DB_FILL) { 2708fa9e4066Sahrens /* This buffer was freed and is now being re-filled */ 2709c717a561Smaybee ASSERT(db->db.db_data != dr->dt.dl.dr_data); 2710fa9e4066Sahrens } else { 271182c9918fSTim Haley ASSERT(db->db_state == DB_CACHED || db->db_state == DB_NOFILL); 2712fa9e4066Sahrens } 27139c9dc39aSek110237 DBUF_VERIFY(db); 2714fa9e4066Sahrens 2715744947dcSTom Erickson DB_DNODE_ENTER(db); 2716744947dcSTom Erickson dn = DB_DNODE(db); 2717744947dcSTom Erickson 27180a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) { 27190a586ceaSMark Shellenbaum mutex_enter(&dn->dn_mtx); 27200a586ceaSMark Shellenbaum dn->dn_phys->dn_flags |= DNODE_FLAG_SPILL_BLKPTR; 27210a586ceaSMark Shellenbaum mutex_exit(&dn->dn_mtx); 27220a586ceaSMark Shellenbaum } 27230a586ceaSMark Shellenbaum 2724fa9e4066Sahrens /* 2725c717a561Smaybee * If this is a bonus buffer, simply copy the bonus data into the 2726c717a561Smaybee * dnode. It will be written out when the dnode is synced (and it 2727c717a561Smaybee * will be synced, since it must have been dirty for dbuf_sync to 2728c717a561Smaybee * be called). 2729fa9e4066Sahrens */ 27300a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 2731c717a561Smaybee dbuf_dirty_record_t **drp; 27321934e92fSmaybee 2733ea8dc4b6Seschrock ASSERT(*datap != NULL); 2734fb09f5aaSMadhav Suresh ASSERT0(db->db_level); 2735ea8dc4b6Seschrock ASSERT3U(dn->dn_phys->dn_bonuslen, <=, DN_MAX_BONUSLEN); 2736ea8dc4b6Seschrock bcopy(*datap, DN_BONUS(dn->dn_phys), dn->dn_phys->dn_bonuslen); 2737744947dcSTom Erickson DB_DNODE_EXIT(db); 2738744947dcSTom Erickson 27390e8c6158Smaybee if (*datap != db->db.db_data) { 2740ea8dc4b6Seschrock zio_buf_free(*datap, DN_MAX_BONUSLEN); 27415a98e54bSBrendan Gregg - Sun Microsystems arc_space_return(DN_MAX_BONUSLEN, ARC_SPACE_OTHER); 27420e8c6158Smaybee } 2743ea8dc4b6Seschrock db->db_data_pending = NULL; 2744c717a561Smaybee drp = &db->db_last_dirty; 2745c717a561Smaybee while (*drp != dr) 2746c717a561Smaybee drp = &(*drp)->dr_next; 274717f17c2dSbonwick ASSERT(dr->dr_next == NULL); 2748b24ab676SJeff Bonwick ASSERT(dr->dr_dbuf == db); 274917f17c2dSbonwick *drp = dr->dr_next; 2750c717a561Smaybee kmem_free(dr, sizeof (dbuf_dirty_record_t)); 2751ea8dc4b6Seschrock ASSERT(db->db_dirtycnt > 0); 2752ea8dc4b6Seschrock db->db_dirtycnt -= 1; 2753b24ab676SJeff Bonwick dbuf_rele_and_unlock(db, (void *)(uintptr_t)txg); 2754ea8dc4b6Seschrock return; 2755ea8dc4b6Seschrock } 2756ea8dc4b6Seschrock 2757744947dcSTom Erickson os = dn->dn_objset; 2758744947dcSTom Erickson 2759c5c6ffa0Smaybee /* 2760f82bfe17Sgw25295 * This function may have dropped the db_mtx lock allowing a dmu_sync 2761f82bfe17Sgw25295 * operation to sneak in. As a result, we need to ensure that we 2762f82bfe17Sgw25295 * don't check the dr_override_state until we have returned from 2763f82bfe17Sgw25295 * dbuf_check_blkptr. 2764f82bfe17Sgw25295 */ 2765f82bfe17Sgw25295 dbuf_check_blkptr(dn, db); 2766f82bfe17Sgw25295 2767f82bfe17Sgw25295 /* 2768744947dcSTom Erickson * If this buffer is in the middle of an immediate write, 2769c717a561Smaybee * wait for the synchronous IO to complete. 2770c5c6ffa0Smaybee */ 2771c717a561Smaybee while (dr->dt.dl.dr_override_state == DR_IN_DMU_SYNC) { 2772c5c6ffa0Smaybee ASSERT(dn->dn_object != DMU_META_DNODE_OBJECT); 2773c5c6ffa0Smaybee cv_wait(&db->db_changed, &db->db_mtx); 2774c717a561Smaybee ASSERT(dr->dt.dl.dr_override_state != DR_NOT_OVERRIDDEN); 2775c5c6ffa0Smaybee } 2776c717a561Smaybee 2777ab69d62fSMatthew Ahrens if (db->db_state != DB_NOFILL && 2778ab69d62fSMatthew Ahrens dn->dn_object != DMU_META_DNODE_OBJECT && 2779ab69d62fSMatthew Ahrens refcount_count(&db->db_holds) > 1 && 2780b24ab676SJeff Bonwick dr->dt.dl.dr_override_state != DR_OVERRIDDEN && 2781ab69d62fSMatthew Ahrens *datap == db->db_buf) { 2782fa9e4066Sahrens /* 278382c9918fSTim Haley * If this buffer is currently "in use" (i.e., there 278482c9918fSTim Haley * are active holds and db_data still references it), 278582c9918fSTim Haley * then make a copy before we start the write so that 278682c9918fSTim Haley * any modifications from the open txg will not leak 278782c9918fSTim Haley * into this write. 2788fa9e4066Sahrens * 278982c9918fSTim Haley * NOTE: this copy does not need to be made for 279082c9918fSTim Haley * objects only modified in the syncing context (e.g. 279182c9918fSTim Haley * DNONE_DNODE blocks). 2792fa9e4066Sahrens */ 2793ab69d62fSMatthew Ahrens int blksz = arc_buf_size(*datap); 2794ab69d62fSMatthew Ahrens arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 2795ab69d62fSMatthew Ahrens *datap = arc_buf_alloc(os->os_spa, blksz, db, type); 2796c717a561Smaybee bcopy(db->db.db_data, (*datap)->b_data, blksz); 2797fa9e4066Sahrens } 2798c717a561Smaybee db->db_data_pending = dr; 2799fa9e4066Sahrens 2800fa9e4066Sahrens mutex_exit(&db->db_mtx); 2801fa9e4066Sahrens 2802088f3894Sahrens dbuf_write(dr, *datap, tx); 2803c717a561Smaybee 2804c717a561Smaybee ASSERT(!list_link_active(&dr->dr_dirty_node)); 2805744947dcSTom Erickson if (dn->dn_object == DMU_META_DNODE_OBJECT) { 2806c717a561Smaybee list_insert_tail(&dn->dn_dirty_records[txg&TXG_MASK], dr); 2807744947dcSTom Erickson DB_DNODE_EXIT(db); 2808744947dcSTom Erickson } else { 2809744947dcSTom Erickson /* 2810744947dcSTom Erickson * Although zio_nowait() does not "wait for an IO", it does 2811744947dcSTom Erickson * initiate the IO. If this is an empty write it seems plausible 2812744947dcSTom Erickson * that the IO could actually be completed before the nowait 2813744947dcSTom Erickson * returns. We need to DB_DNODE_EXIT() first in case 2814744947dcSTom Erickson * zio_nowait() invalidates the dbuf. 2815744947dcSTom Erickson */ 2816744947dcSTom Erickson DB_DNODE_EXIT(db); 2817c717a561Smaybee zio_nowait(dr->dr_zio); 2818fa9e4066Sahrens } 2819744947dcSTom Erickson } 2820c717a561Smaybee 2821c717a561Smaybee void 282246e1baa6SMatthew Ahrens dbuf_sync_list(list_t *list, int level, dmu_tx_t *tx) 2823c717a561Smaybee { 2824c717a561Smaybee dbuf_dirty_record_t *dr; 2825c717a561Smaybee 2826c717a561Smaybee while (dr = list_head(list)) { 2827c717a561Smaybee if (dr->dr_zio != NULL) { 2828c717a561Smaybee /* 2829c717a561Smaybee * If we find an already initialized zio then we 2830c717a561Smaybee * are processing the meta-dnode, and we have finished. 2831c717a561Smaybee * The dbufs for all dnodes are put back on the list 2832c717a561Smaybee * during processing, so that we can zio_wait() 2833c717a561Smaybee * these IOs after initiating all child IOs. 2834c717a561Smaybee */ 2835c717a561Smaybee ASSERT3U(dr->dr_dbuf->db.db_object, ==, 2836c717a561Smaybee DMU_META_DNODE_OBJECT); 2837c717a561Smaybee break; 2838fa9e4066Sahrens } 283946e1baa6SMatthew Ahrens if (dr->dr_dbuf->db_blkid != DMU_BONUS_BLKID && 284046e1baa6SMatthew Ahrens dr->dr_dbuf->db_blkid != DMU_SPILL_BLKID) { 284146e1baa6SMatthew Ahrens VERIFY3U(dr->dr_dbuf->db_level, ==, level); 284246e1baa6SMatthew Ahrens } 2843c717a561Smaybee list_remove(list, dr); 2844c717a561Smaybee if (dr->dr_dbuf->db_level > 0) 2845c717a561Smaybee dbuf_sync_indirect(dr, tx); 2846c717a561Smaybee else 2847c717a561Smaybee dbuf_sync_leaf(dr, tx); 2848c717a561Smaybee } 2849c717a561Smaybee } 2850c717a561Smaybee 2851fa9e4066Sahrens /* ARGSUSED */ 2852fa9e4066Sahrens static void 2853c717a561Smaybee dbuf_write_ready(zio_t *zio, arc_buf_t *buf, void *vdb) 2854fa9e4066Sahrens { 2855fa9e4066Sahrens dmu_buf_impl_t *db = vdb; 2856744947dcSTom Erickson dnode_t *dn; 2857e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 2858c717a561Smaybee blkptr_t *bp_orig = &zio->io_bp_orig; 2859b24ab676SJeff Bonwick spa_t *spa = zio->io_spa; 2860b24ab676SJeff Bonwick int64_t delta; 2861fa9e4066Sahrens uint64_t fill = 0; 2862b24ab676SJeff Bonwick int i; 2863fa9e4066Sahrens 28645d7b4d43SMatthew Ahrens ASSERT3P(db->db_blkptr, ==, bp); 2865e14bb325SJeff Bonwick 2866744947dcSTom Erickson DB_DNODE_ENTER(db); 2867744947dcSTom Erickson dn = DB_DNODE(db); 2868b24ab676SJeff Bonwick delta = bp_get_dsize_sync(spa, bp) - bp_get_dsize_sync(spa, bp_orig); 2869b24ab676SJeff Bonwick dnode_diduse_space(dn, delta - zio->io_prev_space_delta); 2870b24ab676SJeff Bonwick zio->io_prev_space_delta = delta; 2871fa9e4066Sahrens 287243466aaeSMax Grossman if (bp->blk_birth != 0) { 28730a586ceaSMark Shellenbaum ASSERT((db->db_blkid != DMU_SPILL_BLKID && 28740a586ceaSMark Shellenbaum BP_GET_TYPE(bp) == dn->dn_type) || 28750a586ceaSMark Shellenbaum (db->db_blkid == DMU_SPILL_BLKID && 28765d7b4d43SMatthew Ahrens BP_GET_TYPE(bp) == dn->dn_bonustype) || 28775d7b4d43SMatthew Ahrens BP_IS_EMBEDDED(bp)); 2878e14bb325SJeff Bonwick ASSERT(BP_GET_LEVEL(bp) == db->db_level); 287943466aaeSMax Grossman } 2880e14bb325SJeff Bonwick 2881fa9e4066Sahrens mutex_enter(&db->db_mtx); 2882fa9e4066Sahrens 28830a586ceaSMark Shellenbaum #ifdef ZFS_DEBUG 28840a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) { 28850a586ceaSMark Shellenbaum ASSERT(dn->dn_phys->dn_flags & DNODE_FLAG_SPILL_BLKPTR); 28860a586ceaSMark Shellenbaum ASSERT(!(BP_IS_HOLE(db->db_blkptr)) && 28870a586ceaSMark Shellenbaum db->db_blkptr == &dn->dn_phys->dn_spill); 28880a586ceaSMark Shellenbaum } 28890a586ceaSMark Shellenbaum #endif 28900a586ceaSMark Shellenbaum 2891fa9e4066Sahrens if (db->db_level == 0) { 2892fa9e4066Sahrens mutex_enter(&dn->dn_mtx); 28930a586ceaSMark Shellenbaum if (db->db_blkid > dn->dn_phys->dn_maxblkid && 28940a586ceaSMark Shellenbaum db->db_blkid != DMU_SPILL_BLKID) 2895fa9e4066Sahrens dn->dn_phys->dn_maxblkid = db->db_blkid; 2896fa9e4066Sahrens mutex_exit(&dn->dn_mtx); 2897fa9e4066Sahrens 2898fa9e4066Sahrens if (dn->dn_type == DMU_OT_DNODE) { 2899fa9e4066Sahrens dnode_phys_t *dnp = db->db.db_data; 2900fa9e4066Sahrens for (i = db->db.db_size >> DNODE_SHIFT; i > 0; 2901fa9e4066Sahrens i--, dnp++) { 2902fa9e4066Sahrens if (dnp->dn_type != DMU_OT_NONE) 2903fa9e4066Sahrens fill++; 2904fa9e4066Sahrens } 2905fa9e4066Sahrens } else { 290643466aaeSMax Grossman if (BP_IS_HOLE(bp)) { 290743466aaeSMax Grossman fill = 0; 290843466aaeSMax Grossman } else { 2909fa9e4066Sahrens fill = 1; 2910fa9e4066Sahrens } 291143466aaeSMax Grossman } 2912fa9e4066Sahrens } else { 2913e14bb325SJeff Bonwick blkptr_t *ibp = db->db.db_data; 2914fa9e4066Sahrens ASSERT3U(db->db.db_size, ==, 1<<dn->dn_phys->dn_indblkshift); 2915e14bb325SJeff Bonwick for (i = db->db.db_size >> SPA_BLKPTRSHIFT; i > 0; i--, ibp++) { 2916e14bb325SJeff Bonwick if (BP_IS_HOLE(ibp)) 2917fa9e4066Sahrens continue; 29185d7b4d43SMatthew Ahrens fill += BP_GET_FILL(ibp); 2919fa9e4066Sahrens } 2920fa9e4066Sahrens } 2921744947dcSTom Erickson DB_DNODE_EXIT(db); 2922fa9e4066Sahrens 29235d7b4d43SMatthew Ahrens if (!BP_IS_EMBEDDED(bp)) 2924e14bb325SJeff Bonwick bp->blk_fill = fill; 2925fa9e4066Sahrens 2926fa9e4066Sahrens mutex_exit(&db->db_mtx); 2927fa9e4066Sahrens } 2928fa9e4066Sahrens 292969962b56SMatthew Ahrens /* 293069962b56SMatthew Ahrens * The SPA will call this callback several times for each zio - once 293169962b56SMatthew Ahrens * for every physical child i/o (zio->io_phys_children times). This 293269962b56SMatthew Ahrens * allows the DMU to monitor the progress of each logical i/o. For example, 293369962b56SMatthew Ahrens * there may be 2 copies of an indirect block, or many fragments of a RAID-Z 293469962b56SMatthew Ahrens * block. There may be a long delay before all copies/fragments are completed, 293569962b56SMatthew Ahrens * so this callback allows us to retire dirty space gradually, as the physical 293669962b56SMatthew Ahrens * i/os complete. 293769962b56SMatthew Ahrens */ 293869962b56SMatthew Ahrens /* ARGSUSED */ 293969962b56SMatthew Ahrens static void 294069962b56SMatthew Ahrens dbuf_write_physdone(zio_t *zio, arc_buf_t *buf, void *arg) 294169962b56SMatthew Ahrens { 294269962b56SMatthew Ahrens dmu_buf_impl_t *db = arg; 294369962b56SMatthew Ahrens objset_t *os = db->db_objset; 294469962b56SMatthew Ahrens dsl_pool_t *dp = dmu_objset_pool(os); 294569962b56SMatthew Ahrens dbuf_dirty_record_t *dr; 294669962b56SMatthew Ahrens int delta = 0; 294769962b56SMatthew Ahrens 294869962b56SMatthew Ahrens dr = db->db_data_pending; 294969962b56SMatthew Ahrens ASSERT3U(dr->dr_txg, ==, zio->io_txg); 295069962b56SMatthew Ahrens 295169962b56SMatthew Ahrens /* 295269962b56SMatthew Ahrens * The callback will be called io_phys_children times. Retire one 295369962b56SMatthew Ahrens * portion of our dirty space each time we are called. Any rounding 295469962b56SMatthew Ahrens * error will be cleaned up by dsl_pool_sync()'s call to 295569962b56SMatthew Ahrens * dsl_pool_undirty_space(). 295669962b56SMatthew Ahrens */ 295769962b56SMatthew Ahrens delta = dr->dr_accounted / zio->io_phys_children; 295869962b56SMatthew Ahrens dsl_pool_undirty_space(dp, delta, zio->io_txg); 295969962b56SMatthew Ahrens } 296069962b56SMatthew Ahrens 2961c717a561Smaybee /* ARGSUSED */ 2962c717a561Smaybee static void 2963c717a561Smaybee dbuf_write_done(zio_t *zio, arc_buf_t *buf, void *vdb) 2964c717a561Smaybee { 2965c717a561Smaybee dmu_buf_impl_t *db = vdb; 2966b24ab676SJeff Bonwick blkptr_t *bp_orig = &zio->io_bp_orig; 296743466aaeSMax Grossman blkptr_t *bp = db->db_blkptr; 296843466aaeSMax Grossman objset_t *os = db->db_objset; 296943466aaeSMax Grossman dmu_tx_t *tx = os->os_synctx; 2970c717a561Smaybee dbuf_dirty_record_t **drp, *dr; 2971c717a561Smaybee 2972fb09f5aaSMadhav Suresh ASSERT0(zio->io_error); 2973b24ab676SJeff Bonwick ASSERT(db->db_blkptr == bp); 2974b24ab676SJeff Bonwick 297580901aeaSGeorge Wilson /* 297680901aeaSGeorge Wilson * For nopwrites and rewrites we ensure that the bp matches our 297780901aeaSGeorge Wilson * original and bypass all the accounting. 297880901aeaSGeorge Wilson */ 297980901aeaSGeorge Wilson if (zio->io_flags & (ZIO_FLAG_IO_REWRITE | ZIO_FLAG_NOPWRITE)) { 2980b24ab676SJeff Bonwick ASSERT(BP_EQUAL(bp, bp_orig)); 2981b24ab676SJeff Bonwick } else { 298243466aaeSMax Grossman dsl_dataset_t *ds = os->os_dsl_dataset; 2983b24ab676SJeff Bonwick (void) dsl_dataset_block_kill(ds, bp_orig, tx, B_TRUE); 2984b24ab676SJeff Bonwick dsl_dataset_block_born(ds, bp, tx); 2985b24ab676SJeff Bonwick } 2986c717a561Smaybee 2987c717a561Smaybee mutex_enter(&db->db_mtx); 2988c717a561Smaybee 2989b24ab676SJeff Bonwick DBUF_VERIFY(db); 2990b24ab676SJeff Bonwick 2991c717a561Smaybee drp = &db->db_last_dirty; 299217f17c2dSbonwick while ((dr = *drp) != db->db_data_pending) 299317f17c2dSbonwick drp = &dr->dr_next; 299417f17c2dSbonwick ASSERT(!list_link_active(&dr->dr_dirty_node)); 2995b24ab676SJeff Bonwick ASSERT(dr->dr_dbuf == db); 299617f17c2dSbonwick ASSERT(dr->dr_next == NULL); 299717f17c2dSbonwick *drp = dr->dr_next; 2998c717a561Smaybee 29990a586ceaSMark Shellenbaum #ifdef ZFS_DEBUG 30000a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) { 3001744947dcSTom Erickson dnode_t *dn; 3002744947dcSTom Erickson 3003744947dcSTom Erickson DB_DNODE_ENTER(db); 3004744947dcSTom Erickson dn = DB_DNODE(db); 30050a586ceaSMark Shellenbaum ASSERT(dn->dn_phys->dn_flags & DNODE_FLAG_SPILL_BLKPTR); 30060a586ceaSMark Shellenbaum ASSERT(!(BP_IS_HOLE(db->db_blkptr)) && 30070a586ceaSMark Shellenbaum db->db_blkptr == &dn->dn_phys->dn_spill); 3008744947dcSTom Erickson DB_DNODE_EXIT(db); 30090a586ceaSMark Shellenbaum } 30100a586ceaSMark Shellenbaum #endif 30110a586ceaSMark Shellenbaum 3012c717a561Smaybee if (db->db_level == 0) { 30130a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 3014c717a561Smaybee ASSERT(dr->dt.dl.dr_override_state == DR_NOT_OVERRIDDEN); 301582c9918fSTim Haley if (db->db_state != DB_NOFILL) { 3016c717a561Smaybee if (dr->dt.dl.dr_data != db->db_buf) 301782c9918fSTim Haley VERIFY(arc_buf_remove_ref(dr->dt.dl.dr_data, 30183b2aab18SMatthew Ahrens db)); 3019b24ab676SJeff Bonwick else if (!arc_released(db->db_buf)) 3020c717a561Smaybee arc_set_callback(db->db_buf, dbuf_do_evict, db); 302182c9918fSTim Haley } 3022c717a561Smaybee } else { 3023744947dcSTom Erickson dnode_t *dn; 3024744947dcSTom Erickson 3025744947dcSTom Erickson DB_DNODE_ENTER(db); 3026744947dcSTom Erickson dn = DB_DNODE(db); 3027c717a561Smaybee ASSERT(list_head(&dr->dt.di.dr_children) == NULL); 3028c717a561Smaybee ASSERT3U(db->db.db_size, ==, 1 << dn->dn_phys->dn_indblkshift); 3029c717a561Smaybee if (!BP_IS_HOLE(db->db_blkptr)) { 3030c717a561Smaybee int epbs = 3031c717a561Smaybee dn->dn_phys->dn_indblkshift - SPA_BLKPTRSHIFT; 303243466aaeSMax Grossman ASSERT3U(db->db_blkid, <=, 303343466aaeSMax Grossman dn->dn_phys->dn_maxblkid >> (db->db_level * epbs)); 3034c717a561Smaybee ASSERT3U(BP_GET_LSIZE(db->db_blkptr), ==, 3035c717a561Smaybee db->db.db_size); 30365d7b4d43SMatthew Ahrens if (!arc_released(db->db_buf)) 3037c717a561Smaybee arc_set_callback(db->db_buf, dbuf_do_evict, db); 3038c717a561Smaybee } 3039744947dcSTom Erickson DB_DNODE_EXIT(db); 3040c25056deSgw25295 mutex_destroy(&dr->dt.di.dr_mtx); 3041c25056deSgw25295 list_destroy(&dr->dt.di.dr_children); 3042c717a561Smaybee } 3043c717a561Smaybee kmem_free(dr, sizeof (dbuf_dirty_record_t)); 3044c717a561Smaybee 3045c717a561Smaybee cv_broadcast(&db->db_changed); 3046c717a561Smaybee ASSERT(db->db_dirtycnt > 0); 3047c717a561Smaybee db->db_dirtycnt -= 1; 3048c717a561Smaybee db->db_data_pending = NULL; 304943466aaeSMax Grossman dbuf_rele_and_unlock(db, (void *)(uintptr_t)tx->tx_txg); 3050b24ab676SJeff Bonwick } 3051b24ab676SJeff Bonwick 3052b24ab676SJeff Bonwick static void 3053b24ab676SJeff Bonwick dbuf_write_nofill_ready(zio_t *zio) 3054b24ab676SJeff Bonwick { 3055b24ab676SJeff Bonwick dbuf_write_ready(zio, NULL, zio->io_private); 3056b24ab676SJeff Bonwick } 3057b24ab676SJeff Bonwick 3058b24ab676SJeff Bonwick static void 3059b24ab676SJeff Bonwick dbuf_write_nofill_done(zio_t *zio) 3060b24ab676SJeff Bonwick { 3061b24ab676SJeff Bonwick dbuf_write_done(zio, NULL, zio->io_private); 3062b24ab676SJeff Bonwick } 3063b24ab676SJeff Bonwick 3064b24ab676SJeff Bonwick static void 3065b24ab676SJeff Bonwick dbuf_write_override_ready(zio_t *zio) 3066b24ab676SJeff Bonwick { 3067b24ab676SJeff Bonwick dbuf_dirty_record_t *dr = zio->io_private; 3068b24ab676SJeff Bonwick dmu_buf_impl_t *db = dr->dr_dbuf; 3069b24ab676SJeff Bonwick 3070b24ab676SJeff Bonwick dbuf_write_ready(zio, NULL, db); 3071b24ab676SJeff Bonwick } 3072b24ab676SJeff Bonwick 3073b24ab676SJeff Bonwick static void 3074b24ab676SJeff Bonwick dbuf_write_override_done(zio_t *zio) 3075b24ab676SJeff Bonwick { 3076b24ab676SJeff Bonwick dbuf_dirty_record_t *dr = zio->io_private; 3077b24ab676SJeff Bonwick dmu_buf_impl_t *db = dr->dr_dbuf; 3078b24ab676SJeff Bonwick blkptr_t *obp = &dr->dt.dl.dr_overridden_by; 3079b24ab676SJeff Bonwick 3080b24ab676SJeff Bonwick mutex_enter(&db->db_mtx); 3081b24ab676SJeff Bonwick if (!BP_EQUAL(zio->io_bp, obp)) { 3082b24ab676SJeff Bonwick if (!BP_IS_HOLE(obp)) 3083b24ab676SJeff Bonwick dsl_free(spa_get_dsl(zio->io_spa), zio->io_txg, obp); 3084b24ab676SJeff Bonwick arc_release(dr->dt.dl.dr_data, db); 3085b24ab676SJeff Bonwick } 3086c717a561Smaybee mutex_exit(&db->db_mtx); 3087c717a561Smaybee 3088b24ab676SJeff Bonwick dbuf_write_done(zio, NULL, db); 3089b24ab676SJeff Bonwick } 3090c717a561Smaybee 30913e30c24aSWill Andrews /* Issue I/O to commit a dirty buffer to disk. */ 3092b24ab676SJeff Bonwick static void 3093b24ab676SJeff Bonwick dbuf_write(dbuf_dirty_record_t *dr, arc_buf_t *data, dmu_tx_t *tx) 3094b24ab676SJeff Bonwick { 3095b24ab676SJeff Bonwick dmu_buf_impl_t *db = dr->dr_dbuf; 3096744947dcSTom Erickson dnode_t *dn; 3097744947dcSTom Erickson objset_t *os; 3098b24ab676SJeff Bonwick dmu_buf_impl_t *parent = db->db_parent; 3099b24ab676SJeff Bonwick uint64_t txg = tx->tx_txg; 31007802d7bfSMatthew Ahrens zbookmark_phys_t zb; 3101b24ab676SJeff Bonwick zio_prop_t zp; 3102b24ab676SJeff Bonwick zio_t *zio; 31030a586ceaSMark Shellenbaum int wp_flag = 0; 3104b24ab676SJeff Bonwick 3105744947dcSTom Erickson DB_DNODE_ENTER(db); 3106744947dcSTom Erickson dn = DB_DNODE(db); 3107744947dcSTom Erickson os = dn->dn_objset; 3108744947dcSTom Erickson 3109b24ab676SJeff Bonwick if (db->db_state != DB_NOFILL) { 3110b24ab676SJeff Bonwick if (db->db_level > 0 || dn->dn_type == DMU_OT_DNODE) { 3111b24ab676SJeff Bonwick /* 3112b24ab676SJeff Bonwick * Private object buffers are released here rather 3113b24ab676SJeff Bonwick * than in dbuf_dirty() since they are only modified 3114b24ab676SJeff Bonwick * in the syncing context and we don't want the 3115b24ab676SJeff Bonwick * overhead of making multiple copies of the data. 3116b24ab676SJeff Bonwick */ 3117b24ab676SJeff Bonwick if (BP_IS_HOLE(db->db_blkptr)) { 3118b24ab676SJeff Bonwick arc_buf_thaw(data); 3119b24ab676SJeff Bonwick } else { 31203f9d6ad7SLin Ling dbuf_release_bp(db); 3121b24ab676SJeff Bonwick } 3122b24ab676SJeff Bonwick } 3123b24ab676SJeff Bonwick } 3124b24ab676SJeff Bonwick 3125b24ab676SJeff Bonwick if (parent != dn->dn_dbuf) { 31263e30c24aSWill Andrews /* Our parent is an indirect block. */ 31273e30c24aSWill Andrews /* We have a dirty parent that has been scheduled for write. */ 3128b24ab676SJeff Bonwick ASSERT(parent && parent->db_data_pending); 31293e30c24aSWill Andrews /* Our parent's buffer is one level closer to the dnode. */ 3130b24ab676SJeff Bonwick ASSERT(db->db_level == parent->db_level-1); 31313e30c24aSWill Andrews /* 31323e30c24aSWill Andrews * We're about to modify our parent's db_data by modifying 31333e30c24aSWill Andrews * our block pointer, so the parent must be released. 31343e30c24aSWill Andrews */ 3135b24ab676SJeff Bonwick ASSERT(arc_released(parent->db_buf)); 3136b24ab676SJeff Bonwick zio = parent->db_data_pending->dr_zio; 3137b24ab676SJeff Bonwick } else { 31383e30c24aSWill Andrews /* Our parent is the dnode itself. */ 31390a586ceaSMark Shellenbaum ASSERT((db->db_level == dn->dn_phys->dn_nlevels-1 && 31400a586ceaSMark Shellenbaum db->db_blkid != DMU_SPILL_BLKID) || 31410a586ceaSMark Shellenbaum (db->db_blkid == DMU_SPILL_BLKID && db->db_level == 0)); 31420a586ceaSMark Shellenbaum if (db->db_blkid != DMU_SPILL_BLKID) 3143b24ab676SJeff Bonwick ASSERT3P(db->db_blkptr, ==, 3144b24ab676SJeff Bonwick &dn->dn_phys->dn_blkptr[db->db_blkid]); 3145b24ab676SJeff Bonwick zio = dn->dn_zio; 3146b24ab676SJeff Bonwick } 3147b24ab676SJeff Bonwick 3148b24ab676SJeff Bonwick ASSERT(db->db_level == 0 || data == db->db_buf); 3149b24ab676SJeff Bonwick ASSERT3U(db->db_blkptr->blk_birth, <=, txg); 3150b24ab676SJeff Bonwick ASSERT(zio); 3151b24ab676SJeff Bonwick 3152b24ab676SJeff Bonwick SET_BOOKMARK(&zb, os->os_dsl_dataset ? 3153b24ab676SJeff Bonwick os->os_dsl_dataset->ds_object : DMU_META_OBJSET, 3154b24ab676SJeff Bonwick db->db.db_object, db->db_level, db->db_blkid); 3155b24ab676SJeff Bonwick 31560a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) 31570a586ceaSMark Shellenbaum wp_flag = WP_SPILL; 31580a586ceaSMark Shellenbaum wp_flag |= (db->db_state == DB_NOFILL) ? WP_NOFILL : 0; 31590a586ceaSMark Shellenbaum 31600a586ceaSMark Shellenbaum dmu_write_policy(os, dn, db->db_level, wp_flag, &zp); 3161744947dcSTom Erickson DB_DNODE_EXIT(db); 3162b24ab676SJeff Bonwick 31635d7b4d43SMatthew Ahrens if (db->db_level == 0 && 31645d7b4d43SMatthew Ahrens dr->dt.dl.dr_override_state == DR_OVERRIDDEN) { 31655d7b4d43SMatthew Ahrens /* 31665d7b4d43SMatthew Ahrens * The BP for this block has been provided by open context 31675d7b4d43SMatthew Ahrens * (by dmu_sync() or dmu_buf_write_embedded()). 31685d7b4d43SMatthew Ahrens */ 31695d7b4d43SMatthew Ahrens void *contents = (data != NULL) ? data->b_data : NULL; 31705d7b4d43SMatthew Ahrens 3171b24ab676SJeff Bonwick dr->dr_zio = zio_write(zio, os->os_spa, txg, 31725d7b4d43SMatthew Ahrens db->db_blkptr, contents, db->db.db_size, &zp, 317369962b56SMatthew Ahrens dbuf_write_override_ready, NULL, dbuf_write_override_done, 317469962b56SMatthew Ahrens dr, ZIO_PRIORITY_ASYNC_WRITE, ZIO_FLAG_MUSTSUCCEED, &zb); 3175b24ab676SJeff Bonwick mutex_enter(&db->db_mtx); 3176b24ab676SJeff Bonwick dr->dt.dl.dr_override_state = DR_NOT_OVERRIDDEN; 3177b24ab676SJeff Bonwick zio_write_override(dr->dr_zio, &dr->dt.dl.dr_overridden_by, 317880901aeaSGeorge Wilson dr->dt.dl.dr_copies, dr->dt.dl.dr_nopwrite); 3179b24ab676SJeff Bonwick mutex_exit(&db->db_mtx); 3180b24ab676SJeff Bonwick } else if (db->db_state == DB_NOFILL) { 3181810e43b2SBill Pijewski ASSERT(zp.zp_checksum == ZIO_CHECKSUM_OFF || 3182810e43b2SBill Pijewski zp.zp_checksum == ZIO_CHECKSUM_NOPARITY); 3183b24ab676SJeff Bonwick dr->dr_zio = zio_write(zio, os->os_spa, txg, 3184b24ab676SJeff Bonwick db->db_blkptr, NULL, db->db.db_size, &zp, 318569962b56SMatthew Ahrens dbuf_write_nofill_ready, NULL, dbuf_write_nofill_done, db, 3186b24ab676SJeff Bonwick ZIO_PRIORITY_ASYNC_WRITE, 3187b24ab676SJeff Bonwick ZIO_FLAG_MUSTSUCCEED | ZIO_FLAG_NODATA, &zb); 3188b24ab676SJeff Bonwick } else { 3189b24ab676SJeff Bonwick ASSERT(arc_released(data)); 3190b24ab676SJeff Bonwick dr->dr_zio = arc_write(zio, os->os_spa, txg, 3191aad02571SSaso Kiselkov db->db_blkptr, data, DBUF_IS_L2CACHEABLE(db), 3192aad02571SSaso Kiselkov DBUF_IS_L2COMPRESSIBLE(db), &zp, dbuf_write_ready, 319369962b56SMatthew Ahrens dbuf_write_physdone, dbuf_write_done, db, 319469962b56SMatthew Ahrens ZIO_PRIORITY_ASYNC_WRITE, ZIO_FLAG_MUSTSUCCEED, &zb); 3195b24ab676SJeff Bonwick } 3196fa9e4066Sahrens } 3197