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. 24bf16b11eSMatthew Ahrens * Copyright (c) 2012, 2014 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 * 128*e57a022bSJustin 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 150*e57a022bSJustin T. Gibbs static dmu_buf_impl_t * 151*e57a022bSJustin T. Gibbs dbuf_find_bonus(objset_t *os, uint64_t object) 152*e57a022bSJustin T. Gibbs { 153*e57a022bSJustin T. Gibbs dnode_t *dn; 154*e57a022bSJustin T. Gibbs dmu_buf_impl_t *db = NULL; 155*e57a022bSJustin T. Gibbs 156*e57a022bSJustin T. Gibbs if (dnode_hold(os, object, FTAG, &dn) == 0) { 157*e57a022bSJustin T. Gibbs rw_enter(&dn->dn_struct_rwlock, RW_READER); 158*e57a022bSJustin T. Gibbs if (dn->dn_bonus != NULL) { 159*e57a022bSJustin T. Gibbs db = dn->dn_bonus; 160*e57a022bSJustin T. Gibbs mutex_enter(&db->db_mtx); 161*e57a022bSJustin T. Gibbs } 162*e57a022bSJustin T. Gibbs rw_exit(&dn->dn_struct_rwlock); 163*e57a022bSJustin T. Gibbs dnode_rele(dn, FTAG); 164*e57a022bSJustin T. Gibbs } 165*e57a022bSJustin T. Gibbs return (db); 166*e57a022bSJustin T. Gibbs } 167*e57a022bSJustin 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 551fa9e4066Sahrens uint64_t 552fa9e4066Sahrens dbuf_whichblock(dnode_t *dn, uint64_t offset) 553fa9e4066Sahrens { 554fa9e4066Sahrens if (dn->dn_datablkshift) { 555fa9e4066Sahrens return (offset >> dn->dn_datablkshift); 556fa9e4066Sahrens } else { 557fa9e4066Sahrens ASSERT3U(offset, <, dn->dn_datablksz); 558fa9e4066Sahrens return (0); 559fa9e4066Sahrens } 560fa9e4066Sahrens } 561fa9e4066Sahrens 562fa9e4066Sahrens static void 563fa9e4066Sahrens dbuf_read_done(zio_t *zio, arc_buf_t *buf, void *vdb) 564fa9e4066Sahrens { 565fa9e4066Sahrens dmu_buf_impl_t *db = vdb; 566fa9e4066Sahrens 567fa9e4066Sahrens mutex_enter(&db->db_mtx); 568fa9e4066Sahrens ASSERT3U(db->db_state, ==, DB_READ); 569fa9e4066Sahrens /* 570fa9e4066Sahrens * All reads are synchronous, so we must have a hold on the dbuf 571fa9e4066Sahrens */ 572fa9e4066Sahrens ASSERT(refcount_count(&db->db_holds) > 0); 573ea8dc4b6Seschrock ASSERT(db->db_buf == NULL); 574fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 575c717a561Smaybee if (db->db_level == 0 && db->db_freed_in_flight) { 576fa9e4066Sahrens /* we were freed in flight; disregard any error */ 577fa9e4066Sahrens arc_release(buf, db); 578fa9e4066Sahrens bzero(buf->b_data, db->db.db_size); 5796b4acc8bSahrens arc_buf_freeze(buf); 580c717a561Smaybee db->db_freed_in_flight = FALSE; 581fa9e4066Sahrens dbuf_set_data(db, buf); 582fa9e4066Sahrens db->db_state = DB_CACHED; 583fa9e4066Sahrens } else if (zio == NULL || zio->io_error == 0) { 584fa9e4066Sahrens dbuf_set_data(db, buf); 585fa9e4066Sahrens db->db_state = DB_CACHED; 586fa9e4066Sahrens } else { 5870a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 588fa9e4066Sahrens ASSERT3P(db->db_buf, ==, NULL); 5893b2aab18SMatthew Ahrens VERIFY(arc_buf_remove_ref(buf, db)); 590ea8dc4b6Seschrock db->db_state = DB_UNCACHED; 591fa9e4066Sahrens } 592fa9e4066Sahrens cv_broadcast(&db->db_changed); 5933f9d6ad7SLin Ling dbuf_rele_and_unlock(db, NULL); 594fa9e4066Sahrens } 595fa9e4066Sahrens 596ea8dc4b6Seschrock static void 59713506d1eSmaybee dbuf_read_impl(dmu_buf_impl_t *db, zio_t *zio, uint32_t *flags) 598fa9e4066Sahrens { 599744947dcSTom Erickson dnode_t *dn; 6007802d7bfSMatthew Ahrens zbookmark_phys_t zb; 6017adb730bSGeorge Wilson arc_flags_t aflags = ARC_FLAG_NOWAIT; 602fa9e4066Sahrens 603744947dcSTom Erickson DB_DNODE_ENTER(db); 604744947dcSTom Erickson dn = DB_DNODE(db); 605fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 606fa9e4066Sahrens /* We need the struct_rwlock to prevent db_blkptr from changing. */ 607088f3894Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 608ea8dc4b6Seschrock ASSERT(MUTEX_HELD(&db->db_mtx)); 609ea8dc4b6Seschrock ASSERT(db->db_state == DB_UNCACHED); 610ea8dc4b6Seschrock ASSERT(db->db_buf == NULL); 611fa9e4066Sahrens 6120a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 613cf04dda1SMark Maybee int bonuslen = MIN(dn->dn_bonuslen, dn->dn_phys->dn_bonuslen); 6141934e92fSmaybee 6151934e92fSmaybee ASSERT3U(bonuslen, <=, db->db.db_size); 616ea8dc4b6Seschrock db->db.db_data = zio_buf_alloc(DN_MAX_BONUSLEN); 6175a98e54bSBrendan Gregg - Sun Microsystems arc_space_consume(DN_MAX_BONUSLEN, ARC_SPACE_OTHER); 6181934e92fSmaybee if (bonuslen < DN_MAX_BONUSLEN) 619ea8dc4b6Seschrock bzero(db->db.db_data, DN_MAX_BONUSLEN); 620cf04dda1SMark Maybee if (bonuslen) 621cf04dda1SMark Maybee bcopy(DN_BONUS(dn->dn_phys), db->db.db_data, bonuslen); 622744947dcSTom Erickson DB_DNODE_EXIT(db); 623fa9e4066Sahrens db->db_state = DB_CACHED; 624fa9e4066Sahrens mutex_exit(&db->db_mtx); 625fa9e4066Sahrens return; 626fa9e4066Sahrens } 627fa9e4066Sahrens 6281c8564a7SMark Maybee /* 6291c8564a7SMark Maybee * Recheck BP_IS_HOLE() after dnode_block_freed() in case dnode_sync() 6301c8564a7SMark Maybee * processes the delete record and clears the bp while we are waiting 6311c8564a7SMark Maybee * for the dn_mtx (resulting in a "no" from block_freed). 6321c8564a7SMark Maybee */ 633088f3894Sahrens if (db->db_blkptr == NULL || BP_IS_HOLE(db->db_blkptr) || 6341c8564a7SMark Maybee (db->db_level == 0 && (dnode_block_freed(dn, db->db_blkid) || 6351c8564a7SMark Maybee BP_IS_HOLE(db->db_blkptr)))) { 636ad23a2dbSjohansen arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 637ad23a2dbSjohansen 638744947dcSTom Erickson DB_DNODE_EXIT(db); 63943466aaeSMax Grossman dbuf_set_data(db, arc_buf_alloc(db->db_objset->os_spa, 64043466aaeSMax Grossman db->db.db_size, db, type)); 641fa9e4066Sahrens bzero(db->db.db_data, db->db.db_size); 642fa9e4066Sahrens db->db_state = DB_CACHED; 64313506d1eSmaybee *flags |= DB_RF_CACHED; 644fa9e4066Sahrens mutex_exit(&db->db_mtx); 645fa9e4066Sahrens return; 646fa9e4066Sahrens } 647fa9e4066Sahrens 648744947dcSTom Erickson DB_DNODE_EXIT(db); 649744947dcSTom Erickson 650fa9e4066Sahrens db->db_state = DB_READ; 651fa9e4066Sahrens mutex_exit(&db->db_mtx); 652fa9e4066Sahrens 6533baa08fcSek110237 if (DBUF_IS_L2CACHEABLE(db)) 6547adb730bSGeorge Wilson aflags |= ARC_FLAG_L2CACHE; 655aad02571SSaso Kiselkov if (DBUF_IS_L2COMPRESSIBLE(db)) 6567adb730bSGeorge Wilson aflags |= ARC_FLAG_L2COMPRESS; 6573baa08fcSek110237 658b24ab676SJeff Bonwick SET_BOOKMARK(&zb, db->db_objset->os_dsl_dataset ? 659b24ab676SJeff Bonwick db->db_objset->os_dsl_dataset->ds_object : DMU_META_OBJSET, 660b24ab676SJeff Bonwick db->db.db_object, db->db_level, db->db_blkid); 661ea8dc4b6Seschrock 662ea8dc4b6Seschrock dbuf_add_ref(db, NULL); 663088f3894Sahrens 66443466aaeSMax Grossman (void) arc_read(zio, db->db_objset->os_spa, db->db_blkptr, 665fa9e4066Sahrens dbuf_read_done, db, ZIO_PRIORITY_SYNC_READ, 66613506d1eSmaybee (*flags & DB_RF_CANFAIL) ? ZIO_FLAG_CANFAIL : ZIO_FLAG_MUSTSUCCEED, 66713506d1eSmaybee &aflags, &zb); 6687adb730bSGeorge Wilson if (aflags & ARC_FLAG_CACHED) 66913506d1eSmaybee *flags |= DB_RF_CACHED; 670fa9e4066Sahrens } 671fa9e4066Sahrens 672ea8dc4b6Seschrock int 673ea8dc4b6Seschrock dbuf_read(dmu_buf_impl_t *db, zio_t *zio, uint32_t flags) 674fa9e4066Sahrens { 675ea8dc4b6Seschrock int err = 0; 67643466aaeSMax Grossman boolean_t havepzio = (zio != NULL); 67743466aaeSMax Grossman boolean_t prefetch; 678744947dcSTom Erickson dnode_t *dn; 679fa9e4066Sahrens 680fa9e4066Sahrens /* 681fa9e4066Sahrens * We don't have to hold the mutex to check db_state because it 682fa9e4066Sahrens * can't be freed while we have a hold on the buffer. 683fa9e4066Sahrens */ 684fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 685fa9e4066Sahrens 68682c9918fSTim Haley if (db->db_state == DB_NOFILL) 687be6fd75aSMatthew Ahrens return (SET_ERROR(EIO)); 68882c9918fSTim Haley 689744947dcSTom Erickson DB_DNODE_ENTER(db); 690744947dcSTom Erickson dn = DB_DNODE(db); 691fa9e4066Sahrens if ((flags & DB_RF_HAVESTRUCT) == 0) 692744947dcSTom Erickson rw_enter(&dn->dn_struct_rwlock, RW_READER); 693fa9e4066Sahrens 6940a586ceaSMark Shellenbaum prefetch = db->db_level == 0 && db->db_blkid != DMU_BONUS_BLKID && 695744947dcSTom Erickson (flags & DB_RF_NOPREFETCH) == 0 && dn != NULL && 6963baa08fcSek110237 DBUF_IS_CACHEABLE(db); 69713506d1eSmaybee 698fa9e4066Sahrens mutex_enter(&db->db_mtx); 699ea8dc4b6Seschrock if (db->db_state == DB_CACHED) { 700ea8dc4b6Seschrock mutex_exit(&db->db_mtx); 70113506d1eSmaybee if (prefetch) 702744947dcSTom Erickson dmu_zfetch(&dn->dn_zfetch, db->db.db_offset, 70313506d1eSmaybee db->db.db_size, TRUE); 704ea8dc4b6Seschrock if ((flags & DB_RF_HAVESTRUCT) == 0) 705744947dcSTom Erickson rw_exit(&dn->dn_struct_rwlock); 706744947dcSTom Erickson DB_DNODE_EXIT(db); 707ea8dc4b6Seschrock } else if (db->db_state == DB_UNCACHED) { 708744947dcSTom Erickson spa_t *spa = dn->dn_objset->os_spa; 709744947dcSTom Erickson 710744947dcSTom Erickson if (zio == NULL) 711744947dcSTom Erickson zio = zio_root(spa, NULL, NULL, ZIO_FLAG_CANFAIL); 71213506d1eSmaybee dbuf_read_impl(db, zio, &flags); 71313506d1eSmaybee 714ea8dc4b6Seschrock /* dbuf_read_impl has dropped db_mtx for us */ 715ea8dc4b6Seschrock 71613506d1eSmaybee if (prefetch) 717744947dcSTom Erickson dmu_zfetch(&dn->dn_zfetch, db->db.db_offset, 71813506d1eSmaybee db->db.db_size, flags & DB_RF_CACHED); 719ea8dc4b6Seschrock 720ea8dc4b6Seschrock if ((flags & DB_RF_HAVESTRUCT) == 0) 721744947dcSTom Erickson rw_exit(&dn->dn_struct_rwlock); 722744947dcSTom Erickson DB_DNODE_EXIT(db); 723ea8dc4b6Seschrock 724ea8dc4b6Seschrock if (!havepzio) 725ea8dc4b6Seschrock err = zio_wait(zio); 726ea8dc4b6Seschrock } else { 7273e30c24aSWill Andrews /* 7283e30c24aSWill Andrews * Another reader came in while the dbuf was in flight 7293e30c24aSWill Andrews * between UNCACHED and CACHED. Either a writer will finish 7303e30c24aSWill Andrews * writing the buffer (sending the dbuf to CACHED) or the 7313e30c24aSWill Andrews * first reader's request will reach the read_done callback 7323e30c24aSWill Andrews * and send the dbuf to CACHED. Otherwise, a failure 7333e30c24aSWill Andrews * occurred and the dbuf went to UNCACHED. 7343e30c24aSWill Andrews */ 73513506d1eSmaybee mutex_exit(&db->db_mtx); 73613506d1eSmaybee if (prefetch) 737744947dcSTom Erickson dmu_zfetch(&dn->dn_zfetch, db->db.db_offset, 73813506d1eSmaybee db->db.db_size, TRUE); 739ea8dc4b6Seschrock if ((flags & DB_RF_HAVESTRUCT) == 0) 740744947dcSTom Erickson rw_exit(&dn->dn_struct_rwlock); 741744947dcSTom Erickson DB_DNODE_EXIT(db); 74213506d1eSmaybee 7433e30c24aSWill Andrews /* Skip the wait per the caller's request. */ 74413506d1eSmaybee mutex_enter(&db->db_mtx); 745ea8dc4b6Seschrock if ((flags & DB_RF_NEVERWAIT) == 0) { 746ea8dc4b6Seschrock while (db->db_state == DB_READ || 747ea8dc4b6Seschrock db->db_state == DB_FILL) { 748fa9e4066Sahrens ASSERT(db->db_state == DB_READ || 749fa9e4066Sahrens (flags & DB_RF_HAVESTRUCT) == 0); 750f6164ad6SAdam H. Leventhal DTRACE_PROBE2(blocked__read, dmu_buf_impl_t *, 751f6164ad6SAdam H. Leventhal db, zio_t *, zio); 752fa9e4066Sahrens cv_wait(&db->db_changed, &db->db_mtx); 753fa9e4066Sahrens } 754ea8dc4b6Seschrock if (db->db_state == DB_UNCACHED) 755be6fd75aSMatthew Ahrens err = SET_ERROR(EIO); 756ea8dc4b6Seschrock } 757fa9e4066Sahrens mutex_exit(&db->db_mtx); 758fa9e4066Sahrens } 759fa9e4066Sahrens 760ea8dc4b6Seschrock ASSERT(err || havepzio || db->db_state == DB_CACHED); 761ea8dc4b6Seschrock return (err); 762fa9e4066Sahrens } 763fa9e4066Sahrens 764fa9e4066Sahrens static void 765fa9e4066Sahrens dbuf_noread(dmu_buf_impl_t *db) 766fa9e4066Sahrens { 767fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 7680a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 769fa9e4066Sahrens mutex_enter(&db->db_mtx); 770fa9e4066Sahrens while (db->db_state == DB_READ || db->db_state == DB_FILL) 771fa9e4066Sahrens cv_wait(&db->db_changed, &db->db_mtx); 772fa9e4066Sahrens if (db->db_state == DB_UNCACHED) { 773ad23a2dbSjohansen arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 77443466aaeSMax Grossman spa_t *spa = db->db_objset->os_spa; 775ad23a2dbSjohansen 776ea8dc4b6Seschrock ASSERT(db->db_buf == NULL); 777fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 778744947dcSTom Erickson dbuf_set_data(db, arc_buf_alloc(spa, db->db.db_size, db, type)); 779fa9e4066Sahrens db->db_state = DB_FILL; 78082c9918fSTim Haley } else if (db->db_state == DB_NOFILL) { 781bc9014e6SJustin Gibbs dbuf_clear_data(db); 782fa9e4066Sahrens } else { 783fa9e4066Sahrens ASSERT3U(db->db_state, ==, DB_CACHED); 784fa9e4066Sahrens } 785fa9e4066Sahrens mutex_exit(&db->db_mtx); 786fa9e4066Sahrens } 787fa9e4066Sahrens 788fa9e4066Sahrens /* 789fa9e4066Sahrens * This is our just-in-time copy function. It makes a copy of 790fa9e4066Sahrens * buffers, that have been modified in a previous transaction 791fa9e4066Sahrens * group, before we modify them in the current active group. 792fa9e4066Sahrens * 793fa9e4066Sahrens * This function is used in two places: when we are dirtying a 794fa9e4066Sahrens * buffer for the first time in a txg, and when we are freeing 795fa9e4066Sahrens * a range in a dnode that includes this buffer. 796fa9e4066Sahrens * 797fa9e4066Sahrens * Note that when we are called from dbuf_free_range() we do 798fa9e4066Sahrens * not put a hold on the buffer, we just traverse the active 799fa9e4066Sahrens * dbuf list for the dnode. 800fa9e4066Sahrens */ 801fa9e4066Sahrens static void 802fa9e4066Sahrens dbuf_fix_old_data(dmu_buf_impl_t *db, uint64_t txg) 803fa9e4066Sahrens { 804c717a561Smaybee dbuf_dirty_record_t *dr = db->db_last_dirty; 805fa9e4066Sahrens 806fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 807fa9e4066Sahrens ASSERT(db->db.db_data != NULL); 808c717a561Smaybee ASSERT(db->db_level == 0); 809c717a561Smaybee ASSERT(db->db.db_object != DMU_META_DNODE_OBJECT); 810fa9e4066Sahrens 8114d31c452Smaybee if (dr == NULL || 8124d31c452Smaybee (dr->dt.dl.dr_data != 8130a586ceaSMark Shellenbaum ((db->db_blkid == DMU_BONUS_BLKID) ? db->db.db_data : db->db_buf))) 814fa9e4066Sahrens return; 815fa9e4066Sahrens 816fa9e4066Sahrens /* 817c717a561Smaybee * If the last dirty record for this dbuf has not yet synced 818c717a561Smaybee * and its referencing the dbuf data, either: 819c717a561Smaybee * reset the reference to point to a new copy, 820c717a561Smaybee * or (if there a no active holders) 821c717a561Smaybee * just null out the current db_data pointer. 822fa9e4066Sahrens */ 823c717a561Smaybee ASSERT(dr->dr_txg >= txg - 2); 8240a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 825c717a561Smaybee /* Note that the data bufs here are zio_bufs */ 826c717a561Smaybee dr->dt.dl.dr_data = zio_buf_alloc(DN_MAX_BONUSLEN); 8275a98e54bSBrendan Gregg - Sun Microsystems arc_space_consume(DN_MAX_BONUSLEN, ARC_SPACE_OTHER); 828c717a561Smaybee bcopy(db->db.db_data, dr->dt.dl.dr_data, DN_MAX_BONUSLEN); 829c717a561Smaybee } else if (refcount_count(&db->db_holds) > db->db_dirtycnt) { 830ea8dc4b6Seschrock int size = db->db.db_size; 831c717a561Smaybee arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 83243466aaeSMax Grossman spa_t *spa = db->db_objset->os_spa; 833744947dcSTom Erickson 834744947dcSTom Erickson dr->dt.dl.dr_data = arc_buf_alloc(spa, size, db, type); 835c717a561Smaybee bcopy(db->db.db_data, dr->dt.dl.dr_data->b_data, size); 836fa9e4066Sahrens } else { 837bc9014e6SJustin Gibbs dbuf_clear_data(db); 838fa9e4066Sahrens } 839fa9e4066Sahrens } 840ea8dc4b6Seschrock 841fa9e4066Sahrens void 842c717a561Smaybee dbuf_unoverride(dbuf_dirty_record_t *dr) 843fa9e4066Sahrens { 844c717a561Smaybee dmu_buf_impl_t *db = dr->dr_dbuf; 845b24ab676SJeff Bonwick blkptr_t *bp = &dr->dt.dl.dr_overridden_by; 846c717a561Smaybee uint64_t txg = dr->dr_txg; 847c5c6ffa0Smaybee 848c717a561Smaybee ASSERT(MUTEX_HELD(&db->db_mtx)); 849c717a561Smaybee ASSERT(dr->dt.dl.dr_override_state != DR_IN_DMU_SYNC); 850c717a561Smaybee ASSERT(db->db_level == 0); 851c717a561Smaybee 8520a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID || 853c717a561Smaybee dr->dt.dl.dr_override_state == DR_NOT_OVERRIDDEN) 854c717a561Smaybee return; 855c717a561Smaybee 856b24ab676SJeff Bonwick ASSERT(db->db_data_pending != dr); 857b24ab676SJeff Bonwick 858fa9e4066Sahrens /* free this block */ 85943466aaeSMax Grossman if (!BP_IS_HOLE(bp) && !dr->dt.dl.dr_nopwrite) 86043466aaeSMax Grossman zio_free(db->db_objset->os_spa, txg, bp); 861b24ab676SJeff Bonwick 862c717a561Smaybee dr->dt.dl.dr_override_state = DR_NOT_OVERRIDDEN; 86380901aeaSGeorge Wilson dr->dt.dl.dr_nopwrite = B_FALSE; 86480901aeaSGeorge Wilson 8656b4acc8bSahrens /* 8666b4acc8bSahrens * Release the already-written buffer, so we leave it in 8676b4acc8bSahrens * a consistent dirty state. Note that all callers are 8686b4acc8bSahrens * modifying the buffer, so they will immediately do 8696b4acc8bSahrens * another (redundant) arc_release(). Therefore, leave 8706b4acc8bSahrens * the buf thawed to save the effort of freezing & 8716b4acc8bSahrens * immediately re-thawing it. 8726b4acc8bSahrens */ 873c717a561Smaybee arc_release(dr->dt.dl.dr_data, db); 874fa9e4066Sahrens } 875fa9e4066Sahrens 876cdb0ab79Smaybee /* 877cdb0ab79Smaybee * Evict (if its unreferenced) or clear (if its referenced) any level-0 878cdb0ab79Smaybee * data blocks in the free range, so that any future readers will find 87943466aaeSMax Grossman * empty blocks. 8802f3d8780SMatthew Ahrens * 8812f3d8780SMatthew Ahrens * This is a no-op if the dataset is in the middle of an incremental 8822f3d8780SMatthew Ahrens * receive; see comment below for details. 883cdb0ab79Smaybee */ 884fa9e4066Sahrens void 8850f6d88adSAlex Reece dbuf_free_range(dnode_t *dn, uint64_t start_blkid, uint64_t end_blkid, 8860f6d88adSAlex Reece dmu_tx_t *tx) 887fa9e4066Sahrens { 888bc9014e6SJustin Gibbs dmu_buf_impl_t db_search; 889bc9014e6SJustin Gibbs dmu_buf_impl_t *db, *db_next; 890fa9e4066Sahrens uint64_t txg = tx->tx_txg; 8910f6d88adSAlex Reece avl_index_t where; 892fa9e4066Sahrens 8930f6d88adSAlex Reece if (end_blkid > dn->dn_maxblkid && (end_blkid != DMU_SPILL_BLKID)) 8940f6d88adSAlex Reece end_blkid = dn->dn_maxblkid; 8950f6d88adSAlex Reece dprintf_dnode(dn, "start=%llu end=%llu\n", start_blkid, end_blkid); 8960f6d88adSAlex Reece 8970f6d88adSAlex Reece db_search.db_level = 0; 8980f6d88adSAlex Reece db_search.db_blkid = start_blkid; 89986bb58aeSAlex Reece db_search.db_state = DB_SEARCH; 9002f3d8780SMatthew Ahrens 901713d6c20SMatthew Ahrens mutex_enter(&dn->dn_dbufs_mtx); 9020f6d88adSAlex Reece if (start_blkid >= dn->dn_unlisted_l0_blkid) { 903713d6c20SMatthew Ahrens /* There can't be any dbufs in this range; no need to search. */ 9040f6d88adSAlex Reece #ifdef DEBUG 9050f6d88adSAlex Reece db = avl_find(&dn->dn_dbufs, &db_search, &where); 9060f6d88adSAlex Reece ASSERT3P(db, ==, NULL); 9070f6d88adSAlex Reece db = avl_nearest(&dn->dn_dbufs, where, AVL_AFTER); 9080f6d88adSAlex Reece ASSERT(db == NULL || db->db_level > 0); 9090f6d88adSAlex Reece #endif 910713d6c20SMatthew Ahrens mutex_exit(&dn->dn_dbufs_mtx); 9112f3d8780SMatthew Ahrens return; 912713d6c20SMatthew Ahrens } else if (dmu_objset_is_receiving(dn->dn_objset)) { 913713d6c20SMatthew Ahrens /* 914713d6c20SMatthew Ahrens * If we are receiving, we expect there to be no dbufs in 915713d6c20SMatthew Ahrens * the range to be freed, because receive modifies each 916713d6c20SMatthew Ahrens * block at most once, and in offset order. If this is 917713d6c20SMatthew Ahrens * not the case, it can lead to performance problems, 918713d6c20SMatthew Ahrens * so note that we unexpectedly took the slow path. 919713d6c20SMatthew Ahrens */ 920713d6c20SMatthew Ahrens atomic_inc_64(&zfs_free_range_recv_miss); 9212f3d8780SMatthew Ahrens } 9222f3d8780SMatthew Ahrens 9230f6d88adSAlex Reece db = avl_find(&dn->dn_dbufs, &db_search, &where); 9240f6d88adSAlex Reece ASSERT3P(db, ==, NULL); 9250f6d88adSAlex Reece db = avl_nearest(&dn->dn_dbufs, where, AVL_AFTER); 9260f6d88adSAlex Reece 9270f6d88adSAlex Reece for (; db != NULL; db = db_next) { 9280f6d88adSAlex Reece db_next = AVL_NEXT(&dn->dn_dbufs, db); 9290a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 930cdb0ab79Smaybee 9310f6d88adSAlex Reece if (db->db_level != 0 || db->db_blkid > end_blkid) { 9320f6d88adSAlex Reece break; 9330f6d88adSAlex Reece } 9340f6d88adSAlex Reece ASSERT3U(db->db_blkid, >=, start_blkid); 935fa9e4066Sahrens 936fa9e4066Sahrens /* found a level 0 buffer in the range */ 937fa9e4066Sahrens mutex_enter(&db->db_mtx); 9383b2aab18SMatthew Ahrens if (dbuf_undirty(db, tx)) { 9393b2aab18SMatthew Ahrens /* mutex has been dropped and dbuf destroyed */ 9403b2aab18SMatthew Ahrens continue; 9413b2aab18SMatthew Ahrens } 9423b2aab18SMatthew Ahrens 943ea8dc4b6Seschrock if (db->db_state == DB_UNCACHED || 94482c9918fSTim Haley db->db_state == DB_NOFILL || 945ea8dc4b6Seschrock db->db_state == DB_EVICTING) { 946fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 947fa9e4066Sahrens mutex_exit(&db->db_mtx); 948fa9e4066Sahrens continue; 949fa9e4066Sahrens } 950c543ec06Sahrens if (db->db_state == DB_READ || db->db_state == DB_FILL) { 951c543ec06Sahrens /* will be handled in dbuf_read_done or dbuf_rele */ 952c717a561Smaybee db->db_freed_in_flight = TRUE; 953fa9e4066Sahrens mutex_exit(&db->db_mtx); 954fa9e4066Sahrens continue; 955fa9e4066Sahrens } 956ea8dc4b6Seschrock if (refcount_count(&db->db_holds) == 0) { 957ea8dc4b6Seschrock ASSERT(db->db_buf); 958ea8dc4b6Seschrock dbuf_clear(db); 959ea8dc4b6Seschrock continue; 960ea8dc4b6Seschrock } 961c717a561Smaybee /* The dbuf is referenced */ 962fa9e4066Sahrens 963c717a561Smaybee if (db->db_last_dirty != NULL) { 964c717a561Smaybee dbuf_dirty_record_t *dr = db->db_last_dirty; 965c717a561Smaybee 966c717a561Smaybee if (dr->dr_txg == txg) { 967ea8dc4b6Seschrock /* 968c717a561Smaybee * This buffer is "in-use", re-adjust the file 969c717a561Smaybee * size to reflect that this buffer may 970c717a561Smaybee * contain new data when we sync. 971ea8dc4b6Seschrock */ 97206e0070dSMark Shellenbaum if (db->db_blkid != DMU_SPILL_BLKID && 97306e0070dSMark Shellenbaum db->db_blkid > dn->dn_maxblkid) 97444eda4d7Smaybee dn->dn_maxblkid = db->db_blkid; 975c717a561Smaybee dbuf_unoverride(dr); 976c717a561Smaybee } else { 977c717a561Smaybee /* 978c717a561Smaybee * This dbuf is not dirty in the open context. 979c717a561Smaybee * Either uncache it (if its not referenced in 980c717a561Smaybee * the open context) or reset its contents to 981c717a561Smaybee * empty. 982c717a561Smaybee */ 983c717a561Smaybee dbuf_fix_old_data(db, txg); 98444eda4d7Smaybee } 985c717a561Smaybee } 986c717a561Smaybee /* clear the contents if its cached */ 987ea8dc4b6Seschrock if (db->db_state == DB_CACHED) { 988ea8dc4b6Seschrock ASSERT(db->db.db_data != NULL); 989fa9e4066Sahrens arc_release(db->db_buf, db); 990fa9e4066Sahrens bzero(db->db.db_data, db->db.db_size); 9916b4acc8bSahrens arc_buf_freeze(db->db_buf); 992fa9e4066Sahrens } 993ea8dc4b6Seschrock 994fa9e4066Sahrens mutex_exit(&db->db_mtx); 995fa9e4066Sahrens } 996fa9e4066Sahrens mutex_exit(&dn->dn_dbufs_mtx); 997fa9e4066Sahrens } 998fa9e4066Sahrens 999fa9e4066Sahrens static int 10001934e92fSmaybee dbuf_block_freeable(dmu_buf_impl_t *db) 1001fa9e4066Sahrens { 1002fa9e4066Sahrens dsl_dataset_t *ds = db->db_objset->os_dsl_dataset; 1003fa9e4066Sahrens uint64_t birth_txg = 0; 1004fa9e4066Sahrens 1005fa9e4066Sahrens /* 1006fa9e4066Sahrens * We don't need any locking to protect db_blkptr: 1007c717a561Smaybee * If it's syncing, then db_last_dirty will be set 1008c717a561Smaybee * so we'll ignore db_blkptr. 100943466aaeSMax Grossman * 101043466aaeSMax Grossman * This logic ensures that only block births for 101143466aaeSMax Grossman * filled blocks are considered. 1012fa9e4066Sahrens */ 1013c717a561Smaybee ASSERT(MUTEX_HELD(&db->db_mtx)); 101443466aaeSMax Grossman if (db->db_last_dirty && (db->db_blkptr == NULL || 101543466aaeSMax Grossman !BP_IS_HOLE(db->db_blkptr))) { 1016c717a561Smaybee birth_txg = db->db_last_dirty->dr_txg; 101743466aaeSMax Grossman } else if (db->db_blkptr != NULL && !BP_IS_HOLE(db->db_blkptr)) { 1018fa9e4066Sahrens birth_txg = db->db_blkptr->blk_birth; 101943466aaeSMax Grossman } 1020fa9e4066Sahrens 1021837b568bSGeorge Wilson /* 102243466aaeSMax Grossman * If this block don't exist or is in a snapshot, it can't be freed. 1023837b568bSGeorge Wilson * Don't pass the bp to dsl_dataset_block_freeable() since we 1024837b568bSGeorge Wilson * are holding the db_mtx lock and might deadlock if we are 1025837b568bSGeorge Wilson * prefetching a dedup-ed block. 1026837b568bSGeorge Wilson */ 102743466aaeSMax Grossman if (birth_txg != 0) 10281934e92fSmaybee return (ds == NULL || 1029837b568bSGeorge Wilson dsl_dataset_block_freeable(ds, NULL, birth_txg)); 1030fa9e4066Sahrens else 103143466aaeSMax Grossman return (B_FALSE); 1032fa9e4066Sahrens } 1033fa9e4066Sahrens 1034fa9e4066Sahrens void 1035fa9e4066Sahrens dbuf_new_size(dmu_buf_impl_t *db, int size, dmu_tx_t *tx) 1036fa9e4066Sahrens { 1037fa9e4066Sahrens arc_buf_t *buf, *obuf; 1038fa9e4066Sahrens int osize = db->db.db_size; 1039ad23a2dbSjohansen arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 1040744947dcSTom Erickson dnode_t *dn; 1041fa9e4066Sahrens 10420a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 1043ea8dc4b6Seschrock 1044744947dcSTom Erickson DB_DNODE_ENTER(db); 1045744947dcSTom Erickson dn = DB_DNODE(db); 1046744947dcSTom Erickson 1047fa9e4066Sahrens /* XXX does *this* func really need the lock? */ 1048744947dcSTom Erickson ASSERT(RW_WRITE_HELD(&dn->dn_struct_rwlock)); 1049fa9e4066Sahrens 1050fa9e4066Sahrens /* 105143466aaeSMax Grossman * This call to dmu_buf_will_dirty() with the dn_struct_rwlock held 1052fa9e4066Sahrens * is OK, because there can be no other references to the db 1053fa9e4066Sahrens * when we are changing its size, so no concurrent DB_FILL can 1054fa9e4066Sahrens * be happening. 1055fa9e4066Sahrens */ 1056ea8dc4b6Seschrock /* 1057ea8dc4b6Seschrock * XXX we should be doing a dbuf_read, checking the return 1058ea8dc4b6Seschrock * value and returning that up to our callers 1059ea8dc4b6Seschrock */ 106043466aaeSMax Grossman dmu_buf_will_dirty(&db->db, tx); 1061fa9e4066Sahrens 1062fa9e4066Sahrens /* create the data buffer for the new block */ 1063744947dcSTom Erickson buf = arc_buf_alloc(dn->dn_objset->os_spa, size, db, type); 1064fa9e4066Sahrens 1065fa9e4066Sahrens /* copy old block data to the new block */ 1066fa9e4066Sahrens obuf = db->db_buf; 1067f65e61c0Sahrens bcopy(obuf->b_data, buf->b_data, MIN(osize, size)); 1068fa9e4066Sahrens /* zero the remainder */ 1069f65e61c0Sahrens if (size > osize) 1070fa9e4066Sahrens bzero((uint8_t *)buf->b_data + osize, size - osize); 1071fa9e4066Sahrens 1072fa9e4066Sahrens mutex_enter(&db->db_mtx); 1073fa9e4066Sahrens dbuf_set_data(db, buf); 10743b2aab18SMatthew Ahrens VERIFY(arc_buf_remove_ref(obuf, db)); 1075fa9e4066Sahrens db->db.db_size = size; 1076fa9e4066Sahrens 1077c717a561Smaybee if (db->db_level == 0) { 1078c717a561Smaybee ASSERT3U(db->db_last_dirty->dr_txg, ==, tx->tx_txg); 1079c717a561Smaybee db->db_last_dirty->dt.dl.dr_data = buf; 1080c717a561Smaybee } 1081fa9e4066Sahrens mutex_exit(&db->db_mtx); 1082fa9e4066Sahrens 1083744947dcSTom Erickson dnode_willuse_space(dn, size-osize, tx); 1084744947dcSTom Erickson DB_DNODE_EXIT(db); 1085fa9e4066Sahrens } 1086fa9e4066Sahrens 10873f9d6ad7SLin Ling void 10883f9d6ad7SLin Ling dbuf_release_bp(dmu_buf_impl_t *db) 10893f9d6ad7SLin Ling { 109043466aaeSMax Grossman objset_t *os = db->db_objset; 10913f9d6ad7SLin Ling 10923f9d6ad7SLin Ling ASSERT(dsl_pool_sync_context(dmu_objset_pool(os))); 10933f9d6ad7SLin Ling ASSERT(arc_released(os->os_phys_buf) || 10943f9d6ad7SLin Ling list_link_active(&os->os_dsl_dataset->ds_synced_link)); 10953f9d6ad7SLin Ling ASSERT(db->db_parent == NULL || arc_released(db->db_parent->db_buf)); 10963f9d6ad7SLin Ling 10971b912ec7SGeorge Wilson (void) arc_release(db->db_buf, db); 10983f9d6ad7SLin Ling } 10993f9d6ad7SLin Ling 1100c717a561Smaybee dbuf_dirty_record_t * 1101fa9e4066Sahrens dbuf_dirty(dmu_buf_impl_t *db, dmu_tx_t *tx) 1102fa9e4066Sahrens { 1103744947dcSTom Erickson dnode_t *dn; 1104744947dcSTom Erickson objset_t *os; 1105c717a561Smaybee dbuf_dirty_record_t **drp, *dr; 1106fa9e4066Sahrens int drop_struct_lock = FALSE; 1107d3469faaSMark Maybee boolean_t do_free_accounting = B_FALSE; 1108fa9e4066Sahrens int txgoff = tx->tx_txg & TXG_MASK; 1109fa9e4066Sahrens 1110fa9e4066Sahrens ASSERT(tx->tx_txg != 0); 1111fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 11129c9dc39aSek110237 DMU_TX_DIRTY_BUF(tx, db); 1113fa9e4066Sahrens 1114744947dcSTom Erickson DB_DNODE_ENTER(db); 1115744947dcSTom Erickson dn = DB_DNODE(db); 1116fa9e4066Sahrens /* 1117fa9e4066Sahrens * Shouldn't dirty a regular buffer in syncing context. Private 1118fa9e4066Sahrens * objects may be dirtied in syncing context, but only if they 1119fa9e4066Sahrens * were already pre-dirtied in open context. 1120fa9e4066Sahrens */ 1121c717a561Smaybee ASSERT(!dmu_tx_is_syncing(tx) || 1122c717a561Smaybee BP_IS_HOLE(dn->dn_objset->os_rootbp) || 112314843421SMatthew Ahrens DMU_OBJECT_IS_SPECIAL(dn->dn_object) || 112414843421SMatthew Ahrens dn->dn_objset->os_dsl_dataset == NULL); 1125fa9e4066Sahrens /* 1126fa9e4066Sahrens * We make this assert for private objects as well, but after we 1127fa9e4066Sahrens * check if we're already dirty. They are allowed to re-dirty 1128fa9e4066Sahrens * in syncing context. 1129fa9e4066Sahrens */ 1130ea8dc4b6Seschrock ASSERT(dn->dn_object == DMU_META_DNODE_OBJECT || 1131c717a561Smaybee dn->dn_dirtyctx == DN_UNDIRTIED || dn->dn_dirtyctx == 1132fa9e4066Sahrens (dmu_tx_is_syncing(tx) ? DN_DIRTY_SYNC : DN_DIRTY_OPEN)); 1133fa9e4066Sahrens 1134fa9e4066Sahrens mutex_enter(&db->db_mtx); 1135fa9e4066Sahrens /* 1136c717a561Smaybee * XXX make this true for indirects too? The problem is that 1137c717a561Smaybee * transactions created with dmu_tx_create_assigned() from 1138c717a561Smaybee * syncing context don't bother holding ahead. 1139fa9e4066Sahrens */ 1140c717a561Smaybee ASSERT(db->db_level != 0 || 114182c9918fSTim Haley db->db_state == DB_CACHED || db->db_state == DB_FILL || 114282c9918fSTim Haley db->db_state == DB_NOFILL); 1143fa9e4066Sahrens 1144fa9e4066Sahrens mutex_enter(&dn->dn_mtx); 1145fa9e4066Sahrens /* 1146fa9e4066Sahrens * Don't set dirtyctx to SYNC if we're just modifying this as we 1147fa9e4066Sahrens * initialize the objset. 1148fa9e4066Sahrens */ 1149fa9e4066Sahrens if (dn->dn_dirtyctx == DN_UNDIRTIED && 1150c717a561Smaybee !BP_IS_HOLE(dn->dn_objset->os_rootbp)) { 1151fa9e4066Sahrens dn->dn_dirtyctx = 1152fa9e4066Sahrens (dmu_tx_is_syncing(tx) ? DN_DIRTY_SYNC : DN_DIRTY_OPEN); 1153fa9e4066Sahrens ASSERT(dn->dn_dirtyctx_firstset == NULL); 1154fa9e4066Sahrens dn->dn_dirtyctx_firstset = kmem_alloc(1, KM_SLEEP); 1155fa9e4066Sahrens } 1156fa9e4066Sahrens mutex_exit(&dn->dn_mtx); 1157fa9e4066Sahrens 11580a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) 11590a586ceaSMark Shellenbaum dn->dn_have_spill = B_TRUE; 11600a586ceaSMark Shellenbaum 1161fa9e4066Sahrens /* 1162fa9e4066Sahrens * If this buffer is already dirty, we're done. 1163fa9e4066Sahrens */ 1164c717a561Smaybee drp = &db->db_last_dirty; 1165c717a561Smaybee ASSERT(*drp == NULL || (*drp)->dr_txg <= tx->tx_txg || 1166c717a561Smaybee db->db.db_object == DMU_META_DNODE_OBJECT); 11677e2186e3Sbonwick while ((dr = *drp) != NULL && dr->dr_txg > tx->tx_txg) 11687e2186e3Sbonwick drp = &dr->dr_next; 11697e2186e3Sbonwick if (dr && dr->dr_txg == tx->tx_txg) { 1170744947dcSTom Erickson DB_DNODE_EXIT(db); 1171744947dcSTom Erickson 11720a586ceaSMark Shellenbaum if (db->db_level == 0 && db->db_blkid != DMU_BONUS_BLKID) { 1173c717a561Smaybee /* 1174c717a561Smaybee * If this buffer has already been written out, 1175c717a561Smaybee * we now need to reset its state. 1176c717a561Smaybee */ 11777e2186e3Sbonwick dbuf_unoverride(dr); 1178b24ab676SJeff Bonwick if (db->db.db_object != DMU_META_DNODE_OBJECT && 1179b24ab676SJeff Bonwick db->db_state != DB_NOFILL) 11806b4acc8bSahrens arc_buf_thaw(db->db_buf); 1181c717a561Smaybee } 1182fa9e4066Sahrens mutex_exit(&db->db_mtx); 11837e2186e3Sbonwick return (dr); 1184fa9e4066Sahrens } 1185fa9e4066Sahrens 1186fa9e4066Sahrens /* 1187fa9e4066Sahrens * Only valid if not already dirty. 1188fa9e4066Sahrens */ 118914843421SMatthew Ahrens ASSERT(dn->dn_object == 0 || 119014843421SMatthew Ahrens dn->dn_dirtyctx == DN_UNDIRTIED || dn->dn_dirtyctx == 1191fa9e4066Sahrens (dmu_tx_is_syncing(tx) ? DN_DIRTY_SYNC : DN_DIRTY_OPEN)); 1192fa9e4066Sahrens 1193fa9e4066Sahrens ASSERT3U(dn->dn_nlevels, >, db->db_level); 1194fa9e4066Sahrens ASSERT((dn->dn_phys->dn_nlevels == 0 && db->db_level == 0) || 1195fa9e4066Sahrens dn->dn_phys->dn_nlevels > db->db_level || 1196fa9e4066Sahrens dn->dn_next_nlevels[txgoff] > db->db_level || 1197fa9e4066Sahrens dn->dn_next_nlevels[(tx->tx_txg-1) & TXG_MASK] > db->db_level || 1198fa9e4066Sahrens dn->dn_next_nlevels[(tx->tx_txg-2) & TXG_MASK] > db->db_level); 1199fa9e4066Sahrens 1200fa9e4066Sahrens /* 1201fa9e4066Sahrens * We should only be dirtying in syncing context if it's the 120214843421SMatthew Ahrens * mos or we're initializing the os or it's a special object. 120314843421SMatthew Ahrens * However, we are allowed to dirty in syncing context provided 120414843421SMatthew Ahrens * we already dirtied it in open context. Hence we must make 120514843421SMatthew Ahrens * this assertion only if we're not already dirty. 1206fa9e4066Sahrens */ 1207744947dcSTom Erickson os = dn->dn_objset; 120814843421SMatthew Ahrens ASSERT(!dmu_tx_is_syncing(tx) || DMU_OBJECT_IS_SPECIAL(dn->dn_object) || 120914843421SMatthew Ahrens os->os_dsl_dataset == NULL || BP_IS_HOLE(os->os_rootbp)); 1210fa9e4066Sahrens ASSERT(db->db.db_size != 0); 1211fa9e4066Sahrens 1212fa9e4066Sahrens dprintf_dbuf(db, "size=%llx\n", (u_longlong_t)db->db.db_size); 1213fa9e4066Sahrens 12140a586ceaSMark Shellenbaum if (db->db_blkid != DMU_BONUS_BLKID) { 12151934e92fSmaybee /* 12161934e92fSmaybee * Update the accounting. 1217d3469faaSMark Maybee * Note: we delay "free accounting" until after we drop 1218d3469faaSMark Maybee * the db_mtx. This keeps us from grabbing other locks 1219b24ab676SJeff Bonwick * (and possibly deadlocking) in bp_get_dsize() while 1220d3469faaSMark Maybee * also holding the db_mtx. 12211934e92fSmaybee */ 12221934e92fSmaybee dnode_willuse_space(dn, db->db.db_size, tx); 1223d3469faaSMark Maybee do_free_accounting = dbuf_block_freeable(db); 12241934e92fSmaybee } 12251934e92fSmaybee 1226ea8dc4b6Seschrock /* 1227ea8dc4b6Seschrock * If this buffer is dirty in an old transaction group we need 1228ea8dc4b6Seschrock * to make a copy of it so that the changes we make in this 1229ea8dc4b6Seschrock * transaction group won't leak out when we sync the older txg. 1230ea8dc4b6Seschrock */ 1231c717a561Smaybee dr = kmem_zalloc(sizeof (dbuf_dirty_record_t), KM_SLEEP); 1232c717a561Smaybee if (db->db_level == 0) { 1233c717a561Smaybee void *data_old = db->db_buf; 1234c717a561Smaybee 123582c9918fSTim Haley if (db->db_state != DB_NOFILL) { 12360a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 1237c717a561Smaybee dbuf_fix_old_data(db, tx->tx_txg); 1238c717a561Smaybee data_old = db->db.db_data; 1239c717a561Smaybee } else if (db->db.db_object != DMU_META_DNODE_OBJECT) { 1240fa9e4066Sahrens /* 124182c9918fSTim Haley * Release the data buffer from the cache so 124282c9918fSTim Haley * that we can modify it without impacting 124382c9918fSTim Haley * possible other users of this cached data 124482c9918fSTim Haley * block. Note that indirect blocks and 124582c9918fSTim Haley * private objects are not released until the 124682c9918fSTim Haley * syncing state (since they are only modified 124782c9918fSTim Haley * then). 1248fa9e4066Sahrens */ 1249fa9e4066Sahrens arc_release(db->db_buf, db); 1250fa9e4066Sahrens dbuf_fix_old_data(db, tx->tx_txg); 1251c717a561Smaybee data_old = db->db_buf; 1252fa9e4066Sahrens } 1253c717a561Smaybee ASSERT(data_old != NULL); 125482c9918fSTim Haley } 1255c717a561Smaybee dr->dt.dl.dr_data = data_old; 1256c717a561Smaybee } else { 1257c717a561Smaybee mutex_init(&dr->dt.di.dr_mtx, NULL, MUTEX_DEFAULT, NULL); 1258c717a561Smaybee list_create(&dr->dt.di.dr_children, 1259c717a561Smaybee sizeof (dbuf_dirty_record_t), 1260c717a561Smaybee offsetof(dbuf_dirty_record_t, dr_dirty_node)); 1261fa9e4066Sahrens } 126269962b56SMatthew Ahrens if (db->db_blkid != DMU_BONUS_BLKID && os->os_dsl_dataset != NULL) 126369962b56SMatthew Ahrens dr->dr_accounted = db->db.db_size; 1264c717a561Smaybee dr->dr_dbuf = db; 1265c717a561Smaybee dr->dr_txg = tx->tx_txg; 1266c717a561Smaybee dr->dr_next = *drp; 1267c717a561Smaybee *drp = dr; 1268fa9e4066Sahrens 1269fa9e4066Sahrens /* 1270fa9e4066Sahrens * We could have been freed_in_flight between the dbuf_noread 1271fa9e4066Sahrens * and dbuf_dirty. We win, as though the dbuf_noread() had 1272fa9e4066Sahrens * happened after the free. 1273fa9e4066Sahrens */ 12740a586ceaSMark Shellenbaum if (db->db_level == 0 && db->db_blkid != DMU_BONUS_BLKID && 12750a586ceaSMark Shellenbaum db->db_blkid != DMU_SPILL_BLKID) { 1276c717a561Smaybee mutex_enter(&dn->dn_mtx); 1277bf16b11eSMatthew Ahrens if (dn->dn_free_ranges[txgoff] != NULL) { 1278bf16b11eSMatthew Ahrens range_tree_clear(dn->dn_free_ranges[txgoff], 1279bf16b11eSMatthew Ahrens db->db_blkid, 1); 1280bf16b11eSMatthew Ahrens } 1281fa9e4066Sahrens mutex_exit(&dn->dn_mtx); 1282c717a561Smaybee db->db_freed_in_flight = FALSE; 1283c717a561Smaybee } 1284fa9e4066Sahrens 1285fa9e4066Sahrens /* 1286fa9e4066Sahrens * This buffer is now part of this txg 1287fa9e4066Sahrens */ 1288fa9e4066Sahrens dbuf_add_ref(db, (void *)(uintptr_t)tx->tx_txg); 1289fa9e4066Sahrens db->db_dirtycnt += 1; 1290fa9e4066Sahrens ASSERT3U(db->db_dirtycnt, <=, 3); 1291fa9e4066Sahrens 1292fa9e4066Sahrens mutex_exit(&db->db_mtx); 1293fa9e4066Sahrens 12940a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID || 12950a586ceaSMark Shellenbaum db->db_blkid == DMU_SPILL_BLKID) { 1296c717a561Smaybee mutex_enter(&dn->dn_mtx); 1297c717a561Smaybee ASSERT(!list_link_active(&dr->dr_dirty_node)); 1298c717a561Smaybee list_insert_tail(&dn->dn_dirty_records[txgoff], dr); 1299c717a561Smaybee mutex_exit(&dn->dn_mtx); 1300fa9e4066Sahrens dnode_setdirty(dn, tx); 1301744947dcSTom Erickson DB_DNODE_EXIT(db); 1302c717a561Smaybee return (dr); 1303d3469faaSMark Maybee } else if (do_free_accounting) { 1304d3469faaSMark Maybee blkptr_t *bp = db->db_blkptr; 1305d3469faaSMark Maybee int64_t willfree = (bp && !BP_IS_HOLE(bp)) ? 1306b24ab676SJeff Bonwick bp_get_dsize(os->os_spa, bp) : db->db.db_size; 1307d3469faaSMark Maybee /* 1308d3469faaSMark Maybee * This is only a guess -- if the dbuf is dirty 1309d3469faaSMark Maybee * in a previous txg, we don't know how much 1310d3469faaSMark Maybee * space it will use on disk yet. We should 1311d3469faaSMark Maybee * really have the struct_rwlock to access 1312d3469faaSMark Maybee * db_blkptr, but since this is just a guess, 1313d3469faaSMark Maybee * it's OK if we get an odd answer. 1314d3469faaSMark Maybee */ 1315837b568bSGeorge Wilson ddt_prefetch(os->os_spa, bp); 1316d3469faaSMark Maybee dnode_willuse_space(dn, -willfree, tx); 1317fa9e4066Sahrens } 1318fa9e4066Sahrens 1319fa9e4066Sahrens if (!RW_WRITE_HELD(&dn->dn_struct_rwlock)) { 1320fa9e4066Sahrens rw_enter(&dn->dn_struct_rwlock, RW_READER); 1321fa9e4066Sahrens drop_struct_lock = TRUE; 1322fa9e4066Sahrens } 1323fa9e4066Sahrens 13248346f03fSJonathan W Adams if (db->db_level == 0) { 13258346f03fSJonathan W Adams dnode_new_blkid(dn, db->db_blkid, tx, drop_struct_lock); 13268346f03fSJonathan W Adams ASSERT(dn->dn_maxblkid >= db->db_blkid); 13278346f03fSJonathan W Adams } 13288346f03fSJonathan W Adams 132944eda4d7Smaybee if (db->db_level+1 < dn->dn_nlevels) { 1330c717a561Smaybee dmu_buf_impl_t *parent = db->db_parent; 1331c717a561Smaybee dbuf_dirty_record_t *di; 1332c717a561Smaybee int parent_held = FALSE; 1333c717a561Smaybee 1334c717a561Smaybee if (db->db_parent == NULL || db->db_parent == dn->dn_dbuf) { 1335fa9e4066Sahrens int epbs = dn->dn_indblkshift - SPA_BLKPTRSHIFT; 1336c717a561Smaybee 1337fa9e4066Sahrens parent = dbuf_hold_level(dn, db->db_level+1, 1338fa9e4066Sahrens db->db_blkid >> epbs, FTAG); 133901025c89SJohn Harres ASSERT(parent != NULL); 1340c717a561Smaybee parent_held = TRUE; 1341c717a561Smaybee } 1342fa9e4066Sahrens if (drop_struct_lock) 1343fa9e4066Sahrens rw_exit(&dn->dn_struct_rwlock); 1344c717a561Smaybee ASSERT3U(db->db_level+1, ==, parent->db_level); 1345c717a561Smaybee di = dbuf_dirty(parent, tx); 1346c717a561Smaybee if (parent_held) 1347ea8dc4b6Seschrock dbuf_rele(parent, FTAG); 1348c717a561Smaybee 1349c717a561Smaybee mutex_enter(&db->db_mtx); 135069962b56SMatthew Ahrens /* 135169962b56SMatthew Ahrens * Since we've dropped the mutex, it's possible that 135269962b56SMatthew Ahrens * dbuf_undirty() might have changed this out from under us. 135369962b56SMatthew Ahrens */ 1354c717a561Smaybee if (db->db_last_dirty == dr || 1355c717a561Smaybee dn->dn_object == DMU_META_DNODE_OBJECT) { 1356c717a561Smaybee mutex_enter(&di->dt.di.dr_mtx); 1357c717a561Smaybee ASSERT3U(di->dr_txg, ==, tx->tx_txg); 1358c717a561Smaybee ASSERT(!list_link_active(&dr->dr_dirty_node)); 1359c717a561Smaybee list_insert_tail(&di->dt.di.dr_children, dr); 1360c717a561Smaybee mutex_exit(&di->dt.di.dr_mtx); 1361c717a561Smaybee dr->dr_parent = di; 1362c717a561Smaybee } 1363c717a561Smaybee mutex_exit(&db->db_mtx); 1364fa9e4066Sahrens } else { 1365c717a561Smaybee ASSERT(db->db_level+1 == dn->dn_nlevels); 1366c717a561Smaybee ASSERT(db->db_blkid < dn->dn_nblkptr); 1367744947dcSTom Erickson ASSERT(db->db_parent == NULL || db->db_parent == dn->dn_dbuf); 1368c717a561Smaybee mutex_enter(&dn->dn_mtx); 1369c717a561Smaybee ASSERT(!list_link_active(&dr->dr_dirty_node)); 1370c717a561Smaybee list_insert_tail(&dn->dn_dirty_records[txgoff], dr); 1371c717a561Smaybee mutex_exit(&dn->dn_mtx); 1372fa9e4066Sahrens if (drop_struct_lock) 1373fa9e4066Sahrens rw_exit(&dn->dn_struct_rwlock); 1374fa9e4066Sahrens } 1375fa9e4066Sahrens 1376fa9e4066Sahrens dnode_setdirty(dn, tx); 1377744947dcSTom Erickson DB_DNODE_EXIT(db); 1378c717a561Smaybee return (dr); 1379fa9e4066Sahrens } 1380fa9e4066Sahrens 13813b2aab18SMatthew Ahrens /* 13823e30c24aSWill Andrews * Undirty a buffer in the transaction group referenced by the given 13833e30c24aSWill Andrews * transaction. Return whether this evicted the dbuf. 13843b2aab18SMatthew Ahrens */ 13853b2aab18SMatthew Ahrens static boolean_t 1386fa9e4066Sahrens dbuf_undirty(dmu_buf_impl_t *db, dmu_tx_t *tx) 1387fa9e4066Sahrens { 1388744947dcSTom Erickson dnode_t *dn; 1389c717a561Smaybee uint64_t txg = tx->tx_txg; 139017f17c2dSbonwick dbuf_dirty_record_t *dr, **drp; 1391fa9e4066Sahrens 1392c717a561Smaybee ASSERT(txg != 0); 13930a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 13943b2aab18SMatthew Ahrens ASSERT0(db->db_level); 13953b2aab18SMatthew Ahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 1396fa9e4066Sahrens 1397fa9e4066Sahrens /* 1398fa9e4066Sahrens * If this buffer is not dirty, we're done. 1399fa9e4066Sahrens */ 140017f17c2dSbonwick for (drp = &db->db_last_dirty; (dr = *drp) != NULL; drp = &dr->dr_next) 1401c717a561Smaybee if (dr->dr_txg <= txg) 1402c717a561Smaybee break; 14033b2aab18SMatthew Ahrens if (dr == NULL || dr->dr_txg < txg) 14043b2aab18SMatthew Ahrens return (B_FALSE); 1405c717a561Smaybee ASSERT(dr->dr_txg == txg); 1406b24ab676SJeff Bonwick ASSERT(dr->dr_dbuf == db); 1407fa9e4066Sahrens 1408744947dcSTom Erickson DB_DNODE_ENTER(db); 1409744947dcSTom Erickson dn = DB_DNODE(db); 1410744947dcSTom Erickson 1411fa9e4066Sahrens dprintf_dbuf(db, "size=%llx\n", (u_longlong_t)db->db.db_size); 1412fa9e4066Sahrens 1413fa9e4066Sahrens ASSERT(db->db.db_size != 0); 1414fa9e4066Sahrens 141569962b56SMatthew Ahrens /* 141669962b56SMatthew Ahrens * Any space we accounted for in dp_dirty_* will be cleaned up by 141769962b56SMatthew Ahrens * dsl_pool_sync(). This is relatively rare so the discrepancy 141869962b56SMatthew Ahrens * is not a big deal. 141969962b56SMatthew Ahrens */ 1420fa9e4066Sahrens 142117f17c2dSbonwick *drp = dr->dr_next; 1422c717a561Smaybee 14233f2366c2SGordon Ross /* 14243f2366c2SGordon Ross * Note that there are three places in dbuf_dirty() 14253f2366c2SGordon Ross * where this dirty record may be put on a list. 14263f2366c2SGordon Ross * Make sure to do a list_remove corresponding to 14273f2366c2SGordon Ross * every one of those list_insert calls. 14283f2366c2SGordon Ross */ 1429c717a561Smaybee if (dr->dr_parent) { 1430c717a561Smaybee mutex_enter(&dr->dr_parent->dt.di.dr_mtx); 1431c717a561Smaybee list_remove(&dr->dr_parent->dt.di.dr_children, dr); 1432c717a561Smaybee mutex_exit(&dr->dr_parent->dt.di.dr_mtx); 14333f2366c2SGordon Ross } else if (db->db_blkid == DMU_SPILL_BLKID || 14343f2366c2SGordon Ross db->db_level+1 == dn->dn_nlevels) { 1435cdb0ab79Smaybee ASSERT(db->db_blkptr == NULL || db->db_parent == dn->dn_dbuf); 1436fa9e4066Sahrens mutex_enter(&dn->dn_mtx); 1437c717a561Smaybee list_remove(&dn->dn_dirty_records[txg & TXG_MASK], dr); 1438fa9e4066Sahrens mutex_exit(&dn->dn_mtx); 1439c717a561Smaybee } 1440744947dcSTom Erickson DB_DNODE_EXIT(db); 1441c717a561Smaybee 144282c9918fSTim Haley if (db->db_state != DB_NOFILL) { 1443c717a561Smaybee dbuf_unoverride(dr); 1444c717a561Smaybee 1445c717a561Smaybee ASSERT(db->db_buf != NULL); 1446c717a561Smaybee ASSERT(dr->dt.dl.dr_data != NULL); 1447c717a561Smaybee if (dr->dt.dl.dr_data != db->db_buf) 14483b2aab18SMatthew Ahrens VERIFY(arc_buf_remove_ref(dr->dt.dl.dr_data, db)); 1449c717a561Smaybee } 1450d2b3cbbdSJorgen Lundman 1451d2b3cbbdSJorgen Lundman if (db->db_level != 0) { 1452d2b3cbbdSJorgen Lundman mutex_destroy(&dr->dt.di.dr_mtx); 1453d2b3cbbdSJorgen Lundman list_destroy(&dr->dt.di.dr_children); 1454d2b3cbbdSJorgen Lundman } 1455d2b3cbbdSJorgen Lundman 1456c717a561Smaybee kmem_free(dr, sizeof (dbuf_dirty_record_t)); 1457fa9e4066Sahrens 1458fa9e4066Sahrens ASSERT(db->db_dirtycnt > 0); 1459fa9e4066Sahrens db->db_dirtycnt -= 1; 1460fa9e4066Sahrens 1461c717a561Smaybee if (refcount_remove(&db->db_holds, (void *)(uintptr_t)txg) == 0) { 1462ea8dc4b6Seschrock arc_buf_t *buf = db->db_buf; 1463fa9e4066Sahrens 1464b24ab676SJeff Bonwick ASSERT(db->db_state == DB_NOFILL || arc_released(buf)); 1465bc9014e6SJustin Gibbs dbuf_clear_data(db); 14663b2aab18SMatthew Ahrens VERIFY(arc_buf_remove_ref(buf, db)); 1467fa9e4066Sahrens dbuf_evict(db); 14683b2aab18SMatthew Ahrens return (B_TRUE); 1469fa9e4066Sahrens } 1470fa9e4066Sahrens 14713b2aab18SMatthew Ahrens return (B_FALSE); 1472fa9e4066Sahrens } 1473fa9e4066Sahrens 1474fa9e4066Sahrens void 147543466aaeSMax Grossman dmu_buf_will_dirty(dmu_buf_t *db_fake, dmu_tx_t *tx) 1476fa9e4066Sahrens { 147743466aaeSMax Grossman dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 14781ab7f2deSmaybee int rf = DB_RF_MUST_SUCCEED | DB_RF_NOPREFETCH; 1479fa9e4066Sahrens 1480fa9e4066Sahrens ASSERT(tx->tx_txg != 0); 1481fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 1482fa9e4066Sahrens 1483744947dcSTom Erickson DB_DNODE_ENTER(db); 1484744947dcSTom Erickson if (RW_WRITE_HELD(&DB_DNODE(db)->dn_struct_rwlock)) 1485fa9e4066Sahrens rf |= DB_RF_HAVESTRUCT; 1486744947dcSTom Erickson DB_DNODE_EXIT(db); 1487ea8dc4b6Seschrock (void) dbuf_read(db, NULL, rf); 1488c717a561Smaybee (void) dbuf_dirty(db, tx); 1489fa9e4066Sahrens } 1490fa9e4066Sahrens 1491fa9e4066Sahrens void 149282c9918fSTim Haley dmu_buf_will_not_fill(dmu_buf_t *db_fake, dmu_tx_t *tx) 149382c9918fSTim Haley { 149482c9918fSTim Haley dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 149582c9918fSTim Haley 149682c9918fSTim Haley db->db_state = DB_NOFILL; 149782c9918fSTim Haley 149882c9918fSTim Haley dmu_buf_will_fill(db_fake, tx); 149982c9918fSTim Haley } 150082c9918fSTim Haley 150182c9918fSTim Haley void 1502ea8dc4b6Seschrock dmu_buf_will_fill(dmu_buf_t *db_fake, dmu_tx_t *tx) 1503fa9e4066Sahrens { 1504ea8dc4b6Seschrock dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 1505ea8dc4b6Seschrock 15060a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 1507fa9e4066Sahrens ASSERT(tx->tx_txg != 0); 1508fa9e4066Sahrens ASSERT(db->db_level == 0); 1509fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 1510fa9e4066Sahrens 1511ea8dc4b6Seschrock ASSERT(db->db.db_object != DMU_META_DNODE_OBJECT || 1512fa9e4066Sahrens dmu_tx_private_ok(tx)); 1513fa9e4066Sahrens 1514fa9e4066Sahrens dbuf_noread(db); 1515c717a561Smaybee (void) dbuf_dirty(db, tx); 1516fa9e4066Sahrens } 1517fa9e4066Sahrens 1518fa9e4066Sahrens #pragma weak dmu_buf_fill_done = dbuf_fill_done 1519fa9e4066Sahrens /* ARGSUSED */ 1520fa9e4066Sahrens void 1521fa9e4066Sahrens dbuf_fill_done(dmu_buf_impl_t *db, dmu_tx_t *tx) 1522fa9e4066Sahrens { 1523fa9e4066Sahrens mutex_enter(&db->db_mtx); 15249c9dc39aSek110237 DBUF_VERIFY(db); 1525fa9e4066Sahrens 1526fa9e4066Sahrens if (db->db_state == DB_FILL) { 1527c717a561Smaybee if (db->db_level == 0 && db->db_freed_in_flight) { 15280a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 1529fa9e4066Sahrens /* we were freed while filling */ 1530fa9e4066Sahrens /* XXX dbuf_undirty? */ 1531fa9e4066Sahrens bzero(db->db.db_data, db->db.db_size); 1532c717a561Smaybee db->db_freed_in_flight = FALSE; 1533fa9e4066Sahrens } 1534fa9e4066Sahrens db->db_state = DB_CACHED; 1535fa9e4066Sahrens cv_broadcast(&db->db_changed); 1536fa9e4066Sahrens } 1537fa9e4066Sahrens mutex_exit(&db->db_mtx); 1538fa9e4066Sahrens } 1539fa9e4066Sahrens 15405d7b4d43SMatthew Ahrens void 15415d7b4d43SMatthew Ahrens dmu_buf_write_embedded(dmu_buf_t *dbuf, void *data, 15425d7b4d43SMatthew Ahrens bp_embedded_type_t etype, enum zio_compress comp, 15435d7b4d43SMatthew Ahrens int uncompressed_size, int compressed_size, int byteorder, 15445d7b4d43SMatthew Ahrens dmu_tx_t *tx) 15455d7b4d43SMatthew Ahrens { 15465d7b4d43SMatthew Ahrens dmu_buf_impl_t *db = (dmu_buf_impl_t *)dbuf; 15475d7b4d43SMatthew Ahrens struct dirty_leaf *dl; 15485d7b4d43SMatthew Ahrens dmu_object_type_t type; 15495d7b4d43SMatthew Ahrens 15505d7b4d43SMatthew Ahrens DB_DNODE_ENTER(db); 15515d7b4d43SMatthew Ahrens type = DB_DNODE(db)->dn_type; 15525d7b4d43SMatthew Ahrens DB_DNODE_EXIT(db); 15535d7b4d43SMatthew Ahrens 15545d7b4d43SMatthew Ahrens ASSERT0(db->db_level); 15555d7b4d43SMatthew Ahrens ASSERT(db->db_blkid != DMU_BONUS_BLKID); 15565d7b4d43SMatthew Ahrens 15575d7b4d43SMatthew Ahrens dmu_buf_will_not_fill(dbuf, tx); 15585d7b4d43SMatthew Ahrens 15595d7b4d43SMatthew Ahrens ASSERT3U(db->db_last_dirty->dr_txg, ==, tx->tx_txg); 15605d7b4d43SMatthew Ahrens dl = &db->db_last_dirty->dt.dl; 15615d7b4d43SMatthew Ahrens encode_embedded_bp_compressed(&dl->dr_overridden_by, 15625d7b4d43SMatthew Ahrens data, comp, uncompressed_size, compressed_size); 15635d7b4d43SMatthew Ahrens BPE_SET_ETYPE(&dl->dr_overridden_by, etype); 15645d7b4d43SMatthew Ahrens BP_SET_TYPE(&dl->dr_overridden_by, type); 15655d7b4d43SMatthew Ahrens BP_SET_LEVEL(&dl->dr_overridden_by, 0); 15665d7b4d43SMatthew Ahrens BP_SET_BYTEORDER(&dl->dr_overridden_by, byteorder); 15675d7b4d43SMatthew Ahrens 15685d7b4d43SMatthew Ahrens dl->dr_override_state = DR_OVERRIDDEN; 15695d7b4d43SMatthew Ahrens dl->dr_overridden_by.blk_birth = db->db_last_dirty->dr_txg; 15705d7b4d43SMatthew Ahrens } 15715d7b4d43SMatthew Ahrens 1572ea8dc4b6Seschrock /* 15732fdbea25SAleksandr Guzovskiy * Directly assign a provided arc buf to a given dbuf if it's not referenced 15742fdbea25SAleksandr Guzovskiy * by anybody except our caller. Otherwise copy arcbuf's contents to dbuf. 15752fdbea25SAleksandr Guzovskiy */ 15762fdbea25SAleksandr Guzovskiy void 15772fdbea25SAleksandr Guzovskiy dbuf_assign_arcbuf(dmu_buf_impl_t *db, arc_buf_t *buf, dmu_tx_t *tx) 15782fdbea25SAleksandr Guzovskiy { 15792fdbea25SAleksandr Guzovskiy ASSERT(!refcount_is_zero(&db->db_holds)); 15800a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 15812fdbea25SAleksandr Guzovskiy ASSERT(db->db_level == 0); 15822fdbea25SAleksandr Guzovskiy ASSERT(DBUF_GET_BUFC_TYPE(db) == ARC_BUFC_DATA); 15832fdbea25SAleksandr Guzovskiy ASSERT(buf != NULL); 15842fdbea25SAleksandr Guzovskiy ASSERT(arc_buf_size(buf) == db->db.db_size); 15852fdbea25SAleksandr Guzovskiy ASSERT(tx->tx_txg != 0); 15862fdbea25SAleksandr Guzovskiy 15872fdbea25SAleksandr Guzovskiy arc_return_buf(buf, db); 15882fdbea25SAleksandr Guzovskiy ASSERT(arc_released(buf)); 15892fdbea25SAleksandr Guzovskiy 15902fdbea25SAleksandr Guzovskiy mutex_enter(&db->db_mtx); 15912fdbea25SAleksandr Guzovskiy 15922fdbea25SAleksandr Guzovskiy while (db->db_state == DB_READ || db->db_state == DB_FILL) 15932fdbea25SAleksandr Guzovskiy cv_wait(&db->db_changed, &db->db_mtx); 15942fdbea25SAleksandr Guzovskiy 15952fdbea25SAleksandr Guzovskiy ASSERT(db->db_state == DB_CACHED || db->db_state == DB_UNCACHED); 15962fdbea25SAleksandr Guzovskiy 15972fdbea25SAleksandr Guzovskiy if (db->db_state == DB_CACHED && 15982fdbea25SAleksandr Guzovskiy refcount_count(&db->db_holds) - 1 > db->db_dirtycnt) { 15992fdbea25SAleksandr Guzovskiy mutex_exit(&db->db_mtx); 16002fdbea25SAleksandr Guzovskiy (void) dbuf_dirty(db, tx); 16012fdbea25SAleksandr Guzovskiy bcopy(buf->b_data, db->db.db_data, db->db.db_size); 16023b2aab18SMatthew Ahrens VERIFY(arc_buf_remove_ref(buf, db)); 1603c242f9a0Schunli zhang - Sun Microsystems - Irvine United States xuio_stat_wbuf_copied(); 16042fdbea25SAleksandr Guzovskiy return; 16052fdbea25SAleksandr Guzovskiy } 16062fdbea25SAleksandr Guzovskiy 1607c242f9a0Schunli zhang - Sun Microsystems - Irvine United States xuio_stat_wbuf_nocopy(); 16082fdbea25SAleksandr Guzovskiy if (db->db_state == DB_CACHED) { 16092fdbea25SAleksandr Guzovskiy dbuf_dirty_record_t *dr = db->db_last_dirty; 16102fdbea25SAleksandr Guzovskiy 16112fdbea25SAleksandr Guzovskiy ASSERT(db->db_buf != NULL); 16122fdbea25SAleksandr Guzovskiy if (dr != NULL && dr->dr_txg == tx->tx_txg) { 16132fdbea25SAleksandr Guzovskiy ASSERT(dr->dt.dl.dr_data == db->db_buf); 16142fdbea25SAleksandr Guzovskiy if (!arc_released(db->db_buf)) { 16152fdbea25SAleksandr Guzovskiy ASSERT(dr->dt.dl.dr_override_state == 16162fdbea25SAleksandr Guzovskiy DR_OVERRIDDEN); 16172fdbea25SAleksandr Guzovskiy arc_release(db->db_buf, db); 16182fdbea25SAleksandr Guzovskiy } 16192fdbea25SAleksandr Guzovskiy dr->dt.dl.dr_data = buf; 16203b2aab18SMatthew Ahrens VERIFY(arc_buf_remove_ref(db->db_buf, db)); 16212fdbea25SAleksandr Guzovskiy } else if (dr == NULL || dr->dt.dl.dr_data != db->db_buf) { 16222fdbea25SAleksandr Guzovskiy arc_release(db->db_buf, db); 16233b2aab18SMatthew Ahrens VERIFY(arc_buf_remove_ref(db->db_buf, db)); 16242fdbea25SAleksandr Guzovskiy } 16252fdbea25SAleksandr Guzovskiy db->db_buf = NULL; 16262fdbea25SAleksandr Guzovskiy } 16272fdbea25SAleksandr Guzovskiy ASSERT(db->db_buf == NULL); 16282fdbea25SAleksandr Guzovskiy dbuf_set_data(db, buf); 16292fdbea25SAleksandr Guzovskiy db->db_state = DB_FILL; 16302fdbea25SAleksandr Guzovskiy mutex_exit(&db->db_mtx); 16312fdbea25SAleksandr Guzovskiy (void) dbuf_dirty(db, tx); 163243466aaeSMax Grossman dmu_buf_fill_done(&db->db, tx); 16332fdbea25SAleksandr Guzovskiy } 16342fdbea25SAleksandr Guzovskiy 16352fdbea25SAleksandr Guzovskiy /* 1636ea8dc4b6Seschrock * "Clear" the contents of this dbuf. This will mark the dbuf 163769962b56SMatthew Ahrens * EVICTING and clear *most* of its references. Unfortunately, 1638ea8dc4b6Seschrock * when we are not holding the dn_dbufs_mtx, we can't clear the 1639ea8dc4b6Seschrock * entry in the dn_dbufs list. We have to wait until dbuf_destroy() 1640ea8dc4b6Seschrock * in this case. For callers from the DMU we will usually see: 1641bbfa8ea8SMatthew Ahrens * dbuf_clear()->arc_clear_callback()->dbuf_do_evict()->dbuf_destroy() 1642ea8dc4b6Seschrock * For the arc callback, we will usually see: 1643ea8dc4b6Seschrock * dbuf_do_evict()->dbuf_clear();dbuf_destroy() 1644ea8dc4b6Seschrock * Sometimes, though, we will get a mix of these two: 1645bbfa8ea8SMatthew Ahrens * DMU: dbuf_clear()->arc_clear_callback() 1646ea8dc4b6Seschrock * ARC: dbuf_do_evict()->dbuf_destroy() 1647bbfa8ea8SMatthew Ahrens * 1648bbfa8ea8SMatthew Ahrens * This routine will dissociate the dbuf from the arc, by calling 1649bbfa8ea8SMatthew Ahrens * arc_clear_callback(), but will not evict the data from the ARC. 1650ea8dc4b6Seschrock */ 1651ea8dc4b6Seschrock void 1652fa9e4066Sahrens dbuf_clear(dmu_buf_impl_t *db) 1653fa9e4066Sahrens { 1654744947dcSTom Erickson dnode_t *dn; 1655ea8dc4b6Seschrock dmu_buf_impl_t *parent = db->db_parent; 1656744947dcSTom Erickson dmu_buf_impl_t *dndb; 1657bbfa8ea8SMatthew Ahrens boolean_t dbuf_gone = B_FALSE; 1658fa9e4066Sahrens 1659fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 1660fa9e4066Sahrens ASSERT(refcount_is_zero(&db->db_holds)); 1661fa9e4066Sahrens 1662ea8dc4b6Seschrock dbuf_evict_user(db); 1663ea8dc4b6Seschrock 1664fa9e4066Sahrens if (db->db_state == DB_CACHED) { 1665ea8dc4b6Seschrock ASSERT(db->db.db_data != NULL); 16660a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 1667ea8dc4b6Seschrock zio_buf_free(db->db.db_data, DN_MAX_BONUSLEN); 16685a98e54bSBrendan Gregg - Sun Microsystems arc_space_return(DN_MAX_BONUSLEN, ARC_SPACE_OTHER); 16690e8c6158Smaybee } 1670fa9e4066Sahrens db->db.db_data = NULL; 1671fa9e4066Sahrens db->db_state = DB_UNCACHED; 1672fa9e4066Sahrens } 1673fa9e4066Sahrens 167482c9918fSTim Haley ASSERT(db->db_state == DB_UNCACHED || db->db_state == DB_NOFILL); 1675fa9e4066Sahrens ASSERT(db->db_data_pending == NULL); 1676fa9e4066Sahrens 1677ea8dc4b6Seschrock db->db_state = DB_EVICTING; 1678ea8dc4b6Seschrock db->db_blkptr = NULL; 1679ea8dc4b6Seschrock 1680744947dcSTom Erickson DB_DNODE_ENTER(db); 1681744947dcSTom Erickson dn = DB_DNODE(db); 1682744947dcSTom Erickson dndb = dn->dn_dbuf; 16830a586ceaSMark Shellenbaum if (db->db_blkid != DMU_BONUS_BLKID && MUTEX_HELD(&dn->dn_dbufs_mtx)) { 16840f6d88adSAlex Reece avl_remove(&dn->dn_dbufs, db); 1685640c1670SJosef 'Jeff' Sipek atomic_dec_32(&dn->dn_dbufs_count); 1686744947dcSTom Erickson membar_producer(); 1687744947dcSTom Erickson DB_DNODE_EXIT(db); 1688744947dcSTom Erickson /* 1689744947dcSTom Erickson * Decrementing the dbuf count means that the hold corresponding 1690744947dcSTom Erickson * to the removed dbuf is no longer discounted in dnode_move(), 1691744947dcSTom Erickson * so the dnode cannot be moved until after we release the hold. 1692744947dcSTom Erickson * The membar_producer() ensures visibility of the decremented 1693744947dcSTom Erickson * value in dnode_move(), since DB_DNODE_EXIT doesn't actually 1694744947dcSTom Erickson * release any lock. 1695744947dcSTom Erickson */ 1696ea8dc4b6Seschrock dnode_rele(dn, db); 1697744947dcSTom Erickson db->db_dnode_handle = NULL; 1698744947dcSTom Erickson } else { 1699744947dcSTom Erickson DB_DNODE_EXIT(db); 1700ea8dc4b6Seschrock } 1701ea8dc4b6Seschrock 1702ea8dc4b6Seschrock if (db->db_buf) 1703bbfa8ea8SMatthew Ahrens dbuf_gone = arc_clear_callback(db->db_buf); 1704ea8dc4b6Seschrock 1705ea8dc4b6Seschrock if (!dbuf_gone) 1706fa9e4066Sahrens mutex_exit(&db->db_mtx); 1707fa9e4066Sahrens 1708fa9e4066Sahrens /* 1709744947dcSTom Erickson * If this dbuf is referenced from an indirect dbuf, 1710fa9e4066Sahrens * decrement the ref count on the indirect dbuf. 1711fa9e4066Sahrens */ 1712c543ec06Sahrens if (parent && parent != dndb) 1713ea8dc4b6Seschrock dbuf_rele(parent, db); 1714fa9e4066Sahrens } 1715fa9e4066Sahrens 1716fa9e4066Sahrens static int 1717fa9e4066Sahrens dbuf_findbp(dnode_t *dn, int level, uint64_t blkid, int fail_sparse, 1718fa9e4066Sahrens dmu_buf_impl_t **parentp, blkptr_t **bpp) 1719fa9e4066Sahrens { 1720fa9e4066Sahrens int nlevels, epbs; 1721fa9e4066Sahrens 17220b69c2f0Sahrens *parentp = NULL; 17230b69c2f0Sahrens *bpp = NULL; 17240b69c2f0Sahrens 17250a586ceaSMark Shellenbaum ASSERT(blkid != DMU_BONUS_BLKID); 17260a586ceaSMark Shellenbaum 17270a586ceaSMark Shellenbaum if (blkid == DMU_SPILL_BLKID) { 17280a586ceaSMark Shellenbaum mutex_enter(&dn->dn_mtx); 172906e0070dSMark Shellenbaum if (dn->dn_have_spill && 173006e0070dSMark Shellenbaum (dn->dn_phys->dn_flags & DNODE_FLAG_SPILL_BLKPTR)) 17310a586ceaSMark Shellenbaum *bpp = &dn->dn_phys->dn_spill; 17320a586ceaSMark Shellenbaum else 17330a586ceaSMark Shellenbaum *bpp = NULL; 17340a586ceaSMark Shellenbaum dbuf_add_ref(dn->dn_dbuf, NULL); 17350a586ceaSMark Shellenbaum *parentp = dn->dn_dbuf; 17360a586ceaSMark Shellenbaum mutex_exit(&dn->dn_mtx); 17370a586ceaSMark Shellenbaum return (0); 17380a586ceaSMark Shellenbaum } 1739ea8dc4b6Seschrock 1740fa9e4066Sahrens if (dn->dn_phys->dn_nlevels == 0) 1741fa9e4066Sahrens nlevels = 1; 1742fa9e4066Sahrens else 1743fa9e4066Sahrens nlevels = dn->dn_phys->dn_nlevels; 1744fa9e4066Sahrens 1745fa9e4066Sahrens epbs = dn->dn_indblkshift - SPA_BLKPTRSHIFT; 1746fa9e4066Sahrens 1747fa9e4066Sahrens ASSERT3U(level * epbs, <, 64); 1748fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 1749ea8dc4b6Seschrock if (level >= nlevels || 1750fa9e4066Sahrens (blkid > (dn->dn_phys->dn_maxblkid >> (level * epbs)))) { 1751fa9e4066Sahrens /* the buffer has no parent yet */ 1752be6fd75aSMatthew Ahrens return (SET_ERROR(ENOENT)); 1753fa9e4066Sahrens } else if (level < nlevels-1) { 1754fa9e4066Sahrens /* this block is referenced from an indirect block */ 1755fa9e4066Sahrens int err = dbuf_hold_impl(dn, level+1, 1756fa9e4066Sahrens blkid >> epbs, fail_sparse, NULL, parentp); 1757fa9e4066Sahrens if (err) 1758fa9e4066Sahrens return (err); 1759ea8dc4b6Seschrock err = dbuf_read(*parentp, NULL, 1760ea8dc4b6Seschrock (DB_RF_HAVESTRUCT | DB_RF_NOPREFETCH | DB_RF_CANFAIL)); 1761c543ec06Sahrens if (err) { 1762c543ec06Sahrens dbuf_rele(*parentp, NULL); 1763c543ec06Sahrens *parentp = NULL; 1764c543ec06Sahrens return (err); 1765c543ec06Sahrens } 1766fa9e4066Sahrens *bpp = ((blkptr_t *)(*parentp)->db.db_data) + 1767fa9e4066Sahrens (blkid & ((1ULL << epbs) - 1)); 1768c543ec06Sahrens return (0); 1769fa9e4066Sahrens } else { 1770fa9e4066Sahrens /* the block is referenced from the dnode */ 1771fa9e4066Sahrens ASSERT3U(level, ==, nlevels-1); 1772fa9e4066Sahrens ASSERT(dn->dn_phys->dn_nblkptr == 0 || 1773fa9e4066Sahrens blkid < dn->dn_phys->dn_nblkptr); 1774c543ec06Sahrens if (dn->dn_dbuf) { 1775c543ec06Sahrens dbuf_add_ref(dn->dn_dbuf, NULL); 1776fa9e4066Sahrens *parentp = dn->dn_dbuf; 1777c543ec06Sahrens } 1778fa9e4066Sahrens *bpp = &dn->dn_phys->dn_blkptr[blkid]; 1779fa9e4066Sahrens return (0); 1780fa9e4066Sahrens } 1781fa9e4066Sahrens } 1782fa9e4066Sahrens 1783fa9e4066Sahrens static dmu_buf_impl_t * 1784fa9e4066Sahrens dbuf_create(dnode_t *dn, uint8_t level, uint64_t blkid, 1785fa9e4066Sahrens dmu_buf_impl_t *parent, blkptr_t *blkptr) 1786fa9e4066Sahrens { 1787503ad85cSMatthew Ahrens objset_t *os = dn->dn_objset; 1788fa9e4066Sahrens dmu_buf_impl_t *db, *odb; 1789fa9e4066Sahrens 1790fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 1791fa9e4066Sahrens ASSERT(dn->dn_type != DMU_OT_NONE); 1792fa9e4066Sahrens 1793fa9e4066Sahrens db = kmem_cache_alloc(dbuf_cache, KM_SLEEP); 1794fa9e4066Sahrens 1795fa9e4066Sahrens db->db_objset = os; 1796fa9e4066Sahrens db->db.db_object = dn->dn_object; 1797fa9e4066Sahrens db->db_level = level; 1798fa9e4066Sahrens db->db_blkid = blkid; 1799c717a561Smaybee db->db_last_dirty = NULL; 1800ea8dc4b6Seschrock db->db_dirtycnt = 0; 1801744947dcSTom Erickson db->db_dnode_handle = dn->dn_handle; 1802ea8dc4b6Seschrock db->db_parent = parent; 1803ea8dc4b6Seschrock db->db_blkptr = blkptr; 1804fa9e4066Sahrens 1805bc9014e6SJustin Gibbs db->db_user = NULL; 1806c717a561Smaybee db->db_immediate_evict = 0; 1807c717a561Smaybee db->db_freed_in_flight = 0; 1808ea8dc4b6Seschrock 18090a586ceaSMark Shellenbaum if (blkid == DMU_BONUS_BLKID) { 1810ea8dc4b6Seschrock ASSERT3P(parent, ==, dn->dn_dbuf); 18111934e92fSmaybee db->db.db_size = DN_MAX_BONUSLEN - 18121934e92fSmaybee (dn->dn_nblkptr-1) * sizeof (blkptr_t); 18131934e92fSmaybee ASSERT3U(db->db.db_size, >=, dn->dn_bonuslen); 18140a586ceaSMark Shellenbaum db->db.db_offset = DMU_BONUS_BLKID; 1815ea8dc4b6Seschrock db->db_state = DB_UNCACHED; 1816ea8dc4b6Seschrock /* the bonus dbuf is not placed in the hash table */ 18175a98e54bSBrendan Gregg - Sun Microsystems arc_space_consume(sizeof (dmu_buf_impl_t), ARC_SPACE_OTHER); 1818ea8dc4b6Seschrock return (db); 18190a586ceaSMark Shellenbaum } else if (blkid == DMU_SPILL_BLKID) { 18200a586ceaSMark Shellenbaum db->db.db_size = (blkptr != NULL) ? 18210a586ceaSMark Shellenbaum BP_GET_LSIZE(blkptr) : SPA_MINBLOCKSIZE; 18220a586ceaSMark Shellenbaum db->db.db_offset = 0; 1823fa9e4066Sahrens } else { 1824fa9e4066Sahrens int blocksize = 1825fa9e4066Sahrens db->db_level ? 1 << dn->dn_indblkshift : dn->dn_datablksz; 1826fa9e4066Sahrens db->db.db_size = blocksize; 1827fa9e4066Sahrens db->db.db_offset = db->db_blkid * blocksize; 1828fa9e4066Sahrens } 1829fa9e4066Sahrens 1830fa9e4066Sahrens /* 1831fa9e4066Sahrens * Hold the dn_dbufs_mtx while we get the new dbuf 1832fa9e4066Sahrens * in the hash table *and* added to the dbufs list. 1833fa9e4066Sahrens * This prevents a possible deadlock with someone 1834fa9e4066Sahrens * trying to look up this dbuf before its added to the 1835fa9e4066Sahrens * dn_dbufs list. 1836fa9e4066Sahrens */ 1837fa9e4066Sahrens mutex_enter(&dn->dn_dbufs_mtx); 1838ea8dc4b6Seschrock db->db_state = DB_EVICTING; 1839fa9e4066Sahrens if ((odb = dbuf_hash_insert(db)) != NULL) { 1840fa9e4066Sahrens /* someone else inserted it first */ 1841fa9e4066Sahrens kmem_cache_free(dbuf_cache, db); 1842fa9e4066Sahrens mutex_exit(&dn->dn_dbufs_mtx); 1843fa9e4066Sahrens return (odb); 1844fa9e4066Sahrens } 18450f6d88adSAlex Reece avl_add(&dn->dn_dbufs, db); 1846713d6c20SMatthew Ahrens if (db->db_level == 0 && db->db_blkid >= 1847713d6c20SMatthew Ahrens dn->dn_unlisted_l0_blkid) 1848713d6c20SMatthew Ahrens dn->dn_unlisted_l0_blkid = db->db_blkid + 1; 1849ea8dc4b6Seschrock db->db_state = DB_UNCACHED; 1850fa9e4066Sahrens mutex_exit(&dn->dn_dbufs_mtx); 18515a98e54bSBrendan Gregg - Sun Microsystems arc_space_consume(sizeof (dmu_buf_impl_t), ARC_SPACE_OTHER); 1852fa9e4066Sahrens 1853fa9e4066Sahrens if (parent && parent != dn->dn_dbuf) 1854fa9e4066Sahrens dbuf_add_ref(parent, db); 1855fa9e4066Sahrens 1856ea8dc4b6Seschrock ASSERT(dn->dn_object == DMU_META_DNODE_OBJECT || 1857ea8dc4b6Seschrock refcount_count(&dn->dn_holds) > 0); 1858fa9e4066Sahrens (void) refcount_add(&dn->dn_holds, db); 1859640c1670SJosef 'Jeff' Sipek atomic_inc_32(&dn->dn_dbufs_count); 1860fa9e4066Sahrens 1861fa9e4066Sahrens dprintf_dbuf(db, "db=%p\n", db); 1862fa9e4066Sahrens 1863fa9e4066Sahrens return (db); 1864fa9e4066Sahrens } 1865fa9e4066Sahrens 1866fa9e4066Sahrens static int 1867ea8dc4b6Seschrock dbuf_do_evict(void *private) 1868fa9e4066Sahrens { 1869bbfa8ea8SMatthew Ahrens dmu_buf_impl_t *db = private; 1870fa9e4066Sahrens 1871ea8dc4b6Seschrock if (!MUTEX_HELD(&db->db_mtx)) 1872ea8dc4b6Seschrock mutex_enter(&db->db_mtx); 1873ea8dc4b6Seschrock 1874ea8dc4b6Seschrock ASSERT(refcount_is_zero(&db->db_holds)); 1875ea8dc4b6Seschrock 1876ea8dc4b6Seschrock if (db->db_state != DB_EVICTING) { 1877ea8dc4b6Seschrock ASSERT(db->db_state == DB_CACHED); 18789c9dc39aSek110237 DBUF_VERIFY(db); 1879ea8dc4b6Seschrock db->db_buf = NULL; 1880ea8dc4b6Seschrock dbuf_evict(db); 1881ea8dc4b6Seschrock } else { 1882ea8dc4b6Seschrock mutex_exit(&db->db_mtx); 1883ea8dc4b6Seschrock dbuf_destroy(db); 1884fa9e4066Sahrens } 1885ea8dc4b6Seschrock return (0); 1886fa9e4066Sahrens } 1887fa9e4066Sahrens 1888fa9e4066Sahrens static void 1889fa9e4066Sahrens dbuf_destroy(dmu_buf_impl_t *db) 1890fa9e4066Sahrens { 1891fa9e4066Sahrens ASSERT(refcount_is_zero(&db->db_holds)); 1892fa9e4066Sahrens 18930a586ceaSMark Shellenbaum if (db->db_blkid != DMU_BONUS_BLKID) { 1894ea8dc4b6Seschrock /* 1895ea8dc4b6Seschrock * If this dbuf is still on the dn_dbufs list, 1896ea8dc4b6Seschrock * remove it from that list. 1897ea8dc4b6Seschrock */ 1898744947dcSTom Erickson if (db->db_dnode_handle != NULL) { 1899744947dcSTom Erickson dnode_t *dn; 19001934e92fSmaybee 1901744947dcSTom Erickson DB_DNODE_ENTER(db); 1902744947dcSTom Erickson dn = DB_DNODE(db); 19031934e92fSmaybee mutex_enter(&dn->dn_dbufs_mtx); 19040f6d88adSAlex Reece avl_remove(&dn->dn_dbufs, db); 1905640c1670SJosef 'Jeff' Sipek atomic_dec_32(&dn->dn_dbufs_count); 1906ea8dc4b6Seschrock mutex_exit(&dn->dn_dbufs_mtx); 1907744947dcSTom Erickson DB_DNODE_EXIT(db); 1908744947dcSTom Erickson /* 1909744947dcSTom Erickson * Decrementing the dbuf count means that the hold 1910744947dcSTom Erickson * corresponding to the removed dbuf is no longer 1911744947dcSTom Erickson * discounted in dnode_move(), so the dnode cannot be 1912744947dcSTom Erickson * moved until after we release the hold. 1913744947dcSTom Erickson */ 1914ea8dc4b6Seschrock dnode_rele(dn, db); 1915744947dcSTom Erickson db->db_dnode_handle = NULL; 1916ea8dc4b6Seschrock } 1917ea8dc4b6Seschrock dbuf_hash_remove(db); 1918ea8dc4b6Seschrock } 1919ea8dc4b6Seschrock db->db_parent = NULL; 1920ea8dc4b6Seschrock db->db_buf = NULL; 1921ea8dc4b6Seschrock 1922fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 1923fa9e4066Sahrens ASSERT(db->db_hash_next == NULL); 1924fa9e4066Sahrens ASSERT(db->db_blkptr == NULL); 1925fa9e4066Sahrens ASSERT(db->db_data_pending == NULL); 1926fa9e4066Sahrens 1927fa9e4066Sahrens kmem_cache_free(dbuf_cache, db); 19285a98e54bSBrendan Gregg - Sun Microsystems arc_space_return(sizeof (dmu_buf_impl_t), ARC_SPACE_OTHER); 1929fa9e4066Sahrens } 1930fa9e4066Sahrens 1931fa9e4066Sahrens void 193269962b56SMatthew Ahrens dbuf_prefetch(dnode_t *dn, uint64_t blkid, zio_priority_t prio) 1933fa9e4066Sahrens { 193413506d1eSmaybee dmu_buf_impl_t *db = NULL; 1935fa9e4066Sahrens blkptr_t *bp = NULL; 1936fa9e4066Sahrens 19370a586ceaSMark Shellenbaum ASSERT(blkid != DMU_BONUS_BLKID); 1938fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 1939fa9e4066Sahrens 1940fa9e4066Sahrens if (dnode_block_freed(dn, blkid)) 1941fa9e4066Sahrens return; 1942fa9e4066Sahrens 1943fa9e4066Sahrens /* dbuf_find() returns with db_mtx held */ 1944*e57a022bSJustin T. Gibbs if (db = dbuf_find(dn->dn_objset, dn->dn_object, 0, blkid)) { 1945fa9e4066Sahrens /* 19469e9c486fSGeorge Wilson * This dbuf is already in the cache. We assume that 19479e9c486fSGeorge Wilson * it is already CACHED, or else about to be either 1948fa9e4066Sahrens * read or filled. 1949fa9e4066Sahrens */ 1950fa9e4066Sahrens mutex_exit(&db->db_mtx); 1951fa9e4066Sahrens return; 1952fa9e4066Sahrens } 1953fa9e4066Sahrens 195413506d1eSmaybee if (dbuf_findbp(dn, 0, blkid, TRUE, &db, &bp) == 0) { 19555d7b4d43SMatthew Ahrens if (bp && !BP_IS_HOLE(bp) && !BP_IS_EMBEDDED(bp)) { 1956b24ab676SJeff Bonwick dsl_dataset_t *ds = dn->dn_objset->os_dsl_dataset; 19577adb730bSGeorge Wilson arc_flags_t aflags = 19587adb730bSGeorge Wilson ARC_FLAG_NOWAIT | ARC_FLAG_PREFETCH; 19597802d7bfSMatthew Ahrens zbookmark_phys_t zb; 1960b24ab676SJeff Bonwick 1961b24ab676SJeff Bonwick SET_BOOKMARK(&zb, ds ? ds->ds_object : DMU_META_OBJSET, 1962b24ab676SJeff Bonwick dn->dn_object, 0, blkid); 1963ea8dc4b6Seschrock 19641b912ec7SGeorge Wilson (void) arc_read(NULL, dn->dn_objset->os_spa, 196569962b56SMatthew Ahrens bp, NULL, NULL, prio, 1966fa9e4066Sahrens ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE, 196713506d1eSmaybee &aflags, &zb); 1968fa9e4066Sahrens } 196913506d1eSmaybee if (db) 197013506d1eSmaybee dbuf_rele(db, NULL); 1971fa9e4066Sahrens } 1972fa9e4066Sahrens } 1973fa9e4066Sahrens 1974fa9e4066Sahrens /* 1975fa9e4066Sahrens * Returns with db_holds incremented, and db_mtx not held. 1976fa9e4066Sahrens * Note: dn_struct_rwlock must be held. 1977fa9e4066Sahrens */ 1978fa9e4066Sahrens int 1979fa9e4066Sahrens dbuf_hold_impl(dnode_t *dn, uint8_t level, uint64_t blkid, int fail_sparse, 1980fa9e4066Sahrens void *tag, dmu_buf_impl_t **dbp) 1981fa9e4066Sahrens { 1982fa9e4066Sahrens dmu_buf_impl_t *db, *parent = NULL; 1983fa9e4066Sahrens 19840a586ceaSMark Shellenbaum ASSERT(blkid != DMU_BONUS_BLKID); 1985fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 1986fa9e4066Sahrens ASSERT3U(dn->dn_nlevels, >, level); 1987fa9e4066Sahrens 1988fa9e4066Sahrens *dbp = NULL; 1989ea8dc4b6Seschrock top: 1990fa9e4066Sahrens /* dbuf_find() returns with db_mtx held */ 1991*e57a022bSJustin T. Gibbs db = dbuf_find(dn->dn_objset, dn->dn_object, level, blkid); 1992fa9e4066Sahrens 1993fa9e4066Sahrens if (db == NULL) { 1994fa9e4066Sahrens blkptr_t *bp = NULL; 1995fa9e4066Sahrens int err; 1996fa9e4066Sahrens 1997c543ec06Sahrens ASSERT3P(parent, ==, NULL); 1998fa9e4066Sahrens err = dbuf_findbp(dn, level, blkid, fail_sparse, &parent, &bp); 1999fa9e4066Sahrens if (fail_sparse) { 2000fa9e4066Sahrens if (err == 0 && bp && BP_IS_HOLE(bp)) 2001be6fd75aSMatthew Ahrens err = SET_ERROR(ENOENT); 2002fa9e4066Sahrens if (err) { 2003c543ec06Sahrens if (parent) 2004ea8dc4b6Seschrock dbuf_rele(parent, NULL); 2005fa9e4066Sahrens return (err); 2006fa9e4066Sahrens } 2007fa9e4066Sahrens } 2008ea8dc4b6Seschrock if (err && err != ENOENT) 2009ea8dc4b6Seschrock return (err); 2010fa9e4066Sahrens db = dbuf_create(dn, level, blkid, parent, bp); 2011fa9e4066Sahrens } 2012fa9e4066Sahrens 2013ea8dc4b6Seschrock if (db->db_buf && refcount_is_zero(&db->db_holds)) { 2014ea8dc4b6Seschrock arc_buf_add_ref(db->db_buf, db); 2015ea8dc4b6Seschrock if (db->db_buf->b_data == NULL) { 2016ea8dc4b6Seschrock dbuf_clear(db); 2017c543ec06Sahrens if (parent) { 2018c543ec06Sahrens dbuf_rele(parent, NULL); 2019c543ec06Sahrens parent = NULL; 2020c543ec06Sahrens } 2021ea8dc4b6Seschrock goto top; 2022ea8dc4b6Seschrock } 2023ea8dc4b6Seschrock ASSERT3P(db->db.db_data, ==, db->db_buf->b_data); 2024ea8dc4b6Seschrock } 2025ea8dc4b6Seschrock 2026ea8dc4b6Seschrock ASSERT(db->db_buf == NULL || arc_referenced(db->db_buf)); 2027ea8dc4b6Seschrock 2028fa9e4066Sahrens /* 2029c717a561Smaybee * If this buffer is currently syncing out, and we are are 2030c717a561Smaybee * still referencing it from db_data, we need to make a copy 2031c717a561Smaybee * of it in case we decide we want to dirty it again in this txg. 2032fa9e4066Sahrens */ 20330a586ceaSMark Shellenbaum if (db->db_level == 0 && db->db_blkid != DMU_BONUS_BLKID && 2034ea8dc4b6Seschrock dn->dn_object != DMU_META_DNODE_OBJECT && 2035c717a561Smaybee db->db_state == DB_CACHED && db->db_data_pending) { 2036c717a561Smaybee dbuf_dirty_record_t *dr = db->db_data_pending; 2037c717a561Smaybee 2038c717a561Smaybee if (dr->dt.dl.dr_data == db->db_buf) { 2039ad23a2dbSjohansen arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 2040fa9e4066Sahrens 2041c717a561Smaybee dbuf_set_data(db, 2042744947dcSTom Erickson arc_buf_alloc(dn->dn_objset->os_spa, 2043c717a561Smaybee db->db.db_size, db, type)); 2044c717a561Smaybee bcopy(dr->dt.dl.dr_data->b_data, db->db.db_data, 2045fa9e4066Sahrens db->db.db_size); 2046fa9e4066Sahrens } 2047c717a561Smaybee } 2048fa9e4066Sahrens 2049ea8dc4b6Seschrock (void) refcount_add(&db->db_holds, tag); 20509c9dc39aSek110237 DBUF_VERIFY(db); 2051fa9e4066Sahrens mutex_exit(&db->db_mtx); 2052fa9e4066Sahrens 2053fa9e4066Sahrens /* NOTE: we can't rele the parent until after we drop the db_mtx */ 2054c543ec06Sahrens if (parent) 2055ea8dc4b6Seschrock dbuf_rele(parent, NULL); 2056fa9e4066Sahrens 2057744947dcSTom Erickson ASSERT3P(DB_DNODE(db), ==, dn); 2058fa9e4066Sahrens ASSERT3U(db->db_blkid, ==, blkid); 2059fa9e4066Sahrens ASSERT3U(db->db_level, ==, level); 2060fa9e4066Sahrens *dbp = db; 2061fa9e4066Sahrens 2062fa9e4066Sahrens return (0); 2063fa9e4066Sahrens } 2064fa9e4066Sahrens 2065fa9e4066Sahrens dmu_buf_impl_t * 2066ea8dc4b6Seschrock dbuf_hold(dnode_t *dn, uint64_t blkid, void *tag) 2067fa9e4066Sahrens { 2068fa9e4066Sahrens dmu_buf_impl_t *db; 2069ea8dc4b6Seschrock int err = dbuf_hold_impl(dn, 0, blkid, FALSE, tag, &db); 2070ea8dc4b6Seschrock return (err ? NULL : db); 2071fa9e4066Sahrens } 2072fa9e4066Sahrens 2073fa9e4066Sahrens dmu_buf_impl_t * 2074fa9e4066Sahrens dbuf_hold_level(dnode_t *dn, int level, uint64_t blkid, void *tag) 2075fa9e4066Sahrens { 2076fa9e4066Sahrens dmu_buf_impl_t *db; 2077ea8dc4b6Seschrock int err = dbuf_hold_impl(dn, level, blkid, FALSE, tag, &db); 2078ea8dc4b6Seschrock return (err ? NULL : db); 2079fa9e4066Sahrens } 2080fa9e4066Sahrens 20811934e92fSmaybee void 2082ea8dc4b6Seschrock dbuf_create_bonus(dnode_t *dn) 2083fa9e4066Sahrens { 2084ea8dc4b6Seschrock ASSERT(RW_WRITE_HELD(&dn->dn_struct_rwlock)); 2085ea8dc4b6Seschrock 2086ea8dc4b6Seschrock ASSERT(dn->dn_bonus == NULL); 20870a586ceaSMark Shellenbaum dn->dn_bonus = dbuf_create(dn, 0, DMU_BONUS_BLKID, dn->dn_dbuf, NULL); 20880a586ceaSMark Shellenbaum } 20890a586ceaSMark Shellenbaum 20900a586ceaSMark Shellenbaum int 20910a586ceaSMark Shellenbaum dbuf_spill_set_blksz(dmu_buf_t *db_fake, uint64_t blksz, dmu_tx_t *tx) 20920a586ceaSMark Shellenbaum { 20930a586ceaSMark Shellenbaum dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 2094744947dcSTom Erickson dnode_t *dn; 2095744947dcSTom Erickson 20960a586ceaSMark Shellenbaum if (db->db_blkid != DMU_SPILL_BLKID) 2097be6fd75aSMatthew Ahrens return (SET_ERROR(ENOTSUP)); 20980a586ceaSMark Shellenbaum if (blksz == 0) 20990a586ceaSMark Shellenbaum blksz = SPA_MINBLOCKSIZE; 2100b5152584SMatthew Ahrens ASSERT3U(blksz, <=, spa_maxblocksize(dmu_objset_spa(db->db_objset))); 21010a586ceaSMark Shellenbaum blksz = P2ROUNDUP(blksz, SPA_MINBLOCKSIZE); 21020a586ceaSMark Shellenbaum 2103744947dcSTom Erickson DB_DNODE_ENTER(db); 2104744947dcSTom Erickson dn = DB_DNODE(db); 2105744947dcSTom Erickson rw_enter(&dn->dn_struct_rwlock, RW_WRITER); 21060a586ceaSMark Shellenbaum dbuf_new_size(db, blksz, tx); 2107744947dcSTom Erickson rw_exit(&dn->dn_struct_rwlock); 2108744947dcSTom Erickson DB_DNODE_EXIT(db); 21090a586ceaSMark Shellenbaum 21100a586ceaSMark Shellenbaum return (0); 21110a586ceaSMark Shellenbaum } 21120a586ceaSMark Shellenbaum 21130a586ceaSMark Shellenbaum void 21140a586ceaSMark Shellenbaum dbuf_rm_spill(dnode_t *dn, dmu_tx_t *tx) 21150a586ceaSMark Shellenbaum { 21160a586ceaSMark Shellenbaum dbuf_free_range(dn, DMU_SPILL_BLKID, DMU_SPILL_BLKID, tx); 2117fa9e4066Sahrens } 2118fa9e4066Sahrens 2119ea8dc4b6Seschrock #pragma weak dmu_buf_add_ref = dbuf_add_ref 2120fa9e4066Sahrens void 2121fa9e4066Sahrens dbuf_add_ref(dmu_buf_impl_t *db, void *tag) 2122fa9e4066Sahrens { 2123ea8dc4b6Seschrock int64_t holds = refcount_add(&db->db_holds, tag); 2124ea8dc4b6Seschrock ASSERT(holds > 1); 2125fa9e4066Sahrens } 2126fa9e4066Sahrens 2127*e57a022bSJustin T. Gibbs #pragma weak dmu_buf_try_add_ref = dbuf_try_add_ref 2128*e57a022bSJustin T. Gibbs boolean_t 2129*e57a022bSJustin T. Gibbs dbuf_try_add_ref(dmu_buf_t *db_fake, objset_t *os, uint64_t obj, uint64_t blkid, 2130*e57a022bSJustin T. Gibbs void *tag) 2131*e57a022bSJustin T. Gibbs { 2132*e57a022bSJustin T. Gibbs dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 2133*e57a022bSJustin T. Gibbs dmu_buf_impl_t *found_db; 2134*e57a022bSJustin T. Gibbs boolean_t result = B_FALSE; 2135*e57a022bSJustin T. Gibbs 2136*e57a022bSJustin T. Gibbs if (db->db_blkid == DMU_BONUS_BLKID) 2137*e57a022bSJustin T. Gibbs found_db = dbuf_find_bonus(os, obj); 2138*e57a022bSJustin T. Gibbs else 2139*e57a022bSJustin T. Gibbs found_db = dbuf_find(os, obj, 0, blkid); 2140*e57a022bSJustin T. Gibbs 2141*e57a022bSJustin T. Gibbs if (found_db != NULL) { 2142*e57a022bSJustin T. Gibbs if (db == found_db && dbuf_refcount(db) > db->db_dirtycnt) { 2143*e57a022bSJustin T. Gibbs (void) refcount_add(&db->db_holds, tag); 2144*e57a022bSJustin T. Gibbs result = B_TRUE; 2145*e57a022bSJustin T. Gibbs } 2146*e57a022bSJustin T. Gibbs mutex_exit(&db->db_mtx); 2147*e57a022bSJustin T. Gibbs } 2148*e57a022bSJustin T. Gibbs return (result); 2149*e57a022bSJustin T. Gibbs } 2150*e57a022bSJustin T. Gibbs 2151744947dcSTom Erickson /* 2152744947dcSTom Erickson * If you call dbuf_rele() you had better not be referencing the dnode handle 2153744947dcSTom Erickson * unless you have some other direct or indirect hold on the dnode. (An indirect 2154744947dcSTom Erickson * hold is a hold on one of the dnode's dbufs, including the bonus buffer.) 2155744947dcSTom Erickson * Without that, the dbuf_rele() could lead to a dnode_rele() followed by the 2156744947dcSTom Erickson * dnode's parent dbuf evicting its dnode handles. 2157744947dcSTom Erickson */ 2158fa9e4066Sahrens void 2159ea8dc4b6Seschrock dbuf_rele(dmu_buf_impl_t *db, void *tag) 2160fa9e4066Sahrens { 2161b24ab676SJeff Bonwick mutex_enter(&db->db_mtx); 2162b24ab676SJeff Bonwick dbuf_rele_and_unlock(db, tag); 2163b24ab676SJeff Bonwick } 2164b24ab676SJeff Bonwick 216543466aaeSMax Grossman void 216643466aaeSMax Grossman dmu_buf_rele(dmu_buf_t *db, void *tag) 216743466aaeSMax Grossman { 216843466aaeSMax Grossman dbuf_rele((dmu_buf_impl_t *)db, tag); 216943466aaeSMax Grossman } 217043466aaeSMax Grossman 2171b24ab676SJeff Bonwick /* 2172b24ab676SJeff Bonwick * dbuf_rele() for an already-locked dbuf. This is necessary to allow 2173b24ab676SJeff Bonwick * db_dirtycnt and db_holds to be updated atomically. 2174b24ab676SJeff Bonwick */ 2175b24ab676SJeff Bonwick void 2176b24ab676SJeff Bonwick dbuf_rele_and_unlock(dmu_buf_impl_t *db, void *tag) 2177b24ab676SJeff Bonwick { 2178fa9e4066Sahrens int64_t holds; 2179fa9e4066Sahrens 2180b24ab676SJeff Bonwick ASSERT(MUTEX_HELD(&db->db_mtx)); 21819c9dc39aSek110237 DBUF_VERIFY(db); 2182fa9e4066Sahrens 2183744947dcSTom Erickson /* 2184744947dcSTom Erickson * Remove the reference to the dbuf before removing its hold on the 2185744947dcSTom Erickson * dnode so we can guarantee in dnode_move() that a referenced bonus 2186744947dcSTom Erickson * buffer has a corresponding dnode hold. 2187744947dcSTom Erickson */ 2188fa9e4066Sahrens holds = refcount_remove(&db->db_holds, tag); 2189ea8dc4b6Seschrock ASSERT(holds >= 0); 2190fa9e4066Sahrens 2191c717a561Smaybee /* 2192c717a561Smaybee * We can't freeze indirects if there is a possibility that they 2193c717a561Smaybee * may be modified in the current syncing context. 2194c717a561Smaybee */ 2195c717a561Smaybee if (db->db_buf && holds == (db->db_level == 0 ? db->db_dirtycnt : 0)) 21966b4acc8bSahrens arc_buf_freeze(db->db_buf); 21976b4acc8bSahrens 2198fa9e4066Sahrens if (holds == db->db_dirtycnt && 2199c717a561Smaybee db->db_level == 0 && db->db_immediate_evict) 2200fa9e4066Sahrens dbuf_evict_user(db); 2201ea8dc4b6Seschrock 2202ea8dc4b6Seschrock if (holds == 0) { 22030a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 2204ea8dc4b6Seschrock mutex_exit(&db->db_mtx); 2205744947dcSTom Erickson 2206744947dcSTom Erickson /* 2207744947dcSTom Erickson * If the dnode moves here, we cannot cross this barrier 2208744947dcSTom Erickson * until the move completes. 2209744947dcSTom Erickson */ 2210744947dcSTom Erickson DB_DNODE_ENTER(db); 2211640c1670SJosef 'Jeff' Sipek atomic_dec_32(&DB_DNODE(db)->dn_dbufs_count); 2212744947dcSTom Erickson DB_DNODE_EXIT(db); 2213744947dcSTom Erickson /* 2214744947dcSTom Erickson * The bonus buffer's dnode hold is no longer discounted 2215744947dcSTom Erickson * in dnode_move(). The dnode cannot move until after 2216744947dcSTom Erickson * the dnode_rele(). 2217744947dcSTom Erickson */ 2218744947dcSTom Erickson dnode_rele(DB_DNODE(db), db); 2219ea8dc4b6Seschrock } else if (db->db_buf == NULL) { 2220ea8dc4b6Seschrock /* 2221ea8dc4b6Seschrock * This is a special case: we never associated this 2222ea8dc4b6Seschrock * dbuf with any data allocated from the ARC. 2223ea8dc4b6Seschrock */ 222482c9918fSTim Haley ASSERT(db->db_state == DB_UNCACHED || 222582c9918fSTim Haley db->db_state == DB_NOFILL); 2226ea8dc4b6Seschrock dbuf_evict(db); 2227ea8dc4b6Seschrock } else if (arc_released(db->db_buf)) { 2228ea8dc4b6Seschrock arc_buf_t *buf = db->db_buf; 2229ea8dc4b6Seschrock /* 2230ea8dc4b6Seschrock * This dbuf has anonymous data associated with it. 2231ea8dc4b6Seschrock */ 2232bc9014e6SJustin Gibbs dbuf_clear_data(db); 22333b2aab18SMatthew Ahrens VERIFY(arc_buf_remove_ref(buf, db)); 2234ea8dc4b6Seschrock dbuf_evict(db); 2235ea8dc4b6Seschrock } else { 22363b2aab18SMatthew Ahrens VERIFY(!arc_buf_remove_ref(db->db_buf, db)); 22379253d63dSGeorge Wilson 22389253d63dSGeorge Wilson /* 22399253d63dSGeorge Wilson * A dbuf will be eligible for eviction if either the 22409253d63dSGeorge Wilson * 'primarycache' property is set or a duplicate 22419253d63dSGeorge Wilson * copy of this buffer is already cached in the arc. 22429253d63dSGeorge Wilson * 22439253d63dSGeorge Wilson * In the case of the 'primarycache' a buffer 22449253d63dSGeorge Wilson * is considered for eviction if it matches the 22459253d63dSGeorge Wilson * criteria set in the property. 22469253d63dSGeorge Wilson * 22479253d63dSGeorge Wilson * To decide if our buffer is considered a 22489253d63dSGeorge Wilson * duplicate, we must call into the arc to determine 22499253d63dSGeorge Wilson * if multiple buffers are referencing the same 22509253d63dSGeorge Wilson * block on-disk. If so, then we simply evict 22519253d63dSGeorge Wilson * ourselves. 22529253d63dSGeorge Wilson */ 2253bbfa8ea8SMatthew Ahrens if (!DBUF_IS_CACHEABLE(db)) { 2254bbfa8ea8SMatthew Ahrens if (db->db_blkptr != NULL && 2255bbfa8ea8SMatthew Ahrens !BP_IS_HOLE(db->db_blkptr) && 2256bbfa8ea8SMatthew Ahrens !BP_IS_EMBEDDED(db->db_blkptr)) { 2257bbfa8ea8SMatthew Ahrens spa_t *spa = 2258bbfa8ea8SMatthew Ahrens dmu_objset_spa(db->db_objset); 2259bbfa8ea8SMatthew Ahrens blkptr_t bp = *db->db_blkptr; 22603baa08fcSek110237 dbuf_clear(db); 2261bbfa8ea8SMatthew Ahrens arc_freed(spa, &bp); 2262bbfa8ea8SMatthew Ahrens } else { 2263bbfa8ea8SMatthew Ahrens dbuf_clear(db); 2264bbfa8ea8SMatthew Ahrens } 2265bc9014e6SJustin Gibbs } else if (db->db_objset->os_evicting || 2266bc9014e6SJustin Gibbs arc_buf_eviction_needed(db->db_buf)) { 2267bbfa8ea8SMatthew Ahrens dbuf_clear(db); 2268bbfa8ea8SMatthew Ahrens } else { 2269fa9e4066Sahrens mutex_exit(&db->db_mtx); 2270fa9e4066Sahrens } 2271bbfa8ea8SMatthew Ahrens } 2272ea8dc4b6Seschrock } else { 2273ea8dc4b6Seschrock mutex_exit(&db->db_mtx); 2274fa9e4066Sahrens } 2275fa9e4066Sahrens } 2276fa9e4066Sahrens 2277fa9e4066Sahrens #pragma weak dmu_buf_refcount = dbuf_refcount 2278fa9e4066Sahrens uint64_t 2279fa9e4066Sahrens dbuf_refcount(dmu_buf_impl_t *db) 2280fa9e4066Sahrens { 2281fa9e4066Sahrens return (refcount_count(&db->db_holds)); 2282fa9e4066Sahrens } 2283fa9e4066Sahrens 2284fa9e4066Sahrens void * 2285bc9014e6SJustin Gibbs dmu_buf_replace_user(dmu_buf_t *db_fake, dmu_buf_user_t *old_user, 2286bc9014e6SJustin Gibbs dmu_buf_user_t *new_user) 2287fa9e4066Sahrens { 2288bc9014e6SJustin Gibbs dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 2289bc9014e6SJustin Gibbs 2290bc9014e6SJustin Gibbs mutex_enter(&db->db_mtx); 2291bc9014e6SJustin Gibbs dbuf_verify_user(db, DBVU_NOT_EVICTING); 2292bc9014e6SJustin Gibbs if (db->db_user == old_user) 2293bc9014e6SJustin Gibbs db->db_user = new_user; 2294bc9014e6SJustin Gibbs else 2295bc9014e6SJustin Gibbs old_user = db->db_user; 2296bc9014e6SJustin Gibbs dbuf_verify_user(db, DBVU_NOT_EVICTING); 2297bc9014e6SJustin Gibbs mutex_exit(&db->db_mtx); 2298bc9014e6SJustin Gibbs 2299bc9014e6SJustin Gibbs return (old_user); 2300fa9e4066Sahrens } 2301fa9e4066Sahrens 2302fa9e4066Sahrens void * 2303bc9014e6SJustin Gibbs dmu_buf_set_user(dmu_buf_t *db_fake, dmu_buf_user_t *user) 2304bc9014e6SJustin Gibbs { 2305bc9014e6SJustin Gibbs return (dmu_buf_replace_user(db_fake, NULL, user)); 2306bc9014e6SJustin Gibbs } 2307bc9014e6SJustin Gibbs 2308bc9014e6SJustin Gibbs void * 2309bc9014e6SJustin Gibbs dmu_buf_set_user_ie(dmu_buf_t *db_fake, dmu_buf_user_t *user) 2310fa9e4066Sahrens { 2311fa9e4066Sahrens dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 2312fa9e4066Sahrens 2313c717a561Smaybee db->db_immediate_evict = TRUE; 2314bc9014e6SJustin Gibbs return (dmu_buf_set_user(db_fake, user)); 2315fa9e4066Sahrens } 2316fa9e4066Sahrens 2317fa9e4066Sahrens void * 2318bc9014e6SJustin Gibbs dmu_buf_remove_user(dmu_buf_t *db_fake, dmu_buf_user_t *user) 2319fa9e4066Sahrens { 2320bc9014e6SJustin Gibbs return (dmu_buf_replace_user(db_fake, user, NULL)); 2321fa9e4066Sahrens } 2322fa9e4066Sahrens 2323fa9e4066Sahrens void * 2324fa9e4066Sahrens dmu_buf_get_user(dmu_buf_t *db_fake) 2325fa9e4066Sahrens { 2326fa9e4066Sahrens dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 2327fa9e4066Sahrens 2328bc9014e6SJustin Gibbs dbuf_verify_user(db, DBVU_NOT_EVICTING); 2329bc9014e6SJustin Gibbs return (db->db_user); 2330bc9014e6SJustin Gibbs } 2331bc9014e6SJustin Gibbs 2332bc9014e6SJustin Gibbs void 2333bc9014e6SJustin Gibbs dmu_buf_user_evict_wait() 2334bc9014e6SJustin Gibbs { 2335bc9014e6SJustin Gibbs taskq_wait(dbu_evict_taskq); 2336fa9e4066Sahrens } 2337fa9e4066Sahrens 23383d692628SSanjeev Bagewadi boolean_t 23393d692628SSanjeev Bagewadi dmu_buf_freeable(dmu_buf_t *dbuf) 23403d692628SSanjeev Bagewadi { 23413d692628SSanjeev Bagewadi boolean_t res = B_FALSE; 23423d692628SSanjeev Bagewadi dmu_buf_impl_t *db = (dmu_buf_impl_t *)dbuf; 23433d692628SSanjeev Bagewadi 23443d692628SSanjeev Bagewadi if (db->db_blkptr) 23453d692628SSanjeev Bagewadi res = dsl_dataset_block_freeable(db->db_objset->os_dsl_dataset, 2346c7cd2421SGeorge Wilson db->db_blkptr, db->db_blkptr->blk_birth); 23473d692628SSanjeev Bagewadi 23483d692628SSanjeev Bagewadi return (res); 23493d692628SSanjeev Bagewadi } 23503d692628SSanjeev Bagewadi 235180901aeaSGeorge Wilson blkptr_t * 235280901aeaSGeorge Wilson dmu_buf_get_blkptr(dmu_buf_t *db) 235380901aeaSGeorge Wilson { 235480901aeaSGeorge Wilson dmu_buf_impl_t *dbi = (dmu_buf_impl_t *)db; 235580901aeaSGeorge Wilson return (dbi->db_blkptr); 235680901aeaSGeorge Wilson } 235780901aeaSGeorge Wilson 2358c717a561Smaybee static void 2359c717a561Smaybee dbuf_check_blkptr(dnode_t *dn, dmu_buf_impl_t *db) 2360fa9e4066Sahrens { 2361c717a561Smaybee /* ASSERT(dmu_tx_is_syncing(tx) */ 2362c717a561Smaybee ASSERT(MUTEX_HELD(&db->db_mtx)); 2363c717a561Smaybee 2364c717a561Smaybee if (db->db_blkptr != NULL) 2365c717a561Smaybee return; 2366c717a561Smaybee 23670a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) { 23680a586ceaSMark Shellenbaum db->db_blkptr = &dn->dn_phys->dn_spill; 23690a586ceaSMark Shellenbaum BP_ZERO(db->db_blkptr); 23700a586ceaSMark Shellenbaum return; 23710a586ceaSMark Shellenbaum } 2372c717a561Smaybee if (db->db_level == dn->dn_phys->dn_nlevels-1) { 2373c717a561Smaybee /* 2374c717a561Smaybee * This buffer was allocated at a time when there was 2375c717a561Smaybee * no available blkptrs from the dnode, or it was 2376c717a561Smaybee * inappropriate to hook it in (i.e., nlevels mis-match). 2377c717a561Smaybee */ 2378c717a561Smaybee ASSERT(db->db_blkid < dn->dn_phys->dn_nblkptr); 2379c717a561Smaybee ASSERT(db->db_parent == NULL); 2380c717a561Smaybee db->db_parent = dn->dn_dbuf; 2381c717a561Smaybee db->db_blkptr = &dn->dn_phys->dn_blkptr[db->db_blkid]; 2382c717a561Smaybee DBUF_VERIFY(db); 2383c717a561Smaybee } else { 2384c717a561Smaybee dmu_buf_impl_t *parent = db->db_parent; 2385c717a561Smaybee int epbs = dn->dn_phys->dn_indblkshift - SPA_BLKPTRSHIFT; 2386c717a561Smaybee 2387c717a561Smaybee ASSERT(dn->dn_phys->dn_nlevels > 1); 2388c717a561Smaybee if (parent == NULL) { 2389c717a561Smaybee mutex_exit(&db->db_mtx); 2390c717a561Smaybee rw_enter(&dn->dn_struct_rwlock, RW_READER); 2391c717a561Smaybee (void) dbuf_hold_impl(dn, db->db_level+1, 2392c717a561Smaybee db->db_blkid >> epbs, FALSE, db, &parent); 2393c717a561Smaybee rw_exit(&dn->dn_struct_rwlock); 2394c717a561Smaybee mutex_enter(&db->db_mtx); 2395c717a561Smaybee db->db_parent = parent; 2396c717a561Smaybee } 2397c717a561Smaybee db->db_blkptr = (blkptr_t *)parent->db.db_data + 2398c717a561Smaybee (db->db_blkid & ((1ULL << epbs) - 1)); 2399c717a561Smaybee DBUF_VERIFY(db); 2400c717a561Smaybee } 2401c717a561Smaybee } 2402c717a561Smaybee 2403c717a561Smaybee static void 2404c717a561Smaybee dbuf_sync_indirect(dbuf_dirty_record_t *dr, dmu_tx_t *tx) 2405c717a561Smaybee { 2406c717a561Smaybee dmu_buf_impl_t *db = dr->dr_dbuf; 2407744947dcSTom Erickson dnode_t *dn; 2408c717a561Smaybee zio_t *zio; 2409c717a561Smaybee 2410c717a561Smaybee ASSERT(dmu_tx_is_syncing(tx)); 2411c717a561Smaybee 2412c717a561Smaybee dprintf_dbuf_bp(db, db->db_blkptr, "blkptr=%p", db->db_blkptr); 2413c717a561Smaybee 2414c717a561Smaybee mutex_enter(&db->db_mtx); 2415c717a561Smaybee 2416c717a561Smaybee ASSERT(db->db_level > 0); 2417c717a561Smaybee DBUF_VERIFY(db); 2418c717a561Smaybee 24193e30c24aSWill Andrews /* Read the block if it hasn't been read yet. */ 2420c717a561Smaybee if (db->db_buf == NULL) { 2421c717a561Smaybee mutex_exit(&db->db_mtx); 2422c717a561Smaybee (void) dbuf_read(db, NULL, DB_RF_MUST_SUCCEED); 2423c717a561Smaybee mutex_enter(&db->db_mtx); 2424c717a561Smaybee } 2425c717a561Smaybee ASSERT3U(db->db_state, ==, DB_CACHED); 2426c717a561Smaybee ASSERT(db->db_buf != NULL); 2427c717a561Smaybee 2428744947dcSTom Erickson DB_DNODE_ENTER(db); 2429744947dcSTom Erickson dn = DB_DNODE(db); 24303e30c24aSWill Andrews /* Indirect block size must match what the dnode thinks it is. */ 2431744947dcSTom Erickson ASSERT3U(db->db.db_size, ==, 1<<dn->dn_phys->dn_indblkshift); 2432c717a561Smaybee dbuf_check_blkptr(dn, db); 2433744947dcSTom Erickson DB_DNODE_EXIT(db); 2434c717a561Smaybee 24353e30c24aSWill Andrews /* Provide the pending dirty record to child dbufs */ 2436c717a561Smaybee db->db_data_pending = dr; 2437c717a561Smaybee 2438af2c4821Smaybee mutex_exit(&db->db_mtx); 2439088f3894Sahrens dbuf_write(dr, db->db_buf, tx); 2440c717a561Smaybee 2441c717a561Smaybee zio = dr->dr_zio; 2442c717a561Smaybee mutex_enter(&dr->dt.di.dr_mtx); 2443c717a561Smaybee dbuf_sync_list(&dr->dt.di.dr_children, tx); 2444c717a561Smaybee ASSERT(list_head(&dr->dt.di.dr_children) == NULL); 2445c717a561Smaybee mutex_exit(&dr->dt.di.dr_mtx); 2446c717a561Smaybee zio_nowait(zio); 2447c717a561Smaybee } 2448c717a561Smaybee 2449c717a561Smaybee static void 2450c717a561Smaybee dbuf_sync_leaf(dbuf_dirty_record_t *dr, dmu_tx_t *tx) 2451c717a561Smaybee { 2452c717a561Smaybee arc_buf_t **datap = &dr->dt.dl.dr_data; 2453c717a561Smaybee dmu_buf_impl_t *db = dr->dr_dbuf; 2454744947dcSTom Erickson dnode_t *dn; 2455744947dcSTom Erickson objset_t *os; 2456c717a561Smaybee uint64_t txg = tx->tx_txg; 2457fa9e4066Sahrens 2458fa9e4066Sahrens ASSERT(dmu_tx_is_syncing(tx)); 2459fa9e4066Sahrens 2460fa9e4066Sahrens dprintf_dbuf_bp(db, db->db_blkptr, "blkptr=%p", db->db_blkptr); 2461fa9e4066Sahrens 2462fa9e4066Sahrens mutex_enter(&db->db_mtx); 2463fa9e4066Sahrens /* 2464fa9e4066Sahrens * To be synced, we must be dirtied. But we 2465fa9e4066Sahrens * might have been freed after the dirty. 2466fa9e4066Sahrens */ 2467fa9e4066Sahrens if (db->db_state == DB_UNCACHED) { 2468fa9e4066Sahrens /* This buffer has been freed since it was dirtied */ 2469fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 2470fa9e4066Sahrens } else if (db->db_state == DB_FILL) { 2471fa9e4066Sahrens /* This buffer was freed and is now being re-filled */ 2472c717a561Smaybee ASSERT(db->db.db_data != dr->dt.dl.dr_data); 2473fa9e4066Sahrens } else { 247482c9918fSTim Haley ASSERT(db->db_state == DB_CACHED || db->db_state == DB_NOFILL); 2475fa9e4066Sahrens } 24769c9dc39aSek110237 DBUF_VERIFY(db); 2477fa9e4066Sahrens 2478744947dcSTom Erickson DB_DNODE_ENTER(db); 2479744947dcSTom Erickson dn = DB_DNODE(db); 2480744947dcSTom Erickson 24810a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) { 24820a586ceaSMark Shellenbaum mutex_enter(&dn->dn_mtx); 24830a586ceaSMark Shellenbaum dn->dn_phys->dn_flags |= DNODE_FLAG_SPILL_BLKPTR; 24840a586ceaSMark Shellenbaum mutex_exit(&dn->dn_mtx); 24850a586ceaSMark Shellenbaum } 24860a586ceaSMark Shellenbaum 2487fa9e4066Sahrens /* 2488c717a561Smaybee * If this is a bonus buffer, simply copy the bonus data into the 2489c717a561Smaybee * dnode. It will be written out when the dnode is synced (and it 2490c717a561Smaybee * will be synced, since it must have been dirty for dbuf_sync to 2491c717a561Smaybee * be called). 2492fa9e4066Sahrens */ 24930a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 2494c717a561Smaybee dbuf_dirty_record_t **drp; 24951934e92fSmaybee 2496ea8dc4b6Seschrock ASSERT(*datap != NULL); 2497fb09f5aaSMadhav Suresh ASSERT0(db->db_level); 2498ea8dc4b6Seschrock ASSERT3U(dn->dn_phys->dn_bonuslen, <=, DN_MAX_BONUSLEN); 2499ea8dc4b6Seschrock bcopy(*datap, DN_BONUS(dn->dn_phys), dn->dn_phys->dn_bonuslen); 2500744947dcSTom Erickson DB_DNODE_EXIT(db); 2501744947dcSTom Erickson 25020e8c6158Smaybee if (*datap != db->db.db_data) { 2503ea8dc4b6Seschrock zio_buf_free(*datap, DN_MAX_BONUSLEN); 25045a98e54bSBrendan Gregg - Sun Microsystems arc_space_return(DN_MAX_BONUSLEN, ARC_SPACE_OTHER); 25050e8c6158Smaybee } 2506ea8dc4b6Seschrock db->db_data_pending = NULL; 2507c717a561Smaybee drp = &db->db_last_dirty; 2508c717a561Smaybee while (*drp != dr) 2509c717a561Smaybee drp = &(*drp)->dr_next; 251017f17c2dSbonwick ASSERT(dr->dr_next == NULL); 2511b24ab676SJeff Bonwick ASSERT(dr->dr_dbuf == db); 251217f17c2dSbonwick *drp = dr->dr_next; 2513c717a561Smaybee kmem_free(dr, sizeof (dbuf_dirty_record_t)); 2514ea8dc4b6Seschrock ASSERT(db->db_dirtycnt > 0); 2515ea8dc4b6Seschrock db->db_dirtycnt -= 1; 2516b24ab676SJeff Bonwick dbuf_rele_and_unlock(db, (void *)(uintptr_t)txg); 2517ea8dc4b6Seschrock return; 2518ea8dc4b6Seschrock } 2519ea8dc4b6Seschrock 2520744947dcSTom Erickson os = dn->dn_objset; 2521744947dcSTom Erickson 2522c5c6ffa0Smaybee /* 2523f82bfe17Sgw25295 * This function may have dropped the db_mtx lock allowing a dmu_sync 2524f82bfe17Sgw25295 * operation to sneak in. As a result, we need to ensure that we 2525f82bfe17Sgw25295 * don't check the dr_override_state until we have returned from 2526f82bfe17Sgw25295 * dbuf_check_blkptr. 2527f82bfe17Sgw25295 */ 2528f82bfe17Sgw25295 dbuf_check_blkptr(dn, db); 2529f82bfe17Sgw25295 2530f82bfe17Sgw25295 /* 2531744947dcSTom Erickson * If this buffer is in the middle of an immediate write, 2532c717a561Smaybee * wait for the synchronous IO to complete. 2533c5c6ffa0Smaybee */ 2534c717a561Smaybee while (dr->dt.dl.dr_override_state == DR_IN_DMU_SYNC) { 2535c5c6ffa0Smaybee ASSERT(dn->dn_object != DMU_META_DNODE_OBJECT); 2536c5c6ffa0Smaybee cv_wait(&db->db_changed, &db->db_mtx); 2537c717a561Smaybee ASSERT(dr->dt.dl.dr_override_state != DR_NOT_OVERRIDDEN); 2538c5c6ffa0Smaybee } 2539c717a561Smaybee 2540ab69d62fSMatthew Ahrens if (db->db_state != DB_NOFILL && 2541ab69d62fSMatthew Ahrens dn->dn_object != DMU_META_DNODE_OBJECT && 2542ab69d62fSMatthew Ahrens refcount_count(&db->db_holds) > 1 && 2543b24ab676SJeff Bonwick dr->dt.dl.dr_override_state != DR_OVERRIDDEN && 2544ab69d62fSMatthew Ahrens *datap == db->db_buf) { 2545fa9e4066Sahrens /* 254682c9918fSTim Haley * If this buffer is currently "in use" (i.e., there 254782c9918fSTim Haley * are active holds and db_data still references it), 254882c9918fSTim Haley * then make a copy before we start the write so that 254982c9918fSTim Haley * any modifications from the open txg will not leak 255082c9918fSTim Haley * into this write. 2551fa9e4066Sahrens * 255282c9918fSTim Haley * NOTE: this copy does not need to be made for 255382c9918fSTim Haley * objects only modified in the syncing context (e.g. 255482c9918fSTim Haley * DNONE_DNODE blocks). 2555fa9e4066Sahrens */ 2556ab69d62fSMatthew Ahrens int blksz = arc_buf_size(*datap); 2557ab69d62fSMatthew Ahrens arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 2558ab69d62fSMatthew Ahrens *datap = arc_buf_alloc(os->os_spa, blksz, db, type); 2559c717a561Smaybee bcopy(db->db.db_data, (*datap)->b_data, blksz); 2560fa9e4066Sahrens } 2561c717a561Smaybee db->db_data_pending = dr; 2562fa9e4066Sahrens 2563fa9e4066Sahrens mutex_exit(&db->db_mtx); 2564fa9e4066Sahrens 2565088f3894Sahrens dbuf_write(dr, *datap, tx); 2566c717a561Smaybee 2567c717a561Smaybee ASSERT(!list_link_active(&dr->dr_dirty_node)); 2568744947dcSTom Erickson if (dn->dn_object == DMU_META_DNODE_OBJECT) { 2569c717a561Smaybee list_insert_tail(&dn->dn_dirty_records[txg&TXG_MASK], dr); 2570744947dcSTom Erickson DB_DNODE_EXIT(db); 2571744947dcSTom Erickson } else { 2572744947dcSTom Erickson /* 2573744947dcSTom Erickson * Although zio_nowait() does not "wait for an IO", it does 2574744947dcSTom Erickson * initiate the IO. If this is an empty write it seems plausible 2575744947dcSTom Erickson * that the IO could actually be completed before the nowait 2576744947dcSTom Erickson * returns. We need to DB_DNODE_EXIT() first in case 2577744947dcSTom Erickson * zio_nowait() invalidates the dbuf. 2578744947dcSTom Erickson */ 2579744947dcSTom Erickson DB_DNODE_EXIT(db); 2580c717a561Smaybee zio_nowait(dr->dr_zio); 2581fa9e4066Sahrens } 2582744947dcSTom Erickson } 2583c717a561Smaybee 2584c717a561Smaybee void 2585c717a561Smaybee dbuf_sync_list(list_t *list, dmu_tx_t *tx) 2586c717a561Smaybee { 2587c717a561Smaybee dbuf_dirty_record_t *dr; 2588c717a561Smaybee 2589c717a561Smaybee while (dr = list_head(list)) { 2590c717a561Smaybee if (dr->dr_zio != NULL) { 2591c717a561Smaybee /* 2592c717a561Smaybee * If we find an already initialized zio then we 2593c717a561Smaybee * are processing the meta-dnode, and we have finished. 2594c717a561Smaybee * The dbufs for all dnodes are put back on the list 2595c717a561Smaybee * during processing, so that we can zio_wait() 2596c717a561Smaybee * these IOs after initiating all child IOs. 2597c717a561Smaybee */ 2598c717a561Smaybee ASSERT3U(dr->dr_dbuf->db.db_object, ==, 2599c717a561Smaybee DMU_META_DNODE_OBJECT); 2600c717a561Smaybee break; 2601fa9e4066Sahrens } 2602c717a561Smaybee list_remove(list, dr); 2603c717a561Smaybee if (dr->dr_dbuf->db_level > 0) 2604c717a561Smaybee dbuf_sync_indirect(dr, tx); 2605c717a561Smaybee else 2606c717a561Smaybee dbuf_sync_leaf(dr, tx); 2607c717a561Smaybee } 2608c717a561Smaybee } 2609c717a561Smaybee 2610fa9e4066Sahrens /* ARGSUSED */ 2611fa9e4066Sahrens static void 2612c717a561Smaybee dbuf_write_ready(zio_t *zio, arc_buf_t *buf, void *vdb) 2613fa9e4066Sahrens { 2614fa9e4066Sahrens dmu_buf_impl_t *db = vdb; 2615744947dcSTom Erickson dnode_t *dn; 2616e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 2617c717a561Smaybee blkptr_t *bp_orig = &zio->io_bp_orig; 2618b24ab676SJeff Bonwick spa_t *spa = zio->io_spa; 2619b24ab676SJeff Bonwick int64_t delta; 2620fa9e4066Sahrens uint64_t fill = 0; 2621b24ab676SJeff Bonwick int i; 2622fa9e4066Sahrens 26235d7b4d43SMatthew Ahrens ASSERT3P(db->db_blkptr, ==, bp); 2624e14bb325SJeff Bonwick 2625744947dcSTom Erickson DB_DNODE_ENTER(db); 2626744947dcSTom Erickson dn = DB_DNODE(db); 2627b24ab676SJeff Bonwick delta = bp_get_dsize_sync(spa, bp) - bp_get_dsize_sync(spa, bp_orig); 2628b24ab676SJeff Bonwick dnode_diduse_space(dn, delta - zio->io_prev_space_delta); 2629b24ab676SJeff Bonwick zio->io_prev_space_delta = delta; 2630fa9e4066Sahrens 263143466aaeSMax Grossman if (bp->blk_birth != 0) { 26320a586ceaSMark Shellenbaum ASSERT((db->db_blkid != DMU_SPILL_BLKID && 26330a586ceaSMark Shellenbaum BP_GET_TYPE(bp) == dn->dn_type) || 26340a586ceaSMark Shellenbaum (db->db_blkid == DMU_SPILL_BLKID && 26355d7b4d43SMatthew Ahrens BP_GET_TYPE(bp) == dn->dn_bonustype) || 26365d7b4d43SMatthew Ahrens BP_IS_EMBEDDED(bp)); 2637e14bb325SJeff Bonwick ASSERT(BP_GET_LEVEL(bp) == db->db_level); 263843466aaeSMax Grossman } 2639e14bb325SJeff Bonwick 2640fa9e4066Sahrens mutex_enter(&db->db_mtx); 2641fa9e4066Sahrens 26420a586ceaSMark Shellenbaum #ifdef ZFS_DEBUG 26430a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) { 26440a586ceaSMark Shellenbaum ASSERT(dn->dn_phys->dn_flags & DNODE_FLAG_SPILL_BLKPTR); 26450a586ceaSMark Shellenbaum ASSERT(!(BP_IS_HOLE(db->db_blkptr)) && 26460a586ceaSMark Shellenbaum db->db_blkptr == &dn->dn_phys->dn_spill); 26470a586ceaSMark Shellenbaum } 26480a586ceaSMark Shellenbaum #endif 26490a586ceaSMark Shellenbaum 2650fa9e4066Sahrens if (db->db_level == 0) { 2651fa9e4066Sahrens mutex_enter(&dn->dn_mtx); 26520a586ceaSMark Shellenbaum if (db->db_blkid > dn->dn_phys->dn_maxblkid && 26530a586ceaSMark Shellenbaum db->db_blkid != DMU_SPILL_BLKID) 2654fa9e4066Sahrens dn->dn_phys->dn_maxblkid = db->db_blkid; 2655fa9e4066Sahrens mutex_exit(&dn->dn_mtx); 2656fa9e4066Sahrens 2657fa9e4066Sahrens if (dn->dn_type == DMU_OT_DNODE) { 2658fa9e4066Sahrens dnode_phys_t *dnp = db->db.db_data; 2659fa9e4066Sahrens for (i = db->db.db_size >> DNODE_SHIFT; i > 0; 2660fa9e4066Sahrens i--, dnp++) { 2661fa9e4066Sahrens if (dnp->dn_type != DMU_OT_NONE) 2662fa9e4066Sahrens fill++; 2663fa9e4066Sahrens } 2664fa9e4066Sahrens } else { 266543466aaeSMax Grossman if (BP_IS_HOLE(bp)) { 266643466aaeSMax Grossman fill = 0; 266743466aaeSMax Grossman } else { 2668fa9e4066Sahrens fill = 1; 2669fa9e4066Sahrens } 267043466aaeSMax Grossman } 2671fa9e4066Sahrens } else { 2672e14bb325SJeff Bonwick blkptr_t *ibp = db->db.db_data; 2673fa9e4066Sahrens ASSERT3U(db->db.db_size, ==, 1<<dn->dn_phys->dn_indblkshift); 2674e14bb325SJeff Bonwick for (i = db->db.db_size >> SPA_BLKPTRSHIFT; i > 0; i--, ibp++) { 2675e14bb325SJeff Bonwick if (BP_IS_HOLE(ibp)) 2676fa9e4066Sahrens continue; 26775d7b4d43SMatthew Ahrens fill += BP_GET_FILL(ibp); 2678fa9e4066Sahrens } 2679fa9e4066Sahrens } 2680744947dcSTom Erickson DB_DNODE_EXIT(db); 2681fa9e4066Sahrens 26825d7b4d43SMatthew Ahrens if (!BP_IS_EMBEDDED(bp)) 2683e14bb325SJeff Bonwick bp->blk_fill = fill; 2684fa9e4066Sahrens 2685fa9e4066Sahrens mutex_exit(&db->db_mtx); 2686fa9e4066Sahrens } 2687fa9e4066Sahrens 268869962b56SMatthew Ahrens /* 268969962b56SMatthew Ahrens * The SPA will call this callback several times for each zio - once 269069962b56SMatthew Ahrens * for every physical child i/o (zio->io_phys_children times). This 269169962b56SMatthew Ahrens * allows the DMU to monitor the progress of each logical i/o. For example, 269269962b56SMatthew Ahrens * there may be 2 copies of an indirect block, or many fragments of a RAID-Z 269369962b56SMatthew Ahrens * block. There may be a long delay before all copies/fragments are completed, 269469962b56SMatthew Ahrens * so this callback allows us to retire dirty space gradually, as the physical 269569962b56SMatthew Ahrens * i/os complete. 269669962b56SMatthew Ahrens */ 269769962b56SMatthew Ahrens /* ARGSUSED */ 269869962b56SMatthew Ahrens static void 269969962b56SMatthew Ahrens dbuf_write_physdone(zio_t *zio, arc_buf_t *buf, void *arg) 270069962b56SMatthew Ahrens { 270169962b56SMatthew Ahrens dmu_buf_impl_t *db = arg; 270269962b56SMatthew Ahrens objset_t *os = db->db_objset; 270369962b56SMatthew Ahrens dsl_pool_t *dp = dmu_objset_pool(os); 270469962b56SMatthew Ahrens dbuf_dirty_record_t *dr; 270569962b56SMatthew Ahrens int delta = 0; 270669962b56SMatthew Ahrens 270769962b56SMatthew Ahrens dr = db->db_data_pending; 270869962b56SMatthew Ahrens ASSERT3U(dr->dr_txg, ==, zio->io_txg); 270969962b56SMatthew Ahrens 271069962b56SMatthew Ahrens /* 271169962b56SMatthew Ahrens * The callback will be called io_phys_children times. Retire one 271269962b56SMatthew Ahrens * portion of our dirty space each time we are called. Any rounding 271369962b56SMatthew Ahrens * error will be cleaned up by dsl_pool_sync()'s call to 271469962b56SMatthew Ahrens * dsl_pool_undirty_space(). 271569962b56SMatthew Ahrens */ 271669962b56SMatthew Ahrens delta = dr->dr_accounted / zio->io_phys_children; 271769962b56SMatthew Ahrens dsl_pool_undirty_space(dp, delta, zio->io_txg); 271869962b56SMatthew Ahrens } 271969962b56SMatthew Ahrens 2720c717a561Smaybee /* ARGSUSED */ 2721c717a561Smaybee static void 2722c717a561Smaybee dbuf_write_done(zio_t *zio, arc_buf_t *buf, void *vdb) 2723c717a561Smaybee { 2724c717a561Smaybee dmu_buf_impl_t *db = vdb; 2725b24ab676SJeff Bonwick blkptr_t *bp_orig = &zio->io_bp_orig; 272643466aaeSMax Grossman blkptr_t *bp = db->db_blkptr; 272743466aaeSMax Grossman objset_t *os = db->db_objset; 272843466aaeSMax Grossman dmu_tx_t *tx = os->os_synctx; 2729c717a561Smaybee dbuf_dirty_record_t **drp, *dr; 2730c717a561Smaybee 2731fb09f5aaSMadhav Suresh ASSERT0(zio->io_error); 2732b24ab676SJeff Bonwick ASSERT(db->db_blkptr == bp); 2733b24ab676SJeff Bonwick 273480901aeaSGeorge Wilson /* 273580901aeaSGeorge Wilson * For nopwrites and rewrites we ensure that the bp matches our 273680901aeaSGeorge Wilson * original and bypass all the accounting. 273780901aeaSGeorge Wilson */ 273880901aeaSGeorge Wilson if (zio->io_flags & (ZIO_FLAG_IO_REWRITE | ZIO_FLAG_NOPWRITE)) { 2739b24ab676SJeff Bonwick ASSERT(BP_EQUAL(bp, bp_orig)); 2740b24ab676SJeff Bonwick } else { 274143466aaeSMax Grossman dsl_dataset_t *ds = os->os_dsl_dataset; 2742b24ab676SJeff Bonwick (void) dsl_dataset_block_kill(ds, bp_orig, tx, B_TRUE); 2743b24ab676SJeff Bonwick dsl_dataset_block_born(ds, bp, tx); 2744b24ab676SJeff Bonwick } 2745c717a561Smaybee 2746c717a561Smaybee mutex_enter(&db->db_mtx); 2747c717a561Smaybee 2748b24ab676SJeff Bonwick DBUF_VERIFY(db); 2749b24ab676SJeff Bonwick 2750c717a561Smaybee drp = &db->db_last_dirty; 275117f17c2dSbonwick while ((dr = *drp) != db->db_data_pending) 275217f17c2dSbonwick drp = &dr->dr_next; 275317f17c2dSbonwick ASSERT(!list_link_active(&dr->dr_dirty_node)); 2754b24ab676SJeff Bonwick ASSERT(dr->dr_dbuf == db); 275517f17c2dSbonwick ASSERT(dr->dr_next == NULL); 275617f17c2dSbonwick *drp = dr->dr_next; 2757c717a561Smaybee 27580a586ceaSMark Shellenbaum #ifdef ZFS_DEBUG 27590a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) { 2760744947dcSTom Erickson dnode_t *dn; 2761744947dcSTom Erickson 2762744947dcSTom Erickson DB_DNODE_ENTER(db); 2763744947dcSTom Erickson dn = DB_DNODE(db); 27640a586ceaSMark Shellenbaum ASSERT(dn->dn_phys->dn_flags & DNODE_FLAG_SPILL_BLKPTR); 27650a586ceaSMark Shellenbaum ASSERT(!(BP_IS_HOLE(db->db_blkptr)) && 27660a586ceaSMark Shellenbaum db->db_blkptr == &dn->dn_phys->dn_spill); 2767744947dcSTom Erickson DB_DNODE_EXIT(db); 27680a586ceaSMark Shellenbaum } 27690a586ceaSMark Shellenbaum #endif 27700a586ceaSMark Shellenbaum 2771c717a561Smaybee if (db->db_level == 0) { 27720a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 2773c717a561Smaybee ASSERT(dr->dt.dl.dr_override_state == DR_NOT_OVERRIDDEN); 277482c9918fSTim Haley if (db->db_state != DB_NOFILL) { 2775c717a561Smaybee if (dr->dt.dl.dr_data != db->db_buf) 277682c9918fSTim Haley VERIFY(arc_buf_remove_ref(dr->dt.dl.dr_data, 27773b2aab18SMatthew Ahrens db)); 2778b24ab676SJeff Bonwick else if (!arc_released(db->db_buf)) 2779c717a561Smaybee arc_set_callback(db->db_buf, dbuf_do_evict, db); 278082c9918fSTim Haley } 2781c717a561Smaybee } else { 2782744947dcSTom Erickson dnode_t *dn; 2783744947dcSTom Erickson 2784744947dcSTom Erickson DB_DNODE_ENTER(db); 2785744947dcSTom Erickson dn = DB_DNODE(db); 2786c717a561Smaybee ASSERT(list_head(&dr->dt.di.dr_children) == NULL); 2787c717a561Smaybee ASSERT3U(db->db.db_size, ==, 1 << dn->dn_phys->dn_indblkshift); 2788c717a561Smaybee if (!BP_IS_HOLE(db->db_blkptr)) { 2789c717a561Smaybee int epbs = 2790c717a561Smaybee dn->dn_phys->dn_indblkshift - SPA_BLKPTRSHIFT; 279143466aaeSMax Grossman ASSERT3U(db->db_blkid, <=, 279243466aaeSMax Grossman dn->dn_phys->dn_maxblkid >> (db->db_level * epbs)); 2793c717a561Smaybee ASSERT3U(BP_GET_LSIZE(db->db_blkptr), ==, 2794c717a561Smaybee db->db.db_size); 27955d7b4d43SMatthew Ahrens if (!arc_released(db->db_buf)) 2796c717a561Smaybee arc_set_callback(db->db_buf, dbuf_do_evict, db); 2797c717a561Smaybee } 2798744947dcSTom Erickson DB_DNODE_EXIT(db); 2799c25056deSgw25295 mutex_destroy(&dr->dt.di.dr_mtx); 2800c25056deSgw25295 list_destroy(&dr->dt.di.dr_children); 2801c717a561Smaybee } 2802c717a561Smaybee kmem_free(dr, sizeof (dbuf_dirty_record_t)); 2803c717a561Smaybee 2804c717a561Smaybee cv_broadcast(&db->db_changed); 2805c717a561Smaybee ASSERT(db->db_dirtycnt > 0); 2806c717a561Smaybee db->db_dirtycnt -= 1; 2807c717a561Smaybee db->db_data_pending = NULL; 280843466aaeSMax Grossman dbuf_rele_and_unlock(db, (void *)(uintptr_t)tx->tx_txg); 2809b24ab676SJeff Bonwick } 2810b24ab676SJeff Bonwick 2811b24ab676SJeff Bonwick static void 2812b24ab676SJeff Bonwick dbuf_write_nofill_ready(zio_t *zio) 2813b24ab676SJeff Bonwick { 2814b24ab676SJeff Bonwick dbuf_write_ready(zio, NULL, zio->io_private); 2815b24ab676SJeff Bonwick } 2816b24ab676SJeff Bonwick 2817b24ab676SJeff Bonwick static void 2818b24ab676SJeff Bonwick dbuf_write_nofill_done(zio_t *zio) 2819b24ab676SJeff Bonwick { 2820b24ab676SJeff Bonwick dbuf_write_done(zio, NULL, zio->io_private); 2821b24ab676SJeff Bonwick } 2822b24ab676SJeff Bonwick 2823b24ab676SJeff Bonwick static void 2824b24ab676SJeff Bonwick dbuf_write_override_ready(zio_t *zio) 2825b24ab676SJeff Bonwick { 2826b24ab676SJeff Bonwick dbuf_dirty_record_t *dr = zio->io_private; 2827b24ab676SJeff Bonwick dmu_buf_impl_t *db = dr->dr_dbuf; 2828b24ab676SJeff Bonwick 2829b24ab676SJeff Bonwick dbuf_write_ready(zio, NULL, db); 2830b24ab676SJeff Bonwick } 2831b24ab676SJeff Bonwick 2832b24ab676SJeff Bonwick static void 2833b24ab676SJeff Bonwick dbuf_write_override_done(zio_t *zio) 2834b24ab676SJeff Bonwick { 2835b24ab676SJeff Bonwick dbuf_dirty_record_t *dr = zio->io_private; 2836b24ab676SJeff Bonwick dmu_buf_impl_t *db = dr->dr_dbuf; 2837b24ab676SJeff Bonwick blkptr_t *obp = &dr->dt.dl.dr_overridden_by; 2838b24ab676SJeff Bonwick 2839b24ab676SJeff Bonwick mutex_enter(&db->db_mtx); 2840b24ab676SJeff Bonwick if (!BP_EQUAL(zio->io_bp, obp)) { 2841b24ab676SJeff Bonwick if (!BP_IS_HOLE(obp)) 2842b24ab676SJeff Bonwick dsl_free(spa_get_dsl(zio->io_spa), zio->io_txg, obp); 2843b24ab676SJeff Bonwick arc_release(dr->dt.dl.dr_data, db); 2844b24ab676SJeff Bonwick } 2845c717a561Smaybee mutex_exit(&db->db_mtx); 2846c717a561Smaybee 2847b24ab676SJeff Bonwick dbuf_write_done(zio, NULL, db); 2848b24ab676SJeff Bonwick } 2849c717a561Smaybee 28503e30c24aSWill Andrews /* Issue I/O to commit a dirty buffer to disk. */ 2851b24ab676SJeff Bonwick static void 2852b24ab676SJeff Bonwick dbuf_write(dbuf_dirty_record_t *dr, arc_buf_t *data, dmu_tx_t *tx) 2853b24ab676SJeff Bonwick { 2854b24ab676SJeff Bonwick dmu_buf_impl_t *db = dr->dr_dbuf; 2855744947dcSTom Erickson dnode_t *dn; 2856744947dcSTom Erickson objset_t *os; 2857b24ab676SJeff Bonwick dmu_buf_impl_t *parent = db->db_parent; 2858b24ab676SJeff Bonwick uint64_t txg = tx->tx_txg; 28597802d7bfSMatthew Ahrens zbookmark_phys_t zb; 2860b24ab676SJeff Bonwick zio_prop_t zp; 2861b24ab676SJeff Bonwick zio_t *zio; 28620a586ceaSMark Shellenbaum int wp_flag = 0; 2863b24ab676SJeff Bonwick 2864744947dcSTom Erickson DB_DNODE_ENTER(db); 2865744947dcSTom Erickson dn = DB_DNODE(db); 2866744947dcSTom Erickson os = dn->dn_objset; 2867744947dcSTom Erickson 2868b24ab676SJeff Bonwick if (db->db_state != DB_NOFILL) { 2869b24ab676SJeff Bonwick if (db->db_level > 0 || dn->dn_type == DMU_OT_DNODE) { 2870b24ab676SJeff Bonwick /* 2871b24ab676SJeff Bonwick * Private object buffers are released here rather 2872b24ab676SJeff Bonwick * than in dbuf_dirty() since they are only modified 2873b24ab676SJeff Bonwick * in the syncing context and we don't want the 2874b24ab676SJeff Bonwick * overhead of making multiple copies of the data. 2875b24ab676SJeff Bonwick */ 2876b24ab676SJeff Bonwick if (BP_IS_HOLE(db->db_blkptr)) { 2877b24ab676SJeff Bonwick arc_buf_thaw(data); 2878b24ab676SJeff Bonwick } else { 28793f9d6ad7SLin Ling dbuf_release_bp(db); 2880b24ab676SJeff Bonwick } 2881b24ab676SJeff Bonwick } 2882b24ab676SJeff Bonwick } 2883b24ab676SJeff Bonwick 2884b24ab676SJeff Bonwick if (parent != dn->dn_dbuf) { 28853e30c24aSWill Andrews /* Our parent is an indirect block. */ 28863e30c24aSWill Andrews /* We have a dirty parent that has been scheduled for write. */ 2887b24ab676SJeff Bonwick ASSERT(parent && parent->db_data_pending); 28883e30c24aSWill Andrews /* Our parent's buffer is one level closer to the dnode. */ 2889b24ab676SJeff Bonwick ASSERT(db->db_level == parent->db_level-1); 28903e30c24aSWill Andrews /* 28913e30c24aSWill Andrews * We're about to modify our parent's db_data by modifying 28923e30c24aSWill Andrews * our block pointer, so the parent must be released. 28933e30c24aSWill Andrews */ 2894b24ab676SJeff Bonwick ASSERT(arc_released(parent->db_buf)); 2895b24ab676SJeff Bonwick zio = parent->db_data_pending->dr_zio; 2896b24ab676SJeff Bonwick } else { 28973e30c24aSWill Andrews /* Our parent is the dnode itself. */ 28980a586ceaSMark Shellenbaum ASSERT((db->db_level == dn->dn_phys->dn_nlevels-1 && 28990a586ceaSMark Shellenbaum db->db_blkid != DMU_SPILL_BLKID) || 29000a586ceaSMark Shellenbaum (db->db_blkid == DMU_SPILL_BLKID && db->db_level == 0)); 29010a586ceaSMark Shellenbaum if (db->db_blkid != DMU_SPILL_BLKID) 2902b24ab676SJeff Bonwick ASSERT3P(db->db_blkptr, ==, 2903b24ab676SJeff Bonwick &dn->dn_phys->dn_blkptr[db->db_blkid]); 2904b24ab676SJeff Bonwick zio = dn->dn_zio; 2905b24ab676SJeff Bonwick } 2906b24ab676SJeff Bonwick 2907b24ab676SJeff Bonwick ASSERT(db->db_level == 0 || data == db->db_buf); 2908b24ab676SJeff Bonwick ASSERT3U(db->db_blkptr->blk_birth, <=, txg); 2909b24ab676SJeff Bonwick ASSERT(zio); 2910b24ab676SJeff Bonwick 2911b24ab676SJeff Bonwick SET_BOOKMARK(&zb, os->os_dsl_dataset ? 2912b24ab676SJeff Bonwick os->os_dsl_dataset->ds_object : DMU_META_OBJSET, 2913b24ab676SJeff Bonwick db->db.db_object, db->db_level, db->db_blkid); 2914b24ab676SJeff Bonwick 29150a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) 29160a586ceaSMark Shellenbaum wp_flag = WP_SPILL; 29170a586ceaSMark Shellenbaum wp_flag |= (db->db_state == DB_NOFILL) ? WP_NOFILL : 0; 29180a586ceaSMark Shellenbaum 29190a586ceaSMark Shellenbaum dmu_write_policy(os, dn, db->db_level, wp_flag, &zp); 2920744947dcSTom Erickson DB_DNODE_EXIT(db); 2921b24ab676SJeff Bonwick 29225d7b4d43SMatthew Ahrens if (db->db_level == 0 && 29235d7b4d43SMatthew Ahrens dr->dt.dl.dr_override_state == DR_OVERRIDDEN) { 29245d7b4d43SMatthew Ahrens /* 29255d7b4d43SMatthew Ahrens * The BP for this block has been provided by open context 29265d7b4d43SMatthew Ahrens * (by dmu_sync() or dmu_buf_write_embedded()). 29275d7b4d43SMatthew Ahrens */ 29285d7b4d43SMatthew Ahrens void *contents = (data != NULL) ? data->b_data : NULL; 29295d7b4d43SMatthew Ahrens 2930b24ab676SJeff Bonwick dr->dr_zio = zio_write(zio, os->os_spa, txg, 29315d7b4d43SMatthew Ahrens db->db_blkptr, contents, db->db.db_size, &zp, 293269962b56SMatthew Ahrens dbuf_write_override_ready, NULL, dbuf_write_override_done, 293369962b56SMatthew Ahrens dr, ZIO_PRIORITY_ASYNC_WRITE, ZIO_FLAG_MUSTSUCCEED, &zb); 2934b24ab676SJeff Bonwick mutex_enter(&db->db_mtx); 2935b24ab676SJeff Bonwick dr->dt.dl.dr_override_state = DR_NOT_OVERRIDDEN; 2936b24ab676SJeff Bonwick zio_write_override(dr->dr_zio, &dr->dt.dl.dr_overridden_by, 293780901aeaSGeorge Wilson dr->dt.dl.dr_copies, dr->dt.dl.dr_nopwrite); 2938b24ab676SJeff Bonwick mutex_exit(&db->db_mtx); 2939b24ab676SJeff Bonwick } else if (db->db_state == DB_NOFILL) { 2940810e43b2SBill Pijewski ASSERT(zp.zp_checksum == ZIO_CHECKSUM_OFF || 2941810e43b2SBill Pijewski zp.zp_checksum == ZIO_CHECKSUM_NOPARITY); 2942b24ab676SJeff Bonwick dr->dr_zio = zio_write(zio, os->os_spa, txg, 2943b24ab676SJeff Bonwick db->db_blkptr, NULL, db->db.db_size, &zp, 294469962b56SMatthew Ahrens dbuf_write_nofill_ready, NULL, dbuf_write_nofill_done, db, 2945b24ab676SJeff Bonwick ZIO_PRIORITY_ASYNC_WRITE, 2946b24ab676SJeff Bonwick ZIO_FLAG_MUSTSUCCEED | ZIO_FLAG_NODATA, &zb); 2947b24ab676SJeff Bonwick } else { 2948b24ab676SJeff Bonwick ASSERT(arc_released(data)); 2949b24ab676SJeff Bonwick dr->dr_zio = arc_write(zio, os->os_spa, txg, 2950aad02571SSaso Kiselkov db->db_blkptr, data, DBUF_IS_L2CACHEABLE(db), 2951aad02571SSaso Kiselkov DBUF_IS_L2COMPRESSIBLE(db), &zp, dbuf_write_ready, 295269962b56SMatthew Ahrens dbuf_write_physdone, dbuf_write_done, db, 295369962b56SMatthew Ahrens ZIO_PRIORITY_ASYNC_WRITE, ZIO_FLAG_MUSTSUCCEED, &zb); 2954b24ab676SJeff Bonwick } 2955fa9e4066Sahrens } 2956