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. 24ad135b5dSChristopher Siden * Copyright (c) 2012 by Delphix. All rights reserved. 25fa9e4066Sahrens */ 26fa9e4066Sahrens 27fa9e4066Sahrens #include <sys/zfs_context.h> 28fa9e4066Sahrens #include <sys/dmu.h> 29fa9e4066Sahrens #include <sys/dmu_impl.h> 30fa9e4066Sahrens #include <sys/dbuf.h> 31fa9e4066Sahrens #include <sys/dmu_objset.h> 32fa9e4066Sahrens #include <sys/dsl_dataset.h> 33fa9e4066Sahrens #include <sys/dsl_dir.h> 34fa9e4066Sahrens #include <sys/dmu_tx.h> 35fa9e4066Sahrens #include <sys/spa.h> 36fa9e4066Sahrens #include <sys/zio.h> 37fa9e4066Sahrens #include <sys/dmu_zfetch.h> 380a586ceaSMark Shellenbaum #include <sys/sa.h> 390a586ceaSMark Shellenbaum #include <sys/sa_impl.h> 40fa9e4066Sahrens 41fa9e4066Sahrens static void dbuf_destroy(dmu_buf_impl_t *db); 42fa9e4066Sahrens static int dbuf_undirty(dmu_buf_impl_t *db, dmu_tx_t *tx); 43088f3894Sahrens static void dbuf_write(dbuf_dirty_record_t *dr, arc_buf_t *data, dmu_tx_t *tx); 44fa9e4066Sahrens 45fa9e4066Sahrens /* 46fa9e4066Sahrens * Global data structures and functions for the dbuf cache. 47fa9e4066Sahrens */ 48fa9e4066Sahrens static kmem_cache_t *dbuf_cache; 49fa9e4066Sahrens 50fa9e4066Sahrens /* ARGSUSED */ 51fa9e4066Sahrens static int 52fa9e4066Sahrens dbuf_cons(void *vdb, void *unused, int kmflag) 53fa9e4066Sahrens { 54fa9e4066Sahrens dmu_buf_impl_t *db = vdb; 55fa9e4066Sahrens bzero(db, sizeof (dmu_buf_impl_t)); 56fa9e4066Sahrens 57fa9e4066Sahrens mutex_init(&db->db_mtx, NULL, MUTEX_DEFAULT, NULL); 58fa9e4066Sahrens cv_init(&db->db_changed, NULL, CV_DEFAULT, NULL); 59fa9e4066Sahrens refcount_create(&db->db_holds); 60fa9e4066Sahrens return (0); 61fa9e4066Sahrens } 62fa9e4066Sahrens 63fa9e4066Sahrens /* ARGSUSED */ 64fa9e4066Sahrens static void 65fa9e4066Sahrens dbuf_dest(void *vdb, void *unused) 66fa9e4066Sahrens { 67fa9e4066Sahrens dmu_buf_impl_t *db = vdb; 68fa9e4066Sahrens mutex_destroy(&db->db_mtx); 69fa9e4066Sahrens cv_destroy(&db->db_changed); 70fa9e4066Sahrens refcount_destroy(&db->db_holds); 71fa9e4066Sahrens } 72fa9e4066Sahrens 73fa9e4066Sahrens /* 74fa9e4066Sahrens * dbuf hash table routines 75fa9e4066Sahrens */ 76fa9e4066Sahrens static dbuf_hash_table_t dbuf_hash_table; 77fa9e4066Sahrens 78fa9e4066Sahrens static uint64_t dbuf_hash_count; 79fa9e4066Sahrens 80fa9e4066Sahrens static uint64_t 81fa9e4066Sahrens dbuf_hash(void *os, uint64_t obj, uint8_t lvl, uint64_t blkid) 82fa9e4066Sahrens { 83fa9e4066Sahrens uintptr_t osv = (uintptr_t)os; 84fa9e4066Sahrens uint64_t crc = -1ULL; 85fa9e4066Sahrens 86fa9e4066Sahrens ASSERT(zfs_crc64_table[128] == ZFS_CRC64_POLY); 87fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (lvl)) & 0xFF]; 88fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (osv >> 6)) & 0xFF]; 89fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (obj >> 0)) & 0xFF]; 90fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (obj >> 8)) & 0xFF]; 91fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (blkid >> 0)) & 0xFF]; 92fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (blkid >> 8)) & 0xFF]; 93fa9e4066Sahrens 94fa9e4066Sahrens crc ^= (osv>>14) ^ (obj>>16) ^ (blkid>>16); 95fa9e4066Sahrens 96fa9e4066Sahrens return (crc); 97fa9e4066Sahrens } 98fa9e4066Sahrens 99fa9e4066Sahrens #define DBUF_HASH(os, obj, level, blkid) dbuf_hash(os, obj, level, blkid); 100fa9e4066Sahrens 101fa9e4066Sahrens #define DBUF_EQUAL(dbuf, os, obj, level, blkid) \ 102fa9e4066Sahrens ((dbuf)->db.db_object == (obj) && \ 103fa9e4066Sahrens (dbuf)->db_objset == (os) && \ 104fa9e4066Sahrens (dbuf)->db_level == (level) && \ 105fa9e4066Sahrens (dbuf)->db_blkid == (blkid)) 106fa9e4066Sahrens 107fa9e4066Sahrens dmu_buf_impl_t * 108fa9e4066Sahrens dbuf_find(dnode_t *dn, uint8_t level, uint64_t blkid) 109fa9e4066Sahrens { 110fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 111503ad85cSMatthew Ahrens objset_t *os = dn->dn_objset; 112fa9e4066Sahrens uint64_t obj = dn->dn_object; 113fa9e4066Sahrens uint64_t hv = DBUF_HASH(os, obj, level, blkid); 114fa9e4066Sahrens uint64_t idx = hv & h->hash_table_mask; 115fa9e4066Sahrens dmu_buf_impl_t *db; 116fa9e4066Sahrens 117fa9e4066Sahrens mutex_enter(DBUF_HASH_MUTEX(h, idx)); 118fa9e4066Sahrens for (db = h->hash_table[idx]; db != NULL; db = db->db_hash_next) { 119fa9e4066Sahrens if (DBUF_EQUAL(db, os, obj, level, blkid)) { 120fa9e4066Sahrens mutex_enter(&db->db_mtx); 121ea8dc4b6Seschrock if (db->db_state != DB_EVICTING) { 122fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 123fa9e4066Sahrens return (db); 124fa9e4066Sahrens } 125fa9e4066Sahrens mutex_exit(&db->db_mtx); 126fa9e4066Sahrens } 127fa9e4066Sahrens } 128fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 129fa9e4066Sahrens return (NULL); 130fa9e4066Sahrens } 131fa9e4066Sahrens 132fa9e4066Sahrens /* 133fa9e4066Sahrens * Insert an entry into the hash table. If there is already an element 134fa9e4066Sahrens * equal to elem in the hash table, then the already existing element 135fa9e4066Sahrens * will be returned and the new element will not be inserted. 136fa9e4066Sahrens * Otherwise returns NULL. 137fa9e4066Sahrens */ 138fa9e4066Sahrens static dmu_buf_impl_t * 139fa9e4066Sahrens dbuf_hash_insert(dmu_buf_impl_t *db) 140fa9e4066Sahrens { 141fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 142503ad85cSMatthew Ahrens objset_t *os = db->db_objset; 143fa9e4066Sahrens uint64_t obj = db->db.db_object; 144fa9e4066Sahrens int level = db->db_level; 145fa9e4066Sahrens uint64_t blkid = db->db_blkid; 146fa9e4066Sahrens uint64_t hv = DBUF_HASH(os, obj, level, blkid); 147fa9e4066Sahrens uint64_t idx = hv & h->hash_table_mask; 148fa9e4066Sahrens dmu_buf_impl_t *dbf; 149fa9e4066Sahrens 150fa9e4066Sahrens mutex_enter(DBUF_HASH_MUTEX(h, idx)); 151fa9e4066Sahrens for (dbf = h->hash_table[idx]; dbf != NULL; dbf = dbf->db_hash_next) { 152fa9e4066Sahrens if (DBUF_EQUAL(dbf, os, obj, level, blkid)) { 153fa9e4066Sahrens mutex_enter(&dbf->db_mtx); 154ea8dc4b6Seschrock if (dbf->db_state != DB_EVICTING) { 155fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 156fa9e4066Sahrens return (dbf); 157fa9e4066Sahrens } 158fa9e4066Sahrens mutex_exit(&dbf->db_mtx); 159fa9e4066Sahrens } 160fa9e4066Sahrens } 161fa9e4066Sahrens 162fa9e4066Sahrens mutex_enter(&db->db_mtx); 163fa9e4066Sahrens db->db_hash_next = h->hash_table[idx]; 164fa9e4066Sahrens h->hash_table[idx] = db; 165fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 166fa9e4066Sahrens atomic_add_64(&dbuf_hash_count, 1); 167fa9e4066Sahrens 168fa9e4066Sahrens return (NULL); 169fa9e4066Sahrens } 170fa9e4066Sahrens 171fa9e4066Sahrens /* 172fa9e4066Sahrens * Remove an entry from the hash table. This operation will 173fa9e4066Sahrens * fail if there are any existing holds on the db. 174fa9e4066Sahrens */ 175fa9e4066Sahrens static void 176fa9e4066Sahrens dbuf_hash_remove(dmu_buf_impl_t *db) 177fa9e4066Sahrens { 178fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 179fa9e4066Sahrens uint64_t hv = DBUF_HASH(db->db_objset, db->db.db_object, 180fa9e4066Sahrens db->db_level, db->db_blkid); 181fa9e4066Sahrens uint64_t idx = hv & h->hash_table_mask; 182fa9e4066Sahrens dmu_buf_impl_t *dbf, **dbp; 183fa9e4066Sahrens 184fa9e4066Sahrens /* 185fa9e4066Sahrens * We musn't hold db_mtx to maintin lock ordering: 186fa9e4066Sahrens * DBUF_HASH_MUTEX > db_mtx. 187fa9e4066Sahrens */ 188fa9e4066Sahrens ASSERT(refcount_is_zero(&db->db_holds)); 189ea8dc4b6Seschrock ASSERT(db->db_state == DB_EVICTING); 190fa9e4066Sahrens ASSERT(!MUTEX_HELD(&db->db_mtx)); 191fa9e4066Sahrens 192fa9e4066Sahrens mutex_enter(DBUF_HASH_MUTEX(h, idx)); 193fa9e4066Sahrens dbp = &h->hash_table[idx]; 194fa9e4066Sahrens while ((dbf = *dbp) != db) { 195fa9e4066Sahrens dbp = &dbf->db_hash_next; 196fa9e4066Sahrens ASSERT(dbf != NULL); 197fa9e4066Sahrens } 198fa9e4066Sahrens *dbp = db->db_hash_next; 199fa9e4066Sahrens db->db_hash_next = NULL; 200fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 201fa9e4066Sahrens atomic_add_64(&dbuf_hash_count, -1); 202fa9e4066Sahrens } 203fa9e4066Sahrens 204ea8dc4b6Seschrock static arc_evict_func_t dbuf_do_evict; 205fa9e4066Sahrens 206fa9e4066Sahrens static void 207fa9e4066Sahrens dbuf_evict_user(dmu_buf_impl_t *db) 208fa9e4066Sahrens { 209fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 210fa9e4066Sahrens 211c717a561Smaybee if (db->db_level != 0 || db->db_evict_func == NULL) 212fa9e4066Sahrens return; 213fa9e4066Sahrens 214c717a561Smaybee if (db->db_user_data_ptr_ptr) 215c717a561Smaybee *db->db_user_data_ptr_ptr = db->db.db_data; 216c717a561Smaybee db->db_evict_func(&db->db, db->db_user_ptr); 217c717a561Smaybee db->db_user_ptr = NULL; 218c717a561Smaybee db->db_user_data_ptr_ptr = NULL; 219c717a561Smaybee db->db_evict_func = NULL; 220fa9e4066Sahrens } 221fa9e4066Sahrens 222744947dcSTom Erickson boolean_t 223744947dcSTom Erickson dbuf_is_metadata(dmu_buf_impl_t *db) 224744947dcSTom Erickson { 225744947dcSTom Erickson if (db->db_level > 0) { 226744947dcSTom Erickson return (B_TRUE); 227744947dcSTom Erickson } else { 228744947dcSTom Erickson boolean_t is_metadata; 229744947dcSTom Erickson 230744947dcSTom Erickson DB_DNODE_ENTER(db); 231ad135b5dSChristopher Siden is_metadata = DMU_OT_IS_METADATA(DB_DNODE(db)->dn_type); 232744947dcSTom Erickson DB_DNODE_EXIT(db); 233744947dcSTom Erickson 234744947dcSTom Erickson return (is_metadata); 235744947dcSTom Erickson } 236744947dcSTom Erickson } 237744947dcSTom Erickson 238ea8dc4b6Seschrock void 239ea8dc4b6Seschrock dbuf_evict(dmu_buf_impl_t *db) 240ea8dc4b6Seschrock { 241ea8dc4b6Seschrock ASSERT(MUTEX_HELD(&db->db_mtx)); 242ea8dc4b6Seschrock ASSERT(db->db_buf == NULL); 243c717a561Smaybee ASSERT(db->db_data_pending == NULL); 244ea8dc4b6Seschrock 245ea8dc4b6Seschrock dbuf_clear(db); 246ea8dc4b6Seschrock dbuf_destroy(db); 247ea8dc4b6Seschrock } 248ea8dc4b6Seschrock 249fa9e4066Sahrens void 250fa9e4066Sahrens dbuf_init(void) 251fa9e4066Sahrens { 252ea8dc4b6Seschrock uint64_t hsize = 1ULL << 16; 253fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 254fa9e4066Sahrens int i; 255fa9e4066Sahrens 256fa9e4066Sahrens /* 257fa9e4066Sahrens * The hash table is big enough to fill all of physical memory 258ea8dc4b6Seschrock * with an average 4K block size. The table will take up 259ea8dc4b6Seschrock * totalmem*sizeof(void*)/4K (i.e. 2MB/GB with 8-byte pointers). 260fa9e4066Sahrens */ 261ea8dc4b6Seschrock while (hsize * 4096 < physmem * PAGESIZE) 262fa9e4066Sahrens hsize <<= 1; 263fa9e4066Sahrens 264ea8dc4b6Seschrock retry: 265fa9e4066Sahrens h->hash_table_mask = hsize - 1; 266ea8dc4b6Seschrock h->hash_table = kmem_zalloc(hsize * sizeof (void *), KM_NOSLEEP); 267ea8dc4b6Seschrock if (h->hash_table == NULL) { 268ea8dc4b6Seschrock /* XXX - we should really return an error instead of assert */ 269ea8dc4b6Seschrock ASSERT(hsize > (1ULL << 10)); 270ea8dc4b6Seschrock hsize >>= 1; 271ea8dc4b6Seschrock goto retry; 272ea8dc4b6Seschrock } 273fa9e4066Sahrens 274fa9e4066Sahrens dbuf_cache = kmem_cache_create("dmu_buf_impl_t", 275fa9e4066Sahrens sizeof (dmu_buf_impl_t), 276fa9e4066Sahrens 0, dbuf_cons, dbuf_dest, NULL, NULL, NULL, 0); 277fa9e4066Sahrens 278fa9e4066Sahrens for (i = 0; i < DBUF_MUTEXES; i++) 279fa9e4066Sahrens mutex_init(&h->hash_mutexes[i], NULL, MUTEX_DEFAULT, NULL); 280fa9e4066Sahrens } 281fa9e4066Sahrens 282fa9e4066Sahrens void 283fa9e4066Sahrens dbuf_fini(void) 284fa9e4066Sahrens { 285fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 286fa9e4066Sahrens int i; 287fa9e4066Sahrens 288fa9e4066Sahrens for (i = 0; i < DBUF_MUTEXES; i++) 289fa9e4066Sahrens mutex_destroy(&h->hash_mutexes[i]); 290fa9e4066Sahrens kmem_free(h->hash_table, (h->hash_table_mask + 1) * sizeof (void *)); 291fa9e4066Sahrens kmem_cache_destroy(dbuf_cache); 292fa9e4066Sahrens } 293fa9e4066Sahrens 294fa9e4066Sahrens /* 295fa9e4066Sahrens * Other stuff. 296fa9e4066Sahrens */ 297fa9e4066Sahrens 2989c9dc39aSek #ifdef ZFS_DEBUG 299fa9e4066Sahrens static void 300fa9e4066Sahrens dbuf_verify(dmu_buf_impl_t *db) 301fa9e4066Sahrens { 302744947dcSTom Erickson dnode_t *dn; 303b24ab676SJeff Bonwick dbuf_dirty_record_t *dr; 304fa9e4066Sahrens 305fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 306fa9e4066Sahrens 307fa9e4066Sahrens if (!(zfs_flags & ZFS_DEBUG_DBUF_VERIFY)) 308fa9e4066Sahrens return; 309fa9e4066Sahrens 310fa9e4066Sahrens ASSERT(db->db_objset != NULL); 311744947dcSTom Erickson DB_DNODE_ENTER(db); 312744947dcSTom Erickson dn = DB_DNODE(db); 313fa9e4066Sahrens if (dn == NULL) { 314fa9e4066Sahrens ASSERT(db->db_parent == NULL); 315fa9e4066Sahrens ASSERT(db->db_blkptr == NULL); 316fa9e4066Sahrens } else { 317fa9e4066Sahrens ASSERT3U(db->db.db_object, ==, dn->dn_object); 318fa9e4066Sahrens ASSERT3P(db->db_objset, ==, dn->dn_objset); 319fa9e4066Sahrens ASSERT3U(db->db_level, <, dn->dn_nlevels); 320744947dcSTom Erickson ASSERT(db->db_blkid == DMU_BONUS_BLKID || 321744947dcSTom Erickson db->db_blkid == DMU_SPILL_BLKID || 322744947dcSTom Erickson !list_is_empty(&dn->dn_dbufs)); 323fa9e4066Sahrens } 3240a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 325fa9e4066Sahrens ASSERT(dn != NULL); 3261934e92fSmaybee ASSERT3U(db->db.db_size, >=, dn->dn_bonuslen); 3270a586ceaSMark Shellenbaum ASSERT3U(db->db.db_offset, ==, DMU_BONUS_BLKID); 3280a586ceaSMark Shellenbaum } else if (db->db_blkid == DMU_SPILL_BLKID) { 3290a586ceaSMark Shellenbaum ASSERT(dn != NULL); 3300a586ceaSMark Shellenbaum ASSERT3U(db->db.db_size, >=, dn->dn_bonuslen); 331fb09f5aaSMadhav Suresh ASSERT0(db->db.db_offset); 332fa9e4066Sahrens } else { 333fa9e4066Sahrens ASSERT3U(db->db.db_offset, ==, db->db_blkid * db->db.db_size); 334fa9e4066Sahrens } 335fa9e4066Sahrens 336b24ab676SJeff Bonwick for (dr = db->db_data_pending; dr != NULL; dr = dr->dr_next) 337b24ab676SJeff Bonwick ASSERT(dr->dr_dbuf == db); 338b24ab676SJeff Bonwick 339b24ab676SJeff Bonwick for (dr = db->db_last_dirty; dr != NULL; dr = dr->dr_next) 340b24ab676SJeff Bonwick ASSERT(dr->dr_dbuf == db); 341b24ab676SJeff Bonwick 34288b7b0f2SMatthew Ahrens /* 34388b7b0f2SMatthew Ahrens * We can't assert that db_size matches dn_datablksz because it 34488b7b0f2SMatthew Ahrens * can be momentarily different when another thread is doing 34588b7b0f2SMatthew Ahrens * dnode_set_blksz(). 34688b7b0f2SMatthew Ahrens */ 34788b7b0f2SMatthew Ahrens if (db->db_level == 0 && db->db.db_object == DMU_META_DNODE_OBJECT) { 348b24ab676SJeff Bonwick dr = db->db_data_pending; 34988b7b0f2SMatthew Ahrens /* 35088b7b0f2SMatthew Ahrens * It should only be modified in syncing context, so 35188b7b0f2SMatthew Ahrens * make sure we only have one copy of the data. 35288b7b0f2SMatthew Ahrens */ 35388b7b0f2SMatthew Ahrens ASSERT(dr == NULL || dr->dt.dl.dr_data == db->db_buf); 354fa9e4066Sahrens } 355fa9e4066Sahrens 356fa9e4066Sahrens /* verify db->db_blkptr */ 357fa9e4066Sahrens if (db->db_blkptr) { 358fa9e4066Sahrens if (db->db_parent == dn->dn_dbuf) { 359fa9e4066Sahrens /* db is pointed to by the dnode */ 360fa9e4066Sahrens /* ASSERT3U(db->db_blkid, <, dn->dn_nblkptr); */ 36114843421SMatthew Ahrens if (DMU_OBJECT_IS_SPECIAL(db->db.db_object)) 362fa9e4066Sahrens ASSERT(db->db_parent == NULL); 363fa9e4066Sahrens else 364fa9e4066Sahrens ASSERT(db->db_parent != NULL); 3650a586ceaSMark Shellenbaum if (db->db_blkid != DMU_SPILL_BLKID) 3660a586ceaSMark Shellenbaum ASSERT3P(db->db_blkptr, ==, 3670a586ceaSMark Shellenbaum &dn->dn_phys->dn_blkptr[db->db_blkid]); 368fa9e4066Sahrens } else { 369fa9e4066Sahrens /* db is pointed to by an indirect block */ 370fa9e4066Sahrens int epb = db->db_parent->db.db_size >> SPA_BLKPTRSHIFT; 371fa9e4066Sahrens ASSERT3U(db->db_parent->db_level, ==, db->db_level+1); 372fa9e4066Sahrens ASSERT3U(db->db_parent->db.db_object, ==, 373fa9e4066Sahrens db->db.db_object); 374fa9e4066Sahrens /* 375fa9e4066Sahrens * dnode_grow_indblksz() can make this fail if we don't 376fa9e4066Sahrens * have the struct_rwlock. XXX indblksz no longer 377fa9e4066Sahrens * grows. safe to do this now? 378fa9e4066Sahrens */ 379744947dcSTom Erickson if (RW_WRITE_HELD(&dn->dn_struct_rwlock)) { 380fa9e4066Sahrens ASSERT3P(db->db_blkptr, ==, 381fa9e4066Sahrens ((blkptr_t *)db->db_parent->db.db_data + 382fa9e4066Sahrens db->db_blkid % epb)); 383fa9e4066Sahrens } 384fa9e4066Sahrens } 385fa9e4066Sahrens } 386fa9e4066Sahrens if ((db->db_blkptr == NULL || BP_IS_HOLE(db->db_blkptr)) && 3873f9d6ad7SLin Ling (db->db_buf == NULL || db->db_buf->b_data) && 3880a586ceaSMark Shellenbaum db->db.db_data && db->db_blkid != DMU_BONUS_BLKID && 389fa9e4066Sahrens db->db_state != DB_FILL && !dn->dn_free_txg) { 390fa9e4066Sahrens /* 391fa9e4066Sahrens * If the blkptr isn't set but they have nonzero data, 392fa9e4066Sahrens * it had better be dirty, otherwise we'll lose that 393fa9e4066Sahrens * data when we evict this buffer. 394fa9e4066Sahrens */ 395fa9e4066Sahrens if (db->db_dirtycnt == 0) { 396fa9e4066Sahrens uint64_t *buf = db->db.db_data; 397fa9e4066Sahrens int i; 398fa9e4066Sahrens 399fa9e4066Sahrens for (i = 0; i < db->db.db_size >> 3; i++) { 400fa9e4066Sahrens ASSERT(buf[i] == 0); 401fa9e4066Sahrens } 402fa9e4066Sahrens } 403fa9e4066Sahrens } 404744947dcSTom Erickson DB_DNODE_EXIT(db); 405fa9e4066Sahrens } 4069c9dc39aSek #endif 407fa9e4066Sahrens 408fa9e4066Sahrens static void 409fa9e4066Sahrens dbuf_update_data(dmu_buf_impl_t *db) 410fa9e4066Sahrens { 411fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 412c717a561Smaybee if (db->db_level == 0 && db->db_user_data_ptr_ptr) { 413fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 414c717a561Smaybee *db->db_user_data_ptr_ptr = db->db.db_data; 415fa9e4066Sahrens } 416fa9e4066Sahrens } 417fa9e4066Sahrens 418fa9e4066Sahrens static void 419fa9e4066Sahrens dbuf_set_data(dmu_buf_impl_t *db, arc_buf_t *buf) 420fa9e4066Sahrens { 421fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 422ea8dc4b6Seschrock ASSERT(db->db_buf == NULL || !arc_has_callback(db->db_buf)); 423fa9e4066Sahrens db->db_buf = buf; 424ea8dc4b6Seschrock if (buf != NULL) { 425ea8dc4b6Seschrock ASSERT(buf->b_data != NULL); 426ea8dc4b6Seschrock db->db.db_data = buf->b_data; 427ea8dc4b6Seschrock if (!arc_released(buf)) 428ea8dc4b6Seschrock arc_set_callback(buf, dbuf_do_evict, db); 429ea8dc4b6Seschrock dbuf_update_data(db); 430ea8dc4b6Seschrock } else { 431ea8dc4b6Seschrock dbuf_evict_user(db); 432ea8dc4b6Seschrock db->db.db_data = NULL; 43382c9918fSTim Haley if (db->db_state != DB_NOFILL) 43482c9918fSTim Haley db->db_state = DB_UNCACHED; 435ea8dc4b6Seschrock } 436fa9e4066Sahrens } 437fa9e4066Sahrens 438c242f9a0Schunli zhang - Sun Microsystems - Irvine United States /* 439c242f9a0Schunli zhang - Sun Microsystems - Irvine United States * Loan out an arc_buf for read. Return the loaned arc_buf. 440c242f9a0Schunli zhang - Sun Microsystems - Irvine United States */ 441c242f9a0Schunli zhang - Sun Microsystems - Irvine United States arc_buf_t * 442c242f9a0Schunli zhang - Sun Microsystems - Irvine United States dbuf_loan_arcbuf(dmu_buf_impl_t *db) 443c242f9a0Schunli zhang - Sun Microsystems - Irvine United States { 444c242f9a0Schunli zhang - Sun Microsystems - Irvine United States arc_buf_t *abuf; 445c242f9a0Schunli zhang - Sun Microsystems - Irvine United States 446c242f9a0Schunli zhang - Sun Microsystems - Irvine United States mutex_enter(&db->db_mtx); 447c242f9a0Schunli zhang - Sun Microsystems - Irvine United States if (arc_released(db->db_buf) || refcount_count(&db->db_holds) > 1) { 448c242f9a0Schunli zhang - Sun Microsystems - Irvine United States int blksz = db->db.db_size; 449744947dcSTom Erickson spa_t *spa; 450744947dcSTom Erickson 451c242f9a0Schunli zhang - Sun Microsystems - Irvine United States mutex_exit(&db->db_mtx); 452744947dcSTom Erickson DB_GET_SPA(&spa, db); 453744947dcSTom Erickson abuf = arc_loan_buf(spa, blksz); 454c242f9a0Schunli zhang - Sun Microsystems - Irvine United States bcopy(db->db.db_data, abuf->b_data, blksz); 455c242f9a0Schunli zhang - Sun Microsystems - Irvine United States } else { 456c242f9a0Schunli zhang - Sun Microsystems - Irvine United States abuf = db->db_buf; 457c242f9a0Schunli zhang - Sun Microsystems - Irvine United States arc_loan_inuse_buf(abuf, db); 458c242f9a0Schunli zhang - Sun Microsystems - Irvine United States dbuf_set_data(db, NULL); 459c242f9a0Schunli zhang - Sun Microsystems - Irvine United States mutex_exit(&db->db_mtx); 460c242f9a0Schunli zhang - Sun Microsystems - Irvine United States } 461c242f9a0Schunli zhang - Sun Microsystems - Irvine United States return (abuf); 462c242f9a0Schunli zhang - Sun Microsystems - Irvine United States } 463c242f9a0Schunli zhang - Sun Microsystems - Irvine United States 464fa9e4066Sahrens uint64_t 465fa9e4066Sahrens dbuf_whichblock(dnode_t *dn, uint64_t offset) 466fa9e4066Sahrens { 467fa9e4066Sahrens if (dn->dn_datablkshift) { 468fa9e4066Sahrens return (offset >> dn->dn_datablkshift); 469fa9e4066Sahrens } else { 470fa9e4066Sahrens ASSERT3U(offset, <, dn->dn_datablksz); 471fa9e4066Sahrens return (0); 472fa9e4066Sahrens } 473fa9e4066Sahrens } 474fa9e4066Sahrens 475fa9e4066Sahrens static void 476fa9e4066Sahrens dbuf_read_done(zio_t *zio, arc_buf_t *buf, void *vdb) 477fa9e4066Sahrens { 478fa9e4066Sahrens dmu_buf_impl_t *db = vdb; 479fa9e4066Sahrens 480fa9e4066Sahrens mutex_enter(&db->db_mtx); 481fa9e4066Sahrens ASSERT3U(db->db_state, ==, DB_READ); 482fa9e4066Sahrens /* 483fa9e4066Sahrens * All reads are synchronous, so we must have a hold on the dbuf 484fa9e4066Sahrens */ 485fa9e4066Sahrens ASSERT(refcount_count(&db->db_holds) > 0); 486ea8dc4b6Seschrock ASSERT(db->db_buf == NULL); 487fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 488c717a561Smaybee if (db->db_level == 0 && db->db_freed_in_flight) { 489fa9e4066Sahrens /* we were freed in flight; disregard any error */ 490fa9e4066Sahrens arc_release(buf, db); 491fa9e4066Sahrens bzero(buf->b_data, db->db.db_size); 4926b4acc8bSahrens arc_buf_freeze(buf); 493c717a561Smaybee db->db_freed_in_flight = FALSE; 494fa9e4066Sahrens dbuf_set_data(db, buf); 495fa9e4066Sahrens db->db_state = DB_CACHED; 496fa9e4066Sahrens } else if (zio == NULL || zio->io_error == 0) { 497fa9e4066Sahrens dbuf_set_data(db, buf); 498fa9e4066Sahrens db->db_state = DB_CACHED; 499fa9e4066Sahrens } else { 5000a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 501fa9e4066Sahrens ASSERT3P(db->db_buf, ==, NULL); 502ea8dc4b6Seschrock VERIFY(arc_buf_remove_ref(buf, db) == 1); 503ea8dc4b6Seschrock db->db_state = DB_UNCACHED; 504fa9e4066Sahrens } 505fa9e4066Sahrens cv_broadcast(&db->db_changed); 5063f9d6ad7SLin Ling dbuf_rele_and_unlock(db, NULL); 507fa9e4066Sahrens } 508fa9e4066Sahrens 509ea8dc4b6Seschrock static void 51013506d1eSmaybee dbuf_read_impl(dmu_buf_impl_t *db, zio_t *zio, uint32_t *flags) 511fa9e4066Sahrens { 512744947dcSTom Erickson dnode_t *dn; 513744947dcSTom Erickson spa_t *spa; 514ea8dc4b6Seschrock zbookmark_t zb; 51513506d1eSmaybee uint32_t aflags = ARC_NOWAIT; 516fa9e4066Sahrens 517744947dcSTom Erickson DB_DNODE_ENTER(db); 518744947dcSTom Erickson dn = DB_DNODE(db); 519fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 520fa9e4066Sahrens /* We need the struct_rwlock to prevent db_blkptr from changing. */ 521088f3894Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 522ea8dc4b6Seschrock ASSERT(MUTEX_HELD(&db->db_mtx)); 523ea8dc4b6Seschrock ASSERT(db->db_state == DB_UNCACHED); 524ea8dc4b6Seschrock ASSERT(db->db_buf == NULL); 525fa9e4066Sahrens 5260a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 527cf04dda1SMark Maybee int bonuslen = MIN(dn->dn_bonuslen, dn->dn_phys->dn_bonuslen); 5281934e92fSmaybee 5291934e92fSmaybee ASSERT3U(bonuslen, <=, db->db.db_size); 530ea8dc4b6Seschrock db->db.db_data = zio_buf_alloc(DN_MAX_BONUSLEN); 5315a98e54bSBrendan Gregg - Sun Microsystems arc_space_consume(DN_MAX_BONUSLEN, ARC_SPACE_OTHER); 5321934e92fSmaybee if (bonuslen < DN_MAX_BONUSLEN) 533ea8dc4b6Seschrock bzero(db->db.db_data, DN_MAX_BONUSLEN); 534cf04dda1SMark Maybee if (bonuslen) 535cf04dda1SMark Maybee bcopy(DN_BONUS(dn->dn_phys), db->db.db_data, bonuslen); 536744947dcSTom Erickson DB_DNODE_EXIT(db); 537ea8dc4b6Seschrock dbuf_update_data(db); 538fa9e4066Sahrens db->db_state = DB_CACHED; 539fa9e4066Sahrens mutex_exit(&db->db_mtx); 540fa9e4066Sahrens return; 541fa9e4066Sahrens } 542fa9e4066Sahrens 5431c8564a7SMark Maybee /* 5441c8564a7SMark Maybee * Recheck BP_IS_HOLE() after dnode_block_freed() in case dnode_sync() 5451c8564a7SMark Maybee * processes the delete record and clears the bp while we are waiting 5461c8564a7SMark Maybee * for the dn_mtx (resulting in a "no" from block_freed). 5471c8564a7SMark Maybee */ 548088f3894Sahrens if (db->db_blkptr == NULL || BP_IS_HOLE(db->db_blkptr) || 5491c8564a7SMark Maybee (db->db_level == 0 && (dnode_block_freed(dn, db->db_blkid) || 5501c8564a7SMark Maybee BP_IS_HOLE(db->db_blkptr)))) { 551ad23a2dbSjohansen arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 552ad23a2dbSjohansen 553088f3894Sahrens dbuf_set_data(db, arc_buf_alloc(dn->dn_objset->os_spa, 554ad23a2dbSjohansen db->db.db_size, db, type)); 555744947dcSTom Erickson DB_DNODE_EXIT(db); 556fa9e4066Sahrens bzero(db->db.db_data, db->db.db_size); 557fa9e4066Sahrens db->db_state = DB_CACHED; 55813506d1eSmaybee *flags |= DB_RF_CACHED; 559fa9e4066Sahrens mutex_exit(&db->db_mtx); 560fa9e4066Sahrens return; 561fa9e4066Sahrens } 562fa9e4066Sahrens 563744947dcSTom Erickson spa = dn->dn_objset->os_spa; 564744947dcSTom Erickson DB_DNODE_EXIT(db); 565744947dcSTom Erickson 566fa9e4066Sahrens db->db_state = DB_READ; 567fa9e4066Sahrens mutex_exit(&db->db_mtx); 568fa9e4066Sahrens 5693baa08fcSek if (DBUF_IS_L2CACHEABLE(db)) 5703baa08fcSek aflags |= ARC_L2CACHE; 5713baa08fcSek 572b24ab676SJeff Bonwick SET_BOOKMARK(&zb, db->db_objset->os_dsl_dataset ? 573b24ab676SJeff Bonwick db->db_objset->os_dsl_dataset->ds_object : DMU_META_OBJSET, 574b24ab676SJeff Bonwick db->db.db_object, db->db_level, db->db_blkid); 575ea8dc4b6Seschrock 576ea8dc4b6Seschrock dbuf_add_ref(db, NULL); 577088f3894Sahrens 578*1b912ec7SGeorge Wilson (void) arc_read(zio, spa, db->db_blkptr, 579fa9e4066Sahrens dbuf_read_done, db, ZIO_PRIORITY_SYNC_READ, 58013506d1eSmaybee (*flags & DB_RF_CANFAIL) ? ZIO_FLAG_CANFAIL : ZIO_FLAG_MUSTSUCCEED, 58113506d1eSmaybee &aflags, &zb); 58213506d1eSmaybee if (aflags & ARC_CACHED) 58313506d1eSmaybee *flags |= DB_RF_CACHED; 584fa9e4066Sahrens } 585fa9e4066Sahrens 586ea8dc4b6Seschrock int 587ea8dc4b6Seschrock dbuf_read(dmu_buf_impl_t *db, zio_t *zio, uint32_t flags) 588fa9e4066Sahrens { 589ea8dc4b6Seschrock int err = 0; 590ea8dc4b6Seschrock int havepzio = (zio != NULL); 59113506d1eSmaybee int prefetch; 592744947dcSTom Erickson dnode_t *dn; 593fa9e4066Sahrens 594fa9e4066Sahrens /* 595fa9e4066Sahrens * We don't have to hold the mutex to check db_state because it 596fa9e4066Sahrens * can't be freed while we have a hold on the buffer. 597fa9e4066Sahrens */ 598fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 599fa9e4066Sahrens 60082c9918fSTim Haley if (db->db_state == DB_NOFILL) 60182c9918fSTim Haley return (EIO); 60282c9918fSTim Haley 603744947dcSTom Erickson DB_DNODE_ENTER(db); 604744947dcSTom Erickson dn = DB_DNODE(db); 605ea8dc4b6Seschrock if ((flags & DB_RF_HAVESTRUCT) == 0) 606744947dcSTom Erickson rw_enter(&dn->dn_struct_rwlock, RW_READER); 607ea8dc4b6Seschrock 6080a586ceaSMark Shellenbaum prefetch = db->db_level == 0 && db->db_blkid != DMU_BONUS_BLKID && 609744947dcSTom Erickson (flags & DB_RF_NOPREFETCH) == 0 && dn != NULL && 6103baa08fcSek DBUF_IS_CACHEABLE(db); 61113506d1eSmaybee 612ea8dc4b6Seschrock mutex_enter(&db->db_mtx); 613ea8dc4b6Seschrock if (db->db_state == DB_CACHED) { 614ea8dc4b6Seschrock mutex_exit(&db->db_mtx); 61513506d1eSmaybee if (prefetch) 616744947dcSTom Erickson dmu_zfetch(&dn->dn_zfetch, db->db.db_offset, 61713506d1eSmaybee db->db.db_size, TRUE); 618fa9e4066Sahrens if ((flags & DB_RF_HAVESTRUCT) == 0) 619744947dcSTom Erickson rw_exit(&dn->dn_struct_rwlock); 620744947dcSTom Erickson DB_DNODE_EXIT(db); 621ea8dc4b6Seschrock } else if (db->db_state == DB_UNCACHED) { 622744947dcSTom Erickson spa_t *spa = dn->dn_objset->os_spa; 623744947dcSTom Erickson 624744947dcSTom Erickson if (zio == NULL) 625744947dcSTom Erickson zio = zio_root(spa, NULL, NULL, ZIO_FLAG_CANFAIL); 62613506d1eSmaybee dbuf_read_impl(db, zio, &flags); 62713506d1eSmaybee 628ea8dc4b6Seschrock /* dbuf_read_impl has dropped db_mtx for us */ 629ea8dc4b6Seschrock 63013506d1eSmaybee if (prefetch) 631744947dcSTom Erickson dmu_zfetch(&dn->dn_zfetch, db->db.db_offset, 63213506d1eSmaybee db->db.db_size, flags & DB_RF_CACHED); 633ea8dc4b6Seschrock 634fa9e4066Sahrens if ((flags & DB_RF_HAVESTRUCT) == 0) 635744947dcSTom Erickson rw_exit(&dn->dn_struct_rwlock); 636744947dcSTom Erickson DB_DNODE_EXIT(db); 637fa9e4066Sahrens 638ea8dc4b6Seschrock if (!havepzio) 639ea8dc4b6Seschrock err = zio_wait(zio); 640ea8dc4b6Seschrock } else { 64113506d1eSmaybee mutex_exit(&db->db_mtx); 64213506d1eSmaybee if (prefetch) 643744947dcSTom Erickson dmu_zfetch(&dn->dn_zfetch, db->db.db_offset, 64413506d1eSmaybee db->db.db_size, TRUE); 645ea8dc4b6Seschrock if ((flags & DB_RF_HAVESTRUCT) == 0) 646744947dcSTom Erickson rw_exit(&dn->dn_struct_rwlock); 647744947dcSTom Erickson DB_DNODE_EXIT(db); 64813506d1eSmaybee 64913506d1eSmaybee mutex_enter(&db->db_mtx); 650ea8dc4b6Seschrock if ((flags & DB_RF_NEVERWAIT) == 0) { 651ea8dc4b6Seschrock while (db->db_state == DB_READ || 652ea8dc4b6Seschrock db->db_state == DB_FILL) { 653ea8dc4b6Seschrock ASSERT(db->db_state == DB_READ || 654ea8dc4b6Seschrock (flags & DB_RF_HAVESTRUCT) == 0); 655ea8dc4b6Seschrock cv_wait(&db->db_changed, &db->db_mtx); 656ea8dc4b6Seschrock } 657ea8dc4b6Seschrock if (db->db_state == DB_UNCACHED) 658ea8dc4b6Seschrock err = EIO; 659ea8dc4b6Seschrock } 660ea8dc4b6Seschrock mutex_exit(&db->db_mtx); 661fa9e4066Sahrens } 662fa9e4066Sahrens 663ea8dc4b6Seschrock ASSERT(err || havepzio || db->db_state == DB_CACHED); 664ea8dc4b6Seschrock return (err); 665fa9e4066Sahrens } 666fa9e4066Sahrens 667fa9e4066Sahrens static void 668fa9e4066Sahrens dbuf_noread(dmu_buf_impl_t *db) 669fa9e4066Sahrens { 670fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 6710a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 672fa9e4066Sahrens mutex_enter(&db->db_mtx); 673fa9e4066Sahrens while (db->db_state == DB_READ || db->db_state == DB_FILL) 674fa9e4066Sahrens cv_wait(&db->db_changed, &db->db_mtx); 675fa9e4066Sahrens if (db->db_state == DB_UNCACHED) { 676ad23a2dbSjohansen arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 677744947dcSTom Erickson spa_t *spa; 678ad23a2dbSjohansen 679ea8dc4b6Seschrock ASSERT(db->db_buf == NULL); 680fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 681744947dcSTom Erickson DB_GET_SPA(&spa, db); 682744947dcSTom Erickson dbuf_set_data(db, arc_buf_alloc(spa, db->db.db_size, db, type)); 683fa9e4066Sahrens db->db_state = DB_FILL; 68482c9918fSTim Haley } else if (db->db_state == DB_NOFILL) { 68582c9918fSTim Haley dbuf_set_data(db, NULL); 686fa9e4066Sahrens } else { 687fa9e4066Sahrens ASSERT3U(db->db_state, ==, DB_CACHED); 688fa9e4066Sahrens } 689fa9e4066Sahrens mutex_exit(&db->db_mtx); 690fa9e4066Sahrens } 691fa9e4066Sahrens 692fa9e4066Sahrens /* 693fa9e4066Sahrens * This is our just-in-time copy function. It makes a copy of 694fa9e4066Sahrens * buffers, that have been modified in a previous transaction 695fa9e4066Sahrens * group, before we modify them in the current active group. 696fa9e4066Sahrens * 697fa9e4066Sahrens * This function is used in two places: when we are dirtying a 698fa9e4066Sahrens * buffer for the first time in a txg, and when we are freeing 699fa9e4066Sahrens * a range in a dnode that includes this buffer. 700fa9e4066Sahrens * 701fa9e4066Sahrens * Note that when we are called from dbuf_free_range() we do 702fa9e4066Sahrens * not put a hold on the buffer, we just traverse the active 703fa9e4066Sahrens * dbuf list for the dnode. 704fa9e4066Sahrens */ 705fa9e4066Sahrens static void 706fa9e4066Sahrens dbuf_fix_old_data(dmu_buf_impl_t *db, uint64_t txg) 707fa9e4066Sahrens { 708c717a561Smaybee dbuf_dirty_record_t *dr = db->db_last_dirty; 709fa9e4066Sahrens 710fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 711fa9e4066Sahrens ASSERT(db->db.db_data != NULL); 712c717a561Smaybee ASSERT(db->db_level == 0); 713c717a561Smaybee ASSERT(db->db.db_object != DMU_META_DNODE_OBJECT); 714fa9e4066Sahrens 7154d31c452Smaybee if (dr == NULL || 7164d31c452Smaybee (dr->dt.dl.dr_data != 7170a586ceaSMark Shellenbaum ((db->db_blkid == DMU_BONUS_BLKID) ? db->db.db_data : db->db_buf))) 718fa9e4066Sahrens return; 719fa9e4066Sahrens 720fa9e4066Sahrens /* 721c717a561Smaybee * If the last dirty record for this dbuf has not yet synced 722c717a561Smaybee * and its referencing the dbuf data, either: 723744947dcSTom Erickson * reset the reference to point to a new copy, 724c717a561Smaybee * or (if there a no active holders) 725c717a561Smaybee * just null out the current db_data pointer. 726fa9e4066Sahrens */ 727c717a561Smaybee ASSERT(dr->dr_txg >= txg - 2); 7280a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 729c717a561Smaybee /* Note that the data bufs here are zio_bufs */ 730c717a561Smaybee dr->dt.dl.dr_data = zio_buf_alloc(DN_MAX_BONUSLEN); 7315a98e54bSBrendan Gregg - Sun Microsystems arc_space_consume(DN_MAX_BONUSLEN, ARC_SPACE_OTHER); 732c717a561Smaybee bcopy(db->db.db_data, dr->dt.dl.dr_data, DN_MAX_BONUSLEN); 733c717a561Smaybee } else if (refcount_count(&db->db_holds) > db->db_dirtycnt) { 734c717a561Smaybee int size = db->db.db_size; 735c717a561Smaybee arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 736744947dcSTom Erickson spa_t *spa; 737744947dcSTom Erickson 738744947dcSTom Erickson DB_GET_SPA(&spa, db); 739744947dcSTom Erickson dr->dt.dl.dr_data = arc_buf_alloc(spa, size, db, type); 740c717a561Smaybee bcopy(db->db.db_data, dr->dt.dl.dr_data->b_data, size); 741c717a561Smaybee } else { 742c717a561Smaybee dbuf_set_data(db, NULL); 743fa9e4066Sahrens } 744fa9e4066Sahrens } 745fa9e4066Sahrens 746c717a561Smaybee void 747c717a561Smaybee dbuf_unoverride(dbuf_dirty_record_t *dr) 748ea8dc4b6Seschrock { 749c717a561Smaybee dmu_buf_impl_t *db = dr->dr_dbuf; 750b24ab676SJeff Bonwick blkptr_t *bp = &dr->dt.dl.dr_overridden_by; 751c717a561Smaybee uint64_t txg = dr->dr_txg; 752ea8dc4b6Seschrock 753ea8dc4b6Seschrock ASSERT(MUTEX_HELD(&db->db_mtx)); 754c717a561Smaybee ASSERT(dr->dt.dl.dr_override_state != DR_IN_DMU_SYNC); 755c717a561Smaybee ASSERT(db->db_level == 0); 756ea8dc4b6Seschrock 7570a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID || 758c717a561Smaybee dr->dt.dl.dr_override_state == DR_NOT_OVERRIDDEN) 759c717a561Smaybee return; 760ea8dc4b6Seschrock 761b24ab676SJeff Bonwick ASSERT(db->db_data_pending != dr); 762b24ab676SJeff Bonwick 763c717a561Smaybee /* free this block */ 76480901aeaSGeorge Wilson if (!BP_IS_HOLE(bp) && !dr->dt.dl.dr_nopwrite) { 765744947dcSTom Erickson spa_t *spa; 766b24ab676SJeff Bonwick 767744947dcSTom Erickson DB_GET_SPA(&spa, db); 768744947dcSTom Erickson zio_free(spa, txg, bp); 769744947dcSTom Erickson } 770c717a561Smaybee dr->dt.dl.dr_override_state = DR_NOT_OVERRIDDEN; 77180901aeaSGeorge Wilson dr->dt.dl.dr_nopwrite = B_FALSE; 77280901aeaSGeorge Wilson 773c717a561Smaybee /* 774c717a561Smaybee * Release the already-written buffer, so we leave it in 775c717a561Smaybee * a consistent dirty state. Note that all callers are 776c717a561Smaybee * modifying the buffer, so they will immediately do 777c717a561Smaybee * another (redundant) arc_release(). Therefore, leave 778c717a561Smaybee * the buf thawed to save the effort of freezing & 779c717a561Smaybee * immediately re-thawing it. 780c717a561Smaybee */ 781c717a561Smaybee arc_release(dr->dt.dl.dr_data, db); 782fa9e4066Sahrens } 783fa9e4066Sahrens 784cdb0ab79Smaybee /* 785cdb0ab79Smaybee * Evict (if its unreferenced) or clear (if its referenced) any level-0 786cdb0ab79Smaybee * data blocks in the free range, so that any future readers will find 787cdb0ab79Smaybee * empty blocks. Also, if we happen accross any level-1 dbufs in the 788cdb0ab79Smaybee * range that have not already been marked dirty, mark them dirty so 789cdb0ab79Smaybee * they stay in memory. 790cdb0ab79Smaybee */ 791fa9e4066Sahrens void 792cdb0ab79Smaybee dbuf_free_range(dnode_t *dn, uint64_t start, uint64_t end, dmu_tx_t *tx) 793fa9e4066Sahrens { 794fa9e4066Sahrens dmu_buf_impl_t *db, *db_next; 795fa9e4066Sahrens uint64_t txg = tx->tx_txg; 796cdb0ab79Smaybee int epbs = dn->dn_indblkshift - SPA_BLKPTRSHIFT; 797cdb0ab79Smaybee uint64_t first_l1 = start >> epbs; 798cdb0ab79Smaybee uint64_t last_l1 = end >> epbs; 799fa9e4066Sahrens 8000a586ceaSMark Shellenbaum if (end > dn->dn_maxblkid && (end != DMU_SPILL_BLKID)) { 801cdb0ab79Smaybee end = dn->dn_maxblkid; 802cdb0ab79Smaybee last_l1 = end >> epbs; 803cdb0ab79Smaybee } 804cdb0ab79Smaybee dprintf_dnode(dn, "start=%llu end=%llu\n", start, end); 805fa9e4066Sahrens mutex_enter(&dn->dn_dbufs_mtx); 806fa9e4066Sahrens for (db = list_head(&dn->dn_dbufs); db; db = db_next) { 807fa9e4066Sahrens db_next = list_next(&dn->dn_dbufs, db); 8080a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 809cdb0ab79Smaybee 810cdb0ab79Smaybee if (db->db_level == 1 && 811cdb0ab79Smaybee db->db_blkid >= first_l1 && db->db_blkid <= last_l1) { 812cdb0ab79Smaybee mutex_enter(&db->db_mtx); 813cdb0ab79Smaybee if (db->db_last_dirty && 814cdb0ab79Smaybee db->db_last_dirty->dr_txg < txg) { 815cdb0ab79Smaybee dbuf_add_ref(db, FTAG); 816cdb0ab79Smaybee mutex_exit(&db->db_mtx); 817cdb0ab79Smaybee dbuf_will_dirty(db, tx); 818cdb0ab79Smaybee dbuf_rele(db, FTAG); 819cdb0ab79Smaybee } else { 820cdb0ab79Smaybee mutex_exit(&db->db_mtx); 821cdb0ab79Smaybee } 822cdb0ab79Smaybee } 823cdb0ab79Smaybee 824ea8dc4b6Seschrock if (db->db_level != 0) 825fa9e4066Sahrens continue; 826fa9e4066Sahrens dprintf_dbuf(db, "found buf %s\n", ""); 827cdb0ab79Smaybee if (db->db_blkid < start || db->db_blkid > end) 828fa9e4066Sahrens continue; 829fa9e4066Sahrens 830fa9e4066Sahrens /* found a level 0 buffer in the range */ 831fa9e4066Sahrens if (dbuf_undirty(db, tx)) 832fa9e4066Sahrens continue; 833fa9e4066Sahrens 834fa9e4066Sahrens mutex_enter(&db->db_mtx); 835ea8dc4b6Seschrock if (db->db_state == DB_UNCACHED || 83682c9918fSTim Haley db->db_state == DB_NOFILL || 837ea8dc4b6Seschrock db->db_state == DB_EVICTING) { 838fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 839fa9e4066Sahrens mutex_exit(&db->db_mtx); 840fa9e4066Sahrens continue; 841fa9e4066Sahrens } 842c543ec06Sahrens if (db->db_state == DB_READ || db->db_state == DB_FILL) { 843c543ec06Sahrens /* will be handled in dbuf_read_done or dbuf_rele */ 844c717a561Smaybee db->db_freed_in_flight = TRUE; 845fa9e4066Sahrens mutex_exit(&db->db_mtx); 846fa9e4066Sahrens continue; 847fa9e4066Sahrens } 848ea8dc4b6Seschrock if (refcount_count(&db->db_holds) == 0) { 849ea8dc4b6Seschrock ASSERT(db->db_buf); 850ea8dc4b6Seschrock dbuf_clear(db); 851ea8dc4b6Seschrock continue; 852ea8dc4b6Seschrock } 853c717a561Smaybee /* The dbuf is referenced */ 854fa9e4066Sahrens 855c717a561Smaybee if (db->db_last_dirty != NULL) { 856c717a561Smaybee dbuf_dirty_record_t *dr = db->db_last_dirty; 857c717a561Smaybee 858c717a561Smaybee if (dr->dr_txg == txg) { 85944eda4d7Smaybee /* 860c717a561Smaybee * This buffer is "in-use", re-adjust the file 861c717a561Smaybee * size to reflect that this buffer may 862c717a561Smaybee * contain new data when we sync. 86344eda4d7Smaybee */ 86406e0070dSMark Shellenbaum if (db->db_blkid != DMU_SPILL_BLKID && 86506e0070dSMark Shellenbaum db->db_blkid > dn->dn_maxblkid) 866c717a561Smaybee dn->dn_maxblkid = db->db_blkid; 867c717a561Smaybee dbuf_unoverride(dr); 868c717a561Smaybee } else { 869c717a561Smaybee /* 870c717a561Smaybee * This dbuf is not dirty in the open context. 871c717a561Smaybee * Either uncache it (if its not referenced in 872c717a561Smaybee * the open context) or reset its contents to 873c717a561Smaybee * empty. 874c717a561Smaybee */ 875c717a561Smaybee dbuf_fix_old_data(db, txg); 87644eda4d7Smaybee } 877ea8dc4b6Seschrock } 878c717a561Smaybee /* clear the contents if its cached */ 879ea8dc4b6Seschrock if (db->db_state == DB_CACHED) { 880ea8dc4b6Seschrock ASSERT(db->db.db_data != NULL); 881fa9e4066Sahrens arc_release(db->db_buf, db); 882fa9e4066Sahrens bzero(db->db.db_data, db->db.db_size); 8836b4acc8bSahrens arc_buf_freeze(db->db_buf); 884fa9e4066Sahrens } 885ea8dc4b6Seschrock 886fa9e4066Sahrens mutex_exit(&db->db_mtx); 887fa9e4066Sahrens } 888fa9e4066Sahrens mutex_exit(&dn->dn_dbufs_mtx); 889fa9e4066Sahrens } 890fa9e4066Sahrens 891fa9e4066Sahrens static int 8921934e92fSmaybee dbuf_block_freeable(dmu_buf_impl_t *db) 893fa9e4066Sahrens { 894fa9e4066Sahrens dsl_dataset_t *ds = db->db_objset->os_dsl_dataset; 895fa9e4066Sahrens uint64_t birth_txg = 0; 896fa9e4066Sahrens 897fa9e4066Sahrens /* 898fa9e4066Sahrens * We don't need any locking to protect db_blkptr: 899c717a561Smaybee * If it's syncing, then db_last_dirty will be set 900c717a561Smaybee * so we'll ignore db_blkptr. 901fa9e4066Sahrens */ 902c717a561Smaybee ASSERT(MUTEX_HELD(&db->db_mtx)); 903c717a561Smaybee if (db->db_last_dirty) 904c717a561Smaybee birth_txg = db->db_last_dirty->dr_txg; 905fa9e4066Sahrens else if (db->db_blkptr) 906fa9e4066Sahrens birth_txg = db->db_blkptr->blk_birth; 907fa9e4066Sahrens 908837b568bSGeorge Wilson /* 909837b568bSGeorge Wilson * If we don't exist or are in a snapshot, we can't be freed. 910837b568bSGeorge Wilson * Don't pass the bp to dsl_dataset_block_freeable() since we 911837b568bSGeorge Wilson * are holding the db_mtx lock and might deadlock if we are 912837b568bSGeorge Wilson * prefetching a dedup-ed block. 913837b568bSGeorge Wilson */ 914fa9e4066Sahrens if (birth_txg) 9151934e92fSmaybee return (ds == NULL || 916837b568bSGeorge Wilson dsl_dataset_block_freeable(ds, NULL, birth_txg)); 917fa9e4066Sahrens else 9181934e92fSmaybee return (FALSE); 919fa9e4066Sahrens } 920fa9e4066Sahrens 921fa9e4066Sahrens void 922fa9e4066Sahrens dbuf_new_size(dmu_buf_impl_t *db, int size, dmu_tx_t *tx) 923fa9e4066Sahrens { 924fa9e4066Sahrens arc_buf_t *buf, *obuf; 925fa9e4066Sahrens int osize = db->db.db_size; 926ad23a2dbSjohansen arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 927744947dcSTom Erickson dnode_t *dn; 928fa9e4066Sahrens 9290a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 930ea8dc4b6Seschrock 931744947dcSTom Erickson DB_DNODE_ENTER(db); 932744947dcSTom Erickson dn = DB_DNODE(db); 933744947dcSTom Erickson 934fa9e4066Sahrens /* XXX does *this* func really need the lock? */ 935744947dcSTom Erickson ASSERT(RW_WRITE_HELD(&dn->dn_struct_rwlock)); 936fa9e4066Sahrens 937fa9e4066Sahrens /* 938fa9e4066Sahrens * This call to dbuf_will_dirty() with the dn_struct_rwlock held 939fa9e4066Sahrens * is OK, because there can be no other references to the db 940fa9e4066Sahrens * when we are changing its size, so no concurrent DB_FILL can 941fa9e4066Sahrens * be happening. 942fa9e4066Sahrens */ 943ea8dc4b6Seschrock /* 944ea8dc4b6Seschrock * XXX we should be doing a dbuf_read, checking the return 945ea8dc4b6Seschrock * value and returning that up to our callers 946ea8dc4b6Seschrock */ 947fa9e4066Sahrens dbuf_will_dirty(db, tx); 948fa9e4066Sahrens 949fa9e4066Sahrens /* create the data buffer for the new block */ 950744947dcSTom Erickson buf = arc_buf_alloc(dn->dn_objset->os_spa, size, db, type); 951fa9e4066Sahrens 952fa9e4066Sahrens /* copy old block data to the new block */ 953fa9e4066Sahrens obuf = db->db_buf; 954f65e61c0Sahrens bcopy(obuf->b_data, buf->b_data, MIN(osize, size)); 955fa9e4066Sahrens /* zero the remainder */ 956f65e61c0Sahrens if (size > osize) 957f65e61c0Sahrens bzero((uint8_t *)buf->b_data + osize, size - osize); 958fa9e4066Sahrens 959fa9e4066Sahrens mutex_enter(&db->db_mtx); 960fa9e4066Sahrens dbuf_set_data(db, buf); 961ea8dc4b6Seschrock VERIFY(arc_buf_remove_ref(obuf, db) == 1); 962fa9e4066Sahrens db->db.db_size = size; 963fa9e4066Sahrens 964c717a561Smaybee if (db->db_level == 0) { 965c717a561Smaybee ASSERT3U(db->db_last_dirty->dr_txg, ==, tx->tx_txg); 966c717a561Smaybee db->db_last_dirty->dt.dl.dr_data = buf; 967c717a561Smaybee } 968fa9e4066Sahrens mutex_exit(&db->db_mtx); 969fa9e4066Sahrens 970744947dcSTom Erickson dnode_willuse_space(dn, size-osize, tx); 971744947dcSTom Erickson DB_DNODE_EXIT(db); 972fa9e4066Sahrens } 973fa9e4066Sahrens 9743f9d6ad7SLin Ling void 9753f9d6ad7SLin Ling dbuf_release_bp(dmu_buf_impl_t *db) 9763f9d6ad7SLin Ling { 977744947dcSTom Erickson objset_t *os; 9783f9d6ad7SLin Ling 979744947dcSTom Erickson DB_GET_OBJSET(&os, db); 9803f9d6ad7SLin Ling ASSERT(dsl_pool_sync_context(dmu_objset_pool(os))); 9813f9d6ad7SLin Ling ASSERT(arc_released(os->os_phys_buf) || 9823f9d6ad7SLin Ling list_link_active(&os->os_dsl_dataset->ds_synced_link)); 9833f9d6ad7SLin Ling ASSERT(db->db_parent == NULL || arc_released(db->db_parent->db_buf)); 9843f9d6ad7SLin Ling 985*1b912ec7SGeorge Wilson (void) arc_release(db->db_buf, db); 9863f9d6ad7SLin Ling } 9873f9d6ad7SLin Ling 988c717a561Smaybee dbuf_dirty_record_t * 989fa9e4066Sahrens dbuf_dirty(dmu_buf_impl_t *db, dmu_tx_t *tx) 990fa9e4066Sahrens { 991744947dcSTom Erickson dnode_t *dn; 992744947dcSTom Erickson objset_t *os; 993c717a561Smaybee dbuf_dirty_record_t **drp, *dr; 994fa9e4066Sahrens int drop_struct_lock = FALSE; 995d3469faaSMark Maybee boolean_t do_free_accounting = B_FALSE; 996fa9e4066Sahrens int txgoff = tx->tx_txg & TXG_MASK; 997fa9e4066Sahrens 998fa9e4066Sahrens ASSERT(tx->tx_txg != 0); 999fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 10009c9dc39aSek DMU_TX_DIRTY_BUF(tx, db); 1001fa9e4066Sahrens 1002744947dcSTom Erickson DB_DNODE_ENTER(db); 1003744947dcSTom Erickson dn = DB_DNODE(db); 1004fa9e4066Sahrens /* 1005fa9e4066Sahrens * Shouldn't dirty a regular buffer in syncing context. Private 1006fa9e4066Sahrens * objects may be dirtied in syncing context, but only if they 1007fa9e4066Sahrens * were already pre-dirtied in open context. 1008fa9e4066Sahrens */ 1009c717a561Smaybee ASSERT(!dmu_tx_is_syncing(tx) || 1010c717a561Smaybee BP_IS_HOLE(dn->dn_objset->os_rootbp) || 101114843421SMatthew Ahrens DMU_OBJECT_IS_SPECIAL(dn->dn_object) || 101214843421SMatthew Ahrens dn->dn_objset->os_dsl_dataset == NULL); 1013fa9e4066Sahrens /* 1014fa9e4066Sahrens * We make this assert for private objects as well, but after we 1015fa9e4066Sahrens * check if we're already dirty. They are allowed to re-dirty 1016fa9e4066Sahrens * in syncing context. 1017fa9e4066Sahrens */ 1018ea8dc4b6Seschrock ASSERT(dn->dn_object == DMU_META_DNODE_OBJECT || 1019c717a561Smaybee dn->dn_dirtyctx == DN_UNDIRTIED || dn->dn_dirtyctx == 1020fa9e4066Sahrens (dmu_tx_is_syncing(tx) ? DN_DIRTY_SYNC : DN_DIRTY_OPEN)); 1021fa9e4066Sahrens 1022fa9e4066Sahrens mutex_enter(&db->db_mtx); 1023fa9e4066Sahrens /* 1024c717a561Smaybee * XXX make this true for indirects too? The problem is that 1025c717a561Smaybee * transactions created with dmu_tx_create_assigned() from 1026c717a561Smaybee * syncing context don't bother holding ahead. 1027fa9e4066Sahrens */ 1028c717a561Smaybee ASSERT(db->db_level != 0 || 102982c9918fSTim Haley db->db_state == DB_CACHED || db->db_state == DB_FILL || 103082c9918fSTim Haley db->db_state == DB_NOFILL); 1031fa9e4066Sahrens 1032fa9e4066Sahrens mutex_enter(&dn->dn_mtx); 1033fa9e4066Sahrens /* 1034fa9e4066Sahrens * Don't set dirtyctx to SYNC if we're just modifying this as we 1035fa9e4066Sahrens * initialize the objset. 1036fa9e4066Sahrens */ 1037fa9e4066Sahrens if (dn->dn_dirtyctx == DN_UNDIRTIED && 1038c717a561Smaybee !BP_IS_HOLE(dn->dn_objset->os_rootbp)) { 1039fa9e4066Sahrens dn->dn_dirtyctx = 1040fa9e4066Sahrens (dmu_tx_is_syncing(tx) ? DN_DIRTY_SYNC : DN_DIRTY_OPEN); 1041fa9e4066Sahrens ASSERT(dn->dn_dirtyctx_firstset == NULL); 1042fa9e4066Sahrens dn->dn_dirtyctx_firstset = kmem_alloc(1, KM_SLEEP); 1043fa9e4066Sahrens } 1044fa9e4066Sahrens mutex_exit(&dn->dn_mtx); 1045fa9e4066Sahrens 10460a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) 10470a586ceaSMark Shellenbaum dn->dn_have_spill = B_TRUE; 10480a586ceaSMark Shellenbaum 1049fa9e4066Sahrens /* 1050fa9e4066Sahrens * If this buffer is already dirty, we're done. 1051fa9e4066Sahrens */ 1052c717a561Smaybee drp = &db->db_last_dirty; 1053c717a561Smaybee ASSERT(*drp == NULL || (*drp)->dr_txg <= tx->tx_txg || 1054c717a561Smaybee db->db.db_object == DMU_META_DNODE_OBJECT); 10557e2186e3Sbonwick while ((dr = *drp) != NULL && dr->dr_txg > tx->tx_txg) 10567e2186e3Sbonwick drp = &dr->dr_next; 10577e2186e3Sbonwick if (dr && dr->dr_txg == tx->tx_txg) { 1058744947dcSTom Erickson DB_DNODE_EXIT(db); 1059744947dcSTom Erickson 10600a586ceaSMark Shellenbaum if (db->db_level == 0 && db->db_blkid != DMU_BONUS_BLKID) { 1061c717a561Smaybee /* 1062c717a561Smaybee * If this buffer has already been written out, 1063c717a561Smaybee * we now need to reset its state. 1064c717a561Smaybee */ 10657e2186e3Sbonwick dbuf_unoverride(dr); 1066b24ab676SJeff Bonwick if (db->db.db_object != DMU_META_DNODE_OBJECT && 1067b24ab676SJeff Bonwick db->db_state != DB_NOFILL) 1068c717a561Smaybee arc_buf_thaw(db->db_buf); 1069c717a561Smaybee } 1070fa9e4066Sahrens mutex_exit(&db->db_mtx); 10717e2186e3Sbonwick return (dr); 1072fa9e4066Sahrens } 1073fa9e4066Sahrens 1074fa9e4066Sahrens /* 1075fa9e4066Sahrens * Only valid if not already dirty. 1076fa9e4066Sahrens */ 107714843421SMatthew Ahrens ASSERT(dn->dn_object == 0 || 107814843421SMatthew Ahrens dn->dn_dirtyctx == DN_UNDIRTIED || dn->dn_dirtyctx == 1079fa9e4066Sahrens (dmu_tx_is_syncing(tx) ? DN_DIRTY_SYNC : DN_DIRTY_OPEN)); 1080fa9e4066Sahrens 1081fa9e4066Sahrens ASSERT3U(dn->dn_nlevels, >, db->db_level); 1082fa9e4066Sahrens ASSERT((dn->dn_phys->dn_nlevels == 0 && db->db_level == 0) || 1083fa9e4066Sahrens dn->dn_phys->dn_nlevels > db->db_level || 1084fa9e4066Sahrens dn->dn_next_nlevels[txgoff] > db->db_level || 1085fa9e4066Sahrens dn->dn_next_nlevels[(tx->tx_txg-1) & TXG_MASK] > db->db_level || 1086fa9e4066Sahrens dn->dn_next_nlevels[(tx->tx_txg-2) & TXG_MASK] > db->db_level); 1087fa9e4066Sahrens 1088fa9e4066Sahrens /* 1089fa9e4066Sahrens * We should only be dirtying in syncing context if it's the 109014843421SMatthew Ahrens * mos or we're initializing the os or it's a special object. 109114843421SMatthew Ahrens * However, we are allowed to dirty in syncing context provided 109214843421SMatthew Ahrens * we already dirtied it in open context. Hence we must make 109314843421SMatthew Ahrens * this assertion only if we're not already dirty. 1094fa9e4066Sahrens */ 1095744947dcSTom Erickson os = dn->dn_objset; 109614843421SMatthew Ahrens ASSERT(!dmu_tx_is_syncing(tx) || DMU_OBJECT_IS_SPECIAL(dn->dn_object) || 109714843421SMatthew Ahrens os->os_dsl_dataset == NULL || BP_IS_HOLE(os->os_rootbp)); 1098fa9e4066Sahrens ASSERT(db->db.db_size != 0); 1099fa9e4066Sahrens 1100fa9e4066Sahrens dprintf_dbuf(db, "size=%llx\n", (u_longlong_t)db->db.db_size); 1101fa9e4066Sahrens 11020a586ceaSMark Shellenbaum if (db->db_blkid != DMU_BONUS_BLKID) { 11031934e92fSmaybee /* 11041934e92fSmaybee * Update the accounting. 1105d3469faaSMark Maybee * Note: we delay "free accounting" until after we drop 1106d3469faaSMark Maybee * the db_mtx. This keeps us from grabbing other locks 1107b24ab676SJeff Bonwick * (and possibly deadlocking) in bp_get_dsize() while 1108d3469faaSMark Maybee * also holding the db_mtx. 11091934e92fSmaybee */ 11101934e92fSmaybee dnode_willuse_space(dn, db->db.db_size, tx); 1111d3469faaSMark Maybee do_free_accounting = dbuf_block_freeable(db); 11121934e92fSmaybee } 11131934e92fSmaybee 1114ea8dc4b6Seschrock /* 1115ea8dc4b6Seschrock * If this buffer is dirty in an old transaction group we need 1116ea8dc4b6Seschrock * to make a copy of it so that the changes we make in this 1117ea8dc4b6Seschrock * transaction group won't leak out when we sync the older txg. 1118ea8dc4b6Seschrock */ 1119c717a561Smaybee dr = kmem_zalloc(sizeof (dbuf_dirty_record_t), KM_SLEEP); 1120c717a561Smaybee if (db->db_level == 0) { 1121c717a561Smaybee void *data_old = db->db_buf; 1122c717a561Smaybee 112382c9918fSTim Haley if (db->db_state != DB_NOFILL) { 11240a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 112582c9918fSTim Haley dbuf_fix_old_data(db, tx->tx_txg); 112682c9918fSTim Haley data_old = db->db.db_data; 112782c9918fSTim Haley } else if (db->db.db_object != DMU_META_DNODE_OBJECT) { 112882c9918fSTim Haley /* 112982c9918fSTim Haley * Release the data buffer from the cache so 113082c9918fSTim Haley * that we can modify it without impacting 113182c9918fSTim Haley * possible other users of this cached data 113282c9918fSTim Haley * block. Note that indirect blocks and 113382c9918fSTim Haley * private objects are not released until the 113482c9918fSTim Haley * syncing state (since they are only modified 113582c9918fSTim Haley * then). 113682c9918fSTim Haley */ 113782c9918fSTim Haley arc_release(db->db_buf, db); 113882c9918fSTim Haley dbuf_fix_old_data(db, tx->tx_txg); 113982c9918fSTim Haley data_old = db->db_buf; 114082c9918fSTim Haley } 114182c9918fSTim Haley ASSERT(data_old != NULL); 1142fa9e4066Sahrens } 1143c717a561Smaybee dr->dt.dl.dr_data = data_old; 1144c717a561Smaybee } else { 1145c717a561Smaybee mutex_init(&dr->dt.di.dr_mtx, NULL, MUTEX_DEFAULT, NULL); 1146c717a561Smaybee list_create(&dr->dt.di.dr_children, 1147c717a561Smaybee sizeof (dbuf_dirty_record_t), 1148c717a561Smaybee offsetof(dbuf_dirty_record_t, dr_dirty_node)); 1149fa9e4066Sahrens } 1150c717a561Smaybee dr->dr_dbuf = db; 1151c717a561Smaybee dr->dr_txg = tx->tx_txg; 1152c717a561Smaybee dr->dr_next = *drp; 1153c717a561Smaybee *drp = dr; 1154fa9e4066Sahrens 1155fa9e4066Sahrens /* 1156fa9e4066Sahrens * We could have been freed_in_flight between the dbuf_noread 1157fa9e4066Sahrens * and dbuf_dirty. We win, as though the dbuf_noread() had 1158fa9e4066Sahrens * happened after the free. 1159fa9e4066Sahrens */ 11600a586ceaSMark Shellenbaum if (db->db_level == 0 && db->db_blkid != DMU_BONUS_BLKID && 11610a586ceaSMark Shellenbaum db->db_blkid != DMU_SPILL_BLKID) { 1162c717a561Smaybee mutex_enter(&dn->dn_mtx); 1163fa9e4066Sahrens dnode_clear_range(dn, db->db_blkid, 1, tx); 1164c717a561Smaybee mutex_exit(&dn->dn_mtx); 1165c717a561Smaybee db->db_freed_in_flight = FALSE; 1166fa9e4066Sahrens } 1167fa9e4066Sahrens 1168fa9e4066Sahrens /* 1169fa9e4066Sahrens * This buffer is now part of this txg 1170fa9e4066Sahrens */ 1171fa9e4066Sahrens dbuf_add_ref(db, (void *)(uintptr_t)tx->tx_txg); 1172fa9e4066Sahrens db->db_dirtycnt += 1; 1173fa9e4066Sahrens ASSERT3U(db->db_dirtycnt, <=, 3); 1174fa9e4066Sahrens 1175fa9e4066Sahrens mutex_exit(&db->db_mtx); 1176fa9e4066Sahrens 11770a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID || 11780a586ceaSMark Shellenbaum db->db_blkid == DMU_SPILL_BLKID) { 1179c717a561Smaybee mutex_enter(&dn->dn_mtx); 1180c717a561Smaybee ASSERT(!list_link_active(&dr->dr_dirty_node)); 1181c717a561Smaybee list_insert_tail(&dn->dn_dirty_records[txgoff], dr); 1182c717a561Smaybee mutex_exit(&dn->dn_mtx); 1183fa9e4066Sahrens dnode_setdirty(dn, tx); 1184744947dcSTom Erickson DB_DNODE_EXIT(db); 1185c717a561Smaybee return (dr); 1186d3469faaSMark Maybee } else if (do_free_accounting) { 1187d3469faaSMark Maybee blkptr_t *bp = db->db_blkptr; 1188d3469faaSMark Maybee int64_t willfree = (bp && !BP_IS_HOLE(bp)) ? 1189b24ab676SJeff Bonwick bp_get_dsize(os->os_spa, bp) : db->db.db_size; 1190d3469faaSMark Maybee /* 1191d3469faaSMark Maybee * This is only a guess -- if the dbuf is dirty 1192d3469faaSMark Maybee * in a previous txg, we don't know how much 1193d3469faaSMark Maybee * space it will use on disk yet. We should 1194d3469faaSMark Maybee * really have the struct_rwlock to access 1195d3469faaSMark Maybee * db_blkptr, but since this is just a guess, 1196d3469faaSMark Maybee * it's OK if we get an odd answer. 1197d3469faaSMark Maybee */ 1198837b568bSGeorge Wilson ddt_prefetch(os->os_spa, bp); 1199d3469faaSMark Maybee dnode_willuse_space(dn, -willfree, tx); 1200fa9e4066Sahrens } 1201fa9e4066Sahrens 1202fa9e4066Sahrens if (!RW_WRITE_HELD(&dn->dn_struct_rwlock)) { 1203fa9e4066Sahrens rw_enter(&dn->dn_struct_rwlock, RW_READER); 1204fa9e4066Sahrens drop_struct_lock = TRUE; 1205fa9e4066Sahrens } 1206fa9e4066Sahrens 12078346f03fSJonathan W Adams if (db->db_level == 0) { 12088346f03fSJonathan W Adams dnode_new_blkid(dn, db->db_blkid, tx, drop_struct_lock); 12098346f03fSJonathan W Adams ASSERT(dn->dn_maxblkid >= db->db_blkid); 12108346f03fSJonathan W Adams } 12118346f03fSJonathan W Adams 121244eda4d7Smaybee if (db->db_level+1 < dn->dn_nlevels) { 1213c717a561Smaybee dmu_buf_impl_t *parent = db->db_parent; 1214c717a561Smaybee dbuf_dirty_record_t *di; 1215c717a561Smaybee int parent_held = FALSE; 1216c717a561Smaybee 1217c717a561Smaybee if (db->db_parent == NULL || db->db_parent == dn->dn_dbuf) { 1218c717a561Smaybee int epbs = dn->dn_indblkshift - SPA_BLKPTRSHIFT; 1219c717a561Smaybee 1220c717a561Smaybee parent = dbuf_hold_level(dn, db->db_level+1, 1221c717a561Smaybee db->db_blkid >> epbs, FTAG); 122201025c89SJohn Harres ASSERT(parent != NULL); 1223c717a561Smaybee parent_held = TRUE; 1224c717a561Smaybee } 1225fa9e4066Sahrens if (drop_struct_lock) 1226fa9e4066Sahrens rw_exit(&dn->dn_struct_rwlock); 1227c717a561Smaybee ASSERT3U(db->db_level+1, ==, parent->db_level); 1228c717a561Smaybee di = dbuf_dirty(parent, tx); 1229c717a561Smaybee if (parent_held) 1230c717a561Smaybee dbuf_rele(parent, FTAG); 1231c717a561Smaybee 1232c717a561Smaybee mutex_enter(&db->db_mtx); 1233c717a561Smaybee /* possible race with dbuf_undirty() */ 1234c717a561Smaybee if (db->db_last_dirty == dr || 1235c717a561Smaybee dn->dn_object == DMU_META_DNODE_OBJECT) { 1236c717a561Smaybee mutex_enter(&di->dt.di.dr_mtx); 1237c717a561Smaybee ASSERT3U(di->dr_txg, ==, tx->tx_txg); 1238c717a561Smaybee ASSERT(!list_link_active(&dr->dr_dirty_node)); 1239c717a561Smaybee list_insert_tail(&di->dt.di.dr_children, dr); 1240c717a561Smaybee mutex_exit(&di->dt.di.dr_mtx); 1241c717a561Smaybee dr->dr_parent = di; 1242c717a561Smaybee } 1243c717a561Smaybee mutex_exit(&db->db_mtx); 1244fa9e4066Sahrens } else { 1245c717a561Smaybee ASSERT(db->db_level+1 == dn->dn_nlevels); 1246c717a561Smaybee ASSERT(db->db_blkid < dn->dn_nblkptr); 1247744947dcSTom Erickson ASSERT(db->db_parent == NULL || db->db_parent == dn->dn_dbuf); 1248c717a561Smaybee mutex_enter(&dn->dn_mtx); 1249c717a561Smaybee ASSERT(!list_link_active(&dr->dr_dirty_node)); 1250c717a561Smaybee list_insert_tail(&dn->dn_dirty_records[txgoff], dr); 1251c717a561Smaybee mutex_exit(&dn->dn_mtx); 1252fa9e4066Sahrens if (drop_struct_lock) 1253fa9e4066Sahrens rw_exit(&dn->dn_struct_rwlock); 1254fa9e4066Sahrens } 1255fa9e4066Sahrens 1256fa9e4066Sahrens dnode_setdirty(dn, tx); 1257744947dcSTom Erickson DB_DNODE_EXIT(db); 1258c717a561Smaybee return (dr); 1259fa9e4066Sahrens } 1260fa9e4066Sahrens 1261fa9e4066Sahrens static int 1262fa9e4066Sahrens dbuf_undirty(dmu_buf_impl_t *db, dmu_tx_t *tx) 1263fa9e4066Sahrens { 1264744947dcSTom Erickson dnode_t *dn; 1265c717a561Smaybee uint64_t txg = tx->tx_txg; 126617f17c2dSbonwick dbuf_dirty_record_t *dr, **drp; 1267fa9e4066Sahrens 1268c717a561Smaybee ASSERT(txg != 0); 12690a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 1270fa9e4066Sahrens 1271fa9e4066Sahrens mutex_enter(&db->db_mtx); 1272fa9e4066Sahrens /* 1273fa9e4066Sahrens * If this buffer is not dirty, we're done. 1274fa9e4066Sahrens */ 127517f17c2dSbonwick for (drp = &db->db_last_dirty; (dr = *drp) != NULL; drp = &dr->dr_next) 1276c717a561Smaybee if (dr->dr_txg <= txg) 1277c717a561Smaybee break; 1278c717a561Smaybee if (dr == NULL || dr->dr_txg < txg) { 1279fa9e4066Sahrens mutex_exit(&db->db_mtx); 1280fa9e4066Sahrens return (0); 1281fa9e4066Sahrens } 1282c717a561Smaybee ASSERT(dr->dr_txg == txg); 1283b24ab676SJeff Bonwick ASSERT(dr->dr_dbuf == db); 1284fa9e4066Sahrens 1285744947dcSTom Erickson DB_DNODE_ENTER(db); 1286744947dcSTom Erickson dn = DB_DNODE(db); 1287744947dcSTom Erickson 1288fa9e4066Sahrens /* 1289fa9e4066Sahrens * If this buffer is currently held, we cannot undirty 1290fa9e4066Sahrens * it, since one of the current holders may be in the 1291fa9e4066Sahrens * middle of an update. Note that users of dbuf_undirty() 1292fa9e4066Sahrens * should not place a hold on the dbuf before the call. 12933f2366c2SGordon Ross * Also note: we can get here with a spill block, so 12943f2366c2SGordon Ross * test for that similar to how dbuf_dirty does. 1295fa9e4066Sahrens */ 1296fa9e4066Sahrens if (refcount_count(&db->db_holds) > db->db_dirtycnt) { 1297fa9e4066Sahrens mutex_exit(&db->db_mtx); 129844eda4d7Smaybee /* Make sure we don't toss this buffer at sync phase */ 12993f2366c2SGordon Ross if (db->db_blkid != DMU_SPILL_BLKID) { 13003f2366c2SGordon Ross mutex_enter(&dn->dn_mtx); 13013f2366c2SGordon Ross dnode_clear_range(dn, db->db_blkid, 1, tx); 13023f2366c2SGordon Ross mutex_exit(&dn->dn_mtx); 13033f2366c2SGordon Ross } 1304744947dcSTom Erickson DB_DNODE_EXIT(db); 1305fa9e4066Sahrens return (0); 1306fa9e4066Sahrens } 1307fa9e4066Sahrens 1308fa9e4066Sahrens dprintf_dbuf(db, "size=%llx\n", (u_longlong_t)db->db.db_size); 1309fa9e4066Sahrens 1310fa9e4066Sahrens ASSERT(db->db.db_size != 0); 1311fa9e4066Sahrens 1312fa9e4066Sahrens /* XXX would be nice to fix up dn_towrite_space[] */ 1313fa9e4066Sahrens 131417f17c2dSbonwick *drp = dr->dr_next; 1315c717a561Smaybee 13163f2366c2SGordon Ross /* 13173f2366c2SGordon Ross * Note that there are three places in dbuf_dirty() 13183f2366c2SGordon Ross * where this dirty record may be put on a list. 13193f2366c2SGordon Ross * Make sure to do a list_remove corresponding to 13203f2366c2SGordon Ross * every one of those list_insert calls. 13213f2366c2SGordon Ross */ 1322c717a561Smaybee if (dr->dr_parent) { 1323c717a561Smaybee mutex_enter(&dr->dr_parent->dt.di.dr_mtx); 1324c717a561Smaybee list_remove(&dr->dr_parent->dt.di.dr_children, dr); 1325c717a561Smaybee mutex_exit(&dr->dr_parent->dt.di.dr_mtx); 13263f2366c2SGordon Ross } else if (db->db_blkid == DMU_SPILL_BLKID || 13273f2366c2SGordon Ross db->db_level+1 == dn->dn_nlevels) { 1328cdb0ab79Smaybee ASSERT(db->db_blkptr == NULL || db->db_parent == dn->dn_dbuf); 1329c717a561Smaybee mutex_enter(&dn->dn_mtx); 1330c717a561Smaybee list_remove(&dn->dn_dirty_records[txg & TXG_MASK], dr); 1331c717a561Smaybee mutex_exit(&dn->dn_mtx); 1332c717a561Smaybee } 1333744947dcSTom Erickson DB_DNODE_EXIT(db); 1334c717a561Smaybee 1335c717a561Smaybee if (db->db_level == 0) { 133682c9918fSTim Haley if (db->db_state != DB_NOFILL) { 133782c9918fSTim Haley dbuf_unoverride(dr); 1338c717a561Smaybee 133982c9918fSTim Haley ASSERT(db->db_buf != NULL); 134082c9918fSTim Haley ASSERT(dr->dt.dl.dr_data != NULL); 134182c9918fSTim Haley if (dr->dt.dl.dr_data != db->db_buf) 134282c9918fSTim Haley VERIFY(arc_buf_remove_ref(dr->dt.dl.dr_data, 134382c9918fSTim Haley db) == 1); 134482c9918fSTim Haley } 1345c717a561Smaybee } else { 1346c717a561Smaybee ASSERT(db->db_buf != NULL); 1347c717a561Smaybee ASSERT(list_head(&dr->dt.di.dr_children) == NULL); 1348c25056deSgw mutex_destroy(&dr->dt.di.dr_mtx); 1349c25056deSgw list_destroy(&dr->dt.di.dr_children); 1350c717a561Smaybee } 1351c717a561Smaybee kmem_free(dr, sizeof (dbuf_dirty_record_t)); 1352fa9e4066Sahrens 1353fa9e4066Sahrens ASSERT(db->db_dirtycnt > 0); 1354fa9e4066Sahrens db->db_dirtycnt -= 1; 1355fa9e4066Sahrens 1356c717a561Smaybee if (refcount_remove(&db->db_holds, (void *)(uintptr_t)txg) == 0) { 1357ea8dc4b6Seschrock arc_buf_t *buf = db->db_buf; 1358fa9e4066Sahrens 1359b24ab676SJeff Bonwick ASSERT(db->db_state == DB_NOFILL || arc_released(buf)); 1360ea8dc4b6Seschrock dbuf_set_data(db, NULL); 1361ea8dc4b6Seschrock VERIFY(arc_buf_remove_ref(buf, db) == 1); 1362fa9e4066Sahrens dbuf_evict(db); 1363fa9e4066Sahrens return (1); 1364fa9e4066Sahrens } 1365fa9e4066Sahrens 1366fa9e4066Sahrens mutex_exit(&db->db_mtx); 1367fa9e4066Sahrens return (0); 1368fa9e4066Sahrens } 1369fa9e4066Sahrens 1370fa9e4066Sahrens #pragma weak dmu_buf_will_dirty = dbuf_will_dirty 1371fa9e4066Sahrens void 1372fa9e4066Sahrens dbuf_will_dirty(dmu_buf_impl_t *db, dmu_tx_t *tx) 1373fa9e4066Sahrens { 13741ab7f2deSmaybee int rf = DB_RF_MUST_SUCCEED | DB_RF_NOPREFETCH; 1375fa9e4066Sahrens 1376fa9e4066Sahrens ASSERT(tx->tx_txg != 0); 1377fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 1378fa9e4066Sahrens 1379744947dcSTom Erickson DB_DNODE_ENTER(db); 1380744947dcSTom Erickson if (RW_WRITE_HELD(&DB_DNODE(db)->dn_struct_rwlock)) 1381fa9e4066Sahrens rf |= DB_RF_HAVESTRUCT; 1382744947dcSTom Erickson DB_DNODE_EXIT(db); 1383ea8dc4b6Seschrock (void) dbuf_read(db, NULL, rf); 1384c717a561Smaybee (void) dbuf_dirty(db, tx); 1385fa9e4066Sahrens } 1386fa9e4066Sahrens 138782c9918fSTim Haley void 138882c9918fSTim Haley dmu_buf_will_not_fill(dmu_buf_t *db_fake, dmu_tx_t *tx) 138982c9918fSTim Haley { 139082c9918fSTim Haley dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 139182c9918fSTim Haley 139282c9918fSTim Haley db->db_state = DB_NOFILL; 139382c9918fSTim Haley 139482c9918fSTim Haley dmu_buf_will_fill(db_fake, tx); 139582c9918fSTim Haley } 139682c9918fSTim Haley 1397fa9e4066Sahrens void 1398ea8dc4b6Seschrock dmu_buf_will_fill(dmu_buf_t *db_fake, dmu_tx_t *tx) 1399fa9e4066Sahrens { 1400ea8dc4b6Seschrock dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 1401ea8dc4b6Seschrock 14020a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 1403fa9e4066Sahrens ASSERT(tx->tx_txg != 0); 1404fa9e4066Sahrens ASSERT(db->db_level == 0); 1405fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 1406fa9e4066Sahrens 1407ea8dc4b6Seschrock ASSERT(db->db.db_object != DMU_META_DNODE_OBJECT || 1408fa9e4066Sahrens dmu_tx_private_ok(tx)); 1409fa9e4066Sahrens 1410fa9e4066Sahrens dbuf_noread(db); 1411c717a561Smaybee (void) dbuf_dirty(db, tx); 1412fa9e4066Sahrens } 1413fa9e4066Sahrens 1414fa9e4066Sahrens #pragma weak dmu_buf_fill_done = dbuf_fill_done 1415fa9e4066Sahrens /* ARGSUSED */ 1416fa9e4066Sahrens void 1417fa9e4066Sahrens dbuf_fill_done(dmu_buf_impl_t *db, dmu_tx_t *tx) 1418fa9e4066Sahrens { 1419fa9e4066Sahrens mutex_enter(&db->db_mtx); 14209c9dc39aSek DBUF_VERIFY(db); 1421fa9e4066Sahrens 1422fa9e4066Sahrens if (db->db_state == DB_FILL) { 1423c717a561Smaybee if (db->db_level == 0 && db->db_freed_in_flight) { 14240a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 1425fa9e4066Sahrens /* we were freed while filling */ 1426fa9e4066Sahrens /* XXX dbuf_undirty? */ 1427fa9e4066Sahrens bzero(db->db.db_data, db->db.db_size); 1428c717a561Smaybee db->db_freed_in_flight = FALSE; 1429fa9e4066Sahrens } 1430fa9e4066Sahrens db->db_state = DB_CACHED; 1431fa9e4066Sahrens cv_broadcast(&db->db_changed); 1432fa9e4066Sahrens } 1433fa9e4066Sahrens mutex_exit(&db->db_mtx); 1434fa9e4066Sahrens } 1435fa9e4066Sahrens 14362fdbea25SAleksandr Guzovskiy /* 14372fdbea25SAleksandr Guzovskiy * Directly assign a provided arc buf to a given dbuf if it's not referenced 14382fdbea25SAleksandr Guzovskiy * by anybody except our caller. Otherwise copy arcbuf's contents to dbuf. 14392fdbea25SAleksandr Guzovskiy */ 14402fdbea25SAleksandr Guzovskiy void 14412fdbea25SAleksandr Guzovskiy dbuf_assign_arcbuf(dmu_buf_impl_t *db, arc_buf_t *buf, dmu_tx_t *tx) 14422fdbea25SAleksandr Guzovskiy { 14432fdbea25SAleksandr Guzovskiy ASSERT(!refcount_is_zero(&db->db_holds)); 14440a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 14452fdbea25SAleksandr Guzovskiy ASSERT(db->db_level == 0); 14462fdbea25SAleksandr Guzovskiy ASSERT(DBUF_GET_BUFC_TYPE(db) == ARC_BUFC_DATA); 14472fdbea25SAleksandr Guzovskiy ASSERT(buf != NULL); 14482fdbea25SAleksandr Guzovskiy ASSERT(arc_buf_size(buf) == db->db.db_size); 14492fdbea25SAleksandr Guzovskiy ASSERT(tx->tx_txg != 0); 14502fdbea25SAleksandr Guzovskiy 14512fdbea25SAleksandr Guzovskiy arc_return_buf(buf, db); 14522fdbea25SAleksandr Guzovskiy ASSERT(arc_released(buf)); 14532fdbea25SAleksandr Guzovskiy 14542fdbea25SAleksandr Guzovskiy mutex_enter(&db->db_mtx); 14552fdbea25SAleksandr Guzovskiy 14562fdbea25SAleksandr Guzovskiy while (db->db_state == DB_READ || db->db_state == DB_FILL) 14572fdbea25SAleksandr Guzovskiy cv_wait(&db->db_changed, &db->db_mtx); 14582fdbea25SAleksandr Guzovskiy 14592fdbea25SAleksandr Guzovskiy ASSERT(db->db_state == DB_CACHED || db->db_state == DB_UNCACHED); 14602fdbea25SAleksandr Guzovskiy 14612fdbea25SAleksandr Guzovskiy if (db->db_state == DB_CACHED && 14622fdbea25SAleksandr Guzovskiy refcount_count(&db->db_holds) - 1 > db->db_dirtycnt) { 14632fdbea25SAleksandr Guzovskiy mutex_exit(&db->db_mtx); 14642fdbea25SAleksandr Guzovskiy (void) dbuf_dirty(db, tx); 14652fdbea25SAleksandr Guzovskiy bcopy(buf->b_data, db->db.db_data, db->db.db_size); 14662fdbea25SAleksandr Guzovskiy VERIFY(arc_buf_remove_ref(buf, db) == 1); 1467c242f9a0Schunli zhang - Sun Microsystems - Irvine United States xuio_stat_wbuf_copied(); 14682fdbea25SAleksandr Guzovskiy return; 14692fdbea25SAleksandr Guzovskiy } 14702fdbea25SAleksandr Guzovskiy 1471c242f9a0Schunli zhang - Sun Microsystems - Irvine United States xuio_stat_wbuf_nocopy(); 14722fdbea25SAleksandr Guzovskiy if (db->db_state == DB_CACHED) { 14732fdbea25SAleksandr Guzovskiy dbuf_dirty_record_t *dr = db->db_last_dirty; 14742fdbea25SAleksandr Guzovskiy 14752fdbea25SAleksandr Guzovskiy ASSERT(db->db_buf != NULL); 14762fdbea25SAleksandr Guzovskiy if (dr != NULL && dr->dr_txg == tx->tx_txg) { 14772fdbea25SAleksandr Guzovskiy ASSERT(dr->dt.dl.dr_data == db->db_buf); 14782fdbea25SAleksandr Guzovskiy if (!arc_released(db->db_buf)) { 14792fdbea25SAleksandr Guzovskiy ASSERT(dr->dt.dl.dr_override_state == 14802fdbea25SAleksandr Guzovskiy DR_OVERRIDDEN); 14812fdbea25SAleksandr Guzovskiy arc_release(db->db_buf, db); 14822fdbea25SAleksandr Guzovskiy } 14832fdbea25SAleksandr Guzovskiy dr->dt.dl.dr_data = buf; 14842fdbea25SAleksandr Guzovskiy VERIFY(arc_buf_remove_ref(db->db_buf, db) == 1); 14852fdbea25SAleksandr Guzovskiy } else if (dr == NULL || dr->dt.dl.dr_data != db->db_buf) { 14862fdbea25SAleksandr Guzovskiy arc_release(db->db_buf, db); 14872fdbea25SAleksandr Guzovskiy VERIFY(arc_buf_remove_ref(db->db_buf, db) == 1); 14882fdbea25SAleksandr Guzovskiy } 14892fdbea25SAleksandr Guzovskiy db->db_buf = NULL; 14902fdbea25SAleksandr Guzovskiy } 14912fdbea25SAleksandr Guzovskiy ASSERT(db->db_buf == NULL); 14922fdbea25SAleksandr Guzovskiy dbuf_set_data(db, buf); 14932fdbea25SAleksandr Guzovskiy db->db_state = DB_FILL; 14942fdbea25SAleksandr Guzovskiy mutex_exit(&db->db_mtx); 14952fdbea25SAleksandr Guzovskiy (void) dbuf_dirty(db, tx); 14962fdbea25SAleksandr Guzovskiy dbuf_fill_done(db, tx); 14972fdbea25SAleksandr Guzovskiy } 14982fdbea25SAleksandr Guzovskiy 1499ea8dc4b6Seschrock /* 1500ea8dc4b6Seschrock * "Clear" the contents of this dbuf. This will mark the dbuf 1501ea8dc4b6Seschrock * EVICTING and clear *most* of its references. Unfortunetely, 1502ea8dc4b6Seschrock * when we are not holding the dn_dbufs_mtx, we can't clear the 1503ea8dc4b6Seschrock * entry in the dn_dbufs list. We have to wait until dbuf_destroy() 1504ea8dc4b6Seschrock * in this case. For callers from the DMU we will usually see: 1505ea8dc4b6Seschrock * dbuf_clear()->arc_buf_evict()->dbuf_do_evict()->dbuf_destroy() 1506ea8dc4b6Seschrock * For the arc callback, we will usually see: 1507744947dcSTom Erickson * dbuf_do_evict()->dbuf_clear();dbuf_destroy() 1508ea8dc4b6Seschrock * Sometimes, though, we will get a mix of these two: 1509ea8dc4b6Seschrock * DMU: dbuf_clear()->arc_buf_evict() 1510ea8dc4b6Seschrock * ARC: dbuf_do_evict()->dbuf_destroy() 1511ea8dc4b6Seschrock */ 1512ea8dc4b6Seschrock void 1513fa9e4066Sahrens dbuf_clear(dmu_buf_impl_t *db) 1514fa9e4066Sahrens { 1515744947dcSTom Erickson dnode_t *dn; 1516ea8dc4b6Seschrock dmu_buf_impl_t *parent = db->db_parent; 1517744947dcSTom Erickson dmu_buf_impl_t *dndb; 1518ea8dc4b6Seschrock int dbuf_gone = FALSE; 1519fa9e4066Sahrens 1520fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 1521fa9e4066Sahrens ASSERT(refcount_is_zero(&db->db_holds)); 1522fa9e4066Sahrens 1523ea8dc4b6Seschrock dbuf_evict_user(db); 1524ea8dc4b6Seschrock 1525fa9e4066Sahrens if (db->db_state == DB_CACHED) { 1526ea8dc4b6Seschrock ASSERT(db->db.db_data != NULL); 15270a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 1528ea8dc4b6Seschrock zio_buf_free(db->db.db_data, DN_MAX_BONUSLEN); 15295a98e54bSBrendan Gregg - Sun Microsystems arc_space_return(DN_MAX_BONUSLEN, ARC_SPACE_OTHER); 15300e8c6158Smaybee } 1531fa9e4066Sahrens db->db.db_data = NULL; 1532fa9e4066Sahrens db->db_state = DB_UNCACHED; 1533fa9e4066Sahrens } 1534fa9e4066Sahrens 153582c9918fSTim Haley ASSERT(db->db_state == DB_UNCACHED || db->db_state == DB_NOFILL); 1536fa9e4066Sahrens ASSERT(db->db_data_pending == NULL); 1537fa9e4066Sahrens 1538ea8dc4b6Seschrock db->db_state = DB_EVICTING; 1539ea8dc4b6Seschrock db->db_blkptr = NULL; 1540ea8dc4b6Seschrock 1541744947dcSTom Erickson DB_DNODE_ENTER(db); 1542744947dcSTom Erickson dn = DB_DNODE(db); 1543744947dcSTom Erickson dndb = dn->dn_dbuf; 15440a586ceaSMark Shellenbaum if (db->db_blkid != DMU_BONUS_BLKID && MUTEX_HELD(&dn->dn_dbufs_mtx)) { 1545ea8dc4b6Seschrock list_remove(&dn->dn_dbufs, db); 1546744947dcSTom Erickson (void) atomic_dec_32_nv(&dn->dn_dbufs_count); 1547744947dcSTom Erickson membar_producer(); 1548744947dcSTom Erickson DB_DNODE_EXIT(db); 1549744947dcSTom Erickson /* 1550744947dcSTom Erickson * Decrementing the dbuf count means that the hold corresponding 1551744947dcSTom Erickson * to the removed dbuf is no longer discounted in dnode_move(), 1552744947dcSTom Erickson * so the dnode cannot be moved until after we release the hold. 1553744947dcSTom Erickson * The membar_producer() ensures visibility of the decremented 1554744947dcSTom Erickson * value in dnode_move(), since DB_DNODE_EXIT doesn't actually 1555744947dcSTom Erickson * release any lock. 1556744947dcSTom Erickson */ 1557ea8dc4b6Seschrock dnode_rele(dn, db); 1558744947dcSTom Erickson db->db_dnode_handle = NULL; 1559744947dcSTom Erickson } else { 1560744947dcSTom Erickson DB_DNODE_EXIT(db); 1561ea8dc4b6Seschrock } 1562ea8dc4b6Seschrock 1563ea8dc4b6Seschrock if (db->db_buf) 1564ea8dc4b6Seschrock dbuf_gone = arc_buf_evict(db->db_buf); 1565ea8dc4b6Seschrock 1566ea8dc4b6Seschrock if (!dbuf_gone) 1567ea8dc4b6Seschrock mutex_exit(&db->db_mtx); 1568fa9e4066Sahrens 1569fa9e4066Sahrens /* 1570744947dcSTom Erickson * If this dbuf is referenced from an indirect dbuf, 1571fa9e4066Sahrens * decrement the ref count on the indirect dbuf. 1572fa9e4066Sahrens */ 1573c543ec06Sahrens if (parent && parent != dndb) 1574ea8dc4b6Seschrock dbuf_rele(parent, db); 1575fa9e4066Sahrens } 1576fa9e4066Sahrens 1577fa9e4066Sahrens static int 1578fa9e4066Sahrens dbuf_findbp(dnode_t *dn, int level, uint64_t blkid, int fail_sparse, 1579fa9e4066Sahrens dmu_buf_impl_t **parentp, blkptr_t **bpp) 1580fa9e4066Sahrens { 1581fa9e4066Sahrens int nlevels, epbs; 1582fa9e4066Sahrens 15830b69c2f0Sahrens *parentp = NULL; 15840b69c2f0Sahrens *bpp = NULL; 15850b69c2f0Sahrens 15860a586ceaSMark Shellenbaum ASSERT(blkid != DMU_BONUS_BLKID); 15870a586ceaSMark Shellenbaum 15880a586ceaSMark Shellenbaum if (blkid == DMU_SPILL_BLKID) { 15890a586ceaSMark Shellenbaum mutex_enter(&dn->dn_mtx); 159006e0070dSMark Shellenbaum if (dn->dn_have_spill && 159106e0070dSMark Shellenbaum (dn->dn_phys->dn_flags & DNODE_FLAG_SPILL_BLKPTR)) 15920a586ceaSMark Shellenbaum *bpp = &dn->dn_phys->dn_spill; 15930a586ceaSMark Shellenbaum else 15940a586ceaSMark Shellenbaum *bpp = NULL; 15950a586ceaSMark Shellenbaum dbuf_add_ref(dn->dn_dbuf, NULL); 15960a586ceaSMark Shellenbaum *parentp = dn->dn_dbuf; 15970a586ceaSMark Shellenbaum mutex_exit(&dn->dn_mtx); 15980a586ceaSMark Shellenbaum return (0); 15990a586ceaSMark Shellenbaum } 1600ea8dc4b6Seschrock 1601fa9e4066Sahrens if (dn->dn_phys->dn_nlevels == 0) 1602fa9e4066Sahrens nlevels = 1; 1603fa9e4066Sahrens else 1604fa9e4066Sahrens nlevels = dn->dn_phys->dn_nlevels; 1605fa9e4066Sahrens 1606fa9e4066Sahrens epbs = dn->dn_indblkshift - SPA_BLKPTRSHIFT; 1607fa9e4066Sahrens 1608fa9e4066Sahrens ASSERT3U(level * epbs, <, 64); 1609fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 1610ea8dc4b6Seschrock if (level >= nlevels || 1611fa9e4066Sahrens (blkid > (dn->dn_phys->dn_maxblkid >> (level * epbs)))) { 1612fa9e4066Sahrens /* the buffer has no parent yet */ 1613fa9e4066Sahrens return (ENOENT); 1614fa9e4066Sahrens } else if (level < nlevels-1) { 1615fa9e4066Sahrens /* this block is referenced from an indirect block */ 1616fa9e4066Sahrens int err = dbuf_hold_impl(dn, level+1, 1617fa9e4066Sahrens blkid >> epbs, fail_sparse, NULL, parentp); 1618fa9e4066Sahrens if (err) 1619fa9e4066Sahrens return (err); 1620ea8dc4b6Seschrock err = dbuf_read(*parentp, NULL, 1621ea8dc4b6Seschrock (DB_RF_HAVESTRUCT | DB_RF_NOPREFETCH | DB_RF_CANFAIL)); 1622c543ec06Sahrens if (err) { 1623c543ec06Sahrens dbuf_rele(*parentp, NULL); 1624c543ec06Sahrens *parentp = NULL; 1625c543ec06Sahrens return (err); 1626ea8dc4b6Seschrock } 1627c543ec06Sahrens *bpp = ((blkptr_t *)(*parentp)->db.db_data) + 1628c543ec06Sahrens (blkid & ((1ULL << epbs) - 1)); 1629c543ec06Sahrens return (0); 1630fa9e4066Sahrens } else { 1631fa9e4066Sahrens /* the block is referenced from the dnode */ 1632fa9e4066Sahrens ASSERT3U(level, ==, nlevels-1); 1633fa9e4066Sahrens ASSERT(dn->dn_phys->dn_nblkptr == 0 || 1634fa9e4066Sahrens blkid < dn->dn_phys->dn_nblkptr); 1635c543ec06Sahrens if (dn->dn_dbuf) { 1636c543ec06Sahrens dbuf_add_ref(dn->dn_dbuf, NULL); 1637c543ec06Sahrens *parentp = dn->dn_dbuf; 1638c543ec06Sahrens } 1639fa9e4066Sahrens *bpp = &dn->dn_phys->dn_blkptr[blkid]; 1640fa9e4066Sahrens return (0); 1641fa9e4066Sahrens } 1642fa9e4066Sahrens } 1643fa9e4066Sahrens 1644fa9e4066Sahrens static dmu_buf_impl_t * 1645fa9e4066Sahrens dbuf_create(dnode_t *dn, uint8_t level, uint64_t blkid, 1646fa9e4066Sahrens dmu_buf_impl_t *parent, blkptr_t *blkptr) 1647fa9e4066Sahrens { 1648503ad85cSMatthew Ahrens objset_t *os = dn->dn_objset; 1649fa9e4066Sahrens dmu_buf_impl_t *db, *odb; 1650fa9e4066Sahrens 1651fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 1652fa9e4066Sahrens ASSERT(dn->dn_type != DMU_OT_NONE); 1653fa9e4066Sahrens 1654fa9e4066Sahrens db = kmem_cache_alloc(dbuf_cache, KM_SLEEP); 1655fa9e4066Sahrens 1656fa9e4066Sahrens db->db_objset = os; 1657fa9e4066Sahrens db->db.db_object = dn->dn_object; 1658fa9e4066Sahrens db->db_level = level; 1659fa9e4066Sahrens db->db_blkid = blkid; 1660c717a561Smaybee db->db_last_dirty = NULL; 1661ea8dc4b6Seschrock db->db_dirtycnt = 0; 1662744947dcSTom Erickson db->db_dnode_handle = dn->dn_handle; 1663ea8dc4b6Seschrock db->db_parent = parent; 1664ea8dc4b6Seschrock db->db_blkptr = blkptr; 1665fa9e4066Sahrens 1666c717a561Smaybee db->db_user_ptr = NULL; 1667c717a561Smaybee db->db_user_data_ptr_ptr = NULL; 1668c717a561Smaybee db->db_evict_func = NULL; 1669c717a561Smaybee db->db_immediate_evict = 0; 1670c717a561Smaybee db->db_freed_in_flight = 0; 1671ea8dc4b6Seschrock 16720a586ceaSMark Shellenbaum if (blkid == DMU_BONUS_BLKID) { 1673ea8dc4b6Seschrock ASSERT3P(parent, ==, dn->dn_dbuf); 16741934e92fSmaybee db->db.db_size = DN_MAX_BONUSLEN - 16751934e92fSmaybee (dn->dn_nblkptr-1) * sizeof (blkptr_t); 16761934e92fSmaybee ASSERT3U(db->db.db_size, >=, dn->dn_bonuslen); 16770a586ceaSMark Shellenbaum db->db.db_offset = DMU_BONUS_BLKID; 1678ea8dc4b6Seschrock db->db_state = DB_UNCACHED; 1679ea8dc4b6Seschrock /* the bonus dbuf is not placed in the hash table */ 16805a98e54bSBrendan Gregg - Sun Microsystems arc_space_consume(sizeof (dmu_buf_impl_t), ARC_SPACE_OTHER); 1681ea8dc4b6Seschrock return (db); 16820a586ceaSMark Shellenbaum } else if (blkid == DMU_SPILL_BLKID) { 16830a586ceaSMark Shellenbaum db->db.db_size = (blkptr != NULL) ? 16840a586ceaSMark Shellenbaum BP_GET_LSIZE(blkptr) : SPA_MINBLOCKSIZE; 16850a586ceaSMark Shellenbaum db->db.db_offset = 0; 1686fa9e4066Sahrens } else { 1687fa9e4066Sahrens int blocksize = 1688fa9e4066Sahrens db->db_level ? 1<<dn->dn_indblkshift : dn->dn_datablksz; 1689fa9e4066Sahrens db->db.db_size = blocksize; 1690fa9e4066Sahrens db->db.db_offset = db->db_blkid * blocksize; 1691fa9e4066Sahrens } 1692fa9e4066Sahrens 1693fa9e4066Sahrens /* 1694fa9e4066Sahrens * Hold the dn_dbufs_mtx while we get the new dbuf 1695fa9e4066Sahrens * in the hash table *and* added to the dbufs list. 1696fa9e4066Sahrens * This prevents a possible deadlock with someone 1697fa9e4066Sahrens * trying to look up this dbuf before its added to the 1698fa9e4066Sahrens * dn_dbufs list. 1699fa9e4066Sahrens */ 1700fa9e4066Sahrens mutex_enter(&dn->dn_dbufs_mtx); 1701ea8dc4b6Seschrock db->db_state = DB_EVICTING; 1702fa9e4066Sahrens if ((odb = dbuf_hash_insert(db)) != NULL) { 1703fa9e4066Sahrens /* someone else inserted it first */ 1704fa9e4066Sahrens kmem_cache_free(dbuf_cache, db); 1705fa9e4066Sahrens mutex_exit(&dn->dn_dbufs_mtx); 1706fa9e4066Sahrens return (odb); 1707fa9e4066Sahrens } 1708fa9e4066Sahrens list_insert_head(&dn->dn_dbufs, db); 1709ea8dc4b6Seschrock db->db_state = DB_UNCACHED; 1710fa9e4066Sahrens mutex_exit(&dn->dn_dbufs_mtx); 17115a98e54bSBrendan Gregg - Sun Microsystems arc_space_consume(sizeof (dmu_buf_impl_t), ARC_SPACE_OTHER); 1712fa9e4066Sahrens 1713fa9e4066Sahrens if (parent && parent != dn->dn_dbuf) 1714fa9e4066Sahrens dbuf_add_ref(parent, db); 1715fa9e4066Sahrens 1716ea8dc4b6Seschrock ASSERT(dn->dn_object == DMU_META_DNODE_OBJECT || 1717ea8dc4b6Seschrock refcount_count(&dn->dn_holds) > 0); 1718fa9e4066Sahrens (void) refcount_add(&dn->dn_holds, db); 1719744947dcSTom Erickson (void) atomic_inc_32_nv(&dn->dn_dbufs_count); 1720fa9e4066Sahrens 1721fa9e4066Sahrens dprintf_dbuf(db, "db=%p\n", db); 1722fa9e4066Sahrens 1723fa9e4066Sahrens return (db); 1724fa9e4066Sahrens } 1725fa9e4066Sahrens 1726fa9e4066Sahrens static int 1727ea8dc4b6Seschrock dbuf_do_evict(void *private) 1728fa9e4066Sahrens { 1729ea8dc4b6Seschrock arc_buf_t *buf = private; 1730ea8dc4b6Seschrock dmu_buf_impl_t *db = buf->b_private; 1731fa9e4066Sahrens 1732ea8dc4b6Seschrock if (!MUTEX_HELD(&db->db_mtx)) 1733ea8dc4b6Seschrock mutex_enter(&db->db_mtx); 1734fa9e4066Sahrens 1735ea8dc4b6Seschrock ASSERT(refcount_is_zero(&db->db_holds)); 1736fa9e4066Sahrens 1737ea8dc4b6Seschrock if (db->db_state != DB_EVICTING) { 1738ea8dc4b6Seschrock ASSERT(db->db_state == DB_CACHED); 1739ea8dc4b6Seschrock DBUF_VERIFY(db); 1740ea8dc4b6Seschrock db->db_buf = NULL; 1741ea8dc4b6Seschrock dbuf_evict(db); 1742ea8dc4b6Seschrock } else { 1743ea8dc4b6Seschrock mutex_exit(&db->db_mtx); 1744ea8dc4b6Seschrock dbuf_destroy(db); 1745fa9e4066Sahrens } 1746ea8dc4b6Seschrock return (0); 1747fa9e4066Sahrens } 1748fa9e4066Sahrens 1749fa9e4066Sahrens static void 1750fa9e4066Sahrens dbuf_destroy(dmu_buf_impl_t *db) 1751fa9e4066Sahrens { 1752fa9e4066Sahrens ASSERT(refcount_is_zero(&db->db_holds)); 1753fa9e4066Sahrens 17540a586ceaSMark Shellenbaum if (db->db_blkid != DMU_BONUS_BLKID) { 1755ea8dc4b6Seschrock /* 1756ea8dc4b6Seschrock * If this dbuf is still on the dn_dbufs list, 1757ea8dc4b6Seschrock * remove it from that list. 1758ea8dc4b6Seschrock */ 1759744947dcSTom Erickson if (db->db_dnode_handle != NULL) { 1760744947dcSTom Erickson dnode_t *dn; 17611934e92fSmaybee 1762744947dcSTom Erickson DB_DNODE_ENTER(db); 1763744947dcSTom Erickson dn = DB_DNODE(db); 17641934e92fSmaybee mutex_enter(&dn->dn_dbufs_mtx); 1765ea8dc4b6Seschrock list_remove(&dn->dn_dbufs, db); 1766744947dcSTom Erickson (void) atomic_dec_32_nv(&dn->dn_dbufs_count); 1767c543ec06Sahrens mutex_exit(&dn->dn_dbufs_mtx); 1768744947dcSTom Erickson DB_DNODE_EXIT(db); 1769744947dcSTom Erickson /* 1770744947dcSTom Erickson * Decrementing the dbuf count means that the hold 1771744947dcSTom Erickson * corresponding to the removed dbuf is no longer 1772744947dcSTom Erickson * discounted in dnode_move(), so the dnode cannot be 1773744947dcSTom Erickson * moved until after we release the hold. 1774744947dcSTom Erickson */ 1775ea8dc4b6Seschrock dnode_rele(dn, db); 1776744947dcSTom Erickson db->db_dnode_handle = NULL; 1777ea8dc4b6Seschrock } 1778ea8dc4b6Seschrock dbuf_hash_remove(db); 1779ea8dc4b6Seschrock } 1780ea8dc4b6Seschrock db->db_parent = NULL; 1781ea8dc4b6Seschrock db->db_buf = NULL; 1782ea8dc4b6Seschrock 1783f82bfe17Sgw ASSERT(!list_link_active(&db->db_link)); 1784fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 1785fa9e4066Sahrens ASSERT(db->db_hash_next == NULL); 1786fa9e4066Sahrens ASSERT(db->db_blkptr == NULL); 1787fa9e4066Sahrens ASSERT(db->db_data_pending == NULL); 1788fa9e4066Sahrens 1789fa9e4066Sahrens kmem_cache_free(dbuf_cache, db); 17905a98e54bSBrendan Gregg - Sun Microsystems arc_space_return(sizeof (dmu_buf_impl_t), ARC_SPACE_OTHER); 1791fa9e4066Sahrens } 1792fa9e4066Sahrens 1793fa9e4066Sahrens void 1794fa9e4066Sahrens dbuf_prefetch(dnode_t *dn, uint64_t blkid) 1795fa9e4066Sahrens { 179613506d1eSmaybee dmu_buf_impl_t *db = NULL; 1797fa9e4066Sahrens blkptr_t *bp = NULL; 1798fa9e4066Sahrens 17990a586ceaSMark Shellenbaum ASSERT(blkid != DMU_BONUS_BLKID); 1800fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 1801fa9e4066Sahrens 1802fa9e4066Sahrens if (dnode_block_freed(dn, blkid)) 1803fa9e4066Sahrens return; 1804fa9e4066Sahrens 1805fa9e4066Sahrens /* dbuf_find() returns with db_mtx held */ 1806fa9e4066Sahrens if (db = dbuf_find(dn, 0, blkid)) { 18079e9c486fSGeorge Wilson /* 18089e9c486fSGeorge Wilson * This dbuf is already in the cache. We assume that 18099e9c486fSGeorge Wilson * it is already CACHED, or else about to be either 18109e9c486fSGeorge Wilson * read or filled. 18119e9c486fSGeorge Wilson */ 1812fa9e4066Sahrens mutex_exit(&db->db_mtx); 18139e9c486fSGeorge Wilson return; 1814fa9e4066Sahrens } 1815fa9e4066Sahrens 181613506d1eSmaybee if (dbuf_findbp(dn, 0, blkid, TRUE, &db, &bp) == 0) { 1817fa9e4066Sahrens if (bp && !BP_IS_HOLE(bp)) { 1818c7cd2421SGeorge Wilson int priority = dn->dn_type == DMU_OT_DDT_ZAP ? 1819c7cd2421SGeorge Wilson ZIO_PRIORITY_DDT_PREFETCH : ZIO_PRIORITY_ASYNC_READ; 1820b24ab676SJeff Bonwick dsl_dataset_t *ds = dn->dn_objset->os_dsl_dataset; 182113506d1eSmaybee uint32_t aflags = ARC_NOWAIT | ARC_PREFETCH; 1822ea8dc4b6Seschrock zbookmark_t zb; 1823b24ab676SJeff Bonwick 1824b24ab676SJeff Bonwick SET_BOOKMARK(&zb, ds ? ds->ds_object : DMU_META_OBJSET, 1825b24ab676SJeff Bonwick dn->dn_object, 0, blkid); 1826ea8dc4b6Seschrock 1827*1b912ec7SGeorge Wilson (void) arc_read(NULL, dn->dn_objset->os_spa, 1828*1b912ec7SGeorge Wilson bp, NULL, NULL, priority, 1829fa9e4066Sahrens ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE, 183013506d1eSmaybee &aflags, &zb); 1831fa9e4066Sahrens } 183213506d1eSmaybee if (db) 183313506d1eSmaybee dbuf_rele(db, NULL); 1834fa9e4066Sahrens } 1835fa9e4066Sahrens } 1836fa9e4066Sahrens 1837fa9e4066Sahrens /* 1838fa9e4066Sahrens * Returns with db_holds incremented, and db_mtx not held. 1839fa9e4066Sahrens * Note: dn_struct_rwlock must be held. 1840fa9e4066Sahrens */ 1841fa9e4066Sahrens int 1842fa9e4066Sahrens dbuf_hold_impl(dnode_t *dn, uint8_t level, uint64_t blkid, int fail_sparse, 1843fa9e4066Sahrens void *tag, dmu_buf_impl_t **dbp) 1844fa9e4066Sahrens { 1845fa9e4066Sahrens dmu_buf_impl_t *db, *parent = NULL; 1846fa9e4066Sahrens 18470a586ceaSMark Shellenbaum ASSERT(blkid != DMU_BONUS_BLKID); 1848fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 1849fa9e4066Sahrens ASSERT3U(dn->dn_nlevels, >, level); 1850fa9e4066Sahrens 1851fa9e4066Sahrens *dbp = NULL; 1852ea8dc4b6Seschrock top: 1853fa9e4066Sahrens /* dbuf_find() returns with db_mtx held */ 1854fa9e4066Sahrens db = dbuf_find(dn, level, blkid); 1855fa9e4066Sahrens 1856fa9e4066Sahrens if (db == NULL) { 1857fa9e4066Sahrens blkptr_t *bp = NULL; 1858fa9e4066Sahrens int err; 1859fa9e4066Sahrens 1860c543ec06Sahrens ASSERT3P(parent, ==, NULL); 1861fa9e4066Sahrens err = dbuf_findbp(dn, level, blkid, fail_sparse, &parent, &bp); 1862fa9e4066Sahrens if (fail_sparse) { 1863fa9e4066Sahrens if (err == 0 && bp && BP_IS_HOLE(bp)) 1864fa9e4066Sahrens err = ENOENT; 1865fa9e4066Sahrens if (err) { 1866c543ec06Sahrens if (parent) 1867ea8dc4b6Seschrock dbuf_rele(parent, NULL); 1868fa9e4066Sahrens return (err); 1869fa9e4066Sahrens } 1870fa9e4066Sahrens } 1871ea8dc4b6Seschrock if (err && err != ENOENT) 1872ea8dc4b6Seschrock return (err); 1873fa9e4066Sahrens db = dbuf_create(dn, level, blkid, parent, bp); 1874fa9e4066Sahrens } 1875fa9e4066Sahrens 1876ea8dc4b6Seschrock if (db->db_buf && refcount_is_zero(&db->db_holds)) { 1877ea8dc4b6Seschrock arc_buf_add_ref(db->db_buf, db); 1878ea8dc4b6Seschrock if (db->db_buf->b_data == NULL) { 1879ea8dc4b6Seschrock dbuf_clear(db); 1880c543ec06Sahrens if (parent) { 1881c543ec06Sahrens dbuf_rele(parent, NULL); 1882c543ec06Sahrens parent = NULL; 1883c543ec06Sahrens } 1884ea8dc4b6Seschrock goto top; 1885ea8dc4b6Seschrock } 1886ea8dc4b6Seschrock ASSERT3P(db->db.db_data, ==, db->db_buf->b_data); 1887ea8dc4b6Seschrock } 1888ea8dc4b6Seschrock 1889ea8dc4b6Seschrock ASSERT(db->db_buf == NULL || arc_referenced(db->db_buf)); 1890ea8dc4b6Seschrock 1891fa9e4066Sahrens /* 1892c717a561Smaybee * If this buffer is currently syncing out, and we are are 1893c717a561Smaybee * still referencing it from db_data, we need to make a copy 1894c717a561Smaybee * of it in case we decide we want to dirty it again in this txg. 1895fa9e4066Sahrens */ 18960a586ceaSMark Shellenbaum if (db->db_level == 0 && db->db_blkid != DMU_BONUS_BLKID && 1897ea8dc4b6Seschrock dn->dn_object != DMU_META_DNODE_OBJECT && 1898c717a561Smaybee db->db_state == DB_CACHED && db->db_data_pending) { 1899c717a561Smaybee dbuf_dirty_record_t *dr = db->db_data_pending; 1900fa9e4066Sahrens 1901c717a561Smaybee if (dr->dt.dl.dr_data == db->db_buf) { 1902c717a561Smaybee arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 1903c717a561Smaybee 1904c717a561Smaybee dbuf_set_data(db, 1905744947dcSTom Erickson arc_buf_alloc(dn->dn_objset->os_spa, 1906c717a561Smaybee db->db.db_size, db, type)); 1907c717a561Smaybee bcopy(dr->dt.dl.dr_data->b_data, db->db.db_data, 1908c717a561Smaybee db->db.db_size); 1909c717a561Smaybee } 1910fa9e4066Sahrens } 1911fa9e4066Sahrens 1912ea8dc4b6Seschrock (void) refcount_add(&db->db_holds, tag); 1913fa9e4066Sahrens dbuf_update_data(db); 19149c9dc39aSek DBUF_VERIFY(db); 1915fa9e4066Sahrens mutex_exit(&db->db_mtx); 1916fa9e4066Sahrens 1917fa9e4066Sahrens /* NOTE: we can't rele the parent until after we drop the db_mtx */ 1918c543ec06Sahrens if (parent) 1919ea8dc4b6Seschrock dbuf_rele(parent, NULL); 1920fa9e4066Sahrens 1921744947dcSTom Erickson ASSERT3P(DB_DNODE(db), ==, dn); 1922fa9e4066Sahrens ASSERT3U(db->db_blkid, ==, blkid); 1923fa9e4066Sahrens ASSERT3U(db->db_level, ==, level); 1924fa9e4066Sahrens *dbp = db; 1925fa9e4066Sahrens 1926fa9e4066Sahrens return (0); 1927fa9e4066Sahrens } 1928fa9e4066Sahrens 1929fa9e4066Sahrens dmu_buf_impl_t * 1930ea8dc4b6Seschrock dbuf_hold(dnode_t *dn, uint64_t blkid, void *tag) 1931fa9e4066Sahrens { 1932fa9e4066Sahrens dmu_buf_impl_t *db; 1933ea8dc4b6Seschrock int err = dbuf_hold_impl(dn, 0, blkid, FALSE, tag, &db); 1934ea8dc4b6Seschrock return (err ? NULL : db); 1935fa9e4066Sahrens } 1936fa9e4066Sahrens 1937fa9e4066Sahrens dmu_buf_impl_t * 1938fa9e4066Sahrens dbuf_hold_level(dnode_t *dn, int level, uint64_t blkid, void *tag) 1939fa9e4066Sahrens { 1940fa9e4066Sahrens dmu_buf_impl_t *db; 1941ea8dc4b6Seschrock int err = dbuf_hold_impl(dn, level, blkid, FALSE, tag, &db); 1942ea8dc4b6Seschrock return (err ? NULL : db); 1943fa9e4066Sahrens } 1944fa9e4066Sahrens 19451934e92fSmaybee void 1946ea8dc4b6Seschrock dbuf_create_bonus(dnode_t *dn) 1947fa9e4066Sahrens { 1948ea8dc4b6Seschrock ASSERT(RW_WRITE_HELD(&dn->dn_struct_rwlock)); 1949ea8dc4b6Seschrock 1950ea8dc4b6Seschrock ASSERT(dn->dn_bonus == NULL); 19510a586ceaSMark Shellenbaum dn->dn_bonus = dbuf_create(dn, 0, DMU_BONUS_BLKID, dn->dn_dbuf, NULL); 19520a586ceaSMark Shellenbaum } 19530a586ceaSMark Shellenbaum 19540a586ceaSMark Shellenbaum int 19550a586ceaSMark Shellenbaum dbuf_spill_set_blksz(dmu_buf_t *db_fake, uint64_t blksz, dmu_tx_t *tx) 19560a586ceaSMark Shellenbaum { 19570a586ceaSMark Shellenbaum dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 1958744947dcSTom Erickson dnode_t *dn; 1959744947dcSTom Erickson 19600a586ceaSMark Shellenbaum if (db->db_blkid != DMU_SPILL_BLKID) 19610a586ceaSMark Shellenbaum return (ENOTSUP); 19620a586ceaSMark Shellenbaum if (blksz == 0) 19630a586ceaSMark Shellenbaum blksz = SPA_MINBLOCKSIZE; 19640a586ceaSMark Shellenbaum if (blksz > SPA_MAXBLOCKSIZE) 19650a586ceaSMark Shellenbaum blksz = SPA_MAXBLOCKSIZE; 19660a586ceaSMark Shellenbaum else 19670a586ceaSMark Shellenbaum blksz = P2ROUNDUP(blksz, SPA_MINBLOCKSIZE); 19680a586ceaSMark Shellenbaum 1969744947dcSTom Erickson DB_DNODE_ENTER(db); 1970744947dcSTom Erickson dn = DB_DNODE(db); 1971744947dcSTom Erickson rw_enter(&dn->dn_struct_rwlock, RW_WRITER); 19720a586ceaSMark Shellenbaum dbuf_new_size(db, blksz, tx); 1973744947dcSTom Erickson rw_exit(&dn->dn_struct_rwlock); 1974744947dcSTom Erickson DB_DNODE_EXIT(db); 19750a586ceaSMark Shellenbaum 19760a586ceaSMark Shellenbaum return (0); 19770a586ceaSMark Shellenbaum } 19780a586ceaSMark Shellenbaum 19790a586ceaSMark Shellenbaum void 19800a586ceaSMark Shellenbaum dbuf_rm_spill(dnode_t *dn, dmu_tx_t *tx) 19810a586ceaSMark Shellenbaum { 19820a586ceaSMark Shellenbaum dbuf_free_range(dn, DMU_SPILL_BLKID, DMU_SPILL_BLKID, tx); 1983fa9e4066Sahrens } 1984fa9e4066Sahrens 1985ea8dc4b6Seschrock #pragma weak dmu_buf_add_ref = dbuf_add_ref 1986fa9e4066Sahrens void 1987fa9e4066Sahrens dbuf_add_ref(dmu_buf_impl_t *db, void *tag) 1988fa9e4066Sahrens { 1989ea8dc4b6Seschrock int64_t holds = refcount_add(&db->db_holds, tag); 1990ea8dc4b6Seschrock ASSERT(holds > 1); 1991fa9e4066Sahrens } 1992fa9e4066Sahrens 1993744947dcSTom Erickson /* 1994744947dcSTom Erickson * If you call dbuf_rele() you had better not be referencing the dnode handle 1995744947dcSTom Erickson * unless you have some other direct or indirect hold on the dnode. (An indirect 1996744947dcSTom Erickson * hold is a hold on one of the dnode's dbufs, including the bonus buffer.) 1997744947dcSTom Erickson * Without that, the dbuf_rele() could lead to a dnode_rele() followed by the 1998744947dcSTom Erickson * dnode's parent dbuf evicting its dnode handles. 1999744947dcSTom Erickson */ 2000ea8dc4b6Seschrock #pragma weak dmu_buf_rele = dbuf_rele 2001fa9e4066Sahrens void 2002ea8dc4b6Seschrock dbuf_rele(dmu_buf_impl_t *db, void *tag) 2003b24ab676SJeff Bonwick { 2004b24ab676SJeff Bonwick mutex_enter(&db->db_mtx); 2005b24ab676SJeff Bonwick dbuf_rele_and_unlock(db, tag); 2006b24ab676SJeff Bonwick } 2007b24ab676SJeff Bonwick 2008b24ab676SJeff Bonwick /* 2009b24ab676SJeff Bonwick * dbuf_rele() for an already-locked dbuf. This is necessary to allow 2010b24ab676SJeff Bonwick * db_dirtycnt and db_holds to be updated atomically. 2011b24ab676SJeff Bonwick */ 2012b24ab676SJeff Bonwick void 2013b24ab676SJeff Bonwick dbuf_rele_and_unlock(dmu_buf_impl_t *db, void *tag) 2014fa9e4066Sahrens { 2015fa9e4066Sahrens int64_t holds; 2016fa9e4066Sahrens 2017b24ab676SJeff Bonwick ASSERT(MUTEX_HELD(&db->db_mtx)); 20189c9dc39aSek DBUF_VERIFY(db); 2019fa9e4066Sahrens 2020744947dcSTom Erickson /* 2021744947dcSTom Erickson * Remove the reference to the dbuf before removing its hold on the 2022744947dcSTom Erickson * dnode so we can guarantee in dnode_move() that a referenced bonus 2023744947dcSTom Erickson * buffer has a corresponding dnode hold. 2024744947dcSTom Erickson */ 2025fa9e4066Sahrens holds = refcount_remove(&db->db_holds, tag); 2026ea8dc4b6Seschrock ASSERT(holds >= 0); 2027ea8dc4b6Seschrock 2028c717a561Smaybee /* 2029c717a561Smaybee * We can't freeze indirects if there is a possibility that they 2030c717a561Smaybee * may be modified in the current syncing context. 2031c717a561Smaybee */ 2032c717a561Smaybee if (db->db_buf && holds == (db->db_level == 0 ? db->db_dirtycnt : 0)) 20336b4acc8bSahrens arc_buf_freeze(db->db_buf); 20346b4acc8bSahrens 2035ea8dc4b6Seschrock if (holds == db->db_dirtycnt && 2036c717a561Smaybee db->db_level == 0 && db->db_immediate_evict) 2037ea8dc4b6Seschrock dbuf_evict_user(db); 2038fa9e4066Sahrens 2039fa9e4066Sahrens if (holds == 0) { 20400a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 2041ea8dc4b6Seschrock mutex_exit(&db->db_mtx); 2042744947dcSTom Erickson 2043744947dcSTom Erickson /* 2044744947dcSTom Erickson * If the dnode moves here, we cannot cross this barrier 2045744947dcSTom Erickson * until the move completes. 2046744947dcSTom Erickson */ 2047744947dcSTom Erickson DB_DNODE_ENTER(db); 2048744947dcSTom Erickson (void) atomic_dec_32_nv(&DB_DNODE(db)->dn_dbufs_count); 2049744947dcSTom Erickson DB_DNODE_EXIT(db); 2050744947dcSTom Erickson /* 2051744947dcSTom Erickson * The bonus buffer's dnode hold is no longer discounted 2052744947dcSTom Erickson * in dnode_move(). The dnode cannot move until after 2053744947dcSTom Erickson * the dnode_rele(). 2054744947dcSTom Erickson */ 2055744947dcSTom Erickson dnode_rele(DB_DNODE(db), db); 2056ea8dc4b6Seschrock } else if (db->db_buf == NULL) { 2057ea8dc4b6Seschrock /* 2058ea8dc4b6Seschrock * This is a special case: we never associated this 2059ea8dc4b6Seschrock * dbuf with any data allocated from the ARC. 2060ea8dc4b6Seschrock */ 206182c9918fSTim Haley ASSERT(db->db_state == DB_UNCACHED || 206282c9918fSTim Haley db->db_state == DB_NOFILL); 2063ea8dc4b6Seschrock dbuf_evict(db); 20646b4acc8bSahrens } else if (arc_released(db->db_buf)) { 2065ea8dc4b6Seschrock arc_buf_t *buf = db->db_buf; 2066ea8dc4b6Seschrock /* 2067ea8dc4b6Seschrock * This dbuf has anonymous data associated with it. 2068ea8dc4b6Seschrock */ 2069ea8dc4b6Seschrock dbuf_set_data(db, NULL); 2070ea8dc4b6Seschrock VERIFY(arc_buf_remove_ref(buf, db) == 1); 2071ea8dc4b6Seschrock dbuf_evict(db); 2072ea8dc4b6Seschrock } else { 2073ea8dc4b6Seschrock VERIFY(arc_buf_remove_ref(db->db_buf, db) == 0); 20749253d63dSGeorge Wilson 20759253d63dSGeorge Wilson /* 20769253d63dSGeorge Wilson * A dbuf will be eligible for eviction if either the 20779253d63dSGeorge Wilson * 'primarycache' property is set or a duplicate 20789253d63dSGeorge Wilson * copy of this buffer is already cached in the arc. 20799253d63dSGeorge Wilson * 20809253d63dSGeorge Wilson * In the case of the 'primarycache' a buffer 20819253d63dSGeorge Wilson * is considered for eviction if it matches the 20829253d63dSGeorge Wilson * criteria set in the property. 20839253d63dSGeorge Wilson * 20849253d63dSGeorge Wilson * To decide if our buffer is considered a 20859253d63dSGeorge Wilson * duplicate, we must call into the arc to determine 20869253d63dSGeorge Wilson * if multiple buffers are referencing the same 20879253d63dSGeorge Wilson * block on-disk. If so, then we simply evict 20889253d63dSGeorge Wilson * ourselves. 20899253d63dSGeorge Wilson */ 20909253d63dSGeorge Wilson if (!DBUF_IS_CACHEABLE(db) || 20919253d63dSGeorge Wilson arc_buf_eviction_needed(db->db_buf)) 20923baa08fcSek dbuf_clear(db); 20933baa08fcSek else 20943baa08fcSek mutex_exit(&db->db_mtx); 2095ea8dc4b6Seschrock } 2096fa9e4066Sahrens } else { 2097fa9e4066Sahrens mutex_exit(&db->db_mtx); 2098fa9e4066Sahrens } 2099fa9e4066Sahrens } 2100fa9e4066Sahrens 2101fa9e4066Sahrens #pragma weak dmu_buf_refcount = dbuf_refcount 2102fa9e4066Sahrens uint64_t 2103fa9e4066Sahrens dbuf_refcount(dmu_buf_impl_t *db) 2104fa9e4066Sahrens { 2105fa9e4066Sahrens return (refcount_count(&db->db_holds)); 2106fa9e4066Sahrens } 2107fa9e4066Sahrens 2108fa9e4066Sahrens void * 2109fa9e4066Sahrens dmu_buf_set_user(dmu_buf_t *db_fake, void *user_ptr, void *user_data_ptr_ptr, 2110fa9e4066Sahrens dmu_buf_evict_func_t *evict_func) 2111fa9e4066Sahrens { 2112fa9e4066Sahrens return (dmu_buf_update_user(db_fake, NULL, user_ptr, 2113fa9e4066Sahrens user_data_ptr_ptr, evict_func)); 2114fa9e4066Sahrens } 2115fa9e4066Sahrens 2116fa9e4066Sahrens void * 2117fa9e4066Sahrens dmu_buf_set_user_ie(dmu_buf_t *db_fake, void *user_ptr, void *user_data_ptr_ptr, 2118fa9e4066Sahrens dmu_buf_evict_func_t *evict_func) 2119fa9e4066Sahrens { 2120fa9e4066Sahrens dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 2121fa9e4066Sahrens 2122c717a561Smaybee db->db_immediate_evict = TRUE; 2123fa9e4066Sahrens return (dmu_buf_update_user(db_fake, NULL, user_ptr, 2124fa9e4066Sahrens user_data_ptr_ptr, evict_func)); 2125fa9e4066Sahrens } 2126fa9e4066Sahrens 2127fa9e4066Sahrens void * 2128fa9e4066Sahrens dmu_buf_update_user(dmu_buf_t *db_fake, void *old_user_ptr, void *user_ptr, 2129fa9e4066Sahrens void *user_data_ptr_ptr, dmu_buf_evict_func_t *evict_func) 2130fa9e4066Sahrens { 2131fa9e4066Sahrens dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 2132fa9e4066Sahrens ASSERT(db->db_level == 0); 2133fa9e4066Sahrens 2134fa9e4066Sahrens ASSERT((user_ptr == NULL) == (evict_func == NULL)); 2135fa9e4066Sahrens 2136fa9e4066Sahrens mutex_enter(&db->db_mtx); 2137fa9e4066Sahrens 2138c717a561Smaybee if (db->db_user_ptr == old_user_ptr) { 2139c717a561Smaybee db->db_user_ptr = user_ptr; 2140c717a561Smaybee db->db_user_data_ptr_ptr = user_data_ptr_ptr; 2141c717a561Smaybee db->db_evict_func = evict_func; 2142fa9e4066Sahrens 2143fa9e4066Sahrens dbuf_update_data(db); 2144fa9e4066Sahrens } else { 2145c717a561Smaybee old_user_ptr = db->db_user_ptr; 2146fa9e4066Sahrens } 2147fa9e4066Sahrens 2148fa9e4066Sahrens mutex_exit(&db->db_mtx); 2149fa9e4066Sahrens return (old_user_ptr); 2150fa9e4066Sahrens } 2151fa9e4066Sahrens 2152fa9e4066Sahrens void * 2153fa9e4066Sahrens dmu_buf_get_user(dmu_buf_t *db_fake) 2154fa9e4066Sahrens { 2155fa9e4066Sahrens dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 2156fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 2157fa9e4066Sahrens 2158c717a561Smaybee return (db->db_user_ptr); 2159fa9e4066Sahrens } 2160fa9e4066Sahrens 21613d692628SSanjeev Bagewadi boolean_t 21623d692628SSanjeev Bagewadi dmu_buf_freeable(dmu_buf_t *dbuf) 21633d692628SSanjeev Bagewadi { 21643d692628SSanjeev Bagewadi boolean_t res = B_FALSE; 21653d692628SSanjeev Bagewadi dmu_buf_impl_t *db = (dmu_buf_impl_t *)dbuf; 21663d692628SSanjeev Bagewadi 21673d692628SSanjeev Bagewadi if (db->db_blkptr) 21683d692628SSanjeev Bagewadi res = dsl_dataset_block_freeable(db->db_objset->os_dsl_dataset, 2169c7cd2421SGeorge Wilson db->db_blkptr, db->db_blkptr->blk_birth); 21703d692628SSanjeev Bagewadi 21713d692628SSanjeev Bagewadi return (res); 21723d692628SSanjeev Bagewadi } 21733d692628SSanjeev Bagewadi 217480901aeaSGeorge Wilson blkptr_t * 217580901aeaSGeorge Wilson dmu_buf_get_blkptr(dmu_buf_t *db) 217680901aeaSGeorge Wilson { 217780901aeaSGeorge Wilson dmu_buf_impl_t *dbi = (dmu_buf_impl_t *)db; 217880901aeaSGeorge Wilson return (dbi->db_blkptr); 217980901aeaSGeorge Wilson } 218080901aeaSGeorge Wilson 2181c717a561Smaybee static void 2182c717a561Smaybee dbuf_check_blkptr(dnode_t *dn, dmu_buf_impl_t *db) 2183fa9e4066Sahrens { 2184c717a561Smaybee /* ASSERT(dmu_tx_is_syncing(tx) */ 2185c717a561Smaybee ASSERT(MUTEX_HELD(&db->db_mtx)); 2186c717a561Smaybee 2187c717a561Smaybee if (db->db_blkptr != NULL) 2188c717a561Smaybee return; 2189c717a561Smaybee 21900a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) { 21910a586ceaSMark Shellenbaum db->db_blkptr = &dn->dn_phys->dn_spill; 21920a586ceaSMark Shellenbaum BP_ZERO(db->db_blkptr); 21930a586ceaSMark Shellenbaum return; 21940a586ceaSMark Shellenbaum } 2195c717a561Smaybee if (db->db_level == dn->dn_phys->dn_nlevels-1) { 2196c717a561Smaybee /* 2197c717a561Smaybee * This buffer was allocated at a time when there was 2198c717a561Smaybee * no available blkptrs from the dnode, or it was 2199c717a561Smaybee * inappropriate to hook it in (i.e., nlevels mis-match). 2200c717a561Smaybee */ 2201c717a561Smaybee ASSERT(db->db_blkid < dn->dn_phys->dn_nblkptr); 2202c717a561Smaybee ASSERT(db->db_parent == NULL); 2203c717a561Smaybee db->db_parent = dn->dn_dbuf; 2204c717a561Smaybee db->db_blkptr = &dn->dn_phys->dn_blkptr[db->db_blkid]; 2205c717a561Smaybee DBUF_VERIFY(db); 2206c717a561Smaybee } else { 2207c717a561Smaybee dmu_buf_impl_t *parent = db->db_parent; 2208c717a561Smaybee int epbs = dn->dn_phys->dn_indblkshift - SPA_BLKPTRSHIFT; 2209c717a561Smaybee 2210c717a561Smaybee ASSERT(dn->dn_phys->dn_nlevels > 1); 2211c717a561Smaybee if (parent == NULL) { 2212c717a561Smaybee mutex_exit(&db->db_mtx); 2213c717a561Smaybee rw_enter(&dn->dn_struct_rwlock, RW_READER); 2214c717a561Smaybee (void) dbuf_hold_impl(dn, db->db_level+1, 2215c717a561Smaybee db->db_blkid >> epbs, FALSE, db, &parent); 2216c717a561Smaybee rw_exit(&dn->dn_struct_rwlock); 2217c717a561Smaybee mutex_enter(&db->db_mtx); 2218c717a561Smaybee db->db_parent = parent; 2219c717a561Smaybee } 2220c717a561Smaybee db->db_blkptr = (blkptr_t *)parent->db.db_data + 2221c717a561Smaybee (db->db_blkid & ((1ULL << epbs) - 1)); 2222c717a561Smaybee DBUF_VERIFY(db); 2223c717a561Smaybee } 2224c717a561Smaybee } 2225c717a561Smaybee 2226c717a561Smaybee static void 2227c717a561Smaybee dbuf_sync_indirect(dbuf_dirty_record_t *dr, dmu_tx_t *tx) 2228c717a561Smaybee { 2229c717a561Smaybee dmu_buf_impl_t *db = dr->dr_dbuf; 2230744947dcSTom Erickson dnode_t *dn; 2231c717a561Smaybee zio_t *zio; 2232c717a561Smaybee 2233c717a561Smaybee ASSERT(dmu_tx_is_syncing(tx)); 2234c717a561Smaybee 2235c717a561Smaybee dprintf_dbuf_bp(db, db->db_blkptr, "blkptr=%p", db->db_blkptr); 2236c717a561Smaybee 2237c717a561Smaybee mutex_enter(&db->db_mtx); 2238c717a561Smaybee 2239c717a561Smaybee ASSERT(db->db_level > 0); 2240c717a561Smaybee DBUF_VERIFY(db); 2241c717a561Smaybee 2242c717a561Smaybee if (db->db_buf == NULL) { 2243c717a561Smaybee mutex_exit(&db->db_mtx); 2244c717a561Smaybee (void) dbuf_read(db, NULL, DB_RF_MUST_SUCCEED); 2245c717a561Smaybee mutex_enter(&db->db_mtx); 2246c717a561Smaybee } 2247c717a561Smaybee ASSERT3U(db->db_state, ==, DB_CACHED); 2248c717a561Smaybee ASSERT(db->db_buf != NULL); 2249c717a561Smaybee 2250744947dcSTom Erickson DB_DNODE_ENTER(db); 2251744947dcSTom Erickson dn = DB_DNODE(db); 2252744947dcSTom Erickson ASSERT3U(db->db.db_size, ==, 1<<dn->dn_phys->dn_indblkshift); 2253c717a561Smaybee dbuf_check_blkptr(dn, db); 2254744947dcSTom Erickson DB_DNODE_EXIT(db); 2255c717a561Smaybee 2256c717a561Smaybee db->db_data_pending = dr; 2257c717a561Smaybee 2258af2c4821Smaybee mutex_exit(&db->db_mtx); 2259088f3894Sahrens dbuf_write(dr, db->db_buf, tx); 2260c717a561Smaybee 2261c717a561Smaybee zio = dr->dr_zio; 2262c717a561Smaybee mutex_enter(&dr->dt.di.dr_mtx); 2263c717a561Smaybee dbuf_sync_list(&dr->dt.di.dr_children, tx); 2264c717a561Smaybee ASSERT(list_head(&dr->dt.di.dr_children) == NULL); 2265c717a561Smaybee mutex_exit(&dr->dt.di.dr_mtx); 2266c717a561Smaybee zio_nowait(zio); 2267c717a561Smaybee } 2268c717a561Smaybee 2269c717a561Smaybee static void 2270c717a561Smaybee dbuf_sync_leaf(dbuf_dirty_record_t *dr, dmu_tx_t *tx) 2271c717a561Smaybee { 2272c717a561Smaybee arc_buf_t **datap = &dr->dt.dl.dr_data; 2273c717a561Smaybee dmu_buf_impl_t *db = dr->dr_dbuf; 2274744947dcSTom Erickson dnode_t *dn; 2275744947dcSTom Erickson objset_t *os; 2276c717a561Smaybee uint64_t txg = tx->tx_txg; 2277fa9e4066Sahrens 2278fa9e4066Sahrens ASSERT(dmu_tx_is_syncing(tx)); 2279fa9e4066Sahrens 2280fa9e4066Sahrens dprintf_dbuf_bp(db, db->db_blkptr, "blkptr=%p", db->db_blkptr); 2281fa9e4066Sahrens 2282fa9e4066Sahrens mutex_enter(&db->db_mtx); 2283fa9e4066Sahrens /* 2284fa9e4066Sahrens * To be synced, we must be dirtied. But we 2285fa9e4066Sahrens * might have been freed after the dirty. 2286fa9e4066Sahrens */ 2287fa9e4066Sahrens if (db->db_state == DB_UNCACHED) { 2288fa9e4066Sahrens /* This buffer has been freed since it was dirtied */ 2289fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 2290fa9e4066Sahrens } else if (db->db_state == DB_FILL) { 2291fa9e4066Sahrens /* This buffer was freed and is now being re-filled */ 2292c717a561Smaybee ASSERT(db->db.db_data != dr->dt.dl.dr_data); 2293fa9e4066Sahrens } else { 229482c9918fSTim Haley ASSERT(db->db_state == DB_CACHED || db->db_state == DB_NOFILL); 2295fa9e4066Sahrens } 22969c9dc39aSek DBUF_VERIFY(db); 2297fa9e4066Sahrens 2298744947dcSTom Erickson DB_DNODE_ENTER(db); 2299744947dcSTom Erickson dn = DB_DNODE(db); 2300744947dcSTom Erickson 23010a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) { 23020a586ceaSMark Shellenbaum mutex_enter(&dn->dn_mtx); 23030a586ceaSMark Shellenbaum dn->dn_phys->dn_flags |= DNODE_FLAG_SPILL_BLKPTR; 23040a586ceaSMark Shellenbaum mutex_exit(&dn->dn_mtx); 23050a586ceaSMark Shellenbaum } 23060a586ceaSMark Shellenbaum 2307fa9e4066Sahrens /* 2308c717a561Smaybee * If this is a bonus buffer, simply copy the bonus data into the 2309c717a561Smaybee * dnode. It will be written out when the dnode is synced (and it 2310c717a561Smaybee * will be synced, since it must have been dirty for dbuf_sync to 2311c717a561Smaybee * be called). 2312fa9e4066Sahrens */ 23130a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 2314c717a561Smaybee dbuf_dirty_record_t **drp; 23151934e92fSmaybee 2316ea8dc4b6Seschrock ASSERT(*datap != NULL); 2317fb09f5aaSMadhav Suresh ASSERT0(db->db_level); 2318ea8dc4b6Seschrock ASSERT3U(dn->dn_phys->dn_bonuslen, <=, DN_MAX_BONUSLEN); 2319ea8dc4b6Seschrock bcopy(*datap, DN_BONUS(dn->dn_phys), dn->dn_phys->dn_bonuslen); 2320744947dcSTom Erickson DB_DNODE_EXIT(db); 2321744947dcSTom Erickson 23220e8c6158Smaybee if (*datap != db->db.db_data) { 2323ea8dc4b6Seschrock zio_buf_free(*datap, DN_MAX_BONUSLEN); 23245a98e54bSBrendan Gregg - Sun Microsystems arc_space_return(DN_MAX_BONUSLEN, ARC_SPACE_OTHER); 23250e8c6158Smaybee } 2326ea8dc4b6Seschrock db->db_data_pending = NULL; 2327c717a561Smaybee drp = &db->db_last_dirty; 2328c717a561Smaybee while (*drp != dr) 2329c717a561Smaybee drp = &(*drp)->dr_next; 233017f17c2dSbonwick ASSERT(dr->dr_next == NULL); 2331b24ab676SJeff Bonwick ASSERT(dr->dr_dbuf == db); 233217f17c2dSbonwick *drp = dr->dr_next; 2333c717a561Smaybee kmem_free(dr, sizeof (dbuf_dirty_record_t)); 2334ea8dc4b6Seschrock ASSERT(db->db_dirtycnt > 0); 2335ea8dc4b6Seschrock db->db_dirtycnt -= 1; 2336b24ab676SJeff Bonwick dbuf_rele_and_unlock(db, (void *)(uintptr_t)txg); 2337ea8dc4b6Seschrock return; 2338ea8dc4b6Seschrock } 2339ea8dc4b6Seschrock 2340744947dcSTom Erickson os = dn->dn_objset; 2341744947dcSTom Erickson 2342f82bfe17Sgw /* 2343f82bfe17Sgw * This function may have dropped the db_mtx lock allowing a dmu_sync 2344f82bfe17Sgw * operation to sneak in. As a result, we need to ensure that we 2345f82bfe17Sgw * don't check the dr_override_state until we have returned from 2346f82bfe17Sgw * dbuf_check_blkptr. 2347f82bfe17Sgw */ 2348f82bfe17Sgw dbuf_check_blkptr(dn, db); 2349f82bfe17Sgw 2350c717a561Smaybee /* 2351744947dcSTom Erickson * If this buffer is in the middle of an immediate write, 2352c717a561Smaybee * wait for the synchronous IO to complete. 2353c717a561Smaybee */ 2354c717a561Smaybee while (dr->dt.dl.dr_override_state == DR_IN_DMU_SYNC) { 2355c717a561Smaybee ASSERT(dn->dn_object != DMU_META_DNODE_OBJECT); 2356c717a561Smaybee cv_wait(&db->db_changed, &db->db_mtx); 2357c717a561Smaybee ASSERT(dr->dt.dl.dr_override_state != DR_NOT_OVERRIDDEN); 2358c717a561Smaybee } 2359c5c6ffa0Smaybee 2360ab69d62fSMatthew Ahrens if (db->db_state != DB_NOFILL && 2361ab69d62fSMatthew Ahrens dn->dn_object != DMU_META_DNODE_OBJECT && 2362ab69d62fSMatthew Ahrens refcount_count(&db->db_holds) > 1 && 2363b24ab676SJeff Bonwick dr->dt.dl.dr_override_state != DR_OVERRIDDEN && 2364ab69d62fSMatthew Ahrens *datap == db->db_buf) { 2365ab69d62fSMatthew Ahrens /* 2366ab69d62fSMatthew Ahrens * If this buffer is currently "in use" (i.e., there 2367ab69d62fSMatthew Ahrens * are active holds and db_data still references it), 2368ab69d62fSMatthew Ahrens * then make a copy before we start the write so that 2369ab69d62fSMatthew Ahrens * any modifications from the open txg will not leak 2370ab69d62fSMatthew Ahrens * into this write. 2371ab69d62fSMatthew Ahrens * 2372ab69d62fSMatthew Ahrens * NOTE: this copy does not need to be made for 2373ab69d62fSMatthew Ahrens * objects only modified in the syncing context (e.g. 2374ab69d62fSMatthew Ahrens * DNONE_DNODE blocks). 2375ab69d62fSMatthew Ahrens */ 2376ab69d62fSMatthew Ahrens int blksz = arc_buf_size(*datap); 2377ab69d62fSMatthew Ahrens arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 2378ab69d62fSMatthew Ahrens *datap = arc_buf_alloc(os->os_spa, blksz, db, type); 2379ab69d62fSMatthew Ahrens bcopy(db->db.db_data, (*datap)->b_data, blksz); 238082c9918fSTim Haley } 2381c717a561Smaybee db->db_data_pending = dr; 2382fa9e4066Sahrens 2383c717a561Smaybee mutex_exit(&db->db_mtx); 2384fa9e4066Sahrens 2385088f3894Sahrens dbuf_write(dr, *datap, tx); 2386fa9e4066Sahrens 2387c717a561Smaybee ASSERT(!list_link_active(&dr->dr_dirty_node)); 2388744947dcSTom Erickson if (dn->dn_object == DMU_META_DNODE_OBJECT) { 2389c717a561Smaybee list_insert_tail(&dn->dn_dirty_records[txg&TXG_MASK], dr); 2390744947dcSTom Erickson DB_DNODE_EXIT(db); 2391744947dcSTom Erickson } else { 2392744947dcSTom Erickson /* 2393744947dcSTom Erickson * Although zio_nowait() does not "wait for an IO", it does 2394744947dcSTom Erickson * initiate the IO. If this is an empty write it seems plausible 2395744947dcSTom Erickson * that the IO could actually be completed before the nowait 2396744947dcSTom Erickson * returns. We need to DB_DNODE_EXIT() first in case 2397744947dcSTom Erickson * zio_nowait() invalidates the dbuf. 2398744947dcSTom Erickson */ 2399744947dcSTom Erickson DB_DNODE_EXIT(db); 2400c717a561Smaybee zio_nowait(dr->dr_zio); 2401744947dcSTom Erickson } 2402c717a561Smaybee } 240323b11526Smaybee 2404c717a561Smaybee void 2405c717a561Smaybee dbuf_sync_list(list_t *list, dmu_tx_t *tx) 2406c717a561Smaybee { 2407c717a561Smaybee dbuf_dirty_record_t *dr; 2408c717a561Smaybee 2409c717a561Smaybee while (dr = list_head(list)) { 2410c717a561Smaybee if (dr->dr_zio != NULL) { 2411c717a561Smaybee /* 2412c717a561Smaybee * If we find an already initialized zio then we 2413c717a561Smaybee * are processing the meta-dnode, and we have finished. 2414c717a561Smaybee * The dbufs for all dnodes are put back on the list 2415c717a561Smaybee * during processing, so that we can zio_wait() 2416c717a561Smaybee * these IOs after initiating all child IOs. 2417c717a561Smaybee */ 2418c717a561Smaybee ASSERT3U(dr->dr_dbuf->db.db_object, ==, 2419c717a561Smaybee DMU_META_DNODE_OBJECT); 2420c717a561Smaybee break; 242123b11526Smaybee } 2422c717a561Smaybee list_remove(list, dr); 2423c717a561Smaybee if (dr->dr_dbuf->db_level > 0) 2424c717a561Smaybee dbuf_sync_indirect(dr, tx); 2425c717a561Smaybee else 2426c717a561Smaybee dbuf_sync_leaf(dr, tx); 242723b11526Smaybee } 2428c717a561Smaybee } 242923b11526Smaybee 2430fa9e4066Sahrens /* ARGSUSED */ 2431fa9e4066Sahrens static void 2432c717a561Smaybee dbuf_write_ready(zio_t *zio, arc_buf_t *buf, void *vdb) 2433fa9e4066Sahrens { 2434fa9e4066Sahrens dmu_buf_impl_t *db = vdb; 2435744947dcSTom Erickson dnode_t *dn; 2436e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 2437c717a561Smaybee blkptr_t *bp_orig = &zio->io_bp_orig; 2438b24ab676SJeff Bonwick spa_t *spa = zio->io_spa; 2439b24ab676SJeff Bonwick int64_t delta; 2440fa9e4066Sahrens uint64_t fill = 0; 2441b24ab676SJeff Bonwick int i; 2442fa9e4066Sahrens 2443e14bb325SJeff Bonwick ASSERT(db->db_blkptr == bp); 2444e14bb325SJeff Bonwick 2445744947dcSTom Erickson DB_DNODE_ENTER(db); 2446744947dcSTom Erickson dn = DB_DNODE(db); 2447b24ab676SJeff Bonwick delta = bp_get_dsize_sync(spa, bp) - bp_get_dsize_sync(spa, bp_orig); 2448b24ab676SJeff Bonwick dnode_diduse_space(dn, delta - zio->io_prev_space_delta); 2449b24ab676SJeff Bonwick zio->io_prev_space_delta = delta; 2450fa9e4066Sahrens 2451e14bb325SJeff Bonwick if (BP_IS_HOLE(bp)) { 2452b24ab676SJeff Bonwick ASSERT(bp->blk_fill == 0); 2453744947dcSTom Erickson DB_DNODE_EXIT(db); 2454c717a561Smaybee return; 2455c717a561Smaybee } 2456c5c6ffa0Smaybee 24570a586ceaSMark Shellenbaum ASSERT((db->db_blkid != DMU_SPILL_BLKID && 24580a586ceaSMark Shellenbaum BP_GET_TYPE(bp) == dn->dn_type) || 24590a586ceaSMark Shellenbaum (db->db_blkid == DMU_SPILL_BLKID && 24600a586ceaSMark Shellenbaum BP_GET_TYPE(bp) == dn->dn_bonustype)); 2461e14bb325SJeff Bonwick ASSERT(BP_GET_LEVEL(bp) == db->db_level); 2462e14bb325SJeff Bonwick 2463c717a561Smaybee mutex_enter(&db->db_mtx); 2464fa9e4066Sahrens 24650a586ceaSMark Shellenbaum #ifdef ZFS_DEBUG 24660a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) { 24670a586ceaSMark Shellenbaum ASSERT(dn->dn_phys->dn_flags & DNODE_FLAG_SPILL_BLKPTR); 24680a586ceaSMark Shellenbaum ASSERT(!(BP_IS_HOLE(db->db_blkptr)) && 24690a586ceaSMark Shellenbaum db->db_blkptr == &dn->dn_phys->dn_spill); 24700a586ceaSMark Shellenbaum } 24710a586ceaSMark Shellenbaum #endif 24720a586ceaSMark Shellenbaum 2473fa9e4066Sahrens if (db->db_level == 0) { 2474fa9e4066Sahrens mutex_enter(&dn->dn_mtx); 24750a586ceaSMark Shellenbaum if (db->db_blkid > dn->dn_phys->dn_maxblkid && 24760a586ceaSMark Shellenbaum db->db_blkid != DMU_SPILL_BLKID) 2477fa9e4066Sahrens dn->dn_phys->dn_maxblkid = db->db_blkid; 2478fa9e4066Sahrens mutex_exit(&dn->dn_mtx); 2479fa9e4066Sahrens 2480fa9e4066Sahrens if (dn->dn_type == DMU_OT_DNODE) { 2481fa9e4066Sahrens dnode_phys_t *dnp = db->db.db_data; 2482fa9e4066Sahrens for (i = db->db.db_size >> DNODE_SHIFT; i > 0; 2483fa9e4066Sahrens i--, dnp++) { 2484fa9e4066Sahrens if (dnp->dn_type != DMU_OT_NONE) 2485fa9e4066Sahrens fill++; 2486fa9e4066Sahrens } 2487fa9e4066Sahrens } else { 2488c717a561Smaybee fill = 1; 2489fa9e4066Sahrens } 2490fa9e4066Sahrens } else { 2491e14bb325SJeff Bonwick blkptr_t *ibp = db->db.db_data; 2492fa9e4066Sahrens ASSERT3U(db->db.db_size, ==, 1<<dn->dn_phys->dn_indblkshift); 2493e14bb325SJeff Bonwick for (i = db->db.db_size >> SPA_BLKPTRSHIFT; i > 0; i--, ibp++) { 2494e14bb325SJeff Bonwick if (BP_IS_HOLE(ibp)) 2495fa9e4066Sahrens continue; 2496e14bb325SJeff Bonwick fill += ibp->blk_fill; 2497fa9e4066Sahrens } 2498fa9e4066Sahrens } 2499744947dcSTom Erickson DB_DNODE_EXIT(db); 2500fa9e4066Sahrens 2501e14bb325SJeff Bonwick bp->blk_fill = fill; 2502c717a561Smaybee 2503c717a561Smaybee mutex_exit(&db->db_mtx); 2504c717a561Smaybee } 2505fa9e4066Sahrens 2506c717a561Smaybee /* ARGSUSED */ 2507c717a561Smaybee static void 2508c717a561Smaybee dbuf_write_done(zio_t *zio, arc_buf_t *buf, void *vdb) 2509c717a561Smaybee { 2510c717a561Smaybee dmu_buf_impl_t *db = vdb; 2511b24ab676SJeff Bonwick blkptr_t *bp = zio->io_bp; 2512b24ab676SJeff Bonwick blkptr_t *bp_orig = &zio->io_bp_orig; 2513c717a561Smaybee uint64_t txg = zio->io_txg; 2514c717a561Smaybee dbuf_dirty_record_t **drp, *dr; 2515c717a561Smaybee 2516fb09f5aaSMadhav Suresh ASSERT0(zio->io_error); 2517b24ab676SJeff Bonwick ASSERT(db->db_blkptr == bp); 2518b24ab676SJeff Bonwick 251980901aeaSGeorge Wilson /* 252080901aeaSGeorge Wilson * For nopwrites and rewrites we ensure that the bp matches our 252180901aeaSGeorge Wilson * original and bypass all the accounting. 252280901aeaSGeorge Wilson */ 252380901aeaSGeorge Wilson if (zio->io_flags & (ZIO_FLAG_IO_REWRITE | ZIO_FLAG_NOPWRITE)) { 2524b24ab676SJeff Bonwick ASSERT(BP_EQUAL(bp, bp_orig)); 2525b24ab676SJeff Bonwick } else { 2526744947dcSTom Erickson objset_t *os; 2527744947dcSTom Erickson dsl_dataset_t *ds; 2528744947dcSTom Erickson dmu_tx_t *tx; 2529744947dcSTom Erickson 2530744947dcSTom Erickson DB_GET_OBJSET(&os, db); 2531744947dcSTom Erickson ds = os->os_dsl_dataset; 2532744947dcSTom Erickson tx = os->os_synctx; 2533b24ab676SJeff Bonwick 2534b24ab676SJeff Bonwick (void) dsl_dataset_block_kill(ds, bp_orig, tx, B_TRUE); 2535b24ab676SJeff Bonwick dsl_dataset_block_born(ds, bp, tx); 2536b24ab676SJeff Bonwick } 2537c717a561Smaybee 2538c717a561Smaybee mutex_enter(&db->db_mtx); 2539c717a561Smaybee 2540b24ab676SJeff Bonwick DBUF_VERIFY(db); 2541b24ab676SJeff Bonwick 2542c717a561Smaybee drp = &db->db_last_dirty; 254317f17c2dSbonwick while ((dr = *drp) != db->db_data_pending) 254417f17c2dSbonwick drp = &dr->dr_next; 254517f17c2dSbonwick ASSERT(!list_link_active(&dr->dr_dirty_node)); 254617f17c2dSbonwick ASSERT(dr->dr_txg == txg); 2547b24ab676SJeff Bonwick ASSERT(dr->dr_dbuf == db); 254817f17c2dSbonwick ASSERT(dr->dr_next == NULL); 254917f17c2dSbonwick *drp = dr->dr_next; 2550c717a561Smaybee 25510a586ceaSMark Shellenbaum #ifdef ZFS_DEBUG 25520a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) { 2553744947dcSTom Erickson dnode_t *dn; 2554744947dcSTom Erickson 2555744947dcSTom Erickson DB_DNODE_ENTER(db); 2556744947dcSTom Erickson dn = DB_DNODE(db); 25570a586ceaSMark Shellenbaum ASSERT(dn->dn_phys->dn_flags & DNODE_FLAG_SPILL_BLKPTR); 25580a586ceaSMark Shellenbaum ASSERT(!(BP_IS_HOLE(db->db_blkptr)) && 25590a586ceaSMark Shellenbaum db->db_blkptr == &dn->dn_phys->dn_spill); 2560744947dcSTom Erickson DB_DNODE_EXIT(db); 25610a586ceaSMark Shellenbaum } 25620a586ceaSMark Shellenbaum #endif 25630a586ceaSMark Shellenbaum 2564c717a561Smaybee if (db->db_level == 0) { 25650a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 2566c717a561Smaybee ASSERT(dr->dt.dl.dr_override_state == DR_NOT_OVERRIDDEN); 256782c9918fSTim Haley if (db->db_state != DB_NOFILL) { 256882c9918fSTim Haley if (dr->dt.dl.dr_data != db->db_buf) 256982c9918fSTim Haley VERIFY(arc_buf_remove_ref(dr->dt.dl.dr_data, 257082c9918fSTim Haley db) == 1); 2571b24ab676SJeff Bonwick else if (!arc_released(db->db_buf)) 257282c9918fSTim Haley arc_set_callback(db->db_buf, dbuf_do_evict, db); 257382c9918fSTim Haley } 2574c717a561Smaybee } else { 2575744947dcSTom Erickson dnode_t *dn; 2576744947dcSTom Erickson 2577744947dcSTom Erickson DB_DNODE_ENTER(db); 2578744947dcSTom Erickson dn = DB_DNODE(db); 2579c717a561Smaybee ASSERT(list_head(&dr->dt.di.dr_children) == NULL); 2580c717a561Smaybee ASSERT3U(db->db.db_size, ==, 1<<dn->dn_phys->dn_indblkshift); 2581c717a561Smaybee if (!BP_IS_HOLE(db->db_blkptr)) { 2582c717a561Smaybee int epbs = 2583c717a561Smaybee dn->dn_phys->dn_indblkshift - SPA_BLKPTRSHIFT; 2584c717a561Smaybee ASSERT3U(BP_GET_LSIZE(db->db_blkptr), ==, 2585c717a561Smaybee db->db.db_size); 2586c717a561Smaybee ASSERT3U(dn->dn_phys->dn_maxblkid 2587c717a561Smaybee >> (db->db_level * epbs), >=, db->db_blkid); 2588c717a561Smaybee arc_set_callback(db->db_buf, dbuf_do_evict, db); 2589c717a561Smaybee } 2590744947dcSTom Erickson DB_DNODE_EXIT(db); 2591c25056deSgw mutex_destroy(&dr->dt.di.dr_mtx); 2592c25056deSgw list_destroy(&dr->dt.di.dr_children); 2593c717a561Smaybee } 2594c717a561Smaybee kmem_free(dr, sizeof (dbuf_dirty_record_t)); 2595fa9e4066Sahrens 2596fa9e4066Sahrens cv_broadcast(&db->db_changed); 2597fa9e4066Sahrens ASSERT(db->db_dirtycnt > 0); 2598fa9e4066Sahrens db->db_dirtycnt -= 1; 2599c717a561Smaybee db->db_data_pending = NULL; 2600b24ab676SJeff Bonwick dbuf_rele_and_unlock(db, (void *)(uintptr_t)txg); 2601b24ab676SJeff Bonwick } 2602b24ab676SJeff Bonwick 2603b24ab676SJeff Bonwick static void 2604b24ab676SJeff Bonwick dbuf_write_nofill_ready(zio_t *zio) 2605b24ab676SJeff Bonwick { 2606b24ab676SJeff Bonwick dbuf_write_ready(zio, NULL, zio->io_private); 2607b24ab676SJeff Bonwick } 2608b24ab676SJeff Bonwick 2609b24ab676SJeff Bonwick static void 2610b24ab676SJeff Bonwick dbuf_write_nofill_done(zio_t *zio) 2611b24ab676SJeff Bonwick { 2612b24ab676SJeff Bonwick dbuf_write_done(zio, NULL, zio->io_private); 2613b24ab676SJeff Bonwick } 2614b24ab676SJeff Bonwick 2615b24ab676SJeff Bonwick static void 2616b24ab676SJeff Bonwick dbuf_write_override_ready(zio_t *zio) 2617b24ab676SJeff Bonwick { 2618b24ab676SJeff Bonwick dbuf_dirty_record_t *dr = zio->io_private; 2619b24ab676SJeff Bonwick dmu_buf_impl_t *db = dr->dr_dbuf; 2620b24ab676SJeff Bonwick 2621b24ab676SJeff Bonwick dbuf_write_ready(zio, NULL, db); 2622b24ab676SJeff Bonwick } 2623b24ab676SJeff Bonwick 2624b24ab676SJeff Bonwick static void 2625b24ab676SJeff Bonwick dbuf_write_override_done(zio_t *zio) 2626b24ab676SJeff Bonwick { 2627b24ab676SJeff Bonwick dbuf_dirty_record_t *dr = zio->io_private; 2628b24ab676SJeff Bonwick dmu_buf_impl_t *db = dr->dr_dbuf; 2629b24ab676SJeff Bonwick blkptr_t *obp = &dr->dt.dl.dr_overridden_by; 2630b24ab676SJeff Bonwick 2631b24ab676SJeff Bonwick mutex_enter(&db->db_mtx); 2632b24ab676SJeff Bonwick if (!BP_EQUAL(zio->io_bp, obp)) { 2633b24ab676SJeff Bonwick if (!BP_IS_HOLE(obp)) 2634b24ab676SJeff Bonwick dsl_free(spa_get_dsl(zio->io_spa), zio->io_txg, obp); 2635b24ab676SJeff Bonwick arc_release(dr->dt.dl.dr_data, db); 2636b24ab676SJeff Bonwick } 2637fa9e4066Sahrens mutex_exit(&db->db_mtx); 2638fa9e4066Sahrens 2639b24ab676SJeff Bonwick dbuf_write_done(zio, NULL, db); 2640b24ab676SJeff Bonwick } 2641b24ab676SJeff Bonwick 2642b24ab676SJeff Bonwick static void 2643b24ab676SJeff Bonwick dbuf_write(dbuf_dirty_record_t *dr, arc_buf_t *data, dmu_tx_t *tx) 2644b24ab676SJeff Bonwick { 2645b24ab676SJeff Bonwick dmu_buf_impl_t *db = dr->dr_dbuf; 2646744947dcSTom Erickson dnode_t *dn; 2647744947dcSTom Erickson objset_t *os; 2648b24ab676SJeff Bonwick dmu_buf_impl_t *parent = db->db_parent; 2649b24ab676SJeff Bonwick uint64_t txg = tx->tx_txg; 2650b24ab676SJeff Bonwick zbookmark_t zb; 2651b24ab676SJeff Bonwick zio_prop_t zp; 2652b24ab676SJeff Bonwick zio_t *zio; 26530a586ceaSMark Shellenbaum int wp_flag = 0; 2654b24ab676SJeff Bonwick 2655744947dcSTom Erickson DB_DNODE_ENTER(db); 2656744947dcSTom Erickson dn = DB_DNODE(db); 2657744947dcSTom Erickson os = dn->dn_objset; 2658744947dcSTom Erickson 2659b24ab676SJeff Bonwick if (db->db_state != DB_NOFILL) { 2660b24ab676SJeff Bonwick if (db->db_level > 0 || dn->dn_type == DMU_OT_DNODE) { 2661b24ab676SJeff Bonwick /* 2662b24ab676SJeff Bonwick * Private object buffers are released here rather 2663b24ab676SJeff Bonwick * than in dbuf_dirty() since they are only modified 2664b24ab676SJeff Bonwick * in the syncing context and we don't want the 2665b24ab676SJeff Bonwick * overhead of making multiple copies of the data. 2666b24ab676SJeff Bonwick */ 2667b24ab676SJeff Bonwick if (BP_IS_HOLE(db->db_blkptr)) { 2668b24ab676SJeff Bonwick arc_buf_thaw(data); 2669b24ab676SJeff Bonwick } else { 26703f9d6ad7SLin Ling dbuf_release_bp(db); 2671b24ab676SJeff Bonwick } 2672b24ab676SJeff Bonwick } 2673b24ab676SJeff Bonwick } 2674b24ab676SJeff Bonwick 2675b24ab676SJeff Bonwick if (parent != dn->dn_dbuf) { 2676b24ab676SJeff Bonwick ASSERT(parent && parent->db_data_pending); 2677b24ab676SJeff Bonwick ASSERT(db->db_level == parent->db_level-1); 2678b24ab676SJeff Bonwick ASSERT(arc_released(parent->db_buf)); 2679b24ab676SJeff Bonwick zio = parent->db_data_pending->dr_zio; 2680b24ab676SJeff Bonwick } else { 26810a586ceaSMark Shellenbaum ASSERT((db->db_level == dn->dn_phys->dn_nlevels-1 && 26820a586ceaSMark Shellenbaum db->db_blkid != DMU_SPILL_BLKID) || 26830a586ceaSMark Shellenbaum (db->db_blkid == DMU_SPILL_BLKID && db->db_level == 0)); 26840a586ceaSMark Shellenbaum if (db->db_blkid != DMU_SPILL_BLKID) 26850a586ceaSMark Shellenbaum ASSERT3P(db->db_blkptr, ==, 26860a586ceaSMark Shellenbaum &dn->dn_phys->dn_blkptr[db->db_blkid]); 2687b24ab676SJeff Bonwick zio = dn->dn_zio; 2688b24ab676SJeff Bonwick } 2689b24ab676SJeff Bonwick 2690b24ab676SJeff Bonwick ASSERT(db->db_level == 0 || data == db->db_buf); 2691b24ab676SJeff Bonwick ASSERT3U(db->db_blkptr->blk_birth, <=, txg); 2692b24ab676SJeff Bonwick ASSERT(zio); 2693fa9e4066Sahrens 2694b24ab676SJeff Bonwick SET_BOOKMARK(&zb, os->os_dsl_dataset ? 2695b24ab676SJeff Bonwick os->os_dsl_dataset->ds_object : DMU_META_OBJSET, 2696b24ab676SJeff Bonwick db->db.db_object, db->db_level, db->db_blkid); 2697b24ab676SJeff Bonwick 26980a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) 26990a586ceaSMark Shellenbaum wp_flag = WP_SPILL; 27000a586ceaSMark Shellenbaum wp_flag |= (db->db_state == DB_NOFILL) ? WP_NOFILL : 0; 27010a586ceaSMark Shellenbaum 27020a586ceaSMark Shellenbaum dmu_write_policy(os, dn, db->db_level, wp_flag, &zp); 2703744947dcSTom Erickson DB_DNODE_EXIT(db); 2704b24ab676SJeff Bonwick 2705b24ab676SJeff Bonwick if (db->db_level == 0 && dr->dt.dl.dr_override_state == DR_OVERRIDDEN) { 2706b24ab676SJeff Bonwick ASSERT(db->db_state != DB_NOFILL); 2707b24ab676SJeff Bonwick dr->dr_zio = zio_write(zio, os->os_spa, txg, 2708b24ab676SJeff Bonwick db->db_blkptr, data->b_data, arc_buf_size(data), &zp, 2709b24ab676SJeff Bonwick dbuf_write_override_ready, dbuf_write_override_done, dr, 2710b24ab676SJeff Bonwick ZIO_PRIORITY_ASYNC_WRITE, ZIO_FLAG_MUSTSUCCEED, &zb); 2711b24ab676SJeff Bonwick mutex_enter(&db->db_mtx); 2712b24ab676SJeff Bonwick dr->dt.dl.dr_override_state = DR_NOT_OVERRIDDEN; 2713b24ab676SJeff Bonwick zio_write_override(dr->dr_zio, &dr->dt.dl.dr_overridden_by, 271480901aeaSGeorge Wilson dr->dt.dl.dr_copies, dr->dt.dl.dr_nopwrite); 2715b24ab676SJeff Bonwick mutex_exit(&db->db_mtx); 2716b24ab676SJeff Bonwick } else if (db->db_state == DB_NOFILL) { 2717b24ab676SJeff Bonwick ASSERT(zp.zp_checksum == ZIO_CHECKSUM_OFF); 2718b24ab676SJeff Bonwick dr->dr_zio = zio_write(zio, os->os_spa, txg, 2719b24ab676SJeff Bonwick db->db_blkptr, NULL, db->db.db_size, &zp, 2720b24ab676SJeff Bonwick dbuf_write_nofill_ready, dbuf_write_nofill_done, db, 2721b24ab676SJeff Bonwick ZIO_PRIORITY_ASYNC_WRITE, 2722b24ab676SJeff Bonwick ZIO_FLAG_MUSTSUCCEED | ZIO_FLAG_NODATA, &zb); 2723b24ab676SJeff Bonwick } else { 2724b24ab676SJeff Bonwick ASSERT(arc_released(data)); 2725b24ab676SJeff Bonwick dr->dr_zio = arc_write(zio, os->os_spa, txg, 2726b24ab676SJeff Bonwick db->db_blkptr, data, DBUF_IS_L2CACHEABLE(db), &zp, 2727b24ab676SJeff Bonwick dbuf_write_ready, dbuf_write_done, db, 2728b24ab676SJeff Bonwick ZIO_PRIORITY_ASYNC_WRITE, ZIO_FLAG_MUSTSUCCEED, &zb); 2729b24ab676SJeff Bonwick } 2730fa9e4066Sahrens } 2731