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 /* 22*06e0070dSMark Shellenbaum * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 23fa9e4066Sahrens */ 24fa9e4066Sahrens 25fa9e4066Sahrens #include <sys/zfs_context.h> 26fa9e4066Sahrens #include <sys/dmu.h> 27fa9e4066Sahrens #include <sys/dmu_impl.h> 28fa9e4066Sahrens #include <sys/dbuf.h> 29fa9e4066Sahrens #include <sys/dmu_objset.h> 30fa9e4066Sahrens #include <sys/dsl_dataset.h> 31fa9e4066Sahrens #include <sys/dsl_dir.h> 32fa9e4066Sahrens #include <sys/dmu_tx.h> 33fa9e4066Sahrens #include <sys/spa.h> 34fa9e4066Sahrens #include <sys/zio.h> 35fa9e4066Sahrens #include <sys/dmu_zfetch.h> 360a586ceaSMark Shellenbaum #include <sys/sa.h> 370a586ceaSMark Shellenbaum #include <sys/sa_impl.h> 38fa9e4066Sahrens 39fa9e4066Sahrens static void dbuf_destroy(dmu_buf_impl_t *db); 40fa9e4066Sahrens static int dbuf_undirty(dmu_buf_impl_t *db, dmu_tx_t *tx); 41088f3894Sahrens static void dbuf_write(dbuf_dirty_record_t *dr, arc_buf_t *data, dmu_tx_t *tx); 42fa9e4066Sahrens 43fa9e4066Sahrens /* 44fa9e4066Sahrens * Global data structures and functions for the dbuf cache. 45fa9e4066Sahrens */ 46fa9e4066Sahrens static kmem_cache_t *dbuf_cache; 47fa9e4066Sahrens 48fa9e4066Sahrens /* ARGSUSED */ 49fa9e4066Sahrens static int 50fa9e4066Sahrens dbuf_cons(void *vdb, void *unused, int kmflag) 51fa9e4066Sahrens { 52fa9e4066Sahrens dmu_buf_impl_t *db = vdb; 53fa9e4066Sahrens bzero(db, sizeof (dmu_buf_impl_t)); 54fa9e4066Sahrens 55fa9e4066Sahrens mutex_init(&db->db_mtx, NULL, MUTEX_DEFAULT, NULL); 56fa9e4066Sahrens cv_init(&db->db_changed, NULL, CV_DEFAULT, NULL); 57fa9e4066Sahrens refcount_create(&db->db_holds); 58fa9e4066Sahrens return (0); 59fa9e4066Sahrens } 60fa9e4066Sahrens 61fa9e4066Sahrens /* ARGSUSED */ 62fa9e4066Sahrens static void 63fa9e4066Sahrens dbuf_dest(void *vdb, void *unused) 64fa9e4066Sahrens { 65fa9e4066Sahrens dmu_buf_impl_t *db = vdb; 66fa9e4066Sahrens mutex_destroy(&db->db_mtx); 67fa9e4066Sahrens cv_destroy(&db->db_changed); 68fa9e4066Sahrens refcount_destroy(&db->db_holds); 69fa9e4066Sahrens } 70fa9e4066Sahrens 71fa9e4066Sahrens /* 72fa9e4066Sahrens * dbuf hash table routines 73fa9e4066Sahrens */ 74fa9e4066Sahrens static dbuf_hash_table_t dbuf_hash_table; 75fa9e4066Sahrens 76fa9e4066Sahrens static uint64_t dbuf_hash_count; 77fa9e4066Sahrens 78fa9e4066Sahrens static uint64_t 79fa9e4066Sahrens dbuf_hash(void *os, uint64_t obj, uint8_t lvl, uint64_t blkid) 80fa9e4066Sahrens { 81fa9e4066Sahrens uintptr_t osv = (uintptr_t)os; 82fa9e4066Sahrens uint64_t crc = -1ULL; 83fa9e4066Sahrens 84fa9e4066Sahrens ASSERT(zfs_crc64_table[128] == ZFS_CRC64_POLY); 85fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (lvl)) & 0xFF]; 86fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (osv >> 6)) & 0xFF]; 87fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (obj >> 0)) & 0xFF]; 88fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (obj >> 8)) & 0xFF]; 89fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (blkid >> 0)) & 0xFF]; 90fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (blkid >> 8)) & 0xFF]; 91fa9e4066Sahrens 92fa9e4066Sahrens crc ^= (osv>>14) ^ (obj>>16) ^ (blkid>>16); 93fa9e4066Sahrens 94fa9e4066Sahrens return (crc); 95fa9e4066Sahrens } 96fa9e4066Sahrens 97fa9e4066Sahrens #define DBUF_HASH(os, obj, level, blkid) dbuf_hash(os, obj, level, blkid); 98fa9e4066Sahrens 99fa9e4066Sahrens #define DBUF_EQUAL(dbuf, os, obj, level, blkid) \ 100fa9e4066Sahrens ((dbuf)->db.db_object == (obj) && \ 101fa9e4066Sahrens (dbuf)->db_objset == (os) && \ 102fa9e4066Sahrens (dbuf)->db_level == (level) && \ 103fa9e4066Sahrens (dbuf)->db_blkid == (blkid)) 104fa9e4066Sahrens 105fa9e4066Sahrens dmu_buf_impl_t * 106fa9e4066Sahrens dbuf_find(dnode_t *dn, uint8_t level, uint64_t blkid) 107fa9e4066Sahrens { 108fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 109503ad85cSMatthew Ahrens objset_t *os = dn->dn_objset; 110fa9e4066Sahrens uint64_t obj = dn->dn_object; 111fa9e4066Sahrens uint64_t hv = DBUF_HASH(os, obj, level, blkid); 112fa9e4066Sahrens uint64_t idx = hv & h->hash_table_mask; 113fa9e4066Sahrens dmu_buf_impl_t *db; 114fa9e4066Sahrens 115fa9e4066Sahrens mutex_enter(DBUF_HASH_MUTEX(h, idx)); 116fa9e4066Sahrens for (db = h->hash_table[idx]; db != NULL; db = db->db_hash_next) { 117fa9e4066Sahrens if (DBUF_EQUAL(db, os, obj, level, blkid)) { 118fa9e4066Sahrens mutex_enter(&db->db_mtx); 119ea8dc4b6Seschrock if (db->db_state != DB_EVICTING) { 120fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 121fa9e4066Sahrens return (db); 122fa9e4066Sahrens } 123fa9e4066Sahrens mutex_exit(&db->db_mtx); 124fa9e4066Sahrens } 125fa9e4066Sahrens } 126fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 127fa9e4066Sahrens return (NULL); 128fa9e4066Sahrens } 129fa9e4066Sahrens 130fa9e4066Sahrens /* 131fa9e4066Sahrens * Insert an entry into the hash table. If there is already an element 132fa9e4066Sahrens * equal to elem in the hash table, then the already existing element 133fa9e4066Sahrens * will be returned and the new element will not be inserted. 134fa9e4066Sahrens * Otherwise returns NULL. 135fa9e4066Sahrens */ 136fa9e4066Sahrens static dmu_buf_impl_t * 137fa9e4066Sahrens dbuf_hash_insert(dmu_buf_impl_t *db) 138fa9e4066Sahrens { 139fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 140503ad85cSMatthew Ahrens objset_t *os = db->db_objset; 141fa9e4066Sahrens uint64_t obj = db->db.db_object; 142fa9e4066Sahrens int level = db->db_level; 143fa9e4066Sahrens uint64_t blkid = db->db_blkid; 144fa9e4066Sahrens uint64_t hv = DBUF_HASH(os, obj, level, blkid); 145fa9e4066Sahrens uint64_t idx = hv & h->hash_table_mask; 146fa9e4066Sahrens dmu_buf_impl_t *dbf; 147fa9e4066Sahrens 148fa9e4066Sahrens mutex_enter(DBUF_HASH_MUTEX(h, idx)); 149fa9e4066Sahrens for (dbf = h->hash_table[idx]; dbf != NULL; dbf = dbf->db_hash_next) { 150fa9e4066Sahrens if (DBUF_EQUAL(dbf, os, obj, level, blkid)) { 151fa9e4066Sahrens mutex_enter(&dbf->db_mtx); 152ea8dc4b6Seschrock if (dbf->db_state != DB_EVICTING) { 153fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 154fa9e4066Sahrens return (dbf); 155fa9e4066Sahrens } 156fa9e4066Sahrens mutex_exit(&dbf->db_mtx); 157fa9e4066Sahrens } 158fa9e4066Sahrens } 159fa9e4066Sahrens 160fa9e4066Sahrens mutex_enter(&db->db_mtx); 161fa9e4066Sahrens db->db_hash_next = h->hash_table[idx]; 162fa9e4066Sahrens h->hash_table[idx] = db; 163fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 164fa9e4066Sahrens atomic_add_64(&dbuf_hash_count, 1); 165fa9e4066Sahrens 166fa9e4066Sahrens return (NULL); 167fa9e4066Sahrens } 168fa9e4066Sahrens 169fa9e4066Sahrens /* 170fa9e4066Sahrens * Remove an entry from the hash table. This operation will 171fa9e4066Sahrens * fail if there are any existing holds on the db. 172fa9e4066Sahrens */ 173fa9e4066Sahrens static void 174fa9e4066Sahrens dbuf_hash_remove(dmu_buf_impl_t *db) 175fa9e4066Sahrens { 176fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 177fa9e4066Sahrens uint64_t hv = DBUF_HASH(db->db_objset, db->db.db_object, 178fa9e4066Sahrens db->db_level, db->db_blkid); 179fa9e4066Sahrens uint64_t idx = hv & h->hash_table_mask; 180fa9e4066Sahrens dmu_buf_impl_t *dbf, **dbp; 181fa9e4066Sahrens 182fa9e4066Sahrens /* 183fa9e4066Sahrens * We musn't hold db_mtx to maintin lock ordering: 184fa9e4066Sahrens * DBUF_HASH_MUTEX > db_mtx. 185fa9e4066Sahrens */ 186fa9e4066Sahrens ASSERT(refcount_is_zero(&db->db_holds)); 187ea8dc4b6Seschrock ASSERT(db->db_state == DB_EVICTING); 188fa9e4066Sahrens ASSERT(!MUTEX_HELD(&db->db_mtx)); 189fa9e4066Sahrens 190fa9e4066Sahrens mutex_enter(DBUF_HASH_MUTEX(h, idx)); 191fa9e4066Sahrens dbp = &h->hash_table[idx]; 192fa9e4066Sahrens while ((dbf = *dbp) != db) { 193fa9e4066Sahrens dbp = &dbf->db_hash_next; 194fa9e4066Sahrens ASSERT(dbf != NULL); 195fa9e4066Sahrens } 196fa9e4066Sahrens *dbp = db->db_hash_next; 197fa9e4066Sahrens db->db_hash_next = NULL; 198fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 199fa9e4066Sahrens atomic_add_64(&dbuf_hash_count, -1); 200fa9e4066Sahrens } 201fa9e4066Sahrens 202ea8dc4b6Seschrock static arc_evict_func_t dbuf_do_evict; 203fa9e4066Sahrens 204fa9e4066Sahrens static void 205fa9e4066Sahrens dbuf_evict_user(dmu_buf_impl_t *db) 206fa9e4066Sahrens { 207fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 208fa9e4066Sahrens 209c717a561Smaybee if (db->db_level != 0 || db->db_evict_func == NULL) 210fa9e4066Sahrens return; 211fa9e4066Sahrens 212c717a561Smaybee if (db->db_user_data_ptr_ptr) 213c717a561Smaybee *db->db_user_data_ptr_ptr = db->db.db_data; 214c717a561Smaybee db->db_evict_func(&db->db, db->db_user_ptr); 215c717a561Smaybee db->db_user_ptr = NULL; 216c717a561Smaybee db->db_user_data_ptr_ptr = NULL; 217c717a561Smaybee db->db_evict_func = NULL; 218fa9e4066Sahrens } 219fa9e4066Sahrens 220fa9e4066Sahrens void 221ea8dc4b6Seschrock dbuf_evict(dmu_buf_impl_t *db) 222ea8dc4b6Seschrock { 223ea8dc4b6Seschrock ASSERT(MUTEX_HELD(&db->db_mtx)); 224ea8dc4b6Seschrock ASSERT(db->db_buf == NULL); 225c717a561Smaybee ASSERT(db->db_data_pending == NULL); 226ea8dc4b6Seschrock 227ea8dc4b6Seschrock dbuf_clear(db); 228ea8dc4b6Seschrock dbuf_destroy(db); 229ea8dc4b6Seschrock } 230ea8dc4b6Seschrock 231ea8dc4b6Seschrock void 232fa9e4066Sahrens dbuf_init(void) 233fa9e4066Sahrens { 234ea8dc4b6Seschrock uint64_t hsize = 1ULL << 16; 235fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 236fa9e4066Sahrens int i; 237fa9e4066Sahrens 238fa9e4066Sahrens /* 239fa9e4066Sahrens * The hash table is big enough to fill all of physical memory 240ea8dc4b6Seschrock * with an average 4K block size. The table will take up 241ea8dc4b6Seschrock * totalmem*sizeof(void*)/4K (i.e. 2MB/GB with 8-byte pointers). 242fa9e4066Sahrens */ 243ea8dc4b6Seschrock while (hsize * 4096 < physmem * PAGESIZE) 244fa9e4066Sahrens hsize <<= 1; 245fa9e4066Sahrens 246ea8dc4b6Seschrock retry: 247fa9e4066Sahrens h->hash_table_mask = hsize - 1; 248ea8dc4b6Seschrock h->hash_table = kmem_zalloc(hsize * sizeof (void *), KM_NOSLEEP); 249ea8dc4b6Seschrock if (h->hash_table == NULL) { 250ea8dc4b6Seschrock /* XXX - we should really return an error instead of assert */ 251ea8dc4b6Seschrock ASSERT(hsize > (1ULL << 10)); 252ea8dc4b6Seschrock hsize >>= 1; 253ea8dc4b6Seschrock goto retry; 254ea8dc4b6Seschrock } 255fa9e4066Sahrens 256fa9e4066Sahrens dbuf_cache = kmem_cache_create("dmu_buf_impl_t", 257fa9e4066Sahrens sizeof (dmu_buf_impl_t), 258fa9e4066Sahrens 0, dbuf_cons, dbuf_dest, NULL, NULL, NULL, 0); 259fa9e4066Sahrens 260fa9e4066Sahrens for (i = 0; i < DBUF_MUTEXES; i++) 261fa9e4066Sahrens mutex_init(&h->hash_mutexes[i], NULL, MUTEX_DEFAULT, NULL); 262fa9e4066Sahrens } 263fa9e4066Sahrens 264fa9e4066Sahrens void 265fa9e4066Sahrens dbuf_fini(void) 266fa9e4066Sahrens { 267fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 268fa9e4066Sahrens int i; 269fa9e4066Sahrens 270fa9e4066Sahrens for (i = 0; i < DBUF_MUTEXES; i++) 271fa9e4066Sahrens mutex_destroy(&h->hash_mutexes[i]); 272fa9e4066Sahrens kmem_free(h->hash_table, (h->hash_table_mask + 1) * sizeof (void *)); 273fa9e4066Sahrens kmem_cache_destroy(dbuf_cache); 274fa9e4066Sahrens } 275fa9e4066Sahrens 276fa9e4066Sahrens /* 277fa9e4066Sahrens * Other stuff. 278fa9e4066Sahrens */ 279fa9e4066Sahrens 2809c9dc39aSek110237 #ifdef ZFS_DEBUG 281fa9e4066Sahrens static void 282fa9e4066Sahrens dbuf_verify(dmu_buf_impl_t *db) 283fa9e4066Sahrens { 284fa9e4066Sahrens dnode_t *dn = db->db_dnode; 285b24ab676SJeff Bonwick dbuf_dirty_record_t *dr; 286fa9e4066Sahrens 287fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 288fa9e4066Sahrens 289fa9e4066Sahrens if (!(zfs_flags & ZFS_DEBUG_DBUF_VERIFY)) 290fa9e4066Sahrens return; 291fa9e4066Sahrens 292fa9e4066Sahrens ASSERT(db->db_objset != NULL); 293fa9e4066Sahrens if (dn == NULL) { 294fa9e4066Sahrens ASSERT(db->db_parent == NULL); 295fa9e4066Sahrens ASSERT(db->db_blkptr == NULL); 296fa9e4066Sahrens } else { 297fa9e4066Sahrens ASSERT3U(db->db.db_object, ==, dn->dn_object); 298fa9e4066Sahrens ASSERT3P(db->db_objset, ==, dn->dn_objset); 299fa9e4066Sahrens ASSERT3U(db->db_level, <, dn->dn_nlevels); 3000a586ceaSMark Shellenbaum ASSERT(db->db_blkid == DMU_BONUS_BLKID || db->db_blkid == 3010a586ceaSMark Shellenbaum DMU_SPILL_BLKID || list_head(&dn->dn_dbufs)); 302fa9e4066Sahrens } 3030a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 304fa9e4066Sahrens ASSERT(dn != NULL); 3051934e92fSmaybee ASSERT3U(db->db.db_size, >=, dn->dn_bonuslen); 3060a586ceaSMark Shellenbaum ASSERT3U(db->db.db_offset, ==, DMU_BONUS_BLKID); 3070a586ceaSMark Shellenbaum } else if (db->db_blkid == DMU_SPILL_BLKID) { 3080a586ceaSMark Shellenbaum ASSERT(dn != NULL); 3090a586ceaSMark Shellenbaum ASSERT3U(db->db.db_size, >=, dn->dn_bonuslen); 3100a586ceaSMark Shellenbaum ASSERT3U(db->db.db_offset, ==, 0); 311fa9e4066Sahrens } else { 312fa9e4066Sahrens ASSERT3U(db->db.db_offset, ==, db->db_blkid * db->db.db_size); 313fa9e4066Sahrens } 314fa9e4066Sahrens 315b24ab676SJeff Bonwick for (dr = db->db_data_pending; dr != NULL; dr = dr->dr_next) 316b24ab676SJeff Bonwick ASSERT(dr->dr_dbuf == db); 317b24ab676SJeff Bonwick 318b24ab676SJeff Bonwick for (dr = db->db_last_dirty; dr != NULL; dr = dr->dr_next) 319b24ab676SJeff Bonwick ASSERT(dr->dr_dbuf == db); 320b24ab676SJeff Bonwick 32188b7b0f2SMatthew Ahrens /* 32288b7b0f2SMatthew Ahrens * We can't assert that db_size matches dn_datablksz because it 32388b7b0f2SMatthew Ahrens * can be momentarily different when another thread is doing 32488b7b0f2SMatthew Ahrens * dnode_set_blksz(). 32588b7b0f2SMatthew Ahrens */ 32688b7b0f2SMatthew Ahrens if (db->db_level == 0 && db->db.db_object == DMU_META_DNODE_OBJECT) { 327b24ab676SJeff Bonwick dr = db->db_data_pending; 328fa9e4066Sahrens /* 32988b7b0f2SMatthew Ahrens * It should only be modified in syncing context, so 33088b7b0f2SMatthew Ahrens * make sure we only have one copy of the data. 331fa9e4066Sahrens */ 332c717a561Smaybee ASSERT(dr == NULL || dr->dt.dl.dr_data == db->db_buf); 333fa9e4066Sahrens } 334fa9e4066Sahrens 335fa9e4066Sahrens /* verify db->db_blkptr */ 336fa9e4066Sahrens if (db->db_blkptr) { 337fa9e4066Sahrens if (db->db_parent == dn->dn_dbuf) { 338fa9e4066Sahrens /* db is pointed to by the dnode */ 339fa9e4066Sahrens /* ASSERT3U(db->db_blkid, <, dn->dn_nblkptr); */ 34014843421SMatthew Ahrens if (DMU_OBJECT_IS_SPECIAL(db->db.db_object)) 341fa9e4066Sahrens ASSERT(db->db_parent == NULL); 342fa9e4066Sahrens else 343fa9e4066Sahrens ASSERT(db->db_parent != NULL); 3440a586ceaSMark Shellenbaum if (db->db_blkid != DMU_SPILL_BLKID) 345fa9e4066Sahrens ASSERT3P(db->db_blkptr, ==, 346fa9e4066Sahrens &dn->dn_phys->dn_blkptr[db->db_blkid]); 347fa9e4066Sahrens } else { 348fa9e4066Sahrens /* db is pointed to by an indirect block */ 349fa9e4066Sahrens int epb = db->db_parent->db.db_size >> SPA_BLKPTRSHIFT; 350fa9e4066Sahrens ASSERT3U(db->db_parent->db_level, ==, db->db_level+1); 351fa9e4066Sahrens ASSERT3U(db->db_parent->db.db_object, ==, 352fa9e4066Sahrens db->db.db_object); 353fa9e4066Sahrens /* 354fa9e4066Sahrens * dnode_grow_indblksz() can make this fail if we don't 355fa9e4066Sahrens * have the struct_rwlock. XXX indblksz no longer 356fa9e4066Sahrens * grows. safe to do this now? 357fa9e4066Sahrens */ 358fa9e4066Sahrens if (RW_WRITE_HELD(&db->db_dnode->dn_struct_rwlock)) { 359fa9e4066Sahrens ASSERT3P(db->db_blkptr, ==, 360fa9e4066Sahrens ((blkptr_t *)db->db_parent->db.db_data + 361fa9e4066Sahrens db->db_blkid % epb)); 362fa9e4066Sahrens } 363fa9e4066Sahrens } 364fa9e4066Sahrens } 365fa9e4066Sahrens if ((db->db_blkptr == NULL || BP_IS_HOLE(db->db_blkptr)) && 3660a586ceaSMark Shellenbaum db->db.db_data && db->db_blkid != DMU_BONUS_BLKID && 367fa9e4066Sahrens db->db_state != DB_FILL && !dn->dn_free_txg) { 368fa9e4066Sahrens /* 369fa9e4066Sahrens * If the blkptr isn't set but they have nonzero data, 370fa9e4066Sahrens * it had better be dirty, otherwise we'll lose that 371fa9e4066Sahrens * data when we evict this buffer. 372fa9e4066Sahrens */ 373fa9e4066Sahrens if (db->db_dirtycnt == 0) { 374fa9e4066Sahrens uint64_t *buf = db->db.db_data; 375fa9e4066Sahrens int i; 376fa9e4066Sahrens 377fa9e4066Sahrens for (i = 0; i < db->db.db_size >> 3; i++) { 378fa9e4066Sahrens ASSERT(buf[i] == 0); 379fa9e4066Sahrens } 380fa9e4066Sahrens } 381fa9e4066Sahrens } 382fa9e4066Sahrens } 3839c9dc39aSek110237 #endif 384fa9e4066Sahrens 385fa9e4066Sahrens static void 386fa9e4066Sahrens dbuf_update_data(dmu_buf_impl_t *db) 387fa9e4066Sahrens { 388fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 389c717a561Smaybee if (db->db_level == 0 && db->db_user_data_ptr_ptr) { 390fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 391c717a561Smaybee *db->db_user_data_ptr_ptr = db->db.db_data; 392fa9e4066Sahrens } 393fa9e4066Sahrens } 394fa9e4066Sahrens 395fa9e4066Sahrens static void 396fa9e4066Sahrens dbuf_set_data(dmu_buf_impl_t *db, arc_buf_t *buf) 397fa9e4066Sahrens { 398fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 399ea8dc4b6Seschrock ASSERT(db->db_buf == NULL || !arc_has_callback(db->db_buf)); 400fa9e4066Sahrens db->db_buf = buf; 401ea8dc4b6Seschrock if (buf != NULL) { 402ea8dc4b6Seschrock ASSERT(buf->b_data != NULL); 403fa9e4066Sahrens db->db.db_data = buf->b_data; 404ea8dc4b6Seschrock if (!arc_released(buf)) 405ea8dc4b6Seschrock arc_set_callback(buf, dbuf_do_evict, db); 406fa9e4066Sahrens dbuf_update_data(db); 407ea8dc4b6Seschrock } else { 408ea8dc4b6Seschrock dbuf_evict_user(db); 409ea8dc4b6Seschrock db->db.db_data = NULL; 41082c9918fSTim Haley if (db->db_state != DB_NOFILL) 411ea8dc4b6Seschrock db->db_state = DB_UNCACHED; 412ea8dc4b6Seschrock } 413fa9e4066Sahrens } 414fa9e4066Sahrens 415c242f9a0Schunli zhang - Sun Microsystems - Irvine United States /* 416c242f9a0Schunli zhang - Sun Microsystems - Irvine United States * Loan out an arc_buf for read. Return the loaned arc_buf. 417c242f9a0Schunli zhang - Sun Microsystems - Irvine United States */ 418c242f9a0Schunli zhang - Sun Microsystems - Irvine United States arc_buf_t * 419c242f9a0Schunli zhang - Sun Microsystems - Irvine United States dbuf_loan_arcbuf(dmu_buf_impl_t *db) 420c242f9a0Schunli zhang - Sun Microsystems - Irvine United States { 421c242f9a0Schunli zhang - Sun Microsystems - Irvine United States arc_buf_t *abuf; 422c242f9a0Schunli zhang - Sun Microsystems - Irvine United States 423c242f9a0Schunli zhang - Sun Microsystems - Irvine United States mutex_enter(&db->db_mtx); 424c242f9a0Schunli zhang - Sun Microsystems - Irvine United States if (arc_released(db->db_buf) || refcount_count(&db->db_holds) > 1) { 425c242f9a0Schunli zhang - Sun Microsystems - Irvine United States int blksz = db->db.db_size; 426c242f9a0Schunli zhang - Sun Microsystems - Irvine United States mutex_exit(&db->db_mtx); 427c242f9a0Schunli zhang - Sun Microsystems - Irvine United States abuf = arc_loan_buf(db->db_dnode->dn_objset->os_spa, blksz); 428c242f9a0Schunli zhang - Sun Microsystems - Irvine United States bcopy(db->db.db_data, abuf->b_data, blksz); 429c242f9a0Schunli zhang - Sun Microsystems - Irvine United States } else { 430c242f9a0Schunli zhang - Sun Microsystems - Irvine United States abuf = db->db_buf; 431c242f9a0Schunli zhang - Sun Microsystems - Irvine United States arc_loan_inuse_buf(abuf, db); 432c242f9a0Schunli zhang - Sun Microsystems - Irvine United States dbuf_set_data(db, NULL); 433c242f9a0Schunli zhang - Sun Microsystems - Irvine United States mutex_exit(&db->db_mtx); 434c242f9a0Schunli zhang - Sun Microsystems - Irvine United States } 435c242f9a0Schunli zhang - Sun Microsystems - Irvine United States return (abuf); 436c242f9a0Schunli zhang - Sun Microsystems - Irvine United States } 437c242f9a0Schunli zhang - Sun Microsystems - Irvine United States 438fa9e4066Sahrens uint64_t 439fa9e4066Sahrens dbuf_whichblock(dnode_t *dn, uint64_t offset) 440fa9e4066Sahrens { 441fa9e4066Sahrens if (dn->dn_datablkshift) { 442fa9e4066Sahrens return (offset >> dn->dn_datablkshift); 443fa9e4066Sahrens } else { 444fa9e4066Sahrens ASSERT3U(offset, <, dn->dn_datablksz); 445fa9e4066Sahrens return (0); 446fa9e4066Sahrens } 447fa9e4066Sahrens } 448fa9e4066Sahrens 449fa9e4066Sahrens static void 450fa9e4066Sahrens dbuf_read_done(zio_t *zio, arc_buf_t *buf, void *vdb) 451fa9e4066Sahrens { 452fa9e4066Sahrens dmu_buf_impl_t *db = vdb; 453fa9e4066Sahrens 454fa9e4066Sahrens mutex_enter(&db->db_mtx); 455fa9e4066Sahrens ASSERT3U(db->db_state, ==, DB_READ); 456fa9e4066Sahrens /* 457fa9e4066Sahrens * All reads are synchronous, so we must have a hold on the dbuf 458fa9e4066Sahrens */ 459fa9e4066Sahrens ASSERT(refcount_count(&db->db_holds) > 0); 460ea8dc4b6Seschrock ASSERT(db->db_buf == NULL); 461fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 462c717a561Smaybee if (db->db_level == 0 && db->db_freed_in_flight) { 463fa9e4066Sahrens /* we were freed in flight; disregard any error */ 464fa9e4066Sahrens arc_release(buf, db); 465fa9e4066Sahrens bzero(buf->b_data, db->db.db_size); 4666b4acc8bSahrens arc_buf_freeze(buf); 467c717a561Smaybee db->db_freed_in_flight = FALSE; 468fa9e4066Sahrens dbuf_set_data(db, buf); 469fa9e4066Sahrens db->db_state = DB_CACHED; 470fa9e4066Sahrens } else if (zio == NULL || zio->io_error == 0) { 471fa9e4066Sahrens dbuf_set_data(db, buf); 472fa9e4066Sahrens db->db_state = DB_CACHED; 473fa9e4066Sahrens } else { 4740a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 475fa9e4066Sahrens ASSERT3P(db->db_buf, ==, NULL); 476ea8dc4b6Seschrock VERIFY(arc_buf_remove_ref(buf, db) == 1); 477ea8dc4b6Seschrock db->db_state = DB_UNCACHED; 478fa9e4066Sahrens } 479fa9e4066Sahrens cv_broadcast(&db->db_changed); 480fa9e4066Sahrens mutex_exit(&db->db_mtx); 481ea8dc4b6Seschrock dbuf_rele(db, NULL); 482fa9e4066Sahrens } 483fa9e4066Sahrens 484ea8dc4b6Seschrock static void 48513506d1eSmaybee dbuf_read_impl(dmu_buf_impl_t *db, zio_t *zio, uint32_t *flags) 486fa9e4066Sahrens { 487088f3894Sahrens dnode_t *dn = db->db_dnode; 488ea8dc4b6Seschrock zbookmark_t zb; 48913506d1eSmaybee uint32_t aflags = ARC_NOWAIT; 490088f3894Sahrens arc_buf_t *pbuf; 491fa9e4066Sahrens 492fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 493fa9e4066Sahrens /* We need the struct_rwlock to prevent db_blkptr from changing. */ 494088f3894Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 495ea8dc4b6Seschrock ASSERT(MUTEX_HELD(&db->db_mtx)); 496ea8dc4b6Seschrock ASSERT(db->db_state == DB_UNCACHED); 497ea8dc4b6Seschrock ASSERT(db->db_buf == NULL); 498fa9e4066Sahrens 4990a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 500cf04dda1SMark Maybee int bonuslen = MIN(dn->dn_bonuslen, dn->dn_phys->dn_bonuslen); 5011934e92fSmaybee 5021934e92fSmaybee ASSERT3U(bonuslen, <=, db->db.db_size); 503ea8dc4b6Seschrock db->db.db_data = zio_buf_alloc(DN_MAX_BONUSLEN); 5045a98e54bSBrendan Gregg - Sun Microsystems arc_space_consume(DN_MAX_BONUSLEN, ARC_SPACE_OTHER); 5051934e92fSmaybee if (bonuslen < DN_MAX_BONUSLEN) 506ea8dc4b6Seschrock bzero(db->db.db_data, DN_MAX_BONUSLEN); 507cf04dda1SMark Maybee if (bonuslen) 508cf04dda1SMark Maybee bcopy(DN_BONUS(dn->dn_phys), db->db.db_data, bonuslen); 509ea8dc4b6Seschrock dbuf_update_data(db); 510fa9e4066Sahrens db->db_state = DB_CACHED; 511fa9e4066Sahrens mutex_exit(&db->db_mtx); 512fa9e4066Sahrens return; 513fa9e4066Sahrens } 514fa9e4066Sahrens 5151c8564a7SMark Maybee /* 5161c8564a7SMark Maybee * Recheck BP_IS_HOLE() after dnode_block_freed() in case dnode_sync() 5171c8564a7SMark Maybee * processes the delete record and clears the bp while we are waiting 5181c8564a7SMark Maybee * for the dn_mtx (resulting in a "no" from block_freed). 5191c8564a7SMark Maybee */ 520088f3894Sahrens if (db->db_blkptr == NULL || BP_IS_HOLE(db->db_blkptr) || 5211c8564a7SMark Maybee (db->db_level == 0 && (dnode_block_freed(dn, db->db_blkid) || 5221c8564a7SMark Maybee BP_IS_HOLE(db->db_blkptr)))) { 523ad23a2dbSjohansen arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 524ad23a2dbSjohansen 525088f3894Sahrens dbuf_set_data(db, arc_buf_alloc(dn->dn_objset->os_spa, 526ad23a2dbSjohansen db->db.db_size, db, type)); 527fa9e4066Sahrens bzero(db->db.db_data, db->db.db_size); 528fa9e4066Sahrens db->db_state = DB_CACHED; 52913506d1eSmaybee *flags |= DB_RF_CACHED; 530fa9e4066Sahrens mutex_exit(&db->db_mtx); 531fa9e4066Sahrens return; 532fa9e4066Sahrens } 533fa9e4066Sahrens 534fa9e4066Sahrens db->db_state = DB_READ; 535fa9e4066Sahrens mutex_exit(&db->db_mtx); 536fa9e4066Sahrens 5373baa08fcSek110237 if (DBUF_IS_L2CACHEABLE(db)) 5383baa08fcSek110237 aflags |= ARC_L2CACHE; 5393baa08fcSek110237 540b24ab676SJeff Bonwick SET_BOOKMARK(&zb, db->db_objset->os_dsl_dataset ? 541b24ab676SJeff Bonwick db->db_objset->os_dsl_dataset->ds_object : DMU_META_OBJSET, 542b24ab676SJeff Bonwick db->db.db_object, db->db_level, db->db_blkid); 543ea8dc4b6Seschrock 544ea8dc4b6Seschrock dbuf_add_ref(db, NULL); 545fa9e4066Sahrens /* ZIO_FLAG_CANFAIL callers have to check the parent zio's error */ 546088f3894Sahrens 547088f3894Sahrens if (db->db_parent) 548088f3894Sahrens pbuf = db->db_parent->db_buf; 549088f3894Sahrens else 550088f3894Sahrens pbuf = db->db_objset->os_phys_buf; 551088f3894Sahrens 552088f3894Sahrens (void) arc_read(zio, dn->dn_objset->os_spa, db->db_blkptr, pbuf, 553fa9e4066Sahrens dbuf_read_done, db, ZIO_PRIORITY_SYNC_READ, 55413506d1eSmaybee (*flags & DB_RF_CANFAIL) ? ZIO_FLAG_CANFAIL : ZIO_FLAG_MUSTSUCCEED, 55513506d1eSmaybee &aflags, &zb); 55613506d1eSmaybee if (aflags & ARC_CACHED) 55713506d1eSmaybee *flags |= DB_RF_CACHED; 558fa9e4066Sahrens } 559fa9e4066Sahrens 560ea8dc4b6Seschrock int 561ea8dc4b6Seschrock dbuf_read(dmu_buf_impl_t *db, zio_t *zio, uint32_t flags) 562fa9e4066Sahrens { 563ea8dc4b6Seschrock int err = 0; 564ea8dc4b6Seschrock int havepzio = (zio != NULL); 56513506d1eSmaybee int prefetch; 566fa9e4066Sahrens 567fa9e4066Sahrens /* 568fa9e4066Sahrens * We don't have to hold the mutex to check db_state because it 569fa9e4066Sahrens * can't be freed while we have a hold on the buffer. 570fa9e4066Sahrens */ 571fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 572fa9e4066Sahrens 57382c9918fSTim Haley if (db->db_state == DB_NOFILL) 57482c9918fSTim Haley return (EIO); 57582c9918fSTim Haley 576fa9e4066Sahrens if ((flags & DB_RF_HAVESTRUCT) == 0) 577fa9e4066Sahrens rw_enter(&db->db_dnode->dn_struct_rwlock, RW_READER); 578fa9e4066Sahrens 5790a586ceaSMark Shellenbaum prefetch = db->db_level == 0 && db->db_blkid != DMU_BONUS_BLKID && 5803baa08fcSek110237 (flags & DB_RF_NOPREFETCH) == 0 && db->db_dnode != NULL && 5813baa08fcSek110237 DBUF_IS_CACHEABLE(db); 58213506d1eSmaybee 583fa9e4066Sahrens mutex_enter(&db->db_mtx); 584ea8dc4b6Seschrock if (db->db_state == DB_CACHED) { 585ea8dc4b6Seschrock mutex_exit(&db->db_mtx); 58613506d1eSmaybee if (prefetch) 58713506d1eSmaybee dmu_zfetch(&db->db_dnode->dn_zfetch, db->db.db_offset, 58813506d1eSmaybee db->db.db_size, TRUE); 589ea8dc4b6Seschrock if ((flags & DB_RF_HAVESTRUCT) == 0) 590ea8dc4b6Seschrock rw_exit(&db->db_dnode->dn_struct_rwlock); 591ea8dc4b6Seschrock } else if (db->db_state == DB_UNCACHED) { 592ea8dc4b6Seschrock if (zio == NULL) { 593ea8dc4b6Seschrock zio = zio_root(db->db_dnode->dn_objset->os_spa, 594ea8dc4b6Seschrock NULL, NULL, ZIO_FLAG_CANFAIL); 595ea8dc4b6Seschrock } 59613506d1eSmaybee dbuf_read_impl(db, zio, &flags); 59713506d1eSmaybee 598ea8dc4b6Seschrock /* dbuf_read_impl has dropped db_mtx for us */ 599ea8dc4b6Seschrock 60013506d1eSmaybee if (prefetch) 601ea8dc4b6Seschrock dmu_zfetch(&db->db_dnode->dn_zfetch, db->db.db_offset, 60213506d1eSmaybee db->db.db_size, flags & DB_RF_CACHED); 603ea8dc4b6Seschrock 604ea8dc4b6Seschrock if ((flags & DB_RF_HAVESTRUCT) == 0) 605ea8dc4b6Seschrock rw_exit(&db->db_dnode->dn_struct_rwlock); 606ea8dc4b6Seschrock 607ea8dc4b6Seschrock if (!havepzio) 608ea8dc4b6Seschrock err = zio_wait(zio); 609ea8dc4b6Seschrock } else { 61013506d1eSmaybee mutex_exit(&db->db_mtx); 61113506d1eSmaybee if (prefetch) 61213506d1eSmaybee dmu_zfetch(&db->db_dnode->dn_zfetch, db->db.db_offset, 61313506d1eSmaybee db->db.db_size, TRUE); 614ea8dc4b6Seschrock if ((flags & DB_RF_HAVESTRUCT) == 0) 615ea8dc4b6Seschrock rw_exit(&db->db_dnode->dn_struct_rwlock); 61613506d1eSmaybee 61713506d1eSmaybee mutex_enter(&db->db_mtx); 618ea8dc4b6Seschrock if ((flags & DB_RF_NEVERWAIT) == 0) { 619ea8dc4b6Seschrock while (db->db_state == DB_READ || 620ea8dc4b6Seschrock db->db_state == DB_FILL) { 621fa9e4066Sahrens ASSERT(db->db_state == DB_READ || 622fa9e4066Sahrens (flags & DB_RF_HAVESTRUCT) == 0); 623fa9e4066Sahrens cv_wait(&db->db_changed, &db->db_mtx); 624fa9e4066Sahrens } 625ea8dc4b6Seschrock if (db->db_state == DB_UNCACHED) 626ea8dc4b6Seschrock err = EIO; 627ea8dc4b6Seschrock } 628fa9e4066Sahrens mutex_exit(&db->db_mtx); 629fa9e4066Sahrens } 630fa9e4066Sahrens 631ea8dc4b6Seschrock ASSERT(err || havepzio || db->db_state == DB_CACHED); 632ea8dc4b6Seschrock return (err); 633fa9e4066Sahrens } 634fa9e4066Sahrens 635fa9e4066Sahrens static void 636fa9e4066Sahrens dbuf_noread(dmu_buf_impl_t *db) 637fa9e4066Sahrens { 638fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 6390a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 640fa9e4066Sahrens mutex_enter(&db->db_mtx); 641fa9e4066Sahrens while (db->db_state == DB_READ || db->db_state == DB_FILL) 642fa9e4066Sahrens cv_wait(&db->db_changed, &db->db_mtx); 643fa9e4066Sahrens if (db->db_state == DB_UNCACHED) { 644ad23a2dbSjohansen arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 645ad23a2dbSjohansen 646ea8dc4b6Seschrock ASSERT(db->db_buf == NULL); 647fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 648fa9e4066Sahrens dbuf_set_data(db, arc_buf_alloc(db->db_dnode->dn_objset->os_spa, 649ad23a2dbSjohansen db->db.db_size, db, type)); 650fa9e4066Sahrens db->db_state = DB_FILL; 65182c9918fSTim Haley } else if (db->db_state == DB_NOFILL) { 65282c9918fSTim Haley dbuf_set_data(db, NULL); 653fa9e4066Sahrens } else { 654fa9e4066Sahrens ASSERT3U(db->db_state, ==, DB_CACHED); 655fa9e4066Sahrens } 656fa9e4066Sahrens mutex_exit(&db->db_mtx); 657fa9e4066Sahrens } 658fa9e4066Sahrens 659fa9e4066Sahrens /* 660fa9e4066Sahrens * This is our just-in-time copy function. It makes a copy of 661fa9e4066Sahrens * buffers, that have been modified in a previous transaction 662fa9e4066Sahrens * group, before we modify them in the current active group. 663fa9e4066Sahrens * 664fa9e4066Sahrens * This function is used in two places: when we are dirtying a 665fa9e4066Sahrens * buffer for the first time in a txg, and when we are freeing 666fa9e4066Sahrens * a range in a dnode that includes this buffer. 667fa9e4066Sahrens * 668fa9e4066Sahrens * Note that when we are called from dbuf_free_range() we do 669fa9e4066Sahrens * not put a hold on the buffer, we just traverse the active 670fa9e4066Sahrens * dbuf list for the dnode. 671fa9e4066Sahrens */ 672fa9e4066Sahrens static void 673fa9e4066Sahrens dbuf_fix_old_data(dmu_buf_impl_t *db, uint64_t txg) 674fa9e4066Sahrens { 675c717a561Smaybee dbuf_dirty_record_t *dr = db->db_last_dirty; 676fa9e4066Sahrens 677fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 678fa9e4066Sahrens ASSERT(db->db.db_data != NULL); 679c717a561Smaybee ASSERT(db->db_level == 0); 680c717a561Smaybee ASSERT(db->db.db_object != DMU_META_DNODE_OBJECT); 681fa9e4066Sahrens 6824d31c452Smaybee if (dr == NULL || 6834d31c452Smaybee (dr->dt.dl.dr_data != 6840a586ceaSMark Shellenbaum ((db->db_blkid == DMU_BONUS_BLKID) ? db->db.db_data : db->db_buf))) 685fa9e4066Sahrens return; 686fa9e4066Sahrens 687fa9e4066Sahrens /* 688c717a561Smaybee * If the last dirty record for this dbuf has not yet synced 689c717a561Smaybee * and its referencing the dbuf data, either: 690c717a561Smaybee * reset the reference to point to a new copy, 691c717a561Smaybee * or (if there a no active holders) 692c717a561Smaybee * just null out the current db_data pointer. 693fa9e4066Sahrens */ 694c717a561Smaybee ASSERT(dr->dr_txg >= txg - 2); 6950a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 696c717a561Smaybee /* Note that the data bufs here are zio_bufs */ 697c717a561Smaybee dr->dt.dl.dr_data = zio_buf_alloc(DN_MAX_BONUSLEN); 6985a98e54bSBrendan Gregg - Sun Microsystems arc_space_consume(DN_MAX_BONUSLEN, ARC_SPACE_OTHER); 699c717a561Smaybee bcopy(db->db.db_data, dr->dt.dl.dr_data, DN_MAX_BONUSLEN); 700c717a561Smaybee } else if (refcount_count(&db->db_holds) > db->db_dirtycnt) { 701ea8dc4b6Seschrock int size = db->db.db_size; 702c717a561Smaybee arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 703c717a561Smaybee dr->dt.dl.dr_data = arc_buf_alloc( 704ad23a2dbSjohansen db->db_dnode->dn_objset->os_spa, size, db, type); 705c717a561Smaybee bcopy(db->db.db_data, dr->dt.dl.dr_data->b_data, size); 706fa9e4066Sahrens } else { 707ea8dc4b6Seschrock dbuf_set_data(db, NULL); 708fa9e4066Sahrens } 709fa9e4066Sahrens } 710ea8dc4b6Seschrock 711fa9e4066Sahrens void 712c717a561Smaybee dbuf_unoverride(dbuf_dirty_record_t *dr) 713fa9e4066Sahrens { 714c717a561Smaybee dmu_buf_impl_t *db = dr->dr_dbuf; 715b24ab676SJeff Bonwick blkptr_t *bp = &dr->dt.dl.dr_overridden_by; 716c717a561Smaybee uint64_t txg = dr->dr_txg; 717c5c6ffa0Smaybee 718c717a561Smaybee ASSERT(MUTEX_HELD(&db->db_mtx)); 719c717a561Smaybee ASSERT(dr->dt.dl.dr_override_state != DR_IN_DMU_SYNC); 720c717a561Smaybee ASSERT(db->db_level == 0); 721c717a561Smaybee 7220a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID || 723c717a561Smaybee dr->dt.dl.dr_override_state == DR_NOT_OVERRIDDEN) 724c717a561Smaybee return; 725c717a561Smaybee 726b24ab676SJeff Bonwick ASSERT(db->db_data_pending != dr); 727b24ab676SJeff Bonwick 728fa9e4066Sahrens /* free this block */ 729b24ab676SJeff Bonwick if (!BP_IS_HOLE(bp)) 730b24ab676SJeff Bonwick dsl_free(spa_get_dsl(db->db_dnode->dn_objset->os_spa), txg, bp); 731b24ab676SJeff Bonwick 732c717a561Smaybee dr->dt.dl.dr_override_state = DR_NOT_OVERRIDDEN; 7336b4acc8bSahrens /* 7346b4acc8bSahrens * Release the already-written buffer, so we leave it in 7356b4acc8bSahrens * a consistent dirty state. Note that all callers are 7366b4acc8bSahrens * modifying the buffer, so they will immediately do 7376b4acc8bSahrens * another (redundant) arc_release(). Therefore, leave 7386b4acc8bSahrens * the buf thawed to save the effort of freezing & 7396b4acc8bSahrens * immediately re-thawing it. 7406b4acc8bSahrens */ 741c717a561Smaybee arc_release(dr->dt.dl.dr_data, db); 742fa9e4066Sahrens } 743fa9e4066Sahrens 744cdb0ab79Smaybee /* 745cdb0ab79Smaybee * Evict (if its unreferenced) or clear (if its referenced) any level-0 746cdb0ab79Smaybee * data blocks in the free range, so that any future readers will find 747cdb0ab79Smaybee * empty blocks. Also, if we happen accross any level-1 dbufs in the 748cdb0ab79Smaybee * range that have not already been marked dirty, mark them dirty so 749cdb0ab79Smaybee * they stay in memory. 750cdb0ab79Smaybee */ 751fa9e4066Sahrens void 752cdb0ab79Smaybee dbuf_free_range(dnode_t *dn, uint64_t start, uint64_t end, dmu_tx_t *tx) 753fa9e4066Sahrens { 754fa9e4066Sahrens dmu_buf_impl_t *db, *db_next; 755fa9e4066Sahrens uint64_t txg = tx->tx_txg; 756cdb0ab79Smaybee int epbs = dn->dn_indblkshift - SPA_BLKPTRSHIFT; 757cdb0ab79Smaybee uint64_t first_l1 = start >> epbs; 758cdb0ab79Smaybee uint64_t last_l1 = end >> epbs; 759fa9e4066Sahrens 7600a586ceaSMark Shellenbaum if (end > dn->dn_maxblkid && (end != DMU_SPILL_BLKID)) { 761cdb0ab79Smaybee end = dn->dn_maxblkid; 762cdb0ab79Smaybee last_l1 = end >> epbs; 763cdb0ab79Smaybee } 764cdb0ab79Smaybee dprintf_dnode(dn, "start=%llu end=%llu\n", start, end); 765fa9e4066Sahrens mutex_enter(&dn->dn_dbufs_mtx); 766fa9e4066Sahrens for (db = list_head(&dn->dn_dbufs); db; db = db_next) { 767fa9e4066Sahrens db_next = list_next(&dn->dn_dbufs, db); 7680a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 769cdb0ab79Smaybee 770cdb0ab79Smaybee if (db->db_level == 1 && 771cdb0ab79Smaybee db->db_blkid >= first_l1 && db->db_blkid <= last_l1) { 772cdb0ab79Smaybee mutex_enter(&db->db_mtx); 773cdb0ab79Smaybee if (db->db_last_dirty && 774cdb0ab79Smaybee db->db_last_dirty->dr_txg < txg) { 775cdb0ab79Smaybee dbuf_add_ref(db, FTAG); 776cdb0ab79Smaybee mutex_exit(&db->db_mtx); 777cdb0ab79Smaybee dbuf_will_dirty(db, tx); 778cdb0ab79Smaybee dbuf_rele(db, FTAG); 779cdb0ab79Smaybee } else { 780cdb0ab79Smaybee mutex_exit(&db->db_mtx); 781cdb0ab79Smaybee } 782cdb0ab79Smaybee } 783cdb0ab79Smaybee 784ea8dc4b6Seschrock if (db->db_level != 0) 785fa9e4066Sahrens continue; 786fa9e4066Sahrens dprintf_dbuf(db, "found buf %s\n", ""); 787cdb0ab79Smaybee if (db->db_blkid < start || db->db_blkid > end) 788fa9e4066Sahrens continue; 789fa9e4066Sahrens 790fa9e4066Sahrens /* found a level 0 buffer in the range */ 791fa9e4066Sahrens if (dbuf_undirty(db, tx)) 792fa9e4066Sahrens continue; 793fa9e4066Sahrens 794fa9e4066Sahrens mutex_enter(&db->db_mtx); 795ea8dc4b6Seschrock if (db->db_state == DB_UNCACHED || 79682c9918fSTim Haley db->db_state == DB_NOFILL || 797ea8dc4b6Seschrock db->db_state == DB_EVICTING) { 798fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 799fa9e4066Sahrens mutex_exit(&db->db_mtx); 800fa9e4066Sahrens continue; 801fa9e4066Sahrens } 802c543ec06Sahrens if (db->db_state == DB_READ || db->db_state == DB_FILL) { 803c543ec06Sahrens /* will be handled in dbuf_read_done or dbuf_rele */ 804c717a561Smaybee db->db_freed_in_flight = TRUE; 805fa9e4066Sahrens mutex_exit(&db->db_mtx); 806fa9e4066Sahrens continue; 807fa9e4066Sahrens } 808ea8dc4b6Seschrock if (refcount_count(&db->db_holds) == 0) { 809ea8dc4b6Seschrock ASSERT(db->db_buf); 810ea8dc4b6Seschrock dbuf_clear(db); 811ea8dc4b6Seschrock continue; 812ea8dc4b6Seschrock } 813c717a561Smaybee /* The dbuf is referenced */ 814fa9e4066Sahrens 815c717a561Smaybee if (db->db_last_dirty != NULL) { 816c717a561Smaybee dbuf_dirty_record_t *dr = db->db_last_dirty; 817c717a561Smaybee 818c717a561Smaybee if (dr->dr_txg == txg) { 819ea8dc4b6Seschrock /* 820c717a561Smaybee * This buffer is "in-use", re-adjust the file 821c717a561Smaybee * size to reflect that this buffer may 822c717a561Smaybee * contain new data when we sync. 823ea8dc4b6Seschrock */ 824*06e0070dSMark Shellenbaum if (db->db_blkid != DMU_SPILL_BLKID && 825*06e0070dSMark Shellenbaum db->db_blkid > dn->dn_maxblkid) 82644eda4d7Smaybee dn->dn_maxblkid = db->db_blkid; 827c717a561Smaybee dbuf_unoverride(dr); 828c717a561Smaybee } else { 829c717a561Smaybee /* 830c717a561Smaybee * This dbuf is not dirty in the open context. 831c717a561Smaybee * Either uncache it (if its not referenced in 832c717a561Smaybee * the open context) or reset its contents to 833c717a561Smaybee * empty. 834c717a561Smaybee */ 835c717a561Smaybee dbuf_fix_old_data(db, txg); 83644eda4d7Smaybee } 837c717a561Smaybee } 838c717a561Smaybee /* clear the contents if its cached */ 839ea8dc4b6Seschrock if (db->db_state == DB_CACHED) { 840ea8dc4b6Seschrock ASSERT(db->db.db_data != NULL); 841fa9e4066Sahrens arc_release(db->db_buf, db); 842fa9e4066Sahrens bzero(db->db.db_data, db->db.db_size); 8436b4acc8bSahrens arc_buf_freeze(db->db_buf); 844fa9e4066Sahrens } 845ea8dc4b6Seschrock 846fa9e4066Sahrens mutex_exit(&db->db_mtx); 847fa9e4066Sahrens } 848fa9e4066Sahrens mutex_exit(&dn->dn_dbufs_mtx); 849fa9e4066Sahrens } 850fa9e4066Sahrens 851fa9e4066Sahrens static int 8521934e92fSmaybee dbuf_block_freeable(dmu_buf_impl_t *db) 853fa9e4066Sahrens { 854fa9e4066Sahrens dsl_dataset_t *ds = db->db_objset->os_dsl_dataset; 855fa9e4066Sahrens uint64_t birth_txg = 0; 856fa9e4066Sahrens 857fa9e4066Sahrens /* 858fa9e4066Sahrens * We don't need any locking to protect db_blkptr: 859c717a561Smaybee * If it's syncing, then db_last_dirty will be set 860c717a561Smaybee * so we'll ignore db_blkptr. 861fa9e4066Sahrens */ 862c717a561Smaybee ASSERT(MUTEX_HELD(&db->db_mtx)); 863c717a561Smaybee if (db->db_last_dirty) 864c717a561Smaybee birth_txg = db->db_last_dirty->dr_txg; 865fa9e4066Sahrens else if (db->db_blkptr) 866fa9e4066Sahrens birth_txg = db->db_blkptr->blk_birth; 867fa9e4066Sahrens 8681934e92fSmaybee /* If we don't exist or are in a snapshot, we can't be freed */ 869fa9e4066Sahrens if (birth_txg) 8701934e92fSmaybee return (ds == NULL || 8711934e92fSmaybee dsl_dataset_block_freeable(ds, birth_txg)); 872fa9e4066Sahrens else 8731934e92fSmaybee return (FALSE); 874fa9e4066Sahrens } 875fa9e4066Sahrens 876fa9e4066Sahrens void 877fa9e4066Sahrens dbuf_new_size(dmu_buf_impl_t *db, int size, dmu_tx_t *tx) 878fa9e4066Sahrens { 879fa9e4066Sahrens arc_buf_t *buf, *obuf; 880fa9e4066Sahrens int osize = db->db.db_size; 881ad23a2dbSjohansen arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 882fa9e4066Sahrens 8830a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 884ea8dc4b6Seschrock 885fa9e4066Sahrens /* XXX does *this* func really need the lock? */ 886fa9e4066Sahrens ASSERT(RW_WRITE_HELD(&db->db_dnode->dn_struct_rwlock)); 887fa9e4066Sahrens 888fa9e4066Sahrens /* 889fa9e4066Sahrens * This call to dbuf_will_dirty() with the dn_struct_rwlock held 890fa9e4066Sahrens * is OK, because there can be no other references to the db 891fa9e4066Sahrens * when we are changing its size, so no concurrent DB_FILL can 892fa9e4066Sahrens * be happening. 893fa9e4066Sahrens */ 894ea8dc4b6Seschrock /* 895ea8dc4b6Seschrock * XXX we should be doing a dbuf_read, checking the return 896ea8dc4b6Seschrock * value and returning that up to our callers 897ea8dc4b6Seschrock */ 898fa9e4066Sahrens dbuf_will_dirty(db, tx); 899fa9e4066Sahrens 900fa9e4066Sahrens /* create the data buffer for the new block */ 901ad23a2dbSjohansen buf = arc_buf_alloc(db->db_dnode->dn_objset->os_spa, size, db, type); 902fa9e4066Sahrens 903fa9e4066Sahrens /* copy old block data to the new block */ 904fa9e4066Sahrens obuf = db->db_buf; 905f65e61c0Sahrens bcopy(obuf->b_data, buf->b_data, MIN(osize, size)); 906fa9e4066Sahrens /* zero the remainder */ 907f65e61c0Sahrens if (size > osize) 908fa9e4066Sahrens bzero((uint8_t *)buf->b_data + osize, size - osize); 909fa9e4066Sahrens 910fa9e4066Sahrens mutex_enter(&db->db_mtx); 911fa9e4066Sahrens dbuf_set_data(db, buf); 912ea8dc4b6Seschrock VERIFY(arc_buf_remove_ref(obuf, db) == 1); 913fa9e4066Sahrens db->db.db_size = size; 914fa9e4066Sahrens 915c717a561Smaybee if (db->db_level == 0) { 916c717a561Smaybee ASSERT3U(db->db_last_dirty->dr_txg, ==, tx->tx_txg); 917c717a561Smaybee db->db_last_dirty->dt.dl.dr_data = buf; 918c717a561Smaybee } 919fa9e4066Sahrens mutex_exit(&db->db_mtx); 920fa9e4066Sahrens 921fa9e4066Sahrens dnode_willuse_space(db->db_dnode, size-osize, tx); 922fa9e4066Sahrens } 923fa9e4066Sahrens 924c717a561Smaybee dbuf_dirty_record_t * 925fa9e4066Sahrens dbuf_dirty(dmu_buf_impl_t *db, dmu_tx_t *tx) 926fa9e4066Sahrens { 927fa9e4066Sahrens dnode_t *dn = db->db_dnode; 928503ad85cSMatthew Ahrens objset_t *os = dn->dn_objset; 929c717a561Smaybee dbuf_dirty_record_t **drp, *dr; 930fa9e4066Sahrens int drop_struct_lock = FALSE; 931d3469faaSMark Maybee boolean_t do_free_accounting = B_FALSE; 932fa9e4066Sahrens int txgoff = tx->tx_txg & TXG_MASK; 933fa9e4066Sahrens 934fa9e4066Sahrens ASSERT(tx->tx_txg != 0); 935fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 9369c9dc39aSek110237 DMU_TX_DIRTY_BUF(tx, db); 937fa9e4066Sahrens 938fa9e4066Sahrens /* 939fa9e4066Sahrens * Shouldn't dirty a regular buffer in syncing context. Private 940fa9e4066Sahrens * objects may be dirtied in syncing context, but only if they 941fa9e4066Sahrens * were already pre-dirtied in open context. 942fa9e4066Sahrens */ 943c717a561Smaybee ASSERT(!dmu_tx_is_syncing(tx) || 944c717a561Smaybee BP_IS_HOLE(dn->dn_objset->os_rootbp) || 94514843421SMatthew Ahrens DMU_OBJECT_IS_SPECIAL(dn->dn_object) || 94614843421SMatthew Ahrens dn->dn_objset->os_dsl_dataset == NULL); 947fa9e4066Sahrens /* 948fa9e4066Sahrens * We make this assert for private objects as well, but after we 949fa9e4066Sahrens * check if we're already dirty. They are allowed to re-dirty 950fa9e4066Sahrens * in syncing context. 951fa9e4066Sahrens */ 952ea8dc4b6Seschrock ASSERT(dn->dn_object == DMU_META_DNODE_OBJECT || 953c717a561Smaybee dn->dn_dirtyctx == DN_UNDIRTIED || dn->dn_dirtyctx == 954fa9e4066Sahrens (dmu_tx_is_syncing(tx) ? DN_DIRTY_SYNC : DN_DIRTY_OPEN)); 955fa9e4066Sahrens 956fa9e4066Sahrens mutex_enter(&db->db_mtx); 957fa9e4066Sahrens /* 958c717a561Smaybee * XXX make this true for indirects too? The problem is that 959c717a561Smaybee * transactions created with dmu_tx_create_assigned() from 960c717a561Smaybee * syncing context don't bother holding ahead. 961fa9e4066Sahrens */ 962c717a561Smaybee ASSERT(db->db_level != 0 || 96382c9918fSTim Haley db->db_state == DB_CACHED || db->db_state == DB_FILL || 96482c9918fSTim Haley db->db_state == DB_NOFILL); 965fa9e4066Sahrens 966fa9e4066Sahrens mutex_enter(&dn->dn_mtx); 967fa9e4066Sahrens /* 968fa9e4066Sahrens * Don't set dirtyctx to SYNC if we're just modifying this as we 969fa9e4066Sahrens * initialize the objset. 970fa9e4066Sahrens */ 971fa9e4066Sahrens if (dn->dn_dirtyctx == DN_UNDIRTIED && 972c717a561Smaybee !BP_IS_HOLE(dn->dn_objset->os_rootbp)) { 973fa9e4066Sahrens dn->dn_dirtyctx = 974fa9e4066Sahrens (dmu_tx_is_syncing(tx) ? DN_DIRTY_SYNC : DN_DIRTY_OPEN); 975fa9e4066Sahrens ASSERT(dn->dn_dirtyctx_firstset == NULL); 976fa9e4066Sahrens dn->dn_dirtyctx_firstset = kmem_alloc(1, KM_SLEEP); 977fa9e4066Sahrens } 978fa9e4066Sahrens mutex_exit(&dn->dn_mtx); 979fa9e4066Sahrens 9800a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) 9810a586ceaSMark Shellenbaum dn->dn_have_spill = B_TRUE; 9820a586ceaSMark Shellenbaum 983fa9e4066Sahrens /* 984fa9e4066Sahrens * If this buffer is already dirty, we're done. 985fa9e4066Sahrens */ 986c717a561Smaybee drp = &db->db_last_dirty; 987c717a561Smaybee ASSERT(*drp == NULL || (*drp)->dr_txg <= tx->tx_txg || 988c717a561Smaybee db->db.db_object == DMU_META_DNODE_OBJECT); 9897e2186e3Sbonwick while ((dr = *drp) != NULL && dr->dr_txg > tx->tx_txg) 9907e2186e3Sbonwick drp = &dr->dr_next; 9917e2186e3Sbonwick if (dr && dr->dr_txg == tx->tx_txg) { 9920a586ceaSMark Shellenbaum if (db->db_level == 0 && db->db_blkid != DMU_BONUS_BLKID) { 993c717a561Smaybee /* 994c717a561Smaybee * If this buffer has already been written out, 995c717a561Smaybee * we now need to reset its state. 996c717a561Smaybee */ 9977e2186e3Sbonwick dbuf_unoverride(dr); 998b24ab676SJeff Bonwick if (db->db.db_object != DMU_META_DNODE_OBJECT && 999b24ab676SJeff Bonwick db->db_state != DB_NOFILL) 10006b4acc8bSahrens arc_buf_thaw(db->db_buf); 1001c717a561Smaybee } 1002fa9e4066Sahrens mutex_exit(&db->db_mtx); 10037e2186e3Sbonwick return (dr); 1004fa9e4066Sahrens } 1005fa9e4066Sahrens 1006fa9e4066Sahrens /* 1007fa9e4066Sahrens * Only valid if not already dirty. 1008fa9e4066Sahrens */ 100914843421SMatthew Ahrens ASSERT(dn->dn_object == 0 || 101014843421SMatthew Ahrens dn->dn_dirtyctx == DN_UNDIRTIED || dn->dn_dirtyctx == 1011fa9e4066Sahrens (dmu_tx_is_syncing(tx) ? DN_DIRTY_SYNC : DN_DIRTY_OPEN)); 1012fa9e4066Sahrens 1013fa9e4066Sahrens ASSERT3U(dn->dn_nlevels, >, db->db_level); 1014fa9e4066Sahrens ASSERT((dn->dn_phys->dn_nlevels == 0 && db->db_level == 0) || 1015fa9e4066Sahrens dn->dn_phys->dn_nlevels > db->db_level || 1016fa9e4066Sahrens dn->dn_next_nlevels[txgoff] > db->db_level || 1017fa9e4066Sahrens dn->dn_next_nlevels[(tx->tx_txg-1) & TXG_MASK] > db->db_level || 1018fa9e4066Sahrens dn->dn_next_nlevels[(tx->tx_txg-2) & TXG_MASK] > db->db_level); 1019fa9e4066Sahrens 1020fa9e4066Sahrens /* 1021fa9e4066Sahrens * We should only be dirtying in syncing context if it's the 102214843421SMatthew Ahrens * mos or we're initializing the os or it's a special object. 102314843421SMatthew Ahrens * However, we are allowed to dirty in syncing context provided 102414843421SMatthew Ahrens * we already dirtied it in open context. Hence we must make 102514843421SMatthew Ahrens * this assertion only if we're not already dirty. 1026fa9e4066Sahrens */ 102714843421SMatthew Ahrens ASSERT(!dmu_tx_is_syncing(tx) || DMU_OBJECT_IS_SPECIAL(dn->dn_object) || 102814843421SMatthew Ahrens os->os_dsl_dataset == NULL || BP_IS_HOLE(os->os_rootbp)); 1029fa9e4066Sahrens ASSERT(db->db.db_size != 0); 1030fa9e4066Sahrens 1031fa9e4066Sahrens dprintf_dbuf(db, "size=%llx\n", (u_longlong_t)db->db.db_size); 1032fa9e4066Sahrens 10330a586ceaSMark Shellenbaum if (db->db_blkid != DMU_BONUS_BLKID) { 10341934e92fSmaybee /* 10351934e92fSmaybee * Update the accounting. 1036d3469faaSMark Maybee * Note: we delay "free accounting" until after we drop 1037d3469faaSMark Maybee * the db_mtx. This keeps us from grabbing other locks 1038b24ab676SJeff Bonwick * (and possibly deadlocking) in bp_get_dsize() while 1039d3469faaSMark Maybee * also holding the db_mtx. 10401934e92fSmaybee */ 10411934e92fSmaybee dnode_willuse_space(dn, db->db.db_size, tx); 1042d3469faaSMark Maybee do_free_accounting = dbuf_block_freeable(db); 10431934e92fSmaybee } 10441934e92fSmaybee 1045ea8dc4b6Seschrock /* 1046ea8dc4b6Seschrock * If this buffer is dirty in an old transaction group we need 1047ea8dc4b6Seschrock * to make a copy of it so that the changes we make in this 1048ea8dc4b6Seschrock * transaction group won't leak out when we sync the older txg. 1049ea8dc4b6Seschrock */ 1050c717a561Smaybee dr = kmem_zalloc(sizeof (dbuf_dirty_record_t), KM_SLEEP); 1051c717a561Smaybee if (db->db_level == 0) { 1052c717a561Smaybee void *data_old = db->db_buf; 1053c717a561Smaybee 105482c9918fSTim Haley if (db->db_state != DB_NOFILL) { 10550a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 1056c717a561Smaybee dbuf_fix_old_data(db, tx->tx_txg); 1057c717a561Smaybee data_old = db->db.db_data; 1058c717a561Smaybee } else if (db->db.db_object != DMU_META_DNODE_OBJECT) { 1059fa9e4066Sahrens /* 106082c9918fSTim Haley * Release the data buffer from the cache so 106182c9918fSTim Haley * that we can modify it without impacting 106282c9918fSTim Haley * possible other users of this cached data 106382c9918fSTim Haley * block. Note that indirect blocks and 106482c9918fSTim Haley * private objects are not released until the 106582c9918fSTim Haley * syncing state (since they are only modified 106682c9918fSTim Haley * then). 1067fa9e4066Sahrens */ 1068fa9e4066Sahrens arc_release(db->db_buf, db); 1069fa9e4066Sahrens dbuf_fix_old_data(db, tx->tx_txg); 1070c717a561Smaybee data_old = db->db_buf; 1071fa9e4066Sahrens } 1072c717a561Smaybee ASSERT(data_old != NULL); 107382c9918fSTim Haley } 1074c717a561Smaybee dr->dt.dl.dr_data = data_old; 1075c717a561Smaybee } else { 1076c717a561Smaybee mutex_init(&dr->dt.di.dr_mtx, NULL, MUTEX_DEFAULT, NULL); 1077c717a561Smaybee list_create(&dr->dt.di.dr_children, 1078c717a561Smaybee sizeof (dbuf_dirty_record_t), 1079c717a561Smaybee offsetof(dbuf_dirty_record_t, dr_dirty_node)); 1080fa9e4066Sahrens } 1081c717a561Smaybee dr->dr_dbuf = db; 1082c717a561Smaybee dr->dr_txg = tx->tx_txg; 1083c717a561Smaybee dr->dr_next = *drp; 1084c717a561Smaybee *drp = dr; 1085fa9e4066Sahrens 1086fa9e4066Sahrens /* 1087fa9e4066Sahrens * We could have been freed_in_flight between the dbuf_noread 1088fa9e4066Sahrens * and dbuf_dirty. We win, as though the dbuf_noread() had 1089fa9e4066Sahrens * happened after the free. 1090fa9e4066Sahrens */ 10910a586ceaSMark Shellenbaum if (db->db_level == 0 && db->db_blkid != DMU_BONUS_BLKID && 10920a586ceaSMark Shellenbaum db->db_blkid != DMU_SPILL_BLKID) { 1093c717a561Smaybee mutex_enter(&dn->dn_mtx); 1094fa9e4066Sahrens dnode_clear_range(dn, db->db_blkid, 1, tx); 1095fa9e4066Sahrens mutex_exit(&dn->dn_mtx); 1096c717a561Smaybee db->db_freed_in_flight = FALSE; 1097c717a561Smaybee } 1098fa9e4066Sahrens 1099fa9e4066Sahrens /* 1100fa9e4066Sahrens * This buffer is now part of this txg 1101fa9e4066Sahrens */ 1102fa9e4066Sahrens dbuf_add_ref(db, (void *)(uintptr_t)tx->tx_txg); 1103fa9e4066Sahrens db->db_dirtycnt += 1; 1104fa9e4066Sahrens ASSERT3U(db->db_dirtycnt, <=, 3); 1105fa9e4066Sahrens 1106fa9e4066Sahrens mutex_exit(&db->db_mtx); 1107fa9e4066Sahrens 11080a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID || 11090a586ceaSMark Shellenbaum db->db_blkid == DMU_SPILL_BLKID) { 1110c717a561Smaybee mutex_enter(&dn->dn_mtx); 1111c717a561Smaybee ASSERT(!list_link_active(&dr->dr_dirty_node)); 1112c717a561Smaybee list_insert_tail(&dn->dn_dirty_records[txgoff], dr); 1113c717a561Smaybee mutex_exit(&dn->dn_mtx); 1114fa9e4066Sahrens dnode_setdirty(dn, tx); 1115c717a561Smaybee return (dr); 1116d3469faaSMark Maybee } else if (do_free_accounting) { 1117d3469faaSMark Maybee blkptr_t *bp = db->db_blkptr; 1118d3469faaSMark Maybee int64_t willfree = (bp && !BP_IS_HOLE(bp)) ? 1119b24ab676SJeff Bonwick bp_get_dsize(os->os_spa, bp) : db->db.db_size; 1120d3469faaSMark Maybee /* 1121d3469faaSMark Maybee * This is only a guess -- if the dbuf is dirty 1122d3469faaSMark Maybee * in a previous txg, we don't know how much 1123d3469faaSMark Maybee * space it will use on disk yet. We should 1124d3469faaSMark Maybee * really have the struct_rwlock to access 1125d3469faaSMark Maybee * db_blkptr, but since this is just a guess, 1126d3469faaSMark Maybee * it's OK if we get an odd answer. 1127d3469faaSMark Maybee */ 1128d3469faaSMark Maybee dnode_willuse_space(dn, -willfree, tx); 1129fa9e4066Sahrens } 1130fa9e4066Sahrens 1131fa9e4066Sahrens if (!RW_WRITE_HELD(&dn->dn_struct_rwlock)) { 1132fa9e4066Sahrens rw_enter(&dn->dn_struct_rwlock, RW_READER); 1133fa9e4066Sahrens drop_struct_lock = TRUE; 1134fa9e4066Sahrens } 1135fa9e4066Sahrens 11368346f03fSJonathan W Adams if (db->db_level == 0) { 11378346f03fSJonathan W Adams dnode_new_blkid(dn, db->db_blkid, tx, drop_struct_lock); 11388346f03fSJonathan W Adams ASSERT(dn->dn_maxblkid >= db->db_blkid); 11398346f03fSJonathan W Adams } 11408346f03fSJonathan W Adams 114144eda4d7Smaybee if (db->db_level+1 < dn->dn_nlevels) { 1142c717a561Smaybee dmu_buf_impl_t *parent = db->db_parent; 1143c717a561Smaybee dbuf_dirty_record_t *di; 1144c717a561Smaybee int parent_held = FALSE; 1145c717a561Smaybee 1146c717a561Smaybee if (db->db_parent == NULL || db->db_parent == dn->dn_dbuf) { 1147fa9e4066Sahrens int epbs = dn->dn_indblkshift - SPA_BLKPTRSHIFT; 1148c717a561Smaybee 1149fa9e4066Sahrens parent = dbuf_hold_level(dn, db->db_level+1, 1150fa9e4066Sahrens db->db_blkid >> epbs, FTAG); 1151c717a561Smaybee parent_held = TRUE; 1152c717a561Smaybee } 1153fa9e4066Sahrens if (drop_struct_lock) 1154fa9e4066Sahrens rw_exit(&dn->dn_struct_rwlock); 1155c717a561Smaybee ASSERT3U(db->db_level+1, ==, parent->db_level); 1156c717a561Smaybee di = dbuf_dirty(parent, tx); 1157c717a561Smaybee if (parent_held) 1158ea8dc4b6Seschrock dbuf_rele(parent, FTAG); 1159c717a561Smaybee 1160c717a561Smaybee mutex_enter(&db->db_mtx); 1161c717a561Smaybee /* possible race with dbuf_undirty() */ 1162c717a561Smaybee if (db->db_last_dirty == dr || 1163c717a561Smaybee dn->dn_object == DMU_META_DNODE_OBJECT) { 1164c717a561Smaybee mutex_enter(&di->dt.di.dr_mtx); 1165c717a561Smaybee ASSERT3U(di->dr_txg, ==, tx->tx_txg); 1166c717a561Smaybee ASSERT(!list_link_active(&dr->dr_dirty_node)); 1167c717a561Smaybee list_insert_tail(&di->dt.di.dr_children, dr); 1168c717a561Smaybee mutex_exit(&di->dt.di.dr_mtx); 1169c717a561Smaybee dr->dr_parent = di; 1170c717a561Smaybee } 1171c717a561Smaybee mutex_exit(&db->db_mtx); 1172fa9e4066Sahrens } else { 1173c717a561Smaybee ASSERT(db->db_level+1 == dn->dn_nlevels); 1174c717a561Smaybee ASSERT(db->db_blkid < dn->dn_nblkptr); 1175c717a561Smaybee ASSERT(db->db_parent == NULL || 1176c717a561Smaybee db->db_parent == db->db_dnode->dn_dbuf); 1177c717a561Smaybee mutex_enter(&dn->dn_mtx); 1178c717a561Smaybee ASSERT(!list_link_active(&dr->dr_dirty_node)); 1179c717a561Smaybee list_insert_tail(&dn->dn_dirty_records[txgoff], dr); 1180c717a561Smaybee mutex_exit(&dn->dn_mtx); 1181fa9e4066Sahrens if (drop_struct_lock) 1182fa9e4066Sahrens rw_exit(&dn->dn_struct_rwlock); 1183fa9e4066Sahrens } 1184fa9e4066Sahrens 1185fa9e4066Sahrens dnode_setdirty(dn, tx); 1186c717a561Smaybee return (dr); 1187fa9e4066Sahrens } 1188fa9e4066Sahrens 1189fa9e4066Sahrens static int 1190fa9e4066Sahrens dbuf_undirty(dmu_buf_impl_t *db, dmu_tx_t *tx) 1191fa9e4066Sahrens { 1192fa9e4066Sahrens dnode_t *dn = db->db_dnode; 1193c717a561Smaybee uint64_t txg = tx->tx_txg; 119417f17c2dSbonwick dbuf_dirty_record_t *dr, **drp; 1195fa9e4066Sahrens 1196c717a561Smaybee ASSERT(txg != 0); 11970a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 1198fa9e4066Sahrens 1199fa9e4066Sahrens mutex_enter(&db->db_mtx); 1200fa9e4066Sahrens /* 1201fa9e4066Sahrens * If this buffer is not dirty, we're done. 1202fa9e4066Sahrens */ 120317f17c2dSbonwick for (drp = &db->db_last_dirty; (dr = *drp) != NULL; drp = &dr->dr_next) 1204c717a561Smaybee if (dr->dr_txg <= txg) 1205c717a561Smaybee break; 1206c717a561Smaybee if (dr == NULL || dr->dr_txg < txg) { 1207fa9e4066Sahrens mutex_exit(&db->db_mtx); 1208fa9e4066Sahrens return (0); 1209fa9e4066Sahrens } 1210c717a561Smaybee ASSERT(dr->dr_txg == txg); 1211b24ab676SJeff Bonwick ASSERT(dr->dr_dbuf == db); 1212fa9e4066Sahrens 1213fa9e4066Sahrens /* 1214fa9e4066Sahrens * If this buffer is currently held, we cannot undirty 1215fa9e4066Sahrens * it, since one of the current holders may be in the 1216fa9e4066Sahrens * middle of an update. Note that users of dbuf_undirty() 1217fa9e4066Sahrens * should not place a hold on the dbuf before the call. 1218fa9e4066Sahrens */ 1219fa9e4066Sahrens if (refcount_count(&db->db_holds) > db->db_dirtycnt) { 1220fa9e4066Sahrens mutex_exit(&db->db_mtx); 122144eda4d7Smaybee /* Make sure we don't toss this buffer at sync phase */ 1222fa9e4066Sahrens mutex_enter(&dn->dn_mtx); 1223fa9e4066Sahrens dnode_clear_range(dn, db->db_blkid, 1, tx); 1224fa9e4066Sahrens mutex_exit(&dn->dn_mtx); 1225fa9e4066Sahrens return (0); 1226fa9e4066Sahrens } 1227fa9e4066Sahrens 1228fa9e4066Sahrens dprintf_dbuf(db, "size=%llx\n", (u_longlong_t)db->db.db_size); 1229fa9e4066Sahrens 1230fa9e4066Sahrens ASSERT(db->db.db_size != 0); 1231fa9e4066Sahrens 1232fa9e4066Sahrens /* XXX would be nice to fix up dn_towrite_space[] */ 1233fa9e4066Sahrens 123417f17c2dSbonwick *drp = dr->dr_next; 1235c717a561Smaybee 1236c717a561Smaybee if (dr->dr_parent) { 1237c717a561Smaybee mutex_enter(&dr->dr_parent->dt.di.dr_mtx); 1238c717a561Smaybee list_remove(&dr->dr_parent->dt.di.dr_children, dr); 1239c717a561Smaybee mutex_exit(&dr->dr_parent->dt.di.dr_mtx); 1240c717a561Smaybee } else if (db->db_level+1 == dn->dn_nlevels) { 1241cdb0ab79Smaybee ASSERT(db->db_blkptr == NULL || db->db_parent == dn->dn_dbuf); 1242fa9e4066Sahrens mutex_enter(&dn->dn_mtx); 1243c717a561Smaybee list_remove(&dn->dn_dirty_records[txg & TXG_MASK], dr); 1244fa9e4066Sahrens mutex_exit(&dn->dn_mtx); 1245c717a561Smaybee } 1246c717a561Smaybee 1247c717a561Smaybee if (db->db_level == 0) { 124882c9918fSTim Haley if (db->db_state != DB_NOFILL) { 1249c717a561Smaybee dbuf_unoverride(dr); 1250c717a561Smaybee 1251c717a561Smaybee ASSERT(db->db_buf != NULL); 1252c717a561Smaybee ASSERT(dr->dt.dl.dr_data != NULL); 1253c717a561Smaybee if (dr->dt.dl.dr_data != db->db_buf) 125482c9918fSTim Haley VERIFY(arc_buf_remove_ref(dr->dt.dl.dr_data, 125582c9918fSTim Haley db) == 1); 125682c9918fSTim Haley } 1257c717a561Smaybee } else { 1258c717a561Smaybee ASSERT(db->db_buf != NULL); 1259c717a561Smaybee ASSERT(list_head(&dr->dt.di.dr_children) == NULL); 1260c25056deSgw25295 mutex_destroy(&dr->dt.di.dr_mtx); 1261c25056deSgw25295 list_destroy(&dr->dt.di.dr_children); 1262c717a561Smaybee } 1263c717a561Smaybee kmem_free(dr, sizeof (dbuf_dirty_record_t)); 1264fa9e4066Sahrens 1265fa9e4066Sahrens ASSERT(db->db_dirtycnt > 0); 1266fa9e4066Sahrens db->db_dirtycnt -= 1; 1267fa9e4066Sahrens 1268c717a561Smaybee if (refcount_remove(&db->db_holds, (void *)(uintptr_t)txg) == 0) { 1269ea8dc4b6Seschrock arc_buf_t *buf = db->db_buf; 1270fa9e4066Sahrens 1271b24ab676SJeff Bonwick ASSERT(db->db_state == DB_NOFILL || arc_released(buf)); 1272ea8dc4b6Seschrock dbuf_set_data(db, NULL); 1273ea8dc4b6Seschrock VERIFY(arc_buf_remove_ref(buf, db) == 1); 1274fa9e4066Sahrens dbuf_evict(db); 1275fa9e4066Sahrens return (1); 1276fa9e4066Sahrens } 1277fa9e4066Sahrens 1278fa9e4066Sahrens mutex_exit(&db->db_mtx); 1279fa9e4066Sahrens return (0); 1280fa9e4066Sahrens } 1281fa9e4066Sahrens 1282fa9e4066Sahrens #pragma weak dmu_buf_will_dirty = dbuf_will_dirty 1283fa9e4066Sahrens void 1284fa9e4066Sahrens dbuf_will_dirty(dmu_buf_impl_t *db, dmu_tx_t *tx) 1285fa9e4066Sahrens { 12861ab7f2deSmaybee int rf = DB_RF_MUST_SUCCEED | DB_RF_NOPREFETCH; 1287fa9e4066Sahrens 1288fa9e4066Sahrens ASSERT(tx->tx_txg != 0); 1289fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 1290fa9e4066Sahrens 1291fa9e4066Sahrens if (RW_WRITE_HELD(&db->db_dnode->dn_struct_rwlock)) 1292fa9e4066Sahrens rf |= DB_RF_HAVESTRUCT; 1293ea8dc4b6Seschrock (void) dbuf_read(db, NULL, rf); 1294c717a561Smaybee (void) dbuf_dirty(db, tx); 1295fa9e4066Sahrens } 1296fa9e4066Sahrens 1297fa9e4066Sahrens void 129882c9918fSTim Haley dmu_buf_will_not_fill(dmu_buf_t *db_fake, dmu_tx_t *tx) 129982c9918fSTim Haley { 130082c9918fSTim Haley dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 130182c9918fSTim Haley 130282c9918fSTim Haley db->db_state = DB_NOFILL; 130382c9918fSTim Haley 130482c9918fSTim Haley dmu_buf_will_fill(db_fake, tx); 130582c9918fSTim Haley } 130682c9918fSTim Haley 130782c9918fSTim Haley void 1308ea8dc4b6Seschrock dmu_buf_will_fill(dmu_buf_t *db_fake, dmu_tx_t *tx) 1309fa9e4066Sahrens { 1310ea8dc4b6Seschrock dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 1311ea8dc4b6Seschrock 13120a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 1313fa9e4066Sahrens ASSERT(tx->tx_txg != 0); 1314fa9e4066Sahrens ASSERT(db->db_level == 0); 1315fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 1316fa9e4066Sahrens 1317ea8dc4b6Seschrock ASSERT(db->db.db_object != DMU_META_DNODE_OBJECT || 1318fa9e4066Sahrens dmu_tx_private_ok(tx)); 1319fa9e4066Sahrens 1320fa9e4066Sahrens dbuf_noread(db); 1321c717a561Smaybee (void) dbuf_dirty(db, tx); 1322fa9e4066Sahrens } 1323fa9e4066Sahrens 1324fa9e4066Sahrens #pragma weak dmu_buf_fill_done = dbuf_fill_done 1325fa9e4066Sahrens /* ARGSUSED */ 1326fa9e4066Sahrens void 1327fa9e4066Sahrens dbuf_fill_done(dmu_buf_impl_t *db, dmu_tx_t *tx) 1328fa9e4066Sahrens { 1329fa9e4066Sahrens mutex_enter(&db->db_mtx); 13309c9dc39aSek110237 DBUF_VERIFY(db); 1331fa9e4066Sahrens 1332fa9e4066Sahrens if (db->db_state == DB_FILL) { 1333c717a561Smaybee if (db->db_level == 0 && db->db_freed_in_flight) { 13340a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 1335fa9e4066Sahrens /* we were freed while filling */ 1336fa9e4066Sahrens /* XXX dbuf_undirty? */ 1337fa9e4066Sahrens bzero(db->db.db_data, db->db.db_size); 1338c717a561Smaybee db->db_freed_in_flight = FALSE; 1339fa9e4066Sahrens } 1340fa9e4066Sahrens db->db_state = DB_CACHED; 1341fa9e4066Sahrens cv_broadcast(&db->db_changed); 1342fa9e4066Sahrens } 1343fa9e4066Sahrens mutex_exit(&db->db_mtx); 1344fa9e4066Sahrens } 1345fa9e4066Sahrens 1346ea8dc4b6Seschrock /* 13472fdbea25SAleksandr Guzovskiy * Directly assign a provided arc buf to a given dbuf if it's not referenced 13482fdbea25SAleksandr Guzovskiy * by anybody except our caller. Otherwise copy arcbuf's contents to dbuf. 13492fdbea25SAleksandr Guzovskiy */ 13502fdbea25SAleksandr Guzovskiy void 13512fdbea25SAleksandr Guzovskiy dbuf_assign_arcbuf(dmu_buf_impl_t *db, arc_buf_t *buf, dmu_tx_t *tx) 13522fdbea25SAleksandr Guzovskiy { 13532fdbea25SAleksandr Guzovskiy ASSERT(!refcount_is_zero(&db->db_holds)); 13542fdbea25SAleksandr Guzovskiy ASSERT(db->db_dnode->dn_object != DMU_META_DNODE_OBJECT); 13550a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 13562fdbea25SAleksandr Guzovskiy ASSERT(db->db_level == 0); 13572fdbea25SAleksandr Guzovskiy ASSERT(DBUF_GET_BUFC_TYPE(db) == ARC_BUFC_DATA); 13582fdbea25SAleksandr Guzovskiy ASSERT(buf != NULL); 13592fdbea25SAleksandr Guzovskiy ASSERT(arc_buf_size(buf) == db->db.db_size); 13602fdbea25SAleksandr Guzovskiy ASSERT(tx->tx_txg != 0); 13612fdbea25SAleksandr Guzovskiy 13622fdbea25SAleksandr Guzovskiy arc_return_buf(buf, db); 13632fdbea25SAleksandr Guzovskiy ASSERT(arc_released(buf)); 13642fdbea25SAleksandr Guzovskiy 13652fdbea25SAleksandr Guzovskiy mutex_enter(&db->db_mtx); 13662fdbea25SAleksandr Guzovskiy 13672fdbea25SAleksandr Guzovskiy while (db->db_state == DB_READ || db->db_state == DB_FILL) 13682fdbea25SAleksandr Guzovskiy cv_wait(&db->db_changed, &db->db_mtx); 13692fdbea25SAleksandr Guzovskiy 13702fdbea25SAleksandr Guzovskiy ASSERT(db->db_state == DB_CACHED || db->db_state == DB_UNCACHED); 13712fdbea25SAleksandr Guzovskiy 13722fdbea25SAleksandr Guzovskiy if (db->db_state == DB_CACHED && 13732fdbea25SAleksandr Guzovskiy refcount_count(&db->db_holds) - 1 > db->db_dirtycnt) { 13742fdbea25SAleksandr Guzovskiy mutex_exit(&db->db_mtx); 13752fdbea25SAleksandr Guzovskiy (void) dbuf_dirty(db, tx); 13762fdbea25SAleksandr Guzovskiy bcopy(buf->b_data, db->db.db_data, db->db.db_size); 13772fdbea25SAleksandr Guzovskiy VERIFY(arc_buf_remove_ref(buf, db) == 1); 1378c242f9a0Schunli zhang - Sun Microsystems - Irvine United States xuio_stat_wbuf_copied(); 13792fdbea25SAleksandr Guzovskiy return; 13802fdbea25SAleksandr Guzovskiy } 13812fdbea25SAleksandr Guzovskiy 1382c242f9a0Schunli zhang - Sun Microsystems - Irvine United States xuio_stat_wbuf_nocopy(); 13832fdbea25SAleksandr Guzovskiy if (db->db_state == DB_CACHED) { 13842fdbea25SAleksandr Guzovskiy dbuf_dirty_record_t *dr = db->db_last_dirty; 13852fdbea25SAleksandr Guzovskiy 13862fdbea25SAleksandr Guzovskiy ASSERT(db->db_buf != NULL); 13872fdbea25SAleksandr Guzovskiy if (dr != NULL && dr->dr_txg == tx->tx_txg) { 13882fdbea25SAleksandr Guzovskiy ASSERT(dr->dt.dl.dr_data == db->db_buf); 13892fdbea25SAleksandr Guzovskiy if (!arc_released(db->db_buf)) { 13902fdbea25SAleksandr Guzovskiy ASSERT(dr->dt.dl.dr_override_state == 13912fdbea25SAleksandr Guzovskiy DR_OVERRIDDEN); 13922fdbea25SAleksandr Guzovskiy arc_release(db->db_buf, db); 13932fdbea25SAleksandr Guzovskiy } 13942fdbea25SAleksandr Guzovskiy dr->dt.dl.dr_data = buf; 13952fdbea25SAleksandr Guzovskiy VERIFY(arc_buf_remove_ref(db->db_buf, db) == 1); 13962fdbea25SAleksandr Guzovskiy } else if (dr == NULL || dr->dt.dl.dr_data != db->db_buf) { 13972fdbea25SAleksandr Guzovskiy arc_release(db->db_buf, db); 13982fdbea25SAleksandr Guzovskiy VERIFY(arc_buf_remove_ref(db->db_buf, db) == 1); 13992fdbea25SAleksandr Guzovskiy } 14002fdbea25SAleksandr Guzovskiy db->db_buf = NULL; 14012fdbea25SAleksandr Guzovskiy } 14022fdbea25SAleksandr Guzovskiy ASSERT(db->db_buf == NULL); 14032fdbea25SAleksandr Guzovskiy dbuf_set_data(db, buf); 14042fdbea25SAleksandr Guzovskiy db->db_state = DB_FILL; 14052fdbea25SAleksandr Guzovskiy mutex_exit(&db->db_mtx); 14062fdbea25SAleksandr Guzovskiy (void) dbuf_dirty(db, tx); 14072fdbea25SAleksandr Guzovskiy dbuf_fill_done(db, tx); 14082fdbea25SAleksandr Guzovskiy } 14092fdbea25SAleksandr Guzovskiy 14102fdbea25SAleksandr Guzovskiy /* 1411ea8dc4b6Seschrock * "Clear" the contents of this dbuf. This will mark the dbuf 1412ea8dc4b6Seschrock * EVICTING and clear *most* of its references. Unfortunetely, 1413ea8dc4b6Seschrock * when we are not holding the dn_dbufs_mtx, we can't clear the 1414ea8dc4b6Seschrock * entry in the dn_dbufs list. We have to wait until dbuf_destroy() 1415ea8dc4b6Seschrock * in this case. For callers from the DMU we will usually see: 1416ea8dc4b6Seschrock * dbuf_clear()->arc_buf_evict()->dbuf_do_evict()->dbuf_destroy() 1417ea8dc4b6Seschrock * For the arc callback, we will usually see: 1418ea8dc4b6Seschrock * dbuf_do_evict()->dbuf_clear();dbuf_destroy() 1419ea8dc4b6Seschrock * Sometimes, though, we will get a mix of these two: 1420ea8dc4b6Seschrock * DMU: dbuf_clear()->arc_buf_evict() 1421ea8dc4b6Seschrock * ARC: dbuf_do_evict()->dbuf_destroy() 1422ea8dc4b6Seschrock */ 1423ea8dc4b6Seschrock void 1424fa9e4066Sahrens dbuf_clear(dmu_buf_impl_t *db) 1425fa9e4066Sahrens { 1426fa9e4066Sahrens dnode_t *dn = db->db_dnode; 1427ea8dc4b6Seschrock dmu_buf_impl_t *parent = db->db_parent; 1428c543ec06Sahrens dmu_buf_impl_t *dndb = dn->dn_dbuf; 1429ea8dc4b6Seschrock int dbuf_gone = FALSE; 1430fa9e4066Sahrens 1431fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 1432fa9e4066Sahrens ASSERT(refcount_is_zero(&db->db_holds)); 1433fa9e4066Sahrens 1434ea8dc4b6Seschrock dbuf_evict_user(db); 1435ea8dc4b6Seschrock 1436fa9e4066Sahrens if (db->db_state == DB_CACHED) { 1437ea8dc4b6Seschrock ASSERT(db->db.db_data != NULL); 14380a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 1439ea8dc4b6Seschrock zio_buf_free(db->db.db_data, DN_MAX_BONUSLEN); 14405a98e54bSBrendan Gregg - Sun Microsystems arc_space_return(DN_MAX_BONUSLEN, ARC_SPACE_OTHER); 14410e8c6158Smaybee } 1442fa9e4066Sahrens db->db.db_data = NULL; 1443fa9e4066Sahrens db->db_state = DB_UNCACHED; 1444fa9e4066Sahrens } 1445fa9e4066Sahrens 144682c9918fSTim Haley ASSERT(db->db_state == DB_UNCACHED || db->db_state == DB_NOFILL); 1447fa9e4066Sahrens ASSERT(db->db_data_pending == NULL); 1448fa9e4066Sahrens 1449ea8dc4b6Seschrock db->db_state = DB_EVICTING; 1450ea8dc4b6Seschrock db->db_blkptr = NULL; 1451ea8dc4b6Seschrock 14520a586ceaSMark Shellenbaum if (db->db_blkid != DMU_BONUS_BLKID && MUTEX_HELD(&dn->dn_dbufs_mtx)) { 1453ea8dc4b6Seschrock list_remove(&dn->dn_dbufs, db); 1454ea8dc4b6Seschrock dnode_rele(dn, db); 14551934e92fSmaybee db->db_dnode = NULL; 1456ea8dc4b6Seschrock } 1457ea8dc4b6Seschrock 1458ea8dc4b6Seschrock if (db->db_buf) 1459ea8dc4b6Seschrock dbuf_gone = arc_buf_evict(db->db_buf); 1460ea8dc4b6Seschrock 1461ea8dc4b6Seschrock if (!dbuf_gone) 1462fa9e4066Sahrens mutex_exit(&db->db_mtx); 1463fa9e4066Sahrens 1464fa9e4066Sahrens /* 1465fa9e4066Sahrens * If this dbuf is referened from an indirect dbuf, 1466fa9e4066Sahrens * decrement the ref count on the indirect dbuf. 1467fa9e4066Sahrens */ 1468c543ec06Sahrens if (parent && parent != dndb) 1469ea8dc4b6Seschrock dbuf_rele(parent, db); 1470fa9e4066Sahrens } 1471fa9e4066Sahrens 1472fa9e4066Sahrens static int 1473fa9e4066Sahrens dbuf_findbp(dnode_t *dn, int level, uint64_t blkid, int fail_sparse, 1474fa9e4066Sahrens dmu_buf_impl_t **parentp, blkptr_t **bpp) 1475fa9e4066Sahrens { 1476fa9e4066Sahrens int nlevels, epbs; 1477fa9e4066Sahrens 14780b69c2f0Sahrens *parentp = NULL; 14790b69c2f0Sahrens *bpp = NULL; 14800b69c2f0Sahrens 14810a586ceaSMark Shellenbaum ASSERT(blkid != DMU_BONUS_BLKID); 14820a586ceaSMark Shellenbaum 14830a586ceaSMark Shellenbaum if (blkid == DMU_SPILL_BLKID) { 14840a586ceaSMark Shellenbaum mutex_enter(&dn->dn_mtx); 1485*06e0070dSMark Shellenbaum if (dn->dn_have_spill && 1486*06e0070dSMark Shellenbaum (dn->dn_phys->dn_flags & DNODE_FLAG_SPILL_BLKPTR)) 14870a586ceaSMark Shellenbaum *bpp = &dn->dn_phys->dn_spill; 14880a586ceaSMark Shellenbaum else 14890a586ceaSMark Shellenbaum *bpp = NULL; 14900a586ceaSMark Shellenbaum dbuf_add_ref(dn->dn_dbuf, NULL); 14910a586ceaSMark Shellenbaum *parentp = dn->dn_dbuf; 14920a586ceaSMark Shellenbaum mutex_exit(&dn->dn_mtx); 14930a586ceaSMark Shellenbaum return (0); 14940a586ceaSMark Shellenbaum } 1495ea8dc4b6Seschrock 1496fa9e4066Sahrens if (dn->dn_phys->dn_nlevels == 0) 1497fa9e4066Sahrens nlevels = 1; 1498fa9e4066Sahrens else 1499fa9e4066Sahrens nlevels = dn->dn_phys->dn_nlevels; 1500fa9e4066Sahrens 1501fa9e4066Sahrens epbs = dn->dn_indblkshift - SPA_BLKPTRSHIFT; 1502fa9e4066Sahrens 1503fa9e4066Sahrens ASSERT3U(level * epbs, <, 64); 1504fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 1505ea8dc4b6Seschrock if (level >= nlevels || 1506fa9e4066Sahrens (blkid > (dn->dn_phys->dn_maxblkid >> (level * epbs)))) { 1507fa9e4066Sahrens /* the buffer has no parent yet */ 1508fa9e4066Sahrens return (ENOENT); 1509fa9e4066Sahrens } else if (level < nlevels-1) { 1510fa9e4066Sahrens /* this block is referenced from an indirect block */ 1511fa9e4066Sahrens int err = dbuf_hold_impl(dn, level+1, 1512fa9e4066Sahrens blkid >> epbs, fail_sparse, NULL, parentp); 1513fa9e4066Sahrens if (err) 1514fa9e4066Sahrens return (err); 1515ea8dc4b6Seschrock err = dbuf_read(*parentp, NULL, 1516ea8dc4b6Seschrock (DB_RF_HAVESTRUCT | DB_RF_NOPREFETCH | DB_RF_CANFAIL)); 1517c543ec06Sahrens if (err) { 1518c543ec06Sahrens dbuf_rele(*parentp, NULL); 1519c543ec06Sahrens *parentp = NULL; 1520c543ec06Sahrens return (err); 1521c543ec06Sahrens } 1522fa9e4066Sahrens *bpp = ((blkptr_t *)(*parentp)->db.db_data) + 1523fa9e4066Sahrens (blkid & ((1ULL << epbs) - 1)); 1524c543ec06Sahrens return (0); 1525fa9e4066Sahrens } else { 1526fa9e4066Sahrens /* the block is referenced from the dnode */ 1527fa9e4066Sahrens ASSERT3U(level, ==, nlevels-1); 1528fa9e4066Sahrens ASSERT(dn->dn_phys->dn_nblkptr == 0 || 1529fa9e4066Sahrens blkid < dn->dn_phys->dn_nblkptr); 1530c543ec06Sahrens if (dn->dn_dbuf) { 1531c543ec06Sahrens dbuf_add_ref(dn->dn_dbuf, NULL); 1532fa9e4066Sahrens *parentp = dn->dn_dbuf; 1533c543ec06Sahrens } 1534fa9e4066Sahrens *bpp = &dn->dn_phys->dn_blkptr[blkid]; 1535fa9e4066Sahrens return (0); 1536fa9e4066Sahrens } 1537fa9e4066Sahrens } 1538fa9e4066Sahrens 1539fa9e4066Sahrens static dmu_buf_impl_t * 1540fa9e4066Sahrens dbuf_create(dnode_t *dn, uint8_t level, uint64_t blkid, 1541fa9e4066Sahrens dmu_buf_impl_t *parent, blkptr_t *blkptr) 1542fa9e4066Sahrens { 1543503ad85cSMatthew Ahrens objset_t *os = dn->dn_objset; 1544fa9e4066Sahrens dmu_buf_impl_t *db, *odb; 1545fa9e4066Sahrens 1546fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 1547fa9e4066Sahrens ASSERT(dn->dn_type != DMU_OT_NONE); 1548fa9e4066Sahrens 1549fa9e4066Sahrens db = kmem_cache_alloc(dbuf_cache, KM_SLEEP); 1550fa9e4066Sahrens 1551fa9e4066Sahrens db->db_objset = os; 1552fa9e4066Sahrens db->db.db_object = dn->dn_object; 1553fa9e4066Sahrens db->db_level = level; 1554fa9e4066Sahrens db->db_blkid = blkid; 1555c717a561Smaybee db->db_last_dirty = NULL; 1556ea8dc4b6Seschrock db->db_dirtycnt = 0; 1557ea8dc4b6Seschrock db->db_dnode = dn; 1558ea8dc4b6Seschrock db->db_parent = parent; 1559ea8dc4b6Seschrock db->db_blkptr = blkptr; 1560fa9e4066Sahrens 1561c717a561Smaybee db->db_user_ptr = NULL; 1562c717a561Smaybee db->db_user_data_ptr_ptr = NULL; 1563c717a561Smaybee db->db_evict_func = NULL; 1564c717a561Smaybee db->db_immediate_evict = 0; 1565c717a561Smaybee db->db_freed_in_flight = 0; 1566ea8dc4b6Seschrock 15670a586ceaSMark Shellenbaum if (blkid == DMU_BONUS_BLKID) { 1568ea8dc4b6Seschrock ASSERT3P(parent, ==, dn->dn_dbuf); 15691934e92fSmaybee db->db.db_size = DN_MAX_BONUSLEN - 15701934e92fSmaybee (dn->dn_nblkptr-1) * sizeof (blkptr_t); 15711934e92fSmaybee ASSERT3U(db->db.db_size, >=, dn->dn_bonuslen); 15720a586ceaSMark Shellenbaum db->db.db_offset = DMU_BONUS_BLKID; 1573ea8dc4b6Seschrock db->db_state = DB_UNCACHED; 1574ea8dc4b6Seschrock /* the bonus dbuf is not placed in the hash table */ 15755a98e54bSBrendan Gregg - Sun Microsystems arc_space_consume(sizeof (dmu_buf_impl_t), ARC_SPACE_OTHER); 1576ea8dc4b6Seschrock return (db); 15770a586ceaSMark Shellenbaum } else if (blkid == DMU_SPILL_BLKID) { 15780a586ceaSMark Shellenbaum db->db.db_size = (blkptr != NULL) ? 15790a586ceaSMark Shellenbaum BP_GET_LSIZE(blkptr) : SPA_MINBLOCKSIZE; 15800a586ceaSMark Shellenbaum db->db.db_offset = 0; 1581fa9e4066Sahrens } else { 1582fa9e4066Sahrens int blocksize = 1583fa9e4066Sahrens db->db_level ? 1<<dn->dn_indblkshift : dn->dn_datablksz; 1584fa9e4066Sahrens db->db.db_size = blocksize; 1585fa9e4066Sahrens db->db.db_offset = db->db_blkid * blocksize; 1586fa9e4066Sahrens } 1587fa9e4066Sahrens 1588fa9e4066Sahrens /* 1589fa9e4066Sahrens * Hold the dn_dbufs_mtx while we get the new dbuf 1590fa9e4066Sahrens * in the hash table *and* added to the dbufs list. 1591fa9e4066Sahrens * This prevents a possible deadlock with someone 1592fa9e4066Sahrens * trying to look up this dbuf before its added to the 1593fa9e4066Sahrens * dn_dbufs list. 1594fa9e4066Sahrens */ 1595fa9e4066Sahrens mutex_enter(&dn->dn_dbufs_mtx); 1596ea8dc4b6Seschrock db->db_state = DB_EVICTING; 1597fa9e4066Sahrens if ((odb = dbuf_hash_insert(db)) != NULL) { 1598fa9e4066Sahrens /* someone else inserted it first */ 1599fa9e4066Sahrens kmem_cache_free(dbuf_cache, db); 1600fa9e4066Sahrens mutex_exit(&dn->dn_dbufs_mtx); 1601fa9e4066Sahrens return (odb); 1602fa9e4066Sahrens } 1603fa9e4066Sahrens list_insert_head(&dn->dn_dbufs, db); 1604ea8dc4b6Seschrock db->db_state = DB_UNCACHED; 1605fa9e4066Sahrens mutex_exit(&dn->dn_dbufs_mtx); 16065a98e54bSBrendan Gregg - Sun Microsystems arc_space_consume(sizeof (dmu_buf_impl_t), ARC_SPACE_OTHER); 1607fa9e4066Sahrens 1608fa9e4066Sahrens if (parent && parent != dn->dn_dbuf) 1609fa9e4066Sahrens dbuf_add_ref(parent, db); 1610fa9e4066Sahrens 1611ea8dc4b6Seschrock ASSERT(dn->dn_object == DMU_META_DNODE_OBJECT || 1612ea8dc4b6Seschrock refcount_count(&dn->dn_holds) > 0); 1613fa9e4066Sahrens (void) refcount_add(&dn->dn_holds, db); 1614fa9e4066Sahrens 1615fa9e4066Sahrens dprintf_dbuf(db, "db=%p\n", db); 1616fa9e4066Sahrens 1617fa9e4066Sahrens return (db); 1618fa9e4066Sahrens } 1619fa9e4066Sahrens 1620fa9e4066Sahrens static int 1621ea8dc4b6Seschrock dbuf_do_evict(void *private) 1622fa9e4066Sahrens { 1623ea8dc4b6Seschrock arc_buf_t *buf = private; 1624ea8dc4b6Seschrock dmu_buf_impl_t *db = buf->b_private; 1625fa9e4066Sahrens 1626ea8dc4b6Seschrock if (!MUTEX_HELD(&db->db_mtx)) 1627ea8dc4b6Seschrock mutex_enter(&db->db_mtx); 1628ea8dc4b6Seschrock 1629ea8dc4b6Seschrock ASSERT(refcount_is_zero(&db->db_holds)); 1630ea8dc4b6Seschrock 1631ea8dc4b6Seschrock if (db->db_state != DB_EVICTING) { 1632ea8dc4b6Seschrock ASSERT(db->db_state == DB_CACHED); 16339c9dc39aSek110237 DBUF_VERIFY(db); 1634ea8dc4b6Seschrock db->db_buf = NULL; 1635ea8dc4b6Seschrock dbuf_evict(db); 1636ea8dc4b6Seschrock } else { 1637ea8dc4b6Seschrock mutex_exit(&db->db_mtx); 1638ea8dc4b6Seschrock dbuf_destroy(db); 1639fa9e4066Sahrens } 1640ea8dc4b6Seschrock return (0); 1641fa9e4066Sahrens } 1642fa9e4066Sahrens 1643fa9e4066Sahrens static void 1644fa9e4066Sahrens dbuf_destroy(dmu_buf_impl_t *db) 1645fa9e4066Sahrens { 1646fa9e4066Sahrens ASSERT(refcount_is_zero(&db->db_holds)); 1647fa9e4066Sahrens 16480a586ceaSMark Shellenbaum if (db->db_blkid != DMU_BONUS_BLKID) { 1649ea8dc4b6Seschrock /* 1650ea8dc4b6Seschrock * If this dbuf is still on the dn_dbufs list, 1651ea8dc4b6Seschrock * remove it from that list. 1652ea8dc4b6Seschrock */ 16531934e92fSmaybee if (db->db_dnode) { 16541934e92fSmaybee dnode_t *dn = db->db_dnode; 16551934e92fSmaybee 16561934e92fSmaybee mutex_enter(&dn->dn_dbufs_mtx); 1657ea8dc4b6Seschrock list_remove(&dn->dn_dbufs, db); 1658ea8dc4b6Seschrock mutex_exit(&dn->dn_dbufs_mtx); 1659ea8dc4b6Seschrock 1660ea8dc4b6Seschrock dnode_rele(dn, db); 16611934e92fSmaybee db->db_dnode = NULL; 1662ea8dc4b6Seschrock } 1663ea8dc4b6Seschrock dbuf_hash_remove(db); 1664ea8dc4b6Seschrock } 1665ea8dc4b6Seschrock db->db_parent = NULL; 1666ea8dc4b6Seschrock db->db_buf = NULL; 1667ea8dc4b6Seschrock 1668f82bfe17Sgw25295 ASSERT(!list_link_active(&db->db_link)); 1669fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 1670fa9e4066Sahrens ASSERT(db->db_hash_next == NULL); 1671fa9e4066Sahrens ASSERT(db->db_blkptr == NULL); 1672fa9e4066Sahrens ASSERT(db->db_data_pending == NULL); 1673fa9e4066Sahrens 1674fa9e4066Sahrens kmem_cache_free(dbuf_cache, db); 16755a98e54bSBrendan Gregg - Sun Microsystems arc_space_return(sizeof (dmu_buf_impl_t), ARC_SPACE_OTHER); 1676fa9e4066Sahrens } 1677fa9e4066Sahrens 1678fa9e4066Sahrens void 1679fa9e4066Sahrens dbuf_prefetch(dnode_t *dn, uint64_t blkid) 1680fa9e4066Sahrens { 168113506d1eSmaybee dmu_buf_impl_t *db = NULL; 1682fa9e4066Sahrens blkptr_t *bp = NULL; 1683fa9e4066Sahrens 16840a586ceaSMark Shellenbaum ASSERT(blkid != DMU_BONUS_BLKID); 1685fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 1686fa9e4066Sahrens 1687fa9e4066Sahrens if (dnode_block_freed(dn, blkid)) 1688fa9e4066Sahrens return; 1689fa9e4066Sahrens 1690fa9e4066Sahrens /* dbuf_find() returns with db_mtx held */ 1691fa9e4066Sahrens if (db = dbuf_find(dn, 0, blkid)) { 169213506d1eSmaybee if (refcount_count(&db->db_holds) > 0) { 1693fa9e4066Sahrens /* 169413506d1eSmaybee * This dbuf is active. We assume that it is 169513506d1eSmaybee * already CACHED, or else about to be either 1696fa9e4066Sahrens * read or filled. 1697fa9e4066Sahrens */ 1698fa9e4066Sahrens mutex_exit(&db->db_mtx); 1699fa9e4066Sahrens return; 1700fa9e4066Sahrens } 170113506d1eSmaybee mutex_exit(&db->db_mtx); 17020b69c2f0Sahrens db = NULL; 170313506d1eSmaybee } 1704fa9e4066Sahrens 170513506d1eSmaybee if (dbuf_findbp(dn, 0, blkid, TRUE, &db, &bp) == 0) { 1706fa9e4066Sahrens if (bp && !BP_IS_HOLE(bp)) { 1707088f3894Sahrens arc_buf_t *pbuf; 1708b24ab676SJeff Bonwick dsl_dataset_t *ds = dn->dn_objset->os_dsl_dataset; 170913506d1eSmaybee uint32_t aflags = ARC_NOWAIT | ARC_PREFETCH; 1710ea8dc4b6Seschrock zbookmark_t zb; 1711b24ab676SJeff Bonwick 1712b24ab676SJeff Bonwick SET_BOOKMARK(&zb, ds ? ds->ds_object : DMU_META_OBJSET, 1713b24ab676SJeff Bonwick dn->dn_object, 0, blkid); 1714ea8dc4b6Seschrock 1715088f3894Sahrens if (db) 1716088f3894Sahrens pbuf = db->db_buf; 1717088f3894Sahrens else 1718088f3894Sahrens pbuf = dn->dn_objset->os_phys_buf; 1719088f3894Sahrens 1720088f3894Sahrens (void) arc_read(NULL, dn->dn_objset->os_spa, 1721088f3894Sahrens bp, pbuf, NULL, NULL, ZIO_PRIORITY_ASYNC_READ, 1722fa9e4066Sahrens ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE, 172313506d1eSmaybee &aflags, &zb); 1724fa9e4066Sahrens } 172513506d1eSmaybee if (db) 172613506d1eSmaybee dbuf_rele(db, NULL); 1727fa9e4066Sahrens } 1728fa9e4066Sahrens } 1729fa9e4066Sahrens 1730fa9e4066Sahrens /* 1731fa9e4066Sahrens * Returns with db_holds incremented, and db_mtx not held. 1732fa9e4066Sahrens * Note: dn_struct_rwlock must be held. 1733fa9e4066Sahrens */ 1734fa9e4066Sahrens int 1735fa9e4066Sahrens dbuf_hold_impl(dnode_t *dn, uint8_t level, uint64_t blkid, int fail_sparse, 1736fa9e4066Sahrens void *tag, dmu_buf_impl_t **dbp) 1737fa9e4066Sahrens { 1738fa9e4066Sahrens dmu_buf_impl_t *db, *parent = NULL; 1739fa9e4066Sahrens 17400a586ceaSMark Shellenbaum ASSERT(blkid != DMU_BONUS_BLKID); 1741fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 1742fa9e4066Sahrens ASSERT3U(dn->dn_nlevels, >, level); 1743fa9e4066Sahrens 1744fa9e4066Sahrens *dbp = NULL; 1745ea8dc4b6Seschrock top: 1746fa9e4066Sahrens /* dbuf_find() returns with db_mtx held */ 1747fa9e4066Sahrens db = dbuf_find(dn, level, blkid); 1748fa9e4066Sahrens 1749fa9e4066Sahrens if (db == NULL) { 1750fa9e4066Sahrens blkptr_t *bp = NULL; 1751fa9e4066Sahrens int err; 1752fa9e4066Sahrens 1753c543ec06Sahrens ASSERT3P(parent, ==, NULL); 1754fa9e4066Sahrens err = dbuf_findbp(dn, level, blkid, fail_sparse, &parent, &bp); 1755fa9e4066Sahrens if (fail_sparse) { 1756fa9e4066Sahrens if (err == 0 && bp && BP_IS_HOLE(bp)) 1757fa9e4066Sahrens err = ENOENT; 1758fa9e4066Sahrens if (err) { 1759c543ec06Sahrens if (parent) 1760ea8dc4b6Seschrock dbuf_rele(parent, NULL); 1761fa9e4066Sahrens return (err); 1762fa9e4066Sahrens } 1763fa9e4066Sahrens } 1764ea8dc4b6Seschrock if (err && err != ENOENT) 1765ea8dc4b6Seschrock return (err); 1766fa9e4066Sahrens db = dbuf_create(dn, level, blkid, parent, bp); 1767fa9e4066Sahrens } 1768fa9e4066Sahrens 1769ea8dc4b6Seschrock if (db->db_buf && refcount_is_zero(&db->db_holds)) { 1770ea8dc4b6Seschrock arc_buf_add_ref(db->db_buf, db); 1771ea8dc4b6Seschrock if (db->db_buf->b_data == NULL) { 1772ea8dc4b6Seschrock dbuf_clear(db); 1773c543ec06Sahrens if (parent) { 1774c543ec06Sahrens dbuf_rele(parent, NULL); 1775c543ec06Sahrens parent = NULL; 1776c543ec06Sahrens } 1777ea8dc4b6Seschrock goto top; 1778ea8dc4b6Seschrock } 1779ea8dc4b6Seschrock ASSERT3P(db->db.db_data, ==, db->db_buf->b_data); 1780ea8dc4b6Seschrock } 1781ea8dc4b6Seschrock 1782ea8dc4b6Seschrock ASSERT(db->db_buf == NULL || arc_referenced(db->db_buf)); 1783ea8dc4b6Seschrock 1784fa9e4066Sahrens /* 1785c717a561Smaybee * If this buffer is currently syncing out, and we are are 1786c717a561Smaybee * still referencing it from db_data, we need to make a copy 1787c717a561Smaybee * of it in case we decide we want to dirty it again in this txg. 1788fa9e4066Sahrens */ 17890a586ceaSMark Shellenbaum if (db->db_level == 0 && db->db_blkid != DMU_BONUS_BLKID && 1790ea8dc4b6Seschrock dn->dn_object != DMU_META_DNODE_OBJECT && 1791c717a561Smaybee db->db_state == DB_CACHED && db->db_data_pending) { 1792c717a561Smaybee dbuf_dirty_record_t *dr = db->db_data_pending; 1793c717a561Smaybee 1794c717a561Smaybee if (dr->dt.dl.dr_data == db->db_buf) { 1795ad23a2dbSjohansen arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 1796fa9e4066Sahrens 1797c717a561Smaybee dbuf_set_data(db, 1798c717a561Smaybee arc_buf_alloc(db->db_dnode->dn_objset->os_spa, 1799c717a561Smaybee db->db.db_size, db, type)); 1800c717a561Smaybee bcopy(dr->dt.dl.dr_data->b_data, db->db.db_data, 1801fa9e4066Sahrens db->db.db_size); 1802fa9e4066Sahrens } 1803c717a561Smaybee } 1804fa9e4066Sahrens 1805ea8dc4b6Seschrock (void) refcount_add(&db->db_holds, tag); 1806fa9e4066Sahrens dbuf_update_data(db); 18079c9dc39aSek110237 DBUF_VERIFY(db); 1808fa9e4066Sahrens mutex_exit(&db->db_mtx); 1809fa9e4066Sahrens 1810fa9e4066Sahrens /* NOTE: we can't rele the parent until after we drop the db_mtx */ 1811c543ec06Sahrens if (parent) 1812ea8dc4b6Seschrock dbuf_rele(parent, NULL); 1813fa9e4066Sahrens 1814fa9e4066Sahrens ASSERT3P(db->db_dnode, ==, dn); 1815fa9e4066Sahrens ASSERT3U(db->db_blkid, ==, blkid); 1816fa9e4066Sahrens ASSERT3U(db->db_level, ==, level); 1817fa9e4066Sahrens *dbp = db; 1818fa9e4066Sahrens 1819fa9e4066Sahrens return (0); 1820fa9e4066Sahrens } 1821fa9e4066Sahrens 1822fa9e4066Sahrens dmu_buf_impl_t * 1823ea8dc4b6Seschrock dbuf_hold(dnode_t *dn, uint64_t blkid, void *tag) 1824fa9e4066Sahrens { 1825fa9e4066Sahrens dmu_buf_impl_t *db; 1826ea8dc4b6Seschrock int err = dbuf_hold_impl(dn, 0, blkid, FALSE, tag, &db); 1827ea8dc4b6Seschrock return (err ? NULL : db); 1828fa9e4066Sahrens } 1829fa9e4066Sahrens 1830fa9e4066Sahrens dmu_buf_impl_t * 1831fa9e4066Sahrens dbuf_hold_level(dnode_t *dn, int level, uint64_t blkid, void *tag) 1832fa9e4066Sahrens { 1833fa9e4066Sahrens dmu_buf_impl_t *db; 1834ea8dc4b6Seschrock int err = dbuf_hold_impl(dn, level, blkid, FALSE, tag, &db); 1835ea8dc4b6Seschrock return (err ? NULL : db); 1836fa9e4066Sahrens } 1837fa9e4066Sahrens 18381934e92fSmaybee void 1839ea8dc4b6Seschrock dbuf_create_bonus(dnode_t *dn) 1840fa9e4066Sahrens { 1841ea8dc4b6Seschrock ASSERT(RW_WRITE_HELD(&dn->dn_struct_rwlock)); 1842ea8dc4b6Seschrock 1843ea8dc4b6Seschrock ASSERT(dn->dn_bonus == NULL); 18440a586ceaSMark Shellenbaum dn->dn_bonus = dbuf_create(dn, 0, DMU_BONUS_BLKID, dn->dn_dbuf, NULL); 18450a586ceaSMark Shellenbaum } 18460a586ceaSMark Shellenbaum 18470a586ceaSMark Shellenbaum int 18480a586ceaSMark Shellenbaum dbuf_spill_set_blksz(dmu_buf_t *db_fake, uint64_t blksz, dmu_tx_t *tx) 18490a586ceaSMark Shellenbaum { 18500a586ceaSMark Shellenbaum dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 18510a586ceaSMark Shellenbaum if (db->db_blkid != DMU_SPILL_BLKID) 18520a586ceaSMark Shellenbaum return (ENOTSUP); 18530a586ceaSMark Shellenbaum if (blksz == 0) 18540a586ceaSMark Shellenbaum blksz = SPA_MINBLOCKSIZE; 18550a586ceaSMark Shellenbaum if (blksz > SPA_MAXBLOCKSIZE) 18560a586ceaSMark Shellenbaum blksz = SPA_MAXBLOCKSIZE; 18570a586ceaSMark Shellenbaum else 18580a586ceaSMark Shellenbaum blksz = P2ROUNDUP(blksz, SPA_MINBLOCKSIZE); 18590a586ceaSMark Shellenbaum 18600a586ceaSMark Shellenbaum rw_enter(&db->db_dnode->dn_struct_rwlock, RW_WRITER); 18610a586ceaSMark Shellenbaum dbuf_new_size(db, blksz, tx); 18620a586ceaSMark Shellenbaum rw_exit(&db->db_dnode->dn_struct_rwlock); 18630a586ceaSMark Shellenbaum 18640a586ceaSMark Shellenbaum return (0); 18650a586ceaSMark Shellenbaum } 18660a586ceaSMark Shellenbaum 18670a586ceaSMark Shellenbaum void 18680a586ceaSMark Shellenbaum dbuf_rm_spill(dnode_t *dn, dmu_tx_t *tx) 18690a586ceaSMark Shellenbaum { 18700a586ceaSMark Shellenbaum dbuf_free_range(dn, DMU_SPILL_BLKID, DMU_SPILL_BLKID, tx); 1871fa9e4066Sahrens } 1872fa9e4066Sahrens 1873ea8dc4b6Seschrock #pragma weak dmu_buf_add_ref = dbuf_add_ref 1874fa9e4066Sahrens void 1875fa9e4066Sahrens dbuf_add_ref(dmu_buf_impl_t *db, void *tag) 1876fa9e4066Sahrens { 1877ea8dc4b6Seschrock int64_t holds = refcount_add(&db->db_holds, tag); 1878ea8dc4b6Seschrock ASSERT(holds > 1); 1879fa9e4066Sahrens } 1880fa9e4066Sahrens 1881ea8dc4b6Seschrock #pragma weak dmu_buf_rele = dbuf_rele 1882fa9e4066Sahrens void 1883ea8dc4b6Seschrock dbuf_rele(dmu_buf_impl_t *db, void *tag) 1884fa9e4066Sahrens { 1885b24ab676SJeff Bonwick mutex_enter(&db->db_mtx); 1886b24ab676SJeff Bonwick dbuf_rele_and_unlock(db, tag); 1887b24ab676SJeff Bonwick } 1888b24ab676SJeff Bonwick 1889b24ab676SJeff Bonwick /* 1890b24ab676SJeff Bonwick * dbuf_rele() for an already-locked dbuf. This is necessary to allow 1891b24ab676SJeff Bonwick * db_dirtycnt and db_holds to be updated atomically. 1892b24ab676SJeff Bonwick */ 1893b24ab676SJeff Bonwick void 1894b24ab676SJeff Bonwick dbuf_rele_and_unlock(dmu_buf_impl_t *db, void *tag) 1895b24ab676SJeff Bonwick { 1896fa9e4066Sahrens int64_t holds; 1897fa9e4066Sahrens 1898b24ab676SJeff Bonwick ASSERT(MUTEX_HELD(&db->db_mtx)); 18999c9dc39aSek110237 DBUF_VERIFY(db); 1900fa9e4066Sahrens 1901fa9e4066Sahrens holds = refcount_remove(&db->db_holds, tag); 1902ea8dc4b6Seschrock ASSERT(holds >= 0); 1903fa9e4066Sahrens 1904c717a561Smaybee /* 1905c717a561Smaybee * We can't freeze indirects if there is a possibility that they 1906c717a561Smaybee * may be modified in the current syncing context. 1907c717a561Smaybee */ 1908c717a561Smaybee if (db->db_buf && holds == (db->db_level == 0 ? db->db_dirtycnt : 0)) 19096b4acc8bSahrens arc_buf_freeze(db->db_buf); 19106b4acc8bSahrens 1911fa9e4066Sahrens if (holds == db->db_dirtycnt && 1912c717a561Smaybee db->db_level == 0 && db->db_immediate_evict) 1913fa9e4066Sahrens dbuf_evict_user(db); 1914ea8dc4b6Seschrock 1915ea8dc4b6Seschrock if (holds == 0) { 19160a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 1917ea8dc4b6Seschrock mutex_exit(&db->db_mtx); 1918ea8dc4b6Seschrock dnode_rele(db->db_dnode, db); 1919ea8dc4b6Seschrock } else if (db->db_buf == NULL) { 1920ea8dc4b6Seschrock /* 1921ea8dc4b6Seschrock * This is a special case: we never associated this 1922ea8dc4b6Seschrock * dbuf with any data allocated from the ARC. 1923ea8dc4b6Seschrock */ 192482c9918fSTim Haley ASSERT(db->db_state == DB_UNCACHED || 192582c9918fSTim Haley db->db_state == DB_NOFILL); 1926ea8dc4b6Seschrock dbuf_evict(db); 1927ea8dc4b6Seschrock } else if (arc_released(db->db_buf)) { 1928ea8dc4b6Seschrock arc_buf_t *buf = db->db_buf; 1929ea8dc4b6Seschrock /* 1930ea8dc4b6Seschrock * This dbuf has anonymous data associated with it. 1931ea8dc4b6Seschrock */ 1932ea8dc4b6Seschrock dbuf_set_data(db, NULL); 1933ea8dc4b6Seschrock VERIFY(arc_buf_remove_ref(buf, db) == 1); 1934ea8dc4b6Seschrock dbuf_evict(db); 1935ea8dc4b6Seschrock } else { 1936ea8dc4b6Seschrock VERIFY(arc_buf_remove_ref(db->db_buf, db) == 0); 19373baa08fcSek110237 if (!DBUF_IS_CACHEABLE(db)) 19383baa08fcSek110237 dbuf_clear(db); 19393baa08fcSek110237 else 1940fa9e4066Sahrens mutex_exit(&db->db_mtx); 1941fa9e4066Sahrens } 1942ea8dc4b6Seschrock } else { 1943ea8dc4b6Seschrock mutex_exit(&db->db_mtx); 1944fa9e4066Sahrens } 1945fa9e4066Sahrens } 1946fa9e4066Sahrens 1947fa9e4066Sahrens #pragma weak dmu_buf_refcount = dbuf_refcount 1948fa9e4066Sahrens uint64_t 1949fa9e4066Sahrens dbuf_refcount(dmu_buf_impl_t *db) 1950fa9e4066Sahrens { 1951fa9e4066Sahrens return (refcount_count(&db->db_holds)); 1952fa9e4066Sahrens } 1953fa9e4066Sahrens 1954fa9e4066Sahrens void * 1955fa9e4066Sahrens dmu_buf_set_user(dmu_buf_t *db_fake, void *user_ptr, void *user_data_ptr_ptr, 1956fa9e4066Sahrens dmu_buf_evict_func_t *evict_func) 1957fa9e4066Sahrens { 1958fa9e4066Sahrens return (dmu_buf_update_user(db_fake, NULL, user_ptr, 1959fa9e4066Sahrens user_data_ptr_ptr, evict_func)); 1960fa9e4066Sahrens } 1961fa9e4066Sahrens 1962fa9e4066Sahrens void * 1963fa9e4066Sahrens dmu_buf_set_user_ie(dmu_buf_t *db_fake, void *user_ptr, void *user_data_ptr_ptr, 1964fa9e4066Sahrens dmu_buf_evict_func_t *evict_func) 1965fa9e4066Sahrens { 1966fa9e4066Sahrens dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 1967fa9e4066Sahrens 1968c717a561Smaybee db->db_immediate_evict = TRUE; 1969fa9e4066Sahrens return (dmu_buf_update_user(db_fake, NULL, user_ptr, 1970fa9e4066Sahrens user_data_ptr_ptr, evict_func)); 1971fa9e4066Sahrens } 1972fa9e4066Sahrens 1973fa9e4066Sahrens void * 1974fa9e4066Sahrens dmu_buf_update_user(dmu_buf_t *db_fake, void *old_user_ptr, void *user_ptr, 1975fa9e4066Sahrens void *user_data_ptr_ptr, dmu_buf_evict_func_t *evict_func) 1976fa9e4066Sahrens { 1977fa9e4066Sahrens dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 1978fa9e4066Sahrens ASSERT(db->db_level == 0); 1979fa9e4066Sahrens 1980fa9e4066Sahrens ASSERT((user_ptr == NULL) == (evict_func == NULL)); 1981fa9e4066Sahrens 1982fa9e4066Sahrens mutex_enter(&db->db_mtx); 1983fa9e4066Sahrens 1984c717a561Smaybee if (db->db_user_ptr == old_user_ptr) { 1985c717a561Smaybee db->db_user_ptr = user_ptr; 1986c717a561Smaybee db->db_user_data_ptr_ptr = user_data_ptr_ptr; 1987c717a561Smaybee db->db_evict_func = evict_func; 1988fa9e4066Sahrens 1989fa9e4066Sahrens dbuf_update_data(db); 1990fa9e4066Sahrens } else { 1991c717a561Smaybee old_user_ptr = db->db_user_ptr; 1992fa9e4066Sahrens } 1993fa9e4066Sahrens 1994fa9e4066Sahrens mutex_exit(&db->db_mtx); 1995fa9e4066Sahrens return (old_user_ptr); 1996fa9e4066Sahrens } 1997fa9e4066Sahrens 1998fa9e4066Sahrens void * 1999fa9e4066Sahrens dmu_buf_get_user(dmu_buf_t *db_fake) 2000fa9e4066Sahrens { 2001fa9e4066Sahrens dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 2002fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 2003fa9e4066Sahrens 2004c717a561Smaybee return (db->db_user_ptr); 2005fa9e4066Sahrens } 2006fa9e4066Sahrens 20073d692628SSanjeev Bagewadi boolean_t 20083d692628SSanjeev Bagewadi dmu_buf_freeable(dmu_buf_t *dbuf) 20093d692628SSanjeev Bagewadi { 20103d692628SSanjeev Bagewadi boolean_t res = B_FALSE; 20113d692628SSanjeev Bagewadi dmu_buf_impl_t *db = (dmu_buf_impl_t *)dbuf; 20123d692628SSanjeev Bagewadi 20133d692628SSanjeev Bagewadi if (db->db_blkptr) 20143d692628SSanjeev Bagewadi res = dsl_dataset_block_freeable(db->db_objset->os_dsl_dataset, 20153d692628SSanjeev Bagewadi db->db_blkptr->blk_birth); 20163d692628SSanjeev Bagewadi 20173d692628SSanjeev Bagewadi return (res); 20183d692628SSanjeev Bagewadi } 20193d692628SSanjeev Bagewadi 2020c717a561Smaybee static void 2021c717a561Smaybee dbuf_check_blkptr(dnode_t *dn, dmu_buf_impl_t *db) 2022fa9e4066Sahrens { 2023c717a561Smaybee /* ASSERT(dmu_tx_is_syncing(tx) */ 2024c717a561Smaybee ASSERT(MUTEX_HELD(&db->db_mtx)); 2025c717a561Smaybee 2026c717a561Smaybee if (db->db_blkptr != NULL) 2027c717a561Smaybee return; 2028c717a561Smaybee 20290a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) { 20300a586ceaSMark Shellenbaum db->db_blkptr = &dn->dn_phys->dn_spill; 20310a586ceaSMark Shellenbaum BP_ZERO(db->db_blkptr); 20320a586ceaSMark Shellenbaum return; 20330a586ceaSMark Shellenbaum } 2034c717a561Smaybee if (db->db_level == dn->dn_phys->dn_nlevels-1) { 2035c717a561Smaybee /* 2036c717a561Smaybee * This buffer was allocated at a time when there was 2037c717a561Smaybee * no available blkptrs from the dnode, or it was 2038c717a561Smaybee * inappropriate to hook it in (i.e., nlevels mis-match). 2039c717a561Smaybee */ 2040c717a561Smaybee ASSERT(db->db_blkid < dn->dn_phys->dn_nblkptr); 2041c717a561Smaybee ASSERT(db->db_parent == NULL); 2042c717a561Smaybee db->db_parent = dn->dn_dbuf; 2043c717a561Smaybee db->db_blkptr = &dn->dn_phys->dn_blkptr[db->db_blkid]; 2044c717a561Smaybee DBUF_VERIFY(db); 2045c717a561Smaybee } else { 2046c717a561Smaybee dmu_buf_impl_t *parent = db->db_parent; 2047c717a561Smaybee int epbs = dn->dn_phys->dn_indblkshift - SPA_BLKPTRSHIFT; 2048c717a561Smaybee 2049c717a561Smaybee ASSERT(dn->dn_phys->dn_nlevels > 1); 2050c717a561Smaybee if (parent == NULL) { 2051c717a561Smaybee mutex_exit(&db->db_mtx); 2052c717a561Smaybee rw_enter(&dn->dn_struct_rwlock, RW_READER); 2053c717a561Smaybee (void) dbuf_hold_impl(dn, db->db_level+1, 2054c717a561Smaybee db->db_blkid >> epbs, FALSE, db, &parent); 2055c717a561Smaybee rw_exit(&dn->dn_struct_rwlock); 2056c717a561Smaybee mutex_enter(&db->db_mtx); 2057c717a561Smaybee db->db_parent = parent; 2058c717a561Smaybee } 2059c717a561Smaybee db->db_blkptr = (blkptr_t *)parent->db.db_data + 2060c717a561Smaybee (db->db_blkid & ((1ULL << epbs) - 1)); 2061c717a561Smaybee DBUF_VERIFY(db); 2062c717a561Smaybee } 2063c717a561Smaybee } 2064c717a561Smaybee 2065c717a561Smaybee static void 2066c717a561Smaybee dbuf_sync_indirect(dbuf_dirty_record_t *dr, dmu_tx_t *tx) 2067c717a561Smaybee { 2068c717a561Smaybee dmu_buf_impl_t *db = dr->dr_dbuf; 2069c717a561Smaybee dnode_t *dn = db->db_dnode; 2070c717a561Smaybee zio_t *zio; 2071c717a561Smaybee 2072c717a561Smaybee ASSERT(dmu_tx_is_syncing(tx)); 2073c717a561Smaybee 2074c717a561Smaybee dprintf_dbuf_bp(db, db->db_blkptr, "blkptr=%p", db->db_blkptr); 2075c717a561Smaybee 2076c717a561Smaybee mutex_enter(&db->db_mtx); 2077c717a561Smaybee 2078c717a561Smaybee ASSERT(db->db_level > 0); 2079c717a561Smaybee DBUF_VERIFY(db); 2080c717a561Smaybee 2081c717a561Smaybee if (db->db_buf == NULL) { 2082c717a561Smaybee mutex_exit(&db->db_mtx); 2083c717a561Smaybee (void) dbuf_read(db, NULL, DB_RF_MUST_SUCCEED); 2084c717a561Smaybee mutex_enter(&db->db_mtx); 2085c717a561Smaybee } 2086c717a561Smaybee ASSERT3U(db->db_state, ==, DB_CACHED); 2087c717a561Smaybee ASSERT3U(db->db.db_size, ==, 1<<dn->dn_phys->dn_indblkshift); 2088c717a561Smaybee ASSERT(db->db_buf != NULL); 2089c717a561Smaybee 2090c717a561Smaybee dbuf_check_blkptr(dn, db); 2091c717a561Smaybee 2092c717a561Smaybee db->db_data_pending = dr; 2093c717a561Smaybee 2094af2c4821Smaybee mutex_exit(&db->db_mtx); 2095088f3894Sahrens dbuf_write(dr, db->db_buf, tx); 2096c717a561Smaybee 2097c717a561Smaybee zio = dr->dr_zio; 2098c717a561Smaybee mutex_enter(&dr->dt.di.dr_mtx); 2099c717a561Smaybee dbuf_sync_list(&dr->dt.di.dr_children, tx); 2100c717a561Smaybee ASSERT(list_head(&dr->dt.di.dr_children) == NULL); 2101c717a561Smaybee mutex_exit(&dr->dt.di.dr_mtx); 2102c717a561Smaybee zio_nowait(zio); 2103c717a561Smaybee } 2104c717a561Smaybee 2105c717a561Smaybee static void 2106c717a561Smaybee dbuf_sync_leaf(dbuf_dirty_record_t *dr, dmu_tx_t *tx) 2107c717a561Smaybee { 2108c717a561Smaybee arc_buf_t **datap = &dr->dt.dl.dr_data; 2109c717a561Smaybee dmu_buf_impl_t *db = dr->dr_dbuf; 2110fa9e4066Sahrens dnode_t *dn = db->db_dnode; 2111503ad85cSMatthew Ahrens objset_t *os = dn->dn_objset; 2112c717a561Smaybee uint64_t txg = tx->tx_txg; 2113fa9e4066Sahrens 2114fa9e4066Sahrens ASSERT(dmu_tx_is_syncing(tx)); 2115fa9e4066Sahrens 2116fa9e4066Sahrens dprintf_dbuf_bp(db, db->db_blkptr, "blkptr=%p", db->db_blkptr); 2117fa9e4066Sahrens 2118fa9e4066Sahrens mutex_enter(&db->db_mtx); 2119fa9e4066Sahrens /* 2120fa9e4066Sahrens * To be synced, we must be dirtied. But we 2121fa9e4066Sahrens * might have been freed after the dirty. 2122fa9e4066Sahrens */ 2123fa9e4066Sahrens if (db->db_state == DB_UNCACHED) { 2124fa9e4066Sahrens /* This buffer has been freed since it was dirtied */ 2125fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 2126fa9e4066Sahrens } else if (db->db_state == DB_FILL) { 2127fa9e4066Sahrens /* This buffer was freed and is now being re-filled */ 2128c717a561Smaybee ASSERT(db->db.db_data != dr->dt.dl.dr_data); 2129fa9e4066Sahrens } else { 213082c9918fSTim Haley ASSERT(db->db_state == DB_CACHED || db->db_state == DB_NOFILL); 2131fa9e4066Sahrens } 21329c9dc39aSek110237 DBUF_VERIFY(db); 2133fa9e4066Sahrens 21340a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) { 21350a586ceaSMark Shellenbaum mutex_enter(&dn->dn_mtx); 21360a586ceaSMark Shellenbaum dn->dn_phys->dn_flags |= DNODE_FLAG_SPILL_BLKPTR; 21370a586ceaSMark Shellenbaum mutex_exit(&dn->dn_mtx); 21380a586ceaSMark Shellenbaum } 21390a586ceaSMark Shellenbaum 2140fa9e4066Sahrens /* 2141c717a561Smaybee * If this is a bonus buffer, simply copy the bonus data into the 2142c717a561Smaybee * dnode. It will be written out when the dnode is synced (and it 2143c717a561Smaybee * will be synced, since it must have been dirty for dbuf_sync to 2144c717a561Smaybee * be called). 2145fa9e4066Sahrens */ 21460a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 2147c717a561Smaybee dbuf_dirty_record_t **drp; 21481934e92fSmaybee 2149ea8dc4b6Seschrock ASSERT(*datap != NULL); 2150ea8dc4b6Seschrock ASSERT3U(db->db_level, ==, 0); 2151ea8dc4b6Seschrock ASSERT3U(dn->dn_phys->dn_bonuslen, <=, DN_MAX_BONUSLEN); 2152ea8dc4b6Seschrock bcopy(*datap, DN_BONUS(dn->dn_phys), dn->dn_phys->dn_bonuslen); 21530e8c6158Smaybee if (*datap != db->db.db_data) { 2154ea8dc4b6Seschrock zio_buf_free(*datap, DN_MAX_BONUSLEN); 21555a98e54bSBrendan Gregg - Sun Microsystems arc_space_return(DN_MAX_BONUSLEN, ARC_SPACE_OTHER); 21560e8c6158Smaybee } 2157ea8dc4b6Seschrock db->db_data_pending = NULL; 2158c717a561Smaybee drp = &db->db_last_dirty; 2159c717a561Smaybee while (*drp != dr) 2160c717a561Smaybee drp = &(*drp)->dr_next; 216117f17c2dSbonwick ASSERT(dr->dr_next == NULL); 2162b24ab676SJeff Bonwick ASSERT(dr->dr_dbuf == db); 216317f17c2dSbonwick *drp = dr->dr_next; 2164c717a561Smaybee kmem_free(dr, sizeof (dbuf_dirty_record_t)); 2165ea8dc4b6Seschrock ASSERT(db->db_dirtycnt > 0); 2166ea8dc4b6Seschrock db->db_dirtycnt -= 1; 2167b24ab676SJeff Bonwick dbuf_rele_and_unlock(db, (void *)(uintptr_t)txg); 2168ea8dc4b6Seschrock return; 2169ea8dc4b6Seschrock } 2170ea8dc4b6Seschrock 2171c5c6ffa0Smaybee /* 2172f82bfe17Sgw25295 * This function may have dropped the db_mtx lock allowing a dmu_sync 2173f82bfe17Sgw25295 * operation to sneak in. As a result, we need to ensure that we 2174f82bfe17Sgw25295 * don't check the dr_override_state until we have returned from 2175f82bfe17Sgw25295 * dbuf_check_blkptr. 2176f82bfe17Sgw25295 */ 2177f82bfe17Sgw25295 dbuf_check_blkptr(dn, db); 2178f82bfe17Sgw25295 2179f82bfe17Sgw25295 /* 2180c717a561Smaybee * If this buffer is in the middle of an immdiate write, 2181c717a561Smaybee * wait for the synchronous IO to complete. 2182c5c6ffa0Smaybee */ 2183c717a561Smaybee while (dr->dt.dl.dr_override_state == DR_IN_DMU_SYNC) { 2184c5c6ffa0Smaybee ASSERT(dn->dn_object != DMU_META_DNODE_OBJECT); 2185c5c6ffa0Smaybee cv_wait(&db->db_changed, &db->db_mtx); 2186c717a561Smaybee ASSERT(dr->dt.dl.dr_override_state != DR_NOT_OVERRIDDEN); 2187c5c6ffa0Smaybee } 2188c717a561Smaybee 2189ab69d62fSMatthew Ahrens if (db->db_state != DB_NOFILL && 2190ab69d62fSMatthew Ahrens dn->dn_object != DMU_META_DNODE_OBJECT && 2191ab69d62fSMatthew Ahrens refcount_count(&db->db_holds) > 1 && 2192b24ab676SJeff Bonwick dr->dt.dl.dr_override_state != DR_OVERRIDDEN && 2193ab69d62fSMatthew Ahrens *datap == db->db_buf) { 2194fa9e4066Sahrens /* 219582c9918fSTim Haley * If this buffer is currently "in use" (i.e., there 219682c9918fSTim Haley * are active holds and db_data still references it), 219782c9918fSTim Haley * then make a copy before we start the write so that 219882c9918fSTim Haley * any modifications from the open txg will not leak 219982c9918fSTim Haley * into this write. 2200fa9e4066Sahrens * 220182c9918fSTim Haley * NOTE: this copy does not need to be made for 220282c9918fSTim Haley * objects only modified in the syncing context (e.g. 220382c9918fSTim Haley * DNONE_DNODE blocks). 2204fa9e4066Sahrens */ 2205ab69d62fSMatthew Ahrens int blksz = arc_buf_size(*datap); 2206ab69d62fSMatthew Ahrens arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 2207ab69d62fSMatthew Ahrens *datap = arc_buf_alloc(os->os_spa, blksz, db, type); 2208c717a561Smaybee bcopy(db->db.db_data, (*datap)->b_data, blksz); 2209fa9e4066Sahrens } 2210c717a561Smaybee db->db_data_pending = dr; 2211fa9e4066Sahrens 2212fa9e4066Sahrens mutex_exit(&db->db_mtx); 2213fa9e4066Sahrens 2214088f3894Sahrens dbuf_write(dr, *datap, tx); 2215c717a561Smaybee 2216c717a561Smaybee ASSERT(!list_link_active(&dr->dr_dirty_node)); 2217c717a561Smaybee if (dn->dn_object == DMU_META_DNODE_OBJECT) 2218c717a561Smaybee list_insert_tail(&dn->dn_dirty_records[txg&TXG_MASK], dr); 2219c717a561Smaybee else 2220c717a561Smaybee zio_nowait(dr->dr_zio); 2221fa9e4066Sahrens } 2222c717a561Smaybee 2223c717a561Smaybee void 2224c717a561Smaybee dbuf_sync_list(list_t *list, dmu_tx_t *tx) 2225c717a561Smaybee { 2226c717a561Smaybee dbuf_dirty_record_t *dr; 2227c717a561Smaybee 2228c717a561Smaybee while (dr = list_head(list)) { 2229c717a561Smaybee if (dr->dr_zio != NULL) { 2230c717a561Smaybee /* 2231c717a561Smaybee * If we find an already initialized zio then we 2232c717a561Smaybee * are processing the meta-dnode, and we have finished. 2233c717a561Smaybee * The dbufs for all dnodes are put back on the list 2234c717a561Smaybee * during processing, so that we can zio_wait() 2235c717a561Smaybee * these IOs after initiating all child IOs. 2236c717a561Smaybee */ 2237c717a561Smaybee ASSERT3U(dr->dr_dbuf->db.db_object, ==, 2238c717a561Smaybee DMU_META_DNODE_OBJECT); 2239c717a561Smaybee break; 2240fa9e4066Sahrens } 2241c717a561Smaybee list_remove(list, dr); 2242c717a561Smaybee if (dr->dr_dbuf->db_level > 0) 2243c717a561Smaybee dbuf_sync_indirect(dr, tx); 2244c717a561Smaybee else 2245c717a561Smaybee dbuf_sync_leaf(dr, tx); 2246c717a561Smaybee } 2247c717a561Smaybee } 2248c717a561Smaybee 2249fa9e4066Sahrens /* ARGSUSED */ 2250fa9e4066Sahrens static void 2251c717a561Smaybee dbuf_write_ready(zio_t *zio, arc_buf_t *buf, void *vdb) 2252fa9e4066Sahrens { 2253fa9e4066Sahrens dmu_buf_impl_t *db = vdb; 2254e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 2255c717a561Smaybee blkptr_t *bp_orig = &zio->io_bp_orig; 2256b24ab676SJeff Bonwick dnode_t *dn = db->db_dnode; 2257b24ab676SJeff Bonwick spa_t *spa = zio->io_spa; 2258b24ab676SJeff Bonwick int64_t delta; 2259fa9e4066Sahrens uint64_t fill = 0; 2260b24ab676SJeff Bonwick int i; 2261fa9e4066Sahrens 2262e14bb325SJeff Bonwick ASSERT(db->db_blkptr == bp); 2263e14bb325SJeff Bonwick 2264b24ab676SJeff Bonwick delta = bp_get_dsize_sync(spa, bp) - bp_get_dsize_sync(spa, bp_orig); 2265b24ab676SJeff Bonwick dnode_diduse_space(dn, delta - zio->io_prev_space_delta); 2266b24ab676SJeff Bonwick zio->io_prev_space_delta = delta; 2267fa9e4066Sahrens 2268e14bb325SJeff Bonwick if (BP_IS_HOLE(bp)) { 2269b24ab676SJeff Bonwick ASSERT(bp->blk_fill == 0); 2270c717a561Smaybee return; 2271c717a561Smaybee } 2272c717a561Smaybee 22730a586ceaSMark Shellenbaum ASSERT((db->db_blkid != DMU_SPILL_BLKID && 22740a586ceaSMark Shellenbaum BP_GET_TYPE(bp) == dn->dn_type) || 22750a586ceaSMark Shellenbaum (db->db_blkid == DMU_SPILL_BLKID && 22760a586ceaSMark Shellenbaum BP_GET_TYPE(bp) == dn->dn_bonustype)); 2277e14bb325SJeff Bonwick ASSERT(BP_GET_LEVEL(bp) == db->db_level); 2278e14bb325SJeff Bonwick 2279fa9e4066Sahrens mutex_enter(&db->db_mtx); 2280fa9e4066Sahrens 22810a586ceaSMark Shellenbaum #ifdef ZFS_DEBUG 22820a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) { 22830a586ceaSMark Shellenbaum dnode_t *dn = db->db_dnode; 22840a586ceaSMark Shellenbaum ASSERT(dn->dn_phys->dn_flags & DNODE_FLAG_SPILL_BLKPTR); 22850a586ceaSMark Shellenbaum ASSERT(!(BP_IS_HOLE(db->db_blkptr)) && 22860a586ceaSMark Shellenbaum db->db_blkptr == &dn->dn_phys->dn_spill); 22870a586ceaSMark Shellenbaum } 22880a586ceaSMark Shellenbaum #endif 22890a586ceaSMark Shellenbaum 2290fa9e4066Sahrens if (db->db_level == 0) { 2291fa9e4066Sahrens mutex_enter(&dn->dn_mtx); 22920a586ceaSMark Shellenbaum if (db->db_blkid > dn->dn_phys->dn_maxblkid && 22930a586ceaSMark Shellenbaum db->db_blkid != DMU_SPILL_BLKID) 2294fa9e4066Sahrens dn->dn_phys->dn_maxblkid = db->db_blkid; 2295fa9e4066Sahrens mutex_exit(&dn->dn_mtx); 2296fa9e4066Sahrens 2297fa9e4066Sahrens if (dn->dn_type == DMU_OT_DNODE) { 2298fa9e4066Sahrens dnode_phys_t *dnp = db->db.db_data; 2299fa9e4066Sahrens for (i = db->db.db_size >> DNODE_SHIFT; i > 0; 2300fa9e4066Sahrens i--, dnp++) { 2301fa9e4066Sahrens if (dnp->dn_type != DMU_OT_NONE) 2302fa9e4066Sahrens fill++; 2303fa9e4066Sahrens } 2304fa9e4066Sahrens } else { 2305fa9e4066Sahrens fill = 1; 2306fa9e4066Sahrens } 2307fa9e4066Sahrens } else { 2308e14bb325SJeff Bonwick blkptr_t *ibp = db->db.db_data; 2309fa9e4066Sahrens ASSERT3U(db->db.db_size, ==, 1<<dn->dn_phys->dn_indblkshift); 2310e14bb325SJeff Bonwick for (i = db->db.db_size >> SPA_BLKPTRSHIFT; i > 0; i--, ibp++) { 2311e14bb325SJeff Bonwick if (BP_IS_HOLE(ibp)) 2312fa9e4066Sahrens continue; 2313e14bb325SJeff Bonwick fill += ibp->blk_fill; 2314fa9e4066Sahrens } 2315fa9e4066Sahrens } 2316fa9e4066Sahrens 2317e14bb325SJeff Bonwick bp->blk_fill = fill; 2318fa9e4066Sahrens 2319fa9e4066Sahrens mutex_exit(&db->db_mtx); 2320fa9e4066Sahrens } 2321fa9e4066Sahrens 2322c717a561Smaybee /* ARGSUSED */ 2323c717a561Smaybee static void 2324c717a561Smaybee dbuf_write_done(zio_t *zio, arc_buf_t *buf, void *vdb) 2325c717a561Smaybee { 2326c717a561Smaybee dmu_buf_impl_t *db = vdb; 2327b24ab676SJeff Bonwick blkptr_t *bp = zio->io_bp; 2328b24ab676SJeff Bonwick blkptr_t *bp_orig = &zio->io_bp_orig; 2329b24ab676SJeff Bonwick dnode_t *dn = db->db_dnode; 2330b24ab676SJeff Bonwick objset_t *os = dn->dn_objset; 2331c717a561Smaybee uint64_t txg = zio->io_txg; 2332c717a561Smaybee dbuf_dirty_record_t **drp, *dr; 2333c717a561Smaybee 2334c717a561Smaybee ASSERT3U(zio->io_error, ==, 0); 2335b24ab676SJeff Bonwick ASSERT(db->db_blkptr == bp); 2336b24ab676SJeff Bonwick 2337b24ab676SJeff Bonwick if (zio->io_flags & ZIO_FLAG_IO_REWRITE) { 2338b24ab676SJeff Bonwick ASSERT(BP_EQUAL(bp, bp_orig)); 2339b24ab676SJeff Bonwick } else { 2340b24ab676SJeff Bonwick dsl_dataset_t *ds = os->os_dsl_dataset; 2341b24ab676SJeff Bonwick dmu_tx_t *tx = os->os_synctx; 2342b24ab676SJeff Bonwick 2343b24ab676SJeff Bonwick (void) dsl_dataset_block_kill(ds, bp_orig, tx, B_TRUE); 2344b24ab676SJeff Bonwick dsl_dataset_block_born(ds, bp, tx); 2345b24ab676SJeff Bonwick } 2346c717a561Smaybee 2347c717a561Smaybee mutex_enter(&db->db_mtx); 2348c717a561Smaybee 2349b24ab676SJeff Bonwick DBUF_VERIFY(db); 2350b24ab676SJeff Bonwick 2351c717a561Smaybee drp = &db->db_last_dirty; 235217f17c2dSbonwick while ((dr = *drp) != db->db_data_pending) 235317f17c2dSbonwick drp = &dr->dr_next; 235417f17c2dSbonwick ASSERT(!list_link_active(&dr->dr_dirty_node)); 235517f17c2dSbonwick ASSERT(dr->dr_txg == txg); 2356b24ab676SJeff Bonwick ASSERT(dr->dr_dbuf == db); 235717f17c2dSbonwick ASSERT(dr->dr_next == NULL); 235817f17c2dSbonwick *drp = dr->dr_next; 2359c717a561Smaybee 23600a586ceaSMark Shellenbaum #ifdef ZFS_DEBUG 23610a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) { 23620a586ceaSMark Shellenbaum dnode_t *dn = db->db_dnode; 23630a586ceaSMark Shellenbaum ASSERT(dn->dn_phys->dn_flags & DNODE_FLAG_SPILL_BLKPTR); 23640a586ceaSMark Shellenbaum ASSERT(!(BP_IS_HOLE(db->db_blkptr)) && 23650a586ceaSMark Shellenbaum db->db_blkptr == &dn->dn_phys->dn_spill); 23660a586ceaSMark Shellenbaum } 23670a586ceaSMark Shellenbaum #endif 23680a586ceaSMark Shellenbaum 2369c717a561Smaybee if (db->db_level == 0) { 23700a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 2371c717a561Smaybee ASSERT(dr->dt.dl.dr_override_state == DR_NOT_OVERRIDDEN); 237282c9918fSTim Haley if (db->db_state != DB_NOFILL) { 2373c717a561Smaybee if (dr->dt.dl.dr_data != db->db_buf) 237482c9918fSTim Haley VERIFY(arc_buf_remove_ref(dr->dt.dl.dr_data, 237582c9918fSTim Haley db) == 1); 2376b24ab676SJeff Bonwick else if (!arc_released(db->db_buf)) 2377c717a561Smaybee arc_set_callback(db->db_buf, dbuf_do_evict, db); 237882c9918fSTim Haley } 2379c717a561Smaybee } else { 2380c717a561Smaybee ASSERT(list_head(&dr->dt.di.dr_children) == NULL); 2381c717a561Smaybee ASSERT3U(db->db.db_size, ==, 1<<dn->dn_phys->dn_indblkshift); 2382c717a561Smaybee if (!BP_IS_HOLE(db->db_blkptr)) { 2383c717a561Smaybee int epbs = 2384c717a561Smaybee dn->dn_phys->dn_indblkshift - SPA_BLKPTRSHIFT; 2385c717a561Smaybee ASSERT3U(BP_GET_LSIZE(db->db_blkptr), ==, 2386c717a561Smaybee db->db.db_size); 2387c717a561Smaybee ASSERT3U(dn->dn_phys->dn_maxblkid 2388c717a561Smaybee >> (db->db_level * epbs), >=, db->db_blkid); 2389c717a561Smaybee arc_set_callback(db->db_buf, dbuf_do_evict, db); 2390c717a561Smaybee } 2391c25056deSgw25295 mutex_destroy(&dr->dt.di.dr_mtx); 2392c25056deSgw25295 list_destroy(&dr->dt.di.dr_children); 2393c717a561Smaybee } 2394c717a561Smaybee kmem_free(dr, sizeof (dbuf_dirty_record_t)); 2395c717a561Smaybee 2396c717a561Smaybee cv_broadcast(&db->db_changed); 2397c717a561Smaybee ASSERT(db->db_dirtycnt > 0); 2398c717a561Smaybee db->db_dirtycnt -= 1; 2399c717a561Smaybee db->db_data_pending = NULL; 2400b24ab676SJeff Bonwick dbuf_rele_and_unlock(db, (void *)(uintptr_t)txg); 2401b24ab676SJeff Bonwick } 2402b24ab676SJeff Bonwick 2403b24ab676SJeff Bonwick static void 2404b24ab676SJeff Bonwick dbuf_write_nofill_ready(zio_t *zio) 2405b24ab676SJeff Bonwick { 2406b24ab676SJeff Bonwick dbuf_write_ready(zio, NULL, zio->io_private); 2407b24ab676SJeff Bonwick } 2408b24ab676SJeff Bonwick 2409b24ab676SJeff Bonwick static void 2410b24ab676SJeff Bonwick dbuf_write_nofill_done(zio_t *zio) 2411b24ab676SJeff Bonwick { 2412b24ab676SJeff Bonwick dbuf_write_done(zio, NULL, zio->io_private); 2413b24ab676SJeff Bonwick } 2414b24ab676SJeff Bonwick 2415b24ab676SJeff Bonwick static void 2416b24ab676SJeff Bonwick dbuf_write_override_ready(zio_t *zio) 2417b24ab676SJeff Bonwick { 2418b24ab676SJeff Bonwick dbuf_dirty_record_t *dr = zio->io_private; 2419b24ab676SJeff Bonwick dmu_buf_impl_t *db = dr->dr_dbuf; 2420b24ab676SJeff Bonwick 2421b24ab676SJeff Bonwick dbuf_write_ready(zio, NULL, db); 2422b24ab676SJeff Bonwick } 2423b24ab676SJeff Bonwick 2424b24ab676SJeff Bonwick static void 2425b24ab676SJeff Bonwick dbuf_write_override_done(zio_t *zio) 2426b24ab676SJeff Bonwick { 2427b24ab676SJeff Bonwick dbuf_dirty_record_t *dr = zio->io_private; 2428b24ab676SJeff Bonwick dmu_buf_impl_t *db = dr->dr_dbuf; 2429b24ab676SJeff Bonwick blkptr_t *obp = &dr->dt.dl.dr_overridden_by; 2430b24ab676SJeff Bonwick 2431b24ab676SJeff Bonwick mutex_enter(&db->db_mtx); 2432b24ab676SJeff Bonwick if (!BP_EQUAL(zio->io_bp, obp)) { 2433b24ab676SJeff Bonwick if (!BP_IS_HOLE(obp)) 2434b24ab676SJeff Bonwick dsl_free(spa_get_dsl(zio->io_spa), zio->io_txg, obp); 2435b24ab676SJeff Bonwick arc_release(dr->dt.dl.dr_data, db); 2436b24ab676SJeff Bonwick } 2437c717a561Smaybee mutex_exit(&db->db_mtx); 2438c717a561Smaybee 2439b24ab676SJeff Bonwick dbuf_write_done(zio, NULL, db); 2440b24ab676SJeff Bonwick } 2441c717a561Smaybee 2442b24ab676SJeff Bonwick static void 2443b24ab676SJeff Bonwick dbuf_write(dbuf_dirty_record_t *dr, arc_buf_t *data, dmu_tx_t *tx) 2444b24ab676SJeff Bonwick { 2445b24ab676SJeff Bonwick dmu_buf_impl_t *db = dr->dr_dbuf; 2446b24ab676SJeff Bonwick dnode_t *dn = db->db_dnode; 2447b24ab676SJeff Bonwick objset_t *os = dn->dn_objset; 2448b24ab676SJeff Bonwick dmu_buf_impl_t *parent = db->db_parent; 2449b24ab676SJeff Bonwick uint64_t txg = tx->tx_txg; 2450b24ab676SJeff Bonwick zbookmark_t zb; 2451b24ab676SJeff Bonwick zio_prop_t zp; 2452b24ab676SJeff Bonwick zio_t *zio; 24530a586ceaSMark Shellenbaum int wp_flag = 0; 2454b24ab676SJeff Bonwick 2455b24ab676SJeff Bonwick if (db->db_state != DB_NOFILL) { 2456b24ab676SJeff Bonwick if (db->db_level > 0 || dn->dn_type == DMU_OT_DNODE) { 2457b24ab676SJeff Bonwick /* 2458b24ab676SJeff Bonwick * Private object buffers are released here rather 2459b24ab676SJeff Bonwick * than in dbuf_dirty() since they are only modified 2460b24ab676SJeff Bonwick * in the syncing context and we don't want the 2461b24ab676SJeff Bonwick * overhead of making multiple copies of the data. 2462b24ab676SJeff Bonwick */ 2463b24ab676SJeff Bonwick if (BP_IS_HOLE(db->db_blkptr)) { 2464b24ab676SJeff Bonwick arc_buf_thaw(data); 2465b24ab676SJeff Bonwick } else { 2466b24ab676SJeff Bonwick arc_release(data, db); 2467b24ab676SJeff Bonwick } 2468b24ab676SJeff Bonwick } 2469b24ab676SJeff Bonwick } 2470b24ab676SJeff Bonwick 2471b24ab676SJeff Bonwick if (parent != dn->dn_dbuf) { 2472b24ab676SJeff Bonwick ASSERT(parent && parent->db_data_pending); 2473b24ab676SJeff Bonwick ASSERT(db->db_level == parent->db_level-1); 2474b24ab676SJeff Bonwick ASSERT(arc_released(parent->db_buf)); 2475b24ab676SJeff Bonwick zio = parent->db_data_pending->dr_zio; 2476b24ab676SJeff Bonwick } else { 24770a586ceaSMark Shellenbaum ASSERT((db->db_level == dn->dn_phys->dn_nlevels-1 && 24780a586ceaSMark Shellenbaum db->db_blkid != DMU_SPILL_BLKID) || 24790a586ceaSMark Shellenbaum (db->db_blkid == DMU_SPILL_BLKID && db->db_level == 0)); 24800a586ceaSMark Shellenbaum if (db->db_blkid != DMU_SPILL_BLKID) 2481b24ab676SJeff Bonwick ASSERT3P(db->db_blkptr, ==, 2482b24ab676SJeff Bonwick &dn->dn_phys->dn_blkptr[db->db_blkid]); 2483b24ab676SJeff Bonwick zio = dn->dn_zio; 2484b24ab676SJeff Bonwick } 2485b24ab676SJeff Bonwick 2486b24ab676SJeff Bonwick ASSERT(db->db_level == 0 || data == db->db_buf); 2487b24ab676SJeff Bonwick ASSERT3U(db->db_blkptr->blk_birth, <=, txg); 2488b24ab676SJeff Bonwick ASSERT(zio); 2489b24ab676SJeff Bonwick 2490b24ab676SJeff Bonwick SET_BOOKMARK(&zb, os->os_dsl_dataset ? 2491b24ab676SJeff Bonwick os->os_dsl_dataset->ds_object : DMU_META_OBJSET, 2492b24ab676SJeff Bonwick db->db.db_object, db->db_level, db->db_blkid); 2493b24ab676SJeff Bonwick 24940a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) 24950a586ceaSMark Shellenbaum wp_flag = WP_SPILL; 24960a586ceaSMark Shellenbaum wp_flag |= (db->db_state == DB_NOFILL) ? WP_NOFILL : 0; 24970a586ceaSMark Shellenbaum 24980a586ceaSMark Shellenbaum dmu_write_policy(os, dn, db->db_level, wp_flag, &zp); 2499b24ab676SJeff Bonwick 2500b24ab676SJeff Bonwick if (db->db_level == 0 && dr->dt.dl.dr_override_state == DR_OVERRIDDEN) { 2501b24ab676SJeff Bonwick ASSERT(db->db_state != DB_NOFILL); 2502b24ab676SJeff Bonwick dr->dr_zio = zio_write(zio, os->os_spa, txg, 2503b24ab676SJeff Bonwick db->db_blkptr, data->b_data, arc_buf_size(data), &zp, 2504b24ab676SJeff Bonwick dbuf_write_override_ready, dbuf_write_override_done, dr, 2505b24ab676SJeff Bonwick ZIO_PRIORITY_ASYNC_WRITE, ZIO_FLAG_MUSTSUCCEED, &zb); 2506b24ab676SJeff Bonwick mutex_enter(&db->db_mtx); 2507b24ab676SJeff Bonwick dr->dt.dl.dr_override_state = DR_NOT_OVERRIDDEN; 2508b24ab676SJeff Bonwick zio_write_override(dr->dr_zio, &dr->dt.dl.dr_overridden_by, 2509b24ab676SJeff Bonwick dr->dt.dl.dr_copies); 2510b24ab676SJeff Bonwick mutex_exit(&db->db_mtx); 2511b24ab676SJeff Bonwick } else if (db->db_state == DB_NOFILL) { 2512b24ab676SJeff Bonwick ASSERT(zp.zp_checksum == ZIO_CHECKSUM_OFF); 2513b24ab676SJeff Bonwick dr->dr_zio = zio_write(zio, os->os_spa, txg, 2514b24ab676SJeff Bonwick db->db_blkptr, NULL, db->db.db_size, &zp, 2515b24ab676SJeff Bonwick dbuf_write_nofill_ready, dbuf_write_nofill_done, db, 2516b24ab676SJeff Bonwick ZIO_PRIORITY_ASYNC_WRITE, 2517b24ab676SJeff Bonwick ZIO_FLAG_MUSTSUCCEED | ZIO_FLAG_NODATA, &zb); 2518b24ab676SJeff Bonwick } else { 2519b24ab676SJeff Bonwick ASSERT(arc_released(data)); 2520b24ab676SJeff Bonwick dr->dr_zio = arc_write(zio, os->os_spa, txg, 2521b24ab676SJeff Bonwick db->db_blkptr, data, DBUF_IS_L2CACHEABLE(db), &zp, 2522b24ab676SJeff Bonwick dbuf_write_ready, dbuf_write_done, db, 2523b24ab676SJeff Bonwick ZIO_PRIORITY_ASYNC_WRITE, ZIO_FLAG_MUSTSUCCEED, &zb); 2524b24ab676SJeff Bonwick } 2525fa9e4066Sahrens } 2526