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 /* 22c242f9a0Schunli zhang - Sun Microsystems - Irvine United States * Copyright 2010 Sun Microsystems, Inc. All rights reserved. 23fa9e4066Sahrens * Use is subject to license terms. 24fa9e4066Sahrens */ 25fa9e4066Sahrens 26fa9e4066Sahrens #include <sys/zfs_context.h> 27fa9e4066Sahrens #include <sys/dmu.h> 28fa9e4066Sahrens #include <sys/dmu_impl.h> 29fa9e4066Sahrens #include <sys/dbuf.h> 30fa9e4066Sahrens #include <sys/dmu_objset.h> 31fa9e4066Sahrens #include <sys/dsl_dataset.h> 32fa9e4066Sahrens #include <sys/dsl_dir.h> 33fa9e4066Sahrens #include <sys/dmu_tx.h> 34fa9e4066Sahrens #include <sys/spa.h> 35fa9e4066Sahrens #include <sys/zio.h> 36fa9e4066Sahrens #include <sys/dmu_zfetch.h> 37*0a586ceaSMark Shellenbaum #include <sys/sa.h> 38*0a586ceaSMark Shellenbaum #include <sys/sa_impl.h> 39fa9e4066Sahrens 40fa9e4066Sahrens static void dbuf_destroy(dmu_buf_impl_t *db); 41fa9e4066Sahrens static int dbuf_undirty(dmu_buf_impl_t *db, dmu_tx_t *tx); 42088f3894Sahrens static void dbuf_write(dbuf_dirty_record_t *dr, arc_buf_t *data, dmu_tx_t *tx); 43fa9e4066Sahrens 44fa9e4066Sahrens /* 45fa9e4066Sahrens * Global data structures and functions for the dbuf cache. 46fa9e4066Sahrens */ 47fa9e4066Sahrens static kmem_cache_t *dbuf_cache; 48fa9e4066Sahrens 49fa9e4066Sahrens /* ARGSUSED */ 50fa9e4066Sahrens static int 51fa9e4066Sahrens dbuf_cons(void *vdb, void *unused, int kmflag) 52fa9e4066Sahrens { 53fa9e4066Sahrens dmu_buf_impl_t *db = vdb; 54fa9e4066Sahrens bzero(db, sizeof (dmu_buf_impl_t)); 55fa9e4066Sahrens 56fa9e4066Sahrens mutex_init(&db->db_mtx, NULL, MUTEX_DEFAULT, NULL); 57fa9e4066Sahrens cv_init(&db->db_changed, NULL, CV_DEFAULT, NULL); 58fa9e4066Sahrens refcount_create(&db->db_holds); 59fa9e4066Sahrens return (0); 60fa9e4066Sahrens } 61fa9e4066Sahrens 62fa9e4066Sahrens /* ARGSUSED */ 63fa9e4066Sahrens static void 64fa9e4066Sahrens dbuf_dest(void *vdb, void *unused) 65fa9e4066Sahrens { 66fa9e4066Sahrens dmu_buf_impl_t *db = vdb; 67fa9e4066Sahrens mutex_destroy(&db->db_mtx); 68fa9e4066Sahrens cv_destroy(&db->db_changed); 69fa9e4066Sahrens refcount_destroy(&db->db_holds); 70fa9e4066Sahrens } 71fa9e4066Sahrens 72fa9e4066Sahrens /* 73fa9e4066Sahrens * dbuf hash table routines 74fa9e4066Sahrens */ 75fa9e4066Sahrens static dbuf_hash_table_t dbuf_hash_table; 76fa9e4066Sahrens 77fa9e4066Sahrens static uint64_t dbuf_hash_count; 78fa9e4066Sahrens 79fa9e4066Sahrens static uint64_t 80fa9e4066Sahrens dbuf_hash(void *os, uint64_t obj, uint8_t lvl, uint64_t blkid) 81fa9e4066Sahrens { 82fa9e4066Sahrens uintptr_t osv = (uintptr_t)os; 83fa9e4066Sahrens uint64_t crc = -1ULL; 84fa9e4066Sahrens 85fa9e4066Sahrens ASSERT(zfs_crc64_table[128] == ZFS_CRC64_POLY); 86fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (lvl)) & 0xFF]; 87fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (osv >> 6)) & 0xFF]; 88fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (obj >> 0)) & 0xFF]; 89fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (obj >> 8)) & 0xFF]; 90fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (blkid >> 0)) & 0xFF]; 91fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (blkid >> 8)) & 0xFF]; 92fa9e4066Sahrens 93fa9e4066Sahrens crc ^= (osv>>14) ^ (obj>>16) ^ (blkid>>16); 94fa9e4066Sahrens 95fa9e4066Sahrens return (crc); 96fa9e4066Sahrens } 97fa9e4066Sahrens 98fa9e4066Sahrens #define DBUF_HASH(os, obj, level, blkid) dbuf_hash(os, obj, level, blkid); 99fa9e4066Sahrens 100fa9e4066Sahrens #define DBUF_EQUAL(dbuf, os, obj, level, blkid) \ 101fa9e4066Sahrens ((dbuf)->db.db_object == (obj) && \ 102fa9e4066Sahrens (dbuf)->db_objset == (os) && \ 103fa9e4066Sahrens (dbuf)->db_level == (level) && \ 104fa9e4066Sahrens (dbuf)->db_blkid == (blkid)) 105fa9e4066Sahrens 106fa9e4066Sahrens dmu_buf_impl_t * 107fa9e4066Sahrens dbuf_find(dnode_t *dn, uint8_t level, uint64_t blkid) 108fa9e4066Sahrens { 109fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 110503ad85cSMatthew Ahrens objset_t *os = dn->dn_objset; 111fa9e4066Sahrens uint64_t obj = dn->dn_object; 112fa9e4066Sahrens uint64_t hv = DBUF_HASH(os, obj, level, blkid); 113fa9e4066Sahrens uint64_t idx = hv & h->hash_table_mask; 114fa9e4066Sahrens dmu_buf_impl_t *db; 115fa9e4066Sahrens 116fa9e4066Sahrens mutex_enter(DBUF_HASH_MUTEX(h, idx)); 117fa9e4066Sahrens for (db = h->hash_table[idx]; db != NULL; db = db->db_hash_next) { 118fa9e4066Sahrens if (DBUF_EQUAL(db, os, obj, level, blkid)) { 119fa9e4066Sahrens mutex_enter(&db->db_mtx); 120ea8dc4b6Seschrock if (db->db_state != DB_EVICTING) { 121fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 122fa9e4066Sahrens return (db); 123fa9e4066Sahrens } 124fa9e4066Sahrens mutex_exit(&db->db_mtx); 125fa9e4066Sahrens } 126fa9e4066Sahrens } 127fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 128fa9e4066Sahrens return (NULL); 129fa9e4066Sahrens } 130fa9e4066Sahrens 131fa9e4066Sahrens /* 132fa9e4066Sahrens * Insert an entry into the hash table. If there is already an element 133fa9e4066Sahrens * equal to elem in the hash table, then the already existing element 134fa9e4066Sahrens * will be returned and the new element will not be inserted. 135fa9e4066Sahrens * Otherwise returns NULL. 136fa9e4066Sahrens */ 137fa9e4066Sahrens static dmu_buf_impl_t * 138fa9e4066Sahrens dbuf_hash_insert(dmu_buf_impl_t *db) 139fa9e4066Sahrens { 140fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 141503ad85cSMatthew Ahrens objset_t *os = db->db_objset; 142fa9e4066Sahrens uint64_t obj = db->db.db_object; 143fa9e4066Sahrens int level = db->db_level; 144fa9e4066Sahrens uint64_t blkid = db->db_blkid; 145fa9e4066Sahrens uint64_t hv = DBUF_HASH(os, obj, level, blkid); 146fa9e4066Sahrens uint64_t idx = hv & h->hash_table_mask; 147fa9e4066Sahrens dmu_buf_impl_t *dbf; 148fa9e4066Sahrens 149fa9e4066Sahrens mutex_enter(DBUF_HASH_MUTEX(h, idx)); 150fa9e4066Sahrens for (dbf = h->hash_table[idx]; dbf != NULL; dbf = dbf->db_hash_next) { 151fa9e4066Sahrens if (DBUF_EQUAL(dbf, os, obj, level, blkid)) { 152fa9e4066Sahrens mutex_enter(&dbf->db_mtx); 153ea8dc4b6Seschrock if (dbf->db_state != DB_EVICTING) { 154fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 155fa9e4066Sahrens return (dbf); 156fa9e4066Sahrens } 157fa9e4066Sahrens mutex_exit(&dbf->db_mtx); 158fa9e4066Sahrens } 159fa9e4066Sahrens } 160fa9e4066Sahrens 161fa9e4066Sahrens mutex_enter(&db->db_mtx); 162fa9e4066Sahrens db->db_hash_next = h->hash_table[idx]; 163fa9e4066Sahrens h->hash_table[idx] = db; 164fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 165fa9e4066Sahrens atomic_add_64(&dbuf_hash_count, 1); 166fa9e4066Sahrens 167fa9e4066Sahrens return (NULL); 168fa9e4066Sahrens } 169fa9e4066Sahrens 170fa9e4066Sahrens /* 171fa9e4066Sahrens * Remove an entry from the hash table. This operation will 172fa9e4066Sahrens * fail if there are any existing holds on the db. 173fa9e4066Sahrens */ 174fa9e4066Sahrens static void 175fa9e4066Sahrens dbuf_hash_remove(dmu_buf_impl_t *db) 176fa9e4066Sahrens { 177fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 178fa9e4066Sahrens uint64_t hv = DBUF_HASH(db->db_objset, db->db.db_object, 179fa9e4066Sahrens db->db_level, db->db_blkid); 180fa9e4066Sahrens uint64_t idx = hv & h->hash_table_mask; 181fa9e4066Sahrens dmu_buf_impl_t *dbf, **dbp; 182fa9e4066Sahrens 183fa9e4066Sahrens /* 184fa9e4066Sahrens * We musn't hold db_mtx to maintin lock ordering: 185fa9e4066Sahrens * DBUF_HASH_MUTEX > db_mtx. 186fa9e4066Sahrens */ 187fa9e4066Sahrens ASSERT(refcount_is_zero(&db->db_holds)); 188ea8dc4b6Seschrock ASSERT(db->db_state == DB_EVICTING); 189fa9e4066Sahrens ASSERT(!MUTEX_HELD(&db->db_mtx)); 190fa9e4066Sahrens 191fa9e4066Sahrens mutex_enter(DBUF_HASH_MUTEX(h, idx)); 192fa9e4066Sahrens dbp = &h->hash_table[idx]; 193fa9e4066Sahrens while ((dbf = *dbp) != db) { 194fa9e4066Sahrens dbp = &dbf->db_hash_next; 195fa9e4066Sahrens ASSERT(dbf != NULL); 196fa9e4066Sahrens } 197fa9e4066Sahrens *dbp = db->db_hash_next; 198fa9e4066Sahrens db->db_hash_next = NULL; 199fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 200fa9e4066Sahrens atomic_add_64(&dbuf_hash_count, -1); 201fa9e4066Sahrens } 202fa9e4066Sahrens 203ea8dc4b6Seschrock static arc_evict_func_t dbuf_do_evict; 204fa9e4066Sahrens 205fa9e4066Sahrens static void 206fa9e4066Sahrens dbuf_evict_user(dmu_buf_impl_t *db) 207fa9e4066Sahrens { 208fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 209fa9e4066Sahrens 210c717a561Smaybee if (db->db_level != 0 || db->db_evict_func == NULL) 211fa9e4066Sahrens return; 212fa9e4066Sahrens 213c717a561Smaybee if (db->db_user_data_ptr_ptr) 214c717a561Smaybee *db->db_user_data_ptr_ptr = db->db.db_data; 215c717a561Smaybee db->db_evict_func(&db->db, db->db_user_ptr); 216c717a561Smaybee db->db_user_ptr = NULL; 217c717a561Smaybee db->db_user_data_ptr_ptr = NULL; 218c717a561Smaybee db->db_evict_func = NULL; 219fa9e4066Sahrens } 220fa9e4066Sahrens 221ea8dc4b6Seschrock void 222ea8dc4b6Seschrock dbuf_evict(dmu_buf_impl_t *db) 223ea8dc4b6Seschrock { 224ea8dc4b6Seschrock ASSERT(MUTEX_HELD(&db->db_mtx)); 225ea8dc4b6Seschrock ASSERT(db->db_buf == NULL); 226c717a561Smaybee ASSERT(db->db_data_pending == NULL); 227ea8dc4b6Seschrock 228ea8dc4b6Seschrock dbuf_clear(db); 229ea8dc4b6Seschrock dbuf_destroy(db); 230ea8dc4b6Seschrock } 231ea8dc4b6Seschrock 232fa9e4066Sahrens void 233fa9e4066Sahrens dbuf_init(void) 234fa9e4066Sahrens { 235ea8dc4b6Seschrock uint64_t hsize = 1ULL << 16; 236fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 237fa9e4066Sahrens int i; 238fa9e4066Sahrens 239fa9e4066Sahrens /* 240fa9e4066Sahrens * The hash table is big enough to fill all of physical memory 241ea8dc4b6Seschrock * with an average 4K block size. The table will take up 242ea8dc4b6Seschrock * totalmem*sizeof(void*)/4K (i.e. 2MB/GB with 8-byte pointers). 243fa9e4066Sahrens */ 244ea8dc4b6Seschrock while (hsize * 4096 < physmem * PAGESIZE) 245fa9e4066Sahrens hsize <<= 1; 246fa9e4066Sahrens 247ea8dc4b6Seschrock retry: 248fa9e4066Sahrens h->hash_table_mask = hsize - 1; 249ea8dc4b6Seschrock h->hash_table = kmem_zalloc(hsize * sizeof (void *), KM_NOSLEEP); 250ea8dc4b6Seschrock if (h->hash_table == NULL) { 251ea8dc4b6Seschrock /* XXX - we should really return an error instead of assert */ 252ea8dc4b6Seschrock ASSERT(hsize > (1ULL << 10)); 253ea8dc4b6Seschrock hsize >>= 1; 254ea8dc4b6Seschrock goto retry; 255ea8dc4b6Seschrock } 256fa9e4066Sahrens 257fa9e4066Sahrens dbuf_cache = kmem_cache_create("dmu_buf_impl_t", 258fa9e4066Sahrens sizeof (dmu_buf_impl_t), 259fa9e4066Sahrens 0, dbuf_cons, dbuf_dest, NULL, NULL, NULL, 0); 260fa9e4066Sahrens 261fa9e4066Sahrens for (i = 0; i < DBUF_MUTEXES; i++) 262fa9e4066Sahrens mutex_init(&h->hash_mutexes[i], NULL, MUTEX_DEFAULT, NULL); 263fa9e4066Sahrens } 264fa9e4066Sahrens 265fa9e4066Sahrens void 266fa9e4066Sahrens dbuf_fini(void) 267fa9e4066Sahrens { 268fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 269fa9e4066Sahrens int i; 270fa9e4066Sahrens 271fa9e4066Sahrens for (i = 0; i < DBUF_MUTEXES; i++) 272fa9e4066Sahrens mutex_destroy(&h->hash_mutexes[i]); 273fa9e4066Sahrens kmem_free(h->hash_table, (h->hash_table_mask + 1) * sizeof (void *)); 274fa9e4066Sahrens kmem_cache_destroy(dbuf_cache); 275fa9e4066Sahrens } 276fa9e4066Sahrens 277fa9e4066Sahrens /* 278fa9e4066Sahrens * Other stuff. 279fa9e4066Sahrens */ 280fa9e4066Sahrens 2819c9dc39aSek #ifdef ZFS_DEBUG 282fa9e4066Sahrens static void 283fa9e4066Sahrens dbuf_verify(dmu_buf_impl_t *db) 284fa9e4066Sahrens { 285fa9e4066Sahrens dnode_t *dn = db->db_dnode; 286b24ab676SJeff Bonwick dbuf_dirty_record_t *dr; 287fa9e4066Sahrens 288fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 289fa9e4066Sahrens 290fa9e4066Sahrens if (!(zfs_flags & ZFS_DEBUG_DBUF_VERIFY)) 291fa9e4066Sahrens return; 292fa9e4066Sahrens 293fa9e4066Sahrens ASSERT(db->db_objset != NULL); 294fa9e4066Sahrens if (dn == NULL) { 295fa9e4066Sahrens ASSERT(db->db_parent == NULL); 296fa9e4066Sahrens ASSERT(db->db_blkptr == NULL); 297fa9e4066Sahrens } else { 298fa9e4066Sahrens ASSERT3U(db->db.db_object, ==, dn->dn_object); 299fa9e4066Sahrens ASSERT3P(db->db_objset, ==, dn->dn_objset); 300fa9e4066Sahrens ASSERT3U(db->db_level, <, dn->dn_nlevels); 301*0a586ceaSMark Shellenbaum ASSERT(db->db_blkid == DMU_BONUS_BLKID || db->db_blkid == 302*0a586ceaSMark Shellenbaum DMU_SPILL_BLKID || list_head(&dn->dn_dbufs)); 303fa9e4066Sahrens } 304*0a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 305fa9e4066Sahrens ASSERT(dn != NULL); 3061934e92fSmaybee ASSERT3U(db->db.db_size, >=, dn->dn_bonuslen); 307*0a586ceaSMark Shellenbaum ASSERT3U(db->db.db_offset, ==, DMU_BONUS_BLKID); 308*0a586ceaSMark Shellenbaum } else if (db->db_blkid == DMU_SPILL_BLKID) { 309*0a586ceaSMark Shellenbaum ASSERT(dn != NULL); 310*0a586ceaSMark Shellenbaum ASSERT3U(db->db.db_size, >=, dn->dn_bonuslen); 311*0a586ceaSMark Shellenbaum ASSERT3U(db->db.db_offset, ==, 0); 312fa9e4066Sahrens } else { 313fa9e4066Sahrens ASSERT3U(db->db.db_offset, ==, db->db_blkid * db->db.db_size); 314fa9e4066Sahrens } 315fa9e4066Sahrens 316b24ab676SJeff Bonwick for (dr = db->db_data_pending; dr != NULL; dr = dr->dr_next) 317b24ab676SJeff Bonwick ASSERT(dr->dr_dbuf == db); 318b24ab676SJeff Bonwick 319b24ab676SJeff Bonwick for (dr = db->db_last_dirty; dr != NULL; dr = dr->dr_next) 320b24ab676SJeff Bonwick ASSERT(dr->dr_dbuf == db); 321b24ab676SJeff Bonwick 32288b7b0f2SMatthew Ahrens /* 32388b7b0f2SMatthew Ahrens * We can't assert that db_size matches dn_datablksz because it 32488b7b0f2SMatthew Ahrens * can be momentarily different when another thread is doing 32588b7b0f2SMatthew Ahrens * dnode_set_blksz(). 32688b7b0f2SMatthew Ahrens */ 32788b7b0f2SMatthew Ahrens if (db->db_level == 0 && db->db.db_object == DMU_META_DNODE_OBJECT) { 328b24ab676SJeff Bonwick dr = db->db_data_pending; 32988b7b0f2SMatthew Ahrens /* 33088b7b0f2SMatthew Ahrens * It should only be modified in syncing context, so 33188b7b0f2SMatthew Ahrens * make sure we only have one copy of the data. 33288b7b0f2SMatthew Ahrens */ 33388b7b0f2SMatthew Ahrens ASSERT(dr == NULL || dr->dt.dl.dr_data == db->db_buf); 334fa9e4066Sahrens } 335fa9e4066Sahrens 336fa9e4066Sahrens /* verify db->db_blkptr */ 337fa9e4066Sahrens if (db->db_blkptr) { 338fa9e4066Sahrens if (db->db_parent == dn->dn_dbuf) { 339fa9e4066Sahrens /* db is pointed to by the dnode */ 340fa9e4066Sahrens /* ASSERT3U(db->db_blkid, <, dn->dn_nblkptr); */ 34114843421SMatthew Ahrens if (DMU_OBJECT_IS_SPECIAL(db->db.db_object)) 342fa9e4066Sahrens ASSERT(db->db_parent == NULL); 343fa9e4066Sahrens else 344fa9e4066Sahrens ASSERT(db->db_parent != NULL); 345*0a586ceaSMark Shellenbaum if (db->db_blkid != DMU_SPILL_BLKID) 346*0a586ceaSMark Shellenbaum ASSERT3P(db->db_blkptr, ==, 347*0a586ceaSMark Shellenbaum &dn->dn_phys->dn_blkptr[db->db_blkid]); 348fa9e4066Sahrens } else { 349fa9e4066Sahrens /* db is pointed to by an indirect block */ 350fa9e4066Sahrens int epb = db->db_parent->db.db_size >> SPA_BLKPTRSHIFT; 351fa9e4066Sahrens ASSERT3U(db->db_parent->db_level, ==, db->db_level+1); 352fa9e4066Sahrens ASSERT3U(db->db_parent->db.db_object, ==, 353fa9e4066Sahrens db->db.db_object); 354fa9e4066Sahrens /* 355fa9e4066Sahrens * dnode_grow_indblksz() can make this fail if we don't 356fa9e4066Sahrens * have the struct_rwlock. XXX indblksz no longer 357fa9e4066Sahrens * grows. safe to do this now? 358fa9e4066Sahrens */ 359fa9e4066Sahrens if (RW_WRITE_HELD(&db->db_dnode->dn_struct_rwlock)) { 360fa9e4066Sahrens ASSERT3P(db->db_blkptr, ==, 361fa9e4066Sahrens ((blkptr_t *)db->db_parent->db.db_data + 362fa9e4066Sahrens db->db_blkid % epb)); 363fa9e4066Sahrens } 364fa9e4066Sahrens } 365fa9e4066Sahrens } 366fa9e4066Sahrens if ((db->db_blkptr == NULL || BP_IS_HOLE(db->db_blkptr)) && 367*0a586ceaSMark Shellenbaum db->db.db_data && db->db_blkid != DMU_BONUS_BLKID && 368fa9e4066Sahrens db->db_state != DB_FILL && !dn->dn_free_txg) { 369fa9e4066Sahrens /* 370fa9e4066Sahrens * If the blkptr isn't set but they have nonzero data, 371fa9e4066Sahrens * it had better be dirty, otherwise we'll lose that 372fa9e4066Sahrens * data when we evict this buffer. 373fa9e4066Sahrens */ 374fa9e4066Sahrens if (db->db_dirtycnt == 0) { 375fa9e4066Sahrens uint64_t *buf = db->db.db_data; 376fa9e4066Sahrens int i; 377fa9e4066Sahrens 378fa9e4066Sahrens for (i = 0; i < db->db.db_size >> 3; i++) { 379fa9e4066Sahrens ASSERT(buf[i] == 0); 380fa9e4066Sahrens } 381fa9e4066Sahrens } 382fa9e4066Sahrens } 383fa9e4066Sahrens } 3849c9dc39aSek #endif 385fa9e4066Sahrens 386fa9e4066Sahrens static void 387fa9e4066Sahrens dbuf_update_data(dmu_buf_impl_t *db) 388fa9e4066Sahrens { 389fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 390c717a561Smaybee if (db->db_level == 0 && db->db_user_data_ptr_ptr) { 391fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 392c717a561Smaybee *db->db_user_data_ptr_ptr = db->db.db_data; 393fa9e4066Sahrens } 394fa9e4066Sahrens } 395fa9e4066Sahrens 396fa9e4066Sahrens static void 397fa9e4066Sahrens dbuf_set_data(dmu_buf_impl_t *db, arc_buf_t *buf) 398fa9e4066Sahrens { 399fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 400ea8dc4b6Seschrock ASSERT(db->db_buf == NULL || !arc_has_callback(db->db_buf)); 401fa9e4066Sahrens db->db_buf = buf; 402ea8dc4b6Seschrock if (buf != NULL) { 403ea8dc4b6Seschrock ASSERT(buf->b_data != NULL); 404ea8dc4b6Seschrock db->db.db_data = buf->b_data; 405ea8dc4b6Seschrock if (!arc_released(buf)) 406ea8dc4b6Seschrock arc_set_callback(buf, dbuf_do_evict, db); 407ea8dc4b6Seschrock dbuf_update_data(db); 408ea8dc4b6Seschrock } else { 409ea8dc4b6Seschrock dbuf_evict_user(db); 410ea8dc4b6Seschrock db->db.db_data = NULL; 41182c9918fSTim Haley if (db->db_state != DB_NOFILL) 41282c9918fSTim Haley db->db_state = DB_UNCACHED; 413ea8dc4b6Seschrock } 414fa9e4066Sahrens } 415fa9e4066Sahrens 416c242f9a0Schunli zhang - Sun Microsystems - Irvine United States /* 417c242f9a0Schunli zhang - Sun Microsystems - Irvine United States * Loan out an arc_buf for read. Return the loaned arc_buf. 418c242f9a0Schunli zhang - Sun Microsystems - Irvine United States */ 419c242f9a0Schunli zhang - Sun Microsystems - Irvine United States arc_buf_t * 420c242f9a0Schunli zhang - Sun Microsystems - Irvine United States dbuf_loan_arcbuf(dmu_buf_impl_t *db) 421c242f9a0Schunli zhang - Sun Microsystems - Irvine United States { 422c242f9a0Schunli zhang - Sun Microsystems - Irvine United States arc_buf_t *abuf; 423c242f9a0Schunli zhang - Sun Microsystems - Irvine United States 424c242f9a0Schunli zhang - Sun Microsystems - Irvine United States mutex_enter(&db->db_mtx); 425c242f9a0Schunli zhang - Sun Microsystems - Irvine United States if (arc_released(db->db_buf) || refcount_count(&db->db_holds) > 1) { 426c242f9a0Schunli zhang - Sun Microsystems - Irvine United States int blksz = db->db.db_size; 427c242f9a0Schunli zhang - Sun Microsystems - Irvine United States mutex_exit(&db->db_mtx); 428c242f9a0Schunli zhang - Sun Microsystems - Irvine United States abuf = arc_loan_buf(db->db_dnode->dn_objset->os_spa, blksz); 429c242f9a0Schunli zhang - Sun Microsystems - Irvine United States bcopy(db->db.db_data, abuf->b_data, blksz); 430c242f9a0Schunli zhang - Sun Microsystems - Irvine United States } else { 431c242f9a0Schunli zhang - Sun Microsystems - Irvine United States abuf = db->db_buf; 432c242f9a0Schunli zhang - Sun Microsystems - Irvine United States arc_loan_inuse_buf(abuf, db); 433c242f9a0Schunli zhang - Sun Microsystems - Irvine United States dbuf_set_data(db, NULL); 434c242f9a0Schunli zhang - Sun Microsystems - Irvine United States mutex_exit(&db->db_mtx); 435c242f9a0Schunli zhang - Sun Microsystems - Irvine United States } 436c242f9a0Schunli zhang - Sun Microsystems - Irvine United States return (abuf); 437c242f9a0Schunli zhang - Sun Microsystems - Irvine United States } 438c242f9a0Schunli zhang - Sun Microsystems - Irvine United States 439fa9e4066Sahrens uint64_t 440fa9e4066Sahrens dbuf_whichblock(dnode_t *dn, uint64_t offset) 441fa9e4066Sahrens { 442fa9e4066Sahrens if (dn->dn_datablkshift) { 443fa9e4066Sahrens return (offset >> dn->dn_datablkshift); 444fa9e4066Sahrens } else { 445fa9e4066Sahrens ASSERT3U(offset, <, dn->dn_datablksz); 446fa9e4066Sahrens return (0); 447fa9e4066Sahrens } 448fa9e4066Sahrens } 449fa9e4066Sahrens 450fa9e4066Sahrens static void 451fa9e4066Sahrens dbuf_read_done(zio_t *zio, arc_buf_t *buf, void *vdb) 452fa9e4066Sahrens { 453fa9e4066Sahrens dmu_buf_impl_t *db = vdb; 454fa9e4066Sahrens 455fa9e4066Sahrens mutex_enter(&db->db_mtx); 456fa9e4066Sahrens ASSERT3U(db->db_state, ==, DB_READ); 457fa9e4066Sahrens /* 458fa9e4066Sahrens * All reads are synchronous, so we must have a hold on the dbuf 459fa9e4066Sahrens */ 460fa9e4066Sahrens ASSERT(refcount_count(&db->db_holds) > 0); 461ea8dc4b6Seschrock ASSERT(db->db_buf == NULL); 462fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 463c717a561Smaybee if (db->db_level == 0 && db->db_freed_in_flight) { 464fa9e4066Sahrens /* we were freed in flight; disregard any error */ 465fa9e4066Sahrens arc_release(buf, db); 466fa9e4066Sahrens bzero(buf->b_data, db->db.db_size); 4676b4acc8bSahrens arc_buf_freeze(buf); 468c717a561Smaybee db->db_freed_in_flight = FALSE; 469fa9e4066Sahrens dbuf_set_data(db, buf); 470fa9e4066Sahrens db->db_state = DB_CACHED; 471fa9e4066Sahrens } else if (zio == NULL || zio->io_error == 0) { 472fa9e4066Sahrens dbuf_set_data(db, buf); 473fa9e4066Sahrens db->db_state = DB_CACHED; 474fa9e4066Sahrens } else { 475*0a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 476fa9e4066Sahrens ASSERT3P(db->db_buf, ==, NULL); 477ea8dc4b6Seschrock VERIFY(arc_buf_remove_ref(buf, db) == 1); 478ea8dc4b6Seschrock db->db_state = DB_UNCACHED; 479fa9e4066Sahrens } 480fa9e4066Sahrens cv_broadcast(&db->db_changed); 481fa9e4066Sahrens mutex_exit(&db->db_mtx); 482ea8dc4b6Seschrock dbuf_rele(db, NULL); 483fa9e4066Sahrens } 484fa9e4066Sahrens 485ea8dc4b6Seschrock static void 48613506d1eSmaybee dbuf_read_impl(dmu_buf_impl_t *db, zio_t *zio, uint32_t *flags) 487fa9e4066Sahrens { 488088f3894Sahrens dnode_t *dn = db->db_dnode; 489ea8dc4b6Seschrock zbookmark_t zb; 49013506d1eSmaybee uint32_t aflags = ARC_NOWAIT; 491088f3894Sahrens arc_buf_t *pbuf; 492fa9e4066Sahrens 493fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 494fa9e4066Sahrens /* We need the struct_rwlock to prevent db_blkptr from changing. */ 495088f3894Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 496ea8dc4b6Seschrock ASSERT(MUTEX_HELD(&db->db_mtx)); 497ea8dc4b6Seschrock ASSERT(db->db_state == DB_UNCACHED); 498ea8dc4b6Seschrock ASSERT(db->db_buf == NULL); 499fa9e4066Sahrens 500*0a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 501cf04dda1SMark Maybee int bonuslen = MIN(dn->dn_bonuslen, dn->dn_phys->dn_bonuslen); 5021934e92fSmaybee 5031934e92fSmaybee ASSERT3U(bonuslen, <=, db->db.db_size); 504ea8dc4b6Seschrock db->db.db_data = zio_buf_alloc(DN_MAX_BONUSLEN); 5055a98e54bSBrendan Gregg - Sun Microsystems arc_space_consume(DN_MAX_BONUSLEN, ARC_SPACE_OTHER); 5061934e92fSmaybee if (bonuslen < DN_MAX_BONUSLEN) 507ea8dc4b6Seschrock bzero(db->db.db_data, DN_MAX_BONUSLEN); 508cf04dda1SMark Maybee if (bonuslen) 509cf04dda1SMark Maybee bcopy(DN_BONUS(dn->dn_phys), db->db.db_data, bonuslen); 510ea8dc4b6Seschrock dbuf_update_data(db); 511fa9e4066Sahrens db->db_state = DB_CACHED; 512fa9e4066Sahrens mutex_exit(&db->db_mtx); 513fa9e4066Sahrens return; 514fa9e4066Sahrens } 515fa9e4066Sahrens 5161c8564a7SMark Maybee /* 5171c8564a7SMark Maybee * Recheck BP_IS_HOLE() after dnode_block_freed() in case dnode_sync() 5181c8564a7SMark Maybee * processes the delete record and clears the bp while we are waiting 5191c8564a7SMark Maybee * for the dn_mtx (resulting in a "no" from block_freed). 5201c8564a7SMark Maybee */ 521088f3894Sahrens if (db->db_blkptr == NULL || BP_IS_HOLE(db->db_blkptr) || 5221c8564a7SMark Maybee (db->db_level == 0 && (dnode_block_freed(dn, db->db_blkid) || 5231c8564a7SMark Maybee BP_IS_HOLE(db->db_blkptr)))) { 524ad23a2dbSjohansen arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 525ad23a2dbSjohansen 526088f3894Sahrens dbuf_set_data(db, arc_buf_alloc(dn->dn_objset->os_spa, 527ad23a2dbSjohansen db->db.db_size, db, type)); 528fa9e4066Sahrens bzero(db->db.db_data, db->db.db_size); 529fa9e4066Sahrens db->db_state = DB_CACHED; 53013506d1eSmaybee *flags |= DB_RF_CACHED; 531fa9e4066Sahrens mutex_exit(&db->db_mtx); 532fa9e4066Sahrens return; 533fa9e4066Sahrens } 534fa9e4066Sahrens 535fa9e4066Sahrens db->db_state = DB_READ; 536fa9e4066Sahrens mutex_exit(&db->db_mtx); 537fa9e4066Sahrens 5383baa08fcSek if (DBUF_IS_L2CACHEABLE(db)) 5393baa08fcSek aflags |= ARC_L2CACHE; 5403baa08fcSek 541b24ab676SJeff Bonwick SET_BOOKMARK(&zb, db->db_objset->os_dsl_dataset ? 542b24ab676SJeff Bonwick db->db_objset->os_dsl_dataset->ds_object : DMU_META_OBJSET, 543b24ab676SJeff Bonwick db->db.db_object, db->db_level, db->db_blkid); 544ea8dc4b6Seschrock 545ea8dc4b6Seschrock dbuf_add_ref(db, NULL); 546fa9e4066Sahrens /* ZIO_FLAG_CANFAIL callers have to check the parent zio's error */ 547088f3894Sahrens 548088f3894Sahrens if (db->db_parent) 549088f3894Sahrens pbuf = db->db_parent->db_buf; 550088f3894Sahrens else 551088f3894Sahrens pbuf = db->db_objset->os_phys_buf; 552088f3894Sahrens 553088f3894Sahrens (void) arc_read(zio, dn->dn_objset->os_spa, db->db_blkptr, pbuf, 554fa9e4066Sahrens dbuf_read_done, db, ZIO_PRIORITY_SYNC_READ, 55513506d1eSmaybee (*flags & DB_RF_CANFAIL) ? ZIO_FLAG_CANFAIL : ZIO_FLAG_MUSTSUCCEED, 55613506d1eSmaybee &aflags, &zb); 55713506d1eSmaybee if (aflags & ARC_CACHED) 55813506d1eSmaybee *flags |= DB_RF_CACHED; 559fa9e4066Sahrens } 560fa9e4066Sahrens 561ea8dc4b6Seschrock int 562ea8dc4b6Seschrock dbuf_read(dmu_buf_impl_t *db, zio_t *zio, uint32_t flags) 563fa9e4066Sahrens { 564ea8dc4b6Seschrock int err = 0; 565ea8dc4b6Seschrock int havepzio = (zio != NULL); 56613506d1eSmaybee int prefetch; 567fa9e4066Sahrens 568fa9e4066Sahrens /* 569fa9e4066Sahrens * We don't have to hold the mutex to check db_state because it 570fa9e4066Sahrens * can't be freed while we have a hold on the buffer. 571fa9e4066Sahrens */ 572fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 573fa9e4066Sahrens 57482c9918fSTim Haley if (db->db_state == DB_NOFILL) 57582c9918fSTim Haley return (EIO); 57682c9918fSTim Haley 577ea8dc4b6Seschrock if ((flags & DB_RF_HAVESTRUCT) == 0) 578ea8dc4b6Seschrock rw_enter(&db->db_dnode->dn_struct_rwlock, RW_READER); 579ea8dc4b6Seschrock 580*0a586ceaSMark Shellenbaum prefetch = db->db_level == 0 && db->db_blkid != DMU_BONUS_BLKID && 5813baa08fcSek (flags & DB_RF_NOPREFETCH) == 0 && db->db_dnode != NULL && 5823baa08fcSek DBUF_IS_CACHEABLE(db); 58313506d1eSmaybee 584ea8dc4b6Seschrock mutex_enter(&db->db_mtx); 585ea8dc4b6Seschrock if (db->db_state == DB_CACHED) { 586ea8dc4b6Seschrock mutex_exit(&db->db_mtx); 58713506d1eSmaybee if (prefetch) 58813506d1eSmaybee dmu_zfetch(&db->db_dnode->dn_zfetch, db->db.db_offset, 58913506d1eSmaybee db->db.db_size, TRUE); 590fa9e4066Sahrens if ((flags & DB_RF_HAVESTRUCT) == 0) 591ea8dc4b6Seschrock rw_exit(&db->db_dnode->dn_struct_rwlock); 592ea8dc4b6Seschrock } else if (db->db_state == DB_UNCACHED) { 593ea8dc4b6Seschrock if (zio == NULL) { 594ea8dc4b6Seschrock zio = zio_root(db->db_dnode->dn_objset->os_spa, 595ea8dc4b6Seschrock NULL, NULL, ZIO_FLAG_CANFAIL); 596ea8dc4b6Seschrock } 59713506d1eSmaybee dbuf_read_impl(db, zio, &flags); 59813506d1eSmaybee 599ea8dc4b6Seschrock /* dbuf_read_impl has dropped db_mtx for us */ 600ea8dc4b6Seschrock 60113506d1eSmaybee if (prefetch) 602ea8dc4b6Seschrock dmu_zfetch(&db->db_dnode->dn_zfetch, db->db.db_offset, 60313506d1eSmaybee db->db.db_size, flags & DB_RF_CACHED); 604ea8dc4b6Seschrock 605fa9e4066Sahrens if ((flags & DB_RF_HAVESTRUCT) == 0) 606fa9e4066Sahrens rw_exit(&db->db_dnode->dn_struct_rwlock); 607fa9e4066Sahrens 608ea8dc4b6Seschrock if (!havepzio) 609ea8dc4b6Seschrock err = zio_wait(zio); 610ea8dc4b6Seschrock } else { 61113506d1eSmaybee mutex_exit(&db->db_mtx); 61213506d1eSmaybee if (prefetch) 61313506d1eSmaybee dmu_zfetch(&db->db_dnode->dn_zfetch, db->db.db_offset, 61413506d1eSmaybee db->db.db_size, TRUE); 615ea8dc4b6Seschrock if ((flags & DB_RF_HAVESTRUCT) == 0) 616ea8dc4b6Seschrock rw_exit(&db->db_dnode->dn_struct_rwlock); 61713506d1eSmaybee 61813506d1eSmaybee mutex_enter(&db->db_mtx); 619ea8dc4b6Seschrock if ((flags & DB_RF_NEVERWAIT) == 0) { 620ea8dc4b6Seschrock while (db->db_state == DB_READ || 621ea8dc4b6Seschrock db->db_state == DB_FILL) { 622ea8dc4b6Seschrock ASSERT(db->db_state == DB_READ || 623ea8dc4b6Seschrock (flags & DB_RF_HAVESTRUCT) == 0); 624ea8dc4b6Seschrock cv_wait(&db->db_changed, &db->db_mtx); 625ea8dc4b6Seschrock } 626ea8dc4b6Seschrock if (db->db_state == DB_UNCACHED) 627ea8dc4b6Seschrock err = EIO; 628ea8dc4b6Seschrock } 629ea8dc4b6Seschrock mutex_exit(&db->db_mtx); 630fa9e4066Sahrens } 631fa9e4066Sahrens 632ea8dc4b6Seschrock ASSERT(err || havepzio || db->db_state == DB_CACHED); 633ea8dc4b6Seschrock return (err); 634fa9e4066Sahrens } 635fa9e4066Sahrens 636fa9e4066Sahrens static void 637fa9e4066Sahrens dbuf_noread(dmu_buf_impl_t *db) 638fa9e4066Sahrens { 639fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 640*0a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 641fa9e4066Sahrens mutex_enter(&db->db_mtx); 642fa9e4066Sahrens while (db->db_state == DB_READ || db->db_state == DB_FILL) 643fa9e4066Sahrens cv_wait(&db->db_changed, &db->db_mtx); 644fa9e4066Sahrens if (db->db_state == DB_UNCACHED) { 645ad23a2dbSjohansen arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 646ad23a2dbSjohansen 647ea8dc4b6Seschrock ASSERT(db->db_buf == NULL); 648fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 649fa9e4066Sahrens dbuf_set_data(db, arc_buf_alloc(db->db_dnode->dn_objset->os_spa, 650ad23a2dbSjohansen db->db.db_size, db, type)); 651fa9e4066Sahrens db->db_state = DB_FILL; 65282c9918fSTim Haley } else if (db->db_state == DB_NOFILL) { 65382c9918fSTim Haley dbuf_set_data(db, NULL); 654fa9e4066Sahrens } else { 655fa9e4066Sahrens ASSERT3U(db->db_state, ==, DB_CACHED); 656fa9e4066Sahrens } 657fa9e4066Sahrens mutex_exit(&db->db_mtx); 658fa9e4066Sahrens } 659fa9e4066Sahrens 660fa9e4066Sahrens /* 661fa9e4066Sahrens * This is our just-in-time copy function. It makes a copy of 662fa9e4066Sahrens * buffers, that have been modified in a previous transaction 663fa9e4066Sahrens * group, before we modify them in the current active group. 664fa9e4066Sahrens * 665fa9e4066Sahrens * This function is used in two places: when we are dirtying a 666fa9e4066Sahrens * buffer for the first time in a txg, and when we are freeing 667fa9e4066Sahrens * a range in a dnode that includes this buffer. 668fa9e4066Sahrens * 669fa9e4066Sahrens * Note that when we are called from dbuf_free_range() we do 670fa9e4066Sahrens * not put a hold on the buffer, we just traverse the active 671fa9e4066Sahrens * dbuf list for the dnode. 672fa9e4066Sahrens */ 673fa9e4066Sahrens static void 674fa9e4066Sahrens dbuf_fix_old_data(dmu_buf_impl_t *db, uint64_t txg) 675fa9e4066Sahrens { 676c717a561Smaybee dbuf_dirty_record_t *dr = db->db_last_dirty; 677fa9e4066Sahrens 678fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 679fa9e4066Sahrens ASSERT(db->db.db_data != NULL); 680c717a561Smaybee ASSERT(db->db_level == 0); 681c717a561Smaybee ASSERT(db->db.db_object != DMU_META_DNODE_OBJECT); 682fa9e4066Sahrens 6834d31c452Smaybee if (dr == NULL || 6844d31c452Smaybee (dr->dt.dl.dr_data != 685*0a586ceaSMark Shellenbaum ((db->db_blkid == DMU_BONUS_BLKID) ? db->db.db_data : db->db_buf))) 686fa9e4066Sahrens return; 687fa9e4066Sahrens 688fa9e4066Sahrens /* 689c717a561Smaybee * If the last dirty record for this dbuf has not yet synced 690c717a561Smaybee * and its referencing the dbuf data, either: 691c717a561Smaybee * reset the reference to point to a new copy, 692c717a561Smaybee * or (if there a no active holders) 693c717a561Smaybee * just null out the current db_data pointer. 694fa9e4066Sahrens */ 695c717a561Smaybee ASSERT(dr->dr_txg >= txg - 2); 696*0a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 697c717a561Smaybee /* Note that the data bufs here are zio_bufs */ 698c717a561Smaybee dr->dt.dl.dr_data = zio_buf_alloc(DN_MAX_BONUSLEN); 6995a98e54bSBrendan Gregg - Sun Microsystems arc_space_consume(DN_MAX_BONUSLEN, ARC_SPACE_OTHER); 700c717a561Smaybee bcopy(db->db.db_data, dr->dt.dl.dr_data, DN_MAX_BONUSLEN); 701c717a561Smaybee } else if (refcount_count(&db->db_holds) > db->db_dirtycnt) { 702c717a561Smaybee int size = db->db.db_size; 703c717a561Smaybee arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 704c717a561Smaybee dr->dt.dl.dr_data = arc_buf_alloc( 705c717a561Smaybee db->db_dnode->dn_objset->os_spa, size, db, type); 706c717a561Smaybee bcopy(db->db.db_data, dr->dt.dl.dr_data->b_data, size); 707c717a561Smaybee } else { 708c717a561Smaybee dbuf_set_data(db, NULL); 709fa9e4066Sahrens } 710fa9e4066Sahrens } 711fa9e4066Sahrens 712c717a561Smaybee void 713c717a561Smaybee dbuf_unoverride(dbuf_dirty_record_t *dr) 714ea8dc4b6Seschrock { 715c717a561Smaybee dmu_buf_impl_t *db = dr->dr_dbuf; 716b24ab676SJeff Bonwick blkptr_t *bp = &dr->dt.dl.dr_overridden_by; 717c717a561Smaybee uint64_t txg = dr->dr_txg; 718ea8dc4b6Seschrock 719ea8dc4b6Seschrock ASSERT(MUTEX_HELD(&db->db_mtx)); 720c717a561Smaybee ASSERT(dr->dt.dl.dr_override_state != DR_IN_DMU_SYNC); 721c717a561Smaybee ASSERT(db->db_level == 0); 722ea8dc4b6Seschrock 723*0a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID || 724c717a561Smaybee dr->dt.dl.dr_override_state == DR_NOT_OVERRIDDEN) 725c717a561Smaybee return; 726ea8dc4b6Seschrock 727b24ab676SJeff Bonwick ASSERT(db->db_data_pending != dr); 728b24ab676SJeff Bonwick 729c717a561Smaybee /* free this block */ 730b24ab676SJeff Bonwick if (!BP_IS_HOLE(bp)) 731b24ab676SJeff Bonwick dsl_free(spa_get_dsl(db->db_dnode->dn_objset->os_spa), txg, bp); 732b24ab676SJeff Bonwick 733c717a561Smaybee dr->dt.dl.dr_override_state = DR_NOT_OVERRIDDEN; 734c717a561Smaybee /* 735c717a561Smaybee * Release the already-written buffer, so we leave it in 736c717a561Smaybee * a consistent dirty state. Note that all callers are 737c717a561Smaybee * modifying the buffer, so they will immediately do 738c717a561Smaybee * another (redundant) arc_release(). Therefore, leave 739c717a561Smaybee * the buf thawed to save the effort of freezing & 740c717a561Smaybee * immediately re-thawing it. 741c717a561Smaybee */ 742c717a561Smaybee arc_release(dr->dt.dl.dr_data, db); 743fa9e4066Sahrens } 744fa9e4066Sahrens 745cdb0ab79Smaybee /* 746cdb0ab79Smaybee * Evict (if its unreferenced) or clear (if its referenced) any level-0 747cdb0ab79Smaybee * data blocks in the free range, so that any future readers will find 748cdb0ab79Smaybee * empty blocks. Also, if we happen accross any level-1 dbufs in the 749cdb0ab79Smaybee * range that have not already been marked dirty, mark them dirty so 750cdb0ab79Smaybee * they stay in memory. 751cdb0ab79Smaybee */ 752fa9e4066Sahrens void 753cdb0ab79Smaybee dbuf_free_range(dnode_t *dn, uint64_t start, uint64_t end, dmu_tx_t *tx) 754fa9e4066Sahrens { 755fa9e4066Sahrens dmu_buf_impl_t *db, *db_next; 756fa9e4066Sahrens uint64_t txg = tx->tx_txg; 757cdb0ab79Smaybee int epbs = dn->dn_indblkshift - SPA_BLKPTRSHIFT; 758cdb0ab79Smaybee uint64_t first_l1 = start >> epbs; 759cdb0ab79Smaybee uint64_t last_l1 = end >> epbs; 760fa9e4066Sahrens 761*0a586ceaSMark Shellenbaum if (end > dn->dn_maxblkid && (end != DMU_SPILL_BLKID)) { 762cdb0ab79Smaybee end = dn->dn_maxblkid; 763cdb0ab79Smaybee last_l1 = end >> epbs; 764cdb0ab79Smaybee } 765cdb0ab79Smaybee dprintf_dnode(dn, "start=%llu end=%llu\n", start, end); 766fa9e4066Sahrens mutex_enter(&dn->dn_dbufs_mtx); 767fa9e4066Sahrens for (db = list_head(&dn->dn_dbufs); db; db = db_next) { 768fa9e4066Sahrens db_next = list_next(&dn->dn_dbufs, db); 769*0a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 770cdb0ab79Smaybee 771cdb0ab79Smaybee if (db->db_level == 1 && 772cdb0ab79Smaybee db->db_blkid >= first_l1 && db->db_blkid <= last_l1) { 773cdb0ab79Smaybee mutex_enter(&db->db_mtx); 774cdb0ab79Smaybee if (db->db_last_dirty && 775cdb0ab79Smaybee db->db_last_dirty->dr_txg < txg) { 776cdb0ab79Smaybee dbuf_add_ref(db, FTAG); 777cdb0ab79Smaybee mutex_exit(&db->db_mtx); 778cdb0ab79Smaybee dbuf_will_dirty(db, tx); 779cdb0ab79Smaybee dbuf_rele(db, FTAG); 780cdb0ab79Smaybee } else { 781cdb0ab79Smaybee mutex_exit(&db->db_mtx); 782cdb0ab79Smaybee } 783cdb0ab79Smaybee } 784cdb0ab79Smaybee 785ea8dc4b6Seschrock if (db->db_level != 0) 786fa9e4066Sahrens continue; 787fa9e4066Sahrens dprintf_dbuf(db, "found buf %s\n", ""); 788cdb0ab79Smaybee if (db->db_blkid < start || db->db_blkid > end) 789fa9e4066Sahrens continue; 790fa9e4066Sahrens 791fa9e4066Sahrens /* found a level 0 buffer in the range */ 792fa9e4066Sahrens if (dbuf_undirty(db, tx)) 793fa9e4066Sahrens continue; 794fa9e4066Sahrens 795fa9e4066Sahrens mutex_enter(&db->db_mtx); 796ea8dc4b6Seschrock if (db->db_state == DB_UNCACHED || 79782c9918fSTim Haley db->db_state == DB_NOFILL || 798ea8dc4b6Seschrock db->db_state == DB_EVICTING) { 799fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 800fa9e4066Sahrens mutex_exit(&db->db_mtx); 801fa9e4066Sahrens continue; 802fa9e4066Sahrens } 803c543ec06Sahrens if (db->db_state == DB_READ || db->db_state == DB_FILL) { 804c543ec06Sahrens /* will be handled in dbuf_read_done or dbuf_rele */ 805c717a561Smaybee db->db_freed_in_flight = TRUE; 806fa9e4066Sahrens mutex_exit(&db->db_mtx); 807fa9e4066Sahrens continue; 808fa9e4066Sahrens } 809ea8dc4b6Seschrock if (refcount_count(&db->db_holds) == 0) { 810ea8dc4b6Seschrock ASSERT(db->db_buf); 811ea8dc4b6Seschrock dbuf_clear(db); 812ea8dc4b6Seschrock continue; 813ea8dc4b6Seschrock } 814c717a561Smaybee /* The dbuf is referenced */ 815fa9e4066Sahrens 816c717a561Smaybee if (db->db_last_dirty != NULL) { 817c717a561Smaybee dbuf_dirty_record_t *dr = db->db_last_dirty; 818c717a561Smaybee 819c717a561Smaybee if (dr->dr_txg == txg) { 82044eda4d7Smaybee /* 821c717a561Smaybee * This buffer is "in-use", re-adjust the file 822c717a561Smaybee * size to reflect that this buffer may 823c717a561Smaybee * contain new data when we sync. 82444eda4d7Smaybee */ 825c717a561Smaybee if (db->db_blkid > dn->dn_maxblkid) 826c717a561Smaybee 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 } 837ea8dc4b6Seschrock } 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 883*0a586ceaSMark 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) 908f65e61c0Sahrens 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)); 9369c9dc39aSek 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 980*0a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) 981*0a586ceaSMark Shellenbaum dn->dn_have_spill = B_TRUE; 982*0a586ceaSMark 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) { 992*0a586ceaSMark 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) 1000c717a561Smaybee 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 1033*0a586ceaSMark 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) { 1055*0a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 105682c9918fSTim Haley dbuf_fix_old_data(db, tx->tx_txg); 105782c9918fSTim Haley data_old = db->db.db_data; 105882c9918fSTim Haley } else if (db->db.db_object != DMU_META_DNODE_OBJECT) { 105982c9918fSTim Haley /* 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). 106782c9918fSTim Haley */ 106882c9918fSTim Haley arc_release(db->db_buf, db); 106982c9918fSTim Haley dbuf_fix_old_data(db, tx->tx_txg); 107082c9918fSTim Haley data_old = db->db_buf; 107182c9918fSTim Haley } 107282c9918fSTim Haley ASSERT(data_old != NULL); 1073fa9e4066Sahrens } 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 */ 1091*0a586ceaSMark Shellenbaum if (db->db_level == 0 && db->db_blkid != DMU_BONUS_BLKID && 1092*0a586ceaSMark Shellenbaum db->db_blkid != DMU_SPILL_BLKID) { 1093c717a561Smaybee mutex_enter(&dn->dn_mtx); 1094fa9e4066Sahrens dnode_clear_range(dn, db->db_blkid, 1, tx); 1095c717a561Smaybee mutex_exit(&dn->dn_mtx); 1096c717a561Smaybee db->db_freed_in_flight = FALSE; 1097fa9e4066Sahrens } 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 1108*0a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID || 1109*0a586ceaSMark 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) { 1147c717a561Smaybee int epbs = dn->dn_indblkshift - SPA_BLKPTRSHIFT; 1148c717a561Smaybee 1149c717a561Smaybee parent = dbuf_hold_level(dn, db->db_level+1, 1150c717a561Smaybee 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) 1158c717a561Smaybee 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); 1197*0a586ceaSMark 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); 1242c717a561Smaybee mutex_enter(&dn->dn_mtx); 1243c717a561Smaybee list_remove(&dn->dn_dirty_records[txg & TXG_MASK], dr); 1244c717a561Smaybee mutex_exit(&dn->dn_mtx); 1245c717a561Smaybee } 1246c717a561Smaybee 1247c717a561Smaybee if (db->db_level == 0) { 124882c9918fSTim Haley if (db->db_state != DB_NOFILL) { 124982c9918fSTim Haley dbuf_unoverride(dr); 1250c717a561Smaybee 125182c9918fSTim Haley ASSERT(db->db_buf != NULL); 125282c9918fSTim Haley ASSERT(dr->dt.dl.dr_data != NULL); 125382c9918fSTim Haley 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); 1260c25056deSgw mutex_destroy(&dr->dt.di.dr_mtx); 1261c25056deSgw 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 129782c9918fSTim Haley 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 1307fa9e4066Sahrens 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 1312*0a586ceaSMark 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); 13309c9dc39aSek DBUF_VERIFY(db); 1331fa9e4066Sahrens 1332fa9e4066Sahrens if (db->db_state == DB_FILL) { 1333c717a561Smaybee if (db->db_level == 0 && db->db_freed_in_flight) { 1334*0a586ceaSMark 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 13462fdbea25SAleksandr Guzovskiy /* 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); 1355*0a586ceaSMark 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 1410ea8dc4b6Seschrock /* 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); 1438*0a586ceaSMark 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 1452*0a586ceaSMark 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) 1462ea8dc4b6Seschrock 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 1481*0a586ceaSMark Shellenbaum ASSERT(blkid != DMU_BONUS_BLKID); 1482*0a586ceaSMark Shellenbaum 1483*0a586ceaSMark Shellenbaum if (blkid == DMU_SPILL_BLKID) { 1484*0a586ceaSMark Shellenbaum mutex_enter(&dn->dn_mtx); 1485*0a586ceaSMark Shellenbaum if (dn->dn_phys->dn_flags & DNODE_FLAG_SPILL_BLKPTR) 1486*0a586ceaSMark Shellenbaum *bpp = &dn->dn_phys->dn_spill; 1487*0a586ceaSMark Shellenbaum else 1488*0a586ceaSMark Shellenbaum *bpp = NULL; 1489*0a586ceaSMark Shellenbaum dbuf_add_ref(dn->dn_dbuf, NULL); 1490*0a586ceaSMark Shellenbaum *parentp = dn->dn_dbuf; 1491*0a586ceaSMark Shellenbaum mutex_exit(&dn->dn_mtx); 1492*0a586ceaSMark Shellenbaum return (0); 1493*0a586ceaSMark Shellenbaum } 1494ea8dc4b6Seschrock 1495fa9e4066Sahrens if (dn->dn_phys->dn_nlevels == 0) 1496fa9e4066Sahrens nlevels = 1; 1497fa9e4066Sahrens else 1498fa9e4066Sahrens nlevels = dn->dn_phys->dn_nlevels; 1499fa9e4066Sahrens 1500fa9e4066Sahrens epbs = dn->dn_indblkshift - SPA_BLKPTRSHIFT; 1501fa9e4066Sahrens 1502fa9e4066Sahrens ASSERT3U(level * epbs, <, 64); 1503fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 1504ea8dc4b6Seschrock if (level >= nlevels || 1505fa9e4066Sahrens (blkid > (dn->dn_phys->dn_maxblkid >> (level * epbs)))) { 1506fa9e4066Sahrens /* the buffer has no parent yet */ 1507fa9e4066Sahrens return (ENOENT); 1508fa9e4066Sahrens } else if (level < nlevels-1) { 1509fa9e4066Sahrens /* this block is referenced from an indirect block */ 1510fa9e4066Sahrens int err = dbuf_hold_impl(dn, level+1, 1511fa9e4066Sahrens blkid >> epbs, fail_sparse, NULL, parentp); 1512fa9e4066Sahrens if (err) 1513fa9e4066Sahrens return (err); 1514ea8dc4b6Seschrock err = dbuf_read(*parentp, NULL, 1515ea8dc4b6Seschrock (DB_RF_HAVESTRUCT | DB_RF_NOPREFETCH | DB_RF_CANFAIL)); 1516c543ec06Sahrens if (err) { 1517c543ec06Sahrens dbuf_rele(*parentp, NULL); 1518c543ec06Sahrens *parentp = NULL; 1519c543ec06Sahrens return (err); 1520ea8dc4b6Seschrock } 1521c543ec06Sahrens *bpp = ((blkptr_t *)(*parentp)->db.db_data) + 1522c543ec06Sahrens (blkid & ((1ULL << epbs) - 1)); 1523c543ec06Sahrens return (0); 1524fa9e4066Sahrens } else { 1525fa9e4066Sahrens /* the block is referenced from the dnode */ 1526fa9e4066Sahrens ASSERT3U(level, ==, nlevels-1); 1527fa9e4066Sahrens ASSERT(dn->dn_phys->dn_nblkptr == 0 || 1528fa9e4066Sahrens blkid < dn->dn_phys->dn_nblkptr); 1529c543ec06Sahrens if (dn->dn_dbuf) { 1530c543ec06Sahrens dbuf_add_ref(dn->dn_dbuf, NULL); 1531c543ec06Sahrens *parentp = dn->dn_dbuf; 1532c543ec06Sahrens } 1533fa9e4066Sahrens *bpp = &dn->dn_phys->dn_blkptr[blkid]; 1534fa9e4066Sahrens return (0); 1535fa9e4066Sahrens } 1536fa9e4066Sahrens } 1537fa9e4066Sahrens 1538fa9e4066Sahrens static dmu_buf_impl_t * 1539fa9e4066Sahrens dbuf_create(dnode_t *dn, uint8_t level, uint64_t blkid, 1540fa9e4066Sahrens dmu_buf_impl_t *parent, blkptr_t *blkptr) 1541fa9e4066Sahrens { 1542503ad85cSMatthew Ahrens objset_t *os = dn->dn_objset; 1543fa9e4066Sahrens dmu_buf_impl_t *db, *odb; 1544fa9e4066Sahrens 1545fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 1546fa9e4066Sahrens ASSERT(dn->dn_type != DMU_OT_NONE); 1547fa9e4066Sahrens 1548fa9e4066Sahrens db = kmem_cache_alloc(dbuf_cache, KM_SLEEP); 1549fa9e4066Sahrens 1550fa9e4066Sahrens db->db_objset = os; 1551fa9e4066Sahrens db->db.db_object = dn->dn_object; 1552fa9e4066Sahrens db->db_level = level; 1553fa9e4066Sahrens db->db_blkid = blkid; 1554c717a561Smaybee db->db_last_dirty = NULL; 1555ea8dc4b6Seschrock db->db_dirtycnt = 0; 1556ea8dc4b6Seschrock db->db_dnode = dn; 1557ea8dc4b6Seschrock db->db_parent = parent; 1558ea8dc4b6Seschrock db->db_blkptr = blkptr; 1559fa9e4066Sahrens 1560c717a561Smaybee db->db_user_ptr = NULL; 1561c717a561Smaybee db->db_user_data_ptr_ptr = NULL; 1562c717a561Smaybee db->db_evict_func = NULL; 1563c717a561Smaybee db->db_immediate_evict = 0; 1564c717a561Smaybee db->db_freed_in_flight = 0; 1565ea8dc4b6Seschrock 1566*0a586ceaSMark Shellenbaum if (blkid == DMU_BONUS_BLKID) { 1567ea8dc4b6Seschrock ASSERT3P(parent, ==, dn->dn_dbuf); 15681934e92fSmaybee db->db.db_size = DN_MAX_BONUSLEN - 15691934e92fSmaybee (dn->dn_nblkptr-1) * sizeof (blkptr_t); 15701934e92fSmaybee ASSERT3U(db->db.db_size, >=, dn->dn_bonuslen); 1571*0a586ceaSMark Shellenbaum db->db.db_offset = DMU_BONUS_BLKID; 1572ea8dc4b6Seschrock db->db_state = DB_UNCACHED; 1573ea8dc4b6Seschrock /* the bonus dbuf is not placed in the hash table */ 15745a98e54bSBrendan Gregg - Sun Microsystems arc_space_consume(sizeof (dmu_buf_impl_t), ARC_SPACE_OTHER); 1575ea8dc4b6Seschrock return (db); 1576*0a586ceaSMark Shellenbaum } else if (blkid == DMU_SPILL_BLKID) { 1577*0a586ceaSMark Shellenbaum db->db.db_size = (blkptr != NULL) ? 1578*0a586ceaSMark Shellenbaum BP_GET_LSIZE(blkptr) : SPA_MINBLOCKSIZE; 1579*0a586ceaSMark Shellenbaum db->db.db_offset = 0; 1580fa9e4066Sahrens } else { 1581fa9e4066Sahrens int blocksize = 1582fa9e4066Sahrens db->db_level ? 1<<dn->dn_indblkshift : dn->dn_datablksz; 1583fa9e4066Sahrens db->db.db_size = blocksize; 1584fa9e4066Sahrens db->db.db_offset = db->db_blkid * blocksize; 1585fa9e4066Sahrens } 1586fa9e4066Sahrens 1587fa9e4066Sahrens /* 1588fa9e4066Sahrens * Hold the dn_dbufs_mtx while we get the new dbuf 1589fa9e4066Sahrens * in the hash table *and* added to the dbufs list. 1590fa9e4066Sahrens * This prevents a possible deadlock with someone 1591fa9e4066Sahrens * trying to look up this dbuf before its added to the 1592fa9e4066Sahrens * dn_dbufs list. 1593fa9e4066Sahrens */ 1594fa9e4066Sahrens mutex_enter(&dn->dn_dbufs_mtx); 1595ea8dc4b6Seschrock db->db_state = DB_EVICTING; 1596fa9e4066Sahrens if ((odb = dbuf_hash_insert(db)) != NULL) { 1597fa9e4066Sahrens /* someone else inserted it first */ 1598fa9e4066Sahrens kmem_cache_free(dbuf_cache, db); 1599fa9e4066Sahrens mutex_exit(&dn->dn_dbufs_mtx); 1600fa9e4066Sahrens return (odb); 1601fa9e4066Sahrens } 1602fa9e4066Sahrens list_insert_head(&dn->dn_dbufs, db); 1603ea8dc4b6Seschrock db->db_state = DB_UNCACHED; 1604fa9e4066Sahrens mutex_exit(&dn->dn_dbufs_mtx); 16055a98e54bSBrendan Gregg - Sun Microsystems arc_space_consume(sizeof (dmu_buf_impl_t), ARC_SPACE_OTHER); 1606fa9e4066Sahrens 1607fa9e4066Sahrens if (parent && parent != dn->dn_dbuf) 1608fa9e4066Sahrens dbuf_add_ref(parent, db); 1609fa9e4066Sahrens 1610ea8dc4b6Seschrock ASSERT(dn->dn_object == DMU_META_DNODE_OBJECT || 1611ea8dc4b6Seschrock refcount_count(&dn->dn_holds) > 0); 1612fa9e4066Sahrens (void) refcount_add(&dn->dn_holds, db); 1613fa9e4066Sahrens 1614fa9e4066Sahrens dprintf_dbuf(db, "db=%p\n", db); 1615fa9e4066Sahrens 1616fa9e4066Sahrens return (db); 1617fa9e4066Sahrens } 1618fa9e4066Sahrens 1619fa9e4066Sahrens static int 1620ea8dc4b6Seschrock dbuf_do_evict(void *private) 1621fa9e4066Sahrens { 1622ea8dc4b6Seschrock arc_buf_t *buf = private; 1623ea8dc4b6Seschrock dmu_buf_impl_t *db = buf->b_private; 1624fa9e4066Sahrens 1625ea8dc4b6Seschrock if (!MUTEX_HELD(&db->db_mtx)) 1626ea8dc4b6Seschrock mutex_enter(&db->db_mtx); 1627fa9e4066Sahrens 1628ea8dc4b6Seschrock ASSERT(refcount_is_zero(&db->db_holds)); 1629fa9e4066Sahrens 1630ea8dc4b6Seschrock if (db->db_state != DB_EVICTING) { 1631ea8dc4b6Seschrock ASSERT(db->db_state == DB_CACHED); 1632ea8dc4b6Seschrock DBUF_VERIFY(db); 1633ea8dc4b6Seschrock db->db_buf = NULL; 1634ea8dc4b6Seschrock dbuf_evict(db); 1635ea8dc4b6Seschrock } else { 1636ea8dc4b6Seschrock mutex_exit(&db->db_mtx); 1637ea8dc4b6Seschrock dbuf_destroy(db); 1638fa9e4066Sahrens } 1639ea8dc4b6Seschrock return (0); 1640fa9e4066Sahrens } 1641fa9e4066Sahrens 1642fa9e4066Sahrens static void 1643fa9e4066Sahrens dbuf_destroy(dmu_buf_impl_t *db) 1644fa9e4066Sahrens { 1645fa9e4066Sahrens ASSERT(refcount_is_zero(&db->db_holds)); 1646fa9e4066Sahrens 1647*0a586ceaSMark Shellenbaum if (db->db_blkid != DMU_BONUS_BLKID) { 1648ea8dc4b6Seschrock /* 1649ea8dc4b6Seschrock * If this dbuf is still on the dn_dbufs list, 1650ea8dc4b6Seschrock * remove it from that list. 1651ea8dc4b6Seschrock */ 16521934e92fSmaybee if (db->db_dnode) { 16531934e92fSmaybee dnode_t *dn = db->db_dnode; 16541934e92fSmaybee 16551934e92fSmaybee mutex_enter(&dn->dn_dbufs_mtx); 1656ea8dc4b6Seschrock list_remove(&dn->dn_dbufs, db); 1657c543ec06Sahrens mutex_exit(&dn->dn_dbufs_mtx); 1658ea8dc4b6Seschrock 1659ea8dc4b6Seschrock dnode_rele(dn, db); 16601934e92fSmaybee db->db_dnode = NULL; 1661ea8dc4b6Seschrock } 1662ea8dc4b6Seschrock dbuf_hash_remove(db); 1663ea8dc4b6Seschrock } 1664ea8dc4b6Seschrock db->db_parent = NULL; 1665ea8dc4b6Seschrock db->db_buf = NULL; 1666ea8dc4b6Seschrock 1667f82bfe17Sgw ASSERT(!list_link_active(&db->db_link)); 1668fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 1669fa9e4066Sahrens ASSERT(db->db_hash_next == NULL); 1670fa9e4066Sahrens ASSERT(db->db_blkptr == NULL); 1671fa9e4066Sahrens ASSERT(db->db_data_pending == NULL); 1672fa9e4066Sahrens 1673fa9e4066Sahrens kmem_cache_free(dbuf_cache, db); 16745a98e54bSBrendan Gregg - Sun Microsystems arc_space_return(sizeof (dmu_buf_impl_t), ARC_SPACE_OTHER); 1675fa9e4066Sahrens } 1676fa9e4066Sahrens 1677fa9e4066Sahrens void 1678fa9e4066Sahrens dbuf_prefetch(dnode_t *dn, uint64_t blkid) 1679fa9e4066Sahrens { 168013506d1eSmaybee dmu_buf_impl_t *db = NULL; 1681fa9e4066Sahrens blkptr_t *bp = NULL; 1682fa9e4066Sahrens 1683*0a586ceaSMark Shellenbaum ASSERT(blkid != DMU_BONUS_BLKID); 1684fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 1685fa9e4066Sahrens 1686fa9e4066Sahrens if (dnode_block_freed(dn, blkid)) 1687fa9e4066Sahrens return; 1688fa9e4066Sahrens 1689fa9e4066Sahrens /* dbuf_find() returns with db_mtx held */ 1690fa9e4066Sahrens if (db = dbuf_find(dn, 0, blkid)) { 169113506d1eSmaybee if (refcount_count(&db->db_holds) > 0) { 169213506d1eSmaybee /* 169313506d1eSmaybee * This dbuf is active. We assume that it is 169413506d1eSmaybee * already CACHED, or else about to be either 169513506d1eSmaybee * read or filled. 169613506d1eSmaybee */ 169713506d1eSmaybee mutex_exit(&db->db_mtx); 169813506d1eSmaybee return; 169913506d1eSmaybee } 1700fa9e4066Sahrens mutex_exit(&db->db_mtx); 17010b69c2f0Sahrens db = NULL; 1702fa9e4066Sahrens } 1703fa9e4066Sahrens 170413506d1eSmaybee if (dbuf_findbp(dn, 0, blkid, TRUE, &db, &bp) == 0) { 1705fa9e4066Sahrens if (bp && !BP_IS_HOLE(bp)) { 1706088f3894Sahrens arc_buf_t *pbuf; 1707b24ab676SJeff Bonwick dsl_dataset_t *ds = dn->dn_objset->os_dsl_dataset; 170813506d1eSmaybee uint32_t aflags = ARC_NOWAIT | ARC_PREFETCH; 1709ea8dc4b6Seschrock zbookmark_t zb; 1710b24ab676SJeff Bonwick 1711b24ab676SJeff Bonwick SET_BOOKMARK(&zb, ds ? ds->ds_object : DMU_META_OBJSET, 1712b24ab676SJeff Bonwick dn->dn_object, 0, blkid); 1713ea8dc4b6Seschrock 1714088f3894Sahrens if (db) 1715088f3894Sahrens pbuf = db->db_buf; 1716088f3894Sahrens else 1717088f3894Sahrens pbuf = dn->dn_objset->os_phys_buf; 1718088f3894Sahrens 1719088f3894Sahrens (void) arc_read(NULL, dn->dn_objset->os_spa, 1720088f3894Sahrens bp, pbuf, NULL, NULL, ZIO_PRIORITY_ASYNC_READ, 1721fa9e4066Sahrens ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE, 172213506d1eSmaybee &aflags, &zb); 1723fa9e4066Sahrens } 172413506d1eSmaybee if (db) 172513506d1eSmaybee dbuf_rele(db, NULL); 1726fa9e4066Sahrens } 1727fa9e4066Sahrens } 1728fa9e4066Sahrens 1729fa9e4066Sahrens /* 1730fa9e4066Sahrens * Returns with db_holds incremented, and db_mtx not held. 1731fa9e4066Sahrens * Note: dn_struct_rwlock must be held. 1732fa9e4066Sahrens */ 1733fa9e4066Sahrens int 1734fa9e4066Sahrens dbuf_hold_impl(dnode_t *dn, uint8_t level, uint64_t blkid, int fail_sparse, 1735fa9e4066Sahrens void *tag, dmu_buf_impl_t **dbp) 1736fa9e4066Sahrens { 1737fa9e4066Sahrens dmu_buf_impl_t *db, *parent = NULL; 1738fa9e4066Sahrens 1739*0a586ceaSMark Shellenbaum ASSERT(blkid != DMU_BONUS_BLKID); 1740fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 1741fa9e4066Sahrens ASSERT3U(dn->dn_nlevels, >, level); 1742fa9e4066Sahrens 1743fa9e4066Sahrens *dbp = NULL; 1744ea8dc4b6Seschrock top: 1745fa9e4066Sahrens /* dbuf_find() returns with db_mtx held */ 1746fa9e4066Sahrens db = dbuf_find(dn, level, blkid); 1747fa9e4066Sahrens 1748fa9e4066Sahrens if (db == NULL) { 1749fa9e4066Sahrens blkptr_t *bp = NULL; 1750fa9e4066Sahrens int err; 1751fa9e4066Sahrens 1752c543ec06Sahrens ASSERT3P(parent, ==, NULL); 1753fa9e4066Sahrens err = dbuf_findbp(dn, level, blkid, fail_sparse, &parent, &bp); 1754fa9e4066Sahrens if (fail_sparse) { 1755fa9e4066Sahrens if (err == 0 && bp && BP_IS_HOLE(bp)) 1756fa9e4066Sahrens err = ENOENT; 1757fa9e4066Sahrens if (err) { 1758c543ec06Sahrens if (parent) 1759ea8dc4b6Seschrock dbuf_rele(parent, NULL); 1760fa9e4066Sahrens return (err); 1761fa9e4066Sahrens } 1762fa9e4066Sahrens } 1763ea8dc4b6Seschrock if (err && err != ENOENT) 1764ea8dc4b6Seschrock return (err); 1765fa9e4066Sahrens db = dbuf_create(dn, level, blkid, parent, bp); 1766fa9e4066Sahrens } 1767fa9e4066Sahrens 1768ea8dc4b6Seschrock if (db->db_buf && refcount_is_zero(&db->db_holds)) { 1769ea8dc4b6Seschrock arc_buf_add_ref(db->db_buf, db); 1770ea8dc4b6Seschrock if (db->db_buf->b_data == NULL) { 1771ea8dc4b6Seschrock dbuf_clear(db); 1772c543ec06Sahrens if (parent) { 1773c543ec06Sahrens dbuf_rele(parent, NULL); 1774c543ec06Sahrens parent = NULL; 1775c543ec06Sahrens } 1776ea8dc4b6Seschrock goto top; 1777ea8dc4b6Seschrock } 1778ea8dc4b6Seschrock ASSERT3P(db->db.db_data, ==, db->db_buf->b_data); 1779ea8dc4b6Seschrock } 1780ea8dc4b6Seschrock 1781ea8dc4b6Seschrock ASSERT(db->db_buf == NULL || arc_referenced(db->db_buf)); 1782ea8dc4b6Seschrock 1783fa9e4066Sahrens /* 1784c717a561Smaybee * If this buffer is currently syncing out, and we are are 1785c717a561Smaybee * still referencing it from db_data, we need to make a copy 1786c717a561Smaybee * of it in case we decide we want to dirty it again in this txg. 1787fa9e4066Sahrens */ 1788*0a586ceaSMark Shellenbaum if (db->db_level == 0 && db->db_blkid != DMU_BONUS_BLKID && 1789ea8dc4b6Seschrock dn->dn_object != DMU_META_DNODE_OBJECT && 1790c717a561Smaybee db->db_state == DB_CACHED && db->db_data_pending) { 1791c717a561Smaybee dbuf_dirty_record_t *dr = db->db_data_pending; 1792fa9e4066Sahrens 1793c717a561Smaybee if (dr->dt.dl.dr_data == db->db_buf) { 1794c717a561Smaybee arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 1795c717a561Smaybee 1796c717a561Smaybee dbuf_set_data(db, 1797c717a561Smaybee arc_buf_alloc(db->db_dnode->dn_objset->os_spa, 1798c717a561Smaybee db->db.db_size, db, type)); 1799c717a561Smaybee bcopy(dr->dt.dl.dr_data->b_data, db->db.db_data, 1800c717a561Smaybee db->db.db_size); 1801c717a561Smaybee } 1802fa9e4066Sahrens } 1803fa9e4066Sahrens 1804ea8dc4b6Seschrock (void) refcount_add(&db->db_holds, tag); 1805fa9e4066Sahrens dbuf_update_data(db); 18069c9dc39aSek DBUF_VERIFY(db); 1807fa9e4066Sahrens mutex_exit(&db->db_mtx); 1808fa9e4066Sahrens 1809fa9e4066Sahrens /* NOTE: we can't rele the parent until after we drop the db_mtx */ 1810c543ec06Sahrens if (parent) 1811ea8dc4b6Seschrock dbuf_rele(parent, NULL); 1812fa9e4066Sahrens 1813fa9e4066Sahrens ASSERT3P(db->db_dnode, ==, dn); 1814fa9e4066Sahrens ASSERT3U(db->db_blkid, ==, blkid); 1815fa9e4066Sahrens ASSERT3U(db->db_level, ==, level); 1816fa9e4066Sahrens *dbp = db; 1817fa9e4066Sahrens 1818fa9e4066Sahrens return (0); 1819fa9e4066Sahrens } 1820fa9e4066Sahrens 1821fa9e4066Sahrens dmu_buf_impl_t * 1822ea8dc4b6Seschrock dbuf_hold(dnode_t *dn, uint64_t blkid, void *tag) 1823fa9e4066Sahrens { 1824fa9e4066Sahrens dmu_buf_impl_t *db; 1825ea8dc4b6Seschrock int err = dbuf_hold_impl(dn, 0, blkid, FALSE, tag, &db); 1826ea8dc4b6Seschrock return (err ? NULL : db); 1827fa9e4066Sahrens } 1828fa9e4066Sahrens 1829fa9e4066Sahrens dmu_buf_impl_t * 1830fa9e4066Sahrens dbuf_hold_level(dnode_t *dn, int level, uint64_t blkid, void *tag) 1831fa9e4066Sahrens { 1832fa9e4066Sahrens dmu_buf_impl_t *db; 1833ea8dc4b6Seschrock int err = dbuf_hold_impl(dn, level, blkid, FALSE, tag, &db); 1834ea8dc4b6Seschrock return (err ? NULL : db); 1835fa9e4066Sahrens } 1836fa9e4066Sahrens 18371934e92fSmaybee void 1838ea8dc4b6Seschrock dbuf_create_bonus(dnode_t *dn) 1839fa9e4066Sahrens { 1840ea8dc4b6Seschrock ASSERT(RW_WRITE_HELD(&dn->dn_struct_rwlock)); 1841ea8dc4b6Seschrock 1842ea8dc4b6Seschrock ASSERT(dn->dn_bonus == NULL); 1843*0a586ceaSMark Shellenbaum dn->dn_bonus = dbuf_create(dn, 0, DMU_BONUS_BLKID, dn->dn_dbuf, NULL); 1844*0a586ceaSMark Shellenbaum } 1845*0a586ceaSMark Shellenbaum 1846*0a586ceaSMark Shellenbaum int 1847*0a586ceaSMark Shellenbaum dbuf_spill_set_blksz(dmu_buf_t *db_fake, uint64_t blksz, dmu_tx_t *tx) 1848*0a586ceaSMark Shellenbaum { 1849*0a586ceaSMark Shellenbaum dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 1850*0a586ceaSMark Shellenbaum if (db->db_blkid != DMU_SPILL_BLKID) 1851*0a586ceaSMark Shellenbaum return (ENOTSUP); 1852*0a586ceaSMark Shellenbaum if (blksz == 0) 1853*0a586ceaSMark Shellenbaum blksz = SPA_MINBLOCKSIZE; 1854*0a586ceaSMark Shellenbaum if (blksz > SPA_MAXBLOCKSIZE) 1855*0a586ceaSMark Shellenbaum blksz = SPA_MAXBLOCKSIZE; 1856*0a586ceaSMark Shellenbaum else 1857*0a586ceaSMark Shellenbaum blksz = P2ROUNDUP(blksz, SPA_MINBLOCKSIZE); 1858*0a586ceaSMark Shellenbaum 1859*0a586ceaSMark Shellenbaum rw_enter(&db->db_dnode->dn_struct_rwlock, RW_WRITER); 1860*0a586ceaSMark Shellenbaum dbuf_new_size(db, blksz, tx); 1861*0a586ceaSMark Shellenbaum rw_exit(&db->db_dnode->dn_struct_rwlock); 1862*0a586ceaSMark Shellenbaum 1863*0a586ceaSMark Shellenbaum return (0); 1864*0a586ceaSMark Shellenbaum } 1865*0a586ceaSMark Shellenbaum 1866*0a586ceaSMark Shellenbaum void 1867*0a586ceaSMark Shellenbaum dbuf_rm_spill(dnode_t *dn, dmu_tx_t *tx) 1868*0a586ceaSMark Shellenbaum { 1869*0a586ceaSMark Shellenbaum dbuf_free_range(dn, DMU_SPILL_BLKID, DMU_SPILL_BLKID, tx); 1870*0a586ceaSMark Shellenbaum dnode_rm_spill(dn, 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) 1884b24ab676SJeff Bonwick { 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) 1895fa9e4066Sahrens { 1896fa9e4066Sahrens int64_t holds; 1897fa9e4066Sahrens 1898b24ab676SJeff Bonwick ASSERT(MUTEX_HELD(&db->db_mtx)); 18999c9dc39aSek DBUF_VERIFY(db); 1900fa9e4066Sahrens 1901fa9e4066Sahrens holds = refcount_remove(&db->db_holds, tag); 1902ea8dc4b6Seschrock ASSERT(holds >= 0); 1903ea8dc4b6Seschrock 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 1911ea8dc4b6Seschrock if (holds == db->db_dirtycnt && 1912c717a561Smaybee db->db_level == 0 && db->db_immediate_evict) 1913ea8dc4b6Seschrock dbuf_evict_user(db); 1914fa9e4066Sahrens 1915fa9e4066Sahrens if (holds == 0) { 1916*0a586ceaSMark 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); 19276b4acc8bSahrens } 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); 19373baa08fcSek if (!DBUF_IS_CACHEABLE(db)) 19383baa08fcSek dbuf_clear(db); 19393baa08fcSek else 19403baa08fcSek mutex_exit(&db->db_mtx); 1941ea8dc4b6Seschrock } 1942fa9e4066Sahrens } else { 1943fa9e4066Sahrens 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 2029*0a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) { 2030*0a586ceaSMark Shellenbaum db->db_blkptr = &dn->dn_phys->dn_spill; 2031*0a586ceaSMark Shellenbaum BP_ZERO(db->db_blkptr); 2032*0a586ceaSMark Shellenbaum return; 2033*0a586ceaSMark 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 } 21329c9dc39aSek DBUF_VERIFY(db); 2133fa9e4066Sahrens 2134*0a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) { 2135*0a586ceaSMark Shellenbaum mutex_enter(&dn->dn_mtx); 2136*0a586ceaSMark Shellenbaum dn->dn_phys->dn_flags |= DNODE_FLAG_SPILL_BLKPTR; 2137*0a586ceaSMark Shellenbaum mutex_exit(&dn->dn_mtx); 2138*0a586ceaSMark Shellenbaum } 2139*0a586ceaSMark 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 */ 2146*0a586ceaSMark 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 2171f82bfe17Sgw /* 2172f82bfe17Sgw * This function may have dropped the db_mtx lock allowing a dmu_sync 2173f82bfe17Sgw * operation to sneak in. As a result, we need to ensure that we 2174f82bfe17Sgw * don't check the dr_override_state until we have returned from 2175f82bfe17Sgw * dbuf_check_blkptr. 2176f82bfe17Sgw */ 2177f82bfe17Sgw dbuf_check_blkptr(dn, db); 2178f82bfe17Sgw 2179c717a561Smaybee /* 2180c717a561Smaybee * If this buffer is in the middle of an immdiate write, 2181c717a561Smaybee * wait for the synchronous IO to complete. 2182c717a561Smaybee */ 2183c717a561Smaybee while (dr->dt.dl.dr_override_state == DR_IN_DMU_SYNC) { 2184c717a561Smaybee ASSERT(dn->dn_object != DMU_META_DNODE_OBJECT); 2185c717a561Smaybee cv_wait(&db->db_changed, &db->db_mtx); 2186c717a561Smaybee ASSERT(dr->dt.dl.dr_override_state != DR_NOT_OVERRIDDEN); 2187c717a561Smaybee } 2188c5c6ffa0Smaybee 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) { 2194ab69d62fSMatthew Ahrens /* 2195ab69d62fSMatthew Ahrens * If this buffer is currently "in use" (i.e., there 2196ab69d62fSMatthew Ahrens * are active holds and db_data still references it), 2197ab69d62fSMatthew Ahrens * then make a copy before we start the write so that 2198ab69d62fSMatthew Ahrens * any modifications from the open txg will not leak 2199ab69d62fSMatthew Ahrens * into this write. 2200ab69d62fSMatthew Ahrens * 2201ab69d62fSMatthew Ahrens * NOTE: this copy does not need to be made for 2202ab69d62fSMatthew Ahrens * objects only modified in the syncing context (e.g. 2203ab69d62fSMatthew Ahrens * DNONE_DNODE blocks). 2204ab69d62fSMatthew Ahrens */ 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); 2208ab69d62fSMatthew Ahrens bcopy(db->db.db_data, (*datap)->b_data, blksz); 220982c9918fSTim Haley } 2210c717a561Smaybee db->db_data_pending = dr; 2211fa9e4066Sahrens 2212c717a561Smaybee mutex_exit(&db->db_mtx); 2213fa9e4066Sahrens 2214088f3894Sahrens dbuf_write(dr, *datap, tx); 2215fa9e4066Sahrens 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); 2221c717a561Smaybee } 222223b11526Smaybee 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; 224023b11526Smaybee } 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); 224623b11526Smaybee } 2247c717a561Smaybee } 224823b11526Smaybee 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 } 2272c5c6ffa0Smaybee 2273*0a586ceaSMark Shellenbaum ASSERT((db->db_blkid != DMU_SPILL_BLKID && 2274*0a586ceaSMark Shellenbaum BP_GET_TYPE(bp) == dn->dn_type) || 2275*0a586ceaSMark Shellenbaum (db->db_blkid == DMU_SPILL_BLKID && 2276*0a586ceaSMark Shellenbaum BP_GET_TYPE(bp) == dn->dn_bonustype)); 2277e14bb325SJeff Bonwick ASSERT(BP_GET_LEVEL(bp) == db->db_level); 2278e14bb325SJeff Bonwick 2279c717a561Smaybee mutex_enter(&db->db_mtx); 2280fa9e4066Sahrens 2281*0a586ceaSMark Shellenbaum #ifdef ZFS_DEBUG 2282*0a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) { 2283*0a586ceaSMark Shellenbaum dnode_t *dn = db->db_dnode; 2284*0a586ceaSMark Shellenbaum ASSERT(dn->dn_phys->dn_flags & DNODE_FLAG_SPILL_BLKPTR); 2285*0a586ceaSMark Shellenbaum ASSERT(!(BP_IS_HOLE(db->db_blkptr)) && 2286*0a586ceaSMark Shellenbaum db->db_blkptr == &dn->dn_phys->dn_spill); 2287*0a586ceaSMark Shellenbaum } 2288*0a586ceaSMark Shellenbaum #endif 2289*0a586ceaSMark Shellenbaum 2290fa9e4066Sahrens if (db->db_level == 0) { 2291fa9e4066Sahrens mutex_enter(&dn->dn_mtx); 2292*0a586ceaSMark Shellenbaum if (db->db_blkid > dn->dn_phys->dn_maxblkid && 2293*0a586ceaSMark 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 { 2305c717a561Smaybee 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; 2318c717a561Smaybee 2319c717a561Smaybee mutex_exit(&db->db_mtx); 2320c717a561Smaybee } 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 2360*0a586ceaSMark Shellenbaum #ifdef ZFS_DEBUG 2361*0a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) { 2362*0a586ceaSMark Shellenbaum dnode_t *dn = db->db_dnode; 2363*0a586ceaSMark Shellenbaum ASSERT(dn->dn_phys->dn_flags & DNODE_FLAG_SPILL_BLKPTR); 2364*0a586ceaSMark Shellenbaum ASSERT(!(BP_IS_HOLE(db->db_blkptr)) && 2365*0a586ceaSMark Shellenbaum db->db_blkptr == &dn->dn_phys->dn_spill); 2366*0a586ceaSMark Shellenbaum } 2367*0a586ceaSMark Shellenbaum #endif 2368*0a586ceaSMark Shellenbaum 2369c717a561Smaybee if (db->db_level == 0) { 2370*0a586ceaSMark 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) { 237382c9918fSTim Haley 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)) 237782c9918fSTim Haley 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 } 2391c25056deSgw mutex_destroy(&dr->dt.di.dr_mtx); 2392c25056deSgw list_destroy(&dr->dt.di.dr_children); 2393c717a561Smaybee } 2394c717a561Smaybee kmem_free(dr, sizeof (dbuf_dirty_record_t)); 2395fa9e4066Sahrens 2396fa9e4066Sahrens cv_broadcast(&db->db_changed); 2397fa9e4066Sahrens ASSERT(db->db_dirtycnt > 0); 2398fa9e4066Sahrens 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 } 2437fa9e4066Sahrens mutex_exit(&db->db_mtx); 2438fa9e4066Sahrens 2439b24ab676SJeff Bonwick dbuf_write_done(zio, NULL, db); 2440b24ab676SJeff Bonwick } 2441b24ab676SJeff Bonwick 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; 2453*0a586ceaSMark 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 { 2477*0a586ceaSMark Shellenbaum ASSERT((db->db_level == dn->dn_phys->dn_nlevels-1 && 2478*0a586ceaSMark Shellenbaum db->db_blkid != DMU_SPILL_BLKID) || 2479*0a586ceaSMark Shellenbaum (db->db_blkid == DMU_SPILL_BLKID && db->db_level == 0)); 2480*0a586ceaSMark Shellenbaum if (db->db_blkid != DMU_SPILL_BLKID) 2481*0a586ceaSMark Shellenbaum ASSERT3P(db->db_blkptr, ==, 2482*0a586ceaSMark Shellenbaum &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); 2489fa9e4066Sahrens 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 2494*0a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) 2495*0a586ceaSMark Shellenbaum wp_flag = WP_SPILL; 2496*0a586ceaSMark Shellenbaum wp_flag |= (db->db_state == DB_NOFILL) ? WP_NOFILL : 0; 2497*0a586ceaSMark Shellenbaum 2498*0a586ceaSMark 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