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 /* 2234f18512Seschrock * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 23fa9e4066Sahrens * Use is subject to license terms. 24fa9e4066Sahrens */ 25fa9e4066Sahrens 26fa9e4066Sahrens #pragma ident "%Z%%M% %I% %E% SMI" 27fa9e4066Sahrens 28fa9e4066Sahrens #include <sys/zfs_context.h> 29fa9e4066Sahrens #include <sys/dmu.h> 30fa9e4066Sahrens #include <sys/dmu_impl.h> 31fa9e4066Sahrens #include <sys/dbuf.h> 32fa9e4066Sahrens #include <sys/dmu_objset.h> 33fa9e4066Sahrens #include <sys/dsl_dataset.h> 34fa9e4066Sahrens #include <sys/dsl_dir.h> 35fa9e4066Sahrens #include <sys/dmu_tx.h> 36fa9e4066Sahrens #include <sys/spa.h> 37fa9e4066Sahrens #include <sys/zio.h> 38fa9e4066Sahrens #include <sys/dmu_zfetch.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); 42fa9e4066Sahrens static arc_done_func_t dbuf_write_done; 43fa9e4066Sahrens 44fa9e4066Sahrens /* 45fa9e4066Sahrens * Global data structures and functions for the dbuf cache. 46fa9e4066Sahrens */ 47fa9e4066Sahrens taskq_t *dbuf_tq; 48fa9e4066Sahrens static kmem_cache_t *dbuf_cache; 49fa9e4066Sahrens 50fa9e4066Sahrens /* ARGSUSED */ 51fa9e4066Sahrens static int 52fa9e4066Sahrens dbuf_cons(void *vdb, void *unused, int kmflag) 53fa9e4066Sahrens { 54fa9e4066Sahrens dmu_buf_impl_t *db = vdb; 55fa9e4066Sahrens bzero(db, sizeof (dmu_buf_impl_t)); 56fa9e4066Sahrens 57fa9e4066Sahrens mutex_init(&db->db_mtx, NULL, MUTEX_DEFAULT, NULL); 58fa9e4066Sahrens cv_init(&db->db_changed, NULL, CV_DEFAULT, NULL); 59fa9e4066Sahrens refcount_create(&db->db_holds); 60fa9e4066Sahrens return (0); 61fa9e4066Sahrens } 62fa9e4066Sahrens 63fa9e4066Sahrens /* ARGSUSED */ 64fa9e4066Sahrens static void 65fa9e4066Sahrens dbuf_dest(void *vdb, void *unused) 66fa9e4066Sahrens { 67fa9e4066Sahrens dmu_buf_impl_t *db = vdb; 68fa9e4066Sahrens mutex_destroy(&db->db_mtx); 69fa9e4066Sahrens cv_destroy(&db->db_changed); 70fa9e4066Sahrens refcount_destroy(&db->db_holds); 71fa9e4066Sahrens } 72fa9e4066Sahrens 73fa9e4066Sahrens /* 74fa9e4066Sahrens * dbuf hash table routines 75fa9e4066Sahrens */ 76fa9e4066Sahrens static dbuf_hash_table_t dbuf_hash_table; 77fa9e4066Sahrens 78fa9e4066Sahrens static uint64_t dbuf_hash_count; 79fa9e4066Sahrens 80fa9e4066Sahrens static uint64_t 81fa9e4066Sahrens dbuf_hash(void *os, uint64_t obj, uint8_t lvl, uint64_t blkid) 82fa9e4066Sahrens { 83fa9e4066Sahrens uintptr_t osv = (uintptr_t)os; 84fa9e4066Sahrens uint64_t crc = -1ULL; 85fa9e4066Sahrens 86fa9e4066Sahrens ASSERT(zfs_crc64_table[128] == ZFS_CRC64_POLY); 87fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (lvl)) & 0xFF]; 88fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (osv >> 6)) & 0xFF]; 89fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (obj >> 0)) & 0xFF]; 90fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (obj >> 8)) & 0xFF]; 91fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (blkid >> 0)) & 0xFF]; 92fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (blkid >> 8)) & 0xFF]; 93fa9e4066Sahrens 94fa9e4066Sahrens crc ^= (osv>>14) ^ (obj>>16) ^ (blkid>>16); 95fa9e4066Sahrens 96fa9e4066Sahrens return (crc); 97fa9e4066Sahrens } 98fa9e4066Sahrens 99fa9e4066Sahrens #define DBUF_HASH(os, obj, level, blkid) dbuf_hash(os, obj, level, blkid); 100fa9e4066Sahrens 101fa9e4066Sahrens #define DBUF_EQUAL(dbuf, os, obj, level, blkid) \ 102fa9e4066Sahrens ((dbuf)->db.db_object == (obj) && \ 103fa9e4066Sahrens (dbuf)->db_objset == (os) && \ 104fa9e4066Sahrens (dbuf)->db_level == (level) && \ 105fa9e4066Sahrens (dbuf)->db_blkid == (blkid)) 106fa9e4066Sahrens 107fa9e4066Sahrens dmu_buf_impl_t * 108fa9e4066Sahrens dbuf_find(dnode_t *dn, uint8_t level, uint64_t blkid) 109fa9e4066Sahrens { 110fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 111fa9e4066Sahrens objset_impl_t *os = dn->dn_objset; 112fa9e4066Sahrens uint64_t obj = dn->dn_object; 113fa9e4066Sahrens uint64_t hv = DBUF_HASH(os, obj, level, blkid); 114fa9e4066Sahrens uint64_t idx = hv & h->hash_table_mask; 115fa9e4066Sahrens dmu_buf_impl_t *db; 116fa9e4066Sahrens 117fa9e4066Sahrens mutex_enter(DBUF_HASH_MUTEX(h, idx)); 118fa9e4066Sahrens for (db = h->hash_table[idx]; db != NULL; db = db->db_hash_next) { 119fa9e4066Sahrens if (DBUF_EQUAL(db, os, obj, level, blkid)) { 120fa9e4066Sahrens mutex_enter(&db->db_mtx); 121*ea8dc4b6Seschrock if (db->db_state != DB_EVICTING) { 122fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 123fa9e4066Sahrens return (db); 124fa9e4066Sahrens } 125fa9e4066Sahrens mutex_exit(&db->db_mtx); 126fa9e4066Sahrens } 127fa9e4066Sahrens } 128fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 129fa9e4066Sahrens return (NULL); 130fa9e4066Sahrens } 131fa9e4066Sahrens 132fa9e4066Sahrens /* 133fa9e4066Sahrens * Insert an entry into the hash table. If there is already an element 134fa9e4066Sahrens * equal to elem in the hash table, then the already existing element 135fa9e4066Sahrens * will be returned and the new element will not be inserted. 136fa9e4066Sahrens * Otherwise returns NULL. 137fa9e4066Sahrens */ 138fa9e4066Sahrens static dmu_buf_impl_t * 139fa9e4066Sahrens dbuf_hash_insert(dmu_buf_impl_t *db) 140fa9e4066Sahrens { 141fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 142fa9e4066Sahrens objset_impl_t *os = db->db_objset; 143fa9e4066Sahrens uint64_t obj = db->db.db_object; 144fa9e4066Sahrens int level = db->db_level; 145fa9e4066Sahrens uint64_t blkid = db->db_blkid; 146fa9e4066Sahrens uint64_t hv = DBUF_HASH(os, obj, level, blkid); 147fa9e4066Sahrens uint64_t idx = hv & h->hash_table_mask; 148fa9e4066Sahrens dmu_buf_impl_t *dbf; 149fa9e4066Sahrens 150fa9e4066Sahrens mutex_enter(DBUF_HASH_MUTEX(h, idx)); 151fa9e4066Sahrens for (dbf = h->hash_table[idx]; dbf != NULL; dbf = dbf->db_hash_next) { 152fa9e4066Sahrens if (DBUF_EQUAL(dbf, os, obj, level, blkid)) { 153fa9e4066Sahrens mutex_enter(&dbf->db_mtx); 154*ea8dc4b6Seschrock if (dbf->db_state != DB_EVICTING) { 155fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 156fa9e4066Sahrens return (dbf); 157fa9e4066Sahrens } 158fa9e4066Sahrens mutex_exit(&dbf->db_mtx); 159fa9e4066Sahrens } 160fa9e4066Sahrens } 161fa9e4066Sahrens 162fa9e4066Sahrens mutex_enter(&db->db_mtx); 163fa9e4066Sahrens db->db_hash_next = h->hash_table[idx]; 164fa9e4066Sahrens h->hash_table[idx] = db; 165fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 166fa9e4066Sahrens atomic_add_64(&dbuf_hash_count, 1); 167fa9e4066Sahrens 168fa9e4066Sahrens return (NULL); 169fa9e4066Sahrens } 170fa9e4066Sahrens 171fa9e4066Sahrens /* 172fa9e4066Sahrens * Remove an entry from the hash table. This operation will 173fa9e4066Sahrens * fail if there are any existing holds on the db. 174fa9e4066Sahrens */ 175fa9e4066Sahrens static void 176fa9e4066Sahrens dbuf_hash_remove(dmu_buf_impl_t *db) 177fa9e4066Sahrens { 178fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 179fa9e4066Sahrens uint64_t hv = DBUF_HASH(db->db_objset, db->db.db_object, 180fa9e4066Sahrens db->db_level, db->db_blkid); 181fa9e4066Sahrens uint64_t idx = hv & h->hash_table_mask; 182fa9e4066Sahrens dmu_buf_impl_t *dbf, **dbp; 183fa9e4066Sahrens 184fa9e4066Sahrens /* 185fa9e4066Sahrens * We musn't hold db_mtx to maintin lock ordering: 186fa9e4066Sahrens * DBUF_HASH_MUTEX > db_mtx. 187fa9e4066Sahrens */ 188fa9e4066Sahrens ASSERT(refcount_is_zero(&db->db_holds)); 189*ea8dc4b6Seschrock ASSERT(db->db_state == DB_EVICTING); 190fa9e4066Sahrens ASSERT(!MUTEX_HELD(&db->db_mtx)); 191fa9e4066Sahrens 192fa9e4066Sahrens mutex_enter(DBUF_HASH_MUTEX(h, idx)); 193fa9e4066Sahrens dbp = &h->hash_table[idx]; 194fa9e4066Sahrens while ((dbf = *dbp) != db) { 195fa9e4066Sahrens dbp = &dbf->db_hash_next; 196fa9e4066Sahrens ASSERT(dbf != NULL); 197fa9e4066Sahrens } 198fa9e4066Sahrens *dbp = db->db_hash_next; 199fa9e4066Sahrens db->db_hash_next = NULL; 200fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 201fa9e4066Sahrens atomic_add_64(&dbuf_hash_count, -1); 202fa9e4066Sahrens } 203fa9e4066Sahrens 204*ea8dc4b6Seschrock static arc_evict_func_t dbuf_do_evict; 205fa9e4066Sahrens 206fa9e4066Sahrens static void 207fa9e4066Sahrens dbuf_evict_user(dmu_buf_impl_t *db) 208fa9e4066Sahrens { 209fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 210fa9e4066Sahrens 211fa9e4066Sahrens if (db->db_level != 0 || db->db_d.db_evict_func == NULL) 212fa9e4066Sahrens return; 213fa9e4066Sahrens 214fa9e4066Sahrens if (db->db_d.db_user_data_ptr_ptr) 215fa9e4066Sahrens *db->db_d.db_user_data_ptr_ptr = db->db.db_data; 216fa9e4066Sahrens db->db_d.db_evict_func(&db->db, db->db_d.db_user_ptr); 217fa9e4066Sahrens db->db_d.db_user_ptr = NULL; 218fa9e4066Sahrens db->db_d.db_user_data_ptr_ptr = NULL; 219fa9e4066Sahrens db->db_d.db_evict_func = NULL; 220fa9e4066Sahrens } 221fa9e4066Sahrens 222fa9e4066Sahrens void 223*ea8dc4b6Seschrock dbuf_evict(dmu_buf_impl_t *db) 224*ea8dc4b6Seschrock { 225*ea8dc4b6Seschrock int i; 226*ea8dc4b6Seschrock 227*ea8dc4b6Seschrock ASSERT(MUTEX_HELD(&db->db_mtx)); 228*ea8dc4b6Seschrock ASSERT(db->db_buf == NULL); 229*ea8dc4b6Seschrock 230*ea8dc4b6Seschrock #ifdef ZFS_DEBUG 231*ea8dc4b6Seschrock for (i = 0; i < TXG_SIZE; i++) { 232*ea8dc4b6Seschrock ASSERT(!list_link_active(&db->db_dirty_node[i])); 233*ea8dc4b6Seschrock ASSERT(db->db_level != 0 || db->db_d.db_data_old[i] == NULL); 234*ea8dc4b6Seschrock } 235*ea8dc4b6Seschrock #endif 236*ea8dc4b6Seschrock dbuf_clear(db); 237*ea8dc4b6Seschrock dbuf_destroy(db); 238*ea8dc4b6Seschrock } 239*ea8dc4b6Seschrock 240*ea8dc4b6Seschrock void 241fa9e4066Sahrens dbuf_init(void) 242fa9e4066Sahrens { 243*ea8dc4b6Seschrock uint64_t hsize = 1ULL << 16; 244fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 245fa9e4066Sahrens int i; 246fa9e4066Sahrens 247fa9e4066Sahrens /* 248fa9e4066Sahrens * The hash table is big enough to fill all of physical memory 249*ea8dc4b6Seschrock * with an average 4K block size. The table will take up 250*ea8dc4b6Seschrock * totalmem*sizeof(void*)/4K (i.e. 2MB/GB with 8-byte pointers). 251fa9e4066Sahrens */ 252*ea8dc4b6Seschrock while (hsize * 4096 < physmem * PAGESIZE) 253fa9e4066Sahrens hsize <<= 1; 254fa9e4066Sahrens 255*ea8dc4b6Seschrock retry: 256fa9e4066Sahrens h->hash_table_mask = hsize - 1; 257*ea8dc4b6Seschrock h->hash_table = kmem_zalloc(hsize * sizeof (void *), KM_NOSLEEP); 258*ea8dc4b6Seschrock if (h->hash_table == NULL) { 259*ea8dc4b6Seschrock /* XXX - we should really return an error instead of assert */ 260*ea8dc4b6Seschrock ASSERT(hsize > (1ULL << 10)); 261*ea8dc4b6Seschrock hsize >>= 1; 262*ea8dc4b6Seschrock goto retry; 263*ea8dc4b6Seschrock } 264fa9e4066Sahrens 265fa9e4066Sahrens dbuf_cache = kmem_cache_create("dmu_buf_impl_t", 266fa9e4066Sahrens sizeof (dmu_buf_impl_t), 267fa9e4066Sahrens 0, dbuf_cons, dbuf_dest, NULL, NULL, NULL, 0); 268fa9e4066Sahrens dbuf_tq = taskq_create("dbuf_tq", 8, maxclsyspri, 50, INT_MAX, 269fa9e4066Sahrens TASKQ_PREPOPULATE); 270fa9e4066Sahrens 271fa9e4066Sahrens for (i = 0; i < DBUF_MUTEXES; i++) 272fa9e4066Sahrens mutex_init(&h->hash_mutexes[i], NULL, MUTEX_DEFAULT, NULL); 273fa9e4066Sahrens } 274fa9e4066Sahrens 275fa9e4066Sahrens void 276fa9e4066Sahrens dbuf_fini(void) 277fa9e4066Sahrens { 278fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 279fa9e4066Sahrens int i; 280fa9e4066Sahrens 281fa9e4066Sahrens taskq_destroy(dbuf_tq); 282fa9e4066Sahrens dbuf_tq = NULL; 283fa9e4066Sahrens 284fa9e4066Sahrens for (i = 0; i < DBUF_MUTEXES; i++) 285fa9e4066Sahrens mutex_destroy(&h->hash_mutexes[i]); 286fa9e4066Sahrens kmem_free(h->hash_table, (h->hash_table_mask + 1) * sizeof (void *)); 287fa9e4066Sahrens kmem_cache_destroy(dbuf_cache); 288fa9e4066Sahrens } 289fa9e4066Sahrens 290fa9e4066Sahrens /* 291fa9e4066Sahrens * Other stuff. 292fa9e4066Sahrens */ 293fa9e4066Sahrens 2949c9dc39aSek110237 #ifdef ZFS_DEBUG 295fa9e4066Sahrens static void 296fa9e4066Sahrens dbuf_verify(dmu_buf_impl_t *db) 297fa9e4066Sahrens { 298fa9e4066Sahrens int i; 299fa9e4066Sahrens dnode_t *dn = db->db_dnode; 300fa9e4066Sahrens 301fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 302fa9e4066Sahrens 303fa9e4066Sahrens if (!(zfs_flags & ZFS_DEBUG_DBUF_VERIFY)) 304fa9e4066Sahrens return; 305fa9e4066Sahrens 306fa9e4066Sahrens ASSERT(db->db_objset != NULL); 307fa9e4066Sahrens if (dn == NULL) { 308fa9e4066Sahrens ASSERT(db->db_parent == NULL); 309fa9e4066Sahrens ASSERT(db->db_blkptr == NULL); 310fa9e4066Sahrens } else { 311fa9e4066Sahrens ASSERT3U(db->db.db_object, ==, dn->dn_object); 312fa9e4066Sahrens ASSERT3P(db->db_objset, ==, dn->dn_objset); 313fa9e4066Sahrens ASSERT3U(db->db_level, <, dn->dn_nlevels); 314*ea8dc4b6Seschrock ASSERT(db->db_blkid == DB_BONUS_BLKID || 315*ea8dc4b6Seschrock list_head(&dn->dn_dbufs)); 316fa9e4066Sahrens } 317fa9e4066Sahrens if (db->db_blkid == DB_BONUS_BLKID) { 318fa9e4066Sahrens ASSERT(dn != NULL); 319fa9e4066Sahrens ASSERT3U(db->db.db_size, ==, dn->dn_bonuslen); 320fa9e4066Sahrens ASSERT3U(db->db.db_offset, ==, DB_BONUS_BLKID); 321fa9e4066Sahrens } else { 322fa9e4066Sahrens ASSERT3U(db->db.db_offset, ==, db->db_blkid * db->db.db_size); 323fa9e4066Sahrens } 324fa9e4066Sahrens 325fa9e4066Sahrens if (db->db_level == 0) { 326fa9e4066Sahrens /* we can be momentarily larger in dnode_set_blksz() */ 327fa9e4066Sahrens if (db->db_blkid != DB_BONUS_BLKID && dn) { 328fa9e4066Sahrens ASSERT3U(db->db.db_size, >=, dn->dn_datablksz); 329fa9e4066Sahrens } 330*ea8dc4b6Seschrock if (db->db.db_object == DMU_META_DNODE_OBJECT) { 331fa9e4066Sahrens for (i = 0; i < TXG_SIZE; i++) { 332fa9e4066Sahrens /* 333fa9e4066Sahrens * it should only be modified in syncing 334fa9e4066Sahrens * context, so make sure we only have 335fa9e4066Sahrens * one copy of the data. 336fa9e4066Sahrens */ 337fa9e4066Sahrens ASSERT(db->db_d.db_data_old[i] == NULL || 338fa9e4066Sahrens db->db_d.db_data_old[i] == db->db_buf); 339fa9e4066Sahrens } 340fa9e4066Sahrens } 341fa9e4066Sahrens } 342fa9e4066Sahrens 343fa9e4066Sahrens /* verify db->db_blkptr */ 344fa9e4066Sahrens if (db->db_blkptr) { 345fa9e4066Sahrens if (db->db_parent == dn->dn_dbuf) { 346fa9e4066Sahrens /* db is pointed to by the dnode */ 347fa9e4066Sahrens /* ASSERT3U(db->db_blkid, <, dn->dn_nblkptr); */ 348*ea8dc4b6Seschrock if (db->db.db_object == DMU_META_DNODE_OBJECT) 349fa9e4066Sahrens ASSERT(db->db_parent == NULL); 350fa9e4066Sahrens else 351fa9e4066Sahrens ASSERT(db->db_parent != NULL); 352fa9e4066Sahrens ASSERT3P(db->db_blkptr, ==, 353fa9e4066Sahrens &dn->dn_phys->dn_blkptr[db->db_blkid]); 354fa9e4066Sahrens } else { 355fa9e4066Sahrens /* db is pointed to by an indirect block */ 356fa9e4066Sahrens int epb = db->db_parent->db.db_size >> SPA_BLKPTRSHIFT; 357fa9e4066Sahrens ASSERT3U(db->db_parent->db_level, ==, db->db_level+1); 358fa9e4066Sahrens ASSERT3U(db->db_parent->db.db_object, ==, 359fa9e4066Sahrens db->db.db_object); 360fa9e4066Sahrens /* 361fa9e4066Sahrens * dnode_grow_indblksz() can make this fail if we don't 362fa9e4066Sahrens * have the struct_rwlock. XXX indblksz no longer 363fa9e4066Sahrens * grows. safe to do this now? 364fa9e4066Sahrens */ 365fa9e4066Sahrens if (RW_WRITE_HELD(&db->db_dnode->dn_struct_rwlock)) { 366fa9e4066Sahrens ASSERT3P(db->db_blkptr, ==, 367fa9e4066Sahrens ((blkptr_t *)db->db_parent->db.db_data + 368fa9e4066Sahrens db->db_blkid % epb)); 369fa9e4066Sahrens } 370fa9e4066Sahrens } 371fa9e4066Sahrens } 372fa9e4066Sahrens if ((db->db_blkptr == NULL || BP_IS_HOLE(db->db_blkptr)) && 373fa9e4066Sahrens db->db.db_data && db->db_blkid != DB_BONUS_BLKID && 374fa9e4066Sahrens db->db_state != DB_FILL && !dn->dn_free_txg) { 375fa9e4066Sahrens /* 376fa9e4066Sahrens * If the blkptr isn't set but they have nonzero data, 377fa9e4066Sahrens * it had better be dirty, otherwise we'll lose that 378fa9e4066Sahrens * data when we evict this buffer. 379fa9e4066Sahrens */ 380fa9e4066Sahrens if (db->db_dirtycnt == 0) { 381fa9e4066Sahrens uint64_t *buf = db->db.db_data; 382fa9e4066Sahrens int i; 383fa9e4066Sahrens 384fa9e4066Sahrens for (i = 0; i < db->db.db_size >> 3; i++) { 385fa9e4066Sahrens ASSERT(buf[i] == 0); 386fa9e4066Sahrens } 387fa9e4066Sahrens } 388fa9e4066Sahrens } 389fa9e4066Sahrens } 3909c9dc39aSek110237 #endif 391fa9e4066Sahrens 392fa9e4066Sahrens static void 393fa9e4066Sahrens dbuf_update_data(dmu_buf_impl_t *db) 394fa9e4066Sahrens { 395fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 396fa9e4066Sahrens if (db->db_level == 0 && db->db_d.db_user_data_ptr_ptr) { 397fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 398fa9e4066Sahrens *db->db_d.db_user_data_ptr_ptr = db->db.db_data; 399fa9e4066Sahrens } 400fa9e4066Sahrens } 401fa9e4066Sahrens 402fa9e4066Sahrens static void 403fa9e4066Sahrens dbuf_set_data(dmu_buf_impl_t *db, arc_buf_t *buf) 404fa9e4066Sahrens { 405fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 406*ea8dc4b6Seschrock ASSERT(db->db_buf == NULL || !arc_has_callback(db->db_buf)); 407fa9e4066Sahrens db->db_buf = buf; 408*ea8dc4b6Seschrock if (buf != NULL) { 409*ea8dc4b6Seschrock ASSERT(buf->b_data != NULL); 410fa9e4066Sahrens db->db.db_data = buf->b_data; 411*ea8dc4b6Seschrock if (!arc_released(buf)) 412*ea8dc4b6Seschrock arc_set_callback(buf, dbuf_do_evict, db); 413fa9e4066Sahrens dbuf_update_data(db); 414*ea8dc4b6Seschrock } else { 415*ea8dc4b6Seschrock dbuf_evict_user(db); 416*ea8dc4b6Seschrock db->db.db_data = NULL; 417*ea8dc4b6Seschrock db->db_state = DB_UNCACHED; 418*ea8dc4b6Seschrock } 419fa9e4066Sahrens } 420fa9e4066Sahrens 421fa9e4066Sahrens uint64_t 422fa9e4066Sahrens dbuf_whichblock(dnode_t *dn, uint64_t offset) 423fa9e4066Sahrens { 424fa9e4066Sahrens if (dn->dn_datablkshift) { 425fa9e4066Sahrens return (offset >> dn->dn_datablkshift); 426fa9e4066Sahrens } else { 427fa9e4066Sahrens ASSERT3U(offset, <, dn->dn_datablksz); 428fa9e4066Sahrens return (0); 429fa9e4066Sahrens } 430fa9e4066Sahrens } 431fa9e4066Sahrens 432fa9e4066Sahrens static void 433fa9e4066Sahrens dbuf_read_done(zio_t *zio, arc_buf_t *buf, void *vdb) 434fa9e4066Sahrens { 435fa9e4066Sahrens dmu_buf_impl_t *db = vdb; 436fa9e4066Sahrens 437fa9e4066Sahrens mutex_enter(&db->db_mtx); 438fa9e4066Sahrens ASSERT3U(db->db_state, ==, DB_READ); 439fa9e4066Sahrens /* 440fa9e4066Sahrens * All reads are synchronous, so we must have a hold on the dbuf 441fa9e4066Sahrens */ 442fa9e4066Sahrens ASSERT(refcount_count(&db->db_holds) > 0); 443*ea8dc4b6Seschrock ASSERT(db->db_buf == NULL); 444fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 445fa9e4066Sahrens if (db->db_level == 0 && db->db_d.db_freed_in_flight) { 446fa9e4066Sahrens /* we were freed in flight; disregard any error */ 447fa9e4066Sahrens arc_release(buf, db); 448fa9e4066Sahrens bzero(buf->b_data, db->db.db_size); 449fa9e4066Sahrens db->db_d.db_freed_in_flight = FALSE; 450fa9e4066Sahrens dbuf_set_data(db, buf); 451fa9e4066Sahrens db->db_state = DB_CACHED; 452fa9e4066Sahrens } else if (zio == NULL || zio->io_error == 0) { 453fa9e4066Sahrens dbuf_set_data(db, buf); 454fa9e4066Sahrens db->db_state = DB_CACHED; 455fa9e4066Sahrens } else { 456fa9e4066Sahrens ASSERT(db->db_blkid != DB_BONUS_BLKID); 457fa9e4066Sahrens ASSERT3P(db->db_buf, ==, NULL); 458*ea8dc4b6Seschrock VERIFY(arc_buf_remove_ref(buf, db) == 1); 459*ea8dc4b6Seschrock db->db_state = DB_UNCACHED; 460fa9e4066Sahrens } 461fa9e4066Sahrens cv_broadcast(&db->db_changed); 462fa9e4066Sahrens mutex_exit(&db->db_mtx); 463*ea8dc4b6Seschrock dbuf_rele(db, NULL); 464fa9e4066Sahrens } 465fa9e4066Sahrens 466*ea8dc4b6Seschrock static void 467fa9e4066Sahrens dbuf_read_impl(dmu_buf_impl_t *db, zio_t *zio, uint32_t flags) 468fa9e4066Sahrens { 469fa9e4066Sahrens blkptr_t *bp; 470*ea8dc4b6Seschrock zbookmark_t zb; 471fa9e4066Sahrens 472fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 473fa9e4066Sahrens /* We need the struct_rwlock to prevent db_blkptr from changing. */ 474fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&db->db_dnode->dn_struct_rwlock)); 475*ea8dc4b6Seschrock ASSERT(MUTEX_HELD(&db->db_mtx)); 476*ea8dc4b6Seschrock ASSERT(db->db_state == DB_UNCACHED); 477*ea8dc4b6Seschrock ASSERT(db->db_buf == NULL); 478fa9e4066Sahrens 479fa9e4066Sahrens if (db->db_blkid == DB_BONUS_BLKID) { 480fa9e4066Sahrens ASSERT3U(db->db_dnode->dn_bonuslen, ==, db->db.db_size); 481*ea8dc4b6Seschrock db->db.db_data = zio_buf_alloc(DN_MAX_BONUSLEN); 482fa9e4066Sahrens if (db->db.db_size < DN_MAX_BONUSLEN) 483*ea8dc4b6Seschrock bzero(db->db.db_data, DN_MAX_BONUSLEN); 484*ea8dc4b6Seschrock bcopy(DN_BONUS(db->db_dnode->dn_phys), db->db.db_data, 485fa9e4066Sahrens db->db.db_size); 486*ea8dc4b6Seschrock dbuf_update_data(db); 487fa9e4066Sahrens db->db_state = DB_CACHED; 488fa9e4066Sahrens mutex_exit(&db->db_mtx); 489fa9e4066Sahrens return; 490fa9e4066Sahrens } 491fa9e4066Sahrens 492fa9e4066Sahrens if (db->db_level == 0 && dnode_block_freed(db->db_dnode, db->db_blkid)) 493fa9e4066Sahrens bp = NULL; 494fa9e4066Sahrens else 495fa9e4066Sahrens bp = db->db_blkptr; 496fa9e4066Sahrens 497fa9e4066Sahrens if (bp == NULL) 498fa9e4066Sahrens dprintf_dbuf(db, "blkptr: %s\n", "NULL"); 499fa9e4066Sahrens else 500fa9e4066Sahrens dprintf_dbuf_bp(db, bp, "%s", "blkptr:"); 501fa9e4066Sahrens 502fa9e4066Sahrens if (bp == NULL || BP_IS_HOLE(bp)) { 503fa9e4066Sahrens ASSERT(bp == NULL || BP_IS_HOLE(bp)); 504fa9e4066Sahrens dbuf_set_data(db, arc_buf_alloc(db->db_dnode->dn_objset->os_spa, 505fa9e4066Sahrens db->db.db_size, db)); 506fa9e4066Sahrens bzero(db->db.db_data, db->db.db_size); 507fa9e4066Sahrens db->db_state = DB_CACHED; 508fa9e4066Sahrens mutex_exit(&db->db_mtx); 509fa9e4066Sahrens return; 510fa9e4066Sahrens } 511fa9e4066Sahrens 512fa9e4066Sahrens db->db_state = DB_READ; 513fa9e4066Sahrens mutex_exit(&db->db_mtx); 514fa9e4066Sahrens 515*ea8dc4b6Seschrock zb.zb_objset = db->db_objset->os_dsl_dataset ? 516*ea8dc4b6Seschrock db->db_objset->os_dsl_dataset->ds_object : 0; 517*ea8dc4b6Seschrock zb.zb_object = db->db.db_object; 518*ea8dc4b6Seschrock zb.zb_level = db->db_level; 519*ea8dc4b6Seschrock zb.zb_blkid = db->db_blkid; 520*ea8dc4b6Seschrock 521*ea8dc4b6Seschrock dbuf_add_ref(db, NULL); 522fa9e4066Sahrens /* ZIO_FLAG_CANFAIL callers have to check the parent zio's error */ 523fa9e4066Sahrens (void) arc_read(zio, db->db_dnode->dn_objset->os_spa, bp, 524fa9e4066Sahrens db->db_level > 0 ? byteswap_uint64_array : 525fa9e4066Sahrens dmu_ot[db->db_dnode->dn_type].ot_byteswap, 526fa9e4066Sahrens dbuf_read_done, db, ZIO_PRIORITY_SYNC_READ, 527fa9e4066Sahrens (flags & DB_RF_CANFAIL) ? ZIO_FLAG_CANFAIL : ZIO_FLAG_MUSTSUCCEED, 528*ea8dc4b6Seschrock ARC_NOWAIT, &zb); 529fa9e4066Sahrens } 530fa9e4066Sahrens 531*ea8dc4b6Seschrock int 532*ea8dc4b6Seschrock dbuf_read(dmu_buf_impl_t *db, zio_t *zio, uint32_t flags) 533fa9e4066Sahrens { 534*ea8dc4b6Seschrock int err = 0; 535*ea8dc4b6Seschrock int havepzio = (zio != NULL); 536fa9e4066Sahrens 537fa9e4066Sahrens /* 538fa9e4066Sahrens * We don't have to hold the mutex to check db_state because it 539fa9e4066Sahrens * can't be freed while we have a hold on the buffer. 540fa9e4066Sahrens */ 541fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 542fa9e4066Sahrens if (db->db_state == DB_CACHED) 543fa9e4066Sahrens return (0); 544fa9e4066Sahrens 545fa9e4066Sahrens if ((flags & DB_RF_HAVESTRUCT) == 0) 546fa9e4066Sahrens rw_enter(&db->db_dnode->dn_struct_rwlock, RW_READER); 547fa9e4066Sahrens 548fa9e4066Sahrens mutex_enter(&db->db_mtx); 549*ea8dc4b6Seschrock if (db->db_state == DB_CACHED) { 550*ea8dc4b6Seschrock mutex_exit(&db->db_mtx); 551*ea8dc4b6Seschrock if ((flags & DB_RF_HAVESTRUCT) == 0) 552*ea8dc4b6Seschrock rw_exit(&db->db_dnode->dn_struct_rwlock); 553*ea8dc4b6Seschrock } else if (db->db_state == DB_UNCACHED) { 554*ea8dc4b6Seschrock if (zio == NULL) { 555*ea8dc4b6Seschrock zio = zio_root(db->db_dnode->dn_objset->os_spa, 556*ea8dc4b6Seschrock NULL, NULL, ZIO_FLAG_CANFAIL); 557*ea8dc4b6Seschrock } 558*ea8dc4b6Seschrock dbuf_read_impl(db, zio, flags); 559*ea8dc4b6Seschrock /* dbuf_read_impl has dropped db_mtx for us */ 560*ea8dc4b6Seschrock 561*ea8dc4b6Seschrock if (db->db_level == 0 && db->db_blkid != DB_BONUS_BLKID && 562*ea8dc4b6Seschrock (flags & DB_RF_NOPREFETCH) == 0 && 563*ea8dc4b6Seschrock db->db_dnode != NULL) { 564*ea8dc4b6Seschrock dmu_zfetch(&db->db_dnode->dn_zfetch, db->db.db_offset, 565*ea8dc4b6Seschrock db->db.db_size); 566*ea8dc4b6Seschrock } 567*ea8dc4b6Seschrock 568*ea8dc4b6Seschrock if ((flags & DB_RF_HAVESTRUCT) == 0) 569*ea8dc4b6Seschrock rw_exit(&db->db_dnode->dn_struct_rwlock); 570*ea8dc4b6Seschrock 571*ea8dc4b6Seschrock if (!havepzio) 572*ea8dc4b6Seschrock err = zio_wait(zio); 573*ea8dc4b6Seschrock } else { 574*ea8dc4b6Seschrock if ((flags & DB_RF_HAVESTRUCT) == 0) 575*ea8dc4b6Seschrock rw_exit(&db->db_dnode->dn_struct_rwlock); 576*ea8dc4b6Seschrock if ((flags & DB_RF_NEVERWAIT) == 0) { 577*ea8dc4b6Seschrock while (db->db_state == DB_READ || 578*ea8dc4b6Seschrock db->db_state == DB_FILL) { 579fa9e4066Sahrens ASSERT(db->db_state == DB_READ || 580fa9e4066Sahrens (flags & DB_RF_HAVESTRUCT) == 0); 581fa9e4066Sahrens cv_wait(&db->db_changed, &db->db_mtx); 582fa9e4066Sahrens } 583*ea8dc4b6Seschrock if (db->db_state == DB_UNCACHED) 584*ea8dc4b6Seschrock err = EIO; 585*ea8dc4b6Seschrock } 586fa9e4066Sahrens mutex_exit(&db->db_mtx); 587fa9e4066Sahrens } 588fa9e4066Sahrens 589*ea8dc4b6Seschrock ASSERT(err || havepzio || db->db_state == DB_CACHED); 590*ea8dc4b6Seschrock return (err); 591fa9e4066Sahrens } 592fa9e4066Sahrens 593fa9e4066Sahrens static void 594fa9e4066Sahrens dbuf_noread(dmu_buf_impl_t *db) 595fa9e4066Sahrens { 596fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 597*ea8dc4b6Seschrock ASSERT(db->db_blkid != DB_BONUS_BLKID); 598fa9e4066Sahrens mutex_enter(&db->db_mtx); 599fa9e4066Sahrens while (db->db_state == DB_READ || db->db_state == DB_FILL) 600fa9e4066Sahrens cv_wait(&db->db_changed, &db->db_mtx); 601fa9e4066Sahrens if (db->db_state == DB_UNCACHED) { 602*ea8dc4b6Seschrock ASSERT(db->db_buf == NULL); 603fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 604fa9e4066Sahrens dbuf_set_data(db, arc_buf_alloc(db->db_dnode->dn_objset->os_spa, 605*ea8dc4b6Seschrock db->db.db_size, db)); 606fa9e4066Sahrens db->db_state = DB_FILL; 607fa9e4066Sahrens } else { 608fa9e4066Sahrens ASSERT3U(db->db_state, ==, DB_CACHED); 609fa9e4066Sahrens } 610fa9e4066Sahrens mutex_exit(&db->db_mtx); 611fa9e4066Sahrens } 612fa9e4066Sahrens 613fa9e4066Sahrens /* 614fa9e4066Sahrens * This is our just-in-time copy function. It makes a copy of 615fa9e4066Sahrens * buffers, that have been modified in a previous transaction 616fa9e4066Sahrens * group, before we modify them in the current active group. 617fa9e4066Sahrens * 618fa9e4066Sahrens * This function is used in two places: when we are dirtying a 619fa9e4066Sahrens * buffer for the first time in a txg, and when we are freeing 620fa9e4066Sahrens * a range in a dnode that includes this buffer. 621fa9e4066Sahrens * 622fa9e4066Sahrens * Note that when we are called from dbuf_free_range() we do 623fa9e4066Sahrens * not put a hold on the buffer, we just traverse the active 624fa9e4066Sahrens * dbuf list for the dnode. 625fa9e4066Sahrens */ 626fa9e4066Sahrens static void 627fa9e4066Sahrens dbuf_fix_old_data(dmu_buf_impl_t *db, uint64_t txg) 628fa9e4066Sahrens { 629fa9e4066Sahrens arc_buf_t **quiescing, **syncing; 630fa9e4066Sahrens 631fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 632fa9e4066Sahrens ASSERT(db->db.db_data != NULL); 633*ea8dc4b6Seschrock ASSERT(db->db_blkid != DB_BONUS_BLKID); 634fa9e4066Sahrens 635*ea8dc4b6Seschrock quiescing = (arc_buf_t **)&db->db_d.db_data_old[(txg-1)&TXG_MASK]; 636*ea8dc4b6Seschrock syncing = (arc_buf_t **)&db->db_d.db_data_old[(txg-2)&TXG_MASK]; 637fa9e4066Sahrens 638fa9e4066Sahrens /* 639fa9e4066Sahrens * If this buffer is referenced from the current quiescing 640fa9e4066Sahrens * transaction group: either make a copy and reset the reference 641fa9e4066Sahrens * to point to the copy, or (if there a no active holders) just 642fa9e4066Sahrens * null out the current db_data pointer. 643fa9e4066Sahrens */ 644fa9e4066Sahrens if (*quiescing == db->db_buf) { 645fa9e4066Sahrens /* 646fa9e4066Sahrens * If the quiescing txg is "dirty", then we better not 647fa9e4066Sahrens * be referencing the same buffer from the syncing txg. 648fa9e4066Sahrens */ 649fa9e4066Sahrens ASSERT(*syncing != db->db_buf); 650fa9e4066Sahrens if (refcount_count(&db->db_holds) > db->db_dirtycnt) { 651*ea8dc4b6Seschrock int size = db->db.db_size; 652fa9e4066Sahrens *quiescing = arc_buf_alloc( 653fa9e4066Sahrens db->db_dnode->dn_objset->os_spa, size, db); 654fa9e4066Sahrens bcopy(db->db.db_data, (*quiescing)->b_data, size); 655fa9e4066Sahrens } else { 656*ea8dc4b6Seschrock dbuf_set_data(db, NULL); 657fa9e4066Sahrens } 658fa9e4066Sahrens return; 659fa9e4066Sahrens } 660fa9e4066Sahrens 661fa9e4066Sahrens /* 662fa9e4066Sahrens * If this buffer is referenced from the current syncing 663fa9e4066Sahrens * transaction group: either 664fa9e4066Sahrens * 1 - make a copy and reset the reference, or 665fa9e4066Sahrens * 2 - if there are no holders, just null the current db_data. 666fa9e4066Sahrens */ 667fa9e4066Sahrens if (*syncing == db->db_buf) { 668fa9e4066Sahrens ASSERT3P(*quiescing, ==, NULL); 669fa9e4066Sahrens ASSERT3U(db->db_dirtycnt, ==, 1); 670fa9e4066Sahrens if (refcount_count(&db->db_holds) > db->db_dirtycnt) { 671*ea8dc4b6Seschrock int size = db->db.db_size; 672fa9e4066Sahrens /* we can't copy if we have already started a write */ 673fa9e4066Sahrens ASSERT(*syncing != db->db_data_pending); 674fa9e4066Sahrens *syncing = arc_buf_alloc( 675fa9e4066Sahrens db->db_dnode->dn_objset->os_spa, size, db); 676fa9e4066Sahrens bcopy(db->db.db_data, (*syncing)->b_data, size); 677fa9e4066Sahrens } else { 678*ea8dc4b6Seschrock dbuf_set_data(db, NULL); 679fa9e4066Sahrens } 680fa9e4066Sahrens } 681fa9e4066Sahrens } 682fa9e4066Sahrens 683*ea8dc4b6Seschrock /* 684*ea8dc4b6Seschrock * This is the "bonus buffer" version of the above routine 685*ea8dc4b6Seschrock */ 686*ea8dc4b6Seschrock static void 687*ea8dc4b6Seschrock dbuf_fix_old_bonus_data(dmu_buf_impl_t *db, uint64_t txg) 688*ea8dc4b6Seschrock { 689*ea8dc4b6Seschrock void **quiescing, **syncing; 690*ea8dc4b6Seschrock 691*ea8dc4b6Seschrock ASSERT(MUTEX_HELD(&db->db_mtx)); 692*ea8dc4b6Seschrock ASSERT(db->db.db_data != NULL); 693*ea8dc4b6Seschrock ASSERT(db->db_blkid == DB_BONUS_BLKID); 694*ea8dc4b6Seschrock 695*ea8dc4b6Seschrock quiescing = &db->db_d.db_data_old[(txg-1)&TXG_MASK]; 696*ea8dc4b6Seschrock syncing = &db->db_d.db_data_old[(txg-2)&TXG_MASK]; 697*ea8dc4b6Seschrock 698*ea8dc4b6Seschrock if (*quiescing == db->db.db_data) { 699*ea8dc4b6Seschrock ASSERT(*syncing != db->db.db_data); 700*ea8dc4b6Seschrock *quiescing = zio_buf_alloc(DN_MAX_BONUSLEN); 701*ea8dc4b6Seschrock bcopy(db->db.db_data, *quiescing, DN_MAX_BONUSLEN); 702*ea8dc4b6Seschrock } else if (*syncing == db->db.db_data) { 703*ea8dc4b6Seschrock ASSERT3P(*quiescing, ==, NULL); 704*ea8dc4b6Seschrock ASSERT3U(db->db_dirtycnt, ==, 1); 705*ea8dc4b6Seschrock *syncing = zio_buf_alloc(DN_MAX_BONUSLEN); 706*ea8dc4b6Seschrock bcopy(db->db.db_data, *syncing, DN_MAX_BONUSLEN); 707*ea8dc4b6Seschrock } 708*ea8dc4b6Seschrock } 709*ea8dc4b6Seschrock 710fa9e4066Sahrens void 711fa9e4066Sahrens dbuf_unoverride(dmu_buf_impl_t *db, uint64_t txg) 712fa9e4066Sahrens { 713*ea8dc4b6Seschrock ASSERT(db->db_blkid != DB_BONUS_BLKID); 714fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 715fa9e4066Sahrens if (db->db_d.db_overridden_by[txg&TXG_MASK] == IN_DMU_SYNC) { 716fa9e4066Sahrens db->db_d.db_overridden_by[txg&TXG_MASK] = NULL; 717fa9e4066Sahrens } else if (db->db_d.db_overridden_by[txg&TXG_MASK] != NULL) { 718fa9e4066Sahrens /* free this block */ 719fa9e4066Sahrens ASSERT(list_link_active(&db->db_dirty_node[txg&TXG_MASK]) || 720fa9e4066Sahrens db->db_dnode->dn_free_txg == txg); 721fa9e4066Sahrens if (!BP_IS_HOLE(db->db_d.db_overridden_by[txg&TXG_MASK])) { 722fa9e4066Sahrens /* XXX can get silent EIO here */ 723fa9e4066Sahrens (void) arc_free(NULL, db->db_dnode->dn_objset->os_spa, 724fa9e4066Sahrens txg, db->db_d.db_overridden_by[txg&TXG_MASK], 725fa9e4066Sahrens NULL, NULL, ARC_WAIT); 726fa9e4066Sahrens } 727fa9e4066Sahrens kmem_free(db->db_d.db_overridden_by[txg&TXG_MASK], 728fa9e4066Sahrens sizeof (blkptr_t)); 729fa9e4066Sahrens db->db_d.db_overridden_by[txg&TXG_MASK] = NULL; 730fa9e4066Sahrens /* release the already-written buffer */ 731fa9e4066Sahrens arc_release(db->db_d.db_data_old[txg&TXG_MASK], db); 732fa9e4066Sahrens } 733fa9e4066Sahrens } 734fa9e4066Sahrens 735fa9e4066Sahrens void 736fa9e4066Sahrens dbuf_free_range(dnode_t *dn, uint64_t blkid, uint64_t nblks, dmu_tx_t *tx) 737fa9e4066Sahrens { 738fa9e4066Sahrens dmu_buf_impl_t *db, *db_next; 739fa9e4066Sahrens uint64_t txg = tx->tx_txg; 740fa9e4066Sahrens 741fa9e4066Sahrens dprintf_dnode(dn, "blkid=%llu nblks=%llu\n", blkid, nblks); 742fa9e4066Sahrens mutex_enter(&dn->dn_dbufs_mtx); 743fa9e4066Sahrens for (db = list_head(&dn->dn_dbufs); db; db = db_next) { 744fa9e4066Sahrens db_next = list_next(&dn->dn_dbufs, db); 745*ea8dc4b6Seschrock ASSERT(db->db_blkid != DB_BONUS_BLKID); 746*ea8dc4b6Seschrock if (db->db_level != 0) 747fa9e4066Sahrens continue; 748fa9e4066Sahrens dprintf_dbuf(db, "found buf %s\n", ""); 749fa9e4066Sahrens if (db->db_blkid < blkid || 750fa9e4066Sahrens db->db_blkid >= blkid+nblks) 751fa9e4066Sahrens continue; 752fa9e4066Sahrens 753fa9e4066Sahrens /* found a level 0 buffer in the range */ 754fa9e4066Sahrens if (dbuf_undirty(db, tx)) 755fa9e4066Sahrens continue; 756fa9e4066Sahrens 757fa9e4066Sahrens mutex_enter(&db->db_mtx); 758*ea8dc4b6Seschrock if (db->db_state == DB_UNCACHED || 759*ea8dc4b6Seschrock db->db_state == DB_EVICTING) { 760fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 761fa9e4066Sahrens mutex_exit(&db->db_mtx); 762fa9e4066Sahrens continue; 763fa9e4066Sahrens } 764fa9e4066Sahrens if (db->db_state == DB_READ) { 765fa9e4066Sahrens /* this will be handled in dbuf_read_done() */ 766fa9e4066Sahrens db->db_d.db_freed_in_flight = TRUE; 767fa9e4066Sahrens mutex_exit(&db->db_mtx); 768fa9e4066Sahrens continue; 769fa9e4066Sahrens } 770fa9e4066Sahrens if (db->db_state == DB_FILL) { 771fa9e4066Sahrens /* this will be handled in dbuf_rele() */ 772fa9e4066Sahrens db->db_d.db_freed_in_flight = TRUE; 773fa9e4066Sahrens mutex_exit(&db->db_mtx); 774fa9e4066Sahrens continue; 775fa9e4066Sahrens } 776*ea8dc4b6Seschrock if (refcount_count(&db->db_holds) == 0) { 777*ea8dc4b6Seschrock ASSERT(db->db_buf); 778*ea8dc4b6Seschrock dbuf_clear(db); 779*ea8dc4b6Seschrock continue; 780*ea8dc4b6Seschrock } 781*ea8dc4b6Seschrock /* The dbuf is CACHED and referenced */ 782fa9e4066Sahrens 783*ea8dc4b6Seschrock if (!list_link_active(&db->db_dirty_node[txg & TXG_MASK])) { 784*ea8dc4b6Seschrock /* 785*ea8dc4b6Seschrock * This dbuf is not currently dirty. We will either 786*ea8dc4b6Seschrock * uncache it (if its not referenced in the open 787*ea8dc4b6Seschrock * context) or reset its contents to empty. 788*ea8dc4b6Seschrock */ 789fa9e4066Sahrens dbuf_fix_old_data(db, txg); 790*ea8dc4b6Seschrock } else if (db->db_d.db_overridden_by[txg & TXG_MASK] != NULL) { 791*ea8dc4b6Seschrock /* 792*ea8dc4b6Seschrock * This dbuf is overridden. Clear that state. 793*ea8dc4b6Seschrock */ 794*ea8dc4b6Seschrock dbuf_unoverride(db, txg); 795*ea8dc4b6Seschrock } 796fa9e4066Sahrens /* fill in with appropriate data */ 797*ea8dc4b6Seschrock if (db->db_state == DB_CACHED) { 798*ea8dc4b6Seschrock ASSERT(db->db.db_data != NULL); 799fa9e4066Sahrens arc_release(db->db_buf, db); 800fa9e4066Sahrens bzero(db->db.db_data, db->db.db_size); 801fa9e4066Sahrens } 802*ea8dc4b6Seschrock 803fa9e4066Sahrens mutex_exit(&db->db_mtx); 804fa9e4066Sahrens } 805fa9e4066Sahrens mutex_exit(&dn->dn_dbufs_mtx); 806fa9e4066Sahrens } 807fa9e4066Sahrens 808fa9e4066Sahrens static int 809*ea8dc4b6Seschrock dbuf_new_block(dmu_buf_impl_t *db) 810fa9e4066Sahrens { 811fa9e4066Sahrens dsl_dataset_t *ds = db->db_objset->os_dsl_dataset; 812fa9e4066Sahrens uint64_t birth_txg = 0; 813fa9e4066Sahrens 814fa9e4066Sahrens /* Don't count meta-objects */ 815fa9e4066Sahrens if (ds == NULL) 816fa9e4066Sahrens return (FALSE); 817fa9e4066Sahrens 818fa9e4066Sahrens /* 819fa9e4066Sahrens * We don't need any locking to protect db_blkptr: 820fa9e4066Sahrens * If it's syncing, then db_dirtied will be set so we'll 821fa9e4066Sahrens * ignore db_blkptr. 822fa9e4066Sahrens */ 823fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); /* XXX strictly necessary? */ 824fa9e4066Sahrens /* If we have been dirtied since the last snapshot, its not new */ 825fa9e4066Sahrens if (db->db_dirtied) 826fa9e4066Sahrens birth_txg = db->db_dirtied; 827fa9e4066Sahrens else if (db->db_blkptr) 828fa9e4066Sahrens birth_txg = db->db_blkptr->blk_birth; 829fa9e4066Sahrens 830fa9e4066Sahrens if (birth_txg) 831*ea8dc4b6Seschrock return (!dsl_dataset_block_freeable(ds, birth_txg)); 832fa9e4066Sahrens else 833fa9e4066Sahrens return (TRUE); 834fa9e4066Sahrens } 835fa9e4066Sahrens 836fa9e4066Sahrens void 837fa9e4066Sahrens dbuf_new_size(dmu_buf_impl_t *db, int size, dmu_tx_t *tx) 838fa9e4066Sahrens { 839fa9e4066Sahrens arc_buf_t *buf, *obuf; 840fa9e4066Sahrens int osize = db->db.db_size; 841fa9e4066Sahrens 842*ea8dc4b6Seschrock ASSERT(db->db_blkid != DB_BONUS_BLKID); 843*ea8dc4b6Seschrock 844fa9e4066Sahrens /* XXX does *this* func really need the lock? */ 845fa9e4066Sahrens ASSERT(RW_WRITE_HELD(&db->db_dnode->dn_struct_rwlock)); 846fa9e4066Sahrens 847fa9e4066Sahrens if (osize == size) 848fa9e4066Sahrens return; 849fa9e4066Sahrens 850fa9e4066Sahrens /* 851fa9e4066Sahrens * This call to dbuf_will_dirty() with the dn_struct_rwlock held 852fa9e4066Sahrens * is OK, because there can be no other references to the db 853fa9e4066Sahrens * when we are changing its size, so no concurrent DB_FILL can 854fa9e4066Sahrens * be happening. 855fa9e4066Sahrens */ 856fa9e4066Sahrens /* Make a copy of the data if necessary */ 857*ea8dc4b6Seschrock /* 858*ea8dc4b6Seschrock * XXX we should be doing a dbuf_read, checking the return 859*ea8dc4b6Seschrock * value and returning that up to our callers 860*ea8dc4b6Seschrock */ 861fa9e4066Sahrens dbuf_will_dirty(db, tx); 862fa9e4066Sahrens 863fa9e4066Sahrens /* create the data buffer for the new block */ 864fa9e4066Sahrens buf = arc_buf_alloc(db->db_dnode->dn_objset->os_spa, size, db); 865fa9e4066Sahrens 866fa9e4066Sahrens /* copy old block data to the new block */ 867fa9e4066Sahrens obuf = db->db_buf; 868f65e61c0Sahrens bcopy(obuf->b_data, buf->b_data, MIN(osize, size)); 869fa9e4066Sahrens /* zero the remainder */ 870f65e61c0Sahrens if (size > osize) 871fa9e4066Sahrens bzero((uint8_t *)buf->b_data + osize, size - osize); 872fa9e4066Sahrens 873fa9e4066Sahrens mutex_enter(&db->db_mtx); 874fa9e4066Sahrens /* ASSERT3U(refcount_count(&db->db_holds), ==, 1); */ 875fa9e4066Sahrens dbuf_set_data(db, buf); 876*ea8dc4b6Seschrock VERIFY(arc_buf_remove_ref(obuf, db) == 1); 877fa9e4066Sahrens db->db.db_size = size; 878fa9e4066Sahrens 879fa9e4066Sahrens /* fix up the dirty info */ 880fa9e4066Sahrens if (db->db_level == 0) 881fa9e4066Sahrens db->db_d.db_data_old[tx->tx_txg&TXG_MASK] = buf; 882fa9e4066Sahrens mutex_exit(&db->db_mtx); 883fa9e4066Sahrens 884fa9e4066Sahrens dnode_willuse_space(db->db_dnode, size-osize, tx); 885fa9e4066Sahrens } 886fa9e4066Sahrens 887fa9e4066Sahrens void 888fa9e4066Sahrens dbuf_dirty(dmu_buf_impl_t *db, dmu_tx_t *tx) 889fa9e4066Sahrens { 890fa9e4066Sahrens dnode_t *dn = db->db_dnode; 891fa9e4066Sahrens objset_impl_t *os = dn->dn_objset; 892fa9e4066Sahrens int drop_struct_lock = FALSE; 893fa9e4066Sahrens int txgoff = tx->tx_txg & TXG_MASK; 894fa9e4066Sahrens 895fa9e4066Sahrens ASSERT(tx->tx_txg != 0); 896fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 8979c9dc39aSek110237 DMU_TX_DIRTY_BUF(tx, db); 898fa9e4066Sahrens 899fa9e4066Sahrens /* 900fa9e4066Sahrens * Shouldn't dirty a regular buffer in syncing context. Private 901fa9e4066Sahrens * objects may be dirtied in syncing context, but only if they 902fa9e4066Sahrens * were already pre-dirtied in open context. 903fa9e4066Sahrens * XXX We may want to prohibit dirtying in syncing context even 904fa9e4066Sahrens * if they did pre-dirty. 905fa9e4066Sahrens */ 906fa9e4066Sahrens ASSERT(!(dmu_tx_is_syncing(tx) && 907fa9e4066Sahrens !BP_IS_HOLE(&dn->dn_objset->os_rootbp) && 908*ea8dc4b6Seschrock dn->dn_object != DMU_META_DNODE_OBJECT && 909fa9e4066Sahrens dn->dn_objset->os_dsl_dataset != NULL && 910fa9e4066Sahrens !dsl_dir_is_private( 911fa9e4066Sahrens dn->dn_objset->os_dsl_dataset->ds_dir))); 912fa9e4066Sahrens 913fa9e4066Sahrens /* 914fa9e4066Sahrens * We make this assert for private objects as well, but after we 915fa9e4066Sahrens * check if we're already dirty. They are allowed to re-dirty 916fa9e4066Sahrens * in syncing context. 917fa9e4066Sahrens */ 918*ea8dc4b6Seschrock ASSERT(dn->dn_object == DMU_META_DNODE_OBJECT || 919fa9e4066Sahrens dn->dn_dirtyctx == DN_UNDIRTIED || 920fa9e4066Sahrens dn->dn_dirtyctx == 921fa9e4066Sahrens (dmu_tx_is_syncing(tx) ? DN_DIRTY_SYNC : DN_DIRTY_OPEN)); 922fa9e4066Sahrens 923fa9e4066Sahrens mutex_enter(&db->db_mtx); 924fa9e4066Sahrens /* XXX make this true for indirects too? */ 925fa9e4066Sahrens ASSERT(db->db_level != 0 || db->db_state == DB_CACHED || 926fa9e4066Sahrens db->db_state == DB_FILL); 927fa9e4066Sahrens 928fa9e4066Sahrens /* 929fa9e4066Sahrens * If this buffer is currently part of an "overridden" region, 930fa9e4066Sahrens * we now need to remove it from that region. 931fa9e4066Sahrens */ 932fa9e4066Sahrens if (db->db_level == 0 && db->db_blkid != DB_BONUS_BLKID && 933fa9e4066Sahrens db->db_d.db_overridden_by[txgoff] != NULL) { 934fa9e4066Sahrens dbuf_unoverride(db, tx->tx_txg); 935fa9e4066Sahrens } 936fa9e4066Sahrens 937fa9e4066Sahrens mutex_enter(&dn->dn_mtx); 938fa9e4066Sahrens /* 939fa9e4066Sahrens * Don't set dirtyctx to SYNC if we're just modifying this as we 940fa9e4066Sahrens * initialize the objset. 941fa9e4066Sahrens */ 942fa9e4066Sahrens if (dn->dn_dirtyctx == DN_UNDIRTIED && 943fa9e4066Sahrens !BP_IS_HOLE(&dn->dn_objset->os_rootbp)) { 944fa9e4066Sahrens dn->dn_dirtyctx = 945fa9e4066Sahrens (dmu_tx_is_syncing(tx) ? DN_DIRTY_SYNC : DN_DIRTY_OPEN); 946fa9e4066Sahrens ASSERT(dn->dn_dirtyctx_firstset == NULL); 947fa9e4066Sahrens dn->dn_dirtyctx_firstset = kmem_alloc(1, KM_SLEEP); 948fa9e4066Sahrens } 949fa9e4066Sahrens mutex_exit(&dn->dn_mtx); 950fa9e4066Sahrens 951fa9e4066Sahrens /* 952fa9e4066Sahrens * If this buffer is already dirty, we're done. 953fa9e4066Sahrens */ 954fa9e4066Sahrens if (list_link_active(&db->db_dirty_node[txgoff])) { 955fa9e4066Sahrens mutex_exit(&db->db_mtx); 956fa9e4066Sahrens return; 957fa9e4066Sahrens } 958fa9e4066Sahrens 959fa9e4066Sahrens /* 960fa9e4066Sahrens * Only valid if not already dirty. 961fa9e4066Sahrens */ 962fa9e4066Sahrens ASSERT(dn->dn_dirtyctx == DN_UNDIRTIED || dn->dn_dirtyctx == 963fa9e4066Sahrens (dmu_tx_is_syncing(tx) ? DN_DIRTY_SYNC : DN_DIRTY_OPEN)); 964fa9e4066Sahrens 965fa9e4066Sahrens ASSERT3U(dn->dn_nlevels, >, db->db_level); 966fa9e4066Sahrens ASSERT((dn->dn_phys->dn_nlevels == 0 && db->db_level == 0) || 967fa9e4066Sahrens dn->dn_phys->dn_nlevels > db->db_level || 968fa9e4066Sahrens dn->dn_next_nlevels[txgoff] > db->db_level || 969fa9e4066Sahrens dn->dn_next_nlevels[(tx->tx_txg-1) & TXG_MASK] > db->db_level || 970fa9e4066Sahrens dn->dn_next_nlevels[(tx->tx_txg-2) & TXG_MASK] > db->db_level); 971fa9e4066Sahrens 972fa9e4066Sahrens /* 973fa9e4066Sahrens * We should only be dirtying in syncing context if it's the 974fa9e4066Sahrens * mos, a spa os, or we're initializing the os. However, we are 975fa9e4066Sahrens * allowed to dirty in syncing context provided we already 976fa9e4066Sahrens * dirtied it in open context. Hence we must make this 977fa9e4066Sahrens * assertion only if we're not already dirty. 978fa9e4066Sahrens */ 979fa9e4066Sahrens ASSERT(!dmu_tx_is_syncing(tx) || 980fa9e4066Sahrens os->os_dsl_dataset == NULL || 981fa9e4066Sahrens !dsl_dir_is_private(os->os_dsl_dataset->ds_dir) || 982fa9e4066Sahrens !BP_IS_HOLE(&os->os_rootbp)); 983fa9e4066Sahrens ASSERT(db->db.db_size != 0); 984fa9e4066Sahrens 985fa9e4066Sahrens dprintf_dbuf(db, "size=%llx\n", (u_longlong_t)db->db.db_size); 986fa9e4066Sahrens 987*ea8dc4b6Seschrock /* 988*ea8dc4b6Seschrock * If this buffer is dirty in an old transaction group we need 989*ea8dc4b6Seschrock * to make a copy of it so that the changes we make in this 990*ea8dc4b6Seschrock * transaction group won't leak out when we sync the older txg. 991*ea8dc4b6Seschrock */ 992*ea8dc4b6Seschrock if (db->db_blkid == DB_BONUS_BLKID) { 993*ea8dc4b6Seschrock ASSERT(db->db.db_data != NULL); 994*ea8dc4b6Seschrock ASSERT(db->db_d.db_data_old[txgoff] == NULL); 995*ea8dc4b6Seschrock dbuf_fix_old_bonus_data(db, tx->tx_txg); 996*ea8dc4b6Seschrock db->db_d.db_data_old[txgoff] = db->db.db_data; 997*ea8dc4b6Seschrock } else if (db->db_level == 0) { 998fa9e4066Sahrens /* 999fa9e4066Sahrens * Release the data buffer from the cache so that we 1000fa9e4066Sahrens * can modify it without impacting possible other users 1001fa9e4066Sahrens * of this cached data block. Note that indirect blocks 1002fa9e4066Sahrens * and private objects are not released until the syncing 1003fa9e4066Sahrens * state (since they are only modified then). 1004fa9e4066Sahrens */ 1005fa9e4066Sahrens ASSERT(db->db_buf != NULL); 1006fa9e4066Sahrens ASSERT(db->db_d.db_data_old[txgoff] == NULL); 1007*ea8dc4b6Seschrock if (db->db.db_object != DMU_META_DNODE_OBJECT) { 1008fa9e4066Sahrens arc_release(db->db_buf, db); 1009fa9e4066Sahrens dbuf_fix_old_data(db, tx->tx_txg); 1010fa9e4066Sahrens ASSERT(db->db_buf != NULL); 1011fa9e4066Sahrens } 1012fa9e4066Sahrens db->db_d.db_data_old[txgoff] = db->db_buf; 1013fa9e4066Sahrens } 1014fa9e4066Sahrens 1015fa9e4066Sahrens mutex_enter(&dn->dn_mtx); 1016fa9e4066Sahrens /* 1017fa9e4066Sahrens * We could have been freed_in_flight between the dbuf_noread 1018fa9e4066Sahrens * and dbuf_dirty. We win, as though the dbuf_noread() had 1019fa9e4066Sahrens * happened after the free. 1020fa9e4066Sahrens */ 1021fa9e4066Sahrens if (db->db_level == 0 && db->db_blkid != DB_BONUS_BLKID) { 1022fa9e4066Sahrens dnode_clear_range(dn, db->db_blkid, 1, tx); 1023fa9e4066Sahrens db->db_d.db_freed_in_flight = FALSE; 1024fa9e4066Sahrens } 1025fa9e4066Sahrens 1026fa9e4066Sahrens db->db_dirtied = tx->tx_txg; 1027fa9e4066Sahrens list_insert_tail(&dn->dn_dirty_dbufs[txgoff], db); 1028fa9e4066Sahrens mutex_exit(&dn->dn_mtx); 1029fa9e4066Sahrens 1030fa9e4066Sahrens if (db->db_blkid != DB_BONUS_BLKID) { 1031*ea8dc4b6Seschrock /* 1032*ea8dc4b6Seschrock * Update the accounting. 1033*ea8dc4b6Seschrock */ 1034*ea8dc4b6Seschrock if (!dbuf_new_block(db) && db->db_blkptr) { 1035fa9e4066Sahrens /* 1036fa9e4066Sahrens * This is only a guess -- if the dbuf is dirty 1037fa9e4066Sahrens * in a previous txg, we don't know how much 1038fa9e4066Sahrens * space it will use on disk yet. We should 1039fa9e4066Sahrens * really have the struct_rwlock to access 1040fa9e4066Sahrens * db_blkptr, but since this is just a guess, 1041fa9e4066Sahrens * it's OK if we get an odd answer. 1042fa9e4066Sahrens */ 1043fa9e4066Sahrens dnode_willuse_space(dn, 1044fa9e4066Sahrens -BP_GET_ASIZE(db->db_blkptr), tx); 1045fa9e4066Sahrens } 1046fa9e4066Sahrens dnode_willuse_space(dn, db->db.db_size, tx); 1047fa9e4066Sahrens } 1048fa9e4066Sahrens 1049fa9e4066Sahrens /* 1050fa9e4066Sahrens * This buffer is now part of this txg 1051fa9e4066Sahrens */ 1052fa9e4066Sahrens dbuf_add_ref(db, (void *)(uintptr_t)tx->tx_txg); 1053fa9e4066Sahrens db->db_dirtycnt += 1; 1054fa9e4066Sahrens ASSERT3U(db->db_dirtycnt, <=, 3); 1055fa9e4066Sahrens 1056fa9e4066Sahrens mutex_exit(&db->db_mtx); 1057fa9e4066Sahrens 1058fa9e4066Sahrens if (db->db_blkid == DB_BONUS_BLKID) { 1059fa9e4066Sahrens dnode_setdirty(dn, tx); 1060fa9e4066Sahrens return; 1061fa9e4066Sahrens } 1062fa9e4066Sahrens 1063fa9e4066Sahrens if (db->db_level == 0) 1064fa9e4066Sahrens dnode_new_blkid(dn, db->db_blkid, tx); 1065fa9e4066Sahrens 1066fa9e4066Sahrens if (!RW_WRITE_HELD(&dn->dn_struct_rwlock)) { 1067fa9e4066Sahrens rw_enter(&dn->dn_struct_rwlock, RW_READER); 1068fa9e4066Sahrens drop_struct_lock = TRUE; 1069fa9e4066Sahrens } 1070fa9e4066Sahrens 1071fa9e4066Sahrens if (db->db_level < dn->dn_nlevels-1) { 1072fa9e4066Sahrens int epbs = dn->dn_indblkshift - SPA_BLKPTRSHIFT; 1073fa9e4066Sahrens dmu_buf_impl_t *parent; 1074fa9e4066Sahrens parent = dbuf_hold_level(dn, db->db_level+1, 1075fa9e4066Sahrens db->db_blkid >> epbs, FTAG); 1076fa9e4066Sahrens if (drop_struct_lock) 1077fa9e4066Sahrens rw_exit(&dn->dn_struct_rwlock); 1078fa9e4066Sahrens dbuf_dirty(parent, tx); 1079*ea8dc4b6Seschrock dbuf_rele(parent, FTAG); 1080fa9e4066Sahrens } else { 1081fa9e4066Sahrens if (drop_struct_lock) 1082fa9e4066Sahrens rw_exit(&dn->dn_struct_rwlock); 1083fa9e4066Sahrens } 1084fa9e4066Sahrens 1085fa9e4066Sahrens dnode_setdirty(dn, tx); 1086fa9e4066Sahrens } 1087fa9e4066Sahrens 1088fa9e4066Sahrens static int 1089fa9e4066Sahrens dbuf_undirty(dmu_buf_impl_t *db, dmu_tx_t *tx) 1090fa9e4066Sahrens { 1091fa9e4066Sahrens dnode_t *dn = db->db_dnode; 1092fa9e4066Sahrens int txgoff = tx->tx_txg & TXG_MASK; 1093*ea8dc4b6Seschrock int64_t holds; 1094fa9e4066Sahrens 1095fa9e4066Sahrens ASSERT(tx->tx_txg != 0); 1096*ea8dc4b6Seschrock ASSERT(db->db_blkid != DB_BONUS_BLKID); 1097fa9e4066Sahrens 1098fa9e4066Sahrens mutex_enter(&db->db_mtx); 1099fa9e4066Sahrens 1100fa9e4066Sahrens /* 1101fa9e4066Sahrens * If this buffer is not dirty, we're done. 1102fa9e4066Sahrens */ 1103fa9e4066Sahrens if (!list_link_active(&db->db_dirty_node[txgoff])) { 1104fa9e4066Sahrens mutex_exit(&db->db_mtx); 1105fa9e4066Sahrens return (0); 1106fa9e4066Sahrens } 1107fa9e4066Sahrens 1108fa9e4066Sahrens /* 1109fa9e4066Sahrens * If this buffer is currently held, we cannot undirty 1110fa9e4066Sahrens * it, since one of the current holders may be in the 1111fa9e4066Sahrens * middle of an update. Note that users of dbuf_undirty() 1112fa9e4066Sahrens * should not place a hold on the dbuf before the call. 1113fa9e4066Sahrens * XXX - this check assumes we are being called from 1114fa9e4066Sahrens * dbuf_free_range(), perhaps we should move it there? 1115fa9e4066Sahrens */ 1116fa9e4066Sahrens if (refcount_count(&db->db_holds) > db->db_dirtycnt) { 1117fa9e4066Sahrens mutex_exit(&db->db_mtx); 1118fa9e4066Sahrens mutex_enter(&dn->dn_mtx); 1119fa9e4066Sahrens dnode_clear_range(dn, db->db_blkid, 1, tx); 1120fa9e4066Sahrens mutex_exit(&dn->dn_mtx); 1121fa9e4066Sahrens return (0); 1122fa9e4066Sahrens } 1123fa9e4066Sahrens 1124fa9e4066Sahrens dprintf_dbuf(db, "size=%llx\n", (u_longlong_t)db->db.db_size); 1125fa9e4066Sahrens 1126fa9e4066Sahrens dbuf_unoverride(db, tx->tx_txg); 1127fa9e4066Sahrens 1128fa9e4066Sahrens ASSERT(db->db.db_size != 0); 1129fa9e4066Sahrens if (db->db_level == 0) { 1130fa9e4066Sahrens ASSERT(db->db_buf != NULL); 1131fa9e4066Sahrens ASSERT(db->db_d.db_data_old[txgoff] != NULL); 1132fa9e4066Sahrens if (db->db_d.db_data_old[txgoff] != db->db_buf) 1133*ea8dc4b6Seschrock VERIFY(arc_buf_remove_ref( 1134*ea8dc4b6Seschrock db->db_d.db_data_old[txgoff], db) == 1); 1135fa9e4066Sahrens db->db_d.db_data_old[txgoff] = NULL; 1136fa9e4066Sahrens } 1137fa9e4066Sahrens 1138fa9e4066Sahrens /* XXX would be nice to fix up dn_towrite_space[] */ 1139fa9e4066Sahrens /* XXX undo db_dirtied? but how? */ 1140fa9e4066Sahrens /* db->db_dirtied = tx->tx_txg; */ 1141fa9e4066Sahrens 1142fa9e4066Sahrens mutex_enter(&dn->dn_mtx); 1143fa9e4066Sahrens list_remove(&dn->dn_dirty_dbufs[txgoff], db); 1144fa9e4066Sahrens mutex_exit(&dn->dn_mtx); 1145fa9e4066Sahrens 1146fa9e4066Sahrens ASSERT(db->db_dirtycnt > 0); 1147fa9e4066Sahrens db->db_dirtycnt -= 1; 1148fa9e4066Sahrens 1149*ea8dc4b6Seschrock if ((holds = refcount_remove(&db->db_holds, 1150*ea8dc4b6Seschrock (void *)(uintptr_t)tx->tx_txg)) == 0) { 1151*ea8dc4b6Seschrock arc_buf_t *buf = db->db_buf; 1152fa9e4066Sahrens 1153*ea8dc4b6Seschrock ASSERT(arc_released(buf)); 1154*ea8dc4b6Seschrock dbuf_set_data(db, NULL); 1155*ea8dc4b6Seschrock VERIFY(arc_buf_remove_ref(buf, db) == 1); 1156fa9e4066Sahrens dbuf_evict(db); 1157fa9e4066Sahrens return (1); 1158fa9e4066Sahrens } 1159*ea8dc4b6Seschrock ASSERT(holds > 0); 1160fa9e4066Sahrens 1161fa9e4066Sahrens mutex_exit(&db->db_mtx); 1162fa9e4066Sahrens return (0); 1163fa9e4066Sahrens } 1164fa9e4066Sahrens 1165fa9e4066Sahrens #pragma weak dmu_buf_will_dirty = dbuf_will_dirty 1166fa9e4066Sahrens void 1167fa9e4066Sahrens dbuf_will_dirty(dmu_buf_impl_t *db, dmu_tx_t *tx) 1168fa9e4066Sahrens { 1169fa9e4066Sahrens int rf = DB_RF_MUST_SUCCEED; 1170fa9e4066Sahrens 1171fa9e4066Sahrens ASSERT(tx->tx_txg != 0); 1172fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 1173fa9e4066Sahrens 1174fa9e4066Sahrens if (RW_WRITE_HELD(&db->db_dnode->dn_struct_rwlock)) 1175fa9e4066Sahrens rf |= DB_RF_HAVESTRUCT; 1176*ea8dc4b6Seschrock (void) dbuf_read(db, NULL, rf); 1177fa9e4066Sahrens dbuf_dirty(db, tx); 1178fa9e4066Sahrens } 1179fa9e4066Sahrens 1180fa9e4066Sahrens void 1181*ea8dc4b6Seschrock dmu_buf_will_fill(dmu_buf_t *db_fake, dmu_tx_t *tx) 1182fa9e4066Sahrens { 1183*ea8dc4b6Seschrock dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 1184*ea8dc4b6Seschrock 1185*ea8dc4b6Seschrock ASSERT(db->db_blkid != DB_BONUS_BLKID); 1186fa9e4066Sahrens ASSERT(tx->tx_txg != 0); 1187fa9e4066Sahrens ASSERT(db->db_level == 0); 1188fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 1189fa9e4066Sahrens 1190*ea8dc4b6Seschrock ASSERT(db->db.db_object != DMU_META_DNODE_OBJECT || 1191fa9e4066Sahrens dmu_tx_private_ok(tx)); 1192fa9e4066Sahrens 1193fa9e4066Sahrens dbuf_noread(db); 1194fa9e4066Sahrens dbuf_dirty(db, tx); 1195fa9e4066Sahrens } 1196fa9e4066Sahrens 1197fa9e4066Sahrens #pragma weak dmu_buf_fill_done = dbuf_fill_done 1198fa9e4066Sahrens /* ARGSUSED */ 1199fa9e4066Sahrens void 1200fa9e4066Sahrens dbuf_fill_done(dmu_buf_impl_t *db, dmu_tx_t *tx) 1201fa9e4066Sahrens { 1202fa9e4066Sahrens mutex_enter(&db->db_mtx); 12039c9dc39aSek110237 DBUF_VERIFY(db); 1204fa9e4066Sahrens 1205fa9e4066Sahrens if (db->db_state == DB_FILL) { 1206fa9e4066Sahrens if (db->db_level == 0 && db->db_d.db_freed_in_flight) { 1207*ea8dc4b6Seschrock ASSERT(db->db_blkid != DB_BONUS_BLKID); 1208fa9e4066Sahrens /* we were freed while filling */ 1209fa9e4066Sahrens /* XXX dbuf_undirty? */ 1210fa9e4066Sahrens bzero(db->db.db_data, db->db.db_size); 1211fa9e4066Sahrens db->db_d.db_freed_in_flight = FALSE; 1212fa9e4066Sahrens } 1213fa9e4066Sahrens db->db_state = DB_CACHED; 1214fa9e4066Sahrens cv_broadcast(&db->db_changed); 1215fa9e4066Sahrens } 1216fa9e4066Sahrens mutex_exit(&db->db_mtx); 1217fa9e4066Sahrens } 1218fa9e4066Sahrens 1219*ea8dc4b6Seschrock /* 1220*ea8dc4b6Seschrock * "Clear" the contents of this dbuf. This will mark the dbuf 1221*ea8dc4b6Seschrock * EVICTING and clear *most* of its references. Unfortunetely, 1222*ea8dc4b6Seschrock * when we are not holding the dn_dbufs_mtx, we can't clear the 1223*ea8dc4b6Seschrock * entry in the dn_dbufs list. We have to wait until dbuf_destroy() 1224*ea8dc4b6Seschrock * in this case. For callers from the DMU we will usually see: 1225*ea8dc4b6Seschrock * dbuf_clear()->arc_buf_evict()->dbuf_do_evict()->dbuf_destroy() 1226*ea8dc4b6Seschrock * For the arc callback, we will usually see: 1227*ea8dc4b6Seschrock * dbuf_do_evict()->dbuf_clear();dbuf_destroy() 1228*ea8dc4b6Seschrock * Sometimes, though, we will get a mix of these two: 1229*ea8dc4b6Seschrock * DMU: dbuf_clear()->arc_buf_evict() 1230*ea8dc4b6Seschrock * ARC: dbuf_do_evict()->dbuf_destroy() 1231*ea8dc4b6Seschrock */ 1232*ea8dc4b6Seschrock void 1233fa9e4066Sahrens dbuf_clear(dmu_buf_impl_t *db) 1234fa9e4066Sahrens { 1235fa9e4066Sahrens dnode_t *dn = db->db_dnode; 1236*ea8dc4b6Seschrock dmu_buf_impl_t *parent = db->db_parent; 1237*ea8dc4b6Seschrock int dbuf_gone = FALSE; 1238fa9e4066Sahrens 1239fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 1240fa9e4066Sahrens ASSERT(refcount_is_zero(&db->db_holds)); 1241fa9e4066Sahrens 1242*ea8dc4b6Seschrock dbuf_evict_user(db); 1243*ea8dc4b6Seschrock 1244fa9e4066Sahrens if (db->db_state == DB_CACHED) { 1245*ea8dc4b6Seschrock ASSERT(db->db.db_data != NULL); 1246*ea8dc4b6Seschrock if (db->db_blkid == DB_BONUS_BLKID) 1247*ea8dc4b6Seschrock zio_buf_free(db->db.db_data, DN_MAX_BONUSLEN); 1248fa9e4066Sahrens db->db.db_data = NULL; 1249fa9e4066Sahrens db->db_state = DB_UNCACHED; 1250fa9e4066Sahrens } 1251fa9e4066Sahrens 1252fa9e4066Sahrens ASSERT3U(db->db_state, ==, DB_UNCACHED); 1253fa9e4066Sahrens ASSERT(db->db_data_pending == NULL); 1254fa9e4066Sahrens 1255*ea8dc4b6Seschrock db->db_state = DB_EVICTING; 1256*ea8dc4b6Seschrock db->db_blkptr = NULL; 1257*ea8dc4b6Seschrock 1258*ea8dc4b6Seschrock if (db->db_blkid != DB_BONUS_BLKID && MUTEX_HELD(&dn->dn_dbufs_mtx)) { 1259*ea8dc4b6Seschrock list_remove(&dn->dn_dbufs, db); 1260*ea8dc4b6Seschrock dnode_rele(dn, db); 1261*ea8dc4b6Seschrock } 1262*ea8dc4b6Seschrock 1263*ea8dc4b6Seschrock if (db->db_buf) 1264*ea8dc4b6Seschrock dbuf_gone = arc_buf_evict(db->db_buf); 1265*ea8dc4b6Seschrock 1266*ea8dc4b6Seschrock if (!dbuf_gone) 1267fa9e4066Sahrens mutex_exit(&db->db_mtx); 1268fa9e4066Sahrens 1269fa9e4066Sahrens /* 1270fa9e4066Sahrens * If this dbuf is referened from an indirect dbuf, 1271fa9e4066Sahrens * decrement the ref count on the indirect dbuf. 1272fa9e4066Sahrens */ 1273*ea8dc4b6Seschrock if (parent && parent != dn->dn_dbuf) 1274*ea8dc4b6Seschrock dbuf_rele(parent, db); 1275fa9e4066Sahrens } 1276fa9e4066Sahrens 1277fa9e4066Sahrens static int 1278fa9e4066Sahrens dbuf_findbp(dnode_t *dn, int level, uint64_t blkid, int fail_sparse, 1279fa9e4066Sahrens dmu_buf_impl_t **parentp, blkptr_t **bpp) 1280fa9e4066Sahrens { 1281fa9e4066Sahrens int nlevels, epbs; 1282fa9e4066Sahrens 1283*ea8dc4b6Seschrock ASSERT(blkid != DB_BONUS_BLKID); 1284*ea8dc4b6Seschrock 1285fa9e4066Sahrens if (dn->dn_phys->dn_nlevels == 0) 1286fa9e4066Sahrens nlevels = 1; 1287fa9e4066Sahrens else 1288fa9e4066Sahrens nlevels = dn->dn_phys->dn_nlevels; 1289fa9e4066Sahrens 1290fa9e4066Sahrens epbs = dn->dn_indblkshift - SPA_BLKPTRSHIFT; 1291fa9e4066Sahrens 1292fa9e4066Sahrens ASSERT3U(level * epbs, <, 64); 1293fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 1294*ea8dc4b6Seschrock if (level >= nlevels || 1295fa9e4066Sahrens (blkid > (dn->dn_phys->dn_maxblkid >> (level * epbs)))) { 1296fa9e4066Sahrens /* the buffer has no parent yet */ 1297fa9e4066Sahrens *parentp = NULL; 1298fa9e4066Sahrens *bpp = NULL; 1299fa9e4066Sahrens return (ENOENT); 1300fa9e4066Sahrens } else if (level < nlevels-1) { 1301fa9e4066Sahrens /* this block is referenced from an indirect block */ 1302fa9e4066Sahrens int err = dbuf_hold_impl(dn, level+1, 1303fa9e4066Sahrens blkid >> epbs, fail_sparse, NULL, parentp); 1304fa9e4066Sahrens if (err) 1305fa9e4066Sahrens return (err); 1306*ea8dc4b6Seschrock err = dbuf_read(*parentp, NULL, 1307*ea8dc4b6Seschrock (DB_RF_HAVESTRUCT | DB_RF_NOPREFETCH | DB_RF_CANFAIL)); 1308*ea8dc4b6Seschrock if (err == 0) { 1309fa9e4066Sahrens *bpp = ((blkptr_t *)(*parentp)->db.db_data) + 1310fa9e4066Sahrens (blkid & ((1ULL << epbs) - 1)); 1311*ea8dc4b6Seschrock } 1312*ea8dc4b6Seschrock return (err); 1313fa9e4066Sahrens } else { 1314fa9e4066Sahrens /* the block is referenced from the dnode */ 1315fa9e4066Sahrens ASSERT3U(level, ==, nlevels-1); 1316fa9e4066Sahrens ASSERT(dn->dn_phys->dn_nblkptr == 0 || 1317fa9e4066Sahrens blkid < dn->dn_phys->dn_nblkptr); 1318fa9e4066Sahrens *parentp = dn->dn_dbuf; 1319fa9e4066Sahrens *bpp = &dn->dn_phys->dn_blkptr[blkid]; 1320fa9e4066Sahrens return (0); 1321fa9e4066Sahrens } 1322fa9e4066Sahrens } 1323fa9e4066Sahrens 1324fa9e4066Sahrens static dmu_buf_impl_t * 1325fa9e4066Sahrens dbuf_create(dnode_t *dn, uint8_t level, uint64_t blkid, 1326fa9e4066Sahrens dmu_buf_impl_t *parent, blkptr_t *blkptr) 1327fa9e4066Sahrens { 1328fa9e4066Sahrens objset_impl_t *os = dn->dn_objset; 1329fa9e4066Sahrens dmu_buf_impl_t *db, *odb; 1330fa9e4066Sahrens 1331fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 1332fa9e4066Sahrens ASSERT(dn->dn_type != DMU_OT_NONE); 1333fa9e4066Sahrens 1334fa9e4066Sahrens db = kmem_cache_alloc(dbuf_cache, KM_SLEEP); 1335fa9e4066Sahrens 1336fa9e4066Sahrens db->db_objset = os; 1337fa9e4066Sahrens db->db.db_object = dn->dn_object; 1338fa9e4066Sahrens db->db_level = level; 1339fa9e4066Sahrens db->db_blkid = blkid; 1340*ea8dc4b6Seschrock db->db_dirtied = 0; 1341*ea8dc4b6Seschrock db->db_dirtycnt = 0; 1342*ea8dc4b6Seschrock db->db_dnode = dn; 1343*ea8dc4b6Seschrock db->db_parent = parent; 1344*ea8dc4b6Seschrock db->db_blkptr = blkptr; 1345fa9e4066Sahrens 1346*ea8dc4b6Seschrock bzero(&db->db_d, sizeof (db->db_d)); 1347*ea8dc4b6Seschrock 1348*ea8dc4b6Seschrock if (blkid == DB_BONUS_BLKID) { 1349*ea8dc4b6Seschrock ASSERT3P(parent, ==, dn->dn_dbuf); 1350fa9e4066Sahrens db->db.db_size = dn->dn_bonuslen; 1351fa9e4066Sahrens db->db.db_offset = DB_BONUS_BLKID; 1352*ea8dc4b6Seschrock db->db_state = DB_UNCACHED; 1353*ea8dc4b6Seschrock /* the bonus dbuf is not placed in the hash table */ 1354*ea8dc4b6Seschrock return (db); 1355fa9e4066Sahrens } else { 1356fa9e4066Sahrens int blocksize = 1357fa9e4066Sahrens db->db_level ? 1<<dn->dn_indblkshift : dn->dn_datablksz; 1358fa9e4066Sahrens db->db.db_size = blocksize; 1359fa9e4066Sahrens db->db.db_offset = db->db_blkid * blocksize; 1360fa9e4066Sahrens } 1361fa9e4066Sahrens 1362fa9e4066Sahrens /* 1363fa9e4066Sahrens * Hold the dn_dbufs_mtx while we get the new dbuf 1364fa9e4066Sahrens * in the hash table *and* added to the dbufs list. 1365fa9e4066Sahrens * This prevents a possible deadlock with someone 1366fa9e4066Sahrens * trying to look up this dbuf before its added to the 1367fa9e4066Sahrens * dn_dbufs list. 1368fa9e4066Sahrens */ 1369fa9e4066Sahrens mutex_enter(&dn->dn_dbufs_mtx); 1370*ea8dc4b6Seschrock db->db_state = DB_EVICTING; 1371fa9e4066Sahrens if ((odb = dbuf_hash_insert(db)) != NULL) { 1372fa9e4066Sahrens /* someone else inserted it first */ 1373fa9e4066Sahrens kmem_cache_free(dbuf_cache, db); 1374fa9e4066Sahrens mutex_exit(&dn->dn_dbufs_mtx); 1375fa9e4066Sahrens return (odb); 1376fa9e4066Sahrens } 1377fa9e4066Sahrens list_insert_head(&dn->dn_dbufs, db); 1378*ea8dc4b6Seschrock db->db_state = DB_UNCACHED; 1379fa9e4066Sahrens mutex_exit(&dn->dn_dbufs_mtx); 1380fa9e4066Sahrens 1381fa9e4066Sahrens if (parent && parent != dn->dn_dbuf) 1382fa9e4066Sahrens dbuf_add_ref(parent, db); 1383fa9e4066Sahrens 1384*ea8dc4b6Seschrock ASSERT(dn->dn_object == DMU_META_DNODE_OBJECT || 1385*ea8dc4b6Seschrock refcount_count(&dn->dn_holds) > 0); 1386fa9e4066Sahrens (void) refcount_add(&dn->dn_holds, db); 1387fa9e4066Sahrens 1388fa9e4066Sahrens dprintf_dbuf(db, "db=%p\n", db); 1389fa9e4066Sahrens 1390fa9e4066Sahrens return (db); 1391fa9e4066Sahrens } 1392fa9e4066Sahrens 1393fa9e4066Sahrens static int 1394*ea8dc4b6Seschrock dbuf_do_evict(void *private) 1395fa9e4066Sahrens { 1396*ea8dc4b6Seschrock arc_buf_t *buf = private; 1397*ea8dc4b6Seschrock dmu_buf_impl_t *db = buf->b_private; 1398fa9e4066Sahrens 1399*ea8dc4b6Seschrock if (!MUTEX_HELD(&db->db_mtx)) 1400*ea8dc4b6Seschrock mutex_enter(&db->db_mtx); 1401*ea8dc4b6Seschrock 1402*ea8dc4b6Seschrock ASSERT(db->db_buf == buf); 1403*ea8dc4b6Seschrock ASSERT(refcount_is_zero(&db->db_holds)); 1404*ea8dc4b6Seschrock 1405*ea8dc4b6Seschrock if (db->db_state != DB_EVICTING) { 1406*ea8dc4b6Seschrock ASSERT(db->db_state == DB_CACHED); 14079c9dc39aSek110237 DBUF_VERIFY(db); 1408*ea8dc4b6Seschrock db->db_buf = NULL; 1409*ea8dc4b6Seschrock dbuf_evict(db); 1410*ea8dc4b6Seschrock } else { 1411*ea8dc4b6Seschrock mutex_exit(&db->db_mtx); 1412*ea8dc4b6Seschrock dbuf_destroy(db); 1413fa9e4066Sahrens } 1414*ea8dc4b6Seschrock return (0); 1415fa9e4066Sahrens } 1416fa9e4066Sahrens 1417fa9e4066Sahrens static void 1418fa9e4066Sahrens dbuf_destroy(dmu_buf_impl_t *db) 1419fa9e4066Sahrens { 1420fa9e4066Sahrens ASSERT(refcount_is_zero(&db->db_holds)); 1421fa9e4066Sahrens 1422*ea8dc4b6Seschrock if (db->db_blkid != DB_BONUS_BLKID) { 1423*ea8dc4b6Seschrock dnode_t *dn = db->db_dnode; 1424*ea8dc4b6Seschrock 1425*ea8dc4b6Seschrock /* 1426*ea8dc4b6Seschrock * If this dbuf is still on the dn_dbufs list, 1427*ea8dc4b6Seschrock * remove it from that list. 1428*ea8dc4b6Seschrock */ 1429*ea8dc4b6Seschrock if (list_link_active(&db->db_link)) { 1430*ea8dc4b6Seschrock int need_mutex; 1431*ea8dc4b6Seschrock 1432*ea8dc4b6Seschrock ASSERT(!MUTEX_HELD(&dn->dn_dbufs_mtx)); 1433*ea8dc4b6Seschrock need_mutex = !MUTEX_HELD(&dn->dn_dbufs_mtx); 1434*ea8dc4b6Seschrock if (need_mutex) 1435*ea8dc4b6Seschrock mutex_enter(&dn->dn_dbufs_mtx); 1436*ea8dc4b6Seschrock 1437*ea8dc4b6Seschrock /* remove from dn_dbufs */ 1438*ea8dc4b6Seschrock list_remove(&dn->dn_dbufs, db); 1439*ea8dc4b6Seschrock 1440*ea8dc4b6Seschrock if (need_mutex) 1441*ea8dc4b6Seschrock mutex_exit(&dn->dn_dbufs_mtx); 1442*ea8dc4b6Seschrock 1443*ea8dc4b6Seschrock dnode_rele(dn, db); 1444*ea8dc4b6Seschrock } 1445*ea8dc4b6Seschrock dbuf_hash_remove(db); 1446*ea8dc4b6Seschrock } 1447*ea8dc4b6Seschrock db->db_parent = NULL; 1448*ea8dc4b6Seschrock db->db_dnode = NULL; 1449*ea8dc4b6Seschrock db->db_buf = NULL; 1450*ea8dc4b6Seschrock 1451fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 1452fa9e4066Sahrens ASSERT(db->db_hash_next == NULL); 1453fa9e4066Sahrens ASSERT(db->db_blkptr == NULL); 1454fa9e4066Sahrens ASSERT(db->db_data_pending == NULL); 1455fa9e4066Sahrens 1456fa9e4066Sahrens kmem_cache_free(dbuf_cache, db); 1457fa9e4066Sahrens } 1458fa9e4066Sahrens 1459fa9e4066Sahrens void 1460fa9e4066Sahrens dbuf_prefetch(dnode_t *dn, uint64_t blkid) 1461fa9e4066Sahrens { 1462fa9e4066Sahrens dmu_buf_impl_t *db, *parent = NULL; 1463fa9e4066Sahrens blkptr_t *bp = NULL; 1464fa9e4066Sahrens 1465fa9e4066Sahrens ASSERT(blkid != DB_BONUS_BLKID); 1466fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 1467fa9e4066Sahrens 1468fa9e4066Sahrens if (dnode_block_freed(dn, blkid)) 1469fa9e4066Sahrens return; 1470fa9e4066Sahrens 1471fa9e4066Sahrens /* dbuf_find() returns with db_mtx held */ 1472fa9e4066Sahrens if (db = dbuf_find(dn, 0, blkid)) { 1473fa9e4066Sahrens /* 1474fa9e4066Sahrens * This dbuf is already in the cache. We assume that 1475fa9e4066Sahrens * it is already CACHED, or else about to be either 1476fa9e4066Sahrens * read or filled. 1477fa9e4066Sahrens */ 1478fa9e4066Sahrens mutex_exit(&db->db_mtx); 1479fa9e4066Sahrens return; 1480fa9e4066Sahrens } 1481fa9e4066Sahrens 1482fa9e4066Sahrens if (dbuf_findbp(dn, 0, blkid, TRUE, &parent, &bp) == 0) { 1483fa9e4066Sahrens if (bp && !BP_IS_HOLE(bp)) { 1484*ea8dc4b6Seschrock zbookmark_t zb; 1485*ea8dc4b6Seschrock zb.zb_objset = dn->dn_objset->os_dsl_dataset ? 1486*ea8dc4b6Seschrock dn->dn_objset->os_dsl_dataset->ds_object : 0; 1487*ea8dc4b6Seschrock zb.zb_object = dn->dn_object; 1488*ea8dc4b6Seschrock zb.zb_level = 0; 1489*ea8dc4b6Seschrock zb.zb_blkid = blkid; 1490*ea8dc4b6Seschrock 1491fa9e4066Sahrens (void) arc_read(NULL, dn->dn_objset->os_spa, bp, 1492fa9e4066Sahrens dmu_ot[dn->dn_type].ot_byteswap, 1493fa9e4066Sahrens NULL, NULL, ZIO_PRIORITY_ASYNC_READ, 1494fa9e4066Sahrens ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE, 1495*ea8dc4b6Seschrock (ARC_NOWAIT | ARC_PREFETCH), &zb); 1496fa9e4066Sahrens } 1497fa9e4066Sahrens if (parent && parent != dn->dn_dbuf) 1498*ea8dc4b6Seschrock dbuf_rele(parent, NULL); 1499fa9e4066Sahrens } 1500fa9e4066Sahrens } 1501fa9e4066Sahrens 1502fa9e4066Sahrens /* 1503fa9e4066Sahrens * Returns with db_holds incremented, and db_mtx not held. 1504fa9e4066Sahrens * Note: dn_struct_rwlock must be held. 1505fa9e4066Sahrens */ 1506fa9e4066Sahrens int 1507fa9e4066Sahrens dbuf_hold_impl(dnode_t *dn, uint8_t level, uint64_t blkid, int fail_sparse, 1508fa9e4066Sahrens void *tag, dmu_buf_impl_t **dbp) 1509fa9e4066Sahrens { 1510fa9e4066Sahrens dmu_buf_impl_t *db, *parent = NULL; 1511fa9e4066Sahrens 1512*ea8dc4b6Seschrock ASSERT(blkid != DB_BONUS_BLKID); 1513fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 1514fa9e4066Sahrens ASSERT3U(dn->dn_nlevels, >, level); 1515fa9e4066Sahrens 1516fa9e4066Sahrens *dbp = NULL; 1517*ea8dc4b6Seschrock top: 1518fa9e4066Sahrens /* dbuf_find() returns with db_mtx held */ 1519fa9e4066Sahrens db = dbuf_find(dn, level, blkid); 1520fa9e4066Sahrens 1521fa9e4066Sahrens if (db == NULL) { 1522fa9e4066Sahrens blkptr_t *bp = NULL; 1523fa9e4066Sahrens int err; 1524fa9e4066Sahrens 1525fa9e4066Sahrens err = dbuf_findbp(dn, level, blkid, fail_sparse, &parent, &bp); 1526fa9e4066Sahrens if (fail_sparse) { 1527fa9e4066Sahrens if (err == 0 && bp && BP_IS_HOLE(bp)) 1528fa9e4066Sahrens err = ENOENT; 1529fa9e4066Sahrens if (err) { 1530fa9e4066Sahrens if (parent && parent != dn->dn_dbuf) 1531*ea8dc4b6Seschrock dbuf_rele(parent, NULL); 1532fa9e4066Sahrens return (err); 1533fa9e4066Sahrens } 1534fa9e4066Sahrens } 1535*ea8dc4b6Seschrock if (err && err != ENOENT) 1536*ea8dc4b6Seschrock return (err); 1537fa9e4066Sahrens db = dbuf_create(dn, level, blkid, parent, bp); 1538fa9e4066Sahrens } 1539fa9e4066Sahrens 1540*ea8dc4b6Seschrock if (db->db_buf && refcount_is_zero(&db->db_holds)) { 1541*ea8dc4b6Seschrock arc_buf_add_ref(db->db_buf, db); 1542*ea8dc4b6Seschrock if (db->db_buf->b_data == NULL) { 1543*ea8dc4b6Seschrock dbuf_clear(db); 1544*ea8dc4b6Seschrock goto top; 1545*ea8dc4b6Seschrock } 1546*ea8dc4b6Seschrock ASSERT3P(db->db.db_data, ==, db->db_buf->b_data); 1547*ea8dc4b6Seschrock } 1548*ea8dc4b6Seschrock 1549*ea8dc4b6Seschrock ASSERT(db->db_buf == NULL || arc_referenced(db->db_buf)); 1550*ea8dc4b6Seschrock 1551fa9e4066Sahrens /* 1552fa9e4066Sahrens * If this buffer is currently syncing out, and we are 1553fa9e4066Sahrens * are still referencing it from db_data, we need to make 1554fa9e4066Sahrens * a copy of it in case we decide we want to dirty it 1555fa9e4066Sahrens * again in this txg. 1556fa9e4066Sahrens */ 1557fa9e4066Sahrens if (db->db_level == 0 && db->db_state == DB_CACHED && 1558*ea8dc4b6Seschrock dn->dn_object != DMU_META_DNODE_OBJECT && 1559fa9e4066Sahrens db->db_data_pending == db->db_buf) { 1560fa9e4066Sahrens int size = (db->db_blkid == DB_BONUS_BLKID) ? 1561fa9e4066Sahrens DN_MAX_BONUSLEN : db->db.db_size; 1562fa9e4066Sahrens 1563fa9e4066Sahrens dbuf_set_data(db, arc_buf_alloc(db->db_dnode->dn_objset->os_spa, 1564fa9e4066Sahrens size, db)); 1565fa9e4066Sahrens bcopy(db->db_data_pending->b_data, db->db.db_data, 1566fa9e4066Sahrens db->db.db_size); 1567fa9e4066Sahrens } 1568fa9e4066Sahrens 1569*ea8dc4b6Seschrock (void) refcount_add(&db->db_holds, tag); 1570fa9e4066Sahrens dbuf_update_data(db); 15719c9dc39aSek110237 DBUF_VERIFY(db); 1572fa9e4066Sahrens mutex_exit(&db->db_mtx); 1573fa9e4066Sahrens 1574fa9e4066Sahrens /* NOTE: we can't rele the parent until after we drop the db_mtx */ 1575fa9e4066Sahrens if (parent && parent != dn->dn_dbuf) 1576*ea8dc4b6Seschrock dbuf_rele(parent, NULL); 1577fa9e4066Sahrens 1578fa9e4066Sahrens ASSERT3P(db->db_dnode, ==, dn); 1579fa9e4066Sahrens ASSERT3U(db->db_blkid, ==, blkid); 1580fa9e4066Sahrens ASSERT3U(db->db_level, ==, level); 1581fa9e4066Sahrens *dbp = db; 1582fa9e4066Sahrens 1583fa9e4066Sahrens return (0); 1584fa9e4066Sahrens } 1585fa9e4066Sahrens 1586fa9e4066Sahrens dmu_buf_impl_t * 1587*ea8dc4b6Seschrock dbuf_hold(dnode_t *dn, uint64_t blkid, void *tag) 1588fa9e4066Sahrens { 1589fa9e4066Sahrens dmu_buf_impl_t *db; 1590*ea8dc4b6Seschrock int err = dbuf_hold_impl(dn, 0, blkid, FALSE, tag, &db); 1591*ea8dc4b6Seschrock return (err ? NULL : db); 1592fa9e4066Sahrens } 1593fa9e4066Sahrens 1594fa9e4066Sahrens dmu_buf_impl_t * 1595fa9e4066Sahrens dbuf_hold_level(dnode_t *dn, int level, uint64_t blkid, void *tag) 1596fa9e4066Sahrens { 1597fa9e4066Sahrens dmu_buf_impl_t *db; 1598*ea8dc4b6Seschrock int err = dbuf_hold_impl(dn, level, blkid, FALSE, tag, &db); 1599*ea8dc4b6Seschrock return (err ? NULL : db); 1600fa9e4066Sahrens } 1601fa9e4066Sahrens 1602fa9e4066Sahrens dmu_buf_impl_t * 1603*ea8dc4b6Seschrock dbuf_create_bonus(dnode_t *dn) 1604fa9e4066Sahrens { 1605*ea8dc4b6Seschrock dmu_buf_impl_t *db = dn->dn_bonus; 1606*ea8dc4b6Seschrock 1607*ea8dc4b6Seschrock ASSERT(RW_WRITE_HELD(&dn->dn_struct_rwlock)); 1608*ea8dc4b6Seschrock 1609*ea8dc4b6Seschrock ASSERT(dn->dn_bonus == NULL); 1610*ea8dc4b6Seschrock db = dbuf_create(dn, 0, DB_BONUS_BLKID, dn->dn_dbuf, NULL); 1611fa9e4066Sahrens return (db); 1612fa9e4066Sahrens } 1613fa9e4066Sahrens 1614*ea8dc4b6Seschrock #pragma weak dmu_buf_add_ref = dbuf_add_ref 1615fa9e4066Sahrens void 1616fa9e4066Sahrens dbuf_add_ref(dmu_buf_impl_t *db, void *tag) 1617fa9e4066Sahrens { 1618*ea8dc4b6Seschrock int64_t holds = refcount_add(&db->db_holds, tag); 1619*ea8dc4b6Seschrock ASSERT(holds > 1); 1620fa9e4066Sahrens } 1621fa9e4066Sahrens 1622*ea8dc4b6Seschrock #pragma weak dmu_buf_rele = dbuf_rele 1623fa9e4066Sahrens void 1624*ea8dc4b6Seschrock dbuf_rele(dmu_buf_impl_t *db, void *tag) 1625fa9e4066Sahrens { 1626fa9e4066Sahrens int64_t holds; 1627fa9e4066Sahrens 1628fa9e4066Sahrens mutex_enter(&db->db_mtx); 16299c9dc39aSek110237 DBUF_VERIFY(db); 1630fa9e4066Sahrens 1631fa9e4066Sahrens holds = refcount_remove(&db->db_holds, tag); 1632*ea8dc4b6Seschrock ASSERT(holds >= 0); 1633fa9e4066Sahrens 1634fa9e4066Sahrens if (holds == db->db_dirtycnt && 1635fa9e4066Sahrens db->db_level == 0 && db->db_d.db_immediate_evict) 1636fa9e4066Sahrens dbuf_evict_user(db); 1637*ea8dc4b6Seschrock 1638*ea8dc4b6Seschrock if (holds == 0) { 1639*ea8dc4b6Seschrock if (db->db_blkid == DB_BONUS_BLKID) { 1640*ea8dc4b6Seschrock mutex_exit(&db->db_mtx); 1641*ea8dc4b6Seschrock dnode_rele(db->db_dnode, db); 1642*ea8dc4b6Seschrock } else if (db->db_buf == NULL) { 1643*ea8dc4b6Seschrock /* 1644*ea8dc4b6Seschrock * This is a special case: we never associated this 1645*ea8dc4b6Seschrock * dbuf with any data allocated from the ARC. 1646*ea8dc4b6Seschrock */ 1647*ea8dc4b6Seschrock ASSERT3U(db->db_state, ==, DB_UNCACHED); 1648*ea8dc4b6Seschrock dbuf_evict(db); 1649*ea8dc4b6Seschrock } else if (arc_released(db->db_buf)) { 1650*ea8dc4b6Seschrock arc_buf_t *buf = db->db_buf; 1651*ea8dc4b6Seschrock /* 1652*ea8dc4b6Seschrock * This dbuf has anonymous data associated with it. 1653*ea8dc4b6Seschrock */ 1654*ea8dc4b6Seschrock dbuf_set_data(db, NULL); 1655*ea8dc4b6Seschrock VERIFY(arc_buf_remove_ref(buf, db) == 1); 1656*ea8dc4b6Seschrock dbuf_evict(db); 1657*ea8dc4b6Seschrock } else { 1658*ea8dc4b6Seschrock VERIFY(arc_buf_remove_ref(db->db_buf, db) == 0); 1659fa9e4066Sahrens mutex_exit(&db->db_mtx); 1660fa9e4066Sahrens } 1661*ea8dc4b6Seschrock } else { 1662*ea8dc4b6Seschrock mutex_exit(&db->db_mtx); 1663fa9e4066Sahrens } 1664fa9e4066Sahrens } 1665fa9e4066Sahrens 1666fa9e4066Sahrens #pragma weak dmu_buf_refcount = dbuf_refcount 1667fa9e4066Sahrens uint64_t 1668fa9e4066Sahrens dbuf_refcount(dmu_buf_impl_t *db) 1669fa9e4066Sahrens { 1670fa9e4066Sahrens return (refcount_count(&db->db_holds)); 1671fa9e4066Sahrens } 1672fa9e4066Sahrens 1673fa9e4066Sahrens void * 1674fa9e4066Sahrens dmu_buf_set_user(dmu_buf_t *db_fake, void *user_ptr, void *user_data_ptr_ptr, 1675fa9e4066Sahrens dmu_buf_evict_func_t *evict_func) 1676fa9e4066Sahrens { 1677fa9e4066Sahrens return (dmu_buf_update_user(db_fake, NULL, user_ptr, 1678fa9e4066Sahrens user_data_ptr_ptr, evict_func)); 1679fa9e4066Sahrens } 1680fa9e4066Sahrens 1681fa9e4066Sahrens void * 1682fa9e4066Sahrens dmu_buf_set_user_ie(dmu_buf_t *db_fake, void *user_ptr, void *user_data_ptr_ptr, 1683fa9e4066Sahrens dmu_buf_evict_func_t *evict_func) 1684fa9e4066Sahrens { 1685fa9e4066Sahrens dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 1686fa9e4066Sahrens 1687fa9e4066Sahrens db->db_d.db_immediate_evict = TRUE; 1688fa9e4066Sahrens return (dmu_buf_update_user(db_fake, NULL, user_ptr, 1689fa9e4066Sahrens user_data_ptr_ptr, evict_func)); 1690fa9e4066Sahrens } 1691fa9e4066Sahrens 1692fa9e4066Sahrens void * 1693fa9e4066Sahrens dmu_buf_update_user(dmu_buf_t *db_fake, void *old_user_ptr, void *user_ptr, 1694fa9e4066Sahrens void *user_data_ptr_ptr, dmu_buf_evict_func_t *evict_func) 1695fa9e4066Sahrens { 1696fa9e4066Sahrens dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 1697fa9e4066Sahrens ASSERT(db->db_level == 0); 1698fa9e4066Sahrens 1699fa9e4066Sahrens ASSERT((user_ptr == NULL) == (evict_func == NULL)); 1700fa9e4066Sahrens 1701fa9e4066Sahrens mutex_enter(&db->db_mtx); 1702fa9e4066Sahrens 1703fa9e4066Sahrens if (db->db_d.db_user_ptr == old_user_ptr) { 1704fa9e4066Sahrens db->db_d.db_user_ptr = user_ptr; 1705fa9e4066Sahrens db->db_d.db_user_data_ptr_ptr = user_data_ptr_ptr; 1706fa9e4066Sahrens db->db_d.db_evict_func = evict_func; 1707fa9e4066Sahrens 1708fa9e4066Sahrens dbuf_update_data(db); 1709fa9e4066Sahrens } else { 1710fa9e4066Sahrens old_user_ptr = db->db_d.db_user_ptr; 1711fa9e4066Sahrens } 1712fa9e4066Sahrens 1713fa9e4066Sahrens mutex_exit(&db->db_mtx); 1714fa9e4066Sahrens return (old_user_ptr); 1715fa9e4066Sahrens } 1716fa9e4066Sahrens 1717fa9e4066Sahrens void * 1718fa9e4066Sahrens dmu_buf_get_user(dmu_buf_t *db_fake) 1719fa9e4066Sahrens { 1720fa9e4066Sahrens dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 1721fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 1722fa9e4066Sahrens 1723fa9e4066Sahrens return (db->db_d.db_user_ptr); 1724fa9e4066Sahrens } 1725fa9e4066Sahrens 1726fa9e4066Sahrens void 1727fa9e4066Sahrens dbuf_sync(dmu_buf_impl_t *db, zio_t *zio, dmu_tx_t *tx) 1728fa9e4066Sahrens { 1729fa9e4066Sahrens arc_buf_t **data; 1730fa9e4066Sahrens uint64_t txg = tx->tx_txg; 1731fa9e4066Sahrens dnode_t *dn = db->db_dnode; 1732fa9e4066Sahrens objset_impl_t *os = dn->dn_objset; 173323b11526Smaybee int epbs = dn->dn_phys->dn_indblkshift - SPA_BLKPTRSHIFT; 1734*ea8dc4b6Seschrock int checksum, compress; 1735*ea8dc4b6Seschrock zbookmark_t zb; 1736fa9e4066Sahrens int blksz; 1737fa9e4066Sahrens 1738fa9e4066Sahrens ASSERT(dmu_tx_is_syncing(tx)); 1739fa9e4066Sahrens 1740fa9e4066Sahrens dprintf_dbuf_bp(db, db->db_blkptr, "blkptr=%p", db->db_blkptr); 1741fa9e4066Sahrens 1742fa9e4066Sahrens mutex_enter(&db->db_mtx); 1743fa9e4066Sahrens /* 1744fa9e4066Sahrens * To be synced, we must be dirtied. But we 1745fa9e4066Sahrens * might have been freed after the dirty. 1746fa9e4066Sahrens */ 1747fa9e4066Sahrens if (db->db_state == DB_UNCACHED) { 1748fa9e4066Sahrens /* This buffer has been freed since it was dirtied */ 1749fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 1750fa9e4066Sahrens } else if (db->db_state == DB_FILL) { 1751fa9e4066Sahrens /* This buffer was freed and is now being re-filled */ 1752fa9e4066Sahrens ASSERT(db->db.db_data != db->db_d.db_data_old[txg&TXG_MASK]); 1753fa9e4066Sahrens } else { 1754fa9e4066Sahrens ASSERT3U(db->db_state, ==, DB_CACHED); 1755fa9e4066Sahrens } 17569c9dc39aSek110237 DBUF_VERIFY(db); 1757fa9e4066Sahrens 1758fa9e4066Sahrens /* 1759fa9e4066Sahrens * Don't need a lock on db_dirty (dn_mtx), because it can't 1760fa9e4066Sahrens * be modified yet. 1761fa9e4066Sahrens */ 1762fa9e4066Sahrens 1763*ea8dc4b6Seschrock if (db->db_blkid == DB_BONUS_BLKID) { 1764*ea8dc4b6Seschrock void **datap = &db->db_d.db_data_old[txg&TXG_MASK]; 1765*ea8dc4b6Seschrock /* 1766*ea8dc4b6Seschrock * Simply copy the bonus data into the dnode. It will 1767*ea8dc4b6Seschrock * be written out when the dnode is synced (and it will 1768*ea8dc4b6Seschrock * be synced, since it must have been dirty for dbuf_sync 1769*ea8dc4b6Seschrock * to be called). 1770*ea8dc4b6Seschrock */ 1771*ea8dc4b6Seschrock /* 1772*ea8dc4b6Seschrock * Use dn_phys->dn_bonuslen since db.db_size is the length 1773*ea8dc4b6Seschrock * of the bonus buffer in the open transaction rather than 1774*ea8dc4b6Seschrock * the syncing transaction. 1775*ea8dc4b6Seschrock */ 1776*ea8dc4b6Seschrock ASSERT(*datap != NULL); 1777*ea8dc4b6Seschrock ASSERT3U(db->db_level, ==, 0); 1778*ea8dc4b6Seschrock ASSERT3U(dn->dn_phys->dn_bonuslen, <=, DN_MAX_BONUSLEN); 1779*ea8dc4b6Seschrock bcopy(*datap, DN_BONUS(dn->dn_phys), dn->dn_phys->dn_bonuslen); 1780*ea8dc4b6Seschrock if (*datap != db->db.db_data) 1781*ea8dc4b6Seschrock zio_buf_free(*datap, DN_MAX_BONUSLEN); 1782*ea8dc4b6Seschrock db->db_d.db_data_old[txg&TXG_MASK] = NULL; 1783*ea8dc4b6Seschrock db->db_data_pending = NULL; 1784*ea8dc4b6Seschrock if (db->db_dirtied == txg) 1785*ea8dc4b6Seschrock db->db_dirtied = 0; 1786*ea8dc4b6Seschrock ASSERT(db->db_dirtycnt > 0); 1787*ea8dc4b6Seschrock db->db_dirtycnt -= 1; 1788*ea8dc4b6Seschrock mutex_exit(&db->db_mtx); 1789*ea8dc4b6Seschrock dbuf_rele(db, (void *)(uintptr_t)txg); 1790*ea8dc4b6Seschrock return; 1791*ea8dc4b6Seschrock } 1792*ea8dc4b6Seschrock 1793fa9e4066Sahrens if (db->db_level == 0) { 1794*ea8dc4b6Seschrock data = (arc_buf_t **)&db->db_d.db_data_old[txg&TXG_MASK]; 1795fa9e4066Sahrens blksz = arc_buf_size(*data); 1796fa9e4066Sahrens /* 1797fa9e4066Sahrens * If this buffer is currently "in use" (i.e., there are 1798fa9e4066Sahrens * active holds and db_data still references it), then make 1799fa9e4066Sahrens * a copy before we start the write so that any modifications 1800fa9e4066Sahrens * from the open txg will not leak into this write. 1801fa9e4066Sahrens * 1802fa9e4066Sahrens * NOTE: this copy does not need to be made for objects only 1803fa9e4066Sahrens * modified in the syncing context (e.g. DNONE_DNODE blocks) 1804fa9e4066Sahrens * or if there is no actual write involved (bonus blocks). 1805fa9e4066Sahrens */ 1806*ea8dc4b6Seschrock if (dn->dn_object != DMU_META_DNODE_OBJECT && 1807*ea8dc4b6Seschrock db->db_d.db_overridden_by[txg&TXG_MASK] == NULL) { 1808fa9e4066Sahrens if (refcount_count(&db->db_holds) > 1 && 1809fa9e4066Sahrens *data == db->db_buf) { 1810*ea8dc4b6Seschrock *data = arc_buf_alloc(os->os_spa, blksz, db); 1811fa9e4066Sahrens bcopy(db->db.db_data, (*data)->b_data, blksz); 1812fa9e4066Sahrens } 1813fa9e4066Sahrens db->db_data_pending = *data; 1814*ea8dc4b6Seschrock } else if (dn->dn_object == DMU_META_DNODE_OBJECT) { 1815fa9e4066Sahrens /* 1816fa9e4066Sahrens * Private object buffers are released here rather 1817fa9e4066Sahrens * than in dbuf_dirty() since they are only modified 1818fa9e4066Sahrens * in the syncing context and we don't want the 1819fa9e4066Sahrens * overhead of making multiple copies of the data. 1820fa9e4066Sahrens */ 1821fa9e4066Sahrens arc_release(db->db_buf, db); 1822fa9e4066Sahrens } 1823fa9e4066Sahrens } else { 1824fa9e4066Sahrens data = &db->db_buf; 1825fa9e4066Sahrens if (*data == NULL) { 1826fa9e4066Sahrens /* 1827fa9e4066Sahrens * This can happen if we dirty and then free 1828fa9e4066Sahrens * the level-0 data blocks in the same txg. So 1829fa9e4066Sahrens * this indirect remains unchanged. 1830fa9e4066Sahrens */ 1831fa9e4066Sahrens if (db->db_dirtied == txg) 1832fa9e4066Sahrens db->db_dirtied = 0; 1833fa9e4066Sahrens ASSERT(db->db_dirtycnt > 0); 1834fa9e4066Sahrens db->db_dirtycnt -= 1; 1835fa9e4066Sahrens mutex_exit(&db->db_mtx); 1836*ea8dc4b6Seschrock dbuf_rele(db, (void *)(uintptr_t)txg); 1837fa9e4066Sahrens return; 1838fa9e4066Sahrens } 1839fa9e4066Sahrens blksz = db->db.db_size; 1840fa9e4066Sahrens ASSERT3U(blksz, ==, 1<<dn->dn_phys->dn_indblkshift); 1841fa9e4066Sahrens } 1842fa9e4066Sahrens 1843fa9e4066Sahrens ASSERT(*data != NULL); 1844fa9e4066Sahrens 1845*ea8dc4b6Seschrock if (db->db_level > 0 && !arc_released(db->db_buf)) { 1846fa9e4066Sahrens /* 1847fa9e4066Sahrens * This indirect buffer was marked dirty, but 1848fa9e4066Sahrens * never modified (if it had been modified, then 1849fa9e4066Sahrens * we would have released the buffer). There is 1850fa9e4066Sahrens * no reason to write anything. 1851fa9e4066Sahrens */ 1852fa9e4066Sahrens db->db_data_pending = NULL; 1853fa9e4066Sahrens if (db->db_dirtied == txg) 1854fa9e4066Sahrens db->db_dirtied = 0; 1855fa9e4066Sahrens ASSERT(db->db_dirtycnt > 0); 1856fa9e4066Sahrens db->db_dirtycnt -= 1; 1857fa9e4066Sahrens mutex_exit(&db->db_mtx); 1858*ea8dc4b6Seschrock dbuf_rele(db, (void *)(uintptr_t)txg); 1859fa9e4066Sahrens return; 1860fa9e4066Sahrens } else if (db->db_blkptr == NULL && 1861fa9e4066Sahrens db->db_level == dn->dn_phys->dn_nlevels-1 && 1862fa9e4066Sahrens db->db_blkid < dn->dn_phys->dn_nblkptr) { 1863fa9e4066Sahrens /* 1864fa9e4066Sahrens * This buffer was allocated at a time when there was 1865fa9e4066Sahrens * no available blkptrs from the dnode, or it was 1866fa9e4066Sahrens * inappropriate to hook it in (i.e., nlevels mis-match). 1867fa9e4066Sahrens */ 1868fa9e4066Sahrens ASSERT(db->db_blkptr == NULL); 1869fa9e4066Sahrens ASSERT(db->db_parent == NULL); 1870fa9e4066Sahrens db->db_parent = dn->dn_dbuf; 1871fa9e4066Sahrens db->db_blkptr = &dn->dn_phys->dn_blkptr[db->db_blkid]; 18729c9dc39aSek110237 DBUF_VERIFY(db); 1873fa9e4066Sahrens mutex_exit(&db->db_mtx); 1874fa9e4066Sahrens } else if (db->db_blkptr == NULL) { 1875fa9e4066Sahrens dmu_buf_impl_t *parent = db->db_parent; 1876fa9e4066Sahrens 1877fa9e4066Sahrens mutex_exit(&db->db_mtx); 1878fa9e4066Sahrens ASSERT(dn->dn_phys->dn_nlevels > 1); 1879fa9e4066Sahrens if (parent == NULL) { 1880fa9e4066Sahrens rw_enter(&dn->dn_struct_rwlock, RW_READER); 1881fa9e4066Sahrens (void) dbuf_hold_impl(dn, db->db_level+1, 1882*ea8dc4b6Seschrock db->db_blkid >> epbs, FALSE, FTAG, &parent); 1883fa9e4066Sahrens rw_exit(&dn->dn_struct_rwlock); 1884fa9e4066Sahrens dbuf_add_ref(parent, db); 1885fa9e4066Sahrens db->db_parent = parent; 1886*ea8dc4b6Seschrock dbuf_rele(parent, FTAG); 1887fa9e4066Sahrens } 1888*ea8dc4b6Seschrock (void) dbuf_read(parent, NULL, DB_RF_MUST_SUCCEED); 1889fa9e4066Sahrens } else { 1890fa9e4066Sahrens mutex_exit(&db->db_mtx); 1891fa9e4066Sahrens } 1892fa9e4066Sahrens 1893*ea8dc4b6Seschrock ASSERT(dn->dn_object == DMU_META_DNODE_OBJECT || db->db_parent != NULL); 1894fa9e4066Sahrens 189523b11526Smaybee if (db->db_level > 0 && 189623b11526Smaybee db->db_blkid > dn->dn_phys->dn_maxblkid >> (db->db_level * epbs)) { 189723b11526Smaybee /* 189823b11526Smaybee * Don't write indirect blocks past EOF. 189923b11526Smaybee * We get these when we truncate a file *after* dirtying 190023b11526Smaybee * blocks in the truncate range (we undirty the level 0 190123b11526Smaybee * blocks in dbuf_free_range(), but not the indirects). 190223b11526Smaybee */ 190323b11526Smaybee #ifdef ZFS_DEBUG 190423b11526Smaybee /* 190523b11526Smaybee * Verify that this indirect block is empty. 190623b11526Smaybee */ 190723b11526Smaybee blkptr_t *bplist; 190823b11526Smaybee int i; 190923b11526Smaybee 191023b11526Smaybee mutex_enter(&db->db_mtx); 191123b11526Smaybee bplist = db->db.db_data; 191223b11526Smaybee for (i = 0; i < (1 << epbs); i++) { 191323b11526Smaybee if (!BP_IS_HOLE(&bplist[i])) { 191423b11526Smaybee panic("data past EOF: " 191534f18512Seschrock "db=%p level=%d id=%llu i=%d\n", 191634f18512Seschrock db, db->db_level, 191734f18512Seschrock (u_longlong_t)db->db_blkid, i); 191823b11526Smaybee } 191923b11526Smaybee } 192023b11526Smaybee mutex_exit(&db->db_mtx); 192123b11526Smaybee #endif 192223b11526Smaybee ASSERT(db->db_blkptr == NULL || BP_IS_HOLE(db->db_blkptr)); 192323b11526Smaybee mutex_enter(&db->db_mtx); 192423b11526Smaybee db->db_dirtycnt -= 1; 192523b11526Smaybee mutex_exit(&db->db_mtx); 1926*ea8dc4b6Seschrock dbuf_rele(db, (void *)(uintptr_t)txg); 192723b11526Smaybee return; 192823b11526Smaybee } 192923b11526Smaybee 1930fa9e4066Sahrens if (db->db_parent != dn->dn_dbuf) { 1931fa9e4066Sahrens dmu_buf_impl_t *parent = db->db_parent; 1932fa9e4066Sahrens 1933fa9e4066Sahrens mutex_enter(&db->db_mtx); 1934fa9e4066Sahrens ASSERT(db->db_level == parent->db_level-1); 1935fa9e4066Sahrens ASSERT(list_link_active(&parent->db_dirty_node[txg&TXG_MASK])); 1936fa9e4066Sahrens /* 1937*ea8dc4b6Seschrock * We may have read this indirect block after we dirtied it, 1938fa9e4066Sahrens * so never released it from the cache. 1939fa9e4066Sahrens */ 1940*ea8dc4b6Seschrock arc_release(parent->db_buf, db->db_parent); 1941fa9e4066Sahrens 1942fa9e4066Sahrens db->db_blkptr = (blkptr_t *)parent->db.db_data + 1943fa9e4066Sahrens (db->db_blkid & ((1ULL << epbs) - 1)); 19449c9dc39aSek110237 DBUF_VERIFY(db); 1945fa9e4066Sahrens mutex_exit(&db->db_mtx); 1946fa9e4066Sahrens #ifdef ZFS_DEBUG 1947*ea8dc4b6Seschrock } else { 1948fa9e4066Sahrens /* 1949fa9e4066Sahrens * We don't need to dnode_setdirty(dn) because if we got 1950fa9e4066Sahrens * here then the parent is already dirty. 1951fa9e4066Sahrens */ 1952fa9e4066Sahrens ASSERT(db->db_level == dn->dn_phys->dn_nlevels-1); 1953fa9e4066Sahrens ASSERT3P(db->db_blkptr, ==, 1954fa9e4066Sahrens &dn->dn_phys->dn_blkptr[db->db_blkid]); 1955fa9e4066Sahrens #endif 1956*ea8dc4b6Seschrock } 1957*ea8dc4b6Seschrock ASSERT(db->db_parent == NULL || arc_released(db->db_parent->db_buf)); 1958*ea8dc4b6Seschrock 1959fa9e4066Sahrens if (db->db_level == 0 && 1960fa9e4066Sahrens db->db_d.db_overridden_by[txg&TXG_MASK] != NULL) { 1961*ea8dc4b6Seschrock arc_buf_t **old = 1962*ea8dc4b6Seschrock (arc_buf_t **)&db->db_d.db_data_old[txg&TXG_MASK]; 1963fa9e4066Sahrens blkptr_t **bpp = &db->db_d.db_overridden_by[txg&TXG_MASK]; 1964fa9e4066Sahrens int old_size = BP_GET_ASIZE(db->db_blkptr); 1965fa9e4066Sahrens int new_size = BP_GET_ASIZE(*bpp); 1966fa9e4066Sahrens 1967fa9e4066Sahrens ASSERT(db->db_blkid != DB_BONUS_BLKID); 1968fa9e4066Sahrens 1969fa9e4066Sahrens dnode_diduse_space(dn, new_size-old_size); 1970fa9e4066Sahrens mutex_enter(&dn->dn_mtx); 1971fa9e4066Sahrens if (db->db_blkid > dn->dn_phys->dn_maxblkid) 1972fa9e4066Sahrens dn->dn_phys->dn_maxblkid = db->db_blkid; 1973fa9e4066Sahrens mutex_exit(&dn->dn_mtx); 1974fa9e4066Sahrens 1975fa9e4066Sahrens dsl_dataset_block_born(os->os_dsl_dataset, *bpp, tx); 1976fa9e4066Sahrens if (!BP_IS_HOLE(db->db_blkptr)) 1977fa9e4066Sahrens dsl_dataset_block_kill(os->os_dsl_dataset, 1978fa9e4066Sahrens db->db_blkptr, os->os_synctx); 1979fa9e4066Sahrens 1980fa9e4066Sahrens mutex_enter(&db->db_mtx); 1981fa9e4066Sahrens *db->db_blkptr = **bpp; 1982fa9e4066Sahrens kmem_free(*bpp, sizeof (blkptr_t)); 1983fa9e4066Sahrens *bpp = NULL; 1984fa9e4066Sahrens 1985fa9e4066Sahrens if (*old != db->db_buf) 1986*ea8dc4b6Seschrock VERIFY(arc_buf_remove_ref(*old, db) == 1); 1987*ea8dc4b6Seschrock else if (!BP_IS_HOLE(db->db_blkptr)) 1988*ea8dc4b6Seschrock arc_set_callback(db->db_buf, dbuf_do_evict, db); 1989*ea8dc4b6Seschrock else 1990*ea8dc4b6Seschrock ASSERT(arc_released(db->db_buf)); 1991fa9e4066Sahrens *old = NULL; 1992fa9e4066Sahrens db->db_data_pending = NULL; 1993fa9e4066Sahrens 1994fa9e4066Sahrens cv_broadcast(&db->db_changed); 1995fa9e4066Sahrens 1996fa9e4066Sahrens ASSERT(db->db_dirtycnt > 0); 1997fa9e4066Sahrens db->db_dirtycnt -= 1; 1998fa9e4066Sahrens mutex_exit(&db->db_mtx); 1999*ea8dc4b6Seschrock dbuf_rele(db, (void *)(uintptr_t)txg); 2000*ea8dc4b6Seschrock return; 2001*ea8dc4b6Seschrock } 2002fa9e4066Sahrens 2003fa9e4066Sahrens if (db->db_level > 0) { 2004fa9e4066Sahrens /* 2005fa9e4066Sahrens * XXX -- we should design a compression algorithm 2006fa9e4066Sahrens * that specializes in arrays of bps. 2007fa9e4066Sahrens */ 2008fa9e4066Sahrens checksum = ZIO_CHECKSUM_FLETCHER_4; 2009*ea8dc4b6Seschrock compress = ZIO_COMPRESS_LZJB; 2010fa9e4066Sahrens } else { 2011fa9e4066Sahrens /* 2012fa9e4066Sahrens * Allow dnode settings to override objset settings, 2013fa9e4066Sahrens * except for metadata checksums. 2014fa9e4066Sahrens */ 2015fa9e4066Sahrens if (dmu_ot[dn->dn_type].ot_metadata) { 2016fa9e4066Sahrens checksum = os->os_md_checksum; 2017fa9e4066Sahrens compress = zio_compress_select(dn->dn_compress, 2018fa9e4066Sahrens os->os_md_compress); 2019fa9e4066Sahrens } else { 2020fa9e4066Sahrens checksum = zio_checksum_select(dn->dn_checksum, 2021fa9e4066Sahrens os->os_checksum); 2022fa9e4066Sahrens compress = zio_compress_select(dn->dn_compress, 2023fa9e4066Sahrens os->os_compress); 2024fa9e4066Sahrens } 2025fa9e4066Sahrens } 2026fa9e4066Sahrens #ifdef ZFS_DEBUG 2027fa9e4066Sahrens if (db->db_parent) { 2028fa9e4066Sahrens ASSERT(list_link_active( 2029fa9e4066Sahrens &db->db_parent->db_dirty_node[txg&TXG_MASK])); 2030fa9e4066Sahrens ASSERT(db->db_parent == dn->dn_dbuf || 2031fa9e4066Sahrens db->db_parent->db_level > 0); 2032*ea8dc4b6Seschrock if (dn->dn_object == DMU_META_DNODE_OBJECT || db->db_level > 0) 2033fa9e4066Sahrens ASSERT(*data == db->db_buf); 2034fa9e4066Sahrens } 2035fa9e4066Sahrens #endif 2036fa9e4066Sahrens ASSERT3U(db->db_blkptr->blk_birth, <=, tx->tx_txg); 2037*ea8dc4b6Seschrock zb.zb_objset = os->os_dsl_dataset ? os->os_dsl_dataset->ds_object : 0; 2038*ea8dc4b6Seschrock zb.zb_object = db->db.db_object; 2039*ea8dc4b6Seschrock zb.zb_level = db->db_level; 2040*ea8dc4b6Seschrock zb.zb_blkid = db->db_blkid; 2041fa9e4066Sahrens (void) arc_write(zio, os->os_spa, checksum, compress, txg, 2042fa9e4066Sahrens db->db_blkptr, *data, dbuf_write_done, db, 2043*ea8dc4b6Seschrock ZIO_PRIORITY_ASYNC_WRITE, ZIO_FLAG_MUSTSUCCEED, ARC_NOWAIT, &zb); 2044fa9e4066Sahrens /* 2045fa9e4066Sahrens * We can't access db after arc_write, since it could finish 2046fa9e4066Sahrens * and be freed, and we have no locks on it. 2047fa9e4066Sahrens */ 2048fa9e4066Sahrens } 2049fa9e4066Sahrens 2050fa9e4066Sahrens struct dbuf_arg { 2051fa9e4066Sahrens objset_impl_t *os; 2052fa9e4066Sahrens blkptr_t bp; 2053fa9e4066Sahrens }; 2054fa9e4066Sahrens 2055fa9e4066Sahrens static void 2056fa9e4066Sahrens dbuf_do_born(void *arg) 2057fa9e4066Sahrens { 2058fa9e4066Sahrens struct dbuf_arg *da = arg; 2059fa9e4066Sahrens dsl_dataset_block_born(da->os->os_dsl_dataset, 2060fa9e4066Sahrens &da->bp, da->os->os_synctx); 2061fa9e4066Sahrens kmem_free(da, sizeof (struct dbuf_arg)); 2062fa9e4066Sahrens } 2063fa9e4066Sahrens 2064fa9e4066Sahrens static void 2065fa9e4066Sahrens dbuf_do_kill(void *arg) 2066fa9e4066Sahrens { 2067fa9e4066Sahrens struct dbuf_arg *da = arg; 2068fa9e4066Sahrens dsl_dataset_block_kill(da->os->os_dsl_dataset, 2069fa9e4066Sahrens &da->bp, da->os->os_synctx); 2070fa9e4066Sahrens kmem_free(da, sizeof (struct dbuf_arg)); 2071fa9e4066Sahrens } 2072fa9e4066Sahrens 2073fa9e4066Sahrens /* ARGSUSED */ 2074fa9e4066Sahrens static void 2075fa9e4066Sahrens dbuf_write_done(zio_t *zio, arc_buf_t *buf, void *vdb) 2076fa9e4066Sahrens { 2077fa9e4066Sahrens dmu_buf_impl_t *db = vdb; 2078fa9e4066Sahrens dnode_t *dn = db->db_dnode; 2079fa9e4066Sahrens objset_impl_t *os = dn->dn_objset; 2080fa9e4066Sahrens uint64_t txg = zio->io_txg; 2081fa9e4066Sahrens uint64_t fill = 0; 2082fa9e4066Sahrens int i; 2083fa9e4066Sahrens int old_size, new_size; 2084fa9e4066Sahrens 2085fa9e4066Sahrens ASSERT3U(zio->io_error, ==, 0); 2086fa9e4066Sahrens 2087fa9e4066Sahrens dprintf_dbuf_bp(db, &zio->io_bp_orig, "bp_orig: %s", ""); 2088fa9e4066Sahrens 2089fa9e4066Sahrens old_size = BP_GET_ASIZE(&zio->io_bp_orig); 2090fa9e4066Sahrens new_size = BP_GET_ASIZE(zio->io_bp); 2091fa9e4066Sahrens 2092fa9e4066Sahrens dnode_diduse_space(dn, new_size-old_size); 2093fa9e4066Sahrens 2094fa9e4066Sahrens mutex_enter(&db->db_mtx); 2095fa9e4066Sahrens 2096fa9e4066Sahrens if (db->db_dirtied == txg) 2097fa9e4066Sahrens db->db_dirtied = 0; 2098fa9e4066Sahrens 2099fa9e4066Sahrens if (db->db_level == 0) { 2100*ea8dc4b6Seschrock arc_buf_t **old = 2101*ea8dc4b6Seschrock (arc_buf_t **)&db->db_d.db_data_old[txg&TXG_MASK]; 2102fa9e4066Sahrens 2103fa9e4066Sahrens ASSERT(db->db_blkid != DB_BONUS_BLKID); 2104fa9e4066Sahrens 2105fa9e4066Sahrens if (*old != db->db_buf) 2106*ea8dc4b6Seschrock VERIFY(arc_buf_remove_ref(*old, db) == 1); 2107*ea8dc4b6Seschrock else if (!BP_IS_HOLE(db->db_blkptr)) 2108*ea8dc4b6Seschrock arc_set_callback(db->db_buf, dbuf_do_evict, db); 2109*ea8dc4b6Seschrock else 2110*ea8dc4b6Seschrock ASSERT(arc_released(db->db_buf)); 2111fa9e4066Sahrens *old = NULL; 2112fa9e4066Sahrens db->db_data_pending = NULL; 2113fa9e4066Sahrens 2114fa9e4066Sahrens mutex_enter(&dn->dn_mtx); 2115fa9e4066Sahrens if (db->db_blkid > dn->dn_phys->dn_maxblkid && 2116fa9e4066Sahrens !BP_IS_HOLE(db->db_blkptr)) 2117fa9e4066Sahrens dn->dn_phys->dn_maxblkid = db->db_blkid; 2118fa9e4066Sahrens mutex_exit(&dn->dn_mtx); 2119fa9e4066Sahrens 2120fa9e4066Sahrens if (dn->dn_type == DMU_OT_DNODE) { 2121fa9e4066Sahrens dnode_phys_t *dnp = db->db.db_data; 2122fa9e4066Sahrens for (i = db->db.db_size >> DNODE_SHIFT; i > 0; 2123fa9e4066Sahrens i--, dnp++) { 2124fa9e4066Sahrens if (dnp->dn_type != DMU_OT_NONE) 2125fa9e4066Sahrens fill++; 2126fa9e4066Sahrens } 2127fa9e4066Sahrens } else { 2128fa9e4066Sahrens if (!BP_IS_HOLE(db->db_blkptr)) 2129fa9e4066Sahrens fill = 1; 2130fa9e4066Sahrens } 2131fa9e4066Sahrens } else { 2132fa9e4066Sahrens blkptr_t *bp = db->db.db_data; 2133fa9e4066Sahrens ASSERT3U(db->db.db_size, ==, 1<<dn->dn_phys->dn_indblkshift); 2134fa9e4066Sahrens if (!BP_IS_HOLE(db->db_blkptr)) { 213523b11526Smaybee int epbs = 213623b11526Smaybee dn->dn_phys->dn_indblkshift - SPA_BLKPTRSHIFT; 2137fa9e4066Sahrens ASSERT3U(BP_GET_LSIZE(zio->io_bp), ==, db->db.db_size); 2138fa9e4066Sahrens ASSERT3U(BP_GET_LSIZE(db->db_blkptr), ==, 2139fa9e4066Sahrens db->db.db_size); 214023b11526Smaybee ASSERT3U(dn->dn_phys->dn_maxblkid 214123b11526Smaybee >> (db->db_level * epbs), >=, db->db_blkid); 2142*ea8dc4b6Seschrock arc_set_callback(db->db_buf, dbuf_do_evict, db); 2143fa9e4066Sahrens } 2144fa9e4066Sahrens for (i = db->db.db_size >> SPA_BLKPTRSHIFT; i > 0; i--, bp++) { 2145fa9e4066Sahrens if (BP_IS_HOLE(bp)) 2146fa9e4066Sahrens continue; 2147fa9e4066Sahrens ASSERT3U(BP_GET_LSIZE(bp), ==, 2148fa9e4066Sahrens db->db_level == 1 ? dn->dn_datablksz : 2149fa9e4066Sahrens (1<<dn->dn_phys->dn_indblkshift)); 2150fa9e4066Sahrens fill += bp->blk_fill; 2151fa9e4066Sahrens } 2152fa9e4066Sahrens } 2153fa9e4066Sahrens 2154fa9e4066Sahrens if (!BP_IS_HOLE(db->db_blkptr)) { 2155fa9e4066Sahrens db->db_blkptr->blk_fill = fill; 2156fa9e4066Sahrens BP_SET_TYPE(db->db_blkptr, dn->dn_type); 2157fa9e4066Sahrens BP_SET_LEVEL(db->db_blkptr, db->db_level); 2158fa9e4066Sahrens } else { 2159fa9e4066Sahrens ASSERT3U(fill, ==, 0); 2160fa9e4066Sahrens ASSERT3U(db->db_blkptr->blk_fill, ==, 0); 2161fa9e4066Sahrens } 2162fa9e4066Sahrens 2163fa9e4066Sahrens dprintf_dbuf_bp(db, db->db_blkptr, 2164fa9e4066Sahrens "wrote %llu bytes to blkptr:", zio->io_size); 2165fa9e4066Sahrens 2166fa9e4066Sahrens ASSERT(db->db_parent == NULL || 2167fa9e4066Sahrens list_link_active(&db->db_parent->db_dirty_node[txg&TXG_MASK])); 2168fa9e4066Sahrens cv_broadcast(&db->db_changed); 2169fa9e4066Sahrens ASSERT(db->db_dirtycnt > 0); 2170fa9e4066Sahrens db->db_dirtycnt -= 1; 2171fa9e4066Sahrens mutex_exit(&db->db_mtx); 2172fa9e4066Sahrens 2173fa9e4066Sahrens /* We must do this after we've set the bp's type and level */ 2174fa9e4066Sahrens if (!DVA_EQUAL(BP_IDENTITY(zio->io_bp), 2175fa9e4066Sahrens BP_IDENTITY(&zio->io_bp_orig))) { 2176fa9e4066Sahrens struct dbuf_arg *da; 2177fa9e4066Sahrens da = kmem_alloc(sizeof (struct dbuf_arg), KM_SLEEP); 2178fa9e4066Sahrens da->os = os; 2179fa9e4066Sahrens da->bp = *zio->io_bp; 2180fa9e4066Sahrens (void) taskq_dispatch(dbuf_tq, dbuf_do_born, da, 0); 2181fa9e4066Sahrens if (!BP_IS_HOLE(&zio->io_bp_orig)) { 2182fa9e4066Sahrens da = kmem_alloc(sizeof (struct dbuf_arg), KM_SLEEP); 2183fa9e4066Sahrens da->os = os; 2184fa9e4066Sahrens da->bp = zio->io_bp_orig; 2185fa9e4066Sahrens (void) taskq_dispatch(dbuf_tq, dbuf_do_kill, da, 0); 2186fa9e4066Sahrens } 2187fa9e4066Sahrens } 2188fa9e4066Sahrens 2189*ea8dc4b6Seschrock dbuf_rele(db, (void *)(uintptr_t)txg); 2190fa9e4066Sahrens } 2191