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 /* 22c717a561Smaybee * Copyright 2007 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); 42c717a561Smaybee static void dbuf_write(dbuf_dirty_record_t *dr, arc_buf_t *data, int checksum, 43c717a561Smaybee int compress, dmu_tx_t *tx); 44c717a561Smaybee static arc_done_func_t dbuf_write_ready; 45fa9e4066Sahrens static arc_done_func_t dbuf_write_done; 46fa9e4066Sahrens 47416e0cd8Sek110237 int zfs_mdcomp_disable = 0; 48416e0cd8Sek110237 49fa9e4066Sahrens /* 50fa9e4066Sahrens * Global data structures and functions for the dbuf cache. 51fa9e4066Sahrens */ 52fa9e4066Sahrens static kmem_cache_t *dbuf_cache; 53fa9e4066Sahrens 54fa9e4066Sahrens /* ARGSUSED */ 55fa9e4066Sahrens static int 56fa9e4066Sahrens dbuf_cons(void *vdb, void *unused, int kmflag) 57fa9e4066Sahrens { 58fa9e4066Sahrens dmu_buf_impl_t *db = vdb; 59fa9e4066Sahrens bzero(db, sizeof (dmu_buf_impl_t)); 60fa9e4066Sahrens 61fa9e4066Sahrens mutex_init(&db->db_mtx, NULL, MUTEX_DEFAULT, NULL); 62fa9e4066Sahrens cv_init(&db->db_changed, NULL, CV_DEFAULT, NULL); 63fa9e4066Sahrens refcount_create(&db->db_holds); 64fa9e4066Sahrens return (0); 65fa9e4066Sahrens } 66fa9e4066Sahrens 67fa9e4066Sahrens /* ARGSUSED */ 68fa9e4066Sahrens static void 69fa9e4066Sahrens dbuf_dest(void *vdb, void *unused) 70fa9e4066Sahrens { 71fa9e4066Sahrens dmu_buf_impl_t *db = vdb; 72fa9e4066Sahrens mutex_destroy(&db->db_mtx); 73fa9e4066Sahrens cv_destroy(&db->db_changed); 74fa9e4066Sahrens refcount_destroy(&db->db_holds); 75fa9e4066Sahrens } 76fa9e4066Sahrens 77fa9e4066Sahrens /* 78fa9e4066Sahrens * dbuf hash table routines 79fa9e4066Sahrens */ 80fa9e4066Sahrens static dbuf_hash_table_t dbuf_hash_table; 81fa9e4066Sahrens 82fa9e4066Sahrens static uint64_t dbuf_hash_count; 83fa9e4066Sahrens 84fa9e4066Sahrens static uint64_t 85fa9e4066Sahrens dbuf_hash(void *os, uint64_t obj, uint8_t lvl, uint64_t blkid) 86fa9e4066Sahrens { 87fa9e4066Sahrens uintptr_t osv = (uintptr_t)os; 88fa9e4066Sahrens uint64_t crc = -1ULL; 89fa9e4066Sahrens 90fa9e4066Sahrens ASSERT(zfs_crc64_table[128] == ZFS_CRC64_POLY); 91fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (lvl)) & 0xFF]; 92fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (osv >> 6)) & 0xFF]; 93fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (obj >> 0)) & 0xFF]; 94fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (obj >> 8)) & 0xFF]; 95fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (blkid >> 0)) & 0xFF]; 96fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (blkid >> 8)) & 0xFF]; 97fa9e4066Sahrens 98fa9e4066Sahrens crc ^= (osv>>14) ^ (obj>>16) ^ (blkid>>16); 99fa9e4066Sahrens 100fa9e4066Sahrens return (crc); 101fa9e4066Sahrens } 102fa9e4066Sahrens 103fa9e4066Sahrens #define DBUF_HASH(os, obj, level, blkid) dbuf_hash(os, obj, level, blkid); 104fa9e4066Sahrens 105fa9e4066Sahrens #define DBUF_EQUAL(dbuf, os, obj, level, blkid) \ 106fa9e4066Sahrens ((dbuf)->db.db_object == (obj) && \ 107fa9e4066Sahrens (dbuf)->db_objset == (os) && \ 108fa9e4066Sahrens (dbuf)->db_level == (level) && \ 109fa9e4066Sahrens (dbuf)->db_blkid == (blkid)) 110fa9e4066Sahrens 111fa9e4066Sahrens dmu_buf_impl_t * 112fa9e4066Sahrens dbuf_find(dnode_t *dn, uint8_t level, uint64_t blkid) 113fa9e4066Sahrens { 114fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 115fa9e4066Sahrens objset_impl_t *os = dn->dn_objset; 116fa9e4066Sahrens uint64_t obj = dn->dn_object; 117fa9e4066Sahrens uint64_t hv = DBUF_HASH(os, obj, level, blkid); 118fa9e4066Sahrens uint64_t idx = hv & h->hash_table_mask; 119fa9e4066Sahrens dmu_buf_impl_t *db; 120fa9e4066Sahrens 121fa9e4066Sahrens mutex_enter(DBUF_HASH_MUTEX(h, idx)); 122fa9e4066Sahrens for (db = h->hash_table[idx]; db != NULL; db = db->db_hash_next) { 123fa9e4066Sahrens if (DBUF_EQUAL(db, os, obj, level, blkid)) { 124fa9e4066Sahrens mutex_enter(&db->db_mtx); 125ea8dc4b6Seschrock if (db->db_state != DB_EVICTING) { 126fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 127fa9e4066Sahrens return (db); 128fa9e4066Sahrens } 129fa9e4066Sahrens mutex_exit(&db->db_mtx); 130fa9e4066Sahrens } 131fa9e4066Sahrens } 132fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 133fa9e4066Sahrens return (NULL); 134fa9e4066Sahrens } 135fa9e4066Sahrens 136fa9e4066Sahrens /* 137fa9e4066Sahrens * Insert an entry into the hash table. If there is already an element 138fa9e4066Sahrens * equal to elem in the hash table, then the already existing element 139fa9e4066Sahrens * will be returned and the new element will not be inserted. 140fa9e4066Sahrens * Otherwise returns NULL. 141fa9e4066Sahrens */ 142fa9e4066Sahrens static dmu_buf_impl_t * 143fa9e4066Sahrens dbuf_hash_insert(dmu_buf_impl_t *db) 144fa9e4066Sahrens { 145fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 146fa9e4066Sahrens objset_impl_t *os = db->db_objset; 147fa9e4066Sahrens uint64_t obj = db->db.db_object; 148fa9e4066Sahrens int level = db->db_level; 149fa9e4066Sahrens uint64_t blkid = db->db_blkid; 150fa9e4066Sahrens uint64_t hv = DBUF_HASH(os, obj, level, blkid); 151fa9e4066Sahrens uint64_t idx = hv & h->hash_table_mask; 152fa9e4066Sahrens dmu_buf_impl_t *dbf; 153fa9e4066Sahrens 154fa9e4066Sahrens mutex_enter(DBUF_HASH_MUTEX(h, idx)); 155fa9e4066Sahrens for (dbf = h->hash_table[idx]; dbf != NULL; dbf = dbf->db_hash_next) { 156fa9e4066Sahrens if (DBUF_EQUAL(dbf, os, obj, level, blkid)) { 157fa9e4066Sahrens mutex_enter(&dbf->db_mtx); 158ea8dc4b6Seschrock if (dbf->db_state != DB_EVICTING) { 159fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 160fa9e4066Sahrens return (dbf); 161fa9e4066Sahrens } 162fa9e4066Sahrens mutex_exit(&dbf->db_mtx); 163fa9e4066Sahrens } 164fa9e4066Sahrens } 165fa9e4066Sahrens 166fa9e4066Sahrens mutex_enter(&db->db_mtx); 167fa9e4066Sahrens db->db_hash_next = h->hash_table[idx]; 168fa9e4066Sahrens h->hash_table[idx] = db; 169fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 170fa9e4066Sahrens atomic_add_64(&dbuf_hash_count, 1); 171fa9e4066Sahrens 172fa9e4066Sahrens return (NULL); 173fa9e4066Sahrens } 174fa9e4066Sahrens 175fa9e4066Sahrens /* 176fa9e4066Sahrens * Remove an entry from the hash table. This operation will 177fa9e4066Sahrens * fail if there are any existing holds on the db. 178fa9e4066Sahrens */ 179fa9e4066Sahrens static void 180fa9e4066Sahrens dbuf_hash_remove(dmu_buf_impl_t *db) 181fa9e4066Sahrens { 182fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 183fa9e4066Sahrens uint64_t hv = DBUF_HASH(db->db_objset, db->db.db_object, 184fa9e4066Sahrens db->db_level, db->db_blkid); 185fa9e4066Sahrens uint64_t idx = hv & h->hash_table_mask; 186fa9e4066Sahrens dmu_buf_impl_t *dbf, **dbp; 187fa9e4066Sahrens 188fa9e4066Sahrens /* 189fa9e4066Sahrens * We musn't hold db_mtx to maintin lock ordering: 190fa9e4066Sahrens * DBUF_HASH_MUTEX > db_mtx. 191fa9e4066Sahrens */ 192fa9e4066Sahrens ASSERT(refcount_is_zero(&db->db_holds)); 193ea8dc4b6Seschrock ASSERT(db->db_state == DB_EVICTING); 194fa9e4066Sahrens ASSERT(!MUTEX_HELD(&db->db_mtx)); 195fa9e4066Sahrens 196fa9e4066Sahrens mutex_enter(DBUF_HASH_MUTEX(h, idx)); 197fa9e4066Sahrens dbp = &h->hash_table[idx]; 198fa9e4066Sahrens while ((dbf = *dbp) != db) { 199fa9e4066Sahrens dbp = &dbf->db_hash_next; 200fa9e4066Sahrens ASSERT(dbf != NULL); 201fa9e4066Sahrens } 202fa9e4066Sahrens *dbp = db->db_hash_next; 203fa9e4066Sahrens db->db_hash_next = NULL; 204fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 205fa9e4066Sahrens atomic_add_64(&dbuf_hash_count, -1); 206fa9e4066Sahrens } 207fa9e4066Sahrens 208ea8dc4b6Seschrock static arc_evict_func_t dbuf_do_evict; 209fa9e4066Sahrens 210fa9e4066Sahrens static void 211fa9e4066Sahrens dbuf_evict_user(dmu_buf_impl_t *db) 212fa9e4066Sahrens { 213fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 214fa9e4066Sahrens 215c717a561Smaybee if (db->db_level != 0 || db->db_evict_func == NULL) 216fa9e4066Sahrens return; 217fa9e4066Sahrens 218c717a561Smaybee if (db->db_user_data_ptr_ptr) 219c717a561Smaybee *db->db_user_data_ptr_ptr = db->db.db_data; 220c717a561Smaybee db->db_evict_func(&db->db, db->db_user_ptr); 221c717a561Smaybee db->db_user_ptr = NULL; 222c717a561Smaybee db->db_user_data_ptr_ptr = NULL; 223c717a561Smaybee db->db_evict_func = NULL; 224fa9e4066Sahrens } 225fa9e4066Sahrens 226fa9e4066Sahrens void 227ea8dc4b6Seschrock dbuf_evict(dmu_buf_impl_t *db) 228ea8dc4b6Seschrock { 229ea8dc4b6Seschrock ASSERT(MUTEX_HELD(&db->db_mtx)); 230ea8dc4b6Seschrock ASSERT(db->db_buf == NULL); 231c717a561Smaybee ASSERT(db->db_data_pending == NULL); 232ea8dc4b6Seschrock 233ea8dc4b6Seschrock dbuf_clear(db); 234ea8dc4b6Seschrock dbuf_destroy(db); 235ea8dc4b6Seschrock } 236ea8dc4b6Seschrock 237ea8dc4b6Seschrock void 238fa9e4066Sahrens dbuf_init(void) 239fa9e4066Sahrens { 240ea8dc4b6Seschrock uint64_t hsize = 1ULL << 16; 241fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 242fa9e4066Sahrens int i; 243fa9e4066Sahrens 244fa9e4066Sahrens /* 245fa9e4066Sahrens * The hash table is big enough to fill all of physical memory 246ea8dc4b6Seschrock * with an average 4K block size. The table will take up 247ea8dc4b6Seschrock * totalmem*sizeof(void*)/4K (i.e. 2MB/GB with 8-byte pointers). 248fa9e4066Sahrens */ 249ea8dc4b6Seschrock while (hsize * 4096 < physmem * PAGESIZE) 250fa9e4066Sahrens hsize <<= 1; 251fa9e4066Sahrens 252ea8dc4b6Seschrock retry: 253fa9e4066Sahrens h->hash_table_mask = hsize - 1; 254ea8dc4b6Seschrock h->hash_table = kmem_zalloc(hsize * sizeof (void *), KM_NOSLEEP); 255ea8dc4b6Seschrock if (h->hash_table == NULL) { 256ea8dc4b6Seschrock /* XXX - we should really return an error instead of assert */ 257ea8dc4b6Seschrock ASSERT(hsize > (1ULL << 10)); 258ea8dc4b6Seschrock hsize >>= 1; 259ea8dc4b6Seschrock goto retry; 260ea8dc4b6Seschrock } 261fa9e4066Sahrens 262fa9e4066Sahrens dbuf_cache = kmem_cache_create("dmu_buf_impl_t", 263fa9e4066Sahrens sizeof (dmu_buf_impl_t), 264fa9e4066Sahrens 0, dbuf_cons, dbuf_dest, NULL, NULL, NULL, 0); 265fa9e4066Sahrens 266fa9e4066Sahrens for (i = 0; i < DBUF_MUTEXES; i++) 267fa9e4066Sahrens mutex_init(&h->hash_mutexes[i], NULL, MUTEX_DEFAULT, NULL); 268fa9e4066Sahrens } 269fa9e4066Sahrens 270fa9e4066Sahrens void 271fa9e4066Sahrens dbuf_fini(void) 272fa9e4066Sahrens { 273fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 274fa9e4066Sahrens int i; 275fa9e4066Sahrens 276fa9e4066Sahrens for (i = 0; i < DBUF_MUTEXES; i++) 277fa9e4066Sahrens mutex_destroy(&h->hash_mutexes[i]); 278fa9e4066Sahrens kmem_free(h->hash_table, (h->hash_table_mask + 1) * sizeof (void *)); 279fa9e4066Sahrens kmem_cache_destroy(dbuf_cache); 280fa9e4066Sahrens } 281fa9e4066Sahrens 282fa9e4066Sahrens /* 283fa9e4066Sahrens * Other stuff. 284fa9e4066Sahrens */ 285fa9e4066Sahrens 2869c9dc39aSek110237 #ifdef ZFS_DEBUG 287fa9e4066Sahrens static void 288fa9e4066Sahrens dbuf_verify(dmu_buf_impl_t *db) 289fa9e4066Sahrens { 290fa9e4066Sahrens dnode_t *dn = db->db_dnode; 291fa9e4066Sahrens 292fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 293fa9e4066Sahrens 294fa9e4066Sahrens if (!(zfs_flags & ZFS_DEBUG_DBUF_VERIFY)) 295fa9e4066Sahrens return; 296fa9e4066Sahrens 297fa9e4066Sahrens ASSERT(db->db_objset != NULL); 298fa9e4066Sahrens if (dn == NULL) { 299fa9e4066Sahrens ASSERT(db->db_parent == NULL); 300fa9e4066Sahrens ASSERT(db->db_blkptr == NULL); 301fa9e4066Sahrens } else { 302fa9e4066Sahrens ASSERT3U(db->db.db_object, ==, dn->dn_object); 303fa9e4066Sahrens ASSERT3P(db->db_objset, ==, dn->dn_objset); 304fa9e4066Sahrens ASSERT3U(db->db_level, <, dn->dn_nlevels); 305ea8dc4b6Seschrock ASSERT(db->db_blkid == DB_BONUS_BLKID || 306ea8dc4b6Seschrock list_head(&dn->dn_dbufs)); 307fa9e4066Sahrens } 308fa9e4066Sahrens if (db->db_blkid == DB_BONUS_BLKID) { 309fa9e4066Sahrens ASSERT(dn != NULL); 310*1934e92fSmaybee ASSERT3U(db->db.db_size, >=, dn->dn_bonuslen); 311fa9e4066Sahrens ASSERT3U(db->db.db_offset, ==, DB_BONUS_BLKID); 312fa9e4066Sahrens } else { 313fa9e4066Sahrens ASSERT3U(db->db.db_offset, ==, db->db_blkid * db->db.db_size); 314fa9e4066Sahrens } 315fa9e4066Sahrens 316fa9e4066Sahrens if (db->db_level == 0) { 317fa9e4066Sahrens /* we can be momentarily larger in dnode_set_blksz() */ 318fa9e4066Sahrens if (db->db_blkid != DB_BONUS_BLKID && dn) { 319fa9e4066Sahrens ASSERT3U(db->db.db_size, >=, dn->dn_datablksz); 320fa9e4066Sahrens } 321ea8dc4b6Seschrock if (db->db.db_object == DMU_META_DNODE_OBJECT) { 322c717a561Smaybee dbuf_dirty_record_t *dr = db->db_data_pending; 323fa9e4066Sahrens /* 324fa9e4066Sahrens * it should only be modified in syncing 325fa9e4066Sahrens * context, so make sure we only have 326fa9e4066Sahrens * one copy of the data. 327fa9e4066Sahrens */ 328c717a561Smaybee ASSERT(dr == NULL || dr->dt.dl.dr_data == db->db_buf); 329fa9e4066Sahrens } 330fa9e4066Sahrens } 331fa9e4066Sahrens 332fa9e4066Sahrens /* verify db->db_blkptr */ 333fa9e4066Sahrens if (db->db_blkptr) { 334fa9e4066Sahrens if (db->db_parent == dn->dn_dbuf) { 335fa9e4066Sahrens /* db is pointed to by the dnode */ 336fa9e4066Sahrens /* ASSERT3U(db->db_blkid, <, dn->dn_nblkptr); */ 337ea8dc4b6Seschrock if (db->db.db_object == DMU_META_DNODE_OBJECT) 338fa9e4066Sahrens ASSERT(db->db_parent == NULL); 339fa9e4066Sahrens else 340fa9e4066Sahrens ASSERT(db->db_parent != NULL); 341fa9e4066Sahrens ASSERT3P(db->db_blkptr, ==, 342fa9e4066Sahrens &dn->dn_phys->dn_blkptr[db->db_blkid]); 343fa9e4066Sahrens } else { 344fa9e4066Sahrens /* db is pointed to by an indirect block */ 345fa9e4066Sahrens int epb = db->db_parent->db.db_size >> SPA_BLKPTRSHIFT; 346fa9e4066Sahrens ASSERT3U(db->db_parent->db_level, ==, db->db_level+1); 347fa9e4066Sahrens ASSERT3U(db->db_parent->db.db_object, ==, 348fa9e4066Sahrens db->db.db_object); 349fa9e4066Sahrens /* 350fa9e4066Sahrens * dnode_grow_indblksz() can make this fail if we don't 351fa9e4066Sahrens * have the struct_rwlock. XXX indblksz no longer 352fa9e4066Sahrens * grows. safe to do this now? 353fa9e4066Sahrens */ 354fa9e4066Sahrens if (RW_WRITE_HELD(&db->db_dnode->dn_struct_rwlock)) { 355fa9e4066Sahrens ASSERT3P(db->db_blkptr, ==, 356fa9e4066Sahrens ((blkptr_t *)db->db_parent->db.db_data + 357fa9e4066Sahrens db->db_blkid % epb)); 358fa9e4066Sahrens } 359fa9e4066Sahrens } 360fa9e4066Sahrens } 361fa9e4066Sahrens if ((db->db_blkptr == NULL || BP_IS_HOLE(db->db_blkptr)) && 362fa9e4066Sahrens db->db.db_data && db->db_blkid != DB_BONUS_BLKID && 363fa9e4066Sahrens db->db_state != DB_FILL && !dn->dn_free_txg) { 364fa9e4066Sahrens /* 365fa9e4066Sahrens * If the blkptr isn't set but they have nonzero data, 366fa9e4066Sahrens * it had better be dirty, otherwise we'll lose that 367fa9e4066Sahrens * data when we evict this buffer. 368fa9e4066Sahrens */ 369fa9e4066Sahrens if (db->db_dirtycnt == 0) { 370fa9e4066Sahrens uint64_t *buf = db->db.db_data; 371fa9e4066Sahrens int i; 372fa9e4066Sahrens 373fa9e4066Sahrens for (i = 0; i < db->db.db_size >> 3; i++) { 374fa9e4066Sahrens ASSERT(buf[i] == 0); 375fa9e4066Sahrens } 376fa9e4066Sahrens } 377fa9e4066Sahrens } 378fa9e4066Sahrens } 3799c9dc39aSek110237 #endif 380fa9e4066Sahrens 381fa9e4066Sahrens static void 382fa9e4066Sahrens dbuf_update_data(dmu_buf_impl_t *db) 383fa9e4066Sahrens { 384fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 385c717a561Smaybee if (db->db_level == 0 && db->db_user_data_ptr_ptr) { 386fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 387c717a561Smaybee *db->db_user_data_ptr_ptr = db->db.db_data; 388fa9e4066Sahrens } 389fa9e4066Sahrens } 390fa9e4066Sahrens 391fa9e4066Sahrens static void 392fa9e4066Sahrens dbuf_set_data(dmu_buf_impl_t *db, arc_buf_t *buf) 393fa9e4066Sahrens { 394fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 395ea8dc4b6Seschrock ASSERT(db->db_buf == NULL || !arc_has_callback(db->db_buf)); 396fa9e4066Sahrens db->db_buf = buf; 397ea8dc4b6Seschrock if (buf != NULL) { 398ea8dc4b6Seschrock ASSERT(buf->b_data != NULL); 399fa9e4066Sahrens db->db.db_data = buf->b_data; 400ea8dc4b6Seschrock if (!arc_released(buf)) 401ea8dc4b6Seschrock arc_set_callback(buf, dbuf_do_evict, db); 402fa9e4066Sahrens dbuf_update_data(db); 403ea8dc4b6Seschrock } else { 404ea8dc4b6Seschrock dbuf_evict_user(db); 405ea8dc4b6Seschrock db->db.db_data = NULL; 406ea8dc4b6Seschrock db->db_state = DB_UNCACHED; 407ea8dc4b6Seschrock } 408fa9e4066Sahrens } 409fa9e4066Sahrens 410fa9e4066Sahrens uint64_t 411fa9e4066Sahrens dbuf_whichblock(dnode_t *dn, uint64_t offset) 412fa9e4066Sahrens { 413fa9e4066Sahrens if (dn->dn_datablkshift) { 414fa9e4066Sahrens return (offset >> dn->dn_datablkshift); 415fa9e4066Sahrens } else { 416fa9e4066Sahrens ASSERT3U(offset, <, dn->dn_datablksz); 417fa9e4066Sahrens return (0); 418fa9e4066Sahrens } 419fa9e4066Sahrens } 420fa9e4066Sahrens 421fa9e4066Sahrens static void 422fa9e4066Sahrens dbuf_read_done(zio_t *zio, arc_buf_t *buf, void *vdb) 423fa9e4066Sahrens { 424fa9e4066Sahrens dmu_buf_impl_t *db = vdb; 425fa9e4066Sahrens 426fa9e4066Sahrens mutex_enter(&db->db_mtx); 427fa9e4066Sahrens ASSERT3U(db->db_state, ==, DB_READ); 428fa9e4066Sahrens /* 429fa9e4066Sahrens * All reads are synchronous, so we must have a hold on the dbuf 430fa9e4066Sahrens */ 431fa9e4066Sahrens ASSERT(refcount_count(&db->db_holds) > 0); 432ea8dc4b6Seschrock ASSERT(db->db_buf == NULL); 433fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 434c717a561Smaybee if (db->db_level == 0 && db->db_freed_in_flight) { 435fa9e4066Sahrens /* we were freed in flight; disregard any error */ 436fa9e4066Sahrens arc_release(buf, db); 437fa9e4066Sahrens bzero(buf->b_data, db->db.db_size); 4386b4acc8bSahrens arc_buf_freeze(buf); 439c717a561Smaybee db->db_freed_in_flight = FALSE; 440fa9e4066Sahrens dbuf_set_data(db, buf); 441fa9e4066Sahrens db->db_state = DB_CACHED; 442fa9e4066Sahrens } else if (zio == NULL || zio->io_error == 0) { 443fa9e4066Sahrens dbuf_set_data(db, buf); 444fa9e4066Sahrens db->db_state = DB_CACHED; 445fa9e4066Sahrens } else { 446fa9e4066Sahrens ASSERT(db->db_blkid != DB_BONUS_BLKID); 447fa9e4066Sahrens ASSERT3P(db->db_buf, ==, NULL); 448ea8dc4b6Seschrock VERIFY(arc_buf_remove_ref(buf, db) == 1); 449ea8dc4b6Seschrock db->db_state = DB_UNCACHED; 450fa9e4066Sahrens } 451fa9e4066Sahrens cv_broadcast(&db->db_changed); 452fa9e4066Sahrens mutex_exit(&db->db_mtx); 453ea8dc4b6Seschrock dbuf_rele(db, NULL); 454fa9e4066Sahrens } 455fa9e4066Sahrens 456ea8dc4b6Seschrock static void 45713506d1eSmaybee dbuf_read_impl(dmu_buf_impl_t *db, zio_t *zio, uint32_t *flags) 458fa9e4066Sahrens { 459fa9e4066Sahrens blkptr_t *bp; 460ea8dc4b6Seschrock zbookmark_t zb; 46113506d1eSmaybee uint32_t aflags = ARC_NOWAIT; 462fa9e4066Sahrens 463fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 464fa9e4066Sahrens /* We need the struct_rwlock to prevent db_blkptr from changing. */ 465fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&db->db_dnode->dn_struct_rwlock)); 466ea8dc4b6Seschrock ASSERT(MUTEX_HELD(&db->db_mtx)); 467ea8dc4b6Seschrock ASSERT(db->db_state == DB_UNCACHED); 468ea8dc4b6Seschrock ASSERT(db->db_buf == NULL); 469fa9e4066Sahrens 470fa9e4066Sahrens if (db->db_blkid == DB_BONUS_BLKID) { 471*1934e92fSmaybee int bonuslen = db->db_dnode->dn_bonuslen; 472*1934e92fSmaybee 473*1934e92fSmaybee ASSERT3U(bonuslen, <=, db->db.db_size); 474ea8dc4b6Seschrock db->db.db_data = zio_buf_alloc(DN_MAX_BONUSLEN); 47525c2057bSmaybee arc_space_consume(DN_MAX_BONUSLEN); 476*1934e92fSmaybee if (bonuslen < DN_MAX_BONUSLEN) 477ea8dc4b6Seschrock bzero(db->db.db_data, DN_MAX_BONUSLEN); 478ea8dc4b6Seschrock bcopy(DN_BONUS(db->db_dnode->dn_phys), db->db.db_data, 479*1934e92fSmaybee bonuslen); 480ea8dc4b6Seschrock dbuf_update_data(db); 481fa9e4066Sahrens db->db_state = DB_CACHED; 482fa9e4066Sahrens mutex_exit(&db->db_mtx); 483fa9e4066Sahrens return; 484fa9e4066Sahrens } 485fa9e4066Sahrens 486fa9e4066Sahrens if (db->db_level == 0 && dnode_block_freed(db->db_dnode, db->db_blkid)) 487fa9e4066Sahrens bp = NULL; 488fa9e4066Sahrens else 489fa9e4066Sahrens bp = db->db_blkptr; 490fa9e4066Sahrens 491fa9e4066Sahrens if (bp == NULL) 492fa9e4066Sahrens dprintf_dbuf(db, "blkptr: %s\n", "NULL"); 493fa9e4066Sahrens else 494fa9e4066Sahrens dprintf_dbuf_bp(db, bp, "%s", "blkptr:"); 495fa9e4066Sahrens 496fa9e4066Sahrens if (bp == NULL || BP_IS_HOLE(bp)) { 497ad23a2dbSjohansen arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 498ad23a2dbSjohansen 499fa9e4066Sahrens ASSERT(bp == NULL || BP_IS_HOLE(bp)); 500fa9e4066Sahrens dbuf_set_data(db, arc_buf_alloc(db->db_dnode->dn_objset->os_spa, 501ad23a2dbSjohansen db->db.db_size, db, type)); 502fa9e4066Sahrens bzero(db->db.db_data, db->db.db_size); 503fa9e4066Sahrens db->db_state = DB_CACHED; 50413506d1eSmaybee *flags |= DB_RF_CACHED; 505fa9e4066Sahrens mutex_exit(&db->db_mtx); 506fa9e4066Sahrens return; 507fa9e4066Sahrens } 508fa9e4066Sahrens 509fa9e4066Sahrens db->db_state = DB_READ; 510fa9e4066Sahrens mutex_exit(&db->db_mtx); 511fa9e4066Sahrens 512ea8dc4b6Seschrock zb.zb_objset = db->db_objset->os_dsl_dataset ? 513ea8dc4b6Seschrock db->db_objset->os_dsl_dataset->ds_object : 0; 514ea8dc4b6Seschrock zb.zb_object = db->db.db_object; 515ea8dc4b6Seschrock zb.zb_level = db->db_level; 516ea8dc4b6Seschrock zb.zb_blkid = db->db_blkid; 517ea8dc4b6Seschrock 518ea8dc4b6Seschrock dbuf_add_ref(db, NULL); 519fa9e4066Sahrens /* ZIO_FLAG_CANFAIL callers have to check the parent zio's error */ 52087bd5c1eSahrens ASSERT3U(db->db_dnode->dn_type, <, DMU_OT_NUMTYPES); 521fa9e4066Sahrens (void) arc_read(zio, db->db_dnode->dn_objset->os_spa, bp, 522fa9e4066Sahrens db->db_level > 0 ? byteswap_uint64_array : 523fa9e4066Sahrens dmu_ot[db->db_dnode->dn_type].ot_byteswap, 524fa9e4066Sahrens dbuf_read_done, db, ZIO_PRIORITY_SYNC_READ, 52513506d1eSmaybee (*flags & DB_RF_CANFAIL) ? ZIO_FLAG_CANFAIL : ZIO_FLAG_MUSTSUCCEED, 52613506d1eSmaybee &aflags, &zb); 52713506d1eSmaybee if (aflags & ARC_CACHED) 52813506d1eSmaybee *flags |= DB_RF_CACHED; 529fa9e4066Sahrens } 530fa9e4066Sahrens 531ea8dc4b6Seschrock int 532ea8dc4b6Seschrock dbuf_read(dmu_buf_impl_t *db, zio_t *zio, uint32_t flags) 533fa9e4066Sahrens { 534ea8dc4b6Seschrock int err = 0; 535ea8dc4b6Seschrock int havepzio = (zio != NULL); 53613506d1eSmaybee int prefetch; 537fa9e4066Sahrens 538fa9e4066Sahrens /* 539fa9e4066Sahrens * We don't have to hold the mutex to check db_state because it 540fa9e4066Sahrens * can't be freed while we have a hold on the buffer. 541fa9e4066Sahrens */ 542fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 543fa9e4066Sahrens 544fa9e4066Sahrens if ((flags & DB_RF_HAVESTRUCT) == 0) 545fa9e4066Sahrens rw_enter(&db->db_dnode->dn_struct_rwlock, RW_READER); 546fa9e4066Sahrens 54713506d1eSmaybee prefetch = db->db_level == 0 && db->db_blkid != DB_BONUS_BLKID && 54813506d1eSmaybee (flags & DB_RF_NOPREFETCH) == 0 && db->db_dnode != NULL; 54913506d1eSmaybee 550fa9e4066Sahrens mutex_enter(&db->db_mtx); 551ea8dc4b6Seschrock if (db->db_state == DB_CACHED) { 552ea8dc4b6Seschrock mutex_exit(&db->db_mtx); 55313506d1eSmaybee if (prefetch) 55413506d1eSmaybee dmu_zfetch(&db->db_dnode->dn_zfetch, db->db.db_offset, 55513506d1eSmaybee db->db.db_size, TRUE); 556ea8dc4b6Seschrock if ((flags & DB_RF_HAVESTRUCT) == 0) 557ea8dc4b6Seschrock rw_exit(&db->db_dnode->dn_struct_rwlock); 558ea8dc4b6Seschrock } else if (db->db_state == DB_UNCACHED) { 559ea8dc4b6Seschrock if (zio == NULL) { 560ea8dc4b6Seschrock zio = zio_root(db->db_dnode->dn_objset->os_spa, 561ea8dc4b6Seschrock NULL, NULL, ZIO_FLAG_CANFAIL); 562ea8dc4b6Seschrock } 56313506d1eSmaybee dbuf_read_impl(db, zio, &flags); 56413506d1eSmaybee 565ea8dc4b6Seschrock /* dbuf_read_impl has dropped db_mtx for us */ 566ea8dc4b6Seschrock 56713506d1eSmaybee if (prefetch) 568ea8dc4b6Seschrock dmu_zfetch(&db->db_dnode->dn_zfetch, db->db.db_offset, 56913506d1eSmaybee db->db.db_size, flags & DB_RF_CACHED); 570ea8dc4b6Seschrock 571ea8dc4b6Seschrock if ((flags & DB_RF_HAVESTRUCT) == 0) 572ea8dc4b6Seschrock rw_exit(&db->db_dnode->dn_struct_rwlock); 573ea8dc4b6Seschrock 574ea8dc4b6Seschrock if (!havepzio) 575ea8dc4b6Seschrock err = zio_wait(zio); 576ea8dc4b6Seschrock } else { 57713506d1eSmaybee mutex_exit(&db->db_mtx); 57813506d1eSmaybee if (prefetch) 57913506d1eSmaybee dmu_zfetch(&db->db_dnode->dn_zfetch, db->db.db_offset, 58013506d1eSmaybee db->db.db_size, TRUE); 581ea8dc4b6Seschrock if ((flags & DB_RF_HAVESTRUCT) == 0) 582ea8dc4b6Seschrock rw_exit(&db->db_dnode->dn_struct_rwlock); 58313506d1eSmaybee 58413506d1eSmaybee mutex_enter(&db->db_mtx); 585ea8dc4b6Seschrock if ((flags & DB_RF_NEVERWAIT) == 0) { 586ea8dc4b6Seschrock while (db->db_state == DB_READ || 587ea8dc4b6Seschrock db->db_state == DB_FILL) { 588fa9e4066Sahrens ASSERT(db->db_state == DB_READ || 589fa9e4066Sahrens (flags & DB_RF_HAVESTRUCT) == 0); 590fa9e4066Sahrens cv_wait(&db->db_changed, &db->db_mtx); 591fa9e4066Sahrens } 592ea8dc4b6Seschrock if (db->db_state == DB_UNCACHED) 593ea8dc4b6Seschrock err = EIO; 594ea8dc4b6Seschrock } 595fa9e4066Sahrens mutex_exit(&db->db_mtx); 596fa9e4066Sahrens } 597fa9e4066Sahrens 598ea8dc4b6Seschrock ASSERT(err || havepzio || db->db_state == DB_CACHED); 599ea8dc4b6Seschrock return (err); 600fa9e4066Sahrens } 601fa9e4066Sahrens 602fa9e4066Sahrens static void 603fa9e4066Sahrens dbuf_noread(dmu_buf_impl_t *db) 604fa9e4066Sahrens { 605fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 606ea8dc4b6Seschrock ASSERT(db->db_blkid != DB_BONUS_BLKID); 607fa9e4066Sahrens mutex_enter(&db->db_mtx); 608fa9e4066Sahrens while (db->db_state == DB_READ || db->db_state == DB_FILL) 609fa9e4066Sahrens cv_wait(&db->db_changed, &db->db_mtx); 610fa9e4066Sahrens if (db->db_state == DB_UNCACHED) { 611ad23a2dbSjohansen arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 612ad23a2dbSjohansen 613ea8dc4b6Seschrock ASSERT(db->db_buf == NULL); 614fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 615fa9e4066Sahrens dbuf_set_data(db, arc_buf_alloc(db->db_dnode->dn_objset->os_spa, 616ad23a2dbSjohansen db->db.db_size, db, type)); 617fa9e4066Sahrens db->db_state = DB_FILL; 618fa9e4066Sahrens } else { 619fa9e4066Sahrens ASSERT3U(db->db_state, ==, DB_CACHED); 620fa9e4066Sahrens } 621fa9e4066Sahrens mutex_exit(&db->db_mtx); 622fa9e4066Sahrens } 623fa9e4066Sahrens 624fa9e4066Sahrens /* 625fa9e4066Sahrens * This is our just-in-time copy function. It makes a copy of 626fa9e4066Sahrens * buffers, that have been modified in a previous transaction 627fa9e4066Sahrens * group, before we modify them in the current active group. 628fa9e4066Sahrens * 629fa9e4066Sahrens * This function is used in two places: when we are dirtying a 630fa9e4066Sahrens * buffer for the first time in a txg, and when we are freeing 631fa9e4066Sahrens * a range in a dnode that includes this buffer. 632fa9e4066Sahrens * 633fa9e4066Sahrens * Note that when we are called from dbuf_free_range() we do 634fa9e4066Sahrens * not put a hold on the buffer, we just traverse the active 635fa9e4066Sahrens * dbuf list for the dnode. 636fa9e4066Sahrens */ 637fa9e4066Sahrens static void 638fa9e4066Sahrens dbuf_fix_old_data(dmu_buf_impl_t *db, uint64_t txg) 639fa9e4066Sahrens { 640c717a561Smaybee dbuf_dirty_record_t *dr = db->db_last_dirty; 641fa9e4066Sahrens 642fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 643fa9e4066Sahrens ASSERT(db->db.db_data != NULL); 644c717a561Smaybee ASSERT(db->db_level == 0); 645c717a561Smaybee ASSERT(db->db.db_object != DMU_META_DNODE_OBJECT); 646fa9e4066Sahrens 6474d31c452Smaybee if (dr == NULL || 6484d31c452Smaybee (dr->dt.dl.dr_data != 6494d31c452Smaybee ((db->db_blkid == DB_BONUS_BLKID) ? db->db.db_data : db->db_buf))) 650fa9e4066Sahrens return; 651fa9e4066Sahrens 652fa9e4066Sahrens /* 653c717a561Smaybee * If the last dirty record for this dbuf has not yet synced 654c717a561Smaybee * and its referencing the dbuf data, either: 655c717a561Smaybee * reset the reference to point to a new copy, 656c717a561Smaybee * or (if there a no active holders) 657c717a561Smaybee * just null out the current db_data pointer. 658fa9e4066Sahrens */ 659c717a561Smaybee ASSERT(dr->dr_txg >= txg - 2); 660c717a561Smaybee if (db->db_blkid == DB_BONUS_BLKID) { 661c717a561Smaybee /* Note that the data bufs here are zio_bufs */ 662c717a561Smaybee dr->dt.dl.dr_data = zio_buf_alloc(DN_MAX_BONUSLEN); 6630e8c6158Smaybee arc_space_consume(DN_MAX_BONUSLEN); 664c717a561Smaybee bcopy(db->db.db_data, dr->dt.dl.dr_data, DN_MAX_BONUSLEN); 665c717a561Smaybee } else if (refcount_count(&db->db_holds) > db->db_dirtycnt) { 666ea8dc4b6Seschrock int size = db->db.db_size; 667c717a561Smaybee arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 668c717a561Smaybee dr->dt.dl.dr_data = arc_buf_alloc( 669ad23a2dbSjohansen db->db_dnode->dn_objset->os_spa, size, db, type); 670c717a561Smaybee bcopy(db->db.db_data, dr->dt.dl.dr_data->b_data, size); 671fa9e4066Sahrens } else { 672ea8dc4b6Seschrock dbuf_set_data(db, NULL); 673fa9e4066Sahrens } 674fa9e4066Sahrens } 675ea8dc4b6Seschrock 676fa9e4066Sahrens void 677c717a561Smaybee dbuf_unoverride(dbuf_dirty_record_t *dr) 678fa9e4066Sahrens { 679c717a561Smaybee dmu_buf_impl_t *db = dr->dr_dbuf; 680c717a561Smaybee uint64_t txg = dr->dr_txg; 681c5c6ffa0Smaybee 682c717a561Smaybee ASSERT(MUTEX_HELD(&db->db_mtx)); 683c717a561Smaybee ASSERT(dr->dt.dl.dr_override_state != DR_IN_DMU_SYNC); 684c717a561Smaybee ASSERT(db->db_level == 0); 685c717a561Smaybee 686c717a561Smaybee if (db->db_blkid == DB_BONUS_BLKID || 687c717a561Smaybee dr->dt.dl.dr_override_state == DR_NOT_OVERRIDDEN) 688c717a561Smaybee return; 689c717a561Smaybee 690fa9e4066Sahrens /* free this block */ 691c717a561Smaybee if (!BP_IS_HOLE(&dr->dt.dl.dr_overridden_by)) { 692fa9e4066Sahrens /* XXX can get silent EIO here */ 693fa9e4066Sahrens (void) arc_free(NULL, db->db_dnode->dn_objset->os_spa, 694c717a561Smaybee txg, &dr->dt.dl.dr_overridden_by, NULL, NULL, ARC_WAIT); 695fa9e4066Sahrens } 696c717a561Smaybee dr->dt.dl.dr_override_state = DR_NOT_OVERRIDDEN; 6976b4acc8bSahrens /* 6986b4acc8bSahrens * Release the already-written buffer, so we leave it in 6996b4acc8bSahrens * a consistent dirty state. Note that all callers are 7006b4acc8bSahrens * modifying the buffer, so they will immediately do 7016b4acc8bSahrens * another (redundant) arc_release(). Therefore, leave 7026b4acc8bSahrens * the buf thawed to save the effort of freezing & 7036b4acc8bSahrens * immediately re-thawing it. 7046b4acc8bSahrens */ 705c717a561Smaybee arc_release(dr->dt.dl.dr_data, db); 706fa9e4066Sahrens } 707fa9e4066Sahrens 708fa9e4066Sahrens void 709fa9e4066Sahrens dbuf_free_range(dnode_t *dn, uint64_t blkid, uint64_t nblks, dmu_tx_t *tx) 710fa9e4066Sahrens { 711fa9e4066Sahrens dmu_buf_impl_t *db, *db_next; 712fa9e4066Sahrens uint64_t txg = tx->tx_txg; 713fa9e4066Sahrens 714fa9e4066Sahrens dprintf_dnode(dn, "blkid=%llu nblks=%llu\n", blkid, nblks); 715fa9e4066Sahrens mutex_enter(&dn->dn_dbufs_mtx); 716fa9e4066Sahrens for (db = list_head(&dn->dn_dbufs); db; db = db_next) { 717fa9e4066Sahrens db_next = list_next(&dn->dn_dbufs, db); 718ea8dc4b6Seschrock ASSERT(db->db_blkid != DB_BONUS_BLKID); 719ea8dc4b6Seschrock if (db->db_level != 0) 720fa9e4066Sahrens continue; 721fa9e4066Sahrens dprintf_dbuf(db, "found buf %s\n", ""); 722fa9e4066Sahrens if (db->db_blkid < blkid || 723fa9e4066Sahrens db->db_blkid >= blkid+nblks) 724fa9e4066Sahrens continue; 725fa9e4066Sahrens 726fa9e4066Sahrens /* found a level 0 buffer in the range */ 727fa9e4066Sahrens if (dbuf_undirty(db, tx)) 728fa9e4066Sahrens continue; 729fa9e4066Sahrens 730fa9e4066Sahrens mutex_enter(&db->db_mtx); 731ea8dc4b6Seschrock if (db->db_state == DB_UNCACHED || 732ea8dc4b6Seschrock db->db_state == DB_EVICTING) { 733fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 734fa9e4066Sahrens mutex_exit(&db->db_mtx); 735fa9e4066Sahrens continue; 736fa9e4066Sahrens } 737c543ec06Sahrens if (db->db_state == DB_READ || db->db_state == DB_FILL) { 738c543ec06Sahrens /* will be handled in dbuf_read_done or dbuf_rele */ 739c717a561Smaybee db->db_freed_in_flight = TRUE; 740fa9e4066Sahrens mutex_exit(&db->db_mtx); 741fa9e4066Sahrens continue; 742fa9e4066Sahrens } 743ea8dc4b6Seschrock if (refcount_count(&db->db_holds) == 0) { 744ea8dc4b6Seschrock ASSERT(db->db_buf); 745ea8dc4b6Seschrock dbuf_clear(db); 746ea8dc4b6Seschrock continue; 747ea8dc4b6Seschrock } 748c717a561Smaybee /* The dbuf is referenced */ 749fa9e4066Sahrens 750c717a561Smaybee if (db->db_last_dirty != NULL) { 751c717a561Smaybee dbuf_dirty_record_t *dr = db->db_last_dirty; 752c717a561Smaybee 753c717a561Smaybee if (dr->dr_txg == txg) { 754ea8dc4b6Seschrock /* 755c717a561Smaybee * This buffer is "in-use", re-adjust the file 756c717a561Smaybee * size to reflect that this buffer may 757c717a561Smaybee * contain new data when we sync. 758ea8dc4b6Seschrock */ 75944eda4d7Smaybee if (db->db_blkid > dn->dn_maxblkid) 76044eda4d7Smaybee dn->dn_maxblkid = db->db_blkid; 761c717a561Smaybee dbuf_unoverride(dr); 762c717a561Smaybee } else { 763c717a561Smaybee /* 764c717a561Smaybee * This dbuf is not dirty in the open context. 765c717a561Smaybee * Either uncache it (if its not referenced in 766c717a561Smaybee * the open context) or reset its contents to 767c717a561Smaybee * empty. 768c717a561Smaybee */ 769c717a561Smaybee dbuf_fix_old_data(db, txg); 77044eda4d7Smaybee } 771c717a561Smaybee } 772c717a561Smaybee /* clear the contents if its cached */ 773ea8dc4b6Seschrock if (db->db_state == DB_CACHED) { 774ea8dc4b6Seschrock ASSERT(db->db.db_data != NULL); 775fa9e4066Sahrens arc_release(db->db_buf, db); 776fa9e4066Sahrens bzero(db->db.db_data, db->db.db_size); 7776b4acc8bSahrens arc_buf_freeze(db->db_buf); 778fa9e4066Sahrens } 779ea8dc4b6Seschrock 780fa9e4066Sahrens mutex_exit(&db->db_mtx); 781fa9e4066Sahrens } 782fa9e4066Sahrens mutex_exit(&dn->dn_dbufs_mtx); 783fa9e4066Sahrens } 784fa9e4066Sahrens 785fa9e4066Sahrens static int 786*1934e92fSmaybee dbuf_block_freeable(dmu_buf_impl_t *db) 787fa9e4066Sahrens { 788fa9e4066Sahrens dsl_dataset_t *ds = db->db_objset->os_dsl_dataset; 789fa9e4066Sahrens uint64_t birth_txg = 0; 790fa9e4066Sahrens 791fa9e4066Sahrens /* 792fa9e4066Sahrens * We don't need any locking to protect db_blkptr: 793c717a561Smaybee * If it's syncing, then db_last_dirty will be set 794c717a561Smaybee * so we'll ignore db_blkptr. 795fa9e4066Sahrens */ 796c717a561Smaybee ASSERT(MUTEX_HELD(&db->db_mtx)); 797c717a561Smaybee if (db->db_last_dirty) 798c717a561Smaybee birth_txg = db->db_last_dirty->dr_txg; 799fa9e4066Sahrens else if (db->db_blkptr) 800fa9e4066Sahrens birth_txg = db->db_blkptr->blk_birth; 801fa9e4066Sahrens 802*1934e92fSmaybee /* If we don't exist or are in a snapshot, we can't be freed */ 803fa9e4066Sahrens if (birth_txg) 804*1934e92fSmaybee return (ds == NULL || 805*1934e92fSmaybee dsl_dataset_block_freeable(ds, birth_txg)); 806fa9e4066Sahrens else 807*1934e92fSmaybee return (FALSE); 808fa9e4066Sahrens } 809fa9e4066Sahrens 810fa9e4066Sahrens void 811fa9e4066Sahrens dbuf_new_size(dmu_buf_impl_t *db, int size, dmu_tx_t *tx) 812fa9e4066Sahrens { 813fa9e4066Sahrens arc_buf_t *buf, *obuf; 814fa9e4066Sahrens int osize = db->db.db_size; 815ad23a2dbSjohansen arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 816fa9e4066Sahrens 817ea8dc4b6Seschrock ASSERT(db->db_blkid != DB_BONUS_BLKID); 818ea8dc4b6Seschrock 819fa9e4066Sahrens /* XXX does *this* func really need the lock? */ 820fa9e4066Sahrens ASSERT(RW_WRITE_HELD(&db->db_dnode->dn_struct_rwlock)); 821fa9e4066Sahrens 822fa9e4066Sahrens /* 823fa9e4066Sahrens * This call to dbuf_will_dirty() with the dn_struct_rwlock held 824fa9e4066Sahrens * is OK, because there can be no other references to the db 825fa9e4066Sahrens * when we are changing its size, so no concurrent DB_FILL can 826fa9e4066Sahrens * be happening. 827fa9e4066Sahrens */ 828ea8dc4b6Seschrock /* 829ea8dc4b6Seschrock * XXX we should be doing a dbuf_read, checking the return 830ea8dc4b6Seschrock * value and returning that up to our callers 831ea8dc4b6Seschrock */ 832fa9e4066Sahrens dbuf_will_dirty(db, tx); 833fa9e4066Sahrens 834fa9e4066Sahrens /* create the data buffer for the new block */ 835ad23a2dbSjohansen buf = arc_buf_alloc(db->db_dnode->dn_objset->os_spa, size, db, type); 836fa9e4066Sahrens 837fa9e4066Sahrens /* copy old block data to the new block */ 838fa9e4066Sahrens obuf = db->db_buf; 839f65e61c0Sahrens bcopy(obuf->b_data, buf->b_data, MIN(osize, size)); 840fa9e4066Sahrens /* zero the remainder */ 841f65e61c0Sahrens if (size > osize) 842fa9e4066Sahrens bzero((uint8_t *)buf->b_data + osize, size - osize); 843fa9e4066Sahrens 844fa9e4066Sahrens mutex_enter(&db->db_mtx); 845fa9e4066Sahrens dbuf_set_data(db, buf); 846ea8dc4b6Seschrock VERIFY(arc_buf_remove_ref(obuf, db) == 1); 847fa9e4066Sahrens db->db.db_size = size; 848fa9e4066Sahrens 849c717a561Smaybee if (db->db_level == 0) { 850c717a561Smaybee ASSERT3U(db->db_last_dirty->dr_txg, ==, tx->tx_txg); 851c717a561Smaybee db->db_last_dirty->dt.dl.dr_data = buf; 852c717a561Smaybee } 853fa9e4066Sahrens mutex_exit(&db->db_mtx); 854fa9e4066Sahrens 855fa9e4066Sahrens dnode_willuse_space(db->db_dnode, size-osize, tx); 856fa9e4066Sahrens } 857fa9e4066Sahrens 858c717a561Smaybee dbuf_dirty_record_t * 859fa9e4066Sahrens dbuf_dirty(dmu_buf_impl_t *db, dmu_tx_t *tx) 860fa9e4066Sahrens { 861fa9e4066Sahrens dnode_t *dn = db->db_dnode; 862fa9e4066Sahrens objset_impl_t *os = dn->dn_objset; 863c717a561Smaybee dbuf_dirty_record_t **drp, *dr; 864fa9e4066Sahrens int drop_struct_lock = FALSE; 865fa9e4066Sahrens int txgoff = tx->tx_txg & TXG_MASK; 866fa9e4066Sahrens 867fa9e4066Sahrens ASSERT(tx->tx_txg != 0); 868fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 8699c9dc39aSek110237 DMU_TX_DIRTY_BUF(tx, db); 870fa9e4066Sahrens 871fa9e4066Sahrens /* 872fa9e4066Sahrens * Shouldn't dirty a regular buffer in syncing context. Private 873fa9e4066Sahrens * objects may be dirtied in syncing context, but only if they 874fa9e4066Sahrens * were already pre-dirtied in open context. 875fa9e4066Sahrens * XXX We may want to prohibit dirtying in syncing context even 876fa9e4066Sahrens * if they did pre-dirty. 877fa9e4066Sahrens */ 878c717a561Smaybee ASSERT(!dmu_tx_is_syncing(tx) || 879c717a561Smaybee BP_IS_HOLE(dn->dn_objset->os_rootbp) || 880c717a561Smaybee dn->dn_object == DMU_META_DNODE_OBJECT || 881c717a561Smaybee dn->dn_objset->os_dsl_dataset == NULL || 882c717a561Smaybee dsl_dir_is_private(dn->dn_objset->os_dsl_dataset->ds_dir)); 883fa9e4066Sahrens 884fa9e4066Sahrens /* 885fa9e4066Sahrens * We make this assert for private objects as well, but after we 886fa9e4066Sahrens * check if we're already dirty. They are allowed to re-dirty 887fa9e4066Sahrens * in syncing context. 888fa9e4066Sahrens */ 889ea8dc4b6Seschrock ASSERT(dn->dn_object == DMU_META_DNODE_OBJECT || 890c717a561Smaybee dn->dn_dirtyctx == DN_UNDIRTIED || dn->dn_dirtyctx == 891fa9e4066Sahrens (dmu_tx_is_syncing(tx) ? DN_DIRTY_SYNC : DN_DIRTY_OPEN)); 892fa9e4066Sahrens 893fa9e4066Sahrens mutex_enter(&db->db_mtx); 894fa9e4066Sahrens /* 895c717a561Smaybee * XXX make this true for indirects too? The problem is that 896c717a561Smaybee * transactions created with dmu_tx_create_assigned() from 897c717a561Smaybee * syncing context don't bother holding ahead. 898fa9e4066Sahrens */ 899c717a561Smaybee ASSERT(db->db_level != 0 || 900c717a561Smaybee db->db_state == DB_CACHED || db->db_state == DB_FILL); 901fa9e4066Sahrens 902fa9e4066Sahrens mutex_enter(&dn->dn_mtx); 903fa9e4066Sahrens /* 904fa9e4066Sahrens * Don't set dirtyctx to SYNC if we're just modifying this as we 905fa9e4066Sahrens * initialize the objset. 906fa9e4066Sahrens */ 907fa9e4066Sahrens if (dn->dn_dirtyctx == DN_UNDIRTIED && 908c717a561Smaybee !BP_IS_HOLE(dn->dn_objset->os_rootbp)) { 909fa9e4066Sahrens dn->dn_dirtyctx = 910fa9e4066Sahrens (dmu_tx_is_syncing(tx) ? DN_DIRTY_SYNC : DN_DIRTY_OPEN); 911fa9e4066Sahrens ASSERT(dn->dn_dirtyctx_firstset == NULL); 912fa9e4066Sahrens dn->dn_dirtyctx_firstset = kmem_alloc(1, KM_SLEEP); 913fa9e4066Sahrens } 914fa9e4066Sahrens mutex_exit(&dn->dn_mtx); 915fa9e4066Sahrens 916fa9e4066Sahrens /* 917fa9e4066Sahrens * If this buffer is already dirty, we're done. 918fa9e4066Sahrens */ 919c717a561Smaybee drp = &db->db_last_dirty; 920c717a561Smaybee ASSERT(*drp == NULL || (*drp)->dr_txg <= tx->tx_txg || 921c717a561Smaybee db->db.db_object == DMU_META_DNODE_OBJECT); 922c717a561Smaybee while (*drp && (*drp)->dr_txg > tx->tx_txg) 923c717a561Smaybee drp = &(*drp)->dr_next; 924c717a561Smaybee if (*drp && (*drp)->dr_txg == tx->tx_txg) { 925c717a561Smaybee if (db->db_level == 0 && db->db_blkid != DB_BONUS_BLKID) { 926c717a561Smaybee /* 927c717a561Smaybee * If this buffer has already been written out, 928c717a561Smaybee * we now need to reset its state. 929c717a561Smaybee */ 930c717a561Smaybee dbuf_unoverride(*drp); 931c717a561Smaybee if (db->db.db_object != DMU_META_DNODE_OBJECT) 9326b4acc8bSahrens arc_buf_thaw(db->db_buf); 933c717a561Smaybee } 934fa9e4066Sahrens mutex_exit(&db->db_mtx); 935c717a561Smaybee return (*drp); 936fa9e4066Sahrens } 937fa9e4066Sahrens 938fa9e4066Sahrens /* 939fa9e4066Sahrens * Only valid if not already dirty. 940fa9e4066Sahrens */ 941fa9e4066Sahrens ASSERT(dn->dn_dirtyctx == DN_UNDIRTIED || dn->dn_dirtyctx == 942fa9e4066Sahrens (dmu_tx_is_syncing(tx) ? DN_DIRTY_SYNC : DN_DIRTY_OPEN)); 943fa9e4066Sahrens 944fa9e4066Sahrens ASSERT3U(dn->dn_nlevels, >, db->db_level); 945fa9e4066Sahrens ASSERT((dn->dn_phys->dn_nlevels == 0 && db->db_level == 0) || 946fa9e4066Sahrens dn->dn_phys->dn_nlevels > db->db_level || 947fa9e4066Sahrens dn->dn_next_nlevels[txgoff] > db->db_level || 948fa9e4066Sahrens dn->dn_next_nlevels[(tx->tx_txg-1) & TXG_MASK] > db->db_level || 949fa9e4066Sahrens dn->dn_next_nlevels[(tx->tx_txg-2) & TXG_MASK] > db->db_level); 950fa9e4066Sahrens 951fa9e4066Sahrens /* 952fa9e4066Sahrens * We should only be dirtying in syncing context if it's the 953fa9e4066Sahrens * mos, a spa os, or we're initializing the os. However, we are 954fa9e4066Sahrens * allowed to dirty in syncing context provided we already 955fa9e4066Sahrens * dirtied it in open context. Hence we must make this 956fa9e4066Sahrens * assertion only if we're not already dirty. 957fa9e4066Sahrens */ 958fa9e4066Sahrens ASSERT(!dmu_tx_is_syncing(tx) || 959fa9e4066Sahrens os->os_dsl_dataset == NULL || 960fa9e4066Sahrens !dsl_dir_is_private(os->os_dsl_dataset->ds_dir) || 961c717a561Smaybee !BP_IS_HOLE(os->os_rootbp)); 962fa9e4066Sahrens ASSERT(db->db.db_size != 0); 963fa9e4066Sahrens 964fa9e4066Sahrens dprintf_dbuf(db, "size=%llx\n", (u_longlong_t)db->db.db_size); 965fa9e4066Sahrens 966*1934e92fSmaybee if (db->db_blkid != DB_BONUS_BLKID) { 967*1934e92fSmaybee /* 968*1934e92fSmaybee * Update the accounting. 969*1934e92fSmaybee */ 970*1934e92fSmaybee if (dbuf_block_freeable(db)) { 971*1934e92fSmaybee blkptr_t *bp = db->db_blkptr; 972*1934e92fSmaybee int64_t willfree = (bp && !BP_IS_HOLE(bp)) ? 973*1934e92fSmaybee bp_get_dasize(os->os_spa, bp) : db->db.db_size; 974*1934e92fSmaybee /* 975*1934e92fSmaybee * This is only a guess -- if the dbuf is dirty 976*1934e92fSmaybee * in a previous txg, we don't know how much 977*1934e92fSmaybee * space it will use on disk yet. We should 978*1934e92fSmaybee * really have the struct_rwlock to access 979*1934e92fSmaybee * db_blkptr, but since this is just a guess, 980*1934e92fSmaybee * it's OK if we get an odd answer. 981*1934e92fSmaybee */ 982*1934e92fSmaybee dnode_willuse_space(dn, -willfree, tx); 983*1934e92fSmaybee } 984*1934e92fSmaybee dnode_willuse_space(dn, db->db.db_size, tx); 985*1934e92fSmaybee } 986*1934e92fSmaybee 987ea8dc4b6Seschrock /* 988ea8dc4b6Seschrock * If this buffer is dirty in an old transaction group we need 989ea8dc4b6Seschrock * to make a copy of it so that the changes we make in this 990ea8dc4b6Seschrock * transaction group won't leak out when we sync the older txg. 991ea8dc4b6Seschrock */ 992c717a561Smaybee dr = kmem_zalloc(sizeof (dbuf_dirty_record_t), KM_SLEEP); 993c717a561Smaybee if (db->db_level == 0) { 994c717a561Smaybee void *data_old = db->db_buf; 995c717a561Smaybee 996ea8dc4b6Seschrock if (db->db_blkid == DB_BONUS_BLKID) { 997c717a561Smaybee dbuf_fix_old_data(db, tx->tx_txg); 998c717a561Smaybee data_old = db->db.db_data; 999c717a561Smaybee } else if (db->db.db_object != DMU_META_DNODE_OBJECT) { 1000fa9e4066Sahrens /* 1001fa9e4066Sahrens * Release the data buffer from the cache so that we 1002fa9e4066Sahrens * can modify it without impacting possible other users 1003c717a561Smaybee * of this cached data block. Note that indirect 1004c717a561Smaybee * blocks and private objects are not released until the 1005c717a561Smaybee * syncing state (since they are only modified then). 1006fa9e4066Sahrens */ 1007fa9e4066Sahrens arc_release(db->db_buf, db); 1008fa9e4066Sahrens dbuf_fix_old_data(db, tx->tx_txg); 1009c717a561Smaybee data_old = db->db_buf; 1010fa9e4066Sahrens } 1011c717a561Smaybee ASSERT(data_old != NULL); 1012c717a561Smaybee dr->dt.dl.dr_data = data_old; 1013c717a561Smaybee } else { 1014c717a561Smaybee mutex_init(&dr->dt.di.dr_mtx, NULL, MUTEX_DEFAULT, NULL); 1015c717a561Smaybee list_create(&dr->dt.di.dr_children, 1016c717a561Smaybee sizeof (dbuf_dirty_record_t), 1017c717a561Smaybee offsetof(dbuf_dirty_record_t, dr_dirty_node)); 1018fa9e4066Sahrens } 1019c717a561Smaybee dr->dr_dbuf = db; 1020c717a561Smaybee dr->dr_txg = tx->tx_txg; 1021c717a561Smaybee dr->dr_next = *drp; 1022c717a561Smaybee *drp = dr; 1023fa9e4066Sahrens 1024fa9e4066Sahrens /* 1025fa9e4066Sahrens * We could have been freed_in_flight between the dbuf_noread 1026fa9e4066Sahrens * and dbuf_dirty. We win, as though the dbuf_noread() had 1027fa9e4066Sahrens * happened after the free. 1028fa9e4066Sahrens */ 1029fa9e4066Sahrens if (db->db_level == 0 && db->db_blkid != DB_BONUS_BLKID) { 1030c717a561Smaybee mutex_enter(&dn->dn_mtx); 1031fa9e4066Sahrens dnode_clear_range(dn, db->db_blkid, 1, tx); 1032fa9e4066Sahrens mutex_exit(&dn->dn_mtx); 1033c717a561Smaybee db->db_freed_in_flight = FALSE; 1034c717a561Smaybee } 1035fa9e4066Sahrens 1036fa9e4066Sahrens /* 1037fa9e4066Sahrens * This buffer is now part of this txg 1038fa9e4066Sahrens */ 1039fa9e4066Sahrens dbuf_add_ref(db, (void *)(uintptr_t)tx->tx_txg); 1040fa9e4066Sahrens db->db_dirtycnt += 1; 1041fa9e4066Sahrens ASSERT3U(db->db_dirtycnt, <=, 3); 1042fa9e4066Sahrens 1043fa9e4066Sahrens mutex_exit(&db->db_mtx); 1044fa9e4066Sahrens 1045fa9e4066Sahrens if (db->db_blkid == DB_BONUS_BLKID) { 1046c717a561Smaybee mutex_enter(&dn->dn_mtx); 1047c717a561Smaybee ASSERT(!list_link_active(&dr->dr_dirty_node)); 1048c717a561Smaybee list_insert_tail(&dn->dn_dirty_records[txgoff], dr); 1049c717a561Smaybee mutex_exit(&dn->dn_mtx); 1050fa9e4066Sahrens dnode_setdirty(dn, tx); 1051c717a561Smaybee return (dr); 1052fa9e4066Sahrens } 1053fa9e4066Sahrens 105444eda4d7Smaybee if (db->db_level == 0) { 1055fa9e4066Sahrens dnode_new_blkid(dn, db->db_blkid, tx); 105644eda4d7Smaybee ASSERT(dn->dn_maxblkid >= db->db_blkid); 105744eda4d7Smaybee } 1058fa9e4066Sahrens 1059fa9e4066Sahrens if (!RW_WRITE_HELD(&dn->dn_struct_rwlock)) { 1060fa9e4066Sahrens rw_enter(&dn->dn_struct_rwlock, RW_READER); 1061fa9e4066Sahrens drop_struct_lock = TRUE; 1062fa9e4066Sahrens } 1063fa9e4066Sahrens 106444eda4d7Smaybee if (db->db_level+1 < dn->dn_nlevels) { 1065c717a561Smaybee dmu_buf_impl_t *parent = db->db_parent; 1066c717a561Smaybee dbuf_dirty_record_t *di; 1067c717a561Smaybee int parent_held = FALSE; 1068c717a561Smaybee 1069c717a561Smaybee if (db->db_parent == NULL || db->db_parent == dn->dn_dbuf) { 1070fa9e4066Sahrens int epbs = dn->dn_indblkshift - SPA_BLKPTRSHIFT; 1071c717a561Smaybee 1072fa9e4066Sahrens parent = dbuf_hold_level(dn, db->db_level+1, 1073fa9e4066Sahrens db->db_blkid >> epbs, FTAG); 1074c717a561Smaybee parent_held = TRUE; 1075c717a561Smaybee } 1076fa9e4066Sahrens if (drop_struct_lock) 1077fa9e4066Sahrens rw_exit(&dn->dn_struct_rwlock); 1078c717a561Smaybee ASSERT3U(db->db_level+1, ==, parent->db_level); 1079c717a561Smaybee di = dbuf_dirty(parent, tx); 1080c717a561Smaybee if (parent_held) 1081ea8dc4b6Seschrock dbuf_rele(parent, FTAG); 1082c717a561Smaybee 1083c717a561Smaybee mutex_enter(&db->db_mtx); 1084c717a561Smaybee /* possible race with dbuf_undirty() */ 1085c717a561Smaybee if (db->db_last_dirty == dr || 1086c717a561Smaybee dn->dn_object == DMU_META_DNODE_OBJECT) { 1087c717a561Smaybee mutex_enter(&di->dt.di.dr_mtx); 1088c717a561Smaybee ASSERT3U(di->dr_txg, ==, tx->tx_txg); 1089c717a561Smaybee ASSERT(!list_link_active(&dr->dr_dirty_node)); 1090c717a561Smaybee list_insert_tail(&di->dt.di.dr_children, dr); 1091c717a561Smaybee mutex_exit(&di->dt.di.dr_mtx); 1092c717a561Smaybee dr->dr_parent = di; 1093c717a561Smaybee } 1094c717a561Smaybee mutex_exit(&db->db_mtx); 1095fa9e4066Sahrens } else { 1096c717a561Smaybee ASSERT(db->db_level+1 == dn->dn_nlevels); 1097c717a561Smaybee ASSERT(db->db_blkid < dn->dn_nblkptr); 1098c717a561Smaybee ASSERT(db->db_parent == NULL || 1099c717a561Smaybee db->db_parent == db->db_dnode->dn_dbuf); 1100c717a561Smaybee mutex_enter(&dn->dn_mtx); 1101c717a561Smaybee ASSERT(!list_link_active(&dr->dr_dirty_node)); 1102c717a561Smaybee list_insert_tail(&dn->dn_dirty_records[txgoff], dr); 1103c717a561Smaybee mutex_exit(&dn->dn_mtx); 1104fa9e4066Sahrens if (drop_struct_lock) 1105fa9e4066Sahrens rw_exit(&dn->dn_struct_rwlock); 1106fa9e4066Sahrens } 1107fa9e4066Sahrens 1108fa9e4066Sahrens dnode_setdirty(dn, tx); 1109c717a561Smaybee return (dr); 1110fa9e4066Sahrens } 1111fa9e4066Sahrens 1112fa9e4066Sahrens static int 1113fa9e4066Sahrens dbuf_undirty(dmu_buf_impl_t *db, dmu_tx_t *tx) 1114fa9e4066Sahrens { 1115fa9e4066Sahrens dnode_t *dn = db->db_dnode; 1116c717a561Smaybee uint64_t txg = tx->tx_txg; 1117c717a561Smaybee dbuf_dirty_record_t *dr; 1118fa9e4066Sahrens 1119c717a561Smaybee ASSERT(txg != 0); 1120ea8dc4b6Seschrock ASSERT(db->db_blkid != DB_BONUS_BLKID); 1121fa9e4066Sahrens 1122fa9e4066Sahrens mutex_enter(&db->db_mtx); 1123fa9e4066Sahrens 1124fa9e4066Sahrens /* 1125fa9e4066Sahrens * If this buffer is not dirty, we're done. 1126fa9e4066Sahrens */ 1127c717a561Smaybee for (dr = db->db_last_dirty; dr; dr = dr->dr_next) 1128c717a561Smaybee if (dr->dr_txg <= txg) 1129c717a561Smaybee break; 1130c717a561Smaybee if (dr == NULL || dr->dr_txg < txg) { 1131fa9e4066Sahrens mutex_exit(&db->db_mtx); 1132fa9e4066Sahrens return (0); 1133fa9e4066Sahrens } 1134c717a561Smaybee ASSERT(dr->dr_txg == txg); 1135fa9e4066Sahrens 1136fa9e4066Sahrens /* 1137fa9e4066Sahrens * If this buffer is currently held, we cannot undirty 1138fa9e4066Sahrens * it, since one of the current holders may be in the 1139fa9e4066Sahrens * middle of an update. Note that users of dbuf_undirty() 1140fa9e4066Sahrens * should not place a hold on the dbuf before the call. 1141fa9e4066Sahrens */ 1142fa9e4066Sahrens if (refcount_count(&db->db_holds) > db->db_dirtycnt) { 1143fa9e4066Sahrens mutex_exit(&db->db_mtx); 114444eda4d7Smaybee /* Make sure we don't toss this buffer at sync phase */ 1145fa9e4066Sahrens mutex_enter(&dn->dn_mtx); 1146fa9e4066Sahrens dnode_clear_range(dn, db->db_blkid, 1, tx); 1147fa9e4066Sahrens mutex_exit(&dn->dn_mtx); 1148fa9e4066Sahrens return (0); 1149fa9e4066Sahrens } 1150fa9e4066Sahrens 1151fa9e4066Sahrens dprintf_dbuf(db, "size=%llx\n", (u_longlong_t)db->db.db_size); 1152fa9e4066Sahrens 1153fa9e4066Sahrens ASSERT(db->db.db_size != 0); 1154fa9e4066Sahrens 1155fa9e4066Sahrens /* XXX would be nice to fix up dn_towrite_space[] */ 1156fa9e4066Sahrens 1157c717a561Smaybee db->db_last_dirty = dr->dr_next; 1158c717a561Smaybee 1159c717a561Smaybee if (dr->dr_parent) { 1160c717a561Smaybee mutex_enter(&dr->dr_parent->dt.di.dr_mtx); 1161c717a561Smaybee list_remove(&dr->dr_parent->dt.di.dr_children, dr); 1162c717a561Smaybee mutex_exit(&dr->dr_parent->dt.di.dr_mtx); 1163c717a561Smaybee } else if (db->db_level+1 == dn->dn_nlevels) { 1164c717a561Smaybee ASSERT3P(db->db_parent, ==, dn->dn_dbuf); 1165fa9e4066Sahrens mutex_enter(&dn->dn_mtx); 1166c717a561Smaybee list_remove(&dn->dn_dirty_records[txg & TXG_MASK], dr); 1167fa9e4066Sahrens mutex_exit(&dn->dn_mtx); 1168c717a561Smaybee } 1169c717a561Smaybee 1170c717a561Smaybee if (db->db_level == 0) { 1171c717a561Smaybee dbuf_unoverride(dr); 1172c717a561Smaybee 1173c717a561Smaybee ASSERT(db->db_buf != NULL); 1174c717a561Smaybee ASSERT(dr->dt.dl.dr_data != NULL); 1175c717a561Smaybee if (dr->dt.dl.dr_data != db->db_buf) 1176c717a561Smaybee VERIFY(arc_buf_remove_ref(dr->dt.dl.dr_data, db) == 1); 1177c717a561Smaybee } else { 1178c717a561Smaybee ASSERT(db->db_buf != NULL); 1179c717a561Smaybee ASSERT(list_head(&dr->dt.di.dr_children) == NULL); 1180c25056deSgw25295 mutex_destroy(&dr->dt.di.dr_mtx); 1181c25056deSgw25295 list_destroy(&dr->dt.di.dr_children); 1182c717a561Smaybee } 1183c717a561Smaybee kmem_free(dr, sizeof (dbuf_dirty_record_t)); 1184fa9e4066Sahrens 1185fa9e4066Sahrens ASSERT(db->db_dirtycnt > 0); 1186fa9e4066Sahrens db->db_dirtycnt -= 1; 1187fa9e4066Sahrens 1188c717a561Smaybee if (refcount_remove(&db->db_holds, (void *)(uintptr_t)txg) == 0) { 1189ea8dc4b6Seschrock arc_buf_t *buf = db->db_buf; 1190fa9e4066Sahrens 1191ea8dc4b6Seschrock ASSERT(arc_released(buf)); 1192ea8dc4b6Seschrock dbuf_set_data(db, NULL); 1193ea8dc4b6Seschrock VERIFY(arc_buf_remove_ref(buf, db) == 1); 1194fa9e4066Sahrens dbuf_evict(db); 1195fa9e4066Sahrens return (1); 1196fa9e4066Sahrens } 1197fa9e4066Sahrens 1198fa9e4066Sahrens mutex_exit(&db->db_mtx); 1199fa9e4066Sahrens return (0); 1200fa9e4066Sahrens } 1201fa9e4066Sahrens 1202fa9e4066Sahrens #pragma weak dmu_buf_will_dirty = dbuf_will_dirty 1203fa9e4066Sahrens void 1204fa9e4066Sahrens dbuf_will_dirty(dmu_buf_impl_t *db, dmu_tx_t *tx) 1205fa9e4066Sahrens { 1206fa9e4066Sahrens int rf = DB_RF_MUST_SUCCEED; 1207fa9e4066Sahrens 1208fa9e4066Sahrens ASSERT(tx->tx_txg != 0); 1209fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 1210fa9e4066Sahrens 1211fa9e4066Sahrens if (RW_WRITE_HELD(&db->db_dnode->dn_struct_rwlock)) 1212fa9e4066Sahrens rf |= DB_RF_HAVESTRUCT; 1213ea8dc4b6Seschrock (void) dbuf_read(db, NULL, rf); 1214c717a561Smaybee (void) dbuf_dirty(db, tx); 1215fa9e4066Sahrens } 1216fa9e4066Sahrens 1217fa9e4066Sahrens void 1218ea8dc4b6Seschrock dmu_buf_will_fill(dmu_buf_t *db_fake, dmu_tx_t *tx) 1219fa9e4066Sahrens { 1220ea8dc4b6Seschrock dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 1221ea8dc4b6Seschrock 1222ea8dc4b6Seschrock ASSERT(db->db_blkid != DB_BONUS_BLKID); 1223fa9e4066Sahrens ASSERT(tx->tx_txg != 0); 1224fa9e4066Sahrens ASSERT(db->db_level == 0); 1225fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 1226fa9e4066Sahrens 1227ea8dc4b6Seschrock ASSERT(db->db.db_object != DMU_META_DNODE_OBJECT || 1228fa9e4066Sahrens dmu_tx_private_ok(tx)); 1229fa9e4066Sahrens 1230fa9e4066Sahrens dbuf_noread(db); 1231c717a561Smaybee (void) dbuf_dirty(db, tx); 1232fa9e4066Sahrens } 1233fa9e4066Sahrens 1234fa9e4066Sahrens #pragma weak dmu_buf_fill_done = dbuf_fill_done 1235fa9e4066Sahrens /* ARGSUSED */ 1236fa9e4066Sahrens void 1237fa9e4066Sahrens dbuf_fill_done(dmu_buf_impl_t *db, dmu_tx_t *tx) 1238fa9e4066Sahrens { 1239fa9e4066Sahrens mutex_enter(&db->db_mtx); 12409c9dc39aSek110237 DBUF_VERIFY(db); 1241fa9e4066Sahrens 1242fa9e4066Sahrens if (db->db_state == DB_FILL) { 1243c717a561Smaybee if (db->db_level == 0 && db->db_freed_in_flight) { 1244ea8dc4b6Seschrock ASSERT(db->db_blkid != DB_BONUS_BLKID); 1245fa9e4066Sahrens /* we were freed while filling */ 1246fa9e4066Sahrens /* XXX dbuf_undirty? */ 1247fa9e4066Sahrens bzero(db->db.db_data, db->db.db_size); 1248c717a561Smaybee db->db_freed_in_flight = FALSE; 1249fa9e4066Sahrens } 1250fa9e4066Sahrens db->db_state = DB_CACHED; 1251fa9e4066Sahrens cv_broadcast(&db->db_changed); 1252fa9e4066Sahrens } 1253fa9e4066Sahrens mutex_exit(&db->db_mtx); 1254fa9e4066Sahrens } 1255fa9e4066Sahrens 1256ea8dc4b6Seschrock /* 1257ea8dc4b6Seschrock * "Clear" the contents of this dbuf. This will mark the dbuf 1258ea8dc4b6Seschrock * EVICTING and clear *most* of its references. Unfortunetely, 1259ea8dc4b6Seschrock * when we are not holding the dn_dbufs_mtx, we can't clear the 1260ea8dc4b6Seschrock * entry in the dn_dbufs list. We have to wait until dbuf_destroy() 1261ea8dc4b6Seschrock * in this case. For callers from the DMU we will usually see: 1262ea8dc4b6Seschrock * dbuf_clear()->arc_buf_evict()->dbuf_do_evict()->dbuf_destroy() 1263ea8dc4b6Seschrock * For the arc callback, we will usually see: 1264ea8dc4b6Seschrock * dbuf_do_evict()->dbuf_clear();dbuf_destroy() 1265ea8dc4b6Seschrock * Sometimes, though, we will get a mix of these two: 1266ea8dc4b6Seschrock * DMU: dbuf_clear()->arc_buf_evict() 1267ea8dc4b6Seschrock * ARC: dbuf_do_evict()->dbuf_destroy() 1268ea8dc4b6Seschrock */ 1269ea8dc4b6Seschrock void 1270fa9e4066Sahrens dbuf_clear(dmu_buf_impl_t *db) 1271fa9e4066Sahrens { 1272fa9e4066Sahrens dnode_t *dn = db->db_dnode; 1273ea8dc4b6Seschrock dmu_buf_impl_t *parent = db->db_parent; 1274c543ec06Sahrens dmu_buf_impl_t *dndb = dn->dn_dbuf; 1275ea8dc4b6Seschrock int dbuf_gone = FALSE; 1276fa9e4066Sahrens 1277fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 1278fa9e4066Sahrens ASSERT(refcount_is_zero(&db->db_holds)); 1279fa9e4066Sahrens 1280ea8dc4b6Seschrock dbuf_evict_user(db); 1281ea8dc4b6Seschrock 1282fa9e4066Sahrens if (db->db_state == DB_CACHED) { 1283ea8dc4b6Seschrock ASSERT(db->db.db_data != NULL); 12840e8c6158Smaybee if (db->db_blkid == DB_BONUS_BLKID) { 1285ea8dc4b6Seschrock zio_buf_free(db->db.db_data, DN_MAX_BONUSLEN); 12860e8c6158Smaybee arc_space_return(DN_MAX_BONUSLEN); 12870e8c6158Smaybee } 1288fa9e4066Sahrens db->db.db_data = NULL; 1289fa9e4066Sahrens db->db_state = DB_UNCACHED; 1290fa9e4066Sahrens } 1291fa9e4066Sahrens 1292fa9e4066Sahrens ASSERT3U(db->db_state, ==, DB_UNCACHED); 1293fa9e4066Sahrens ASSERT(db->db_data_pending == NULL); 1294fa9e4066Sahrens 1295ea8dc4b6Seschrock db->db_state = DB_EVICTING; 1296ea8dc4b6Seschrock db->db_blkptr = NULL; 1297ea8dc4b6Seschrock 1298ea8dc4b6Seschrock if (db->db_blkid != DB_BONUS_BLKID && MUTEX_HELD(&dn->dn_dbufs_mtx)) { 1299ea8dc4b6Seschrock list_remove(&dn->dn_dbufs, db); 1300ea8dc4b6Seschrock dnode_rele(dn, db); 1301*1934e92fSmaybee db->db_dnode = NULL; 1302ea8dc4b6Seschrock } 1303ea8dc4b6Seschrock 1304ea8dc4b6Seschrock if (db->db_buf) 1305ea8dc4b6Seschrock dbuf_gone = arc_buf_evict(db->db_buf); 1306ea8dc4b6Seschrock 1307ea8dc4b6Seschrock if (!dbuf_gone) 1308fa9e4066Sahrens mutex_exit(&db->db_mtx); 1309fa9e4066Sahrens 1310fa9e4066Sahrens /* 1311fa9e4066Sahrens * If this dbuf is referened from an indirect dbuf, 1312fa9e4066Sahrens * decrement the ref count on the indirect dbuf. 1313fa9e4066Sahrens */ 1314c543ec06Sahrens if (parent && parent != dndb) 1315ea8dc4b6Seschrock dbuf_rele(parent, db); 1316fa9e4066Sahrens } 1317fa9e4066Sahrens 1318fa9e4066Sahrens static int 1319fa9e4066Sahrens dbuf_findbp(dnode_t *dn, int level, uint64_t blkid, int fail_sparse, 1320fa9e4066Sahrens dmu_buf_impl_t **parentp, blkptr_t **bpp) 1321fa9e4066Sahrens { 1322fa9e4066Sahrens int nlevels, epbs; 1323fa9e4066Sahrens 13240b69c2f0Sahrens *parentp = NULL; 13250b69c2f0Sahrens *bpp = NULL; 13260b69c2f0Sahrens 1327ea8dc4b6Seschrock ASSERT(blkid != DB_BONUS_BLKID); 1328ea8dc4b6Seschrock 1329fa9e4066Sahrens if (dn->dn_phys->dn_nlevels == 0) 1330fa9e4066Sahrens nlevels = 1; 1331fa9e4066Sahrens else 1332fa9e4066Sahrens nlevels = dn->dn_phys->dn_nlevels; 1333fa9e4066Sahrens 1334fa9e4066Sahrens epbs = dn->dn_indblkshift - SPA_BLKPTRSHIFT; 1335fa9e4066Sahrens 1336fa9e4066Sahrens ASSERT3U(level * epbs, <, 64); 1337fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 1338ea8dc4b6Seschrock if (level >= nlevels || 1339fa9e4066Sahrens (blkid > (dn->dn_phys->dn_maxblkid >> (level * epbs)))) { 1340fa9e4066Sahrens /* the buffer has no parent yet */ 1341fa9e4066Sahrens return (ENOENT); 1342fa9e4066Sahrens } else if (level < nlevels-1) { 1343fa9e4066Sahrens /* this block is referenced from an indirect block */ 1344fa9e4066Sahrens int err = dbuf_hold_impl(dn, level+1, 1345fa9e4066Sahrens blkid >> epbs, fail_sparse, NULL, parentp); 1346fa9e4066Sahrens if (err) 1347fa9e4066Sahrens return (err); 1348ea8dc4b6Seschrock err = dbuf_read(*parentp, NULL, 1349ea8dc4b6Seschrock (DB_RF_HAVESTRUCT | DB_RF_NOPREFETCH | DB_RF_CANFAIL)); 1350c543ec06Sahrens if (err) { 1351c543ec06Sahrens dbuf_rele(*parentp, NULL); 1352c543ec06Sahrens *parentp = NULL; 1353c543ec06Sahrens return (err); 1354c543ec06Sahrens } 1355fa9e4066Sahrens *bpp = ((blkptr_t *)(*parentp)->db.db_data) + 1356fa9e4066Sahrens (blkid & ((1ULL << epbs) - 1)); 1357c543ec06Sahrens return (0); 1358fa9e4066Sahrens } else { 1359fa9e4066Sahrens /* the block is referenced from the dnode */ 1360fa9e4066Sahrens ASSERT3U(level, ==, nlevels-1); 1361fa9e4066Sahrens ASSERT(dn->dn_phys->dn_nblkptr == 0 || 1362fa9e4066Sahrens blkid < dn->dn_phys->dn_nblkptr); 1363c543ec06Sahrens if (dn->dn_dbuf) { 1364c543ec06Sahrens dbuf_add_ref(dn->dn_dbuf, NULL); 1365fa9e4066Sahrens *parentp = dn->dn_dbuf; 1366c543ec06Sahrens } 1367fa9e4066Sahrens *bpp = &dn->dn_phys->dn_blkptr[blkid]; 1368fa9e4066Sahrens return (0); 1369fa9e4066Sahrens } 1370fa9e4066Sahrens } 1371fa9e4066Sahrens 1372fa9e4066Sahrens static dmu_buf_impl_t * 1373fa9e4066Sahrens dbuf_create(dnode_t *dn, uint8_t level, uint64_t blkid, 1374fa9e4066Sahrens dmu_buf_impl_t *parent, blkptr_t *blkptr) 1375fa9e4066Sahrens { 1376fa9e4066Sahrens objset_impl_t *os = dn->dn_objset; 1377fa9e4066Sahrens dmu_buf_impl_t *db, *odb; 1378fa9e4066Sahrens 1379fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 1380fa9e4066Sahrens ASSERT(dn->dn_type != DMU_OT_NONE); 1381fa9e4066Sahrens 1382fa9e4066Sahrens db = kmem_cache_alloc(dbuf_cache, KM_SLEEP); 1383fa9e4066Sahrens 1384fa9e4066Sahrens db->db_objset = os; 1385fa9e4066Sahrens db->db.db_object = dn->dn_object; 1386fa9e4066Sahrens db->db_level = level; 1387fa9e4066Sahrens db->db_blkid = blkid; 1388c717a561Smaybee db->db_last_dirty = NULL; 1389ea8dc4b6Seschrock db->db_dirtycnt = 0; 1390ea8dc4b6Seschrock db->db_dnode = dn; 1391ea8dc4b6Seschrock db->db_parent = parent; 1392ea8dc4b6Seschrock db->db_blkptr = blkptr; 1393fa9e4066Sahrens 1394c717a561Smaybee db->db_user_ptr = NULL; 1395c717a561Smaybee db->db_user_data_ptr_ptr = NULL; 1396c717a561Smaybee db->db_evict_func = NULL; 1397c717a561Smaybee db->db_immediate_evict = 0; 1398c717a561Smaybee db->db_freed_in_flight = 0; 1399ea8dc4b6Seschrock 1400ea8dc4b6Seschrock if (blkid == DB_BONUS_BLKID) { 1401ea8dc4b6Seschrock ASSERT3P(parent, ==, dn->dn_dbuf); 1402*1934e92fSmaybee db->db.db_size = DN_MAX_BONUSLEN - 1403*1934e92fSmaybee (dn->dn_nblkptr-1) * sizeof (blkptr_t); 1404*1934e92fSmaybee ASSERT3U(db->db.db_size, >=, dn->dn_bonuslen); 1405fa9e4066Sahrens db->db.db_offset = DB_BONUS_BLKID; 1406ea8dc4b6Seschrock db->db_state = DB_UNCACHED; 1407ea8dc4b6Seschrock /* the bonus dbuf is not placed in the hash table */ 14080e8c6158Smaybee arc_space_consume(sizeof (dmu_buf_impl_t)); 1409ea8dc4b6Seschrock return (db); 1410fa9e4066Sahrens } else { 1411fa9e4066Sahrens int blocksize = 1412fa9e4066Sahrens db->db_level ? 1<<dn->dn_indblkshift : dn->dn_datablksz; 1413fa9e4066Sahrens db->db.db_size = blocksize; 1414fa9e4066Sahrens db->db.db_offset = db->db_blkid * blocksize; 1415fa9e4066Sahrens } 1416fa9e4066Sahrens 1417fa9e4066Sahrens /* 1418fa9e4066Sahrens * Hold the dn_dbufs_mtx while we get the new dbuf 1419fa9e4066Sahrens * in the hash table *and* added to the dbufs list. 1420fa9e4066Sahrens * This prevents a possible deadlock with someone 1421fa9e4066Sahrens * trying to look up this dbuf before its added to the 1422fa9e4066Sahrens * dn_dbufs list. 1423fa9e4066Sahrens */ 1424fa9e4066Sahrens mutex_enter(&dn->dn_dbufs_mtx); 1425ea8dc4b6Seschrock db->db_state = DB_EVICTING; 1426fa9e4066Sahrens if ((odb = dbuf_hash_insert(db)) != NULL) { 1427fa9e4066Sahrens /* someone else inserted it first */ 1428fa9e4066Sahrens kmem_cache_free(dbuf_cache, db); 1429fa9e4066Sahrens mutex_exit(&dn->dn_dbufs_mtx); 1430fa9e4066Sahrens return (odb); 1431fa9e4066Sahrens } 1432fa9e4066Sahrens list_insert_head(&dn->dn_dbufs, db); 1433ea8dc4b6Seschrock db->db_state = DB_UNCACHED; 1434fa9e4066Sahrens mutex_exit(&dn->dn_dbufs_mtx); 14350e8c6158Smaybee arc_space_consume(sizeof (dmu_buf_impl_t)); 1436fa9e4066Sahrens 1437fa9e4066Sahrens if (parent && parent != dn->dn_dbuf) 1438fa9e4066Sahrens dbuf_add_ref(parent, db); 1439fa9e4066Sahrens 1440ea8dc4b6Seschrock ASSERT(dn->dn_object == DMU_META_DNODE_OBJECT || 1441ea8dc4b6Seschrock refcount_count(&dn->dn_holds) > 0); 1442fa9e4066Sahrens (void) refcount_add(&dn->dn_holds, db); 1443fa9e4066Sahrens 1444fa9e4066Sahrens dprintf_dbuf(db, "db=%p\n", db); 1445fa9e4066Sahrens 1446fa9e4066Sahrens return (db); 1447fa9e4066Sahrens } 1448fa9e4066Sahrens 1449fa9e4066Sahrens static int 1450ea8dc4b6Seschrock dbuf_do_evict(void *private) 1451fa9e4066Sahrens { 1452ea8dc4b6Seschrock arc_buf_t *buf = private; 1453ea8dc4b6Seschrock dmu_buf_impl_t *db = buf->b_private; 1454fa9e4066Sahrens 1455ea8dc4b6Seschrock if (!MUTEX_HELD(&db->db_mtx)) 1456ea8dc4b6Seschrock mutex_enter(&db->db_mtx); 1457ea8dc4b6Seschrock 1458ea8dc4b6Seschrock ASSERT(refcount_is_zero(&db->db_holds)); 1459ea8dc4b6Seschrock 1460ea8dc4b6Seschrock if (db->db_state != DB_EVICTING) { 1461ea8dc4b6Seschrock ASSERT(db->db_state == DB_CACHED); 14629c9dc39aSek110237 DBUF_VERIFY(db); 1463ea8dc4b6Seschrock db->db_buf = NULL; 1464ea8dc4b6Seschrock dbuf_evict(db); 1465ea8dc4b6Seschrock } else { 1466ea8dc4b6Seschrock mutex_exit(&db->db_mtx); 1467ea8dc4b6Seschrock dbuf_destroy(db); 1468fa9e4066Sahrens } 1469ea8dc4b6Seschrock return (0); 1470fa9e4066Sahrens } 1471fa9e4066Sahrens 1472fa9e4066Sahrens static void 1473fa9e4066Sahrens dbuf_destroy(dmu_buf_impl_t *db) 1474fa9e4066Sahrens { 1475fa9e4066Sahrens ASSERT(refcount_is_zero(&db->db_holds)); 1476fa9e4066Sahrens 1477ea8dc4b6Seschrock if (db->db_blkid != DB_BONUS_BLKID) { 1478ea8dc4b6Seschrock /* 1479ea8dc4b6Seschrock * If this dbuf is still on the dn_dbufs list, 1480ea8dc4b6Seschrock * remove it from that list. 1481ea8dc4b6Seschrock */ 1482*1934e92fSmaybee if (db->db_dnode) { 1483*1934e92fSmaybee dnode_t *dn = db->db_dnode; 1484*1934e92fSmaybee 1485*1934e92fSmaybee mutex_enter(&dn->dn_dbufs_mtx); 1486ea8dc4b6Seschrock list_remove(&dn->dn_dbufs, db); 1487ea8dc4b6Seschrock mutex_exit(&dn->dn_dbufs_mtx); 1488ea8dc4b6Seschrock 1489ea8dc4b6Seschrock dnode_rele(dn, db); 1490*1934e92fSmaybee db->db_dnode = NULL; 1491ea8dc4b6Seschrock } 1492ea8dc4b6Seschrock dbuf_hash_remove(db); 1493ea8dc4b6Seschrock } 1494ea8dc4b6Seschrock db->db_parent = NULL; 1495ea8dc4b6Seschrock db->db_buf = NULL; 1496ea8dc4b6Seschrock 1497f82bfe17Sgw25295 ASSERT(!list_link_active(&db->db_link)); 1498fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 1499fa9e4066Sahrens ASSERT(db->db_hash_next == NULL); 1500fa9e4066Sahrens ASSERT(db->db_blkptr == NULL); 1501fa9e4066Sahrens ASSERT(db->db_data_pending == NULL); 1502fa9e4066Sahrens 1503fa9e4066Sahrens kmem_cache_free(dbuf_cache, db); 15040e8c6158Smaybee arc_space_return(sizeof (dmu_buf_impl_t)); 1505fa9e4066Sahrens } 1506fa9e4066Sahrens 1507fa9e4066Sahrens void 1508fa9e4066Sahrens dbuf_prefetch(dnode_t *dn, uint64_t blkid) 1509fa9e4066Sahrens { 151013506d1eSmaybee dmu_buf_impl_t *db = NULL; 1511fa9e4066Sahrens blkptr_t *bp = NULL; 1512fa9e4066Sahrens 1513fa9e4066Sahrens ASSERT(blkid != DB_BONUS_BLKID); 1514fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 1515fa9e4066Sahrens 1516fa9e4066Sahrens if (dnode_block_freed(dn, blkid)) 1517fa9e4066Sahrens return; 1518fa9e4066Sahrens 1519fa9e4066Sahrens /* dbuf_find() returns with db_mtx held */ 1520fa9e4066Sahrens if (db = dbuf_find(dn, 0, blkid)) { 152113506d1eSmaybee if (refcount_count(&db->db_holds) > 0) { 1522fa9e4066Sahrens /* 152313506d1eSmaybee * This dbuf is active. We assume that it is 152413506d1eSmaybee * already CACHED, or else about to be either 1525fa9e4066Sahrens * read or filled. 1526fa9e4066Sahrens */ 1527fa9e4066Sahrens mutex_exit(&db->db_mtx); 1528fa9e4066Sahrens return; 1529fa9e4066Sahrens } 153013506d1eSmaybee mutex_exit(&db->db_mtx); 15310b69c2f0Sahrens db = NULL; 153213506d1eSmaybee } 1533fa9e4066Sahrens 153413506d1eSmaybee if (dbuf_findbp(dn, 0, blkid, TRUE, &db, &bp) == 0) { 1535fa9e4066Sahrens if (bp && !BP_IS_HOLE(bp)) { 153613506d1eSmaybee uint32_t aflags = ARC_NOWAIT | ARC_PREFETCH; 1537ea8dc4b6Seschrock zbookmark_t zb; 1538ea8dc4b6Seschrock zb.zb_objset = dn->dn_objset->os_dsl_dataset ? 1539ea8dc4b6Seschrock dn->dn_objset->os_dsl_dataset->ds_object : 0; 1540ea8dc4b6Seschrock zb.zb_object = dn->dn_object; 1541ea8dc4b6Seschrock zb.zb_level = 0; 1542ea8dc4b6Seschrock zb.zb_blkid = blkid; 1543ea8dc4b6Seschrock 1544fa9e4066Sahrens (void) arc_read(NULL, dn->dn_objset->os_spa, bp, 1545fa9e4066Sahrens dmu_ot[dn->dn_type].ot_byteswap, 1546fa9e4066Sahrens NULL, NULL, ZIO_PRIORITY_ASYNC_READ, 1547fa9e4066Sahrens ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE, 154813506d1eSmaybee &aflags, &zb); 1549fa9e4066Sahrens } 155013506d1eSmaybee if (db) 155113506d1eSmaybee dbuf_rele(db, NULL); 1552fa9e4066Sahrens } 1553fa9e4066Sahrens } 1554fa9e4066Sahrens 1555fa9e4066Sahrens /* 1556fa9e4066Sahrens * Returns with db_holds incremented, and db_mtx not held. 1557fa9e4066Sahrens * Note: dn_struct_rwlock must be held. 1558fa9e4066Sahrens */ 1559fa9e4066Sahrens int 1560fa9e4066Sahrens dbuf_hold_impl(dnode_t *dn, uint8_t level, uint64_t blkid, int fail_sparse, 1561fa9e4066Sahrens void *tag, dmu_buf_impl_t **dbp) 1562fa9e4066Sahrens { 1563fa9e4066Sahrens dmu_buf_impl_t *db, *parent = NULL; 1564fa9e4066Sahrens 1565ea8dc4b6Seschrock ASSERT(blkid != DB_BONUS_BLKID); 1566fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 1567fa9e4066Sahrens ASSERT3U(dn->dn_nlevels, >, level); 1568fa9e4066Sahrens 1569fa9e4066Sahrens *dbp = NULL; 1570ea8dc4b6Seschrock top: 1571fa9e4066Sahrens /* dbuf_find() returns with db_mtx held */ 1572fa9e4066Sahrens db = dbuf_find(dn, level, blkid); 1573fa9e4066Sahrens 1574fa9e4066Sahrens if (db == NULL) { 1575fa9e4066Sahrens blkptr_t *bp = NULL; 1576fa9e4066Sahrens int err; 1577fa9e4066Sahrens 1578c543ec06Sahrens ASSERT3P(parent, ==, NULL); 1579fa9e4066Sahrens err = dbuf_findbp(dn, level, blkid, fail_sparse, &parent, &bp); 1580fa9e4066Sahrens if (fail_sparse) { 1581fa9e4066Sahrens if (err == 0 && bp && BP_IS_HOLE(bp)) 1582fa9e4066Sahrens err = ENOENT; 1583fa9e4066Sahrens if (err) { 1584c543ec06Sahrens if (parent) 1585ea8dc4b6Seschrock dbuf_rele(parent, NULL); 1586fa9e4066Sahrens return (err); 1587fa9e4066Sahrens } 1588fa9e4066Sahrens } 1589ea8dc4b6Seschrock if (err && err != ENOENT) 1590ea8dc4b6Seschrock return (err); 1591fa9e4066Sahrens db = dbuf_create(dn, level, blkid, parent, bp); 1592fa9e4066Sahrens } 1593fa9e4066Sahrens 1594ea8dc4b6Seschrock if (db->db_buf && refcount_is_zero(&db->db_holds)) { 1595ea8dc4b6Seschrock arc_buf_add_ref(db->db_buf, db); 1596ea8dc4b6Seschrock if (db->db_buf->b_data == NULL) { 1597ea8dc4b6Seschrock dbuf_clear(db); 1598c543ec06Sahrens if (parent) { 1599c543ec06Sahrens dbuf_rele(parent, NULL); 1600c543ec06Sahrens parent = NULL; 1601c543ec06Sahrens } 1602ea8dc4b6Seschrock goto top; 1603ea8dc4b6Seschrock } 1604ea8dc4b6Seschrock ASSERT3P(db->db.db_data, ==, db->db_buf->b_data); 1605ea8dc4b6Seschrock } 1606ea8dc4b6Seschrock 1607ea8dc4b6Seschrock ASSERT(db->db_buf == NULL || arc_referenced(db->db_buf)); 1608ea8dc4b6Seschrock 1609fa9e4066Sahrens /* 1610c717a561Smaybee * If this buffer is currently syncing out, and we are are 1611c717a561Smaybee * still referencing it from db_data, we need to make a copy 1612c717a561Smaybee * of it in case we decide we want to dirty it again in this txg. 1613fa9e4066Sahrens */ 1614c717a561Smaybee if (db->db_level == 0 && db->db_blkid != DB_BONUS_BLKID && 1615ea8dc4b6Seschrock dn->dn_object != DMU_META_DNODE_OBJECT && 1616c717a561Smaybee db->db_state == DB_CACHED && db->db_data_pending) { 1617c717a561Smaybee dbuf_dirty_record_t *dr = db->db_data_pending; 1618c717a561Smaybee 1619c717a561Smaybee if (dr->dt.dl.dr_data == db->db_buf) { 1620ad23a2dbSjohansen arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 1621fa9e4066Sahrens 1622c717a561Smaybee dbuf_set_data(db, 1623c717a561Smaybee arc_buf_alloc(db->db_dnode->dn_objset->os_spa, 1624c717a561Smaybee db->db.db_size, db, type)); 1625c717a561Smaybee bcopy(dr->dt.dl.dr_data->b_data, db->db.db_data, 1626fa9e4066Sahrens db->db.db_size); 1627fa9e4066Sahrens } 1628c717a561Smaybee } 1629fa9e4066Sahrens 1630ea8dc4b6Seschrock (void) refcount_add(&db->db_holds, tag); 1631fa9e4066Sahrens dbuf_update_data(db); 16329c9dc39aSek110237 DBUF_VERIFY(db); 1633fa9e4066Sahrens mutex_exit(&db->db_mtx); 1634fa9e4066Sahrens 1635fa9e4066Sahrens /* NOTE: we can't rele the parent until after we drop the db_mtx */ 1636c543ec06Sahrens if (parent) 1637ea8dc4b6Seschrock dbuf_rele(parent, NULL); 1638fa9e4066Sahrens 1639fa9e4066Sahrens ASSERT3P(db->db_dnode, ==, dn); 1640fa9e4066Sahrens ASSERT3U(db->db_blkid, ==, blkid); 1641fa9e4066Sahrens ASSERT3U(db->db_level, ==, level); 1642fa9e4066Sahrens *dbp = db; 1643fa9e4066Sahrens 1644fa9e4066Sahrens return (0); 1645fa9e4066Sahrens } 1646fa9e4066Sahrens 1647fa9e4066Sahrens dmu_buf_impl_t * 1648ea8dc4b6Seschrock dbuf_hold(dnode_t *dn, uint64_t blkid, void *tag) 1649fa9e4066Sahrens { 1650fa9e4066Sahrens dmu_buf_impl_t *db; 1651ea8dc4b6Seschrock int err = dbuf_hold_impl(dn, 0, blkid, FALSE, tag, &db); 1652ea8dc4b6Seschrock return (err ? NULL : db); 1653fa9e4066Sahrens } 1654fa9e4066Sahrens 1655fa9e4066Sahrens dmu_buf_impl_t * 1656fa9e4066Sahrens dbuf_hold_level(dnode_t *dn, int level, uint64_t blkid, void *tag) 1657fa9e4066Sahrens { 1658fa9e4066Sahrens dmu_buf_impl_t *db; 1659ea8dc4b6Seschrock int err = dbuf_hold_impl(dn, level, blkid, FALSE, tag, &db); 1660ea8dc4b6Seschrock return (err ? NULL : db); 1661fa9e4066Sahrens } 1662fa9e4066Sahrens 1663*1934e92fSmaybee void 1664ea8dc4b6Seschrock dbuf_create_bonus(dnode_t *dn) 1665fa9e4066Sahrens { 1666ea8dc4b6Seschrock ASSERT(RW_WRITE_HELD(&dn->dn_struct_rwlock)); 1667ea8dc4b6Seschrock 1668ea8dc4b6Seschrock ASSERT(dn->dn_bonus == NULL); 1669*1934e92fSmaybee dn->dn_bonus = dbuf_create(dn, 0, DB_BONUS_BLKID, dn->dn_dbuf, NULL); 1670fa9e4066Sahrens } 1671fa9e4066Sahrens 1672ea8dc4b6Seschrock #pragma weak dmu_buf_add_ref = dbuf_add_ref 1673fa9e4066Sahrens void 1674fa9e4066Sahrens dbuf_add_ref(dmu_buf_impl_t *db, void *tag) 1675fa9e4066Sahrens { 1676ea8dc4b6Seschrock int64_t holds = refcount_add(&db->db_holds, tag); 1677ea8dc4b6Seschrock ASSERT(holds > 1); 1678fa9e4066Sahrens } 1679fa9e4066Sahrens 1680ea8dc4b6Seschrock #pragma weak dmu_buf_rele = dbuf_rele 1681fa9e4066Sahrens void 1682ea8dc4b6Seschrock dbuf_rele(dmu_buf_impl_t *db, void *tag) 1683fa9e4066Sahrens { 1684fa9e4066Sahrens int64_t holds; 1685fa9e4066Sahrens 1686fa9e4066Sahrens mutex_enter(&db->db_mtx); 16879c9dc39aSek110237 DBUF_VERIFY(db); 1688fa9e4066Sahrens 1689fa9e4066Sahrens holds = refcount_remove(&db->db_holds, tag); 1690ea8dc4b6Seschrock ASSERT(holds >= 0); 1691fa9e4066Sahrens 1692c717a561Smaybee /* 1693c717a561Smaybee * We can't freeze indirects if there is a possibility that they 1694c717a561Smaybee * may be modified in the current syncing context. 1695c717a561Smaybee */ 1696c717a561Smaybee if (db->db_buf && holds == (db->db_level == 0 ? db->db_dirtycnt : 0)) 16976b4acc8bSahrens arc_buf_freeze(db->db_buf); 16986b4acc8bSahrens 1699fa9e4066Sahrens if (holds == db->db_dirtycnt && 1700c717a561Smaybee db->db_level == 0 && db->db_immediate_evict) 1701fa9e4066Sahrens dbuf_evict_user(db); 1702ea8dc4b6Seschrock 1703ea8dc4b6Seschrock if (holds == 0) { 1704ea8dc4b6Seschrock if (db->db_blkid == DB_BONUS_BLKID) { 1705ea8dc4b6Seschrock mutex_exit(&db->db_mtx); 1706ea8dc4b6Seschrock dnode_rele(db->db_dnode, db); 1707ea8dc4b6Seschrock } else if (db->db_buf == NULL) { 1708ea8dc4b6Seschrock /* 1709ea8dc4b6Seschrock * This is a special case: we never associated this 1710ea8dc4b6Seschrock * dbuf with any data allocated from the ARC. 1711ea8dc4b6Seschrock */ 1712ea8dc4b6Seschrock ASSERT3U(db->db_state, ==, DB_UNCACHED); 1713ea8dc4b6Seschrock dbuf_evict(db); 1714ea8dc4b6Seschrock } else if (arc_released(db->db_buf)) { 1715ea8dc4b6Seschrock arc_buf_t *buf = db->db_buf; 1716ea8dc4b6Seschrock /* 1717ea8dc4b6Seschrock * This dbuf has anonymous data associated with it. 1718ea8dc4b6Seschrock */ 1719ea8dc4b6Seschrock dbuf_set_data(db, NULL); 1720ea8dc4b6Seschrock VERIFY(arc_buf_remove_ref(buf, db) == 1); 1721ea8dc4b6Seschrock dbuf_evict(db); 1722ea8dc4b6Seschrock } else { 1723ea8dc4b6Seschrock VERIFY(arc_buf_remove_ref(db->db_buf, db) == 0); 1724fa9e4066Sahrens mutex_exit(&db->db_mtx); 1725fa9e4066Sahrens } 1726ea8dc4b6Seschrock } else { 1727ea8dc4b6Seschrock mutex_exit(&db->db_mtx); 1728fa9e4066Sahrens } 1729fa9e4066Sahrens } 1730fa9e4066Sahrens 1731fa9e4066Sahrens #pragma weak dmu_buf_refcount = dbuf_refcount 1732fa9e4066Sahrens uint64_t 1733fa9e4066Sahrens dbuf_refcount(dmu_buf_impl_t *db) 1734fa9e4066Sahrens { 1735fa9e4066Sahrens return (refcount_count(&db->db_holds)); 1736fa9e4066Sahrens } 1737fa9e4066Sahrens 1738fa9e4066Sahrens void * 1739fa9e4066Sahrens dmu_buf_set_user(dmu_buf_t *db_fake, void *user_ptr, void *user_data_ptr_ptr, 1740fa9e4066Sahrens dmu_buf_evict_func_t *evict_func) 1741fa9e4066Sahrens { 1742fa9e4066Sahrens return (dmu_buf_update_user(db_fake, NULL, user_ptr, 1743fa9e4066Sahrens user_data_ptr_ptr, evict_func)); 1744fa9e4066Sahrens } 1745fa9e4066Sahrens 1746fa9e4066Sahrens void * 1747fa9e4066Sahrens dmu_buf_set_user_ie(dmu_buf_t *db_fake, void *user_ptr, void *user_data_ptr_ptr, 1748fa9e4066Sahrens dmu_buf_evict_func_t *evict_func) 1749fa9e4066Sahrens { 1750fa9e4066Sahrens dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 1751fa9e4066Sahrens 1752c717a561Smaybee db->db_immediate_evict = TRUE; 1753fa9e4066Sahrens return (dmu_buf_update_user(db_fake, NULL, user_ptr, 1754fa9e4066Sahrens user_data_ptr_ptr, evict_func)); 1755fa9e4066Sahrens } 1756fa9e4066Sahrens 1757fa9e4066Sahrens void * 1758fa9e4066Sahrens dmu_buf_update_user(dmu_buf_t *db_fake, void *old_user_ptr, void *user_ptr, 1759fa9e4066Sahrens void *user_data_ptr_ptr, dmu_buf_evict_func_t *evict_func) 1760fa9e4066Sahrens { 1761fa9e4066Sahrens dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 1762fa9e4066Sahrens ASSERT(db->db_level == 0); 1763fa9e4066Sahrens 1764fa9e4066Sahrens ASSERT((user_ptr == NULL) == (evict_func == NULL)); 1765fa9e4066Sahrens 1766fa9e4066Sahrens mutex_enter(&db->db_mtx); 1767fa9e4066Sahrens 1768c717a561Smaybee if (db->db_user_ptr == old_user_ptr) { 1769c717a561Smaybee db->db_user_ptr = user_ptr; 1770c717a561Smaybee db->db_user_data_ptr_ptr = user_data_ptr_ptr; 1771c717a561Smaybee db->db_evict_func = evict_func; 1772fa9e4066Sahrens 1773fa9e4066Sahrens dbuf_update_data(db); 1774fa9e4066Sahrens } else { 1775c717a561Smaybee old_user_ptr = db->db_user_ptr; 1776fa9e4066Sahrens } 1777fa9e4066Sahrens 1778fa9e4066Sahrens mutex_exit(&db->db_mtx); 1779fa9e4066Sahrens return (old_user_ptr); 1780fa9e4066Sahrens } 1781fa9e4066Sahrens 1782fa9e4066Sahrens void * 1783fa9e4066Sahrens dmu_buf_get_user(dmu_buf_t *db_fake) 1784fa9e4066Sahrens { 1785fa9e4066Sahrens dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 1786fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 1787fa9e4066Sahrens 1788c717a561Smaybee return (db->db_user_ptr); 1789fa9e4066Sahrens } 1790fa9e4066Sahrens 1791c717a561Smaybee static void 1792c717a561Smaybee dbuf_check_blkptr(dnode_t *dn, dmu_buf_impl_t *db) 1793fa9e4066Sahrens { 1794c717a561Smaybee /* ASSERT(dmu_tx_is_syncing(tx) */ 1795c717a561Smaybee ASSERT(MUTEX_HELD(&db->db_mtx)); 1796c717a561Smaybee 1797c717a561Smaybee if (db->db_blkptr != NULL) 1798c717a561Smaybee return; 1799c717a561Smaybee 1800c717a561Smaybee if (db->db_level == dn->dn_phys->dn_nlevels-1) { 1801c717a561Smaybee /* 1802c717a561Smaybee * This buffer was allocated at a time when there was 1803c717a561Smaybee * no available blkptrs from the dnode, or it was 1804c717a561Smaybee * inappropriate to hook it in (i.e., nlevels mis-match). 1805c717a561Smaybee */ 1806c717a561Smaybee ASSERT(db->db_blkid < dn->dn_phys->dn_nblkptr); 1807c717a561Smaybee ASSERT(db->db_parent == NULL); 1808c717a561Smaybee db->db_parent = dn->dn_dbuf; 1809c717a561Smaybee db->db_blkptr = &dn->dn_phys->dn_blkptr[db->db_blkid]; 1810c717a561Smaybee DBUF_VERIFY(db); 1811c717a561Smaybee } else { 1812c717a561Smaybee dmu_buf_impl_t *parent = db->db_parent; 1813c717a561Smaybee int epbs = dn->dn_phys->dn_indblkshift - SPA_BLKPTRSHIFT; 1814c717a561Smaybee 1815c717a561Smaybee ASSERT(dn->dn_phys->dn_nlevels > 1); 1816c717a561Smaybee if (parent == NULL) { 1817c717a561Smaybee mutex_exit(&db->db_mtx); 1818c717a561Smaybee rw_enter(&dn->dn_struct_rwlock, RW_READER); 1819c717a561Smaybee (void) dbuf_hold_impl(dn, db->db_level+1, 1820c717a561Smaybee db->db_blkid >> epbs, FALSE, db, &parent); 1821c717a561Smaybee rw_exit(&dn->dn_struct_rwlock); 1822c717a561Smaybee mutex_enter(&db->db_mtx); 1823c717a561Smaybee db->db_parent = parent; 1824c717a561Smaybee } 1825c717a561Smaybee db->db_blkptr = (blkptr_t *)parent->db.db_data + 1826c717a561Smaybee (db->db_blkid & ((1ULL << epbs) - 1)); 1827c717a561Smaybee DBUF_VERIFY(db); 1828c717a561Smaybee } 1829c717a561Smaybee } 1830c717a561Smaybee 1831c717a561Smaybee static void 1832c717a561Smaybee dbuf_sync_indirect(dbuf_dirty_record_t *dr, dmu_tx_t *tx) 1833c717a561Smaybee { 1834c717a561Smaybee dmu_buf_impl_t *db = dr->dr_dbuf; 1835c717a561Smaybee dnode_t *dn = db->db_dnode; 1836c717a561Smaybee zio_t *zio; 1837c717a561Smaybee 1838c717a561Smaybee ASSERT(dmu_tx_is_syncing(tx)); 1839c717a561Smaybee 1840c717a561Smaybee dprintf_dbuf_bp(db, db->db_blkptr, "blkptr=%p", db->db_blkptr); 1841c717a561Smaybee 1842c717a561Smaybee mutex_enter(&db->db_mtx); 1843c717a561Smaybee 1844c717a561Smaybee ASSERT(db->db_level > 0); 1845c717a561Smaybee DBUF_VERIFY(db); 1846c717a561Smaybee 1847c717a561Smaybee if (db->db_buf == NULL) { 1848c717a561Smaybee mutex_exit(&db->db_mtx); 1849c717a561Smaybee (void) dbuf_read(db, NULL, DB_RF_MUST_SUCCEED); 1850c717a561Smaybee mutex_enter(&db->db_mtx); 1851c717a561Smaybee } 1852c717a561Smaybee ASSERT3U(db->db_state, ==, DB_CACHED); 1853c717a561Smaybee ASSERT3U(db->db.db_size, ==, 1<<dn->dn_phys->dn_indblkshift); 1854c717a561Smaybee ASSERT(db->db_buf != NULL); 1855c717a561Smaybee 1856c717a561Smaybee dbuf_check_blkptr(dn, db); 1857c717a561Smaybee 1858c717a561Smaybee db->db_data_pending = dr; 1859c717a561Smaybee 1860c717a561Smaybee arc_release(db->db_buf, db); 1861af2c4821Smaybee mutex_exit(&db->db_mtx); 1862c717a561Smaybee 1863c717a561Smaybee /* 1864c717a561Smaybee * XXX -- we should design a compression algorithm 1865c717a561Smaybee * that specializes in arrays of bps. 1866c717a561Smaybee */ 1867c717a561Smaybee dbuf_write(dr, db->db_buf, ZIO_CHECKSUM_FLETCHER_4, 1868c717a561Smaybee zfs_mdcomp_disable ? ZIO_COMPRESS_EMPTY : ZIO_COMPRESS_LZJB, tx); 1869c717a561Smaybee 1870c717a561Smaybee zio = dr->dr_zio; 1871c717a561Smaybee mutex_enter(&dr->dt.di.dr_mtx); 1872c717a561Smaybee dbuf_sync_list(&dr->dt.di.dr_children, tx); 1873c717a561Smaybee ASSERT(list_head(&dr->dt.di.dr_children) == NULL); 1874c717a561Smaybee mutex_exit(&dr->dt.di.dr_mtx); 1875c717a561Smaybee zio_nowait(zio); 1876c717a561Smaybee } 1877c717a561Smaybee 1878c717a561Smaybee static void 1879c717a561Smaybee dbuf_sync_leaf(dbuf_dirty_record_t *dr, dmu_tx_t *tx) 1880c717a561Smaybee { 1881c717a561Smaybee arc_buf_t **datap = &dr->dt.dl.dr_data; 1882c717a561Smaybee dmu_buf_impl_t *db = dr->dr_dbuf; 1883fa9e4066Sahrens dnode_t *dn = db->db_dnode; 1884fa9e4066Sahrens objset_impl_t *os = dn->dn_objset; 1885c717a561Smaybee uint64_t txg = tx->tx_txg; 1886ea8dc4b6Seschrock int checksum, compress; 1887fa9e4066Sahrens int blksz; 1888fa9e4066Sahrens 1889fa9e4066Sahrens ASSERT(dmu_tx_is_syncing(tx)); 1890fa9e4066Sahrens 1891fa9e4066Sahrens dprintf_dbuf_bp(db, db->db_blkptr, "blkptr=%p", db->db_blkptr); 1892fa9e4066Sahrens 1893fa9e4066Sahrens mutex_enter(&db->db_mtx); 1894fa9e4066Sahrens /* 1895fa9e4066Sahrens * To be synced, we must be dirtied. But we 1896fa9e4066Sahrens * might have been freed after the dirty. 1897fa9e4066Sahrens */ 1898fa9e4066Sahrens if (db->db_state == DB_UNCACHED) { 1899fa9e4066Sahrens /* This buffer has been freed since it was dirtied */ 1900fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 1901fa9e4066Sahrens } else if (db->db_state == DB_FILL) { 1902fa9e4066Sahrens /* This buffer was freed and is now being re-filled */ 1903c717a561Smaybee ASSERT(db->db.db_data != dr->dt.dl.dr_data); 1904fa9e4066Sahrens } else { 1905fa9e4066Sahrens ASSERT3U(db->db_state, ==, DB_CACHED); 1906fa9e4066Sahrens } 19079c9dc39aSek110237 DBUF_VERIFY(db); 1908fa9e4066Sahrens 1909fa9e4066Sahrens /* 1910c717a561Smaybee * If this is a bonus buffer, simply copy the bonus data into the 1911c717a561Smaybee * dnode. It will be written out when the dnode is synced (and it 1912c717a561Smaybee * will be synced, since it must have been dirty for dbuf_sync to 1913c717a561Smaybee * be called). 1914fa9e4066Sahrens */ 1915ea8dc4b6Seschrock if (db->db_blkid == DB_BONUS_BLKID) { 1916c717a561Smaybee dbuf_dirty_record_t **drp; 1917*1934e92fSmaybee 1918ea8dc4b6Seschrock ASSERT(*datap != NULL); 1919ea8dc4b6Seschrock ASSERT3U(db->db_level, ==, 0); 1920ea8dc4b6Seschrock ASSERT3U(dn->dn_phys->dn_bonuslen, <=, DN_MAX_BONUSLEN); 1921ea8dc4b6Seschrock bcopy(*datap, DN_BONUS(dn->dn_phys), dn->dn_phys->dn_bonuslen); 19220e8c6158Smaybee if (*datap != db->db.db_data) { 1923ea8dc4b6Seschrock zio_buf_free(*datap, DN_MAX_BONUSLEN); 19240e8c6158Smaybee arc_space_return(DN_MAX_BONUSLEN); 19250e8c6158Smaybee } 1926ea8dc4b6Seschrock db->db_data_pending = NULL; 1927c717a561Smaybee drp = &db->db_last_dirty; 1928c717a561Smaybee while (*drp != dr) 1929c717a561Smaybee drp = &(*drp)->dr_next; 1930c717a561Smaybee ASSERT((*drp)->dr_next == NULL); 1931c717a561Smaybee *drp = NULL; 1932c717a561Smaybee kmem_free(dr, sizeof (dbuf_dirty_record_t)); 1933ea8dc4b6Seschrock ASSERT(db->db_dirtycnt > 0); 1934ea8dc4b6Seschrock db->db_dirtycnt -= 1; 1935ea8dc4b6Seschrock mutex_exit(&db->db_mtx); 1936ea8dc4b6Seschrock dbuf_rele(db, (void *)(uintptr_t)txg); 1937ea8dc4b6Seschrock return; 1938ea8dc4b6Seschrock } 1939ea8dc4b6Seschrock 1940c5c6ffa0Smaybee /* 1941f82bfe17Sgw25295 * This function may have dropped the db_mtx lock allowing a dmu_sync 1942f82bfe17Sgw25295 * operation to sneak in. As a result, we need to ensure that we 1943f82bfe17Sgw25295 * don't check the dr_override_state until we have returned from 1944f82bfe17Sgw25295 * dbuf_check_blkptr. 1945f82bfe17Sgw25295 */ 1946f82bfe17Sgw25295 dbuf_check_blkptr(dn, db); 1947f82bfe17Sgw25295 1948f82bfe17Sgw25295 /* 1949c717a561Smaybee * If this buffer is in the middle of an immdiate write, 1950c717a561Smaybee * wait for the synchronous IO to complete. 1951c5c6ffa0Smaybee */ 1952c717a561Smaybee while (dr->dt.dl.dr_override_state == DR_IN_DMU_SYNC) { 1953c5c6ffa0Smaybee ASSERT(dn->dn_object != DMU_META_DNODE_OBJECT); 1954c5c6ffa0Smaybee cv_wait(&db->db_changed, &db->db_mtx); 1955c717a561Smaybee ASSERT(dr->dt.dl.dr_override_state != DR_NOT_OVERRIDDEN); 1956c5c6ffa0Smaybee } 1957c717a561Smaybee 1958c717a561Smaybee /* 1959c717a561Smaybee * If this dbuf has already been written out via an immediate write, 1960c717a561Smaybee * just complete the write by copying over the new block pointer and 1961c717a561Smaybee * updating the accounting via the write-completion functions. 1962c717a561Smaybee */ 1963c717a561Smaybee if (dr->dt.dl.dr_override_state == DR_OVERRIDDEN) { 1964c717a561Smaybee zio_t zio_fake; 1965c717a561Smaybee 1966c717a561Smaybee zio_fake.io_private = &db; 1967c717a561Smaybee zio_fake.io_error = 0; 1968c717a561Smaybee zio_fake.io_bp = db->db_blkptr; 1969c717a561Smaybee zio_fake.io_bp_orig = *db->db_blkptr; 1970c717a561Smaybee zio_fake.io_txg = txg; 1971c717a561Smaybee 1972c717a561Smaybee *db->db_blkptr = dr->dt.dl.dr_overridden_by; 1973c717a561Smaybee dr->dt.dl.dr_override_state = DR_NOT_OVERRIDDEN; 1974c717a561Smaybee db->db_data_pending = dr; 1975c717a561Smaybee dr->dr_zio = &zio_fake; 1976c717a561Smaybee mutex_exit(&db->db_mtx); 1977c717a561Smaybee 1978c717a561Smaybee if (BP_IS_OLDER(&zio_fake.io_bp_orig, txg)) 1979c717a561Smaybee dsl_dataset_block_kill(os->os_dsl_dataset, 1980c717a561Smaybee &zio_fake.io_bp_orig, dn->dn_zio, tx); 1981c717a561Smaybee 1982c717a561Smaybee dbuf_write_ready(&zio_fake, db->db_buf, db); 1983c717a561Smaybee dbuf_write_done(&zio_fake, db->db_buf, db); 1984c717a561Smaybee 1985c717a561Smaybee return; 1986c717a561Smaybee } 1987c717a561Smaybee 1988c717a561Smaybee blksz = arc_buf_size(*datap); 1989c717a561Smaybee 1990c717a561Smaybee if (dn->dn_object != DMU_META_DNODE_OBJECT) { 1991fa9e4066Sahrens /* 1992fa9e4066Sahrens * If this buffer is currently "in use" (i.e., there are 1993fa9e4066Sahrens * active holds and db_data still references it), then make 1994fa9e4066Sahrens * a copy before we start the write so that any modifications 1995fa9e4066Sahrens * from the open txg will not leak into this write. 1996fa9e4066Sahrens * 1997fa9e4066Sahrens * NOTE: this copy does not need to be made for objects only 1998c717a561Smaybee * modified in the syncing context (e.g. DNONE_DNODE blocks). 1999fa9e4066Sahrens */ 2000c717a561Smaybee if (refcount_count(&db->db_holds) > 1 && *datap == db->db_buf) { 2001c717a561Smaybee arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 2002c717a561Smaybee *datap = arc_buf_alloc(os->os_spa, blksz, db, type); 2003c717a561Smaybee bcopy(db->db.db_data, (*datap)->b_data, blksz); 2004fa9e4066Sahrens } 2005c717a561Smaybee } else { 2006fa9e4066Sahrens /* 2007fa9e4066Sahrens * Private object buffers are released here rather 2008fa9e4066Sahrens * than in dbuf_dirty() since they are only modified 2009fa9e4066Sahrens * in the syncing context and we don't want the 2010fa9e4066Sahrens * overhead of making multiple copies of the data. 2011fa9e4066Sahrens */ 2012fa9e4066Sahrens arc_release(db->db_buf, db); 2013fa9e4066Sahrens } 2014fa9e4066Sahrens 2015c717a561Smaybee ASSERT(*datap != NULL); 2016c717a561Smaybee db->db_data_pending = dr; 2017fa9e4066Sahrens 2018fa9e4066Sahrens mutex_exit(&db->db_mtx); 2019fa9e4066Sahrens 2020fa9e4066Sahrens /* 2021fa9e4066Sahrens * Allow dnode settings to override objset settings, 2022fa9e4066Sahrens * except for metadata checksums. 2023fa9e4066Sahrens */ 2024fa9e4066Sahrens if (dmu_ot[dn->dn_type].ot_metadata) { 2025fa9e4066Sahrens checksum = os->os_md_checksum; 2026fa9e4066Sahrens compress = zio_compress_select(dn->dn_compress, 2027fa9e4066Sahrens os->os_md_compress); 2028fa9e4066Sahrens } else { 2029fa9e4066Sahrens checksum = zio_checksum_select(dn->dn_checksum, 2030fa9e4066Sahrens os->os_checksum); 2031fa9e4066Sahrens compress = zio_compress_select(dn->dn_compress, 2032fa9e4066Sahrens os->os_compress); 2033fa9e4066Sahrens } 2034c717a561Smaybee 2035c717a561Smaybee dbuf_write(dr, *datap, checksum, compress, tx); 2036c717a561Smaybee 2037c717a561Smaybee ASSERT(!list_link_active(&dr->dr_dirty_node)); 2038c717a561Smaybee if (dn->dn_object == DMU_META_DNODE_OBJECT) 2039c717a561Smaybee list_insert_tail(&dn->dn_dirty_records[txg&TXG_MASK], dr); 2040c717a561Smaybee else 2041c717a561Smaybee zio_nowait(dr->dr_zio); 2042fa9e4066Sahrens } 2043c717a561Smaybee 2044c717a561Smaybee void 2045c717a561Smaybee dbuf_sync_list(list_t *list, dmu_tx_t *tx) 2046c717a561Smaybee { 2047c717a561Smaybee dbuf_dirty_record_t *dr; 2048c717a561Smaybee 2049c717a561Smaybee while (dr = list_head(list)) { 2050c717a561Smaybee if (dr->dr_zio != NULL) { 2051c717a561Smaybee /* 2052c717a561Smaybee * If we find an already initialized zio then we 2053c717a561Smaybee * are processing the meta-dnode, and we have finished. 2054c717a561Smaybee * The dbufs for all dnodes are put back on the list 2055c717a561Smaybee * during processing, so that we can zio_wait() 2056c717a561Smaybee * these IOs after initiating all child IOs. 2057c717a561Smaybee */ 2058c717a561Smaybee ASSERT3U(dr->dr_dbuf->db.db_object, ==, 2059c717a561Smaybee DMU_META_DNODE_OBJECT); 2060c717a561Smaybee break; 2061fa9e4066Sahrens } 2062c717a561Smaybee list_remove(list, dr); 2063c717a561Smaybee if (dr->dr_dbuf->db_level > 0) 2064c717a561Smaybee dbuf_sync_indirect(dr, tx); 2065c717a561Smaybee else 2066c717a561Smaybee dbuf_sync_leaf(dr, tx); 2067c717a561Smaybee } 2068c717a561Smaybee } 2069c717a561Smaybee 2070c717a561Smaybee static void 2071c717a561Smaybee dbuf_write(dbuf_dirty_record_t *dr, arc_buf_t *data, int checksum, 2072c717a561Smaybee int compress, dmu_tx_t *tx) 2073c717a561Smaybee { 2074c717a561Smaybee dmu_buf_impl_t *db = dr->dr_dbuf; 2075c717a561Smaybee dnode_t *dn = db->db_dnode; 2076c717a561Smaybee objset_impl_t *os = dn->dn_objset; 2077c717a561Smaybee dmu_buf_impl_t *parent = db->db_parent; 2078c717a561Smaybee uint64_t txg = tx->tx_txg; 2079c717a561Smaybee zbookmark_t zb; 2080c717a561Smaybee zio_t *zio; 20819bc11082Sek110237 int zio_flags; 2082c717a561Smaybee 2083c717a561Smaybee if (parent != dn->dn_dbuf) { 2084c717a561Smaybee ASSERT(parent && parent->db_data_pending); 2085c717a561Smaybee ASSERT(db->db_level == parent->db_level-1); 2086c717a561Smaybee ASSERT(arc_released(parent->db_buf)); 2087c717a561Smaybee zio = parent->db_data_pending->dr_zio; 2088c717a561Smaybee } else { 2089c717a561Smaybee ASSERT(db->db_level == dn->dn_phys->dn_nlevels-1); 2090c717a561Smaybee ASSERT3P(db->db_blkptr, ==, 2091c717a561Smaybee &dn->dn_phys->dn_blkptr[db->db_blkid]); 2092c717a561Smaybee zio = dn->dn_zio; 2093c717a561Smaybee } 2094c717a561Smaybee 2095c717a561Smaybee ASSERT(db->db_level == 0 || data == db->db_buf); 2096c717a561Smaybee ASSERT3U(db->db_blkptr->blk_birth, <=, txg); 2097c717a561Smaybee ASSERT(zio); 2098c717a561Smaybee 2099ea8dc4b6Seschrock zb.zb_objset = os->os_dsl_dataset ? os->os_dsl_dataset->ds_object : 0; 2100ea8dc4b6Seschrock zb.zb_object = db->db.db_object; 2101ea8dc4b6Seschrock zb.zb_level = db->db_level; 2102ea8dc4b6Seschrock zb.zb_blkid = db->db_blkid; 210344cd46caSbillm 21049bc11082Sek110237 zio_flags = ZIO_FLAG_MUSTSUCCEED; 21059bc11082Sek110237 if (dmu_ot[dn->dn_type].ot_metadata || zb.zb_level != 0) 21069bc11082Sek110237 zio_flags |= ZIO_FLAG_METADATA; 2107c717a561Smaybee if (BP_IS_OLDER(db->db_blkptr, txg)) 2108c717a561Smaybee dsl_dataset_block_kill( 2109c717a561Smaybee os->os_dsl_dataset, db->db_blkptr, zio, tx); 2110c717a561Smaybee 2111c717a561Smaybee dr->dr_zio = arc_write(zio, os->os_spa, checksum, compress, 2112d0ad202dSahrens dmu_get_replication_level(os, &zb, dn->dn_type), txg, 2113c717a561Smaybee db->db_blkptr, data, dbuf_write_ready, dbuf_write_done, db, 21149bc11082Sek110237 ZIO_PRIORITY_ASYNC_WRITE, zio_flags, &zb); 2115fa9e4066Sahrens } 2116fa9e4066Sahrens 2117fa9e4066Sahrens /* ARGSUSED */ 2118fa9e4066Sahrens static void 2119c717a561Smaybee dbuf_write_ready(zio_t *zio, arc_buf_t *buf, void *vdb) 2120fa9e4066Sahrens { 2121fa9e4066Sahrens dmu_buf_impl_t *db = vdb; 2122fa9e4066Sahrens dnode_t *dn = db->db_dnode; 2123fa9e4066Sahrens objset_impl_t *os = dn->dn_objset; 2124c717a561Smaybee blkptr_t *bp_orig = &zio->io_bp_orig; 2125fa9e4066Sahrens uint64_t fill = 0; 2126c717a561Smaybee int old_size, new_size, i; 2127fa9e4066Sahrens 2128c717a561Smaybee dprintf_dbuf_bp(db, bp_orig, "bp_orig: %s", ""); 2129fa9e4066Sahrens 2130c717a561Smaybee old_size = bp_get_dasize(os->os_spa, bp_orig); 213199653d4eSeschrock new_size = bp_get_dasize(os->os_spa, zio->io_bp); 2132fa9e4066Sahrens 2133fa9e4066Sahrens dnode_diduse_space(dn, new_size-old_size); 2134fa9e4066Sahrens 2135c717a561Smaybee if (BP_IS_HOLE(zio->io_bp)) { 2136c717a561Smaybee dsl_dataset_t *ds = os->os_dsl_dataset; 2137c717a561Smaybee dmu_tx_t *tx = os->os_synctx; 2138c717a561Smaybee 2139c717a561Smaybee if (bp_orig->blk_birth == tx->tx_txg) 2140c717a561Smaybee dsl_dataset_block_kill(ds, bp_orig, NULL, tx); 2141c717a561Smaybee ASSERT3U(db->db_blkptr->blk_fill, ==, 0); 2142c717a561Smaybee return; 2143c717a561Smaybee } 2144c717a561Smaybee 2145fa9e4066Sahrens mutex_enter(&db->db_mtx); 2146fa9e4066Sahrens 2147fa9e4066Sahrens if (db->db_level == 0) { 2148fa9e4066Sahrens mutex_enter(&dn->dn_mtx); 2149c717a561Smaybee if (db->db_blkid > dn->dn_phys->dn_maxblkid) 2150fa9e4066Sahrens dn->dn_phys->dn_maxblkid = db->db_blkid; 2151fa9e4066Sahrens mutex_exit(&dn->dn_mtx); 2152fa9e4066Sahrens 2153fa9e4066Sahrens if (dn->dn_type == DMU_OT_DNODE) { 2154fa9e4066Sahrens dnode_phys_t *dnp = db->db.db_data; 2155fa9e4066Sahrens for (i = db->db.db_size >> DNODE_SHIFT; i > 0; 2156fa9e4066Sahrens i--, dnp++) { 2157fa9e4066Sahrens if (dnp->dn_type != DMU_OT_NONE) 2158fa9e4066Sahrens fill++; 2159fa9e4066Sahrens } 2160fa9e4066Sahrens } else { 2161fa9e4066Sahrens fill = 1; 2162fa9e4066Sahrens } 2163fa9e4066Sahrens } else { 2164fa9e4066Sahrens blkptr_t *bp = db->db.db_data; 2165fa9e4066Sahrens ASSERT3U(db->db.db_size, ==, 1<<dn->dn_phys->dn_indblkshift); 2166fa9e4066Sahrens for (i = db->db.db_size >> SPA_BLKPTRSHIFT; i > 0; i--, bp++) { 2167fa9e4066Sahrens if (BP_IS_HOLE(bp)) 2168fa9e4066Sahrens continue; 2169fa9e4066Sahrens ASSERT3U(BP_GET_LSIZE(bp), ==, 2170fa9e4066Sahrens db->db_level == 1 ? dn->dn_datablksz : 2171fa9e4066Sahrens (1<<dn->dn_phys->dn_indblkshift)); 2172fa9e4066Sahrens fill += bp->blk_fill; 2173fa9e4066Sahrens } 2174fa9e4066Sahrens } 2175fa9e4066Sahrens 2176fa9e4066Sahrens db->db_blkptr->blk_fill = fill; 2177fa9e4066Sahrens BP_SET_TYPE(db->db_blkptr, dn->dn_type); 2178fa9e4066Sahrens BP_SET_LEVEL(db->db_blkptr, db->db_level); 2179fa9e4066Sahrens 2180fa9e4066Sahrens mutex_exit(&db->db_mtx); 2181fa9e4066Sahrens 2182fa9e4066Sahrens /* We must do this after we've set the bp's type and level */ 2183c717a561Smaybee if (!DVA_EQUAL(BP_IDENTITY(zio->io_bp), BP_IDENTITY(bp_orig))) { 2184c717a561Smaybee dsl_dataset_t *ds = os->os_dsl_dataset; 2185c717a561Smaybee dmu_tx_t *tx = os->os_synctx; 2186c717a561Smaybee 2187c717a561Smaybee if (bp_orig->blk_birth == tx->tx_txg) 2188c717a561Smaybee dsl_dataset_block_kill(ds, bp_orig, NULL, tx); 2189c717a561Smaybee dsl_dataset_block_born(ds, zio->io_bp, tx); 2190fa9e4066Sahrens } 2191fa9e4066Sahrens } 2192fa9e4066Sahrens 2193c717a561Smaybee /* ARGSUSED */ 2194c717a561Smaybee static void 2195c717a561Smaybee dbuf_write_done(zio_t *zio, arc_buf_t *buf, void *vdb) 2196c717a561Smaybee { 2197c717a561Smaybee dmu_buf_impl_t *db = vdb; 2198c717a561Smaybee uint64_t txg = zio->io_txg; 2199c717a561Smaybee dbuf_dirty_record_t **drp, *dr; 2200c717a561Smaybee 2201c717a561Smaybee ASSERT3U(zio->io_error, ==, 0); 2202c717a561Smaybee 2203c717a561Smaybee mutex_enter(&db->db_mtx); 2204c717a561Smaybee 2205c717a561Smaybee drp = &db->db_last_dirty; 2206c717a561Smaybee while (*drp != db->db_data_pending) 2207c717a561Smaybee drp = &(*drp)->dr_next; 2208c717a561Smaybee ASSERT(!list_link_active(&(*drp)->dr_dirty_node)); 2209c717a561Smaybee ASSERT((*drp)->dr_txg == txg); 2210c717a561Smaybee ASSERT((*drp)->dr_next == NULL); 2211c717a561Smaybee dr = *drp; 2212c717a561Smaybee *drp = NULL; 2213c717a561Smaybee 2214c717a561Smaybee if (db->db_level == 0) { 2215c717a561Smaybee ASSERT(db->db_blkid != DB_BONUS_BLKID); 2216c717a561Smaybee ASSERT(dr->dt.dl.dr_override_state == DR_NOT_OVERRIDDEN); 2217c717a561Smaybee 2218c717a561Smaybee if (dr->dt.dl.dr_data != db->db_buf) 2219c717a561Smaybee VERIFY(arc_buf_remove_ref(dr->dt.dl.dr_data, db) == 1); 2220c717a561Smaybee else if (!BP_IS_HOLE(db->db_blkptr)) 2221c717a561Smaybee arc_set_callback(db->db_buf, dbuf_do_evict, db); 2222c717a561Smaybee else 2223c717a561Smaybee ASSERT(arc_released(db->db_buf)); 2224c717a561Smaybee } else { 2225c717a561Smaybee dnode_t *dn = db->db_dnode; 2226c717a561Smaybee 2227c717a561Smaybee ASSERT(list_head(&dr->dt.di.dr_children) == NULL); 2228c717a561Smaybee ASSERT3U(db->db.db_size, ==, 1<<dn->dn_phys->dn_indblkshift); 2229c717a561Smaybee if (!BP_IS_HOLE(db->db_blkptr)) { 2230c717a561Smaybee int epbs = 2231c717a561Smaybee dn->dn_phys->dn_indblkshift - SPA_BLKPTRSHIFT; 2232c717a561Smaybee ASSERT3U(BP_GET_LSIZE(db->db_blkptr), ==, 2233c717a561Smaybee db->db.db_size); 2234c717a561Smaybee ASSERT3U(dn->dn_phys->dn_maxblkid 2235c717a561Smaybee >> (db->db_level * epbs), >=, db->db_blkid); 2236c717a561Smaybee arc_set_callback(db->db_buf, dbuf_do_evict, db); 2237c717a561Smaybee } 2238c25056deSgw25295 mutex_destroy(&dr->dt.di.dr_mtx); 2239c25056deSgw25295 list_destroy(&dr->dt.di.dr_children); 2240c717a561Smaybee } 2241c717a561Smaybee kmem_free(dr, sizeof (dbuf_dirty_record_t)); 2242c717a561Smaybee 2243c717a561Smaybee cv_broadcast(&db->db_changed); 2244c717a561Smaybee ASSERT(db->db_dirtycnt > 0); 2245c717a561Smaybee db->db_dirtycnt -= 1; 2246c717a561Smaybee db->db_data_pending = NULL; 2247c717a561Smaybee mutex_exit(&db->db_mtx); 2248c717a561Smaybee 2249c717a561Smaybee dprintf_dbuf_bp(db, zio->io_bp, "bp: %s", ""); 2250c717a561Smaybee 2251ea8dc4b6Seschrock dbuf_rele(db, (void *)(uintptr_t)txg); 2252fa9e4066Sahrens } 2253