1fa9e4066Sahrens /* 2fa9e4066Sahrens * CDDL HEADER START 3fa9e4066Sahrens * 4fa9e4066Sahrens * The contents of this file are subject to the terms of the 5fa9e4066Sahrens * Common Development and Distribution License, Version 1.0 only 6fa9e4066Sahrens * (the "License"). You may not use this file except in compliance 7fa9e4066Sahrens * with the License. 8fa9e4066Sahrens * 9fa9e4066Sahrens * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10fa9e4066Sahrens * or http://www.opensolaris.org/os/licensing. 11fa9e4066Sahrens * See the License for the specific language governing permissions 12fa9e4066Sahrens * and limitations under the License. 13fa9e4066Sahrens * 14fa9e4066Sahrens * When distributing Covered Code, include this CDDL HEADER in each 15fa9e4066Sahrens * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16fa9e4066Sahrens * If applicable, add the following below this CDDL HEADER, with the 17fa9e4066Sahrens * fields enclosed by brackets "[]" replaced with your own identifying 18fa9e4066Sahrens * information: Portions Copyright [yyyy] [name of copyright owner] 19fa9e4066Sahrens * 20fa9e4066Sahrens * CDDL HEADER END 21fa9e4066Sahrens */ 22fa9e4066Sahrens /* 23fa9e4066Sahrens * Copyright 2005 Sun Microsystems, Inc. All rights reserved. 24fa9e4066Sahrens * Use is subject to license terms. 25fa9e4066Sahrens */ 26fa9e4066Sahrens 27fa9e4066Sahrens #pragma ident "%Z%%M% %I% %E% SMI" 28fa9e4066Sahrens 29fa9e4066Sahrens #include <sys/zfs_context.h> 30fa9e4066Sahrens #include <sys/dmu.h> 31fa9e4066Sahrens #include <sys/dmu_impl.h> 32fa9e4066Sahrens #include <sys/dbuf.h> 33fa9e4066Sahrens #include <sys/dmu_objset.h> 34fa9e4066Sahrens #include <sys/dsl_dataset.h> 35fa9e4066Sahrens #include <sys/dsl_dir.h> 36fa9e4066Sahrens #include <sys/dmu_tx.h> 37fa9e4066Sahrens #include <sys/spa.h> 38fa9e4066Sahrens #include <sys/zio.h> 39fa9e4066Sahrens #include <sys/dmu_zfetch.h> 40fa9e4066Sahrens 41fa9e4066Sahrens static void dbuf_destroy(dmu_buf_impl_t *db); 42fa9e4066Sahrens static int dbuf_undirty(dmu_buf_impl_t *db, dmu_tx_t *tx); 43fa9e4066Sahrens static arc_done_func_t dbuf_write_done; 44fa9e4066Sahrens 45fa9e4066Sahrens /* 46fa9e4066Sahrens * Global data structures and functions for the dbuf cache. 47fa9e4066Sahrens */ 48fa9e4066Sahrens taskq_t *dbuf_tq; 49fa9e4066Sahrens static kmem_cache_t *dbuf_cache; 50fa9e4066Sahrens 51fa9e4066Sahrens /* ARGSUSED */ 52fa9e4066Sahrens static int 53fa9e4066Sahrens dbuf_cons(void *vdb, void *unused, int kmflag) 54fa9e4066Sahrens { 55fa9e4066Sahrens dmu_buf_impl_t *db = vdb; 56fa9e4066Sahrens bzero(db, sizeof (dmu_buf_impl_t)); 57fa9e4066Sahrens 58fa9e4066Sahrens mutex_init(&db->db_mtx, NULL, MUTEX_DEFAULT, NULL); 59fa9e4066Sahrens cv_init(&db->db_changed, NULL, CV_DEFAULT, NULL); 60fa9e4066Sahrens refcount_create(&db->db_holds); 61fa9e4066Sahrens return (0); 62fa9e4066Sahrens } 63fa9e4066Sahrens 64fa9e4066Sahrens /* ARGSUSED */ 65fa9e4066Sahrens static void 66fa9e4066Sahrens dbuf_dest(void *vdb, void *unused) 67fa9e4066Sahrens { 68fa9e4066Sahrens dmu_buf_impl_t *db = vdb; 69fa9e4066Sahrens mutex_destroy(&db->db_mtx); 70fa9e4066Sahrens cv_destroy(&db->db_changed); 71fa9e4066Sahrens refcount_destroy(&db->db_holds); 72fa9e4066Sahrens } 73fa9e4066Sahrens 74fa9e4066Sahrens /* 75fa9e4066Sahrens * dbuf hash table routines 76fa9e4066Sahrens */ 77fa9e4066Sahrens static dbuf_hash_table_t dbuf_hash_table; 78fa9e4066Sahrens 79fa9e4066Sahrens static uint64_t dbuf_hash_count; 80fa9e4066Sahrens 81fa9e4066Sahrens static uint64_t 82fa9e4066Sahrens dbuf_hash(void *os, uint64_t obj, uint8_t lvl, uint64_t blkid) 83fa9e4066Sahrens { 84fa9e4066Sahrens uintptr_t osv = (uintptr_t)os; 85fa9e4066Sahrens uint64_t crc = -1ULL; 86fa9e4066Sahrens 87fa9e4066Sahrens ASSERT(zfs_crc64_table[128] == ZFS_CRC64_POLY); 88fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (lvl)) & 0xFF]; 89fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (osv >> 6)) & 0xFF]; 90fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (obj >> 0)) & 0xFF]; 91fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (obj >> 8)) & 0xFF]; 92fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (blkid >> 0)) & 0xFF]; 93fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (blkid >> 8)) & 0xFF]; 94fa9e4066Sahrens 95fa9e4066Sahrens crc ^= (osv>>14) ^ (obj>>16) ^ (blkid>>16); 96fa9e4066Sahrens 97fa9e4066Sahrens return (crc); 98fa9e4066Sahrens } 99fa9e4066Sahrens 100fa9e4066Sahrens #define DBUF_HASH(os, obj, level, blkid) dbuf_hash(os, obj, level, blkid); 101fa9e4066Sahrens 102fa9e4066Sahrens #define DBUF_EQUAL(dbuf, os, obj, level, blkid) \ 103fa9e4066Sahrens ((dbuf)->db.db_object == (obj) && \ 104fa9e4066Sahrens (dbuf)->db_objset == (os) && \ 105fa9e4066Sahrens (dbuf)->db_level == (level) && \ 106fa9e4066Sahrens (dbuf)->db_blkid == (blkid)) 107fa9e4066Sahrens 108fa9e4066Sahrens dmu_buf_impl_t * 109fa9e4066Sahrens dbuf_find(dnode_t *dn, uint8_t level, uint64_t blkid) 110fa9e4066Sahrens { 111fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 112fa9e4066Sahrens objset_impl_t *os = dn->dn_objset; 113fa9e4066Sahrens uint64_t obj = dn->dn_object; 114fa9e4066Sahrens uint64_t hv = DBUF_HASH(os, obj, level, blkid); 115fa9e4066Sahrens uint64_t idx = hv & h->hash_table_mask; 116fa9e4066Sahrens dmu_buf_impl_t *db; 117fa9e4066Sahrens 118fa9e4066Sahrens mutex_enter(DBUF_HASH_MUTEX(h, idx)); 119fa9e4066Sahrens for (db = h->hash_table[idx]; db != NULL; db = db->db_hash_next) { 120fa9e4066Sahrens if (DBUF_EQUAL(db, os, obj, level, blkid)) { 121fa9e4066Sahrens mutex_enter(&db->db_mtx); 122fa9e4066Sahrens if (!refcount_is_zero(&db->db_holds)) { 123fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 124fa9e4066Sahrens return (db); 125fa9e4066Sahrens } 126fa9e4066Sahrens mutex_exit(&db->db_mtx); 127fa9e4066Sahrens } 128fa9e4066Sahrens } 129fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 130fa9e4066Sahrens return (NULL); 131fa9e4066Sahrens } 132fa9e4066Sahrens 133fa9e4066Sahrens /* 134fa9e4066Sahrens * Insert an entry into the hash table. If there is already an element 135fa9e4066Sahrens * equal to elem in the hash table, then the already existing element 136fa9e4066Sahrens * will be returned and the new element will not be inserted. 137fa9e4066Sahrens * Otherwise returns NULL. 138fa9e4066Sahrens */ 139fa9e4066Sahrens static dmu_buf_impl_t * 140fa9e4066Sahrens dbuf_hash_insert(dmu_buf_impl_t *db) 141fa9e4066Sahrens { 142fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 143fa9e4066Sahrens objset_impl_t *os = db->db_objset; 144fa9e4066Sahrens uint64_t obj = db->db.db_object; 145fa9e4066Sahrens int level = db->db_level; 146fa9e4066Sahrens uint64_t blkid = db->db_blkid; 147fa9e4066Sahrens uint64_t hv = DBUF_HASH(os, obj, level, blkid); 148fa9e4066Sahrens uint64_t idx = hv & h->hash_table_mask; 149fa9e4066Sahrens dmu_buf_impl_t *dbf; 150fa9e4066Sahrens 151fa9e4066Sahrens mutex_enter(DBUF_HASH_MUTEX(h, idx)); 152fa9e4066Sahrens for (dbf = h->hash_table[idx]; dbf != NULL; dbf = dbf->db_hash_next) { 153fa9e4066Sahrens if (DBUF_EQUAL(dbf, os, obj, level, blkid)) { 154fa9e4066Sahrens mutex_enter(&dbf->db_mtx); 155fa9e4066Sahrens if (!refcount_is_zero(&dbf->db_holds)) { 156fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 157fa9e4066Sahrens return (dbf); 158fa9e4066Sahrens } 159fa9e4066Sahrens mutex_exit(&dbf->db_mtx); 160fa9e4066Sahrens } 161fa9e4066Sahrens } 162fa9e4066Sahrens 163fa9e4066Sahrens mutex_enter(&db->db_mtx); 164fa9e4066Sahrens db->db_hash_next = h->hash_table[idx]; 165fa9e4066Sahrens h->hash_table[idx] = db; 166fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 167fa9e4066Sahrens atomic_add_64(&dbuf_hash_count, 1); 168fa9e4066Sahrens 169fa9e4066Sahrens return (NULL); 170fa9e4066Sahrens } 171fa9e4066Sahrens 172fa9e4066Sahrens /* 173fa9e4066Sahrens * Remove an entry from the hash table. This operation will 174fa9e4066Sahrens * fail if there are any existing holds on the db. 175fa9e4066Sahrens */ 176fa9e4066Sahrens static void 177fa9e4066Sahrens dbuf_hash_remove(dmu_buf_impl_t *db) 178fa9e4066Sahrens { 179fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 180fa9e4066Sahrens uint64_t hv = DBUF_HASH(db->db_objset, db->db.db_object, 181fa9e4066Sahrens db->db_level, db->db_blkid); 182fa9e4066Sahrens uint64_t idx = hv & h->hash_table_mask; 183fa9e4066Sahrens dmu_buf_impl_t *dbf, **dbp; 184fa9e4066Sahrens 185fa9e4066Sahrens /* 186fa9e4066Sahrens * We musn't hold db_mtx to maintin lock ordering: 187fa9e4066Sahrens * DBUF_HASH_MUTEX > db_mtx. 188fa9e4066Sahrens */ 189fa9e4066Sahrens ASSERT(refcount_is_zero(&db->db_holds)); 190fa9e4066Sahrens ASSERT(db->db_dnode != NULL); 191fa9e4066Sahrens ASSERT(!MUTEX_HELD(&db->db_mtx)); 192fa9e4066Sahrens 193fa9e4066Sahrens mutex_enter(DBUF_HASH_MUTEX(h, idx)); 194fa9e4066Sahrens dbp = &h->hash_table[idx]; 195fa9e4066Sahrens while ((dbf = *dbp) != db) { 196fa9e4066Sahrens dbp = &dbf->db_hash_next; 197fa9e4066Sahrens ASSERT(dbf != NULL); 198fa9e4066Sahrens } 199fa9e4066Sahrens *dbp = db->db_hash_next; 200fa9e4066Sahrens db->db_hash_next = NULL; 201fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 202fa9e4066Sahrens atomic_add_64(&dbuf_hash_count, -1); 203fa9e4066Sahrens } 204fa9e4066Sahrens 205fa9e4066Sahrens static int dbuf_evictable(dmu_buf_impl_t *db); 206fa9e4066Sahrens static void dbuf_clear(dmu_buf_impl_t *db); 207fa9e4066Sahrens 208fa9e4066Sahrens void 209fa9e4066Sahrens dbuf_evict(dmu_buf_impl_t *db) 210fa9e4066Sahrens { 211fa9e4066Sahrens int err; 212fa9e4066Sahrens 213fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 214fa9e4066Sahrens err = dbuf_evictable(db); 215fa9e4066Sahrens ASSERT(err == TRUE); 216fa9e4066Sahrens dbuf_clear(db); 217fa9e4066Sahrens dbuf_destroy(db); 218fa9e4066Sahrens } 219fa9e4066Sahrens 220fa9e4066Sahrens static void 221fa9e4066Sahrens dbuf_evict_user(dmu_buf_impl_t *db) 222fa9e4066Sahrens { 223fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 224fa9e4066Sahrens 225fa9e4066Sahrens if (db->db_level != 0 || db->db_d.db_evict_func == NULL) 226fa9e4066Sahrens return; 227fa9e4066Sahrens 228fa9e4066Sahrens if (db->db_d.db_user_data_ptr_ptr) 229fa9e4066Sahrens *db->db_d.db_user_data_ptr_ptr = db->db.db_data; 230fa9e4066Sahrens db->db_d.db_evict_func(&db->db, db->db_d.db_user_ptr); 231fa9e4066Sahrens db->db_d.db_user_ptr = NULL; 232fa9e4066Sahrens db->db_d.db_user_data_ptr_ptr = NULL; 233fa9e4066Sahrens db->db_d.db_evict_func = NULL; 234fa9e4066Sahrens } 235fa9e4066Sahrens 236fa9e4066Sahrens void 237fa9e4066Sahrens dbuf_init(void) 238fa9e4066Sahrens { 239fa9e4066Sahrens uint64_t hsize = 1; 240fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 241fa9e4066Sahrens int i; 242fa9e4066Sahrens 243fa9e4066Sahrens /* 244fa9e4066Sahrens * The hash table is big enough to fill all of physical memory 245fa9e4066Sahrens * with an average 64k block size. The table will take up 246fa9e4066Sahrens * totalmem*sizeof(void*)/64k bytes (i.e. 128KB/GB with 8-byte 247fa9e4066Sahrens * pointers). 248fa9e4066Sahrens */ 249fa9e4066Sahrens while (hsize * 65536 < physmem * PAGESIZE) 250fa9e4066Sahrens hsize <<= 1; 251fa9e4066Sahrens 252fa9e4066Sahrens h->hash_table_mask = hsize - 1; 253fa9e4066Sahrens h->hash_table = kmem_zalloc(hsize * sizeof (void *), KM_SLEEP); 254fa9e4066Sahrens 255fa9e4066Sahrens dbuf_cache = kmem_cache_create("dmu_buf_impl_t", 256fa9e4066Sahrens sizeof (dmu_buf_impl_t), 257fa9e4066Sahrens 0, dbuf_cons, dbuf_dest, NULL, NULL, NULL, 0); 258fa9e4066Sahrens dbuf_tq = taskq_create("dbuf_tq", 8, maxclsyspri, 50, INT_MAX, 259fa9e4066Sahrens TASKQ_PREPOPULATE); 260fa9e4066Sahrens 261fa9e4066Sahrens for (i = 0; i < DBUF_MUTEXES; i++) 262fa9e4066Sahrens mutex_init(&h->hash_mutexes[i], NULL, MUTEX_DEFAULT, NULL); 263fa9e4066Sahrens } 264fa9e4066Sahrens 265fa9e4066Sahrens void 266fa9e4066Sahrens dbuf_fini(void) 267fa9e4066Sahrens { 268fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 269fa9e4066Sahrens int i; 270fa9e4066Sahrens 271fa9e4066Sahrens taskq_destroy(dbuf_tq); 272fa9e4066Sahrens dbuf_tq = NULL; 273fa9e4066Sahrens 274fa9e4066Sahrens for (i = 0; i < DBUF_MUTEXES; i++) 275fa9e4066Sahrens mutex_destroy(&h->hash_mutexes[i]); 276fa9e4066Sahrens kmem_free(h->hash_table, (h->hash_table_mask + 1) * sizeof (void *)); 277fa9e4066Sahrens kmem_cache_destroy(dbuf_cache); 278fa9e4066Sahrens } 279fa9e4066Sahrens 280fa9e4066Sahrens /* 281fa9e4066Sahrens * Other stuff. 282fa9e4066Sahrens */ 283fa9e4066Sahrens 284*9c9dc39aSek #ifdef ZFS_DEBUG 285fa9e4066Sahrens static void 286fa9e4066Sahrens dbuf_verify(dmu_buf_impl_t *db) 287fa9e4066Sahrens { 288fa9e4066Sahrens int i; 289fa9e4066Sahrens dnode_t *dn = db->db_dnode; 290fa9e4066Sahrens 291fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 292fa9e4066Sahrens 293fa9e4066Sahrens if (!(zfs_flags & ZFS_DEBUG_DBUF_VERIFY)) 294fa9e4066Sahrens return; 295fa9e4066Sahrens 296fa9e4066Sahrens ASSERT(db->db_objset != NULL); 297fa9e4066Sahrens if (dn == NULL) { 298fa9e4066Sahrens ASSERT(db->db_parent == NULL); 299fa9e4066Sahrens ASSERT(db->db_blkptr == NULL); 300fa9e4066Sahrens } else { 301fa9e4066Sahrens ASSERT3U(db->db.db_object, ==, dn->dn_object); 302fa9e4066Sahrens ASSERT3P(db->db_objset, ==, dn->dn_objset); 303fa9e4066Sahrens ASSERT(list_head(&dn->dn_dbufs)); 304fa9e4066Sahrens ASSERT3U(db->db_level, <, dn->dn_nlevels); 305fa9e4066Sahrens } 306fa9e4066Sahrens if (db->db_blkid == DB_BONUS_BLKID) { 307fa9e4066Sahrens ASSERT(dn != NULL); 308fa9e4066Sahrens ASSERT3U(db->db.db_size, ==, dn->dn_bonuslen); 309fa9e4066Sahrens ASSERT3U(db->db.db_offset, ==, DB_BONUS_BLKID); 310fa9e4066Sahrens } else { 311fa9e4066Sahrens ASSERT3U(db->db.db_offset, ==, db->db_blkid * db->db.db_size); 312fa9e4066Sahrens } 313fa9e4066Sahrens 314fa9e4066Sahrens if (db->db_level == 0) { 315fa9e4066Sahrens void **udpp = db->db_d.db_user_data_ptr_ptr; 316fa9e4066Sahrens /* we can be momentarily larger in dnode_set_blksz() */ 317fa9e4066Sahrens if (db->db_blkid != DB_BONUS_BLKID && dn) { 318fa9e4066Sahrens ASSERT3U(db->db.db_size, >=, dn->dn_datablksz); 319fa9e4066Sahrens } 320fa9e4066Sahrens if (udpp) { 321fa9e4066Sahrens ASSERT((refcount_is_zero(&db->db_holds) && 322fa9e4066Sahrens *udpp == NULL) || 323fa9e4066Sahrens (!refcount_is_zero(&db->db_holds) && 324fa9e4066Sahrens *udpp == db->db.db_data)); 325fa9e4066Sahrens } 326fa9e4066Sahrens 327fa9e4066Sahrens if (IS_DNODE_DNODE(db->db.db_object)) { 328fa9e4066Sahrens for (i = 0; i < TXG_SIZE; i++) { 329fa9e4066Sahrens /* 330fa9e4066Sahrens * it should only be modified in syncing 331fa9e4066Sahrens * context, so make sure we only have 332fa9e4066Sahrens * one copy of the data. 333fa9e4066Sahrens */ 334fa9e4066Sahrens ASSERT(db->db_d.db_data_old[i] == NULL || 335fa9e4066Sahrens db->db_d.db_data_old[i] == db->db_buf); 336fa9e4066Sahrens } 337fa9e4066Sahrens } 338fa9e4066Sahrens } 339fa9e4066Sahrens 340fa9e4066Sahrens /* verify db->db_blkptr */ 341fa9e4066Sahrens if (db->db_blkptr) { 342fa9e4066Sahrens if (db->db_parent == dn->dn_dbuf) { 343fa9e4066Sahrens /* db is pointed to by the dnode */ 344fa9e4066Sahrens /* ASSERT3U(db->db_blkid, <, dn->dn_nblkptr); */ 345fa9e4066Sahrens if (IS_DNODE_DNODE(db->db.db_object)) 346fa9e4066Sahrens ASSERT(db->db_parent == NULL); 347fa9e4066Sahrens else 348fa9e4066Sahrens ASSERT(db->db_parent != NULL); 349fa9e4066Sahrens ASSERT3P(db->db_blkptr, ==, 350fa9e4066Sahrens &dn->dn_phys->dn_blkptr[db->db_blkid]); 351fa9e4066Sahrens } else { 352fa9e4066Sahrens /* db is pointed to by an indirect block */ 353fa9e4066Sahrens int epb = db->db_parent->db.db_size >> SPA_BLKPTRSHIFT; 354fa9e4066Sahrens ASSERT3U(db->db_parent->db_level, ==, db->db_level+1); 355fa9e4066Sahrens ASSERT3U(db->db_parent->db.db_object, ==, 356fa9e4066Sahrens db->db.db_object); 357fa9e4066Sahrens /* 358fa9e4066Sahrens * dnode_grow_indblksz() can make this fail if we don't 359fa9e4066Sahrens * have the struct_rwlock. XXX indblksz no longer 360fa9e4066Sahrens * grows. safe to do this now? 361fa9e4066Sahrens */ 362fa9e4066Sahrens if (RW_WRITE_HELD(&db->db_dnode->dn_struct_rwlock)) { 363fa9e4066Sahrens ASSERT3P(db->db_blkptr, ==, 364fa9e4066Sahrens ((blkptr_t *)db->db_parent->db.db_data + 365fa9e4066Sahrens db->db_blkid % epb)); 366fa9e4066Sahrens } 367fa9e4066Sahrens } 368fa9e4066Sahrens } 369fa9e4066Sahrens if ((db->db_blkptr == NULL || BP_IS_HOLE(db->db_blkptr)) && 370fa9e4066Sahrens db->db.db_data && db->db_blkid != DB_BONUS_BLKID && 371fa9e4066Sahrens db->db_state != DB_FILL && !dn->dn_free_txg) { 372fa9e4066Sahrens /* 373fa9e4066Sahrens * If the blkptr isn't set but they have nonzero data, 374fa9e4066Sahrens * it had better be dirty, otherwise we'll lose that 375fa9e4066Sahrens * data when we evict this buffer. 376fa9e4066Sahrens */ 377fa9e4066Sahrens if (db->db_dirtycnt == 0) { 378fa9e4066Sahrens uint64_t *buf = db->db.db_data; 379fa9e4066Sahrens int i; 380fa9e4066Sahrens 381fa9e4066Sahrens for (i = 0; i < db->db.db_size >> 3; i++) { 382fa9e4066Sahrens ASSERT(buf[i] == 0); 383fa9e4066Sahrens } 384fa9e4066Sahrens } 385fa9e4066Sahrens } 386fa9e4066Sahrens } 387*9c9dc39aSek #endif 388fa9e4066Sahrens 389fa9e4066Sahrens static void 390fa9e4066Sahrens dbuf_update_data(dmu_buf_impl_t *db) 391fa9e4066Sahrens { 392fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 393fa9e4066Sahrens if (db->db_level == 0 && db->db_d.db_user_data_ptr_ptr) { 394fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 395fa9e4066Sahrens *db->db_d.db_user_data_ptr_ptr = db->db.db_data; 396fa9e4066Sahrens } 397fa9e4066Sahrens } 398fa9e4066Sahrens 399fa9e4066Sahrens static void 400fa9e4066Sahrens dbuf_set_data(dmu_buf_impl_t *db, arc_buf_t *buf) 401fa9e4066Sahrens { 402fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 403fa9e4066Sahrens ASSERT(buf->b_data != NULL); 404fa9e4066Sahrens db->db_buf = buf; 405fa9e4066Sahrens db->db.db_data = buf->b_data; 406fa9e4066Sahrens dbuf_update_data(db); 407fa9e4066Sahrens } 408fa9e4066Sahrens 409fa9e4066Sahrens uint64_t 410fa9e4066Sahrens dbuf_whichblock(dnode_t *dn, uint64_t offset) 411fa9e4066Sahrens { 412fa9e4066Sahrens if (dn->dn_datablkshift) { 413fa9e4066Sahrens return (offset >> dn->dn_datablkshift); 414fa9e4066Sahrens } else { 415fa9e4066Sahrens ASSERT3U(offset, <, dn->dn_datablksz); 416fa9e4066Sahrens return (0); 417fa9e4066Sahrens } 418fa9e4066Sahrens } 419fa9e4066Sahrens 420fa9e4066Sahrens static void 421fa9e4066Sahrens dbuf_read_done(zio_t *zio, arc_buf_t *buf, void *vdb) 422fa9e4066Sahrens { 423fa9e4066Sahrens dmu_buf_impl_t *db = vdb; 424fa9e4066Sahrens 425fa9e4066Sahrens mutex_enter(&db->db_mtx); 426fa9e4066Sahrens ASSERT3U(db->db_state, ==, DB_READ); 427fa9e4066Sahrens /* 428fa9e4066Sahrens * All reads are synchronous, so we must have a hold on the dbuf 429fa9e4066Sahrens */ 430fa9e4066Sahrens ASSERT(refcount_count(&db->db_holds) > 0); 431fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 432fa9e4066Sahrens if (db->db_level == 0 && db->db_d.db_freed_in_flight) { 433fa9e4066Sahrens /* we were freed in flight; disregard any error */ 434fa9e4066Sahrens arc_release(buf, db); 435fa9e4066Sahrens bzero(buf->b_data, db->db.db_size); 436fa9e4066Sahrens db->db_d.db_freed_in_flight = FALSE; 437fa9e4066Sahrens dbuf_set_data(db, buf); 438fa9e4066Sahrens db->db_state = DB_CACHED; 439fa9e4066Sahrens } else if (zio == NULL || zio->io_error == 0) { 440fa9e4066Sahrens dbuf_set_data(db, buf); 441fa9e4066Sahrens db->db_state = DB_CACHED; 442fa9e4066Sahrens } else { 443fa9e4066Sahrens ASSERT(db->db_blkid != DB_BONUS_BLKID); 444fa9e4066Sahrens arc_buf_free(buf, db); 445fa9e4066Sahrens db->db_state = DB_UNCACHED; 446fa9e4066Sahrens ASSERT3P(db->db_buf, ==, NULL); 447fa9e4066Sahrens } 448fa9e4066Sahrens cv_broadcast(&db->db_changed); 449fa9e4066Sahrens mutex_exit(&db->db_mtx); 450fa9e4066Sahrens } 451fa9e4066Sahrens 452fa9e4066Sahrens void 453fa9e4066Sahrens dbuf_read_impl(dmu_buf_impl_t *db, zio_t *zio, uint32_t flags) 454fa9e4066Sahrens { 455fa9e4066Sahrens arc_buf_t *buf; 456fa9e4066Sahrens blkptr_t *bp; 457fa9e4066Sahrens 458fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 459fa9e4066Sahrens /* We need the struct_rwlock to prevent db_blkptr from changing. */ 460fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&db->db_dnode->dn_struct_rwlock)); 461fa9e4066Sahrens 462fa9e4066Sahrens /* 463fa9e4066Sahrens * prefetch only data blocks (level 0) -- don't prefetch indirect 464fa9e4066Sahrens * blocks 465fa9e4066Sahrens */ 466fa9e4066Sahrens if ((db->db_level > 0) || (db->db_blkid == DB_BONUS_BLKID)) { 467fa9e4066Sahrens flags |= DB_RF_NOPREFETCH; 468fa9e4066Sahrens } 469fa9e4066Sahrens 470fa9e4066Sahrens if (((flags & DB_RF_NOPREFETCH) == 0) && (db->db_dnode != NULL)) { 471fa9e4066Sahrens dmu_zfetch(&db->db_dnode->dn_zfetch, db->db.db_offset, 472fa9e4066Sahrens db->db.db_size); 473fa9e4066Sahrens } 474fa9e4066Sahrens 475fa9e4066Sahrens if (db->db_state == DB_CACHED) { 476fa9e4066Sahrens ASSERT(db->db.db_data != NULL); 477fa9e4066Sahrens return; 478fa9e4066Sahrens } 479fa9e4066Sahrens 480fa9e4066Sahrens mutex_enter(&db->db_mtx); 481fa9e4066Sahrens 482fa9e4066Sahrens if (db->db_state != DB_UNCACHED) { 483fa9e4066Sahrens mutex_exit(&db->db_mtx); 484fa9e4066Sahrens return; 485fa9e4066Sahrens } 486fa9e4066Sahrens 487fa9e4066Sahrens ASSERT3U(db->db_state, ==, DB_UNCACHED); 488fa9e4066Sahrens 489fa9e4066Sahrens if (db->db_blkid == DB_BONUS_BLKID) { 490fa9e4066Sahrens ASSERT3U(db->db_dnode->dn_bonuslen, ==, db->db.db_size); 491fa9e4066Sahrens buf = arc_buf_alloc(db->db_dnode->dn_objset->os_spa, 492fa9e4066Sahrens DN_MAX_BONUSLEN, db); 493fa9e4066Sahrens if (db->db.db_size < DN_MAX_BONUSLEN) 494fa9e4066Sahrens bzero(buf->b_data, DN_MAX_BONUSLEN); 495fa9e4066Sahrens bcopy(DN_BONUS(db->db_dnode->dn_phys), buf->b_data, 496fa9e4066Sahrens db->db.db_size); 497fa9e4066Sahrens dbuf_set_data(db, buf); 498fa9e4066Sahrens db->db_state = DB_CACHED; 499fa9e4066Sahrens mutex_exit(&db->db_mtx); 500fa9e4066Sahrens return; 501fa9e4066Sahrens } 502fa9e4066Sahrens 503fa9e4066Sahrens if (db->db_level == 0 && dnode_block_freed(db->db_dnode, db->db_blkid)) 504fa9e4066Sahrens bp = NULL; 505fa9e4066Sahrens else 506fa9e4066Sahrens bp = db->db_blkptr; 507fa9e4066Sahrens 508fa9e4066Sahrens if (bp == NULL) 509fa9e4066Sahrens dprintf_dbuf(db, "blkptr: %s\n", "NULL"); 510fa9e4066Sahrens else 511fa9e4066Sahrens dprintf_dbuf_bp(db, bp, "%s", "blkptr:"); 512fa9e4066Sahrens 513fa9e4066Sahrens if (bp == NULL || BP_IS_HOLE(bp)) { 514fa9e4066Sahrens ASSERT(bp == NULL || BP_IS_HOLE(bp)); 515fa9e4066Sahrens dbuf_set_data(db, arc_buf_alloc(db->db_dnode->dn_objset->os_spa, 516fa9e4066Sahrens db->db.db_size, db)); 517fa9e4066Sahrens bzero(db->db.db_data, db->db.db_size); 518fa9e4066Sahrens db->db_state = DB_CACHED; 519fa9e4066Sahrens mutex_exit(&db->db_mtx); 520fa9e4066Sahrens return; 521fa9e4066Sahrens } 522fa9e4066Sahrens 523fa9e4066Sahrens db->db_state = DB_READ; 524fa9e4066Sahrens mutex_exit(&db->db_mtx); 525fa9e4066Sahrens 526fa9e4066Sahrens /* ZIO_FLAG_CANFAIL callers have to check the parent zio's error */ 527fa9e4066Sahrens (void) arc_read(zio, db->db_dnode->dn_objset->os_spa, bp, 528fa9e4066Sahrens db->db_level > 0 ? byteswap_uint64_array : 529fa9e4066Sahrens dmu_ot[db->db_dnode->dn_type].ot_byteswap, 530fa9e4066Sahrens dbuf_read_done, db, ZIO_PRIORITY_SYNC_READ, 531fa9e4066Sahrens (flags & DB_RF_CANFAIL) ? ZIO_FLAG_CANFAIL : ZIO_FLAG_MUSTSUCCEED, 532fa9e4066Sahrens ARC_NOWAIT); 533fa9e4066Sahrens } 534fa9e4066Sahrens 535fa9e4066Sahrens static int 536fa9e4066Sahrens dbuf_read_generic(dmu_buf_impl_t *db, uint32_t flags) 537fa9e4066Sahrens { 538fa9e4066Sahrens zio_t *zio; 539fa9e4066Sahrens int err; 540fa9e4066Sahrens 541fa9e4066Sahrens /* 542fa9e4066Sahrens * We don't have to hold the mutex to check db_state because it 543fa9e4066Sahrens * can't be freed while we have a hold on the buffer. 544fa9e4066Sahrens */ 545fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 546fa9e4066Sahrens if (db->db_state == DB_CACHED) 547fa9e4066Sahrens return (0); 548fa9e4066Sahrens 549fa9e4066Sahrens if (db->db_state == DB_UNCACHED) { 550fa9e4066Sahrens zio = zio_root(db->db_dnode->dn_objset->os_spa, NULL, NULL, 551fa9e4066Sahrens ZIO_FLAG_CANFAIL); 552fa9e4066Sahrens if ((flags & DB_RF_HAVESTRUCT) == 0) 553fa9e4066Sahrens rw_enter(&db->db_dnode->dn_struct_rwlock, RW_READER); 554fa9e4066Sahrens dbuf_read_impl(db, zio, flags); 555fa9e4066Sahrens if ((flags & DB_RF_HAVESTRUCT) == 0) 556fa9e4066Sahrens rw_exit(&db->db_dnode->dn_struct_rwlock); 557fa9e4066Sahrens err = zio_wait(zio); 558fa9e4066Sahrens if (err) 559fa9e4066Sahrens return (err); 560fa9e4066Sahrens } 561fa9e4066Sahrens 562fa9e4066Sahrens mutex_enter(&db->db_mtx); 563fa9e4066Sahrens while (db->db_state == DB_READ || db->db_state == DB_FILL) { 564fa9e4066Sahrens ASSERT(db->db_state == DB_READ || 565fa9e4066Sahrens (flags & DB_RF_HAVESTRUCT) == 0); 566fa9e4066Sahrens cv_wait(&db->db_changed, &db->db_mtx); 567fa9e4066Sahrens } 568fa9e4066Sahrens ASSERT3U(db->db_state, ==, DB_CACHED); 569fa9e4066Sahrens mutex_exit(&db->db_mtx); 570fa9e4066Sahrens 571fa9e4066Sahrens return (0); 572fa9e4066Sahrens } 573fa9e4066Sahrens 574fa9e4066Sahrens #pragma weak dmu_buf_read = dbuf_read 575fa9e4066Sahrens void 576fa9e4066Sahrens dbuf_read(dmu_buf_impl_t *db) 577fa9e4066Sahrens { 578fa9e4066Sahrens int err; 579fa9e4066Sahrens 580fa9e4066Sahrens err = dbuf_read_generic(db, DB_RF_MUST_SUCCEED); 581fa9e4066Sahrens ASSERT(err == 0); 582fa9e4066Sahrens } 583fa9e4066Sahrens 584fa9e4066Sahrens #pragma weak dmu_buf_read_canfail = dbuf_read_canfail 585fa9e4066Sahrens int 586fa9e4066Sahrens dbuf_read_canfail(dmu_buf_impl_t *db) 587fa9e4066Sahrens { 588fa9e4066Sahrens return (dbuf_read_generic(db, DB_RF_CANFAIL)); 589fa9e4066Sahrens } 590fa9e4066Sahrens 591fa9e4066Sahrens void 592fa9e4066Sahrens dbuf_read_havestruct(dmu_buf_impl_t *db) 593fa9e4066Sahrens { 594fa9e4066Sahrens int err; 595fa9e4066Sahrens 596fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&db->db_dnode->dn_struct_rwlock)); 597fa9e4066Sahrens err = dbuf_read_generic(db, (DB_RF_HAVESTRUCT | DB_RF_NOPREFETCH)); 598fa9e4066Sahrens ASSERT(err == 0); 599fa9e4066Sahrens } 600fa9e4066Sahrens 601fa9e4066Sahrens static void 602fa9e4066Sahrens dbuf_noread(dmu_buf_impl_t *db) 603fa9e4066Sahrens { 604fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 605fa9e4066Sahrens mutex_enter(&db->db_mtx); 606fa9e4066Sahrens while (db->db_state == DB_READ || db->db_state == DB_FILL) 607fa9e4066Sahrens cv_wait(&db->db_changed, &db->db_mtx); 608fa9e4066Sahrens if (db->db_state == DB_UNCACHED) { 609fa9e4066Sahrens int blksz = (db->db_blkid == DB_BONUS_BLKID) ? 610fa9e4066Sahrens DN_MAX_BONUSLEN : db->db.db_size; 611fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 612fa9e4066Sahrens dbuf_set_data(db, arc_buf_alloc(db->db_dnode->dn_objset->os_spa, 613fa9e4066Sahrens blksz, db)); 614fa9e4066Sahrens db->db_state = DB_FILL; 615fa9e4066Sahrens } else { 616fa9e4066Sahrens ASSERT3U(db->db_state, ==, DB_CACHED); 617fa9e4066Sahrens } 618fa9e4066Sahrens mutex_exit(&db->db_mtx); 619fa9e4066Sahrens } 620fa9e4066Sahrens 621fa9e4066Sahrens /* 622fa9e4066Sahrens * This is our just-in-time copy function. It makes a copy of 623fa9e4066Sahrens * buffers, that have been modified in a previous transaction 624fa9e4066Sahrens * group, before we modify them in the current active group. 625fa9e4066Sahrens * 626fa9e4066Sahrens * This function is used in two places: when we are dirtying a 627fa9e4066Sahrens * buffer for the first time in a txg, and when we are freeing 628fa9e4066Sahrens * a range in a dnode that includes this buffer. 629fa9e4066Sahrens * 630fa9e4066Sahrens * Note that when we are called from dbuf_free_range() we do 631fa9e4066Sahrens * not put a hold on the buffer, we just traverse the active 632fa9e4066Sahrens * dbuf list for the dnode. 633fa9e4066Sahrens */ 634fa9e4066Sahrens static void 635fa9e4066Sahrens dbuf_fix_old_data(dmu_buf_impl_t *db, uint64_t txg) 636fa9e4066Sahrens { 637fa9e4066Sahrens arc_buf_t **quiescing, **syncing; 638fa9e4066Sahrens int size = (db->db_blkid == DB_BONUS_BLKID) ? 639fa9e4066Sahrens DN_MAX_BONUSLEN : db->db.db_size; 640fa9e4066Sahrens 641fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 642fa9e4066Sahrens ASSERT(db->db.db_data != NULL); 643fa9e4066Sahrens 644fa9e4066Sahrens quiescing = &db->db_d.db_data_old[(txg-1)&TXG_MASK]; 645fa9e4066Sahrens syncing = &db->db_d.db_data_old[(txg-2)&TXG_MASK]; 646fa9e4066Sahrens 647fa9e4066Sahrens /* 648fa9e4066Sahrens * If this buffer is referenced from the current quiescing 649fa9e4066Sahrens * transaction group: either make a copy and reset the reference 650fa9e4066Sahrens * to point to the copy, or (if there a no active holders) just 651fa9e4066Sahrens * null out the current db_data pointer. 652fa9e4066Sahrens */ 653fa9e4066Sahrens if (*quiescing == db->db_buf) { 654fa9e4066Sahrens /* 655fa9e4066Sahrens * If the quiescing txg is "dirty", then we better not 656fa9e4066Sahrens * be referencing the same buffer from the syncing txg. 657fa9e4066Sahrens */ 658fa9e4066Sahrens ASSERT(*syncing != db->db_buf); 659fa9e4066Sahrens if (refcount_count(&db->db_holds) > db->db_dirtycnt) { 660fa9e4066Sahrens *quiescing = arc_buf_alloc( 661fa9e4066Sahrens db->db_dnode->dn_objset->os_spa, size, db); 662fa9e4066Sahrens bcopy(db->db.db_data, (*quiescing)->b_data, size); 663fa9e4066Sahrens } else { 664fa9e4066Sahrens db->db.db_data = NULL; 665fa9e4066Sahrens db->db_buf = NULL; 666fa9e4066Sahrens db->db_state = DB_UNCACHED; 667fa9e4066Sahrens } 668fa9e4066Sahrens return; 669fa9e4066Sahrens } 670fa9e4066Sahrens 671fa9e4066Sahrens /* 672fa9e4066Sahrens * If this buffer is referenced from the current syncing 673fa9e4066Sahrens * transaction group: either 674fa9e4066Sahrens * 1 - make a copy and reset the reference, or 675fa9e4066Sahrens * 2 - if there are no holders, just null the current db_data. 676fa9e4066Sahrens */ 677fa9e4066Sahrens if (*syncing == db->db_buf) { 678fa9e4066Sahrens ASSERT3P(*quiescing, ==, NULL); 679fa9e4066Sahrens ASSERT3U(db->db_dirtycnt, ==, 1); 680fa9e4066Sahrens if (refcount_count(&db->db_holds) > db->db_dirtycnt) { 681fa9e4066Sahrens /* we can't copy if we have already started a write */ 682fa9e4066Sahrens ASSERT(*syncing != db->db_data_pending); 683fa9e4066Sahrens *syncing = arc_buf_alloc( 684fa9e4066Sahrens db->db_dnode->dn_objset->os_spa, size, db); 685fa9e4066Sahrens bcopy(db->db.db_data, (*syncing)->b_data, size); 686fa9e4066Sahrens } else { 687fa9e4066Sahrens db->db.db_data = NULL; 688fa9e4066Sahrens db->db_buf = NULL; 689fa9e4066Sahrens db->db_state = DB_UNCACHED; 690fa9e4066Sahrens } 691fa9e4066Sahrens } 692fa9e4066Sahrens } 693fa9e4066Sahrens 694fa9e4066Sahrens void 695fa9e4066Sahrens dbuf_unoverride(dmu_buf_impl_t *db, uint64_t txg) 696fa9e4066Sahrens { 697fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 698fa9e4066Sahrens if (db->db_d.db_overridden_by[txg&TXG_MASK] == IN_DMU_SYNC) { 699fa9e4066Sahrens db->db_d.db_overridden_by[txg&TXG_MASK] = NULL; 700fa9e4066Sahrens } else if (db->db_d.db_overridden_by[txg&TXG_MASK] != NULL) { 701fa9e4066Sahrens /* free this block */ 702fa9e4066Sahrens ASSERT(list_link_active(&db->db_dirty_node[txg&TXG_MASK]) || 703fa9e4066Sahrens db->db_dnode->dn_free_txg == txg); 704fa9e4066Sahrens if (!BP_IS_HOLE(db->db_d.db_overridden_by[txg&TXG_MASK])) { 705fa9e4066Sahrens /* XXX can get silent EIO here */ 706fa9e4066Sahrens (void) arc_free(NULL, db->db_dnode->dn_objset->os_spa, 707fa9e4066Sahrens txg, db->db_d.db_overridden_by[txg&TXG_MASK], 708fa9e4066Sahrens NULL, NULL, ARC_WAIT); 709fa9e4066Sahrens } 710fa9e4066Sahrens kmem_free(db->db_d.db_overridden_by[txg&TXG_MASK], 711fa9e4066Sahrens sizeof (blkptr_t)); 712fa9e4066Sahrens db->db_d.db_overridden_by[txg&TXG_MASK] = NULL; 713fa9e4066Sahrens /* release the already-written buffer */ 714fa9e4066Sahrens arc_release(db->db_d.db_data_old[txg&TXG_MASK], db); 715fa9e4066Sahrens } 716fa9e4066Sahrens } 717fa9e4066Sahrens 718fa9e4066Sahrens void 719fa9e4066Sahrens dbuf_free_range(dnode_t *dn, uint64_t blkid, uint64_t nblks, dmu_tx_t *tx) 720fa9e4066Sahrens { 721fa9e4066Sahrens dmu_buf_impl_t *db, *db_next; 722fa9e4066Sahrens uint64_t txg = tx->tx_txg; 723fa9e4066Sahrens 724fa9e4066Sahrens dprintf_dnode(dn, "blkid=%llu nblks=%llu\n", blkid, nblks); 725fa9e4066Sahrens mutex_enter(&dn->dn_dbufs_mtx); 726fa9e4066Sahrens for (db = list_head(&dn->dn_dbufs); db; db = db_next) { 727fa9e4066Sahrens db_next = list_next(&dn->dn_dbufs, db); 728fa9e4066Sahrens if ((db->db_level != 0) || (db->db_blkid == DB_BONUS_BLKID)) 729fa9e4066Sahrens continue; 730fa9e4066Sahrens dprintf_dbuf(db, "found buf %s\n", ""); 731fa9e4066Sahrens if (db->db_blkid < blkid || 732fa9e4066Sahrens db->db_blkid >= blkid+nblks) 733fa9e4066Sahrens continue; 734fa9e4066Sahrens 735fa9e4066Sahrens /* found a level 0 buffer in the range */ 736fa9e4066Sahrens if (dbuf_undirty(db, tx)) 737fa9e4066Sahrens continue; 738fa9e4066Sahrens 739fa9e4066Sahrens mutex_enter(&db->db_mtx); 740fa9e4066Sahrens if (db->db_state == DB_UNCACHED) { 741fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 742fa9e4066Sahrens mutex_exit(&db->db_mtx); 743fa9e4066Sahrens continue; 744fa9e4066Sahrens } 745fa9e4066Sahrens if (db->db_state == DB_READ) { 746fa9e4066Sahrens /* this will be handled in dbuf_read_done() */ 747fa9e4066Sahrens db->db_d.db_freed_in_flight = TRUE; 748fa9e4066Sahrens mutex_exit(&db->db_mtx); 749fa9e4066Sahrens continue; 750fa9e4066Sahrens } 751fa9e4066Sahrens if (db->db_state == DB_FILL) { 752fa9e4066Sahrens /* this will be handled in dbuf_rele() */ 753fa9e4066Sahrens db->db_d.db_freed_in_flight = TRUE; 754fa9e4066Sahrens mutex_exit(&db->db_mtx); 755fa9e4066Sahrens continue; 756fa9e4066Sahrens } 757fa9e4066Sahrens 758fa9e4066Sahrens /* make a copy of the data if necessary */ 759fa9e4066Sahrens dbuf_fix_old_data(db, txg); 760fa9e4066Sahrens 761fa9e4066Sahrens if (db->db.db_data) { 762fa9e4066Sahrens /* fill in with appropriate data */ 763fa9e4066Sahrens arc_release(db->db_buf, db); 764fa9e4066Sahrens bzero(db->db.db_data, db->db.db_size); 765fa9e4066Sahrens } 766fa9e4066Sahrens mutex_exit(&db->db_mtx); 767fa9e4066Sahrens } 768fa9e4066Sahrens mutex_exit(&dn->dn_dbufs_mtx); 769fa9e4066Sahrens } 770fa9e4066Sahrens 771fa9e4066Sahrens static int 772fa9e4066Sahrens dbuf_new_block(dmu_buf_impl_t *db, dmu_tx_t *tx) 773fa9e4066Sahrens { 774fa9e4066Sahrens dsl_dataset_t *ds = db->db_objset->os_dsl_dataset; 775fa9e4066Sahrens uint64_t birth_txg = 0; 776fa9e4066Sahrens 777fa9e4066Sahrens /* Don't count meta-objects */ 778fa9e4066Sahrens if (ds == NULL) 779fa9e4066Sahrens return (FALSE); 780fa9e4066Sahrens 781fa9e4066Sahrens /* 782fa9e4066Sahrens * We don't need any locking to protect db_blkptr: 783fa9e4066Sahrens * If it's syncing, then db_dirtied will be set so we'll 784fa9e4066Sahrens * ignore db_blkptr. 785fa9e4066Sahrens */ 786fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); /* XXX strictly necessary? */ 787fa9e4066Sahrens /* If we have been dirtied since the last snapshot, its not new */ 788fa9e4066Sahrens if (db->db_dirtied) 789fa9e4066Sahrens birth_txg = db->db_dirtied; 790fa9e4066Sahrens else if (db->db_blkptr) 791fa9e4066Sahrens birth_txg = db->db_blkptr->blk_birth; 792fa9e4066Sahrens 793fa9e4066Sahrens if (birth_txg) 794fa9e4066Sahrens return (!dsl_dataset_block_freeable(ds, birth_txg, tx)); 795fa9e4066Sahrens else 796fa9e4066Sahrens return (TRUE); 797fa9e4066Sahrens } 798fa9e4066Sahrens 799fa9e4066Sahrens void 800fa9e4066Sahrens dbuf_new_size(dmu_buf_impl_t *db, int size, dmu_tx_t *tx) 801fa9e4066Sahrens { 802fa9e4066Sahrens arc_buf_t *buf, *obuf; 803fa9e4066Sahrens int osize = db->db.db_size; 804fa9e4066Sahrens 805fa9e4066Sahrens /* XXX does *this* func really need the lock? */ 806fa9e4066Sahrens ASSERT(RW_WRITE_HELD(&db->db_dnode->dn_struct_rwlock)); 807fa9e4066Sahrens 808fa9e4066Sahrens ASSERT3U(osize, <=, size); 809fa9e4066Sahrens if (osize == size) 810fa9e4066Sahrens return; 811fa9e4066Sahrens 812fa9e4066Sahrens /* 813fa9e4066Sahrens * This call to dbuf_will_dirty() with the dn_struct_rwlock held 814fa9e4066Sahrens * is OK, because there can be no other references to the db 815fa9e4066Sahrens * when we are changing its size, so no concurrent DB_FILL can 816fa9e4066Sahrens * be happening. 817fa9e4066Sahrens */ 818fa9e4066Sahrens /* Make a copy of the data if necessary */ 819fa9e4066Sahrens dbuf_will_dirty(db, tx); 820fa9e4066Sahrens 821fa9e4066Sahrens /* create the data buffer for the new block */ 822fa9e4066Sahrens buf = arc_buf_alloc(db->db_dnode->dn_objset->os_spa, size, db); 823fa9e4066Sahrens 824fa9e4066Sahrens /* copy old block data to the new block */ 825fa9e4066Sahrens obuf = db->db_buf; 826fa9e4066Sahrens bcopy(obuf->b_data, buf->b_data, osize); 827fa9e4066Sahrens /* zero the remainder */ 828fa9e4066Sahrens bzero((uint8_t *)buf->b_data + osize, size - osize); 829fa9e4066Sahrens 830fa9e4066Sahrens mutex_enter(&db->db_mtx); 831fa9e4066Sahrens /* ASSERT3U(refcount_count(&db->db_holds), ==, 1); */ 832fa9e4066Sahrens dbuf_set_data(db, buf); 833fa9e4066Sahrens arc_buf_free(obuf, db); 834fa9e4066Sahrens db->db.db_size = size; 835fa9e4066Sahrens 836fa9e4066Sahrens /* fix up the dirty info */ 837fa9e4066Sahrens if (db->db_level == 0) 838fa9e4066Sahrens db->db_d.db_data_old[tx->tx_txg&TXG_MASK] = buf; 839fa9e4066Sahrens mutex_exit(&db->db_mtx); 840fa9e4066Sahrens 841fa9e4066Sahrens dnode_willuse_space(db->db_dnode, size-osize, tx); 842fa9e4066Sahrens } 843fa9e4066Sahrens 844fa9e4066Sahrens void 845fa9e4066Sahrens dbuf_dirty(dmu_buf_impl_t *db, dmu_tx_t *tx) 846fa9e4066Sahrens { 847fa9e4066Sahrens dnode_t *dn = db->db_dnode; 848fa9e4066Sahrens objset_impl_t *os = dn->dn_objset; 849fa9e4066Sahrens int drop_struct_lock = FALSE; 850fa9e4066Sahrens int txgoff = tx->tx_txg & TXG_MASK; 851fa9e4066Sahrens 852fa9e4066Sahrens ASSERT(tx->tx_txg != 0); 853fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 854*9c9dc39aSek DMU_TX_DIRTY_BUF(tx, db); 855fa9e4066Sahrens 856fa9e4066Sahrens /* 857fa9e4066Sahrens * Shouldn't dirty a regular buffer in syncing context. Private 858fa9e4066Sahrens * objects may be dirtied in syncing context, but only if they 859fa9e4066Sahrens * were already pre-dirtied in open context. 860fa9e4066Sahrens * XXX We may want to prohibit dirtying in syncing context even 861fa9e4066Sahrens * if they did pre-dirty. 862fa9e4066Sahrens */ 863fa9e4066Sahrens ASSERT(!(dmu_tx_is_syncing(tx) && 864fa9e4066Sahrens !BP_IS_HOLE(&dn->dn_objset->os_rootbp) && 865fa9e4066Sahrens !(dn->dn_object & DMU_PRIVATE_OBJECT) && 866fa9e4066Sahrens dn->dn_objset->os_dsl_dataset != NULL && 867fa9e4066Sahrens !dsl_dir_is_private( 868fa9e4066Sahrens dn->dn_objset->os_dsl_dataset->ds_dir))); 869fa9e4066Sahrens 870fa9e4066Sahrens /* 871fa9e4066Sahrens * We make this assert for private objects as well, but after we 872fa9e4066Sahrens * check if we're already dirty. They are allowed to re-dirty 873fa9e4066Sahrens * in syncing context. 874fa9e4066Sahrens */ 875fa9e4066Sahrens ASSERT(dn->dn_object & DMU_PRIVATE_OBJECT || 876fa9e4066Sahrens dn->dn_dirtyctx == DN_UNDIRTIED || 877fa9e4066Sahrens dn->dn_dirtyctx == 878fa9e4066Sahrens (dmu_tx_is_syncing(tx) ? DN_DIRTY_SYNC : DN_DIRTY_OPEN)); 879fa9e4066Sahrens 880fa9e4066Sahrens mutex_enter(&db->db_mtx); 881fa9e4066Sahrens /* XXX make this true for indirects too? */ 882fa9e4066Sahrens ASSERT(db->db_level != 0 || db->db_state == DB_CACHED || 883fa9e4066Sahrens db->db_state == DB_FILL); 884fa9e4066Sahrens 885fa9e4066Sahrens /* 886fa9e4066Sahrens * If this buffer is currently part of an "overridden" region, 887fa9e4066Sahrens * we now need to remove it from that region. 888fa9e4066Sahrens */ 889fa9e4066Sahrens if (db->db_level == 0 && db->db_blkid != DB_BONUS_BLKID && 890fa9e4066Sahrens db->db_d.db_overridden_by[txgoff] != NULL) { 891fa9e4066Sahrens dbuf_unoverride(db, tx->tx_txg); 892fa9e4066Sahrens } 893fa9e4066Sahrens 894fa9e4066Sahrens mutex_enter(&dn->dn_mtx); 895fa9e4066Sahrens /* 896fa9e4066Sahrens * Don't set dirtyctx to SYNC if we're just modifying this as we 897fa9e4066Sahrens * initialize the objset. 898fa9e4066Sahrens */ 899fa9e4066Sahrens if (dn->dn_dirtyctx == DN_UNDIRTIED && 900fa9e4066Sahrens !BP_IS_HOLE(&dn->dn_objset->os_rootbp)) { 901fa9e4066Sahrens dn->dn_dirtyctx = 902fa9e4066Sahrens (dmu_tx_is_syncing(tx) ? DN_DIRTY_SYNC : DN_DIRTY_OPEN); 903fa9e4066Sahrens ASSERT(dn->dn_dirtyctx_firstset == NULL); 904fa9e4066Sahrens dn->dn_dirtyctx_firstset = kmem_alloc(1, KM_SLEEP); 905fa9e4066Sahrens } 906fa9e4066Sahrens mutex_exit(&dn->dn_mtx); 907fa9e4066Sahrens 908fa9e4066Sahrens /* 909fa9e4066Sahrens * If this buffer is already dirty, we're done. 910fa9e4066Sahrens */ 911fa9e4066Sahrens if (list_link_active(&db->db_dirty_node[txgoff])) { 912fa9e4066Sahrens mutex_exit(&db->db_mtx); 913fa9e4066Sahrens return; 914fa9e4066Sahrens } 915fa9e4066Sahrens 916fa9e4066Sahrens /* 917fa9e4066Sahrens * Only valid if not already dirty. 918fa9e4066Sahrens */ 919fa9e4066Sahrens ASSERT(dn->dn_dirtyctx == DN_UNDIRTIED || dn->dn_dirtyctx == 920fa9e4066Sahrens (dmu_tx_is_syncing(tx) ? DN_DIRTY_SYNC : DN_DIRTY_OPEN)); 921fa9e4066Sahrens 922fa9e4066Sahrens ASSERT3U(dn->dn_nlevels, >, db->db_level); 923fa9e4066Sahrens ASSERT((dn->dn_phys->dn_nlevels == 0 && db->db_level == 0) || 924fa9e4066Sahrens dn->dn_phys->dn_nlevels > db->db_level || 925fa9e4066Sahrens dn->dn_next_nlevels[txgoff] > db->db_level || 926fa9e4066Sahrens dn->dn_next_nlevels[(tx->tx_txg-1) & TXG_MASK] > db->db_level || 927fa9e4066Sahrens dn->dn_next_nlevels[(tx->tx_txg-2) & TXG_MASK] > db->db_level); 928fa9e4066Sahrens 929fa9e4066Sahrens /* 930fa9e4066Sahrens * We should only be dirtying in syncing context if it's the 931fa9e4066Sahrens * mos, a spa os, or we're initializing the os. However, we are 932fa9e4066Sahrens * allowed to dirty in syncing context provided we already 933fa9e4066Sahrens * dirtied it in open context. Hence we must make this 934fa9e4066Sahrens * assertion only if we're not already dirty. 935fa9e4066Sahrens */ 936fa9e4066Sahrens ASSERT(!dmu_tx_is_syncing(tx) || 937fa9e4066Sahrens os->os_dsl_dataset == NULL || 938fa9e4066Sahrens !dsl_dir_is_private(os->os_dsl_dataset->ds_dir) || 939fa9e4066Sahrens !BP_IS_HOLE(&os->os_rootbp)); 940fa9e4066Sahrens ASSERT(db->db.db_size != 0); 941fa9e4066Sahrens 942fa9e4066Sahrens dprintf_dbuf(db, "size=%llx\n", (u_longlong_t)db->db.db_size); 943fa9e4066Sahrens 944fa9e4066Sahrens if (db->db_level == 0) { 945fa9e4066Sahrens /* 946fa9e4066Sahrens * Release the data buffer from the cache so that we 947fa9e4066Sahrens * can modify it without impacting possible other users 948fa9e4066Sahrens * of this cached data block. Note that indirect blocks 949fa9e4066Sahrens * and private objects are not released until the syncing 950fa9e4066Sahrens * state (since they are only modified then). 951fa9e4066Sahrens * 952fa9e4066Sahrens * If this buffer is dirty in an old transaction group we need 953fa9e4066Sahrens * to make a copy of it so that the changes we make in this 954fa9e4066Sahrens * transaction group won't leak out when we sync the older txg. 955fa9e4066Sahrens */ 956fa9e4066Sahrens ASSERT(db->db_buf != NULL); 957fa9e4066Sahrens ASSERT(db->db.db_data != NULL); 958fa9e4066Sahrens ASSERT(db->db_d.db_data_old[txgoff] == NULL); 959fa9e4066Sahrens if (!(db->db.db_object & DMU_PRIVATE_OBJECT)) { 960fa9e4066Sahrens arc_release(db->db_buf, db); 961fa9e4066Sahrens dbuf_fix_old_data(db, tx->tx_txg); 962fa9e4066Sahrens ASSERT(db->db_buf != NULL); 963fa9e4066Sahrens } 964fa9e4066Sahrens db->db_d.db_data_old[txgoff] = db->db_buf; 965fa9e4066Sahrens } 966fa9e4066Sahrens 967fa9e4066Sahrens mutex_enter(&dn->dn_mtx); 968fa9e4066Sahrens /* 969fa9e4066Sahrens * We could have been freed_in_flight between the dbuf_noread 970fa9e4066Sahrens * and dbuf_dirty. We win, as though the dbuf_noread() had 971fa9e4066Sahrens * happened after the free. 972fa9e4066Sahrens */ 973fa9e4066Sahrens if (db->db_level == 0 && db->db_blkid != DB_BONUS_BLKID) { 974fa9e4066Sahrens dnode_clear_range(dn, db->db_blkid, 1, tx); 975fa9e4066Sahrens db->db_d.db_freed_in_flight = FALSE; 976fa9e4066Sahrens } 977fa9e4066Sahrens 978fa9e4066Sahrens db->db_dirtied = tx->tx_txg; 979fa9e4066Sahrens list_insert_tail(&dn->dn_dirty_dbufs[txgoff], db); 980fa9e4066Sahrens mutex_exit(&dn->dn_mtx); 981fa9e4066Sahrens 982fa9e4066Sahrens /* 983fa9e4066Sahrens * If writting this buffer will consume a new block on disk, 984fa9e4066Sahrens * then update the accounting. 985fa9e4066Sahrens */ 986fa9e4066Sahrens if (db->db_blkid != DB_BONUS_BLKID) { 987fa9e4066Sahrens if (!dbuf_new_block(db, tx) && db->db_blkptr) { 988fa9e4066Sahrens /* 989fa9e4066Sahrens * This is only a guess -- if the dbuf is dirty 990fa9e4066Sahrens * in a previous txg, we don't know how much 991fa9e4066Sahrens * space it will use on disk yet. We should 992fa9e4066Sahrens * really have the struct_rwlock to access 993fa9e4066Sahrens * db_blkptr, but since this is just a guess, 994fa9e4066Sahrens * it's OK if we get an odd answer. 995fa9e4066Sahrens */ 996fa9e4066Sahrens dnode_willuse_space(dn, 997fa9e4066Sahrens -BP_GET_ASIZE(db->db_blkptr), tx); 998fa9e4066Sahrens } 999fa9e4066Sahrens dnode_willuse_space(dn, db->db.db_size, tx); 1000fa9e4066Sahrens } 1001fa9e4066Sahrens 1002fa9e4066Sahrens /* 1003fa9e4066Sahrens * This buffer is now part of this txg 1004fa9e4066Sahrens */ 1005fa9e4066Sahrens dbuf_add_ref(db, (void *)(uintptr_t)tx->tx_txg); 1006fa9e4066Sahrens db->db_dirtycnt += 1; 1007fa9e4066Sahrens ASSERT3U(db->db_dirtycnt, <=, 3); 1008fa9e4066Sahrens 1009fa9e4066Sahrens mutex_exit(&db->db_mtx); 1010fa9e4066Sahrens 1011fa9e4066Sahrens if (db->db_blkid == DB_BONUS_BLKID) { 1012fa9e4066Sahrens dnode_setdirty(dn, tx); 1013fa9e4066Sahrens return; 1014fa9e4066Sahrens } 1015fa9e4066Sahrens 1016fa9e4066Sahrens if (db->db_level == 0) 1017fa9e4066Sahrens dnode_new_blkid(dn, db->db_blkid, tx); 1018fa9e4066Sahrens 1019fa9e4066Sahrens if (!RW_WRITE_HELD(&dn->dn_struct_rwlock)) { 1020fa9e4066Sahrens rw_enter(&dn->dn_struct_rwlock, RW_READER); 1021fa9e4066Sahrens drop_struct_lock = TRUE; 1022fa9e4066Sahrens } 1023fa9e4066Sahrens 1024fa9e4066Sahrens if (db->db_level < dn->dn_nlevels-1) { 1025fa9e4066Sahrens int epbs = dn->dn_indblkshift - SPA_BLKPTRSHIFT; 1026fa9e4066Sahrens dmu_buf_impl_t *parent; 1027fa9e4066Sahrens parent = dbuf_hold_level(dn, db->db_level+1, 1028fa9e4066Sahrens db->db_blkid >> epbs, FTAG); 1029fa9e4066Sahrens if (drop_struct_lock) 1030fa9e4066Sahrens rw_exit(&dn->dn_struct_rwlock); 1031fa9e4066Sahrens dbuf_dirty(parent, tx); 1032fa9e4066Sahrens dbuf_remove_ref(parent, FTAG); 1033fa9e4066Sahrens } else { 1034fa9e4066Sahrens if (drop_struct_lock) 1035fa9e4066Sahrens rw_exit(&dn->dn_struct_rwlock); 1036fa9e4066Sahrens } 1037fa9e4066Sahrens 1038fa9e4066Sahrens dnode_setdirty(dn, tx); 1039fa9e4066Sahrens } 1040fa9e4066Sahrens 1041fa9e4066Sahrens static int 1042fa9e4066Sahrens dbuf_undirty(dmu_buf_impl_t *db, dmu_tx_t *tx) 1043fa9e4066Sahrens { 1044fa9e4066Sahrens dnode_t *dn = db->db_dnode; 1045fa9e4066Sahrens int txgoff = tx->tx_txg & TXG_MASK; 1046fa9e4066Sahrens 1047fa9e4066Sahrens ASSERT(tx->tx_txg != 0); 1048fa9e4066Sahrens 1049fa9e4066Sahrens mutex_enter(&db->db_mtx); 1050fa9e4066Sahrens 1051fa9e4066Sahrens /* 1052fa9e4066Sahrens * If this buffer is not dirty, we're done. 1053fa9e4066Sahrens */ 1054fa9e4066Sahrens if (!list_link_active(&db->db_dirty_node[txgoff])) { 1055fa9e4066Sahrens mutex_exit(&db->db_mtx); 1056fa9e4066Sahrens return (0); 1057fa9e4066Sahrens } 1058fa9e4066Sahrens 1059fa9e4066Sahrens /* 1060fa9e4066Sahrens * If this buffer is currently held, we cannot undirty 1061fa9e4066Sahrens * it, since one of the current holders may be in the 1062fa9e4066Sahrens * middle of an update. Note that users of dbuf_undirty() 1063fa9e4066Sahrens * should not place a hold on the dbuf before the call. 1064fa9e4066Sahrens * XXX - this check assumes we are being called from 1065fa9e4066Sahrens * dbuf_free_range(), perhaps we should move it there? 1066fa9e4066Sahrens */ 1067fa9e4066Sahrens if (refcount_count(&db->db_holds) > db->db_dirtycnt) { 1068fa9e4066Sahrens mutex_exit(&db->db_mtx); 1069fa9e4066Sahrens mutex_enter(&dn->dn_mtx); 1070fa9e4066Sahrens dnode_clear_range(dn, db->db_blkid, 1, tx); 1071fa9e4066Sahrens mutex_exit(&dn->dn_mtx); 1072fa9e4066Sahrens return (0); 1073fa9e4066Sahrens } 1074fa9e4066Sahrens 1075fa9e4066Sahrens dprintf_dbuf(db, "size=%llx\n", (u_longlong_t)db->db.db_size); 1076fa9e4066Sahrens 1077fa9e4066Sahrens dbuf_unoverride(db, tx->tx_txg); 1078fa9e4066Sahrens 1079fa9e4066Sahrens ASSERT(db->db.db_size != 0); 1080fa9e4066Sahrens if (db->db_level == 0) { 1081fa9e4066Sahrens ASSERT(db->db_buf != NULL); 1082fa9e4066Sahrens ASSERT(db->db_d.db_data_old[txgoff] != NULL); 1083fa9e4066Sahrens if (db->db_d.db_data_old[txgoff] != db->db_buf) 1084fa9e4066Sahrens arc_buf_free(db->db_d.db_data_old[txgoff], db); 1085fa9e4066Sahrens db->db_d.db_data_old[txgoff] = NULL; 1086fa9e4066Sahrens } 1087fa9e4066Sahrens 1088fa9e4066Sahrens /* XXX would be nice to fix up dn_towrite_space[] */ 1089fa9e4066Sahrens /* XXX undo db_dirtied? but how? */ 1090fa9e4066Sahrens /* db->db_dirtied = tx->tx_txg; */ 1091fa9e4066Sahrens 1092fa9e4066Sahrens mutex_enter(&dn->dn_mtx); 1093fa9e4066Sahrens list_remove(&dn->dn_dirty_dbufs[txgoff], db); 1094fa9e4066Sahrens mutex_exit(&dn->dn_mtx); 1095fa9e4066Sahrens 1096fa9e4066Sahrens ASSERT(db->db_dirtycnt > 0); 1097fa9e4066Sahrens db->db_dirtycnt -= 1; 1098fa9e4066Sahrens 1099fa9e4066Sahrens if (refcount_remove(&db->db_holds, 1100fa9e4066Sahrens (void *)(uintptr_t)tx->tx_txg) == 0) { 1101fa9e4066Sahrens /* make duf_verify() happy */ 1102fa9e4066Sahrens if (db->db.db_data) 1103fa9e4066Sahrens bzero(db->db.db_data, db->db.db_size); 1104fa9e4066Sahrens 1105fa9e4066Sahrens dbuf_evict(db); 1106fa9e4066Sahrens return (1); 1107fa9e4066Sahrens } 1108fa9e4066Sahrens 1109fa9e4066Sahrens mutex_exit(&db->db_mtx); 1110fa9e4066Sahrens return (0); 1111fa9e4066Sahrens } 1112fa9e4066Sahrens 1113fa9e4066Sahrens #pragma weak dmu_buf_will_dirty = dbuf_will_dirty 1114fa9e4066Sahrens void 1115fa9e4066Sahrens dbuf_will_dirty(dmu_buf_impl_t *db, dmu_tx_t *tx) 1116fa9e4066Sahrens { 1117fa9e4066Sahrens int rf = DB_RF_MUST_SUCCEED; 1118fa9e4066Sahrens 1119fa9e4066Sahrens ASSERT(tx->tx_txg != 0); 1120fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 1121fa9e4066Sahrens 1122fa9e4066Sahrens if (RW_WRITE_HELD(&db->db_dnode->dn_struct_rwlock)) 1123fa9e4066Sahrens rf |= DB_RF_HAVESTRUCT; 1124fa9e4066Sahrens (void) dbuf_read_generic(db, rf); 1125fa9e4066Sahrens dbuf_dirty(db, tx); 1126fa9e4066Sahrens } 1127fa9e4066Sahrens 1128fa9e4066Sahrens #pragma weak dmu_buf_will_fill = dbuf_will_fill 1129fa9e4066Sahrens void 1130fa9e4066Sahrens dbuf_will_fill(dmu_buf_impl_t *db, dmu_tx_t *tx) 1131fa9e4066Sahrens { 1132fa9e4066Sahrens ASSERT(tx->tx_txg != 0); 1133fa9e4066Sahrens ASSERT(db->db_level == 0); 1134fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 1135fa9e4066Sahrens 1136fa9e4066Sahrens ASSERT(!(db->db.db_object & DMU_PRIVATE_OBJECT) || 1137fa9e4066Sahrens dmu_tx_private_ok(tx)); 1138fa9e4066Sahrens 1139fa9e4066Sahrens dbuf_noread(db); 1140fa9e4066Sahrens dbuf_dirty(db, tx); 1141fa9e4066Sahrens } 1142fa9e4066Sahrens 1143fa9e4066Sahrens #pragma weak dmu_buf_fill_done = dbuf_fill_done 1144fa9e4066Sahrens /* ARGSUSED */ 1145fa9e4066Sahrens void 1146fa9e4066Sahrens dbuf_fill_done(dmu_buf_impl_t *db, dmu_tx_t *tx) 1147fa9e4066Sahrens { 1148fa9e4066Sahrens mutex_enter(&db->db_mtx); 1149*9c9dc39aSek DBUF_VERIFY(db); 1150fa9e4066Sahrens 1151fa9e4066Sahrens if (db->db_state == DB_FILL) { 1152fa9e4066Sahrens if (db->db_level == 0 && db->db_d.db_freed_in_flight) { 1153fa9e4066Sahrens /* we were freed while filling */ 1154fa9e4066Sahrens /* XXX dbuf_undirty? */ 1155fa9e4066Sahrens bzero(db->db.db_data, db->db.db_size); 1156fa9e4066Sahrens db->db_d.db_freed_in_flight = FALSE; 1157fa9e4066Sahrens } 1158fa9e4066Sahrens db->db_state = DB_CACHED; 1159fa9e4066Sahrens cv_broadcast(&db->db_changed); 1160fa9e4066Sahrens } 1161fa9e4066Sahrens mutex_exit(&db->db_mtx); 1162fa9e4066Sahrens } 1163fa9e4066Sahrens 1164fa9e4066Sahrens 1165fa9e4066Sahrens static void 1166fa9e4066Sahrens dbuf_clear(dmu_buf_impl_t *db) 1167fa9e4066Sahrens { 1168fa9e4066Sahrens dnode_t *dn = db->db_dnode; 1169fa9e4066Sahrens 1170fa9e4066Sahrens ASSERT(MUTEX_HELD(&dn->dn_dbufs_mtx)); 1171fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 1172fa9e4066Sahrens ASSERT(refcount_is_zero(&db->db_holds)); 1173fa9e4066Sahrens 1174fa9e4066Sahrens if (db->db_state == DB_CACHED) { 1175fa9e4066Sahrens ASSERT(db->db_buf != NULL); 1176fa9e4066Sahrens arc_buf_free(db->db_buf, db); 1177fa9e4066Sahrens db->db.db_data = NULL; 1178fa9e4066Sahrens db->db_buf = NULL; 1179fa9e4066Sahrens db->db_state = DB_UNCACHED; 1180fa9e4066Sahrens } 1181fa9e4066Sahrens 1182fa9e4066Sahrens ASSERT3U(db->db_state, ==, DB_UNCACHED); 1183fa9e4066Sahrens ASSERT(db->db_buf == NULL); 1184fa9e4066Sahrens ASSERT(db->db_data_pending == NULL); 1185fa9e4066Sahrens 1186fa9e4066Sahrens mutex_exit(&db->db_mtx); 1187fa9e4066Sahrens 1188fa9e4066Sahrens /* 1189fa9e4066Sahrens * If this dbuf is referened from an indirect dbuf, 1190fa9e4066Sahrens * decrement the ref count on the indirect dbuf. 1191fa9e4066Sahrens */ 1192fa9e4066Sahrens if (db->db_parent && db->db_parent != dn->dn_dbuf) 1193fa9e4066Sahrens dbuf_remove_ref(db->db_parent, db); 1194fa9e4066Sahrens 1195fa9e4066Sahrens /* remove from dn_dbufs */ 1196fa9e4066Sahrens list_remove(&dn->dn_dbufs, db); 1197fa9e4066Sahrens 1198fa9e4066Sahrens dnode_rele(dn, db); 1199fa9e4066Sahrens 1200fa9e4066Sahrens dbuf_hash_remove(db); 1201fa9e4066Sahrens 1202fa9e4066Sahrens db->db_dnode = NULL; 1203fa9e4066Sahrens db->db_parent = NULL; 1204fa9e4066Sahrens db->db_blkptr = NULL; 1205fa9e4066Sahrens } 1206fa9e4066Sahrens 1207fa9e4066Sahrens static int 1208fa9e4066Sahrens dbuf_findbp(dnode_t *dn, int level, uint64_t blkid, int fail_sparse, 1209fa9e4066Sahrens dmu_buf_impl_t **parentp, blkptr_t **bpp) 1210fa9e4066Sahrens { 1211fa9e4066Sahrens int nlevels, epbs; 1212fa9e4066Sahrens 1213fa9e4066Sahrens if (dn->dn_phys->dn_nlevels == 0) 1214fa9e4066Sahrens nlevels = 1; 1215fa9e4066Sahrens else 1216fa9e4066Sahrens nlevels = dn->dn_phys->dn_nlevels; 1217fa9e4066Sahrens 1218fa9e4066Sahrens epbs = dn->dn_indblkshift - SPA_BLKPTRSHIFT; 1219fa9e4066Sahrens 1220fa9e4066Sahrens ASSERT3U(level * epbs, <, 64); 1221fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 1222fa9e4066Sahrens if (blkid == DB_BONUS_BLKID) { 1223fa9e4066Sahrens /* this is the bonus buffer */ 1224fa9e4066Sahrens *parentp = NULL; 1225fa9e4066Sahrens *bpp = NULL; 1226fa9e4066Sahrens return (0); 1227fa9e4066Sahrens } else if (level >= nlevels || 1228fa9e4066Sahrens (blkid > (dn->dn_phys->dn_maxblkid >> (level * epbs)))) { 1229fa9e4066Sahrens /* the buffer has no parent yet */ 1230fa9e4066Sahrens *parentp = NULL; 1231fa9e4066Sahrens *bpp = NULL; 1232fa9e4066Sahrens return (ENOENT); 1233fa9e4066Sahrens } else if (level < nlevels-1) { 1234fa9e4066Sahrens /* this block is referenced from an indirect block */ 1235fa9e4066Sahrens int err = dbuf_hold_impl(dn, level+1, 1236fa9e4066Sahrens blkid >> epbs, fail_sparse, NULL, parentp); 1237fa9e4066Sahrens if (err) 1238fa9e4066Sahrens return (err); 1239fa9e4066Sahrens dbuf_read_havestruct(*parentp); 1240fa9e4066Sahrens *bpp = ((blkptr_t *)(*parentp)->db.db_data) + 1241fa9e4066Sahrens (blkid & ((1ULL << epbs) - 1)); 1242fa9e4066Sahrens return (0); 1243fa9e4066Sahrens } else { 1244fa9e4066Sahrens /* the block is referenced from the dnode */ 1245fa9e4066Sahrens ASSERT3U(level, ==, nlevels-1); 1246fa9e4066Sahrens ASSERT(dn->dn_phys->dn_nblkptr == 0 || 1247fa9e4066Sahrens blkid < dn->dn_phys->dn_nblkptr); 1248fa9e4066Sahrens *parentp = dn->dn_dbuf; 1249fa9e4066Sahrens *bpp = &dn->dn_phys->dn_blkptr[blkid]; 1250fa9e4066Sahrens return (0); 1251fa9e4066Sahrens } 1252fa9e4066Sahrens } 1253fa9e4066Sahrens 1254fa9e4066Sahrens static dmu_buf_impl_t * 1255fa9e4066Sahrens dbuf_create(dnode_t *dn, uint8_t level, uint64_t blkid, 1256fa9e4066Sahrens dmu_buf_impl_t *parent, blkptr_t *blkptr) 1257fa9e4066Sahrens { 1258fa9e4066Sahrens objset_impl_t *os = dn->dn_objset; 1259fa9e4066Sahrens dmu_buf_impl_t *db, *odb; 1260fa9e4066Sahrens 1261fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 1262fa9e4066Sahrens ASSERT(dn->dn_type != DMU_OT_NONE); 1263fa9e4066Sahrens 1264fa9e4066Sahrens db = kmem_cache_alloc(dbuf_cache, KM_SLEEP); 1265fa9e4066Sahrens 1266fa9e4066Sahrens db->db_objset = os; 1267fa9e4066Sahrens db->db.db_object = dn->dn_object; 1268fa9e4066Sahrens db->db_level = level; 1269fa9e4066Sahrens db->db_blkid = blkid; 1270fa9e4066Sahrens db->db_state = DB_UNCACHED; 1271fa9e4066Sahrens 1272fa9e4066Sahrens if (db->db_blkid == DB_BONUS_BLKID) { 1273fa9e4066Sahrens db->db.db_size = dn->dn_bonuslen; 1274fa9e4066Sahrens db->db.db_offset = DB_BONUS_BLKID; 1275fa9e4066Sahrens } else { 1276fa9e4066Sahrens int blocksize = 1277fa9e4066Sahrens db->db_level ? 1<<dn->dn_indblkshift : dn->dn_datablksz; 1278fa9e4066Sahrens db->db.db_size = blocksize; 1279fa9e4066Sahrens db->db.db_offset = db->db_blkid * blocksize; 1280fa9e4066Sahrens } 1281fa9e4066Sahrens 1282fa9e4066Sahrens db->db_dirtied = 0; 1283fa9e4066Sahrens db->db_dirtycnt = 0; 1284fa9e4066Sahrens 1285fa9e4066Sahrens bzero(&db->db_d, sizeof (db->db_d)); 1286fa9e4066Sahrens 1287fa9e4066Sahrens /* 1288fa9e4066Sahrens * Hold the dn_dbufs_mtx while we get the new dbuf 1289fa9e4066Sahrens * in the hash table *and* added to the dbufs list. 1290fa9e4066Sahrens * This prevents a possible deadlock with someone 1291fa9e4066Sahrens * trying to look up this dbuf before its added to the 1292fa9e4066Sahrens * dn_dbufs list. 1293fa9e4066Sahrens */ 1294fa9e4066Sahrens mutex_enter(&dn->dn_dbufs_mtx); 1295fa9e4066Sahrens if ((odb = dbuf_hash_insert(db)) != NULL) { 1296fa9e4066Sahrens /* someone else inserted it first */ 1297fa9e4066Sahrens kmem_cache_free(dbuf_cache, db); 1298fa9e4066Sahrens mutex_exit(&dn->dn_dbufs_mtx); 1299fa9e4066Sahrens return (odb); 1300fa9e4066Sahrens } 1301fa9e4066Sahrens list_insert_head(&dn->dn_dbufs, db); 1302fa9e4066Sahrens mutex_exit(&dn->dn_dbufs_mtx); 1303fa9e4066Sahrens 1304fa9e4066Sahrens if (parent && parent != dn->dn_dbuf) 1305fa9e4066Sahrens dbuf_add_ref(parent, db); 1306fa9e4066Sahrens 1307fa9e4066Sahrens (void) refcount_add(&dn->dn_holds, db); 1308fa9e4066Sahrens 1309fa9e4066Sahrens db->db_dnode = dn; 1310fa9e4066Sahrens db->db_parent = parent; 1311fa9e4066Sahrens db->db_blkptr = blkptr; 1312fa9e4066Sahrens 1313fa9e4066Sahrens dprintf_dbuf(db, "db=%p\n", db); 1314fa9e4066Sahrens 1315fa9e4066Sahrens return (db); 1316fa9e4066Sahrens } 1317fa9e4066Sahrens 1318fa9e4066Sahrens static int 1319fa9e4066Sahrens dbuf_evictable(dmu_buf_impl_t *db) 1320fa9e4066Sahrens { 1321fa9e4066Sahrens int i; 1322fa9e4066Sahrens 1323fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 1324*9c9dc39aSek DBUF_VERIFY(db); 1325fa9e4066Sahrens 1326fa9e4066Sahrens if (db->db_state != DB_UNCACHED && db->db_state != DB_CACHED) 1327fa9e4066Sahrens return (FALSE); 1328fa9e4066Sahrens 1329fa9e4066Sahrens if (!refcount_is_zero(&db->db_holds)) 1330fa9e4066Sahrens return (FALSE); 1331fa9e4066Sahrens 1332fa9e4066Sahrens #ifdef ZFS_DEBUG 1333fa9e4066Sahrens for (i = 0; i < TXG_SIZE; i++) { 1334fa9e4066Sahrens ASSERT(!list_link_active(&db->db_dirty_node[i])); 1335fa9e4066Sahrens ASSERT(db->db_level != 0 || db->db_d.db_data_old[i] == NULL); 1336fa9e4066Sahrens } 1337fa9e4066Sahrens #endif 1338fa9e4066Sahrens 1339fa9e4066Sahrens /* 1340fa9e4066Sahrens * Now we know we want to free it. 1341fa9e4066Sahrens * This call must be done last, since it has side effects - 1342fa9e4066Sahrens * calling the db_evict_func(). 1343fa9e4066Sahrens */ 1344fa9e4066Sahrens dbuf_evict_user(db); 1345fa9e4066Sahrens return (TRUE); 1346fa9e4066Sahrens } 1347fa9e4066Sahrens 1348fa9e4066Sahrens static void 1349fa9e4066Sahrens dbuf_destroy(dmu_buf_impl_t *db) 1350fa9e4066Sahrens { 1351fa9e4066Sahrens ASSERT(refcount_is_zero(&db->db_holds)); 1352fa9e4066Sahrens 1353fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 1354fa9e4066Sahrens ASSERT(db->db_dnode == NULL); 1355fa9e4066Sahrens ASSERT(db->db_parent == NULL); 1356fa9e4066Sahrens ASSERT(db->db_hash_next == NULL); 1357fa9e4066Sahrens ASSERT(db->db_blkptr == NULL); 1358fa9e4066Sahrens ASSERT(db->db_data_pending == NULL); 1359fa9e4066Sahrens 1360fa9e4066Sahrens kmem_cache_free(dbuf_cache, db); 1361fa9e4066Sahrens } 1362fa9e4066Sahrens 1363fa9e4066Sahrens void 1364fa9e4066Sahrens dbuf_prefetch(dnode_t *dn, uint64_t blkid) 1365fa9e4066Sahrens { 1366fa9e4066Sahrens dmu_buf_impl_t *db, *parent = NULL; 1367fa9e4066Sahrens blkptr_t *bp = NULL; 1368fa9e4066Sahrens 1369fa9e4066Sahrens ASSERT(blkid != DB_BONUS_BLKID); 1370fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 1371fa9e4066Sahrens 1372fa9e4066Sahrens if (dnode_block_freed(dn, blkid)) 1373fa9e4066Sahrens return; 1374fa9e4066Sahrens 1375fa9e4066Sahrens /* dbuf_find() returns with db_mtx held */ 1376fa9e4066Sahrens if (db = dbuf_find(dn, 0, blkid)) { 1377fa9e4066Sahrens /* 1378fa9e4066Sahrens * This dbuf is already in the cache. We assume that 1379fa9e4066Sahrens * it is already CACHED, or else about to be either 1380fa9e4066Sahrens * read or filled. 1381fa9e4066Sahrens */ 1382fa9e4066Sahrens mutex_exit(&db->db_mtx); 1383fa9e4066Sahrens return; 1384fa9e4066Sahrens } 1385fa9e4066Sahrens 1386fa9e4066Sahrens if (dbuf_findbp(dn, 0, blkid, TRUE, &parent, &bp) == 0) { 1387fa9e4066Sahrens if (bp && !BP_IS_HOLE(bp)) { 1388fa9e4066Sahrens (void) arc_read(NULL, dn->dn_objset->os_spa, bp, 1389fa9e4066Sahrens dmu_ot[dn->dn_type].ot_byteswap, 1390fa9e4066Sahrens NULL, NULL, ZIO_PRIORITY_ASYNC_READ, 1391fa9e4066Sahrens ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE, 1392fa9e4066Sahrens (ARC_NOWAIT | ARC_PREFETCH)); 1393fa9e4066Sahrens } 1394fa9e4066Sahrens if (parent && parent != dn->dn_dbuf) 1395fa9e4066Sahrens dbuf_rele(parent); 1396fa9e4066Sahrens } 1397fa9e4066Sahrens } 1398fa9e4066Sahrens 1399fa9e4066Sahrens /* 1400fa9e4066Sahrens * Returns with db_holds incremented, and db_mtx not held. 1401fa9e4066Sahrens * Note: dn_struct_rwlock must be held. 1402fa9e4066Sahrens */ 1403fa9e4066Sahrens int 1404fa9e4066Sahrens dbuf_hold_impl(dnode_t *dn, uint8_t level, uint64_t blkid, int fail_sparse, 1405fa9e4066Sahrens void *tag, dmu_buf_impl_t **dbp) 1406fa9e4066Sahrens { 1407fa9e4066Sahrens dmu_buf_impl_t *db, *parent = NULL; 1408fa9e4066Sahrens 1409fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 1410fa9e4066Sahrens ASSERT3U(dn->dn_nlevels, >, level); 1411fa9e4066Sahrens 1412fa9e4066Sahrens *dbp = NULL; 1413fa9e4066Sahrens 1414fa9e4066Sahrens /* dbuf_find() returns with db_mtx held */ 1415fa9e4066Sahrens db = dbuf_find(dn, level, blkid); 1416fa9e4066Sahrens 1417fa9e4066Sahrens if (db == NULL) { 1418fa9e4066Sahrens blkptr_t *bp = NULL; 1419fa9e4066Sahrens int err; 1420fa9e4066Sahrens 1421fa9e4066Sahrens err = dbuf_findbp(dn, level, blkid, fail_sparse, &parent, &bp); 1422fa9e4066Sahrens if (fail_sparse) { 1423fa9e4066Sahrens if (err == 0 && bp && BP_IS_HOLE(bp)) 1424fa9e4066Sahrens err = ENOENT; 1425fa9e4066Sahrens if (err) { 1426fa9e4066Sahrens if (parent && parent != dn->dn_dbuf) 1427fa9e4066Sahrens dbuf_rele(parent); 1428fa9e4066Sahrens return (err); 1429fa9e4066Sahrens } 1430fa9e4066Sahrens } 1431fa9e4066Sahrens db = dbuf_create(dn, level, blkid, parent, bp); 1432fa9e4066Sahrens } 1433fa9e4066Sahrens 1434fa9e4066Sahrens /* 1435fa9e4066Sahrens * If this buffer is currently syncing out, and we are 1436fa9e4066Sahrens * are still referencing it from db_data, we need to make 1437fa9e4066Sahrens * a copy of it in case we decide we want to dirty it 1438fa9e4066Sahrens * again in this txg. 1439fa9e4066Sahrens */ 1440fa9e4066Sahrens if (db->db_level == 0 && db->db_state == DB_CACHED && 1441fa9e4066Sahrens !(dn->dn_object & DMU_PRIVATE_OBJECT) && 1442fa9e4066Sahrens db->db_data_pending == db->db_buf) { 1443fa9e4066Sahrens int size = (db->db_blkid == DB_BONUS_BLKID) ? 1444fa9e4066Sahrens DN_MAX_BONUSLEN : db->db.db_size; 1445fa9e4066Sahrens 1446fa9e4066Sahrens dbuf_set_data(db, arc_buf_alloc(db->db_dnode->dn_objset->os_spa, 1447fa9e4066Sahrens size, db)); 1448fa9e4066Sahrens bcopy(db->db_data_pending->b_data, db->db.db_data, 1449fa9e4066Sahrens db->db.db_size); 1450fa9e4066Sahrens } 1451fa9e4066Sahrens 1452fa9e4066Sahrens dbuf_add_ref(db, tag); 1453fa9e4066Sahrens dbuf_update_data(db); 1454*9c9dc39aSek DBUF_VERIFY(db); 1455fa9e4066Sahrens mutex_exit(&db->db_mtx); 1456fa9e4066Sahrens 1457fa9e4066Sahrens /* NOTE: we can't rele the parent until after we drop the db_mtx */ 1458fa9e4066Sahrens if (parent && parent != dn->dn_dbuf) 1459fa9e4066Sahrens dbuf_rele(parent); 1460fa9e4066Sahrens 1461fa9e4066Sahrens ASSERT3P(db->db_dnode, ==, dn); 1462fa9e4066Sahrens ASSERT3U(db->db_blkid, ==, blkid); 1463fa9e4066Sahrens ASSERT3U(db->db_level, ==, level); 1464fa9e4066Sahrens *dbp = db; 1465fa9e4066Sahrens 1466fa9e4066Sahrens return (0); 1467fa9e4066Sahrens } 1468fa9e4066Sahrens 1469fa9e4066Sahrens dmu_buf_impl_t * 1470fa9e4066Sahrens dbuf_hold(dnode_t *dn, uint64_t blkid) 1471fa9e4066Sahrens { 1472fa9e4066Sahrens dmu_buf_impl_t *db; 1473fa9e4066Sahrens (void) dbuf_hold_impl(dn, 0, blkid, FALSE, NULL, &db); 1474fa9e4066Sahrens return (db); 1475fa9e4066Sahrens } 1476fa9e4066Sahrens 1477fa9e4066Sahrens dmu_buf_impl_t * 1478fa9e4066Sahrens dbuf_hold_level(dnode_t *dn, int level, uint64_t blkid, void *tag) 1479fa9e4066Sahrens { 1480fa9e4066Sahrens dmu_buf_impl_t *db; 1481fa9e4066Sahrens (void) dbuf_hold_impl(dn, level, blkid, FALSE, tag, &db); 1482fa9e4066Sahrens return (db); 1483fa9e4066Sahrens } 1484fa9e4066Sahrens 1485fa9e4066Sahrens dmu_buf_impl_t * 1486fa9e4066Sahrens dbuf_hold_bonus(dnode_t *dn, void *tag) 1487fa9e4066Sahrens { 1488fa9e4066Sahrens dmu_buf_impl_t *db; 1489fa9e4066Sahrens rw_enter(&dn->dn_struct_rwlock, RW_READER); 1490fa9e4066Sahrens (void) dbuf_hold_impl(dn, 0, DB_BONUS_BLKID, FALSE, tag, &db); 1491fa9e4066Sahrens rw_exit(&dn->dn_struct_rwlock); 1492fa9e4066Sahrens return (db); 1493fa9e4066Sahrens } 1494fa9e4066Sahrens 1495fa9e4066Sahrens void 1496fa9e4066Sahrens dbuf_add_ref(dmu_buf_impl_t *db, void *tag) 1497fa9e4066Sahrens { 1498fa9e4066Sahrens (void) refcount_add(&db->db_holds, tag); 1499fa9e4066Sahrens /* dprintf_dbuf(db, "adding ref %p; holds up to %lld\n", tag, holds); */ 1500fa9e4066Sahrens } 1501fa9e4066Sahrens 1502fa9e4066Sahrens void 1503fa9e4066Sahrens dbuf_remove_ref(dmu_buf_impl_t *db, void *tag) 1504fa9e4066Sahrens { 1505fa9e4066Sahrens int64_t holds; 1506fa9e4066Sahrens dnode_t *dn = db->db_dnode; 1507fa9e4066Sahrens int need_mutex; 1508fa9e4066Sahrens 1509fa9e4066Sahrens ASSERT(dn != NULL); 1510fa9e4066Sahrens need_mutex = !MUTEX_HELD(&dn->dn_dbufs_mtx); 1511fa9e4066Sahrens 1512fa9e4066Sahrens if (need_mutex) { 1513fa9e4066Sahrens dnode_add_ref(dn, FTAG); 1514fa9e4066Sahrens mutex_enter(&dn->dn_dbufs_mtx); 1515fa9e4066Sahrens } 1516fa9e4066Sahrens 1517fa9e4066Sahrens mutex_enter(&db->db_mtx); 1518*9c9dc39aSek DBUF_VERIFY(db); 1519fa9e4066Sahrens 1520fa9e4066Sahrens holds = refcount_remove(&db->db_holds, tag); 1521fa9e4066Sahrens 1522fa9e4066Sahrens if (holds == 0) { 1523fa9e4066Sahrens ASSERT3U(db->db_state, !=, DB_FILL); 1524fa9e4066Sahrens if (db->db_level == 0 && 1525fa9e4066Sahrens db->db_d.db_user_data_ptr_ptr != NULL) 1526fa9e4066Sahrens *db->db_d.db_user_data_ptr_ptr = NULL; 1527fa9e4066Sahrens dbuf_evict(db); 1528fa9e4066Sahrens } else { 1529fa9e4066Sahrens if (holds == db->db_dirtycnt && 1530fa9e4066Sahrens db->db_level == 0 && db->db_d.db_immediate_evict) 1531fa9e4066Sahrens dbuf_evict_user(db); 1532fa9e4066Sahrens mutex_exit(&db->db_mtx); 1533fa9e4066Sahrens } 1534fa9e4066Sahrens 1535fa9e4066Sahrens if (need_mutex) { 1536fa9e4066Sahrens mutex_exit(&dn->dn_dbufs_mtx); 1537fa9e4066Sahrens dnode_rele(dn, FTAG); 1538fa9e4066Sahrens } 1539fa9e4066Sahrens } 1540fa9e4066Sahrens 1541fa9e4066Sahrens void 1542fa9e4066Sahrens dbuf_rele(dmu_buf_impl_t *db) 1543fa9e4066Sahrens { 1544fa9e4066Sahrens dbuf_remove_ref(db, NULL); 1545fa9e4066Sahrens } 1546fa9e4066Sahrens 1547fa9e4066Sahrens #pragma weak dmu_buf_refcount = dbuf_refcount 1548fa9e4066Sahrens uint64_t 1549fa9e4066Sahrens dbuf_refcount(dmu_buf_impl_t *db) 1550fa9e4066Sahrens { 1551fa9e4066Sahrens return (refcount_count(&db->db_holds)); 1552fa9e4066Sahrens } 1553fa9e4066Sahrens 1554fa9e4066Sahrens void * 1555fa9e4066Sahrens dmu_buf_set_user(dmu_buf_t *db_fake, void *user_ptr, void *user_data_ptr_ptr, 1556fa9e4066Sahrens dmu_buf_evict_func_t *evict_func) 1557fa9e4066Sahrens { 1558fa9e4066Sahrens return (dmu_buf_update_user(db_fake, NULL, user_ptr, 1559fa9e4066Sahrens user_data_ptr_ptr, evict_func)); 1560fa9e4066Sahrens } 1561fa9e4066Sahrens 1562fa9e4066Sahrens void * 1563fa9e4066Sahrens dmu_buf_set_user_ie(dmu_buf_t *db_fake, void *user_ptr, void *user_data_ptr_ptr, 1564fa9e4066Sahrens dmu_buf_evict_func_t *evict_func) 1565fa9e4066Sahrens { 1566fa9e4066Sahrens dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 1567fa9e4066Sahrens 1568fa9e4066Sahrens db->db_d.db_immediate_evict = TRUE; 1569fa9e4066Sahrens return (dmu_buf_update_user(db_fake, NULL, user_ptr, 1570fa9e4066Sahrens user_data_ptr_ptr, evict_func)); 1571fa9e4066Sahrens } 1572fa9e4066Sahrens 1573fa9e4066Sahrens void * 1574fa9e4066Sahrens dmu_buf_update_user(dmu_buf_t *db_fake, void *old_user_ptr, void *user_ptr, 1575fa9e4066Sahrens void *user_data_ptr_ptr, dmu_buf_evict_func_t *evict_func) 1576fa9e4066Sahrens { 1577fa9e4066Sahrens dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 1578fa9e4066Sahrens ASSERT(db->db_level == 0); 1579fa9e4066Sahrens 1580fa9e4066Sahrens ASSERT((user_ptr == NULL) == (evict_func == NULL)); 1581fa9e4066Sahrens 1582fa9e4066Sahrens mutex_enter(&db->db_mtx); 1583fa9e4066Sahrens 1584fa9e4066Sahrens if (db->db_d.db_user_ptr == old_user_ptr) { 1585fa9e4066Sahrens db->db_d.db_user_ptr = user_ptr; 1586fa9e4066Sahrens db->db_d.db_user_data_ptr_ptr = user_data_ptr_ptr; 1587fa9e4066Sahrens db->db_d.db_evict_func = evict_func; 1588fa9e4066Sahrens 1589fa9e4066Sahrens dbuf_update_data(db); 1590fa9e4066Sahrens } else { 1591fa9e4066Sahrens old_user_ptr = db->db_d.db_user_ptr; 1592fa9e4066Sahrens } 1593fa9e4066Sahrens 1594fa9e4066Sahrens mutex_exit(&db->db_mtx); 1595fa9e4066Sahrens return (old_user_ptr); 1596fa9e4066Sahrens } 1597fa9e4066Sahrens 1598fa9e4066Sahrens void * 1599fa9e4066Sahrens dmu_buf_get_user(dmu_buf_t *db_fake) 1600fa9e4066Sahrens { 1601fa9e4066Sahrens dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 1602fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 1603fa9e4066Sahrens 1604fa9e4066Sahrens return (db->db_d.db_user_ptr); 1605fa9e4066Sahrens } 1606fa9e4066Sahrens 1607fa9e4066Sahrens void 1608fa9e4066Sahrens dbuf_sync(dmu_buf_impl_t *db, zio_t *zio, dmu_tx_t *tx) 1609fa9e4066Sahrens { 1610fa9e4066Sahrens arc_buf_t **data; 1611fa9e4066Sahrens uint64_t txg = tx->tx_txg; 1612fa9e4066Sahrens dnode_t *dn = db->db_dnode; 1613fa9e4066Sahrens objset_impl_t *os = dn->dn_objset; 1614fa9e4066Sahrens int blksz; 1615fa9e4066Sahrens 1616fa9e4066Sahrens ASSERT(dmu_tx_is_syncing(tx)); 1617fa9e4066Sahrens 1618fa9e4066Sahrens dprintf_dbuf_bp(db, db->db_blkptr, "blkptr=%p", db->db_blkptr); 1619fa9e4066Sahrens 1620fa9e4066Sahrens mutex_enter(&db->db_mtx); 1621fa9e4066Sahrens /* 1622fa9e4066Sahrens * To be synced, we must be dirtied. But we 1623fa9e4066Sahrens * might have been freed after the dirty. 1624fa9e4066Sahrens */ 1625fa9e4066Sahrens if (db->db_state == DB_UNCACHED) { 1626fa9e4066Sahrens /* This buffer has been freed since it was dirtied */ 1627fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 1628fa9e4066Sahrens } else if (db->db_state == DB_FILL) { 1629fa9e4066Sahrens /* This buffer was freed and is now being re-filled */ 1630fa9e4066Sahrens ASSERT(db->db.db_data != db->db_d.db_data_old[txg&TXG_MASK]); 1631fa9e4066Sahrens } else { 1632fa9e4066Sahrens ASSERT3U(db->db_state, ==, DB_CACHED); 1633fa9e4066Sahrens } 1634*9c9dc39aSek DBUF_VERIFY(db); 1635fa9e4066Sahrens 1636fa9e4066Sahrens /* 1637fa9e4066Sahrens * Don't need a lock on db_dirty (dn_mtx), because it can't 1638fa9e4066Sahrens * be modified yet. 1639fa9e4066Sahrens */ 1640fa9e4066Sahrens 1641fa9e4066Sahrens if (db->db_level == 0) { 1642fa9e4066Sahrens data = &db->db_d.db_data_old[txg&TXG_MASK]; 1643fa9e4066Sahrens blksz = arc_buf_size(*data); 1644fa9e4066Sahrens /* 1645fa9e4066Sahrens * If this buffer is currently "in use" (i.e., there are 1646fa9e4066Sahrens * active holds and db_data still references it), then make 1647fa9e4066Sahrens * a copy before we start the write so that any modifications 1648fa9e4066Sahrens * from the open txg will not leak into this write. 1649fa9e4066Sahrens * 1650fa9e4066Sahrens * NOTE: this copy does not need to be made for objects only 1651fa9e4066Sahrens * modified in the syncing context (e.g. DNONE_DNODE blocks) 1652fa9e4066Sahrens * or if there is no actual write involved (bonus blocks). 1653fa9e4066Sahrens */ 1654fa9e4066Sahrens if (!(dn->dn_object & DMU_PRIVATE_OBJECT) && 1655fa9e4066Sahrens db->db_d.db_overridden_by[txg&TXG_MASK] == NULL && 1656fa9e4066Sahrens db->db_blkid != DB_BONUS_BLKID) { 1657fa9e4066Sahrens if (refcount_count(&db->db_holds) > 1 && 1658fa9e4066Sahrens *data == db->db_buf) { 1659fa9e4066Sahrens *data = arc_buf_alloc( 1660fa9e4066Sahrens db->db_dnode->dn_objset->os_spa, blksz, db); 1661fa9e4066Sahrens bcopy(db->db.db_data, (*data)->b_data, blksz); 1662fa9e4066Sahrens } 1663fa9e4066Sahrens db->db_data_pending = *data; 1664fa9e4066Sahrens } else if (dn->dn_object & DMU_PRIVATE_OBJECT) { 1665fa9e4066Sahrens /* 1666fa9e4066Sahrens * Private object buffers are released here rather 1667fa9e4066Sahrens * than in dbuf_dirty() since they are only modified 1668fa9e4066Sahrens * in the syncing context and we don't want the 1669fa9e4066Sahrens * overhead of making multiple copies of the data. 1670fa9e4066Sahrens */ 1671fa9e4066Sahrens arc_release(db->db_buf, db); 1672fa9e4066Sahrens } 1673fa9e4066Sahrens } else { 1674fa9e4066Sahrens data = &db->db_buf; 1675fa9e4066Sahrens if (*data == NULL) { 1676fa9e4066Sahrens /* 1677fa9e4066Sahrens * This can happen if we dirty and then free 1678fa9e4066Sahrens * the level-0 data blocks in the same txg. So 1679fa9e4066Sahrens * this indirect remains unchanged. 1680fa9e4066Sahrens */ 1681fa9e4066Sahrens if (db->db_dirtied == txg) 1682fa9e4066Sahrens db->db_dirtied = 0; 1683fa9e4066Sahrens ASSERT(db->db_dirtycnt > 0); 1684fa9e4066Sahrens db->db_dirtycnt -= 1; 1685fa9e4066Sahrens mutex_exit(&db->db_mtx); 1686fa9e4066Sahrens dbuf_remove_ref(db, (void *)(uintptr_t)txg); 1687fa9e4066Sahrens return; 1688fa9e4066Sahrens } 1689fa9e4066Sahrens blksz = db->db.db_size; 1690fa9e4066Sahrens ASSERT3U(blksz, ==, 1<<dn->dn_phys->dn_indblkshift); 1691fa9e4066Sahrens } 1692fa9e4066Sahrens 1693fa9e4066Sahrens ASSERT(*data != NULL); 1694fa9e4066Sahrens 1695fa9e4066Sahrens if (db->db_blkid == DB_BONUS_BLKID) { 1696fa9e4066Sahrens /* 1697fa9e4066Sahrens * Simply copy the bonus data into the dnode. It will 1698fa9e4066Sahrens * be written out when the dnode is synced (and it will 1699fa9e4066Sahrens * be synced, since it must have been dirty for dbuf_sync 1700fa9e4066Sahrens * to be called). The bonus data will be byte swapped 1701fa9e4066Sahrens * in dnode_byteswap. 1702fa9e4066Sahrens */ 1703fa9e4066Sahrens /* 1704fa9e4066Sahrens * Use dn_phys->dn_bonuslen since db.db_size is the length 1705fa9e4066Sahrens * of the bonus buffer in the open transaction rather than 1706fa9e4066Sahrens * the syncing transaction. 1707fa9e4066Sahrens */ 1708fa9e4066Sahrens ASSERT3U(db->db_level, ==, 0); 1709fa9e4066Sahrens ASSERT3U(dn->dn_phys->dn_bonuslen, <=, blksz); 1710fa9e4066Sahrens bcopy((*data)->b_data, DN_BONUS(dn->dn_phys), 1711fa9e4066Sahrens dn->dn_phys->dn_bonuslen); 1712fa9e4066Sahrens if (*data != db->db_buf) 1713fa9e4066Sahrens arc_buf_free(*data, db); 1714fa9e4066Sahrens db->db_d.db_data_old[txg&TXG_MASK] = NULL; 1715fa9e4066Sahrens db->db_data_pending = NULL; 1716fa9e4066Sahrens if (db->db_dirtied == txg) 1717fa9e4066Sahrens db->db_dirtied = 0; 1718fa9e4066Sahrens ASSERT(db->db_dirtycnt > 0); 1719fa9e4066Sahrens db->db_dirtycnt -= 1; 1720fa9e4066Sahrens mutex_exit(&db->db_mtx); 1721fa9e4066Sahrens dbuf_remove_ref(db, (void *)(uintptr_t)txg); 1722fa9e4066Sahrens return; 1723fa9e4066Sahrens } else if (db->db_level > 0 && !arc_released(db->db_buf)) { 1724fa9e4066Sahrens /* 1725fa9e4066Sahrens * This indirect buffer was marked dirty, but 1726fa9e4066Sahrens * never modified (if it had been modified, then 1727fa9e4066Sahrens * we would have released the buffer). There is 1728fa9e4066Sahrens * no reason to write anything. 1729fa9e4066Sahrens */ 1730fa9e4066Sahrens db->db_data_pending = NULL; 1731fa9e4066Sahrens if (db->db_dirtied == txg) 1732fa9e4066Sahrens db->db_dirtied = 0; 1733fa9e4066Sahrens ASSERT(db->db_dirtycnt > 0); 1734fa9e4066Sahrens db->db_dirtycnt -= 1; 1735fa9e4066Sahrens mutex_exit(&db->db_mtx); 1736fa9e4066Sahrens dbuf_remove_ref(db, (void *)(uintptr_t)txg); 1737fa9e4066Sahrens return; 1738fa9e4066Sahrens } else if (db->db_blkptr == NULL && 1739fa9e4066Sahrens db->db_level == dn->dn_phys->dn_nlevels-1 && 1740fa9e4066Sahrens db->db_blkid < dn->dn_phys->dn_nblkptr) { 1741fa9e4066Sahrens /* 1742fa9e4066Sahrens * This buffer was allocated at a time when there was 1743fa9e4066Sahrens * no available blkptrs from the dnode, or it was 1744fa9e4066Sahrens * inappropriate to hook it in (i.e., nlevels mis-match). 1745fa9e4066Sahrens */ 1746fa9e4066Sahrens ASSERT(db->db_blkptr == NULL); 1747fa9e4066Sahrens ASSERT(db->db_parent == NULL); 1748fa9e4066Sahrens db->db_parent = dn->dn_dbuf; 1749fa9e4066Sahrens db->db_blkptr = &dn->dn_phys->dn_blkptr[db->db_blkid]; 1750*9c9dc39aSek DBUF_VERIFY(db); 1751fa9e4066Sahrens mutex_exit(&db->db_mtx); 1752fa9e4066Sahrens } else if (db->db_blkptr == NULL) { 1753fa9e4066Sahrens dmu_buf_impl_t *parent = db->db_parent; 1754fa9e4066Sahrens int epbs = dn->dn_phys->dn_indblkshift - SPA_BLKPTRSHIFT; 1755fa9e4066Sahrens 1756fa9e4066Sahrens mutex_exit(&db->db_mtx); 1757fa9e4066Sahrens ASSERT(dn->dn_phys->dn_nlevels > 1); 1758fa9e4066Sahrens if (parent == NULL) { 1759fa9e4066Sahrens rw_enter(&dn->dn_struct_rwlock, RW_READER); 1760fa9e4066Sahrens (void) dbuf_hold_impl(dn, db->db_level+1, 1761fa9e4066Sahrens db->db_blkid >> epbs, FALSE, NULL, &parent); 1762fa9e4066Sahrens rw_exit(&dn->dn_struct_rwlock); 1763fa9e4066Sahrens dbuf_add_ref(parent, db); 1764fa9e4066Sahrens db->db_parent = parent; 1765fa9e4066Sahrens dbuf_rele(parent); 1766fa9e4066Sahrens } 1767fa9e4066Sahrens dbuf_read(parent); 1768fa9e4066Sahrens } else { 1769fa9e4066Sahrens mutex_exit(&db->db_mtx); 1770fa9e4066Sahrens } 1771fa9e4066Sahrens 1772fa9e4066Sahrens ASSERT(IS_DNODE_DNODE(dn->dn_object) || db->db_parent != NULL); 1773fa9e4066Sahrens 1774fa9e4066Sahrens if (db->db_parent != dn->dn_dbuf) { 1775fa9e4066Sahrens dmu_buf_impl_t *parent = db->db_parent; 1776fa9e4066Sahrens int epbs = dn->dn_phys->dn_indblkshift - SPA_BLKPTRSHIFT; 1777fa9e4066Sahrens 1778fa9e4066Sahrens mutex_enter(&db->db_mtx); 1779fa9e4066Sahrens ASSERT(db->db_level == parent->db_level-1); 1780fa9e4066Sahrens ASSERT(list_link_active(&parent->db_dirty_node[txg&TXG_MASK])); 1781fa9e4066Sahrens /* 1782fa9e4066Sahrens * We may have read this block after we dirtied it, 1783fa9e4066Sahrens * so never released it from the cache. 1784fa9e4066Sahrens */ 1785fa9e4066Sahrens arc_release(parent->db_buf, parent); 1786fa9e4066Sahrens 1787fa9e4066Sahrens db->db_blkptr = (blkptr_t *)parent->db.db_data + 1788fa9e4066Sahrens (db->db_blkid & ((1ULL << epbs) - 1)); 1789*9c9dc39aSek DBUF_VERIFY(db); 1790fa9e4066Sahrens mutex_exit(&db->db_mtx); 1791fa9e4066Sahrens } 1792fa9e4066Sahrens ASSERT(db->db_parent == NULL || arc_released(db->db_parent->db_buf)); 1793fa9e4066Sahrens 1794fa9e4066Sahrens #ifdef ZFS_DEBUG 1795fa9e4066Sahrens if (db->db_parent == dn->dn_dbuf) { 1796fa9e4066Sahrens /* 1797fa9e4066Sahrens * We don't need to dnode_setdirty(dn) because if we got 1798fa9e4066Sahrens * here then the parent is already dirty. 1799fa9e4066Sahrens */ 1800fa9e4066Sahrens ASSERT(db->db_level == dn->dn_phys->dn_nlevels-1); 1801fa9e4066Sahrens ASSERT3P(db->db_blkptr, ==, 1802fa9e4066Sahrens &dn->dn_phys->dn_blkptr[db->db_blkid]); 1803fa9e4066Sahrens } 1804fa9e4066Sahrens #endif 1805fa9e4066Sahrens if (db->db_level == 0 && 1806fa9e4066Sahrens db->db_d.db_overridden_by[txg&TXG_MASK] != NULL) { 1807fa9e4066Sahrens arc_buf_t **old = &db->db_d.db_data_old[txg&TXG_MASK]; 1808fa9e4066Sahrens blkptr_t **bpp = &db->db_d.db_overridden_by[txg&TXG_MASK]; 1809fa9e4066Sahrens int old_size = BP_GET_ASIZE(db->db_blkptr); 1810fa9e4066Sahrens int new_size = BP_GET_ASIZE(*bpp); 1811fa9e4066Sahrens 1812fa9e4066Sahrens ASSERT(db->db_blkid != DB_BONUS_BLKID); 1813fa9e4066Sahrens 1814fa9e4066Sahrens dnode_diduse_space(dn, new_size-old_size); 1815fa9e4066Sahrens mutex_enter(&dn->dn_mtx); 1816fa9e4066Sahrens if (db->db_blkid > dn->dn_phys->dn_maxblkid) 1817fa9e4066Sahrens dn->dn_phys->dn_maxblkid = db->db_blkid; 1818fa9e4066Sahrens mutex_exit(&dn->dn_mtx); 1819fa9e4066Sahrens 1820fa9e4066Sahrens dsl_dataset_block_born(os->os_dsl_dataset, *bpp, tx); 1821fa9e4066Sahrens if (!BP_IS_HOLE(db->db_blkptr)) 1822fa9e4066Sahrens dsl_dataset_block_kill(os->os_dsl_dataset, 1823fa9e4066Sahrens db->db_blkptr, os->os_synctx); 1824fa9e4066Sahrens 1825fa9e4066Sahrens mutex_enter(&db->db_mtx); 1826fa9e4066Sahrens *db->db_blkptr = **bpp; 1827fa9e4066Sahrens kmem_free(*bpp, sizeof (blkptr_t)); 1828fa9e4066Sahrens *bpp = NULL; 1829fa9e4066Sahrens 1830fa9e4066Sahrens if (*old != db->db_buf) 1831fa9e4066Sahrens arc_buf_free(*old, db); 1832fa9e4066Sahrens *old = NULL; 1833fa9e4066Sahrens db->db_data_pending = NULL; 1834fa9e4066Sahrens 1835fa9e4066Sahrens cv_broadcast(&db->db_changed); 1836fa9e4066Sahrens 1837fa9e4066Sahrens ASSERT(db->db_dirtycnt > 0); 1838fa9e4066Sahrens db->db_dirtycnt -= 1; 1839fa9e4066Sahrens mutex_exit(&db->db_mtx); 1840fa9e4066Sahrens dbuf_remove_ref(db, (void *)(uintptr_t)txg); 1841fa9e4066Sahrens } else { 1842fa9e4066Sahrens int checksum, compress; 1843fa9e4066Sahrens 1844fa9e4066Sahrens if (db->db_level > 0) { 1845fa9e4066Sahrens /* 1846fa9e4066Sahrens * XXX -- we should design a compression algorithm 1847fa9e4066Sahrens * that specializes in arrays of bps. 1848fa9e4066Sahrens */ 1849fa9e4066Sahrens checksum = ZIO_CHECKSUM_FLETCHER_4; 1850fa9e4066Sahrens compress = ZIO_COMPRESS_LZJB; 1851fa9e4066Sahrens } else { 1852fa9e4066Sahrens /* 1853fa9e4066Sahrens * Allow dnode settings to override objset settings, 1854fa9e4066Sahrens * except for metadata checksums. 1855fa9e4066Sahrens */ 1856fa9e4066Sahrens if (dmu_ot[dn->dn_type].ot_metadata) { 1857fa9e4066Sahrens checksum = os->os_md_checksum; 1858fa9e4066Sahrens compress = zio_compress_select(dn->dn_compress, 1859fa9e4066Sahrens os->os_md_compress); 1860fa9e4066Sahrens } else { 1861fa9e4066Sahrens checksum = zio_checksum_select(dn->dn_checksum, 1862fa9e4066Sahrens os->os_checksum); 1863fa9e4066Sahrens compress = zio_compress_select(dn->dn_compress, 1864fa9e4066Sahrens os->os_compress); 1865fa9e4066Sahrens } 1866fa9e4066Sahrens } 1867fa9e4066Sahrens #ifdef ZFS_DEBUG 1868fa9e4066Sahrens if (db->db_parent) { 1869fa9e4066Sahrens ASSERT(list_link_active( 1870fa9e4066Sahrens &db->db_parent->db_dirty_node[txg&TXG_MASK])); 1871fa9e4066Sahrens ASSERT(db->db_parent == dn->dn_dbuf || 1872fa9e4066Sahrens db->db_parent->db_level > 0); 1873fa9e4066Sahrens if (dn->dn_object & DMU_PRIVATE_OBJECT || 1874fa9e4066Sahrens db->db_level > 0) 1875fa9e4066Sahrens ASSERT(*data == db->db_buf); 1876fa9e4066Sahrens } 1877fa9e4066Sahrens #endif 1878fa9e4066Sahrens ASSERT3U(db->db_blkptr->blk_birth, <=, tx->tx_txg); 1879fa9e4066Sahrens (void) arc_write(zio, os->os_spa, checksum, compress, txg, 1880fa9e4066Sahrens db->db_blkptr, *data, dbuf_write_done, db, 1881fa9e4066Sahrens ZIO_PRIORITY_ASYNC_WRITE, ZIO_FLAG_MUSTSUCCEED, ARC_NOWAIT); 1882fa9e4066Sahrens /* 1883fa9e4066Sahrens * We can't access db after arc_write, since it could finish 1884fa9e4066Sahrens * and be freed, and we have no locks on it. 1885fa9e4066Sahrens */ 1886fa9e4066Sahrens } 1887fa9e4066Sahrens } 1888fa9e4066Sahrens 1889fa9e4066Sahrens struct dbuf_arg { 1890fa9e4066Sahrens objset_impl_t *os; 1891fa9e4066Sahrens blkptr_t bp; 1892fa9e4066Sahrens }; 1893fa9e4066Sahrens 1894fa9e4066Sahrens static void 1895fa9e4066Sahrens dbuf_do_born(void *arg) 1896fa9e4066Sahrens { 1897fa9e4066Sahrens struct dbuf_arg *da = arg; 1898fa9e4066Sahrens dsl_dataset_block_born(da->os->os_dsl_dataset, 1899fa9e4066Sahrens &da->bp, da->os->os_synctx); 1900fa9e4066Sahrens kmem_free(da, sizeof (struct dbuf_arg)); 1901fa9e4066Sahrens } 1902fa9e4066Sahrens 1903fa9e4066Sahrens static void 1904fa9e4066Sahrens dbuf_do_kill(void *arg) 1905fa9e4066Sahrens { 1906fa9e4066Sahrens struct dbuf_arg *da = arg; 1907fa9e4066Sahrens dsl_dataset_block_kill(da->os->os_dsl_dataset, 1908fa9e4066Sahrens &da->bp, da->os->os_synctx); 1909fa9e4066Sahrens kmem_free(da, sizeof (struct dbuf_arg)); 1910fa9e4066Sahrens } 1911fa9e4066Sahrens 1912fa9e4066Sahrens /* ARGSUSED */ 1913fa9e4066Sahrens static void 1914fa9e4066Sahrens dbuf_write_done(zio_t *zio, arc_buf_t *buf, void *vdb) 1915fa9e4066Sahrens { 1916fa9e4066Sahrens dmu_buf_impl_t *db = vdb; 1917fa9e4066Sahrens dnode_t *dn = db->db_dnode; 1918fa9e4066Sahrens objset_impl_t *os = dn->dn_objset; 1919fa9e4066Sahrens uint64_t txg = zio->io_txg; 1920fa9e4066Sahrens uint64_t fill = 0; 1921fa9e4066Sahrens int i; 1922fa9e4066Sahrens int old_size, new_size; 1923fa9e4066Sahrens 1924fa9e4066Sahrens ASSERT3U(zio->io_error, ==, 0); 1925fa9e4066Sahrens 1926fa9e4066Sahrens dprintf_dbuf_bp(db, &zio->io_bp_orig, "bp_orig: %s", ""); 1927fa9e4066Sahrens 1928fa9e4066Sahrens old_size = BP_GET_ASIZE(&zio->io_bp_orig); 1929fa9e4066Sahrens new_size = BP_GET_ASIZE(zio->io_bp); 1930fa9e4066Sahrens 1931fa9e4066Sahrens dnode_diduse_space(dn, new_size-old_size); 1932fa9e4066Sahrens 1933fa9e4066Sahrens mutex_enter(&db->db_mtx); 1934fa9e4066Sahrens 1935fa9e4066Sahrens if (db->db_dirtied == txg) 1936fa9e4066Sahrens db->db_dirtied = 0; 1937fa9e4066Sahrens 1938fa9e4066Sahrens if (db->db_level == 0) { 1939fa9e4066Sahrens arc_buf_t **old = &db->db_d.db_data_old[txg&TXG_MASK]; 1940fa9e4066Sahrens 1941fa9e4066Sahrens ASSERT(db->db_blkid != DB_BONUS_BLKID); 1942fa9e4066Sahrens 1943fa9e4066Sahrens if (*old != db->db_buf) 1944fa9e4066Sahrens arc_buf_free(*old, db); 1945fa9e4066Sahrens *old = NULL; 1946fa9e4066Sahrens db->db_data_pending = NULL; 1947fa9e4066Sahrens 1948fa9e4066Sahrens mutex_enter(&dn->dn_mtx); 1949fa9e4066Sahrens if (db->db_blkid > dn->dn_phys->dn_maxblkid && 1950fa9e4066Sahrens !BP_IS_HOLE(db->db_blkptr)) 1951fa9e4066Sahrens dn->dn_phys->dn_maxblkid = db->db_blkid; 1952fa9e4066Sahrens mutex_exit(&dn->dn_mtx); 1953fa9e4066Sahrens 1954fa9e4066Sahrens if (dn->dn_type == DMU_OT_DNODE) { 1955fa9e4066Sahrens dnode_phys_t *dnp = db->db.db_data; 1956fa9e4066Sahrens for (i = db->db.db_size >> DNODE_SHIFT; i > 0; 1957fa9e4066Sahrens i--, dnp++) { 1958fa9e4066Sahrens if (dnp->dn_type != DMU_OT_NONE) 1959fa9e4066Sahrens fill++; 1960fa9e4066Sahrens } 1961fa9e4066Sahrens } else { 1962fa9e4066Sahrens if (!BP_IS_HOLE(db->db_blkptr)) 1963fa9e4066Sahrens fill = 1; 1964fa9e4066Sahrens } 1965fa9e4066Sahrens } else { 1966fa9e4066Sahrens blkptr_t *bp = db->db.db_data; 1967fa9e4066Sahrens ASSERT3U(db->db.db_size, ==, 1<<dn->dn_phys->dn_indblkshift); 1968fa9e4066Sahrens if (!BP_IS_HOLE(db->db_blkptr)) { 1969fa9e4066Sahrens ASSERT3U(BP_GET_LSIZE(zio->io_bp), ==, db->db.db_size); 1970fa9e4066Sahrens ASSERT3U(BP_GET_LSIZE(db->db_blkptr), ==, 1971fa9e4066Sahrens db->db.db_size); 1972fa9e4066Sahrens } 1973fa9e4066Sahrens for (i = db->db.db_size >> SPA_BLKPTRSHIFT; i > 0; i--, bp++) { 1974fa9e4066Sahrens if (BP_IS_HOLE(bp)) 1975fa9e4066Sahrens continue; 1976fa9e4066Sahrens ASSERT3U(BP_GET_LSIZE(bp), ==, 1977fa9e4066Sahrens db->db_level == 1 ? dn->dn_datablksz : 1978fa9e4066Sahrens (1<<dn->dn_phys->dn_indblkshift)); 1979fa9e4066Sahrens fill += bp->blk_fill; 1980fa9e4066Sahrens } 1981fa9e4066Sahrens } 1982fa9e4066Sahrens 1983fa9e4066Sahrens if (!BP_IS_HOLE(db->db_blkptr)) { 1984fa9e4066Sahrens db->db_blkptr->blk_fill = fill; 1985fa9e4066Sahrens BP_SET_TYPE(db->db_blkptr, dn->dn_type); 1986fa9e4066Sahrens BP_SET_LEVEL(db->db_blkptr, db->db_level); 1987fa9e4066Sahrens } else { 1988fa9e4066Sahrens ASSERT3U(fill, ==, 0); 1989fa9e4066Sahrens ASSERT3U(db->db_blkptr->blk_fill, ==, 0); 1990fa9e4066Sahrens } 1991fa9e4066Sahrens 1992fa9e4066Sahrens dprintf_dbuf_bp(db, db->db_blkptr, 1993fa9e4066Sahrens "wrote %llu bytes to blkptr:", zio->io_size); 1994fa9e4066Sahrens 1995fa9e4066Sahrens ASSERT(db->db_parent == NULL || 1996fa9e4066Sahrens list_link_active(&db->db_parent->db_dirty_node[txg&TXG_MASK])); 1997fa9e4066Sahrens cv_broadcast(&db->db_changed); 1998fa9e4066Sahrens ASSERT(db->db_dirtycnt > 0); 1999fa9e4066Sahrens db->db_dirtycnt -= 1; 2000fa9e4066Sahrens mutex_exit(&db->db_mtx); 2001fa9e4066Sahrens 2002fa9e4066Sahrens /* We must do this after we've set the bp's type and level */ 2003fa9e4066Sahrens if (!DVA_EQUAL(BP_IDENTITY(zio->io_bp), 2004fa9e4066Sahrens BP_IDENTITY(&zio->io_bp_orig))) { 2005fa9e4066Sahrens struct dbuf_arg *da; 2006fa9e4066Sahrens da = kmem_alloc(sizeof (struct dbuf_arg), KM_SLEEP); 2007fa9e4066Sahrens da->os = os; 2008fa9e4066Sahrens da->bp = *zio->io_bp; 2009fa9e4066Sahrens (void) taskq_dispatch(dbuf_tq, dbuf_do_born, da, 0); 2010fa9e4066Sahrens if (!BP_IS_HOLE(&zio->io_bp_orig)) { 2011fa9e4066Sahrens da = kmem_alloc(sizeof (struct dbuf_arg), KM_SLEEP); 2012fa9e4066Sahrens da->os = os; 2013fa9e4066Sahrens da->bp = zio->io_bp_orig; 2014fa9e4066Sahrens (void) taskq_dispatch(dbuf_tq, dbuf_do_kill, da, 0); 2015fa9e4066Sahrens } 2016fa9e4066Sahrens } 2017fa9e4066Sahrens 2018fa9e4066Sahrens dbuf_remove_ref(db, (void *)(uintptr_t)txg); 2019fa9e4066Sahrens } 2020