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 /* 2206e0070dSMark Shellenbaum * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 233f2366c2SGordon Ross * Copyright 2011 Nexenta Systems, Inc. All rights reserved. 24ad135b5dSChristopher Siden * Copyright (c) 2012 by Delphix. All rights reserved. 25fa9e4066Sahrens */ 26fa9e4066Sahrens 27fa9e4066Sahrens #include <sys/zfs_context.h> 28fa9e4066Sahrens #include <sys/dmu.h> 29fa9e4066Sahrens #include <sys/dmu_impl.h> 30fa9e4066Sahrens #include <sys/dbuf.h> 31fa9e4066Sahrens #include <sys/dmu_objset.h> 32fa9e4066Sahrens #include <sys/dsl_dataset.h> 33fa9e4066Sahrens #include <sys/dsl_dir.h> 34fa9e4066Sahrens #include <sys/dmu_tx.h> 35fa9e4066Sahrens #include <sys/spa.h> 36fa9e4066Sahrens #include <sys/zio.h> 37fa9e4066Sahrens #include <sys/dmu_zfetch.h> 380a586ceaSMark Shellenbaum #include <sys/sa.h> 390a586ceaSMark Shellenbaum #include <sys/sa_impl.h> 40fa9e4066Sahrens 41fa9e4066Sahrens static void dbuf_destroy(dmu_buf_impl_t *db); 42*3b2aab18SMatthew Ahrens static boolean_t dbuf_undirty(dmu_buf_impl_t *db, dmu_tx_t *tx); 43088f3894Sahrens static void dbuf_write(dbuf_dirty_record_t *dr, arc_buf_t *data, dmu_tx_t *tx); 44fa9e4066Sahrens 45fa9e4066Sahrens /* 46fa9e4066Sahrens * Global data structures and functions for the dbuf cache. 47fa9e4066Sahrens */ 48fa9e4066Sahrens static kmem_cache_t *dbuf_cache; 49fa9e4066Sahrens 50fa9e4066Sahrens /* ARGSUSED */ 51fa9e4066Sahrens static int 52fa9e4066Sahrens dbuf_cons(void *vdb, void *unused, int kmflag) 53fa9e4066Sahrens { 54fa9e4066Sahrens dmu_buf_impl_t *db = vdb; 55fa9e4066Sahrens bzero(db, sizeof (dmu_buf_impl_t)); 56fa9e4066Sahrens 57fa9e4066Sahrens mutex_init(&db->db_mtx, NULL, MUTEX_DEFAULT, NULL); 58fa9e4066Sahrens cv_init(&db->db_changed, NULL, CV_DEFAULT, NULL); 59fa9e4066Sahrens refcount_create(&db->db_holds); 60fa9e4066Sahrens return (0); 61fa9e4066Sahrens } 62fa9e4066Sahrens 63fa9e4066Sahrens /* ARGSUSED */ 64fa9e4066Sahrens static void 65fa9e4066Sahrens dbuf_dest(void *vdb, void *unused) 66fa9e4066Sahrens { 67fa9e4066Sahrens dmu_buf_impl_t *db = vdb; 68fa9e4066Sahrens mutex_destroy(&db->db_mtx); 69fa9e4066Sahrens cv_destroy(&db->db_changed); 70fa9e4066Sahrens refcount_destroy(&db->db_holds); 71fa9e4066Sahrens } 72fa9e4066Sahrens 73fa9e4066Sahrens /* 74fa9e4066Sahrens * dbuf hash table routines 75fa9e4066Sahrens */ 76fa9e4066Sahrens static dbuf_hash_table_t dbuf_hash_table; 77fa9e4066Sahrens 78fa9e4066Sahrens static uint64_t dbuf_hash_count; 79fa9e4066Sahrens 80fa9e4066Sahrens static uint64_t 81fa9e4066Sahrens dbuf_hash(void *os, uint64_t obj, uint8_t lvl, uint64_t blkid) 82fa9e4066Sahrens { 83fa9e4066Sahrens uintptr_t osv = (uintptr_t)os; 84fa9e4066Sahrens uint64_t crc = -1ULL; 85fa9e4066Sahrens 86fa9e4066Sahrens ASSERT(zfs_crc64_table[128] == ZFS_CRC64_POLY); 87fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (lvl)) & 0xFF]; 88fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (osv >> 6)) & 0xFF]; 89fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (obj >> 0)) & 0xFF]; 90fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (obj >> 8)) & 0xFF]; 91fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (blkid >> 0)) & 0xFF]; 92fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (blkid >> 8)) & 0xFF]; 93fa9e4066Sahrens 94fa9e4066Sahrens crc ^= (osv>>14) ^ (obj>>16) ^ (blkid>>16); 95fa9e4066Sahrens 96fa9e4066Sahrens return (crc); 97fa9e4066Sahrens } 98fa9e4066Sahrens 99fa9e4066Sahrens #define DBUF_HASH(os, obj, level, blkid) dbuf_hash(os, obj, level, blkid); 100fa9e4066Sahrens 101fa9e4066Sahrens #define DBUF_EQUAL(dbuf, os, obj, level, blkid) \ 102fa9e4066Sahrens ((dbuf)->db.db_object == (obj) && \ 103fa9e4066Sahrens (dbuf)->db_objset == (os) && \ 104fa9e4066Sahrens (dbuf)->db_level == (level) && \ 105fa9e4066Sahrens (dbuf)->db_blkid == (blkid)) 106fa9e4066Sahrens 107fa9e4066Sahrens dmu_buf_impl_t * 108fa9e4066Sahrens dbuf_find(dnode_t *dn, uint8_t level, uint64_t blkid) 109fa9e4066Sahrens { 110fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 111503ad85cSMatthew Ahrens objset_t *os = dn->dn_objset; 112fa9e4066Sahrens uint64_t obj = dn->dn_object; 113fa9e4066Sahrens uint64_t hv = DBUF_HASH(os, obj, level, blkid); 114fa9e4066Sahrens uint64_t idx = hv & h->hash_table_mask; 115fa9e4066Sahrens dmu_buf_impl_t *db; 116fa9e4066Sahrens 117fa9e4066Sahrens mutex_enter(DBUF_HASH_MUTEX(h, idx)); 118fa9e4066Sahrens for (db = h->hash_table[idx]; db != NULL; db = db->db_hash_next) { 119fa9e4066Sahrens if (DBUF_EQUAL(db, os, obj, level, blkid)) { 120fa9e4066Sahrens mutex_enter(&db->db_mtx); 121ea8dc4b6Seschrock if (db->db_state != DB_EVICTING) { 122fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 123fa9e4066Sahrens return (db); 124fa9e4066Sahrens } 125fa9e4066Sahrens mutex_exit(&db->db_mtx); 126fa9e4066Sahrens } 127fa9e4066Sahrens } 128fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 129fa9e4066Sahrens return (NULL); 130fa9e4066Sahrens } 131fa9e4066Sahrens 132fa9e4066Sahrens /* 133fa9e4066Sahrens * Insert an entry into the hash table. If there is already an element 134fa9e4066Sahrens * equal to elem in the hash table, then the already existing element 135fa9e4066Sahrens * will be returned and the new element will not be inserted. 136fa9e4066Sahrens * Otherwise returns NULL. 137fa9e4066Sahrens */ 138fa9e4066Sahrens static dmu_buf_impl_t * 139fa9e4066Sahrens dbuf_hash_insert(dmu_buf_impl_t *db) 140fa9e4066Sahrens { 141fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 142503ad85cSMatthew Ahrens objset_t *os = db->db_objset; 143fa9e4066Sahrens uint64_t obj = db->db.db_object; 144fa9e4066Sahrens int level = db->db_level; 145fa9e4066Sahrens uint64_t blkid = db->db_blkid; 146fa9e4066Sahrens uint64_t hv = DBUF_HASH(os, obj, level, blkid); 147fa9e4066Sahrens uint64_t idx = hv & h->hash_table_mask; 148fa9e4066Sahrens dmu_buf_impl_t *dbf; 149fa9e4066Sahrens 150fa9e4066Sahrens mutex_enter(DBUF_HASH_MUTEX(h, idx)); 151fa9e4066Sahrens for (dbf = h->hash_table[idx]; dbf != NULL; dbf = dbf->db_hash_next) { 152fa9e4066Sahrens if (DBUF_EQUAL(dbf, os, obj, level, blkid)) { 153fa9e4066Sahrens mutex_enter(&dbf->db_mtx); 154ea8dc4b6Seschrock if (dbf->db_state != DB_EVICTING) { 155fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 156fa9e4066Sahrens return (dbf); 157fa9e4066Sahrens } 158fa9e4066Sahrens mutex_exit(&dbf->db_mtx); 159fa9e4066Sahrens } 160fa9e4066Sahrens } 161fa9e4066Sahrens 162fa9e4066Sahrens mutex_enter(&db->db_mtx); 163fa9e4066Sahrens db->db_hash_next = h->hash_table[idx]; 164fa9e4066Sahrens h->hash_table[idx] = db; 165fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 166fa9e4066Sahrens atomic_add_64(&dbuf_hash_count, 1); 167fa9e4066Sahrens 168fa9e4066Sahrens return (NULL); 169fa9e4066Sahrens } 170fa9e4066Sahrens 171fa9e4066Sahrens /* 172fa9e4066Sahrens * Remove an entry from the hash table. This operation will 173fa9e4066Sahrens * fail if there are any existing holds on the db. 174fa9e4066Sahrens */ 175fa9e4066Sahrens static void 176fa9e4066Sahrens dbuf_hash_remove(dmu_buf_impl_t *db) 177fa9e4066Sahrens { 178fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 179fa9e4066Sahrens uint64_t hv = DBUF_HASH(db->db_objset, db->db.db_object, 180fa9e4066Sahrens db->db_level, db->db_blkid); 181fa9e4066Sahrens uint64_t idx = hv & h->hash_table_mask; 182fa9e4066Sahrens dmu_buf_impl_t *dbf, **dbp; 183fa9e4066Sahrens 184fa9e4066Sahrens /* 185fa9e4066Sahrens * We musn't hold db_mtx to maintin lock ordering: 186fa9e4066Sahrens * DBUF_HASH_MUTEX > db_mtx. 187fa9e4066Sahrens */ 188fa9e4066Sahrens ASSERT(refcount_is_zero(&db->db_holds)); 189ea8dc4b6Seschrock ASSERT(db->db_state == DB_EVICTING); 190fa9e4066Sahrens ASSERT(!MUTEX_HELD(&db->db_mtx)); 191fa9e4066Sahrens 192fa9e4066Sahrens mutex_enter(DBUF_HASH_MUTEX(h, idx)); 193fa9e4066Sahrens dbp = &h->hash_table[idx]; 194fa9e4066Sahrens while ((dbf = *dbp) != db) { 195fa9e4066Sahrens dbp = &dbf->db_hash_next; 196fa9e4066Sahrens ASSERT(dbf != NULL); 197fa9e4066Sahrens } 198fa9e4066Sahrens *dbp = db->db_hash_next; 199fa9e4066Sahrens db->db_hash_next = NULL; 200fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 201fa9e4066Sahrens atomic_add_64(&dbuf_hash_count, -1); 202fa9e4066Sahrens } 203fa9e4066Sahrens 204ea8dc4b6Seschrock static arc_evict_func_t dbuf_do_evict; 205fa9e4066Sahrens 206fa9e4066Sahrens static void 207fa9e4066Sahrens dbuf_evict_user(dmu_buf_impl_t *db) 208fa9e4066Sahrens { 209fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 210fa9e4066Sahrens 211c717a561Smaybee if (db->db_level != 0 || db->db_evict_func == NULL) 212fa9e4066Sahrens return; 213fa9e4066Sahrens 214c717a561Smaybee if (db->db_user_data_ptr_ptr) 215c717a561Smaybee *db->db_user_data_ptr_ptr = db->db.db_data; 216c717a561Smaybee db->db_evict_func(&db->db, db->db_user_ptr); 217c717a561Smaybee db->db_user_ptr = NULL; 218c717a561Smaybee db->db_user_data_ptr_ptr = NULL; 219c717a561Smaybee db->db_evict_func = NULL; 220fa9e4066Sahrens } 221fa9e4066Sahrens 222744947dcSTom Erickson boolean_t 223744947dcSTom Erickson dbuf_is_metadata(dmu_buf_impl_t *db) 224744947dcSTom Erickson { 225744947dcSTom Erickson if (db->db_level > 0) { 226744947dcSTom Erickson return (B_TRUE); 227744947dcSTom Erickson } else { 228744947dcSTom Erickson boolean_t is_metadata; 229744947dcSTom Erickson 230744947dcSTom Erickson DB_DNODE_ENTER(db); 231ad135b5dSChristopher Siden is_metadata = DMU_OT_IS_METADATA(DB_DNODE(db)->dn_type); 232744947dcSTom Erickson DB_DNODE_EXIT(db); 233744947dcSTom Erickson 234744947dcSTom Erickson return (is_metadata); 235744947dcSTom Erickson } 236744947dcSTom Erickson } 237744947dcSTom Erickson 238ea8dc4b6Seschrock void 239ea8dc4b6Seschrock dbuf_evict(dmu_buf_impl_t *db) 240ea8dc4b6Seschrock { 241ea8dc4b6Seschrock ASSERT(MUTEX_HELD(&db->db_mtx)); 242ea8dc4b6Seschrock ASSERT(db->db_buf == NULL); 243c717a561Smaybee ASSERT(db->db_data_pending == NULL); 244ea8dc4b6Seschrock 245ea8dc4b6Seschrock dbuf_clear(db); 246ea8dc4b6Seschrock dbuf_destroy(db); 247ea8dc4b6Seschrock } 248ea8dc4b6Seschrock 249fa9e4066Sahrens void 250fa9e4066Sahrens dbuf_init(void) 251fa9e4066Sahrens { 252ea8dc4b6Seschrock uint64_t hsize = 1ULL << 16; 253fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 254fa9e4066Sahrens int i; 255fa9e4066Sahrens 256fa9e4066Sahrens /* 257fa9e4066Sahrens * The hash table is big enough to fill all of physical memory 258ea8dc4b6Seschrock * with an average 4K block size. The table will take up 259ea8dc4b6Seschrock * totalmem*sizeof(void*)/4K (i.e. 2MB/GB with 8-byte pointers). 260fa9e4066Sahrens */ 261ea8dc4b6Seschrock while (hsize * 4096 < physmem * PAGESIZE) 262fa9e4066Sahrens hsize <<= 1; 263fa9e4066Sahrens 264ea8dc4b6Seschrock retry: 265fa9e4066Sahrens h->hash_table_mask = hsize - 1; 266ea8dc4b6Seschrock h->hash_table = kmem_zalloc(hsize * sizeof (void *), KM_NOSLEEP); 267ea8dc4b6Seschrock if (h->hash_table == NULL) { 268ea8dc4b6Seschrock /* XXX - we should really return an error instead of assert */ 269ea8dc4b6Seschrock ASSERT(hsize > (1ULL << 10)); 270ea8dc4b6Seschrock hsize >>= 1; 271ea8dc4b6Seschrock goto retry; 272ea8dc4b6Seschrock } 273fa9e4066Sahrens 274fa9e4066Sahrens dbuf_cache = kmem_cache_create("dmu_buf_impl_t", 275fa9e4066Sahrens sizeof (dmu_buf_impl_t), 276fa9e4066Sahrens 0, dbuf_cons, dbuf_dest, NULL, NULL, NULL, 0); 277fa9e4066Sahrens 278fa9e4066Sahrens for (i = 0; i < DBUF_MUTEXES; i++) 279fa9e4066Sahrens mutex_init(&h->hash_mutexes[i], NULL, MUTEX_DEFAULT, NULL); 280fa9e4066Sahrens } 281fa9e4066Sahrens 282fa9e4066Sahrens void 283fa9e4066Sahrens dbuf_fini(void) 284fa9e4066Sahrens { 285fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 286fa9e4066Sahrens int i; 287fa9e4066Sahrens 288fa9e4066Sahrens for (i = 0; i < DBUF_MUTEXES; i++) 289fa9e4066Sahrens mutex_destroy(&h->hash_mutexes[i]); 290fa9e4066Sahrens kmem_free(h->hash_table, (h->hash_table_mask + 1) * sizeof (void *)); 291fa9e4066Sahrens kmem_cache_destroy(dbuf_cache); 292fa9e4066Sahrens } 293fa9e4066Sahrens 294fa9e4066Sahrens /* 295fa9e4066Sahrens * Other stuff. 296fa9e4066Sahrens */ 297fa9e4066Sahrens 2989c9dc39aSek #ifdef ZFS_DEBUG 299fa9e4066Sahrens static void 300fa9e4066Sahrens dbuf_verify(dmu_buf_impl_t *db) 301fa9e4066Sahrens { 302744947dcSTom Erickson dnode_t *dn; 303b24ab676SJeff Bonwick dbuf_dirty_record_t *dr; 304fa9e4066Sahrens 305fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 306fa9e4066Sahrens 307fa9e4066Sahrens if (!(zfs_flags & ZFS_DEBUG_DBUF_VERIFY)) 308fa9e4066Sahrens return; 309fa9e4066Sahrens 310fa9e4066Sahrens ASSERT(db->db_objset != NULL); 311744947dcSTom Erickson DB_DNODE_ENTER(db); 312744947dcSTom Erickson dn = DB_DNODE(db); 313fa9e4066Sahrens if (dn == NULL) { 314fa9e4066Sahrens ASSERT(db->db_parent == NULL); 315fa9e4066Sahrens ASSERT(db->db_blkptr == NULL); 316fa9e4066Sahrens } else { 317fa9e4066Sahrens ASSERT3U(db->db.db_object, ==, dn->dn_object); 318fa9e4066Sahrens ASSERT3P(db->db_objset, ==, dn->dn_objset); 319fa9e4066Sahrens ASSERT3U(db->db_level, <, dn->dn_nlevels); 320744947dcSTom Erickson ASSERT(db->db_blkid == DMU_BONUS_BLKID || 321744947dcSTom Erickson db->db_blkid == DMU_SPILL_BLKID || 322744947dcSTom Erickson !list_is_empty(&dn->dn_dbufs)); 323fa9e4066Sahrens } 3240a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 325fa9e4066Sahrens ASSERT(dn != NULL); 3261934e92fSmaybee ASSERT3U(db->db.db_size, >=, dn->dn_bonuslen); 3270a586ceaSMark Shellenbaum ASSERT3U(db->db.db_offset, ==, DMU_BONUS_BLKID); 3280a586ceaSMark Shellenbaum } else if (db->db_blkid == DMU_SPILL_BLKID) { 3290a586ceaSMark Shellenbaum ASSERT(dn != NULL); 3300a586ceaSMark Shellenbaum ASSERT3U(db->db.db_size, >=, dn->dn_bonuslen); 331fb09f5aaSMadhav Suresh ASSERT0(db->db.db_offset); 332fa9e4066Sahrens } else { 333fa9e4066Sahrens ASSERT3U(db->db.db_offset, ==, db->db_blkid * db->db.db_size); 334fa9e4066Sahrens } 335fa9e4066Sahrens 336b24ab676SJeff Bonwick for (dr = db->db_data_pending; dr != NULL; dr = dr->dr_next) 337b24ab676SJeff Bonwick ASSERT(dr->dr_dbuf == db); 338b24ab676SJeff Bonwick 339b24ab676SJeff Bonwick for (dr = db->db_last_dirty; dr != NULL; dr = dr->dr_next) 340b24ab676SJeff Bonwick ASSERT(dr->dr_dbuf == db); 341b24ab676SJeff Bonwick 34288b7b0f2SMatthew Ahrens /* 34388b7b0f2SMatthew Ahrens * We can't assert that db_size matches dn_datablksz because it 34488b7b0f2SMatthew Ahrens * can be momentarily different when another thread is doing 34588b7b0f2SMatthew Ahrens * dnode_set_blksz(). 34688b7b0f2SMatthew Ahrens */ 34788b7b0f2SMatthew Ahrens if (db->db_level == 0 && db->db.db_object == DMU_META_DNODE_OBJECT) { 348b24ab676SJeff Bonwick dr = db->db_data_pending; 34988b7b0f2SMatthew Ahrens /* 35088b7b0f2SMatthew Ahrens * It should only be modified in syncing context, so 35188b7b0f2SMatthew Ahrens * make sure we only have one copy of the data. 35288b7b0f2SMatthew Ahrens */ 35388b7b0f2SMatthew Ahrens ASSERT(dr == NULL || dr->dt.dl.dr_data == db->db_buf); 354fa9e4066Sahrens } 355fa9e4066Sahrens 356fa9e4066Sahrens /* verify db->db_blkptr */ 357fa9e4066Sahrens if (db->db_blkptr) { 358fa9e4066Sahrens if (db->db_parent == dn->dn_dbuf) { 359fa9e4066Sahrens /* db is pointed to by the dnode */ 360fa9e4066Sahrens /* ASSERT3U(db->db_blkid, <, dn->dn_nblkptr); */ 36114843421SMatthew Ahrens if (DMU_OBJECT_IS_SPECIAL(db->db.db_object)) 362fa9e4066Sahrens ASSERT(db->db_parent == NULL); 363fa9e4066Sahrens else 364fa9e4066Sahrens ASSERT(db->db_parent != NULL); 3650a586ceaSMark Shellenbaum if (db->db_blkid != DMU_SPILL_BLKID) 3660a586ceaSMark Shellenbaum ASSERT3P(db->db_blkptr, ==, 3670a586ceaSMark Shellenbaum &dn->dn_phys->dn_blkptr[db->db_blkid]); 368fa9e4066Sahrens } else { 369fa9e4066Sahrens /* db is pointed to by an indirect block */ 370fa9e4066Sahrens int epb = db->db_parent->db.db_size >> SPA_BLKPTRSHIFT; 371fa9e4066Sahrens ASSERT3U(db->db_parent->db_level, ==, db->db_level+1); 372fa9e4066Sahrens ASSERT3U(db->db_parent->db.db_object, ==, 373fa9e4066Sahrens db->db.db_object); 374fa9e4066Sahrens /* 375fa9e4066Sahrens * dnode_grow_indblksz() can make this fail if we don't 376fa9e4066Sahrens * have the struct_rwlock. XXX indblksz no longer 377fa9e4066Sahrens * grows. safe to do this now? 378fa9e4066Sahrens */ 379744947dcSTom Erickson if (RW_WRITE_HELD(&dn->dn_struct_rwlock)) { 380fa9e4066Sahrens ASSERT3P(db->db_blkptr, ==, 381fa9e4066Sahrens ((blkptr_t *)db->db_parent->db.db_data + 382fa9e4066Sahrens db->db_blkid % epb)); 383fa9e4066Sahrens } 384fa9e4066Sahrens } 385fa9e4066Sahrens } 386fa9e4066Sahrens if ((db->db_blkptr == NULL || BP_IS_HOLE(db->db_blkptr)) && 3873f9d6ad7SLin Ling (db->db_buf == NULL || db->db_buf->b_data) && 3880a586ceaSMark Shellenbaum db->db.db_data && db->db_blkid != DMU_BONUS_BLKID && 389fa9e4066Sahrens db->db_state != DB_FILL && !dn->dn_free_txg) { 390fa9e4066Sahrens /* 391fa9e4066Sahrens * If the blkptr isn't set but they have nonzero data, 392fa9e4066Sahrens * it had better be dirty, otherwise we'll lose that 393fa9e4066Sahrens * data when we evict this buffer. 394fa9e4066Sahrens */ 395fa9e4066Sahrens if (db->db_dirtycnt == 0) { 396fa9e4066Sahrens uint64_t *buf = db->db.db_data; 397fa9e4066Sahrens int i; 398fa9e4066Sahrens 399fa9e4066Sahrens for (i = 0; i < db->db.db_size >> 3; i++) { 400fa9e4066Sahrens ASSERT(buf[i] == 0); 401fa9e4066Sahrens } 402fa9e4066Sahrens } 403fa9e4066Sahrens } 404744947dcSTom Erickson DB_DNODE_EXIT(db); 405fa9e4066Sahrens } 4069c9dc39aSek #endif 407fa9e4066Sahrens 408fa9e4066Sahrens static void 409fa9e4066Sahrens dbuf_update_data(dmu_buf_impl_t *db) 410fa9e4066Sahrens { 411fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 412c717a561Smaybee if (db->db_level == 0 && db->db_user_data_ptr_ptr) { 413fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 414c717a561Smaybee *db->db_user_data_ptr_ptr = db->db.db_data; 415fa9e4066Sahrens } 416fa9e4066Sahrens } 417fa9e4066Sahrens 418fa9e4066Sahrens static void 419fa9e4066Sahrens dbuf_set_data(dmu_buf_impl_t *db, arc_buf_t *buf) 420fa9e4066Sahrens { 421fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 422ea8dc4b6Seschrock ASSERT(db->db_buf == NULL || !arc_has_callback(db->db_buf)); 423fa9e4066Sahrens db->db_buf = buf; 424ea8dc4b6Seschrock if (buf != NULL) { 425ea8dc4b6Seschrock ASSERT(buf->b_data != NULL); 426ea8dc4b6Seschrock db->db.db_data = buf->b_data; 427ea8dc4b6Seschrock if (!arc_released(buf)) 428ea8dc4b6Seschrock arc_set_callback(buf, dbuf_do_evict, db); 429ea8dc4b6Seschrock dbuf_update_data(db); 430ea8dc4b6Seschrock } else { 431ea8dc4b6Seschrock dbuf_evict_user(db); 432ea8dc4b6Seschrock db->db.db_data = NULL; 43382c9918fSTim Haley if (db->db_state != DB_NOFILL) 43482c9918fSTim Haley db->db_state = DB_UNCACHED; 435ea8dc4b6Seschrock } 436fa9e4066Sahrens } 437fa9e4066Sahrens 438c242f9a0Schunli zhang - Sun Microsystems - Irvine United States /* 439c242f9a0Schunli zhang - Sun Microsystems - Irvine United States * Loan out an arc_buf for read. Return the loaned arc_buf. 440c242f9a0Schunli zhang - Sun Microsystems - Irvine United States */ 441c242f9a0Schunli zhang - Sun Microsystems - Irvine United States arc_buf_t * 442c242f9a0Schunli zhang - Sun Microsystems - Irvine United States dbuf_loan_arcbuf(dmu_buf_impl_t *db) 443c242f9a0Schunli zhang - Sun Microsystems - Irvine United States { 444c242f9a0Schunli zhang - Sun Microsystems - Irvine United States arc_buf_t *abuf; 445c242f9a0Schunli zhang - Sun Microsystems - Irvine United States 446c242f9a0Schunli zhang - Sun Microsystems - Irvine United States mutex_enter(&db->db_mtx); 447c242f9a0Schunli zhang - Sun Microsystems - Irvine United States if (arc_released(db->db_buf) || refcount_count(&db->db_holds) > 1) { 448c242f9a0Schunli zhang - Sun Microsystems - Irvine United States int blksz = db->db.db_size; 449744947dcSTom Erickson spa_t *spa; 450744947dcSTom Erickson 451c242f9a0Schunli zhang - Sun Microsystems - Irvine United States mutex_exit(&db->db_mtx); 452744947dcSTom Erickson DB_GET_SPA(&spa, db); 453744947dcSTom Erickson abuf = arc_loan_buf(spa, blksz); 454c242f9a0Schunli zhang - Sun Microsystems - Irvine United States bcopy(db->db.db_data, abuf->b_data, blksz); 455c242f9a0Schunli zhang - Sun Microsystems - Irvine United States } else { 456c242f9a0Schunli zhang - Sun Microsystems - Irvine United States abuf = db->db_buf; 457c242f9a0Schunli zhang - Sun Microsystems - Irvine United States arc_loan_inuse_buf(abuf, db); 458c242f9a0Schunli zhang - Sun Microsystems - Irvine United States dbuf_set_data(db, NULL); 459c242f9a0Schunli zhang - Sun Microsystems - Irvine United States mutex_exit(&db->db_mtx); 460c242f9a0Schunli zhang - Sun Microsystems - Irvine United States } 461c242f9a0Schunli zhang - Sun Microsystems - Irvine United States return (abuf); 462c242f9a0Schunli zhang - Sun Microsystems - Irvine United States } 463c242f9a0Schunli zhang - Sun Microsystems - Irvine United States 464fa9e4066Sahrens uint64_t 465fa9e4066Sahrens dbuf_whichblock(dnode_t *dn, uint64_t offset) 466fa9e4066Sahrens { 467fa9e4066Sahrens if (dn->dn_datablkshift) { 468fa9e4066Sahrens return (offset >> dn->dn_datablkshift); 469fa9e4066Sahrens } else { 470fa9e4066Sahrens ASSERT3U(offset, <, dn->dn_datablksz); 471fa9e4066Sahrens return (0); 472fa9e4066Sahrens } 473fa9e4066Sahrens } 474fa9e4066Sahrens 475fa9e4066Sahrens static void 476fa9e4066Sahrens dbuf_read_done(zio_t *zio, arc_buf_t *buf, void *vdb) 477fa9e4066Sahrens { 478fa9e4066Sahrens dmu_buf_impl_t *db = vdb; 479fa9e4066Sahrens 480fa9e4066Sahrens mutex_enter(&db->db_mtx); 481fa9e4066Sahrens ASSERT3U(db->db_state, ==, DB_READ); 482fa9e4066Sahrens /* 483fa9e4066Sahrens * All reads are synchronous, so we must have a hold on the dbuf 484fa9e4066Sahrens */ 485fa9e4066Sahrens ASSERT(refcount_count(&db->db_holds) > 0); 486ea8dc4b6Seschrock ASSERT(db->db_buf == NULL); 487fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 488c717a561Smaybee if (db->db_level == 0 && db->db_freed_in_flight) { 489fa9e4066Sahrens /* we were freed in flight; disregard any error */ 490fa9e4066Sahrens arc_release(buf, db); 491fa9e4066Sahrens bzero(buf->b_data, db->db.db_size); 4926b4acc8bSahrens arc_buf_freeze(buf); 493c717a561Smaybee db->db_freed_in_flight = FALSE; 494fa9e4066Sahrens dbuf_set_data(db, buf); 495fa9e4066Sahrens db->db_state = DB_CACHED; 496fa9e4066Sahrens } else if (zio == NULL || zio->io_error == 0) { 497fa9e4066Sahrens dbuf_set_data(db, buf); 498fa9e4066Sahrens db->db_state = DB_CACHED; 499fa9e4066Sahrens } else { 5000a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 501fa9e4066Sahrens ASSERT3P(db->db_buf, ==, NULL); 502*3b2aab18SMatthew Ahrens VERIFY(arc_buf_remove_ref(buf, db)); 503ea8dc4b6Seschrock db->db_state = DB_UNCACHED; 504fa9e4066Sahrens } 505fa9e4066Sahrens cv_broadcast(&db->db_changed); 5063f9d6ad7SLin Ling dbuf_rele_and_unlock(db, NULL); 507fa9e4066Sahrens } 508fa9e4066Sahrens 509ea8dc4b6Seschrock static void 51013506d1eSmaybee dbuf_read_impl(dmu_buf_impl_t *db, zio_t *zio, uint32_t *flags) 511fa9e4066Sahrens { 512744947dcSTom Erickson dnode_t *dn; 513744947dcSTom Erickson spa_t *spa; 514ea8dc4b6Seschrock zbookmark_t zb; 51513506d1eSmaybee uint32_t aflags = ARC_NOWAIT; 516fa9e4066Sahrens 517744947dcSTom Erickson DB_DNODE_ENTER(db); 518744947dcSTom Erickson dn = DB_DNODE(db); 519fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 520fa9e4066Sahrens /* We need the struct_rwlock to prevent db_blkptr from changing. */ 521088f3894Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 522ea8dc4b6Seschrock ASSERT(MUTEX_HELD(&db->db_mtx)); 523ea8dc4b6Seschrock ASSERT(db->db_state == DB_UNCACHED); 524ea8dc4b6Seschrock ASSERT(db->db_buf == NULL); 525fa9e4066Sahrens 5260a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 527cf04dda1SMark Maybee int bonuslen = MIN(dn->dn_bonuslen, dn->dn_phys->dn_bonuslen); 5281934e92fSmaybee 5291934e92fSmaybee ASSERT3U(bonuslen, <=, db->db.db_size); 530ea8dc4b6Seschrock db->db.db_data = zio_buf_alloc(DN_MAX_BONUSLEN); 5315a98e54bSBrendan Gregg - Sun Microsystems arc_space_consume(DN_MAX_BONUSLEN, ARC_SPACE_OTHER); 5321934e92fSmaybee if (bonuslen < DN_MAX_BONUSLEN) 533ea8dc4b6Seschrock bzero(db->db.db_data, DN_MAX_BONUSLEN); 534cf04dda1SMark Maybee if (bonuslen) 535cf04dda1SMark Maybee bcopy(DN_BONUS(dn->dn_phys), db->db.db_data, bonuslen); 536744947dcSTom Erickson DB_DNODE_EXIT(db); 537ea8dc4b6Seschrock dbuf_update_data(db); 538fa9e4066Sahrens db->db_state = DB_CACHED; 539fa9e4066Sahrens mutex_exit(&db->db_mtx); 540fa9e4066Sahrens return; 541fa9e4066Sahrens } 542fa9e4066Sahrens 5431c8564a7SMark Maybee /* 5441c8564a7SMark Maybee * Recheck BP_IS_HOLE() after dnode_block_freed() in case dnode_sync() 5451c8564a7SMark Maybee * processes the delete record and clears the bp while we are waiting 5461c8564a7SMark Maybee * for the dn_mtx (resulting in a "no" from block_freed). 5471c8564a7SMark Maybee */ 548088f3894Sahrens if (db->db_blkptr == NULL || BP_IS_HOLE(db->db_blkptr) || 5491c8564a7SMark Maybee (db->db_level == 0 && (dnode_block_freed(dn, db->db_blkid) || 5501c8564a7SMark Maybee BP_IS_HOLE(db->db_blkptr)))) { 551ad23a2dbSjohansen arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 552ad23a2dbSjohansen 553088f3894Sahrens dbuf_set_data(db, arc_buf_alloc(dn->dn_objset->os_spa, 554ad23a2dbSjohansen db->db.db_size, db, type)); 555744947dcSTom Erickson DB_DNODE_EXIT(db); 556fa9e4066Sahrens bzero(db->db.db_data, db->db.db_size); 557fa9e4066Sahrens db->db_state = DB_CACHED; 55813506d1eSmaybee *flags |= DB_RF_CACHED; 559fa9e4066Sahrens mutex_exit(&db->db_mtx); 560fa9e4066Sahrens return; 561fa9e4066Sahrens } 562fa9e4066Sahrens 563744947dcSTom Erickson spa = dn->dn_objset->os_spa; 564744947dcSTom Erickson DB_DNODE_EXIT(db); 565744947dcSTom Erickson 566fa9e4066Sahrens db->db_state = DB_READ; 567fa9e4066Sahrens mutex_exit(&db->db_mtx); 568fa9e4066Sahrens 5693baa08fcSek if (DBUF_IS_L2CACHEABLE(db)) 5703baa08fcSek aflags |= ARC_L2CACHE; 5713baa08fcSek 572b24ab676SJeff Bonwick SET_BOOKMARK(&zb, db->db_objset->os_dsl_dataset ? 573b24ab676SJeff Bonwick db->db_objset->os_dsl_dataset->ds_object : DMU_META_OBJSET, 574b24ab676SJeff Bonwick db->db.db_object, db->db_level, db->db_blkid); 575ea8dc4b6Seschrock 576ea8dc4b6Seschrock dbuf_add_ref(db, NULL); 577088f3894Sahrens 5781b912ec7SGeorge Wilson (void) arc_read(zio, spa, db->db_blkptr, 579fa9e4066Sahrens dbuf_read_done, db, ZIO_PRIORITY_SYNC_READ, 58013506d1eSmaybee (*flags & DB_RF_CANFAIL) ? ZIO_FLAG_CANFAIL : ZIO_FLAG_MUSTSUCCEED, 58113506d1eSmaybee &aflags, &zb); 58213506d1eSmaybee if (aflags & ARC_CACHED) 58313506d1eSmaybee *flags |= DB_RF_CACHED; 584fa9e4066Sahrens } 585fa9e4066Sahrens 586ea8dc4b6Seschrock int 587ea8dc4b6Seschrock dbuf_read(dmu_buf_impl_t *db, zio_t *zio, uint32_t flags) 588fa9e4066Sahrens { 589ea8dc4b6Seschrock int err = 0; 590ea8dc4b6Seschrock int havepzio = (zio != NULL); 59113506d1eSmaybee int prefetch; 592744947dcSTom Erickson dnode_t *dn; 593fa9e4066Sahrens 594fa9e4066Sahrens /* 595fa9e4066Sahrens * We don't have to hold the mutex to check db_state because it 596fa9e4066Sahrens * can't be freed while we have a hold on the buffer. 597fa9e4066Sahrens */ 598fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 599fa9e4066Sahrens 60082c9918fSTim Haley if (db->db_state == DB_NOFILL) 60182c9918fSTim Haley return (EIO); 60282c9918fSTim Haley 603744947dcSTom Erickson DB_DNODE_ENTER(db); 604744947dcSTom Erickson dn = DB_DNODE(db); 605ea8dc4b6Seschrock if ((flags & DB_RF_HAVESTRUCT) == 0) 606744947dcSTom Erickson rw_enter(&dn->dn_struct_rwlock, RW_READER); 607ea8dc4b6Seschrock 6080a586ceaSMark Shellenbaum prefetch = db->db_level == 0 && db->db_blkid != DMU_BONUS_BLKID && 609744947dcSTom Erickson (flags & DB_RF_NOPREFETCH) == 0 && dn != NULL && 6103baa08fcSek DBUF_IS_CACHEABLE(db); 61113506d1eSmaybee 612ea8dc4b6Seschrock mutex_enter(&db->db_mtx); 613ea8dc4b6Seschrock if (db->db_state == DB_CACHED) { 614ea8dc4b6Seschrock mutex_exit(&db->db_mtx); 61513506d1eSmaybee if (prefetch) 616744947dcSTom Erickson dmu_zfetch(&dn->dn_zfetch, db->db.db_offset, 61713506d1eSmaybee db->db.db_size, TRUE); 618fa9e4066Sahrens if ((flags & DB_RF_HAVESTRUCT) == 0) 619744947dcSTom Erickson rw_exit(&dn->dn_struct_rwlock); 620744947dcSTom Erickson DB_DNODE_EXIT(db); 621ea8dc4b6Seschrock } else if (db->db_state == DB_UNCACHED) { 622744947dcSTom Erickson spa_t *spa = dn->dn_objset->os_spa; 623744947dcSTom Erickson 624744947dcSTom Erickson if (zio == NULL) 625744947dcSTom Erickson zio = zio_root(spa, NULL, NULL, ZIO_FLAG_CANFAIL); 62613506d1eSmaybee dbuf_read_impl(db, zio, &flags); 62713506d1eSmaybee 628ea8dc4b6Seschrock /* dbuf_read_impl has dropped db_mtx for us */ 629ea8dc4b6Seschrock 63013506d1eSmaybee if (prefetch) 631744947dcSTom Erickson dmu_zfetch(&dn->dn_zfetch, db->db.db_offset, 63213506d1eSmaybee db->db.db_size, flags & DB_RF_CACHED); 633ea8dc4b6Seschrock 634fa9e4066Sahrens if ((flags & DB_RF_HAVESTRUCT) == 0) 635744947dcSTom Erickson rw_exit(&dn->dn_struct_rwlock); 636744947dcSTom Erickson DB_DNODE_EXIT(db); 637fa9e4066Sahrens 638ea8dc4b6Seschrock if (!havepzio) 639ea8dc4b6Seschrock err = zio_wait(zio); 640ea8dc4b6Seschrock } else { 64113506d1eSmaybee mutex_exit(&db->db_mtx); 64213506d1eSmaybee if (prefetch) 643744947dcSTom Erickson dmu_zfetch(&dn->dn_zfetch, db->db.db_offset, 64413506d1eSmaybee db->db.db_size, TRUE); 645ea8dc4b6Seschrock if ((flags & DB_RF_HAVESTRUCT) == 0) 646744947dcSTom Erickson rw_exit(&dn->dn_struct_rwlock); 647744947dcSTom Erickson DB_DNODE_EXIT(db); 64813506d1eSmaybee 64913506d1eSmaybee mutex_enter(&db->db_mtx); 650ea8dc4b6Seschrock if ((flags & DB_RF_NEVERWAIT) == 0) { 651ea8dc4b6Seschrock while (db->db_state == DB_READ || 652ea8dc4b6Seschrock db->db_state == DB_FILL) { 653ea8dc4b6Seschrock ASSERT(db->db_state == DB_READ || 654ea8dc4b6Seschrock (flags & DB_RF_HAVESTRUCT) == 0); 655ea8dc4b6Seschrock cv_wait(&db->db_changed, &db->db_mtx); 656ea8dc4b6Seschrock } 657ea8dc4b6Seschrock if (db->db_state == DB_UNCACHED) 658ea8dc4b6Seschrock err = EIO; 659ea8dc4b6Seschrock } 660ea8dc4b6Seschrock mutex_exit(&db->db_mtx); 661fa9e4066Sahrens } 662fa9e4066Sahrens 663ea8dc4b6Seschrock ASSERT(err || havepzio || db->db_state == DB_CACHED); 664ea8dc4b6Seschrock return (err); 665fa9e4066Sahrens } 666fa9e4066Sahrens 667fa9e4066Sahrens static void 668fa9e4066Sahrens dbuf_noread(dmu_buf_impl_t *db) 669fa9e4066Sahrens { 670fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 6710a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 672fa9e4066Sahrens mutex_enter(&db->db_mtx); 673fa9e4066Sahrens while (db->db_state == DB_READ || db->db_state == DB_FILL) 674fa9e4066Sahrens cv_wait(&db->db_changed, &db->db_mtx); 675fa9e4066Sahrens if (db->db_state == DB_UNCACHED) { 676ad23a2dbSjohansen arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 677744947dcSTom Erickson spa_t *spa; 678ad23a2dbSjohansen 679ea8dc4b6Seschrock ASSERT(db->db_buf == NULL); 680fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 681744947dcSTom Erickson DB_GET_SPA(&spa, db); 682744947dcSTom Erickson dbuf_set_data(db, arc_buf_alloc(spa, db->db.db_size, db, type)); 683fa9e4066Sahrens db->db_state = DB_FILL; 68482c9918fSTim Haley } else if (db->db_state == DB_NOFILL) { 68582c9918fSTim Haley dbuf_set_data(db, NULL); 686fa9e4066Sahrens } else { 687fa9e4066Sahrens ASSERT3U(db->db_state, ==, DB_CACHED); 688fa9e4066Sahrens } 689fa9e4066Sahrens mutex_exit(&db->db_mtx); 690fa9e4066Sahrens } 691fa9e4066Sahrens 692fa9e4066Sahrens /* 693fa9e4066Sahrens * This is our just-in-time copy function. It makes a copy of 694fa9e4066Sahrens * buffers, that have been modified in a previous transaction 695fa9e4066Sahrens * group, before we modify them in the current active group. 696fa9e4066Sahrens * 697fa9e4066Sahrens * This function is used in two places: when we are dirtying a 698fa9e4066Sahrens * buffer for the first time in a txg, and when we are freeing 699fa9e4066Sahrens * a range in a dnode that includes this buffer. 700fa9e4066Sahrens * 701fa9e4066Sahrens * Note that when we are called from dbuf_free_range() we do 702fa9e4066Sahrens * not put a hold on the buffer, we just traverse the active 703fa9e4066Sahrens * dbuf list for the dnode. 704fa9e4066Sahrens */ 705fa9e4066Sahrens static void 706fa9e4066Sahrens dbuf_fix_old_data(dmu_buf_impl_t *db, uint64_t txg) 707fa9e4066Sahrens { 708c717a561Smaybee dbuf_dirty_record_t *dr = db->db_last_dirty; 709fa9e4066Sahrens 710fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 711fa9e4066Sahrens ASSERT(db->db.db_data != NULL); 712c717a561Smaybee ASSERT(db->db_level == 0); 713c717a561Smaybee ASSERT(db->db.db_object != DMU_META_DNODE_OBJECT); 714fa9e4066Sahrens 7154d31c452Smaybee if (dr == NULL || 7164d31c452Smaybee (dr->dt.dl.dr_data != 7170a586ceaSMark Shellenbaum ((db->db_blkid == DMU_BONUS_BLKID) ? db->db.db_data : db->db_buf))) 718fa9e4066Sahrens return; 719fa9e4066Sahrens 720fa9e4066Sahrens /* 721c717a561Smaybee * If the last dirty record for this dbuf has not yet synced 722c717a561Smaybee * and its referencing the dbuf data, either: 723744947dcSTom Erickson * reset the reference to point to a new copy, 724c717a561Smaybee * or (if there a no active holders) 725c717a561Smaybee * just null out the current db_data pointer. 726fa9e4066Sahrens */ 727c717a561Smaybee ASSERT(dr->dr_txg >= txg - 2); 7280a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 729c717a561Smaybee /* Note that the data bufs here are zio_bufs */ 730c717a561Smaybee dr->dt.dl.dr_data = zio_buf_alloc(DN_MAX_BONUSLEN); 7315a98e54bSBrendan Gregg - Sun Microsystems arc_space_consume(DN_MAX_BONUSLEN, ARC_SPACE_OTHER); 732c717a561Smaybee bcopy(db->db.db_data, dr->dt.dl.dr_data, DN_MAX_BONUSLEN); 733c717a561Smaybee } else if (refcount_count(&db->db_holds) > db->db_dirtycnt) { 734c717a561Smaybee int size = db->db.db_size; 735c717a561Smaybee arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 736744947dcSTom Erickson spa_t *spa; 737744947dcSTom Erickson 738744947dcSTom Erickson DB_GET_SPA(&spa, db); 739744947dcSTom Erickson dr->dt.dl.dr_data = arc_buf_alloc(spa, size, db, type); 740c717a561Smaybee bcopy(db->db.db_data, dr->dt.dl.dr_data->b_data, size); 741c717a561Smaybee } else { 742c717a561Smaybee dbuf_set_data(db, NULL); 743fa9e4066Sahrens } 744fa9e4066Sahrens } 745fa9e4066Sahrens 746c717a561Smaybee void 747c717a561Smaybee dbuf_unoverride(dbuf_dirty_record_t *dr) 748ea8dc4b6Seschrock { 749c717a561Smaybee dmu_buf_impl_t *db = dr->dr_dbuf; 750b24ab676SJeff Bonwick blkptr_t *bp = &dr->dt.dl.dr_overridden_by; 751c717a561Smaybee uint64_t txg = dr->dr_txg; 752ea8dc4b6Seschrock 753ea8dc4b6Seschrock ASSERT(MUTEX_HELD(&db->db_mtx)); 754c717a561Smaybee ASSERT(dr->dt.dl.dr_override_state != DR_IN_DMU_SYNC); 755c717a561Smaybee ASSERT(db->db_level == 0); 756ea8dc4b6Seschrock 7570a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID || 758c717a561Smaybee dr->dt.dl.dr_override_state == DR_NOT_OVERRIDDEN) 759c717a561Smaybee return; 760ea8dc4b6Seschrock 761b24ab676SJeff Bonwick ASSERT(db->db_data_pending != dr); 762b24ab676SJeff Bonwick 763c717a561Smaybee /* free this block */ 76480901aeaSGeorge Wilson if (!BP_IS_HOLE(bp) && !dr->dt.dl.dr_nopwrite) { 765744947dcSTom Erickson spa_t *spa; 766b24ab676SJeff Bonwick 767744947dcSTom Erickson DB_GET_SPA(&spa, db); 768744947dcSTom Erickson zio_free(spa, txg, bp); 769744947dcSTom Erickson } 770c717a561Smaybee dr->dt.dl.dr_override_state = DR_NOT_OVERRIDDEN; 77180901aeaSGeorge Wilson dr->dt.dl.dr_nopwrite = B_FALSE; 77280901aeaSGeorge Wilson 773c717a561Smaybee /* 774c717a561Smaybee * Release the already-written buffer, so we leave it in 775c717a561Smaybee * a consistent dirty state. Note that all callers are 776c717a561Smaybee * modifying the buffer, so they will immediately do 777c717a561Smaybee * another (redundant) arc_release(). Therefore, leave 778c717a561Smaybee * the buf thawed to save the effort of freezing & 779c717a561Smaybee * immediately re-thawing it. 780c717a561Smaybee */ 781c717a561Smaybee arc_release(dr->dt.dl.dr_data, db); 782fa9e4066Sahrens } 783fa9e4066Sahrens 784cdb0ab79Smaybee /* 785cdb0ab79Smaybee * Evict (if its unreferenced) or clear (if its referenced) any level-0 786cdb0ab79Smaybee * data blocks in the free range, so that any future readers will find 787cdb0ab79Smaybee * empty blocks. Also, if we happen accross any level-1 dbufs in the 788cdb0ab79Smaybee * range that have not already been marked dirty, mark them dirty so 789cdb0ab79Smaybee * they stay in memory. 790cdb0ab79Smaybee */ 791fa9e4066Sahrens void 792cdb0ab79Smaybee dbuf_free_range(dnode_t *dn, uint64_t start, uint64_t end, dmu_tx_t *tx) 793fa9e4066Sahrens { 794fa9e4066Sahrens dmu_buf_impl_t *db, *db_next; 795fa9e4066Sahrens uint64_t txg = tx->tx_txg; 796cdb0ab79Smaybee int epbs = dn->dn_indblkshift - SPA_BLKPTRSHIFT; 797cdb0ab79Smaybee uint64_t first_l1 = start >> epbs; 798cdb0ab79Smaybee uint64_t last_l1 = end >> epbs; 799fa9e4066Sahrens 8000a586ceaSMark Shellenbaum if (end > dn->dn_maxblkid && (end != DMU_SPILL_BLKID)) { 801cdb0ab79Smaybee end = dn->dn_maxblkid; 802cdb0ab79Smaybee last_l1 = end >> epbs; 803cdb0ab79Smaybee } 804cdb0ab79Smaybee dprintf_dnode(dn, "start=%llu end=%llu\n", start, end); 805fa9e4066Sahrens mutex_enter(&dn->dn_dbufs_mtx); 806fa9e4066Sahrens for (db = list_head(&dn->dn_dbufs); db; db = db_next) { 807fa9e4066Sahrens db_next = list_next(&dn->dn_dbufs, db); 8080a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 809cdb0ab79Smaybee 810cdb0ab79Smaybee if (db->db_level == 1 && 811cdb0ab79Smaybee db->db_blkid >= first_l1 && db->db_blkid <= last_l1) { 812cdb0ab79Smaybee mutex_enter(&db->db_mtx); 813cdb0ab79Smaybee if (db->db_last_dirty && 814cdb0ab79Smaybee db->db_last_dirty->dr_txg < txg) { 815cdb0ab79Smaybee dbuf_add_ref(db, FTAG); 816cdb0ab79Smaybee mutex_exit(&db->db_mtx); 817cdb0ab79Smaybee dbuf_will_dirty(db, tx); 818cdb0ab79Smaybee dbuf_rele(db, FTAG); 819cdb0ab79Smaybee } else { 820cdb0ab79Smaybee mutex_exit(&db->db_mtx); 821cdb0ab79Smaybee } 822cdb0ab79Smaybee } 823cdb0ab79Smaybee 824ea8dc4b6Seschrock if (db->db_level != 0) 825fa9e4066Sahrens continue; 826fa9e4066Sahrens dprintf_dbuf(db, "found buf %s\n", ""); 827cdb0ab79Smaybee if (db->db_blkid < start || db->db_blkid > end) 828fa9e4066Sahrens continue; 829fa9e4066Sahrens 830fa9e4066Sahrens /* found a level 0 buffer in the range */ 831*3b2aab18SMatthew Ahrens mutex_enter(&db->db_mtx); 832*3b2aab18SMatthew Ahrens if (dbuf_undirty(db, tx)) { 833*3b2aab18SMatthew Ahrens /* mutex has been dropped and dbuf destroyed */ 834fa9e4066Sahrens continue; 835*3b2aab18SMatthew Ahrens } 836fa9e4066Sahrens 837ea8dc4b6Seschrock if (db->db_state == DB_UNCACHED || 83882c9918fSTim Haley db->db_state == DB_NOFILL || 839ea8dc4b6Seschrock db->db_state == DB_EVICTING) { 840fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 841fa9e4066Sahrens mutex_exit(&db->db_mtx); 842fa9e4066Sahrens continue; 843fa9e4066Sahrens } 844c543ec06Sahrens if (db->db_state == DB_READ || db->db_state == DB_FILL) { 845c543ec06Sahrens /* will be handled in dbuf_read_done or dbuf_rele */ 846c717a561Smaybee db->db_freed_in_flight = TRUE; 847fa9e4066Sahrens mutex_exit(&db->db_mtx); 848fa9e4066Sahrens continue; 849fa9e4066Sahrens } 850ea8dc4b6Seschrock if (refcount_count(&db->db_holds) == 0) { 851ea8dc4b6Seschrock ASSERT(db->db_buf); 852ea8dc4b6Seschrock dbuf_clear(db); 853ea8dc4b6Seschrock continue; 854ea8dc4b6Seschrock } 855c717a561Smaybee /* The dbuf is referenced */ 856fa9e4066Sahrens 857c717a561Smaybee if (db->db_last_dirty != NULL) { 858c717a561Smaybee dbuf_dirty_record_t *dr = db->db_last_dirty; 859c717a561Smaybee 860c717a561Smaybee if (dr->dr_txg == txg) { 86144eda4d7Smaybee /* 862c717a561Smaybee * This buffer is "in-use", re-adjust the file 863c717a561Smaybee * size to reflect that this buffer may 864c717a561Smaybee * contain new data when we sync. 86544eda4d7Smaybee */ 86606e0070dSMark Shellenbaum if (db->db_blkid != DMU_SPILL_BLKID && 86706e0070dSMark Shellenbaum db->db_blkid > dn->dn_maxblkid) 868c717a561Smaybee dn->dn_maxblkid = db->db_blkid; 869c717a561Smaybee dbuf_unoverride(dr); 870c717a561Smaybee } else { 871c717a561Smaybee /* 872c717a561Smaybee * This dbuf is not dirty in the open context. 873c717a561Smaybee * Either uncache it (if its not referenced in 874c717a561Smaybee * the open context) or reset its contents to 875c717a561Smaybee * empty. 876c717a561Smaybee */ 877c717a561Smaybee dbuf_fix_old_data(db, txg); 87844eda4d7Smaybee } 879ea8dc4b6Seschrock } 880c717a561Smaybee /* clear the contents if its cached */ 881ea8dc4b6Seschrock if (db->db_state == DB_CACHED) { 882ea8dc4b6Seschrock ASSERT(db->db.db_data != NULL); 883fa9e4066Sahrens arc_release(db->db_buf, db); 884fa9e4066Sahrens bzero(db->db.db_data, db->db.db_size); 8856b4acc8bSahrens arc_buf_freeze(db->db_buf); 886fa9e4066Sahrens } 887ea8dc4b6Seschrock 888fa9e4066Sahrens mutex_exit(&db->db_mtx); 889fa9e4066Sahrens } 890fa9e4066Sahrens mutex_exit(&dn->dn_dbufs_mtx); 891fa9e4066Sahrens } 892fa9e4066Sahrens 893fa9e4066Sahrens static int 8941934e92fSmaybee dbuf_block_freeable(dmu_buf_impl_t *db) 895fa9e4066Sahrens { 896fa9e4066Sahrens dsl_dataset_t *ds = db->db_objset->os_dsl_dataset; 897fa9e4066Sahrens uint64_t birth_txg = 0; 898fa9e4066Sahrens 899fa9e4066Sahrens /* 900fa9e4066Sahrens * We don't need any locking to protect db_blkptr: 901c717a561Smaybee * If it's syncing, then db_last_dirty will be set 902c717a561Smaybee * so we'll ignore db_blkptr. 903fa9e4066Sahrens */ 904c717a561Smaybee ASSERT(MUTEX_HELD(&db->db_mtx)); 905c717a561Smaybee if (db->db_last_dirty) 906c717a561Smaybee birth_txg = db->db_last_dirty->dr_txg; 907fa9e4066Sahrens else if (db->db_blkptr) 908fa9e4066Sahrens birth_txg = db->db_blkptr->blk_birth; 909fa9e4066Sahrens 910837b568bSGeorge Wilson /* 911837b568bSGeorge Wilson * If we don't exist or are in a snapshot, we can't be freed. 912837b568bSGeorge Wilson * Don't pass the bp to dsl_dataset_block_freeable() since we 913837b568bSGeorge Wilson * are holding the db_mtx lock and might deadlock if we are 914837b568bSGeorge Wilson * prefetching a dedup-ed block. 915837b568bSGeorge Wilson */ 916fa9e4066Sahrens if (birth_txg) 9171934e92fSmaybee return (ds == NULL || 918837b568bSGeorge Wilson dsl_dataset_block_freeable(ds, NULL, birth_txg)); 919fa9e4066Sahrens else 9201934e92fSmaybee return (FALSE); 921fa9e4066Sahrens } 922fa9e4066Sahrens 923fa9e4066Sahrens void 924fa9e4066Sahrens dbuf_new_size(dmu_buf_impl_t *db, int size, dmu_tx_t *tx) 925fa9e4066Sahrens { 926fa9e4066Sahrens arc_buf_t *buf, *obuf; 927fa9e4066Sahrens int osize = db->db.db_size; 928ad23a2dbSjohansen arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 929744947dcSTom Erickson dnode_t *dn; 930fa9e4066Sahrens 9310a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 932ea8dc4b6Seschrock 933744947dcSTom Erickson DB_DNODE_ENTER(db); 934744947dcSTom Erickson dn = DB_DNODE(db); 935744947dcSTom Erickson 936fa9e4066Sahrens /* XXX does *this* func really need the lock? */ 937744947dcSTom Erickson ASSERT(RW_WRITE_HELD(&dn->dn_struct_rwlock)); 938fa9e4066Sahrens 939fa9e4066Sahrens /* 940fa9e4066Sahrens * This call to dbuf_will_dirty() with the dn_struct_rwlock held 941fa9e4066Sahrens * is OK, because there can be no other references to the db 942fa9e4066Sahrens * when we are changing its size, so no concurrent DB_FILL can 943fa9e4066Sahrens * be happening. 944fa9e4066Sahrens */ 945ea8dc4b6Seschrock /* 946ea8dc4b6Seschrock * XXX we should be doing a dbuf_read, checking the return 947ea8dc4b6Seschrock * value and returning that up to our callers 948ea8dc4b6Seschrock */ 949fa9e4066Sahrens dbuf_will_dirty(db, tx); 950fa9e4066Sahrens 951fa9e4066Sahrens /* create the data buffer for the new block */ 952744947dcSTom Erickson buf = arc_buf_alloc(dn->dn_objset->os_spa, size, db, type); 953fa9e4066Sahrens 954fa9e4066Sahrens /* copy old block data to the new block */ 955fa9e4066Sahrens obuf = db->db_buf; 956f65e61c0Sahrens bcopy(obuf->b_data, buf->b_data, MIN(osize, size)); 957fa9e4066Sahrens /* zero the remainder */ 958f65e61c0Sahrens if (size > osize) 959f65e61c0Sahrens bzero((uint8_t *)buf->b_data + osize, size - osize); 960fa9e4066Sahrens 961fa9e4066Sahrens mutex_enter(&db->db_mtx); 962fa9e4066Sahrens dbuf_set_data(db, buf); 963*3b2aab18SMatthew Ahrens VERIFY(arc_buf_remove_ref(obuf, db)); 964fa9e4066Sahrens db->db.db_size = size; 965fa9e4066Sahrens 966c717a561Smaybee if (db->db_level == 0) { 967c717a561Smaybee ASSERT3U(db->db_last_dirty->dr_txg, ==, tx->tx_txg); 968c717a561Smaybee db->db_last_dirty->dt.dl.dr_data = buf; 969c717a561Smaybee } 970fa9e4066Sahrens mutex_exit(&db->db_mtx); 971fa9e4066Sahrens 972744947dcSTom Erickson dnode_willuse_space(dn, size-osize, tx); 973744947dcSTom Erickson DB_DNODE_EXIT(db); 974fa9e4066Sahrens } 975fa9e4066Sahrens 9763f9d6ad7SLin Ling void 9773f9d6ad7SLin Ling dbuf_release_bp(dmu_buf_impl_t *db) 9783f9d6ad7SLin Ling { 979744947dcSTom Erickson objset_t *os; 9803f9d6ad7SLin Ling 981744947dcSTom Erickson DB_GET_OBJSET(&os, db); 9823f9d6ad7SLin Ling ASSERT(dsl_pool_sync_context(dmu_objset_pool(os))); 9833f9d6ad7SLin Ling ASSERT(arc_released(os->os_phys_buf) || 9843f9d6ad7SLin Ling list_link_active(&os->os_dsl_dataset->ds_synced_link)); 9853f9d6ad7SLin Ling ASSERT(db->db_parent == NULL || arc_released(db->db_parent->db_buf)); 9863f9d6ad7SLin Ling 9871b912ec7SGeorge Wilson (void) arc_release(db->db_buf, db); 9883f9d6ad7SLin Ling } 9893f9d6ad7SLin Ling 990c717a561Smaybee dbuf_dirty_record_t * 991fa9e4066Sahrens dbuf_dirty(dmu_buf_impl_t *db, dmu_tx_t *tx) 992fa9e4066Sahrens { 993744947dcSTom Erickson dnode_t *dn; 994744947dcSTom Erickson objset_t *os; 995c717a561Smaybee dbuf_dirty_record_t **drp, *dr; 996fa9e4066Sahrens int drop_struct_lock = FALSE; 997d3469faaSMark Maybee boolean_t do_free_accounting = B_FALSE; 998fa9e4066Sahrens int txgoff = tx->tx_txg & TXG_MASK; 999fa9e4066Sahrens 1000fa9e4066Sahrens ASSERT(tx->tx_txg != 0); 1001fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 10029c9dc39aSek DMU_TX_DIRTY_BUF(tx, db); 1003fa9e4066Sahrens 1004744947dcSTom Erickson DB_DNODE_ENTER(db); 1005744947dcSTom Erickson dn = DB_DNODE(db); 1006fa9e4066Sahrens /* 1007fa9e4066Sahrens * Shouldn't dirty a regular buffer in syncing context. Private 1008fa9e4066Sahrens * objects may be dirtied in syncing context, but only if they 1009fa9e4066Sahrens * were already pre-dirtied in open context. 1010fa9e4066Sahrens */ 1011c717a561Smaybee ASSERT(!dmu_tx_is_syncing(tx) || 1012c717a561Smaybee BP_IS_HOLE(dn->dn_objset->os_rootbp) || 101314843421SMatthew Ahrens DMU_OBJECT_IS_SPECIAL(dn->dn_object) || 101414843421SMatthew Ahrens dn->dn_objset->os_dsl_dataset == NULL); 1015fa9e4066Sahrens /* 1016fa9e4066Sahrens * We make this assert for private objects as well, but after we 1017fa9e4066Sahrens * check if we're already dirty. They are allowed to re-dirty 1018fa9e4066Sahrens * in syncing context. 1019fa9e4066Sahrens */ 1020ea8dc4b6Seschrock ASSERT(dn->dn_object == DMU_META_DNODE_OBJECT || 1021c717a561Smaybee dn->dn_dirtyctx == DN_UNDIRTIED || dn->dn_dirtyctx == 1022fa9e4066Sahrens (dmu_tx_is_syncing(tx) ? DN_DIRTY_SYNC : DN_DIRTY_OPEN)); 1023fa9e4066Sahrens 1024fa9e4066Sahrens mutex_enter(&db->db_mtx); 1025fa9e4066Sahrens /* 1026c717a561Smaybee * XXX make this true for indirects too? The problem is that 1027c717a561Smaybee * transactions created with dmu_tx_create_assigned() from 1028c717a561Smaybee * syncing context don't bother holding ahead. 1029fa9e4066Sahrens */ 1030c717a561Smaybee ASSERT(db->db_level != 0 || 103182c9918fSTim Haley db->db_state == DB_CACHED || db->db_state == DB_FILL || 103282c9918fSTim Haley db->db_state == DB_NOFILL); 1033fa9e4066Sahrens 1034fa9e4066Sahrens mutex_enter(&dn->dn_mtx); 1035fa9e4066Sahrens /* 1036fa9e4066Sahrens * Don't set dirtyctx to SYNC if we're just modifying this as we 1037fa9e4066Sahrens * initialize the objset. 1038fa9e4066Sahrens */ 1039fa9e4066Sahrens if (dn->dn_dirtyctx == DN_UNDIRTIED && 1040c717a561Smaybee !BP_IS_HOLE(dn->dn_objset->os_rootbp)) { 1041fa9e4066Sahrens dn->dn_dirtyctx = 1042fa9e4066Sahrens (dmu_tx_is_syncing(tx) ? DN_DIRTY_SYNC : DN_DIRTY_OPEN); 1043fa9e4066Sahrens ASSERT(dn->dn_dirtyctx_firstset == NULL); 1044fa9e4066Sahrens dn->dn_dirtyctx_firstset = kmem_alloc(1, KM_SLEEP); 1045fa9e4066Sahrens } 1046fa9e4066Sahrens mutex_exit(&dn->dn_mtx); 1047fa9e4066Sahrens 10480a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) 10490a586ceaSMark Shellenbaum dn->dn_have_spill = B_TRUE; 10500a586ceaSMark Shellenbaum 1051fa9e4066Sahrens /* 1052fa9e4066Sahrens * If this buffer is already dirty, we're done. 1053fa9e4066Sahrens */ 1054c717a561Smaybee drp = &db->db_last_dirty; 1055c717a561Smaybee ASSERT(*drp == NULL || (*drp)->dr_txg <= tx->tx_txg || 1056c717a561Smaybee db->db.db_object == DMU_META_DNODE_OBJECT); 10577e2186e3Sbonwick while ((dr = *drp) != NULL && dr->dr_txg > tx->tx_txg) 10587e2186e3Sbonwick drp = &dr->dr_next; 10597e2186e3Sbonwick if (dr && dr->dr_txg == tx->tx_txg) { 1060744947dcSTom Erickson DB_DNODE_EXIT(db); 1061744947dcSTom Erickson 10620a586ceaSMark Shellenbaum if (db->db_level == 0 && db->db_blkid != DMU_BONUS_BLKID) { 1063c717a561Smaybee /* 1064c717a561Smaybee * If this buffer has already been written out, 1065c717a561Smaybee * we now need to reset its state. 1066c717a561Smaybee */ 10677e2186e3Sbonwick dbuf_unoverride(dr); 1068b24ab676SJeff Bonwick if (db->db.db_object != DMU_META_DNODE_OBJECT && 1069b24ab676SJeff Bonwick db->db_state != DB_NOFILL) 1070c717a561Smaybee arc_buf_thaw(db->db_buf); 1071c717a561Smaybee } 1072fa9e4066Sahrens mutex_exit(&db->db_mtx); 10737e2186e3Sbonwick return (dr); 1074fa9e4066Sahrens } 1075fa9e4066Sahrens 1076fa9e4066Sahrens /* 1077fa9e4066Sahrens * Only valid if not already dirty. 1078fa9e4066Sahrens */ 107914843421SMatthew Ahrens ASSERT(dn->dn_object == 0 || 108014843421SMatthew Ahrens dn->dn_dirtyctx == DN_UNDIRTIED || dn->dn_dirtyctx == 1081fa9e4066Sahrens (dmu_tx_is_syncing(tx) ? DN_DIRTY_SYNC : DN_DIRTY_OPEN)); 1082fa9e4066Sahrens 1083fa9e4066Sahrens ASSERT3U(dn->dn_nlevels, >, db->db_level); 1084fa9e4066Sahrens ASSERT((dn->dn_phys->dn_nlevels == 0 && db->db_level == 0) || 1085fa9e4066Sahrens dn->dn_phys->dn_nlevels > db->db_level || 1086fa9e4066Sahrens dn->dn_next_nlevels[txgoff] > db->db_level || 1087fa9e4066Sahrens dn->dn_next_nlevels[(tx->tx_txg-1) & TXG_MASK] > db->db_level || 1088fa9e4066Sahrens dn->dn_next_nlevels[(tx->tx_txg-2) & TXG_MASK] > db->db_level); 1089fa9e4066Sahrens 1090fa9e4066Sahrens /* 1091fa9e4066Sahrens * We should only be dirtying in syncing context if it's the 109214843421SMatthew Ahrens * mos or we're initializing the os or it's a special object. 109314843421SMatthew Ahrens * However, we are allowed to dirty in syncing context provided 109414843421SMatthew Ahrens * we already dirtied it in open context. Hence we must make 109514843421SMatthew Ahrens * this assertion only if we're not already dirty. 1096fa9e4066Sahrens */ 1097744947dcSTom Erickson os = dn->dn_objset; 109814843421SMatthew Ahrens ASSERT(!dmu_tx_is_syncing(tx) || DMU_OBJECT_IS_SPECIAL(dn->dn_object) || 109914843421SMatthew Ahrens os->os_dsl_dataset == NULL || BP_IS_HOLE(os->os_rootbp)); 1100fa9e4066Sahrens ASSERT(db->db.db_size != 0); 1101fa9e4066Sahrens 1102fa9e4066Sahrens dprintf_dbuf(db, "size=%llx\n", (u_longlong_t)db->db.db_size); 1103fa9e4066Sahrens 11040a586ceaSMark Shellenbaum if (db->db_blkid != DMU_BONUS_BLKID) { 11051934e92fSmaybee /* 11061934e92fSmaybee * Update the accounting. 1107d3469faaSMark Maybee * Note: we delay "free accounting" until after we drop 1108d3469faaSMark Maybee * the db_mtx. This keeps us from grabbing other locks 1109b24ab676SJeff Bonwick * (and possibly deadlocking) in bp_get_dsize() while 1110d3469faaSMark Maybee * also holding the db_mtx. 11111934e92fSmaybee */ 11121934e92fSmaybee dnode_willuse_space(dn, db->db.db_size, tx); 1113d3469faaSMark Maybee do_free_accounting = dbuf_block_freeable(db); 11141934e92fSmaybee } 11151934e92fSmaybee 1116ea8dc4b6Seschrock /* 1117ea8dc4b6Seschrock * If this buffer is dirty in an old transaction group we need 1118ea8dc4b6Seschrock * to make a copy of it so that the changes we make in this 1119ea8dc4b6Seschrock * transaction group won't leak out when we sync the older txg. 1120ea8dc4b6Seschrock */ 1121c717a561Smaybee dr = kmem_zalloc(sizeof (dbuf_dirty_record_t), KM_SLEEP); 1122c717a561Smaybee if (db->db_level == 0) { 1123c717a561Smaybee void *data_old = db->db_buf; 1124c717a561Smaybee 112582c9918fSTim Haley if (db->db_state != DB_NOFILL) { 11260a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 112782c9918fSTim Haley dbuf_fix_old_data(db, tx->tx_txg); 112882c9918fSTim Haley data_old = db->db.db_data; 112982c9918fSTim Haley } else if (db->db.db_object != DMU_META_DNODE_OBJECT) { 113082c9918fSTim Haley /* 113182c9918fSTim Haley * Release the data buffer from the cache so 113282c9918fSTim Haley * that we can modify it without impacting 113382c9918fSTim Haley * possible other users of this cached data 113482c9918fSTim Haley * block. Note that indirect blocks and 113582c9918fSTim Haley * private objects are not released until the 113682c9918fSTim Haley * syncing state (since they are only modified 113782c9918fSTim Haley * then). 113882c9918fSTim Haley */ 113982c9918fSTim Haley arc_release(db->db_buf, db); 114082c9918fSTim Haley dbuf_fix_old_data(db, tx->tx_txg); 114182c9918fSTim Haley data_old = db->db_buf; 114282c9918fSTim Haley } 114382c9918fSTim Haley ASSERT(data_old != NULL); 1144fa9e4066Sahrens } 1145c717a561Smaybee dr->dt.dl.dr_data = data_old; 1146c717a561Smaybee } else { 1147c717a561Smaybee mutex_init(&dr->dt.di.dr_mtx, NULL, MUTEX_DEFAULT, NULL); 1148c717a561Smaybee list_create(&dr->dt.di.dr_children, 1149c717a561Smaybee sizeof (dbuf_dirty_record_t), 1150c717a561Smaybee offsetof(dbuf_dirty_record_t, dr_dirty_node)); 1151fa9e4066Sahrens } 1152c717a561Smaybee dr->dr_dbuf = db; 1153c717a561Smaybee dr->dr_txg = tx->tx_txg; 1154c717a561Smaybee dr->dr_next = *drp; 1155c717a561Smaybee *drp = dr; 1156fa9e4066Sahrens 1157fa9e4066Sahrens /* 1158fa9e4066Sahrens * We could have been freed_in_flight between the dbuf_noread 1159fa9e4066Sahrens * and dbuf_dirty. We win, as though the dbuf_noread() had 1160fa9e4066Sahrens * happened after the free. 1161fa9e4066Sahrens */ 11620a586ceaSMark Shellenbaum if (db->db_level == 0 && db->db_blkid != DMU_BONUS_BLKID && 11630a586ceaSMark Shellenbaum db->db_blkid != DMU_SPILL_BLKID) { 1164c717a561Smaybee mutex_enter(&dn->dn_mtx); 1165fa9e4066Sahrens dnode_clear_range(dn, db->db_blkid, 1, tx); 1166c717a561Smaybee mutex_exit(&dn->dn_mtx); 1167c717a561Smaybee db->db_freed_in_flight = FALSE; 1168fa9e4066Sahrens } 1169fa9e4066Sahrens 1170fa9e4066Sahrens /* 1171fa9e4066Sahrens * This buffer is now part of this txg 1172fa9e4066Sahrens */ 1173fa9e4066Sahrens dbuf_add_ref(db, (void *)(uintptr_t)tx->tx_txg); 1174fa9e4066Sahrens db->db_dirtycnt += 1; 1175fa9e4066Sahrens ASSERT3U(db->db_dirtycnt, <=, 3); 1176fa9e4066Sahrens 1177fa9e4066Sahrens mutex_exit(&db->db_mtx); 1178fa9e4066Sahrens 11790a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID || 11800a586ceaSMark Shellenbaum db->db_blkid == DMU_SPILL_BLKID) { 1181c717a561Smaybee mutex_enter(&dn->dn_mtx); 1182c717a561Smaybee ASSERT(!list_link_active(&dr->dr_dirty_node)); 1183c717a561Smaybee list_insert_tail(&dn->dn_dirty_records[txgoff], dr); 1184c717a561Smaybee mutex_exit(&dn->dn_mtx); 1185fa9e4066Sahrens dnode_setdirty(dn, tx); 1186744947dcSTom Erickson DB_DNODE_EXIT(db); 1187c717a561Smaybee return (dr); 1188d3469faaSMark Maybee } else if (do_free_accounting) { 1189d3469faaSMark Maybee blkptr_t *bp = db->db_blkptr; 1190d3469faaSMark Maybee int64_t willfree = (bp && !BP_IS_HOLE(bp)) ? 1191b24ab676SJeff Bonwick bp_get_dsize(os->os_spa, bp) : db->db.db_size; 1192d3469faaSMark Maybee /* 1193d3469faaSMark Maybee * This is only a guess -- if the dbuf is dirty 1194d3469faaSMark Maybee * in a previous txg, we don't know how much 1195d3469faaSMark Maybee * space it will use on disk yet. We should 1196d3469faaSMark Maybee * really have the struct_rwlock to access 1197d3469faaSMark Maybee * db_blkptr, but since this is just a guess, 1198d3469faaSMark Maybee * it's OK if we get an odd answer. 1199d3469faaSMark Maybee */ 1200837b568bSGeorge Wilson ddt_prefetch(os->os_spa, bp); 1201d3469faaSMark Maybee dnode_willuse_space(dn, -willfree, tx); 1202fa9e4066Sahrens } 1203fa9e4066Sahrens 1204fa9e4066Sahrens if (!RW_WRITE_HELD(&dn->dn_struct_rwlock)) { 1205fa9e4066Sahrens rw_enter(&dn->dn_struct_rwlock, RW_READER); 1206fa9e4066Sahrens drop_struct_lock = TRUE; 1207fa9e4066Sahrens } 1208fa9e4066Sahrens 12098346f03fSJonathan W Adams if (db->db_level == 0) { 12108346f03fSJonathan W Adams dnode_new_blkid(dn, db->db_blkid, tx, drop_struct_lock); 12118346f03fSJonathan W Adams ASSERT(dn->dn_maxblkid >= db->db_blkid); 12128346f03fSJonathan W Adams } 12138346f03fSJonathan W Adams 121444eda4d7Smaybee if (db->db_level+1 < dn->dn_nlevels) { 1215c717a561Smaybee dmu_buf_impl_t *parent = db->db_parent; 1216c717a561Smaybee dbuf_dirty_record_t *di; 1217c717a561Smaybee int parent_held = FALSE; 1218c717a561Smaybee 1219c717a561Smaybee if (db->db_parent == NULL || db->db_parent == dn->dn_dbuf) { 1220c717a561Smaybee int epbs = dn->dn_indblkshift - SPA_BLKPTRSHIFT; 1221c717a561Smaybee 1222c717a561Smaybee parent = dbuf_hold_level(dn, db->db_level+1, 1223c717a561Smaybee db->db_blkid >> epbs, FTAG); 122401025c89SJohn Harres ASSERT(parent != NULL); 1225c717a561Smaybee parent_held = TRUE; 1226c717a561Smaybee } 1227fa9e4066Sahrens if (drop_struct_lock) 1228fa9e4066Sahrens rw_exit(&dn->dn_struct_rwlock); 1229c717a561Smaybee ASSERT3U(db->db_level+1, ==, parent->db_level); 1230c717a561Smaybee di = dbuf_dirty(parent, tx); 1231c717a561Smaybee if (parent_held) 1232c717a561Smaybee dbuf_rele(parent, FTAG); 1233c717a561Smaybee 1234c717a561Smaybee mutex_enter(&db->db_mtx); 1235c717a561Smaybee /* possible race with dbuf_undirty() */ 1236c717a561Smaybee if (db->db_last_dirty == dr || 1237c717a561Smaybee dn->dn_object == DMU_META_DNODE_OBJECT) { 1238c717a561Smaybee mutex_enter(&di->dt.di.dr_mtx); 1239c717a561Smaybee ASSERT3U(di->dr_txg, ==, tx->tx_txg); 1240c717a561Smaybee ASSERT(!list_link_active(&dr->dr_dirty_node)); 1241c717a561Smaybee list_insert_tail(&di->dt.di.dr_children, dr); 1242c717a561Smaybee mutex_exit(&di->dt.di.dr_mtx); 1243c717a561Smaybee dr->dr_parent = di; 1244c717a561Smaybee } 1245c717a561Smaybee mutex_exit(&db->db_mtx); 1246fa9e4066Sahrens } else { 1247c717a561Smaybee ASSERT(db->db_level+1 == dn->dn_nlevels); 1248c717a561Smaybee ASSERT(db->db_blkid < dn->dn_nblkptr); 1249744947dcSTom Erickson ASSERT(db->db_parent == NULL || db->db_parent == dn->dn_dbuf); 1250c717a561Smaybee mutex_enter(&dn->dn_mtx); 1251c717a561Smaybee ASSERT(!list_link_active(&dr->dr_dirty_node)); 1252c717a561Smaybee list_insert_tail(&dn->dn_dirty_records[txgoff], dr); 1253c717a561Smaybee mutex_exit(&dn->dn_mtx); 1254fa9e4066Sahrens if (drop_struct_lock) 1255fa9e4066Sahrens rw_exit(&dn->dn_struct_rwlock); 1256fa9e4066Sahrens } 1257fa9e4066Sahrens 1258fa9e4066Sahrens dnode_setdirty(dn, tx); 1259744947dcSTom Erickson DB_DNODE_EXIT(db); 1260c717a561Smaybee return (dr); 1261fa9e4066Sahrens } 1262fa9e4066Sahrens 1263*3b2aab18SMatthew Ahrens /* 1264*3b2aab18SMatthew Ahrens * Return TRUE if this evicted the dbuf. 1265*3b2aab18SMatthew Ahrens */ 1266*3b2aab18SMatthew Ahrens static boolean_t 1267fa9e4066Sahrens dbuf_undirty(dmu_buf_impl_t *db, dmu_tx_t *tx) 1268fa9e4066Sahrens { 1269744947dcSTom Erickson dnode_t *dn; 1270c717a561Smaybee uint64_t txg = tx->tx_txg; 127117f17c2dSbonwick dbuf_dirty_record_t *dr, **drp; 1272fa9e4066Sahrens 1273c717a561Smaybee ASSERT(txg != 0); 12740a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 1275*3b2aab18SMatthew Ahrens ASSERT0(db->db_level); 1276*3b2aab18SMatthew Ahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 1277fa9e4066Sahrens 1278fa9e4066Sahrens /* 1279fa9e4066Sahrens * If this buffer is not dirty, we're done. 1280fa9e4066Sahrens */ 128117f17c2dSbonwick for (drp = &db->db_last_dirty; (dr = *drp) != NULL; drp = &dr->dr_next) 1282c717a561Smaybee if (dr->dr_txg <= txg) 1283c717a561Smaybee break; 1284*3b2aab18SMatthew Ahrens if (dr == NULL || dr->dr_txg < txg) 1285*3b2aab18SMatthew Ahrens return (B_FALSE); 1286c717a561Smaybee ASSERT(dr->dr_txg == txg); 1287b24ab676SJeff Bonwick ASSERT(dr->dr_dbuf == db); 1288fa9e4066Sahrens 1289744947dcSTom Erickson DB_DNODE_ENTER(db); 1290744947dcSTom Erickson dn = DB_DNODE(db); 1291744947dcSTom Erickson 1292fa9e4066Sahrens /* 1293*3b2aab18SMatthew Ahrens * Note: This code will probably work even if there are concurrent 1294*3b2aab18SMatthew Ahrens * holders, but it is untested in that scenerio, as the ZPL and 1295*3b2aab18SMatthew Ahrens * ztest have additional locking (the range locks) that prevents 1296*3b2aab18SMatthew Ahrens * that type of concurrent access. 1297fa9e4066Sahrens */ 1298*3b2aab18SMatthew Ahrens ASSERT3U(refcount_count(&db->db_holds), ==, db->db_dirtycnt); 1299fa9e4066Sahrens 1300fa9e4066Sahrens dprintf_dbuf(db, "size=%llx\n", (u_longlong_t)db->db.db_size); 1301fa9e4066Sahrens 1302fa9e4066Sahrens ASSERT(db->db.db_size != 0); 1303fa9e4066Sahrens 1304fa9e4066Sahrens /* XXX would be nice to fix up dn_towrite_space[] */ 1305fa9e4066Sahrens 130617f17c2dSbonwick *drp = dr->dr_next; 1307c717a561Smaybee 13083f2366c2SGordon Ross /* 13093f2366c2SGordon Ross * Note that there are three places in dbuf_dirty() 13103f2366c2SGordon Ross * where this dirty record may be put on a list. 13113f2366c2SGordon Ross * Make sure to do a list_remove corresponding to 13123f2366c2SGordon Ross * every one of those list_insert calls. 13133f2366c2SGordon Ross */ 1314c717a561Smaybee if (dr->dr_parent) { 1315c717a561Smaybee mutex_enter(&dr->dr_parent->dt.di.dr_mtx); 1316c717a561Smaybee list_remove(&dr->dr_parent->dt.di.dr_children, dr); 1317c717a561Smaybee mutex_exit(&dr->dr_parent->dt.di.dr_mtx); 13183f2366c2SGordon Ross } else if (db->db_blkid == DMU_SPILL_BLKID || 13193f2366c2SGordon Ross db->db_level+1 == dn->dn_nlevels) { 1320cdb0ab79Smaybee ASSERT(db->db_blkptr == NULL || db->db_parent == dn->dn_dbuf); 1321c717a561Smaybee mutex_enter(&dn->dn_mtx); 1322c717a561Smaybee list_remove(&dn->dn_dirty_records[txg & TXG_MASK], dr); 1323c717a561Smaybee mutex_exit(&dn->dn_mtx); 1324c717a561Smaybee } 1325744947dcSTom Erickson DB_DNODE_EXIT(db); 1326c717a561Smaybee 1327*3b2aab18SMatthew Ahrens if (db->db_state != DB_NOFILL) { 1328*3b2aab18SMatthew Ahrens dbuf_unoverride(dr); 1329c717a561Smaybee 1330c717a561Smaybee ASSERT(db->db_buf != NULL); 1331*3b2aab18SMatthew Ahrens ASSERT(dr->dt.dl.dr_data != NULL); 1332*3b2aab18SMatthew Ahrens if (dr->dt.dl.dr_data != db->db_buf) 1333*3b2aab18SMatthew Ahrens VERIFY(arc_buf_remove_ref(dr->dt.dl.dr_data, db)); 1334c717a561Smaybee } 1335c717a561Smaybee kmem_free(dr, sizeof (dbuf_dirty_record_t)); 1336fa9e4066Sahrens 1337fa9e4066Sahrens ASSERT(db->db_dirtycnt > 0); 1338fa9e4066Sahrens db->db_dirtycnt -= 1; 1339fa9e4066Sahrens 1340c717a561Smaybee if (refcount_remove(&db->db_holds, (void *)(uintptr_t)txg) == 0) { 1341ea8dc4b6Seschrock arc_buf_t *buf = db->db_buf; 1342fa9e4066Sahrens 1343b24ab676SJeff Bonwick ASSERT(db->db_state == DB_NOFILL || arc_released(buf)); 1344ea8dc4b6Seschrock dbuf_set_data(db, NULL); 1345*3b2aab18SMatthew Ahrens VERIFY(arc_buf_remove_ref(buf, db)); 1346fa9e4066Sahrens dbuf_evict(db); 1347*3b2aab18SMatthew Ahrens return (B_TRUE); 1348fa9e4066Sahrens } 1349fa9e4066Sahrens 1350*3b2aab18SMatthew Ahrens return (B_FALSE); 1351fa9e4066Sahrens } 1352fa9e4066Sahrens 1353fa9e4066Sahrens #pragma weak dmu_buf_will_dirty = dbuf_will_dirty 1354fa9e4066Sahrens void 1355fa9e4066Sahrens dbuf_will_dirty(dmu_buf_impl_t *db, dmu_tx_t *tx) 1356fa9e4066Sahrens { 13571ab7f2deSmaybee int rf = DB_RF_MUST_SUCCEED | DB_RF_NOPREFETCH; 1358fa9e4066Sahrens 1359fa9e4066Sahrens ASSERT(tx->tx_txg != 0); 1360fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 1361fa9e4066Sahrens 1362744947dcSTom Erickson DB_DNODE_ENTER(db); 1363744947dcSTom Erickson if (RW_WRITE_HELD(&DB_DNODE(db)->dn_struct_rwlock)) 1364fa9e4066Sahrens rf |= DB_RF_HAVESTRUCT; 1365744947dcSTom Erickson DB_DNODE_EXIT(db); 1366ea8dc4b6Seschrock (void) dbuf_read(db, NULL, rf); 1367c717a561Smaybee (void) dbuf_dirty(db, tx); 1368fa9e4066Sahrens } 1369fa9e4066Sahrens 137082c9918fSTim Haley void 137182c9918fSTim Haley dmu_buf_will_not_fill(dmu_buf_t *db_fake, dmu_tx_t *tx) 137282c9918fSTim Haley { 137382c9918fSTim Haley dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 137482c9918fSTim Haley 137582c9918fSTim Haley db->db_state = DB_NOFILL; 137682c9918fSTim Haley 137782c9918fSTim Haley dmu_buf_will_fill(db_fake, tx); 137882c9918fSTim Haley } 137982c9918fSTim Haley 1380fa9e4066Sahrens void 1381ea8dc4b6Seschrock dmu_buf_will_fill(dmu_buf_t *db_fake, dmu_tx_t *tx) 1382fa9e4066Sahrens { 1383ea8dc4b6Seschrock dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 1384ea8dc4b6Seschrock 13850a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 1386fa9e4066Sahrens ASSERT(tx->tx_txg != 0); 1387fa9e4066Sahrens ASSERT(db->db_level == 0); 1388fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 1389fa9e4066Sahrens 1390ea8dc4b6Seschrock ASSERT(db->db.db_object != DMU_META_DNODE_OBJECT || 1391fa9e4066Sahrens dmu_tx_private_ok(tx)); 1392fa9e4066Sahrens 1393fa9e4066Sahrens dbuf_noread(db); 1394c717a561Smaybee (void) dbuf_dirty(db, tx); 1395fa9e4066Sahrens } 1396fa9e4066Sahrens 1397fa9e4066Sahrens #pragma weak dmu_buf_fill_done = dbuf_fill_done 1398fa9e4066Sahrens /* ARGSUSED */ 1399fa9e4066Sahrens void 1400fa9e4066Sahrens dbuf_fill_done(dmu_buf_impl_t *db, dmu_tx_t *tx) 1401fa9e4066Sahrens { 1402fa9e4066Sahrens mutex_enter(&db->db_mtx); 14039c9dc39aSek DBUF_VERIFY(db); 1404fa9e4066Sahrens 1405fa9e4066Sahrens if (db->db_state == DB_FILL) { 1406c717a561Smaybee if (db->db_level == 0 && db->db_freed_in_flight) { 14070a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 1408fa9e4066Sahrens /* we were freed while filling */ 1409fa9e4066Sahrens /* XXX dbuf_undirty? */ 1410fa9e4066Sahrens bzero(db->db.db_data, db->db.db_size); 1411c717a561Smaybee db->db_freed_in_flight = FALSE; 1412fa9e4066Sahrens } 1413fa9e4066Sahrens db->db_state = DB_CACHED; 1414fa9e4066Sahrens cv_broadcast(&db->db_changed); 1415fa9e4066Sahrens } 1416fa9e4066Sahrens mutex_exit(&db->db_mtx); 1417fa9e4066Sahrens } 1418fa9e4066Sahrens 14192fdbea25SAleksandr Guzovskiy /* 14202fdbea25SAleksandr Guzovskiy * Directly assign a provided arc buf to a given dbuf if it's not referenced 14212fdbea25SAleksandr Guzovskiy * by anybody except our caller. Otherwise copy arcbuf's contents to dbuf. 14222fdbea25SAleksandr Guzovskiy */ 14232fdbea25SAleksandr Guzovskiy void 14242fdbea25SAleksandr Guzovskiy dbuf_assign_arcbuf(dmu_buf_impl_t *db, arc_buf_t *buf, dmu_tx_t *tx) 14252fdbea25SAleksandr Guzovskiy { 14262fdbea25SAleksandr Guzovskiy ASSERT(!refcount_is_zero(&db->db_holds)); 14270a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 14282fdbea25SAleksandr Guzovskiy ASSERT(db->db_level == 0); 14292fdbea25SAleksandr Guzovskiy ASSERT(DBUF_GET_BUFC_TYPE(db) == ARC_BUFC_DATA); 14302fdbea25SAleksandr Guzovskiy ASSERT(buf != NULL); 14312fdbea25SAleksandr Guzovskiy ASSERT(arc_buf_size(buf) == db->db.db_size); 14322fdbea25SAleksandr Guzovskiy ASSERT(tx->tx_txg != 0); 14332fdbea25SAleksandr Guzovskiy 14342fdbea25SAleksandr Guzovskiy arc_return_buf(buf, db); 14352fdbea25SAleksandr Guzovskiy ASSERT(arc_released(buf)); 14362fdbea25SAleksandr Guzovskiy 14372fdbea25SAleksandr Guzovskiy mutex_enter(&db->db_mtx); 14382fdbea25SAleksandr Guzovskiy 14392fdbea25SAleksandr Guzovskiy while (db->db_state == DB_READ || db->db_state == DB_FILL) 14402fdbea25SAleksandr Guzovskiy cv_wait(&db->db_changed, &db->db_mtx); 14412fdbea25SAleksandr Guzovskiy 14422fdbea25SAleksandr Guzovskiy ASSERT(db->db_state == DB_CACHED || db->db_state == DB_UNCACHED); 14432fdbea25SAleksandr Guzovskiy 14442fdbea25SAleksandr Guzovskiy if (db->db_state == DB_CACHED && 14452fdbea25SAleksandr Guzovskiy refcount_count(&db->db_holds) - 1 > db->db_dirtycnt) { 14462fdbea25SAleksandr Guzovskiy mutex_exit(&db->db_mtx); 14472fdbea25SAleksandr Guzovskiy (void) dbuf_dirty(db, tx); 14482fdbea25SAleksandr Guzovskiy bcopy(buf->b_data, db->db.db_data, db->db.db_size); 1449*3b2aab18SMatthew Ahrens VERIFY(arc_buf_remove_ref(buf, db)); 1450c242f9a0Schunli zhang - Sun Microsystems - Irvine United States xuio_stat_wbuf_copied(); 14512fdbea25SAleksandr Guzovskiy return; 14522fdbea25SAleksandr Guzovskiy } 14532fdbea25SAleksandr Guzovskiy 1454c242f9a0Schunli zhang - Sun Microsystems - Irvine United States xuio_stat_wbuf_nocopy(); 14552fdbea25SAleksandr Guzovskiy if (db->db_state == DB_CACHED) { 14562fdbea25SAleksandr Guzovskiy dbuf_dirty_record_t *dr = db->db_last_dirty; 14572fdbea25SAleksandr Guzovskiy 14582fdbea25SAleksandr Guzovskiy ASSERT(db->db_buf != NULL); 14592fdbea25SAleksandr Guzovskiy if (dr != NULL && dr->dr_txg == tx->tx_txg) { 14602fdbea25SAleksandr Guzovskiy ASSERT(dr->dt.dl.dr_data == db->db_buf); 14612fdbea25SAleksandr Guzovskiy if (!arc_released(db->db_buf)) { 14622fdbea25SAleksandr Guzovskiy ASSERT(dr->dt.dl.dr_override_state == 14632fdbea25SAleksandr Guzovskiy DR_OVERRIDDEN); 14642fdbea25SAleksandr Guzovskiy arc_release(db->db_buf, db); 14652fdbea25SAleksandr Guzovskiy } 14662fdbea25SAleksandr Guzovskiy dr->dt.dl.dr_data = buf; 1467*3b2aab18SMatthew Ahrens VERIFY(arc_buf_remove_ref(db->db_buf, db)); 14682fdbea25SAleksandr Guzovskiy } else if (dr == NULL || dr->dt.dl.dr_data != db->db_buf) { 14692fdbea25SAleksandr Guzovskiy arc_release(db->db_buf, db); 1470*3b2aab18SMatthew Ahrens VERIFY(arc_buf_remove_ref(db->db_buf, db)); 14712fdbea25SAleksandr Guzovskiy } 14722fdbea25SAleksandr Guzovskiy db->db_buf = NULL; 14732fdbea25SAleksandr Guzovskiy } 14742fdbea25SAleksandr Guzovskiy ASSERT(db->db_buf == NULL); 14752fdbea25SAleksandr Guzovskiy dbuf_set_data(db, buf); 14762fdbea25SAleksandr Guzovskiy db->db_state = DB_FILL; 14772fdbea25SAleksandr Guzovskiy mutex_exit(&db->db_mtx); 14782fdbea25SAleksandr Guzovskiy (void) dbuf_dirty(db, tx); 14792fdbea25SAleksandr Guzovskiy dbuf_fill_done(db, tx); 14802fdbea25SAleksandr Guzovskiy } 14812fdbea25SAleksandr Guzovskiy 1482ea8dc4b6Seschrock /* 1483ea8dc4b6Seschrock * "Clear" the contents of this dbuf. This will mark the dbuf 1484ea8dc4b6Seschrock * EVICTING and clear *most* of its references. Unfortunetely, 1485ea8dc4b6Seschrock * when we are not holding the dn_dbufs_mtx, we can't clear the 1486ea8dc4b6Seschrock * entry in the dn_dbufs list. We have to wait until dbuf_destroy() 1487ea8dc4b6Seschrock * in this case. For callers from the DMU we will usually see: 1488ea8dc4b6Seschrock * dbuf_clear()->arc_buf_evict()->dbuf_do_evict()->dbuf_destroy() 1489ea8dc4b6Seschrock * For the arc callback, we will usually see: 1490744947dcSTom Erickson * dbuf_do_evict()->dbuf_clear();dbuf_destroy() 1491ea8dc4b6Seschrock * Sometimes, though, we will get a mix of these two: 1492ea8dc4b6Seschrock * DMU: dbuf_clear()->arc_buf_evict() 1493ea8dc4b6Seschrock * ARC: dbuf_do_evict()->dbuf_destroy() 1494ea8dc4b6Seschrock */ 1495ea8dc4b6Seschrock void 1496fa9e4066Sahrens dbuf_clear(dmu_buf_impl_t *db) 1497fa9e4066Sahrens { 1498744947dcSTom Erickson dnode_t *dn; 1499ea8dc4b6Seschrock dmu_buf_impl_t *parent = db->db_parent; 1500744947dcSTom Erickson dmu_buf_impl_t *dndb; 1501ea8dc4b6Seschrock int dbuf_gone = FALSE; 1502fa9e4066Sahrens 1503fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 1504fa9e4066Sahrens ASSERT(refcount_is_zero(&db->db_holds)); 1505fa9e4066Sahrens 1506ea8dc4b6Seschrock dbuf_evict_user(db); 1507ea8dc4b6Seschrock 1508fa9e4066Sahrens if (db->db_state == DB_CACHED) { 1509ea8dc4b6Seschrock ASSERT(db->db.db_data != NULL); 15100a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 1511ea8dc4b6Seschrock zio_buf_free(db->db.db_data, DN_MAX_BONUSLEN); 15125a98e54bSBrendan Gregg - Sun Microsystems arc_space_return(DN_MAX_BONUSLEN, ARC_SPACE_OTHER); 15130e8c6158Smaybee } 1514fa9e4066Sahrens db->db.db_data = NULL; 1515fa9e4066Sahrens db->db_state = DB_UNCACHED; 1516fa9e4066Sahrens } 1517fa9e4066Sahrens 151882c9918fSTim Haley ASSERT(db->db_state == DB_UNCACHED || db->db_state == DB_NOFILL); 1519fa9e4066Sahrens ASSERT(db->db_data_pending == NULL); 1520fa9e4066Sahrens 1521ea8dc4b6Seschrock db->db_state = DB_EVICTING; 1522ea8dc4b6Seschrock db->db_blkptr = NULL; 1523ea8dc4b6Seschrock 1524744947dcSTom Erickson DB_DNODE_ENTER(db); 1525744947dcSTom Erickson dn = DB_DNODE(db); 1526744947dcSTom Erickson dndb = dn->dn_dbuf; 15270a586ceaSMark Shellenbaum if (db->db_blkid != DMU_BONUS_BLKID && MUTEX_HELD(&dn->dn_dbufs_mtx)) { 1528ea8dc4b6Seschrock list_remove(&dn->dn_dbufs, db); 1529744947dcSTom Erickson (void) atomic_dec_32_nv(&dn->dn_dbufs_count); 1530744947dcSTom Erickson membar_producer(); 1531744947dcSTom Erickson DB_DNODE_EXIT(db); 1532744947dcSTom Erickson /* 1533744947dcSTom Erickson * Decrementing the dbuf count means that the hold corresponding 1534744947dcSTom Erickson * to the removed dbuf is no longer discounted in dnode_move(), 1535744947dcSTom Erickson * so the dnode cannot be moved until after we release the hold. 1536744947dcSTom Erickson * The membar_producer() ensures visibility of the decremented 1537744947dcSTom Erickson * value in dnode_move(), since DB_DNODE_EXIT doesn't actually 1538744947dcSTom Erickson * release any lock. 1539744947dcSTom Erickson */ 1540ea8dc4b6Seschrock dnode_rele(dn, db); 1541744947dcSTom Erickson db->db_dnode_handle = NULL; 1542744947dcSTom Erickson } else { 1543744947dcSTom Erickson DB_DNODE_EXIT(db); 1544ea8dc4b6Seschrock } 1545ea8dc4b6Seschrock 1546ea8dc4b6Seschrock if (db->db_buf) 1547ea8dc4b6Seschrock dbuf_gone = arc_buf_evict(db->db_buf); 1548ea8dc4b6Seschrock 1549ea8dc4b6Seschrock if (!dbuf_gone) 1550ea8dc4b6Seschrock mutex_exit(&db->db_mtx); 1551fa9e4066Sahrens 1552fa9e4066Sahrens /* 1553744947dcSTom Erickson * If this dbuf is referenced from an indirect dbuf, 1554fa9e4066Sahrens * decrement the ref count on the indirect dbuf. 1555fa9e4066Sahrens */ 1556c543ec06Sahrens if (parent && parent != dndb) 1557ea8dc4b6Seschrock dbuf_rele(parent, db); 1558fa9e4066Sahrens } 1559fa9e4066Sahrens 1560fa9e4066Sahrens static int 1561fa9e4066Sahrens dbuf_findbp(dnode_t *dn, int level, uint64_t blkid, int fail_sparse, 1562fa9e4066Sahrens dmu_buf_impl_t **parentp, blkptr_t **bpp) 1563fa9e4066Sahrens { 1564fa9e4066Sahrens int nlevels, epbs; 1565fa9e4066Sahrens 15660b69c2f0Sahrens *parentp = NULL; 15670b69c2f0Sahrens *bpp = NULL; 15680b69c2f0Sahrens 15690a586ceaSMark Shellenbaum ASSERT(blkid != DMU_BONUS_BLKID); 15700a586ceaSMark Shellenbaum 15710a586ceaSMark Shellenbaum if (blkid == DMU_SPILL_BLKID) { 15720a586ceaSMark Shellenbaum mutex_enter(&dn->dn_mtx); 157306e0070dSMark Shellenbaum if (dn->dn_have_spill && 157406e0070dSMark Shellenbaum (dn->dn_phys->dn_flags & DNODE_FLAG_SPILL_BLKPTR)) 15750a586ceaSMark Shellenbaum *bpp = &dn->dn_phys->dn_spill; 15760a586ceaSMark Shellenbaum else 15770a586ceaSMark Shellenbaum *bpp = NULL; 15780a586ceaSMark Shellenbaum dbuf_add_ref(dn->dn_dbuf, NULL); 15790a586ceaSMark Shellenbaum *parentp = dn->dn_dbuf; 15800a586ceaSMark Shellenbaum mutex_exit(&dn->dn_mtx); 15810a586ceaSMark Shellenbaum return (0); 15820a586ceaSMark Shellenbaum } 1583ea8dc4b6Seschrock 1584fa9e4066Sahrens if (dn->dn_phys->dn_nlevels == 0) 1585fa9e4066Sahrens nlevels = 1; 1586fa9e4066Sahrens else 1587fa9e4066Sahrens nlevels = dn->dn_phys->dn_nlevels; 1588fa9e4066Sahrens 1589fa9e4066Sahrens epbs = dn->dn_indblkshift - SPA_BLKPTRSHIFT; 1590fa9e4066Sahrens 1591fa9e4066Sahrens ASSERT3U(level * epbs, <, 64); 1592fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 1593ea8dc4b6Seschrock if (level >= nlevels || 1594fa9e4066Sahrens (blkid > (dn->dn_phys->dn_maxblkid >> (level * epbs)))) { 1595fa9e4066Sahrens /* the buffer has no parent yet */ 1596fa9e4066Sahrens return (ENOENT); 1597fa9e4066Sahrens } else if (level < nlevels-1) { 1598fa9e4066Sahrens /* this block is referenced from an indirect block */ 1599fa9e4066Sahrens int err = dbuf_hold_impl(dn, level+1, 1600fa9e4066Sahrens blkid >> epbs, fail_sparse, NULL, parentp); 1601fa9e4066Sahrens if (err) 1602fa9e4066Sahrens return (err); 1603ea8dc4b6Seschrock err = dbuf_read(*parentp, NULL, 1604ea8dc4b6Seschrock (DB_RF_HAVESTRUCT | DB_RF_NOPREFETCH | DB_RF_CANFAIL)); 1605c543ec06Sahrens if (err) { 1606c543ec06Sahrens dbuf_rele(*parentp, NULL); 1607c543ec06Sahrens *parentp = NULL; 1608c543ec06Sahrens return (err); 1609ea8dc4b6Seschrock } 1610c543ec06Sahrens *bpp = ((blkptr_t *)(*parentp)->db.db_data) + 1611c543ec06Sahrens (blkid & ((1ULL << epbs) - 1)); 1612c543ec06Sahrens return (0); 1613fa9e4066Sahrens } else { 1614fa9e4066Sahrens /* the block is referenced from the dnode */ 1615fa9e4066Sahrens ASSERT3U(level, ==, nlevels-1); 1616fa9e4066Sahrens ASSERT(dn->dn_phys->dn_nblkptr == 0 || 1617fa9e4066Sahrens blkid < dn->dn_phys->dn_nblkptr); 1618c543ec06Sahrens if (dn->dn_dbuf) { 1619c543ec06Sahrens dbuf_add_ref(dn->dn_dbuf, NULL); 1620c543ec06Sahrens *parentp = dn->dn_dbuf; 1621c543ec06Sahrens } 1622fa9e4066Sahrens *bpp = &dn->dn_phys->dn_blkptr[blkid]; 1623fa9e4066Sahrens return (0); 1624fa9e4066Sahrens } 1625fa9e4066Sahrens } 1626fa9e4066Sahrens 1627fa9e4066Sahrens static dmu_buf_impl_t * 1628fa9e4066Sahrens dbuf_create(dnode_t *dn, uint8_t level, uint64_t blkid, 1629fa9e4066Sahrens dmu_buf_impl_t *parent, blkptr_t *blkptr) 1630fa9e4066Sahrens { 1631503ad85cSMatthew Ahrens objset_t *os = dn->dn_objset; 1632fa9e4066Sahrens dmu_buf_impl_t *db, *odb; 1633fa9e4066Sahrens 1634fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 1635fa9e4066Sahrens ASSERT(dn->dn_type != DMU_OT_NONE); 1636fa9e4066Sahrens 1637fa9e4066Sahrens db = kmem_cache_alloc(dbuf_cache, KM_SLEEP); 1638fa9e4066Sahrens 1639fa9e4066Sahrens db->db_objset = os; 1640fa9e4066Sahrens db->db.db_object = dn->dn_object; 1641fa9e4066Sahrens db->db_level = level; 1642fa9e4066Sahrens db->db_blkid = blkid; 1643c717a561Smaybee db->db_last_dirty = NULL; 1644ea8dc4b6Seschrock db->db_dirtycnt = 0; 1645744947dcSTom Erickson db->db_dnode_handle = dn->dn_handle; 1646ea8dc4b6Seschrock db->db_parent = parent; 1647ea8dc4b6Seschrock db->db_blkptr = blkptr; 1648fa9e4066Sahrens 1649c717a561Smaybee db->db_user_ptr = NULL; 1650c717a561Smaybee db->db_user_data_ptr_ptr = NULL; 1651c717a561Smaybee db->db_evict_func = NULL; 1652c717a561Smaybee db->db_immediate_evict = 0; 1653c717a561Smaybee db->db_freed_in_flight = 0; 1654ea8dc4b6Seschrock 16550a586ceaSMark Shellenbaum if (blkid == DMU_BONUS_BLKID) { 1656ea8dc4b6Seschrock ASSERT3P(parent, ==, dn->dn_dbuf); 16571934e92fSmaybee db->db.db_size = DN_MAX_BONUSLEN - 16581934e92fSmaybee (dn->dn_nblkptr-1) * sizeof (blkptr_t); 16591934e92fSmaybee ASSERT3U(db->db.db_size, >=, dn->dn_bonuslen); 16600a586ceaSMark Shellenbaum db->db.db_offset = DMU_BONUS_BLKID; 1661ea8dc4b6Seschrock db->db_state = DB_UNCACHED; 1662ea8dc4b6Seschrock /* the bonus dbuf is not placed in the hash table */ 16635a98e54bSBrendan Gregg - Sun Microsystems arc_space_consume(sizeof (dmu_buf_impl_t), ARC_SPACE_OTHER); 1664ea8dc4b6Seschrock return (db); 16650a586ceaSMark Shellenbaum } else if (blkid == DMU_SPILL_BLKID) { 16660a586ceaSMark Shellenbaum db->db.db_size = (blkptr != NULL) ? 16670a586ceaSMark Shellenbaum BP_GET_LSIZE(blkptr) : SPA_MINBLOCKSIZE; 16680a586ceaSMark Shellenbaum db->db.db_offset = 0; 1669fa9e4066Sahrens } else { 1670fa9e4066Sahrens int blocksize = 1671fa9e4066Sahrens db->db_level ? 1<<dn->dn_indblkshift : dn->dn_datablksz; 1672fa9e4066Sahrens db->db.db_size = blocksize; 1673fa9e4066Sahrens db->db.db_offset = db->db_blkid * blocksize; 1674fa9e4066Sahrens } 1675fa9e4066Sahrens 1676fa9e4066Sahrens /* 1677fa9e4066Sahrens * Hold the dn_dbufs_mtx while we get the new dbuf 1678fa9e4066Sahrens * in the hash table *and* added to the dbufs list. 1679fa9e4066Sahrens * This prevents a possible deadlock with someone 1680fa9e4066Sahrens * trying to look up this dbuf before its added to the 1681fa9e4066Sahrens * dn_dbufs list. 1682fa9e4066Sahrens */ 1683fa9e4066Sahrens mutex_enter(&dn->dn_dbufs_mtx); 1684ea8dc4b6Seschrock db->db_state = DB_EVICTING; 1685fa9e4066Sahrens if ((odb = dbuf_hash_insert(db)) != NULL) { 1686fa9e4066Sahrens /* someone else inserted it first */ 1687fa9e4066Sahrens kmem_cache_free(dbuf_cache, db); 1688fa9e4066Sahrens mutex_exit(&dn->dn_dbufs_mtx); 1689fa9e4066Sahrens return (odb); 1690fa9e4066Sahrens } 1691fa9e4066Sahrens list_insert_head(&dn->dn_dbufs, db); 1692ea8dc4b6Seschrock db->db_state = DB_UNCACHED; 1693fa9e4066Sahrens mutex_exit(&dn->dn_dbufs_mtx); 16945a98e54bSBrendan Gregg - Sun Microsystems arc_space_consume(sizeof (dmu_buf_impl_t), ARC_SPACE_OTHER); 1695fa9e4066Sahrens 1696fa9e4066Sahrens if (parent && parent != dn->dn_dbuf) 1697fa9e4066Sahrens dbuf_add_ref(parent, db); 1698fa9e4066Sahrens 1699ea8dc4b6Seschrock ASSERT(dn->dn_object == DMU_META_DNODE_OBJECT || 1700ea8dc4b6Seschrock refcount_count(&dn->dn_holds) > 0); 1701fa9e4066Sahrens (void) refcount_add(&dn->dn_holds, db); 1702744947dcSTom Erickson (void) atomic_inc_32_nv(&dn->dn_dbufs_count); 1703fa9e4066Sahrens 1704fa9e4066Sahrens dprintf_dbuf(db, "db=%p\n", db); 1705fa9e4066Sahrens 1706fa9e4066Sahrens return (db); 1707fa9e4066Sahrens } 1708fa9e4066Sahrens 1709fa9e4066Sahrens static int 1710ea8dc4b6Seschrock dbuf_do_evict(void *private) 1711fa9e4066Sahrens { 1712ea8dc4b6Seschrock arc_buf_t *buf = private; 1713ea8dc4b6Seschrock dmu_buf_impl_t *db = buf->b_private; 1714fa9e4066Sahrens 1715ea8dc4b6Seschrock if (!MUTEX_HELD(&db->db_mtx)) 1716ea8dc4b6Seschrock mutex_enter(&db->db_mtx); 1717fa9e4066Sahrens 1718ea8dc4b6Seschrock ASSERT(refcount_is_zero(&db->db_holds)); 1719fa9e4066Sahrens 1720ea8dc4b6Seschrock if (db->db_state != DB_EVICTING) { 1721ea8dc4b6Seschrock ASSERT(db->db_state == DB_CACHED); 1722ea8dc4b6Seschrock DBUF_VERIFY(db); 1723ea8dc4b6Seschrock db->db_buf = NULL; 1724ea8dc4b6Seschrock dbuf_evict(db); 1725ea8dc4b6Seschrock } else { 1726ea8dc4b6Seschrock mutex_exit(&db->db_mtx); 1727ea8dc4b6Seschrock dbuf_destroy(db); 1728fa9e4066Sahrens } 1729ea8dc4b6Seschrock return (0); 1730fa9e4066Sahrens } 1731fa9e4066Sahrens 1732fa9e4066Sahrens static void 1733fa9e4066Sahrens dbuf_destroy(dmu_buf_impl_t *db) 1734fa9e4066Sahrens { 1735fa9e4066Sahrens ASSERT(refcount_is_zero(&db->db_holds)); 1736fa9e4066Sahrens 17370a586ceaSMark Shellenbaum if (db->db_blkid != DMU_BONUS_BLKID) { 1738ea8dc4b6Seschrock /* 1739ea8dc4b6Seschrock * If this dbuf is still on the dn_dbufs list, 1740ea8dc4b6Seschrock * remove it from that list. 1741ea8dc4b6Seschrock */ 1742744947dcSTom Erickson if (db->db_dnode_handle != NULL) { 1743744947dcSTom Erickson dnode_t *dn; 17441934e92fSmaybee 1745744947dcSTom Erickson DB_DNODE_ENTER(db); 1746744947dcSTom Erickson dn = DB_DNODE(db); 17471934e92fSmaybee mutex_enter(&dn->dn_dbufs_mtx); 1748ea8dc4b6Seschrock list_remove(&dn->dn_dbufs, db); 1749744947dcSTom Erickson (void) atomic_dec_32_nv(&dn->dn_dbufs_count); 1750c543ec06Sahrens mutex_exit(&dn->dn_dbufs_mtx); 1751744947dcSTom Erickson DB_DNODE_EXIT(db); 1752744947dcSTom Erickson /* 1753744947dcSTom Erickson * Decrementing the dbuf count means that the hold 1754744947dcSTom Erickson * corresponding to the removed dbuf is no longer 1755744947dcSTom Erickson * discounted in dnode_move(), so the dnode cannot be 1756744947dcSTom Erickson * moved until after we release the hold. 1757744947dcSTom Erickson */ 1758ea8dc4b6Seschrock dnode_rele(dn, db); 1759744947dcSTom Erickson db->db_dnode_handle = NULL; 1760ea8dc4b6Seschrock } 1761ea8dc4b6Seschrock dbuf_hash_remove(db); 1762ea8dc4b6Seschrock } 1763ea8dc4b6Seschrock db->db_parent = NULL; 1764ea8dc4b6Seschrock db->db_buf = NULL; 1765ea8dc4b6Seschrock 1766f82bfe17Sgw ASSERT(!list_link_active(&db->db_link)); 1767fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 1768fa9e4066Sahrens ASSERT(db->db_hash_next == NULL); 1769fa9e4066Sahrens ASSERT(db->db_blkptr == NULL); 1770fa9e4066Sahrens ASSERT(db->db_data_pending == NULL); 1771fa9e4066Sahrens 1772fa9e4066Sahrens kmem_cache_free(dbuf_cache, db); 17735a98e54bSBrendan Gregg - Sun Microsystems arc_space_return(sizeof (dmu_buf_impl_t), ARC_SPACE_OTHER); 1774fa9e4066Sahrens } 1775fa9e4066Sahrens 1776fa9e4066Sahrens void 1777fa9e4066Sahrens dbuf_prefetch(dnode_t *dn, uint64_t blkid) 1778fa9e4066Sahrens { 177913506d1eSmaybee dmu_buf_impl_t *db = NULL; 1780fa9e4066Sahrens blkptr_t *bp = NULL; 1781fa9e4066Sahrens 17820a586ceaSMark Shellenbaum ASSERT(blkid != DMU_BONUS_BLKID); 1783fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 1784fa9e4066Sahrens 1785fa9e4066Sahrens if (dnode_block_freed(dn, blkid)) 1786fa9e4066Sahrens return; 1787fa9e4066Sahrens 1788fa9e4066Sahrens /* dbuf_find() returns with db_mtx held */ 1789fa9e4066Sahrens if (db = dbuf_find(dn, 0, blkid)) { 17909e9c486fSGeorge Wilson /* 17919e9c486fSGeorge Wilson * This dbuf is already in the cache. We assume that 17929e9c486fSGeorge Wilson * it is already CACHED, or else about to be either 17939e9c486fSGeorge Wilson * read or filled. 17949e9c486fSGeorge Wilson */ 1795fa9e4066Sahrens mutex_exit(&db->db_mtx); 17969e9c486fSGeorge Wilson return; 1797fa9e4066Sahrens } 1798fa9e4066Sahrens 179913506d1eSmaybee if (dbuf_findbp(dn, 0, blkid, TRUE, &db, &bp) == 0) { 1800fa9e4066Sahrens if (bp && !BP_IS_HOLE(bp)) { 1801c7cd2421SGeorge Wilson int priority = dn->dn_type == DMU_OT_DDT_ZAP ? 1802c7cd2421SGeorge Wilson ZIO_PRIORITY_DDT_PREFETCH : ZIO_PRIORITY_ASYNC_READ; 1803b24ab676SJeff Bonwick dsl_dataset_t *ds = dn->dn_objset->os_dsl_dataset; 180413506d1eSmaybee uint32_t aflags = ARC_NOWAIT | ARC_PREFETCH; 1805ea8dc4b6Seschrock zbookmark_t zb; 1806b24ab676SJeff Bonwick 1807b24ab676SJeff Bonwick SET_BOOKMARK(&zb, ds ? ds->ds_object : DMU_META_OBJSET, 1808b24ab676SJeff Bonwick dn->dn_object, 0, blkid); 1809ea8dc4b6Seschrock 18101b912ec7SGeorge Wilson (void) arc_read(NULL, dn->dn_objset->os_spa, 18111b912ec7SGeorge Wilson bp, NULL, NULL, priority, 1812fa9e4066Sahrens ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE, 181313506d1eSmaybee &aflags, &zb); 1814fa9e4066Sahrens } 181513506d1eSmaybee if (db) 181613506d1eSmaybee dbuf_rele(db, NULL); 1817fa9e4066Sahrens } 1818fa9e4066Sahrens } 1819fa9e4066Sahrens 1820fa9e4066Sahrens /* 1821fa9e4066Sahrens * Returns with db_holds incremented, and db_mtx not held. 1822fa9e4066Sahrens * Note: dn_struct_rwlock must be held. 1823fa9e4066Sahrens */ 1824fa9e4066Sahrens int 1825fa9e4066Sahrens dbuf_hold_impl(dnode_t *dn, uint8_t level, uint64_t blkid, int fail_sparse, 1826fa9e4066Sahrens void *tag, dmu_buf_impl_t **dbp) 1827fa9e4066Sahrens { 1828fa9e4066Sahrens dmu_buf_impl_t *db, *parent = NULL; 1829fa9e4066Sahrens 18300a586ceaSMark Shellenbaum ASSERT(blkid != DMU_BONUS_BLKID); 1831fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 1832fa9e4066Sahrens ASSERT3U(dn->dn_nlevels, >, level); 1833fa9e4066Sahrens 1834fa9e4066Sahrens *dbp = NULL; 1835ea8dc4b6Seschrock top: 1836fa9e4066Sahrens /* dbuf_find() returns with db_mtx held */ 1837fa9e4066Sahrens db = dbuf_find(dn, level, blkid); 1838fa9e4066Sahrens 1839fa9e4066Sahrens if (db == NULL) { 1840fa9e4066Sahrens blkptr_t *bp = NULL; 1841fa9e4066Sahrens int err; 1842fa9e4066Sahrens 1843c543ec06Sahrens ASSERT3P(parent, ==, NULL); 1844fa9e4066Sahrens err = dbuf_findbp(dn, level, blkid, fail_sparse, &parent, &bp); 1845fa9e4066Sahrens if (fail_sparse) { 1846fa9e4066Sahrens if (err == 0 && bp && BP_IS_HOLE(bp)) 1847fa9e4066Sahrens err = ENOENT; 1848fa9e4066Sahrens if (err) { 1849c543ec06Sahrens if (parent) 1850ea8dc4b6Seschrock dbuf_rele(parent, NULL); 1851fa9e4066Sahrens return (err); 1852fa9e4066Sahrens } 1853fa9e4066Sahrens } 1854ea8dc4b6Seschrock if (err && err != ENOENT) 1855ea8dc4b6Seschrock return (err); 1856fa9e4066Sahrens db = dbuf_create(dn, level, blkid, parent, bp); 1857fa9e4066Sahrens } 1858fa9e4066Sahrens 1859ea8dc4b6Seschrock if (db->db_buf && refcount_is_zero(&db->db_holds)) { 1860ea8dc4b6Seschrock arc_buf_add_ref(db->db_buf, db); 1861ea8dc4b6Seschrock if (db->db_buf->b_data == NULL) { 1862ea8dc4b6Seschrock dbuf_clear(db); 1863c543ec06Sahrens if (parent) { 1864c543ec06Sahrens dbuf_rele(parent, NULL); 1865c543ec06Sahrens parent = NULL; 1866c543ec06Sahrens } 1867ea8dc4b6Seschrock goto top; 1868ea8dc4b6Seschrock } 1869ea8dc4b6Seschrock ASSERT3P(db->db.db_data, ==, db->db_buf->b_data); 1870ea8dc4b6Seschrock } 1871ea8dc4b6Seschrock 1872ea8dc4b6Seschrock ASSERT(db->db_buf == NULL || arc_referenced(db->db_buf)); 1873ea8dc4b6Seschrock 1874fa9e4066Sahrens /* 1875c717a561Smaybee * If this buffer is currently syncing out, and we are are 1876c717a561Smaybee * still referencing it from db_data, we need to make a copy 1877c717a561Smaybee * of it in case we decide we want to dirty it again in this txg. 1878fa9e4066Sahrens */ 18790a586ceaSMark Shellenbaum if (db->db_level == 0 && db->db_blkid != DMU_BONUS_BLKID && 1880ea8dc4b6Seschrock dn->dn_object != DMU_META_DNODE_OBJECT && 1881c717a561Smaybee db->db_state == DB_CACHED && db->db_data_pending) { 1882c717a561Smaybee dbuf_dirty_record_t *dr = db->db_data_pending; 1883fa9e4066Sahrens 1884c717a561Smaybee if (dr->dt.dl.dr_data == db->db_buf) { 1885c717a561Smaybee arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 1886c717a561Smaybee 1887c717a561Smaybee dbuf_set_data(db, 1888744947dcSTom Erickson arc_buf_alloc(dn->dn_objset->os_spa, 1889c717a561Smaybee db->db.db_size, db, type)); 1890c717a561Smaybee bcopy(dr->dt.dl.dr_data->b_data, db->db.db_data, 1891c717a561Smaybee db->db.db_size); 1892c717a561Smaybee } 1893fa9e4066Sahrens } 1894fa9e4066Sahrens 1895ea8dc4b6Seschrock (void) refcount_add(&db->db_holds, tag); 1896fa9e4066Sahrens dbuf_update_data(db); 18979c9dc39aSek DBUF_VERIFY(db); 1898fa9e4066Sahrens mutex_exit(&db->db_mtx); 1899fa9e4066Sahrens 1900fa9e4066Sahrens /* NOTE: we can't rele the parent until after we drop the db_mtx */ 1901c543ec06Sahrens if (parent) 1902ea8dc4b6Seschrock dbuf_rele(parent, NULL); 1903fa9e4066Sahrens 1904744947dcSTom Erickson ASSERT3P(DB_DNODE(db), ==, dn); 1905fa9e4066Sahrens ASSERT3U(db->db_blkid, ==, blkid); 1906fa9e4066Sahrens ASSERT3U(db->db_level, ==, level); 1907fa9e4066Sahrens *dbp = db; 1908fa9e4066Sahrens 1909fa9e4066Sahrens return (0); 1910fa9e4066Sahrens } 1911fa9e4066Sahrens 1912fa9e4066Sahrens dmu_buf_impl_t * 1913ea8dc4b6Seschrock dbuf_hold(dnode_t *dn, uint64_t blkid, void *tag) 1914fa9e4066Sahrens { 1915fa9e4066Sahrens dmu_buf_impl_t *db; 1916ea8dc4b6Seschrock int err = dbuf_hold_impl(dn, 0, blkid, FALSE, tag, &db); 1917ea8dc4b6Seschrock return (err ? NULL : db); 1918fa9e4066Sahrens } 1919fa9e4066Sahrens 1920fa9e4066Sahrens dmu_buf_impl_t * 1921fa9e4066Sahrens dbuf_hold_level(dnode_t *dn, int level, uint64_t blkid, void *tag) 1922fa9e4066Sahrens { 1923fa9e4066Sahrens dmu_buf_impl_t *db; 1924ea8dc4b6Seschrock int err = dbuf_hold_impl(dn, level, blkid, FALSE, tag, &db); 1925ea8dc4b6Seschrock return (err ? NULL : db); 1926fa9e4066Sahrens } 1927fa9e4066Sahrens 19281934e92fSmaybee void 1929ea8dc4b6Seschrock dbuf_create_bonus(dnode_t *dn) 1930fa9e4066Sahrens { 1931ea8dc4b6Seschrock ASSERT(RW_WRITE_HELD(&dn->dn_struct_rwlock)); 1932ea8dc4b6Seschrock 1933ea8dc4b6Seschrock ASSERT(dn->dn_bonus == NULL); 19340a586ceaSMark Shellenbaum dn->dn_bonus = dbuf_create(dn, 0, DMU_BONUS_BLKID, dn->dn_dbuf, NULL); 19350a586ceaSMark Shellenbaum } 19360a586ceaSMark Shellenbaum 19370a586ceaSMark Shellenbaum int 19380a586ceaSMark Shellenbaum dbuf_spill_set_blksz(dmu_buf_t *db_fake, uint64_t blksz, dmu_tx_t *tx) 19390a586ceaSMark Shellenbaum { 19400a586ceaSMark Shellenbaum dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 1941744947dcSTom Erickson dnode_t *dn; 1942744947dcSTom Erickson 19430a586ceaSMark Shellenbaum if (db->db_blkid != DMU_SPILL_BLKID) 19440a586ceaSMark Shellenbaum return (ENOTSUP); 19450a586ceaSMark Shellenbaum if (blksz == 0) 19460a586ceaSMark Shellenbaum blksz = SPA_MINBLOCKSIZE; 19470a586ceaSMark Shellenbaum if (blksz > SPA_MAXBLOCKSIZE) 19480a586ceaSMark Shellenbaum blksz = SPA_MAXBLOCKSIZE; 19490a586ceaSMark Shellenbaum else 19500a586ceaSMark Shellenbaum blksz = P2ROUNDUP(blksz, SPA_MINBLOCKSIZE); 19510a586ceaSMark Shellenbaum 1952744947dcSTom Erickson DB_DNODE_ENTER(db); 1953744947dcSTom Erickson dn = DB_DNODE(db); 1954744947dcSTom Erickson rw_enter(&dn->dn_struct_rwlock, RW_WRITER); 19550a586ceaSMark Shellenbaum dbuf_new_size(db, blksz, tx); 1956744947dcSTom Erickson rw_exit(&dn->dn_struct_rwlock); 1957744947dcSTom Erickson DB_DNODE_EXIT(db); 19580a586ceaSMark Shellenbaum 19590a586ceaSMark Shellenbaum return (0); 19600a586ceaSMark Shellenbaum } 19610a586ceaSMark Shellenbaum 19620a586ceaSMark Shellenbaum void 19630a586ceaSMark Shellenbaum dbuf_rm_spill(dnode_t *dn, dmu_tx_t *tx) 19640a586ceaSMark Shellenbaum { 19650a586ceaSMark Shellenbaum dbuf_free_range(dn, DMU_SPILL_BLKID, DMU_SPILL_BLKID, tx); 1966fa9e4066Sahrens } 1967fa9e4066Sahrens 1968ea8dc4b6Seschrock #pragma weak dmu_buf_add_ref = dbuf_add_ref 1969fa9e4066Sahrens void 1970fa9e4066Sahrens dbuf_add_ref(dmu_buf_impl_t *db, void *tag) 1971fa9e4066Sahrens { 1972ea8dc4b6Seschrock int64_t holds = refcount_add(&db->db_holds, tag); 1973ea8dc4b6Seschrock ASSERT(holds > 1); 1974fa9e4066Sahrens } 1975fa9e4066Sahrens 1976744947dcSTom Erickson /* 1977744947dcSTom Erickson * If you call dbuf_rele() you had better not be referencing the dnode handle 1978744947dcSTom Erickson * unless you have some other direct or indirect hold on the dnode. (An indirect 1979744947dcSTom Erickson * hold is a hold on one of the dnode's dbufs, including the bonus buffer.) 1980744947dcSTom Erickson * Without that, the dbuf_rele() could lead to a dnode_rele() followed by the 1981744947dcSTom Erickson * dnode's parent dbuf evicting its dnode handles. 1982744947dcSTom Erickson */ 1983ea8dc4b6Seschrock #pragma weak dmu_buf_rele = dbuf_rele 1984fa9e4066Sahrens void 1985ea8dc4b6Seschrock dbuf_rele(dmu_buf_impl_t *db, void *tag) 1986b24ab676SJeff Bonwick { 1987b24ab676SJeff Bonwick mutex_enter(&db->db_mtx); 1988b24ab676SJeff Bonwick dbuf_rele_and_unlock(db, tag); 1989b24ab676SJeff Bonwick } 1990b24ab676SJeff Bonwick 1991b24ab676SJeff Bonwick /* 1992b24ab676SJeff Bonwick * dbuf_rele() for an already-locked dbuf. This is necessary to allow 1993b24ab676SJeff Bonwick * db_dirtycnt and db_holds to be updated atomically. 1994b24ab676SJeff Bonwick */ 1995b24ab676SJeff Bonwick void 1996b24ab676SJeff Bonwick dbuf_rele_and_unlock(dmu_buf_impl_t *db, void *tag) 1997fa9e4066Sahrens { 1998fa9e4066Sahrens int64_t holds; 1999fa9e4066Sahrens 2000b24ab676SJeff Bonwick ASSERT(MUTEX_HELD(&db->db_mtx)); 20019c9dc39aSek DBUF_VERIFY(db); 2002fa9e4066Sahrens 2003744947dcSTom Erickson /* 2004744947dcSTom Erickson * Remove the reference to the dbuf before removing its hold on the 2005744947dcSTom Erickson * dnode so we can guarantee in dnode_move() that a referenced bonus 2006744947dcSTom Erickson * buffer has a corresponding dnode hold. 2007744947dcSTom Erickson */ 2008fa9e4066Sahrens holds = refcount_remove(&db->db_holds, tag); 2009ea8dc4b6Seschrock ASSERT(holds >= 0); 2010ea8dc4b6Seschrock 2011c717a561Smaybee /* 2012c717a561Smaybee * We can't freeze indirects if there is a possibility that they 2013c717a561Smaybee * may be modified in the current syncing context. 2014c717a561Smaybee */ 2015c717a561Smaybee if (db->db_buf && holds == (db->db_level == 0 ? db->db_dirtycnt : 0)) 20166b4acc8bSahrens arc_buf_freeze(db->db_buf); 20176b4acc8bSahrens 2018ea8dc4b6Seschrock if (holds == db->db_dirtycnt && 2019c717a561Smaybee db->db_level == 0 && db->db_immediate_evict) 2020ea8dc4b6Seschrock dbuf_evict_user(db); 2021fa9e4066Sahrens 2022fa9e4066Sahrens if (holds == 0) { 20230a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 2024ea8dc4b6Seschrock mutex_exit(&db->db_mtx); 2025744947dcSTom Erickson 2026744947dcSTom Erickson /* 2027744947dcSTom Erickson * If the dnode moves here, we cannot cross this barrier 2028744947dcSTom Erickson * until the move completes. 2029744947dcSTom Erickson */ 2030744947dcSTom Erickson DB_DNODE_ENTER(db); 2031744947dcSTom Erickson (void) atomic_dec_32_nv(&DB_DNODE(db)->dn_dbufs_count); 2032744947dcSTom Erickson DB_DNODE_EXIT(db); 2033744947dcSTom Erickson /* 2034744947dcSTom Erickson * The bonus buffer's dnode hold is no longer discounted 2035744947dcSTom Erickson * in dnode_move(). The dnode cannot move until after 2036744947dcSTom Erickson * the dnode_rele(). 2037744947dcSTom Erickson */ 2038744947dcSTom Erickson dnode_rele(DB_DNODE(db), db); 2039ea8dc4b6Seschrock } else if (db->db_buf == NULL) { 2040ea8dc4b6Seschrock /* 2041ea8dc4b6Seschrock * This is a special case: we never associated this 2042ea8dc4b6Seschrock * dbuf with any data allocated from the ARC. 2043ea8dc4b6Seschrock */ 204482c9918fSTim Haley ASSERT(db->db_state == DB_UNCACHED || 204582c9918fSTim Haley db->db_state == DB_NOFILL); 2046ea8dc4b6Seschrock dbuf_evict(db); 20476b4acc8bSahrens } else if (arc_released(db->db_buf)) { 2048ea8dc4b6Seschrock arc_buf_t *buf = db->db_buf; 2049ea8dc4b6Seschrock /* 2050ea8dc4b6Seschrock * This dbuf has anonymous data associated with it. 2051ea8dc4b6Seschrock */ 2052ea8dc4b6Seschrock dbuf_set_data(db, NULL); 2053*3b2aab18SMatthew Ahrens VERIFY(arc_buf_remove_ref(buf, db)); 2054ea8dc4b6Seschrock dbuf_evict(db); 2055ea8dc4b6Seschrock } else { 2056*3b2aab18SMatthew Ahrens VERIFY(!arc_buf_remove_ref(db->db_buf, db)); 20579253d63dSGeorge Wilson 20589253d63dSGeorge Wilson /* 20599253d63dSGeorge Wilson * A dbuf will be eligible for eviction if either the 20609253d63dSGeorge Wilson * 'primarycache' property is set or a duplicate 20619253d63dSGeorge Wilson * copy of this buffer is already cached in the arc. 20629253d63dSGeorge Wilson * 20639253d63dSGeorge Wilson * In the case of the 'primarycache' a buffer 20649253d63dSGeorge Wilson * is considered for eviction if it matches the 20659253d63dSGeorge Wilson * criteria set in the property. 20669253d63dSGeorge Wilson * 20679253d63dSGeorge Wilson * To decide if our buffer is considered a 20689253d63dSGeorge Wilson * duplicate, we must call into the arc to determine 20699253d63dSGeorge Wilson * if multiple buffers are referencing the same 20709253d63dSGeorge Wilson * block on-disk. If so, then we simply evict 20719253d63dSGeorge Wilson * ourselves. 20729253d63dSGeorge Wilson */ 20739253d63dSGeorge Wilson if (!DBUF_IS_CACHEABLE(db) || 20749253d63dSGeorge Wilson arc_buf_eviction_needed(db->db_buf)) 20753baa08fcSek dbuf_clear(db); 20763baa08fcSek else 20773baa08fcSek mutex_exit(&db->db_mtx); 2078ea8dc4b6Seschrock } 2079fa9e4066Sahrens } else { 2080fa9e4066Sahrens mutex_exit(&db->db_mtx); 2081fa9e4066Sahrens } 2082fa9e4066Sahrens } 2083fa9e4066Sahrens 2084fa9e4066Sahrens #pragma weak dmu_buf_refcount = dbuf_refcount 2085fa9e4066Sahrens uint64_t 2086fa9e4066Sahrens dbuf_refcount(dmu_buf_impl_t *db) 2087fa9e4066Sahrens { 2088fa9e4066Sahrens return (refcount_count(&db->db_holds)); 2089fa9e4066Sahrens } 2090fa9e4066Sahrens 2091fa9e4066Sahrens void * 2092fa9e4066Sahrens dmu_buf_set_user(dmu_buf_t *db_fake, void *user_ptr, void *user_data_ptr_ptr, 2093fa9e4066Sahrens dmu_buf_evict_func_t *evict_func) 2094fa9e4066Sahrens { 2095fa9e4066Sahrens return (dmu_buf_update_user(db_fake, NULL, user_ptr, 2096fa9e4066Sahrens user_data_ptr_ptr, evict_func)); 2097fa9e4066Sahrens } 2098fa9e4066Sahrens 2099fa9e4066Sahrens void * 2100fa9e4066Sahrens dmu_buf_set_user_ie(dmu_buf_t *db_fake, void *user_ptr, void *user_data_ptr_ptr, 2101fa9e4066Sahrens dmu_buf_evict_func_t *evict_func) 2102fa9e4066Sahrens { 2103fa9e4066Sahrens dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 2104fa9e4066Sahrens 2105c717a561Smaybee db->db_immediate_evict = TRUE; 2106fa9e4066Sahrens return (dmu_buf_update_user(db_fake, NULL, user_ptr, 2107fa9e4066Sahrens user_data_ptr_ptr, evict_func)); 2108fa9e4066Sahrens } 2109fa9e4066Sahrens 2110fa9e4066Sahrens void * 2111fa9e4066Sahrens dmu_buf_update_user(dmu_buf_t *db_fake, void *old_user_ptr, void *user_ptr, 2112fa9e4066Sahrens void *user_data_ptr_ptr, dmu_buf_evict_func_t *evict_func) 2113fa9e4066Sahrens { 2114fa9e4066Sahrens dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 2115fa9e4066Sahrens ASSERT(db->db_level == 0); 2116fa9e4066Sahrens 2117fa9e4066Sahrens ASSERT((user_ptr == NULL) == (evict_func == NULL)); 2118fa9e4066Sahrens 2119fa9e4066Sahrens mutex_enter(&db->db_mtx); 2120fa9e4066Sahrens 2121c717a561Smaybee if (db->db_user_ptr == old_user_ptr) { 2122c717a561Smaybee db->db_user_ptr = user_ptr; 2123c717a561Smaybee db->db_user_data_ptr_ptr = user_data_ptr_ptr; 2124c717a561Smaybee db->db_evict_func = evict_func; 2125fa9e4066Sahrens 2126fa9e4066Sahrens dbuf_update_data(db); 2127fa9e4066Sahrens } else { 2128c717a561Smaybee old_user_ptr = db->db_user_ptr; 2129fa9e4066Sahrens } 2130fa9e4066Sahrens 2131fa9e4066Sahrens mutex_exit(&db->db_mtx); 2132fa9e4066Sahrens return (old_user_ptr); 2133fa9e4066Sahrens } 2134fa9e4066Sahrens 2135fa9e4066Sahrens void * 2136fa9e4066Sahrens dmu_buf_get_user(dmu_buf_t *db_fake) 2137fa9e4066Sahrens { 2138fa9e4066Sahrens dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 2139fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 2140fa9e4066Sahrens 2141c717a561Smaybee return (db->db_user_ptr); 2142fa9e4066Sahrens } 2143fa9e4066Sahrens 21443d692628SSanjeev Bagewadi boolean_t 21453d692628SSanjeev Bagewadi dmu_buf_freeable(dmu_buf_t *dbuf) 21463d692628SSanjeev Bagewadi { 21473d692628SSanjeev Bagewadi boolean_t res = B_FALSE; 21483d692628SSanjeev Bagewadi dmu_buf_impl_t *db = (dmu_buf_impl_t *)dbuf; 21493d692628SSanjeev Bagewadi 21503d692628SSanjeev Bagewadi if (db->db_blkptr) 21513d692628SSanjeev Bagewadi res = dsl_dataset_block_freeable(db->db_objset->os_dsl_dataset, 2152c7cd2421SGeorge Wilson db->db_blkptr, db->db_blkptr->blk_birth); 21533d692628SSanjeev Bagewadi 21543d692628SSanjeev Bagewadi return (res); 21553d692628SSanjeev Bagewadi } 21563d692628SSanjeev Bagewadi 215780901aeaSGeorge Wilson blkptr_t * 215880901aeaSGeorge Wilson dmu_buf_get_blkptr(dmu_buf_t *db) 215980901aeaSGeorge Wilson { 216080901aeaSGeorge Wilson dmu_buf_impl_t *dbi = (dmu_buf_impl_t *)db; 216180901aeaSGeorge Wilson return (dbi->db_blkptr); 216280901aeaSGeorge Wilson } 216380901aeaSGeorge Wilson 2164c717a561Smaybee static void 2165c717a561Smaybee dbuf_check_blkptr(dnode_t *dn, dmu_buf_impl_t *db) 2166fa9e4066Sahrens { 2167c717a561Smaybee /* ASSERT(dmu_tx_is_syncing(tx) */ 2168c717a561Smaybee ASSERT(MUTEX_HELD(&db->db_mtx)); 2169c717a561Smaybee 2170c717a561Smaybee if (db->db_blkptr != NULL) 2171c717a561Smaybee return; 2172c717a561Smaybee 21730a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) { 21740a586ceaSMark Shellenbaum db->db_blkptr = &dn->dn_phys->dn_spill; 21750a586ceaSMark Shellenbaum BP_ZERO(db->db_blkptr); 21760a586ceaSMark Shellenbaum return; 21770a586ceaSMark Shellenbaum } 2178c717a561Smaybee if (db->db_level == dn->dn_phys->dn_nlevels-1) { 2179c717a561Smaybee /* 2180c717a561Smaybee * This buffer was allocated at a time when there was 2181c717a561Smaybee * no available blkptrs from the dnode, or it was 2182c717a561Smaybee * inappropriate to hook it in (i.e., nlevels mis-match). 2183c717a561Smaybee */ 2184c717a561Smaybee ASSERT(db->db_blkid < dn->dn_phys->dn_nblkptr); 2185c717a561Smaybee ASSERT(db->db_parent == NULL); 2186c717a561Smaybee db->db_parent = dn->dn_dbuf; 2187c717a561Smaybee db->db_blkptr = &dn->dn_phys->dn_blkptr[db->db_blkid]; 2188c717a561Smaybee DBUF_VERIFY(db); 2189c717a561Smaybee } else { 2190c717a561Smaybee dmu_buf_impl_t *parent = db->db_parent; 2191c717a561Smaybee int epbs = dn->dn_phys->dn_indblkshift - SPA_BLKPTRSHIFT; 2192c717a561Smaybee 2193c717a561Smaybee ASSERT(dn->dn_phys->dn_nlevels > 1); 2194c717a561Smaybee if (parent == NULL) { 2195c717a561Smaybee mutex_exit(&db->db_mtx); 2196c717a561Smaybee rw_enter(&dn->dn_struct_rwlock, RW_READER); 2197c717a561Smaybee (void) dbuf_hold_impl(dn, db->db_level+1, 2198c717a561Smaybee db->db_blkid >> epbs, FALSE, db, &parent); 2199c717a561Smaybee rw_exit(&dn->dn_struct_rwlock); 2200c717a561Smaybee mutex_enter(&db->db_mtx); 2201c717a561Smaybee db->db_parent = parent; 2202c717a561Smaybee } 2203c717a561Smaybee db->db_blkptr = (blkptr_t *)parent->db.db_data + 2204c717a561Smaybee (db->db_blkid & ((1ULL << epbs) - 1)); 2205c717a561Smaybee DBUF_VERIFY(db); 2206c717a561Smaybee } 2207c717a561Smaybee } 2208c717a561Smaybee 2209c717a561Smaybee static void 2210c717a561Smaybee dbuf_sync_indirect(dbuf_dirty_record_t *dr, dmu_tx_t *tx) 2211c717a561Smaybee { 2212c717a561Smaybee dmu_buf_impl_t *db = dr->dr_dbuf; 2213744947dcSTom Erickson dnode_t *dn; 2214c717a561Smaybee zio_t *zio; 2215c717a561Smaybee 2216c717a561Smaybee ASSERT(dmu_tx_is_syncing(tx)); 2217c717a561Smaybee 2218c717a561Smaybee dprintf_dbuf_bp(db, db->db_blkptr, "blkptr=%p", db->db_blkptr); 2219c717a561Smaybee 2220c717a561Smaybee mutex_enter(&db->db_mtx); 2221c717a561Smaybee 2222c717a561Smaybee ASSERT(db->db_level > 0); 2223c717a561Smaybee DBUF_VERIFY(db); 2224c717a561Smaybee 2225c717a561Smaybee if (db->db_buf == NULL) { 2226c717a561Smaybee mutex_exit(&db->db_mtx); 2227c717a561Smaybee (void) dbuf_read(db, NULL, DB_RF_MUST_SUCCEED); 2228c717a561Smaybee mutex_enter(&db->db_mtx); 2229c717a561Smaybee } 2230c717a561Smaybee ASSERT3U(db->db_state, ==, DB_CACHED); 2231c717a561Smaybee ASSERT(db->db_buf != NULL); 2232c717a561Smaybee 2233744947dcSTom Erickson DB_DNODE_ENTER(db); 2234744947dcSTom Erickson dn = DB_DNODE(db); 2235744947dcSTom Erickson ASSERT3U(db->db.db_size, ==, 1<<dn->dn_phys->dn_indblkshift); 2236c717a561Smaybee dbuf_check_blkptr(dn, db); 2237744947dcSTom Erickson DB_DNODE_EXIT(db); 2238c717a561Smaybee 2239c717a561Smaybee db->db_data_pending = dr; 2240c717a561Smaybee 2241af2c4821Smaybee mutex_exit(&db->db_mtx); 2242088f3894Sahrens dbuf_write(dr, db->db_buf, tx); 2243c717a561Smaybee 2244c717a561Smaybee zio = dr->dr_zio; 2245c717a561Smaybee mutex_enter(&dr->dt.di.dr_mtx); 2246c717a561Smaybee dbuf_sync_list(&dr->dt.di.dr_children, tx); 2247c717a561Smaybee ASSERT(list_head(&dr->dt.di.dr_children) == NULL); 2248c717a561Smaybee mutex_exit(&dr->dt.di.dr_mtx); 2249c717a561Smaybee zio_nowait(zio); 2250c717a561Smaybee } 2251c717a561Smaybee 2252c717a561Smaybee static void 2253c717a561Smaybee dbuf_sync_leaf(dbuf_dirty_record_t *dr, dmu_tx_t *tx) 2254c717a561Smaybee { 2255c717a561Smaybee arc_buf_t **datap = &dr->dt.dl.dr_data; 2256c717a561Smaybee dmu_buf_impl_t *db = dr->dr_dbuf; 2257744947dcSTom Erickson dnode_t *dn; 2258744947dcSTom Erickson objset_t *os; 2259c717a561Smaybee uint64_t txg = tx->tx_txg; 2260fa9e4066Sahrens 2261fa9e4066Sahrens ASSERT(dmu_tx_is_syncing(tx)); 2262fa9e4066Sahrens 2263fa9e4066Sahrens dprintf_dbuf_bp(db, db->db_blkptr, "blkptr=%p", db->db_blkptr); 2264fa9e4066Sahrens 2265fa9e4066Sahrens mutex_enter(&db->db_mtx); 2266fa9e4066Sahrens /* 2267fa9e4066Sahrens * To be synced, we must be dirtied. But we 2268fa9e4066Sahrens * might have been freed after the dirty. 2269fa9e4066Sahrens */ 2270fa9e4066Sahrens if (db->db_state == DB_UNCACHED) { 2271fa9e4066Sahrens /* This buffer has been freed since it was dirtied */ 2272fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 2273fa9e4066Sahrens } else if (db->db_state == DB_FILL) { 2274fa9e4066Sahrens /* This buffer was freed and is now being re-filled */ 2275c717a561Smaybee ASSERT(db->db.db_data != dr->dt.dl.dr_data); 2276fa9e4066Sahrens } else { 227782c9918fSTim Haley ASSERT(db->db_state == DB_CACHED || db->db_state == DB_NOFILL); 2278fa9e4066Sahrens } 22799c9dc39aSek DBUF_VERIFY(db); 2280fa9e4066Sahrens 2281744947dcSTom Erickson DB_DNODE_ENTER(db); 2282744947dcSTom Erickson dn = DB_DNODE(db); 2283744947dcSTom Erickson 22840a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) { 22850a586ceaSMark Shellenbaum mutex_enter(&dn->dn_mtx); 22860a586ceaSMark Shellenbaum dn->dn_phys->dn_flags |= DNODE_FLAG_SPILL_BLKPTR; 22870a586ceaSMark Shellenbaum mutex_exit(&dn->dn_mtx); 22880a586ceaSMark Shellenbaum } 22890a586ceaSMark Shellenbaum 2290fa9e4066Sahrens /* 2291c717a561Smaybee * If this is a bonus buffer, simply copy the bonus data into the 2292c717a561Smaybee * dnode. It will be written out when the dnode is synced (and it 2293c717a561Smaybee * will be synced, since it must have been dirty for dbuf_sync to 2294c717a561Smaybee * be called). 2295fa9e4066Sahrens */ 22960a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 2297c717a561Smaybee dbuf_dirty_record_t **drp; 22981934e92fSmaybee 2299ea8dc4b6Seschrock ASSERT(*datap != NULL); 2300fb09f5aaSMadhav Suresh ASSERT0(db->db_level); 2301ea8dc4b6Seschrock ASSERT3U(dn->dn_phys->dn_bonuslen, <=, DN_MAX_BONUSLEN); 2302ea8dc4b6Seschrock bcopy(*datap, DN_BONUS(dn->dn_phys), dn->dn_phys->dn_bonuslen); 2303744947dcSTom Erickson DB_DNODE_EXIT(db); 2304744947dcSTom Erickson 23050e8c6158Smaybee if (*datap != db->db.db_data) { 2306ea8dc4b6Seschrock zio_buf_free(*datap, DN_MAX_BONUSLEN); 23075a98e54bSBrendan Gregg - Sun Microsystems arc_space_return(DN_MAX_BONUSLEN, ARC_SPACE_OTHER); 23080e8c6158Smaybee } 2309ea8dc4b6Seschrock db->db_data_pending = NULL; 2310c717a561Smaybee drp = &db->db_last_dirty; 2311c717a561Smaybee while (*drp != dr) 2312c717a561Smaybee drp = &(*drp)->dr_next; 231317f17c2dSbonwick ASSERT(dr->dr_next == NULL); 2314b24ab676SJeff Bonwick ASSERT(dr->dr_dbuf == db); 231517f17c2dSbonwick *drp = dr->dr_next; 2316c717a561Smaybee kmem_free(dr, sizeof (dbuf_dirty_record_t)); 2317ea8dc4b6Seschrock ASSERT(db->db_dirtycnt > 0); 2318ea8dc4b6Seschrock db->db_dirtycnt -= 1; 2319b24ab676SJeff Bonwick dbuf_rele_and_unlock(db, (void *)(uintptr_t)txg); 2320ea8dc4b6Seschrock return; 2321ea8dc4b6Seschrock } 2322ea8dc4b6Seschrock 2323744947dcSTom Erickson os = dn->dn_objset; 2324744947dcSTom Erickson 2325f82bfe17Sgw /* 2326f82bfe17Sgw * This function may have dropped the db_mtx lock allowing a dmu_sync 2327f82bfe17Sgw * operation to sneak in. As a result, we need to ensure that we 2328f82bfe17Sgw * don't check the dr_override_state until we have returned from 2329f82bfe17Sgw * dbuf_check_blkptr. 2330f82bfe17Sgw */ 2331f82bfe17Sgw dbuf_check_blkptr(dn, db); 2332f82bfe17Sgw 2333c717a561Smaybee /* 2334744947dcSTom Erickson * If this buffer is in the middle of an immediate write, 2335c717a561Smaybee * wait for the synchronous IO to complete. 2336c717a561Smaybee */ 2337c717a561Smaybee while (dr->dt.dl.dr_override_state == DR_IN_DMU_SYNC) { 2338c717a561Smaybee ASSERT(dn->dn_object != DMU_META_DNODE_OBJECT); 2339c717a561Smaybee cv_wait(&db->db_changed, &db->db_mtx); 2340c717a561Smaybee ASSERT(dr->dt.dl.dr_override_state != DR_NOT_OVERRIDDEN); 2341c717a561Smaybee } 2342c5c6ffa0Smaybee 2343ab69d62fSMatthew Ahrens if (db->db_state != DB_NOFILL && 2344ab69d62fSMatthew Ahrens dn->dn_object != DMU_META_DNODE_OBJECT && 2345ab69d62fSMatthew Ahrens refcount_count(&db->db_holds) > 1 && 2346b24ab676SJeff Bonwick dr->dt.dl.dr_override_state != DR_OVERRIDDEN && 2347ab69d62fSMatthew Ahrens *datap == db->db_buf) { 2348ab69d62fSMatthew Ahrens /* 2349ab69d62fSMatthew Ahrens * If this buffer is currently "in use" (i.e., there 2350ab69d62fSMatthew Ahrens * are active holds and db_data still references it), 2351ab69d62fSMatthew Ahrens * then make a copy before we start the write so that 2352ab69d62fSMatthew Ahrens * any modifications from the open txg will not leak 2353ab69d62fSMatthew Ahrens * into this write. 2354ab69d62fSMatthew Ahrens * 2355ab69d62fSMatthew Ahrens * NOTE: this copy does not need to be made for 2356ab69d62fSMatthew Ahrens * objects only modified in the syncing context (e.g. 2357ab69d62fSMatthew Ahrens * DNONE_DNODE blocks). 2358ab69d62fSMatthew Ahrens */ 2359ab69d62fSMatthew Ahrens int blksz = arc_buf_size(*datap); 2360ab69d62fSMatthew Ahrens arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 2361ab69d62fSMatthew Ahrens *datap = arc_buf_alloc(os->os_spa, blksz, db, type); 2362ab69d62fSMatthew Ahrens bcopy(db->db.db_data, (*datap)->b_data, blksz); 236382c9918fSTim Haley } 2364c717a561Smaybee db->db_data_pending = dr; 2365fa9e4066Sahrens 2366c717a561Smaybee mutex_exit(&db->db_mtx); 2367fa9e4066Sahrens 2368088f3894Sahrens dbuf_write(dr, *datap, tx); 2369fa9e4066Sahrens 2370c717a561Smaybee ASSERT(!list_link_active(&dr->dr_dirty_node)); 2371744947dcSTom Erickson if (dn->dn_object == DMU_META_DNODE_OBJECT) { 2372c717a561Smaybee list_insert_tail(&dn->dn_dirty_records[txg&TXG_MASK], dr); 2373744947dcSTom Erickson DB_DNODE_EXIT(db); 2374744947dcSTom Erickson } else { 2375744947dcSTom Erickson /* 2376744947dcSTom Erickson * Although zio_nowait() does not "wait for an IO", it does 2377744947dcSTom Erickson * initiate the IO. If this is an empty write it seems plausible 2378744947dcSTom Erickson * that the IO could actually be completed before the nowait 2379744947dcSTom Erickson * returns. We need to DB_DNODE_EXIT() first in case 2380744947dcSTom Erickson * zio_nowait() invalidates the dbuf. 2381744947dcSTom Erickson */ 2382744947dcSTom Erickson DB_DNODE_EXIT(db); 2383c717a561Smaybee zio_nowait(dr->dr_zio); 2384744947dcSTom Erickson } 2385c717a561Smaybee } 238623b11526Smaybee 2387c717a561Smaybee void 2388c717a561Smaybee dbuf_sync_list(list_t *list, dmu_tx_t *tx) 2389c717a561Smaybee { 2390c717a561Smaybee dbuf_dirty_record_t *dr; 2391c717a561Smaybee 2392c717a561Smaybee while (dr = list_head(list)) { 2393c717a561Smaybee if (dr->dr_zio != NULL) { 2394c717a561Smaybee /* 2395c717a561Smaybee * If we find an already initialized zio then we 2396c717a561Smaybee * are processing the meta-dnode, and we have finished. 2397c717a561Smaybee * The dbufs for all dnodes are put back on the list 2398c717a561Smaybee * during processing, so that we can zio_wait() 2399c717a561Smaybee * these IOs after initiating all child IOs. 2400c717a561Smaybee */ 2401c717a561Smaybee ASSERT3U(dr->dr_dbuf->db.db_object, ==, 2402c717a561Smaybee DMU_META_DNODE_OBJECT); 2403c717a561Smaybee break; 240423b11526Smaybee } 2405c717a561Smaybee list_remove(list, dr); 2406c717a561Smaybee if (dr->dr_dbuf->db_level > 0) 2407c717a561Smaybee dbuf_sync_indirect(dr, tx); 2408c717a561Smaybee else 2409c717a561Smaybee dbuf_sync_leaf(dr, tx); 241023b11526Smaybee } 2411c717a561Smaybee } 241223b11526Smaybee 2413fa9e4066Sahrens /* ARGSUSED */ 2414fa9e4066Sahrens static void 2415c717a561Smaybee dbuf_write_ready(zio_t *zio, arc_buf_t *buf, void *vdb) 2416fa9e4066Sahrens { 2417fa9e4066Sahrens dmu_buf_impl_t *db = vdb; 2418744947dcSTom Erickson dnode_t *dn; 2419e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 2420c717a561Smaybee blkptr_t *bp_orig = &zio->io_bp_orig; 2421b24ab676SJeff Bonwick spa_t *spa = zio->io_spa; 2422b24ab676SJeff Bonwick int64_t delta; 2423fa9e4066Sahrens uint64_t fill = 0; 2424b24ab676SJeff Bonwick int i; 2425fa9e4066Sahrens 2426e14bb325SJeff Bonwick ASSERT(db->db_blkptr == bp); 2427e14bb325SJeff Bonwick 2428744947dcSTom Erickson DB_DNODE_ENTER(db); 2429744947dcSTom Erickson dn = DB_DNODE(db); 2430b24ab676SJeff Bonwick delta = bp_get_dsize_sync(spa, bp) - bp_get_dsize_sync(spa, bp_orig); 2431b24ab676SJeff Bonwick dnode_diduse_space(dn, delta - zio->io_prev_space_delta); 2432b24ab676SJeff Bonwick zio->io_prev_space_delta = delta; 2433fa9e4066Sahrens 2434e14bb325SJeff Bonwick if (BP_IS_HOLE(bp)) { 2435b24ab676SJeff Bonwick ASSERT(bp->blk_fill == 0); 2436744947dcSTom Erickson DB_DNODE_EXIT(db); 2437c717a561Smaybee return; 2438c717a561Smaybee } 2439c5c6ffa0Smaybee 24400a586ceaSMark Shellenbaum ASSERT((db->db_blkid != DMU_SPILL_BLKID && 24410a586ceaSMark Shellenbaum BP_GET_TYPE(bp) == dn->dn_type) || 24420a586ceaSMark Shellenbaum (db->db_blkid == DMU_SPILL_BLKID && 24430a586ceaSMark Shellenbaum BP_GET_TYPE(bp) == dn->dn_bonustype)); 2444e14bb325SJeff Bonwick ASSERT(BP_GET_LEVEL(bp) == db->db_level); 2445e14bb325SJeff Bonwick 2446c717a561Smaybee mutex_enter(&db->db_mtx); 2447fa9e4066Sahrens 24480a586ceaSMark Shellenbaum #ifdef ZFS_DEBUG 24490a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) { 24500a586ceaSMark Shellenbaum ASSERT(dn->dn_phys->dn_flags & DNODE_FLAG_SPILL_BLKPTR); 24510a586ceaSMark Shellenbaum ASSERT(!(BP_IS_HOLE(db->db_blkptr)) && 24520a586ceaSMark Shellenbaum db->db_blkptr == &dn->dn_phys->dn_spill); 24530a586ceaSMark Shellenbaum } 24540a586ceaSMark Shellenbaum #endif 24550a586ceaSMark Shellenbaum 2456fa9e4066Sahrens if (db->db_level == 0) { 2457fa9e4066Sahrens mutex_enter(&dn->dn_mtx); 24580a586ceaSMark Shellenbaum if (db->db_blkid > dn->dn_phys->dn_maxblkid && 24590a586ceaSMark Shellenbaum db->db_blkid != DMU_SPILL_BLKID) 2460fa9e4066Sahrens dn->dn_phys->dn_maxblkid = db->db_blkid; 2461fa9e4066Sahrens mutex_exit(&dn->dn_mtx); 2462fa9e4066Sahrens 2463fa9e4066Sahrens if (dn->dn_type == DMU_OT_DNODE) { 2464fa9e4066Sahrens dnode_phys_t *dnp = db->db.db_data; 2465fa9e4066Sahrens for (i = db->db.db_size >> DNODE_SHIFT; i > 0; 2466fa9e4066Sahrens i--, dnp++) { 2467fa9e4066Sahrens if (dnp->dn_type != DMU_OT_NONE) 2468fa9e4066Sahrens fill++; 2469fa9e4066Sahrens } 2470fa9e4066Sahrens } else { 2471c717a561Smaybee fill = 1; 2472fa9e4066Sahrens } 2473fa9e4066Sahrens } else { 2474e14bb325SJeff Bonwick blkptr_t *ibp = db->db.db_data; 2475fa9e4066Sahrens ASSERT3U(db->db.db_size, ==, 1<<dn->dn_phys->dn_indblkshift); 2476e14bb325SJeff Bonwick for (i = db->db.db_size >> SPA_BLKPTRSHIFT; i > 0; i--, ibp++) { 2477e14bb325SJeff Bonwick if (BP_IS_HOLE(ibp)) 2478fa9e4066Sahrens continue; 2479e14bb325SJeff Bonwick fill += ibp->blk_fill; 2480fa9e4066Sahrens } 2481fa9e4066Sahrens } 2482744947dcSTom Erickson DB_DNODE_EXIT(db); 2483fa9e4066Sahrens 2484e14bb325SJeff Bonwick bp->blk_fill = fill; 2485c717a561Smaybee 2486c717a561Smaybee mutex_exit(&db->db_mtx); 2487c717a561Smaybee } 2488fa9e4066Sahrens 2489c717a561Smaybee /* ARGSUSED */ 2490c717a561Smaybee static void 2491c717a561Smaybee dbuf_write_done(zio_t *zio, arc_buf_t *buf, void *vdb) 2492c717a561Smaybee { 2493c717a561Smaybee dmu_buf_impl_t *db = vdb; 2494b24ab676SJeff Bonwick blkptr_t *bp = zio->io_bp; 2495b24ab676SJeff Bonwick blkptr_t *bp_orig = &zio->io_bp_orig; 2496c717a561Smaybee uint64_t txg = zio->io_txg; 2497c717a561Smaybee dbuf_dirty_record_t **drp, *dr; 2498c717a561Smaybee 2499fb09f5aaSMadhav Suresh ASSERT0(zio->io_error); 2500b24ab676SJeff Bonwick ASSERT(db->db_blkptr == bp); 2501b24ab676SJeff Bonwick 250280901aeaSGeorge Wilson /* 250380901aeaSGeorge Wilson * For nopwrites and rewrites we ensure that the bp matches our 250480901aeaSGeorge Wilson * original and bypass all the accounting. 250580901aeaSGeorge Wilson */ 250680901aeaSGeorge Wilson if (zio->io_flags & (ZIO_FLAG_IO_REWRITE | ZIO_FLAG_NOPWRITE)) { 2507b24ab676SJeff Bonwick ASSERT(BP_EQUAL(bp, bp_orig)); 2508b24ab676SJeff Bonwick } else { 2509744947dcSTom Erickson objset_t *os; 2510744947dcSTom Erickson dsl_dataset_t *ds; 2511744947dcSTom Erickson dmu_tx_t *tx; 2512744947dcSTom Erickson 2513744947dcSTom Erickson DB_GET_OBJSET(&os, db); 2514744947dcSTom Erickson ds = os->os_dsl_dataset; 2515744947dcSTom Erickson tx = os->os_synctx; 2516b24ab676SJeff Bonwick 2517b24ab676SJeff Bonwick (void) dsl_dataset_block_kill(ds, bp_orig, tx, B_TRUE); 2518b24ab676SJeff Bonwick dsl_dataset_block_born(ds, bp, tx); 2519b24ab676SJeff Bonwick } 2520c717a561Smaybee 2521c717a561Smaybee mutex_enter(&db->db_mtx); 2522c717a561Smaybee 2523b24ab676SJeff Bonwick DBUF_VERIFY(db); 2524b24ab676SJeff Bonwick 2525c717a561Smaybee drp = &db->db_last_dirty; 252617f17c2dSbonwick while ((dr = *drp) != db->db_data_pending) 252717f17c2dSbonwick drp = &dr->dr_next; 252817f17c2dSbonwick ASSERT(!list_link_active(&dr->dr_dirty_node)); 252917f17c2dSbonwick ASSERT(dr->dr_txg == txg); 2530b24ab676SJeff Bonwick ASSERT(dr->dr_dbuf == db); 253117f17c2dSbonwick ASSERT(dr->dr_next == NULL); 253217f17c2dSbonwick *drp = dr->dr_next; 2533c717a561Smaybee 25340a586ceaSMark Shellenbaum #ifdef ZFS_DEBUG 25350a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) { 2536744947dcSTom Erickson dnode_t *dn; 2537744947dcSTom Erickson 2538744947dcSTom Erickson DB_DNODE_ENTER(db); 2539744947dcSTom Erickson dn = DB_DNODE(db); 25400a586ceaSMark Shellenbaum ASSERT(dn->dn_phys->dn_flags & DNODE_FLAG_SPILL_BLKPTR); 25410a586ceaSMark Shellenbaum ASSERT(!(BP_IS_HOLE(db->db_blkptr)) && 25420a586ceaSMark Shellenbaum db->db_blkptr == &dn->dn_phys->dn_spill); 2543744947dcSTom Erickson DB_DNODE_EXIT(db); 25440a586ceaSMark Shellenbaum } 25450a586ceaSMark Shellenbaum #endif 25460a586ceaSMark Shellenbaum 2547c717a561Smaybee if (db->db_level == 0) { 25480a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 2549c717a561Smaybee ASSERT(dr->dt.dl.dr_override_state == DR_NOT_OVERRIDDEN); 255082c9918fSTim Haley if (db->db_state != DB_NOFILL) { 255182c9918fSTim Haley if (dr->dt.dl.dr_data != db->db_buf) 255282c9918fSTim Haley VERIFY(arc_buf_remove_ref(dr->dt.dl.dr_data, 2553*3b2aab18SMatthew Ahrens db)); 2554b24ab676SJeff Bonwick else if (!arc_released(db->db_buf)) 255582c9918fSTim Haley arc_set_callback(db->db_buf, dbuf_do_evict, db); 255682c9918fSTim Haley } 2557c717a561Smaybee } else { 2558744947dcSTom Erickson dnode_t *dn; 2559744947dcSTom Erickson 2560744947dcSTom Erickson DB_DNODE_ENTER(db); 2561744947dcSTom Erickson dn = DB_DNODE(db); 2562c717a561Smaybee ASSERT(list_head(&dr->dt.di.dr_children) == NULL); 2563c717a561Smaybee ASSERT3U(db->db.db_size, ==, 1<<dn->dn_phys->dn_indblkshift); 2564c717a561Smaybee if (!BP_IS_HOLE(db->db_blkptr)) { 2565c717a561Smaybee int epbs = 2566c717a561Smaybee dn->dn_phys->dn_indblkshift - SPA_BLKPTRSHIFT; 2567c717a561Smaybee ASSERT3U(BP_GET_LSIZE(db->db_blkptr), ==, 2568c717a561Smaybee db->db.db_size); 2569c717a561Smaybee ASSERT3U(dn->dn_phys->dn_maxblkid 2570c717a561Smaybee >> (db->db_level * epbs), >=, db->db_blkid); 2571c717a561Smaybee arc_set_callback(db->db_buf, dbuf_do_evict, db); 2572c717a561Smaybee } 2573744947dcSTom Erickson DB_DNODE_EXIT(db); 2574c25056deSgw mutex_destroy(&dr->dt.di.dr_mtx); 2575c25056deSgw list_destroy(&dr->dt.di.dr_children); 2576c717a561Smaybee } 2577c717a561Smaybee kmem_free(dr, sizeof (dbuf_dirty_record_t)); 2578fa9e4066Sahrens 2579fa9e4066Sahrens cv_broadcast(&db->db_changed); 2580fa9e4066Sahrens ASSERT(db->db_dirtycnt > 0); 2581fa9e4066Sahrens db->db_dirtycnt -= 1; 2582c717a561Smaybee db->db_data_pending = NULL; 2583b24ab676SJeff Bonwick dbuf_rele_and_unlock(db, (void *)(uintptr_t)txg); 2584b24ab676SJeff Bonwick } 2585b24ab676SJeff Bonwick 2586b24ab676SJeff Bonwick static void 2587b24ab676SJeff Bonwick dbuf_write_nofill_ready(zio_t *zio) 2588b24ab676SJeff Bonwick { 2589b24ab676SJeff Bonwick dbuf_write_ready(zio, NULL, zio->io_private); 2590b24ab676SJeff Bonwick } 2591b24ab676SJeff Bonwick 2592b24ab676SJeff Bonwick static void 2593b24ab676SJeff Bonwick dbuf_write_nofill_done(zio_t *zio) 2594b24ab676SJeff Bonwick { 2595b24ab676SJeff Bonwick dbuf_write_done(zio, NULL, zio->io_private); 2596b24ab676SJeff Bonwick } 2597b24ab676SJeff Bonwick 2598b24ab676SJeff Bonwick static void 2599b24ab676SJeff Bonwick dbuf_write_override_ready(zio_t *zio) 2600b24ab676SJeff Bonwick { 2601b24ab676SJeff Bonwick dbuf_dirty_record_t *dr = zio->io_private; 2602b24ab676SJeff Bonwick dmu_buf_impl_t *db = dr->dr_dbuf; 2603b24ab676SJeff Bonwick 2604b24ab676SJeff Bonwick dbuf_write_ready(zio, NULL, db); 2605b24ab676SJeff Bonwick } 2606b24ab676SJeff Bonwick 2607b24ab676SJeff Bonwick static void 2608b24ab676SJeff Bonwick dbuf_write_override_done(zio_t *zio) 2609b24ab676SJeff Bonwick { 2610b24ab676SJeff Bonwick dbuf_dirty_record_t *dr = zio->io_private; 2611b24ab676SJeff Bonwick dmu_buf_impl_t *db = dr->dr_dbuf; 2612b24ab676SJeff Bonwick blkptr_t *obp = &dr->dt.dl.dr_overridden_by; 2613b24ab676SJeff Bonwick 2614b24ab676SJeff Bonwick mutex_enter(&db->db_mtx); 2615b24ab676SJeff Bonwick if (!BP_EQUAL(zio->io_bp, obp)) { 2616b24ab676SJeff Bonwick if (!BP_IS_HOLE(obp)) 2617b24ab676SJeff Bonwick dsl_free(spa_get_dsl(zio->io_spa), zio->io_txg, obp); 2618b24ab676SJeff Bonwick arc_release(dr->dt.dl.dr_data, db); 2619b24ab676SJeff Bonwick } 2620fa9e4066Sahrens mutex_exit(&db->db_mtx); 2621fa9e4066Sahrens 2622b24ab676SJeff Bonwick dbuf_write_done(zio, NULL, db); 2623b24ab676SJeff Bonwick } 2624b24ab676SJeff Bonwick 2625b24ab676SJeff Bonwick static void 2626b24ab676SJeff Bonwick dbuf_write(dbuf_dirty_record_t *dr, arc_buf_t *data, dmu_tx_t *tx) 2627b24ab676SJeff Bonwick { 2628b24ab676SJeff Bonwick dmu_buf_impl_t *db = dr->dr_dbuf; 2629744947dcSTom Erickson dnode_t *dn; 2630744947dcSTom Erickson objset_t *os; 2631b24ab676SJeff Bonwick dmu_buf_impl_t *parent = db->db_parent; 2632b24ab676SJeff Bonwick uint64_t txg = tx->tx_txg; 2633b24ab676SJeff Bonwick zbookmark_t zb; 2634b24ab676SJeff Bonwick zio_prop_t zp; 2635b24ab676SJeff Bonwick zio_t *zio; 26360a586ceaSMark Shellenbaum int wp_flag = 0; 2637b24ab676SJeff Bonwick 2638744947dcSTom Erickson DB_DNODE_ENTER(db); 2639744947dcSTom Erickson dn = DB_DNODE(db); 2640744947dcSTom Erickson os = dn->dn_objset; 2641744947dcSTom Erickson 2642b24ab676SJeff Bonwick if (db->db_state != DB_NOFILL) { 2643b24ab676SJeff Bonwick if (db->db_level > 0 || dn->dn_type == DMU_OT_DNODE) { 2644b24ab676SJeff Bonwick /* 2645b24ab676SJeff Bonwick * Private object buffers are released here rather 2646b24ab676SJeff Bonwick * than in dbuf_dirty() since they are only modified 2647b24ab676SJeff Bonwick * in the syncing context and we don't want the 2648b24ab676SJeff Bonwick * overhead of making multiple copies of the data. 2649b24ab676SJeff Bonwick */ 2650b24ab676SJeff Bonwick if (BP_IS_HOLE(db->db_blkptr)) { 2651b24ab676SJeff Bonwick arc_buf_thaw(data); 2652b24ab676SJeff Bonwick } else { 26533f9d6ad7SLin Ling dbuf_release_bp(db); 2654b24ab676SJeff Bonwick } 2655b24ab676SJeff Bonwick } 2656b24ab676SJeff Bonwick } 2657b24ab676SJeff Bonwick 2658b24ab676SJeff Bonwick if (parent != dn->dn_dbuf) { 2659b24ab676SJeff Bonwick ASSERT(parent && parent->db_data_pending); 2660b24ab676SJeff Bonwick ASSERT(db->db_level == parent->db_level-1); 2661b24ab676SJeff Bonwick ASSERT(arc_released(parent->db_buf)); 2662b24ab676SJeff Bonwick zio = parent->db_data_pending->dr_zio; 2663b24ab676SJeff Bonwick } else { 26640a586ceaSMark Shellenbaum ASSERT((db->db_level == dn->dn_phys->dn_nlevels-1 && 26650a586ceaSMark Shellenbaum db->db_blkid != DMU_SPILL_BLKID) || 26660a586ceaSMark Shellenbaum (db->db_blkid == DMU_SPILL_BLKID && db->db_level == 0)); 26670a586ceaSMark Shellenbaum if (db->db_blkid != DMU_SPILL_BLKID) 26680a586ceaSMark Shellenbaum ASSERT3P(db->db_blkptr, ==, 26690a586ceaSMark Shellenbaum &dn->dn_phys->dn_blkptr[db->db_blkid]); 2670b24ab676SJeff Bonwick zio = dn->dn_zio; 2671b24ab676SJeff Bonwick } 2672b24ab676SJeff Bonwick 2673b24ab676SJeff Bonwick ASSERT(db->db_level == 0 || data == db->db_buf); 2674b24ab676SJeff Bonwick ASSERT3U(db->db_blkptr->blk_birth, <=, txg); 2675b24ab676SJeff Bonwick ASSERT(zio); 2676fa9e4066Sahrens 2677b24ab676SJeff Bonwick SET_BOOKMARK(&zb, os->os_dsl_dataset ? 2678b24ab676SJeff Bonwick os->os_dsl_dataset->ds_object : DMU_META_OBJSET, 2679b24ab676SJeff Bonwick db->db.db_object, db->db_level, db->db_blkid); 2680b24ab676SJeff Bonwick 26810a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) 26820a586ceaSMark Shellenbaum wp_flag = WP_SPILL; 26830a586ceaSMark Shellenbaum wp_flag |= (db->db_state == DB_NOFILL) ? WP_NOFILL : 0; 26840a586ceaSMark Shellenbaum 26850a586ceaSMark Shellenbaum dmu_write_policy(os, dn, db->db_level, wp_flag, &zp); 2686744947dcSTom Erickson DB_DNODE_EXIT(db); 2687b24ab676SJeff Bonwick 2688b24ab676SJeff Bonwick if (db->db_level == 0 && dr->dt.dl.dr_override_state == DR_OVERRIDDEN) { 2689b24ab676SJeff Bonwick ASSERT(db->db_state != DB_NOFILL); 2690b24ab676SJeff Bonwick dr->dr_zio = zio_write(zio, os->os_spa, txg, 2691b24ab676SJeff Bonwick db->db_blkptr, data->b_data, arc_buf_size(data), &zp, 2692b24ab676SJeff Bonwick dbuf_write_override_ready, dbuf_write_override_done, dr, 2693b24ab676SJeff Bonwick ZIO_PRIORITY_ASYNC_WRITE, ZIO_FLAG_MUSTSUCCEED, &zb); 2694b24ab676SJeff Bonwick mutex_enter(&db->db_mtx); 2695b24ab676SJeff Bonwick dr->dt.dl.dr_override_state = DR_NOT_OVERRIDDEN; 2696b24ab676SJeff Bonwick zio_write_override(dr->dr_zio, &dr->dt.dl.dr_overridden_by, 269780901aeaSGeorge Wilson dr->dt.dl.dr_copies, dr->dt.dl.dr_nopwrite); 2698b24ab676SJeff Bonwick mutex_exit(&db->db_mtx); 2699b24ab676SJeff Bonwick } else if (db->db_state == DB_NOFILL) { 2700b24ab676SJeff Bonwick ASSERT(zp.zp_checksum == ZIO_CHECKSUM_OFF); 2701b24ab676SJeff Bonwick dr->dr_zio = zio_write(zio, os->os_spa, txg, 2702b24ab676SJeff Bonwick db->db_blkptr, NULL, db->db.db_size, &zp, 2703b24ab676SJeff Bonwick dbuf_write_nofill_ready, dbuf_write_nofill_done, db, 2704b24ab676SJeff Bonwick ZIO_PRIORITY_ASYNC_WRITE, 2705b24ab676SJeff Bonwick ZIO_FLAG_MUSTSUCCEED | ZIO_FLAG_NODATA, &zb); 2706b24ab676SJeff Bonwick } else { 2707b24ab676SJeff Bonwick ASSERT(arc_released(data)); 2708b24ab676SJeff Bonwick dr->dr_zio = arc_write(zio, os->os_spa, txg, 2709b24ab676SJeff Bonwick db->db_blkptr, data, DBUF_IS_L2CACHEABLE(db), &zp, 2710b24ab676SJeff Bonwick dbuf_write_ready, dbuf_write_done, db, 2711b24ab676SJeff Bonwick ZIO_PRIORITY_ASYNC_WRITE, ZIO_FLAG_MUSTSUCCEED, &zb); 2712b24ab676SJeff Bonwick } 2713fa9e4066Sahrens } 2714