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. 24be6fd75aSMatthew Ahrens * Copyright (c) 2013 by Delphix. All rights reserved. 25aad02571SSaso Kiselkov * Copyright (c) 2013 by Saso Kiselkov. All rights reserved. 26fa9e4066Sahrens */ 27fa9e4066Sahrens 28fa9e4066Sahrens #include <sys/zfs_context.h> 29fa9e4066Sahrens #include <sys/dmu.h> 30fa9e4066Sahrens #include <sys/dmu_impl.h> 31fa9e4066Sahrens #include <sys/dbuf.h> 32fa9e4066Sahrens #include <sys/dmu_objset.h> 33fa9e4066Sahrens #include <sys/dsl_dataset.h> 34fa9e4066Sahrens #include <sys/dsl_dir.h> 35fa9e4066Sahrens #include <sys/dmu_tx.h> 36fa9e4066Sahrens #include <sys/spa.h> 37fa9e4066Sahrens #include <sys/zio.h> 38fa9e4066Sahrens #include <sys/dmu_zfetch.h> 390a586ceaSMark Shellenbaum #include <sys/sa.h> 400a586ceaSMark Shellenbaum #include <sys/sa_impl.h> 41fa9e4066Sahrens 42fa9e4066Sahrens static void dbuf_destroy(dmu_buf_impl_t *db); 433b2aab18SMatthew Ahrens static boolean_t dbuf_undirty(dmu_buf_impl_t *db, dmu_tx_t *tx); 44088f3894Sahrens static void dbuf_write(dbuf_dirty_record_t *dr, arc_buf_t *data, dmu_tx_t *tx); 45fa9e4066Sahrens 46fa9e4066Sahrens /* 47fa9e4066Sahrens * Global data structures and functions for the dbuf cache. 48fa9e4066Sahrens */ 49fa9e4066Sahrens static kmem_cache_t *dbuf_cache; 50fa9e4066Sahrens 51fa9e4066Sahrens /* ARGSUSED */ 52fa9e4066Sahrens static int 53fa9e4066Sahrens dbuf_cons(void *vdb, void *unused, int kmflag) 54fa9e4066Sahrens { 55fa9e4066Sahrens dmu_buf_impl_t *db = vdb; 56fa9e4066Sahrens bzero(db, sizeof (dmu_buf_impl_t)); 57fa9e4066Sahrens 58fa9e4066Sahrens mutex_init(&db->db_mtx, NULL, MUTEX_DEFAULT, NULL); 59fa9e4066Sahrens cv_init(&db->db_changed, NULL, CV_DEFAULT, NULL); 60fa9e4066Sahrens refcount_create(&db->db_holds); 61fa9e4066Sahrens return (0); 62fa9e4066Sahrens } 63fa9e4066Sahrens 64fa9e4066Sahrens /* ARGSUSED */ 65fa9e4066Sahrens static void 66fa9e4066Sahrens dbuf_dest(void *vdb, void *unused) 67fa9e4066Sahrens { 68fa9e4066Sahrens dmu_buf_impl_t *db = vdb; 69fa9e4066Sahrens mutex_destroy(&db->db_mtx); 70fa9e4066Sahrens cv_destroy(&db->db_changed); 71fa9e4066Sahrens refcount_destroy(&db->db_holds); 72fa9e4066Sahrens } 73fa9e4066Sahrens 74fa9e4066Sahrens /* 75fa9e4066Sahrens * dbuf hash table routines 76fa9e4066Sahrens */ 77fa9e4066Sahrens static dbuf_hash_table_t dbuf_hash_table; 78fa9e4066Sahrens 79fa9e4066Sahrens static uint64_t dbuf_hash_count; 80fa9e4066Sahrens 81fa9e4066Sahrens static uint64_t 82fa9e4066Sahrens dbuf_hash(void *os, uint64_t obj, uint8_t lvl, uint64_t blkid) 83fa9e4066Sahrens { 84fa9e4066Sahrens uintptr_t osv = (uintptr_t)os; 85fa9e4066Sahrens uint64_t crc = -1ULL; 86fa9e4066Sahrens 87fa9e4066Sahrens ASSERT(zfs_crc64_table[128] == ZFS_CRC64_POLY); 88fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (lvl)) & 0xFF]; 89fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (osv >> 6)) & 0xFF]; 90fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (obj >> 0)) & 0xFF]; 91fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (obj >> 8)) & 0xFF]; 92fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (blkid >> 0)) & 0xFF]; 93fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (blkid >> 8)) & 0xFF]; 94fa9e4066Sahrens 95fa9e4066Sahrens crc ^= (osv>>14) ^ (obj>>16) ^ (blkid>>16); 96fa9e4066Sahrens 97fa9e4066Sahrens return (crc); 98fa9e4066Sahrens } 99fa9e4066Sahrens 100fa9e4066Sahrens #define DBUF_HASH(os, obj, level, blkid) dbuf_hash(os, obj, level, blkid); 101fa9e4066Sahrens 102fa9e4066Sahrens #define DBUF_EQUAL(dbuf, os, obj, level, blkid) \ 103fa9e4066Sahrens ((dbuf)->db.db_object == (obj) && \ 104fa9e4066Sahrens (dbuf)->db_objset == (os) && \ 105fa9e4066Sahrens (dbuf)->db_level == (level) && \ 106fa9e4066Sahrens (dbuf)->db_blkid == (blkid)) 107fa9e4066Sahrens 108fa9e4066Sahrens dmu_buf_impl_t * 109fa9e4066Sahrens dbuf_find(dnode_t *dn, uint8_t level, uint64_t blkid) 110fa9e4066Sahrens { 111fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 112503ad85cSMatthew Ahrens objset_t *os = dn->dn_objset; 113fa9e4066Sahrens uint64_t obj = dn->dn_object; 114fa9e4066Sahrens uint64_t hv = DBUF_HASH(os, obj, level, blkid); 115fa9e4066Sahrens uint64_t idx = hv & h->hash_table_mask; 116fa9e4066Sahrens dmu_buf_impl_t *db; 117fa9e4066Sahrens 118fa9e4066Sahrens mutex_enter(DBUF_HASH_MUTEX(h, idx)); 119fa9e4066Sahrens for (db = h->hash_table[idx]; db != NULL; db = db->db_hash_next) { 120fa9e4066Sahrens if (DBUF_EQUAL(db, os, obj, level, blkid)) { 121fa9e4066Sahrens mutex_enter(&db->db_mtx); 122ea8dc4b6Seschrock if (db->db_state != DB_EVICTING) { 123fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 124fa9e4066Sahrens return (db); 125fa9e4066Sahrens } 126fa9e4066Sahrens mutex_exit(&db->db_mtx); 127fa9e4066Sahrens } 128fa9e4066Sahrens } 129fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 130fa9e4066Sahrens return (NULL); 131fa9e4066Sahrens } 132fa9e4066Sahrens 133fa9e4066Sahrens /* 134fa9e4066Sahrens * Insert an entry into the hash table. If there is already an element 135fa9e4066Sahrens * equal to elem in the hash table, then the already existing element 136fa9e4066Sahrens * will be returned and the new element will not be inserted. 137fa9e4066Sahrens * Otherwise returns NULL. 138fa9e4066Sahrens */ 139fa9e4066Sahrens static dmu_buf_impl_t * 140fa9e4066Sahrens dbuf_hash_insert(dmu_buf_impl_t *db) 141fa9e4066Sahrens { 142fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 143503ad85cSMatthew Ahrens objset_t *os = db->db_objset; 144fa9e4066Sahrens uint64_t obj = db->db.db_object; 145fa9e4066Sahrens int level = db->db_level; 146fa9e4066Sahrens uint64_t blkid = db->db_blkid; 147fa9e4066Sahrens uint64_t hv = DBUF_HASH(os, obj, level, blkid); 148fa9e4066Sahrens uint64_t idx = hv & h->hash_table_mask; 149fa9e4066Sahrens dmu_buf_impl_t *dbf; 150fa9e4066Sahrens 151fa9e4066Sahrens mutex_enter(DBUF_HASH_MUTEX(h, idx)); 152fa9e4066Sahrens for (dbf = h->hash_table[idx]; dbf != NULL; dbf = dbf->db_hash_next) { 153fa9e4066Sahrens if (DBUF_EQUAL(dbf, os, obj, level, blkid)) { 154fa9e4066Sahrens mutex_enter(&dbf->db_mtx); 155ea8dc4b6Seschrock if (dbf->db_state != DB_EVICTING) { 156fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 157fa9e4066Sahrens return (dbf); 158fa9e4066Sahrens } 159fa9e4066Sahrens mutex_exit(&dbf->db_mtx); 160fa9e4066Sahrens } 161fa9e4066Sahrens } 162fa9e4066Sahrens 163fa9e4066Sahrens mutex_enter(&db->db_mtx); 164fa9e4066Sahrens db->db_hash_next = h->hash_table[idx]; 165fa9e4066Sahrens h->hash_table[idx] = db; 166fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 167fa9e4066Sahrens atomic_add_64(&dbuf_hash_count, 1); 168fa9e4066Sahrens 169fa9e4066Sahrens return (NULL); 170fa9e4066Sahrens } 171fa9e4066Sahrens 172fa9e4066Sahrens /* 173fa9e4066Sahrens * Remove an entry from the hash table. This operation will 174fa9e4066Sahrens * fail if there are any existing holds on the db. 175fa9e4066Sahrens */ 176fa9e4066Sahrens static void 177fa9e4066Sahrens dbuf_hash_remove(dmu_buf_impl_t *db) 178fa9e4066Sahrens { 179fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 180fa9e4066Sahrens uint64_t hv = DBUF_HASH(db->db_objset, db->db.db_object, 181fa9e4066Sahrens db->db_level, db->db_blkid); 182fa9e4066Sahrens uint64_t idx = hv & h->hash_table_mask; 183fa9e4066Sahrens dmu_buf_impl_t *dbf, **dbp; 184fa9e4066Sahrens 185fa9e4066Sahrens /* 186fa9e4066Sahrens * We musn't hold db_mtx to maintin lock ordering: 187fa9e4066Sahrens * DBUF_HASH_MUTEX > db_mtx. 188fa9e4066Sahrens */ 189fa9e4066Sahrens ASSERT(refcount_is_zero(&db->db_holds)); 190ea8dc4b6Seschrock ASSERT(db->db_state == DB_EVICTING); 191fa9e4066Sahrens ASSERT(!MUTEX_HELD(&db->db_mtx)); 192fa9e4066Sahrens 193fa9e4066Sahrens mutex_enter(DBUF_HASH_MUTEX(h, idx)); 194fa9e4066Sahrens dbp = &h->hash_table[idx]; 195fa9e4066Sahrens while ((dbf = *dbp) != db) { 196fa9e4066Sahrens dbp = &dbf->db_hash_next; 197fa9e4066Sahrens ASSERT(dbf != NULL); 198fa9e4066Sahrens } 199fa9e4066Sahrens *dbp = db->db_hash_next; 200fa9e4066Sahrens db->db_hash_next = NULL; 201fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 202fa9e4066Sahrens atomic_add_64(&dbuf_hash_count, -1); 203fa9e4066Sahrens } 204fa9e4066Sahrens 205ea8dc4b6Seschrock static arc_evict_func_t dbuf_do_evict; 206fa9e4066Sahrens 207fa9e4066Sahrens static void 208fa9e4066Sahrens dbuf_evict_user(dmu_buf_impl_t *db) 209fa9e4066Sahrens { 210fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 211fa9e4066Sahrens 212c717a561Smaybee if (db->db_level != 0 || db->db_evict_func == NULL) 213fa9e4066Sahrens return; 214fa9e4066Sahrens 215c717a561Smaybee if (db->db_user_data_ptr_ptr) 216c717a561Smaybee *db->db_user_data_ptr_ptr = db->db.db_data; 217c717a561Smaybee db->db_evict_func(&db->db, db->db_user_ptr); 218c717a561Smaybee db->db_user_ptr = NULL; 219c717a561Smaybee db->db_user_data_ptr_ptr = NULL; 220c717a561Smaybee db->db_evict_func = NULL; 221fa9e4066Sahrens } 222fa9e4066Sahrens 223744947dcSTom Erickson boolean_t 224744947dcSTom Erickson dbuf_is_metadata(dmu_buf_impl_t *db) 225744947dcSTom Erickson { 226744947dcSTom Erickson if (db->db_level > 0) { 227744947dcSTom Erickson return (B_TRUE); 228744947dcSTom Erickson } else { 229744947dcSTom Erickson boolean_t is_metadata; 230744947dcSTom Erickson 231744947dcSTom Erickson DB_DNODE_ENTER(db); 232ad135b5dSChristopher Siden is_metadata = DMU_OT_IS_METADATA(DB_DNODE(db)->dn_type); 233744947dcSTom Erickson DB_DNODE_EXIT(db); 234744947dcSTom Erickson 235744947dcSTom Erickson return (is_metadata); 236744947dcSTom Erickson } 237744947dcSTom Erickson } 238744947dcSTom Erickson 239ea8dc4b6Seschrock void 240ea8dc4b6Seschrock dbuf_evict(dmu_buf_impl_t *db) 241ea8dc4b6Seschrock { 242ea8dc4b6Seschrock ASSERT(MUTEX_HELD(&db->db_mtx)); 243ea8dc4b6Seschrock ASSERT(db->db_buf == NULL); 244c717a561Smaybee ASSERT(db->db_data_pending == NULL); 245ea8dc4b6Seschrock 246ea8dc4b6Seschrock dbuf_clear(db); 247ea8dc4b6Seschrock dbuf_destroy(db); 248ea8dc4b6Seschrock } 249ea8dc4b6Seschrock 250fa9e4066Sahrens void 251fa9e4066Sahrens dbuf_init(void) 252fa9e4066Sahrens { 253ea8dc4b6Seschrock uint64_t hsize = 1ULL << 16; 254fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 255fa9e4066Sahrens int i; 256fa9e4066Sahrens 257fa9e4066Sahrens /* 258fa9e4066Sahrens * The hash table is big enough to fill all of physical memory 259ea8dc4b6Seschrock * with an average 4K block size. The table will take up 260ea8dc4b6Seschrock * totalmem*sizeof(void*)/4K (i.e. 2MB/GB with 8-byte pointers). 261fa9e4066Sahrens */ 262ea8dc4b6Seschrock while (hsize * 4096 < physmem * PAGESIZE) 263fa9e4066Sahrens hsize <<= 1; 264fa9e4066Sahrens 265ea8dc4b6Seschrock retry: 266fa9e4066Sahrens h->hash_table_mask = hsize - 1; 267ea8dc4b6Seschrock h->hash_table = kmem_zalloc(hsize * sizeof (void *), KM_NOSLEEP); 268ea8dc4b6Seschrock if (h->hash_table == NULL) { 269ea8dc4b6Seschrock /* XXX - we should really return an error instead of assert */ 270ea8dc4b6Seschrock ASSERT(hsize > (1ULL << 10)); 271ea8dc4b6Seschrock hsize >>= 1; 272ea8dc4b6Seschrock goto retry; 273ea8dc4b6Seschrock } 274fa9e4066Sahrens 275fa9e4066Sahrens dbuf_cache = kmem_cache_create("dmu_buf_impl_t", 276fa9e4066Sahrens sizeof (dmu_buf_impl_t), 277fa9e4066Sahrens 0, dbuf_cons, dbuf_dest, NULL, NULL, NULL, 0); 278fa9e4066Sahrens 279fa9e4066Sahrens for (i = 0; i < DBUF_MUTEXES; i++) 280fa9e4066Sahrens mutex_init(&h->hash_mutexes[i], NULL, MUTEX_DEFAULT, NULL); 281fa9e4066Sahrens } 282fa9e4066Sahrens 283fa9e4066Sahrens void 284fa9e4066Sahrens dbuf_fini(void) 285fa9e4066Sahrens { 286fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 287fa9e4066Sahrens int i; 288fa9e4066Sahrens 289fa9e4066Sahrens for (i = 0; i < DBUF_MUTEXES; i++) 290fa9e4066Sahrens mutex_destroy(&h->hash_mutexes[i]); 291fa9e4066Sahrens kmem_free(h->hash_table, (h->hash_table_mask + 1) * sizeof (void *)); 292fa9e4066Sahrens kmem_cache_destroy(dbuf_cache); 293fa9e4066Sahrens } 294fa9e4066Sahrens 295fa9e4066Sahrens /* 296fa9e4066Sahrens * Other stuff. 297fa9e4066Sahrens */ 298fa9e4066Sahrens 2999c9dc39aSek #ifdef ZFS_DEBUG 300fa9e4066Sahrens static void 301fa9e4066Sahrens dbuf_verify(dmu_buf_impl_t *db) 302fa9e4066Sahrens { 303744947dcSTom Erickson dnode_t *dn; 304b24ab676SJeff Bonwick dbuf_dirty_record_t *dr; 305fa9e4066Sahrens 306fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 307fa9e4066Sahrens 308fa9e4066Sahrens if (!(zfs_flags & ZFS_DEBUG_DBUF_VERIFY)) 309fa9e4066Sahrens return; 310fa9e4066Sahrens 311fa9e4066Sahrens ASSERT(db->db_objset != NULL); 312744947dcSTom Erickson DB_DNODE_ENTER(db); 313744947dcSTom Erickson dn = DB_DNODE(db); 314fa9e4066Sahrens if (dn == NULL) { 315fa9e4066Sahrens ASSERT(db->db_parent == NULL); 316fa9e4066Sahrens ASSERT(db->db_blkptr == NULL); 317fa9e4066Sahrens } else { 318fa9e4066Sahrens ASSERT3U(db->db.db_object, ==, dn->dn_object); 319fa9e4066Sahrens ASSERT3P(db->db_objset, ==, dn->dn_objset); 320fa9e4066Sahrens ASSERT3U(db->db_level, <, dn->dn_nlevels); 321744947dcSTom Erickson ASSERT(db->db_blkid == DMU_BONUS_BLKID || 322744947dcSTom Erickson db->db_blkid == DMU_SPILL_BLKID || 323744947dcSTom Erickson !list_is_empty(&dn->dn_dbufs)); 324fa9e4066Sahrens } 3250a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 326fa9e4066Sahrens ASSERT(dn != NULL); 3271934e92fSmaybee ASSERT3U(db->db.db_size, >=, dn->dn_bonuslen); 3280a586ceaSMark Shellenbaum ASSERT3U(db->db.db_offset, ==, DMU_BONUS_BLKID); 3290a586ceaSMark Shellenbaum } else if (db->db_blkid == DMU_SPILL_BLKID) { 3300a586ceaSMark Shellenbaum ASSERT(dn != NULL); 3310a586ceaSMark Shellenbaum ASSERT3U(db->db.db_size, >=, dn->dn_bonuslen); 332fb09f5aaSMadhav Suresh ASSERT0(db->db.db_offset); 333fa9e4066Sahrens } else { 334fa9e4066Sahrens ASSERT3U(db->db.db_offset, ==, db->db_blkid * db->db.db_size); 335fa9e4066Sahrens } 336fa9e4066Sahrens 337b24ab676SJeff Bonwick for (dr = db->db_data_pending; dr != NULL; dr = dr->dr_next) 338b24ab676SJeff Bonwick ASSERT(dr->dr_dbuf == db); 339b24ab676SJeff Bonwick 340b24ab676SJeff Bonwick for (dr = db->db_last_dirty; dr != NULL; dr = dr->dr_next) 341b24ab676SJeff Bonwick ASSERT(dr->dr_dbuf == db); 342b24ab676SJeff Bonwick 34388b7b0f2SMatthew Ahrens /* 34488b7b0f2SMatthew Ahrens * We can't assert that db_size matches dn_datablksz because it 34588b7b0f2SMatthew Ahrens * can be momentarily different when another thread is doing 34688b7b0f2SMatthew Ahrens * dnode_set_blksz(). 34788b7b0f2SMatthew Ahrens */ 34888b7b0f2SMatthew Ahrens if (db->db_level == 0 && db->db.db_object == DMU_META_DNODE_OBJECT) { 349b24ab676SJeff Bonwick dr = db->db_data_pending; 35088b7b0f2SMatthew Ahrens /* 35188b7b0f2SMatthew Ahrens * It should only be modified in syncing context, so 35288b7b0f2SMatthew Ahrens * make sure we only have one copy of the data. 35388b7b0f2SMatthew Ahrens */ 35488b7b0f2SMatthew Ahrens ASSERT(dr == NULL || dr->dt.dl.dr_data == db->db_buf); 355fa9e4066Sahrens } 356fa9e4066Sahrens 357fa9e4066Sahrens /* verify db->db_blkptr */ 358fa9e4066Sahrens if (db->db_blkptr) { 359fa9e4066Sahrens if (db->db_parent == dn->dn_dbuf) { 360fa9e4066Sahrens /* db is pointed to by the dnode */ 361fa9e4066Sahrens /* ASSERT3U(db->db_blkid, <, dn->dn_nblkptr); */ 36214843421SMatthew Ahrens if (DMU_OBJECT_IS_SPECIAL(db->db.db_object)) 363fa9e4066Sahrens ASSERT(db->db_parent == NULL); 364fa9e4066Sahrens else 365fa9e4066Sahrens ASSERT(db->db_parent != NULL); 3660a586ceaSMark Shellenbaum if (db->db_blkid != DMU_SPILL_BLKID) 3670a586ceaSMark Shellenbaum ASSERT3P(db->db_blkptr, ==, 3680a586ceaSMark Shellenbaum &dn->dn_phys->dn_blkptr[db->db_blkid]); 369fa9e4066Sahrens } else { 370fa9e4066Sahrens /* db is pointed to by an indirect block */ 371fa9e4066Sahrens int epb = db->db_parent->db.db_size >> SPA_BLKPTRSHIFT; 372fa9e4066Sahrens ASSERT3U(db->db_parent->db_level, ==, db->db_level+1); 373fa9e4066Sahrens ASSERT3U(db->db_parent->db.db_object, ==, 374fa9e4066Sahrens db->db.db_object); 375fa9e4066Sahrens /* 376fa9e4066Sahrens * dnode_grow_indblksz() can make this fail if we don't 377fa9e4066Sahrens * have the struct_rwlock. XXX indblksz no longer 378fa9e4066Sahrens * grows. safe to do this now? 379fa9e4066Sahrens */ 380744947dcSTom Erickson if (RW_WRITE_HELD(&dn->dn_struct_rwlock)) { 381fa9e4066Sahrens ASSERT3P(db->db_blkptr, ==, 382fa9e4066Sahrens ((blkptr_t *)db->db_parent->db.db_data + 383fa9e4066Sahrens db->db_blkid % epb)); 384fa9e4066Sahrens } 385fa9e4066Sahrens } 386fa9e4066Sahrens } 387fa9e4066Sahrens if ((db->db_blkptr == NULL || BP_IS_HOLE(db->db_blkptr)) && 3883f9d6ad7SLin Ling (db->db_buf == NULL || db->db_buf->b_data) && 3890a586ceaSMark Shellenbaum db->db.db_data && db->db_blkid != DMU_BONUS_BLKID && 390fa9e4066Sahrens db->db_state != DB_FILL && !dn->dn_free_txg) { 391fa9e4066Sahrens /* 392fa9e4066Sahrens * If the blkptr isn't set but they have nonzero data, 393fa9e4066Sahrens * it had better be dirty, otherwise we'll lose that 394fa9e4066Sahrens * data when we evict this buffer. 395fa9e4066Sahrens */ 396fa9e4066Sahrens if (db->db_dirtycnt == 0) { 397fa9e4066Sahrens uint64_t *buf = db->db.db_data; 398fa9e4066Sahrens int i; 399fa9e4066Sahrens 400fa9e4066Sahrens for (i = 0; i < db->db.db_size >> 3; i++) { 401fa9e4066Sahrens ASSERT(buf[i] == 0); 402fa9e4066Sahrens } 403fa9e4066Sahrens } 404fa9e4066Sahrens } 405744947dcSTom Erickson DB_DNODE_EXIT(db); 406fa9e4066Sahrens } 4079c9dc39aSek #endif 408fa9e4066Sahrens 409fa9e4066Sahrens static void 410fa9e4066Sahrens dbuf_update_data(dmu_buf_impl_t *db) 411fa9e4066Sahrens { 412fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 413c717a561Smaybee if (db->db_level == 0 && db->db_user_data_ptr_ptr) { 414fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 415c717a561Smaybee *db->db_user_data_ptr_ptr = db->db.db_data; 416fa9e4066Sahrens } 417fa9e4066Sahrens } 418fa9e4066Sahrens 419fa9e4066Sahrens static void 420fa9e4066Sahrens dbuf_set_data(dmu_buf_impl_t *db, arc_buf_t *buf) 421fa9e4066Sahrens { 422fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 423ea8dc4b6Seschrock ASSERT(db->db_buf == NULL || !arc_has_callback(db->db_buf)); 424fa9e4066Sahrens db->db_buf = buf; 425ea8dc4b6Seschrock if (buf != NULL) { 426ea8dc4b6Seschrock ASSERT(buf->b_data != NULL); 427ea8dc4b6Seschrock db->db.db_data = buf->b_data; 428ea8dc4b6Seschrock if (!arc_released(buf)) 429ea8dc4b6Seschrock arc_set_callback(buf, dbuf_do_evict, db); 430ea8dc4b6Seschrock dbuf_update_data(db); 431ea8dc4b6Seschrock } else { 432ea8dc4b6Seschrock dbuf_evict_user(db); 433ea8dc4b6Seschrock db->db.db_data = NULL; 43482c9918fSTim Haley if (db->db_state != DB_NOFILL) 43582c9918fSTim Haley db->db_state = DB_UNCACHED; 436ea8dc4b6Seschrock } 437fa9e4066Sahrens } 438fa9e4066Sahrens 439c242f9a0Schunli zhang - Sun Microsystems - Irvine United States /* 440c242f9a0Schunli zhang - Sun Microsystems - Irvine United States * Loan out an arc_buf for read. Return the loaned arc_buf. 441c242f9a0Schunli zhang - Sun Microsystems - Irvine United States */ 442c242f9a0Schunli zhang - Sun Microsystems - Irvine United States arc_buf_t * 443c242f9a0Schunli zhang - Sun Microsystems - Irvine United States dbuf_loan_arcbuf(dmu_buf_impl_t *db) 444c242f9a0Schunli zhang - Sun Microsystems - Irvine United States { 445c242f9a0Schunli zhang - Sun Microsystems - Irvine United States arc_buf_t *abuf; 446c242f9a0Schunli zhang - Sun Microsystems - Irvine United States 447c242f9a0Schunli zhang - Sun Microsystems - Irvine United States mutex_enter(&db->db_mtx); 448c242f9a0Schunli zhang - Sun Microsystems - Irvine United States if (arc_released(db->db_buf) || refcount_count(&db->db_holds) > 1) { 449c242f9a0Schunli zhang - Sun Microsystems - Irvine United States int blksz = db->db.db_size; 450744947dcSTom Erickson spa_t *spa; 451744947dcSTom Erickson 452c242f9a0Schunli zhang - Sun Microsystems - Irvine United States mutex_exit(&db->db_mtx); 453744947dcSTom Erickson DB_GET_SPA(&spa, db); 454744947dcSTom Erickson abuf = arc_loan_buf(spa, blksz); 455c242f9a0Schunli zhang - Sun Microsystems - Irvine United States bcopy(db->db.db_data, abuf->b_data, blksz); 456c242f9a0Schunli zhang - Sun Microsystems - Irvine United States } else { 457c242f9a0Schunli zhang - Sun Microsystems - Irvine United States abuf = db->db_buf; 458c242f9a0Schunli zhang - Sun Microsystems - Irvine United States arc_loan_inuse_buf(abuf, db); 459c242f9a0Schunli zhang - Sun Microsystems - Irvine United States dbuf_set_data(db, NULL); 460c242f9a0Schunli zhang - Sun Microsystems - Irvine United States mutex_exit(&db->db_mtx); 461c242f9a0Schunli zhang - Sun Microsystems - Irvine United States } 462c242f9a0Schunli zhang - Sun Microsystems - Irvine United States return (abuf); 463c242f9a0Schunli zhang - Sun Microsystems - Irvine United States } 464c242f9a0Schunli zhang - Sun Microsystems - Irvine United States 465fa9e4066Sahrens uint64_t 466fa9e4066Sahrens dbuf_whichblock(dnode_t *dn, uint64_t offset) 467fa9e4066Sahrens { 468fa9e4066Sahrens if (dn->dn_datablkshift) { 469fa9e4066Sahrens return (offset >> dn->dn_datablkshift); 470fa9e4066Sahrens } else { 471fa9e4066Sahrens ASSERT3U(offset, <, dn->dn_datablksz); 472fa9e4066Sahrens return (0); 473fa9e4066Sahrens } 474fa9e4066Sahrens } 475fa9e4066Sahrens 476fa9e4066Sahrens static void 477fa9e4066Sahrens dbuf_read_done(zio_t *zio, arc_buf_t *buf, void *vdb) 478fa9e4066Sahrens { 479fa9e4066Sahrens dmu_buf_impl_t *db = vdb; 480fa9e4066Sahrens 481fa9e4066Sahrens mutex_enter(&db->db_mtx); 482fa9e4066Sahrens ASSERT3U(db->db_state, ==, DB_READ); 483fa9e4066Sahrens /* 484fa9e4066Sahrens * All reads are synchronous, so we must have a hold on the dbuf 485fa9e4066Sahrens */ 486fa9e4066Sahrens ASSERT(refcount_count(&db->db_holds) > 0); 487ea8dc4b6Seschrock ASSERT(db->db_buf == NULL); 488fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 489c717a561Smaybee if (db->db_level == 0 && db->db_freed_in_flight) { 490fa9e4066Sahrens /* we were freed in flight; disregard any error */ 491fa9e4066Sahrens arc_release(buf, db); 492fa9e4066Sahrens bzero(buf->b_data, db->db.db_size); 4936b4acc8bSahrens arc_buf_freeze(buf); 494c717a561Smaybee db->db_freed_in_flight = FALSE; 495fa9e4066Sahrens dbuf_set_data(db, buf); 496fa9e4066Sahrens db->db_state = DB_CACHED; 497fa9e4066Sahrens } else if (zio == NULL || zio->io_error == 0) { 498fa9e4066Sahrens dbuf_set_data(db, buf); 499fa9e4066Sahrens db->db_state = DB_CACHED; 500fa9e4066Sahrens } else { 5010a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 502fa9e4066Sahrens ASSERT3P(db->db_buf, ==, NULL); 5033b2aab18SMatthew Ahrens VERIFY(arc_buf_remove_ref(buf, db)); 504ea8dc4b6Seschrock db->db_state = DB_UNCACHED; 505fa9e4066Sahrens } 506fa9e4066Sahrens cv_broadcast(&db->db_changed); 5073f9d6ad7SLin Ling dbuf_rele_and_unlock(db, NULL); 508fa9e4066Sahrens } 509fa9e4066Sahrens 510ea8dc4b6Seschrock static void 51113506d1eSmaybee dbuf_read_impl(dmu_buf_impl_t *db, zio_t *zio, uint32_t *flags) 512fa9e4066Sahrens { 513744947dcSTom Erickson dnode_t *dn; 514744947dcSTom Erickson spa_t *spa; 515ea8dc4b6Seschrock zbookmark_t zb; 51613506d1eSmaybee uint32_t aflags = ARC_NOWAIT; 517fa9e4066Sahrens 518744947dcSTom Erickson DB_DNODE_ENTER(db); 519744947dcSTom Erickson dn = DB_DNODE(db); 520fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 521fa9e4066Sahrens /* We need the struct_rwlock to prevent db_blkptr from changing. */ 522088f3894Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 523ea8dc4b6Seschrock ASSERT(MUTEX_HELD(&db->db_mtx)); 524ea8dc4b6Seschrock ASSERT(db->db_state == DB_UNCACHED); 525ea8dc4b6Seschrock ASSERT(db->db_buf == NULL); 526fa9e4066Sahrens 5270a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 528cf04dda1SMark Maybee int bonuslen = MIN(dn->dn_bonuslen, dn->dn_phys->dn_bonuslen); 5291934e92fSmaybee 5301934e92fSmaybee ASSERT3U(bonuslen, <=, db->db.db_size); 531ea8dc4b6Seschrock db->db.db_data = zio_buf_alloc(DN_MAX_BONUSLEN); 5325a98e54bSBrendan Gregg - Sun Microsystems arc_space_consume(DN_MAX_BONUSLEN, ARC_SPACE_OTHER); 5331934e92fSmaybee if (bonuslen < DN_MAX_BONUSLEN) 534ea8dc4b6Seschrock bzero(db->db.db_data, DN_MAX_BONUSLEN); 535cf04dda1SMark Maybee if (bonuslen) 536cf04dda1SMark Maybee bcopy(DN_BONUS(dn->dn_phys), db->db.db_data, bonuslen); 537744947dcSTom Erickson DB_DNODE_EXIT(db); 538ea8dc4b6Seschrock dbuf_update_data(db); 539fa9e4066Sahrens db->db_state = DB_CACHED; 540fa9e4066Sahrens mutex_exit(&db->db_mtx); 541fa9e4066Sahrens return; 542fa9e4066Sahrens } 543fa9e4066Sahrens 5441c8564a7SMark Maybee /* 5451c8564a7SMark Maybee * Recheck BP_IS_HOLE() after dnode_block_freed() in case dnode_sync() 5461c8564a7SMark Maybee * processes the delete record and clears the bp while we are waiting 5471c8564a7SMark Maybee * for the dn_mtx (resulting in a "no" from block_freed). 5481c8564a7SMark Maybee */ 549088f3894Sahrens if (db->db_blkptr == NULL || BP_IS_HOLE(db->db_blkptr) || 5501c8564a7SMark Maybee (db->db_level == 0 && (dnode_block_freed(dn, db->db_blkid) || 5511c8564a7SMark Maybee BP_IS_HOLE(db->db_blkptr)))) { 552ad23a2dbSjohansen arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 553ad23a2dbSjohansen 554088f3894Sahrens dbuf_set_data(db, arc_buf_alloc(dn->dn_objset->os_spa, 555ad23a2dbSjohansen db->db.db_size, db, type)); 556744947dcSTom Erickson DB_DNODE_EXIT(db); 557fa9e4066Sahrens bzero(db->db.db_data, db->db.db_size); 558fa9e4066Sahrens db->db_state = DB_CACHED; 55913506d1eSmaybee *flags |= DB_RF_CACHED; 560fa9e4066Sahrens mutex_exit(&db->db_mtx); 561fa9e4066Sahrens return; 562fa9e4066Sahrens } 563fa9e4066Sahrens 564744947dcSTom Erickson spa = dn->dn_objset->os_spa; 565744947dcSTom Erickson DB_DNODE_EXIT(db); 566744947dcSTom Erickson 567fa9e4066Sahrens db->db_state = DB_READ; 568fa9e4066Sahrens mutex_exit(&db->db_mtx); 569fa9e4066Sahrens 5703baa08fcSek if (DBUF_IS_L2CACHEABLE(db)) 5713baa08fcSek aflags |= ARC_L2CACHE; 572aad02571SSaso Kiselkov if (DBUF_IS_L2COMPRESSIBLE(db)) 573aad02571SSaso Kiselkov aflags |= ARC_L2COMPRESS; 5743baa08fcSek 575b24ab676SJeff Bonwick SET_BOOKMARK(&zb, db->db_objset->os_dsl_dataset ? 576b24ab676SJeff Bonwick db->db_objset->os_dsl_dataset->ds_object : DMU_META_OBJSET, 577b24ab676SJeff Bonwick db->db.db_object, db->db_level, db->db_blkid); 578ea8dc4b6Seschrock 579ea8dc4b6Seschrock dbuf_add_ref(db, NULL); 580088f3894Sahrens 5811b912ec7SGeorge Wilson (void) arc_read(zio, spa, db->db_blkptr, 582fa9e4066Sahrens dbuf_read_done, db, ZIO_PRIORITY_SYNC_READ, 58313506d1eSmaybee (*flags & DB_RF_CANFAIL) ? ZIO_FLAG_CANFAIL : ZIO_FLAG_MUSTSUCCEED, 58413506d1eSmaybee &aflags, &zb); 58513506d1eSmaybee if (aflags & ARC_CACHED) 58613506d1eSmaybee *flags |= DB_RF_CACHED; 587fa9e4066Sahrens } 588fa9e4066Sahrens 589ea8dc4b6Seschrock int 590ea8dc4b6Seschrock dbuf_read(dmu_buf_impl_t *db, zio_t *zio, uint32_t flags) 591fa9e4066Sahrens { 592ea8dc4b6Seschrock int err = 0; 593ea8dc4b6Seschrock int havepzio = (zio != NULL); 59413506d1eSmaybee int prefetch; 595744947dcSTom Erickson dnode_t *dn; 596fa9e4066Sahrens 597fa9e4066Sahrens /* 598fa9e4066Sahrens * We don't have to hold the mutex to check db_state because it 599fa9e4066Sahrens * can't be freed while we have a hold on the buffer. 600fa9e4066Sahrens */ 601fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 602fa9e4066Sahrens 60382c9918fSTim Haley if (db->db_state == DB_NOFILL) 604be6fd75aSMatthew Ahrens return (SET_ERROR(EIO)); 60582c9918fSTim Haley 606744947dcSTom Erickson DB_DNODE_ENTER(db); 607744947dcSTom Erickson dn = DB_DNODE(db); 608ea8dc4b6Seschrock if ((flags & DB_RF_HAVESTRUCT) == 0) 609744947dcSTom Erickson rw_enter(&dn->dn_struct_rwlock, RW_READER); 610ea8dc4b6Seschrock 6110a586ceaSMark Shellenbaum prefetch = db->db_level == 0 && db->db_blkid != DMU_BONUS_BLKID && 612744947dcSTom Erickson (flags & DB_RF_NOPREFETCH) == 0 && dn != NULL && 6133baa08fcSek DBUF_IS_CACHEABLE(db); 61413506d1eSmaybee 615ea8dc4b6Seschrock mutex_enter(&db->db_mtx); 616ea8dc4b6Seschrock if (db->db_state == DB_CACHED) { 617ea8dc4b6Seschrock mutex_exit(&db->db_mtx); 61813506d1eSmaybee if (prefetch) 619744947dcSTom Erickson dmu_zfetch(&dn->dn_zfetch, db->db.db_offset, 62013506d1eSmaybee db->db.db_size, TRUE); 621fa9e4066Sahrens if ((flags & DB_RF_HAVESTRUCT) == 0) 622744947dcSTom Erickson rw_exit(&dn->dn_struct_rwlock); 623744947dcSTom Erickson DB_DNODE_EXIT(db); 624ea8dc4b6Seschrock } else if (db->db_state == DB_UNCACHED) { 625744947dcSTom Erickson spa_t *spa = dn->dn_objset->os_spa; 626744947dcSTom Erickson 627744947dcSTom Erickson if (zio == NULL) 628744947dcSTom Erickson zio = zio_root(spa, NULL, NULL, ZIO_FLAG_CANFAIL); 62913506d1eSmaybee dbuf_read_impl(db, zio, &flags); 63013506d1eSmaybee 631ea8dc4b6Seschrock /* dbuf_read_impl has dropped db_mtx for us */ 632ea8dc4b6Seschrock 63313506d1eSmaybee if (prefetch) 634744947dcSTom Erickson dmu_zfetch(&dn->dn_zfetch, db->db.db_offset, 63513506d1eSmaybee db->db.db_size, flags & DB_RF_CACHED); 636ea8dc4b6Seschrock 637fa9e4066Sahrens if ((flags & DB_RF_HAVESTRUCT) == 0) 638744947dcSTom Erickson rw_exit(&dn->dn_struct_rwlock); 639744947dcSTom Erickson DB_DNODE_EXIT(db); 640fa9e4066Sahrens 641ea8dc4b6Seschrock if (!havepzio) 642ea8dc4b6Seschrock err = zio_wait(zio); 643ea8dc4b6Seschrock } else { 644*3e30c24aSWill Andrews /* 645*3e30c24aSWill Andrews * Another reader came in while the dbuf was in flight 646*3e30c24aSWill Andrews * between UNCACHED and CACHED. Either a writer will finish 647*3e30c24aSWill Andrews * writing the buffer (sending the dbuf to CACHED) or the 648*3e30c24aSWill Andrews * first reader's request will reach the read_done callback 649*3e30c24aSWill Andrews * and send the dbuf to CACHED. Otherwise, a failure 650*3e30c24aSWill Andrews * occurred and the dbuf went to UNCACHED. 651*3e30c24aSWill Andrews */ 65213506d1eSmaybee mutex_exit(&db->db_mtx); 65313506d1eSmaybee if (prefetch) 654744947dcSTom Erickson dmu_zfetch(&dn->dn_zfetch, db->db.db_offset, 65513506d1eSmaybee db->db.db_size, TRUE); 656ea8dc4b6Seschrock if ((flags & DB_RF_HAVESTRUCT) == 0) 657744947dcSTom Erickson rw_exit(&dn->dn_struct_rwlock); 658744947dcSTom Erickson DB_DNODE_EXIT(db); 65913506d1eSmaybee 660*3e30c24aSWill Andrews /* Skip the wait per the caller's request. */ 66113506d1eSmaybee mutex_enter(&db->db_mtx); 662ea8dc4b6Seschrock if ((flags & DB_RF_NEVERWAIT) == 0) { 663ea8dc4b6Seschrock while (db->db_state == DB_READ || 664ea8dc4b6Seschrock db->db_state == DB_FILL) { 665ea8dc4b6Seschrock ASSERT(db->db_state == DB_READ || 666ea8dc4b6Seschrock (flags & DB_RF_HAVESTRUCT) == 0); 667ea8dc4b6Seschrock cv_wait(&db->db_changed, &db->db_mtx); 668ea8dc4b6Seschrock } 669ea8dc4b6Seschrock if (db->db_state == DB_UNCACHED) 670be6fd75aSMatthew Ahrens err = SET_ERROR(EIO); 671ea8dc4b6Seschrock } 672ea8dc4b6Seschrock mutex_exit(&db->db_mtx); 673fa9e4066Sahrens } 674fa9e4066Sahrens 675ea8dc4b6Seschrock ASSERT(err || havepzio || db->db_state == DB_CACHED); 676ea8dc4b6Seschrock return (err); 677fa9e4066Sahrens } 678fa9e4066Sahrens 679fa9e4066Sahrens static void 680fa9e4066Sahrens dbuf_noread(dmu_buf_impl_t *db) 681fa9e4066Sahrens { 682fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 6830a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 684fa9e4066Sahrens mutex_enter(&db->db_mtx); 685fa9e4066Sahrens while (db->db_state == DB_READ || db->db_state == DB_FILL) 686fa9e4066Sahrens cv_wait(&db->db_changed, &db->db_mtx); 687fa9e4066Sahrens if (db->db_state == DB_UNCACHED) { 688ad23a2dbSjohansen arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 689744947dcSTom Erickson spa_t *spa; 690ad23a2dbSjohansen 691ea8dc4b6Seschrock ASSERT(db->db_buf == NULL); 692fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 693744947dcSTom Erickson DB_GET_SPA(&spa, db); 694744947dcSTom Erickson dbuf_set_data(db, arc_buf_alloc(spa, db->db.db_size, db, type)); 695fa9e4066Sahrens db->db_state = DB_FILL; 69682c9918fSTim Haley } else if (db->db_state == DB_NOFILL) { 69782c9918fSTim Haley dbuf_set_data(db, NULL); 698fa9e4066Sahrens } else { 699fa9e4066Sahrens ASSERT3U(db->db_state, ==, DB_CACHED); 700fa9e4066Sahrens } 701fa9e4066Sahrens mutex_exit(&db->db_mtx); 702fa9e4066Sahrens } 703fa9e4066Sahrens 704fa9e4066Sahrens /* 705fa9e4066Sahrens * This is our just-in-time copy function. It makes a copy of 706fa9e4066Sahrens * buffers, that have been modified in a previous transaction 707fa9e4066Sahrens * group, before we modify them in the current active group. 708fa9e4066Sahrens * 709fa9e4066Sahrens * This function is used in two places: when we are dirtying a 710fa9e4066Sahrens * buffer for the first time in a txg, and when we are freeing 711fa9e4066Sahrens * a range in a dnode that includes this buffer. 712fa9e4066Sahrens * 713fa9e4066Sahrens * Note that when we are called from dbuf_free_range() we do 714fa9e4066Sahrens * not put a hold on the buffer, we just traverse the active 715fa9e4066Sahrens * dbuf list for the dnode. 716fa9e4066Sahrens */ 717fa9e4066Sahrens static void 718fa9e4066Sahrens dbuf_fix_old_data(dmu_buf_impl_t *db, uint64_t txg) 719fa9e4066Sahrens { 720c717a561Smaybee dbuf_dirty_record_t *dr = db->db_last_dirty; 721fa9e4066Sahrens 722fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 723fa9e4066Sahrens ASSERT(db->db.db_data != NULL); 724c717a561Smaybee ASSERT(db->db_level == 0); 725c717a561Smaybee ASSERT(db->db.db_object != DMU_META_DNODE_OBJECT); 726fa9e4066Sahrens 7274d31c452Smaybee if (dr == NULL || 7284d31c452Smaybee (dr->dt.dl.dr_data != 7290a586ceaSMark Shellenbaum ((db->db_blkid == DMU_BONUS_BLKID) ? db->db.db_data : db->db_buf))) 730fa9e4066Sahrens return; 731fa9e4066Sahrens 732fa9e4066Sahrens /* 733c717a561Smaybee * If the last dirty record for this dbuf has not yet synced 734c717a561Smaybee * and its referencing the dbuf data, either: 735744947dcSTom Erickson * reset the reference to point to a new copy, 736c717a561Smaybee * or (if there a no active holders) 737c717a561Smaybee * just null out the current db_data pointer. 738fa9e4066Sahrens */ 739c717a561Smaybee ASSERT(dr->dr_txg >= txg - 2); 7400a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 741c717a561Smaybee /* Note that the data bufs here are zio_bufs */ 742c717a561Smaybee dr->dt.dl.dr_data = zio_buf_alloc(DN_MAX_BONUSLEN); 7435a98e54bSBrendan Gregg - Sun Microsystems arc_space_consume(DN_MAX_BONUSLEN, ARC_SPACE_OTHER); 744c717a561Smaybee bcopy(db->db.db_data, dr->dt.dl.dr_data, DN_MAX_BONUSLEN); 745c717a561Smaybee } else if (refcount_count(&db->db_holds) > db->db_dirtycnt) { 746c717a561Smaybee int size = db->db.db_size; 747c717a561Smaybee arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 748744947dcSTom Erickson spa_t *spa; 749744947dcSTom Erickson 750744947dcSTom Erickson DB_GET_SPA(&spa, db); 751744947dcSTom Erickson dr->dt.dl.dr_data = arc_buf_alloc(spa, size, db, type); 752c717a561Smaybee bcopy(db->db.db_data, dr->dt.dl.dr_data->b_data, size); 753c717a561Smaybee } else { 754c717a561Smaybee dbuf_set_data(db, NULL); 755fa9e4066Sahrens } 756fa9e4066Sahrens } 757fa9e4066Sahrens 758c717a561Smaybee void 759c717a561Smaybee dbuf_unoverride(dbuf_dirty_record_t *dr) 760ea8dc4b6Seschrock { 761c717a561Smaybee dmu_buf_impl_t *db = dr->dr_dbuf; 762b24ab676SJeff Bonwick blkptr_t *bp = &dr->dt.dl.dr_overridden_by; 763c717a561Smaybee uint64_t txg = dr->dr_txg; 764ea8dc4b6Seschrock 765ea8dc4b6Seschrock ASSERT(MUTEX_HELD(&db->db_mtx)); 766c717a561Smaybee ASSERT(dr->dt.dl.dr_override_state != DR_IN_DMU_SYNC); 767c717a561Smaybee ASSERT(db->db_level == 0); 768ea8dc4b6Seschrock 7690a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID || 770c717a561Smaybee dr->dt.dl.dr_override_state == DR_NOT_OVERRIDDEN) 771c717a561Smaybee return; 772ea8dc4b6Seschrock 773b24ab676SJeff Bonwick ASSERT(db->db_data_pending != dr); 774b24ab676SJeff Bonwick 775c717a561Smaybee /* free this block */ 77680901aeaSGeorge Wilson if (!BP_IS_HOLE(bp) && !dr->dt.dl.dr_nopwrite) { 777744947dcSTom Erickson spa_t *spa; 778b24ab676SJeff Bonwick 779744947dcSTom Erickson DB_GET_SPA(&spa, db); 780744947dcSTom Erickson zio_free(spa, txg, bp); 781744947dcSTom Erickson } 782c717a561Smaybee dr->dt.dl.dr_override_state = DR_NOT_OVERRIDDEN; 78380901aeaSGeorge Wilson dr->dt.dl.dr_nopwrite = B_FALSE; 78480901aeaSGeorge Wilson 785c717a561Smaybee /* 786c717a561Smaybee * Release the already-written buffer, so we leave it in 787c717a561Smaybee * a consistent dirty state. Note that all callers are 788c717a561Smaybee * modifying the buffer, so they will immediately do 789c717a561Smaybee * another (redundant) arc_release(). Therefore, leave 790c717a561Smaybee * the buf thawed to save the effort of freezing & 791c717a561Smaybee * immediately re-thawing it. 792c717a561Smaybee */ 793c717a561Smaybee arc_release(dr->dt.dl.dr_data, db); 794fa9e4066Sahrens } 795fa9e4066Sahrens 796cdb0ab79Smaybee /* 797cdb0ab79Smaybee * Evict (if its unreferenced) or clear (if its referenced) any level-0 798cdb0ab79Smaybee * data blocks in the free range, so that any future readers will find 799cdb0ab79Smaybee * empty blocks. Also, if we happen accross any level-1 dbufs in the 800cdb0ab79Smaybee * range that have not already been marked dirty, mark them dirty so 801cdb0ab79Smaybee * they stay in memory. 802cdb0ab79Smaybee */ 803fa9e4066Sahrens void 804cdb0ab79Smaybee dbuf_free_range(dnode_t *dn, uint64_t start, uint64_t end, dmu_tx_t *tx) 805fa9e4066Sahrens { 806fa9e4066Sahrens dmu_buf_impl_t *db, *db_next; 807fa9e4066Sahrens uint64_t txg = tx->tx_txg; 808cdb0ab79Smaybee int epbs = dn->dn_indblkshift - SPA_BLKPTRSHIFT; 809cdb0ab79Smaybee uint64_t first_l1 = start >> epbs; 810cdb0ab79Smaybee uint64_t last_l1 = end >> epbs; 811fa9e4066Sahrens 8120a586ceaSMark Shellenbaum if (end > dn->dn_maxblkid && (end != DMU_SPILL_BLKID)) { 813cdb0ab79Smaybee end = dn->dn_maxblkid; 814cdb0ab79Smaybee last_l1 = end >> epbs; 815cdb0ab79Smaybee } 816cdb0ab79Smaybee dprintf_dnode(dn, "start=%llu end=%llu\n", start, end); 817fa9e4066Sahrens mutex_enter(&dn->dn_dbufs_mtx); 818fa9e4066Sahrens for (db = list_head(&dn->dn_dbufs); db; db = db_next) { 819fa9e4066Sahrens db_next = list_next(&dn->dn_dbufs, db); 8200a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 821cdb0ab79Smaybee 822cdb0ab79Smaybee if (db->db_level == 1 && 823cdb0ab79Smaybee db->db_blkid >= first_l1 && db->db_blkid <= last_l1) { 824cdb0ab79Smaybee mutex_enter(&db->db_mtx); 825cdb0ab79Smaybee if (db->db_last_dirty && 826cdb0ab79Smaybee db->db_last_dirty->dr_txg < txg) { 827cdb0ab79Smaybee dbuf_add_ref(db, FTAG); 828cdb0ab79Smaybee mutex_exit(&db->db_mtx); 829cdb0ab79Smaybee dbuf_will_dirty(db, tx); 830cdb0ab79Smaybee dbuf_rele(db, FTAG); 831cdb0ab79Smaybee } else { 832cdb0ab79Smaybee mutex_exit(&db->db_mtx); 833cdb0ab79Smaybee } 834cdb0ab79Smaybee } 835cdb0ab79Smaybee 836ea8dc4b6Seschrock if (db->db_level != 0) 837fa9e4066Sahrens continue; 838fa9e4066Sahrens dprintf_dbuf(db, "found buf %s\n", ""); 839cdb0ab79Smaybee if (db->db_blkid < start || db->db_blkid > end) 840fa9e4066Sahrens continue; 841fa9e4066Sahrens 842fa9e4066Sahrens /* found a level 0 buffer in the range */ 8433b2aab18SMatthew Ahrens mutex_enter(&db->db_mtx); 8443b2aab18SMatthew Ahrens if (dbuf_undirty(db, tx)) { 8453b2aab18SMatthew Ahrens /* mutex has been dropped and dbuf destroyed */ 846fa9e4066Sahrens continue; 8473b2aab18SMatthew Ahrens } 848fa9e4066Sahrens 849ea8dc4b6Seschrock if (db->db_state == DB_UNCACHED || 85082c9918fSTim Haley db->db_state == DB_NOFILL || 851ea8dc4b6Seschrock db->db_state == DB_EVICTING) { 852fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 853fa9e4066Sahrens mutex_exit(&db->db_mtx); 854fa9e4066Sahrens continue; 855fa9e4066Sahrens } 856c543ec06Sahrens if (db->db_state == DB_READ || db->db_state == DB_FILL) { 857c543ec06Sahrens /* will be handled in dbuf_read_done or dbuf_rele */ 858c717a561Smaybee db->db_freed_in_flight = TRUE; 859fa9e4066Sahrens mutex_exit(&db->db_mtx); 860fa9e4066Sahrens continue; 861fa9e4066Sahrens } 862ea8dc4b6Seschrock if (refcount_count(&db->db_holds) == 0) { 863ea8dc4b6Seschrock ASSERT(db->db_buf); 864ea8dc4b6Seschrock dbuf_clear(db); 865ea8dc4b6Seschrock continue; 866ea8dc4b6Seschrock } 867c717a561Smaybee /* The dbuf is referenced */ 868fa9e4066Sahrens 869c717a561Smaybee if (db->db_last_dirty != NULL) { 870c717a561Smaybee dbuf_dirty_record_t *dr = db->db_last_dirty; 871c717a561Smaybee 872c717a561Smaybee if (dr->dr_txg == txg) { 87344eda4d7Smaybee /* 874c717a561Smaybee * This buffer is "in-use", re-adjust the file 875c717a561Smaybee * size to reflect that this buffer may 876c717a561Smaybee * contain new data when we sync. 87744eda4d7Smaybee */ 87806e0070dSMark Shellenbaum if (db->db_blkid != DMU_SPILL_BLKID && 87906e0070dSMark Shellenbaum db->db_blkid > dn->dn_maxblkid) 880c717a561Smaybee dn->dn_maxblkid = db->db_blkid; 881c717a561Smaybee dbuf_unoverride(dr); 882c717a561Smaybee } else { 883c717a561Smaybee /* 884c717a561Smaybee * This dbuf is not dirty in the open context. 885c717a561Smaybee * Either uncache it (if its not referenced in 886c717a561Smaybee * the open context) or reset its contents to 887c717a561Smaybee * empty. 888c717a561Smaybee */ 889c717a561Smaybee dbuf_fix_old_data(db, txg); 89044eda4d7Smaybee } 891ea8dc4b6Seschrock } 892c717a561Smaybee /* clear the contents if its cached */ 893ea8dc4b6Seschrock if (db->db_state == DB_CACHED) { 894ea8dc4b6Seschrock ASSERT(db->db.db_data != NULL); 895fa9e4066Sahrens arc_release(db->db_buf, db); 896fa9e4066Sahrens bzero(db->db.db_data, db->db.db_size); 8976b4acc8bSahrens arc_buf_freeze(db->db_buf); 898fa9e4066Sahrens } 899ea8dc4b6Seschrock 900fa9e4066Sahrens mutex_exit(&db->db_mtx); 901fa9e4066Sahrens } 902fa9e4066Sahrens mutex_exit(&dn->dn_dbufs_mtx); 903fa9e4066Sahrens } 904fa9e4066Sahrens 905fa9e4066Sahrens static int 9061934e92fSmaybee dbuf_block_freeable(dmu_buf_impl_t *db) 907fa9e4066Sahrens { 908fa9e4066Sahrens dsl_dataset_t *ds = db->db_objset->os_dsl_dataset; 909fa9e4066Sahrens uint64_t birth_txg = 0; 910fa9e4066Sahrens 911fa9e4066Sahrens /* 912fa9e4066Sahrens * We don't need any locking to protect db_blkptr: 913c717a561Smaybee * If it's syncing, then db_last_dirty will be set 914c717a561Smaybee * so we'll ignore db_blkptr. 915fa9e4066Sahrens */ 916c717a561Smaybee ASSERT(MUTEX_HELD(&db->db_mtx)); 917c717a561Smaybee if (db->db_last_dirty) 918c717a561Smaybee birth_txg = db->db_last_dirty->dr_txg; 919fa9e4066Sahrens else if (db->db_blkptr) 920fa9e4066Sahrens birth_txg = db->db_blkptr->blk_birth; 921fa9e4066Sahrens 922837b568bSGeorge Wilson /* 923837b568bSGeorge Wilson * If we don't exist or are in a snapshot, we can't be freed. 924837b568bSGeorge Wilson * Don't pass the bp to dsl_dataset_block_freeable() since we 925837b568bSGeorge Wilson * are holding the db_mtx lock and might deadlock if we are 926837b568bSGeorge Wilson * prefetching a dedup-ed block. 927837b568bSGeorge Wilson */ 928fa9e4066Sahrens if (birth_txg) 9291934e92fSmaybee return (ds == NULL || 930837b568bSGeorge Wilson dsl_dataset_block_freeable(ds, NULL, birth_txg)); 931fa9e4066Sahrens else 9321934e92fSmaybee return (FALSE); 933fa9e4066Sahrens } 934fa9e4066Sahrens 935fa9e4066Sahrens void 936fa9e4066Sahrens dbuf_new_size(dmu_buf_impl_t *db, int size, dmu_tx_t *tx) 937fa9e4066Sahrens { 938fa9e4066Sahrens arc_buf_t *buf, *obuf; 939fa9e4066Sahrens int osize = db->db.db_size; 940ad23a2dbSjohansen arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 941744947dcSTom Erickson dnode_t *dn; 942fa9e4066Sahrens 9430a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 944ea8dc4b6Seschrock 945744947dcSTom Erickson DB_DNODE_ENTER(db); 946744947dcSTom Erickson dn = DB_DNODE(db); 947744947dcSTom Erickson 948fa9e4066Sahrens /* XXX does *this* func really need the lock? */ 949744947dcSTom Erickson ASSERT(RW_WRITE_HELD(&dn->dn_struct_rwlock)); 950fa9e4066Sahrens 951fa9e4066Sahrens /* 952fa9e4066Sahrens * This call to dbuf_will_dirty() with the dn_struct_rwlock held 953fa9e4066Sahrens * is OK, because there can be no other references to the db 954fa9e4066Sahrens * when we are changing its size, so no concurrent DB_FILL can 955fa9e4066Sahrens * be happening. 956fa9e4066Sahrens */ 957ea8dc4b6Seschrock /* 958ea8dc4b6Seschrock * XXX we should be doing a dbuf_read, checking the return 959ea8dc4b6Seschrock * value and returning that up to our callers 960ea8dc4b6Seschrock */ 961fa9e4066Sahrens dbuf_will_dirty(db, tx); 962fa9e4066Sahrens 963fa9e4066Sahrens /* create the data buffer for the new block */ 964744947dcSTom Erickson buf = arc_buf_alloc(dn->dn_objset->os_spa, size, db, type); 965fa9e4066Sahrens 966fa9e4066Sahrens /* copy old block data to the new block */ 967fa9e4066Sahrens obuf = db->db_buf; 968f65e61c0Sahrens bcopy(obuf->b_data, buf->b_data, MIN(osize, size)); 969fa9e4066Sahrens /* zero the remainder */ 970f65e61c0Sahrens if (size > osize) 971f65e61c0Sahrens bzero((uint8_t *)buf->b_data + osize, size - osize); 972fa9e4066Sahrens 973fa9e4066Sahrens mutex_enter(&db->db_mtx); 974fa9e4066Sahrens dbuf_set_data(db, buf); 9753b2aab18SMatthew Ahrens VERIFY(arc_buf_remove_ref(obuf, db)); 976fa9e4066Sahrens db->db.db_size = size; 977fa9e4066Sahrens 978c717a561Smaybee if (db->db_level == 0) { 979c717a561Smaybee ASSERT3U(db->db_last_dirty->dr_txg, ==, tx->tx_txg); 980c717a561Smaybee db->db_last_dirty->dt.dl.dr_data = buf; 981c717a561Smaybee } 982fa9e4066Sahrens mutex_exit(&db->db_mtx); 983fa9e4066Sahrens 984744947dcSTom Erickson dnode_willuse_space(dn, size-osize, tx); 985744947dcSTom Erickson DB_DNODE_EXIT(db); 986fa9e4066Sahrens } 987fa9e4066Sahrens 9883f9d6ad7SLin Ling void 9893f9d6ad7SLin Ling dbuf_release_bp(dmu_buf_impl_t *db) 9903f9d6ad7SLin Ling { 991744947dcSTom Erickson objset_t *os; 9923f9d6ad7SLin Ling 993744947dcSTom Erickson DB_GET_OBJSET(&os, db); 9943f9d6ad7SLin Ling ASSERT(dsl_pool_sync_context(dmu_objset_pool(os))); 9953f9d6ad7SLin Ling ASSERT(arc_released(os->os_phys_buf) || 9963f9d6ad7SLin Ling list_link_active(&os->os_dsl_dataset->ds_synced_link)); 9973f9d6ad7SLin Ling ASSERT(db->db_parent == NULL || arc_released(db->db_parent->db_buf)); 9983f9d6ad7SLin Ling 9991b912ec7SGeorge Wilson (void) arc_release(db->db_buf, db); 10003f9d6ad7SLin Ling } 10013f9d6ad7SLin Ling 1002c717a561Smaybee dbuf_dirty_record_t * 1003fa9e4066Sahrens dbuf_dirty(dmu_buf_impl_t *db, dmu_tx_t *tx) 1004fa9e4066Sahrens { 1005744947dcSTom Erickson dnode_t *dn; 1006744947dcSTom Erickson objset_t *os; 1007c717a561Smaybee dbuf_dirty_record_t **drp, *dr; 1008fa9e4066Sahrens int drop_struct_lock = FALSE; 1009d3469faaSMark Maybee boolean_t do_free_accounting = B_FALSE; 1010fa9e4066Sahrens int txgoff = tx->tx_txg & TXG_MASK; 1011fa9e4066Sahrens 1012fa9e4066Sahrens ASSERT(tx->tx_txg != 0); 1013fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 10149c9dc39aSek DMU_TX_DIRTY_BUF(tx, db); 1015fa9e4066Sahrens 1016744947dcSTom Erickson DB_DNODE_ENTER(db); 1017744947dcSTom Erickson dn = DB_DNODE(db); 1018fa9e4066Sahrens /* 1019fa9e4066Sahrens * Shouldn't dirty a regular buffer in syncing context. Private 1020fa9e4066Sahrens * objects may be dirtied in syncing context, but only if they 1021fa9e4066Sahrens * were already pre-dirtied in open context. 1022fa9e4066Sahrens */ 1023c717a561Smaybee ASSERT(!dmu_tx_is_syncing(tx) || 1024c717a561Smaybee BP_IS_HOLE(dn->dn_objset->os_rootbp) || 102514843421SMatthew Ahrens DMU_OBJECT_IS_SPECIAL(dn->dn_object) || 102614843421SMatthew Ahrens dn->dn_objset->os_dsl_dataset == NULL); 1027fa9e4066Sahrens /* 1028fa9e4066Sahrens * We make this assert for private objects as well, but after we 1029fa9e4066Sahrens * check if we're already dirty. They are allowed to re-dirty 1030fa9e4066Sahrens * in syncing context. 1031fa9e4066Sahrens */ 1032ea8dc4b6Seschrock ASSERT(dn->dn_object == DMU_META_DNODE_OBJECT || 1033c717a561Smaybee dn->dn_dirtyctx == DN_UNDIRTIED || dn->dn_dirtyctx == 1034fa9e4066Sahrens (dmu_tx_is_syncing(tx) ? DN_DIRTY_SYNC : DN_DIRTY_OPEN)); 1035fa9e4066Sahrens 1036fa9e4066Sahrens mutex_enter(&db->db_mtx); 1037fa9e4066Sahrens /* 1038c717a561Smaybee * XXX make this true for indirects too? The problem is that 1039c717a561Smaybee * transactions created with dmu_tx_create_assigned() from 1040c717a561Smaybee * syncing context don't bother holding ahead. 1041fa9e4066Sahrens */ 1042c717a561Smaybee ASSERT(db->db_level != 0 || 104382c9918fSTim Haley db->db_state == DB_CACHED || db->db_state == DB_FILL || 104482c9918fSTim Haley db->db_state == DB_NOFILL); 1045fa9e4066Sahrens 1046fa9e4066Sahrens mutex_enter(&dn->dn_mtx); 1047fa9e4066Sahrens /* 1048fa9e4066Sahrens * Don't set dirtyctx to SYNC if we're just modifying this as we 1049fa9e4066Sahrens * initialize the objset. 1050fa9e4066Sahrens */ 1051fa9e4066Sahrens if (dn->dn_dirtyctx == DN_UNDIRTIED && 1052c717a561Smaybee !BP_IS_HOLE(dn->dn_objset->os_rootbp)) { 1053fa9e4066Sahrens dn->dn_dirtyctx = 1054fa9e4066Sahrens (dmu_tx_is_syncing(tx) ? DN_DIRTY_SYNC : DN_DIRTY_OPEN); 1055fa9e4066Sahrens ASSERT(dn->dn_dirtyctx_firstset == NULL); 1056fa9e4066Sahrens dn->dn_dirtyctx_firstset = kmem_alloc(1, KM_SLEEP); 1057fa9e4066Sahrens } 1058fa9e4066Sahrens mutex_exit(&dn->dn_mtx); 1059fa9e4066Sahrens 10600a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) 10610a586ceaSMark Shellenbaum dn->dn_have_spill = B_TRUE; 10620a586ceaSMark Shellenbaum 1063fa9e4066Sahrens /* 1064fa9e4066Sahrens * If this buffer is already dirty, we're done. 1065fa9e4066Sahrens */ 1066c717a561Smaybee drp = &db->db_last_dirty; 1067c717a561Smaybee ASSERT(*drp == NULL || (*drp)->dr_txg <= tx->tx_txg || 1068c717a561Smaybee db->db.db_object == DMU_META_DNODE_OBJECT); 10697e2186e3Sbonwick while ((dr = *drp) != NULL && dr->dr_txg > tx->tx_txg) 10707e2186e3Sbonwick drp = &dr->dr_next; 10717e2186e3Sbonwick if (dr && dr->dr_txg == tx->tx_txg) { 1072744947dcSTom Erickson DB_DNODE_EXIT(db); 1073744947dcSTom Erickson 10740a586ceaSMark Shellenbaum if (db->db_level == 0 && db->db_blkid != DMU_BONUS_BLKID) { 1075c717a561Smaybee /* 1076c717a561Smaybee * If this buffer has already been written out, 1077c717a561Smaybee * we now need to reset its state. 1078c717a561Smaybee */ 10797e2186e3Sbonwick dbuf_unoverride(dr); 1080b24ab676SJeff Bonwick if (db->db.db_object != DMU_META_DNODE_OBJECT && 1081b24ab676SJeff Bonwick db->db_state != DB_NOFILL) 1082c717a561Smaybee arc_buf_thaw(db->db_buf); 1083c717a561Smaybee } 1084fa9e4066Sahrens mutex_exit(&db->db_mtx); 10857e2186e3Sbonwick return (dr); 1086fa9e4066Sahrens } 1087fa9e4066Sahrens 1088fa9e4066Sahrens /* 1089fa9e4066Sahrens * Only valid if not already dirty. 1090fa9e4066Sahrens */ 109114843421SMatthew Ahrens ASSERT(dn->dn_object == 0 || 109214843421SMatthew Ahrens dn->dn_dirtyctx == DN_UNDIRTIED || dn->dn_dirtyctx == 1093fa9e4066Sahrens (dmu_tx_is_syncing(tx) ? DN_DIRTY_SYNC : DN_DIRTY_OPEN)); 1094fa9e4066Sahrens 1095fa9e4066Sahrens ASSERT3U(dn->dn_nlevels, >, db->db_level); 1096fa9e4066Sahrens ASSERT((dn->dn_phys->dn_nlevels == 0 && db->db_level == 0) || 1097fa9e4066Sahrens dn->dn_phys->dn_nlevels > db->db_level || 1098fa9e4066Sahrens dn->dn_next_nlevels[txgoff] > db->db_level || 1099fa9e4066Sahrens dn->dn_next_nlevels[(tx->tx_txg-1) & TXG_MASK] > db->db_level || 1100fa9e4066Sahrens dn->dn_next_nlevels[(tx->tx_txg-2) & TXG_MASK] > db->db_level); 1101fa9e4066Sahrens 1102fa9e4066Sahrens /* 1103fa9e4066Sahrens * We should only be dirtying in syncing context if it's the 110414843421SMatthew Ahrens * mos or we're initializing the os or it's a special object. 110514843421SMatthew Ahrens * However, we are allowed to dirty in syncing context provided 110614843421SMatthew Ahrens * we already dirtied it in open context. Hence we must make 110714843421SMatthew Ahrens * this assertion only if we're not already dirty. 1108fa9e4066Sahrens */ 1109744947dcSTom Erickson os = dn->dn_objset; 111014843421SMatthew Ahrens ASSERT(!dmu_tx_is_syncing(tx) || DMU_OBJECT_IS_SPECIAL(dn->dn_object) || 111114843421SMatthew Ahrens os->os_dsl_dataset == NULL || BP_IS_HOLE(os->os_rootbp)); 1112fa9e4066Sahrens ASSERT(db->db.db_size != 0); 1113fa9e4066Sahrens 1114fa9e4066Sahrens dprintf_dbuf(db, "size=%llx\n", (u_longlong_t)db->db.db_size); 1115fa9e4066Sahrens 11160a586ceaSMark Shellenbaum if (db->db_blkid != DMU_BONUS_BLKID) { 11171934e92fSmaybee /* 11181934e92fSmaybee * Update the accounting. 1119d3469faaSMark Maybee * Note: we delay "free accounting" until after we drop 1120d3469faaSMark Maybee * the db_mtx. This keeps us from grabbing other locks 1121b24ab676SJeff Bonwick * (and possibly deadlocking) in bp_get_dsize() while 1122d3469faaSMark Maybee * also holding the db_mtx. 11231934e92fSmaybee */ 11241934e92fSmaybee dnode_willuse_space(dn, db->db.db_size, tx); 1125d3469faaSMark Maybee do_free_accounting = dbuf_block_freeable(db); 11261934e92fSmaybee } 11271934e92fSmaybee 1128ea8dc4b6Seschrock /* 1129ea8dc4b6Seschrock * If this buffer is dirty in an old transaction group we need 1130ea8dc4b6Seschrock * to make a copy of it so that the changes we make in this 1131ea8dc4b6Seschrock * transaction group won't leak out when we sync the older txg. 1132ea8dc4b6Seschrock */ 1133c717a561Smaybee dr = kmem_zalloc(sizeof (dbuf_dirty_record_t), KM_SLEEP); 1134c717a561Smaybee if (db->db_level == 0) { 1135c717a561Smaybee void *data_old = db->db_buf; 1136c717a561Smaybee 113782c9918fSTim Haley if (db->db_state != DB_NOFILL) { 11380a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 113982c9918fSTim Haley dbuf_fix_old_data(db, tx->tx_txg); 114082c9918fSTim Haley data_old = db->db.db_data; 114182c9918fSTim Haley } else if (db->db.db_object != DMU_META_DNODE_OBJECT) { 114282c9918fSTim Haley /* 114382c9918fSTim Haley * Release the data buffer from the cache so 114482c9918fSTim Haley * that we can modify it without impacting 114582c9918fSTim Haley * possible other users of this cached data 114682c9918fSTim Haley * block. Note that indirect blocks and 114782c9918fSTim Haley * private objects are not released until the 114882c9918fSTim Haley * syncing state (since they are only modified 114982c9918fSTim Haley * then). 115082c9918fSTim Haley */ 115182c9918fSTim Haley arc_release(db->db_buf, db); 115282c9918fSTim Haley dbuf_fix_old_data(db, tx->tx_txg); 115382c9918fSTim Haley data_old = db->db_buf; 115482c9918fSTim Haley } 115582c9918fSTim Haley ASSERT(data_old != NULL); 1156fa9e4066Sahrens } 1157c717a561Smaybee dr->dt.dl.dr_data = data_old; 1158c717a561Smaybee } else { 1159c717a561Smaybee mutex_init(&dr->dt.di.dr_mtx, NULL, MUTEX_DEFAULT, NULL); 1160c717a561Smaybee list_create(&dr->dt.di.dr_children, 1161c717a561Smaybee sizeof (dbuf_dirty_record_t), 1162c717a561Smaybee offsetof(dbuf_dirty_record_t, dr_dirty_node)); 1163fa9e4066Sahrens } 1164c717a561Smaybee dr->dr_dbuf = db; 1165c717a561Smaybee dr->dr_txg = tx->tx_txg; 1166c717a561Smaybee dr->dr_next = *drp; 1167c717a561Smaybee *drp = dr; 1168fa9e4066Sahrens 1169fa9e4066Sahrens /* 1170fa9e4066Sahrens * We could have been freed_in_flight between the dbuf_noread 1171fa9e4066Sahrens * and dbuf_dirty. We win, as though the dbuf_noread() had 1172fa9e4066Sahrens * happened after the free. 1173fa9e4066Sahrens */ 11740a586ceaSMark Shellenbaum if (db->db_level == 0 && db->db_blkid != DMU_BONUS_BLKID && 11750a586ceaSMark Shellenbaum db->db_blkid != DMU_SPILL_BLKID) { 1176c717a561Smaybee mutex_enter(&dn->dn_mtx); 1177fa9e4066Sahrens dnode_clear_range(dn, db->db_blkid, 1, tx); 1178c717a561Smaybee mutex_exit(&dn->dn_mtx); 1179c717a561Smaybee db->db_freed_in_flight = FALSE; 1180fa9e4066Sahrens } 1181fa9e4066Sahrens 1182fa9e4066Sahrens /* 1183fa9e4066Sahrens * This buffer is now part of this txg 1184fa9e4066Sahrens */ 1185fa9e4066Sahrens dbuf_add_ref(db, (void *)(uintptr_t)tx->tx_txg); 1186fa9e4066Sahrens db->db_dirtycnt += 1; 1187fa9e4066Sahrens ASSERT3U(db->db_dirtycnt, <=, 3); 1188fa9e4066Sahrens 1189fa9e4066Sahrens mutex_exit(&db->db_mtx); 1190fa9e4066Sahrens 11910a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID || 11920a586ceaSMark Shellenbaum db->db_blkid == DMU_SPILL_BLKID) { 1193c717a561Smaybee mutex_enter(&dn->dn_mtx); 1194c717a561Smaybee ASSERT(!list_link_active(&dr->dr_dirty_node)); 1195c717a561Smaybee list_insert_tail(&dn->dn_dirty_records[txgoff], dr); 1196c717a561Smaybee mutex_exit(&dn->dn_mtx); 1197fa9e4066Sahrens dnode_setdirty(dn, tx); 1198744947dcSTom Erickson DB_DNODE_EXIT(db); 1199c717a561Smaybee return (dr); 1200d3469faaSMark Maybee } else if (do_free_accounting) { 1201d3469faaSMark Maybee blkptr_t *bp = db->db_blkptr; 1202d3469faaSMark Maybee int64_t willfree = (bp && !BP_IS_HOLE(bp)) ? 1203b24ab676SJeff Bonwick bp_get_dsize(os->os_spa, bp) : db->db.db_size; 1204d3469faaSMark Maybee /* 1205d3469faaSMark Maybee * This is only a guess -- if the dbuf is dirty 1206d3469faaSMark Maybee * in a previous txg, we don't know how much 1207d3469faaSMark Maybee * space it will use on disk yet. We should 1208d3469faaSMark Maybee * really have the struct_rwlock to access 1209d3469faaSMark Maybee * db_blkptr, but since this is just a guess, 1210d3469faaSMark Maybee * it's OK if we get an odd answer. 1211d3469faaSMark Maybee */ 1212837b568bSGeorge Wilson ddt_prefetch(os->os_spa, bp); 1213d3469faaSMark Maybee dnode_willuse_space(dn, -willfree, tx); 1214fa9e4066Sahrens } 1215fa9e4066Sahrens 1216fa9e4066Sahrens if (!RW_WRITE_HELD(&dn->dn_struct_rwlock)) { 1217fa9e4066Sahrens rw_enter(&dn->dn_struct_rwlock, RW_READER); 1218fa9e4066Sahrens drop_struct_lock = TRUE; 1219fa9e4066Sahrens } 1220fa9e4066Sahrens 12218346f03fSJonathan W Adams if (db->db_level == 0) { 12228346f03fSJonathan W Adams dnode_new_blkid(dn, db->db_blkid, tx, drop_struct_lock); 12238346f03fSJonathan W Adams ASSERT(dn->dn_maxblkid >= db->db_blkid); 12248346f03fSJonathan W Adams } 12258346f03fSJonathan W Adams 122644eda4d7Smaybee if (db->db_level+1 < dn->dn_nlevels) { 1227c717a561Smaybee dmu_buf_impl_t *parent = db->db_parent; 1228c717a561Smaybee dbuf_dirty_record_t *di; 1229c717a561Smaybee int parent_held = FALSE; 1230c717a561Smaybee 1231c717a561Smaybee if (db->db_parent == NULL || db->db_parent == dn->dn_dbuf) { 1232c717a561Smaybee int epbs = dn->dn_indblkshift - SPA_BLKPTRSHIFT; 1233c717a561Smaybee 1234c717a561Smaybee parent = dbuf_hold_level(dn, db->db_level+1, 1235c717a561Smaybee db->db_blkid >> epbs, FTAG); 123601025c89SJohn Harres ASSERT(parent != NULL); 1237c717a561Smaybee parent_held = TRUE; 1238c717a561Smaybee } 1239fa9e4066Sahrens if (drop_struct_lock) 1240fa9e4066Sahrens rw_exit(&dn->dn_struct_rwlock); 1241c717a561Smaybee ASSERT3U(db->db_level+1, ==, parent->db_level); 1242c717a561Smaybee di = dbuf_dirty(parent, tx); 1243c717a561Smaybee if (parent_held) 1244c717a561Smaybee dbuf_rele(parent, FTAG); 1245c717a561Smaybee 1246c717a561Smaybee mutex_enter(&db->db_mtx); 1247c717a561Smaybee /* possible race with dbuf_undirty() */ 1248c717a561Smaybee if (db->db_last_dirty == dr || 1249c717a561Smaybee dn->dn_object == DMU_META_DNODE_OBJECT) { 1250c717a561Smaybee mutex_enter(&di->dt.di.dr_mtx); 1251c717a561Smaybee ASSERT3U(di->dr_txg, ==, tx->tx_txg); 1252c717a561Smaybee ASSERT(!list_link_active(&dr->dr_dirty_node)); 1253c717a561Smaybee list_insert_tail(&di->dt.di.dr_children, dr); 1254c717a561Smaybee mutex_exit(&di->dt.di.dr_mtx); 1255c717a561Smaybee dr->dr_parent = di; 1256c717a561Smaybee } 1257c717a561Smaybee mutex_exit(&db->db_mtx); 1258fa9e4066Sahrens } else { 1259c717a561Smaybee ASSERT(db->db_level+1 == dn->dn_nlevels); 1260c717a561Smaybee ASSERT(db->db_blkid < dn->dn_nblkptr); 1261744947dcSTom Erickson ASSERT(db->db_parent == NULL || db->db_parent == dn->dn_dbuf); 1262c717a561Smaybee mutex_enter(&dn->dn_mtx); 1263c717a561Smaybee ASSERT(!list_link_active(&dr->dr_dirty_node)); 1264c717a561Smaybee list_insert_tail(&dn->dn_dirty_records[txgoff], dr); 1265c717a561Smaybee mutex_exit(&dn->dn_mtx); 1266fa9e4066Sahrens if (drop_struct_lock) 1267fa9e4066Sahrens rw_exit(&dn->dn_struct_rwlock); 1268fa9e4066Sahrens } 1269fa9e4066Sahrens 1270fa9e4066Sahrens dnode_setdirty(dn, tx); 1271744947dcSTom Erickson DB_DNODE_EXIT(db); 1272c717a561Smaybee return (dr); 1273fa9e4066Sahrens } 1274fa9e4066Sahrens 12753b2aab18SMatthew Ahrens /* 1276*3e30c24aSWill Andrews * Undirty a buffer in the transaction group referenced by the given 1277*3e30c24aSWill Andrews * transaction. Return whether this evicted the dbuf. 12783b2aab18SMatthew Ahrens */ 12793b2aab18SMatthew Ahrens static boolean_t 1280fa9e4066Sahrens dbuf_undirty(dmu_buf_impl_t *db, dmu_tx_t *tx) 1281fa9e4066Sahrens { 1282744947dcSTom Erickson dnode_t *dn; 1283c717a561Smaybee uint64_t txg = tx->tx_txg; 128417f17c2dSbonwick dbuf_dirty_record_t *dr, **drp; 1285fa9e4066Sahrens 1286c717a561Smaybee ASSERT(txg != 0); 12870a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 12883b2aab18SMatthew Ahrens ASSERT0(db->db_level); 12893b2aab18SMatthew Ahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 1290fa9e4066Sahrens 1291fa9e4066Sahrens /* 1292fa9e4066Sahrens * If this buffer is not dirty, we're done. 1293fa9e4066Sahrens */ 129417f17c2dSbonwick for (drp = &db->db_last_dirty; (dr = *drp) != NULL; drp = &dr->dr_next) 1295c717a561Smaybee if (dr->dr_txg <= txg) 1296c717a561Smaybee break; 12973b2aab18SMatthew Ahrens if (dr == NULL || dr->dr_txg < txg) 12983b2aab18SMatthew Ahrens return (B_FALSE); 1299c717a561Smaybee ASSERT(dr->dr_txg == txg); 1300b24ab676SJeff Bonwick ASSERT(dr->dr_dbuf == db); 1301fa9e4066Sahrens 1302744947dcSTom Erickson DB_DNODE_ENTER(db); 1303744947dcSTom Erickson dn = DB_DNODE(db); 1304744947dcSTom Erickson 1305fa9e4066Sahrens /* 13063b2aab18SMatthew Ahrens * Note: This code will probably work even if there are concurrent 13073b2aab18SMatthew Ahrens * holders, but it is untested in that scenerio, as the ZPL and 13083b2aab18SMatthew Ahrens * ztest have additional locking (the range locks) that prevents 13093b2aab18SMatthew Ahrens * that type of concurrent access. 1310fa9e4066Sahrens */ 13113b2aab18SMatthew Ahrens ASSERT3U(refcount_count(&db->db_holds), ==, db->db_dirtycnt); 1312fa9e4066Sahrens 1313fa9e4066Sahrens dprintf_dbuf(db, "size=%llx\n", (u_longlong_t)db->db.db_size); 1314fa9e4066Sahrens 1315fa9e4066Sahrens ASSERT(db->db.db_size != 0); 1316fa9e4066Sahrens 1317fa9e4066Sahrens /* XXX would be nice to fix up dn_towrite_space[] */ 1318fa9e4066Sahrens 131917f17c2dSbonwick *drp = dr->dr_next; 1320c717a561Smaybee 13213f2366c2SGordon Ross /* 13223f2366c2SGordon Ross * Note that there are three places in dbuf_dirty() 13233f2366c2SGordon Ross * where this dirty record may be put on a list. 13243f2366c2SGordon Ross * Make sure to do a list_remove corresponding to 13253f2366c2SGordon Ross * every one of those list_insert calls. 13263f2366c2SGordon Ross */ 1327c717a561Smaybee if (dr->dr_parent) { 1328c717a561Smaybee mutex_enter(&dr->dr_parent->dt.di.dr_mtx); 1329c717a561Smaybee list_remove(&dr->dr_parent->dt.di.dr_children, dr); 1330c717a561Smaybee mutex_exit(&dr->dr_parent->dt.di.dr_mtx); 13313f2366c2SGordon Ross } else if (db->db_blkid == DMU_SPILL_BLKID || 13323f2366c2SGordon Ross db->db_level+1 == dn->dn_nlevels) { 1333cdb0ab79Smaybee ASSERT(db->db_blkptr == NULL || db->db_parent == dn->dn_dbuf); 1334c717a561Smaybee mutex_enter(&dn->dn_mtx); 1335c717a561Smaybee list_remove(&dn->dn_dirty_records[txg & TXG_MASK], dr); 1336c717a561Smaybee mutex_exit(&dn->dn_mtx); 1337c717a561Smaybee } 1338744947dcSTom Erickson DB_DNODE_EXIT(db); 1339c717a561Smaybee 13403b2aab18SMatthew Ahrens if (db->db_state != DB_NOFILL) { 13413b2aab18SMatthew Ahrens dbuf_unoverride(dr); 1342c717a561Smaybee 1343c717a561Smaybee ASSERT(db->db_buf != NULL); 13443b2aab18SMatthew Ahrens ASSERT(dr->dt.dl.dr_data != NULL); 13453b2aab18SMatthew Ahrens if (dr->dt.dl.dr_data != db->db_buf) 13463b2aab18SMatthew Ahrens VERIFY(arc_buf_remove_ref(dr->dt.dl.dr_data, db)); 1347c717a561Smaybee } 1348c717a561Smaybee kmem_free(dr, sizeof (dbuf_dirty_record_t)); 1349fa9e4066Sahrens 1350fa9e4066Sahrens ASSERT(db->db_dirtycnt > 0); 1351fa9e4066Sahrens db->db_dirtycnt -= 1; 1352fa9e4066Sahrens 1353c717a561Smaybee if (refcount_remove(&db->db_holds, (void *)(uintptr_t)txg) == 0) { 1354ea8dc4b6Seschrock arc_buf_t *buf = db->db_buf; 1355fa9e4066Sahrens 1356b24ab676SJeff Bonwick ASSERT(db->db_state == DB_NOFILL || arc_released(buf)); 1357ea8dc4b6Seschrock dbuf_set_data(db, NULL); 13583b2aab18SMatthew Ahrens VERIFY(arc_buf_remove_ref(buf, db)); 1359fa9e4066Sahrens dbuf_evict(db); 13603b2aab18SMatthew Ahrens return (B_TRUE); 1361fa9e4066Sahrens } 1362fa9e4066Sahrens 13633b2aab18SMatthew Ahrens return (B_FALSE); 1364fa9e4066Sahrens } 1365fa9e4066Sahrens 1366fa9e4066Sahrens #pragma weak dmu_buf_will_dirty = dbuf_will_dirty 1367fa9e4066Sahrens void 1368fa9e4066Sahrens dbuf_will_dirty(dmu_buf_impl_t *db, dmu_tx_t *tx) 1369fa9e4066Sahrens { 13701ab7f2deSmaybee int rf = DB_RF_MUST_SUCCEED | DB_RF_NOPREFETCH; 1371fa9e4066Sahrens 1372fa9e4066Sahrens ASSERT(tx->tx_txg != 0); 1373fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 1374fa9e4066Sahrens 1375744947dcSTom Erickson DB_DNODE_ENTER(db); 1376744947dcSTom Erickson if (RW_WRITE_HELD(&DB_DNODE(db)->dn_struct_rwlock)) 1377fa9e4066Sahrens rf |= DB_RF_HAVESTRUCT; 1378744947dcSTom Erickson DB_DNODE_EXIT(db); 1379ea8dc4b6Seschrock (void) dbuf_read(db, NULL, rf); 1380c717a561Smaybee (void) dbuf_dirty(db, tx); 1381fa9e4066Sahrens } 1382fa9e4066Sahrens 138382c9918fSTim Haley void 138482c9918fSTim Haley dmu_buf_will_not_fill(dmu_buf_t *db_fake, dmu_tx_t *tx) 138582c9918fSTim Haley { 138682c9918fSTim Haley dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 138782c9918fSTim Haley 138882c9918fSTim Haley db->db_state = DB_NOFILL; 138982c9918fSTim Haley 139082c9918fSTim Haley dmu_buf_will_fill(db_fake, tx); 139182c9918fSTim Haley } 139282c9918fSTim Haley 1393fa9e4066Sahrens void 1394ea8dc4b6Seschrock dmu_buf_will_fill(dmu_buf_t *db_fake, dmu_tx_t *tx) 1395fa9e4066Sahrens { 1396ea8dc4b6Seschrock dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 1397ea8dc4b6Seschrock 13980a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 1399fa9e4066Sahrens ASSERT(tx->tx_txg != 0); 1400fa9e4066Sahrens ASSERT(db->db_level == 0); 1401fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 1402fa9e4066Sahrens 1403ea8dc4b6Seschrock ASSERT(db->db.db_object != DMU_META_DNODE_OBJECT || 1404fa9e4066Sahrens dmu_tx_private_ok(tx)); 1405fa9e4066Sahrens 1406fa9e4066Sahrens dbuf_noread(db); 1407c717a561Smaybee (void) dbuf_dirty(db, tx); 1408fa9e4066Sahrens } 1409fa9e4066Sahrens 1410fa9e4066Sahrens #pragma weak dmu_buf_fill_done = dbuf_fill_done 1411fa9e4066Sahrens /* ARGSUSED */ 1412fa9e4066Sahrens void 1413fa9e4066Sahrens dbuf_fill_done(dmu_buf_impl_t *db, dmu_tx_t *tx) 1414fa9e4066Sahrens { 1415fa9e4066Sahrens mutex_enter(&db->db_mtx); 14169c9dc39aSek DBUF_VERIFY(db); 1417fa9e4066Sahrens 1418fa9e4066Sahrens if (db->db_state == DB_FILL) { 1419c717a561Smaybee if (db->db_level == 0 && db->db_freed_in_flight) { 14200a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 1421fa9e4066Sahrens /* we were freed while filling */ 1422fa9e4066Sahrens /* XXX dbuf_undirty? */ 1423fa9e4066Sahrens bzero(db->db.db_data, db->db.db_size); 1424c717a561Smaybee db->db_freed_in_flight = FALSE; 1425fa9e4066Sahrens } 1426fa9e4066Sahrens db->db_state = DB_CACHED; 1427fa9e4066Sahrens cv_broadcast(&db->db_changed); 1428fa9e4066Sahrens } 1429fa9e4066Sahrens mutex_exit(&db->db_mtx); 1430fa9e4066Sahrens } 1431fa9e4066Sahrens 14322fdbea25SAleksandr Guzovskiy /* 14332fdbea25SAleksandr Guzovskiy * Directly assign a provided arc buf to a given dbuf if it's not referenced 14342fdbea25SAleksandr Guzovskiy * by anybody except our caller. Otherwise copy arcbuf's contents to dbuf. 14352fdbea25SAleksandr Guzovskiy */ 14362fdbea25SAleksandr Guzovskiy void 14372fdbea25SAleksandr Guzovskiy dbuf_assign_arcbuf(dmu_buf_impl_t *db, arc_buf_t *buf, dmu_tx_t *tx) 14382fdbea25SAleksandr Guzovskiy { 14392fdbea25SAleksandr Guzovskiy ASSERT(!refcount_is_zero(&db->db_holds)); 14400a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 14412fdbea25SAleksandr Guzovskiy ASSERT(db->db_level == 0); 14422fdbea25SAleksandr Guzovskiy ASSERT(DBUF_GET_BUFC_TYPE(db) == ARC_BUFC_DATA); 14432fdbea25SAleksandr Guzovskiy ASSERT(buf != NULL); 14442fdbea25SAleksandr Guzovskiy ASSERT(arc_buf_size(buf) == db->db.db_size); 14452fdbea25SAleksandr Guzovskiy ASSERT(tx->tx_txg != 0); 14462fdbea25SAleksandr Guzovskiy 14472fdbea25SAleksandr Guzovskiy arc_return_buf(buf, db); 14482fdbea25SAleksandr Guzovskiy ASSERT(arc_released(buf)); 14492fdbea25SAleksandr Guzovskiy 14502fdbea25SAleksandr Guzovskiy mutex_enter(&db->db_mtx); 14512fdbea25SAleksandr Guzovskiy 14522fdbea25SAleksandr Guzovskiy while (db->db_state == DB_READ || db->db_state == DB_FILL) 14532fdbea25SAleksandr Guzovskiy cv_wait(&db->db_changed, &db->db_mtx); 14542fdbea25SAleksandr Guzovskiy 14552fdbea25SAleksandr Guzovskiy ASSERT(db->db_state == DB_CACHED || db->db_state == DB_UNCACHED); 14562fdbea25SAleksandr Guzovskiy 14572fdbea25SAleksandr Guzovskiy if (db->db_state == DB_CACHED && 14582fdbea25SAleksandr Guzovskiy refcount_count(&db->db_holds) - 1 > db->db_dirtycnt) { 14592fdbea25SAleksandr Guzovskiy mutex_exit(&db->db_mtx); 14602fdbea25SAleksandr Guzovskiy (void) dbuf_dirty(db, tx); 14612fdbea25SAleksandr Guzovskiy bcopy(buf->b_data, db->db.db_data, db->db.db_size); 14623b2aab18SMatthew Ahrens VERIFY(arc_buf_remove_ref(buf, db)); 1463c242f9a0Schunli zhang - Sun Microsystems - Irvine United States xuio_stat_wbuf_copied(); 14642fdbea25SAleksandr Guzovskiy return; 14652fdbea25SAleksandr Guzovskiy } 14662fdbea25SAleksandr Guzovskiy 1467c242f9a0Schunli zhang - Sun Microsystems - Irvine United States xuio_stat_wbuf_nocopy(); 14682fdbea25SAleksandr Guzovskiy if (db->db_state == DB_CACHED) { 14692fdbea25SAleksandr Guzovskiy dbuf_dirty_record_t *dr = db->db_last_dirty; 14702fdbea25SAleksandr Guzovskiy 14712fdbea25SAleksandr Guzovskiy ASSERT(db->db_buf != NULL); 14722fdbea25SAleksandr Guzovskiy if (dr != NULL && dr->dr_txg == tx->tx_txg) { 14732fdbea25SAleksandr Guzovskiy ASSERT(dr->dt.dl.dr_data == db->db_buf); 14742fdbea25SAleksandr Guzovskiy if (!arc_released(db->db_buf)) { 14752fdbea25SAleksandr Guzovskiy ASSERT(dr->dt.dl.dr_override_state == 14762fdbea25SAleksandr Guzovskiy DR_OVERRIDDEN); 14772fdbea25SAleksandr Guzovskiy arc_release(db->db_buf, db); 14782fdbea25SAleksandr Guzovskiy } 14792fdbea25SAleksandr Guzovskiy dr->dt.dl.dr_data = buf; 14803b2aab18SMatthew Ahrens VERIFY(arc_buf_remove_ref(db->db_buf, db)); 14812fdbea25SAleksandr Guzovskiy } else if (dr == NULL || dr->dt.dl.dr_data != db->db_buf) { 14822fdbea25SAleksandr Guzovskiy arc_release(db->db_buf, db); 14833b2aab18SMatthew Ahrens VERIFY(arc_buf_remove_ref(db->db_buf, db)); 14842fdbea25SAleksandr Guzovskiy } 14852fdbea25SAleksandr Guzovskiy db->db_buf = NULL; 14862fdbea25SAleksandr Guzovskiy } 14872fdbea25SAleksandr Guzovskiy ASSERT(db->db_buf == NULL); 14882fdbea25SAleksandr Guzovskiy dbuf_set_data(db, buf); 14892fdbea25SAleksandr Guzovskiy db->db_state = DB_FILL; 14902fdbea25SAleksandr Guzovskiy mutex_exit(&db->db_mtx); 14912fdbea25SAleksandr Guzovskiy (void) dbuf_dirty(db, tx); 14922fdbea25SAleksandr Guzovskiy dbuf_fill_done(db, tx); 14932fdbea25SAleksandr Guzovskiy } 14942fdbea25SAleksandr Guzovskiy 1495ea8dc4b6Seschrock /* 1496ea8dc4b6Seschrock * "Clear" the contents of this dbuf. This will mark the dbuf 1497ea8dc4b6Seschrock * EVICTING and clear *most* of its references. Unfortunetely, 1498ea8dc4b6Seschrock * when we are not holding the dn_dbufs_mtx, we can't clear the 1499ea8dc4b6Seschrock * entry in the dn_dbufs list. We have to wait until dbuf_destroy() 1500ea8dc4b6Seschrock * in this case. For callers from the DMU we will usually see: 1501ea8dc4b6Seschrock * dbuf_clear()->arc_buf_evict()->dbuf_do_evict()->dbuf_destroy() 1502ea8dc4b6Seschrock * For the arc callback, we will usually see: 1503744947dcSTom Erickson * dbuf_do_evict()->dbuf_clear();dbuf_destroy() 1504ea8dc4b6Seschrock * Sometimes, though, we will get a mix of these two: 1505ea8dc4b6Seschrock * DMU: dbuf_clear()->arc_buf_evict() 1506ea8dc4b6Seschrock * ARC: dbuf_do_evict()->dbuf_destroy() 1507ea8dc4b6Seschrock */ 1508ea8dc4b6Seschrock void 1509fa9e4066Sahrens dbuf_clear(dmu_buf_impl_t *db) 1510fa9e4066Sahrens { 1511744947dcSTom Erickson dnode_t *dn; 1512ea8dc4b6Seschrock dmu_buf_impl_t *parent = db->db_parent; 1513744947dcSTom Erickson dmu_buf_impl_t *dndb; 1514ea8dc4b6Seschrock int dbuf_gone = FALSE; 1515fa9e4066Sahrens 1516fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 1517fa9e4066Sahrens ASSERT(refcount_is_zero(&db->db_holds)); 1518fa9e4066Sahrens 1519ea8dc4b6Seschrock dbuf_evict_user(db); 1520ea8dc4b6Seschrock 1521fa9e4066Sahrens if (db->db_state == DB_CACHED) { 1522ea8dc4b6Seschrock ASSERT(db->db.db_data != NULL); 15230a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 1524ea8dc4b6Seschrock zio_buf_free(db->db.db_data, DN_MAX_BONUSLEN); 15255a98e54bSBrendan Gregg - Sun Microsystems arc_space_return(DN_MAX_BONUSLEN, ARC_SPACE_OTHER); 15260e8c6158Smaybee } 1527fa9e4066Sahrens db->db.db_data = NULL; 1528fa9e4066Sahrens db->db_state = DB_UNCACHED; 1529fa9e4066Sahrens } 1530fa9e4066Sahrens 153182c9918fSTim Haley ASSERT(db->db_state == DB_UNCACHED || db->db_state == DB_NOFILL); 1532fa9e4066Sahrens ASSERT(db->db_data_pending == NULL); 1533fa9e4066Sahrens 1534ea8dc4b6Seschrock db->db_state = DB_EVICTING; 1535ea8dc4b6Seschrock db->db_blkptr = NULL; 1536ea8dc4b6Seschrock 1537744947dcSTom Erickson DB_DNODE_ENTER(db); 1538744947dcSTom Erickson dn = DB_DNODE(db); 1539744947dcSTom Erickson dndb = dn->dn_dbuf; 15400a586ceaSMark Shellenbaum if (db->db_blkid != DMU_BONUS_BLKID && MUTEX_HELD(&dn->dn_dbufs_mtx)) { 1541ea8dc4b6Seschrock list_remove(&dn->dn_dbufs, db); 1542744947dcSTom Erickson (void) atomic_dec_32_nv(&dn->dn_dbufs_count); 1543744947dcSTom Erickson membar_producer(); 1544744947dcSTom Erickson DB_DNODE_EXIT(db); 1545744947dcSTom Erickson /* 1546744947dcSTom Erickson * Decrementing the dbuf count means that the hold corresponding 1547744947dcSTom Erickson * to the removed dbuf is no longer discounted in dnode_move(), 1548744947dcSTom Erickson * so the dnode cannot be moved until after we release the hold. 1549744947dcSTom Erickson * The membar_producer() ensures visibility of the decremented 1550744947dcSTom Erickson * value in dnode_move(), since DB_DNODE_EXIT doesn't actually 1551744947dcSTom Erickson * release any lock. 1552744947dcSTom Erickson */ 1553ea8dc4b6Seschrock dnode_rele(dn, db); 1554744947dcSTom Erickson db->db_dnode_handle = NULL; 1555744947dcSTom Erickson } else { 1556744947dcSTom Erickson DB_DNODE_EXIT(db); 1557ea8dc4b6Seschrock } 1558ea8dc4b6Seschrock 1559ea8dc4b6Seschrock if (db->db_buf) 1560ea8dc4b6Seschrock dbuf_gone = arc_buf_evict(db->db_buf); 1561ea8dc4b6Seschrock 1562ea8dc4b6Seschrock if (!dbuf_gone) 1563ea8dc4b6Seschrock mutex_exit(&db->db_mtx); 1564fa9e4066Sahrens 1565fa9e4066Sahrens /* 1566744947dcSTom Erickson * If this dbuf is referenced from an indirect dbuf, 1567fa9e4066Sahrens * decrement the ref count on the indirect dbuf. 1568fa9e4066Sahrens */ 1569c543ec06Sahrens if (parent && parent != dndb) 1570ea8dc4b6Seschrock dbuf_rele(parent, db); 1571fa9e4066Sahrens } 1572fa9e4066Sahrens 1573fa9e4066Sahrens static int 1574fa9e4066Sahrens dbuf_findbp(dnode_t *dn, int level, uint64_t blkid, int fail_sparse, 1575fa9e4066Sahrens dmu_buf_impl_t **parentp, blkptr_t **bpp) 1576fa9e4066Sahrens { 1577fa9e4066Sahrens int nlevels, epbs; 1578fa9e4066Sahrens 15790b69c2f0Sahrens *parentp = NULL; 15800b69c2f0Sahrens *bpp = NULL; 15810b69c2f0Sahrens 15820a586ceaSMark Shellenbaum ASSERT(blkid != DMU_BONUS_BLKID); 15830a586ceaSMark Shellenbaum 15840a586ceaSMark Shellenbaum if (blkid == DMU_SPILL_BLKID) { 15850a586ceaSMark Shellenbaum mutex_enter(&dn->dn_mtx); 158606e0070dSMark Shellenbaum if (dn->dn_have_spill && 158706e0070dSMark Shellenbaum (dn->dn_phys->dn_flags & DNODE_FLAG_SPILL_BLKPTR)) 15880a586ceaSMark Shellenbaum *bpp = &dn->dn_phys->dn_spill; 15890a586ceaSMark Shellenbaum else 15900a586ceaSMark Shellenbaum *bpp = NULL; 15910a586ceaSMark Shellenbaum dbuf_add_ref(dn->dn_dbuf, NULL); 15920a586ceaSMark Shellenbaum *parentp = dn->dn_dbuf; 15930a586ceaSMark Shellenbaum mutex_exit(&dn->dn_mtx); 15940a586ceaSMark Shellenbaum return (0); 15950a586ceaSMark Shellenbaum } 1596ea8dc4b6Seschrock 1597fa9e4066Sahrens if (dn->dn_phys->dn_nlevels == 0) 1598fa9e4066Sahrens nlevels = 1; 1599fa9e4066Sahrens else 1600fa9e4066Sahrens nlevels = dn->dn_phys->dn_nlevels; 1601fa9e4066Sahrens 1602fa9e4066Sahrens epbs = dn->dn_indblkshift - SPA_BLKPTRSHIFT; 1603fa9e4066Sahrens 1604fa9e4066Sahrens ASSERT3U(level * epbs, <, 64); 1605fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 1606ea8dc4b6Seschrock if (level >= nlevels || 1607fa9e4066Sahrens (blkid > (dn->dn_phys->dn_maxblkid >> (level * epbs)))) { 1608fa9e4066Sahrens /* the buffer has no parent yet */ 1609be6fd75aSMatthew Ahrens return (SET_ERROR(ENOENT)); 1610fa9e4066Sahrens } else if (level < nlevels-1) { 1611fa9e4066Sahrens /* this block is referenced from an indirect block */ 1612fa9e4066Sahrens int err = dbuf_hold_impl(dn, level+1, 1613fa9e4066Sahrens blkid >> epbs, fail_sparse, NULL, parentp); 1614fa9e4066Sahrens if (err) 1615fa9e4066Sahrens return (err); 1616ea8dc4b6Seschrock err = dbuf_read(*parentp, NULL, 1617ea8dc4b6Seschrock (DB_RF_HAVESTRUCT | DB_RF_NOPREFETCH | DB_RF_CANFAIL)); 1618c543ec06Sahrens if (err) { 1619c543ec06Sahrens dbuf_rele(*parentp, NULL); 1620c543ec06Sahrens *parentp = NULL; 1621c543ec06Sahrens return (err); 1622ea8dc4b6Seschrock } 1623c543ec06Sahrens *bpp = ((blkptr_t *)(*parentp)->db.db_data) + 1624c543ec06Sahrens (blkid & ((1ULL << epbs) - 1)); 1625c543ec06Sahrens return (0); 1626fa9e4066Sahrens } else { 1627fa9e4066Sahrens /* the block is referenced from the dnode */ 1628fa9e4066Sahrens ASSERT3U(level, ==, nlevels-1); 1629fa9e4066Sahrens ASSERT(dn->dn_phys->dn_nblkptr == 0 || 1630fa9e4066Sahrens blkid < dn->dn_phys->dn_nblkptr); 1631c543ec06Sahrens if (dn->dn_dbuf) { 1632c543ec06Sahrens dbuf_add_ref(dn->dn_dbuf, NULL); 1633c543ec06Sahrens *parentp = dn->dn_dbuf; 1634c543ec06Sahrens } 1635fa9e4066Sahrens *bpp = &dn->dn_phys->dn_blkptr[blkid]; 1636fa9e4066Sahrens return (0); 1637fa9e4066Sahrens } 1638fa9e4066Sahrens } 1639fa9e4066Sahrens 1640fa9e4066Sahrens static dmu_buf_impl_t * 1641fa9e4066Sahrens dbuf_create(dnode_t *dn, uint8_t level, uint64_t blkid, 1642fa9e4066Sahrens dmu_buf_impl_t *parent, blkptr_t *blkptr) 1643fa9e4066Sahrens { 1644503ad85cSMatthew Ahrens objset_t *os = dn->dn_objset; 1645fa9e4066Sahrens dmu_buf_impl_t *db, *odb; 1646fa9e4066Sahrens 1647fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 1648fa9e4066Sahrens ASSERT(dn->dn_type != DMU_OT_NONE); 1649fa9e4066Sahrens 1650fa9e4066Sahrens db = kmem_cache_alloc(dbuf_cache, KM_SLEEP); 1651fa9e4066Sahrens 1652fa9e4066Sahrens db->db_objset = os; 1653fa9e4066Sahrens db->db.db_object = dn->dn_object; 1654fa9e4066Sahrens db->db_level = level; 1655fa9e4066Sahrens db->db_blkid = blkid; 1656c717a561Smaybee db->db_last_dirty = NULL; 1657ea8dc4b6Seschrock db->db_dirtycnt = 0; 1658744947dcSTom Erickson db->db_dnode_handle = dn->dn_handle; 1659ea8dc4b6Seschrock db->db_parent = parent; 1660ea8dc4b6Seschrock db->db_blkptr = blkptr; 1661fa9e4066Sahrens 1662c717a561Smaybee db->db_user_ptr = NULL; 1663c717a561Smaybee db->db_user_data_ptr_ptr = NULL; 1664c717a561Smaybee db->db_evict_func = NULL; 1665c717a561Smaybee db->db_immediate_evict = 0; 1666c717a561Smaybee db->db_freed_in_flight = 0; 1667ea8dc4b6Seschrock 16680a586ceaSMark Shellenbaum if (blkid == DMU_BONUS_BLKID) { 1669ea8dc4b6Seschrock ASSERT3P(parent, ==, dn->dn_dbuf); 16701934e92fSmaybee db->db.db_size = DN_MAX_BONUSLEN - 16711934e92fSmaybee (dn->dn_nblkptr-1) * sizeof (blkptr_t); 16721934e92fSmaybee ASSERT3U(db->db.db_size, >=, dn->dn_bonuslen); 16730a586ceaSMark Shellenbaum db->db.db_offset = DMU_BONUS_BLKID; 1674ea8dc4b6Seschrock db->db_state = DB_UNCACHED; 1675ea8dc4b6Seschrock /* the bonus dbuf is not placed in the hash table */ 16765a98e54bSBrendan Gregg - Sun Microsystems arc_space_consume(sizeof (dmu_buf_impl_t), ARC_SPACE_OTHER); 1677ea8dc4b6Seschrock return (db); 16780a586ceaSMark Shellenbaum } else if (blkid == DMU_SPILL_BLKID) { 16790a586ceaSMark Shellenbaum db->db.db_size = (blkptr != NULL) ? 16800a586ceaSMark Shellenbaum BP_GET_LSIZE(blkptr) : SPA_MINBLOCKSIZE; 16810a586ceaSMark Shellenbaum db->db.db_offset = 0; 1682fa9e4066Sahrens } else { 1683fa9e4066Sahrens int blocksize = 1684fa9e4066Sahrens db->db_level ? 1<<dn->dn_indblkshift : dn->dn_datablksz; 1685fa9e4066Sahrens db->db.db_size = blocksize; 1686fa9e4066Sahrens db->db.db_offset = db->db_blkid * blocksize; 1687fa9e4066Sahrens } 1688fa9e4066Sahrens 1689fa9e4066Sahrens /* 1690fa9e4066Sahrens * Hold the dn_dbufs_mtx while we get the new dbuf 1691fa9e4066Sahrens * in the hash table *and* added to the dbufs list. 1692fa9e4066Sahrens * This prevents a possible deadlock with someone 1693fa9e4066Sahrens * trying to look up this dbuf before its added to the 1694fa9e4066Sahrens * dn_dbufs list. 1695fa9e4066Sahrens */ 1696fa9e4066Sahrens mutex_enter(&dn->dn_dbufs_mtx); 1697ea8dc4b6Seschrock db->db_state = DB_EVICTING; 1698fa9e4066Sahrens if ((odb = dbuf_hash_insert(db)) != NULL) { 1699fa9e4066Sahrens /* someone else inserted it first */ 1700fa9e4066Sahrens kmem_cache_free(dbuf_cache, db); 1701fa9e4066Sahrens mutex_exit(&dn->dn_dbufs_mtx); 1702fa9e4066Sahrens return (odb); 1703fa9e4066Sahrens } 1704fa9e4066Sahrens list_insert_head(&dn->dn_dbufs, db); 1705ea8dc4b6Seschrock db->db_state = DB_UNCACHED; 1706fa9e4066Sahrens mutex_exit(&dn->dn_dbufs_mtx); 17075a98e54bSBrendan Gregg - Sun Microsystems arc_space_consume(sizeof (dmu_buf_impl_t), ARC_SPACE_OTHER); 1708fa9e4066Sahrens 1709fa9e4066Sahrens if (parent && parent != dn->dn_dbuf) 1710fa9e4066Sahrens dbuf_add_ref(parent, db); 1711fa9e4066Sahrens 1712ea8dc4b6Seschrock ASSERT(dn->dn_object == DMU_META_DNODE_OBJECT || 1713ea8dc4b6Seschrock refcount_count(&dn->dn_holds) > 0); 1714fa9e4066Sahrens (void) refcount_add(&dn->dn_holds, db); 1715744947dcSTom Erickson (void) atomic_inc_32_nv(&dn->dn_dbufs_count); 1716fa9e4066Sahrens 1717fa9e4066Sahrens dprintf_dbuf(db, "db=%p\n", db); 1718fa9e4066Sahrens 1719fa9e4066Sahrens return (db); 1720fa9e4066Sahrens } 1721fa9e4066Sahrens 1722fa9e4066Sahrens static int 1723ea8dc4b6Seschrock dbuf_do_evict(void *private) 1724fa9e4066Sahrens { 1725ea8dc4b6Seschrock arc_buf_t *buf = private; 1726ea8dc4b6Seschrock dmu_buf_impl_t *db = buf->b_private; 1727fa9e4066Sahrens 1728ea8dc4b6Seschrock if (!MUTEX_HELD(&db->db_mtx)) 1729ea8dc4b6Seschrock mutex_enter(&db->db_mtx); 1730fa9e4066Sahrens 1731ea8dc4b6Seschrock ASSERT(refcount_is_zero(&db->db_holds)); 1732fa9e4066Sahrens 1733ea8dc4b6Seschrock if (db->db_state != DB_EVICTING) { 1734ea8dc4b6Seschrock ASSERT(db->db_state == DB_CACHED); 1735ea8dc4b6Seschrock DBUF_VERIFY(db); 1736ea8dc4b6Seschrock db->db_buf = NULL; 1737ea8dc4b6Seschrock dbuf_evict(db); 1738ea8dc4b6Seschrock } else { 1739ea8dc4b6Seschrock mutex_exit(&db->db_mtx); 1740ea8dc4b6Seschrock dbuf_destroy(db); 1741fa9e4066Sahrens } 1742ea8dc4b6Seschrock return (0); 1743fa9e4066Sahrens } 1744fa9e4066Sahrens 1745fa9e4066Sahrens static void 1746fa9e4066Sahrens dbuf_destroy(dmu_buf_impl_t *db) 1747fa9e4066Sahrens { 1748fa9e4066Sahrens ASSERT(refcount_is_zero(&db->db_holds)); 1749fa9e4066Sahrens 17500a586ceaSMark Shellenbaum if (db->db_blkid != DMU_BONUS_BLKID) { 1751ea8dc4b6Seschrock /* 1752ea8dc4b6Seschrock * If this dbuf is still on the dn_dbufs list, 1753ea8dc4b6Seschrock * remove it from that list. 1754ea8dc4b6Seschrock */ 1755744947dcSTom Erickson if (db->db_dnode_handle != NULL) { 1756744947dcSTom Erickson dnode_t *dn; 17571934e92fSmaybee 1758744947dcSTom Erickson DB_DNODE_ENTER(db); 1759744947dcSTom Erickson dn = DB_DNODE(db); 17601934e92fSmaybee mutex_enter(&dn->dn_dbufs_mtx); 1761ea8dc4b6Seschrock list_remove(&dn->dn_dbufs, db); 1762744947dcSTom Erickson (void) atomic_dec_32_nv(&dn->dn_dbufs_count); 1763c543ec06Sahrens mutex_exit(&dn->dn_dbufs_mtx); 1764744947dcSTom Erickson DB_DNODE_EXIT(db); 1765744947dcSTom Erickson /* 1766744947dcSTom Erickson * Decrementing the dbuf count means that the hold 1767744947dcSTom Erickson * corresponding to the removed dbuf is no longer 1768744947dcSTom Erickson * discounted in dnode_move(), so the dnode cannot be 1769744947dcSTom Erickson * moved until after we release the hold. 1770744947dcSTom Erickson */ 1771ea8dc4b6Seschrock dnode_rele(dn, db); 1772744947dcSTom Erickson db->db_dnode_handle = NULL; 1773ea8dc4b6Seschrock } 1774ea8dc4b6Seschrock dbuf_hash_remove(db); 1775ea8dc4b6Seschrock } 1776ea8dc4b6Seschrock db->db_parent = NULL; 1777ea8dc4b6Seschrock db->db_buf = NULL; 1778ea8dc4b6Seschrock 1779f82bfe17Sgw ASSERT(!list_link_active(&db->db_link)); 1780fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 1781fa9e4066Sahrens ASSERT(db->db_hash_next == NULL); 1782fa9e4066Sahrens ASSERT(db->db_blkptr == NULL); 1783fa9e4066Sahrens ASSERT(db->db_data_pending == NULL); 1784fa9e4066Sahrens 1785fa9e4066Sahrens kmem_cache_free(dbuf_cache, db); 17865a98e54bSBrendan Gregg - Sun Microsystems arc_space_return(sizeof (dmu_buf_impl_t), ARC_SPACE_OTHER); 1787fa9e4066Sahrens } 1788fa9e4066Sahrens 1789fa9e4066Sahrens void 1790fa9e4066Sahrens dbuf_prefetch(dnode_t *dn, uint64_t blkid) 1791fa9e4066Sahrens { 179213506d1eSmaybee dmu_buf_impl_t *db = NULL; 1793fa9e4066Sahrens blkptr_t *bp = NULL; 1794fa9e4066Sahrens 17950a586ceaSMark Shellenbaum ASSERT(blkid != DMU_BONUS_BLKID); 1796fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 1797fa9e4066Sahrens 1798fa9e4066Sahrens if (dnode_block_freed(dn, blkid)) 1799fa9e4066Sahrens return; 1800fa9e4066Sahrens 1801fa9e4066Sahrens /* dbuf_find() returns with db_mtx held */ 1802fa9e4066Sahrens if (db = dbuf_find(dn, 0, blkid)) { 18039e9c486fSGeorge Wilson /* 18049e9c486fSGeorge Wilson * This dbuf is already in the cache. We assume that 18059e9c486fSGeorge Wilson * it is already CACHED, or else about to be either 18069e9c486fSGeorge Wilson * read or filled. 18079e9c486fSGeorge Wilson */ 1808fa9e4066Sahrens mutex_exit(&db->db_mtx); 18099e9c486fSGeorge Wilson return; 1810fa9e4066Sahrens } 1811fa9e4066Sahrens 181213506d1eSmaybee if (dbuf_findbp(dn, 0, blkid, TRUE, &db, &bp) == 0) { 1813fa9e4066Sahrens if (bp && !BP_IS_HOLE(bp)) { 1814c7cd2421SGeorge Wilson int priority = dn->dn_type == DMU_OT_DDT_ZAP ? 1815c7cd2421SGeorge Wilson ZIO_PRIORITY_DDT_PREFETCH : ZIO_PRIORITY_ASYNC_READ; 1816b24ab676SJeff Bonwick dsl_dataset_t *ds = dn->dn_objset->os_dsl_dataset; 181713506d1eSmaybee uint32_t aflags = ARC_NOWAIT | ARC_PREFETCH; 1818ea8dc4b6Seschrock zbookmark_t zb; 1819b24ab676SJeff Bonwick 1820b24ab676SJeff Bonwick SET_BOOKMARK(&zb, ds ? ds->ds_object : DMU_META_OBJSET, 1821b24ab676SJeff Bonwick dn->dn_object, 0, blkid); 1822ea8dc4b6Seschrock 18231b912ec7SGeorge Wilson (void) arc_read(NULL, dn->dn_objset->os_spa, 18241b912ec7SGeorge Wilson bp, NULL, NULL, priority, 1825fa9e4066Sahrens ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE, 182613506d1eSmaybee &aflags, &zb); 1827fa9e4066Sahrens } 182813506d1eSmaybee if (db) 182913506d1eSmaybee dbuf_rele(db, NULL); 1830fa9e4066Sahrens } 1831fa9e4066Sahrens } 1832fa9e4066Sahrens 1833fa9e4066Sahrens /* 1834fa9e4066Sahrens * Returns with db_holds incremented, and db_mtx not held. 1835fa9e4066Sahrens * Note: dn_struct_rwlock must be held. 1836fa9e4066Sahrens */ 1837fa9e4066Sahrens int 1838fa9e4066Sahrens dbuf_hold_impl(dnode_t *dn, uint8_t level, uint64_t blkid, int fail_sparse, 1839fa9e4066Sahrens void *tag, dmu_buf_impl_t **dbp) 1840fa9e4066Sahrens { 1841fa9e4066Sahrens dmu_buf_impl_t *db, *parent = NULL; 1842fa9e4066Sahrens 18430a586ceaSMark Shellenbaum ASSERT(blkid != DMU_BONUS_BLKID); 1844fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 1845fa9e4066Sahrens ASSERT3U(dn->dn_nlevels, >, level); 1846fa9e4066Sahrens 1847fa9e4066Sahrens *dbp = NULL; 1848ea8dc4b6Seschrock top: 1849fa9e4066Sahrens /* dbuf_find() returns with db_mtx held */ 1850fa9e4066Sahrens db = dbuf_find(dn, level, blkid); 1851fa9e4066Sahrens 1852fa9e4066Sahrens if (db == NULL) { 1853fa9e4066Sahrens blkptr_t *bp = NULL; 1854fa9e4066Sahrens int err; 1855fa9e4066Sahrens 1856c543ec06Sahrens ASSERT3P(parent, ==, NULL); 1857fa9e4066Sahrens err = dbuf_findbp(dn, level, blkid, fail_sparse, &parent, &bp); 1858fa9e4066Sahrens if (fail_sparse) { 1859fa9e4066Sahrens if (err == 0 && bp && BP_IS_HOLE(bp)) 1860be6fd75aSMatthew Ahrens err = SET_ERROR(ENOENT); 1861fa9e4066Sahrens if (err) { 1862c543ec06Sahrens if (parent) 1863ea8dc4b6Seschrock dbuf_rele(parent, NULL); 1864fa9e4066Sahrens return (err); 1865fa9e4066Sahrens } 1866fa9e4066Sahrens } 1867ea8dc4b6Seschrock if (err && err != ENOENT) 1868ea8dc4b6Seschrock return (err); 1869fa9e4066Sahrens db = dbuf_create(dn, level, blkid, parent, bp); 1870fa9e4066Sahrens } 1871fa9e4066Sahrens 1872ea8dc4b6Seschrock if (db->db_buf && refcount_is_zero(&db->db_holds)) { 1873ea8dc4b6Seschrock arc_buf_add_ref(db->db_buf, db); 1874ea8dc4b6Seschrock if (db->db_buf->b_data == NULL) { 1875ea8dc4b6Seschrock dbuf_clear(db); 1876c543ec06Sahrens if (parent) { 1877c543ec06Sahrens dbuf_rele(parent, NULL); 1878c543ec06Sahrens parent = NULL; 1879c543ec06Sahrens } 1880ea8dc4b6Seschrock goto top; 1881ea8dc4b6Seschrock } 1882ea8dc4b6Seschrock ASSERT3P(db->db.db_data, ==, db->db_buf->b_data); 1883ea8dc4b6Seschrock } 1884ea8dc4b6Seschrock 1885ea8dc4b6Seschrock ASSERT(db->db_buf == NULL || arc_referenced(db->db_buf)); 1886ea8dc4b6Seschrock 1887fa9e4066Sahrens /* 1888c717a561Smaybee * If this buffer is currently syncing out, and we are are 1889c717a561Smaybee * still referencing it from db_data, we need to make a copy 1890c717a561Smaybee * of it in case we decide we want to dirty it again in this txg. 1891fa9e4066Sahrens */ 18920a586ceaSMark Shellenbaum if (db->db_level == 0 && db->db_blkid != DMU_BONUS_BLKID && 1893ea8dc4b6Seschrock dn->dn_object != DMU_META_DNODE_OBJECT && 1894c717a561Smaybee db->db_state == DB_CACHED && db->db_data_pending) { 1895c717a561Smaybee dbuf_dirty_record_t *dr = db->db_data_pending; 1896fa9e4066Sahrens 1897c717a561Smaybee if (dr->dt.dl.dr_data == db->db_buf) { 1898c717a561Smaybee arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 1899c717a561Smaybee 1900c717a561Smaybee dbuf_set_data(db, 1901744947dcSTom Erickson arc_buf_alloc(dn->dn_objset->os_spa, 1902c717a561Smaybee db->db.db_size, db, type)); 1903c717a561Smaybee bcopy(dr->dt.dl.dr_data->b_data, db->db.db_data, 1904c717a561Smaybee db->db.db_size); 1905c717a561Smaybee } 1906fa9e4066Sahrens } 1907fa9e4066Sahrens 1908ea8dc4b6Seschrock (void) refcount_add(&db->db_holds, tag); 1909fa9e4066Sahrens dbuf_update_data(db); 19109c9dc39aSek DBUF_VERIFY(db); 1911fa9e4066Sahrens mutex_exit(&db->db_mtx); 1912fa9e4066Sahrens 1913fa9e4066Sahrens /* NOTE: we can't rele the parent until after we drop the db_mtx */ 1914c543ec06Sahrens if (parent) 1915ea8dc4b6Seschrock dbuf_rele(parent, NULL); 1916fa9e4066Sahrens 1917744947dcSTom Erickson ASSERT3P(DB_DNODE(db), ==, dn); 1918fa9e4066Sahrens ASSERT3U(db->db_blkid, ==, blkid); 1919fa9e4066Sahrens ASSERT3U(db->db_level, ==, level); 1920fa9e4066Sahrens *dbp = db; 1921fa9e4066Sahrens 1922fa9e4066Sahrens return (0); 1923fa9e4066Sahrens } 1924fa9e4066Sahrens 1925fa9e4066Sahrens dmu_buf_impl_t * 1926ea8dc4b6Seschrock dbuf_hold(dnode_t *dn, uint64_t blkid, void *tag) 1927fa9e4066Sahrens { 1928fa9e4066Sahrens dmu_buf_impl_t *db; 1929ea8dc4b6Seschrock int err = dbuf_hold_impl(dn, 0, blkid, FALSE, tag, &db); 1930ea8dc4b6Seschrock return (err ? NULL : db); 1931fa9e4066Sahrens } 1932fa9e4066Sahrens 1933fa9e4066Sahrens dmu_buf_impl_t * 1934fa9e4066Sahrens dbuf_hold_level(dnode_t *dn, int level, uint64_t blkid, void *tag) 1935fa9e4066Sahrens { 1936fa9e4066Sahrens dmu_buf_impl_t *db; 1937ea8dc4b6Seschrock int err = dbuf_hold_impl(dn, level, blkid, FALSE, tag, &db); 1938ea8dc4b6Seschrock return (err ? NULL : db); 1939fa9e4066Sahrens } 1940fa9e4066Sahrens 19411934e92fSmaybee void 1942ea8dc4b6Seschrock dbuf_create_bonus(dnode_t *dn) 1943fa9e4066Sahrens { 1944ea8dc4b6Seschrock ASSERT(RW_WRITE_HELD(&dn->dn_struct_rwlock)); 1945ea8dc4b6Seschrock 1946ea8dc4b6Seschrock ASSERT(dn->dn_bonus == NULL); 19470a586ceaSMark Shellenbaum dn->dn_bonus = dbuf_create(dn, 0, DMU_BONUS_BLKID, dn->dn_dbuf, NULL); 19480a586ceaSMark Shellenbaum } 19490a586ceaSMark Shellenbaum 19500a586ceaSMark Shellenbaum int 19510a586ceaSMark Shellenbaum dbuf_spill_set_blksz(dmu_buf_t *db_fake, uint64_t blksz, dmu_tx_t *tx) 19520a586ceaSMark Shellenbaum { 19530a586ceaSMark Shellenbaum dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 1954744947dcSTom Erickson dnode_t *dn; 1955744947dcSTom Erickson 19560a586ceaSMark Shellenbaum if (db->db_blkid != DMU_SPILL_BLKID) 1957be6fd75aSMatthew Ahrens return (SET_ERROR(ENOTSUP)); 19580a586ceaSMark Shellenbaum if (blksz == 0) 19590a586ceaSMark Shellenbaum blksz = SPA_MINBLOCKSIZE; 19600a586ceaSMark Shellenbaum if (blksz > SPA_MAXBLOCKSIZE) 19610a586ceaSMark Shellenbaum blksz = SPA_MAXBLOCKSIZE; 19620a586ceaSMark Shellenbaum else 19630a586ceaSMark Shellenbaum blksz = P2ROUNDUP(blksz, SPA_MINBLOCKSIZE); 19640a586ceaSMark Shellenbaum 1965744947dcSTom Erickson DB_DNODE_ENTER(db); 1966744947dcSTom Erickson dn = DB_DNODE(db); 1967744947dcSTom Erickson rw_enter(&dn->dn_struct_rwlock, RW_WRITER); 19680a586ceaSMark Shellenbaum dbuf_new_size(db, blksz, tx); 1969744947dcSTom Erickson rw_exit(&dn->dn_struct_rwlock); 1970744947dcSTom Erickson DB_DNODE_EXIT(db); 19710a586ceaSMark Shellenbaum 19720a586ceaSMark Shellenbaum return (0); 19730a586ceaSMark Shellenbaum } 19740a586ceaSMark Shellenbaum 19750a586ceaSMark Shellenbaum void 19760a586ceaSMark Shellenbaum dbuf_rm_spill(dnode_t *dn, dmu_tx_t *tx) 19770a586ceaSMark Shellenbaum { 19780a586ceaSMark Shellenbaum dbuf_free_range(dn, DMU_SPILL_BLKID, DMU_SPILL_BLKID, tx); 1979fa9e4066Sahrens } 1980fa9e4066Sahrens 1981ea8dc4b6Seschrock #pragma weak dmu_buf_add_ref = dbuf_add_ref 1982fa9e4066Sahrens void 1983fa9e4066Sahrens dbuf_add_ref(dmu_buf_impl_t *db, void *tag) 1984fa9e4066Sahrens { 1985ea8dc4b6Seschrock int64_t holds = refcount_add(&db->db_holds, tag); 1986ea8dc4b6Seschrock ASSERT(holds > 1); 1987fa9e4066Sahrens } 1988fa9e4066Sahrens 1989744947dcSTom Erickson /* 1990744947dcSTom Erickson * If you call dbuf_rele() you had better not be referencing the dnode handle 1991744947dcSTom Erickson * unless you have some other direct or indirect hold on the dnode. (An indirect 1992744947dcSTom Erickson * hold is a hold on one of the dnode's dbufs, including the bonus buffer.) 1993744947dcSTom Erickson * Without that, the dbuf_rele() could lead to a dnode_rele() followed by the 1994744947dcSTom Erickson * dnode's parent dbuf evicting its dnode handles. 1995744947dcSTom Erickson */ 1996ea8dc4b6Seschrock #pragma weak dmu_buf_rele = dbuf_rele 1997fa9e4066Sahrens void 1998ea8dc4b6Seschrock dbuf_rele(dmu_buf_impl_t *db, void *tag) 1999b24ab676SJeff Bonwick { 2000b24ab676SJeff Bonwick mutex_enter(&db->db_mtx); 2001b24ab676SJeff Bonwick dbuf_rele_and_unlock(db, tag); 2002b24ab676SJeff Bonwick } 2003b24ab676SJeff Bonwick 2004b24ab676SJeff Bonwick /* 2005b24ab676SJeff Bonwick * dbuf_rele() for an already-locked dbuf. This is necessary to allow 2006b24ab676SJeff Bonwick * db_dirtycnt and db_holds to be updated atomically. 2007b24ab676SJeff Bonwick */ 2008b24ab676SJeff Bonwick void 2009b24ab676SJeff Bonwick dbuf_rele_and_unlock(dmu_buf_impl_t *db, void *tag) 2010fa9e4066Sahrens { 2011fa9e4066Sahrens int64_t holds; 2012fa9e4066Sahrens 2013b24ab676SJeff Bonwick ASSERT(MUTEX_HELD(&db->db_mtx)); 20149c9dc39aSek DBUF_VERIFY(db); 2015fa9e4066Sahrens 2016744947dcSTom Erickson /* 2017744947dcSTom Erickson * Remove the reference to the dbuf before removing its hold on the 2018744947dcSTom Erickson * dnode so we can guarantee in dnode_move() that a referenced bonus 2019744947dcSTom Erickson * buffer has a corresponding dnode hold. 2020744947dcSTom Erickson */ 2021fa9e4066Sahrens holds = refcount_remove(&db->db_holds, tag); 2022ea8dc4b6Seschrock ASSERT(holds >= 0); 2023ea8dc4b6Seschrock 2024c717a561Smaybee /* 2025c717a561Smaybee * We can't freeze indirects if there is a possibility that they 2026c717a561Smaybee * may be modified in the current syncing context. 2027c717a561Smaybee */ 2028c717a561Smaybee if (db->db_buf && holds == (db->db_level == 0 ? db->db_dirtycnt : 0)) 20296b4acc8bSahrens arc_buf_freeze(db->db_buf); 20306b4acc8bSahrens 2031ea8dc4b6Seschrock if (holds == db->db_dirtycnt && 2032c717a561Smaybee db->db_level == 0 && db->db_immediate_evict) 2033ea8dc4b6Seschrock dbuf_evict_user(db); 2034fa9e4066Sahrens 2035fa9e4066Sahrens if (holds == 0) { 20360a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 2037ea8dc4b6Seschrock mutex_exit(&db->db_mtx); 2038744947dcSTom Erickson 2039744947dcSTom Erickson /* 2040744947dcSTom Erickson * If the dnode moves here, we cannot cross this barrier 2041744947dcSTom Erickson * until the move completes. 2042744947dcSTom Erickson */ 2043744947dcSTom Erickson DB_DNODE_ENTER(db); 2044744947dcSTom Erickson (void) atomic_dec_32_nv(&DB_DNODE(db)->dn_dbufs_count); 2045744947dcSTom Erickson DB_DNODE_EXIT(db); 2046744947dcSTom Erickson /* 2047744947dcSTom Erickson * The bonus buffer's dnode hold is no longer discounted 2048744947dcSTom Erickson * in dnode_move(). The dnode cannot move until after 2049744947dcSTom Erickson * the dnode_rele(). 2050744947dcSTom Erickson */ 2051744947dcSTom Erickson dnode_rele(DB_DNODE(db), db); 2052ea8dc4b6Seschrock } else if (db->db_buf == NULL) { 2053ea8dc4b6Seschrock /* 2054ea8dc4b6Seschrock * This is a special case: we never associated this 2055ea8dc4b6Seschrock * dbuf with any data allocated from the ARC. 2056ea8dc4b6Seschrock */ 205782c9918fSTim Haley ASSERT(db->db_state == DB_UNCACHED || 205882c9918fSTim Haley db->db_state == DB_NOFILL); 2059ea8dc4b6Seschrock dbuf_evict(db); 20606b4acc8bSahrens } else if (arc_released(db->db_buf)) { 2061ea8dc4b6Seschrock arc_buf_t *buf = db->db_buf; 2062ea8dc4b6Seschrock /* 2063ea8dc4b6Seschrock * This dbuf has anonymous data associated with it. 2064ea8dc4b6Seschrock */ 2065ea8dc4b6Seschrock dbuf_set_data(db, NULL); 20663b2aab18SMatthew Ahrens VERIFY(arc_buf_remove_ref(buf, db)); 2067ea8dc4b6Seschrock dbuf_evict(db); 2068ea8dc4b6Seschrock } else { 20693b2aab18SMatthew Ahrens VERIFY(!arc_buf_remove_ref(db->db_buf, db)); 20709253d63dSGeorge Wilson 20719253d63dSGeorge Wilson /* 20729253d63dSGeorge Wilson * A dbuf will be eligible for eviction if either the 20739253d63dSGeorge Wilson * 'primarycache' property is set or a duplicate 20749253d63dSGeorge Wilson * copy of this buffer is already cached in the arc. 20759253d63dSGeorge Wilson * 20769253d63dSGeorge Wilson * In the case of the 'primarycache' a buffer 20779253d63dSGeorge Wilson * is considered for eviction if it matches the 20789253d63dSGeorge Wilson * criteria set in the property. 20799253d63dSGeorge Wilson * 20809253d63dSGeorge Wilson * To decide if our buffer is considered a 20819253d63dSGeorge Wilson * duplicate, we must call into the arc to determine 20829253d63dSGeorge Wilson * if multiple buffers are referencing the same 20839253d63dSGeorge Wilson * block on-disk. If so, then we simply evict 20849253d63dSGeorge Wilson * ourselves. 20859253d63dSGeorge Wilson */ 20869253d63dSGeorge Wilson if (!DBUF_IS_CACHEABLE(db) || 20879253d63dSGeorge Wilson arc_buf_eviction_needed(db->db_buf)) 20883baa08fcSek dbuf_clear(db); 20893baa08fcSek else 20903baa08fcSek mutex_exit(&db->db_mtx); 2091ea8dc4b6Seschrock } 2092fa9e4066Sahrens } else { 2093fa9e4066Sahrens mutex_exit(&db->db_mtx); 2094fa9e4066Sahrens } 2095fa9e4066Sahrens } 2096fa9e4066Sahrens 2097fa9e4066Sahrens #pragma weak dmu_buf_refcount = dbuf_refcount 2098fa9e4066Sahrens uint64_t 2099fa9e4066Sahrens dbuf_refcount(dmu_buf_impl_t *db) 2100fa9e4066Sahrens { 2101fa9e4066Sahrens return (refcount_count(&db->db_holds)); 2102fa9e4066Sahrens } 2103fa9e4066Sahrens 2104fa9e4066Sahrens void * 2105fa9e4066Sahrens dmu_buf_set_user(dmu_buf_t *db_fake, void *user_ptr, void *user_data_ptr_ptr, 2106fa9e4066Sahrens dmu_buf_evict_func_t *evict_func) 2107fa9e4066Sahrens { 2108fa9e4066Sahrens return (dmu_buf_update_user(db_fake, NULL, user_ptr, 2109fa9e4066Sahrens user_data_ptr_ptr, evict_func)); 2110fa9e4066Sahrens } 2111fa9e4066Sahrens 2112fa9e4066Sahrens void * 2113fa9e4066Sahrens dmu_buf_set_user_ie(dmu_buf_t *db_fake, void *user_ptr, void *user_data_ptr_ptr, 2114fa9e4066Sahrens dmu_buf_evict_func_t *evict_func) 2115fa9e4066Sahrens { 2116fa9e4066Sahrens dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 2117fa9e4066Sahrens 2118c717a561Smaybee db->db_immediate_evict = TRUE; 2119fa9e4066Sahrens return (dmu_buf_update_user(db_fake, NULL, user_ptr, 2120fa9e4066Sahrens user_data_ptr_ptr, evict_func)); 2121fa9e4066Sahrens } 2122fa9e4066Sahrens 2123fa9e4066Sahrens void * 2124fa9e4066Sahrens dmu_buf_update_user(dmu_buf_t *db_fake, void *old_user_ptr, void *user_ptr, 2125fa9e4066Sahrens void *user_data_ptr_ptr, dmu_buf_evict_func_t *evict_func) 2126fa9e4066Sahrens { 2127fa9e4066Sahrens dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 2128fa9e4066Sahrens ASSERT(db->db_level == 0); 2129fa9e4066Sahrens 2130fa9e4066Sahrens ASSERT((user_ptr == NULL) == (evict_func == NULL)); 2131fa9e4066Sahrens 2132fa9e4066Sahrens mutex_enter(&db->db_mtx); 2133fa9e4066Sahrens 2134c717a561Smaybee if (db->db_user_ptr == old_user_ptr) { 2135c717a561Smaybee db->db_user_ptr = user_ptr; 2136c717a561Smaybee db->db_user_data_ptr_ptr = user_data_ptr_ptr; 2137c717a561Smaybee db->db_evict_func = evict_func; 2138fa9e4066Sahrens 2139fa9e4066Sahrens dbuf_update_data(db); 2140fa9e4066Sahrens } else { 2141c717a561Smaybee old_user_ptr = db->db_user_ptr; 2142fa9e4066Sahrens } 2143fa9e4066Sahrens 2144fa9e4066Sahrens mutex_exit(&db->db_mtx); 2145fa9e4066Sahrens return (old_user_ptr); 2146fa9e4066Sahrens } 2147fa9e4066Sahrens 2148fa9e4066Sahrens void * 2149fa9e4066Sahrens dmu_buf_get_user(dmu_buf_t *db_fake) 2150fa9e4066Sahrens { 2151fa9e4066Sahrens dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 2152fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 2153fa9e4066Sahrens 2154c717a561Smaybee return (db->db_user_ptr); 2155fa9e4066Sahrens } 2156fa9e4066Sahrens 21573d692628SSanjeev Bagewadi boolean_t 21583d692628SSanjeev Bagewadi dmu_buf_freeable(dmu_buf_t *dbuf) 21593d692628SSanjeev Bagewadi { 21603d692628SSanjeev Bagewadi boolean_t res = B_FALSE; 21613d692628SSanjeev Bagewadi dmu_buf_impl_t *db = (dmu_buf_impl_t *)dbuf; 21623d692628SSanjeev Bagewadi 21633d692628SSanjeev Bagewadi if (db->db_blkptr) 21643d692628SSanjeev Bagewadi res = dsl_dataset_block_freeable(db->db_objset->os_dsl_dataset, 2165c7cd2421SGeorge Wilson db->db_blkptr, db->db_blkptr->blk_birth); 21663d692628SSanjeev Bagewadi 21673d692628SSanjeev Bagewadi return (res); 21683d692628SSanjeev Bagewadi } 21693d692628SSanjeev Bagewadi 217080901aeaSGeorge Wilson blkptr_t * 217180901aeaSGeorge Wilson dmu_buf_get_blkptr(dmu_buf_t *db) 217280901aeaSGeorge Wilson { 217380901aeaSGeorge Wilson dmu_buf_impl_t *dbi = (dmu_buf_impl_t *)db; 217480901aeaSGeorge Wilson return (dbi->db_blkptr); 217580901aeaSGeorge Wilson } 217680901aeaSGeorge Wilson 2177c717a561Smaybee static void 2178c717a561Smaybee dbuf_check_blkptr(dnode_t *dn, dmu_buf_impl_t *db) 2179fa9e4066Sahrens { 2180c717a561Smaybee /* ASSERT(dmu_tx_is_syncing(tx) */ 2181c717a561Smaybee ASSERT(MUTEX_HELD(&db->db_mtx)); 2182c717a561Smaybee 2183c717a561Smaybee if (db->db_blkptr != NULL) 2184c717a561Smaybee return; 2185c717a561Smaybee 21860a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) { 21870a586ceaSMark Shellenbaum db->db_blkptr = &dn->dn_phys->dn_spill; 21880a586ceaSMark Shellenbaum BP_ZERO(db->db_blkptr); 21890a586ceaSMark Shellenbaum return; 21900a586ceaSMark Shellenbaum } 2191c717a561Smaybee if (db->db_level == dn->dn_phys->dn_nlevels-1) { 2192c717a561Smaybee /* 2193c717a561Smaybee * This buffer was allocated at a time when there was 2194c717a561Smaybee * no available blkptrs from the dnode, or it was 2195c717a561Smaybee * inappropriate to hook it in (i.e., nlevels mis-match). 2196c717a561Smaybee */ 2197c717a561Smaybee ASSERT(db->db_blkid < dn->dn_phys->dn_nblkptr); 2198c717a561Smaybee ASSERT(db->db_parent == NULL); 2199c717a561Smaybee db->db_parent = dn->dn_dbuf; 2200c717a561Smaybee db->db_blkptr = &dn->dn_phys->dn_blkptr[db->db_blkid]; 2201c717a561Smaybee DBUF_VERIFY(db); 2202c717a561Smaybee } else { 2203c717a561Smaybee dmu_buf_impl_t *parent = db->db_parent; 2204c717a561Smaybee int epbs = dn->dn_phys->dn_indblkshift - SPA_BLKPTRSHIFT; 2205c717a561Smaybee 2206c717a561Smaybee ASSERT(dn->dn_phys->dn_nlevels > 1); 2207c717a561Smaybee if (parent == NULL) { 2208c717a561Smaybee mutex_exit(&db->db_mtx); 2209c717a561Smaybee rw_enter(&dn->dn_struct_rwlock, RW_READER); 2210c717a561Smaybee (void) dbuf_hold_impl(dn, db->db_level+1, 2211c717a561Smaybee db->db_blkid >> epbs, FALSE, db, &parent); 2212c717a561Smaybee rw_exit(&dn->dn_struct_rwlock); 2213c717a561Smaybee mutex_enter(&db->db_mtx); 2214c717a561Smaybee db->db_parent = parent; 2215c717a561Smaybee } 2216c717a561Smaybee db->db_blkptr = (blkptr_t *)parent->db.db_data + 2217c717a561Smaybee (db->db_blkid & ((1ULL << epbs) - 1)); 2218c717a561Smaybee DBUF_VERIFY(db); 2219c717a561Smaybee } 2220c717a561Smaybee } 2221c717a561Smaybee 2222c717a561Smaybee static void 2223c717a561Smaybee dbuf_sync_indirect(dbuf_dirty_record_t *dr, dmu_tx_t *tx) 2224c717a561Smaybee { 2225c717a561Smaybee dmu_buf_impl_t *db = dr->dr_dbuf; 2226744947dcSTom Erickson dnode_t *dn; 2227c717a561Smaybee zio_t *zio; 2228c717a561Smaybee 2229c717a561Smaybee ASSERT(dmu_tx_is_syncing(tx)); 2230c717a561Smaybee 2231c717a561Smaybee dprintf_dbuf_bp(db, db->db_blkptr, "blkptr=%p", db->db_blkptr); 2232c717a561Smaybee 2233c717a561Smaybee mutex_enter(&db->db_mtx); 2234c717a561Smaybee 2235c717a561Smaybee ASSERT(db->db_level > 0); 2236c717a561Smaybee DBUF_VERIFY(db); 2237c717a561Smaybee 2238*3e30c24aSWill Andrews /* Read the block if it hasn't been read yet. */ 2239c717a561Smaybee if (db->db_buf == NULL) { 2240c717a561Smaybee mutex_exit(&db->db_mtx); 2241c717a561Smaybee (void) dbuf_read(db, NULL, DB_RF_MUST_SUCCEED); 2242c717a561Smaybee mutex_enter(&db->db_mtx); 2243c717a561Smaybee } 2244c717a561Smaybee ASSERT3U(db->db_state, ==, DB_CACHED); 2245c717a561Smaybee ASSERT(db->db_buf != NULL); 2246c717a561Smaybee 2247744947dcSTom Erickson DB_DNODE_ENTER(db); 2248744947dcSTom Erickson dn = DB_DNODE(db); 2249*3e30c24aSWill Andrews /* Indirect block size must match what the dnode thinks it is. */ 2250744947dcSTom Erickson ASSERT3U(db->db.db_size, ==, 1<<dn->dn_phys->dn_indblkshift); 2251c717a561Smaybee dbuf_check_blkptr(dn, db); 2252744947dcSTom Erickson DB_DNODE_EXIT(db); 2253c717a561Smaybee 2254*3e30c24aSWill Andrews /* Provide the pending dirty record to child dbufs */ 2255c717a561Smaybee db->db_data_pending = dr; 2256c717a561Smaybee 2257af2c4821Smaybee mutex_exit(&db->db_mtx); 2258088f3894Sahrens dbuf_write(dr, db->db_buf, tx); 2259c717a561Smaybee 2260c717a561Smaybee zio = dr->dr_zio; 2261c717a561Smaybee mutex_enter(&dr->dt.di.dr_mtx); 2262c717a561Smaybee dbuf_sync_list(&dr->dt.di.dr_children, tx); 2263c717a561Smaybee ASSERT(list_head(&dr->dt.di.dr_children) == NULL); 2264c717a561Smaybee mutex_exit(&dr->dt.di.dr_mtx); 2265c717a561Smaybee zio_nowait(zio); 2266c717a561Smaybee } 2267c717a561Smaybee 2268c717a561Smaybee static void 2269c717a561Smaybee dbuf_sync_leaf(dbuf_dirty_record_t *dr, dmu_tx_t *tx) 2270c717a561Smaybee { 2271c717a561Smaybee arc_buf_t **datap = &dr->dt.dl.dr_data; 2272c717a561Smaybee dmu_buf_impl_t *db = dr->dr_dbuf; 2273744947dcSTom Erickson dnode_t *dn; 2274744947dcSTom Erickson objset_t *os; 2275c717a561Smaybee uint64_t txg = tx->tx_txg; 2276fa9e4066Sahrens 2277fa9e4066Sahrens ASSERT(dmu_tx_is_syncing(tx)); 2278fa9e4066Sahrens 2279fa9e4066Sahrens dprintf_dbuf_bp(db, db->db_blkptr, "blkptr=%p", db->db_blkptr); 2280fa9e4066Sahrens 2281fa9e4066Sahrens mutex_enter(&db->db_mtx); 2282fa9e4066Sahrens /* 2283fa9e4066Sahrens * To be synced, we must be dirtied. But we 2284fa9e4066Sahrens * might have been freed after the dirty. 2285fa9e4066Sahrens */ 2286fa9e4066Sahrens if (db->db_state == DB_UNCACHED) { 2287fa9e4066Sahrens /* This buffer has been freed since it was dirtied */ 2288fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 2289fa9e4066Sahrens } else if (db->db_state == DB_FILL) { 2290fa9e4066Sahrens /* This buffer was freed and is now being re-filled */ 2291c717a561Smaybee ASSERT(db->db.db_data != dr->dt.dl.dr_data); 2292fa9e4066Sahrens } else { 229382c9918fSTim Haley ASSERT(db->db_state == DB_CACHED || db->db_state == DB_NOFILL); 2294fa9e4066Sahrens } 22959c9dc39aSek DBUF_VERIFY(db); 2296fa9e4066Sahrens 2297744947dcSTom Erickson DB_DNODE_ENTER(db); 2298744947dcSTom Erickson dn = DB_DNODE(db); 2299744947dcSTom Erickson 23000a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) { 23010a586ceaSMark Shellenbaum mutex_enter(&dn->dn_mtx); 23020a586ceaSMark Shellenbaum dn->dn_phys->dn_flags |= DNODE_FLAG_SPILL_BLKPTR; 23030a586ceaSMark Shellenbaum mutex_exit(&dn->dn_mtx); 23040a586ceaSMark Shellenbaum } 23050a586ceaSMark Shellenbaum 2306fa9e4066Sahrens /* 2307c717a561Smaybee * If this is a bonus buffer, simply copy the bonus data into the 2308c717a561Smaybee * dnode. It will be written out when the dnode is synced (and it 2309c717a561Smaybee * will be synced, since it must have been dirty for dbuf_sync to 2310c717a561Smaybee * be called). 2311fa9e4066Sahrens */ 23120a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 2313c717a561Smaybee dbuf_dirty_record_t **drp; 23141934e92fSmaybee 2315ea8dc4b6Seschrock ASSERT(*datap != NULL); 2316fb09f5aaSMadhav Suresh ASSERT0(db->db_level); 2317ea8dc4b6Seschrock ASSERT3U(dn->dn_phys->dn_bonuslen, <=, DN_MAX_BONUSLEN); 2318ea8dc4b6Seschrock bcopy(*datap, DN_BONUS(dn->dn_phys), dn->dn_phys->dn_bonuslen); 2319744947dcSTom Erickson DB_DNODE_EXIT(db); 2320744947dcSTom Erickson 23210e8c6158Smaybee if (*datap != db->db.db_data) { 2322ea8dc4b6Seschrock zio_buf_free(*datap, DN_MAX_BONUSLEN); 23235a98e54bSBrendan Gregg - Sun Microsystems arc_space_return(DN_MAX_BONUSLEN, ARC_SPACE_OTHER); 23240e8c6158Smaybee } 2325ea8dc4b6Seschrock db->db_data_pending = NULL; 2326c717a561Smaybee drp = &db->db_last_dirty; 2327c717a561Smaybee while (*drp != dr) 2328c717a561Smaybee drp = &(*drp)->dr_next; 232917f17c2dSbonwick ASSERT(dr->dr_next == NULL); 2330b24ab676SJeff Bonwick ASSERT(dr->dr_dbuf == db); 233117f17c2dSbonwick *drp = dr->dr_next; 2332c717a561Smaybee kmem_free(dr, sizeof (dbuf_dirty_record_t)); 2333ea8dc4b6Seschrock ASSERT(db->db_dirtycnt > 0); 2334ea8dc4b6Seschrock db->db_dirtycnt -= 1; 2335b24ab676SJeff Bonwick dbuf_rele_and_unlock(db, (void *)(uintptr_t)txg); 2336ea8dc4b6Seschrock return; 2337ea8dc4b6Seschrock } 2338ea8dc4b6Seschrock 2339744947dcSTom Erickson os = dn->dn_objset; 2340744947dcSTom Erickson 2341f82bfe17Sgw /* 2342f82bfe17Sgw * This function may have dropped the db_mtx lock allowing a dmu_sync 2343f82bfe17Sgw * operation to sneak in. As a result, we need to ensure that we 2344f82bfe17Sgw * don't check the dr_override_state until we have returned from 2345f82bfe17Sgw * dbuf_check_blkptr. 2346f82bfe17Sgw */ 2347f82bfe17Sgw dbuf_check_blkptr(dn, db); 2348f82bfe17Sgw 2349c717a561Smaybee /* 2350744947dcSTom Erickson * If this buffer is in the middle of an immediate write, 2351c717a561Smaybee * wait for the synchronous IO to complete. 2352c717a561Smaybee */ 2353c717a561Smaybee while (dr->dt.dl.dr_override_state == DR_IN_DMU_SYNC) { 2354c717a561Smaybee ASSERT(dn->dn_object != DMU_META_DNODE_OBJECT); 2355c717a561Smaybee cv_wait(&db->db_changed, &db->db_mtx); 2356c717a561Smaybee ASSERT(dr->dt.dl.dr_override_state != DR_NOT_OVERRIDDEN); 2357c717a561Smaybee } 2358c5c6ffa0Smaybee 2359ab69d62fSMatthew Ahrens if (db->db_state != DB_NOFILL && 2360ab69d62fSMatthew Ahrens dn->dn_object != DMU_META_DNODE_OBJECT && 2361ab69d62fSMatthew Ahrens refcount_count(&db->db_holds) > 1 && 2362b24ab676SJeff Bonwick dr->dt.dl.dr_override_state != DR_OVERRIDDEN && 2363ab69d62fSMatthew Ahrens *datap == db->db_buf) { 2364ab69d62fSMatthew Ahrens /* 2365ab69d62fSMatthew Ahrens * If this buffer is currently "in use" (i.e., there 2366ab69d62fSMatthew Ahrens * are active holds and db_data still references it), 2367ab69d62fSMatthew Ahrens * then make a copy before we start the write so that 2368ab69d62fSMatthew Ahrens * any modifications from the open txg will not leak 2369ab69d62fSMatthew Ahrens * into this write. 2370ab69d62fSMatthew Ahrens * 2371ab69d62fSMatthew Ahrens * NOTE: this copy does not need to be made for 2372ab69d62fSMatthew Ahrens * objects only modified in the syncing context (e.g. 2373ab69d62fSMatthew Ahrens * DNONE_DNODE blocks). 2374ab69d62fSMatthew Ahrens */ 2375ab69d62fSMatthew Ahrens int blksz = arc_buf_size(*datap); 2376ab69d62fSMatthew Ahrens arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 2377ab69d62fSMatthew Ahrens *datap = arc_buf_alloc(os->os_spa, blksz, db, type); 2378ab69d62fSMatthew Ahrens bcopy(db->db.db_data, (*datap)->b_data, blksz); 237982c9918fSTim Haley } 2380c717a561Smaybee db->db_data_pending = dr; 2381fa9e4066Sahrens 2382c717a561Smaybee mutex_exit(&db->db_mtx); 2383fa9e4066Sahrens 2384088f3894Sahrens dbuf_write(dr, *datap, tx); 2385fa9e4066Sahrens 2386c717a561Smaybee ASSERT(!list_link_active(&dr->dr_dirty_node)); 2387744947dcSTom Erickson if (dn->dn_object == DMU_META_DNODE_OBJECT) { 2388c717a561Smaybee list_insert_tail(&dn->dn_dirty_records[txg&TXG_MASK], dr); 2389744947dcSTom Erickson DB_DNODE_EXIT(db); 2390744947dcSTom Erickson } else { 2391744947dcSTom Erickson /* 2392744947dcSTom Erickson * Although zio_nowait() does not "wait for an IO", it does 2393744947dcSTom Erickson * initiate the IO. If this is an empty write it seems plausible 2394744947dcSTom Erickson * that the IO could actually be completed before the nowait 2395744947dcSTom Erickson * returns. We need to DB_DNODE_EXIT() first in case 2396744947dcSTom Erickson * zio_nowait() invalidates the dbuf. 2397744947dcSTom Erickson */ 2398744947dcSTom Erickson DB_DNODE_EXIT(db); 2399c717a561Smaybee zio_nowait(dr->dr_zio); 2400744947dcSTom Erickson } 2401c717a561Smaybee } 240223b11526Smaybee 2403c717a561Smaybee void 2404c717a561Smaybee dbuf_sync_list(list_t *list, dmu_tx_t *tx) 2405c717a561Smaybee { 2406c717a561Smaybee dbuf_dirty_record_t *dr; 2407c717a561Smaybee 2408c717a561Smaybee while (dr = list_head(list)) { 2409c717a561Smaybee if (dr->dr_zio != NULL) { 2410c717a561Smaybee /* 2411c717a561Smaybee * If we find an already initialized zio then we 2412c717a561Smaybee * are processing the meta-dnode, and we have finished. 2413c717a561Smaybee * The dbufs for all dnodes are put back on the list 2414c717a561Smaybee * during processing, so that we can zio_wait() 2415c717a561Smaybee * these IOs after initiating all child IOs. 2416c717a561Smaybee */ 2417c717a561Smaybee ASSERT3U(dr->dr_dbuf->db.db_object, ==, 2418c717a561Smaybee DMU_META_DNODE_OBJECT); 2419c717a561Smaybee break; 242023b11526Smaybee } 2421c717a561Smaybee list_remove(list, dr); 2422c717a561Smaybee if (dr->dr_dbuf->db_level > 0) 2423c717a561Smaybee dbuf_sync_indirect(dr, tx); 2424c717a561Smaybee else 2425c717a561Smaybee dbuf_sync_leaf(dr, tx); 242623b11526Smaybee } 2427c717a561Smaybee } 242823b11526Smaybee 2429fa9e4066Sahrens /* ARGSUSED */ 2430fa9e4066Sahrens static void 2431c717a561Smaybee dbuf_write_ready(zio_t *zio, arc_buf_t *buf, void *vdb) 2432fa9e4066Sahrens { 2433fa9e4066Sahrens dmu_buf_impl_t *db = vdb; 2434744947dcSTom Erickson dnode_t *dn; 2435e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 2436c717a561Smaybee blkptr_t *bp_orig = &zio->io_bp_orig; 2437b24ab676SJeff Bonwick spa_t *spa = zio->io_spa; 2438b24ab676SJeff Bonwick int64_t delta; 2439fa9e4066Sahrens uint64_t fill = 0; 2440b24ab676SJeff Bonwick int i; 2441fa9e4066Sahrens 2442e14bb325SJeff Bonwick ASSERT(db->db_blkptr == bp); 2443e14bb325SJeff Bonwick 2444744947dcSTom Erickson DB_DNODE_ENTER(db); 2445744947dcSTom Erickson dn = DB_DNODE(db); 2446b24ab676SJeff Bonwick delta = bp_get_dsize_sync(spa, bp) - bp_get_dsize_sync(spa, bp_orig); 2447b24ab676SJeff Bonwick dnode_diduse_space(dn, delta - zio->io_prev_space_delta); 2448b24ab676SJeff Bonwick zio->io_prev_space_delta = delta; 2449fa9e4066Sahrens 2450e14bb325SJeff Bonwick if (BP_IS_HOLE(bp)) { 2451b24ab676SJeff Bonwick ASSERT(bp->blk_fill == 0); 2452744947dcSTom Erickson DB_DNODE_EXIT(db); 2453c717a561Smaybee return; 2454c717a561Smaybee } 2455c5c6ffa0Smaybee 24560a586ceaSMark Shellenbaum ASSERT((db->db_blkid != DMU_SPILL_BLKID && 24570a586ceaSMark Shellenbaum BP_GET_TYPE(bp) == dn->dn_type) || 24580a586ceaSMark Shellenbaum (db->db_blkid == DMU_SPILL_BLKID && 24590a586ceaSMark Shellenbaum BP_GET_TYPE(bp) == dn->dn_bonustype)); 2460e14bb325SJeff Bonwick ASSERT(BP_GET_LEVEL(bp) == db->db_level); 2461e14bb325SJeff Bonwick 2462c717a561Smaybee mutex_enter(&db->db_mtx); 2463fa9e4066Sahrens 24640a586ceaSMark Shellenbaum #ifdef ZFS_DEBUG 24650a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) { 24660a586ceaSMark Shellenbaum ASSERT(dn->dn_phys->dn_flags & DNODE_FLAG_SPILL_BLKPTR); 24670a586ceaSMark Shellenbaum ASSERT(!(BP_IS_HOLE(db->db_blkptr)) && 24680a586ceaSMark Shellenbaum db->db_blkptr == &dn->dn_phys->dn_spill); 24690a586ceaSMark Shellenbaum } 24700a586ceaSMark Shellenbaum #endif 24710a586ceaSMark Shellenbaum 2472fa9e4066Sahrens if (db->db_level == 0) { 2473fa9e4066Sahrens mutex_enter(&dn->dn_mtx); 24740a586ceaSMark Shellenbaum if (db->db_blkid > dn->dn_phys->dn_maxblkid && 24750a586ceaSMark Shellenbaum db->db_blkid != DMU_SPILL_BLKID) 2476fa9e4066Sahrens dn->dn_phys->dn_maxblkid = db->db_blkid; 2477fa9e4066Sahrens mutex_exit(&dn->dn_mtx); 2478fa9e4066Sahrens 2479fa9e4066Sahrens if (dn->dn_type == DMU_OT_DNODE) { 2480fa9e4066Sahrens dnode_phys_t *dnp = db->db.db_data; 2481fa9e4066Sahrens for (i = db->db.db_size >> DNODE_SHIFT; i > 0; 2482fa9e4066Sahrens i--, dnp++) { 2483fa9e4066Sahrens if (dnp->dn_type != DMU_OT_NONE) 2484fa9e4066Sahrens fill++; 2485fa9e4066Sahrens } 2486fa9e4066Sahrens } else { 2487c717a561Smaybee fill = 1; 2488fa9e4066Sahrens } 2489fa9e4066Sahrens } else { 2490e14bb325SJeff Bonwick blkptr_t *ibp = db->db.db_data; 2491fa9e4066Sahrens ASSERT3U(db->db.db_size, ==, 1<<dn->dn_phys->dn_indblkshift); 2492e14bb325SJeff Bonwick for (i = db->db.db_size >> SPA_BLKPTRSHIFT; i > 0; i--, ibp++) { 2493e14bb325SJeff Bonwick if (BP_IS_HOLE(ibp)) 2494fa9e4066Sahrens continue; 2495e14bb325SJeff Bonwick fill += ibp->blk_fill; 2496fa9e4066Sahrens } 2497fa9e4066Sahrens } 2498744947dcSTom Erickson DB_DNODE_EXIT(db); 2499fa9e4066Sahrens 2500e14bb325SJeff Bonwick bp->blk_fill = fill; 2501c717a561Smaybee 2502c717a561Smaybee mutex_exit(&db->db_mtx); 2503c717a561Smaybee } 2504fa9e4066Sahrens 2505c717a561Smaybee /* ARGSUSED */ 2506c717a561Smaybee static void 2507c717a561Smaybee dbuf_write_done(zio_t *zio, arc_buf_t *buf, void *vdb) 2508c717a561Smaybee { 2509c717a561Smaybee dmu_buf_impl_t *db = vdb; 2510b24ab676SJeff Bonwick blkptr_t *bp = zio->io_bp; 2511b24ab676SJeff Bonwick blkptr_t *bp_orig = &zio->io_bp_orig; 2512c717a561Smaybee uint64_t txg = zio->io_txg; 2513c717a561Smaybee dbuf_dirty_record_t **drp, *dr; 2514c717a561Smaybee 2515fb09f5aaSMadhav Suresh ASSERT0(zio->io_error); 2516b24ab676SJeff Bonwick ASSERT(db->db_blkptr == bp); 2517b24ab676SJeff Bonwick 251880901aeaSGeorge Wilson /* 251980901aeaSGeorge Wilson * For nopwrites and rewrites we ensure that the bp matches our 252080901aeaSGeorge Wilson * original and bypass all the accounting. 252180901aeaSGeorge Wilson */ 252280901aeaSGeorge Wilson if (zio->io_flags & (ZIO_FLAG_IO_REWRITE | ZIO_FLAG_NOPWRITE)) { 2523b24ab676SJeff Bonwick ASSERT(BP_EQUAL(bp, bp_orig)); 2524b24ab676SJeff Bonwick } else { 2525744947dcSTom Erickson objset_t *os; 2526744947dcSTom Erickson dsl_dataset_t *ds; 2527744947dcSTom Erickson dmu_tx_t *tx; 2528744947dcSTom Erickson 2529744947dcSTom Erickson DB_GET_OBJSET(&os, db); 2530744947dcSTom Erickson ds = os->os_dsl_dataset; 2531744947dcSTom Erickson tx = os->os_synctx; 2532b24ab676SJeff Bonwick 2533b24ab676SJeff Bonwick (void) dsl_dataset_block_kill(ds, bp_orig, tx, B_TRUE); 2534b24ab676SJeff Bonwick dsl_dataset_block_born(ds, bp, tx); 2535b24ab676SJeff Bonwick } 2536c717a561Smaybee 2537c717a561Smaybee mutex_enter(&db->db_mtx); 2538c717a561Smaybee 2539b24ab676SJeff Bonwick DBUF_VERIFY(db); 2540b24ab676SJeff Bonwick 2541c717a561Smaybee drp = &db->db_last_dirty; 254217f17c2dSbonwick while ((dr = *drp) != db->db_data_pending) 254317f17c2dSbonwick drp = &dr->dr_next; 254417f17c2dSbonwick ASSERT(!list_link_active(&dr->dr_dirty_node)); 254517f17c2dSbonwick ASSERT(dr->dr_txg == txg); 2546b24ab676SJeff Bonwick ASSERT(dr->dr_dbuf == db); 254717f17c2dSbonwick ASSERT(dr->dr_next == NULL); 254817f17c2dSbonwick *drp = dr->dr_next; 2549c717a561Smaybee 25500a586ceaSMark Shellenbaum #ifdef ZFS_DEBUG 25510a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) { 2552744947dcSTom Erickson dnode_t *dn; 2553744947dcSTom Erickson 2554744947dcSTom Erickson DB_DNODE_ENTER(db); 2555744947dcSTom Erickson dn = DB_DNODE(db); 25560a586ceaSMark Shellenbaum ASSERT(dn->dn_phys->dn_flags & DNODE_FLAG_SPILL_BLKPTR); 25570a586ceaSMark Shellenbaum ASSERT(!(BP_IS_HOLE(db->db_blkptr)) && 25580a586ceaSMark Shellenbaum db->db_blkptr == &dn->dn_phys->dn_spill); 2559744947dcSTom Erickson DB_DNODE_EXIT(db); 25600a586ceaSMark Shellenbaum } 25610a586ceaSMark Shellenbaum #endif 25620a586ceaSMark Shellenbaum 2563c717a561Smaybee if (db->db_level == 0) { 25640a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 2565c717a561Smaybee ASSERT(dr->dt.dl.dr_override_state == DR_NOT_OVERRIDDEN); 256682c9918fSTim Haley if (db->db_state != DB_NOFILL) { 256782c9918fSTim Haley if (dr->dt.dl.dr_data != db->db_buf) 256882c9918fSTim Haley VERIFY(arc_buf_remove_ref(dr->dt.dl.dr_data, 25693b2aab18SMatthew Ahrens db)); 2570b24ab676SJeff Bonwick else if (!arc_released(db->db_buf)) 257182c9918fSTim Haley arc_set_callback(db->db_buf, dbuf_do_evict, db); 257282c9918fSTim Haley } 2573c717a561Smaybee } else { 2574744947dcSTom Erickson dnode_t *dn; 2575744947dcSTom Erickson 2576744947dcSTom Erickson DB_DNODE_ENTER(db); 2577744947dcSTom Erickson dn = DB_DNODE(db); 2578c717a561Smaybee ASSERT(list_head(&dr->dt.di.dr_children) == NULL); 2579c717a561Smaybee ASSERT3U(db->db.db_size, ==, 1<<dn->dn_phys->dn_indblkshift); 2580c717a561Smaybee if (!BP_IS_HOLE(db->db_blkptr)) { 2581c717a561Smaybee int epbs = 2582c717a561Smaybee dn->dn_phys->dn_indblkshift - SPA_BLKPTRSHIFT; 2583c717a561Smaybee ASSERT3U(BP_GET_LSIZE(db->db_blkptr), ==, 2584c717a561Smaybee db->db.db_size); 2585c717a561Smaybee ASSERT3U(dn->dn_phys->dn_maxblkid 2586c717a561Smaybee >> (db->db_level * epbs), >=, db->db_blkid); 2587c717a561Smaybee arc_set_callback(db->db_buf, dbuf_do_evict, db); 2588c717a561Smaybee } 2589744947dcSTom Erickson DB_DNODE_EXIT(db); 2590c25056deSgw mutex_destroy(&dr->dt.di.dr_mtx); 2591c25056deSgw list_destroy(&dr->dt.di.dr_children); 2592c717a561Smaybee } 2593c717a561Smaybee kmem_free(dr, sizeof (dbuf_dirty_record_t)); 2594fa9e4066Sahrens 2595fa9e4066Sahrens cv_broadcast(&db->db_changed); 2596fa9e4066Sahrens ASSERT(db->db_dirtycnt > 0); 2597fa9e4066Sahrens db->db_dirtycnt -= 1; 2598c717a561Smaybee db->db_data_pending = NULL; 2599b24ab676SJeff Bonwick dbuf_rele_and_unlock(db, (void *)(uintptr_t)txg); 2600b24ab676SJeff Bonwick } 2601b24ab676SJeff Bonwick 2602b24ab676SJeff Bonwick static void 2603b24ab676SJeff Bonwick dbuf_write_nofill_ready(zio_t *zio) 2604b24ab676SJeff Bonwick { 2605b24ab676SJeff Bonwick dbuf_write_ready(zio, NULL, zio->io_private); 2606b24ab676SJeff Bonwick } 2607b24ab676SJeff Bonwick 2608b24ab676SJeff Bonwick static void 2609b24ab676SJeff Bonwick dbuf_write_nofill_done(zio_t *zio) 2610b24ab676SJeff Bonwick { 2611b24ab676SJeff Bonwick dbuf_write_done(zio, NULL, zio->io_private); 2612b24ab676SJeff Bonwick } 2613b24ab676SJeff Bonwick 2614b24ab676SJeff Bonwick static void 2615b24ab676SJeff Bonwick dbuf_write_override_ready(zio_t *zio) 2616b24ab676SJeff Bonwick { 2617b24ab676SJeff Bonwick dbuf_dirty_record_t *dr = zio->io_private; 2618b24ab676SJeff Bonwick dmu_buf_impl_t *db = dr->dr_dbuf; 2619b24ab676SJeff Bonwick 2620b24ab676SJeff Bonwick dbuf_write_ready(zio, NULL, db); 2621b24ab676SJeff Bonwick } 2622b24ab676SJeff Bonwick 2623b24ab676SJeff Bonwick static void 2624b24ab676SJeff Bonwick dbuf_write_override_done(zio_t *zio) 2625b24ab676SJeff Bonwick { 2626b24ab676SJeff Bonwick dbuf_dirty_record_t *dr = zio->io_private; 2627b24ab676SJeff Bonwick dmu_buf_impl_t *db = dr->dr_dbuf; 2628b24ab676SJeff Bonwick blkptr_t *obp = &dr->dt.dl.dr_overridden_by; 2629b24ab676SJeff Bonwick 2630b24ab676SJeff Bonwick mutex_enter(&db->db_mtx); 2631b24ab676SJeff Bonwick if (!BP_EQUAL(zio->io_bp, obp)) { 2632b24ab676SJeff Bonwick if (!BP_IS_HOLE(obp)) 2633b24ab676SJeff Bonwick dsl_free(spa_get_dsl(zio->io_spa), zio->io_txg, obp); 2634b24ab676SJeff Bonwick arc_release(dr->dt.dl.dr_data, db); 2635b24ab676SJeff Bonwick } 2636fa9e4066Sahrens mutex_exit(&db->db_mtx); 2637fa9e4066Sahrens 2638b24ab676SJeff Bonwick dbuf_write_done(zio, NULL, db); 2639b24ab676SJeff Bonwick } 2640b24ab676SJeff Bonwick 2641*3e30c24aSWill Andrews /* Issue I/O to commit a dirty buffer to disk. */ 2642b24ab676SJeff Bonwick static void 2643b24ab676SJeff Bonwick dbuf_write(dbuf_dirty_record_t *dr, arc_buf_t *data, dmu_tx_t *tx) 2644b24ab676SJeff Bonwick { 2645b24ab676SJeff Bonwick dmu_buf_impl_t *db = dr->dr_dbuf; 2646744947dcSTom Erickson dnode_t *dn; 2647744947dcSTom Erickson objset_t *os; 2648b24ab676SJeff Bonwick dmu_buf_impl_t *parent = db->db_parent; 2649b24ab676SJeff Bonwick uint64_t txg = tx->tx_txg; 2650b24ab676SJeff Bonwick zbookmark_t zb; 2651b24ab676SJeff Bonwick zio_prop_t zp; 2652b24ab676SJeff Bonwick zio_t *zio; 26530a586ceaSMark Shellenbaum int wp_flag = 0; 2654b24ab676SJeff Bonwick 2655744947dcSTom Erickson DB_DNODE_ENTER(db); 2656744947dcSTom Erickson dn = DB_DNODE(db); 2657744947dcSTom Erickson os = dn->dn_objset; 2658744947dcSTom Erickson 2659b24ab676SJeff Bonwick if (db->db_state != DB_NOFILL) { 2660b24ab676SJeff Bonwick if (db->db_level > 0 || dn->dn_type == DMU_OT_DNODE) { 2661b24ab676SJeff Bonwick /* 2662b24ab676SJeff Bonwick * Private object buffers are released here rather 2663b24ab676SJeff Bonwick * than in dbuf_dirty() since they are only modified 2664b24ab676SJeff Bonwick * in the syncing context and we don't want the 2665b24ab676SJeff Bonwick * overhead of making multiple copies of the data. 2666b24ab676SJeff Bonwick */ 2667b24ab676SJeff Bonwick if (BP_IS_HOLE(db->db_blkptr)) { 2668b24ab676SJeff Bonwick arc_buf_thaw(data); 2669b24ab676SJeff Bonwick } else { 26703f9d6ad7SLin Ling dbuf_release_bp(db); 2671b24ab676SJeff Bonwick } 2672b24ab676SJeff Bonwick } 2673b24ab676SJeff Bonwick } 2674b24ab676SJeff Bonwick 2675b24ab676SJeff Bonwick if (parent != dn->dn_dbuf) { 2676*3e30c24aSWill Andrews /* Our parent is an indirect block. */ 2677*3e30c24aSWill Andrews /* We have a dirty parent that has been scheduled for write. */ 2678b24ab676SJeff Bonwick ASSERT(parent && parent->db_data_pending); 2679*3e30c24aSWill Andrews /* Our parent's buffer is one level closer to the dnode. */ 2680b24ab676SJeff Bonwick ASSERT(db->db_level == parent->db_level-1); 2681*3e30c24aSWill Andrews /* 2682*3e30c24aSWill Andrews * We're about to modify our parent's db_data by modifying 2683*3e30c24aSWill Andrews * our block pointer, so the parent must be released. 2684*3e30c24aSWill Andrews */ 2685b24ab676SJeff Bonwick ASSERT(arc_released(parent->db_buf)); 2686b24ab676SJeff Bonwick zio = parent->db_data_pending->dr_zio; 2687b24ab676SJeff Bonwick } else { 2688*3e30c24aSWill Andrews /* Our parent is the dnode itself. */ 26890a586ceaSMark Shellenbaum ASSERT((db->db_level == dn->dn_phys->dn_nlevels-1 && 26900a586ceaSMark Shellenbaum db->db_blkid != DMU_SPILL_BLKID) || 26910a586ceaSMark Shellenbaum (db->db_blkid == DMU_SPILL_BLKID && db->db_level == 0)); 26920a586ceaSMark Shellenbaum if (db->db_blkid != DMU_SPILL_BLKID) 26930a586ceaSMark Shellenbaum ASSERT3P(db->db_blkptr, ==, 26940a586ceaSMark Shellenbaum &dn->dn_phys->dn_blkptr[db->db_blkid]); 2695b24ab676SJeff Bonwick zio = dn->dn_zio; 2696b24ab676SJeff Bonwick } 2697b24ab676SJeff Bonwick 2698b24ab676SJeff Bonwick ASSERT(db->db_level == 0 || data == db->db_buf); 2699b24ab676SJeff Bonwick ASSERT3U(db->db_blkptr->blk_birth, <=, txg); 2700b24ab676SJeff Bonwick ASSERT(zio); 2701fa9e4066Sahrens 2702b24ab676SJeff Bonwick SET_BOOKMARK(&zb, os->os_dsl_dataset ? 2703b24ab676SJeff Bonwick os->os_dsl_dataset->ds_object : DMU_META_OBJSET, 2704b24ab676SJeff Bonwick db->db.db_object, db->db_level, db->db_blkid); 2705b24ab676SJeff Bonwick 27060a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) 27070a586ceaSMark Shellenbaum wp_flag = WP_SPILL; 27080a586ceaSMark Shellenbaum wp_flag |= (db->db_state == DB_NOFILL) ? WP_NOFILL : 0; 27090a586ceaSMark Shellenbaum 27100a586ceaSMark Shellenbaum dmu_write_policy(os, dn, db->db_level, wp_flag, &zp); 2711744947dcSTom Erickson DB_DNODE_EXIT(db); 2712b24ab676SJeff Bonwick 2713b24ab676SJeff Bonwick if (db->db_level == 0 && dr->dt.dl.dr_override_state == DR_OVERRIDDEN) { 2714b24ab676SJeff Bonwick ASSERT(db->db_state != DB_NOFILL); 2715b24ab676SJeff Bonwick dr->dr_zio = zio_write(zio, os->os_spa, txg, 2716b24ab676SJeff Bonwick db->db_blkptr, data->b_data, arc_buf_size(data), &zp, 2717b24ab676SJeff Bonwick dbuf_write_override_ready, dbuf_write_override_done, dr, 2718b24ab676SJeff Bonwick ZIO_PRIORITY_ASYNC_WRITE, ZIO_FLAG_MUSTSUCCEED, &zb); 2719b24ab676SJeff Bonwick mutex_enter(&db->db_mtx); 2720b24ab676SJeff Bonwick dr->dt.dl.dr_override_state = DR_NOT_OVERRIDDEN; 2721b24ab676SJeff Bonwick zio_write_override(dr->dr_zio, &dr->dt.dl.dr_overridden_by, 272280901aeaSGeorge Wilson dr->dt.dl.dr_copies, dr->dt.dl.dr_nopwrite); 2723b24ab676SJeff Bonwick mutex_exit(&db->db_mtx); 2724b24ab676SJeff Bonwick } else if (db->db_state == DB_NOFILL) { 2725b24ab676SJeff Bonwick ASSERT(zp.zp_checksum == ZIO_CHECKSUM_OFF); 2726b24ab676SJeff Bonwick dr->dr_zio = zio_write(zio, os->os_spa, txg, 2727b24ab676SJeff Bonwick db->db_blkptr, NULL, db->db.db_size, &zp, 2728b24ab676SJeff Bonwick dbuf_write_nofill_ready, dbuf_write_nofill_done, db, 2729b24ab676SJeff Bonwick ZIO_PRIORITY_ASYNC_WRITE, 2730b24ab676SJeff Bonwick ZIO_FLAG_MUSTSUCCEED | ZIO_FLAG_NODATA, &zb); 2731b24ab676SJeff Bonwick } else { 2732b24ab676SJeff Bonwick ASSERT(arc_released(data)); 2733b24ab676SJeff Bonwick dr->dr_zio = arc_write(zio, os->os_spa, txg, 2734aad02571SSaso Kiselkov db->db_blkptr, data, DBUF_IS_L2CACHEABLE(db), 2735aad02571SSaso Kiselkov DBUF_IS_L2COMPRESSIBLE(db), &zp, dbuf_write_ready, 2736aad02571SSaso Kiselkov dbuf_write_done, db, ZIO_PRIORITY_ASYNC_WRITE, 2737aad02571SSaso Kiselkov ZIO_FLAG_MUSTSUCCEED, &zb); 2738b24ab676SJeff Bonwick } 2739fa9e4066Sahrens } 2740