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> 30*2f3d8780SMatthew Ahrens #include <sys/dmu_send.h> 31fa9e4066Sahrens #include <sys/dmu_impl.h> 32fa9e4066Sahrens #include <sys/dbuf.h> 33fa9e4066Sahrens #include <sys/dmu_objset.h> 34fa9e4066Sahrens #include <sys/dsl_dataset.h> 35fa9e4066Sahrens #include <sys/dsl_dir.h> 36fa9e4066Sahrens #include <sys/dmu_tx.h> 37fa9e4066Sahrens #include <sys/spa.h> 38fa9e4066Sahrens #include <sys/zio.h> 39fa9e4066Sahrens #include <sys/dmu_zfetch.h> 400a586ceaSMark Shellenbaum #include <sys/sa.h> 410a586ceaSMark Shellenbaum #include <sys/sa_impl.h> 42fa9e4066Sahrens 43fa9e4066Sahrens static void dbuf_destroy(dmu_buf_impl_t *db); 443b2aab18SMatthew Ahrens static boolean_t dbuf_undirty(dmu_buf_impl_t *db, dmu_tx_t *tx); 45088f3894Sahrens static void dbuf_write(dbuf_dirty_record_t *dr, arc_buf_t *data, dmu_tx_t *tx); 46fa9e4066Sahrens 47fa9e4066Sahrens /* 48fa9e4066Sahrens * Global data structures and functions for the dbuf cache. 49fa9e4066Sahrens */ 50fa9e4066Sahrens static kmem_cache_t *dbuf_cache; 51fa9e4066Sahrens 52fa9e4066Sahrens /* ARGSUSED */ 53fa9e4066Sahrens static int 54fa9e4066Sahrens dbuf_cons(void *vdb, void *unused, int kmflag) 55fa9e4066Sahrens { 56fa9e4066Sahrens dmu_buf_impl_t *db = vdb; 57fa9e4066Sahrens bzero(db, sizeof (dmu_buf_impl_t)); 58fa9e4066Sahrens 59fa9e4066Sahrens mutex_init(&db->db_mtx, NULL, MUTEX_DEFAULT, NULL); 60fa9e4066Sahrens cv_init(&db->db_changed, NULL, CV_DEFAULT, NULL); 61fa9e4066Sahrens refcount_create(&db->db_holds); 62fa9e4066Sahrens return (0); 63fa9e4066Sahrens } 64fa9e4066Sahrens 65fa9e4066Sahrens /* ARGSUSED */ 66fa9e4066Sahrens static void 67fa9e4066Sahrens dbuf_dest(void *vdb, void *unused) 68fa9e4066Sahrens { 69fa9e4066Sahrens dmu_buf_impl_t *db = vdb; 70fa9e4066Sahrens mutex_destroy(&db->db_mtx); 71fa9e4066Sahrens cv_destroy(&db->db_changed); 72fa9e4066Sahrens refcount_destroy(&db->db_holds); 73fa9e4066Sahrens } 74fa9e4066Sahrens 75fa9e4066Sahrens /* 76fa9e4066Sahrens * dbuf hash table routines 77fa9e4066Sahrens */ 78fa9e4066Sahrens static dbuf_hash_table_t dbuf_hash_table; 79fa9e4066Sahrens 80fa9e4066Sahrens static uint64_t dbuf_hash_count; 81fa9e4066Sahrens 82fa9e4066Sahrens static uint64_t 83fa9e4066Sahrens dbuf_hash(void *os, uint64_t obj, uint8_t lvl, uint64_t blkid) 84fa9e4066Sahrens { 85fa9e4066Sahrens uintptr_t osv = (uintptr_t)os; 86fa9e4066Sahrens uint64_t crc = -1ULL; 87fa9e4066Sahrens 88fa9e4066Sahrens ASSERT(zfs_crc64_table[128] == ZFS_CRC64_POLY); 89fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (lvl)) & 0xFF]; 90fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (osv >> 6)) & 0xFF]; 91fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (obj >> 0)) & 0xFF]; 92fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (obj >> 8)) & 0xFF]; 93fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (blkid >> 0)) & 0xFF]; 94fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (blkid >> 8)) & 0xFF]; 95fa9e4066Sahrens 96fa9e4066Sahrens crc ^= (osv>>14) ^ (obj>>16) ^ (blkid>>16); 97fa9e4066Sahrens 98fa9e4066Sahrens return (crc); 99fa9e4066Sahrens } 100fa9e4066Sahrens 101fa9e4066Sahrens #define DBUF_HASH(os, obj, level, blkid) dbuf_hash(os, obj, level, blkid); 102fa9e4066Sahrens 103fa9e4066Sahrens #define DBUF_EQUAL(dbuf, os, obj, level, blkid) \ 104fa9e4066Sahrens ((dbuf)->db.db_object == (obj) && \ 105fa9e4066Sahrens (dbuf)->db_objset == (os) && \ 106fa9e4066Sahrens (dbuf)->db_level == (level) && \ 107fa9e4066Sahrens (dbuf)->db_blkid == (blkid)) 108fa9e4066Sahrens 109fa9e4066Sahrens dmu_buf_impl_t * 110fa9e4066Sahrens dbuf_find(dnode_t *dn, uint8_t level, uint64_t blkid) 111fa9e4066Sahrens { 112fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 113503ad85cSMatthew Ahrens objset_t *os = dn->dn_objset; 114fa9e4066Sahrens uint64_t obj = dn->dn_object; 115fa9e4066Sahrens uint64_t hv = DBUF_HASH(os, obj, level, blkid); 116fa9e4066Sahrens uint64_t idx = hv & h->hash_table_mask; 117fa9e4066Sahrens dmu_buf_impl_t *db; 118fa9e4066Sahrens 119fa9e4066Sahrens mutex_enter(DBUF_HASH_MUTEX(h, idx)); 120fa9e4066Sahrens for (db = h->hash_table[idx]; db != NULL; db = db->db_hash_next) { 121fa9e4066Sahrens if (DBUF_EQUAL(db, os, obj, level, blkid)) { 122fa9e4066Sahrens mutex_enter(&db->db_mtx); 123ea8dc4b6Seschrock if (db->db_state != DB_EVICTING) { 124fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 125fa9e4066Sahrens return (db); 126fa9e4066Sahrens } 127fa9e4066Sahrens mutex_exit(&db->db_mtx); 128fa9e4066Sahrens } 129fa9e4066Sahrens } 130fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 131fa9e4066Sahrens return (NULL); 132fa9e4066Sahrens } 133fa9e4066Sahrens 134fa9e4066Sahrens /* 135fa9e4066Sahrens * Insert an entry into the hash table. If there is already an element 136fa9e4066Sahrens * equal to elem in the hash table, then the already existing element 137fa9e4066Sahrens * will be returned and the new element will not be inserted. 138fa9e4066Sahrens * Otherwise returns NULL. 139fa9e4066Sahrens */ 140fa9e4066Sahrens static dmu_buf_impl_t * 141fa9e4066Sahrens dbuf_hash_insert(dmu_buf_impl_t *db) 142fa9e4066Sahrens { 143fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 144503ad85cSMatthew Ahrens objset_t *os = db->db_objset; 145fa9e4066Sahrens uint64_t obj = db->db.db_object; 146fa9e4066Sahrens int level = db->db_level; 147fa9e4066Sahrens uint64_t blkid = db->db_blkid; 148fa9e4066Sahrens uint64_t hv = DBUF_HASH(os, obj, level, blkid); 149fa9e4066Sahrens uint64_t idx = hv & h->hash_table_mask; 150fa9e4066Sahrens dmu_buf_impl_t *dbf; 151fa9e4066Sahrens 152fa9e4066Sahrens mutex_enter(DBUF_HASH_MUTEX(h, idx)); 153fa9e4066Sahrens for (dbf = h->hash_table[idx]; dbf != NULL; dbf = dbf->db_hash_next) { 154fa9e4066Sahrens if (DBUF_EQUAL(dbf, os, obj, level, blkid)) { 155fa9e4066Sahrens mutex_enter(&dbf->db_mtx); 156ea8dc4b6Seschrock if (dbf->db_state != DB_EVICTING) { 157fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 158fa9e4066Sahrens return (dbf); 159fa9e4066Sahrens } 160fa9e4066Sahrens mutex_exit(&dbf->db_mtx); 161fa9e4066Sahrens } 162fa9e4066Sahrens } 163fa9e4066Sahrens 164fa9e4066Sahrens mutex_enter(&db->db_mtx); 165fa9e4066Sahrens db->db_hash_next = h->hash_table[idx]; 166fa9e4066Sahrens h->hash_table[idx] = db; 167fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 168fa9e4066Sahrens atomic_add_64(&dbuf_hash_count, 1); 169fa9e4066Sahrens 170fa9e4066Sahrens return (NULL); 171fa9e4066Sahrens } 172fa9e4066Sahrens 173fa9e4066Sahrens /* 174fa9e4066Sahrens * Remove an entry from the hash table. This operation will 175fa9e4066Sahrens * fail if there are any existing holds on the db. 176fa9e4066Sahrens */ 177fa9e4066Sahrens static void 178fa9e4066Sahrens dbuf_hash_remove(dmu_buf_impl_t *db) 179fa9e4066Sahrens { 180fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 181fa9e4066Sahrens uint64_t hv = DBUF_HASH(db->db_objset, db->db.db_object, 182fa9e4066Sahrens db->db_level, db->db_blkid); 183fa9e4066Sahrens uint64_t idx = hv & h->hash_table_mask; 184fa9e4066Sahrens dmu_buf_impl_t *dbf, **dbp; 185fa9e4066Sahrens 186fa9e4066Sahrens /* 187fa9e4066Sahrens * We musn't hold db_mtx to maintin lock ordering: 188fa9e4066Sahrens * DBUF_HASH_MUTEX > db_mtx. 189fa9e4066Sahrens */ 190fa9e4066Sahrens ASSERT(refcount_is_zero(&db->db_holds)); 191ea8dc4b6Seschrock ASSERT(db->db_state == DB_EVICTING); 192fa9e4066Sahrens ASSERT(!MUTEX_HELD(&db->db_mtx)); 193fa9e4066Sahrens 194fa9e4066Sahrens mutex_enter(DBUF_HASH_MUTEX(h, idx)); 195fa9e4066Sahrens dbp = &h->hash_table[idx]; 196fa9e4066Sahrens while ((dbf = *dbp) != db) { 197fa9e4066Sahrens dbp = &dbf->db_hash_next; 198fa9e4066Sahrens ASSERT(dbf != NULL); 199fa9e4066Sahrens } 200fa9e4066Sahrens *dbp = db->db_hash_next; 201fa9e4066Sahrens db->db_hash_next = NULL; 202fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 203fa9e4066Sahrens atomic_add_64(&dbuf_hash_count, -1); 204fa9e4066Sahrens } 205fa9e4066Sahrens 206ea8dc4b6Seschrock static arc_evict_func_t dbuf_do_evict; 207fa9e4066Sahrens 208fa9e4066Sahrens static void 209fa9e4066Sahrens dbuf_evict_user(dmu_buf_impl_t *db) 210fa9e4066Sahrens { 211fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 212fa9e4066Sahrens 213c717a561Smaybee if (db->db_level != 0 || db->db_evict_func == NULL) 214fa9e4066Sahrens return; 215fa9e4066Sahrens 216c717a561Smaybee if (db->db_user_data_ptr_ptr) 217c717a561Smaybee *db->db_user_data_ptr_ptr = db->db.db_data; 218c717a561Smaybee db->db_evict_func(&db->db, db->db_user_ptr); 219c717a561Smaybee db->db_user_ptr = NULL; 220c717a561Smaybee db->db_user_data_ptr_ptr = NULL; 221c717a561Smaybee db->db_evict_func = NULL; 222fa9e4066Sahrens } 223fa9e4066Sahrens 224744947dcSTom Erickson boolean_t 225744947dcSTom Erickson dbuf_is_metadata(dmu_buf_impl_t *db) 226744947dcSTom Erickson { 227744947dcSTom Erickson if (db->db_level > 0) { 228744947dcSTom Erickson return (B_TRUE); 229744947dcSTom Erickson } else { 230744947dcSTom Erickson boolean_t is_metadata; 231744947dcSTom Erickson 232744947dcSTom Erickson DB_DNODE_ENTER(db); 233ad135b5dSChristopher Siden is_metadata = DMU_OT_IS_METADATA(DB_DNODE(db)->dn_type); 234744947dcSTom Erickson DB_DNODE_EXIT(db); 235744947dcSTom Erickson 236744947dcSTom Erickson return (is_metadata); 237744947dcSTom Erickson } 238744947dcSTom Erickson } 239744947dcSTom Erickson 240ea8dc4b6Seschrock void 241ea8dc4b6Seschrock dbuf_evict(dmu_buf_impl_t *db) 242ea8dc4b6Seschrock { 243ea8dc4b6Seschrock ASSERT(MUTEX_HELD(&db->db_mtx)); 244ea8dc4b6Seschrock ASSERT(db->db_buf == NULL); 245c717a561Smaybee ASSERT(db->db_data_pending == NULL); 246ea8dc4b6Seschrock 247ea8dc4b6Seschrock dbuf_clear(db); 248ea8dc4b6Seschrock dbuf_destroy(db); 249ea8dc4b6Seschrock } 250ea8dc4b6Seschrock 251fa9e4066Sahrens void 252fa9e4066Sahrens dbuf_init(void) 253fa9e4066Sahrens { 254ea8dc4b6Seschrock uint64_t hsize = 1ULL << 16; 255fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 256fa9e4066Sahrens int i; 257fa9e4066Sahrens 258fa9e4066Sahrens /* 259fa9e4066Sahrens * The hash table is big enough to fill all of physical memory 260ea8dc4b6Seschrock * with an average 4K block size. The table will take up 261ea8dc4b6Seschrock * totalmem*sizeof(void*)/4K (i.e. 2MB/GB with 8-byte pointers). 262fa9e4066Sahrens */ 263ea8dc4b6Seschrock while (hsize * 4096 < physmem * PAGESIZE) 264fa9e4066Sahrens hsize <<= 1; 265fa9e4066Sahrens 266ea8dc4b6Seschrock retry: 267fa9e4066Sahrens h->hash_table_mask = hsize - 1; 268ea8dc4b6Seschrock h->hash_table = kmem_zalloc(hsize * sizeof (void *), KM_NOSLEEP); 269ea8dc4b6Seschrock if (h->hash_table == NULL) { 270ea8dc4b6Seschrock /* XXX - we should really return an error instead of assert */ 271ea8dc4b6Seschrock ASSERT(hsize > (1ULL << 10)); 272ea8dc4b6Seschrock hsize >>= 1; 273ea8dc4b6Seschrock goto retry; 274ea8dc4b6Seschrock } 275fa9e4066Sahrens 276fa9e4066Sahrens dbuf_cache = kmem_cache_create("dmu_buf_impl_t", 277fa9e4066Sahrens sizeof (dmu_buf_impl_t), 278fa9e4066Sahrens 0, dbuf_cons, dbuf_dest, NULL, NULL, NULL, 0); 279fa9e4066Sahrens 280fa9e4066Sahrens for (i = 0; i < DBUF_MUTEXES; i++) 281fa9e4066Sahrens mutex_init(&h->hash_mutexes[i], NULL, MUTEX_DEFAULT, NULL); 282fa9e4066Sahrens } 283fa9e4066Sahrens 284fa9e4066Sahrens void 285fa9e4066Sahrens dbuf_fini(void) 286fa9e4066Sahrens { 287fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 288fa9e4066Sahrens int i; 289fa9e4066Sahrens 290fa9e4066Sahrens for (i = 0; i < DBUF_MUTEXES; i++) 291fa9e4066Sahrens mutex_destroy(&h->hash_mutexes[i]); 292fa9e4066Sahrens kmem_free(h->hash_table, (h->hash_table_mask + 1) * sizeof (void *)); 293fa9e4066Sahrens kmem_cache_destroy(dbuf_cache); 294fa9e4066Sahrens } 295fa9e4066Sahrens 296fa9e4066Sahrens /* 297fa9e4066Sahrens * Other stuff. 298fa9e4066Sahrens */ 299fa9e4066Sahrens 3009c9dc39aSek #ifdef ZFS_DEBUG 301fa9e4066Sahrens static void 302fa9e4066Sahrens dbuf_verify(dmu_buf_impl_t *db) 303fa9e4066Sahrens { 304744947dcSTom Erickson dnode_t *dn; 305b24ab676SJeff Bonwick dbuf_dirty_record_t *dr; 306fa9e4066Sahrens 307fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 308fa9e4066Sahrens 309fa9e4066Sahrens if (!(zfs_flags & ZFS_DEBUG_DBUF_VERIFY)) 310fa9e4066Sahrens return; 311fa9e4066Sahrens 312fa9e4066Sahrens ASSERT(db->db_objset != NULL); 313744947dcSTom Erickson DB_DNODE_ENTER(db); 314744947dcSTom Erickson dn = DB_DNODE(db); 315fa9e4066Sahrens if (dn == NULL) { 316fa9e4066Sahrens ASSERT(db->db_parent == NULL); 317fa9e4066Sahrens ASSERT(db->db_blkptr == NULL); 318fa9e4066Sahrens } else { 319fa9e4066Sahrens ASSERT3U(db->db.db_object, ==, dn->dn_object); 320fa9e4066Sahrens ASSERT3P(db->db_objset, ==, dn->dn_objset); 321fa9e4066Sahrens ASSERT3U(db->db_level, <, dn->dn_nlevels); 322744947dcSTom Erickson ASSERT(db->db_blkid == DMU_BONUS_BLKID || 323744947dcSTom Erickson db->db_blkid == DMU_SPILL_BLKID || 324744947dcSTom Erickson !list_is_empty(&dn->dn_dbufs)); 325fa9e4066Sahrens } 3260a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 327fa9e4066Sahrens ASSERT(dn != NULL); 3281934e92fSmaybee ASSERT3U(db->db.db_size, >=, dn->dn_bonuslen); 3290a586ceaSMark Shellenbaum ASSERT3U(db->db.db_offset, ==, DMU_BONUS_BLKID); 3300a586ceaSMark Shellenbaum } else if (db->db_blkid == DMU_SPILL_BLKID) { 3310a586ceaSMark Shellenbaum ASSERT(dn != NULL); 3320a586ceaSMark Shellenbaum ASSERT3U(db->db.db_size, >=, dn->dn_bonuslen); 333fb09f5aaSMadhav Suresh ASSERT0(db->db.db_offset); 334fa9e4066Sahrens } else { 335fa9e4066Sahrens ASSERT3U(db->db.db_offset, ==, db->db_blkid * db->db.db_size); 336fa9e4066Sahrens } 337fa9e4066Sahrens 338b24ab676SJeff Bonwick for (dr = db->db_data_pending; dr != NULL; dr = dr->dr_next) 339b24ab676SJeff Bonwick ASSERT(dr->dr_dbuf == db); 340b24ab676SJeff Bonwick 341b24ab676SJeff Bonwick for (dr = db->db_last_dirty; dr != NULL; dr = dr->dr_next) 342b24ab676SJeff Bonwick ASSERT(dr->dr_dbuf == db); 343b24ab676SJeff Bonwick 34488b7b0f2SMatthew Ahrens /* 34588b7b0f2SMatthew Ahrens * We can't assert that db_size matches dn_datablksz because it 34688b7b0f2SMatthew Ahrens * can be momentarily different when another thread is doing 34788b7b0f2SMatthew Ahrens * dnode_set_blksz(). 34888b7b0f2SMatthew Ahrens */ 34988b7b0f2SMatthew Ahrens if (db->db_level == 0 && db->db.db_object == DMU_META_DNODE_OBJECT) { 350b24ab676SJeff Bonwick dr = db->db_data_pending; 35188b7b0f2SMatthew Ahrens /* 35288b7b0f2SMatthew Ahrens * It should only be modified in syncing context, so 35388b7b0f2SMatthew Ahrens * make sure we only have one copy of the data. 35488b7b0f2SMatthew Ahrens */ 35588b7b0f2SMatthew Ahrens ASSERT(dr == NULL || dr->dt.dl.dr_data == db->db_buf); 356fa9e4066Sahrens } 357fa9e4066Sahrens 358fa9e4066Sahrens /* verify db->db_blkptr */ 359fa9e4066Sahrens if (db->db_blkptr) { 360fa9e4066Sahrens if (db->db_parent == dn->dn_dbuf) { 361fa9e4066Sahrens /* db is pointed to by the dnode */ 362fa9e4066Sahrens /* ASSERT3U(db->db_blkid, <, dn->dn_nblkptr); */ 36314843421SMatthew Ahrens if (DMU_OBJECT_IS_SPECIAL(db->db.db_object)) 364fa9e4066Sahrens ASSERT(db->db_parent == NULL); 365fa9e4066Sahrens else 366fa9e4066Sahrens ASSERT(db->db_parent != NULL); 3670a586ceaSMark Shellenbaum if (db->db_blkid != DMU_SPILL_BLKID) 3680a586ceaSMark Shellenbaum ASSERT3P(db->db_blkptr, ==, 3690a586ceaSMark Shellenbaum &dn->dn_phys->dn_blkptr[db->db_blkid]); 370fa9e4066Sahrens } else { 371fa9e4066Sahrens /* db is pointed to by an indirect block */ 372fa9e4066Sahrens int epb = db->db_parent->db.db_size >> SPA_BLKPTRSHIFT; 373fa9e4066Sahrens ASSERT3U(db->db_parent->db_level, ==, db->db_level+1); 374fa9e4066Sahrens ASSERT3U(db->db_parent->db.db_object, ==, 375fa9e4066Sahrens db->db.db_object); 376fa9e4066Sahrens /* 377fa9e4066Sahrens * dnode_grow_indblksz() can make this fail if we don't 378fa9e4066Sahrens * have the struct_rwlock. XXX indblksz no longer 379fa9e4066Sahrens * grows. safe to do this now? 380fa9e4066Sahrens */ 381744947dcSTom Erickson if (RW_WRITE_HELD(&dn->dn_struct_rwlock)) { 382fa9e4066Sahrens ASSERT3P(db->db_blkptr, ==, 383fa9e4066Sahrens ((blkptr_t *)db->db_parent->db.db_data + 384fa9e4066Sahrens db->db_blkid % epb)); 385fa9e4066Sahrens } 386fa9e4066Sahrens } 387fa9e4066Sahrens } 388fa9e4066Sahrens if ((db->db_blkptr == NULL || BP_IS_HOLE(db->db_blkptr)) && 3893f9d6ad7SLin Ling (db->db_buf == NULL || db->db_buf->b_data) && 3900a586ceaSMark Shellenbaum db->db.db_data && db->db_blkid != DMU_BONUS_BLKID && 391fa9e4066Sahrens db->db_state != DB_FILL && !dn->dn_free_txg) { 392fa9e4066Sahrens /* 393fa9e4066Sahrens * If the blkptr isn't set but they have nonzero data, 394fa9e4066Sahrens * it had better be dirty, otherwise we'll lose that 395fa9e4066Sahrens * data when we evict this buffer. 396fa9e4066Sahrens */ 397fa9e4066Sahrens if (db->db_dirtycnt == 0) { 398fa9e4066Sahrens uint64_t *buf = db->db.db_data; 399fa9e4066Sahrens int i; 400fa9e4066Sahrens 401fa9e4066Sahrens for (i = 0; i < db->db.db_size >> 3; i++) { 402fa9e4066Sahrens ASSERT(buf[i] == 0); 403fa9e4066Sahrens } 404fa9e4066Sahrens } 405fa9e4066Sahrens } 406744947dcSTom Erickson DB_DNODE_EXIT(db); 407fa9e4066Sahrens } 4089c9dc39aSek #endif 409fa9e4066Sahrens 410fa9e4066Sahrens static void 411fa9e4066Sahrens dbuf_update_data(dmu_buf_impl_t *db) 412fa9e4066Sahrens { 413fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 414c717a561Smaybee if (db->db_level == 0 && db->db_user_data_ptr_ptr) { 415fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 416c717a561Smaybee *db->db_user_data_ptr_ptr = db->db.db_data; 417fa9e4066Sahrens } 418fa9e4066Sahrens } 419fa9e4066Sahrens 420fa9e4066Sahrens static void 421fa9e4066Sahrens dbuf_set_data(dmu_buf_impl_t *db, arc_buf_t *buf) 422fa9e4066Sahrens { 423fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 424ea8dc4b6Seschrock ASSERT(db->db_buf == NULL || !arc_has_callback(db->db_buf)); 425fa9e4066Sahrens db->db_buf = buf; 426ea8dc4b6Seschrock if (buf != NULL) { 427ea8dc4b6Seschrock ASSERT(buf->b_data != NULL); 428ea8dc4b6Seschrock db->db.db_data = buf->b_data; 429ea8dc4b6Seschrock if (!arc_released(buf)) 430ea8dc4b6Seschrock arc_set_callback(buf, dbuf_do_evict, db); 431ea8dc4b6Seschrock dbuf_update_data(db); 432ea8dc4b6Seschrock } else { 433ea8dc4b6Seschrock dbuf_evict_user(db); 434ea8dc4b6Seschrock db->db.db_data = NULL; 43582c9918fSTim Haley if (db->db_state != DB_NOFILL) 43682c9918fSTim Haley db->db_state = DB_UNCACHED; 437ea8dc4b6Seschrock } 438fa9e4066Sahrens } 439fa9e4066Sahrens 440c242f9a0Schunli zhang - Sun Microsystems - Irvine United States /* 441c242f9a0Schunli zhang - Sun Microsystems - Irvine United States * Loan out an arc_buf for read. Return the loaned arc_buf. 442c242f9a0Schunli zhang - Sun Microsystems - Irvine United States */ 443c242f9a0Schunli zhang - Sun Microsystems - Irvine United States arc_buf_t * 444c242f9a0Schunli zhang - Sun Microsystems - Irvine United States dbuf_loan_arcbuf(dmu_buf_impl_t *db) 445c242f9a0Schunli zhang - Sun Microsystems - Irvine United States { 446c242f9a0Schunli zhang - Sun Microsystems - Irvine United States arc_buf_t *abuf; 447c242f9a0Schunli zhang - Sun Microsystems - Irvine United States 448c242f9a0Schunli zhang - Sun Microsystems - Irvine United States mutex_enter(&db->db_mtx); 449c242f9a0Schunli zhang - Sun Microsystems - Irvine United States if (arc_released(db->db_buf) || refcount_count(&db->db_holds) > 1) { 450c242f9a0Schunli zhang - Sun Microsystems - Irvine United States int blksz = db->db.db_size; 451744947dcSTom Erickson spa_t *spa; 452744947dcSTom Erickson 453c242f9a0Schunli zhang - Sun Microsystems - Irvine United States mutex_exit(&db->db_mtx); 454744947dcSTom Erickson DB_GET_SPA(&spa, db); 455744947dcSTom Erickson abuf = arc_loan_buf(spa, blksz); 456c242f9a0Schunli zhang - Sun Microsystems - Irvine United States bcopy(db->db.db_data, abuf->b_data, blksz); 457c242f9a0Schunli zhang - Sun Microsystems - Irvine United States } else { 458c242f9a0Schunli zhang - Sun Microsystems - Irvine United States abuf = db->db_buf; 459c242f9a0Schunli zhang - Sun Microsystems - Irvine United States arc_loan_inuse_buf(abuf, db); 460c242f9a0Schunli zhang - Sun Microsystems - Irvine United States dbuf_set_data(db, NULL); 461c242f9a0Schunli zhang - Sun Microsystems - Irvine United States mutex_exit(&db->db_mtx); 462c242f9a0Schunli zhang - Sun Microsystems - Irvine United States } 463c242f9a0Schunli zhang - Sun Microsystems - Irvine United States return (abuf); 464c242f9a0Schunli zhang - Sun Microsystems - Irvine United States } 465c242f9a0Schunli zhang - Sun Microsystems - Irvine United States 466fa9e4066Sahrens uint64_t 467fa9e4066Sahrens dbuf_whichblock(dnode_t *dn, uint64_t offset) 468fa9e4066Sahrens { 469fa9e4066Sahrens if (dn->dn_datablkshift) { 470fa9e4066Sahrens return (offset >> dn->dn_datablkshift); 471fa9e4066Sahrens } else { 472fa9e4066Sahrens ASSERT3U(offset, <, dn->dn_datablksz); 473fa9e4066Sahrens return (0); 474fa9e4066Sahrens } 475fa9e4066Sahrens } 476fa9e4066Sahrens 477fa9e4066Sahrens static void 478fa9e4066Sahrens dbuf_read_done(zio_t *zio, arc_buf_t *buf, void *vdb) 479fa9e4066Sahrens { 480fa9e4066Sahrens dmu_buf_impl_t *db = vdb; 481fa9e4066Sahrens 482fa9e4066Sahrens mutex_enter(&db->db_mtx); 483fa9e4066Sahrens ASSERT3U(db->db_state, ==, DB_READ); 484fa9e4066Sahrens /* 485fa9e4066Sahrens * All reads are synchronous, so we must have a hold on the dbuf 486fa9e4066Sahrens */ 487fa9e4066Sahrens ASSERT(refcount_count(&db->db_holds) > 0); 488ea8dc4b6Seschrock ASSERT(db->db_buf == NULL); 489fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 490c717a561Smaybee if (db->db_level == 0 && db->db_freed_in_flight) { 491fa9e4066Sahrens /* we were freed in flight; disregard any error */ 492fa9e4066Sahrens arc_release(buf, db); 493fa9e4066Sahrens bzero(buf->b_data, db->db.db_size); 4946b4acc8bSahrens arc_buf_freeze(buf); 495c717a561Smaybee db->db_freed_in_flight = FALSE; 496fa9e4066Sahrens dbuf_set_data(db, buf); 497fa9e4066Sahrens db->db_state = DB_CACHED; 498fa9e4066Sahrens } else if (zio == NULL || zio->io_error == 0) { 499fa9e4066Sahrens dbuf_set_data(db, buf); 500fa9e4066Sahrens db->db_state = DB_CACHED; 501fa9e4066Sahrens } else { 5020a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 503fa9e4066Sahrens ASSERT3P(db->db_buf, ==, NULL); 5043b2aab18SMatthew Ahrens VERIFY(arc_buf_remove_ref(buf, db)); 505ea8dc4b6Seschrock db->db_state = DB_UNCACHED; 506fa9e4066Sahrens } 507fa9e4066Sahrens cv_broadcast(&db->db_changed); 5083f9d6ad7SLin Ling dbuf_rele_and_unlock(db, NULL); 509fa9e4066Sahrens } 510fa9e4066Sahrens 511ea8dc4b6Seschrock static void 51213506d1eSmaybee dbuf_read_impl(dmu_buf_impl_t *db, zio_t *zio, uint32_t *flags) 513fa9e4066Sahrens { 514744947dcSTom Erickson dnode_t *dn; 515744947dcSTom Erickson spa_t *spa; 516ea8dc4b6Seschrock zbookmark_t zb; 51713506d1eSmaybee uint32_t aflags = ARC_NOWAIT; 518fa9e4066Sahrens 519744947dcSTom Erickson DB_DNODE_ENTER(db); 520744947dcSTom Erickson dn = DB_DNODE(db); 521fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 522fa9e4066Sahrens /* We need the struct_rwlock to prevent db_blkptr from changing. */ 523088f3894Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 524ea8dc4b6Seschrock ASSERT(MUTEX_HELD(&db->db_mtx)); 525ea8dc4b6Seschrock ASSERT(db->db_state == DB_UNCACHED); 526ea8dc4b6Seschrock ASSERT(db->db_buf == NULL); 527fa9e4066Sahrens 5280a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 529cf04dda1SMark Maybee int bonuslen = MIN(dn->dn_bonuslen, dn->dn_phys->dn_bonuslen); 5301934e92fSmaybee 5311934e92fSmaybee ASSERT3U(bonuslen, <=, db->db.db_size); 532ea8dc4b6Seschrock db->db.db_data = zio_buf_alloc(DN_MAX_BONUSLEN); 5335a98e54bSBrendan Gregg - Sun Microsystems arc_space_consume(DN_MAX_BONUSLEN, ARC_SPACE_OTHER); 5341934e92fSmaybee if (bonuslen < DN_MAX_BONUSLEN) 535ea8dc4b6Seschrock bzero(db->db.db_data, DN_MAX_BONUSLEN); 536cf04dda1SMark Maybee if (bonuslen) 537cf04dda1SMark Maybee bcopy(DN_BONUS(dn->dn_phys), db->db.db_data, bonuslen); 538744947dcSTom Erickson DB_DNODE_EXIT(db); 539ea8dc4b6Seschrock dbuf_update_data(db); 540fa9e4066Sahrens db->db_state = DB_CACHED; 541fa9e4066Sahrens mutex_exit(&db->db_mtx); 542fa9e4066Sahrens return; 543fa9e4066Sahrens } 544fa9e4066Sahrens 5451c8564a7SMark Maybee /* 5461c8564a7SMark Maybee * Recheck BP_IS_HOLE() after dnode_block_freed() in case dnode_sync() 5471c8564a7SMark Maybee * processes the delete record and clears the bp while we are waiting 5481c8564a7SMark Maybee * for the dn_mtx (resulting in a "no" from block_freed). 5491c8564a7SMark Maybee */ 550088f3894Sahrens if (db->db_blkptr == NULL || BP_IS_HOLE(db->db_blkptr) || 5511c8564a7SMark Maybee (db->db_level == 0 && (dnode_block_freed(dn, db->db_blkid) || 5521c8564a7SMark Maybee BP_IS_HOLE(db->db_blkptr)))) { 553ad23a2dbSjohansen arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 554ad23a2dbSjohansen 555088f3894Sahrens dbuf_set_data(db, arc_buf_alloc(dn->dn_objset->os_spa, 556ad23a2dbSjohansen db->db.db_size, db, type)); 557744947dcSTom Erickson DB_DNODE_EXIT(db); 558fa9e4066Sahrens bzero(db->db.db_data, db->db.db_size); 559fa9e4066Sahrens db->db_state = DB_CACHED; 56013506d1eSmaybee *flags |= DB_RF_CACHED; 561fa9e4066Sahrens mutex_exit(&db->db_mtx); 562fa9e4066Sahrens return; 563fa9e4066Sahrens } 564fa9e4066Sahrens 565744947dcSTom Erickson spa = dn->dn_objset->os_spa; 566744947dcSTom Erickson DB_DNODE_EXIT(db); 567744947dcSTom Erickson 568fa9e4066Sahrens db->db_state = DB_READ; 569fa9e4066Sahrens mutex_exit(&db->db_mtx); 570fa9e4066Sahrens 5713baa08fcSek if (DBUF_IS_L2CACHEABLE(db)) 5723baa08fcSek aflags |= ARC_L2CACHE; 573aad02571SSaso Kiselkov if (DBUF_IS_L2COMPRESSIBLE(db)) 574aad02571SSaso Kiselkov aflags |= ARC_L2COMPRESS; 5753baa08fcSek 576b24ab676SJeff Bonwick SET_BOOKMARK(&zb, db->db_objset->os_dsl_dataset ? 577b24ab676SJeff Bonwick db->db_objset->os_dsl_dataset->ds_object : DMU_META_OBJSET, 578b24ab676SJeff Bonwick db->db.db_object, db->db_level, db->db_blkid); 579ea8dc4b6Seschrock 580ea8dc4b6Seschrock dbuf_add_ref(db, NULL); 581088f3894Sahrens 5821b912ec7SGeorge Wilson (void) arc_read(zio, spa, db->db_blkptr, 583fa9e4066Sahrens dbuf_read_done, db, ZIO_PRIORITY_SYNC_READ, 58413506d1eSmaybee (*flags & DB_RF_CANFAIL) ? ZIO_FLAG_CANFAIL : ZIO_FLAG_MUSTSUCCEED, 58513506d1eSmaybee &aflags, &zb); 58613506d1eSmaybee if (aflags & ARC_CACHED) 58713506d1eSmaybee *flags |= DB_RF_CACHED; 588fa9e4066Sahrens } 589fa9e4066Sahrens 590ea8dc4b6Seschrock int 591ea8dc4b6Seschrock dbuf_read(dmu_buf_impl_t *db, zio_t *zio, uint32_t flags) 592fa9e4066Sahrens { 593ea8dc4b6Seschrock int err = 0; 594ea8dc4b6Seschrock int havepzio = (zio != NULL); 59513506d1eSmaybee int prefetch; 596744947dcSTom Erickson dnode_t *dn; 597fa9e4066Sahrens 598fa9e4066Sahrens /* 599fa9e4066Sahrens * We don't have to hold the mutex to check db_state because it 600fa9e4066Sahrens * can't be freed while we have a hold on the buffer. 601fa9e4066Sahrens */ 602fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 603fa9e4066Sahrens 60482c9918fSTim Haley if (db->db_state == DB_NOFILL) 605be6fd75aSMatthew Ahrens return (SET_ERROR(EIO)); 60682c9918fSTim Haley 607744947dcSTom Erickson DB_DNODE_ENTER(db); 608744947dcSTom Erickson dn = DB_DNODE(db); 609ea8dc4b6Seschrock if ((flags & DB_RF_HAVESTRUCT) == 0) 610744947dcSTom Erickson rw_enter(&dn->dn_struct_rwlock, RW_READER); 611ea8dc4b6Seschrock 6120a586ceaSMark Shellenbaum prefetch = db->db_level == 0 && db->db_blkid != DMU_BONUS_BLKID && 613744947dcSTom Erickson (flags & DB_RF_NOPREFETCH) == 0 && dn != NULL && 6143baa08fcSek DBUF_IS_CACHEABLE(db); 61513506d1eSmaybee 616ea8dc4b6Seschrock mutex_enter(&db->db_mtx); 617ea8dc4b6Seschrock if (db->db_state == DB_CACHED) { 618ea8dc4b6Seschrock mutex_exit(&db->db_mtx); 61913506d1eSmaybee if (prefetch) 620744947dcSTom Erickson dmu_zfetch(&dn->dn_zfetch, db->db.db_offset, 62113506d1eSmaybee db->db.db_size, TRUE); 622fa9e4066Sahrens if ((flags & DB_RF_HAVESTRUCT) == 0) 623744947dcSTom Erickson rw_exit(&dn->dn_struct_rwlock); 624744947dcSTom Erickson DB_DNODE_EXIT(db); 625ea8dc4b6Seschrock } else if (db->db_state == DB_UNCACHED) { 626744947dcSTom Erickson spa_t *spa = dn->dn_objset->os_spa; 627744947dcSTom Erickson 628744947dcSTom Erickson if (zio == NULL) 629744947dcSTom Erickson zio = zio_root(spa, NULL, NULL, ZIO_FLAG_CANFAIL); 63013506d1eSmaybee dbuf_read_impl(db, zio, &flags); 63113506d1eSmaybee 632ea8dc4b6Seschrock /* dbuf_read_impl has dropped db_mtx for us */ 633ea8dc4b6Seschrock 63413506d1eSmaybee if (prefetch) 635744947dcSTom Erickson dmu_zfetch(&dn->dn_zfetch, db->db.db_offset, 63613506d1eSmaybee db->db.db_size, flags & DB_RF_CACHED); 637ea8dc4b6Seschrock 638fa9e4066Sahrens if ((flags & DB_RF_HAVESTRUCT) == 0) 639744947dcSTom Erickson rw_exit(&dn->dn_struct_rwlock); 640744947dcSTom Erickson DB_DNODE_EXIT(db); 641fa9e4066Sahrens 642ea8dc4b6Seschrock if (!havepzio) 643ea8dc4b6Seschrock err = zio_wait(zio); 644ea8dc4b6Seschrock } else { 6453e30c24aSWill Andrews /* 6463e30c24aSWill Andrews * Another reader came in while the dbuf was in flight 6473e30c24aSWill Andrews * between UNCACHED and CACHED. Either a writer will finish 6483e30c24aSWill Andrews * writing the buffer (sending the dbuf to CACHED) or the 6493e30c24aSWill Andrews * first reader's request will reach the read_done callback 6503e30c24aSWill Andrews * and send the dbuf to CACHED. Otherwise, a failure 6513e30c24aSWill Andrews * occurred and the dbuf went to UNCACHED. 6523e30c24aSWill Andrews */ 65313506d1eSmaybee mutex_exit(&db->db_mtx); 65413506d1eSmaybee if (prefetch) 655744947dcSTom Erickson dmu_zfetch(&dn->dn_zfetch, db->db.db_offset, 65613506d1eSmaybee db->db.db_size, TRUE); 657ea8dc4b6Seschrock if ((flags & DB_RF_HAVESTRUCT) == 0) 658744947dcSTom Erickson rw_exit(&dn->dn_struct_rwlock); 659744947dcSTom Erickson DB_DNODE_EXIT(db); 66013506d1eSmaybee 6613e30c24aSWill Andrews /* Skip the wait per the caller's request. */ 66213506d1eSmaybee mutex_enter(&db->db_mtx); 663ea8dc4b6Seschrock if ((flags & DB_RF_NEVERWAIT) == 0) { 664ea8dc4b6Seschrock while (db->db_state == DB_READ || 665ea8dc4b6Seschrock db->db_state == DB_FILL) { 666ea8dc4b6Seschrock ASSERT(db->db_state == DB_READ || 667ea8dc4b6Seschrock (flags & DB_RF_HAVESTRUCT) == 0); 668ea8dc4b6Seschrock cv_wait(&db->db_changed, &db->db_mtx); 669ea8dc4b6Seschrock } 670ea8dc4b6Seschrock if (db->db_state == DB_UNCACHED) 671be6fd75aSMatthew Ahrens err = SET_ERROR(EIO); 672ea8dc4b6Seschrock } 673ea8dc4b6Seschrock mutex_exit(&db->db_mtx); 674fa9e4066Sahrens } 675fa9e4066Sahrens 676ea8dc4b6Seschrock ASSERT(err || havepzio || db->db_state == DB_CACHED); 677ea8dc4b6Seschrock return (err); 678fa9e4066Sahrens } 679fa9e4066Sahrens 680fa9e4066Sahrens static void 681fa9e4066Sahrens dbuf_noread(dmu_buf_impl_t *db) 682fa9e4066Sahrens { 683fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 6840a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 685fa9e4066Sahrens mutex_enter(&db->db_mtx); 686fa9e4066Sahrens while (db->db_state == DB_READ || db->db_state == DB_FILL) 687fa9e4066Sahrens cv_wait(&db->db_changed, &db->db_mtx); 688fa9e4066Sahrens if (db->db_state == DB_UNCACHED) { 689ad23a2dbSjohansen arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 690744947dcSTom Erickson spa_t *spa; 691ad23a2dbSjohansen 692ea8dc4b6Seschrock ASSERT(db->db_buf == NULL); 693fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 694744947dcSTom Erickson DB_GET_SPA(&spa, db); 695744947dcSTom Erickson dbuf_set_data(db, arc_buf_alloc(spa, db->db.db_size, db, type)); 696fa9e4066Sahrens db->db_state = DB_FILL; 69782c9918fSTim Haley } else if (db->db_state == DB_NOFILL) { 69882c9918fSTim Haley dbuf_set_data(db, NULL); 699fa9e4066Sahrens } else { 700fa9e4066Sahrens ASSERT3U(db->db_state, ==, DB_CACHED); 701fa9e4066Sahrens } 702fa9e4066Sahrens mutex_exit(&db->db_mtx); 703fa9e4066Sahrens } 704fa9e4066Sahrens 705fa9e4066Sahrens /* 706fa9e4066Sahrens * This is our just-in-time copy function. It makes a copy of 707fa9e4066Sahrens * buffers, that have been modified in a previous transaction 708fa9e4066Sahrens * group, before we modify them in the current active group. 709fa9e4066Sahrens * 710fa9e4066Sahrens * This function is used in two places: when we are dirtying a 711fa9e4066Sahrens * buffer for the first time in a txg, and when we are freeing 712fa9e4066Sahrens * a range in a dnode that includes this buffer. 713fa9e4066Sahrens * 714fa9e4066Sahrens * Note that when we are called from dbuf_free_range() we do 715fa9e4066Sahrens * not put a hold on the buffer, we just traverse the active 716fa9e4066Sahrens * dbuf list for the dnode. 717fa9e4066Sahrens */ 718fa9e4066Sahrens static void 719fa9e4066Sahrens dbuf_fix_old_data(dmu_buf_impl_t *db, uint64_t txg) 720fa9e4066Sahrens { 721c717a561Smaybee dbuf_dirty_record_t *dr = db->db_last_dirty; 722fa9e4066Sahrens 723fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 724fa9e4066Sahrens ASSERT(db->db.db_data != NULL); 725c717a561Smaybee ASSERT(db->db_level == 0); 726c717a561Smaybee ASSERT(db->db.db_object != DMU_META_DNODE_OBJECT); 727fa9e4066Sahrens 7284d31c452Smaybee if (dr == NULL || 7294d31c452Smaybee (dr->dt.dl.dr_data != 7300a586ceaSMark Shellenbaum ((db->db_blkid == DMU_BONUS_BLKID) ? db->db.db_data : db->db_buf))) 731fa9e4066Sahrens return; 732fa9e4066Sahrens 733fa9e4066Sahrens /* 734c717a561Smaybee * If the last dirty record for this dbuf has not yet synced 735c717a561Smaybee * and its referencing the dbuf data, either: 736744947dcSTom Erickson * reset the reference to point to a new copy, 737c717a561Smaybee * or (if there a no active holders) 738c717a561Smaybee * just null out the current db_data pointer. 739fa9e4066Sahrens */ 740c717a561Smaybee ASSERT(dr->dr_txg >= txg - 2); 7410a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 742c717a561Smaybee /* Note that the data bufs here are zio_bufs */ 743c717a561Smaybee dr->dt.dl.dr_data = zio_buf_alloc(DN_MAX_BONUSLEN); 7445a98e54bSBrendan Gregg - Sun Microsystems arc_space_consume(DN_MAX_BONUSLEN, ARC_SPACE_OTHER); 745c717a561Smaybee bcopy(db->db.db_data, dr->dt.dl.dr_data, DN_MAX_BONUSLEN); 746c717a561Smaybee } else if (refcount_count(&db->db_holds) > db->db_dirtycnt) { 747c717a561Smaybee int size = db->db.db_size; 748c717a561Smaybee arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 749744947dcSTom Erickson spa_t *spa; 750744947dcSTom Erickson 751744947dcSTom Erickson DB_GET_SPA(&spa, db); 752744947dcSTom Erickson dr->dt.dl.dr_data = arc_buf_alloc(spa, size, db, type); 753c717a561Smaybee bcopy(db->db.db_data, dr->dt.dl.dr_data->b_data, size); 754c717a561Smaybee } else { 755c717a561Smaybee dbuf_set_data(db, NULL); 756fa9e4066Sahrens } 757fa9e4066Sahrens } 758fa9e4066Sahrens 759c717a561Smaybee void 760c717a561Smaybee dbuf_unoverride(dbuf_dirty_record_t *dr) 761ea8dc4b6Seschrock { 762c717a561Smaybee dmu_buf_impl_t *db = dr->dr_dbuf; 763b24ab676SJeff Bonwick blkptr_t *bp = &dr->dt.dl.dr_overridden_by; 764c717a561Smaybee uint64_t txg = dr->dr_txg; 765ea8dc4b6Seschrock 766ea8dc4b6Seschrock ASSERT(MUTEX_HELD(&db->db_mtx)); 767c717a561Smaybee ASSERT(dr->dt.dl.dr_override_state != DR_IN_DMU_SYNC); 768c717a561Smaybee ASSERT(db->db_level == 0); 769ea8dc4b6Seschrock 7700a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID || 771c717a561Smaybee dr->dt.dl.dr_override_state == DR_NOT_OVERRIDDEN) 772c717a561Smaybee return; 773ea8dc4b6Seschrock 774b24ab676SJeff Bonwick ASSERT(db->db_data_pending != dr); 775b24ab676SJeff Bonwick 776c717a561Smaybee /* free this block */ 77780901aeaSGeorge Wilson if (!BP_IS_HOLE(bp) && !dr->dt.dl.dr_nopwrite) { 778744947dcSTom Erickson spa_t *spa; 779b24ab676SJeff Bonwick 780744947dcSTom Erickson DB_GET_SPA(&spa, db); 781744947dcSTom Erickson zio_free(spa, txg, bp); 782744947dcSTom Erickson } 783c717a561Smaybee dr->dt.dl.dr_override_state = DR_NOT_OVERRIDDEN; 78480901aeaSGeorge Wilson dr->dt.dl.dr_nopwrite = B_FALSE; 78580901aeaSGeorge Wilson 786c717a561Smaybee /* 787c717a561Smaybee * Release the already-written buffer, so we leave it in 788c717a561Smaybee * a consistent dirty state. Note that all callers are 789c717a561Smaybee * modifying the buffer, so they will immediately do 790c717a561Smaybee * another (redundant) arc_release(). Therefore, leave 791c717a561Smaybee * the buf thawed to save the effort of freezing & 792c717a561Smaybee * immediately re-thawing it. 793c717a561Smaybee */ 794c717a561Smaybee arc_release(dr->dt.dl.dr_data, db); 795fa9e4066Sahrens } 796fa9e4066Sahrens 797cdb0ab79Smaybee /* 798cdb0ab79Smaybee * Evict (if its unreferenced) or clear (if its referenced) any level-0 799cdb0ab79Smaybee * data blocks in the free range, so that any future readers will find 800*2f3d8780SMatthew Ahrens * empty blocks. Also, if we happen across any level-1 dbufs in the 801cdb0ab79Smaybee * range that have not already been marked dirty, mark them dirty so 802cdb0ab79Smaybee * they stay in memory. 803*2f3d8780SMatthew Ahrens * 804*2f3d8780SMatthew Ahrens * This is a no-op if the dataset is in the middle of an incremental 805*2f3d8780SMatthew Ahrens * receive; see comment below for details. 806cdb0ab79Smaybee */ 807fa9e4066Sahrens void 808cdb0ab79Smaybee dbuf_free_range(dnode_t *dn, uint64_t start, uint64_t end, dmu_tx_t *tx) 809fa9e4066Sahrens { 810fa9e4066Sahrens dmu_buf_impl_t *db, *db_next; 811fa9e4066Sahrens uint64_t txg = tx->tx_txg; 812cdb0ab79Smaybee int epbs = dn->dn_indblkshift - SPA_BLKPTRSHIFT; 813cdb0ab79Smaybee uint64_t first_l1 = start >> epbs; 814cdb0ab79Smaybee uint64_t last_l1 = end >> epbs; 815fa9e4066Sahrens 8160a586ceaSMark Shellenbaum if (end > dn->dn_maxblkid && (end != DMU_SPILL_BLKID)) { 817cdb0ab79Smaybee end = dn->dn_maxblkid; 818cdb0ab79Smaybee last_l1 = end >> epbs; 819cdb0ab79Smaybee } 820cdb0ab79Smaybee dprintf_dnode(dn, "start=%llu end=%llu\n", start, end); 821*2f3d8780SMatthew Ahrens 822*2f3d8780SMatthew Ahrens if (dmu_objset_is_receiving(dn->dn_objset)) { 823*2f3d8780SMatthew Ahrens /* 824*2f3d8780SMatthew Ahrens * When processing a free record from a zfs receive, 825*2f3d8780SMatthew Ahrens * there should have been no previous modifications to the 826*2f3d8780SMatthew Ahrens * data in this range. Therefore there should be no dbufs 827*2f3d8780SMatthew Ahrens * in the range. Searching dn_dbufs for these non-existent 828*2f3d8780SMatthew Ahrens * dbufs can be very expensive, so simply ignore this. 829*2f3d8780SMatthew Ahrens */ 830*2f3d8780SMatthew Ahrens VERIFY3P(dbuf_find(dn, 0, start), ==, NULL); 831*2f3d8780SMatthew Ahrens VERIFY3P(dbuf_find(dn, 0, end), ==, NULL); 832*2f3d8780SMatthew Ahrens return; 833*2f3d8780SMatthew Ahrens } 834*2f3d8780SMatthew Ahrens 835fa9e4066Sahrens mutex_enter(&dn->dn_dbufs_mtx); 836fa9e4066Sahrens for (db = list_head(&dn->dn_dbufs); db; db = db_next) { 837fa9e4066Sahrens db_next = list_next(&dn->dn_dbufs, db); 8380a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 839cdb0ab79Smaybee 840cdb0ab79Smaybee if (db->db_level == 1 && 841cdb0ab79Smaybee db->db_blkid >= first_l1 && db->db_blkid <= last_l1) { 842cdb0ab79Smaybee mutex_enter(&db->db_mtx); 843cdb0ab79Smaybee if (db->db_last_dirty && 844cdb0ab79Smaybee db->db_last_dirty->dr_txg < txg) { 845cdb0ab79Smaybee dbuf_add_ref(db, FTAG); 846cdb0ab79Smaybee mutex_exit(&db->db_mtx); 847cdb0ab79Smaybee dbuf_will_dirty(db, tx); 848cdb0ab79Smaybee dbuf_rele(db, FTAG); 849cdb0ab79Smaybee } else { 850cdb0ab79Smaybee mutex_exit(&db->db_mtx); 851cdb0ab79Smaybee } 852cdb0ab79Smaybee } 853cdb0ab79Smaybee 854ea8dc4b6Seschrock if (db->db_level != 0) 855fa9e4066Sahrens continue; 856fa9e4066Sahrens dprintf_dbuf(db, "found buf %s\n", ""); 857cdb0ab79Smaybee if (db->db_blkid < start || db->db_blkid > end) 858fa9e4066Sahrens continue; 859fa9e4066Sahrens 860fa9e4066Sahrens /* found a level 0 buffer in the range */ 8613b2aab18SMatthew Ahrens mutex_enter(&db->db_mtx); 8623b2aab18SMatthew Ahrens if (dbuf_undirty(db, tx)) { 8633b2aab18SMatthew Ahrens /* mutex has been dropped and dbuf destroyed */ 864fa9e4066Sahrens continue; 8653b2aab18SMatthew Ahrens } 866fa9e4066Sahrens 867ea8dc4b6Seschrock if (db->db_state == DB_UNCACHED || 86882c9918fSTim Haley db->db_state == DB_NOFILL || 869ea8dc4b6Seschrock db->db_state == DB_EVICTING) { 870fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 871fa9e4066Sahrens mutex_exit(&db->db_mtx); 872fa9e4066Sahrens continue; 873fa9e4066Sahrens } 874c543ec06Sahrens if (db->db_state == DB_READ || db->db_state == DB_FILL) { 875c543ec06Sahrens /* will be handled in dbuf_read_done or dbuf_rele */ 876c717a561Smaybee db->db_freed_in_flight = TRUE; 877fa9e4066Sahrens mutex_exit(&db->db_mtx); 878fa9e4066Sahrens continue; 879fa9e4066Sahrens } 880ea8dc4b6Seschrock if (refcount_count(&db->db_holds) == 0) { 881ea8dc4b6Seschrock ASSERT(db->db_buf); 882ea8dc4b6Seschrock dbuf_clear(db); 883ea8dc4b6Seschrock continue; 884ea8dc4b6Seschrock } 885c717a561Smaybee /* The dbuf is referenced */ 886fa9e4066Sahrens 887c717a561Smaybee if (db->db_last_dirty != NULL) { 888c717a561Smaybee dbuf_dirty_record_t *dr = db->db_last_dirty; 889c717a561Smaybee 890c717a561Smaybee if (dr->dr_txg == txg) { 89144eda4d7Smaybee /* 892c717a561Smaybee * This buffer is "in-use", re-adjust the file 893c717a561Smaybee * size to reflect that this buffer may 894c717a561Smaybee * contain new data when we sync. 89544eda4d7Smaybee */ 89606e0070dSMark Shellenbaum if (db->db_blkid != DMU_SPILL_BLKID && 89706e0070dSMark Shellenbaum db->db_blkid > dn->dn_maxblkid) 898c717a561Smaybee dn->dn_maxblkid = db->db_blkid; 899c717a561Smaybee dbuf_unoverride(dr); 900c717a561Smaybee } else { 901c717a561Smaybee /* 902c717a561Smaybee * This dbuf is not dirty in the open context. 903c717a561Smaybee * Either uncache it (if its not referenced in 904c717a561Smaybee * the open context) or reset its contents to 905c717a561Smaybee * empty. 906c717a561Smaybee */ 907c717a561Smaybee dbuf_fix_old_data(db, txg); 90844eda4d7Smaybee } 909ea8dc4b6Seschrock } 910c717a561Smaybee /* clear the contents if its cached */ 911ea8dc4b6Seschrock if (db->db_state == DB_CACHED) { 912ea8dc4b6Seschrock ASSERT(db->db.db_data != NULL); 913fa9e4066Sahrens arc_release(db->db_buf, db); 914fa9e4066Sahrens bzero(db->db.db_data, db->db.db_size); 9156b4acc8bSahrens arc_buf_freeze(db->db_buf); 916fa9e4066Sahrens } 917ea8dc4b6Seschrock 918fa9e4066Sahrens mutex_exit(&db->db_mtx); 919fa9e4066Sahrens } 920fa9e4066Sahrens mutex_exit(&dn->dn_dbufs_mtx); 921fa9e4066Sahrens } 922fa9e4066Sahrens 923fa9e4066Sahrens static int 9241934e92fSmaybee dbuf_block_freeable(dmu_buf_impl_t *db) 925fa9e4066Sahrens { 926fa9e4066Sahrens dsl_dataset_t *ds = db->db_objset->os_dsl_dataset; 927fa9e4066Sahrens uint64_t birth_txg = 0; 928fa9e4066Sahrens 929fa9e4066Sahrens /* 930fa9e4066Sahrens * We don't need any locking to protect db_blkptr: 931c717a561Smaybee * If it's syncing, then db_last_dirty will be set 932c717a561Smaybee * so we'll ignore db_blkptr. 933fa9e4066Sahrens */ 934c717a561Smaybee ASSERT(MUTEX_HELD(&db->db_mtx)); 935c717a561Smaybee if (db->db_last_dirty) 936c717a561Smaybee birth_txg = db->db_last_dirty->dr_txg; 937fa9e4066Sahrens else if (db->db_blkptr) 938fa9e4066Sahrens birth_txg = db->db_blkptr->blk_birth; 939fa9e4066Sahrens 940837b568bSGeorge Wilson /* 941837b568bSGeorge Wilson * If we don't exist or are in a snapshot, we can't be freed. 942837b568bSGeorge Wilson * Don't pass the bp to dsl_dataset_block_freeable() since we 943837b568bSGeorge Wilson * are holding the db_mtx lock and might deadlock if we are 944837b568bSGeorge Wilson * prefetching a dedup-ed block. 945837b568bSGeorge Wilson */ 946fa9e4066Sahrens if (birth_txg) 9471934e92fSmaybee return (ds == NULL || 948837b568bSGeorge Wilson dsl_dataset_block_freeable(ds, NULL, birth_txg)); 949fa9e4066Sahrens else 9501934e92fSmaybee return (FALSE); 951fa9e4066Sahrens } 952fa9e4066Sahrens 953fa9e4066Sahrens void 954fa9e4066Sahrens dbuf_new_size(dmu_buf_impl_t *db, int size, dmu_tx_t *tx) 955fa9e4066Sahrens { 956fa9e4066Sahrens arc_buf_t *buf, *obuf; 957fa9e4066Sahrens int osize = db->db.db_size; 958ad23a2dbSjohansen arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 959744947dcSTom Erickson dnode_t *dn; 960fa9e4066Sahrens 9610a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 962ea8dc4b6Seschrock 963744947dcSTom Erickson DB_DNODE_ENTER(db); 964744947dcSTom Erickson dn = DB_DNODE(db); 965744947dcSTom Erickson 966fa9e4066Sahrens /* XXX does *this* func really need the lock? */ 967744947dcSTom Erickson ASSERT(RW_WRITE_HELD(&dn->dn_struct_rwlock)); 968fa9e4066Sahrens 969fa9e4066Sahrens /* 970fa9e4066Sahrens * This call to dbuf_will_dirty() with the dn_struct_rwlock held 971fa9e4066Sahrens * is OK, because there can be no other references to the db 972fa9e4066Sahrens * when we are changing its size, so no concurrent DB_FILL can 973fa9e4066Sahrens * be happening. 974fa9e4066Sahrens */ 975ea8dc4b6Seschrock /* 976ea8dc4b6Seschrock * XXX we should be doing a dbuf_read, checking the return 977ea8dc4b6Seschrock * value and returning that up to our callers 978ea8dc4b6Seschrock */ 979fa9e4066Sahrens dbuf_will_dirty(db, tx); 980fa9e4066Sahrens 981fa9e4066Sahrens /* create the data buffer for the new block */ 982744947dcSTom Erickson buf = arc_buf_alloc(dn->dn_objset->os_spa, size, db, type); 983fa9e4066Sahrens 984fa9e4066Sahrens /* copy old block data to the new block */ 985fa9e4066Sahrens obuf = db->db_buf; 986f65e61c0Sahrens bcopy(obuf->b_data, buf->b_data, MIN(osize, size)); 987fa9e4066Sahrens /* zero the remainder */ 988f65e61c0Sahrens if (size > osize) 989f65e61c0Sahrens bzero((uint8_t *)buf->b_data + osize, size - osize); 990fa9e4066Sahrens 991fa9e4066Sahrens mutex_enter(&db->db_mtx); 992fa9e4066Sahrens dbuf_set_data(db, buf); 9933b2aab18SMatthew Ahrens VERIFY(arc_buf_remove_ref(obuf, db)); 994fa9e4066Sahrens db->db.db_size = size; 995fa9e4066Sahrens 996c717a561Smaybee if (db->db_level == 0) { 997c717a561Smaybee ASSERT3U(db->db_last_dirty->dr_txg, ==, tx->tx_txg); 998c717a561Smaybee db->db_last_dirty->dt.dl.dr_data = buf; 999c717a561Smaybee } 1000fa9e4066Sahrens mutex_exit(&db->db_mtx); 1001fa9e4066Sahrens 1002744947dcSTom Erickson dnode_willuse_space(dn, size-osize, tx); 1003744947dcSTom Erickson DB_DNODE_EXIT(db); 1004fa9e4066Sahrens } 1005fa9e4066Sahrens 10063f9d6ad7SLin Ling void 10073f9d6ad7SLin Ling dbuf_release_bp(dmu_buf_impl_t *db) 10083f9d6ad7SLin Ling { 1009744947dcSTom Erickson objset_t *os; 10103f9d6ad7SLin Ling 1011744947dcSTom Erickson DB_GET_OBJSET(&os, db); 10123f9d6ad7SLin Ling ASSERT(dsl_pool_sync_context(dmu_objset_pool(os))); 10133f9d6ad7SLin Ling ASSERT(arc_released(os->os_phys_buf) || 10143f9d6ad7SLin Ling list_link_active(&os->os_dsl_dataset->ds_synced_link)); 10153f9d6ad7SLin Ling ASSERT(db->db_parent == NULL || arc_released(db->db_parent->db_buf)); 10163f9d6ad7SLin Ling 10171b912ec7SGeorge Wilson (void) arc_release(db->db_buf, db); 10183f9d6ad7SLin Ling } 10193f9d6ad7SLin Ling 1020c717a561Smaybee dbuf_dirty_record_t * 1021fa9e4066Sahrens dbuf_dirty(dmu_buf_impl_t *db, dmu_tx_t *tx) 1022fa9e4066Sahrens { 1023744947dcSTom Erickson dnode_t *dn; 1024744947dcSTom Erickson objset_t *os; 1025c717a561Smaybee dbuf_dirty_record_t **drp, *dr; 1026fa9e4066Sahrens int drop_struct_lock = FALSE; 1027d3469faaSMark Maybee boolean_t do_free_accounting = B_FALSE; 1028fa9e4066Sahrens int txgoff = tx->tx_txg & TXG_MASK; 1029fa9e4066Sahrens 1030fa9e4066Sahrens ASSERT(tx->tx_txg != 0); 1031fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 10329c9dc39aSek DMU_TX_DIRTY_BUF(tx, db); 1033fa9e4066Sahrens 1034744947dcSTom Erickson DB_DNODE_ENTER(db); 1035744947dcSTom Erickson dn = DB_DNODE(db); 1036fa9e4066Sahrens /* 1037fa9e4066Sahrens * Shouldn't dirty a regular buffer in syncing context. Private 1038fa9e4066Sahrens * objects may be dirtied in syncing context, but only if they 1039fa9e4066Sahrens * were already pre-dirtied in open context. 1040fa9e4066Sahrens */ 1041c717a561Smaybee ASSERT(!dmu_tx_is_syncing(tx) || 1042c717a561Smaybee BP_IS_HOLE(dn->dn_objset->os_rootbp) || 104314843421SMatthew Ahrens DMU_OBJECT_IS_SPECIAL(dn->dn_object) || 104414843421SMatthew Ahrens dn->dn_objset->os_dsl_dataset == NULL); 1045fa9e4066Sahrens /* 1046fa9e4066Sahrens * We make this assert for private objects as well, but after we 1047fa9e4066Sahrens * check if we're already dirty. They are allowed to re-dirty 1048fa9e4066Sahrens * in syncing context. 1049fa9e4066Sahrens */ 1050ea8dc4b6Seschrock ASSERT(dn->dn_object == DMU_META_DNODE_OBJECT || 1051c717a561Smaybee dn->dn_dirtyctx == DN_UNDIRTIED || dn->dn_dirtyctx == 1052fa9e4066Sahrens (dmu_tx_is_syncing(tx) ? DN_DIRTY_SYNC : DN_DIRTY_OPEN)); 1053fa9e4066Sahrens 1054fa9e4066Sahrens mutex_enter(&db->db_mtx); 1055fa9e4066Sahrens /* 1056c717a561Smaybee * XXX make this true for indirects too? The problem is that 1057c717a561Smaybee * transactions created with dmu_tx_create_assigned() from 1058c717a561Smaybee * syncing context don't bother holding ahead. 1059fa9e4066Sahrens */ 1060c717a561Smaybee ASSERT(db->db_level != 0 || 106182c9918fSTim Haley db->db_state == DB_CACHED || db->db_state == DB_FILL || 106282c9918fSTim Haley db->db_state == DB_NOFILL); 1063fa9e4066Sahrens 1064fa9e4066Sahrens mutex_enter(&dn->dn_mtx); 1065fa9e4066Sahrens /* 1066fa9e4066Sahrens * Don't set dirtyctx to SYNC if we're just modifying this as we 1067fa9e4066Sahrens * initialize the objset. 1068fa9e4066Sahrens */ 1069fa9e4066Sahrens if (dn->dn_dirtyctx == DN_UNDIRTIED && 1070c717a561Smaybee !BP_IS_HOLE(dn->dn_objset->os_rootbp)) { 1071fa9e4066Sahrens dn->dn_dirtyctx = 1072fa9e4066Sahrens (dmu_tx_is_syncing(tx) ? DN_DIRTY_SYNC : DN_DIRTY_OPEN); 1073fa9e4066Sahrens ASSERT(dn->dn_dirtyctx_firstset == NULL); 1074fa9e4066Sahrens dn->dn_dirtyctx_firstset = kmem_alloc(1, KM_SLEEP); 1075fa9e4066Sahrens } 1076fa9e4066Sahrens mutex_exit(&dn->dn_mtx); 1077fa9e4066Sahrens 10780a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) 10790a586ceaSMark Shellenbaum dn->dn_have_spill = B_TRUE; 10800a586ceaSMark Shellenbaum 1081fa9e4066Sahrens /* 1082fa9e4066Sahrens * If this buffer is already dirty, we're done. 1083fa9e4066Sahrens */ 1084c717a561Smaybee drp = &db->db_last_dirty; 1085c717a561Smaybee ASSERT(*drp == NULL || (*drp)->dr_txg <= tx->tx_txg || 1086c717a561Smaybee db->db.db_object == DMU_META_DNODE_OBJECT); 10877e2186e3Sbonwick while ((dr = *drp) != NULL && dr->dr_txg > tx->tx_txg) 10887e2186e3Sbonwick drp = &dr->dr_next; 10897e2186e3Sbonwick if (dr && dr->dr_txg == tx->tx_txg) { 1090744947dcSTom Erickson DB_DNODE_EXIT(db); 1091744947dcSTom Erickson 10920a586ceaSMark Shellenbaum if (db->db_level == 0 && db->db_blkid != DMU_BONUS_BLKID) { 1093c717a561Smaybee /* 1094c717a561Smaybee * If this buffer has already been written out, 1095c717a561Smaybee * we now need to reset its state. 1096c717a561Smaybee */ 10977e2186e3Sbonwick dbuf_unoverride(dr); 1098b24ab676SJeff Bonwick if (db->db.db_object != DMU_META_DNODE_OBJECT && 1099b24ab676SJeff Bonwick db->db_state != DB_NOFILL) 1100c717a561Smaybee arc_buf_thaw(db->db_buf); 1101c717a561Smaybee } 1102fa9e4066Sahrens mutex_exit(&db->db_mtx); 11037e2186e3Sbonwick return (dr); 1104fa9e4066Sahrens } 1105fa9e4066Sahrens 1106fa9e4066Sahrens /* 1107fa9e4066Sahrens * Only valid if not already dirty. 1108fa9e4066Sahrens */ 110914843421SMatthew Ahrens ASSERT(dn->dn_object == 0 || 111014843421SMatthew Ahrens dn->dn_dirtyctx == DN_UNDIRTIED || dn->dn_dirtyctx == 1111fa9e4066Sahrens (dmu_tx_is_syncing(tx) ? DN_DIRTY_SYNC : DN_DIRTY_OPEN)); 1112fa9e4066Sahrens 1113fa9e4066Sahrens ASSERT3U(dn->dn_nlevels, >, db->db_level); 1114fa9e4066Sahrens ASSERT((dn->dn_phys->dn_nlevels == 0 && db->db_level == 0) || 1115fa9e4066Sahrens dn->dn_phys->dn_nlevels > db->db_level || 1116fa9e4066Sahrens dn->dn_next_nlevels[txgoff] > db->db_level || 1117fa9e4066Sahrens dn->dn_next_nlevels[(tx->tx_txg-1) & TXG_MASK] > db->db_level || 1118fa9e4066Sahrens dn->dn_next_nlevels[(tx->tx_txg-2) & TXG_MASK] > db->db_level); 1119fa9e4066Sahrens 1120fa9e4066Sahrens /* 1121fa9e4066Sahrens * We should only be dirtying in syncing context if it's the 112214843421SMatthew Ahrens * mos or we're initializing the os or it's a special object. 112314843421SMatthew Ahrens * However, we are allowed to dirty in syncing context provided 112414843421SMatthew Ahrens * we already dirtied it in open context. Hence we must make 112514843421SMatthew Ahrens * this assertion only if we're not already dirty. 1126fa9e4066Sahrens */ 1127744947dcSTom Erickson os = dn->dn_objset; 112814843421SMatthew Ahrens ASSERT(!dmu_tx_is_syncing(tx) || DMU_OBJECT_IS_SPECIAL(dn->dn_object) || 112914843421SMatthew Ahrens os->os_dsl_dataset == NULL || BP_IS_HOLE(os->os_rootbp)); 1130fa9e4066Sahrens ASSERT(db->db.db_size != 0); 1131fa9e4066Sahrens 1132fa9e4066Sahrens dprintf_dbuf(db, "size=%llx\n", (u_longlong_t)db->db.db_size); 1133fa9e4066Sahrens 11340a586ceaSMark Shellenbaum if (db->db_blkid != DMU_BONUS_BLKID) { 11351934e92fSmaybee /* 11361934e92fSmaybee * Update the accounting. 1137d3469faaSMark Maybee * Note: we delay "free accounting" until after we drop 1138d3469faaSMark Maybee * the db_mtx. This keeps us from grabbing other locks 1139b24ab676SJeff Bonwick * (and possibly deadlocking) in bp_get_dsize() while 1140d3469faaSMark Maybee * also holding the db_mtx. 11411934e92fSmaybee */ 11421934e92fSmaybee dnode_willuse_space(dn, db->db.db_size, tx); 1143d3469faaSMark Maybee do_free_accounting = dbuf_block_freeable(db); 11441934e92fSmaybee } 11451934e92fSmaybee 1146ea8dc4b6Seschrock /* 1147ea8dc4b6Seschrock * If this buffer is dirty in an old transaction group we need 1148ea8dc4b6Seschrock * to make a copy of it so that the changes we make in this 1149ea8dc4b6Seschrock * transaction group won't leak out when we sync the older txg. 1150ea8dc4b6Seschrock */ 1151c717a561Smaybee dr = kmem_zalloc(sizeof (dbuf_dirty_record_t), KM_SLEEP); 1152c717a561Smaybee if (db->db_level == 0) { 1153c717a561Smaybee void *data_old = db->db_buf; 1154c717a561Smaybee 115582c9918fSTim Haley if (db->db_state != DB_NOFILL) { 11560a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 115782c9918fSTim Haley dbuf_fix_old_data(db, tx->tx_txg); 115882c9918fSTim Haley data_old = db->db.db_data; 115982c9918fSTim Haley } else if (db->db.db_object != DMU_META_DNODE_OBJECT) { 116082c9918fSTim Haley /* 116182c9918fSTim Haley * Release the data buffer from the cache so 116282c9918fSTim Haley * that we can modify it without impacting 116382c9918fSTim Haley * possible other users of this cached data 116482c9918fSTim Haley * block. Note that indirect blocks and 116582c9918fSTim Haley * private objects are not released until the 116682c9918fSTim Haley * syncing state (since they are only modified 116782c9918fSTim Haley * then). 116882c9918fSTim Haley */ 116982c9918fSTim Haley arc_release(db->db_buf, db); 117082c9918fSTim Haley dbuf_fix_old_data(db, tx->tx_txg); 117182c9918fSTim Haley data_old = db->db_buf; 117282c9918fSTim Haley } 117382c9918fSTim Haley ASSERT(data_old != NULL); 1174fa9e4066Sahrens } 1175c717a561Smaybee dr->dt.dl.dr_data = data_old; 1176c717a561Smaybee } else { 1177c717a561Smaybee mutex_init(&dr->dt.di.dr_mtx, NULL, MUTEX_DEFAULT, NULL); 1178c717a561Smaybee list_create(&dr->dt.di.dr_children, 1179c717a561Smaybee sizeof (dbuf_dirty_record_t), 1180c717a561Smaybee offsetof(dbuf_dirty_record_t, dr_dirty_node)); 1181fa9e4066Sahrens } 1182c717a561Smaybee dr->dr_dbuf = db; 1183c717a561Smaybee dr->dr_txg = tx->tx_txg; 1184c717a561Smaybee dr->dr_next = *drp; 1185c717a561Smaybee *drp = dr; 1186fa9e4066Sahrens 1187fa9e4066Sahrens /* 1188fa9e4066Sahrens * We could have been freed_in_flight between the dbuf_noread 1189fa9e4066Sahrens * and dbuf_dirty. We win, as though the dbuf_noread() had 1190fa9e4066Sahrens * happened after the free. 1191fa9e4066Sahrens */ 11920a586ceaSMark Shellenbaum if (db->db_level == 0 && db->db_blkid != DMU_BONUS_BLKID && 11930a586ceaSMark Shellenbaum db->db_blkid != DMU_SPILL_BLKID) { 1194c717a561Smaybee mutex_enter(&dn->dn_mtx); 1195fa9e4066Sahrens dnode_clear_range(dn, db->db_blkid, 1, tx); 1196c717a561Smaybee mutex_exit(&dn->dn_mtx); 1197c717a561Smaybee db->db_freed_in_flight = FALSE; 1198fa9e4066Sahrens } 1199fa9e4066Sahrens 1200fa9e4066Sahrens /* 1201fa9e4066Sahrens * This buffer is now part of this txg 1202fa9e4066Sahrens */ 1203fa9e4066Sahrens dbuf_add_ref(db, (void *)(uintptr_t)tx->tx_txg); 1204fa9e4066Sahrens db->db_dirtycnt += 1; 1205fa9e4066Sahrens ASSERT3U(db->db_dirtycnt, <=, 3); 1206fa9e4066Sahrens 1207fa9e4066Sahrens mutex_exit(&db->db_mtx); 1208fa9e4066Sahrens 12090a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID || 12100a586ceaSMark Shellenbaum db->db_blkid == DMU_SPILL_BLKID) { 1211c717a561Smaybee mutex_enter(&dn->dn_mtx); 1212c717a561Smaybee ASSERT(!list_link_active(&dr->dr_dirty_node)); 1213c717a561Smaybee list_insert_tail(&dn->dn_dirty_records[txgoff], dr); 1214c717a561Smaybee mutex_exit(&dn->dn_mtx); 1215fa9e4066Sahrens dnode_setdirty(dn, tx); 1216744947dcSTom Erickson DB_DNODE_EXIT(db); 1217c717a561Smaybee return (dr); 1218d3469faaSMark Maybee } else if (do_free_accounting) { 1219d3469faaSMark Maybee blkptr_t *bp = db->db_blkptr; 1220d3469faaSMark Maybee int64_t willfree = (bp && !BP_IS_HOLE(bp)) ? 1221b24ab676SJeff Bonwick bp_get_dsize(os->os_spa, bp) : db->db.db_size; 1222d3469faaSMark Maybee /* 1223d3469faaSMark Maybee * This is only a guess -- if the dbuf is dirty 1224d3469faaSMark Maybee * in a previous txg, we don't know how much 1225d3469faaSMark Maybee * space it will use on disk yet. We should 1226d3469faaSMark Maybee * really have the struct_rwlock to access 1227d3469faaSMark Maybee * db_blkptr, but since this is just a guess, 1228d3469faaSMark Maybee * it's OK if we get an odd answer. 1229d3469faaSMark Maybee */ 1230837b568bSGeorge Wilson ddt_prefetch(os->os_spa, bp); 1231d3469faaSMark Maybee dnode_willuse_space(dn, -willfree, tx); 1232fa9e4066Sahrens } 1233fa9e4066Sahrens 1234fa9e4066Sahrens if (!RW_WRITE_HELD(&dn->dn_struct_rwlock)) { 1235fa9e4066Sahrens rw_enter(&dn->dn_struct_rwlock, RW_READER); 1236fa9e4066Sahrens drop_struct_lock = TRUE; 1237fa9e4066Sahrens } 1238fa9e4066Sahrens 12398346f03fSJonathan W Adams if (db->db_level == 0) { 12408346f03fSJonathan W Adams dnode_new_blkid(dn, db->db_blkid, tx, drop_struct_lock); 12418346f03fSJonathan W Adams ASSERT(dn->dn_maxblkid >= db->db_blkid); 12428346f03fSJonathan W Adams } 12438346f03fSJonathan W Adams 124444eda4d7Smaybee if (db->db_level+1 < dn->dn_nlevels) { 1245c717a561Smaybee dmu_buf_impl_t *parent = db->db_parent; 1246c717a561Smaybee dbuf_dirty_record_t *di; 1247c717a561Smaybee int parent_held = FALSE; 1248c717a561Smaybee 1249c717a561Smaybee if (db->db_parent == NULL || db->db_parent == dn->dn_dbuf) { 1250c717a561Smaybee int epbs = dn->dn_indblkshift - SPA_BLKPTRSHIFT; 1251c717a561Smaybee 1252c717a561Smaybee parent = dbuf_hold_level(dn, db->db_level+1, 1253c717a561Smaybee db->db_blkid >> epbs, FTAG); 125401025c89SJohn Harres ASSERT(parent != NULL); 1255c717a561Smaybee parent_held = TRUE; 1256c717a561Smaybee } 1257fa9e4066Sahrens if (drop_struct_lock) 1258fa9e4066Sahrens rw_exit(&dn->dn_struct_rwlock); 1259c717a561Smaybee ASSERT3U(db->db_level+1, ==, parent->db_level); 1260c717a561Smaybee di = dbuf_dirty(parent, tx); 1261c717a561Smaybee if (parent_held) 1262c717a561Smaybee dbuf_rele(parent, FTAG); 1263c717a561Smaybee 1264c717a561Smaybee mutex_enter(&db->db_mtx); 1265c717a561Smaybee /* possible race with dbuf_undirty() */ 1266c717a561Smaybee if (db->db_last_dirty == dr || 1267c717a561Smaybee dn->dn_object == DMU_META_DNODE_OBJECT) { 1268c717a561Smaybee mutex_enter(&di->dt.di.dr_mtx); 1269c717a561Smaybee ASSERT3U(di->dr_txg, ==, tx->tx_txg); 1270c717a561Smaybee ASSERT(!list_link_active(&dr->dr_dirty_node)); 1271c717a561Smaybee list_insert_tail(&di->dt.di.dr_children, dr); 1272c717a561Smaybee mutex_exit(&di->dt.di.dr_mtx); 1273c717a561Smaybee dr->dr_parent = di; 1274c717a561Smaybee } 1275c717a561Smaybee mutex_exit(&db->db_mtx); 1276fa9e4066Sahrens } else { 1277c717a561Smaybee ASSERT(db->db_level+1 == dn->dn_nlevels); 1278c717a561Smaybee ASSERT(db->db_blkid < dn->dn_nblkptr); 1279744947dcSTom Erickson ASSERT(db->db_parent == NULL || db->db_parent == dn->dn_dbuf); 1280c717a561Smaybee mutex_enter(&dn->dn_mtx); 1281c717a561Smaybee ASSERT(!list_link_active(&dr->dr_dirty_node)); 1282c717a561Smaybee list_insert_tail(&dn->dn_dirty_records[txgoff], dr); 1283c717a561Smaybee mutex_exit(&dn->dn_mtx); 1284fa9e4066Sahrens if (drop_struct_lock) 1285fa9e4066Sahrens rw_exit(&dn->dn_struct_rwlock); 1286fa9e4066Sahrens } 1287fa9e4066Sahrens 1288fa9e4066Sahrens dnode_setdirty(dn, tx); 1289744947dcSTom Erickson DB_DNODE_EXIT(db); 1290c717a561Smaybee return (dr); 1291fa9e4066Sahrens } 1292fa9e4066Sahrens 12933b2aab18SMatthew Ahrens /* 12943e30c24aSWill Andrews * Undirty a buffer in the transaction group referenced by the given 12953e30c24aSWill Andrews * transaction. Return whether this evicted the dbuf. 12963b2aab18SMatthew Ahrens */ 12973b2aab18SMatthew Ahrens static boolean_t 1298fa9e4066Sahrens dbuf_undirty(dmu_buf_impl_t *db, dmu_tx_t *tx) 1299fa9e4066Sahrens { 1300744947dcSTom Erickson dnode_t *dn; 1301c717a561Smaybee uint64_t txg = tx->tx_txg; 130217f17c2dSbonwick dbuf_dirty_record_t *dr, **drp; 1303fa9e4066Sahrens 1304c717a561Smaybee ASSERT(txg != 0); 13050a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 13063b2aab18SMatthew Ahrens ASSERT0(db->db_level); 13073b2aab18SMatthew Ahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 1308fa9e4066Sahrens 1309fa9e4066Sahrens /* 1310fa9e4066Sahrens * If this buffer is not dirty, we're done. 1311fa9e4066Sahrens */ 131217f17c2dSbonwick for (drp = &db->db_last_dirty; (dr = *drp) != NULL; drp = &dr->dr_next) 1313c717a561Smaybee if (dr->dr_txg <= txg) 1314c717a561Smaybee break; 13153b2aab18SMatthew Ahrens if (dr == NULL || dr->dr_txg < txg) 13163b2aab18SMatthew Ahrens return (B_FALSE); 1317c717a561Smaybee ASSERT(dr->dr_txg == txg); 1318b24ab676SJeff Bonwick ASSERT(dr->dr_dbuf == db); 1319fa9e4066Sahrens 1320744947dcSTom Erickson DB_DNODE_ENTER(db); 1321744947dcSTom Erickson dn = DB_DNODE(db); 1322744947dcSTom Erickson 1323fa9e4066Sahrens /* 13243b2aab18SMatthew Ahrens * Note: This code will probably work even if there are concurrent 13253b2aab18SMatthew Ahrens * holders, but it is untested in that scenerio, as the ZPL and 13263b2aab18SMatthew Ahrens * ztest have additional locking (the range locks) that prevents 13273b2aab18SMatthew Ahrens * that type of concurrent access. 1328fa9e4066Sahrens */ 13293b2aab18SMatthew Ahrens ASSERT3U(refcount_count(&db->db_holds), ==, db->db_dirtycnt); 1330fa9e4066Sahrens 1331fa9e4066Sahrens dprintf_dbuf(db, "size=%llx\n", (u_longlong_t)db->db.db_size); 1332fa9e4066Sahrens 1333fa9e4066Sahrens ASSERT(db->db.db_size != 0); 1334fa9e4066Sahrens 1335fa9e4066Sahrens /* XXX would be nice to fix up dn_towrite_space[] */ 1336fa9e4066Sahrens 133717f17c2dSbonwick *drp = dr->dr_next; 1338c717a561Smaybee 13393f2366c2SGordon Ross /* 13403f2366c2SGordon Ross * Note that there are three places in dbuf_dirty() 13413f2366c2SGordon Ross * where this dirty record may be put on a list. 13423f2366c2SGordon Ross * Make sure to do a list_remove corresponding to 13433f2366c2SGordon Ross * every one of those list_insert calls. 13443f2366c2SGordon Ross */ 1345c717a561Smaybee if (dr->dr_parent) { 1346c717a561Smaybee mutex_enter(&dr->dr_parent->dt.di.dr_mtx); 1347c717a561Smaybee list_remove(&dr->dr_parent->dt.di.dr_children, dr); 1348c717a561Smaybee mutex_exit(&dr->dr_parent->dt.di.dr_mtx); 13493f2366c2SGordon Ross } else if (db->db_blkid == DMU_SPILL_BLKID || 13503f2366c2SGordon Ross db->db_level+1 == dn->dn_nlevels) { 1351cdb0ab79Smaybee ASSERT(db->db_blkptr == NULL || db->db_parent == dn->dn_dbuf); 1352c717a561Smaybee mutex_enter(&dn->dn_mtx); 1353c717a561Smaybee list_remove(&dn->dn_dirty_records[txg & TXG_MASK], dr); 1354c717a561Smaybee mutex_exit(&dn->dn_mtx); 1355c717a561Smaybee } 1356744947dcSTom Erickson DB_DNODE_EXIT(db); 1357c717a561Smaybee 13583b2aab18SMatthew Ahrens if (db->db_state != DB_NOFILL) { 13593b2aab18SMatthew Ahrens dbuf_unoverride(dr); 1360c717a561Smaybee 1361c717a561Smaybee ASSERT(db->db_buf != NULL); 13623b2aab18SMatthew Ahrens ASSERT(dr->dt.dl.dr_data != NULL); 13633b2aab18SMatthew Ahrens if (dr->dt.dl.dr_data != db->db_buf) 13643b2aab18SMatthew Ahrens VERIFY(arc_buf_remove_ref(dr->dt.dl.dr_data, db)); 1365c717a561Smaybee } 1366c717a561Smaybee kmem_free(dr, sizeof (dbuf_dirty_record_t)); 1367fa9e4066Sahrens 1368fa9e4066Sahrens ASSERT(db->db_dirtycnt > 0); 1369fa9e4066Sahrens db->db_dirtycnt -= 1; 1370fa9e4066Sahrens 1371c717a561Smaybee if (refcount_remove(&db->db_holds, (void *)(uintptr_t)txg) == 0) { 1372ea8dc4b6Seschrock arc_buf_t *buf = db->db_buf; 1373fa9e4066Sahrens 1374b24ab676SJeff Bonwick ASSERT(db->db_state == DB_NOFILL || arc_released(buf)); 1375ea8dc4b6Seschrock dbuf_set_data(db, NULL); 13763b2aab18SMatthew Ahrens VERIFY(arc_buf_remove_ref(buf, db)); 1377fa9e4066Sahrens dbuf_evict(db); 13783b2aab18SMatthew Ahrens return (B_TRUE); 1379fa9e4066Sahrens } 1380fa9e4066Sahrens 13813b2aab18SMatthew Ahrens return (B_FALSE); 1382fa9e4066Sahrens } 1383fa9e4066Sahrens 1384fa9e4066Sahrens #pragma weak dmu_buf_will_dirty = dbuf_will_dirty 1385fa9e4066Sahrens void 1386fa9e4066Sahrens dbuf_will_dirty(dmu_buf_impl_t *db, dmu_tx_t *tx) 1387fa9e4066Sahrens { 13881ab7f2deSmaybee int rf = DB_RF_MUST_SUCCEED | DB_RF_NOPREFETCH; 1389fa9e4066Sahrens 1390fa9e4066Sahrens ASSERT(tx->tx_txg != 0); 1391fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 1392fa9e4066Sahrens 1393744947dcSTom Erickson DB_DNODE_ENTER(db); 1394744947dcSTom Erickson if (RW_WRITE_HELD(&DB_DNODE(db)->dn_struct_rwlock)) 1395fa9e4066Sahrens rf |= DB_RF_HAVESTRUCT; 1396744947dcSTom Erickson DB_DNODE_EXIT(db); 1397ea8dc4b6Seschrock (void) dbuf_read(db, NULL, rf); 1398c717a561Smaybee (void) dbuf_dirty(db, tx); 1399fa9e4066Sahrens } 1400fa9e4066Sahrens 140182c9918fSTim Haley void 140282c9918fSTim Haley dmu_buf_will_not_fill(dmu_buf_t *db_fake, dmu_tx_t *tx) 140382c9918fSTim Haley { 140482c9918fSTim Haley dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 140582c9918fSTim Haley 140682c9918fSTim Haley db->db_state = DB_NOFILL; 140782c9918fSTim Haley 140882c9918fSTim Haley dmu_buf_will_fill(db_fake, tx); 140982c9918fSTim Haley } 141082c9918fSTim Haley 1411fa9e4066Sahrens void 1412ea8dc4b6Seschrock dmu_buf_will_fill(dmu_buf_t *db_fake, dmu_tx_t *tx) 1413fa9e4066Sahrens { 1414ea8dc4b6Seschrock dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 1415ea8dc4b6Seschrock 14160a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 1417fa9e4066Sahrens ASSERT(tx->tx_txg != 0); 1418fa9e4066Sahrens ASSERT(db->db_level == 0); 1419fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 1420fa9e4066Sahrens 1421ea8dc4b6Seschrock ASSERT(db->db.db_object != DMU_META_DNODE_OBJECT || 1422fa9e4066Sahrens dmu_tx_private_ok(tx)); 1423fa9e4066Sahrens 1424fa9e4066Sahrens dbuf_noread(db); 1425c717a561Smaybee (void) dbuf_dirty(db, tx); 1426fa9e4066Sahrens } 1427fa9e4066Sahrens 1428fa9e4066Sahrens #pragma weak dmu_buf_fill_done = dbuf_fill_done 1429fa9e4066Sahrens /* ARGSUSED */ 1430fa9e4066Sahrens void 1431fa9e4066Sahrens dbuf_fill_done(dmu_buf_impl_t *db, dmu_tx_t *tx) 1432fa9e4066Sahrens { 1433fa9e4066Sahrens mutex_enter(&db->db_mtx); 14349c9dc39aSek DBUF_VERIFY(db); 1435fa9e4066Sahrens 1436fa9e4066Sahrens if (db->db_state == DB_FILL) { 1437c717a561Smaybee if (db->db_level == 0 && db->db_freed_in_flight) { 14380a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 1439fa9e4066Sahrens /* we were freed while filling */ 1440fa9e4066Sahrens /* XXX dbuf_undirty? */ 1441fa9e4066Sahrens bzero(db->db.db_data, db->db.db_size); 1442c717a561Smaybee db->db_freed_in_flight = FALSE; 1443fa9e4066Sahrens } 1444fa9e4066Sahrens db->db_state = DB_CACHED; 1445fa9e4066Sahrens cv_broadcast(&db->db_changed); 1446fa9e4066Sahrens } 1447fa9e4066Sahrens mutex_exit(&db->db_mtx); 1448fa9e4066Sahrens } 1449fa9e4066Sahrens 14502fdbea25SAleksandr Guzovskiy /* 14512fdbea25SAleksandr Guzovskiy * Directly assign a provided arc buf to a given dbuf if it's not referenced 14522fdbea25SAleksandr Guzovskiy * by anybody except our caller. Otherwise copy arcbuf's contents to dbuf. 14532fdbea25SAleksandr Guzovskiy */ 14542fdbea25SAleksandr Guzovskiy void 14552fdbea25SAleksandr Guzovskiy dbuf_assign_arcbuf(dmu_buf_impl_t *db, arc_buf_t *buf, dmu_tx_t *tx) 14562fdbea25SAleksandr Guzovskiy { 14572fdbea25SAleksandr Guzovskiy ASSERT(!refcount_is_zero(&db->db_holds)); 14580a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 14592fdbea25SAleksandr Guzovskiy ASSERT(db->db_level == 0); 14602fdbea25SAleksandr Guzovskiy ASSERT(DBUF_GET_BUFC_TYPE(db) == ARC_BUFC_DATA); 14612fdbea25SAleksandr Guzovskiy ASSERT(buf != NULL); 14622fdbea25SAleksandr Guzovskiy ASSERT(arc_buf_size(buf) == db->db.db_size); 14632fdbea25SAleksandr Guzovskiy ASSERT(tx->tx_txg != 0); 14642fdbea25SAleksandr Guzovskiy 14652fdbea25SAleksandr Guzovskiy arc_return_buf(buf, db); 14662fdbea25SAleksandr Guzovskiy ASSERT(arc_released(buf)); 14672fdbea25SAleksandr Guzovskiy 14682fdbea25SAleksandr Guzovskiy mutex_enter(&db->db_mtx); 14692fdbea25SAleksandr Guzovskiy 14702fdbea25SAleksandr Guzovskiy while (db->db_state == DB_READ || db->db_state == DB_FILL) 14712fdbea25SAleksandr Guzovskiy cv_wait(&db->db_changed, &db->db_mtx); 14722fdbea25SAleksandr Guzovskiy 14732fdbea25SAleksandr Guzovskiy ASSERT(db->db_state == DB_CACHED || db->db_state == DB_UNCACHED); 14742fdbea25SAleksandr Guzovskiy 14752fdbea25SAleksandr Guzovskiy if (db->db_state == DB_CACHED && 14762fdbea25SAleksandr Guzovskiy refcount_count(&db->db_holds) - 1 > db->db_dirtycnt) { 14772fdbea25SAleksandr Guzovskiy mutex_exit(&db->db_mtx); 14782fdbea25SAleksandr Guzovskiy (void) dbuf_dirty(db, tx); 14792fdbea25SAleksandr Guzovskiy bcopy(buf->b_data, db->db.db_data, db->db.db_size); 14803b2aab18SMatthew Ahrens VERIFY(arc_buf_remove_ref(buf, db)); 1481c242f9a0Schunli zhang - Sun Microsystems - Irvine United States xuio_stat_wbuf_copied(); 14822fdbea25SAleksandr Guzovskiy return; 14832fdbea25SAleksandr Guzovskiy } 14842fdbea25SAleksandr Guzovskiy 1485c242f9a0Schunli zhang - Sun Microsystems - Irvine United States xuio_stat_wbuf_nocopy(); 14862fdbea25SAleksandr Guzovskiy if (db->db_state == DB_CACHED) { 14872fdbea25SAleksandr Guzovskiy dbuf_dirty_record_t *dr = db->db_last_dirty; 14882fdbea25SAleksandr Guzovskiy 14892fdbea25SAleksandr Guzovskiy ASSERT(db->db_buf != NULL); 14902fdbea25SAleksandr Guzovskiy if (dr != NULL && dr->dr_txg == tx->tx_txg) { 14912fdbea25SAleksandr Guzovskiy ASSERT(dr->dt.dl.dr_data == db->db_buf); 14922fdbea25SAleksandr Guzovskiy if (!arc_released(db->db_buf)) { 14932fdbea25SAleksandr Guzovskiy ASSERT(dr->dt.dl.dr_override_state == 14942fdbea25SAleksandr Guzovskiy DR_OVERRIDDEN); 14952fdbea25SAleksandr Guzovskiy arc_release(db->db_buf, db); 14962fdbea25SAleksandr Guzovskiy } 14972fdbea25SAleksandr Guzovskiy dr->dt.dl.dr_data = buf; 14983b2aab18SMatthew Ahrens VERIFY(arc_buf_remove_ref(db->db_buf, db)); 14992fdbea25SAleksandr Guzovskiy } else if (dr == NULL || dr->dt.dl.dr_data != db->db_buf) { 15002fdbea25SAleksandr Guzovskiy arc_release(db->db_buf, db); 15013b2aab18SMatthew Ahrens VERIFY(arc_buf_remove_ref(db->db_buf, db)); 15022fdbea25SAleksandr Guzovskiy } 15032fdbea25SAleksandr Guzovskiy db->db_buf = NULL; 15042fdbea25SAleksandr Guzovskiy } 15052fdbea25SAleksandr Guzovskiy ASSERT(db->db_buf == NULL); 15062fdbea25SAleksandr Guzovskiy dbuf_set_data(db, buf); 15072fdbea25SAleksandr Guzovskiy db->db_state = DB_FILL; 15082fdbea25SAleksandr Guzovskiy mutex_exit(&db->db_mtx); 15092fdbea25SAleksandr Guzovskiy (void) dbuf_dirty(db, tx); 15102fdbea25SAleksandr Guzovskiy dbuf_fill_done(db, tx); 15112fdbea25SAleksandr Guzovskiy } 15122fdbea25SAleksandr Guzovskiy 1513ea8dc4b6Seschrock /* 1514ea8dc4b6Seschrock * "Clear" the contents of this dbuf. This will mark the dbuf 1515ea8dc4b6Seschrock * EVICTING and clear *most* of its references. Unfortunetely, 1516ea8dc4b6Seschrock * when we are not holding the dn_dbufs_mtx, we can't clear the 1517ea8dc4b6Seschrock * entry in the dn_dbufs list. We have to wait until dbuf_destroy() 1518ea8dc4b6Seschrock * in this case. For callers from the DMU we will usually see: 1519ea8dc4b6Seschrock * dbuf_clear()->arc_buf_evict()->dbuf_do_evict()->dbuf_destroy() 1520ea8dc4b6Seschrock * For the arc callback, we will usually see: 1521744947dcSTom Erickson * dbuf_do_evict()->dbuf_clear();dbuf_destroy() 1522ea8dc4b6Seschrock * Sometimes, though, we will get a mix of these two: 1523ea8dc4b6Seschrock * DMU: dbuf_clear()->arc_buf_evict() 1524ea8dc4b6Seschrock * ARC: dbuf_do_evict()->dbuf_destroy() 1525ea8dc4b6Seschrock */ 1526ea8dc4b6Seschrock void 1527fa9e4066Sahrens dbuf_clear(dmu_buf_impl_t *db) 1528fa9e4066Sahrens { 1529744947dcSTom Erickson dnode_t *dn; 1530ea8dc4b6Seschrock dmu_buf_impl_t *parent = db->db_parent; 1531744947dcSTom Erickson dmu_buf_impl_t *dndb; 1532ea8dc4b6Seschrock int dbuf_gone = FALSE; 1533fa9e4066Sahrens 1534fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 1535fa9e4066Sahrens ASSERT(refcount_is_zero(&db->db_holds)); 1536fa9e4066Sahrens 1537ea8dc4b6Seschrock dbuf_evict_user(db); 1538ea8dc4b6Seschrock 1539fa9e4066Sahrens if (db->db_state == DB_CACHED) { 1540ea8dc4b6Seschrock ASSERT(db->db.db_data != NULL); 15410a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 1542ea8dc4b6Seschrock zio_buf_free(db->db.db_data, DN_MAX_BONUSLEN); 15435a98e54bSBrendan Gregg - Sun Microsystems arc_space_return(DN_MAX_BONUSLEN, ARC_SPACE_OTHER); 15440e8c6158Smaybee } 1545fa9e4066Sahrens db->db.db_data = NULL; 1546fa9e4066Sahrens db->db_state = DB_UNCACHED; 1547fa9e4066Sahrens } 1548fa9e4066Sahrens 154982c9918fSTim Haley ASSERT(db->db_state == DB_UNCACHED || db->db_state == DB_NOFILL); 1550fa9e4066Sahrens ASSERT(db->db_data_pending == NULL); 1551fa9e4066Sahrens 1552ea8dc4b6Seschrock db->db_state = DB_EVICTING; 1553ea8dc4b6Seschrock db->db_blkptr = NULL; 1554ea8dc4b6Seschrock 1555744947dcSTom Erickson DB_DNODE_ENTER(db); 1556744947dcSTom Erickson dn = DB_DNODE(db); 1557744947dcSTom Erickson dndb = dn->dn_dbuf; 15580a586ceaSMark Shellenbaum if (db->db_blkid != DMU_BONUS_BLKID && MUTEX_HELD(&dn->dn_dbufs_mtx)) { 1559ea8dc4b6Seschrock list_remove(&dn->dn_dbufs, db); 1560744947dcSTom Erickson (void) atomic_dec_32_nv(&dn->dn_dbufs_count); 1561744947dcSTom Erickson membar_producer(); 1562744947dcSTom Erickson DB_DNODE_EXIT(db); 1563744947dcSTom Erickson /* 1564744947dcSTom Erickson * Decrementing the dbuf count means that the hold corresponding 1565744947dcSTom Erickson * to the removed dbuf is no longer discounted in dnode_move(), 1566744947dcSTom Erickson * so the dnode cannot be moved until after we release the hold. 1567744947dcSTom Erickson * The membar_producer() ensures visibility of the decremented 1568744947dcSTom Erickson * value in dnode_move(), since DB_DNODE_EXIT doesn't actually 1569744947dcSTom Erickson * release any lock. 1570744947dcSTom Erickson */ 1571ea8dc4b6Seschrock dnode_rele(dn, db); 1572744947dcSTom Erickson db->db_dnode_handle = NULL; 1573744947dcSTom Erickson } else { 1574744947dcSTom Erickson DB_DNODE_EXIT(db); 1575ea8dc4b6Seschrock } 1576ea8dc4b6Seschrock 1577ea8dc4b6Seschrock if (db->db_buf) 1578ea8dc4b6Seschrock dbuf_gone = arc_buf_evict(db->db_buf); 1579ea8dc4b6Seschrock 1580ea8dc4b6Seschrock if (!dbuf_gone) 1581ea8dc4b6Seschrock mutex_exit(&db->db_mtx); 1582fa9e4066Sahrens 1583fa9e4066Sahrens /* 1584744947dcSTom Erickson * If this dbuf is referenced from an indirect dbuf, 1585fa9e4066Sahrens * decrement the ref count on the indirect dbuf. 1586fa9e4066Sahrens */ 1587c543ec06Sahrens if (parent && parent != dndb) 1588ea8dc4b6Seschrock dbuf_rele(parent, db); 1589fa9e4066Sahrens } 1590fa9e4066Sahrens 1591fa9e4066Sahrens static int 1592fa9e4066Sahrens dbuf_findbp(dnode_t *dn, int level, uint64_t blkid, int fail_sparse, 1593fa9e4066Sahrens dmu_buf_impl_t **parentp, blkptr_t **bpp) 1594fa9e4066Sahrens { 1595fa9e4066Sahrens int nlevels, epbs; 1596fa9e4066Sahrens 15970b69c2f0Sahrens *parentp = NULL; 15980b69c2f0Sahrens *bpp = NULL; 15990b69c2f0Sahrens 16000a586ceaSMark Shellenbaum ASSERT(blkid != DMU_BONUS_BLKID); 16010a586ceaSMark Shellenbaum 16020a586ceaSMark Shellenbaum if (blkid == DMU_SPILL_BLKID) { 16030a586ceaSMark Shellenbaum mutex_enter(&dn->dn_mtx); 160406e0070dSMark Shellenbaum if (dn->dn_have_spill && 160506e0070dSMark Shellenbaum (dn->dn_phys->dn_flags & DNODE_FLAG_SPILL_BLKPTR)) 16060a586ceaSMark Shellenbaum *bpp = &dn->dn_phys->dn_spill; 16070a586ceaSMark Shellenbaum else 16080a586ceaSMark Shellenbaum *bpp = NULL; 16090a586ceaSMark Shellenbaum dbuf_add_ref(dn->dn_dbuf, NULL); 16100a586ceaSMark Shellenbaum *parentp = dn->dn_dbuf; 16110a586ceaSMark Shellenbaum mutex_exit(&dn->dn_mtx); 16120a586ceaSMark Shellenbaum return (0); 16130a586ceaSMark Shellenbaum } 1614ea8dc4b6Seschrock 1615fa9e4066Sahrens if (dn->dn_phys->dn_nlevels == 0) 1616fa9e4066Sahrens nlevels = 1; 1617fa9e4066Sahrens else 1618fa9e4066Sahrens nlevels = dn->dn_phys->dn_nlevels; 1619fa9e4066Sahrens 1620fa9e4066Sahrens epbs = dn->dn_indblkshift - SPA_BLKPTRSHIFT; 1621fa9e4066Sahrens 1622fa9e4066Sahrens ASSERT3U(level * epbs, <, 64); 1623fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 1624ea8dc4b6Seschrock if (level >= nlevels || 1625fa9e4066Sahrens (blkid > (dn->dn_phys->dn_maxblkid >> (level * epbs)))) { 1626fa9e4066Sahrens /* the buffer has no parent yet */ 1627be6fd75aSMatthew Ahrens return (SET_ERROR(ENOENT)); 1628fa9e4066Sahrens } else if (level < nlevels-1) { 1629fa9e4066Sahrens /* this block is referenced from an indirect block */ 1630fa9e4066Sahrens int err = dbuf_hold_impl(dn, level+1, 1631fa9e4066Sahrens blkid >> epbs, fail_sparse, NULL, parentp); 1632fa9e4066Sahrens if (err) 1633fa9e4066Sahrens return (err); 1634ea8dc4b6Seschrock err = dbuf_read(*parentp, NULL, 1635ea8dc4b6Seschrock (DB_RF_HAVESTRUCT | DB_RF_NOPREFETCH | DB_RF_CANFAIL)); 1636c543ec06Sahrens if (err) { 1637c543ec06Sahrens dbuf_rele(*parentp, NULL); 1638c543ec06Sahrens *parentp = NULL; 1639c543ec06Sahrens return (err); 1640ea8dc4b6Seschrock } 1641c543ec06Sahrens *bpp = ((blkptr_t *)(*parentp)->db.db_data) + 1642c543ec06Sahrens (blkid & ((1ULL << epbs) - 1)); 1643c543ec06Sahrens return (0); 1644fa9e4066Sahrens } else { 1645fa9e4066Sahrens /* the block is referenced from the dnode */ 1646fa9e4066Sahrens ASSERT3U(level, ==, nlevels-1); 1647fa9e4066Sahrens ASSERT(dn->dn_phys->dn_nblkptr == 0 || 1648fa9e4066Sahrens blkid < dn->dn_phys->dn_nblkptr); 1649c543ec06Sahrens if (dn->dn_dbuf) { 1650c543ec06Sahrens dbuf_add_ref(dn->dn_dbuf, NULL); 1651c543ec06Sahrens *parentp = dn->dn_dbuf; 1652c543ec06Sahrens } 1653fa9e4066Sahrens *bpp = &dn->dn_phys->dn_blkptr[blkid]; 1654fa9e4066Sahrens return (0); 1655fa9e4066Sahrens } 1656fa9e4066Sahrens } 1657fa9e4066Sahrens 1658fa9e4066Sahrens static dmu_buf_impl_t * 1659fa9e4066Sahrens dbuf_create(dnode_t *dn, uint8_t level, uint64_t blkid, 1660fa9e4066Sahrens dmu_buf_impl_t *parent, blkptr_t *blkptr) 1661fa9e4066Sahrens { 1662503ad85cSMatthew Ahrens objset_t *os = dn->dn_objset; 1663fa9e4066Sahrens dmu_buf_impl_t *db, *odb; 1664fa9e4066Sahrens 1665fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 1666fa9e4066Sahrens ASSERT(dn->dn_type != DMU_OT_NONE); 1667fa9e4066Sahrens 1668fa9e4066Sahrens db = kmem_cache_alloc(dbuf_cache, KM_SLEEP); 1669fa9e4066Sahrens 1670fa9e4066Sahrens db->db_objset = os; 1671fa9e4066Sahrens db->db.db_object = dn->dn_object; 1672fa9e4066Sahrens db->db_level = level; 1673fa9e4066Sahrens db->db_blkid = blkid; 1674c717a561Smaybee db->db_last_dirty = NULL; 1675ea8dc4b6Seschrock db->db_dirtycnt = 0; 1676744947dcSTom Erickson db->db_dnode_handle = dn->dn_handle; 1677ea8dc4b6Seschrock db->db_parent = parent; 1678ea8dc4b6Seschrock db->db_blkptr = blkptr; 1679fa9e4066Sahrens 1680c717a561Smaybee db->db_user_ptr = NULL; 1681c717a561Smaybee db->db_user_data_ptr_ptr = NULL; 1682c717a561Smaybee db->db_evict_func = NULL; 1683c717a561Smaybee db->db_immediate_evict = 0; 1684c717a561Smaybee db->db_freed_in_flight = 0; 1685ea8dc4b6Seschrock 16860a586ceaSMark Shellenbaum if (blkid == DMU_BONUS_BLKID) { 1687ea8dc4b6Seschrock ASSERT3P(parent, ==, dn->dn_dbuf); 16881934e92fSmaybee db->db.db_size = DN_MAX_BONUSLEN - 16891934e92fSmaybee (dn->dn_nblkptr-1) * sizeof (blkptr_t); 16901934e92fSmaybee ASSERT3U(db->db.db_size, >=, dn->dn_bonuslen); 16910a586ceaSMark Shellenbaum db->db.db_offset = DMU_BONUS_BLKID; 1692ea8dc4b6Seschrock db->db_state = DB_UNCACHED; 1693ea8dc4b6Seschrock /* the bonus dbuf is not placed in the hash table */ 16945a98e54bSBrendan Gregg - Sun Microsystems arc_space_consume(sizeof (dmu_buf_impl_t), ARC_SPACE_OTHER); 1695ea8dc4b6Seschrock return (db); 16960a586ceaSMark Shellenbaum } else if (blkid == DMU_SPILL_BLKID) { 16970a586ceaSMark Shellenbaum db->db.db_size = (blkptr != NULL) ? 16980a586ceaSMark Shellenbaum BP_GET_LSIZE(blkptr) : SPA_MINBLOCKSIZE; 16990a586ceaSMark Shellenbaum db->db.db_offset = 0; 1700fa9e4066Sahrens } else { 1701fa9e4066Sahrens int blocksize = 1702fa9e4066Sahrens db->db_level ? 1<<dn->dn_indblkshift : dn->dn_datablksz; 1703fa9e4066Sahrens db->db.db_size = blocksize; 1704fa9e4066Sahrens db->db.db_offset = db->db_blkid * blocksize; 1705fa9e4066Sahrens } 1706fa9e4066Sahrens 1707fa9e4066Sahrens /* 1708fa9e4066Sahrens * Hold the dn_dbufs_mtx while we get the new dbuf 1709fa9e4066Sahrens * in the hash table *and* added to the dbufs list. 1710fa9e4066Sahrens * This prevents a possible deadlock with someone 1711fa9e4066Sahrens * trying to look up this dbuf before its added to the 1712fa9e4066Sahrens * dn_dbufs list. 1713fa9e4066Sahrens */ 1714fa9e4066Sahrens mutex_enter(&dn->dn_dbufs_mtx); 1715ea8dc4b6Seschrock db->db_state = DB_EVICTING; 1716fa9e4066Sahrens if ((odb = dbuf_hash_insert(db)) != NULL) { 1717fa9e4066Sahrens /* someone else inserted it first */ 1718fa9e4066Sahrens kmem_cache_free(dbuf_cache, db); 1719fa9e4066Sahrens mutex_exit(&dn->dn_dbufs_mtx); 1720fa9e4066Sahrens return (odb); 1721fa9e4066Sahrens } 1722fa9e4066Sahrens list_insert_head(&dn->dn_dbufs, db); 1723ea8dc4b6Seschrock db->db_state = DB_UNCACHED; 1724fa9e4066Sahrens mutex_exit(&dn->dn_dbufs_mtx); 17255a98e54bSBrendan Gregg - Sun Microsystems arc_space_consume(sizeof (dmu_buf_impl_t), ARC_SPACE_OTHER); 1726fa9e4066Sahrens 1727fa9e4066Sahrens if (parent && parent != dn->dn_dbuf) 1728fa9e4066Sahrens dbuf_add_ref(parent, db); 1729fa9e4066Sahrens 1730ea8dc4b6Seschrock ASSERT(dn->dn_object == DMU_META_DNODE_OBJECT || 1731ea8dc4b6Seschrock refcount_count(&dn->dn_holds) > 0); 1732fa9e4066Sahrens (void) refcount_add(&dn->dn_holds, db); 1733744947dcSTom Erickson (void) atomic_inc_32_nv(&dn->dn_dbufs_count); 1734fa9e4066Sahrens 1735fa9e4066Sahrens dprintf_dbuf(db, "db=%p\n", db); 1736fa9e4066Sahrens 1737fa9e4066Sahrens return (db); 1738fa9e4066Sahrens } 1739fa9e4066Sahrens 1740fa9e4066Sahrens static int 1741ea8dc4b6Seschrock dbuf_do_evict(void *private) 1742fa9e4066Sahrens { 1743ea8dc4b6Seschrock arc_buf_t *buf = private; 1744ea8dc4b6Seschrock dmu_buf_impl_t *db = buf->b_private; 1745fa9e4066Sahrens 1746ea8dc4b6Seschrock if (!MUTEX_HELD(&db->db_mtx)) 1747ea8dc4b6Seschrock mutex_enter(&db->db_mtx); 1748fa9e4066Sahrens 1749ea8dc4b6Seschrock ASSERT(refcount_is_zero(&db->db_holds)); 1750fa9e4066Sahrens 1751ea8dc4b6Seschrock if (db->db_state != DB_EVICTING) { 1752ea8dc4b6Seschrock ASSERT(db->db_state == DB_CACHED); 1753ea8dc4b6Seschrock DBUF_VERIFY(db); 1754ea8dc4b6Seschrock db->db_buf = NULL; 1755ea8dc4b6Seschrock dbuf_evict(db); 1756ea8dc4b6Seschrock } else { 1757ea8dc4b6Seschrock mutex_exit(&db->db_mtx); 1758ea8dc4b6Seschrock dbuf_destroy(db); 1759fa9e4066Sahrens } 1760ea8dc4b6Seschrock return (0); 1761fa9e4066Sahrens } 1762fa9e4066Sahrens 1763fa9e4066Sahrens static void 1764fa9e4066Sahrens dbuf_destroy(dmu_buf_impl_t *db) 1765fa9e4066Sahrens { 1766fa9e4066Sahrens ASSERT(refcount_is_zero(&db->db_holds)); 1767fa9e4066Sahrens 17680a586ceaSMark Shellenbaum if (db->db_blkid != DMU_BONUS_BLKID) { 1769ea8dc4b6Seschrock /* 1770ea8dc4b6Seschrock * If this dbuf is still on the dn_dbufs list, 1771ea8dc4b6Seschrock * remove it from that list. 1772ea8dc4b6Seschrock */ 1773744947dcSTom Erickson if (db->db_dnode_handle != NULL) { 1774744947dcSTom Erickson dnode_t *dn; 17751934e92fSmaybee 1776744947dcSTom Erickson DB_DNODE_ENTER(db); 1777744947dcSTom Erickson dn = DB_DNODE(db); 17781934e92fSmaybee mutex_enter(&dn->dn_dbufs_mtx); 1779ea8dc4b6Seschrock list_remove(&dn->dn_dbufs, db); 1780744947dcSTom Erickson (void) atomic_dec_32_nv(&dn->dn_dbufs_count); 1781c543ec06Sahrens mutex_exit(&dn->dn_dbufs_mtx); 1782744947dcSTom Erickson DB_DNODE_EXIT(db); 1783744947dcSTom Erickson /* 1784744947dcSTom Erickson * Decrementing the dbuf count means that the hold 1785744947dcSTom Erickson * corresponding to the removed dbuf is no longer 1786744947dcSTom Erickson * discounted in dnode_move(), so the dnode cannot be 1787744947dcSTom Erickson * moved until after we release the hold. 1788744947dcSTom Erickson */ 1789ea8dc4b6Seschrock dnode_rele(dn, db); 1790744947dcSTom Erickson db->db_dnode_handle = NULL; 1791ea8dc4b6Seschrock } 1792ea8dc4b6Seschrock dbuf_hash_remove(db); 1793ea8dc4b6Seschrock } 1794ea8dc4b6Seschrock db->db_parent = NULL; 1795ea8dc4b6Seschrock db->db_buf = NULL; 1796ea8dc4b6Seschrock 1797f82bfe17Sgw ASSERT(!list_link_active(&db->db_link)); 1798fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 1799fa9e4066Sahrens ASSERT(db->db_hash_next == NULL); 1800fa9e4066Sahrens ASSERT(db->db_blkptr == NULL); 1801fa9e4066Sahrens ASSERT(db->db_data_pending == NULL); 1802fa9e4066Sahrens 1803fa9e4066Sahrens kmem_cache_free(dbuf_cache, db); 18045a98e54bSBrendan Gregg - Sun Microsystems arc_space_return(sizeof (dmu_buf_impl_t), ARC_SPACE_OTHER); 1805fa9e4066Sahrens } 1806fa9e4066Sahrens 1807fa9e4066Sahrens void 1808fa9e4066Sahrens dbuf_prefetch(dnode_t *dn, uint64_t blkid) 1809fa9e4066Sahrens { 181013506d1eSmaybee dmu_buf_impl_t *db = NULL; 1811fa9e4066Sahrens blkptr_t *bp = NULL; 1812fa9e4066Sahrens 18130a586ceaSMark Shellenbaum ASSERT(blkid != DMU_BONUS_BLKID); 1814fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 1815fa9e4066Sahrens 1816fa9e4066Sahrens if (dnode_block_freed(dn, blkid)) 1817fa9e4066Sahrens return; 1818fa9e4066Sahrens 1819fa9e4066Sahrens /* dbuf_find() returns with db_mtx held */ 1820fa9e4066Sahrens if (db = dbuf_find(dn, 0, blkid)) { 18219e9c486fSGeorge Wilson /* 18229e9c486fSGeorge Wilson * This dbuf is already in the cache. We assume that 18239e9c486fSGeorge Wilson * it is already CACHED, or else about to be either 18249e9c486fSGeorge Wilson * read or filled. 18259e9c486fSGeorge Wilson */ 1826fa9e4066Sahrens mutex_exit(&db->db_mtx); 18279e9c486fSGeorge Wilson return; 1828fa9e4066Sahrens } 1829fa9e4066Sahrens 183013506d1eSmaybee if (dbuf_findbp(dn, 0, blkid, TRUE, &db, &bp) == 0) { 1831fa9e4066Sahrens if (bp && !BP_IS_HOLE(bp)) { 1832c7cd2421SGeorge Wilson int priority = dn->dn_type == DMU_OT_DDT_ZAP ? 1833c7cd2421SGeorge Wilson ZIO_PRIORITY_DDT_PREFETCH : ZIO_PRIORITY_ASYNC_READ; 1834b24ab676SJeff Bonwick dsl_dataset_t *ds = dn->dn_objset->os_dsl_dataset; 183513506d1eSmaybee uint32_t aflags = ARC_NOWAIT | ARC_PREFETCH; 1836ea8dc4b6Seschrock zbookmark_t zb; 1837b24ab676SJeff Bonwick 1838b24ab676SJeff Bonwick SET_BOOKMARK(&zb, ds ? ds->ds_object : DMU_META_OBJSET, 1839b24ab676SJeff Bonwick dn->dn_object, 0, blkid); 1840ea8dc4b6Seschrock 18411b912ec7SGeorge Wilson (void) arc_read(NULL, dn->dn_objset->os_spa, 18421b912ec7SGeorge Wilson bp, NULL, NULL, priority, 1843fa9e4066Sahrens ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE, 184413506d1eSmaybee &aflags, &zb); 1845fa9e4066Sahrens } 184613506d1eSmaybee if (db) 184713506d1eSmaybee dbuf_rele(db, NULL); 1848fa9e4066Sahrens } 1849fa9e4066Sahrens } 1850fa9e4066Sahrens 1851fa9e4066Sahrens /* 1852fa9e4066Sahrens * Returns with db_holds incremented, and db_mtx not held. 1853fa9e4066Sahrens * Note: dn_struct_rwlock must be held. 1854fa9e4066Sahrens */ 1855fa9e4066Sahrens int 1856fa9e4066Sahrens dbuf_hold_impl(dnode_t *dn, uint8_t level, uint64_t blkid, int fail_sparse, 1857fa9e4066Sahrens void *tag, dmu_buf_impl_t **dbp) 1858fa9e4066Sahrens { 1859fa9e4066Sahrens dmu_buf_impl_t *db, *parent = NULL; 1860fa9e4066Sahrens 18610a586ceaSMark Shellenbaum ASSERT(blkid != DMU_BONUS_BLKID); 1862fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 1863fa9e4066Sahrens ASSERT3U(dn->dn_nlevels, >, level); 1864fa9e4066Sahrens 1865fa9e4066Sahrens *dbp = NULL; 1866ea8dc4b6Seschrock top: 1867fa9e4066Sahrens /* dbuf_find() returns with db_mtx held */ 1868fa9e4066Sahrens db = dbuf_find(dn, level, blkid); 1869fa9e4066Sahrens 1870fa9e4066Sahrens if (db == NULL) { 1871fa9e4066Sahrens blkptr_t *bp = NULL; 1872fa9e4066Sahrens int err; 1873fa9e4066Sahrens 1874c543ec06Sahrens ASSERT3P(parent, ==, NULL); 1875fa9e4066Sahrens err = dbuf_findbp(dn, level, blkid, fail_sparse, &parent, &bp); 1876fa9e4066Sahrens if (fail_sparse) { 1877fa9e4066Sahrens if (err == 0 && bp && BP_IS_HOLE(bp)) 1878be6fd75aSMatthew Ahrens err = SET_ERROR(ENOENT); 1879fa9e4066Sahrens if (err) { 1880c543ec06Sahrens if (parent) 1881ea8dc4b6Seschrock dbuf_rele(parent, NULL); 1882fa9e4066Sahrens return (err); 1883fa9e4066Sahrens } 1884fa9e4066Sahrens } 1885ea8dc4b6Seschrock if (err && err != ENOENT) 1886ea8dc4b6Seschrock return (err); 1887fa9e4066Sahrens db = dbuf_create(dn, level, blkid, parent, bp); 1888fa9e4066Sahrens } 1889fa9e4066Sahrens 1890ea8dc4b6Seschrock if (db->db_buf && refcount_is_zero(&db->db_holds)) { 1891ea8dc4b6Seschrock arc_buf_add_ref(db->db_buf, db); 1892ea8dc4b6Seschrock if (db->db_buf->b_data == NULL) { 1893ea8dc4b6Seschrock dbuf_clear(db); 1894c543ec06Sahrens if (parent) { 1895c543ec06Sahrens dbuf_rele(parent, NULL); 1896c543ec06Sahrens parent = NULL; 1897c543ec06Sahrens } 1898ea8dc4b6Seschrock goto top; 1899ea8dc4b6Seschrock } 1900ea8dc4b6Seschrock ASSERT3P(db->db.db_data, ==, db->db_buf->b_data); 1901ea8dc4b6Seschrock } 1902ea8dc4b6Seschrock 1903ea8dc4b6Seschrock ASSERT(db->db_buf == NULL || arc_referenced(db->db_buf)); 1904ea8dc4b6Seschrock 1905fa9e4066Sahrens /* 1906c717a561Smaybee * If this buffer is currently syncing out, and we are are 1907c717a561Smaybee * still referencing it from db_data, we need to make a copy 1908c717a561Smaybee * of it in case we decide we want to dirty it again in this txg. 1909fa9e4066Sahrens */ 19100a586ceaSMark Shellenbaum if (db->db_level == 0 && db->db_blkid != DMU_BONUS_BLKID && 1911ea8dc4b6Seschrock dn->dn_object != DMU_META_DNODE_OBJECT && 1912c717a561Smaybee db->db_state == DB_CACHED && db->db_data_pending) { 1913c717a561Smaybee dbuf_dirty_record_t *dr = db->db_data_pending; 1914fa9e4066Sahrens 1915c717a561Smaybee if (dr->dt.dl.dr_data == db->db_buf) { 1916c717a561Smaybee arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 1917c717a561Smaybee 1918c717a561Smaybee dbuf_set_data(db, 1919744947dcSTom Erickson arc_buf_alloc(dn->dn_objset->os_spa, 1920c717a561Smaybee db->db.db_size, db, type)); 1921c717a561Smaybee bcopy(dr->dt.dl.dr_data->b_data, db->db.db_data, 1922c717a561Smaybee db->db.db_size); 1923c717a561Smaybee } 1924fa9e4066Sahrens } 1925fa9e4066Sahrens 1926ea8dc4b6Seschrock (void) refcount_add(&db->db_holds, tag); 1927fa9e4066Sahrens dbuf_update_data(db); 19289c9dc39aSek DBUF_VERIFY(db); 1929fa9e4066Sahrens mutex_exit(&db->db_mtx); 1930fa9e4066Sahrens 1931fa9e4066Sahrens /* NOTE: we can't rele the parent until after we drop the db_mtx */ 1932c543ec06Sahrens if (parent) 1933ea8dc4b6Seschrock dbuf_rele(parent, NULL); 1934fa9e4066Sahrens 1935744947dcSTom Erickson ASSERT3P(DB_DNODE(db), ==, dn); 1936fa9e4066Sahrens ASSERT3U(db->db_blkid, ==, blkid); 1937fa9e4066Sahrens ASSERT3U(db->db_level, ==, level); 1938fa9e4066Sahrens *dbp = db; 1939fa9e4066Sahrens 1940fa9e4066Sahrens return (0); 1941fa9e4066Sahrens } 1942fa9e4066Sahrens 1943fa9e4066Sahrens dmu_buf_impl_t * 1944ea8dc4b6Seschrock dbuf_hold(dnode_t *dn, uint64_t blkid, void *tag) 1945fa9e4066Sahrens { 1946fa9e4066Sahrens dmu_buf_impl_t *db; 1947ea8dc4b6Seschrock int err = dbuf_hold_impl(dn, 0, blkid, FALSE, tag, &db); 1948ea8dc4b6Seschrock return (err ? NULL : db); 1949fa9e4066Sahrens } 1950fa9e4066Sahrens 1951fa9e4066Sahrens dmu_buf_impl_t * 1952fa9e4066Sahrens dbuf_hold_level(dnode_t *dn, int level, uint64_t blkid, void *tag) 1953fa9e4066Sahrens { 1954fa9e4066Sahrens dmu_buf_impl_t *db; 1955ea8dc4b6Seschrock int err = dbuf_hold_impl(dn, level, blkid, FALSE, tag, &db); 1956ea8dc4b6Seschrock return (err ? NULL : db); 1957fa9e4066Sahrens } 1958fa9e4066Sahrens 19591934e92fSmaybee void 1960ea8dc4b6Seschrock dbuf_create_bonus(dnode_t *dn) 1961fa9e4066Sahrens { 1962ea8dc4b6Seschrock ASSERT(RW_WRITE_HELD(&dn->dn_struct_rwlock)); 1963ea8dc4b6Seschrock 1964ea8dc4b6Seschrock ASSERT(dn->dn_bonus == NULL); 19650a586ceaSMark Shellenbaum dn->dn_bonus = dbuf_create(dn, 0, DMU_BONUS_BLKID, dn->dn_dbuf, NULL); 19660a586ceaSMark Shellenbaum } 19670a586ceaSMark Shellenbaum 19680a586ceaSMark Shellenbaum int 19690a586ceaSMark Shellenbaum dbuf_spill_set_blksz(dmu_buf_t *db_fake, uint64_t blksz, dmu_tx_t *tx) 19700a586ceaSMark Shellenbaum { 19710a586ceaSMark Shellenbaum dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 1972744947dcSTom Erickson dnode_t *dn; 1973744947dcSTom Erickson 19740a586ceaSMark Shellenbaum if (db->db_blkid != DMU_SPILL_BLKID) 1975be6fd75aSMatthew Ahrens return (SET_ERROR(ENOTSUP)); 19760a586ceaSMark Shellenbaum if (blksz == 0) 19770a586ceaSMark Shellenbaum blksz = SPA_MINBLOCKSIZE; 19780a586ceaSMark Shellenbaum if (blksz > SPA_MAXBLOCKSIZE) 19790a586ceaSMark Shellenbaum blksz = SPA_MAXBLOCKSIZE; 19800a586ceaSMark Shellenbaum else 19810a586ceaSMark Shellenbaum blksz = P2ROUNDUP(blksz, SPA_MINBLOCKSIZE); 19820a586ceaSMark Shellenbaum 1983744947dcSTom Erickson DB_DNODE_ENTER(db); 1984744947dcSTom Erickson dn = DB_DNODE(db); 1985744947dcSTom Erickson rw_enter(&dn->dn_struct_rwlock, RW_WRITER); 19860a586ceaSMark Shellenbaum dbuf_new_size(db, blksz, tx); 1987744947dcSTom Erickson rw_exit(&dn->dn_struct_rwlock); 1988744947dcSTom Erickson DB_DNODE_EXIT(db); 19890a586ceaSMark Shellenbaum 19900a586ceaSMark Shellenbaum return (0); 19910a586ceaSMark Shellenbaum } 19920a586ceaSMark Shellenbaum 19930a586ceaSMark Shellenbaum void 19940a586ceaSMark Shellenbaum dbuf_rm_spill(dnode_t *dn, dmu_tx_t *tx) 19950a586ceaSMark Shellenbaum { 19960a586ceaSMark Shellenbaum dbuf_free_range(dn, DMU_SPILL_BLKID, DMU_SPILL_BLKID, tx); 1997fa9e4066Sahrens } 1998fa9e4066Sahrens 1999ea8dc4b6Seschrock #pragma weak dmu_buf_add_ref = dbuf_add_ref 2000fa9e4066Sahrens void 2001fa9e4066Sahrens dbuf_add_ref(dmu_buf_impl_t *db, void *tag) 2002fa9e4066Sahrens { 2003ea8dc4b6Seschrock int64_t holds = refcount_add(&db->db_holds, tag); 2004ea8dc4b6Seschrock ASSERT(holds > 1); 2005fa9e4066Sahrens } 2006fa9e4066Sahrens 2007744947dcSTom Erickson /* 2008744947dcSTom Erickson * If you call dbuf_rele() you had better not be referencing the dnode handle 2009744947dcSTom Erickson * unless you have some other direct or indirect hold on the dnode. (An indirect 2010744947dcSTom Erickson * hold is a hold on one of the dnode's dbufs, including the bonus buffer.) 2011744947dcSTom Erickson * Without that, the dbuf_rele() could lead to a dnode_rele() followed by the 2012744947dcSTom Erickson * dnode's parent dbuf evicting its dnode handles. 2013744947dcSTom Erickson */ 2014ea8dc4b6Seschrock #pragma weak dmu_buf_rele = dbuf_rele 2015fa9e4066Sahrens void 2016ea8dc4b6Seschrock dbuf_rele(dmu_buf_impl_t *db, void *tag) 2017b24ab676SJeff Bonwick { 2018b24ab676SJeff Bonwick mutex_enter(&db->db_mtx); 2019b24ab676SJeff Bonwick dbuf_rele_and_unlock(db, tag); 2020b24ab676SJeff Bonwick } 2021b24ab676SJeff Bonwick 2022b24ab676SJeff Bonwick /* 2023b24ab676SJeff Bonwick * dbuf_rele() for an already-locked dbuf. This is necessary to allow 2024b24ab676SJeff Bonwick * db_dirtycnt and db_holds to be updated atomically. 2025b24ab676SJeff Bonwick */ 2026b24ab676SJeff Bonwick void 2027b24ab676SJeff Bonwick dbuf_rele_and_unlock(dmu_buf_impl_t *db, void *tag) 2028fa9e4066Sahrens { 2029fa9e4066Sahrens int64_t holds; 2030fa9e4066Sahrens 2031b24ab676SJeff Bonwick ASSERT(MUTEX_HELD(&db->db_mtx)); 20329c9dc39aSek DBUF_VERIFY(db); 2033fa9e4066Sahrens 2034744947dcSTom Erickson /* 2035744947dcSTom Erickson * Remove the reference to the dbuf before removing its hold on the 2036744947dcSTom Erickson * dnode so we can guarantee in dnode_move() that a referenced bonus 2037744947dcSTom Erickson * buffer has a corresponding dnode hold. 2038744947dcSTom Erickson */ 2039fa9e4066Sahrens holds = refcount_remove(&db->db_holds, tag); 2040ea8dc4b6Seschrock ASSERT(holds >= 0); 2041ea8dc4b6Seschrock 2042c717a561Smaybee /* 2043c717a561Smaybee * We can't freeze indirects if there is a possibility that they 2044c717a561Smaybee * may be modified in the current syncing context. 2045c717a561Smaybee */ 2046c717a561Smaybee if (db->db_buf && holds == (db->db_level == 0 ? db->db_dirtycnt : 0)) 20476b4acc8bSahrens arc_buf_freeze(db->db_buf); 20486b4acc8bSahrens 2049ea8dc4b6Seschrock if (holds == db->db_dirtycnt && 2050c717a561Smaybee db->db_level == 0 && db->db_immediate_evict) 2051ea8dc4b6Seschrock dbuf_evict_user(db); 2052fa9e4066Sahrens 2053fa9e4066Sahrens if (holds == 0) { 20540a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 2055ea8dc4b6Seschrock mutex_exit(&db->db_mtx); 2056744947dcSTom Erickson 2057744947dcSTom Erickson /* 2058744947dcSTom Erickson * If the dnode moves here, we cannot cross this barrier 2059744947dcSTom Erickson * until the move completes. 2060744947dcSTom Erickson */ 2061744947dcSTom Erickson DB_DNODE_ENTER(db); 2062744947dcSTom Erickson (void) atomic_dec_32_nv(&DB_DNODE(db)->dn_dbufs_count); 2063744947dcSTom Erickson DB_DNODE_EXIT(db); 2064744947dcSTom Erickson /* 2065744947dcSTom Erickson * The bonus buffer's dnode hold is no longer discounted 2066744947dcSTom Erickson * in dnode_move(). The dnode cannot move until after 2067744947dcSTom Erickson * the dnode_rele(). 2068744947dcSTom Erickson */ 2069744947dcSTom Erickson dnode_rele(DB_DNODE(db), db); 2070ea8dc4b6Seschrock } else if (db->db_buf == NULL) { 2071ea8dc4b6Seschrock /* 2072ea8dc4b6Seschrock * This is a special case: we never associated this 2073ea8dc4b6Seschrock * dbuf with any data allocated from the ARC. 2074ea8dc4b6Seschrock */ 207582c9918fSTim Haley ASSERT(db->db_state == DB_UNCACHED || 207682c9918fSTim Haley db->db_state == DB_NOFILL); 2077ea8dc4b6Seschrock dbuf_evict(db); 20786b4acc8bSahrens } else if (arc_released(db->db_buf)) { 2079ea8dc4b6Seschrock arc_buf_t *buf = db->db_buf; 2080ea8dc4b6Seschrock /* 2081ea8dc4b6Seschrock * This dbuf has anonymous data associated with it. 2082ea8dc4b6Seschrock */ 2083ea8dc4b6Seschrock dbuf_set_data(db, NULL); 20843b2aab18SMatthew Ahrens VERIFY(arc_buf_remove_ref(buf, db)); 2085ea8dc4b6Seschrock dbuf_evict(db); 2086ea8dc4b6Seschrock } else { 20873b2aab18SMatthew Ahrens VERIFY(!arc_buf_remove_ref(db->db_buf, db)); 20889253d63dSGeorge Wilson 20899253d63dSGeorge Wilson /* 20909253d63dSGeorge Wilson * A dbuf will be eligible for eviction if either the 20919253d63dSGeorge Wilson * 'primarycache' property is set or a duplicate 20929253d63dSGeorge Wilson * copy of this buffer is already cached in the arc. 20939253d63dSGeorge Wilson * 20949253d63dSGeorge Wilson * In the case of the 'primarycache' a buffer 20959253d63dSGeorge Wilson * is considered for eviction if it matches the 20969253d63dSGeorge Wilson * criteria set in the property. 20979253d63dSGeorge Wilson * 20989253d63dSGeorge Wilson * To decide if our buffer is considered a 20999253d63dSGeorge Wilson * duplicate, we must call into the arc to determine 21009253d63dSGeorge Wilson * if multiple buffers are referencing the same 21019253d63dSGeorge Wilson * block on-disk. If so, then we simply evict 21029253d63dSGeorge Wilson * ourselves. 21039253d63dSGeorge Wilson */ 21049253d63dSGeorge Wilson if (!DBUF_IS_CACHEABLE(db) || 21059253d63dSGeorge Wilson arc_buf_eviction_needed(db->db_buf)) 21063baa08fcSek dbuf_clear(db); 21073baa08fcSek else 21083baa08fcSek mutex_exit(&db->db_mtx); 2109ea8dc4b6Seschrock } 2110fa9e4066Sahrens } else { 2111fa9e4066Sahrens mutex_exit(&db->db_mtx); 2112fa9e4066Sahrens } 2113fa9e4066Sahrens } 2114fa9e4066Sahrens 2115fa9e4066Sahrens #pragma weak dmu_buf_refcount = dbuf_refcount 2116fa9e4066Sahrens uint64_t 2117fa9e4066Sahrens dbuf_refcount(dmu_buf_impl_t *db) 2118fa9e4066Sahrens { 2119fa9e4066Sahrens return (refcount_count(&db->db_holds)); 2120fa9e4066Sahrens } 2121fa9e4066Sahrens 2122fa9e4066Sahrens void * 2123fa9e4066Sahrens dmu_buf_set_user(dmu_buf_t *db_fake, void *user_ptr, void *user_data_ptr_ptr, 2124fa9e4066Sahrens dmu_buf_evict_func_t *evict_func) 2125fa9e4066Sahrens { 2126fa9e4066Sahrens return (dmu_buf_update_user(db_fake, NULL, user_ptr, 2127fa9e4066Sahrens user_data_ptr_ptr, evict_func)); 2128fa9e4066Sahrens } 2129fa9e4066Sahrens 2130fa9e4066Sahrens void * 2131fa9e4066Sahrens dmu_buf_set_user_ie(dmu_buf_t *db_fake, void *user_ptr, void *user_data_ptr_ptr, 2132fa9e4066Sahrens dmu_buf_evict_func_t *evict_func) 2133fa9e4066Sahrens { 2134fa9e4066Sahrens dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 2135fa9e4066Sahrens 2136c717a561Smaybee db->db_immediate_evict = TRUE; 2137fa9e4066Sahrens return (dmu_buf_update_user(db_fake, NULL, user_ptr, 2138fa9e4066Sahrens user_data_ptr_ptr, evict_func)); 2139fa9e4066Sahrens } 2140fa9e4066Sahrens 2141fa9e4066Sahrens void * 2142fa9e4066Sahrens dmu_buf_update_user(dmu_buf_t *db_fake, void *old_user_ptr, void *user_ptr, 2143fa9e4066Sahrens void *user_data_ptr_ptr, dmu_buf_evict_func_t *evict_func) 2144fa9e4066Sahrens { 2145fa9e4066Sahrens dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 2146fa9e4066Sahrens ASSERT(db->db_level == 0); 2147fa9e4066Sahrens 2148fa9e4066Sahrens ASSERT((user_ptr == NULL) == (evict_func == NULL)); 2149fa9e4066Sahrens 2150fa9e4066Sahrens mutex_enter(&db->db_mtx); 2151fa9e4066Sahrens 2152c717a561Smaybee if (db->db_user_ptr == old_user_ptr) { 2153c717a561Smaybee db->db_user_ptr = user_ptr; 2154c717a561Smaybee db->db_user_data_ptr_ptr = user_data_ptr_ptr; 2155c717a561Smaybee db->db_evict_func = evict_func; 2156fa9e4066Sahrens 2157fa9e4066Sahrens dbuf_update_data(db); 2158fa9e4066Sahrens } else { 2159c717a561Smaybee old_user_ptr = db->db_user_ptr; 2160fa9e4066Sahrens } 2161fa9e4066Sahrens 2162fa9e4066Sahrens mutex_exit(&db->db_mtx); 2163fa9e4066Sahrens return (old_user_ptr); 2164fa9e4066Sahrens } 2165fa9e4066Sahrens 2166fa9e4066Sahrens void * 2167fa9e4066Sahrens dmu_buf_get_user(dmu_buf_t *db_fake) 2168fa9e4066Sahrens { 2169fa9e4066Sahrens dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 2170fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 2171fa9e4066Sahrens 2172c717a561Smaybee return (db->db_user_ptr); 2173fa9e4066Sahrens } 2174fa9e4066Sahrens 21753d692628SSanjeev Bagewadi boolean_t 21763d692628SSanjeev Bagewadi dmu_buf_freeable(dmu_buf_t *dbuf) 21773d692628SSanjeev Bagewadi { 21783d692628SSanjeev Bagewadi boolean_t res = B_FALSE; 21793d692628SSanjeev Bagewadi dmu_buf_impl_t *db = (dmu_buf_impl_t *)dbuf; 21803d692628SSanjeev Bagewadi 21813d692628SSanjeev Bagewadi if (db->db_blkptr) 21823d692628SSanjeev Bagewadi res = dsl_dataset_block_freeable(db->db_objset->os_dsl_dataset, 2183c7cd2421SGeorge Wilson db->db_blkptr, db->db_blkptr->blk_birth); 21843d692628SSanjeev Bagewadi 21853d692628SSanjeev Bagewadi return (res); 21863d692628SSanjeev Bagewadi } 21873d692628SSanjeev Bagewadi 218880901aeaSGeorge Wilson blkptr_t * 218980901aeaSGeorge Wilson dmu_buf_get_blkptr(dmu_buf_t *db) 219080901aeaSGeorge Wilson { 219180901aeaSGeorge Wilson dmu_buf_impl_t *dbi = (dmu_buf_impl_t *)db; 219280901aeaSGeorge Wilson return (dbi->db_blkptr); 219380901aeaSGeorge Wilson } 219480901aeaSGeorge Wilson 2195c717a561Smaybee static void 2196c717a561Smaybee dbuf_check_blkptr(dnode_t *dn, dmu_buf_impl_t *db) 2197fa9e4066Sahrens { 2198c717a561Smaybee /* ASSERT(dmu_tx_is_syncing(tx) */ 2199c717a561Smaybee ASSERT(MUTEX_HELD(&db->db_mtx)); 2200c717a561Smaybee 2201c717a561Smaybee if (db->db_blkptr != NULL) 2202c717a561Smaybee return; 2203c717a561Smaybee 22040a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) { 22050a586ceaSMark Shellenbaum db->db_blkptr = &dn->dn_phys->dn_spill; 22060a586ceaSMark Shellenbaum BP_ZERO(db->db_blkptr); 22070a586ceaSMark Shellenbaum return; 22080a586ceaSMark Shellenbaum } 2209c717a561Smaybee if (db->db_level == dn->dn_phys->dn_nlevels-1) { 2210c717a561Smaybee /* 2211c717a561Smaybee * This buffer was allocated at a time when there was 2212c717a561Smaybee * no available blkptrs from the dnode, or it was 2213c717a561Smaybee * inappropriate to hook it in (i.e., nlevels mis-match). 2214c717a561Smaybee */ 2215c717a561Smaybee ASSERT(db->db_blkid < dn->dn_phys->dn_nblkptr); 2216c717a561Smaybee ASSERT(db->db_parent == NULL); 2217c717a561Smaybee db->db_parent = dn->dn_dbuf; 2218c717a561Smaybee db->db_blkptr = &dn->dn_phys->dn_blkptr[db->db_blkid]; 2219c717a561Smaybee DBUF_VERIFY(db); 2220c717a561Smaybee } else { 2221c717a561Smaybee dmu_buf_impl_t *parent = db->db_parent; 2222c717a561Smaybee int epbs = dn->dn_phys->dn_indblkshift - SPA_BLKPTRSHIFT; 2223c717a561Smaybee 2224c717a561Smaybee ASSERT(dn->dn_phys->dn_nlevels > 1); 2225c717a561Smaybee if (parent == NULL) { 2226c717a561Smaybee mutex_exit(&db->db_mtx); 2227c717a561Smaybee rw_enter(&dn->dn_struct_rwlock, RW_READER); 2228c717a561Smaybee (void) dbuf_hold_impl(dn, db->db_level+1, 2229c717a561Smaybee db->db_blkid >> epbs, FALSE, db, &parent); 2230c717a561Smaybee rw_exit(&dn->dn_struct_rwlock); 2231c717a561Smaybee mutex_enter(&db->db_mtx); 2232c717a561Smaybee db->db_parent = parent; 2233c717a561Smaybee } 2234c717a561Smaybee db->db_blkptr = (blkptr_t *)parent->db.db_data + 2235c717a561Smaybee (db->db_blkid & ((1ULL << epbs) - 1)); 2236c717a561Smaybee DBUF_VERIFY(db); 2237c717a561Smaybee } 2238c717a561Smaybee } 2239c717a561Smaybee 2240c717a561Smaybee static void 2241c717a561Smaybee dbuf_sync_indirect(dbuf_dirty_record_t *dr, dmu_tx_t *tx) 2242c717a561Smaybee { 2243c717a561Smaybee dmu_buf_impl_t *db = dr->dr_dbuf; 2244744947dcSTom Erickson dnode_t *dn; 2245c717a561Smaybee zio_t *zio; 2246c717a561Smaybee 2247c717a561Smaybee ASSERT(dmu_tx_is_syncing(tx)); 2248c717a561Smaybee 2249c717a561Smaybee dprintf_dbuf_bp(db, db->db_blkptr, "blkptr=%p", db->db_blkptr); 2250c717a561Smaybee 2251c717a561Smaybee mutex_enter(&db->db_mtx); 2252c717a561Smaybee 2253c717a561Smaybee ASSERT(db->db_level > 0); 2254c717a561Smaybee DBUF_VERIFY(db); 2255c717a561Smaybee 22563e30c24aSWill Andrews /* Read the block if it hasn't been read yet. */ 2257c717a561Smaybee if (db->db_buf == NULL) { 2258c717a561Smaybee mutex_exit(&db->db_mtx); 2259c717a561Smaybee (void) dbuf_read(db, NULL, DB_RF_MUST_SUCCEED); 2260c717a561Smaybee mutex_enter(&db->db_mtx); 2261c717a561Smaybee } 2262c717a561Smaybee ASSERT3U(db->db_state, ==, DB_CACHED); 2263c717a561Smaybee ASSERT(db->db_buf != NULL); 2264c717a561Smaybee 2265744947dcSTom Erickson DB_DNODE_ENTER(db); 2266744947dcSTom Erickson dn = DB_DNODE(db); 22673e30c24aSWill Andrews /* Indirect block size must match what the dnode thinks it is. */ 2268744947dcSTom Erickson ASSERT3U(db->db.db_size, ==, 1<<dn->dn_phys->dn_indblkshift); 2269c717a561Smaybee dbuf_check_blkptr(dn, db); 2270744947dcSTom Erickson DB_DNODE_EXIT(db); 2271c717a561Smaybee 22723e30c24aSWill Andrews /* Provide the pending dirty record to child dbufs */ 2273c717a561Smaybee db->db_data_pending = dr; 2274c717a561Smaybee 2275af2c4821Smaybee mutex_exit(&db->db_mtx); 2276088f3894Sahrens dbuf_write(dr, db->db_buf, tx); 2277c717a561Smaybee 2278c717a561Smaybee zio = dr->dr_zio; 2279c717a561Smaybee mutex_enter(&dr->dt.di.dr_mtx); 2280c717a561Smaybee dbuf_sync_list(&dr->dt.di.dr_children, tx); 2281c717a561Smaybee ASSERT(list_head(&dr->dt.di.dr_children) == NULL); 2282c717a561Smaybee mutex_exit(&dr->dt.di.dr_mtx); 2283c717a561Smaybee zio_nowait(zio); 2284c717a561Smaybee } 2285c717a561Smaybee 2286c717a561Smaybee static void 2287c717a561Smaybee dbuf_sync_leaf(dbuf_dirty_record_t *dr, dmu_tx_t *tx) 2288c717a561Smaybee { 2289c717a561Smaybee arc_buf_t **datap = &dr->dt.dl.dr_data; 2290c717a561Smaybee dmu_buf_impl_t *db = dr->dr_dbuf; 2291744947dcSTom Erickson dnode_t *dn; 2292744947dcSTom Erickson objset_t *os; 2293c717a561Smaybee uint64_t txg = tx->tx_txg; 2294fa9e4066Sahrens 2295fa9e4066Sahrens ASSERT(dmu_tx_is_syncing(tx)); 2296fa9e4066Sahrens 2297fa9e4066Sahrens dprintf_dbuf_bp(db, db->db_blkptr, "blkptr=%p", db->db_blkptr); 2298fa9e4066Sahrens 2299fa9e4066Sahrens mutex_enter(&db->db_mtx); 2300fa9e4066Sahrens /* 2301fa9e4066Sahrens * To be synced, we must be dirtied. But we 2302fa9e4066Sahrens * might have been freed after the dirty. 2303fa9e4066Sahrens */ 2304fa9e4066Sahrens if (db->db_state == DB_UNCACHED) { 2305fa9e4066Sahrens /* This buffer has been freed since it was dirtied */ 2306fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 2307fa9e4066Sahrens } else if (db->db_state == DB_FILL) { 2308fa9e4066Sahrens /* This buffer was freed and is now being re-filled */ 2309c717a561Smaybee ASSERT(db->db.db_data != dr->dt.dl.dr_data); 2310fa9e4066Sahrens } else { 231182c9918fSTim Haley ASSERT(db->db_state == DB_CACHED || db->db_state == DB_NOFILL); 2312fa9e4066Sahrens } 23139c9dc39aSek DBUF_VERIFY(db); 2314fa9e4066Sahrens 2315744947dcSTom Erickson DB_DNODE_ENTER(db); 2316744947dcSTom Erickson dn = DB_DNODE(db); 2317744947dcSTom Erickson 23180a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) { 23190a586ceaSMark Shellenbaum mutex_enter(&dn->dn_mtx); 23200a586ceaSMark Shellenbaum dn->dn_phys->dn_flags |= DNODE_FLAG_SPILL_BLKPTR; 23210a586ceaSMark Shellenbaum mutex_exit(&dn->dn_mtx); 23220a586ceaSMark Shellenbaum } 23230a586ceaSMark Shellenbaum 2324fa9e4066Sahrens /* 2325c717a561Smaybee * If this is a bonus buffer, simply copy the bonus data into the 2326c717a561Smaybee * dnode. It will be written out when the dnode is synced (and it 2327c717a561Smaybee * will be synced, since it must have been dirty for dbuf_sync to 2328c717a561Smaybee * be called). 2329fa9e4066Sahrens */ 23300a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 2331c717a561Smaybee dbuf_dirty_record_t **drp; 23321934e92fSmaybee 2333ea8dc4b6Seschrock ASSERT(*datap != NULL); 2334fb09f5aaSMadhav Suresh ASSERT0(db->db_level); 2335ea8dc4b6Seschrock ASSERT3U(dn->dn_phys->dn_bonuslen, <=, DN_MAX_BONUSLEN); 2336ea8dc4b6Seschrock bcopy(*datap, DN_BONUS(dn->dn_phys), dn->dn_phys->dn_bonuslen); 2337744947dcSTom Erickson DB_DNODE_EXIT(db); 2338744947dcSTom Erickson 23390e8c6158Smaybee if (*datap != db->db.db_data) { 2340ea8dc4b6Seschrock zio_buf_free(*datap, DN_MAX_BONUSLEN); 23415a98e54bSBrendan Gregg - Sun Microsystems arc_space_return(DN_MAX_BONUSLEN, ARC_SPACE_OTHER); 23420e8c6158Smaybee } 2343ea8dc4b6Seschrock db->db_data_pending = NULL; 2344c717a561Smaybee drp = &db->db_last_dirty; 2345c717a561Smaybee while (*drp != dr) 2346c717a561Smaybee drp = &(*drp)->dr_next; 234717f17c2dSbonwick ASSERT(dr->dr_next == NULL); 2348b24ab676SJeff Bonwick ASSERT(dr->dr_dbuf == db); 234917f17c2dSbonwick *drp = dr->dr_next; 2350c717a561Smaybee kmem_free(dr, sizeof (dbuf_dirty_record_t)); 2351ea8dc4b6Seschrock ASSERT(db->db_dirtycnt > 0); 2352ea8dc4b6Seschrock db->db_dirtycnt -= 1; 2353b24ab676SJeff Bonwick dbuf_rele_and_unlock(db, (void *)(uintptr_t)txg); 2354ea8dc4b6Seschrock return; 2355ea8dc4b6Seschrock } 2356ea8dc4b6Seschrock 2357744947dcSTom Erickson os = dn->dn_objset; 2358744947dcSTom Erickson 2359f82bfe17Sgw /* 2360f82bfe17Sgw * This function may have dropped the db_mtx lock allowing a dmu_sync 2361f82bfe17Sgw * operation to sneak in. As a result, we need to ensure that we 2362f82bfe17Sgw * don't check the dr_override_state until we have returned from 2363f82bfe17Sgw * dbuf_check_blkptr. 2364f82bfe17Sgw */ 2365f82bfe17Sgw dbuf_check_blkptr(dn, db); 2366f82bfe17Sgw 2367c717a561Smaybee /* 2368744947dcSTom Erickson * If this buffer is in the middle of an immediate write, 2369c717a561Smaybee * wait for the synchronous IO to complete. 2370c717a561Smaybee */ 2371c717a561Smaybee while (dr->dt.dl.dr_override_state == DR_IN_DMU_SYNC) { 2372c717a561Smaybee ASSERT(dn->dn_object != DMU_META_DNODE_OBJECT); 2373c717a561Smaybee cv_wait(&db->db_changed, &db->db_mtx); 2374c717a561Smaybee ASSERT(dr->dt.dl.dr_override_state != DR_NOT_OVERRIDDEN); 2375c717a561Smaybee } 2376c5c6ffa0Smaybee 2377ab69d62fSMatthew Ahrens if (db->db_state != DB_NOFILL && 2378ab69d62fSMatthew Ahrens dn->dn_object != DMU_META_DNODE_OBJECT && 2379ab69d62fSMatthew Ahrens refcount_count(&db->db_holds) > 1 && 2380b24ab676SJeff Bonwick dr->dt.dl.dr_override_state != DR_OVERRIDDEN && 2381ab69d62fSMatthew Ahrens *datap == db->db_buf) { 2382ab69d62fSMatthew Ahrens /* 2383ab69d62fSMatthew Ahrens * If this buffer is currently "in use" (i.e., there 2384ab69d62fSMatthew Ahrens * are active holds and db_data still references it), 2385ab69d62fSMatthew Ahrens * then make a copy before we start the write so that 2386ab69d62fSMatthew Ahrens * any modifications from the open txg will not leak 2387ab69d62fSMatthew Ahrens * into this write. 2388ab69d62fSMatthew Ahrens * 2389ab69d62fSMatthew Ahrens * NOTE: this copy does not need to be made for 2390ab69d62fSMatthew Ahrens * objects only modified in the syncing context (e.g. 2391ab69d62fSMatthew Ahrens * DNONE_DNODE blocks). 2392ab69d62fSMatthew Ahrens */ 2393ab69d62fSMatthew Ahrens int blksz = arc_buf_size(*datap); 2394ab69d62fSMatthew Ahrens arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 2395ab69d62fSMatthew Ahrens *datap = arc_buf_alloc(os->os_spa, blksz, db, type); 2396ab69d62fSMatthew Ahrens bcopy(db->db.db_data, (*datap)->b_data, blksz); 239782c9918fSTim Haley } 2398c717a561Smaybee db->db_data_pending = dr; 2399fa9e4066Sahrens 2400c717a561Smaybee mutex_exit(&db->db_mtx); 2401fa9e4066Sahrens 2402088f3894Sahrens dbuf_write(dr, *datap, tx); 2403fa9e4066Sahrens 2404c717a561Smaybee ASSERT(!list_link_active(&dr->dr_dirty_node)); 2405744947dcSTom Erickson if (dn->dn_object == DMU_META_DNODE_OBJECT) { 2406c717a561Smaybee list_insert_tail(&dn->dn_dirty_records[txg&TXG_MASK], dr); 2407744947dcSTom Erickson DB_DNODE_EXIT(db); 2408744947dcSTom Erickson } else { 2409744947dcSTom Erickson /* 2410744947dcSTom Erickson * Although zio_nowait() does not "wait for an IO", it does 2411744947dcSTom Erickson * initiate the IO. If this is an empty write it seems plausible 2412744947dcSTom Erickson * that the IO could actually be completed before the nowait 2413744947dcSTom Erickson * returns. We need to DB_DNODE_EXIT() first in case 2414744947dcSTom Erickson * zio_nowait() invalidates the dbuf. 2415744947dcSTom Erickson */ 2416744947dcSTom Erickson DB_DNODE_EXIT(db); 2417c717a561Smaybee zio_nowait(dr->dr_zio); 2418744947dcSTom Erickson } 2419c717a561Smaybee } 242023b11526Smaybee 2421c717a561Smaybee void 2422c717a561Smaybee dbuf_sync_list(list_t *list, dmu_tx_t *tx) 2423c717a561Smaybee { 2424c717a561Smaybee dbuf_dirty_record_t *dr; 2425c717a561Smaybee 2426c717a561Smaybee while (dr = list_head(list)) { 2427c717a561Smaybee if (dr->dr_zio != NULL) { 2428c717a561Smaybee /* 2429c717a561Smaybee * If we find an already initialized zio then we 2430c717a561Smaybee * are processing the meta-dnode, and we have finished. 2431c717a561Smaybee * The dbufs for all dnodes are put back on the list 2432c717a561Smaybee * during processing, so that we can zio_wait() 2433c717a561Smaybee * these IOs after initiating all child IOs. 2434c717a561Smaybee */ 2435c717a561Smaybee ASSERT3U(dr->dr_dbuf->db.db_object, ==, 2436c717a561Smaybee DMU_META_DNODE_OBJECT); 2437c717a561Smaybee break; 243823b11526Smaybee } 2439c717a561Smaybee list_remove(list, dr); 2440c717a561Smaybee if (dr->dr_dbuf->db_level > 0) 2441c717a561Smaybee dbuf_sync_indirect(dr, tx); 2442c717a561Smaybee else 2443c717a561Smaybee dbuf_sync_leaf(dr, tx); 244423b11526Smaybee } 2445c717a561Smaybee } 244623b11526Smaybee 2447fa9e4066Sahrens /* ARGSUSED */ 2448fa9e4066Sahrens static void 2449c717a561Smaybee dbuf_write_ready(zio_t *zio, arc_buf_t *buf, void *vdb) 2450fa9e4066Sahrens { 2451fa9e4066Sahrens dmu_buf_impl_t *db = vdb; 2452744947dcSTom Erickson dnode_t *dn; 2453e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 2454c717a561Smaybee blkptr_t *bp_orig = &zio->io_bp_orig; 2455b24ab676SJeff Bonwick spa_t *spa = zio->io_spa; 2456b24ab676SJeff Bonwick int64_t delta; 2457fa9e4066Sahrens uint64_t fill = 0; 2458b24ab676SJeff Bonwick int i; 2459fa9e4066Sahrens 2460e14bb325SJeff Bonwick ASSERT(db->db_blkptr == bp); 2461e14bb325SJeff Bonwick 2462744947dcSTom Erickson DB_DNODE_ENTER(db); 2463744947dcSTom Erickson dn = DB_DNODE(db); 2464b24ab676SJeff Bonwick delta = bp_get_dsize_sync(spa, bp) - bp_get_dsize_sync(spa, bp_orig); 2465b24ab676SJeff Bonwick dnode_diduse_space(dn, delta - zio->io_prev_space_delta); 2466b24ab676SJeff Bonwick zio->io_prev_space_delta = delta; 2467fa9e4066Sahrens 2468e14bb325SJeff Bonwick if (BP_IS_HOLE(bp)) { 2469b24ab676SJeff Bonwick ASSERT(bp->blk_fill == 0); 2470744947dcSTom Erickson DB_DNODE_EXIT(db); 2471c717a561Smaybee return; 2472c717a561Smaybee } 2473c5c6ffa0Smaybee 24740a586ceaSMark Shellenbaum ASSERT((db->db_blkid != DMU_SPILL_BLKID && 24750a586ceaSMark Shellenbaum BP_GET_TYPE(bp) == dn->dn_type) || 24760a586ceaSMark Shellenbaum (db->db_blkid == DMU_SPILL_BLKID && 24770a586ceaSMark Shellenbaum BP_GET_TYPE(bp) == dn->dn_bonustype)); 2478e14bb325SJeff Bonwick ASSERT(BP_GET_LEVEL(bp) == db->db_level); 2479e14bb325SJeff Bonwick 2480c717a561Smaybee mutex_enter(&db->db_mtx); 2481fa9e4066Sahrens 24820a586ceaSMark Shellenbaum #ifdef ZFS_DEBUG 24830a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) { 24840a586ceaSMark Shellenbaum ASSERT(dn->dn_phys->dn_flags & DNODE_FLAG_SPILL_BLKPTR); 24850a586ceaSMark Shellenbaum ASSERT(!(BP_IS_HOLE(db->db_blkptr)) && 24860a586ceaSMark Shellenbaum db->db_blkptr == &dn->dn_phys->dn_spill); 24870a586ceaSMark Shellenbaum } 24880a586ceaSMark Shellenbaum #endif 24890a586ceaSMark Shellenbaum 2490fa9e4066Sahrens if (db->db_level == 0) { 2491fa9e4066Sahrens mutex_enter(&dn->dn_mtx); 24920a586ceaSMark Shellenbaum if (db->db_blkid > dn->dn_phys->dn_maxblkid && 24930a586ceaSMark Shellenbaum db->db_blkid != DMU_SPILL_BLKID) 2494fa9e4066Sahrens dn->dn_phys->dn_maxblkid = db->db_blkid; 2495fa9e4066Sahrens mutex_exit(&dn->dn_mtx); 2496fa9e4066Sahrens 2497fa9e4066Sahrens if (dn->dn_type == DMU_OT_DNODE) { 2498fa9e4066Sahrens dnode_phys_t *dnp = db->db.db_data; 2499fa9e4066Sahrens for (i = db->db.db_size >> DNODE_SHIFT; i > 0; 2500fa9e4066Sahrens i--, dnp++) { 2501fa9e4066Sahrens if (dnp->dn_type != DMU_OT_NONE) 2502fa9e4066Sahrens fill++; 2503fa9e4066Sahrens } 2504fa9e4066Sahrens } else { 2505c717a561Smaybee fill = 1; 2506fa9e4066Sahrens } 2507fa9e4066Sahrens } else { 2508e14bb325SJeff Bonwick blkptr_t *ibp = db->db.db_data; 2509fa9e4066Sahrens ASSERT3U(db->db.db_size, ==, 1<<dn->dn_phys->dn_indblkshift); 2510e14bb325SJeff Bonwick for (i = db->db.db_size >> SPA_BLKPTRSHIFT; i > 0; i--, ibp++) { 2511e14bb325SJeff Bonwick if (BP_IS_HOLE(ibp)) 2512fa9e4066Sahrens continue; 2513e14bb325SJeff Bonwick fill += ibp->blk_fill; 2514fa9e4066Sahrens } 2515fa9e4066Sahrens } 2516744947dcSTom Erickson DB_DNODE_EXIT(db); 2517fa9e4066Sahrens 2518e14bb325SJeff Bonwick bp->blk_fill = fill; 2519c717a561Smaybee 2520c717a561Smaybee mutex_exit(&db->db_mtx); 2521c717a561Smaybee } 2522fa9e4066Sahrens 2523c717a561Smaybee /* ARGSUSED */ 2524c717a561Smaybee static void 2525c717a561Smaybee dbuf_write_done(zio_t *zio, arc_buf_t *buf, void *vdb) 2526c717a561Smaybee { 2527c717a561Smaybee dmu_buf_impl_t *db = vdb; 2528b24ab676SJeff Bonwick blkptr_t *bp = zio->io_bp; 2529b24ab676SJeff Bonwick blkptr_t *bp_orig = &zio->io_bp_orig; 2530c717a561Smaybee uint64_t txg = zio->io_txg; 2531c717a561Smaybee dbuf_dirty_record_t **drp, *dr; 2532c717a561Smaybee 2533fb09f5aaSMadhav Suresh ASSERT0(zio->io_error); 2534b24ab676SJeff Bonwick ASSERT(db->db_blkptr == bp); 2535b24ab676SJeff Bonwick 253680901aeaSGeorge Wilson /* 253780901aeaSGeorge Wilson * For nopwrites and rewrites we ensure that the bp matches our 253880901aeaSGeorge Wilson * original and bypass all the accounting. 253980901aeaSGeorge Wilson */ 254080901aeaSGeorge Wilson if (zio->io_flags & (ZIO_FLAG_IO_REWRITE | ZIO_FLAG_NOPWRITE)) { 2541b24ab676SJeff Bonwick ASSERT(BP_EQUAL(bp, bp_orig)); 2542b24ab676SJeff Bonwick } else { 2543744947dcSTom Erickson objset_t *os; 2544744947dcSTom Erickson dsl_dataset_t *ds; 2545744947dcSTom Erickson dmu_tx_t *tx; 2546744947dcSTom Erickson 2547744947dcSTom Erickson DB_GET_OBJSET(&os, db); 2548744947dcSTom Erickson ds = os->os_dsl_dataset; 2549744947dcSTom Erickson tx = os->os_synctx; 2550b24ab676SJeff Bonwick 2551b24ab676SJeff Bonwick (void) dsl_dataset_block_kill(ds, bp_orig, tx, B_TRUE); 2552b24ab676SJeff Bonwick dsl_dataset_block_born(ds, bp, tx); 2553b24ab676SJeff Bonwick } 2554c717a561Smaybee 2555c717a561Smaybee mutex_enter(&db->db_mtx); 2556c717a561Smaybee 2557b24ab676SJeff Bonwick DBUF_VERIFY(db); 2558b24ab676SJeff Bonwick 2559c717a561Smaybee drp = &db->db_last_dirty; 256017f17c2dSbonwick while ((dr = *drp) != db->db_data_pending) 256117f17c2dSbonwick drp = &dr->dr_next; 256217f17c2dSbonwick ASSERT(!list_link_active(&dr->dr_dirty_node)); 256317f17c2dSbonwick ASSERT(dr->dr_txg == txg); 2564b24ab676SJeff Bonwick ASSERT(dr->dr_dbuf == db); 256517f17c2dSbonwick ASSERT(dr->dr_next == NULL); 256617f17c2dSbonwick *drp = dr->dr_next; 2567c717a561Smaybee 25680a586ceaSMark Shellenbaum #ifdef ZFS_DEBUG 25690a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) { 2570744947dcSTom Erickson dnode_t *dn; 2571744947dcSTom Erickson 2572744947dcSTom Erickson DB_DNODE_ENTER(db); 2573744947dcSTom Erickson dn = DB_DNODE(db); 25740a586ceaSMark Shellenbaum ASSERT(dn->dn_phys->dn_flags & DNODE_FLAG_SPILL_BLKPTR); 25750a586ceaSMark Shellenbaum ASSERT(!(BP_IS_HOLE(db->db_blkptr)) && 25760a586ceaSMark Shellenbaum db->db_blkptr == &dn->dn_phys->dn_spill); 2577744947dcSTom Erickson DB_DNODE_EXIT(db); 25780a586ceaSMark Shellenbaum } 25790a586ceaSMark Shellenbaum #endif 25800a586ceaSMark Shellenbaum 2581c717a561Smaybee if (db->db_level == 0) { 25820a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 2583c717a561Smaybee ASSERT(dr->dt.dl.dr_override_state == DR_NOT_OVERRIDDEN); 258482c9918fSTim Haley if (db->db_state != DB_NOFILL) { 258582c9918fSTim Haley if (dr->dt.dl.dr_data != db->db_buf) 258682c9918fSTim Haley VERIFY(arc_buf_remove_ref(dr->dt.dl.dr_data, 25873b2aab18SMatthew Ahrens db)); 2588b24ab676SJeff Bonwick else if (!arc_released(db->db_buf)) 258982c9918fSTim Haley arc_set_callback(db->db_buf, dbuf_do_evict, db); 259082c9918fSTim Haley } 2591c717a561Smaybee } else { 2592744947dcSTom Erickson dnode_t *dn; 2593744947dcSTom Erickson 2594744947dcSTom Erickson DB_DNODE_ENTER(db); 2595744947dcSTom Erickson dn = DB_DNODE(db); 2596c717a561Smaybee ASSERT(list_head(&dr->dt.di.dr_children) == NULL); 2597c717a561Smaybee ASSERT3U(db->db.db_size, ==, 1<<dn->dn_phys->dn_indblkshift); 2598c717a561Smaybee if (!BP_IS_HOLE(db->db_blkptr)) { 2599c717a561Smaybee int epbs = 2600c717a561Smaybee dn->dn_phys->dn_indblkshift - SPA_BLKPTRSHIFT; 2601c717a561Smaybee ASSERT3U(BP_GET_LSIZE(db->db_blkptr), ==, 2602c717a561Smaybee db->db.db_size); 2603c717a561Smaybee ASSERT3U(dn->dn_phys->dn_maxblkid 2604c717a561Smaybee >> (db->db_level * epbs), >=, db->db_blkid); 2605c717a561Smaybee arc_set_callback(db->db_buf, dbuf_do_evict, db); 2606c717a561Smaybee } 2607744947dcSTom Erickson DB_DNODE_EXIT(db); 2608c25056deSgw mutex_destroy(&dr->dt.di.dr_mtx); 2609c25056deSgw list_destroy(&dr->dt.di.dr_children); 2610c717a561Smaybee } 2611c717a561Smaybee kmem_free(dr, sizeof (dbuf_dirty_record_t)); 2612fa9e4066Sahrens 2613fa9e4066Sahrens cv_broadcast(&db->db_changed); 2614fa9e4066Sahrens ASSERT(db->db_dirtycnt > 0); 2615fa9e4066Sahrens db->db_dirtycnt -= 1; 2616c717a561Smaybee db->db_data_pending = NULL; 2617b24ab676SJeff Bonwick dbuf_rele_and_unlock(db, (void *)(uintptr_t)txg); 2618b24ab676SJeff Bonwick } 2619b24ab676SJeff Bonwick 2620b24ab676SJeff Bonwick static void 2621b24ab676SJeff Bonwick dbuf_write_nofill_ready(zio_t *zio) 2622b24ab676SJeff Bonwick { 2623b24ab676SJeff Bonwick dbuf_write_ready(zio, NULL, zio->io_private); 2624b24ab676SJeff Bonwick } 2625b24ab676SJeff Bonwick 2626b24ab676SJeff Bonwick static void 2627b24ab676SJeff Bonwick dbuf_write_nofill_done(zio_t *zio) 2628b24ab676SJeff Bonwick { 2629b24ab676SJeff Bonwick dbuf_write_done(zio, NULL, zio->io_private); 2630b24ab676SJeff Bonwick } 2631b24ab676SJeff Bonwick 2632b24ab676SJeff Bonwick static void 2633b24ab676SJeff Bonwick dbuf_write_override_ready(zio_t *zio) 2634b24ab676SJeff Bonwick { 2635b24ab676SJeff Bonwick dbuf_dirty_record_t *dr = zio->io_private; 2636b24ab676SJeff Bonwick dmu_buf_impl_t *db = dr->dr_dbuf; 2637b24ab676SJeff Bonwick 2638b24ab676SJeff Bonwick dbuf_write_ready(zio, NULL, db); 2639b24ab676SJeff Bonwick } 2640b24ab676SJeff Bonwick 2641b24ab676SJeff Bonwick static void 2642b24ab676SJeff Bonwick dbuf_write_override_done(zio_t *zio) 2643b24ab676SJeff Bonwick { 2644b24ab676SJeff Bonwick dbuf_dirty_record_t *dr = zio->io_private; 2645b24ab676SJeff Bonwick dmu_buf_impl_t *db = dr->dr_dbuf; 2646b24ab676SJeff Bonwick blkptr_t *obp = &dr->dt.dl.dr_overridden_by; 2647b24ab676SJeff Bonwick 2648b24ab676SJeff Bonwick mutex_enter(&db->db_mtx); 2649b24ab676SJeff Bonwick if (!BP_EQUAL(zio->io_bp, obp)) { 2650b24ab676SJeff Bonwick if (!BP_IS_HOLE(obp)) 2651b24ab676SJeff Bonwick dsl_free(spa_get_dsl(zio->io_spa), zio->io_txg, obp); 2652b24ab676SJeff Bonwick arc_release(dr->dt.dl.dr_data, db); 2653b24ab676SJeff Bonwick } 2654fa9e4066Sahrens mutex_exit(&db->db_mtx); 2655fa9e4066Sahrens 2656b24ab676SJeff Bonwick dbuf_write_done(zio, NULL, db); 2657b24ab676SJeff Bonwick } 2658b24ab676SJeff Bonwick 26593e30c24aSWill Andrews /* Issue I/O to commit a dirty buffer to disk. */ 2660b24ab676SJeff Bonwick static void 2661b24ab676SJeff Bonwick dbuf_write(dbuf_dirty_record_t *dr, arc_buf_t *data, dmu_tx_t *tx) 2662b24ab676SJeff Bonwick { 2663b24ab676SJeff Bonwick dmu_buf_impl_t *db = dr->dr_dbuf; 2664744947dcSTom Erickson dnode_t *dn; 2665744947dcSTom Erickson objset_t *os; 2666b24ab676SJeff Bonwick dmu_buf_impl_t *parent = db->db_parent; 2667b24ab676SJeff Bonwick uint64_t txg = tx->tx_txg; 2668b24ab676SJeff Bonwick zbookmark_t zb; 2669b24ab676SJeff Bonwick zio_prop_t zp; 2670b24ab676SJeff Bonwick zio_t *zio; 26710a586ceaSMark Shellenbaum int wp_flag = 0; 2672b24ab676SJeff Bonwick 2673744947dcSTom Erickson DB_DNODE_ENTER(db); 2674744947dcSTom Erickson dn = DB_DNODE(db); 2675744947dcSTom Erickson os = dn->dn_objset; 2676744947dcSTom Erickson 2677b24ab676SJeff Bonwick if (db->db_state != DB_NOFILL) { 2678b24ab676SJeff Bonwick if (db->db_level > 0 || dn->dn_type == DMU_OT_DNODE) { 2679b24ab676SJeff Bonwick /* 2680b24ab676SJeff Bonwick * Private object buffers are released here rather 2681b24ab676SJeff Bonwick * than in dbuf_dirty() since they are only modified 2682b24ab676SJeff Bonwick * in the syncing context and we don't want the 2683b24ab676SJeff Bonwick * overhead of making multiple copies of the data. 2684b24ab676SJeff Bonwick */ 2685b24ab676SJeff Bonwick if (BP_IS_HOLE(db->db_blkptr)) { 2686b24ab676SJeff Bonwick arc_buf_thaw(data); 2687b24ab676SJeff Bonwick } else { 26883f9d6ad7SLin Ling dbuf_release_bp(db); 2689b24ab676SJeff Bonwick } 2690b24ab676SJeff Bonwick } 2691b24ab676SJeff Bonwick } 2692b24ab676SJeff Bonwick 2693b24ab676SJeff Bonwick if (parent != dn->dn_dbuf) { 26943e30c24aSWill Andrews /* Our parent is an indirect block. */ 26953e30c24aSWill Andrews /* We have a dirty parent that has been scheduled for write. */ 2696b24ab676SJeff Bonwick ASSERT(parent && parent->db_data_pending); 26973e30c24aSWill Andrews /* Our parent's buffer is one level closer to the dnode. */ 2698b24ab676SJeff Bonwick ASSERT(db->db_level == parent->db_level-1); 26993e30c24aSWill Andrews /* 27003e30c24aSWill Andrews * We're about to modify our parent's db_data by modifying 27013e30c24aSWill Andrews * our block pointer, so the parent must be released. 27023e30c24aSWill Andrews */ 2703b24ab676SJeff Bonwick ASSERT(arc_released(parent->db_buf)); 2704b24ab676SJeff Bonwick zio = parent->db_data_pending->dr_zio; 2705b24ab676SJeff Bonwick } else { 27063e30c24aSWill Andrews /* Our parent is the dnode itself. */ 27070a586ceaSMark Shellenbaum ASSERT((db->db_level == dn->dn_phys->dn_nlevels-1 && 27080a586ceaSMark Shellenbaum db->db_blkid != DMU_SPILL_BLKID) || 27090a586ceaSMark Shellenbaum (db->db_blkid == DMU_SPILL_BLKID && db->db_level == 0)); 27100a586ceaSMark Shellenbaum if (db->db_blkid != DMU_SPILL_BLKID) 27110a586ceaSMark Shellenbaum ASSERT3P(db->db_blkptr, ==, 27120a586ceaSMark Shellenbaum &dn->dn_phys->dn_blkptr[db->db_blkid]); 2713b24ab676SJeff Bonwick zio = dn->dn_zio; 2714b24ab676SJeff Bonwick } 2715b24ab676SJeff Bonwick 2716b24ab676SJeff Bonwick ASSERT(db->db_level == 0 || data == db->db_buf); 2717b24ab676SJeff Bonwick ASSERT3U(db->db_blkptr->blk_birth, <=, txg); 2718b24ab676SJeff Bonwick ASSERT(zio); 2719fa9e4066Sahrens 2720b24ab676SJeff Bonwick SET_BOOKMARK(&zb, os->os_dsl_dataset ? 2721b24ab676SJeff Bonwick os->os_dsl_dataset->ds_object : DMU_META_OBJSET, 2722b24ab676SJeff Bonwick db->db.db_object, db->db_level, db->db_blkid); 2723b24ab676SJeff Bonwick 27240a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) 27250a586ceaSMark Shellenbaum wp_flag = WP_SPILL; 27260a586ceaSMark Shellenbaum wp_flag |= (db->db_state == DB_NOFILL) ? WP_NOFILL : 0; 27270a586ceaSMark Shellenbaum 27280a586ceaSMark Shellenbaum dmu_write_policy(os, dn, db->db_level, wp_flag, &zp); 2729744947dcSTom Erickson DB_DNODE_EXIT(db); 2730b24ab676SJeff Bonwick 2731b24ab676SJeff Bonwick if (db->db_level == 0 && dr->dt.dl.dr_override_state == DR_OVERRIDDEN) { 2732b24ab676SJeff Bonwick ASSERT(db->db_state != DB_NOFILL); 2733b24ab676SJeff Bonwick dr->dr_zio = zio_write(zio, os->os_spa, txg, 2734b24ab676SJeff Bonwick db->db_blkptr, data->b_data, arc_buf_size(data), &zp, 2735b24ab676SJeff Bonwick dbuf_write_override_ready, dbuf_write_override_done, dr, 2736b24ab676SJeff Bonwick ZIO_PRIORITY_ASYNC_WRITE, ZIO_FLAG_MUSTSUCCEED, &zb); 2737b24ab676SJeff Bonwick mutex_enter(&db->db_mtx); 2738b24ab676SJeff Bonwick dr->dt.dl.dr_override_state = DR_NOT_OVERRIDDEN; 2739b24ab676SJeff Bonwick zio_write_override(dr->dr_zio, &dr->dt.dl.dr_overridden_by, 274080901aeaSGeorge Wilson dr->dt.dl.dr_copies, dr->dt.dl.dr_nopwrite); 2741b24ab676SJeff Bonwick mutex_exit(&db->db_mtx); 2742b24ab676SJeff Bonwick } else if (db->db_state == DB_NOFILL) { 2743b24ab676SJeff Bonwick ASSERT(zp.zp_checksum == ZIO_CHECKSUM_OFF); 2744b24ab676SJeff Bonwick dr->dr_zio = zio_write(zio, os->os_spa, txg, 2745b24ab676SJeff Bonwick db->db_blkptr, NULL, db->db.db_size, &zp, 2746b24ab676SJeff Bonwick dbuf_write_nofill_ready, dbuf_write_nofill_done, db, 2747b24ab676SJeff Bonwick ZIO_PRIORITY_ASYNC_WRITE, 2748b24ab676SJeff Bonwick ZIO_FLAG_MUSTSUCCEED | ZIO_FLAG_NODATA, &zb); 2749b24ab676SJeff Bonwick } else { 2750b24ab676SJeff Bonwick ASSERT(arc_released(data)); 2751b24ab676SJeff Bonwick dr->dr_zio = arc_write(zio, os->os_spa, txg, 2752aad02571SSaso Kiselkov db->db_blkptr, data, DBUF_IS_L2CACHEABLE(db), 2753aad02571SSaso Kiselkov DBUF_IS_L2COMPRESSIBLE(db), &zp, dbuf_write_ready, 2754aad02571SSaso Kiselkov dbuf_write_done, db, ZIO_PRIORITY_ASYNC_WRITE, 2755aad02571SSaso Kiselkov ZIO_FLAG_MUSTSUCCEED, &zb); 2756b24ab676SJeff Bonwick } 2757fa9e4066Sahrens } 2758