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. 26810e43b2SBill Pijewski * Copyright (c) 2013, Joyent, Inc. All rights reserved. 27fa9e4066Sahrens */ 28fa9e4066Sahrens 29fa9e4066Sahrens #include <sys/zfs_context.h> 30fa9e4066Sahrens #include <sys/dmu.h> 312f3d8780SMatthew Ahrens #include <sys/dmu_send.h> 32fa9e4066Sahrens #include <sys/dmu_impl.h> 33fa9e4066Sahrens #include <sys/dbuf.h> 34fa9e4066Sahrens #include <sys/dmu_objset.h> 35fa9e4066Sahrens #include <sys/dsl_dataset.h> 36fa9e4066Sahrens #include <sys/dsl_dir.h> 37fa9e4066Sahrens #include <sys/dmu_tx.h> 38fa9e4066Sahrens #include <sys/spa.h> 39fa9e4066Sahrens #include <sys/zio.h> 40fa9e4066Sahrens #include <sys/dmu_zfetch.h> 410a586ceaSMark Shellenbaum #include <sys/sa.h> 420a586ceaSMark Shellenbaum #include <sys/sa_impl.h> 43fa9e4066Sahrens 44713d6c20SMatthew Ahrens /* 45713d6c20SMatthew Ahrens * Number of times that zfs_free_range() took the slow path while doing 46713d6c20SMatthew Ahrens * a zfs receive. A nonzero value indicates a potential performance problem. 47713d6c20SMatthew Ahrens */ 48713d6c20SMatthew Ahrens uint64_t zfs_free_range_recv_miss; 49713d6c20SMatthew Ahrens 50fa9e4066Sahrens static void dbuf_destroy(dmu_buf_impl_t *db); 513b2aab18SMatthew Ahrens static boolean_t dbuf_undirty(dmu_buf_impl_t *db, dmu_tx_t *tx); 52088f3894Sahrens static void dbuf_write(dbuf_dirty_record_t *dr, arc_buf_t *data, dmu_tx_t *tx); 53fa9e4066Sahrens 54fa9e4066Sahrens /* 55fa9e4066Sahrens * Global data structures and functions for the dbuf cache. 56fa9e4066Sahrens */ 57fa9e4066Sahrens static kmem_cache_t *dbuf_cache; 58fa9e4066Sahrens 59fa9e4066Sahrens /* ARGSUSED */ 60fa9e4066Sahrens static int 61fa9e4066Sahrens dbuf_cons(void *vdb, void *unused, int kmflag) 62fa9e4066Sahrens { 63fa9e4066Sahrens dmu_buf_impl_t *db = vdb; 64fa9e4066Sahrens bzero(db, sizeof (dmu_buf_impl_t)); 65fa9e4066Sahrens 66fa9e4066Sahrens mutex_init(&db->db_mtx, NULL, MUTEX_DEFAULT, NULL); 67fa9e4066Sahrens cv_init(&db->db_changed, NULL, CV_DEFAULT, NULL); 68fa9e4066Sahrens refcount_create(&db->db_holds); 69fa9e4066Sahrens return (0); 70fa9e4066Sahrens } 71fa9e4066Sahrens 72fa9e4066Sahrens /* ARGSUSED */ 73fa9e4066Sahrens static void 74fa9e4066Sahrens dbuf_dest(void *vdb, void *unused) 75fa9e4066Sahrens { 76fa9e4066Sahrens dmu_buf_impl_t *db = vdb; 77fa9e4066Sahrens mutex_destroy(&db->db_mtx); 78fa9e4066Sahrens cv_destroy(&db->db_changed); 79fa9e4066Sahrens refcount_destroy(&db->db_holds); 80fa9e4066Sahrens } 81fa9e4066Sahrens 82fa9e4066Sahrens /* 83fa9e4066Sahrens * dbuf hash table routines 84fa9e4066Sahrens */ 85fa9e4066Sahrens static dbuf_hash_table_t dbuf_hash_table; 86fa9e4066Sahrens 87fa9e4066Sahrens static uint64_t dbuf_hash_count; 88fa9e4066Sahrens 89fa9e4066Sahrens static uint64_t 90fa9e4066Sahrens dbuf_hash(void *os, uint64_t obj, uint8_t lvl, uint64_t blkid) 91fa9e4066Sahrens { 92fa9e4066Sahrens uintptr_t osv = (uintptr_t)os; 93fa9e4066Sahrens uint64_t crc = -1ULL; 94fa9e4066Sahrens 95fa9e4066Sahrens ASSERT(zfs_crc64_table[128] == ZFS_CRC64_POLY); 96fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (lvl)) & 0xFF]; 97fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (osv >> 6)) & 0xFF]; 98fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (obj >> 0)) & 0xFF]; 99fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (obj >> 8)) & 0xFF]; 100fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (blkid >> 0)) & 0xFF]; 101fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (blkid >> 8)) & 0xFF]; 102fa9e4066Sahrens 103fa9e4066Sahrens crc ^= (osv>>14) ^ (obj>>16) ^ (blkid>>16); 104fa9e4066Sahrens 105fa9e4066Sahrens return (crc); 106fa9e4066Sahrens } 107fa9e4066Sahrens 108fa9e4066Sahrens #define DBUF_HASH(os, obj, level, blkid) dbuf_hash(os, obj, level, blkid); 109fa9e4066Sahrens 110fa9e4066Sahrens #define DBUF_EQUAL(dbuf, os, obj, level, blkid) \ 111fa9e4066Sahrens ((dbuf)->db.db_object == (obj) && \ 112fa9e4066Sahrens (dbuf)->db_objset == (os) && \ 113fa9e4066Sahrens (dbuf)->db_level == (level) && \ 114fa9e4066Sahrens (dbuf)->db_blkid == (blkid)) 115fa9e4066Sahrens 116fa9e4066Sahrens dmu_buf_impl_t * 117fa9e4066Sahrens dbuf_find(dnode_t *dn, uint8_t level, uint64_t blkid) 118fa9e4066Sahrens { 119fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 120503ad85cSMatthew Ahrens objset_t *os = dn->dn_objset; 121fa9e4066Sahrens uint64_t obj = dn->dn_object; 122fa9e4066Sahrens uint64_t hv = DBUF_HASH(os, obj, level, blkid); 123fa9e4066Sahrens uint64_t idx = hv & h->hash_table_mask; 124fa9e4066Sahrens dmu_buf_impl_t *db; 125fa9e4066Sahrens 126fa9e4066Sahrens mutex_enter(DBUF_HASH_MUTEX(h, idx)); 127fa9e4066Sahrens for (db = h->hash_table[idx]; db != NULL; db = db->db_hash_next) { 128fa9e4066Sahrens if (DBUF_EQUAL(db, os, obj, level, blkid)) { 129fa9e4066Sahrens mutex_enter(&db->db_mtx); 130ea8dc4b6Seschrock if (db->db_state != DB_EVICTING) { 131fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 132fa9e4066Sahrens return (db); 133fa9e4066Sahrens } 134fa9e4066Sahrens mutex_exit(&db->db_mtx); 135fa9e4066Sahrens } 136fa9e4066Sahrens } 137fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 138fa9e4066Sahrens return (NULL); 139fa9e4066Sahrens } 140fa9e4066Sahrens 141fa9e4066Sahrens /* 142fa9e4066Sahrens * Insert an entry into the hash table. If there is already an element 143fa9e4066Sahrens * equal to elem in the hash table, then the already existing element 144fa9e4066Sahrens * will be returned and the new element will not be inserted. 145fa9e4066Sahrens * Otherwise returns NULL. 146fa9e4066Sahrens */ 147fa9e4066Sahrens static dmu_buf_impl_t * 148fa9e4066Sahrens dbuf_hash_insert(dmu_buf_impl_t *db) 149fa9e4066Sahrens { 150fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 151503ad85cSMatthew Ahrens objset_t *os = db->db_objset; 152fa9e4066Sahrens uint64_t obj = db->db.db_object; 153fa9e4066Sahrens int level = db->db_level; 154fa9e4066Sahrens uint64_t blkid = db->db_blkid; 155fa9e4066Sahrens uint64_t hv = DBUF_HASH(os, obj, level, blkid); 156fa9e4066Sahrens uint64_t idx = hv & h->hash_table_mask; 157fa9e4066Sahrens dmu_buf_impl_t *dbf; 158fa9e4066Sahrens 159fa9e4066Sahrens mutex_enter(DBUF_HASH_MUTEX(h, idx)); 160fa9e4066Sahrens for (dbf = h->hash_table[idx]; dbf != NULL; dbf = dbf->db_hash_next) { 161fa9e4066Sahrens if (DBUF_EQUAL(dbf, os, obj, level, blkid)) { 162fa9e4066Sahrens mutex_enter(&dbf->db_mtx); 163ea8dc4b6Seschrock if (dbf->db_state != DB_EVICTING) { 164fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 165fa9e4066Sahrens return (dbf); 166fa9e4066Sahrens } 167fa9e4066Sahrens mutex_exit(&dbf->db_mtx); 168fa9e4066Sahrens } 169fa9e4066Sahrens } 170fa9e4066Sahrens 171fa9e4066Sahrens mutex_enter(&db->db_mtx); 172fa9e4066Sahrens db->db_hash_next = h->hash_table[idx]; 173fa9e4066Sahrens h->hash_table[idx] = db; 174fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 175fa9e4066Sahrens atomic_add_64(&dbuf_hash_count, 1); 176fa9e4066Sahrens 177fa9e4066Sahrens return (NULL); 178fa9e4066Sahrens } 179fa9e4066Sahrens 180fa9e4066Sahrens /* 181fa9e4066Sahrens * Remove an entry from the hash table. This operation will 182fa9e4066Sahrens * fail if there are any existing holds on the db. 183fa9e4066Sahrens */ 184fa9e4066Sahrens static void 185fa9e4066Sahrens dbuf_hash_remove(dmu_buf_impl_t *db) 186fa9e4066Sahrens { 187fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 188fa9e4066Sahrens uint64_t hv = DBUF_HASH(db->db_objset, db->db.db_object, 189fa9e4066Sahrens db->db_level, db->db_blkid); 190fa9e4066Sahrens uint64_t idx = hv & h->hash_table_mask; 191fa9e4066Sahrens dmu_buf_impl_t *dbf, **dbp; 192fa9e4066Sahrens 193fa9e4066Sahrens /* 194fa9e4066Sahrens * We musn't hold db_mtx to maintin lock ordering: 195fa9e4066Sahrens * DBUF_HASH_MUTEX > db_mtx. 196fa9e4066Sahrens */ 197fa9e4066Sahrens ASSERT(refcount_is_zero(&db->db_holds)); 198ea8dc4b6Seschrock ASSERT(db->db_state == DB_EVICTING); 199fa9e4066Sahrens ASSERT(!MUTEX_HELD(&db->db_mtx)); 200fa9e4066Sahrens 201fa9e4066Sahrens mutex_enter(DBUF_HASH_MUTEX(h, idx)); 202fa9e4066Sahrens dbp = &h->hash_table[idx]; 203fa9e4066Sahrens while ((dbf = *dbp) != db) { 204fa9e4066Sahrens dbp = &dbf->db_hash_next; 205fa9e4066Sahrens ASSERT(dbf != NULL); 206fa9e4066Sahrens } 207fa9e4066Sahrens *dbp = db->db_hash_next; 208fa9e4066Sahrens db->db_hash_next = NULL; 209fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 210fa9e4066Sahrens atomic_add_64(&dbuf_hash_count, -1); 211fa9e4066Sahrens } 212fa9e4066Sahrens 213ea8dc4b6Seschrock static arc_evict_func_t dbuf_do_evict; 214fa9e4066Sahrens 215fa9e4066Sahrens static void 216fa9e4066Sahrens dbuf_evict_user(dmu_buf_impl_t *db) 217fa9e4066Sahrens { 218fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 219fa9e4066Sahrens 220c717a561Smaybee if (db->db_level != 0 || db->db_evict_func == NULL) 221fa9e4066Sahrens return; 222fa9e4066Sahrens 223c717a561Smaybee if (db->db_user_data_ptr_ptr) 224c717a561Smaybee *db->db_user_data_ptr_ptr = db->db.db_data; 225c717a561Smaybee db->db_evict_func(&db->db, db->db_user_ptr); 226c717a561Smaybee db->db_user_ptr = NULL; 227c717a561Smaybee db->db_user_data_ptr_ptr = NULL; 228c717a561Smaybee db->db_evict_func = NULL; 229fa9e4066Sahrens } 230fa9e4066Sahrens 231744947dcSTom Erickson boolean_t 232744947dcSTom Erickson dbuf_is_metadata(dmu_buf_impl_t *db) 233744947dcSTom Erickson { 234744947dcSTom Erickson if (db->db_level > 0) { 235744947dcSTom Erickson return (B_TRUE); 236744947dcSTom Erickson } else { 237744947dcSTom Erickson boolean_t is_metadata; 238744947dcSTom Erickson 239744947dcSTom Erickson DB_DNODE_ENTER(db); 240ad135b5dSChristopher Siden is_metadata = DMU_OT_IS_METADATA(DB_DNODE(db)->dn_type); 241744947dcSTom Erickson DB_DNODE_EXIT(db); 242744947dcSTom Erickson 243744947dcSTom Erickson return (is_metadata); 244744947dcSTom Erickson } 245744947dcSTom Erickson } 246744947dcSTom Erickson 247fa9e4066Sahrens void 248ea8dc4b6Seschrock dbuf_evict(dmu_buf_impl_t *db) 249ea8dc4b6Seschrock { 250ea8dc4b6Seschrock ASSERT(MUTEX_HELD(&db->db_mtx)); 251ea8dc4b6Seschrock ASSERT(db->db_buf == NULL); 252c717a561Smaybee ASSERT(db->db_data_pending == NULL); 253ea8dc4b6Seschrock 254ea8dc4b6Seschrock dbuf_clear(db); 255ea8dc4b6Seschrock dbuf_destroy(db); 256ea8dc4b6Seschrock } 257ea8dc4b6Seschrock 258ea8dc4b6Seschrock void 259fa9e4066Sahrens dbuf_init(void) 260fa9e4066Sahrens { 261ea8dc4b6Seschrock uint64_t hsize = 1ULL << 16; 262fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 263fa9e4066Sahrens int i; 264fa9e4066Sahrens 265fa9e4066Sahrens /* 266fa9e4066Sahrens * The hash table is big enough to fill all of physical memory 267ea8dc4b6Seschrock * with an average 4K block size. The table will take up 268ea8dc4b6Seschrock * totalmem*sizeof(void*)/4K (i.e. 2MB/GB with 8-byte pointers). 269fa9e4066Sahrens */ 270ea8dc4b6Seschrock while (hsize * 4096 < physmem * PAGESIZE) 271fa9e4066Sahrens hsize <<= 1; 272fa9e4066Sahrens 273ea8dc4b6Seschrock retry: 274fa9e4066Sahrens h->hash_table_mask = hsize - 1; 275ea8dc4b6Seschrock h->hash_table = kmem_zalloc(hsize * sizeof (void *), KM_NOSLEEP); 276ea8dc4b6Seschrock if (h->hash_table == NULL) { 277ea8dc4b6Seschrock /* XXX - we should really return an error instead of assert */ 278ea8dc4b6Seschrock ASSERT(hsize > (1ULL << 10)); 279ea8dc4b6Seschrock hsize >>= 1; 280ea8dc4b6Seschrock goto retry; 281ea8dc4b6Seschrock } 282fa9e4066Sahrens 283fa9e4066Sahrens dbuf_cache = kmem_cache_create("dmu_buf_impl_t", 284fa9e4066Sahrens sizeof (dmu_buf_impl_t), 285fa9e4066Sahrens 0, dbuf_cons, dbuf_dest, NULL, NULL, NULL, 0); 286fa9e4066Sahrens 287fa9e4066Sahrens for (i = 0; i < DBUF_MUTEXES; i++) 288fa9e4066Sahrens mutex_init(&h->hash_mutexes[i], NULL, MUTEX_DEFAULT, NULL); 289fa9e4066Sahrens } 290fa9e4066Sahrens 291fa9e4066Sahrens void 292fa9e4066Sahrens dbuf_fini(void) 293fa9e4066Sahrens { 294fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 295fa9e4066Sahrens int i; 296fa9e4066Sahrens 297fa9e4066Sahrens for (i = 0; i < DBUF_MUTEXES; i++) 298fa9e4066Sahrens mutex_destroy(&h->hash_mutexes[i]); 299fa9e4066Sahrens kmem_free(h->hash_table, (h->hash_table_mask + 1) * sizeof (void *)); 300fa9e4066Sahrens kmem_cache_destroy(dbuf_cache); 301fa9e4066Sahrens } 302fa9e4066Sahrens 303fa9e4066Sahrens /* 304fa9e4066Sahrens * Other stuff. 305fa9e4066Sahrens */ 306fa9e4066Sahrens 3079c9dc39aSek110237 #ifdef ZFS_DEBUG 308fa9e4066Sahrens static void 309fa9e4066Sahrens dbuf_verify(dmu_buf_impl_t *db) 310fa9e4066Sahrens { 311744947dcSTom Erickson dnode_t *dn; 312b24ab676SJeff Bonwick dbuf_dirty_record_t *dr; 313fa9e4066Sahrens 314fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 315fa9e4066Sahrens 316fa9e4066Sahrens if (!(zfs_flags & ZFS_DEBUG_DBUF_VERIFY)) 317fa9e4066Sahrens return; 318fa9e4066Sahrens 319fa9e4066Sahrens ASSERT(db->db_objset != NULL); 320744947dcSTom Erickson DB_DNODE_ENTER(db); 321744947dcSTom Erickson dn = DB_DNODE(db); 322fa9e4066Sahrens if (dn == NULL) { 323fa9e4066Sahrens ASSERT(db->db_parent == NULL); 324fa9e4066Sahrens ASSERT(db->db_blkptr == NULL); 325fa9e4066Sahrens } else { 326fa9e4066Sahrens ASSERT3U(db->db.db_object, ==, dn->dn_object); 327fa9e4066Sahrens ASSERT3P(db->db_objset, ==, dn->dn_objset); 328fa9e4066Sahrens ASSERT3U(db->db_level, <, dn->dn_nlevels); 329744947dcSTom Erickson ASSERT(db->db_blkid == DMU_BONUS_BLKID || 330744947dcSTom Erickson db->db_blkid == DMU_SPILL_BLKID || 331744947dcSTom Erickson !list_is_empty(&dn->dn_dbufs)); 332fa9e4066Sahrens } 3330a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 334fa9e4066Sahrens ASSERT(dn != NULL); 3351934e92fSmaybee ASSERT3U(db->db.db_size, >=, dn->dn_bonuslen); 3360a586ceaSMark Shellenbaum ASSERT3U(db->db.db_offset, ==, DMU_BONUS_BLKID); 3370a586ceaSMark Shellenbaum } else if (db->db_blkid == DMU_SPILL_BLKID) { 3380a586ceaSMark Shellenbaum ASSERT(dn != NULL); 3390a586ceaSMark Shellenbaum ASSERT3U(db->db.db_size, >=, dn->dn_bonuslen); 340fb09f5aaSMadhav Suresh ASSERT0(db->db.db_offset); 341fa9e4066Sahrens } else { 342fa9e4066Sahrens ASSERT3U(db->db.db_offset, ==, db->db_blkid * db->db.db_size); 343fa9e4066Sahrens } 344fa9e4066Sahrens 345b24ab676SJeff Bonwick for (dr = db->db_data_pending; dr != NULL; dr = dr->dr_next) 346b24ab676SJeff Bonwick ASSERT(dr->dr_dbuf == db); 347b24ab676SJeff Bonwick 348b24ab676SJeff Bonwick for (dr = db->db_last_dirty; dr != NULL; dr = dr->dr_next) 349b24ab676SJeff Bonwick ASSERT(dr->dr_dbuf == db); 350b24ab676SJeff Bonwick 35188b7b0f2SMatthew Ahrens /* 35288b7b0f2SMatthew Ahrens * We can't assert that db_size matches dn_datablksz because it 35388b7b0f2SMatthew Ahrens * can be momentarily different when another thread is doing 35488b7b0f2SMatthew Ahrens * dnode_set_blksz(). 35588b7b0f2SMatthew Ahrens */ 35688b7b0f2SMatthew Ahrens if (db->db_level == 0 && db->db.db_object == DMU_META_DNODE_OBJECT) { 357b24ab676SJeff Bonwick dr = db->db_data_pending; 358fa9e4066Sahrens /* 35988b7b0f2SMatthew Ahrens * It should only be modified in syncing context, so 36088b7b0f2SMatthew Ahrens * make sure we only have one copy of the data. 361fa9e4066Sahrens */ 362c717a561Smaybee ASSERT(dr == NULL || dr->dt.dl.dr_data == db->db_buf); 363fa9e4066Sahrens } 364fa9e4066Sahrens 365fa9e4066Sahrens /* verify db->db_blkptr */ 366fa9e4066Sahrens if (db->db_blkptr) { 367fa9e4066Sahrens if (db->db_parent == dn->dn_dbuf) { 368fa9e4066Sahrens /* db is pointed to by the dnode */ 369fa9e4066Sahrens /* ASSERT3U(db->db_blkid, <, dn->dn_nblkptr); */ 37014843421SMatthew Ahrens if (DMU_OBJECT_IS_SPECIAL(db->db.db_object)) 371fa9e4066Sahrens ASSERT(db->db_parent == NULL); 372fa9e4066Sahrens else 373fa9e4066Sahrens ASSERT(db->db_parent != NULL); 3740a586ceaSMark Shellenbaum if (db->db_blkid != DMU_SPILL_BLKID) 375fa9e4066Sahrens ASSERT3P(db->db_blkptr, ==, 376fa9e4066Sahrens &dn->dn_phys->dn_blkptr[db->db_blkid]); 377fa9e4066Sahrens } else { 378fa9e4066Sahrens /* db is pointed to by an indirect block */ 379fa9e4066Sahrens int epb = db->db_parent->db.db_size >> SPA_BLKPTRSHIFT; 380fa9e4066Sahrens ASSERT3U(db->db_parent->db_level, ==, db->db_level+1); 381fa9e4066Sahrens ASSERT3U(db->db_parent->db.db_object, ==, 382fa9e4066Sahrens db->db.db_object); 383fa9e4066Sahrens /* 384fa9e4066Sahrens * dnode_grow_indblksz() can make this fail if we don't 385fa9e4066Sahrens * have the struct_rwlock. XXX indblksz no longer 386fa9e4066Sahrens * grows. safe to do this now? 387fa9e4066Sahrens */ 388744947dcSTom Erickson if (RW_WRITE_HELD(&dn->dn_struct_rwlock)) { 389fa9e4066Sahrens ASSERT3P(db->db_blkptr, ==, 390fa9e4066Sahrens ((blkptr_t *)db->db_parent->db.db_data + 391fa9e4066Sahrens db->db_blkid % epb)); 392fa9e4066Sahrens } 393fa9e4066Sahrens } 394fa9e4066Sahrens } 395fa9e4066Sahrens if ((db->db_blkptr == NULL || BP_IS_HOLE(db->db_blkptr)) && 3963f9d6ad7SLin Ling (db->db_buf == NULL || db->db_buf->b_data) && 3970a586ceaSMark Shellenbaum db->db.db_data && db->db_blkid != DMU_BONUS_BLKID && 398fa9e4066Sahrens db->db_state != DB_FILL && !dn->dn_free_txg) { 399fa9e4066Sahrens /* 400fa9e4066Sahrens * If the blkptr isn't set but they have nonzero data, 401fa9e4066Sahrens * it had better be dirty, otherwise we'll lose that 402fa9e4066Sahrens * data when we evict this buffer. 403fa9e4066Sahrens */ 404fa9e4066Sahrens if (db->db_dirtycnt == 0) { 405fa9e4066Sahrens uint64_t *buf = db->db.db_data; 406fa9e4066Sahrens int i; 407fa9e4066Sahrens 408fa9e4066Sahrens for (i = 0; i < db->db.db_size >> 3; i++) { 409fa9e4066Sahrens ASSERT(buf[i] == 0); 410fa9e4066Sahrens } 411fa9e4066Sahrens } 412fa9e4066Sahrens } 413744947dcSTom Erickson DB_DNODE_EXIT(db); 414fa9e4066Sahrens } 4159c9dc39aSek110237 #endif 416fa9e4066Sahrens 417fa9e4066Sahrens static void 418fa9e4066Sahrens dbuf_update_data(dmu_buf_impl_t *db) 419fa9e4066Sahrens { 420fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 421c717a561Smaybee if (db->db_level == 0 && db->db_user_data_ptr_ptr) { 422fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 423c717a561Smaybee *db->db_user_data_ptr_ptr = db->db.db_data; 424fa9e4066Sahrens } 425fa9e4066Sahrens } 426fa9e4066Sahrens 427fa9e4066Sahrens static void 428fa9e4066Sahrens dbuf_set_data(dmu_buf_impl_t *db, arc_buf_t *buf) 429fa9e4066Sahrens { 430fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 431ea8dc4b6Seschrock ASSERT(db->db_buf == NULL || !arc_has_callback(db->db_buf)); 432fa9e4066Sahrens db->db_buf = buf; 433ea8dc4b6Seschrock if (buf != NULL) { 434ea8dc4b6Seschrock ASSERT(buf->b_data != NULL); 435fa9e4066Sahrens db->db.db_data = buf->b_data; 436ea8dc4b6Seschrock if (!arc_released(buf)) 437ea8dc4b6Seschrock arc_set_callback(buf, dbuf_do_evict, db); 438fa9e4066Sahrens dbuf_update_data(db); 439ea8dc4b6Seschrock } else { 440ea8dc4b6Seschrock dbuf_evict_user(db); 441ea8dc4b6Seschrock db->db.db_data = NULL; 44282c9918fSTim Haley if (db->db_state != DB_NOFILL) 443ea8dc4b6Seschrock db->db_state = DB_UNCACHED; 444ea8dc4b6Seschrock } 445fa9e4066Sahrens } 446fa9e4066Sahrens 447c242f9a0Schunli zhang - Sun Microsystems - Irvine United States /* 448c242f9a0Schunli zhang - Sun Microsystems - Irvine United States * Loan out an arc_buf for read. Return the loaned arc_buf. 449c242f9a0Schunli zhang - Sun Microsystems - Irvine United States */ 450c242f9a0Schunli zhang - Sun Microsystems - Irvine United States arc_buf_t * 451c242f9a0Schunli zhang - Sun Microsystems - Irvine United States dbuf_loan_arcbuf(dmu_buf_impl_t *db) 452c242f9a0Schunli zhang - Sun Microsystems - Irvine United States { 453c242f9a0Schunli zhang - Sun Microsystems - Irvine United States arc_buf_t *abuf; 454c242f9a0Schunli zhang - Sun Microsystems - Irvine United States 455c242f9a0Schunli zhang - Sun Microsystems - Irvine United States mutex_enter(&db->db_mtx); 456c242f9a0Schunli zhang - Sun Microsystems - Irvine United States if (arc_released(db->db_buf) || refcount_count(&db->db_holds) > 1) { 457c242f9a0Schunli zhang - Sun Microsystems - Irvine United States int blksz = db->db.db_size; 458744947dcSTom Erickson spa_t *spa; 459744947dcSTom Erickson 460c242f9a0Schunli zhang - Sun Microsystems - Irvine United States mutex_exit(&db->db_mtx); 461744947dcSTom Erickson DB_GET_SPA(&spa, db); 462744947dcSTom Erickson abuf = arc_loan_buf(spa, blksz); 463c242f9a0Schunli zhang - Sun Microsystems - Irvine United States bcopy(db->db.db_data, abuf->b_data, blksz); 464c242f9a0Schunli zhang - Sun Microsystems - Irvine United States } else { 465c242f9a0Schunli zhang - Sun Microsystems - Irvine United States abuf = db->db_buf; 466c242f9a0Schunli zhang - Sun Microsystems - Irvine United States arc_loan_inuse_buf(abuf, db); 467c242f9a0Schunli zhang - Sun Microsystems - Irvine United States dbuf_set_data(db, NULL); 468c242f9a0Schunli zhang - Sun Microsystems - Irvine United States mutex_exit(&db->db_mtx); 469c242f9a0Schunli zhang - Sun Microsystems - Irvine United States } 470c242f9a0Schunli zhang - Sun Microsystems - Irvine United States return (abuf); 471c242f9a0Schunli zhang - Sun Microsystems - Irvine United States } 472c242f9a0Schunli zhang - Sun Microsystems - Irvine United States 473fa9e4066Sahrens uint64_t 474fa9e4066Sahrens dbuf_whichblock(dnode_t *dn, uint64_t offset) 475fa9e4066Sahrens { 476fa9e4066Sahrens if (dn->dn_datablkshift) { 477fa9e4066Sahrens return (offset >> dn->dn_datablkshift); 478fa9e4066Sahrens } else { 479fa9e4066Sahrens ASSERT3U(offset, <, dn->dn_datablksz); 480fa9e4066Sahrens return (0); 481fa9e4066Sahrens } 482fa9e4066Sahrens } 483fa9e4066Sahrens 484fa9e4066Sahrens static void 485fa9e4066Sahrens dbuf_read_done(zio_t *zio, arc_buf_t *buf, void *vdb) 486fa9e4066Sahrens { 487fa9e4066Sahrens dmu_buf_impl_t *db = vdb; 488fa9e4066Sahrens 489fa9e4066Sahrens mutex_enter(&db->db_mtx); 490fa9e4066Sahrens ASSERT3U(db->db_state, ==, DB_READ); 491fa9e4066Sahrens /* 492fa9e4066Sahrens * All reads are synchronous, so we must have a hold on the dbuf 493fa9e4066Sahrens */ 494fa9e4066Sahrens ASSERT(refcount_count(&db->db_holds) > 0); 495ea8dc4b6Seschrock ASSERT(db->db_buf == NULL); 496fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 497c717a561Smaybee if (db->db_level == 0 && db->db_freed_in_flight) { 498fa9e4066Sahrens /* we were freed in flight; disregard any error */ 499fa9e4066Sahrens arc_release(buf, db); 500fa9e4066Sahrens bzero(buf->b_data, db->db.db_size); 5016b4acc8bSahrens arc_buf_freeze(buf); 502c717a561Smaybee db->db_freed_in_flight = FALSE; 503fa9e4066Sahrens dbuf_set_data(db, buf); 504fa9e4066Sahrens db->db_state = DB_CACHED; 505fa9e4066Sahrens } else if (zio == NULL || zio->io_error == 0) { 506fa9e4066Sahrens dbuf_set_data(db, buf); 507fa9e4066Sahrens db->db_state = DB_CACHED; 508fa9e4066Sahrens } else { 5090a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 510fa9e4066Sahrens ASSERT3P(db->db_buf, ==, NULL); 5113b2aab18SMatthew Ahrens VERIFY(arc_buf_remove_ref(buf, db)); 512ea8dc4b6Seschrock db->db_state = DB_UNCACHED; 513fa9e4066Sahrens } 514fa9e4066Sahrens cv_broadcast(&db->db_changed); 5153f9d6ad7SLin Ling dbuf_rele_and_unlock(db, NULL); 516fa9e4066Sahrens } 517fa9e4066Sahrens 518ea8dc4b6Seschrock static void 51913506d1eSmaybee dbuf_read_impl(dmu_buf_impl_t *db, zio_t *zio, uint32_t *flags) 520fa9e4066Sahrens { 521744947dcSTom Erickson dnode_t *dn; 522744947dcSTom Erickson spa_t *spa; 523ea8dc4b6Seschrock zbookmark_t zb; 52413506d1eSmaybee uint32_t aflags = ARC_NOWAIT; 525fa9e4066Sahrens 526744947dcSTom Erickson DB_DNODE_ENTER(db); 527744947dcSTom Erickson dn = DB_DNODE(db); 528fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 529fa9e4066Sahrens /* We need the struct_rwlock to prevent db_blkptr from changing. */ 530088f3894Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 531ea8dc4b6Seschrock ASSERT(MUTEX_HELD(&db->db_mtx)); 532ea8dc4b6Seschrock ASSERT(db->db_state == DB_UNCACHED); 533ea8dc4b6Seschrock ASSERT(db->db_buf == NULL); 534fa9e4066Sahrens 5350a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 536cf04dda1SMark Maybee int bonuslen = MIN(dn->dn_bonuslen, dn->dn_phys->dn_bonuslen); 5371934e92fSmaybee 5381934e92fSmaybee ASSERT3U(bonuslen, <=, db->db.db_size); 539ea8dc4b6Seschrock db->db.db_data = zio_buf_alloc(DN_MAX_BONUSLEN); 5405a98e54bSBrendan Gregg - Sun Microsystems arc_space_consume(DN_MAX_BONUSLEN, ARC_SPACE_OTHER); 5411934e92fSmaybee if (bonuslen < DN_MAX_BONUSLEN) 542ea8dc4b6Seschrock bzero(db->db.db_data, DN_MAX_BONUSLEN); 543cf04dda1SMark Maybee if (bonuslen) 544cf04dda1SMark Maybee bcopy(DN_BONUS(dn->dn_phys), db->db.db_data, bonuslen); 545744947dcSTom Erickson DB_DNODE_EXIT(db); 546ea8dc4b6Seschrock dbuf_update_data(db); 547fa9e4066Sahrens db->db_state = DB_CACHED; 548fa9e4066Sahrens mutex_exit(&db->db_mtx); 549fa9e4066Sahrens return; 550fa9e4066Sahrens } 551fa9e4066Sahrens 5521c8564a7SMark Maybee /* 5531c8564a7SMark Maybee * Recheck BP_IS_HOLE() after dnode_block_freed() in case dnode_sync() 5541c8564a7SMark Maybee * processes the delete record and clears the bp while we are waiting 5551c8564a7SMark Maybee * for the dn_mtx (resulting in a "no" from block_freed). 5561c8564a7SMark Maybee */ 557088f3894Sahrens if (db->db_blkptr == NULL || BP_IS_HOLE(db->db_blkptr) || 5581c8564a7SMark Maybee (db->db_level == 0 && (dnode_block_freed(dn, db->db_blkid) || 5591c8564a7SMark Maybee BP_IS_HOLE(db->db_blkptr)))) { 560ad23a2dbSjohansen arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 561ad23a2dbSjohansen 562088f3894Sahrens dbuf_set_data(db, arc_buf_alloc(dn->dn_objset->os_spa, 563ad23a2dbSjohansen db->db.db_size, db, type)); 564744947dcSTom Erickson DB_DNODE_EXIT(db); 565fa9e4066Sahrens bzero(db->db.db_data, db->db.db_size); 566fa9e4066Sahrens db->db_state = DB_CACHED; 56713506d1eSmaybee *flags |= DB_RF_CACHED; 568fa9e4066Sahrens mutex_exit(&db->db_mtx); 569fa9e4066Sahrens return; 570fa9e4066Sahrens } 571fa9e4066Sahrens 572744947dcSTom Erickson spa = dn->dn_objset->os_spa; 573744947dcSTom Erickson DB_DNODE_EXIT(db); 574744947dcSTom Erickson 575fa9e4066Sahrens db->db_state = DB_READ; 576fa9e4066Sahrens mutex_exit(&db->db_mtx); 577fa9e4066Sahrens 5783baa08fcSek110237 if (DBUF_IS_L2CACHEABLE(db)) 5793baa08fcSek110237 aflags |= ARC_L2CACHE; 580aad02571SSaso Kiselkov if (DBUF_IS_L2COMPRESSIBLE(db)) 581aad02571SSaso Kiselkov aflags |= ARC_L2COMPRESS; 5823baa08fcSek110237 583b24ab676SJeff Bonwick SET_BOOKMARK(&zb, db->db_objset->os_dsl_dataset ? 584b24ab676SJeff Bonwick db->db_objset->os_dsl_dataset->ds_object : DMU_META_OBJSET, 585b24ab676SJeff Bonwick db->db.db_object, db->db_level, db->db_blkid); 586ea8dc4b6Seschrock 587ea8dc4b6Seschrock dbuf_add_ref(db, NULL); 588088f3894Sahrens 5891b912ec7SGeorge Wilson (void) arc_read(zio, spa, db->db_blkptr, 590fa9e4066Sahrens dbuf_read_done, db, ZIO_PRIORITY_SYNC_READ, 59113506d1eSmaybee (*flags & DB_RF_CANFAIL) ? ZIO_FLAG_CANFAIL : ZIO_FLAG_MUSTSUCCEED, 59213506d1eSmaybee &aflags, &zb); 59313506d1eSmaybee if (aflags & ARC_CACHED) 59413506d1eSmaybee *flags |= DB_RF_CACHED; 595fa9e4066Sahrens } 596fa9e4066Sahrens 597ea8dc4b6Seschrock int 598ea8dc4b6Seschrock dbuf_read(dmu_buf_impl_t *db, zio_t *zio, uint32_t flags) 599fa9e4066Sahrens { 600ea8dc4b6Seschrock int err = 0; 601ea8dc4b6Seschrock int havepzio = (zio != NULL); 60213506d1eSmaybee int prefetch; 603744947dcSTom Erickson dnode_t *dn; 604fa9e4066Sahrens 605fa9e4066Sahrens /* 606fa9e4066Sahrens * We don't have to hold the mutex to check db_state because it 607fa9e4066Sahrens * can't be freed while we have a hold on the buffer. 608fa9e4066Sahrens */ 609fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 610fa9e4066Sahrens 61182c9918fSTim Haley if (db->db_state == DB_NOFILL) 612be6fd75aSMatthew Ahrens return (SET_ERROR(EIO)); 61382c9918fSTim Haley 614744947dcSTom Erickson DB_DNODE_ENTER(db); 615744947dcSTom Erickson dn = DB_DNODE(db); 616fa9e4066Sahrens if ((flags & DB_RF_HAVESTRUCT) == 0) 617744947dcSTom Erickson rw_enter(&dn->dn_struct_rwlock, RW_READER); 618fa9e4066Sahrens 6190a586ceaSMark Shellenbaum prefetch = db->db_level == 0 && db->db_blkid != DMU_BONUS_BLKID && 620744947dcSTom Erickson (flags & DB_RF_NOPREFETCH) == 0 && dn != NULL && 6213baa08fcSek110237 DBUF_IS_CACHEABLE(db); 62213506d1eSmaybee 623fa9e4066Sahrens mutex_enter(&db->db_mtx); 624ea8dc4b6Seschrock if (db->db_state == DB_CACHED) { 625ea8dc4b6Seschrock mutex_exit(&db->db_mtx); 62613506d1eSmaybee if (prefetch) 627744947dcSTom Erickson dmu_zfetch(&dn->dn_zfetch, db->db.db_offset, 62813506d1eSmaybee db->db.db_size, TRUE); 629ea8dc4b6Seschrock if ((flags & DB_RF_HAVESTRUCT) == 0) 630744947dcSTom Erickson rw_exit(&dn->dn_struct_rwlock); 631744947dcSTom Erickson DB_DNODE_EXIT(db); 632ea8dc4b6Seschrock } else if (db->db_state == DB_UNCACHED) { 633744947dcSTom Erickson spa_t *spa = dn->dn_objset->os_spa; 634744947dcSTom Erickson 635744947dcSTom Erickson if (zio == NULL) 636744947dcSTom Erickson zio = zio_root(spa, NULL, NULL, ZIO_FLAG_CANFAIL); 63713506d1eSmaybee dbuf_read_impl(db, zio, &flags); 63813506d1eSmaybee 639ea8dc4b6Seschrock /* dbuf_read_impl has dropped db_mtx for us */ 640ea8dc4b6Seschrock 64113506d1eSmaybee if (prefetch) 642744947dcSTom Erickson dmu_zfetch(&dn->dn_zfetch, db->db.db_offset, 64313506d1eSmaybee db->db.db_size, flags & DB_RF_CACHED); 644ea8dc4b6Seschrock 645ea8dc4b6Seschrock if ((flags & DB_RF_HAVESTRUCT) == 0) 646744947dcSTom Erickson rw_exit(&dn->dn_struct_rwlock); 647744947dcSTom Erickson DB_DNODE_EXIT(db); 648ea8dc4b6Seschrock 649ea8dc4b6Seschrock if (!havepzio) 650ea8dc4b6Seschrock err = zio_wait(zio); 651ea8dc4b6Seschrock } else { 6523e30c24aSWill Andrews /* 6533e30c24aSWill Andrews * Another reader came in while the dbuf was in flight 6543e30c24aSWill Andrews * between UNCACHED and CACHED. Either a writer will finish 6553e30c24aSWill Andrews * writing the buffer (sending the dbuf to CACHED) or the 6563e30c24aSWill Andrews * first reader's request will reach the read_done callback 6573e30c24aSWill Andrews * and send the dbuf to CACHED. Otherwise, a failure 6583e30c24aSWill Andrews * occurred and the dbuf went to UNCACHED. 6593e30c24aSWill Andrews */ 66013506d1eSmaybee mutex_exit(&db->db_mtx); 66113506d1eSmaybee if (prefetch) 662744947dcSTom Erickson dmu_zfetch(&dn->dn_zfetch, db->db.db_offset, 66313506d1eSmaybee db->db.db_size, TRUE); 664ea8dc4b6Seschrock if ((flags & DB_RF_HAVESTRUCT) == 0) 665744947dcSTom Erickson rw_exit(&dn->dn_struct_rwlock); 666744947dcSTom Erickson DB_DNODE_EXIT(db); 66713506d1eSmaybee 6683e30c24aSWill Andrews /* Skip the wait per the caller's request. */ 66913506d1eSmaybee mutex_enter(&db->db_mtx); 670ea8dc4b6Seschrock if ((flags & DB_RF_NEVERWAIT) == 0) { 671ea8dc4b6Seschrock while (db->db_state == DB_READ || 672ea8dc4b6Seschrock db->db_state == DB_FILL) { 673fa9e4066Sahrens ASSERT(db->db_state == DB_READ || 674fa9e4066Sahrens (flags & DB_RF_HAVESTRUCT) == 0); 675fa9e4066Sahrens cv_wait(&db->db_changed, &db->db_mtx); 676fa9e4066Sahrens } 677ea8dc4b6Seschrock if (db->db_state == DB_UNCACHED) 678be6fd75aSMatthew Ahrens err = SET_ERROR(EIO); 679ea8dc4b6Seschrock } 680fa9e4066Sahrens mutex_exit(&db->db_mtx); 681fa9e4066Sahrens } 682fa9e4066Sahrens 683ea8dc4b6Seschrock ASSERT(err || havepzio || db->db_state == DB_CACHED); 684ea8dc4b6Seschrock return (err); 685fa9e4066Sahrens } 686fa9e4066Sahrens 687fa9e4066Sahrens static void 688fa9e4066Sahrens dbuf_noread(dmu_buf_impl_t *db) 689fa9e4066Sahrens { 690fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 6910a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 692fa9e4066Sahrens mutex_enter(&db->db_mtx); 693fa9e4066Sahrens while (db->db_state == DB_READ || db->db_state == DB_FILL) 694fa9e4066Sahrens cv_wait(&db->db_changed, &db->db_mtx); 695fa9e4066Sahrens if (db->db_state == DB_UNCACHED) { 696ad23a2dbSjohansen arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 697744947dcSTom Erickson spa_t *spa; 698ad23a2dbSjohansen 699ea8dc4b6Seschrock ASSERT(db->db_buf == NULL); 700fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 701744947dcSTom Erickson DB_GET_SPA(&spa, db); 702744947dcSTom Erickson dbuf_set_data(db, arc_buf_alloc(spa, db->db.db_size, db, type)); 703fa9e4066Sahrens db->db_state = DB_FILL; 70482c9918fSTim Haley } else if (db->db_state == DB_NOFILL) { 70582c9918fSTim Haley dbuf_set_data(db, NULL); 706fa9e4066Sahrens } else { 707fa9e4066Sahrens ASSERT3U(db->db_state, ==, DB_CACHED); 708fa9e4066Sahrens } 709fa9e4066Sahrens mutex_exit(&db->db_mtx); 710fa9e4066Sahrens } 711fa9e4066Sahrens 712fa9e4066Sahrens /* 713fa9e4066Sahrens * This is our just-in-time copy function. It makes a copy of 714fa9e4066Sahrens * buffers, that have been modified in a previous transaction 715fa9e4066Sahrens * group, before we modify them in the current active group. 716fa9e4066Sahrens * 717fa9e4066Sahrens * This function is used in two places: when we are dirtying a 718fa9e4066Sahrens * buffer for the first time in a txg, and when we are freeing 719fa9e4066Sahrens * a range in a dnode that includes this buffer. 720fa9e4066Sahrens * 721fa9e4066Sahrens * Note that when we are called from dbuf_free_range() we do 722fa9e4066Sahrens * not put a hold on the buffer, we just traverse the active 723fa9e4066Sahrens * dbuf list for the dnode. 724fa9e4066Sahrens */ 725fa9e4066Sahrens static void 726fa9e4066Sahrens dbuf_fix_old_data(dmu_buf_impl_t *db, uint64_t txg) 727fa9e4066Sahrens { 728c717a561Smaybee dbuf_dirty_record_t *dr = db->db_last_dirty; 729fa9e4066Sahrens 730fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 731fa9e4066Sahrens ASSERT(db->db.db_data != NULL); 732c717a561Smaybee ASSERT(db->db_level == 0); 733c717a561Smaybee ASSERT(db->db.db_object != DMU_META_DNODE_OBJECT); 734fa9e4066Sahrens 7354d31c452Smaybee if (dr == NULL || 7364d31c452Smaybee (dr->dt.dl.dr_data != 7370a586ceaSMark Shellenbaum ((db->db_blkid == DMU_BONUS_BLKID) ? db->db.db_data : db->db_buf))) 738fa9e4066Sahrens return; 739fa9e4066Sahrens 740fa9e4066Sahrens /* 741c717a561Smaybee * If the last dirty record for this dbuf has not yet synced 742c717a561Smaybee * and its referencing the dbuf data, either: 743c717a561Smaybee * reset the reference to point to a new copy, 744c717a561Smaybee * or (if there a no active holders) 745c717a561Smaybee * just null out the current db_data pointer. 746fa9e4066Sahrens */ 747c717a561Smaybee ASSERT(dr->dr_txg >= txg - 2); 7480a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 749c717a561Smaybee /* Note that the data bufs here are zio_bufs */ 750c717a561Smaybee dr->dt.dl.dr_data = zio_buf_alloc(DN_MAX_BONUSLEN); 7515a98e54bSBrendan Gregg - Sun Microsystems arc_space_consume(DN_MAX_BONUSLEN, ARC_SPACE_OTHER); 752c717a561Smaybee bcopy(db->db.db_data, dr->dt.dl.dr_data, DN_MAX_BONUSLEN); 753c717a561Smaybee } else if (refcount_count(&db->db_holds) > db->db_dirtycnt) { 754ea8dc4b6Seschrock int size = db->db.db_size; 755c717a561Smaybee arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 756744947dcSTom Erickson spa_t *spa; 757744947dcSTom Erickson 758744947dcSTom Erickson DB_GET_SPA(&spa, db); 759744947dcSTom Erickson dr->dt.dl.dr_data = arc_buf_alloc(spa, size, db, type); 760c717a561Smaybee bcopy(db->db.db_data, dr->dt.dl.dr_data->b_data, size); 761fa9e4066Sahrens } else { 762ea8dc4b6Seschrock dbuf_set_data(db, NULL); 763fa9e4066Sahrens } 764fa9e4066Sahrens } 765ea8dc4b6Seschrock 766fa9e4066Sahrens void 767c717a561Smaybee dbuf_unoverride(dbuf_dirty_record_t *dr) 768fa9e4066Sahrens { 769c717a561Smaybee dmu_buf_impl_t *db = dr->dr_dbuf; 770b24ab676SJeff Bonwick blkptr_t *bp = &dr->dt.dl.dr_overridden_by; 771c717a561Smaybee uint64_t txg = dr->dr_txg; 772c5c6ffa0Smaybee 773c717a561Smaybee ASSERT(MUTEX_HELD(&db->db_mtx)); 774c717a561Smaybee ASSERT(dr->dt.dl.dr_override_state != DR_IN_DMU_SYNC); 775c717a561Smaybee ASSERT(db->db_level == 0); 776c717a561Smaybee 7770a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID || 778c717a561Smaybee dr->dt.dl.dr_override_state == DR_NOT_OVERRIDDEN) 779c717a561Smaybee return; 780c717a561Smaybee 781b24ab676SJeff Bonwick ASSERT(db->db_data_pending != dr); 782b24ab676SJeff Bonwick 783fa9e4066Sahrens /* free this block */ 78480901aeaSGeorge Wilson if (!BP_IS_HOLE(bp) && !dr->dt.dl.dr_nopwrite) { 785744947dcSTom Erickson spa_t *spa; 786b24ab676SJeff Bonwick 787744947dcSTom Erickson DB_GET_SPA(&spa, db); 788744947dcSTom Erickson zio_free(spa, txg, bp); 789744947dcSTom Erickson } 790c717a561Smaybee dr->dt.dl.dr_override_state = DR_NOT_OVERRIDDEN; 79180901aeaSGeorge Wilson dr->dt.dl.dr_nopwrite = B_FALSE; 79280901aeaSGeorge Wilson 7936b4acc8bSahrens /* 7946b4acc8bSahrens * Release the already-written buffer, so we leave it in 7956b4acc8bSahrens * a consistent dirty state. Note that all callers are 7966b4acc8bSahrens * modifying the buffer, so they will immediately do 7976b4acc8bSahrens * another (redundant) arc_release(). Therefore, leave 7986b4acc8bSahrens * the buf thawed to save the effort of freezing & 7996b4acc8bSahrens * immediately re-thawing it. 8006b4acc8bSahrens */ 801c717a561Smaybee arc_release(dr->dt.dl.dr_data, db); 802fa9e4066Sahrens } 803fa9e4066Sahrens 804cdb0ab79Smaybee /* 805cdb0ab79Smaybee * Evict (if its unreferenced) or clear (if its referenced) any level-0 806cdb0ab79Smaybee * data blocks in the free range, so that any future readers will find 8072f3d8780SMatthew Ahrens * empty blocks. Also, if we happen across any level-1 dbufs in the 808cdb0ab79Smaybee * range that have not already been marked dirty, mark them dirty so 809cdb0ab79Smaybee * they stay in memory. 8102f3d8780SMatthew Ahrens * 8112f3d8780SMatthew Ahrens * This is a no-op if the dataset is in the middle of an incremental 8122f3d8780SMatthew Ahrens * receive; see comment below for details. 813cdb0ab79Smaybee */ 814fa9e4066Sahrens void 815cdb0ab79Smaybee dbuf_free_range(dnode_t *dn, uint64_t start, uint64_t end, dmu_tx_t *tx) 816fa9e4066Sahrens { 817fa9e4066Sahrens dmu_buf_impl_t *db, *db_next; 818fa9e4066Sahrens uint64_t txg = tx->tx_txg; 819cdb0ab79Smaybee int epbs = dn->dn_indblkshift - SPA_BLKPTRSHIFT; 820cdb0ab79Smaybee uint64_t first_l1 = start >> epbs; 821cdb0ab79Smaybee uint64_t last_l1 = end >> epbs; 822fa9e4066Sahrens 8230a586ceaSMark Shellenbaum if (end > dn->dn_maxblkid && (end != DMU_SPILL_BLKID)) { 824cdb0ab79Smaybee end = dn->dn_maxblkid; 825cdb0ab79Smaybee last_l1 = end >> epbs; 826cdb0ab79Smaybee } 827cdb0ab79Smaybee dprintf_dnode(dn, "start=%llu end=%llu\n", start, end); 8282f3d8780SMatthew Ahrens 829713d6c20SMatthew Ahrens mutex_enter(&dn->dn_dbufs_mtx); 830713d6c20SMatthew Ahrens if (start >= dn->dn_unlisted_l0_blkid * dn->dn_datablksz) { 831713d6c20SMatthew Ahrens /* There can't be any dbufs in this range; no need to search. */ 832713d6c20SMatthew Ahrens mutex_exit(&dn->dn_dbufs_mtx); 8332f3d8780SMatthew Ahrens return; 834713d6c20SMatthew Ahrens } else if (dmu_objset_is_receiving(dn->dn_objset)) { 835713d6c20SMatthew Ahrens /* 836713d6c20SMatthew Ahrens * If we are receiving, we expect there to be no dbufs in 837713d6c20SMatthew Ahrens * the range to be freed, because receive modifies each 838713d6c20SMatthew Ahrens * block at most once, and in offset order. If this is 839713d6c20SMatthew Ahrens * not the case, it can lead to performance problems, 840713d6c20SMatthew Ahrens * so note that we unexpectedly took the slow path. 841713d6c20SMatthew Ahrens */ 842713d6c20SMatthew Ahrens atomic_inc_64(&zfs_free_range_recv_miss); 8432f3d8780SMatthew Ahrens } 8442f3d8780SMatthew Ahrens 845*69962b56SMatthew Ahrens for (db = list_head(&dn->dn_dbufs); db != NULL; db = db_next) { 846fa9e4066Sahrens db_next = list_next(&dn->dn_dbufs, db); 8470a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 848cdb0ab79Smaybee 849cdb0ab79Smaybee if (db->db_level == 1 && 850cdb0ab79Smaybee db->db_blkid >= first_l1 && db->db_blkid <= last_l1) { 851cdb0ab79Smaybee mutex_enter(&db->db_mtx); 852cdb0ab79Smaybee if (db->db_last_dirty && 853cdb0ab79Smaybee db->db_last_dirty->dr_txg < txg) { 854cdb0ab79Smaybee dbuf_add_ref(db, FTAG); 855cdb0ab79Smaybee mutex_exit(&db->db_mtx); 856cdb0ab79Smaybee dbuf_will_dirty(db, tx); 857cdb0ab79Smaybee dbuf_rele(db, FTAG); 858cdb0ab79Smaybee } else { 859cdb0ab79Smaybee mutex_exit(&db->db_mtx); 860cdb0ab79Smaybee } 861cdb0ab79Smaybee } 862cdb0ab79Smaybee 863ea8dc4b6Seschrock if (db->db_level != 0) 864fa9e4066Sahrens continue; 865fa9e4066Sahrens dprintf_dbuf(db, "found buf %s\n", ""); 866cdb0ab79Smaybee if (db->db_blkid < start || db->db_blkid > end) 867fa9e4066Sahrens continue; 868fa9e4066Sahrens 869fa9e4066Sahrens /* found a level 0 buffer in the range */ 870fa9e4066Sahrens mutex_enter(&db->db_mtx); 8713b2aab18SMatthew Ahrens if (dbuf_undirty(db, tx)) { 8723b2aab18SMatthew Ahrens /* mutex has been dropped and dbuf destroyed */ 8733b2aab18SMatthew Ahrens continue; 8743b2aab18SMatthew Ahrens } 8753b2aab18SMatthew Ahrens 876ea8dc4b6Seschrock if (db->db_state == DB_UNCACHED || 87782c9918fSTim Haley db->db_state == DB_NOFILL || 878ea8dc4b6Seschrock db->db_state == DB_EVICTING) { 879fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 880fa9e4066Sahrens mutex_exit(&db->db_mtx); 881fa9e4066Sahrens continue; 882fa9e4066Sahrens } 883c543ec06Sahrens if (db->db_state == DB_READ || db->db_state == DB_FILL) { 884c543ec06Sahrens /* will be handled in dbuf_read_done or dbuf_rele */ 885c717a561Smaybee db->db_freed_in_flight = TRUE; 886fa9e4066Sahrens mutex_exit(&db->db_mtx); 887fa9e4066Sahrens continue; 888fa9e4066Sahrens } 889ea8dc4b6Seschrock if (refcount_count(&db->db_holds) == 0) { 890ea8dc4b6Seschrock ASSERT(db->db_buf); 891ea8dc4b6Seschrock dbuf_clear(db); 892ea8dc4b6Seschrock continue; 893ea8dc4b6Seschrock } 894c717a561Smaybee /* The dbuf is referenced */ 895fa9e4066Sahrens 896c717a561Smaybee if (db->db_last_dirty != NULL) { 897c717a561Smaybee dbuf_dirty_record_t *dr = db->db_last_dirty; 898c717a561Smaybee 899c717a561Smaybee if (dr->dr_txg == txg) { 900ea8dc4b6Seschrock /* 901c717a561Smaybee * This buffer is "in-use", re-adjust the file 902c717a561Smaybee * size to reflect that this buffer may 903c717a561Smaybee * contain new data when we sync. 904ea8dc4b6Seschrock */ 90506e0070dSMark Shellenbaum if (db->db_blkid != DMU_SPILL_BLKID && 90606e0070dSMark Shellenbaum db->db_blkid > dn->dn_maxblkid) 90744eda4d7Smaybee dn->dn_maxblkid = db->db_blkid; 908c717a561Smaybee dbuf_unoverride(dr); 909c717a561Smaybee } else { 910c717a561Smaybee /* 911c717a561Smaybee * This dbuf is not dirty in the open context. 912c717a561Smaybee * Either uncache it (if its not referenced in 913c717a561Smaybee * the open context) or reset its contents to 914c717a561Smaybee * empty. 915c717a561Smaybee */ 916c717a561Smaybee dbuf_fix_old_data(db, txg); 91744eda4d7Smaybee } 918c717a561Smaybee } 919c717a561Smaybee /* clear the contents if its cached */ 920ea8dc4b6Seschrock if (db->db_state == DB_CACHED) { 921ea8dc4b6Seschrock ASSERT(db->db.db_data != NULL); 922fa9e4066Sahrens arc_release(db->db_buf, db); 923fa9e4066Sahrens bzero(db->db.db_data, db->db.db_size); 9246b4acc8bSahrens arc_buf_freeze(db->db_buf); 925fa9e4066Sahrens } 926ea8dc4b6Seschrock 927fa9e4066Sahrens mutex_exit(&db->db_mtx); 928fa9e4066Sahrens } 929fa9e4066Sahrens mutex_exit(&dn->dn_dbufs_mtx); 930fa9e4066Sahrens } 931fa9e4066Sahrens 932fa9e4066Sahrens static int 9331934e92fSmaybee dbuf_block_freeable(dmu_buf_impl_t *db) 934fa9e4066Sahrens { 935fa9e4066Sahrens dsl_dataset_t *ds = db->db_objset->os_dsl_dataset; 936fa9e4066Sahrens uint64_t birth_txg = 0; 937fa9e4066Sahrens 938fa9e4066Sahrens /* 939fa9e4066Sahrens * We don't need any locking to protect db_blkptr: 940c717a561Smaybee * If it's syncing, then db_last_dirty will be set 941c717a561Smaybee * so we'll ignore db_blkptr. 942fa9e4066Sahrens */ 943c717a561Smaybee ASSERT(MUTEX_HELD(&db->db_mtx)); 944c717a561Smaybee if (db->db_last_dirty) 945c717a561Smaybee birth_txg = db->db_last_dirty->dr_txg; 946fa9e4066Sahrens else if (db->db_blkptr) 947fa9e4066Sahrens birth_txg = db->db_blkptr->blk_birth; 948fa9e4066Sahrens 949837b568bSGeorge Wilson /* 950837b568bSGeorge Wilson * If we don't exist or are in a snapshot, we can't be freed. 951837b568bSGeorge Wilson * Don't pass the bp to dsl_dataset_block_freeable() since we 952837b568bSGeorge Wilson * are holding the db_mtx lock and might deadlock if we are 953837b568bSGeorge Wilson * prefetching a dedup-ed block. 954837b568bSGeorge Wilson */ 955fa9e4066Sahrens if (birth_txg) 9561934e92fSmaybee return (ds == NULL || 957837b568bSGeorge Wilson dsl_dataset_block_freeable(ds, NULL, birth_txg)); 958fa9e4066Sahrens else 9591934e92fSmaybee return (FALSE); 960fa9e4066Sahrens } 961fa9e4066Sahrens 962fa9e4066Sahrens void 963fa9e4066Sahrens dbuf_new_size(dmu_buf_impl_t *db, int size, dmu_tx_t *tx) 964fa9e4066Sahrens { 965fa9e4066Sahrens arc_buf_t *buf, *obuf; 966fa9e4066Sahrens int osize = db->db.db_size; 967ad23a2dbSjohansen arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 968744947dcSTom Erickson dnode_t *dn; 969fa9e4066Sahrens 9700a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 971ea8dc4b6Seschrock 972744947dcSTom Erickson DB_DNODE_ENTER(db); 973744947dcSTom Erickson dn = DB_DNODE(db); 974744947dcSTom Erickson 975fa9e4066Sahrens /* XXX does *this* func really need the lock? */ 976744947dcSTom Erickson ASSERT(RW_WRITE_HELD(&dn->dn_struct_rwlock)); 977fa9e4066Sahrens 978fa9e4066Sahrens /* 979fa9e4066Sahrens * This call to dbuf_will_dirty() with the dn_struct_rwlock held 980fa9e4066Sahrens * is OK, because there can be no other references to the db 981fa9e4066Sahrens * when we are changing its size, so no concurrent DB_FILL can 982fa9e4066Sahrens * be happening. 983fa9e4066Sahrens */ 984ea8dc4b6Seschrock /* 985ea8dc4b6Seschrock * XXX we should be doing a dbuf_read, checking the return 986ea8dc4b6Seschrock * value and returning that up to our callers 987ea8dc4b6Seschrock */ 988fa9e4066Sahrens dbuf_will_dirty(db, tx); 989fa9e4066Sahrens 990fa9e4066Sahrens /* create the data buffer for the new block */ 991744947dcSTom Erickson buf = arc_buf_alloc(dn->dn_objset->os_spa, size, db, type); 992fa9e4066Sahrens 993fa9e4066Sahrens /* copy old block data to the new block */ 994fa9e4066Sahrens obuf = db->db_buf; 995f65e61c0Sahrens bcopy(obuf->b_data, buf->b_data, MIN(osize, size)); 996fa9e4066Sahrens /* zero the remainder */ 997f65e61c0Sahrens if (size > osize) 998fa9e4066Sahrens bzero((uint8_t *)buf->b_data + osize, size - osize); 999fa9e4066Sahrens 1000fa9e4066Sahrens mutex_enter(&db->db_mtx); 1001fa9e4066Sahrens dbuf_set_data(db, buf); 10023b2aab18SMatthew Ahrens VERIFY(arc_buf_remove_ref(obuf, db)); 1003fa9e4066Sahrens db->db.db_size = size; 1004fa9e4066Sahrens 1005c717a561Smaybee if (db->db_level == 0) { 1006c717a561Smaybee ASSERT3U(db->db_last_dirty->dr_txg, ==, tx->tx_txg); 1007c717a561Smaybee db->db_last_dirty->dt.dl.dr_data = buf; 1008c717a561Smaybee } 1009fa9e4066Sahrens mutex_exit(&db->db_mtx); 1010fa9e4066Sahrens 1011744947dcSTom Erickson dnode_willuse_space(dn, size-osize, tx); 1012744947dcSTom Erickson DB_DNODE_EXIT(db); 1013fa9e4066Sahrens } 1014fa9e4066Sahrens 10153f9d6ad7SLin Ling void 10163f9d6ad7SLin Ling dbuf_release_bp(dmu_buf_impl_t *db) 10173f9d6ad7SLin Ling { 1018744947dcSTom Erickson objset_t *os; 10193f9d6ad7SLin Ling 1020744947dcSTom Erickson DB_GET_OBJSET(&os, db); 10213f9d6ad7SLin Ling ASSERT(dsl_pool_sync_context(dmu_objset_pool(os))); 10223f9d6ad7SLin Ling ASSERT(arc_released(os->os_phys_buf) || 10233f9d6ad7SLin Ling list_link_active(&os->os_dsl_dataset->ds_synced_link)); 10243f9d6ad7SLin Ling ASSERT(db->db_parent == NULL || arc_released(db->db_parent->db_buf)); 10253f9d6ad7SLin Ling 10261b912ec7SGeorge Wilson (void) arc_release(db->db_buf, db); 10273f9d6ad7SLin Ling } 10283f9d6ad7SLin Ling 1029c717a561Smaybee dbuf_dirty_record_t * 1030fa9e4066Sahrens dbuf_dirty(dmu_buf_impl_t *db, dmu_tx_t *tx) 1031fa9e4066Sahrens { 1032744947dcSTom Erickson dnode_t *dn; 1033744947dcSTom Erickson objset_t *os; 1034c717a561Smaybee dbuf_dirty_record_t **drp, *dr; 1035fa9e4066Sahrens int drop_struct_lock = FALSE; 1036d3469faaSMark Maybee boolean_t do_free_accounting = B_FALSE; 1037fa9e4066Sahrens int txgoff = tx->tx_txg & TXG_MASK; 1038fa9e4066Sahrens 1039fa9e4066Sahrens ASSERT(tx->tx_txg != 0); 1040fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 10419c9dc39aSek110237 DMU_TX_DIRTY_BUF(tx, db); 1042fa9e4066Sahrens 1043744947dcSTom Erickson DB_DNODE_ENTER(db); 1044744947dcSTom Erickson dn = DB_DNODE(db); 1045fa9e4066Sahrens /* 1046fa9e4066Sahrens * Shouldn't dirty a regular buffer in syncing context. Private 1047fa9e4066Sahrens * objects may be dirtied in syncing context, but only if they 1048fa9e4066Sahrens * were already pre-dirtied in open context. 1049fa9e4066Sahrens */ 1050c717a561Smaybee ASSERT(!dmu_tx_is_syncing(tx) || 1051c717a561Smaybee BP_IS_HOLE(dn->dn_objset->os_rootbp) || 105214843421SMatthew Ahrens DMU_OBJECT_IS_SPECIAL(dn->dn_object) || 105314843421SMatthew Ahrens dn->dn_objset->os_dsl_dataset == NULL); 1054fa9e4066Sahrens /* 1055fa9e4066Sahrens * We make this assert for private objects as well, but after we 1056fa9e4066Sahrens * check if we're already dirty. They are allowed to re-dirty 1057fa9e4066Sahrens * in syncing context. 1058fa9e4066Sahrens */ 1059ea8dc4b6Seschrock ASSERT(dn->dn_object == DMU_META_DNODE_OBJECT || 1060c717a561Smaybee dn->dn_dirtyctx == DN_UNDIRTIED || dn->dn_dirtyctx == 1061fa9e4066Sahrens (dmu_tx_is_syncing(tx) ? DN_DIRTY_SYNC : DN_DIRTY_OPEN)); 1062fa9e4066Sahrens 1063fa9e4066Sahrens mutex_enter(&db->db_mtx); 1064fa9e4066Sahrens /* 1065c717a561Smaybee * XXX make this true for indirects too? The problem is that 1066c717a561Smaybee * transactions created with dmu_tx_create_assigned() from 1067c717a561Smaybee * syncing context don't bother holding ahead. 1068fa9e4066Sahrens */ 1069c717a561Smaybee ASSERT(db->db_level != 0 || 107082c9918fSTim Haley db->db_state == DB_CACHED || db->db_state == DB_FILL || 107182c9918fSTim Haley db->db_state == DB_NOFILL); 1072fa9e4066Sahrens 1073fa9e4066Sahrens mutex_enter(&dn->dn_mtx); 1074fa9e4066Sahrens /* 1075fa9e4066Sahrens * Don't set dirtyctx to SYNC if we're just modifying this as we 1076fa9e4066Sahrens * initialize the objset. 1077fa9e4066Sahrens */ 1078fa9e4066Sahrens if (dn->dn_dirtyctx == DN_UNDIRTIED && 1079c717a561Smaybee !BP_IS_HOLE(dn->dn_objset->os_rootbp)) { 1080fa9e4066Sahrens dn->dn_dirtyctx = 1081fa9e4066Sahrens (dmu_tx_is_syncing(tx) ? DN_DIRTY_SYNC : DN_DIRTY_OPEN); 1082fa9e4066Sahrens ASSERT(dn->dn_dirtyctx_firstset == NULL); 1083fa9e4066Sahrens dn->dn_dirtyctx_firstset = kmem_alloc(1, KM_SLEEP); 1084fa9e4066Sahrens } 1085fa9e4066Sahrens mutex_exit(&dn->dn_mtx); 1086fa9e4066Sahrens 10870a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) 10880a586ceaSMark Shellenbaum dn->dn_have_spill = B_TRUE; 10890a586ceaSMark Shellenbaum 1090fa9e4066Sahrens /* 1091fa9e4066Sahrens * If this buffer is already dirty, we're done. 1092fa9e4066Sahrens */ 1093c717a561Smaybee drp = &db->db_last_dirty; 1094c717a561Smaybee ASSERT(*drp == NULL || (*drp)->dr_txg <= tx->tx_txg || 1095c717a561Smaybee db->db.db_object == DMU_META_DNODE_OBJECT); 10967e2186e3Sbonwick while ((dr = *drp) != NULL && dr->dr_txg > tx->tx_txg) 10977e2186e3Sbonwick drp = &dr->dr_next; 10987e2186e3Sbonwick if (dr && dr->dr_txg == tx->tx_txg) { 1099744947dcSTom Erickson DB_DNODE_EXIT(db); 1100744947dcSTom Erickson 11010a586ceaSMark Shellenbaum if (db->db_level == 0 && db->db_blkid != DMU_BONUS_BLKID) { 1102c717a561Smaybee /* 1103c717a561Smaybee * If this buffer has already been written out, 1104c717a561Smaybee * we now need to reset its state. 1105c717a561Smaybee */ 11067e2186e3Sbonwick dbuf_unoverride(dr); 1107b24ab676SJeff Bonwick if (db->db.db_object != DMU_META_DNODE_OBJECT && 1108b24ab676SJeff Bonwick db->db_state != DB_NOFILL) 11096b4acc8bSahrens arc_buf_thaw(db->db_buf); 1110c717a561Smaybee } 1111fa9e4066Sahrens mutex_exit(&db->db_mtx); 11127e2186e3Sbonwick return (dr); 1113fa9e4066Sahrens } 1114fa9e4066Sahrens 1115fa9e4066Sahrens /* 1116fa9e4066Sahrens * Only valid if not already dirty. 1117fa9e4066Sahrens */ 111814843421SMatthew Ahrens ASSERT(dn->dn_object == 0 || 111914843421SMatthew Ahrens dn->dn_dirtyctx == DN_UNDIRTIED || dn->dn_dirtyctx == 1120fa9e4066Sahrens (dmu_tx_is_syncing(tx) ? DN_DIRTY_SYNC : DN_DIRTY_OPEN)); 1121fa9e4066Sahrens 1122fa9e4066Sahrens ASSERT3U(dn->dn_nlevels, >, db->db_level); 1123fa9e4066Sahrens ASSERT((dn->dn_phys->dn_nlevels == 0 && db->db_level == 0) || 1124fa9e4066Sahrens dn->dn_phys->dn_nlevels > db->db_level || 1125fa9e4066Sahrens dn->dn_next_nlevels[txgoff] > db->db_level || 1126fa9e4066Sahrens dn->dn_next_nlevels[(tx->tx_txg-1) & TXG_MASK] > db->db_level || 1127fa9e4066Sahrens dn->dn_next_nlevels[(tx->tx_txg-2) & TXG_MASK] > db->db_level); 1128fa9e4066Sahrens 1129fa9e4066Sahrens /* 1130fa9e4066Sahrens * We should only be dirtying in syncing context if it's the 113114843421SMatthew Ahrens * mos or we're initializing the os or it's a special object. 113214843421SMatthew Ahrens * However, we are allowed to dirty in syncing context provided 113314843421SMatthew Ahrens * we already dirtied it in open context. Hence we must make 113414843421SMatthew Ahrens * this assertion only if we're not already dirty. 1135fa9e4066Sahrens */ 1136744947dcSTom Erickson os = dn->dn_objset; 113714843421SMatthew Ahrens ASSERT(!dmu_tx_is_syncing(tx) || DMU_OBJECT_IS_SPECIAL(dn->dn_object) || 113814843421SMatthew Ahrens os->os_dsl_dataset == NULL || BP_IS_HOLE(os->os_rootbp)); 1139fa9e4066Sahrens ASSERT(db->db.db_size != 0); 1140fa9e4066Sahrens 1141fa9e4066Sahrens dprintf_dbuf(db, "size=%llx\n", (u_longlong_t)db->db.db_size); 1142fa9e4066Sahrens 11430a586ceaSMark Shellenbaum if (db->db_blkid != DMU_BONUS_BLKID) { 11441934e92fSmaybee /* 11451934e92fSmaybee * Update the accounting. 1146d3469faaSMark Maybee * Note: we delay "free accounting" until after we drop 1147d3469faaSMark Maybee * the db_mtx. This keeps us from grabbing other locks 1148b24ab676SJeff Bonwick * (and possibly deadlocking) in bp_get_dsize() while 1149d3469faaSMark Maybee * also holding the db_mtx. 11501934e92fSmaybee */ 11511934e92fSmaybee dnode_willuse_space(dn, db->db.db_size, tx); 1152d3469faaSMark Maybee do_free_accounting = dbuf_block_freeable(db); 11531934e92fSmaybee } 11541934e92fSmaybee 1155ea8dc4b6Seschrock /* 1156ea8dc4b6Seschrock * If this buffer is dirty in an old transaction group we need 1157ea8dc4b6Seschrock * to make a copy of it so that the changes we make in this 1158ea8dc4b6Seschrock * transaction group won't leak out when we sync the older txg. 1159ea8dc4b6Seschrock */ 1160c717a561Smaybee dr = kmem_zalloc(sizeof (dbuf_dirty_record_t), KM_SLEEP); 1161c717a561Smaybee if (db->db_level == 0) { 1162c717a561Smaybee void *data_old = db->db_buf; 1163c717a561Smaybee 116482c9918fSTim Haley if (db->db_state != DB_NOFILL) { 11650a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 1166c717a561Smaybee dbuf_fix_old_data(db, tx->tx_txg); 1167c717a561Smaybee data_old = db->db.db_data; 1168c717a561Smaybee } else if (db->db.db_object != DMU_META_DNODE_OBJECT) { 1169fa9e4066Sahrens /* 117082c9918fSTim Haley * Release the data buffer from the cache so 117182c9918fSTim Haley * that we can modify it without impacting 117282c9918fSTim Haley * possible other users of this cached data 117382c9918fSTim Haley * block. Note that indirect blocks and 117482c9918fSTim Haley * private objects are not released until the 117582c9918fSTim Haley * syncing state (since they are only modified 117682c9918fSTim Haley * then). 1177fa9e4066Sahrens */ 1178fa9e4066Sahrens arc_release(db->db_buf, db); 1179fa9e4066Sahrens dbuf_fix_old_data(db, tx->tx_txg); 1180c717a561Smaybee data_old = db->db_buf; 1181fa9e4066Sahrens } 1182c717a561Smaybee ASSERT(data_old != NULL); 118382c9918fSTim Haley } 1184c717a561Smaybee dr->dt.dl.dr_data = data_old; 1185c717a561Smaybee } else { 1186c717a561Smaybee mutex_init(&dr->dt.di.dr_mtx, NULL, MUTEX_DEFAULT, NULL); 1187c717a561Smaybee list_create(&dr->dt.di.dr_children, 1188c717a561Smaybee sizeof (dbuf_dirty_record_t), 1189c717a561Smaybee offsetof(dbuf_dirty_record_t, dr_dirty_node)); 1190fa9e4066Sahrens } 1191*69962b56SMatthew Ahrens if (db->db_blkid != DMU_BONUS_BLKID && os->os_dsl_dataset != NULL) 1192*69962b56SMatthew Ahrens dr->dr_accounted = db->db.db_size; 1193c717a561Smaybee dr->dr_dbuf = db; 1194c717a561Smaybee dr->dr_txg = tx->tx_txg; 1195c717a561Smaybee dr->dr_next = *drp; 1196c717a561Smaybee *drp = dr; 1197fa9e4066Sahrens 1198fa9e4066Sahrens /* 1199fa9e4066Sahrens * We could have been freed_in_flight between the dbuf_noread 1200fa9e4066Sahrens * and dbuf_dirty. We win, as though the dbuf_noread() had 1201fa9e4066Sahrens * happened after the free. 1202fa9e4066Sahrens */ 12030a586ceaSMark Shellenbaum if (db->db_level == 0 && db->db_blkid != DMU_BONUS_BLKID && 12040a586ceaSMark Shellenbaum db->db_blkid != DMU_SPILL_BLKID) { 1205c717a561Smaybee mutex_enter(&dn->dn_mtx); 1206fa9e4066Sahrens dnode_clear_range(dn, db->db_blkid, 1, tx); 1207fa9e4066Sahrens mutex_exit(&dn->dn_mtx); 1208c717a561Smaybee db->db_freed_in_flight = FALSE; 1209c717a561Smaybee } 1210fa9e4066Sahrens 1211fa9e4066Sahrens /* 1212fa9e4066Sahrens * This buffer is now part of this txg 1213fa9e4066Sahrens */ 1214fa9e4066Sahrens dbuf_add_ref(db, (void *)(uintptr_t)tx->tx_txg); 1215fa9e4066Sahrens db->db_dirtycnt += 1; 1216fa9e4066Sahrens ASSERT3U(db->db_dirtycnt, <=, 3); 1217fa9e4066Sahrens 1218fa9e4066Sahrens mutex_exit(&db->db_mtx); 1219fa9e4066Sahrens 12200a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID || 12210a586ceaSMark Shellenbaum db->db_blkid == DMU_SPILL_BLKID) { 1222c717a561Smaybee mutex_enter(&dn->dn_mtx); 1223c717a561Smaybee ASSERT(!list_link_active(&dr->dr_dirty_node)); 1224c717a561Smaybee list_insert_tail(&dn->dn_dirty_records[txgoff], dr); 1225c717a561Smaybee mutex_exit(&dn->dn_mtx); 1226fa9e4066Sahrens dnode_setdirty(dn, tx); 1227744947dcSTom Erickson DB_DNODE_EXIT(db); 1228c717a561Smaybee return (dr); 1229d3469faaSMark Maybee } else if (do_free_accounting) { 1230d3469faaSMark Maybee blkptr_t *bp = db->db_blkptr; 1231d3469faaSMark Maybee int64_t willfree = (bp && !BP_IS_HOLE(bp)) ? 1232b24ab676SJeff Bonwick bp_get_dsize(os->os_spa, bp) : db->db.db_size; 1233d3469faaSMark Maybee /* 1234d3469faaSMark Maybee * This is only a guess -- if the dbuf is dirty 1235d3469faaSMark Maybee * in a previous txg, we don't know how much 1236d3469faaSMark Maybee * space it will use on disk yet. We should 1237d3469faaSMark Maybee * really have the struct_rwlock to access 1238d3469faaSMark Maybee * db_blkptr, but since this is just a guess, 1239d3469faaSMark Maybee * it's OK if we get an odd answer. 1240d3469faaSMark Maybee */ 1241837b568bSGeorge Wilson ddt_prefetch(os->os_spa, bp); 1242d3469faaSMark Maybee dnode_willuse_space(dn, -willfree, tx); 1243fa9e4066Sahrens } 1244fa9e4066Sahrens 1245fa9e4066Sahrens if (!RW_WRITE_HELD(&dn->dn_struct_rwlock)) { 1246fa9e4066Sahrens rw_enter(&dn->dn_struct_rwlock, RW_READER); 1247fa9e4066Sahrens drop_struct_lock = TRUE; 1248fa9e4066Sahrens } 1249fa9e4066Sahrens 12508346f03fSJonathan W Adams if (db->db_level == 0) { 12518346f03fSJonathan W Adams dnode_new_blkid(dn, db->db_blkid, tx, drop_struct_lock); 12528346f03fSJonathan W Adams ASSERT(dn->dn_maxblkid >= db->db_blkid); 12538346f03fSJonathan W Adams } 12548346f03fSJonathan W Adams 125544eda4d7Smaybee if (db->db_level+1 < dn->dn_nlevels) { 1256c717a561Smaybee dmu_buf_impl_t *parent = db->db_parent; 1257c717a561Smaybee dbuf_dirty_record_t *di; 1258c717a561Smaybee int parent_held = FALSE; 1259c717a561Smaybee 1260c717a561Smaybee if (db->db_parent == NULL || db->db_parent == dn->dn_dbuf) { 1261fa9e4066Sahrens int epbs = dn->dn_indblkshift - SPA_BLKPTRSHIFT; 1262c717a561Smaybee 1263fa9e4066Sahrens parent = dbuf_hold_level(dn, db->db_level+1, 1264fa9e4066Sahrens db->db_blkid >> epbs, FTAG); 126501025c89SJohn Harres ASSERT(parent != NULL); 1266c717a561Smaybee parent_held = TRUE; 1267c717a561Smaybee } 1268fa9e4066Sahrens if (drop_struct_lock) 1269fa9e4066Sahrens rw_exit(&dn->dn_struct_rwlock); 1270c717a561Smaybee ASSERT3U(db->db_level+1, ==, parent->db_level); 1271c717a561Smaybee di = dbuf_dirty(parent, tx); 1272c717a561Smaybee if (parent_held) 1273ea8dc4b6Seschrock dbuf_rele(parent, FTAG); 1274c717a561Smaybee 1275c717a561Smaybee mutex_enter(&db->db_mtx); 1276*69962b56SMatthew Ahrens /* 1277*69962b56SMatthew Ahrens * Since we've dropped the mutex, it's possible that 1278*69962b56SMatthew Ahrens * dbuf_undirty() might have changed this out from under us. 1279*69962b56SMatthew Ahrens */ 1280c717a561Smaybee if (db->db_last_dirty == dr || 1281c717a561Smaybee dn->dn_object == DMU_META_DNODE_OBJECT) { 1282c717a561Smaybee mutex_enter(&di->dt.di.dr_mtx); 1283c717a561Smaybee ASSERT3U(di->dr_txg, ==, tx->tx_txg); 1284c717a561Smaybee ASSERT(!list_link_active(&dr->dr_dirty_node)); 1285c717a561Smaybee list_insert_tail(&di->dt.di.dr_children, dr); 1286c717a561Smaybee mutex_exit(&di->dt.di.dr_mtx); 1287c717a561Smaybee dr->dr_parent = di; 1288c717a561Smaybee } 1289c717a561Smaybee mutex_exit(&db->db_mtx); 1290fa9e4066Sahrens } else { 1291c717a561Smaybee ASSERT(db->db_level+1 == dn->dn_nlevels); 1292c717a561Smaybee ASSERT(db->db_blkid < dn->dn_nblkptr); 1293744947dcSTom Erickson ASSERT(db->db_parent == NULL || db->db_parent == dn->dn_dbuf); 1294c717a561Smaybee mutex_enter(&dn->dn_mtx); 1295c717a561Smaybee ASSERT(!list_link_active(&dr->dr_dirty_node)); 1296c717a561Smaybee list_insert_tail(&dn->dn_dirty_records[txgoff], dr); 1297c717a561Smaybee mutex_exit(&dn->dn_mtx); 1298fa9e4066Sahrens if (drop_struct_lock) 1299fa9e4066Sahrens rw_exit(&dn->dn_struct_rwlock); 1300fa9e4066Sahrens } 1301fa9e4066Sahrens 1302fa9e4066Sahrens dnode_setdirty(dn, tx); 1303744947dcSTom Erickson DB_DNODE_EXIT(db); 1304c717a561Smaybee return (dr); 1305fa9e4066Sahrens } 1306fa9e4066Sahrens 13073b2aab18SMatthew Ahrens /* 13083e30c24aSWill Andrews * Undirty a buffer in the transaction group referenced by the given 13093e30c24aSWill Andrews * transaction. Return whether this evicted the dbuf. 13103b2aab18SMatthew Ahrens */ 13113b2aab18SMatthew Ahrens static boolean_t 1312fa9e4066Sahrens dbuf_undirty(dmu_buf_impl_t *db, dmu_tx_t *tx) 1313fa9e4066Sahrens { 1314744947dcSTom Erickson dnode_t *dn; 1315c717a561Smaybee uint64_t txg = tx->tx_txg; 131617f17c2dSbonwick dbuf_dirty_record_t *dr, **drp; 1317fa9e4066Sahrens 1318c717a561Smaybee ASSERT(txg != 0); 13190a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 13203b2aab18SMatthew Ahrens ASSERT0(db->db_level); 13213b2aab18SMatthew Ahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 1322fa9e4066Sahrens 1323fa9e4066Sahrens /* 1324fa9e4066Sahrens * If this buffer is not dirty, we're done. 1325fa9e4066Sahrens */ 132617f17c2dSbonwick for (drp = &db->db_last_dirty; (dr = *drp) != NULL; drp = &dr->dr_next) 1327c717a561Smaybee if (dr->dr_txg <= txg) 1328c717a561Smaybee break; 13293b2aab18SMatthew Ahrens if (dr == NULL || dr->dr_txg < txg) 13303b2aab18SMatthew Ahrens return (B_FALSE); 1331c717a561Smaybee ASSERT(dr->dr_txg == txg); 1332b24ab676SJeff Bonwick ASSERT(dr->dr_dbuf == db); 1333fa9e4066Sahrens 1334744947dcSTom Erickson DB_DNODE_ENTER(db); 1335744947dcSTom Erickson dn = DB_DNODE(db); 1336744947dcSTom Erickson 1337fa9e4066Sahrens /* 13383b2aab18SMatthew Ahrens * Note: This code will probably work even if there are concurrent 13393b2aab18SMatthew Ahrens * holders, but it is untested in that scenerio, as the ZPL and 13403b2aab18SMatthew Ahrens * ztest have additional locking (the range locks) that prevents 13413b2aab18SMatthew Ahrens * that type of concurrent access. 1342fa9e4066Sahrens */ 13433b2aab18SMatthew Ahrens ASSERT3U(refcount_count(&db->db_holds), ==, db->db_dirtycnt); 1344fa9e4066Sahrens 1345fa9e4066Sahrens dprintf_dbuf(db, "size=%llx\n", (u_longlong_t)db->db.db_size); 1346fa9e4066Sahrens 1347fa9e4066Sahrens ASSERT(db->db.db_size != 0); 1348fa9e4066Sahrens 1349*69962b56SMatthew Ahrens /* 1350*69962b56SMatthew Ahrens * Any space we accounted for in dp_dirty_* will be cleaned up by 1351*69962b56SMatthew Ahrens * dsl_pool_sync(). This is relatively rare so the discrepancy 1352*69962b56SMatthew Ahrens * is not a big deal. 1353*69962b56SMatthew Ahrens */ 1354fa9e4066Sahrens 135517f17c2dSbonwick *drp = dr->dr_next; 1356c717a561Smaybee 13573f2366c2SGordon Ross /* 13583f2366c2SGordon Ross * Note that there are three places in dbuf_dirty() 13593f2366c2SGordon Ross * where this dirty record may be put on a list. 13603f2366c2SGordon Ross * Make sure to do a list_remove corresponding to 13613f2366c2SGordon Ross * every one of those list_insert calls. 13623f2366c2SGordon Ross */ 1363c717a561Smaybee if (dr->dr_parent) { 1364c717a561Smaybee mutex_enter(&dr->dr_parent->dt.di.dr_mtx); 1365c717a561Smaybee list_remove(&dr->dr_parent->dt.di.dr_children, dr); 1366c717a561Smaybee mutex_exit(&dr->dr_parent->dt.di.dr_mtx); 13673f2366c2SGordon Ross } else if (db->db_blkid == DMU_SPILL_BLKID || 13683f2366c2SGordon Ross db->db_level+1 == dn->dn_nlevels) { 1369cdb0ab79Smaybee ASSERT(db->db_blkptr == NULL || db->db_parent == dn->dn_dbuf); 1370fa9e4066Sahrens mutex_enter(&dn->dn_mtx); 1371c717a561Smaybee list_remove(&dn->dn_dirty_records[txg & TXG_MASK], dr); 1372fa9e4066Sahrens mutex_exit(&dn->dn_mtx); 1373c717a561Smaybee } 1374744947dcSTom Erickson DB_DNODE_EXIT(db); 1375c717a561Smaybee 137682c9918fSTim Haley if (db->db_state != DB_NOFILL) { 1377c717a561Smaybee dbuf_unoverride(dr); 1378c717a561Smaybee 1379c717a561Smaybee ASSERT(db->db_buf != NULL); 1380c717a561Smaybee ASSERT(dr->dt.dl.dr_data != NULL); 1381c717a561Smaybee if (dr->dt.dl.dr_data != db->db_buf) 13823b2aab18SMatthew Ahrens VERIFY(arc_buf_remove_ref(dr->dt.dl.dr_data, db)); 1383c717a561Smaybee } 1384c717a561Smaybee kmem_free(dr, sizeof (dbuf_dirty_record_t)); 1385fa9e4066Sahrens 1386fa9e4066Sahrens ASSERT(db->db_dirtycnt > 0); 1387fa9e4066Sahrens db->db_dirtycnt -= 1; 1388fa9e4066Sahrens 1389c717a561Smaybee if (refcount_remove(&db->db_holds, (void *)(uintptr_t)txg) == 0) { 1390ea8dc4b6Seschrock arc_buf_t *buf = db->db_buf; 1391fa9e4066Sahrens 1392b24ab676SJeff Bonwick ASSERT(db->db_state == DB_NOFILL || arc_released(buf)); 1393ea8dc4b6Seschrock dbuf_set_data(db, NULL); 13943b2aab18SMatthew Ahrens VERIFY(arc_buf_remove_ref(buf, db)); 1395fa9e4066Sahrens dbuf_evict(db); 13963b2aab18SMatthew Ahrens return (B_TRUE); 1397fa9e4066Sahrens } 1398fa9e4066Sahrens 13993b2aab18SMatthew Ahrens return (B_FALSE); 1400fa9e4066Sahrens } 1401fa9e4066Sahrens 1402fa9e4066Sahrens #pragma weak dmu_buf_will_dirty = dbuf_will_dirty 1403fa9e4066Sahrens void 1404fa9e4066Sahrens dbuf_will_dirty(dmu_buf_impl_t *db, dmu_tx_t *tx) 1405fa9e4066Sahrens { 14061ab7f2deSmaybee int rf = DB_RF_MUST_SUCCEED | DB_RF_NOPREFETCH; 1407fa9e4066Sahrens 1408fa9e4066Sahrens ASSERT(tx->tx_txg != 0); 1409fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 1410fa9e4066Sahrens 1411744947dcSTom Erickson DB_DNODE_ENTER(db); 1412744947dcSTom Erickson if (RW_WRITE_HELD(&DB_DNODE(db)->dn_struct_rwlock)) 1413fa9e4066Sahrens rf |= DB_RF_HAVESTRUCT; 1414744947dcSTom Erickson DB_DNODE_EXIT(db); 1415ea8dc4b6Seschrock (void) dbuf_read(db, NULL, rf); 1416c717a561Smaybee (void) dbuf_dirty(db, tx); 1417fa9e4066Sahrens } 1418fa9e4066Sahrens 1419fa9e4066Sahrens void 142082c9918fSTim Haley dmu_buf_will_not_fill(dmu_buf_t *db_fake, dmu_tx_t *tx) 142182c9918fSTim Haley { 142282c9918fSTim Haley dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 142382c9918fSTim Haley 142482c9918fSTim Haley db->db_state = DB_NOFILL; 142582c9918fSTim Haley 142682c9918fSTim Haley dmu_buf_will_fill(db_fake, tx); 142782c9918fSTim Haley } 142882c9918fSTim Haley 142982c9918fSTim Haley void 1430ea8dc4b6Seschrock dmu_buf_will_fill(dmu_buf_t *db_fake, dmu_tx_t *tx) 1431fa9e4066Sahrens { 1432ea8dc4b6Seschrock dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 1433ea8dc4b6Seschrock 14340a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 1435fa9e4066Sahrens ASSERT(tx->tx_txg != 0); 1436fa9e4066Sahrens ASSERT(db->db_level == 0); 1437fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 1438fa9e4066Sahrens 1439ea8dc4b6Seschrock ASSERT(db->db.db_object != DMU_META_DNODE_OBJECT || 1440fa9e4066Sahrens dmu_tx_private_ok(tx)); 1441fa9e4066Sahrens 1442fa9e4066Sahrens dbuf_noread(db); 1443c717a561Smaybee (void) dbuf_dirty(db, tx); 1444fa9e4066Sahrens } 1445fa9e4066Sahrens 1446fa9e4066Sahrens #pragma weak dmu_buf_fill_done = dbuf_fill_done 1447fa9e4066Sahrens /* ARGSUSED */ 1448fa9e4066Sahrens void 1449fa9e4066Sahrens dbuf_fill_done(dmu_buf_impl_t *db, dmu_tx_t *tx) 1450fa9e4066Sahrens { 1451fa9e4066Sahrens mutex_enter(&db->db_mtx); 14529c9dc39aSek110237 DBUF_VERIFY(db); 1453fa9e4066Sahrens 1454fa9e4066Sahrens if (db->db_state == DB_FILL) { 1455c717a561Smaybee if (db->db_level == 0 && db->db_freed_in_flight) { 14560a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 1457fa9e4066Sahrens /* we were freed while filling */ 1458fa9e4066Sahrens /* XXX dbuf_undirty? */ 1459fa9e4066Sahrens bzero(db->db.db_data, db->db.db_size); 1460c717a561Smaybee db->db_freed_in_flight = FALSE; 1461fa9e4066Sahrens } 1462fa9e4066Sahrens db->db_state = DB_CACHED; 1463fa9e4066Sahrens cv_broadcast(&db->db_changed); 1464fa9e4066Sahrens } 1465fa9e4066Sahrens mutex_exit(&db->db_mtx); 1466fa9e4066Sahrens } 1467fa9e4066Sahrens 1468ea8dc4b6Seschrock /* 14692fdbea25SAleksandr Guzovskiy * Directly assign a provided arc buf to a given dbuf if it's not referenced 14702fdbea25SAleksandr Guzovskiy * by anybody except our caller. Otherwise copy arcbuf's contents to dbuf. 14712fdbea25SAleksandr Guzovskiy */ 14722fdbea25SAleksandr Guzovskiy void 14732fdbea25SAleksandr Guzovskiy dbuf_assign_arcbuf(dmu_buf_impl_t *db, arc_buf_t *buf, dmu_tx_t *tx) 14742fdbea25SAleksandr Guzovskiy { 14752fdbea25SAleksandr Guzovskiy ASSERT(!refcount_is_zero(&db->db_holds)); 14760a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 14772fdbea25SAleksandr Guzovskiy ASSERT(db->db_level == 0); 14782fdbea25SAleksandr Guzovskiy ASSERT(DBUF_GET_BUFC_TYPE(db) == ARC_BUFC_DATA); 14792fdbea25SAleksandr Guzovskiy ASSERT(buf != NULL); 14802fdbea25SAleksandr Guzovskiy ASSERT(arc_buf_size(buf) == db->db.db_size); 14812fdbea25SAleksandr Guzovskiy ASSERT(tx->tx_txg != 0); 14822fdbea25SAleksandr Guzovskiy 14832fdbea25SAleksandr Guzovskiy arc_return_buf(buf, db); 14842fdbea25SAleksandr Guzovskiy ASSERT(arc_released(buf)); 14852fdbea25SAleksandr Guzovskiy 14862fdbea25SAleksandr Guzovskiy mutex_enter(&db->db_mtx); 14872fdbea25SAleksandr Guzovskiy 14882fdbea25SAleksandr Guzovskiy while (db->db_state == DB_READ || db->db_state == DB_FILL) 14892fdbea25SAleksandr Guzovskiy cv_wait(&db->db_changed, &db->db_mtx); 14902fdbea25SAleksandr Guzovskiy 14912fdbea25SAleksandr Guzovskiy ASSERT(db->db_state == DB_CACHED || db->db_state == DB_UNCACHED); 14922fdbea25SAleksandr Guzovskiy 14932fdbea25SAleksandr Guzovskiy if (db->db_state == DB_CACHED && 14942fdbea25SAleksandr Guzovskiy refcount_count(&db->db_holds) - 1 > db->db_dirtycnt) { 14952fdbea25SAleksandr Guzovskiy mutex_exit(&db->db_mtx); 14962fdbea25SAleksandr Guzovskiy (void) dbuf_dirty(db, tx); 14972fdbea25SAleksandr Guzovskiy bcopy(buf->b_data, db->db.db_data, db->db.db_size); 14983b2aab18SMatthew Ahrens VERIFY(arc_buf_remove_ref(buf, db)); 1499c242f9a0Schunli zhang - Sun Microsystems - Irvine United States xuio_stat_wbuf_copied(); 15002fdbea25SAleksandr Guzovskiy return; 15012fdbea25SAleksandr Guzovskiy } 15022fdbea25SAleksandr Guzovskiy 1503c242f9a0Schunli zhang - Sun Microsystems - Irvine United States xuio_stat_wbuf_nocopy(); 15042fdbea25SAleksandr Guzovskiy if (db->db_state == DB_CACHED) { 15052fdbea25SAleksandr Guzovskiy dbuf_dirty_record_t *dr = db->db_last_dirty; 15062fdbea25SAleksandr Guzovskiy 15072fdbea25SAleksandr Guzovskiy ASSERT(db->db_buf != NULL); 15082fdbea25SAleksandr Guzovskiy if (dr != NULL && dr->dr_txg == tx->tx_txg) { 15092fdbea25SAleksandr Guzovskiy ASSERT(dr->dt.dl.dr_data == db->db_buf); 15102fdbea25SAleksandr Guzovskiy if (!arc_released(db->db_buf)) { 15112fdbea25SAleksandr Guzovskiy ASSERT(dr->dt.dl.dr_override_state == 15122fdbea25SAleksandr Guzovskiy DR_OVERRIDDEN); 15132fdbea25SAleksandr Guzovskiy arc_release(db->db_buf, db); 15142fdbea25SAleksandr Guzovskiy } 15152fdbea25SAleksandr Guzovskiy dr->dt.dl.dr_data = buf; 15163b2aab18SMatthew Ahrens VERIFY(arc_buf_remove_ref(db->db_buf, db)); 15172fdbea25SAleksandr Guzovskiy } else if (dr == NULL || dr->dt.dl.dr_data != db->db_buf) { 15182fdbea25SAleksandr Guzovskiy arc_release(db->db_buf, db); 15193b2aab18SMatthew Ahrens VERIFY(arc_buf_remove_ref(db->db_buf, db)); 15202fdbea25SAleksandr Guzovskiy } 15212fdbea25SAleksandr Guzovskiy db->db_buf = NULL; 15222fdbea25SAleksandr Guzovskiy } 15232fdbea25SAleksandr Guzovskiy ASSERT(db->db_buf == NULL); 15242fdbea25SAleksandr Guzovskiy dbuf_set_data(db, buf); 15252fdbea25SAleksandr Guzovskiy db->db_state = DB_FILL; 15262fdbea25SAleksandr Guzovskiy mutex_exit(&db->db_mtx); 15272fdbea25SAleksandr Guzovskiy (void) dbuf_dirty(db, tx); 15282fdbea25SAleksandr Guzovskiy dbuf_fill_done(db, tx); 15292fdbea25SAleksandr Guzovskiy } 15302fdbea25SAleksandr Guzovskiy 15312fdbea25SAleksandr Guzovskiy /* 1532ea8dc4b6Seschrock * "Clear" the contents of this dbuf. This will mark the dbuf 1533*69962b56SMatthew Ahrens * EVICTING and clear *most* of its references. Unfortunately, 1534ea8dc4b6Seschrock * when we are not holding the dn_dbufs_mtx, we can't clear the 1535ea8dc4b6Seschrock * entry in the dn_dbufs list. We have to wait until dbuf_destroy() 1536ea8dc4b6Seschrock * in this case. For callers from the DMU we will usually see: 1537ea8dc4b6Seschrock * dbuf_clear()->arc_buf_evict()->dbuf_do_evict()->dbuf_destroy() 1538ea8dc4b6Seschrock * For the arc callback, we will usually see: 1539ea8dc4b6Seschrock * dbuf_do_evict()->dbuf_clear();dbuf_destroy() 1540ea8dc4b6Seschrock * Sometimes, though, we will get a mix of these two: 1541ea8dc4b6Seschrock * DMU: dbuf_clear()->arc_buf_evict() 1542ea8dc4b6Seschrock * ARC: dbuf_do_evict()->dbuf_destroy() 1543ea8dc4b6Seschrock */ 1544ea8dc4b6Seschrock void 1545fa9e4066Sahrens dbuf_clear(dmu_buf_impl_t *db) 1546fa9e4066Sahrens { 1547744947dcSTom Erickson dnode_t *dn; 1548ea8dc4b6Seschrock dmu_buf_impl_t *parent = db->db_parent; 1549744947dcSTom Erickson dmu_buf_impl_t *dndb; 1550ea8dc4b6Seschrock int dbuf_gone = FALSE; 1551fa9e4066Sahrens 1552fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 1553fa9e4066Sahrens ASSERT(refcount_is_zero(&db->db_holds)); 1554fa9e4066Sahrens 1555ea8dc4b6Seschrock dbuf_evict_user(db); 1556ea8dc4b6Seschrock 1557fa9e4066Sahrens if (db->db_state == DB_CACHED) { 1558ea8dc4b6Seschrock ASSERT(db->db.db_data != NULL); 15590a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 1560ea8dc4b6Seschrock zio_buf_free(db->db.db_data, DN_MAX_BONUSLEN); 15615a98e54bSBrendan Gregg - Sun Microsystems arc_space_return(DN_MAX_BONUSLEN, ARC_SPACE_OTHER); 15620e8c6158Smaybee } 1563fa9e4066Sahrens db->db.db_data = NULL; 1564fa9e4066Sahrens db->db_state = DB_UNCACHED; 1565fa9e4066Sahrens } 1566fa9e4066Sahrens 156782c9918fSTim Haley ASSERT(db->db_state == DB_UNCACHED || db->db_state == DB_NOFILL); 1568fa9e4066Sahrens ASSERT(db->db_data_pending == NULL); 1569fa9e4066Sahrens 1570ea8dc4b6Seschrock db->db_state = DB_EVICTING; 1571ea8dc4b6Seschrock db->db_blkptr = NULL; 1572ea8dc4b6Seschrock 1573744947dcSTom Erickson DB_DNODE_ENTER(db); 1574744947dcSTom Erickson dn = DB_DNODE(db); 1575744947dcSTom Erickson dndb = dn->dn_dbuf; 15760a586ceaSMark Shellenbaum if (db->db_blkid != DMU_BONUS_BLKID && MUTEX_HELD(&dn->dn_dbufs_mtx)) { 1577ea8dc4b6Seschrock list_remove(&dn->dn_dbufs, db); 1578744947dcSTom Erickson (void) atomic_dec_32_nv(&dn->dn_dbufs_count); 1579744947dcSTom Erickson membar_producer(); 1580744947dcSTom Erickson DB_DNODE_EXIT(db); 1581744947dcSTom Erickson /* 1582744947dcSTom Erickson * Decrementing the dbuf count means that the hold corresponding 1583744947dcSTom Erickson * to the removed dbuf is no longer discounted in dnode_move(), 1584744947dcSTom Erickson * so the dnode cannot be moved until after we release the hold. 1585744947dcSTom Erickson * The membar_producer() ensures visibility of the decremented 1586744947dcSTom Erickson * value in dnode_move(), since DB_DNODE_EXIT doesn't actually 1587744947dcSTom Erickson * release any lock. 1588744947dcSTom Erickson */ 1589ea8dc4b6Seschrock dnode_rele(dn, db); 1590744947dcSTom Erickson db->db_dnode_handle = NULL; 1591744947dcSTom Erickson } else { 1592744947dcSTom Erickson DB_DNODE_EXIT(db); 1593ea8dc4b6Seschrock } 1594ea8dc4b6Seschrock 1595ea8dc4b6Seschrock if (db->db_buf) 1596ea8dc4b6Seschrock dbuf_gone = arc_buf_evict(db->db_buf); 1597ea8dc4b6Seschrock 1598ea8dc4b6Seschrock if (!dbuf_gone) 1599fa9e4066Sahrens mutex_exit(&db->db_mtx); 1600fa9e4066Sahrens 1601fa9e4066Sahrens /* 1602744947dcSTom Erickson * If this dbuf is referenced from an indirect dbuf, 1603fa9e4066Sahrens * decrement the ref count on the indirect dbuf. 1604fa9e4066Sahrens */ 1605c543ec06Sahrens if (parent && parent != dndb) 1606ea8dc4b6Seschrock dbuf_rele(parent, db); 1607fa9e4066Sahrens } 1608fa9e4066Sahrens 1609fa9e4066Sahrens static int 1610fa9e4066Sahrens dbuf_findbp(dnode_t *dn, int level, uint64_t blkid, int fail_sparse, 1611fa9e4066Sahrens dmu_buf_impl_t **parentp, blkptr_t **bpp) 1612fa9e4066Sahrens { 1613fa9e4066Sahrens int nlevels, epbs; 1614fa9e4066Sahrens 16150b69c2f0Sahrens *parentp = NULL; 16160b69c2f0Sahrens *bpp = NULL; 16170b69c2f0Sahrens 16180a586ceaSMark Shellenbaum ASSERT(blkid != DMU_BONUS_BLKID); 16190a586ceaSMark Shellenbaum 16200a586ceaSMark Shellenbaum if (blkid == DMU_SPILL_BLKID) { 16210a586ceaSMark Shellenbaum mutex_enter(&dn->dn_mtx); 162206e0070dSMark Shellenbaum if (dn->dn_have_spill && 162306e0070dSMark Shellenbaum (dn->dn_phys->dn_flags & DNODE_FLAG_SPILL_BLKPTR)) 16240a586ceaSMark Shellenbaum *bpp = &dn->dn_phys->dn_spill; 16250a586ceaSMark Shellenbaum else 16260a586ceaSMark Shellenbaum *bpp = NULL; 16270a586ceaSMark Shellenbaum dbuf_add_ref(dn->dn_dbuf, NULL); 16280a586ceaSMark Shellenbaum *parentp = dn->dn_dbuf; 16290a586ceaSMark Shellenbaum mutex_exit(&dn->dn_mtx); 16300a586ceaSMark Shellenbaum return (0); 16310a586ceaSMark Shellenbaum } 1632ea8dc4b6Seschrock 1633fa9e4066Sahrens if (dn->dn_phys->dn_nlevels == 0) 1634fa9e4066Sahrens nlevels = 1; 1635fa9e4066Sahrens else 1636fa9e4066Sahrens nlevels = dn->dn_phys->dn_nlevels; 1637fa9e4066Sahrens 1638fa9e4066Sahrens epbs = dn->dn_indblkshift - SPA_BLKPTRSHIFT; 1639fa9e4066Sahrens 1640fa9e4066Sahrens ASSERT3U(level * epbs, <, 64); 1641fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 1642ea8dc4b6Seschrock if (level >= nlevels || 1643fa9e4066Sahrens (blkid > (dn->dn_phys->dn_maxblkid >> (level * epbs)))) { 1644fa9e4066Sahrens /* the buffer has no parent yet */ 1645be6fd75aSMatthew Ahrens return (SET_ERROR(ENOENT)); 1646fa9e4066Sahrens } else if (level < nlevels-1) { 1647fa9e4066Sahrens /* this block is referenced from an indirect block */ 1648fa9e4066Sahrens int err = dbuf_hold_impl(dn, level+1, 1649fa9e4066Sahrens blkid >> epbs, fail_sparse, NULL, parentp); 1650fa9e4066Sahrens if (err) 1651fa9e4066Sahrens return (err); 1652ea8dc4b6Seschrock err = dbuf_read(*parentp, NULL, 1653ea8dc4b6Seschrock (DB_RF_HAVESTRUCT | DB_RF_NOPREFETCH | DB_RF_CANFAIL)); 1654c543ec06Sahrens if (err) { 1655c543ec06Sahrens dbuf_rele(*parentp, NULL); 1656c543ec06Sahrens *parentp = NULL; 1657c543ec06Sahrens return (err); 1658c543ec06Sahrens } 1659fa9e4066Sahrens *bpp = ((blkptr_t *)(*parentp)->db.db_data) + 1660fa9e4066Sahrens (blkid & ((1ULL << epbs) - 1)); 1661c543ec06Sahrens return (0); 1662fa9e4066Sahrens } else { 1663fa9e4066Sahrens /* the block is referenced from the dnode */ 1664fa9e4066Sahrens ASSERT3U(level, ==, nlevels-1); 1665fa9e4066Sahrens ASSERT(dn->dn_phys->dn_nblkptr == 0 || 1666fa9e4066Sahrens blkid < dn->dn_phys->dn_nblkptr); 1667c543ec06Sahrens if (dn->dn_dbuf) { 1668c543ec06Sahrens dbuf_add_ref(dn->dn_dbuf, NULL); 1669fa9e4066Sahrens *parentp = dn->dn_dbuf; 1670c543ec06Sahrens } 1671fa9e4066Sahrens *bpp = &dn->dn_phys->dn_blkptr[blkid]; 1672fa9e4066Sahrens return (0); 1673fa9e4066Sahrens } 1674fa9e4066Sahrens } 1675fa9e4066Sahrens 1676fa9e4066Sahrens static dmu_buf_impl_t * 1677fa9e4066Sahrens dbuf_create(dnode_t *dn, uint8_t level, uint64_t blkid, 1678fa9e4066Sahrens dmu_buf_impl_t *parent, blkptr_t *blkptr) 1679fa9e4066Sahrens { 1680503ad85cSMatthew Ahrens objset_t *os = dn->dn_objset; 1681fa9e4066Sahrens dmu_buf_impl_t *db, *odb; 1682fa9e4066Sahrens 1683fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 1684fa9e4066Sahrens ASSERT(dn->dn_type != DMU_OT_NONE); 1685fa9e4066Sahrens 1686fa9e4066Sahrens db = kmem_cache_alloc(dbuf_cache, KM_SLEEP); 1687fa9e4066Sahrens 1688fa9e4066Sahrens db->db_objset = os; 1689fa9e4066Sahrens db->db.db_object = dn->dn_object; 1690fa9e4066Sahrens db->db_level = level; 1691fa9e4066Sahrens db->db_blkid = blkid; 1692c717a561Smaybee db->db_last_dirty = NULL; 1693ea8dc4b6Seschrock db->db_dirtycnt = 0; 1694744947dcSTom Erickson db->db_dnode_handle = dn->dn_handle; 1695ea8dc4b6Seschrock db->db_parent = parent; 1696ea8dc4b6Seschrock db->db_blkptr = blkptr; 1697fa9e4066Sahrens 1698c717a561Smaybee db->db_user_ptr = NULL; 1699c717a561Smaybee db->db_user_data_ptr_ptr = NULL; 1700c717a561Smaybee db->db_evict_func = NULL; 1701c717a561Smaybee db->db_immediate_evict = 0; 1702c717a561Smaybee db->db_freed_in_flight = 0; 1703ea8dc4b6Seschrock 17040a586ceaSMark Shellenbaum if (blkid == DMU_BONUS_BLKID) { 1705ea8dc4b6Seschrock ASSERT3P(parent, ==, dn->dn_dbuf); 17061934e92fSmaybee db->db.db_size = DN_MAX_BONUSLEN - 17071934e92fSmaybee (dn->dn_nblkptr-1) * sizeof (blkptr_t); 17081934e92fSmaybee ASSERT3U(db->db.db_size, >=, dn->dn_bonuslen); 17090a586ceaSMark Shellenbaum db->db.db_offset = DMU_BONUS_BLKID; 1710ea8dc4b6Seschrock db->db_state = DB_UNCACHED; 1711ea8dc4b6Seschrock /* the bonus dbuf is not placed in the hash table */ 17125a98e54bSBrendan Gregg - Sun Microsystems arc_space_consume(sizeof (dmu_buf_impl_t), ARC_SPACE_OTHER); 1713ea8dc4b6Seschrock return (db); 17140a586ceaSMark Shellenbaum } else if (blkid == DMU_SPILL_BLKID) { 17150a586ceaSMark Shellenbaum db->db.db_size = (blkptr != NULL) ? 17160a586ceaSMark Shellenbaum BP_GET_LSIZE(blkptr) : SPA_MINBLOCKSIZE; 17170a586ceaSMark Shellenbaum db->db.db_offset = 0; 1718fa9e4066Sahrens } else { 1719fa9e4066Sahrens int blocksize = 1720fa9e4066Sahrens db->db_level ? 1 << dn->dn_indblkshift : dn->dn_datablksz; 1721fa9e4066Sahrens db->db.db_size = blocksize; 1722fa9e4066Sahrens db->db.db_offset = db->db_blkid * blocksize; 1723fa9e4066Sahrens } 1724fa9e4066Sahrens 1725fa9e4066Sahrens /* 1726fa9e4066Sahrens * Hold the dn_dbufs_mtx while we get the new dbuf 1727fa9e4066Sahrens * in the hash table *and* added to the dbufs list. 1728fa9e4066Sahrens * This prevents a possible deadlock with someone 1729fa9e4066Sahrens * trying to look up this dbuf before its added to the 1730fa9e4066Sahrens * dn_dbufs list. 1731fa9e4066Sahrens */ 1732fa9e4066Sahrens mutex_enter(&dn->dn_dbufs_mtx); 1733ea8dc4b6Seschrock db->db_state = DB_EVICTING; 1734fa9e4066Sahrens if ((odb = dbuf_hash_insert(db)) != NULL) { 1735fa9e4066Sahrens /* someone else inserted it first */ 1736fa9e4066Sahrens kmem_cache_free(dbuf_cache, db); 1737fa9e4066Sahrens mutex_exit(&dn->dn_dbufs_mtx); 1738fa9e4066Sahrens return (odb); 1739fa9e4066Sahrens } 1740fa9e4066Sahrens list_insert_head(&dn->dn_dbufs, db); 1741713d6c20SMatthew Ahrens if (db->db_level == 0 && db->db_blkid >= 1742713d6c20SMatthew Ahrens dn->dn_unlisted_l0_blkid) 1743713d6c20SMatthew Ahrens dn->dn_unlisted_l0_blkid = db->db_blkid + 1; 1744ea8dc4b6Seschrock db->db_state = DB_UNCACHED; 1745fa9e4066Sahrens mutex_exit(&dn->dn_dbufs_mtx); 17465a98e54bSBrendan Gregg - Sun Microsystems arc_space_consume(sizeof (dmu_buf_impl_t), ARC_SPACE_OTHER); 1747fa9e4066Sahrens 1748fa9e4066Sahrens if (parent && parent != dn->dn_dbuf) 1749fa9e4066Sahrens dbuf_add_ref(parent, db); 1750fa9e4066Sahrens 1751ea8dc4b6Seschrock ASSERT(dn->dn_object == DMU_META_DNODE_OBJECT || 1752ea8dc4b6Seschrock refcount_count(&dn->dn_holds) > 0); 1753fa9e4066Sahrens (void) refcount_add(&dn->dn_holds, db); 1754744947dcSTom Erickson (void) atomic_inc_32_nv(&dn->dn_dbufs_count); 1755fa9e4066Sahrens 1756fa9e4066Sahrens dprintf_dbuf(db, "db=%p\n", db); 1757fa9e4066Sahrens 1758fa9e4066Sahrens return (db); 1759fa9e4066Sahrens } 1760fa9e4066Sahrens 1761fa9e4066Sahrens static int 1762ea8dc4b6Seschrock dbuf_do_evict(void *private) 1763fa9e4066Sahrens { 1764ea8dc4b6Seschrock arc_buf_t *buf = private; 1765ea8dc4b6Seschrock dmu_buf_impl_t *db = buf->b_private; 1766fa9e4066Sahrens 1767ea8dc4b6Seschrock if (!MUTEX_HELD(&db->db_mtx)) 1768ea8dc4b6Seschrock mutex_enter(&db->db_mtx); 1769ea8dc4b6Seschrock 1770ea8dc4b6Seschrock ASSERT(refcount_is_zero(&db->db_holds)); 1771ea8dc4b6Seschrock 1772ea8dc4b6Seschrock if (db->db_state != DB_EVICTING) { 1773ea8dc4b6Seschrock ASSERT(db->db_state == DB_CACHED); 17749c9dc39aSek110237 DBUF_VERIFY(db); 1775ea8dc4b6Seschrock db->db_buf = NULL; 1776ea8dc4b6Seschrock dbuf_evict(db); 1777ea8dc4b6Seschrock } else { 1778ea8dc4b6Seschrock mutex_exit(&db->db_mtx); 1779ea8dc4b6Seschrock dbuf_destroy(db); 1780fa9e4066Sahrens } 1781ea8dc4b6Seschrock return (0); 1782fa9e4066Sahrens } 1783fa9e4066Sahrens 1784fa9e4066Sahrens static void 1785fa9e4066Sahrens dbuf_destroy(dmu_buf_impl_t *db) 1786fa9e4066Sahrens { 1787fa9e4066Sahrens ASSERT(refcount_is_zero(&db->db_holds)); 1788fa9e4066Sahrens 17890a586ceaSMark Shellenbaum if (db->db_blkid != DMU_BONUS_BLKID) { 1790ea8dc4b6Seschrock /* 1791ea8dc4b6Seschrock * If this dbuf is still on the dn_dbufs list, 1792ea8dc4b6Seschrock * remove it from that list. 1793ea8dc4b6Seschrock */ 1794744947dcSTom Erickson if (db->db_dnode_handle != NULL) { 1795744947dcSTom Erickson dnode_t *dn; 17961934e92fSmaybee 1797744947dcSTom Erickson DB_DNODE_ENTER(db); 1798744947dcSTom Erickson dn = DB_DNODE(db); 17991934e92fSmaybee mutex_enter(&dn->dn_dbufs_mtx); 1800ea8dc4b6Seschrock list_remove(&dn->dn_dbufs, db); 1801744947dcSTom Erickson (void) atomic_dec_32_nv(&dn->dn_dbufs_count); 1802ea8dc4b6Seschrock mutex_exit(&dn->dn_dbufs_mtx); 1803744947dcSTom Erickson DB_DNODE_EXIT(db); 1804744947dcSTom Erickson /* 1805744947dcSTom Erickson * Decrementing the dbuf count means that the hold 1806744947dcSTom Erickson * corresponding to the removed dbuf is no longer 1807744947dcSTom Erickson * discounted in dnode_move(), so the dnode cannot be 1808744947dcSTom Erickson * moved until after we release the hold. 1809744947dcSTom Erickson */ 1810ea8dc4b6Seschrock dnode_rele(dn, db); 1811744947dcSTom Erickson db->db_dnode_handle = NULL; 1812ea8dc4b6Seschrock } 1813ea8dc4b6Seschrock dbuf_hash_remove(db); 1814ea8dc4b6Seschrock } 1815ea8dc4b6Seschrock db->db_parent = NULL; 1816ea8dc4b6Seschrock db->db_buf = NULL; 1817ea8dc4b6Seschrock 1818f82bfe17Sgw25295 ASSERT(!list_link_active(&db->db_link)); 1819fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 1820fa9e4066Sahrens ASSERT(db->db_hash_next == NULL); 1821fa9e4066Sahrens ASSERT(db->db_blkptr == NULL); 1822fa9e4066Sahrens ASSERT(db->db_data_pending == NULL); 1823fa9e4066Sahrens 1824fa9e4066Sahrens kmem_cache_free(dbuf_cache, db); 18255a98e54bSBrendan Gregg - Sun Microsystems arc_space_return(sizeof (dmu_buf_impl_t), ARC_SPACE_OTHER); 1826fa9e4066Sahrens } 1827fa9e4066Sahrens 1828fa9e4066Sahrens void 1829*69962b56SMatthew Ahrens dbuf_prefetch(dnode_t *dn, uint64_t blkid, zio_priority_t prio) 1830fa9e4066Sahrens { 183113506d1eSmaybee dmu_buf_impl_t *db = NULL; 1832fa9e4066Sahrens blkptr_t *bp = NULL; 1833fa9e4066Sahrens 18340a586ceaSMark Shellenbaum ASSERT(blkid != DMU_BONUS_BLKID); 1835fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 1836fa9e4066Sahrens 1837fa9e4066Sahrens if (dnode_block_freed(dn, blkid)) 1838fa9e4066Sahrens return; 1839fa9e4066Sahrens 1840fa9e4066Sahrens /* dbuf_find() returns with db_mtx held */ 1841fa9e4066Sahrens if (db = dbuf_find(dn, 0, blkid)) { 1842fa9e4066Sahrens /* 18439e9c486fSGeorge Wilson * This dbuf is already in the cache. We assume that 18449e9c486fSGeorge Wilson * it is already CACHED, or else about to be either 1845fa9e4066Sahrens * read or filled. 1846fa9e4066Sahrens */ 1847fa9e4066Sahrens mutex_exit(&db->db_mtx); 1848fa9e4066Sahrens return; 1849fa9e4066Sahrens } 1850fa9e4066Sahrens 185113506d1eSmaybee if (dbuf_findbp(dn, 0, blkid, TRUE, &db, &bp) == 0) { 1852fa9e4066Sahrens if (bp && !BP_IS_HOLE(bp)) { 1853b24ab676SJeff Bonwick dsl_dataset_t *ds = dn->dn_objset->os_dsl_dataset; 185413506d1eSmaybee uint32_t aflags = ARC_NOWAIT | ARC_PREFETCH; 1855ea8dc4b6Seschrock zbookmark_t zb; 1856b24ab676SJeff Bonwick 1857b24ab676SJeff Bonwick SET_BOOKMARK(&zb, ds ? ds->ds_object : DMU_META_OBJSET, 1858b24ab676SJeff Bonwick dn->dn_object, 0, blkid); 1859ea8dc4b6Seschrock 18601b912ec7SGeorge Wilson (void) arc_read(NULL, dn->dn_objset->os_spa, 1861*69962b56SMatthew Ahrens bp, NULL, NULL, prio, 1862fa9e4066Sahrens ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE, 186313506d1eSmaybee &aflags, &zb); 1864fa9e4066Sahrens } 186513506d1eSmaybee if (db) 186613506d1eSmaybee dbuf_rele(db, NULL); 1867fa9e4066Sahrens } 1868fa9e4066Sahrens } 1869fa9e4066Sahrens 1870fa9e4066Sahrens /* 1871fa9e4066Sahrens * Returns with db_holds incremented, and db_mtx not held. 1872fa9e4066Sahrens * Note: dn_struct_rwlock must be held. 1873fa9e4066Sahrens */ 1874fa9e4066Sahrens int 1875fa9e4066Sahrens dbuf_hold_impl(dnode_t *dn, uint8_t level, uint64_t blkid, int fail_sparse, 1876fa9e4066Sahrens void *tag, dmu_buf_impl_t **dbp) 1877fa9e4066Sahrens { 1878fa9e4066Sahrens dmu_buf_impl_t *db, *parent = NULL; 1879fa9e4066Sahrens 18800a586ceaSMark Shellenbaum ASSERT(blkid != DMU_BONUS_BLKID); 1881fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 1882fa9e4066Sahrens ASSERT3U(dn->dn_nlevels, >, level); 1883fa9e4066Sahrens 1884fa9e4066Sahrens *dbp = NULL; 1885ea8dc4b6Seschrock top: 1886fa9e4066Sahrens /* dbuf_find() returns with db_mtx held */ 1887fa9e4066Sahrens db = dbuf_find(dn, level, blkid); 1888fa9e4066Sahrens 1889fa9e4066Sahrens if (db == NULL) { 1890fa9e4066Sahrens blkptr_t *bp = NULL; 1891fa9e4066Sahrens int err; 1892fa9e4066Sahrens 1893c543ec06Sahrens ASSERT3P(parent, ==, NULL); 1894fa9e4066Sahrens err = dbuf_findbp(dn, level, blkid, fail_sparse, &parent, &bp); 1895fa9e4066Sahrens if (fail_sparse) { 1896fa9e4066Sahrens if (err == 0 && bp && BP_IS_HOLE(bp)) 1897be6fd75aSMatthew Ahrens err = SET_ERROR(ENOENT); 1898fa9e4066Sahrens if (err) { 1899c543ec06Sahrens if (parent) 1900ea8dc4b6Seschrock dbuf_rele(parent, NULL); 1901fa9e4066Sahrens return (err); 1902fa9e4066Sahrens } 1903fa9e4066Sahrens } 1904ea8dc4b6Seschrock if (err && err != ENOENT) 1905ea8dc4b6Seschrock return (err); 1906fa9e4066Sahrens db = dbuf_create(dn, level, blkid, parent, bp); 1907fa9e4066Sahrens } 1908fa9e4066Sahrens 1909ea8dc4b6Seschrock if (db->db_buf && refcount_is_zero(&db->db_holds)) { 1910ea8dc4b6Seschrock arc_buf_add_ref(db->db_buf, db); 1911ea8dc4b6Seschrock if (db->db_buf->b_data == NULL) { 1912ea8dc4b6Seschrock dbuf_clear(db); 1913c543ec06Sahrens if (parent) { 1914c543ec06Sahrens dbuf_rele(parent, NULL); 1915c543ec06Sahrens parent = NULL; 1916c543ec06Sahrens } 1917ea8dc4b6Seschrock goto top; 1918ea8dc4b6Seschrock } 1919ea8dc4b6Seschrock ASSERT3P(db->db.db_data, ==, db->db_buf->b_data); 1920ea8dc4b6Seschrock } 1921ea8dc4b6Seschrock 1922ea8dc4b6Seschrock ASSERT(db->db_buf == NULL || arc_referenced(db->db_buf)); 1923ea8dc4b6Seschrock 1924fa9e4066Sahrens /* 1925c717a561Smaybee * If this buffer is currently syncing out, and we are are 1926c717a561Smaybee * still referencing it from db_data, we need to make a copy 1927c717a561Smaybee * of it in case we decide we want to dirty it again in this txg. 1928fa9e4066Sahrens */ 19290a586ceaSMark Shellenbaum if (db->db_level == 0 && db->db_blkid != DMU_BONUS_BLKID && 1930ea8dc4b6Seschrock dn->dn_object != DMU_META_DNODE_OBJECT && 1931c717a561Smaybee db->db_state == DB_CACHED && db->db_data_pending) { 1932c717a561Smaybee dbuf_dirty_record_t *dr = db->db_data_pending; 1933c717a561Smaybee 1934c717a561Smaybee if (dr->dt.dl.dr_data == db->db_buf) { 1935ad23a2dbSjohansen arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 1936fa9e4066Sahrens 1937c717a561Smaybee dbuf_set_data(db, 1938744947dcSTom Erickson arc_buf_alloc(dn->dn_objset->os_spa, 1939c717a561Smaybee db->db.db_size, db, type)); 1940c717a561Smaybee bcopy(dr->dt.dl.dr_data->b_data, db->db.db_data, 1941fa9e4066Sahrens db->db.db_size); 1942fa9e4066Sahrens } 1943c717a561Smaybee } 1944fa9e4066Sahrens 1945ea8dc4b6Seschrock (void) refcount_add(&db->db_holds, tag); 1946fa9e4066Sahrens dbuf_update_data(db); 19479c9dc39aSek110237 DBUF_VERIFY(db); 1948fa9e4066Sahrens mutex_exit(&db->db_mtx); 1949fa9e4066Sahrens 1950fa9e4066Sahrens /* NOTE: we can't rele the parent until after we drop the db_mtx */ 1951c543ec06Sahrens if (parent) 1952ea8dc4b6Seschrock dbuf_rele(parent, NULL); 1953fa9e4066Sahrens 1954744947dcSTom Erickson ASSERT3P(DB_DNODE(db), ==, dn); 1955fa9e4066Sahrens ASSERT3U(db->db_blkid, ==, blkid); 1956fa9e4066Sahrens ASSERT3U(db->db_level, ==, level); 1957fa9e4066Sahrens *dbp = db; 1958fa9e4066Sahrens 1959fa9e4066Sahrens return (0); 1960fa9e4066Sahrens } 1961fa9e4066Sahrens 1962fa9e4066Sahrens dmu_buf_impl_t * 1963ea8dc4b6Seschrock dbuf_hold(dnode_t *dn, uint64_t blkid, void *tag) 1964fa9e4066Sahrens { 1965fa9e4066Sahrens dmu_buf_impl_t *db; 1966ea8dc4b6Seschrock int err = dbuf_hold_impl(dn, 0, blkid, FALSE, tag, &db); 1967ea8dc4b6Seschrock return (err ? NULL : db); 1968fa9e4066Sahrens } 1969fa9e4066Sahrens 1970fa9e4066Sahrens dmu_buf_impl_t * 1971fa9e4066Sahrens dbuf_hold_level(dnode_t *dn, int level, uint64_t blkid, void *tag) 1972fa9e4066Sahrens { 1973fa9e4066Sahrens dmu_buf_impl_t *db; 1974ea8dc4b6Seschrock int err = dbuf_hold_impl(dn, level, blkid, FALSE, tag, &db); 1975ea8dc4b6Seschrock return (err ? NULL : db); 1976fa9e4066Sahrens } 1977fa9e4066Sahrens 19781934e92fSmaybee void 1979ea8dc4b6Seschrock dbuf_create_bonus(dnode_t *dn) 1980fa9e4066Sahrens { 1981ea8dc4b6Seschrock ASSERT(RW_WRITE_HELD(&dn->dn_struct_rwlock)); 1982ea8dc4b6Seschrock 1983ea8dc4b6Seschrock ASSERT(dn->dn_bonus == NULL); 19840a586ceaSMark Shellenbaum dn->dn_bonus = dbuf_create(dn, 0, DMU_BONUS_BLKID, dn->dn_dbuf, NULL); 19850a586ceaSMark Shellenbaum } 19860a586ceaSMark Shellenbaum 19870a586ceaSMark Shellenbaum int 19880a586ceaSMark Shellenbaum dbuf_spill_set_blksz(dmu_buf_t *db_fake, uint64_t blksz, dmu_tx_t *tx) 19890a586ceaSMark Shellenbaum { 19900a586ceaSMark Shellenbaum dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 1991744947dcSTom Erickson dnode_t *dn; 1992744947dcSTom Erickson 19930a586ceaSMark Shellenbaum if (db->db_blkid != DMU_SPILL_BLKID) 1994be6fd75aSMatthew Ahrens return (SET_ERROR(ENOTSUP)); 19950a586ceaSMark Shellenbaum if (blksz == 0) 19960a586ceaSMark Shellenbaum blksz = SPA_MINBLOCKSIZE; 19970a586ceaSMark Shellenbaum if (blksz > SPA_MAXBLOCKSIZE) 19980a586ceaSMark Shellenbaum blksz = SPA_MAXBLOCKSIZE; 19990a586ceaSMark Shellenbaum else 20000a586ceaSMark Shellenbaum blksz = P2ROUNDUP(blksz, SPA_MINBLOCKSIZE); 20010a586ceaSMark Shellenbaum 2002744947dcSTom Erickson DB_DNODE_ENTER(db); 2003744947dcSTom Erickson dn = DB_DNODE(db); 2004744947dcSTom Erickson rw_enter(&dn->dn_struct_rwlock, RW_WRITER); 20050a586ceaSMark Shellenbaum dbuf_new_size(db, blksz, tx); 2006744947dcSTom Erickson rw_exit(&dn->dn_struct_rwlock); 2007744947dcSTom Erickson DB_DNODE_EXIT(db); 20080a586ceaSMark Shellenbaum 20090a586ceaSMark Shellenbaum return (0); 20100a586ceaSMark Shellenbaum } 20110a586ceaSMark Shellenbaum 20120a586ceaSMark Shellenbaum void 20130a586ceaSMark Shellenbaum dbuf_rm_spill(dnode_t *dn, dmu_tx_t *tx) 20140a586ceaSMark Shellenbaum { 20150a586ceaSMark Shellenbaum dbuf_free_range(dn, DMU_SPILL_BLKID, DMU_SPILL_BLKID, tx); 2016fa9e4066Sahrens } 2017fa9e4066Sahrens 2018ea8dc4b6Seschrock #pragma weak dmu_buf_add_ref = dbuf_add_ref 2019fa9e4066Sahrens void 2020fa9e4066Sahrens dbuf_add_ref(dmu_buf_impl_t *db, void *tag) 2021fa9e4066Sahrens { 2022ea8dc4b6Seschrock int64_t holds = refcount_add(&db->db_holds, tag); 2023ea8dc4b6Seschrock ASSERT(holds > 1); 2024fa9e4066Sahrens } 2025fa9e4066Sahrens 2026744947dcSTom Erickson /* 2027744947dcSTom Erickson * If you call dbuf_rele() you had better not be referencing the dnode handle 2028744947dcSTom Erickson * unless you have some other direct or indirect hold on the dnode. (An indirect 2029744947dcSTom Erickson * hold is a hold on one of the dnode's dbufs, including the bonus buffer.) 2030744947dcSTom Erickson * Without that, the dbuf_rele() could lead to a dnode_rele() followed by the 2031744947dcSTom Erickson * dnode's parent dbuf evicting its dnode handles. 2032744947dcSTom Erickson */ 2033ea8dc4b6Seschrock #pragma weak dmu_buf_rele = dbuf_rele 2034fa9e4066Sahrens void 2035ea8dc4b6Seschrock dbuf_rele(dmu_buf_impl_t *db, void *tag) 2036fa9e4066Sahrens { 2037b24ab676SJeff Bonwick mutex_enter(&db->db_mtx); 2038b24ab676SJeff Bonwick dbuf_rele_and_unlock(db, tag); 2039b24ab676SJeff Bonwick } 2040b24ab676SJeff Bonwick 2041b24ab676SJeff Bonwick /* 2042b24ab676SJeff Bonwick * dbuf_rele() for an already-locked dbuf. This is necessary to allow 2043b24ab676SJeff Bonwick * db_dirtycnt and db_holds to be updated atomically. 2044b24ab676SJeff Bonwick */ 2045b24ab676SJeff Bonwick void 2046b24ab676SJeff Bonwick dbuf_rele_and_unlock(dmu_buf_impl_t *db, void *tag) 2047b24ab676SJeff Bonwick { 2048fa9e4066Sahrens int64_t holds; 2049fa9e4066Sahrens 2050b24ab676SJeff Bonwick ASSERT(MUTEX_HELD(&db->db_mtx)); 20519c9dc39aSek110237 DBUF_VERIFY(db); 2052fa9e4066Sahrens 2053744947dcSTom Erickson /* 2054744947dcSTom Erickson * Remove the reference to the dbuf before removing its hold on the 2055744947dcSTom Erickson * dnode so we can guarantee in dnode_move() that a referenced bonus 2056744947dcSTom Erickson * buffer has a corresponding dnode hold. 2057744947dcSTom Erickson */ 2058fa9e4066Sahrens holds = refcount_remove(&db->db_holds, tag); 2059ea8dc4b6Seschrock ASSERT(holds >= 0); 2060fa9e4066Sahrens 2061c717a561Smaybee /* 2062c717a561Smaybee * We can't freeze indirects if there is a possibility that they 2063c717a561Smaybee * may be modified in the current syncing context. 2064c717a561Smaybee */ 2065c717a561Smaybee if (db->db_buf && holds == (db->db_level == 0 ? db->db_dirtycnt : 0)) 20666b4acc8bSahrens arc_buf_freeze(db->db_buf); 20676b4acc8bSahrens 2068fa9e4066Sahrens if (holds == db->db_dirtycnt && 2069c717a561Smaybee db->db_level == 0 && db->db_immediate_evict) 2070fa9e4066Sahrens dbuf_evict_user(db); 2071ea8dc4b6Seschrock 2072ea8dc4b6Seschrock if (holds == 0) { 20730a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 2074ea8dc4b6Seschrock mutex_exit(&db->db_mtx); 2075744947dcSTom Erickson 2076744947dcSTom Erickson /* 2077744947dcSTom Erickson * If the dnode moves here, we cannot cross this barrier 2078744947dcSTom Erickson * until the move completes. 2079744947dcSTom Erickson */ 2080744947dcSTom Erickson DB_DNODE_ENTER(db); 2081744947dcSTom Erickson (void) atomic_dec_32_nv(&DB_DNODE(db)->dn_dbufs_count); 2082744947dcSTom Erickson DB_DNODE_EXIT(db); 2083744947dcSTom Erickson /* 2084744947dcSTom Erickson * The bonus buffer's dnode hold is no longer discounted 2085744947dcSTom Erickson * in dnode_move(). The dnode cannot move until after 2086744947dcSTom Erickson * the dnode_rele(). 2087744947dcSTom Erickson */ 2088744947dcSTom Erickson dnode_rele(DB_DNODE(db), db); 2089ea8dc4b6Seschrock } else if (db->db_buf == NULL) { 2090ea8dc4b6Seschrock /* 2091ea8dc4b6Seschrock * This is a special case: we never associated this 2092ea8dc4b6Seschrock * dbuf with any data allocated from the ARC. 2093ea8dc4b6Seschrock */ 209482c9918fSTim Haley ASSERT(db->db_state == DB_UNCACHED || 209582c9918fSTim Haley db->db_state == DB_NOFILL); 2096ea8dc4b6Seschrock dbuf_evict(db); 2097ea8dc4b6Seschrock } else if (arc_released(db->db_buf)) { 2098ea8dc4b6Seschrock arc_buf_t *buf = db->db_buf; 2099ea8dc4b6Seschrock /* 2100ea8dc4b6Seschrock * This dbuf has anonymous data associated with it. 2101ea8dc4b6Seschrock */ 2102ea8dc4b6Seschrock dbuf_set_data(db, NULL); 21033b2aab18SMatthew Ahrens VERIFY(arc_buf_remove_ref(buf, db)); 2104ea8dc4b6Seschrock dbuf_evict(db); 2105ea8dc4b6Seschrock } else { 21063b2aab18SMatthew Ahrens VERIFY(!arc_buf_remove_ref(db->db_buf, db)); 21079253d63dSGeorge Wilson 21089253d63dSGeorge Wilson /* 21099253d63dSGeorge Wilson * A dbuf will be eligible for eviction if either the 21109253d63dSGeorge Wilson * 'primarycache' property is set or a duplicate 21119253d63dSGeorge Wilson * copy of this buffer is already cached in the arc. 21129253d63dSGeorge Wilson * 21139253d63dSGeorge Wilson * In the case of the 'primarycache' a buffer 21149253d63dSGeorge Wilson * is considered for eviction if it matches the 21159253d63dSGeorge Wilson * criteria set in the property. 21169253d63dSGeorge Wilson * 21179253d63dSGeorge Wilson * To decide if our buffer is considered a 21189253d63dSGeorge Wilson * duplicate, we must call into the arc to determine 21199253d63dSGeorge Wilson * if multiple buffers are referencing the same 21209253d63dSGeorge Wilson * block on-disk. If so, then we simply evict 21219253d63dSGeorge Wilson * ourselves. 21229253d63dSGeorge Wilson */ 21239253d63dSGeorge Wilson if (!DBUF_IS_CACHEABLE(db) || 21249253d63dSGeorge Wilson arc_buf_eviction_needed(db->db_buf)) 21253baa08fcSek110237 dbuf_clear(db); 21263baa08fcSek110237 else 2127fa9e4066Sahrens mutex_exit(&db->db_mtx); 2128fa9e4066Sahrens } 2129ea8dc4b6Seschrock } else { 2130ea8dc4b6Seschrock mutex_exit(&db->db_mtx); 2131fa9e4066Sahrens } 2132fa9e4066Sahrens } 2133fa9e4066Sahrens 2134fa9e4066Sahrens #pragma weak dmu_buf_refcount = dbuf_refcount 2135fa9e4066Sahrens uint64_t 2136fa9e4066Sahrens dbuf_refcount(dmu_buf_impl_t *db) 2137fa9e4066Sahrens { 2138fa9e4066Sahrens return (refcount_count(&db->db_holds)); 2139fa9e4066Sahrens } 2140fa9e4066Sahrens 2141fa9e4066Sahrens void * 2142fa9e4066Sahrens dmu_buf_set_user(dmu_buf_t *db_fake, void *user_ptr, void *user_data_ptr_ptr, 2143fa9e4066Sahrens dmu_buf_evict_func_t *evict_func) 2144fa9e4066Sahrens { 2145fa9e4066Sahrens return (dmu_buf_update_user(db_fake, NULL, user_ptr, 2146fa9e4066Sahrens user_data_ptr_ptr, evict_func)); 2147fa9e4066Sahrens } 2148fa9e4066Sahrens 2149fa9e4066Sahrens void * 2150fa9e4066Sahrens dmu_buf_set_user_ie(dmu_buf_t *db_fake, void *user_ptr, void *user_data_ptr_ptr, 2151fa9e4066Sahrens dmu_buf_evict_func_t *evict_func) 2152fa9e4066Sahrens { 2153fa9e4066Sahrens dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 2154fa9e4066Sahrens 2155c717a561Smaybee db->db_immediate_evict = TRUE; 2156fa9e4066Sahrens return (dmu_buf_update_user(db_fake, NULL, user_ptr, 2157fa9e4066Sahrens user_data_ptr_ptr, evict_func)); 2158fa9e4066Sahrens } 2159fa9e4066Sahrens 2160fa9e4066Sahrens void * 2161fa9e4066Sahrens dmu_buf_update_user(dmu_buf_t *db_fake, void *old_user_ptr, void *user_ptr, 2162fa9e4066Sahrens void *user_data_ptr_ptr, dmu_buf_evict_func_t *evict_func) 2163fa9e4066Sahrens { 2164fa9e4066Sahrens dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 2165fa9e4066Sahrens ASSERT(db->db_level == 0); 2166fa9e4066Sahrens 2167fa9e4066Sahrens ASSERT((user_ptr == NULL) == (evict_func == NULL)); 2168fa9e4066Sahrens 2169fa9e4066Sahrens mutex_enter(&db->db_mtx); 2170fa9e4066Sahrens 2171c717a561Smaybee if (db->db_user_ptr == old_user_ptr) { 2172c717a561Smaybee db->db_user_ptr = user_ptr; 2173c717a561Smaybee db->db_user_data_ptr_ptr = user_data_ptr_ptr; 2174c717a561Smaybee db->db_evict_func = evict_func; 2175fa9e4066Sahrens 2176fa9e4066Sahrens dbuf_update_data(db); 2177fa9e4066Sahrens } else { 2178c717a561Smaybee old_user_ptr = db->db_user_ptr; 2179fa9e4066Sahrens } 2180fa9e4066Sahrens 2181fa9e4066Sahrens mutex_exit(&db->db_mtx); 2182fa9e4066Sahrens return (old_user_ptr); 2183fa9e4066Sahrens } 2184fa9e4066Sahrens 2185fa9e4066Sahrens void * 2186fa9e4066Sahrens dmu_buf_get_user(dmu_buf_t *db_fake) 2187fa9e4066Sahrens { 2188fa9e4066Sahrens dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 2189fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 2190fa9e4066Sahrens 2191c717a561Smaybee return (db->db_user_ptr); 2192fa9e4066Sahrens } 2193fa9e4066Sahrens 21943d692628SSanjeev Bagewadi boolean_t 21953d692628SSanjeev Bagewadi dmu_buf_freeable(dmu_buf_t *dbuf) 21963d692628SSanjeev Bagewadi { 21973d692628SSanjeev Bagewadi boolean_t res = B_FALSE; 21983d692628SSanjeev Bagewadi dmu_buf_impl_t *db = (dmu_buf_impl_t *)dbuf; 21993d692628SSanjeev Bagewadi 22003d692628SSanjeev Bagewadi if (db->db_blkptr) 22013d692628SSanjeev Bagewadi res = dsl_dataset_block_freeable(db->db_objset->os_dsl_dataset, 2202c7cd2421SGeorge Wilson db->db_blkptr, db->db_blkptr->blk_birth); 22033d692628SSanjeev Bagewadi 22043d692628SSanjeev Bagewadi return (res); 22053d692628SSanjeev Bagewadi } 22063d692628SSanjeev Bagewadi 220780901aeaSGeorge Wilson blkptr_t * 220880901aeaSGeorge Wilson dmu_buf_get_blkptr(dmu_buf_t *db) 220980901aeaSGeorge Wilson { 221080901aeaSGeorge Wilson dmu_buf_impl_t *dbi = (dmu_buf_impl_t *)db; 221180901aeaSGeorge Wilson return (dbi->db_blkptr); 221280901aeaSGeorge Wilson } 221380901aeaSGeorge Wilson 2214c717a561Smaybee static void 2215c717a561Smaybee dbuf_check_blkptr(dnode_t *dn, dmu_buf_impl_t *db) 2216fa9e4066Sahrens { 2217c717a561Smaybee /* ASSERT(dmu_tx_is_syncing(tx) */ 2218c717a561Smaybee ASSERT(MUTEX_HELD(&db->db_mtx)); 2219c717a561Smaybee 2220c717a561Smaybee if (db->db_blkptr != NULL) 2221c717a561Smaybee return; 2222c717a561Smaybee 22230a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) { 22240a586ceaSMark Shellenbaum db->db_blkptr = &dn->dn_phys->dn_spill; 22250a586ceaSMark Shellenbaum BP_ZERO(db->db_blkptr); 22260a586ceaSMark Shellenbaum return; 22270a586ceaSMark Shellenbaum } 2228c717a561Smaybee if (db->db_level == dn->dn_phys->dn_nlevels-1) { 2229c717a561Smaybee /* 2230c717a561Smaybee * This buffer was allocated at a time when there was 2231c717a561Smaybee * no available blkptrs from the dnode, or it was 2232c717a561Smaybee * inappropriate to hook it in (i.e., nlevels mis-match). 2233c717a561Smaybee */ 2234c717a561Smaybee ASSERT(db->db_blkid < dn->dn_phys->dn_nblkptr); 2235c717a561Smaybee ASSERT(db->db_parent == NULL); 2236c717a561Smaybee db->db_parent = dn->dn_dbuf; 2237c717a561Smaybee db->db_blkptr = &dn->dn_phys->dn_blkptr[db->db_blkid]; 2238c717a561Smaybee DBUF_VERIFY(db); 2239c717a561Smaybee } else { 2240c717a561Smaybee dmu_buf_impl_t *parent = db->db_parent; 2241c717a561Smaybee int epbs = dn->dn_phys->dn_indblkshift - SPA_BLKPTRSHIFT; 2242c717a561Smaybee 2243c717a561Smaybee ASSERT(dn->dn_phys->dn_nlevels > 1); 2244c717a561Smaybee if (parent == NULL) { 2245c717a561Smaybee mutex_exit(&db->db_mtx); 2246c717a561Smaybee rw_enter(&dn->dn_struct_rwlock, RW_READER); 2247c717a561Smaybee (void) dbuf_hold_impl(dn, db->db_level+1, 2248c717a561Smaybee db->db_blkid >> epbs, FALSE, db, &parent); 2249c717a561Smaybee rw_exit(&dn->dn_struct_rwlock); 2250c717a561Smaybee mutex_enter(&db->db_mtx); 2251c717a561Smaybee db->db_parent = parent; 2252c717a561Smaybee } 2253c717a561Smaybee db->db_blkptr = (blkptr_t *)parent->db.db_data + 2254c717a561Smaybee (db->db_blkid & ((1ULL << epbs) - 1)); 2255c717a561Smaybee DBUF_VERIFY(db); 2256c717a561Smaybee } 2257c717a561Smaybee } 2258c717a561Smaybee 2259c717a561Smaybee static void 2260c717a561Smaybee dbuf_sync_indirect(dbuf_dirty_record_t *dr, dmu_tx_t *tx) 2261c717a561Smaybee { 2262c717a561Smaybee dmu_buf_impl_t *db = dr->dr_dbuf; 2263744947dcSTom Erickson dnode_t *dn; 2264c717a561Smaybee zio_t *zio; 2265c717a561Smaybee 2266c717a561Smaybee ASSERT(dmu_tx_is_syncing(tx)); 2267c717a561Smaybee 2268c717a561Smaybee dprintf_dbuf_bp(db, db->db_blkptr, "blkptr=%p", db->db_blkptr); 2269c717a561Smaybee 2270c717a561Smaybee mutex_enter(&db->db_mtx); 2271c717a561Smaybee 2272c717a561Smaybee ASSERT(db->db_level > 0); 2273c717a561Smaybee DBUF_VERIFY(db); 2274c717a561Smaybee 22753e30c24aSWill Andrews /* Read the block if it hasn't been read yet. */ 2276c717a561Smaybee if (db->db_buf == NULL) { 2277c717a561Smaybee mutex_exit(&db->db_mtx); 2278c717a561Smaybee (void) dbuf_read(db, NULL, DB_RF_MUST_SUCCEED); 2279c717a561Smaybee mutex_enter(&db->db_mtx); 2280c717a561Smaybee } 2281c717a561Smaybee ASSERT3U(db->db_state, ==, DB_CACHED); 2282c717a561Smaybee ASSERT(db->db_buf != NULL); 2283c717a561Smaybee 2284744947dcSTom Erickson DB_DNODE_ENTER(db); 2285744947dcSTom Erickson dn = DB_DNODE(db); 22863e30c24aSWill Andrews /* Indirect block size must match what the dnode thinks it is. */ 2287744947dcSTom Erickson ASSERT3U(db->db.db_size, ==, 1<<dn->dn_phys->dn_indblkshift); 2288c717a561Smaybee dbuf_check_blkptr(dn, db); 2289744947dcSTom Erickson DB_DNODE_EXIT(db); 2290c717a561Smaybee 22913e30c24aSWill Andrews /* Provide the pending dirty record to child dbufs */ 2292c717a561Smaybee db->db_data_pending = dr; 2293c717a561Smaybee 2294af2c4821Smaybee mutex_exit(&db->db_mtx); 2295088f3894Sahrens dbuf_write(dr, db->db_buf, tx); 2296c717a561Smaybee 2297c717a561Smaybee zio = dr->dr_zio; 2298c717a561Smaybee mutex_enter(&dr->dt.di.dr_mtx); 2299c717a561Smaybee dbuf_sync_list(&dr->dt.di.dr_children, tx); 2300c717a561Smaybee ASSERT(list_head(&dr->dt.di.dr_children) == NULL); 2301c717a561Smaybee mutex_exit(&dr->dt.di.dr_mtx); 2302c717a561Smaybee zio_nowait(zio); 2303c717a561Smaybee } 2304c717a561Smaybee 2305c717a561Smaybee static void 2306c717a561Smaybee dbuf_sync_leaf(dbuf_dirty_record_t *dr, dmu_tx_t *tx) 2307c717a561Smaybee { 2308c717a561Smaybee arc_buf_t **datap = &dr->dt.dl.dr_data; 2309c717a561Smaybee dmu_buf_impl_t *db = dr->dr_dbuf; 2310744947dcSTom Erickson dnode_t *dn; 2311744947dcSTom Erickson objset_t *os; 2312c717a561Smaybee uint64_t txg = tx->tx_txg; 2313fa9e4066Sahrens 2314fa9e4066Sahrens ASSERT(dmu_tx_is_syncing(tx)); 2315fa9e4066Sahrens 2316fa9e4066Sahrens dprintf_dbuf_bp(db, db->db_blkptr, "blkptr=%p", db->db_blkptr); 2317fa9e4066Sahrens 2318fa9e4066Sahrens mutex_enter(&db->db_mtx); 2319fa9e4066Sahrens /* 2320fa9e4066Sahrens * To be synced, we must be dirtied. But we 2321fa9e4066Sahrens * might have been freed after the dirty. 2322fa9e4066Sahrens */ 2323fa9e4066Sahrens if (db->db_state == DB_UNCACHED) { 2324fa9e4066Sahrens /* This buffer has been freed since it was dirtied */ 2325fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 2326fa9e4066Sahrens } else if (db->db_state == DB_FILL) { 2327fa9e4066Sahrens /* This buffer was freed and is now being re-filled */ 2328c717a561Smaybee ASSERT(db->db.db_data != dr->dt.dl.dr_data); 2329fa9e4066Sahrens } else { 233082c9918fSTim Haley ASSERT(db->db_state == DB_CACHED || db->db_state == DB_NOFILL); 2331fa9e4066Sahrens } 23329c9dc39aSek110237 DBUF_VERIFY(db); 2333fa9e4066Sahrens 2334744947dcSTom Erickson DB_DNODE_ENTER(db); 2335744947dcSTom Erickson dn = DB_DNODE(db); 2336744947dcSTom Erickson 23370a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) { 23380a586ceaSMark Shellenbaum mutex_enter(&dn->dn_mtx); 23390a586ceaSMark Shellenbaum dn->dn_phys->dn_flags |= DNODE_FLAG_SPILL_BLKPTR; 23400a586ceaSMark Shellenbaum mutex_exit(&dn->dn_mtx); 23410a586ceaSMark Shellenbaum } 23420a586ceaSMark Shellenbaum 2343fa9e4066Sahrens /* 2344c717a561Smaybee * If this is a bonus buffer, simply copy the bonus data into the 2345c717a561Smaybee * dnode. It will be written out when the dnode is synced (and it 2346c717a561Smaybee * will be synced, since it must have been dirty for dbuf_sync to 2347c717a561Smaybee * be called). 2348fa9e4066Sahrens */ 23490a586ceaSMark Shellenbaum if (db->db_blkid == DMU_BONUS_BLKID) { 2350c717a561Smaybee dbuf_dirty_record_t **drp; 23511934e92fSmaybee 2352ea8dc4b6Seschrock ASSERT(*datap != NULL); 2353fb09f5aaSMadhav Suresh ASSERT0(db->db_level); 2354ea8dc4b6Seschrock ASSERT3U(dn->dn_phys->dn_bonuslen, <=, DN_MAX_BONUSLEN); 2355ea8dc4b6Seschrock bcopy(*datap, DN_BONUS(dn->dn_phys), dn->dn_phys->dn_bonuslen); 2356744947dcSTom Erickson DB_DNODE_EXIT(db); 2357744947dcSTom Erickson 23580e8c6158Smaybee if (*datap != db->db.db_data) { 2359ea8dc4b6Seschrock zio_buf_free(*datap, DN_MAX_BONUSLEN); 23605a98e54bSBrendan Gregg - Sun Microsystems arc_space_return(DN_MAX_BONUSLEN, ARC_SPACE_OTHER); 23610e8c6158Smaybee } 2362ea8dc4b6Seschrock db->db_data_pending = NULL; 2363c717a561Smaybee drp = &db->db_last_dirty; 2364c717a561Smaybee while (*drp != dr) 2365c717a561Smaybee drp = &(*drp)->dr_next; 236617f17c2dSbonwick ASSERT(dr->dr_next == NULL); 2367b24ab676SJeff Bonwick ASSERT(dr->dr_dbuf == db); 236817f17c2dSbonwick *drp = dr->dr_next; 2369c717a561Smaybee kmem_free(dr, sizeof (dbuf_dirty_record_t)); 2370ea8dc4b6Seschrock ASSERT(db->db_dirtycnt > 0); 2371ea8dc4b6Seschrock db->db_dirtycnt -= 1; 2372b24ab676SJeff Bonwick dbuf_rele_and_unlock(db, (void *)(uintptr_t)txg); 2373ea8dc4b6Seschrock return; 2374ea8dc4b6Seschrock } 2375ea8dc4b6Seschrock 2376744947dcSTom Erickson os = dn->dn_objset; 2377744947dcSTom Erickson 2378c5c6ffa0Smaybee /* 2379f82bfe17Sgw25295 * This function may have dropped the db_mtx lock allowing a dmu_sync 2380f82bfe17Sgw25295 * operation to sneak in. As a result, we need to ensure that we 2381f82bfe17Sgw25295 * don't check the dr_override_state until we have returned from 2382f82bfe17Sgw25295 * dbuf_check_blkptr. 2383f82bfe17Sgw25295 */ 2384f82bfe17Sgw25295 dbuf_check_blkptr(dn, db); 2385f82bfe17Sgw25295 2386f82bfe17Sgw25295 /* 2387744947dcSTom Erickson * If this buffer is in the middle of an immediate write, 2388c717a561Smaybee * wait for the synchronous IO to complete. 2389c5c6ffa0Smaybee */ 2390c717a561Smaybee while (dr->dt.dl.dr_override_state == DR_IN_DMU_SYNC) { 2391c5c6ffa0Smaybee ASSERT(dn->dn_object != DMU_META_DNODE_OBJECT); 2392c5c6ffa0Smaybee cv_wait(&db->db_changed, &db->db_mtx); 2393c717a561Smaybee ASSERT(dr->dt.dl.dr_override_state != DR_NOT_OVERRIDDEN); 2394c5c6ffa0Smaybee } 2395c717a561Smaybee 2396ab69d62fSMatthew Ahrens if (db->db_state != DB_NOFILL && 2397ab69d62fSMatthew Ahrens dn->dn_object != DMU_META_DNODE_OBJECT && 2398ab69d62fSMatthew Ahrens refcount_count(&db->db_holds) > 1 && 2399b24ab676SJeff Bonwick dr->dt.dl.dr_override_state != DR_OVERRIDDEN && 2400ab69d62fSMatthew Ahrens *datap == db->db_buf) { 2401fa9e4066Sahrens /* 240282c9918fSTim Haley * If this buffer is currently "in use" (i.e., there 240382c9918fSTim Haley * are active holds and db_data still references it), 240482c9918fSTim Haley * then make a copy before we start the write so that 240582c9918fSTim Haley * any modifications from the open txg will not leak 240682c9918fSTim Haley * into this write. 2407fa9e4066Sahrens * 240882c9918fSTim Haley * NOTE: this copy does not need to be made for 240982c9918fSTim Haley * objects only modified in the syncing context (e.g. 241082c9918fSTim Haley * DNONE_DNODE blocks). 2411fa9e4066Sahrens */ 2412ab69d62fSMatthew Ahrens int blksz = arc_buf_size(*datap); 2413ab69d62fSMatthew Ahrens arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 2414ab69d62fSMatthew Ahrens *datap = arc_buf_alloc(os->os_spa, blksz, db, type); 2415c717a561Smaybee bcopy(db->db.db_data, (*datap)->b_data, blksz); 2416fa9e4066Sahrens } 2417c717a561Smaybee db->db_data_pending = dr; 2418fa9e4066Sahrens 2419fa9e4066Sahrens mutex_exit(&db->db_mtx); 2420fa9e4066Sahrens 2421088f3894Sahrens dbuf_write(dr, *datap, tx); 2422c717a561Smaybee 2423c717a561Smaybee ASSERT(!list_link_active(&dr->dr_dirty_node)); 2424744947dcSTom Erickson if (dn->dn_object == DMU_META_DNODE_OBJECT) { 2425c717a561Smaybee list_insert_tail(&dn->dn_dirty_records[txg&TXG_MASK], dr); 2426744947dcSTom Erickson DB_DNODE_EXIT(db); 2427744947dcSTom Erickson } else { 2428744947dcSTom Erickson /* 2429744947dcSTom Erickson * Although zio_nowait() does not "wait for an IO", it does 2430744947dcSTom Erickson * initiate the IO. If this is an empty write it seems plausible 2431744947dcSTom Erickson * that the IO could actually be completed before the nowait 2432744947dcSTom Erickson * returns. We need to DB_DNODE_EXIT() first in case 2433744947dcSTom Erickson * zio_nowait() invalidates the dbuf. 2434744947dcSTom Erickson */ 2435744947dcSTom Erickson DB_DNODE_EXIT(db); 2436c717a561Smaybee zio_nowait(dr->dr_zio); 2437fa9e4066Sahrens } 2438744947dcSTom Erickson } 2439c717a561Smaybee 2440c717a561Smaybee void 2441c717a561Smaybee dbuf_sync_list(list_t *list, dmu_tx_t *tx) 2442c717a561Smaybee { 2443c717a561Smaybee dbuf_dirty_record_t *dr; 2444c717a561Smaybee 2445c717a561Smaybee while (dr = list_head(list)) { 2446c717a561Smaybee if (dr->dr_zio != NULL) { 2447c717a561Smaybee /* 2448c717a561Smaybee * If we find an already initialized zio then we 2449c717a561Smaybee * are processing the meta-dnode, and we have finished. 2450c717a561Smaybee * The dbufs for all dnodes are put back on the list 2451c717a561Smaybee * during processing, so that we can zio_wait() 2452c717a561Smaybee * these IOs after initiating all child IOs. 2453c717a561Smaybee */ 2454c717a561Smaybee ASSERT3U(dr->dr_dbuf->db.db_object, ==, 2455c717a561Smaybee DMU_META_DNODE_OBJECT); 2456c717a561Smaybee break; 2457fa9e4066Sahrens } 2458c717a561Smaybee list_remove(list, dr); 2459c717a561Smaybee if (dr->dr_dbuf->db_level > 0) 2460c717a561Smaybee dbuf_sync_indirect(dr, tx); 2461c717a561Smaybee else 2462c717a561Smaybee dbuf_sync_leaf(dr, tx); 2463c717a561Smaybee } 2464c717a561Smaybee } 2465c717a561Smaybee 2466fa9e4066Sahrens /* ARGSUSED */ 2467fa9e4066Sahrens static void 2468c717a561Smaybee dbuf_write_ready(zio_t *zio, arc_buf_t *buf, void *vdb) 2469fa9e4066Sahrens { 2470fa9e4066Sahrens dmu_buf_impl_t *db = vdb; 2471744947dcSTom Erickson dnode_t *dn; 2472e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 2473c717a561Smaybee blkptr_t *bp_orig = &zio->io_bp_orig; 2474b24ab676SJeff Bonwick spa_t *spa = zio->io_spa; 2475b24ab676SJeff Bonwick int64_t delta; 2476fa9e4066Sahrens uint64_t fill = 0; 2477b24ab676SJeff Bonwick int i; 2478fa9e4066Sahrens 2479e14bb325SJeff Bonwick ASSERT(db->db_blkptr == bp); 2480e14bb325SJeff Bonwick 2481744947dcSTom Erickson DB_DNODE_ENTER(db); 2482744947dcSTom Erickson dn = DB_DNODE(db); 2483b24ab676SJeff Bonwick delta = bp_get_dsize_sync(spa, bp) - bp_get_dsize_sync(spa, bp_orig); 2484b24ab676SJeff Bonwick dnode_diduse_space(dn, delta - zio->io_prev_space_delta); 2485b24ab676SJeff Bonwick zio->io_prev_space_delta = delta; 2486fa9e4066Sahrens 2487e14bb325SJeff Bonwick if (BP_IS_HOLE(bp)) { 2488b24ab676SJeff Bonwick ASSERT(bp->blk_fill == 0); 2489744947dcSTom Erickson DB_DNODE_EXIT(db); 2490c717a561Smaybee return; 2491c717a561Smaybee } 2492c717a561Smaybee 24930a586ceaSMark Shellenbaum ASSERT((db->db_blkid != DMU_SPILL_BLKID && 24940a586ceaSMark Shellenbaum BP_GET_TYPE(bp) == dn->dn_type) || 24950a586ceaSMark Shellenbaum (db->db_blkid == DMU_SPILL_BLKID && 24960a586ceaSMark Shellenbaum BP_GET_TYPE(bp) == dn->dn_bonustype)); 2497e14bb325SJeff Bonwick ASSERT(BP_GET_LEVEL(bp) == db->db_level); 2498e14bb325SJeff Bonwick 2499fa9e4066Sahrens mutex_enter(&db->db_mtx); 2500fa9e4066Sahrens 25010a586ceaSMark Shellenbaum #ifdef ZFS_DEBUG 25020a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) { 25030a586ceaSMark Shellenbaum ASSERT(dn->dn_phys->dn_flags & DNODE_FLAG_SPILL_BLKPTR); 25040a586ceaSMark Shellenbaum ASSERT(!(BP_IS_HOLE(db->db_blkptr)) && 25050a586ceaSMark Shellenbaum db->db_blkptr == &dn->dn_phys->dn_spill); 25060a586ceaSMark Shellenbaum } 25070a586ceaSMark Shellenbaum #endif 25080a586ceaSMark Shellenbaum 2509fa9e4066Sahrens if (db->db_level == 0) { 2510fa9e4066Sahrens mutex_enter(&dn->dn_mtx); 25110a586ceaSMark Shellenbaum if (db->db_blkid > dn->dn_phys->dn_maxblkid && 25120a586ceaSMark Shellenbaum db->db_blkid != DMU_SPILL_BLKID) 2513fa9e4066Sahrens dn->dn_phys->dn_maxblkid = db->db_blkid; 2514fa9e4066Sahrens mutex_exit(&dn->dn_mtx); 2515fa9e4066Sahrens 2516fa9e4066Sahrens if (dn->dn_type == DMU_OT_DNODE) { 2517fa9e4066Sahrens dnode_phys_t *dnp = db->db.db_data; 2518fa9e4066Sahrens for (i = db->db.db_size >> DNODE_SHIFT; i > 0; 2519fa9e4066Sahrens i--, dnp++) { 2520fa9e4066Sahrens if (dnp->dn_type != DMU_OT_NONE) 2521fa9e4066Sahrens fill++; 2522fa9e4066Sahrens } 2523fa9e4066Sahrens } else { 2524fa9e4066Sahrens fill = 1; 2525fa9e4066Sahrens } 2526fa9e4066Sahrens } else { 2527e14bb325SJeff Bonwick blkptr_t *ibp = db->db.db_data; 2528fa9e4066Sahrens ASSERT3U(db->db.db_size, ==, 1<<dn->dn_phys->dn_indblkshift); 2529e14bb325SJeff Bonwick for (i = db->db.db_size >> SPA_BLKPTRSHIFT; i > 0; i--, ibp++) { 2530e14bb325SJeff Bonwick if (BP_IS_HOLE(ibp)) 2531fa9e4066Sahrens continue; 2532e14bb325SJeff Bonwick fill += ibp->blk_fill; 2533fa9e4066Sahrens } 2534fa9e4066Sahrens } 2535744947dcSTom Erickson DB_DNODE_EXIT(db); 2536fa9e4066Sahrens 2537e14bb325SJeff Bonwick bp->blk_fill = fill; 2538fa9e4066Sahrens 2539fa9e4066Sahrens mutex_exit(&db->db_mtx); 2540fa9e4066Sahrens } 2541fa9e4066Sahrens 2542*69962b56SMatthew Ahrens /* 2543*69962b56SMatthew Ahrens * The SPA will call this callback several times for each zio - once 2544*69962b56SMatthew Ahrens * for every physical child i/o (zio->io_phys_children times). This 2545*69962b56SMatthew Ahrens * allows the DMU to monitor the progress of each logical i/o. For example, 2546*69962b56SMatthew Ahrens * there may be 2 copies of an indirect block, or many fragments of a RAID-Z 2547*69962b56SMatthew Ahrens * block. There may be a long delay before all copies/fragments are completed, 2548*69962b56SMatthew Ahrens * so this callback allows us to retire dirty space gradually, as the physical 2549*69962b56SMatthew Ahrens * i/os complete. 2550*69962b56SMatthew Ahrens */ 2551*69962b56SMatthew Ahrens /* ARGSUSED */ 2552*69962b56SMatthew Ahrens static void 2553*69962b56SMatthew Ahrens dbuf_write_physdone(zio_t *zio, arc_buf_t *buf, void *arg) 2554*69962b56SMatthew Ahrens { 2555*69962b56SMatthew Ahrens dmu_buf_impl_t *db = arg; 2556*69962b56SMatthew Ahrens objset_t *os = db->db_objset; 2557*69962b56SMatthew Ahrens dsl_pool_t *dp = dmu_objset_pool(os); 2558*69962b56SMatthew Ahrens dbuf_dirty_record_t *dr; 2559*69962b56SMatthew Ahrens int delta = 0; 2560*69962b56SMatthew Ahrens 2561*69962b56SMatthew Ahrens dr = db->db_data_pending; 2562*69962b56SMatthew Ahrens ASSERT3U(dr->dr_txg, ==, zio->io_txg); 2563*69962b56SMatthew Ahrens 2564*69962b56SMatthew Ahrens /* 2565*69962b56SMatthew Ahrens * The callback will be called io_phys_children times. Retire one 2566*69962b56SMatthew Ahrens * portion of our dirty space each time we are called. Any rounding 2567*69962b56SMatthew Ahrens * error will be cleaned up by dsl_pool_sync()'s call to 2568*69962b56SMatthew Ahrens * dsl_pool_undirty_space(). 2569*69962b56SMatthew Ahrens */ 2570*69962b56SMatthew Ahrens delta = dr->dr_accounted / zio->io_phys_children; 2571*69962b56SMatthew Ahrens dsl_pool_undirty_space(dp, delta, zio->io_txg); 2572*69962b56SMatthew Ahrens } 2573*69962b56SMatthew Ahrens 2574c717a561Smaybee /* ARGSUSED */ 2575c717a561Smaybee static void 2576c717a561Smaybee dbuf_write_done(zio_t *zio, arc_buf_t *buf, void *vdb) 2577c717a561Smaybee { 2578c717a561Smaybee dmu_buf_impl_t *db = vdb; 2579b24ab676SJeff Bonwick blkptr_t *bp = zio->io_bp; 2580b24ab676SJeff Bonwick blkptr_t *bp_orig = &zio->io_bp_orig; 2581c717a561Smaybee uint64_t txg = zio->io_txg; 2582c717a561Smaybee dbuf_dirty_record_t **drp, *dr; 2583c717a561Smaybee 2584fb09f5aaSMadhav Suresh ASSERT0(zio->io_error); 2585b24ab676SJeff Bonwick ASSERT(db->db_blkptr == bp); 2586b24ab676SJeff Bonwick 258780901aeaSGeorge Wilson /* 258880901aeaSGeorge Wilson * For nopwrites and rewrites we ensure that the bp matches our 258980901aeaSGeorge Wilson * original and bypass all the accounting. 259080901aeaSGeorge Wilson */ 259180901aeaSGeorge Wilson if (zio->io_flags & (ZIO_FLAG_IO_REWRITE | ZIO_FLAG_NOPWRITE)) { 2592b24ab676SJeff Bonwick ASSERT(BP_EQUAL(bp, bp_orig)); 2593b24ab676SJeff Bonwick } else { 2594744947dcSTom Erickson objset_t *os; 2595744947dcSTom Erickson dsl_dataset_t *ds; 2596744947dcSTom Erickson dmu_tx_t *tx; 2597744947dcSTom Erickson 2598744947dcSTom Erickson DB_GET_OBJSET(&os, db); 2599744947dcSTom Erickson ds = os->os_dsl_dataset; 2600744947dcSTom Erickson tx = os->os_synctx; 2601b24ab676SJeff Bonwick 2602b24ab676SJeff Bonwick (void) dsl_dataset_block_kill(ds, bp_orig, tx, B_TRUE); 2603b24ab676SJeff Bonwick dsl_dataset_block_born(ds, bp, tx); 2604b24ab676SJeff Bonwick } 2605c717a561Smaybee 2606c717a561Smaybee mutex_enter(&db->db_mtx); 2607c717a561Smaybee 2608b24ab676SJeff Bonwick DBUF_VERIFY(db); 2609b24ab676SJeff Bonwick 2610c717a561Smaybee drp = &db->db_last_dirty; 261117f17c2dSbonwick while ((dr = *drp) != db->db_data_pending) 261217f17c2dSbonwick drp = &dr->dr_next; 261317f17c2dSbonwick ASSERT(!list_link_active(&dr->dr_dirty_node)); 261417f17c2dSbonwick ASSERT(dr->dr_txg == txg); 2615b24ab676SJeff Bonwick ASSERT(dr->dr_dbuf == db); 261617f17c2dSbonwick ASSERT(dr->dr_next == NULL); 261717f17c2dSbonwick *drp = dr->dr_next; 2618c717a561Smaybee 26190a586ceaSMark Shellenbaum #ifdef ZFS_DEBUG 26200a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) { 2621744947dcSTom Erickson dnode_t *dn; 2622744947dcSTom Erickson 2623744947dcSTom Erickson DB_DNODE_ENTER(db); 2624744947dcSTom Erickson dn = DB_DNODE(db); 26250a586ceaSMark Shellenbaum ASSERT(dn->dn_phys->dn_flags & DNODE_FLAG_SPILL_BLKPTR); 26260a586ceaSMark Shellenbaum ASSERT(!(BP_IS_HOLE(db->db_blkptr)) && 26270a586ceaSMark Shellenbaum db->db_blkptr == &dn->dn_phys->dn_spill); 2628744947dcSTom Erickson DB_DNODE_EXIT(db); 26290a586ceaSMark Shellenbaum } 26300a586ceaSMark Shellenbaum #endif 26310a586ceaSMark Shellenbaum 2632c717a561Smaybee if (db->db_level == 0) { 26330a586ceaSMark Shellenbaum ASSERT(db->db_blkid != DMU_BONUS_BLKID); 2634c717a561Smaybee ASSERT(dr->dt.dl.dr_override_state == DR_NOT_OVERRIDDEN); 263582c9918fSTim Haley if (db->db_state != DB_NOFILL) { 2636c717a561Smaybee if (dr->dt.dl.dr_data != db->db_buf) 263782c9918fSTim Haley VERIFY(arc_buf_remove_ref(dr->dt.dl.dr_data, 26383b2aab18SMatthew Ahrens db)); 2639b24ab676SJeff Bonwick else if (!arc_released(db->db_buf)) 2640c717a561Smaybee arc_set_callback(db->db_buf, dbuf_do_evict, db); 264182c9918fSTim Haley } 2642c717a561Smaybee } else { 2643744947dcSTom Erickson dnode_t *dn; 2644744947dcSTom Erickson 2645744947dcSTom Erickson DB_DNODE_ENTER(db); 2646744947dcSTom Erickson dn = DB_DNODE(db); 2647c717a561Smaybee ASSERT(list_head(&dr->dt.di.dr_children) == NULL); 2648c717a561Smaybee ASSERT3U(db->db.db_size, ==, 1<<dn->dn_phys->dn_indblkshift); 2649c717a561Smaybee if (!BP_IS_HOLE(db->db_blkptr)) { 2650c717a561Smaybee int epbs = 2651c717a561Smaybee dn->dn_phys->dn_indblkshift - SPA_BLKPTRSHIFT; 2652c717a561Smaybee ASSERT3U(BP_GET_LSIZE(db->db_blkptr), ==, 2653c717a561Smaybee db->db.db_size); 2654c717a561Smaybee ASSERT3U(dn->dn_phys->dn_maxblkid 2655c717a561Smaybee >> (db->db_level * epbs), >=, db->db_blkid); 2656c717a561Smaybee arc_set_callback(db->db_buf, dbuf_do_evict, db); 2657c717a561Smaybee } 2658744947dcSTom Erickson DB_DNODE_EXIT(db); 2659c25056deSgw25295 mutex_destroy(&dr->dt.di.dr_mtx); 2660c25056deSgw25295 list_destroy(&dr->dt.di.dr_children); 2661c717a561Smaybee } 2662c717a561Smaybee kmem_free(dr, sizeof (dbuf_dirty_record_t)); 2663c717a561Smaybee 2664c717a561Smaybee cv_broadcast(&db->db_changed); 2665c717a561Smaybee ASSERT(db->db_dirtycnt > 0); 2666c717a561Smaybee db->db_dirtycnt -= 1; 2667c717a561Smaybee db->db_data_pending = NULL; 2668*69962b56SMatthew Ahrens 2669b24ab676SJeff Bonwick dbuf_rele_and_unlock(db, (void *)(uintptr_t)txg); 2670b24ab676SJeff Bonwick } 2671b24ab676SJeff Bonwick 2672b24ab676SJeff Bonwick static void 2673b24ab676SJeff Bonwick dbuf_write_nofill_ready(zio_t *zio) 2674b24ab676SJeff Bonwick { 2675b24ab676SJeff Bonwick dbuf_write_ready(zio, NULL, zio->io_private); 2676b24ab676SJeff Bonwick } 2677b24ab676SJeff Bonwick 2678b24ab676SJeff Bonwick static void 2679b24ab676SJeff Bonwick dbuf_write_nofill_done(zio_t *zio) 2680b24ab676SJeff Bonwick { 2681b24ab676SJeff Bonwick dbuf_write_done(zio, NULL, zio->io_private); 2682b24ab676SJeff Bonwick } 2683b24ab676SJeff Bonwick 2684b24ab676SJeff Bonwick static void 2685b24ab676SJeff Bonwick dbuf_write_override_ready(zio_t *zio) 2686b24ab676SJeff Bonwick { 2687b24ab676SJeff Bonwick dbuf_dirty_record_t *dr = zio->io_private; 2688b24ab676SJeff Bonwick dmu_buf_impl_t *db = dr->dr_dbuf; 2689b24ab676SJeff Bonwick 2690b24ab676SJeff Bonwick dbuf_write_ready(zio, NULL, db); 2691b24ab676SJeff Bonwick } 2692b24ab676SJeff Bonwick 2693b24ab676SJeff Bonwick static void 2694b24ab676SJeff Bonwick dbuf_write_override_done(zio_t *zio) 2695b24ab676SJeff Bonwick { 2696b24ab676SJeff Bonwick dbuf_dirty_record_t *dr = zio->io_private; 2697b24ab676SJeff Bonwick dmu_buf_impl_t *db = dr->dr_dbuf; 2698b24ab676SJeff Bonwick blkptr_t *obp = &dr->dt.dl.dr_overridden_by; 2699b24ab676SJeff Bonwick 2700b24ab676SJeff Bonwick mutex_enter(&db->db_mtx); 2701b24ab676SJeff Bonwick if (!BP_EQUAL(zio->io_bp, obp)) { 2702b24ab676SJeff Bonwick if (!BP_IS_HOLE(obp)) 2703b24ab676SJeff Bonwick dsl_free(spa_get_dsl(zio->io_spa), zio->io_txg, obp); 2704b24ab676SJeff Bonwick arc_release(dr->dt.dl.dr_data, db); 2705b24ab676SJeff Bonwick } 2706c717a561Smaybee mutex_exit(&db->db_mtx); 2707c717a561Smaybee 2708b24ab676SJeff Bonwick dbuf_write_done(zio, NULL, db); 2709b24ab676SJeff Bonwick } 2710c717a561Smaybee 27113e30c24aSWill Andrews /* Issue I/O to commit a dirty buffer to disk. */ 2712b24ab676SJeff Bonwick static void 2713b24ab676SJeff Bonwick dbuf_write(dbuf_dirty_record_t *dr, arc_buf_t *data, dmu_tx_t *tx) 2714b24ab676SJeff Bonwick { 2715b24ab676SJeff Bonwick dmu_buf_impl_t *db = dr->dr_dbuf; 2716744947dcSTom Erickson dnode_t *dn; 2717744947dcSTom Erickson objset_t *os; 2718b24ab676SJeff Bonwick dmu_buf_impl_t *parent = db->db_parent; 2719b24ab676SJeff Bonwick uint64_t txg = tx->tx_txg; 2720b24ab676SJeff Bonwick zbookmark_t zb; 2721b24ab676SJeff Bonwick zio_prop_t zp; 2722b24ab676SJeff Bonwick zio_t *zio; 27230a586ceaSMark Shellenbaum int wp_flag = 0; 2724b24ab676SJeff Bonwick 2725744947dcSTom Erickson DB_DNODE_ENTER(db); 2726744947dcSTom Erickson dn = DB_DNODE(db); 2727744947dcSTom Erickson os = dn->dn_objset; 2728744947dcSTom Erickson 2729b24ab676SJeff Bonwick if (db->db_state != DB_NOFILL) { 2730b24ab676SJeff Bonwick if (db->db_level > 0 || dn->dn_type == DMU_OT_DNODE) { 2731b24ab676SJeff Bonwick /* 2732b24ab676SJeff Bonwick * Private object buffers are released here rather 2733b24ab676SJeff Bonwick * than in dbuf_dirty() since they are only modified 2734b24ab676SJeff Bonwick * in the syncing context and we don't want the 2735b24ab676SJeff Bonwick * overhead of making multiple copies of the data. 2736b24ab676SJeff Bonwick */ 2737b24ab676SJeff Bonwick if (BP_IS_HOLE(db->db_blkptr)) { 2738b24ab676SJeff Bonwick arc_buf_thaw(data); 2739b24ab676SJeff Bonwick } else { 27403f9d6ad7SLin Ling dbuf_release_bp(db); 2741b24ab676SJeff Bonwick } 2742b24ab676SJeff Bonwick } 2743b24ab676SJeff Bonwick } 2744b24ab676SJeff Bonwick 2745b24ab676SJeff Bonwick if (parent != dn->dn_dbuf) { 27463e30c24aSWill Andrews /* Our parent is an indirect block. */ 27473e30c24aSWill Andrews /* We have a dirty parent that has been scheduled for write. */ 2748b24ab676SJeff Bonwick ASSERT(parent && parent->db_data_pending); 27493e30c24aSWill Andrews /* Our parent's buffer is one level closer to the dnode. */ 2750b24ab676SJeff Bonwick ASSERT(db->db_level == parent->db_level-1); 27513e30c24aSWill Andrews /* 27523e30c24aSWill Andrews * We're about to modify our parent's db_data by modifying 27533e30c24aSWill Andrews * our block pointer, so the parent must be released. 27543e30c24aSWill Andrews */ 2755b24ab676SJeff Bonwick ASSERT(arc_released(parent->db_buf)); 2756b24ab676SJeff Bonwick zio = parent->db_data_pending->dr_zio; 2757b24ab676SJeff Bonwick } else { 27583e30c24aSWill Andrews /* Our parent is the dnode itself. */ 27590a586ceaSMark Shellenbaum ASSERT((db->db_level == dn->dn_phys->dn_nlevels-1 && 27600a586ceaSMark Shellenbaum db->db_blkid != DMU_SPILL_BLKID) || 27610a586ceaSMark Shellenbaum (db->db_blkid == DMU_SPILL_BLKID && db->db_level == 0)); 27620a586ceaSMark Shellenbaum if (db->db_blkid != DMU_SPILL_BLKID) 2763b24ab676SJeff Bonwick ASSERT3P(db->db_blkptr, ==, 2764b24ab676SJeff Bonwick &dn->dn_phys->dn_blkptr[db->db_blkid]); 2765b24ab676SJeff Bonwick zio = dn->dn_zio; 2766b24ab676SJeff Bonwick } 2767b24ab676SJeff Bonwick 2768b24ab676SJeff Bonwick ASSERT(db->db_level == 0 || data == db->db_buf); 2769b24ab676SJeff Bonwick ASSERT3U(db->db_blkptr->blk_birth, <=, txg); 2770b24ab676SJeff Bonwick ASSERT(zio); 2771b24ab676SJeff Bonwick 2772b24ab676SJeff Bonwick SET_BOOKMARK(&zb, os->os_dsl_dataset ? 2773b24ab676SJeff Bonwick os->os_dsl_dataset->ds_object : DMU_META_OBJSET, 2774b24ab676SJeff Bonwick db->db.db_object, db->db_level, db->db_blkid); 2775b24ab676SJeff Bonwick 27760a586ceaSMark Shellenbaum if (db->db_blkid == DMU_SPILL_BLKID) 27770a586ceaSMark Shellenbaum wp_flag = WP_SPILL; 27780a586ceaSMark Shellenbaum wp_flag |= (db->db_state == DB_NOFILL) ? WP_NOFILL : 0; 27790a586ceaSMark Shellenbaum 27800a586ceaSMark Shellenbaum dmu_write_policy(os, dn, db->db_level, wp_flag, &zp); 2781744947dcSTom Erickson DB_DNODE_EXIT(db); 2782b24ab676SJeff Bonwick 2783b24ab676SJeff Bonwick if (db->db_level == 0 && dr->dt.dl.dr_override_state == DR_OVERRIDDEN) { 2784b24ab676SJeff Bonwick ASSERT(db->db_state != DB_NOFILL); 2785b24ab676SJeff Bonwick dr->dr_zio = zio_write(zio, os->os_spa, txg, 2786b24ab676SJeff Bonwick db->db_blkptr, data->b_data, arc_buf_size(data), &zp, 2787*69962b56SMatthew Ahrens dbuf_write_override_ready, NULL, dbuf_write_override_done, 2788*69962b56SMatthew Ahrens dr, ZIO_PRIORITY_ASYNC_WRITE, ZIO_FLAG_MUSTSUCCEED, &zb); 2789b24ab676SJeff Bonwick mutex_enter(&db->db_mtx); 2790b24ab676SJeff Bonwick dr->dt.dl.dr_override_state = DR_NOT_OVERRIDDEN; 2791b24ab676SJeff Bonwick zio_write_override(dr->dr_zio, &dr->dt.dl.dr_overridden_by, 279280901aeaSGeorge Wilson dr->dt.dl.dr_copies, dr->dt.dl.dr_nopwrite); 2793b24ab676SJeff Bonwick mutex_exit(&db->db_mtx); 2794b24ab676SJeff Bonwick } else if (db->db_state == DB_NOFILL) { 2795810e43b2SBill Pijewski ASSERT(zp.zp_checksum == ZIO_CHECKSUM_OFF || 2796810e43b2SBill Pijewski zp.zp_checksum == ZIO_CHECKSUM_NOPARITY); 2797b24ab676SJeff Bonwick dr->dr_zio = zio_write(zio, os->os_spa, txg, 2798b24ab676SJeff Bonwick db->db_blkptr, NULL, db->db.db_size, &zp, 2799*69962b56SMatthew Ahrens dbuf_write_nofill_ready, NULL, dbuf_write_nofill_done, db, 2800b24ab676SJeff Bonwick ZIO_PRIORITY_ASYNC_WRITE, 2801b24ab676SJeff Bonwick ZIO_FLAG_MUSTSUCCEED | ZIO_FLAG_NODATA, &zb); 2802b24ab676SJeff Bonwick } else { 2803b24ab676SJeff Bonwick ASSERT(arc_released(data)); 2804b24ab676SJeff Bonwick dr->dr_zio = arc_write(zio, os->os_spa, txg, 2805aad02571SSaso Kiselkov db->db_blkptr, data, DBUF_IS_L2CACHEABLE(db), 2806aad02571SSaso Kiselkov DBUF_IS_L2COMPRESSIBLE(db), &zp, dbuf_write_ready, 2807*69962b56SMatthew Ahrens dbuf_write_physdone, dbuf_write_done, db, 2808*69962b56SMatthew Ahrens ZIO_PRIORITY_ASYNC_WRITE, ZIO_FLAG_MUSTSUCCEED, &zb); 2809b24ab676SJeff Bonwick } 2810fa9e4066Sahrens } 2811