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 /* 225a98e54bSBrendan Gregg - Sun Microsystems * Copyright 2009 Sun Microsystems, Inc. All rights reserved. 23fa9e4066Sahrens * Use is subject to license terms. 24fa9e4066Sahrens */ 25fa9e4066Sahrens 26fa9e4066Sahrens #include <sys/zfs_context.h> 27fa9e4066Sahrens #include <sys/dmu.h> 28fa9e4066Sahrens #include <sys/dmu_impl.h> 29fa9e4066Sahrens #include <sys/dbuf.h> 30fa9e4066Sahrens #include <sys/dmu_objset.h> 31fa9e4066Sahrens #include <sys/dsl_dataset.h> 32fa9e4066Sahrens #include <sys/dsl_dir.h> 33fa9e4066Sahrens #include <sys/dmu_tx.h> 34fa9e4066Sahrens #include <sys/spa.h> 35fa9e4066Sahrens #include <sys/zio.h> 36fa9e4066Sahrens #include <sys/dmu_zfetch.h> 37fa9e4066Sahrens 38fa9e4066Sahrens static void dbuf_destroy(dmu_buf_impl_t *db); 39fa9e4066Sahrens static int dbuf_undirty(dmu_buf_impl_t *db, dmu_tx_t *tx); 40088f3894Sahrens static void dbuf_write(dbuf_dirty_record_t *dr, arc_buf_t *data, dmu_tx_t *tx); 41c717a561Smaybee static arc_done_func_t dbuf_write_ready; 42fa9e4066Sahrens static arc_done_func_t dbuf_write_done; 4382c9918fSTim Haley static zio_done_func_t dbuf_skip_write_ready; 4482c9918fSTim Haley static zio_done_func_t dbuf_skip_write_done; 45fa9e4066Sahrens 46fa9e4066Sahrens /* 47fa9e4066Sahrens * Global data structures and functions for the dbuf cache. 48fa9e4066Sahrens */ 49fa9e4066Sahrens static kmem_cache_t *dbuf_cache; 50fa9e4066Sahrens 51fa9e4066Sahrens /* ARGSUSED */ 52fa9e4066Sahrens static int 53fa9e4066Sahrens dbuf_cons(void *vdb, void *unused, int kmflag) 54fa9e4066Sahrens { 55fa9e4066Sahrens dmu_buf_impl_t *db = vdb; 56fa9e4066Sahrens bzero(db, sizeof (dmu_buf_impl_t)); 57fa9e4066Sahrens 58fa9e4066Sahrens mutex_init(&db->db_mtx, NULL, MUTEX_DEFAULT, NULL); 59fa9e4066Sahrens cv_init(&db->db_changed, NULL, CV_DEFAULT, NULL); 60fa9e4066Sahrens refcount_create(&db->db_holds); 61fa9e4066Sahrens return (0); 62fa9e4066Sahrens } 63fa9e4066Sahrens 64fa9e4066Sahrens /* ARGSUSED */ 65fa9e4066Sahrens static void 66fa9e4066Sahrens dbuf_dest(void *vdb, void *unused) 67fa9e4066Sahrens { 68fa9e4066Sahrens dmu_buf_impl_t *db = vdb; 69fa9e4066Sahrens mutex_destroy(&db->db_mtx); 70fa9e4066Sahrens cv_destroy(&db->db_changed); 71fa9e4066Sahrens refcount_destroy(&db->db_holds); 72fa9e4066Sahrens } 73fa9e4066Sahrens 74fa9e4066Sahrens /* 75fa9e4066Sahrens * dbuf hash table routines 76fa9e4066Sahrens */ 77fa9e4066Sahrens static dbuf_hash_table_t dbuf_hash_table; 78fa9e4066Sahrens 79fa9e4066Sahrens static uint64_t dbuf_hash_count; 80fa9e4066Sahrens 81fa9e4066Sahrens static uint64_t 82fa9e4066Sahrens dbuf_hash(void *os, uint64_t obj, uint8_t lvl, uint64_t blkid) 83fa9e4066Sahrens { 84fa9e4066Sahrens uintptr_t osv = (uintptr_t)os; 85fa9e4066Sahrens uint64_t crc = -1ULL; 86fa9e4066Sahrens 87fa9e4066Sahrens ASSERT(zfs_crc64_table[128] == ZFS_CRC64_POLY); 88fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (lvl)) & 0xFF]; 89fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (osv >> 6)) & 0xFF]; 90fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (obj >> 0)) & 0xFF]; 91fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (obj >> 8)) & 0xFF]; 92fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (blkid >> 0)) & 0xFF]; 93fa9e4066Sahrens crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (blkid >> 8)) & 0xFF]; 94fa9e4066Sahrens 95fa9e4066Sahrens crc ^= (osv>>14) ^ (obj>>16) ^ (blkid>>16); 96fa9e4066Sahrens 97fa9e4066Sahrens return (crc); 98fa9e4066Sahrens } 99fa9e4066Sahrens 100fa9e4066Sahrens #define DBUF_HASH(os, obj, level, blkid) dbuf_hash(os, obj, level, blkid); 101fa9e4066Sahrens 102fa9e4066Sahrens #define DBUF_EQUAL(dbuf, os, obj, level, blkid) \ 103fa9e4066Sahrens ((dbuf)->db.db_object == (obj) && \ 104fa9e4066Sahrens (dbuf)->db_objset == (os) && \ 105fa9e4066Sahrens (dbuf)->db_level == (level) && \ 106fa9e4066Sahrens (dbuf)->db_blkid == (blkid)) 107fa9e4066Sahrens 108fa9e4066Sahrens dmu_buf_impl_t * 109fa9e4066Sahrens dbuf_find(dnode_t *dn, uint8_t level, uint64_t blkid) 110fa9e4066Sahrens { 111fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 112fa9e4066Sahrens objset_impl_t *os = dn->dn_objset; 113fa9e4066Sahrens uint64_t obj = dn->dn_object; 114fa9e4066Sahrens uint64_t hv = DBUF_HASH(os, obj, level, blkid); 115fa9e4066Sahrens uint64_t idx = hv & h->hash_table_mask; 116fa9e4066Sahrens dmu_buf_impl_t *db; 117fa9e4066Sahrens 118fa9e4066Sahrens mutex_enter(DBUF_HASH_MUTEX(h, idx)); 119fa9e4066Sahrens for (db = h->hash_table[idx]; db != NULL; db = db->db_hash_next) { 120fa9e4066Sahrens if (DBUF_EQUAL(db, os, obj, level, blkid)) { 121fa9e4066Sahrens mutex_enter(&db->db_mtx); 122ea8dc4b6Seschrock if (db->db_state != DB_EVICTING) { 123fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 124fa9e4066Sahrens return (db); 125fa9e4066Sahrens } 126fa9e4066Sahrens mutex_exit(&db->db_mtx); 127fa9e4066Sahrens } 128fa9e4066Sahrens } 129fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 130fa9e4066Sahrens return (NULL); 131fa9e4066Sahrens } 132fa9e4066Sahrens 133fa9e4066Sahrens /* 134fa9e4066Sahrens * Insert an entry into the hash table. If there is already an element 135fa9e4066Sahrens * equal to elem in the hash table, then the already existing element 136fa9e4066Sahrens * will be returned and the new element will not be inserted. 137fa9e4066Sahrens * Otherwise returns NULL. 138fa9e4066Sahrens */ 139fa9e4066Sahrens static dmu_buf_impl_t * 140fa9e4066Sahrens dbuf_hash_insert(dmu_buf_impl_t *db) 141fa9e4066Sahrens { 142fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 143fa9e4066Sahrens objset_impl_t *os = db->db_objset; 144fa9e4066Sahrens uint64_t obj = db->db.db_object; 145fa9e4066Sahrens int level = db->db_level; 146fa9e4066Sahrens uint64_t blkid = db->db_blkid; 147fa9e4066Sahrens uint64_t hv = DBUF_HASH(os, obj, level, blkid); 148fa9e4066Sahrens uint64_t idx = hv & h->hash_table_mask; 149fa9e4066Sahrens dmu_buf_impl_t *dbf; 150fa9e4066Sahrens 151fa9e4066Sahrens mutex_enter(DBUF_HASH_MUTEX(h, idx)); 152fa9e4066Sahrens for (dbf = h->hash_table[idx]; dbf != NULL; dbf = dbf->db_hash_next) { 153fa9e4066Sahrens if (DBUF_EQUAL(dbf, os, obj, level, blkid)) { 154fa9e4066Sahrens mutex_enter(&dbf->db_mtx); 155ea8dc4b6Seschrock if (dbf->db_state != DB_EVICTING) { 156fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 157fa9e4066Sahrens return (dbf); 158fa9e4066Sahrens } 159fa9e4066Sahrens mutex_exit(&dbf->db_mtx); 160fa9e4066Sahrens } 161fa9e4066Sahrens } 162fa9e4066Sahrens 163fa9e4066Sahrens mutex_enter(&db->db_mtx); 164fa9e4066Sahrens db->db_hash_next = h->hash_table[idx]; 165fa9e4066Sahrens h->hash_table[idx] = db; 166fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 167fa9e4066Sahrens atomic_add_64(&dbuf_hash_count, 1); 168fa9e4066Sahrens 169fa9e4066Sahrens return (NULL); 170fa9e4066Sahrens } 171fa9e4066Sahrens 172fa9e4066Sahrens /* 173fa9e4066Sahrens * Remove an entry from the hash table. This operation will 174fa9e4066Sahrens * fail if there are any existing holds on the db. 175fa9e4066Sahrens */ 176fa9e4066Sahrens static void 177fa9e4066Sahrens dbuf_hash_remove(dmu_buf_impl_t *db) 178fa9e4066Sahrens { 179fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 180fa9e4066Sahrens uint64_t hv = DBUF_HASH(db->db_objset, db->db.db_object, 181fa9e4066Sahrens db->db_level, db->db_blkid); 182fa9e4066Sahrens uint64_t idx = hv & h->hash_table_mask; 183fa9e4066Sahrens dmu_buf_impl_t *dbf, **dbp; 184fa9e4066Sahrens 185fa9e4066Sahrens /* 186fa9e4066Sahrens * We musn't hold db_mtx to maintin lock ordering: 187fa9e4066Sahrens * DBUF_HASH_MUTEX > db_mtx. 188fa9e4066Sahrens */ 189fa9e4066Sahrens ASSERT(refcount_is_zero(&db->db_holds)); 190ea8dc4b6Seschrock ASSERT(db->db_state == DB_EVICTING); 191fa9e4066Sahrens ASSERT(!MUTEX_HELD(&db->db_mtx)); 192fa9e4066Sahrens 193fa9e4066Sahrens mutex_enter(DBUF_HASH_MUTEX(h, idx)); 194fa9e4066Sahrens dbp = &h->hash_table[idx]; 195fa9e4066Sahrens while ((dbf = *dbp) != db) { 196fa9e4066Sahrens dbp = &dbf->db_hash_next; 197fa9e4066Sahrens ASSERT(dbf != NULL); 198fa9e4066Sahrens } 199fa9e4066Sahrens *dbp = db->db_hash_next; 200fa9e4066Sahrens db->db_hash_next = NULL; 201fa9e4066Sahrens mutex_exit(DBUF_HASH_MUTEX(h, idx)); 202fa9e4066Sahrens atomic_add_64(&dbuf_hash_count, -1); 203fa9e4066Sahrens } 204fa9e4066Sahrens 205ea8dc4b6Seschrock static arc_evict_func_t dbuf_do_evict; 206fa9e4066Sahrens 207fa9e4066Sahrens static void 208fa9e4066Sahrens dbuf_evict_user(dmu_buf_impl_t *db) 209fa9e4066Sahrens { 210fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 211fa9e4066Sahrens 212c717a561Smaybee if (db->db_level != 0 || db->db_evict_func == NULL) 213fa9e4066Sahrens return; 214fa9e4066Sahrens 215c717a561Smaybee if (db->db_user_data_ptr_ptr) 216c717a561Smaybee *db->db_user_data_ptr_ptr = db->db.db_data; 217c717a561Smaybee db->db_evict_func(&db->db, db->db_user_ptr); 218c717a561Smaybee db->db_user_ptr = NULL; 219c717a561Smaybee db->db_user_data_ptr_ptr = NULL; 220c717a561Smaybee db->db_evict_func = NULL; 221fa9e4066Sahrens } 222fa9e4066Sahrens 223fa9e4066Sahrens void 224ea8dc4b6Seschrock dbuf_evict(dmu_buf_impl_t *db) 225ea8dc4b6Seschrock { 226ea8dc4b6Seschrock ASSERT(MUTEX_HELD(&db->db_mtx)); 227ea8dc4b6Seschrock ASSERT(db->db_buf == NULL); 228c717a561Smaybee ASSERT(db->db_data_pending == NULL); 229ea8dc4b6Seschrock 230ea8dc4b6Seschrock dbuf_clear(db); 231ea8dc4b6Seschrock dbuf_destroy(db); 232ea8dc4b6Seschrock } 233ea8dc4b6Seschrock 234ea8dc4b6Seschrock void 235fa9e4066Sahrens dbuf_init(void) 236fa9e4066Sahrens { 237ea8dc4b6Seschrock uint64_t hsize = 1ULL << 16; 238fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 239fa9e4066Sahrens int i; 240fa9e4066Sahrens 241fa9e4066Sahrens /* 242fa9e4066Sahrens * The hash table is big enough to fill all of physical memory 243ea8dc4b6Seschrock * with an average 4K block size. The table will take up 244ea8dc4b6Seschrock * totalmem*sizeof(void*)/4K (i.e. 2MB/GB with 8-byte pointers). 245fa9e4066Sahrens */ 246ea8dc4b6Seschrock while (hsize * 4096 < physmem * PAGESIZE) 247fa9e4066Sahrens hsize <<= 1; 248fa9e4066Sahrens 249ea8dc4b6Seschrock retry: 250fa9e4066Sahrens h->hash_table_mask = hsize - 1; 251ea8dc4b6Seschrock h->hash_table = kmem_zalloc(hsize * sizeof (void *), KM_NOSLEEP); 252ea8dc4b6Seschrock if (h->hash_table == NULL) { 253ea8dc4b6Seschrock /* XXX - we should really return an error instead of assert */ 254ea8dc4b6Seschrock ASSERT(hsize > (1ULL << 10)); 255ea8dc4b6Seschrock hsize >>= 1; 256ea8dc4b6Seschrock goto retry; 257ea8dc4b6Seschrock } 258fa9e4066Sahrens 259fa9e4066Sahrens dbuf_cache = kmem_cache_create("dmu_buf_impl_t", 260fa9e4066Sahrens sizeof (dmu_buf_impl_t), 261fa9e4066Sahrens 0, dbuf_cons, dbuf_dest, NULL, NULL, NULL, 0); 262fa9e4066Sahrens 263fa9e4066Sahrens for (i = 0; i < DBUF_MUTEXES; i++) 264fa9e4066Sahrens mutex_init(&h->hash_mutexes[i], NULL, MUTEX_DEFAULT, NULL); 265fa9e4066Sahrens } 266fa9e4066Sahrens 267fa9e4066Sahrens void 268fa9e4066Sahrens dbuf_fini(void) 269fa9e4066Sahrens { 270fa9e4066Sahrens dbuf_hash_table_t *h = &dbuf_hash_table; 271fa9e4066Sahrens int i; 272fa9e4066Sahrens 273fa9e4066Sahrens for (i = 0; i < DBUF_MUTEXES; i++) 274fa9e4066Sahrens mutex_destroy(&h->hash_mutexes[i]); 275fa9e4066Sahrens kmem_free(h->hash_table, (h->hash_table_mask + 1) * sizeof (void *)); 276fa9e4066Sahrens kmem_cache_destroy(dbuf_cache); 277fa9e4066Sahrens } 278fa9e4066Sahrens 279fa9e4066Sahrens /* 280fa9e4066Sahrens * Other stuff. 281fa9e4066Sahrens */ 282fa9e4066Sahrens 2839c9dc39aSek110237 #ifdef ZFS_DEBUG 284fa9e4066Sahrens static void 285fa9e4066Sahrens dbuf_verify(dmu_buf_impl_t *db) 286fa9e4066Sahrens { 287fa9e4066Sahrens dnode_t *dn = db->db_dnode; 288fa9e4066Sahrens 289fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 290fa9e4066Sahrens 291fa9e4066Sahrens if (!(zfs_flags & ZFS_DEBUG_DBUF_VERIFY)) 292fa9e4066Sahrens return; 293fa9e4066Sahrens 294fa9e4066Sahrens ASSERT(db->db_objset != NULL); 295fa9e4066Sahrens if (dn == NULL) { 296fa9e4066Sahrens ASSERT(db->db_parent == NULL); 297fa9e4066Sahrens ASSERT(db->db_blkptr == NULL); 298fa9e4066Sahrens } else { 299fa9e4066Sahrens ASSERT3U(db->db.db_object, ==, dn->dn_object); 300fa9e4066Sahrens ASSERT3P(db->db_objset, ==, dn->dn_objset); 301fa9e4066Sahrens ASSERT3U(db->db_level, <, dn->dn_nlevels); 302ea8dc4b6Seschrock ASSERT(db->db_blkid == DB_BONUS_BLKID || 303ea8dc4b6Seschrock list_head(&dn->dn_dbufs)); 304fa9e4066Sahrens } 305fa9e4066Sahrens if (db->db_blkid == DB_BONUS_BLKID) { 306fa9e4066Sahrens ASSERT(dn != NULL); 3071934e92fSmaybee ASSERT3U(db->db.db_size, >=, dn->dn_bonuslen); 308fa9e4066Sahrens ASSERT3U(db->db.db_offset, ==, DB_BONUS_BLKID); 309fa9e4066Sahrens } else { 310fa9e4066Sahrens ASSERT3U(db->db.db_offset, ==, db->db_blkid * db->db.db_size); 311fa9e4066Sahrens } 312fa9e4066Sahrens 31388b7b0f2SMatthew Ahrens /* 31488b7b0f2SMatthew Ahrens * We can't assert that db_size matches dn_datablksz because it 31588b7b0f2SMatthew Ahrens * can be momentarily different when another thread is doing 31688b7b0f2SMatthew Ahrens * dnode_set_blksz(). 31788b7b0f2SMatthew Ahrens */ 31888b7b0f2SMatthew Ahrens if (db->db_level == 0 && db->db.db_object == DMU_META_DNODE_OBJECT) { 319c717a561Smaybee dbuf_dirty_record_t *dr = db->db_data_pending; 320fa9e4066Sahrens /* 32188b7b0f2SMatthew Ahrens * It should only be modified in syncing context, so 32288b7b0f2SMatthew Ahrens * make sure we only have one copy of the data. 323fa9e4066Sahrens */ 324c717a561Smaybee ASSERT(dr == NULL || dr->dt.dl.dr_data == db->db_buf); 325fa9e4066Sahrens } 326fa9e4066Sahrens 327fa9e4066Sahrens /* verify db->db_blkptr */ 328fa9e4066Sahrens if (db->db_blkptr) { 329fa9e4066Sahrens if (db->db_parent == dn->dn_dbuf) { 330fa9e4066Sahrens /* db is pointed to by the dnode */ 331fa9e4066Sahrens /* ASSERT3U(db->db_blkid, <, dn->dn_nblkptr); */ 332ea8dc4b6Seschrock if (db->db.db_object == DMU_META_DNODE_OBJECT) 333fa9e4066Sahrens ASSERT(db->db_parent == NULL); 334fa9e4066Sahrens else 335fa9e4066Sahrens ASSERT(db->db_parent != NULL); 336fa9e4066Sahrens ASSERT3P(db->db_blkptr, ==, 337fa9e4066Sahrens &dn->dn_phys->dn_blkptr[db->db_blkid]); 338fa9e4066Sahrens } else { 339fa9e4066Sahrens /* db is pointed to by an indirect block */ 340fa9e4066Sahrens int epb = db->db_parent->db.db_size >> SPA_BLKPTRSHIFT; 341fa9e4066Sahrens ASSERT3U(db->db_parent->db_level, ==, db->db_level+1); 342fa9e4066Sahrens ASSERT3U(db->db_parent->db.db_object, ==, 343fa9e4066Sahrens db->db.db_object); 344fa9e4066Sahrens /* 345fa9e4066Sahrens * dnode_grow_indblksz() can make this fail if we don't 346fa9e4066Sahrens * have the struct_rwlock. XXX indblksz no longer 347fa9e4066Sahrens * grows. safe to do this now? 348fa9e4066Sahrens */ 349fa9e4066Sahrens if (RW_WRITE_HELD(&db->db_dnode->dn_struct_rwlock)) { 350fa9e4066Sahrens ASSERT3P(db->db_blkptr, ==, 351fa9e4066Sahrens ((blkptr_t *)db->db_parent->db.db_data + 352fa9e4066Sahrens db->db_blkid % epb)); 353fa9e4066Sahrens } 354fa9e4066Sahrens } 355fa9e4066Sahrens } 356fa9e4066Sahrens if ((db->db_blkptr == NULL || BP_IS_HOLE(db->db_blkptr)) && 357fa9e4066Sahrens db->db.db_data && db->db_blkid != DB_BONUS_BLKID && 358fa9e4066Sahrens db->db_state != DB_FILL && !dn->dn_free_txg) { 359fa9e4066Sahrens /* 360fa9e4066Sahrens * If the blkptr isn't set but they have nonzero data, 361fa9e4066Sahrens * it had better be dirty, otherwise we'll lose that 362fa9e4066Sahrens * data when we evict this buffer. 363fa9e4066Sahrens */ 364fa9e4066Sahrens if (db->db_dirtycnt == 0) { 365fa9e4066Sahrens uint64_t *buf = db->db.db_data; 366fa9e4066Sahrens int i; 367fa9e4066Sahrens 368fa9e4066Sahrens for (i = 0; i < db->db.db_size >> 3; i++) { 369fa9e4066Sahrens ASSERT(buf[i] == 0); 370fa9e4066Sahrens } 371fa9e4066Sahrens } 372fa9e4066Sahrens } 373fa9e4066Sahrens } 3749c9dc39aSek110237 #endif 375fa9e4066Sahrens 376fa9e4066Sahrens static void 377fa9e4066Sahrens dbuf_update_data(dmu_buf_impl_t *db) 378fa9e4066Sahrens { 379fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 380c717a561Smaybee if (db->db_level == 0 && db->db_user_data_ptr_ptr) { 381fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 382c717a561Smaybee *db->db_user_data_ptr_ptr = db->db.db_data; 383fa9e4066Sahrens } 384fa9e4066Sahrens } 385fa9e4066Sahrens 386fa9e4066Sahrens static void 387fa9e4066Sahrens dbuf_set_data(dmu_buf_impl_t *db, arc_buf_t *buf) 388fa9e4066Sahrens { 389fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 390ea8dc4b6Seschrock ASSERT(db->db_buf == NULL || !arc_has_callback(db->db_buf)); 391fa9e4066Sahrens db->db_buf = buf; 392ea8dc4b6Seschrock if (buf != NULL) { 393ea8dc4b6Seschrock ASSERT(buf->b_data != NULL); 394fa9e4066Sahrens db->db.db_data = buf->b_data; 395ea8dc4b6Seschrock if (!arc_released(buf)) 396ea8dc4b6Seschrock arc_set_callback(buf, dbuf_do_evict, db); 397fa9e4066Sahrens dbuf_update_data(db); 398ea8dc4b6Seschrock } else { 399ea8dc4b6Seschrock dbuf_evict_user(db); 400ea8dc4b6Seschrock db->db.db_data = NULL; 40182c9918fSTim Haley if (db->db_state != DB_NOFILL) 402ea8dc4b6Seschrock db->db_state = DB_UNCACHED; 403ea8dc4b6Seschrock } 404fa9e4066Sahrens } 405fa9e4066Sahrens 406fa9e4066Sahrens uint64_t 407fa9e4066Sahrens dbuf_whichblock(dnode_t *dn, uint64_t offset) 408fa9e4066Sahrens { 409fa9e4066Sahrens if (dn->dn_datablkshift) { 410fa9e4066Sahrens return (offset >> dn->dn_datablkshift); 411fa9e4066Sahrens } else { 412fa9e4066Sahrens ASSERT3U(offset, <, dn->dn_datablksz); 413fa9e4066Sahrens return (0); 414fa9e4066Sahrens } 415fa9e4066Sahrens } 416fa9e4066Sahrens 417fa9e4066Sahrens static void 418fa9e4066Sahrens dbuf_read_done(zio_t *zio, arc_buf_t *buf, void *vdb) 419fa9e4066Sahrens { 420fa9e4066Sahrens dmu_buf_impl_t *db = vdb; 421fa9e4066Sahrens 422fa9e4066Sahrens mutex_enter(&db->db_mtx); 423fa9e4066Sahrens ASSERT3U(db->db_state, ==, DB_READ); 424fa9e4066Sahrens /* 425fa9e4066Sahrens * All reads are synchronous, so we must have a hold on the dbuf 426fa9e4066Sahrens */ 427fa9e4066Sahrens ASSERT(refcount_count(&db->db_holds) > 0); 428ea8dc4b6Seschrock ASSERT(db->db_buf == NULL); 429fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 430c717a561Smaybee if (db->db_level == 0 && db->db_freed_in_flight) { 431fa9e4066Sahrens /* we were freed in flight; disregard any error */ 432fa9e4066Sahrens arc_release(buf, db); 433fa9e4066Sahrens bzero(buf->b_data, db->db.db_size); 4346b4acc8bSahrens arc_buf_freeze(buf); 435c717a561Smaybee db->db_freed_in_flight = FALSE; 436fa9e4066Sahrens dbuf_set_data(db, buf); 437fa9e4066Sahrens db->db_state = DB_CACHED; 438fa9e4066Sahrens } else if (zio == NULL || zio->io_error == 0) { 439fa9e4066Sahrens dbuf_set_data(db, buf); 440fa9e4066Sahrens db->db_state = DB_CACHED; 441fa9e4066Sahrens } else { 442fa9e4066Sahrens ASSERT(db->db_blkid != DB_BONUS_BLKID); 443fa9e4066Sahrens ASSERT3P(db->db_buf, ==, NULL); 444ea8dc4b6Seschrock VERIFY(arc_buf_remove_ref(buf, db) == 1); 445ea8dc4b6Seschrock db->db_state = DB_UNCACHED; 446fa9e4066Sahrens } 447fa9e4066Sahrens cv_broadcast(&db->db_changed); 448fa9e4066Sahrens mutex_exit(&db->db_mtx); 449ea8dc4b6Seschrock dbuf_rele(db, NULL); 450fa9e4066Sahrens } 451fa9e4066Sahrens 452ea8dc4b6Seschrock static void 45313506d1eSmaybee dbuf_read_impl(dmu_buf_impl_t *db, zio_t *zio, uint32_t *flags) 454fa9e4066Sahrens { 455088f3894Sahrens dnode_t *dn = db->db_dnode; 456ea8dc4b6Seschrock zbookmark_t zb; 45713506d1eSmaybee uint32_t aflags = ARC_NOWAIT; 458088f3894Sahrens arc_buf_t *pbuf; 459fa9e4066Sahrens 460fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 461fa9e4066Sahrens /* We need the struct_rwlock to prevent db_blkptr from changing. */ 462088f3894Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 463ea8dc4b6Seschrock ASSERT(MUTEX_HELD(&db->db_mtx)); 464ea8dc4b6Seschrock ASSERT(db->db_state == DB_UNCACHED); 465ea8dc4b6Seschrock ASSERT(db->db_buf == NULL); 466fa9e4066Sahrens 467fa9e4066Sahrens if (db->db_blkid == DB_BONUS_BLKID) { 468088f3894Sahrens int bonuslen = dn->dn_bonuslen; 4691934e92fSmaybee 4701934e92fSmaybee ASSERT3U(bonuslen, <=, db->db.db_size); 471ea8dc4b6Seschrock db->db.db_data = zio_buf_alloc(DN_MAX_BONUSLEN); 4725a98e54bSBrendan Gregg - Sun Microsystems arc_space_consume(DN_MAX_BONUSLEN, ARC_SPACE_OTHER); 4731934e92fSmaybee if (bonuslen < DN_MAX_BONUSLEN) 474ea8dc4b6Seschrock bzero(db->db.db_data, DN_MAX_BONUSLEN); 475088f3894Sahrens bcopy(DN_BONUS(dn->dn_phys), db->db.db_data, 4761934e92fSmaybee bonuslen); 477ea8dc4b6Seschrock dbuf_update_data(db); 478fa9e4066Sahrens db->db_state = DB_CACHED; 479fa9e4066Sahrens mutex_exit(&db->db_mtx); 480fa9e4066Sahrens return; 481fa9e4066Sahrens } 482fa9e4066Sahrens 4831c8564a7SMark Maybee /* 4841c8564a7SMark Maybee * Recheck BP_IS_HOLE() after dnode_block_freed() in case dnode_sync() 4851c8564a7SMark Maybee * processes the delete record and clears the bp while we are waiting 4861c8564a7SMark Maybee * for the dn_mtx (resulting in a "no" from block_freed). 4871c8564a7SMark Maybee */ 488088f3894Sahrens if (db->db_blkptr == NULL || BP_IS_HOLE(db->db_blkptr) || 4891c8564a7SMark Maybee (db->db_level == 0 && (dnode_block_freed(dn, db->db_blkid) || 4901c8564a7SMark Maybee BP_IS_HOLE(db->db_blkptr)))) { 491ad23a2dbSjohansen arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 492ad23a2dbSjohansen 493088f3894Sahrens dbuf_set_data(db, arc_buf_alloc(dn->dn_objset->os_spa, 494ad23a2dbSjohansen db->db.db_size, db, type)); 495fa9e4066Sahrens bzero(db->db.db_data, db->db.db_size); 496fa9e4066Sahrens db->db_state = DB_CACHED; 49713506d1eSmaybee *flags |= DB_RF_CACHED; 498fa9e4066Sahrens mutex_exit(&db->db_mtx); 499fa9e4066Sahrens return; 500fa9e4066Sahrens } 501fa9e4066Sahrens 502fa9e4066Sahrens db->db_state = DB_READ; 503fa9e4066Sahrens mutex_exit(&db->db_mtx); 504fa9e4066Sahrens 5053baa08fcSek110237 if (DBUF_IS_L2CACHEABLE(db)) 5063baa08fcSek110237 aflags |= ARC_L2CACHE; 5073baa08fcSek110237 508ea8dc4b6Seschrock zb.zb_objset = db->db_objset->os_dsl_dataset ? 509ea8dc4b6Seschrock db->db_objset->os_dsl_dataset->ds_object : 0; 510ea8dc4b6Seschrock zb.zb_object = db->db.db_object; 511ea8dc4b6Seschrock zb.zb_level = db->db_level; 512ea8dc4b6Seschrock zb.zb_blkid = db->db_blkid; 513ea8dc4b6Seschrock 514ea8dc4b6Seschrock dbuf_add_ref(db, NULL); 515fa9e4066Sahrens /* ZIO_FLAG_CANFAIL callers have to check the parent zio's error */ 516088f3894Sahrens 517088f3894Sahrens if (db->db_parent) 518088f3894Sahrens pbuf = db->db_parent->db_buf; 519088f3894Sahrens else 520088f3894Sahrens pbuf = db->db_objset->os_phys_buf; 521088f3894Sahrens 522088f3894Sahrens (void) arc_read(zio, dn->dn_objset->os_spa, db->db_blkptr, pbuf, 523fa9e4066Sahrens dbuf_read_done, db, ZIO_PRIORITY_SYNC_READ, 52413506d1eSmaybee (*flags & DB_RF_CANFAIL) ? ZIO_FLAG_CANFAIL : ZIO_FLAG_MUSTSUCCEED, 52513506d1eSmaybee &aflags, &zb); 52613506d1eSmaybee if (aflags & ARC_CACHED) 52713506d1eSmaybee *flags |= DB_RF_CACHED; 528fa9e4066Sahrens } 529fa9e4066Sahrens 530ea8dc4b6Seschrock int 531ea8dc4b6Seschrock dbuf_read(dmu_buf_impl_t *db, zio_t *zio, uint32_t flags) 532fa9e4066Sahrens { 533ea8dc4b6Seschrock int err = 0; 534ea8dc4b6Seschrock int havepzio = (zio != NULL); 53513506d1eSmaybee int prefetch; 536fa9e4066Sahrens 537fa9e4066Sahrens /* 538fa9e4066Sahrens * We don't have to hold the mutex to check db_state because it 539fa9e4066Sahrens * can't be freed while we have a hold on the buffer. 540fa9e4066Sahrens */ 541fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 542fa9e4066Sahrens 54382c9918fSTim Haley if (db->db_state == DB_NOFILL) 54482c9918fSTim Haley return (EIO); 54582c9918fSTim Haley 546fa9e4066Sahrens if ((flags & DB_RF_HAVESTRUCT) == 0) 547fa9e4066Sahrens rw_enter(&db->db_dnode->dn_struct_rwlock, RW_READER); 548fa9e4066Sahrens 54913506d1eSmaybee prefetch = db->db_level == 0 && db->db_blkid != DB_BONUS_BLKID && 5503baa08fcSek110237 (flags & DB_RF_NOPREFETCH) == 0 && db->db_dnode != NULL && 5513baa08fcSek110237 DBUF_IS_CACHEABLE(db); 55213506d1eSmaybee 553fa9e4066Sahrens mutex_enter(&db->db_mtx); 554ea8dc4b6Seschrock if (db->db_state == DB_CACHED) { 555ea8dc4b6Seschrock mutex_exit(&db->db_mtx); 55613506d1eSmaybee if (prefetch) 55713506d1eSmaybee dmu_zfetch(&db->db_dnode->dn_zfetch, db->db.db_offset, 55813506d1eSmaybee db->db.db_size, TRUE); 559ea8dc4b6Seschrock if ((flags & DB_RF_HAVESTRUCT) == 0) 560ea8dc4b6Seschrock rw_exit(&db->db_dnode->dn_struct_rwlock); 561ea8dc4b6Seschrock } else if (db->db_state == DB_UNCACHED) { 562ea8dc4b6Seschrock if (zio == NULL) { 563ea8dc4b6Seschrock zio = zio_root(db->db_dnode->dn_objset->os_spa, 564ea8dc4b6Seschrock NULL, NULL, ZIO_FLAG_CANFAIL); 565ea8dc4b6Seschrock } 56613506d1eSmaybee dbuf_read_impl(db, zio, &flags); 56713506d1eSmaybee 568ea8dc4b6Seschrock /* dbuf_read_impl has dropped db_mtx for us */ 569ea8dc4b6Seschrock 57013506d1eSmaybee if (prefetch) 571ea8dc4b6Seschrock dmu_zfetch(&db->db_dnode->dn_zfetch, db->db.db_offset, 57213506d1eSmaybee db->db.db_size, flags & DB_RF_CACHED); 573ea8dc4b6Seschrock 574ea8dc4b6Seschrock if ((flags & DB_RF_HAVESTRUCT) == 0) 575ea8dc4b6Seschrock rw_exit(&db->db_dnode->dn_struct_rwlock); 576ea8dc4b6Seschrock 577ea8dc4b6Seschrock if (!havepzio) 578ea8dc4b6Seschrock err = zio_wait(zio); 579ea8dc4b6Seschrock } else { 58013506d1eSmaybee mutex_exit(&db->db_mtx); 58113506d1eSmaybee if (prefetch) 58213506d1eSmaybee dmu_zfetch(&db->db_dnode->dn_zfetch, db->db.db_offset, 58313506d1eSmaybee db->db.db_size, TRUE); 584ea8dc4b6Seschrock if ((flags & DB_RF_HAVESTRUCT) == 0) 585ea8dc4b6Seschrock rw_exit(&db->db_dnode->dn_struct_rwlock); 58613506d1eSmaybee 58713506d1eSmaybee mutex_enter(&db->db_mtx); 588ea8dc4b6Seschrock if ((flags & DB_RF_NEVERWAIT) == 0) { 589ea8dc4b6Seschrock while (db->db_state == DB_READ || 590ea8dc4b6Seschrock db->db_state == DB_FILL) { 591fa9e4066Sahrens ASSERT(db->db_state == DB_READ || 592fa9e4066Sahrens (flags & DB_RF_HAVESTRUCT) == 0); 593fa9e4066Sahrens cv_wait(&db->db_changed, &db->db_mtx); 594fa9e4066Sahrens } 595ea8dc4b6Seschrock if (db->db_state == DB_UNCACHED) 596ea8dc4b6Seschrock err = EIO; 597ea8dc4b6Seschrock } 598fa9e4066Sahrens mutex_exit(&db->db_mtx); 599fa9e4066Sahrens } 600fa9e4066Sahrens 601ea8dc4b6Seschrock ASSERT(err || havepzio || db->db_state == DB_CACHED); 602ea8dc4b6Seschrock return (err); 603fa9e4066Sahrens } 604fa9e4066Sahrens 605fa9e4066Sahrens static void 606fa9e4066Sahrens dbuf_noread(dmu_buf_impl_t *db) 607fa9e4066Sahrens { 608fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 609ea8dc4b6Seschrock ASSERT(db->db_blkid != DB_BONUS_BLKID); 610fa9e4066Sahrens mutex_enter(&db->db_mtx); 611fa9e4066Sahrens while (db->db_state == DB_READ || db->db_state == DB_FILL) 612fa9e4066Sahrens cv_wait(&db->db_changed, &db->db_mtx); 613fa9e4066Sahrens if (db->db_state == DB_UNCACHED) { 614ad23a2dbSjohansen arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 615ad23a2dbSjohansen 616ea8dc4b6Seschrock ASSERT(db->db_buf == NULL); 617fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 618fa9e4066Sahrens dbuf_set_data(db, arc_buf_alloc(db->db_dnode->dn_objset->os_spa, 619ad23a2dbSjohansen db->db.db_size, db, type)); 620fa9e4066Sahrens db->db_state = DB_FILL; 62182c9918fSTim Haley } else if (db->db_state == DB_NOFILL) { 62282c9918fSTim Haley dbuf_set_data(db, NULL); 623fa9e4066Sahrens } else { 624fa9e4066Sahrens ASSERT3U(db->db_state, ==, DB_CACHED); 625fa9e4066Sahrens } 626fa9e4066Sahrens mutex_exit(&db->db_mtx); 627fa9e4066Sahrens } 628fa9e4066Sahrens 629fa9e4066Sahrens /* 630fa9e4066Sahrens * This is our just-in-time copy function. It makes a copy of 631fa9e4066Sahrens * buffers, that have been modified in a previous transaction 632fa9e4066Sahrens * group, before we modify them in the current active group. 633fa9e4066Sahrens * 634fa9e4066Sahrens * This function is used in two places: when we are dirtying a 635fa9e4066Sahrens * buffer for the first time in a txg, and when we are freeing 636fa9e4066Sahrens * a range in a dnode that includes this buffer. 637fa9e4066Sahrens * 638fa9e4066Sahrens * Note that when we are called from dbuf_free_range() we do 639fa9e4066Sahrens * not put a hold on the buffer, we just traverse the active 640fa9e4066Sahrens * dbuf list for the dnode. 641fa9e4066Sahrens */ 642fa9e4066Sahrens static void 643fa9e4066Sahrens dbuf_fix_old_data(dmu_buf_impl_t *db, uint64_t txg) 644fa9e4066Sahrens { 645c717a561Smaybee dbuf_dirty_record_t *dr = db->db_last_dirty; 646fa9e4066Sahrens 647fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 648fa9e4066Sahrens ASSERT(db->db.db_data != NULL); 649c717a561Smaybee ASSERT(db->db_level == 0); 650c717a561Smaybee ASSERT(db->db.db_object != DMU_META_DNODE_OBJECT); 651fa9e4066Sahrens 6524d31c452Smaybee if (dr == NULL || 6534d31c452Smaybee (dr->dt.dl.dr_data != 6544d31c452Smaybee ((db->db_blkid == DB_BONUS_BLKID) ? db->db.db_data : db->db_buf))) 655fa9e4066Sahrens return; 656fa9e4066Sahrens 657fa9e4066Sahrens /* 658c717a561Smaybee * If the last dirty record for this dbuf has not yet synced 659c717a561Smaybee * and its referencing the dbuf data, either: 660c717a561Smaybee * reset the reference to point to a new copy, 661c717a561Smaybee * or (if there a no active holders) 662c717a561Smaybee * just null out the current db_data pointer. 663fa9e4066Sahrens */ 664c717a561Smaybee ASSERT(dr->dr_txg >= txg - 2); 665c717a561Smaybee if (db->db_blkid == DB_BONUS_BLKID) { 666c717a561Smaybee /* Note that the data bufs here are zio_bufs */ 667c717a561Smaybee dr->dt.dl.dr_data = zio_buf_alloc(DN_MAX_BONUSLEN); 6685a98e54bSBrendan Gregg - Sun Microsystems arc_space_consume(DN_MAX_BONUSLEN, ARC_SPACE_OTHER); 669c717a561Smaybee bcopy(db->db.db_data, dr->dt.dl.dr_data, DN_MAX_BONUSLEN); 670c717a561Smaybee } else if (refcount_count(&db->db_holds) > db->db_dirtycnt) { 671ea8dc4b6Seschrock int size = db->db.db_size; 672c717a561Smaybee arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 673c717a561Smaybee dr->dt.dl.dr_data = arc_buf_alloc( 674ad23a2dbSjohansen db->db_dnode->dn_objset->os_spa, size, db, type); 675c717a561Smaybee bcopy(db->db.db_data, dr->dt.dl.dr_data->b_data, size); 676fa9e4066Sahrens } else { 677ea8dc4b6Seschrock dbuf_set_data(db, NULL); 678fa9e4066Sahrens } 679fa9e4066Sahrens } 680ea8dc4b6Seschrock 681fa9e4066Sahrens void 682c717a561Smaybee dbuf_unoverride(dbuf_dirty_record_t *dr) 683fa9e4066Sahrens { 684c717a561Smaybee dmu_buf_impl_t *db = dr->dr_dbuf; 685c717a561Smaybee uint64_t txg = dr->dr_txg; 686c5c6ffa0Smaybee 687c717a561Smaybee ASSERT(MUTEX_HELD(&db->db_mtx)); 688c717a561Smaybee ASSERT(dr->dt.dl.dr_override_state != DR_IN_DMU_SYNC); 689c717a561Smaybee ASSERT(db->db_level == 0); 690c717a561Smaybee 691c717a561Smaybee if (db->db_blkid == DB_BONUS_BLKID || 692c717a561Smaybee dr->dt.dl.dr_override_state == DR_NOT_OVERRIDDEN) 693c717a561Smaybee return; 694c717a561Smaybee 695fa9e4066Sahrens /* free this block */ 696c717a561Smaybee if (!BP_IS_HOLE(&dr->dt.dl.dr_overridden_by)) { 697fa9e4066Sahrens /* XXX can get silent EIO here */ 698088f3894Sahrens (void) dsl_free(NULL, 699088f3894Sahrens spa_get_dsl(db->db_dnode->dn_objset->os_spa), 700c717a561Smaybee txg, &dr->dt.dl.dr_overridden_by, NULL, NULL, ARC_WAIT); 701fa9e4066Sahrens } 702c717a561Smaybee dr->dt.dl.dr_override_state = DR_NOT_OVERRIDDEN; 7036b4acc8bSahrens /* 7046b4acc8bSahrens * Release the already-written buffer, so we leave it in 7056b4acc8bSahrens * a consistent dirty state. Note that all callers are 7066b4acc8bSahrens * modifying the buffer, so they will immediately do 7076b4acc8bSahrens * another (redundant) arc_release(). Therefore, leave 7086b4acc8bSahrens * the buf thawed to save the effort of freezing & 7096b4acc8bSahrens * immediately re-thawing it. 7106b4acc8bSahrens */ 711c717a561Smaybee arc_release(dr->dt.dl.dr_data, db); 712fa9e4066Sahrens } 713fa9e4066Sahrens 714cdb0ab79Smaybee /* 715cdb0ab79Smaybee * Evict (if its unreferenced) or clear (if its referenced) any level-0 716cdb0ab79Smaybee * data blocks in the free range, so that any future readers will find 717cdb0ab79Smaybee * empty blocks. Also, if we happen accross any level-1 dbufs in the 718cdb0ab79Smaybee * range that have not already been marked dirty, mark them dirty so 719cdb0ab79Smaybee * they stay in memory. 720cdb0ab79Smaybee */ 721fa9e4066Sahrens void 722cdb0ab79Smaybee dbuf_free_range(dnode_t *dn, uint64_t start, uint64_t end, dmu_tx_t *tx) 723fa9e4066Sahrens { 724fa9e4066Sahrens dmu_buf_impl_t *db, *db_next; 725fa9e4066Sahrens uint64_t txg = tx->tx_txg; 726cdb0ab79Smaybee int epbs = dn->dn_indblkshift - SPA_BLKPTRSHIFT; 727cdb0ab79Smaybee uint64_t first_l1 = start >> epbs; 728cdb0ab79Smaybee uint64_t last_l1 = end >> epbs; 729fa9e4066Sahrens 730cdb0ab79Smaybee if (end > dn->dn_maxblkid) { 731cdb0ab79Smaybee end = dn->dn_maxblkid; 732cdb0ab79Smaybee last_l1 = end >> epbs; 733cdb0ab79Smaybee } 734cdb0ab79Smaybee dprintf_dnode(dn, "start=%llu end=%llu\n", start, end); 735fa9e4066Sahrens mutex_enter(&dn->dn_dbufs_mtx); 736fa9e4066Sahrens for (db = list_head(&dn->dn_dbufs); db; db = db_next) { 737fa9e4066Sahrens db_next = list_next(&dn->dn_dbufs, db); 738ea8dc4b6Seschrock ASSERT(db->db_blkid != DB_BONUS_BLKID); 739cdb0ab79Smaybee 740cdb0ab79Smaybee if (db->db_level == 1 && 741cdb0ab79Smaybee db->db_blkid >= first_l1 && db->db_blkid <= last_l1) { 742cdb0ab79Smaybee mutex_enter(&db->db_mtx); 743cdb0ab79Smaybee if (db->db_last_dirty && 744cdb0ab79Smaybee db->db_last_dirty->dr_txg < txg) { 745cdb0ab79Smaybee dbuf_add_ref(db, FTAG); 746cdb0ab79Smaybee mutex_exit(&db->db_mtx); 747cdb0ab79Smaybee dbuf_will_dirty(db, tx); 748cdb0ab79Smaybee dbuf_rele(db, FTAG); 749cdb0ab79Smaybee } else { 750cdb0ab79Smaybee mutex_exit(&db->db_mtx); 751cdb0ab79Smaybee } 752cdb0ab79Smaybee } 753cdb0ab79Smaybee 754ea8dc4b6Seschrock if (db->db_level != 0) 755fa9e4066Sahrens continue; 756fa9e4066Sahrens dprintf_dbuf(db, "found buf %s\n", ""); 757cdb0ab79Smaybee if (db->db_blkid < start || db->db_blkid > end) 758fa9e4066Sahrens continue; 759fa9e4066Sahrens 760fa9e4066Sahrens /* found a level 0 buffer in the range */ 761fa9e4066Sahrens if (dbuf_undirty(db, tx)) 762fa9e4066Sahrens continue; 763fa9e4066Sahrens 764fa9e4066Sahrens mutex_enter(&db->db_mtx); 765ea8dc4b6Seschrock if (db->db_state == DB_UNCACHED || 76682c9918fSTim Haley db->db_state == DB_NOFILL || 767ea8dc4b6Seschrock db->db_state == DB_EVICTING) { 768fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 769fa9e4066Sahrens mutex_exit(&db->db_mtx); 770fa9e4066Sahrens continue; 771fa9e4066Sahrens } 772c543ec06Sahrens if (db->db_state == DB_READ || db->db_state == DB_FILL) { 773c543ec06Sahrens /* will be handled in dbuf_read_done or dbuf_rele */ 774c717a561Smaybee db->db_freed_in_flight = TRUE; 775fa9e4066Sahrens mutex_exit(&db->db_mtx); 776fa9e4066Sahrens continue; 777fa9e4066Sahrens } 778ea8dc4b6Seschrock if (refcount_count(&db->db_holds) == 0) { 779ea8dc4b6Seschrock ASSERT(db->db_buf); 780ea8dc4b6Seschrock dbuf_clear(db); 781ea8dc4b6Seschrock continue; 782ea8dc4b6Seschrock } 783c717a561Smaybee /* The dbuf is referenced */ 784fa9e4066Sahrens 785c717a561Smaybee if (db->db_last_dirty != NULL) { 786c717a561Smaybee dbuf_dirty_record_t *dr = db->db_last_dirty; 787c717a561Smaybee 788c717a561Smaybee if (dr->dr_txg == txg) { 789ea8dc4b6Seschrock /* 790c717a561Smaybee * This buffer is "in-use", re-adjust the file 791c717a561Smaybee * size to reflect that this buffer may 792c717a561Smaybee * contain new data when we sync. 793ea8dc4b6Seschrock */ 79444eda4d7Smaybee if (db->db_blkid > dn->dn_maxblkid) 79544eda4d7Smaybee dn->dn_maxblkid = db->db_blkid; 796c717a561Smaybee dbuf_unoverride(dr); 797c717a561Smaybee } else { 798c717a561Smaybee /* 799c717a561Smaybee * This dbuf is not dirty in the open context. 800c717a561Smaybee * Either uncache it (if its not referenced in 801c717a561Smaybee * the open context) or reset its contents to 802c717a561Smaybee * empty. 803c717a561Smaybee */ 804c717a561Smaybee dbuf_fix_old_data(db, txg); 80544eda4d7Smaybee } 806c717a561Smaybee } 807c717a561Smaybee /* clear the contents if its cached */ 808ea8dc4b6Seschrock if (db->db_state == DB_CACHED) { 809ea8dc4b6Seschrock ASSERT(db->db.db_data != NULL); 810fa9e4066Sahrens arc_release(db->db_buf, db); 811fa9e4066Sahrens bzero(db->db.db_data, db->db.db_size); 8126b4acc8bSahrens arc_buf_freeze(db->db_buf); 813fa9e4066Sahrens } 814ea8dc4b6Seschrock 815fa9e4066Sahrens mutex_exit(&db->db_mtx); 816fa9e4066Sahrens } 817fa9e4066Sahrens mutex_exit(&dn->dn_dbufs_mtx); 818fa9e4066Sahrens } 819fa9e4066Sahrens 820fa9e4066Sahrens static int 8211934e92fSmaybee dbuf_block_freeable(dmu_buf_impl_t *db) 822fa9e4066Sahrens { 823fa9e4066Sahrens dsl_dataset_t *ds = db->db_objset->os_dsl_dataset; 824fa9e4066Sahrens uint64_t birth_txg = 0; 825fa9e4066Sahrens 826fa9e4066Sahrens /* 827fa9e4066Sahrens * We don't need any locking to protect db_blkptr: 828c717a561Smaybee * If it's syncing, then db_last_dirty will be set 829c717a561Smaybee * so we'll ignore db_blkptr. 830fa9e4066Sahrens */ 831c717a561Smaybee ASSERT(MUTEX_HELD(&db->db_mtx)); 832c717a561Smaybee if (db->db_last_dirty) 833c717a561Smaybee birth_txg = db->db_last_dirty->dr_txg; 834fa9e4066Sahrens else if (db->db_blkptr) 835fa9e4066Sahrens birth_txg = db->db_blkptr->blk_birth; 836fa9e4066Sahrens 8371934e92fSmaybee /* If we don't exist or are in a snapshot, we can't be freed */ 838fa9e4066Sahrens if (birth_txg) 8391934e92fSmaybee return (ds == NULL || 8401934e92fSmaybee dsl_dataset_block_freeable(ds, birth_txg)); 841fa9e4066Sahrens else 8421934e92fSmaybee return (FALSE); 843fa9e4066Sahrens } 844fa9e4066Sahrens 845fa9e4066Sahrens void 846fa9e4066Sahrens dbuf_new_size(dmu_buf_impl_t *db, int size, dmu_tx_t *tx) 847fa9e4066Sahrens { 848fa9e4066Sahrens arc_buf_t *buf, *obuf; 849fa9e4066Sahrens int osize = db->db.db_size; 850ad23a2dbSjohansen arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 851fa9e4066Sahrens 852ea8dc4b6Seschrock ASSERT(db->db_blkid != DB_BONUS_BLKID); 853ea8dc4b6Seschrock 854fa9e4066Sahrens /* XXX does *this* func really need the lock? */ 855fa9e4066Sahrens ASSERT(RW_WRITE_HELD(&db->db_dnode->dn_struct_rwlock)); 856fa9e4066Sahrens 857fa9e4066Sahrens /* 858fa9e4066Sahrens * This call to dbuf_will_dirty() with the dn_struct_rwlock held 859fa9e4066Sahrens * is OK, because there can be no other references to the db 860fa9e4066Sahrens * when we are changing its size, so no concurrent DB_FILL can 861fa9e4066Sahrens * be happening. 862fa9e4066Sahrens */ 863ea8dc4b6Seschrock /* 864ea8dc4b6Seschrock * XXX we should be doing a dbuf_read, checking the return 865ea8dc4b6Seschrock * value and returning that up to our callers 866ea8dc4b6Seschrock */ 867fa9e4066Sahrens dbuf_will_dirty(db, tx); 868fa9e4066Sahrens 869fa9e4066Sahrens /* create the data buffer for the new block */ 870ad23a2dbSjohansen buf = arc_buf_alloc(db->db_dnode->dn_objset->os_spa, size, db, type); 871fa9e4066Sahrens 872fa9e4066Sahrens /* copy old block data to the new block */ 873fa9e4066Sahrens obuf = db->db_buf; 874f65e61c0Sahrens bcopy(obuf->b_data, buf->b_data, MIN(osize, size)); 875fa9e4066Sahrens /* zero the remainder */ 876f65e61c0Sahrens if (size > osize) 877fa9e4066Sahrens bzero((uint8_t *)buf->b_data + osize, size - osize); 878fa9e4066Sahrens 879fa9e4066Sahrens mutex_enter(&db->db_mtx); 880fa9e4066Sahrens dbuf_set_data(db, buf); 881ea8dc4b6Seschrock VERIFY(arc_buf_remove_ref(obuf, db) == 1); 882fa9e4066Sahrens db->db.db_size = size; 883fa9e4066Sahrens 884c717a561Smaybee if (db->db_level == 0) { 885c717a561Smaybee ASSERT3U(db->db_last_dirty->dr_txg, ==, tx->tx_txg); 886c717a561Smaybee db->db_last_dirty->dt.dl.dr_data = buf; 887c717a561Smaybee } 888fa9e4066Sahrens mutex_exit(&db->db_mtx); 889fa9e4066Sahrens 890fa9e4066Sahrens dnode_willuse_space(db->db_dnode, size-osize, tx); 891fa9e4066Sahrens } 892fa9e4066Sahrens 893c717a561Smaybee dbuf_dirty_record_t * 894fa9e4066Sahrens dbuf_dirty(dmu_buf_impl_t *db, dmu_tx_t *tx) 895fa9e4066Sahrens { 896fa9e4066Sahrens dnode_t *dn = db->db_dnode; 897fa9e4066Sahrens objset_impl_t *os = dn->dn_objset; 898c717a561Smaybee dbuf_dirty_record_t **drp, *dr; 899fa9e4066Sahrens int drop_struct_lock = FALSE; 900d3469faaSMark Maybee boolean_t do_free_accounting = B_FALSE; 901fa9e4066Sahrens int txgoff = tx->tx_txg & TXG_MASK; 902fa9e4066Sahrens 903fa9e4066Sahrens ASSERT(tx->tx_txg != 0); 904fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 9059c9dc39aSek110237 DMU_TX_DIRTY_BUF(tx, db); 906fa9e4066Sahrens 907fa9e4066Sahrens /* 908fa9e4066Sahrens * Shouldn't dirty a regular buffer in syncing context. Private 909fa9e4066Sahrens * objects may be dirtied in syncing context, but only if they 910fa9e4066Sahrens * were already pre-dirtied in open context. 911fa9e4066Sahrens * XXX We may want to prohibit dirtying in syncing context even 912fa9e4066Sahrens * if they did pre-dirty. 913fa9e4066Sahrens */ 914c717a561Smaybee ASSERT(!dmu_tx_is_syncing(tx) || 915c717a561Smaybee BP_IS_HOLE(dn->dn_objset->os_rootbp) || 916c717a561Smaybee dn->dn_object == DMU_META_DNODE_OBJECT || 917c717a561Smaybee dn->dn_objset->os_dsl_dataset == NULL || 918c717a561Smaybee dsl_dir_is_private(dn->dn_objset->os_dsl_dataset->ds_dir)); 919fa9e4066Sahrens 920fa9e4066Sahrens /* 921fa9e4066Sahrens * We make this assert for private objects as well, but after we 922fa9e4066Sahrens * check if we're already dirty. They are allowed to re-dirty 923fa9e4066Sahrens * in syncing context. 924fa9e4066Sahrens */ 925ea8dc4b6Seschrock ASSERT(dn->dn_object == DMU_META_DNODE_OBJECT || 926c717a561Smaybee dn->dn_dirtyctx == DN_UNDIRTIED || dn->dn_dirtyctx == 927fa9e4066Sahrens (dmu_tx_is_syncing(tx) ? DN_DIRTY_SYNC : DN_DIRTY_OPEN)); 928fa9e4066Sahrens 929fa9e4066Sahrens mutex_enter(&db->db_mtx); 930fa9e4066Sahrens /* 931c717a561Smaybee * XXX make this true for indirects too? The problem is that 932c717a561Smaybee * transactions created with dmu_tx_create_assigned() from 933c717a561Smaybee * syncing context don't bother holding ahead. 934fa9e4066Sahrens */ 935c717a561Smaybee ASSERT(db->db_level != 0 || 93682c9918fSTim Haley db->db_state == DB_CACHED || db->db_state == DB_FILL || 93782c9918fSTim Haley db->db_state == DB_NOFILL); 938fa9e4066Sahrens 939fa9e4066Sahrens mutex_enter(&dn->dn_mtx); 940fa9e4066Sahrens /* 941fa9e4066Sahrens * Don't set dirtyctx to SYNC if we're just modifying this as we 942fa9e4066Sahrens * initialize the objset. 943fa9e4066Sahrens */ 944fa9e4066Sahrens if (dn->dn_dirtyctx == DN_UNDIRTIED && 945c717a561Smaybee !BP_IS_HOLE(dn->dn_objset->os_rootbp)) { 946fa9e4066Sahrens dn->dn_dirtyctx = 947fa9e4066Sahrens (dmu_tx_is_syncing(tx) ? DN_DIRTY_SYNC : DN_DIRTY_OPEN); 948fa9e4066Sahrens ASSERT(dn->dn_dirtyctx_firstset == NULL); 949fa9e4066Sahrens dn->dn_dirtyctx_firstset = kmem_alloc(1, KM_SLEEP); 950fa9e4066Sahrens } 951fa9e4066Sahrens mutex_exit(&dn->dn_mtx); 952fa9e4066Sahrens 953fa9e4066Sahrens /* 954fa9e4066Sahrens * If this buffer is already dirty, we're done. 955fa9e4066Sahrens */ 956c717a561Smaybee drp = &db->db_last_dirty; 957c717a561Smaybee ASSERT(*drp == NULL || (*drp)->dr_txg <= tx->tx_txg || 958c717a561Smaybee db->db.db_object == DMU_META_DNODE_OBJECT); 9597e2186e3Sbonwick while ((dr = *drp) != NULL && dr->dr_txg > tx->tx_txg) 9607e2186e3Sbonwick drp = &dr->dr_next; 9617e2186e3Sbonwick if (dr && dr->dr_txg == tx->tx_txg) { 962c717a561Smaybee if (db->db_level == 0 && db->db_blkid != DB_BONUS_BLKID) { 963c717a561Smaybee /* 964c717a561Smaybee * If this buffer has already been written out, 965c717a561Smaybee * we now need to reset its state. 966c717a561Smaybee */ 9677e2186e3Sbonwick dbuf_unoverride(dr); 968c717a561Smaybee if (db->db.db_object != DMU_META_DNODE_OBJECT) 9696b4acc8bSahrens arc_buf_thaw(db->db_buf); 970c717a561Smaybee } 971fa9e4066Sahrens mutex_exit(&db->db_mtx); 9727e2186e3Sbonwick return (dr); 973fa9e4066Sahrens } 974fa9e4066Sahrens 975fa9e4066Sahrens /* 976fa9e4066Sahrens * Only valid if not already dirty. 977fa9e4066Sahrens */ 978fa9e4066Sahrens ASSERT(dn->dn_dirtyctx == DN_UNDIRTIED || dn->dn_dirtyctx == 979fa9e4066Sahrens (dmu_tx_is_syncing(tx) ? DN_DIRTY_SYNC : DN_DIRTY_OPEN)); 980fa9e4066Sahrens 981fa9e4066Sahrens ASSERT3U(dn->dn_nlevels, >, db->db_level); 982fa9e4066Sahrens ASSERT((dn->dn_phys->dn_nlevels == 0 && db->db_level == 0) || 983fa9e4066Sahrens dn->dn_phys->dn_nlevels > db->db_level || 984fa9e4066Sahrens dn->dn_next_nlevels[txgoff] > db->db_level || 985fa9e4066Sahrens dn->dn_next_nlevels[(tx->tx_txg-1) & TXG_MASK] > db->db_level || 986fa9e4066Sahrens dn->dn_next_nlevels[(tx->tx_txg-2) & TXG_MASK] > db->db_level); 987fa9e4066Sahrens 988fa9e4066Sahrens /* 989fa9e4066Sahrens * We should only be dirtying in syncing context if it's the 990fa9e4066Sahrens * mos, a spa os, or we're initializing the os. However, we are 991fa9e4066Sahrens * allowed to dirty in syncing context provided we already 992fa9e4066Sahrens * dirtied it in open context. Hence we must make this 993fa9e4066Sahrens * assertion only if we're not already dirty. 994fa9e4066Sahrens */ 995fa9e4066Sahrens ASSERT(!dmu_tx_is_syncing(tx) || 996fa9e4066Sahrens os->os_dsl_dataset == NULL || 997fa9e4066Sahrens !dsl_dir_is_private(os->os_dsl_dataset->ds_dir) || 998c717a561Smaybee !BP_IS_HOLE(os->os_rootbp)); 999fa9e4066Sahrens ASSERT(db->db.db_size != 0); 1000fa9e4066Sahrens 1001fa9e4066Sahrens dprintf_dbuf(db, "size=%llx\n", (u_longlong_t)db->db.db_size); 1002fa9e4066Sahrens 10031934e92fSmaybee if (db->db_blkid != DB_BONUS_BLKID) { 10041934e92fSmaybee /* 10051934e92fSmaybee * Update the accounting. 1006d3469faaSMark Maybee * Note: we delay "free accounting" until after we drop 1007d3469faaSMark Maybee * the db_mtx. This keeps us from grabbing other locks 1008d3469faaSMark Maybee * (and possibly deadlocking) in bp_get_dasize() while 1009d3469faaSMark Maybee * also holding the db_mtx. 10101934e92fSmaybee */ 10111934e92fSmaybee dnode_willuse_space(dn, db->db.db_size, tx); 1012d3469faaSMark Maybee do_free_accounting = dbuf_block_freeable(db); 10131934e92fSmaybee } 10141934e92fSmaybee 1015ea8dc4b6Seschrock /* 1016ea8dc4b6Seschrock * If this buffer is dirty in an old transaction group we need 1017ea8dc4b6Seschrock * to make a copy of it so that the changes we make in this 1018ea8dc4b6Seschrock * transaction group won't leak out when we sync the older txg. 1019ea8dc4b6Seschrock */ 1020c717a561Smaybee dr = kmem_zalloc(sizeof (dbuf_dirty_record_t), KM_SLEEP); 1021c717a561Smaybee if (db->db_level == 0) { 1022c717a561Smaybee void *data_old = db->db_buf; 1023c717a561Smaybee 102482c9918fSTim Haley if (db->db_state != DB_NOFILL) { 1025ea8dc4b6Seschrock if (db->db_blkid == DB_BONUS_BLKID) { 1026c717a561Smaybee dbuf_fix_old_data(db, tx->tx_txg); 1027c717a561Smaybee data_old = db->db.db_data; 1028c717a561Smaybee } else if (db->db.db_object != DMU_META_DNODE_OBJECT) { 1029fa9e4066Sahrens /* 103082c9918fSTim Haley * Release the data buffer from the cache so 103182c9918fSTim Haley * that we can modify it without impacting 103282c9918fSTim Haley * possible other users of this cached data 103382c9918fSTim Haley * block. Note that indirect blocks and 103482c9918fSTim Haley * private objects are not released until the 103582c9918fSTim Haley * syncing state (since they are only modified 103682c9918fSTim Haley * then). 1037fa9e4066Sahrens */ 1038fa9e4066Sahrens arc_release(db->db_buf, db); 1039fa9e4066Sahrens dbuf_fix_old_data(db, tx->tx_txg); 1040c717a561Smaybee data_old = db->db_buf; 1041fa9e4066Sahrens } 1042c717a561Smaybee ASSERT(data_old != NULL); 104382c9918fSTim Haley } 1044c717a561Smaybee dr->dt.dl.dr_data = data_old; 1045c717a561Smaybee } else { 1046c717a561Smaybee mutex_init(&dr->dt.di.dr_mtx, NULL, MUTEX_DEFAULT, NULL); 1047c717a561Smaybee list_create(&dr->dt.di.dr_children, 1048c717a561Smaybee sizeof (dbuf_dirty_record_t), 1049c717a561Smaybee offsetof(dbuf_dirty_record_t, dr_dirty_node)); 1050fa9e4066Sahrens } 1051c717a561Smaybee dr->dr_dbuf = db; 1052c717a561Smaybee dr->dr_txg = tx->tx_txg; 1053c717a561Smaybee dr->dr_next = *drp; 1054c717a561Smaybee *drp = dr; 1055fa9e4066Sahrens 1056fa9e4066Sahrens /* 1057fa9e4066Sahrens * We could have been freed_in_flight between the dbuf_noread 1058fa9e4066Sahrens * and dbuf_dirty. We win, as though the dbuf_noread() had 1059fa9e4066Sahrens * happened after the free. 1060fa9e4066Sahrens */ 1061fa9e4066Sahrens if (db->db_level == 0 && db->db_blkid != DB_BONUS_BLKID) { 1062c717a561Smaybee mutex_enter(&dn->dn_mtx); 1063fa9e4066Sahrens dnode_clear_range(dn, db->db_blkid, 1, tx); 1064fa9e4066Sahrens mutex_exit(&dn->dn_mtx); 1065c717a561Smaybee db->db_freed_in_flight = FALSE; 1066c717a561Smaybee } 1067fa9e4066Sahrens 1068fa9e4066Sahrens /* 1069fa9e4066Sahrens * This buffer is now part of this txg 1070fa9e4066Sahrens */ 1071fa9e4066Sahrens dbuf_add_ref(db, (void *)(uintptr_t)tx->tx_txg); 1072fa9e4066Sahrens db->db_dirtycnt += 1; 1073fa9e4066Sahrens ASSERT3U(db->db_dirtycnt, <=, 3); 1074fa9e4066Sahrens 1075fa9e4066Sahrens mutex_exit(&db->db_mtx); 1076fa9e4066Sahrens 1077fa9e4066Sahrens if (db->db_blkid == DB_BONUS_BLKID) { 1078c717a561Smaybee mutex_enter(&dn->dn_mtx); 1079c717a561Smaybee ASSERT(!list_link_active(&dr->dr_dirty_node)); 1080c717a561Smaybee list_insert_tail(&dn->dn_dirty_records[txgoff], dr); 1081c717a561Smaybee mutex_exit(&dn->dn_mtx); 1082fa9e4066Sahrens dnode_setdirty(dn, tx); 1083c717a561Smaybee return (dr); 1084d3469faaSMark Maybee } else if (do_free_accounting) { 1085d3469faaSMark Maybee blkptr_t *bp = db->db_blkptr; 1086d3469faaSMark Maybee int64_t willfree = (bp && !BP_IS_HOLE(bp)) ? 1087d3469faaSMark Maybee bp_get_dasize(os->os_spa, bp) : db->db.db_size; 1088d3469faaSMark Maybee /* 1089d3469faaSMark Maybee * This is only a guess -- if the dbuf is dirty 1090d3469faaSMark Maybee * in a previous txg, we don't know how much 1091d3469faaSMark Maybee * space it will use on disk yet. We should 1092d3469faaSMark Maybee * really have the struct_rwlock to access 1093d3469faaSMark Maybee * db_blkptr, but since this is just a guess, 1094d3469faaSMark Maybee * it's OK if we get an odd answer. 1095d3469faaSMark Maybee */ 1096d3469faaSMark Maybee dnode_willuse_space(dn, -willfree, tx); 1097fa9e4066Sahrens } 1098fa9e4066Sahrens 1099fa9e4066Sahrens if (!RW_WRITE_HELD(&dn->dn_struct_rwlock)) { 1100fa9e4066Sahrens rw_enter(&dn->dn_struct_rwlock, RW_READER); 1101fa9e4066Sahrens drop_struct_lock = TRUE; 1102fa9e4066Sahrens } 1103fa9e4066Sahrens 11048346f03fSJonathan W Adams if (db->db_level == 0) { 11058346f03fSJonathan W Adams dnode_new_blkid(dn, db->db_blkid, tx, drop_struct_lock); 11068346f03fSJonathan W Adams ASSERT(dn->dn_maxblkid >= db->db_blkid); 11078346f03fSJonathan W Adams } 11088346f03fSJonathan W Adams 110944eda4d7Smaybee if (db->db_level+1 < dn->dn_nlevels) { 1110c717a561Smaybee dmu_buf_impl_t *parent = db->db_parent; 1111c717a561Smaybee dbuf_dirty_record_t *di; 1112c717a561Smaybee int parent_held = FALSE; 1113c717a561Smaybee 1114c717a561Smaybee if (db->db_parent == NULL || db->db_parent == dn->dn_dbuf) { 1115fa9e4066Sahrens int epbs = dn->dn_indblkshift - SPA_BLKPTRSHIFT; 1116c717a561Smaybee 1117fa9e4066Sahrens parent = dbuf_hold_level(dn, db->db_level+1, 1118fa9e4066Sahrens db->db_blkid >> epbs, FTAG); 1119c717a561Smaybee parent_held = TRUE; 1120c717a561Smaybee } 1121fa9e4066Sahrens if (drop_struct_lock) 1122fa9e4066Sahrens rw_exit(&dn->dn_struct_rwlock); 1123c717a561Smaybee ASSERT3U(db->db_level+1, ==, parent->db_level); 1124c717a561Smaybee di = dbuf_dirty(parent, tx); 1125c717a561Smaybee if (parent_held) 1126ea8dc4b6Seschrock dbuf_rele(parent, FTAG); 1127c717a561Smaybee 1128c717a561Smaybee mutex_enter(&db->db_mtx); 1129c717a561Smaybee /* possible race with dbuf_undirty() */ 1130c717a561Smaybee if (db->db_last_dirty == dr || 1131c717a561Smaybee dn->dn_object == DMU_META_DNODE_OBJECT) { 1132c717a561Smaybee mutex_enter(&di->dt.di.dr_mtx); 1133c717a561Smaybee ASSERT3U(di->dr_txg, ==, tx->tx_txg); 1134c717a561Smaybee ASSERT(!list_link_active(&dr->dr_dirty_node)); 1135c717a561Smaybee list_insert_tail(&di->dt.di.dr_children, dr); 1136c717a561Smaybee mutex_exit(&di->dt.di.dr_mtx); 1137c717a561Smaybee dr->dr_parent = di; 1138c717a561Smaybee } 1139c717a561Smaybee mutex_exit(&db->db_mtx); 1140fa9e4066Sahrens } else { 1141c717a561Smaybee ASSERT(db->db_level+1 == dn->dn_nlevels); 1142c717a561Smaybee ASSERT(db->db_blkid < dn->dn_nblkptr); 1143c717a561Smaybee ASSERT(db->db_parent == NULL || 1144c717a561Smaybee db->db_parent == db->db_dnode->dn_dbuf); 1145c717a561Smaybee mutex_enter(&dn->dn_mtx); 1146c717a561Smaybee ASSERT(!list_link_active(&dr->dr_dirty_node)); 1147c717a561Smaybee list_insert_tail(&dn->dn_dirty_records[txgoff], dr); 1148c717a561Smaybee mutex_exit(&dn->dn_mtx); 1149fa9e4066Sahrens if (drop_struct_lock) 1150fa9e4066Sahrens rw_exit(&dn->dn_struct_rwlock); 1151fa9e4066Sahrens } 1152fa9e4066Sahrens 1153fa9e4066Sahrens dnode_setdirty(dn, tx); 1154c717a561Smaybee return (dr); 1155fa9e4066Sahrens } 1156fa9e4066Sahrens 1157fa9e4066Sahrens static int 1158fa9e4066Sahrens dbuf_undirty(dmu_buf_impl_t *db, dmu_tx_t *tx) 1159fa9e4066Sahrens { 1160fa9e4066Sahrens dnode_t *dn = db->db_dnode; 1161c717a561Smaybee uint64_t txg = tx->tx_txg; 116217f17c2dSbonwick dbuf_dirty_record_t *dr, **drp; 1163fa9e4066Sahrens 1164c717a561Smaybee ASSERT(txg != 0); 1165ea8dc4b6Seschrock ASSERT(db->db_blkid != DB_BONUS_BLKID); 1166fa9e4066Sahrens 1167fa9e4066Sahrens mutex_enter(&db->db_mtx); 1168fa9e4066Sahrens 1169fa9e4066Sahrens /* 1170fa9e4066Sahrens * If this buffer is not dirty, we're done. 1171fa9e4066Sahrens */ 117217f17c2dSbonwick for (drp = &db->db_last_dirty; (dr = *drp) != NULL; drp = &dr->dr_next) 1173c717a561Smaybee if (dr->dr_txg <= txg) 1174c717a561Smaybee break; 1175c717a561Smaybee if (dr == NULL || dr->dr_txg < txg) { 1176fa9e4066Sahrens mutex_exit(&db->db_mtx); 1177fa9e4066Sahrens return (0); 1178fa9e4066Sahrens } 1179c717a561Smaybee ASSERT(dr->dr_txg == txg); 1180fa9e4066Sahrens 1181fa9e4066Sahrens /* 1182fa9e4066Sahrens * If this buffer is currently held, we cannot undirty 1183fa9e4066Sahrens * it, since one of the current holders may be in the 1184fa9e4066Sahrens * middle of an update. Note that users of dbuf_undirty() 1185fa9e4066Sahrens * should not place a hold on the dbuf before the call. 1186fa9e4066Sahrens */ 1187fa9e4066Sahrens if (refcount_count(&db->db_holds) > db->db_dirtycnt) { 1188fa9e4066Sahrens mutex_exit(&db->db_mtx); 118944eda4d7Smaybee /* Make sure we don't toss this buffer at sync phase */ 1190fa9e4066Sahrens mutex_enter(&dn->dn_mtx); 1191fa9e4066Sahrens dnode_clear_range(dn, db->db_blkid, 1, tx); 1192fa9e4066Sahrens mutex_exit(&dn->dn_mtx); 1193fa9e4066Sahrens return (0); 1194fa9e4066Sahrens } 1195fa9e4066Sahrens 1196fa9e4066Sahrens dprintf_dbuf(db, "size=%llx\n", (u_longlong_t)db->db.db_size); 1197fa9e4066Sahrens 1198fa9e4066Sahrens ASSERT(db->db.db_size != 0); 1199fa9e4066Sahrens 1200fa9e4066Sahrens /* XXX would be nice to fix up dn_towrite_space[] */ 1201fa9e4066Sahrens 120217f17c2dSbonwick *drp = dr->dr_next; 1203c717a561Smaybee 1204c717a561Smaybee if (dr->dr_parent) { 1205c717a561Smaybee mutex_enter(&dr->dr_parent->dt.di.dr_mtx); 1206c717a561Smaybee list_remove(&dr->dr_parent->dt.di.dr_children, dr); 1207c717a561Smaybee mutex_exit(&dr->dr_parent->dt.di.dr_mtx); 1208c717a561Smaybee } else if (db->db_level+1 == dn->dn_nlevels) { 1209cdb0ab79Smaybee ASSERT(db->db_blkptr == NULL || db->db_parent == dn->dn_dbuf); 1210fa9e4066Sahrens mutex_enter(&dn->dn_mtx); 1211c717a561Smaybee list_remove(&dn->dn_dirty_records[txg & TXG_MASK], dr); 1212fa9e4066Sahrens mutex_exit(&dn->dn_mtx); 1213c717a561Smaybee } 1214c717a561Smaybee 1215c717a561Smaybee if (db->db_level == 0) { 121682c9918fSTim Haley if (db->db_state != DB_NOFILL) { 1217c717a561Smaybee dbuf_unoverride(dr); 1218c717a561Smaybee 1219c717a561Smaybee ASSERT(db->db_buf != NULL); 1220c717a561Smaybee ASSERT(dr->dt.dl.dr_data != NULL); 1221c717a561Smaybee if (dr->dt.dl.dr_data != db->db_buf) 122282c9918fSTim Haley VERIFY(arc_buf_remove_ref(dr->dt.dl.dr_data, 122382c9918fSTim Haley db) == 1); 122482c9918fSTim Haley } 1225c717a561Smaybee } else { 1226c717a561Smaybee ASSERT(db->db_buf != NULL); 1227c717a561Smaybee ASSERT(list_head(&dr->dt.di.dr_children) == NULL); 1228c25056deSgw25295 mutex_destroy(&dr->dt.di.dr_mtx); 1229c25056deSgw25295 list_destroy(&dr->dt.di.dr_children); 1230c717a561Smaybee } 1231c717a561Smaybee kmem_free(dr, sizeof (dbuf_dirty_record_t)); 1232fa9e4066Sahrens 1233fa9e4066Sahrens ASSERT(db->db_dirtycnt > 0); 1234fa9e4066Sahrens db->db_dirtycnt -= 1; 1235fa9e4066Sahrens 1236c717a561Smaybee if (refcount_remove(&db->db_holds, (void *)(uintptr_t)txg) == 0) { 1237ea8dc4b6Seschrock arc_buf_t *buf = db->db_buf; 1238fa9e4066Sahrens 1239ea8dc4b6Seschrock ASSERT(arc_released(buf)); 1240ea8dc4b6Seschrock dbuf_set_data(db, NULL); 1241ea8dc4b6Seschrock VERIFY(arc_buf_remove_ref(buf, db) == 1); 1242fa9e4066Sahrens dbuf_evict(db); 1243fa9e4066Sahrens return (1); 1244fa9e4066Sahrens } 1245fa9e4066Sahrens 1246fa9e4066Sahrens mutex_exit(&db->db_mtx); 1247fa9e4066Sahrens return (0); 1248fa9e4066Sahrens } 1249fa9e4066Sahrens 1250fa9e4066Sahrens #pragma weak dmu_buf_will_dirty = dbuf_will_dirty 1251fa9e4066Sahrens void 1252fa9e4066Sahrens dbuf_will_dirty(dmu_buf_impl_t *db, dmu_tx_t *tx) 1253fa9e4066Sahrens { 12541ab7f2deSmaybee int rf = DB_RF_MUST_SUCCEED | DB_RF_NOPREFETCH; 1255fa9e4066Sahrens 1256fa9e4066Sahrens ASSERT(tx->tx_txg != 0); 1257fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 1258fa9e4066Sahrens 1259fa9e4066Sahrens if (RW_WRITE_HELD(&db->db_dnode->dn_struct_rwlock)) 1260fa9e4066Sahrens rf |= DB_RF_HAVESTRUCT; 1261ea8dc4b6Seschrock (void) dbuf_read(db, NULL, rf); 1262c717a561Smaybee (void) dbuf_dirty(db, tx); 1263fa9e4066Sahrens } 1264fa9e4066Sahrens 1265fa9e4066Sahrens void 126682c9918fSTim Haley dmu_buf_will_not_fill(dmu_buf_t *db_fake, dmu_tx_t *tx) 126782c9918fSTim Haley { 126882c9918fSTim Haley dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 126982c9918fSTim Haley 127082c9918fSTim Haley db->db_state = DB_NOFILL; 127182c9918fSTim Haley 127282c9918fSTim Haley dmu_buf_will_fill(db_fake, tx); 127382c9918fSTim Haley } 127482c9918fSTim Haley 127582c9918fSTim Haley void 1276ea8dc4b6Seschrock dmu_buf_will_fill(dmu_buf_t *db_fake, dmu_tx_t *tx) 1277fa9e4066Sahrens { 1278ea8dc4b6Seschrock dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 1279ea8dc4b6Seschrock 1280ea8dc4b6Seschrock ASSERT(db->db_blkid != DB_BONUS_BLKID); 1281fa9e4066Sahrens ASSERT(tx->tx_txg != 0); 1282fa9e4066Sahrens ASSERT(db->db_level == 0); 1283fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 1284fa9e4066Sahrens 1285ea8dc4b6Seschrock ASSERT(db->db.db_object != DMU_META_DNODE_OBJECT || 1286fa9e4066Sahrens dmu_tx_private_ok(tx)); 1287fa9e4066Sahrens 1288fa9e4066Sahrens dbuf_noread(db); 1289c717a561Smaybee (void) dbuf_dirty(db, tx); 1290fa9e4066Sahrens } 1291fa9e4066Sahrens 1292fa9e4066Sahrens #pragma weak dmu_buf_fill_done = dbuf_fill_done 1293fa9e4066Sahrens /* ARGSUSED */ 1294fa9e4066Sahrens void 1295fa9e4066Sahrens dbuf_fill_done(dmu_buf_impl_t *db, dmu_tx_t *tx) 1296fa9e4066Sahrens { 1297fa9e4066Sahrens mutex_enter(&db->db_mtx); 12989c9dc39aSek110237 DBUF_VERIFY(db); 1299fa9e4066Sahrens 1300fa9e4066Sahrens if (db->db_state == DB_FILL) { 1301c717a561Smaybee if (db->db_level == 0 && db->db_freed_in_flight) { 1302ea8dc4b6Seschrock ASSERT(db->db_blkid != DB_BONUS_BLKID); 1303fa9e4066Sahrens /* we were freed while filling */ 1304fa9e4066Sahrens /* XXX dbuf_undirty? */ 1305fa9e4066Sahrens bzero(db->db.db_data, db->db.db_size); 1306c717a561Smaybee db->db_freed_in_flight = FALSE; 1307fa9e4066Sahrens } 1308fa9e4066Sahrens db->db_state = DB_CACHED; 1309fa9e4066Sahrens cv_broadcast(&db->db_changed); 1310fa9e4066Sahrens } 1311fa9e4066Sahrens mutex_exit(&db->db_mtx); 1312fa9e4066Sahrens } 1313fa9e4066Sahrens 1314ea8dc4b6Seschrock /* 1315ea8dc4b6Seschrock * "Clear" the contents of this dbuf. This will mark the dbuf 1316ea8dc4b6Seschrock * EVICTING and clear *most* of its references. Unfortunetely, 1317ea8dc4b6Seschrock * when we are not holding the dn_dbufs_mtx, we can't clear the 1318ea8dc4b6Seschrock * entry in the dn_dbufs list. We have to wait until dbuf_destroy() 1319ea8dc4b6Seschrock * in this case. For callers from the DMU we will usually see: 1320ea8dc4b6Seschrock * dbuf_clear()->arc_buf_evict()->dbuf_do_evict()->dbuf_destroy() 1321ea8dc4b6Seschrock * For the arc callback, we will usually see: 1322ea8dc4b6Seschrock * dbuf_do_evict()->dbuf_clear();dbuf_destroy() 1323ea8dc4b6Seschrock * Sometimes, though, we will get a mix of these two: 1324ea8dc4b6Seschrock * DMU: dbuf_clear()->arc_buf_evict() 1325ea8dc4b6Seschrock * ARC: dbuf_do_evict()->dbuf_destroy() 1326ea8dc4b6Seschrock */ 1327ea8dc4b6Seschrock void 1328fa9e4066Sahrens dbuf_clear(dmu_buf_impl_t *db) 1329fa9e4066Sahrens { 1330fa9e4066Sahrens dnode_t *dn = db->db_dnode; 1331ea8dc4b6Seschrock dmu_buf_impl_t *parent = db->db_parent; 1332c543ec06Sahrens dmu_buf_impl_t *dndb = dn->dn_dbuf; 1333ea8dc4b6Seschrock int dbuf_gone = FALSE; 1334fa9e4066Sahrens 1335fa9e4066Sahrens ASSERT(MUTEX_HELD(&db->db_mtx)); 1336fa9e4066Sahrens ASSERT(refcount_is_zero(&db->db_holds)); 1337fa9e4066Sahrens 1338ea8dc4b6Seschrock dbuf_evict_user(db); 1339ea8dc4b6Seschrock 1340fa9e4066Sahrens if (db->db_state == DB_CACHED) { 1341ea8dc4b6Seschrock ASSERT(db->db.db_data != NULL); 13420e8c6158Smaybee if (db->db_blkid == DB_BONUS_BLKID) { 1343ea8dc4b6Seschrock zio_buf_free(db->db.db_data, DN_MAX_BONUSLEN); 13445a98e54bSBrendan Gregg - Sun Microsystems arc_space_return(DN_MAX_BONUSLEN, ARC_SPACE_OTHER); 13450e8c6158Smaybee } 1346fa9e4066Sahrens db->db.db_data = NULL; 1347fa9e4066Sahrens db->db_state = DB_UNCACHED; 1348fa9e4066Sahrens } 1349fa9e4066Sahrens 135082c9918fSTim Haley ASSERT(db->db_state == DB_UNCACHED || db->db_state == DB_NOFILL); 1351fa9e4066Sahrens ASSERT(db->db_data_pending == NULL); 1352fa9e4066Sahrens 1353ea8dc4b6Seschrock db->db_state = DB_EVICTING; 1354ea8dc4b6Seschrock db->db_blkptr = NULL; 1355ea8dc4b6Seschrock 1356ea8dc4b6Seschrock if (db->db_blkid != DB_BONUS_BLKID && MUTEX_HELD(&dn->dn_dbufs_mtx)) { 1357ea8dc4b6Seschrock list_remove(&dn->dn_dbufs, db); 1358ea8dc4b6Seschrock dnode_rele(dn, db); 13591934e92fSmaybee db->db_dnode = NULL; 1360ea8dc4b6Seschrock } 1361ea8dc4b6Seschrock 1362ea8dc4b6Seschrock if (db->db_buf) 1363ea8dc4b6Seschrock dbuf_gone = arc_buf_evict(db->db_buf); 1364ea8dc4b6Seschrock 1365ea8dc4b6Seschrock if (!dbuf_gone) 1366fa9e4066Sahrens mutex_exit(&db->db_mtx); 1367fa9e4066Sahrens 1368fa9e4066Sahrens /* 1369fa9e4066Sahrens * If this dbuf is referened from an indirect dbuf, 1370fa9e4066Sahrens * decrement the ref count on the indirect dbuf. 1371fa9e4066Sahrens */ 1372c543ec06Sahrens if (parent && parent != dndb) 1373ea8dc4b6Seschrock dbuf_rele(parent, db); 1374fa9e4066Sahrens } 1375fa9e4066Sahrens 1376fa9e4066Sahrens static int 1377fa9e4066Sahrens dbuf_findbp(dnode_t *dn, int level, uint64_t blkid, int fail_sparse, 1378fa9e4066Sahrens dmu_buf_impl_t **parentp, blkptr_t **bpp) 1379fa9e4066Sahrens { 1380fa9e4066Sahrens int nlevels, epbs; 1381fa9e4066Sahrens 13820b69c2f0Sahrens *parentp = NULL; 13830b69c2f0Sahrens *bpp = NULL; 13840b69c2f0Sahrens 1385ea8dc4b6Seschrock ASSERT(blkid != DB_BONUS_BLKID); 1386ea8dc4b6Seschrock 1387fa9e4066Sahrens if (dn->dn_phys->dn_nlevels == 0) 1388fa9e4066Sahrens nlevels = 1; 1389fa9e4066Sahrens else 1390fa9e4066Sahrens nlevels = dn->dn_phys->dn_nlevels; 1391fa9e4066Sahrens 1392fa9e4066Sahrens epbs = dn->dn_indblkshift - SPA_BLKPTRSHIFT; 1393fa9e4066Sahrens 1394fa9e4066Sahrens ASSERT3U(level * epbs, <, 64); 1395fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 1396ea8dc4b6Seschrock if (level >= nlevels || 1397fa9e4066Sahrens (blkid > (dn->dn_phys->dn_maxblkid >> (level * epbs)))) { 1398fa9e4066Sahrens /* the buffer has no parent yet */ 1399fa9e4066Sahrens return (ENOENT); 1400fa9e4066Sahrens } else if (level < nlevels-1) { 1401fa9e4066Sahrens /* this block is referenced from an indirect block */ 1402fa9e4066Sahrens int err = dbuf_hold_impl(dn, level+1, 1403fa9e4066Sahrens blkid >> epbs, fail_sparse, NULL, parentp); 1404fa9e4066Sahrens if (err) 1405fa9e4066Sahrens return (err); 1406ea8dc4b6Seschrock err = dbuf_read(*parentp, NULL, 1407ea8dc4b6Seschrock (DB_RF_HAVESTRUCT | DB_RF_NOPREFETCH | DB_RF_CANFAIL)); 1408c543ec06Sahrens if (err) { 1409c543ec06Sahrens dbuf_rele(*parentp, NULL); 1410c543ec06Sahrens *parentp = NULL; 1411c543ec06Sahrens return (err); 1412c543ec06Sahrens } 1413fa9e4066Sahrens *bpp = ((blkptr_t *)(*parentp)->db.db_data) + 1414fa9e4066Sahrens (blkid & ((1ULL << epbs) - 1)); 1415c543ec06Sahrens return (0); 1416fa9e4066Sahrens } else { 1417fa9e4066Sahrens /* the block is referenced from the dnode */ 1418fa9e4066Sahrens ASSERT3U(level, ==, nlevels-1); 1419fa9e4066Sahrens ASSERT(dn->dn_phys->dn_nblkptr == 0 || 1420fa9e4066Sahrens blkid < dn->dn_phys->dn_nblkptr); 1421c543ec06Sahrens if (dn->dn_dbuf) { 1422c543ec06Sahrens dbuf_add_ref(dn->dn_dbuf, NULL); 1423fa9e4066Sahrens *parentp = dn->dn_dbuf; 1424c543ec06Sahrens } 1425fa9e4066Sahrens *bpp = &dn->dn_phys->dn_blkptr[blkid]; 1426fa9e4066Sahrens return (0); 1427fa9e4066Sahrens } 1428fa9e4066Sahrens } 1429fa9e4066Sahrens 1430fa9e4066Sahrens static dmu_buf_impl_t * 1431fa9e4066Sahrens dbuf_create(dnode_t *dn, uint8_t level, uint64_t blkid, 1432fa9e4066Sahrens dmu_buf_impl_t *parent, blkptr_t *blkptr) 1433fa9e4066Sahrens { 1434fa9e4066Sahrens objset_impl_t *os = dn->dn_objset; 1435fa9e4066Sahrens dmu_buf_impl_t *db, *odb; 1436fa9e4066Sahrens 1437fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 1438fa9e4066Sahrens ASSERT(dn->dn_type != DMU_OT_NONE); 1439fa9e4066Sahrens 1440fa9e4066Sahrens db = kmem_cache_alloc(dbuf_cache, KM_SLEEP); 1441fa9e4066Sahrens 1442fa9e4066Sahrens db->db_objset = os; 1443fa9e4066Sahrens db->db.db_object = dn->dn_object; 1444fa9e4066Sahrens db->db_level = level; 1445fa9e4066Sahrens db->db_blkid = blkid; 1446c717a561Smaybee db->db_last_dirty = NULL; 1447ea8dc4b6Seschrock db->db_dirtycnt = 0; 1448ea8dc4b6Seschrock db->db_dnode = dn; 1449ea8dc4b6Seschrock db->db_parent = parent; 1450ea8dc4b6Seschrock db->db_blkptr = blkptr; 1451fa9e4066Sahrens 1452c717a561Smaybee db->db_user_ptr = NULL; 1453c717a561Smaybee db->db_user_data_ptr_ptr = NULL; 1454c717a561Smaybee db->db_evict_func = NULL; 1455c717a561Smaybee db->db_immediate_evict = 0; 1456c717a561Smaybee db->db_freed_in_flight = 0; 1457ea8dc4b6Seschrock 1458ea8dc4b6Seschrock if (blkid == DB_BONUS_BLKID) { 1459ea8dc4b6Seschrock ASSERT3P(parent, ==, dn->dn_dbuf); 14601934e92fSmaybee db->db.db_size = DN_MAX_BONUSLEN - 14611934e92fSmaybee (dn->dn_nblkptr-1) * sizeof (blkptr_t); 14621934e92fSmaybee ASSERT3U(db->db.db_size, >=, dn->dn_bonuslen); 1463fa9e4066Sahrens db->db.db_offset = DB_BONUS_BLKID; 1464ea8dc4b6Seschrock db->db_state = DB_UNCACHED; 1465ea8dc4b6Seschrock /* the bonus dbuf is not placed in the hash table */ 14665a98e54bSBrendan Gregg - Sun Microsystems arc_space_consume(sizeof (dmu_buf_impl_t), ARC_SPACE_OTHER); 1467ea8dc4b6Seschrock return (db); 1468fa9e4066Sahrens } else { 1469fa9e4066Sahrens int blocksize = 1470fa9e4066Sahrens db->db_level ? 1<<dn->dn_indblkshift : dn->dn_datablksz; 1471fa9e4066Sahrens db->db.db_size = blocksize; 1472fa9e4066Sahrens db->db.db_offset = db->db_blkid * blocksize; 1473fa9e4066Sahrens } 1474fa9e4066Sahrens 1475fa9e4066Sahrens /* 1476fa9e4066Sahrens * Hold the dn_dbufs_mtx while we get the new dbuf 1477fa9e4066Sahrens * in the hash table *and* added to the dbufs list. 1478fa9e4066Sahrens * This prevents a possible deadlock with someone 1479fa9e4066Sahrens * trying to look up this dbuf before its added to the 1480fa9e4066Sahrens * dn_dbufs list. 1481fa9e4066Sahrens */ 1482fa9e4066Sahrens mutex_enter(&dn->dn_dbufs_mtx); 1483ea8dc4b6Seschrock db->db_state = DB_EVICTING; 1484fa9e4066Sahrens if ((odb = dbuf_hash_insert(db)) != NULL) { 1485fa9e4066Sahrens /* someone else inserted it first */ 1486fa9e4066Sahrens kmem_cache_free(dbuf_cache, db); 1487fa9e4066Sahrens mutex_exit(&dn->dn_dbufs_mtx); 1488fa9e4066Sahrens return (odb); 1489fa9e4066Sahrens } 1490fa9e4066Sahrens list_insert_head(&dn->dn_dbufs, db); 1491ea8dc4b6Seschrock db->db_state = DB_UNCACHED; 1492fa9e4066Sahrens mutex_exit(&dn->dn_dbufs_mtx); 14935a98e54bSBrendan Gregg - Sun Microsystems arc_space_consume(sizeof (dmu_buf_impl_t), ARC_SPACE_OTHER); 1494fa9e4066Sahrens 1495fa9e4066Sahrens if (parent && parent != dn->dn_dbuf) 1496fa9e4066Sahrens dbuf_add_ref(parent, db); 1497fa9e4066Sahrens 1498ea8dc4b6Seschrock ASSERT(dn->dn_object == DMU_META_DNODE_OBJECT || 1499ea8dc4b6Seschrock refcount_count(&dn->dn_holds) > 0); 1500fa9e4066Sahrens (void) refcount_add(&dn->dn_holds, db); 1501fa9e4066Sahrens 1502fa9e4066Sahrens dprintf_dbuf(db, "db=%p\n", db); 1503fa9e4066Sahrens 1504fa9e4066Sahrens return (db); 1505fa9e4066Sahrens } 1506fa9e4066Sahrens 1507fa9e4066Sahrens static int 1508ea8dc4b6Seschrock dbuf_do_evict(void *private) 1509fa9e4066Sahrens { 1510ea8dc4b6Seschrock arc_buf_t *buf = private; 1511ea8dc4b6Seschrock dmu_buf_impl_t *db = buf->b_private; 1512fa9e4066Sahrens 1513ea8dc4b6Seschrock if (!MUTEX_HELD(&db->db_mtx)) 1514ea8dc4b6Seschrock mutex_enter(&db->db_mtx); 1515ea8dc4b6Seschrock 1516ea8dc4b6Seschrock ASSERT(refcount_is_zero(&db->db_holds)); 1517ea8dc4b6Seschrock 1518ea8dc4b6Seschrock if (db->db_state != DB_EVICTING) { 1519ea8dc4b6Seschrock ASSERT(db->db_state == DB_CACHED); 15209c9dc39aSek110237 DBUF_VERIFY(db); 1521ea8dc4b6Seschrock db->db_buf = NULL; 1522ea8dc4b6Seschrock dbuf_evict(db); 1523ea8dc4b6Seschrock } else { 1524ea8dc4b6Seschrock mutex_exit(&db->db_mtx); 1525ea8dc4b6Seschrock dbuf_destroy(db); 1526fa9e4066Sahrens } 1527ea8dc4b6Seschrock return (0); 1528fa9e4066Sahrens } 1529fa9e4066Sahrens 1530fa9e4066Sahrens static void 1531fa9e4066Sahrens dbuf_destroy(dmu_buf_impl_t *db) 1532fa9e4066Sahrens { 1533fa9e4066Sahrens ASSERT(refcount_is_zero(&db->db_holds)); 1534fa9e4066Sahrens 1535ea8dc4b6Seschrock if (db->db_blkid != DB_BONUS_BLKID) { 1536ea8dc4b6Seschrock /* 1537ea8dc4b6Seschrock * If this dbuf is still on the dn_dbufs list, 1538ea8dc4b6Seschrock * remove it from that list. 1539ea8dc4b6Seschrock */ 15401934e92fSmaybee if (db->db_dnode) { 15411934e92fSmaybee dnode_t *dn = db->db_dnode; 15421934e92fSmaybee 15431934e92fSmaybee mutex_enter(&dn->dn_dbufs_mtx); 1544ea8dc4b6Seschrock list_remove(&dn->dn_dbufs, db); 1545ea8dc4b6Seschrock mutex_exit(&dn->dn_dbufs_mtx); 1546ea8dc4b6Seschrock 1547ea8dc4b6Seschrock dnode_rele(dn, db); 15481934e92fSmaybee db->db_dnode = NULL; 1549ea8dc4b6Seschrock } 1550ea8dc4b6Seschrock dbuf_hash_remove(db); 1551ea8dc4b6Seschrock } 1552ea8dc4b6Seschrock db->db_parent = NULL; 1553ea8dc4b6Seschrock db->db_buf = NULL; 1554ea8dc4b6Seschrock 1555f82bfe17Sgw25295 ASSERT(!list_link_active(&db->db_link)); 1556fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 1557fa9e4066Sahrens ASSERT(db->db_hash_next == NULL); 1558fa9e4066Sahrens ASSERT(db->db_blkptr == NULL); 1559fa9e4066Sahrens ASSERT(db->db_data_pending == NULL); 1560fa9e4066Sahrens 1561fa9e4066Sahrens kmem_cache_free(dbuf_cache, db); 15625a98e54bSBrendan Gregg - Sun Microsystems arc_space_return(sizeof (dmu_buf_impl_t), ARC_SPACE_OTHER); 1563fa9e4066Sahrens } 1564fa9e4066Sahrens 1565fa9e4066Sahrens void 1566fa9e4066Sahrens dbuf_prefetch(dnode_t *dn, uint64_t blkid) 1567fa9e4066Sahrens { 156813506d1eSmaybee dmu_buf_impl_t *db = NULL; 1569fa9e4066Sahrens blkptr_t *bp = NULL; 1570fa9e4066Sahrens 1571fa9e4066Sahrens ASSERT(blkid != DB_BONUS_BLKID); 1572fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 1573fa9e4066Sahrens 1574fa9e4066Sahrens if (dnode_block_freed(dn, blkid)) 1575fa9e4066Sahrens return; 1576fa9e4066Sahrens 1577fa9e4066Sahrens /* dbuf_find() returns with db_mtx held */ 1578fa9e4066Sahrens if (db = dbuf_find(dn, 0, blkid)) { 157913506d1eSmaybee if (refcount_count(&db->db_holds) > 0) { 1580fa9e4066Sahrens /* 158113506d1eSmaybee * This dbuf is active. We assume that it is 158213506d1eSmaybee * already CACHED, or else about to be either 1583fa9e4066Sahrens * read or filled. 1584fa9e4066Sahrens */ 1585fa9e4066Sahrens mutex_exit(&db->db_mtx); 1586fa9e4066Sahrens return; 1587fa9e4066Sahrens } 158813506d1eSmaybee mutex_exit(&db->db_mtx); 15890b69c2f0Sahrens db = NULL; 159013506d1eSmaybee } 1591fa9e4066Sahrens 159213506d1eSmaybee if (dbuf_findbp(dn, 0, blkid, TRUE, &db, &bp) == 0) { 1593fa9e4066Sahrens if (bp && !BP_IS_HOLE(bp)) { 1594088f3894Sahrens arc_buf_t *pbuf; 159513506d1eSmaybee uint32_t aflags = ARC_NOWAIT | ARC_PREFETCH; 1596ea8dc4b6Seschrock zbookmark_t zb; 1597ea8dc4b6Seschrock zb.zb_objset = dn->dn_objset->os_dsl_dataset ? 1598ea8dc4b6Seschrock dn->dn_objset->os_dsl_dataset->ds_object : 0; 1599ea8dc4b6Seschrock zb.zb_object = dn->dn_object; 1600ea8dc4b6Seschrock zb.zb_level = 0; 1601ea8dc4b6Seschrock zb.zb_blkid = blkid; 1602ea8dc4b6Seschrock 1603088f3894Sahrens if (db) 1604088f3894Sahrens pbuf = db->db_buf; 1605088f3894Sahrens else 1606088f3894Sahrens pbuf = dn->dn_objset->os_phys_buf; 1607088f3894Sahrens 1608088f3894Sahrens (void) arc_read(NULL, dn->dn_objset->os_spa, 1609088f3894Sahrens bp, pbuf, NULL, NULL, ZIO_PRIORITY_ASYNC_READ, 1610fa9e4066Sahrens ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE, 161113506d1eSmaybee &aflags, &zb); 1612fa9e4066Sahrens } 161313506d1eSmaybee if (db) 161413506d1eSmaybee dbuf_rele(db, NULL); 1615fa9e4066Sahrens } 1616fa9e4066Sahrens } 1617fa9e4066Sahrens 1618fa9e4066Sahrens /* 1619fa9e4066Sahrens * Returns with db_holds incremented, and db_mtx not held. 1620fa9e4066Sahrens * Note: dn_struct_rwlock must be held. 1621fa9e4066Sahrens */ 1622fa9e4066Sahrens int 1623fa9e4066Sahrens dbuf_hold_impl(dnode_t *dn, uint8_t level, uint64_t blkid, int fail_sparse, 1624fa9e4066Sahrens void *tag, dmu_buf_impl_t **dbp) 1625fa9e4066Sahrens { 1626fa9e4066Sahrens dmu_buf_impl_t *db, *parent = NULL; 1627fa9e4066Sahrens 1628ea8dc4b6Seschrock ASSERT(blkid != DB_BONUS_BLKID); 1629fa9e4066Sahrens ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock)); 1630fa9e4066Sahrens ASSERT3U(dn->dn_nlevels, >, level); 1631fa9e4066Sahrens 1632fa9e4066Sahrens *dbp = NULL; 1633ea8dc4b6Seschrock top: 1634fa9e4066Sahrens /* dbuf_find() returns with db_mtx held */ 1635fa9e4066Sahrens db = dbuf_find(dn, level, blkid); 1636fa9e4066Sahrens 1637fa9e4066Sahrens if (db == NULL) { 1638fa9e4066Sahrens blkptr_t *bp = NULL; 1639fa9e4066Sahrens int err; 1640fa9e4066Sahrens 1641c543ec06Sahrens ASSERT3P(parent, ==, NULL); 1642fa9e4066Sahrens err = dbuf_findbp(dn, level, blkid, fail_sparse, &parent, &bp); 1643fa9e4066Sahrens if (fail_sparse) { 1644fa9e4066Sahrens if (err == 0 && bp && BP_IS_HOLE(bp)) 1645fa9e4066Sahrens err = ENOENT; 1646fa9e4066Sahrens if (err) { 1647c543ec06Sahrens if (parent) 1648ea8dc4b6Seschrock dbuf_rele(parent, NULL); 1649fa9e4066Sahrens return (err); 1650fa9e4066Sahrens } 1651fa9e4066Sahrens } 1652ea8dc4b6Seschrock if (err && err != ENOENT) 1653ea8dc4b6Seschrock return (err); 1654fa9e4066Sahrens db = dbuf_create(dn, level, blkid, parent, bp); 1655fa9e4066Sahrens } 1656fa9e4066Sahrens 1657ea8dc4b6Seschrock if (db->db_buf && refcount_is_zero(&db->db_holds)) { 1658ea8dc4b6Seschrock arc_buf_add_ref(db->db_buf, db); 1659ea8dc4b6Seschrock if (db->db_buf->b_data == NULL) { 1660ea8dc4b6Seschrock dbuf_clear(db); 1661c543ec06Sahrens if (parent) { 1662c543ec06Sahrens dbuf_rele(parent, NULL); 1663c543ec06Sahrens parent = NULL; 1664c543ec06Sahrens } 1665ea8dc4b6Seschrock goto top; 1666ea8dc4b6Seschrock } 1667ea8dc4b6Seschrock ASSERT3P(db->db.db_data, ==, db->db_buf->b_data); 1668ea8dc4b6Seschrock } 1669ea8dc4b6Seschrock 1670ea8dc4b6Seschrock ASSERT(db->db_buf == NULL || arc_referenced(db->db_buf)); 1671ea8dc4b6Seschrock 1672fa9e4066Sahrens /* 1673c717a561Smaybee * If this buffer is currently syncing out, and we are are 1674c717a561Smaybee * still referencing it from db_data, we need to make a copy 1675c717a561Smaybee * of it in case we decide we want to dirty it again in this txg. 1676fa9e4066Sahrens */ 1677c717a561Smaybee if (db->db_level == 0 && db->db_blkid != DB_BONUS_BLKID && 1678ea8dc4b6Seschrock dn->dn_object != DMU_META_DNODE_OBJECT && 1679c717a561Smaybee db->db_state == DB_CACHED && db->db_data_pending) { 1680c717a561Smaybee dbuf_dirty_record_t *dr = db->db_data_pending; 1681c717a561Smaybee 1682c717a561Smaybee if (dr->dt.dl.dr_data == db->db_buf) { 1683ad23a2dbSjohansen arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 1684fa9e4066Sahrens 1685c717a561Smaybee dbuf_set_data(db, 1686c717a561Smaybee arc_buf_alloc(db->db_dnode->dn_objset->os_spa, 1687c717a561Smaybee db->db.db_size, db, type)); 1688c717a561Smaybee bcopy(dr->dt.dl.dr_data->b_data, db->db.db_data, 1689fa9e4066Sahrens db->db.db_size); 1690fa9e4066Sahrens } 1691c717a561Smaybee } 1692fa9e4066Sahrens 1693ea8dc4b6Seschrock (void) refcount_add(&db->db_holds, tag); 1694fa9e4066Sahrens dbuf_update_data(db); 16959c9dc39aSek110237 DBUF_VERIFY(db); 1696fa9e4066Sahrens mutex_exit(&db->db_mtx); 1697fa9e4066Sahrens 1698fa9e4066Sahrens /* NOTE: we can't rele the parent until after we drop the db_mtx */ 1699c543ec06Sahrens if (parent) 1700ea8dc4b6Seschrock dbuf_rele(parent, NULL); 1701fa9e4066Sahrens 1702fa9e4066Sahrens ASSERT3P(db->db_dnode, ==, dn); 1703fa9e4066Sahrens ASSERT3U(db->db_blkid, ==, blkid); 1704fa9e4066Sahrens ASSERT3U(db->db_level, ==, level); 1705fa9e4066Sahrens *dbp = db; 1706fa9e4066Sahrens 1707fa9e4066Sahrens return (0); 1708fa9e4066Sahrens } 1709fa9e4066Sahrens 1710fa9e4066Sahrens dmu_buf_impl_t * 1711ea8dc4b6Seschrock dbuf_hold(dnode_t *dn, uint64_t blkid, void *tag) 1712fa9e4066Sahrens { 1713fa9e4066Sahrens dmu_buf_impl_t *db; 1714ea8dc4b6Seschrock int err = dbuf_hold_impl(dn, 0, blkid, FALSE, tag, &db); 1715ea8dc4b6Seschrock return (err ? NULL : db); 1716fa9e4066Sahrens } 1717fa9e4066Sahrens 1718fa9e4066Sahrens dmu_buf_impl_t * 1719fa9e4066Sahrens dbuf_hold_level(dnode_t *dn, int level, uint64_t blkid, void *tag) 1720fa9e4066Sahrens { 1721fa9e4066Sahrens dmu_buf_impl_t *db; 1722ea8dc4b6Seschrock int err = dbuf_hold_impl(dn, level, blkid, FALSE, tag, &db); 1723ea8dc4b6Seschrock return (err ? NULL : db); 1724fa9e4066Sahrens } 1725fa9e4066Sahrens 17261934e92fSmaybee void 1727ea8dc4b6Seschrock dbuf_create_bonus(dnode_t *dn) 1728fa9e4066Sahrens { 1729ea8dc4b6Seschrock ASSERT(RW_WRITE_HELD(&dn->dn_struct_rwlock)); 1730ea8dc4b6Seschrock 1731ea8dc4b6Seschrock ASSERT(dn->dn_bonus == NULL); 17321934e92fSmaybee dn->dn_bonus = dbuf_create(dn, 0, DB_BONUS_BLKID, dn->dn_dbuf, NULL); 1733fa9e4066Sahrens } 1734fa9e4066Sahrens 1735ea8dc4b6Seschrock #pragma weak dmu_buf_add_ref = dbuf_add_ref 1736fa9e4066Sahrens void 1737fa9e4066Sahrens dbuf_add_ref(dmu_buf_impl_t *db, void *tag) 1738fa9e4066Sahrens { 1739ea8dc4b6Seschrock int64_t holds = refcount_add(&db->db_holds, tag); 1740ea8dc4b6Seschrock ASSERT(holds > 1); 1741fa9e4066Sahrens } 1742fa9e4066Sahrens 1743ea8dc4b6Seschrock #pragma weak dmu_buf_rele = dbuf_rele 1744fa9e4066Sahrens void 1745ea8dc4b6Seschrock dbuf_rele(dmu_buf_impl_t *db, void *tag) 1746fa9e4066Sahrens { 1747fa9e4066Sahrens int64_t holds; 1748fa9e4066Sahrens 1749fa9e4066Sahrens mutex_enter(&db->db_mtx); 17509c9dc39aSek110237 DBUF_VERIFY(db); 1751fa9e4066Sahrens 1752fa9e4066Sahrens holds = refcount_remove(&db->db_holds, tag); 1753ea8dc4b6Seschrock ASSERT(holds >= 0); 1754fa9e4066Sahrens 1755c717a561Smaybee /* 1756c717a561Smaybee * We can't freeze indirects if there is a possibility that they 1757c717a561Smaybee * may be modified in the current syncing context. 1758c717a561Smaybee */ 1759c717a561Smaybee if (db->db_buf && holds == (db->db_level == 0 ? db->db_dirtycnt : 0)) 17606b4acc8bSahrens arc_buf_freeze(db->db_buf); 17616b4acc8bSahrens 1762fa9e4066Sahrens if (holds == db->db_dirtycnt && 1763c717a561Smaybee db->db_level == 0 && db->db_immediate_evict) 1764fa9e4066Sahrens dbuf_evict_user(db); 1765ea8dc4b6Seschrock 1766ea8dc4b6Seschrock if (holds == 0) { 1767ea8dc4b6Seschrock if (db->db_blkid == DB_BONUS_BLKID) { 1768ea8dc4b6Seschrock mutex_exit(&db->db_mtx); 1769ea8dc4b6Seschrock dnode_rele(db->db_dnode, db); 1770ea8dc4b6Seschrock } else if (db->db_buf == NULL) { 1771ea8dc4b6Seschrock /* 1772ea8dc4b6Seschrock * This is a special case: we never associated this 1773ea8dc4b6Seschrock * dbuf with any data allocated from the ARC. 1774ea8dc4b6Seschrock */ 177582c9918fSTim Haley ASSERT(db->db_state == DB_UNCACHED || 177682c9918fSTim Haley db->db_state == DB_NOFILL); 1777ea8dc4b6Seschrock dbuf_evict(db); 1778ea8dc4b6Seschrock } else if (arc_released(db->db_buf)) { 1779ea8dc4b6Seschrock arc_buf_t *buf = db->db_buf; 1780ea8dc4b6Seschrock /* 1781ea8dc4b6Seschrock * This dbuf has anonymous data associated with it. 1782ea8dc4b6Seschrock */ 1783ea8dc4b6Seschrock dbuf_set_data(db, NULL); 1784ea8dc4b6Seschrock VERIFY(arc_buf_remove_ref(buf, db) == 1); 1785ea8dc4b6Seschrock dbuf_evict(db); 1786ea8dc4b6Seschrock } else { 1787ea8dc4b6Seschrock VERIFY(arc_buf_remove_ref(db->db_buf, db) == 0); 17883baa08fcSek110237 if (!DBUF_IS_CACHEABLE(db)) 17893baa08fcSek110237 dbuf_clear(db); 17903baa08fcSek110237 else 1791fa9e4066Sahrens mutex_exit(&db->db_mtx); 1792fa9e4066Sahrens } 1793ea8dc4b6Seschrock } else { 1794ea8dc4b6Seschrock mutex_exit(&db->db_mtx); 1795fa9e4066Sahrens } 1796fa9e4066Sahrens } 1797fa9e4066Sahrens 1798fa9e4066Sahrens #pragma weak dmu_buf_refcount = dbuf_refcount 1799fa9e4066Sahrens uint64_t 1800fa9e4066Sahrens dbuf_refcount(dmu_buf_impl_t *db) 1801fa9e4066Sahrens { 1802fa9e4066Sahrens return (refcount_count(&db->db_holds)); 1803fa9e4066Sahrens } 1804fa9e4066Sahrens 1805fa9e4066Sahrens void * 1806fa9e4066Sahrens dmu_buf_set_user(dmu_buf_t *db_fake, void *user_ptr, void *user_data_ptr_ptr, 1807fa9e4066Sahrens dmu_buf_evict_func_t *evict_func) 1808fa9e4066Sahrens { 1809fa9e4066Sahrens return (dmu_buf_update_user(db_fake, NULL, user_ptr, 1810fa9e4066Sahrens user_data_ptr_ptr, evict_func)); 1811fa9e4066Sahrens } 1812fa9e4066Sahrens 1813fa9e4066Sahrens void * 1814fa9e4066Sahrens dmu_buf_set_user_ie(dmu_buf_t *db_fake, void *user_ptr, void *user_data_ptr_ptr, 1815fa9e4066Sahrens dmu_buf_evict_func_t *evict_func) 1816fa9e4066Sahrens { 1817fa9e4066Sahrens dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 1818fa9e4066Sahrens 1819c717a561Smaybee db->db_immediate_evict = TRUE; 1820fa9e4066Sahrens return (dmu_buf_update_user(db_fake, NULL, user_ptr, 1821fa9e4066Sahrens user_data_ptr_ptr, evict_func)); 1822fa9e4066Sahrens } 1823fa9e4066Sahrens 1824fa9e4066Sahrens void * 1825fa9e4066Sahrens dmu_buf_update_user(dmu_buf_t *db_fake, void *old_user_ptr, void *user_ptr, 1826fa9e4066Sahrens void *user_data_ptr_ptr, dmu_buf_evict_func_t *evict_func) 1827fa9e4066Sahrens { 1828fa9e4066Sahrens dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 1829fa9e4066Sahrens ASSERT(db->db_level == 0); 1830fa9e4066Sahrens 1831fa9e4066Sahrens ASSERT((user_ptr == NULL) == (evict_func == NULL)); 1832fa9e4066Sahrens 1833fa9e4066Sahrens mutex_enter(&db->db_mtx); 1834fa9e4066Sahrens 1835c717a561Smaybee if (db->db_user_ptr == old_user_ptr) { 1836c717a561Smaybee db->db_user_ptr = user_ptr; 1837c717a561Smaybee db->db_user_data_ptr_ptr = user_data_ptr_ptr; 1838c717a561Smaybee db->db_evict_func = evict_func; 1839fa9e4066Sahrens 1840fa9e4066Sahrens dbuf_update_data(db); 1841fa9e4066Sahrens } else { 1842c717a561Smaybee old_user_ptr = db->db_user_ptr; 1843fa9e4066Sahrens } 1844fa9e4066Sahrens 1845fa9e4066Sahrens mutex_exit(&db->db_mtx); 1846fa9e4066Sahrens return (old_user_ptr); 1847fa9e4066Sahrens } 1848fa9e4066Sahrens 1849fa9e4066Sahrens void * 1850fa9e4066Sahrens dmu_buf_get_user(dmu_buf_t *db_fake) 1851fa9e4066Sahrens { 1852fa9e4066Sahrens dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 1853fa9e4066Sahrens ASSERT(!refcount_is_zero(&db->db_holds)); 1854fa9e4066Sahrens 1855c717a561Smaybee return (db->db_user_ptr); 1856fa9e4066Sahrens } 1857fa9e4066Sahrens 1858c717a561Smaybee static void 1859c717a561Smaybee dbuf_check_blkptr(dnode_t *dn, dmu_buf_impl_t *db) 1860fa9e4066Sahrens { 1861c717a561Smaybee /* ASSERT(dmu_tx_is_syncing(tx) */ 1862c717a561Smaybee ASSERT(MUTEX_HELD(&db->db_mtx)); 1863c717a561Smaybee 1864c717a561Smaybee if (db->db_blkptr != NULL) 1865c717a561Smaybee return; 1866c717a561Smaybee 1867c717a561Smaybee if (db->db_level == dn->dn_phys->dn_nlevels-1) { 1868c717a561Smaybee /* 1869c717a561Smaybee * This buffer was allocated at a time when there was 1870c717a561Smaybee * no available blkptrs from the dnode, or it was 1871c717a561Smaybee * inappropriate to hook it in (i.e., nlevels mis-match). 1872c717a561Smaybee */ 1873c717a561Smaybee ASSERT(db->db_blkid < dn->dn_phys->dn_nblkptr); 1874c717a561Smaybee ASSERT(db->db_parent == NULL); 1875c717a561Smaybee db->db_parent = dn->dn_dbuf; 1876c717a561Smaybee db->db_blkptr = &dn->dn_phys->dn_blkptr[db->db_blkid]; 1877c717a561Smaybee DBUF_VERIFY(db); 1878c717a561Smaybee } else { 1879c717a561Smaybee dmu_buf_impl_t *parent = db->db_parent; 1880c717a561Smaybee int epbs = dn->dn_phys->dn_indblkshift - SPA_BLKPTRSHIFT; 1881c717a561Smaybee 1882c717a561Smaybee ASSERT(dn->dn_phys->dn_nlevels > 1); 1883c717a561Smaybee if (parent == NULL) { 1884c717a561Smaybee mutex_exit(&db->db_mtx); 1885c717a561Smaybee rw_enter(&dn->dn_struct_rwlock, RW_READER); 1886c717a561Smaybee (void) dbuf_hold_impl(dn, db->db_level+1, 1887c717a561Smaybee db->db_blkid >> epbs, FALSE, db, &parent); 1888c717a561Smaybee rw_exit(&dn->dn_struct_rwlock); 1889c717a561Smaybee mutex_enter(&db->db_mtx); 1890c717a561Smaybee db->db_parent = parent; 1891c717a561Smaybee } 1892c717a561Smaybee db->db_blkptr = (blkptr_t *)parent->db.db_data + 1893c717a561Smaybee (db->db_blkid & ((1ULL << epbs) - 1)); 1894c717a561Smaybee DBUF_VERIFY(db); 1895c717a561Smaybee } 1896c717a561Smaybee } 1897c717a561Smaybee 1898c717a561Smaybee static void 1899c717a561Smaybee dbuf_sync_indirect(dbuf_dirty_record_t *dr, dmu_tx_t *tx) 1900c717a561Smaybee { 1901c717a561Smaybee dmu_buf_impl_t *db = dr->dr_dbuf; 1902c717a561Smaybee dnode_t *dn = db->db_dnode; 1903c717a561Smaybee zio_t *zio; 1904c717a561Smaybee 1905c717a561Smaybee ASSERT(dmu_tx_is_syncing(tx)); 1906c717a561Smaybee 1907c717a561Smaybee dprintf_dbuf_bp(db, db->db_blkptr, "blkptr=%p", db->db_blkptr); 1908c717a561Smaybee 1909c717a561Smaybee mutex_enter(&db->db_mtx); 1910c717a561Smaybee 1911c717a561Smaybee ASSERT(db->db_level > 0); 1912c717a561Smaybee DBUF_VERIFY(db); 1913c717a561Smaybee 1914c717a561Smaybee if (db->db_buf == NULL) { 1915c717a561Smaybee mutex_exit(&db->db_mtx); 1916c717a561Smaybee (void) dbuf_read(db, NULL, DB_RF_MUST_SUCCEED); 1917c717a561Smaybee mutex_enter(&db->db_mtx); 1918c717a561Smaybee } 1919c717a561Smaybee ASSERT3U(db->db_state, ==, DB_CACHED); 1920c717a561Smaybee ASSERT3U(db->db.db_size, ==, 1<<dn->dn_phys->dn_indblkshift); 1921c717a561Smaybee ASSERT(db->db_buf != NULL); 1922c717a561Smaybee 1923c717a561Smaybee dbuf_check_blkptr(dn, db); 1924c717a561Smaybee 1925c717a561Smaybee db->db_data_pending = dr; 1926c717a561Smaybee 1927af2c4821Smaybee mutex_exit(&db->db_mtx); 1928088f3894Sahrens dbuf_write(dr, db->db_buf, tx); 1929c717a561Smaybee 1930c717a561Smaybee zio = dr->dr_zio; 1931c717a561Smaybee mutex_enter(&dr->dt.di.dr_mtx); 1932c717a561Smaybee dbuf_sync_list(&dr->dt.di.dr_children, tx); 1933c717a561Smaybee ASSERT(list_head(&dr->dt.di.dr_children) == NULL); 1934c717a561Smaybee mutex_exit(&dr->dt.di.dr_mtx); 1935c717a561Smaybee zio_nowait(zio); 1936c717a561Smaybee } 1937c717a561Smaybee 1938c717a561Smaybee static void 1939c717a561Smaybee dbuf_sync_leaf(dbuf_dirty_record_t *dr, dmu_tx_t *tx) 1940c717a561Smaybee { 1941c717a561Smaybee arc_buf_t **datap = &dr->dt.dl.dr_data; 1942c717a561Smaybee dmu_buf_impl_t *db = dr->dr_dbuf; 1943fa9e4066Sahrens dnode_t *dn = db->db_dnode; 1944fa9e4066Sahrens objset_impl_t *os = dn->dn_objset; 1945c717a561Smaybee uint64_t txg = tx->tx_txg; 1946fa9e4066Sahrens 1947fa9e4066Sahrens ASSERT(dmu_tx_is_syncing(tx)); 1948fa9e4066Sahrens 1949fa9e4066Sahrens dprintf_dbuf_bp(db, db->db_blkptr, "blkptr=%p", db->db_blkptr); 1950fa9e4066Sahrens 1951fa9e4066Sahrens mutex_enter(&db->db_mtx); 1952fa9e4066Sahrens /* 1953fa9e4066Sahrens * To be synced, we must be dirtied. But we 1954fa9e4066Sahrens * might have been freed after the dirty. 1955fa9e4066Sahrens */ 1956fa9e4066Sahrens if (db->db_state == DB_UNCACHED) { 1957fa9e4066Sahrens /* This buffer has been freed since it was dirtied */ 1958fa9e4066Sahrens ASSERT(db->db.db_data == NULL); 1959fa9e4066Sahrens } else if (db->db_state == DB_FILL) { 1960fa9e4066Sahrens /* This buffer was freed and is now being re-filled */ 1961c717a561Smaybee ASSERT(db->db.db_data != dr->dt.dl.dr_data); 1962fa9e4066Sahrens } else { 196382c9918fSTim Haley ASSERT(db->db_state == DB_CACHED || db->db_state == DB_NOFILL); 1964fa9e4066Sahrens } 19659c9dc39aSek110237 DBUF_VERIFY(db); 1966fa9e4066Sahrens 1967fa9e4066Sahrens /* 1968c717a561Smaybee * If this is a bonus buffer, simply copy the bonus data into the 1969c717a561Smaybee * dnode. It will be written out when the dnode is synced (and it 1970c717a561Smaybee * will be synced, since it must have been dirty for dbuf_sync to 1971c717a561Smaybee * be called). 1972fa9e4066Sahrens */ 1973ea8dc4b6Seschrock if (db->db_blkid == DB_BONUS_BLKID) { 1974c717a561Smaybee dbuf_dirty_record_t **drp; 19751934e92fSmaybee 1976ea8dc4b6Seschrock ASSERT(*datap != NULL); 1977ea8dc4b6Seschrock ASSERT3U(db->db_level, ==, 0); 1978ea8dc4b6Seschrock ASSERT3U(dn->dn_phys->dn_bonuslen, <=, DN_MAX_BONUSLEN); 1979ea8dc4b6Seschrock bcopy(*datap, DN_BONUS(dn->dn_phys), dn->dn_phys->dn_bonuslen); 19800e8c6158Smaybee if (*datap != db->db.db_data) { 1981ea8dc4b6Seschrock zio_buf_free(*datap, DN_MAX_BONUSLEN); 19825a98e54bSBrendan Gregg - Sun Microsystems arc_space_return(DN_MAX_BONUSLEN, ARC_SPACE_OTHER); 19830e8c6158Smaybee } 1984ea8dc4b6Seschrock db->db_data_pending = NULL; 1985c717a561Smaybee drp = &db->db_last_dirty; 1986c717a561Smaybee while (*drp != dr) 1987c717a561Smaybee drp = &(*drp)->dr_next; 198817f17c2dSbonwick ASSERT(dr->dr_next == NULL); 198917f17c2dSbonwick *drp = dr->dr_next; 1990c717a561Smaybee kmem_free(dr, sizeof (dbuf_dirty_record_t)); 1991ea8dc4b6Seschrock ASSERT(db->db_dirtycnt > 0); 1992ea8dc4b6Seschrock db->db_dirtycnt -= 1; 1993ea8dc4b6Seschrock mutex_exit(&db->db_mtx); 1994ea8dc4b6Seschrock dbuf_rele(db, (void *)(uintptr_t)txg); 1995ea8dc4b6Seschrock return; 1996ea8dc4b6Seschrock } 1997ea8dc4b6Seschrock 1998c5c6ffa0Smaybee /* 1999f82bfe17Sgw25295 * This function may have dropped the db_mtx lock allowing a dmu_sync 2000f82bfe17Sgw25295 * operation to sneak in. As a result, we need to ensure that we 2001f82bfe17Sgw25295 * don't check the dr_override_state until we have returned from 2002f82bfe17Sgw25295 * dbuf_check_blkptr. 2003f82bfe17Sgw25295 */ 2004f82bfe17Sgw25295 dbuf_check_blkptr(dn, db); 2005f82bfe17Sgw25295 2006f82bfe17Sgw25295 /* 2007c717a561Smaybee * If this buffer is in the middle of an immdiate write, 2008c717a561Smaybee * wait for the synchronous IO to complete. 2009c5c6ffa0Smaybee */ 2010c717a561Smaybee while (dr->dt.dl.dr_override_state == DR_IN_DMU_SYNC) { 2011c5c6ffa0Smaybee ASSERT(dn->dn_object != DMU_META_DNODE_OBJECT); 2012c5c6ffa0Smaybee cv_wait(&db->db_changed, &db->db_mtx); 2013c717a561Smaybee ASSERT(dr->dt.dl.dr_override_state != DR_NOT_OVERRIDDEN); 2014c5c6ffa0Smaybee } 2015c717a561Smaybee 2016c717a561Smaybee /* 2017c717a561Smaybee * If this dbuf has already been written out via an immediate write, 2018c717a561Smaybee * just complete the write by copying over the new block pointer and 2019c717a561Smaybee * updating the accounting via the write-completion functions. 2020c717a561Smaybee */ 2021c717a561Smaybee if (dr->dt.dl.dr_override_state == DR_OVERRIDDEN) { 2022c717a561Smaybee zio_t zio_fake; 2023c717a561Smaybee 2024c717a561Smaybee zio_fake.io_private = &db; 2025c717a561Smaybee zio_fake.io_error = 0; 2026c717a561Smaybee zio_fake.io_bp = db->db_blkptr; 2027c717a561Smaybee zio_fake.io_bp_orig = *db->db_blkptr; 2028c717a561Smaybee zio_fake.io_txg = txg; 2029e14bb325SJeff Bonwick zio_fake.io_flags = 0; 2030c717a561Smaybee 2031c717a561Smaybee *db->db_blkptr = dr->dt.dl.dr_overridden_by; 2032c717a561Smaybee dr->dt.dl.dr_override_state = DR_NOT_OVERRIDDEN; 2033c717a561Smaybee db->db_data_pending = dr; 2034c717a561Smaybee dr->dr_zio = &zio_fake; 2035c717a561Smaybee mutex_exit(&db->db_mtx); 2036c717a561Smaybee 2037e14bb325SJeff Bonwick ASSERT(!DVA_EQUAL(BP_IDENTITY(zio_fake.io_bp), 2038f4a72450SJeff Bonwick BP_IDENTITY(&zio_fake.io_bp_orig)) || 2039f4a72450SJeff Bonwick BP_IS_HOLE(zio_fake.io_bp)); 2040e14bb325SJeff Bonwick 2041c717a561Smaybee if (BP_IS_OLDER(&zio_fake.io_bp_orig, txg)) 2042cdb0ab79Smaybee (void) dsl_dataset_block_kill(os->os_dsl_dataset, 2043c717a561Smaybee &zio_fake.io_bp_orig, dn->dn_zio, tx); 2044c717a561Smaybee 2045c717a561Smaybee dbuf_write_ready(&zio_fake, db->db_buf, db); 2046c717a561Smaybee dbuf_write_done(&zio_fake, db->db_buf, db); 2047c717a561Smaybee 2048c717a561Smaybee return; 2049c717a561Smaybee } 2050c717a561Smaybee 2051*ab69d62fSMatthew Ahrens if (db->db_state != DB_NOFILL && 2052*ab69d62fSMatthew Ahrens dn->dn_object != DMU_META_DNODE_OBJECT && 2053*ab69d62fSMatthew Ahrens refcount_count(&db->db_holds) > 1 && 2054*ab69d62fSMatthew Ahrens *datap == db->db_buf) { 2055fa9e4066Sahrens /* 205682c9918fSTim Haley * If this buffer is currently "in use" (i.e., there 205782c9918fSTim Haley * are active holds and db_data still references it), 205882c9918fSTim Haley * then make a copy before we start the write so that 205982c9918fSTim Haley * any modifications from the open txg will not leak 206082c9918fSTim Haley * into this write. 2061fa9e4066Sahrens * 206282c9918fSTim Haley * NOTE: this copy does not need to be made for 206382c9918fSTim Haley * objects only modified in the syncing context (e.g. 206482c9918fSTim Haley * DNONE_DNODE blocks). 2065fa9e4066Sahrens */ 2066*ab69d62fSMatthew Ahrens int blksz = arc_buf_size(*datap); 2067*ab69d62fSMatthew Ahrens arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db); 2068*ab69d62fSMatthew Ahrens *datap = arc_buf_alloc(os->os_spa, blksz, db, type); 2069c717a561Smaybee bcopy(db->db.db_data, (*datap)->b_data, blksz); 2070fa9e4066Sahrens } 2071c717a561Smaybee db->db_data_pending = dr; 2072fa9e4066Sahrens 2073fa9e4066Sahrens mutex_exit(&db->db_mtx); 2074fa9e4066Sahrens 2075088f3894Sahrens dbuf_write(dr, *datap, tx); 2076c717a561Smaybee 2077c717a561Smaybee ASSERT(!list_link_active(&dr->dr_dirty_node)); 2078c717a561Smaybee if (dn->dn_object == DMU_META_DNODE_OBJECT) 2079c717a561Smaybee list_insert_tail(&dn->dn_dirty_records[txg&TXG_MASK], dr); 2080c717a561Smaybee else 2081c717a561Smaybee zio_nowait(dr->dr_zio); 2082fa9e4066Sahrens } 2083c717a561Smaybee 2084c717a561Smaybee void 2085c717a561Smaybee dbuf_sync_list(list_t *list, dmu_tx_t *tx) 2086c717a561Smaybee { 2087c717a561Smaybee dbuf_dirty_record_t *dr; 2088c717a561Smaybee 2089c717a561Smaybee while (dr = list_head(list)) { 2090c717a561Smaybee if (dr->dr_zio != NULL) { 2091c717a561Smaybee /* 2092c717a561Smaybee * If we find an already initialized zio then we 2093c717a561Smaybee * are processing the meta-dnode, and we have finished. 2094c717a561Smaybee * The dbufs for all dnodes are put back on the list 2095c717a561Smaybee * during processing, so that we can zio_wait() 2096c717a561Smaybee * these IOs after initiating all child IOs. 2097c717a561Smaybee */ 2098c717a561Smaybee ASSERT3U(dr->dr_dbuf->db.db_object, ==, 2099c717a561Smaybee DMU_META_DNODE_OBJECT); 2100c717a561Smaybee break; 2101fa9e4066Sahrens } 2102c717a561Smaybee list_remove(list, dr); 2103c717a561Smaybee if (dr->dr_dbuf->db_level > 0) 2104c717a561Smaybee dbuf_sync_indirect(dr, tx); 2105c717a561Smaybee else 2106c717a561Smaybee dbuf_sync_leaf(dr, tx); 2107c717a561Smaybee } 2108c717a561Smaybee } 2109c717a561Smaybee 2110c717a561Smaybee static void 2111088f3894Sahrens dbuf_write(dbuf_dirty_record_t *dr, arc_buf_t *data, dmu_tx_t *tx) 2112c717a561Smaybee { 2113c717a561Smaybee dmu_buf_impl_t *db = dr->dr_dbuf; 2114c717a561Smaybee dnode_t *dn = db->db_dnode; 2115c717a561Smaybee objset_impl_t *os = dn->dn_objset; 2116c717a561Smaybee dmu_buf_impl_t *parent = db->db_parent; 2117c717a561Smaybee uint64_t txg = tx->tx_txg; 2118c717a561Smaybee zbookmark_t zb; 2119088f3894Sahrens writeprops_t wp = { 0 }; 2120c717a561Smaybee zio_t *zio; 2121c717a561Smaybee 2122088f3894Sahrens if (!BP_IS_HOLE(db->db_blkptr) && 2123088f3894Sahrens (db->db_level > 0 || dn->dn_type == DMU_OT_DNODE)) { 2124088f3894Sahrens /* 2125088f3894Sahrens * Private object buffers are released here rather 2126088f3894Sahrens * than in dbuf_dirty() since they are only modified 2127088f3894Sahrens * in the syncing context and we don't want the 2128088f3894Sahrens * overhead of making multiple copies of the data. 2129088f3894Sahrens */ 2130088f3894Sahrens arc_release(data, db); 213182c9918fSTim Haley } else if (db->db_state != DB_NOFILL) { 2132088f3894Sahrens ASSERT(arc_released(data)); 2133088f3894Sahrens /* XXX why do we need to thaw here? */ 2134088f3894Sahrens arc_buf_thaw(data); 2135088f3894Sahrens } 2136088f3894Sahrens 2137c717a561Smaybee if (parent != dn->dn_dbuf) { 2138c717a561Smaybee ASSERT(parent && parent->db_data_pending); 2139c717a561Smaybee ASSERT(db->db_level == parent->db_level-1); 2140c717a561Smaybee ASSERT(arc_released(parent->db_buf)); 2141c717a561Smaybee zio = parent->db_data_pending->dr_zio; 2142c717a561Smaybee } else { 2143c717a561Smaybee ASSERT(db->db_level == dn->dn_phys->dn_nlevels-1); 2144c717a561Smaybee ASSERT3P(db->db_blkptr, ==, 2145c717a561Smaybee &dn->dn_phys->dn_blkptr[db->db_blkid]); 2146c717a561Smaybee zio = dn->dn_zio; 2147c717a561Smaybee } 2148c717a561Smaybee 2149c717a561Smaybee ASSERT(db->db_level == 0 || data == db->db_buf); 2150c717a561Smaybee ASSERT3U(db->db_blkptr->blk_birth, <=, txg); 2151c717a561Smaybee ASSERT(zio); 2152c717a561Smaybee 2153ea8dc4b6Seschrock zb.zb_objset = os->os_dsl_dataset ? os->os_dsl_dataset->ds_object : 0; 2154ea8dc4b6Seschrock zb.zb_object = db->db.db_object; 2155ea8dc4b6Seschrock zb.zb_level = db->db_level; 2156ea8dc4b6Seschrock zb.zb_blkid = db->db_blkid; 215744cd46caSbillm 2158088f3894Sahrens wp.wp_type = dn->dn_type; 2159088f3894Sahrens wp.wp_level = db->db_level; 2160088f3894Sahrens wp.wp_copies = os->os_copies; 2161088f3894Sahrens wp.wp_dncompress = dn->dn_compress; 2162088f3894Sahrens wp.wp_oscompress = os->os_compress; 2163088f3894Sahrens wp.wp_dnchecksum = dn->dn_checksum; 2164088f3894Sahrens wp.wp_oschecksum = os->os_checksum; 2165088f3894Sahrens 2166c717a561Smaybee if (BP_IS_OLDER(db->db_blkptr, txg)) 2167cdb0ab79Smaybee (void) dsl_dataset_block_kill( 2168c717a561Smaybee os->os_dsl_dataset, db->db_blkptr, zio, tx); 2169c717a561Smaybee 217082c9918fSTim Haley if (db->db_state == DB_NOFILL) { 217182c9918fSTim Haley zio_prop_t zp = { 0 }; 217282c9918fSTim Haley 217382c9918fSTim Haley write_policy(os->os_spa, &wp, &zp); 217482c9918fSTim Haley dr->dr_zio = zio_write(zio, os->os_spa, 217582c9918fSTim Haley txg, db->db_blkptr, NULL, 217682c9918fSTim Haley db->db.db_size, &zp, dbuf_skip_write_ready, 217782c9918fSTim Haley dbuf_skip_write_done, db, ZIO_PRIORITY_ASYNC_WRITE, 217882c9918fSTim Haley ZIO_FLAG_MUSTSUCCEED, &zb); 217982c9918fSTim Haley } else { 2180088f3894Sahrens dr->dr_zio = arc_write(zio, os->os_spa, &wp, 21813baa08fcSek110237 DBUF_IS_L2CACHEABLE(db), txg, db->db_blkptr, 21823baa08fcSek110237 data, dbuf_write_ready, dbuf_write_done, db, 2183e14bb325SJeff Bonwick ZIO_PRIORITY_ASYNC_WRITE, ZIO_FLAG_MUSTSUCCEED, &zb); 2184fa9e4066Sahrens } 218582c9918fSTim Haley } 218682c9918fSTim Haley 218782c9918fSTim Haley /* wrapper function for dbuf_write_ready bypassing ARC */ 218882c9918fSTim Haley static void 218982c9918fSTim Haley dbuf_skip_write_ready(zio_t *zio) 219082c9918fSTim Haley { 219182c9918fSTim Haley blkptr_t *bp = zio->io_bp; 219282c9918fSTim Haley 219382c9918fSTim Haley if (!BP_IS_GANG(bp)) 219482c9918fSTim Haley zio_skip_write(zio); 219582c9918fSTim Haley 219682c9918fSTim Haley dbuf_write_ready(zio, NULL, zio->io_private); 219782c9918fSTim Haley } 219882c9918fSTim Haley 219982c9918fSTim Haley /* wrapper function for dbuf_write_done bypassing ARC */ 220082c9918fSTim Haley static void 220182c9918fSTim Haley dbuf_skip_write_done(zio_t *zio) 220282c9918fSTim Haley { 220382c9918fSTim Haley dbuf_write_done(zio, NULL, zio->io_private); 220482c9918fSTim Haley } 2205fa9e4066Sahrens 2206fa9e4066Sahrens /* ARGSUSED */ 2207fa9e4066Sahrens static void 2208c717a561Smaybee dbuf_write_ready(zio_t *zio, arc_buf_t *buf, void *vdb) 2209fa9e4066Sahrens { 2210fa9e4066Sahrens dmu_buf_impl_t *db = vdb; 2211fa9e4066Sahrens dnode_t *dn = db->db_dnode; 2212fa9e4066Sahrens objset_impl_t *os = dn->dn_objset; 2213e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp; 2214c717a561Smaybee blkptr_t *bp_orig = &zio->io_bp_orig; 2215fa9e4066Sahrens uint64_t fill = 0; 2216c717a561Smaybee int old_size, new_size, i; 2217fa9e4066Sahrens 2218e14bb325SJeff Bonwick ASSERT(db->db_blkptr == bp); 2219e14bb325SJeff Bonwick 2220c717a561Smaybee dprintf_dbuf_bp(db, bp_orig, "bp_orig: %s", ""); 2221fa9e4066Sahrens 2222c717a561Smaybee old_size = bp_get_dasize(os->os_spa, bp_orig); 2223e14bb325SJeff Bonwick new_size = bp_get_dasize(os->os_spa, bp); 2224fa9e4066Sahrens 2225fa9e4066Sahrens dnode_diduse_space(dn, new_size - old_size); 2226fa9e4066Sahrens 2227e14bb325SJeff Bonwick if (BP_IS_HOLE(bp)) { 2228c717a561Smaybee dsl_dataset_t *ds = os->os_dsl_dataset; 2229c717a561Smaybee dmu_tx_t *tx = os->os_synctx; 2230c717a561Smaybee 2231c717a561Smaybee if (bp_orig->blk_birth == tx->tx_txg) 2232e14bb325SJeff Bonwick (void) dsl_dataset_block_kill(ds, bp_orig, zio, tx); 2233e14bb325SJeff Bonwick ASSERT3U(bp->blk_fill, ==, 0); 2234c717a561Smaybee return; 2235c717a561Smaybee } 2236c717a561Smaybee 2237e14bb325SJeff Bonwick ASSERT(BP_GET_TYPE(bp) == dn->dn_type); 2238e14bb325SJeff Bonwick ASSERT(BP_GET_LEVEL(bp) == db->db_level); 2239e14bb325SJeff Bonwick 2240fa9e4066Sahrens mutex_enter(&db->db_mtx); 2241fa9e4066Sahrens 2242fa9e4066Sahrens if (db->db_level == 0) { 2243fa9e4066Sahrens mutex_enter(&dn->dn_mtx); 2244c717a561Smaybee if (db->db_blkid > dn->dn_phys->dn_maxblkid) 2245fa9e4066Sahrens dn->dn_phys->dn_maxblkid = db->db_blkid; 2246fa9e4066Sahrens mutex_exit(&dn->dn_mtx); 2247fa9e4066Sahrens 2248fa9e4066Sahrens if (dn->dn_type == DMU_OT_DNODE) { 2249fa9e4066Sahrens dnode_phys_t *dnp = db->db.db_data; 2250fa9e4066Sahrens for (i = db->db.db_size >> DNODE_SHIFT; i > 0; 2251fa9e4066Sahrens i--, dnp++) { 2252fa9e4066Sahrens if (dnp->dn_type != DMU_OT_NONE) 2253fa9e4066Sahrens fill++; 2254fa9e4066Sahrens } 2255fa9e4066Sahrens } else { 2256fa9e4066Sahrens fill = 1; 2257fa9e4066Sahrens } 2258fa9e4066Sahrens } else { 2259e14bb325SJeff Bonwick blkptr_t *ibp = db->db.db_data; 2260fa9e4066Sahrens ASSERT3U(db->db.db_size, ==, 1<<dn->dn_phys->dn_indblkshift); 2261e14bb325SJeff Bonwick for (i = db->db.db_size >> SPA_BLKPTRSHIFT; i > 0; i--, ibp++) { 2262e14bb325SJeff Bonwick if (BP_IS_HOLE(ibp)) 2263fa9e4066Sahrens continue; 2264e14bb325SJeff Bonwick ASSERT3U(BP_GET_LSIZE(ibp), ==, 2265fa9e4066Sahrens db->db_level == 1 ? dn->dn_datablksz : 2266fa9e4066Sahrens (1<<dn->dn_phys->dn_indblkshift)); 2267e14bb325SJeff Bonwick fill += ibp->blk_fill; 2268fa9e4066Sahrens } 2269fa9e4066Sahrens } 2270fa9e4066Sahrens 2271e14bb325SJeff Bonwick bp->blk_fill = fill; 2272fa9e4066Sahrens 2273fa9e4066Sahrens mutex_exit(&db->db_mtx); 2274fa9e4066Sahrens 2275e14bb325SJeff Bonwick if (zio->io_flags & ZIO_FLAG_IO_REWRITE) { 2276e14bb325SJeff Bonwick ASSERT(DVA_EQUAL(BP_IDENTITY(bp), BP_IDENTITY(bp_orig))); 2277e14bb325SJeff Bonwick } else { 2278c717a561Smaybee dsl_dataset_t *ds = os->os_dsl_dataset; 2279c717a561Smaybee dmu_tx_t *tx = os->os_synctx; 2280c717a561Smaybee 2281c717a561Smaybee if (bp_orig->blk_birth == tx->tx_txg) 2282e14bb325SJeff Bonwick (void) dsl_dataset_block_kill(ds, bp_orig, zio, tx); 2283e14bb325SJeff Bonwick dsl_dataset_block_born(ds, bp, tx); 2284fa9e4066Sahrens } 2285fa9e4066Sahrens } 2286fa9e4066Sahrens 2287c717a561Smaybee /* ARGSUSED */ 2288c717a561Smaybee static void 2289c717a561Smaybee dbuf_write_done(zio_t *zio, arc_buf_t *buf, void *vdb) 2290c717a561Smaybee { 2291c717a561Smaybee dmu_buf_impl_t *db = vdb; 2292c717a561Smaybee uint64_t txg = zio->io_txg; 2293c717a561Smaybee dbuf_dirty_record_t **drp, *dr; 2294c717a561Smaybee 2295c717a561Smaybee ASSERT3U(zio->io_error, ==, 0); 2296c717a561Smaybee 2297c717a561Smaybee mutex_enter(&db->db_mtx); 2298c717a561Smaybee 2299c717a561Smaybee drp = &db->db_last_dirty; 230017f17c2dSbonwick while ((dr = *drp) != db->db_data_pending) 230117f17c2dSbonwick drp = &dr->dr_next; 230217f17c2dSbonwick ASSERT(!list_link_active(&dr->dr_dirty_node)); 230317f17c2dSbonwick ASSERT(dr->dr_txg == txg); 230417f17c2dSbonwick ASSERT(dr->dr_next == NULL); 230517f17c2dSbonwick *drp = dr->dr_next; 2306c717a561Smaybee 2307c717a561Smaybee if (db->db_level == 0) { 2308c717a561Smaybee ASSERT(db->db_blkid != DB_BONUS_BLKID); 2309c717a561Smaybee ASSERT(dr->dt.dl.dr_override_state == DR_NOT_OVERRIDDEN); 2310c717a561Smaybee 231182c9918fSTim Haley if (db->db_state != DB_NOFILL) { 2312c717a561Smaybee if (dr->dt.dl.dr_data != db->db_buf) 231382c9918fSTim Haley VERIFY(arc_buf_remove_ref(dr->dt.dl.dr_data, 231482c9918fSTim Haley db) == 1); 2315c717a561Smaybee else if (!BP_IS_HOLE(db->db_blkptr)) 2316c717a561Smaybee arc_set_callback(db->db_buf, dbuf_do_evict, db); 2317c717a561Smaybee else 2318c717a561Smaybee ASSERT(arc_released(db->db_buf)); 231982c9918fSTim Haley } 2320c717a561Smaybee } else { 2321c717a561Smaybee dnode_t *dn = db->db_dnode; 2322c717a561Smaybee 2323c717a561Smaybee ASSERT(list_head(&dr->dt.di.dr_children) == NULL); 2324c717a561Smaybee ASSERT3U(db->db.db_size, ==, 1<<dn->dn_phys->dn_indblkshift); 2325c717a561Smaybee if (!BP_IS_HOLE(db->db_blkptr)) { 2326c717a561Smaybee int epbs = 2327c717a561Smaybee dn->dn_phys->dn_indblkshift - SPA_BLKPTRSHIFT; 2328c717a561Smaybee ASSERT3U(BP_GET_LSIZE(db->db_blkptr), ==, 2329c717a561Smaybee db->db.db_size); 2330c717a561Smaybee ASSERT3U(dn->dn_phys->dn_maxblkid 2331c717a561Smaybee >> (db->db_level * epbs), >=, db->db_blkid); 2332c717a561Smaybee arc_set_callback(db->db_buf, dbuf_do_evict, db); 2333c717a561Smaybee } 2334c25056deSgw25295 mutex_destroy(&dr->dt.di.dr_mtx); 2335c25056deSgw25295 list_destroy(&dr->dt.di.dr_children); 2336c717a561Smaybee } 2337c717a561Smaybee kmem_free(dr, sizeof (dbuf_dirty_record_t)); 2338c717a561Smaybee 2339c717a561Smaybee cv_broadcast(&db->db_changed); 2340c717a561Smaybee ASSERT(db->db_dirtycnt > 0); 2341c717a561Smaybee db->db_dirtycnt -= 1; 2342c717a561Smaybee db->db_data_pending = NULL; 2343c717a561Smaybee mutex_exit(&db->db_mtx); 2344c717a561Smaybee 2345c717a561Smaybee dprintf_dbuf_bp(db, zio->io_bp, "bp: %s", ""); 2346c717a561Smaybee 2347ea8dc4b6Seschrock dbuf_rele(db, (void *)(uintptr_t)txg); 2348fa9e4066Sahrens } 2349