dmu.c revision 226620
1168404Spjd/* 2168404Spjd * CDDL HEADER START 3168404Spjd * 4168404Spjd * The contents of this file are subject to the terms of the 5168404Spjd * Common Development and Distribution License (the "License"). 6168404Spjd * You may not use this file except in compliance with the License. 7168404Spjd * 8168404Spjd * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9168404Spjd * or http://www.opensolaris.org/os/licensing. 10168404Spjd * See the License for the specific language governing permissions 11168404Spjd * and limitations under the License. 12168404Spjd * 13168404Spjd * When distributing Covered Code, include this CDDL HEADER in each 14168404Spjd * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15168404Spjd * If applicable, add the following below this CDDL HEADER, with the 16168404Spjd * fields enclosed by brackets "[]" replaced with your own identifying 17168404Spjd * information: Portions Copyright [yyyy] [name of copyright owner] 18168404Spjd * 19168404Spjd * CDDL HEADER END 20168404Spjd */ 21168404Spjd/* 22219089Spjd * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 23168404Spjd */ 24168404Spjd 25168404Spjd#include <sys/dmu.h> 26168404Spjd#include <sys/dmu_impl.h> 27168404Spjd#include <sys/dmu_tx.h> 28168404Spjd#include <sys/dbuf.h> 29168404Spjd#include <sys/dnode.h> 30168404Spjd#include <sys/zfs_context.h> 31168404Spjd#include <sys/dmu_objset.h> 32168404Spjd#include <sys/dmu_traverse.h> 33168404Spjd#include <sys/dsl_dataset.h> 34168404Spjd#include <sys/dsl_dir.h> 35168404Spjd#include <sys/dsl_pool.h> 36168404Spjd#include <sys/dsl_synctask.h> 37168404Spjd#include <sys/dsl_prop.h> 38168404Spjd#include <sys/dmu_zfetch.h> 39168404Spjd#include <sys/zfs_ioctl.h> 40168404Spjd#include <sys/zap.h> 41168404Spjd#include <sys/zio_checksum.h> 42219089Spjd#include <sys/sa.h> 43219089Spjd#ifdef _KERNEL 44185029Spjd#include <sys/zfs_znode.h> 45219089Spjd#endif 46168404Spjd 47168404Spjdconst dmu_object_type_info_t dmu_ot[DMU_OT_NUMTYPES] = { 48168404Spjd { byteswap_uint8_array, TRUE, "unallocated" }, 49168404Spjd { zap_byteswap, TRUE, "object directory" }, 50168404Spjd { byteswap_uint64_array, TRUE, "object array" }, 51168404Spjd { byteswap_uint8_array, TRUE, "packed nvlist" }, 52168404Spjd { byteswap_uint64_array, TRUE, "packed nvlist size" }, 53219089Spjd { byteswap_uint64_array, TRUE, "bpobj" }, 54219089Spjd { byteswap_uint64_array, TRUE, "bpobj header" }, 55168404Spjd { byteswap_uint64_array, TRUE, "SPA space map header" }, 56168404Spjd { byteswap_uint64_array, TRUE, "SPA space map" }, 57168404Spjd { byteswap_uint64_array, TRUE, "ZIL intent log" }, 58168404Spjd { dnode_buf_byteswap, TRUE, "DMU dnode" }, 59168404Spjd { dmu_objset_byteswap, TRUE, "DMU objset" }, 60168404Spjd { byteswap_uint64_array, TRUE, "DSL directory" }, 61168404Spjd { zap_byteswap, TRUE, "DSL directory child map"}, 62168404Spjd { zap_byteswap, TRUE, "DSL dataset snap map" }, 63168404Spjd { zap_byteswap, TRUE, "DSL props" }, 64168404Spjd { byteswap_uint64_array, TRUE, "DSL dataset" }, 65168404Spjd { zfs_znode_byteswap, TRUE, "ZFS znode" }, 66185029Spjd { zfs_oldacl_byteswap, TRUE, "ZFS V0 ACL" }, 67168404Spjd { byteswap_uint8_array, FALSE, "ZFS plain file" }, 68168404Spjd { zap_byteswap, TRUE, "ZFS directory" }, 69168404Spjd { zap_byteswap, TRUE, "ZFS master node" }, 70168404Spjd { zap_byteswap, TRUE, "ZFS delete queue" }, 71168404Spjd { byteswap_uint8_array, FALSE, "zvol object" }, 72168404Spjd { zap_byteswap, TRUE, "zvol prop" }, 73168404Spjd { byteswap_uint8_array, FALSE, "other uint8[]" }, 74168404Spjd { byteswap_uint64_array, FALSE, "other uint64[]" }, 75168404Spjd { zap_byteswap, TRUE, "other ZAP" }, 76168404Spjd { zap_byteswap, TRUE, "persistent error log" }, 77168404Spjd { byteswap_uint8_array, TRUE, "SPA history" }, 78168404Spjd { byteswap_uint64_array, TRUE, "SPA history offsets" }, 79185029Spjd { zap_byteswap, TRUE, "Pool properties" }, 80185029Spjd { zap_byteswap, TRUE, "DSL permissions" }, 81185029Spjd { zfs_acl_byteswap, TRUE, "ZFS ACL" }, 82185029Spjd { byteswap_uint8_array, TRUE, "ZFS SYSACL" }, 83185029Spjd { byteswap_uint8_array, TRUE, "FUID table" }, 84185029Spjd { byteswap_uint64_array, TRUE, "FUID table size" }, 85185029Spjd { zap_byteswap, TRUE, "DSL dataset next clones"}, 86219089Spjd { zap_byteswap, TRUE, "scan work queue" }, 87209962Smm { zap_byteswap, TRUE, "ZFS user/group used" }, 88209962Smm { zap_byteswap, TRUE, "ZFS user/group quota" }, 89219089Spjd { zap_byteswap, TRUE, "snapshot refcount tags"}, 90219089Spjd { zap_byteswap, TRUE, "DDT ZAP algorithm" }, 91219089Spjd { zap_byteswap, TRUE, "DDT statistics" }, 92219089Spjd { byteswap_uint8_array, TRUE, "System attributes" }, 93219089Spjd { zap_byteswap, TRUE, "SA master node" }, 94219089Spjd { zap_byteswap, TRUE, "SA attr registration" }, 95219089Spjd { zap_byteswap, TRUE, "SA attr layouts" }, 96219089Spjd { zap_byteswap, TRUE, "scan translations" }, 97219089Spjd { byteswap_uint8_array, FALSE, "deduplicated block" }, 98219089Spjd { zap_byteswap, TRUE, "DSL deadlist map" }, 99219089Spjd { byteswap_uint64_array, TRUE, "DSL deadlist map hdr" }, 100219089Spjd { zap_byteswap, TRUE, "DSL dir clones" }, 101219089Spjd { byteswap_uint64_array, TRUE, "bpobj subobj" }, 102168404Spjd}; 103168404Spjd 104168404Spjdint 105168404Spjddmu_buf_hold(objset_t *os, uint64_t object, uint64_t offset, 106219089Spjd void *tag, dmu_buf_t **dbp, int flags) 107168404Spjd{ 108168404Spjd dnode_t *dn; 109168404Spjd uint64_t blkid; 110168404Spjd dmu_buf_impl_t *db; 111168404Spjd int err; 112219089Spjd int db_flags = DB_RF_CANFAIL; 113168404Spjd 114219089Spjd if (flags & DMU_READ_NO_PREFETCH) 115219089Spjd db_flags |= DB_RF_NOPREFETCH; 116219089Spjd 117219089Spjd err = dnode_hold(os, object, FTAG, &dn); 118168404Spjd if (err) 119168404Spjd return (err); 120168404Spjd blkid = dbuf_whichblock(dn, offset); 121168404Spjd rw_enter(&dn->dn_struct_rwlock, RW_READER); 122168404Spjd db = dbuf_hold(dn, blkid, tag); 123168404Spjd rw_exit(&dn->dn_struct_rwlock); 124168404Spjd if (db == NULL) { 125168404Spjd err = EIO; 126168404Spjd } else { 127219089Spjd err = dbuf_read(db, NULL, db_flags); 128168404Spjd if (err) { 129168404Spjd dbuf_rele(db, tag); 130168404Spjd db = NULL; 131168404Spjd } 132168404Spjd } 133168404Spjd 134168404Spjd dnode_rele(dn, FTAG); 135219089Spjd *dbp = &db->db; /* NULL db plus first field offset is NULL */ 136168404Spjd return (err); 137168404Spjd} 138168404Spjd 139168404Spjdint 140168404Spjddmu_bonus_max(void) 141168404Spjd{ 142168404Spjd return (DN_MAX_BONUSLEN); 143168404Spjd} 144168404Spjd 145185029Spjdint 146219089Spjddmu_set_bonus(dmu_buf_t *db_fake, int newsize, dmu_tx_t *tx) 147185029Spjd{ 148219089Spjd dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 149219089Spjd dnode_t *dn; 150219089Spjd int error; 151185029Spjd 152219089Spjd DB_DNODE_ENTER(db); 153219089Spjd dn = DB_DNODE(db); 154219089Spjd 155219089Spjd if (dn->dn_bonus != db) { 156219089Spjd error = EINVAL; 157219089Spjd } else if (newsize < 0 || newsize > db_fake->db_size) { 158219089Spjd error = EINVAL; 159219089Spjd } else { 160219089Spjd dnode_setbonuslen(dn, newsize, tx); 161219089Spjd error = 0; 162219089Spjd } 163219089Spjd 164219089Spjd DB_DNODE_EXIT(db); 165219089Spjd return (error); 166185029Spjd} 167185029Spjd 168219089Spjdint 169219089Spjddmu_set_bonustype(dmu_buf_t *db_fake, dmu_object_type_t type, dmu_tx_t *tx) 170219089Spjd{ 171219089Spjd dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 172219089Spjd dnode_t *dn; 173219089Spjd int error; 174219089Spjd 175219089Spjd DB_DNODE_ENTER(db); 176219089Spjd dn = DB_DNODE(db); 177219089Spjd 178219089Spjd if (type > DMU_OT_NUMTYPES) { 179219089Spjd error = EINVAL; 180219089Spjd } else if (dn->dn_bonus != db) { 181219089Spjd error = EINVAL; 182219089Spjd } else { 183219089Spjd dnode_setbonus_type(dn, type, tx); 184219089Spjd error = 0; 185219089Spjd } 186219089Spjd 187219089Spjd DB_DNODE_EXIT(db); 188219089Spjd return (error); 189219089Spjd} 190219089Spjd 191219089Spjddmu_object_type_t 192219089Spjddmu_get_bonustype(dmu_buf_t *db_fake) 193219089Spjd{ 194219089Spjd dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 195219089Spjd dnode_t *dn; 196219089Spjd dmu_object_type_t type; 197219089Spjd 198219089Spjd DB_DNODE_ENTER(db); 199219089Spjd dn = DB_DNODE(db); 200219089Spjd type = dn->dn_bonustype; 201219089Spjd DB_DNODE_EXIT(db); 202219089Spjd 203219089Spjd return (type); 204219089Spjd} 205219089Spjd 206219089Spjdint 207219089Spjddmu_rm_spill(objset_t *os, uint64_t object, dmu_tx_t *tx) 208219089Spjd{ 209219089Spjd dnode_t *dn; 210219089Spjd int error; 211219089Spjd 212219089Spjd error = dnode_hold(os, object, FTAG, &dn); 213219089Spjd dbuf_rm_spill(dn, tx); 214219089Spjd rw_enter(&dn->dn_struct_rwlock, RW_WRITER); 215219089Spjd dnode_rm_spill(dn, tx); 216219089Spjd rw_exit(&dn->dn_struct_rwlock); 217219089Spjd dnode_rele(dn, FTAG); 218219089Spjd return (error); 219219089Spjd} 220219089Spjd 221168404Spjd/* 222168404Spjd * returns ENOENT, EIO, or 0. 223168404Spjd */ 224168404Spjdint 225168404Spjddmu_bonus_hold(objset_t *os, uint64_t object, void *tag, dmu_buf_t **dbp) 226168404Spjd{ 227168404Spjd dnode_t *dn; 228168404Spjd dmu_buf_impl_t *db; 229185029Spjd int error; 230168404Spjd 231219089Spjd error = dnode_hold(os, object, FTAG, &dn); 232185029Spjd if (error) 233185029Spjd return (error); 234168404Spjd 235168404Spjd rw_enter(&dn->dn_struct_rwlock, RW_READER); 236168404Spjd if (dn->dn_bonus == NULL) { 237168404Spjd rw_exit(&dn->dn_struct_rwlock); 238168404Spjd rw_enter(&dn->dn_struct_rwlock, RW_WRITER); 239168404Spjd if (dn->dn_bonus == NULL) 240185029Spjd dbuf_create_bonus(dn); 241168404Spjd } 242168404Spjd db = dn->dn_bonus; 243185029Spjd 244185029Spjd /* as long as the bonus buf is held, the dnode will be held */ 245219089Spjd if (refcount_add(&db->db_holds, tag) == 1) { 246185029Spjd VERIFY(dnode_add_ref(dn, db)); 247219089Spjd (void) atomic_inc_32_nv(&dn->dn_dbufs_count); 248219089Spjd } 249185029Spjd 250219089Spjd /* 251219089Spjd * Wait to drop dn_struct_rwlock until after adding the bonus dbuf's 252219089Spjd * hold and incrementing the dbuf count to ensure that dnode_move() sees 253219089Spjd * a dnode hold for every dbuf. 254219089Spjd */ 255219089Spjd rw_exit(&dn->dn_struct_rwlock); 256219089Spjd 257168404Spjd dnode_rele(dn, FTAG); 258168404Spjd 259219089Spjd VERIFY(0 == dbuf_read(db, NULL, DB_RF_MUST_SUCCEED | DB_RF_NOPREFETCH)); 260168404Spjd 261168404Spjd *dbp = &db->db; 262168404Spjd return (0); 263168404Spjd} 264168404Spjd 265168404Spjd/* 266219089Spjd * returns ENOENT, EIO, or 0. 267219089Spjd * 268219089Spjd * This interface will allocate a blank spill dbuf when a spill blk 269219089Spjd * doesn't already exist on the dnode. 270219089Spjd * 271219089Spjd * if you only want to find an already existing spill db, then 272219089Spjd * dmu_spill_hold_existing() should be used. 273219089Spjd */ 274219089Spjdint 275219089Spjddmu_spill_hold_by_dnode(dnode_t *dn, uint32_t flags, void *tag, dmu_buf_t **dbp) 276219089Spjd{ 277219089Spjd dmu_buf_impl_t *db = NULL; 278219089Spjd int err; 279219089Spjd 280219089Spjd if ((flags & DB_RF_HAVESTRUCT) == 0) 281219089Spjd rw_enter(&dn->dn_struct_rwlock, RW_READER); 282219089Spjd 283219089Spjd db = dbuf_hold(dn, DMU_SPILL_BLKID, tag); 284219089Spjd 285219089Spjd if ((flags & DB_RF_HAVESTRUCT) == 0) 286219089Spjd rw_exit(&dn->dn_struct_rwlock); 287219089Spjd 288219089Spjd ASSERT(db != NULL); 289219089Spjd err = dbuf_read(db, NULL, flags); 290219089Spjd if (err == 0) 291219089Spjd *dbp = &db->db; 292219089Spjd else 293219089Spjd dbuf_rele(db, tag); 294219089Spjd return (err); 295219089Spjd} 296219089Spjd 297219089Spjdint 298219089Spjddmu_spill_hold_existing(dmu_buf_t *bonus, void *tag, dmu_buf_t **dbp) 299219089Spjd{ 300219089Spjd dmu_buf_impl_t *db = (dmu_buf_impl_t *)bonus; 301219089Spjd dnode_t *dn; 302219089Spjd int err; 303219089Spjd 304219089Spjd DB_DNODE_ENTER(db); 305219089Spjd dn = DB_DNODE(db); 306219089Spjd 307219089Spjd if (spa_version(dn->dn_objset->os_spa) < SPA_VERSION_SA) { 308219089Spjd err = EINVAL; 309219089Spjd } else { 310219089Spjd rw_enter(&dn->dn_struct_rwlock, RW_READER); 311219089Spjd 312219089Spjd if (!dn->dn_have_spill) { 313219089Spjd err = ENOENT; 314219089Spjd } else { 315219089Spjd err = dmu_spill_hold_by_dnode(dn, 316219089Spjd DB_RF_HAVESTRUCT | DB_RF_CANFAIL, tag, dbp); 317219089Spjd } 318219089Spjd 319219089Spjd rw_exit(&dn->dn_struct_rwlock); 320219089Spjd } 321219089Spjd 322219089Spjd DB_DNODE_EXIT(db); 323219089Spjd return (err); 324219089Spjd} 325219089Spjd 326219089Spjdint 327219089Spjddmu_spill_hold_by_bonus(dmu_buf_t *bonus, void *tag, dmu_buf_t **dbp) 328219089Spjd{ 329219089Spjd dmu_buf_impl_t *db = (dmu_buf_impl_t *)bonus; 330219089Spjd dnode_t *dn; 331219089Spjd int err; 332219089Spjd 333219089Spjd DB_DNODE_ENTER(db); 334219089Spjd dn = DB_DNODE(db); 335219089Spjd err = dmu_spill_hold_by_dnode(dn, DB_RF_CANFAIL, tag, dbp); 336219089Spjd DB_DNODE_EXIT(db); 337219089Spjd 338219089Spjd return (err); 339219089Spjd} 340219089Spjd 341219089Spjd/* 342168404Spjd * Note: longer-term, we should modify all of the dmu_buf_*() interfaces 343168404Spjd * to take a held dnode rather than <os, object> -- the lookup is wasteful, 344168404Spjd * and can induce severe lock contention when writing to several files 345168404Spjd * whose dnodes are in the same block. 346168404Spjd */ 347168404Spjdstatic int 348209962Smmdmu_buf_hold_array_by_dnode(dnode_t *dn, uint64_t offset, uint64_t length, 349209962Smm int read, void *tag, int *numbufsp, dmu_buf_t ***dbpp, uint32_t flags) 350168404Spjd{ 351185029Spjd dsl_pool_t *dp = NULL; 352168404Spjd dmu_buf_t **dbp; 353168404Spjd uint64_t blkid, nblks, i; 354209962Smm uint32_t dbuf_flags; 355168404Spjd int err; 356168404Spjd zio_t *zio; 357185029Spjd hrtime_t start; 358168404Spjd 359168404Spjd ASSERT(length <= DMU_MAX_ACCESS); 360168404Spjd 361214378Smm dbuf_flags = DB_RF_CANFAIL | DB_RF_NEVERWAIT | DB_RF_HAVESTRUCT; 362209962Smm if (flags & DMU_READ_NO_PREFETCH || length > zfetch_array_rd_sz) 363209962Smm dbuf_flags |= DB_RF_NOPREFETCH; 364168404Spjd 365168404Spjd rw_enter(&dn->dn_struct_rwlock, RW_READER); 366168404Spjd if (dn->dn_datablkshift) { 367168404Spjd int blkshift = dn->dn_datablkshift; 368168404Spjd nblks = (P2ROUNDUP(offset+length, 1ULL<<blkshift) - 369168404Spjd P2ALIGN(offset, 1ULL<<blkshift)) >> blkshift; 370168404Spjd } else { 371168404Spjd if (offset + length > dn->dn_datablksz) { 372168404Spjd zfs_panic_recover("zfs: accessing past end of object " 373168404Spjd "%llx/%llx (size=%u access=%llu+%llu)", 374168404Spjd (longlong_t)dn->dn_objset-> 375168404Spjd os_dsl_dataset->ds_object, 376168404Spjd (longlong_t)dn->dn_object, dn->dn_datablksz, 377168404Spjd (longlong_t)offset, (longlong_t)length); 378214378Smm rw_exit(&dn->dn_struct_rwlock); 379168404Spjd return (EIO); 380168404Spjd } 381168404Spjd nblks = 1; 382168404Spjd } 383168404Spjd dbp = kmem_zalloc(sizeof (dmu_buf_t *) * nblks, KM_SLEEP); 384168404Spjd 385185029Spjd if (dn->dn_objset->os_dsl_dataset) 386185029Spjd dp = dn->dn_objset->os_dsl_dataset->ds_dir->dd_pool; 387185029Spjd if (dp && dsl_pool_sync_context(dp)) 388185029Spjd start = gethrtime(); 389185029Spjd zio = zio_root(dn->dn_objset->os_spa, NULL, NULL, ZIO_FLAG_CANFAIL); 390168404Spjd blkid = dbuf_whichblock(dn, offset); 391168404Spjd for (i = 0; i < nblks; i++) { 392168404Spjd dmu_buf_impl_t *db = dbuf_hold(dn, blkid+i, tag); 393168404Spjd if (db == NULL) { 394168404Spjd rw_exit(&dn->dn_struct_rwlock); 395168404Spjd dmu_buf_rele_array(dbp, nblks, tag); 396168404Spjd zio_nowait(zio); 397168404Spjd return (EIO); 398168404Spjd } 399168404Spjd /* initiate async i/o */ 400226620Spjd if (read) 401209962Smm (void) dbuf_read(db, zio, dbuf_flags); 402226620Spjd#ifdef _KERNEL 403226620Spjd else 404226620Spjd curthread->td_ru.ru_oublock++; 405226620Spjd#endif 406168404Spjd dbp[i] = &db->db; 407168404Spjd } 408168404Spjd rw_exit(&dn->dn_struct_rwlock); 409168404Spjd 410168404Spjd /* wait for async i/o */ 411168404Spjd err = zio_wait(zio); 412185029Spjd /* track read overhead when we are in sync context */ 413185029Spjd if (dp && dsl_pool_sync_context(dp)) 414185029Spjd dp->dp_read_overhead += gethrtime() - start; 415168404Spjd if (err) { 416168404Spjd dmu_buf_rele_array(dbp, nblks, tag); 417168404Spjd return (err); 418168404Spjd } 419168404Spjd 420168404Spjd /* wait for other io to complete */ 421168404Spjd if (read) { 422168404Spjd for (i = 0; i < nblks; i++) { 423168404Spjd dmu_buf_impl_t *db = (dmu_buf_impl_t *)dbp[i]; 424168404Spjd mutex_enter(&db->db_mtx); 425168404Spjd while (db->db_state == DB_READ || 426168404Spjd db->db_state == DB_FILL) 427168404Spjd cv_wait(&db->db_changed, &db->db_mtx); 428168404Spjd if (db->db_state == DB_UNCACHED) 429168404Spjd err = EIO; 430168404Spjd mutex_exit(&db->db_mtx); 431168404Spjd if (err) { 432168404Spjd dmu_buf_rele_array(dbp, nblks, tag); 433168404Spjd return (err); 434168404Spjd } 435168404Spjd } 436168404Spjd } 437168404Spjd 438168404Spjd *numbufsp = nblks; 439168404Spjd *dbpp = dbp; 440168404Spjd return (0); 441168404Spjd} 442168404Spjd 443168404Spjdstatic int 444168404Spjddmu_buf_hold_array(objset_t *os, uint64_t object, uint64_t offset, 445168404Spjd uint64_t length, int read, void *tag, int *numbufsp, dmu_buf_t ***dbpp) 446168404Spjd{ 447168404Spjd dnode_t *dn; 448168404Spjd int err; 449168404Spjd 450219089Spjd err = dnode_hold(os, object, FTAG, &dn); 451168404Spjd if (err) 452168404Spjd return (err); 453168404Spjd 454168404Spjd err = dmu_buf_hold_array_by_dnode(dn, offset, length, read, tag, 455209962Smm numbufsp, dbpp, DMU_READ_PREFETCH); 456168404Spjd 457168404Spjd dnode_rele(dn, FTAG); 458168404Spjd 459168404Spjd return (err); 460168404Spjd} 461168404Spjd 462168404Spjdint 463219089Spjddmu_buf_hold_array_by_bonus(dmu_buf_t *db_fake, uint64_t offset, 464168404Spjd uint64_t length, int read, void *tag, int *numbufsp, dmu_buf_t ***dbpp) 465168404Spjd{ 466219089Spjd dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 467219089Spjd dnode_t *dn; 468168404Spjd int err; 469168404Spjd 470219089Spjd DB_DNODE_ENTER(db); 471219089Spjd dn = DB_DNODE(db); 472168404Spjd err = dmu_buf_hold_array_by_dnode(dn, offset, length, read, tag, 473209962Smm numbufsp, dbpp, DMU_READ_PREFETCH); 474219089Spjd DB_DNODE_EXIT(db); 475168404Spjd 476168404Spjd return (err); 477168404Spjd} 478168404Spjd 479168404Spjdvoid 480168404Spjddmu_buf_rele_array(dmu_buf_t **dbp_fake, int numbufs, void *tag) 481168404Spjd{ 482168404Spjd int i; 483168404Spjd dmu_buf_impl_t **dbp = (dmu_buf_impl_t **)dbp_fake; 484168404Spjd 485168404Spjd if (numbufs == 0) 486168404Spjd return; 487168404Spjd 488168404Spjd for (i = 0; i < numbufs; i++) { 489168404Spjd if (dbp[i]) 490168404Spjd dbuf_rele(dbp[i], tag); 491168404Spjd } 492168404Spjd 493168404Spjd kmem_free(dbp, sizeof (dmu_buf_t *) * numbufs); 494168404Spjd} 495168404Spjd 496168404Spjdvoid 497168404Spjddmu_prefetch(objset_t *os, uint64_t object, uint64_t offset, uint64_t len) 498168404Spjd{ 499168404Spjd dnode_t *dn; 500168404Spjd uint64_t blkid; 501168404Spjd int nblks, i, err; 502168404Spjd 503194043Skmacy if (zfs_prefetch_disable) 504168404Spjd return; 505168404Spjd 506168404Spjd if (len == 0) { /* they're interested in the bonus buffer */ 507219089Spjd dn = DMU_META_DNODE(os); 508168404Spjd 509168404Spjd if (object == 0 || object >= DN_MAX_OBJECT) 510168404Spjd return; 511168404Spjd 512168404Spjd rw_enter(&dn->dn_struct_rwlock, RW_READER); 513168404Spjd blkid = dbuf_whichblock(dn, object * sizeof (dnode_phys_t)); 514168404Spjd dbuf_prefetch(dn, blkid); 515168404Spjd rw_exit(&dn->dn_struct_rwlock); 516168404Spjd return; 517168404Spjd } 518168404Spjd 519168404Spjd /* 520168404Spjd * XXX - Note, if the dnode for the requested object is not 521168404Spjd * already cached, we will do a *synchronous* read in the 522168404Spjd * dnode_hold() call. The same is true for any indirects. 523168404Spjd */ 524219089Spjd err = dnode_hold(os, object, FTAG, &dn); 525168404Spjd if (err != 0) 526168404Spjd return; 527168404Spjd 528168404Spjd rw_enter(&dn->dn_struct_rwlock, RW_READER); 529168404Spjd if (dn->dn_datablkshift) { 530168404Spjd int blkshift = dn->dn_datablkshift; 531168404Spjd nblks = (P2ROUNDUP(offset+len, 1<<blkshift) - 532168404Spjd P2ALIGN(offset, 1<<blkshift)) >> blkshift; 533168404Spjd } else { 534168404Spjd nblks = (offset < dn->dn_datablksz); 535168404Spjd } 536168404Spjd 537168404Spjd if (nblks != 0) { 538168404Spjd blkid = dbuf_whichblock(dn, offset); 539168404Spjd for (i = 0; i < nblks; i++) 540168404Spjd dbuf_prefetch(dn, blkid+i); 541168404Spjd } 542168404Spjd 543168404Spjd rw_exit(&dn->dn_struct_rwlock); 544168404Spjd 545168404Spjd dnode_rele(dn, FTAG); 546168404Spjd} 547168404Spjd 548208775Smm/* 549208775Smm * Get the next "chunk" of file data to free. We traverse the file from 550208775Smm * the end so that the file gets shorter over time (if we crashes in the 551208775Smm * middle, this will leave us in a better state). We find allocated file 552208775Smm * data by simply searching the allocated level 1 indirects. 553208775Smm */ 554185029Spjdstatic int 555208775Smmget_next_chunk(dnode_t *dn, uint64_t *start, uint64_t limit) 556185029Spjd{ 557208775Smm uint64_t len = *start - limit; 558208775Smm uint64_t blkcnt = 0; 559208775Smm uint64_t maxblks = DMU_MAX_ACCESS / (1ULL << (dn->dn_indblkshift + 1)); 560208775Smm uint64_t iblkrange = 561185029Spjd dn->dn_datablksz * EPB(dn->dn_indblkshift, SPA_BLKPTRSHIFT); 562185029Spjd 563208775Smm ASSERT(limit <= *start); 564185029Spjd 565208775Smm if (len <= iblkrange * maxblks) { 566208775Smm *start = limit; 567185029Spjd return (0); 568185029Spjd } 569208775Smm ASSERT(ISP2(iblkrange)); 570185029Spjd 571208775Smm while (*start > limit && blkcnt < maxblks) { 572185029Spjd int err; 573185029Spjd 574208775Smm /* find next allocated L1 indirect */ 575185029Spjd err = dnode_next_offset(dn, 576208775Smm DNODE_FIND_BACKWARDS, start, 2, 1, 0); 577185029Spjd 578208775Smm /* if there are no more, then we are done */ 579208775Smm if (err == ESRCH) { 580208775Smm *start = limit; 581185029Spjd return (0); 582208775Smm } else if (err) { 583208775Smm return (err); 584185029Spjd } 585208775Smm blkcnt += 1; 586185029Spjd 587208775Smm /* reset offset to end of "next" block back */ 588208775Smm *start = P2ALIGN(*start, iblkrange); 589208775Smm if (*start <= limit) 590208775Smm *start = limit; 591208775Smm else 592208775Smm *start -= 1; 593185029Spjd } 594185029Spjd return (0); 595185029Spjd} 596185029Spjd 597185029Spjdstatic int 598185029Spjddmu_free_long_range_impl(objset_t *os, dnode_t *dn, uint64_t offset, 599185029Spjd uint64_t length, boolean_t free_dnode) 600185029Spjd{ 601185029Spjd dmu_tx_t *tx; 602185029Spjd uint64_t object_size, start, end, len; 603185029Spjd boolean_t trunc = (length == DMU_OBJECT_END); 604185029Spjd int align, err; 605185029Spjd 606185029Spjd align = 1 << dn->dn_datablkshift; 607185029Spjd ASSERT(align > 0); 608185029Spjd object_size = align == 1 ? dn->dn_datablksz : 609185029Spjd (dn->dn_maxblkid + 1) << dn->dn_datablkshift; 610185029Spjd 611209962Smm end = offset + length; 612209962Smm if (trunc || end > object_size) 613185029Spjd end = object_size; 614185029Spjd if (end <= offset) 615185029Spjd return (0); 616185029Spjd length = end - offset; 617185029Spjd 618185029Spjd while (length) { 619185029Spjd start = end; 620209962Smm /* assert(offset <= start) */ 621185029Spjd err = get_next_chunk(dn, &start, offset); 622185029Spjd if (err) 623185029Spjd return (err); 624185029Spjd len = trunc ? DMU_OBJECT_END : end - start; 625185029Spjd 626185029Spjd tx = dmu_tx_create(os); 627185029Spjd dmu_tx_hold_free(tx, dn->dn_object, start, len); 628185029Spjd err = dmu_tx_assign(tx, TXG_WAIT); 629185029Spjd if (err) { 630185029Spjd dmu_tx_abort(tx); 631185029Spjd return (err); 632185029Spjd } 633185029Spjd 634185029Spjd dnode_free_range(dn, start, trunc ? -1 : len, tx); 635185029Spjd 636185029Spjd if (start == 0 && free_dnode) { 637185029Spjd ASSERT(trunc); 638185029Spjd dnode_free(dn, tx); 639185029Spjd } 640185029Spjd 641185029Spjd length -= end - start; 642185029Spjd 643185029Spjd dmu_tx_commit(tx); 644185029Spjd end = start; 645185029Spjd } 646185029Spjd return (0); 647185029Spjd} 648185029Spjd 649168404Spjdint 650185029Spjddmu_free_long_range(objset_t *os, uint64_t object, 651185029Spjd uint64_t offset, uint64_t length) 652185029Spjd{ 653185029Spjd dnode_t *dn; 654185029Spjd int err; 655185029Spjd 656219089Spjd err = dnode_hold(os, object, FTAG, &dn); 657185029Spjd if (err != 0) 658185029Spjd return (err); 659185029Spjd err = dmu_free_long_range_impl(os, dn, offset, length, FALSE); 660185029Spjd dnode_rele(dn, FTAG); 661185029Spjd return (err); 662185029Spjd} 663185029Spjd 664185029Spjdint 665185029Spjddmu_free_object(objset_t *os, uint64_t object) 666185029Spjd{ 667185029Spjd dnode_t *dn; 668185029Spjd dmu_tx_t *tx; 669185029Spjd int err; 670185029Spjd 671219089Spjd err = dnode_hold_impl(os, object, DNODE_MUST_BE_ALLOCATED, 672185029Spjd FTAG, &dn); 673185029Spjd if (err != 0) 674185029Spjd return (err); 675185029Spjd if (dn->dn_nlevels == 1) { 676185029Spjd tx = dmu_tx_create(os); 677185029Spjd dmu_tx_hold_bonus(tx, object); 678185029Spjd dmu_tx_hold_free(tx, dn->dn_object, 0, DMU_OBJECT_END); 679185029Spjd err = dmu_tx_assign(tx, TXG_WAIT); 680185029Spjd if (err == 0) { 681185029Spjd dnode_free_range(dn, 0, DMU_OBJECT_END, tx); 682185029Spjd dnode_free(dn, tx); 683185029Spjd dmu_tx_commit(tx); 684185029Spjd } else { 685185029Spjd dmu_tx_abort(tx); 686185029Spjd } 687185029Spjd } else { 688185029Spjd err = dmu_free_long_range_impl(os, dn, 0, DMU_OBJECT_END, TRUE); 689185029Spjd } 690185029Spjd dnode_rele(dn, FTAG); 691185029Spjd return (err); 692185029Spjd} 693185029Spjd 694185029Spjdint 695168404Spjddmu_free_range(objset_t *os, uint64_t object, uint64_t offset, 696168404Spjd uint64_t size, dmu_tx_t *tx) 697168404Spjd{ 698168404Spjd dnode_t *dn; 699219089Spjd int err = dnode_hold(os, object, FTAG, &dn); 700168404Spjd if (err) 701168404Spjd return (err); 702168404Spjd ASSERT(offset < UINT64_MAX); 703168404Spjd ASSERT(size == -1ULL || size <= UINT64_MAX - offset); 704168404Spjd dnode_free_range(dn, offset, size, tx); 705168404Spjd dnode_rele(dn, FTAG); 706168404Spjd return (0); 707168404Spjd} 708168404Spjd 709168404Spjdint 710168404Spjddmu_read(objset_t *os, uint64_t object, uint64_t offset, uint64_t size, 711209962Smm void *buf, uint32_t flags) 712168404Spjd{ 713168404Spjd dnode_t *dn; 714168404Spjd dmu_buf_t **dbp; 715214378Smm int numbufs, err; 716168404Spjd 717219089Spjd err = dnode_hold(os, object, FTAG, &dn); 718168404Spjd if (err) 719168404Spjd return (err); 720168404Spjd 721168404Spjd /* 722168404Spjd * Deal with odd block sizes, where there can't be data past the first 723168404Spjd * block. If we ever do the tail block optimization, we will need to 724168404Spjd * handle that here as well. 725168404Spjd */ 726214378Smm if (dn->dn_maxblkid == 0) { 727168404Spjd int newsz = offset > dn->dn_datablksz ? 0 : 728168404Spjd MIN(size, dn->dn_datablksz - offset); 729168404Spjd bzero((char *)buf + newsz, size - newsz); 730168404Spjd size = newsz; 731168404Spjd } 732168404Spjd 733168404Spjd while (size > 0) { 734168404Spjd uint64_t mylen = MIN(size, DMU_MAX_ACCESS / 2); 735214378Smm int i; 736168404Spjd 737168404Spjd /* 738168404Spjd * NB: we could do this block-at-a-time, but it's nice 739168404Spjd * to be reading in parallel. 740168404Spjd */ 741168404Spjd err = dmu_buf_hold_array_by_dnode(dn, offset, mylen, 742209962Smm TRUE, FTAG, &numbufs, &dbp, flags); 743168404Spjd if (err) 744185029Spjd break; 745168404Spjd 746168404Spjd for (i = 0; i < numbufs; i++) { 747168404Spjd int tocpy; 748168404Spjd int bufoff; 749168404Spjd dmu_buf_t *db = dbp[i]; 750168404Spjd 751168404Spjd ASSERT(size > 0); 752168404Spjd 753168404Spjd bufoff = offset - db->db_offset; 754168404Spjd tocpy = (int)MIN(db->db_size - bufoff, size); 755168404Spjd 756168404Spjd bcopy((char *)db->db_data + bufoff, buf, tocpy); 757168404Spjd 758168404Spjd offset += tocpy; 759168404Spjd size -= tocpy; 760168404Spjd buf = (char *)buf + tocpy; 761168404Spjd } 762168404Spjd dmu_buf_rele_array(dbp, numbufs, FTAG); 763168404Spjd } 764168404Spjd dnode_rele(dn, FTAG); 765185029Spjd return (err); 766168404Spjd} 767168404Spjd 768168404Spjdvoid 769168404Spjddmu_write(objset_t *os, uint64_t object, uint64_t offset, uint64_t size, 770168404Spjd const void *buf, dmu_tx_t *tx) 771168404Spjd{ 772168404Spjd dmu_buf_t **dbp; 773168404Spjd int numbufs, i; 774168404Spjd 775168404Spjd if (size == 0) 776168404Spjd return; 777168404Spjd 778168404Spjd VERIFY(0 == dmu_buf_hold_array(os, object, offset, size, 779168404Spjd FALSE, FTAG, &numbufs, &dbp)); 780168404Spjd 781168404Spjd for (i = 0; i < numbufs; i++) { 782168404Spjd int tocpy; 783168404Spjd int bufoff; 784168404Spjd dmu_buf_t *db = dbp[i]; 785168404Spjd 786168404Spjd ASSERT(size > 0); 787168404Spjd 788168404Spjd bufoff = offset - db->db_offset; 789168404Spjd tocpy = (int)MIN(db->db_size - bufoff, size); 790168404Spjd 791168404Spjd ASSERT(i == 0 || i == numbufs-1 || tocpy == db->db_size); 792168404Spjd 793168404Spjd if (tocpy == db->db_size) 794168404Spjd dmu_buf_will_fill(db, tx); 795168404Spjd else 796168404Spjd dmu_buf_will_dirty(db, tx); 797168404Spjd 798168404Spjd bcopy(buf, (char *)db->db_data + bufoff, tocpy); 799168404Spjd 800168404Spjd if (tocpy == db->db_size) 801168404Spjd dmu_buf_fill_done(db, tx); 802168404Spjd 803168404Spjd offset += tocpy; 804168404Spjd size -= tocpy; 805168404Spjd buf = (char *)buf + tocpy; 806168404Spjd } 807168404Spjd dmu_buf_rele_array(dbp, numbufs, FTAG); 808168404Spjd} 809168404Spjd 810219089Spjdvoid 811219089Spjddmu_prealloc(objset_t *os, uint64_t object, uint64_t offset, uint64_t size, 812219089Spjd dmu_tx_t *tx) 813219089Spjd{ 814219089Spjd dmu_buf_t **dbp; 815219089Spjd int numbufs, i; 816219089Spjd 817219089Spjd if (size == 0) 818219089Spjd return; 819219089Spjd 820219089Spjd VERIFY(0 == dmu_buf_hold_array(os, object, offset, size, 821219089Spjd FALSE, FTAG, &numbufs, &dbp)); 822219089Spjd 823219089Spjd for (i = 0; i < numbufs; i++) { 824219089Spjd dmu_buf_t *db = dbp[i]; 825219089Spjd 826219089Spjd dmu_buf_will_not_fill(db, tx); 827219089Spjd } 828219089Spjd dmu_buf_rele_array(dbp, numbufs, FTAG); 829219089Spjd} 830219089Spjd 831219089Spjd/* 832219089Spjd * DMU support for xuio 833219089Spjd */ 834219089Spjdkstat_t *xuio_ksp = NULL; 835219089Spjd 836219089Spjdint 837219089Spjddmu_xuio_init(xuio_t *xuio, int nblk) 838219089Spjd{ 839219089Spjd dmu_xuio_t *priv; 840219089Spjd uio_t *uio = &xuio->xu_uio; 841219089Spjd 842219089Spjd uio->uio_iovcnt = nblk; 843219089Spjd uio->uio_iov = kmem_zalloc(nblk * sizeof (iovec_t), KM_SLEEP); 844219089Spjd 845219089Spjd priv = kmem_zalloc(sizeof (dmu_xuio_t), KM_SLEEP); 846219089Spjd priv->cnt = nblk; 847219089Spjd priv->bufs = kmem_zalloc(nblk * sizeof (arc_buf_t *), KM_SLEEP); 848219089Spjd priv->iovp = uio->uio_iov; 849219089Spjd XUIO_XUZC_PRIV(xuio) = priv; 850219089Spjd 851219089Spjd if (XUIO_XUZC_RW(xuio) == UIO_READ) 852219089Spjd XUIOSTAT_INCR(xuiostat_onloan_rbuf, nblk); 853219089Spjd else 854219089Spjd XUIOSTAT_INCR(xuiostat_onloan_wbuf, nblk); 855219089Spjd 856219089Spjd return (0); 857219089Spjd} 858219089Spjd 859219089Spjdvoid 860219089Spjddmu_xuio_fini(xuio_t *xuio) 861219089Spjd{ 862219089Spjd dmu_xuio_t *priv = XUIO_XUZC_PRIV(xuio); 863219089Spjd int nblk = priv->cnt; 864219089Spjd 865219089Spjd kmem_free(priv->iovp, nblk * sizeof (iovec_t)); 866219089Spjd kmem_free(priv->bufs, nblk * sizeof (arc_buf_t *)); 867219089Spjd kmem_free(priv, sizeof (dmu_xuio_t)); 868219089Spjd 869219089Spjd if (XUIO_XUZC_RW(xuio) == UIO_READ) 870219089Spjd XUIOSTAT_INCR(xuiostat_onloan_rbuf, -nblk); 871219089Spjd else 872219089Spjd XUIOSTAT_INCR(xuiostat_onloan_wbuf, -nblk); 873219089Spjd} 874219089Spjd 875219089Spjd/* 876219089Spjd * Initialize iov[priv->next] and priv->bufs[priv->next] with { off, n, abuf } 877219089Spjd * and increase priv->next by 1. 878219089Spjd */ 879219089Spjdint 880219089Spjddmu_xuio_add(xuio_t *xuio, arc_buf_t *abuf, offset_t off, size_t n) 881219089Spjd{ 882219089Spjd struct iovec *iov; 883219089Spjd uio_t *uio = &xuio->xu_uio; 884219089Spjd dmu_xuio_t *priv = XUIO_XUZC_PRIV(xuio); 885219089Spjd int i = priv->next++; 886219089Spjd 887219089Spjd ASSERT(i < priv->cnt); 888219089Spjd ASSERT(off + n <= arc_buf_size(abuf)); 889219089Spjd iov = uio->uio_iov + i; 890219089Spjd iov->iov_base = (char *)abuf->b_data + off; 891219089Spjd iov->iov_len = n; 892219089Spjd priv->bufs[i] = abuf; 893219089Spjd return (0); 894219089Spjd} 895219089Spjd 896219089Spjdint 897219089Spjddmu_xuio_cnt(xuio_t *xuio) 898219089Spjd{ 899219089Spjd dmu_xuio_t *priv = XUIO_XUZC_PRIV(xuio); 900219089Spjd return (priv->cnt); 901219089Spjd} 902219089Spjd 903219089Spjdarc_buf_t * 904219089Spjddmu_xuio_arcbuf(xuio_t *xuio, int i) 905219089Spjd{ 906219089Spjd dmu_xuio_t *priv = XUIO_XUZC_PRIV(xuio); 907219089Spjd 908219089Spjd ASSERT(i < priv->cnt); 909219089Spjd return (priv->bufs[i]); 910219089Spjd} 911219089Spjd 912219089Spjdvoid 913219089Spjddmu_xuio_clear(xuio_t *xuio, int i) 914219089Spjd{ 915219089Spjd dmu_xuio_t *priv = XUIO_XUZC_PRIV(xuio); 916219089Spjd 917219089Spjd ASSERT(i < priv->cnt); 918219089Spjd priv->bufs[i] = NULL; 919219089Spjd} 920219089Spjd 921219089Spjdstatic void 922219089Spjdxuio_stat_init(void) 923219089Spjd{ 924219089Spjd xuio_ksp = kstat_create("zfs", 0, "xuio_stats", "misc", 925219089Spjd KSTAT_TYPE_NAMED, sizeof (xuio_stats) / sizeof (kstat_named_t), 926219089Spjd KSTAT_FLAG_VIRTUAL); 927219089Spjd if (xuio_ksp != NULL) { 928219089Spjd xuio_ksp->ks_data = &xuio_stats; 929219089Spjd kstat_install(xuio_ksp); 930219089Spjd } 931219089Spjd} 932219089Spjd 933219089Spjdstatic void 934219089Spjdxuio_stat_fini(void) 935219089Spjd{ 936219089Spjd if (xuio_ksp != NULL) { 937219089Spjd kstat_delete(xuio_ksp); 938219089Spjd xuio_ksp = NULL; 939219089Spjd } 940219089Spjd} 941219089Spjd 942219089Spjdvoid 943219089Spjdxuio_stat_wbuf_copied() 944219089Spjd{ 945219089Spjd XUIOSTAT_BUMP(xuiostat_wbuf_copied); 946219089Spjd} 947219089Spjd 948219089Spjdvoid 949219089Spjdxuio_stat_wbuf_nocopy() 950219089Spjd{ 951219089Spjd XUIOSTAT_BUMP(xuiostat_wbuf_nocopy); 952219089Spjd} 953219089Spjd 954168404Spjd#ifdef _KERNEL 955168404Spjdint 956168404Spjddmu_read_uio(objset_t *os, uint64_t object, uio_t *uio, uint64_t size) 957168404Spjd{ 958168404Spjd dmu_buf_t **dbp; 959168404Spjd int numbufs, i, err; 960219089Spjd xuio_t *xuio = NULL; 961168404Spjd 962168404Spjd /* 963168404Spjd * NB: we could do this block-at-a-time, but it's nice 964168404Spjd * to be reading in parallel. 965168404Spjd */ 966168404Spjd err = dmu_buf_hold_array(os, object, uio->uio_loffset, size, TRUE, FTAG, 967168404Spjd &numbufs, &dbp); 968168404Spjd if (err) 969168404Spjd return (err); 970168404Spjd 971219089Spjd#ifdef UIO_XUIO 972219089Spjd if (uio->uio_extflg == UIO_XUIO) 973219089Spjd xuio = (xuio_t *)uio; 974219089Spjd#endif 975219089Spjd 976168404Spjd for (i = 0; i < numbufs; i++) { 977168404Spjd int tocpy; 978168404Spjd int bufoff; 979168404Spjd dmu_buf_t *db = dbp[i]; 980168404Spjd 981168404Spjd ASSERT(size > 0); 982168404Spjd 983168404Spjd bufoff = uio->uio_loffset - db->db_offset; 984168404Spjd tocpy = (int)MIN(db->db_size - bufoff, size); 985168404Spjd 986219089Spjd if (xuio) { 987219089Spjd dmu_buf_impl_t *dbi = (dmu_buf_impl_t *)db; 988219089Spjd arc_buf_t *dbuf_abuf = dbi->db_buf; 989219089Spjd arc_buf_t *abuf = dbuf_loan_arcbuf(dbi); 990219089Spjd err = dmu_xuio_add(xuio, abuf, bufoff, tocpy); 991219089Spjd if (!err) { 992219089Spjd uio->uio_resid -= tocpy; 993219089Spjd uio->uio_loffset += tocpy; 994219089Spjd } 995219089Spjd 996219089Spjd if (abuf == dbuf_abuf) 997219089Spjd XUIOSTAT_BUMP(xuiostat_rbuf_nocopy); 998219089Spjd else 999219089Spjd XUIOSTAT_BUMP(xuiostat_rbuf_copied); 1000219089Spjd } else { 1001219089Spjd err = uiomove((char *)db->db_data + bufoff, tocpy, 1002219089Spjd UIO_READ, uio); 1003219089Spjd } 1004168404Spjd if (err) 1005168404Spjd break; 1006168404Spjd 1007168404Spjd size -= tocpy; 1008168404Spjd } 1009168404Spjd dmu_buf_rele_array(dbp, numbufs, FTAG); 1010168404Spjd 1011168404Spjd return (err); 1012168404Spjd} 1013168404Spjd 1014219089Spjdstatic int 1015219089Spjddmu_write_uio_dnode(dnode_t *dn, uio_t *uio, uint64_t size, dmu_tx_t *tx) 1016168404Spjd{ 1017168404Spjd dmu_buf_t **dbp; 1018219089Spjd int numbufs; 1019168404Spjd int err = 0; 1020219089Spjd int i; 1021168404Spjd 1022219089Spjd err = dmu_buf_hold_array_by_dnode(dn, uio->uio_loffset, size, 1023219089Spjd FALSE, FTAG, &numbufs, &dbp, DMU_READ_PREFETCH); 1024168404Spjd if (err) 1025168404Spjd return (err); 1026168404Spjd 1027168404Spjd for (i = 0; i < numbufs; i++) { 1028168404Spjd int tocpy; 1029168404Spjd int bufoff; 1030168404Spjd dmu_buf_t *db = dbp[i]; 1031168404Spjd 1032168404Spjd ASSERT(size > 0); 1033168404Spjd 1034168404Spjd bufoff = uio->uio_loffset - db->db_offset; 1035168404Spjd tocpy = (int)MIN(db->db_size - bufoff, size); 1036168404Spjd 1037168404Spjd ASSERT(i == 0 || i == numbufs-1 || tocpy == db->db_size); 1038168404Spjd 1039168404Spjd if (tocpy == db->db_size) 1040168404Spjd dmu_buf_will_fill(db, tx); 1041168404Spjd else 1042168404Spjd dmu_buf_will_dirty(db, tx); 1043168404Spjd 1044168404Spjd /* 1045168404Spjd * XXX uiomove could block forever (eg. nfs-backed 1046168404Spjd * pages). There needs to be a uiolockdown() function 1047168404Spjd * to lock the pages in memory, so that uiomove won't 1048168404Spjd * block. 1049168404Spjd */ 1050168404Spjd err = uiomove((char *)db->db_data + bufoff, tocpy, 1051168404Spjd UIO_WRITE, uio); 1052168404Spjd 1053168404Spjd if (tocpy == db->db_size) 1054168404Spjd dmu_buf_fill_done(db, tx); 1055168404Spjd 1056168404Spjd if (err) 1057168404Spjd break; 1058168404Spjd 1059168404Spjd size -= tocpy; 1060168404Spjd } 1061219089Spjd 1062168404Spjd dmu_buf_rele_array(dbp, numbufs, FTAG); 1063168404Spjd return (err); 1064168404Spjd} 1065168404Spjd 1066168404Spjdint 1067219089Spjddmu_write_uio_dbuf(dmu_buf_t *zdb, uio_t *uio, uint64_t size, 1068219089Spjd dmu_tx_t *tx) 1069219089Spjd{ 1070219089Spjd dmu_buf_impl_t *db = (dmu_buf_impl_t *)zdb; 1071219089Spjd dnode_t *dn; 1072219089Spjd int err; 1073219089Spjd 1074219089Spjd if (size == 0) 1075219089Spjd return (0); 1076219089Spjd 1077219089Spjd DB_DNODE_ENTER(db); 1078219089Spjd dn = DB_DNODE(db); 1079219089Spjd err = dmu_write_uio_dnode(dn, uio, size, tx); 1080219089Spjd DB_DNODE_EXIT(db); 1081219089Spjd 1082219089Spjd return (err); 1083219089Spjd} 1084219089Spjd 1085219089Spjdint 1086219089Spjddmu_write_uio(objset_t *os, uint64_t object, uio_t *uio, uint64_t size, 1087219089Spjd dmu_tx_t *tx) 1088219089Spjd{ 1089219089Spjd dnode_t *dn; 1090219089Spjd int err; 1091219089Spjd 1092219089Spjd if (size == 0) 1093219089Spjd return (0); 1094219089Spjd 1095219089Spjd err = dnode_hold(os, object, FTAG, &dn); 1096219089Spjd if (err) 1097219089Spjd return (err); 1098219089Spjd 1099219089Spjd err = dmu_write_uio_dnode(dn, uio, size, tx); 1100219089Spjd 1101219089Spjd dnode_rele(dn, FTAG); 1102219089Spjd 1103219089Spjd return (err); 1104219089Spjd} 1105219089Spjd 1106219089Spjd#ifdef sun 1107219089Spjdint 1108168404Spjddmu_write_pages(objset_t *os, uint64_t object, uint64_t offset, uint64_t size, 1109168404Spjd page_t *pp, dmu_tx_t *tx) 1110168404Spjd{ 1111168404Spjd dmu_buf_t **dbp; 1112168404Spjd int numbufs, i; 1113168404Spjd int err; 1114168404Spjd 1115168404Spjd if (size == 0) 1116168404Spjd return (0); 1117168404Spjd 1118168404Spjd err = dmu_buf_hold_array(os, object, offset, size, 1119168404Spjd FALSE, FTAG, &numbufs, &dbp); 1120168404Spjd if (err) 1121168404Spjd return (err); 1122168404Spjd 1123168404Spjd for (i = 0; i < numbufs; i++) { 1124168404Spjd int tocpy, copied, thiscpy; 1125168404Spjd int bufoff; 1126168404Spjd dmu_buf_t *db = dbp[i]; 1127168404Spjd caddr_t va; 1128168404Spjd 1129168404Spjd ASSERT(size > 0); 1130168404Spjd ASSERT3U(db->db_size, >=, PAGESIZE); 1131168404Spjd 1132168404Spjd bufoff = offset - db->db_offset; 1133168404Spjd tocpy = (int)MIN(db->db_size - bufoff, size); 1134168404Spjd 1135168404Spjd ASSERT(i == 0 || i == numbufs-1 || tocpy == db->db_size); 1136168404Spjd 1137168404Spjd if (tocpy == db->db_size) 1138168404Spjd dmu_buf_will_fill(db, tx); 1139168404Spjd else 1140168404Spjd dmu_buf_will_dirty(db, tx); 1141168404Spjd 1142168404Spjd for (copied = 0; copied < tocpy; copied += PAGESIZE) { 1143168404Spjd ASSERT3U(pp->p_offset, ==, db->db_offset + bufoff); 1144168404Spjd thiscpy = MIN(PAGESIZE, tocpy - copied); 1145185029Spjd va = zfs_map_page(pp, S_READ); 1146168404Spjd bcopy(va, (char *)db->db_data + bufoff, thiscpy); 1147185029Spjd zfs_unmap_page(pp, va); 1148168404Spjd pp = pp->p_next; 1149168404Spjd bufoff += PAGESIZE; 1150168404Spjd } 1151168404Spjd 1152168404Spjd if (tocpy == db->db_size) 1153168404Spjd dmu_buf_fill_done(db, tx); 1154168404Spjd 1155168404Spjd offset += tocpy; 1156168404Spjd size -= tocpy; 1157168404Spjd } 1158168404Spjd dmu_buf_rele_array(dbp, numbufs, FTAG); 1159168404Spjd return (err); 1160168404Spjd} 1161219089Spjd#endif /* sun */ 1162219089Spjd#endif 1163168404Spjd 1164209962Smm/* 1165209962Smm * Allocate a loaned anonymous arc buffer. 1166209962Smm */ 1167209962Smmarc_buf_t * 1168209962Smmdmu_request_arcbuf(dmu_buf_t *handle, int size) 1169209962Smm{ 1170219089Spjd dmu_buf_impl_t *db = (dmu_buf_impl_t *)handle; 1171219089Spjd spa_t *spa; 1172209962Smm 1173219089Spjd DB_GET_SPA(&spa, db); 1174219089Spjd return (arc_loan_buf(spa, size)); 1175209962Smm} 1176209962Smm 1177209962Smm/* 1178209962Smm * Free a loaned arc buffer. 1179209962Smm */ 1180209962Smmvoid 1181209962Smmdmu_return_arcbuf(arc_buf_t *buf) 1182209962Smm{ 1183209962Smm arc_return_buf(buf, FTAG); 1184209962Smm VERIFY(arc_buf_remove_ref(buf, FTAG) == 1); 1185209962Smm} 1186209962Smm 1187209962Smm/* 1188209962Smm * When possible directly assign passed loaned arc buffer to a dbuf. 1189209962Smm * If this is not possible copy the contents of passed arc buf via 1190209962Smm * dmu_write(). 1191209962Smm */ 1192209962Smmvoid 1193209962Smmdmu_assign_arcbuf(dmu_buf_t *handle, uint64_t offset, arc_buf_t *buf, 1194209962Smm dmu_tx_t *tx) 1195209962Smm{ 1196219089Spjd dmu_buf_impl_t *dbuf = (dmu_buf_impl_t *)handle; 1197219089Spjd dnode_t *dn; 1198209962Smm dmu_buf_impl_t *db; 1199209962Smm uint32_t blksz = (uint32_t)arc_buf_size(buf); 1200209962Smm uint64_t blkid; 1201209962Smm 1202219089Spjd DB_DNODE_ENTER(dbuf); 1203219089Spjd dn = DB_DNODE(dbuf); 1204209962Smm rw_enter(&dn->dn_struct_rwlock, RW_READER); 1205209962Smm blkid = dbuf_whichblock(dn, offset); 1206209962Smm VERIFY((db = dbuf_hold(dn, blkid, FTAG)) != NULL); 1207209962Smm rw_exit(&dn->dn_struct_rwlock); 1208219089Spjd DB_DNODE_EXIT(dbuf); 1209209962Smm 1210209962Smm if (offset == db->db.db_offset && blksz == db->db.db_size) { 1211209962Smm dbuf_assign_arcbuf(db, buf, tx); 1212209962Smm dbuf_rele(db, FTAG); 1213209962Smm } else { 1214219089Spjd objset_t *os; 1215219089Spjd uint64_t object; 1216219089Spjd 1217219089Spjd DB_DNODE_ENTER(dbuf); 1218219089Spjd dn = DB_DNODE(dbuf); 1219219089Spjd os = dn->dn_objset; 1220219089Spjd object = dn->dn_object; 1221219089Spjd DB_DNODE_EXIT(dbuf); 1222219089Spjd 1223209962Smm dbuf_rele(db, FTAG); 1224219089Spjd dmu_write(os, object, offset, blksz, buf->b_data, tx); 1225209962Smm dmu_return_arcbuf(buf); 1226219089Spjd XUIOSTAT_BUMP(xuiostat_wbuf_copied); 1227209962Smm } 1228209962Smm} 1229209962Smm 1230168404Spjdtypedef struct { 1231219089Spjd dbuf_dirty_record_t *dsa_dr; 1232219089Spjd dmu_sync_cb_t *dsa_done; 1233219089Spjd zgd_t *dsa_zgd; 1234219089Spjd dmu_tx_t *dsa_tx; 1235168404Spjd} dmu_sync_arg_t; 1236168404Spjd 1237168404Spjd/* ARGSUSED */ 1238168404Spjdstatic void 1239185029Spjddmu_sync_ready(zio_t *zio, arc_buf_t *buf, void *varg) 1240185029Spjd{ 1241219089Spjd dmu_sync_arg_t *dsa = varg; 1242219089Spjd dmu_buf_t *db = dsa->dsa_zgd->zgd_db; 1243185029Spjd blkptr_t *bp = zio->io_bp; 1244185029Spjd 1245219089Spjd if (zio->io_error == 0) { 1246219089Spjd if (BP_IS_HOLE(bp)) { 1247219089Spjd /* 1248219089Spjd * A block of zeros may compress to a hole, but the 1249219089Spjd * block size still needs to be known for replay. 1250219089Spjd */ 1251219089Spjd BP_SET_LSIZE(bp, db->db_size); 1252219089Spjd } else { 1253219089Spjd ASSERT(BP_GET_LEVEL(bp) == 0); 1254219089Spjd bp->blk_fill = 1; 1255219089Spjd } 1256185029Spjd } 1257185029Spjd} 1258185029Spjd 1259219089Spjdstatic void 1260219089Spjddmu_sync_late_arrival_ready(zio_t *zio) 1261219089Spjd{ 1262219089Spjd dmu_sync_ready(zio, NULL, zio->io_private); 1263219089Spjd} 1264219089Spjd 1265185029Spjd/* ARGSUSED */ 1266185029Spjdstatic void 1267168404Spjddmu_sync_done(zio_t *zio, arc_buf_t *buf, void *varg) 1268168404Spjd{ 1269219089Spjd dmu_sync_arg_t *dsa = varg; 1270219089Spjd dbuf_dirty_record_t *dr = dsa->dsa_dr; 1271168404Spjd dmu_buf_impl_t *db = dr->dr_dbuf; 1272168404Spjd 1273168404Spjd mutex_enter(&db->db_mtx); 1274168404Spjd ASSERT(dr->dt.dl.dr_override_state == DR_IN_DMU_SYNC); 1275219089Spjd if (zio->io_error == 0) { 1276219089Spjd dr->dt.dl.dr_overridden_by = *zio->io_bp; 1277219089Spjd dr->dt.dl.dr_override_state = DR_OVERRIDDEN; 1278219089Spjd dr->dt.dl.dr_copies = zio->io_prop.zp_copies; 1279219089Spjd if (BP_IS_HOLE(&dr->dt.dl.dr_overridden_by)) 1280219089Spjd BP_ZERO(&dr->dt.dl.dr_overridden_by); 1281219089Spjd } else { 1282219089Spjd dr->dt.dl.dr_override_state = DR_NOT_OVERRIDDEN; 1283219089Spjd } 1284168404Spjd cv_broadcast(&db->db_changed); 1285168404Spjd mutex_exit(&db->db_mtx); 1286168404Spjd 1287219089Spjd dsa->dsa_done(dsa->dsa_zgd, zio->io_error); 1288168404Spjd 1289219089Spjd kmem_free(dsa, sizeof (*dsa)); 1290168404Spjd} 1291168404Spjd 1292219089Spjdstatic void 1293219089Spjddmu_sync_late_arrival_done(zio_t *zio) 1294219089Spjd{ 1295219089Spjd blkptr_t *bp = zio->io_bp; 1296219089Spjd dmu_sync_arg_t *dsa = zio->io_private; 1297219089Spjd 1298219089Spjd if (zio->io_error == 0 && !BP_IS_HOLE(bp)) { 1299219089Spjd ASSERT(zio->io_bp->blk_birth == zio->io_txg); 1300219089Spjd ASSERT(zio->io_txg > spa_syncing_txg(zio->io_spa)); 1301219089Spjd zio_free(zio->io_spa, zio->io_txg, zio->io_bp); 1302219089Spjd } 1303219089Spjd 1304219089Spjd dmu_tx_commit(dsa->dsa_tx); 1305219089Spjd 1306219089Spjd dsa->dsa_done(dsa->dsa_zgd, zio->io_error); 1307219089Spjd 1308219089Spjd kmem_free(dsa, sizeof (*dsa)); 1309219089Spjd} 1310219089Spjd 1311219089Spjdstatic int 1312219089Spjddmu_sync_late_arrival(zio_t *pio, objset_t *os, dmu_sync_cb_t *done, zgd_t *zgd, 1313219089Spjd zio_prop_t *zp, zbookmark_t *zb) 1314219089Spjd{ 1315219089Spjd dmu_sync_arg_t *dsa; 1316219089Spjd dmu_tx_t *tx; 1317219089Spjd 1318219089Spjd tx = dmu_tx_create(os); 1319219089Spjd dmu_tx_hold_space(tx, zgd->zgd_db->db_size); 1320219089Spjd if (dmu_tx_assign(tx, TXG_WAIT) != 0) { 1321219089Spjd dmu_tx_abort(tx); 1322219089Spjd return (EIO); /* Make zl_get_data do txg_waited_synced() */ 1323219089Spjd } 1324219089Spjd 1325219089Spjd dsa = kmem_alloc(sizeof (dmu_sync_arg_t), KM_SLEEP); 1326219089Spjd dsa->dsa_dr = NULL; 1327219089Spjd dsa->dsa_done = done; 1328219089Spjd dsa->dsa_zgd = zgd; 1329219089Spjd dsa->dsa_tx = tx; 1330219089Spjd 1331219089Spjd zio_nowait(zio_write(pio, os->os_spa, dmu_tx_get_txg(tx), zgd->zgd_bp, 1332219089Spjd zgd->zgd_db->db_data, zgd->zgd_db->db_size, zp, 1333219089Spjd dmu_sync_late_arrival_ready, dmu_sync_late_arrival_done, dsa, 1334219089Spjd ZIO_PRIORITY_SYNC_WRITE, ZIO_FLAG_CANFAIL, zb)); 1335219089Spjd 1336219089Spjd return (0); 1337219089Spjd} 1338219089Spjd 1339168404Spjd/* 1340168404Spjd * Intent log support: sync the block associated with db to disk. 1341168404Spjd * N.B. and XXX: the caller is responsible for making sure that the 1342168404Spjd * data isn't changing while dmu_sync() is writing it. 1343168404Spjd * 1344168404Spjd * Return values: 1345168404Spjd * 1346168404Spjd * EEXIST: this txg has already been synced, so there's nothing to to. 1347168404Spjd * The caller should not log the write. 1348168404Spjd * 1349168404Spjd * ENOENT: the block was dbuf_free_range()'d, so there's nothing to do. 1350168404Spjd * The caller should not log the write. 1351168404Spjd * 1352168404Spjd * EALREADY: this block is already in the process of being synced. 1353168404Spjd * The caller should track its progress (somehow). 1354168404Spjd * 1355219089Spjd * EIO: could not do the I/O. 1356219089Spjd * The caller should do a txg_wait_synced(). 1357168404Spjd * 1358219089Spjd * 0: the I/O has been initiated. 1359219089Spjd * The caller should log this blkptr in the done callback. 1360219089Spjd * It is possible that the I/O will fail, in which case 1361219089Spjd * the error will be reported to the done callback and 1362219089Spjd * propagated to pio from zio_done(). 1363168404Spjd */ 1364168404Spjdint 1365219089Spjddmu_sync(zio_t *pio, uint64_t txg, dmu_sync_cb_t *done, zgd_t *zgd) 1366168404Spjd{ 1367219089Spjd blkptr_t *bp = zgd->zgd_bp; 1368219089Spjd dmu_buf_impl_t *db = (dmu_buf_impl_t *)zgd->zgd_db; 1369219089Spjd objset_t *os = db->db_objset; 1370219089Spjd dsl_dataset_t *ds = os->os_dsl_dataset; 1371168404Spjd dbuf_dirty_record_t *dr; 1372219089Spjd dmu_sync_arg_t *dsa; 1373168404Spjd zbookmark_t zb; 1374219089Spjd zio_prop_t zp; 1375219089Spjd dnode_t *dn; 1376168404Spjd 1377219089Spjd ASSERT(pio != NULL); 1378168404Spjd ASSERT(BP_IS_HOLE(bp)); 1379168404Spjd ASSERT(txg != 0); 1380168404Spjd 1381219089Spjd SET_BOOKMARK(&zb, ds->ds_object, 1382219089Spjd db->db.db_object, db->db_level, db->db_blkid); 1383168404Spjd 1384219089Spjd DB_DNODE_ENTER(db); 1385219089Spjd dn = DB_DNODE(db); 1386219089Spjd dmu_write_policy(os, dn, db->db_level, WP_DMU_SYNC, &zp); 1387219089Spjd DB_DNODE_EXIT(db); 1388219089Spjd 1389168404Spjd /* 1390219089Spjd * If we're frozen (running ziltest), we always need to generate a bp. 1391168404Spjd */ 1392219089Spjd if (txg > spa_freeze_txg(os->os_spa)) 1393219089Spjd return (dmu_sync_late_arrival(pio, os, done, zgd, &zp, &zb)); 1394168404Spjd 1395168404Spjd /* 1396219089Spjd * Grabbing db_mtx now provides a barrier between dbuf_sync_leaf() 1397219089Spjd * and us. If we determine that this txg is not yet syncing, 1398219089Spjd * but it begins to sync a moment later, that's OK because the 1399219089Spjd * sync thread will block in dbuf_sync_leaf() until we drop db_mtx. 1400168404Spjd */ 1401219089Spjd mutex_enter(&db->db_mtx); 1402219089Spjd 1403219089Spjd if (txg <= spa_last_synced_txg(os->os_spa)) { 1404168404Spjd /* 1405219089Spjd * This txg has already synced. There's nothing to do. 1406168404Spjd */ 1407219089Spjd mutex_exit(&db->db_mtx); 1408168404Spjd return (EEXIST); 1409168404Spjd } 1410168404Spjd 1411219089Spjd if (txg <= spa_syncing_txg(os->os_spa)) { 1412219089Spjd /* 1413219089Spjd * This txg is currently syncing, so we can't mess with 1414219089Spjd * the dirty record anymore; just write a new log block. 1415219089Spjd */ 1416219089Spjd mutex_exit(&db->db_mtx); 1417219089Spjd return (dmu_sync_late_arrival(pio, os, done, zgd, &zp, &zb)); 1418168404Spjd } 1419168404Spjd 1420168404Spjd dr = db->db_last_dirty; 1421219089Spjd while (dr && dr->dr_txg != txg) 1422168404Spjd dr = dr->dr_next; 1423219089Spjd 1424219089Spjd if (dr == NULL) { 1425168404Spjd /* 1426219089Spjd * There's no dr for this dbuf, so it must have been freed. 1427168404Spjd * There's no need to log writes to freed blocks, so we're done. 1428168404Spjd */ 1429168404Spjd mutex_exit(&db->db_mtx); 1430168404Spjd return (ENOENT); 1431168404Spjd } 1432168404Spjd 1433168404Spjd ASSERT(dr->dr_txg == txg); 1434219089Spjd if (dr->dt.dl.dr_override_state == DR_IN_DMU_SYNC || 1435219089Spjd dr->dt.dl.dr_override_state == DR_OVERRIDDEN) { 1436168404Spjd /* 1437219089Spjd * We have already issued a sync write for this buffer, 1438219089Spjd * or this buffer has already been synced. It could not 1439219089Spjd * have been dirtied since, or we would have cleared the state. 1440168404Spjd */ 1441168404Spjd mutex_exit(&db->db_mtx); 1442168404Spjd return (EALREADY); 1443168404Spjd } 1444168404Spjd 1445219089Spjd ASSERT(dr->dt.dl.dr_override_state == DR_NOT_OVERRIDDEN); 1446168404Spjd dr->dt.dl.dr_override_state = DR_IN_DMU_SYNC; 1447168404Spjd mutex_exit(&db->db_mtx); 1448168404Spjd 1449219089Spjd dsa = kmem_alloc(sizeof (dmu_sync_arg_t), KM_SLEEP); 1450219089Spjd dsa->dsa_dr = dr; 1451219089Spjd dsa->dsa_done = done; 1452219089Spjd dsa->dsa_zgd = zgd; 1453219089Spjd dsa->dsa_tx = NULL; 1454168404Spjd 1455219089Spjd zio_nowait(arc_write(pio, os->os_spa, txg, 1456219089Spjd bp, dr->dt.dl.dr_data, DBUF_IS_L2CACHEABLE(db), &zp, 1457219089Spjd dmu_sync_ready, dmu_sync_done, dsa, 1458219089Spjd ZIO_PRIORITY_SYNC_WRITE, ZIO_FLAG_CANFAIL, &zb)); 1459185029Spjd 1460219089Spjd return (0); 1461168404Spjd} 1462168404Spjd 1463168404Spjdint 1464168404Spjddmu_object_set_blocksize(objset_t *os, uint64_t object, uint64_t size, int ibs, 1465168404Spjd dmu_tx_t *tx) 1466168404Spjd{ 1467168404Spjd dnode_t *dn; 1468168404Spjd int err; 1469168404Spjd 1470219089Spjd err = dnode_hold(os, object, FTAG, &dn); 1471168404Spjd if (err) 1472168404Spjd return (err); 1473168404Spjd err = dnode_set_blksz(dn, size, ibs, tx); 1474168404Spjd dnode_rele(dn, FTAG); 1475168404Spjd return (err); 1476168404Spjd} 1477168404Spjd 1478168404Spjdvoid 1479168404Spjddmu_object_set_checksum(objset_t *os, uint64_t object, uint8_t checksum, 1480168404Spjd dmu_tx_t *tx) 1481168404Spjd{ 1482168404Spjd dnode_t *dn; 1483168404Spjd 1484168404Spjd /* XXX assumes dnode_hold will not get an i/o error */ 1485219089Spjd (void) dnode_hold(os, object, FTAG, &dn); 1486168404Spjd ASSERT(checksum < ZIO_CHECKSUM_FUNCTIONS); 1487168404Spjd dn->dn_checksum = checksum; 1488168404Spjd dnode_setdirty(dn, tx); 1489168404Spjd dnode_rele(dn, FTAG); 1490168404Spjd} 1491168404Spjd 1492168404Spjdvoid 1493168404Spjddmu_object_set_compress(objset_t *os, uint64_t object, uint8_t compress, 1494168404Spjd dmu_tx_t *tx) 1495168404Spjd{ 1496168404Spjd dnode_t *dn; 1497168404Spjd 1498168404Spjd /* XXX assumes dnode_hold will not get an i/o error */ 1499219089Spjd (void) dnode_hold(os, object, FTAG, &dn); 1500168404Spjd ASSERT(compress < ZIO_COMPRESS_FUNCTIONS); 1501168404Spjd dn->dn_compress = compress; 1502168404Spjd dnode_setdirty(dn, tx); 1503168404Spjd dnode_rele(dn, FTAG); 1504168404Spjd} 1505168404Spjd 1506219089Spjdint zfs_mdcomp_disable = 0; 1507219089SpjdTUNABLE_INT("vfs.zfs.mdcomp_disable", &zfs_mdcomp_disable); 1508219089SpjdSYSCTL_DECL(_vfs_zfs); 1509219089SpjdSYSCTL_INT(_vfs_zfs, OID_AUTO, mdcomp_disable, CTLFLAG_RW, 1510219089Spjd &zfs_mdcomp_disable, 0, "Disable metadata compression"); 1511219089Spjd 1512219089Spjdvoid 1513219089Spjddmu_write_policy(objset_t *os, dnode_t *dn, int level, int wp, zio_prop_t *zp) 1514219089Spjd{ 1515219089Spjd dmu_object_type_t type = dn ? dn->dn_type : DMU_OT_OBJSET; 1516219089Spjd boolean_t ismd = (level > 0 || dmu_ot[type].ot_metadata || 1517219089Spjd (wp & WP_SPILL)); 1518219089Spjd enum zio_checksum checksum = os->os_checksum; 1519219089Spjd enum zio_compress compress = os->os_compress; 1520219089Spjd enum zio_checksum dedup_checksum = os->os_dedup_checksum; 1521219089Spjd boolean_t dedup; 1522219089Spjd boolean_t dedup_verify = os->os_dedup_verify; 1523219089Spjd int copies = os->os_copies; 1524219089Spjd 1525219089Spjd /* 1526219089Spjd * Determine checksum setting. 1527219089Spjd */ 1528219089Spjd if (ismd) { 1529219089Spjd /* 1530219089Spjd * Metadata always gets checksummed. If the data 1531219089Spjd * checksum is multi-bit correctable, and it's not a 1532219089Spjd * ZBT-style checksum, then it's suitable for metadata 1533219089Spjd * as well. Otherwise, the metadata checksum defaults 1534219089Spjd * to fletcher4. 1535219089Spjd */ 1536219089Spjd if (zio_checksum_table[checksum].ci_correctable < 1 || 1537219089Spjd zio_checksum_table[checksum].ci_eck) 1538219089Spjd checksum = ZIO_CHECKSUM_FLETCHER_4; 1539219089Spjd } else { 1540219089Spjd checksum = zio_checksum_select(dn->dn_checksum, checksum); 1541219089Spjd } 1542219089Spjd 1543219089Spjd /* 1544219089Spjd * Determine compression setting. 1545219089Spjd */ 1546219089Spjd if (ismd) { 1547219089Spjd /* 1548219089Spjd * XXX -- we should design a compression algorithm 1549219089Spjd * that specializes in arrays of bps. 1550219089Spjd */ 1551219089Spjd compress = zfs_mdcomp_disable ? ZIO_COMPRESS_EMPTY : 1552219089Spjd ZIO_COMPRESS_LZJB; 1553219089Spjd } else { 1554219089Spjd compress = zio_compress_select(dn->dn_compress, compress); 1555219089Spjd } 1556219089Spjd 1557219089Spjd /* 1558219089Spjd * Determine dedup setting. If we are in dmu_sync(), we won't 1559219089Spjd * actually dedup now because that's all done in syncing context; 1560219089Spjd * but we do want to use the dedup checkum. If the checksum is not 1561219089Spjd * strong enough to ensure unique signatures, force dedup_verify. 1562219089Spjd */ 1563219089Spjd dedup = (!ismd && dedup_checksum != ZIO_CHECKSUM_OFF); 1564219089Spjd if (dedup) { 1565219089Spjd checksum = dedup_checksum; 1566219089Spjd if (!zio_checksum_table[checksum].ci_dedup) 1567219089Spjd dedup_verify = 1; 1568219089Spjd } 1569219089Spjd 1570219089Spjd if (wp & WP_DMU_SYNC) 1571219089Spjd dedup = 0; 1572219089Spjd 1573219089Spjd if (wp & WP_NOFILL) { 1574219089Spjd ASSERT(!ismd && level == 0); 1575219089Spjd checksum = ZIO_CHECKSUM_OFF; 1576219089Spjd compress = ZIO_COMPRESS_OFF; 1577219089Spjd dedup = B_FALSE; 1578219089Spjd } 1579219089Spjd 1580219089Spjd zp->zp_checksum = checksum; 1581219089Spjd zp->zp_compress = compress; 1582219089Spjd zp->zp_type = (wp & WP_SPILL) ? dn->dn_bonustype : type; 1583219089Spjd zp->zp_level = level; 1584219089Spjd zp->zp_copies = MIN(copies + ismd, spa_max_replication(os->os_spa)); 1585219089Spjd zp->zp_dedup = dedup; 1586219089Spjd zp->zp_dedup_verify = dedup && dedup_verify; 1587219089Spjd} 1588219089Spjd 1589168404Spjdint 1590168404Spjddmu_offset_next(objset_t *os, uint64_t object, boolean_t hole, uint64_t *off) 1591168404Spjd{ 1592168404Spjd dnode_t *dn; 1593168404Spjd int i, err; 1594168404Spjd 1595219089Spjd err = dnode_hold(os, object, FTAG, &dn); 1596168404Spjd if (err) 1597168404Spjd return (err); 1598168404Spjd /* 1599168404Spjd * Sync any current changes before 1600168404Spjd * we go trundling through the block pointers. 1601168404Spjd */ 1602168404Spjd for (i = 0; i < TXG_SIZE; i++) { 1603168404Spjd if (list_link_active(&dn->dn_dirty_link[i])) 1604168404Spjd break; 1605168404Spjd } 1606168404Spjd if (i != TXG_SIZE) { 1607168404Spjd dnode_rele(dn, FTAG); 1608168404Spjd txg_wait_synced(dmu_objset_pool(os), 0); 1609219089Spjd err = dnode_hold(os, object, FTAG, &dn); 1610168404Spjd if (err) 1611168404Spjd return (err); 1612168404Spjd } 1613168404Spjd 1614185029Spjd err = dnode_next_offset(dn, (hole ? DNODE_FIND_HOLE : 0), off, 1, 1, 0); 1615168404Spjd dnode_rele(dn, FTAG); 1616168404Spjd 1617168404Spjd return (err); 1618168404Spjd} 1619168404Spjd 1620168404Spjdvoid 1621168404Spjddmu_object_info_from_dnode(dnode_t *dn, dmu_object_info_t *doi) 1622168404Spjd{ 1623219089Spjd dnode_phys_t *dnp; 1624219089Spjd 1625168404Spjd rw_enter(&dn->dn_struct_rwlock, RW_READER); 1626168404Spjd mutex_enter(&dn->dn_mtx); 1627168404Spjd 1628219089Spjd dnp = dn->dn_phys; 1629219089Spjd 1630168404Spjd doi->doi_data_block_size = dn->dn_datablksz; 1631168404Spjd doi->doi_metadata_block_size = dn->dn_indblkshift ? 1632168404Spjd 1ULL << dn->dn_indblkshift : 0; 1633219089Spjd doi->doi_type = dn->dn_type; 1634219089Spjd doi->doi_bonus_type = dn->dn_bonustype; 1635219089Spjd doi->doi_bonus_size = dn->dn_bonuslen; 1636168404Spjd doi->doi_indirection = dn->dn_nlevels; 1637168404Spjd doi->doi_checksum = dn->dn_checksum; 1638168404Spjd doi->doi_compress = dn->dn_compress; 1639219089Spjd doi->doi_physical_blocks_512 = (DN_USED_BYTES(dnp) + 256) >> 9; 1640219089Spjd doi->doi_max_offset = (dnp->dn_maxblkid + 1) * dn->dn_datablksz; 1641219089Spjd doi->doi_fill_count = 0; 1642219089Spjd for (int i = 0; i < dnp->dn_nblkptr; i++) 1643219089Spjd doi->doi_fill_count += dnp->dn_blkptr[i].blk_fill; 1644168404Spjd 1645168404Spjd mutex_exit(&dn->dn_mtx); 1646168404Spjd rw_exit(&dn->dn_struct_rwlock); 1647168404Spjd} 1648168404Spjd 1649168404Spjd/* 1650168404Spjd * Get information on a DMU object. 1651168404Spjd * If doi is NULL, just indicates whether the object exists. 1652168404Spjd */ 1653168404Spjdint 1654168404Spjddmu_object_info(objset_t *os, uint64_t object, dmu_object_info_t *doi) 1655168404Spjd{ 1656168404Spjd dnode_t *dn; 1657219089Spjd int err = dnode_hold(os, object, FTAG, &dn); 1658168404Spjd 1659168404Spjd if (err) 1660168404Spjd return (err); 1661168404Spjd 1662168404Spjd if (doi != NULL) 1663168404Spjd dmu_object_info_from_dnode(dn, doi); 1664168404Spjd 1665168404Spjd dnode_rele(dn, FTAG); 1666168404Spjd return (0); 1667168404Spjd} 1668168404Spjd 1669168404Spjd/* 1670168404Spjd * As above, but faster; can be used when you have a held dbuf in hand. 1671168404Spjd */ 1672168404Spjdvoid 1673219089Spjddmu_object_info_from_db(dmu_buf_t *db_fake, dmu_object_info_t *doi) 1674168404Spjd{ 1675219089Spjd dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 1676219089Spjd 1677219089Spjd DB_DNODE_ENTER(db); 1678219089Spjd dmu_object_info_from_dnode(DB_DNODE(db), doi); 1679219089Spjd DB_DNODE_EXIT(db); 1680168404Spjd} 1681168404Spjd 1682168404Spjd/* 1683168404Spjd * Faster still when you only care about the size. 1684168404Spjd * This is specifically optimized for zfs_getattr(). 1685168404Spjd */ 1686168404Spjdvoid 1687219089Spjddmu_object_size_from_db(dmu_buf_t *db_fake, uint32_t *blksize, 1688219089Spjd u_longlong_t *nblk512) 1689168404Spjd{ 1690219089Spjd dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake; 1691219089Spjd dnode_t *dn; 1692168404Spjd 1693219089Spjd DB_DNODE_ENTER(db); 1694219089Spjd dn = DB_DNODE(db); 1695219089Spjd 1696168404Spjd *blksize = dn->dn_datablksz; 1697168404Spjd /* add 1 for dnode space */ 1698168404Spjd *nblk512 = ((DN_USED_BYTES(dn->dn_phys) + SPA_MINBLOCKSIZE/2) >> 1699168404Spjd SPA_MINBLOCKSHIFT) + 1; 1700219089Spjd DB_DNODE_EXIT(db); 1701168404Spjd} 1702168404Spjd 1703168404Spjdvoid 1704168404Spjdbyteswap_uint64_array(void *vbuf, size_t size) 1705168404Spjd{ 1706168404Spjd uint64_t *buf = vbuf; 1707168404Spjd size_t count = size >> 3; 1708168404Spjd int i; 1709168404Spjd 1710168404Spjd ASSERT((size & 7) == 0); 1711168404Spjd 1712168404Spjd for (i = 0; i < count; i++) 1713168404Spjd buf[i] = BSWAP_64(buf[i]); 1714168404Spjd} 1715168404Spjd 1716168404Spjdvoid 1717168404Spjdbyteswap_uint32_array(void *vbuf, size_t size) 1718168404Spjd{ 1719168404Spjd uint32_t *buf = vbuf; 1720168404Spjd size_t count = size >> 2; 1721168404Spjd int i; 1722168404Spjd 1723168404Spjd ASSERT((size & 3) == 0); 1724168404Spjd 1725168404Spjd for (i = 0; i < count; i++) 1726168404Spjd buf[i] = BSWAP_32(buf[i]); 1727168404Spjd} 1728168404Spjd 1729168404Spjdvoid 1730168404Spjdbyteswap_uint16_array(void *vbuf, size_t size) 1731168404Spjd{ 1732168404Spjd uint16_t *buf = vbuf; 1733168404Spjd size_t count = size >> 1; 1734168404Spjd int i; 1735168404Spjd 1736168404Spjd ASSERT((size & 1) == 0); 1737168404Spjd 1738168404Spjd for (i = 0; i < count; i++) 1739168404Spjd buf[i] = BSWAP_16(buf[i]); 1740168404Spjd} 1741168404Spjd 1742168404Spjd/* ARGSUSED */ 1743168404Spjdvoid 1744168404Spjdbyteswap_uint8_array(void *vbuf, size_t size) 1745168404Spjd{ 1746168404Spjd} 1747168404Spjd 1748168404Spjdvoid 1749168404Spjddmu_init(void) 1750168404Spjd{ 1751219089Spjd zfs_dbgmsg_init(); 1752219089Spjd sa_cache_init(); 1753219089Spjd xuio_stat_init(); 1754219089Spjd dmu_objset_init(); 1755219089Spjd dnode_init(); 1756168404Spjd dbuf_init(); 1757208130Smm zfetch_init(); 1758168404Spjd arc_init(); 1759185029Spjd l2arc_init(); 1760168404Spjd} 1761168404Spjd 1762168404Spjdvoid 1763168404Spjddmu_fini(void) 1764168404Spjd{ 1765219089Spjd l2arc_fini(); 1766168404Spjd arc_fini(); 1767208130Smm zfetch_fini(); 1768219089Spjd dbuf_fini(); 1769168404Spjd dnode_fini(); 1770219089Spjd dmu_objset_fini(); 1771219089Spjd xuio_stat_fini(); 1772219089Spjd sa_cache_fini(); 1773219089Spjd zfs_dbgmsg_fini(); 1774168404Spjd} 1775