1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 23 * Copyright (c) 2013, 2015 by Delphix. All rights reserved. 24 * Copyright 2014 HybridCluster. All rights reserved. 25 */ 26 27 #include <sys/dmu.h> 28 #include <sys/dmu_objset.h> 29 #include <sys/dmu_tx.h> 30 #include <sys/dnode.h> 31 #include <sys/zap.h> 32 #include <sys/zfeature.h> 33 34 uint64_t 35 dmu_object_alloc(objset_t *os, dmu_object_type_t ot, int blocksize, 36 dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx) 37 { 38 uint64_t object; 39 uint64_t L2_dnode_count = DNODES_PER_BLOCK << 40 (DMU_META_DNODE(os)->dn_indblkshift - SPA_BLKPTRSHIFT); 41 dnode_t *dn = NULL; 42 int restarted = B_FALSE; 43 44 mutex_enter(&os->os_obj_lock); 45 for (;;) { 46 object = os->os_obj_next; 47 /* 48 * Each time we polish off an L2 bp worth of dnodes 49 * (2^13 objects), move to another L2 bp that's still 50 * reasonably sparse (at most 1/4 full). Look from the 51 * beginning once, but after that keep looking from here. 52 * If we can't find one, just keep going from here. 53 * 54 * Note that dmu_traverse depends on the behavior that we use 55 * multiple blocks of the dnode object before going back to 56 * reuse objects. Any change to this algorithm should preserve 57 * that property or find another solution to the issues 58 * described in traverse_visitbp. 59 */ 60 if (P2PHASE(object, L2_dnode_count) == 0) { 61 uint64_t offset = restarted ? object << DNODE_SHIFT : 0; 62 int error = dnode_next_offset(DMU_META_DNODE(os), 63 DNODE_FIND_HOLE, 64 &offset, 2, DNODES_PER_BLOCK >> 2, 0); 65 restarted = B_TRUE; 66 if (error == 0) 67 object = offset >> DNODE_SHIFT; 68 } 69 os->os_obj_next = ++object; 70 71 /* 72 * XXX We should check for an i/o error here and return 73 * up to our caller. Actually we should pre-read it in 74 * dmu_tx_assign(), but there is currently no mechanism 75 * to do so. 76 */ 77 (void) dnode_hold_impl(os, object, DNODE_MUST_BE_FREE, 78 FTAG, &dn); 79 if (dn) 80 break; 81 82 if (dmu_object_next(os, &object, B_TRUE, 0) == 0) 83 os->os_obj_next = object - 1; 84 } 85 86 dnode_allocate(dn, ot, blocksize, 0, bonustype, bonuslen, tx); 87 dnode_rele(dn, FTAG); 88 89 mutex_exit(&os->os_obj_lock); 90 91 dmu_tx_add_new_object(tx, os, object); 92 return (object); 93 } 94 95 int 96 dmu_object_claim(objset_t *os, uint64_t object, dmu_object_type_t ot, 97 int blocksize, dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx) 98 { 99 dnode_t *dn; 100 int err; 101 102 if (object == DMU_META_DNODE_OBJECT && !dmu_tx_private_ok(tx)) 103 return (SET_ERROR(EBADF)); 104 105 err = dnode_hold_impl(os, object, DNODE_MUST_BE_FREE, FTAG, &dn); 106 if (err) 107 return (err); 108 dnode_allocate(dn, ot, blocksize, 0, bonustype, bonuslen, tx); 109 dnode_rele(dn, FTAG); 110 111 dmu_tx_add_new_object(tx, os, object); 112 return (0); 113 } 114 115 int 116 dmu_object_reclaim(objset_t *os, uint64_t object, dmu_object_type_t ot, 117 int blocksize, dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx) 118 { 119 dnode_t *dn; 120 int err; 121 122 if (object == DMU_META_DNODE_OBJECT) 123 return (SET_ERROR(EBADF)); 124 125 err = dnode_hold_impl(os, object, DNODE_MUST_BE_ALLOCATED, 126 FTAG, &dn); 127 if (err) 128 return (err); 129 130 dnode_reallocate(dn, ot, blocksize, bonustype, bonuslen, tx); 131 132 dnode_rele(dn, FTAG); 133 return (err); 134 } 135 136 int 137 dmu_object_free(objset_t *os, uint64_t object, dmu_tx_t *tx) 138 { 139 dnode_t *dn; 140 int err; 141 142 ASSERT(object != DMU_META_DNODE_OBJECT || dmu_tx_private_ok(tx)); 143 144 err = dnode_hold_impl(os, object, DNODE_MUST_BE_ALLOCATED, 145 FTAG, &dn); 146 if (err) 147 return (err); 148 149 ASSERT(dn->dn_type != DMU_OT_NONE); 150 dnode_free_range(dn, 0, DMU_OBJECT_END, tx); 151 dnode_free(dn, tx); 152 dnode_rele(dn, FTAG); 153 154 return (0); 155 } 156 157 /* 158 * Return (in *objectp) the next object which is allocated (or a hole) 159 * after *object, taking into account only objects that may have been modified 160 * after the specified txg. 161 */ 162 int 163 dmu_object_next(objset_t *os, uint64_t *objectp, boolean_t hole, uint64_t txg) 164 { 165 uint64_t offset = (*objectp + 1) << DNODE_SHIFT; 166 int error; 167 168 error = dnode_next_offset(DMU_META_DNODE(os), 169 (hole ? DNODE_FIND_HOLE : 0), &offset, 0, DNODES_PER_BLOCK, txg); 170 171 *objectp = offset >> DNODE_SHIFT; 172 173 return (error); 174 } 175 176 /* 177 * Turn this object from old_type into DMU_OTN_ZAP_METADATA, and bump the 178 * refcount on SPA_FEATURE_EXTENSIBLE_DATASET. 179 * 180 * Only for use from syncing context, on MOS objects. 181 */ 182 void 183 dmu_object_zapify(objset_t *mos, uint64_t object, dmu_object_type_t old_type, 184 dmu_tx_t *tx) 185 { 186 dnode_t *dn; 187 188 ASSERT(dmu_tx_is_syncing(tx)); 189 190 VERIFY0(dnode_hold(mos, object, FTAG, &dn)); 191 if (dn->dn_type == DMU_OTN_ZAP_METADATA) { 192 dnode_rele(dn, FTAG); 193 return; 194 } 195 ASSERT3U(dn->dn_type, ==, old_type); 196 ASSERT0(dn->dn_maxblkid); 197 dn->dn_next_type[tx->tx_txg & TXG_MASK] = dn->dn_type = 198 DMU_OTN_ZAP_METADATA; 199 dnode_setdirty(dn, tx); 200 dnode_rele(dn, FTAG); 201 202 mzap_create_impl(mos, object, 0, 0, tx); 203 204 spa_feature_incr(dmu_objset_spa(mos), 205 SPA_FEATURE_EXTENSIBLE_DATASET, tx); 206 } 207 208 void 209 dmu_object_free_zapified(objset_t *mos, uint64_t object, dmu_tx_t *tx) 210 { 211 dnode_t *dn; 212 dmu_object_type_t t; 213 214 ASSERT(dmu_tx_is_syncing(tx)); 215 216 VERIFY0(dnode_hold(mos, object, FTAG, &dn)); 217 t = dn->dn_type; 218 dnode_rele(dn, FTAG); 219 220 if (t == DMU_OTN_ZAP_METADATA) { 221 spa_feature_decr(dmu_objset_spa(mos), 222 SPA_FEATURE_EXTENSIBLE_DATASET, tx); 223 } 224 VERIFY0(dmu_object_free(mos, object, tx)); 225 } 226
Indexes created Tue May 26 00:24:38 UTC 2026