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, 2014 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 if (P2PHASE(object, L2_dnode_count) == 0) { 55 uint64_t offset = restarted ? object << DNODE_SHIFT : 0; 56 int error = dnode_next_offset(DMU_META_DNODE(os), 57 DNODE_FIND_HOLE, 58 &offset, 2, DNODES_PER_BLOCK >> 2, 0); 59 restarted = B_TRUE; 60 if (error == 0) 61 object = offset >> DNODE_SHIFT; 62 } 63 os->os_obj_next = ++object; 64 65 /* 66 * XXX We should check for an i/o error here and return 67 * up to our caller. Actually we should pre-read it in 68 * dmu_tx_assign(), but there is currently no mechanism 69 * to do so. 70 */ 71 (void) dnode_hold_impl(os, object, DNODE_MUST_BE_FREE, 72 FTAG, &dn); 73 if (dn) 74 break; 75 76 if (dmu_object_next(os, &object, B_TRUE, 0) == 0) 77 os->os_obj_next = object - 1; 78 } 79 80 dnode_allocate(dn, ot, blocksize, 0, bonustype, bonuslen, tx); 81 dnode_rele(dn, FTAG); 82 83 mutex_exit(&os->os_obj_lock); 84 85 dmu_tx_add_new_object(tx, os, object); 86 return (object); 87 } 88 89 int 90 dmu_object_claim(objset_t *os, uint64_t object, dmu_object_type_t ot, 91 int blocksize, dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx) 92 { 93 dnode_t *dn; 94 int err; 95 96 if (object == DMU_META_DNODE_OBJECT && !dmu_tx_private_ok(tx)) 97 return (SET_ERROR(EBADF)); 98 99 err = dnode_hold_impl(os, object, DNODE_MUST_BE_FREE, FTAG, &dn); 100 if (err) 101 return (err); 102 dnode_allocate(dn, ot, blocksize, 0, bonustype, bonuslen, tx); 103 dnode_rele(dn, FTAG); 104 105 dmu_tx_add_new_object(tx, os, object); 106 return (0); 107 } 108 109 int 110 dmu_object_reclaim(objset_t *os, uint64_t object, dmu_object_type_t ot, 111 int blocksize, dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx) 112 { 113 dnode_t *dn; 114 int err; 115 116 if (object == DMU_META_DNODE_OBJECT) 117 return (SET_ERROR(EBADF)); 118 119 err = dnode_hold_impl(os, object, DNODE_MUST_BE_ALLOCATED, 120 FTAG, &dn); 121 if (err) 122 return (err); 123 124 dnode_reallocate(dn, ot, blocksize, bonustype, bonuslen, tx); 125 126 dnode_rele(dn, FTAG); 127 return (err); 128 } 129 130 int 131 dmu_object_free(objset_t *os, uint64_t object, dmu_tx_t *tx) 132 { 133 dnode_t *dn; 134 int err; 135 136 ASSERT(object != DMU_META_DNODE_OBJECT || dmu_tx_private_ok(tx)); 137 138 err = dnode_hold_impl(os, object, DNODE_MUST_BE_ALLOCATED, 139 FTAG, &dn); 140 if (err) 141 return (err); 142 143 ASSERT(dn->dn_type != DMU_OT_NONE); 144 dnode_free_range(dn, 0, DMU_OBJECT_END, tx); 145 dnode_free(dn, tx); 146 dnode_rele(dn, FTAG); 147 148 return (0); 149 } 150 151 /* 152 * Return (in *objectp) the next object which is allocated (or a hole) 153 * after *object, taking into account only objects that may have been modified 154 * after the specified txg. 155 */ 156 int 157 dmu_object_next(objset_t *os, uint64_t *objectp, boolean_t hole, uint64_t txg) 158 { 159 uint64_t offset = (*objectp + 1) << DNODE_SHIFT; 160 int error; 161 162 error = dnode_next_offset(DMU_META_DNODE(os), 163 (hole ? DNODE_FIND_HOLE : 0), &offset, 0, DNODES_PER_BLOCK, txg); 164 165 *objectp = offset >> DNODE_SHIFT; 166 167 return (error); 168 } 169 170 /* 171 * Turn this object from old_type into DMU_OTN_ZAP_METADATA, and bump the 172 * refcount on SPA_FEATURE_EXTENSIBLE_DATASET. 173 * 174 * Only for use from syncing context, on MOS objects. 175 */ 176 void 177 dmu_object_zapify(objset_t *mos, uint64_t object, dmu_object_type_t old_type, 178 dmu_tx_t *tx) 179 { 180 dnode_t *dn; 181 182 ASSERT(dmu_tx_is_syncing(tx)); 183 184 VERIFY0(dnode_hold(mos, object, FTAG, &dn)); 185 if (dn->dn_type == DMU_OTN_ZAP_METADATA) { 186 dnode_rele(dn, FTAG); 187 return; 188 } 189 ASSERT3U(dn->dn_type, ==, old_type); 190 ASSERT0(dn->dn_maxblkid); 191 dn->dn_next_type[tx->tx_txg & TXG_MASK] = dn->dn_type = 192 DMU_OTN_ZAP_METADATA; 193 dnode_setdirty(dn, tx); 194 dnode_rele(dn, FTAG); 195 196 mzap_create_impl(mos, object, 0, 0, tx); 197 198 spa_feature_incr(dmu_objset_spa(mos), 199 SPA_FEATURE_EXTENSIBLE_DATASET, tx); 200 } 201 202 void 203 dmu_object_free_zapified(objset_t *mos, uint64_t object, dmu_tx_t *tx) 204 { 205 dnode_t *dn; 206 dmu_object_type_t t; 207 208 ASSERT(dmu_tx_is_syncing(tx)); 209 210 VERIFY0(dnode_hold(mos, object, FTAG, &dn)); 211 t = dn->dn_type; 212 dnode_rele(dn, FTAG); 213 214 if (t == DMU_OTN_ZAP_METADATA) { 215 spa_feature_decr(dmu_objset_spa(mos), 216 SPA_FEATURE_EXTENSIBLE_DATASET, tx); 217 } 218 VERIFY0(dmu_object_free(mos, object, tx)); 219 } 220