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 */ 24 25 #include <sys/dmu.h> 26 #include <sys/dmu_objset.h> 27 #include <sys/dmu_tx.h> 28 #include <sys/dnode.h> 29 30 uint64_t 31 dmu_object_alloc(objset_t *os, dmu_object_type_t ot, int blocksize, 32 dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx) 33 { 34 uint64_t object; 35 uint64_t L2_dnode_count = DNODES_PER_BLOCK << 36 (DMU_META_DNODE(os)->dn_indblkshift - SPA_BLKPTRSHIFT); 37 dnode_t *dn = NULL; 38 int restarted = B_FALSE; 39 40 mutex_enter(&os->os_obj_lock); 41 for (;;) { 42 object = os->os_obj_next; 43 /* 44 * Each time we polish off an L2 bp worth of dnodes 45 * (2^13 objects), move to another L2 bp that's still 46 * reasonably sparse (at most 1/4 full). Look from the 47 * beginning once, but after that keep looking from here. 48 * If we can't find one, just keep going from here. 49 */ 50 if (P2PHASE(object, L2_dnode_count) == 0) { 51 uint64_t offset = restarted ? object << DNODE_SHIFT : 0; 52 int error = dnode_next_offset(DMU_META_DNODE(os), 53 DNODE_FIND_HOLE, 54 &offset, 2, DNODES_PER_BLOCK >> 2, 0); 55 restarted = B_TRUE; 56 if (error == 0) 57 object = offset >> DNODE_SHIFT; 58 } 59 os->os_obj_next = ++object; 60 61 /* 62 * XXX We should check for an i/o error here and return 63 * up to our caller. Actually we should pre-read it in 64 * dmu_tx_assign(), but there is currently no mechanism 65 * to do so. 66 */ 67 (void) dnode_hold_impl(os, object, DNODE_MUST_BE_FREE, 68 FTAG, &dn); 69 if (dn) 70 break; 71 72 if (dmu_object_next(os, &object, B_TRUE, 0) == 0) 73 os->os_obj_next = object - 1; 74 } 75 76 dnode_allocate(dn, ot, blocksize, 0, bonustype, bonuslen, tx); 77 dnode_rele(dn, FTAG); 78 79 mutex_exit(&os->os_obj_lock); 80 81 dmu_tx_add_new_object(tx, os, object); 82 return (object); 83 } 84 85 int 86 dmu_object_claim(objset_t *os, uint64_t object, dmu_object_type_t ot, 87 int blocksize, dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx) 88 { 89 dnode_t *dn; 90 int err; 91 92 if (object == DMU_META_DNODE_OBJECT && !dmu_tx_private_ok(tx)) 93 return (EBADF); 94 95 err = dnode_hold_impl(os, object, DNODE_MUST_BE_FREE, FTAG, &dn); 96 if (err) 97 return (err); 98 dnode_allocate(dn, ot, blocksize, 0, bonustype, bonuslen, tx); 99 dnode_rele(dn, FTAG); 100 101 dmu_tx_add_new_object(tx, os, object); 102 return (0); 103 } 104 105 int 106 dmu_object_reclaim(objset_t *os, uint64_t object, dmu_object_type_t ot, 107 int blocksize, dmu_object_type_t bonustype, int bonuslen) 108 { 109 dnode_t *dn; 110 dmu_tx_t *tx; 111 int nblkptr; 112 int err; 113 114 if (object == DMU_META_DNODE_OBJECT) 115 return (EBADF); 116 117 err = dnode_hold_impl(os, object, DNODE_MUST_BE_ALLOCATED, 118 FTAG, &dn); 119 if (err) 120 return (err); 121 122 if (dn->dn_type == ot && dn->dn_datablksz == blocksize && 123 dn->dn_bonustype == bonustype && dn->dn_bonuslen == bonuslen) { 124 /* nothing is changing, this is a noop */ 125 dnode_rele(dn, FTAG); 126 return (0); 127 } 128 129 if (bonustype == DMU_OT_SA) { 130 nblkptr = 1; 131 } else { 132 nblkptr = 1 + ((DN_MAX_BONUSLEN - bonuslen) >> SPA_BLKPTRSHIFT); 133 } 134 135 /* 136 * If we are losing blkptrs or changing the block size this must 137 * be a new file instance. We must clear out the previous file 138 * contents before we can change this type of metadata in the dnode. 139 */ 140 if (dn->dn_nblkptr > nblkptr || dn->dn_datablksz != blocksize) { 141 err = dmu_free_long_range(os, object, 0, DMU_OBJECT_END); 142 if (err) 143 goto out; 144 } 145 146 tx = dmu_tx_create(os); 147 dmu_tx_hold_bonus(tx, object); 148 err = dmu_tx_assign(tx, TXG_WAIT); 149 if (err) { 150 dmu_tx_abort(tx); 151 goto out; 152 } 153 154 dnode_reallocate(dn, ot, blocksize, bonustype, bonuslen, tx); 155 156 dmu_tx_commit(tx); 157 out: 158 dnode_rele(dn, FTAG); 159 160 return (err); 161 } 162 163 int 164 dmu_object_free(objset_t *os, uint64_t object, dmu_tx_t *tx) 165 { 166 dnode_t *dn; 167 int err; 168 169 ASSERT(object != DMU_META_DNODE_OBJECT || dmu_tx_private_ok(tx)); 170 171 err = dnode_hold_impl(os, object, DNODE_MUST_BE_ALLOCATED, 172 FTAG, &dn); 173 if (err) 174 return (err); 175 176 ASSERT(dn->dn_type != DMU_OT_NONE); 177 dnode_free_range(dn, 0, DMU_OBJECT_END, tx); 178 dnode_free(dn, tx); 179 dnode_rele(dn, FTAG); 180 181 return (0); 182 } 183 184 int 185 dmu_object_next(objset_t *os, uint64_t *objectp, boolean_t hole, uint64_t txg) 186 { 187 uint64_t offset = (*objectp + 1) << DNODE_SHIFT; 188 int error; 189 190 error = dnode_next_offset(DMU_META_DNODE(os), 191 (hole ? DNODE_FIND_HOLE : 0), &offset, 0, DNODES_PER_BLOCK, txg); 192 193 *objectp = offset >> DNODE_SHIFT; 194 195 return (error); 196 } 197