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 2006 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #pragma ident "%Z%%M% %I% %E% SMI" 27 28 #include <sys/dmu.h> 29 #include <sys/dmu_objset.h> 30 #include <sys/dmu_tx.h> 31 #include <sys/dnode.h> 32 33 uint64_t 34 dmu_object_alloc(objset_t *os, dmu_object_type_t ot, int blocksize, 35 dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx) 36 { 37 objset_impl_t *osi = os->os; 38 uint64_t object; 39 uint64_t L2_dnode_count = DNODES_PER_BLOCK << 40 (osi->os_meta_dnode->dn_indblkshift - SPA_BLKPTRSHIFT); 41 dnode_t *dn = NULL; 42 int restarted = B_FALSE; 43 44 mutex_enter(&osi->os_obj_lock); 45 for (;;) { 46 object = osi->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(osi->os_meta_dnode, 57 B_TRUE, &offset, 2, DNODES_PER_BLOCK >> 2); 58 restarted = B_TRUE; 59 if (error == 0) 60 object = offset >> DNODE_SHIFT; 61 } 62 osi->os_obj_next = ++object; 63 64 /* 65 * XXX We should check for an i/o error here and return 66 * up to our caller. Actually we should pre-read it in 67 * dmu_tx_assign(), but there is currently no mechanism 68 * to do so. 69 */ 70 (void) dnode_hold_impl(os->os, object, DNODE_MUST_BE_FREE, 71 FTAG, &dn); 72 if (dn) 73 break; 74 75 if (dmu_object_next(os, &object, B_TRUE) == 0) 76 osi->os_obj_next = object - 1; 77 } 78 79 dnode_allocate(dn, ot, blocksize, 0, bonustype, bonuslen, tx); 80 dnode_rele(dn, FTAG); 81 82 mutex_exit(&osi->os_obj_lock); 83 84 dmu_tx_add_new_object(tx, os, object); 85 return (object); 86 } 87 88 int 89 dmu_object_claim(objset_t *os, uint64_t object, dmu_object_type_t ot, 90 int blocksize, dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx) 91 { 92 dnode_t *dn; 93 int err; 94 95 if (object == DMU_META_DNODE_OBJECT && !dmu_tx_private_ok(tx)) 96 return (EBADF); 97 98 err = dnode_hold_impl(os->os, object, DNODE_MUST_BE_FREE, FTAG, &dn); 99 if (err) 100 return (err); 101 dnode_allocate(dn, ot, blocksize, 0, bonustype, bonuslen, tx); 102 dnode_rele(dn, FTAG); 103 104 dmu_tx_add_new_object(tx, os, object); 105 return (0); 106 } 107 108 int 109 dmu_object_reclaim(objset_t *os, uint64_t object, dmu_object_type_t ot, 110 int blocksize, dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx) 111 { 112 dnode_t *dn; 113 int err; 114 115 if (object == DMU_META_DNODE_OBJECT && !dmu_tx_private_ok(tx)) 116 return (EBADF); 117 118 err = dnode_hold_impl(os->os, object, DNODE_MUST_BE_ALLOCATED, 119 FTAG, &dn); 120 if (err) 121 return (err); 122 dnode_reallocate(dn, ot, blocksize, bonustype, bonuslen, tx); 123 dnode_rele(dn, FTAG); 124 125 return (0); 126 } 127 128 int 129 dmu_object_free(objset_t *os, uint64_t object, dmu_tx_t *tx) 130 { 131 dnode_t *dn; 132 int err; 133 134 ASSERT(object != DMU_META_DNODE_OBJECT || dmu_tx_private_ok(tx)); 135 136 err = dnode_hold_impl(os->os, object, DNODE_MUST_BE_ALLOCATED, 137 FTAG, &dn); 138 if (err) 139 return (err); 140 141 ASSERT(dn->dn_type != DMU_OT_NONE); 142 dnode_free(dn, tx); 143 dnode_rele(dn, FTAG); 144 145 return (0); 146 } 147 148 int 149 dmu_object_next(objset_t *os, uint64_t *objectp, boolean_t hole) 150 { 151 uint64_t offset = (*objectp + 1) << DNODE_SHIFT; 152 int error; 153 154 error = dnode_next_offset(os->os->os_meta_dnode, 155 hole, &offset, 0, DNODES_PER_BLOCK); 156 157 *objectp = offset >> DNODE_SHIFT; 158 159 return (error); 160 } 161