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 2009 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #include <sys/dmu.h> 27 #include <sys/dmu_objset.h> 28 #include <sys/dmu_tx.h> 29 #include <sys/dnode.h> 30 31 uint64_t 32 dmu_object_alloc(objset_t *os, dmu_object_type_t ot, int blocksize, 33 dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx) 34 { 35 objset_impl_t *osi = os->os; 36 uint64_t object; 37 uint64_t L2_dnode_count = DNODES_PER_BLOCK << 38 (osi->os_meta_dnode->dn_indblkshift - SPA_BLKPTRSHIFT); 39 dnode_t *dn = NULL; 40 int restarted = B_FALSE; 41 42 mutex_enter(&osi->os_obj_lock); 43 for (;;) { 44 object = osi->os_obj_next; 45 /* 46 * Each time we polish off an L2 bp worth of dnodes 47 * (2^13 objects), move to another L2 bp that's still 48 * reasonably sparse (at most 1/4 full). Look from the 49 * beginning once, but after that keep looking from here. 50 * If we can't find one, just keep going from here. 51 */ 52 if (P2PHASE(object, L2_dnode_count) == 0) { 53 uint64_t offset = restarted ? object << DNODE_SHIFT : 0; 54 int error = dnode_next_offset(osi->os_meta_dnode, 55 DNODE_FIND_HOLE, 56 &offset, 2, DNODES_PER_BLOCK >> 2, 0); 57 restarted = B_TRUE; 58 if (error == 0) 59 object = offset >> DNODE_SHIFT; 60 } 61 osi->os_obj_next = ++object; 62 63 /* 64 * XXX We should check for an i/o error here and return 65 * up to our caller. Actually we should pre-read it in 66 * dmu_tx_assign(), but there is currently no mechanism 67 * to do so. 68 */ 69 (void) dnode_hold_impl(os->os, object, DNODE_MUST_BE_FREE, 70 FTAG, &dn); 71 if (dn) 72 break; 73 74 if (dmu_object_next(os, &object, B_TRUE, 0) == 0) 75 osi->os_obj_next = object - 1; 76 } 77 78 dnode_allocate(dn, ot, blocksize, 0, bonustype, bonuslen, tx); 79 dnode_rele(dn, FTAG); 80 81 mutex_exit(&osi->os_obj_lock); 82 83 dmu_tx_add_new_object(tx, os, object); 84 return (object); 85 } 86 87 int 88 dmu_object_claim(objset_t *os, uint64_t object, dmu_object_type_t ot, 89 int blocksize, dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx) 90 { 91 dnode_t *dn; 92 int err; 93 94 if (object == DMU_META_DNODE_OBJECT && !dmu_tx_private_ok(tx)) 95 return (EBADF); 96 97 err = dnode_hold_impl(os->os, object, DNODE_MUST_BE_FREE, FTAG, &dn); 98 if (err) 99 return (err); 100 dnode_allocate(dn, ot, blocksize, 0, bonustype, bonuslen, tx); 101 dnode_rele(dn, FTAG); 102 103 dmu_tx_add_new_object(tx, os, object); 104 return (0); 105 } 106 107 int 108 dmu_object_reclaim(objset_t *os, uint64_t object, dmu_object_type_t ot, 109 int blocksize, dmu_object_type_t bonustype, int bonuslen) 110 { 111 dnode_t *dn; 112 dmu_tx_t *tx; 113 int nblkptr; 114 int err; 115 116 if (object == DMU_META_DNODE_OBJECT) 117 return (EBADF); 118 119 err = dnode_hold_impl(os->os, object, DNODE_MUST_BE_ALLOCATED, 120 FTAG, &dn); 121 if (err) 122 return (err); 123 124 if (dn->dn_type == ot && dn->dn_datablksz == blocksize && 125 dn->dn_bonustype == bonustype && dn->dn_bonuslen == bonuslen) { 126 /* nothing is changing, this is a noop */ 127 dnode_rele(dn, FTAG); 128 return (0); 129 } 130 131 tx = dmu_tx_create(os); 132 dmu_tx_hold_bonus(tx, object); 133 err = dmu_tx_assign(tx, TXG_WAIT); 134 if (err) { 135 dmu_tx_abort(tx); 136 dnode_rele(dn, FTAG); 137 return (err); 138 } 139 140 nblkptr = 1 + ((DN_MAX_BONUSLEN - bonuslen) >> SPA_BLKPTRSHIFT); 141 142 /* 143 * If we are losing blkptrs or changing the block size this must 144 * be a new file instance. We must clear out the previous file 145 * contents before we can change this type of metadata in the dnode. 146 */ 147 if (dn->dn_nblkptr > nblkptr || dn->dn_datablksz != blocksize) 148 dmu_free_long_range(os, object, 0, DMU_OBJECT_END); 149 150 dnode_reallocate(dn, ot, blocksize, bonustype, bonuslen, tx); 151 152 dmu_tx_commit(tx); 153 154 dnode_rele(dn, FTAG); 155 156 return (0); 157 } 158 159 int 160 dmu_object_free(objset_t *os, uint64_t object, dmu_tx_t *tx) 161 { 162 dnode_t *dn; 163 int err; 164 165 ASSERT(object != DMU_META_DNODE_OBJECT || dmu_tx_private_ok(tx)); 166 167 err = dnode_hold_impl(os->os, object, DNODE_MUST_BE_ALLOCATED, 168 FTAG, &dn); 169 if (err) 170 return (err); 171 172 ASSERT(dn->dn_type != DMU_OT_NONE); 173 dnode_free_range(dn, 0, DMU_OBJECT_END, tx); 174 dnode_free(dn, tx); 175 dnode_rele(dn, FTAG); 176 177 return (0); 178 } 179 180 int 181 dmu_object_next(objset_t *os, uint64_t *objectp, boolean_t hole, uint64_t txg) 182 { 183 uint64_t offset = (*objectp + 1) << DNODE_SHIFT; 184 int error; 185 186 error = dnode_next_offset(os->os->os_meta_dnode, 187 (hole ? DNODE_FIND_HOLE : 0), &offset, 0, DNODES_PER_BLOCK, txg); 188 189 *objectp = offset >> DNODE_SHIFT; 190 191 return (error); 192 } 193