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 by Delphix. All rights reserved.
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 #include <sys/zap.h>
31 #include <sys/zfeature.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 uint64_t object;
38 uint64_t L2_dnode_count = DNODES_PER_BLOCK <<
39 (DMU_META_DNODE(os)->dn_indblkshift - SPA_BLKPTRSHIFT);
40 dnode_t *dn = NULL;
41 int restarted = B_FALSE;
42
43 mutex_enter(&os->os_obj_lock);
44 for (;;) {
45 object = os->os_obj_next;
46 /*
47 * Each time we polish off an L2 bp worth of dnodes
48 * (2^13 objects), move to another L2 bp that's still
49 * reasonably sparse (at most 1/4 full). Look from the
50 * beginning once, but after that keep looking from here.
51 * If we can't find one, just keep going from here.
52 */
53 if (P2PHASE(object, L2_dnode_count) == 0) {
54 uint64_t offset = restarted ? object << DNODE_SHIFT : 0;
55 int error = dnode_next_offset(DMU_META_DNODE(os),
56 DNODE_FIND_HOLE,
57 &offset, 2, DNODES_PER_BLOCK >> 2, 0);
58 restarted = B_TRUE;
59 if (error == 0)
60 object = offset >> DNODE_SHIFT;
61 }
62 os->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, object, DNODE_MUST_BE_FREE,
71 FTAG, &dn);
72 if (dn)
73 break;
74
75 if (dmu_object_next(os, &object, B_TRUE, 0) == 0)
76 os->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(&os->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 (SET_ERROR(EBADF));
97
98 err = dnode_hold_impl(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)
111 {
112 dnode_t *dn;
113 dmu_tx_t *tx;
114 int nblkptr;
115 int err;
116
117 if (object == DMU_META_DNODE_OBJECT)
118 return (SET_ERROR(EBADF));
119
120 err = dnode_hold_impl(os, object, DNODE_MUST_BE_ALLOCATED,
121 FTAG, &dn);
122 if (err)
123 return (err);
124
125 if (dn->dn_type == ot && dn->dn_datablksz == blocksize &&
126 dn->dn_bonustype == bonustype && dn->dn_bonuslen == bonuslen) {
127 /* nothing is changing, this is a noop */
128 dnode_rele(dn, FTAG);
129 return (0);
130 }
131
132 if (bonustype == DMU_OT_SA) {
133 nblkptr = 1;
134 } else {
135 nblkptr = 1 + ((DN_MAX_BONUSLEN - bonuslen) >> SPA_BLKPTRSHIFT);
136 }
137
138 /*
139 * If we are losing blkptrs or changing the block size this must
140 * be a new file instance. We must clear out the previous file
141 * contents before we can change this type of metadata in the dnode.
142 */
143 if (dn->dn_nblkptr > nblkptr || dn->dn_datablksz != blocksize) {
144 err = dmu_free_long_range(os, object, 0, DMU_OBJECT_END);
145 if (err)
146 goto out;
147 }
148
149 tx = dmu_tx_create(os);
150 dmu_tx_hold_bonus(tx, object);
151 err = dmu_tx_assign(tx, TXG_WAIT);
152 if (err) {
153 dmu_tx_abort(tx);
154 goto out;
155 }
156
157 dnode_reallocate(dn, ot, blocksize, bonustype, bonuslen, tx);
158
159 dmu_tx_commit(tx);
160 out:
161 dnode_rele(dn, FTAG);
162
163 return (err);
164 }
165
166 int
167 dmu_object_free(objset_t *os, uint64_t object, dmu_tx_t *tx)
168 {
169 dnode_t *dn;
170 int err;
171
172 ASSERT(object != DMU_META_DNODE_OBJECT || dmu_tx_private_ok(tx));
173
174 err = dnode_hold_impl(os, object, DNODE_MUST_BE_ALLOCATED,
175 FTAG, &dn);
176 if (err)
177 return (err);
178
179 ASSERT(dn->dn_type != DMU_OT_NONE);
180 dnode_free_range(dn, 0, DMU_OBJECT_END, tx);
181 dnode_free(dn, tx);
182 dnode_rele(dn, FTAG);
183
184 return (0);
185 }
186
187 int
188 dmu_object_next(objset_t *os, uint64_t *objectp, boolean_t hole, uint64_t txg)
189 {
190 uint64_t offset = (*objectp + 1) << DNODE_SHIFT;
191 int error;
192
193 error = dnode_next_offset(DMU_META_DNODE(os),
194 (hole ? DNODE_FIND_HOLE : 0), &offset, 0, DNODES_PER_BLOCK, txg);
195
196 *objectp = offset >> DNODE_SHIFT;
197
198 return (error);
199 }
200
201 /*
202 * Turn this object from old_type into DMU_OTN_ZAP_METADATA, and bump the
203 * refcount on SPA_FEATURE_EXTENSIBLE_DATASET.
204 *
205 * Only for use from syncing context, on MOS objects.
206 */
207 void
208 dmu_object_zapify(objset_t *mos, uint64_t object, dmu_object_type_t old_type,
209 dmu_tx_t *tx)
210 {
211 dnode_t *dn;
212
213 ASSERT(dmu_tx_is_syncing(tx));
214
215 VERIFY0(dnode_hold(mos, object, FTAG, &dn));
216 if (dn->dn_type == DMU_OTN_ZAP_METADATA) {
217 dnode_rele(dn, FTAG);
218 return;
219 }
220 ASSERT3U(dn->dn_type, ==, old_type);
221 ASSERT0(dn->dn_maxblkid);
222 dn->dn_next_type[tx->tx_txg & TXG_MASK] = dn->dn_type =
223 DMU_OTN_ZAP_METADATA;
224 dnode_setdirty(dn, tx);
225 dnode_rele(dn, FTAG);
226
227 mzap_create_impl(mos, object, 0, 0, tx);
228
229 spa_feature_incr(dmu_objset_spa(mos),
230 SPA_FEATURE_EXTENSIBLE_DATASET, tx);
231 }
232
233 void
234 dmu_object_free_zapified(objset_t *mos, uint64_t object, dmu_tx_t *tx)
235 {
236 dnode_t *dn;
237 dmu_object_type_t t;
238
239 ASSERT(dmu_tx_is_syncing(tx));
240
241 VERIFY0(dnode_hold(mos, object, FTAG, &dn));
242 t = dn->dn_type;
243 dnode_rele(dn, FTAG);
244
245 if (t == DMU_OTN_ZAP_METADATA) {
246 spa_feature_decr(dmu_objset_spa(mos),
247 SPA_FEATURE_EXTENSIBLE_DATASET, tx);
248 }
249 VERIFY0(dmu_object_free(mos, object, tx));
250 }