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