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34dc7c2f BB |
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 | /* | |
428870ff | 22 | * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. |
34dc7c2f BB |
23 | */ |
24 | ||
34dc7c2f BB |
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 | { | |
34dc7c2f BB |
34 | uint64_t object; |
35 | uint64_t L2_dnode_count = DNODES_PER_BLOCK << | |
428870ff | 36 | (os->os_meta_dnode->dn_indblkshift - SPA_BLKPTRSHIFT); |
34dc7c2f BB |
37 | dnode_t *dn = NULL; |
38 | int restarted = B_FALSE; | |
39 | ||
428870ff | 40 | mutex_enter(&os->os_obj_lock); |
34dc7c2f | 41 | for (;;) { |
428870ff | 42 | object = os->os_obj_next; |
34dc7c2f BB |
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; | |
428870ff | 52 | int error = dnode_next_offset(os->os_meta_dnode, |
b128c09f BB |
53 | DNODE_FIND_HOLE, |
54 | &offset, 2, DNODES_PER_BLOCK >> 2, 0); | |
34dc7c2f BB |
55 | restarted = B_TRUE; |
56 | if (error == 0) | |
57 | object = offset >> DNODE_SHIFT; | |
58 | } | |
428870ff | 59 | os->os_obj_next = ++object; |
34dc7c2f BB |
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 | */ | |
428870ff | 67 | (void) dnode_hold_impl(os, object, DNODE_MUST_BE_FREE, |
34dc7c2f BB |
68 | FTAG, &dn); |
69 | if (dn) | |
70 | break; | |
71 | ||
72 | if (dmu_object_next(os, &object, B_TRUE, 0) == 0) | |
428870ff | 73 | os->os_obj_next = object - 1; |
34dc7c2f BB |
74 | } |
75 | ||
76 | dnode_allocate(dn, ot, blocksize, 0, bonustype, bonuslen, tx); | |
77 | dnode_rele(dn, FTAG); | |
78 | ||
428870ff | 79 | mutex_exit(&os->os_obj_lock); |
34dc7c2f BB |
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 | ||
428870ff | 95 | err = dnode_hold_impl(os, object, DNODE_MUST_BE_FREE, FTAG, &dn); |
34dc7c2f BB |
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, | |
9babb374 | 107 | int blocksize, dmu_object_type_t bonustype, int bonuslen) |
34dc7c2f BB |
108 | { |
109 | dnode_t *dn; | |
9babb374 BB |
110 | dmu_tx_t *tx; |
111 | int nblkptr; | |
34dc7c2f BB |
112 | int err; |
113 | ||
9babb374 | 114 | if (object == DMU_META_DNODE_OBJECT) |
34dc7c2f BB |
115 | return (EBADF); |
116 | ||
428870ff | 117 | err = dnode_hold_impl(os, object, DNODE_MUST_BE_ALLOCATED, |
34dc7c2f BB |
118 | FTAG, &dn); |
119 | if (err) | |
120 | return (err); | |
9babb374 BB |
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 | ||
428870ff BB |
129 | if (bonustype == DMU_OT_SA) { |
130 | nblkptr = 1; | |
131 | } else { | |
132 | nblkptr = 1 + ((DN_MAX_BONUSLEN - bonuslen) >> SPA_BLKPTRSHIFT); | |
133 | } | |
9babb374 BB |
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 | ||
34dc7c2f | 154 | dnode_reallocate(dn, ot, blocksize, bonustype, bonuslen, tx); |
9babb374 BB |
155 | |
156 | dmu_tx_commit(tx); | |
157 | out: | |
34dc7c2f BB |
158 | dnode_rele(dn, FTAG); |
159 | ||
9babb374 | 160 | return (err); |
34dc7c2f BB |
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 | ||
428870ff | 171 | err = dnode_hold_impl(os, object, DNODE_MUST_BE_ALLOCATED, |
34dc7c2f BB |
172 | FTAG, &dn); |
173 | if (err) | |
174 | return (err); | |
175 | ||
176 | ASSERT(dn->dn_type != DMU_OT_NONE); | |
b128c09f | 177 | dnode_free_range(dn, 0, DMU_OBJECT_END, tx); |
34dc7c2f BB |
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 | ||
428870ff | 190 | error = dnode_next_offset(os->os_meta_dnode, |
b128c09f | 191 | (hole ? DNODE_FIND_HOLE : 0), &offset, 0, DNODES_PER_BLOCK, txg); |
34dc7c2f BB |
192 | |
193 | *objectp = offset >> DNODE_SHIFT; | |
194 | ||
195 | return (error); | |
196 | } |