1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
|
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 2012 by Delphix. All rights reserved.
*/
#include <sys/arc.h>
#include <sys/bptree.h>
#include <sys/dmu.h>
#include <sys/dmu_objset.h>
#include <sys/dmu_tx.h>
#include <sys/dmu_traverse.h>
#include <sys/dsl_dataset.h>
#include <sys/dsl_dir.h>
#include <sys/dsl_pool.h>
#include <sys/dnode.h>
#include <sys/refcount.h>
#include <sys/spa.h>
/*
* A bptree is a queue of root block pointers from destroyed datasets. When a
* dataset is destroyed its root block pointer is put on the end of the pool's
* bptree queue so the dataset's blocks can be freed asynchronously by
* dsl_scan_sync. This allows the delete operation to finish without traversing
* all the dataset's blocks.
*
* Note that while bt_begin and bt_end are only ever incremented in this code
* they are effectively reset to 0 every time the entire bptree is freed because
* the bptree's object is destroyed and re-created.
*/
struct bptree_args {
bptree_phys_t *ba_phys; /* data in bonus buffer, dirtied if freeing */
boolean_t ba_free; /* true if freeing during traversal */
bptree_itor_t *ba_func; /* function to call for each blockpointer */
void *ba_arg; /* caller supplied argument to ba_func */
dmu_tx_t *ba_tx; /* caller supplied tx, NULL if not freeing */
} bptree_args_t;
uint64_t
bptree_alloc(objset_t *os, dmu_tx_t *tx)
{
uint64_t obj;
dmu_buf_t *db;
bptree_phys_t *bt;
obj = dmu_object_alloc(os, DMU_OTN_UINT64_METADATA,
SPA_MAXBLOCKSIZE, DMU_OTN_UINT64_METADATA,
sizeof (bptree_phys_t), tx);
/*
* Bonus buffer contents are already initialized to 0, but for
* readability we make it explicit.
*/
VERIFY3U(0, ==, dmu_bonus_hold(os, obj, FTAG, &db));
dmu_buf_will_dirty(db, tx);
bt = db->db_data;
bt->bt_begin = 0;
bt->bt_end = 0;
bt->bt_bytes = 0;
bt->bt_comp = 0;
bt->bt_uncomp = 0;
dmu_buf_rele(db, FTAG);
return (obj);
}
int
bptree_free(objset_t *os, uint64_t obj, dmu_tx_t *tx)
{
dmu_buf_t *db;
bptree_phys_t *bt;
VERIFY3U(0, ==, dmu_bonus_hold(os, obj, FTAG, &db));
bt = db->db_data;
ASSERT3U(bt->bt_begin, ==, bt->bt_end);
ASSERT0(bt->bt_bytes);
ASSERT0(bt->bt_comp);
ASSERT0(bt->bt_uncomp);
dmu_buf_rele(db, FTAG);
return (dmu_object_free(os, obj, tx));
}
void
bptree_add(objset_t *os, uint64_t obj, blkptr_t *bp, uint64_t birth_txg,
uint64_t bytes, uint64_t comp, uint64_t uncomp, dmu_tx_t *tx)
{
dmu_buf_t *db;
bptree_phys_t *bt;
bptree_entry_phys_t bte;
/*
* bptree objects are in the pool mos, therefore they can only be
* modified in syncing context. Furthermore, this is only modified
* by the sync thread, so no locking is necessary.
*/
ASSERT(dmu_tx_is_syncing(tx));
VERIFY3U(0, ==, dmu_bonus_hold(os, obj, FTAG, &db));
bt = db->db_data;
bte.be_birth_txg = birth_txg;
bte.be_bp = *bp;
bzero(&bte.be_zb, sizeof (bte.be_zb));
dmu_write(os, obj, bt->bt_end * sizeof (bte), sizeof (bte), &bte, tx);
dmu_buf_will_dirty(db, tx);
bt->bt_end++;
bt->bt_bytes += bytes;
bt->bt_comp += comp;
bt->bt_uncomp += uncomp;
dmu_buf_rele(db, FTAG);
}
/* ARGSUSED */
static int
bptree_visit_cb(spa_t *spa, zilog_t *zilog, const blkptr_t *bp,
const zbookmark_t *zb, const dnode_phys_t *dnp, void *arg)
{
int err;
struct bptree_args *ba = arg;
if (bp == NULL)
return (0);
err = ba->ba_func(ba->ba_arg, bp, ba->ba_tx);
if (err == 0 && ba->ba_free) {
ba->ba_phys->bt_bytes -= bp_get_dsize_sync(spa, bp);
ba->ba_phys->bt_comp -= BP_GET_PSIZE(bp);
ba->ba_phys->bt_uncomp -= BP_GET_UCSIZE(bp);
}
return (err);
}
int
bptree_iterate(objset_t *os, uint64_t obj, boolean_t free, bptree_itor_t func,
void *arg, dmu_tx_t *tx)
{
int err;
uint64_t i;
dmu_buf_t *db;
struct bptree_args ba;
ASSERT(!free || dmu_tx_is_syncing(tx));
err = dmu_bonus_hold(os, obj, FTAG, &db);
if (err != 0)
return (err);
if (free)
dmu_buf_will_dirty(db, tx);
ba.ba_phys = db->db_data;
ba.ba_free = free;
ba.ba_func = func;
ba.ba_arg = arg;
ba.ba_tx = tx;
err = 0;
for (i = ba.ba_phys->bt_begin; i < ba.ba_phys->bt_end; i++) {
bptree_entry_phys_t bte;
ASSERT(!free || i == ba.ba_phys->bt_begin);
err = dmu_read(os, obj, i * sizeof (bte), sizeof (bte),
&bte, DMU_READ_NO_PREFETCH);
if (err != 0)
break;
err = traverse_dataset_destroyed(os->os_spa, &bte.be_bp,
bte.be_birth_txg, &bte.be_zb,
TRAVERSE_PREFETCH_METADATA | TRAVERSE_POST,
bptree_visit_cb, &ba);
if (free) {
ASSERT(err == 0 || err == ERESTART);
if (err != 0) {
/* save bookmark for future resume */
ASSERT3U(bte.be_zb.zb_objset, ==,
ZB_DESTROYED_OBJSET);
ASSERT0(bte.be_zb.zb_level);
dmu_write(os, obj, i * sizeof (bte),
sizeof (bte), &bte, tx);
break;
} else {
ba.ba_phys->bt_begin++;
(void) dmu_free_range(os, obj,
i * sizeof (bte), sizeof (bte), tx);
}
}
}
ASSERT(!free || err != 0 || ba.ba_phys->bt_begin == ba.ba_phys->bt_end);
/* if all blocks are free there should be no used space */
if (ba.ba_phys->bt_begin == ba.ba_phys->bt_end) {
ASSERT0(ba.ba_phys->bt_bytes);
ASSERT0(ba.ba_phys->bt_comp);
ASSERT0(ba.ba_phys->bt_uncomp);
}
dmu_buf_rele(db, FTAG);
return (err);
}
|
