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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_tx.h> | |
27 | #include <sys/dsl_pool.h> | |
28 | #include <sys/dsl_dir.h> | |
29 | #include <sys/dsl_synctask.h> | |
428870ff | 30 | #include <sys/metaslab.h> |
34dc7c2f BB |
31 | |
32 | #define DST_AVG_BLKSHIFT 14 | |
33 | ||
34 | /* ARGSUSED */ | |
35 | static int | |
36 | dsl_null_checkfunc(void *arg1, void *arg2, dmu_tx_t *tx) | |
37 | { | |
38 | return (0); | |
39 | } | |
40 | ||
41 | dsl_sync_task_group_t * | |
42 | dsl_sync_task_group_create(dsl_pool_t *dp) | |
43 | { | |
44 | dsl_sync_task_group_t *dstg; | |
45 | ||
46 | dstg = kmem_zalloc(sizeof (dsl_sync_task_group_t), KM_SLEEP); | |
47 | list_create(&dstg->dstg_tasks, sizeof (dsl_sync_task_t), | |
48 | offsetof(dsl_sync_task_t, dst_node)); | |
49 | dstg->dstg_pool = dp; | |
34dc7c2f BB |
50 | |
51 | return (dstg); | |
52 | } | |
53 | ||
54 | void | |
55 | dsl_sync_task_create(dsl_sync_task_group_t *dstg, | |
56 | dsl_checkfunc_t *checkfunc, dsl_syncfunc_t *syncfunc, | |
57 | void *arg1, void *arg2, int blocks_modified) | |
58 | { | |
59 | dsl_sync_task_t *dst; | |
60 | ||
61 | if (checkfunc == NULL) | |
62 | checkfunc = dsl_null_checkfunc; | |
63 | dst = kmem_zalloc(sizeof (dsl_sync_task_t), KM_SLEEP); | |
64 | dst->dst_checkfunc = checkfunc; | |
65 | dst->dst_syncfunc = syncfunc; | |
66 | dst->dst_arg1 = arg1; | |
67 | dst->dst_arg2 = arg2; | |
68 | list_insert_tail(&dstg->dstg_tasks, dst); | |
69 | ||
70 | dstg->dstg_space += blocks_modified << DST_AVG_BLKSHIFT; | |
71 | } | |
72 | ||
73 | int | |
74 | dsl_sync_task_group_wait(dsl_sync_task_group_t *dstg) | |
75 | { | |
76 | dmu_tx_t *tx; | |
77 | uint64_t txg; | |
78 | dsl_sync_task_t *dst; | |
79 | ||
80 | top: | |
81 | tx = dmu_tx_create_dd(dstg->dstg_pool->dp_mos_dir); | |
82 | VERIFY(0 == dmu_tx_assign(tx, TXG_WAIT)); | |
83 | ||
84 | txg = dmu_tx_get_txg(tx); | |
85 | ||
86 | /* Do a preliminary error check. */ | |
87 | dstg->dstg_err = 0; | |
88 | rw_enter(&dstg->dstg_pool->dp_config_rwlock, RW_READER); | |
89 | for (dst = list_head(&dstg->dstg_tasks); dst; | |
90 | dst = list_next(&dstg->dstg_tasks, dst)) { | |
91 | #ifdef ZFS_DEBUG | |
92 | /* | |
93 | * Only check half the time, otherwise, the sync-context | |
94 | * check will almost never fail. | |
95 | */ | |
96 | if (spa_get_random(2) == 0) | |
97 | continue; | |
98 | #endif | |
99 | dst->dst_err = | |
100 | dst->dst_checkfunc(dst->dst_arg1, dst->dst_arg2, tx); | |
101 | if (dst->dst_err) | |
102 | dstg->dstg_err = dst->dst_err; | |
103 | } | |
104 | rw_exit(&dstg->dstg_pool->dp_config_rwlock); | |
105 | ||
106 | if (dstg->dstg_err) { | |
107 | dmu_tx_commit(tx); | |
108 | return (dstg->dstg_err); | |
109 | } | |
110 | ||
428870ff BB |
111 | /* |
112 | * We don't generally have many sync tasks, so pay the price of | |
113 | * add_tail to get the tasks executed in the right order. | |
114 | */ | |
115 | VERIFY(0 == txg_list_add_tail(&dstg->dstg_pool->dp_sync_tasks, | |
116 | dstg, txg)); | |
34dc7c2f BB |
117 | |
118 | dmu_tx_commit(tx); | |
119 | ||
120 | txg_wait_synced(dstg->dstg_pool, txg); | |
121 | ||
428870ff BB |
122 | if (dstg->dstg_err == EAGAIN) { |
123 | txg_wait_synced(dstg->dstg_pool, txg + TXG_DEFER_SIZE); | |
34dc7c2f | 124 | goto top; |
428870ff | 125 | } |
34dc7c2f BB |
126 | |
127 | return (dstg->dstg_err); | |
128 | } | |
129 | ||
130 | void | |
131 | dsl_sync_task_group_nowait(dsl_sync_task_group_t *dstg, dmu_tx_t *tx) | |
132 | { | |
133 | uint64_t txg; | |
134 | ||
135 | dstg->dstg_nowaiter = B_TRUE; | |
136 | txg = dmu_tx_get_txg(tx); | |
428870ff BB |
137 | /* |
138 | * We don't generally have many sync tasks, so pay the price of | |
139 | * add_tail to get the tasks executed in the right order. | |
140 | */ | |
141 | VERIFY(0 == txg_list_add_tail(&dstg->dstg_pool->dp_sync_tasks, | |
142 | dstg, txg)); | |
34dc7c2f BB |
143 | } |
144 | ||
145 | void | |
146 | dsl_sync_task_group_destroy(dsl_sync_task_group_t *dstg) | |
147 | { | |
148 | dsl_sync_task_t *dst; | |
149 | ||
c65aa5b2 | 150 | while ((dst = list_head(&dstg->dstg_tasks))) { |
34dc7c2f BB |
151 | list_remove(&dstg->dstg_tasks, dst); |
152 | kmem_free(dst, sizeof (dsl_sync_task_t)); | |
153 | } | |
154 | kmem_free(dstg, sizeof (dsl_sync_task_group_t)); | |
155 | } | |
156 | ||
157 | void | |
158 | dsl_sync_task_group_sync(dsl_sync_task_group_t *dstg, dmu_tx_t *tx) | |
159 | { | |
160 | dsl_sync_task_t *dst; | |
428870ff BB |
161 | dsl_pool_t *dp = dstg->dstg_pool; |
162 | uint64_t quota, used; | |
34dc7c2f BB |
163 | |
164 | ASSERT3U(dstg->dstg_err, ==, 0); | |
165 | ||
166 | /* | |
428870ff BB |
167 | * Check for sufficient space. We just check against what's |
168 | * on-disk; we don't want any in-flight accounting to get in our | |
169 | * way, because open context may have already used up various | |
170 | * in-core limits (arc_tempreserve, dsl_pool_tempreserve). | |
34dc7c2f | 171 | */ |
428870ff BB |
172 | quota = dsl_pool_adjustedsize(dp, B_FALSE) - |
173 | metaslab_class_get_deferred(spa_normal_class(dp->dp_spa)); | |
174 | used = dp->dp_root_dir->dd_phys->dd_used_bytes; | |
175 | /* MOS space is triple-dittoed, so we multiply by 3. */ | |
176 | if (dstg->dstg_space > 0 && used + dstg->dstg_space * 3 > quota) { | |
177 | dstg->dstg_err = ENOSPC; | |
34dc7c2f | 178 | return; |
428870ff | 179 | } |
34dc7c2f BB |
180 | |
181 | /* | |
182 | * Check for errors by calling checkfuncs. | |
183 | */ | |
428870ff | 184 | rw_enter(&dp->dp_config_rwlock, RW_WRITER); |
34dc7c2f BB |
185 | for (dst = list_head(&dstg->dstg_tasks); dst; |
186 | dst = list_next(&dstg->dstg_tasks, dst)) { | |
187 | dst->dst_err = | |
188 | dst->dst_checkfunc(dst->dst_arg1, dst->dst_arg2, tx); | |
189 | if (dst->dst_err) | |
190 | dstg->dstg_err = dst->dst_err; | |
191 | } | |
192 | ||
193 | if (dstg->dstg_err == 0) { | |
194 | /* | |
195 | * Execute sync tasks. | |
196 | */ | |
197 | for (dst = list_head(&dstg->dstg_tasks); dst; | |
198 | dst = list_next(&dstg->dstg_tasks, dst)) { | |
428870ff | 199 | dst->dst_syncfunc(dst->dst_arg1, dst->dst_arg2, tx); |
34dc7c2f BB |
200 | } |
201 | } | |
428870ff | 202 | rw_exit(&dp->dp_config_rwlock); |
34dc7c2f BB |
203 | |
204 | if (dstg->dstg_nowaiter) | |
205 | dsl_sync_task_group_destroy(dstg); | |
206 | } | |
207 | ||
208 | int | |
209 | dsl_sync_task_do(dsl_pool_t *dp, | |
210 | dsl_checkfunc_t *checkfunc, dsl_syncfunc_t *syncfunc, | |
211 | void *arg1, void *arg2, int blocks_modified) | |
212 | { | |
213 | dsl_sync_task_group_t *dstg; | |
214 | int err; | |
215 | ||
572e2857 BB |
216 | ASSERT(spa_writeable(dp->dp_spa)); |
217 | ||
34dc7c2f BB |
218 | dstg = dsl_sync_task_group_create(dp); |
219 | dsl_sync_task_create(dstg, checkfunc, syncfunc, | |
220 | arg1, arg2, blocks_modified); | |
221 | err = dsl_sync_task_group_wait(dstg); | |
222 | dsl_sync_task_group_destroy(dstg); | |
223 | return (err); | |
224 | } | |
225 | ||
226 | void | |
227 | dsl_sync_task_do_nowait(dsl_pool_t *dp, | |
228 | dsl_checkfunc_t *checkfunc, dsl_syncfunc_t *syncfunc, | |
229 | void *arg1, void *arg2, int blocks_modified, dmu_tx_t *tx) | |
230 | { | |
231 | dsl_sync_task_group_t *dstg; | |
232 | ||
572e2857 BB |
233 | if (!spa_writeable(dp->dp_spa)) |
234 | return; | |
235 | ||
34dc7c2f BB |
236 | dstg = dsl_sync_task_group_create(dp); |
237 | dsl_sync_task_create(dstg, checkfunc, syncfunc, | |
238 | arg1, arg2, blocks_modified); | |
239 | dsl_sync_task_group_nowait(dstg, tx); | |
240 | } | |
c28b2279 BB |
241 | |
242 | #if defined(_KERNEL) && defined(HAVE_SPL) | |
243 | EXPORT_SYMBOL(dsl_sync_task_do); | |
244 | EXPORT_SYMBOL(dsl_sync_task_do_nowait); | |
245 | #endif |