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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. |
64fc7762 | 23 | * Copyright (c) 2011, 2017 by Delphix. All rights reserved. |
95fd54a1 | 24 | * Copyright (c) 2013 Steven Hartland. All rights reserved. |
0c66c32d | 25 | * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved. |
539d33c7 | 26 | * Copyright 2016 Nexenta Systems, Inc. All rights reserved. |
34dc7c2f BB |
27 | */ |
28 | ||
34dc7c2f BB |
29 | #include <sys/dsl_pool.h> |
30 | #include <sys/dsl_dataset.h> | |
428870ff | 31 | #include <sys/dsl_prop.h> |
34dc7c2f BB |
32 | #include <sys/dsl_dir.h> |
33 | #include <sys/dsl_synctask.h> | |
428870ff BB |
34 | #include <sys/dsl_scan.h> |
35 | #include <sys/dnode.h> | |
34dc7c2f BB |
36 | #include <sys/dmu_tx.h> |
37 | #include <sys/dmu_objset.h> | |
38 | #include <sys/arc.h> | |
39 | #include <sys/zap.h> | |
40 | #include <sys/zio.h> | |
41 | #include <sys/zfs_context.h> | |
42 | #include <sys/fs/zfs.h> | |
b128c09f BB |
43 | #include <sys/zfs_znode.h> |
44 | #include <sys/spa_impl.h> | |
428870ff | 45 | #include <sys/dsl_deadlist.h> |
9ae529ec CS |
46 | #include <sys/bptree.h> |
47 | #include <sys/zfeature.h> | |
29809a6c | 48 | #include <sys/zil_impl.h> |
13fe0198 | 49 | #include <sys/dsl_userhold.h> |
49ee64e5 | 50 | #include <sys/trace_txg.h> |
379ca9cf | 51 | #include <sys/mmp.h> |
34dc7c2f | 52 | |
e8b96c60 MA |
53 | /* |
54 | * ZFS Write Throttle | |
55 | * ------------------ | |
56 | * | |
57 | * ZFS must limit the rate of incoming writes to the rate at which it is able | |
58 | * to sync data modifications to the backend storage. Throttling by too much | |
59 | * creates an artificial limit; throttling by too little can only be sustained | |
60 | * for short periods and would lead to highly lumpy performance. On a per-pool | |
61 | * basis, ZFS tracks the amount of modified (dirty) data. As operations change | |
62 | * data, the amount of dirty data increases; as ZFS syncs out data, the amount | |
63 | * of dirty data decreases. When the amount of dirty data exceeds a | |
64 | * predetermined threshold further modifications are blocked until the amount | |
65 | * of dirty data decreases (as data is synced out). | |
66 | * | |
67 | * The limit on dirty data is tunable, and should be adjusted according to | |
68 | * both the IO capacity and available memory of the system. The larger the | |
69 | * window, the more ZFS is able to aggregate and amortize metadata (and data) | |
70 | * changes. However, memory is a limited resource, and allowing for more dirty | |
71 | * data comes at the cost of keeping other useful data in memory (for example | |
72 | * ZFS data cached by the ARC). | |
73 | * | |
74 | * Implementation | |
75 | * | |
76 | * As buffers are modified dsl_pool_willuse_space() increments both the per- | |
77 | * txg (dp_dirty_pertxg[]) and poolwide (dp_dirty_total) accounting of | |
78 | * dirty space used; dsl_pool_dirty_space() decrements those values as data | |
79 | * is synced out from dsl_pool_sync(). While only the poolwide value is | |
80 | * relevant, the per-txg value is useful for debugging. The tunable | |
81 | * zfs_dirty_data_max determines the dirty space limit. Once that value is | |
82 | * exceeded, new writes are halted until space frees up. | |
83 | * | |
84 | * The zfs_dirty_data_sync tunable dictates the threshold at which we | |
85 | * ensure that there is a txg syncing (see the comment in txg.c for a full | |
86 | * description of transaction group stages). | |
87 | * | |
88 | * The IO scheduler uses both the dirty space limit and current amount of | |
89 | * dirty data as inputs. Those values affect the number of concurrent IOs ZFS | |
90 | * issues. See the comment in vdev_queue.c for details of the IO scheduler. | |
91 | * | |
92 | * The delay is also calculated based on the amount of dirty data. See the | |
93 | * comment above dmu_tx_delay() for details. | |
94 | */ | |
95 | ||
96 | /* | |
97 | * zfs_dirty_data_max will be set to zfs_dirty_data_max_percent% of all memory, | |
98 | * capped at zfs_dirty_data_max_max. It can also be overridden with a module | |
99 | * parameter. | |
100 | */ | |
101 | unsigned long zfs_dirty_data_max = 0; | |
102 | unsigned long zfs_dirty_data_max_max = 0; | |
103 | int zfs_dirty_data_max_percent = 10; | |
104 | int zfs_dirty_data_max_max_percent = 25; | |
b128c09f | 105 | |
e8b96c60 MA |
106 | /* |
107 | * If there is at least this much dirty data, push out a txg. | |
108 | */ | |
109 | unsigned long zfs_dirty_data_sync = 64 * 1024 * 1024; | |
34dc7c2f | 110 | |
e8b96c60 MA |
111 | /* |
112 | * Once there is this amount of dirty data, the dmu_tx_delay() will kick in | |
113 | * and delay each transaction. | |
114 | * This value should be >= zfs_vdev_async_write_active_max_dirty_percent. | |
115 | */ | |
116 | int zfs_delay_min_dirty_percent = 60; | |
b128c09f | 117 | |
e8b96c60 MA |
118 | /* |
119 | * This controls how quickly the delay approaches infinity. | |
120 | * Larger values cause it to delay more for a given amount of dirty data. | |
121 | * Therefore larger values will cause there to be less dirty data for a | |
122 | * given throughput. | |
123 | * | |
124 | * For the smoothest delay, this value should be about 1 billion divided | |
125 | * by the maximum number of operations per second. This will smoothly | |
126 | * handle between 10x and 1/10th this number. | |
127 | * | |
128 | * Note: zfs_delay_scale * zfs_dirty_data_max must be < 2^64, due to the | |
129 | * multiply in dmu_tx_delay(). | |
130 | */ | |
131 | unsigned long zfs_delay_scale = 1000 * 1000 * 1000 / 2000; | |
b128c09f | 132 | |
64fc7762 MA |
133 | /* |
134 | * This determines the number of threads used by the dp_sync_taskq. | |
135 | */ | |
136 | int zfs_sync_taskq_batch_pct = 75; | |
137 | ||
428870ff | 138 | int |
b128c09f | 139 | dsl_pool_open_special_dir(dsl_pool_t *dp, const char *name, dsl_dir_t **ddp) |
34dc7c2f BB |
140 | { |
141 | uint64_t obj; | |
142 | int err; | |
143 | ||
144 | err = zap_lookup(dp->dp_meta_objset, | |
d683ddbb | 145 | dsl_dir_phys(dp->dp_root_dir)->dd_child_dir_zapobj, |
b128c09f | 146 | name, sizeof (obj), 1, &obj); |
34dc7c2f BB |
147 | if (err) |
148 | return (err); | |
149 | ||
13fe0198 | 150 | return (dsl_dir_hold_obj(dp, obj, name, dp, ddp)); |
34dc7c2f BB |
151 | } |
152 | ||
153 | static dsl_pool_t * | |
154 | dsl_pool_open_impl(spa_t *spa, uint64_t txg) | |
155 | { | |
156 | dsl_pool_t *dp; | |
157 | blkptr_t *bp = spa_get_rootblkptr(spa); | |
34dc7c2f BB |
158 | |
159 | dp = kmem_zalloc(sizeof (dsl_pool_t), KM_SLEEP); | |
160 | dp->dp_spa = spa; | |
161 | dp->dp_meta_rootbp = *bp; | |
13fe0198 | 162 | rrw_init(&dp->dp_config_rwlock, B_TRUE); |
34dc7c2f | 163 | txg_init(dp, txg); |
379ca9cf | 164 | mmp_init(spa); |
34dc7c2f | 165 | |
4747a7d3 | 166 | txg_list_create(&dp->dp_dirty_datasets, spa, |
34dc7c2f | 167 | offsetof(dsl_dataset_t, ds_dirty_link)); |
4747a7d3 | 168 | txg_list_create(&dp->dp_dirty_zilogs, spa, |
29809a6c | 169 | offsetof(zilog_t, zl_dirty_link)); |
4747a7d3 | 170 | txg_list_create(&dp->dp_dirty_dirs, spa, |
34dc7c2f | 171 | offsetof(dsl_dir_t, dd_dirty_link)); |
4747a7d3 | 172 | txg_list_create(&dp->dp_sync_tasks, spa, |
13fe0198 | 173 | offsetof(dsl_sync_task_t, dst_node)); |
34dc7c2f | 174 | |
64fc7762 MA |
175 | dp->dp_sync_taskq = taskq_create("dp_sync_taskq", |
176 | zfs_sync_taskq_batch_pct, minclsyspri, 1, INT_MAX, | |
177 | TASKQ_THREADS_CPU_PCT); | |
178 | ||
34dc7c2f | 179 | mutex_init(&dp->dp_lock, NULL, MUTEX_DEFAULT, NULL); |
e8b96c60 | 180 | cv_init(&dp->dp_spaceavail_cv, NULL, CV_DEFAULT, NULL); |
34dc7c2f | 181 | |
1229323d | 182 | dp->dp_iput_taskq = taskq_create("z_iput", max_ncpus, defclsyspri, |
aa9af22c | 183 | max_ncpus * 8, INT_MAX, TASKQ_PREPOPULATE | TASKQ_DYNAMIC); |
9babb374 | 184 | |
34dc7c2f BB |
185 | return (dp); |
186 | } | |
187 | ||
188 | int | |
9ae529ec | 189 | dsl_pool_init(spa_t *spa, uint64_t txg, dsl_pool_t **dpp) |
34dc7c2f BB |
190 | { |
191 | int err; | |
192 | dsl_pool_t *dp = dsl_pool_open_impl(spa, txg); | |
9ae529ec | 193 | |
b7faa7aa G |
194 | /* |
195 | * Initialize the caller's dsl_pool_t structure before we actually open | |
196 | * the meta objset. This is done because a self-healing write zio may | |
197 | * be issued as part of dmu_objset_open_impl() and the spa needs its | |
198 | * dsl_pool_t initialized in order to handle the write. | |
199 | */ | |
200 | *dpp = dp; | |
201 | ||
9ae529ec CS |
202 | err = dmu_objset_open_impl(spa, NULL, &dp->dp_meta_rootbp, |
203 | &dp->dp_meta_objset); | |
b7faa7aa | 204 | if (err != 0) { |
9ae529ec | 205 | dsl_pool_close(dp); |
b7faa7aa G |
206 | *dpp = NULL; |
207 | } | |
9ae529ec CS |
208 | |
209 | return (err); | |
210 | } | |
211 | ||
212 | int | |
213 | dsl_pool_open(dsl_pool_t *dp) | |
214 | { | |
215 | int err; | |
b128c09f BB |
216 | dsl_dir_t *dd; |
217 | dsl_dataset_t *ds; | |
428870ff | 218 | uint64_t obj; |
34dc7c2f | 219 | |
13fe0198 | 220 | rrw_enter(&dp->dp_config_rwlock, RW_WRITER, FTAG); |
34dc7c2f BB |
221 | err = zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, |
222 | DMU_POOL_ROOT_DATASET, sizeof (uint64_t), 1, | |
223 | &dp->dp_root_dir_obj); | |
224 | if (err) | |
225 | goto out; | |
226 | ||
13fe0198 | 227 | err = dsl_dir_hold_obj(dp, dp->dp_root_dir_obj, |
34dc7c2f BB |
228 | NULL, dp, &dp->dp_root_dir); |
229 | if (err) | |
230 | goto out; | |
231 | ||
b128c09f | 232 | err = dsl_pool_open_special_dir(dp, MOS_DIR_NAME, &dp->dp_mos_dir); |
34dc7c2f BB |
233 | if (err) |
234 | goto out; | |
235 | ||
9ae529ec | 236 | if (spa_version(dp->dp_spa) >= SPA_VERSION_ORIGIN) { |
b128c09f BB |
237 | err = dsl_pool_open_special_dir(dp, ORIGIN_DIR_NAME, &dd); |
238 | if (err) | |
239 | goto out; | |
d683ddbb JG |
240 | err = dsl_dataset_hold_obj(dp, |
241 | dsl_dir_phys(dd)->dd_head_dataset_obj, FTAG, &ds); | |
9babb374 BB |
242 | if (err == 0) { |
243 | err = dsl_dataset_hold_obj(dp, | |
d683ddbb | 244 | dsl_dataset_phys(ds)->ds_prev_snap_obj, dp, |
9babb374 BB |
245 | &dp->dp_origin_snap); |
246 | dsl_dataset_rele(ds, FTAG); | |
247 | } | |
13fe0198 | 248 | dsl_dir_rele(dd, dp); |
b128c09f BB |
249 | if (err) |
250 | goto out; | |
b128c09f BB |
251 | } |
252 | ||
9ae529ec | 253 | if (spa_version(dp->dp_spa) >= SPA_VERSION_DEADLISTS) { |
428870ff BB |
254 | err = dsl_pool_open_special_dir(dp, FREE_DIR_NAME, |
255 | &dp->dp_free_dir); | |
b128c09f BB |
256 | if (err) |
257 | goto out; | |
428870ff | 258 | |
b128c09f | 259 | err = zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, |
428870ff | 260 | DMU_POOL_FREE_BPOBJ, sizeof (uint64_t), 1, &obj); |
b128c09f BB |
261 | if (err) |
262 | goto out; | |
13fe0198 | 263 | VERIFY0(bpobj_open(&dp->dp_free_bpobj, |
428870ff | 264 | dp->dp_meta_objset, obj)); |
b128c09f BB |
265 | } |
266 | ||
fbeddd60 MA |
267 | /* |
268 | * Note: errors ignored, because the leak dir will not exist if we | |
269 | * have not encountered a leak yet. | |
270 | */ | |
271 | (void) dsl_pool_open_special_dir(dp, LEAK_DIR_NAME, | |
272 | &dp->dp_leak_dir); | |
273 | ||
fa86b5db | 274 | if (spa_feature_is_active(dp->dp_spa, SPA_FEATURE_ASYNC_DESTROY)) { |
9ae529ec CS |
275 | err = zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, |
276 | DMU_POOL_BPTREE_OBJ, sizeof (uint64_t), 1, | |
277 | &dp->dp_bptree_obj); | |
278 | if (err != 0) | |
279 | goto out; | |
280 | } | |
281 | ||
fa86b5db | 282 | if (spa_feature_is_active(dp->dp_spa, SPA_FEATURE_EMPTY_BPOBJ)) { |
753c3839 MA |
283 | err = zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, |
284 | DMU_POOL_EMPTY_BPOBJ, sizeof (uint64_t), 1, | |
285 | &dp->dp_empty_bpobj); | |
286 | if (err != 0) | |
287 | goto out; | |
288 | } | |
289 | ||
428870ff BB |
290 | err = zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, |
291 | DMU_POOL_TMP_USERREFS, sizeof (uint64_t), 1, | |
292 | &dp->dp_tmp_userrefs_obj); | |
293 | if (err == ENOENT) | |
294 | err = 0; | |
295 | if (err) | |
296 | goto out; | |
297 | ||
9ae529ec | 298 | err = dsl_scan_init(dp, dp->dp_tx.tx_open_txg); |
428870ff | 299 | |
34dc7c2f | 300 | out: |
13fe0198 | 301 | rrw_exit(&dp->dp_config_rwlock, FTAG); |
34dc7c2f BB |
302 | return (err); |
303 | } | |
304 | ||
305 | void | |
306 | dsl_pool_close(dsl_pool_t *dp) | |
307 | { | |
b128c09f | 308 | /* |
e8b96c60 MA |
309 | * Drop our references from dsl_pool_open(). |
310 | * | |
b128c09f BB |
311 | * Since we held the origin_snap from "syncing" context (which |
312 | * includes pool-opening context), it actually only got a "ref" | |
313 | * and not a hold, so just drop that here. | |
314 | */ | |
315 | if (dp->dp_origin_snap) | |
13fe0198 | 316 | dsl_dataset_rele(dp->dp_origin_snap, dp); |
34dc7c2f | 317 | if (dp->dp_mos_dir) |
13fe0198 | 318 | dsl_dir_rele(dp->dp_mos_dir, dp); |
428870ff | 319 | if (dp->dp_free_dir) |
13fe0198 | 320 | dsl_dir_rele(dp->dp_free_dir, dp); |
fbeddd60 MA |
321 | if (dp->dp_leak_dir) |
322 | dsl_dir_rele(dp->dp_leak_dir, dp); | |
34dc7c2f | 323 | if (dp->dp_root_dir) |
13fe0198 | 324 | dsl_dir_rele(dp->dp_root_dir, dp); |
34dc7c2f | 325 | |
428870ff BB |
326 | bpobj_close(&dp->dp_free_bpobj); |
327 | ||
34dc7c2f BB |
328 | /* undo the dmu_objset_open_impl(mos) from dsl_pool_open() */ |
329 | if (dp->dp_meta_objset) | |
428870ff | 330 | dmu_objset_evict(dp->dp_meta_objset); |
34dc7c2f BB |
331 | |
332 | txg_list_destroy(&dp->dp_dirty_datasets); | |
29809a6c | 333 | txg_list_destroy(&dp->dp_dirty_zilogs); |
428870ff | 334 | txg_list_destroy(&dp->dp_sync_tasks); |
34dc7c2f | 335 | txg_list_destroy(&dp->dp_dirty_dirs); |
34dc7c2f | 336 | |
64fc7762 MA |
337 | taskq_destroy(dp->dp_sync_taskq); |
338 | ||
ca0bf58d PS |
339 | /* |
340 | * We can't set retry to TRUE since we're explicitly specifying | |
341 | * a spa to flush. This is good enough; any missed buffers for | |
342 | * this spa won't cause trouble, and they'll eventually fall | |
343 | * out of the ARC just like any other unused buffer. | |
344 | */ | |
345 | arc_flush(dp->dp_spa, FALSE); | |
346 | ||
379ca9cf | 347 | mmp_fini(dp->dp_spa); |
34dc7c2f | 348 | txg_fini(dp); |
428870ff | 349 | dsl_scan_fini(dp); |
0c66c32d JG |
350 | dmu_buf_user_evict_wait(); |
351 | ||
13fe0198 | 352 | rrw_destroy(&dp->dp_config_rwlock); |
34dc7c2f | 353 | mutex_destroy(&dp->dp_lock); |
c17486b2 | 354 | cv_destroy(&dp->dp_spaceavail_cv); |
3558fd73 | 355 | taskq_destroy(dp->dp_iput_taskq); |
b128c09f | 356 | if (dp->dp_blkstats) |
79c76d5b | 357 | vmem_free(dp->dp_blkstats, sizeof (zfs_all_blkstats_t)); |
34dc7c2f BB |
358 | kmem_free(dp, sizeof (dsl_pool_t)); |
359 | } | |
360 | ||
361 | dsl_pool_t * | |
b128c09f | 362 | dsl_pool_create(spa_t *spa, nvlist_t *zplprops, uint64_t txg) |
34dc7c2f BB |
363 | { |
364 | int err; | |
365 | dsl_pool_t *dp = dsl_pool_open_impl(spa, txg); | |
366 | dmu_tx_t *tx = dmu_tx_create_assigned(dp, txg); | |
428870ff | 367 | objset_t *os; |
b128c09f | 368 | dsl_dataset_t *ds; |
428870ff | 369 | uint64_t obj; |
b128c09f | 370 | |
13fe0198 MA |
371 | rrw_enter(&dp->dp_config_rwlock, RW_WRITER, FTAG); |
372 | ||
b128c09f | 373 | /* create and open the MOS (meta-objset) */ |
428870ff BB |
374 | dp->dp_meta_objset = dmu_objset_create_impl(spa, |
375 | NULL, &dp->dp_meta_rootbp, DMU_OST_META, tx); | |
34dc7c2f BB |
376 | |
377 | /* create the pool directory */ | |
378 | err = zap_create_claim(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, | |
379 | DMU_OT_OBJECT_DIRECTORY, DMU_OT_NONE, 0, tx); | |
c99c9001 | 380 | ASSERT0(err); |
34dc7c2f | 381 | |
428870ff | 382 | /* Initialize scan structures */ |
13fe0198 | 383 | VERIFY0(dsl_scan_init(dp, txg)); |
428870ff | 384 | |
34dc7c2f | 385 | /* create and open the root dir */ |
b128c09f | 386 | dp->dp_root_dir_obj = dsl_dir_create_sync(dp, NULL, NULL, tx); |
13fe0198 | 387 | VERIFY0(dsl_dir_hold_obj(dp, dp->dp_root_dir_obj, |
34dc7c2f BB |
388 | NULL, dp, &dp->dp_root_dir)); |
389 | ||
390 | /* create and open the meta-objset dir */ | |
b128c09f | 391 | (void) dsl_dir_create_sync(dp, dp->dp_root_dir, MOS_DIR_NAME, tx); |
13fe0198 | 392 | VERIFY0(dsl_pool_open_special_dir(dp, |
b128c09f BB |
393 | MOS_DIR_NAME, &dp->dp_mos_dir)); |
394 | ||
428870ff BB |
395 | if (spa_version(spa) >= SPA_VERSION_DEADLISTS) { |
396 | /* create and open the free dir */ | |
397 | (void) dsl_dir_create_sync(dp, dp->dp_root_dir, | |
398 | FREE_DIR_NAME, tx); | |
13fe0198 | 399 | VERIFY0(dsl_pool_open_special_dir(dp, |
428870ff BB |
400 | FREE_DIR_NAME, &dp->dp_free_dir)); |
401 | ||
402 | /* create and open the free_bplist */ | |
f1512ee6 | 403 | obj = bpobj_alloc(dp->dp_meta_objset, SPA_OLD_MAXBLOCKSIZE, tx); |
428870ff BB |
404 | VERIFY(zap_add(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, |
405 | DMU_POOL_FREE_BPOBJ, sizeof (uint64_t), 1, &obj, tx) == 0); | |
13fe0198 | 406 | VERIFY0(bpobj_open(&dp->dp_free_bpobj, |
428870ff BB |
407 | dp->dp_meta_objset, obj)); |
408 | } | |
409 | ||
b128c09f BB |
410 | if (spa_version(spa) >= SPA_VERSION_DSL_SCRUB) |
411 | dsl_pool_create_origin(dp, tx); | |
412 | ||
413 | /* create the root dataset */ | |
428870ff | 414 | obj = dsl_dataset_create_sync_dd(dp->dp_root_dir, NULL, 0, tx); |
b128c09f BB |
415 | |
416 | /* create the root objset */ | |
13fe0198 | 417 | VERIFY0(dsl_dataset_hold_obj(dp, obj, FTAG, &ds)); |
cc9bb3e5 | 418 | rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG); |
0fe3d820 BB |
419 | VERIFY(NULL != (os = dmu_objset_create_impl(dp->dp_spa, ds, |
420 | dsl_dataset_get_blkptr(ds), DMU_OST_ZFS, tx))); | |
cc9bb3e5 | 421 | rrw_exit(&ds->ds_bp_rwlock, FTAG); |
b128c09f | 422 | #ifdef _KERNEL |
428870ff | 423 | zfs_create_fs(os, kcred, zplprops, tx); |
b128c09f BB |
424 | #endif |
425 | dsl_dataset_rele(ds, FTAG); | |
34dc7c2f BB |
426 | |
427 | dmu_tx_commit(tx); | |
428 | ||
13fe0198 MA |
429 | rrw_exit(&dp->dp_config_rwlock, FTAG); |
430 | ||
34dc7c2f BB |
431 | return (dp); |
432 | } | |
433 | ||
29809a6c MA |
434 | /* |
435 | * Account for the meta-objset space in its placeholder dsl_dir. | |
436 | */ | |
437 | void | |
438 | dsl_pool_mos_diduse_space(dsl_pool_t *dp, | |
439 | int64_t used, int64_t comp, int64_t uncomp) | |
440 | { | |
441 | ASSERT3U(comp, ==, uncomp); /* it's all metadata */ | |
442 | mutex_enter(&dp->dp_lock); | |
443 | dp->dp_mos_used_delta += used; | |
444 | dp->dp_mos_compressed_delta += comp; | |
445 | dp->dp_mos_uncompressed_delta += uncomp; | |
446 | mutex_exit(&dp->dp_lock); | |
447 | } | |
448 | ||
e8b96c60 MA |
449 | static void |
450 | dsl_pool_sync_mos(dsl_pool_t *dp, dmu_tx_t *tx) | |
451 | { | |
452 | zio_t *zio = zio_root(dp->dp_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED); | |
453 | dmu_objset_sync(dp->dp_meta_objset, zio, tx); | |
454 | VERIFY0(zio_wait(zio)); | |
455 | dprintf_bp(&dp->dp_meta_rootbp, "meta objset rootbp is %s", ""); | |
456 | spa_set_rootblkptr(dp->dp_spa, &dp->dp_meta_rootbp); | |
457 | } | |
458 | ||
459 | static void | |
460 | dsl_pool_dirty_delta(dsl_pool_t *dp, int64_t delta) | |
461 | { | |
462 | ASSERT(MUTEX_HELD(&dp->dp_lock)); | |
463 | ||
464 | if (delta < 0) | |
465 | ASSERT3U(-delta, <=, dp->dp_dirty_total); | |
466 | ||
467 | dp->dp_dirty_total += delta; | |
468 | ||
469 | /* | |
470 | * Note: we signal even when increasing dp_dirty_total. | |
471 | * This ensures forward progress -- each thread wakes the next waiter. | |
472 | */ | |
c0c8cc7b | 473 | if (dp->dp_dirty_total < zfs_dirty_data_max) |
e8b96c60 MA |
474 | cv_signal(&dp->dp_spaceavail_cv); |
475 | } | |
476 | ||
34dc7c2f BB |
477 | void |
478 | dsl_pool_sync(dsl_pool_t *dp, uint64_t txg) | |
479 | { | |
480 | zio_t *zio; | |
481 | dmu_tx_t *tx; | |
482 | dsl_dir_t *dd; | |
483 | dsl_dataset_t *ds; | |
428870ff | 484 | objset_t *mos = dp->dp_meta_objset; |
29809a6c MA |
485 | list_t synced_datasets; |
486 | ||
487 | list_create(&synced_datasets, sizeof (dsl_dataset_t), | |
488 | offsetof(dsl_dataset_t, ds_synced_link)); | |
34dc7c2f BB |
489 | |
490 | tx = dmu_tx_create_assigned(dp, txg); | |
491 | ||
e8b96c60 MA |
492 | /* |
493 | * Write out all dirty blocks of dirty datasets. | |
494 | */ | |
34dc7c2f | 495 | zio = zio_root(dp->dp_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED); |
e8b96c60 | 496 | while ((ds = txg_list_remove(&dp->dp_dirty_datasets, txg)) != NULL) { |
9babb374 BB |
497 | /* |
498 | * We must not sync any non-MOS datasets twice, because | |
499 | * we may have taken a snapshot of them. However, we | |
500 | * may sync newly-created datasets on pass 2. | |
501 | */ | |
502 | ASSERT(!list_link_active(&ds->ds_synced_link)); | |
29809a6c | 503 | list_insert_tail(&synced_datasets, ds); |
34dc7c2f BB |
504 | dsl_dataset_sync(ds, zio, tx); |
505 | } | |
e8b96c60 | 506 | VERIFY0(zio_wait(zio)); |
9babb374 | 507 | |
e8b96c60 MA |
508 | /* |
509 | * We have written all of the accounted dirty data, so our | |
510 | * dp_space_towrite should now be zero. However, some seldom-used | |
511 | * code paths do not adhere to this (e.g. dbuf_undirty(), also | |
512 | * rounding error in dbuf_write_physdone). | |
513 | * Shore up the accounting of any dirtied space now. | |
514 | */ | |
515 | dsl_pool_undirty_space(dp, dp->dp_dirty_pertxg[txg & TXG_MASK], txg); | |
34dc7c2f | 516 | |
539d33c7 GM |
517 | /* |
518 | * Update the long range free counter after | |
519 | * we're done syncing user data | |
520 | */ | |
521 | mutex_enter(&dp->dp_lock); | |
522 | ASSERT(spa_sync_pass(dp->dp_spa) == 1 || | |
523 | dp->dp_long_free_dirty_pertxg[txg & TXG_MASK] == 0); | |
524 | dp->dp_long_free_dirty_pertxg[txg & TXG_MASK] = 0; | |
525 | mutex_exit(&dp->dp_lock); | |
526 | ||
29809a6c MA |
527 | /* |
528 | * After the data blocks have been written (ensured by the zio_wait() | |
64fc7762 MA |
529 | * above), update the user/group space accounting. This happens |
530 | * in tasks dispatched to dp_sync_taskq, so wait for them before | |
531 | * continuing. | |
29809a6c | 532 | */ |
e8b96c60 MA |
533 | for (ds = list_head(&synced_datasets); ds != NULL; |
534 | ds = list_next(&synced_datasets, ds)) { | |
428870ff | 535 | dmu_objset_do_userquota_updates(ds->ds_objset, tx); |
e8b96c60 | 536 | } |
64fc7762 | 537 | taskq_wait(dp->dp_sync_taskq); |
9babb374 BB |
538 | |
539 | /* | |
540 | * Sync the datasets again to push out the changes due to | |
428870ff | 541 | * userspace updates. This must be done before we process the |
29809a6c MA |
542 | * sync tasks, so that any snapshots will have the correct |
543 | * user accounting information (and we won't get confused | |
544 | * about which blocks are part of the snapshot). | |
9babb374 BB |
545 | */ |
546 | zio = zio_root(dp->dp_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED); | |
e8b96c60 | 547 | while ((ds = txg_list_remove(&dp->dp_dirty_datasets, txg)) != NULL) { |
9babb374 BB |
548 | ASSERT(list_link_active(&ds->ds_synced_link)); |
549 | dmu_buf_rele(ds->ds_dbuf, ds); | |
550 | dsl_dataset_sync(ds, zio, tx); | |
551 | } | |
e8b96c60 | 552 | VERIFY0(zio_wait(zio)); |
9babb374 | 553 | |
428870ff | 554 | /* |
29809a6c MA |
555 | * Now that the datasets have been completely synced, we can |
556 | * clean up our in-memory structures accumulated while syncing: | |
557 | * | |
558 | * - move dead blocks from the pending deadlist to the on-disk deadlist | |
29809a6c | 559 | * - release hold from dsl_dataset_dirty() |
428870ff | 560 | */ |
e8b96c60 | 561 | while ((ds = list_remove_head(&synced_datasets)) != NULL) { |
0efd9791 | 562 | dsl_dataset_sync_done(ds, tx); |
428870ff BB |
563 | } |
564 | ||
e8b96c60 | 565 | while ((dd = txg_list_remove(&dp->dp_dirty_dirs, txg)) != NULL) { |
34dc7c2f | 566 | dsl_dir_sync(dd, tx); |
e8b96c60 | 567 | } |
b128c09f | 568 | |
29809a6c MA |
569 | /* |
570 | * The MOS's space is accounted for in the pool/$MOS | |
571 | * (dp_mos_dir). We can't modify the mos while we're syncing | |
572 | * it, so we remember the deltas and apply them here. | |
573 | */ | |
574 | if (dp->dp_mos_used_delta != 0 || dp->dp_mos_compressed_delta != 0 || | |
575 | dp->dp_mos_uncompressed_delta != 0) { | |
576 | dsl_dir_diduse_space(dp->dp_mos_dir, DD_USED_HEAD, | |
577 | dp->dp_mos_used_delta, | |
578 | dp->dp_mos_compressed_delta, | |
579 | dp->dp_mos_uncompressed_delta, tx); | |
580 | dp->dp_mos_used_delta = 0; | |
581 | dp->dp_mos_compressed_delta = 0; | |
582 | dp->dp_mos_uncompressed_delta = 0; | |
583 | } | |
584 | ||
64fc7762 | 585 | if (!multilist_is_empty(mos->os_dirty_dnodes[txg & TXG_MASK])) { |
e8b96c60 | 586 | dsl_pool_sync_mos(dp, tx); |
34dc7c2f BB |
587 | } |
588 | ||
29809a6c MA |
589 | /* |
590 | * If we modify a dataset in the same txg that we want to destroy it, | |
591 | * its dsl_dir's dd_dbuf will be dirty, and thus have a hold on it. | |
592 | * dsl_dir_destroy_check() will fail if there are unexpected holds. | |
593 | * Therefore, we want to sync the MOS (thus syncing the dd_dbuf | |
594 | * and clearing the hold on it) before we process the sync_tasks. | |
595 | * The MOS data dirtied by the sync_tasks will be synced on the next | |
596 | * pass. | |
597 | */ | |
29809a6c | 598 | if (!txg_list_empty(&dp->dp_sync_tasks, txg)) { |
13fe0198 | 599 | dsl_sync_task_t *dst; |
29809a6c MA |
600 | /* |
601 | * No more sync tasks should have been added while we | |
602 | * were syncing. | |
603 | */ | |
e8b96c60 MA |
604 | ASSERT3U(spa_sync_pass(dp->dp_spa), ==, 1); |
605 | while ((dst = txg_list_remove(&dp->dp_sync_tasks, txg)) != NULL) | |
13fe0198 | 606 | dsl_sync_task_sync(dst, tx); |
29809a6c MA |
607 | } |
608 | ||
34dc7c2f | 609 | dmu_tx_commit(tx); |
b128c09f | 610 | |
e8b96c60 | 611 | DTRACE_PROBE2(dsl_pool_sync__done, dsl_pool_t *dp, dp, uint64_t, txg); |
34dc7c2f BB |
612 | } |
613 | ||
614 | void | |
428870ff | 615 | dsl_pool_sync_done(dsl_pool_t *dp, uint64_t txg) |
34dc7c2f | 616 | { |
29809a6c | 617 | zilog_t *zilog; |
34dc7c2f | 618 | |
55922e73 | 619 | while ((zilog = txg_list_head(&dp->dp_dirty_zilogs, txg))) { |
e8b96c60 | 620 | dsl_dataset_t *ds = dmu_objset_ds(zilog->zl_os); |
55922e73 GW |
621 | /* |
622 | * We don't remove the zilog from the dp_dirty_zilogs | |
623 | * list until after we've cleaned it. This ensures that | |
624 | * callers of zilog_is_dirty() receive an accurate | |
625 | * answer when they are racing with the spa sync thread. | |
626 | */ | |
29809a6c | 627 | zil_clean(zilog, txg); |
55922e73 | 628 | (void) txg_list_remove_this(&dp->dp_dirty_zilogs, zilog, txg); |
29809a6c MA |
629 | ASSERT(!dmu_objset_is_dirty(zilog->zl_os, txg)); |
630 | dmu_buf_rele(ds->ds_dbuf, zilog); | |
34dc7c2f | 631 | } |
428870ff | 632 | ASSERT(!dmu_objset_is_dirty(dp->dp_meta_objset, txg)); |
34dc7c2f BB |
633 | } |
634 | ||
635 | /* | |
636 | * TRUE if the current thread is the tx_sync_thread or if we | |
637 | * are being called from SPA context during pool initialization. | |
638 | */ | |
639 | int | |
640 | dsl_pool_sync_context(dsl_pool_t *dp) | |
641 | { | |
642 | return (curthread == dp->dp_tx.tx_sync_thread || | |
64fc7762 MA |
643 | spa_is_initializing(dp->dp_spa) || |
644 | taskq_member(dp->dp_sync_taskq, curthread)); | |
34dc7c2f BB |
645 | } |
646 | ||
647 | uint64_t | |
648 | dsl_pool_adjustedsize(dsl_pool_t *dp, boolean_t netfree) | |
649 | { | |
650 | uint64_t space, resv; | |
651 | ||
652 | /* | |
34dc7c2f BB |
653 | * If we're trying to assess whether it's OK to do a free, |
654 | * cut the reservation in half to allow forward progress | |
655 | * (e.g. make it possible to rm(1) files from a full pool). | |
656 | */ | |
657 | space = spa_get_dspace(dp->dp_spa); | |
0c60cc32 | 658 | resv = spa_get_slop_space(dp->dp_spa); |
34dc7c2f BB |
659 | if (netfree) |
660 | resv >>= 1; | |
661 | ||
662 | return (space - resv); | |
663 | } | |
664 | ||
e8b96c60 MA |
665 | boolean_t |
666 | dsl_pool_need_dirty_delay(dsl_pool_t *dp) | |
34dc7c2f | 667 | { |
e8b96c60 MA |
668 | uint64_t delay_min_bytes = |
669 | zfs_dirty_data_max * zfs_delay_min_dirty_percent / 100; | |
670 | boolean_t rv; | |
34dc7c2f | 671 | |
e8b96c60 MA |
672 | mutex_enter(&dp->dp_lock); |
673 | if (dp->dp_dirty_total > zfs_dirty_data_sync) | |
674 | txg_kick(dp); | |
675 | rv = (dp->dp_dirty_total > delay_min_bytes); | |
676 | mutex_exit(&dp->dp_lock); | |
677 | return (rv); | |
34dc7c2f BB |
678 | } |
679 | ||
680 | void | |
e8b96c60 | 681 | dsl_pool_dirty_space(dsl_pool_t *dp, int64_t space, dmu_tx_t *tx) |
34dc7c2f | 682 | { |
e8b96c60 MA |
683 | if (space > 0) { |
684 | mutex_enter(&dp->dp_lock); | |
685 | dp->dp_dirty_pertxg[tx->tx_txg & TXG_MASK] += space; | |
686 | dsl_pool_dirty_delta(dp, space); | |
687 | mutex_exit(&dp->dp_lock); | |
688 | } | |
34dc7c2f BB |
689 | } |
690 | ||
691 | void | |
e8b96c60 | 692 | dsl_pool_undirty_space(dsl_pool_t *dp, int64_t space, uint64_t txg) |
34dc7c2f | 693 | { |
e8b96c60 MA |
694 | ASSERT3S(space, >=, 0); |
695 | if (space == 0) | |
34dc7c2f BB |
696 | return; |
697 | ||
e8b96c60 MA |
698 | mutex_enter(&dp->dp_lock); |
699 | if (dp->dp_dirty_pertxg[txg & TXG_MASK] < space) { | |
700 | /* XXX writing something we didn't dirty? */ | |
701 | space = dp->dp_dirty_pertxg[txg & TXG_MASK]; | |
34dc7c2f | 702 | } |
e8b96c60 MA |
703 | ASSERT3U(dp->dp_dirty_pertxg[txg & TXG_MASK], >=, space); |
704 | dp->dp_dirty_pertxg[txg & TXG_MASK] -= space; | |
705 | ASSERT3U(dp->dp_dirty_total, >=, space); | |
706 | dsl_pool_dirty_delta(dp, -space); | |
707 | mutex_exit(&dp->dp_lock); | |
34dc7c2f | 708 | } |
b128c09f BB |
709 | |
710 | /* ARGSUSED */ | |
711 | static int | |
13fe0198 | 712 | upgrade_clones_cb(dsl_pool_t *dp, dsl_dataset_t *hds, void *arg) |
b128c09f BB |
713 | { |
714 | dmu_tx_t *tx = arg; | |
715 | dsl_dataset_t *ds, *prev = NULL; | |
716 | int err; | |
b128c09f | 717 | |
13fe0198 | 718 | err = dsl_dataset_hold_obj(dp, hds->ds_object, FTAG, &ds); |
b128c09f BB |
719 | if (err) |
720 | return (err); | |
721 | ||
d683ddbb JG |
722 | while (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) { |
723 | err = dsl_dataset_hold_obj(dp, | |
724 | dsl_dataset_phys(ds)->ds_prev_snap_obj, FTAG, &prev); | |
b128c09f BB |
725 | if (err) { |
726 | dsl_dataset_rele(ds, FTAG); | |
727 | return (err); | |
728 | } | |
729 | ||
d683ddbb | 730 | if (dsl_dataset_phys(prev)->ds_next_snap_obj != ds->ds_object) |
b128c09f BB |
731 | break; |
732 | dsl_dataset_rele(ds, FTAG); | |
733 | ds = prev; | |
734 | prev = NULL; | |
735 | } | |
736 | ||
737 | if (prev == NULL) { | |
738 | prev = dp->dp_origin_snap; | |
739 | ||
740 | /* | |
741 | * The $ORIGIN can't have any data, or the accounting | |
742 | * will be wrong. | |
743 | */ | |
cc9bb3e5 | 744 | rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG); |
d683ddbb | 745 | ASSERT0(dsl_dataset_phys(prev)->ds_bp.blk_birth); |
cc9bb3e5 | 746 | rrw_exit(&ds->ds_bp_rwlock, FTAG); |
b128c09f BB |
747 | |
748 | /* The origin doesn't get attached to itself */ | |
749 | if (ds->ds_object == prev->ds_object) { | |
750 | dsl_dataset_rele(ds, FTAG); | |
751 | return (0); | |
752 | } | |
753 | ||
754 | dmu_buf_will_dirty(ds->ds_dbuf, tx); | |
d683ddbb JG |
755 | dsl_dataset_phys(ds)->ds_prev_snap_obj = prev->ds_object; |
756 | dsl_dataset_phys(ds)->ds_prev_snap_txg = | |
757 | dsl_dataset_phys(prev)->ds_creation_txg; | |
b128c09f BB |
758 | |
759 | dmu_buf_will_dirty(ds->ds_dir->dd_dbuf, tx); | |
d683ddbb | 760 | dsl_dir_phys(ds->ds_dir)->dd_origin_obj = prev->ds_object; |
b128c09f BB |
761 | |
762 | dmu_buf_will_dirty(prev->ds_dbuf, tx); | |
d683ddbb | 763 | dsl_dataset_phys(prev)->ds_num_children++; |
b128c09f | 764 | |
d683ddbb | 765 | if (dsl_dataset_phys(ds)->ds_next_snap_obj == 0) { |
b128c09f | 766 | ASSERT(ds->ds_prev == NULL); |
13fe0198 | 767 | VERIFY0(dsl_dataset_hold_obj(dp, |
d683ddbb JG |
768 | dsl_dataset_phys(ds)->ds_prev_snap_obj, |
769 | ds, &ds->ds_prev)); | |
b128c09f BB |
770 | } |
771 | } | |
772 | ||
d683ddbb JG |
773 | ASSERT3U(dsl_dir_phys(ds->ds_dir)->dd_origin_obj, ==, prev->ds_object); |
774 | ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_obj, ==, prev->ds_object); | |
b128c09f | 775 | |
d683ddbb | 776 | if (dsl_dataset_phys(prev)->ds_next_clones_obj == 0) { |
428870ff | 777 | dmu_buf_will_dirty(prev->ds_dbuf, tx); |
d683ddbb | 778 | dsl_dataset_phys(prev)->ds_next_clones_obj = |
b128c09f BB |
779 | zap_create(dp->dp_meta_objset, |
780 | DMU_OT_NEXT_CLONES, DMU_OT_NONE, 0, tx); | |
781 | } | |
13fe0198 | 782 | VERIFY0(zap_add_int(dp->dp_meta_objset, |
d683ddbb | 783 | dsl_dataset_phys(prev)->ds_next_clones_obj, ds->ds_object, tx)); |
b128c09f BB |
784 | |
785 | dsl_dataset_rele(ds, FTAG); | |
786 | if (prev != dp->dp_origin_snap) | |
787 | dsl_dataset_rele(prev, FTAG); | |
788 | return (0); | |
789 | } | |
790 | ||
791 | void | |
792 | dsl_pool_upgrade_clones(dsl_pool_t *dp, dmu_tx_t *tx) | |
793 | { | |
794 | ASSERT(dmu_tx_is_syncing(tx)); | |
795 | ASSERT(dp->dp_origin_snap != NULL); | |
796 | ||
13fe0198 | 797 | VERIFY0(dmu_objset_find_dp(dp, dp->dp_root_dir_obj, upgrade_clones_cb, |
9c43027b | 798 | tx, DS_FIND_CHILDREN | DS_FIND_SERIALIZE)); |
428870ff BB |
799 | } |
800 | ||
801 | /* ARGSUSED */ | |
802 | static int | |
13fe0198 | 803 | upgrade_dir_clones_cb(dsl_pool_t *dp, dsl_dataset_t *ds, void *arg) |
428870ff BB |
804 | { |
805 | dmu_tx_t *tx = arg; | |
428870ff BB |
806 | objset_t *mos = dp->dp_meta_objset; |
807 | ||
d683ddbb | 808 | if (dsl_dir_phys(ds->ds_dir)->dd_origin_obj != 0) { |
428870ff BB |
809 | dsl_dataset_t *origin; |
810 | ||
13fe0198 | 811 | VERIFY0(dsl_dataset_hold_obj(dp, |
d683ddbb | 812 | dsl_dir_phys(ds->ds_dir)->dd_origin_obj, FTAG, &origin)); |
428870ff | 813 | |
d683ddbb | 814 | if (dsl_dir_phys(origin->ds_dir)->dd_clones == 0) { |
428870ff | 815 | dmu_buf_will_dirty(origin->ds_dir->dd_dbuf, tx); |
d683ddbb JG |
816 | dsl_dir_phys(origin->ds_dir)->dd_clones = |
817 | zap_create(mos, DMU_OT_DSL_CLONES, DMU_OT_NONE, | |
818 | 0, tx); | |
428870ff BB |
819 | } |
820 | ||
13fe0198 | 821 | VERIFY0(zap_add_int(dp->dp_meta_objset, |
d683ddbb JG |
822 | dsl_dir_phys(origin->ds_dir)->dd_clones, |
823 | ds->ds_object, tx)); | |
428870ff BB |
824 | |
825 | dsl_dataset_rele(origin, FTAG); | |
826 | } | |
428870ff BB |
827 | return (0); |
828 | } | |
829 | ||
830 | void | |
831 | dsl_pool_upgrade_dir_clones(dsl_pool_t *dp, dmu_tx_t *tx) | |
832 | { | |
428870ff BB |
833 | uint64_t obj; |
834 | ||
d6320ddb BB |
835 | ASSERT(dmu_tx_is_syncing(tx)); |
836 | ||
428870ff | 837 | (void) dsl_dir_create_sync(dp, dp->dp_root_dir, FREE_DIR_NAME, tx); |
13fe0198 | 838 | VERIFY0(dsl_pool_open_special_dir(dp, |
428870ff BB |
839 | FREE_DIR_NAME, &dp->dp_free_dir)); |
840 | ||
841 | /* | |
842 | * We can't use bpobj_alloc(), because spa_version() still | |
843 | * returns the old version, and we need a new-version bpobj with | |
844 | * subobj support. So call dmu_object_alloc() directly. | |
845 | */ | |
846 | obj = dmu_object_alloc(dp->dp_meta_objset, DMU_OT_BPOBJ, | |
f1512ee6 | 847 | SPA_OLD_MAXBLOCKSIZE, DMU_OT_BPOBJ_HDR, sizeof (bpobj_phys_t), tx); |
13fe0198 | 848 | VERIFY0(zap_add(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, |
428870ff | 849 | DMU_POOL_FREE_BPOBJ, sizeof (uint64_t), 1, &obj, tx)); |
13fe0198 | 850 | VERIFY0(bpobj_open(&dp->dp_free_bpobj, dp->dp_meta_objset, obj)); |
428870ff | 851 | |
13fe0198 | 852 | VERIFY0(dmu_objset_find_dp(dp, dp->dp_root_dir_obj, |
9c43027b | 853 | upgrade_dir_clones_cb, tx, DS_FIND_CHILDREN | DS_FIND_SERIALIZE)); |
b128c09f BB |
854 | } |
855 | ||
856 | void | |
857 | dsl_pool_create_origin(dsl_pool_t *dp, dmu_tx_t *tx) | |
858 | { | |
859 | uint64_t dsobj; | |
860 | dsl_dataset_t *ds; | |
861 | ||
862 | ASSERT(dmu_tx_is_syncing(tx)); | |
863 | ASSERT(dp->dp_origin_snap == NULL); | |
13fe0198 | 864 | ASSERT(rrw_held(&dp->dp_config_rwlock, RW_WRITER)); |
b128c09f BB |
865 | |
866 | /* create the origin dir, ds, & snap-ds */ | |
b128c09f BB |
867 | dsobj = dsl_dataset_create_sync(dp->dp_root_dir, ORIGIN_DIR_NAME, |
868 | NULL, 0, kcred, tx); | |
13fe0198 MA |
869 | VERIFY0(dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds)); |
870 | dsl_dataset_snapshot_sync_impl(ds, ORIGIN_DIR_NAME, tx); | |
d683ddbb | 871 | VERIFY0(dsl_dataset_hold_obj(dp, dsl_dataset_phys(ds)->ds_prev_snap_obj, |
b128c09f BB |
872 | dp, &dp->dp_origin_snap)); |
873 | dsl_dataset_rele(ds, FTAG); | |
b128c09f | 874 | } |
9babb374 BB |
875 | |
876 | taskq_t * | |
3558fd73 | 877 | dsl_pool_iput_taskq(dsl_pool_t *dp) |
9babb374 | 878 | { |
3558fd73 | 879 | return (dp->dp_iput_taskq); |
9babb374 | 880 | } |
428870ff BB |
881 | |
882 | /* | |
883 | * Walk through the pool-wide zap object of temporary snapshot user holds | |
884 | * and release them. | |
885 | */ | |
886 | void | |
887 | dsl_pool_clean_tmp_userrefs(dsl_pool_t *dp) | |
888 | { | |
889 | zap_attribute_t za; | |
890 | zap_cursor_t zc; | |
891 | objset_t *mos = dp->dp_meta_objset; | |
892 | uint64_t zapobj = dp->dp_tmp_userrefs_obj; | |
95fd54a1 | 893 | nvlist_t *holds; |
428870ff BB |
894 | |
895 | if (zapobj == 0) | |
896 | return; | |
897 | ASSERT(spa_version(dp->dp_spa) >= SPA_VERSION_USERREFS); | |
898 | ||
95fd54a1 SH |
899 | holds = fnvlist_alloc(); |
900 | ||
428870ff BB |
901 | for (zap_cursor_init(&zc, mos, zapobj); |
902 | zap_cursor_retrieve(&zc, &za) == 0; | |
903 | zap_cursor_advance(&zc)) { | |
904 | char *htag; | |
95fd54a1 | 905 | nvlist_t *tags; |
428870ff BB |
906 | |
907 | htag = strchr(za.za_name, '-'); | |
908 | *htag = '\0'; | |
909 | ++htag; | |
95fd54a1 SH |
910 | if (nvlist_lookup_nvlist(holds, za.za_name, &tags) != 0) { |
911 | tags = fnvlist_alloc(); | |
912 | fnvlist_add_boolean(tags, htag); | |
913 | fnvlist_add_nvlist(holds, za.za_name, tags); | |
914 | fnvlist_free(tags); | |
915 | } else { | |
916 | fnvlist_add_boolean(tags, htag); | |
917 | } | |
428870ff | 918 | } |
95fd54a1 SH |
919 | dsl_dataset_user_release_tmp(dp, holds); |
920 | fnvlist_free(holds); | |
428870ff BB |
921 | zap_cursor_fini(&zc); |
922 | } | |
923 | ||
924 | /* | |
925 | * Create the pool-wide zap object for storing temporary snapshot holds. | |
926 | */ | |
927 | void | |
928 | dsl_pool_user_hold_create_obj(dsl_pool_t *dp, dmu_tx_t *tx) | |
929 | { | |
930 | objset_t *mos = dp->dp_meta_objset; | |
931 | ||
932 | ASSERT(dp->dp_tmp_userrefs_obj == 0); | |
933 | ASSERT(dmu_tx_is_syncing(tx)); | |
934 | ||
9ae529ec CS |
935 | dp->dp_tmp_userrefs_obj = zap_create_link(mos, DMU_OT_USERREFS, |
936 | DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_TMP_USERREFS, tx); | |
428870ff BB |
937 | } |
938 | ||
939 | static int | |
940 | dsl_pool_user_hold_rele_impl(dsl_pool_t *dp, uint64_t dsobj, | |
13fe0198 | 941 | const char *tag, uint64_t now, dmu_tx_t *tx, boolean_t holding) |
428870ff BB |
942 | { |
943 | objset_t *mos = dp->dp_meta_objset; | |
944 | uint64_t zapobj = dp->dp_tmp_userrefs_obj; | |
945 | char *name; | |
946 | int error; | |
947 | ||
948 | ASSERT(spa_version(dp->dp_spa) >= SPA_VERSION_USERREFS); | |
949 | ASSERT(dmu_tx_is_syncing(tx)); | |
950 | ||
951 | /* | |
952 | * If the pool was created prior to SPA_VERSION_USERREFS, the | |
953 | * zap object for temporary holds might not exist yet. | |
954 | */ | |
955 | if (zapobj == 0) { | |
956 | if (holding) { | |
957 | dsl_pool_user_hold_create_obj(dp, tx); | |
958 | zapobj = dp->dp_tmp_userrefs_obj; | |
959 | } else { | |
2e528b49 | 960 | return (SET_ERROR(ENOENT)); |
428870ff BB |
961 | } |
962 | } | |
963 | ||
964 | name = kmem_asprintf("%llx-%s", (u_longlong_t)dsobj, tag); | |
965 | if (holding) | |
13fe0198 | 966 | error = zap_add(mos, zapobj, name, 8, 1, &now, tx); |
428870ff BB |
967 | else |
968 | error = zap_remove(mos, zapobj, name, tx); | |
969 | strfree(name); | |
970 | ||
971 | return (error); | |
972 | } | |
973 | ||
974 | /* | |
975 | * Add a temporary hold for the given dataset object and tag. | |
976 | */ | |
977 | int | |
978 | dsl_pool_user_hold(dsl_pool_t *dp, uint64_t dsobj, const char *tag, | |
13fe0198 | 979 | uint64_t now, dmu_tx_t *tx) |
428870ff BB |
980 | { |
981 | return (dsl_pool_user_hold_rele_impl(dp, dsobj, tag, now, tx, B_TRUE)); | |
982 | } | |
983 | ||
984 | /* | |
985 | * Release a temporary hold for the given dataset object and tag. | |
986 | */ | |
987 | int | |
988 | dsl_pool_user_release(dsl_pool_t *dp, uint64_t dsobj, const char *tag, | |
989 | dmu_tx_t *tx) | |
990 | { | |
13fe0198 | 991 | return (dsl_pool_user_hold_rele_impl(dp, dsobj, tag, 0, |
428870ff BB |
992 | tx, B_FALSE)); |
993 | } | |
c409e464 | 994 | |
13fe0198 MA |
995 | /* |
996 | * DSL Pool Configuration Lock | |
997 | * | |
998 | * The dp_config_rwlock protects against changes to DSL state (e.g. dataset | |
999 | * creation / destruction / rename / property setting). It must be held for | |
1000 | * read to hold a dataset or dsl_dir. I.e. you must call | |
1001 | * dsl_pool_config_enter() or dsl_pool_hold() before calling | |
1002 | * dsl_{dataset,dir}_hold{_obj}. In most circumstances, the dp_config_rwlock | |
1003 | * must be held continuously until all datasets and dsl_dirs are released. | |
1004 | * | |
1005 | * The only exception to this rule is that if a "long hold" is placed on | |
1006 | * a dataset, then the dp_config_rwlock may be dropped while the dataset | |
1007 | * is still held. The long hold will prevent the dataset from being | |
1008 | * destroyed -- the destroy will fail with EBUSY. A long hold can be | |
1009 | * obtained by calling dsl_dataset_long_hold(), or by "owning" a dataset | |
1010 | * (by calling dsl_{dataset,objset}_{try}own{_obj}). | |
1011 | * | |
1012 | * Legitimate long-holders (including owners) should be long-running, cancelable | |
1013 | * tasks that should cause "zfs destroy" to fail. This includes DMU | |
1014 | * consumers (i.e. a ZPL filesystem being mounted or ZVOL being open), | |
1015 | * "zfs send", and "zfs diff". There are several other long-holders whose | |
1016 | * uses are suboptimal (e.g. "zfs promote", and zil_suspend()). | |
1017 | * | |
1018 | * The usual formula for long-holding would be: | |
1019 | * dsl_pool_hold() | |
1020 | * dsl_dataset_hold() | |
1021 | * ... perform checks ... | |
1022 | * dsl_dataset_long_hold() | |
1023 | * dsl_pool_rele() | |
1024 | * ... perform long-running task ... | |
1025 | * dsl_dataset_long_rele() | |
1026 | * dsl_dataset_rele() | |
1027 | * | |
1028 | * Note that when the long hold is released, the dataset is still held but | |
1029 | * the pool is not held. The dataset may change arbitrarily during this time | |
1030 | * (e.g. it could be destroyed). Therefore you shouldn't do anything to the | |
1031 | * dataset except release it. | |
1032 | * | |
1033 | * User-initiated operations (e.g. ioctls, zfs_ioc_*()) are either read-only | |
1034 | * or modifying operations. | |
1035 | * | |
1036 | * Modifying operations should generally use dsl_sync_task(). The synctask | |
1037 | * infrastructure enforces proper locking strategy with respect to the | |
1038 | * dp_config_rwlock. See the comment above dsl_sync_task() for details. | |
1039 | * | |
1040 | * Read-only operations will manually hold the pool, then the dataset, obtain | |
1041 | * information from the dataset, then release the pool and dataset. | |
1042 | * dmu_objset_{hold,rele}() are convenience routines that also do the pool | |
1043 | * hold/rele. | |
1044 | */ | |
1045 | ||
1046 | int | |
1047 | dsl_pool_hold(const char *name, void *tag, dsl_pool_t **dp) | |
1048 | { | |
1049 | spa_t *spa; | |
1050 | int error; | |
1051 | ||
1052 | error = spa_open(name, &spa, tag); | |
1053 | if (error == 0) { | |
1054 | *dp = spa_get_dsl(spa); | |
1055 | dsl_pool_config_enter(*dp, tag); | |
1056 | } | |
1057 | return (error); | |
1058 | } | |
1059 | ||
1060 | void | |
1061 | dsl_pool_rele(dsl_pool_t *dp, void *tag) | |
1062 | { | |
1063 | dsl_pool_config_exit(dp, tag); | |
1064 | spa_close(dp->dp_spa, tag); | |
1065 | } | |
1066 | ||
1067 | void | |
1068 | dsl_pool_config_enter(dsl_pool_t *dp, void *tag) | |
1069 | { | |
1070 | /* | |
1071 | * We use a "reentrant" reader-writer lock, but not reentrantly. | |
1072 | * | |
1073 | * The rrwlock can (with the track_all flag) track all reading threads, | |
1074 | * which is very useful for debugging which code path failed to release | |
1075 | * the lock, and for verifying that the *current* thread does hold | |
1076 | * the lock. | |
1077 | * | |
1078 | * (Unlike a rwlock, which knows that N threads hold it for | |
1079 | * read, but not *which* threads, so rw_held(RW_READER) returns TRUE | |
1080 | * if any thread holds it for read, even if this thread doesn't). | |
1081 | */ | |
1082 | ASSERT(!rrw_held(&dp->dp_config_rwlock, RW_READER)); | |
1083 | rrw_enter(&dp->dp_config_rwlock, RW_READER, tag); | |
1084 | } | |
1085 | ||
5e8cd5d1 AJ |
1086 | void |
1087 | dsl_pool_config_enter_prio(dsl_pool_t *dp, void *tag) | |
1088 | { | |
1089 | ASSERT(!rrw_held(&dp->dp_config_rwlock, RW_READER)); | |
1090 | rrw_enter_read_prio(&dp->dp_config_rwlock, tag); | |
1091 | } | |
1092 | ||
13fe0198 MA |
1093 | void |
1094 | dsl_pool_config_exit(dsl_pool_t *dp, void *tag) | |
1095 | { | |
1096 | rrw_exit(&dp->dp_config_rwlock, tag); | |
1097 | } | |
1098 | ||
1099 | boolean_t | |
1100 | dsl_pool_config_held(dsl_pool_t *dp) | |
1101 | { | |
1102 | return (RRW_LOCK_HELD(&dp->dp_config_rwlock)); | |
1103 | } | |
1104 | ||
9c43027b AJ |
1105 | boolean_t |
1106 | dsl_pool_config_held_writer(dsl_pool_t *dp) | |
1107 | { | |
1108 | return (RRW_WRITE_HELD(&dp->dp_config_rwlock)); | |
1109 | } | |
1110 | ||
c409e464 | 1111 | #if defined(_KERNEL) && defined(HAVE_SPL) |
40a806df NB |
1112 | EXPORT_SYMBOL(dsl_pool_config_enter); |
1113 | EXPORT_SYMBOL(dsl_pool_config_exit); | |
1114 | ||
02730c33 | 1115 | /* BEGIN CSTYLED */ |
d1d7e268 | 1116 | /* zfs_dirty_data_max_percent only applied at module load in arc_init(). */ |
e8b96c60 MA |
1117 | module_param(zfs_dirty_data_max_percent, int, 0444); |
1118 | MODULE_PARM_DESC(zfs_dirty_data_max_percent, "percent of ram can be dirty"); | |
c409e464 | 1119 | |
d1d7e268 | 1120 | /* zfs_dirty_data_max_max_percent only applied at module load in arc_init(). */ |
e8b96c60 MA |
1121 | module_param(zfs_dirty_data_max_max_percent, int, 0444); |
1122 | MODULE_PARM_DESC(zfs_dirty_data_max_max_percent, | |
d1d7e268 | 1123 | "zfs_dirty_data_max upper bound as % of RAM"); |
c409e464 | 1124 | |
e8b96c60 MA |
1125 | module_param(zfs_delay_min_dirty_percent, int, 0644); |
1126 | MODULE_PARM_DESC(zfs_delay_min_dirty_percent, "transaction delay threshold"); | |
c409e464 | 1127 | |
e8b96c60 MA |
1128 | module_param(zfs_dirty_data_max, ulong, 0644); |
1129 | MODULE_PARM_DESC(zfs_dirty_data_max, "determines the dirty space limit"); | |
c409e464 | 1130 | |
d1d7e268 | 1131 | /* zfs_dirty_data_max_max only applied at module load in arc_init(). */ |
e8b96c60 MA |
1132 | module_param(zfs_dirty_data_max_max, ulong, 0444); |
1133 | MODULE_PARM_DESC(zfs_dirty_data_max_max, | |
d1d7e268 | 1134 | "zfs_dirty_data_max upper bound in bytes"); |
c409e464 | 1135 | |
e8b96c60 MA |
1136 | module_param(zfs_dirty_data_sync, ulong, 0644); |
1137 | MODULE_PARM_DESC(zfs_dirty_data_sync, "sync txg when this much dirty data"); | |
c409e464 | 1138 | |
e8b96c60 MA |
1139 | module_param(zfs_delay_scale, ulong, 0644); |
1140 | MODULE_PARM_DESC(zfs_delay_scale, "how quickly delay approaches infinity"); | |
64fc7762 MA |
1141 | |
1142 | module_param(zfs_sync_taskq_batch_pct, int, 0644); | |
1143 | MODULE_PARM_DESC(zfs_sync_taskq_batch_pct, | |
1144 | "max percent of CPUs that are used to sync dirty data"); | |
02730c33 | 1145 | /* END CSTYLED */ |
c409e464 | 1146 | #endif |