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Commit | Line | Data |
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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. |
b02fe35d | 23 | * Copyright (c) 2011, 2014 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. |
34dc7c2f BB |
26 | */ |
27 | ||
34dc7c2f BB |
28 | #include <sys/dsl_pool.h> |
29 | #include <sys/dsl_dataset.h> | |
428870ff | 30 | #include <sys/dsl_prop.h> |
34dc7c2f BB |
31 | #include <sys/dsl_dir.h> |
32 | #include <sys/dsl_synctask.h> | |
428870ff BB |
33 | #include <sys/dsl_scan.h> |
34 | #include <sys/dnode.h> | |
34dc7c2f BB |
35 | #include <sys/dmu_tx.h> |
36 | #include <sys/dmu_objset.h> | |
37 | #include <sys/arc.h> | |
38 | #include <sys/zap.h> | |
39 | #include <sys/zio.h> | |
40 | #include <sys/zfs_context.h> | |
41 | #include <sys/fs/zfs.h> | |
b128c09f BB |
42 | #include <sys/zfs_znode.h> |
43 | #include <sys/spa_impl.h> | |
428870ff | 44 | #include <sys/dsl_deadlist.h> |
9ae529ec CS |
45 | #include <sys/bptree.h> |
46 | #include <sys/zfeature.h> | |
29809a6c | 47 | #include <sys/zil_impl.h> |
13fe0198 | 48 | #include <sys/dsl_userhold.h> |
49ee64e5 | 49 | #include <sys/trace_txg.h> |
34dc7c2f | 50 | |
e8b96c60 MA |
51 | /* |
52 | * ZFS Write Throttle | |
53 | * ------------------ | |
54 | * | |
55 | * ZFS must limit the rate of incoming writes to the rate at which it is able | |
56 | * to sync data modifications to the backend storage. Throttling by too much | |
57 | * creates an artificial limit; throttling by too little can only be sustained | |
58 | * for short periods and would lead to highly lumpy performance. On a per-pool | |
59 | * basis, ZFS tracks the amount of modified (dirty) data. As operations change | |
60 | * data, the amount of dirty data increases; as ZFS syncs out data, the amount | |
61 | * of dirty data decreases. When the amount of dirty data exceeds a | |
62 | * predetermined threshold further modifications are blocked until the amount | |
63 | * of dirty data decreases (as data is synced out). | |
64 | * | |
65 | * The limit on dirty data is tunable, and should be adjusted according to | |
66 | * both the IO capacity and available memory of the system. The larger the | |
67 | * window, the more ZFS is able to aggregate and amortize metadata (and data) | |
68 | * changes. However, memory is a limited resource, and allowing for more dirty | |
69 | * data comes at the cost of keeping other useful data in memory (for example | |
70 | * ZFS data cached by the ARC). | |
71 | * | |
72 | * Implementation | |
73 | * | |
74 | * As buffers are modified dsl_pool_willuse_space() increments both the per- | |
75 | * txg (dp_dirty_pertxg[]) and poolwide (dp_dirty_total) accounting of | |
76 | * dirty space used; dsl_pool_dirty_space() decrements those values as data | |
77 | * is synced out from dsl_pool_sync(). While only the poolwide value is | |
78 | * relevant, the per-txg value is useful for debugging. The tunable | |
79 | * zfs_dirty_data_max determines the dirty space limit. Once that value is | |
80 | * exceeded, new writes are halted until space frees up. | |
81 | * | |
82 | * The zfs_dirty_data_sync tunable dictates the threshold at which we | |
83 | * ensure that there is a txg syncing (see the comment in txg.c for a full | |
84 | * description of transaction group stages). | |
85 | * | |
86 | * The IO scheduler uses both the dirty space limit and current amount of | |
87 | * dirty data as inputs. Those values affect the number of concurrent IOs ZFS | |
88 | * issues. See the comment in vdev_queue.c for details of the IO scheduler. | |
89 | * | |
90 | * The delay is also calculated based on the amount of dirty data. See the | |
91 | * comment above dmu_tx_delay() for details. | |
92 | */ | |
93 | ||
94 | /* | |
95 | * zfs_dirty_data_max will be set to zfs_dirty_data_max_percent% of all memory, | |
96 | * capped at zfs_dirty_data_max_max. It can also be overridden with a module | |
97 | * parameter. | |
98 | */ | |
99 | unsigned long zfs_dirty_data_max = 0; | |
100 | unsigned long zfs_dirty_data_max_max = 0; | |
101 | int zfs_dirty_data_max_percent = 10; | |
102 | int zfs_dirty_data_max_max_percent = 25; | |
b128c09f | 103 | |
e8b96c60 MA |
104 | /* |
105 | * If there is at least this much dirty data, push out a txg. | |
106 | */ | |
107 | unsigned long zfs_dirty_data_sync = 64 * 1024 * 1024; | |
34dc7c2f | 108 | |
e8b96c60 MA |
109 | /* |
110 | * Once there is this amount of dirty data, the dmu_tx_delay() will kick in | |
111 | * and delay each transaction. | |
112 | * This value should be >= zfs_vdev_async_write_active_max_dirty_percent. | |
113 | */ | |
114 | int zfs_delay_min_dirty_percent = 60; | |
b128c09f | 115 | |
e8b96c60 MA |
116 | /* |
117 | * This controls how quickly the delay approaches infinity. | |
118 | * Larger values cause it to delay more for a given amount of dirty data. | |
119 | * Therefore larger values will cause there to be less dirty data for a | |
120 | * given throughput. | |
121 | * | |
122 | * For the smoothest delay, this value should be about 1 billion divided | |
123 | * by the maximum number of operations per second. This will smoothly | |
124 | * handle between 10x and 1/10th this number. | |
125 | * | |
126 | * Note: zfs_delay_scale * zfs_dirty_data_max must be < 2^64, due to the | |
127 | * multiply in dmu_tx_delay(). | |
128 | */ | |
129 | unsigned long zfs_delay_scale = 1000 * 1000 * 1000 / 2000; | |
b128c09f | 130 | |
63fd3c6c AL |
131 | hrtime_t zfs_throttle_delay = MSEC2NSEC(10); |
132 | hrtime_t zfs_throttle_resolution = MSEC2NSEC(10); | |
133 | ||
428870ff | 134 | int |
b128c09f | 135 | dsl_pool_open_special_dir(dsl_pool_t *dp, const char *name, dsl_dir_t **ddp) |
34dc7c2f BB |
136 | { |
137 | uint64_t obj; | |
138 | int err; | |
139 | ||
140 | err = zap_lookup(dp->dp_meta_objset, | |
d683ddbb | 141 | dsl_dir_phys(dp->dp_root_dir)->dd_child_dir_zapobj, |
b128c09f | 142 | name, sizeof (obj), 1, &obj); |
34dc7c2f BB |
143 | if (err) |
144 | return (err); | |
145 | ||
13fe0198 | 146 | return (dsl_dir_hold_obj(dp, obj, name, dp, ddp)); |
34dc7c2f BB |
147 | } |
148 | ||
149 | static dsl_pool_t * | |
150 | dsl_pool_open_impl(spa_t *spa, uint64_t txg) | |
151 | { | |
152 | dsl_pool_t *dp; | |
153 | blkptr_t *bp = spa_get_rootblkptr(spa); | |
34dc7c2f BB |
154 | |
155 | dp = kmem_zalloc(sizeof (dsl_pool_t), KM_SLEEP); | |
156 | dp->dp_spa = spa; | |
157 | dp->dp_meta_rootbp = *bp; | |
13fe0198 | 158 | rrw_init(&dp->dp_config_rwlock, B_TRUE); |
34dc7c2f BB |
159 | txg_init(dp, txg); |
160 | ||
161 | txg_list_create(&dp->dp_dirty_datasets, | |
162 | offsetof(dsl_dataset_t, ds_dirty_link)); | |
29809a6c MA |
163 | txg_list_create(&dp->dp_dirty_zilogs, |
164 | offsetof(zilog_t, zl_dirty_link)); | |
34dc7c2f BB |
165 | txg_list_create(&dp->dp_dirty_dirs, |
166 | offsetof(dsl_dir_t, dd_dirty_link)); | |
167 | txg_list_create(&dp->dp_sync_tasks, | |
13fe0198 | 168 | offsetof(dsl_sync_task_t, dst_node)); |
34dc7c2f BB |
169 | |
170 | mutex_init(&dp->dp_lock, NULL, MUTEX_DEFAULT, NULL); | |
e8b96c60 | 171 | cv_init(&dp->dp_spaceavail_cv, NULL, CV_DEFAULT, NULL); |
34dc7c2f | 172 | |
3558fd73 | 173 | dp->dp_iput_taskq = taskq_create("zfs_iput_taskq", 1, minclsyspri, |
9babb374 BB |
174 | 1, 4, 0); |
175 | ||
34dc7c2f BB |
176 | return (dp); |
177 | } | |
178 | ||
179 | int | |
9ae529ec | 180 | dsl_pool_init(spa_t *spa, uint64_t txg, dsl_pool_t **dpp) |
34dc7c2f BB |
181 | { |
182 | int err; | |
183 | dsl_pool_t *dp = dsl_pool_open_impl(spa, txg); | |
9ae529ec CS |
184 | |
185 | err = dmu_objset_open_impl(spa, NULL, &dp->dp_meta_rootbp, | |
186 | &dp->dp_meta_objset); | |
187 | if (err != 0) | |
188 | dsl_pool_close(dp); | |
189 | else | |
190 | *dpp = dp; | |
191 | ||
192 | return (err); | |
193 | } | |
194 | ||
195 | int | |
196 | dsl_pool_open(dsl_pool_t *dp) | |
197 | { | |
198 | int err; | |
b128c09f BB |
199 | dsl_dir_t *dd; |
200 | dsl_dataset_t *ds; | |
428870ff | 201 | uint64_t obj; |
34dc7c2f | 202 | |
13fe0198 | 203 | rrw_enter(&dp->dp_config_rwlock, RW_WRITER, FTAG); |
34dc7c2f BB |
204 | err = zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, |
205 | DMU_POOL_ROOT_DATASET, sizeof (uint64_t), 1, | |
206 | &dp->dp_root_dir_obj); | |
207 | if (err) | |
208 | goto out; | |
209 | ||
13fe0198 | 210 | err = dsl_dir_hold_obj(dp, dp->dp_root_dir_obj, |
34dc7c2f BB |
211 | NULL, dp, &dp->dp_root_dir); |
212 | if (err) | |
213 | goto out; | |
214 | ||
b128c09f | 215 | err = dsl_pool_open_special_dir(dp, MOS_DIR_NAME, &dp->dp_mos_dir); |
34dc7c2f BB |
216 | if (err) |
217 | goto out; | |
218 | ||
9ae529ec | 219 | if (spa_version(dp->dp_spa) >= SPA_VERSION_ORIGIN) { |
b128c09f BB |
220 | err = dsl_pool_open_special_dir(dp, ORIGIN_DIR_NAME, &dd); |
221 | if (err) | |
222 | goto out; | |
d683ddbb JG |
223 | err = dsl_dataset_hold_obj(dp, |
224 | dsl_dir_phys(dd)->dd_head_dataset_obj, FTAG, &ds); | |
9babb374 BB |
225 | if (err == 0) { |
226 | err = dsl_dataset_hold_obj(dp, | |
d683ddbb | 227 | dsl_dataset_phys(ds)->ds_prev_snap_obj, dp, |
9babb374 BB |
228 | &dp->dp_origin_snap); |
229 | dsl_dataset_rele(ds, FTAG); | |
230 | } | |
13fe0198 | 231 | dsl_dir_rele(dd, dp); |
b128c09f BB |
232 | if (err) |
233 | goto out; | |
b128c09f BB |
234 | } |
235 | ||
9ae529ec | 236 | if (spa_version(dp->dp_spa) >= SPA_VERSION_DEADLISTS) { |
428870ff BB |
237 | err = dsl_pool_open_special_dir(dp, FREE_DIR_NAME, |
238 | &dp->dp_free_dir); | |
b128c09f BB |
239 | if (err) |
240 | goto out; | |
428870ff | 241 | |
b128c09f | 242 | err = zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, |
428870ff | 243 | DMU_POOL_FREE_BPOBJ, sizeof (uint64_t), 1, &obj); |
b128c09f BB |
244 | if (err) |
245 | goto out; | |
13fe0198 | 246 | VERIFY0(bpobj_open(&dp->dp_free_bpobj, |
428870ff | 247 | dp->dp_meta_objset, obj)); |
b128c09f BB |
248 | } |
249 | ||
fbeddd60 MA |
250 | /* |
251 | * Note: errors ignored, because the leak dir will not exist if we | |
252 | * have not encountered a leak yet. | |
253 | */ | |
254 | (void) dsl_pool_open_special_dir(dp, LEAK_DIR_NAME, | |
255 | &dp->dp_leak_dir); | |
256 | ||
fa86b5db | 257 | if (spa_feature_is_active(dp->dp_spa, SPA_FEATURE_ASYNC_DESTROY)) { |
9ae529ec CS |
258 | err = zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, |
259 | DMU_POOL_BPTREE_OBJ, sizeof (uint64_t), 1, | |
260 | &dp->dp_bptree_obj); | |
261 | if (err != 0) | |
262 | goto out; | |
263 | } | |
264 | ||
fa86b5db | 265 | if (spa_feature_is_active(dp->dp_spa, SPA_FEATURE_EMPTY_BPOBJ)) { |
753c3839 MA |
266 | err = zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, |
267 | DMU_POOL_EMPTY_BPOBJ, sizeof (uint64_t), 1, | |
268 | &dp->dp_empty_bpobj); | |
269 | if (err != 0) | |
270 | goto out; | |
271 | } | |
272 | ||
428870ff BB |
273 | err = zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, |
274 | DMU_POOL_TMP_USERREFS, sizeof (uint64_t), 1, | |
275 | &dp->dp_tmp_userrefs_obj); | |
276 | if (err == ENOENT) | |
277 | err = 0; | |
278 | if (err) | |
279 | goto out; | |
280 | ||
9ae529ec | 281 | err = dsl_scan_init(dp, dp->dp_tx.tx_open_txg); |
428870ff | 282 | |
34dc7c2f | 283 | out: |
13fe0198 | 284 | rrw_exit(&dp->dp_config_rwlock, FTAG); |
34dc7c2f BB |
285 | return (err); |
286 | } | |
287 | ||
288 | void | |
289 | dsl_pool_close(dsl_pool_t *dp) | |
290 | { | |
b128c09f | 291 | /* |
e8b96c60 MA |
292 | * Drop our references from dsl_pool_open(). |
293 | * | |
b128c09f BB |
294 | * Since we held the origin_snap from "syncing" context (which |
295 | * includes pool-opening context), it actually only got a "ref" | |
296 | * and not a hold, so just drop that here. | |
297 | */ | |
298 | if (dp->dp_origin_snap) | |
13fe0198 | 299 | dsl_dataset_rele(dp->dp_origin_snap, dp); |
34dc7c2f | 300 | if (dp->dp_mos_dir) |
13fe0198 | 301 | dsl_dir_rele(dp->dp_mos_dir, dp); |
428870ff | 302 | if (dp->dp_free_dir) |
13fe0198 | 303 | dsl_dir_rele(dp->dp_free_dir, dp); |
fbeddd60 MA |
304 | if (dp->dp_leak_dir) |
305 | dsl_dir_rele(dp->dp_leak_dir, dp); | |
34dc7c2f | 306 | if (dp->dp_root_dir) |
13fe0198 | 307 | dsl_dir_rele(dp->dp_root_dir, dp); |
34dc7c2f | 308 | |
428870ff BB |
309 | bpobj_close(&dp->dp_free_bpobj); |
310 | ||
34dc7c2f BB |
311 | /* undo the dmu_objset_open_impl(mos) from dsl_pool_open() */ |
312 | if (dp->dp_meta_objset) | |
428870ff | 313 | dmu_objset_evict(dp->dp_meta_objset); |
34dc7c2f BB |
314 | |
315 | txg_list_destroy(&dp->dp_dirty_datasets); | |
29809a6c | 316 | txg_list_destroy(&dp->dp_dirty_zilogs); |
428870ff | 317 | txg_list_destroy(&dp->dp_sync_tasks); |
34dc7c2f | 318 | txg_list_destroy(&dp->dp_dirty_dirs); |
34dc7c2f BB |
319 | |
320 | arc_flush(dp->dp_spa); | |
321 | txg_fini(dp); | |
428870ff | 322 | dsl_scan_fini(dp); |
0c66c32d JG |
323 | dmu_buf_user_evict_wait(); |
324 | ||
13fe0198 | 325 | rrw_destroy(&dp->dp_config_rwlock); |
34dc7c2f | 326 | mutex_destroy(&dp->dp_lock); |
3558fd73 | 327 | taskq_destroy(dp->dp_iput_taskq); |
b128c09f | 328 | if (dp->dp_blkstats) |
79c76d5b | 329 | vmem_free(dp->dp_blkstats, sizeof (zfs_all_blkstats_t)); |
34dc7c2f BB |
330 | kmem_free(dp, sizeof (dsl_pool_t)); |
331 | } | |
332 | ||
333 | dsl_pool_t * | |
b128c09f | 334 | dsl_pool_create(spa_t *spa, nvlist_t *zplprops, uint64_t txg) |
34dc7c2f BB |
335 | { |
336 | int err; | |
337 | dsl_pool_t *dp = dsl_pool_open_impl(spa, txg); | |
338 | dmu_tx_t *tx = dmu_tx_create_assigned(dp, txg); | |
428870ff | 339 | objset_t *os; |
b128c09f | 340 | dsl_dataset_t *ds; |
428870ff | 341 | uint64_t obj; |
b128c09f | 342 | |
13fe0198 MA |
343 | rrw_enter(&dp->dp_config_rwlock, RW_WRITER, FTAG); |
344 | ||
b128c09f | 345 | /* create and open the MOS (meta-objset) */ |
428870ff BB |
346 | dp->dp_meta_objset = dmu_objset_create_impl(spa, |
347 | NULL, &dp->dp_meta_rootbp, DMU_OST_META, tx); | |
34dc7c2f BB |
348 | |
349 | /* create the pool directory */ | |
350 | err = zap_create_claim(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, | |
351 | DMU_OT_OBJECT_DIRECTORY, DMU_OT_NONE, 0, tx); | |
c99c9001 | 352 | ASSERT0(err); |
34dc7c2f | 353 | |
428870ff | 354 | /* Initialize scan structures */ |
13fe0198 | 355 | VERIFY0(dsl_scan_init(dp, txg)); |
428870ff | 356 | |
34dc7c2f | 357 | /* create and open the root dir */ |
b128c09f | 358 | dp->dp_root_dir_obj = dsl_dir_create_sync(dp, NULL, NULL, tx); |
13fe0198 | 359 | VERIFY0(dsl_dir_hold_obj(dp, dp->dp_root_dir_obj, |
34dc7c2f BB |
360 | NULL, dp, &dp->dp_root_dir)); |
361 | ||
362 | /* create and open the meta-objset dir */ | |
b128c09f | 363 | (void) dsl_dir_create_sync(dp, dp->dp_root_dir, MOS_DIR_NAME, tx); |
13fe0198 | 364 | VERIFY0(dsl_pool_open_special_dir(dp, |
b128c09f BB |
365 | MOS_DIR_NAME, &dp->dp_mos_dir)); |
366 | ||
428870ff BB |
367 | if (spa_version(spa) >= SPA_VERSION_DEADLISTS) { |
368 | /* create and open the free dir */ | |
369 | (void) dsl_dir_create_sync(dp, dp->dp_root_dir, | |
370 | FREE_DIR_NAME, tx); | |
13fe0198 | 371 | VERIFY0(dsl_pool_open_special_dir(dp, |
428870ff BB |
372 | FREE_DIR_NAME, &dp->dp_free_dir)); |
373 | ||
374 | /* create and open the free_bplist */ | |
375 | obj = bpobj_alloc(dp->dp_meta_objset, SPA_MAXBLOCKSIZE, tx); | |
376 | VERIFY(zap_add(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, | |
377 | DMU_POOL_FREE_BPOBJ, sizeof (uint64_t), 1, &obj, tx) == 0); | |
13fe0198 | 378 | VERIFY0(bpobj_open(&dp->dp_free_bpobj, |
428870ff BB |
379 | dp->dp_meta_objset, obj)); |
380 | } | |
381 | ||
b128c09f BB |
382 | if (spa_version(spa) >= SPA_VERSION_DSL_SCRUB) |
383 | dsl_pool_create_origin(dp, tx); | |
384 | ||
385 | /* create the root dataset */ | |
428870ff | 386 | obj = dsl_dataset_create_sync_dd(dp->dp_root_dir, NULL, 0, tx); |
b128c09f BB |
387 | |
388 | /* create the root objset */ | |
13fe0198 | 389 | VERIFY0(dsl_dataset_hold_obj(dp, obj, FTAG, &ds)); |
0fe3d820 BB |
390 | VERIFY(NULL != (os = dmu_objset_create_impl(dp->dp_spa, ds, |
391 | dsl_dataset_get_blkptr(ds), DMU_OST_ZFS, tx))); | |
b128c09f | 392 | #ifdef _KERNEL |
428870ff | 393 | zfs_create_fs(os, kcred, zplprops, tx); |
b128c09f BB |
394 | #endif |
395 | dsl_dataset_rele(ds, FTAG); | |
34dc7c2f BB |
396 | |
397 | dmu_tx_commit(tx); | |
398 | ||
13fe0198 MA |
399 | rrw_exit(&dp->dp_config_rwlock, FTAG); |
400 | ||
34dc7c2f BB |
401 | return (dp); |
402 | } | |
403 | ||
29809a6c MA |
404 | /* |
405 | * Account for the meta-objset space in its placeholder dsl_dir. | |
406 | */ | |
407 | void | |
408 | dsl_pool_mos_diduse_space(dsl_pool_t *dp, | |
409 | int64_t used, int64_t comp, int64_t uncomp) | |
410 | { | |
411 | ASSERT3U(comp, ==, uncomp); /* it's all metadata */ | |
412 | mutex_enter(&dp->dp_lock); | |
413 | dp->dp_mos_used_delta += used; | |
414 | dp->dp_mos_compressed_delta += comp; | |
415 | dp->dp_mos_uncompressed_delta += uncomp; | |
416 | mutex_exit(&dp->dp_lock); | |
417 | } | |
418 | ||
428870ff BB |
419 | static int |
420 | deadlist_enqueue_cb(void *arg, const blkptr_t *bp, dmu_tx_t *tx) | |
421 | { | |
422 | dsl_deadlist_t *dl = arg; | |
423 | dsl_deadlist_insert(dl, bp, tx); | |
424 | return (0); | |
425 | } | |
426 | ||
e8b96c60 MA |
427 | static void |
428 | dsl_pool_sync_mos(dsl_pool_t *dp, dmu_tx_t *tx) | |
429 | { | |
430 | zio_t *zio = zio_root(dp->dp_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED); | |
431 | dmu_objset_sync(dp->dp_meta_objset, zio, tx); | |
432 | VERIFY0(zio_wait(zio)); | |
433 | dprintf_bp(&dp->dp_meta_rootbp, "meta objset rootbp is %s", ""); | |
434 | spa_set_rootblkptr(dp->dp_spa, &dp->dp_meta_rootbp); | |
435 | } | |
436 | ||
437 | static void | |
438 | dsl_pool_dirty_delta(dsl_pool_t *dp, int64_t delta) | |
439 | { | |
440 | ASSERT(MUTEX_HELD(&dp->dp_lock)); | |
441 | ||
442 | if (delta < 0) | |
443 | ASSERT3U(-delta, <=, dp->dp_dirty_total); | |
444 | ||
445 | dp->dp_dirty_total += delta; | |
446 | ||
447 | /* | |
448 | * Note: we signal even when increasing dp_dirty_total. | |
449 | * This ensures forward progress -- each thread wakes the next waiter. | |
450 | */ | |
451 | if (dp->dp_dirty_total <= zfs_dirty_data_max) | |
452 | cv_signal(&dp->dp_spaceavail_cv); | |
453 | } | |
454 | ||
34dc7c2f BB |
455 | void |
456 | dsl_pool_sync(dsl_pool_t *dp, uint64_t txg) | |
457 | { | |
458 | zio_t *zio; | |
459 | dmu_tx_t *tx; | |
460 | dsl_dir_t *dd; | |
461 | dsl_dataset_t *ds; | |
428870ff | 462 | objset_t *mos = dp->dp_meta_objset; |
29809a6c MA |
463 | list_t synced_datasets; |
464 | ||
465 | list_create(&synced_datasets, sizeof (dsl_dataset_t), | |
466 | offsetof(dsl_dataset_t, ds_synced_link)); | |
34dc7c2f BB |
467 | |
468 | tx = dmu_tx_create_assigned(dp, txg); | |
469 | ||
e8b96c60 MA |
470 | /* |
471 | * Write out all dirty blocks of dirty datasets. | |
472 | */ | |
34dc7c2f | 473 | zio = zio_root(dp->dp_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED); |
e8b96c60 | 474 | while ((ds = txg_list_remove(&dp->dp_dirty_datasets, txg)) != NULL) { |
9babb374 BB |
475 | /* |
476 | * We must not sync any non-MOS datasets twice, because | |
477 | * we may have taken a snapshot of them. However, we | |
478 | * may sync newly-created datasets on pass 2. | |
479 | */ | |
480 | ASSERT(!list_link_active(&ds->ds_synced_link)); | |
29809a6c | 481 | list_insert_tail(&synced_datasets, ds); |
34dc7c2f BB |
482 | dsl_dataset_sync(ds, zio, tx); |
483 | } | |
e8b96c60 | 484 | VERIFY0(zio_wait(zio)); |
9babb374 | 485 | |
e8b96c60 MA |
486 | /* |
487 | * We have written all of the accounted dirty data, so our | |
488 | * dp_space_towrite should now be zero. However, some seldom-used | |
489 | * code paths do not adhere to this (e.g. dbuf_undirty(), also | |
490 | * rounding error in dbuf_write_physdone). | |
491 | * Shore up the accounting of any dirtied space now. | |
492 | */ | |
493 | dsl_pool_undirty_space(dp, dp->dp_dirty_pertxg[txg & TXG_MASK], txg); | |
34dc7c2f | 494 | |
29809a6c MA |
495 | /* |
496 | * After the data blocks have been written (ensured by the zio_wait() | |
497 | * above), update the user/group space accounting. | |
498 | */ | |
e8b96c60 MA |
499 | for (ds = list_head(&synced_datasets); ds != NULL; |
500 | ds = list_next(&synced_datasets, ds)) { | |
428870ff | 501 | dmu_objset_do_userquota_updates(ds->ds_objset, tx); |
e8b96c60 | 502 | } |
9babb374 BB |
503 | |
504 | /* | |
505 | * Sync the datasets again to push out the changes due to | |
428870ff | 506 | * userspace updates. This must be done before we process the |
29809a6c MA |
507 | * sync tasks, so that any snapshots will have the correct |
508 | * user accounting information (and we won't get confused | |
509 | * about which blocks are part of the snapshot). | |
9babb374 BB |
510 | */ |
511 | zio = zio_root(dp->dp_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED); | |
e8b96c60 | 512 | while ((ds = txg_list_remove(&dp->dp_dirty_datasets, txg)) != NULL) { |
9babb374 BB |
513 | ASSERT(list_link_active(&ds->ds_synced_link)); |
514 | dmu_buf_rele(ds->ds_dbuf, ds); | |
515 | dsl_dataset_sync(ds, zio, tx); | |
516 | } | |
e8b96c60 | 517 | VERIFY0(zio_wait(zio)); |
9babb374 | 518 | |
428870ff | 519 | /* |
29809a6c MA |
520 | * Now that the datasets have been completely synced, we can |
521 | * clean up our in-memory structures accumulated while syncing: | |
522 | * | |
523 | * - move dead blocks from the pending deadlist to the on-disk deadlist | |
29809a6c | 524 | * - release hold from dsl_dataset_dirty() |
428870ff | 525 | */ |
e8b96c60 | 526 | while ((ds = list_remove_head(&synced_datasets)) != NULL) { |
29809a6c | 527 | ASSERTV(objset_t *os = ds->ds_objset); |
428870ff BB |
528 | bplist_iterate(&ds->ds_pending_deadlist, |
529 | deadlist_enqueue_cb, &ds->ds_deadlist, tx); | |
29809a6c MA |
530 | ASSERT(!dmu_objset_is_dirty(os, txg)); |
531 | dmu_buf_rele(ds->ds_dbuf, ds); | |
428870ff BB |
532 | } |
533 | ||
e8b96c60 | 534 | while ((dd = txg_list_remove(&dp->dp_dirty_dirs, txg)) != NULL) { |
34dc7c2f | 535 | dsl_dir_sync(dd, tx); |
e8b96c60 | 536 | } |
b128c09f | 537 | |
29809a6c MA |
538 | /* |
539 | * The MOS's space is accounted for in the pool/$MOS | |
540 | * (dp_mos_dir). We can't modify the mos while we're syncing | |
541 | * it, so we remember the deltas and apply them here. | |
542 | */ | |
543 | if (dp->dp_mos_used_delta != 0 || dp->dp_mos_compressed_delta != 0 || | |
544 | dp->dp_mos_uncompressed_delta != 0) { | |
545 | dsl_dir_diduse_space(dp->dp_mos_dir, DD_USED_HEAD, | |
546 | dp->dp_mos_used_delta, | |
547 | dp->dp_mos_compressed_delta, | |
548 | dp->dp_mos_uncompressed_delta, tx); | |
549 | dp->dp_mos_used_delta = 0; | |
550 | dp->dp_mos_compressed_delta = 0; | |
551 | dp->dp_mos_uncompressed_delta = 0; | |
552 | } | |
553 | ||
428870ff BB |
554 | if (list_head(&mos->os_dirty_dnodes[txg & TXG_MASK]) != NULL || |
555 | list_head(&mos->os_free_dnodes[txg & TXG_MASK]) != NULL) { | |
e8b96c60 | 556 | dsl_pool_sync_mos(dp, tx); |
34dc7c2f BB |
557 | } |
558 | ||
29809a6c MA |
559 | /* |
560 | * If we modify a dataset in the same txg that we want to destroy it, | |
561 | * its dsl_dir's dd_dbuf will be dirty, and thus have a hold on it. | |
562 | * dsl_dir_destroy_check() will fail if there are unexpected holds. | |
563 | * Therefore, we want to sync the MOS (thus syncing the dd_dbuf | |
564 | * and clearing the hold on it) before we process the sync_tasks. | |
565 | * The MOS data dirtied by the sync_tasks will be synced on the next | |
566 | * pass. | |
567 | */ | |
29809a6c | 568 | if (!txg_list_empty(&dp->dp_sync_tasks, txg)) { |
13fe0198 | 569 | dsl_sync_task_t *dst; |
29809a6c MA |
570 | /* |
571 | * No more sync tasks should have been added while we | |
572 | * were syncing. | |
573 | */ | |
e8b96c60 MA |
574 | ASSERT3U(spa_sync_pass(dp->dp_spa), ==, 1); |
575 | while ((dst = txg_list_remove(&dp->dp_sync_tasks, txg)) != NULL) | |
13fe0198 | 576 | dsl_sync_task_sync(dst, tx); |
29809a6c MA |
577 | } |
578 | ||
34dc7c2f | 579 | dmu_tx_commit(tx); |
b128c09f | 580 | |
e8b96c60 | 581 | DTRACE_PROBE2(dsl_pool_sync__done, dsl_pool_t *dp, dp, uint64_t, txg); |
34dc7c2f BB |
582 | } |
583 | ||
584 | void | |
428870ff | 585 | dsl_pool_sync_done(dsl_pool_t *dp, uint64_t txg) |
34dc7c2f | 586 | { |
29809a6c | 587 | zilog_t *zilog; |
34dc7c2f | 588 | |
29809a6c | 589 | while ((zilog = txg_list_remove(&dp->dp_dirty_zilogs, txg))) { |
e8b96c60 | 590 | dsl_dataset_t *ds = dmu_objset_ds(zilog->zl_os); |
29809a6c MA |
591 | zil_clean(zilog, txg); |
592 | ASSERT(!dmu_objset_is_dirty(zilog->zl_os, txg)); | |
593 | dmu_buf_rele(ds->ds_dbuf, zilog); | |
34dc7c2f | 594 | } |
428870ff | 595 | ASSERT(!dmu_objset_is_dirty(dp->dp_meta_objset, txg)); |
34dc7c2f BB |
596 | } |
597 | ||
598 | /* | |
599 | * TRUE if the current thread is the tx_sync_thread or if we | |
600 | * are being called from SPA context during pool initialization. | |
601 | */ | |
602 | int | |
603 | dsl_pool_sync_context(dsl_pool_t *dp) | |
604 | { | |
605 | return (curthread == dp->dp_tx.tx_sync_thread || | |
9ae529ec | 606 | spa_is_initializing(dp->dp_spa)); |
34dc7c2f BB |
607 | } |
608 | ||
609 | uint64_t | |
610 | dsl_pool_adjustedsize(dsl_pool_t *dp, boolean_t netfree) | |
611 | { | |
612 | uint64_t space, resv; | |
613 | ||
614 | /* | |
615 | * Reserve about 1.6% (1/64), or at least 32MB, for allocation | |
616 | * efficiency. | |
617 | * XXX The intent log is not accounted for, so it must fit | |
618 | * within this slop. | |
619 | * | |
620 | * If we're trying to assess whether it's OK to do a free, | |
621 | * cut the reservation in half to allow forward progress | |
622 | * (e.g. make it possible to rm(1) files from a full pool). | |
623 | */ | |
624 | space = spa_get_dspace(dp->dp_spa); | |
625 | resv = MAX(space >> 6, SPA_MINDEVSIZE >> 1); | |
626 | if (netfree) | |
627 | resv >>= 1; | |
628 | ||
629 | return (space - resv); | |
630 | } | |
631 | ||
e8b96c60 MA |
632 | boolean_t |
633 | dsl_pool_need_dirty_delay(dsl_pool_t *dp) | |
34dc7c2f | 634 | { |
e8b96c60 MA |
635 | uint64_t delay_min_bytes = |
636 | zfs_dirty_data_max * zfs_delay_min_dirty_percent / 100; | |
637 | boolean_t rv; | |
34dc7c2f | 638 | |
e8b96c60 MA |
639 | mutex_enter(&dp->dp_lock); |
640 | if (dp->dp_dirty_total > zfs_dirty_data_sync) | |
641 | txg_kick(dp); | |
642 | rv = (dp->dp_dirty_total > delay_min_bytes); | |
643 | mutex_exit(&dp->dp_lock); | |
644 | return (rv); | |
34dc7c2f BB |
645 | } |
646 | ||
647 | void | |
e8b96c60 | 648 | dsl_pool_dirty_space(dsl_pool_t *dp, int64_t space, dmu_tx_t *tx) |
34dc7c2f | 649 | { |
e8b96c60 MA |
650 | if (space > 0) { |
651 | mutex_enter(&dp->dp_lock); | |
652 | dp->dp_dirty_pertxg[tx->tx_txg & TXG_MASK] += space; | |
653 | dsl_pool_dirty_delta(dp, space); | |
654 | mutex_exit(&dp->dp_lock); | |
655 | } | |
34dc7c2f BB |
656 | } |
657 | ||
658 | void | |
e8b96c60 | 659 | dsl_pool_undirty_space(dsl_pool_t *dp, int64_t space, uint64_t txg) |
34dc7c2f | 660 | { |
e8b96c60 MA |
661 | ASSERT3S(space, >=, 0); |
662 | if (space == 0) | |
34dc7c2f BB |
663 | return; |
664 | ||
e8b96c60 MA |
665 | mutex_enter(&dp->dp_lock); |
666 | if (dp->dp_dirty_pertxg[txg & TXG_MASK] < space) { | |
667 | /* XXX writing something we didn't dirty? */ | |
668 | space = dp->dp_dirty_pertxg[txg & TXG_MASK]; | |
34dc7c2f | 669 | } |
e8b96c60 MA |
670 | ASSERT3U(dp->dp_dirty_pertxg[txg & TXG_MASK], >=, space); |
671 | dp->dp_dirty_pertxg[txg & TXG_MASK] -= space; | |
672 | ASSERT3U(dp->dp_dirty_total, >=, space); | |
673 | dsl_pool_dirty_delta(dp, -space); | |
674 | mutex_exit(&dp->dp_lock); | |
34dc7c2f | 675 | } |
b128c09f BB |
676 | |
677 | /* ARGSUSED */ | |
678 | static int | |
13fe0198 | 679 | upgrade_clones_cb(dsl_pool_t *dp, dsl_dataset_t *hds, void *arg) |
b128c09f BB |
680 | { |
681 | dmu_tx_t *tx = arg; | |
682 | dsl_dataset_t *ds, *prev = NULL; | |
683 | int err; | |
b128c09f | 684 | |
13fe0198 | 685 | err = dsl_dataset_hold_obj(dp, hds->ds_object, FTAG, &ds); |
b128c09f BB |
686 | if (err) |
687 | return (err); | |
688 | ||
d683ddbb JG |
689 | while (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) { |
690 | err = dsl_dataset_hold_obj(dp, | |
691 | dsl_dataset_phys(ds)->ds_prev_snap_obj, FTAG, &prev); | |
b128c09f BB |
692 | if (err) { |
693 | dsl_dataset_rele(ds, FTAG); | |
694 | return (err); | |
695 | } | |
696 | ||
d683ddbb | 697 | if (dsl_dataset_phys(prev)->ds_next_snap_obj != ds->ds_object) |
b128c09f BB |
698 | break; |
699 | dsl_dataset_rele(ds, FTAG); | |
700 | ds = prev; | |
701 | prev = NULL; | |
702 | } | |
703 | ||
704 | if (prev == NULL) { | |
705 | prev = dp->dp_origin_snap; | |
706 | ||
707 | /* | |
708 | * The $ORIGIN can't have any data, or the accounting | |
709 | * will be wrong. | |
710 | */ | |
d683ddbb | 711 | ASSERT0(dsl_dataset_phys(prev)->ds_bp.blk_birth); |
b128c09f BB |
712 | |
713 | /* The origin doesn't get attached to itself */ | |
714 | if (ds->ds_object == prev->ds_object) { | |
715 | dsl_dataset_rele(ds, FTAG); | |
716 | return (0); | |
717 | } | |
718 | ||
719 | dmu_buf_will_dirty(ds->ds_dbuf, tx); | |
d683ddbb JG |
720 | dsl_dataset_phys(ds)->ds_prev_snap_obj = prev->ds_object; |
721 | dsl_dataset_phys(ds)->ds_prev_snap_txg = | |
722 | dsl_dataset_phys(prev)->ds_creation_txg; | |
b128c09f BB |
723 | |
724 | dmu_buf_will_dirty(ds->ds_dir->dd_dbuf, tx); | |
d683ddbb | 725 | dsl_dir_phys(ds->ds_dir)->dd_origin_obj = prev->ds_object; |
b128c09f BB |
726 | |
727 | dmu_buf_will_dirty(prev->ds_dbuf, tx); | |
d683ddbb | 728 | dsl_dataset_phys(prev)->ds_num_children++; |
b128c09f | 729 | |
d683ddbb | 730 | if (dsl_dataset_phys(ds)->ds_next_snap_obj == 0) { |
b128c09f | 731 | ASSERT(ds->ds_prev == NULL); |
13fe0198 | 732 | VERIFY0(dsl_dataset_hold_obj(dp, |
d683ddbb JG |
733 | dsl_dataset_phys(ds)->ds_prev_snap_obj, |
734 | ds, &ds->ds_prev)); | |
b128c09f BB |
735 | } |
736 | } | |
737 | ||
d683ddbb JG |
738 | ASSERT3U(dsl_dir_phys(ds->ds_dir)->dd_origin_obj, ==, prev->ds_object); |
739 | ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_obj, ==, prev->ds_object); | |
b128c09f | 740 | |
d683ddbb | 741 | if (dsl_dataset_phys(prev)->ds_next_clones_obj == 0) { |
428870ff | 742 | dmu_buf_will_dirty(prev->ds_dbuf, tx); |
d683ddbb | 743 | dsl_dataset_phys(prev)->ds_next_clones_obj = |
b128c09f BB |
744 | zap_create(dp->dp_meta_objset, |
745 | DMU_OT_NEXT_CLONES, DMU_OT_NONE, 0, tx); | |
746 | } | |
13fe0198 | 747 | VERIFY0(zap_add_int(dp->dp_meta_objset, |
d683ddbb | 748 | dsl_dataset_phys(prev)->ds_next_clones_obj, ds->ds_object, tx)); |
b128c09f BB |
749 | |
750 | dsl_dataset_rele(ds, FTAG); | |
751 | if (prev != dp->dp_origin_snap) | |
752 | dsl_dataset_rele(prev, FTAG); | |
753 | return (0); | |
754 | } | |
755 | ||
756 | void | |
757 | dsl_pool_upgrade_clones(dsl_pool_t *dp, dmu_tx_t *tx) | |
758 | { | |
759 | ASSERT(dmu_tx_is_syncing(tx)); | |
760 | ASSERT(dp->dp_origin_snap != NULL); | |
761 | ||
13fe0198 | 762 | VERIFY0(dmu_objset_find_dp(dp, dp->dp_root_dir_obj, upgrade_clones_cb, |
428870ff BB |
763 | tx, DS_FIND_CHILDREN)); |
764 | } | |
765 | ||
766 | /* ARGSUSED */ | |
767 | static int | |
13fe0198 | 768 | upgrade_dir_clones_cb(dsl_pool_t *dp, dsl_dataset_t *ds, void *arg) |
428870ff BB |
769 | { |
770 | dmu_tx_t *tx = arg; | |
428870ff BB |
771 | objset_t *mos = dp->dp_meta_objset; |
772 | ||
d683ddbb | 773 | if (dsl_dir_phys(ds->ds_dir)->dd_origin_obj != 0) { |
428870ff BB |
774 | dsl_dataset_t *origin; |
775 | ||
13fe0198 | 776 | VERIFY0(dsl_dataset_hold_obj(dp, |
d683ddbb | 777 | dsl_dir_phys(ds->ds_dir)->dd_origin_obj, FTAG, &origin)); |
428870ff | 778 | |
d683ddbb | 779 | if (dsl_dir_phys(origin->ds_dir)->dd_clones == 0) { |
428870ff | 780 | dmu_buf_will_dirty(origin->ds_dir->dd_dbuf, tx); |
d683ddbb JG |
781 | dsl_dir_phys(origin->ds_dir)->dd_clones = |
782 | zap_create(mos, DMU_OT_DSL_CLONES, DMU_OT_NONE, | |
783 | 0, tx); | |
428870ff BB |
784 | } |
785 | ||
13fe0198 | 786 | VERIFY0(zap_add_int(dp->dp_meta_objset, |
d683ddbb JG |
787 | dsl_dir_phys(origin->ds_dir)->dd_clones, |
788 | ds->ds_object, tx)); | |
428870ff BB |
789 | |
790 | dsl_dataset_rele(origin, FTAG); | |
791 | } | |
428870ff BB |
792 | return (0); |
793 | } | |
794 | ||
795 | void | |
796 | dsl_pool_upgrade_dir_clones(dsl_pool_t *dp, dmu_tx_t *tx) | |
797 | { | |
428870ff BB |
798 | uint64_t obj; |
799 | ||
d6320ddb BB |
800 | ASSERT(dmu_tx_is_syncing(tx)); |
801 | ||
428870ff | 802 | (void) dsl_dir_create_sync(dp, dp->dp_root_dir, FREE_DIR_NAME, tx); |
13fe0198 | 803 | VERIFY0(dsl_pool_open_special_dir(dp, |
428870ff BB |
804 | FREE_DIR_NAME, &dp->dp_free_dir)); |
805 | ||
806 | /* | |
807 | * We can't use bpobj_alloc(), because spa_version() still | |
808 | * returns the old version, and we need a new-version bpobj with | |
809 | * subobj support. So call dmu_object_alloc() directly. | |
810 | */ | |
811 | obj = dmu_object_alloc(dp->dp_meta_objset, DMU_OT_BPOBJ, | |
812 | SPA_MAXBLOCKSIZE, DMU_OT_BPOBJ_HDR, sizeof (bpobj_phys_t), tx); | |
13fe0198 | 813 | VERIFY0(zap_add(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, |
428870ff | 814 | DMU_POOL_FREE_BPOBJ, sizeof (uint64_t), 1, &obj, tx)); |
13fe0198 | 815 | VERIFY0(bpobj_open(&dp->dp_free_bpobj, dp->dp_meta_objset, obj)); |
428870ff | 816 | |
13fe0198 | 817 | VERIFY0(dmu_objset_find_dp(dp, dp->dp_root_dir_obj, |
428870ff | 818 | upgrade_dir_clones_cb, tx, DS_FIND_CHILDREN)); |
b128c09f BB |
819 | } |
820 | ||
821 | void | |
822 | dsl_pool_create_origin(dsl_pool_t *dp, dmu_tx_t *tx) | |
823 | { | |
824 | uint64_t dsobj; | |
825 | dsl_dataset_t *ds; | |
826 | ||
827 | ASSERT(dmu_tx_is_syncing(tx)); | |
828 | ASSERT(dp->dp_origin_snap == NULL); | |
13fe0198 | 829 | ASSERT(rrw_held(&dp->dp_config_rwlock, RW_WRITER)); |
b128c09f BB |
830 | |
831 | /* create the origin dir, ds, & snap-ds */ | |
b128c09f BB |
832 | dsobj = dsl_dataset_create_sync(dp->dp_root_dir, ORIGIN_DIR_NAME, |
833 | NULL, 0, kcred, tx); | |
13fe0198 MA |
834 | VERIFY0(dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds)); |
835 | dsl_dataset_snapshot_sync_impl(ds, ORIGIN_DIR_NAME, tx); | |
d683ddbb | 836 | VERIFY0(dsl_dataset_hold_obj(dp, dsl_dataset_phys(ds)->ds_prev_snap_obj, |
b128c09f BB |
837 | dp, &dp->dp_origin_snap)); |
838 | dsl_dataset_rele(ds, FTAG); | |
b128c09f | 839 | } |
9babb374 BB |
840 | |
841 | taskq_t * | |
3558fd73 | 842 | dsl_pool_iput_taskq(dsl_pool_t *dp) |
9babb374 | 843 | { |
3558fd73 | 844 | return (dp->dp_iput_taskq); |
9babb374 | 845 | } |
428870ff BB |
846 | |
847 | /* | |
848 | * Walk through the pool-wide zap object of temporary snapshot user holds | |
849 | * and release them. | |
850 | */ | |
851 | void | |
852 | dsl_pool_clean_tmp_userrefs(dsl_pool_t *dp) | |
853 | { | |
854 | zap_attribute_t za; | |
855 | zap_cursor_t zc; | |
856 | objset_t *mos = dp->dp_meta_objset; | |
857 | uint64_t zapobj = dp->dp_tmp_userrefs_obj; | |
95fd54a1 | 858 | nvlist_t *holds; |
428870ff BB |
859 | |
860 | if (zapobj == 0) | |
861 | return; | |
862 | ASSERT(spa_version(dp->dp_spa) >= SPA_VERSION_USERREFS); | |
863 | ||
95fd54a1 SH |
864 | holds = fnvlist_alloc(); |
865 | ||
428870ff BB |
866 | for (zap_cursor_init(&zc, mos, zapobj); |
867 | zap_cursor_retrieve(&zc, &za) == 0; | |
868 | zap_cursor_advance(&zc)) { | |
869 | char *htag; | |
95fd54a1 | 870 | nvlist_t *tags; |
428870ff BB |
871 | |
872 | htag = strchr(za.za_name, '-'); | |
873 | *htag = '\0'; | |
874 | ++htag; | |
95fd54a1 SH |
875 | if (nvlist_lookup_nvlist(holds, za.za_name, &tags) != 0) { |
876 | tags = fnvlist_alloc(); | |
877 | fnvlist_add_boolean(tags, htag); | |
878 | fnvlist_add_nvlist(holds, za.za_name, tags); | |
879 | fnvlist_free(tags); | |
880 | } else { | |
881 | fnvlist_add_boolean(tags, htag); | |
882 | } | |
428870ff | 883 | } |
95fd54a1 SH |
884 | dsl_dataset_user_release_tmp(dp, holds); |
885 | fnvlist_free(holds); | |
428870ff BB |
886 | zap_cursor_fini(&zc); |
887 | } | |
888 | ||
889 | /* | |
890 | * Create the pool-wide zap object for storing temporary snapshot holds. | |
891 | */ | |
892 | void | |
893 | dsl_pool_user_hold_create_obj(dsl_pool_t *dp, dmu_tx_t *tx) | |
894 | { | |
895 | objset_t *mos = dp->dp_meta_objset; | |
896 | ||
897 | ASSERT(dp->dp_tmp_userrefs_obj == 0); | |
898 | ASSERT(dmu_tx_is_syncing(tx)); | |
899 | ||
9ae529ec CS |
900 | dp->dp_tmp_userrefs_obj = zap_create_link(mos, DMU_OT_USERREFS, |
901 | DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_TMP_USERREFS, tx); | |
428870ff BB |
902 | } |
903 | ||
904 | static int | |
905 | dsl_pool_user_hold_rele_impl(dsl_pool_t *dp, uint64_t dsobj, | |
13fe0198 | 906 | const char *tag, uint64_t now, dmu_tx_t *tx, boolean_t holding) |
428870ff BB |
907 | { |
908 | objset_t *mos = dp->dp_meta_objset; | |
909 | uint64_t zapobj = dp->dp_tmp_userrefs_obj; | |
910 | char *name; | |
911 | int error; | |
912 | ||
913 | ASSERT(spa_version(dp->dp_spa) >= SPA_VERSION_USERREFS); | |
914 | ASSERT(dmu_tx_is_syncing(tx)); | |
915 | ||
916 | /* | |
917 | * If the pool was created prior to SPA_VERSION_USERREFS, the | |
918 | * zap object for temporary holds might not exist yet. | |
919 | */ | |
920 | if (zapobj == 0) { | |
921 | if (holding) { | |
922 | dsl_pool_user_hold_create_obj(dp, tx); | |
923 | zapobj = dp->dp_tmp_userrefs_obj; | |
924 | } else { | |
2e528b49 | 925 | return (SET_ERROR(ENOENT)); |
428870ff BB |
926 | } |
927 | } | |
928 | ||
929 | name = kmem_asprintf("%llx-%s", (u_longlong_t)dsobj, tag); | |
930 | if (holding) | |
13fe0198 | 931 | error = zap_add(mos, zapobj, name, 8, 1, &now, tx); |
428870ff BB |
932 | else |
933 | error = zap_remove(mos, zapobj, name, tx); | |
934 | strfree(name); | |
935 | ||
936 | return (error); | |
937 | } | |
938 | ||
939 | /* | |
940 | * Add a temporary hold for the given dataset object and tag. | |
941 | */ | |
942 | int | |
943 | dsl_pool_user_hold(dsl_pool_t *dp, uint64_t dsobj, const char *tag, | |
13fe0198 | 944 | uint64_t now, dmu_tx_t *tx) |
428870ff BB |
945 | { |
946 | return (dsl_pool_user_hold_rele_impl(dp, dsobj, tag, now, tx, B_TRUE)); | |
947 | } | |
948 | ||
949 | /* | |
950 | * Release a temporary hold for the given dataset object and tag. | |
951 | */ | |
952 | int | |
953 | dsl_pool_user_release(dsl_pool_t *dp, uint64_t dsobj, const char *tag, | |
954 | dmu_tx_t *tx) | |
955 | { | |
13fe0198 | 956 | return (dsl_pool_user_hold_rele_impl(dp, dsobj, tag, 0, |
428870ff BB |
957 | tx, B_FALSE)); |
958 | } | |
c409e464 | 959 | |
13fe0198 MA |
960 | /* |
961 | * DSL Pool Configuration Lock | |
962 | * | |
963 | * The dp_config_rwlock protects against changes to DSL state (e.g. dataset | |
964 | * creation / destruction / rename / property setting). It must be held for | |
965 | * read to hold a dataset or dsl_dir. I.e. you must call | |
966 | * dsl_pool_config_enter() or dsl_pool_hold() before calling | |
967 | * dsl_{dataset,dir}_hold{_obj}. In most circumstances, the dp_config_rwlock | |
968 | * must be held continuously until all datasets and dsl_dirs are released. | |
969 | * | |
970 | * The only exception to this rule is that if a "long hold" is placed on | |
971 | * a dataset, then the dp_config_rwlock may be dropped while the dataset | |
972 | * is still held. The long hold will prevent the dataset from being | |
973 | * destroyed -- the destroy will fail with EBUSY. A long hold can be | |
974 | * obtained by calling dsl_dataset_long_hold(), or by "owning" a dataset | |
975 | * (by calling dsl_{dataset,objset}_{try}own{_obj}). | |
976 | * | |
977 | * Legitimate long-holders (including owners) should be long-running, cancelable | |
978 | * tasks that should cause "zfs destroy" to fail. This includes DMU | |
979 | * consumers (i.e. a ZPL filesystem being mounted or ZVOL being open), | |
980 | * "zfs send", and "zfs diff". There are several other long-holders whose | |
981 | * uses are suboptimal (e.g. "zfs promote", and zil_suspend()). | |
982 | * | |
983 | * The usual formula for long-holding would be: | |
984 | * dsl_pool_hold() | |
985 | * dsl_dataset_hold() | |
986 | * ... perform checks ... | |
987 | * dsl_dataset_long_hold() | |
988 | * dsl_pool_rele() | |
989 | * ... perform long-running task ... | |
990 | * dsl_dataset_long_rele() | |
991 | * dsl_dataset_rele() | |
992 | * | |
993 | * Note that when the long hold is released, the dataset is still held but | |
994 | * the pool is not held. The dataset may change arbitrarily during this time | |
995 | * (e.g. it could be destroyed). Therefore you shouldn't do anything to the | |
996 | * dataset except release it. | |
997 | * | |
998 | * User-initiated operations (e.g. ioctls, zfs_ioc_*()) are either read-only | |
999 | * or modifying operations. | |
1000 | * | |
1001 | * Modifying operations should generally use dsl_sync_task(). The synctask | |
1002 | * infrastructure enforces proper locking strategy with respect to the | |
1003 | * dp_config_rwlock. See the comment above dsl_sync_task() for details. | |
1004 | * | |
1005 | * Read-only operations will manually hold the pool, then the dataset, obtain | |
1006 | * information from the dataset, then release the pool and dataset. | |
1007 | * dmu_objset_{hold,rele}() are convenience routines that also do the pool | |
1008 | * hold/rele. | |
1009 | */ | |
1010 | ||
1011 | int | |
1012 | dsl_pool_hold(const char *name, void *tag, dsl_pool_t **dp) | |
1013 | { | |
1014 | spa_t *spa; | |
1015 | int error; | |
1016 | ||
1017 | error = spa_open(name, &spa, tag); | |
1018 | if (error == 0) { | |
1019 | *dp = spa_get_dsl(spa); | |
1020 | dsl_pool_config_enter(*dp, tag); | |
1021 | } | |
1022 | return (error); | |
1023 | } | |
1024 | ||
1025 | void | |
1026 | dsl_pool_rele(dsl_pool_t *dp, void *tag) | |
1027 | { | |
1028 | dsl_pool_config_exit(dp, tag); | |
1029 | spa_close(dp->dp_spa, tag); | |
1030 | } | |
1031 | ||
1032 | void | |
1033 | dsl_pool_config_enter(dsl_pool_t *dp, void *tag) | |
1034 | { | |
1035 | /* | |
1036 | * We use a "reentrant" reader-writer lock, but not reentrantly. | |
1037 | * | |
1038 | * The rrwlock can (with the track_all flag) track all reading threads, | |
1039 | * which is very useful for debugging which code path failed to release | |
1040 | * the lock, and for verifying that the *current* thread does hold | |
1041 | * the lock. | |
1042 | * | |
1043 | * (Unlike a rwlock, which knows that N threads hold it for | |
1044 | * read, but not *which* threads, so rw_held(RW_READER) returns TRUE | |
1045 | * if any thread holds it for read, even if this thread doesn't). | |
1046 | */ | |
1047 | ASSERT(!rrw_held(&dp->dp_config_rwlock, RW_READER)); | |
1048 | rrw_enter(&dp->dp_config_rwlock, RW_READER, tag); | |
1049 | } | |
1050 | ||
1051 | void | |
1052 | dsl_pool_config_exit(dsl_pool_t *dp, void *tag) | |
1053 | { | |
1054 | rrw_exit(&dp->dp_config_rwlock, tag); | |
1055 | } | |
1056 | ||
1057 | boolean_t | |
1058 | dsl_pool_config_held(dsl_pool_t *dp) | |
1059 | { | |
1060 | return (RRW_LOCK_HELD(&dp->dp_config_rwlock)); | |
1061 | } | |
1062 | ||
c409e464 | 1063 | #if defined(_KERNEL) && defined(HAVE_SPL) |
40a806df NB |
1064 | EXPORT_SYMBOL(dsl_pool_config_enter); |
1065 | EXPORT_SYMBOL(dsl_pool_config_exit); | |
1066 | ||
d1d7e268 | 1067 | /* zfs_dirty_data_max_percent only applied at module load in arc_init(). */ |
e8b96c60 MA |
1068 | module_param(zfs_dirty_data_max_percent, int, 0444); |
1069 | MODULE_PARM_DESC(zfs_dirty_data_max_percent, "percent of ram can be dirty"); | |
c409e464 | 1070 | |
d1d7e268 | 1071 | /* zfs_dirty_data_max_max_percent only applied at module load in arc_init(). */ |
e8b96c60 MA |
1072 | module_param(zfs_dirty_data_max_max_percent, int, 0444); |
1073 | MODULE_PARM_DESC(zfs_dirty_data_max_max_percent, | |
d1d7e268 | 1074 | "zfs_dirty_data_max upper bound as % of RAM"); |
c409e464 | 1075 | |
e8b96c60 MA |
1076 | module_param(zfs_delay_min_dirty_percent, int, 0644); |
1077 | MODULE_PARM_DESC(zfs_delay_min_dirty_percent, "transaction delay threshold"); | |
c409e464 | 1078 | |
e8b96c60 MA |
1079 | module_param(zfs_dirty_data_max, ulong, 0644); |
1080 | MODULE_PARM_DESC(zfs_dirty_data_max, "determines the dirty space limit"); | |
c409e464 | 1081 | |
d1d7e268 | 1082 | /* zfs_dirty_data_max_max only applied at module load in arc_init(). */ |
e8b96c60 MA |
1083 | module_param(zfs_dirty_data_max_max, ulong, 0444); |
1084 | MODULE_PARM_DESC(zfs_dirty_data_max_max, | |
d1d7e268 | 1085 | "zfs_dirty_data_max upper bound in bytes"); |
c409e464 | 1086 | |
e8b96c60 MA |
1087 | module_param(zfs_dirty_data_sync, ulong, 0644); |
1088 | MODULE_PARM_DESC(zfs_dirty_data_sync, "sync txg when this much dirty data"); | |
c409e464 | 1089 | |
e8b96c60 MA |
1090 | module_param(zfs_delay_scale, ulong, 0644); |
1091 | MODULE_PARM_DESC(zfs_delay_scale, "how quickly delay approaches infinity"); | |
c409e464 | 1092 | #endif |