]>
Commit | Line | Data |
---|---|---|
13fe0198 MA |
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 | /* | |
22 | * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. | |
5dbd68a3 | 23 | * Copyright (c) 2012, 2014 by Delphix. All rights reserved. |
95fd54a1 | 24 | * Copyright (c) 2013 Steven Hartland. All rights reserved. |
788eb90c | 25 | * Copyright (c) 2013 by Joyent, Inc. All rights reserved. |
13fe0198 MA |
26 | */ |
27 | ||
28 | #include <sys/zfs_context.h> | |
29 | #include <sys/dsl_userhold.h> | |
30 | #include <sys/dsl_dataset.h> | |
31 | #include <sys/dsl_synctask.h> | |
32 | #include <sys/dmu_tx.h> | |
33 | #include <sys/dsl_pool.h> | |
34 | #include <sys/dsl_dir.h> | |
35 | #include <sys/dmu_traverse.h> | |
36 | #include <sys/dsl_scan.h> | |
37 | #include <sys/dmu_objset.h> | |
38 | #include <sys/zap.h> | |
39 | #include <sys/zfeature.h> | |
40 | #include <sys/zfs_ioctl.h> | |
41 | #include <sys/dsl_deleg.h> | |
fa86b5db | 42 | #include <sys/dmu_impl.h> |
13fe0198 MA |
43 | |
44 | typedef struct dmu_snapshots_destroy_arg { | |
45 | nvlist_t *dsda_snaps; | |
46 | nvlist_t *dsda_successful_snaps; | |
47 | boolean_t dsda_defer; | |
48 | nvlist_t *dsda_errlist; | |
49 | } dmu_snapshots_destroy_arg_t; | |
50 | ||
19580676 | 51 | int |
13fe0198 MA |
52 | dsl_destroy_snapshot_check_impl(dsl_dataset_t *ds, boolean_t defer) |
53 | { | |
54 | if (!dsl_dataset_is_snapshot(ds)) | |
2e528b49 | 55 | return (SET_ERROR(EINVAL)); |
13fe0198 MA |
56 | |
57 | if (dsl_dataset_long_held(ds)) | |
2e528b49 | 58 | return (SET_ERROR(EBUSY)); |
13fe0198 MA |
59 | |
60 | /* | |
61 | * Only allow deferred destroy on pools that support it. | |
62 | * NOTE: deferred destroy is only supported on snapshots. | |
63 | */ | |
64 | if (defer) { | |
65 | if (spa_version(ds->ds_dir->dd_pool->dp_spa) < | |
66 | SPA_VERSION_USERREFS) | |
2e528b49 | 67 | return (SET_ERROR(ENOTSUP)); |
13fe0198 MA |
68 | return (0); |
69 | } | |
70 | ||
71 | /* | |
72 | * If this snapshot has an elevated user reference count, | |
73 | * we can't destroy it yet. | |
74 | */ | |
75 | if (ds->ds_userrefs > 0) | |
2e528b49 | 76 | return (SET_ERROR(EBUSY)); |
13fe0198 MA |
77 | |
78 | /* | |
79 | * Can't delete a branch point. | |
80 | */ | |
d683ddbb | 81 | if (dsl_dataset_phys(ds)->ds_num_children > 1) |
2e528b49 | 82 | return (SET_ERROR(EEXIST)); |
13fe0198 MA |
83 | |
84 | return (0); | |
85 | } | |
86 | ||
87 | static int | |
88 | dsl_destroy_snapshot_check(void *arg, dmu_tx_t *tx) | |
89 | { | |
90 | dmu_snapshots_destroy_arg_t *dsda = arg; | |
91 | dsl_pool_t *dp = dmu_tx_pool(tx); | |
92 | nvpair_t *pair; | |
93 | int error = 0; | |
94 | ||
95 | if (!dmu_tx_is_syncing(tx)) | |
96 | return (0); | |
97 | ||
98 | for (pair = nvlist_next_nvpair(dsda->dsda_snaps, NULL); | |
99 | pair != NULL; pair = nvlist_next_nvpair(dsda->dsda_snaps, pair)) { | |
100 | dsl_dataset_t *ds; | |
101 | ||
102 | error = dsl_dataset_hold(dp, nvpair_name(pair), | |
103 | FTAG, &ds); | |
104 | ||
105 | /* | |
106 | * If the snapshot does not exist, silently ignore it | |
107 | * (it's "already destroyed"). | |
108 | */ | |
109 | if (error == ENOENT) | |
110 | continue; | |
111 | ||
112 | if (error == 0) { | |
113 | error = dsl_destroy_snapshot_check_impl(ds, | |
114 | dsda->dsda_defer); | |
115 | dsl_dataset_rele(ds, FTAG); | |
116 | } | |
117 | ||
118 | if (error == 0) { | |
119 | fnvlist_add_boolean(dsda->dsda_successful_snaps, | |
120 | nvpair_name(pair)); | |
121 | } else { | |
122 | fnvlist_add_int32(dsda->dsda_errlist, | |
123 | nvpair_name(pair), error); | |
124 | } | |
125 | } | |
126 | ||
127 | pair = nvlist_next_nvpair(dsda->dsda_errlist, NULL); | |
128 | if (pair != NULL) | |
129 | return (fnvpair_value_int32(pair)); | |
95fd54a1 | 130 | |
13fe0198 MA |
131 | return (0); |
132 | } | |
133 | ||
134 | struct process_old_arg { | |
135 | dsl_dataset_t *ds; | |
136 | dsl_dataset_t *ds_prev; | |
137 | boolean_t after_branch_point; | |
138 | zio_t *pio; | |
139 | uint64_t used, comp, uncomp; | |
140 | }; | |
141 | ||
142 | static int | |
143 | process_old_cb(void *arg, const blkptr_t *bp, dmu_tx_t *tx) | |
144 | { | |
145 | struct process_old_arg *poa = arg; | |
146 | dsl_pool_t *dp = poa->ds->ds_dir->dd_pool; | |
147 | ||
b0bc7a84 MG |
148 | ASSERT(!BP_IS_HOLE(bp)); |
149 | ||
d683ddbb | 150 | if (bp->blk_birth <= dsl_dataset_phys(poa->ds)->ds_prev_snap_txg) { |
13fe0198 MA |
151 | dsl_deadlist_insert(&poa->ds->ds_deadlist, bp, tx); |
152 | if (poa->ds_prev && !poa->after_branch_point && | |
153 | bp->blk_birth > | |
d683ddbb JG |
154 | dsl_dataset_phys(poa->ds_prev)->ds_prev_snap_txg) { |
155 | dsl_dataset_phys(poa->ds_prev)->ds_unique_bytes += | |
13fe0198 MA |
156 | bp_get_dsize_sync(dp->dp_spa, bp); |
157 | } | |
158 | } else { | |
159 | poa->used += bp_get_dsize_sync(dp->dp_spa, bp); | |
160 | poa->comp += BP_GET_PSIZE(bp); | |
161 | poa->uncomp += BP_GET_UCSIZE(bp); | |
162 | dsl_free_sync(poa->pio, dp, tx->tx_txg, bp); | |
163 | } | |
164 | return (0); | |
165 | } | |
166 | ||
167 | static void | |
168 | process_old_deadlist(dsl_dataset_t *ds, dsl_dataset_t *ds_prev, | |
169 | dsl_dataset_t *ds_next, boolean_t after_branch_point, dmu_tx_t *tx) | |
170 | { | |
171 | struct process_old_arg poa = { 0 }; | |
172 | dsl_pool_t *dp = ds->ds_dir->dd_pool; | |
173 | objset_t *mos = dp->dp_meta_objset; | |
174 | uint64_t deadlist_obj; | |
175 | ||
176 | ASSERT(ds->ds_deadlist.dl_oldfmt); | |
177 | ASSERT(ds_next->ds_deadlist.dl_oldfmt); | |
178 | ||
179 | poa.ds = ds; | |
180 | poa.ds_prev = ds_prev; | |
181 | poa.after_branch_point = after_branch_point; | |
182 | poa.pio = zio_root(dp->dp_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED); | |
183 | VERIFY0(bpobj_iterate(&ds_next->ds_deadlist.dl_bpobj, | |
184 | process_old_cb, &poa, tx)); | |
185 | VERIFY0(zio_wait(poa.pio)); | |
d683ddbb | 186 | ASSERT3U(poa.used, ==, dsl_dataset_phys(ds)->ds_unique_bytes); |
13fe0198 MA |
187 | |
188 | /* change snapused */ | |
189 | dsl_dir_diduse_space(ds->ds_dir, DD_USED_SNAP, | |
190 | -poa.used, -poa.comp, -poa.uncomp, tx); | |
191 | ||
192 | /* swap next's deadlist to our deadlist */ | |
193 | dsl_deadlist_close(&ds->ds_deadlist); | |
194 | dsl_deadlist_close(&ds_next->ds_deadlist); | |
d683ddbb JG |
195 | deadlist_obj = dsl_dataset_phys(ds)->ds_deadlist_obj; |
196 | dsl_dataset_phys(ds)->ds_deadlist_obj = | |
197 | dsl_dataset_phys(ds_next)->ds_deadlist_obj; | |
198 | dsl_dataset_phys(ds_next)->ds_deadlist_obj = deadlist_obj; | |
199 | dsl_deadlist_open(&ds->ds_deadlist, mos, | |
200 | dsl_dataset_phys(ds)->ds_deadlist_obj); | |
13fe0198 | 201 | dsl_deadlist_open(&ds_next->ds_deadlist, mos, |
d683ddbb | 202 | dsl_dataset_phys(ds_next)->ds_deadlist_obj); |
13fe0198 MA |
203 | } |
204 | ||
205 | static void | |
206 | dsl_dataset_remove_clones_key(dsl_dataset_t *ds, uint64_t mintxg, dmu_tx_t *tx) | |
207 | { | |
208 | objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; | |
77831e17 KK |
209 | zap_cursor_t *zc; |
210 | zap_attribute_t *za; | |
13fe0198 MA |
211 | |
212 | /* | |
213 | * If it is the old version, dd_clones doesn't exist so we can't | |
214 | * find the clones, but dsl_deadlist_remove_key() is a no-op so it | |
215 | * doesn't matter. | |
216 | */ | |
d683ddbb | 217 | if (dsl_dir_phys(ds->ds_dir)->dd_clones == 0) |
13fe0198 MA |
218 | return; |
219 | ||
79c76d5b BB |
220 | zc = kmem_alloc(sizeof (zap_cursor_t), KM_SLEEP); |
221 | za = kmem_alloc(sizeof (zap_attribute_t), KM_SLEEP); | |
77831e17 | 222 | |
d683ddbb | 223 | for (zap_cursor_init(zc, mos, dsl_dir_phys(ds->ds_dir)->dd_clones); |
77831e17 KK |
224 | zap_cursor_retrieve(zc, za) == 0; |
225 | zap_cursor_advance(zc)) { | |
13fe0198 MA |
226 | dsl_dataset_t *clone; |
227 | ||
228 | VERIFY0(dsl_dataset_hold_obj(ds->ds_dir->dd_pool, | |
77831e17 | 229 | za->za_first_integer, FTAG, &clone)); |
13fe0198 MA |
230 | if (clone->ds_dir->dd_origin_txg > mintxg) { |
231 | dsl_deadlist_remove_key(&clone->ds_deadlist, | |
232 | mintxg, tx); | |
233 | dsl_dataset_remove_clones_key(clone, mintxg, tx); | |
234 | } | |
235 | dsl_dataset_rele(clone, FTAG); | |
236 | } | |
77831e17 KK |
237 | zap_cursor_fini(zc); |
238 | ||
239 | kmem_free(za, sizeof (zap_attribute_t)); | |
240 | kmem_free(zc, sizeof (zap_cursor_t)); | |
13fe0198 MA |
241 | } |
242 | ||
243 | void | |
244 | dsl_destroy_snapshot_sync_impl(dsl_dataset_t *ds, boolean_t defer, dmu_tx_t *tx) | |
245 | { | |
246 | #ifdef ZFS_DEBUG | |
247 | int err; | |
248 | #endif | |
249 | int after_branch_point = FALSE; | |
250 | dsl_pool_t *dp = ds->ds_dir->dd_pool; | |
251 | objset_t *mos = dp->dp_meta_objset; | |
252 | dsl_dataset_t *ds_prev = NULL; | |
253 | uint64_t obj, old_unique, used = 0, comp = 0, uncomp = 0; | |
254 | dsl_dataset_t *ds_next, *ds_head, *hds; | |
255 | ||
256 | ||
257 | ASSERT(RRW_WRITE_HELD(&dp->dp_config_rwlock)); | |
d683ddbb | 258 | ASSERT3U(dsl_dataset_phys(ds)->ds_bp.blk_birth, <=, tx->tx_txg); |
13fe0198 MA |
259 | ASSERT(refcount_is_zero(&ds->ds_longholds)); |
260 | ||
261 | if (defer && | |
d683ddbb JG |
262 | (ds->ds_userrefs > 0 || |
263 | dsl_dataset_phys(ds)->ds_num_children > 1)) { | |
13fe0198 MA |
264 | ASSERT(spa_version(dp->dp_spa) >= SPA_VERSION_USERREFS); |
265 | dmu_buf_will_dirty(ds->ds_dbuf, tx); | |
d683ddbb | 266 | dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_DEFER_DESTROY; |
13fe0198 MA |
267 | spa_history_log_internal_ds(ds, "defer_destroy", tx, ""); |
268 | return; | |
269 | } | |
270 | ||
d683ddbb | 271 | ASSERT3U(dsl_dataset_phys(ds)->ds_num_children, <=, 1); |
13fe0198 MA |
272 | |
273 | /* We need to log before removing it from the namespace. */ | |
274 | spa_history_log_internal_ds(ds, "destroy", tx, ""); | |
275 | ||
276 | dsl_scan_ds_destroyed(ds, tx); | |
277 | ||
278 | obj = ds->ds_object; | |
279 | ||
d683ddbb | 280 | if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) { |
13fe0198 MA |
281 | ASSERT3P(ds->ds_prev, ==, NULL); |
282 | VERIFY0(dsl_dataset_hold_obj(dp, | |
d683ddbb | 283 | dsl_dataset_phys(ds)->ds_prev_snap_obj, FTAG, &ds_prev)); |
13fe0198 | 284 | after_branch_point = |
d683ddbb | 285 | (dsl_dataset_phys(ds_prev)->ds_next_snap_obj != obj); |
13fe0198 MA |
286 | |
287 | dmu_buf_will_dirty(ds_prev->ds_dbuf, tx); | |
288 | if (after_branch_point && | |
d683ddbb | 289 | dsl_dataset_phys(ds_prev)->ds_next_clones_obj != 0) { |
13fe0198 | 290 | dsl_dataset_remove_from_next_clones(ds_prev, obj, tx); |
d683ddbb | 291 | if (dsl_dataset_phys(ds)->ds_next_snap_obj != 0) { |
13fe0198 | 292 | VERIFY0(zap_add_int(mos, |
d683ddbb JG |
293 | dsl_dataset_phys(ds_prev)-> |
294 | ds_next_clones_obj, | |
295 | dsl_dataset_phys(ds)->ds_next_snap_obj, | |
296 | tx)); | |
13fe0198 MA |
297 | } |
298 | } | |
299 | if (!after_branch_point) { | |
d683ddbb JG |
300 | dsl_dataset_phys(ds_prev)->ds_next_snap_obj = |
301 | dsl_dataset_phys(ds)->ds_next_snap_obj; | |
13fe0198 MA |
302 | } |
303 | } | |
304 | ||
305 | VERIFY0(dsl_dataset_hold_obj(dp, | |
d683ddbb JG |
306 | dsl_dataset_phys(ds)->ds_next_snap_obj, FTAG, &ds_next)); |
307 | ASSERT3U(dsl_dataset_phys(ds_next)->ds_prev_snap_obj, ==, obj); | |
13fe0198 | 308 | |
d683ddbb | 309 | old_unique = dsl_dataset_phys(ds_next)->ds_unique_bytes; |
13fe0198 MA |
310 | |
311 | dmu_buf_will_dirty(ds_next->ds_dbuf, tx); | |
d683ddbb JG |
312 | dsl_dataset_phys(ds_next)->ds_prev_snap_obj = |
313 | dsl_dataset_phys(ds)->ds_prev_snap_obj; | |
314 | dsl_dataset_phys(ds_next)->ds_prev_snap_txg = | |
315 | dsl_dataset_phys(ds)->ds_prev_snap_txg; | |
316 | ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, ==, | |
317 | ds_prev ? dsl_dataset_phys(ds_prev)->ds_creation_txg : 0); | |
13fe0198 MA |
318 | |
319 | if (ds_next->ds_deadlist.dl_oldfmt) { | |
320 | process_old_deadlist(ds, ds_prev, ds_next, | |
321 | after_branch_point, tx); | |
322 | } else { | |
323 | /* Adjust prev's unique space. */ | |
324 | if (ds_prev && !after_branch_point) { | |
325 | dsl_deadlist_space_range(&ds_next->ds_deadlist, | |
d683ddbb JG |
326 | dsl_dataset_phys(ds_prev)->ds_prev_snap_txg, |
327 | dsl_dataset_phys(ds)->ds_prev_snap_txg, | |
13fe0198 | 328 | &used, &comp, &uncomp); |
d683ddbb | 329 | dsl_dataset_phys(ds_prev)->ds_unique_bytes += used; |
13fe0198 MA |
330 | } |
331 | ||
332 | /* Adjust snapused. */ | |
333 | dsl_deadlist_space_range(&ds_next->ds_deadlist, | |
d683ddbb | 334 | dsl_dataset_phys(ds)->ds_prev_snap_txg, UINT64_MAX, |
13fe0198 MA |
335 | &used, &comp, &uncomp); |
336 | dsl_dir_diduse_space(ds->ds_dir, DD_USED_SNAP, | |
337 | -used, -comp, -uncomp, tx); | |
338 | ||
339 | /* Move blocks to be freed to pool's free list. */ | |
340 | dsl_deadlist_move_bpobj(&ds_next->ds_deadlist, | |
d683ddbb | 341 | &dp->dp_free_bpobj, dsl_dataset_phys(ds)->ds_prev_snap_txg, |
13fe0198 MA |
342 | tx); |
343 | dsl_dir_diduse_space(tx->tx_pool->dp_free_dir, | |
344 | DD_USED_HEAD, used, comp, uncomp, tx); | |
345 | ||
346 | /* Merge our deadlist into next's and free it. */ | |
347 | dsl_deadlist_merge(&ds_next->ds_deadlist, | |
d683ddbb | 348 | dsl_dataset_phys(ds)->ds_deadlist_obj, tx); |
13fe0198 MA |
349 | } |
350 | dsl_deadlist_close(&ds->ds_deadlist); | |
d683ddbb | 351 | dsl_deadlist_free(mos, dsl_dataset_phys(ds)->ds_deadlist_obj, tx); |
13fe0198 | 352 | dmu_buf_will_dirty(ds->ds_dbuf, tx); |
d683ddbb | 353 | dsl_dataset_phys(ds)->ds_deadlist_obj = 0; |
13fe0198 MA |
354 | |
355 | /* Collapse range in clone heads */ | |
356 | dsl_dataset_remove_clones_key(ds, | |
d683ddbb | 357 | dsl_dataset_phys(ds)->ds_creation_txg, tx); |
13fe0198 MA |
358 | |
359 | if (dsl_dataset_is_snapshot(ds_next)) { | |
360 | dsl_dataset_t *ds_nextnext; | |
361 | ||
362 | /* | |
363 | * Update next's unique to include blocks which | |
364 | * were previously shared by only this snapshot | |
365 | * and it. Those blocks will be born after the | |
366 | * prev snap and before this snap, and will have | |
367 | * died after the next snap and before the one | |
368 | * after that (ie. be on the snap after next's | |
369 | * deadlist). | |
370 | */ | |
371 | VERIFY0(dsl_dataset_hold_obj(dp, | |
d683ddbb JG |
372 | dsl_dataset_phys(ds_next)->ds_next_snap_obj, |
373 | FTAG, &ds_nextnext)); | |
13fe0198 | 374 | dsl_deadlist_space_range(&ds_nextnext->ds_deadlist, |
d683ddbb JG |
375 | dsl_dataset_phys(ds)->ds_prev_snap_txg, |
376 | dsl_dataset_phys(ds)->ds_creation_txg, | |
13fe0198 | 377 | &used, &comp, &uncomp); |
d683ddbb | 378 | dsl_dataset_phys(ds_next)->ds_unique_bytes += used; |
13fe0198 MA |
379 | dsl_dataset_rele(ds_nextnext, FTAG); |
380 | ASSERT3P(ds_next->ds_prev, ==, NULL); | |
381 | ||
382 | /* Collapse range in this head. */ | |
383 | VERIFY0(dsl_dataset_hold_obj(dp, | |
d683ddbb | 384 | dsl_dir_phys(ds->ds_dir)->dd_head_dataset_obj, FTAG, &hds)); |
13fe0198 | 385 | dsl_deadlist_remove_key(&hds->ds_deadlist, |
d683ddbb | 386 | dsl_dataset_phys(ds)->ds_creation_txg, tx); |
13fe0198 MA |
387 | dsl_dataset_rele(hds, FTAG); |
388 | ||
389 | } else { | |
390 | ASSERT3P(ds_next->ds_prev, ==, ds); | |
391 | dsl_dataset_rele(ds_next->ds_prev, ds_next); | |
392 | ds_next->ds_prev = NULL; | |
393 | if (ds_prev) { | |
394 | VERIFY0(dsl_dataset_hold_obj(dp, | |
d683ddbb | 395 | dsl_dataset_phys(ds)->ds_prev_snap_obj, |
13fe0198 MA |
396 | ds_next, &ds_next->ds_prev)); |
397 | } | |
398 | ||
399 | dsl_dataset_recalc_head_uniq(ds_next); | |
400 | ||
401 | /* | |
402 | * Reduce the amount of our unconsumed refreservation | |
403 | * being charged to our parent by the amount of | |
404 | * new unique data we have gained. | |
405 | */ | |
406 | if (old_unique < ds_next->ds_reserved) { | |
407 | int64_t mrsdelta; | |
408 | uint64_t new_unique = | |
d683ddbb | 409 | dsl_dataset_phys(ds_next)->ds_unique_bytes; |
13fe0198 MA |
410 | |
411 | ASSERT(old_unique <= new_unique); | |
412 | mrsdelta = MIN(new_unique - old_unique, | |
413 | ds_next->ds_reserved - old_unique); | |
414 | dsl_dir_diduse_space(ds->ds_dir, | |
415 | DD_USED_REFRSRV, -mrsdelta, 0, 0, tx); | |
416 | } | |
417 | } | |
418 | dsl_dataset_rele(ds_next, FTAG); | |
419 | ||
420 | /* | |
421 | * This must be done after the dsl_traverse(), because it will | |
422 | * re-open the objset. | |
423 | */ | |
424 | if (ds->ds_objset) { | |
425 | dmu_objset_evict(ds->ds_objset); | |
426 | ds->ds_objset = NULL; | |
427 | } | |
428 | ||
429 | /* remove from snapshot namespace */ | |
d683ddbb | 430 | ASSERT(dsl_dataset_phys(ds)->ds_snapnames_zapobj == 0); |
13fe0198 | 431 | VERIFY0(dsl_dataset_hold_obj(dp, |
d683ddbb | 432 | dsl_dir_phys(ds->ds_dir)->dd_head_dataset_obj, FTAG, &ds_head)); |
13fe0198 MA |
433 | VERIFY0(dsl_dataset_get_snapname(ds)); |
434 | #ifdef ZFS_DEBUG | |
435 | { | |
436 | uint64_t val; | |
437 | ||
438 | err = dsl_dataset_snap_lookup(ds_head, | |
439 | ds->ds_snapname, &val); | |
440 | ASSERT0(err); | |
441 | ASSERT3U(val, ==, obj); | |
442 | } | |
443 | #endif | |
788eb90c | 444 | VERIFY0(dsl_dataset_snap_remove(ds_head, ds->ds_snapname, tx, B_TRUE)); |
13fe0198 MA |
445 | dsl_dataset_rele(ds_head, FTAG); |
446 | ||
447 | if (ds_prev != NULL) | |
448 | dsl_dataset_rele(ds_prev, FTAG); | |
449 | ||
450 | spa_prop_clear_bootfs(dp->dp_spa, ds->ds_object, tx); | |
451 | ||
d683ddbb | 452 | if (dsl_dataset_phys(ds)->ds_next_clones_obj != 0) { |
13fe0198 MA |
453 | ASSERTV(uint64_t count); |
454 | ASSERT0(zap_count(mos, | |
d683ddbb JG |
455 | dsl_dataset_phys(ds)->ds_next_clones_obj, &count) && |
456 | count == 0); | |
13fe0198 | 457 | VERIFY0(dmu_object_free(mos, |
d683ddbb | 458 | dsl_dataset_phys(ds)->ds_next_clones_obj, tx)); |
13fe0198 | 459 | } |
d683ddbb JG |
460 | if (dsl_dataset_phys(ds)->ds_props_obj != 0) |
461 | VERIFY0(zap_destroy(mos, dsl_dataset_phys(ds)->ds_props_obj, | |
462 | tx)); | |
463 | if (dsl_dataset_phys(ds)->ds_userrefs_obj != 0) | |
464 | VERIFY0(zap_destroy(mos, dsl_dataset_phys(ds)->ds_userrefs_obj, | |
465 | tx)); | |
13fe0198 MA |
466 | dsl_dir_rele(ds->ds_dir, ds); |
467 | ds->ds_dir = NULL; | |
fa86b5db | 468 | dmu_object_free_zapified(mos, obj, tx); |
13fe0198 MA |
469 | } |
470 | ||
471 | static void | |
472 | dsl_destroy_snapshot_sync(void *arg, dmu_tx_t *tx) | |
473 | { | |
474 | dmu_snapshots_destroy_arg_t *dsda = arg; | |
475 | dsl_pool_t *dp = dmu_tx_pool(tx); | |
476 | nvpair_t *pair; | |
477 | ||
478 | for (pair = nvlist_next_nvpair(dsda->dsda_successful_snaps, NULL); | |
479 | pair != NULL; | |
480 | pair = nvlist_next_nvpair(dsda->dsda_successful_snaps, pair)) { | |
481 | dsl_dataset_t *ds; | |
482 | ||
483 | VERIFY0(dsl_dataset_hold(dp, nvpair_name(pair), FTAG, &ds)); | |
484 | ||
485 | dsl_destroy_snapshot_sync_impl(ds, dsda->dsda_defer, tx); | |
486 | dsl_dataset_rele(ds, FTAG); | |
487 | } | |
488 | } | |
489 | ||
490 | /* | |
491 | * The semantics of this function are described in the comment above | |
492 | * lzc_destroy_snaps(). To summarize: | |
493 | * | |
494 | * The snapshots must all be in the same pool. | |
495 | * | |
496 | * Snapshots that don't exist will be silently ignored (considered to be | |
497 | * "already deleted"). | |
498 | * | |
499 | * On success, all snaps will be destroyed and this will return 0. | |
500 | * On failure, no snaps will be destroyed, the errlist will be filled in, | |
501 | * and this will return an errno. | |
502 | */ | |
503 | int | |
504 | dsl_destroy_snapshots_nvl(nvlist_t *snaps, boolean_t defer, | |
505 | nvlist_t *errlist) | |
506 | { | |
507 | dmu_snapshots_destroy_arg_t dsda; | |
508 | int error; | |
509 | nvpair_t *pair; | |
510 | ||
511 | pair = nvlist_next_nvpair(snaps, NULL); | |
512 | if (pair == NULL) | |
513 | return (0); | |
514 | ||
515 | dsda.dsda_snaps = snaps; | |
d1d7e268 | 516 | VERIFY0(nvlist_alloc(&dsda.dsda_successful_snaps, |
79c76d5b | 517 | NV_UNIQUE_NAME, KM_SLEEP)); |
13fe0198 MA |
518 | dsda.dsda_defer = defer; |
519 | dsda.dsda_errlist = errlist; | |
520 | ||
521 | error = dsl_sync_task(nvpair_name(pair), | |
522 | dsl_destroy_snapshot_check, dsl_destroy_snapshot_sync, | |
523 | &dsda, 0); | |
524 | fnvlist_free(dsda.dsda_successful_snaps); | |
525 | ||
526 | return (error); | |
527 | } | |
528 | ||
529 | int | |
530 | dsl_destroy_snapshot(const char *name, boolean_t defer) | |
531 | { | |
532 | int error; | |
79c76d5b BB |
533 | nvlist_t *nvl = fnvlist_alloc(); |
534 | nvlist_t *errlist = fnvlist_alloc(); | |
13fe0198 MA |
535 | |
536 | fnvlist_add_boolean(nvl, name); | |
537 | error = dsl_destroy_snapshots_nvl(nvl, defer, errlist); | |
538 | fnvlist_free(errlist); | |
539 | fnvlist_free(nvl); | |
540 | return (error); | |
541 | } | |
542 | ||
543 | struct killarg { | |
544 | dsl_dataset_t *ds; | |
545 | dmu_tx_t *tx; | |
546 | }; | |
547 | ||
548 | /* ARGSUSED */ | |
549 | static int | |
550 | kill_blkptr(spa_t *spa, zilog_t *zilog, const blkptr_t *bp, | |
5dbd68a3 | 551 | const zbookmark_phys_t *zb, const dnode_phys_t *dnp, void *arg) |
13fe0198 MA |
552 | { |
553 | struct killarg *ka = arg; | |
554 | dmu_tx_t *tx = ka->tx; | |
555 | ||
9b67f605 | 556 | if (BP_IS_HOLE(bp) || BP_IS_EMBEDDED(bp)) |
13fe0198 MA |
557 | return (0); |
558 | ||
559 | if (zb->zb_level == ZB_ZIL_LEVEL) { | |
560 | ASSERT(zilog != NULL); | |
561 | /* | |
562 | * It's a block in the intent log. It has no | |
563 | * accounting, so just free it. | |
564 | */ | |
565 | dsl_free(ka->tx->tx_pool, ka->tx->tx_txg, bp); | |
566 | } else { | |
567 | ASSERT(zilog == NULL); | |
d683ddbb JG |
568 | ASSERT3U(bp->blk_birth, >, |
569 | dsl_dataset_phys(ka->ds)->ds_prev_snap_txg); | |
13fe0198 MA |
570 | (void) dsl_dataset_block_kill(ka->ds, bp, tx, B_FALSE); |
571 | } | |
572 | ||
573 | return (0); | |
574 | } | |
575 | ||
576 | static void | |
577 | old_synchronous_dataset_destroy(dsl_dataset_t *ds, dmu_tx_t *tx) | |
578 | { | |
579 | struct killarg ka; | |
580 | ||
581 | /* | |
582 | * Free everything that we point to (that's born after | |
583 | * the previous snapshot, if we are a clone) | |
584 | * | |
585 | * NB: this should be very quick, because we already | |
586 | * freed all the objects in open context. | |
587 | */ | |
588 | ka.ds = ds; | |
589 | ka.tx = tx; | |
590 | VERIFY0(traverse_dataset(ds, | |
d683ddbb | 591 | dsl_dataset_phys(ds)->ds_prev_snap_txg, TRAVERSE_POST, |
13fe0198 | 592 | kill_blkptr, &ka)); |
d683ddbb JG |
593 | ASSERT(!DS_UNIQUE_IS_ACCURATE(ds) || |
594 | dsl_dataset_phys(ds)->ds_unique_bytes == 0); | |
13fe0198 MA |
595 | } |
596 | ||
597 | typedef struct dsl_destroy_head_arg { | |
598 | const char *ddha_name; | |
599 | } dsl_destroy_head_arg_t; | |
600 | ||
601 | int | |
602 | dsl_destroy_head_check_impl(dsl_dataset_t *ds, int expected_holds) | |
603 | { | |
604 | int error; | |
605 | uint64_t count; | |
606 | objset_t *mos; | |
607 | ||
9b67f605 | 608 | ASSERT(!dsl_dataset_is_snapshot(ds)); |
13fe0198 | 609 | if (dsl_dataset_is_snapshot(ds)) |
2e528b49 | 610 | return (SET_ERROR(EINVAL)); |
13fe0198 MA |
611 | |
612 | if (refcount_count(&ds->ds_longholds) != expected_holds) | |
2e528b49 | 613 | return (SET_ERROR(EBUSY)); |
13fe0198 MA |
614 | |
615 | mos = ds->ds_dir->dd_pool->dp_meta_objset; | |
616 | ||
617 | /* | |
618 | * Can't delete a head dataset if there are snapshots of it. | |
619 | * (Except if the only snapshots are from the branch we cloned | |
620 | * from.) | |
621 | */ | |
622 | if (ds->ds_prev != NULL && | |
d683ddbb | 623 | dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj == ds->ds_object) |
2e528b49 | 624 | return (SET_ERROR(EBUSY)); |
13fe0198 MA |
625 | |
626 | /* | |
627 | * Can't delete if there are children of this fs. | |
628 | */ | |
629 | error = zap_count(mos, | |
d683ddbb | 630 | dsl_dir_phys(ds->ds_dir)->dd_child_dir_zapobj, &count); |
13fe0198 MA |
631 | if (error != 0) |
632 | return (error); | |
633 | if (count != 0) | |
2e528b49 | 634 | return (SET_ERROR(EEXIST)); |
13fe0198 MA |
635 | |
636 | if (dsl_dir_is_clone(ds->ds_dir) && DS_IS_DEFER_DESTROY(ds->ds_prev) && | |
d683ddbb | 637 | dsl_dataset_phys(ds->ds_prev)->ds_num_children == 2 && |
13fe0198 MA |
638 | ds->ds_prev->ds_userrefs == 0) { |
639 | /* We need to remove the origin snapshot as well. */ | |
640 | if (!refcount_is_zero(&ds->ds_prev->ds_longholds)) | |
2e528b49 | 641 | return (SET_ERROR(EBUSY)); |
13fe0198 MA |
642 | } |
643 | return (0); | |
644 | } | |
645 | ||
646 | static int | |
647 | dsl_destroy_head_check(void *arg, dmu_tx_t *tx) | |
648 | { | |
649 | dsl_destroy_head_arg_t *ddha = arg; | |
650 | dsl_pool_t *dp = dmu_tx_pool(tx); | |
651 | dsl_dataset_t *ds; | |
652 | int error; | |
653 | ||
654 | error = dsl_dataset_hold(dp, ddha->ddha_name, FTAG, &ds); | |
655 | if (error != 0) | |
656 | return (error); | |
657 | ||
658 | error = dsl_destroy_head_check_impl(ds, 0); | |
659 | dsl_dataset_rele(ds, FTAG); | |
660 | return (error); | |
661 | } | |
662 | ||
663 | static void | |
664 | dsl_dir_destroy_sync(uint64_t ddobj, dmu_tx_t *tx) | |
665 | { | |
666 | dsl_dir_t *dd; | |
667 | dsl_pool_t *dp = dmu_tx_pool(tx); | |
668 | objset_t *mos = dp->dp_meta_objset; | |
669 | dd_used_t t; | |
670 | ||
671 | ASSERT(RRW_WRITE_HELD(&dmu_tx_pool(tx)->dp_config_rwlock)); | |
672 | ||
673 | VERIFY0(dsl_dir_hold_obj(dp, ddobj, NULL, FTAG, &dd)); | |
674 | ||
d683ddbb | 675 | ASSERT0(dsl_dir_phys(dd)->dd_head_dataset_obj); |
13fe0198 | 676 | |
788eb90c JJ |
677 | /* |
678 | * Decrement the filesystem count for all parent filesystems. | |
679 | * | |
680 | * When we receive an incremental stream into a filesystem that already | |
681 | * exists, a temporary clone is created. We never count this temporary | |
682 | * clone, whose name begins with a '%'. | |
683 | */ | |
684 | if (dd->dd_myname[0] != '%' && dd->dd_parent != NULL) | |
685 | dsl_fs_ss_count_adjust(dd->dd_parent, -1, | |
686 | DD_FIELD_FILESYSTEM_COUNT, tx); | |
687 | ||
13fe0198 MA |
688 | /* |
689 | * Remove our reservation. The impl() routine avoids setting the | |
690 | * actual property, which would require the (already destroyed) ds. | |
691 | */ | |
692 | dsl_dir_set_reservation_sync_impl(dd, 0, tx); | |
693 | ||
d683ddbb JG |
694 | ASSERT0(dsl_dir_phys(dd)->dd_used_bytes); |
695 | ASSERT0(dsl_dir_phys(dd)->dd_reserved); | |
13fe0198 | 696 | for (t = 0; t < DD_USED_NUM; t++) |
d683ddbb | 697 | ASSERT0(dsl_dir_phys(dd)->dd_used_breakdown[t]); |
13fe0198 | 698 | |
d683ddbb JG |
699 | VERIFY0(zap_destroy(mos, dsl_dir_phys(dd)->dd_child_dir_zapobj, tx)); |
700 | VERIFY0(zap_destroy(mos, dsl_dir_phys(dd)->dd_props_zapobj, tx)); | |
701 | VERIFY0(dsl_deleg_destroy(mos, dsl_dir_phys(dd)->dd_deleg_zapobj, tx)); | |
13fe0198 | 702 | VERIFY0(zap_remove(mos, |
d683ddbb JG |
703 | dsl_dir_phys(dd->dd_parent)->dd_child_dir_zapobj, |
704 | dd->dd_myname, tx)); | |
13fe0198 MA |
705 | |
706 | dsl_dir_rele(dd, FTAG); | |
fa86b5db | 707 | dmu_object_free_zapified(mos, ddobj, tx); |
13fe0198 MA |
708 | } |
709 | ||
710 | void | |
711 | dsl_destroy_head_sync_impl(dsl_dataset_t *ds, dmu_tx_t *tx) | |
712 | { | |
713 | dsl_pool_t *dp = dmu_tx_pool(tx); | |
714 | objset_t *mos = dp->dp_meta_objset; | |
715 | uint64_t obj, ddobj, prevobj = 0; | |
716 | boolean_t rmorigin; | |
13fe0198 MA |
717 | objset_t *os; |
718 | ||
d683ddbb | 719 | ASSERT3U(dsl_dataset_phys(ds)->ds_num_children, <=, 1); |
13fe0198 | 720 | ASSERT(ds->ds_prev == NULL || |
d683ddbb JG |
721 | dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj != ds->ds_object); |
722 | ASSERT3U(dsl_dataset_phys(ds)->ds_bp.blk_birth, <=, tx->tx_txg); | |
13fe0198 MA |
723 | ASSERT(RRW_WRITE_HELD(&dp->dp_config_rwlock)); |
724 | ||
725 | /* We need to log before removing it from the namespace. */ | |
726 | spa_history_log_internal_ds(ds, "destroy", tx, ""); | |
727 | ||
728 | rmorigin = (dsl_dir_is_clone(ds->ds_dir) && | |
729 | DS_IS_DEFER_DESTROY(ds->ds_prev) && | |
d683ddbb | 730 | dsl_dataset_phys(ds->ds_prev)->ds_num_children == 2 && |
13fe0198 MA |
731 | ds->ds_prev->ds_userrefs == 0); |
732 | ||
9b67f605 | 733 | /* Remove our reservation. */ |
13fe0198 MA |
734 | if (ds->ds_reserved != 0) { |
735 | dsl_dataset_set_refreservation_sync_impl(ds, | |
736 | (ZPROP_SRC_NONE | ZPROP_SRC_LOCAL | ZPROP_SRC_RECEIVED), | |
737 | 0, tx); | |
738 | ASSERT0(ds->ds_reserved); | |
739 | } | |
740 | ||
741 | dsl_scan_ds_destroyed(ds, tx); | |
742 | ||
743 | obj = ds->ds_object; | |
744 | ||
d683ddbb | 745 | if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) { |
13fe0198 MA |
746 | /* This is a clone */ |
747 | ASSERT(ds->ds_prev != NULL); | |
d683ddbb JG |
748 | ASSERT3U(dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj, !=, |
749 | obj); | |
750 | ASSERT0(dsl_dataset_phys(ds)->ds_next_snap_obj); | |
13fe0198 MA |
751 | |
752 | dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); | |
d683ddbb | 753 | if (dsl_dataset_phys(ds->ds_prev)->ds_next_clones_obj != 0) { |
13fe0198 MA |
754 | dsl_dataset_remove_from_next_clones(ds->ds_prev, |
755 | obj, tx); | |
756 | } | |
757 | ||
d683ddbb JG |
758 | ASSERT3U(dsl_dataset_phys(ds->ds_prev)->ds_num_children, >, 1); |
759 | dsl_dataset_phys(ds->ds_prev)->ds_num_children--; | |
13fe0198 MA |
760 | } |
761 | ||
13fe0198 MA |
762 | /* |
763 | * Destroy the deadlist. Unless it's a clone, the | |
764 | * deadlist should be empty. (If it's a clone, it's | |
765 | * safe to ignore the deadlist contents.) | |
766 | */ | |
767 | dsl_deadlist_close(&ds->ds_deadlist); | |
d683ddbb | 768 | dsl_deadlist_free(mos, dsl_dataset_phys(ds)->ds_deadlist_obj, tx); |
13fe0198 | 769 | dmu_buf_will_dirty(ds->ds_dbuf, tx); |
d683ddbb | 770 | dsl_dataset_phys(ds)->ds_deadlist_obj = 0; |
13fe0198 MA |
771 | |
772 | VERIFY0(dmu_objset_from_ds(ds, &os)); | |
773 | ||
fa86b5db | 774 | if (!spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_ASYNC_DESTROY)) { |
13fe0198 MA |
775 | old_synchronous_dataset_destroy(ds, tx); |
776 | } else { | |
777 | /* | |
778 | * Move the bptree into the pool's list of trees to | |
779 | * clean up and update space accounting information. | |
780 | */ | |
781 | uint64_t used, comp, uncomp; | |
782 | ||
783 | zil_destroy_sync(dmu_objset_zil(os), tx); | |
784 | ||
fa86b5db MA |
785 | if (!spa_feature_is_active(dp->dp_spa, |
786 | SPA_FEATURE_ASYNC_DESTROY)) { | |
2696dfaf | 787 | dsl_scan_t *scn = dp->dp_scan; |
fa86b5db MA |
788 | spa_feature_incr(dp->dp_spa, SPA_FEATURE_ASYNC_DESTROY, |
789 | tx); | |
13fe0198 MA |
790 | dp->dp_bptree_obj = bptree_alloc(mos, tx); |
791 | VERIFY0(zap_add(mos, | |
792 | DMU_POOL_DIRECTORY_OBJECT, | |
793 | DMU_POOL_BPTREE_OBJ, sizeof (uint64_t), 1, | |
794 | &dp->dp_bptree_obj, tx)); | |
2696dfaf GW |
795 | ASSERT(!scn->scn_async_destroying); |
796 | scn->scn_async_destroying = B_TRUE; | |
13fe0198 MA |
797 | } |
798 | ||
d683ddbb JG |
799 | used = dsl_dir_phys(ds->ds_dir)->dd_used_bytes; |
800 | comp = dsl_dir_phys(ds->ds_dir)->dd_compressed_bytes; | |
801 | uncomp = dsl_dir_phys(ds->ds_dir)->dd_uncompressed_bytes; | |
13fe0198 MA |
802 | |
803 | ASSERT(!DS_UNIQUE_IS_ACCURATE(ds) || | |
d683ddbb | 804 | dsl_dataset_phys(ds)->ds_unique_bytes == used); |
13fe0198 MA |
805 | |
806 | bptree_add(mos, dp->dp_bptree_obj, | |
d683ddbb JG |
807 | &dsl_dataset_phys(ds)->ds_bp, |
808 | dsl_dataset_phys(ds)->ds_prev_snap_txg, | |
13fe0198 MA |
809 | used, comp, uncomp, tx); |
810 | dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD, | |
811 | -used, -comp, -uncomp, tx); | |
812 | dsl_dir_diduse_space(dp->dp_free_dir, DD_USED_HEAD, | |
813 | used, comp, uncomp, tx); | |
814 | } | |
815 | ||
816 | if (ds->ds_prev != NULL) { | |
817 | if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { | |
818 | VERIFY0(zap_remove_int(mos, | |
d683ddbb | 819 | dsl_dir_phys(ds->ds_prev->ds_dir)->dd_clones, |
13fe0198 MA |
820 | ds->ds_object, tx)); |
821 | } | |
822 | prevobj = ds->ds_prev->ds_object; | |
823 | dsl_dataset_rele(ds->ds_prev, ds); | |
824 | ds->ds_prev = NULL; | |
825 | } | |
826 | ||
827 | /* | |
828 | * This must be done after the dsl_traverse(), because it will | |
829 | * re-open the objset. | |
830 | */ | |
831 | if (ds->ds_objset) { | |
832 | dmu_objset_evict(ds->ds_objset); | |
833 | ds->ds_objset = NULL; | |
834 | } | |
835 | ||
836 | /* Erase the link in the dir */ | |
837 | dmu_buf_will_dirty(ds->ds_dir->dd_dbuf, tx); | |
d683ddbb | 838 | dsl_dir_phys(ds->ds_dir)->dd_head_dataset_obj = 0; |
13fe0198 | 839 | ddobj = ds->ds_dir->dd_object; |
d683ddbb JG |
840 | ASSERT(dsl_dataset_phys(ds)->ds_snapnames_zapobj != 0); |
841 | VERIFY0(zap_destroy(mos, | |
842 | dsl_dataset_phys(ds)->ds_snapnames_zapobj, tx)); | |
13fe0198 | 843 | |
da536844 | 844 | if (ds->ds_bookmarks != 0) { |
d683ddbb | 845 | VERIFY0(zap_destroy(mos, ds->ds_bookmarks, tx)); |
da536844 MA |
846 | spa_feature_decr(dp->dp_spa, SPA_FEATURE_BOOKMARKS, tx); |
847 | } | |
848 | ||
13fe0198 MA |
849 | spa_prop_clear_bootfs(dp->dp_spa, ds->ds_object, tx); |
850 | ||
d683ddbb JG |
851 | ASSERT0(dsl_dataset_phys(ds)->ds_next_clones_obj); |
852 | ASSERT0(dsl_dataset_phys(ds)->ds_props_obj); | |
853 | ASSERT0(dsl_dataset_phys(ds)->ds_userrefs_obj); | |
13fe0198 MA |
854 | dsl_dir_rele(ds->ds_dir, ds); |
855 | ds->ds_dir = NULL; | |
fa86b5db | 856 | dmu_object_free_zapified(mos, obj, tx); |
13fe0198 MA |
857 | |
858 | dsl_dir_destroy_sync(ddobj, tx); | |
859 | ||
860 | if (rmorigin) { | |
861 | dsl_dataset_t *prev; | |
862 | VERIFY0(dsl_dataset_hold_obj(dp, prevobj, FTAG, &prev)); | |
863 | dsl_destroy_snapshot_sync_impl(prev, B_FALSE, tx); | |
864 | dsl_dataset_rele(prev, FTAG); | |
865 | } | |
866 | } | |
867 | ||
868 | static void | |
869 | dsl_destroy_head_sync(void *arg, dmu_tx_t *tx) | |
870 | { | |
871 | dsl_destroy_head_arg_t *ddha = arg; | |
872 | dsl_pool_t *dp = dmu_tx_pool(tx); | |
873 | dsl_dataset_t *ds; | |
874 | ||
875 | VERIFY0(dsl_dataset_hold(dp, ddha->ddha_name, FTAG, &ds)); | |
876 | dsl_destroy_head_sync_impl(ds, tx); | |
877 | dsl_dataset_rele(ds, FTAG); | |
878 | } | |
879 | ||
880 | static void | |
881 | dsl_destroy_head_begin_sync(void *arg, dmu_tx_t *tx) | |
882 | { | |
883 | dsl_destroy_head_arg_t *ddha = arg; | |
884 | dsl_pool_t *dp = dmu_tx_pool(tx); | |
885 | dsl_dataset_t *ds; | |
886 | ||
887 | VERIFY0(dsl_dataset_hold(dp, ddha->ddha_name, FTAG, &ds)); | |
888 | ||
889 | /* Mark it as inconsistent on-disk, in case we crash */ | |
890 | dmu_buf_will_dirty(ds->ds_dbuf, tx); | |
d683ddbb | 891 | dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_INCONSISTENT; |
13fe0198 MA |
892 | |
893 | spa_history_log_internal_ds(ds, "destroy begin", tx, ""); | |
894 | dsl_dataset_rele(ds, FTAG); | |
895 | } | |
896 | ||
897 | int | |
898 | dsl_destroy_head(const char *name) | |
899 | { | |
900 | dsl_destroy_head_arg_t ddha; | |
901 | int error; | |
902 | spa_t *spa; | |
903 | boolean_t isenabled; | |
904 | ||
905 | #ifdef _KERNEL | |
906 | zfs_destroy_unmount_origin(name); | |
907 | #endif | |
908 | ||
909 | error = spa_open(name, &spa, FTAG); | |
910 | if (error != 0) | |
911 | return (error); | |
fa86b5db | 912 | isenabled = spa_feature_is_enabled(spa, SPA_FEATURE_ASYNC_DESTROY); |
13fe0198 MA |
913 | spa_close(spa, FTAG); |
914 | ||
915 | ddha.ddha_name = name; | |
916 | ||
917 | if (!isenabled) { | |
918 | objset_t *os; | |
919 | ||
920 | error = dsl_sync_task(name, dsl_destroy_head_check, | |
921 | dsl_destroy_head_begin_sync, &ddha, 0); | |
922 | if (error != 0) | |
923 | return (error); | |
924 | ||
925 | /* | |
926 | * Head deletion is processed in one txg on old pools; | |
927 | * remove the objects from open context so that the txg sync | |
928 | * is not too long. | |
929 | */ | |
930 | error = dmu_objset_own(name, DMU_OST_ANY, B_FALSE, FTAG, &os); | |
931 | if (error == 0) { | |
932 | uint64_t obj; | |
933 | uint64_t prev_snap_txg = | |
d683ddbb JG |
934 | dsl_dataset_phys(dmu_objset_ds(os))-> |
935 | ds_prev_snap_txg; | |
13fe0198 MA |
936 | for (obj = 0; error == 0; |
937 | error = dmu_object_next(os, &obj, FALSE, | |
938 | prev_snap_txg)) | |
b663a23d | 939 | (void) dmu_free_long_object(os, obj); |
13fe0198 MA |
940 | /* sync out all frees */ |
941 | txg_wait_synced(dmu_objset_pool(os), 0); | |
942 | dmu_objset_disown(os, FTAG); | |
943 | } | |
944 | } | |
945 | ||
946 | return (dsl_sync_task(name, dsl_destroy_head_check, | |
947 | dsl_destroy_head_sync, &ddha, 0)); | |
948 | } | |
949 | ||
950 | /* | |
951 | * Note, this function is used as the callback for dmu_objset_find(). We | |
952 | * always return 0 so that we will continue to find and process | |
953 | * inconsistent datasets, even if we encounter an error trying to | |
954 | * process one of them. | |
955 | */ | |
956 | /* ARGSUSED */ | |
957 | int | |
958 | dsl_destroy_inconsistent(const char *dsname, void *arg) | |
959 | { | |
960 | objset_t *os; | |
961 | ||
962 | if (dmu_objset_hold(dsname, FTAG, &os) == 0) { | |
963 | boolean_t inconsistent = DS_IS_INCONSISTENT(dmu_objset_ds(os)); | |
964 | dmu_objset_rele(os, FTAG); | |
965 | if (inconsistent) | |
966 | (void) dsl_destroy_head(dsname); | |
967 | } | |
968 | return (0); | |
969 | } | |
970 | ||
971 | ||
972 | #if defined(_KERNEL) && defined(HAVE_SPL) | |
973 | EXPORT_SYMBOL(dsl_destroy_head); | |
974 | EXPORT_SYMBOL(dsl_destroy_head_sync_impl); | |
975 | EXPORT_SYMBOL(dsl_dataset_user_hold_check_one); | |
976 | EXPORT_SYMBOL(dsl_destroy_snapshot_sync_impl); | |
977 | EXPORT_SYMBOL(dsl_destroy_inconsistent); | |
978 | EXPORT_SYMBOL(dsl_dataset_user_release_tmp); | |
979 | EXPORT_SYMBOL(dsl_destroy_head_check_impl); | |
980 | #endif |