]>
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 | { | |
0c66c32d | 54 | if (!ds->ds_is_snapshot) |
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 | ||
f1512ee6 MA |
280 | if (ds->ds_large_blocks) { |
281 | ASSERT0(zap_contains(mos, obj, DS_FIELD_LARGE_BLOCKS)); | |
282 | spa_feature_decr(dp->dp_spa, SPA_FEATURE_LARGE_BLOCKS, tx); | |
283 | } | |
d683ddbb | 284 | if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) { |
13fe0198 MA |
285 | ASSERT3P(ds->ds_prev, ==, NULL); |
286 | VERIFY0(dsl_dataset_hold_obj(dp, | |
d683ddbb | 287 | dsl_dataset_phys(ds)->ds_prev_snap_obj, FTAG, &ds_prev)); |
13fe0198 | 288 | after_branch_point = |
d683ddbb | 289 | (dsl_dataset_phys(ds_prev)->ds_next_snap_obj != obj); |
13fe0198 MA |
290 | |
291 | dmu_buf_will_dirty(ds_prev->ds_dbuf, tx); | |
292 | if (after_branch_point && | |
d683ddbb | 293 | dsl_dataset_phys(ds_prev)->ds_next_clones_obj != 0) { |
13fe0198 | 294 | dsl_dataset_remove_from_next_clones(ds_prev, obj, tx); |
d683ddbb | 295 | if (dsl_dataset_phys(ds)->ds_next_snap_obj != 0) { |
13fe0198 | 296 | VERIFY0(zap_add_int(mos, |
d683ddbb JG |
297 | dsl_dataset_phys(ds_prev)-> |
298 | ds_next_clones_obj, | |
299 | dsl_dataset_phys(ds)->ds_next_snap_obj, | |
300 | tx)); | |
13fe0198 MA |
301 | } |
302 | } | |
303 | if (!after_branch_point) { | |
d683ddbb JG |
304 | dsl_dataset_phys(ds_prev)->ds_next_snap_obj = |
305 | dsl_dataset_phys(ds)->ds_next_snap_obj; | |
13fe0198 MA |
306 | } |
307 | } | |
308 | ||
309 | VERIFY0(dsl_dataset_hold_obj(dp, | |
d683ddbb JG |
310 | dsl_dataset_phys(ds)->ds_next_snap_obj, FTAG, &ds_next)); |
311 | ASSERT3U(dsl_dataset_phys(ds_next)->ds_prev_snap_obj, ==, obj); | |
13fe0198 | 312 | |
d683ddbb | 313 | old_unique = dsl_dataset_phys(ds_next)->ds_unique_bytes; |
13fe0198 MA |
314 | |
315 | dmu_buf_will_dirty(ds_next->ds_dbuf, tx); | |
d683ddbb JG |
316 | dsl_dataset_phys(ds_next)->ds_prev_snap_obj = |
317 | dsl_dataset_phys(ds)->ds_prev_snap_obj; | |
318 | dsl_dataset_phys(ds_next)->ds_prev_snap_txg = | |
319 | dsl_dataset_phys(ds)->ds_prev_snap_txg; | |
320 | ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, ==, | |
321 | ds_prev ? dsl_dataset_phys(ds_prev)->ds_creation_txg : 0); | |
13fe0198 MA |
322 | |
323 | if (ds_next->ds_deadlist.dl_oldfmt) { | |
324 | process_old_deadlist(ds, ds_prev, ds_next, | |
325 | after_branch_point, tx); | |
326 | } else { | |
327 | /* Adjust prev's unique space. */ | |
328 | if (ds_prev && !after_branch_point) { | |
329 | dsl_deadlist_space_range(&ds_next->ds_deadlist, | |
d683ddbb JG |
330 | dsl_dataset_phys(ds_prev)->ds_prev_snap_txg, |
331 | dsl_dataset_phys(ds)->ds_prev_snap_txg, | |
13fe0198 | 332 | &used, &comp, &uncomp); |
d683ddbb | 333 | dsl_dataset_phys(ds_prev)->ds_unique_bytes += used; |
13fe0198 MA |
334 | } |
335 | ||
336 | /* Adjust snapused. */ | |
337 | dsl_deadlist_space_range(&ds_next->ds_deadlist, | |
d683ddbb | 338 | dsl_dataset_phys(ds)->ds_prev_snap_txg, UINT64_MAX, |
13fe0198 MA |
339 | &used, &comp, &uncomp); |
340 | dsl_dir_diduse_space(ds->ds_dir, DD_USED_SNAP, | |
341 | -used, -comp, -uncomp, tx); | |
342 | ||
343 | /* Move blocks to be freed to pool's free list. */ | |
344 | dsl_deadlist_move_bpobj(&ds_next->ds_deadlist, | |
d683ddbb | 345 | &dp->dp_free_bpobj, dsl_dataset_phys(ds)->ds_prev_snap_txg, |
13fe0198 MA |
346 | tx); |
347 | dsl_dir_diduse_space(tx->tx_pool->dp_free_dir, | |
348 | DD_USED_HEAD, used, comp, uncomp, tx); | |
349 | ||
350 | /* Merge our deadlist into next's and free it. */ | |
351 | dsl_deadlist_merge(&ds_next->ds_deadlist, | |
d683ddbb | 352 | dsl_dataset_phys(ds)->ds_deadlist_obj, tx); |
13fe0198 MA |
353 | } |
354 | dsl_deadlist_close(&ds->ds_deadlist); | |
d683ddbb | 355 | dsl_deadlist_free(mos, dsl_dataset_phys(ds)->ds_deadlist_obj, tx); |
13fe0198 | 356 | dmu_buf_will_dirty(ds->ds_dbuf, tx); |
d683ddbb | 357 | dsl_dataset_phys(ds)->ds_deadlist_obj = 0; |
13fe0198 MA |
358 | |
359 | /* Collapse range in clone heads */ | |
360 | dsl_dataset_remove_clones_key(ds, | |
d683ddbb | 361 | dsl_dataset_phys(ds)->ds_creation_txg, tx); |
13fe0198 | 362 | |
0c66c32d | 363 | if (ds_next->ds_is_snapshot) { |
13fe0198 MA |
364 | dsl_dataset_t *ds_nextnext; |
365 | ||
366 | /* | |
367 | * Update next's unique to include blocks which | |
368 | * were previously shared by only this snapshot | |
369 | * and it. Those blocks will be born after the | |
370 | * prev snap and before this snap, and will have | |
371 | * died after the next snap and before the one | |
372 | * after that (ie. be on the snap after next's | |
373 | * deadlist). | |
374 | */ | |
375 | VERIFY0(dsl_dataset_hold_obj(dp, | |
d683ddbb JG |
376 | dsl_dataset_phys(ds_next)->ds_next_snap_obj, |
377 | FTAG, &ds_nextnext)); | |
13fe0198 | 378 | dsl_deadlist_space_range(&ds_nextnext->ds_deadlist, |
d683ddbb JG |
379 | dsl_dataset_phys(ds)->ds_prev_snap_txg, |
380 | dsl_dataset_phys(ds)->ds_creation_txg, | |
13fe0198 | 381 | &used, &comp, &uncomp); |
d683ddbb | 382 | dsl_dataset_phys(ds_next)->ds_unique_bytes += used; |
13fe0198 MA |
383 | dsl_dataset_rele(ds_nextnext, FTAG); |
384 | ASSERT3P(ds_next->ds_prev, ==, NULL); | |
385 | ||
386 | /* Collapse range in this head. */ | |
387 | VERIFY0(dsl_dataset_hold_obj(dp, | |
d683ddbb | 388 | dsl_dir_phys(ds->ds_dir)->dd_head_dataset_obj, FTAG, &hds)); |
13fe0198 | 389 | dsl_deadlist_remove_key(&hds->ds_deadlist, |
d683ddbb | 390 | dsl_dataset_phys(ds)->ds_creation_txg, tx); |
13fe0198 MA |
391 | dsl_dataset_rele(hds, FTAG); |
392 | ||
393 | } else { | |
394 | ASSERT3P(ds_next->ds_prev, ==, ds); | |
395 | dsl_dataset_rele(ds_next->ds_prev, ds_next); | |
396 | ds_next->ds_prev = NULL; | |
397 | if (ds_prev) { | |
398 | VERIFY0(dsl_dataset_hold_obj(dp, | |
d683ddbb | 399 | dsl_dataset_phys(ds)->ds_prev_snap_obj, |
13fe0198 MA |
400 | ds_next, &ds_next->ds_prev)); |
401 | } | |
402 | ||
403 | dsl_dataset_recalc_head_uniq(ds_next); | |
404 | ||
405 | /* | |
406 | * Reduce the amount of our unconsumed refreservation | |
407 | * being charged to our parent by the amount of | |
408 | * new unique data we have gained. | |
409 | */ | |
410 | if (old_unique < ds_next->ds_reserved) { | |
411 | int64_t mrsdelta; | |
412 | uint64_t new_unique = | |
d683ddbb | 413 | dsl_dataset_phys(ds_next)->ds_unique_bytes; |
13fe0198 MA |
414 | |
415 | ASSERT(old_unique <= new_unique); | |
416 | mrsdelta = MIN(new_unique - old_unique, | |
417 | ds_next->ds_reserved - old_unique); | |
418 | dsl_dir_diduse_space(ds->ds_dir, | |
419 | DD_USED_REFRSRV, -mrsdelta, 0, 0, tx); | |
420 | } | |
421 | } | |
422 | dsl_dataset_rele(ds_next, FTAG); | |
423 | ||
424 | /* | |
425 | * This must be done after the dsl_traverse(), because it will | |
426 | * re-open the objset. | |
427 | */ | |
428 | if (ds->ds_objset) { | |
429 | dmu_objset_evict(ds->ds_objset); | |
430 | ds->ds_objset = NULL; | |
431 | } | |
432 | ||
433 | /* remove from snapshot namespace */ | |
d683ddbb | 434 | ASSERT(dsl_dataset_phys(ds)->ds_snapnames_zapobj == 0); |
13fe0198 | 435 | VERIFY0(dsl_dataset_hold_obj(dp, |
d683ddbb | 436 | dsl_dir_phys(ds->ds_dir)->dd_head_dataset_obj, FTAG, &ds_head)); |
13fe0198 MA |
437 | VERIFY0(dsl_dataset_get_snapname(ds)); |
438 | #ifdef ZFS_DEBUG | |
439 | { | |
440 | uint64_t val; | |
441 | ||
442 | err = dsl_dataset_snap_lookup(ds_head, | |
443 | ds->ds_snapname, &val); | |
444 | ASSERT0(err); | |
445 | ASSERT3U(val, ==, obj); | |
446 | } | |
447 | #endif | |
788eb90c | 448 | VERIFY0(dsl_dataset_snap_remove(ds_head, ds->ds_snapname, tx, B_TRUE)); |
13fe0198 MA |
449 | dsl_dataset_rele(ds_head, FTAG); |
450 | ||
451 | if (ds_prev != NULL) | |
452 | dsl_dataset_rele(ds_prev, FTAG); | |
453 | ||
454 | spa_prop_clear_bootfs(dp->dp_spa, ds->ds_object, tx); | |
455 | ||
d683ddbb | 456 | if (dsl_dataset_phys(ds)->ds_next_clones_obj != 0) { |
13fe0198 MA |
457 | ASSERTV(uint64_t count); |
458 | ASSERT0(zap_count(mos, | |
d683ddbb JG |
459 | dsl_dataset_phys(ds)->ds_next_clones_obj, &count) && |
460 | count == 0); | |
13fe0198 | 461 | VERIFY0(dmu_object_free(mos, |
d683ddbb | 462 | dsl_dataset_phys(ds)->ds_next_clones_obj, tx)); |
13fe0198 | 463 | } |
d683ddbb JG |
464 | if (dsl_dataset_phys(ds)->ds_props_obj != 0) |
465 | VERIFY0(zap_destroy(mos, dsl_dataset_phys(ds)->ds_props_obj, | |
466 | tx)); | |
467 | if (dsl_dataset_phys(ds)->ds_userrefs_obj != 0) | |
468 | VERIFY0(zap_destroy(mos, dsl_dataset_phys(ds)->ds_userrefs_obj, | |
469 | tx)); | |
13fe0198 MA |
470 | dsl_dir_rele(ds->ds_dir, ds); |
471 | ds->ds_dir = NULL; | |
fa86b5db | 472 | dmu_object_free_zapified(mos, obj, tx); |
13fe0198 MA |
473 | } |
474 | ||
475 | static void | |
476 | dsl_destroy_snapshot_sync(void *arg, dmu_tx_t *tx) | |
477 | { | |
478 | dmu_snapshots_destroy_arg_t *dsda = arg; | |
479 | dsl_pool_t *dp = dmu_tx_pool(tx); | |
480 | nvpair_t *pair; | |
481 | ||
482 | for (pair = nvlist_next_nvpair(dsda->dsda_successful_snaps, NULL); | |
483 | pair != NULL; | |
484 | pair = nvlist_next_nvpair(dsda->dsda_successful_snaps, pair)) { | |
485 | dsl_dataset_t *ds; | |
486 | ||
487 | VERIFY0(dsl_dataset_hold(dp, nvpair_name(pair), FTAG, &ds)); | |
488 | ||
489 | dsl_destroy_snapshot_sync_impl(ds, dsda->dsda_defer, tx); | |
490 | dsl_dataset_rele(ds, FTAG); | |
491 | } | |
492 | } | |
493 | ||
494 | /* | |
495 | * The semantics of this function are described in the comment above | |
496 | * lzc_destroy_snaps(). To summarize: | |
497 | * | |
498 | * The snapshots must all be in the same pool. | |
499 | * | |
500 | * Snapshots that don't exist will be silently ignored (considered to be | |
501 | * "already deleted"). | |
502 | * | |
503 | * On success, all snaps will be destroyed and this will return 0. | |
504 | * On failure, no snaps will be destroyed, the errlist will be filled in, | |
505 | * and this will return an errno. | |
506 | */ | |
507 | int | |
508 | dsl_destroy_snapshots_nvl(nvlist_t *snaps, boolean_t defer, | |
509 | nvlist_t *errlist) | |
510 | { | |
511 | dmu_snapshots_destroy_arg_t dsda; | |
512 | int error; | |
513 | nvpair_t *pair; | |
514 | ||
515 | pair = nvlist_next_nvpair(snaps, NULL); | |
516 | if (pair == NULL) | |
517 | return (0); | |
518 | ||
519 | dsda.dsda_snaps = snaps; | |
d1d7e268 | 520 | VERIFY0(nvlist_alloc(&dsda.dsda_successful_snaps, |
79c76d5b | 521 | NV_UNIQUE_NAME, KM_SLEEP)); |
13fe0198 MA |
522 | dsda.dsda_defer = defer; |
523 | dsda.dsda_errlist = errlist; | |
524 | ||
525 | error = dsl_sync_task(nvpair_name(pair), | |
526 | dsl_destroy_snapshot_check, dsl_destroy_snapshot_sync, | |
3d45fdd6 | 527 | &dsda, 0, ZFS_SPACE_CHECK_NONE); |
13fe0198 MA |
528 | fnvlist_free(dsda.dsda_successful_snaps); |
529 | ||
530 | return (error); | |
531 | } | |
532 | ||
533 | int | |
534 | dsl_destroy_snapshot(const char *name, boolean_t defer) | |
535 | { | |
536 | int error; | |
79c76d5b BB |
537 | nvlist_t *nvl = fnvlist_alloc(); |
538 | nvlist_t *errlist = fnvlist_alloc(); | |
13fe0198 MA |
539 | |
540 | fnvlist_add_boolean(nvl, name); | |
541 | error = dsl_destroy_snapshots_nvl(nvl, defer, errlist); | |
542 | fnvlist_free(errlist); | |
543 | fnvlist_free(nvl); | |
544 | return (error); | |
545 | } | |
546 | ||
547 | struct killarg { | |
548 | dsl_dataset_t *ds; | |
549 | dmu_tx_t *tx; | |
550 | }; | |
551 | ||
552 | /* ARGSUSED */ | |
553 | static int | |
554 | kill_blkptr(spa_t *spa, zilog_t *zilog, const blkptr_t *bp, | |
5dbd68a3 | 555 | const zbookmark_phys_t *zb, const dnode_phys_t *dnp, void *arg) |
13fe0198 MA |
556 | { |
557 | struct killarg *ka = arg; | |
558 | dmu_tx_t *tx = ka->tx; | |
559 | ||
9b67f605 | 560 | if (BP_IS_HOLE(bp) || BP_IS_EMBEDDED(bp)) |
13fe0198 MA |
561 | return (0); |
562 | ||
563 | if (zb->zb_level == ZB_ZIL_LEVEL) { | |
564 | ASSERT(zilog != NULL); | |
565 | /* | |
566 | * It's a block in the intent log. It has no | |
567 | * accounting, so just free it. | |
568 | */ | |
569 | dsl_free(ka->tx->tx_pool, ka->tx->tx_txg, bp); | |
570 | } else { | |
571 | ASSERT(zilog == NULL); | |
d683ddbb JG |
572 | ASSERT3U(bp->blk_birth, >, |
573 | dsl_dataset_phys(ka->ds)->ds_prev_snap_txg); | |
13fe0198 MA |
574 | (void) dsl_dataset_block_kill(ka->ds, bp, tx, B_FALSE); |
575 | } | |
576 | ||
577 | return (0); | |
578 | } | |
579 | ||
580 | static void | |
581 | old_synchronous_dataset_destroy(dsl_dataset_t *ds, dmu_tx_t *tx) | |
582 | { | |
583 | struct killarg ka; | |
584 | ||
585 | /* | |
586 | * Free everything that we point to (that's born after | |
587 | * the previous snapshot, if we are a clone) | |
588 | * | |
589 | * NB: this should be very quick, because we already | |
590 | * freed all the objects in open context. | |
591 | */ | |
592 | ka.ds = ds; | |
593 | ka.tx = tx; | |
594 | VERIFY0(traverse_dataset(ds, | |
d683ddbb | 595 | dsl_dataset_phys(ds)->ds_prev_snap_txg, TRAVERSE_POST, |
13fe0198 | 596 | kill_blkptr, &ka)); |
d683ddbb JG |
597 | ASSERT(!DS_UNIQUE_IS_ACCURATE(ds) || |
598 | dsl_dataset_phys(ds)->ds_unique_bytes == 0); | |
13fe0198 MA |
599 | } |
600 | ||
601 | typedef struct dsl_destroy_head_arg { | |
602 | const char *ddha_name; | |
603 | } dsl_destroy_head_arg_t; | |
604 | ||
605 | int | |
606 | dsl_destroy_head_check_impl(dsl_dataset_t *ds, int expected_holds) | |
607 | { | |
608 | int error; | |
609 | uint64_t count; | |
610 | objset_t *mos; | |
611 | ||
0c66c32d JG |
612 | ASSERT(!ds->ds_is_snapshot); |
613 | if (ds->ds_is_snapshot) | |
2e528b49 | 614 | return (SET_ERROR(EINVAL)); |
13fe0198 MA |
615 | |
616 | if (refcount_count(&ds->ds_longholds) != expected_holds) | |
2e528b49 | 617 | return (SET_ERROR(EBUSY)); |
13fe0198 MA |
618 | |
619 | mos = ds->ds_dir->dd_pool->dp_meta_objset; | |
620 | ||
621 | /* | |
622 | * Can't delete a head dataset if there are snapshots of it. | |
623 | * (Except if the only snapshots are from the branch we cloned | |
624 | * from.) | |
625 | */ | |
626 | if (ds->ds_prev != NULL && | |
d683ddbb | 627 | dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj == ds->ds_object) |
2e528b49 | 628 | return (SET_ERROR(EBUSY)); |
13fe0198 MA |
629 | |
630 | /* | |
631 | * Can't delete if there are children of this fs. | |
632 | */ | |
633 | error = zap_count(mos, | |
d683ddbb | 634 | dsl_dir_phys(ds->ds_dir)->dd_child_dir_zapobj, &count); |
13fe0198 MA |
635 | if (error != 0) |
636 | return (error); | |
637 | if (count != 0) | |
2e528b49 | 638 | return (SET_ERROR(EEXIST)); |
13fe0198 MA |
639 | |
640 | if (dsl_dir_is_clone(ds->ds_dir) && DS_IS_DEFER_DESTROY(ds->ds_prev) && | |
d683ddbb | 641 | dsl_dataset_phys(ds->ds_prev)->ds_num_children == 2 && |
13fe0198 MA |
642 | ds->ds_prev->ds_userrefs == 0) { |
643 | /* We need to remove the origin snapshot as well. */ | |
644 | if (!refcount_is_zero(&ds->ds_prev->ds_longholds)) | |
2e528b49 | 645 | return (SET_ERROR(EBUSY)); |
13fe0198 MA |
646 | } |
647 | return (0); | |
648 | } | |
649 | ||
650 | static int | |
651 | dsl_destroy_head_check(void *arg, dmu_tx_t *tx) | |
652 | { | |
653 | dsl_destroy_head_arg_t *ddha = arg; | |
654 | dsl_pool_t *dp = dmu_tx_pool(tx); | |
655 | dsl_dataset_t *ds; | |
656 | int error; | |
657 | ||
658 | error = dsl_dataset_hold(dp, ddha->ddha_name, FTAG, &ds); | |
659 | if (error != 0) | |
660 | return (error); | |
661 | ||
662 | error = dsl_destroy_head_check_impl(ds, 0); | |
663 | dsl_dataset_rele(ds, FTAG); | |
664 | return (error); | |
665 | } | |
666 | ||
667 | static void | |
668 | dsl_dir_destroy_sync(uint64_t ddobj, dmu_tx_t *tx) | |
669 | { | |
670 | dsl_dir_t *dd; | |
671 | dsl_pool_t *dp = dmu_tx_pool(tx); | |
672 | objset_t *mos = dp->dp_meta_objset; | |
673 | dd_used_t t; | |
674 | ||
675 | ASSERT(RRW_WRITE_HELD(&dmu_tx_pool(tx)->dp_config_rwlock)); | |
676 | ||
677 | VERIFY0(dsl_dir_hold_obj(dp, ddobj, NULL, FTAG, &dd)); | |
678 | ||
d683ddbb | 679 | ASSERT0(dsl_dir_phys(dd)->dd_head_dataset_obj); |
13fe0198 | 680 | |
788eb90c JJ |
681 | /* |
682 | * Decrement the filesystem count for all parent filesystems. | |
683 | * | |
684 | * When we receive an incremental stream into a filesystem that already | |
685 | * exists, a temporary clone is created. We never count this temporary | |
686 | * clone, whose name begins with a '%'. | |
687 | */ | |
688 | if (dd->dd_myname[0] != '%' && dd->dd_parent != NULL) | |
689 | dsl_fs_ss_count_adjust(dd->dd_parent, -1, | |
690 | DD_FIELD_FILESYSTEM_COUNT, tx); | |
691 | ||
13fe0198 MA |
692 | /* |
693 | * Remove our reservation. The impl() routine avoids setting the | |
694 | * actual property, which would require the (already destroyed) ds. | |
695 | */ | |
696 | dsl_dir_set_reservation_sync_impl(dd, 0, tx); | |
697 | ||
d683ddbb JG |
698 | ASSERT0(dsl_dir_phys(dd)->dd_used_bytes); |
699 | ASSERT0(dsl_dir_phys(dd)->dd_reserved); | |
13fe0198 | 700 | for (t = 0; t < DD_USED_NUM; t++) |
d683ddbb | 701 | ASSERT0(dsl_dir_phys(dd)->dd_used_breakdown[t]); |
13fe0198 | 702 | |
d683ddbb JG |
703 | VERIFY0(zap_destroy(mos, dsl_dir_phys(dd)->dd_child_dir_zapobj, tx)); |
704 | VERIFY0(zap_destroy(mos, dsl_dir_phys(dd)->dd_props_zapobj, tx)); | |
705 | VERIFY0(dsl_deleg_destroy(mos, dsl_dir_phys(dd)->dd_deleg_zapobj, tx)); | |
13fe0198 | 706 | VERIFY0(zap_remove(mos, |
d683ddbb JG |
707 | dsl_dir_phys(dd->dd_parent)->dd_child_dir_zapobj, |
708 | dd->dd_myname, tx)); | |
13fe0198 MA |
709 | |
710 | dsl_dir_rele(dd, FTAG); | |
fa86b5db | 711 | dmu_object_free_zapified(mos, ddobj, tx); |
13fe0198 MA |
712 | } |
713 | ||
714 | void | |
715 | dsl_destroy_head_sync_impl(dsl_dataset_t *ds, dmu_tx_t *tx) | |
716 | { | |
717 | dsl_pool_t *dp = dmu_tx_pool(tx); | |
718 | objset_t *mos = dp->dp_meta_objset; | |
719 | uint64_t obj, ddobj, prevobj = 0; | |
720 | boolean_t rmorigin; | |
13fe0198 MA |
721 | objset_t *os; |
722 | ||
d683ddbb | 723 | ASSERT3U(dsl_dataset_phys(ds)->ds_num_children, <=, 1); |
13fe0198 | 724 | ASSERT(ds->ds_prev == NULL || |
d683ddbb JG |
725 | dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj != ds->ds_object); |
726 | ASSERT3U(dsl_dataset_phys(ds)->ds_bp.blk_birth, <=, tx->tx_txg); | |
13fe0198 MA |
727 | ASSERT(RRW_WRITE_HELD(&dp->dp_config_rwlock)); |
728 | ||
729 | /* We need to log before removing it from the namespace. */ | |
730 | spa_history_log_internal_ds(ds, "destroy", tx, ""); | |
731 | ||
732 | rmorigin = (dsl_dir_is_clone(ds->ds_dir) && | |
733 | DS_IS_DEFER_DESTROY(ds->ds_prev) && | |
d683ddbb | 734 | dsl_dataset_phys(ds->ds_prev)->ds_num_children == 2 && |
13fe0198 MA |
735 | ds->ds_prev->ds_userrefs == 0); |
736 | ||
9b67f605 | 737 | /* Remove our reservation. */ |
13fe0198 MA |
738 | if (ds->ds_reserved != 0) { |
739 | dsl_dataset_set_refreservation_sync_impl(ds, | |
740 | (ZPROP_SRC_NONE | ZPROP_SRC_LOCAL | ZPROP_SRC_RECEIVED), | |
741 | 0, tx); | |
742 | ASSERT0(ds->ds_reserved); | |
743 | } | |
744 | ||
f1512ee6 MA |
745 | if (ds->ds_large_blocks) |
746 | spa_feature_decr(dp->dp_spa, SPA_FEATURE_LARGE_BLOCKS, tx); | |
747 | ||
13fe0198 MA |
748 | dsl_scan_ds_destroyed(ds, tx); |
749 | ||
750 | obj = ds->ds_object; | |
751 | ||
d683ddbb | 752 | if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) { |
13fe0198 MA |
753 | /* This is a clone */ |
754 | ASSERT(ds->ds_prev != NULL); | |
d683ddbb JG |
755 | ASSERT3U(dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj, !=, |
756 | obj); | |
757 | ASSERT0(dsl_dataset_phys(ds)->ds_next_snap_obj); | |
13fe0198 MA |
758 | |
759 | dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); | |
d683ddbb | 760 | if (dsl_dataset_phys(ds->ds_prev)->ds_next_clones_obj != 0) { |
13fe0198 MA |
761 | dsl_dataset_remove_from_next_clones(ds->ds_prev, |
762 | obj, tx); | |
763 | } | |
764 | ||
d683ddbb JG |
765 | ASSERT3U(dsl_dataset_phys(ds->ds_prev)->ds_num_children, >, 1); |
766 | dsl_dataset_phys(ds->ds_prev)->ds_num_children--; | |
13fe0198 MA |
767 | } |
768 | ||
13fe0198 MA |
769 | /* |
770 | * Destroy the deadlist. Unless it's a clone, the | |
771 | * deadlist should be empty. (If it's a clone, it's | |
772 | * safe to ignore the deadlist contents.) | |
773 | */ | |
774 | dsl_deadlist_close(&ds->ds_deadlist); | |
d683ddbb | 775 | dsl_deadlist_free(mos, dsl_dataset_phys(ds)->ds_deadlist_obj, tx); |
13fe0198 | 776 | dmu_buf_will_dirty(ds->ds_dbuf, tx); |
d683ddbb | 777 | dsl_dataset_phys(ds)->ds_deadlist_obj = 0; |
13fe0198 MA |
778 | |
779 | VERIFY0(dmu_objset_from_ds(ds, &os)); | |
780 | ||
fa86b5db | 781 | if (!spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_ASYNC_DESTROY)) { |
13fe0198 MA |
782 | old_synchronous_dataset_destroy(ds, tx); |
783 | } else { | |
784 | /* | |
785 | * Move the bptree into the pool's list of trees to | |
786 | * clean up and update space accounting information. | |
787 | */ | |
788 | uint64_t used, comp, uncomp; | |
789 | ||
790 | zil_destroy_sync(dmu_objset_zil(os), tx); | |
791 | ||
fa86b5db MA |
792 | if (!spa_feature_is_active(dp->dp_spa, |
793 | SPA_FEATURE_ASYNC_DESTROY)) { | |
2696dfaf | 794 | dsl_scan_t *scn = dp->dp_scan; |
fa86b5db MA |
795 | spa_feature_incr(dp->dp_spa, SPA_FEATURE_ASYNC_DESTROY, |
796 | tx); | |
13fe0198 MA |
797 | dp->dp_bptree_obj = bptree_alloc(mos, tx); |
798 | VERIFY0(zap_add(mos, | |
799 | DMU_POOL_DIRECTORY_OBJECT, | |
800 | DMU_POOL_BPTREE_OBJ, sizeof (uint64_t), 1, | |
801 | &dp->dp_bptree_obj, tx)); | |
2696dfaf GW |
802 | ASSERT(!scn->scn_async_destroying); |
803 | scn->scn_async_destroying = B_TRUE; | |
13fe0198 MA |
804 | } |
805 | ||
d683ddbb JG |
806 | used = dsl_dir_phys(ds->ds_dir)->dd_used_bytes; |
807 | comp = dsl_dir_phys(ds->ds_dir)->dd_compressed_bytes; | |
808 | uncomp = dsl_dir_phys(ds->ds_dir)->dd_uncompressed_bytes; | |
13fe0198 MA |
809 | |
810 | ASSERT(!DS_UNIQUE_IS_ACCURATE(ds) || | |
d683ddbb | 811 | dsl_dataset_phys(ds)->ds_unique_bytes == used); |
13fe0198 MA |
812 | |
813 | bptree_add(mos, dp->dp_bptree_obj, | |
d683ddbb JG |
814 | &dsl_dataset_phys(ds)->ds_bp, |
815 | dsl_dataset_phys(ds)->ds_prev_snap_txg, | |
13fe0198 MA |
816 | used, comp, uncomp, tx); |
817 | dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD, | |
818 | -used, -comp, -uncomp, tx); | |
819 | dsl_dir_diduse_space(dp->dp_free_dir, DD_USED_HEAD, | |
820 | used, comp, uncomp, tx); | |
821 | } | |
822 | ||
823 | if (ds->ds_prev != NULL) { | |
824 | if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { | |
825 | VERIFY0(zap_remove_int(mos, | |
d683ddbb | 826 | dsl_dir_phys(ds->ds_prev->ds_dir)->dd_clones, |
13fe0198 MA |
827 | ds->ds_object, tx)); |
828 | } | |
829 | prevobj = ds->ds_prev->ds_object; | |
830 | dsl_dataset_rele(ds->ds_prev, ds); | |
831 | ds->ds_prev = NULL; | |
832 | } | |
833 | ||
834 | /* | |
835 | * This must be done after the dsl_traverse(), because it will | |
836 | * re-open the objset. | |
837 | */ | |
838 | if (ds->ds_objset) { | |
839 | dmu_objset_evict(ds->ds_objset); | |
840 | ds->ds_objset = NULL; | |
841 | } | |
842 | ||
843 | /* Erase the link in the dir */ | |
844 | dmu_buf_will_dirty(ds->ds_dir->dd_dbuf, tx); | |
d683ddbb | 845 | dsl_dir_phys(ds->ds_dir)->dd_head_dataset_obj = 0; |
13fe0198 | 846 | ddobj = ds->ds_dir->dd_object; |
d683ddbb JG |
847 | ASSERT(dsl_dataset_phys(ds)->ds_snapnames_zapobj != 0); |
848 | VERIFY0(zap_destroy(mos, | |
849 | dsl_dataset_phys(ds)->ds_snapnames_zapobj, tx)); | |
13fe0198 | 850 | |
da536844 | 851 | if (ds->ds_bookmarks != 0) { |
d683ddbb | 852 | VERIFY0(zap_destroy(mos, ds->ds_bookmarks, tx)); |
da536844 MA |
853 | spa_feature_decr(dp->dp_spa, SPA_FEATURE_BOOKMARKS, tx); |
854 | } | |
855 | ||
13fe0198 MA |
856 | spa_prop_clear_bootfs(dp->dp_spa, ds->ds_object, tx); |
857 | ||
d683ddbb JG |
858 | ASSERT0(dsl_dataset_phys(ds)->ds_next_clones_obj); |
859 | ASSERT0(dsl_dataset_phys(ds)->ds_props_obj); | |
860 | ASSERT0(dsl_dataset_phys(ds)->ds_userrefs_obj); | |
13fe0198 MA |
861 | dsl_dir_rele(ds->ds_dir, ds); |
862 | ds->ds_dir = NULL; | |
fa86b5db | 863 | dmu_object_free_zapified(mos, obj, tx); |
13fe0198 MA |
864 | |
865 | dsl_dir_destroy_sync(ddobj, tx); | |
866 | ||
867 | if (rmorigin) { | |
868 | dsl_dataset_t *prev; | |
869 | VERIFY0(dsl_dataset_hold_obj(dp, prevobj, FTAG, &prev)); | |
870 | dsl_destroy_snapshot_sync_impl(prev, B_FALSE, tx); | |
871 | dsl_dataset_rele(prev, FTAG); | |
872 | } | |
873 | } | |
874 | ||
875 | static void | |
876 | dsl_destroy_head_sync(void *arg, dmu_tx_t *tx) | |
877 | { | |
878 | dsl_destroy_head_arg_t *ddha = arg; | |
879 | dsl_pool_t *dp = dmu_tx_pool(tx); | |
880 | dsl_dataset_t *ds; | |
881 | ||
882 | VERIFY0(dsl_dataset_hold(dp, ddha->ddha_name, FTAG, &ds)); | |
883 | dsl_destroy_head_sync_impl(ds, tx); | |
884 | dsl_dataset_rele(ds, FTAG); | |
885 | } | |
886 | ||
887 | static void | |
888 | dsl_destroy_head_begin_sync(void *arg, dmu_tx_t *tx) | |
889 | { | |
890 | dsl_destroy_head_arg_t *ddha = arg; | |
891 | dsl_pool_t *dp = dmu_tx_pool(tx); | |
892 | dsl_dataset_t *ds; | |
893 | ||
894 | VERIFY0(dsl_dataset_hold(dp, ddha->ddha_name, FTAG, &ds)); | |
895 | ||
896 | /* Mark it as inconsistent on-disk, in case we crash */ | |
897 | dmu_buf_will_dirty(ds->ds_dbuf, tx); | |
d683ddbb | 898 | dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_INCONSISTENT; |
13fe0198 MA |
899 | |
900 | spa_history_log_internal_ds(ds, "destroy begin", tx, ""); | |
901 | dsl_dataset_rele(ds, FTAG); | |
902 | } | |
903 | ||
904 | int | |
905 | dsl_destroy_head(const char *name) | |
906 | { | |
907 | dsl_destroy_head_arg_t ddha; | |
908 | int error; | |
909 | spa_t *spa; | |
910 | boolean_t isenabled; | |
911 | ||
912 | #ifdef _KERNEL | |
913 | zfs_destroy_unmount_origin(name); | |
914 | #endif | |
915 | ||
916 | error = spa_open(name, &spa, FTAG); | |
917 | if (error != 0) | |
918 | return (error); | |
fa86b5db | 919 | isenabled = spa_feature_is_enabled(spa, SPA_FEATURE_ASYNC_DESTROY); |
13fe0198 MA |
920 | spa_close(spa, FTAG); |
921 | ||
922 | ddha.ddha_name = name; | |
923 | ||
924 | if (!isenabled) { | |
925 | objset_t *os; | |
926 | ||
927 | error = dsl_sync_task(name, dsl_destroy_head_check, | |
3d45fdd6 MA |
928 | dsl_destroy_head_begin_sync, &ddha, |
929 | 0, ZFS_SPACE_CHECK_NONE); | |
13fe0198 MA |
930 | if (error != 0) |
931 | return (error); | |
932 | ||
933 | /* | |
934 | * Head deletion is processed in one txg on old pools; | |
935 | * remove the objects from open context so that the txg sync | |
936 | * is not too long. | |
937 | */ | |
938 | error = dmu_objset_own(name, DMU_OST_ANY, B_FALSE, FTAG, &os); | |
939 | if (error == 0) { | |
940 | uint64_t obj; | |
941 | uint64_t prev_snap_txg = | |
d683ddbb JG |
942 | dsl_dataset_phys(dmu_objset_ds(os))-> |
943 | ds_prev_snap_txg; | |
13fe0198 MA |
944 | for (obj = 0; error == 0; |
945 | error = dmu_object_next(os, &obj, FALSE, | |
946 | prev_snap_txg)) | |
b663a23d | 947 | (void) dmu_free_long_object(os, obj); |
13fe0198 MA |
948 | /* sync out all frees */ |
949 | txg_wait_synced(dmu_objset_pool(os), 0); | |
950 | dmu_objset_disown(os, FTAG); | |
951 | } | |
952 | } | |
953 | ||
954 | return (dsl_sync_task(name, dsl_destroy_head_check, | |
3d45fdd6 | 955 | dsl_destroy_head_sync, &ddha, 0, ZFS_SPACE_CHECK_NONE)); |
13fe0198 MA |
956 | } |
957 | ||
958 | /* | |
959 | * Note, this function is used as the callback for dmu_objset_find(). We | |
960 | * always return 0 so that we will continue to find and process | |
961 | * inconsistent datasets, even if we encounter an error trying to | |
962 | * process one of them. | |
963 | */ | |
964 | /* ARGSUSED */ | |
965 | int | |
966 | dsl_destroy_inconsistent(const char *dsname, void *arg) | |
967 | { | |
968 | objset_t *os; | |
969 | ||
970 | if (dmu_objset_hold(dsname, FTAG, &os) == 0) { | |
971 | boolean_t inconsistent = DS_IS_INCONSISTENT(dmu_objset_ds(os)); | |
972 | dmu_objset_rele(os, FTAG); | |
973 | if (inconsistent) | |
974 | (void) dsl_destroy_head(dsname); | |
975 | } | |
976 | return (0); | |
977 | } | |
978 | ||
979 | ||
980 | #if defined(_KERNEL) && defined(HAVE_SPL) | |
981 | EXPORT_SYMBOL(dsl_destroy_head); | |
982 | EXPORT_SYMBOL(dsl_destroy_head_sync_impl); | |
983 | EXPORT_SYMBOL(dsl_dataset_user_hold_check_one); | |
984 | EXPORT_SYMBOL(dsl_destroy_snapshot_sync_impl); | |
985 | EXPORT_SYMBOL(dsl_destroy_inconsistent); | |
986 | EXPORT_SYMBOL(dsl_dataset_user_release_tmp); | |
987 | EXPORT_SYMBOL(dsl_destroy_head_check_impl); | |
988 | #endif |