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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 | /* | |
d164b209 | 22 | * Copyright 2009 Sun Microsystems, Inc. All rights reserved. |
34dc7c2f BB |
23 | * Use is subject to license terms. |
24 | */ | |
25 | ||
34dc7c2f BB |
26 | #include <sys/dmu_objset.h> |
27 | #include <sys/dsl_dataset.h> | |
28 | #include <sys/dsl_dir.h> | |
29 | #include <sys/dsl_prop.h> | |
30 | #include <sys/dsl_synctask.h> | |
31 | #include <sys/dmu_traverse.h> | |
32 | #include <sys/dmu_tx.h> | |
33 | #include <sys/arc.h> | |
34 | #include <sys/zio.h> | |
35 | #include <sys/zap.h> | |
36 | #include <sys/unique.h> | |
37 | #include <sys/zfs_context.h> | |
38 | #include <sys/zfs_ioctl.h> | |
39 | #include <sys/spa.h> | |
b128c09f | 40 | #include <sys/zfs_znode.h> |
34dc7c2f | 41 | #include <sys/sunddi.h> |
45d1cae3 | 42 | #include <sys/zvol.h> |
34dc7c2f | 43 | |
b128c09f BB |
44 | static char *dsl_reaper = "the grim reaper"; |
45 | ||
34dc7c2f BB |
46 | static dsl_checkfunc_t dsl_dataset_destroy_begin_check; |
47 | static dsl_syncfunc_t dsl_dataset_destroy_begin_sync; | |
48 | static dsl_checkfunc_t dsl_dataset_rollback_check; | |
49 | static dsl_syncfunc_t dsl_dataset_rollback_sync; | |
50 | static dsl_syncfunc_t dsl_dataset_set_reservation_sync; | |
51 | ||
52 | #define DS_REF_MAX (1ULL << 62) | |
53 | ||
54 | #define DSL_DEADLIST_BLOCKSIZE SPA_MAXBLOCKSIZE | |
55 | ||
b128c09f BB |
56 | #define DSL_DATASET_IS_DESTROYED(ds) ((ds)->ds_owner == dsl_reaper) |
57 | ||
34dc7c2f BB |
58 | |
59 | /* | |
60 | * Figure out how much of this delta should be propogated to the dsl_dir | |
61 | * layer. If there's a refreservation, that space has already been | |
62 | * partially accounted for in our ancestors. | |
63 | */ | |
64 | static int64_t | |
65 | parent_delta(dsl_dataset_t *ds, int64_t delta) | |
66 | { | |
67 | uint64_t old_bytes, new_bytes; | |
68 | ||
69 | if (ds->ds_reserved == 0) | |
70 | return (delta); | |
71 | ||
72 | old_bytes = MAX(ds->ds_phys->ds_unique_bytes, ds->ds_reserved); | |
73 | new_bytes = MAX(ds->ds_phys->ds_unique_bytes + delta, ds->ds_reserved); | |
74 | ||
75 | ASSERT3U(ABS((int64_t)(new_bytes - old_bytes)), <=, ABS(delta)); | |
76 | return (new_bytes - old_bytes); | |
77 | } | |
78 | ||
79 | void | |
80 | dsl_dataset_block_born(dsl_dataset_t *ds, blkptr_t *bp, dmu_tx_t *tx) | |
81 | { | |
82 | int used = bp_get_dasize(tx->tx_pool->dp_spa, bp); | |
83 | int compressed = BP_GET_PSIZE(bp); | |
84 | int uncompressed = BP_GET_UCSIZE(bp); | |
85 | int64_t delta; | |
86 | ||
87 | dprintf_bp(bp, "born, ds=%p\n", ds); | |
88 | ||
89 | ASSERT(dmu_tx_is_syncing(tx)); | |
90 | /* It could have been compressed away to nothing */ | |
91 | if (BP_IS_HOLE(bp)) | |
92 | return; | |
93 | ASSERT(BP_GET_TYPE(bp) != DMU_OT_NONE); | |
94 | ASSERT3U(BP_GET_TYPE(bp), <, DMU_OT_NUMTYPES); | |
95 | if (ds == NULL) { | |
96 | /* | |
97 | * Account for the meta-objset space in its placeholder | |
98 | * dsl_dir. | |
99 | */ | |
100 | ASSERT3U(compressed, ==, uncompressed); /* it's all metadata */ | |
b128c09f | 101 | dsl_dir_diduse_space(tx->tx_pool->dp_mos_dir, DD_USED_HEAD, |
34dc7c2f BB |
102 | used, compressed, uncompressed, tx); |
103 | dsl_dir_dirty(tx->tx_pool->dp_mos_dir, tx); | |
104 | return; | |
105 | } | |
106 | dmu_buf_will_dirty(ds->ds_dbuf, tx); | |
b128c09f | 107 | mutex_enter(&ds->ds_dir->dd_lock); |
34dc7c2f BB |
108 | mutex_enter(&ds->ds_lock); |
109 | delta = parent_delta(ds, used); | |
110 | ds->ds_phys->ds_used_bytes += used; | |
111 | ds->ds_phys->ds_compressed_bytes += compressed; | |
112 | ds->ds_phys->ds_uncompressed_bytes += uncompressed; | |
113 | ds->ds_phys->ds_unique_bytes += used; | |
114 | mutex_exit(&ds->ds_lock); | |
b128c09f BB |
115 | dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD, delta, |
116 | compressed, uncompressed, tx); | |
117 | dsl_dir_transfer_space(ds->ds_dir, used - delta, | |
118 | DD_USED_REFRSRV, DD_USED_HEAD, tx); | |
119 | mutex_exit(&ds->ds_dir->dd_lock); | |
34dc7c2f BB |
120 | } |
121 | ||
b128c09f | 122 | int |
34dc7c2f BB |
123 | dsl_dataset_block_kill(dsl_dataset_t *ds, blkptr_t *bp, zio_t *pio, |
124 | dmu_tx_t *tx) | |
125 | { | |
126 | int used = bp_get_dasize(tx->tx_pool->dp_spa, bp); | |
127 | int compressed = BP_GET_PSIZE(bp); | |
128 | int uncompressed = BP_GET_UCSIZE(bp); | |
129 | ||
b128c09f | 130 | ASSERT(pio != NULL); |
34dc7c2f BB |
131 | ASSERT(dmu_tx_is_syncing(tx)); |
132 | /* No block pointer => nothing to free */ | |
133 | if (BP_IS_HOLE(bp)) | |
b128c09f | 134 | return (0); |
34dc7c2f BB |
135 | |
136 | ASSERT(used > 0); | |
137 | if (ds == NULL) { | |
138 | int err; | |
139 | /* | |
140 | * Account for the meta-objset space in its placeholder | |
141 | * dataset. | |
142 | */ | |
b128c09f BB |
143 | err = dsl_free(pio, tx->tx_pool, |
144 | tx->tx_txg, bp, NULL, NULL, ARC_NOWAIT); | |
34dc7c2f BB |
145 | ASSERT(err == 0); |
146 | ||
b128c09f | 147 | dsl_dir_diduse_space(tx->tx_pool->dp_mos_dir, DD_USED_HEAD, |
34dc7c2f BB |
148 | -used, -compressed, -uncompressed, tx); |
149 | dsl_dir_dirty(tx->tx_pool->dp_mos_dir, tx); | |
b128c09f | 150 | return (used); |
34dc7c2f BB |
151 | } |
152 | ASSERT3P(tx->tx_pool, ==, ds->ds_dir->dd_pool); | |
153 | ||
b128c09f | 154 | ASSERT(!dsl_dataset_is_snapshot(ds)); |
34dc7c2f BB |
155 | dmu_buf_will_dirty(ds->ds_dbuf, tx); |
156 | ||
157 | if (bp->blk_birth > ds->ds_phys->ds_prev_snap_txg) { | |
158 | int err; | |
159 | int64_t delta; | |
160 | ||
161 | dprintf_bp(bp, "freeing: %s", ""); | |
b128c09f BB |
162 | err = dsl_free(pio, tx->tx_pool, |
163 | tx->tx_txg, bp, NULL, NULL, ARC_NOWAIT); | |
34dc7c2f BB |
164 | ASSERT(err == 0); |
165 | ||
b128c09f | 166 | mutex_enter(&ds->ds_dir->dd_lock); |
34dc7c2f BB |
167 | mutex_enter(&ds->ds_lock); |
168 | ASSERT(ds->ds_phys->ds_unique_bytes >= used || | |
169 | !DS_UNIQUE_IS_ACCURATE(ds)); | |
170 | delta = parent_delta(ds, -used); | |
171 | ds->ds_phys->ds_unique_bytes -= used; | |
172 | mutex_exit(&ds->ds_lock); | |
b128c09f | 173 | dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD, |
34dc7c2f | 174 | delta, -compressed, -uncompressed, tx); |
b128c09f BB |
175 | dsl_dir_transfer_space(ds->ds_dir, -used - delta, |
176 | DD_USED_REFRSRV, DD_USED_HEAD, tx); | |
177 | mutex_exit(&ds->ds_dir->dd_lock); | |
34dc7c2f BB |
178 | } else { |
179 | dprintf_bp(bp, "putting on dead list: %s", ""); | |
180 | VERIFY(0 == bplist_enqueue(&ds->ds_deadlist, bp, tx)); | |
181 | ASSERT3U(ds->ds_prev->ds_object, ==, | |
182 | ds->ds_phys->ds_prev_snap_obj); | |
183 | ASSERT(ds->ds_prev->ds_phys->ds_num_children > 0); | |
184 | /* if (bp->blk_birth > prev prev snap txg) prev unique += bs */ | |
185 | if (ds->ds_prev->ds_phys->ds_next_snap_obj == | |
186 | ds->ds_object && bp->blk_birth > | |
187 | ds->ds_prev->ds_phys->ds_prev_snap_txg) { | |
188 | dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); | |
189 | mutex_enter(&ds->ds_prev->ds_lock); | |
190 | ds->ds_prev->ds_phys->ds_unique_bytes += used; | |
191 | mutex_exit(&ds->ds_prev->ds_lock); | |
192 | } | |
b128c09f BB |
193 | if (bp->blk_birth > ds->ds_origin_txg) { |
194 | dsl_dir_transfer_space(ds->ds_dir, used, | |
195 | DD_USED_HEAD, DD_USED_SNAP, tx); | |
196 | } | |
34dc7c2f BB |
197 | } |
198 | mutex_enter(&ds->ds_lock); | |
199 | ASSERT3U(ds->ds_phys->ds_used_bytes, >=, used); | |
200 | ds->ds_phys->ds_used_bytes -= used; | |
201 | ASSERT3U(ds->ds_phys->ds_compressed_bytes, >=, compressed); | |
202 | ds->ds_phys->ds_compressed_bytes -= compressed; | |
203 | ASSERT3U(ds->ds_phys->ds_uncompressed_bytes, >=, uncompressed); | |
204 | ds->ds_phys->ds_uncompressed_bytes -= uncompressed; | |
205 | mutex_exit(&ds->ds_lock); | |
b128c09f BB |
206 | |
207 | return (used); | |
34dc7c2f BB |
208 | } |
209 | ||
210 | uint64_t | |
211 | dsl_dataset_prev_snap_txg(dsl_dataset_t *ds) | |
212 | { | |
213 | uint64_t trysnap = 0; | |
214 | ||
215 | if (ds == NULL) | |
216 | return (0); | |
217 | /* | |
218 | * The snapshot creation could fail, but that would cause an | |
219 | * incorrect FALSE return, which would only result in an | |
220 | * overestimation of the amount of space that an operation would | |
221 | * consume, which is OK. | |
222 | * | |
223 | * There's also a small window where we could miss a pending | |
224 | * snapshot, because we could set the sync task in the quiescing | |
225 | * phase. So this should only be used as a guess. | |
226 | */ | |
227 | if (ds->ds_trysnap_txg > | |
228 | spa_last_synced_txg(ds->ds_dir->dd_pool->dp_spa)) | |
229 | trysnap = ds->ds_trysnap_txg; | |
230 | return (MAX(ds->ds_phys->ds_prev_snap_txg, trysnap)); | |
231 | } | |
232 | ||
9babb374 | 233 | boolean_t |
34dc7c2f BB |
234 | dsl_dataset_block_freeable(dsl_dataset_t *ds, uint64_t blk_birth) |
235 | { | |
236 | return (blk_birth > dsl_dataset_prev_snap_txg(ds)); | |
237 | } | |
238 | ||
239 | /* ARGSUSED */ | |
240 | static void | |
241 | dsl_dataset_evict(dmu_buf_t *db, void *dsv) | |
242 | { | |
243 | dsl_dataset_t *ds = dsv; | |
244 | ||
b128c09f | 245 | ASSERT(ds->ds_owner == NULL || DSL_DATASET_IS_DESTROYED(ds)); |
34dc7c2f BB |
246 | |
247 | dprintf_ds(ds, "evicting %s\n", ""); | |
248 | ||
249 | unique_remove(ds->ds_fsid_guid); | |
250 | ||
251 | if (ds->ds_user_ptr != NULL) | |
252 | ds->ds_user_evict_func(ds, ds->ds_user_ptr); | |
253 | ||
254 | if (ds->ds_prev) { | |
b128c09f | 255 | dsl_dataset_drop_ref(ds->ds_prev, ds); |
34dc7c2f BB |
256 | ds->ds_prev = NULL; |
257 | } | |
258 | ||
259 | bplist_close(&ds->ds_deadlist); | |
b128c09f BB |
260 | if (ds->ds_dir) |
261 | dsl_dir_close(ds->ds_dir, ds); | |
34dc7c2f BB |
262 | |
263 | ASSERT(!list_link_active(&ds->ds_synced_link)); | |
264 | ||
265 | mutex_destroy(&ds->ds_lock); | |
45d1cae3 | 266 | mutex_destroy(&ds->ds_recvlock); |
34dc7c2f BB |
267 | mutex_destroy(&ds->ds_opening_lock); |
268 | mutex_destroy(&ds->ds_deadlist.bpl_lock); | |
b128c09f BB |
269 | rw_destroy(&ds->ds_rwlock); |
270 | cv_destroy(&ds->ds_exclusive_cv); | |
34dc7c2f BB |
271 | |
272 | kmem_free(ds, sizeof (dsl_dataset_t)); | |
273 | } | |
274 | ||
275 | static int | |
276 | dsl_dataset_get_snapname(dsl_dataset_t *ds) | |
277 | { | |
278 | dsl_dataset_phys_t *headphys; | |
279 | int err; | |
280 | dmu_buf_t *headdbuf; | |
281 | dsl_pool_t *dp = ds->ds_dir->dd_pool; | |
282 | objset_t *mos = dp->dp_meta_objset; | |
283 | ||
284 | if (ds->ds_snapname[0]) | |
285 | return (0); | |
286 | if (ds->ds_phys->ds_next_snap_obj == 0) | |
287 | return (0); | |
288 | ||
289 | err = dmu_bonus_hold(mos, ds->ds_dir->dd_phys->dd_head_dataset_obj, | |
290 | FTAG, &headdbuf); | |
291 | if (err) | |
292 | return (err); | |
293 | headphys = headdbuf->db_data; | |
294 | err = zap_value_search(dp->dp_meta_objset, | |
295 | headphys->ds_snapnames_zapobj, ds->ds_object, 0, ds->ds_snapname); | |
296 | dmu_buf_rele(headdbuf, FTAG); | |
297 | return (err); | |
298 | } | |
299 | ||
300 | static int | |
b128c09f | 301 | dsl_dataset_snap_lookup(dsl_dataset_t *ds, const char *name, uint64_t *value) |
34dc7c2f | 302 | { |
b128c09f BB |
303 | objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; |
304 | uint64_t snapobj = ds->ds_phys->ds_snapnames_zapobj; | |
34dc7c2f BB |
305 | matchtype_t mt; |
306 | int err; | |
307 | ||
b128c09f | 308 | if (ds->ds_phys->ds_flags & DS_FLAG_CI_DATASET) |
34dc7c2f BB |
309 | mt = MT_FIRST; |
310 | else | |
311 | mt = MT_EXACT; | |
312 | ||
b128c09f | 313 | err = zap_lookup_norm(mos, snapobj, name, 8, 1, |
34dc7c2f BB |
314 | value, mt, NULL, 0, NULL); |
315 | if (err == ENOTSUP && mt == MT_FIRST) | |
b128c09f | 316 | err = zap_lookup(mos, snapobj, name, 8, 1, value); |
34dc7c2f BB |
317 | return (err); |
318 | } | |
319 | ||
320 | static int | |
b128c09f | 321 | dsl_dataset_snap_remove(dsl_dataset_t *ds, char *name, dmu_tx_t *tx) |
34dc7c2f | 322 | { |
b128c09f BB |
323 | objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; |
324 | uint64_t snapobj = ds->ds_phys->ds_snapnames_zapobj; | |
34dc7c2f BB |
325 | matchtype_t mt; |
326 | int err; | |
327 | ||
b128c09f | 328 | if (ds->ds_phys->ds_flags & DS_FLAG_CI_DATASET) |
34dc7c2f BB |
329 | mt = MT_FIRST; |
330 | else | |
331 | mt = MT_EXACT; | |
332 | ||
b128c09f | 333 | err = zap_remove_norm(mos, snapobj, name, mt, tx); |
34dc7c2f | 334 | if (err == ENOTSUP && mt == MT_FIRST) |
b128c09f | 335 | err = zap_remove(mos, snapobj, name, tx); |
34dc7c2f BB |
336 | return (err); |
337 | } | |
338 | ||
b128c09f BB |
339 | static int |
340 | dsl_dataset_get_ref(dsl_pool_t *dp, uint64_t dsobj, void *tag, | |
341 | dsl_dataset_t **dsp) | |
34dc7c2f | 342 | { |
34dc7c2f BB |
343 | objset_t *mos = dp->dp_meta_objset; |
344 | dmu_buf_t *dbuf; | |
345 | dsl_dataset_t *ds; | |
346 | int err; | |
347 | ||
348 | ASSERT(RW_LOCK_HELD(&dp->dp_config_rwlock) || | |
349 | dsl_pool_sync_context(dp)); | |
350 | ||
351 | err = dmu_bonus_hold(mos, dsobj, tag, &dbuf); | |
352 | if (err) | |
353 | return (err); | |
354 | ds = dmu_buf_get_user(dbuf); | |
355 | if (ds == NULL) { | |
356 | dsl_dataset_t *winner; | |
357 | ||
358 | ds = kmem_zalloc(sizeof (dsl_dataset_t), KM_SLEEP); | |
359 | ds->ds_dbuf = dbuf; | |
360 | ds->ds_object = dsobj; | |
361 | ds->ds_phys = dbuf->db_data; | |
362 | ||
363 | mutex_init(&ds->ds_lock, NULL, MUTEX_DEFAULT, NULL); | |
45d1cae3 | 364 | mutex_init(&ds->ds_recvlock, NULL, MUTEX_DEFAULT, NULL); |
34dc7c2f BB |
365 | mutex_init(&ds->ds_opening_lock, NULL, MUTEX_DEFAULT, NULL); |
366 | mutex_init(&ds->ds_deadlist.bpl_lock, NULL, MUTEX_DEFAULT, | |
367 | NULL); | |
b128c09f BB |
368 | rw_init(&ds->ds_rwlock, 0, 0, 0); |
369 | cv_init(&ds->ds_exclusive_cv, NULL, CV_DEFAULT, NULL); | |
34dc7c2f BB |
370 | |
371 | err = bplist_open(&ds->ds_deadlist, | |
372 | mos, ds->ds_phys->ds_deadlist_obj); | |
373 | if (err == 0) { | |
374 | err = dsl_dir_open_obj(dp, | |
375 | ds->ds_phys->ds_dir_obj, NULL, ds, &ds->ds_dir); | |
376 | } | |
377 | if (err) { | |
378 | /* | |
379 | * we don't really need to close the blist if we | |
380 | * just opened it. | |
381 | */ | |
382 | mutex_destroy(&ds->ds_lock); | |
45d1cae3 | 383 | mutex_destroy(&ds->ds_recvlock); |
34dc7c2f BB |
384 | mutex_destroy(&ds->ds_opening_lock); |
385 | mutex_destroy(&ds->ds_deadlist.bpl_lock); | |
b128c09f BB |
386 | rw_destroy(&ds->ds_rwlock); |
387 | cv_destroy(&ds->ds_exclusive_cv); | |
34dc7c2f BB |
388 | kmem_free(ds, sizeof (dsl_dataset_t)); |
389 | dmu_buf_rele(dbuf, tag); | |
390 | return (err); | |
391 | } | |
392 | ||
b128c09f | 393 | if (!dsl_dataset_is_snapshot(ds)) { |
34dc7c2f BB |
394 | ds->ds_snapname[0] = '\0'; |
395 | if (ds->ds_phys->ds_prev_snap_obj) { | |
b128c09f BB |
396 | err = dsl_dataset_get_ref(dp, |
397 | ds->ds_phys->ds_prev_snap_obj, | |
398 | ds, &ds->ds_prev); | |
34dc7c2f | 399 | } |
b128c09f BB |
400 | |
401 | if (err == 0 && dsl_dir_is_clone(ds->ds_dir)) { | |
402 | dsl_dataset_t *origin; | |
403 | ||
404 | err = dsl_dataset_hold_obj(dp, | |
405 | ds->ds_dir->dd_phys->dd_origin_obj, | |
406 | FTAG, &origin); | |
34dc7c2f | 407 | if (err == 0) { |
b128c09f BB |
408 | ds->ds_origin_txg = |
409 | origin->ds_phys->ds_creation_txg; | |
410 | dsl_dataset_rele(origin, FTAG); | |
34dc7c2f | 411 | } |
34dc7c2f | 412 | } |
45d1cae3 BB |
413 | } else { |
414 | if (zfs_flags & ZFS_DEBUG_SNAPNAMES) | |
415 | err = dsl_dataset_get_snapname(ds); | |
416 | if (err == 0 && ds->ds_phys->ds_userrefs_obj != 0) { | |
417 | err = zap_count( | |
418 | ds->ds_dir->dd_pool->dp_meta_objset, | |
419 | ds->ds_phys->ds_userrefs_obj, | |
420 | &ds->ds_userrefs); | |
421 | } | |
34dc7c2f BB |
422 | } |
423 | ||
b128c09f | 424 | if (err == 0 && !dsl_dataset_is_snapshot(ds)) { |
34dc7c2f BB |
425 | /* |
426 | * In sync context, we're called with either no lock | |
427 | * or with the write lock. If we're not syncing, | |
428 | * we're always called with the read lock held. | |
429 | */ | |
430 | boolean_t need_lock = | |
431 | !RW_WRITE_HELD(&dp->dp_config_rwlock) && | |
432 | dsl_pool_sync_context(dp); | |
433 | ||
434 | if (need_lock) | |
435 | rw_enter(&dp->dp_config_rwlock, RW_READER); | |
436 | ||
b128c09f | 437 | err = dsl_prop_get_ds(ds, |
34dc7c2f BB |
438 | "refreservation", sizeof (uint64_t), 1, |
439 | &ds->ds_reserved, NULL); | |
440 | if (err == 0) { | |
b128c09f | 441 | err = dsl_prop_get_ds(ds, |
34dc7c2f BB |
442 | "refquota", sizeof (uint64_t), 1, |
443 | &ds->ds_quota, NULL); | |
444 | } | |
445 | ||
446 | if (need_lock) | |
447 | rw_exit(&dp->dp_config_rwlock); | |
448 | } else { | |
449 | ds->ds_reserved = ds->ds_quota = 0; | |
450 | } | |
451 | ||
452 | if (err == 0) { | |
453 | winner = dmu_buf_set_user_ie(dbuf, ds, &ds->ds_phys, | |
454 | dsl_dataset_evict); | |
455 | } | |
456 | if (err || winner) { | |
457 | bplist_close(&ds->ds_deadlist); | |
b128c09f BB |
458 | if (ds->ds_prev) |
459 | dsl_dataset_drop_ref(ds->ds_prev, ds); | |
34dc7c2f BB |
460 | dsl_dir_close(ds->ds_dir, ds); |
461 | mutex_destroy(&ds->ds_lock); | |
45d1cae3 | 462 | mutex_destroy(&ds->ds_recvlock); |
34dc7c2f BB |
463 | mutex_destroy(&ds->ds_opening_lock); |
464 | mutex_destroy(&ds->ds_deadlist.bpl_lock); | |
b128c09f BB |
465 | rw_destroy(&ds->ds_rwlock); |
466 | cv_destroy(&ds->ds_exclusive_cv); | |
34dc7c2f BB |
467 | kmem_free(ds, sizeof (dsl_dataset_t)); |
468 | if (err) { | |
469 | dmu_buf_rele(dbuf, tag); | |
470 | return (err); | |
471 | } | |
472 | ds = winner; | |
473 | } else { | |
474 | ds->ds_fsid_guid = | |
475 | unique_insert(ds->ds_phys->ds_fsid_guid); | |
476 | } | |
477 | } | |
478 | ASSERT3P(ds->ds_dbuf, ==, dbuf); | |
479 | ASSERT3P(ds->ds_phys, ==, dbuf->db_data); | |
b128c09f BB |
480 | ASSERT(ds->ds_phys->ds_prev_snap_obj != 0 || |
481 | spa_version(dp->dp_spa) < SPA_VERSION_ORIGIN || | |
482 | dp->dp_origin_snap == NULL || ds == dp->dp_origin_snap); | |
34dc7c2f | 483 | mutex_enter(&ds->ds_lock); |
b128c09f | 484 | if (!dsl_pool_sync_context(dp) && DSL_DATASET_IS_DESTROYED(ds)) { |
34dc7c2f | 485 | mutex_exit(&ds->ds_lock); |
b128c09f BB |
486 | dmu_buf_rele(ds->ds_dbuf, tag); |
487 | return (ENOENT); | |
34dc7c2f | 488 | } |
34dc7c2f | 489 | mutex_exit(&ds->ds_lock); |
34dc7c2f BB |
490 | *dsp = ds; |
491 | return (0); | |
492 | } | |
493 | ||
b128c09f BB |
494 | static int |
495 | dsl_dataset_hold_ref(dsl_dataset_t *ds, void *tag) | |
496 | { | |
497 | dsl_pool_t *dp = ds->ds_dir->dd_pool; | |
498 | ||
499 | /* | |
500 | * In syncing context we don't want the rwlock lock: there | |
501 | * may be an existing writer waiting for sync phase to | |
502 | * finish. We don't need to worry about such writers, since | |
503 | * sync phase is single-threaded, so the writer can't be | |
504 | * doing anything while we are active. | |
505 | */ | |
506 | if (dsl_pool_sync_context(dp)) { | |
507 | ASSERT(!DSL_DATASET_IS_DESTROYED(ds)); | |
508 | return (0); | |
509 | } | |
510 | ||
511 | /* | |
512 | * Normal users will hold the ds_rwlock as a READER until they | |
513 | * are finished (i.e., call dsl_dataset_rele()). "Owners" will | |
514 | * drop their READER lock after they set the ds_owner field. | |
515 | * | |
516 | * If the dataset is being destroyed, the destroy thread will | |
517 | * obtain a WRITER lock for exclusive access after it's done its | |
518 | * open-context work and then change the ds_owner to | |
519 | * dsl_reaper once destruction is assured. So threads | |
520 | * may block here temporarily, until the "destructability" of | |
521 | * the dataset is determined. | |
522 | */ | |
523 | ASSERT(!RW_WRITE_HELD(&dp->dp_config_rwlock)); | |
524 | mutex_enter(&ds->ds_lock); | |
525 | while (!rw_tryenter(&ds->ds_rwlock, RW_READER)) { | |
526 | rw_exit(&dp->dp_config_rwlock); | |
527 | cv_wait(&ds->ds_exclusive_cv, &ds->ds_lock); | |
528 | if (DSL_DATASET_IS_DESTROYED(ds)) { | |
529 | mutex_exit(&ds->ds_lock); | |
530 | dsl_dataset_drop_ref(ds, tag); | |
531 | rw_enter(&dp->dp_config_rwlock, RW_READER); | |
532 | return (ENOENT); | |
533 | } | |
534 | rw_enter(&dp->dp_config_rwlock, RW_READER); | |
535 | } | |
536 | mutex_exit(&ds->ds_lock); | |
537 | return (0); | |
538 | } | |
539 | ||
34dc7c2f | 540 | int |
b128c09f BB |
541 | dsl_dataset_hold_obj(dsl_pool_t *dp, uint64_t dsobj, void *tag, |
542 | dsl_dataset_t **dsp) | |
543 | { | |
544 | int err = dsl_dataset_get_ref(dp, dsobj, tag, dsp); | |
545 | ||
546 | if (err) | |
547 | return (err); | |
548 | return (dsl_dataset_hold_ref(*dsp, tag)); | |
549 | } | |
550 | ||
551 | int | |
552 | dsl_dataset_own_obj(dsl_pool_t *dp, uint64_t dsobj, int flags, void *owner, | |
553 | dsl_dataset_t **dsp) | |
554 | { | |
555 | int err = dsl_dataset_hold_obj(dp, dsobj, owner, dsp); | |
556 | ||
557 | ASSERT(DS_MODE_TYPE(flags) != DS_MODE_USER); | |
558 | ||
559 | if (err) | |
560 | return (err); | |
561 | if (!dsl_dataset_tryown(*dsp, DS_MODE_IS_INCONSISTENT(flags), owner)) { | |
562 | dsl_dataset_rele(*dsp, owner); | |
9babb374 | 563 | *dsp = NULL; |
b128c09f BB |
564 | return (EBUSY); |
565 | } | |
566 | return (0); | |
567 | } | |
568 | ||
569 | int | |
570 | dsl_dataset_hold(const char *name, void *tag, dsl_dataset_t **dsp) | |
34dc7c2f BB |
571 | { |
572 | dsl_dir_t *dd; | |
573 | dsl_pool_t *dp; | |
b128c09f | 574 | const char *snapname; |
34dc7c2f | 575 | uint64_t obj; |
34dc7c2f BB |
576 | int err = 0; |
577 | ||
b128c09f | 578 | err = dsl_dir_open_spa(NULL, name, FTAG, &dd, &snapname); |
34dc7c2f BB |
579 | if (err) |
580 | return (err); | |
581 | ||
582 | dp = dd->dd_pool; | |
583 | obj = dd->dd_phys->dd_head_dataset_obj; | |
584 | rw_enter(&dp->dp_config_rwlock, RW_READER); | |
b128c09f BB |
585 | if (obj) |
586 | err = dsl_dataset_get_ref(dp, obj, tag, dsp); | |
587 | else | |
34dc7c2f | 588 | err = ENOENT; |
b128c09f | 589 | if (err) |
34dc7c2f | 590 | goto out; |
34dc7c2f | 591 | |
b128c09f | 592 | err = dsl_dataset_hold_ref(*dsp, tag); |
34dc7c2f | 593 | |
b128c09f BB |
594 | /* we may be looking for a snapshot */ |
595 | if (err == 0 && snapname != NULL) { | |
596 | dsl_dataset_t *ds = NULL; | |
34dc7c2f | 597 | |
b128c09f BB |
598 | if (*snapname++ != '@') { |
599 | dsl_dataset_rele(*dsp, tag); | |
34dc7c2f BB |
600 | err = ENOENT; |
601 | goto out; | |
602 | } | |
34dc7c2f | 603 | |
b128c09f BB |
604 | dprintf("looking for snapshot '%s'\n", snapname); |
605 | err = dsl_dataset_snap_lookup(*dsp, snapname, &obj); | |
606 | if (err == 0) | |
607 | err = dsl_dataset_get_ref(dp, obj, tag, &ds); | |
608 | dsl_dataset_rele(*dsp, tag); | |
609 | ||
610 | ASSERT3U((err == 0), ==, (ds != NULL)); | |
611 | ||
612 | if (ds) { | |
613 | mutex_enter(&ds->ds_lock); | |
614 | if (ds->ds_snapname[0] == 0) | |
615 | (void) strlcpy(ds->ds_snapname, snapname, | |
616 | sizeof (ds->ds_snapname)); | |
617 | mutex_exit(&ds->ds_lock); | |
618 | err = dsl_dataset_hold_ref(ds, tag); | |
619 | *dsp = err ? NULL : ds; | |
34dc7c2f | 620 | } |
34dc7c2f | 621 | } |
34dc7c2f BB |
622 | out: |
623 | rw_exit(&dp->dp_config_rwlock); | |
624 | dsl_dir_close(dd, FTAG); | |
34dc7c2f BB |
625 | return (err); |
626 | } | |
627 | ||
628 | int | |
b128c09f | 629 | dsl_dataset_own(const char *name, int flags, void *owner, dsl_dataset_t **dsp) |
34dc7c2f | 630 | { |
b128c09f BB |
631 | int err = dsl_dataset_hold(name, owner, dsp); |
632 | if (err) | |
633 | return (err); | |
634 | if ((*dsp)->ds_phys->ds_num_children > 0 && | |
635 | !DS_MODE_IS_READONLY(flags)) { | |
636 | dsl_dataset_rele(*dsp, owner); | |
637 | return (EROFS); | |
638 | } | |
639 | if (!dsl_dataset_tryown(*dsp, DS_MODE_IS_INCONSISTENT(flags), owner)) { | |
640 | dsl_dataset_rele(*dsp, owner); | |
641 | return (EBUSY); | |
642 | } | |
643 | return (0); | |
34dc7c2f BB |
644 | } |
645 | ||
646 | void | |
647 | dsl_dataset_name(dsl_dataset_t *ds, char *name) | |
648 | { | |
649 | if (ds == NULL) { | |
650 | (void) strcpy(name, "mos"); | |
651 | } else { | |
652 | dsl_dir_name(ds->ds_dir, name); | |
653 | VERIFY(0 == dsl_dataset_get_snapname(ds)); | |
654 | if (ds->ds_snapname[0]) { | |
655 | (void) strcat(name, "@"); | |
b128c09f BB |
656 | /* |
657 | * We use a "recursive" mutex so that we | |
658 | * can call dprintf_ds() with ds_lock held. | |
659 | */ | |
34dc7c2f | 660 | if (!MUTEX_HELD(&ds->ds_lock)) { |
34dc7c2f BB |
661 | mutex_enter(&ds->ds_lock); |
662 | (void) strcat(name, ds->ds_snapname); | |
663 | mutex_exit(&ds->ds_lock); | |
664 | } else { | |
665 | (void) strcat(name, ds->ds_snapname); | |
666 | } | |
667 | } | |
668 | } | |
669 | } | |
670 | ||
671 | static int | |
672 | dsl_dataset_namelen(dsl_dataset_t *ds) | |
673 | { | |
674 | int result; | |
675 | ||
676 | if (ds == NULL) { | |
677 | result = 3; /* "mos" */ | |
678 | } else { | |
679 | result = dsl_dir_namelen(ds->ds_dir); | |
680 | VERIFY(0 == dsl_dataset_get_snapname(ds)); | |
681 | if (ds->ds_snapname[0]) { | |
682 | ++result; /* adding one for the @-sign */ | |
683 | if (!MUTEX_HELD(&ds->ds_lock)) { | |
34dc7c2f BB |
684 | mutex_enter(&ds->ds_lock); |
685 | result += strlen(ds->ds_snapname); | |
686 | mutex_exit(&ds->ds_lock); | |
687 | } else { | |
688 | result += strlen(ds->ds_snapname); | |
689 | } | |
690 | } | |
691 | } | |
692 | ||
693 | return (result); | |
694 | } | |
695 | ||
696 | void | |
b128c09f | 697 | dsl_dataset_drop_ref(dsl_dataset_t *ds, void *tag) |
34dc7c2f | 698 | { |
34dc7c2f BB |
699 | dmu_buf_rele(ds->ds_dbuf, tag); |
700 | } | |
701 | ||
702 | void | |
b128c09f BB |
703 | dsl_dataset_rele(dsl_dataset_t *ds, void *tag) |
704 | { | |
705 | if (!dsl_pool_sync_context(ds->ds_dir->dd_pool)) { | |
706 | rw_exit(&ds->ds_rwlock); | |
707 | } | |
708 | dsl_dataset_drop_ref(ds, tag); | |
709 | } | |
710 | ||
711 | void | |
712 | dsl_dataset_disown(dsl_dataset_t *ds, void *owner) | |
34dc7c2f | 713 | { |
b128c09f BB |
714 | ASSERT((ds->ds_owner == owner && ds->ds_dbuf) || |
715 | (DSL_DATASET_IS_DESTROYED(ds) && ds->ds_dbuf == NULL)); | |
716 | ||
34dc7c2f | 717 | mutex_enter(&ds->ds_lock); |
b128c09f BB |
718 | ds->ds_owner = NULL; |
719 | if (RW_WRITE_HELD(&ds->ds_rwlock)) { | |
720 | rw_exit(&ds->ds_rwlock); | |
721 | cv_broadcast(&ds->ds_exclusive_cv); | |
722 | } | |
34dc7c2f | 723 | mutex_exit(&ds->ds_lock); |
b128c09f BB |
724 | if (ds->ds_dbuf) |
725 | dsl_dataset_drop_ref(ds, owner); | |
726 | else | |
727 | dsl_dataset_evict(ds->ds_dbuf, ds); | |
34dc7c2f BB |
728 | } |
729 | ||
730 | boolean_t | |
b128c09f | 731 | dsl_dataset_tryown(dsl_dataset_t *ds, boolean_t inconsistentok, void *owner) |
34dc7c2f | 732 | { |
b128c09f BB |
733 | boolean_t gotit = FALSE; |
734 | ||
34dc7c2f | 735 | mutex_enter(&ds->ds_lock); |
b128c09f BB |
736 | if (ds->ds_owner == NULL && |
737 | (!DS_IS_INCONSISTENT(ds) || inconsistentok)) { | |
738 | ds->ds_owner = owner; | |
739 | if (!dsl_pool_sync_context(ds->ds_dir->dd_pool)) | |
740 | rw_exit(&ds->ds_rwlock); | |
741 | gotit = TRUE; | |
34dc7c2f BB |
742 | } |
743 | mutex_exit(&ds->ds_lock); | |
b128c09f | 744 | return (gotit); |
34dc7c2f BB |
745 | } |
746 | ||
747 | void | |
b128c09f | 748 | dsl_dataset_make_exclusive(dsl_dataset_t *ds, void *owner) |
34dc7c2f | 749 | { |
b128c09f BB |
750 | ASSERT3P(owner, ==, ds->ds_owner); |
751 | if (!RW_WRITE_HELD(&ds->ds_rwlock)) | |
752 | rw_enter(&ds->ds_rwlock, RW_WRITER); | |
34dc7c2f BB |
753 | } |
754 | ||
755 | uint64_t | |
b128c09f | 756 | dsl_dataset_create_sync_dd(dsl_dir_t *dd, dsl_dataset_t *origin, |
34dc7c2f BB |
757 | uint64_t flags, dmu_tx_t *tx) |
758 | { | |
759 | dsl_pool_t *dp = dd->dd_pool; | |
760 | dmu_buf_t *dbuf; | |
761 | dsl_dataset_phys_t *dsphys; | |
762 | uint64_t dsobj; | |
763 | objset_t *mos = dp->dp_meta_objset; | |
764 | ||
b128c09f BB |
765 | if (origin == NULL) |
766 | origin = dp->dp_origin_snap; | |
767 | ||
34dc7c2f BB |
768 | ASSERT(origin == NULL || origin->ds_dir->dd_pool == dp); |
769 | ASSERT(origin == NULL || origin->ds_phys->ds_num_children > 0); | |
770 | ASSERT(dmu_tx_is_syncing(tx)); | |
771 | ASSERT(dd->dd_phys->dd_head_dataset_obj == 0); | |
772 | ||
773 | dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, | |
774 | DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); | |
775 | VERIFY(0 == dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); | |
776 | dmu_buf_will_dirty(dbuf, tx); | |
777 | dsphys = dbuf->db_data; | |
b128c09f | 778 | bzero(dsphys, sizeof (dsl_dataset_phys_t)); |
34dc7c2f BB |
779 | dsphys->ds_dir_obj = dd->dd_object; |
780 | dsphys->ds_flags = flags; | |
781 | dsphys->ds_fsid_guid = unique_create(); | |
782 | (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, | |
783 | sizeof (dsphys->ds_guid)); | |
784 | dsphys->ds_snapnames_zapobj = | |
785 | zap_create_norm(mos, U8_TEXTPREP_TOUPPER, DMU_OT_DSL_DS_SNAP_MAP, | |
786 | DMU_OT_NONE, 0, tx); | |
787 | dsphys->ds_creation_time = gethrestime_sec(); | |
b128c09f | 788 | dsphys->ds_creation_txg = tx->tx_txg == TXG_INITIAL ? 1 : tx->tx_txg; |
34dc7c2f BB |
789 | dsphys->ds_deadlist_obj = |
790 | bplist_create(mos, DSL_DEADLIST_BLOCKSIZE, tx); | |
791 | ||
792 | if (origin) { | |
793 | dsphys->ds_prev_snap_obj = origin->ds_object; | |
794 | dsphys->ds_prev_snap_txg = | |
795 | origin->ds_phys->ds_creation_txg; | |
796 | dsphys->ds_used_bytes = | |
797 | origin->ds_phys->ds_used_bytes; | |
798 | dsphys->ds_compressed_bytes = | |
799 | origin->ds_phys->ds_compressed_bytes; | |
800 | dsphys->ds_uncompressed_bytes = | |
801 | origin->ds_phys->ds_uncompressed_bytes; | |
802 | dsphys->ds_bp = origin->ds_phys->ds_bp; | |
803 | dsphys->ds_flags |= origin->ds_phys->ds_flags; | |
804 | ||
805 | dmu_buf_will_dirty(origin->ds_dbuf, tx); | |
806 | origin->ds_phys->ds_num_children++; | |
807 | ||
b128c09f BB |
808 | if (spa_version(dp->dp_spa) >= SPA_VERSION_NEXT_CLONES) { |
809 | if (origin->ds_phys->ds_next_clones_obj == 0) { | |
810 | origin->ds_phys->ds_next_clones_obj = | |
811 | zap_create(mos, | |
812 | DMU_OT_NEXT_CLONES, DMU_OT_NONE, 0, tx); | |
813 | } | |
814 | VERIFY(0 == zap_add_int(mos, | |
815 | origin->ds_phys->ds_next_clones_obj, | |
816 | dsobj, tx)); | |
817 | } | |
818 | ||
34dc7c2f BB |
819 | dmu_buf_will_dirty(dd->dd_dbuf, tx); |
820 | dd->dd_phys->dd_origin_obj = origin->ds_object; | |
821 | } | |
822 | ||
823 | if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE) | |
824 | dsphys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; | |
825 | ||
826 | dmu_buf_rele(dbuf, FTAG); | |
827 | ||
828 | dmu_buf_will_dirty(dd->dd_dbuf, tx); | |
829 | dd->dd_phys->dd_head_dataset_obj = dsobj; | |
830 | ||
831 | return (dsobj); | |
832 | } | |
833 | ||
834 | uint64_t | |
835 | dsl_dataset_create_sync(dsl_dir_t *pdd, const char *lastname, | |
836 | dsl_dataset_t *origin, uint64_t flags, cred_t *cr, dmu_tx_t *tx) | |
837 | { | |
838 | dsl_pool_t *dp = pdd->dd_pool; | |
839 | uint64_t dsobj, ddobj; | |
840 | dsl_dir_t *dd; | |
841 | ||
842 | ASSERT(lastname[0] != '@'); | |
843 | ||
b128c09f | 844 | ddobj = dsl_dir_create_sync(dp, pdd, lastname, tx); |
34dc7c2f BB |
845 | VERIFY(0 == dsl_dir_open_obj(dp, ddobj, lastname, FTAG, &dd)); |
846 | ||
b128c09f | 847 | dsobj = dsl_dataset_create_sync_dd(dd, origin, flags, tx); |
34dc7c2f BB |
848 | |
849 | dsl_deleg_set_create_perms(dd, tx, cr); | |
850 | ||
851 | dsl_dir_close(dd, FTAG); | |
852 | ||
853 | return (dsobj); | |
854 | } | |
855 | ||
856 | struct destroyarg { | |
857 | dsl_sync_task_group_t *dstg; | |
858 | char *snapname; | |
859 | char *failed; | |
45d1cae3 | 860 | boolean_t defer; |
34dc7c2f BB |
861 | }; |
862 | ||
863 | static int | |
864 | dsl_snapshot_destroy_one(char *name, void *arg) | |
865 | { | |
866 | struct destroyarg *da = arg; | |
867 | dsl_dataset_t *ds; | |
34dc7c2f | 868 | int err; |
45d1cae3 BB |
869 | char *dsname; |
870 | size_t buflen; | |
871 | ||
872 | /* alloc a buffer to hold name@snapname, plus the terminating NULL */ | |
873 | buflen = strlen(name) + strlen(da->snapname) + 2; | |
874 | dsname = kmem_alloc(buflen, KM_SLEEP); | |
875 | (void) snprintf(dsname, buflen, "%s@%s", name, da->snapname); | |
876 | err = dsl_dataset_own(dsname, DS_MODE_READONLY | DS_MODE_INCONSISTENT, | |
34dc7c2f | 877 | da->dstg, &ds); |
45d1cae3 | 878 | kmem_free(dsname, buflen); |
b128c09f | 879 | if (err == 0) { |
45d1cae3 BB |
880 | struct dsl_ds_destroyarg *dsda; |
881 | ||
b128c09f BB |
882 | dsl_dataset_make_exclusive(ds, da->dstg); |
883 | if (ds->ds_user_ptr) { | |
884 | ds->ds_user_evict_func(ds, ds->ds_user_ptr); | |
885 | ds->ds_user_ptr = NULL; | |
886 | } | |
45d1cae3 BB |
887 | dsda = kmem_zalloc(sizeof (struct dsl_ds_destroyarg), KM_SLEEP); |
888 | dsda->ds = ds; | |
889 | dsda->defer = da->defer; | |
b128c09f | 890 | dsl_sync_task_create(da->dstg, dsl_dataset_destroy_check, |
45d1cae3 | 891 | dsl_dataset_destroy_sync, dsda, da->dstg, 0); |
b128c09f BB |
892 | } else if (err == ENOENT) { |
893 | err = 0; | |
894 | } else { | |
34dc7c2f | 895 | (void) strcpy(da->failed, name); |
34dc7c2f | 896 | } |
b128c09f | 897 | return (err); |
34dc7c2f BB |
898 | } |
899 | ||
900 | /* | |
901 | * Destroy 'snapname' in all descendants of 'fsname'. | |
902 | */ | |
903 | #pragma weak dmu_snapshots_destroy = dsl_snapshots_destroy | |
904 | int | |
45d1cae3 | 905 | dsl_snapshots_destroy(char *fsname, char *snapname, boolean_t defer) |
34dc7c2f BB |
906 | { |
907 | int err; | |
908 | struct destroyarg da; | |
909 | dsl_sync_task_t *dst; | |
910 | spa_t *spa; | |
911 | ||
912 | err = spa_open(fsname, &spa, FTAG); | |
913 | if (err) | |
914 | return (err); | |
915 | da.dstg = dsl_sync_task_group_create(spa_get_dsl(spa)); | |
916 | da.snapname = snapname; | |
917 | da.failed = fsname; | |
45d1cae3 | 918 | da.defer = defer; |
34dc7c2f BB |
919 | |
920 | err = dmu_objset_find(fsname, | |
921 | dsl_snapshot_destroy_one, &da, DS_FIND_CHILDREN); | |
922 | ||
923 | if (err == 0) | |
924 | err = dsl_sync_task_group_wait(da.dstg); | |
925 | ||
926 | for (dst = list_head(&da.dstg->dstg_tasks); dst; | |
927 | dst = list_next(&da.dstg->dstg_tasks, dst)) { | |
45d1cae3 BB |
928 | struct dsl_ds_destroyarg *dsda = dst->dst_arg1; |
929 | dsl_dataset_t *ds = dsda->ds; | |
930 | ||
b128c09f BB |
931 | /* |
932 | * Return the file system name that triggered the error | |
933 | */ | |
34dc7c2f BB |
934 | if (dst->dst_err) { |
935 | dsl_dataset_name(ds, fsname); | |
936 | *strchr(fsname, '@') = '\0'; | |
937 | } | |
45d1cae3 | 938 | ASSERT3P(dsda->rm_origin, ==, NULL); |
b128c09f | 939 | dsl_dataset_disown(ds, da.dstg); |
45d1cae3 | 940 | kmem_free(dsda, sizeof (struct dsl_ds_destroyarg)); |
34dc7c2f BB |
941 | } |
942 | ||
943 | dsl_sync_task_group_destroy(da.dstg); | |
944 | spa_close(spa, FTAG); | |
945 | return (err); | |
946 | } | |
947 | ||
45d1cae3 BB |
948 | static boolean_t |
949 | dsl_dataset_might_destroy_origin(dsl_dataset_t *ds) | |
950 | { | |
951 | boolean_t might_destroy = B_FALSE; | |
952 | ||
953 | mutex_enter(&ds->ds_lock); | |
954 | if (ds->ds_phys->ds_num_children == 2 && ds->ds_userrefs == 0 && | |
955 | DS_IS_DEFER_DESTROY(ds)) | |
956 | might_destroy = B_TRUE; | |
957 | mutex_exit(&ds->ds_lock); | |
958 | ||
959 | return (might_destroy); | |
960 | } | |
961 | ||
962 | #ifdef _KERNEL | |
963 | static int | |
964 | dsl_dataset_zvol_cleanup(dsl_dataset_t *ds, const char *name) | |
965 | { | |
966 | int error; | |
967 | objset_t *os; | |
968 | ||
969 | error = dmu_objset_open_ds(ds, DMU_OST_ANY, &os); | |
970 | if (error) | |
971 | return (error); | |
972 | ||
973 | if (dmu_objset_type(os) == DMU_OST_ZVOL) | |
974 | error = zvol_remove_minor(name); | |
975 | dmu_objset_close(os); | |
976 | ||
977 | return (error); | |
978 | } | |
979 | #endif | |
980 | ||
981 | /* | |
982 | * If we're removing a clone, and these three conditions are true: | |
983 | * 1) the clone's origin has no other children | |
984 | * 2) the clone's origin has no user references | |
985 | * 3) the clone's origin has been marked for deferred destruction | |
986 | * Then, prepare to remove the origin as part of this sync task group. | |
987 | */ | |
988 | static int | |
989 | dsl_dataset_origin_rm_prep(struct dsl_ds_destroyarg *dsda, void *tag) | |
990 | { | |
991 | dsl_dataset_t *ds = dsda->ds; | |
992 | dsl_dataset_t *origin = ds->ds_prev; | |
993 | ||
994 | if (dsl_dataset_might_destroy_origin(origin)) { | |
995 | char *name; | |
996 | int namelen; | |
997 | int error; | |
998 | ||
999 | namelen = dsl_dataset_namelen(origin) + 1; | |
1000 | name = kmem_alloc(namelen, KM_SLEEP); | |
1001 | dsl_dataset_name(origin, name); | |
1002 | #ifdef _KERNEL | |
1003 | error = zfs_unmount_snap(name, NULL); | |
1004 | if (error) { | |
1005 | kmem_free(name, namelen); | |
1006 | return (error); | |
1007 | } | |
1008 | error = dsl_dataset_zvol_cleanup(origin, name); | |
1009 | if (error) { | |
1010 | kmem_free(name, namelen); | |
1011 | return (error); | |
1012 | } | |
1013 | #endif | |
1014 | error = dsl_dataset_own(name, | |
1015 | DS_MODE_READONLY | DS_MODE_INCONSISTENT, | |
1016 | tag, &origin); | |
1017 | kmem_free(name, namelen); | |
1018 | if (error) | |
1019 | return (error); | |
1020 | dsda->rm_origin = origin; | |
1021 | dsl_dataset_make_exclusive(origin, tag); | |
1022 | } | |
1023 | ||
1024 | return (0); | |
1025 | } | |
1026 | ||
34dc7c2f | 1027 | /* |
b128c09f BB |
1028 | * ds must be opened as OWNER. On return (whether successful or not), |
1029 | * ds will be closed and caller can no longer dereference it. | |
34dc7c2f BB |
1030 | */ |
1031 | int | |
45d1cae3 | 1032 | dsl_dataset_destroy(dsl_dataset_t *ds, void *tag, boolean_t defer) |
34dc7c2f BB |
1033 | { |
1034 | int err; | |
1035 | dsl_sync_task_group_t *dstg; | |
1036 | objset_t *os; | |
1037 | dsl_dir_t *dd; | |
1038 | uint64_t obj; | |
45d1cae3 BB |
1039 | struct dsl_ds_destroyarg dsda = {0}; |
1040 | ||
1041 | dsda.ds = ds; | |
34dc7c2f | 1042 | |
34dc7c2f BB |
1043 | if (dsl_dataset_is_snapshot(ds)) { |
1044 | /* Destroying a snapshot is simpler */ | |
b128c09f BB |
1045 | dsl_dataset_make_exclusive(ds, tag); |
1046 | ||
1047 | if (ds->ds_user_ptr) { | |
1048 | ds->ds_user_evict_func(ds, ds->ds_user_ptr); | |
1049 | ds->ds_user_ptr = NULL; | |
1050 | } | |
45d1cae3 BB |
1051 | /* NOTE: defer is always B_FALSE for non-snapshots */ |
1052 | dsda.defer = defer; | |
34dc7c2f BB |
1053 | err = dsl_sync_task_do(ds->ds_dir->dd_pool, |
1054 | dsl_dataset_destroy_check, dsl_dataset_destroy_sync, | |
45d1cae3 BB |
1055 | &dsda, tag, 0); |
1056 | ASSERT3P(dsda.rm_origin, ==, NULL); | |
34dc7c2f BB |
1057 | goto out; |
1058 | } | |
1059 | ||
1060 | dd = ds->ds_dir; | |
1061 | ||
1062 | /* | |
1063 | * Check for errors and mark this ds as inconsistent, in | |
1064 | * case we crash while freeing the objects. | |
1065 | */ | |
1066 | err = dsl_sync_task_do(dd->dd_pool, dsl_dataset_destroy_begin_check, | |
1067 | dsl_dataset_destroy_begin_sync, ds, NULL, 0); | |
1068 | if (err) | |
1069 | goto out; | |
1070 | ||
1071 | err = dmu_objset_open_ds(ds, DMU_OST_ANY, &os); | |
1072 | if (err) | |
1073 | goto out; | |
1074 | ||
1075 | /* | |
1076 | * remove the objects in open context, so that we won't | |
1077 | * have too much to do in syncing context. | |
1078 | */ | |
1079 | for (obj = 0; err == 0; err = dmu_object_next(os, &obj, FALSE, | |
1080 | ds->ds_phys->ds_prev_snap_txg)) { | |
b128c09f BB |
1081 | /* |
1082 | * Ignore errors, if there is not enough disk space | |
1083 | * we will deal with it in dsl_dataset_destroy_sync(). | |
1084 | */ | |
1085 | (void) dmu_free_object(os, obj); | |
34dc7c2f | 1086 | } |
34dc7c2f | 1087 | |
9babb374 BB |
1088 | /* |
1089 | * We need to sync out all in-flight IO before we try to evict | |
1090 | * (the dataset evict func is trying to clear the cached entries | |
1091 | * for this dataset in the ARC). | |
1092 | */ | |
1093 | txg_wait_synced(dd->dd_pool, 0); | |
1094 | ||
1095 | /* | |
1096 | * If we managed to free all the objects in open | |
1097 | * context, the user space accounting should be zero. | |
1098 | */ | |
1099 | if (ds->ds_phys->ds_bp.blk_fill == 0 && | |
1100 | dmu_objset_userused_enabled(os->os)) { | |
1101 | uint64_t count; | |
1102 | ||
1103 | ASSERT(zap_count(os, DMU_USERUSED_OBJECT, &count) != 0 || | |
1104 | count == 0); | |
1105 | ASSERT(zap_count(os, DMU_GROUPUSED_OBJECT, &count) != 0 || | |
1106 | count == 0); | |
1107 | } | |
1108 | ||
34dc7c2f BB |
1109 | dmu_objset_close(os); |
1110 | if (err != ESRCH) | |
1111 | goto out; | |
1112 | ||
34dc7c2f BB |
1113 | rw_enter(&dd->dd_pool->dp_config_rwlock, RW_READER); |
1114 | err = dsl_dir_open_obj(dd->dd_pool, dd->dd_object, NULL, FTAG, &dd); | |
1115 | rw_exit(&dd->dd_pool->dp_config_rwlock); | |
1116 | ||
1117 | if (err) | |
1118 | goto out; | |
1119 | ||
b128c09f BB |
1120 | if (ds->ds_user_ptr) { |
1121 | /* | |
1122 | * We need to sync out all in-flight IO before we try | |
1123 | * to evict (the dataset evict func is trying to clear | |
1124 | * the cached entries for this dataset in the ARC). | |
1125 | */ | |
1126 | txg_wait_synced(dd->dd_pool, 0); | |
1127 | } | |
1128 | ||
34dc7c2f BB |
1129 | /* |
1130 | * Blow away the dsl_dir + head dataset. | |
1131 | */ | |
b128c09f BB |
1132 | dsl_dataset_make_exclusive(ds, tag); |
1133 | if (ds->ds_user_ptr) { | |
1134 | ds->ds_user_evict_func(ds, ds->ds_user_ptr); | |
1135 | ds->ds_user_ptr = NULL; | |
1136 | } | |
45d1cae3 BB |
1137 | |
1138 | /* | |
1139 | * If we're removing a clone, we might also need to remove its | |
1140 | * origin. | |
1141 | */ | |
1142 | do { | |
1143 | dsda.need_prep = B_FALSE; | |
1144 | if (dsl_dir_is_clone(dd)) { | |
1145 | err = dsl_dataset_origin_rm_prep(&dsda, tag); | |
1146 | if (err) { | |
1147 | dsl_dir_close(dd, FTAG); | |
1148 | goto out; | |
1149 | } | |
1150 | } | |
1151 | ||
1152 | dstg = dsl_sync_task_group_create(ds->ds_dir->dd_pool); | |
1153 | dsl_sync_task_create(dstg, dsl_dataset_destroy_check, | |
1154 | dsl_dataset_destroy_sync, &dsda, tag, 0); | |
1155 | dsl_sync_task_create(dstg, dsl_dir_destroy_check, | |
1156 | dsl_dir_destroy_sync, dd, FTAG, 0); | |
1157 | err = dsl_sync_task_group_wait(dstg); | |
1158 | dsl_sync_task_group_destroy(dstg); | |
1159 | ||
1160 | /* | |
1161 | * We could be racing against 'zfs release' or 'zfs destroy -d' | |
1162 | * on the origin snap, in which case we can get EBUSY if we | |
1163 | * needed to destroy the origin snap but were not ready to | |
1164 | * do so. | |
1165 | */ | |
1166 | if (dsda.need_prep) { | |
1167 | ASSERT(err == EBUSY); | |
1168 | ASSERT(dsl_dir_is_clone(dd)); | |
1169 | ASSERT(dsda.rm_origin == NULL); | |
1170 | } | |
1171 | } while (dsda.need_prep); | |
1172 | ||
1173 | if (dsda.rm_origin != NULL) | |
1174 | dsl_dataset_disown(dsda.rm_origin, tag); | |
1175 | ||
b128c09f | 1176 | /* if it is successful, dsl_dir_destroy_sync will close the dd */ |
34dc7c2f BB |
1177 | if (err) |
1178 | dsl_dir_close(dd, FTAG); | |
1179 | out: | |
b128c09f | 1180 | dsl_dataset_disown(ds, tag); |
34dc7c2f BB |
1181 | return (err); |
1182 | } | |
1183 | ||
1184 | int | |
1185 | dsl_dataset_rollback(dsl_dataset_t *ds, dmu_objset_type_t ost) | |
1186 | { | |
b128c09f BB |
1187 | int err; |
1188 | ||
1189 | ASSERT(ds->ds_owner); | |
34dc7c2f | 1190 | |
b128c09f BB |
1191 | dsl_dataset_make_exclusive(ds, ds->ds_owner); |
1192 | err = dsl_sync_task_do(ds->ds_dir->dd_pool, | |
34dc7c2f | 1193 | dsl_dataset_rollback_check, dsl_dataset_rollback_sync, |
b128c09f BB |
1194 | ds, &ost, 0); |
1195 | /* drop exclusive access */ | |
1196 | mutex_enter(&ds->ds_lock); | |
1197 | rw_exit(&ds->ds_rwlock); | |
1198 | cv_broadcast(&ds->ds_exclusive_cv); | |
1199 | mutex_exit(&ds->ds_lock); | |
1200 | return (err); | |
34dc7c2f BB |
1201 | } |
1202 | ||
1203 | void * | |
1204 | dsl_dataset_set_user_ptr(dsl_dataset_t *ds, | |
1205 | void *p, dsl_dataset_evict_func_t func) | |
1206 | { | |
1207 | void *old; | |
1208 | ||
1209 | mutex_enter(&ds->ds_lock); | |
1210 | old = ds->ds_user_ptr; | |
1211 | if (old == NULL) { | |
1212 | ds->ds_user_ptr = p; | |
1213 | ds->ds_user_evict_func = func; | |
1214 | } | |
1215 | mutex_exit(&ds->ds_lock); | |
1216 | return (old); | |
1217 | } | |
1218 | ||
1219 | void * | |
1220 | dsl_dataset_get_user_ptr(dsl_dataset_t *ds) | |
1221 | { | |
1222 | return (ds->ds_user_ptr); | |
1223 | } | |
1224 | ||
34dc7c2f BB |
1225 | blkptr_t * |
1226 | dsl_dataset_get_blkptr(dsl_dataset_t *ds) | |
1227 | { | |
1228 | return (&ds->ds_phys->ds_bp); | |
1229 | } | |
1230 | ||
1231 | void | |
1232 | dsl_dataset_set_blkptr(dsl_dataset_t *ds, blkptr_t *bp, dmu_tx_t *tx) | |
1233 | { | |
1234 | ASSERT(dmu_tx_is_syncing(tx)); | |
1235 | /* If it's the meta-objset, set dp_meta_rootbp */ | |
1236 | if (ds == NULL) { | |
1237 | tx->tx_pool->dp_meta_rootbp = *bp; | |
1238 | } else { | |
1239 | dmu_buf_will_dirty(ds->ds_dbuf, tx); | |
1240 | ds->ds_phys->ds_bp = *bp; | |
1241 | } | |
1242 | } | |
1243 | ||
1244 | spa_t * | |
1245 | dsl_dataset_get_spa(dsl_dataset_t *ds) | |
1246 | { | |
1247 | return (ds->ds_dir->dd_pool->dp_spa); | |
1248 | } | |
1249 | ||
1250 | void | |
1251 | dsl_dataset_dirty(dsl_dataset_t *ds, dmu_tx_t *tx) | |
1252 | { | |
1253 | dsl_pool_t *dp; | |
1254 | ||
1255 | if (ds == NULL) /* this is the meta-objset */ | |
1256 | return; | |
1257 | ||
1258 | ASSERT(ds->ds_user_ptr != NULL); | |
1259 | ||
1260 | if (ds->ds_phys->ds_next_snap_obj != 0) | |
1261 | panic("dirtying snapshot!"); | |
1262 | ||
1263 | dp = ds->ds_dir->dd_pool; | |
1264 | ||
1265 | if (txg_list_add(&dp->dp_dirty_datasets, ds, tx->tx_txg) == 0) { | |
1266 | /* up the hold count until we can be written out */ | |
1267 | dmu_buf_add_ref(ds->ds_dbuf, ds); | |
1268 | } | |
1269 | } | |
1270 | ||
1271 | /* | |
1272 | * The unique space in the head dataset can be calculated by subtracting | |
1273 | * the space used in the most recent snapshot, that is still being used | |
1274 | * in this file system, from the space currently in use. To figure out | |
1275 | * the space in the most recent snapshot still in use, we need to take | |
1276 | * the total space used in the snapshot and subtract out the space that | |
1277 | * has been freed up since the snapshot was taken. | |
1278 | */ | |
1279 | static void | |
1280 | dsl_dataset_recalc_head_uniq(dsl_dataset_t *ds) | |
1281 | { | |
1282 | uint64_t mrs_used; | |
1283 | uint64_t dlused, dlcomp, dluncomp; | |
1284 | ||
1285 | ASSERT(ds->ds_object == ds->ds_dir->dd_phys->dd_head_dataset_obj); | |
1286 | ||
1287 | if (ds->ds_phys->ds_prev_snap_obj != 0) | |
1288 | mrs_used = ds->ds_prev->ds_phys->ds_used_bytes; | |
1289 | else | |
1290 | mrs_used = 0; | |
1291 | ||
1292 | VERIFY(0 == bplist_space(&ds->ds_deadlist, &dlused, &dlcomp, | |
1293 | &dluncomp)); | |
1294 | ||
1295 | ASSERT3U(dlused, <=, mrs_used); | |
1296 | ds->ds_phys->ds_unique_bytes = | |
1297 | ds->ds_phys->ds_used_bytes - (mrs_used - dlused); | |
1298 | ||
1299 | if (!DS_UNIQUE_IS_ACCURATE(ds) && | |
1300 | spa_version(ds->ds_dir->dd_pool->dp_spa) >= | |
1301 | SPA_VERSION_UNIQUE_ACCURATE) | |
1302 | ds->ds_phys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; | |
1303 | } | |
1304 | ||
1305 | static uint64_t | |
1306 | dsl_dataset_unique(dsl_dataset_t *ds) | |
1307 | { | |
1308 | if (!DS_UNIQUE_IS_ACCURATE(ds) && !dsl_dataset_is_snapshot(ds)) | |
1309 | dsl_dataset_recalc_head_uniq(ds); | |
1310 | ||
1311 | return (ds->ds_phys->ds_unique_bytes); | |
1312 | } | |
1313 | ||
1314 | struct killarg { | |
b128c09f | 1315 | dsl_dataset_t *ds; |
34dc7c2f BB |
1316 | zio_t *zio; |
1317 | dmu_tx_t *tx; | |
1318 | }; | |
1319 | ||
b128c09f | 1320 | /* ARGSUSED */ |
34dc7c2f | 1321 | static int |
b128c09f BB |
1322 | kill_blkptr(spa_t *spa, blkptr_t *bp, const zbookmark_t *zb, |
1323 | const dnode_phys_t *dnp, void *arg) | |
34dc7c2f BB |
1324 | { |
1325 | struct killarg *ka = arg; | |
34dc7c2f | 1326 | |
b128c09f BB |
1327 | if (bp == NULL) |
1328 | return (0); | |
1329 | ||
9babb374 BB |
1330 | if ((zb->zb_level == -1ULL && zb->zb_blkid != 0) || |
1331 | (zb->zb_object != 0 && dnp == NULL)) { | |
1332 | /* | |
1333 | * It's a block in the intent log. It has no | |
1334 | * accounting, so just free it. | |
1335 | */ | |
1336 | VERIFY3U(0, ==, dsl_free(ka->zio, ka->tx->tx_pool, | |
1337 | ka->tx->tx_txg, bp, NULL, NULL, ARC_NOWAIT)); | |
1338 | } else { | |
1339 | ASSERT3U(bp->blk_birth, >, ka->ds->ds_phys->ds_prev_snap_txg); | |
1340 | (void) dsl_dataset_block_kill(ka->ds, bp, ka->zio, ka->tx); | |
1341 | } | |
34dc7c2f | 1342 | |
34dc7c2f BB |
1343 | return (0); |
1344 | } | |
1345 | ||
1346 | /* ARGSUSED */ | |
1347 | static int | |
1348 | dsl_dataset_rollback_check(void *arg1, void *arg2, dmu_tx_t *tx) | |
1349 | { | |
1350 | dsl_dataset_t *ds = arg1; | |
1351 | dmu_objset_type_t *ost = arg2; | |
1352 | ||
1353 | /* | |
1354 | * We can only roll back to emptyness if it is a ZPL objset. | |
1355 | */ | |
45d1cae3 BB |
1356 | if (*ost != DMU_OST_ZFS && |
1357 | ds->ds_phys->ds_prev_snap_txg < TXG_INITIAL) | |
34dc7c2f BB |
1358 | return (EINVAL); |
1359 | ||
1360 | /* | |
1361 | * This must not be a snapshot. | |
1362 | */ | |
1363 | if (ds->ds_phys->ds_next_snap_obj != 0) | |
1364 | return (EINVAL); | |
1365 | ||
1366 | /* | |
b128c09f | 1367 | * If we made changes this txg, traverse_dataset won't find |
34dc7c2f BB |
1368 | * them. Try again. |
1369 | */ | |
1370 | if (ds->ds_phys->ds_bp.blk_birth >= tx->tx_txg) | |
1371 | return (EAGAIN); | |
1372 | ||
1373 | return (0); | |
1374 | } | |
1375 | ||
1376 | /* ARGSUSED */ | |
1377 | static void | |
1378 | dsl_dataset_rollback_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) | |
1379 | { | |
1380 | dsl_dataset_t *ds = arg1; | |
1381 | dmu_objset_type_t *ost = arg2; | |
1382 | objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; | |
1383 | ||
1384 | dmu_buf_will_dirty(ds->ds_dbuf, tx); | |
1385 | ||
34dc7c2f | 1386 | if (ds->ds_user_ptr != NULL) { |
34dc7c2f BB |
1387 | /* |
1388 | * We need to make sure that the objset_impl_t is reopened after | |
1389 | * we do the rollback, otherwise it will have the wrong | |
1390 | * objset_phys_t. Normally this would happen when this | |
b128c09f | 1391 | * dataset-open is closed, thus causing the |
34dc7c2f BB |
1392 | * dataset to be immediately evicted. But when doing "zfs recv |
1393 | * -F", we reopen the objset before that, so that there is no | |
1394 | * window where the dataset is closed and inconsistent. | |
1395 | */ | |
1396 | ds->ds_user_evict_func(ds, ds->ds_user_ptr); | |
1397 | ds->ds_user_ptr = NULL; | |
1398 | } | |
1399 | ||
b128c09f BB |
1400 | /* Transfer space that was freed since last snap back to the head. */ |
1401 | { | |
1402 | uint64_t used; | |
1403 | ||
1404 | VERIFY(0 == bplist_space_birthrange(&ds->ds_deadlist, | |
1405 | ds->ds_origin_txg, UINT64_MAX, &used)); | |
1406 | dsl_dir_transfer_space(ds->ds_dir, used, | |
1407 | DD_USED_SNAP, DD_USED_HEAD, tx); | |
1408 | } | |
1409 | ||
34dc7c2f BB |
1410 | /* Zero out the deadlist. */ |
1411 | bplist_close(&ds->ds_deadlist); | |
1412 | bplist_destroy(mos, ds->ds_phys->ds_deadlist_obj, tx); | |
1413 | ds->ds_phys->ds_deadlist_obj = | |
1414 | bplist_create(mos, DSL_DEADLIST_BLOCKSIZE, tx); | |
1415 | VERIFY(0 == bplist_open(&ds->ds_deadlist, mos, | |
1416 | ds->ds_phys->ds_deadlist_obj)); | |
1417 | ||
1418 | { | |
9babb374 BB |
1419 | /* |
1420 | * Free blkptrs that we gave birth to - this covers | |
1421 | * claimed but not played log blocks too. | |
1422 | */ | |
34dc7c2f | 1423 | zio_t *zio; |
34dc7c2f | 1424 | struct killarg ka; |
34dc7c2f BB |
1425 | |
1426 | zio = zio_root(tx->tx_pool->dp_spa, NULL, NULL, | |
1427 | ZIO_FLAG_MUSTSUCCEED); | |
b128c09f | 1428 | ka.ds = ds; |
34dc7c2f BB |
1429 | ka.zio = zio; |
1430 | ka.tx = tx; | |
b128c09f BB |
1431 | (void) traverse_dataset(ds, ds->ds_phys->ds_prev_snap_txg, |
1432 | TRAVERSE_POST, kill_blkptr, &ka); | |
34dc7c2f | 1433 | (void) zio_wait(zio); |
34dc7c2f BB |
1434 | } |
1435 | ||
9babb374 | 1436 | ASSERT(!DS_UNIQUE_IS_ACCURATE(ds) || ds->ds_phys->ds_unique_bytes == 0); |
b128c09f BB |
1437 | |
1438 | if (ds->ds_prev && ds->ds_prev != ds->ds_dir->dd_pool->dp_origin_snap) { | |
34dc7c2f | 1439 | /* Change our contents to that of the prev snapshot */ |
b128c09f | 1440 | |
34dc7c2f BB |
1441 | ASSERT3U(ds->ds_prev->ds_object, ==, |
1442 | ds->ds_phys->ds_prev_snap_obj); | |
b128c09f BB |
1443 | ASSERT3U(ds->ds_phys->ds_used_bytes, <=, |
1444 | ds->ds_prev->ds_phys->ds_used_bytes); | |
1445 | ||
34dc7c2f BB |
1446 | ds->ds_phys->ds_bp = ds->ds_prev->ds_phys->ds_bp; |
1447 | ds->ds_phys->ds_used_bytes = | |
1448 | ds->ds_prev->ds_phys->ds_used_bytes; | |
1449 | ds->ds_phys->ds_compressed_bytes = | |
1450 | ds->ds_prev->ds_phys->ds_compressed_bytes; | |
1451 | ds->ds_phys->ds_uncompressed_bytes = | |
1452 | ds->ds_prev->ds_phys->ds_uncompressed_bytes; | |
1453 | ds->ds_phys->ds_flags = ds->ds_prev->ds_phys->ds_flags; | |
34dc7c2f BB |
1454 | |
1455 | if (ds->ds_prev->ds_phys->ds_next_snap_obj == ds->ds_object) { | |
1456 | dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); | |
1457 | ds->ds_prev->ds_phys->ds_unique_bytes = 0; | |
1458 | } | |
1459 | } else { | |
b128c09f BB |
1460 | objset_impl_t *osi; |
1461 | ||
45d1cae3 | 1462 | ASSERT(*ost != DMU_OST_ZVOL); |
b128c09f BB |
1463 | ASSERT3U(ds->ds_phys->ds_used_bytes, ==, 0); |
1464 | ASSERT3U(ds->ds_phys->ds_compressed_bytes, ==, 0); | |
1465 | ASSERT3U(ds->ds_phys->ds_uncompressed_bytes, ==, 0); | |
1466 | ||
34dc7c2f | 1467 | bzero(&ds->ds_phys->ds_bp, sizeof (blkptr_t)); |
34dc7c2f BB |
1468 | ds->ds_phys->ds_flags = 0; |
1469 | ds->ds_phys->ds_unique_bytes = 0; | |
b128c09f BB |
1470 | if (spa_version(ds->ds_dir->dd_pool->dp_spa) >= |
1471 | SPA_VERSION_UNIQUE_ACCURATE) | |
1472 | ds->ds_phys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; | |
1473 | ||
1474 | osi = dmu_objset_create_impl(ds->ds_dir->dd_pool->dp_spa, ds, | |
34dc7c2f | 1475 | &ds->ds_phys->ds_bp, *ost, tx); |
b128c09f BB |
1476 | #ifdef _KERNEL |
1477 | zfs_create_fs(&osi->os, kcred, NULL, tx); | |
1478 | #endif | |
34dc7c2f BB |
1479 | } |
1480 | ||
1481 | spa_history_internal_log(LOG_DS_ROLLBACK, ds->ds_dir->dd_pool->dp_spa, | |
1482 | tx, cr, "dataset = %llu", ds->ds_object); | |
1483 | } | |
1484 | ||
1485 | /* ARGSUSED */ | |
1486 | static int | |
1487 | dsl_dataset_destroy_begin_check(void *arg1, void *arg2, dmu_tx_t *tx) | |
1488 | { | |
1489 | dsl_dataset_t *ds = arg1; | |
1490 | objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; | |
1491 | uint64_t count; | |
1492 | int err; | |
1493 | ||
1494 | /* | |
1495 | * Can't delete a head dataset if there are snapshots of it. | |
1496 | * (Except if the only snapshots are from the branch we cloned | |
1497 | * from.) | |
1498 | */ | |
1499 | if (ds->ds_prev != NULL && | |
1500 | ds->ds_prev->ds_phys->ds_next_snap_obj == ds->ds_object) | |
1501 | return (EINVAL); | |
1502 | ||
1503 | /* | |
1504 | * This is really a dsl_dir thing, but check it here so that | |
1505 | * we'll be less likely to leave this dataset inconsistent & | |
1506 | * nearly destroyed. | |
1507 | */ | |
1508 | err = zap_count(mos, ds->ds_dir->dd_phys->dd_child_dir_zapobj, &count); | |
1509 | if (err) | |
1510 | return (err); | |
1511 | if (count != 0) | |
1512 | return (EEXIST); | |
1513 | ||
1514 | return (0); | |
1515 | } | |
1516 | ||
1517 | /* ARGSUSED */ | |
1518 | static void | |
1519 | dsl_dataset_destroy_begin_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) | |
1520 | { | |
1521 | dsl_dataset_t *ds = arg1; | |
1522 | dsl_pool_t *dp = ds->ds_dir->dd_pool; | |
1523 | ||
1524 | /* Mark it as inconsistent on-disk, in case we crash */ | |
1525 | dmu_buf_will_dirty(ds->ds_dbuf, tx); | |
1526 | ds->ds_phys->ds_flags |= DS_FLAG_INCONSISTENT; | |
1527 | ||
1528 | spa_history_internal_log(LOG_DS_DESTROY_BEGIN, dp->dp_spa, tx, | |
1529 | cr, "dataset = %llu", ds->ds_object); | |
1530 | } | |
1531 | ||
45d1cae3 BB |
1532 | static int |
1533 | dsl_dataset_origin_check(struct dsl_ds_destroyarg *dsda, void *tag, | |
1534 | dmu_tx_t *tx) | |
1535 | { | |
1536 | dsl_dataset_t *ds = dsda->ds; | |
1537 | dsl_dataset_t *ds_prev = ds->ds_prev; | |
1538 | ||
1539 | if (dsl_dataset_might_destroy_origin(ds_prev)) { | |
1540 | struct dsl_ds_destroyarg ndsda = {0}; | |
1541 | ||
1542 | /* | |
1543 | * If we're not prepared to remove the origin, don't remove | |
1544 | * the clone either. | |
1545 | */ | |
1546 | if (dsda->rm_origin == NULL) { | |
1547 | dsda->need_prep = B_TRUE; | |
1548 | return (EBUSY); | |
1549 | } | |
1550 | ||
1551 | ndsda.ds = ds_prev; | |
1552 | ndsda.is_origin_rm = B_TRUE; | |
1553 | return (dsl_dataset_destroy_check(&ndsda, tag, tx)); | |
1554 | } | |
1555 | ||
1556 | /* | |
1557 | * If we're not going to remove the origin after all, | |
1558 | * undo the open context setup. | |
1559 | */ | |
1560 | if (dsda->rm_origin != NULL) { | |
1561 | dsl_dataset_disown(dsda->rm_origin, tag); | |
1562 | dsda->rm_origin = NULL; | |
1563 | } | |
1564 | ||
1565 | return (0); | |
1566 | } | |
1567 | ||
34dc7c2f BB |
1568 | /* ARGSUSED */ |
1569 | int | |
1570 | dsl_dataset_destroy_check(void *arg1, void *arg2, dmu_tx_t *tx) | |
1571 | { | |
45d1cae3 BB |
1572 | struct dsl_ds_destroyarg *dsda = arg1; |
1573 | dsl_dataset_t *ds = dsda->ds; | |
34dc7c2f | 1574 | |
b128c09f BB |
1575 | /* we have an owner hold, so noone else can destroy us */ |
1576 | ASSERT(!DSL_DATASET_IS_DESTROYED(ds)); | |
1577 | ||
45d1cae3 BB |
1578 | /* |
1579 | * Only allow deferred destroy on pools that support it. | |
1580 | * NOTE: deferred destroy is only supported on snapshots. | |
1581 | */ | |
1582 | if (dsda->defer) { | |
1583 | if (spa_version(ds->ds_dir->dd_pool->dp_spa) < | |
1584 | SPA_VERSION_USERREFS) | |
1585 | return (ENOTSUP); | |
1586 | ASSERT(dsl_dataset_is_snapshot(ds)); | |
1587 | return (0); | |
1588 | } | |
34dc7c2f BB |
1589 | |
1590 | /* | |
1591 | * Can't delete a head dataset if there are snapshots of it. | |
1592 | * (Except if the only snapshots are from the branch we cloned | |
1593 | * from.) | |
1594 | */ | |
1595 | if (ds->ds_prev != NULL && | |
1596 | ds->ds_prev->ds_phys->ds_next_snap_obj == ds->ds_object) | |
1597 | return (EINVAL); | |
1598 | ||
1599 | /* | |
1600 | * If we made changes this txg, traverse_dsl_dataset won't find | |
1601 | * them. Try again. | |
1602 | */ | |
1603 | if (ds->ds_phys->ds_bp.blk_birth >= tx->tx_txg) | |
1604 | return (EAGAIN); | |
1605 | ||
45d1cae3 BB |
1606 | if (dsl_dataset_is_snapshot(ds)) { |
1607 | /* | |
1608 | * If this snapshot has an elevated user reference count, | |
1609 | * we can't destroy it yet. | |
1610 | */ | |
1611 | if (ds->ds_userrefs > 0 && !dsda->releasing) | |
1612 | return (EBUSY); | |
1613 | ||
1614 | mutex_enter(&ds->ds_lock); | |
1615 | /* | |
1616 | * Can't delete a branch point. However, if we're destroying | |
1617 | * a clone and removing its origin due to it having a user | |
1618 | * hold count of 0 and having been marked for deferred destroy, | |
1619 | * it's OK for the origin to have a single clone. | |
1620 | */ | |
1621 | if (ds->ds_phys->ds_num_children > | |
1622 | (dsda->is_origin_rm ? 2 : 1)) { | |
1623 | mutex_exit(&ds->ds_lock); | |
1624 | return (EEXIST); | |
1625 | } | |
1626 | mutex_exit(&ds->ds_lock); | |
1627 | } else if (dsl_dir_is_clone(ds->ds_dir)) { | |
1628 | return (dsl_dataset_origin_check(dsda, arg2, tx)); | |
1629 | } | |
1630 | ||
34dc7c2f BB |
1631 | /* XXX we should do some i/o error checking... */ |
1632 | return (0); | |
1633 | } | |
1634 | ||
b128c09f BB |
1635 | struct refsarg { |
1636 | kmutex_t lock; | |
1637 | boolean_t gone; | |
1638 | kcondvar_t cv; | |
1639 | }; | |
1640 | ||
1641 | /* ARGSUSED */ | |
1642 | static void | |
1643 | dsl_dataset_refs_gone(dmu_buf_t *db, void *argv) | |
1644 | { | |
1645 | struct refsarg *arg = argv; | |
1646 | ||
1647 | mutex_enter(&arg->lock); | |
1648 | arg->gone = TRUE; | |
1649 | cv_signal(&arg->cv); | |
1650 | mutex_exit(&arg->lock); | |
1651 | } | |
1652 | ||
1653 | static void | |
1654 | dsl_dataset_drain_refs(dsl_dataset_t *ds, void *tag) | |
1655 | { | |
1656 | struct refsarg arg; | |
1657 | ||
1658 | mutex_init(&arg.lock, NULL, MUTEX_DEFAULT, NULL); | |
1659 | cv_init(&arg.cv, NULL, CV_DEFAULT, NULL); | |
1660 | arg.gone = FALSE; | |
1661 | (void) dmu_buf_update_user(ds->ds_dbuf, ds, &arg, &ds->ds_phys, | |
1662 | dsl_dataset_refs_gone); | |
1663 | dmu_buf_rele(ds->ds_dbuf, tag); | |
1664 | mutex_enter(&arg.lock); | |
1665 | while (!arg.gone) | |
1666 | cv_wait(&arg.cv, &arg.lock); | |
1667 | ASSERT(arg.gone); | |
1668 | mutex_exit(&arg.lock); | |
1669 | ds->ds_dbuf = NULL; | |
1670 | ds->ds_phys = NULL; | |
1671 | mutex_destroy(&arg.lock); | |
1672 | cv_destroy(&arg.cv); | |
1673 | } | |
1674 | ||
34dc7c2f BB |
1675 | void |
1676 | dsl_dataset_destroy_sync(void *arg1, void *tag, cred_t *cr, dmu_tx_t *tx) | |
1677 | { | |
45d1cae3 BB |
1678 | struct dsl_ds_destroyarg *dsda = arg1; |
1679 | dsl_dataset_t *ds = dsda->ds; | |
34dc7c2f BB |
1680 | zio_t *zio; |
1681 | int err; | |
1682 | int after_branch_point = FALSE; | |
1683 | dsl_pool_t *dp = ds->ds_dir->dd_pool; | |
1684 | objset_t *mos = dp->dp_meta_objset; | |
1685 | dsl_dataset_t *ds_prev = NULL; | |
1686 | uint64_t obj; | |
1687 | ||
b128c09f | 1688 | ASSERT(ds->ds_owner); |
45d1cae3 | 1689 | ASSERT(dsda->defer || ds->ds_phys->ds_num_children <= 1); |
34dc7c2f BB |
1690 | ASSERT(ds->ds_prev == NULL || |
1691 | ds->ds_prev->ds_phys->ds_next_snap_obj != ds->ds_object); | |
1692 | ASSERT3U(ds->ds_phys->ds_bp.blk_birth, <=, tx->tx_txg); | |
1693 | ||
45d1cae3 BB |
1694 | if (dsda->defer) { |
1695 | ASSERT(spa_version(dp->dp_spa) >= SPA_VERSION_USERREFS); | |
1696 | if (ds->ds_userrefs > 0 || ds->ds_phys->ds_num_children > 1) { | |
1697 | dmu_buf_will_dirty(ds->ds_dbuf, tx); | |
1698 | ds->ds_phys->ds_flags |= DS_FLAG_DEFER_DESTROY; | |
1699 | return; | |
1700 | } | |
1701 | } | |
1702 | ||
b128c09f BB |
1703 | /* signal any waiters that this dataset is going away */ |
1704 | mutex_enter(&ds->ds_lock); | |
1705 | ds->ds_owner = dsl_reaper; | |
1706 | cv_broadcast(&ds->ds_exclusive_cv); | |
1707 | mutex_exit(&ds->ds_lock); | |
1708 | ||
34dc7c2f BB |
1709 | /* Remove our reservation */ |
1710 | if (ds->ds_reserved != 0) { | |
1711 | uint64_t val = 0; | |
1712 | dsl_dataset_set_reservation_sync(ds, &val, cr, tx); | |
1713 | ASSERT3U(ds->ds_reserved, ==, 0); | |
1714 | } | |
1715 | ||
1716 | ASSERT(RW_WRITE_HELD(&dp->dp_config_rwlock)); | |
1717 | ||
b128c09f BB |
1718 | dsl_pool_ds_destroyed(ds, tx); |
1719 | ||
34dc7c2f BB |
1720 | obj = ds->ds_object; |
1721 | ||
1722 | if (ds->ds_phys->ds_prev_snap_obj != 0) { | |
1723 | if (ds->ds_prev) { | |
1724 | ds_prev = ds->ds_prev; | |
1725 | } else { | |
b128c09f BB |
1726 | VERIFY(0 == dsl_dataset_hold_obj(dp, |
1727 | ds->ds_phys->ds_prev_snap_obj, FTAG, &ds_prev)); | |
34dc7c2f BB |
1728 | } |
1729 | after_branch_point = | |
1730 | (ds_prev->ds_phys->ds_next_snap_obj != obj); | |
1731 | ||
1732 | dmu_buf_will_dirty(ds_prev->ds_dbuf, tx); | |
b128c09f BB |
1733 | if (after_branch_point && |
1734 | ds_prev->ds_phys->ds_next_clones_obj != 0) { | |
9babb374 | 1735 | VERIFY3U(0, ==, zap_remove_int(mos, |
b128c09f BB |
1736 | ds_prev->ds_phys->ds_next_clones_obj, obj, tx)); |
1737 | if (ds->ds_phys->ds_next_snap_obj != 0) { | |
1738 | VERIFY(0 == zap_add_int(mos, | |
1739 | ds_prev->ds_phys->ds_next_clones_obj, | |
1740 | ds->ds_phys->ds_next_snap_obj, tx)); | |
1741 | } | |
1742 | } | |
34dc7c2f BB |
1743 | if (after_branch_point && |
1744 | ds->ds_phys->ds_next_snap_obj == 0) { | |
1745 | /* This clone is toast. */ | |
1746 | ASSERT(ds_prev->ds_phys->ds_num_children > 1); | |
1747 | ds_prev->ds_phys->ds_num_children--; | |
45d1cae3 BB |
1748 | |
1749 | /* | |
1750 | * If the clone's origin has no other clones, no | |
1751 | * user holds, and has been marked for deferred | |
1752 | * deletion, then we should have done the necessary | |
1753 | * destroy setup for it. | |
1754 | */ | |
1755 | if (ds_prev->ds_phys->ds_num_children == 1 && | |
1756 | ds_prev->ds_userrefs == 0 && | |
1757 | DS_IS_DEFER_DESTROY(ds_prev)) { | |
1758 | ASSERT3P(dsda->rm_origin, !=, NULL); | |
1759 | } else { | |
1760 | ASSERT3P(dsda->rm_origin, ==, NULL); | |
1761 | } | |
34dc7c2f BB |
1762 | } else if (!after_branch_point) { |
1763 | ds_prev->ds_phys->ds_next_snap_obj = | |
1764 | ds->ds_phys->ds_next_snap_obj; | |
1765 | } | |
1766 | } | |
1767 | ||
1768 | zio = zio_root(dp->dp_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED); | |
1769 | ||
1770 | if (ds->ds_phys->ds_next_snap_obj != 0) { | |
1771 | blkptr_t bp; | |
1772 | dsl_dataset_t *ds_next; | |
1773 | uint64_t itor = 0; | |
1774 | uint64_t old_unique; | |
b128c09f | 1775 | int64_t used = 0, compressed = 0, uncompressed = 0; |
34dc7c2f | 1776 | |
b128c09f BB |
1777 | VERIFY(0 == dsl_dataset_hold_obj(dp, |
1778 | ds->ds_phys->ds_next_snap_obj, FTAG, &ds_next)); | |
34dc7c2f BB |
1779 | ASSERT3U(ds_next->ds_phys->ds_prev_snap_obj, ==, obj); |
1780 | ||
1781 | old_unique = dsl_dataset_unique(ds_next); | |
1782 | ||
1783 | dmu_buf_will_dirty(ds_next->ds_dbuf, tx); | |
1784 | ds_next->ds_phys->ds_prev_snap_obj = | |
1785 | ds->ds_phys->ds_prev_snap_obj; | |
1786 | ds_next->ds_phys->ds_prev_snap_txg = | |
1787 | ds->ds_phys->ds_prev_snap_txg; | |
1788 | ASSERT3U(ds->ds_phys->ds_prev_snap_txg, ==, | |
1789 | ds_prev ? ds_prev->ds_phys->ds_creation_txg : 0); | |
1790 | ||
1791 | /* | |
1792 | * Transfer to our deadlist (which will become next's | |
1793 | * new deadlist) any entries from next's current | |
1794 | * deadlist which were born before prev, and free the | |
1795 | * other entries. | |
1796 | * | |
1797 | * XXX we're doing this long task with the config lock held | |
1798 | */ | |
b128c09f | 1799 | while (bplist_iterate(&ds_next->ds_deadlist, &itor, &bp) == 0) { |
34dc7c2f BB |
1800 | if (bp.blk_birth <= ds->ds_phys->ds_prev_snap_txg) { |
1801 | VERIFY(0 == bplist_enqueue(&ds->ds_deadlist, | |
1802 | &bp, tx)); | |
1803 | if (ds_prev && !after_branch_point && | |
1804 | bp.blk_birth > | |
1805 | ds_prev->ds_phys->ds_prev_snap_txg) { | |
1806 | ds_prev->ds_phys->ds_unique_bytes += | |
1807 | bp_get_dasize(dp->dp_spa, &bp); | |
1808 | } | |
1809 | } else { | |
1810 | used += bp_get_dasize(dp->dp_spa, &bp); | |
1811 | compressed += BP_GET_PSIZE(&bp); | |
1812 | uncompressed += BP_GET_UCSIZE(&bp); | |
1813 | /* XXX check return value? */ | |
b128c09f | 1814 | (void) dsl_free(zio, dp, tx->tx_txg, |
34dc7c2f BB |
1815 | &bp, NULL, NULL, ARC_NOWAIT); |
1816 | } | |
1817 | } | |
1818 | ||
b128c09f BB |
1819 | ASSERT3U(used, ==, ds->ds_phys->ds_unique_bytes); |
1820 | ||
1821 | /* change snapused */ | |
1822 | dsl_dir_diduse_space(ds->ds_dir, DD_USED_SNAP, | |
1823 | -used, -compressed, -uncompressed, tx); | |
1824 | ||
34dc7c2f BB |
1825 | /* free next's deadlist */ |
1826 | bplist_close(&ds_next->ds_deadlist); | |
1827 | bplist_destroy(mos, ds_next->ds_phys->ds_deadlist_obj, tx); | |
1828 | ||
1829 | /* set next's deadlist to our deadlist */ | |
b128c09f | 1830 | bplist_close(&ds->ds_deadlist); |
34dc7c2f BB |
1831 | ds_next->ds_phys->ds_deadlist_obj = |
1832 | ds->ds_phys->ds_deadlist_obj; | |
1833 | VERIFY(0 == bplist_open(&ds_next->ds_deadlist, mos, | |
1834 | ds_next->ds_phys->ds_deadlist_obj)); | |
1835 | ds->ds_phys->ds_deadlist_obj = 0; | |
1836 | ||
1837 | if (ds_next->ds_phys->ds_next_snap_obj != 0) { | |
1838 | /* | |
1839 | * Update next's unique to include blocks which | |
1840 | * were previously shared by only this snapshot | |
1841 | * and it. Those blocks will be born after the | |
1842 | * prev snap and before this snap, and will have | |
1843 | * died after the next snap and before the one | |
1844 | * after that (ie. be on the snap after next's | |
1845 | * deadlist). | |
1846 | * | |
1847 | * XXX we're doing this long task with the | |
1848 | * config lock held | |
1849 | */ | |
1850 | dsl_dataset_t *ds_after_next; | |
b128c09f | 1851 | uint64_t space; |
34dc7c2f | 1852 | |
b128c09f BB |
1853 | VERIFY(0 == dsl_dataset_hold_obj(dp, |
1854 | ds_next->ds_phys->ds_next_snap_obj, | |
1855 | FTAG, &ds_after_next)); | |
34dc7c2f | 1856 | |
b128c09f BB |
1857 | VERIFY(0 == |
1858 | bplist_space_birthrange(&ds_after_next->ds_deadlist, | |
1859 | ds->ds_phys->ds_prev_snap_txg, | |
1860 | ds->ds_phys->ds_creation_txg, &space)); | |
1861 | ds_next->ds_phys->ds_unique_bytes += space; | |
1862 | ||
1863 | dsl_dataset_rele(ds_after_next, FTAG); | |
34dc7c2f BB |
1864 | ASSERT3P(ds_next->ds_prev, ==, NULL); |
1865 | } else { | |
1866 | ASSERT3P(ds_next->ds_prev, ==, ds); | |
b128c09f BB |
1867 | dsl_dataset_drop_ref(ds_next->ds_prev, ds_next); |
1868 | ds_next->ds_prev = NULL; | |
34dc7c2f | 1869 | if (ds_prev) { |
b128c09f BB |
1870 | VERIFY(0 == dsl_dataset_get_ref(dp, |
1871 | ds->ds_phys->ds_prev_snap_obj, | |
1872 | ds_next, &ds_next->ds_prev)); | |
34dc7c2f BB |
1873 | } |
1874 | ||
1875 | dsl_dataset_recalc_head_uniq(ds_next); | |
1876 | ||
1877 | /* | |
1878 | * Reduce the amount of our unconsmed refreservation | |
1879 | * being charged to our parent by the amount of | |
1880 | * new unique data we have gained. | |
1881 | */ | |
1882 | if (old_unique < ds_next->ds_reserved) { | |
1883 | int64_t mrsdelta; | |
1884 | uint64_t new_unique = | |
1885 | ds_next->ds_phys->ds_unique_bytes; | |
1886 | ||
1887 | ASSERT(old_unique <= new_unique); | |
1888 | mrsdelta = MIN(new_unique - old_unique, | |
1889 | ds_next->ds_reserved - old_unique); | |
b128c09f BB |
1890 | dsl_dir_diduse_space(ds->ds_dir, |
1891 | DD_USED_REFRSRV, -mrsdelta, 0, 0, tx); | |
34dc7c2f BB |
1892 | } |
1893 | } | |
b128c09f | 1894 | dsl_dataset_rele(ds_next, FTAG); |
34dc7c2f BB |
1895 | } else { |
1896 | /* | |
1897 | * There's no next snapshot, so this is a head dataset. | |
1898 | * Destroy the deadlist. Unless it's a clone, the | |
1899 | * deadlist should be empty. (If it's a clone, it's | |
1900 | * safe to ignore the deadlist contents.) | |
1901 | */ | |
1902 | struct killarg ka; | |
1903 | ||
1904 | ASSERT(after_branch_point || bplist_empty(&ds->ds_deadlist)); | |
1905 | bplist_close(&ds->ds_deadlist); | |
1906 | bplist_destroy(mos, ds->ds_phys->ds_deadlist_obj, tx); | |
1907 | ds->ds_phys->ds_deadlist_obj = 0; | |
1908 | ||
1909 | /* | |
1910 | * Free everything that we point to (that's born after | |
1911 | * the previous snapshot, if we are a clone) | |
1912 | * | |
b128c09f BB |
1913 | * NB: this should be very quick, because we already |
1914 | * freed all the objects in open context. | |
34dc7c2f | 1915 | */ |
b128c09f | 1916 | ka.ds = ds; |
34dc7c2f BB |
1917 | ka.zio = zio; |
1918 | ka.tx = tx; | |
b128c09f BB |
1919 | err = traverse_dataset(ds, ds->ds_phys->ds_prev_snap_txg, |
1920 | TRAVERSE_POST, kill_blkptr, &ka); | |
34dc7c2f | 1921 | ASSERT3U(err, ==, 0); |
9babb374 | 1922 | ASSERT(!DS_UNIQUE_IS_ACCURATE(ds) || |
b128c09f | 1923 | ds->ds_phys->ds_unique_bytes == 0); |
34dc7c2f BB |
1924 | } |
1925 | ||
1926 | err = zio_wait(zio); | |
1927 | ASSERT3U(err, ==, 0); | |
1928 | ||
34dc7c2f | 1929 | if (ds->ds_dir->dd_phys->dd_head_dataset_obj == ds->ds_object) { |
b128c09f | 1930 | /* Erase the link in the dir */ |
34dc7c2f BB |
1931 | dmu_buf_will_dirty(ds->ds_dir->dd_dbuf, tx); |
1932 | ds->ds_dir->dd_phys->dd_head_dataset_obj = 0; | |
b128c09f BB |
1933 | ASSERT(ds->ds_phys->ds_snapnames_zapobj != 0); |
1934 | err = zap_destroy(mos, ds->ds_phys->ds_snapnames_zapobj, tx); | |
1935 | ASSERT(err == 0); | |
34dc7c2f BB |
1936 | } else { |
1937 | /* remove from snapshot namespace */ | |
1938 | dsl_dataset_t *ds_head; | |
b128c09f BB |
1939 | ASSERT(ds->ds_phys->ds_snapnames_zapobj == 0); |
1940 | VERIFY(0 == dsl_dataset_hold_obj(dp, | |
1941 | ds->ds_dir->dd_phys->dd_head_dataset_obj, FTAG, &ds_head)); | |
34dc7c2f BB |
1942 | VERIFY(0 == dsl_dataset_get_snapname(ds)); |
1943 | #ifdef ZFS_DEBUG | |
1944 | { | |
1945 | uint64_t val; | |
1946 | ||
b128c09f | 1947 | err = dsl_dataset_snap_lookup(ds_head, |
34dc7c2f BB |
1948 | ds->ds_snapname, &val); |
1949 | ASSERT3U(err, ==, 0); | |
1950 | ASSERT3U(val, ==, obj); | |
1951 | } | |
1952 | #endif | |
b128c09f | 1953 | err = dsl_dataset_snap_remove(ds_head, ds->ds_snapname, tx); |
34dc7c2f | 1954 | ASSERT(err == 0); |
b128c09f | 1955 | dsl_dataset_rele(ds_head, FTAG); |
34dc7c2f BB |
1956 | } |
1957 | ||
1958 | if (ds_prev && ds->ds_prev != ds_prev) | |
b128c09f | 1959 | dsl_dataset_rele(ds_prev, FTAG); |
34dc7c2f BB |
1960 | |
1961 | spa_prop_clear_bootfs(dp->dp_spa, ds->ds_object, tx); | |
1962 | spa_history_internal_log(LOG_DS_DESTROY, dp->dp_spa, tx, | |
1963 | cr, "dataset = %llu", ds->ds_object); | |
1964 | ||
b128c09f BB |
1965 | if (ds->ds_phys->ds_next_clones_obj != 0) { |
1966 | uint64_t count; | |
1967 | ASSERT(0 == zap_count(mos, | |
1968 | ds->ds_phys->ds_next_clones_obj, &count) && count == 0); | |
1969 | VERIFY(0 == dmu_object_free(mos, | |
1970 | ds->ds_phys->ds_next_clones_obj, tx)); | |
1971 | } | |
1972 | if (ds->ds_phys->ds_props_obj != 0) | |
1973 | VERIFY(0 == zap_destroy(mos, ds->ds_phys->ds_props_obj, tx)); | |
45d1cae3 BB |
1974 | if (ds->ds_phys->ds_userrefs_obj != 0) |
1975 | VERIFY(0 == zap_destroy(mos, ds->ds_phys->ds_userrefs_obj, tx)); | |
b128c09f BB |
1976 | dsl_dir_close(ds->ds_dir, ds); |
1977 | ds->ds_dir = NULL; | |
1978 | dsl_dataset_drain_refs(ds, tag); | |
34dc7c2f | 1979 | VERIFY(0 == dmu_object_free(mos, obj, tx)); |
45d1cae3 BB |
1980 | |
1981 | if (dsda->rm_origin) { | |
1982 | /* | |
1983 | * Remove the origin of the clone we just destroyed. | |
1984 | */ | |
1985 | dsl_dataset_t *origin = ds->ds_prev; | |
1986 | struct dsl_ds_destroyarg ndsda = {0}; | |
1987 | ||
1988 | ASSERT3P(origin, ==, dsda->rm_origin); | |
1989 | if (origin->ds_user_ptr) { | |
1990 | origin->ds_user_evict_func(origin, origin->ds_user_ptr); | |
1991 | origin->ds_user_ptr = NULL; | |
1992 | } | |
1993 | ||
1994 | dsl_dataset_rele(origin, tag); | |
1995 | ds->ds_prev = NULL; | |
1996 | ||
1997 | ndsda.ds = origin; | |
1998 | dsl_dataset_destroy_sync(&ndsda, tag, cr, tx); | |
1999 | } | |
34dc7c2f BB |
2000 | } |
2001 | ||
2002 | static int | |
2003 | dsl_dataset_snapshot_reserve_space(dsl_dataset_t *ds, dmu_tx_t *tx) | |
2004 | { | |
2005 | uint64_t asize; | |
2006 | ||
2007 | if (!dmu_tx_is_syncing(tx)) | |
2008 | return (0); | |
2009 | ||
2010 | /* | |
2011 | * If there's an fs-only reservation, any blocks that might become | |
2012 | * owned by the snapshot dataset must be accommodated by space | |
2013 | * outside of the reservation. | |
2014 | */ | |
2015 | asize = MIN(dsl_dataset_unique(ds), ds->ds_reserved); | |
2016 | if (asize > dsl_dir_space_available(ds->ds_dir, NULL, 0, FALSE)) | |
2017 | return (ENOSPC); | |
2018 | ||
2019 | /* | |
2020 | * Propogate any reserved space for this snapshot to other | |
2021 | * snapshot checks in this sync group. | |
2022 | */ | |
2023 | if (asize > 0) | |
2024 | dsl_dir_willuse_space(ds->ds_dir, asize, tx); | |
2025 | ||
2026 | return (0); | |
2027 | } | |
2028 | ||
2029 | /* ARGSUSED */ | |
2030 | int | |
2031 | dsl_dataset_snapshot_check(void *arg1, void *arg2, dmu_tx_t *tx) | |
2032 | { | |
2033 | dsl_dataset_t *ds = arg1; | |
2034 | const char *snapname = arg2; | |
34dc7c2f BB |
2035 | int err; |
2036 | uint64_t value; | |
2037 | ||
2038 | /* | |
2039 | * We don't allow multiple snapshots of the same txg. If there | |
2040 | * is already one, try again. | |
2041 | */ | |
2042 | if (ds->ds_phys->ds_prev_snap_txg >= tx->tx_txg) | |
2043 | return (EAGAIN); | |
2044 | ||
2045 | /* | |
2046 | * Check for conflicting name snapshot name. | |
2047 | */ | |
b128c09f | 2048 | err = dsl_dataset_snap_lookup(ds, snapname, &value); |
34dc7c2f BB |
2049 | if (err == 0) |
2050 | return (EEXIST); | |
2051 | if (err != ENOENT) | |
2052 | return (err); | |
2053 | ||
2054 | /* | |
2055 | * Check that the dataset's name is not too long. Name consists | |
2056 | * of the dataset's length + 1 for the @-sign + snapshot name's length | |
2057 | */ | |
2058 | if (dsl_dataset_namelen(ds) + 1 + strlen(snapname) >= MAXNAMELEN) | |
2059 | return (ENAMETOOLONG); | |
2060 | ||
2061 | err = dsl_dataset_snapshot_reserve_space(ds, tx); | |
2062 | if (err) | |
2063 | return (err); | |
2064 | ||
2065 | ds->ds_trysnap_txg = tx->tx_txg; | |
2066 | return (0); | |
2067 | } | |
2068 | ||
2069 | void | |
2070 | dsl_dataset_snapshot_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) | |
2071 | { | |
2072 | dsl_dataset_t *ds = arg1; | |
2073 | const char *snapname = arg2; | |
2074 | dsl_pool_t *dp = ds->ds_dir->dd_pool; | |
2075 | dmu_buf_t *dbuf; | |
2076 | dsl_dataset_phys_t *dsphys; | |
b128c09f | 2077 | uint64_t dsobj, crtxg; |
34dc7c2f BB |
2078 | objset_t *mos = dp->dp_meta_objset; |
2079 | int err; | |
2080 | ||
34dc7c2f BB |
2081 | ASSERT(RW_WRITE_HELD(&dp->dp_config_rwlock)); |
2082 | ||
b128c09f BB |
2083 | /* |
2084 | * The origin's ds_creation_txg has to be < TXG_INITIAL | |
2085 | */ | |
2086 | if (strcmp(snapname, ORIGIN_DIR_NAME) == 0) | |
2087 | crtxg = 1; | |
2088 | else | |
2089 | crtxg = tx->tx_txg; | |
2090 | ||
34dc7c2f BB |
2091 | dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, |
2092 | DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); | |
2093 | VERIFY(0 == dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); | |
2094 | dmu_buf_will_dirty(dbuf, tx); | |
2095 | dsphys = dbuf->db_data; | |
b128c09f | 2096 | bzero(dsphys, sizeof (dsl_dataset_phys_t)); |
34dc7c2f BB |
2097 | dsphys->ds_dir_obj = ds->ds_dir->dd_object; |
2098 | dsphys->ds_fsid_guid = unique_create(); | |
2099 | (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, | |
2100 | sizeof (dsphys->ds_guid)); | |
2101 | dsphys->ds_prev_snap_obj = ds->ds_phys->ds_prev_snap_obj; | |
2102 | dsphys->ds_prev_snap_txg = ds->ds_phys->ds_prev_snap_txg; | |
2103 | dsphys->ds_next_snap_obj = ds->ds_object; | |
2104 | dsphys->ds_num_children = 1; | |
2105 | dsphys->ds_creation_time = gethrestime_sec(); | |
b128c09f | 2106 | dsphys->ds_creation_txg = crtxg; |
34dc7c2f BB |
2107 | dsphys->ds_deadlist_obj = ds->ds_phys->ds_deadlist_obj; |
2108 | dsphys->ds_used_bytes = ds->ds_phys->ds_used_bytes; | |
2109 | dsphys->ds_compressed_bytes = ds->ds_phys->ds_compressed_bytes; | |
2110 | dsphys->ds_uncompressed_bytes = ds->ds_phys->ds_uncompressed_bytes; | |
2111 | dsphys->ds_flags = ds->ds_phys->ds_flags; | |
2112 | dsphys->ds_bp = ds->ds_phys->ds_bp; | |
2113 | dmu_buf_rele(dbuf, FTAG); | |
2114 | ||
2115 | ASSERT3U(ds->ds_prev != 0, ==, ds->ds_phys->ds_prev_snap_obj != 0); | |
2116 | if (ds->ds_prev) { | |
b128c09f BB |
2117 | uint64_t next_clones_obj = |
2118 | ds->ds_prev->ds_phys->ds_next_clones_obj; | |
34dc7c2f BB |
2119 | ASSERT(ds->ds_prev->ds_phys->ds_next_snap_obj == |
2120 | ds->ds_object || | |
2121 | ds->ds_prev->ds_phys->ds_num_children > 1); | |
2122 | if (ds->ds_prev->ds_phys->ds_next_snap_obj == ds->ds_object) { | |
2123 | dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); | |
2124 | ASSERT3U(ds->ds_phys->ds_prev_snap_txg, ==, | |
2125 | ds->ds_prev->ds_phys->ds_creation_txg); | |
2126 | ds->ds_prev->ds_phys->ds_next_snap_obj = dsobj; | |
b128c09f BB |
2127 | } else if (next_clones_obj != 0) { |
2128 | VERIFY3U(0, ==, zap_remove_int(mos, | |
2129 | next_clones_obj, dsphys->ds_next_snap_obj, tx)); | |
2130 | VERIFY3U(0, ==, zap_add_int(mos, | |
2131 | next_clones_obj, dsobj, tx)); | |
34dc7c2f BB |
2132 | } |
2133 | } | |
2134 | ||
2135 | /* | |
2136 | * If we have a reference-reservation on this dataset, we will | |
2137 | * need to increase the amount of refreservation being charged | |
2138 | * since our unique space is going to zero. | |
2139 | */ | |
2140 | if (ds->ds_reserved) { | |
2141 | int64_t add = MIN(dsl_dataset_unique(ds), ds->ds_reserved); | |
b128c09f BB |
2142 | dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, |
2143 | add, 0, 0, tx); | |
34dc7c2f BB |
2144 | } |
2145 | ||
2146 | bplist_close(&ds->ds_deadlist); | |
2147 | dmu_buf_will_dirty(ds->ds_dbuf, tx); | |
2148 | ASSERT3U(ds->ds_phys->ds_prev_snap_txg, <, tx->tx_txg); | |
2149 | ds->ds_phys->ds_prev_snap_obj = dsobj; | |
b128c09f | 2150 | ds->ds_phys->ds_prev_snap_txg = crtxg; |
34dc7c2f BB |
2151 | ds->ds_phys->ds_unique_bytes = 0; |
2152 | if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE) | |
2153 | ds->ds_phys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; | |
2154 | ds->ds_phys->ds_deadlist_obj = | |
2155 | bplist_create(mos, DSL_DEADLIST_BLOCKSIZE, tx); | |
2156 | VERIFY(0 == bplist_open(&ds->ds_deadlist, mos, | |
2157 | ds->ds_phys->ds_deadlist_obj)); | |
2158 | ||
2159 | dprintf("snap '%s' -> obj %llu\n", snapname, dsobj); | |
2160 | err = zap_add(mos, ds->ds_phys->ds_snapnames_zapobj, | |
2161 | snapname, 8, 1, &dsobj, tx); | |
2162 | ASSERT(err == 0); | |
2163 | ||
2164 | if (ds->ds_prev) | |
b128c09f BB |
2165 | dsl_dataset_drop_ref(ds->ds_prev, ds); |
2166 | VERIFY(0 == dsl_dataset_get_ref(dp, | |
2167 | ds->ds_phys->ds_prev_snap_obj, ds, &ds->ds_prev)); | |
2168 | ||
2169 | dsl_pool_ds_snapshotted(ds, tx); | |
34dc7c2f BB |
2170 | |
2171 | spa_history_internal_log(LOG_DS_SNAPSHOT, dp->dp_spa, tx, cr, | |
2172 | "dataset = %llu", dsobj); | |
2173 | } | |
2174 | ||
2175 | void | |
2176 | dsl_dataset_sync(dsl_dataset_t *ds, zio_t *zio, dmu_tx_t *tx) | |
2177 | { | |
2178 | ASSERT(dmu_tx_is_syncing(tx)); | |
2179 | ASSERT(ds->ds_user_ptr != NULL); | |
2180 | ASSERT(ds->ds_phys->ds_next_snap_obj == 0); | |
2181 | ||
2182 | /* | |
2183 | * in case we had to change ds_fsid_guid when we opened it, | |
2184 | * sync it out now. | |
2185 | */ | |
2186 | dmu_buf_will_dirty(ds->ds_dbuf, tx); | |
2187 | ds->ds_phys->ds_fsid_guid = ds->ds_fsid_guid; | |
2188 | ||
2189 | dsl_dir_dirty(ds->ds_dir, tx); | |
2190 | dmu_objset_sync(ds->ds_user_ptr, zio, tx); | |
2191 | } | |
2192 | ||
2193 | void | |
2194 | dsl_dataset_stats(dsl_dataset_t *ds, nvlist_t *nv) | |
2195 | { | |
2196 | uint64_t refd, avail, uobjs, aobjs; | |
2197 | ||
2198 | dsl_dir_stats(ds->ds_dir, nv); | |
2199 | ||
2200 | dsl_dataset_space(ds, &refd, &avail, &uobjs, &aobjs); | |
2201 | dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_AVAILABLE, avail); | |
2202 | dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFERENCED, refd); | |
2203 | ||
2204 | dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATION, | |
2205 | ds->ds_phys->ds_creation_time); | |
2206 | dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATETXG, | |
2207 | ds->ds_phys->ds_creation_txg); | |
2208 | dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFQUOTA, | |
2209 | ds->ds_quota); | |
2210 | dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRESERVATION, | |
2211 | ds->ds_reserved); | |
b128c09f BB |
2212 | dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_GUID, |
2213 | ds->ds_phys->ds_guid); | |
45d1cae3 BB |
2214 | dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USERREFS, ds->ds_userrefs); |
2215 | dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_DEFER_DESTROY, | |
2216 | DS_IS_DEFER_DESTROY(ds) ? 1 : 0); | |
34dc7c2f BB |
2217 | |
2218 | if (ds->ds_phys->ds_next_snap_obj) { | |
2219 | /* | |
2220 | * This is a snapshot; override the dd's space used with | |
2221 | * our unique space and compression ratio. | |
2222 | */ | |
2223 | dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USED, | |
2224 | ds->ds_phys->ds_unique_bytes); | |
2225 | dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_COMPRESSRATIO, | |
2226 | ds->ds_phys->ds_compressed_bytes == 0 ? 100 : | |
2227 | (ds->ds_phys->ds_uncompressed_bytes * 100 / | |
2228 | ds->ds_phys->ds_compressed_bytes)); | |
2229 | } | |
2230 | } | |
2231 | ||
2232 | void | |
2233 | dsl_dataset_fast_stat(dsl_dataset_t *ds, dmu_objset_stats_t *stat) | |
2234 | { | |
2235 | stat->dds_creation_txg = ds->ds_phys->ds_creation_txg; | |
2236 | stat->dds_inconsistent = ds->ds_phys->ds_flags & DS_FLAG_INCONSISTENT; | |
2237 | stat->dds_guid = ds->ds_phys->ds_guid; | |
2238 | if (ds->ds_phys->ds_next_snap_obj) { | |
2239 | stat->dds_is_snapshot = B_TRUE; | |
2240 | stat->dds_num_clones = ds->ds_phys->ds_num_children - 1; | |
fb5f0bc8 BB |
2241 | } else { |
2242 | stat->dds_is_snapshot = B_FALSE; | |
2243 | stat->dds_num_clones = 0; | |
34dc7c2f BB |
2244 | } |
2245 | ||
2246 | /* clone origin is really a dsl_dir thing... */ | |
2247 | rw_enter(&ds->ds_dir->dd_pool->dp_config_rwlock, RW_READER); | |
b128c09f | 2248 | if (dsl_dir_is_clone(ds->ds_dir)) { |
34dc7c2f BB |
2249 | dsl_dataset_t *ods; |
2250 | ||
b128c09f BB |
2251 | VERIFY(0 == dsl_dataset_get_ref(ds->ds_dir->dd_pool, |
2252 | ds->ds_dir->dd_phys->dd_origin_obj, FTAG, &ods)); | |
34dc7c2f | 2253 | dsl_dataset_name(ods, stat->dds_origin); |
b128c09f | 2254 | dsl_dataset_drop_ref(ods, FTAG); |
fb5f0bc8 BB |
2255 | } else { |
2256 | stat->dds_origin[0] = '\0'; | |
34dc7c2f BB |
2257 | } |
2258 | rw_exit(&ds->ds_dir->dd_pool->dp_config_rwlock); | |
2259 | } | |
2260 | ||
2261 | uint64_t | |
2262 | dsl_dataset_fsid_guid(dsl_dataset_t *ds) | |
2263 | { | |
2264 | return (ds->ds_fsid_guid); | |
2265 | } | |
2266 | ||
2267 | void | |
2268 | dsl_dataset_space(dsl_dataset_t *ds, | |
2269 | uint64_t *refdbytesp, uint64_t *availbytesp, | |
2270 | uint64_t *usedobjsp, uint64_t *availobjsp) | |
2271 | { | |
2272 | *refdbytesp = ds->ds_phys->ds_used_bytes; | |
2273 | *availbytesp = dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE); | |
2274 | if (ds->ds_reserved > ds->ds_phys->ds_unique_bytes) | |
2275 | *availbytesp += ds->ds_reserved - ds->ds_phys->ds_unique_bytes; | |
2276 | if (ds->ds_quota != 0) { | |
2277 | /* | |
2278 | * Adjust available bytes according to refquota | |
2279 | */ | |
2280 | if (*refdbytesp < ds->ds_quota) | |
2281 | *availbytesp = MIN(*availbytesp, | |
2282 | ds->ds_quota - *refdbytesp); | |
2283 | else | |
2284 | *availbytesp = 0; | |
2285 | } | |
2286 | *usedobjsp = ds->ds_phys->ds_bp.blk_fill; | |
2287 | *availobjsp = DN_MAX_OBJECT - *usedobjsp; | |
2288 | } | |
2289 | ||
2290 | boolean_t | |
2291 | dsl_dataset_modified_since_lastsnap(dsl_dataset_t *ds) | |
2292 | { | |
2293 | dsl_pool_t *dp = ds->ds_dir->dd_pool; | |
2294 | ||
2295 | ASSERT(RW_LOCK_HELD(&dp->dp_config_rwlock) || | |
2296 | dsl_pool_sync_context(dp)); | |
2297 | if (ds->ds_prev == NULL) | |
2298 | return (B_FALSE); | |
2299 | if (ds->ds_phys->ds_bp.blk_birth > | |
2300 | ds->ds_prev->ds_phys->ds_creation_txg) | |
2301 | return (B_TRUE); | |
2302 | return (B_FALSE); | |
2303 | } | |
2304 | ||
2305 | /* ARGSUSED */ | |
2306 | static int | |
2307 | dsl_dataset_snapshot_rename_check(void *arg1, void *arg2, dmu_tx_t *tx) | |
2308 | { | |
2309 | dsl_dataset_t *ds = arg1; | |
2310 | char *newsnapname = arg2; | |
2311 | dsl_dir_t *dd = ds->ds_dir; | |
34dc7c2f BB |
2312 | dsl_dataset_t *hds; |
2313 | uint64_t val; | |
2314 | int err; | |
2315 | ||
b128c09f BB |
2316 | err = dsl_dataset_hold_obj(dd->dd_pool, |
2317 | dd->dd_phys->dd_head_dataset_obj, FTAG, &hds); | |
34dc7c2f BB |
2318 | if (err) |
2319 | return (err); | |
2320 | ||
2321 | /* new name better not be in use */ | |
b128c09f BB |
2322 | err = dsl_dataset_snap_lookup(hds, newsnapname, &val); |
2323 | dsl_dataset_rele(hds, FTAG); | |
34dc7c2f BB |
2324 | |
2325 | if (err == 0) | |
2326 | err = EEXIST; | |
2327 | else if (err == ENOENT) | |
2328 | err = 0; | |
2329 | ||
2330 | /* dataset name + 1 for the "@" + the new snapshot name must fit */ | |
2331 | if (dsl_dir_namelen(ds->ds_dir) + 1 + strlen(newsnapname) >= MAXNAMELEN) | |
2332 | err = ENAMETOOLONG; | |
2333 | ||
2334 | return (err); | |
2335 | } | |
2336 | ||
2337 | static void | |
2338 | dsl_dataset_snapshot_rename_sync(void *arg1, void *arg2, | |
2339 | cred_t *cr, dmu_tx_t *tx) | |
2340 | { | |
2341 | dsl_dataset_t *ds = arg1; | |
2342 | const char *newsnapname = arg2; | |
2343 | dsl_dir_t *dd = ds->ds_dir; | |
2344 | objset_t *mos = dd->dd_pool->dp_meta_objset; | |
2345 | dsl_dataset_t *hds; | |
2346 | int err; | |
2347 | ||
2348 | ASSERT(ds->ds_phys->ds_next_snap_obj != 0); | |
2349 | ||
b128c09f BB |
2350 | VERIFY(0 == dsl_dataset_hold_obj(dd->dd_pool, |
2351 | dd->dd_phys->dd_head_dataset_obj, FTAG, &hds)); | |
34dc7c2f BB |
2352 | |
2353 | VERIFY(0 == dsl_dataset_get_snapname(ds)); | |
b128c09f | 2354 | err = dsl_dataset_snap_remove(hds, ds->ds_snapname, tx); |
34dc7c2f BB |
2355 | ASSERT3U(err, ==, 0); |
2356 | mutex_enter(&ds->ds_lock); | |
2357 | (void) strcpy(ds->ds_snapname, newsnapname); | |
2358 | mutex_exit(&ds->ds_lock); | |
2359 | err = zap_add(mos, hds->ds_phys->ds_snapnames_zapobj, | |
2360 | ds->ds_snapname, 8, 1, &ds->ds_object, tx); | |
2361 | ASSERT3U(err, ==, 0); | |
2362 | ||
2363 | spa_history_internal_log(LOG_DS_RENAME, dd->dd_pool->dp_spa, tx, | |
2364 | cr, "dataset = %llu", ds->ds_object); | |
b128c09f | 2365 | dsl_dataset_rele(hds, FTAG); |
34dc7c2f BB |
2366 | } |
2367 | ||
2368 | struct renamesnaparg { | |
2369 | dsl_sync_task_group_t *dstg; | |
2370 | char failed[MAXPATHLEN]; | |
2371 | char *oldsnap; | |
2372 | char *newsnap; | |
2373 | }; | |
2374 | ||
2375 | static int | |
2376 | dsl_snapshot_rename_one(char *name, void *arg) | |
2377 | { | |
2378 | struct renamesnaparg *ra = arg; | |
2379 | dsl_dataset_t *ds = NULL; | |
2380 | char *cp; | |
2381 | int err; | |
2382 | ||
2383 | cp = name + strlen(name); | |
2384 | *cp = '@'; | |
2385 | (void) strcpy(cp + 1, ra->oldsnap); | |
2386 | ||
2387 | /* | |
2388 | * For recursive snapshot renames the parent won't be changing | |
2389 | * so we just pass name for both the to/from argument. | |
2390 | */ | |
b128c09f | 2391 | err = zfs_secpolicy_rename_perms(name, name, CRED()); |
34dc7c2f | 2392 | if (err == ENOENT) { |
34dc7c2f | 2393 | return (0); |
b128c09f | 2394 | } else if (err) { |
34dc7c2f | 2395 | (void) strcpy(ra->failed, name); |
34dc7c2f BB |
2396 | return (err); |
2397 | } | |
2398 | ||
2399 | #ifdef _KERNEL | |
b128c09f BB |
2400 | /* |
2401 | * For all filesystems undergoing rename, we'll need to unmount it. | |
2402 | */ | |
34dc7c2f BB |
2403 | (void) zfs_unmount_snap(name, NULL); |
2404 | #endif | |
b128c09f | 2405 | err = dsl_dataset_hold(name, ra->dstg, &ds); |
34dc7c2f | 2406 | *cp = '\0'; |
b128c09f BB |
2407 | if (err == ENOENT) { |
2408 | return (0); | |
2409 | } else if (err) { | |
2410 | (void) strcpy(ra->failed, name); | |
2411 | return (err); | |
2412 | } | |
34dc7c2f BB |
2413 | |
2414 | dsl_sync_task_create(ra->dstg, dsl_dataset_snapshot_rename_check, | |
2415 | dsl_dataset_snapshot_rename_sync, ds, ra->newsnap, 0); | |
2416 | ||
2417 | return (0); | |
2418 | } | |
2419 | ||
2420 | static int | |
2421 | dsl_recursive_rename(char *oldname, const char *newname) | |
2422 | { | |
2423 | int err; | |
2424 | struct renamesnaparg *ra; | |
2425 | dsl_sync_task_t *dst; | |
2426 | spa_t *spa; | |
2427 | char *cp, *fsname = spa_strdup(oldname); | |
2428 | int len = strlen(oldname); | |
2429 | ||
2430 | /* truncate the snapshot name to get the fsname */ | |
2431 | cp = strchr(fsname, '@'); | |
2432 | *cp = '\0'; | |
2433 | ||
2434 | err = spa_open(fsname, &spa, FTAG); | |
2435 | if (err) { | |
2436 | kmem_free(fsname, len + 1); | |
2437 | return (err); | |
2438 | } | |
2439 | ra = kmem_alloc(sizeof (struct renamesnaparg), KM_SLEEP); | |
2440 | ra->dstg = dsl_sync_task_group_create(spa_get_dsl(spa)); | |
2441 | ||
2442 | ra->oldsnap = strchr(oldname, '@') + 1; | |
2443 | ra->newsnap = strchr(newname, '@') + 1; | |
2444 | *ra->failed = '\0'; | |
2445 | ||
2446 | err = dmu_objset_find(fsname, dsl_snapshot_rename_one, ra, | |
2447 | DS_FIND_CHILDREN); | |
2448 | kmem_free(fsname, len + 1); | |
2449 | ||
2450 | if (err == 0) { | |
2451 | err = dsl_sync_task_group_wait(ra->dstg); | |
2452 | } | |
2453 | ||
2454 | for (dst = list_head(&ra->dstg->dstg_tasks); dst; | |
2455 | dst = list_next(&ra->dstg->dstg_tasks, dst)) { | |
2456 | dsl_dataset_t *ds = dst->dst_arg1; | |
2457 | if (dst->dst_err) { | |
2458 | dsl_dir_name(ds->ds_dir, ra->failed); | |
2459 | (void) strcat(ra->failed, "@"); | |
2460 | (void) strcat(ra->failed, ra->newsnap); | |
2461 | } | |
b128c09f | 2462 | dsl_dataset_rele(ds, ra->dstg); |
34dc7c2f BB |
2463 | } |
2464 | ||
2465 | if (err) | |
2466 | (void) strcpy(oldname, ra->failed); | |
2467 | ||
2468 | dsl_sync_task_group_destroy(ra->dstg); | |
2469 | kmem_free(ra, sizeof (struct renamesnaparg)); | |
2470 | spa_close(spa, FTAG); | |
2471 | return (err); | |
2472 | } | |
2473 | ||
2474 | static int | |
2475 | dsl_valid_rename(char *oldname, void *arg) | |
2476 | { | |
2477 | int delta = *(int *)arg; | |
2478 | ||
2479 | if (strlen(oldname) + delta >= MAXNAMELEN) | |
2480 | return (ENAMETOOLONG); | |
2481 | ||
2482 | return (0); | |
2483 | } | |
2484 | ||
2485 | #pragma weak dmu_objset_rename = dsl_dataset_rename | |
2486 | int | |
b128c09f | 2487 | dsl_dataset_rename(char *oldname, const char *newname, boolean_t recursive) |
34dc7c2f BB |
2488 | { |
2489 | dsl_dir_t *dd; | |
2490 | dsl_dataset_t *ds; | |
2491 | const char *tail; | |
2492 | int err; | |
2493 | ||
2494 | err = dsl_dir_open(oldname, FTAG, &dd, &tail); | |
2495 | if (err) | |
2496 | return (err); | |
d164b209 BB |
2497 | /* |
2498 | * If there are more than 2 references there may be holds | |
2499 | * hanging around that haven't been cleared out yet. | |
2500 | */ | |
2501 | if (dmu_buf_refcount(dd->dd_dbuf) > 2) | |
2502 | txg_wait_synced(dd->dd_pool, 0); | |
34dc7c2f BB |
2503 | if (tail == NULL) { |
2504 | int delta = strlen(newname) - strlen(oldname); | |
2505 | ||
b128c09f | 2506 | /* if we're growing, validate child name lengths */ |
34dc7c2f BB |
2507 | if (delta > 0) |
2508 | err = dmu_objset_find(oldname, dsl_valid_rename, | |
2509 | &delta, DS_FIND_CHILDREN | DS_FIND_SNAPSHOTS); | |
2510 | ||
2511 | if (!err) | |
2512 | err = dsl_dir_rename(dd, newname); | |
2513 | dsl_dir_close(dd, FTAG); | |
2514 | return (err); | |
2515 | } | |
2516 | if (tail[0] != '@') { | |
2517 | /* the name ended in a nonexistant component */ | |
2518 | dsl_dir_close(dd, FTAG); | |
2519 | return (ENOENT); | |
2520 | } | |
2521 | ||
2522 | dsl_dir_close(dd, FTAG); | |
2523 | ||
2524 | /* new name must be snapshot in same filesystem */ | |
2525 | tail = strchr(newname, '@'); | |
2526 | if (tail == NULL) | |
2527 | return (EINVAL); | |
2528 | tail++; | |
2529 | if (strncmp(oldname, newname, tail - newname) != 0) | |
2530 | return (EXDEV); | |
2531 | ||
2532 | if (recursive) { | |
2533 | err = dsl_recursive_rename(oldname, newname); | |
2534 | } else { | |
b128c09f | 2535 | err = dsl_dataset_hold(oldname, FTAG, &ds); |
34dc7c2f BB |
2536 | if (err) |
2537 | return (err); | |
2538 | ||
2539 | err = dsl_sync_task_do(ds->ds_dir->dd_pool, | |
2540 | dsl_dataset_snapshot_rename_check, | |
2541 | dsl_dataset_snapshot_rename_sync, ds, (char *)tail, 1); | |
2542 | ||
b128c09f | 2543 | dsl_dataset_rele(ds, FTAG); |
34dc7c2f BB |
2544 | } |
2545 | ||
2546 | return (err); | |
2547 | } | |
2548 | ||
b128c09f BB |
2549 | struct promotenode { |
2550 | list_node_t link; | |
2551 | dsl_dataset_t *ds; | |
2552 | }; | |
2553 | ||
34dc7c2f | 2554 | struct promotearg { |
b128c09f BB |
2555 | list_t shared_snaps, origin_snaps, clone_snaps; |
2556 | dsl_dataset_t *origin_origin, *origin_head; | |
2557 | uint64_t used, comp, uncomp, unique, cloneusedsnap, originusedsnap; | |
34dc7c2f BB |
2558 | }; |
2559 | ||
b128c09f BB |
2560 | static int snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep); |
2561 | ||
34dc7c2f BB |
2562 | /* ARGSUSED */ |
2563 | static int | |
2564 | dsl_dataset_promote_check(void *arg1, void *arg2, dmu_tx_t *tx) | |
2565 | { | |
2566 | dsl_dataset_t *hds = arg1; | |
2567 | struct promotearg *pa = arg2; | |
b128c09f BB |
2568 | struct promotenode *snap = list_head(&pa->shared_snaps); |
2569 | dsl_dataset_t *origin_ds = snap->ds; | |
34dc7c2f | 2570 | int err; |
34dc7c2f | 2571 | |
b128c09f BB |
2572 | /* Check that it is a real clone */ |
2573 | if (!dsl_dir_is_clone(hds->ds_dir)) | |
34dc7c2f BB |
2574 | return (EINVAL); |
2575 | ||
2576 | /* Since this is so expensive, don't do the preliminary check */ | |
2577 | if (!dmu_tx_is_syncing(tx)) | |
2578 | return (0); | |
2579 | ||
b128c09f BB |
2580 | if (hds->ds_phys->ds_flags & DS_FLAG_NOPROMOTE) |
2581 | return (EXDEV); | |
34dc7c2f BB |
2582 | |
2583 | /* compute origin's new unique space */ | |
b128c09f BB |
2584 | snap = list_tail(&pa->clone_snaps); |
2585 | ASSERT3U(snap->ds->ds_phys->ds_prev_snap_obj, ==, origin_ds->ds_object); | |
2586 | err = bplist_space_birthrange(&snap->ds->ds_deadlist, | |
2587 | origin_ds->ds_phys->ds_prev_snap_txg, UINT64_MAX, &pa->unique); | |
2588 | if (err) | |
2589 | return (err); | |
34dc7c2f | 2590 | |
b128c09f BB |
2591 | /* |
2592 | * Walk the snapshots that we are moving | |
2593 | * | |
2594 | * Compute space to transfer. Consider the incremental changes | |
2595 | * to used for each snapshot: | |
2596 | * (my used) = (prev's used) + (blocks born) - (blocks killed) | |
2597 | * So each snapshot gave birth to: | |
2598 | * (blocks born) = (my used) - (prev's used) + (blocks killed) | |
2599 | * So a sequence would look like: | |
2600 | * (uN - u(N-1) + kN) + ... + (u1 - u0 + k1) + (u0 - 0 + k0) | |
2601 | * Which simplifies to: | |
2602 | * uN + kN + kN-1 + ... + k1 + k0 | |
2603 | * Note however, if we stop before we reach the ORIGIN we get: | |
2604 | * uN + kN + kN-1 + ... + kM - uM-1 | |
2605 | */ | |
2606 | pa->used = origin_ds->ds_phys->ds_used_bytes; | |
2607 | pa->comp = origin_ds->ds_phys->ds_compressed_bytes; | |
2608 | pa->uncomp = origin_ds->ds_phys->ds_uncompressed_bytes; | |
2609 | for (snap = list_head(&pa->shared_snaps); snap; | |
2610 | snap = list_next(&pa->shared_snaps, snap)) { | |
34dc7c2f | 2611 | uint64_t val, dlused, dlcomp, dluncomp; |
b128c09f | 2612 | dsl_dataset_t *ds = snap->ds; |
34dc7c2f BB |
2613 | |
2614 | /* Check that the snapshot name does not conflict */ | |
b128c09f BB |
2615 | VERIFY(0 == dsl_dataset_get_snapname(ds)); |
2616 | err = dsl_dataset_snap_lookup(hds, ds->ds_snapname, &val); | |
2617 | if (err == 0) | |
2618 | return (EEXIST); | |
2619 | if (err != ENOENT) | |
2620 | return (err); | |
34dc7c2f | 2621 | |
b128c09f | 2622 | /* The very first snapshot does not have a deadlist */ |
34dc7c2f | 2623 | if (ds->ds_phys->ds_prev_snap_obj == 0) |
b128c09f | 2624 | continue; |
34dc7c2f BB |
2625 | |
2626 | if (err = bplist_space(&ds->ds_deadlist, | |
2627 | &dlused, &dlcomp, &dluncomp)) | |
b128c09f BB |
2628 | return (err); |
2629 | pa->used += dlused; | |
2630 | pa->comp += dlcomp; | |
2631 | pa->uncomp += dluncomp; | |
2632 | } | |
34dc7c2f | 2633 | |
b128c09f BB |
2634 | /* |
2635 | * If we are a clone of a clone then we never reached ORIGIN, | |
2636 | * so we need to subtract out the clone origin's used space. | |
2637 | */ | |
2638 | if (pa->origin_origin) { | |
2639 | pa->used -= pa->origin_origin->ds_phys->ds_used_bytes; | |
2640 | pa->comp -= pa->origin_origin->ds_phys->ds_compressed_bytes; | |
2641 | pa->uncomp -= pa->origin_origin->ds_phys->ds_uncompressed_bytes; | |
34dc7c2f BB |
2642 | } |
2643 | ||
2644 | /* Check that there is enough space here */ | |
b128c09f BB |
2645 | err = dsl_dir_transfer_possible(origin_ds->ds_dir, hds->ds_dir, |
2646 | pa->used); | |
2647 | if (err) | |
2648 | return (err); | |
34dc7c2f | 2649 | |
b128c09f BB |
2650 | /* |
2651 | * Compute the amounts of space that will be used by snapshots | |
2652 | * after the promotion (for both origin and clone). For each, | |
2653 | * it is the amount of space that will be on all of their | |
2654 | * deadlists (that was not born before their new origin). | |
2655 | */ | |
2656 | if (hds->ds_dir->dd_phys->dd_flags & DD_FLAG_USED_BREAKDOWN) { | |
2657 | uint64_t space; | |
2658 | ||
2659 | /* | |
2660 | * Note, typically this will not be a clone of a clone, | |
2661 | * so snap->ds->ds_origin_txg will be < TXG_INITIAL, so | |
2662 | * these snaplist_space() -> bplist_space_birthrange() | |
2663 | * calls will be fast because they do not have to | |
2664 | * iterate over all bps. | |
2665 | */ | |
2666 | snap = list_head(&pa->origin_snaps); | |
2667 | err = snaplist_space(&pa->shared_snaps, | |
2668 | snap->ds->ds_origin_txg, &pa->cloneusedsnap); | |
2669 | if (err) | |
2670 | return (err); | |
2671 | ||
2672 | err = snaplist_space(&pa->clone_snaps, | |
2673 | snap->ds->ds_origin_txg, &space); | |
2674 | if (err) | |
2675 | return (err); | |
2676 | pa->cloneusedsnap += space; | |
2677 | } | |
2678 | if (origin_ds->ds_dir->dd_phys->dd_flags & DD_FLAG_USED_BREAKDOWN) { | |
2679 | err = snaplist_space(&pa->origin_snaps, | |
2680 | origin_ds->ds_phys->ds_creation_txg, &pa->originusedsnap); | |
2681 | if (err) | |
2682 | return (err); | |
2683 | } | |
2684 | ||
2685 | return (0); | |
34dc7c2f BB |
2686 | } |
2687 | ||
2688 | static void | |
2689 | dsl_dataset_promote_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) | |
2690 | { | |
2691 | dsl_dataset_t *hds = arg1; | |
2692 | struct promotearg *pa = arg2; | |
b128c09f BB |
2693 | struct promotenode *snap = list_head(&pa->shared_snaps); |
2694 | dsl_dataset_t *origin_ds = snap->ds; | |
2695 | dsl_dataset_t *origin_head; | |
34dc7c2f BB |
2696 | dsl_dir_t *dd = hds->ds_dir; |
2697 | dsl_pool_t *dp = hds->ds_dir->dd_pool; | |
2698 | dsl_dir_t *odd = NULL; | |
b128c09f BB |
2699 | uint64_t oldnext_obj; |
2700 | int64_t delta; | |
34dc7c2f | 2701 | |
34dc7c2f BB |
2702 | ASSERT(0 == (hds->ds_phys->ds_flags & DS_FLAG_NOPROMOTE)); |
2703 | ||
b128c09f BB |
2704 | snap = list_head(&pa->origin_snaps); |
2705 | origin_head = snap->ds; | |
2706 | ||
34dc7c2f BB |
2707 | /* |
2708 | * We need to explicitly open odd, since origin_ds's dd will be | |
2709 | * changing. | |
2710 | */ | |
2711 | VERIFY(0 == dsl_dir_open_obj(dp, origin_ds->ds_dir->dd_object, | |
2712 | NULL, FTAG, &odd)); | |
2713 | ||
b128c09f BB |
2714 | /* change origin's next snap */ |
2715 | dmu_buf_will_dirty(origin_ds->ds_dbuf, tx); | |
2716 | oldnext_obj = origin_ds->ds_phys->ds_next_snap_obj; | |
2717 | snap = list_tail(&pa->clone_snaps); | |
2718 | ASSERT3U(snap->ds->ds_phys->ds_prev_snap_obj, ==, origin_ds->ds_object); | |
2719 | origin_ds->ds_phys->ds_next_snap_obj = snap->ds->ds_object; | |
2720 | ||
2721 | /* change the origin's next clone */ | |
2722 | if (origin_ds->ds_phys->ds_next_clones_obj) { | |
2723 | VERIFY3U(0, ==, zap_remove_int(dp->dp_meta_objset, | |
2724 | origin_ds->ds_phys->ds_next_clones_obj, | |
2725 | origin_ds->ds_phys->ds_next_snap_obj, tx)); | |
2726 | VERIFY3U(0, ==, zap_add_int(dp->dp_meta_objset, | |
2727 | origin_ds->ds_phys->ds_next_clones_obj, | |
2728 | oldnext_obj, tx)); | |
2729 | } | |
2730 | ||
2731 | /* change origin */ | |
2732 | dmu_buf_will_dirty(dd->dd_dbuf, tx); | |
2733 | ASSERT3U(dd->dd_phys->dd_origin_obj, ==, origin_ds->ds_object); | |
2734 | dd->dd_phys->dd_origin_obj = odd->dd_phys->dd_origin_obj; | |
2735 | hds->ds_origin_txg = origin_head->ds_origin_txg; | |
2736 | dmu_buf_will_dirty(odd->dd_dbuf, tx); | |
2737 | odd->dd_phys->dd_origin_obj = origin_ds->ds_object; | |
2738 | origin_head->ds_origin_txg = origin_ds->ds_phys->ds_creation_txg; | |
34dc7c2f | 2739 | |
b128c09f BB |
2740 | /* move snapshots to this dir */ |
2741 | for (snap = list_head(&pa->shared_snaps); snap; | |
2742 | snap = list_next(&pa->shared_snaps, snap)) { | |
2743 | dsl_dataset_t *ds = snap->ds; | |
2744 | ||
2745 | /* unregister props as dsl_dir is changing */ | |
2746 | if (ds->ds_user_ptr) { | |
2747 | ds->ds_user_evict_func(ds, ds->ds_user_ptr); | |
2748 | ds->ds_user_ptr = NULL; | |
2749 | } | |
34dc7c2f | 2750 | /* move snap name entry */ |
b128c09f BB |
2751 | VERIFY(0 == dsl_dataset_get_snapname(ds)); |
2752 | VERIFY(0 == dsl_dataset_snap_remove(origin_head, | |
2753 | ds->ds_snapname, tx)); | |
34dc7c2f BB |
2754 | VERIFY(0 == zap_add(dp->dp_meta_objset, |
2755 | hds->ds_phys->ds_snapnames_zapobj, ds->ds_snapname, | |
2756 | 8, 1, &ds->ds_object, tx)); | |
34dc7c2f BB |
2757 | /* change containing dsl_dir */ |
2758 | dmu_buf_will_dirty(ds->ds_dbuf, tx); | |
2759 | ASSERT3U(ds->ds_phys->ds_dir_obj, ==, odd->dd_object); | |
2760 | ds->ds_phys->ds_dir_obj = dd->dd_object; | |
2761 | ASSERT3P(ds->ds_dir, ==, odd); | |
2762 | dsl_dir_close(ds->ds_dir, ds); | |
2763 | VERIFY(0 == dsl_dir_open_obj(dp, dd->dd_object, | |
2764 | NULL, ds, &ds->ds_dir)); | |
2765 | ||
2766 | ASSERT3U(dsl_prop_numcb(ds), ==, 0); | |
34dc7c2f | 2767 | } |
34dc7c2f | 2768 | |
b128c09f BB |
2769 | /* |
2770 | * Change space accounting. | |
2771 | * Note, pa->*usedsnap and dd_used_breakdown[SNAP] will either | |
2772 | * both be valid, or both be 0 (resulting in delta == 0). This | |
2773 | * is true for each of {clone,origin} independently. | |
2774 | */ | |
34dc7c2f | 2775 | |
b128c09f BB |
2776 | delta = pa->cloneusedsnap - |
2777 | dd->dd_phys->dd_used_breakdown[DD_USED_SNAP]; | |
2778 | ASSERT3S(delta, >=, 0); | |
2779 | ASSERT3U(pa->used, >=, delta); | |
2780 | dsl_dir_diduse_space(dd, DD_USED_SNAP, delta, 0, 0, tx); | |
2781 | dsl_dir_diduse_space(dd, DD_USED_HEAD, | |
2782 | pa->used - delta, pa->comp, pa->uncomp, tx); | |
2783 | ||
2784 | delta = pa->originusedsnap - | |
2785 | odd->dd_phys->dd_used_breakdown[DD_USED_SNAP]; | |
2786 | ASSERT3S(delta, <=, 0); | |
2787 | ASSERT3U(pa->used, >=, -delta); | |
2788 | dsl_dir_diduse_space(odd, DD_USED_SNAP, delta, 0, 0, tx); | |
2789 | dsl_dir_diduse_space(odd, DD_USED_HEAD, | |
2790 | -pa->used - delta, -pa->comp, -pa->uncomp, tx); | |
34dc7c2f | 2791 | |
34dc7c2f BB |
2792 | origin_ds->ds_phys->ds_unique_bytes = pa->unique; |
2793 | ||
2794 | /* log history record */ | |
2795 | spa_history_internal_log(LOG_DS_PROMOTE, dd->dd_pool->dp_spa, tx, | |
b128c09f | 2796 | cr, "dataset = %llu", hds->ds_object); |
34dc7c2f BB |
2797 | |
2798 | dsl_dir_close(odd, FTAG); | |
34dc7c2f BB |
2799 | } |
2800 | ||
b128c09f BB |
2801 | static char *snaplist_tag = "snaplist"; |
2802 | /* | |
2803 | * Make a list of dsl_dataset_t's for the snapshots between first_obj | |
2804 | * (exclusive) and last_obj (inclusive). The list will be in reverse | |
2805 | * order (last_obj will be the list_head()). If first_obj == 0, do all | |
2806 | * snapshots back to this dataset's origin. | |
2807 | */ | |
2808 | static int | |
2809 | snaplist_make(dsl_pool_t *dp, boolean_t own, | |
2810 | uint64_t first_obj, uint64_t last_obj, list_t *l) | |
2811 | { | |
2812 | uint64_t obj = last_obj; | |
2813 | ||
2814 | ASSERT(RW_LOCK_HELD(&dp->dp_config_rwlock)); | |
2815 | ||
2816 | list_create(l, sizeof (struct promotenode), | |
2817 | offsetof(struct promotenode, link)); | |
2818 | ||
2819 | while (obj != first_obj) { | |
2820 | dsl_dataset_t *ds; | |
2821 | struct promotenode *snap; | |
2822 | int err; | |
2823 | ||
2824 | if (own) { | |
2825 | err = dsl_dataset_own_obj(dp, obj, | |
2826 | 0, snaplist_tag, &ds); | |
2827 | if (err == 0) | |
2828 | dsl_dataset_make_exclusive(ds, snaplist_tag); | |
2829 | } else { | |
2830 | err = dsl_dataset_hold_obj(dp, obj, snaplist_tag, &ds); | |
2831 | } | |
2832 | if (err == ENOENT) { | |
2833 | /* lost race with snapshot destroy */ | |
2834 | struct promotenode *last = list_tail(l); | |
2835 | ASSERT(obj != last->ds->ds_phys->ds_prev_snap_obj); | |
2836 | obj = last->ds->ds_phys->ds_prev_snap_obj; | |
2837 | continue; | |
2838 | } else if (err) { | |
2839 | return (err); | |
2840 | } | |
2841 | ||
2842 | if (first_obj == 0) | |
2843 | first_obj = ds->ds_dir->dd_phys->dd_origin_obj; | |
2844 | ||
2845 | snap = kmem_alloc(sizeof (struct promotenode), KM_SLEEP); | |
2846 | snap->ds = ds; | |
2847 | list_insert_tail(l, snap); | |
2848 | obj = ds->ds_phys->ds_prev_snap_obj; | |
2849 | } | |
2850 | ||
2851 | return (0); | |
2852 | } | |
2853 | ||
2854 | static int | |
2855 | snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep) | |
2856 | { | |
2857 | struct promotenode *snap; | |
2858 | ||
2859 | *spacep = 0; | |
2860 | for (snap = list_head(l); snap; snap = list_next(l, snap)) { | |
2861 | uint64_t used; | |
2862 | int err = bplist_space_birthrange(&snap->ds->ds_deadlist, | |
2863 | mintxg, UINT64_MAX, &used); | |
2864 | if (err) | |
2865 | return (err); | |
2866 | *spacep += used; | |
2867 | } | |
2868 | return (0); | |
2869 | } | |
2870 | ||
2871 | static void | |
2872 | snaplist_destroy(list_t *l, boolean_t own) | |
2873 | { | |
2874 | struct promotenode *snap; | |
2875 | ||
9babb374 | 2876 | if (!l || !list_link_active(&l->list_head)) |
b128c09f BB |
2877 | return; |
2878 | ||
2879 | while ((snap = list_tail(l)) != NULL) { | |
2880 | list_remove(l, snap); | |
2881 | if (own) | |
2882 | dsl_dataset_disown(snap->ds, snaplist_tag); | |
2883 | else | |
2884 | dsl_dataset_rele(snap->ds, snaplist_tag); | |
2885 | kmem_free(snap, sizeof (struct promotenode)); | |
2886 | } | |
2887 | list_destroy(l); | |
2888 | } | |
2889 | ||
2890 | /* | |
2891 | * Promote a clone. Nomenclature note: | |
2892 | * "clone" or "cds": the original clone which is being promoted | |
2893 | * "origin" or "ods": the snapshot which is originally clone's origin | |
2894 | * "origin head" or "ohds": the dataset which is the head | |
2895 | * (filesystem/volume) for the origin | |
2896 | * "origin origin": the origin of the origin's filesystem (typically | |
2897 | * NULL, indicating that the clone is not a clone of a clone). | |
2898 | */ | |
34dc7c2f BB |
2899 | int |
2900 | dsl_dataset_promote(const char *name) | |
2901 | { | |
2902 | dsl_dataset_t *ds; | |
b128c09f BB |
2903 | dsl_dir_t *dd; |
2904 | dsl_pool_t *dp; | |
34dc7c2f | 2905 | dmu_object_info_t doi; |
b128c09f BB |
2906 | struct promotearg pa = { 0 }; |
2907 | struct promotenode *snap; | |
2908 | int err; | |
34dc7c2f | 2909 | |
b128c09f | 2910 | err = dsl_dataset_hold(name, FTAG, &ds); |
34dc7c2f BB |
2911 | if (err) |
2912 | return (err); | |
b128c09f BB |
2913 | dd = ds->ds_dir; |
2914 | dp = dd->dd_pool; | |
34dc7c2f | 2915 | |
b128c09f | 2916 | err = dmu_object_info(dp->dp_meta_objset, |
34dc7c2f BB |
2917 | ds->ds_phys->ds_snapnames_zapobj, &doi); |
2918 | if (err) { | |
b128c09f | 2919 | dsl_dataset_rele(ds, FTAG); |
34dc7c2f BB |
2920 | return (err); |
2921 | } | |
2922 | ||
b128c09f BB |
2923 | if (dsl_dataset_is_snapshot(ds) || dd->dd_phys->dd_origin_obj == 0) { |
2924 | dsl_dataset_rele(ds, FTAG); | |
2925 | return (EINVAL); | |
2926 | } | |
2927 | ||
2928 | /* | |
2929 | * We are going to inherit all the snapshots taken before our | |
2930 | * origin (i.e., our new origin will be our parent's origin). | |
2931 | * Take ownership of them so that we can rename them into our | |
2932 | * namespace. | |
2933 | */ | |
2934 | rw_enter(&dp->dp_config_rwlock, RW_READER); | |
2935 | ||
2936 | err = snaplist_make(dp, B_TRUE, 0, dd->dd_phys->dd_origin_obj, | |
2937 | &pa.shared_snaps); | |
2938 | if (err != 0) | |
2939 | goto out; | |
2940 | ||
2941 | err = snaplist_make(dp, B_FALSE, 0, ds->ds_object, &pa.clone_snaps); | |
2942 | if (err != 0) | |
2943 | goto out; | |
2944 | ||
2945 | snap = list_head(&pa.shared_snaps); | |
2946 | ASSERT3U(snap->ds->ds_object, ==, dd->dd_phys->dd_origin_obj); | |
2947 | err = snaplist_make(dp, B_FALSE, dd->dd_phys->dd_origin_obj, | |
2948 | snap->ds->ds_dir->dd_phys->dd_head_dataset_obj, &pa.origin_snaps); | |
2949 | if (err != 0) | |
2950 | goto out; | |
2951 | ||
2952 | if (dsl_dir_is_clone(snap->ds->ds_dir)) { | |
2953 | err = dsl_dataset_own_obj(dp, | |
2954 | snap->ds->ds_dir->dd_phys->dd_origin_obj, | |
2955 | 0, FTAG, &pa.origin_origin); | |
2956 | if (err != 0) | |
2957 | goto out; | |
2958 | } | |
2959 | ||
2960 | out: | |
2961 | rw_exit(&dp->dp_config_rwlock); | |
2962 | ||
34dc7c2f BB |
2963 | /* |
2964 | * Add in 128x the snapnames zapobj size, since we will be moving | |
2965 | * a bunch of snapnames to the promoted ds, and dirtying their | |
2966 | * bonus buffers. | |
2967 | */ | |
b128c09f BB |
2968 | if (err == 0) { |
2969 | err = dsl_sync_task_do(dp, dsl_dataset_promote_check, | |
2970 | dsl_dataset_promote_sync, ds, &pa, | |
2971 | 2 + 2 * doi.doi_physical_blks); | |
2972 | } | |
2973 | ||
2974 | snaplist_destroy(&pa.shared_snaps, B_TRUE); | |
2975 | snaplist_destroy(&pa.clone_snaps, B_FALSE); | |
2976 | snaplist_destroy(&pa.origin_snaps, B_FALSE); | |
2977 | if (pa.origin_origin) | |
2978 | dsl_dataset_disown(pa.origin_origin, FTAG); | |
2979 | dsl_dataset_rele(ds, FTAG); | |
34dc7c2f BB |
2980 | return (err); |
2981 | } | |
2982 | ||
2983 | struct cloneswaparg { | |
2984 | dsl_dataset_t *cds; /* clone dataset */ | |
2985 | dsl_dataset_t *ohds; /* origin's head dataset */ | |
2986 | boolean_t force; | |
2987 | int64_t unused_refres_delta; /* change in unconsumed refreservation */ | |
2988 | }; | |
2989 | ||
2990 | /* ARGSUSED */ | |
2991 | static int | |
2992 | dsl_dataset_clone_swap_check(void *arg1, void *arg2, dmu_tx_t *tx) | |
2993 | { | |
2994 | struct cloneswaparg *csa = arg1; | |
2995 | ||
2996 | /* they should both be heads */ | |
2997 | if (dsl_dataset_is_snapshot(csa->cds) || | |
2998 | dsl_dataset_is_snapshot(csa->ohds)) | |
2999 | return (EINVAL); | |
3000 | ||
3001 | /* the branch point should be just before them */ | |
3002 | if (csa->cds->ds_prev != csa->ohds->ds_prev) | |
3003 | return (EINVAL); | |
3004 | ||
3005 | /* cds should be the clone */ | |
3006 | if (csa->cds->ds_prev->ds_phys->ds_next_snap_obj != | |
3007 | csa->ohds->ds_object) | |
3008 | return (EINVAL); | |
3009 | ||
3010 | /* the clone should be a child of the origin */ | |
3011 | if (csa->cds->ds_dir->dd_parent != csa->ohds->ds_dir) | |
3012 | return (EINVAL); | |
3013 | ||
3014 | /* ohds shouldn't be modified unless 'force' */ | |
3015 | if (!csa->force && dsl_dataset_modified_since_lastsnap(csa->ohds)) | |
3016 | return (ETXTBSY); | |
3017 | ||
3018 | /* adjust amount of any unconsumed refreservation */ | |
3019 | csa->unused_refres_delta = | |
3020 | (int64_t)MIN(csa->ohds->ds_reserved, | |
3021 | csa->ohds->ds_phys->ds_unique_bytes) - | |
3022 | (int64_t)MIN(csa->ohds->ds_reserved, | |
3023 | csa->cds->ds_phys->ds_unique_bytes); | |
3024 | ||
3025 | if (csa->unused_refres_delta > 0 && | |
3026 | csa->unused_refres_delta > | |
3027 | dsl_dir_space_available(csa->ohds->ds_dir, NULL, 0, TRUE)) | |
3028 | return (ENOSPC); | |
3029 | ||
3030 | return (0); | |
3031 | } | |
3032 | ||
3033 | /* ARGSUSED */ | |
3034 | static void | |
3035 | dsl_dataset_clone_swap_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) | |
3036 | { | |
3037 | struct cloneswaparg *csa = arg1; | |
3038 | dsl_pool_t *dp = csa->cds->ds_dir->dd_pool; | |
34dc7c2f BB |
3039 | |
3040 | ASSERT(csa->cds->ds_reserved == 0); | |
3041 | ASSERT(csa->cds->ds_quota == csa->ohds->ds_quota); | |
3042 | ||
3043 | dmu_buf_will_dirty(csa->cds->ds_dbuf, tx); | |
3044 | dmu_buf_will_dirty(csa->ohds->ds_dbuf, tx); | |
3045 | dmu_buf_will_dirty(csa->cds->ds_prev->ds_dbuf, tx); | |
3046 | ||
3047 | if (csa->cds->ds_user_ptr != NULL) { | |
3048 | csa->cds->ds_user_evict_func(csa->cds, csa->cds->ds_user_ptr); | |
3049 | csa->cds->ds_user_ptr = NULL; | |
3050 | } | |
3051 | ||
3052 | if (csa->ohds->ds_user_ptr != NULL) { | |
3053 | csa->ohds->ds_user_evict_func(csa->ohds, | |
3054 | csa->ohds->ds_user_ptr); | |
3055 | csa->ohds->ds_user_ptr = NULL; | |
3056 | } | |
3057 | ||
34dc7c2f | 3058 | /* reset origin's unique bytes */ |
b128c09f BB |
3059 | VERIFY(0 == bplist_space_birthrange(&csa->cds->ds_deadlist, |
3060 | csa->cds->ds_prev->ds_phys->ds_prev_snap_txg, UINT64_MAX, | |
3061 | &csa->cds->ds_prev->ds_phys->ds_unique_bytes)); | |
34dc7c2f BB |
3062 | |
3063 | /* swap blkptrs */ | |
3064 | { | |
3065 | blkptr_t tmp; | |
3066 | tmp = csa->ohds->ds_phys->ds_bp; | |
3067 | csa->ohds->ds_phys->ds_bp = csa->cds->ds_phys->ds_bp; | |
3068 | csa->cds->ds_phys->ds_bp = tmp; | |
3069 | } | |
3070 | ||
3071 | /* set dd_*_bytes */ | |
3072 | { | |
3073 | int64_t dused, dcomp, duncomp; | |
3074 | uint64_t cdl_used, cdl_comp, cdl_uncomp; | |
3075 | uint64_t odl_used, odl_comp, odl_uncomp; | |
3076 | ||
b128c09f BB |
3077 | ASSERT3U(csa->cds->ds_dir->dd_phys-> |
3078 | dd_used_breakdown[DD_USED_SNAP], ==, 0); | |
3079 | ||
34dc7c2f BB |
3080 | VERIFY(0 == bplist_space(&csa->cds->ds_deadlist, &cdl_used, |
3081 | &cdl_comp, &cdl_uncomp)); | |
3082 | VERIFY(0 == bplist_space(&csa->ohds->ds_deadlist, &odl_used, | |
3083 | &odl_comp, &odl_uncomp)); | |
b128c09f | 3084 | |
34dc7c2f BB |
3085 | dused = csa->cds->ds_phys->ds_used_bytes + cdl_used - |
3086 | (csa->ohds->ds_phys->ds_used_bytes + odl_used); | |
3087 | dcomp = csa->cds->ds_phys->ds_compressed_bytes + cdl_comp - | |
3088 | (csa->ohds->ds_phys->ds_compressed_bytes + odl_comp); | |
3089 | duncomp = csa->cds->ds_phys->ds_uncompressed_bytes + | |
3090 | cdl_uncomp - | |
3091 | (csa->ohds->ds_phys->ds_uncompressed_bytes + odl_uncomp); | |
3092 | ||
b128c09f | 3093 | dsl_dir_diduse_space(csa->ohds->ds_dir, DD_USED_HEAD, |
34dc7c2f | 3094 | dused, dcomp, duncomp, tx); |
b128c09f | 3095 | dsl_dir_diduse_space(csa->cds->ds_dir, DD_USED_HEAD, |
34dc7c2f | 3096 | -dused, -dcomp, -duncomp, tx); |
b128c09f BB |
3097 | |
3098 | /* | |
3099 | * The difference in the space used by snapshots is the | |
3100 | * difference in snapshot space due to the head's | |
3101 | * deadlist (since that's the only thing that's | |
3102 | * changing that affects the snapused). | |
3103 | */ | |
3104 | VERIFY(0 == bplist_space_birthrange(&csa->cds->ds_deadlist, | |
3105 | csa->ohds->ds_origin_txg, UINT64_MAX, &cdl_used)); | |
3106 | VERIFY(0 == bplist_space_birthrange(&csa->ohds->ds_deadlist, | |
3107 | csa->ohds->ds_origin_txg, UINT64_MAX, &odl_used)); | |
3108 | dsl_dir_transfer_space(csa->ohds->ds_dir, cdl_used - odl_used, | |
3109 | DD_USED_HEAD, DD_USED_SNAP, tx); | |
34dc7c2f BB |
3110 | } |
3111 | ||
3112 | #define SWITCH64(x, y) \ | |
3113 | { \ | |
3114 | uint64_t __tmp = (x); \ | |
3115 | (x) = (y); \ | |
3116 | (y) = __tmp; \ | |
3117 | } | |
3118 | ||
3119 | /* swap ds_*_bytes */ | |
3120 | SWITCH64(csa->ohds->ds_phys->ds_used_bytes, | |
3121 | csa->cds->ds_phys->ds_used_bytes); | |
3122 | SWITCH64(csa->ohds->ds_phys->ds_compressed_bytes, | |
3123 | csa->cds->ds_phys->ds_compressed_bytes); | |
3124 | SWITCH64(csa->ohds->ds_phys->ds_uncompressed_bytes, | |
3125 | csa->cds->ds_phys->ds_uncompressed_bytes); | |
3126 | SWITCH64(csa->ohds->ds_phys->ds_unique_bytes, | |
3127 | csa->cds->ds_phys->ds_unique_bytes); | |
3128 | ||
3129 | /* apply any parent delta for change in unconsumed refreservation */ | |
b128c09f BB |
3130 | dsl_dir_diduse_space(csa->ohds->ds_dir, DD_USED_REFRSRV, |
3131 | csa->unused_refres_delta, 0, 0, tx); | |
34dc7c2f BB |
3132 | |
3133 | /* swap deadlists */ | |
3134 | bplist_close(&csa->cds->ds_deadlist); | |
3135 | bplist_close(&csa->ohds->ds_deadlist); | |
3136 | SWITCH64(csa->ohds->ds_phys->ds_deadlist_obj, | |
3137 | csa->cds->ds_phys->ds_deadlist_obj); | |
3138 | VERIFY(0 == bplist_open(&csa->cds->ds_deadlist, dp->dp_meta_objset, | |
3139 | csa->cds->ds_phys->ds_deadlist_obj)); | |
3140 | VERIFY(0 == bplist_open(&csa->ohds->ds_deadlist, dp->dp_meta_objset, | |
3141 | csa->ohds->ds_phys->ds_deadlist_obj)); | |
b128c09f BB |
3142 | |
3143 | dsl_pool_ds_clone_swapped(csa->ohds, csa->cds, tx); | |
34dc7c2f BB |
3144 | } |
3145 | ||
3146 | /* | |
b128c09f BB |
3147 | * Swap 'clone' with its origin head file system. Used at the end |
3148 | * of "online recv" to swizzle the file system to the new version. | |
34dc7c2f BB |
3149 | */ |
3150 | int | |
3151 | dsl_dataset_clone_swap(dsl_dataset_t *clone, dsl_dataset_t *origin_head, | |
3152 | boolean_t force) | |
3153 | { | |
3154 | struct cloneswaparg csa; | |
b128c09f | 3155 | int error; |
34dc7c2f | 3156 | |
b128c09f BB |
3157 | ASSERT(clone->ds_owner); |
3158 | ASSERT(origin_head->ds_owner); | |
3159 | retry: | |
3160 | /* Need exclusive access for the swap */ | |
3161 | rw_enter(&clone->ds_rwlock, RW_WRITER); | |
3162 | if (!rw_tryenter(&origin_head->ds_rwlock, RW_WRITER)) { | |
3163 | rw_exit(&clone->ds_rwlock); | |
3164 | rw_enter(&origin_head->ds_rwlock, RW_WRITER); | |
3165 | if (!rw_tryenter(&clone->ds_rwlock, RW_WRITER)) { | |
3166 | rw_exit(&origin_head->ds_rwlock); | |
3167 | goto retry; | |
3168 | } | |
3169 | } | |
34dc7c2f BB |
3170 | csa.cds = clone; |
3171 | csa.ohds = origin_head; | |
3172 | csa.force = force; | |
b128c09f | 3173 | error = dsl_sync_task_do(clone->ds_dir->dd_pool, |
34dc7c2f | 3174 | dsl_dataset_clone_swap_check, |
b128c09f BB |
3175 | dsl_dataset_clone_swap_sync, &csa, NULL, 9); |
3176 | return (error); | |
34dc7c2f BB |
3177 | } |
3178 | ||
3179 | /* | |
3180 | * Given a pool name and a dataset object number in that pool, | |
3181 | * return the name of that dataset. | |
3182 | */ | |
3183 | int | |
3184 | dsl_dsobj_to_dsname(char *pname, uint64_t obj, char *buf) | |
3185 | { | |
3186 | spa_t *spa; | |
3187 | dsl_pool_t *dp; | |
b128c09f | 3188 | dsl_dataset_t *ds; |
34dc7c2f BB |
3189 | int error; |
3190 | ||
3191 | if ((error = spa_open(pname, &spa, FTAG)) != 0) | |
3192 | return (error); | |
3193 | dp = spa_get_dsl(spa); | |
3194 | rw_enter(&dp->dp_config_rwlock, RW_READER); | |
b128c09f BB |
3195 | if ((error = dsl_dataset_hold_obj(dp, obj, FTAG, &ds)) == 0) { |
3196 | dsl_dataset_name(ds, buf); | |
3197 | dsl_dataset_rele(ds, FTAG); | |
34dc7c2f | 3198 | } |
34dc7c2f BB |
3199 | rw_exit(&dp->dp_config_rwlock); |
3200 | spa_close(spa, FTAG); | |
3201 | ||
b128c09f | 3202 | return (error); |
34dc7c2f BB |
3203 | } |
3204 | ||
3205 | int | |
3206 | dsl_dataset_check_quota(dsl_dataset_t *ds, boolean_t check_quota, | |
b128c09f | 3207 | uint64_t asize, uint64_t inflight, uint64_t *used, uint64_t *ref_rsrv) |
34dc7c2f BB |
3208 | { |
3209 | int error = 0; | |
3210 | ||
3211 | ASSERT3S(asize, >, 0); | |
3212 | ||
3213 | /* | |
3214 | * *ref_rsrv is the portion of asize that will come from any | |
3215 | * unconsumed refreservation space. | |
3216 | */ | |
3217 | *ref_rsrv = 0; | |
3218 | ||
3219 | mutex_enter(&ds->ds_lock); | |
3220 | /* | |
3221 | * Make a space adjustment for reserved bytes. | |
3222 | */ | |
3223 | if (ds->ds_reserved > ds->ds_phys->ds_unique_bytes) { | |
3224 | ASSERT3U(*used, >=, | |
3225 | ds->ds_reserved - ds->ds_phys->ds_unique_bytes); | |
3226 | *used -= (ds->ds_reserved - ds->ds_phys->ds_unique_bytes); | |
3227 | *ref_rsrv = | |
3228 | asize - MIN(asize, parent_delta(ds, asize + inflight)); | |
3229 | } | |
3230 | ||
3231 | if (!check_quota || ds->ds_quota == 0) { | |
3232 | mutex_exit(&ds->ds_lock); | |
3233 | return (0); | |
3234 | } | |
3235 | /* | |
3236 | * If they are requesting more space, and our current estimate | |
3237 | * is over quota, they get to try again unless the actual | |
3238 | * on-disk is over quota and there are no pending changes (which | |
3239 | * may free up space for us). | |
3240 | */ | |
3241 | if (ds->ds_phys->ds_used_bytes + inflight >= ds->ds_quota) { | |
3242 | if (inflight > 0 || ds->ds_phys->ds_used_bytes < ds->ds_quota) | |
3243 | error = ERESTART; | |
3244 | else | |
3245 | error = EDQUOT; | |
3246 | } | |
3247 | mutex_exit(&ds->ds_lock); | |
3248 | ||
3249 | return (error); | |
3250 | } | |
3251 | ||
3252 | /* ARGSUSED */ | |
3253 | static int | |
3254 | dsl_dataset_set_quota_check(void *arg1, void *arg2, dmu_tx_t *tx) | |
3255 | { | |
3256 | dsl_dataset_t *ds = arg1; | |
3257 | uint64_t *quotap = arg2; | |
3258 | uint64_t new_quota = *quotap; | |
3259 | ||
3260 | if (spa_version(ds->ds_dir->dd_pool->dp_spa) < SPA_VERSION_REFQUOTA) | |
3261 | return (ENOTSUP); | |
3262 | ||
3263 | if (new_quota == 0) | |
3264 | return (0); | |
3265 | ||
3266 | if (new_quota < ds->ds_phys->ds_used_bytes || | |
3267 | new_quota < ds->ds_reserved) | |
3268 | return (ENOSPC); | |
3269 | ||
3270 | return (0); | |
3271 | } | |
3272 | ||
3273 | /* ARGSUSED */ | |
3274 | void | |
3275 | dsl_dataset_set_quota_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) | |
3276 | { | |
3277 | dsl_dataset_t *ds = arg1; | |
3278 | uint64_t *quotap = arg2; | |
3279 | uint64_t new_quota = *quotap; | |
3280 | ||
3281 | dmu_buf_will_dirty(ds->ds_dbuf, tx); | |
3282 | ||
34dc7c2f | 3283 | ds->ds_quota = new_quota; |
34dc7c2f | 3284 | |
45d1cae3 | 3285 | dsl_dir_prop_set_uint64_sync(ds->ds_dir, "refquota", new_quota, cr, tx); |
34dc7c2f BB |
3286 | |
3287 | spa_history_internal_log(LOG_DS_REFQUOTA, ds->ds_dir->dd_pool->dp_spa, | |
3288 | tx, cr, "%lld dataset = %llu ", | |
b128c09f | 3289 | (longlong_t)new_quota, ds->ds_object); |
34dc7c2f BB |
3290 | } |
3291 | ||
3292 | int | |
3293 | dsl_dataset_set_quota(const char *dsname, uint64_t quota) | |
3294 | { | |
3295 | dsl_dataset_t *ds; | |
3296 | int err; | |
3297 | ||
b128c09f | 3298 | err = dsl_dataset_hold(dsname, FTAG, &ds); |
34dc7c2f BB |
3299 | if (err) |
3300 | return (err); | |
3301 | ||
3302 | if (quota != ds->ds_quota) { | |
3303 | /* | |
3304 | * If someone removes a file, then tries to set the quota, we | |
3305 | * want to make sure the file freeing takes effect. | |
3306 | */ | |
3307 | txg_wait_open(ds->ds_dir->dd_pool, 0); | |
3308 | ||
3309 | err = dsl_sync_task_do(ds->ds_dir->dd_pool, | |
3310 | dsl_dataset_set_quota_check, dsl_dataset_set_quota_sync, | |
3311 | ds, "a, 0); | |
3312 | } | |
b128c09f | 3313 | dsl_dataset_rele(ds, FTAG); |
34dc7c2f BB |
3314 | return (err); |
3315 | } | |
3316 | ||
3317 | static int | |
3318 | dsl_dataset_set_reservation_check(void *arg1, void *arg2, dmu_tx_t *tx) | |
3319 | { | |
3320 | dsl_dataset_t *ds = arg1; | |
3321 | uint64_t *reservationp = arg2; | |
3322 | uint64_t new_reservation = *reservationp; | |
34dc7c2f BB |
3323 | uint64_t unique; |
3324 | ||
34dc7c2f BB |
3325 | if (spa_version(ds->ds_dir->dd_pool->dp_spa) < |
3326 | SPA_VERSION_REFRESERVATION) | |
3327 | return (ENOTSUP); | |
3328 | ||
3329 | if (dsl_dataset_is_snapshot(ds)) | |
3330 | return (EINVAL); | |
3331 | ||
3332 | /* | |
3333 | * If we are doing the preliminary check in open context, the | |
3334 | * space estimates may be inaccurate. | |
3335 | */ | |
3336 | if (!dmu_tx_is_syncing(tx)) | |
3337 | return (0); | |
3338 | ||
3339 | mutex_enter(&ds->ds_lock); | |
3340 | unique = dsl_dataset_unique(ds); | |
34dc7c2f BB |
3341 | mutex_exit(&ds->ds_lock); |
3342 | ||
d164b209 BB |
3343 | if (MAX(unique, new_reservation) > MAX(unique, ds->ds_reserved)) { |
3344 | uint64_t delta = MAX(unique, new_reservation) - | |
3345 | MAX(unique, ds->ds_reserved); | |
3346 | ||
3347 | if (delta > dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) | |
3348 | return (ENOSPC); | |
3349 | if (ds->ds_quota > 0 && | |
3350 | new_reservation > ds->ds_quota) | |
3351 | return (ENOSPC); | |
3352 | } | |
34dc7c2f BB |
3353 | |
3354 | return (0); | |
3355 | } | |
3356 | ||
3357 | /* ARGSUSED */ | |
3358 | static void | |
3359 | dsl_dataset_set_reservation_sync(void *arg1, void *arg2, cred_t *cr, | |
3360 | dmu_tx_t *tx) | |
3361 | { | |
3362 | dsl_dataset_t *ds = arg1; | |
3363 | uint64_t *reservationp = arg2; | |
3364 | uint64_t new_reservation = *reservationp; | |
3365 | uint64_t unique; | |
3366 | int64_t delta; | |
3367 | ||
3368 | dmu_buf_will_dirty(ds->ds_dbuf, tx); | |
3369 | ||
b128c09f | 3370 | mutex_enter(&ds->ds_dir->dd_lock); |
34dc7c2f BB |
3371 | mutex_enter(&ds->ds_lock); |
3372 | unique = dsl_dataset_unique(ds); | |
3373 | delta = MAX(0, (int64_t)(new_reservation - unique)) - | |
3374 | MAX(0, (int64_t)(ds->ds_reserved - unique)); | |
3375 | ds->ds_reserved = new_reservation; | |
3376 | mutex_exit(&ds->ds_lock); | |
3377 | ||
b128c09f BB |
3378 | dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, delta, 0, 0, tx); |
3379 | mutex_exit(&ds->ds_dir->dd_lock); | |
45d1cae3 | 3380 | dsl_dir_prop_set_uint64_sync(ds->ds_dir, "refreservation", |
34dc7c2f BB |
3381 | new_reservation, cr, tx); |
3382 | ||
34dc7c2f BB |
3383 | spa_history_internal_log(LOG_DS_REFRESERV, |
3384 | ds->ds_dir->dd_pool->dp_spa, tx, cr, "%lld dataset = %llu", | |
b128c09f | 3385 | (longlong_t)new_reservation, ds->ds_object); |
34dc7c2f BB |
3386 | } |
3387 | ||
3388 | int | |
3389 | dsl_dataset_set_reservation(const char *dsname, uint64_t reservation) | |
3390 | { | |
3391 | dsl_dataset_t *ds; | |
3392 | int err; | |
3393 | ||
b128c09f | 3394 | err = dsl_dataset_hold(dsname, FTAG, &ds); |
34dc7c2f BB |
3395 | if (err) |
3396 | return (err); | |
3397 | ||
3398 | err = dsl_sync_task_do(ds->ds_dir->dd_pool, | |
3399 | dsl_dataset_set_reservation_check, | |
3400 | dsl_dataset_set_reservation_sync, ds, &reservation, 0); | |
b128c09f | 3401 | dsl_dataset_rele(ds, FTAG); |
34dc7c2f BB |
3402 | return (err); |
3403 | } | |
45d1cae3 BB |
3404 | |
3405 | static int | |
3406 | dsl_dataset_user_hold_check(void *arg1, void *arg2, dmu_tx_t *tx) | |
3407 | { | |
3408 | dsl_dataset_t *ds = arg1; | |
3409 | char *htag = arg2; | |
3410 | objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; | |
3411 | int error = 0; | |
3412 | ||
3413 | if (spa_version(ds->ds_dir->dd_pool->dp_spa) < SPA_VERSION_USERREFS) | |
3414 | return (ENOTSUP); | |
3415 | ||
3416 | if (!dsl_dataset_is_snapshot(ds)) | |
3417 | return (EINVAL); | |
3418 | ||
3419 | if (strlen(htag) >= ZAP_MAXNAMELEN) | |
3420 | return (ENAMETOOLONG); | |
3421 | ||
3422 | /* tags must be unique */ | |
3423 | mutex_enter(&ds->ds_lock); | |
3424 | if (ds->ds_phys->ds_userrefs_obj) { | |
3425 | error = zap_lookup(mos, ds->ds_phys->ds_userrefs_obj, htag, | |
3426 | 8, 1, tx); | |
3427 | if (error == 0) | |
3428 | error = EEXIST; | |
3429 | else if (error == ENOENT) | |
3430 | error = 0; | |
3431 | } | |
3432 | mutex_exit(&ds->ds_lock); | |
3433 | ||
3434 | return (error); | |
3435 | } | |
3436 | ||
3437 | static void | |
3438 | dsl_dataset_user_hold_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) | |
3439 | { | |
3440 | dsl_dataset_t *ds = arg1; | |
3441 | char *htag = arg2; | |
3442 | objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; | |
3443 | time_t now = gethrestime_sec(); | |
3444 | uint64_t zapobj; | |
3445 | ||
3446 | mutex_enter(&ds->ds_lock); | |
3447 | if (ds->ds_phys->ds_userrefs_obj == 0) { | |
3448 | /* | |
3449 | * This is the first user hold for this dataset. Create | |
3450 | * the userrefs zap object. | |
3451 | */ | |
3452 | dmu_buf_will_dirty(ds->ds_dbuf, tx); | |
3453 | zapobj = ds->ds_phys->ds_userrefs_obj = | |
3454 | zap_create(mos, DMU_OT_USERREFS, DMU_OT_NONE, 0, tx); | |
3455 | } else { | |
3456 | zapobj = ds->ds_phys->ds_userrefs_obj; | |
3457 | } | |
3458 | ds->ds_userrefs++; | |
3459 | mutex_exit(&ds->ds_lock); | |
3460 | ||
3461 | VERIFY(0 == zap_add(mos, zapobj, htag, 8, 1, &now, tx)); | |
3462 | ||
3463 | spa_history_internal_log(LOG_DS_USER_HOLD, | |
3464 | ds->ds_dir->dd_pool->dp_spa, tx, cr, "<%s> dataset = %llu", | |
3465 | htag, ds->ds_object); | |
3466 | } | |
3467 | ||
3468 | struct dsl_ds_holdarg { | |
3469 | dsl_sync_task_group_t *dstg; | |
3470 | char *htag; | |
3471 | char *snapname; | |
3472 | boolean_t recursive; | |
3473 | char failed[MAXPATHLEN]; | |
3474 | }; | |
3475 | ||
3476 | static int | |
3477 | dsl_dataset_user_hold_one(char *dsname, void *arg) | |
3478 | { | |
3479 | struct dsl_ds_holdarg *ha = arg; | |
3480 | dsl_dataset_t *ds; | |
3481 | int error; | |
3482 | char *name; | |
3483 | size_t buflen; | |
3484 | ||
3485 | /* alloc a buffer to hold dsname@snapname plus terminating NULL */ | |
3486 | buflen = strlen(dsname) + strlen(ha->snapname) + 2; | |
3487 | name = kmem_alloc(buflen, KM_SLEEP); | |
3488 | (void) snprintf(name, buflen, "%s@%s", dsname, ha->snapname); | |
3489 | error = dsl_dataset_hold(name, ha->dstg, &ds); | |
3490 | kmem_free(name, buflen); | |
3491 | if (error == 0) { | |
3492 | dsl_sync_task_create(ha->dstg, dsl_dataset_user_hold_check, | |
3493 | dsl_dataset_user_hold_sync, ds, ha->htag, 0); | |
3494 | } else if (error == ENOENT && ha->recursive) { | |
3495 | error = 0; | |
3496 | } else { | |
3497 | (void) strcpy(ha->failed, dsname); | |
3498 | } | |
3499 | return (error); | |
3500 | } | |
3501 | ||
3502 | int | |
3503 | dsl_dataset_user_hold(char *dsname, char *snapname, char *htag, | |
3504 | boolean_t recursive) | |
3505 | { | |
3506 | struct dsl_ds_holdarg *ha; | |
3507 | dsl_sync_task_t *dst; | |
3508 | spa_t *spa; | |
3509 | int error; | |
3510 | ||
3511 | ha = kmem_zalloc(sizeof (struct dsl_ds_holdarg), KM_SLEEP); | |
3512 | ||
3513 | (void) strlcpy(ha->failed, dsname, sizeof (ha->failed)); | |
3514 | ||
3515 | error = spa_open(dsname, &spa, FTAG); | |
3516 | if (error) { | |
3517 | kmem_free(ha, sizeof (struct dsl_ds_holdarg)); | |
3518 | return (error); | |
3519 | } | |
3520 | ||
3521 | ha->dstg = dsl_sync_task_group_create(spa_get_dsl(spa)); | |
3522 | ha->htag = htag; | |
3523 | ha->snapname = snapname; | |
3524 | ha->recursive = recursive; | |
3525 | if (recursive) { | |
3526 | error = dmu_objset_find(dsname, dsl_dataset_user_hold_one, | |
3527 | ha, DS_FIND_CHILDREN); | |
3528 | } else { | |
3529 | error = dsl_dataset_user_hold_one(dsname, ha); | |
3530 | } | |
3531 | if (error == 0) | |
3532 | error = dsl_sync_task_group_wait(ha->dstg); | |
3533 | ||
3534 | for (dst = list_head(&ha->dstg->dstg_tasks); dst; | |
3535 | dst = list_next(&ha->dstg->dstg_tasks, dst)) { | |
3536 | dsl_dataset_t *ds = dst->dst_arg1; | |
3537 | ||
3538 | if (dst->dst_err) { | |
3539 | dsl_dataset_name(ds, ha->failed); | |
3540 | *strchr(ha->failed, '@') = '\0'; | |
3541 | } | |
3542 | dsl_dataset_rele(ds, ha->dstg); | |
3543 | } | |
3544 | ||
3545 | if (error) | |
3546 | (void) strcpy(dsname, ha->failed); | |
3547 | ||
3548 | dsl_sync_task_group_destroy(ha->dstg); | |
3549 | kmem_free(ha, sizeof (struct dsl_ds_holdarg)); | |
3550 | spa_close(spa, FTAG); | |
3551 | return (error); | |
3552 | } | |
3553 | ||
3554 | struct dsl_ds_releasearg { | |
3555 | dsl_dataset_t *ds; | |
3556 | const char *htag; | |
3557 | boolean_t own; /* do we own or just hold ds? */ | |
3558 | }; | |
3559 | ||
3560 | static int | |
3561 | dsl_dataset_release_might_destroy(dsl_dataset_t *ds, const char *htag, | |
3562 | boolean_t *might_destroy) | |
3563 | { | |
3564 | objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; | |
3565 | uint64_t zapobj; | |
3566 | uint64_t tmp; | |
3567 | int error; | |
3568 | ||
3569 | *might_destroy = B_FALSE; | |
3570 | ||
3571 | mutex_enter(&ds->ds_lock); | |
3572 | zapobj = ds->ds_phys->ds_userrefs_obj; | |
3573 | if (zapobj == 0) { | |
3574 | /* The tag can't possibly exist */ | |
3575 | mutex_exit(&ds->ds_lock); | |
3576 | return (ESRCH); | |
3577 | } | |
3578 | ||
3579 | /* Make sure the tag exists */ | |
3580 | error = zap_lookup(mos, zapobj, htag, 8, 1, &tmp); | |
3581 | if (error) { | |
3582 | mutex_exit(&ds->ds_lock); | |
3583 | if (error == ENOENT) | |
3584 | error = ESRCH; | |
3585 | return (error); | |
3586 | } | |
3587 | ||
3588 | if (ds->ds_userrefs == 1 && ds->ds_phys->ds_num_children == 1 && | |
3589 | DS_IS_DEFER_DESTROY(ds)) | |
3590 | *might_destroy = B_TRUE; | |
3591 | ||
3592 | mutex_exit(&ds->ds_lock); | |
3593 | return (0); | |
3594 | } | |
3595 | ||
3596 | static int | |
3597 | dsl_dataset_user_release_check(void *arg1, void *tag, dmu_tx_t *tx) | |
3598 | { | |
3599 | struct dsl_ds_releasearg *ra = arg1; | |
3600 | dsl_dataset_t *ds = ra->ds; | |
3601 | boolean_t might_destroy; | |
3602 | int error; | |
3603 | ||
3604 | if (spa_version(ds->ds_dir->dd_pool->dp_spa) < SPA_VERSION_USERREFS) | |
3605 | return (ENOTSUP); | |
3606 | ||
3607 | error = dsl_dataset_release_might_destroy(ds, ra->htag, &might_destroy); | |
3608 | if (error) | |
3609 | return (error); | |
3610 | ||
3611 | if (might_destroy) { | |
3612 | struct dsl_ds_destroyarg dsda = {0}; | |
3613 | ||
3614 | if (dmu_tx_is_syncing(tx)) { | |
3615 | /* | |
3616 | * If we're not prepared to remove the snapshot, | |
3617 | * we can't allow the release to happen right now. | |
3618 | */ | |
3619 | if (!ra->own) | |
3620 | return (EBUSY); | |
3621 | if (ds->ds_user_ptr) { | |
3622 | ds->ds_user_evict_func(ds, ds->ds_user_ptr); | |
3623 | ds->ds_user_ptr = NULL; | |
3624 | } | |
3625 | } | |
3626 | dsda.ds = ds; | |
3627 | dsda.releasing = B_TRUE; | |
3628 | return (dsl_dataset_destroy_check(&dsda, tag, tx)); | |
3629 | } | |
3630 | ||
3631 | return (0); | |
3632 | } | |
3633 | ||
3634 | static void | |
3635 | dsl_dataset_user_release_sync(void *arg1, void *tag, cred_t *cr, dmu_tx_t *tx) | |
3636 | { | |
3637 | struct dsl_ds_releasearg *ra = arg1; | |
3638 | dsl_dataset_t *ds = ra->ds; | |
3639 | spa_t *spa = ds->ds_dir->dd_pool->dp_spa; | |
3640 | objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; | |
3641 | uint64_t zapobj; | |
3642 | uint64_t dsobj = ds->ds_object; | |
3643 | uint64_t refs; | |
3644 | ||
3645 | mutex_enter(&ds->ds_lock); | |
3646 | ds->ds_userrefs--; | |
3647 | refs = ds->ds_userrefs; | |
3648 | mutex_exit(&ds->ds_lock); | |
3649 | zapobj = ds->ds_phys->ds_userrefs_obj; | |
3650 | VERIFY(0 == zap_remove(mos, zapobj, ra->htag, tx)); | |
3651 | if (ds->ds_userrefs == 0 && ds->ds_phys->ds_num_children == 1 && | |
3652 | DS_IS_DEFER_DESTROY(ds)) { | |
3653 | struct dsl_ds_destroyarg dsda = {0}; | |
3654 | ||
3655 | ASSERT(ra->own); | |
3656 | dsda.ds = ds; | |
3657 | dsda.releasing = B_TRUE; | |
3658 | /* We already did the destroy_check */ | |
3659 | dsl_dataset_destroy_sync(&dsda, tag, cr, tx); | |
3660 | } | |
3661 | ||
3662 | spa_history_internal_log(LOG_DS_USER_RELEASE, | |
3663 | spa, tx, cr, "<%s> %lld dataset = %llu", | |
3664 | ra->htag, (longlong_t)refs, dsobj); | |
3665 | } | |
3666 | ||
3667 | static int | |
3668 | dsl_dataset_user_release_one(char *dsname, void *arg) | |
3669 | { | |
3670 | struct dsl_ds_holdarg *ha = arg; | |
3671 | struct dsl_ds_releasearg *ra; | |
3672 | dsl_dataset_t *ds; | |
3673 | int error; | |
3674 | void *dtag = ha->dstg; | |
3675 | char *name; | |
3676 | size_t buflen; | |
3677 | boolean_t own = B_FALSE; | |
3678 | boolean_t might_destroy; | |
3679 | ||
3680 | if (strlen(ha->htag) >= ZAP_MAXNAMELEN) | |
3681 | return (ENAMETOOLONG); | |
3682 | ||
3683 | /* alloc a buffer to hold dsname@snapname, plus the terminating NULL */ | |
3684 | buflen = strlen(dsname) + strlen(ha->snapname) + 2; | |
3685 | name = kmem_alloc(buflen, KM_SLEEP); | |
3686 | (void) snprintf(name, buflen, "%s@%s", dsname, ha->snapname); | |
3687 | error = dsl_dataset_hold(name, dtag, &ds); | |
3688 | kmem_free(name, buflen); | |
3689 | if (error == ENOENT && ha->recursive) | |
3690 | return (0); | |
3691 | (void) strcpy(ha->failed, dsname); | |
3692 | if (error) | |
3693 | return (error); | |
3694 | ||
3695 | ASSERT(dsl_dataset_is_snapshot(ds)); | |
3696 | ||
3697 | error = dsl_dataset_release_might_destroy(ds, ha->htag, &might_destroy); | |
3698 | if (error) { | |
3699 | dsl_dataset_rele(ds, dtag); | |
3700 | return (error); | |
3701 | } | |
3702 | ||
3703 | if (might_destroy) { | |
3704 | #ifdef _KERNEL | |
3705 | error = zfs_unmount_snap(name, NULL); | |
3706 | if (error) { | |
3707 | dsl_dataset_rele(ds, dtag); | |
3708 | return (error); | |
3709 | } | |
3710 | error = dsl_dataset_zvol_cleanup(ds, name); | |
3711 | if (error) { | |
3712 | dsl_dataset_rele(ds, dtag); | |
3713 | return (error); | |
3714 | } | |
3715 | #endif | |
3716 | if (!dsl_dataset_tryown(ds, | |
3717 | DS_MODE_READONLY | DS_MODE_INCONSISTENT, dtag)) { | |
3718 | dsl_dataset_rele(ds, dtag); | |
3719 | return (EBUSY); | |
3720 | } else { | |
3721 | own = B_TRUE; | |
3722 | dsl_dataset_make_exclusive(ds, dtag); | |
3723 | } | |
3724 | } | |
3725 | ||
3726 | ra = kmem_alloc(sizeof (struct dsl_ds_releasearg), KM_SLEEP); | |
3727 | ra->ds = ds; | |
3728 | ra->htag = ha->htag; | |
3729 | ra->own = own; | |
3730 | dsl_sync_task_create(ha->dstg, dsl_dataset_user_release_check, | |
3731 | dsl_dataset_user_release_sync, ra, dtag, 0); | |
3732 | ||
3733 | return (0); | |
3734 | } | |
3735 | ||
3736 | int | |
3737 | dsl_dataset_user_release(char *dsname, char *snapname, char *htag, | |
3738 | boolean_t recursive) | |
3739 | { | |
3740 | struct dsl_ds_holdarg *ha; | |
3741 | dsl_sync_task_t *dst; | |
3742 | spa_t *spa; | |
3743 | int error; | |
3744 | ||
3745 | ha = kmem_zalloc(sizeof (struct dsl_ds_holdarg), KM_SLEEP); | |
3746 | ||
3747 | (void) strlcpy(ha->failed, dsname, sizeof (ha->failed)); | |
3748 | ||
3749 | error = spa_open(dsname, &spa, FTAG); | |
3750 | if (error) { | |
3751 | kmem_free(ha, sizeof (struct dsl_ds_holdarg)); | |
3752 | return (error); | |
3753 | } | |
3754 | ||
3755 | ha->dstg = dsl_sync_task_group_create(spa_get_dsl(spa)); | |
3756 | ha->htag = htag; | |
3757 | ha->snapname = snapname; | |
3758 | ha->recursive = recursive; | |
3759 | if (recursive) { | |
3760 | error = dmu_objset_find(dsname, dsl_dataset_user_release_one, | |
3761 | ha, DS_FIND_CHILDREN); | |
3762 | } else { | |
3763 | error = dsl_dataset_user_release_one(dsname, ha); | |
3764 | } | |
3765 | if (error == 0) | |
3766 | error = dsl_sync_task_group_wait(ha->dstg); | |
3767 | ||
3768 | for (dst = list_head(&ha->dstg->dstg_tasks); dst; | |
3769 | dst = list_next(&ha->dstg->dstg_tasks, dst)) { | |
3770 | struct dsl_ds_releasearg *ra = dst->dst_arg1; | |
3771 | dsl_dataset_t *ds = ra->ds; | |
3772 | ||
3773 | if (dst->dst_err) | |
3774 | dsl_dataset_name(ds, ha->failed); | |
3775 | ||
3776 | if (ra->own) | |
3777 | dsl_dataset_disown(ds, ha->dstg); | |
3778 | else | |
3779 | dsl_dataset_rele(ds, ha->dstg); | |
3780 | ||
3781 | kmem_free(ra, sizeof (struct dsl_ds_releasearg)); | |
3782 | } | |
3783 | ||
3784 | if (error) | |
3785 | (void) strcpy(dsname, ha->failed); | |
3786 | ||
3787 | dsl_sync_task_group_destroy(ha->dstg); | |
3788 | kmem_free(ha, sizeof (struct dsl_ds_holdarg)); | |
3789 | spa_close(spa, FTAG); | |
3790 | return (error); | |
3791 | } | |
3792 | ||
3793 | int | |
3794 | dsl_dataset_get_holds(const char *dsname, nvlist_t **nvp) | |
3795 | { | |
3796 | dsl_dataset_t *ds; | |
3797 | int err; | |
3798 | ||
3799 | err = dsl_dataset_hold(dsname, FTAG, &ds); | |
3800 | if (err) | |
3801 | return (err); | |
3802 | ||
3803 | VERIFY(0 == nvlist_alloc(nvp, NV_UNIQUE_NAME, KM_SLEEP)); | |
3804 | if (ds->ds_phys->ds_userrefs_obj != 0) { | |
3805 | zap_attribute_t *za; | |
3806 | zap_cursor_t zc; | |
3807 | ||
3808 | za = kmem_alloc(sizeof (zap_attribute_t), KM_SLEEP); | |
3809 | for (zap_cursor_init(&zc, ds->ds_dir->dd_pool->dp_meta_objset, | |
3810 | ds->ds_phys->ds_userrefs_obj); | |
3811 | zap_cursor_retrieve(&zc, za) == 0; | |
3812 | zap_cursor_advance(&zc)) { | |
3813 | VERIFY(0 == nvlist_add_uint64(*nvp, za->za_name, | |
3814 | za->za_first_integer)); | |
3815 | } | |
3816 | zap_cursor_fini(&zc); | |
3817 | kmem_free(za, sizeof (zap_attribute_t)); | |
3818 | } | |
3819 | dsl_dataset_rele(ds, FTAG); | |
3820 | return (0); | |
3821 | } |