]>
Commit | Line | Data |
---|---|---|
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 | /* | |
22 | * Copyright 2008 Sun Microsystems, Inc. All rights reserved. | |
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 BB |
41 | #include <sys/sunddi.h> |
42 | ||
b128c09f BB |
43 | static char *dsl_reaper = "the grim reaper"; |
44 | ||
34dc7c2f BB |
45 | static dsl_checkfunc_t dsl_dataset_destroy_begin_check; |
46 | static dsl_syncfunc_t dsl_dataset_destroy_begin_sync; | |
47 | static dsl_checkfunc_t dsl_dataset_rollback_check; | |
48 | static dsl_syncfunc_t dsl_dataset_rollback_sync; | |
49 | static dsl_syncfunc_t dsl_dataset_set_reservation_sync; | |
50 | ||
51 | #define DS_REF_MAX (1ULL << 62) | |
52 | ||
53 | #define DSL_DEADLIST_BLOCKSIZE SPA_MAXBLOCKSIZE | |
54 | ||
b128c09f BB |
55 | #define DSL_DATASET_IS_DESTROYED(ds) ((ds)->ds_owner == dsl_reaper) |
56 | ||
34dc7c2f BB |
57 | |
58 | /* | |
59 | * Figure out how much of this delta should be propogated to the dsl_dir | |
60 | * layer. If there's a refreservation, that space has already been | |
61 | * partially accounted for in our ancestors. | |
62 | */ | |
63 | static int64_t | |
64 | parent_delta(dsl_dataset_t *ds, int64_t delta) | |
65 | { | |
66 | uint64_t old_bytes, new_bytes; | |
67 | ||
68 | if (ds->ds_reserved == 0) | |
69 | return (delta); | |
70 | ||
71 | old_bytes = MAX(ds->ds_phys->ds_unique_bytes, ds->ds_reserved); | |
72 | new_bytes = MAX(ds->ds_phys->ds_unique_bytes + delta, ds->ds_reserved); | |
73 | ||
74 | ASSERT3U(ABS((int64_t)(new_bytes - old_bytes)), <=, ABS(delta)); | |
75 | return (new_bytes - old_bytes); | |
76 | } | |
77 | ||
78 | void | |
79 | dsl_dataset_block_born(dsl_dataset_t *ds, blkptr_t *bp, dmu_tx_t *tx) | |
80 | { | |
81 | int used = bp_get_dasize(tx->tx_pool->dp_spa, bp); | |
82 | int compressed = BP_GET_PSIZE(bp); | |
83 | int uncompressed = BP_GET_UCSIZE(bp); | |
84 | int64_t delta; | |
85 | ||
86 | dprintf_bp(bp, "born, ds=%p\n", ds); | |
87 | ||
88 | ASSERT(dmu_tx_is_syncing(tx)); | |
89 | /* It could have been compressed away to nothing */ | |
90 | if (BP_IS_HOLE(bp)) | |
91 | return; | |
92 | ASSERT(BP_GET_TYPE(bp) != DMU_OT_NONE); | |
93 | ASSERT3U(BP_GET_TYPE(bp), <, DMU_OT_NUMTYPES); | |
94 | if (ds == NULL) { | |
95 | /* | |
96 | * Account for the meta-objset space in its placeholder | |
97 | * dsl_dir. | |
98 | */ | |
99 | ASSERT3U(compressed, ==, uncompressed); /* it's all metadata */ | |
b128c09f | 100 | dsl_dir_diduse_space(tx->tx_pool->dp_mos_dir, DD_USED_HEAD, |
34dc7c2f BB |
101 | used, compressed, uncompressed, tx); |
102 | dsl_dir_dirty(tx->tx_pool->dp_mos_dir, tx); | |
103 | return; | |
104 | } | |
105 | dmu_buf_will_dirty(ds->ds_dbuf, tx); | |
b128c09f | 106 | mutex_enter(&ds->ds_dir->dd_lock); |
34dc7c2f BB |
107 | mutex_enter(&ds->ds_lock); |
108 | delta = parent_delta(ds, used); | |
109 | ds->ds_phys->ds_used_bytes += used; | |
110 | ds->ds_phys->ds_compressed_bytes += compressed; | |
111 | ds->ds_phys->ds_uncompressed_bytes += uncompressed; | |
112 | ds->ds_phys->ds_unique_bytes += used; | |
113 | mutex_exit(&ds->ds_lock); | |
b128c09f BB |
114 | dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD, delta, |
115 | compressed, uncompressed, tx); | |
116 | dsl_dir_transfer_space(ds->ds_dir, used - delta, | |
117 | DD_USED_REFRSRV, DD_USED_HEAD, tx); | |
118 | mutex_exit(&ds->ds_dir->dd_lock); | |
34dc7c2f BB |
119 | } |
120 | ||
b128c09f | 121 | int |
34dc7c2f BB |
122 | dsl_dataset_block_kill(dsl_dataset_t *ds, blkptr_t *bp, zio_t *pio, |
123 | dmu_tx_t *tx) | |
124 | { | |
125 | int used = bp_get_dasize(tx->tx_pool->dp_spa, bp); | |
126 | int compressed = BP_GET_PSIZE(bp); | |
127 | int uncompressed = BP_GET_UCSIZE(bp); | |
128 | ||
b128c09f | 129 | ASSERT(pio != NULL); |
34dc7c2f BB |
130 | ASSERT(dmu_tx_is_syncing(tx)); |
131 | /* No block pointer => nothing to free */ | |
132 | if (BP_IS_HOLE(bp)) | |
b128c09f | 133 | return (0); |
34dc7c2f BB |
134 | |
135 | ASSERT(used > 0); | |
136 | if (ds == NULL) { | |
137 | int err; | |
138 | /* | |
139 | * Account for the meta-objset space in its placeholder | |
140 | * dataset. | |
141 | */ | |
b128c09f BB |
142 | err = dsl_free(pio, tx->tx_pool, |
143 | tx->tx_txg, bp, NULL, NULL, ARC_NOWAIT); | |
34dc7c2f BB |
144 | ASSERT(err == 0); |
145 | ||
b128c09f | 146 | dsl_dir_diduse_space(tx->tx_pool->dp_mos_dir, DD_USED_HEAD, |
34dc7c2f BB |
147 | -used, -compressed, -uncompressed, tx); |
148 | dsl_dir_dirty(tx->tx_pool->dp_mos_dir, tx); | |
b128c09f | 149 | return (used); |
34dc7c2f BB |
150 | } |
151 | ASSERT3P(tx->tx_pool, ==, ds->ds_dir->dd_pool); | |
152 | ||
b128c09f | 153 | ASSERT(!dsl_dataset_is_snapshot(ds)); |
34dc7c2f BB |
154 | dmu_buf_will_dirty(ds->ds_dbuf, tx); |
155 | ||
156 | if (bp->blk_birth > ds->ds_phys->ds_prev_snap_txg) { | |
157 | int err; | |
158 | int64_t delta; | |
159 | ||
160 | dprintf_bp(bp, "freeing: %s", ""); | |
b128c09f BB |
161 | err = dsl_free(pio, tx->tx_pool, |
162 | tx->tx_txg, bp, NULL, NULL, ARC_NOWAIT); | |
34dc7c2f BB |
163 | ASSERT(err == 0); |
164 | ||
b128c09f | 165 | mutex_enter(&ds->ds_dir->dd_lock); |
34dc7c2f BB |
166 | mutex_enter(&ds->ds_lock); |
167 | ASSERT(ds->ds_phys->ds_unique_bytes >= used || | |
168 | !DS_UNIQUE_IS_ACCURATE(ds)); | |
169 | delta = parent_delta(ds, -used); | |
170 | ds->ds_phys->ds_unique_bytes -= used; | |
171 | mutex_exit(&ds->ds_lock); | |
b128c09f | 172 | dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD, |
34dc7c2f | 173 | delta, -compressed, -uncompressed, tx); |
b128c09f BB |
174 | dsl_dir_transfer_space(ds->ds_dir, -used - delta, |
175 | DD_USED_REFRSRV, DD_USED_HEAD, tx); | |
176 | mutex_exit(&ds->ds_dir->dd_lock); | |
34dc7c2f BB |
177 | } else { |
178 | dprintf_bp(bp, "putting on dead list: %s", ""); | |
179 | VERIFY(0 == bplist_enqueue(&ds->ds_deadlist, bp, tx)); | |
180 | ASSERT3U(ds->ds_prev->ds_object, ==, | |
181 | ds->ds_phys->ds_prev_snap_obj); | |
182 | ASSERT(ds->ds_prev->ds_phys->ds_num_children > 0); | |
183 | /* if (bp->blk_birth > prev prev snap txg) prev unique += bs */ | |
184 | if (ds->ds_prev->ds_phys->ds_next_snap_obj == | |
185 | ds->ds_object && bp->blk_birth > | |
186 | ds->ds_prev->ds_phys->ds_prev_snap_txg) { | |
187 | dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); | |
188 | mutex_enter(&ds->ds_prev->ds_lock); | |
189 | ds->ds_prev->ds_phys->ds_unique_bytes += used; | |
190 | mutex_exit(&ds->ds_prev->ds_lock); | |
191 | } | |
b128c09f BB |
192 | if (bp->blk_birth > ds->ds_origin_txg) { |
193 | dsl_dir_transfer_space(ds->ds_dir, used, | |
194 | DD_USED_HEAD, DD_USED_SNAP, tx); | |
195 | } | |
34dc7c2f BB |
196 | } |
197 | mutex_enter(&ds->ds_lock); | |
198 | ASSERT3U(ds->ds_phys->ds_used_bytes, >=, used); | |
199 | ds->ds_phys->ds_used_bytes -= used; | |
200 | ASSERT3U(ds->ds_phys->ds_compressed_bytes, >=, compressed); | |
201 | ds->ds_phys->ds_compressed_bytes -= compressed; | |
202 | ASSERT3U(ds->ds_phys->ds_uncompressed_bytes, >=, uncompressed); | |
203 | ds->ds_phys->ds_uncompressed_bytes -= uncompressed; | |
204 | mutex_exit(&ds->ds_lock); | |
b128c09f BB |
205 | |
206 | return (used); | |
34dc7c2f BB |
207 | } |
208 | ||
209 | uint64_t | |
210 | dsl_dataset_prev_snap_txg(dsl_dataset_t *ds) | |
211 | { | |
212 | uint64_t trysnap = 0; | |
213 | ||
214 | if (ds == NULL) | |
215 | return (0); | |
216 | /* | |
217 | * The snapshot creation could fail, but that would cause an | |
218 | * incorrect FALSE return, which would only result in an | |
219 | * overestimation of the amount of space that an operation would | |
220 | * consume, which is OK. | |
221 | * | |
222 | * There's also a small window where we could miss a pending | |
223 | * snapshot, because we could set the sync task in the quiescing | |
224 | * phase. So this should only be used as a guess. | |
225 | */ | |
226 | if (ds->ds_trysnap_txg > | |
227 | spa_last_synced_txg(ds->ds_dir->dd_pool->dp_spa)) | |
228 | trysnap = ds->ds_trysnap_txg; | |
229 | return (MAX(ds->ds_phys->ds_prev_snap_txg, trysnap)); | |
230 | } | |
231 | ||
232 | int | |
233 | dsl_dataset_block_freeable(dsl_dataset_t *ds, uint64_t blk_birth) | |
234 | { | |
235 | return (blk_birth > dsl_dataset_prev_snap_txg(ds)); | |
236 | } | |
237 | ||
238 | /* ARGSUSED */ | |
239 | static void | |
240 | dsl_dataset_evict(dmu_buf_t *db, void *dsv) | |
241 | { | |
242 | dsl_dataset_t *ds = dsv; | |
243 | ||
b128c09f | 244 | ASSERT(ds->ds_owner == NULL || DSL_DATASET_IS_DESTROYED(ds)); |
34dc7c2f BB |
245 | |
246 | dprintf_ds(ds, "evicting %s\n", ""); | |
247 | ||
248 | unique_remove(ds->ds_fsid_guid); | |
249 | ||
250 | if (ds->ds_user_ptr != NULL) | |
251 | ds->ds_user_evict_func(ds, ds->ds_user_ptr); | |
252 | ||
253 | if (ds->ds_prev) { | |
b128c09f | 254 | dsl_dataset_drop_ref(ds->ds_prev, ds); |
34dc7c2f BB |
255 | ds->ds_prev = NULL; |
256 | } | |
257 | ||
258 | bplist_close(&ds->ds_deadlist); | |
b128c09f BB |
259 | if (ds->ds_dir) |
260 | dsl_dir_close(ds->ds_dir, ds); | |
34dc7c2f BB |
261 | |
262 | ASSERT(!list_link_active(&ds->ds_synced_link)); | |
263 | ||
264 | mutex_destroy(&ds->ds_lock); | |
265 | mutex_destroy(&ds->ds_opening_lock); | |
266 | mutex_destroy(&ds->ds_deadlist.bpl_lock); | |
b128c09f BB |
267 | rw_destroy(&ds->ds_rwlock); |
268 | cv_destroy(&ds->ds_exclusive_cv); | |
34dc7c2f BB |
269 | |
270 | kmem_free(ds, sizeof (dsl_dataset_t)); | |
271 | } | |
272 | ||
273 | static int | |
274 | dsl_dataset_get_snapname(dsl_dataset_t *ds) | |
275 | { | |
276 | dsl_dataset_phys_t *headphys; | |
277 | int err; | |
278 | dmu_buf_t *headdbuf; | |
279 | dsl_pool_t *dp = ds->ds_dir->dd_pool; | |
280 | objset_t *mos = dp->dp_meta_objset; | |
281 | ||
282 | if (ds->ds_snapname[0]) | |
283 | return (0); | |
284 | if (ds->ds_phys->ds_next_snap_obj == 0) | |
285 | return (0); | |
286 | ||
287 | err = dmu_bonus_hold(mos, ds->ds_dir->dd_phys->dd_head_dataset_obj, | |
288 | FTAG, &headdbuf); | |
289 | if (err) | |
290 | return (err); | |
291 | headphys = headdbuf->db_data; | |
292 | err = zap_value_search(dp->dp_meta_objset, | |
293 | headphys->ds_snapnames_zapobj, ds->ds_object, 0, ds->ds_snapname); | |
294 | dmu_buf_rele(headdbuf, FTAG); | |
295 | return (err); | |
296 | } | |
297 | ||
298 | static int | |
b128c09f | 299 | dsl_dataset_snap_lookup(dsl_dataset_t *ds, const char *name, uint64_t *value) |
34dc7c2f | 300 | { |
b128c09f BB |
301 | objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; |
302 | uint64_t snapobj = ds->ds_phys->ds_snapnames_zapobj; | |
34dc7c2f BB |
303 | matchtype_t mt; |
304 | int err; | |
305 | ||
b128c09f | 306 | if (ds->ds_phys->ds_flags & DS_FLAG_CI_DATASET) |
34dc7c2f BB |
307 | mt = MT_FIRST; |
308 | else | |
309 | mt = MT_EXACT; | |
310 | ||
b128c09f | 311 | err = zap_lookup_norm(mos, snapobj, name, 8, 1, |
34dc7c2f BB |
312 | value, mt, NULL, 0, NULL); |
313 | if (err == ENOTSUP && mt == MT_FIRST) | |
b128c09f | 314 | err = zap_lookup(mos, snapobj, name, 8, 1, value); |
34dc7c2f BB |
315 | return (err); |
316 | } | |
317 | ||
318 | static int | |
b128c09f | 319 | dsl_dataset_snap_remove(dsl_dataset_t *ds, char *name, dmu_tx_t *tx) |
34dc7c2f | 320 | { |
b128c09f BB |
321 | objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; |
322 | uint64_t snapobj = ds->ds_phys->ds_snapnames_zapobj; | |
34dc7c2f BB |
323 | matchtype_t mt; |
324 | int err; | |
325 | ||
b128c09f | 326 | if (ds->ds_phys->ds_flags & DS_FLAG_CI_DATASET) |
34dc7c2f BB |
327 | mt = MT_FIRST; |
328 | else | |
329 | mt = MT_EXACT; | |
330 | ||
b128c09f | 331 | err = zap_remove_norm(mos, snapobj, name, mt, tx); |
34dc7c2f | 332 | if (err == ENOTSUP && mt == MT_FIRST) |
b128c09f | 333 | err = zap_remove(mos, snapobj, name, tx); |
34dc7c2f BB |
334 | return (err); |
335 | } | |
336 | ||
b128c09f BB |
337 | static int |
338 | dsl_dataset_get_ref(dsl_pool_t *dp, uint64_t dsobj, void *tag, | |
339 | dsl_dataset_t **dsp) | |
34dc7c2f | 340 | { |
34dc7c2f BB |
341 | objset_t *mos = dp->dp_meta_objset; |
342 | dmu_buf_t *dbuf; | |
343 | dsl_dataset_t *ds; | |
344 | int err; | |
345 | ||
346 | ASSERT(RW_LOCK_HELD(&dp->dp_config_rwlock) || | |
347 | dsl_pool_sync_context(dp)); | |
348 | ||
349 | err = dmu_bonus_hold(mos, dsobj, tag, &dbuf); | |
350 | if (err) | |
351 | return (err); | |
352 | ds = dmu_buf_get_user(dbuf); | |
353 | if (ds == NULL) { | |
354 | dsl_dataset_t *winner; | |
355 | ||
356 | ds = kmem_zalloc(sizeof (dsl_dataset_t), KM_SLEEP); | |
357 | ds->ds_dbuf = dbuf; | |
358 | ds->ds_object = dsobj; | |
359 | ds->ds_phys = dbuf->db_data; | |
360 | ||
361 | mutex_init(&ds->ds_lock, NULL, MUTEX_DEFAULT, NULL); | |
362 | mutex_init(&ds->ds_opening_lock, NULL, MUTEX_DEFAULT, NULL); | |
363 | mutex_init(&ds->ds_deadlist.bpl_lock, NULL, MUTEX_DEFAULT, | |
364 | NULL); | |
b128c09f BB |
365 | rw_init(&ds->ds_rwlock, 0, 0, 0); |
366 | cv_init(&ds->ds_exclusive_cv, NULL, CV_DEFAULT, NULL); | |
34dc7c2f BB |
367 | |
368 | err = bplist_open(&ds->ds_deadlist, | |
369 | mos, ds->ds_phys->ds_deadlist_obj); | |
370 | if (err == 0) { | |
371 | err = dsl_dir_open_obj(dp, | |
372 | ds->ds_phys->ds_dir_obj, NULL, ds, &ds->ds_dir); | |
373 | } | |
374 | if (err) { | |
375 | /* | |
376 | * we don't really need to close the blist if we | |
377 | * just opened it. | |
378 | */ | |
379 | mutex_destroy(&ds->ds_lock); | |
380 | mutex_destroy(&ds->ds_opening_lock); | |
381 | mutex_destroy(&ds->ds_deadlist.bpl_lock); | |
b128c09f BB |
382 | rw_destroy(&ds->ds_rwlock); |
383 | cv_destroy(&ds->ds_exclusive_cv); | |
34dc7c2f BB |
384 | kmem_free(ds, sizeof (dsl_dataset_t)); |
385 | dmu_buf_rele(dbuf, tag); | |
386 | return (err); | |
387 | } | |
388 | ||
b128c09f | 389 | if (!dsl_dataset_is_snapshot(ds)) { |
34dc7c2f BB |
390 | ds->ds_snapname[0] = '\0'; |
391 | if (ds->ds_phys->ds_prev_snap_obj) { | |
b128c09f BB |
392 | err = dsl_dataset_get_ref(dp, |
393 | ds->ds_phys->ds_prev_snap_obj, | |
394 | ds, &ds->ds_prev); | |
34dc7c2f | 395 | } |
b128c09f BB |
396 | |
397 | if (err == 0 && dsl_dir_is_clone(ds->ds_dir)) { | |
398 | dsl_dataset_t *origin; | |
399 | ||
400 | err = dsl_dataset_hold_obj(dp, | |
401 | ds->ds_dir->dd_phys->dd_origin_obj, | |
402 | FTAG, &origin); | |
34dc7c2f | 403 | if (err == 0) { |
b128c09f BB |
404 | ds->ds_origin_txg = |
405 | origin->ds_phys->ds_creation_txg; | |
406 | dsl_dataset_rele(origin, FTAG); | |
34dc7c2f | 407 | } |
34dc7c2f | 408 | } |
b128c09f BB |
409 | } else if (zfs_flags & ZFS_DEBUG_SNAPNAMES) { |
410 | err = dsl_dataset_get_snapname(ds); | |
34dc7c2f BB |
411 | } |
412 | ||
b128c09f | 413 | if (err == 0 && !dsl_dataset_is_snapshot(ds)) { |
34dc7c2f BB |
414 | /* |
415 | * In sync context, we're called with either no lock | |
416 | * or with the write lock. If we're not syncing, | |
417 | * we're always called with the read lock held. | |
418 | */ | |
419 | boolean_t need_lock = | |
420 | !RW_WRITE_HELD(&dp->dp_config_rwlock) && | |
421 | dsl_pool_sync_context(dp); | |
422 | ||
423 | if (need_lock) | |
424 | rw_enter(&dp->dp_config_rwlock, RW_READER); | |
425 | ||
b128c09f | 426 | err = dsl_prop_get_ds(ds, |
34dc7c2f BB |
427 | "refreservation", sizeof (uint64_t), 1, |
428 | &ds->ds_reserved, NULL); | |
429 | if (err == 0) { | |
b128c09f | 430 | err = dsl_prop_get_ds(ds, |
34dc7c2f BB |
431 | "refquota", sizeof (uint64_t), 1, |
432 | &ds->ds_quota, NULL); | |
433 | } | |
434 | ||
435 | if (need_lock) | |
436 | rw_exit(&dp->dp_config_rwlock); | |
437 | } else { | |
438 | ds->ds_reserved = ds->ds_quota = 0; | |
439 | } | |
440 | ||
441 | if (err == 0) { | |
442 | winner = dmu_buf_set_user_ie(dbuf, ds, &ds->ds_phys, | |
443 | dsl_dataset_evict); | |
444 | } | |
445 | if (err || winner) { | |
446 | bplist_close(&ds->ds_deadlist); | |
b128c09f BB |
447 | if (ds->ds_prev) |
448 | dsl_dataset_drop_ref(ds->ds_prev, ds); | |
34dc7c2f BB |
449 | dsl_dir_close(ds->ds_dir, ds); |
450 | mutex_destroy(&ds->ds_lock); | |
451 | mutex_destroy(&ds->ds_opening_lock); | |
452 | mutex_destroy(&ds->ds_deadlist.bpl_lock); | |
b128c09f BB |
453 | rw_destroy(&ds->ds_rwlock); |
454 | cv_destroy(&ds->ds_exclusive_cv); | |
34dc7c2f BB |
455 | kmem_free(ds, sizeof (dsl_dataset_t)); |
456 | if (err) { | |
457 | dmu_buf_rele(dbuf, tag); | |
458 | return (err); | |
459 | } | |
460 | ds = winner; | |
461 | } else { | |
462 | ds->ds_fsid_guid = | |
463 | unique_insert(ds->ds_phys->ds_fsid_guid); | |
464 | } | |
465 | } | |
466 | ASSERT3P(ds->ds_dbuf, ==, dbuf); | |
467 | ASSERT3P(ds->ds_phys, ==, dbuf->db_data); | |
b128c09f BB |
468 | ASSERT(ds->ds_phys->ds_prev_snap_obj != 0 || |
469 | spa_version(dp->dp_spa) < SPA_VERSION_ORIGIN || | |
470 | dp->dp_origin_snap == NULL || ds == dp->dp_origin_snap); | |
34dc7c2f | 471 | mutex_enter(&ds->ds_lock); |
b128c09f | 472 | if (!dsl_pool_sync_context(dp) && DSL_DATASET_IS_DESTROYED(ds)) { |
34dc7c2f | 473 | mutex_exit(&ds->ds_lock); |
b128c09f BB |
474 | dmu_buf_rele(ds->ds_dbuf, tag); |
475 | return (ENOENT); | |
34dc7c2f | 476 | } |
34dc7c2f | 477 | mutex_exit(&ds->ds_lock); |
34dc7c2f BB |
478 | *dsp = ds; |
479 | return (0); | |
480 | } | |
481 | ||
b128c09f BB |
482 | static int |
483 | dsl_dataset_hold_ref(dsl_dataset_t *ds, void *tag) | |
484 | { | |
485 | dsl_pool_t *dp = ds->ds_dir->dd_pool; | |
486 | ||
487 | /* | |
488 | * In syncing context we don't want the rwlock lock: there | |
489 | * may be an existing writer waiting for sync phase to | |
490 | * finish. We don't need to worry about such writers, since | |
491 | * sync phase is single-threaded, so the writer can't be | |
492 | * doing anything while we are active. | |
493 | */ | |
494 | if (dsl_pool_sync_context(dp)) { | |
495 | ASSERT(!DSL_DATASET_IS_DESTROYED(ds)); | |
496 | return (0); | |
497 | } | |
498 | ||
499 | /* | |
500 | * Normal users will hold the ds_rwlock as a READER until they | |
501 | * are finished (i.e., call dsl_dataset_rele()). "Owners" will | |
502 | * drop their READER lock after they set the ds_owner field. | |
503 | * | |
504 | * If the dataset is being destroyed, the destroy thread will | |
505 | * obtain a WRITER lock for exclusive access after it's done its | |
506 | * open-context work and then change the ds_owner to | |
507 | * dsl_reaper once destruction is assured. So threads | |
508 | * may block here temporarily, until the "destructability" of | |
509 | * the dataset is determined. | |
510 | */ | |
511 | ASSERT(!RW_WRITE_HELD(&dp->dp_config_rwlock)); | |
512 | mutex_enter(&ds->ds_lock); | |
513 | while (!rw_tryenter(&ds->ds_rwlock, RW_READER)) { | |
514 | rw_exit(&dp->dp_config_rwlock); | |
515 | cv_wait(&ds->ds_exclusive_cv, &ds->ds_lock); | |
516 | if (DSL_DATASET_IS_DESTROYED(ds)) { | |
517 | mutex_exit(&ds->ds_lock); | |
518 | dsl_dataset_drop_ref(ds, tag); | |
519 | rw_enter(&dp->dp_config_rwlock, RW_READER); | |
520 | return (ENOENT); | |
521 | } | |
522 | rw_enter(&dp->dp_config_rwlock, RW_READER); | |
523 | } | |
524 | mutex_exit(&ds->ds_lock); | |
525 | return (0); | |
526 | } | |
527 | ||
34dc7c2f | 528 | int |
b128c09f BB |
529 | dsl_dataset_hold_obj(dsl_pool_t *dp, uint64_t dsobj, void *tag, |
530 | dsl_dataset_t **dsp) | |
531 | { | |
532 | int err = dsl_dataset_get_ref(dp, dsobj, tag, dsp); | |
533 | ||
534 | if (err) | |
535 | return (err); | |
536 | return (dsl_dataset_hold_ref(*dsp, tag)); | |
537 | } | |
538 | ||
539 | int | |
540 | dsl_dataset_own_obj(dsl_pool_t *dp, uint64_t dsobj, int flags, void *owner, | |
541 | dsl_dataset_t **dsp) | |
542 | { | |
543 | int err = dsl_dataset_hold_obj(dp, dsobj, owner, dsp); | |
544 | ||
545 | ASSERT(DS_MODE_TYPE(flags) != DS_MODE_USER); | |
546 | ||
547 | if (err) | |
548 | return (err); | |
549 | if (!dsl_dataset_tryown(*dsp, DS_MODE_IS_INCONSISTENT(flags), owner)) { | |
550 | dsl_dataset_rele(*dsp, owner); | |
551 | return (EBUSY); | |
552 | } | |
553 | return (0); | |
554 | } | |
555 | ||
556 | int | |
557 | dsl_dataset_hold(const char *name, void *tag, dsl_dataset_t **dsp) | |
34dc7c2f BB |
558 | { |
559 | dsl_dir_t *dd; | |
560 | dsl_pool_t *dp; | |
b128c09f | 561 | const char *snapname; |
34dc7c2f | 562 | uint64_t obj; |
34dc7c2f BB |
563 | int err = 0; |
564 | ||
b128c09f | 565 | err = dsl_dir_open_spa(NULL, name, FTAG, &dd, &snapname); |
34dc7c2f BB |
566 | if (err) |
567 | return (err); | |
568 | ||
569 | dp = dd->dd_pool; | |
570 | obj = dd->dd_phys->dd_head_dataset_obj; | |
571 | rw_enter(&dp->dp_config_rwlock, RW_READER); | |
b128c09f BB |
572 | if (obj) |
573 | err = dsl_dataset_get_ref(dp, obj, tag, dsp); | |
574 | else | |
34dc7c2f | 575 | err = ENOENT; |
b128c09f | 576 | if (err) |
34dc7c2f | 577 | goto out; |
34dc7c2f | 578 | |
b128c09f | 579 | err = dsl_dataset_hold_ref(*dsp, tag); |
34dc7c2f | 580 | |
b128c09f BB |
581 | /* we may be looking for a snapshot */ |
582 | if (err == 0 && snapname != NULL) { | |
583 | dsl_dataset_t *ds = NULL; | |
34dc7c2f | 584 | |
b128c09f BB |
585 | if (*snapname++ != '@') { |
586 | dsl_dataset_rele(*dsp, tag); | |
34dc7c2f BB |
587 | err = ENOENT; |
588 | goto out; | |
589 | } | |
34dc7c2f | 590 | |
b128c09f BB |
591 | dprintf("looking for snapshot '%s'\n", snapname); |
592 | err = dsl_dataset_snap_lookup(*dsp, snapname, &obj); | |
593 | if (err == 0) | |
594 | err = dsl_dataset_get_ref(dp, obj, tag, &ds); | |
595 | dsl_dataset_rele(*dsp, tag); | |
596 | ||
597 | ASSERT3U((err == 0), ==, (ds != NULL)); | |
598 | ||
599 | if (ds) { | |
600 | mutex_enter(&ds->ds_lock); | |
601 | if (ds->ds_snapname[0] == 0) | |
602 | (void) strlcpy(ds->ds_snapname, snapname, | |
603 | sizeof (ds->ds_snapname)); | |
604 | mutex_exit(&ds->ds_lock); | |
605 | err = dsl_dataset_hold_ref(ds, tag); | |
606 | *dsp = err ? NULL : ds; | |
34dc7c2f | 607 | } |
34dc7c2f | 608 | } |
34dc7c2f BB |
609 | out: |
610 | rw_exit(&dp->dp_config_rwlock); | |
611 | dsl_dir_close(dd, FTAG); | |
34dc7c2f BB |
612 | return (err); |
613 | } | |
614 | ||
615 | int | |
b128c09f | 616 | dsl_dataset_own(const char *name, int flags, void *owner, dsl_dataset_t **dsp) |
34dc7c2f | 617 | { |
b128c09f BB |
618 | int err = dsl_dataset_hold(name, owner, dsp); |
619 | if (err) | |
620 | return (err); | |
621 | if ((*dsp)->ds_phys->ds_num_children > 0 && | |
622 | !DS_MODE_IS_READONLY(flags)) { | |
623 | dsl_dataset_rele(*dsp, owner); | |
624 | return (EROFS); | |
625 | } | |
626 | if (!dsl_dataset_tryown(*dsp, DS_MODE_IS_INCONSISTENT(flags), owner)) { | |
627 | dsl_dataset_rele(*dsp, owner); | |
628 | return (EBUSY); | |
629 | } | |
630 | return (0); | |
34dc7c2f BB |
631 | } |
632 | ||
633 | void | |
634 | dsl_dataset_name(dsl_dataset_t *ds, char *name) | |
635 | { | |
636 | if (ds == NULL) { | |
637 | (void) strcpy(name, "mos"); | |
638 | } else { | |
639 | dsl_dir_name(ds->ds_dir, name); | |
640 | VERIFY(0 == dsl_dataset_get_snapname(ds)); | |
641 | if (ds->ds_snapname[0]) { | |
642 | (void) strcat(name, "@"); | |
b128c09f BB |
643 | /* |
644 | * We use a "recursive" mutex so that we | |
645 | * can call dprintf_ds() with ds_lock held. | |
646 | */ | |
34dc7c2f | 647 | if (!MUTEX_HELD(&ds->ds_lock)) { |
34dc7c2f BB |
648 | mutex_enter(&ds->ds_lock); |
649 | (void) strcat(name, ds->ds_snapname); | |
650 | mutex_exit(&ds->ds_lock); | |
651 | } else { | |
652 | (void) strcat(name, ds->ds_snapname); | |
653 | } | |
654 | } | |
655 | } | |
656 | } | |
657 | ||
658 | static int | |
659 | dsl_dataset_namelen(dsl_dataset_t *ds) | |
660 | { | |
661 | int result; | |
662 | ||
663 | if (ds == NULL) { | |
664 | result = 3; /* "mos" */ | |
665 | } else { | |
666 | result = dsl_dir_namelen(ds->ds_dir); | |
667 | VERIFY(0 == dsl_dataset_get_snapname(ds)); | |
668 | if (ds->ds_snapname[0]) { | |
669 | ++result; /* adding one for the @-sign */ | |
670 | if (!MUTEX_HELD(&ds->ds_lock)) { | |
34dc7c2f BB |
671 | mutex_enter(&ds->ds_lock); |
672 | result += strlen(ds->ds_snapname); | |
673 | mutex_exit(&ds->ds_lock); | |
674 | } else { | |
675 | result += strlen(ds->ds_snapname); | |
676 | } | |
677 | } | |
678 | } | |
679 | ||
680 | return (result); | |
681 | } | |
682 | ||
683 | void | |
b128c09f | 684 | dsl_dataset_drop_ref(dsl_dataset_t *ds, void *tag) |
34dc7c2f | 685 | { |
34dc7c2f BB |
686 | dmu_buf_rele(ds->ds_dbuf, tag); |
687 | } | |
688 | ||
689 | void | |
b128c09f BB |
690 | dsl_dataset_rele(dsl_dataset_t *ds, void *tag) |
691 | { | |
692 | if (!dsl_pool_sync_context(ds->ds_dir->dd_pool)) { | |
693 | rw_exit(&ds->ds_rwlock); | |
694 | } | |
695 | dsl_dataset_drop_ref(ds, tag); | |
696 | } | |
697 | ||
698 | void | |
699 | dsl_dataset_disown(dsl_dataset_t *ds, void *owner) | |
34dc7c2f | 700 | { |
b128c09f BB |
701 | ASSERT((ds->ds_owner == owner && ds->ds_dbuf) || |
702 | (DSL_DATASET_IS_DESTROYED(ds) && ds->ds_dbuf == NULL)); | |
703 | ||
34dc7c2f | 704 | mutex_enter(&ds->ds_lock); |
b128c09f BB |
705 | ds->ds_owner = NULL; |
706 | if (RW_WRITE_HELD(&ds->ds_rwlock)) { | |
707 | rw_exit(&ds->ds_rwlock); | |
708 | cv_broadcast(&ds->ds_exclusive_cv); | |
709 | } | |
34dc7c2f | 710 | mutex_exit(&ds->ds_lock); |
b128c09f BB |
711 | if (ds->ds_dbuf) |
712 | dsl_dataset_drop_ref(ds, owner); | |
713 | else | |
714 | dsl_dataset_evict(ds->ds_dbuf, ds); | |
34dc7c2f BB |
715 | } |
716 | ||
717 | boolean_t | |
b128c09f | 718 | dsl_dataset_tryown(dsl_dataset_t *ds, boolean_t inconsistentok, void *owner) |
34dc7c2f | 719 | { |
b128c09f BB |
720 | boolean_t gotit = FALSE; |
721 | ||
34dc7c2f | 722 | mutex_enter(&ds->ds_lock); |
b128c09f BB |
723 | if (ds->ds_owner == NULL && |
724 | (!DS_IS_INCONSISTENT(ds) || inconsistentok)) { | |
725 | ds->ds_owner = owner; | |
726 | if (!dsl_pool_sync_context(ds->ds_dir->dd_pool)) | |
727 | rw_exit(&ds->ds_rwlock); | |
728 | gotit = TRUE; | |
34dc7c2f BB |
729 | } |
730 | mutex_exit(&ds->ds_lock); | |
b128c09f | 731 | return (gotit); |
34dc7c2f BB |
732 | } |
733 | ||
734 | void | |
b128c09f | 735 | dsl_dataset_make_exclusive(dsl_dataset_t *ds, void *owner) |
34dc7c2f | 736 | { |
b128c09f BB |
737 | ASSERT3P(owner, ==, ds->ds_owner); |
738 | if (!RW_WRITE_HELD(&ds->ds_rwlock)) | |
739 | rw_enter(&ds->ds_rwlock, RW_WRITER); | |
34dc7c2f BB |
740 | } |
741 | ||
742 | uint64_t | |
b128c09f | 743 | dsl_dataset_create_sync_dd(dsl_dir_t *dd, dsl_dataset_t *origin, |
34dc7c2f BB |
744 | uint64_t flags, dmu_tx_t *tx) |
745 | { | |
746 | dsl_pool_t *dp = dd->dd_pool; | |
747 | dmu_buf_t *dbuf; | |
748 | dsl_dataset_phys_t *dsphys; | |
749 | uint64_t dsobj; | |
750 | objset_t *mos = dp->dp_meta_objset; | |
751 | ||
b128c09f BB |
752 | if (origin == NULL) |
753 | origin = dp->dp_origin_snap; | |
754 | ||
34dc7c2f BB |
755 | ASSERT(origin == NULL || origin->ds_dir->dd_pool == dp); |
756 | ASSERT(origin == NULL || origin->ds_phys->ds_num_children > 0); | |
757 | ASSERT(dmu_tx_is_syncing(tx)); | |
758 | ASSERT(dd->dd_phys->dd_head_dataset_obj == 0); | |
759 | ||
760 | dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, | |
761 | DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); | |
762 | VERIFY(0 == dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); | |
763 | dmu_buf_will_dirty(dbuf, tx); | |
764 | dsphys = dbuf->db_data; | |
b128c09f | 765 | bzero(dsphys, sizeof (dsl_dataset_phys_t)); |
34dc7c2f BB |
766 | dsphys->ds_dir_obj = dd->dd_object; |
767 | dsphys->ds_flags = flags; | |
768 | dsphys->ds_fsid_guid = unique_create(); | |
769 | (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, | |
770 | sizeof (dsphys->ds_guid)); | |
771 | dsphys->ds_snapnames_zapobj = | |
772 | zap_create_norm(mos, U8_TEXTPREP_TOUPPER, DMU_OT_DSL_DS_SNAP_MAP, | |
773 | DMU_OT_NONE, 0, tx); | |
774 | dsphys->ds_creation_time = gethrestime_sec(); | |
b128c09f | 775 | dsphys->ds_creation_txg = tx->tx_txg == TXG_INITIAL ? 1 : tx->tx_txg; |
34dc7c2f BB |
776 | dsphys->ds_deadlist_obj = |
777 | bplist_create(mos, DSL_DEADLIST_BLOCKSIZE, tx); | |
778 | ||
779 | if (origin) { | |
780 | dsphys->ds_prev_snap_obj = origin->ds_object; | |
781 | dsphys->ds_prev_snap_txg = | |
782 | origin->ds_phys->ds_creation_txg; | |
783 | dsphys->ds_used_bytes = | |
784 | origin->ds_phys->ds_used_bytes; | |
785 | dsphys->ds_compressed_bytes = | |
786 | origin->ds_phys->ds_compressed_bytes; | |
787 | dsphys->ds_uncompressed_bytes = | |
788 | origin->ds_phys->ds_uncompressed_bytes; | |
789 | dsphys->ds_bp = origin->ds_phys->ds_bp; | |
790 | dsphys->ds_flags |= origin->ds_phys->ds_flags; | |
791 | ||
792 | dmu_buf_will_dirty(origin->ds_dbuf, tx); | |
793 | origin->ds_phys->ds_num_children++; | |
794 | ||
b128c09f BB |
795 | if (spa_version(dp->dp_spa) >= SPA_VERSION_NEXT_CLONES) { |
796 | if (origin->ds_phys->ds_next_clones_obj == 0) { | |
797 | origin->ds_phys->ds_next_clones_obj = | |
798 | zap_create(mos, | |
799 | DMU_OT_NEXT_CLONES, DMU_OT_NONE, 0, tx); | |
800 | } | |
801 | VERIFY(0 == zap_add_int(mos, | |
802 | origin->ds_phys->ds_next_clones_obj, | |
803 | dsobj, tx)); | |
804 | } | |
805 | ||
34dc7c2f BB |
806 | dmu_buf_will_dirty(dd->dd_dbuf, tx); |
807 | dd->dd_phys->dd_origin_obj = origin->ds_object; | |
808 | } | |
809 | ||
810 | if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE) | |
811 | dsphys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; | |
812 | ||
813 | dmu_buf_rele(dbuf, FTAG); | |
814 | ||
815 | dmu_buf_will_dirty(dd->dd_dbuf, tx); | |
816 | dd->dd_phys->dd_head_dataset_obj = dsobj; | |
817 | ||
818 | return (dsobj); | |
819 | } | |
820 | ||
821 | uint64_t | |
822 | dsl_dataset_create_sync(dsl_dir_t *pdd, const char *lastname, | |
823 | dsl_dataset_t *origin, uint64_t flags, cred_t *cr, dmu_tx_t *tx) | |
824 | { | |
825 | dsl_pool_t *dp = pdd->dd_pool; | |
826 | uint64_t dsobj, ddobj; | |
827 | dsl_dir_t *dd; | |
828 | ||
829 | ASSERT(lastname[0] != '@'); | |
830 | ||
b128c09f | 831 | ddobj = dsl_dir_create_sync(dp, pdd, lastname, tx); |
34dc7c2f BB |
832 | VERIFY(0 == dsl_dir_open_obj(dp, ddobj, lastname, FTAG, &dd)); |
833 | ||
b128c09f | 834 | dsobj = dsl_dataset_create_sync_dd(dd, origin, flags, tx); |
34dc7c2f BB |
835 | |
836 | dsl_deleg_set_create_perms(dd, tx, cr); | |
837 | ||
838 | dsl_dir_close(dd, FTAG); | |
839 | ||
840 | return (dsobj); | |
841 | } | |
842 | ||
843 | struct destroyarg { | |
844 | dsl_sync_task_group_t *dstg; | |
845 | char *snapname; | |
846 | char *failed; | |
847 | }; | |
848 | ||
849 | static int | |
850 | dsl_snapshot_destroy_one(char *name, void *arg) | |
851 | { | |
852 | struct destroyarg *da = arg; | |
853 | dsl_dataset_t *ds; | |
854 | char *cp; | |
855 | int err; | |
856 | ||
857 | (void) strcat(name, "@"); | |
858 | (void) strcat(name, da->snapname); | |
b128c09f | 859 | err = dsl_dataset_own(name, DS_MODE_READONLY | DS_MODE_INCONSISTENT, |
34dc7c2f BB |
860 | da->dstg, &ds); |
861 | cp = strchr(name, '@'); | |
862 | *cp = '\0'; | |
b128c09f BB |
863 | if (err == 0) { |
864 | dsl_dataset_make_exclusive(ds, da->dstg); | |
865 | if (ds->ds_user_ptr) { | |
866 | ds->ds_user_evict_func(ds, ds->ds_user_ptr); | |
867 | ds->ds_user_ptr = NULL; | |
868 | } | |
869 | dsl_sync_task_create(da->dstg, dsl_dataset_destroy_check, | |
870 | dsl_dataset_destroy_sync, ds, da->dstg, 0); | |
871 | } else if (err == ENOENT) { | |
872 | err = 0; | |
873 | } else { | |
34dc7c2f | 874 | (void) strcpy(da->failed, name); |
34dc7c2f | 875 | } |
b128c09f | 876 | return (err); |
34dc7c2f BB |
877 | } |
878 | ||
879 | /* | |
880 | * Destroy 'snapname' in all descendants of 'fsname'. | |
881 | */ | |
882 | #pragma weak dmu_snapshots_destroy = dsl_snapshots_destroy | |
883 | int | |
884 | dsl_snapshots_destroy(char *fsname, char *snapname) | |
885 | { | |
886 | int err; | |
887 | struct destroyarg da; | |
888 | dsl_sync_task_t *dst; | |
889 | spa_t *spa; | |
890 | ||
891 | err = spa_open(fsname, &spa, FTAG); | |
892 | if (err) | |
893 | return (err); | |
894 | da.dstg = dsl_sync_task_group_create(spa_get_dsl(spa)); | |
895 | da.snapname = snapname; | |
896 | da.failed = fsname; | |
897 | ||
898 | err = dmu_objset_find(fsname, | |
899 | dsl_snapshot_destroy_one, &da, DS_FIND_CHILDREN); | |
900 | ||
901 | if (err == 0) | |
902 | err = dsl_sync_task_group_wait(da.dstg); | |
903 | ||
904 | for (dst = list_head(&da.dstg->dstg_tasks); dst; | |
905 | dst = list_next(&da.dstg->dstg_tasks, dst)) { | |
906 | dsl_dataset_t *ds = dst->dst_arg1; | |
b128c09f BB |
907 | /* |
908 | * Return the file system name that triggered the error | |
909 | */ | |
34dc7c2f BB |
910 | if (dst->dst_err) { |
911 | dsl_dataset_name(ds, fsname); | |
912 | *strchr(fsname, '@') = '\0'; | |
913 | } | |
b128c09f | 914 | dsl_dataset_disown(ds, da.dstg); |
34dc7c2f BB |
915 | } |
916 | ||
917 | dsl_sync_task_group_destroy(da.dstg); | |
918 | spa_close(spa, FTAG); | |
919 | return (err); | |
920 | } | |
921 | ||
922 | /* | |
b128c09f BB |
923 | * ds must be opened as OWNER. On return (whether successful or not), |
924 | * ds will be closed and caller can no longer dereference it. | |
34dc7c2f BB |
925 | */ |
926 | int | |
927 | dsl_dataset_destroy(dsl_dataset_t *ds, void *tag) | |
928 | { | |
929 | int err; | |
930 | dsl_sync_task_group_t *dstg; | |
931 | objset_t *os; | |
932 | dsl_dir_t *dd; | |
933 | uint64_t obj; | |
934 | ||
34dc7c2f BB |
935 | if (dsl_dataset_is_snapshot(ds)) { |
936 | /* Destroying a snapshot is simpler */ | |
b128c09f BB |
937 | dsl_dataset_make_exclusive(ds, tag); |
938 | ||
939 | if (ds->ds_user_ptr) { | |
940 | ds->ds_user_evict_func(ds, ds->ds_user_ptr); | |
941 | ds->ds_user_ptr = NULL; | |
942 | } | |
34dc7c2f BB |
943 | err = dsl_sync_task_do(ds->ds_dir->dd_pool, |
944 | dsl_dataset_destroy_check, dsl_dataset_destroy_sync, | |
945 | ds, tag, 0); | |
946 | goto out; | |
947 | } | |
948 | ||
949 | dd = ds->ds_dir; | |
950 | ||
951 | /* | |
952 | * Check for errors and mark this ds as inconsistent, in | |
953 | * case we crash while freeing the objects. | |
954 | */ | |
955 | err = dsl_sync_task_do(dd->dd_pool, dsl_dataset_destroy_begin_check, | |
956 | dsl_dataset_destroy_begin_sync, ds, NULL, 0); | |
957 | if (err) | |
958 | goto out; | |
959 | ||
960 | err = dmu_objset_open_ds(ds, DMU_OST_ANY, &os); | |
961 | if (err) | |
962 | goto out; | |
963 | ||
964 | /* | |
965 | * remove the objects in open context, so that we won't | |
966 | * have too much to do in syncing context. | |
967 | */ | |
968 | for (obj = 0; err == 0; err = dmu_object_next(os, &obj, FALSE, | |
969 | ds->ds_phys->ds_prev_snap_txg)) { | |
b128c09f BB |
970 | /* |
971 | * Ignore errors, if there is not enough disk space | |
972 | * we will deal with it in dsl_dataset_destroy_sync(). | |
973 | */ | |
974 | (void) dmu_free_object(os, obj); | |
34dc7c2f | 975 | } |
34dc7c2f BB |
976 | |
977 | dmu_objset_close(os); | |
978 | if (err != ESRCH) | |
979 | goto out; | |
980 | ||
34dc7c2f BB |
981 | rw_enter(&dd->dd_pool->dp_config_rwlock, RW_READER); |
982 | err = dsl_dir_open_obj(dd->dd_pool, dd->dd_object, NULL, FTAG, &dd); | |
983 | rw_exit(&dd->dd_pool->dp_config_rwlock); | |
984 | ||
985 | if (err) | |
986 | goto out; | |
987 | ||
b128c09f BB |
988 | if (ds->ds_user_ptr) { |
989 | /* | |
990 | * We need to sync out all in-flight IO before we try | |
991 | * to evict (the dataset evict func is trying to clear | |
992 | * the cached entries for this dataset in the ARC). | |
993 | */ | |
994 | txg_wait_synced(dd->dd_pool, 0); | |
995 | } | |
996 | ||
34dc7c2f BB |
997 | /* |
998 | * Blow away the dsl_dir + head dataset. | |
999 | */ | |
b128c09f BB |
1000 | dsl_dataset_make_exclusive(ds, tag); |
1001 | if (ds->ds_user_ptr) { | |
1002 | ds->ds_user_evict_func(ds, ds->ds_user_ptr); | |
1003 | ds->ds_user_ptr = NULL; | |
1004 | } | |
34dc7c2f BB |
1005 | dstg = dsl_sync_task_group_create(ds->ds_dir->dd_pool); |
1006 | dsl_sync_task_create(dstg, dsl_dataset_destroy_check, | |
1007 | dsl_dataset_destroy_sync, ds, tag, 0); | |
1008 | dsl_sync_task_create(dstg, dsl_dir_destroy_check, | |
1009 | dsl_dir_destroy_sync, dd, FTAG, 0); | |
1010 | err = dsl_sync_task_group_wait(dstg); | |
1011 | dsl_sync_task_group_destroy(dstg); | |
b128c09f | 1012 | /* if it is successful, dsl_dir_destroy_sync will close the dd */ |
34dc7c2f BB |
1013 | if (err) |
1014 | dsl_dir_close(dd, FTAG); | |
1015 | out: | |
b128c09f | 1016 | dsl_dataset_disown(ds, tag); |
34dc7c2f BB |
1017 | return (err); |
1018 | } | |
1019 | ||
1020 | int | |
1021 | dsl_dataset_rollback(dsl_dataset_t *ds, dmu_objset_type_t ost) | |
1022 | { | |
b128c09f BB |
1023 | int err; |
1024 | ||
1025 | ASSERT(ds->ds_owner); | |
34dc7c2f | 1026 | |
b128c09f BB |
1027 | dsl_dataset_make_exclusive(ds, ds->ds_owner); |
1028 | err = dsl_sync_task_do(ds->ds_dir->dd_pool, | |
34dc7c2f | 1029 | dsl_dataset_rollback_check, dsl_dataset_rollback_sync, |
b128c09f BB |
1030 | ds, &ost, 0); |
1031 | /* drop exclusive access */ | |
1032 | mutex_enter(&ds->ds_lock); | |
1033 | rw_exit(&ds->ds_rwlock); | |
1034 | cv_broadcast(&ds->ds_exclusive_cv); | |
1035 | mutex_exit(&ds->ds_lock); | |
1036 | return (err); | |
34dc7c2f BB |
1037 | } |
1038 | ||
1039 | void * | |
1040 | dsl_dataset_set_user_ptr(dsl_dataset_t *ds, | |
1041 | void *p, dsl_dataset_evict_func_t func) | |
1042 | { | |
1043 | void *old; | |
1044 | ||
1045 | mutex_enter(&ds->ds_lock); | |
1046 | old = ds->ds_user_ptr; | |
1047 | if (old == NULL) { | |
1048 | ds->ds_user_ptr = p; | |
1049 | ds->ds_user_evict_func = func; | |
1050 | } | |
1051 | mutex_exit(&ds->ds_lock); | |
1052 | return (old); | |
1053 | } | |
1054 | ||
1055 | void * | |
1056 | dsl_dataset_get_user_ptr(dsl_dataset_t *ds) | |
1057 | { | |
1058 | return (ds->ds_user_ptr); | |
1059 | } | |
1060 | ||
1061 | ||
1062 | blkptr_t * | |
1063 | dsl_dataset_get_blkptr(dsl_dataset_t *ds) | |
1064 | { | |
1065 | return (&ds->ds_phys->ds_bp); | |
1066 | } | |
1067 | ||
1068 | void | |
1069 | dsl_dataset_set_blkptr(dsl_dataset_t *ds, blkptr_t *bp, dmu_tx_t *tx) | |
1070 | { | |
1071 | ASSERT(dmu_tx_is_syncing(tx)); | |
1072 | /* If it's the meta-objset, set dp_meta_rootbp */ | |
1073 | if (ds == NULL) { | |
1074 | tx->tx_pool->dp_meta_rootbp = *bp; | |
1075 | } else { | |
1076 | dmu_buf_will_dirty(ds->ds_dbuf, tx); | |
1077 | ds->ds_phys->ds_bp = *bp; | |
1078 | } | |
1079 | } | |
1080 | ||
1081 | spa_t * | |
1082 | dsl_dataset_get_spa(dsl_dataset_t *ds) | |
1083 | { | |
1084 | return (ds->ds_dir->dd_pool->dp_spa); | |
1085 | } | |
1086 | ||
1087 | void | |
1088 | dsl_dataset_dirty(dsl_dataset_t *ds, dmu_tx_t *tx) | |
1089 | { | |
1090 | dsl_pool_t *dp; | |
1091 | ||
1092 | if (ds == NULL) /* this is the meta-objset */ | |
1093 | return; | |
1094 | ||
1095 | ASSERT(ds->ds_user_ptr != NULL); | |
1096 | ||
1097 | if (ds->ds_phys->ds_next_snap_obj != 0) | |
1098 | panic("dirtying snapshot!"); | |
1099 | ||
1100 | dp = ds->ds_dir->dd_pool; | |
1101 | ||
1102 | if (txg_list_add(&dp->dp_dirty_datasets, ds, tx->tx_txg) == 0) { | |
1103 | /* up the hold count until we can be written out */ | |
1104 | dmu_buf_add_ref(ds->ds_dbuf, ds); | |
1105 | } | |
1106 | } | |
1107 | ||
1108 | /* | |
1109 | * The unique space in the head dataset can be calculated by subtracting | |
1110 | * the space used in the most recent snapshot, that is still being used | |
1111 | * in this file system, from the space currently in use. To figure out | |
1112 | * the space in the most recent snapshot still in use, we need to take | |
1113 | * the total space used in the snapshot and subtract out the space that | |
1114 | * has been freed up since the snapshot was taken. | |
1115 | */ | |
1116 | static void | |
1117 | dsl_dataset_recalc_head_uniq(dsl_dataset_t *ds) | |
1118 | { | |
1119 | uint64_t mrs_used; | |
1120 | uint64_t dlused, dlcomp, dluncomp; | |
1121 | ||
1122 | ASSERT(ds->ds_object == ds->ds_dir->dd_phys->dd_head_dataset_obj); | |
1123 | ||
1124 | if (ds->ds_phys->ds_prev_snap_obj != 0) | |
1125 | mrs_used = ds->ds_prev->ds_phys->ds_used_bytes; | |
1126 | else | |
1127 | mrs_used = 0; | |
1128 | ||
1129 | VERIFY(0 == bplist_space(&ds->ds_deadlist, &dlused, &dlcomp, | |
1130 | &dluncomp)); | |
1131 | ||
1132 | ASSERT3U(dlused, <=, mrs_used); | |
1133 | ds->ds_phys->ds_unique_bytes = | |
1134 | ds->ds_phys->ds_used_bytes - (mrs_used - dlused); | |
1135 | ||
1136 | if (!DS_UNIQUE_IS_ACCURATE(ds) && | |
1137 | spa_version(ds->ds_dir->dd_pool->dp_spa) >= | |
1138 | SPA_VERSION_UNIQUE_ACCURATE) | |
1139 | ds->ds_phys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; | |
1140 | } | |
1141 | ||
1142 | static uint64_t | |
1143 | dsl_dataset_unique(dsl_dataset_t *ds) | |
1144 | { | |
1145 | if (!DS_UNIQUE_IS_ACCURATE(ds) && !dsl_dataset_is_snapshot(ds)) | |
1146 | dsl_dataset_recalc_head_uniq(ds); | |
1147 | ||
1148 | return (ds->ds_phys->ds_unique_bytes); | |
1149 | } | |
1150 | ||
1151 | struct killarg { | |
b128c09f | 1152 | dsl_dataset_t *ds; |
34dc7c2f BB |
1153 | zio_t *zio; |
1154 | dmu_tx_t *tx; | |
1155 | }; | |
1156 | ||
b128c09f | 1157 | /* ARGSUSED */ |
34dc7c2f | 1158 | static int |
b128c09f BB |
1159 | kill_blkptr(spa_t *spa, blkptr_t *bp, const zbookmark_t *zb, |
1160 | const dnode_phys_t *dnp, void *arg) | |
34dc7c2f BB |
1161 | { |
1162 | struct killarg *ka = arg; | |
34dc7c2f | 1163 | |
b128c09f BB |
1164 | if (bp == NULL) |
1165 | return (0); | |
1166 | ||
1167 | ASSERT3U(bp->blk_birth, >, ka->ds->ds_phys->ds_prev_snap_txg); | |
1168 | (void) dsl_dataset_block_kill(ka->ds, bp, ka->zio, ka->tx); | |
34dc7c2f | 1169 | |
34dc7c2f BB |
1170 | return (0); |
1171 | } | |
1172 | ||
1173 | /* ARGSUSED */ | |
1174 | static int | |
1175 | dsl_dataset_rollback_check(void *arg1, void *arg2, dmu_tx_t *tx) | |
1176 | { | |
1177 | dsl_dataset_t *ds = arg1; | |
1178 | dmu_objset_type_t *ost = arg2; | |
1179 | ||
1180 | /* | |
1181 | * We can only roll back to emptyness if it is a ZPL objset. | |
1182 | */ | |
1183 | if (*ost != DMU_OST_ZFS && ds->ds_phys->ds_prev_snap_txg == 0) | |
1184 | return (EINVAL); | |
1185 | ||
1186 | /* | |
1187 | * This must not be a snapshot. | |
1188 | */ | |
1189 | if (ds->ds_phys->ds_next_snap_obj != 0) | |
1190 | return (EINVAL); | |
1191 | ||
1192 | /* | |
b128c09f | 1193 | * If we made changes this txg, traverse_dataset won't find |
34dc7c2f BB |
1194 | * them. Try again. |
1195 | */ | |
1196 | if (ds->ds_phys->ds_bp.blk_birth >= tx->tx_txg) | |
1197 | return (EAGAIN); | |
1198 | ||
1199 | return (0); | |
1200 | } | |
1201 | ||
1202 | /* ARGSUSED */ | |
1203 | static void | |
1204 | dsl_dataset_rollback_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) | |
1205 | { | |
1206 | dsl_dataset_t *ds = arg1; | |
1207 | dmu_objset_type_t *ost = arg2; | |
1208 | objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; | |
1209 | ||
1210 | dmu_buf_will_dirty(ds->ds_dbuf, tx); | |
1211 | ||
1212 | /* | |
1213 | * Before the roll back destroy the zil. | |
1214 | */ | |
1215 | if (ds->ds_user_ptr != NULL) { | |
1216 | zil_rollback_destroy( | |
1217 | ((objset_impl_t *)ds->ds_user_ptr)->os_zil, tx); | |
1218 | ||
1219 | /* | |
1220 | * We need to make sure that the objset_impl_t is reopened after | |
1221 | * we do the rollback, otherwise it will have the wrong | |
1222 | * objset_phys_t. Normally this would happen when this | |
b128c09f | 1223 | * dataset-open is closed, thus causing the |
34dc7c2f BB |
1224 | * dataset to be immediately evicted. But when doing "zfs recv |
1225 | * -F", we reopen the objset before that, so that there is no | |
1226 | * window where the dataset is closed and inconsistent. | |
1227 | */ | |
1228 | ds->ds_user_evict_func(ds, ds->ds_user_ptr); | |
1229 | ds->ds_user_ptr = NULL; | |
1230 | } | |
1231 | ||
b128c09f BB |
1232 | /* Transfer space that was freed since last snap back to the head. */ |
1233 | { | |
1234 | uint64_t used; | |
1235 | ||
1236 | VERIFY(0 == bplist_space_birthrange(&ds->ds_deadlist, | |
1237 | ds->ds_origin_txg, UINT64_MAX, &used)); | |
1238 | dsl_dir_transfer_space(ds->ds_dir, used, | |
1239 | DD_USED_SNAP, DD_USED_HEAD, tx); | |
1240 | } | |
1241 | ||
34dc7c2f BB |
1242 | /* Zero out the deadlist. */ |
1243 | bplist_close(&ds->ds_deadlist); | |
1244 | bplist_destroy(mos, ds->ds_phys->ds_deadlist_obj, tx); | |
1245 | ds->ds_phys->ds_deadlist_obj = | |
1246 | bplist_create(mos, DSL_DEADLIST_BLOCKSIZE, tx); | |
1247 | VERIFY(0 == bplist_open(&ds->ds_deadlist, mos, | |
1248 | ds->ds_phys->ds_deadlist_obj)); | |
1249 | ||
1250 | { | |
1251 | /* Free blkptrs that we gave birth to */ | |
1252 | zio_t *zio; | |
34dc7c2f | 1253 | struct killarg ka; |
34dc7c2f BB |
1254 | |
1255 | zio = zio_root(tx->tx_pool->dp_spa, NULL, NULL, | |
1256 | ZIO_FLAG_MUSTSUCCEED); | |
b128c09f | 1257 | ka.ds = ds; |
34dc7c2f BB |
1258 | ka.zio = zio; |
1259 | ka.tx = tx; | |
b128c09f BB |
1260 | (void) traverse_dataset(ds, ds->ds_phys->ds_prev_snap_txg, |
1261 | TRAVERSE_POST, kill_blkptr, &ka); | |
34dc7c2f | 1262 | (void) zio_wait(zio); |
34dc7c2f BB |
1263 | } |
1264 | ||
b128c09f BB |
1265 | ASSERT(!(ds->ds_phys->ds_flags & DS_FLAG_UNIQUE_ACCURATE) || |
1266 | ds->ds_phys->ds_unique_bytes == 0); | |
1267 | ||
1268 | if (ds->ds_prev && ds->ds_prev != ds->ds_dir->dd_pool->dp_origin_snap) { | |
34dc7c2f | 1269 | /* Change our contents to that of the prev snapshot */ |
b128c09f | 1270 | |
34dc7c2f BB |
1271 | ASSERT3U(ds->ds_prev->ds_object, ==, |
1272 | ds->ds_phys->ds_prev_snap_obj); | |
b128c09f BB |
1273 | ASSERT3U(ds->ds_phys->ds_used_bytes, <=, |
1274 | ds->ds_prev->ds_phys->ds_used_bytes); | |
1275 | ||
34dc7c2f BB |
1276 | ds->ds_phys->ds_bp = ds->ds_prev->ds_phys->ds_bp; |
1277 | ds->ds_phys->ds_used_bytes = | |
1278 | ds->ds_prev->ds_phys->ds_used_bytes; | |
1279 | ds->ds_phys->ds_compressed_bytes = | |
1280 | ds->ds_prev->ds_phys->ds_compressed_bytes; | |
1281 | ds->ds_phys->ds_uncompressed_bytes = | |
1282 | ds->ds_prev->ds_phys->ds_uncompressed_bytes; | |
1283 | ds->ds_phys->ds_flags = ds->ds_prev->ds_phys->ds_flags; | |
34dc7c2f BB |
1284 | |
1285 | if (ds->ds_prev->ds_phys->ds_next_snap_obj == ds->ds_object) { | |
1286 | dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); | |
1287 | ds->ds_prev->ds_phys->ds_unique_bytes = 0; | |
1288 | } | |
1289 | } else { | |
b128c09f BB |
1290 | objset_impl_t *osi; |
1291 | ||
1292 | ASSERT3U(ds->ds_phys->ds_used_bytes, ==, 0); | |
1293 | ASSERT3U(ds->ds_phys->ds_compressed_bytes, ==, 0); | |
1294 | ASSERT3U(ds->ds_phys->ds_uncompressed_bytes, ==, 0); | |
1295 | ||
34dc7c2f | 1296 | bzero(&ds->ds_phys->ds_bp, sizeof (blkptr_t)); |
34dc7c2f BB |
1297 | ds->ds_phys->ds_flags = 0; |
1298 | ds->ds_phys->ds_unique_bytes = 0; | |
b128c09f BB |
1299 | if (spa_version(ds->ds_dir->dd_pool->dp_spa) >= |
1300 | SPA_VERSION_UNIQUE_ACCURATE) | |
1301 | ds->ds_phys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; | |
1302 | ||
1303 | osi = dmu_objset_create_impl(ds->ds_dir->dd_pool->dp_spa, ds, | |
34dc7c2f | 1304 | &ds->ds_phys->ds_bp, *ost, tx); |
b128c09f BB |
1305 | #ifdef _KERNEL |
1306 | zfs_create_fs(&osi->os, kcred, NULL, tx); | |
1307 | #endif | |
34dc7c2f BB |
1308 | } |
1309 | ||
1310 | spa_history_internal_log(LOG_DS_ROLLBACK, ds->ds_dir->dd_pool->dp_spa, | |
1311 | tx, cr, "dataset = %llu", ds->ds_object); | |
1312 | } | |
1313 | ||
1314 | /* ARGSUSED */ | |
1315 | static int | |
1316 | dsl_dataset_destroy_begin_check(void *arg1, void *arg2, dmu_tx_t *tx) | |
1317 | { | |
1318 | dsl_dataset_t *ds = arg1; | |
1319 | objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; | |
1320 | uint64_t count; | |
1321 | int err; | |
1322 | ||
1323 | /* | |
1324 | * Can't delete a head dataset if there are snapshots of it. | |
1325 | * (Except if the only snapshots are from the branch we cloned | |
1326 | * from.) | |
1327 | */ | |
1328 | if (ds->ds_prev != NULL && | |
1329 | ds->ds_prev->ds_phys->ds_next_snap_obj == ds->ds_object) | |
1330 | return (EINVAL); | |
1331 | ||
1332 | /* | |
1333 | * This is really a dsl_dir thing, but check it here so that | |
1334 | * we'll be less likely to leave this dataset inconsistent & | |
1335 | * nearly destroyed. | |
1336 | */ | |
1337 | err = zap_count(mos, ds->ds_dir->dd_phys->dd_child_dir_zapobj, &count); | |
1338 | if (err) | |
1339 | return (err); | |
1340 | if (count != 0) | |
1341 | return (EEXIST); | |
1342 | ||
1343 | return (0); | |
1344 | } | |
1345 | ||
1346 | /* ARGSUSED */ | |
1347 | static void | |
1348 | dsl_dataset_destroy_begin_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) | |
1349 | { | |
1350 | dsl_dataset_t *ds = arg1; | |
1351 | dsl_pool_t *dp = ds->ds_dir->dd_pool; | |
1352 | ||
1353 | /* Mark it as inconsistent on-disk, in case we crash */ | |
1354 | dmu_buf_will_dirty(ds->ds_dbuf, tx); | |
1355 | ds->ds_phys->ds_flags |= DS_FLAG_INCONSISTENT; | |
1356 | ||
1357 | spa_history_internal_log(LOG_DS_DESTROY_BEGIN, dp->dp_spa, tx, | |
1358 | cr, "dataset = %llu", ds->ds_object); | |
1359 | } | |
1360 | ||
1361 | /* ARGSUSED */ | |
1362 | int | |
1363 | dsl_dataset_destroy_check(void *arg1, void *arg2, dmu_tx_t *tx) | |
1364 | { | |
1365 | dsl_dataset_t *ds = arg1; | |
1366 | ||
b128c09f BB |
1367 | /* we have an owner hold, so noone else can destroy us */ |
1368 | ASSERT(!DSL_DATASET_IS_DESTROYED(ds)); | |
1369 | ||
34dc7c2f BB |
1370 | /* Can't delete a branch point. */ |
1371 | if (ds->ds_phys->ds_num_children > 1) | |
1372 | return (EEXIST); | |
1373 | ||
1374 | /* | |
1375 | * Can't delete a head dataset if there are snapshots of it. | |
1376 | * (Except if the only snapshots are from the branch we cloned | |
1377 | * from.) | |
1378 | */ | |
1379 | if (ds->ds_prev != NULL && | |
1380 | ds->ds_prev->ds_phys->ds_next_snap_obj == ds->ds_object) | |
1381 | return (EINVAL); | |
1382 | ||
1383 | /* | |
1384 | * If we made changes this txg, traverse_dsl_dataset won't find | |
1385 | * them. Try again. | |
1386 | */ | |
1387 | if (ds->ds_phys->ds_bp.blk_birth >= tx->tx_txg) | |
1388 | return (EAGAIN); | |
1389 | ||
1390 | /* XXX we should do some i/o error checking... */ | |
1391 | return (0); | |
1392 | } | |
1393 | ||
b128c09f BB |
1394 | struct refsarg { |
1395 | kmutex_t lock; | |
1396 | boolean_t gone; | |
1397 | kcondvar_t cv; | |
1398 | }; | |
1399 | ||
1400 | /* ARGSUSED */ | |
1401 | static void | |
1402 | dsl_dataset_refs_gone(dmu_buf_t *db, void *argv) | |
1403 | { | |
1404 | struct refsarg *arg = argv; | |
1405 | ||
1406 | mutex_enter(&arg->lock); | |
1407 | arg->gone = TRUE; | |
1408 | cv_signal(&arg->cv); | |
1409 | mutex_exit(&arg->lock); | |
1410 | } | |
1411 | ||
1412 | static void | |
1413 | dsl_dataset_drain_refs(dsl_dataset_t *ds, void *tag) | |
1414 | { | |
1415 | struct refsarg arg; | |
1416 | ||
1417 | mutex_init(&arg.lock, NULL, MUTEX_DEFAULT, NULL); | |
1418 | cv_init(&arg.cv, NULL, CV_DEFAULT, NULL); | |
1419 | arg.gone = FALSE; | |
1420 | (void) dmu_buf_update_user(ds->ds_dbuf, ds, &arg, &ds->ds_phys, | |
1421 | dsl_dataset_refs_gone); | |
1422 | dmu_buf_rele(ds->ds_dbuf, tag); | |
1423 | mutex_enter(&arg.lock); | |
1424 | while (!arg.gone) | |
1425 | cv_wait(&arg.cv, &arg.lock); | |
1426 | ASSERT(arg.gone); | |
1427 | mutex_exit(&arg.lock); | |
1428 | ds->ds_dbuf = NULL; | |
1429 | ds->ds_phys = NULL; | |
1430 | mutex_destroy(&arg.lock); | |
1431 | cv_destroy(&arg.cv); | |
1432 | } | |
1433 | ||
34dc7c2f BB |
1434 | void |
1435 | dsl_dataset_destroy_sync(void *arg1, void *tag, cred_t *cr, dmu_tx_t *tx) | |
1436 | { | |
1437 | dsl_dataset_t *ds = arg1; | |
34dc7c2f BB |
1438 | zio_t *zio; |
1439 | int err; | |
1440 | int after_branch_point = FALSE; | |
1441 | dsl_pool_t *dp = ds->ds_dir->dd_pool; | |
1442 | objset_t *mos = dp->dp_meta_objset; | |
1443 | dsl_dataset_t *ds_prev = NULL; | |
1444 | uint64_t obj; | |
1445 | ||
b128c09f | 1446 | ASSERT(ds->ds_owner); |
34dc7c2f BB |
1447 | ASSERT3U(ds->ds_phys->ds_num_children, <=, 1); |
1448 | ASSERT(ds->ds_prev == NULL || | |
1449 | ds->ds_prev->ds_phys->ds_next_snap_obj != ds->ds_object); | |
1450 | ASSERT3U(ds->ds_phys->ds_bp.blk_birth, <=, tx->tx_txg); | |
1451 | ||
b128c09f BB |
1452 | /* signal any waiters that this dataset is going away */ |
1453 | mutex_enter(&ds->ds_lock); | |
1454 | ds->ds_owner = dsl_reaper; | |
1455 | cv_broadcast(&ds->ds_exclusive_cv); | |
1456 | mutex_exit(&ds->ds_lock); | |
1457 | ||
34dc7c2f BB |
1458 | /* Remove our reservation */ |
1459 | if (ds->ds_reserved != 0) { | |
1460 | uint64_t val = 0; | |
1461 | dsl_dataset_set_reservation_sync(ds, &val, cr, tx); | |
1462 | ASSERT3U(ds->ds_reserved, ==, 0); | |
1463 | } | |
1464 | ||
1465 | ASSERT(RW_WRITE_HELD(&dp->dp_config_rwlock)); | |
1466 | ||
b128c09f BB |
1467 | dsl_pool_ds_destroyed(ds, tx); |
1468 | ||
34dc7c2f BB |
1469 | obj = ds->ds_object; |
1470 | ||
1471 | if (ds->ds_phys->ds_prev_snap_obj != 0) { | |
1472 | if (ds->ds_prev) { | |
1473 | ds_prev = ds->ds_prev; | |
1474 | } else { | |
b128c09f BB |
1475 | VERIFY(0 == dsl_dataset_hold_obj(dp, |
1476 | ds->ds_phys->ds_prev_snap_obj, FTAG, &ds_prev)); | |
34dc7c2f BB |
1477 | } |
1478 | after_branch_point = | |
1479 | (ds_prev->ds_phys->ds_next_snap_obj != obj); | |
1480 | ||
1481 | dmu_buf_will_dirty(ds_prev->ds_dbuf, tx); | |
b128c09f BB |
1482 | if (after_branch_point && |
1483 | ds_prev->ds_phys->ds_next_clones_obj != 0) { | |
1484 | VERIFY(0 == zap_remove_int(mos, | |
1485 | ds_prev->ds_phys->ds_next_clones_obj, obj, tx)); | |
1486 | if (ds->ds_phys->ds_next_snap_obj != 0) { | |
1487 | VERIFY(0 == zap_add_int(mos, | |
1488 | ds_prev->ds_phys->ds_next_clones_obj, | |
1489 | ds->ds_phys->ds_next_snap_obj, tx)); | |
1490 | } | |
1491 | } | |
34dc7c2f BB |
1492 | if (after_branch_point && |
1493 | ds->ds_phys->ds_next_snap_obj == 0) { | |
1494 | /* This clone is toast. */ | |
1495 | ASSERT(ds_prev->ds_phys->ds_num_children > 1); | |
1496 | ds_prev->ds_phys->ds_num_children--; | |
1497 | } else if (!after_branch_point) { | |
1498 | ds_prev->ds_phys->ds_next_snap_obj = | |
1499 | ds->ds_phys->ds_next_snap_obj; | |
1500 | } | |
1501 | } | |
1502 | ||
1503 | zio = zio_root(dp->dp_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED); | |
1504 | ||
1505 | if (ds->ds_phys->ds_next_snap_obj != 0) { | |
1506 | blkptr_t bp; | |
1507 | dsl_dataset_t *ds_next; | |
1508 | uint64_t itor = 0; | |
1509 | uint64_t old_unique; | |
b128c09f | 1510 | int64_t used = 0, compressed = 0, uncompressed = 0; |
34dc7c2f | 1511 | |
b128c09f BB |
1512 | VERIFY(0 == dsl_dataset_hold_obj(dp, |
1513 | ds->ds_phys->ds_next_snap_obj, FTAG, &ds_next)); | |
34dc7c2f BB |
1514 | ASSERT3U(ds_next->ds_phys->ds_prev_snap_obj, ==, obj); |
1515 | ||
1516 | old_unique = dsl_dataset_unique(ds_next); | |
1517 | ||
1518 | dmu_buf_will_dirty(ds_next->ds_dbuf, tx); | |
1519 | ds_next->ds_phys->ds_prev_snap_obj = | |
1520 | ds->ds_phys->ds_prev_snap_obj; | |
1521 | ds_next->ds_phys->ds_prev_snap_txg = | |
1522 | ds->ds_phys->ds_prev_snap_txg; | |
1523 | ASSERT3U(ds->ds_phys->ds_prev_snap_txg, ==, | |
1524 | ds_prev ? ds_prev->ds_phys->ds_creation_txg : 0); | |
1525 | ||
1526 | /* | |
1527 | * Transfer to our deadlist (which will become next's | |
1528 | * new deadlist) any entries from next's current | |
1529 | * deadlist which were born before prev, and free the | |
1530 | * other entries. | |
1531 | * | |
1532 | * XXX we're doing this long task with the config lock held | |
1533 | */ | |
b128c09f | 1534 | while (bplist_iterate(&ds_next->ds_deadlist, &itor, &bp) == 0) { |
34dc7c2f BB |
1535 | if (bp.blk_birth <= ds->ds_phys->ds_prev_snap_txg) { |
1536 | VERIFY(0 == bplist_enqueue(&ds->ds_deadlist, | |
1537 | &bp, tx)); | |
1538 | if (ds_prev && !after_branch_point && | |
1539 | bp.blk_birth > | |
1540 | ds_prev->ds_phys->ds_prev_snap_txg) { | |
1541 | ds_prev->ds_phys->ds_unique_bytes += | |
1542 | bp_get_dasize(dp->dp_spa, &bp); | |
1543 | } | |
1544 | } else { | |
1545 | used += bp_get_dasize(dp->dp_spa, &bp); | |
1546 | compressed += BP_GET_PSIZE(&bp); | |
1547 | uncompressed += BP_GET_UCSIZE(&bp); | |
1548 | /* XXX check return value? */ | |
b128c09f | 1549 | (void) dsl_free(zio, dp, tx->tx_txg, |
34dc7c2f BB |
1550 | &bp, NULL, NULL, ARC_NOWAIT); |
1551 | } | |
1552 | } | |
1553 | ||
b128c09f BB |
1554 | ASSERT3U(used, ==, ds->ds_phys->ds_unique_bytes); |
1555 | ||
1556 | /* change snapused */ | |
1557 | dsl_dir_diduse_space(ds->ds_dir, DD_USED_SNAP, | |
1558 | -used, -compressed, -uncompressed, tx); | |
1559 | ||
34dc7c2f BB |
1560 | /* free next's deadlist */ |
1561 | bplist_close(&ds_next->ds_deadlist); | |
1562 | bplist_destroy(mos, ds_next->ds_phys->ds_deadlist_obj, tx); | |
1563 | ||
1564 | /* set next's deadlist to our deadlist */ | |
b128c09f | 1565 | bplist_close(&ds->ds_deadlist); |
34dc7c2f BB |
1566 | ds_next->ds_phys->ds_deadlist_obj = |
1567 | ds->ds_phys->ds_deadlist_obj; | |
1568 | VERIFY(0 == bplist_open(&ds_next->ds_deadlist, mos, | |
1569 | ds_next->ds_phys->ds_deadlist_obj)); | |
1570 | ds->ds_phys->ds_deadlist_obj = 0; | |
1571 | ||
1572 | if (ds_next->ds_phys->ds_next_snap_obj != 0) { | |
1573 | /* | |
1574 | * Update next's unique to include blocks which | |
1575 | * were previously shared by only this snapshot | |
1576 | * and it. Those blocks will be born after the | |
1577 | * prev snap and before this snap, and will have | |
1578 | * died after the next snap and before the one | |
1579 | * after that (ie. be on the snap after next's | |
1580 | * deadlist). | |
1581 | * | |
1582 | * XXX we're doing this long task with the | |
1583 | * config lock held | |
1584 | */ | |
1585 | dsl_dataset_t *ds_after_next; | |
b128c09f | 1586 | uint64_t space; |
34dc7c2f | 1587 | |
b128c09f BB |
1588 | VERIFY(0 == dsl_dataset_hold_obj(dp, |
1589 | ds_next->ds_phys->ds_next_snap_obj, | |
1590 | FTAG, &ds_after_next)); | |
34dc7c2f | 1591 | |
b128c09f BB |
1592 | VERIFY(0 == |
1593 | bplist_space_birthrange(&ds_after_next->ds_deadlist, | |
1594 | ds->ds_phys->ds_prev_snap_txg, | |
1595 | ds->ds_phys->ds_creation_txg, &space)); | |
1596 | ds_next->ds_phys->ds_unique_bytes += space; | |
1597 | ||
1598 | dsl_dataset_rele(ds_after_next, FTAG); | |
34dc7c2f BB |
1599 | ASSERT3P(ds_next->ds_prev, ==, NULL); |
1600 | } else { | |
1601 | ASSERT3P(ds_next->ds_prev, ==, ds); | |
b128c09f BB |
1602 | dsl_dataset_drop_ref(ds_next->ds_prev, ds_next); |
1603 | ds_next->ds_prev = NULL; | |
34dc7c2f | 1604 | if (ds_prev) { |
b128c09f BB |
1605 | VERIFY(0 == dsl_dataset_get_ref(dp, |
1606 | ds->ds_phys->ds_prev_snap_obj, | |
1607 | ds_next, &ds_next->ds_prev)); | |
34dc7c2f BB |
1608 | } |
1609 | ||
1610 | dsl_dataset_recalc_head_uniq(ds_next); | |
1611 | ||
1612 | /* | |
1613 | * Reduce the amount of our unconsmed refreservation | |
1614 | * being charged to our parent by the amount of | |
1615 | * new unique data we have gained. | |
1616 | */ | |
1617 | if (old_unique < ds_next->ds_reserved) { | |
1618 | int64_t mrsdelta; | |
1619 | uint64_t new_unique = | |
1620 | ds_next->ds_phys->ds_unique_bytes; | |
1621 | ||
1622 | ASSERT(old_unique <= new_unique); | |
1623 | mrsdelta = MIN(new_unique - old_unique, | |
1624 | ds_next->ds_reserved - old_unique); | |
b128c09f BB |
1625 | dsl_dir_diduse_space(ds->ds_dir, |
1626 | DD_USED_REFRSRV, -mrsdelta, 0, 0, tx); | |
34dc7c2f BB |
1627 | } |
1628 | } | |
b128c09f | 1629 | dsl_dataset_rele(ds_next, FTAG); |
34dc7c2f BB |
1630 | } else { |
1631 | /* | |
1632 | * There's no next snapshot, so this is a head dataset. | |
1633 | * Destroy the deadlist. Unless it's a clone, the | |
1634 | * deadlist should be empty. (If it's a clone, it's | |
1635 | * safe to ignore the deadlist contents.) | |
1636 | */ | |
1637 | struct killarg ka; | |
1638 | ||
1639 | ASSERT(after_branch_point || bplist_empty(&ds->ds_deadlist)); | |
1640 | bplist_close(&ds->ds_deadlist); | |
1641 | bplist_destroy(mos, ds->ds_phys->ds_deadlist_obj, tx); | |
1642 | ds->ds_phys->ds_deadlist_obj = 0; | |
1643 | ||
1644 | /* | |
1645 | * Free everything that we point to (that's born after | |
1646 | * the previous snapshot, if we are a clone) | |
1647 | * | |
b128c09f BB |
1648 | * NB: this should be very quick, because we already |
1649 | * freed all the objects in open context. | |
34dc7c2f | 1650 | */ |
b128c09f | 1651 | ka.ds = ds; |
34dc7c2f BB |
1652 | ka.zio = zio; |
1653 | ka.tx = tx; | |
b128c09f BB |
1654 | err = traverse_dataset(ds, ds->ds_phys->ds_prev_snap_txg, |
1655 | TRAVERSE_POST, kill_blkptr, &ka); | |
34dc7c2f | 1656 | ASSERT3U(err, ==, 0); |
b128c09f BB |
1657 | ASSERT(spa_version(dp->dp_spa) < SPA_VERSION_UNIQUE_ACCURATE || |
1658 | ds->ds_phys->ds_unique_bytes == 0); | |
34dc7c2f BB |
1659 | } |
1660 | ||
1661 | err = zio_wait(zio); | |
1662 | ASSERT3U(err, ==, 0); | |
1663 | ||
34dc7c2f | 1664 | if (ds->ds_dir->dd_phys->dd_head_dataset_obj == ds->ds_object) { |
b128c09f | 1665 | /* Erase the link in the dir */ |
34dc7c2f BB |
1666 | dmu_buf_will_dirty(ds->ds_dir->dd_dbuf, tx); |
1667 | ds->ds_dir->dd_phys->dd_head_dataset_obj = 0; | |
b128c09f BB |
1668 | ASSERT(ds->ds_phys->ds_snapnames_zapobj != 0); |
1669 | err = zap_destroy(mos, ds->ds_phys->ds_snapnames_zapobj, tx); | |
1670 | ASSERT(err == 0); | |
34dc7c2f BB |
1671 | } else { |
1672 | /* remove from snapshot namespace */ | |
1673 | dsl_dataset_t *ds_head; | |
b128c09f BB |
1674 | ASSERT(ds->ds_phys->ds_snapnames_zapobj == 0); |
1675 | VERIFY(0 == dsl_dataset_hold_obj(dp, | |
1676 | ds->ds_dir->dd_phys->dd_head_dataset_obj, FTAG, &ds_head)); | |
34dc7c2f BB |
1677 | VERIFY(0 == dsl_dataset_get_snapname(ds)); |
1678 | #ifdef ZFS_DEBUG | |
1679 | { | |
1680 | uint64_t val; | |
1681 | ||
b128c09f | 1682 | err = dsl_dataset_snap_lookup(ds_head, |
34dc7c2f BB |
1683 | ds->ds_snapname, &val); |
1684 | ASSERT3U(err, ==, 0); | |
1685 | ASSERT3U(val, ==, obj); | |
1686 | } | |
1687 | #endif | |
b128c09f | 1688 | err = dsl_dataset_snap_remove(ds_head, ds->ds_snapname, tx); |
34dc7c2f | 1689 | ASSERT(err == 0); |
b128c09f | 1690 | dsl_dataset_rele(ds_head, FTAG); |
34dc7c2f BB |
1691 | } |
1692 | ||
1693 | if (ds_prev && ds->ds_prev != ds_prev) | |
b128c09f | 1694 | dsl_dataset_rele(ds_prev, FTAG); |
34dc7c2f BB |
1695 | |
1696 | spa_prop_clear_bootfs(dp->dp_spa, ds->ds_object, tx); | |
1697 | spa_history_internal_log(LOG_DS_DESTROY, dp->dp_spa, tx, | |
1698 | cr, "dataset = %llu", ds->ds_object); | |
1699 | ||
b128c09f BB |
1700 | if (ds->ds_phys->ds_next_clones_obj != 0) { |
1701 | uint64_t count; | |
1702 | ASSERT(0 == zap_count(mos, | |
1703 | ds->ds_phys->ds_next_clones_obj, &count) && count == 0); | |
1704 | VERIFY(0 == dmu_object_free(mos, | |
1705 | ds->ds_phys->ds_next_clones_obj, tx)); | |
1706 | } | |
1707 | if (ds->ds_phys->ds_props_obj != 0) | |
1708 | VERIFY(0 == zap_destroy(mos, ds->ds_phys->ds_props_obj, tx)); | |
1709 | dsl_dir_close(ds->ds_dir, ds); | |
1710 | ds->ds_dir = NULL; | |
1711 | dsl_dataset_drain_refs(ds, tag); | |
34dc7c2f | 1712 | VERIFY(0 == dmu_object_free(mos, obj, tx)); |
34dc7c2f BB |
1713 | } |
1714 | ||
1715 | static int | |
1716 | dsl_dataset_snapshot_reserve_space(dsl_dataset_t *ds, dmu_tx_t *tx) | |
1717 | { | |
1718 | uint64_t asize; | |
1719 | ||
1720 | if (!dmu_tx_is_syncing(tx)) | |
1721 | return (0); | |
1722 | ||
1723 | /* | |
1724 | * If there's an fs-only reservation, any blocks that might become | |
1725 | * owned by the snapshot dataset must be accommodated by space | |
1726 | * outside of the reservation. | |
1727 | */ | |
1728 | asize = MIN(dsl_dataset_unique(ds), ds->ds_reserved); | |
1729 | if (asize > dsl_dir_space_available(ds->ds_dir, NULL, 0, FALSE)) | |
1730 | return (ENOSPC); | |
1731 | ||
1732 | /* | |
1733 | * Propogate any reserved space for this snapshot to other | |
1734 | * snapshot checks in this sync group. | |
1735 | */ | |
1736 | if (asize > 0) | |
1737 | dsl_dir_willuse_space(ds->ds_dir, asize, tx); | |
1738 | ||
1739 | return (0); | |
1740 | } | |
1741 | ||
1742 | /* ARGSUSED */ | |
1743 | int | |
1744 | dsl_dataset_snapshot_check(void *arg1, void *arg2, dmu_tx_t *tx) | |
1745 | { | |
1746 | dsl_dataset_t *ds = arg1; | |
1747 | const char *snapname = arg2; | |
34dc7c2f BB |
1748 | int err; |
1749 | uint64_t value; | |
1750 | ||
1751 | /* | |
1752 | * We don't allow multiple snapshots of the same txg. If there | |
1753 | * is already one, try again. | |
1754 | */ | |
1755 | if (ds->ds_phys->ds_prev_snap_txg >= tx->tx_txg) | |
1756 | return (EAGAIN); | |
1757 | ||
1758 | /* | |
1759 | * Check for conflicting name snapshot name. | |
1760 | */ | |
b128c09f | 1761 | err = dsl_dataset_snap_lookup(ds, snapname, &value); |
34dc7c2f BB |
1762 | if (err == 0) |
1763 | return (EEXIST); | |
1764 | if (err != ENOENT) | |
1765 | return (err); | |
1766 | ||
1767 | /* | |
1768 | * Check that the dataset's name is not too long. Name consists | |
1769 | * of the dataset's length + 1 for the @-sign + snapshot name's length | |
1770 | */ | |
1771 | if (dsl_dataset_namelen(ds) + 1 + strlen(snapname) >= MAXNAMELEN) | |
1772 | return (ENAMETOOLONG); | |
1773 | ||
1774 | err = dsl_dataset_snapshot_reserve_space(ds, tx); | |
1775 | if (err) | |
1776 | return (err); | |
1777 | ||
1778 | ds->ds_trysnap_txg = tx->tx_txg; | |
1779 | return (0); | |
1780 | } | |
1781 | ||
1782 | void | |
1783 | dsl_dataset_snapshot_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) | |
1784 | { | |
1785 | dsl_dataset_t *ds = arg1; | |
1786 | const char *snapname = arg2; | |
1787 | dsl_pool_t *dp = ds->ds_dir->dd_pool; | |
1788 | dmu_buf_t *dbuf; | |
1789 | dsl_dataset_phys_t *dsphys; | |
b128c09f | 1790 | uint64_t dsobj, crtxg; |
34dc7c2f BB |
1791 | objset_t *mos = dp->dp_meta_objset; |
1792 | int err; | |
1793 | ||
34dc7c2f BB |
1794 | ASSERT(RW_WRITE_HELD(&dp->dp_config_rwlock)); |
1795 | ||
b128c09f BB |
1796 | /* |
1797 | * The origin's ds_creation_txg has to be < TXG_INITIAL | |
1798 | */ | |
1799 | if (strcmp(snapname, ORIGIN_DIR_NAME) == 0) | |
1800 | crtxg = 1; | |
1801 | else | |
1802 | crtxg = tx->tx_txg; | |
1803 | ||
34dc7c2f BB |
1804 | dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, |
1805 | DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); | |
1806 | VERIFY(0 == dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); | |
1807 | dmu_buf_will_dirty(dbuf, tx); | |
1808 | dsphys = dbuf->db_data; | |
b128c09f | 1809 | bzero(dsphys, sizeof (dsl_dataset_phys_t)); |
34dc7c2f BB |
1810 | dsphys->ds_dir_obj = ds->ds_dir->dd_object; |
1811 | dsphys->ds_fsid_guid = unique_create(); | |
1812 | (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, | |
1813 | sizeof (dsphys->ds_guid)); | |
1814 | dsphys->ds_prev_snap_obj = ds->ds_phys->ds_prev_snap_obj; | |
1815 | dsphys->ds_prev_snap_txg = ds->ds_phys->ds_prev_snap_txg; | |
1816 | dsphys->ds_next_snap_obj = ds->ds_object; | |
1817 | dsphys->ds_num_children = 1; | |
1818 | dsphys->ds_creation_time = gethrestime_sec(); | |
b128c09f | 1819 | dsphys->ds_creation_txg = crtxg; |
34dc7c2f BB |
1820 | dsphys->ds_deadlist_obj = ds->ds_phys->ds_deadlist_obj; |
1821 | dsphys->ds_used_bytes = ds->ds_phys->ds_used_bytes; | |
1822 | dsphys->ds_compressed_bytes = ds->ds_phys->ds_compressed_bytes; | |
1823 | dsphys->ds_uncompressed_bytes = ds->ds_phys->ds_uncompressed_bytes; | |
1824 | dsphys->ds_flags = ds->ds_phys->ds_flags; | |
1825 | dsphys->ds_bp = ds->ds_phys->ds_bp; | |
1826 | dmu_buf_rele(dbuf, FTAG); | |
1827 | ||
1828 | ASSERT3U(ds->ds_prev != 0, ==, ds->ds_phys->ds_prev_snap_obj != 0); | |
1829 | if (ds->ds_prev) { | |
b128c09f BB |
1830 | uint64_t next_clones_obj = |
1831 | ds->ds_prev->ds_phys->ds_next_clones_obj; | |
34dc7c2f BB |
1832 | ASSERT(ds->ds_prev->ds_phys->ds_next_snap_obj == |
1833 | ds->ds_object || | |
1834 | ds->ds_prev->ds_phys->ds_num_children > 1); | |
1835 | if (ds->ds_prev->ds_phys->ds_next_snap_obj == ds->ds_object) { | |
1836 | dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); | |
1837 | ASSERT3U(ds->ds_phys->ds_prev_snap_txg, ==, | |
1838 | ds->ds_prev->ds_phys->ds_creation_txg); | |
1839 | ds->ds_prev->ds_phys->ds_next_snap_obj = dsobj; | |
b128c09f BB |
1840 | } else if (next_clones_obj != 0) { |
1841 | VERIFY3U(0, ==, zap_remove_int(mos, | |
1842 | next_clones_obj, dsphys->ds_next_snap_obj, tx)); | |
1843 | VERIFY3U(0, ==, zap_add_int(mos, | |
1844 | next_clones_obj, dsobj, tx)); | |
34dc7c2f BB |
1845 | } |
1846 | } | |
1847 | ||
1848 | /* | |
1849 | * If we have a reference-reservation on this dataset, we will | |
1850 | * need to increase the amount of refreservation being charged | |
1851 | * since our unique space is going to zero. | |
1852 | */ | |
1853 | if (ds->ds_reserved) { | |
1854 | int64_t add = MIN(dsl_dataset_unique(ds), ds->ds_reserved); | |
b128c09f BB |
1855 | dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, |
1856 | add, 0, 0, tx); | |
34dc7c2f BB |
1857 | } |
1858 | ||
1859 | bplist_close(&ds->ds_deadlist); | |
1860 | dmu_buf_will_dirty(ds->ds_dbuf, tx); | |
1861 | ASSERT3U(ds->ds_phys->ds_prev_snap_txg, <, tx->tx_txg); | |
1862 | ds->ds_phys->ds_prev_snap_obj = dsobj; | |
b128c09f | 1863 | ds->ds_phys->ds_prev_snap_txg = crtxg; |
34dc7c2f BB |
1864 | ds->ds_phys->ds_unique_bytes = 0; |
1865 | if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE) | |
1866 | ds->ds_phys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; | |
1867 | ds->ds_phys->ds_deadlist_obj = | |
1868 | bplist_create(mos, DSL_DEADLIST_BLOCKSIZE, tx); | |
1869 | VERIFY(0 == bplist_open(&ds->ds_deadlist, mos, | |
1870 | ds->ds_phys->ds_deadlist_obj)); | |
1871 | ||
1872 | dprintf("snap '%s' -> obj %llu\n", snapname, dsobj); | |
1873 | err = zap_add(mos, ds->ds_phys->ds_snapnames_zapobj, | |
1874 | snapname, 8, 1, &dsobj, tx); | |
1875 | ASSERT(err == 0); | |
1876 | ||
1877 | if (ds->ds_prev) | |
b128c09f BB |
1878 | dsl_dataset_drop_ref(ds->ds_prev, ds); |
1879 | VERIFY(0 == dsl_dataset_get_ref(dp, | |
1880 | ds->ds_phys->ds_prev_snap_obj, ds, &ds->ds_prev)); | |
1881 | ||
1882 | dsl_pool_ds_snapshotted(ds, tx); | |
34dc7c2f BB |
1883 | |
1884 | spa_history_internal_log(LOG_DS_SNAPSHOT, dp->dp_spa, tx, cr, | |
1885 | "dataset = %llu", dsobj); | |
1886 | } | |
1887 | ||
1888 | void | |
1889 | dsl_dataset_sync(dsl_dataset_t *ds, zio_t *zio, dmu_tx_t *tx) | |
1890 | { | |
1891 | ASSERT(dmu_tx_is_syncing(tx)); | |
1892 | ASSERT(ds->ds_user_ptr != NULL); | |
1893 | ASSERT(ds->ds_phys->ds_next_snap_obj == 0); | |
1894 | ||
1895 | /* | |
1896 | * in case we had to change ds_fsid_guid when we opened it, | |
1897 | * sync it out now. | |
1898 | */ | |
1899 | dmu_buf_will_dirty(ds->ds_dbuf, tx); | |
1900 | ds->ds_phys->ds_fsid_guid = ds->ds_fsid_guid; | |
1901 | ||
1902 | dsl_dir_dirty(ds->ds_dir, tx); | |
1903 | dmu_objset_sync(ds->ds_user_ptr, zio, tx); | |
1904 | } | |
1905 | ||
1906 | void | |
1907 | dsl_dataset_stats(dsl_dataset_t *ds, nvlist_t *nv) | |
1908 | { | |
1909 | uint64_t refd, avail, uobjs, aobjs; | |
1910 | ||
1911 | dsl_dir_stats(ds->ds_dir, nv); | |
1912 | ||
1913 | dsl_dataset_space(ds, &refd, &avail, &uobjs, &aobjs); | |
1914 | dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_AVAILABLE, avail); | |
1915 | dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFERENCED, refd); | |
1916 | ||
1917 | dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATION, | |
1918 | ds->ds_phys->ds_creation_time); | |
1919 | dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATETXG, | |
1920 | ds->ds_phys->ds_creation_txg); | |
1921 | dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFQUOTA, | |
1922 | ds->ds_quota); | |
1923 | dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRESERVATION, | |
1924 | ds->ds_reserved); | |
b128c09f BB |
1925 | dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_GUID, |
1926 | ds->ds_phys->ds_guid); | |
34dc7c2f BB |
1927 | |
1928 | if (ds->ds_phys->ds_next_snap_obj) { | |
1929 | /* | |
1930 | * This is a snapshot; override the dd's space used with | |
1931 | * our unique space and compression ratio. | |
1932 | */ | |
1933 | dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USED, | |
1934 | ds->ds_phys->ds_unique_bytes); | |
1935 | dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_COMPRESSRATIO, | |
1936 | ds->ds_phys->ds_compressed_bytes == 0 ? 100 : | |
1937 | (ds->ds_phys->ds_uncompressed_bytes * 100 / | |
1938 | ds->ds_phys->ds_compressed_bytes)); | |
1939 | } | |
1940 | } | |
1941 | ||
1942 | void | |
1943 | dsl_dataset_fast_stat(dsl_dataset_t *ds, dmu_objset_stats_t *stat) | |
1944 | { | |
1945 | stat->dds_creation_txg = ds->ds_phys->ds_creation_txg; | |
1946 | stat->dds_inconsistent = ds->ds_phys->ds_flags & DS_FLAG_INCONSISTENT; | |
1947 | stat->dds_guid = ds->ds_phys->ds_guid; | |
1948 | if (ds->ds_phys->ds_next_snap_obj) { | |
1949 | stat->dds_is_snapshot = B_TRUE; | |
1950 | stat->dds_num_clones = ds->ds_phys->ds_num_children - 1; | |
fb5f0bc8 BB |
1951 | } else { |
1952 | stat->dds_is_snapshot = B_FALSE; | |
1953 | stat->dds_num_clones = 0; | |
34dc7c2f BB |
1954 | } |
1955 | ||
1956 | /* clone origin is really a dsl_dir thing... */ | |
1957 | rw_enter(&ds->ds_dir->dd_pool->dp_config_rwlock, RW_READER); | |
b128c09f | 1958 | if (dsl_dir_is_clone(ds->ds_dir)) { |
34dc7c2f BB |
1959 | dsl_dataset_t *ods; |
1960 | ||
b128c09f BB |
1961 | VERIFY(0 == dsl_dataset_get_ref(ds->ds_dir->dd_pool, |
1962 | ds->ds_dir->dd_phys->dd_origin_obj, FTAG, &ods)); | |
34dc7c2f | 1963 | dsl_dataset_name(ods, stat->dds_origin); |
b128c09f | 1964 | dsl_dataset_drop_ref(ods, FTAG); |
fb5f0bc8 BB |
1965 | } else { |
1966 | stat->dds_origin[0] = '\0'; | |
34dc7c2f BB |
1967 | } |
1968 | rw_exit(&ds->ds_dir->dd_pool->dp_config_rwlock); | |
1969 | } | |
1970 | ||
1971 | uint64_t | |
1972 | dsl_dataset_fsid_guid(dsl_dataset_t *ds) | |
1973 | { | |
1974 | return (ds->ds_fsid_guid); | |
1975 | } | |
1976 | ||
1977 | void | |
1978 | dsl_dataset_space(dsl_dataset_t *ds, | |
1979 | uint64_t *refdbytesp, uint64_t *availbytesp, | |
1980 | uint64_t *usedobjsp, uint64_t *availobjsp) | |
1981 | { | |
1982 | *refdbytesp = ds->ds_phys->ds_used_bytes; | |
1983 | *availbytesp = dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE); | |
1984 | if (ds->ds_reserved > ds->ds_phys->ds_unique_bytes) | |
1985 | *availbytesp += ds->ds_reserved - ds->ds_phys->ds_unique_bytes; | |
1986 | if (ds->ds_quota != 0) { | |
1987 | /* | |
1988 | * Adjust available bytes according to refquota | |
1989 | */ | |
1990 | if (*refdbytesp < ds->ds_quota) | |
1991 | *availbytesp = MIN(*availbytesp, | |
1992 | ds->ds_quota - *refdbytesp); | |
1993 | else | |
1994 | *availbytesp = 0; | |
1995 | } | |
1996 | *usedobjsp = ds->ds_phys->ds_bp.blk_fill; | |
1997 | *availobjsp = DN_MAX_OBJECT - *usedobjsp; | |
1998 | } | |
1999 | ||
2000 | boolean_t | |
2001 | dsl_dataset_modified_since_lastsnap(dsl_dataset_t *ds) | |
2002 | { | |
2003 | dsl_pool_t *dp = ds->ds_dir->dd_pool; | |
2004 | ||
2005 | ASSERT(RW_LOCK_HELD(&dp->dp_config_rwlock) || | |
2006 | dsl_pool_sync_context(dp)); | |
2007 | if (ds->ds_prev == NULL) | |
2008 | return (B_FALSE); | |
2009 | if (ds->ds_phys->ds_bp.blk_birth > | |
2010 | ds->ds_prev->ds_phys->ds_creation_txg) | |
2011 | return (B_TRUE); | |
2012 | return (B_FALSE); | |
2013 | } | |
2014 | ||
2015 | /* ARGSUSED */ | |
2016 | static int | |
2017 | dsl_dataset_snapshot_rename_check(void *arg1, void *arg2, dmu_tx_t *tx) | |
2018 | { | |
2019 | dsl_dataset_t *ds = arg1; | |
2020 | char *newsnapname = arg2; | |
2021 | dsl_dir_t *dd = ds->ds_dir; | |
34dc7c2f BB |
2022 | dsl_dataset_t *hds; |
2023 | uint64_t val; | |
2024 | int err; | |
2025 | ||
b128c09f BB |
2026 | err = dsl_dataset_hold_obj(dd->dd_pool, |
2027 | dd->dd_phys->dd_head_dataset_obj, FTAG, &hds); | |
34dc7c2f BB |
2028 | if (err) |
2029 | return (err); | |
2030 | ||
2031 | /* new name better not be in use */ | |
b128c09f BB |
2032 | err = dsl_dataset_snap_lookup(hds, newsnapname, &val); |
2033 | dsl_dataset_rele(hds, FTAG); | |
34dc7c2f BB |
2034 | |
2035 | if (err == 0) | |
2036 | err = EEXIST; | |
2037 | else if (err == ENOENT) | |
2038 | err = 0; | |
2039 | ||
2040 | /* dataset name + 1 for the "@" + the new snapshot name must fit */ | |
2041 | if (dsl_dir_namelen(ds->ds_dir) + 1 + strlen(newsnapname) >= MAXNAMELEN) | |
2042 | err = ENAMETOOLONG; | |
2043 | ||
2044 | return (err); | |
2045 | } | |
2046 | ||
2047 | static void | |
2048 | dsl_dataset_snapshot_rename_sync(void *arg1, void *arg2, | |
2049 | cred_t *cr, dmu_tx_t *tx) | |
2050 | { | |
2051 | dsl_dataset_t *ds = arg1; | |
2052 | const char *newsnapname = arg2; | |
2053 | dsl_dir_t *dd = ds->ds_dir; | |
2054 | objset_t *mos = dd->dd_pool->dp_meta_objset; | |
2055 | dsl_dataset_t *hds; | |
2056 | int err; | |
2057 | ||
2058 | ASSERT(ds->ds_phys->ds_next_snap_obj != 0); | |
2059 | ||
b128c09f BB |
2060 | VERIFY(0 == dsl_dataset_hold_obj(dd->dd_pool, |
2061 | dd->dd_phys->dd_head_dataset_obj, FTAG, &hds)); | |
34dc7c2f BB |
2062 | |
2063 | VERIFY(0 == dsl_dataset_get_snapname(ds)); | |
b128c09f | 2064 | err = dsl_dataset_snap_remove(hds, ds->ds_snapname, tx); |
34dc7c2f BB |
2065 | ASSERT3U(err, ==, 0); |
2066 | mutex_enter(&ds->ds_lock); | |
2067 | (void) strcpy(ds->ds_snapname, newsnapname); | |
2068 | mutex_exit(&ds->ds_lock); | |
2069 | err = zap_add(mos, hds->ds_phys->ds_snapnames_zapobj, | |
2070 | ds->ds_snapname, 8, 1, &ds->ds_object, tx); | |
2071 | ASSERT3U(err, ==, 0); | |
2072 | ||
2073 | spa_history_internal_log(LOG_DS_RENAME, dd->dd_pool->dp_spa, tx, | |
2074 | cr, "dataset = %llu", ds->ds_object); | |
b128c09f | 2075 | dsl_dataset_rele(hds, FTAG); |
34dc7c2f BB |
2076 | } |
2077 | ||
2078 | struct renamesnaparg { | |
2079 | dsl_sync_task_group_t *dstg; | |
2080 | char failed[MAXPATHLEN]; | |
2081 | char *oldsnap; | |
2082 | char *newsnap; | |
2083 | }; | |
2084 | ||
2085 | static int | |
2086 | dsl_snapshot_rename_one(char *name, void *arg) | |
2087 | { | |
2088 | struct renamesnaparg *ra = arg; | |
2089 | dsl_dataset_t *ds = NULL; | |
2090 | char *cp; | |
2091 | int err; | |
2092 | ||
2093 | cp = name + strlen(name); | |
2094 | *cp = '@'; | |
2095 | (void) strcpy(cp + 1, ra->oldsnap); | |
2096 | ||
2097 | /* | |
2098 | * For recursive snapshot renames the parent won't be changing | |
2099 | * so we just pass name for both the to/from argument. | |
2100 | */ | |
b128c09f | 2101 | err = zfs_secpolicy_rename_perms(name, name, CRED()); |
34dc7c2f | 2102 | if (err == ENOENT) { |
34dc7c2f | 2103 | return (0); |
b128c09f | 2104 | } else if (err) { |
34dc7c2f | 2105 | (void) strcpy(ra->failed, name); |
34dc7c2f BB |
2106 | return (err); |
2107 | } | |
2108 | ||
2109 | #ifdef _KERNEL | |
b128c09f BB |
2110 | /* |
2111 | * For all filesystems undergoing rename, we'll need to unmount it. | |
2112 | */ | |
34dc7c2f BB |
2113 | (void) zfs_unmount_snap(name, NULL); |
2114 | #endif | |
b128c09f | 2115 | err = dsl_dataset_hold(name, ra->dstg, &ds); |
34dc7c2f | 2116 | *cp = '\0'; |
b128c09f BB |
2117 | if (err == ENOENT) { |
2118 | return (0); | |
2119 | } else if (err) { | |
2120 | (void) strcpy(ra->failed, name); | |
2121 | return (err); | |
2122 | } | |
34dc7c2f BB |
2123 | |
2124 | dsl_sync_task_create(ra->dstg, dsl_dataset_snapshot_rename_check, | |
2125 | dsl_dataset_snapshot_rename_sync, ds, ra->newsnap, 0); | |
2126 | ||
2127 | return (0); | |
2128 | } | |
2129 | ||
2130 | static int | |
2131 | dsl_recursive_rename(char *oldname, const char *newname) | |
2132 | { | |
2133 | int err; | |
2134 | struct renamesnaparg *ra; | |
2135 | dsl_sync_task_t *dst; | |
2136 | spa_t *spa; | |
2137 | char *cp, *fsname = spa_strdup(oldname); | |
2138 | int len = strlen(oldname); | |
2139 | ||
2140 | /* truncate the snapshot name to get the fsname */ | |
2141 | cp = strchr(fsname, '@'); | |
2142 | *cp = '\0'; | |
2143 | ||
2144 | err = spa_open(fsname, &spa, FTAG); | |
2145 | if (err) { | |
2146 | kmem_free(fsname, len + 1); | |
2147 | return (err); | |
2148 | } | |
2149 | ra = kmem_alloc(sizeof (struct renamesnaparg), KM_SLEEP); | |
2150 | ra->dstg = dsl_sync_task_group_create(spa_get_dsl(spa)); | |
2151 | ||
2152 | ra->oldsnap = strchr(oldname, '@') + 1; | |
2153 | ra->newsnap = strchr(newname, '@') + 1; | |
2154 | *ra->failed = '\0'; | |
2155 | ||
2156 | err = dmu_objset_find(fsname, dsl_snapshot_rename_one, ra, | |
2157 | DS_FIND_CHILDREN); | |
2158 | kmem_free(fsname, len + 1); | |
2159 | ||
2160 | if (err == 0) { | |
2161 | err = dsl_sync_task_group_wait(ra->dstg); | |
2162 | } | |
2163 | ||
2164 | for (dst = list_head(&ra->dstg->dstg_tasks); dst; | |
2165 | dst = list_next(&ra->dstg->dstg_tasks, dst)) { | |
2166 | dsl_dataset_t *ds = dst->dst_arg1; | |
2167 | if (dst->dst_err) { | |
2168 | dsl_dir_name(ds->ds_dir, ra->failed); | |
2169 | (void) strcat(ra->failed, "@"); | |
2170 | (void) strcat(ra->failed, ra->newsnap); | |
2171 | } | |
b128c09f | 2172 | dsl_dataset_rele(ds, ra->dstg); |
34dc7c2f BB |
2173 | } |
2174 | ||
2175 | if (err) | |
2176 | (void) strcpy(oldname, ra->failed); | |
2177 | ||
2178 | dsl_sync_task_group_destroy(ra->dstg); | |
2179 | kmem_free(ra, sizeof (struct renamesnaparg)); | |
2180 | spa_close(spa, FTAG); | |
2181 | return (err); | |
2182 | } | |
2183 | ||
2184 | static int | |
2185 | dsl_valid_rename(char *oldname, void *arg) | |
2186 | { | |
2187 | int delta = *(int *)arg; | |
2188 | ||
2189 | if (strlen(oldname) + delta >= MAXNAMELEN) | |
2190 | return (ENAMETOOLONG); | |
2191 | ||
2192 | return (0); | |
2193 | } | |
2194 | ||
2195 | #pragma weak dmu_objset_rename = dsl_dataset_rename | |
2196 | int | |
b128c09f | 2197 | dsl_dataset_rename(char *oldname, const char *newname, boolean_t recursive) |
34dc7c2f BB |
2198 | { |
2199 | dsl_dir_t *dd; | |
2200 | dsl_dataset_t *ds; | |
2201 | const char *tail; | |
2202 | int err; | |
2203 | ||
2204 | err = dsl_dir_open(oldname, FTAG, &dd, &tail); | |
2205 | if (err) | |
2206 | return (err); | |
2207 | if (tail == NULL) { | |
2208 | int delta = strlen(newname) - strlen(oldname); | |
2209 | ||
b128c09f | 2210 | /* if we're growing, validate child name lengths */ |
34dc7c2f BB |
2211 | if (delta > 0) |
2212 | err = dmu_objset_find(oldname, dsl_valid_rename, | |
2213 | &delta, DS_FIND_CHILDREN | DS_FIND_SNAPSHOTS); | |
2214 | ||
2215 | if (!err) | |
2216 | err = dsl_dir_rename(dd, newname); | |
2217 | dsl_dir_close(dd, FTAG); | |
2218 | return (err); | |
2219 | } | |
2220 | if (tail[0] != '@') { | |
2221 | /* the name ended in a nonexistant component */ | |
2222 | dsl_dir_close(dd, FTAG); | |
2223 | return (ENOENT); | |
2224 | } | |
2225 | ||
2226 | dsl_dir_close(dd, FTAG); | |
2227 | ||
2228 | /* new name must be snapshot in same filesystem */ | |
2229 | tail = strchr(newname, '@'); | |
2230 | if (tail == NULL) | |
2231 | return (EINVAL); | |
2232 | tail++; | |
2233 | if (strncmp(oldname, newname, tail - newname) != 0) | |
2234 | return (EXDEV); | |
2235 | ||
2236 | if (recursive) { | |
2237 | err = dsl_recursive_rename(oldname, newname); | |
2238 | } else { | |
b128c09f | 2239 | err = dsl_dataset_hold(oldname, FTAG, &ds); |
34dc7c2f BB |
2240 | if (err) |
2241 | return (err); | |
2242 | ||
2243 | err = dsl_sync_task_do(ds->ds_dir->dd_pool, | |
2244 | dsl_dataset_snapshot_rename_check, | |
2245 | dsl_dataset_snapshot_rename_sync, ds, (char *)tail, 1); | |
2246 | ||
b128c09f | 2247 | dsl_dataset_rele(ds, FTAG); |
34dc7c2f BB |
2248 | } |
2249 | ||
2250 | return (err); | |
2251 | } | |
2252 | ||
b128c09f BB |
2253 | struct promotenode { |
2254 | list_node_t link; | |
2255 | dsl_dataset_t *ds; | |
2256 | }; | |
2257 | ||
34dc7c2f | 2258 | struct promotearg { |
b128c09f BB |
2259 | list_t shared_snaps, origin_snaps, clone_snaps; |
2260 | dsl_dataset_t *origin_origin, *origin_head; | |
2261 | uint64_t used, comp, uncomp, unique, cloneusedsnap, originusedsnap; | |
34dc7c2f BB |
2262 | }; |
2263 | ||
b128c09f BB |
2264 | static int snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep); |
2265 | ||
34dc7c2f BB |
2266 | /* ARGSUSED */ |
2267 | static int | |
2268 | dsl_dataset_promote_check(void *arg1, void *arg2, dmu_tx_t *tx) | |
2269 | { | |
2270 | dsl_dataset_t *hds = arg1; | |
2271 | struct promotearg *pa = arg2; | |
b128c09f BB |
2272 | struct promotenode *snap = list_head(&pa->shared_snaps); |
2273 | dsl_dataset_t *origin_ds = snap->ds; | |
34dc7c2f | 2274 | int err; |
34dc7c2f | 2275 | |
b128c09f BB |
2276 | /* Check that it is a real clone */ |
2277 | if (!dsl_dir_is_clone(hds->ds_dir)) | |
34dc7c2f BB |
2278 | return (EINVAL); |
2279 | ||
2280 | /* Since this is so expensive, don't do the preliminary check */ | |
2281 | if (!dmu_tx_is_syncing(tx)) | |
2282 | return (0); | |
2283 | ||
b128c09f BB |
2284 | if (hds->ds_phys->ds_flags & DS_FLAG_NOPROMOTE) |
2285 | return (EXDEV); | |
34dc7c2f BB |
2286 | |
2287 | /* compute origin's new unique space */ | |
b128c09f BB |
2288 | snap = list_tail(&pa->clone_snaps); |
2289 | ASSERT3U(snap->ds->ds_phys->ds_prev_snap_obj, ==, origin_ds->ds_object); | |
2290 | err = bplist_space_birthrange(&snap->ds->ds_deadlist, | |
2291 | origin_ds->ds_phys->ds_prev_snap_txg, UINT64_MAX, &pa->unique); | |
2292 | if (err) | |
2293 | return (err); | |
34dc7c2f | 2294 | |
b128c09f BB |
2295 | /* |
2296 | * Walk the snapshots that we are moving | |
2297 | * | |
2298 | * Compute space to transfer. Consider the incremental changes | |
2299 | * to used for each snapshot: | |
2300 | * (my used) = (prev's used) + (blocks born) - (blocks killed) | |
2301 | * So each snapshot gave birth to: | |
2302 | * (blocks born) = (my used) - (prev's used) + (blocks killed) | |
2303 | * So a sequence would look like: | |
2304 | * (uN - u(N-1) + kN) + ... + (u1 - u0 + k1) + (u0 - 0 + k0) | |
2305 | * Which simplifies to: | |
2306 | * uN + kN + kN-1 + ... + k1 + k0 | |
2307 | * Note however, if we stop before we reach the ORIGIN we get: | |
2308 | * uN + kN + kN-1 + ... + kM - uM-1 | |
2309 | */ | |
2310 | pa->used = origin_ds->ds_phys->ds_used_bytes; | |
2311 | pa->comp = origin_ds->ds_phys->ds_compressed_bytes; | |
2312 | pa->uncomp = origin_ds->ds_phys->ds_uncompressed_bytes; | |
2313 | for (snap = list_head(&pa->shared_snaps); snap; | |
2314 | snap = list_next(&pa->shared_snaps, snap)) { | |
34dc7c2f | 2315 | uint64_t val, dlused, dlcomp, dluncomp; |
b128c09f | 2316 | dsl_dataset_t *ds = snap->ds; |
34dc7c2f BB |
2317 | |
2318 | /* Check that the snapshot name does not conflict */ | |
b128c09f BB |
2319 | VERIFY(0 == dsl_dataset_get_snapname(ds)); |
2320 | err = dsl_dataset_snap_lookup(hds, ds->ds_snapname, &val); | |
2321 | if (err == 0) | |
2322 | return (EEXIST); | |
2323 | if (err != ENOENT) | |
2324 | return (err); | |
34dc7c2f | 2325 | |
b128c09f | 2326 | /* The very first snapshot does not have a deadlist */ |
34dc7c2f | 2327 | if (ds->ds_phys->ds_prev_snap_obj == 0) |
b128c09f | 2328 | continue; |
34dc7c2f BB |
2329 | |
2330 | if (err = bplist_space(&ds->ds_deadlist, | |
2331 | &dlused, &dlcomp, &dluncomp)) | |
b128c09f BB |
2332 | return (err); |
2333 | pa->used += dlused; | |
2334 | pa->comp += dlcomp; | |
2335 | pa->uncomp += dluncomp; | |
2336 | } | |
34dc7c2f | 2337 | |
b128c09f BB |
2338 | /* |
2339 | * If we are a clone of a clone then we never reached ORIGIN, | |
2340 | * so we need to subtract out the clone origin's used space. | |
2341 | */ | |
2342 | if (pa->origin_origin) { | |
2343 | pa->used -= pa->origin_origin->ds_phys->ds_used_bytes; | |
2344 | pa->comp -= pa->origin_origin->ds_phys->ds_compressed_bytes; | |
2345 | pa->uncomp -= pa->origin_origin->ds_phys->ds_uncompressed_bytes; | |
34dc7c2f BB |
2346 | } |
2347 | ||
2348 | /* Check that there is enough space here */ | |
b128c09f BB |
2349 | err = dsl_dir_transfer_possible(origin_ds->ds_dir, hds->ds_dir, |
2350 | pa->used); | |
2351 | if (err) | |
2352 | return (err); | |
34dc7c2f | 2353 | |
b128c09f BB |
2354 | /* |
2355 | * Compute the amounts of space that will be used by snapshots | |
2356 | * after the promotion (for both origin and clone). For each, | |
2357 | * it is the amount of space that will be on all of their | |
2358 | * deadlists (that was not born before their new origin). | |
2359 | */ | |
2360 | if (hds->ds_dir->dd_phys->dd_flags & DD_FLAG_USED_BREAKDOWN) { | |
2361 | uint64_t space; | |
2362 | ||
2363 | /* | |
2364 | * Note, typically this will not be a clone of a clone, | |
2365 | * so snap->ds->ds_origin_txg will be < TXG_INITIAL, so | |
2366 | * these snaplist_space() -> bplist_space_birthrange() | |
2367 | * calls will be fast because they do not have to | |
2368 | * iterate over all bps. | |
2369 | */ | |
2370 | snap = list_head(&pa->origin_snaps); | |
2371 | err = snaplist_space(&pa->shared_snaps, | |
2372 | snap->ds->ds_origin_txg, &pa->cloneusedsnap); | |
2373 | if (err) | |
2374 | return (err); | |
2375 | ||
2376 | err = snaplist_space(&pa->clone_snaps, | |
2377 | snap->ds->ds_origin_txg, &space); | |
2378 | if (err) | |
2379 | return (err); | |
2380 | pa->cloneusedsnap += space; | |
2381 | } | |
2382 | if (origin_ds->ds_dir->dd_phys->dd_flags & DD_FLAG_USED_BREAKDOWN) { | |
2383 | err = snaplist_space(&pa->origin_snaps, | |
2384 | origin_ds->ds_phys->ds_creation_txg, &pa->originusedsnap); | |
2385 | if (err) | |
2386 | return (err); | |
2387 | } | |
2388 | ||
2389 | return (0); | |
34dc7c2f BB |
2390 | } |
2391 | ||
2392 | static void | |
2393 | dsl_dataset_promote_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) | |
2394 | { | |
2395 | dsl_dataset_t *hds = arg1; | |
2396 | struct promotearg *pa = arg2; | |
b128c09f BB |
2397 | struct promotenode *snap = list_head(&pa->shared_snaps); |
2398 | dsl_dataset_t *origin_ds = snap->ds; | |
2399 | dsl_dataset_t *origin_head; | |
34dc7c2f BB |
2400 | dsl_dir_t *dd = hds->ds_dir; |
2401 | dsl_pool_t *dp = hds->ds_dir->dd_pool; | |
2402 | dsl_dir_t *odd = NULL; | |
b128c09f BB |
2403 | uint64_t oldnext_obj; |
2404 | int64_t delta; | |
34dc7c2f | 2405 | |
34dc7c2f BB |
2406 | ASSERT(0 == (hds->ds_phys->ds_flags & DS_FLAG_NOPROMOTE)); |
2407 | ||
b128c09f BB |
2408 | snap = list_head(&pa->origin_snaps); |
2409 | origin_head = snap->ds; | |
2410 | ||
34dc7c2f BB |
2411 | /* |
2412 | * We need to explicitly open odd, since origin_ds's dd will be | |
2413 | * changing. | |
2414 | */ | |
2415 | VERIFY(0 == dsl_dir_open_obj(dp, origin_ds->ds_dir->dd_object, | |
2416 | NULL, FTAG, &odd)); | |
2417 | ||
b128c09f BB |
2418 | /* change origin's next snap */ |
2419 | dmu_buf_will_dirty(origin_ds->ds_dbuf, tx); | |
2420 | oldnext_obj = origin_ds->ds_phys->ds_next_snap_obj; | |
2421 | snap = list_tail(&pa->clone_snaps); | |
2422 | ASSERT3U(snap->ds->ds_phys->ds_prev_snap_obj, ==, origin_ds->ds_object); | |
2423 | origin_ds->ds_phys->ds_next_snap_obj = snap->ds->ds_object; | |
2424 | ||
2425 | /* change the origin's next clone */ | |
2426 | if (origin_ds->ds_phys->ds_next_clones_obj) { | |
2427 | VERIFY3U(0, ==, zap_remove_int(dp->dp_meta_objset, | |
2428 | origin_ds->ds_phys->ds_next_clones_obj, | |
2429 | origin_ds->ds_phys->ds_next_snap_obj, tx)); | |
2430 | VERIFY3U(0, ==, zap_add_int(dp->dp_meta_objset, | |
2431 | origin_ds->ds_phys->ds_next_clones_obj, | |
2432 | oldnext_obj, tx)); | |
2433 | } | |
2434 | ||
2435 | /* change origin */ | |
2436 | dmu_buf_will_dirty(dd->dd_dbuf, tx); | |
2437 | ASSERT3U(dd->dd_phys->dd_origin_obj, ==, origin_ds->ds_object); | |
2438 | dd->dd_phys->dd_origin_obj = odd->dd_phys->dd_origin_obj; | |
2439 | hds->ds_origin_txg = origin_head->ds_origin_txg; | |
2440 | dmu_buf_will_dirty(odd->dd_dbuf, tx); | |
2441 | odd->dd_phys->dd_origin_obj = origin_ds->ds_object; | |
2442 | origin_head->ds_origin_txg = origin_ds->ds_phys->ds_creation_txg; | |
34dc7c2f | 2443 | |
b128c09f BB |
2444 | /* move snapshots to this dir */ |
2445 | for (snap = list_head(&pa->shared_snaps); snap; | |
2446 | snap = list_next(&pa->shared_snaps, snap)) { | |
2447 | dsl_dataset_t *ds = snap->ds; | |
2448 | ||
2449 | /* unregister props as dsl_dir is changing */ | |
2450 | if (ds->ds_user_ptr) { | |
2451 | ds->ds_user_evict_func(ds, ds->ds_user_ptr); | |
2452 | ds->ds_user_ptr = NULL; | |
2453 | } | |
34dc7c2f | 2454 | /* move snap name entry */ |
b128c09f BB |
2455 | VERIFY(0 == dsl_dataset_get_snapname(ds)); |
2456 | VERIFY(0 == dsl_dataset_snap_remove(origin_head, | |
2457 | ds->ds_snapname, tx)); | |
34dc7c2f BB |
2458 | VERIFY(0 == zap_add(dp->dp_meta_objset, |
2459 | hds->ds_phys->ds_snapnames_zapobj, ds->ds_snapname, | |
2460 | 8, 1, &ds->ds_object, tx)); | |
34dc7c2f BB |
2461 | /* change containing dsl_dir */ |
2462 | dmu_buf_will_dirty(ds->ds_dbuf, tx); | |
2463 | ASSERT3U(ds->ds_phys->ds_dir_obj, ==, odd->dd_object); | |
2464 | ds->ds_phys->ds_dir_obj = dd->dd_object; | |
2465 | ASSERT3P(ds->ds_dir, ==, odd); | |
2466 | dsl_dir_close(ds->ds_dir, ds); | |
2467 | VERIFY(0 == dsl_dir_open_obj(dp, dd->dd_object, | |
2468 | NULL, ds, &ds->ds_dir)); | |
2469 | ||
2470 | ASSERT3U(dsl_prop_numcb(ds), ==, 0); | |
34dc7c2f | 2471 | } |
34dc7c2f | 2472 | |
b128c09f BB |
2473 | /* |
2474 | * Change space accounting. | |
2475 | * Note, pa->*usedsnap and dd_used_breakdown[SNAP] will either | |
2476 | * both be valid, or both be 0 (resulting in delta == 0). This | |
2477 | * is true for each of {clone,origin} independently. | |
2478 | */ | |
34dc7c2f | 2479 | |
b128c09f BB |
2480 | delta = pa->cloneusedsnap - |
2481 | dd->dd_phys->dd_used_breakdown[DD_USED_SNAP]; | |
2482 | ASSERT3S(delta, >=, 0); | |
2483 | ASSERT3U(pa->used, >=, delta); | |
2484 | dsl_dir_diduse_space(dd, DD_USED_SNAP, delta, 0, 0, tx); | |
2485 | dsl_dir_diduse_space(dd, DD_USED_HEAD, | |
2486 | pa->used - delta, pa->comp, pa->uncomp, tx); | |
2487 | ||
2488 | delta = pa->originusedsnap - | |
2489 | odd->dd_phys->dd_used_breakdown[DD_USED_SNAP]; | |
2490 | ASSERT3S(delta, <=, 0); | |
2491 | ASSERT3U(pa->used, >=, -delta); | |
2492 | dsl_dir_diduse_space(odd, DD_USED_SNAP, delta, 0, 0, tx); | |
2493 | dsl_dir_diduse_space(odd, DD_USED_HEAD, | |
2494 | -pa->used - delta, -pa->comp, -pa->uncomp, tx); | |
34dc7c2f | 2495 | |
34dc7c2f BB |
2496 | origin_ds->ds_phys->ds_unique_bytes = pa->unique; |
2497 | ||
2498 | /* log history record */ | |
2499 | spa_history_internal_log(LOG_DS_PROMOTE, dd->dd_pool->dp_spa, tx, | |
b128c09f | 2500 | cr, "dataset = %llu", hds->ds_object); |
34dc7c2f BB |
2501 | |
2502 | dsl_dir_close(odd, FTAG); | |
34dc7c2f BB |
2503 | } |
2504 | ||
b128c09f BB |
2505 | static char *snaplist_tag = "snaplist"; |
2506 | /* | |
2507 | * Make a list of dsl_dataset_t's for the snapshots between first_obj | |
2508 | * (exclusive) and last_obj (inclusive). The list will be in reverse | |
2509 | * order (last_obj will be the list_head()). If first_obj == 0, do all | |
2510 | * snapshots back to this dataset's origin. | |
2511 | */ | |
2512 | static int | |
2513 | snaplist_make(dsl_pool_t *dp, boolean_t own, | |
2514 | uint64_t first_obj, uint64_t last_obj, list_t *l) | |
2515 | { | |
2516 | uint64_t obj = last_obj; | |
2517 | ||
2518 | ASSERT(RW_LOCK_HELD(&dp->dp_config_rwlock)); | |
2519 | ||
2520 | list_create(l, sizeof (struct promotenode), | |
2521 | offsetof(struct promotenode, link)); | |
2522 | ||
2523 | while (obj != first_obj) { | |
2524 | dsl_dataset_t *ds; | |
2525 | struct promotenode *snap; | |
2526 | int err; | |
2527 | ||
2528 | if (own) { | |
2529 | err = dsl_dataset_own_obj(dp, obj, | |
2530 | 0, snaplist_tag, &ds); | |
2531 | if (err == 0) | |
2532 | dsl_dataset_make_exclusive(ds, snaplist_tag); | |
2533 | } else { | |
2534 | err = dsl_dataset_hold_obj(dp, obj, snaplist_tag, &ds); | |
2535 | } | |
2536 | if (err == ENOENT) { | |
2537 | /* lost race with snapshot destroy */ | |
2538 | struct promotenode *last = list_tail(l); | |
2539 | ASSERT(obj != last->ds->ds_phys->ds_prev_snap_obj); | |
2540 | obj = last->ds->ds_phys->ds_prev_snap_obj; | |
2541 | continue; | |
2542 | } else if (err) { | |
2543 | return (err); | |
2544 | } | |
2545 | ||
2546 | if (first_obj == 0) | |
2547 | first_obj = ds->ds_dir->dd_phys->dd_origin_obj; | |
2548 | ||
2549 | snap = kmem_alloc(sizeof (struct promotenode), KM_SLEEP); | |
2550 | snap->ds = ds; | |
2551 | list_insert_tail(l, snap); | |
2552 | obj = ds->ds_phys->ds_prev_snap_obj; | |
2553 | } | |
2554 | ||
2555 | return (0); | |
2556 | } | |
2557 | ||
2558 | static int | |
2559 | snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep) | |
2560 | { | |
2561 | struct promotenode *snap; | |
2562 | ||
2563 | *spacep = 0; | |
2564 | for (snap = list_head(l); snap; snap = list_next(l, snap)) { | |
2565 | uint64_t used; | |
2566 | int err = bplist_space_birthrange(&snap->ds->ds_deadlist, | |
2567 | mintxg, UINT64_MAX, &used); | |
2568 | if (err) | |
2569 | return (err); | |
2570 | *spacep += used; | |
2571 | } | |
2572 | return (0); | |
2573 | } | |
2574 | ||
2575 | static void | |
2576 | snaplist_destroy(list_t *l, boolean_t own) | |
2577 | { | |
2578 | struct promotenode *snap; | |
2579 | ||
2580 | if (!list_link_active(&l->list_head)) | |
2581 | return; | |
2582 | ||
2583 | while ((snap = list_tail(l)) != NULL) { | |
2584 | list_remove(l, snap); | |
2585 | if (own) | |
2586 | dsl_dataset_disown(snap->ds, snaplist_tag); | |
2587 | else | |
2588 | dsl_dataset_rele(snap->ds, snaplist_tag); | |
2589 | kmem_free(snap, sizeof (struct promotenode)); | |
2590 | } | |
2591 | list_destroy(l); | |
2592 | } | |
2593 | ||
2594 | /* | |
2595 | * Promote a clone. Nomenclature note: | |
2596 | * "clone" or "cds": the original clone which is being promoted | |
2597 | * "origin" or "ods": the snapshot which is originally clone's origin | |
2598 | * "origin head" or "ohds": the dataset which is the head | |
2599 | * (filesystem/volume) for the origin | |
2600 | * "origin origin": the origin of the origin's filesystem (typically | |
2601 | * NULL, indicating that the clone is not a clone of a clone). | |
2602 | */ | |
34dc7c2f BB |
2603 | int |
2604 | dsl_dataset_promote(const char *name) | |
2605 | { | |
2606 | dsl_dataset_t *ds; | |
b128c09f BB |
2607 | dsl_dir_t *dd; |
2608 | dsl_pool_t *dp; | |
34dc7c2f | 2609 | dmu_object_info_t doi; |
b128c09f BB |
2610 | struct promotearg pa = { 0 }; |
2611 | struct promotenode *snap; | |
2612 | int err; | |
34dc7c2f | 2613 | |
b128c09f | 2614 | err = dsl_dataset_hold(name, FTAG, &ds); |
34dc7c2f BB |
2615 | if (err) |
2616 | return (err); | |
b128c09f BB |
2617 | dd = ds->ds_dir; |
2618 | dp = dd->dd_pool; | |
34dc7c2f | 2619 | |
b128c09f | 2620 | err = dmu_object_info(dp->dp_meta_objset, |
34dc7c2f BB |
2621 | ds->ds_phys->ds_snapnames_zapobj, &doi); |
2622 | if (err) { | |
b128c09f | 2623 | dsl_dataset_rele(ds, FTAG); |
34dc7c2f BB |
2624 | return (err); |
2625 | } | |
2626 | ||
b128c09f BB |
2627 | if (dsl_dataset_is_snapshot(ds) || dd->dd_phys->dd_origin_obj == 0) { |
2628 | dsl_dataset_rele(ds, FTAG); | |
2629 | return (EINVAL); | |
2630 | } | |
2631 | ||
2632 | /* | |
2633 | * We are going to inherit all the snapshots taken before our | |
2634 | * origin (i.e., our new origin will be our parent's origin). | |
2635 | * Take ownership of them so that we can rename them into our | |
2636 | * namespace. | |
2637 | */ | |
2638 | rw_enter(&dp->dp_config_rwlock, RW_READER); | |
2639 | ||
2640 | err = snaplist_make(dp, B_TRUE, 0, dd->dd_phys->dd_origin_obj, | |
2641 | &pa.shared_snaps); | |
2642 | if (err != 0) | |
2643 | goto out; | |
2644 | ||
2645 | err = snaplist_make(dp, B_FALSE, 0, ds->ds_object, &pa.clone_snaps); | |
2646 | if (err != 0) | |
2647 | goto out; | |
2648 | ||
2649 | snap = list_head(&pa.shared_snaps); | |
2650 | ASSERT3U(snap->ds->ds_object, ==, dd->dd_phys->dd_origin_obj); | |
2651 | err = snaplist_make(dp, B_FALSE, dd->dd_phys->dd_origin_obj, | |
2652 | snap->ds->ds_dir->dd_phys->dd_head_dataset_obj, &pa.origin_snaps); | |
2653 | if (err != 0) | |
2654 | goto out; | |
2655 | ||
2656 | if (dsl_dir_is_clone(snap->ds->ds_dir)) { | |
2657 | err = dsl_dataset_own_obj(dp, | |
2658 | snap->ds->ds_dir->dd_phys->dd_origin_obj, | |
2659 | 0, FTAG, &pa.origin_origin); | |
2660 | if (err != 0) | |
2661 | goto out; | |
2662 | } | |
2663 | ||
2664 | out: | |
2665 | rw_exit(&dp->dp_config_rwlock); | |
2666 | ||
34dc7c2f BB |
2667 | /* |
2668 | * Add in 128x the snapnames zapobj size, since we will be moving | |
2669 | * a bunch of snapnames to the promoted ds, and dirtying their | |
2670 | * bonus buffers. | |
2671 | */ | |
b128c09f BB |
2672 | if (err == 0) { |
2673 | err = dsl_sync_task_do(dp, dsl_dataset_promote_check, | |
2674 | dsl_dataset_promote_sync, ds, &pa, | |
2675 | 2 + 2 * doi.doi_physical_blks); | |
2676 | } | |
2677 | ||
2678 | snaplist_destroy(&pa.shared_snaps, B_TRUE); | |
2679 | snaplist_destroy(&pa.clone_snaps, B_FALSE); | |
2680 | snaplist_destroy(&pa.origin_snaps, B_FALSE); | |
2681 | if (pa.origin_origin) | |
2682 | dsl_dataset_disown(pa.origin_origin, FTAG); | |
2683 | dsl_dataset_rele(ds, FTAG); | |
34dc7c2f BB |
2684 | return (err); |
2685 | } | |
2686 | ||
2687 | struct cloneswaparg { | |
2688 | dsl_dataset_t *cds; /* clone dataset */ | |
2689 | dsl_dataset_t *ohds; /* origin's head dataset */ | |
2690 | boolean_t force; | |
2691 | int64_t unused_refres_delta; /* change in unconsumed refreservation */ | |
2692 | }; | |
2693 | ||
2694 | /* ARGSUSED */ | |
2695 | static int | |
2696 | dsl_dataset_clone_swap_check(void *arg1, void *arg2, dmu_tx_t *tx) | |
2697 | { | |
2698 | struct cloneswaparg *csa = arg1; | |
2699 | ||
2700 | /* they should both be heads */ | |
2701 | if (dsl_dataset_is_snapshot(csa->cds) || | |
2702 | dsl_dataset_is_snapshot(csa->ohds)) | |
2703 | return (EINVAL); | |
2704 | ||
2705 | /* the branch point should be just before them */ | |
2706 | if (csa->cds->ds_prev != csa->ohds->ds_prev) | |
2707 | return (EINVAL); | |
2708 | ||
2709 | /* cds should be the clone */ | |
2710 | if (csa->cds->ds_prev->ds_phys->ds_next_snap_obj != | |
2711 | csa->ohds->ds_object) | |
2712 | return (EINVAL); | |
2713 | ||
2714 | /* the clone should be a child of the origin */ | |
2715 | if (csa->cds->ds_dir->dd_parent != csa->ohds->ds_dir) | |
2716 | return (EINVAL); | |
2717 | ||
2718 | /* ohds shouldn't be modified unless 'force' */ | |
2719 | if (!csa->force && dsl_dataset_modified_since_lastsnap(csa->ohds)) | |
2720 | return (ETXTBSY); | |
2721 | ||
2722 | /* adjust amount of any unconsumed refreservation */ | |
2723 | csa->unused_refres_delta = | |
2724 | (int64_t)MIN(csa->ohds->ds_reserved, | |
2725 | csa->ohds->ds_phys->ds_unique_bytes) - | |
2726 | (int64_t)MIN(csa->ohds->ds_reserved, | |
2727 | csa->cds->ds_phys->ds_unique_bytes); | |
2728 | ||
2729 | if (csa->unused_refres_delta > 0 && | |
2730 | csa->unused_refres_delta > | |
2731 | dsl_dir_space_available(csa->ohds->ds_dir, NULL, 0, TRUE)) | |
2732 | return (ENOSPC); | |
2733 | ||
2734 | return (0); | |
2735 | } | |
2736 | ||
2737 | /* ARGSUSED */ | |
2738 | static void | |
2739 | dsl_dataset_clone_swap_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) | |
2740 | { | |
2741 | struct cloneswaparg *csa = arg1; | |
2742 | dsl_pool_t *dp = csa->cds->ds_dir->dd_pool; | |
34dc7c2f BB |
2743 | |
2744 | ASSERT(csa->cds->ds_reserved == 0); | |
2745 | ASSERT(csa->cds->ds_quota == csa->ohds->ds_quota); | |
2746 | ||
2747 | dmu_buf_will_dirty(csa->cds->ds_dbuf, tx); | |
2748 | dmu_buf_will_dirty(csa->ohds->ds_dbuf, tx); | |
2749 | dmu_buf_will_dirty(csa->cds->ds_prev->ds_dbuf, tx); | |
2750 | ||
2751 | if (csa->cds->ds_user_ptr != NULL) { | |
2752 | csa->cds->ds_user_evict_func(csa->cds, csa->cds->ds_user_ptr); | |
2753 | csa->cds->ds_user_ptr = NULL; | |
2754 | } | |
2755 | ||
2756 | if (csa->ohds->ds_user_ptr != NULL) { | |
2757 | csa->ohds->ds_user_evict_func(csa->ohds, | |
2758 | csa->ohds->ds_user_ptr); | |
2759 | csa->ohds->ds_user_ptr = NULL; | |
2760 | } | |
2761 | ||
34dc7c2f | 2762 | /* reset origin's unique bytes */ |
b128c09f BB |
2763 | VERIFY(0 == bplist_space_birthrange(&csa->cds->ds_deadlist, |
2764 | csa->cds->ds_prev->ds_phys->ds_prev_snap_txg, UINT64_MAX, | |
2765 | &csa->cds->ds_prev->ds_phys->ds_unique_bytes)); | |
34dc7c2f BB |
2766 | |
2767 | /* swap blkptrs */ | |
2768 | { | |
2769 | blkptr_t tmp; | |
2770 | tmp = csa->ohds->ds_phys->ds_bp; | |
2771 | csa->ohds->ds_phys->ds_bp = csa->cds->ds_phys->ds_bp; | |
2772 | csa->cds->ds_phys->ds_bp = tmp; | |
2773 | } | |
2774 | ||
2775 | /* set dd_*_bytes */ | |
2776 | { | |
2777 | int64_t dused, dcomp, duncomp; | |
2778 | uint64_t cdl_used, cdl_comp, cdl_uncomp; | |
2779 | uint64_t odl_used, odl_comp, odl_uncomp; | |
2780 | ||
b128c09f BB |
2781 | ASSERT3U(csa->cds->ds_dir->dd_phys-> |
2782 | dd_used_breakdown[DD_USED_SNAP], ==, 0); | |
2783 | ||
34dc7c2f BB |
2784 | VERIFY(0 == bplist_space(&csa->cds->ds_deadlist, &cdl_used, |
2785 | &cdl_comp, &cdl_uncomp)); | |
2786 | VERIFY(0 == bplist_space(&csa->ohds->ds_deadlist, &odl_used, | |
2787 | &odl_comp, &odl_uncomp)); | |
b128c09f | 2788 | |
34dc7c2f BB |
2789 | dused = csa->cds->ds_phys->ds_used_bytes + cdl_used - |
2790 | (csa->ohds->ds_phys->ds_used_bytes + odl_used); | |
2791 | dcomp = csa->cds->ds_phys->ds_compressed_bytes + cdl_comp - | |
2792 | (csa->ohds->ds_phys->ds_compressed_bytes + odl_comp); | |
2793 | duncomp = csa->cds->ds_phys->ds_uncompressed_bytes + | |
2794 | cdl_uncomp - | |
2795 | (csa->ohds->ds_phys->ds_uncompressed_bytes + odl_uncomp); | |
2796 | ||
b128c09f | 2797 | dsl_dir_diduse_space(csa->ohds->ds_dir, DD_USED_HEAD, |
34dc7c2f | 2798 | dused, dcomp, duncomp, tx); |
b128c09f | 2799 | dsl_dir_diduse_space(csa->cds->ds_dir, DD_USED_HEAD, |
34dc7c2f | 2800 | -dused, -dcomp, -duncomp, tx); |
b128c09f BB |
2801 | |
2802 | /* | |
2803 | * The difference in the space used by snapshots is the | |
2804 | * difference in snapshot space due to the head's | |
2805 | * deadlist (since that's the only thing that's | |
2806 | * changing that affects the snapused). | |
2807 | */ | |
2808 | VERIFY(0 == bplist_space_birthrange(&csa->cds->ds_deadlist, | |
2809 | csa->ohds->ds_origin_txg, UINT64_MAX, &cdl_used)); | |
2810 | VERIFY(0 == bplist_space_birthrange(&csa->ohds->ds_deadlist, | |
2811 | csa->ohds->ds_origin_txg, UINT64_MAX, &odl_used)); | |
2812 | dsl_dir_transfer_space(csa->ohds->ds_dir, cdl_used - odl_used, | |
2813 | DD_USED_HEAD, DD_USED_SNAP, tx); | |
34dc7c2f BB |
2814 | } |
2815 | ||
2816 | #define SWITCH64(x, y) \ | |
2817 | { \ | |
2818 | uint64_t __tmp = (x); \ | |
2819 | (x) = (y); \ | |
2820 | (y) = __tmp; \ | |
2821 | } | |
2822 | ||
2823 | /* swap ds_*_bytes */ | |
2824 | SWITCH64(csa->ohds->ds_phys->ds_used_bytes, | |
2825 | csa->cds->ds_phys->ds_used_bytes); | |
2826 | SWITCH64(csa->ohds->ds_phys->ds_compressed_bytes, | |
2827 | csa->cds->ds_phys->ds_compressed_bytes); | |
2828 | SWITCH64(csa->ohds->ds_phys->ds_uncompressed_bytes, | |
2829 | csa->cds->ds_phys->ds_uncompressed_bytes); | |
2830 | SWITCH64(csa->ohds->ds_phys->ds_unique_bytes, | |
2831 | csa->cds->ds_phys->ds_unique_bytes); | |
2832 | ||
2833 | /* apply any parent delta for change in unconsumed refreservation */ | |
b128c09f BB |
2834 | dsl_dir_diduse_space(csa->ohds->ds_dir, DD_USED_REFRSRV, |
2835 | csa->unused_refres_delta, 0, 0, tx); | |
34dc7c2f BB |
2836 | |
2837 | /* swap deadlists */ | |
2838 | bplist_close(&csa->cds->ds_deadlist); | |
2839 | bplist_close(&csa->ohds->ds_deadlist); | |
2840 | SWITCH64(csa->ohds->ds_phys->ds_deadlist_obj, | |
2841 | csa->cds->ds_phys->ds_deadlist_obj); | |
2842 | VERIFY(0 == bplist_open(&csa->cds->ds_deadlist, dp->dp_meta_objset, | |
2843 | csa->cds->ds_phys->ds_deadlist_obj)); | |
2844 | VERIFY(0 == bplist_open(&csa->ohds->ds_deadlist, dp->dp_meta_objset, | |
2845 | csa->ohds->ds_phys->ds_deadlist_obj)); | |
b128c09f BB |
2846 | |
2847 | dsl_pool_ds_clone_swapped(csa->ohds, csa->cds, tx); | |
34dc7c2f BB |
2848 | } |
2849 | ||
2850 | /* | |
b128c09f BB |
2851 | * Swap 'clone' with its origin head file system. Used at the end |
2852 | * of "online recv" to swizzle the file system to the new version. | |
34dc7c2f BB |
2853 | */ |
2854 | int | |
2855 | dsl_dataset_clone_swap(dsl_dataset_t *clone, dsl_dataset_t *origin_head, | |
2856 | boolean_t force) | |
2857 | { | |
2858 | struct cloneswaparg csa; | |
b128c09f | 2859 | int error; |
34dc7c2f | 2860 | |
b128c09f BB |
2861 | ASSERT(clone->ds_owner); |
2862 | ASSERT(origin_head->ds_owner); | |
2863 | retry: | |
2864 | /* Need exclusive access for the swap */ | |
2865 | rw_enter(&clone->ds_rwlock, RW_WRITER); | |
2866 | if (!rw_tryenter(&origin_head->ds_rwlock, RW_WRITER)) { | |
2867 | rw_exit(&clone->ds_rwlock); | |
2868 | rw_enter(&origin_head->ds_rwlock, RW_WRITER); | |
2869 | if (!rw_tryenter(&clone->ds_rwlock, RW_WRITER)) { | |
2870 | rw_exit(&origin_head->ds_rwlock); | |
2871 | goto retry; | |
2872 | } | |
2873 | } | |
34dc7c2f BB |
2874 | csa.cds = clone; |
2875 | csa.ohds = origin_head; | |
2876 | csa.force = force; | |
b128c09f | 2877 | error = dsl_sync_task_do(clone->ds_dir->dd_pool, |
34dc7c2f | 2878 | dsl_dataset_clone_swap_check, |
b128c09f BB |
2879 | dsl_dataset_clone_swap_sync, &csa, NULL, 9); |
2880 | return (error); | |
34dc7c2f BB |
2881 | } |
2882 | ||
2883 | /* | |
2884 | * Given a pool name and a dataset object number in that pool, | |
2885 | * return the name of that dataset. | |
2886 | */ | |
2887 | int | |
2888 | dsl_dsobj_to_dsname(char *pname, uint64_t obj, char *buf) | |
2889 | { | |
2890 | spa_t *spa; | |
2891 | dsl_pool_t *dp; | |
b128c09f | 2892 | dsl_dataset_t *ds; |
34dc7c2f BB |
2893 | int error; |
2894 | ||
2895 | if ((error = spa_open(pname, &spa, FTAG)) != 0) | |
2896 | return (error); | |
2897 | dp = spa_get_dsl(spa); | |
2898 | rw_enter(&dp->dp_config_rwlock, RW_READER); | |
b128c09f BB |
2899 | if ((error = dsl_dataset_hold_obj(dp, obj, FTAG, &ds)) == 0) { |
2900 | dsl_dataset_name(ds, buf); | |
2901 | dsl_dataset_rele(ds, FTAG); | |
34dc7c2f | 2902 | } |
34dc7c2f BB |
2903 | rw_exit(&dp->dp_config_rwlock); |
2904 | spa_close(spa, FTAG); | |
2905 | ||
b128c09f | 2906 | return (error); |
34dc7c2f BB |
2907 | } |
2908 | ||
2909 | int | |
2910 | dsl_dataset_check_quota(dsl_dataset_t *ds, boolean_t check_quota, | |
b128c09f | 2911 | uint64_t asize, uint64_t inflight, uint64_t *used, uint64_t *ref_rsrv) |
34dc7c2f BB |
2912 | { |
2913 | int error = 0; | |
2914 | ||
2915 | ASSERT3S(asize, >, 0); | |
2916 | ||
2917 | /* | |
2918 | * *ref_rsrv is the portion of asize that will come from any | |
2919 | * unconsumed refreservation space. | |
2920 | */ | |
2921 | *ref_rsrv = 0; | |
2922 | ||
2923 | mutex_enter(&ds->ds_lock); | |
2924 | /* | |
2925 | * Make a space adjustment for reserved bytes. | |
2926 | */ | |
2927 | if (ds->ds_reserved > ds->ds_phys->ds_unique_bytes) { | |
2928 | ASSERT3U(*used, >=, | |
2929 | ds->ds_reserved - ds->ds_phys->ds_unique_bytes); | |
2930 | *used -= (ds->ds_reserved - ds->ds_phys->ds_unique_bytes); | |
2931 | *ref_rsrv = | |
2932 | asize - MIN(asize, parent_delta(ds, asize + inflight)); | |
2933 | } | |
2934 | ||
2935 | if (!check_quota || ds->ds_quota == 0) { | |
2936 | mutex_exit(&ds->ds_lock); | |
2937 | return (0); | |
2938 | } | |
2939 | /* | |
2940 | * If they are requesting more space, and our current estimate | |
2941 | * is over quota, they get to try again unless the actual | |
2942 | * on-disk is over quota and there are no pending changes (which | |
2943 | * may free up space for us). | |
2944 | */ | |
2945 | if (ds->ds_phys->ds_used_bytes + inflight >= ds->ds_quota) { | |
2946 | if (inflight > 0 || ds->ds_phys->ds_used_bytes < ds->ds_quota) | |
2947 | error = ERESTART; | |
2948 | else | |
2949 | error = EDQUOT; | |
2950 | } | |
2951 | mutex_exit(&ds->ds_lock); | |
2952 | ||
2953 | return (error); | |
2954 | } | |
2955 | ||
2956 | /* ARGSUSED */ | |
2957 | static int | |
2958 | dsl_dataset_set_quota_check(void *arg1, void *arg2, dmu_tx_t *tx) | |
2959 | { | |
2960 | dsl_dataset_t *ds = arg1; | |
2961 | uint64_t *quotap = arg2; | |
2962 | uint64_t new_quota = *quotap; | |
2963 | ||
2964 | if (spa_version(ds->ds_dir->dd_pool->dp_spa) < SPA_VERSION_REFQUOTA) | |
2965 | return (ENOTSUP); | |
2966 | ||
2967 | if (new_quota == 0) | |
2968 | return (0); | |
2969 | ||
2970 | if (new_quota < ds->ds_phys->ds_used_bytes || | |
2971 | new_quota < ds->ds_reserved) | |
2972 | return (ENOSPC); | |
2973 | ||
2974 | return (0); | |
2975 | } | |
2976 | ||
2977 | /* ARGSUSED */ | |
2978 | void | |
2979 | dsl_dataset_set_quota_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) | |
2980 | { | |
2981 | dsl_dataset_t *ds = arg1; | |
2982 | uint64_t *quotap = arg2; | |
2983 | uint64_t new_quota = *quotap; | |
2984 | ||
2985 | dmu_buf_will_dirty(ds->ds_dbuf, tx); | |
2986 | ||
34dc7c2f | 2987 | ds->ds_quota = new_quota; |
34dc7c2f BB |
2988 | |
2989 | dsl_prop_set_uint64_sync(ds->ds_dir, "refquota", new_quota, cr, tx); | |
2990 | ||
2991 | spa_history_internal_log(LOG_DS_REFQUOTA, ds->ds_dir->dd_pool->dp_spa, | |
2992 | tx, cr, "%lld dataset = %llu ", | |
b128c09f | 2993 | (longlong_t)new_quota, ds->ds_object); |
34dc7c2f BB |
2994 | } |
2995 | ||
2996 | int | |
2997 | dsl_dataset_set_quota(const char *dsname, uint64_t quota) | |
2998 | { | |
2999 | dsl_dataset_t *ds; | |
3000 | int err; | |
3001 | ||
b128c09f | 3002 | err = dsl_dataset_hold(dsname, FTAG, &ds); |
34dc7c2f BB |
3003 | if (err) |
3004 | return (err); | |
3005 | ||
3006 | if (quota != ds->ds_quota) { | |
3007 | /* | |
3008 | * If someone removes a file, then tries to set the quota, we | |
3009 | * want to make sure the file freeing takes effect. | |
3010 | */ | |
3011 | txg_wait_open(ds->ds_dir->dd_pool, 0); | |
3012 | ||
3013 | err = dsl_sync_task_do(ds->ds_dir->dd_pool, | |
3014 | dsl_dataset_set_quota_check, dsl_dataset_set_quota_sync, | |
3015 | ds, "a, 0); | |
3016 | } | |
b128c09f | 3017 | dsl_dataset_rele(ds, FTAG); |
34dc7c2f BB |
3018 | return (err); |
3019 | } | |
3020 | ||
3021 | static int | |
3022 | dsl_dataset_set_reservation_check(void *arg1, void *arg2, dmu_tx_t *tx) | |
3023 | { | |
3024 | dsl_dataset_t *ds = arg1; | |
3025 | uint64_t *reservationp = arg2; | |
3026 | uint64_t new_reservation = *reservationp; | |
3027 | int64_t delta; | |
3028 | uint64_t unique; | |
3029 | ||
3030 | if (new_reservation > INT64_MAX) | |
3031 | return (EOVERFLOW); | |
3032 | ||
3033 | if (spa_version(ds->ds_dir->dd_pool->dp_spa) < | |
3034 | SPA_VERSION_REFRESERVATION) | |
3035 | return (ENOTSUP); | |
3036 | ||
3037 | if (dsl_dataset_is_snapshot(ds)) | |
3038 | return (EINVAL); | |
3039 | ||
3040 | /* | |
3041 | * If we are doing the preliminary check in open context, the | |
3042 | * space estimates may be inaccurate. | |
3043 | */ | |
3044 | if (!dmu_tx_is_syncing(tx)) | |
3045 | return (0); | |
3046 | ||
3047 | mutex_enter(&ds->ds_lock); | |
3048 | unique = dsl_dataset_unique(ds); | |
3049 | delta = MAX(unique, new_reservation) - MAX(unique, ds->ds_reserved); | |
3050 | mutex_exit(&ds->ds_lock); | |
3051 | ||
3052 | if (delta > 0 && | |
3053 | delta > dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) | |
3054 | return (ENOSPC); | |
3055 | if (delta > 0 && ds->ds_quota > 0 && | |
3056 | new_reservation > ds->ds_quota) | |
3057 | return (ENOSPC); | |
3058 | ||
3059 | return (0); | |
3060 | } | |
3061 | ||
3062 | /* ARGSUSED */ | |
3063 | static void | |
3064 | dsl_dataset_set_reservation_sync(void *arg1, void *arg2, cred_t *cr, | |
3065 | dmu_tx_t *tx) | |
3066 | { | |
3067 | dsl_dataset_t *ds = arg1; | |
3068 | uint64_t *reservationp = arg2; | |
3069 | uint64_t new_reservation = *reservationp; | |
3070 | uint64_t unique; | |
3071 | int64_t delta; | |
3072 | ||
3073 | dmu_buf_will_dirty(ds->ds_dbuf, tx); | |
3074 | ||
b128c09f | 3075 | mutex_enter(&ds->ds_dir->dd_lock); |
34dc7c2f BB |
3076 | mutex_enter(&ds->ds_lock); |
3077 | unique = dsl_dataset_unique(ds); | |
3078 | delta = MAX(0, (int64_t)(new_reservation - unique)) - | |
3079 | MAX(0, (int64_t)(ds->ds_reserved - unique)); | |
3080 | ds->ds_reserved = new_reservation; | |
3081 | mutex_exit(&ds->ds_lock); | |
3082 | ||
b128c09f BB |
3083 | dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, delta, 0, 0, tx); |
3084 | mutex_exit(&ds->ds_dir->dd_lock); | |
34dc7c2f BB |
3085 | dsl_prop_set_uint64_sync(ds->ds_dir, "refreservation", |
3086 | new_reservation, cr, tx); | |
3087 | ||
34dc7c2f BB |
3088 | spa_history_internal_log(LOG_DS_REFRESERV, |
3089 | ds->ds_dir->dd_pool->dp_spa, tx, cr, "%lld dataset = %llu", | |
b128c09f | 3090 | (longlong_t)new_reservation, ds->ds_object); |
34dc7c2f BB |
3091 | } |
3092 | ||
3093 | int | |
3094 | dsl_dataset_set_reservation(const char *dsname, uint64_t reservation) | |
3095 | { | |
3096 | dsl_dataset_t *ds; | |
3097 | int err; | |
3098 | ||
b128c09f | 3099 | err = dsl_dataset_hold(dsname, FTAG, &ds); |
34dc7c2f BB |
3100 | if (err) |
3101 | return (err); | |
3102 | ||
3103 | err = dsl_sync_task_do(ds->ds_dir->dd_pool, | |
3104 | dsl_dataset_set_reservation_check, | |
3105 | dsl_dataset_set_reservation_sync, ds, &reservation, 0); | |
b128c09f | 3106 | dsl_dataset_rele(ds, FTAG); |
34dc7c2f BB |
3107 | return (err); |
3108 | } |