1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
23 * Copyright (c) 2013 by Delphix. All rights reserved.
24 * Copyright (c) 2013 Martin Matuska. All rights reserved.
25 */
26
27 #include <sys/dmu.h>
28 #include <sys/dmu_objset.h>
29 #include <sys/dmu_tx.h>
30 #include <sys/dsl_dataset.h>
31 #include <sys/dsl_dir.h>
32 #include <sys/dsl_prop.h>
33 #include <sys/dsl_synctask.h>
34 #include <sys/dsl_deleg.h>
35 #include <sys/dmu_impl.h>
36 #include <sys/spa.h>
37 #include <sys/metaslab.h>
38 #include <sys/zap.h>
39 #include <sys/zio.h>
40 #include <sys/arc.h>
41 #include <sys/sunddi.h>
42 #include "zfs_namecheck.h"
43
44 static uint64_t dsl_dir_space_towrite(dsl_dir_t *dd);
45
46 /* ARGSUSED */
47 static void
48 dsl_dir_evict(dmu_buf_t *db, void *arg)
49 {
50 dsl_dir_t *dd = arg;
51 dsl_pool_t *dp = dd->dd_pool;
52 int t;
53
54 for (t = 0; t < TXG_SIZE; t++) {
55 ASSERT(!txg_list_member(&dp->dp_dirty_dirs, dd, t));
56 ASSERT(dd->dd_tempreserved[t] == 0);
57 ASSERT(dd->dd_space_towrite[t] == 0);
58 }
59
60 if (dd->dd_parent)
61 dsl_dir_rele(dd->dd_parent, dd);
62
63 spa_close(dd->dd_pool->dp_spa, dd);
64
65 /*
66 * The props callback list should have been cleaned up by
67 * objset_evict().
68 */
69 list_destroy(&dd->dd_prop_cbs);
70 mutex_destroy(&dd->dd_lock);
71 kmem_free(dd, sizeof (dsl_dir_t));
72 }
73
74 int
75 dsl_dir_hold_obj(dsl_pool_t *dp, uint64_t ddobj,
76 const char *tail, void *tag, dsl_dir_t **ddp)
77 {
78 dmu_buf_t *dbuf;
79 dsl_dir_t *dd;
80 int err;
81
82 ASSERT(dsl_pool_config_held(dp));
83
84 err = dmu_bonus_hold(dp->dp_meta_objset, ddobj, tag, &dbuf);
85 if (err != 0)
86 return (err);
87 dd = dmu_buf_get_user(dbuf);
88 #ifdef ZFS_DEBUG
89 {
90 dmu_object_info_t doi;
91 dmu_object_info_from_db(dbuf, &doi);
92 ASSERT3U(doi.doi_bonus_type, ==, DMU_OT_DSL_DIR);
93 ASSERT3U(doi.doi_bonus_size, >=, sizeof (dsl_dir_phys_t));
94 }
95 #endif
96 if (dd == NULL) {
97 dsl_dir_t *winner;
98
99 dd = kmem_zalloc(sizeof (dsl_dir_t), KM_SLEEP);
100 dd->dd_object = ddobj;
101 dd->dd_dbuf = dbuf;
102 dd->dd_pool = dp;
103 dd->dd_phys = dbuf->db_data;
104 mutex_init(&dd->dd_lock, NULL, MUTEX_DEFAULT, NULL);
105
106 list_create(&dd->dd_prop_cbs, sizeof (dsl_prop_cb_record_t),
107 offsetof(dsl_prop_cb_record_t, cbr_node));
108
109 dsl_dir_snap_cmtime_update(dd);
110
111 if (dd->dd_phys->dd_parent_obj) {
112 err = dsl_dir_hold_obj(dp, dd->dd_phys->dd_parent_obj,
113 NULL, dd, &dd->dd_parent);
114 if (err != 0)
115 goto errout;
116 if (tail) {
117 #ifdef ZFS_DEBUG
118 uint64_t foundobj;
119
120 err = zap_lookup(dp->dp_meta_objset,
121 dd->dd_parent->dd_phys->dd_child_dir_zapobj,
122 tail, sizeof (foundobj), 1, &foundobj);
123 ASSERT(err || foundobj == ddobj);
124 #endif
125 (void) strcpy(dd->dd_myname, tail);
126 } else {
127 err = zap_value_search(dp->dp_meta_objset,
128 dd->dd_parent->dd_phys->dd_child_dir_zapobj,
129 ddobj, 0, dd->dd_myname);
130 }
131 if (err != 0)
132 goto errout;
133 } else {
134 (void) strcpy(dd->dd_myname, spa_name(dp->dp_spa));
135 }
136
137 if (dsl_dir_is_clone(dd)) {
138 dmu_buf_t *origin_bonus;
139 dsl_dataset_phys_t *origin_phys;
140
141 /*
142 * We can't open the origin dataset, because
143 * that would require opening this dsl_dir.
144 * Just look at its phys directly instead.
145 */
146 err = dmu_bonus_hold(dp->dp_meta_objset,
147 dd->dd_phys->dd_origin_obj, FTAG, &origin_bonus);
148 if (err != 0)
149 goto errout;
150 origin_phys = origin_bonus->db_data;
151 dd->dd_origin_txg =
152 origin_phys->ds_creation_txg;
153 dmu_buf_rele(origin_bonus, FTAG);
154 }
155
156 winner = dmu_buf_set_user_ie(dbuf, dd, &dd->dd_phys,
157 dsl_dir_evict);
158 if (winner) {
159 if (dd->dd_parent)
160 dsl_dir_rele(dd->dd_parent, dd);
161 mutex_destroy(&dd->dd_lock);
162 kmem_free(dd, sizeof (dsl_dir_t));
163 dd = winner;
164 } else {
165 spa_open_ref(dp->dp_spa, dd);
166 }
167 }
168
169 /*
170 * The dsl_dir_t has both open-to-close and instantiate-to-evict
171 * holds on the spa. We need the open-to-close holds because
172 * otherwise the spa_refcnt wouldn't change when we open a
173 * dir which the spa also has open, so we could incorrectly
174 * think it was OK to unload/export/destroy the pool. We need
175 * the instantiate-to-evict hold because the dsl_dir_t has a
176 * pointer to the dd_pool, which has a pointer to the spa_t.
177 */
178 spa_open_ref(dp->dp_spa, tag);
179 ASSERT3P(dd->dd_pool, ==, dp);
180 ASSERT3U(dd->dd_object, ==, ddobj);
181 ASSERT3P(dd->dd_dbuf, ==, dbuf);
182 *ddp = dd;
183 return (0);
184
185 errout:
186 if (dd->dd_parent)
187 dsl_dir_rele(dd->dd_parent, dd);
188 mutex_destroy(&dd->dd_lock);
189 kmem_free(dd, sizeof (dsl_dir_t));
190 dmu_buf_rele(dbuf, tag);
191 return (err);
192 }
193
194 void
195 dsl_dir_rele(dsl_dir_t *dd, void *tag)
196 {
197 dprintf_dd(dd, "%s\n", "");
198 spa_close(dd->dd_pool->dp_spa, tag);
199 dmu_buf_rele(dd->dd_dbuf, tag);
200 }
201
202 /* buf must be long enough (MAXNAMELEN + strlen(MOS_DIR_NAME) + 1 should do) */
203 void
204 dsl_dir_name(dsl_dir_t *dd, char *buf)
205 {
206 if (dd->dd_parent) {
207 dsl_dir_name(dd->dd_parent, buf);
208 (void) strcat(buf, "/");
209 } else {
210 buf[0] = '\0';
211 }
212 if (!MUTEX_HELD(&dd->dd_lock)) {
213 /*
214 * recursive mutex so that we can use
215 * dprintf_dd() with dd_lock held
216 */
217 mutex_enter(&dd->dd_lock);
218 (void) strcat(buf, dd->dd_myname);
219 mutex_exit(&dd->dd_lock);
220 } else {
221 (void) strcat(buf, dd->dd_myname);
222 }
223 }
224
225 /* Calculate name length, avoiding all the strcat calls of dsl_dir_name */
226 int
227 dsl_dir_namelen(dsl_dir_t *dd)
228 {
229 int result = 0;
230
231 if (dd->dd_parent) {
232 /* parent's name + 1 for the "/" */
233 result = dsl_dir_namelen(dd->dd_parent) + 1;
234 }
235
236 if (!MUTEX_HELD(&dd->dd_lock)) {
237 /* see dsl_dir_name */
238 mutex_enter(&dd->dd_lock);
239 result += strlen(dd->dd_myname);
240 mutex_exit(&dd->dd_lock);
241 } else {
242 result += strlen(dd->dd_myname);
243 }
244
245 return (result);
246 }
247
248 static int
249 getcomponent(const char *path, char *component, const char **nextp)
250 {
251 char *p;
252
253 if ((path == NULL) || (path[0] == '\0'))
254 return (SET_ERROR(ENOENT));
255 /* This would be a good place to reserve some namespace... */
256 p = strpbrk(path, "/@");
257 if (p && (p[1] == '/' || p[1] == '@')) {
258 /* two separators in a row */
259 return (SET_ERROR(EINVAL));
260 }
261 if (p == NULL || p == path) {
262 /*
263 * if the first thing is an @ or /, it had better be an
264 * @ and it had better not have any more ats or slashes,
265 * and it had better have something after the @.
266 */
267 if (p != NULL &&
268 (p[0] != '@' || strpbrk(path+1, "/@") || p[1] == '\0'))
269 return (SET_ERROR(EINVAL));
270 if (strlen(path) >= MAXNAMELEN)
271 return (SET_ERROR(ENAMETOOLONG));
272 (void) strcpy(component, path);
273 p = NULL;
274 } else if (p[0] == '/') {
275 if (p - path >= MAXNAMELEN)
276 return (SET_ERROR(ENAMETOOLONG));
277 (void) strncpy(component, path, p - path);
278 component[p - path] = '\0';
279 p++;
280 } else if (p[0] == '@') {
281 /*
282 * if the next separator is an @, there better not be
283 * any more slashes.
284 */
285 if (strchr(path, '/'))
286 return (SET_ERROR(EINVAL));
287 if (p - path >= MAXNAMELEN)
288 return (SET_ERROR(ENAMETOOLONG));
289 (void) strncpy(component, path, p - path);
290 component[p - path] = '\0';
291 } else {
292 panic("invalid p=%p", (void *)p);
293 }
294 *nextp = p;
295 return (0);
296 }
297
298 /*
299 * Return the dsl_dir_t, and possibly the last component which couldn't
300 * be found in *tail. The name must be in the specified dsl_pool_t. This
301 * thread must hold the dp_config_rwlock for the pool. Returns NULL if the
302 * path is bogus, or if tail==NULL and we couldn't parse the whole name.
303 * (*tail)[0] == '@' means that the last component is a snapshot.
304 */
305 int
306 dsl_dir_hold(dsl_pool_t *dp, const char *name, void *tag,
307 dsl_dir_t **ddp, const char **tailp)
308 {
309 char buf[MAXNAMELEN];
310 const char *spaname, *next, *nextnext = NULL;
311 int err;
312 dsl_dir_t *dd;
313 uint64_t ddobj;
314
315 err = getcomponent(name, buf, &next);
316 if (err != 0)
317 return (err);
318
319 /* Make sure the name is in the specified pool. */
320 spaname = spa_name(dp->dp_spa);
321 if (strcmp(buf, spaname) != 0)
322 return (SET_ERROR(EINVAL));
323
324 ASSERT(dsl_pool_config_held(dp));
325
326 err = dsl_dir_hold_obj(dp, dp->dp_root_dir_obj, NULL, tag, &dd);
327 if (err != 0) {
328 return (err);
329 }
330
331 while (next != NULL) {
332 dsl_dir_t *child_ds;
333 err = getcomponent(next, buf, &nextnext);
334 if (err != 0)
335 break;
336 ASSERT(next[0] != '\0');
337 if (next[0] == '@')
338 break;
339 dprintf("looking up %s in obj%lld\n",
340 buf, dd->dd_phys->dd_child_dir_zapobj);
341
342 err = zap_lookup(dp->dp_meta_objset,
343 dd->dd_phys->dd_child_dir_zapobj,
344 buf, sizeof (ddobj), 1, &ddobj);
345 if (err != 0) {
346 if (err == ENOENT)
347 err = 0;
348 break;
349 }
350
351 err = dsl_dir_hold_obj(dp, ddobj, buf, tag, &child_ds);
352 if (err != 0)
353 break;
354 dsl_dir_rele(dd, tag);
355 dd = child_ds;
356 next = nextnext;
357 }
358
359 if (err != 0) {
360 dsl_dir_rele(dd, tag);
361 return (err);
362 }
363
364 /*
365 * It's an error if there's more than one component left, or
366 * tailp==NULL and there's any component left.
367 */
368 if (next != NULL &&
369 (tailp == NULL || (nextnext && nextnext[0] != '\0'))) {
370 /* bad path name */
371 dsl_dir_rele(dd, tag);
372 dprintf("next=%p (%s) tail=%p\n", next, next?next:"", tailp);
373 err = SET_ERROR(ENOENT);
374 }
375 if (tailp != NULL)
376 *tailp = next;
377 *ddp = dd;
378 return (err);
379 }
380
381 uint64_t
382 dsl_dir_create_sync(dsl_pool_t *dp, dsl_dir_t *pds, const char *name,
383 dmu_tx_t *tx)
384 {
385 objset_t *mos = dp->dp_meta_objset;
386 uint64_t ddobj;
387 dsl_dir_phys_t *ddphys;
388 dmu_buf_t *dbuf;
389
390 ddobj = dmu_object_alloc(mos, DMU_OT_DSL_DIR, 0,
391 DMU_OT_DSL_DIR, sizeof (dsl_dir_phys_t), tx);
392 if (pds) {
393 VERIFY(0 == zap_add(mos, pds->dd_phys->dd_child_dir_zapobj,
394 name, sizeof (uint64_t), 1, &ddobj, tx));
395 } else {
396 /* it's the root dir */
397 VERIFY(0 == zap_add(mos, DMU_POOL_DIRECTORY_OBJECT,
398 DMU_POOL_ROOT_DATASET, sizeof (uint64_t), 1, &ddobj, tx));
399 }
400 VERIFY(0 == dmu_bonus_hold(mos, ddobj, FTAG, &dbuf));
401 dmu_buf_will_dirty(dbuf, tx);
402 ddphys = dbuf->db_data;
403
404 ddphys->dd_creation_time = gethrestime_sec();
405 if (pds)
406 ddphys->dd_parent_obj = pds->dd_object;
407 ddphys->dd_props_zapobj = zap_create(mos,
408 DMU_OT_DSL_PROPS, DMU_OT_NONE, 0, tx);
409 ddphys->dd_child_dir_zapobj = zap_create(mos,
410 DMU_OT_DSL_DIR_CHILD_MAP, DMU_OT_NONE, 0, tx);
411 if (spa_version(dp->dp_spa) >= SPA_VERSION_USED_BREAKDOWN)
412 ddphys->dd_flags |= DD_FLAG_USED_BREAKDOWN;
413 dmu_buf_rele(dbuf, FTAG);
414
415 return (ddobj);
416 }
417
418 boolean_t
419 dsl_dir_is_clone(dsl_dir_t *dd)
420 {
421 return (dd->dd_phys->dd_origin_obj &&
422 (dd->dd_pool->dp_origin_snap == NULL ||
423 dd->dd_phys->dd_origin_obj !=
424 dd->dd_pool->dp_origin_snap->ds_object));
425 }
426
427 void
428 dsl_dir_stats(dsl_dir_t *dd, nvlist_t *nv)
429 {
430 mutex_enter(&dd->dd_lock);
431 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USED,
432 dd->dd_phys->dd_used_bytes);
433 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_QUOTA, dd->dd_phys->dd_quota);
434 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_RESERVATION,
435 dd->dd_phys->dd_reserved);
436 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_COMPRESSRATIO,
437 dd->dd_phys->dd_compressed_bytes == 0 ? 100 :
438 (dd->dd_phys->dd_uncompressed_bytes * 100 /
439 dd->dd_phys->dd_compressed_bytes));
440 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_LOGICALUSED,
441 dd->dd_phys->dd_uncompressed_bytes);
442 if (dd->dd_phys->dd_flags & DD_FLAG_USED_BREAKDOWN) {
443 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USEDSNAP,
444 dd->dd_phys->dd_used_breakdown[DD_USED_SNAP]);
445 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USEDDS,
446 dd->dd_phys->dd_used_breakdown[DD_USED_HEAD]);
447 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USEDREFRESERV,
448 dd->dd_phys->dd_used_breakdown[DD_USED_REFRSRV]);
449 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USEDCHILD,
450 dd->dd_phys->dd_used_breakdown[DD_USED_CHILD] +
451 dd->dd_phys->dd_used_breakdown[DD_USED_CHILD_RSRV]);
452 }
453 mutex_exit(&dd->dd_lock);
454
455 if (dsl_dir_is_clone(dd)) {
456 dsl_dataset_t *ds;
457 char buf[MAXNAMELEN];
458
459 VERIFY0(dsl_dataset_hold_obj(dd->dd_pool,
460 dd->dd_phys->dd_origin_obj, FTAG, &ds));
461 dsl_dataset_name(ds, buf);
462 dsl_dataset_rele(ds, FTAG);
463 dsl_prop_nvlist_add_string(nv, ZFS_PROP_ORIGIN, buf);
464 }
465 }
466
467 void
468 dsl_dir_dirty(dsl_dir_t *dd, dmu_tx_t *tx)
469 {
470 dsl_pool_t *dp = dd->dd_pool;
471
472 ASSERT(dd->dd_phys);
473
474 if (txg_list_add(&dp->dp_dirty_dirs, dd, tx->tx_txg)) {
475 /* up the hold count until we can be written out */
476 dmu_buf_add_ref(dd->dd_dbuf, dd);
477 }
478 }
479
480 static int64_t
481 parent_delta(dsl_dir_t *dd, uint64_t used, int64_t delta)
482 {
483 uint64_t old_accounted = MAX(used, dd->dd_phys->dd_reserved);
484 uint64_t new_accounted = MAX(used + delta, dd->dd_phys->dd_reserved);
485 return (new_accounted - old_accounted);
486 }
487
488 void
489 dsl_dir_sync(dsl_dir_t *dd, dmu_tx_t *tx)
490 {
491 ASSERT(dmu_tx_is_syncing(tx));
492
493 mutex_enter(&dd->dd_lock);
494 ASSERT0(dd->dd_tempreserved[tx->tx_txg&TXG_MASK]);
495 dprintf_dd(dd, "txg=%llu towrite=%lluK\n", tx->tx_txg,
496 dd->dd_space_towrite[tx->tx_txg&TXG_MASK] / 1024);
497 dd->dd_space_towrite[tx->tx_txg&TXG_MASK] = 0;
498 mutex_exit(&dd->dd_lock);
499
500 /* release the hold from dsl_dir_dirty */
501 dmu_buf_rele(dd->dd_dbuf, dd);
502 }
503
504 static uint64_t
505 dsl_dir_space_towrite(dsl_dir_t *dd)
506 {
507 uint64_t space = 0;
508 int i;
509
510 ASSERT(MUTEX_HELD(&dd->dd_lock));
511
512 for (i = 0; i < TXG_SIZE; i++) {
513 space += dd->dd_space_towrite[i&TXG_MASK];
514 ASSERT3U(dd->dd_space_towrite[i&TXG_MASK], >=, 0);
515 }
516 return (space);
517 }
518
519 /*
520 * How much space would dd have available if ancestor had delta applied
521 * to it? If ondiskonly is set, we're only interested in what's
522 * on-disk, not estimated pending changes.
523 */
524 uint64_t
525 dsl_dir_space_available(dsl_dir_t *dd,
526 dsl_dir_t *ancestor, int64_t delta, int ondiskonly)
527 {
528 uint64_t parentspace, myspace, quota, used;
529
530 /*
531 * If there are no restrictions otherwise, assume we have
532 * unlimited space available.
533 */
534 quota = UINT64_MAX;
535 parentspace = UINT64_MAX;
536
537 if (dd->dd_parent != NULL) {
538 parentspace = dsl_dir_space_available(dd->dd_parent,
539 ancestor, delta, ondiskonly);
540 }
541
542 mutex_enter(&dd->dd_lock);
543 if (dd->dd_phys->dd_quota != 0)
544 quota = dd->dd_phys->dd_quota;
545 used = dd->dd_phys->dd_used_bytes;
546 if (!ondiskonly)
547 used += dsl_dir_space_towrite(dd);
548
549 if (dd->dd_parent == NULL) {
550 uint64_t poolsize = dsl_pool_adjustedsize(dd->dd_pool, FALSE);
551 quota = MIN(quota, poolsize);
552 }
553
554 if (dd->dd_phys->dd_reserved > used && parentspace != UINT64_MAX) {
555 /*
556 * We have some space reserved, in addition to what our
557 * parent gave us.
558 */
559 parentspace += dd->dd_phys->dd_reserved - used;
560 }
561
562 if (dd == ancestor) {
563 ASSERT(delta <= 0);
564 ASSERT(used >= -delta);
565 used += delta;
566 if (parentspace != UINT64_MAX)
567 parentspace -= delta;
568 }
569
570 if (used > quota) {
571 /* over quota */
572 myspace = 0;
573 } else {
574 /*
575 * the lesser of the space provided by our parent and
576 * the space left in our quota
577 */
578 myspace = MIN(parentspace, quota - used);
579 }
580
581 mutex_exit(&dd->dd_lock);
582
583 return (myspace);
584 }
585
586 struct tempreserve {
587 list_node_t tr_node;
588 dsl_dir_t *tr_ds;
589 uint64_t tr_size;
590 };
591
592 static int
593 dsl_dir_tempreserve_impl(dsl_dir_t *dd, uint64_t asize, boolean_t netfree,
594 boolean_t ignorequota, boolean_t checkrefquota, list_t *tr_list,
595 dmu_tx_t *tx, boolean_t first)
596 {
597 uint64_t txg = tx->tx_txg;
598 uint64_t est_inflight, used_on_disk, quota, parent_rsrv;
599 uint64_t deferred = 0;
600 struct tempreserve *tr;
601 int retval = EDQUOT;
602 int txgidx = txg & TXG_MASK;
603 int i;
604 uint64_t ref_rsrv = 0;
605
606 ASSERT3U(txg, !=, 0);
607 ASSERT3S(asize, >, 0);
608
609 mutex_enter(&dd->dd_lock);
610
611 /*
612 * Check against the dsl_dir's quota. We don't add in the delta
613 * when checking for over-quota because they get one free hit.
614 */
615 est_inflight = dsl_dir_space_towrite(dd);
616 for (i = 0; i < TXG_SIZE; i++)
617 est_inflight += dd->dd_tempreserved[i];
618 used_on_disk = dd->dd_phys->dd_used_bytes;
619
620 /*
621 * On the first iteration, fetch the dataset's used-on-disk and
622 * refreservation values. Also, if checkrefquota is set, test if
623 * allocating this space would exceed the dataset's refquota.
624 */
625 if (first && tx->tx_objset) {
626 int error;
627 dsl_dataset_t *ds = tx->tx_objset->os_dsl_dataset;
628
629 error = dsl_dataset_check_quota(ds, checkrefquota,
630 asize, est_inflight, &used_on_disk, &ref_rsrv);
631 if (error) {
632 mutex_exit(&dd->dd_lock);
633 return (error);
634 }
635 }
636
637 /*
638 * If this transaction will result in a net free of space,
639 * we want to let it through.
640 */
641 if (ignorequota || netfree || dd->dd_phys->dd_quota == 0)
642 quota = UINT64_MAX;
643 else
644 quota = dd->dd_phys->dd_quota;
645
646 /*
647 * Adjust the quota against the actual pool size at the root
648 * minus any outstanding deferred frees.
649 * To ensure that it's possible to remove files from a full
650 * pool without inducing transient overcommits, we throttle
651 * netfree transactions against a quota that is slightly larger,
652 * but still within the pool's allocation slop. In cases where
653 * we're very close to full, this will allow a steady trickle of
654 * removes to get through.
655 */
656 if (dd->dd_parent == NULL) {
657 spa_t *spa = dd->dd_pool->dp_spa;
658 uint64_t poolsize = dsl_pool_adjustedsize(dd->dd_pool, netfree);
659 deferred = metaslab_class_get_deferred(spa_normal_class(spa));
660 if (poolsize - deferred < quota) {
661 quota = poolsize - deferred;
662 retval = ENOSPC;
663 }
664 }
665
666 /*
667 * If they are requesting more space, and our current estimate
668 * is over quota, they get to try again unless the actual
669 * on-disk is over quota and there are no pending changes (which
670 * may free up space for us).
671 */
672 if (used_on_disk + est_inflight >= quota) {
673 if (est_inflight > 0 || used_on_disk < quota ||
674 (retval == ENOSPC && used_on_disk < quota + deferred))
675 retval = ERESTART;
676 dprintf_dd(dd, "failing: used=%lluK inflight = %lluK "
677 "quota=%lluK tr=%lluK err=%d\n",
678 used_on_disk>>10, est_inflight>>10,
679 quota>>10, asize>>10, retval);
680 mutex_exit(&dd->dd_lock);
681 return (SET_ERROR(retval));
682 }
683
684 /* We need to up our estimated delta before dropping dd_lock */
685 dd->dd_tempreserved[txgidx] += asize;
686
687 parent_rsrv = parent_delta(dd, used_on_disk + est_inflight,
688 asize - ref_rsrv);
689 mutex_exit(&dd->dd_lock);
690
691 tr = kmem_zalloc(sizeof (struct tempreserve), KM_SLEEP);
692 tr->tr_ds = dd;
693 tr->tr_size = asize;
694 list_insert_tail(tr_list, tr);
695
696 /* see if it's OK with our parent */
697 if (dd->dd_parent && parent_rsrv) {
698 boolean_t ismos = (dd->dd_phys->dd_head_dataset_obj == 0);
699
700 return (dsl_dir_tempreserve_impl(dd->dd_parent,
701 parent_rsrv, netfree, ismos, TRUE, tr_list, tx, FALSE));
702 } else {
703 return (0);
704 }
705 }
706
707 /*
708 * Reserve space in this dsl_dir, to be used in this tx's txg.
709 * After the space has been dirtied (and dsl_dir_willuse_space()
710 * has been called), the reservation should be canceled, using
711 * dsl_dir_tempreserve_clear().
712 */
713 int
714 dsl_dir_tempreserve_space(dsl_dir_t *dd, uint64_t lsize, uint64_t asize,
715 uint64_t fsize, uint64_t usize, void **tr_cookiep, dmu_tx_t *tx)
716 {
717 int err;
718 list_t *tr_list;
719
720 if (asize == 0) {
721 *tr_cookiep = NULL;
722 return (0);
723 }
724
725 tr_list = kmem_alloc(sizeof (list_t), KM_SLEEP);
726 list_create(tr_list, sizeof (struct tempreserve),
727 offsetof(struct tempreserve, tr_node));
728 ASSERT3S(asize, >, 0);
729 ASSERT3S(fsize, >=, 0);
730
731 err = arc_tempreserve_space(lsize, tx->tx_txg);
732 if (err == 0) {
733 struct tempreserve *tr;
734
735 tr = kmem_zalloc(sizeof (struct tempreserve), KM_SLEEP);
736 tr->tr_size = lsize;
737 list_insert_tail(tr_list, tr);
738 } else {
739 if (err == EAGAIN) {
740 /*
741 * If arc_memory_throttle() detected that pageout
742 * is running and we are low on memory, we delay new
743 * non-pageout transactions to give pageout an
744 * advantage.
745 *
746 * It is unfortunate to be delaying while the caller's
747 * locks are held.
748 */
749 txg_delay(dd->dd_pool, tx->tx_txg,
750 MSEC2NSEC(10), MSEC2NSEC(10));
751 err = SET_ERROR(ERESTART);
752 }
753 }
754
755 if (err == 0) {
756 err = dsl_dir_tempreserve_impl(dd, asize, fsize >= asize,
757 FALSE, asize > usize, tr_list, tx, TRUE);
758 }
759
760 if (err != 0)
761 dsl_dir_tempreserve_clear(tr_list, tx);
762 else
763 *tr_cookiep = tr_list;
764
765 return (err);
766 }
767
768 /*
769 * Clear a temporary reservation that we previously made with
770 * dsl_dir_tempreserve_space().
771 */
772 void
773 dsl_dir_tempreserve_clear(void *tr_cookie, dmu_tx_t *tx)
774 {
775 int txgidx = tx->tx_txg & TXG_MASK;
776 list_t *tr_list = tr_cookie;
777 struct tempreserve *tr;
778
779 ASSERT3U(tx->tx_txg, !=, 0);
780
781 if (tr_cookie == NULL)
782 return;
783
784 while ((tr = list_head(tr_list)) != NULL) {
785 if (tr->tr_ds) {
786 mutex_enter(&tr->tr_ds->dd_lock);
787 ASSERT3U(tr->tr_ds->dd_tempreserved[txgidx], >=,
788 tr->tr_size);
789 tr->tr_ds->dd_tempreserved[txgidx] -= tr->tr_size;
790 mutex_exit(&tr->tr_ds->dd_lock);
791 } else {
792 arc_tempreserve_clear(tr->tr_size);
793 }
794 list_remove(tr_list, tr);
795 kmem_free(tr, sizeof (struct tempreserve));
796 }
797
798 kmem_free(tr_list, sizeof (list_t));
799 }
800
801 /*
802 * This should be called from open context when we think we're going to write
803 * or free space, for example when dirtying data. Be conservative; it's okay
804 * to write less space or free more, but we don't want to write more or free
805 * less than the amount specified.
806 */
807 void
808 dsl_dir_willuse_space(dsl_dir_t *dd, int64_t space, dmu_tx_t *tx)
809 {
810 int64_t parent_space;
811 uint64_t est_used;
812
813 mutex_enter(&dd->dd_lock);
814 if (space > 0)
815 dd->dd_space_towrite[tx->tx_txg & TXG_MASK] += space;
816
817 est_used = dsl_dir_space_towrite(dd) + dd->dd_phys->dd_used_bytes;
818 parent_space = parent_delta(dd, est_used, space);
819 mutex_exit(&dd->dd_lock);
820
821 /* Make sure that we clean up dd_space_to* */
822 dsl_dir_dirty(dd, tx);
823
824 /* XXX this is potentially expensive and unnecessary... */
825 if (parent_space && dd->dd_parent)
826 dsl_dir_willuse_space(dd->dd_parent, parent_space, tx);
827 }
828
829 /* call from syncing context when we actually write/free space for this dd */
830 void
831 dsl_dir_diduse_space(dsl_dir_t *dd, dd_used_t type,
832 int64_t used, int64_t compressed, int64_t uncompressed, dmu_tx_t *tx)
833 {
834 int64_t accounted_delta;
835
836 /*
837 * dsl_dataset_set_refreservation_sync_impl() calls this with
838 * dd_lock held, so that it can atomically update
839 * ds->ds_reserved and the dsl_dir accounting, so that
840 * dsl_dataset_check_quota() can see dataset and dir accounting
841 * consistently.
842 */
843 boolean_t needlock = !MUTEX_HELD(&dd->dd_lock);
844
845 ASSERT(dmu_tx_is_syncing(tx));
846 ASSERT(type < DD_USED_NUM);
847
848 dmu_buf_will_dirty(dd->dd_dbuf, tx);
849
850 if (needlock)
851 mutex_enter(&dd->dd_lock);
852 accounted_delta = parent_delta(dd, dd->dd_phys->dd_used_bytes, used);
853 ASSERT(used >= 0 || dd->dd_phys->dd_used_bytes >= -used);
854 ASSERT(compressed >= 0 ||
855 dd->dd_phys->dd_compressed_bytes >= -compressed);
856 ASSERT(uncompressed >= 0 ||
857 dd->dd_phys->dd_uncompressed_bytes >= -uncompressed);
858 dd->dd_phys->dd_used_bytes += used;
859 dd->dd_phys->dd_uncompressed_bytes += uncompressed;
860 dd->dd_phys->dd_compressed_bytes += compressed;
861
862 if (dd->dd_phys->dd_flags & DD_FLAG_USED_BREAKDOWN) {
863 ASSERT(used > 0 ||
864 dd->dd_phys->dd_used_breakdown[type] >= -used);
865 dd->dd_phys->dd_used_breakdown[type] += used;
866 #ifdef DEBUG
867 dd_used_t t;
868 uint64_t u = 0;
869 for (t = 0; t < DD_USED_NUM; t++)
870 u += dd->dd_phys->dd_used_breakdown[t];
871 ASSERT3U(u, ==, dd->dd_phys->dd_used_bytes);
872 #endif
873 }
874 if (needlock)
875 mutex_exit(&dd->dd_lock);
876
877 if (dd->dd_parent != NULL) {
878 dsl_dir_diduse_space(dd->dd_parent, DD_USED_CHILD,
879 accounted_delta, compressed, uncompressed, tx);
880 dsl_dir_transfer_space(dd->dd_parent,
881 used - accounted_delta,
882 DD_USED_CHILD_RSRV, DD_USED_CHILD, tx);
883 }
884 }
885
886 void
887 dsl_dir_transfer_space(dsl_dir_t *dd, int64_t delta,
888 dd_used_t oldtype, dd_used_t newtype, dmu_tx_t *tx)
889 {
890 ASSERT(dmu_tx_is_syncing(tx));
891 ASSERT(oldtype < DD_USED_NUM);
892 ASSERT(newtype < DD_USED_NUM);
893
894 if (delta == 0 || !(dd->dd_phys->dd_flags & DD_FLAG_USED_BREAKDOWN))
895 return;
896
897 dmu_buf_will_dirty(dd->dd_dbuf, tx);
898 mutex_enter(&dd->dd_lock);
899 ASSERT(delta > 0 ?
900 dd->dd_phys->dd_used_breakdown[oldtype] >= delta :
901 dd->dd_phys->dd_used_breakdown[newtype] >= -delta);
902 ASSERT(dd->dd_phys->dd_used_bytes >= ABS(delta));
903 dd->dd_phys->dd_used_breakdown[oldtype] -= delta;
904 dd->dd_phys->dd_used_breakdown[newtype] += delta;
905 mutex_exit(&dd->dd_lock);
906 }
907
908 typedef struct dsl_dir_set_qr_arg {
909 const char *ddsqra_name;
910 zprop_source_t ddsqra_source;
911 uint64_t ddsqra_value;
912 } dsl_dir_set_qr_arg_t;
913
914 static int
915 dsl_dir_set_quota_check(void *arg, dmu_tx_t *tx)
916 {
917 dsl_dir_set_qr_arg_t *ddsqra = arg;
918 dsl_pool_t *dp = dmu_tx_pool(tx);
919 dsl_dataset_t *ds;
920 int error;
921 uint64_t towrite, newval;
922
923 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds);
924 if (error != 0)
925 return (error);
926
927 error = dsl_prop_predict(ds->ds_dir, "quota",
928 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval);
929 if (error != 0) {
930 dsl_dataset_rele(ds, FTAG);
931 return (error);
932 }
933
934 if (newval == 0) {
935 dsl_dataset_rele(ds, FTAG);
936 return (0);
937 }
938
939 mutex_enter(&ds->ds_dir->dd_lock);
940 /*
941 * If we are doing the preliminary check in open context, and
942 * there are pending changes, then don't fail it, since the
943 * pending changes could under-estimate the amount of space to be
944 * freed up.
945 */
946 towrite = dsl_dir_space_towrite(ds->ds_dir);
947 if ((dmu_tx_is_syncing(tx) || towrite == 0) &&
948 (newval < ds->ds_dir->dd_phys->dd_reserved ||
949 newval < ds->ds_dir->dd_phys->dd_used_bytes + towrite)) {
950 error = SET_ERROR(ENOSPC);
951 }
952 mutex_exit(&ds->ds_dir->dd_lock);
953 dsl_dataset_rele(ds, FTAG);
954 return (error);
955 }
956
957 static void
958 dsl_dir_set_quota_sync(void *arg, dmu_tx_t *tx)
959 {
960 dsl_dir_set_qr_arg_t *ddsqra = arg;
961 dsl_pool_t *dp = dmu_tx_pool(tx);
962 dsl_dataset_t *ds;
963 uint64_t newval;
964
965 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds));
966
967 if (spa_version(dp->dp_spa) >= SPA_VERSION_RECVD_PROPS) {
968 dsl_prop_set_sync_impl(ds, zfs_prop_to_name(ZFS_PROP_QUOTA),
969 ddsqra->ddsqra_source, sizeof (ddsqra->ddsqra_value), 1,
970 &ddsqra->ddsqra_value, tx);
971
972 VERIFY0(dsl_prop_get_int_ds(ds,
973 zfs_prop_to_name(ZFS_PROP_QUOTA), &newval));
974 } else {
975 newval = ddsqra->ddsqra_value;
976 spa_history_log_internal_ds(ds, "set", tx, "%s=%lld",
977 zfs_prop_to_name(ZFS_PROP_QUOTA), (longlong_t)newval);
978 }
979
980 dmu_buf_will_dirty(ds->ds_dir->dd_dbuf, tx);
981 mutex_enter(&ds->ds_dir->dd_lock);
982 ds->ds_dir->dd_phys->dd_quota = newval;
983 mutex_exit(&ds->ds_dir->dd_lock);
984 dsl_dataset_rele(ds, FTAG);
985 }
986
987 int
988 dsl_dir_set_quota(const char *ddname, zprop_source_t source, uint64_t quota)
989 {
990 dsl_dir_set_qr_arg_t ddsqra;
991
992 ddsqra.ddsqra_name = ddname;
993 ddsqra.ddsqra_source = source;
994 ddsqra.ddsqra_value = quota;
995
996 return (dsl_sync_task(ddname, dsl_dir_set_quota_check,
997 dsl_dir_set_quota_sync, &ddsqra, 0));
998 }
999
1000 int
1001 dsl_dir_set_reservation_check(void *arg, dmu_tx_t *tx)
1002 {
1003 dsl_dir_set_qr_arg_t *ddsqra = arg;
1004 dsl_pool_t *dp = dmu_tx_pool(tx);
1005 dsl_dataset_t *ds;
1006 dsl_dir_t *dd;
1007 uint64_t newval, used, avail;
1008 int error;
1009
1010 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds);
1011 if (error != 0)
1012 return (error);
1013 dd = ds->ds_dir;
1014
1015 /*
1016 * If we are doing the preliminary check in open context, the
1017 * space estimates may be inaccurate.
1018 */
1019 if (!dmu_tx_is_syncing(tx)) {
1020 dsl_dataset_rele(ds, FTAG);
1021 return (0);
1022 }
1023
1024 error = dsl_prop_predict(ds->ds_dir,
1025 zfs_prop_to_name(ZFS_PROP_RESERVATION),
1026 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval);
1027 if (error != 0) {
1028 dsl_dataset_rele(ds, FTAG);
1029 return (error);
1030 }
1031
1032 mutex_enter(&dd->dd_lock);
1033 used = dd->dd_phys->dd_used_bytes;
1034 mutex_exit(&dd->dd_lock);
1035
1036 if (dd->dd_parent) {
1037 avail = dsl_dir_space_available(dd->dd_parent,
1038 NULL, 0, FALSE);
1039 } else {
1040 avail = dsl_pool_adjustedsize(dd->dd_pool, B_FALSE) - used;
1041 }
1042
1043 if (MAX(used, newval) > MAX(used, dd->dd_phys->dd_reserved)) {
1044 uint64_t delta = MAX(used, newval) -
1045 MAX(used, dd->dd_phys->dd_reserved);
1046
1047 if (delta > avail ||
1048 (dd->dd_phys->dd_quota > 0 &&
1049 newval > dd->dd_phys->dd_quota))
1050 error = SET_ERROR(ENOSPC);
1051 }
1052
1053 dsl_dataset_rele(ds, FTAG);
1054 return (error);
1055 }
1056
1057 void
1058 dsl_dir_set_reservation_sync_impl(dsl_dir_t *dd, uint64_t value, dmu_tx_t *tx)
1059 {
1060 uint64_t used;
1061 int64_t delta;
1062
1063 dmu_buf_will_dirty(dd->dd_dbuf, tx);
1064
1065 mutex_enter(&dd->dd_lock);
1066 used = dd->dd_phys->dd_used_bytes;
1067 delta = MAX(used, value) - MAX(used, dd->dd_phys->dd_reserved);
1068 dd->dd_phys->dd_reserved = value;
1069
1070 if (dd->dd_parent != NULL) {
1071 /* Roll up this additional usage into our ancestors */
1072 dsl_dir_diduse_space(dd->dd_parent, DD_USED_CHILD_RSRV,
1073 delta, 0, 0, tx);
1074 }
1075 mutex_exit(&dd->dd_lock);
1076 }
1077
1078
1079 static void
1080 dsl_dir_set_reservation_sync(void *arg, dmu_tx_t *tx)
1081 {
1082 dsl_dir_set_qr_arg_t *ddsqra = arg;
1083 dsl_pool_t *dp = dmu_tx_pool(tx);
1084 dsl_dataset_t *ds;
1085 uint64_t newval;
1086
1087 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds));
1088
1089 if (spa_version(dp->dp_spa) >= SPA_VERSION_RECVD_PROPS) {
1090 dsl_prop_set_sync_impl(ds,
1091 zfs_prop_to_name(ZFS_PROP_RESERVATION),
1092 ddsqra->ddsqra_source, sizeof (ddsqra->ddsqra_value), 1,
1093 &ddsqra->ddsqra_value, tx);
1094
1095 VERIFY0(dsl_prop_get_int_ds(ds,
1096 zfs_prop_to_name(ZFS_PROP_RESERVATION), &newval));
1097 } else {
1098 newval = ddsqra->ddsqra_value;
1099 spa_history_log_internal_ds(ds, "set", tx, "%s=%lld",
1100 zfs_prop_to_name(ZFS_PROP_RESERVATION),
1101 (longlong_t)newval);
1102 }
1103
1104 dsl_dir_set_reservation_sync_impl(ds->ds_dir, newval, tx);
1105 dsl_dataset_rele(ds, FTAG);
1106 }
1107
1108 int
1109 dsl_dir_set_reservation(const char *ddname, zprop_source_t source,
1110 uint64_t reservation)
1111 {
1112 dsl_dir_set_qr_arg_t ddsqra;
1113
1114 ddsqra.ddsqra_name = ddname;
1115 ddsqra.ddsqra_source = source;
1116 ddsqra.ddsqra_value = reservation;
1117
1118 return (dsl_sync_task(ddname, dsl_dir_set_reservation_check,
1119 dsl_dir_set_reservation_sync, &ddsqra, 0));
1120 }
1121
1122 static dsl_dir_t *
1123 closest_common_ancestor(dsl_dir_t *ds1, dsl_dir_t *ds2)
1124 {
1125 for (; ds1; ds1 = ds1->dd_parent) {
1126 dsl_dir_t *dd;
1127 for (dd = ds2; dd; dd = dd->dd_parent) {
1128 if (ds1 == dd)
1129 return (dd);
1130 }
1131 }
1132 return (NULL);
1133 }
1134
1135 /*
1136 * If delta is applied to dd, how much of that delta would be applied to
1137 * ancestor? Syncing context only.
1138 */
1139 static int64_t
1140 would_change(dsl_dir_t *dd, int64_t delta, dsl_dir_t *ancestor)
1141 {
1142 if (dd == ancestor)
1143 return (delta);
1144
1145 mutex_enter(&dd->dd_lock);
1146 delta = parent_delta(dd, dd->dd_phys->dd_used_bytes, delta);
1147 mutex_exit(&dd->dd_lock);
1148 return (would_change(dd->dd_parent, delta, ancestor));
1149 }
1150
1151 typedef struct dsl_dir_rename_arg {
1152 const char *ddra_oldname;
1153 const char *ddra_newname;
1154 } dsl_dir_rename_arg_t;
1155
1156 /* ARGSUSED */
1157 static int
1158 dsl_valid_rename(dsl_pool_t *dp, dsl_dataset_t *ds, void *arg)
1159 {
1160 int *deltap = arg;
1161 char namebuf[MAXNAMELEN];
1162
1163 dsl_dataset_name(ds, namebuf);
1164
1165 if (strlen(namebuf) + *deltap >= MAXNAMELEN)
1166 return (SET_ERROR(ENAMETOOLONG));
1167 return (0);
1168 }
1169
1170 static int
1171 dsl_dir_rename_check(void *arg, dmu_tx_t *tx)
1172 {
1173 dsl_dir_rename_arg_t *ddra = arg;
1174 dsl_pool_t *dp = dmu_tx_pool(tx);
1175 dsl_dir_t *dd, *newparent;
1176 const char *mynewname;
1177 int error;
1178 int delta = strlen(ddra->ddra_newname) - strlen(ddra->ddra_oldname);
1179
1180 /* target dir should exist */
1181 error = dsl_dir_hold(dp, ddra->ddra_oldname, FTAG, &dd, NULL);
1182 if (error != 0)
1183 return (error);
1184
1185 /* new parent should exist */
1186 error = dsl_dir_hold(dp, ddra->ddra_newname, FTAG,
1187 &newparent, &mynewname);
1188 if (error != 0) {
1189 dsl_dir_rele(dd, FTAG);
1190 return (error);
1191 }
1192
1193 /* can't rename to different pool */
1194 if (dd->dd_pool != newparent->dd_pool) {
1195 dsl_dir_rele(newparent, FTAG);
1196 dsl_dir_rele(dd, FTAG);
1197 return (SET_ERROR(ENXIO));
1198 }
1199
1200 /* new name should not already exist */
1201 if (mynewname == NULL) {
1202 dsl_dir_rele(newparent, FTAG);
1203 dsl_dir_rele(dd, FTAG);
1204 return (SET_ERROR(EEXIST));
1205 }
1206
1207 /* if the name length is growing, validate child name lengths */
1208 if (delta > 0) {
1209 error = dmu_objset_find_dp(dp, dd->dd_object, dsl_valid_rename,
1210 &delta, DS_FIND_CHILDREN | DS_FIND_SNAPSHOTS);
1211 if (error != 0) {
1212 dsl_dir_rele(newparent, FTAG);
1213 dsl_dir_rele(dd, FTAG);
1214 return (error);
1215 }
1216 }
1217
1218 if (newparent != dd->dd_parent) {
1219 /* is there enough space? */
1220 uint64_t myspace =
1221 MAX(dd->dd_phys->dd_used_bytes, dd->dd_phys->dd_reserved);
1222
1223 /* no rename into our descendant */
1224 if (closest_common_ancestor(dd, newparent) == dd) {
1225 dsl_dir_rele(newparent, FTAG);
1226 dsl_dir_rele(dd, FTAG);
1227 return (SET_ERROR(EINVAL));
1228 }
1229
1230 error = dsl_dir_transfer_possible(dd->dd_parent,
1231 newparent, myspace);
1232 if (error != 0) {
1233 dsl_dir_rele(newparent, FTAG);
1234 dsl_dir_rele(dd, FTAG);
1235 return (error);
1236 }
1237 }
1238
1239 dsl_dir_rele(newparent, FTAG);
1240 dsl_dir_rele(dd, FTAG);
1241 return (0);
1242 }
1243
1244 static void
1245 dsl_dir_rename_sync(void *arg, dmu_tx_t *tx)
1246 {
1247 dsl_dir_rename_arg_t *ddra = arg;
1248 dsl_pool_t *dp = dmu_tx_pool(tx);
1249 dsl_dir_t *dd, *newparent;
1250 const char *mynewname;
1251 int error;
1252 objset_t *mos = dp->dp_meta_objset;
1253
1254 VERIFY0(dsl_dir_hold(dp, ddra->ddra_oldname, FTAG, &dd, NULL));
1255 VERIFY0(dsl_dir_hold(dp, ddra->ddra_newname, FTAG, &newparent,
1256 &mynewname));
1257
1258 /* Log this before we change the name. */
1259 spa_history_log_internal_dd(dd, "rename", tx,
1260 "-> %s", ddra->ddra_newname);
1261
1262 if (newparent != dd->dd_parent) {
1263 dsl_dir_diduse_space(dd->dd_parent, DD_USED_CHILD,
1264 -dd->dd_phys->dd_used_bytes,
1265 -dd->dd_phys->dd_compressed_bytes,
1266 -dd->dd_phys->dd_uncompressed_bytes, tx);
1267 dsl_dir_diduse_space(newparent, DD_USED_CHILD,
1268 dd->dd_phys->dd_used_bytes,
1269 dd->dd_phys->dd_compressed_bytes,
1270 dd->dd_phys->dd_uncompressed_bytes, tx);
1271
1272 if (dd->dd_phys->dd_reserved > dd->dd_phys->dd_used_bytes) {
1273 uint64_t unused_rsrv = dd->dd_phys->dd_reserved -
1274 dd->dd_phys->dd_used_bytes;
1275
1276 dsl_dir_diduse_space(dd->dd_parent, DD_USED_CHILD_RSRV,
1277 -unused_rsrv, 0, 0, tx);
1278 dsl_dir_diduse_space(newparent, DD_USED_CHILD_RSRV,
1279 unused_rsrv, 0, 0, tx);
1280 }
1281 }
1282
1283 dmu_buf_will_dirty(dd->dd_dbuf, tx);
1284
1285 /* remove from old parent zapobj */
1286 error = zap_remove(mos, dd->dd_parent->dd_phys->dd_child_dir_zapobj,
1287 dd->dd_myname, tx);
1288 ASSERT0(error);
1289
1290 (void) strcpy(dd->dd_myname, mynewname);
1291 dsl_dir_rele(dd->dd_parent, dd);
1292 dd->dd_phys->dd_parent_obj = newparent->dd_object;
1293 VERIFY0(dsl_dir_hold_obj(dp,
1294 newparent->dd_object, NULL, dd, &dd->dd_parent));
1295
1296 /* add to new parent zapobj */
1297 VERIFY0(zap_add(mos, newparent->dd_phys->dd_child_dir_zapobj,
1298 dd->dd_myname, 8, 1, &dd->dd_object, tx));
1299
1300 dsl_prop_notify_all(dd);
1301
1302 dsl_dir_rele(newparent, FTAG);
1303 dsl_dir_rele(dd, FTAG);
1304 }
1305
1306 int
1307 dsl_dir_rename(const char *oldname, const char *newname)
1308 {
1309 dsl_dir_rename_arg_t ddra;
1310
1311 ddra.ddra_oldname = oldname;
1312 ddra.ddra_newname = newname;
1313
1314 return (dsl_sync_task(oldname,
1315 dsl_dir_rename_check, dsl_dir_rename_sync, &ddra, 3));
1316 }
1317
1318 int
1319 dsl_dir_transfer_possible(dsl_dir_t *sdd, dsl_dir_t *tdd, uint64_t space)
1320 {
1321 dsl_dir_t *ancestor;
1322 int64_t adelta;
1323 uint64_t avail;
1324
1325 ancestor = closest_common_ancestor(sdd, tdd);
1326 adelta = would_change(sdd, -space, ancestor);
1327 avail = dsl_dir_space_available(tdd, ancestor, adelta, FALSE);
1328 if (avail < space)
1329 return (SET_ERROR(ENOSPC));
1330
1331 return (0);
1332 }
1333
1334 timestruc_t
1335 dsl_dir_snap_cmtime(dsl_dir_t *dd)
1336 {
1337 timestruc_t t;
1338
1339 mutex_enter(&dd->dd_lock);
1340 t = dd->dd_snap_cmtime;
1341 mutex_exit(&dd->dd_lock);
1342
1343 return (t);
1344 }
1345
1346 void
1347 dsl_dir_snap_cmtime_update(dsl_dir_t *dd)
1348 {
1349 timestruc_t t;
1350
1351 gethrestime(&t);
1352 mutex_enter(&dd->dd_lock);
1353 dd->dd_snap_cmtime = t;
1354 mutex_exit(&dd->dd_lock);
1355 }
1356
1357 void
1358 dsl_dir_zapify(dsl_dir_t *dd, dmu_tx_t *tx)
1359 {
1360 objset_t *mos = dd->dd_pool->dp_meta_objset;
1361 dmu_object_zapify(mos, dd->dd_object, DMU_OT_DSL_DIR, tx);
1362 }