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1949 crash during reguid causes stale config
[unleashed.git] / usr / src / uts / common / fs / zfs / dsl_dir.c
blob1cd49c8274e8ebcdfb1c6222aa082a075672ccbc
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 */
24
25 #include <sys/dmu.h>
26 #include <sys/dmu_objset.h>
27 #include <sys/dmu_tx.h>
28 #include <sys/dsl_dataset.h>
29 #include <sys/dsl_dir.h>
30 #include <sys/dsl_prop.h>
31 #include <sys/dsl_synctask.h>
32 #include <sys/dsl_deleg.h>
33 #include <sys/spa.h>
34 #include <sys/metaslab.h>
35 #include <sys/zap.h>
36 #include <sys/zio.h>
37 #include <sys/arc.h>
38 #include <sys/sunddi.h>
39 #include "zfs_namecheck.h"
40
41 static uint64_t dsl_dir_space_towrite(dsl_dir_t *dd);
42 static void dsl_dir_set_reservation_sync(void *arg1, void *arg2, dmu_tx_t *tx);
43
44
45 /* ARGSUSED */
46 static void
47 dsl_dir_evict(dmu_buf_t *db, void *arg)
48 {
49 dsl_dir_t *dd = arg;
50 dsl_pool_t *dp = dd->dd_pool;
51 int t;
52
53 for (t = 0; t < TXG_SIZE; t++) {
54 ASSERT(!txg_list_member(&dp->dp_dirty_dirs, dd, t));
55 ASSERT(dd->dd_tempreserved[t] == 0);
56 ASSERT(dd->dd_space_towrite[t] == 0);
57 }
58
59 if (dd->dd_parent)
60 dsl_dir_close(dd->dd_parent, dd);
61
62 spa_close(dd->dd_pool->dp_spa, dd);
63
64 /*
65 * The props callback list should have been cleaned up by
66 * objset_evict().
67 */
68 list_destroy(&dd->dd_prop_cbs);
69 mutex_destroy(&dd->dd_lock);
70 kmem_free(dd, sizeof (dsl_dir_t));
71 }
72
73 int
74 dsl_dir_open_obj(dsl_pool_t *dp, uint64_t ddobj,
75 const char *tail, void *tag, dsl_dir_t **ddp)
76 {
77 dmu_buf_t *dbuf;
78 dsl_dir_t *dd;
79 int err;
80
81 ASSERT(RW_LOCK_HELD(&dp->dp_config_rwlock) ||
82 dsl_pool_sync_context(dp));
83
84 err = dmu_bonus_hold(dp->dp_meta_objset, ddobj, tag, &dbuf);
85 if (err)
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_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_open_obj(dp, dd->dd_phys->dd_parent_obj,
113 NULL, dd, &dd->dd_parent);
114 if (err)
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)
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)
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_close(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_close(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
195 void
196 dsl_dir_close(dsl_dir_t *dd, void *tag)
197 {
198 dprintf_dd(dd, "%s\n", "");
199 spa_close(dd->dd_pool->dp_spa, tag);
200 dmu_buf_rele(dd->dd_dbuf, tag);
201 }
202
203 /* buf must be long enough (MAXNAMELEN + strlen(MOS_DIR_NAME) + 1 should do) */
204 void
205 dsl_dir_name(dsl_dir_t *dd, char *buf)
206 {
207 if (dd->dd_parent) {
208 dsl_dir_name(dd->dd_parent, buf);
209 (void) strcat(buf, "/");
210 } else {
211 buf[0] = '\0';
212 }
213 if (!MUTEX_HELD(&dd->dd_lock)) {
214 /*
215 * recursive mutex so that we can use
216 * dprintf_dd() with dd_lock held
217 */
218 mutex_enter(&dd->dd_lock);
219 (void) strcat(buf, dd->dd_myname);
220 mutex_exit(&dd->dd_lock);
221 } else {
222 (void) strcat(buf, dd->dd_myname);
223 }
224 }
225
226 /* Calculate name legnth, avoiding all the strcat calls of dsl_dir_name */
227 int
228 dsl_dir_namelen(dsl_dir_t *dd)
229 {
230 int result = 0;
231
232 if (dd->dd_parent) {
233 /* parent's name + 1 for the "/" */
234 result = dsl_dir_namelen(dd->dd_parent) + 1;
235 }
236
237 if (!MUTEX_HELD(&dd->dd_lock)) {
238 /* see dsl_dir_name */
239 mutex_enter(&dd->dd_lock);
240 result += strlen(dd->dd_myname);
241 mutex_exit(&dd->dd_lock);
242 } else {
243 result += strlen(dd->dd_myname);
244 }
245
246 return (result);
247 }
248
249 static int
250 getcomponent(const char *path, char *component, const char **nextp)
251 {
252 char *p;
253 if ((path == NULL) || (path[0] == '\0'))
254 return (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 (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 (EINVAL);
270 if (strlen(path) >= MAXNAMELEN)
271 return (ENAMETOOLONG);
272 (void) strcpy(component, path);
273 p = NULL;
274 } else if (p[0] == '/') {
275 if (p-path >= MAXNAMELEN)
276 return (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 (EINVAL);
287 if (p-path >= MAXNAMELEN)
288 return (ENAMETOOLONG);
289 (void) strncpy(component, path, p - path);
290 component[p-path] = '\0';
291 } else {
292 ASSERT(!"invalid p");
293 }
294 *nextp = p;
295 return (0);
296 }
297
298 /*
299 * same as dsl_open_dir, ignore the first component of name and use the
300 * spa instead
301 */
302 int
303 dsl_dir_open_spa(spa_t *spa, const char *name, void *tag,
304 dsl_dir_t **ddp, const char **tailp)
305 {
306 char buf[MAXNAMELEN];
307 const char *next, *nextnext = NULL;
308 int err;
309 dsl_dir_t *dd;
310 dsl_pool_t *dp;
311 uint64_t ddobj;
312 int openedspa = FALSE;
313
314 dprintf("%s\n", name);
315
316 err = getcomponent(name, buf, &next);
317 if (err)
318 return (err);
319 if (spa == NULL) {
320 err = spa_open(buf, &spa, FTAG);
321 if (err) {
322 dprintf("spa_open(%s) failed\n", buf);
323 return (err);
324 }
325 openedspa = TRUE;
326
327 /* XXX this assertion belongs in spa_open */
328 ASSERT(!dsl_pool_sync_context(spa_get_dsl(spa)));
329 }
330
331 dp = spa_get_dsl(spa);
332
333 rw_enter(&dp->dp_config_rwlock, RW_READER);
334 err = dsl_dir_open_obj(dp, dp->dp_root_dir_obj, NULL, tag, &dd);
335 if (err) {
336 rw_exit(&dp->dp_config_rwlock);
337 if (openedspa)
338 spa_close(spa, FTAG);
339 return (err);
340 }
341
342 while (next != NULL) {
343 dsl_dir_t *child_ds;
344 err = getcomponent(next, buf, &nextnext);
345 if (err)
346 break;
347 ASSERT(next[0] != '\0');
348 if (next[0] == '@')
349 break;
350 dprintf("looking up %s in obj%lld\n",
351 buf, dd->dd_phys->dd_child_dir_zapobj);
352
353 err = zap_lookup(dp->dp_meta_objset,
354 dd->dd_phys->dd_child_dir_zapobj,
355 buf, sizeof (ddobj), 1, &ddobj);
356 if (err) {
357 if (err == ENOENT)
358 err = 0;
359 break;
360 }
361
362 err = dsl_dir_open_obj(dp, ddobj, buf, tag, &child_ds);
363 if (err)
364 break;
365 dsl_dir_close(dd, tag);
366 dd = child_ds;
367 next = nextnext;
368 }
369 rw_exit(&dp->dp_config_rwlock);
370
371 if (err) {
372 dsl_dir_close(dd, tag);
373 if (openedspa)
374 spa_close(spa, FTAG);
375 return (err);
376 }
377
378 /*
379 * It's an error if there's more than one component left, or
380 * tailp==NULL and there's any component left.
381 */
382 if (next != NULL &&
383 (tailp == NULL || (nextnext && nextnext[0] != '\0'))) {
384 /* bad path name */
385 dsl_dir_close(dd, tag);
386 dprintf("next=%p (%s) tail=%p\n", next, next?next:"", tailp);
387 err = ENOENT;
388 }
389 if (tailp)
390 *tailp = next;
391 if (openedspa)
392 spa_close(spa, FTAG);
393 *ddp = dd;
394 return (err);
395 }
396
397 /*
398 * Return the dsl_dir_t, and possibly the last component which couldn't
399 * be found in *tail. Return NULL if the path is bogus, or if
400 * tail==NULL and we couldn't parse the whole name. (*tail)[0] == '@'
401 * means that the last component is a snapshot.
402 */
403 int
404 dsl_dir_open(const char *name, void *tag, dsl_dir_t **ddp, const char **tailp)
405 {
406 return (dsl_dir_open_spa(NULL, name, tag, ddp, tailp));
407 }
408
409 uint64_t
410 dsl_dir_create_sync(dsl_pool_t *dp, dsl_dir_t *pds, const char *name,
411 dmu_tx_t *tx)
412 {
413 objset_t *mos = dp->dp_meta_objset;
414 uint64_t ddobj;
415 dsl_dir_phys_t *ddphys;
416 dmu_buf_t *dbuf;
417
418 ddobj = dmu_object_alloc(mos, DMU_OT_DSL_DIR, 0,
419 DMU_OT_DSL_DIR, sizeof (dsl_dir_phys_t), tx);
420 if (pds) {
421 VERIFY(0 == zap_add(mos, pds->dd_phys->dd_child_dir_zapobj,
422 name, sizeof (uint64_t), 1, &ddobj, tx));
423 } else {
424 /* it's the root dir */
425 VERIFY(0 == zap_add(mos, DMU_POOL_DIRECTORY_OBJECT,
426 DMU_POOL_ROOT_DATASET, sizeof (uint64_t), 1, &ddobj, tx));
427 }
428 VERIFY(0 == dmu_bonus_hold(mos, ddobj, FTAG, &dbuf));
429 dmu_buf_will_dirty(dbuf, tx);
430 ddphys = dbuf->db_data;
431
432 ddphys->dd_creation_time = gethrestime_sec();
433 if (pds)
434 ddphys->dd_parent_obj = pds->dd_object;
435 ddphys->dd_props_zapobj = zap_create(mos,
436 DMU_OT_DSL_PROPS, DMU_OT_NONE, 0, tx);
437 ddphys->dd_child_dir_zapobj = zap_create(mos,
438 DMU_OT_DSL_DIR_CHILD_MAP, DMU_OT_NONE, 0, tx);
439 if (spa_version(dp->dp_spa) >= SPA_VERSION_USED_BREAKDOWN)
440 ddphys->dd_flags |= DD_FLAG_USED_BREAKDOWN;
441 dmu_buf_rele(dbuf, FTAG);
442
443 return (ddobj);
444 }
445
446 /* ARGSUSED */
447 int
448 dsl_dir_destroy_check(void *arg1, void *arg2, dmu_tx_t *tx)
449 {
450 dsl_dataset_t *ds = arg1;
451 dsl_dir_t *dd = ds->ds_dir;
452 dsl_pool_t *dp = dd->dd_pool;
453 objset_t *mos = dp->dp_meta_objset;
454 int err;
455 uint64_t count;
456
457 /*
458 * There should be exactly two holds, both from
459 * dsl_dataset_destroy: one on the dd directory, and one on its
460 * head ds. Otherwise, someone is trying to lookup something
461 * inside this dir while we want to destroy it. The
462 * config_rwlock ensures that nobody else opens it after we
463 * check.
464 */
465 if (dmu_buf_refcount(dd->dd_dbuf) > 2)
466 return (EBUSY);
467
468 err = zap_count(mos, dd->dd_phys->dd_child_dir_zapobj, &count);
469 if (err)
470 return (err);
471 if (count != 0)
472 return (EEXIST);
473
474 return (0);
475 }
476
477 void
478 dsl_dir_destroy_sync(void *arg1, void *tag, dmu_tx_t *tx)
479 {
480 dsl_dataset_t *ds = arg1;
481 dsl_dir_t *dd = ds->ds_dir;
482 objset_t *mos = dd->dd_pool->dp_meta_objset;
483 dsl_prop_setarg_t psa;
484 uint64_t value = 0;
485 uint64_t obj;
486 dd_used_t t;
487
488 ASSERT(RW_WRITE_HELD(&dd->dd_pool->dp_config_rwlock));
489 ASSERT(dd->dd_phys->dd_head_dataset_obj == 0);
490
491 /* Remove our reservation. */
492 dsl_prop_setarg_init_uint64(&psa, "reservation",
493 (ZPROP_SRC_NONE | ZPROP_SRC_LOCAL | ZPROP_SRC_RECEIVED),
494 &value);
495 psa.psa_effective_value = 0; /* predict default value */
496
497 dsl_dir_set_reservation_sync(ds, &psa, tx);
498
499 ASSERT3U(dd->dd_phys->dd_used_bytes, ==, 0);
500 ASSERT3U(dd->dd_phys->dd_reserved, ==, 0);
501 for (t = 0; t < DD_USED_NUM; t++)
502 ASSERT3U(dd->dd_phys->dd_used_breakdown[t], ==, 0);
503
504 VERIFY(0 == zap_destroy(mos, dd->dd_phys->dd_child_dir_zapobj, tx));
505 VERIFY(0 == zap_destroy(mos, dd->dd_phys->dd_props_zapobj, tx));
506 VERIFY(0 == dsl_deleg_destroy(mos, dd->dd_phys->dd_deleg_zapobj, tx));
507 VERIFY(0 == zap_remove(mos,
508 dd->dd_parent->dd_phys->dd_child_dir_zapobj, dd->dd_myname, tx));
509
510 obj = dd->dd_object;
511 dsl_dir_close(dd, tag);
512 VERIFY(0 == dmu_object_free(mos, obj, tx));
513 }
514
515 boolean_t
516 dsl_dir_is_clone(dsl_dir_t *dd)
517 {
518 return (dd->dd_phys->dd_origin_obj &&
519 (dd->dd_pool->dp_origin_snap == NULL ||
520 dd->dd_phys->dd_origin_obj !=
521 dd->dd_pool->dp_origin_snap->ds_object));
522 }
523
524 void
525 dsl_dir_stats(dsl_dir_t *dd, nvlist_t *nv)
526 {
527 mutex_enter(&dd->dd_lock);
528 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USED,
529 dd->dd_phys->dd_used_bytes);
530 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_QUOTA, dd->dd_phys->dd_quota);
531 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_RESERVATION,
532 dd->dd_phys->dd_reserved);
533 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_COMPRESSRATIO,
534 dd->dd_phys->dd_compressed_bytes == 0 ? 100 :
535 (dd->dd_phys->dd_uncompressed_bytes * 100 /
536 dd->dd_phys->dd_compressed_bytes));
537 if (dd->dd_phys->dd_flags & DD_FLAG_USED_BREAKDOWN) {
538 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USEDSNAP,
539 dd->dd_phys->dd_used_breakdown[DD_USED_SNAP]);
540 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USEDDS,
541 dd->dd_phys->dd_used_breakdown[DD_USED_HEAD]);
542 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USEDREFRESERV,
543 dd->dd_phys->dd_used_breakdown[DD_USED_REFRSRV]);
544 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USEDCHILD,
545 dd->dd_phys->dd_used_breakdown[DD_USED_CHILD] +
546 dd->dd_phys->dd_used_breakdown[DD_USED_CHILD_RSRV]);
547 }
548 mutex_exit(&dd->dd_lock);
549
550 rw_enter(&dd->dd_pool->dp_config_rwlock, RW_READER);
551 if (dsl_dir_is_clone(dd)) {
552 dsl_dataset_t *ds;
553 char buf[MAXNAMELEN];
554
555 VERIFY(0 == dsl_dataset_hold_obj(dd->dd_pool,
556 dd->dd_phys->dd_origin_obj, FTAG, &ds));
557 dsl_dataset_name(ds, buf);
558 dsl_dataset_rele(ds, FTAG);
559 dsl_prop_nvlist_add_string(nv, ZFS_PROP_ORIGIN, buf);
560 }
561 rw_exit(&dd->dd_pool->dp_config_rwlock);
562 }
563
564 void
565 dsl_dir_dirty(dsl_dir_t *dd, dmu_tx_t *tx)
566 {
567 dsl_pool_t *dp = dd->dd_pool;
568
569 ASSERT(dd->dd_phys);
570
571 if (txg_list_add(&dp->dp_dirty_dirs, dd, tx->tx_txg) == 0) {
572 /* up the hold count until we can be written out */
573 dmu_buf_add_ref(dd->dd_dbuf, dd);
574 }
575 }
576
577 static int64_t
578 parent_delta(dsl_dir_t *dd, uint64_t used, int64_t delta)
579 {
580 uint64_t old_accounted = MAX(used, dd->dd_phys->dd_reserved);
581 uint64_t new_accounted = MAX(used + delta, dd->dd_phys->dd_reserved);
582 return (new_accounted - old_accounted);
583 }
584
585 void
586 dsl_dir_sync(dsl_dir_t *dd, dmu_tx_t *tx)
587 {
588 ASSERT(dmu_tx_is_syncing(tx));
589
590 dmu_buf_will_dirty(dd->dd_dbuf, tx);
591
592 mutex_enter(&dd->dd_lock);
593 ASSERT3U(dd->dd_tempreserved[tx->tx_txg&TXG_MASK], ==, 0);
594 dprintf_dd(dd, "txg=%llu towrite=%lluK\n", tx->tx_txg,
595 dd->dd_space_towrite[tx->tx_txg&TXG_MASK] / 1024);
596 dd->dd_space_towrite[tx->tx_txg&TXG_MASK] = 0;
597 mutex_exit(&dd->dd_lock);
598
599 /* release the hold from dsl_dir_dirty */
600 dmu_buf_rele(dd->dd_dbuf, dd);
601 }
602
603 static uint64_t
604 dsl_dir_space_towrite(dsl_dir_t *dd)
605 {
606 uint64_t space = 0;
607 int i;
608
609 ASSERT(MUTEX_HELD(&dd->dd_lock));
610
611 for (i = 0; i < TXG_SIZE; i++) {
612 space += dd->dd_space_towrite[i&TXG_MASK];
613 ASSERT3U(dd->dd_space_towrite[i&TXG_MASK], >=, 0);
614 }
615 return (space);
616 }
617
618 /*
619 * How much space would dd have available if ancestor had delta applied
620 * to it? If ondiskonly is set, we're only interested in what's
621 * on-disk, not estimated pending changes.
622 */
623 uint64_t
624 dsl_dir_space_available(dsl_dir_t *dd,
625 dsl_dir_t *ancestor, int64_t delta, int ondiskonly)
626 {
627 uint64_t parentspace, myspace, quota, used;
628
629 /*
630 * If there are no restrictions otherwise, assume we have
631 * unlimited space available.
632 */
633 quota = UINT64_MAX;
634 parentspace = UINT64_MAX;
635
636 if (dd->dd_parent != NULL) {
637 parentspace = dsl_dir_space_available(dd->dd_parent,
638 ancestor, delta, ondiskonly);
639 }
640
641 mutex_enter(&dd->dd_lock);
642 if (dd->dd_phys->dd_quota != 0)
643 quota = dd->dd_phys->dd_quota;
644 used = dd->dd_phys->dd_used_bytes;
645 if (!ondiskonly)
646 used += dsl_dir_space_towrite(dd);
647
648 if (dd->dd_parent == NULL) {
649 uint64_t poolsize = dsl_pool_adjustedsize(dd->dd_pool, FALSE);
650 quota = MIN(quota, poolsize);
651 }
652
653 if (dd->dd_phys->dd_reserved > used && parentspace != UINT64_MAX) {
654 /*
655 * We have some space reserved, in addition to what our
656 * parent gave us.
657 */
658 parentspace += dd->dd_phys->dd_reserved - used;
659 }
660
661 if (dd == ancestor) {
662 ASSERT(delta <= 0);
663 ASSERT(used >= -delta);
664 used += delta;
665 if (parentspace != UINT64_MAX)
666 parentspace -= delta;
667 }
668
669 if (used > quota) {
670 /* over quota */
671 myspace = 0;
672 } else {
673 /*
674 * the lesser of the space provided by our parent and
675 * the space left in our quota
676 */
677 myspace = MIN(parentspace, quota - used);
678 }
679
680 mutex_exit(&dd->dd_lock);
681
682 return (myspace);
683 }
684
685 struct tempreserve {
686 list_node_t tr_node;
687 dsl_pool_t *tr_dp;
688 dsl_dir_t *tr_ds;
689 uint64_t tr_size;
690 };
691
692 static int
693 dsl_dir_tempreserve_impl(dsl_dir_t *dd, uint64_t asize, boolean_t netfree,
694 boolean_t ignorequota, boolean_t checkrefquota, list_t *tr_list,
695 dmu_tx_t *tx, boolean_t first)
696 {
697 uint64_t txg = tx->tx_txg;
698 uint64_t est_inflight, used_on_disk, quota, parent_rsrv;
699 uint64_t deferred = 0;
700 struct tempreserve *tr;
701 int retval = EDQUOT;
702 int txgidx = txg & TXG_MASK;
703 int i;
704 uint64_t ref_rsrv = 0;
705
706 ASSERT3U(txg, !=, 0);
707 ASSERT3S(asize, >, 0);
708
709 mutex_enter(&dd->dd_lock);
710
711 /*
712 * Check against the dsl_dir's quota. We don't add in the delta
713 * when checking for over-quota because they get one free hit.
714 */
715 est_inflight = dsl_dir_space_towrite(dd);
716 for (i = 0; i < TXG_SIZE; i++)
717 est_inflight += dd->dd_tempreserved[i];
718 used_on_disk = dd->dd_phys->dd_used_bytes;
719
720 /*
721 * On the first iteration, fetch the dataset's used-on-disk and
722 * refreservation values. Also, if checkrefquota is set, test if
723 * allocating this space would exceed the dataset's refquota.
724 */
725 if (first && tx->tx_objset) {
726 int error;
727 dsl_dataset_t *ds = tx->tx_objset->os_dsl_dataset;
728
729 error = dsl_dataset_check_quota(ds, checkrefquota,
730 asize, est_inflight, &used_on_disk, &ref_rsrv);
731 if (error) {
732 mutex_exit(&dd->dd_lock);
733 return (error);
734 }
735 }
736
737 /*
738 * If this transaction will result in a net free of space,
739 * we want to let it through.
740 */
741 if (ignorequota || netfree || dd->dd_phys->dd_quota == 0)
742 quota = UINT64_MAX;
743 else
744 quota = dd->dd_phys->dd_quota;
745
746 /*
747 * Adjust the quota against the actual pool size at the root
748 * minus any outstanding deferred frees.
749 * To ensure that it's possible to remove files from a full
750 * pool without inducing transient overcommits, we throttle
751 * netfree transactions against a quota that is slightly larger,
752 * but still within the pool's allocation slop. In cases where
753 * we're very close to full, this will allow a steady trickle of
754 * removes to get through.
755 */
756 if (dd->dd_parent == NULL) {
757 spa_t *spa = dd->dd_pool->dp_spa;
758 uint64_t poolsize = dsl_pool_adjustedsize(dd->dd_pool, netfree);
759 deferred = metaslab_class_get_deferred(spa_normal_class(spa));
760 if (poolsize - deferred < quota) {
761 quota = poolsize - deferred;
762 retval = ENOSPC;
763 }
764 }
765
766 /*
767 * If they are requesting more space, and our current estimate
768 * is over quota, they get to try again unless the actual
769 * on-disk is over quota and there are no pending changes (which
770 * may free up space for us).
771 */
772 if (used_on_disk + est_inflight >= quota) {
773 if (est_inflight > 0 || used_on_disk < quota ||
774 (retval == ENOSPC && used_on_disk < quota + deferred))
775 retval = ERESTART;
776 dprintf_dd(dd, "failing: used=%lluK inflight = %lluK "
777 "quota=%lluK tr=%lluK err=%d\n",
778 used_on_disk>>10, est_inflight>>10,
779 quota>>10, asize>>10, retval);
780 mutex_exit(&dd->dd_lock);
781 return (retval);
782 }
783
784 /* We need to up our estimated delta before dropping dd_lock */
785 dd->dd_tempreserved[txgidx] += asize;
786
787 parent_rsrv = parent_delta(dd, used_on_disk + est_inflight,
788 asize - ref_rsrv);
789 mutex_exit(&dd->dd_lock);
790
791 tr = kmem_zalloc(sizeof (struct tempreserve), KM_SLEEP);
792 tr->tr_ds = dd;
793 tr->tr_size = asize;
794 list_insert_tail(tr_list, tr);
795
796 /* see if it's OK with our parent */
797 if (dd->dd_parent && parent_rsrv) {
798 boolean_t ismos = (dd->dd_phys->dd_head_dataset_obj == 0);
799
800 return (dsl_dir_tempreserve_impl(dd->dd_parent,
801 parent_rsrv, netfree, ismos, TRUE, tr_list, tx, FALSE));
802 } else {
803 return (0);
804 }
805 }
806
807 /*
808 * Reserve space in this dsl_dir, to be used in this tx's txg.
809 * After the space has been dirtied (and dsl_dir_willuse_space()
810 * has been called), the reservation should be canceled, using
811 * dsl_dir_tempreserve_clear().
812 */
813 int
814 dsl_dir_tempreserve_space(dsl_dir_t *dd, uint64_t lsize, uint64_t asize,
815 uint64_t fsize, uint64_t usize, void **tr_cookiep, dmu_tx_t *tx)
816 {
817 int err;
818 list_t *tr_list;
819
820 if (asize == 0) {
821 *tr_cookiep = NULL;
822 return (0);
823 }
824
825 tr_list = kmem_alloc(sizeof (list_t), KM_SLEEP);
826 list_create(tr_list, sizeof (struct tempreserve),
827 offsetof(struct tempreserve, tr_node));
828 ASSERT3S(asize, >, 0);
829 ASSERT3S(fsize, >=, 0);
830
831 err = arc_tempreserve_space(lsize, tx->tx_txg);
832 if (err == 0) {
833 struct tempreserve *tr;
834
835 tr = kmem_zalloc(sizeof (struct tempreserve), KM_SLEEP);
836 tr->tr_size = lsize;
837 list_insert_tail(tr_list, tr);
838
839 err = dsl_pool_tempreserve_space(dd->dd_pool, asize, tx);
840 } else {
841 if (err == EAGAIN) {
842 txg_delay(dd->dd_pool, tx->tx_txg, 1);
843 err = ERESTART;
844 }
845 dsl_pool_memory_pressure(dd->dd_pool);
846 }
847
848 if (err == 0) {
849 struct tempreserve *tr;
850
851 tr = kmem_zalloc(sizeof (struct tempreserve), KM_SLEEP);
852 tr->tr_dp = dd->dd_pool;
853 tr->tr_size = asize;
854 list_insert_tail(tr_list, tr);
855
856 err = dsl_dir_tempreserve_impl(dd, asize, fsize >= asize,
857 FALSE, asize > usize, tr_list, tx, TRUE);
858 }
859
860 if (err)
861 dsl_dir_tempreserve_clear(tr_list, tx);
862 else
863 *tr_cookiep = tr_list;
864
865 return (err);
866 }
867
868 /*
869 * Clear a temporary reservation that we previously made with
870 * dsl_dir_tempreserve_space().
871 */
872 void
873 dsl_dir_tempreserve_clear(void *tr_cookie, dmu_tx_t *tx)
874 {
875 int txgidx = tx->tx_txg & TXG_MASK;
876 list_t *tr_list = tr_cookie;
877 struct tempreserve *tr;
878
879 ASSERT3U(tx->tx_txg, !=, 0);
880
881 if (tr_cookie == NULL)
882 return;
883
884 while (tr = list_head(tr_list)) {
885 if (tr->tr_dp) {
886 dsl_pool_tempreserve_clear(tr->tr_dp, tr->tr_size, tx);
887 } else if (tr->tr_ds) {
888 mutex_enter(&tr->tr_ds->dd_lock);
889 ASSERT3U(tr->tr_ds->dd_tempreserved[txgidx], >=,
890 tr->tr_size);
891 tr->tr_ds->dd_tempreserved[txgidx] -= tr->tr_size;
892 mutex_exit(&tr->tr_ds->dd_lock);
893 } else {
894 arc_tempreserve_clear(tr->tr_size);
895 }
896 list_remove(tr_list, tr);
897 kmem_free(tr, sizeof (struct tempreserve));
898 }
899
900 kmem_free(tr_list, sizeof (list_t));
901 }
902
903 static void
904 dsl_dir_willuse_space_impl(dsl_dir_t *dd, int64_t space, dmu_tx_t *tx)
905 {
906 int64_t parent_space;
907 uint64_t est_used;
908
909 mutex_enter(&dd->dd_lock);
910 if (space > 0)
911 dd->dd_space_towrite[tx->tx_txg & TXG_MASK] += space;
912
913 est_used = dsl_dir_space_towrite(dd) + dd->dd_phys->dd_used_bytes;
914 parent_space = parent_delta(dd, est_used, space);
915 mutex_exit(&dd->dd_lock);
916
917 /* Make sure that we clean up dd_space_to* */
918 dsl_dir_dirty(dd, tx);
919
920 /* XXX this is potentially expensive and unnecessary... */
921 if (parent_space && dd->dd_parent)
922 dsl_dir_willuse_space_impl(dd->dd_parent, parent_space, tx);
923 }
924
925 /*
926 * Call in open context when we think we're going to write/free space,
927 * eg. when dirtying data. Be conservative (ie. OK to write less than
928 * this or free more than this, but don't write more or free less).
929 */
930 void
931 dsl_dir_willuse_space(dsl_dir_t *dd, int64_t space, dmu_tx_t *tx)
932 {
933 dsl_pool_willuse_space(dd->dd_pool, space, tx);
934 dsl_dir_willuse_space_impl(dd, space, tx);
935 }
936
937 /* call from syncing context when we actually write/free space for this dd */
938 void
939 dsl_dir_diduse_space(dsl_dir_t *dd, dd_used_t type,
940 int64_t used, int64_t compressed, int64_t uncompressed, dmu_tx_t *tx)
941 {
942 int64_t accounted_delta;
943 boolean_t needlock = !MUTEX_HELD(&dd->dd_lock);
944
945 ASSERT(dmu_tx_is_syncing(tx));
946 ASSERT(type < DD_USED_NUM);
947
948 dsl_dir_dirty(dd, tx);
949
950 if (needlock)
951 mutex_enter(&dd->dd_lock);
952 accounted_delta = parent_delta(dd, dd->dd_phys->dd_used_bytes, used);
953 ASSERT(used >= 0 || dd->dd_phys->dd_used_bytes >= -used);
954 ASSERT(compressed >= 0 ||
955 dd->dd_phys->dd_compressed_bytes >= -compressed);
956 ASSERT(uncompressed >= 0 ||
957 dd->dd_phys->dd_uncompressed_bytes >= -uncompressed);
958 dd->dd_phys->dd_used_bytes += used;
959 dd->dd_phys->dd_uncompressed_bytes += uncompressed;
960 dd->dd_phys->dd_compressed_bytes += compressed;
961
962 if (dd->dd_phys->dd_flags & DD_FLAG_USED_BREAKDOWN) {
963 ASSERT(used > 0 ||
964 dd->dd_phys->dd_used_breakdown[type] >= -used);
965 dd->dd_phys->dd_used_breakdown[type] += used;
966 #ifdef DEBUG
967 dd_used_t t;
968 uint64_t u = 0;
969 for (t = 0; t < DD_USED_NUM; t++)
970 u += dd->dd_phys->dd_used_breakdown[t];
971 ASSERT3U(u, ==, dd->dd_phys->dd_used_bytes);
972 #endif
973 }
974 if (needlock)
975 mutex_exit(&dd->dd_lock);
976
977 if (dd->dd_parent != NULL) {
978 dsl_dir_diduse_space(dd->dd_parent, DD_USED_CHILD,
979 accounted_delta, compressed, uncompressed, tx);
980 dsl_dir_transfer_space(dd->dd_parent,
981 used - accounted_delta,
982 DD_USED_CHILD_RSRV, DD_USED_CHILD, tx);
983 }
984 }
985
986 void
987 dsl_dir_transfer_space(dsl_dir_t *dd, int64_t delta,
988 dd_used_t oldtype, dd_used_t newtype, dmu_tx_t *tx)
989 {
990 boolean_t needlock = !MUTEX_HELD(&dd->dd_lock);
991
992 ASSERT(dmu_tx_is_syncing(tx));
993 ASSERT(oldtype < DD_USED_NUM);
994 ASSERT(newtype < DD_USED_NUM);
995
996 if (delta == 0 || !(dd->dd_phys->dd_flags & DD_FLAG_USED_BREAKDOWN))
997 return;
998
999 dsl_dir_dirty(dd, tx);
1000 if (needlock)
1001 mutex_enter(&dd->dd_lock);
1002 ASSERT(delta > 0 ?
1003 dd->dd_phys->dd_used_breakdown[oldtype] >= delta :
1004 dd->dd_phys->dd_used_breakdown[newtype] >= -delta);
1005 ASSERT(dd->dd_phys->dd_used_bytes >= ABS(delta));
1006 dd->dd_phys->dd_used_breakdown[oldtype] -= delta;
1007 dd->dd_phys->dd_used_breakdown[newtype] += delta;
1008 if (needlock)
1009 mutex_exit(&dd->dd_lock);
1010 }
1011
1012 static int
1013 dsl_dir_set_quota_check(void *arg1, void *arg2, dmu_tx_t *tx)
1014 {
1015 dsl_dataset_t *ds = arg1;
1016 dsl_dir_t *dd = ds->ds_dir;
1017 dsl_prop_setarg_t *psa = arg2;
1018 int err;
1019 uint64_t towrite;
1020
1021 if ((err = dsl_prop_predict_sync(ds->ds_dir, psa)) != 0)
1022 return (err);
1023
1024 if (psa->psa_effective_value == 0)
1025 return (0);
1026
1027 mutex_enter(&dd->dd_lock);
1028 /*
1029 * If we are doing the preliminary check in open context, and
1030 * there are pending changes, then don't fail it, since the
1031 * pending changes could under-estimate the amount of space to be
1032 * freed up.
1033 */
1034 towrite = dsl_dir_space_towrite(dd);
1035 if ((dmu_tx_is_syncing(tx) || towrite == 0) &&
1036 (psa->psa_effective_value < dd->dd_phys->dd_reserved ||
1037 psa->psa_effective_value < dd->dd_phys->dd_used_bytes + towrite)) {
1038 err = ENOSPC;
1039 }
1040 mutex_exit(&dd->dd_lock);
1041 return (err);
1042 }
1043
1044 extern dsl_syncfunc_t dsl_prop_set_sync;
1045
1046 static void
1047 dsl_dir_set_quota_sync(void *arg1, void *arg2, dmu_tx_t *tx)
1048 {
1049 dsl_dataset_t *ds = arg1;
1050 dsl_dir_t *dd = ds->ds_dir;
1051 dsl_prop_setarg_t *psa = arg2;
1052 uint64_t effective_value = psa->psa_effective_value;
1053
1054 dsl_prop_set_sync(ds, psa, tx);
1055 DSL_PROP_CHECK_PREDICTION(dd, psa);
1056
1057 dmu_buf_will_dirty(dd->dd_dbuf, tx);
1058
1059 mutex_enter(&dd->dd_lock);
1060 dd->dd_phys->dd_quota = effective_value;
1061 mutex_exit(&dd->dd_lock);
1062
1063 spa_history_log_internal(LOG_DS_QUOTA, dd->dd_pool->dp_spa,
1064 tx, "%lld dataset = %llu ",
1065 (longlong_t)effective_value, dd->dd_phys->dd_head_dataset_obj);
1066 }
1067
1068 int
1069 dsl_dir_set_quota(const char *ddname, zprop_source_t source, uint64_t quota)
1070 {
1071 dsl_dir_t *dd;
1072 dsl_dataset_t *ds;
1073 dsl_prop_setarg_t psa;
1074 int err;
1075
1076 dsl_prop_setarg_init_uint64(&psa, "quota", source, &quota);
1077
1078 err = dsl_dataset_hold(ddname, FTAG, &ds);
1079 if (err)
1080 return (err);
1081
1082 err = dsl_dir_open(ddname, FTAG, &dd, NULL);
1083 if (err) {
1084 dsl_dataset_rele(ds, FTAG);
1085 return (err);
1086 }
1087
1088 ASSERT(ds->ds_dir == dd);
1089
1090 /*
1091 * If someone removes a file, then tries to set the quota, we want to
1092 * make sure the file freeing takes effect.
1093 */
1094 txg_wait_open(dd->dd_pool, 0);
1095
1096 err = dsl_sync_task_do(dd->dd_pool, dsl_dir_set_quota_check,
1097 dsl_dir_set_quota_sync, ds, &psa, 0);
1098
1099 dsl_dir_close(dd, FTAG);
1100 dsl_dataset_rele(ds, FTAG);
1101 return (err);
1102 }
1103
1104 int
1105 dsl_dir_set_reservation_check(void *arg1, void *arg2, dmu_tx_t *tx)
1106 {
1107 dsl_dataset_t *ds = arg1;
1108 dsl_dir_t *dd = ds->ds_dir;
1109 dsl_prop_setarg_t *psa = arg2;
1110 uint64_t effective_value;
1111 uint64_t used, avail;
1112 int err;
1113
1114 if ((err = dsl_prop_predict_sync(ds->ds_dir, psa)) != 0)
1115 return (err);
1116
1117 effective_value = psa->psa_effective_value;
1118
1119 /*
1120 * If we are doing the preliminary check in open context, the
1121 * space estimates may be inaccurate.
1122 */
1123 if (!dmu_tx_is_syncing(tx))
1124 return (0);
1125
1126 mutex_enter(&dd->dd_lock);
1127 used = dd->dd_phys->dd_used_bytes;
1128 mutex_exit(&dd->dd_lock);
1129
1130 if (dd->dd_parent) {
1131 avail = dsl_dir_space_available(dd->dd_parent,
1132 NULL, 0, FALSE);
1133 } else {
1134 avail = dsl_pool_adjustedsize(dd->dd_pool, B_FALSE) - used;
1135 }
1136
1137 if (MAX(used, effective_value) > MAX(used, dd->dd_phys->dd_reserved)) {
1138 uint64_t delta = MAX(used, effective_value) -
1139 MAX(used, dd->dd_phys->dd_reserved);
1140
1141 if (delta > avail)
1142 return (ENOSPC);
1143 if (dd->dd_phys->dd_quota > 0 &&
1144 effective_value > dd->dd_phys->dd_quota)
1145 return (ENOSPC);
1146 }
1147
1148 return (0);
1149 }
1150
1151 static void
1152 dsl_dir_set_reservation_sync(void *arg1, void *arg2, dmu_tx_t *tx)
1153 {
1154 dsl_dataset_t *ds = arg1;
1155 dsl_dir_t *dd = ds->ds_dir;
1156 dsl_prop_setarg_t *psa = arg2;
1157 uint64_t effective_value = psa->psa_effective_value;
1158 uint64_t used;
1159 int64_t delta;
1160
1161 dsl_prop_set_sync(ds, psa, tx);
1162 DSL_PROP_CHECK_PREDICTION(dd, psa);
1163
1164 dmu_buf_will_dirty(dd->dd_dbuf, tx);
1165
1166 mutex_enter(&dd->dd_lock);
1167 used = dd->dd_phys->dd_used_bytes;
1168 delta = MAX(used, effective_value) -
1169 MAX(used, dd->dd_phys->dd_reserved);
1170 dd->dd_phys->dd_reserved = effective_value;
1171
1172 if (dd->dd_parent != NULL) {
1173 /* Roll up this additional usage into our ancestors */
1174 dsl_dir_diduse_space(dd->dd_parent, DD_USED_CHILD_RSRV,
1175 delta, 0, 0, tx);
1176 }
1177 mutex_exit(&dd->dd_lock);
1178
1179 spa_history_log_internal(LOG_DS_RESERVATION, dd->dd_pool->dp_spa,
1180 tx, "%lld dataset = %llu",
1181 (longlong_t)effective_value, dd->dd_phys->dd_head_dataset_obj);
1182 }
1183
1184 int
1185 dsl_dir_set_reservation(const char *ddname, zprop_source_t source,
1186 uint64_t reservation)
1187 {
1188 dsl_dir_t *dd;
1189 dsl_dataset_t *ds;
1190 dsl_prop_setarg_t psa;
1191 int err;
1192
1193 dsl_prop_setarg_init_uint64(&psa, "reservation", source, &reservation);
1194
1195 err = dsl_dataset_hold(ddname, FTAG, &ds);
1196 if (err)
1197 return (err);
1198
1199 err = dsl_dir_open(ddname, FTAG, &dd, NULL);
1200 if (err) {
1201 dsl_dataset_rele(ds, FTAG);
1202 return (err);
1203 }
1204
1205 ASSERT(ds->ds_dir == dd);
1206
1207 err = dsl_sync_task_do(dd->dd_pool, dsl_dir_set_reservation_check,
1208 dsl_dir_set_reservation_sync, ds, &psa, 0);
1209
1210 dsl_dir_close(dd, FTAG);
1211 dsl_dataset_rele(ds, FTAG);
1212 return (err);
1213 }
1214
1215 static dsl_dir_t *
1216 closest_common_ancestor(dsl_dir_t *ds1, dsl_dir_t *ds2)
1217 {
1218 for (; ds1; ds1 = ds1->dd_parent) {
1219 dsl_dir_t *dd;
1220 for (dd = ds2; dd; dd = dd->dd_parent) {
1221 if (ds1 == dd)
1222 return (dd);
1223 }
1224 }
1225 return (NULL);
1226 }
1227
1228 /*
1229 * If delta is applied to dd, how much of that delta would be applied to
1230 * ancestor? Syncing context only.
1231 */
1232 static int64_t
1233 would_change(dsl_dir_t *dd, int64_t delta, dsl_dir_t *ancestor)
1234 {
1235 if (dd == ancestor)
1236 return (delta);
1237
1238 mutex_enter(&dd->dd_lock);
1239 delta = parent_delta(dd, dd->dd_phys->dd_used_bytes, delta);
1240 mutex_exit(&dd->dd_lock);
1241 return (would_change(dd->dd_parent, delta, ancestor));
1242 }
1243
1244 struct renamearg {
1245 dsl_dir_t *newparent;
1246 const char *mynewname;
1247 };
1248
1249 static int
1250 dsl_dir_rename_check(void *arg1, void *arg2, dmu_tx_t *tx)
1251 {
1252 dsl_dir_t *dd = arg1;
1253 struct renamearg *ra = arg2;
1254 dsl_pool_t *dp = dd->dd_pool;
1255 objset_t *mos = dp->dp_meta_objset;
1256 int err;
1257 uint64_t val;
1258
1259 /*
1260 * There should only be one reference, from dmu_objset_rename().
1261 * Fleeting holds are also possible (eg, from "zfs list" getting
1262 * stats), but any that are present in open context will likely
1263 * be gone by syncing context, so only fail from syncing
1264 * context.
1265 */
1266 if (dmu_tx_is_syncing(tx) && dmu_buf_refcount(dd->dd_dbuf) > 1)
1267 return (EBUSY);
1268
1269 /* check for existing name */
1270 err = zap_lookup(mos, ra->newparent->dd_phys->dd_child_dir_zapobj,
1271 ra->mynewname, 8, 1, &val);
1272 if (err == 0)
1273 return (EEXIST);
1274 if (err != ENOENT)
1275 return (err);
1276
1277 if (ra->newparent != dd->dd_parent) {
1278 /* is there enough space? */
1279 uint64_t myspace =
1280 MAX(dd->dd_phys->dd_used_bytes, dd->dd_phys->dd_reserved);
1281
1282 /* no rename into our descendant */
1283 if (closest_common_ancestor(dd, ra->newparent) == dd)
1284 return (EINVAL);
1285
1286 if (err = dsl_dir_transfer_possible(dd->dd_parent,
1287 ra->newparent, myspace))
1288 return (err);
1289 }
1290
1291 return (0);
1292 }
1293
1294 static void
1295 dsl_dir_rename_sync(void *arg1, void *arg2, dmu_tx_t *tx)
1296 {
1297 dsl_dir_t *dd = arg1;
1298 struct renamearg *ra = arg2;
1299 dsl_pool_t *dp = dd->dd_pool;
1300 objset_t *mos = dp->dp_meta_objset;
1301 int err;
1302
1303 ASSERT(dmu_buf_refcount(dd->dd_dbuf) <= 2);
1304
1305 if (ra->newparent != dd->dd_parent) {
1306 dsl_dir_diduse_space(dd->dd_parent, DD_USED_CHILD,
1307 -dd->dd_phys->dd_used_bytes,
1308 -dd->dd_phys->dd_compressed_bytes,
1309 -dd->dd_phys->dd_uncompressed_bytes, tx);
1310 dsl_dir_diduse_space(ra->newparent, DD_USED_CHILD,
1311 dd->dd_phys->dd_used_bytes,
1312 dd->dd_phys->dd_compressed_bytes,
1313 dd->dd_phys->dd_uncompressed_bytes, tx);
1314
1315 if (dd->dd_phys->dd_reserved > dd->dd_phys->dd_used_bytes) {
1316 uint64_t unused_rsrv = dd->dd_phys->dd_reserved -
1317 dd->dd_phys->dd_used_bytes;
1318
1319 dsl_dir_diduse_space(dd->dd_parent, DD_USED_CHILD_RSRV,
1320 -unused_rsrv, 0, 0, tx);
1321 dsl_dir_diduse_space(ra->newparent, DD_USED_CHILD_RSRV,
1322 unused_rsrv, 0, 0, tx);
1323 }
1324 }
1325
1326 dmu_buf_will_dirty(dd->dd_dbuf, tx);
1327
1328 /* remove from old parent zapobj */
1329 err = zap_remove(mos, dd->dd_parent->dd_phys->dd_child_dir_zapobj,
1330 dd->dd_myname, tx);
1331 ASSERT3U(err, ==, 0);
1332
1333 (void) strcpy(dd->dd_myname, ra->mynewname);
1334 dsl_dir_close(dd->dd_parent, dd);
1335 dd->dd_phys->dd_parent_obj = ra->newparent->dd_object;
1336 VERIFY(0 == dsl_dir_open_obj(dd->dd_pool,
1337 ra->newparent->dd_object, NULL, dd, &dd->dd_parent));
1338
1339 /* add to new parent zapobj */
1340 err = zap_add(mos, ra->newparent->dd_phys->dd_child_dir_zapobj,
1341 dd->dd_myname, 8, 1, &dd->dd_object, tx);
1342 ASSERT3U(err, ==, 0);
1343
1344 spa_history_log_internal(LOG_DS_RENAME, dd->dd_pool->dp_spa,
1345 tx, "dataset = %llu", dd->dd_phys->dd_head_dataset_obj);
1346 }
1347
1348 int
1349 dsl_dir_rename(dsl_dir_t *dd, const char *newname)
1350 {
1351 struct renamearg ra;
1352 int err;
1353
1354 /* new parent should exist */
1355 err = dsl_dir_open(newname, FTAG, &ra.newparent, &ra.mynewname);
1356 if (err)
1357 return (err);
1358
1359 /* can't rename to different pool */
1360 if (dd->dd_pool != ra.newparent->dd_pool) {
1361 err = ENXIO;
1362 goto out;
1363 }
1364
1365 /* new name should not already exist */
1366 if (ra.mynewname == NULL) {
1367 err = EEXIST;
1368 goto out;
1369 }
1370
1371 err = dsl_sync_task_do(dd->dd_pool,
1372 dsl_dir_rename_check, dsl_dir_rename_sync, dd, &ra, 3);
1373
1374 out:
1375 dsl_dir_close(ra.newparent, FTAG);
1376 return (err);
1377 }
1378
1379 int
1380 dsl_dir_transfer_possible(dsl_dir_t *sdd, dsl_dir_t *tdd, uint64_t space)
1381 {
1382 dsl_dir_t *ancestor;
1383 int64_t adelta;
1384 uint64_t avail;
1385
1386 ancestor = closest_common_ancestor(sdd, tdd);
1387 adelta = would_change(sdd, -space, ancestor);
1388 avail = dsl_dir_space_available(tdd, ancestor, adelta, FALSE);
1389 if (avail < space)
1390 return (ENOSPC);
1391
1392 return (0);
1393 }
1394
1395 timestruc_t
1396 dsl_dir_snap_cmtime(dsl_dir_t *dd)
1397 {
1398 timestruc_t t;
1399
1400 mutex_enter(&dd->dd_lock);
1401 t = dd->dd_snap_cmtime;
1402 mutex_exit(&dd->dd_lock);
1403
1404 return (t);
1405 }
1406
1407 void
1408 dsl_dir_snap_cmtime_update(dsl_dir_t *dd)
1409 {
1410 timestruc_t t;
1411
1412 gethrestime(&t);
1413 mutex_enter(&dd->dd_lock);
1414 dd->dd_snap_cmtime = t;
1415 mutex_exit(&dd->dd_lock);
1416 }
Unleashed OS