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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 2009 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
24 */
25
26 #include <sys/dmu.h>
27 #include <sys/dmu_impl.h>
28 #include <sys/dmu_tx.h>
29 #include <sys/dbuf.h>
30 #include <sys/dnode.h>
31 #include <sys/zfs_context.h>
32 #include <sys/dmu_objset.h>
33 #include <sys/dmu_traverse.h>
34 #include <sys/dsl_dataset.h>
35 #include <sys/dsl_dir.h>
36 #include <sys/dsl_pool.h>
37 #include <sys/dsl_synctask.h>
38 #include <sys/zfs_ioctl.h>
39 #include <sys/zap.h>
40 #include <sys/zio_checksum.h>
41
42 static char *dmu_recv_tag = "dmu_recv_tag";
43
44 struct backuparg {
45 dmu_replay_record_t *drr;
46 vnode_t *vp;
47 offset_t *off;
48 objset_t *os;
49 zio_cksum_t zc;
50 int err;
51 };
52
53 static int
54 dump_bytes(struct backuparg *ba, void *buf, int len)
55 {
56 ssize_t resid; /* have to get resid to get detailed errno */
57 ASSERT3U(len % 8, ==, 0);
58
59 fletcher_4_incremental_native(buf, len, &ba->zc);
60 ba->err = vn_rdwr(UIO_WRITE, ba->vp,
61 (caddr_t)buf, len,
62 0, UIO_SYSSPACE, FAPPEND, RLIM64_INFINITY, CRED(), &resid);
63 *ba->off += len;
64 return (ba->err);
65 }
66
67 static int
68 dump_free(struct backuparg *ba, uint64_t object, uint64_t offset,
69 uint64_t length)
70 {
71 /* write a FREE record */
72 bzero(ba->drr, sizeof (dmu_replay_record_t));
73 ba->drr->drr_type = DRR_FREE;
74 ba->drr->drr_u.drr_free.drr_object = object;
75 ba->drr->drr_u.drr_free.drr_offset = offset;
76 ba->drr->drr_u.drr_free.drr_length = length;
77
78 if (dump_bytes(ba, ba->drr, sizeof (dmu_replay_record_t)))
79 return (EINTR);
80 return (0);
81 }
82
83 static int
84 dump_data(struct backuparg *ba, dmu_object_type_t type,
85 uint64_t object, uint64_t offset, int blksz, void *data)
86 {
87 /* write a DATA record */
88 bzero(ba->drr, sizeof (dmu_replay_record_t));
89 ba->drr->drr_type = DRR_WRITE;
90 ba->drr->drr_u.drr_write.drr_object = object;
91 ba->drr->drr_u.drr_write.drr_type = type;
92 ba->drr->drr_u.drr_write.drr_offset = offset;
93 ba->drr->drr_u.drr_write.drr_length = blksz;
94
95 if (dump_bytes(ba, ba->drr, sizeof (dmu_replay_record_t)))
96 return (EINTR);
97 if (dump_bytes(ba, data, blksz))
98 return (EINTR);
99 return (0);
100 }
101
102 static int
103 dump_freeobjects(struct backuparg *ba, uint64_t firstobj, uint64_t numobjs)
104 {
105 /* write a FREEOBJECTS record */
106 bzero(ba->drr, sizeof (dmu_replay_record_t));
107 ba->drr->drr_type = DRR_FREEOBJECTS;
108 ba->drr->drr_u.drr_freeobjects.drr_firstobj = firstobj;
109 ba->drr->drr_u.drr_freeobjects.drr_numobjs = numobjs;
110
111 if (dump_bytes(ba, ba->drr, sizeof (dmu_replay_record_t)))
112 return (EINTR);
113 return (0);
114 }
115
116 static int
117 dump_dnode(struct backuparg *ba, uint64_t object, dnode_phys_t *dnp)
118 {
119 if (dnp == NULL || dnp->dn_type == DMU_OT_NONE)
120 return (dump_freeobjects(ba, object, 1));
121
122 /* write an OBJECT record */
123 bzero(ba->drr, sizeof (dmu_replay_record_t));
124 ba->drr->drr_type = DRR_OBJECT;
125 ba->drr->drr_u.drr_object.drr_object = object;
126 ba->drr->drr_u.drr_object.drr_type = dnp->dn_type;
127 ba->drr->drr_u.drr_object.drr_bonustype = dnp->dn_bonustype;
128 ba->drr->drr_u.drr_object.drr_blksz =
129 dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT;
130 ba->drr->drr_u.drr_object.drr_bonuslen = dnp->dn_bonuslen;
131 ba->drr->drr_u.drr_object.drr_checksum = dnp->dn_checksum;
132 ba->drr->drr_u.drr_object.drr_compress = dnp->dn_compress;
133
134 if (dump_bytes(ba, ba->drr, sizeof (dmu_replay_record_t)))
135 return (EINTR);
136
137 if (dump_bytes(ba, DN_BONUS(dnp), P2ROUNDUP(dnp->dn_bonuslen, 8)))
138 return (EINTR);
139
140 /* free anything past the end of the file */
141 if (dump_free(ba, object, (dnp->dn_maxblkid + 1) *
142 (dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT), -1ULL))
143 return (EINTR);
144 if (ba->err)
145 return (EINTR);
146 return (0);
147 }
148
149 #define BP_SPAN(dnp, level) \
150 (((uint64_t)dnp->dn_datablkszsec) << (SPA_MINBLOCKSHIFT + \
151 (level) * (dnp->dn_indblkshift - SPA_BLKPTRSHIFT)))
152
153 static int
154 backup_cb(spa_t *spa, blkptr_t *bp, const zbookmark_t *zb,
155 const dnode_phys_t *dnp, void *arg)
156 {
157 struct backuparg *ba = arg;
158 dmu_object_type_t type = bp ? BP_GET_TYPE(bp) : DMU_OT_NONE;
159 int err = 0;
160
161 if (issig(JUSTLOOKING) && issig(FORREAL))
162 return (EINTR);
163
164 if (bp == NULL && zb->zb_object == 0) {
165 uint64_t span = BP_SPAN(dnp, zb->zb_level);
166 uint64_t dnobj = (zb->zb_blkid * span) >> DNODE_SHIFT;
167 err = dump_freeobjects(ba, dnobj, span >> DNODE_SHIFT);
168 } else if (bp == NULL) {
169 uint64_t span = BP_SPAN(dnp, zb->zb_level);
170 err = dump_free(ba, zb->zb_object, zb->zb_blkid * span, span);
171 } else if (zb->zb_level > 0 || type == DMU_OT_OBJSET) {
172 return (0);
173 } else if (type == DMU_OT_DNODE) {
174 dnode_phys_t *blk;
175 int i;
176 int blksz = BP_GET_LSIZE(bp);
177 uint32_t aflags = ARC_WAIT;
178 arc_buf_t *abuf;
179
180 if (arc_read_nolock(NULL, spa, bp,
181 arc_getbuf_func, &abuf, ZIO_PRIORITY_ASYNC_READ,
182 ZIO_FLAG_CANFAIL, &aflags, zb) != 0)
183 return (EIO);
184
185 blk = abuf->b_data;
186 for (i = 0; i < blksz >> DNODE_SHIFT; i++) {
187 uint64_t dnobj = (zb->zb_blkid <<
188 (DNODE_BLOCK_SHIFT - DNODE_SHIFT)) + i;
189 err = dump_dnode(ba, dnobj, blk+i);
190 if (err)
191 break;
192 }
193 (void) arc_buf_remove_ref(abuf, &abuf);
194 } else { /* it's a level-0 block of a regular object */
195 uint32_t aflags = ARC_WAIT;
196 arc_buf_t *abuf;
197 int blksz = BP_GET_LSIZE(bp);
198
199 if (arc_read_nolock(NULL, spa, bp,
200 arc_getbuf_func, &abuf, ZIO_PRIORITY_ASYNC_READ,
201 ZIO_FLAG_CANFAIL, &aflags, zb) != 0)
202 return (EIO);
203
204 err = dump_data(ba, type, zb->zb_object, zb->zb_blkid * blksz,
205 blksz, abuf->b_data);
206 (void) arc_buf_remove_ref(abuf, &abuf);
207 }
208
209 ASSERT(err == 0 || err == EINTR);
210 return (err);
211 }
212
213 int
214 dmu_sendbackup(objset_t *tosnap, objset_t *fromsnap, boolean_t fromorigin,
215 vnode_t *vp, offset_t *off)
216 {
217 dsl_dataset_t *ds = tosnap->os->os_dsl_dataset;
218 dsl_dataset_t *fromds = fromsnap ? fromsnap->os->os_dsl_dataset : NULL;
219 dmu_replay_record_t *drr;
220 struct backuparg ba;
221 int err;
222 uint64_t fromtxg = 0;
223
224 /* tosnap must be a snapshot */
225 if (ds->ds_phys->ds_next_snap_obj == 0)
226 return (EINVAL);
227
228 /* fromsnap must be an earlier snapshot from the same fs as tosnap */
229 if (fromds && (ds->ds_dir != fromds->ds_dir ||
230 fromds->ds_phys->ds_creation_txg >= ds->ds_phys->ds_creation_txg))
231 return (EXDEV);
232
233 if (fromorigin) {
234 dsl_pool_t *dp = ds->ds_dir->dd_pool;
235
236 if (fromsnap)
237 return (EINVAL);
238
239 if (dsl_dir_is_clone(ds->ds_dir)) {
240 rw_enter(&dp->dp_config_rwlock, RW_READER);
241 err = dsl_dataset_hold_obj(dp,
242 ds->ds_dir->dd_phys->dd_origin_obj, FTAG, &fromds);
243 rw_exit(&dp->dp_config_rwlock);
244 if (err)
245 return (err);
246 } else {
247 fromorigin = B_FALSE;
248 }
249 }
250
251
252 drr = kmem_zalloc(sizeof (dmu_replay_record_t), KM_SLEEP);
253 drr->drr_type = DRR_BEGIN;
254 drr->drr_u.drr_begin.drr_magic = DMU_BACKUP_MAGIC;
255 drr->drr_u.drr_begin.drr_version = DMU_BACKUP_STREAM_VERSION;
256 drr->drr_u.drr_begin.drr_creation_time =
257 ds->ds_phys->ds_creation_time;
258 drr->drr_u.drr_begin.drr_type = tosnap->os->os_phys->os_type;
259 if (fromorigin)
260 drr->drr_u.drr_begin.drr_flags |= DRR_FLAG_CLONE;
261 drr->drr_u.drr_begin.drr_toguid = ds->ds_phys->ds_guid;
262 if (ds->ds_phys->ds_flags & DS_FLAG_CI_DATASET)
263 drr->drr_u.drr_begin.drr_flags |= DRR_FLAG_CI_DATA;
264
265 if (fromds)
266 drr->drr_u.drr_begin.drr_fromguid = fromds->ds_phys->ds_guid;
267 dsl_dataset_name(ds, drr->drr_u.drr_begin.drr_toname);
268
269 if (fromds)
270 fromtxg = fromds->ds_phys->ds_creation_txg;
271 if (fromorigin)
272 dsl_dataset_rele(fromds, FTAG);
273
274 ba.drr = drr;
275 ba.vp = vp;
276 ba.os = tosnap;
277 ba.off = off;
278 ZIO_SET_CHECKSUM(&ba.zc, 0, 0, 0, 0);
279
280 if (dump_bytes(&ba, drr, sizeof (dmu_replay_record_t))) {
281 kmem_free(drr, sizeof (dmu_replay_record_t));
282 return (ba.err);
283 }
284
285 err = traverse_dataset(ds, fromtxg, TRAVERSE_PRE | TRAVERSE_PREFETCH,
286 backup_cb, &ba);
287
288 if (err) {
289 if (err == EINTR && ba.err)
290 err = ba.err;
291 kmem_free(drr, sizeof (dmu_replay_record_t));
292 return (err);
293 }
294
295 bzero(drr, sizeof (dmu_replay_record_t));
296 drr->drr_type = DRR_END;
297 drr->drr_u.drr_end.drr_checksum = ba.zc;
298
299 if (dump_bytes(&ba, drr, sizeof (dmu_replay_record_t))) {
300 kmem_free(drr, sizeof (dmu_replay_record_t));
301 return (ba.err);
302 }
303
304 kmem_free(drr, sizeof (dmu_replay_record_t));
305
306 return (0);
307 }
308
309 struct recvbeginsyncarg {
310 const char *tofs;
311 const char *tosnap;
312 dsl_dataset_t *origin;
313 uint64_t fromguid;
314 dmu_objset_type_t type;
315 void *tag;
316 boolean_t force;
317 uint64_t dsflags;
318 char clonelastname[MAXNAMELEN];
319 dsl_dataset_t *ds; /* the ds to recv into; returned from the syncfunc */
320 };
321
322 static dsl_dataset_t *
323 recv_full_sync_impl(dsl_pool_t *dp, uint64_t dsobj, dmu_objset_type_t type,
324 cred_t *cr, dmu_tx_t *tx)
325 {
326 dsl_dataset_t *ds;
327
328 /* This should always work, since we just created it */
329 /* XXX - create should return an owned ds */
330 VERIFY(0 == dsl_dataset_own_obj(dp, dsobj,
331 DS_MODE_INCONSISTENT, dmu_recv_tag, &ds));
332
333 if (type != DMU_OST_NONE) {
334 (void) dmu_objset_create_impl(dp->dp_spa,
335 ds, &ds->ds_phys->ds_bp, type, tx);
336 }
337
338 spa_history_internal_log(LOG_DS_REPLAY_FULL_SYNC,
339 dp->dp_spa, tx, cr, "dataset = %lld", dsobj);
340
341 return (ds);
342 }
343
344 /* ARGSUSED */
345 static int
346 recv_full_check(void *arg1, void *arg2, dmu_tx_t *tx)
347 {
348 dsl_dir_t *dd = arg1;
349 struct recvbeginsyncarg *rbsa = arg2;
350 objset_t *mos = dd->dd_pool->dp_meta_objset;
351 uint64_t val;
352 int err;
353
354 err = zap_lookup(mos, dd->dd_phys->dd_child_dir_zapobj,
355 strrchr(rbsa->tofs, '/') + 1, sizeof (uint64_t), 1, &val);
356
357 if (err != ENOENT)
358 return (err ? err : EEXIST);
359
360 if (rbsa->origin) {
361 /* make sure it's a snap in the same pool */
362 if (rbsa->origin->ds_dir->dd_pool != dd->dd_pool)
363 return (EXDEV);
364 if (rbsa->origin->ds_phys->ds_num_children == 0)
365 return (EINVAL);
366 if (rbsa->origin->ds_phys->ds_guid != rbsa->fromguid)
367 return (ENODEV);
368 }
369
370 return (0);
371 }
372
373 static void
374 recv_full_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx)
375 {
376 dsl_dir_t *dd = arg1;
377 struct recvbeginsyncarg *rbsa = arg2;
378 uint64_t flags = DS_FLAG_INCONSISTENT | rbsa->dsflags;
379 uint64_t dsobj;
380
381 dsobj = dsl_dataset_create_sync(dd, strrchr(rbsa->tofs, '/') + 1,
382 rbsa->origin, flags, cr, tx);
383
384 rbsa->ds = recv_full_sync_impl(dd->dd_pool, dsobj,
385 rbsa->origin ? DMU_OST_NONE : rbsa->type, cr, tx);
386 }
387
388 static int
389 recv_full_existing_check(void *arg1, void *arg2, dmu_tx_t *tx)
390 {
391 dsl_dataset_t *ds = arg1;
392 struct recvbeginsyncarg *rbsa = arg2;
393 int err;
394
395 /* must be a head ds */
396 if (ds->ds_phys->ds_next_snap_obj != 0)
397 return (EINVAL);
398
399 /* must not be a clone ds */
400 if (dsl_dir_is_clone(ds->ds_dir))
401 return (EINVAL);
402
403 err = dsl_dataset_destroy_check(ds, rbsa->tag, tx);
404 if (err)
405 return (err);
406
407 if (rbsa->origin) {
408 /* make sure it's a snap in the same pool */
409 if (rbsa->origin->ds_dir->dd_pool != ds->ds_dir->dd_pool)
410 return (EXDEV);
411 if (rbsa->origin->ds_phys->ds_num_children == 0)
412 return (EINVAL);
413 if (rbsa->origin->ds_phys->ds_guid != rbsa->fromguid)
414 return (ENODEV);
415 }
416
417 return (0);
418 }
419
420 static void
421 recv_full_existing_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx)
422 {
423 dsl_dataset_t *ds = arg1;
424 struct recvbeginsyncarg *rbsa = arg2;
425 dsl_dir_t *dd = ds->ds_dir;
426 uint64_t flags = DS_FLAG_INCONSISTENT | rbsa->dsflags;
427 uint64_t dsobj;
428
429 /*
430 * NB: caller must provide an extra hold on the dsl_dir_t, so it
431 * won't go away when dsl_dataset_destroy_sync() closes the
432 * dataset.
433 */
434 dsl_dataset_destroy_sync(ds, rbsa->tag, cr, tx);
435
436 dsobj = dsl_dataset_create_sync_dd(dd, rbsa->origin, flags, tx);
437
438 rbsa->ds = recv_full_sync_impl(dd->dd_pool, dsobj,
439 rbsa->origin ? DMU_OST_NONE : rbsa->type, cr, tx);
440 }
441
442 /* ARGSUSED */
443 static int
444 recv_incremental_check(void *arg1, void *arg2, dmu_tx_t *tx)
445 {
446 dsl_dataset_t *ds = arg1;
447 struct recvbeginsyncarg *rbsa = arg2;
448 int err;
449 uint64_t val;
450
451 /* must not have any changes since most recent snapshot */
452 if (!rbsa->force && dsl_dataset_modified_since_lastsnap(ds))
453 return (ETXTBSY);
454
455 /* must already be a snapshot of this fs */
456 if (ds->ds_phys->ds_prev_snap_obj == 0)
457 return (ENODEV);
458
459 /* most recent snapshot must match fromguid */
460 if (ds->ds_prev->ds_phys->ds_guid != rbsa->fromguid)
461 return (ENODEV);
462
463 /* temporary clone name must not exist */
464 err = zap_lookup(ds->ds_dir->dd_pool->dp_meta_objset,
465 ds->ds_dir->dd_phys->dd_child_dir_zapobj,
466 rbsa->clonelastname, 8, 1, &val);
467 if (err == 0)
468 return (EEXIST);
469 if (err != ENOENT)
470 return (err);
471
472 /* new snapshot name must not exist */
473 err = zap_lookup(ds->ds_dir->dd_pool->dp_meta_objset,
474 ds->ds_phys->ds_snapnames_zapobj, rbsa->tosnap, 8, 1, &val);
475 if (err == 0)
476 return (EEXIST);
477 if (err != ENOENT)
478 return (err);
479 return (0);
480 }
481
482 /* ARGSUSED */
483 static void
484 recv_online_incremental_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx)
485 {
486 dsl_dataset_t *ohds = arg1;
487 struct recvbeginsyncarg *rbsa = arg2;
488 dsl_pool_t *dp = ohds->ds_dir->dd_pool;
489 dsl_dataset_t *ods, *cds;
490 uint64_t flags = DS_FLAG_INCONSISTENT | rbsa->dsflags;
491 uint64_t dsobj;
492
493 /* create the temporary clone */
494 VERIFY(0 == dsl_dataset_hold_obj(dp, ohds->ds_phys->ds_prev_snap_obj,
495 FTAG, &ods));
496 dsobj = dsl_dataset_create_sync(ohds->ds_dir,
497 rbsa->clonelastname, ods, flags, cr, tx);
498 dsl_dataset_rele(ods, FTAG);
499
500 /* open the temporary clone */
501 VERIFY(0 == dsl_dataset_own_obj(dp, dsobj,
502 DS_MODE_INCONSISTENT, dmu_recv_tag, &cds));
503
504 /* copy the refquota from the target fs to the clone */
505 if (ohds->ds_quota > 0)
506 dsl_dataset_set_quota_sync(cds, &ohds->ds_quota, cr, tx);
507
508 rbsa->ds = cds;
509
510 spa_history_internal_log(LOG_DS_REPLAY_INC_SYNC,
511 dp->dp_spa, tx, cr, "dataset = %lld", dsobj);
512 }
513
514 /* ARGSUSED */
515 static void
516 recv_offline_incremental_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx)
517 {
518 dsl_dataset_t *ds = arg1;
519
520 dmu_buf_will_dirty(ds->ds_dbuf, tx);
521 ds->ds_phys->ds_flags |= DS_FLAG_INCONSISTENT;
522
523 spa_history_internal_log(LOG_DS_REPLAY_INC_SYNC,
524 ds->ds_dir->dd_pool->dp_spa, tx, cr, "dataset = %lld",
525 ds->ds_object);
526 }
527
528 /*
529 * NB: callers *MUST* call dmu_recv_stream() if dmu_recv_begin()
530 * succeeds; otherwise we will leak the holds on the datasets.
531 */
532 int
533 dmu_recv_begin(char *tofs, char *tosnap, struct drr_begin *drrb,
534 boolean_t force, objset_t *origin, boolean_t online, dmu_recv_cookie_t *drc)
535 {
536 int err = 0;
537 boolean_t byteswap;
538 struct recvbeginsyncarg rbsa;
539 uint64_t version;
540 int flags;
541 dsl_dataset_t *ds;
542
543 if (drrb->drr_magic == DMU_BACKUP_MAGIC)
544 byteswap = FALSE;
545 else if (drrb->drr_magic == BSWAP_64(DMU_BACKUP_MAGIC))
546 byteswap = TRUE;
547 else
548 return (EINVAL);
549
550 rbsa.tofs = tofs;
551 rbsa.tosnap = tosnap;
552 rbsa.origin = origin ? origin->os->os_dsl_dataset : NULL;
553 rbsa.fromguid = drrb->drr_fromguid;
554 rbsa.type = drrb->drr_type;
555 rbsa.tag = FTAG;
556 rbsa.dsflags = 0;
557 version = drrb->drr_version;
558 flags = drrb->drr_flags;
559
560 if (byteswap) {
561 rbsa.type = BSWAP_32(rbsa.type);
562 rbsa.fromguid = BSWAP_64(rbsa.fromguid);
563 version = BSWAP_64(version);
564 flags = BSWAP_32(flags);
565 }
566
567 if (version != DMU_BACKUP_STREAM_VERSION ||
568 rbsa.type >= DMU_OST_NUMTYPES ||
569 ((flags & DRR_FLAG_CLONE) && origin == NULL))
570 return (EINVAL);
571
572 if (flags & DRR_FLAG_CI_DATA)
573 rbsa.dsflags = DS_FLAG_CI_DATASET;
574
575 bzero(drc, sizeof (dmu_recv_cookie_t));
576 drc->drc_drrb = drrb;
577 drc->drc_tosnap = tosnap;
578 drc->drc_force = force;
579
580 /*
581 * Process the begin in syncing context.
582 */
583 if (rbsa.fromguid && !(flags & DRR_FLAG_CLONE) && !online) {
584 /* offline incremental receive */
585 err = dsl_dataset_own(tofs, 0, dmu_recv_tag, &ds);
586 if (err)
587 return (err);
588
589 /*
590 * Only do the rollback if the most recent snapshot
591 * matches the incremental source
592 */
593 if (force) {
594 if (ds->ds_prev == NULL ||
595 ds->ds_prev->ds_phys->ds_guid !=
596 rbsa.fromguid) {
597 dsl_dataset_disown(ds, dmu_recv_tag);
598 return (ENODEV);
599 }
600 (void) dsl_dataset_rollback(ds, DMU_OST_NONE);
601 }
602 rbsa.force = B_FALSE;
603 err = dsl_sync_task_do(ds->ds_dir->dd_pool,
604 recv_incremental_check,
605 recv_offline_incremental_sync, ds, &rbsa, 1);
606 if (err) {
607 dsl_dataset_disown(ds, dmu_recv_tag);
608 return (err);
609 }
610 drc->drc_logical_ds = drc->drc_real_ds = ds;
611 } else if (rbsa.fromguid && !(flags & DRR_FLAG_CLONE)) {
612 /* online incremental receive */
613
614 /* tmp clone name is: tofs/%tosnap" */
615 (void) snprintf(rbsa.clonelastname, sizeof (rbsa.clonelastname),
616 "%%%s", tosnap);
617
618 /* open the dataset we are logically receiving into */
619 err = dsl_dataset_hold(tofs, dmu_recv_tag, &ds);
620 if (err)
621 return (err);
622
623 rbsa.force = force;
624 err = dsl_sync_task_do(ds->ds_dir->dd_pool,
625 recv_incremental_check,
626 recv_online_incremental_sync, ds, &rbsa, 5);
627 if (err) {
628 dsl_dataset_rele(ds, dmu_recv_tag);
629 return (err);
630 }
631 drc->drc_logical_ds = ds;
632 drc->drc_real_ds = rbsa.ds;
633 } else {
634 /* create new fs -- full backup or clone */
635 dsl_dir_t *dd = NULL;
636 const char *tail;
637
638 err = dsl_dir_open(tofs, FTAG, &dd, &tail);
639 if (err)
640 return (err);
641 if (tail == NULL) {
642 if (!force) {
643 dsl_dir_close(dd, FTAG);
644 return (EEXIST);
645 }
646
647 rw_enter(&dd->dd_pool->dp_config_rwlock, RW_READER);
648 err = dsl_dataset_own_obj(dd->dd_pool,
649 dd->dd_phys->dd_head_dataset_obj,
650 DS_MODE_INCONSISTENT, FTAG, &ds);
651 rw_exit(&dd->dd_pool->dp_config_rwlock);
652 if (err) {
653 dsl_dir_close(dd, FTAG);
654 return (err);
655 }
656
657 dsl_dataset_make_exclusive(ds, FTAG);
658 err = dsl_sync_task_do(dd->dd_pool,
659 recv_full_existing_check,
660 recv_full_existing_sync, ds, &rbsa, 5);
661 dsl_dataset_disown(ds, FTAG);
662 } else {
663 err = dsl_sync_task_do(dd->dd_pool, recv_full_check,
664 recv_full_sync, dd, &rbsa, 5);
665 }
666 dsl_dir_close(dd, FTAG);
667 if (err)
668 return (err);
669 drc->drc_logical_ds = drc->drc_real_ds = rbsa.ds;
670 drc->drc_newfs = B_TRUE;
671 }
672
673 return (0);
674 }
675
676 struct restorearg {
677 int err;
678 int byteswap;
679 vnode_t *vp;
680 char *buf;
681 uint64_t voff;
682 int bufsize; /* amount of memory allocated for buf */
683 zio_cksum_t cksum;
684 };
685
686 static void *
687 restore_read(struct restorearg *ra, int len)
688 {
689 void *rv;
690 int done = 0;
691
692 /* some things will require 8-byte alignment, so everything must */
693 ASSERT3U(len % 8, ==, 0);
694
695 while (done < len) {
696 ssize_t resid;
697
698 ra->err = vn_rdwr(UIO_READ, ra->vp,
699 (caddr_t)ra->buf + done, len - done,
700 ra->voff, UIO_SYSSPACE, FAPPEND,
701 RLIM64_INFINITY, CRED(), &resid);
702
703 if (resid == len - done)
704 ra->err = EINVAL;
705 ra->voff += len - done - resid;
706 done = len - resid;
707 if (ra->err)
708 return (NULL);
709 }
710
711 ASSERT3U(done, ==, len);
712 rv = ra->buf;
713 if (ra->byteswap)
714 fletcher_4_incremental_byteswap(rv, len, &ra->cksum);
715 else
716 fletcher_4_incremental_native(rv, len, &ra->cksum);
717 return (rv);
718 }
719
720 static void
721 backup_byteswap(dmu_replay_record_t *drr)
722 {
723 #define DO64(X) (drr->drr_u.X = BSWAP_64(drr->drr_u.X))
724 #define DO32(X) (drr->drr_u.X = BSWAP_32(drr->drr_u.X))
725 drr->drr_type = BSWAP_32(drr->drr_type);
726 drr->drr_payloadlen = BSWAP_32(drr->drr_payloadlen);
727 switch (drr->drr_type) {
728 case DRR_BEGIN:
729 DO64(drr_begin.drr_magic);
730 DO64(drr_begin.drr_version);
731 DO64(drr_begin.drr_creation_time);
732 DO32(drr_begin.drr_type);
733 DO32(drr_begin.drr_flags);
734 DO64(drr_begin.drr_toguid);
735 DO64(drr_begin.drr_fromguid);
736 break;
737 case DRR_OBJECT:
738 DO64(drr_object.drr_object);
739 /* DO64(drr_object.drr_allocation_txg); */
740 DO32(drr_object.drr_type);
741 DO32(drr_object.drr_bonustype);
742 DO32(drr_object.drr_blksz);
743 DO32(drr_object.drr_bonuslen);
744 break;
745 case DRR_FREEOBJECTS:
746 DO64(drr_freeobjects.drr_firstobj);
747 DO64(drr_freeobjects.drr_numobjs);
748 break;
749 case DRR_WRITE:
750 DO64(drr_write.drr_object);
751 DO32(drr_write.drr_type);
752 DO64(drr_write.drr_offset);
753 DO64(drr_write.drr_length);
754 break;
755 case DRR_FREE:
756 DO64(drr_free.drr_object);
757 DO64(drr_free.drr_offset);
758 DO64(drr_free.drr_length);
759 break;
760 case DRR_END:
761 DO64(drr_end.drr_checksum.zc_word[0]);
762 DO64(drr_end.drr_checksum.zc_word[1]);
763 DO64(drr_end.drr_checksum.zc_word[2]);
764 DO64(drr_end.drr_checksum.zc_word[3]);
765 break;
766 }
767 #undef DO64
768 #undef DO32
769 }
770
771 static int
772 restore_object(struct restorearg *ra, objset_t *os, struct drr_object *drro)
773 {
774 int err;
775 dmu_tx_t *tx;
776 void *data = NULL;
777
778 err = dmu_object_info(os, drro->drr_object, NULL);
779
780 if (err != 0 && err != ENOENT)
781 return (EINVAL);
782
783 if (drro->drr_type == DMU_OT_NONE ||
784 drro->drr_type >= DMU_OT_NUMTYPES ||
785 drro->drr_bonustype >= DMU_OT_NUMTYPES ||
786 drro->drr_checksum >= ZIO_CHECKSUM_FUNCTIONS ||
787 drro->drr_compress >= ZIO_COMPRESS_FUNCTIONS ||
788 P2PHASE(drro->drr_blksz, SPA_MINBLOCKSIZE) ||
789 drro->drr_blksz < SPA_MINBLOCKSIZE ||
790 drro->drr_blksz > SPA_MAXBLOCKSIZE ||
791 drro->drr_bonuslen > DN_MAX_BONUSLEN) {
792 return (EINVAL);
793 }
794
795 if (drro->drr_bonuslen) {
796 data = restore_read(ra, P2ROUNDUP(drro->drr_bonuslen, 8));
797 if (ra->err)
798 return (ra->err);
799 }
800
801 tx = dmu_tx_create(os);
802
803 if (err == ENOENT) {
804 /* currently free, want to be allocated */
805 dmu_tx_hold_bonus(tx, DMU_NEW_OBJECT);
806 dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0, 1);
807 err = dmu_tx_assign(tx, TXG_WAIT);
808 if (err) {
809 dmu_tx_abort(tx);
810 return (err);
811 }
812 err = dmu_object_claim(os, drro->drr_object,
813 drro->drr_type, drro->drr_blksz,
814 drro->drr_bonustype, drro->drr_bonuslen, tx);
815 } else {
816 /* currently allocated, want to be allocated */
817 dmu_tx_hold_bonus(tx, drro->drr_object);
818 /*
819 * We may change blocksize and delete old content,
820 * so need to hold_write and hold_free.
821 */
822 dmu_tx_hold_write(tx, drro->drr_object, 0, 1);
823 dmu_tx_hold_free(tx, drro->drr_object, 0, DMU_OBJECT_END);
824 err = dmu_tx_assign(tx, TXG_WAIT);
825 if (err) {
826 dmu_tx_abort(tx);
827 return (err);
828 }
829
830 err = dmu_object_reclaim(os, drro->drr_object,
831 drro->drr_type, drro->drr_blksz,
832 drro->drr_bonustype, drro->drr_bonuslen, tx);
833 }
834 if (err) {
835 dmu_tx_commit(tx);
836 return (EINVAL);
837 }
838
839 dmu_object_set_checksum(os, drro->drr_object, drro->drr_checksum, tx);
840 dmu_object_set_compress(os, drro->drr_object, drro->drr_compress, tx);
841
842 if (data != NULL) {
843 dmu_buf_t *db;
844
845 VERIFY(0 == dmu_bonus_hold(os, drro->drr_object, FTAG, &db));
846 dmu_buf_will_dirty(db, tx);
847
848 ASSERT3U(db->db_size, >=, drro->drr_bonuslen);
849 bcopy(data, db->db_data, drro->drr_bonuslen);
850 if (ra->byteswap) {
851 dmu_ot[drro->drr_bonustype].ot_byteswap(db->db_data,
852 drro->drr_bonuslen);
853 }
854 dmu_buf_rele(db, FTAG);
855 }
856 dmu_tx_commit(tx);
857 return (0);
858 }
859
860 /* ARGSUSED */
861 static int
862 restore_freeobjects(struct restorearg *ra, objset_t *os,
863 struct drr_freeobjects *drrfo)
864 {
865 uint64_t obj;
866
867 if (drrfo->drr_firstobj + drrfo->drr_numobjs < drrfo->drr_firstobj)
868 return (EINVAL);
869
870 for (obj = drrfo->drr_firstobj;
871 obj < drrfo->drr_firstobj + drrfo->drr_numobjs;
872 (void) dmu_object_next(os, &obj, FALSE, 0)) {
873 int err;
874
875 if (dmu_object_info(os, obj, NULL) != 0)
876 continue;
877
878 err = dmu_free_object(os, obj);
879 if (err)
880 return (err);
881 }
882 return (0);
883 }
884
885 static int
886 restore_write(struct restorearg *ra, objset_t *os,
887 struct drr_write *drrw)
888 {
889 dmu_tx_t *tx;
890 void *data;
891 int err;
892
893 if (drrw->drr_offset + drrw->drr_length < drrw->drr_offset ||
894 drrw->drr_type >= DMU_OT_NUMTYPES)
895 return (EINVAL);
896
897 data = restore_read(ra, drrw->drr_length);
898 if (data == NULL)
899 return (ra->err);
900
901 if (dmu_object_info(os, drrw->drr_object, NULL) != 0)
902 return (EINVAL);
903
904 tx = dmu_tx_create(os);
905
906 dmu_tx_hold_write(tx, drrw->drr_object,
907 drrw->drr_offset, drrw->drr_length);
908 err = dmu_tx_assign(tx, TXG_WAIT);
909 if (err) {
910 dmu_tx_abort(tx);
911 return (err);
912 }
913 if (ra->byteswap)
914 dmu_ot[drrw->drr_type].ot_byteswap(data, drrw->drr_length);
915 dmu_write(os, drrw->drr_object,
916 drrw->drr_offset, drrw->drr_length, data, tx);
917 dmu_tx_commit(tx);
918 return (0);
919 }
920
921 /* ARGSUSED */
922 static int
923 restore_free(struct restorearg *ra, objset_t *os,
924 struct drr_free *drrf)
925 {
926 int err;
927
928 if (drrf->drr_length != -1ULL &&
929 drrf->drr_offset + drrf->drr_length < drrf->drr_offset)
930 return (EINVAL);
931
932 if (dmu_object_info(os, drrf->drr_object, NULL) != 0)
933 return (EINVAL);
934
935 err = dmu_free_long_range(os, drrf->drr_object,
936 drrf->drr_offset, drrf->drr_length);
937 return (err);
938 }
939
940 void
941 dmu_recv_abort_cleanup(dmu_recv_cookie_t *drc)
942 {
943 if (drc->drc_newfs || drc->drc_real_ds != drc->drc_logical_ds) {
944 /*
945 * online incremental or new fs: destroy the fs (which
946 * may be a clone) that we created
947 */
948 (void) dsl_dataset_destroy(drc->drc_real_ds, dmu_recv_tag);
949 if (drc->drc_real_ds != drc->drc_logical_ds)
950 dsl_dataset_rele(drc->drc_logical_ds, dmu_recv_tag);
951 } else {
952 /*
953 * offline incremental: rollback to most recent snapshot.
954 */
955 (void) dsl_dataset_rollback(drc->drc_real_ds, DMU_OST_NONE);
956 dsl_dataset_disown(drc->drc_real_ds, dmu_recv_tag);
957 }
958 }
959
960 /*
961 * NB: callers *must* call dmu_recv_end() if this succeeds.
962 */
963 int
964 dmu_recv_stream(dmu_recv_cookie_t *drc, vnode_t *vp, offset_t *voffp)
965 {
966 struct restorearg ra = { 0 };
967 dmu_replay_record_t *drr;
968 objset_t *os;
969 zio_cksum_t pcksum;
970
971 if (drc->drc_drrb->drr_magic == BSWAP_64(DMU_BACKUP_MAGIC))
972 ra.byteswap = TRUE;
973
974 {
975 /* compute checksum of drr_begin record */
976 dmu_replay_record_t *drr;
977 drr = kmem_zalloc(sizeof (dmu_replay_record_t), KM_SLEEP);
978
979 drr->drr_type = DRR_BEGIN;
980 drr->drr_u.drr_begin = *drc->drc_drrb;
981 if (ra.byteswap) {
982 fletcher_4_incremental_byteswap(drr,
983 sizeof (dmu_replay_record_t), &ra.cksum);
984 } else {
985 fletcher_4_incremental_native(drr,
986 sizeof (dmu_replay_record_t), &ra.cksum);
987 }
988 kmem_free(drr, sizeof (dmu_replay_record_t));
989 }
990
991 if (ra.byteswap) {
992 struct drr_begin *drrb = drc->drc_drrb;
993 drrb->drr_magic = BSWAP_64(drrb->drr_magic);
994 drrb->drr_version = BSWAP_64(drrb->drr_version);
995 drrb->drr_creation_time = BSWAP_64(drrb->drr_creation_time);
996 drrb->drr_type = BSWAP_32(drrb->drr_type);
997 drrb->drr_toguid = BSWAP_64(drrb->drr_toguid);
998 drrb->drr_fromguid = BSWAP_64(drrb->drr_fromguid);
999 }
1000
1001 ra.vp = vp;
1002 ra.voff = *voffp;
1003 ra.bufsize = 1<<20;
1004 ra.buf = kmem_alloc(ra.bufsize, KM_SLEEP);
1005
1006 /* these were verified in dmu_recv_begin */
1007 ASSERT(drc->drc_drrb->drr_version == DMU_BACKUP_STREAM_VERSION);
1008 ASSERT(drc->drc_drrb->drr_type < DMU_OST_NUMTYPES);
1009
1010 /*
1011 * Open the objset we are modifying.
1012 */
1013 VERIFY(dmu_objset_open_ds(drc->drc_real_ds, DMU_OST_ANY, &os) == 0);
1014
1015 ASSERT(drc->drc_real_ds->ds_phys->ds_flags & DS_FLAG_INCONSISTENT);
1016
1017 /*
1018 * Read records and process them.
1019 */
1020 pcksum = ra.cksum;
1021 while (ra.err == 0 &&
1022 NULL != (drr = restore_read(&ra, sizeof (*drr)))) {
1023 if (issig(JUSTLOOKING) && issig(FORREAL)) {
1024 ra.err = EINTR;
1025 goto out;
1026 }
1027
1028 if (ra.byteswap)
1029 backup_byteswap(drr);
1030
1031 switch (drr->drr_type) {
1032 case DRR_OBJECT:
1033 {
1034 /*
1035 * We need to make a copy of the record header,
1036 * because restore_{object,write} may need to
1037 * restore_read(), which will invalidate drr.
1038 */
1039 struct drr_object drro = drr->drr_u.drr_object;
1040 ra.err = restore_object(&ra, os, &drro);
1041 break;
1042 }
1043 case DRR_FREEOBJECTS:
1044 {
1045 struct drr_freeobjects drrfo =
1046 drr->drr_u.drr_freeobjects;
1047 ra.err = restore_freeobjects(&ra, os, &drrfo);
1048 break;
1049 }
1050 case DRR_WRITE:
1051 {
1052 struct drr_write drrw = drr->drr_u.drr_write;
1053 ra.err = restore_write(&ra, os, &drrw);
1054 break;
1055 }
1056 case DRR_FREE:
1057 {
1058 struct drr_free drrf = drr->drr_u.drr_free;
1059 ra.err = restore_free(&ra, os, &drrf);
1060 break;
1061 }
1062 case DRR_END:
1063 {
1064 struct drr_end drre = drr->drr_u.drr_end;
1065 /*
1066 * We compare against the *previous* checksum
1067 * value, because the stored checksum is of
1068 * everything before the DRR_END record.
1069 */
1070 if (!ZIO_CHECKSUM_EQUAL(drre.drr_checksum, pcksum))
1071 ra.err = ECKSUM;
1072 goto out;
1073 }
1074 default:
1075 ra.err = EINVAL;
1076 goto out;
1077 }
1078 pcksum = ra.cksum;
1079 }
1080 ASSERT(ra.err != 0);
1081
1082 out:
1083 dmu_objset_close(os);
1084
1085 if (ra.err != 0) {
1086 /*
1087 * rollback or destroy what we created, so we don't
1088 * leave it in the restoring state.
1089 */
1090 txg_wait_synced(drc->drc_real_ds->ds_dir->dd_pool, 0);
1091 dmu_recv_abort_cleanup(drc);
1092 }
1093
1094 kmem_free(ra.buf, ra.bufsize);
1095 *voffp = ra.voff;
1096 return (ra.err);
1097 }
1098
1099 struct recvendsyncarg {
1100 char *tosnap;
1101 uint64_t creation_time;
1102 uint64_t toguid;
1103 };
1104
1105 static int
1106 recv_end_check(void *arg1, void *arg2, dmu_tx_t *tx)
1107 {
1108 dsl_dataset_t *ds = arg1;
1109 struct recvendsyncarg *resa = arg2;
1110
1111 return (dsl_dataset_snapshot_check(ds, resa->tosnap, tx));
1112 }
1113
1114 static void
1115 recv_end_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx)
1116 {
1117 dsl_dataset_t *ds = arg1;
1118 struct recvendsyncarg *resa = arg2;
1119
1120 dsl_dataset_snapshot_sync(ds, resa->tosnap, cr, tx);
1121
1122 /* set snapshot's creation time and guid */
1123 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx);
1124 ds->ds_prev->ds_phys->ds_creation_time = resa->creation_time;
1125 ds->ds_prev->ds_phys->ds_guid = resa->toguid;
1126 ds->ds_prev->ds_phys->ds_flags &= ~DS_FLAG_INCONSISTENT;
1127
1128 dmu_buf_will_dirty(ds->ds_dbuf, tx);
1129 ds->ds_phys->ds_flags &= ~DS_FLAG_INCONSISTENT;
1130 }
1131
1132 int
1133 dmu_recv_end(dmu_recv_cookie_t *drc)
1134 {
1135 struct recvendsyncarg resa;
1136 dsl_dataset_t *ds = drc->drc_logical_ds;
1137 int err;
1138
1139 /*
1140 * XXX hack; seems the ds is still dirty and
1141 * dsl_pool_zil_clean() expects it to have a ds_user_ptr
1142 * (and zil), but clone_swap() can close it.
1143 */
1144 txg_wait_synced(ds->ds_dir->dd_pool, 0);
1145
1146 if (ds != drc->drc_real_ds) {
1147 /* we are doing an online recv */
1148 if (dsl_dataset_tryown(ds, FALSE, dmu_recv_tag)) {
1149 err = dsl_dataset_clone_swap(drc->drc_real_ds, ds,
1150 drc->drc_force);
1151 if (err)
1152 dsl_dataset_disown(ds, dmu_recv_tag);
1153 } else {
1154 err = EBUSY;
1155 dsl_dataset_rele(ds, dmu_recv_tag);
1156 }
1157 /* dsl_dataset_destroy() will disown the ds */
1158 (void) dsl_dataset_destroy(drc->drc_real_ds, dmu_recv_tag);
1159 if (err)
1160 return (err);
1161 }
1162
1163 resa.creation_time = drc->drc_drrb->drr_creation_time;
1164 resa.toguid = drc->drc_drrb->drr_toguid;
1165 resa.tosnap = drc->drc_tosnap;
1166
1167 err = dsl_sync_task_do(ds->ds_dir->dd_pool,
1168 recv_end_check, recv_end_sync, ds, &resa, 3);
1169 if (err) {
1170 if (drc->drc_newfs) {
1171 ASSERT(ds == drc->drc_real_ds);
1172 (void) dsl_dataset_destroy(ds, dmu_recv_tag);
1173 return (err);
1174 } else {
1175 (void) dsl_dataset_rollback(ds, DMU_OST_NONE);
1176 }
1177 }
1178
1179 /* release the hold from dmu_recv_begin */
1180 dsl_dataset_disown(ds, dmu_recv_tag);
1181 return (err);
1182 }
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