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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 (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
23 */
24
25 #include <sys/dmu.h>
26 #include <sys/dmu_impl.h>
27 #include <sys/dmu_tx.h>
28 #include <sys/dbuf.h>
29 #include <sys/dnode.h>
30 #include <sys/zfs_context.h>
31 #include <sys/dmu_objset.h>
32 #include <sys/dmu_traverse.h>
33 #include <sys/dsl_dataset.h>
34 #include <sys/dsl_dir.h>
35 #include <sys/dsl_prop.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 #include <sys/zfs_znode.h>
42 #include <zfs_fletcher.h>
43 #include <sys/avl.h>
44 #include <sys/ddt.h>
45 #include <sys/zfs_onexit.h>
46
47 static char *dmu_recv_tag = "dmu_recv_tag";
48
49 /*
50 * The list of data whose inclusion in a send stream can be pending from
51 * one call to backup_cb to another. Multiple calls to dump_free() and
52 * dump_freeobjects() can be aggregated into a single DRR_FREE or
53 * DRR_FREEOBJECTS replay record.
54 */
55 typedef enum {
56 PENDING_NONE,
57 PENDING_FREE,
58 PENDING_FREEOBJECTS
59 } pendop_t;
60
61 struct backuparg {
62 dmu_replay_record_t *drr;
63 vnode_t *vp;
64 offset_t *off;
65 objset_t *os;
66 zio_cksum_t zc;
67 uint64_t toguid;
68 int err;
69 pendop_t pending_op;
70 };
71
72 static int
73 dump_bytes(struct backuparg *ba, void *buf, int len)
74 {
75 ssize_t resid; /* have to get resid to get detailed errno */
76 ASSERT3U(len % 8, ==, 0);
77
78 fletcher_4_incremental_native(buf, len, &ba->zc);
79 ba->err = vn_rdwr(UIO_WRITE, ba->vp,
80 (caddr_t)buf, len,
81 0, UIO_SYSSPACE, FAPPEND, RLIM64_INFINITY, CRED(), &resid);
82 *ba->off += len;
83 return (ba->err);
84 }
85
86 static int
87 dump_free(struct backuparg *ba, uint64_t object, uint64_t offset,
88 uint64_t length)
89 {
90 struct drr_free *drrf = &(ba->drr->drr_u.drr_free);
91
92 /*
93 * If there is a pending op, but it's not PENDING_FREE, push it out,
94 * since free block aggregation can only be done for blocks of the
95 * same type (i.e., DRR_FREE records can only be aggregated with
96 * other DRR_FREE records. DRR_FREEOBJECTS records can only be
97 * aggregated with other DRR_FREEOBJECTS records.
98 */
99 if (ba->pending_op != PENDING_NONE && ba->pending_op != PENDING_FREE) {
100 if (dump_bytes(ba, ba->drr, sizeof (dmu_replay_record_t)) != 0)
101 return (EINTR);
102 ba->pending_op = PENDING_NONE;
103 }
104
105 if (ba->pending_op == PENDING_FREE) {
106 /*
107 * There should never be a PENDING_FREE if length is -1
108 * (because dump_dnode is the only place where this
109 * function is called with a -1, and only after flushing
110 * any pending record).
111 */
112 ASSERT(length != -1ULL);
113 /*
114 * Check to see whether this free block can be aggregated
115 * with pending one.
116 */
117 if (drrf->drr_object == object && drrf->drr_offset +
118 drrf->drr_length == offset) {
119 drrf->drr_length += length;
120 return (0);
121 } else {
122 /* not a continuation. Push out pending record */
123 if (dump_bytes(ba, ba->drr,
124 sizeof (dmu_replay_record_t)) != 0)
125 return (EINTR);
126 ba->pending_op = PENDING_NONE;
127 }
128 }
129 /* create a FREE record and make it pending */
130 bzero(ba->drr, sizeof (dmu_replay_record_t));
131 ba->drr->drr_type = DRR_FREE;
132 drrf->drr_object = object;
133 drrf->drr_offset = offset;
134 drrf->drr_length = length;
135 drrf->drr_toguid = ba->toguid;
136 if (length == -1ULL) {
137 if (dump_bytes(ba, ba->drr, sizeof (dmu_replay_record_t)) != 0)
138 return (EINTR);
139 } else {
140 ba->pending_op = PENDING_FREE;
141 }
142
143 return (0);
144 }
145
146 static int
147 dump_data(struct backuparg *ba, dmu_object_type_t type,
148 uint64_t object, uint64_t offset, int blksz, const blkptr_t *bp, void *data)
149 {
150 struct drr_write *drrw = &(ba->drr->drr_u.drr_write);
151
152
153 /*
154 * If there is any kind of pending aggregation (currently either
155 * a grouping of free objects or free blocks), push it out to
156 * the stream, since aggregation can't be done across operations
157 * of different types.
158 */
159 if (ba->pending_op != PENDING_NONE) {
160 if (dump_bytes(ba, ba->drr, sizeof (dmu_replay_record_t)) != 0)
161 return (EINTR);
162 ba->pending_op = PENDING_NONE;
163 }
164 /* write a DATA record */
165 bzero(ba->drr, sizeof (dmu_replay_record_t));
166 ba->drr->drr_type = DRR_WRITE;
167 drrw->drr_object = object;
168 drrw->drr_type = type;
169 drrw->drr_offset = offset;
170 drrw->drr_length = blksz;
171 drrw->drr_toguid = ba->toguid;
172 drrw->drr_checksumtype = BP_GET_CHECKSUM(bp);
173 if (zio_checksum_table[drrw->drr_checksumtype].ci_dedup)
174 drrw->drr_checksumflags |= DRR_CHECKSUM_DEDUP;
175 DDK_SET_LSIZE(&drrw->drr_key, BP_GET_LSIZE(bp));
176 DDK_SET_PSIZE(&drrw->drr_key, BP_GET_PSIZE(bp));
177 DDK_SET_COMPRESS(&drrw->drr_key, BP_GET_COMPRESS(bp));
178 drrw->drr_key.ddk_cksum = bp->blk_cksum;
179
180 if (dump_bytes(ba, ba->drr, sizeof (dmu_replay_record_t)) != 0)
181 return (EINTR);
182 if (dump_bytes(ba, data, blksz) != 0)
183 return (EINTR);
184 return (0);
185 }
186
187 static int
188 dump_spill(struct backuparg *ba, uint64_t object, int blksz, void *data)
189 {
190 struct drr_spill *drrs = &(ba->drr->drr_u.drr_spill);
191
192 if (ba->pending_op != PENDING_NONE) {
193 if (dump_bytes(ba, ba->drr, sizeof (dmu_replay_record_t)) != 0)
194 return (EINTR);
195 ba->pending_op = PENDING_NONE;
196 }
197
198 /* write a SPILL record */
199 bzero(ba->drr, sizeof (dmu_replay_record_t));
200 ba->drr->drr_type = DRR_SPILL;
201 drrs->drr_object = object;
202 drrs->drr_length = blksz;
203 drrs->drr_toguid = ba->toguid;
204
205 if (dump_bytes(ba, ba->drr, sizeof (dmu_replay_record_t)))
206 return (EINTR);
207 if (dump_bytes(ba, data, blksz))
208 return (EINTR);
209 return (0);
210 }
211
212 static int
213 dump_freeobjects(struct backuparg *ba, uint64_t firstobj, uint64_t numobjs)
214 {
215 struct drr_freeobjects *drrfo = &(ba->drr->drr_u.drr_freeobjects);
216
217 /*
218 * If there is a pending op, but it's not PENDING_FREEOBJECTS,
219 * push it out, since free block aggregation can only be done for
220 * blocks of the same type (i.e., DRR_FREE records can only be
221 * aggregated with other DRR_FREE records. DRR_FREEOBJECTS records
222 * can only be aggregated with other DRR_FREEOBJECTS records.
223 */
224 if (ba->pending_op != PENDING_NONE &&
225 ba->pending_op != PENDING_FREEOBJECTS) {
226 if (dump_bytes(ba, ba->drr, sizeof (dmu_replay_record_t)) != 0)
227 return (EINTR);
228 ba->pending_op = PENDING_NONE;
229 }
230 if (ba->pending_op == PENDING_FREEOBJECTS) {
231 /*
232 * See whether this free object array can be aggregated
233 * with pending one
234 */
235 if (drrfo->drr_firstobj + drrfo->drr_numobjs == firstobj) {
236 drrfo->drr_numobjs += numobjs;
237 return (0);
238 } else {
239 /* can't be aggregated. Push out pending record */
240 if (dump_bytes(ba, ba->drr,
241 sizeof (dmu_replay_record_t)) != 0)
242 return (EINTR);
243 ba->pending_op = PENDING_NONE;
244 }
245 }
246
247 /* write a FREEOBJECTS record */
248 bzero(ba->drr, sizeof (dmu_replay_record_t));
249 ba->drr->drr_type = DRR_FREEOBJECTS;
250 drrfo->drr_firstobj = firstobj;
251 drrfo->drr_numobjs = numobjs;
252 drrfo->drr_toguid = ba->toguid;
253
254 ba->pending_op = PENDING_FREEOBJECTS;
255
256 return (0);
257 }
258
259 static int
260 dump_dnode(struct backuparg *ba, uint64_t object, dnode_phys_t *dnp)
261 {
262 struct drr_object *drro = &(ba->drr->drr_u.drr_object);
263
264 if (dnp == NULL || dnp->dn_type == DMU_OT_NONE)
265 return (dump_freeobjects(ba, object, 1));
266
267 if (ba->pending_op != PENDING_NONE) {
268 if (dump_bytes(ba, ba->drr, sizeof (dmu_replay_record_t)) != 0)
269 return (EINTR);
270 ba->pending_op = PENDING_NONE;
271 }
272
273 /* write an OBJECT record */
274 bzero(ba->drr, sizeof (dmu_replay_record_t));
275 ba->drr->drr_type = DRR_OBJECT;
276 drro->drr_object = object;
277 drro->drr_type = dnp->dn_type;
278 drro->drr_bonustype = dnp->dn_bonustype;
279 drro->drr_blksz = dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT;
280 drro->drr_bonuslen = dnp->dn_bonuslen;
281 drro->drr_checksumtype = dnp->dn_checksum;
282 drro->drr_compress = dnp->dn_compress;
283 drro->drr_toguid = ba->toguid;
284
285 if (dump_bytes(ba, ba->drr, sizeof (dmu_replay_record_t)) != 0)
286 return (EINTR);
287
288 if (dump_bytes(ba, DN_BONUS(dnp), P2ROUNDUP(dnp->dn_bonuslen, 8)) != 0)
289 return (EINTR);
290
291 /* free anything past the end of the file */
292 if (dump_free(ba, object, (dnp->dn_maxblkid + 1) *
293 (dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT), -1ULL))
294 return (EINTR);
295 if (ba->err)
296 return (EINTR);
297 return (0);
298 }
299
300 #define BP_SPAN(dnp, level) \
301 (((uint64_t)dnp->dn_datablkszsec) << (SPA_MINBLOCKSHIFT + \
302 (level) * (dnp->dn_indblkshift - SPA_BLKPTRSHIFT)))
303
304 /* ARGSUSED */
305 static int
306 backup_cb(spa_t *spa, zilog_t *zilog, const blkptr_t *bp, arc_buf_t *pbuf,
307 const zbookmark_t *zb, const dnode_phys_t *dnp, void *arg)
308 {
309 struct backuparg *ba = arg;
310 dmu_object_type_t type = bp ? BP_GET_TYPE(bp) : DMU_OT_NONE;
311 int err = 0;
312
313 if (issig(JUSTLOOKING) && issig(FORREAL))
314 return (EINTR);
315
316 if (zb->zb_object != DMU_META_DNODE_OBJECT &&
317 DMU_OBJECT_IS_SPECIAL(zb->zb_object)) {
318 return (0);
319 } else if (bp == NULL && zb->zb_object == DMU_META_DNODE_OBJECT) {
320 uint64_t span = BP_SPAN(dnp, zb->zb_level);
321 uint64_t dnobj = (zb->zb_blkid * span) >> DNODE_SHIFT;
322 err = dump_freeobjects(ba, dnobj, span >> DNODE_SHIFT);
323 } else if (bp == NULL) {
324 uint64_t span = BP_SPAN(dnp, zb->zb_level);
325 err = dump_free(ba, zb->zb_object, zb->zb_blkid * span, span);
326 } else if (zb->zb_level > 0 || type == DMU_OT_OBJSET) {
327 return (0);
328 } else if (type == DMU_OT_DNODE) {
329 dnode_phys_t *blk;
330 int i;
331 int blksz = BP_GET_LSIZE(bp);
332 uint32_t aflags = ARC_WAIT;
333 arc_buf_t *abuf;
334
335 if (dsl_read(NULL, spa, bp, pbuf,
336 arc_getbuf_func, &abuf, ZIO_PRIORITY_ASYNC_READ,
337 ZIO_FLAG_CANFAIL, &aflags, zb) != 0)
338 return (EIO);
339
340 blk = abuf->b_data;
341 for (i = 0; i < blksz >> DNODE_SHIFT; i++) {
342 uint64_t dnobj = (zb->zb_blkid <<
343 (DNODE_BLOCK_SHIFT - DNODE_SHIFT)) + i;
344 err = dump_dnode(ba, dnobj, blk+i);
345 if (err)
346 break;
347 }
348 (void) arc_buf_remove_ref(abuf, &abuf);
349 } else if (type == DMU_OT_SA) {
350 uint32_t aflags = ARC_WAIT;
351 arc_buf_t *abuf;
352 int blksz = BP_GET_LSIZE(bp);
353
354 if (arc_read_nolock(NULL, spa, bp,
355 arc_getbuf_func, &abuf, ZIO_PRIORITY_ASYNC_READ,
356 ZIO_FLAG_CANFAIL, &aflags, zb) != 0)
357 return (EIO);
358
359 err = dump_spill(ba, zb->zb_object, blksz, abuf->b_data);
360 (void) arc_buf_remove_ref(abuf, &abuf);
361 } else { /* it's a level-0 block of a regular object */
362 uint32_t aflags = ARC_WAIT;
363 arc_buf_t *abuf;
364 int blksz = BP_GET_LSIZE(bp);
365
366 if (dsl_read(NULL, spa, bp, pbuf,
367 arc_getbuf_func, &abuf, ZIO_PRIORITY_ASYNC_READ,
368 ZIO_FLAG_CANFAIL, &aflags, zb) != 0)
369 return (EIO);
370
371 err = dump_data(ba, type, zb->zb_object, zb->zb_blkid * blksz,
372 blksz, bp, abuf->b_data);
373 (void) arc_buf_remove_ref(abuf, &abuf);
374 }
375
376 ASSERT(err == 0 || err == EINTR);
377 return (err);
378 }
379
380 int
381 dmu_sendbackup(objset_t *tosnap, objset_t *fromsnap, boolean_t fromorigin,
382 vnode_t *vp, offset_t *off)
383 {
384 dsl_dataset_t *ds = tosnap->os_dsl_dataset;
385 dsl_dataset_t *fromds = fromsnap ? fromsnap->os_dsl_dataset : NULL;
386 dmu_replay_record_t *drr;
387 struct backuparg ba;
388 int err;
389 uint64_t fromtxg = 0;
390
391 /* tosnap must be a snapshot */
392 if (ds->ds_phys->ds_next_snap_obj == 0)
393 return (EINVAL);
394
395 /* fromsnap must be an earlier snapshot from the same fs as tosnap */
396 if (fromds && (ds->ds_dir != fromds->ds_dir ||
397 fromds->ds_phys->ds_creation_txg >= ds->ds_phys->ds_creation_txg))
398 return (EXDEV);
399
400 if (fromorigin) {
401 dsl_pool_t *dp = ds->ds_dir->dd_pool;
402
403 if (fromsnap)
404 return (EINVAL);
405
406 if (dsl_dir_is_clone(ds->ds_dir)) {
407 rw_enter(&dp->dp_config_rwlock, RW_READER);
408 err = dsl_dataset_hold_obj(dp,
409 ds->ds_dir->dd_phys->dd_origin_obj, FTAG, &fromds);
410 rw_exit(&dp->dp_config_rwlock);
411 if (err)
412 return (err);
413 } else {
414 fromorigin = B_FALSE;
415 }
416 }
417
418
419 drr = kmem_zalloc(sizeof (dmu_replay_record_t), KM_SLEEP);
420 drr->drr_type = DRR_BEGIN;
421 drr->drr_u.drr_begin.drr_magic = DMU_BACKUP_MAGIC;
422 DMU_SET_STREAM_HDRTYPE(drr->drr_u.drr_begin.drr_versioninfo,
423 DMU_SUBSTREAM);
424
425 #ifdef _KERNEL
426 if (dmu_objset_type(tosnap) == DMU_OST_ZFS) {
427 uint64_t version;
428 if (zfs_get_zplprop(tosnap, ZFS_PROP_VERSION, &version) != 0)
429 return (EINVAL);
430 if (version == ZPL_VERSION_SA) {
431 DMU_SET_FEATUREFLAGS(
432 drr->drr_u.drr_begin.drr_versioninfo,
433 DMU_BACKUP_FEATURE_SA_SPILL);
434 }
435 }
436 #endif
437
438 drr->drr_u.drr_begin.drr_creation_time =
439 ds->ds_phys->ds_creation_time;
440 drr->drr_u.drr_begin.drr_type = tosnap->os_phys->os_type;
441 if (fromorigin)
442 drr->drr_u.drr_begin.drr_flags |= DRR_FLAG_CLONE;
443 drr->drr_u.drr_begin.drr_toguid = ds->ds_phys->ds_guid;
444 if (ds->ds_phys->ds_flags & DS_FLAG_CI_DATASET)
445 drr->drr_u.drr_begin.drr_flags |= DRR_FLAG_CI_DATA;
446
447 if (fromds)
448 drr->drr_u.drr_begin.drr_fromguid = fromds->ds_phys->ds_guid;
449 dsl_dataset_name(ds, drr->drr_u.drr_begin.drr_toname);
450
451 if (fromds)
452 fromtxg = fromds->ds_phys->ds_creation_txg;
453 if (fromorigin)
454 dsl_dataset_rele(fromds, FTAG);
455
456 ba.drr = drr;
457 ba.vp = vp;
458 ba.os = tosnap;
459 ba.off = off;
460 ba.toguid = ds->ds_phys->ds_guid;
461 ZIO_SET_CHECKSUM(&ba.zc, 0, 0, 0, 0);
462 ba.pending_op = PENDING_NONE;
463
464 if (dump_bytes(&ba, drr, sizeof (dmu_replay_record_t)) != 0) {
465 kmem_free(drr, sizeof (dmu_replay_record_t));
466 return (ba.err);
467 }
468
469 err = traverse_dataset(ds, fromtxg, TRAVERSE_PRE | TRAVERSE_PREFETCH,
470 backup_cb, &ba);
471
472 if (ba.pending_op != PENDING_NONE)
473 if (dump_bytes(&ba, drr, sizeof (dmu_replay_record_t)) != 0)
474 err = EINTR;
475
476 if (err) {
477 if (err == EINTR && ba.err)
478 err = ba.err;
479 kmem_free(drr, sizeof (dmu_replay_record_t));
480 return (err);
481 }
482
483 bzero(drr, sizeof (dmu_replay_record_t));
484 drr->drr_type = DRR_END;
485 drr->drr_u.drr_end.drr_checksum = ba.zc;
486 drr->drr_u.drr_end.drr_toguid = ba.toguid;
487
488 if (dump_bytes(&ba, drr, sizeof (dmu_replay_record_t)) != 0) {
489 kmem_free(drr, sizeof (dmu_replay_record_t));
490 return (ba.err);
491 }
492
493 kmem_free(drr, sizeof (dmu_replay_record_t));
494
495 return (0);
496 }
497
498 struct recvbeginsyncarg {
499 const char *tofs;
500 const char *tosnap;
501 dsl_dataset_t *origin;
502 uint64_t fromguid;
503 dmu_objset_type_t type;
504 void *tag;
505 boolean_t force;
506 uint64_t dsflags;
507 char clonelastname[MAXNAMELEN];
508 dsl_dataset_t *ds; /* the ds to recv into; returned from the syncfunc */
509 cred_t *cr;
510 };
511
512 /* ARGSUSED */
513 static int
514 recv_new_check(void *arg1, void *arg2, dmu_tx_t *tx)
515 {
516 dsl_dir_t *dd = arg1;
517 struct recvbeginsyncarg *rbsa = arg2;
518 objset_t *mos = dd->dd_pool->dp_meta_objset;
519 uint64_t val;
520 int err;
521
522 err = zap_lookup(mos, dd->dd_phys->dd_child_dir_zapobj,
523 strrchr(rbsa->tofs, '/') + 1, sizeof (uint64_t), 1, &val);
524
525 if (err != ENOENT)
526 return (err ? err : EEXIST);
527
528 if (rbsa->origin) {
529 /* make sure it's a snap in the same pool */
530 if (rbsa->origin->ds_dir->dd_pool != dd->dd_pool)
531 return (EXDEV);
532 if (!dsl_dataset_is_snapshot(rbsa->origin))
533 return (EINVAL);
534 if (rbsa->origin->ds_phys->ds_guid != rbsa->fromguid)
535 return (ENODEV);
536 }
537
538 return (0);
539 }
540
541 static void
542 recv_new_sync(void *arg1, void *arg2, dmu_tx_t *tx)
543 {
544 dsl_dir_t *dd = arg1;
545 struct recvbeginsyncarg *rbsa = arg2;
546 uint64_t flags = DS_FLAG_INCONSISTENT | rbsa->dsflags;
547 uint64_t dsobj;
548
549 /* Create and open new dataset. */
550 dsobj = dsl_dataset_create_sync(dd, strrchr(rbsa->tofs, '/') + 1,
551 rbsa->origin, flags, rbsa->cr, tx);
552 VERIFY(0 == dsl_dataset_own_obj(dd->dd_pool, dsobj,
553 B_TRUE, dmu_recv_tag, &rbsa->ds));
554
555 if (rbsa->origin == NULL) {
556 (void) dmu_objset_create_impl(dd->dd_pool->dp_spa,
557 rbsa->ds, &rbsa->ds->ds_phys->ds_bp, rbsa->type, tx);
558 }
559
560 spa_history_log_internal(LOG_DS_REPLAY_FULL_SYNC,
561 dd->dd_pool->dp_spa, tx, "dataset = %lld", dsobj);
562 }
563
564 /* ARGSUSED */
565 static int
566 recv_existing_check(void *arg1, void *arg2, dmu_tx_t *tx)
567 {
568 dsl_dataset_t *ds = arg1;
569 struct recvbeginsyncarg *rbsa = arg2;
570 int err;
571 uint64_t val;
572
573 /* must not have any changes since most recent snapshot */
574 if (!rbsa->force && dsl_dataset_modified_since_lastsnap(ds))
575 return (ETXTBSY);
576
577 /* new snapshot name must not exist */
578 err = zap_lookup(ds->ds_dir->dd_pool->dp_meta_objset,
579 ds->ds_phys->ds_snapnames_zapobj, rbsa->tosnap, 8, 1, &val);
580 if (err == 0)
581 return (EEXIST);
582 if (err != ENOENT)
583 return (err);
584
585 if (rbsa->fromguid) {
586 /* if incremental, most recent snapshot must match fromguid */
587 if (ds->ds_prev == NULL)
588 return (ENODEV);
589
590 /*
591 * most recent snapshot must match fromguid, or there are no
592 * changes since the fromguid one
593 */
594 if (ds->ds_prev->ds_phys->ds_guid != rbsa->fromguid) {
595 uint64_t birth = ds->ds_prev->ds_phys->ds_bp.blk_birth;
596 uint64_t obj = ds->ds_prev->ds_phys->ds_prev_snap_obj;
597 while (obj != 0) {
598 dsl_dataset_t *snap;
599 err = dsl_dataset_hold_obj(ds->ds_dir->dd_pool,
600 obj, FTAG, &snap);
601 if (err)
602 return (ENODEV);
603 if (snap->ds_phys->ds_creation_txg < birth) {
604 dsl_dataset_rele(snap, FTAG);
605 return (ENODEV);
606 }
607 if (snap->ds_phys->ds_guid == rbsa->fromguid) {
608 dsl_dataset_rele(snap, FTAG);
609 break; /* it's ok */
610 }
611 obj = snap->ds_phys->ds_prev_snap_obj;
612 dsl_dataset_rele(snap, FTAG);
613 }
614 if (obj == 0)
615 return (ENODEV);
616 }
617 } else {
618 /* if full, most recent snapshot must be $ORIGIN */
619 if (ds->ds_phys->ds_prev_snap_txg >= TXG_INITIAL)
620 return (ENODEV);
621 }
622
623 /* temporary clone name must not exist */
624 err = zap_lookup(ds->ds_dir->dd_pool->dp_meta_objset,
625 ds->ds_dir->dd_phys->dd_child_dir_zapobj,
626 rbsa->clonelastname, 8, 1, &val);
627 if (err == 0)
628 return (EEXIST);
629 if (err != ENOENT)
630 return (err);
631
632 return (0);
633 }
634
635 /* ARGSUSED */
636 static void
637 recv_existing_sync(void *arg1, void *arg2, dmu_tx_t *tx)
638 {
639 dsl_dataset_t *ohds = arg1;
640 struct recvbeginsyncarg *rbsa = arg2;
641 dsl_pool_t *dp = ohds->ds_dir->dd_pool;
642 dsl_dataset_t *cds;
643 uint64_t flags = DS_FLAG_INCONSISTENT | rbsa->dsflags;
644 uint64_t dsobj;
645
646 /* create and open the temporary clone */
647 dsobj = dsl_dataset_create_sync(ohds->ds_dir, rbsa->clonelastname,
648 ohds->ds_prev, flags, rbsa->cr, tx);
649 VERIFY(0 == dsl_dataset_own_obj(dp, dsobj, B_TRUE, dmu_recv_tag, &cds));
650
651 /*
652 * If we actually created a non-clone, we need to create the
653 * objset in our new dataset.
654 */
655 if (BP_IS_HOLE(dsl_dataset_get_blkptr(cds))) {
656 (void) dmu_objset_create_impl(dp->dp_spa,
657 cds, dsl_dataset_get_blkptr(cds), rbsa->type, tx);
658 }
659
660 rbsa->ds = cds;
661
662 spa_history_log_internal(LOG_DS_REPLAY_INC_SYNC,
663 dp->dp_spa, tx, "dataset = %lld", dsobj);
664 }
665
666 static boolean_t
667 dmu_recv_verify_features(dsl_dataset_t *ds, struct drr_begin *drrb)
668 {
669 int featureflags;
670
671 featureflags = DMU_GET_FEATUREFLAGS(drrb->drr_versioninfo);
672
673 /* Verify pool version supports SA if SA_SPILL feature set */
674 return ((featureflags & DMU_BACKUP_FEATURE_SA_SPILL) &&
675 (spa_version(dsl_dataset_get_spa(ds)) < SPA_VERSION_SA));
676 }
677
678 /*
679 * NB: callers *MUST* call dmu_recv_stream() if dmu_recv_begin()
680 * succeeds; otherwise we will leak the holds on the datasets.
681 */
682 int
683 dmu_recv_begin(char *tofs, char *tosnap, char *top_ds, struct drr_begin *drrb,
684 boolean_t force, objset_t *origin, dmu_recv_cookie_t *drc)
685 {
686 int err = 0;
687 boolean_t byteswap;
688 struct recvbeginsyncarg rbsa = { 0 };
689 uint64_t versioninfo;
690 int flags;
691 dsl_dataset_t *ds;
692
693 if (drrb->drr_magic == DMU_BACKUP_MAGIC)
694 byteswap = FALSE;
695 else if (drrb->drr_magic == BSWAP_64(DMU_BACKUP_MAGIC))
696 byteswap = TRUE;
697 else
698 return (EINVAL);
699
700 rbsa.tofs = tofs;
701 rbsa.tosnap = tosnap;
702 rbsa.origin = origin ? origin->os_dsl_dataset : NULL;
703 rbsa.fromguid = drrb->drr_fromguid;
704 rbsa.type = drrb->drr_type;
705 rbsa.tag = FTAG;
706 rbsa.dsflags = 0;
707 rbsa.cr = CRED();
708 versioninfo = drrb->drr_versioninfo;
709 flags = drrb->drr_flags;
710
711 if (byteswap) {
712 rbsa.type = BSWAP_32(rbsa.type);
713 rbsa.fromguid = BSWAP_64(rbsa.fromguid);
714 versioninfo = BSWAP_64(versioninfo);
715 flags = BSWAP_32(flags);
716 }
717
718 if (DMU_GET_STREAM_HDRTYPE(versioninfo) == DMU_COMPOUNDSTREAM ||
719 rbsa.type >= DMU_OST_NUMTYPES ||
720 ((flags & DRR_FLAG_CLONE) && origin == NULL))
721 return (EINVAL);
722
723 if (flags & DRR_FLAG_CI_DATA)
724 rbsa.dsflags = DS_FLAG_CI_DATASET;
725
726 bzero(drc, sizeof (dmu_recv_cookie_t));
727 drc->drc_drrb = drrb;
728 drc->drc_tosnap = tosnap;
729 drc->drc_top_ds = top_ds;
730 drc->drc_force = force;
731
732 /*
733 * Process the begin in syncing context.
734 */
735
736 /* open the dataset we are logically receiving into */
737 err = dsl_dataset_hold(tofs, dmu_recv_tag, &ds);
738 if (err == 0) {
739 if (dmu_recv_verify_features(ds, drrb)) {
740 dsl_dataset_rele(ds, dmu_recv_tag);
741 return (ENOTSUP);
742 }
743 /* target fs already exists; recv into temp clone */
744
745 /* Can't recv a clone into an existing fs */
746 if (flags & DRR_FLAG_CLONE) {
747 dsl_dataset_rele(ds, dmu_recv_tag);
748 return (EINVAL);
749 }
750
751 /* must not have an incremental recv already in progress */
752 if (!mutex_tryenter(&ds->ds_recvlock)) {
753 dsl_dataset_rele(ds, dmu_recv_tag);
754 return (EBUSY);
755 }
756
757 /* tmp clone name is: tofs/%tosnap" */
758 (void) snprintf(rbsa.clonelastname, sizeof (rbsa.clonelastname),
759 "%%%s", tosnap);
760 rbsa.force = force;
761 err = dsl_sync_task_do(ds->ds_dir->dd_pool,
762 recv_existing_check, recv_existing_sync, ds, &rbsa, 5);
763 if (err) {
764 mutex_exit(&ds->ds_recvlock);
765 dsl_dataset_rele(ds, dmu_recv_tag);
766 return (err);
767 }
768 drc->drc_logical_ds = ds;
769 drc->drc_real_ds = rbsa.ds;
770 } else if (err == ENOENT) {
771 /* target fs does not exist; must be a full backup or clone */
772 char *cp;
773
774 /*
775 * If it's a non-clone incremental, we are missing the
776 * target fs, so fail the recv.
777 */
778 if (rbsa.fromguid && !(flags & DRR_FLAG_CLONE))
779 return (ENOENT);
780
781 /* Open the parent of tofs */
782 cp = strrchr(tofs, '/');
783 *cp = '\0';
784 err = dsl_dataset_hold(tofs, FTAG, &ds);
785 *cp = '/';
786 if (err)
787 return (err);
788
789 if (dmu_recv_verify_features(ds, drrb)) {
790 dsl_dataset_rele(ds, FTAG);
791 return (ENOTSUP);
792 }
793
794 err = dsl_sync_task_do(ds->ds_dir->dd_pool,
795 recv_new_check, recv_new_sync, ds->ds_dir, &rbsa, 5);
796 dsl_dataset_rele(ds, FTAG);
797 if (err)
798 return (err);
799 drc->drc_logical_ds = drc->drc_real_ds = rbsa.ds;
800 drc->drc_newfs = B_TRUE;
801 }
802
803 return (err);
804 }
805
806 struct restorearg {
807 int err;
808 int byteswap;
809 vnode_t *vp;
810 char *buf;
811 uint64_t voff;
812 int bufsize; /* amount of memory allocated for buf */
813 zio_cksum_t cksum;
814 avl_tree_t *guid_to_ds_map;
815 };
816
817 typedef struct guid_map_entry {
818 uint64_t guid;
819 dsl_dataset_t *gme_ds;
820 avl_node_t avlnode;
821 } guid_map_entry_t;
822
823 static int
824 guid_compare(const void *arg1, const void *arg2)
825 {
826 const guid_map_entry_t *gmep1 = arg1;
827 const guid_map_entry_t *gmep2 = arg2;
828
829 if (gmep1->guid < gmep2->guid)
830 return (-1);
831 else if (gmep1->guid > gmep2->guid)
832 return (1);
833 return (0);
834 }
835
836 /*
837 * This function is a callback used by dmu_objset_find() (which
838 * enumerates the object sets) to build an avl tree that maps guids
839 * to datasets. The resulting table is used when processing DRR_WRITE_BYREF
840 * send stream records. These records, which are used in dedup'ed
841 * streams, do not contain data themselves, but refer to a copy
842 * of the data block that has already been written because it was
843 * earlier in the stream. That previous copy is identified by the
844 * guid of the dataset with the referenced data.
845 */
846 int
847 find_ds_by_guid(const char *name, void *arg)
848 {
849 avl_tree_t *guid_map = arg;
850 dsl_dataset_t *ds, *snapds;
851 guid_map_entry_t *gmep;
852 dsl_pool_t *dp;
853 int err;
854 uint64_t lastobj, firstobj;
855
856 if (dsl_dataset_hold(name, FTAG, &ds) != 0)
857 return (0);
858
859 dp = ds->ds_dir->dd_pool;
860 rw_enter(&dp->dp_config_rwlock, RW_READER);
861 firstobj = ds->ds_dir->dd_phys->dd_origin_obj;
862 lastobj = ds->ds_phys->ds_prev_snap_obj;
863
864 while (lastobj != firstobj) {
865 err = dsl_dataset_hold_obj(dp, lastobj, guid_map, &snapds);
866 if (err) {
867 /*
868 * Skip this snapshot and move on. It's not
869 * clear why this would ever happen, but the
870 * remainder of the snapshot streadm can be
871 * processed.
872 */
873 rw_exit(&dp->dp_config_rwlock);
874 dsl_dataset_rele(ds, FTAG);
875 return (0);
876 }
877
878 gmep = kmem_alloc(sizeof (guid_map_entry_t), KM_SLEEP);
879 gmep->guid = snapds->ds_phys->ds_guid;
880 gmep->gme_ds = snapds;
881 avl_add(guid_map, gmep);
882 lastobj = snapds->ds_phys->ds_prev_snap_obj;
883 }
884
885 rw_exit(&dp->dp_config_rwlock);
886 dsl_dataset_rele(ds, FTAG);
887
888 return (0);
889 }
890
891 static void
892 free_guid_map_onexit(void *arg)
893 {
894 avl_tree_t *ca = arg;
895 void *cookie = NULL;
896 guid_map_entry_t *gmep;
897
898 while ((gmep = avl_destroy_nodes(ca, &cookie)) != NULL) {
899 dsl_dataset_rele(gmep->gme_ds, ca);
900 kmem_free(gmep, sizeof (guid_map_entry_t));
901 }
902 avl_destroy(ca);
903 kmem_free(ca, sizeof (avl_tree_t));
904 }
905
906 static void *
907 restore_read(struct restorearg *ra, int len)
908 {
909 void *rv;
910 int done = 0;
911
912 /* some things will require 8-byte alignment, so everything must */
913 ASSERT3U(len % 8, ==, 0);
914
915 while (done < len) {
916 ssize_t resid;
917
918 ra->err = vn_rdwr(UIO_READ, ra->vp,
919 (caddr_t)ra->buf + done, len - done,
920 ra->voff, UIO_SYSSPACE, FAPPEND,
921 RLIM64_INFINITY, CRED(), &resid);
922
923 if (resid == len - done)
924 ra->err = EINVAL;
925 ra->voff += len - done - resid;
926 done = len - resid;
927 if (ra->err)
928 return (NULL);
929 }
930
931 ASSERT3U(done, ==, len);
932 rv = ra->buf;
933 if (ra->byteswap)
934 fletcher_4_incremental_byteswap(rv, len, &ra->cksum);
935 else
936 fletcher_4_incremental_native(rv, len, &ra->cksum);
937 return (rv);
938 }
939
940 static void
941 backup_byteswap(dmu_replay_record_t *drr)
942 {
943 #define DO64(X) (drr->drr_u.X = BSWAP_64(drr->drr_u.X))
944 #define DO32(X) (drr->drr_u.X = BSWAP_32(drr->drr_u.X))
945 drr->drr_type = BSWAP_32(drr->drr_type);
946 drr->drr_payloadlen = BSWAP_32(drr->drr_payloadlen);
947 switch (drr->drr_type) {
948 case DRR_BEGIN:
949 DO64(drr_begin.drr_magic);
950 DO64(drr_begin.drr_versioninfo);
951 DO64(drr_begin.drr_creation_time);
952 DO32(drr_begin.drr_type);
953 DO32(drr_begin.drr_flags);
954 DO64(drr_begin.drr_toguid);
955 DO64(drr_begin.drr_fromguid);
956 break;
957 case DRR_OBJECT:
958 DO64(drr_object.drr_object);
959 /* DO64(drr_object.drr_allocation_txg); */
960 DO32(drr_object.drr_type);
961 DO32(drr_object.drr_bonustype);
962 DO32(drr_object.drr_blksz);
963 DO32(drr_object.drr_bonuslen);
964 DO64(drr_object.drr_toguid);
965 break;
966 case DRR_FREEOBJECTS:
967 DO64(drr_freeobjects.drr_firstobj);
968 DO64(drr_freeobjects.drr_numobjs);
969 DO64(drr_freeobjects.drr_toguid);
970 break;
971 case DRR_WRITE:
972 DO64(drr_write.drr_object);
973 DO32(drr_write.drr_type);
974 DO64(drr_write.drr_offset);
975 DO64(drr_write.drr_length);
976 DO64(drr_write.drr_toguid);
977 DO64(drr_write.drr_key.ddk_cksum.zc_word[0]);
978 DO64(drr_write.drr_key.ddk_cksum.zc_word[1]);
979 DO64(drr_write.drr_key.ddk_cksum.zc_word[2]);
980 DO64(drr_write.drr_key.ddk_cksum.zc_word[3]);
981 DO64(drr_write.drr_key.ddk_prop);
982 break;
983 case DRR_WRITE_BYREF:
984 DO64(drr_write_byref.drr_object);
985 DO64(drr_write_byref.drr_offset);
986 DO64(drr_write_byref.drr_length);
987 DO64(drr_write_byref.drr_toguid);
988 DO64(drr_write_byref.drr_refguid);
989 DO64(drr_write_byref.drr_refobject);
990 DO64(drr_write_byref.drr_refoffset);
991 DO64(drr_write_byref.drr_key.ddk_cksum.zc_word[0]);
992 DO64(drr_write_byref.drr_key.ddk_cksum.zc_word[1]);
993 DO64(drr_write_byref.drr_key.ddk_cksum.zc_word[2]);
994 DO64(drr_write_byref.drr_key.ddk_cksum.zc_word[3]);
995 DO64(drr_write_byref.drr_key.ddk_prop);
996 break;
997 case DRR_FREE:
998 DO64(drr_free.drr_object);
999 DO64(drr_free.drr_offset);
1000 DO64(drr_free.drr_length);
1001 DO64(drr_free.drr_toguid);
1002 break;
1003 case DRR_SPILL:
1004 DO64(drr_spill.drr_object);
1005 DO64(drr_spill.drr_length);
1006 DO64(drr_spill.drr_toguid);
1007 break;
1008 case DRR_END:
1009 DO64(drr_end.drr_checksum.zc_word[0]);
1010 DO64(drr_end.drr_checksum.zc_word[1]);
1011 DO64(drr_end.drr_checksum.zc_word[2]);
1012 DO64(drr_end.drr_checksum.zc_word[3]);
1013 DO64(drr_end.drr_toguid);
1014 break;
1015 }
1016 #undef DO64
1017 #undef DO32
1018 }
1019
1020 static int
1021 restore_object(struct restorearg *ra, objset_t *os, struct drr_object *drro)
1022 {
1023 int err;
1024 dmu_tx_t *tx;
1025 void *data = NULL;
1026
1027 if (drro->drr_type == DMU_OT_NONE ||
1028 drro->drr_type >= DMU_OT_NUMTYPES ||
1029 drro->drr_bonustype >= DMU_OT_NUMTYPES ||
1030 drro->drr_checksumtype >= ZIO_CHECKSUM_FUNCTIONS ||
1031 drro->drr_compress >= ZIO_COMPRESS_FUNCTIONS ||
1032 P2PHASE(drro->drr_blksz, SPA_MINBLOCKSIZE) ||
1033 drro->drr_blksz < SPA_MINBLOCKSIZE ||
1034 drro->drr_blksz > SPA_MAXBLOCKSIZE ||
1035 drro->drr_bonuslen > DN_MAX_BONUSLEN) {
1036 return (EINVAL);
1037 }
1038
1039 err = dmu_object_info(os, drro->drr_object, NULL);
1040
1041 if (err != 0 && err != ENOENT)
1042 return (EINVAL);
1043
1044 if (drro->drr_bonuslen) {
1045 data = restore_read(ra, P2ROUNDUP(drro->drr_bonuslen, 8));
1046 if (ra->err)
1047 return (ra->err);
1048 }
1049
1050 if (err == ENOENT) {
1051 /* currently free, want to be allocated */
1052 tx = dmu_tx_create(os);
1053 dmu_tx_hold_bonus(tx, DMU_NEW_OBJECT);
1054 err = dmu_tx_assign(tx, TXG_WAIT);
1055 if (err) {
1056 dmu_tx_abort(tx);
1057 return (err);
1058 }
1059 err = dmu_object_claim(os, drro->drr_object,
1060 drro->drr_type, drro->drr_blksz,
1061 drro->drr_bonustype, drro->drr_bonuslen, tx);
1062 dmu_tx_commit(tx);
1063 } else {
1064 /* currently allocated, want to be allocated */
1065 err = dmu_object_reclaim(os, drro->drr_object,
1066 drro->drr_type, drro->drr_blksz,
1067 drro->drr_bonustype, drro->drr_bonuslen);
1068 }
1069 if (err) {
1070 return (EINVAL);
1071 }
1072
1073 tx = dmu_tx_create(os);
1074 dmu_tx_hold_bonus(tx, drro->drr_object);
1075 err = dmu_tx_assign(tx, TXG_WAIT);
1076 if (err) {
1077 dmu_tx_abort(tx);
1078 return (err);
1079 }
1080
1081 dmu_object_set_checksum(os, drro->drr_object, drro->drr_checksumtype,
1082 tx);
1083 dmu_object_set_compress(os, drro->drr_object, drro->drr_compress, tx);
1084
1085 if (data != NULL) {
1086 dmu_buf_t *db;
1087
1088 VERIFY(0 == dmu_bonus_hold(os, drro->drr_object, FTAG, &db));
1089 dmu_buf_will_dirty(db, tx);
1090
1091 ASSERT3U(db->db_size, >=, drro->drr_bonuslen);
1092 bcopy(data, db->db_data, drro->drr_bonuslen);
1093 if (ra->byteswap) {
1094 dmu_ot[drro->drr_bonustype].ot_byteswap(db->db_data,
1095 drro->drr_bonuslen);
1096 }
1097 dmu_buf_rele(db, FTAG);
1098 }
1099 dmu_tx_commit(tx);
1100 return (0);
1101 }
1102
1103 /* ARGSUSED */
1104 static int
1105 restore_freeobjects(struct restorearg *ra, objset_t *os,
1106 struct drr_freeobjects *drrfo)
1107 {
1108 uint64_t obj;
1109
1110 if (drrfo->drr_firstobj + drrfo->drr_numobjs < drrfo->drr_firstobj)
1111 return (EINVAL);
1112
1113 for (obj = drrfo->drr_firstobj;
1114 obj < drrfo->drr_firstobj + drrfo->drr_numobjs;
1115 (void) dmu_object_next(os, &obj, FALSE, 0)) {
1116 int err;
1117
1118 if (dmu_object_info(os, obj, NULL) != 0)
1119 continue;
1120
1121 err = dmu_free_object(os, obj);
1122 if (err)
1123 return (err);
1124 }
1125 return (0);
1126 }
1127
1128 static int
1129 restore_write(struct restorearg *ra, objset_t *os,
1130 struct drr_write *drrw)
1131 {
1132 dmu_tx_t *tx;
1133 void *data;
1134 int err;
1135
1136 if (drrw->drr_offset + drrw->drr_length < drrw->drr_offset ||
1137 drrw->drr_type >= DMU_OT_NUMTYPES)
1138 return (EINVAL);
1139
1140 data = restore_read(ra, drrw->drr_length);
1141 if (data == NULL)
1142 return (ra->err);
1143
1144 if (dmu_object_info(os, drrw->drr_object, NULL) != 0)
1145 return (EINVAL);
1146
1147 tx = dmu_tx_create(os);
1148
1149 dmu_tx_hold_write(tx, drrw->drr_object,
1150 drrw->drr_offset, drrw->drr_length);
1151 err = dmu_tx_assign(tx, TXG_WAIT);
1152 if (err) {
1153 dmu_tx_abort(tx);
1154 return (err);
1155 }
1156 if (ra->byteswap)
1157 dmu_ot[drrw->drr_type].ot_byteswap(data, drrw->drr_length);
1158 dmu_write(os, drrw->drr_object,
1159 drrw->drr_offset, drrw->drr_length, data, tx);
1160 dmu_tx_commit(tx);
1161 return (0);
1162 }
1163
1164 /*
1165 * Handle a DRR_WRITE_BYREF record. This record is used in dedup'ed
1166 * streams to refer to a copy of the data that is already on the
1167 * system because it came in earlier in the stream. This function
1168 * finds the earlier copy of the data, and uses that copy instead of
1169 * data from the stream to fulfill this write.
1170 */
1171 static int
1172 restore_write_byref(struct restorearg *ra, objset_t *os,
1173 struct drr_write_byref *drrwbr)
1174 {
1175 dmu_tx_t *tx;
1176 int err;
1177 guid_map_entry_t gmesrch;
1178 guid_map_entry_t *gmep;
1179 avl_index_t where;
1180 objset_t *ref_os = NULL;
1181 dmu_buf_t *dbp;
1182
1183 if (drrwbr->drr_offset + drrwbr->drr_length < drrwbr->drr_offset)
1184 return (EINVAL);
1185
1186 /*
1187 * If the GUID of the referenced dataset is different from the
1188 * GUID of the target dataset, find the referenced dataset.
1189 */
1190 if (drrwbr->drr_toguid != drrwbr->drr_refguid) {
1191 gmesrch.guid = drrwbr->drr_refguid;
1192 if ((gmep = avl_find(ra->guid_to_ds_map, &gmesrch,
1193 &where)) == NULL) {
1194 return (EINVAL);
1195 }
1196 if (dmu_objset_from_ds(gmep->gme_ds, &ref_os))
1197 return (EINVAL);
1198 } else {
1199 ref_os = os;
1200 }
1201
1202 if (err = dmu_buf_hold(ref_os, drrwbr->drr_refobject,
1203 drrwbr->drr_refoffset, FTAG, &dbp, DMU_READ_PREFETCH))
1204 return (err);
1205
1206 tx = dmu_tx_create(os);
1207
1208 dmu_tx_hold_write(tx, drrwbr->drr_object,
1209 drrwbr->drr_offset, drrwbr->drr_length);
1210 err = dmu_tx_assign(tx, TXG_WAIT);
1211 if (err) {
1212 dmu_tx_abort(tx);
1213 return (err);
1214 }
1215 dmu_write(os, drrwbr->drr_object,
1216 drrwbr->drr_offset, drrwbr->drr_length, dbp->db_data, tx);
1217 dmu_buf_rele(dbp, FTAG);
1218 dmu_tx_commit(tx);
1219 return (0);
1220 }
1221
1222 static int
1223 restore_spill(struct restorearg *ra, objset_t *os, struct drr_spill *drrs)
1224 {
1225 dmu_tx_t *tx;
1226 void *data;
1227 dmu_buf_t *db, *db_spill;
1228 int err;
1229
1230 if (drrs->drr_length < SPA_MINBLOCKSIZE ||
1231 drrs->drr_length > SPA_MAXBLOCKSIZE)
1232 return (EINVAL);
1233
1234 data = restore_read(ra, drrs->drr_length);
1235 if (data == NULL)
1236 return (ra->err);
1237
1238 if (dmu_object_info(os, drrs->drr_object, NULL) != 0)
1239 return (EINVAL);
1240
1241 VERIFY(0 == dmu_bonus_hold(os, drrs->drr_object, FTAG, &db));
1242 if ((err = dmu_spill_hold_by_bonus(db, FTAG, &db_spill)) != 0) {
1243 dmu_buf_rele(db, FTAG);
1244 return (err);
1245 }
1246
1247 tx = dmu_tx_create(os);
1248
1249 dmu_tx_hold_spill(tx, db->db_object);
1250
1251 err = dmu_tx_assign(tx, TXG_WAIT);
1252 if (err) {
1253 dmu_buf_rele(db, FTAG);
1254 dmu_buf_rele(db_spill, FTAG);
1255 dmu_tx_abort(tx);
1256 return (err);
1257 }
1258 dmu_buf_will_dirty(db_spill, tx);
1259
1260 if (db_spill->db_size < drrs->drr_length)
1261 VERIFY(0 == dbuf_spill_set_blksz(db_spill,
1262 drrs->drr_length, tx));
1263 bcopy(data, db_spill->db_data, drrs->drr_length);
1264
1265 dmu_buf_rele(db, FTAG);
1266 dmu_buf_rele(db_spill, FTAG);
1267
1268 dmu_tx_commit(tx);
1269 return (0);
1270 }
1271
1272 /* ARGSUSED */
1273 static int
1274 restore_free(struct restorearg *ra, objset_t *os,
1275 struct drr_free *drrf)
1276 {
1277 int err;
1278
1279 if (drrf->drr_length != -1ULL &&
1280 drrf->drr_offset + drrf->drr_length < drrf->drr_offset)
1281 return (EINVAL);
1282
1283 if (dmu_object_info(os, drrf->drr_object, NULL) != 0)
1284 return (EINVAL);
1285
1286 err = dmu_free_long_range(os, drrf->drr_object,
1287 drrf->drr_offset, drrf->drr_length);
1288 return (err);
1289 }
1290
1291 /*
1292 * NB: callers *must* call dmu_recv_end() if this succeeds.
1293 */
1294 int
1295 dmu_recv_stream(dmu_recv_cookie_t *drc, vnode_t *vp, offset_t *voffp,
1296 int cleanup_fd, uint64_t *action_handlep)
1297 {
1298 struct restorearg ra = { 0 };
1299 dmu_replay_record_t *drr;
1300 objset_t *os;
1301 zio_cksum_t pcksum;
1302 int featureflags;
1303
1304 if (drc->drc_drrb->drr_magic == BSWAP_64(DMU_BACKUP_MAGIC))
1305 ra.byteswap = TRUE;
1306
1307 {
1308 /* compute checksum of drr_begin record */
1309 dmu_replay_record_t *drr;
1310 drr = kmem_zalloc(sizeof (dmu_replay_record_t), KM_SLEEP);
1311
1312 drr->drr_type = DRR_BEGIN;
1313 drr->drr_u.drr_begin = *drc->drc_drrb;
1314 if (ra.byteswap) {
1315 fletcher_4_incremental_byteswap(drr,
1316 sizeof (dmu_replay_record_t), &ra.cksum);
1317 } else {
1318 fletcher_4_incremental_native(drr,
1319 sizeof (dmu_replay_record_t), &ra.cksum);
1320 }
1321 kmem_free(drr, sizeof (dmu_replay_record_t));
1322 }
1323
1324 if (ra.byteswap) {
1325 struct drr_begin *drrb = drc->drc_drrb;
1326 drrb->drr_magic = BSWAP_64(drrb->drr_magic);
1327 drrb->drr_versioninfo = BSWAP_64(drrb->drr_versioninfo);
1328 drrb->drr_creation_time = BSWAP_64(drrb->drr_creation_time);
1329 drrb->drr_type = BSWAP_32(drrb->drr_type);
1330 drrb->drr_toguid = BSWAP_64(drrb->drr_toguid);
1331 drrb->drr_fromguid = BSWAP_64(drrb->drr_fromguid);
1332 }
1333
1334 ra.vp = vp;
1335 ra.voff = *voffp;
1336 ra.bufsize = 1<<20;
1337 ra.buf = kmem_alloc(ra.bufsize, KM_SLEEP);
1338
1339 /* these were verified in dmu_recv_begin */
1340 ASSERT(DMU_GET_STREAM_HDRTYPE(drc->drc_drrb->drr_versioninfo) ==
1341 DMU_SUBSTREAM);
1342 ASSERT(drc->drc_drrb->drr_type < DMU_OST_NUMTYPES);
1343
1344 /*
1345 * Open the objset we are modifying.
1346 */
1347 VERIFY(dmu_objset_from_ds(drc->drc_real_ds, &os) == 0);
1348
1349 ASSERT(drc->drc_real_ds->ds_phys->ds_flags & DS_FLAG_INCONSISTENT);
1350
1351 featureflags = DMU_GET_FEATUREFLAGS(drc->drc_drrb->drr_versioninfo);
1352
1353 /* if this stream is dedup'ed, set up the avl tree for guid mapping */
1354 if (featureflags & DMU_BACKUP_FEATURE_DEDUP) {
1355 minor_t minor;
1356
1357 if (cleanup_fd == -1) {
1358 ra.err = EBADF;
1359 goto out;
1360 }
1361 ra.err = zfs_onexit_fd_hold(cleanup_fd, &minor);
1362 if (ra.err) {
1363 cleanup_fd = -1;
1364 goto out;
1365 }
1366
1367 if (*action_handlep == 0) {
1368 ra.guid_to_ds_map =
1369 kmem_alloc(sizeof (avl_tree_t), KM_SLEEP);
1370 avl_create(ra.guid_to_ds_map, guid_compare,
1371 sizeof (guid_map_entry_t),
1372 offsetof(guid_map_entry_t, avlnode));
1373 (void) dmu_objset_find(drc->drc_top_ds, find_ds_by_guid,
1374 (void *)ra.guid_to_ds_map,
1375 DS_FIND_CHILDREN);
1376 ra.err = zfs_onexit_add_cb(minor,
1377 free_guid_map_onexit, ra.guid_to_ds_map,
1378 action_handlep);
1379 if (ra.err)
1380 goto out;
1381 } else {
1382 ra.err = zfs_onexit_cb_data(minor, *action_handlep,
1383 (void **)&ra.guid_to_ds_map);
1384 if (ra.err)
1385 goto out;
1386 }
1387 }
1388
1389 /*
1390 * Read records and process them.
1391 */
1392 pcksum = ra.cksum;
1393 while (ra.err == 0 &&
1394 NULL != (drr = restore_read(&ra, sizeof (*drr)))) {
1395 if (issig(JUSTLOOKING) && issig(FORREAL)) {
1396 ra.err = EINTR;
1397 goto out;
1398 }
1399
1400 if (ra.byteswap)
1401 backup_byteswap(drr);
1402
1403 switch (drr->drr_type) {
1404 case DRR_OBJECT:
1405 {
1406 /*
1407 * We need to make a copy of the record header,
1408 * because restore_{object,write} may need to
1409 * restore_read(), which will invalidate drr.
1410 */
1411 struct drr_object drro = drr->drr_u.drr_object;
1412 ra.err = restore_object(&ra, os, &drro);
1413 break;
1414 }
1415 case DRR_FREEOBJECTS:
1416 {
1417 struct drr_freeobjects drrfo =
1418 drr->drr_u.drr_freeobjects;
1419 ra.err = restore_freeobjects(&ra, os, &drrfo);
1420 break;
1421 }
1422 case DRR_WRITE:
1423 {
1424 struct drr_write drrw = drr->drr_u.drr_write;
1425 ra.err = restore_write(&ra, os, &drrw);
1426 break;
1427 }
1428 case DRR_WRITE_BYREF:
1429 {
1430 struct drr_write_byref drrwbr =
1431 drr->drr_u.drr_write_byref;
1432 ra.err = restore_write_byref(&ra, os, &drrwbr);
1433 break;
1434 }
1435 case DRR_FREE:
1436 {
1437 struct drr_free drrf = drr->drr_u.drr_free;
1438 ra.err = restore_free(&ra, os, &drrf);
1439 break;
1440 }
1441 case DRR_END:
1442 {
1443 struct drr_end drre = drr->drr_u.drr_end;
1444 /*
1445 * We compare against the *previous* checksum
1446 * value, because the stored checksum is of
1447 * everything before the DRR_END record.
1448 */
1449 if (!ZIO_CHECKSUM_EQUAL(drre.drr_checksum, pcksum))
1450 ra.err = ECKSUM;
1451 goto out;
1452 }
1453 case DRR_SPILL:
1454 {
1455 struct drr_spill drrs = drr->drr_u.drr_spill;
1456 ra.err = restore_spill(&ra, os, &drrs);
1457 break;
1458 }
1459 default:
1460 ra.err = EINVAL;
1461 goto out;
1462 }
1463 pcksum = ra.cksum;
1464 }
1465 ASSERT(ra.err != 0);
1466
1467 out:
1468 if ((featureflags & DMU_BACKUP_FEATURE_DEDUP) && (cleanup_fd != -1))
1469 zfs_onexit_fd_rele(cleanup_fd);
1470
1471 if (ra.err != 0) {
1472 /*
1473 * destroy what we created, so we don't leave it in the
1474 * inconsistent restoring state.
1475 */
1476 txg_wait_synced(drc->drc_real_ds->ds_dir->dd_pool, 0);
1477
1478 (void) dsl_dataset_destroy(drc->drc_real_ds, dmu_recv_tag,
1479 B_FALSE);
1480 if (drc->drc_real_ds != drc->drc_logical_ds) {
1481 mutex_exit(&drc->drc_logical_ds->ds_recvlock);
1482 dsl_dataset_rele(drc->drc_logical_ds, dmu_recv_tag);
1483 }
1484 }
1485
1486 kmem_free(ra.buf, ra.bufsize);
1487 *voffp = ra.voff;
1488 return (ra.err);
1489 }
1490
1491 struct recvendsyncarg {
1492 char *tosnap;
1493 uint64_t creation_time;
1494 uint64_t toguid;
1495 };
1496
1497 static int
1498 recv_end_check(void *arg1, void *arg2, dmu_tx_t *tx)
1499 {
1500 dsl_dataset_t *ds = arg1;
1501 struct recvendsyncarg *resa = arg2;
1502
1503 return (dsl_dataset_snapshot_check(ds, resa->tosnap, tx));
1504 }
1505
1506 static void
1507 recv_end_sync(void *arg1, void *arg2, dmu_tx_t *tx)
1508 {
1509 dsl_dataset_t *ds = arg1;
1510 struct recvendsyncarg *resa = arg2;
1511
1512 dsl_dataset_snapshot_sync(ds, resa->tosnap, tx);
1513
1514 /* set snapshot's creation time and guid */
1515 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx);
1516 ds->ds_prev->ds_phys->ds_creation_time = resa->creation_time;
1517 ds->ds_prev->ds_phys->ds_guid = resa->toguid;
1518 ds->ds_prev->ds_phys->ds_flags &= ~DS_FLAG_INCONSISTENT;
1519
1520 dmu_buf_will_dirty(ds->ds_dbuf, tx);
1521 ds->ds_phys->ds_flags &= ~DS_FLAG_INCONSISTENT;
1522 }
1523
1524 static int
1525 dmu_recv_existing_end(dmu_recv_cookie_t *drc)
1526 {
1527 struct recvendsyncarg resa;
1528 dsl_dataset_t *ds = drc->drc_logical_ds;
1529 int err;
1530
1531 /*
1532 * XXX hack; seems the ds is still dirty and dsl_pool_zil_clean()
1533 * expects it to have a ds_user_ptr (and zil), but clone_swap()
1534 * can close it.
1535 */
1536 txg_wait_synced(ds->ds_dir->dd_pool, 0);
1537
1538 if (dsl_dataset_tryown(ds, FALSE, dmu_recv_tag)) {
1539 err = dsl_dataset_clone_swap(drc->drc_real_ds, ds,
1540 drc->drc_force);
1541 if (err)
1542 goto out;
1543 } else {
1544 mutex_exit(&ds->ds_recvlock);
1545 dsl_dataset_rele(ds, dmu_recv_tag);
1546 (void) dsl_dataset_destroy(drc->drc_real_ds, dmu_recv_tag,
1547 B_FALSE);
1548 return (EBUSY);
1549 }
1550
1551 resa.creation_time = drc->drc_drrb->drr_creation_time;
1552 resa.toguid = drc->drc_drrb->drr_toguid;
1553 resa.tosnap = drc->drc_tosnap;
1554
1555 err = dsl_sync_task_do(ds->ds_dir->dd_pool,
1556 recv_end_check, recv_end_sync, ds, &resa, 3);
1557 if (err) {
1558 /* swap back */
1559 (void) dsl_dataset_clone_swap(drc->drc_real_ds, ds, B_TRUE);
1560 }
1561
1562 out:
1563 mutex_exit(&ds->ds_recvlock);
1564 dsl_dataset_disown(ds, dmu_recv_tag);
1565 (void) dsl_dataset_destroy(drc->drc_real_ds, dmu_recv_tag, B_FALSE);
1566 return (err);
1567 }
1568
1569 static int
1570 dmu_recv_new_end(dmu_recv_cookie_t *drc)
1571 {
1572 struct recvendsyncarg resa;
1573 dsl_dataset_t *ds = drc->drc_logical_ds;
1574 int err;
1575
1576 /*
1577 * XXX hack; seems the ds is still dirty and dsl_pool_zil_clean()
1578 * expects it to have a ds_user_ptr (and zil), but clone_swap()
1579 * can close it.
1580 */
1581 txg_wait_synced(ds->ds_dir->dd_pool, 0);
1582
1583 resa.creation_time = drc->drc_drrb->drr_creation_time;
1584 resa.toguid = drc->drc_drrb->drr_toguid;
1585 resa.tosnap = drc->drc_tosnap;
1586
1587 err = dsl_sync_task_do(ds->ds_dir->dd_pool,
1588 recv_end_check, recv_end_sync, ds, &resa, 3);
1589 if (err) {
1590 /* clean up the fs we just recv'd into */
1591 (void) dsl_dataset_destroy(ds, dmu_recv_tag, B_FALSE);
1592 } else {
1593 /* release the hold from dmu_recv_begin */
1594 dsl_dataset_disown(ds, dmu_recv_tag);
1595 }
1596 return (err);
1597 }
1598
1599 int
1600 dmu_recv_end(dmu_recv_cookie_t *drc)
1601 {
1602 if (drc->drc_logical_ds != drc->drc_real_ds)
1603 return (dmu_recv_existing_end(drc));
1604 else
1605 return (dmu_recv_new_end(drc));
1606 }
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