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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 * Copyright (c) 2011 by Delphix. All rights reserved.
24 * Copyright 2011 Nexenta Systems, Inc. All rights reserved.
25 * Copyright (c) 2012, Joyent, Inc. All rights reserved.
26 * Copyright (c) 2013 by Delphix. All rights reserved.
27 */
28
29 #include <sys/dmu.h>
30 #include <sys/dmu_impl.h>
31 #include <sys/dmu_tx.h>
32 #include <sys/dbuf.h>
33 #include <sys/dnode.h>
34 #include <sys/zfs_context.h>
35 #include <sys/dmu_objset.h>
36 #include <sys/dmu_traverse.h>
37 #include <sys/dsl_dataset.h>
38 #include <sys/dsl_dir.h>
39 #include <sys/dsl_prop.h>
40 #include <sys/dsl_pool.h>
41 #include <sys/dsl_synctask.h>
42 #include <sys/spa_impl.h>
43 #include <sys/zfs_ioctl.h>
44 #include <sys/zap.h>
45 #include <sys/zio_checksum.h>
46 #include <sys/zfs_znode.h>
47 #include <zfs_fletcher.h>
48 #include <sys/avl.h>
49 #include <sys/ddt.h>
50 #include <sys/zfs_onexit.h>
51 #include <sys/dmu_send.h>
52 #include <sys/dsl_destroy.h>
53 #include <sys/dsl_bookmark.h>
54
55 /* Set this tunable to TRUE to replace corrupt data with 0x2f5baddb10c */
56 int zfs_send_corrupt_data = B_FALSE;
57
58 static char *dmu_recv_tag = "dmu_recv_tag";
59 static const char *recv_clone_name = "%recv";
60
61 typedef struct dump_bytes_io {
62 dmu_sendarg_t *dbi_dsp;
63 void *dbi_buf;
64 int dbi_len;
65 } dump_bytes_io_t;
66
67 static void
68 dump_bytes_strategy(void *arg)
69 {
70 dump_bytes_io_t *dbi = (dump_bytes_io_t *)arg;
71 dmu_sendarg_t *dsp = dbi->dbi_dsp;
72 dsl_dataset_t *ds = dsp->dsa_os->os_dsl_dataset;
73 ssize_t resid; /* have to get resid to get detailed errno */
74 ASSERT0(dbi->dbi_len % 8);
75
76 fletcher_4_incremental_native(dbi->dbi_buf, dbi->dbi_len, &dsp->dsa_zc);
77 dsp->dsa_err = vn_rdwr(UIO_WRITE, dsp->dsa_vp,
78 (caddr_t)dbi->dbi_buf, dbi->dbi_len,
79 0, UIO_SYSSPACE, FAPPEND, RLIM64_INFINITY, CRED(), &resid);
80
81 mutex_enter(&ds->ds_sendstream_lock);
82 *dsp->dsa_off += dbi->dbi_len;
83 mutex_exit(&ds->ds_sendstream_lock);
84 }
85
86 static int
87 dump_bytes(dmu_sendarg_t *dsp, void *buf, int len)
88 {
89 dump_bytes_io_t dbi;
90
91 dbi.dbi_dsp = dsp;
92 dbi.dbi_buf = buf;
93 dbi.dbi_len = len;
94
95 /*
96 * The vn_rdwr() call is performed in a taskq to ensure that there is
97 * always enough stack space to write safely to the target filesystem.
98 * The ZIO_TYPE_FREE threads are used because there can be a lot of
99 * them and they are used in vdev_file.c for a similar purpose.
100 */
101 spa_taskq_dispatch_sync(dmu_objset_spa(dsp->dsa_os), ZIO_TYPE_FREE,
102 ZIO_TASKQ_ISSUE, dump_bytes_strategy, &dbi, TQ_SLEEP);
103
104 return (dsp->dsa_err);
105 }
106
107 static int
108 dump_free(dmu_sendarg_t *dsp, uint64_t object, uint64_t offset,
109 uint64_t length)
110 {
111 struct drr_free *drrf = &(dsp->dsa_drr->drr_u.drr_free);
112
113 /*
114 * When we receive a free record, dbuf_free_range() assumes
115 * that the receiving system doesn't have any dbufs in the range
116 * being freed. This is always true because there is a one-record
117 * constraint: we only send one WRITE record for any given
118 * object+offset. We know that the one-record constraint is
119 * true because we always send data in increasing order by
120 * object,offset.
121 *
122 * If the increasing-order constraint ever changes, we should find
123 * another way to assert that the one-record constraint is still
124 * satisfied.
125 */
126 ASSERT(object > dsp->dsa_last_data_object ||
127 (object == dsp->dsa_last_data_object &&
128 offset > dsp->dsa_last_data_offset));
129
130 /*
131 * If we are doing a non-incremental send, then there can't
132 * be any data in the dataset we're receiving into. Therefore
133 * a free record would simply be a no-op. Save space by not
134 * sending it to begin with.
135 */
136 if (!dsp->dsa_incremental)
137 return (0);
138
139 if (length != -1ULL && offset + length < offset)
140 length = -1ULL;
141
142 /*
143 * If there is a pending op, but it's not PENDING_FREE, push it out,
144 * since free block aggregation can only be done for blocks of the
145 * same type (i.e., DRR_FREE records can only be aggregated with
146 * other DRR_FREE records. DRR_FREEOBJECTS records can only be
147 * aggregated with other DRR_FREEOBJECTS records.
148 */
149 if (dsp->dsa_pending_op != PENDING_NONE &&
150 dsp->dsa_pending_op != PENDING_FREE) {
151 if (dump_bytes(dsp, dsp->dsa_drr,
152 sizeof (dmu_replay_record_t)) != 0)
153 return (SET_ERROR(EINTR));
154 dsp->dsa_pending_op = PENDING_NONE;
155 }
156
157 if (dsp->dsa_pending_op == PENDING_FREE) {
158 /*
159 * There should never be a PENDING_FREE if length is -1
160 * (because dump_dnode is the only place where this
161 * function is called with a -1, and only after flushing
162 * any pending record).
163 */
164 ASSERT(length != -1ULL);
165 /*
166 * Check to see whether this free block can be aggregated
167 * with pending one.
168 */
169 if (drrf->drr_object == object && drrf->drr_offset +
170 drrf->drr_length == offset) {
171 drrf->drr_length += length;
172 return (0);
173 } else {
174 /* not a continuation. Push out pending record */
175 if (dump_bytes(dsp, dsp->dsa_drr,
176 sizeof (dmu_replay_record_t)) != 0)
177 return (SET_ERROR(EINTR));
178 dsp->dsa_pending_op = PENDING_NONE;
179 }
180 }
181 /* create a FREE record and make it pending */
182 bzero(dsp->dsa_drr, sizeof (dmu_replay_record_t));
183 dsp->dsa_drr->drr_type = DRR_FREE;
184 drrf->drr_object = object;
185 drrf->drr_offset = offset;
186 drrf->drr_length = length;
187 drrf->drr_toguid = dsp->dsa_toguid;
188 if (length == -1ULL) {
189 if (dump_bytes(dsp, dsp->dsa_drr,
190 sizeof (dmu_replay_record_t)) != 0)
191 return (SET_ERROR(EINTR));
192 } else {
193 dsp->dsa_pending_op = PENDING_FREE;
194 }
195
196 return (0);
197 }
198
199 static int
200 dump_data(dmu_sendarg_t *dsp, dmu_object_type_t type,
201 uint64_t object, uint64_t offset, int blksz, const blkptr_t *bp, void *data)
202 {
203 struct drr_write *drrw = &(dsp->dsa_drr->drr_u.drr_write);
204
205 /*
206 * We send data in increasing object, offset order.
207 * See comment in dump_free() for details.
208 */
209 ASSERT(object > dsp->dsa_last_data_object ||
210 (object == dsp->dsa_last_data_object &&
211 offset > dsp->dsa_last_data_offset));
212 dsp->dsa_last_data_object = object;
213 dsp->dsa_last_data_offset = offset + blksz - 1;
214
215 /*
216 * If there is any kind of pending aggregation (currently either
217 * a grouping of free objects or free blocks), push it out to
218 * the stream, since aggregation can't be done across operations
219 * of different types.
220 */
221 if (dsp->dsa_pending_op != PENDING_NONE) {
222 if (dump_bytes(dsp, dsp->dsa_drr,
223 sizeof (dmu_replay_record_t)) != 0)
224 return (SET_ERROR(EINTR));
225 dsp->dsa_pending_op = PENDING_NONE;
226 }
227 /* write a DATA record */
228 bzero(dsp->dsa_drr, sizeof (dmu_replay_record_t));
229 dsp->dsa_drr->drr_type = DRR_WRITE;
230 drrw->drr_object = object;
231 drrw->drr_type = type;
232 drrw->drr_offset = offset;
233 drrw->drr_length = blksz;
234 drrw->drr_toguid = dsp->dsa_toguid;
235 drrw->drr_checksumtype = BP_GET_CHECKSUM(bp);
236 if (zio_checksum_table[drrw->drr_checksumtype].ci_dedup)
237 drrw->drr_checksumflags |= DRR_CHECKSUM_DEDUP;
238 DDK_SET_LSIZE(&drrw->drr_key, BP_GET_LSIZE(bp));
239 DDK_SET_PSIZE(&drrw->drr_key, BP_GET_PSIZE(bp));
240 DDK_SET_COMPRESS(&drrw->drr_key, BP_GET_COMPRESS(bp));
241 drrw->drr_key.ddk_cksum = bp->blk_cksum;
242
243 if (dump_bytes(dsp, dsp->dsa_drr, sizeof (dmu_replay_record_t)) != 0)
244 return (SET_ERROR(EINTR));
245 if (dump_bytes(dsp, data, blksz) != 0)
246 return (SET_ERROR(EINTR));
247 return (0);
248 }
249
250 static int
251 dump_spill(dmu_sendarg_t *dsp, uint64_t object, int blksz, void *data)
252 {
253 struct drr_spill *drrs = &(dsp->dsa_drr->drr_u.drr_spill);
254
255 if (dsp->dsa_pending_op != PENDING_NONE) {
256 if (dump_bytes(dsp, dsp->dsa_drr,
257 sizeof (dmu_replay_record_t)) != 0)
258 return (SET_ERROR(EINTR));
259 dsp->dsa_pending_op = PENDING_NONE;
260 }
261
262 /* write a SPILL record */
263 bzero(dsp->dsa_drr, sizeof (dmu_replay_record_t));
264 dsp->dsa_drr->drr_type = DRR_SPILL;
265 drrs->drr_object = object;
266 drrs->drr_length = blksz;
267 drrs->drr_toguid = dsp->dsa_toguid;
268
269 if (dump_bytes(dsp, dsp->dsa_drr, sizeof (dmu_replay_record_t)))
270 return (SET_ERROR(EINTR));
271 if (dump_bytes(dsp, data, blksz))
272 return (SET_ERROR(EINTR));
273 return (0);
274 }
275
276 static int
277 dump_freeobjects(dmu_sendarg_t *dsp, uint64_t firstobj, uint64_t numobjs)
278 {
279 struct drr_freeobjects *drrfo = &(dsp->dsa_drr->drr_u.drr_freeobjects);
280
281 /* See comment in dump_free(). */
282 if (!dsp->dsa_incremental)
283 return (0);
284
285 /*
286 * If there is a pending op, but it's not PENDING_FREEOBJECTS,
287 * push it out, since free block aggregation can only be done for
288 * blocks of the same type (i.e., DRR_FREE records can only be
289 * aggregated with other DRR_FREE records. DRR_FREEOBJECTS records
290 * can only be aggregated with other DRR_FREEOBJECTS records.
291 */
292 if (dsp->dsa_pending_op != PENDING_NONE &&
293 dsp->dsa_pending_op != PENDING_FREEOBJECTS) {
294 if (dump_bytes(dsp, dsp->dsa_drr,
295 sizeof (dmu_replay_record_t)) != 0)
296 return (SET_ERROR(EINTR));
297 dsp->dsa_pending_op = PENDING_NONE;
298 }
299 if (dsp->dsa_pending_op == PENDING_FREEOBJECTS) {
300 /*
301 * See whether this free object array can be aggregated
302 * with pending one
303 */
304 if (drrfo->drr_firstobj + drrfo->drr_numobjs == firstobj) {
305 drrfo->drr_numobjs += numobjs;
306 return (0);
307 } else {
308 /* can't be aggregated. Push out pending record */
309 if (dump_bytes(dsp, dsp->dsa_drr,
310 sizeof (dmu_replay_record_t)) != 0)
311 return (SET_ERROR(EINTR));
312 dsp->dsa_pending_op = PENDING_NONE;
313 }
314 }
315
316 /* write a FREEOBJECTS record */
317 bzero(dsp->dsa_drr, sizeof (dmu_replay_record_t));
318 dsp->dsa_drr->drr_type = DRR_FREEOBJECTS;
319 drrfo->drr_firstobj = firstobj;
320 drrfo->drr_numobjs = numobjs;
321 drrfo->drr_toguid = dsp->dsa_toguid;
322
323 dsp->dsa_pending_op = PENDING_FREEOBJECTS;
324
325 return (0);
326 }
327
328 static int
329 dump_dnode(dmu_sendarg_t *dsp, uint64_t object, dnode_phys_t *dnp)
330 {
331 struct drr_object *drro = &(dsp->dsa_drr->drr_u.drr_object);
332
333 if (dnp == NULL || dnp->dn_type == DMU_OT_NONE)
334 return (dump_freeobjects(dsp, object, 1));
335
336 if (dsp->dsa_pending_op != PENDING_NONE) {
337 if (dump_bytes(dsp, dsp->dsa_drr,
338 sizeof (dmu_replay_record_t)) != 0)
339 return (SET_ERROR(EINTR));
340 dsp->dsa_pending_op = PENDING_NONE;
341 }
342
343 /* write an OBJECT record */
344 bzero(dsp->dsa_drr, sizeof (dmu_replay_record_t));
345 dsp->dsa_drr->drr_type = DRR_OBJECT;
346 drro->drr_object = object;
347 drro->drr_type = dnp->dn_type;
348 drro->drr_bonustype = dnp->dn_bonustype;
349 drro->drr_blksz = dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT;
350 drro->drr_bonuslen = dnp->dn_bonuslen;
351 drro->drr_checksumtype = dnp->dn_checksum;
352 drro->drr_compress = dnp->dn_compress;
353 drro->drr_toguid = dsp->dsa_toguid;
354
355 if (dump_bytes(dsp, dsp->dsa_drr, sizeof (dmu_replay_record_t)) != 0)
356 return (SET_ERROR(EINTR));
357
358 if (dump_bytes(dsp, DN_BONUS(dnp), P2ROUNDUP(dnp->dn_bonuslen, 8)) != 0)
359 return (SET_ERROR(EINTR));
360
361 /* Free anything past the end of the file. */
362 if (dump_free(dsp, object, (dnp->dn_maxblkid + 1) *
363 (dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT), -1ULL) != 0)
364 return (SET_ERROR(EINTR));
365 if (dsp->dsa_err != 0)
366 return (SET_ERROR(EINTR));
367 return (0);
368 }
369
370 #define BP_SPAN(dnp, level) \
371 (((uint64_t)dnp->dn_datablkszsec) << (SPA_MINBLOCKSHIFT + \
372 (level) * (dnp->dn_indblkshift - SPA_BLKPTRSHIFT)))
373
374 /* ARGSUSED */
375 static int
376 backup_cb(spa_t *spa, zilog_t *zilog, const blkptr_t *bp,
377 const zbookmark_t *zb, const dnode_phys_t *dnp, void *arg)
378 {
379 dmu_sendarg_t *dsp = arg;
380 dmu_object_type_t type = bp ? BP_GET_TYPE(bp) : DMU_OT_NONE;
381 int err = 0;
382
383 if (issig(JUSTLOOKING) && issig(FORREAL))
384 return (SET_ERROR(EINTR));
385
386 if (zb->zb_object != DMU_META_DNODE_OBJECT &&
387 DMU_OBJECT_IS_SPECIAL(zb->zb_object)) {
388 return (0);
389 } else if (zb->zb_level == ZB_ZIL_LEVEL) {
390 /*
391 * If we are sending a non-snapshot (which is allowed on
392 * read-only pools), it may have a ZIL, which must be ignored.
393 */
394 return (0);
395 } else if (BP_IS_HOLE(bp) &&
396 zb->zb_object == DMU_META_DNODE_OBJECT) {
397 uint64_t span = BP_SPAN(dnp, zb->zb_level);
398 uint64_t dnobj = (zb->zb_blkid * span) >> DNODE_SHIFT;
399 err = dump_freeobjects(dsp, dnobj, span >> DNODE_SHIFT);
400 } else if (BP_IS_HOLE(bp)) {
401 uint64_t span = BP_SPAN(dnp, zb->zb_level);
402 err = dump_free(dsp, zb->zb_object, zb->zb_blkid * span, span);
403 } else if (zb->zb_level > 0 || type == DMU_OT_OBJSET) {
404 return (0);
405 } else if (type == DMU_OT_DNODE) {
406 dnode_phys_t *blk;
407 int i;
408 int blksz = BP_GET_LSIZE(bp);
409 uint32_t aflags = ARC_WAIT;
410 arc_buf_t *abuf;
411
412 if (arc_read(NULL, spa, bp, arc_getbuf_func, &abuf,
413 ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL,
414 &aflags, zb) != 0)
415 return (SET_ERROR(EIO));
416
417 blk = abuf->b_data;
418 for (i = 0; i < blksz >> DNODE_SHIFT; i++) {
419 uint64_t dnobj = (zb->zb_blkid <<
420 (DNODE_BLOCK_SHIFT - DNODE_SHIFT)) + i;
421 err = dump_dnode(dsp, dnobj, blk+i);
422 if (err != 0)
423 break;
424 }
425 (void) arc_buf_remove_ref(abuf, &abuf);
426 } else if (type == DMU_OT_SA) {
427 uint32_t aflags = ARC_WAIT;
428 arc_buf_t *abuf;
429 int blksz = BP_GET_LSIZE(bp);
430
431 if (arc_read(NULL, spa, bp, arc_getbuf_func, &abuf,
432 ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL,
433 &aflags, zb) != 0)
434 return (SET_ERROR(EIO));
435
436 err = dump_spill(dsp, zb->zb_object, blksz, abuf->b_data);
437 (void) arc_buf_remove_ref(abuf, &abuf);
438 } else { /* it's a level-0 block of a regular object */
439 uint32_t aflags = ARC_WAIT;
440 arc_buf_t *abuf;
441 int blksz = BP_GET_LSIZE(bp);
442
443 ASSERT0(zb->zb_level);
444 if (arc_read(NULL, spa, bp, arc_getbuf_func, &abuf,
445 ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL,
446 &aflags, zb) != 0) {
447 if (zfs_send_corrupt_data) {
448 uint64_t *ptr;
449 /* Send a block filled with 0x"zfs badd bloc" */
450 abuf = arc_buf_alloc(spa, blksz, &abuf,
451 ARC_BUFC_DATA);
452 for (ptr = abuf->b_data;
453 (char *)ptr < (char *)abuf->b_data + blksz;
454 ptr++)
455 *ptr = 0x2f5baddb10cULL;
456 } else {
457 return (SET_ERROR(EIO));
458 }
459 }
460
461 err = dump_data(dsp, type, zb->zb_object, zb->zb_blkid * blksz,
462 blksz, bp, abuf->b_data);
463 (void) arc_buf_remove_ref(abuf, &abuf);
464 }
465
466 ASSERT(err == 0 || err == EINTR);
467 return (err);
468 }
469
470 /*
471 * Releases dp using the specified tag.
472 */
473 static int
474 dmu_send_impl(void *tag, dsl_pool_t *dp, dsl_dataset_t *ds,
475 zfs_bookmark_phys_t *fromzb, boolean_t is_clone, int outfd,
476 vnode_t *vp, offset_t *off)
477 {
478 objset_t *os;
479 dmu_replay_record_t *drr;
480 dmu_sendarg_t *dsp;
481 int err;
482 uint64_t fromtxg = 0;
483
484 err = dmu_objset_from_ds(ds, &os);
485 if (err != 0) {
486 dsl_pool_rele(dp, tag);
487 return (err);
488 }
489
490 drr = kmem_zalloc(sizeof (dmu_replay_record_t), KM_SLEEP);
491 drr->drr_type = DRR_BEGIN;
492 drr->drr_u.drr_begin.drr_magic = DMU_BACKUP_MAGIC;
493 DMU_SET_STREAM_HDRTYPE(drr->drr_u.drr_begin.drr_versioninfo,
494 DMU_SUBSTREAM);
495
496 #ifdef _KERNEL
497 if (dmu_objset_type(os) == DMU_OST_ZFS) {
498 uint64_t version;
499 if (zfs_get_zplprop(os, ZFS_PROP_VERSION, &version) != 0) {
500 kmem_free(drr, sizeof (dmu_replay_record_t));
501 dsl_pool_rele(dp, tag);
502 return (SET_ERROR(EINVAL));
503 }
504 if (version >= ZPL_VERSION_SA) {
505 DMU_SET_FEATUREFLAGS(
506 drr->drr_u.drr_begin.drr_versioninfo,
507 DMU_BACKUP_FEATURE_SA_SPILL);
508 }
509 }
510 #endif
511
512 drr->drr_u.drr_begin.drr_creation_time =
513 ds->ds_phys->ds_creation_time;
514 drr->drr_u.drr_begin.drr_type = dmu_objset_type(os);
515 if (is_clone)
516 drr->drr_u.drr_begin.drr_flags |= DRR_FLAG_CLONE;
517 drr->drr_u.drr_begin.drr_toguid = ds->ds_phys->ds_guid;
518 if (ds->ds_phys->ds_flags & DS_FLAG_CI_DATASET)
519 drr->drr_u.drr_begin.drr_flags |= DRR_FLAG_CI_DATA;
520
521 if (fromzb != NULL) {
522 drr->drr_u.drr_begin.drr_fromguid = fromzb->zbm_guid;
523 fromtxg = fromzb->zbm_creation_txg;
524 }
525 dsl_dataset_name(ds, drr->drr_u.drr_begin.drr_toname);
526 if (!dsl_dataset_is_snapshot(ds)) {
527 (void) strlcat(drr->drr_u.drr_begin.drr_toname, "@--head--",
528 sizeof (drr->drr_u.drr_begin.drr_toname));
529 }
530
531 dsp = kmem_zalloc(sizeof (dmu_sendarg_t), KM_SLEEP);
532
533 dsp->dsa_drr = drr;
534 dsp->dsa_vp = vp;
535 dsp->dsa_outfd = outfd;
536 dsp->dsa_proc = curproc;
537 dsp->dsa_os = os;
538 dsp->dsa_off = off;
539 dsp->dsa_toguid = ds->ds_phys->ds_guid;
540 ZIO_SET_CHECKSUM(&dsp->dsa_zc, 0, 0, 0, 0);
541 dsp->dsa_pending_op = PENDING_NONE;
542 dsp->dsa_incremental = (fromzb != NULL);
543
544 mutex_enter(&ds->ds_sendstream_lock);
545 list_insert_head(&ds->ds_sendstreams, dsp);
546 mutex_exit(&ds->ds_sendstream_lock);
547
548 dsl_dataset_long_hold(ds, FTAG);
549 dsl_pool_rele(dp, tag);
550
551 if (dump_bytes(dsp, drr, sizeof (dmu_replay_record_t)) != 0) {
552 err = dsp->dsa_err;
553 goto out;
554 }
555
556 err = traverse_dataset(ds, fromtxg, TRAVERSE_PRE | TRAVERSE_PREFETCH,
557 backup_cb, dsp);
558
559 if (dsp->dsa_pending_op != PENDING_NONE)
560 if (dump_bytes(dsp, drr, sizeof (dmu_replay_record_t)) != 0)
561 err = SET_ERROR(EINTR);
562
563 if (err != 0) {
564 if (err == EINTR && dsp->dsa_err != 0)
565 err = dsp->dsa_err;
566 goto out;
567 }
568
569 bzero(drr, sizeof (dmu_replay_record_t));
570 drr->drr_type = DRR_END;
571 drr->drr_u.drr_end.drr_checksum = dsp->dsa_zc;
572 drr->drr_u.drr_end.drr_toguid = dsp->dsa_toguid;
573
574 if (dump_bytes(dsp, drr, sizeof (dmu_replay_record_t)) != 0) {
575 err = dsp->dsa_err;
576 goto out;
577 }
578
579 out:
580 mutex_enter(&ds->ds_sendstream_lock);
581 list_remove(&ds->ds_sendstreams, dsp);
582 mutex_exit(&ds->ds_sendstream_lock);
583
584 kmem_free(drr, sizeof (dmu_replay_record_t));
585 kmem_free(dsp, sizeof (dmu_sendarg_t));
586
587 dsl_dataset_long_rele(ds, FTAG);
588
589 return (err);
590 }
591
592 int
593 dmu_send_obj(const char *pool, uint64_t tosnap, uint64_t fromsnap,
594 int outfd, vnode_t *vp, offset_t *off)
595 {
596 dsl_pool_t *dp;
597 dsl_dataset_t *ds;
598 dsl_dataset_t *fromds = NULL;
599 int err;
600
601 err = dsl_pool_hold(pool, FTAG, &dp);
602 if (err != 0)
603 return (err);
604
605 err = dsl_dataset_hold_obj(dp, tosnap, FTAG, &ds);
606 if (err != 0) {
607 dsl_pool_rele(dp, FTAG);
608 return (err);
609 }
610
611 if (fromsnap != 0) {
612 zfs_bookmark_phys_t zb;
613 boolean_t is_clone;
614
615 err = dsl_dataset_hold_obj(dp, fromsnap, FTAG, &fromds);
616 if (err != 0) {
617 dsl_dataset_rele(ds, FTAG);
618 dsl_pool_rele(dp, FTAG);
619 return (err);
620 }
621 if (!dsl_dataset_is_before(ds, fromds, 0))
622 err = SET_ERROR(EXDEV);
623 zb.zbm_creation_time = fromds->ds_phys->ds_creation_time;
624 zb.zbm_creation_txg = fromds->ds_phys->ds_creation_txg;
625 zb.zbm_guid = fromds->ds_phys->ds_guid;
626 is_clone = (fromds->ds_dir != ds->ds_dir);
627 dsl_dataset_rele(fromds, FTAG);
628 err = dmu_send_impl(FTAG, dp, ds, &zb, is_clone,
629 outfd, vp, off);
630 } else {
631 err = dmu_send_impl(FTAG, dp, ds, NULL, B_FALSE,
632 outfd, vp, off);
633 }
634 dsl_dataset_rele(ds, FTAG);
635 return (err);
636 }
637
638 int
639 dmu_send(const char *tosnap, const char *fromsnap,
640 int outfd, vnode_t *vp, offset_t *off)
641 {
642 dsl_pool_t *dp;
643 dsl_dataset_t *ds;
644 int err;
645 boolean_t owned = B_FALSE;
646
647 if (fromsnap != NULL && strpbrk(fromsnap, "@#") == NULL)
648 return (SET_ERROR(EINVAL));
649
650 err = dsl_pool_hold(tosnap, FTAG, &dp);
651 if (err != 0)
652 return (err);
653
654 if (strchr(tosnap, '@') == NULL && spa_writeable(dp->dp_spa)) {
655 /*
656 * We are sending a filesystem or volume. Ensure
657 * that it doesn't change by owning the dataset.
658 */
659 err = dsl_dataset_own(dp, tosnap, FTAG, &ds);
660 owned = B_TRUE;
661 } else {
662 err = dsl_dataset_hold(dp, tosnap, FTAG, &ds);
663 }
664 if (err != 0) {
665 dsl_pool_rele(dp, FTAG);
666 return (err);
667 }
668
669 if (fromsnap != NULL) {
670 zfs_bookmark_phys_t zb;
671 boolean_t is_clone = B_FALSE;
672 int fsnamelen = strchr(tosnap, '@') - tosnap;
673
674 /*
675 * If the fromsnap is in a different filesystem, then
676 * mark the send stream as a clone.
677 */
678 if (strncmp(tosnap, fromsnap, fsnamelen) != 0 ||
679 (fromsnap[fsnamelen] != '@' &&
680 fromsnap[fsnamelen] != '#')) {
681 is_clone = B_TRUE;
682 }
683
684 if (strchr(fromsnap, '@')) {
685 dsl_dataset_t *fromds;
686 err = dsl_dataset_hold(dp, fromsnap, FTAG, &fromds);
687 if (err == 0) {
688 if (!dsl_dataset_is_before(ds, fromds, 0))
689 err = SET_ERROR(EXDEV);
690 zb.zbm_creation_time =
691 fromds->ds_phys->ds_creation_time;
692 zb.zbm_creation_txg =
693 fromds->ds_phys->ds_creation_txg;
694 zb.zbm_guid = fromds->ds_phys->ds_guid;
695 is_clone = (ds->ds_dir != fromds->ds_dir);
696 dsl_dataset_rele(fromds, FTAG);
697 }
698 } else {
699 err = dsl_bookmark_lookup(dp, fromsnap, ds, &zb);
700 }
701 if (err != 0) {
702 dsl_dataset_rele(ds, FTAG);
703 dsl_pool_rele(dp, FTAG);
704 return (err);
705 }
706 err = dmu_send_impl(FTAG, dp, ds, &zb, is_clone,
707 outfd, vp, off);
708 } else {
709 err = dmu_send_impl(FTAG, dp, ds, NULL, B_FALSE,
710 outfd, vp, off);
711 }
712 if (owned)
713 dsl_dataset_disown(ds, FTAG);
714 else
715 dsl_dataset_rele(ds, FTAG);
716 return (err);
717 }
718
719 int
720 dmu_send_estimate(dsl_dataset_t *ds, dsl_dataset_t *fromds, uint64_t *sizep)
721 {
722 int err;
723 uint64_t size, recordsize;
724 ASSERTV(dsl_pool_t *dp = ds->ds_dir->dd_pool);
725
726 ASSERT(dsl_pool_config_held(dp));
727
728 /* tosnap must be a snapshot */
729 if (!dsl_dataset_is_snapshot(ds))
730 return (SET_ERROR(EINVAL));
731
732 /*
733 * fromsnap must be an earlier snapshot from the same fs as tosnap,
734 * or the origin's fs.
735 */
736 if (fromds != NULL && !dsl_dataset_is_before(ds, fromds, 0))
737 return (SET_ERROR(EXDEV));
738
739 /* Get uncompressed size estimate of changed data. */
740 if (fromds == NULL) {
741 size = ds->ds_phys->ds_uncompressed_bytes;
742 } else {
743 uint64_t used, comp;
744 err = dsl_dataset_space_written(fromds, ds,
745 &used, &comp, &size);
746 if (err != 0)
747 return (err);
748 }
749
750 /*
751 * Assume that space (both on-disk and in-stream) is dominated by
752 * data. We will adjust for indirect blocks and the copies property,
753 * but ignore per-object space used (eg, dnodes and DRR_OBJECT records).
754 */
755
756 /*
757 * Subtract out approximate space used by indirect blocks.
758 * Assume most space is used by data blocks (non-indirect, non-dnode).
759 * Assume all blocks are recordsize. Assume ditto blocks and
760 * internal fragmentation counter out compression.
761 *
762 * Therefore, space used by indirect blocks is sizeof(blkptr_t) per
763 * block, which we observe in practice.
764 */
765 err = dsl_prop_get_int_ds(ds, "recordsize", &recordsize);
766 if (err != 0)
767 return (err);
768 size -= size / recordsize * sizeof (blkptr_t);
769
770 /* Add in the space for the record associated with each block. */
771 size += size / recordsize * sizeof (dmu_replay_record_t);
772
773 *sizep = size;
774
775 return (0);
776 }
777
778 typedef struct dmu_recv_begin_arg {
779 const char *drba_origin;
780 dmu_recv_cookie_t *drba_cookie;
781 cred_t *drba_cred;
782 uint64_t drba_snapobj;
783 } dmu_recv_begin_arg_t;
784
785 static int
786 recv_begin_check_existing_impl(dmu_recv_begin_arg_t *drba, dsl_dataset_t *ds,
787 uint64_t fromguid)
788 {
789 uint64_t val;
790 int error;
791 dsl_pool_t *dp = ds->ds_dir->dd_pool;
792
793 /* temporary clone name must not exist */
794 error = zap_lookup(dp->dp_meta_objset,
795 ds->ds_dir->dd_phys->dd_child_dir_zapobj, recv_clone_name,
796 8, 1, &val);
797 if (error != ENOENT)
798 return (error == 0 ? EBUSY : error);
799
800 /* new snapshot name must not exist */
801 error = zap_lookup(dp->dp_meta_objset,
802 ds->ds_phys->ds_snapnames_zapobj, drba->drba_cookie->drc_tosnap,
803 8, 1, &val);
804 if (error != ENOENT)
805 return (error == 0 ? EEXIST : error);
806
807 if (fromguid != 0) {
808 dsl_dataset_t *snap;
809 uint64_t obj = ds->ds_phys->ds_prev_snap_obj;
810
811 /* Find snapshot in this dir that matches fromguid. */
812 while (obj != 0) {
813 error = dsl_dataset_hold_obj(dp, obj, FTAG,
814 &snap);
815 if (error != 0)
816 return (SET_ERROR(ENODEV));
817 if (snap->ds_dir != ds->ds_dir) {
818 dsl_dataset_rele(snap, FTAG);
819 return (SET_ERROR(ENODEV));
820 }
821 if (snap->ds_phys->ds_guid == fromguid)
822 break;
823 obj = snap->ds_phys->ds_prev_snap_obj;
824 dsl_dataset_rele(snap, FTAG);
825 }
826 if (obj == 0)
827 return (SET_ERROR(ENODEV));
828
829 if (drba->drba_cookie->drc_force) {
830 drba->drba_snapobj = obj;
831 } else {
832 /*
833 * If we are not forcing, there must be no
834 * changes since fromsnap.
835 */
836 if (dsl_dataset_modified_since_snap(ds, snap)) {
837 dsl_dataset_rele(snap, FTAG);
838 return (SET_ERROR(ETXTBSY));
839 }
840 drba->drba_snapobj = ds->ds_prev->ds_object;
841 }
842
843 dsl_dataset_rele(snap, FTAG);
844 } else {
845 /* if full, most recent snapshot must be $ORIGIN */
846 if (ds->ds_phys->ds_prev_snap_txg >= TXG_INITIAL)
847 return (SET_ERROR(ENODEV));
848 drba->drba_snapobj = ds->ds_phys->ds_prev_snap_obj;
849 }
850
851 return (0);
852
853 }
854
855 static int
856 dmu_recv_begin_check(void *arg, dmu_tx_t *tx)
857 {
858 dmu_recv_begin_arg_t *drba = arg;
859 dsl_pool_t *dp = dmu_tx_pool(tx);
860 struct drr_begin *drrb = drba->drba_cookie->drc_drrb;
861 uint64_t fromguid = drrb->drr_fromguid;
862 int flags = drrb->drr_flags;
863 int error;
864 dsl_dataset_t *ds;
865 const char *tofs = drba->drba_cookie->drc_tofs;
866
867 /* already checked */
868 ASSERT3U(drrb->drr_magic, ==, DMU_BACKUP_MAGIC);
869
870 if (DMU_GET_STREAM_HDRTYPE(drrb->drr_versioninfo) ==
871 DMU_COMPOUNDSTREAM ||
872 drrb->drr_type >= DMU_OST_NUMTYPES ||
873 ((flags & DRR_FLAG_CLONE) && drba->drba_origin == NULL))
874 return (SET_ERROR(EINVAL));
875
876 /* Verify pool version supports SA if SA_SPILL feature set */
877 if ((DMU_GET_FEATUREFLAGS(drrb->drr_versioninfo) &
878 DMU_BACKUP_FEATURE_SA_SPILL) &&
879 spa_version(dp->dp_spa) < SPA_VERSION_SA) {
880 return (SET_ERROR(ENOTSUP));
881 }
882
883 error = dsl_dataset_hold(dp, tofs, FTAG, &ds);
884 if (error == 0) {
885 /* target fs already exists; recv into temp clone */
886
887 /* Can't recv a clone into an existing fs */
888 if (flags & DRR_FLAG_CLONE) {
889 dsl_dataset_rele(ds, FTAG);
890 return (SET_ERROR(EINVAL));
891 }
892
893 error = recv_begin_check_existing_impl(drba, ds, fromguid);
894 dsl_dataset_rele(ds, FTAG);
895 } else if (error == ENOENT) {
896 /* target fs does not exist; must be a full backup or clone */
897 char buf[MAXNAMELEN];
898
899 /*
900 * If it's a non-clone incremental, we are missing the
901 * target fs, so fail the recv.
902 */
903 if (fromguid != 0 && !(flags & DRR_FLAG_CLONE))
904 return (SET_ERROR(ENOENT));
905
906 /* Open the parent of tofs */
907 ASSERT3U(strlen(tofs), <, MAXNAMELEN);
908 (void) strlcpy(buf, tofs, strrchr(tofs, '/') - tofs + 1);
909 error = dsl_dataset_hold(dp, buf, FTAG, &ds);
910 if (error != 0)
911 return (error);
912
913 if (drba->drba_origin != NULL) {
914 dsl_dataset_t *origin;
915 error = dsl_dataset_hold(dp, drba->drba_origin,
916 FTAG, &origin);
917 if (error != 0) {
918 dsl_dataset_rele(ds, FTAG);
919 return (error);
920 }
921 if (!dsl_dataset_is_snapshot(origin)) {
922 dsl_dataset_rele(origin, FTAG);
923 dsl_dataset_rele(ds, FTAG);
924 return (SET_ERROR(EINVAL));
925 }
926 if (origin->ds_phys->ds_guid != fromguid) {
927 dsl_dataset_rele(origin, FTAG);
928 dsl_dataset_rele(ds, FTAG);
929 return (SET_ERROR(ENODEV));
930 }
931 dsl_dataset_rele(origin, FTAG);
932 }
933 dsl_dataset_rele(ds, FTAG);
934 error = 0;
935 }
936 return (error);
937 }
938
939 static void
940 dmu_recv_begin_sync(void *arg, dmu_tx_t *tx)
941 {
942 dmu_recv_begin_arg_t *drba = arg;
943 dsl_pool_t *dp = dmu_tx_pool(tx);
944 struct drr_begin *drrb = drba->drba_cookie->drc_drrb;
945 const char *tofs = drba->drba_cookie->drc_tofs;
946 dsl_dataset_t *ds, *newds;
947 uint64_t dsobj;
948 int error;
949 uint64_t crflags;
950
951 crflags = (drrb->drr_flags & DRR_FLAG_CI_DATA) ?
952 DS_FLAG_CI_DATASET : 0;
953
954 error = dsl_dataset_hold(dp, tofs, FTAG, &ds);
955 if (error == 0) {
956 /* create temporary clone */
957 dsl_dataset_t *snap = NULL;
958 if (drba->drba_snapobj != 0) {
959 VERIFY0(dsl_dataset_hold_obj(dp,
960 drba->drba_snapobj, FTAG, &snap));
961 }
962 dsobj = dsl_dataset_create_sync(ds->ds_dir, recv_clone_name,
963 snap, crflags, drba->drba_cred, tx);
964 dsl_dataset_rele(snap, FTAG);
965 dsl_dataset_rele(ds, FTAG);
966 } else {
967 dsl_dir_t *dd;
968 const char *tail;
969 dsl_dataset_t *origin = NULL;
970
971 VERIFY0(dsl_dir_hold(dp, tofs, FTAG, &dd, &tail));
972
973 if (drba->drba_origin != NULL) {
974 VERIFY0(dsl_dataset_hold(dp, drba->drba_origin,
975 FTAG, &origin));
976 }
977
978 /* Create new dataset. */
979 dsobj = dsl_dataset_create_sync(dd,
980 strrchr(tofs, '/') + 1,
981 origin, crflags, drba->drba_cred, tx);
982 if (origin != NULL)
983 dsl_dataset_rele(origin, FTAG);
984 dsl_dir_rele(dd, FTAG);
985 drba->drba_cookie->drc_newfs = B_TRUE;
986 }
987 VERIFY0(dsl_dataset_own_obj(dp, dsobj, dmu_recv_tag, &newds));
988
989 dmu_buf_will_dirty(newds->ds_dbuf, tx);
990 newds->ds_phys->ds_flags |= DS_FLAG_INCONSISTENT;
991
992 /*
993 * If we actually created a non-clone, we need to create the
994 * objset in our new dataset.
995 */
996 if (BP_IS_HOLE(dsl_dataset_get_blkptr(newds))) {
997 (void) dmu_objset_create_impl(dp->dp_spa,
998 newds, dsl_dataset_get_blkptr(newds), drrb->drr_type, tx);
999 }
1000
1001 drba->drba_cookie->drc_ds = newds;
1002
1003 spa_history_log_internal_ds(newds, "receive", tx, "");
1004 }
1005
1006 /*
1007 * NB: callers *MUST* call dmu_recv_stream() if dmu_recv_begin()
1008 * succeeds; otherwise we will leak the holds on the datasets.
1009 */
1010 int
1011 dmu_recv_begin(char *tofs, char *tosnap, struct drr_begin *drrb,
1012 boolean_t force, char *origin, dmu_recv_cookie_t *drc)
1013 {
1014 dmu_recv_begin_arg_t drba = { 0 };
1015 dmu_replay_record_t *drr;
1016
1017 bzero(drc, sizeof (dmu_recv_cookie_t));
1018 drc->drc_drrb = drrb;
1019 drc->drc_tosnap = tosnap;
1020 drc->drc_tofs = tofs;
1021 drc->drc_force = force;
1022
1023 if (drrb->drr_magic == BSWAP_64(DMU_BACKUP_MAGIC))
1024 drc->drc_byteswap = B_TRUE;
1025 else if (drrb->drr_magic != DMU_BACKUP_MAGIC)
1026 return (SET_ERROR(EINVAL));
1027
1028 drr = kmem_zalloc(sizeof (dmu_replay_record_t), KM_SLEEP);
1029 drr->drr_type = DRR_BEGIN;
1030 drr->drr_u.drr_begin = *drc->drc_drrb;
1031 if (drc->drc_byteswap) {
1032 fletcher_4_incremental_byteswap(drr,
1033 sizeof (dmu_replay_record_t), &drc->drc_cksum);
1034 } else {
1035 fletcher_4_incremental_native(drr,
1036 sizeof (dmu_replay_record_t), &drc->drc_cksum);
1037 }
1038 kmem_free(drr, sizeof (dmu_replay_record_t));
1039
1040 if (drc->drc_byteswap) {
1041 drrb->drr_magic = BSWAP_64(drrb->drr_magic);
1042 drrb->drr_versioninfo = BSWAP_64(drrb->drr_versioninfo);
1043 drrb->drr_creation_time = BSWAP_64(drrb->drr_creation_time);
1044 drrb->drr_type = BSWAP_32(drrb->drr_type);
1045 drrb->drr_toguid = BSWAP_64(drrb->drr_toguid);
1046 drrb->drr_fromguid = BSWAP_64(drrb->drr_fromguid);
1047 }
1048
1049 drba.drba_origin = origin;
1050 drba.drba_cookie = drc;
1051 drba.drba_cred = CRED();
1052
1053 return (dsl_sync_task(tofs, dmu_recv_begin_check, dmu_recv_begin_sync,
1054 &drba, 5));
1055 }
1056
1057 struct restorearg {
1058 int err;
1059 boolean_t byteswap;
1060 vnode_t *vp;
1061 char *buf;
1062 uint64_t voff;
1063 int bufsize; /* amount of memory allocated for buf */
1064 zio_cksum_t cksum;
1065 avl_tree_t *guid_to_ds_map;
1066 };
1067
1068 typedef struct guid_map_entry {
1069 uint64_t guid;
1070 dsl_dataset_t *gme_ds;
1071 avl_node_t avlnode;
1072 } guid_map_entry_t;
1073
1074 static int
1075 guid_compare(const void *arg1, const void *arg2)
1076 {
1077 const guid_map_entry_t *gmep1 = arg1;
1078 const guid_map_entry_t *gmep2 = arg2;
1079
1080 if (gmep1->guid < gmep2->guid)
1081 return (-1);
1082 else if (gmep1->guid > gmep2->guid)
1083 return (1);
1084 return (0);
1085 }
1086
1087 static void
1088 free_guid_map_onexit(void *arg)
1089 {
1090 avl_tree_t *ca = arg;
1091 void *cookie = NULL;
1092 guid_map_entry_t *gmep;
1093
1094 while ((gmep = avl_destroy_nodes(ca, &cookie)) != NULL) {
1095 dsl_dataset_long_rele(gmep->gme_ds, gmep);
1096 dsl_dataset_rele(gmep->gme_ds, gmep);
1097 kmem_free(gmep, sizeof (guid_map_entry_t));
1098 }
1099 avl_destroy(ca);
1100 kmem_free(ca, sizeof (avl_tree_t));
1101 }
1102
1103 static void *
1104 restore_read(struct restorearg *ra, int len)
1105 {
1106 void *rv;
1107 int done = 0;
1108
1109 /* some things will require 8-byte alignment, so everything must */
1110 ASSERT0(len % 8);
1111
1112 while (done < len) {
1113 ssize_t resid;
1114
1115 ra->err = vn_rdwr(UIO_READ, ra->vp,
1116 (caddr_t)ra->buf + done, len - done,
1117 ra->voff, UIO_SYSSPACE, FAPPEND,
1118 RLIM64_INFINITY, CRED(), &resid);
1119
1120 if (resid == len - done)
1121 ra->err = SET_ERROR(EINVAL);
1122 ra->voff += len - done - resid;
1123 done = len - resid;
1124 if (ra->err != 0)
1125 return (NULL);
1126 }
1127
1128 ASSERT3U(done, ==, len);
1129 rv = ra->buf;
1130 if (ra->byteswap)
1131 fletcher_4_incremental_byteswap(rv, len, &ra->cksum);
1132 else
1133 fletcher_4_incremental_native(rv, len, &ra->cksum);
1134 return (rv);
1135 }
1136
1137 noinline static void
1138 backup_byteswap(dmu_replay_record_t *drr)
1139 {
1140 #define DO64(X) (drr->drr_u.X = BSWAP_64(drr->drr_u.X))
1141 #define DO32(X) (drr->drr_u.X = BSWAP_32(drr->drr_u.X))
1142 drr->drr_type = BSWAP_32(drr->drr_type);
1143 drr->drr_payloadlen = BSWAP_32(drr->drr_payloadlen);
1144 switch (drr->drr_type) {
1145 case DRR_BEGIN:
1146 DO64(drr_begin.drr_magic);
1147 DO64(drr_begin.drr_versioninfo);
1148 DO64(drr_begin.drr_creation_time);
1149 DO32(drr_begin.drr_type);
1150 DO32(drr_begin.drr_flags);
1151 DO64(drr_begin.drr_toguid);
1152 DO64(drr_begin.drr_fromguid);
1153 break;
1154 case DRR_OBJECT:
1155 DO64(drr_object.drr_object);
1156 /* DO64(drr_object.drr_allocation_txg); */
1157 DO32(drr_object.drr_type);
1158 DO32(drr_object.drr_bonustype);
1159 DO32(drr_object.drr_blksz);
1160 DO32(drr_object.drr_bonuslen);
1161 DO64(drr_object.drr_toguid);
1162 break;
1163 case DRR_FREEOBJECTS:
1164 DO64(drr_freeobjects.drr_firstobj);
1165 DO64(drr_freeobjects.drr_numobjs);
1166 DO64(drr_freeobjects.drr_toguid);
1167 break;
1168 case DRR_WRITE:
1169 DO64(drr_write.drr_object);
1170 DO32(drr_write.drr_type);
1171 DO64(drr_write.drr_offset);
1172 DO64(drr_write.drr_length);
1173 DO64(drr_write.drr_toguid);
1174 DO64(drr_write.drr_key.ddk_cksum.zc_word[0]);
1175 DO64(drr_write.drr_key.ddk_cksum.zc_word[1]);
1176 DO64(drr_write.drr_key.ddk_cksum.zc_word[2]);
1177 DO64(drr_write.drr_key.ddk_cksum.zc_word[3]);
1178 DO64(drr_write.drr_key.ddk_prop);
1179 break;
1180 case DRR_WRITE_BYREF:
1181 DO64(drr_write_byref.drr_object);
1182 DO64(drr_write_byref.drr_offset);
1183 DO64(drr_write_byref.drr_length);
1184 DO64(drr_write_byref.drr_toguid);
1185 DO64(drr_write_byref.drr_refguid);
1186 DO64(drr_write_byref.drr_refobject);
1187 DO64(drr_write_byref.drr_refoffset);
1188 DO64(drr_write_byref.drr_key.ddk_cksum.zc_word[0]);
1189 DO64(drr_write_byref.drr_key.ddk_cksum.zc_word[1]);
1190 DO64(drr_write_byref.drr_key.ddk_cksum.zc_word[2]);
1191 DO64(drr_write_byref.drr_key.ddk_cksum.zc_word[3]);
1192 DO64(drr_write_byref.drr_key.ddk_prop);
1193 break;
1194 case DRR_FREE:
1195 DO64(drr_free.drr_object);
1196 DO64(drr_free.drr_offset);
1197 DO64(drr_free.drr_length);
1198 DO64(drr_free.drr_toguid);
1199 break;
1200 case DRR_SPILL:
1201 DO64(drr_spill.drr_object);
1202 DO64(drr_spill.drr_length);
1203 DO64(drr_spill.drr_toguid);
1204 break;
1205 case DRR_END:
1206 DO64(drr_end.drr_checksum.zc_word[0]);
1207 DO64(drr_end.drr_checksum.zc_word[1]);
1208 DO64(drr_end.drr_checksum.zc_word[2]);
1209 DO64(drr_end.drr_checksum.zc_word[3]);
1210 DO64(drr_end.drr_toguid);
1211 break;
1212 default:
1213 break;
1214 }
1215 #undef DO64
1216 #undef DO32
1217 }
1218
1219 noinline static int
1220 restore_object(struct restorearg *ra, objset_t *os, struct drr_object *drro)
1221 {
1222 int err;
1223 dmu_tx_t *tx;
1224 void *data = NULL;
1225
1226 if (drro->drr_type == DMU_OT_NONE ||
1227 !DMU_OT_IS_VALID(drro->drr_type) ||
1228 !DMU_OT_IS_VALID(drro->drr_bonustype) ||
1229 drro->drr_checksumtype >= ZIO_CHECKSUM_FUNCTIONS ||
1230 drro->drr_compress >= ZIO_COMPRESS_FUNCTIONS ||
1231 P2PHASE(drro->drr_blksz, SPA_MINBLOCKSIZE) ||
1232 drro->drr_blksz < SPA_MINBLOCKSIZE ||
1233 drro->drr_blksz > SPA_MAXBLOCKSIZE ||
1234 drro->drr_bonuslen > DN_MAX_BONUSLEN) {
1235 return (SET_ERROR(EINVAL));
1236 }
1237
1238 err = dmu_object_info(os, drro->drr_object, NULL);
1239
1240 if (err != 0 && err != ENOENT)
1241 return (SET_ERROR(EINVAL));
1242
1243 if (drro->drr_bonuslen) {
1244 data = restore_read(ra, P2ROUNDUP(drro->drr_bonuslen, 8));
1245 if (ra->err != 0)
1246 return (ra->err);
1247 }
1248
1249 if (err == ENOENT) {
1250 /* currently free, want to be allocated */
1251 tx = dmu_tx_create(os);
1252 dmu_tx_hold_bonus(tx, DMU_NEW_OBJECT);
1253 err = dmu_tx_assign(tx, TXG_WAIT);
1254 if (err != 0) {
1255 dmu_tx_abort(tx);
1256 return (err);
1257 }
1258 err = dmu_object_claim(os, drro->drr_object,
1259 drro->drr_type, drro->drr_blksz,
1260 drro->drr_bonustype, drro->drr_bonuslen, tx);
1261 dmu_tx_commit(tx);
1262 } else {
1263 /* currently allocated, want to be allocated */
1264 err = dmu_object_reclaim(os, drro->drr_object,
1265 drro->drr_type, drro->drr_blksz,
1266 drro->drr_bonustype, drro->drr_bonuslen);
1267 }
1268 if (err != 0) {
1269 return (SET_ERROR(EINVAL));
1270 }
1271
1272 tx = dmu_tx_create(os);
1273 dmu_tx_hold_bonus(tx, drro->drr_object);
1274 err = dmu_tx_assign(tx, TXG_WAIT);
1275 if (err != 0) {
1276 dmu_tx_abort(tx);
1277 return (err);
1278 }
1279
1280 dmu_object_set_checksum(os, drro->drr_object, drro->drr_checksumtype,
1281 tx);
1282 dmu_object_set_compress(os, drro->drr_object, drro->drr_compress, tx);
1283
1284 if (data != NULL) {
1285 dmu_buf_t *db;
1286
1287 VERIFY(0 == dmu_bonus_hold(os, drro->drr_object, FTAG, &db));
1288 dmu_buf_will_dirty(db, tx);
1289
1290 ASSERT3U(db->db_size, >=, drro->drr_bonuslen);
1291 bcopy(data, db->db_data, drro->drr_bonuslen);
1292 if (ra->byteswap) {
1293 dmu_object_byteswap_t byteswap =
1294 DMU_OT_BYTESWAP(drro->drr_bonustype);
1295 dmu_ot_byteswap[byteswap].ob_func(db->db_data,
1296 drro->drr_bonuslen);
1297 }
1298 dmu_buf_rele(db, FTAG);
1299 }
1300 dmu_tx_commit(tx);
1301 return (0);
1302 }
1303
1304 /* ARGSUSED */
1305 noinline static int
1306 restore_freeobjects(struct restorearg *ra, objset_t *os,
1307 struct drr_freeobjects *drrfo)
1308 {
1309 uint64_t obj;
1310
1311 if (drrfo->drr_firstobj + drrfo->drr_numobjs < drrfo->drr_firstobj)
1312 return (SET_ERROR(EINVAL));
1313
1314 for (obj = drrfo->drr_firstobj;
1315 obj < drrfo->drr_firstobj + drrfo->drr_numobjs;
1316 (void) dmu_object_next(os, &obj, FALSE, 0)) {
1317 int err;
1318
1319 if (dmu_object_info(os, obj, NULL) != 0)
1320 continue;
1321
1322 err = dmu_free_long_object(os, obj);
1323 if (err != 0)
1324 return (err);
1325 }
1326 return (0);
1327 }
1328
1329 noinline static int
1330 restore_write(struct restorearg *ra, objset_t *os,
1331 struct drr_write *drrw)
1332 {
1333 dmu_tx_t *tx;
1334 void *data;
1335 int err;
1336
1337 if (drrw->drr_offset + drrw->drr_length < drrw->drr_offset ||
1338 !DMU_OT_IS_VALID(drrw->drr_type))
1339 return (SET_ERROR(EINVAL));
1340
1341 data = restore_read(ra, drrw->drr_length);
1342 if (data == NULL)
1343 return (ra->err);
1344
1345 if (dmu_object_info(os, drrw->drr_object, NULL) != 0)
1346 return (SET_ERROR(EINVAL));
1347
1348 tx = dmu_tx_create(os);
1349
1350 dmu_tx_hold_write(tx, drrw->drr_object,
1351 drrw->drr_offset, drrw->drr_length);
1352 err = dmu_tx_assign(tx, TXG_WAIT);
1353 if (err != 0) {
1354 dmu_tx_abort(tx);
1355 return (err);
1356 }
1357 if (ra->byteswap) {
1358 dmu_object_byteswap_t byteswap =
1359 DMU_OT_BYTESWAP(drrw->drr_type);
1360 dmu_ot_byteswap[byteswap].ob_func(data, drrw->drr_length);
1361 }
1362 dmu_write(os, drrw->drr_object,
1363 drrw->drr_offset, drrw->drr_length, data, tx);
1364 dmu_tx_commit(tx);
1365 return (0);
1366 }
1367
1368 /*
1369 * Handle a DRR_WRITE_BYREF record. This record is used in dedup'ed
1370 * streams to refer to a copy of the data that is already on the
1371 * system because it came in earlier in the stream. This function
1372 * finds the earlier copy of the data, and uses that copy instead of
1373 * data from the stream to fulfill this write.
1374 */
1375 static int
1376 restore_write_byref(struct restorearg *ra, objset_t *os,
1377 struct drr_write_byref *drrwbr)
1378 {
1379 dmu_tx_t *tx;
1380 int err;
1381 guid_map_entry_t gmesrch;
1382 guid_map_entry_t *gmep;
1383 avl_index_t where;
1384 objset_t *ref_os = NULL;
1385 dmu_buf_t *dbp;
1386
1387 if (drrwbr->drr_offset + drrwbr->drr_length < drrwbr->drr_offset)
1388 return (SET_ERROR(EINVAL));
1389
1390 /*
1391 * If the GUID of the referenced dataset is different from the
1392 * GUID of the target dataset, find the referenced dataset.
1393 */
1394 if (drrwbr->drr_toguid != drrwbr->drr_refguid) {
1395 gmesrch.guid = drrwbr->drr_refguid;
1396 if ((gmep = avl_find(ra->guid_to_ds_map, &gmesrch,
1397 &where)) == NULL) {
1398 return (SET_ERROR(EINVAL));
1399 }
1400 if (dmu_objset_from_ds(gmep->gme_ds, &ref_os))
1401 return (SET_ERROR(EINVAL));
1402 } else {
1403 ref_os = os;
1404 }
1405
1406 err = dmu_buf_hold(ref_os, drrwbr->drr_refobject,
1407 drrwbr->drr_refoffset, FTAG, &dbp, DMU_READ_PREFETCH);
1408 if (err)
1409 return (err);
1410
1411 tx = dmu_tx_create(os);
1412
1413 dmu_tx_hold_write(tx, drrwbr->drr_object,
1414 drrwbr->drr_offset, drrwbr->drr_length);
1415 err = dmu_tx_assign(tx, TXG_WAIT);
1416 if (err != 0) {
1417 dmu_tx_abort(tx);
1418 return (err);
1419 }
1420 dmu_write(os, drrwbr->drr_object,
1421 drrwbr->drr_offset, drrwbr->drr_length, dbp->db_data, tx);
1422 dmu_buf_rele(dbp, FTAG);
1423 dmu_tx_commit(tx);
1424 return (0);
1425 }
1426
1427 static int
1428 restore_spill(struct restorearg *ra, objset_t *os, struct drr_spill *drrs)
1429 {
1430 dmu_tx_t *tx;
1431 void *data;
1432 dmu_buf_t *db, *db_spill;
1433 int err;
1434
1435 if (drrs->drr_length < SPA_MINBLOCKSIZE ||
1436 drrs->drr_length > SPA_MAXBLOCKSIZE)
1437 return (SET_ERROR(EINVAL));
1438
1439 data = restore_read(ra, drrs->drr_length);
1440 if (data == NULL)
1441 return (ra->err);
1442
1443 if (dmu_object_info(os, drrs->drr_object, NULL) != 0)
1444 return (SET_ERROR(EINVAL));
1445
1446 VERIFY(0 == dmu_bonus_hold(os, drrs->drr_object, FTAG, &db));
1447 if ((err = dmu_spill_hold_by_bonus(db, FTAG, &db_spill)) != 0) {
1448 dmu_buf_rele(db, FTAG);
1449 return (err);
1450 }
1451
1452 tx = dmu_tx_create(os);
1453
1454 dmu_tx_hold_spill(tx, db->db_object);
1455
1456 err = dmu_tx_assign(tx, TXG_WAIT);
1457 if (err != 0) {
1458 dmu_buf_rele(db, FTAG);
1459 dmu_buf_rele(db_spill, FTAG);
1460 dmu_tx_abort(tx);
1461 return (err);
1462 }
1463 dmu_buf_will_dirty(db_spill, tx);
1464
1465 if (db_spill->db_size < drrs->drr_length)
1466 VERIFY(0 == dbuf_spill_set_blksz(db_spill,
1467 drrs->drr_length, tx));
1468 bcopy(data, db_spill->db_data, drrs->drr_length);
1469
1470 dmu_buf_rele(db, FTAG);
1471 dmu_buf_rele(db_spill, FTAG);
1472
1473 dmu_tx_commit(tx);
1474 return (0);
1475 }
1476
1477 /* ARGSUSED */
1478 noinline static int
1479 restore_free(struct restorearg *ra, objset_t *os,
1480 struct drr_free *drrf)
1481 {
1482 int err;
1483
1484 if (drrf->drr_length != -1ULL &&
1485 drrf->drr_offset + drrf->drr_length < drrf->drr_offset)
1486 return (SET_ERROR(EINVAL));
1487
1488 if (dmu_object_info(os, drrf->drr_object, NULL) != 0)
1489 return (SET_ERROR(EINVAL));
1490
1491 err = dmu_free_long_range(os, drrf->drr_object,
1492 drrf->drr_offset, drrf->drr_length);
1493 return (err);
1494 }
1495
1496 /* used to destroy the drc_ds on error */
1497 static void
1498 dmu_recv_cleanup_ds(dmu_recv_cookie_t *drc)
1499 {
1500 char name[MAXNAMELEN];
1501 dsl_dataset_name(drc->drc_ds, name);
1502 dsl_dataset_disown(drc->drc_ds, dmu_recv_tag);
1503 (void) dsl_destroy_head(name);
1504 }
1505
1506 /*
1507 * NB: callers *must* call dmu_recv_end() if this succeeds.
1508 */
1509 int
1510 dmu_recv_stream(dmu_recv_cookie_t *drc, vnode_t *vp, offset_t *voffp,
1511 int cleanup_fd, uint64_t *action_handlep)
1512 {
1513 struct restorearg ra = { 0 };
1514 dmu_replay_record_t *drr;
1515 objset_t *os;
1516 zio_cksum_t pcksum;
1517 int featureflags;
1518
1519 ra.byteswap = drc->drc_byteswap;
1520 ra.cksum = drc->drc_cksum;
1521 ra.vp = vp;
1522 ra.voff = *voffp;
1523 ra.bufsize = 1<<20;
1524 ra.buf = vmem_alloc(ra.bufsize, KM_SLEEP);
1525
1526 /* these were verified in dmu_recv_begin */
1527 ASSERT3U(DMU_GET_STREAM_HDRTYPE(drc->drc_drrb->drr_versioninfo), ==,
1528 DMU_SUBSTREAM);
1529 ASSERT3U(drc->drc_drrb->drr_type, <, DMU_OST_NUMTYPES);
1530
1531 /*
1532 * Open the objset we are modifying.
1533 */
1534 VERIFY0(dmu_objset_from_ds(drc->drc_ds, &os));
1535
1536 ASSERT(drc->drc_ds->ds_phys->ds_flags & DS_FLAG_INCONSISTENT);
1537
1538 featureflags = DMU_GET_FEATUREFLAGS(drc->drc_drrb->drr_versioninfo);
1539
1540 /* if this stream is dedup'ed, set up the avl tree for guid mapping */
1541 if (featureflags & DMU_BACKUP_FEATURE_DEDUP) {
1542 minor_t minor;
1543
1544 if (cleanup_fd == -1) {
1545 ra.err = SET_ERROR(EBADF);
1546 goto out;
1547 }
1548 ra.err = zfs_onexit_fd_hold(cleanup_fd, &minor);
1549 if (ra.err != 0) {
1550 cleanup_fd = -1;
1551 goto out;
1552 }
1553
1554 if (*action_handlep == 0) {
1555 ra.guid_to_ds_map =
1556 kmem_alloc(sizeof (avl_tree_t), KM_SLEEP);
1557 avl_create(ra.guid_to_ds_map, guid_compare,
1558 sizeof (guid_map_entry_t),
1559 offsetof(guid_map_entry_t, avlnode));
1560 ra.err = zfs_onexit_add_cb(minor,
1561 free_guid_map_onexit, ra.guid_to_ds_map,
1562 action_handlep);
1563 if (ra.err != 0)
1564 goto out;
1565 } else {
1566 ra.err = zfs_onexit_cb_data(minor, *action_handlep,
1567 (void **)&ra.guid_to_ds_map);
1568 if (ra.err != 0)
1569 goto out;
1570 }
1571
1572 drc->drc_guid_to_ds_map = ra.guid_to_ds_map;
1573 }
1574
1575 /*
1576 * Read records and process them.
1577 */
1578 pcksum = ra.cksum;
1579 while (ra.err == 0 &&
1580 NULL != (drr = restore_read(&ra, sizeof (*drr)))) {
1581 if (issig(JUSTLOOKING) && issig(FORREAL)) {
1582 ra.err = SET_ERROR(EINTR);
1583 goto out;
1584 }
1585
1586 if (ra.byteswap)
1587 backup_byteswap(drr);
1588
1589 switch (drr->drr_type) {
1590 case DRR_OBJECT:
1591 {
1592 /*
1593 * We need to make a copy of the record header,
1594 * because restore_{object,write} may need to
1595 * restore_read(), which will invalidate drr.
1596 */
1597 struct drr_object drro = drr->drr_u.drr_object;
1598 ra.err = restore_object(&ra, os, &drro);
1599 break;
1600 }
1601 case DRR_FREEOBJECTS:
1602 {
1603 struct drr_freeobjects drrfo =
1604 drr->drr_u.drr_freeobjects;
1605 ra.err = restore_freeobjects(&ra, os, &drrfo);
1606 break;
1607 }
1608 case DRR_WRITE:
1609 {
1610 struct drr_write drrw = drr->drr_u.drr_write;
1611 ra.err = restore_write(&ra, os, &drrw);
1612 break;
1613 }
1614 case DRR_WRITE_BYREF:
1615 {
1616 struct drr_write_byref drrwbr =
1617 drr->drr_u.drr_write_byref;
1618 ra.err = restore_write_byref(&ra, os, &drrwbr);
1619 break;
1620 }
1621 case DRR_FREE:
1622 {
1623 struct drr_free drrf = drr->drr_u.drr_free;
1624 ra.err = restore_free(&ra, os, &drrf);
1625 break;
1626 }
1627 case DRR_END:
1628 {
1629 struct drr_end drre = drr->drr_u.drr_end;
1630 /*
1631 * We compare against the *previous* checksum
1632 * value, because the stored checksum is of
1633 * everything before the DRR_END record.
1634 */
1635 if (!ZIO_CHECKSUM_EQUAL(drre.drr_checksum, pcksum))
1636 ra.err = SET_ERROR(ECKSUM);
1637 goto out;
1638 }
1639 case DRR_SPILL:
1640 {
1641 struct drr_spill drrs = drr->drr_u.drr_spill;
1642 ra.err = restore_spill(&ra, os, &drrs);
1643 break;
1644 }
1645 default:
1646 ra.err = SET_ERROR(EINVAL);
1647 goto out;
1648 }
1649 pcksum = ra.cksum;
1650 }
1651 ASSERT(ra.err != 0);
1652
1653 out:
1654 if ((featureflags & DMU_BACKUP_FEATURE_DEDUP) && (cleanup_fd != -1))
1655 zfs_onexit_fd_rele(cleanup_fd);
1656
1657 if (ra.err != 0) {
1658 /*
1659 * destroy what we created, so we don't leave it in the
1660 * inconsistent restoring state.
1661 */
1662 dmu_recv_cleanup_ds(drc);
1663 }
1664
1665 vmem_free(ra.buf, ra.bufsize);
1666 *voffp = ra.voff;
1667 return (ra.err);
1668 }
1669
1670 static int
1671 dmu_recv_end_check(void *arg, dmu_tx_t *tx)
1672 {
1673 dmu_recv_cookie_t *drc = arg;
1674 dsl_pool_t *dp = dmu_tx_pool(tx);
1675 int error;
1676
1677 ASSERT3P(drc->drc_ds->ds_owner, ==, dmu_recv_tag);
1678
1679 if (!drc->drc_newfs) {
1680 dsl_dataset_t *origin_head;
1681
1682 error = dsl_dataset_hold(dp, drc->drc_tofs, FTAG, &origin_head);
1683 if (error != 0)
1684 return (error);
1685 if (drc->drc_force) {
1686 /*
1687 * We will destroy any snapshots in tofs (i.e. before
1688 * origin_head) that are after the origin (which is
1689 * the snap before drc_ds, because drc_ds can not
1690 * have any snaps of its own).
1691 */
1692 uint64_t obj = origin_head->ds_phys->ds_prev_snap_obj;
1693 while (obj != drc->drc_ds->ds_phys->ds_prev_snap_obj) {
1694 dsl_dataset_t *snap;
1695 error = dsl_dataset_hold_obj(dp, obj, FTAG,
1696 &snap);
1697 if (error != 0)
1698 return (error);
1699 if (snap->ds_dir != origin_head->ds_dir)
1700 error = SET_ERROR(EINVAL);
1701 if (error == 0) {
1702 error = dsl_destroy_snapshot_check_impl(
1703 snap, B_FALSE);
1704 }
1705 obj = snap->ds_phys->ds_prev_snap_obj;
1706 dsl_dataset_rele(snap, FTAG);
1707 if (error != 0)
1708 return (error);
1709 }
1710 }
1711 error = dsl_dataset_clone_swap_check_impl(drc->drc_ds,
1712 origin_head, drc->drc_force, drc->drc_owner, tx);
1713 if (error != 0) {
1714 dsl_dataset_rele(origin_head, FTAG);
1715 return (error);
1716 }
1717 error = dsl_dataset_snapshot_check_impl(origin_head,
1718 drc->drc_tosnap, tx, B_TRUE);
1719 dsl_dataset_rele(origin_head, FTAG);
1720 if (error != 0)
1721 return (error);
1722
1723 error = dsl_destroy_head_check_impl(drc->drc_ds, 1);
1724 } else {
1725 error = dsl_dataset_snapshot_check_impl(drc->drc_ds,
1726 drc->drc_tosnap, tx, B_TRUE);
1727 }
1728 return (error);
1729 }
1730
1731 static void
1732 dmu_recv_end_sync(void *arg, dmu_tx_t *tx)
1733 {
1734 dmu_recv_cookie_t *drc = arg;
1735 dsl_pool_t *dp = dmu_tx_pool(tx);
1736
1737 spa_history_log_internal_ds(drc->drc_ds, "finish receiving",
1738 tx, "snap=%s", drc->drc_tosnap);
1739
1740 if (!drc->drc_newfs) {
1741 dsl_dataset_t *origin_head;
1742
1743 VERIFY0(dsl_dataset_hold(dp, drc->drc_tofs, FTAG,
1744 &origin_head));
1745
1746 if (drc->drc_force) {
1747 /*
1748 * Destroy any snapshots of drc_tofs (origin_head)
1749 * after the origin (the snap before drc_ds).
1750 */
1751 uint64_t obj = origin_head->ds_phys->ds_prev_snap_obj;
1752 while (obj != drc->drc_ds->ds_phys->ds_prev_snap_obj) {
1753 dsl_dataset_t *snap;
1754 VERIFY0(dsl_dataset_hold_obj(dp, obj, FTAG,
1755 &snap));
1756 ASSERT3P(snap->ds_dir, ==, origin_head->ds_dir);
1757 obj = snap->ds_phys->ds_prev_snap_obj;
1758 dsl_destroy_snapshot_sync_impl(snap,
1759 B_FALSE, tx);
1760 dsl_dataset_rele(snap, FTAG);
1761 }
1762 }
1763 VERIFY3P(drc->drc_ds->ds_prev, ==,
1764 origin_head->ds_prev);
1765
1766 dsl_dataset_clone_swap_sync_impl(drc->drc_ds,
1767 origin_head, tx);
1768 dsl_dataset_snapshot_sync_impl(origin_head,
1769 drc->drc_tosnap, tx);
1770
1771 /* set snapshot's creation time and guid */
1772 dmu_buf_will_dirty(origin_head->ds_prev->ds_dbuf, tx);
1773 origin_head->ds_prev->ds_phys->ds_creation_time =
1774 drc->drc_drrb->drr_creation_time;
1775 origin_head->ds_prev->ds_phys->ds_guid =
1776 drc->drc_drrb->drr_toguid;
1777 origin_head->ds_prev->ds_phys->ds_flags &=
1778 ~DS_FLAG_INCONSISTENT;
1779
1780 dmu_buf_will_dirty(origin_head->ds_dbuf, tx);
1781 origin_head->ds_phys->ds_flags &= ~DS_FLAG_INCONSISTENT;
1782
1783 dsl_dataset_rele(origin_head, FTAG);
1784 dsl_destroy_head_sync_impl(drc->drc_ds, tx);
1785
1786 if (drc->drc_owner != NULL)
1787 VERIFY3P(origin_head->ds_owner, ==, drc->drc_owner);
1788 } else {
1789 dsl_dataset_t *ds = drc->drc_ds;
1790
1791 dsl_dataset_snapshot_sync_impl(ds, drc->drc_tosnap, tx);
1792
1793 /* set snapshot's creation time and guid */
1794 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx);
1795 ds->ds_prev->ds_phys->ds_creation_time =
1796 drc->drc_drrb->drr_creation_time;
1797 ds->ds_prev->ds_phys->ds_guid = drc->drc_drrb->drr_toguid;
1798 ds->ds_prev->ds_phys->ds_flags &= ~DS_FLAG_INCONSISTENT;
1799
1800 dmu_buf_will_dirty(ds->ds_dbuf, tx);
1801 ds->ds_phys->ds_flags &= ~DS_FLAG_INCONSISTENT;
1802 }
1803 drc->drc_newsnapobj = drc->drc_ds->ds_phys->ds_prev_snap_obj;
1804 /*
1805 * Release the hold from dmu_recv_begin. This must be done before
1806 * we return to open context, so that when we free the dataset's dnode,
1807 * we can evict its bonus buffer.
1808 */
1809 dsl_dataset_disown(drc->drc_ds, dmu_recv_tag);
1810 drc->drc_ds = NULL;
1811 }
1812
1813 static int
1814 add_ds_to_guidmap(const char *name, avl_tree_t *guid_map, uint64_t snapobj)
1815 {
1816 dsl_pool_t *dp;
1817 dsl_dataset_t *snapds;
1818 guid_map_entry_t *gmep;
1819 int err;
1820
1821 ASSERT(guid_map != NULL);
1822
1823 err = dsl_pool_hold(name, FTAG, &dp);
1824 if (err != 0)
1825 return (err);
1826 gmep = kmem_alloc(sizeof (*gmep), KM_SLEEP);
1827 err = dsl_dataset_hold_obj(dp, snapobj, gmep, &snapds);
1828 if (err == 0) {
1829 gmep->guid = snapds->ds_phys->ds_guid;
1830 gmep->gme_ds = snapds;
1831 avl_add(guid_map, gmep);
1832 dsl_dataset_long_hold(snapds, gmep);
1833 } else {
1834 kmem_free(gmep, sizeof (*gmep));
1835 }
1836
1837 dsl_pool_rele(dp, FTAG);
1838 return (err);
1839 }
1840
1841 static int dmu_recv_end_modified_blocks = 3;
1842
1843 static int
1844 dmu_recv_existing_end(dmu_recv_cookie_t *drc)
1845 {
1846 int error;
1847
1848 #ifdef _KERNEL
1849 char *name;
1850
1851 /*
1852 * We will be destroying the ds; make sure its origin is unmounted if
1853 * necessary.
1854 */
1855 name = kmem_alloc(MAXNAMELEN, KM_SLEEP);
1856 dsl_dataset_name(drc->drc_ds, name);
1857 zfs_destroy_unmount_origin(name);
1858 kmem_free(name, MAXNAMELEN);
1859 #endif
1860
1861 error = dsl_sync_task(drc->drc_tofs,
1862 dmu_recv_end_check, dmu_recv_end_sync, drc,
1863 dmu_recv_end_modified_blocks);
1864
1865 if (error != 0)
1866 dmu_recv_cleanup_ds(drc);
1867 return (error);
1868 }
1869
1870 static int
1871 dmu_recv_new_end(dmu_recv_cookie_t *drc)
1872 {
1873 int error;
1874
1875 error = dsl_sync_task(drc->drc_tofs,
1876 dmu_recv_end_check, dmu_recv_end_sync, drc,
1877 dmu_recv_end_modified_blocks);
1878
1879 if (error != 0) {
1880 dmu_recv_cleanup_ds(drc);
1881 } else if (drc->drc_guid_to_ds_map != NULL) {
1882 (void) add_ds_to_guidmap(drc->drc_tofs,
1883 drc->drc_guid_to_ds_map,
1884 drc->drc_newsnapobj);
1885 }
1886 return (error);
1887 }
1888
1889 int
1890 dmu_recv_end(dmu_recv_cookie_t *drc, void *owner)
1891 {
1892 drc->drc_owner = owner;
1893
1894 if (drc->drc_newfs)
1895 return (dmu_recv_new_end(drc));
1896 else
1897 return (dmu_recv_existing_end(drc));
1898 }
1899
1900 /*
1901 * Return TRUE if this objset is currently being received into.
1902 */
1903 boolean_t
1904 dmu_objset_is_receiving(objset_t *os)
1905 {
1906 return (os->os_dsl_dataset != NULL &&
1907 os->os_dsl_dataset->ds_owner == dmu_recv_tag);
1908 }
1909
1910 #if defined(_KERNEL)
1911 module_param(zfs_send_corrupt_data, int, 0644);
1912 MODULE_PARM_DESC(zfs_send_corrupt_data, "Allow sending corrupt data");
1913 #endif
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