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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) 2014, Joyent, Inc. All rights reserved.
26 * Copyright (c) 2011, 2014 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/blkptr.h>
54 #include <sys/dsl_bookmark.h>
55 #include <sys/zfeature.h>
56
57 /* Set this tunable to TRUE to replace corrupt data with 0x2f5baddb10c */
58 int zfs_send_corrupt_data = B_FALSE;
59
60 static char *dmu_recv_tag = "dmu_recv_tag";
61 static const char *recv_clone_name = "%recv";
62
63 typedef struct dump_bytes_io {
64 dmu_sendarg_t *dbi_dsp;
65 void *dbi_buf;
66 int dbi_len;
67 } dump_bytes_io_t;
68
69 static void
70 dump_bytes_strategy(void *arg)
71 {
72 dump_bytes_io_t *dbi = (dump_bytes_io_t *)arg;
73 dmu_sendarg_t *dsp = dbi->dbi_dsp;
74 dsl_dataset_t *ds = dsp->dsa_os->os_dsl_dataset;
75 ssize_t resid; /* have to get resid to get detailed errno */
76 ASSERT0(dbi->dbi_len % 8);
77
78 fletcher_4_incremental_native(dbi->dbi_buf, dbi->dbi_len, &dsp->dsa_zc);
79 dsp->dsa_err = vn_rdwr(UIO_WRITE, dsp->dsa_vp,
80 (caddr_t)dbi->dbi_buf, dbi->dbi_len,
81 0, UIO_SYSSPACE, FAPPEND, RLIM64_INFINITY, CRED(), &resid);
82
83 mutex_enter(&ds->ds_sendstream_lock);
84 *dsp->dsa_off += dbi->dbi_len;
85 mutex_exit(&ds->ds_sendstream_lock);
86 }
87
88 static int
89 dump_bytes(dmu_sendarg_t *dsp, void *buf, int len)
90 {
91 dump_bytes_io_t dbi;
92
93 dbi.dbi_dsp = dsp;
94 dbi.dbi_buf = buf;
95 dbi.dbi_len = len;
96
97 /*
98 * The vn_rdwr() call is performed in a taskq to ensure that there is
99 * always enough stack space to write safely to the target filesystem.
100 * The ZIO_TYPE_FREE threads are used because there can be a lot of
101 * them and they are used in vdev_file.c for a similar purpose.
102 */
103 spa_taskq_dispatch_sync(dmu_objset_spa(dsp->dsa_os), ZIO_TYPE_FREE,
104 ZIO_TASKQ_ISSUE, dump_bytes_strategy, &dbi, TQ_SLEEP);
105
106 return (dsp->dsa_err);
107 }
108
109 static int
110 dump_free(dmu_sendarg_t *dsp, uint64_t object, uint64_t offset,
111 uint64_t length)
112 {
113 struct drr_free *drrf = &(dsp->dsa_drr->drr_u.drr_free);
114
115 /*
116 * When we receive a free record, dbuf_free_range() assumes
117 * that the receiving system doesn't have any dbufs in the range
118 * being freed. This is always true because there is a one-record
119 * constraint: we only send one WRITE record for any given
120 * object+offset. We know that the one-record constraint is
121 * true because we always send data in increasing order by
122 * object,offset.
123 *
124 * If the increasing-order constraint ever changes, we should find
125 * another way to assert that the one-record constraint is still
126 * satisfied.
127 */
128 ASSERT(object > dsp->dsa_last_data_object ||
129 (object == dsp->dsa_last_data_object &&
130 offset > dsp->dsa_last_data_offset));
131
132 /*
133 * If we are doing a non-incremental send, then there can't
134 * be any data in the dataset we're receiving into. Therefore
135 * a free record would simply be a no-op. Save space by not
136 * sending it to begin with.
137 */
138 if (!dsp->dsa_incremental)
139 return (0);
140
141 if (length != -1ULL && offset + length < offset)
142 length = -1ULL;
143
144 /*
145 * If there is a pending op, but it's not PENDING_FREE, push it out,
146 * since free block aggregation can only be done for blocks of the
147 * same type (i.e., DRR_FREE records can only be aggregated with
148 * other DRR_FREE records. DRR_FREEOBJECTS records can only be
149 * aggregated with other DRR_FREEOBJECTS records.
150 */
151 if (dsp->dsa_pending_op != PENDING_NONE &&
152 dsp->dsa_pending_op != PENDING_FREE) {
153 if (dump_bytes(dsp, dsp->dsa_drr,
154 sizeof (dmu_replay_record_t)) != 0)
155 return (SET_ERROR(EINTR));
156 dsp->dsa_pending_op = PENDING_NONE;
157 }
158
159 if (dsp->dsa_pending_op == PENDING_FREE) {
160 /*
161 * There should never be a PENDING_FREE if length is -1
162 * (because dump_dnode is the only place where this
163 * function is called with a -1, and only after flushing
164 * any pending record).
165 */
166 ASSERT(length != -1ULL);
167 /*
168 * Check to see whether this free block can be aggregated
169 * with pending one.
170 */
171 if (drrf->drr_object == object && drrf->drr_offset +
172 drrf->drr_length == offset) {
173 drrf->drr_length += length;
174 return (0);
175 } else {
176 /* not a continuation. Push out pending record */
177 if (dump_bytes(dsp, dsp->dsa_drr,
178 sizeof (dmu_replay_record_t)) != 0)
179 return (SET_ERROR(EINTR));
180 dsp->dsa_pending_op = PENDING_NONE;
181 }
182 }
183 /* create a FREE record and make it pending */
184 bzero(dsp->dsa_drr, sizeof (dmu_replay_record_t));
185 dsp->dsa_drr->drr_type = DRR_FREE;
186 drrf->drr_object = object;
187 drrf->drr_offset = offset;
188 drrf->drr_length = length;
189 drrf->drr_toguid = dsp->dsa_toguid;
190 if (length == -1ULL) {
191 if (dump_bytes(dsp, dsp->dsa_drr,
192 sizeof (dmu_replay_record_t)) != 0)
193 return (SET_ERROR(EINTR));
194 } else {
195 dsp->dsa_pending_op = PENDING_FREE;
196 }
197
198 return (0);
199 }
200
201 static int
202 dump_write(dmu_sendarg_t *dsp, dmu_object_type_t type,
203 uint64_t object, uint64_t offset, int blksz, const blkptr_t *bp, void *data)
204 {
205 struct drr_write *drrw = &(dsp->dsa_drr->drr_u.drr_write);
206
207 /*
208 * We send data in increasing object, offset order.
209 * See comment in dump_free() for details.
210 */
211 ASSERT(object > dsp->dsa_last_data_object ||
212 (object == dsp->dsa_last_data_object &&
213 offset > dsp->dsa_last_data_offset));
214 dsp->dsa_last_data_object = object;
215 dsp->dsa_last_data_offset = offset + blksz - 1;
216
217 /*
218 * If there is any kind of pending aggregation (currently either
219 * a grouping of free objects or free blocks), push it out to
220 * the stream, since aggregation can't be done across operations
221 * of different types.
222 */
223 if (dsp->dsa_pending_op != PENDING_NONE) {
224 if (dump_bytes(dsp, dsp->dsa_drr,
225 sizeof (dmu_replay_record_t)) != 0)
226 return (SET_ERROR(EINTR));
227 dsp->dsa_pending_op = PENDING_NONE;
228 }
229 /* write a DATA record */
230 bzero(dsp->dsa_drr, sizeof (dmu_replay_record_t));
231 dsp->dsa_drr->drr_type = DRR_WRITE;
232 drrw->drr_object = object;
233 drrw->drr_type = type;
234 drrw->drr_offset = offset;
235 drrw->drr_length = blksz;
236 drrw->drr_toguid = dsp->dsa_toguid;
237 if (BP_IS_EMBEDDED(bp)) {
238 /*
239 * There's no pre-computed checksum of embedded BP's, so
240 * (like fletcher4-checkummed blocks) userland will have
241 * to compute a dedup-capable checksum itself.
242 */
243 drrw->drr_checksumtype = ZIO_CHECKSUM_OFF;
244 } else {
245 drrw->drr_checksumtype = BP_GET_CHECKSUM(bp);
246 if (zio_checksum_table[drrw->drr_checksumtype].ci_dedup)
247 drrw->drr_checksumflags |= DRR_CHECKSUM_DEDUP;
248 DDK_SET_LSIZE(&drrw->drr_key, BP_GET_LSIZE(bp));
249 DDK_SET_PSIZE(&drrw->drr_key, BP_GET_PSIZE(bp));
250 DDK_SET_COMPRESS(&drrw->drr_key, BP_GET_COMPRESS(bp));
251 drrw->drr_key.ddk_cksum = bp->blk_cksum;
252 }
253
254 if (dump_bytes(dsp, dsp->dsa_drr, sizeof (dmu_replay_record_t)) != 0)
255 return (SET_ERROR(EINTR));
256 if (dump_bytes(dsp, data, blksz) != 0)
257 return (SET_ERROR(EINTR));
258 return (0);
259 }
260
261 static int
262 dump_write_embedded(dmu_sendarg_t *dsp, uint64_t object, uint64_t offset,
263 int blksz, const blkptr_t *bp)
264 {
265 char buf[BPE_PAYLOAD_SIZE];
266 struct drr_write_embedded *drrw =
267 &(dsp->dsa_drr->drr_u.drr_write_embedded);
268
269 if (dsp->dsa_pending_op != PENDING_NONE) {
270 if (dump_bytes(dsp, dsp->dsa_drr,
271 sizeof (dmu_replay_record_t)) != 0)
272 return (EINTR);
273 dsp->dsa_pending_op = PENDING_NONE;
274 }
275
276 ASSERT(BP_IS_EMBEDDED(bp));
277
278 bzero(dsp->dsa_drr, sizeof (dmu_replay_record_t));
279 dsp->dsa_drr->drr_type = DRR_WRITE_EMBEDDED;
280 drrw->drr_object = object;
281 drrw->drr_offset = offset;
282 drrw->drr_length = blksz;
283 drrw->drr_toguid = dsp->dsa_toguid;
284 drrw->drr_compression = BP_GET_COMPRESS(bp);
285 drrw->drr_etype = BPE_GET_ETYPE(bp);
286 drrw->drr_lsize = BPE_GET_LSIZE(bp);
287 drrw->drr_psize = BPE_GET_PSIZE(bp);
288
289 decode_embedded_bp_compressed(bp, buf);
290
291 if (dump_bytes(dsp, dsp->dsa_drr, sizeof (dmu_replay_record_t)) != 0)
292 return (EINTR);
293 if (dump_bytes(dsp, buf, P2ROUNDUP(drrw->drr_psize, 8)) != 0)
294 return (EINTR);
295 return (0);
296 }
297
298 static int
299 dump_spill(dmu_sendarg_t *dsp, uint64_t object, int blksz, void *data)
300 {
301 struct drr_spill *drrs = &(dsp->dsa_drr->drr_u.drr_spill);
302
303 if (dsp->dsa_pending_op != PENDING_NONE) {
304 if (dump_bytes(dsp, dsp->dsa_drr,
305 sizeof (dmu_replay_record_t)) != 0)
306 return (SET_ERROR(EINTR));
307 dsp->dsa_pending_op = PENDING_NONE;
308 }
309
310 /* write a SPILL record */
311 bzero(dsp->dsa_drr, sizeof (dmu_replay_record_t));
312 dsp->dsa_drr->drr_type = DRR_SPILL;
313 drrs->drr_object = object;
314 drrs->drr_length = blksz;
315 drrs->drr_toguid = dsp->dsa_toguid;
316
317 if (dump_bytes(dsp, dsp->dsa_drr, sizeof (dmu_replay_record_t)))
318 return (SET_ERROR(EINTR));
319 if (dump_bytes(dsp, data, blksz))
320 return (SET_ERROR(EINTR));
321 return (0);
322 }
323
324 static int
325 dump_freeobjects(dmu_sendarg_t *dsp, uint64_t firstobj, uint64_t numobjs)
326 {
327 struct drr_freeobjects *drrfo = &(dsp->dsa_drr->drr_u.drr_freeobjects);
328
329 /* See comment in dump_free(). */
330 if (!dsp->dsa_incremental)
331 return (0);
332
333 /*
334 * If there is a pending op, but it's not PENDING_FREEOBJECTS,
335 * push it out, since free block aggregation can only be done for
336 * blocks of the same type (i.e., DRR_FREE records can only be
337 * aggregated with other DRR_FREE records. DRR_FREEOBJECTS records
338 * can only be aggregated with other DRR_FREEOBJECTS records.
339 */
340 if (dsp->dsa_pending_op != PENDING_NONE &&
341 dsp->dsa_pending_op != PENDING_FREEOBJECTS) {
342 if (dump_bytes(dsp, dsp->dsa_drr,
343 sizeof (dmu_replay_record_t)) != 0)
344 return (SET_ERROR(EINTR));
345 dsp->dsa_pending_op = PENDING_NONE;
346 }
347 if (dsp->dsa_pending_op == PENDING_FREEOBJECTS) {
348 /*
349 * See whether this free object array can be aggregated
350 * with pending one
351 */
352 if (drrfo->drr_firstobj + drrfo->drr_numobjs == firstobj) {
353 drrfo->drr_numobjs += numobjs;
354 return (0);
355 } else {
356 /* can't be aggregated. Push out pending record */
357 if (dump_bytes(dsp, dsp->dsa_drr,
358 sizeof (dmu_replay_record_t)) != 0)
359 return (SET_ERROR(EINTR));
360 dsp->dsa_pending_op = PENDING_NONE;
361 }
362 }
363
364 /* write a FREEOBJECTS record */
365 bzero(dsp->dsa_drr, sizeof (dmu_replay_record_t));
366 dsp->dsa_drr->drr_type = DRR_FREEOBJECTS;
367 drrfo->drr_firstobj = firstobj;
368 drrfo->drr_numobjs = numobjs;
369 drrfo->drr_toguid = dsp->dsa_toguid;
370
371 dsp->dsa_pending_op = PENDING_FREEOBJECTS;
372
373 return (0);
374 }
375
376 static int
377 dump_dnode(dmu_sendarg_t *dsp, uint64_t object, dnode_phys_t *dnp)
378 {
379 struct drr_object *drro = &(dsp->dsa_drr->drr_u.drr_object);
380
381 if (dnp == NULL || dnp->dn_type == DMU_OT_NONE)
382 return (dump_freeobjects(dsp, object, 1));
383
384 if (dsp->dsa_pending_op != PENDING_NONE) {
385 if (dump_bytes(dsp, dsp->dsa_drr,
386 sizeof (dmu_replay_record_t)) != 0)
387 return (SET_ERROR(EINTR));
388 dsp->dsa_pending_op = PENDING_NONE;
389 }
390
391 /* write an OBJECT record */
392 bzero(dsp->dsa_drr, sizeof (dmu_replay_record_t));
393 dsp->dsa_drr->drr_type = DRR_OBJECT;
394 drro->drr_object = object;
395 drro->drr_type = dnp->dn_type;
396 drro->drr_bonustype = dnp->dn_bonustype;
397 drro->drr_blksz = dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT;
398 drro->drr_bonuslen = dnp->dn_bonuslen;
399 drro->drr_checksumtype = dnp->dn_checksum;
400 drro->drr_compress = dnp->dn_compress;
401 drro->drr_toguid = dsp->dsa_toguid;
402
403 if (dump_bytes(dsp, dsp->dsa_drr, sizeof (dmu_replay_record_t)) != 0)
404 return (SET_ERROR(EINTR));
405
406 if (dump_bytes(dsp, DN_BONUS(dnp), P2ROUNDUP(dnp->dn_bonuslen, 8)) != 0)
407 return (SET_ERROR(EINTR));
408
409 /* Free anything past the end of the file. */
410 if (dump_free(dsp, object, (dnp->dn_maxblkid + 1) *
411 (dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT), -1ULL) != 0)
412 return (SET_ERROR(EINTR));
413 if (dsp->dsa_err != 0)
414 return (SET_ERROR(EINTR));
415 return (0);
416 }
417
418 static boolean_t
419 backup_do_embed(dmu_sendarg_t *dsp, const blkptr_t *bp)
420 {
421 if (!BP_IS_EMBEDDED(bp))
422 return (B_FALSE);
423
424 /*
425 * Compression function must be legacy, or explicitly enabled.
426 */
427 if ((BP_GET_COMPRESS(bp) >= ZIO_COMPRESS_LEGACY_FUNCTIONS &&
428 !(dsp->dsa_featureflags & DMU_BACKUP_FEATURE_EMBED_DATA_LZ4)))
429 return (B_FALSE);
430
431 /*
432 * Embed type must be explicitly enabled.
433 */
434 switch (BPE_GET_ETYPE(bp)) {
435 case BP_EMBEDDED_TYPE_DATA:
436 if (dsp->dsa_featureflags & DMU_BACKUP_FEATURE_EMBED_DATA)
437 return (B_TRUE);
438 break;
439 default:
440 return (B_FALSE);
441 }
442 return (B_FALSE);
443 }
444
445 #define BP_SPAN(dnp, level) \
446 (((uint64_t)dnp->dn_datablkszsec) << (SPA_MINBLOCKSHIFT + \
447 (level) * (dnp->dn_indblkshift - SPA_BLKPTRSHIFT)))
448
449 /* ARGSUSED */
450 static int
451 backup_cb(spa_t *spa, zilog_t *zilog, const blkptr_t *bp,
452 const zbookmark_phys_t *zb, const dnode_phys_t *dnp, void *arg)
453 {
454 dmu_sendarg_t *dsp = arg;
455 dmu_object_type_t type = bp ? BP_GET_TYPE(bp) : DMU_OT_NONE;
456 int err = 0;
457
458 if (issig(JUSTLOOKING) && issig(FORREAL))
459 return (SET_ERROR(EINTR));
460
461 if (zb->zb_object != DMU_META_DNODE_OBJECT &&
462 DMU_OBJECT_IS_SPECIAL(zb->zb_object)) {
463 return (0);
464 } else if (zb->zb_level == ZB_ZIL_LEVEL) {
465 /*
466 * If we are sending a non-snapshot (which is allowed on
467 * read-only pools), it may have a ZIL, which must be ignored.
468 */
469 return (0);
470 } else if (BP_IS_HOLE(bp) &&
471 zb->zb_object == DMU_META_DNODE_OBJECT) {
472 uint64_t span = BP_SPAN(dnp, zb->zb_level);
473 uint64_t dnobj = (zb->zb_blkid * span) >> DNODE_SHIFT;
474 err = dump_freeobjects(dsp, dnobj, span >> DNODE_SHIFT);
475 } else if (BP_IS_HOLE(bp)) {
476 uint64_t span = BP_SPAN(dnp, zb->zb_level);
477 err = dump_free(dsp, zb->zb_object, zb->zb_blkid * span, span);
478 } else if (zb->zb_level > 0 || type == DMU_OT_OBJSET) {
479 return (0);
480 } else if (type == DMU_OT_DNODE) {
481 dnode_phys_t *blk;
482 int i;
483 int blksz = BP_GET_LSIZE(bp);
484 uint32_t aflags = ARC_WAIT;
485 arc_buf_t *abuf;
486
487 if (arc_read(NULL, spa, bp, arc_getbuf_func, &abuf,
488 ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL,
489 &aflags, zb) != 0)
490 return (SET_ERROR(EIO));
491
492 blk = abuf->b_data;
493 for (i = 0; i < blksz >> DNODE_SHIFT; i++) {
494 uint64_t dnobj = (zb->zb_blkid <<
495 (DNODE_BLOCK_SHIFT - DNODE_SHIFT)) + i;
496 err = dump_dnode(dsp, dnobj, blk+i);
497 if (err != 0)
498 break;
499 }
500 (void) arc_buf_remove_ref(abuf, &abuf);
501 } else if (type == DMU_OT_SA) {
502 uint32_t aflags = ARC_WAIT;
503 arc_buf_t *abuf;
504 int blksz = BP_GET_LSIZE(bp);
505
506 if (arc_read(NULL, spa, bp, arc_getbuf_func, &abuf,
507 ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL,
508 &aflags, zb) != 0)
509 return (SET_ERROR(EIO));
510
511 err = dump_spill(dsp, zb->zb_object, blksz, abuf->b_data);
512 (void) arc_buf_remove_ref(abuf, &abuf);
513 } else if (backup_do_embed(dsp, bp)) {
514 /* it's an embedded level-0 block of a regular object */
515 int blksz = dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT;
516 err = dump_write_embedded(dsp, zb->zb_object,
517 zb->zb_blkid * blksz, blksz, bp);
518 } else { /* it's a level-0 block of a regular object */
519 uint32_t aflags = ARC_WAIT;
520 arc_buf_t *abuf;
521 int blksz = BP_GET_LSIZE(bp);
522
523 ASSERT3U(blksz, ==, dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT);
524 ASSERT0(zb->zb_level);
525 if (arc_read(NULL, spa, bp, arc_getbuf_func, &abuf,
526 ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL,
527 &aflags, zb) != 0) {
528 if (zfs_send_corrupt_data) {
529 uint64_t *ptr;
530 /* Send a block filled with 0x"zfs badd bloc" */
531 abuf = arc_buf_alloc(spa, blksz, &abuf,
532 ARC_BUFC_DATA);
533 for (ptr = abuf->b_data;
534 (char *)ptr < (char *)abuf->b_data + blksz;
535 ptr++)
536 *ptr = 0x2f5baddb10cULL;
537 } else {
538 return (SET_ERROR(EIO));
539 }
540 }
541
542 err = dump_write(dsp, type, zb->zb_object, zb->zb_blkid * blksz,
543 blksz, bp, abuf->b_data);
544 (void) arc_buf_remove_ref(abuf, &abuf);
545 }
546
547 ASSERT(err == 0 || err == EINTR);
548 return (err);
549 }
550
551 /*
552 * Releases dp using the specified tag.
553 */
554 static int
555 dmu_send_impl(void *tag, dsl_pool_t *dp, dsl_dataset_t *ds,
556 zfs_bookmark_phys_t *fromzb, boolean_t is_clone, boolean_t embedok,
557 int outfd, vnode_t *vp, offset_t *off)
558 {
559 objset_t *os;
560 dmu_replay_record_t *drr;
561 dmu_sendarg_t *dsp;
562 int err;
563 uint64_t fromtxg = 0;
564 uint64_t featureflags = 0;
565
566 err = dmu_objset_from_ds(ds, &os);
567 if (err != 0) {
568 dsl_pool_rele(dp, tag);
569 return (err);
570 }
571
572 drr = kmem_zalloc(sizeof (dmu_replay_record_t), KM_SLEEP);
573 drr->drr_type = DRR_BEGIN;
574 drr->drr_u.drr_begin.drr_magic = DMU_BACKUP_MAGIC;
575 DMU_SET_STREAM_HDRTYPE(drr->drr_u.drr_begin.drr_versioninfo,
576 DMU_SUBSTREAM);
577
578 #ifdef _KERNEL
579 if (dmu_objset_type(os) == DMU_OST_ZFS) {
580 uint64_t version;
581 if (zfs_get_zplprop(os, ZFS_PROP_VERSION, &version) != 0) {
582 kmem_free(drr, sizeof (dmu_replay_record_t));
583 dsl_pool_rele(dp, tag);
584 return (SET_ERROR(EINVAL));
585 }
586 if (version >= ZPL_VERSION_SA) {
587 featureflags |= DMU_BACKUP_FEATURE_SA_SPILL;
588 }
589 }
590 #endif
591
592 if (embedok &&
593 spa_feature_is_active(dp->dp_spa, SPA_FEATURE_EMBEDDED_DATA)) {
594 featureflags |= DMU_BACKUP_FEATURE_EMBED_DATA;
595 if (spa_feature_is_active(dp->dp_spa, SPA_FEATURE_LZ4_COMPRESS))
596 featureflags |= DMU_BACKUP_FEATURE_EMBED_DATA_LZ4;
597 } else {
598 embedok = B_FALSE;
599 }
600
601 DMU_SET_FEATUREFLAGS(drr->drr_u.drr_begin.drr_versioninfo,
602 featureflags);
603
604 drr->drr_u.drr_begin.drr_creation_time =
605 dsl_dataset_phys(ds)->ds_creation_time;
606 drr->drr_u.drr_begin.drr_type = dmu_objset_type(os);
607 if (is_clone)
608 drr->drr_u.drr_begin.drr_flags |= DRR_FLAG_CLONE;
609 drr->drr_u.drr_begin.drr_toguid = dsl_dataset_phys(ds)->ds_guid;
610 if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET)
611 drr->drr_u.drr_begin.drr_flags |= DRR_FLAG_CI_DATA;
612
613 if (fromzb != NULL) {
614 drr->drr_u.drr_begin.drr_fromguid = fromzb->zbm_guid;
615 fromtxg = fromzb->zbm_creation_txg;
616 }
617 dsl_dataset_name(ds, drr->drr_u.drr_begin.drr_toname);
618 if (!ds->ds_is_snapshot) {
619 (void) strlcat(drr->drr_u.drr_begin.drr_toname, "@--head--",
620 sizeof (drr->drr_u.drr_begin.drr_toname));
621 }
622
623 dsp = kmem_zalloc(sizeof (dmu_sendarg_t), KM_SLEEP);
624
625 dsp->dsa_drr = drr;
626 dsp->dsa_vp = vp;
627 dsp->dsa_outfd = outfd;
628 dsp->dsa_proc = curproc;
629 dsp->dsa_os = os;
630 dsp->dsa_off = off;
631 dsp->dsa_toguid = dsl_dataset_phys(ds)->ds_guid;
632 ZIO_SET_CHECKSUM(&dsp->dsa_zc, 0, 0, 0, 0);
633 dsp->dsa_pending_op = PENDING_NONE;
634 dsp->dsa_incremental = (fromzb != NULL);
635 dsp->dsa_featureflags = featureflags;
636
637 mutex_enter(&ds->ds_sendstream_lock);
638 list_insert_head(&ds->ds_sendstreams, dsp);
639 mutex_exit(&ds->ds_sendstream_lock);
640
641 dsl_dataset_long_hold(ds, FTAG);
642 dsl_pool_rele(dp, tag);
643
644 if (dump_bytes(dsp, drr, sizeof (dmu_replay_record_t)) != 0) {
645 err = dsp->dsa_err;
646 goto out;
647 }
648
649 err = traverse_dataset(ds, fromtxg, TRAVERSE_PRE | TRAVERSE_PREFETCH,
650 backup_cb, dsp);
651
652 if (dsp->dsa_pending_op != PENDING_NONE)
653 if (dump_bytes(dsp, drr, sizeof (dmu_replay_record_t)) != 0)
654 err = SET_ERROR(EINTR);
655
656 if (err != 0) {
657 if (err == EINTR && dsp->dsa_err != 0)
658 err = dsp->dsa_err;
659 goto out;
660 }
661
662 bzero(drr, sizeof (dmu_replay_record_t));
663 drr->drr_type = DRR_END;
664 drr->drr_u.drr_end.drr_checksum = dsp->dsa_zc;
665 drr->drr_u.drr_end.drr_toguid = dsp->dsa_toguid;
666
667 if (dump_bytes(dsp, drr, sizeof (dmu_replay_record_t)) != 0) {
668 err = dsp->dsa_err;
669 goto out;
670 }
671
672 out:
673 mutex_enter(&ds->ds_sendstream_lock);
674 list_remove(&ds->ds_sendstreams, dsp);
675 mutex_exit(&ds->ds_sendstream_lock);
676
677 kmem_free(drr, sizeof (dmu_replay_record_t));
678 kmem_free(dsp, sizeof (dmu_sendarg_t));
679
680 dsl_dataset_long_rele(ds, FTAG);
681
682 return (err);
683 }
684
685 int
686 dmu_send_obj(const char *pool, uint64_t tosnap, uint64_t fromsnap,
687 boolean_t embedok, int outfd, vnode_t *vp, offset_t *off)
688 {
689 dsl_pool_t *dp;
690 dsl_dataset_t *ds;
691 dsl_dataset_t *fromds = NULL;
692 int err;
693
694 err = dsl_pool_hold(pool, FTAG, &dp);
695 if (err != 0)
696 return (err);
697
698 err = dsl_dataset_hold_obj(dp, tosnap, FTAG, &ds);
699 if (err != 0) {
700 dsl_pool_rele(dp, FTAG);
701 return (err);
702 }
703
704 if (fromsnap != 0) {
705 zfs_bookmark_phys_t zb;
706 boolean_t is_clone;
707
708 err = dsl_dataset_hold_obj(dp, fromsnap, FTAG, &fromds);
709 if (err != 0) {
710 dsl_dataset_rele(ds, FTAG);
711 dsl_pool_rele(dp, FTAG);
712 return (err);
713 }
714 if (!dsl_dataset_is_before(ds, fromds, 0))
715 err = SET_ERROR(EXDEV);
716 zb.zbm_creation_time =
717 dsl_dataset_phys(fromds)->ds_creation_time;
718 zb.zbm_creation_txg = dsl_dataset_phys(fromds)->ds_creation_txg;
719 zb.zbm_guid = dsl_dataset_phys(fromds)->ds_guid;
720 is_clone = (fromds->ds_dir != ds->ds_dir);
721 dsl_dataset_rele(fromds, FTAG);
722 err = dmu_send_impl(FTAG, dp, ds, &zb, is_clone, embedok,
723 outfd, vp, off);
724 } else {
725 err = dmu_send_impl(FTAG, dp, ds, NULL, B_FALSE, embedok,
726 outfd, vp, off);
727 }
728 dsl_dataset_rele(ds, FTAG);
729 return (err);
730 }
731
732 int
733 dmu_send(const char *tosnap, const char *fromsnap, boolean_t embedok,
734 int outfd, vnode_t *vp, offset_t *off)
735 {
736 dsl_pool_t *dp;
737 dsl_dataset_t *ds;
738 int err;
739 boolean_t owned = B_FALSE;
740
741 if (fromsnap != NULL && strpbrk(fromsnap, "@#") == NULL)
742 return (SET_ERROR(EINVAL));
743
744 err = dsl_pool_hold(tosnap, FTAG, &dp);
745 if (err != 0)
746 return (err);
747
748 if (strchr(tosnap, '@') == NULL && spa_writeable(dp->dp_spa)) {
749 /*
750 * We are sending a filesystem or volume. Ensure
751 * that it doesn't change by owning the dataset.
752 */
753 err = dsl_dataset_own(dp, tosnap, FTAG, &ds);
754 owned = B_TRUE;
755 } else {
756 err = dsl_dataset_hold(dp, tosnap, FTAG, &ds);
757 }
758 if (err != 0) {
759 dsl_pool_rele(dp, FTAG);
760 return (err);
761 }
762
763 if (fromsnap != NULL) {
764 zfs_bookmark_phys_t zb;
765 boolean_t is_clone = B_FALSE;
766 int fsnamelen = strchr(tosnap, '@') - tosnap;
767
768 /*
769 * If the fromsnap is in a different filesystem, then
770 * mark the send stream as a clone.
771 */
772 if (strncmp(tosnap, fromsnap, fsnamelen) != 0 ||
773 (fromsnap[fsnamelen] != '@' &&
774 fromsnap[fsnamelen] != '#')) {
775 is_clone = B_TRUE;
776 }
777
778 if (strchr(fromsnap, '@')) {
779 dsl_dataset_t *fromds;
780 err = dsl_dataset_hold(dp, fromsnap, FTAG, &fromds);
781 if (err == 0) {
782 if (!dsl_dataset_is_before(ds, fromds, 0))
783 err = SET_ERROR(EXDEV);
784 zb.zbm_creation_time =
785 dsl_dataset_phys(fromds)->ds_creation_time;
786 zb.zbm_creation_txg =
787 dsl_dataset_phys(fromds)->ds_creation_txg;
788 zb.zbm_guid = dsl_dataset_phys(fromds)->ds_guid;
789 is_clone = (ds->ds_dir != fromds->ds_dir);
790 dsl_dataset_rele(fromds, FTAG);
791 }
792 } else {
793 err = dsl_bookmark_lookup(dp, fromsnap, ds, &zb);
794 }
795 if (err != 0) {
796 dsl_dataset_rele(ds, FTAG);
797 dsl_pool_rele(dp, FTAG);
798 return (err);
799 }
800 err = dmu_send_impl(FTAG, dp, ds, &zb, is_clone, embedok,
801 outfd, vp, off);
802 } else {
803 err = dmu_send_impl(FTAG, dp, ds, NULL, B_FALSE, embedok,
804 outfd, vp, off);
805 }
806 if (owned)
807 dsl_dataset_disown(ds, FTAG);
808 else
809 dsl_dataset_rele(ds, FTAG);
810 return (err);
811 }
812
813 int
814 dmu_send_estimate(dsl_dataset_t *ds, dsl_dataset_t *fromds, uint64_t *sizep)
815 {
816 int err;
817 uint64_t size, recordsize;
818 ASSERTV(dsl_pool_t *dp = ds->ds_dir->dd_pool);
819
820 ASSERT(dsl_pool_config_held(dp));
821
822 /* tosnap must be a snapshot */
823 if (!ds->ds_is_snapshot)
824 return (SET_ERROR(EINVAL));
825
826 /*
827 * fromsnap must be an earlier snapshot from the same fs as tosnap,
828 * or the origin's fs.
829 */
830 if (fromds != NULL && !dsl_dataset_is_before(ds, fromds, 0))
831 return (SET_ERROR(EXDEV));
832
833 /* Get uncompressed size estimate of changed data. */
834 if (fromds == NULL) {
835 size = dsl_dataset_phys(ds)->ds_uncompressed_bytes;
836 } else {
837 uint64_t used, comp;
838 err = dsl_dataset_space_written(fromds, ds,
839 &used, &comp, &size);
840 if (err != 0)
841 return (err);
842 }
843
844 /*
845 * Assume that space (both on-disk and in-stream) is dominated by
846 * data. We will adjust for indirect blocks and the copies property,
847 * but ignore per-object space used (eg, dnodes and DRR_OBJECT records).
848 */
849
850 /*
851 * Subtract out approximate space used by indirect blocks.
852 * Assume most space is used by data blocks (non-indirect, non-dnode).
853 * Assume all blocks are recordsize. Assume ditto blocks and
854 * internal fragmentation counter out compression.
855 *
856 * Therefore, space used by indirect blocks is sizeof(blkptr_t) per
857 * block, which we observe in practice.
858 */
859 err = dsl_prop_get_int_ds(ds, "recordsize", &recordsize);
860 if (err != 0)
861 return (err);
862 size -= size / recordsize * sizeof (blkptr_t);
863
864 /* Add in the space for the record associated with each block. */
865 size += size / recordsize * sizeof (dmu_replay_record_t);
866
867 *sizep = size;
868
869 return (0);
870 }
871
872 typedef struct dmu_recv_begin_arg {
873 const char *drba_origin;
874 dmu_recv_cookie_t *drba_cookie;
875 cred_t *drba_cred;
876 uint64_t drba_snapobj;
877 } dmu_recv_begin_arg_t;
878
879 static int
880 recv_begin_check_existing_impl(dmu_recv_begin_arg_t *drba, dsl_dataset_t *ds,
881 uint64_t fromguid)
882 {
883 uint64_t val;
884 int error;
885 dsl_pool_t *dp = ds->ds_dir->dd_pool;
886
887 /* temporary clone name must not exist */
888 error = zap_lookup(dp->dp_meta_objset,
889 dsl_dir_phys(ds->ds_dir)->dd_child_dir_zapobj, recv_clone_name,
890 8, 1, &val);
891 if (error != ENOENT)
892 return (error == 0 ? EBUSY : error);
893
894 /* new snapshot name must not exist */
895 error = zap_lookup(dp->dp_meta_objset,
896 dsl_dataset_phys(ds)->ds_snapnames_zapobj,
897 drba->drba_cookie->drc_tosnap, 8, 1, &val);
898 if (error != ENOENT)
899 return (error == 0 ? EEXIST : error);
900
901 /*
902 * Check snapshot limit before receiving. We'll recheck again at the
903 * end, but might as well abort before receiving if we're already over
904 * the limit.
905 *
906 * Note that we do not check the file system limit with
907 * dsl_dir_fscount_check because the temporary %clones don't count
908 * against that limit.
909 */
910 error = dsl_fs_ss_limit_check(ds->ds_dir, 1, ZFS_PROP_SNAPSHOT_LIMIT,
911 NULL, drba->drba_cred);
912 if (error != 0)
913 return (error);
914
915 if (fromguid != 0) {
916 dsl_dataset_t *snap;
917 uint64_t obj = dsl_dataset_phys(ds)->ds_prev_snap_obj;
918
919 /* Find snapshot in this dir that matches fromguid. */
920 while (obj != 0) {
921 error = dsl_dataset_hold_obj(dp, obj, FTAG,
922 &snap);
923 if (error != 0)
924 return (SET_ERROR(ENODEV));
925 if (snap->ds_dir != ds->ds_dir) {
926 dsl_dataset_rele(snap, FTAG);
927 return (SET_ERROR(ENODEV));
928 }
929 if (dsl_dataset_phys(snap)->ds_guid == fromguid)
930 break;
931 obj = dsl_dataset_phys(snap)->ds_prev_snap_obj;
932 dsl_dataset_rele(snap, FTAG);
933 }
934 if (obj == 0)
935 return (SET_ERROR(ENODEV));
936
937 if (drba->drba_cookie->drc_force) {
938 drba->drba_snapobj = obj;
939 } else {
940 /*
941 * If we are not forcing, there must be no
942 * changes since fromsnap.
943 */
944 if (dsl_dataset_modified_since_snap(ds, snap)) {
945 dsl_dataset_rele(snap, FTAG);
946 return (SET_ERROR(ETXTBSY));
947 }
948 drba->drba_snapobj = ds->ds_prev->ds_object;
949 }
950
951 dsl_dataset_rele(snap, FTAG);
952 } else {
953 /* if full, most recent snapshot must be $ORIGIN */
954 if (dsl_dataset_phys(ds)->ds_prev_snap_txg >= TXG_INITIAL)
955 return (SET_ERROR(ENODEV));
956 drba->drba_snapobj = dsl_dataset_phys(ds)->ds_prev_snap_obj;
957 }
958
959 return (0);
960
961 }
962
963 static int
964 dmu_recv_begin_check(void *arg, dmu_tx_t *tx)
965 {
966 dmu_recv_begin_arg_t *drba = arg;
967 dsl_pool_t *dp = dmu_tx_pool(tx);
968 struct drr_begin *drrb = drba->drba_cookie->drc_drrb;
969 uint64_t fromguid = drrb->drr_fromguid;
970 int flags = drrb->drr_flags;
971 int error;
972 uint64_t featureflags = DMU_GET_FEATUREFLAGS(drrb->drr_versioninfo);
973 dsl_dataset_t *ds;
974 const char *tofs = drba->drba_cookie->drc_tofs;
975
976 /* already checked */
977 ASSERT3U(drrb->drr_magic, ==, DMU_BACKUP_MAGIC);
978
979 if (DMU_GET_STREAM_HDRTYPE(drrb->drr_versioninfo) ==
980 DMU_COMPOUNDSTREAM ||
981 drrb->drr_type >= DMU_OST_NUMTYPES ||
982 ((flags & DRR_FLAG_CLONE) && drba->drba_origin == NULL))
983 return (SET_ERROR(EINVAL));
984
985 /* Verify pool version supports SA if SA_SPILL feature set */
986 if ((featureflags & DMU_BACKUP_FEATURE_SA_SPILL) &&
987 spa_version(dp->dp_spa) < SPA_VERSION_SA)
988 return (SET_ERROR(ENOTSUP));
989
990 /*
991 * The receiving code doesn't know how to translate a WRITE_EMBEDDED
992 * record to a plan WRITE record, so the pool must have the
993 * EMBEDDED_DATA feature enabled if the stream has WRITE_EMBEDDED
994 * records. Same with WRITE_EMBEDDED records that use LZ4 compression.
995 */
996 if ((featureflags & DMU_BACKUP_FEATURE_EMBED_DATA) &&
997 !spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_EMBEDDED_DATA))
998 return (SET_ERROR(ENOTSUP));
999 if ((featureflags & DMU_BACKUP_FEATURE_EMBED_DATA_LZ4) &&
1000 !spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_LZ4_COMPRESS))
1001 return (SET_ERROR(ENOTSUP));
1002
1003 error = dsl_dataset_hold(dp, tofs, FTAG, &ds);
1004 if (error == 0) {
1005 /* target fs already exists; recv into temp clone */
1006
1007 /* Can't recv a clone into an existing fs */
1008 if (flags & DRR_FLAG_CLONE) {
1009 dsl_dataset_rele(ds, FTAG);
1010 return (SET_ERROR(EINVAL));
1011 }
1012
1013 error = recv_begin_check_existing_impl(drba, ds, fromguid);
1014 dsl_dataset_rele(ds, FTAG);
1015 } else if (error == ENOENT) {
1016 /* target fs does not exist; must be a full backup or clone */
1017 char buf[MAXNAMELEN];
1018
1019 /*
1020 * If it's a non-clone incremental, we are missing the
1021 * target fs, so fail the recv.
1022 */
1023 if (fromguid != 0 && !(flags & DRR_FLAG_CLONE))
1024 return (SET_ERROR(ENOENT));
1025
1026 /* Open the parent of tofs */
1027 ASSERT3U(strlen(tofs), <, MAXNAMELEN);
1028 (void) strlcpy(buf, tofs, strrchr(tofs, '/') - tofs + 1);
1029 error = dsl_dataset_hold(dp, buf, FTAG, &ds);
1030 if (error != 0)
1031 return (error);
1032
1033 /*
1034 * Check filesystem and snapshot limits before receiving. We'll
1035 * recheck snapshot limits again at the end (we create the
1036 * filesystems and increment those counts during begin_sync).
1037 */
1038 error = dsl_fs_ss_limit_check(ds->ds_dir, 1,
1039 ZFS_PROP_FILESYSTEM_LIMIT, NULL, drba->drba_cred);
1040 if (error != 0) {
1041 dsl_dataset_rele(ds, FTAG);
1042 return (error);
1043 }
1044
1045 error = dsl_fs_ss_limit_check(ds->ds_dir, 1,
1046 ZFS_PROP_SNAPSHOT_LIMIT, NULL, drba->drba_cred);
1047 if (error != 0) {
1048 dsl_dataset_rele(ds, FTAG);
1049 return (error);
1050 }
1051
1052 if (drba->drba_origin != NULL) {
1053 dsl_dataset_t *origin;
1054 error = dsl_dataset_hold(dp, drba->drba_origin,
1055 FTAG, &origin);
1056 if (error != 0) {
1057 dsl_dataset_rele(ds, FTAG);
1058 return (error);
1059 }
1060 if (!origin->ds_is_snapshot) {
1061 dsl_dataset_rele(origin, FTAG);
1062 dsl_dataset_rele(ds, FTAG);
1063 return (SET_ERROR(EINVAL));
1064 }
1065 if (dsl_dataset_phys(origin)->ds_guid != fromguid) {
1066 dsl_dataset_rele(origin, FTAG);
1067 dsl_dataset_rele(ds, FTAG);
1068 return (SET_ERROR(ENODEV));
1069 }
1070 dsl_dataset_rele(origin, FTAG);
1071 }
1072 dsl_dataset_rele(ds, FTAG);
1073 error = 0;
1074 }
1075 return (error);
1076 }
1077
1078 static void
1079 dmu_recv_begin_sync(void *arg, dmu_tx_t *tx)
1080 {
1081 dmu_recv_begin_arg_t *drba = arg;
1082 dsl_pool_t *dp = dmu_tx_pool(tx);
1083 struct drr_begin *drrb = drba->drba_cookie->drc_drrb;
1084 const char *tofs = drba->drba_cookie->drc_tofs;
1085 dsl_dataset_t *ds, *newds;
1086 uint64_t dsobj;
1087 int error;
1088 uint64_t crflags;
1089
1090 crflags = (drrb->drr_flags & DRR_FLAG_CI_DATA) ?
1091 DS_FLAG_CI_DATASET : 0;
1092
1093 error = dsl_dataset_hold(dp, tofs, FTAG, &ds);
1094 if (error == 0) {
1095 /* create temporary clone */
1096 dsl_dataset_t *snap = NULL;
1097 if (drba->drba_snapobj != 0) {
1098 VERIFY0(dsl_dataset_hold_obj(dp,
1099 drba->drba_snapobj, FTAG, &snap));
1100 }
1101 dsobj = dsl_dataset_create_sync(ds->ds_dir, recv_clone_name,
1102 snap, crflags, drba->drba_cred, tx);
1103 dsl_dataset_rele(snap, FTAG);
1104 dsl_dataset_rele(ds, FTAG);
1105 } else {
1106 dsl_dir_t *dd;
1107 const char *tail;
1108 dsl_dataset_t *origin = NULL;
1109
1110 VERIFY0(dsl_dir_hold(dp, tofs, FTAG, &dd, &tail));
1111
1112 if (drba->drba_origin != NULL) {
1113 VERIFY0(dsl_dataset_hold(dp, drba->drba_origin,
1114 FTAG, &origin));
1115 }
1116
1117 /* Create new dataset. */
1118 dsobj = dsl_dataset_create_sync(dd,
1119 strrchr(tofs, '/') + 1,
1120 origin, crflags, drba->drba_cred, tx);
1121 if (origin != NULL)
1122 dsl_dataset_rele(origin, FTAG);
1123 dsl_dir_rele(dd, FTAG);
1124 drba->drba_cookie->drc_newfs = B_TRUE;
1125 }
1126 VERIFY0(dsl_dataset_own_obj(dp, dsobj, dmu_recv_tag, &newds));
1127
1128 dmu_buf_will_dirty(newds->ds_dbuf, tx);
1129 dsl_dataset_phys(newds)->ds_flags |= DS_FLAG_INCONSISTENT;
1130
1131 /*
1132 * If we actually created a non-clone, we need to create the
1133 * objset in our new dataset.
1134 */
1135 if (BP_IS_HOLE(dsl_dataset_get_blkptr(newds))) {
1136 (void) dmu_objset_create_impl(dp->dp_spa,
1137 newds, dsl_dataset_get_blkptr(newds), drrb->drr_type, tx);
1138 }
1139
1140 drba->drba_cookie->drc_ds = newds;
1141
1142 spa_history_log_internal_ds(newds, "receive", tx, "");
1143 }
1144
1145 /*
1146 * NB: callers *MUST* call dmu_recv_stream() if dmu_recv_begin()
1147 * succeeds; otherwise we will leak the holds on the datasets.
1148 */
1149 int
1150 dmu_recv_begin(char *tofs, char *tosnap, struct drr_begin *drrb,
1151 boolean_t force, char *origin, dmu_recv_cookie_t *drc)
1152 {
1153 dmu_recv_begin_arg_t drba = { 0 };
1154 dmu_replay_record_t *drr;
1155
1156 bzero(drc, sizeof (dmu_recv_cookie_t));
1157 drc->drc_drrb = drrb;
1158 drc->drc_tosnap = tosnap;
1159 drc->drc_tofs = tofs;
1160 drc->drc_force = force;
1161 drc->drc_cred = CRED();
1162
1163 if (drrb->drr_magic == BSWAP_64(DMU_BACKUP_MAGIC))
1164 drc->drc_byteswap = B_TRUE;
1165 else if (drrb->drr_magic != DMU_BACKUP_MAGIC)
1166 return (SET_ERROR(EINVAL));
1167
1168 drr = kmem_zalloc(sizeof (dmu_replay_record_t), KM_SLEEP);
1169 drr->drr_type = DRR_BEGIN;
1170 drr->drr_u.drr_begin = *drc->drc_drrb;
1171 if (drc->drc_byteswap) {
1172 fletcher_4_incremental_byteswap(drr,
1173 sizeof (dmu_replay_record_t), &drc->drc_cksum);
1174 } else {
1175 fletcher_4_incremental_native(drr,
1176 sizeof (dmu_replay_record_t), &drc->drc_cksum);
1177 }
1178 kmem_free(drr, sizeof (dmu_replay_record_t));
1179
1180 if (drc->drc_byteswap) {
1181 drrb->drr_magic = BSWAP_64(drrb->drr_magic);
1182 drrb->drr_versioninfo = BSWAP_64(drrb->drr_versioninfo);
1183 drrb->drr_creation_time = BSWAP_64(drrb->drr_creation_time);
1184 drrb->drr_type = BSWAP_32(drrb->drr_type);
1185 drrb->drr_toguid = BSWAP_64(drrb->drr_toguid);
1186 drrb->drr_fromguid = BSWAP_64(drrb->drr_fromguid);
1187 }
1188
1189 drba.drba_origin = origin;
1190 drba.drba_cookie = drc;
1191 drba.drba_cred = CRED();
1192
1193 return (dsl_sync_task(tofs, dmu_recv_begin_check, dmu_recv_begin_sync,
1194 &drba, 5, ZFS_SPACE_CHECK_NORMAL));
1195 }
1196
1197 struct restorearg {
1198 int err;
1199 boolean_t byteswap;
1200 vnode_t *vp;
1201 char *buf;
1202 uint64_t voff;
1203 int bufsize; /* amount of memory allocated for buf */
1204 zio_cksum_t cksum;
1205 avl_tree_t *guid_to_ds_map;
1206 };
1207
1208 typedef struct guid_map_entry {
1209 uint64_t guid;
1210 dsl_dataset_t *gme_ds;
1211 avl_node_t avlnode;
1212 } guid_map_entry_t;
1213
1214 static int
1215 guid_compare(const void *arg1, const void *arg2)
1216 {
1217 const guid_map_entry_t *gmep1 = arg1;
1218 const guid_map_entry_t *gmep2 = arg2;
1219
1220 if (gmep1->guid < gmep2->guid)
1221 return (-1);
1222 else if (gmep1->guid > gmep2->guid)
1223 return (1);
1224 return (0);
1225 }
1226
1227 static void
1228 free_guid_map_onexit(void *arg)
1229 {
1230 avl_tree_t *ca = arg;
1231 void *cookie = NULL;
1232 guid_map_entry_t *gmep;
1233
1234 while ((gmep = avl_destroy_nodes(ca, &cookie)) != NULL) {
1235 dsl_dataset_long_rele(gmep->gme_ds, gmep);
1236 dsl_dataset_rele(gmep->gme_ds, gmep);
1237 kmem_free(gmep, sizeof (guid_map_entry_t));
1238 }
1239 avl_destroy(ca);
1240 kmem_free(ca, sizeof (avl_tree_t));
1241 }
1242
1243 static void *
1244 restore_read(struct restorearg *ra, int len, char *buf)
1245 {
1246 int done = 0;
1247
1248 if (buf == NULL)
1249 buf = ra->buf;
1250
1251 /* some things will require 8-byte alignment, so everything must */
1252 ASSERT0(len % 8);
1253
1254 while (done < len) {
1255 ssize_t resid;
1256
1257 ra->err = vn_rdwr(UIO_READ, ra->vp,
1258 buf + done, len - done,
1259 ra->voff, UIO_SYSSPACE, FAPPEND,
1260 RLIM64_INFINITY, CRED(), &resid);
1261
1262 if (resid == len - done)
1263 ra->err = SET_ERROR(EINVAL);
1264 ra->voff += len - done - resid;
1265 done = len - resid;
1266 if (ra->err != 0)
1267 return (NULL);
1268 }
1269
1270 ASSERT3U(done, ==, len);
1271 if (ra->byteswap)
1272 fletcher_4_incremental_byteswap(buf, len, &ra->cksum);
1273 else
1274 fletcher_4_incremental_native(buf, len, &ra->cksum);
1275 return (buf);
1276 }
1277
1278 noinline static void
1279 backup_byteswap(dmu_replay_record_t *drr)
1280 {
1281 #define DO64(X) (drr->drr_u.X = BSWAP_64(drr->drr_u.X))
1282 #define DO32(X) (drr->drr_u.X = BSWAP_32(drr->drr_u.X))
1283 drr->drr_type = BSWAP_32(drr->drr_type);
1284 drr->drr_payloadlen = BSWAP_32(drr->drr_payloadlen);
1285 switch (drr->drr_type) {
1286 case DRR_BEGIN:
1287 DO64(drr_begin.drr_magic);
1288 DO64(drr_begin.drr_versioninfo);
1289 DO64(drr_begin.drr_creation_time);
1290 DO32(drr_begin.drr_type);
1291 DO32(drr_begin.drr_flags);
1292 DO64(drr_begin.drr_toguid);
1293 DO64(drr_begin.drr_fromguid);
1294 break;
1295 case DRR_OBJECT:
1296 DO64(drr_object.drr_object);
1297 DO32(drr_object.drr_type);
1298 DO32(drr_object.drr_bonustype);
1299 DO32(drr_object.drr_blksz);
1300 DO32(drr_object.drr_bonuslen);
1301 DO64(drr_object.drr_toguid);
1302 break;
1303 case DRR_FREEOBJECTS:
1304 DO64(drr_freeobjects.drr_firstobj);
1305 DO64(drr_freeobjects.drr_numobjs);
1306 DO64(drr_freeobjects.drr_toguid);
1307 break;
1308 case DRR_WRITE:
1309 DO64(drr_write.drr_object);
1310 DO32(drr_write.drr_type);
1311 DO64(drr_write.drr_offset);
1312 DO64(drr_write.drr_length);
1313 DO64(drr_write.drr_toguid);
1314 DO64(drr_write.drr_key.ddk_cksum.zc_word[0]);
1315 DO64(drr_write.drr_key.ddk_cksum.zc_word[1]);
1316 DO64(drr_write.drr_key.ddk_cksum.zc_word[2]);
1317 DO64(drr_write.drr_key.ddk_cksum.zc_word[3]);
1318 DO64(drr_write.drr_key.ddk_prop);
1319 break;
1320 case DRR_WRITE_BYREF:
1321 DO64(drr_write_byref.drr_object);
1322 DO64(drr_write_byref.drr_offset);
1323 DO64(drr_write_byref.drr_length);
1324 DO64(drr_write_byref.drr_toguid);
1325 DO64(drr_write_byref.drr_refguid);
1326 DO64(drr_write_byref.drr_refobject);
1327 DO64(drr_write_byref.drr_refoffset);
1328 DO64(drr_write_byref.drr_key.ddk_cksum.zc_word[0]);
1329 DO64(drr_write_byref.drr_key.ddk_cksum.zc_word[1]);
1330 DO64(drr_write_byref.drr_key.ddk_cksum.zc_word[2]);
1331 DO64(drr_write_byref.drr_key.ddk_cksum.zc_word[3]);
1332 DO64(drr_write_byref.drr_key.ddk_prop);
1333 break;
1334 case DRR_WRITE_EMBEDDED:
1335 DO64(drr_write_embedded.drr_object);
1336 DO64(drr_write_embedded.drr_offset);
1337 DO64(drr_write_embedded.drr_length);
1338 DO64(drr_write_embedded.drr_toguid);
1339 DO32(drr_write_embedded.drr_lsize);
1340 DO32(drr_write_embedded.drr_psize);
1341 break;
1342 case DRR_FREE:
1343 DO64(drr_free.drr_object);
1344 DO64(drr_free.drr_offset);
1345 DO64(drr_free.drr_length);
1346 DO64(drr_free.drr_toguid);
1347 break;
1348 case DRR_SPILL:
1349 DO64(drr_spill.drr_object);
1350 DO64(drr_spill.drr_length);
1351 DO64(drr_spill.drr_toguid);
1352 break;
1353 case DRR_END:
1354 DO64(drr_end.drr_checksum.zc_word[0]);
1355 DO64(drr_end.drr_checksum.zc_word[1]);
1356 DO64(drr_end.drr_checksum.zc_word[2]);
1357 DO64(drr_end.drr_checksum.zc_word[3]);
1358 DO64(drr_end.drr_toguid);
1359 break;
1360 default:
1361 break;
1362 }
1363 #undef DO64
1364 #undef DO32
1365 }
1366
1367 static inline uint8_t
1368 deduce_nblkptr(dmu_object_type_t bonus_type, uint64_t bonus_size)
1369 {
1370 if (bonus_type == DMU_OT_SA) {
1371 return (1);
1372 } else {
1373 return (1 +
1374 ((DN_MAX_BONUSLEN - bonus_size) >> SPA_BLKPTRSHIFT));
1375 }
1376 }
1377
1378 noinline static int
1379 restore_object(struct restorearg *ra, objset_t *os, struct drr_object *drro)
1380 {
1381 dmu_object_info_t doi;
1382 dmu_tx_t *tx;
1383 void *data = NULL;
1384 uint64_t object;
1385 int err;
1386
1387 if (drro->drr_type == DMU_OT_NONE ||
1388 !DMU_OT_IS_VALID(drro->drr_type) ||
1389 !DMU_OT_IS_VALID(drro->drr_bonustype) ||
1390 drro->drr_checksumtype >= ZIO_CHECKSUM_FUNCTIONS ||
1391 drro->drr_compress >= ZIO_COMPRESS_FUNCTIONS ||
1392 P2PHASE(drro->drr_blksz, SPA_MINBLOCKSIZE) ||
1393 drro->drr_blksz < SPA_MINBLOCKSIZE ||
1394 drro->drr_blksz > SPA_MAXBLOCKSIZE ||
1395 drro->drr_bonuslen > DN_MAX_BONUSLEN) {
1396 return (SET_ERROR(EINVAL));
1397 }
1398
1399 err = dmu_object_info(os, drro->drr_object, &doi);
1400
1401 if (err != 0 && err != ENOENT)
1402 return (SET_ERROR(EINVAL));
1403 object = err == 0 ? drro->drr_object : DMU_NEW_OBJECT;
1404
1405 if (drro->drr_bonuslen) {
1406 data = restore_read(ra, P2ROUNDUP(drro->drr_bonuslen, 8), NULL);
1407 if (ra->err != 0)
1408 return (ra->err);
1409 }
1410
1411 /*
1412 * If we are losing blkptrs or changing the block size this must
1413 * be a new file instance. We must clear out the previous file
1414 * contents before we can change this type of metadata in the dnode.
1415 */
1416 if (err == 0) {
1417 int nblkptr;
1418
1419 nblkptr = deduce_nblkptr(drro->drr_bonustype,
1420 drro->drr_bonuslen);
1421
1422 if (drro->drr_blksz != doi.doi_data_block_size ||
1423 nblkptr < doi.doi_nblkptr) {
1424 err = dmu_free_long_range(os, drro->drr_object,
1425 0, DMU_OBJECT_END);
1426 if (err != 0)
1427 return (SET_ERROR(EINVAL));
1428 }
1429 }
1430
1431 tx = dmu_tx_create(os);
1432 dmu_tx_hold_bonus(tx, object);
1433 err = dmu_tx_assign(tx, TXG_WAIT);
1434 if (err != 0) {
1435 dmu_tx_abort(tx);
1436 return (err);
1437 }
1438
1439 if (object == DMU_NEW_OBJECT) {
1440 /* currently free, want to be allocated */
1441 err = dmu_object_claim(os, drro->drr_object,
1442 drro->drr_type, drro->drr_blksz,
1443 drro->drr_bonustype, drro->drr_bonuslen, tx);
1444 } else if (drro->drr_type != doi.doi_type ||
1445 drro->drr_blksz != doi.doi_data_block_size ||
1446 drro->drr_bonustype != doi.doi_bonus_type ||
1447 drro->drr_bonuslen != doi.doi_bonus_size) {
1448 /* currently allocated, but with different properties */
1449 err = dmu_object_reclaim(os, drro->drr_object,
1450 drro->drr_type, drro->drr_blksz,
1451 drro->drr_bonustype, drro->drr_bonuslen, tx);
1452 }
1453 if (err != 0) {
1454 dmu_tx_commit(tx);
1455 return (SET_ERROR(EINVAL));
1456 }
1457
1458 dmu_object_set_checksum(os, drro->drr_object, drro->drr_checksumtype,
1459 tx);
1460 dmu_object_set_compress(os, drro->drr_object, drro->drr_compress, tx);
1461
1462 if (data != NULL) {
1463 dmu_buf_t *db;
1464
1465 VERIFY(0 == dmu_bonus_hold(os, drro->drr_object, FTAG, &db));
1466 dmu_buf_will_dirty(db, tx);
1467
1468 ASSERT3U(db->db_size, >=, drro->drr_bonuslen);
1469 bcopy(data, db->db_data, drro->drr_bonuslen);
1470 if (ra->byteswap) {
1471 dmu_object_byteswap_t byteswap =
1472 DMU_OT_BYTESWAP(drro->drr_bonustype);
1473 dmu_ot_byteswap[byteswap].ob_func(db->db_data,
1474 drro->drr_bonuslen);
1475 }
1476 dmu_buf_rele(db, FTAG);
1477 }
1478 dmu_tx_commit(tx);
1479 return (0);
1480 }
1481
1482 /* ARGSUSED */
1483 noinline static int
1484 restore_freeobjects(struct restorearg *ra, objset_t *os,
1485 struct drr_freeobjects *drrfo)
1486 {
1487 uint64_t obj;
1488
1489 if (drrfo->drr_firstobj + drrfo->drr_numobjs < drrfo->drr_firstobj)
1490 return (SET_ERROR(EINVAL));
1491
1492 for (obj = drrfo->drr_firstobj;
1493 obj < drrfo->drr_firstobj + drrfo->drr_numobjs;
1494 (void) dmu_object_next(os, &obj, FALSE, 0)) {
1495 int err;
1496
1497 if (dmu_object_info(os, obj, NULL) != 0)
1498 continue;
1499
1500 err = dmu_free_long_object(os, obj);
1501 if (err != 0)
1502 return (err);
1503 }
1504 return (0);
1505 }
1506
1507 noinline static int
1508 restore_write(struct restorearg *ra, objset_t *os,
1509 struct drr_write *drrw)
1510 {
1511 dmu_tx_t *tx;
1512 dmu_buf_t *bonus;
1513 arc_buf_t *abuf;
1514 void *data;
1515 int err;
1516
1517 if (drrw->drr_offset + drrw->drr_length < drrw->drr_offset ||
1518 !DMU_OT_IS_VALID(drrw->drr_type))
1519 return (SET_ERROR(EINVAL));
1520
1521 if (dmu_object_info(os, drrw->drr_object, NULL) != 0)
1522 return (SET_ERROR(EINVAL));
1523
1524 if (dmu_bonus_hold(os, drrw->drr_object, FTAG, &bonus) != 0)
1525 return (SET_ERROR(EINVAL));
1526
1527 abuf = dmu_request_arcbuf(bonus, drrw->drr_length);
1528
1529 data = restore_read(ra, drrw->drr_length, abuf->b_data);
1530 if (data == NULL) {
1531 dmu_return_arcbuf(abuf);
1532 dmu_buf_rele(bonus, FTAG);
1533 return (ra->err);
1534 }
1535
1536 tx = dmu_tx_create(os);
1537
1538 dmu_tx_hold_write(tx, drrw->drr_object,
1539 drrw->drr_offset, drrw->drr_length);
1540 err = dmu_tx_assign(tx, TXG_WAIT);
1541 if (err != 0) {
1542 dmu_return_arcbuf(abuf);
1543 dmu_buf_rele(bonus, FTAG);
1544 dmu_tx_abort(tx);
1545 return (err);
1546 }
1547 if (ra->byteswap) {
1548 dmu_object_byteswap_t byteswap =
1549 DMU_OT_BYTESWAP(drrw->drr_type);
1550 dmu_ot_byteswap[byteswap].ob_func(data, drrw->drr_length);
1551 }
1552 dmu_assign_arcbuf(bonus, drrw->drr_offset, abuf, tx);
1553 dmu_tx_commit(tx);
1554 dmu_buf_rele(bonus, FTAG);
1555 return (0);
1556 }
1557
1558 /*
1559 * Handle a DRR_WRITE_BYREF record. This record is used in dedup'ed
1560 * streams to refer to a copy of the data that is already on the
1561 * system because it came in earlier in the stream. This function
1562 * finds the earlier copy of the data, and uses that copy instead of
1563 * data from the stream to fulfill this write.
1564 */
1565 static int
1566 restore_write_byref(struct restorearg *ra, objset_t *os,
1567 struct drr_write_byref *drrwbr)
1568 {
1569 dmu_tx_t *tx;
1570 int err;
1571 guid_map_entry_t gmesrch;
1572 guid_map_entry_t *gmep;
1573 avl_index_t where;
1574 objset_t *ref_os = NULL;
1575 dmu_buf_t *dbp;
1576
1577 if (drrwbr->drr_offset + drrwbr->drr_length < drrwbr->drr_offset)
1578 return (SET_ERROR(EINVAL));
1579
1580 /*
1581 * If the GUID of the referenced dataset is different from the
1582 * GUID of the target dataset, find the referenced dataset.
1583 */
1584 if (drrwbr->drr_toguid != drrwbr->drr_refguid) {
1585 gmesrch.guid = drrwbr->drr_refguid;
1586 if ((gmep = avl_find(ra->guid_to_ds_map, &gmesrch,
1587 &where)) == NULL) {
1588 return (SET_ERROR(EINVAL));
1589 }
1590 if (dmu_objset_from_ds(gmep->gme_ds, &ref_os))
1591 return (SET_ERROR(EINVAL));
1592 } else {
1593 ref_os = os;
1594 }
1595
1596 err = dmu_buf_hold(ref_os, drrwbr->drr_refobject,
1597 drrwbr->drr_refoffset, FTAG, &dbp, DMU_READ_PREFETCH);
1598 if (err != 0)
1599 return (err);
1600
1601 tx = dmu_tx_create(os);
1602
1603 dmu_tx_hold_write(tx, drrwbr->drr_object,
1604 drrwbr->drr_offset, drrwbr->drr_length);
1605 err = dmu_tx_assign(tx, TXG_WAIT);
1606 if (err != 0) {
1607 dmu_tx_abort(tx);
1608 return (err);
1609 }
1610 dmu_write(os, drrwbr->drr_object,
1611 drrwbr->drr_offset, drrwbr->drr_length, dbp->db_data, tx);
1612 dmu_buf_rele(dbp, FTAG);
1613 dmu_tx_commit(tx);
1614 return (0);
1615 }
1616
1617 static int
1618 restore_write_embedded(struct restorearg *ra, objset_t *os,
1619 struct drr_write_embedded *drrwnp)
1620 {
1621 dmu_tx_t *tx;
1622 int err;
1623 void *data;
1624
1625 if (drrwnp->drr_offset + drrwnp->drr_length < drrwnp->drr_offset)
1626 return (EINVAL);
1627
1628 if (drrwnp->drr_psize > BPE_PAYLOAD_SIZE)
1629 return (EINVAL);
1630
1631 if (drrwnp->drr_etype >= NUM_BP_EMBEDDED_TYPES)
1632 return (EINVAL);
1633 if (drrwnp->drr_compression >= ZIO_COMPRESS_FUNCTIONS)
1634 return (EINVAL);
1635
1636 data = restore_read(ra, P2ROUNDUP(drrwnp->drr_psize, 8), NULL);
1637 if (data == NULL)
1638 return (ra->err);
1639
1640 tx = dmu_tx_create(os);
1641
1642 dmu_tx_hold_write(tx, drrwnp->drr_object,
1643 drrwnp->drr_offset, drrwnp->drr_length);
1644 err = dmu_tx_assign(tx, TXG_WAIT);
1645 if (err != 0) {
1646 dmu_tx_abort(tx);
1647 return (err);
1648 }
1649
1650 dmu_write_embedded(os, drrwnp->drr_object,
1651 drrwnp->drr_offset, data, drrwnp->drr_etype,
1652 drrwnp->drr_compression, drrwnp->drr_lsize, drrwnp->drr_psize,
1653 ra->byteswap ^ ZFS_HOST_BYTEORDER, tx);
1654
1655 dmu_tx_commit(tx);
1656 return (0);
1657 }
1658
1659 static int
1660 restore_spill(struct restorearg *ra, objset_t *os, struct drr_spill *drrs)
1661 {
1662 dmu_tx_t *tx;
1663 void *data;
1664 dmu_buf_t *db, *db_spill;
1665 int err;
1666
1667 if (drrs->drr_length < SPA_MINBLOCKSIZE ||
1668 drrs->drr_length > SPA_MAXBLOCKSIZE)
1669 return (SET_ERROR(EINVAL));
1670
1671 data = restore_read(ra, drrs->drr_length, NULL);
1672 if (data == NULL)
1673 return (ra->err);
1674
1675 if (dmu_object_info(os, drrs->drr_object, NULL) != 0)
1676 return (SET_ERROR(EINVAL));
1677
1678 VERIFY(0 == dmu_bonus_hold(os, drrs->drr_object, FTAG, &db));
1679 if ((err = dmu_spill_hold_by_bonus(db, FTAG, &db_spill)) != 0) {
1680 dmu_buf_rele(db, FTAG);
1681 return (err);
1682 }
1683
1684 tx = dmu_tx_create(os);
1685
1686 dmu_tx_hold_spill(tx, db->db_object);
1687
1688 err = dmu_tx_assign(tx, TXG_WAIT);
1689 if (err != 0) {
1690 dmu_buf_rele(db, FTAG);
1691 dmu_buf_rele(db_spill, FTAG);
1692 dmu_tx_abort(tx);
1693 return (err);
1694 }
1695 dmu_buf_will_dirty(db_spill, tx);
1696
1697 if (db_spill->db_size < drrs->drr_length)
1698 VERIFY(0 == dbuf_spill_set_blksz(db_spill,
1699 drrs->drr_length, tx));
1700 bcopy(data, db_spill->db_data, drrs->drr_length);
1701
1702 dmu_buf_rele(db, FTAG);
1703 dmu_buf_rele(db_spill, FTAG);
1704
1705 dmu_tx_commit(tx);
1706 return (0);
1707 }
1708
1709 /* ARGSUSED */
1710 noinline static int
1711 restore_free(struct restorearg *ra, objset_t *os,
1712 struct drr_free *drrf)
1713 {
1714 int err;
1715
1716 if (drrf->drr_length != -1ULL &&
1717 drrf->drr_offset + drrf->drr_length < drrf->drr_offset)
1718 return (SET_ERROR(EINVAL));
1719
1720 if (dmu_object_info(os, drrf->drr_object, NULL) != 0)
1721 return (SET_ERROR(EINVAL));
1722
1723 err = dmu_free_long_range(os, drrf->drr_object,
1724 drrf->drr_offset, drrf->drr_length);
1725 return (err);
1726 }
1727
1728 /* used to destroy the drc_ds on error */
1729 static void
1730 dmu_recv_cleanup_ds(dmu_recv_cookie_t *drc)
1731 {
1732 char name[MAXNAMELEN];
1733 dsl_dataset_name(drc->drc_ds, name);
1734 dsl_dataset_disown(drc->drc_ds, dmu_recv_tag);
1735 (void) dsl_destroy_head(name);
1736 }
1737
1738 /*
1739 * NB: callers *must* call dmu_recv_end() if this succeeds.
1740 */
1741 int
1742 dmu_recv_stream(dmu_recv_cookie_t *drc, vnode_t *vp, offset_t *voffp,
1743 int cleanup_fd, uint64_t *action_handlep)
1744 {
1745 struct restorearg ra = { 0 };
1746 dmu_replay_record_t *drr;
1747 objset_t *os;
1748 zio_cksum_t pcksum;
1749 int featureflags;
1750
1751 ra.byteswap = drc->drc_byteswap;
1752 ra.cksum = drc->drc_cksum;
1753 ra.vp = vp;
1754 ra.voff = *voffp;
1755 ra.bufsize = 1<<20;
1756 ra.buf = vmem_alloc(ra.bufsize, KM_SLEEP);
1757
1758 /* these were verified in dmu_recv_begin */
1759 ASSERT3U(DMU_GET_STREAM_HDRTYPE(drc->drc_drrb->drr_versioninfo), ==,
1760 DMU_SUBSTREAM);
1761 ASSERT3U(drc->drc_drrb->drr_type, <, DMU_OST_NUMTYPES);
1762
1763 /*
1764 * Open the objset we are modifying.
1765 */
1766 VERIFY0(dmu_objset_from_ds(drc->drc_ds, &os));
1767
1768 ASSERT(dsl_dataset_phys(drc->drc_ds)->ds_flags & DS_FLAG_INCONSISTENT);
1769
1770 featureflags = DMU_GET_FEATUREFLAGS(drc->drc_drrb->drr_versioninfo);
1771
1772 /* if this stream is dedup'ed, set up the avl tree for guid mapping */
1773 if (featureflags & DMU_BACKUP_FEATURE_DEDUP) {
1774 minor_t minor;
1775
1776 if (cleanup_fd == -1) {
1777 ra.err = SET_ERROR(EBADF);
1778 goto out;
1779 }
1780 ra.err = zfs_onexit_fd_hold(cleanup_fd, &minor);
1781 if (ra.err != 0) {
1782 cleanup_fd = -1;
1783 goto out;
1784 }
1785
1786 if (*action_handlep == 0) {
1787 ra.guid_to_ds_map =
1788 kmem_alloc(sizeof (avl_tree_t), KM_SLEEP);
1789 avl_create(ra.guid_to_ds_map, guid_compare,
1790 sizeof (guid_map_entry_t),
1791 offsetof(guid_map_entry_t, avlnode));
1792 ra.err = zfs_onexit_add_cb(minor,
1793 free_guid_map_onexit, ra.guid_to_ds_map,
1794 action_handlep);
1795 if (ra.err != 0)
1796 goto out;
1797 } else {
1798 ra.err = zfs_onexit_cb_data(minor, *action_handlep,
1799 (void **)&ra.guid_to_ds_map);
1800 if (ra.err != 0)
1801 goto out;
1802 }
1803
1804 drc->drc_guid_to_ds_map = ra.guid_to_ds_map;
1805 }
1806
1807 /*
1808 * Read records and process them.
1809 */
1810 pcksum = ra.cksum;
1811 while (ra.err == 0 &&
1812 NULL != (drr = restore_read(&ra, sizeof (*drr), NULL))) {
1813 if (issig(JUSTLOOKING) && issig(FORREAL)) {
1814 ra.err = SET_ERROR(EINTR);
1815 goto out;
1816 }
1817
1818 if (ra.byteswap)
1819 backup_byteswap(drr);
1820
1821 switch (drr->drr_type) {
1822 case DRR_OBJECT:
1823 {
1824 /*
1825 * We need to make a copy of the record header,
1826 * because restore_{object,write} may need to
1827 * restore_read(), which will invalidate drr.
1828 */
1829 struct drr_object drro = drr->drr_u.drr_object;
1830 ra.err = restore_object(&ra, os, &drro);
1831 break;
1832 }
1833 case DRR_FREEOBJECTS:
1834 {
1835 struct drr_freeobjects drrfo =
1836 drr->drr_u.drr_freeobjects;
1837 ra.err = restore_freeobjects(&ra, os, &drrfo);
1838 break;
1839 }
1840 case DRR_WRITE:
1841 {
1842 struct drr_write drrw = drr->drr_u.drr_write;
1843 ra.err = restore_write(&ra, os, &drrw);
1844 break;
1845 }
1846 case DRR_WRITE_BYREF:
1847 {
1848 struct drr_write_byref drrwbr =
1849 drr->drr_u.drr_write_byref;
1850 ra.err = restore_write_byref(&ra, os, &drrwbr);
1851 break;
1852 }
1853 case DRR_WRITE_EMBEDDED:
1854 {
1855 struct drr_write_embedded drrwe =
1856 drr->drr_u.drr_write_embedded;
1857 ra.err = restore_write_embedded(&ra, os, &drrwe);
1858 break;
1859 }
1860 case DRR_FREE:
1861 {
1862 struct drr_free drrf = drr->drr_u.drr_free;
1863 ra.err = restore_free(&ra, os, &drrf);
1864 break;
1865 }
1866 case DRR_END:
1867 {
1868 struct drr_end drre = drr->drr_u.drr_end;
1869 /*
1870 * We compare against the *previous* checksum
1871 * value, because the stored checksum is of
1872 * everything before the DRR_END record.
1873 */
1874 if (!ZIO_CHECKSUM_EQUAL(drre.drr_checksum, pcksum))
1875 ra.err = SET_ERROR(ECKSUM);
1876 goto out;
1877 }
1878 case DRR_SPILL:
1879 {
1880 struct drr_spill drrs = drr->drr_u.drr_spill;
1881 ra.err = restore_spill(&ra, os, &drrs);
1882 break;
1883 }
1884 default:
1885 ra.err = SET_ERROR(EINVAL);
1886 goto out;
1887 }
1888 pcksum = ra.cksum;
1889 }
1890 ASSERT(ra.err != 0);
1891
1892 out:
1893 if ((featureflags & DMU_BACKUP_FEATURE_DEDUP) && (cleanup_fd != -1))
1894 zfs_onexit_fd_rele(cleanup_fd);
1895
1896 if (ra.err != 0) {
1897 /*
1898 * destroy what we created, so we don't leave it in the
1899 * inconsistent restoring state.
1900 */
1901 dmu_recv_cleanup_ds(drc);
1902 }
1903
1904 vmem_free(ra.buf, ra.bufsize);
1905 *voffp = ra.voff;
1906 return (ra.err);
1907 }
1908
1909 static int
1910 dmu_recv_end_check(void *arg, dmu_tx_t *tx)
1911 {
1912 dmu_recv_cookie_t *drc = arg;
1913 dsl_pool_t *dp = dmu_tx_pool(tx);
1914 int error;
1915
1916 ASSERT3P(drc->drc_ds->ds_owner, ==, dmu_recv_tag);
1917
1918 if (!drc->drc_newfs) {
1919 dsl_dataset_t *origin_head;
1920
1921 error = dsl_dataset_hold(dp, drc->drc_tofs, FTAG, &origin_head);
1922 if (error != 0)
1923 return (error);
1924 if (drc->drc_force) {
1925 /*
1926 * We will destroy any snapshots in tofs (i.e. before
1927 * origin_head) that are after the origin (which is
1928 * the snap before drc_ds, because drc_ds can not
1929 * have any snaps of its own).
1930 */
1931 uint64_t obj;
1932
1933 obj = dsl_dataset_phys(origin_head)->ds_prev_snap_obj;
1934 while (obj !=
1935 dsl_dataset_phys(drc->drc_ds)->ds_prev_snap_obj) {
1936 dsl_dataset_t *snap;
1937 error = dsl_dataset_hold_obj(dp, obj, FTAG,
1938 &snap);
1939 if (error != 0)
1940 return (error);
1941 if (snap->ds_dir != origin_head->ds_dir)
1942 error = SET_ERROR(EINVAL);
1943 if (error == 0) {
1944 error = dsl_destroy_snapshot_check_impl(
1945 snap, B_FALSE);
1946 }
1947 obj = dsl_dataset_phys(snap)->ds_prev_snap_obj;
1948 dsl_dataset_rele(snap, FTAG);
1949 if (error != 0)
1950 return (error);
1951 }
1952 }
1953 error = dsl_dataset_clone_swap_check_impl(drc->drc_ds,
1954 origin_head, drc->drc_force, drc->drc_owner, tx);
1955 if (error != 0) {
1956 dsl_dataset_rele(origin_head, FTAG);
1957 return (error);
1958 }
1959 error = dsl_dataset_snapshot_check_impl(origin_head,
1960 drc->drc_tosnap, tx, B_TRUE, 1, drc->drc_cred);
1961 dsl_dataset_rele(origin_head, FTAG);
1962 if (error != 0)
1963 return (error);
1964
1965 error = dsl_destroy_head_check_impl(drc->drc_ds, 1);
1966 } else {
1967 error = dsl_dataset_snapshot_check_impl(drc->drc_ds,
1968 drc->drc_tosnap, tx, B_TRUE, 1, drc->drc_cred);
1969 }
1970 return (error);
1971 }
1972
1973 static void
1974 dmu_recv_end_sync(void *arg, dmu_tx_t *tx)
1975 {
1976 dmu_recv_cookie_t *drc = arg;
1977 dsl_pool_t *dp = dmu_tx_pool(tx);
1978
1979 spa_history_log_internal_ds(drc->drc_ds, "finish receiving",
1980 tx, "snap=%s", drc->drc_tosnap);
1981
1982 if (!drc->drc_newfs) {
1983 dsl_dataset_t *origin_head;
1984
1985 VERIFY0(dsl_dataset_hold(dp, drc->drc_tofs, FTAG,
1986 &origin_head));
1987
1988 if (drc->drc_force) {
1989 /*
1990 * Destroy any snapshots of drc_tofs (origin_head)
1991 * after the origin (the snap before drc_ds).
1992 */
1993 uint64_t obj;
1994
1995 obj = dsl_dataset_phys(origin_head)->ds_prev_snap_obj;
1996 while (obj !=
1997 dsl_dataset_phys(drc->drc_ds)->ds_prev_snap_obj) {
1998 dsl_dataset_t *snap;
1999 VERIFY0(dsl_dataset_hold_obj(dp, obj, FTAG,
2000 &snap));
2001 ASSERT3P(snap->ds_dir, ==, origin_head->ds_dir);
2002 obj = dsl_dataset_phys(snap)->ds_prev_snap_obj;
2003 dsl_destroy_snapshot_sync_impl(snap,
2004 B_FALSE, tx);
2005 dsl_dataset_rele(snap, FTAG);
2006 }
2007 }
2008 VERIFY3P(drc->drc_ds->ds_prev, ==,
2009 origin_head->ds_prev);
2010
2011 dsl_dataset_clone_swap_sync_impl(drc->drc_ds,
2012 origin_head, tx);
2013 dsl_dataset_snapshot_sync_impl(origin_head,
2014 drc->drc_tosnap, tx);
2015
2016 /* set snapshot's creation time and guid */
2017 dmu_buf_will_dirty(origin_head->ds_prev->ds_dbuf, tx);
2018 dsl_dataset_phys(origin_head->ds_prev)->ds_creation_time =
2019 drc->drc_drrb->drr_creation_time;
2020 dsl_dataset_phys(origin_head->ds_prev)->ds_guid =
2021 drc->drc_drrb->drr_toguid;
2022 dsl_dataset_phys(origin_head->ds_prev)->ds_flags &=
2023 ~DS_FLAG_INCONSISTENT;
2024
2025 dmu_buf_will_dirty(origin_head->ds_dbuf, tx);
2026 dsl_dataset_phys(origin_head)->ds_flags &=
2027 ~DS_FLAG_INCONSISTENT;
2028
2029 dsl_dataset_rele(origin_head, FTAG);
2030 dsl_destroy_head_sync_impl(drc->drc_ds, tx);
2031
2032 if (drc->drc_owner != NULL)
2033 VERIFY3P(origin_head->ds_owner, ==, drc->drc_owner);
2034 } else {
2035 dsl_dataset_t *ds = drc->drc_ds;
2036
2037 dsl_dataset_snapshot_sync_impl(ds, drc->drc_tosnap, tx);
2038
2039 /* set snapshot's creation time and guid */
2040 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx);
2041 dsl_dataset_phys(ds->ds_prev)->ds_creation_time =
2042 drc->drc_drrb->drr_creation_time;
2043 dsl_dataset_phys(ds->ds_prev)->ds_guid =
2044 drc->drc_drrb->drr_toguid;
2045 dsl_dataset_phys(ds->ds_prev)->ds_flags &=
2046 ~DS_FLAG_INCONSISTENT;
2047
2048 dmu_buf_will_dirty(ds->ds_dbuf, tx);
2049 dsl_dataset_phys(ds)->ds_flags &= ~DS_FLAG_INCONSISTENT;
2050 }
2051 drc->drc_newsnapobj = dsl_dataset_phys(drc->drc_ds)->ds_prev_snap_obj;
2052 /*
2053 * Release the hold from dmu_recv_begin. This must be done before
2054 * we return to open context, so that when we free the dataset's dnode,
2055 * we can evict its bonus buffer.
2056 */
2057 dsl_dataset_disown(drc->drc_ds, dmu_recv_tag);
2058 drc->drc_ds = NULL;
2059 }
2060
2061 static int
2062 add_ds_to_guidmap(const char *name, avl_tree_t *guid_map, uint64_t snapobj)
2063 {
2064 dsl_pool_t *dp;
2065 dsl_dataset_t *snapds;
2066 guid_map_entry_t *gmep;
2067 int err;
2068
2069 ASSERT(guid_map != NULL);
2070
2071 err = dsl_pool_hold(name, FTAG, &dp);
2072 if (err != 0)
2073 return (err);
2074 gmep = kmem_alloc(sizeof (*gmep), KM_SLEEP);
2075 err = dsl_dataset_hold_obj(dp, snapobj, gmep, &snapds);
2076 if (err == 0) {
2077 gmep->guid = dsl_dataset_phys(snapds)->ds_guid;
2078 gmep->gme_ds = snapds;
2079 avl_add(guid_map, gmep);
2080 dsl_dataset_long_hold(snapds, gmep);
2081 } else {
2082 kmem_free(gmep, sizeof (*gmep));
2083 }
2084
2085 dsl_pool_rele(dp, FTAG);
2086 return (err);
2087 }
2088
2089 static int dmu_recv_end_modified_blocks = 3;
2090
2091 static int
2092 dmu_recv_existing_end(dmu_recv_cookie_t *drc)
2093 {
2094 int error;
2095
2096 #ifdef _KERNEL
2097 char *name;
2098
2099 /*
2100 * We will be destroying the ds; make sure its origin is unmounted if
2101 * necessary.
2102 */
2103 name = kmem_alloc(MAXNAMELEN, KM_SLEEP);
2104 dsl_dataset_name(drc->drc_ds, name);
2105 zfs_destroy_unmount_origin(name);
2106 kmem_free(name, MAXNAMELEN);
2107 #endif
2108
2109 error = dsl_sync_task(drc->drc_tofs,
2110 dmu_recv_end_check, dmu_recv_end_sync, drc,
2111 dmu_recv_end_modified_blocks, ZFS_SPACE_CHECK_NORMAL);
2112
2113 if (error != 0)
2114 dmu_recv_cleanup_ds(drc);
2115 return (error);
2116 }
2117
2118 static int
2119 dmu_recv_new_end(dmu_recv_cookie_t *drc)
2120 {
2121 int error;
2122
2123 error = dsl_sync_task(drc->drc_tofs,
2124 dmu_recv_end_check, dmu_recv_end_sync, drc,
2125 dmu_recv_end_modified_blocks, ZFS_SPACE_CHECK_NORMAL);
2126
2127 if (error != 0) {
2128 dmu_recv_cleanup_ds(drc);
2129 } else if (drc->drc_guid_to_ds_map != NULL) {
2130 (void) add_ds_to_guidmap(drc->drc_tofs,
2131 drc->drc_guid_to_ds_map,
2132 drc->drc_newsnapobj);
2133 }
2134 return (error);
2135 }
2136
2137 int
2138 dmu_recv_end(dmu_recv_cookie_t *drc, void *owner)
2139 {
2140 drc->drc_owner = owner;
2141
2142 if (drc->drc_newfs)
2143 return (dmu_recv_new_end(drc));
2144 else
2145 return (dmu_recv_existing_end(drc));
2146 }
2147
2148 /*
2149 * Return TRUE if this objset is currently being received into.
2150 */
2151 boolean_t
2152 dmu_objset_is_receiving(objset_t *os)
2153 {
2154 return (os->os_dsl_dataset != NULL &&
2155 os->os_dsl_dataset->ds_owner == dmu_recv_tag);
2156 }
2157
2158 #if defined(_KERNEL)
2159 module_param(zfs_send_corrupt_data, int, 0644);
2160 MODULE_PARM_DESC(zfs_send_corrupt_data, "Allow sending corrupt data");
2161 #endif
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