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Illumos #2901: zfs receive fails for exabyte sparse files
[mirror_zfs.git] / module / zfs / dmu_send.c
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) 2011 by Delphix. All rights reserved.
26 */
27
28 #include <sys/dmu.h>
29 #include <sys/dmu_impl.h>
30 #include <sys/dmu_tx.h>
31 #include <sys/dbuf.h>
32 #include <sys/dnode.h>
33 #include <sys/zfs_context.h>
34 #include <sys/dmu_objset.h>
35 #include <sys/dmu_traverse.h>
36 #include <sys/dsl_dataset.h>
37 #include <sys/dsl_dir.h>
38 #include <sys/dsl_prop.h>
39 #include <sys/dsl_pool.h>
40 #include <sys/dsl_synctask.h>
41 #include <sys/zfs_ioctl.h>
42 #include <sys/zap.h>
43 #include <sys/zio_checksum.h>
44 #include <sys/zfs_znode.h>
45 #include <zfs_fletcher.h>
46 #include <sys/avl.h>
47 #include <sys/ddt.h>
48 #include <sys/zfs_onexit.h>
49
50 /* Set this tunable to TRUE to replace corrupt data with 0x2f5baddb10c */
51 int zfs_send_corrupt_data = B_FALSE;
52
53 static char *dmu_recv_tag = "dmu_recv_tag";
54
55 /*
56 * The list of data whose inclusion in a send stream can be pending from
57 * one call to backup_cb to another. Multiple calls to dump_free() and
58 * dump_freeobjects() can be aggregated into a single DRR_FREE or
59 * DRR_FREEOBJECTS replay record.
60 */
61 typedef enum {
62 PENDING_NONE,
63 PENDING_FREE,
64 PENDING_FREEOBJECTS
65 } pendop_t;
66
67 struct backuparg {
68 dmu_replay_record_t *drr;
69 vnode_t *vp;
70 offset_t *off;
71 objset_t *os;
72 zio_cksum_t zc;
73 uint64_t toguid;
74 int err;
75 pendop_t pending_op;
76 };
77
78 static int
79 dump_bytes(struct backuparg *ba, void *buf, int len)
80 {
81 ssize_t resid; /* have to get resid to get detailed errno */
82 ASSERT3U(len % 8, ==, 0);
83
84 fletcher_4_incremental_native(buf, len, &ba->zc);
85 ba->err = vn_rdwr(UIO_WRITE, ba->vp,
86 (caddr_t)buf, len,
87 0, UIO_SYSSPACE, FAPPEND, RLIM64_INFINITY, CRED(), &resid);
88 *ba->off += len;
89 return (ba->err);
90 }
91
92 static int
93 dump_free(struct backuparg *ba, uint64_t object, uint64_t offset,
94 uint64_t length)
95 {
96 struct drr_free *drrf = &(ba->drr->drr_u.drr_free);
97
98 if (length != -1ULL && offset + length < offset)
99 length = -1ULL;
100
101 /*
102 * If there is a pending op, but it's not PENDING_FREE, push it out,
103 * since free block aggregation can only be done for blocks of the
104 * same type (i.e., DRR_FREE records can only be aggregated with
105 * other DRR_FREE records. DRR_FREEOBJECTS records can only be
106 * aggregated with other DRR_FREEOBJECTS records.
107 */
108 if (ba->pending_op != PENDING_NONE && ba->pending_op != PENDING_FREE) {
109 if (dump_bytes(ba, ba->drr, sizeof (dmu_replay_record_t)) != 0)
110 return (EINTR);
111 ba->pending_op = PENDING_NONE;
112 }
113
114 if (ba->pending_op == PENDING_FREE) {
115 /*
116 * There should never be a PENDING_FREE if length is -1
117 * (because dump_dnode is the only place where this
118 * function is called with a -1, and only after flushing
119 * any pending record).
120 */
121 ASSERT(length != -1ULL);
122 /*
123 * Check to see whether this free block can be aggregated
124 * with pending one.
125 */
126 if (drrf->drr_object == object && drrf->drr_offset +
127 drrf->drr_length == offset) {
128 drrf->drr_length += length;
129 return (0);
130 } else {
131 /* not a continuation. Push out pending record */
132 if (dump_bytes(ba, ba->drr,
133 sizeof (dmu_replay_record_t)) != 0)
134 return (EINTR);
135 ba->pending_op = PENDING_NONE;
136 }
137 }
138 /* create a FREE record and make it pending */
139 bzero(ba->drr, sizeof (dmu_replay_record_t));
140 ba->drr->drr_type = DRR_FREE;
141 drrf->drr_object = object;
142 drrf->drr_offset = offset;
143 drrf->drr_length = length;
144 drrf->drr_toguid = ba->toguid;
145 if (length == -1ULL) {
146 if (dump_bytes(ba, ba->drr, sizeof (dmu_replay_record_t)) != 0)
147 return (EINTR);
148 } else {
149 ba->pending_op = PENDING_FREE;
150 }
151
152 return (0);
153 }
154
155 static int
156 dump_data(struct backuparg *ba, dmu_object_type_t type,
157 uint64_t object, uint64_t offset, int blksz, const blkptr_t *bp, void *data)
158 {
159 struct drr_write *drrw = &(ba->drr->drr_u.drr_write);
160
161
162 /*
163 * If there is any kind of pending aggregation (currently either
164 * a grouping of free objects or free blocks), push it out to
165 * the stream, since aggregation can't be done across operations
166 * of different types.
167 */
168 if (ba->pending_op != PENDING_NONE) {
169 if (dump_bytes(ba, ba->drr, sizeof (dmu_replay_record_t)) != 0)
170 return (EINTR);
171 ba->pending_op = PENDING_NONE;
172 }
173 /* write a DATA record */
174 bzero(ba->drr, sizeof (dmu_replay_record_t));
175 ba->drr->drr_type = DRR_WRITE;
176 drrw->drr_object = object;
177 drrw->drr_type = type;
178 drrw->drr_offset = offset;
179 drrw->drr_length = blksz;
180 drrw->drr_toguid = ba->toguid;
181 drrw->drr_checksumtype = BP_GET_CHECKSUM(bp);
182 if (zio_checksum_table[drrw->drr_checksumtype].ci_dedup)
183 drrw->drr_checksumflags |= DRR_CHECKSUM_DEDUP;
184 DDK_SET_LSIZE(&drrw->drr_key, BP_GET_LSIZE(bp));
185 DDK_SET_PSIZE(&drrw->drr_key, BP_GET_PSIZE(bp));
186 DDK_SET_COMPRESS(&drrw->drr_key, BP_GET_COMPRESS(bp));
187 drrw->drr_key.ddk_cksum = bp->blk_cksum;
188
189 if (dump_bytes(ba, ba->drr, sizeof (dmu_replay_record_t)) != 0)
190 return (EINTR);
191 if (dump_bytes(ba, data, blksz) != 0)
192 return (EINTR);
193 return (0);
194 }
195
196 static int
197 dump_spill(struct backuparg *ba, uint64_t object, int blksz, void *data)
198 {
199 struct drr_spill *drrs = &(ba->drr->drr_u.drr_spill);
200
201 if (ba->pending_op != PENDING_NONE) {
202 if (dump_bytes(ba, ba->drr, sizeof (dmu_replay_record_t)) != 0)
203 return (EINTR);
204 ba->pending_op = PENDING_NONE;
205 }
206
207 /* write a SPILL record */
208 bzero(ba->drr, sizeof (dmu_replay_record_t));
209 ba->drr->drr_type = DRR_SPILL;
210 drrs->drr_object = object;
211 drrs->drr_length = blksz;
212 drrs->drr_toguid = ba->toguid;
213
214 if (dump_bytes(ba, ba->drr, sizeof (dmu_replay_record_t)))
215 return (EINTR);
216 if (dump_bytes(ba, data, blksz))
217 return (EINTR);
218 return (0);
219 }
220
221 static int
222 dump_freeobjects(struct backuparg *ba, uint64_t firstobj, uint64_t numobjs)
223 {
224 struct drr_freeobjects *drrfo = &(ba->drr->drr_u.drr_freeobjects);
225
226 /*
227 * If there is a pending op, but it's not PENDING_FREEOBJECTS,
228 * push it out, since free block aggregation can only be done for
229 * blocks of the same type (i.e., DRR_FREE records can only be
230 * aggregated with other DRR_FREE records. DRR_FREEOBJECTS records
231 * can only be aggregated with other DRR_FREEOBJECTS records.
232 */
233 if (ba->pending_op != PENDING_NONE &&
234 ba->pending_op != PENDING_FREEOBJECTS) {
235 if (dump_bytes(ba, ba->drr, sizeof (dmu_replay_record_t)) != 0)
236 return (EINTR);
237 ba->pending_op = PENDING_NONE;
238 }
239 if (ba->pending_op == PENDING_FREEOBJECTS) {
240 /*
241 * See whether this free object array can be aggregated
242 * with pending one
243 */
244 if (drrfo->drr_firstobj + drrfo->drr_numobjs == firstobj) {
245 drrfo->drr_numobjs += numobjs;
246 return (0);
247 } else {
248 /* can't be aggregated. Push out pending record */
249 if (dump_bytes(ba, ba->drr,
250 sizeof (dmu_replay_record_t)) != 0)
251 return (EINTR);
252 ba->pending_op = PENDING_NONE;
253 }
254 }
255
256 /* write a FREEOBJECTS record */
257 bzero(ba->drr, sizeof (dmu_replay_record_t));
258 ba->drr->drr_type = DRR_FREEOBJECTS;
259 drrfo->drr_firstobj = firstobj;
260 drrfo->drr_numobjs = numobjs;
261 drrfo->drr_toguid = ba->toguid;
262
263 ba->pending_op = PENDING_FREEOBJECTS;
264
265 return (0);
266 }
267
268 static int
269 dump_dnode(struct backuparg *ba, uint64_t object, dnode_phys_t *dnp)
270 {
271 struct drr_object *drro = &(ba->drr->drr_u.drr_object);
272
273 if (dnp == NULL || dnp->dn_type == DMU_OT_NONE)
274 return (dump_freeobjects(ba, object, 1));
275
276 if (ba->pending_op != PENDING_NONE) {
277 if (dump_bytes(ba, ba->drr, sizeof (dmu_replay_record_t)) != 0)
278 return (EINTR);
279 ba->pending_op = PENDING_NONE;
280 }
281
282 /* write an OBJECT record */
283 bzero(ba->drr, sizeof (dmu_replay_record_t));
284 ba->drr->drr_type = DRR_OBJECT;
285 drro->drr_object = object;
286 drro->drr_type = dnp->dn_type;
287 drro->drr_bonustype = dnp->dn_bonustype;
288 drro->drr_blksz = dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT;
289 drro->drr_bonuslen = dnp->dn_bonuslen;
290 drro->drr_checksumtype = dnp->dn_checksum;
291 drro->drr_compress = dnp->dn_compress;
292 drro->drr_toguid = ba->toguid;
293
294 if (dump_bytes(ba, ba->drr, sizeof (dmu_replay_record_t)) != 0)
295 return (EINTR);
296
297 if (dump_bytes(ba, DN_BONUS(dnp), P2ROUNDUP(dnp->dn_bonuslen, 8)) != 0)
298 return (EINTR);
299
300 /* free anything past the end of the file */
301 if (dump_free(ba, object, (dnp->dn_maxblkid + 1) *
302 (dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT), -1ULL))
303 return (EINTR);
304 if (ba->err)
305 return (EINTR);
306 return (0);
307 }
308
309 #define BP_SPAN(dnp, level) \
310 (((uint64_t)dnp->dn_datablkszsec) << (SPA_MINBLOCKSHIFT + \
311 (level) * (dnp->dn_indblkshift - SPA_BLKPTRSHIFT)))
312
313 /* ARGSUSED */
314 static int
315 backup_cb(spa_t *spa, zilog_t *zilog, const blkptr_t *bp, arc_buf_t *pbuf,
316 const zbookmark_t *zb, const dnode_phys_t *dnp, void *arg)
317 {
318 struct backuparg *ba = arg;
319 dmu_object_type_t type = bp ? BP_GET_TYPE(bp) : DMU_OT_NONE;
320 int err = 0;
321
322 if (issig(JUSTLOOKING) && issig(FORREAL))
323 return (EINTR);
324
325 if (zb->zb_object != DMU_META_DNODE_OBJECT &&
326 DMU_OBJECT_IS_SPECIAL(zb->zb_object)) {
327 return (0);
328 } else if (bp == NULL && zb->zb_object == DMU_META_DNODE_OBJECT) {
329 uint64_t span = BP_SPAN(dnp, zb->zb_level);
330 uint64_t dnobj = (zb->zb_blkid * span) >> DNODE_SHIFT;
331 err = dump_freeobjects(ba, dnobj, span >> DNODE_SHIFT);
332 } else if (bp == NULL) {
333 uint64_t span = BP_SPAN(dnp, zb->zb_level);
334 err = dump_free(ba, zb->zb_object, zb->zb_blkid * span, span);
335 } else if (zb->zb_level > 0 || type == DMU_OT_OBJSET) {
336 return (0);
337 } else if (type == DMU_OT_DNODE) {
338 dnode_phys_t *blk;
339 int i;
340 int blksz = BP_GET_LSIZE(bp);
341 uint32_t aflags = ARC_WAIT;
342 arc_buf_t *abuf;
343
344 if (dsl_read(NULL, spa, bp, pbuf,
345 arc_getbuf_func, &abuf, ZIO_PRIORITY_ASYNC_READ,
346 ZIO_FLAG_CANFAIL, &aflags, zb) != 0)
347 return (EIO);
348
349 blk = abuf->b_data;
350 for (i = 0; i < blksz >> DNODE_SHIFT; i++) {
351 uint64_t dnobj = (zb->zb_blkid <<
352 (DNODE_BLOCK_SHIFT - DNODE_SHIFT)) + i;
353 err = dump_dnode(ba, dnobj, blk+i);
354 if (err)
355 break;
356 }
357 (void) arc_buf_remove_ref(abuf, &abuf);
358 } else if (type == DMU_OT_SA) {
359 uint32_t aflags = ARC_WAIT;
360 arc_buf_t *abuf;
361 int blksz = BP_GET_LSIZE(bp);
362
363 if (arc_read_nolock(NULL, spa, bp,
364 arc_getbuf_func, &abuf, ZIO_PRIORITY_ASYNC_READ,
365 ZIO_FLAG_CANFAIL, &aflags, zb) != 0)
366 return (EIO);
367
368 err = dump_spill(ba, zb->zb_object, blksz, abuf->b_data);
369 (void) arc_buf_remove_ref(abuf, &abuf);
370 } else { /* it's a level-0 block of a regular object */
371 uint32_t aflags = ARC_WAIT;
372 arc_buf_t *abuf;
373 int blksz = BP_GET_LSIZE(bp);
374
375 if (dsl_read(NULL, spa, bp, pbuf,
376 arc_getbuf_func, &abuf, ZIO_PRIORITY_ASYNC_READ,
377 ZIO_FLAG_CANFAIL, &aflags, zb) != 0) {
378 if (zfs_send_corrupt_data) {
379 uint64_t *ptr;
380 /* Send a block filled with 0x"zfs badd bloc" */
381 abuf = arc_buf_alloc(spa, blksz, &abuf,
382 ARC_BUFC_DATA);
383 for (ptr = abuf->b_data;
384 (char *)ptr < (char *)abuf->b_data + blksz;
385 ptr++)
386 *ptr = 0x2f5baddb10c;
387 } else {
388 return (EIO);
389 }
390 }
391
392 err = dump_data(ba, type, zb->zb_object, zb->zb_blkid * blksz,
393 blksz, bp, abuf->b_data);
394 (void) arc_buf_remove_ref(abuf, &abuf);
395 }
396
397 ASSERT(err == 0 || err == EINTR);
398 return (err);
399 }
400
401 int
402 dmu_sendbackup(objset_t *tosnap, objset_t *fromsnap, boolean_t fromorigin,
403 vnode_t *vp, offset_t *off)
404 {
405 dsl_dataset_t *ds = tosnap->os_dsl_dataset;
406 dsl_dataset_t *fromds = fromsnap ? fromsnap->os_dsl_dataset : NULL;
407 dmu_replay_record_t *drr;
408 struct backuparg ba;
409 int err;
410 uint64_t fromtxg = 0;
411
412 /* tosnap must be a snapshot */
413 if (ds->ds_phys->ds_next_snap_obj == 0)
414 return (EINVAL);
415
416 /* fromsnap must be an earlier snapshot from the same fs as tosnap */
417 if (fromds && (ds->ds_dir != fromds->ds_dir ||
418 fromds->ds_phys->ds_creation_txg >= ds->ds_phys->ds_creation_txg))
419 return (EXDEV);
420
421 if (fromorigin) {
422 dsl_pool_t *dp = ds->ds_dir->dd_pool;
423
424 if (fromsnap)
425 return (EINVAL);
426
427 if (dsl_dir_is_clone(ds->ds_dir)) {
428 rw_enter(&dp->dp_config_rwlock, RW_READER);
429 err = dsl_dataset_hold_obj(dp,
430 ds->ds_dir->dd_phys->dd_origin_obj, FTAG, &fromds);
431 rw_exit(&dp->dp_config_rwlock);
432 if (err)
433 return (err);
434 } else {
435 fromorigin = B_FALSE;
436 }
437 }
438
439
440 drr = kmem_zalloc(sizeof (dmu_replay_record_t), KM_SLEEP);
441 drr->drr_type = DRR_BEGIN;
442 drr->drr_u.drr_begin.drr_magic = DMU_BACKUP_MAGIC;
443 DMU_SET_STREAM_HDRTYPE(drr->drr_u.drr_begin.drr_versioninfo,
444 DMU_SUBSTREAM);
445
446 #ifdef _KERNEL
447 if (dmu_objset_type(tosnap) == DMU_OST_ZFS) {
448 uint64_t version;
449 if (zfs_get_zplprop(tosnap, ZFS_PROP_VERSION, &version) != 0)
450 return (EINVAL);
451 if (version == ZPL_VERSION_SA) {
452 DMU_SET_FEATUREFLAGS(
453 drr->drr_u.drr_begin.drr_versioninfo,
454 DMU_BACKUP_FEATURE_SA_SPILL);
455 }
456 }
457 #endif
458
459 drr->drr_u.drr_begin.drr_creation_time =
460 ds->ds_phys->ds_creation_time;
461 drr->drr_u.drr_begin.drr_type = tosnap->os_phys->os_type;
462 if (fromorigin)
463 drr->drr_u.drr_begin.drr_flags |= DRR_FLAG_CLONE;
464 drr->drr_u.drr_begin.drr_toguid = ds->ds_phys->ds_guid;
465 if (ds->ds_phys->ds_flags & DS_FLAG_CI_DATASET)
466 drr->drr_u.drr_begin.drr_flags |= DRR_FLAG_CI_DATA;
467
468 if (fromds)
469 drr->drr_u.drr_begin.drr_fromguid = fromds->ds_phys->ds_guid;
470 dsl_dataset_name(ds, drr->drr_u.drr_begin.drr_toname);
471
472 if (fromds)
473 fromtxg = fromds->ds_phys->ds_creation_txg;
474 if (fromorigin)
475 dsl_dataset_rele(fromds, FTAG);
476
477 ba.drr = drr;
478 ba.vp = vp;
479 ba.os = tosnap;
480 ba.off = off;
481 ba.toguid = ds->ds_phys->ds_guid;
482 ZIO_SET_CHECKSUM(&ba.zc, 0, 0, 0, 0);
483 ba.pending_op = PENDING_NONE;
484
485 if (dump_bytes(&ba, drr, sizeof (dmu_replay_record_t)) != 0) {
486 kmem_free(drr, sizeof (dmu_replay_record_t));
487 return (ba.err);
488 }
489
490 err = traverse_dataset(ds, fromtxg, TRAVERSE_PRE | TRAVERSE_PREFETCH,
491 backup_cb, &ba);
492
493 if (ba.pending_op != PENDING_NONE)
494 if (dump_bytes(&ba, drr, sizeof (dmu_replay_record_t)) != 0)
495 err = EINTR;
496
497 if (err) {
498 if (err == EINTR && ba.err)
499 err = ba.err;
500 kmem_free(drr, sizeof (dmu_replay_record_t));
501 return (err);
502 }
503
504 bzero(drr, sizeof (dmu_replay_record_t));
505 drr->drr_type = DRR_END;
506 drr->drr_u.drr_end.drr_checksum = ba.zc;
507 drr->drr_u.drr_end.drr_toguid = ba.toguid;
508
509 if (dump_bytes(&ba, drr, sizeof (dmu_replay_record_t)) != 0) {
510 kmem_free(drr, sizeof (dmu_replay_record_t));
511 return (ba.err);
512 }
513
514 kmem_free(drr, sizeof (dmu_replay_record_t));
515
516 return (0);
517 }
518
519 int
520 dmu_send_estimate(objset_t *tosnap, objset_t *fromsnap, boolean_t fromorigin,
521 uint64_t *sizep)
522 {
523 dsl_dataset_t *ds = tosnap->os_dsl_dataset;
524 dsl_dataset_t *fromds = fromsnap ? fromsnap->os_dsl_dataset : NULL;
525 dsl_pool_t *dp = ds->ds_dir->dd_pool;
526 int err;
527 uint64_t size, recordsize;
528
529 /* tosnap must be a snapshot */
530 if (ds->ds_phys->ds_next_snap_obj == 0)
531 return (EINVAL);
532
533 /* fromsnap must be an earlier snapshot from the same fs as tosnap */
534 if (fromds && (ds->ds_dir != fromds->ds_dir ||
535 fromds->ds_phys->ds_creation_txg >= ds->ds_phys->ds_creation_txg))
536 return (EXDEV);
537
538 if (fromorigin) {
539 if (fromsnap)
540 return (EINVAL);
541
542 if (dsl_dir_is_clone(ds->ds_dir)) {
543 rw_enter(&dp->dp_config_rwlock, RW_READER);
544 err = dsl_dataset_hold_obj(dp,
545 ds->ds_dir->dd_phys->dd_origin_obj, FTAG, &fromds);
546 rw_exit(&dp->dp_config_rwlock);
547 if (err)
548 return (err);
549 } else {
550 fromorigin = B_FALSE;
551 }
552 }
553
554 /* Get uncompressed size estimate of changed data. */
555 if (fromds == NULL) {
556 size = ds->ds_phys->ds_uncompressed_bytes;
557 } else {
558 uint64_t used, comp;
559 err = dsl_dataset_space_written(fromds, ds,
560 &used, &comp, &size);
561 if (fromorigin)
562 dsl_dataset_rele(fromds, FTAG);
563 if (err)
564 return (err);
565 }
566
567 /*
568 * Assume that space (both on-disk and in-stream) is dominated by
569 * data. We will adjust for indirect blocks and the copies property,
570 * but ignore per-object space used (eg, dnodes and DRR_OBJECT records).
571 */
572
573 /*
574 * Subtract out approximate space used by indirect blocks.
575 * Assume most space is used by data blocks (non-indirect, non-dnode).
576 * Assume all blocks are recordsize. Assume ditto blocks and
577 * internal fragmentation counter out compression.
578 *
579 * Therefore, space used by indirect blocks is sizeof(blkptr_t) per
580 * block, which we observe in practice.
581 */
582 rw_enter(&dp->dp_config_rwlock, RW_READER);
583 err = dsl_prop_get_ds(ds, "recordsize",
584 sizeof (recordsize), 1, &recordsize, NULL);
585 rw_exit(&dp->dp_config_rwlock);
586 if (err)
587 return (err);
588 size -= size / recordsize * sizeof (blkptr_t);
589
590 /* Add in the space for the record associated with each block. */
591 size += size / recordsize * sizeof (dmu_replay_record_t);
592
593 *sizep = size;
594
595 return (0);
596 }
597
598 struct recvbeginsyncarg {
599 const char *tofs;
600 const char *tosnap;
601 dsl_dataset_t *origin;
602 uint64_t fromguid;
603 dmu_objset_type_t type;
604 void *tag;
605 boolean_t force;
606 uint64_t dsflags;
607 char clonelastname[MAXNAMELEN];
608 dsl_dataset_t *ds; /* the ds to recv into; returned from the syncfunc */
609 cred_t *cr;
610 };
611
612 /* ARGSUSED */
613 static int
614 recv_new_check(void *arg1, void *arg2, dmu_tx_t *tx)
615 {
616 dsl_dir_t *dd = arg1;
617 struct recvbeginsyncarg *rbsa = arg2;
618 objset_t *mos = dd->dd_pool->dp_meta_objset;
619 uint64_t val;
620 int err;
621
622 err = zap_lookup(mos, dd->dd_phys->dd_child_dir_zapobj,
623 strrchr(rbsa->tofs, '/') + 1, sizeof (uint64_t), 1, &val);
624
625 if (err != ENOENT)
626 return (err ? err : EEXIST);
627
628 if (rbsa->origin) {
629 /* make sure it's a snap in the same pool */
630 if (rbsa->origin->ds_dir->dd_pool != dd->dd_pool)
631 return (EXDEV);
632 if (!dsl_dataset_is_snapshot(rbsa->origin))
633 return (EINVAL);
634 if (rbsa->origin->ds_phys->ds_guid != rbsa->fromguid)
635 return (ENODEV);
636 }
637
638 return (0);
639 }
640
641 static void
642 recv_new_sync(void *arg1, void *arg2, dmu_tx_t *tx)
643 {
644 dsl_dir_t *dd = arg1;
645 struct recvbeginsyncarg *rbsa = arg2;
646 uint64_t flags = DS_FLAG_INCONSISTENT | rbsa->dsflags;
647 uint64_t dsobj;
648
649 /* Create and open new dataset. */
650 dsobj = dsl_dataset_create_sync(dd, strrchr(rbsa->tofs, '/') + 1,
651 rbsa->origin, flags, rbsa->cr, tx);
652 VERIFY(0 == dsl_dataset_own_obj(dd->dd_pool, dsobj,
653 B_TRUE, dmu_recv_tag, &rbsa->ds));
654
655 if (rbsa->origin == NULL) {
656 (void) dmu_objset_create_impl(dd->dd_pool->dp_spa,
657 rbsa->ds, &rbsa->ds->ds_phys->ds_bp, rbsa->type, tx);
658 }
659
660 spa_history_log_internal(LOG_DS_REPLAY_FULL_SYNC,
661 dd->dd_pool->dp_spa, tx, "dataset = %lld", dsobj);
662 }
663
664 /* ARGSUSED */
665 static int
666 recv_existing_check(void *arg1, void *arg2, dmu_tx_t *tx)
667 {
668 dsl_dataset_t *ds = arg1;
669 struct recvbeginsyncarg *rbsa = arg2;
670 int err;
671 uint64_t val;
672
673 /* must not have any changes since most recent snapshot */
674 if (!rbsa->force && dsl_dataset_modified_since_lastsnap(ds))
675 return (ETXTBSY);
676
677 /* new snapshot name must not exist */
678 err = zap_lookup(ds->ds_dir->dd_pool->dp_meta_objset,
679 ds->ds_phys->ds_snapnames_zapobj, rbsa->tosnap, 8, 1, &val);
680 if (err == 0)
681 return (EEXIST);
682 if (err != ENOENT)
683 return (err);
684
685 if (rbsa->fromguid) {
686 /* if incremental, most recent snapshot must match fromguid */
687 if (ds->ds_prev == NULL)
688 return (ENODEV);
689
690 /*
691 * most recent snapshot must match fromguid, or there are no
692 * changes since the fromguid one
693 */
694 if (ds->ds_prev->ds_phys->ds_guid != rbsa->fromguid) {
695 uint64_t birth = ds->ds_prev->ds_phys->ds_bp.blk_birth;
696 uint64_t obj = ds->ds_prev->ds_phys->ds_prev_snap_obj;
697 while (obj != 0) {
698 dsl_dataset_t *snap;
699 err = dsl_dataset_hold_obj(ds->ds_dir->dd_pool,
700 obj, FTAG, &snap);
701 if (err)
702 return (ENODEV);
703 if (snap->ds_phys->ds_creation_txg < birth) {
704 dsl_dataset_rele(snap, FTAG);
705 return (ENODEV);
706 }
707 if (snap->ds_phys->ds_guid == rbsa->fromguid) {
708 dsl_dataset_rele(snap, FTAG);
709 break; /* it's ok */
710 }
711 obj = snap->ds_phys->ds_prev_snap_obj;
712 dsl_dataset_rele(snap, FTAG);
713 }
714 if (obj == 0)
715 return (ENODEV);
716 }
717 } else {
718 /* if full, most recent snapshot must be $ORIGIN */
719 if (ds->ds_phys->ds_prev_snap_txg >= TXG_INITIAL)
720 return (ENODEV);
721 }
722
723 /* temporary clone name must not exist */
724 err = zap_lookup(ds->ds_dir->dd_pool->dp_meta_objset,
725 ds->ds_dir->dd_phys->dd_child_dir_zapobj,
726 rbsa->clonelastname, 8, 1, &val);
727 if (err == 0)
728 return (EEXIST);
729 if (err != ENOENT)
730 return (err);
731
732 return (0);
733 }
734
735 /* ARGSUSED */
736 static void
737 recv_existing_sync(void *arg1, void *arg2, dmu_tx_t *tx)
738 {
739 dsl_dataset_t *ohds = arg1;
740 struct recvbeginsyncarg *rbsa = arg2;
741 dsl_pool_t *dp = ohds->ds_dir->dd_pool;
742 dsl_dataset_t *cds;
743 uint64_t flags = DS_FLAG_INCONSISTENT | rbsa->dsflags;
744 uint64_t dsobj;
745
746 /* create and open the temporary clone */
747 dsobj = dsl_dataset_create_sync(ohds->ds_dir, rbsa->clonelastname,
748 ohds->ds_prev, flags, rbsa->cr, tx);
749 VERIFY(0 == dsl_dataset_own_obj(dp, dsobj, B_TRUE, dmu_recv_tag, &cds));
750
751 /*
752 * If we actually created a non-clone, we need to create the
753 * objset in our new dataset.
754 */
755 if (BP_IS_HOLE(dsl_dataset_get_blkptr(cds))) {
756 (void) dmu_objset_create_impl(dp->dp_spa,
757 cds, dsl_dataset_get_blkptr(cds), rbsa->type, tx);
758 }
759
760 rbsa->ds = cds;
761
762 spa_history_log_internal(LOG_DS_REPLAY_INC_SYNC,
763 dp->dp_spa, tx, "dataset = %lld", dsobj);
764 }
765
766 static boolean_t
767 dmu_recv_verify_features(dsl_dataset_t *ds, struct drr_begin *drrb)
768 {
769 int featureflags;
770
771 featureflags = DMU_GET_FEATUREFLAGS(drrb->drr_versioninfo);
772
773 /* Verify pool version supports SA if SA_SPILL feature set */
774 return ((featureflags & DMU_BACKUP_FEATURE_SA_SPILL) &&
775 (spa_version(dsl_dataset_get_spa(ds)) < SPA_VERSION_SA));
776 }
777
778 /*
779 * NB: callers *MUST* call dmu_recv_stream() if dmu_recv_begin()
780 * succeeds; otherwise we will leak the holds on the datasets.
781 */
782 int
783 dmu_recv_begin(char *tofs, char *tosnap, char *top_ds, struct drr_begin *drrb,
784 boolean_t force, objset_t *origin, dmu_recv_cookie_t *drc)
785 {
786 int err = 0;
787 boolean_t byteswap;
788 struct recvbeginsyncarg rbsa = { 0 };
789 uint64_t versioninfo;
790 int flags;
791 dsl_dataset_t *ds;
792
793 if (drrb->drr_magic == DMU_BACKUP_MAGIC)
794 byteswap = FALSE;
795 else if (drrb->drr_magic == BSWAP_64(DMU_BACKUP_MAGIC))
796 byteswap = TRUE;
797 else
798 return (EINVAL);
799
800 rbsa.tofs = tofs;
801 rbsa.tosnap = tosnap;
802 rbsa.origin = origin ? origin->os_dsl_dataset : NULL;
803 rbsa.fromguid = drrb->drr_fromguid;
804 rbsa.type = drrb->drr_type;
805 rbsa.tag = FTAG;
806 rbsa.dsflags = 0;
807 rbsa.cr = CRED();
808 versioninfo = drrb->drr_versioninfo;
809 flags = drrb->drr_flags;
810
811 if (byteswap) {
812 rbsa.type = BSWAP_32(rbsa.type);
813 rbsa.fromguid = BSWAP_64(rbsa.fromguid);
814 versioninfo = BSWAP_64(versioninfo);
815 flags = BSWAP_32(flags);
816 }
817
818 if (DMU_GET_STREAM_HDRTYPE(versioninfo) == DMU_COMPOUNDSTREAM ||
819 rbsa.type >= DMU_OST_NUMTYPES ||
820 ((flags & DRR_FLAG_CLONE) && origin == NULL))
821 return (EINVAL);
822
823 if (flags & DRR_FLAG_CI_DATA)
824 rbsa.dsflags = DS_FLAG_CI_DATASET;
825
826 bzero(drc, sizeof (dmu_recv_cookie_t));
827 drc->drc_drrb = drrb;
828 drc->drc_tosnap = tosnap;
829 drc->drc_top_ds = top_ds;
830 drc->drc_force = force;
831
832 /*
833 * Process the begin in syncing context.
834 */
835
836 /* open the dataset we are logically receiving into */
837 err = dsl_dataset_hold(tofs, dmu_recv_tag, &ds);
838 if (err == 0) {
839 if (dmu_recv_verify_features(ds, drrb)) {
840 dsl_dataset_rele(ds, dmu_recv_tag);
841 return (ENOTSUP);
842 }
843 /* target fs already exists; recv into temp clone */
844
845 /* Can't recv a clone into an existing fs */
846 if (flags & DRR_FLAG_CLONE) {
847 dsl_dataset_rele(ds, dmu_recv_tag);
848 return (EINVAL);
849 }
850
851 /* must not have an incremental recv already in progress */
852 if (!mutex_tryenter(&ds->ds_recvlock)) {
853 dsl_dataset_rele(ds, dmu_recv_tag);
854 return (EBUSY);
855 }
856
857 /* tmp clone name is: tofs/%tosnap" */
858 (void) snprintf(rbsa.clonelastname, sizeof (rbsa.clonelastname),
859 "%%%s", tosnap);
860 rbsa.force = force;
861 err = dsl_sync_task_do(ds->ds_dir->dd_pool,
862 recv_existing_check, recv_existing_sync, ds, &rbsa, 5);
863 if (err) {
864 mutex_exit(&ds->ds_recvlock);
865 dsl_dataset_rele(ds, dmu_recv_tag);
866 return (err);
867 }
868 drc->drc_logical_ds = ds;
869 drc->drc_real_ds = rbsa.ds;
870 } else if (err == ENOENT) {
871 /* target fs does not exist; must be a full backup or clone */
872 char *cp;
873
874 /*
875 * If it's a non-clone incremental, we are missing the
876 * target fs, so fail the recv.
877 */
878 if (rbsa.fromguid && !(flags & DRR_FLAG_CLONE))
879 return (ENOENT);
880
881 /* Open the parent of tofs */
882 cp = strrchr(tofs, '/');
883 *cp = '\0';
884 err = dsl_dataset_hold(tofs, FTAG, &ds);
885 *cp = '/';
886 if (err)
887 return (err);
888
889 if (dmu_recv_verify_features(ds, drrb)) {
890 dsl_dataset_rele(ds, FTAG);
891 return (ENOTSUP);
892 }
893
894 err = dsl_sync_task_do(ds->ds_dir->dd_pool,
895 recv_new_check, recv_new_sync, ds->ds_dir, &rbsa, 5);
896 dsl_dataset_rele(ds, FTAG);
897 if (err)
898 return (err);
899 drc->drc_logical_ds = drc->drc_real_ds = rbsa.ds;
900 drc->drc_newfs = B_TRUE;
901 }
902
903 return (err);
904 }
905
906 struct restorearg {
907 int err;
908 int byteswap;
909 vnode_t *vp;
910 char *buf;
911 uint64_t voff;
912 int bufsize; /* amount of memory allocated for buf */
913 zio_cksum_t cksum;
914 avl_tree_t *guid_to_ds_map;
915 };
916
917 typedef struct guid_map_entry {
918 uint64_t guid;
919 dsl_dataset_t *gme_ds;
920 avl_node_t avlnode;
921 } guid_map_entry_t;
922
923 static int
924 guid_compare(const void *arg1, const void *arg2)
925 {
926 const guid_map_entry_t *gmep1 = arg1;
927 const guid_map_entry_t *gmep2 = arg2;
928
929 if (gmep1->guid < gmep2->guid)
930 return (-1);
931 else if (gmep1->guid > gmep2->guid)
932 return (1);
933 return (0);
934 }
935
936 static void
937 free_guid_map_onexit(void *arg)
938 {
939 avl_tree_t *ca = arg;
940 void *cookie = NULL;
941 guid_map_entry_t *gmep;
942
943 while ((gmep = avl_destroy_nodes(ca, &cookie)) != NULL) {
944 dsl_dataset_rele(gmep->gme_ds, ca);
945 kmem_free(gmep, sizeof (guid_map_entry_t));
946 }
947 avl_destroy(ca);
948 kmem_free(ca, sizeof (avl_tree_t));
949 }
950
951 static void *
952 restore_read(struct restorearg *ra, int len)
953 {
954 void *rv;
955 int done = 0;
956
957 /* some things will require 8-byte alignment, so everything must */
958 ASSERT3U(len % 8, ==, 0);
959
960 while (done < len) {
961 ssize_t resid;
962
963 ra->err = vn_rdwr(UIO_READ, ra->vp,
964 (caddr_t)ra->buf + done, len - done,
965 ra->voff, UIO_SYSSPACE, FAPPEND,
966 RLIM64_INFINITY, CRED(), &resid);
967
968 if (resid == len - done)
969 ra->err = EINVAL;
970 ra->voff += len - done - resid;
971 done = len - resid;
972 if (ra->err)
973 return (NULL);
974 }
975
976 ASSERT3U(done, ==, len);
977 rv = ra->buf;
978 if (ra->byteswap)
979 fletcher_4_incremental_byteswap(rv, len, &ra->cksum);
980 else
981 fletcher_4_incremental_native(rv, len, &ra->cksum);
982 return (rv);
983 }
984
985 noinline static void
986 backup_byteswap(dmu_replay_record_t *drr)
987 {
988 #define DO64(X) (drr->drr_u.X = BSWAP_64(drr->drr_u.X))
989 #define DO32(X) (drr->drr_u.X = BSWAP_32(drr->drr_u.X))
990 drr->drr_type = BSWAP_32(drr->drr_type);
991 drr->drr_payloadlen = BSWAP_32(drr->drr_payloadlen);
992 switch (drr->drr_type) {
993 case DRR_BEGIN:
994 DO64(drr_begin.drr_magic);
995 DO64(drr_begin.drr_versioninfo);
996 DO64(drr_begin.drr_creation_time);
997 DO32(drr_begin.drr_type);
998 DO32(drr_begin.drr_flags);
999 DO64(drr_begin.drr_toguid);
1000 DO64(drr_begin.drr_fromguid);
1001 break;
1002 case DRR_OBJECT:
1003 DO64(drr_object.drr_object);
1004 /* DO64(drr_object.drr_allocation_txg); */
1005 DO32(drr_object.drr_type);
1006 DO32(drr_object.drr_bonustype);
1007 DO32(drr_object.drr_blksz);
1008 DO32(drr_object.drr_bonuslen);
1009 DO64(drr_object.drr_toguid);
1010 break;
1011 case DRR_FREEOBJECTS:
1012 DO64(drr_freeobjects.drr_firstobj);
1013 DO64(drr_freeobjects.drr_numobjs);
1014 DO64(drr_freeobjects.drr_toguid);
1015 break;
1016 case DRR_WRITE:
1017 DO64(drr_write.drr_object);
1018 DO32(drr_write.drr_type);
1019 DO64(drr_write.drr_offset);
1020 DO64(drr_write.drr_length);
1021 DO64(drr_write.drr_toguid);
1022 DO64(drr_write.drr_key.ddk_cksum.zc_word[0]);
1023 DO64(drr_write.drr_key.ddk_cksum.zc_word[1]);
1024 DO64(drr_write.drr_key.ddk_cksum.zc_word[2]);
1025 DO64(drr_write.drr_key.ddk_cksum.zc_word[3]);
1026 DO64(drr_write.drr_key.ddk_prop);
1027 break;
1028 case DRR_WRITE_BYREF:
1029 DO64(drr_write_byref.drr_object);
1030 DO64(drr_write_byref.drr_offset);
1031 DO64(drr_write_byref.drr_length);
1032 DO64(drr_write_byref.drr_toguid);
1033 DO64(drr_write_byref.drr_refguid);
1034 DO64(drr_write_byref.drr_refobject);
1035 DO64(drr_write_byref.drr_refoffset);
1036 DO64(drr_write_byref.drr_key.ddk_cksum.zc_word[0]);
1037 DO64(drr_write_byref.drr_key.ddk_cksum.zc_word[1]);
1038 DO64(drr_write_byref.drr_key.ddk_cksum.zc_word[2]);
1039 DO64(drr_write_byref.drr_key.ddk_cksum.zc_word[3]);
1040 DO64(drr_write_byref.drr_key.ddk_prop);
1041 break;
1042 case DRR_FREE:
1043 DO64(drr_free.drr_object);
1044 DO64(drr_free.drr_offset);
1045 DO64(drr_free.drr_length);
1046 DO64(drr_free.drr_toguid);
1047 break;
1048 case DRR_SPILL:
1049 DO64(drr_spill.drr_object);
1050 DO64(drr_spill.drr_length);
1051 DO64(drr_spill.drr_toguid);
1052 break;
1053 case DRR_END:
1054 DO64(drr_end.drr_checksum.zc_word[0]);
1055 DO64(drr_end.drr_checksum.zc_word[1]);
1056 DO64(drr_end.drr_checksum.zc_word[2]);
1057 DO64(drr_end.drr_checksum.zc_word[3]);
1058 DO64(drr_end.drr_toguid);
1059 break;
1060 default:
1061 break;
1062 }
1063 #undef DO64
1064 #undef DO32
1065 }
1066
1067 noinline static int
1068 restore_object(struct restorearg *ra, objset_t *os, struct drr_object *drro)
1069 {
1070 int err;
1071 dmu_tx_t *tx;
1072 void *data = NULL;
1073
1074 if (drro->drr_type == DMU_OT_NONE ||
1075 drro->drr_type >= DMU_OT_NUMTYPES ||
1076 drro->drr_bonustype >= DMU_OT_NUMTYPES ||
1077 drro->drr_checksumtype >= ZIO_CHECKSUM_FUNCTIONS ||
1078 drro->drr_compress >= ZIO_COMPRESS_FUNCTIONS ||
1079 P2PHASE(drro->drr_blksz, SPA_MINBLOCKSIZE) ||
1080 drro->drr_blksz < SPA_MINBLOCKSIZE ||
1081 drro->drr_blksz > SPA_MAXBLOCKSIZE ||
1082 drro->drr_bonuslen > DN_MAX_BONUSLEN) {
1083 return (EINVAL);
1084 }
1085
1086 err = dmu_object_info(os, drro->drr_object, NULL);
1087
1088 if (err != 0 && err != ENOENT)
1089 return (EINVAL);
1090
1091 if (drro->drr_bonuslen) {
1092 data = restore_read(ra, P2ROUNDUP(drro->drr_bonuslen, 8));
1093 if (ra->err)
1094 return (ra->err);
1095 }
1096
1097 if (err == ENOENT) {
1098 /* currently free, want to be allocated */
1099 tx = dmu_tx_create(os);
1100 dmu_tx_hold_bonus(tx, DMU_NEW_OBJECT);
1101 err = dmu_tx_assign(tx, TXG_WAIT);
1102 if (err) {
1103 dmu_tx_abort(tx);
1104 return (err);
1105 }
1106 err = dmu_object_claim(os, drro->drr_object,
1107 drro->drr_type, drro->drr_blksz,
1108 drro->drr_bonustype, drro->drr_bonuslen, tx);
1109 dmu_tx_commit(tx);
1110 } else {
1111 /* currently allocated, want to be allocated */
1112 err = dmu_object_reclaim(os, drro->drr_object,
1113 drro->drr_type, drro->drr_blksz,
1114 drro->drr_bonustype, drro->drr_bonuslen);
1115 }
1116 if (err) {
1117 return (EINVAL);
1118 }
1119
1120 tx = dmu_tx_create(os);
1121 dmu_tx_hold_bonus(tx, drro->drr_object);
1122 err = dmu_tx_assign(tx, TXG_WAIT);
1123 if (err) {
1124 dmu_tx_abort(tx);
1125 return (err);
1126 }
1127
1128 dmu_object_set_checksum(os, drro->drr_object, drro->drr_checksumtype,
1129 tx);
1130 dmu_object_set_compress(os, drro->drr_object, drro->drr_compress, tx);
1131
1132 if (data != NULL) {
1133 dmu_buf_t *db;
1134
1135 VERIFY(0 == dmu_bonus_hold(os, drro->drr_object, FTAG, &db));
1136 dmu_buf_will_dirty(db, tx);
1137
1138 ASSERT3U(db->db_size, >=, drro->drr_bonuslen);
1139 bcopy(data, db->db_data, drro->drr_bonuslen);
1140 if (ra->byteswap) {
1141 dmu_ot[drro->drr_bonustype].ot_byteswap(db->db_data,
1142 drro->drr_bonuslen);
1143 }
1144 dmu_buf_rele(db, FTAG);
1145 }
1146 dmu_tx_commit(tx);
1147 return (0);
1148 }
1149
1150 /* ARGSUSED */
1151 noinline static int
1152 restore_freeobjects(struct restorearg *ra, objset_t *os,
1153 struct drr_freeobjects *drrfo)
1154 {
1155 uint64_t obj;
1156
1157 if (drrfo->drr_firstobj + drrfo->drr_numobjs < drrfo->drr_firstobj)
1158 return (EINVAL);
1159
1160 for (obj = drrfo->drr_firstobj;
1161 obj < drrfo->drr_firstobj + drrfo->drr_numobjs;
1162 (void) dmu_object_next(os, &obj, FALSE, 0)) {
1163 int err;
1164
1165 if (dmu_object_info(os, obj, NULL) != 0)
1166 continue;
1167
1168 err = dmu_free_object(os, obj);
1169 if (err)
1170 return (err);
1171 }
1172 return (0);
1173 }
1174
1175 noinline static int
1176 restore_write(struct restorearg *ra, objset_t *os,
1177 struct drr_write *drrw)
1178 {
1179 dmu_tx_t *tx;
1180 void *data;
1181 int err;
1182
1183 if (drrw->drr_offset + drrw->drr_length < drrw->drr_offset ||
1184 drrw->drr_type >= DMU_OT_NUMTYPES)
1185 return (EINVAL);
1186
1187 data = restore_read(ra, drrw->drr_length);
1188 if (data == NULL)
1189 return (ra->err);
1190
1191 if (dmu_object_info(os, drrw->drr_object, NULL) != 0)
1192 return (EINVAL);
1193
1194 tx = dmu_tx_create(os);
1195
1196 dmu_tx_hold_write(tx, drrw->drr_object,
1197 drrw->drr_offset, drrw->drr_length);
1198 err = dmu_tx_assign(tx, TXG_WAIT);
1199 if (err) {
1200 dmu_tx_abort(tx);
1201 return (err);
1202 }
1203 if (ra->byteswap)
1204 dmu_ot[drrw->drr_type].ot_byteswap(data, drrw->drr_length);
1205 dmu_write(os, drrw->drr_object,
1206 drrw->drr_offset, drrw->drr_length, data, tx);
1207 dmu_tx_commit(tx);
1208 return (0);
1209 }
1210
1211 /*
1212 * Handle a DRR_WRITE_BYREF record. This record is used in dedup'ed
1213 * streams to refer to a copy of the data that is already on the
1214 * system because it came in earlier in the stream. This function
1215 * finds the earlier copy of the data, and uses that copy instead of
1216 * data from the stream to fulfill this write.
1217 */
1218 static int
1219 restore_write_byref(struct restorearg *ra, objset_t *os,
1220 struct drr_write_byref *drrwbr)
1221 {
1222 dmu_tx_t *tx;
1223 int err;
1224 guid_map_entry_t gmesrch;
1225 guid_map_entry_t *gmep;
1226 avl_index_t where;
1227 objset_t *ref_os = NULL;
1228 dmu_buf_t *dbp;
1229
1230 if (drrwbr->drr_offset + drrwbr->drr_length < drrwbr->drr_offset)
1231 return (EINVAL);
1232
1233 /*
1234 * If the GUID of the referenced dataset is different from the
1235 * GUID of the target dataset, find the referenced dataset.
1236 */
1237 if (drrwbr->drr_toguid != drrwbr->drr_refguid) {
1238 gmesrch.guid = drrwbr->drr_refguid;
1239 if ((gmep = avl_find(ra->guid_to_ds_map, &gmesrch,
1240 &where)) == NULL) {
1241 return (EINVAL);
1242 }
1243 if (dmu_objset_from_ds(gmep->gme_ds, &ref_os))
1244 return (EINVAL);
1245 } else {
1246 ref_os = os;
1247 }
1248
1249 err = dmu_buf_hold(ref_os, drrwbr->drr_refobject,
1250 drrwbr->drr_refoffset, FTAG, &dbp, DMU_READ_PREFETCH);
1251 if (err)
1252 return (err);
1253
1254 tx = dmu_tx_create(os);
1255
1256 dmu_tx_hold_write(tx, drrwbr->drr_object,
1257 drrwbr->drr_offset, drrwbr->drr_length);
1258 err = dmu_tx_assign(tx, TXG_WAIT);
1259 if (err) {
1260 dmu_tx_abort(tx);
1261 return (err);
1262 }
1263 dmu_write(os, drrwbr->drr_object,
1264 drrwbr->drr_offset, drrwbr->drr_length, dbp->db_data, tx);
1265 dmu_buf_rele(dbp, FTAG);
1266 dmu_tx_commit(tx);
1267 return (0);
1268 }
1269
1270 static int
1271 restore_spill(struct restorearg *ra, objset_t *os, struct drr_spill *drrs)
1272 {
1273 dmu_tx_t *tx;
1274 void *data;
1275 dmu_buf_t *db, *db_spill;
1276 int err;
1277
1278 if (drrs->drr_length < SPA_MINBLOCKSIZE ||
1279 drrs->drr_length > SPA_MAXBLOCKSIZE)
1280 return (EINVAL);
1281
1282 data = restore_read(ra, drrs->drr_length);
1283 if (data == NULL)
1284 return (ra->err);
1285
1286 if (dmu_object_info(os, drrs->drr_object, NULL) != 0)
1287 return (EINVAL);
1288
1289 VERIFY(0 == dmu_bonus_hold(os, drrs->drr_object, FTAG, &db));
1290 if ((err = dmu_spill_hold_by_bonus(db, FTAG, &db_spill)) != 0) {
1291 dmu_buf_rele(db, FTAG);
1292 return (err);
1293 }
1294
1295 tx = dmu_tx_create(os);
1296
1297 dmu_tx_hold_spill(tx, db->db_object);
1298
1299 err = dmu_tx_assign(tx, TXG_WAIT);
1300 if (err) {
1301 dmu_buf_rele(db, FTAG);
1302 dmu_buf_rele(db_spill, FTAG);
1303 dmu_tx_abort(tx);
1304 return (err);
1305 }
1306 dmu_buf_will_dirty(db_spill, tx);
1307
1308 if (db_spill->db_size < drrs->drr_length)
1309 VERIFY(0 == dbuf_spill_set_blksz(db_spill,
1310 drrs->drr_length, tx));
1311 bcopy(data, db_spill->db_data, drrs->drr_length);
1312
1313 dmu_buf_rele(db, FTAG);
1314 dmu_buf_rele(db_spill, FTAG);
1315
1316 dmu_tx_commit(tx);
1317 return (0);
1318 }
1319
1320 /* ARGSUSED */
1321 noinline static int
1322 restore_free(struct restorearg *ra, objset_t *os,
1323 struct drr_free *drrf)
1324 {
1325 int err;
1326
1327 if (drrf->drr_length != -1ULL &&
1328 drrf->drr_offset + drrf->drr_length < drrf->drr_offset)
1329 return (EINVAL);
1330
1331 if (dmu_object_info(os, drrf->drr_object, NULL) != 0)
1332 return (EINVAL);
1333
1334 err = dmu_free_long_range(os, drrf->drr_object,
1335 drrf->drr_offset, drrf->drr_length);
1336 return (err);
1337 }
1338
1339 /*
1340 * NB: callers *must* call dmu_recv_end() if this succeeds.
1341 */
1342 int
1343 dmu_recv_stream(dmu_recv_cookie_t *drc, vnode_t *vp, offset_t *voffp,
1344 int cleanup_fd, uint64_t *action_handlep)
1345 {
1346 struct restorearg ra = { 0 };
1347 dmu_replay_record_t *drr;
1348 objset_t *os;
1349 zio_cksum_t pcksum;
1350 int featureflags;
1351
1352 if (drc->drc_drrb->drr_magic == BSWAP_64(DMU_BACKUP_MAGIC))
1353 ra.byteswap = TRUE;
1354
1355 {
1356 /* compute checksum of drr_begin record */
1357 dmu_replay_record_t *drr;
1358 drr = kmem_zalloc(sizeof (dmu_replay_record_t), KM_SLEEP);
1359
1360 drr->drr_type = DRR_BEGIN;
1361 drr->drr_u.drr_begin = *drc->drc_drrb;
1362 if (ra.byteswap) {
1363 fletcher_4_incremental_byteswap(drr,
1364 sizeof (dmu_replay_record_t), &ra.cksum);
1365 } else {
1366 fletcher_4_incremental_native(drr,
1367 sizeof (dmu_replay_record_t), &ra.cksum);
1368 }
1369 kmem_free(drr, sizeof (dmu_replay_record_t));
1370 }
1371
1372 if (ra.byteswap) {
1373 struct drr_begin *drrb = drc->drc_drrb;
1374 drrb->drr_magic = BSWAP_64(drrb->drr_magic);
1375 drrb->drr_versioninfo = BSWAP_64(drrb->drr_versioninfo);
1376 drrb->drr_creation_time = BSWAP_64(drrb->drr_creation_time);
1377 drrb->drr_type = BSWAP_32(drrb->drr_type);
1378 drrb->drr_toguid = BSWAP_64(drrb->drr_toguid);
1379 drrb->drr_fromguid = BSWAP_64(drrb->drr_fromguid);
1380 }
1381
1382 ra.vp = vp;
1383 ra.voff = *voffp;
1384 ra.bufsize = 1<<20;
1385 ra.buf = vmem_alloc(ra.bufsize, KM_SLEEP);
1386
1387 /* these were verified in dmu_recv_begin */
1388 ASSERT(DMU_GET_STREAM_HDRTYPE(drc->drc_drrb->drr_versioninfo) ==
1389 DMU_SUBSTREAM);
1390 ASSERT(drc->drc_drrb->drr_type < DMU_OST_NUMTYPES);
1391
1392 /*
1393 * Open the objset we are modifying.
1394 */
1395 VERIFY(dmu_objset_from_ds(drc->drc_real_ds, &os) == 0);
1396
1397 ASSERT(drc->drc_real_ds->ds_phys->ds_flags & DS_FLAG_INCONSISTENT);
1398
1399 featureflags = DMU_GET_FEATUREFLAGS(drc->drc_drrb->drr_versioninfo);
1400
1401 /* if this stream is dedup'ed, set up the avl tree for guid mapping */
1402 if (featureflags & DMU_BACKUP_FEATURE_DEDUP) {
1403 minor_t minor;
1404
1405 if (cleanup_fd == -1) {
1406 ra.err = EBADF;
1407 goto out;
1408 }
1409 ra.err = zfs_onexit_fd_hold(cleanup_fd, &minor);
1410 if (ra.err) {
1411 cleanup_fd = -1;
1412 goto out;
1413 }
1414
1415 if (*action_handlep == 0) {
1416 ra.guid_to_ds_map =
1417 kmem_alloc(sizeof (avl_tree_t), KM_SLEEP);
1418 avl_create(ra.guid_to_ds_map, guid_compare,
1419 sizeof (guid_map_entry_t),
1420 offsetof(guid_map_entry_t, avlnode));
1421 ra.err = zfs_onexit_add_cb(minor,
1422 free_guid_map_onexit, ra.guid_to_ds_map,
1423 action_handlep);
1424 if (ra.err)
1425 goto out;
1426 } else {
1427 ra.err = zfs_onexit_cb_data(minor, *action_handlep,
1428 (void **)&ra.guid_to_ds_map);
1429 if (ra.err)
1430 goto out;
1431 }
1432
1433 drc->drc_guid_to_ds_map = ra.guid_to_ds_map;
1434 }
1435
1436 /*
1437 * Read records and process them.
1438 */
1439 pcksum = ra.cksum;
1440 while (ra.err == 0 &&
1441 NULL != (drr = restore_read(&ra, sizeof (*drr)))) {
1442 if (issig(JUSTLOOKING) && issig(FORREAL)) {
1443 ra.err = EINTR;
1444 goto out;
1445 }
1446
1447 if (ra.byteswap)
1448 backup_byteswap(drr);
1449
1450 switch (drr->drr_type) {
1451 case DRR_OBJECT:
1452 {
1453 /*
1454 * We need to make a copy of the record header,
1455 * because restore_{object,write} may need to
1456 * restore_read(), which will invalidate drr.
1457 */
1458 struct drr_object drro = drr->drr_u.drr_object;
1459 ra.err = restore_object(&ra, os, &drro);
1460 break;
1461 }
1462 case DRR_FREEOBJECTS:
1463 {
1464 struct drr_freeobjects drrfo =
1465 drr->drr_u.drr_freeobjects;
1466 ra.err = restore_freeobjects(&ra, os, &drrfo);
1467 break;
1468 }
1469 case DRR_WRITE:
1470 {
1471 struct drr_write drrw = drr->drr_u.drr_write;
1472 ra.err = restore_write(&ra, os, &drrw);
1473 break;
1474 }
1475 case DRR_WRITE_BYREF:
1476 {
1477 struct drr_write_byref drrwbr =
1478 drr->drr_u.drr_write_byref;
1479 ra.err = restore_write_byref(&ra, os, &drrwbr);
1480 break;
1481 }
1482 case DRR_FREE:
1483 {
1484 struct drr_free drrf = drr->drr_u.drr_free;
1485 ra.err = restore_free(&ra, os, &drrf);
1486 break;
1487 }
1488 case DRR_END:
1489 {
1490 struct drr_end drre = drr->drr_u.drr_end;
1491 /*
1492 * We compare against the *previous* checksum
1493 * value, because the stored checksum is of
1494 * everything before the DRR_END record.
1495 */
1496 if (!ZIO_CHECKSUM_EQUAL(drre.drr_checksum, pcksum))
1497 ra.err = ECKSUM;
1498 goto out;
1499 }
1500 case DRR_SPILL:
1501 {
1502 struct drr_spill drrs = drr->drr_u.drr_spill;
1503 ra.err = restore_spill(&ra, os, &drrs);
1504 break;
1505 }
1506 default:
1507 ra.err = EINVAL;
1508 goto out;
1509 }
1510 pcksum = ra.cksum;
1511 }
1512 ASSERT(ra.err != 0);
1513
1514 out:
1515 if ((featureflags & DMU_BACKUP_FEATURE_DEDUP) && (cleanup_fd != -1))
1516 zfs_onexit_fd_rele(cleanup_fd);
1517
1518 if (ra.err != 0) {
1519 /*
1520 * destroy what we created, so we don't leave it in the
1521 * inconsistent restoring state.
1522 */
1523 txg_wait_synced(drc->drc_real_ds->ds_dir->dd_pool, 0);
1524
1525 (void) dsl_dataset_destroy(drc->drc_real_ds, dmu_recv_tag,
1526 B_FALSE);
1527 if (drc->drc_real_ds != drc->drc_logical_ds) {
1528 mutex_exit(&drc->drc_logical_ds->ds_recvlock);
1529 dsl_dataset_rele(drc->drc_logical_ds, dmu_recv_tag);
1530 }
1531 }
1532
1533 vmem_free(ra.buf, ra.bufsize);
1534 *voffp = ra.voff;
1535 return (ra.err);
1536 }
1537
1538 struct recvendsyncarg {
1539 char *tosnap;
1540 uint64_t creation_time;
1541 uint64_t toguid;
1542 };
1543
1544 static int
1545 recv_end_check(void *arg1, void *arg2, dmu_tx_t *tx)
1546 {
1547 dsl_dataset_t *ds = arg1;
1548 struct recvendsyncarg *resa = arg2;
1549
1550 return (dsl_dataset_snapshot_check(ds, resa->tosnap, tx));
1551 }
1552
1553 static void
1554 recv_end_sync(void *arg1, void *arg2, dmu_tx_t *tx)
1555 {
1556 dsl_dataset_t *ds = arg1;
1557 struct recvendsyncarg *resa = arg2;
1558
1559 dsl_dataset_snapshot_sync(ds, resa->tosnap, tx);
1560
1561 /* set snapshot's creation time and guid */
1562 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx);
1563 ds->ds_prev->ds_phys->ds_creation_time = resa->creation_time;
1564 ds->ds_prev->ds_phys->ds_guid = resa->toguid;
1565 ds->ds_prev->ds_phys->ds_flags &= ~DS_FLAG_INCONSISTENT;
1566
1567 dmu_buf_will_dirty(ds->ds_dbuf, tx);
1568 ds->ds_phys->ds_flags &= ~DS_FLAG_INCONSISTENT;
1569 }
1570
1571 static int
1572 add_ds_to_guidmap(avl_tree_t *guid_map, dsl_dataset_t *ds)
1573 {
1574 dsl_pool_t *dp = ds->ds_dir->dd_pool;
1575 uint64_t snapobj = ds->ds_phys->ds_prev_snap_obj;
1576 dsl_dataset_t *snapds;
1577 guid_map_entry_t *gmep;
1578 int err;
1579
1580 ASSERT(guid_map != NULL);
1581
1582 rw_enter(&dp->dp_config_rwlock, RW_READER);
1583 err = dsl_dataset_hold_obj(dp, snapobj, guid_map, &snapds);
1584 if (err == 0) {
1585 gmep = kmem_alloc(sizeof (guid_map_entry_t), KM_SLEEP);
1586 gmep->guid = snapds->ds_phys->ds_guid;
1587 gmep->gme_ds = snapds;
1588 avl_add(guid_map, gmep);
1589 }
1590
1591 rw_exit(&dp->dp_config_rwlock);
1592 return (err);
1593 }
1594
1595 static int
1596 dmu_recv_existing_end(dmu_recv_cookie_t *drc)
1597 {
1598 struct recvendsyncarg resa;
1599 dsl_dataset_t *ds = drc->drc_logical_ds;
1600 int err, myerr;
1601
1602 /*
1603 * XXX hack; seems the ds is still dirty and dsl_pool_zil_clean()
1604 * expects it to have a ds_user_ptr (and zil), but clone_swap()
1605 * can close it.
1606 */
1607 txg_wait_synced(ds->ds_dir->dd_pool, 0);
1608
1609 if (dsl_dataset_tryown(ds, FALSE, dmu_recv_tag)) {
1610 err = dsl_dataset_clone_swap(drc->drc_real_ds, ds,
1611 drc->drc_force);
1612 if (err)
1613 goto out;
1614 } else {
1615 mutex_exit(&ds->ds_recvlock);
1616 dsl_dataset_rele(ds, dmu_recv_tag);
1617 (void) dsl_dataset_destroy(drc->drc_real_ds, dmu_recv_tag,
1618 B_FALSE);
1619 return (EBUSY);
1620 }
1621
1622 resa.creation_time = drc->drc_drrb->drr_creation_time;
1623 resa.toguid = drc->drc_drrb->drr_toguid;
1624 resa.tosnap = drc->drc_tosnap;
1625
1626 err = dsl_sync_task_do(ds->ds_dir->dd_pool,
1627 recv_end_check, recv_end_sync, ds, &resa, 3);
1628 if (err) {
1629 /* swap back */
1630 (void) dsl_dataset_clone_swap(drc->drc_real_ds, ds, B_TRUE);
1631 }
1632
1633 out:
1634 mutex_exit(&ds->ds_recvlock);
1635 if (err == 0 && drc->drc_guid_to_ds_map != NULL)
1636 (void) add_ds_to_guidmap(drc->drc_guid_to_ds_map, ds);
1637 dsl_dataset_disown(ds, dmu_recv_tag);
1638 myerr = dsl_dataset_destroy(drc->drc_real_ds, dmu_recv_tag, B_FALSE);
1639 ASSERT3U(myerr, ==, 0);
1640 return (err);
1641 }
1642
1643 static int
1644 dmu_recv_new_end(dmu_recv_cookie_t *drc)
1645 {
1646 struct recvendsyncarg resa;
1647 dsl_dataset_t *ds = drc->drc_logical_ds;
1648 int err;
1649
1650 /*
1651 * XXX hack; seems the ds is still dirty and dsl_pool_zil_clean()
1652 * expects it to have a ds_user_ptr (and zil), but clone_swap()
1653 * can close it.
1654 */
1655 txg_wait_synced(ds->ds_dir->dd_pool, 0);
1656
1657 resa.creation_time = drc->drc_drrb->drr_creation_time;
1658 resa.toguid = drc->drc_drrb->drr_toguid;
1659 resa.tosnap = drc->drc_tosnap;
1660
1661 err = dsl_sync_task_do(ds->ds_dir->dd_pool,
1662 recv_end_check, recv_end_sync, ds, &resa, 3);
1663 if (err) {
1664 /* clean up the fs we just recv'd into */
1665 (void) dsl_dataset_destroy(ds, dmu_recv_tag, B_FALSE);
1666 } else {
1667 if (drc->drc_guid_to_ds_map != NULL)
1668 (void) add_ds_to_guidmap(drc->drc_guid_to_ds_map, ds);
1669 /* release the hold from dmu_recv_begin */
1670 dsl_dataset_disown(ds, dmu_recv_tag);
1671 }
1672 return (err);
1673 }
1674
1675 int
1676 dmu_recv_end(dmu_recv_cookie_t *drc)
1677 {
1678 if (drc->drc_logical_ds != drc->drc_real_ds)
1679 return (dmu_recv_existing_end(drc));
1680 else
1681 return (dmu_recv_new_end(drc));
1682 }
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