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Illumos #3086: unnecessarily setting DS_FLAG_INCONSISTENT on async
[mirror_zfs-debian.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 * Copyright (c) 2012, Joyent, Inc. 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/zfs_ioctl.h>
43 #include <sys/zap.h>
44 #include <sys/zio_checksum.h>
45 #include <sys/zfs_znode.h>
46 #include <zfs_fletcher.h>
47 #include <sys/avl.h>
48 #include <sys/ddt.h>
49 #include <sys/zfs_onexit.h>
50
51 /* Set this tunable to TRUE to replace corrupt data with 0x2f5baddb10c */
52 int zfs_send_corrupt_data = B_FALSE;
53
54 static char *dmu_recv_tag = "dmu_recv_tag";
55
56 static int
57 dump_bytes(dmu_sendarg_t *dsp, void *buf, int len)
58 {
59 dsl_dataset_t *ds = dsp->dsa_os->os_dsl_dataset;
60 ssize_t resid; /* have to get resid to get detailed errno */
61 ASSERT3U(len % 8, ==, 0);
62
63 fletcher_4_incremental_native(buf, len, &dsp->dsa_zc);
64 dsp->dsa_err = vn_rdwr(UIO_WRITE, dsp->dsa_vp,
65 (caddr_t)buf, len,
66 0, UIO_SYSSPACE, FAPPEND, RLIM64_INFINITY, CRED(), &resid);
67
68 mutex_enter(&ds->ds_sendstream_lock);
69 *dsp->dsa_off += len;
70 mutex_exit(&ds->ds_sendstream_lock);
71
72 return (dsp->dsa_err);
73 }
74
75 static int
76 dump_free(dmu_sendarg_t *dsp, uint64_t object, uint64_t offset,
77 uint64_t length)
78 {
79 struct drr_free *drrf = &(dsp->dsa_drr->drr_u.drr_free);
80
81 if (length != -1ULL && offset + length < offset)
82 length = -1ULL;
83
84 /*
85 * If there is a pending op, but it's not PENDING_FREE, push it out,
86 * since free block aggregation can only be done for blocks of the
87 * same type (i.e., DRR_FREE records can only be aggregated with
88 * other DRR_FREE records. DRR_FREEOBJECTS records can only be
89 * aggregated with other DRR_FREEOBJECTS records.
90 */
91 if (dsp->dsa_pending_op != PENDING_NONE &&
92 dsp->dsa_pending_op != PENDING_FREE) {
93 if (dump_bytes(dsp, dsp->dsa_drr,
94 sizeof (dmu_replay_record_t)) != 0)
95 return (EINTR);
96 dsp->dsa_pending_op = PENDING_NONE;
97 }
98
99 if (dsp->dsa_pending_op == PENDING_FREE) {
100 /*
101 * There should never be a PENDING_FREE if length is -1
102 * (because dump_dnode is the only place where this
103 * function is called with a -1, and only after flushing
104 * any pending record).
105 */
106 ASSERT(length != -1ULL);
107 /*
108 * Check to see whether this free block can be aggregated
109 * with pending one.
110 */
111 if (drrf->drr_object == object && drrf->drr_offset +
112 drrf->drr_length == offset) {
113 drrf->drr_length += length;
114 return (0);
115 } else {
116 /* not a continuation. Push out pending record */
117 if (dump_bytes(dsp, dsp->dsa_drr,
118 sizeof (dmu_replay_record_t)) != 0)
119 return (EINTR);
120 dsp->dsa_pending_op = PENDING_NONE;
121 }
122 }
123 /* create a FREE record and make it pending */
124 bzero(dsp->dsa_drr, sizeof (dmu_replay_record_t));
125 dsp->dsa_drr->drr_type = DRR_FREE;
126 drrf->drr_object = object;
127 drrf->drr_offset = offset;
128 drrf->drr_length = length;
129 drrf->drr_toguid = dsp->dsa_toguid;
130 if (length == -1ULL) {
131 if (dump_bytes(dsp, dsp->dsa_drr,
132 sizeof (dmu_replay_record_t)) != 0)
133 return (EINTR);
134 } else {
135 dsp->dsa_pending_op = PENDING_FREE;
136 }
137
138 return (0);
139 }
140
141 static int
142 dump_data(dmu_sendarg_t *dsp, dmu_object_type_t type,
143 uint64_t object, uint64_t offset, int blksz, const blkptr_t *bp, void *data)
144 {
145 struct drr_write *drrw = &(dsp->dsa_drr->drr_u.drr_write);
146
147
148 /*
149 * If there is any kind of pending aggregation (currently either
150 * a grouping of free objects or free blocks), push it out to
151 * the stream, since aggregation can't be done across operations
152 * of different types.
153 */
154 if (dsp->dsa_pending_op != PENDING_NONE) {
155 if (dump_bytes(dsp, dsp->dsa_drr,
156 sizeof (dmu_replay_record_t)) != 0)
157 return (EINTR);
158 dsp->dsa_pending_op = PENDING_NONE;
159 }
160 /* write a DATA record */
161 bzero(dsp->dsa_drr, sizeof (dmu_replay_record_t));
162 dsp->dsa_drr->drr_type = DRR_WRITE;
163 drrw->drr_object = object;
164 drrw->drr_type = type;
165 drrw->drr_offset = offset;
166 drrw->drr_length = blksz;
167 drrw->drr_toguid = dsp->dsa_toguid;
168 drrw->drr_checksumtype = BP_GET_CHECKSUM(bp);
169 if (zio_checksum_table[drrw->drr_checksumtype].ci_dedup)
170 drrw->drr_checksumflags |= DRR_CHECKSUM_DEDUP;
171 DDK_SET_LSIZE(&drrw->drr_key, BP_GET_LSIZE(bp));
172 DDK_SET_PSIZE(&drrw->drr_key, BP_GET_PSIZE(bp));
173 DDK_SET_COMPRESS(&drrw->drr_key, BP_GET_COMPRESS(bp));
174 drrw->drr_key.ddk_cksum = bp->blk_cksum;
175
176 if (dump_bytes(dsp, dsp->dsa_drr, sizeof (dmu_replay_record_t)) != 0)
177 return (EINTR);
178 if (dump_bytes(dsp, data, blksz) != 0)
179 return (EINTR);
180 return (0);
181 }
182
183 static int
184 dump_spill(dmu_sendarg_t *dsp, uint64_t object, int blksz, void *data)
185 {
186 struct drr_spill *drrs = &(dsp->dsa_drr->drr_u.drr_spill);
187
188 if (dsp->dsa_pending_op != PENDING_NONE) {
189 if (dump_bytes(dsp, dsp->dsa_drr,
190 sizeof (dmu_replay_record_t)) != 0)
191 return (EINTR);
192 dsp->dsa_pending_op = PENDING_NONE;
193 }
194
195 /* write a SPILL record */
196 bzero(dsp->dsa_drr, sizeof (dmu_replay_record_t));
197 dsp->dsa_drr->drr_type = DRR_SPILL;
198 drrs->drr_object = object;
199 drrs->drr_length = blksz;
200 drrs->drr_toguid = dsp->dsa_toguid;
201
202 if (dump_bytes(dsp, dsp->dsa_drr, sizeof (dmu_replay_record_t)))
203 return (EINTR);
204 if (dump_bytes(dsp, data, blksz))
205 return (EINTR);
206 return (0);
207 }
208
209 static int
210 dump_freeobjects(dmu_sendarg_t *dsp, uint64_t firstobj, uint64_t numobjs)
211 {
212 struct drr_freeobjects *drrfo = &(dsp->dsa_drr->drr_u.drr_freeobjects);
213
214 /*
215 * If there is a pending op, but it's not PENDING_FREEOBJECTS,
216 * push it out, since free block aggregation can only be done for
217 * blocks of the same type (i.e., DRR_FREE records can only be
218 * aggregated with other DRR_FREE records. DRR_FREEOBJECTS records
219 * can only be aggregated with other DRR_FREEOBJECTS records.
220 */
221 if (dsp->dsa_pending_op != PENDING_NONE &&
222 dsp->dsa_pending_op != PENDING_FREEOBJECTS) {
223 if (dump_bytes(dsp, dsp->dsa_drr,
224 sizeof (dmu_replay_record_t)) != 0)
225 return (EINTR);
226 dsp->dsa_pending_op = PENDING_NONE;
227 }
228 if (dsp->dsa_pending_op == PENDING_FREEOBJECTS) {
229 /*
230 * See whether this free object array can be aggregated
231 * with pending one
232 */
233 if (drrfo->drr_firstobj + drrfo->drr_numobjs == firstobj) {
234 drrfo->drr_numobjs += numobjs;
235 return (0);
236 } else {
237 /* can't be aggregated. Push out pending record */
238 if (dump_bytes(dsp, dsp->dsa_drr,
239 sizeof (dmu_replay_record_t)) != 0)
240 return (EINTR);
241 dsp->dsa_pending_op = PENDING_NONE;
242 }
243 }
244
245 /* write a FREEOBJECTS record */
246 bzero(dsp->dsa_drr, sizeof (dmu_replay_record_t));
247 dsp->dsa_drr->drr_type = DRR_FREEOBJECTS;
248 drrfo->drr_firstobj = firstobj;
249 drrfo->drr_numobjs = numobjs;
250 drrfo->drr_toguid = dsp->dsa_toguid;
251
252 dsp->dsa_pending_op = PENDING_FREEOBJECTS;
253
254 return (0);
255 }
256
257 static int
258 dump_dnode(dmu_sendarg_t *dsp, uint64_t object, dnode_phys_t *dnp)
259 {
260 struct drr_object *drro = &(dsp->dsa_drr->drr_u.drr_object);
261
262 if (dnp == NULL || dnp->dn_type == DMU_OT_NONE)
263 return (dump_freeobjects(dsp, object, 1));
264
265 if (dsp->dsa_pending_op != PENDING_NONE) {
266 if (dump_bytes(dsp, dsp->dsa_drr,
267 sizeof (dmu_replay_record_t)) != 0)
268 return (EINTR);
269 dsp->dsa_pending_op = PENDING_NONE;
270 }
271
272 /* write an OBJECT record */
273 bzero(dsp->dsa_drr, sizeof (dmu_replay_record_t));
274 dsp->dsa_drr->drr_type = DRR_OBJECT;
275 drro->drr_object = object;
276 drro->drr_type = dnp->dn_type;
277 drro->drr_bonustype = dnp->dn_bonustype;
278 drro->drr_blksz = dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT;
279 drro->drr_bonuslen = dnp->dn_bonuslen;
280 drro->drr_checksumtype = dnp->dn_checksum;
281 drro->drr_compress = dnp->dn_compress;
282 drro->drr_toguid = dsp->dsa_toguid;
283
284 if (dump_bytes(dsp, dsp->dsa_drr, sizeof (dmu_replay_record_t)) != 0)
285 return (EINTR);
286
287 if (dump_bytes(dsp, DN_BONUS(dnp), P2ROUNDUP(dnp->dn_bonuslen, 8)) != 0)
288 return (EINTR);
289
290 /* free anything past the end of the file */
291 if (dump_free(dsp, object, (dnp->dn_maxblkid + 1) *
292 (dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT), -1ULL))
293 return (EINTR);
294 if (dsp->dsa_err)
295 return (EINTR);
296 return (0);
297 }
298
299 #define BP_SPAN(dnp, level) \
300 (((uint64_t)dnp->dn_datablkszsec) << (SPA_MINBLOCKSHIFT + \
301 (level) * (dnp->dn_indblkshift - SPA_BLKPTRSHIFT)))
302
303 /* ARGSUSED */
304 static int
305 backup_cb(spa_t *spa, zilog_t *zilog, const blkptr_t *bp, arc_buf_t *pbuf,
306 const zbookmark_t *zb, const dnode_phys_t *dnp, void *arg)
307 {
308 dmu_sendarg_t *dsp = arg;
309 dmu_object_type_t type = bp ? BP_GET_TYPE(bp) : DMU_OT_NONE;
310 int err = 0;
311
312 if (issig(JUSTLOOKING) && issig(FORREAL))
313 return (EINTR);
314
315 if (zb->zb_object != DMU_META_DNODE_OBJECT &&
316 DMU_OBJECT_IS_SPECIAL(zb->zb_object)) {
317 return (0);
318 } else if (bp == NULL && zb->zb_object == DMU_META_DNODE_OBJECT) {
319 uint64_t span = BP_SPAN(dnp, zb->zb_level);
320 uint64_t dnobj = (zb->zb_blkid * span) >> DNODE_SHIFT;
321 err = dump_freeobjects(dsp, dnobj, span >> DNODE_SHIFT);
322 } else if (bp == NULL) {
323 uint64_t span = BP_SPAN(dnp, zb->zb_level);
324 err = dump_free(dsp, zb->zb_object, zb->zb_blkid * span, span);
325 } else if (zb->zb_level > 0 || type == DMU_OT_OBJSET) {
326 return (0);
327 } else if (type == DMU_OT_DNODE) {
328 dnode_phys_t *blk;
329 int i;
330 int blksz = BP_GET_LSIZE(bp);
331 uint32_t aflags = ARC_WAIT;
332 arc_buf_t *abuf;
333
334 if (dsl_read(NULL, spa, bp, pbuf,
335 arc_getbuf_func, &abuf, ZIO_PRIORITY_ASYNC_READ,
336 ZIO_FLAG_CANFAIL, &aflags, zb) != 0)
337 return (EIO);
338
339 blk = abuf->b_data;
340 for (i = 0; i < blksz >> DNODE_SHIFT; i++) {
341 uint64_t dnobj = (zb->zb_blkid <<
342 (DNODE_BLOCK_SHIFT - DNODE_SHIFT)) + i;
343 err = dump_dnode(dsp, dnobj, blk+i);
344 if (err)
345 break;
346 }
347 (void) arc_buf_remove_ref(abuf, &abuf);
348 } else if (type == DMU_OT_SA) {
349 uint32_t aflags = ARC_WAIT;
350 arc_buf_t *abuf;
351 int blksz = BP_GET_LSIZE(bp);
352
353 if (arc_read_nolock(NULL, spa, bp,
354 arc_getbuf_func, &abuf, ZIO_PRIORITY_ASYNC_READ,
355 ZIO_FLAG_CANFAIL, &aflags, zb) != 0)
356 return (EIO);
357
358 err = dump_spill(dsp, zb->zb_object, blksz, abuf->b_data);
359 (void) arc_buf_remove_ref(abuf, &abuf);
360 } else { /* it's a level-0 block of a regular object */
361 uint32_t aflags = ARC_WAIT;
362 arc_buf_t *abuf;
363 int blksz = BP_GET_LSIZE(bp);
364
365 if (dsl_read(NULL, spa, bp, pbuf,
366 arc_getbuf_func, &abuf, ZIO_PRIORITY_ASYNC_READ,
367 ZIO_FLAG_CANFAIL, &aflags, zb) != 0) {
368 if (zfs_send_corrupt_data) {
369 uint64_t *ptr;
370 /* Send a block filled with 0x"zfs badd bloc" */
371 abuf = arc_buf_alloc(spa, blksz, &abuf,
372 ARC_BUFC_DATA);
373 for (ptr = abuf->b_data;
374 (char *)ptr < (char *)abuf->b_data + blksz;
375 ptr++)
376 *ptr = 0x2f5baddb10c;
377 } else {
378 return (EIO);
379 }
380 }
381
382 err = dump_data(dsp, type, zb->zb_object, zb->zb_blkid * blksz,
383 blksz, bp, abuf->b_data);
384 (void) arc_buf_remove_ref(abuf, &abuf);
385 }
386
387 ASSERT(err == 0 || err == EINTR);
388 return (err);
389 }
390
391 int
392 dmu_send(objset_t *tosnap, objset_t *fromsnap, boolean_t fromorigin,
393 int outfd, vnode_t *vp, offset_t *off)
394 {
395 dsl_dataset_t *ds = tosnap->os_dsl_dataset;
396 dsl_dataset_t *fromds = fromsnap ? fromsnap->os_dsl_dataset : NULL;
397 dmu_replay_record_t *drr;
398 dmu_sendarg_t *dsp;
399 int err;
400 uint64_t fromtxg = 0;
401
402 /* tosnap must be a snapshot */
403 if (ds->ds_phys->ds_next_snap_obj == 0)
404 return (EINVAL);
405
406 /* fromsnap must be an earlier snapshot from the same fs as tosnap */
407 if (fromds && (ds->ds_dir != fromds->ds_dir ||
408 fromds->ds_phys->ds_creation_txg >= ds->ds_phys->ds_creation_txg))
409 return (EXDEV);
410
411 if (fromorigin) {
412 dsl_pool_t *dp = ds->ds_dir->dd_pool;
413
414 if (fromsnap)
415 return (EINVAL);
416
417 if (dsl_dir_is_clone(ds->ds_dir)) {
418 rw_enter(&dp->dp_config_rwlock, RW_READER);
419 err = dsl_dataset_hold_obj(dp,
420 ds->ds_dir->dd_phys->dd_origin_obj, FTAG, &fromds);
421 rw_exit(&dp->dp_config_rwlock);
422 if (err)
423 return (err);
424 } else {
425 fromorigin = B_FALSE;
426 }
427 }
428
429
430 drr = kmem_zalloc(sizeof (dmu_replay_record_t), KM_SLEEP);
431 drr->drr_type = DRR_BEGIN;
432 drr->drr_u.drr_begin.drr_magic = DMU_BACKUP_MAGIC;
433 DMU_SET_STREAM_HDRTYPE(drr->drr_u.drr_begin.drr_versioninfo,
434 DMU_SUBSTREAM);
435
436 #ifdef _KERNEL
437 if (dmu_objset_type(tosnap) == DMU_OST_ZFS) {
438 uint64_t version;
439 if (zfs_get_zplprop(tosnap, ZFS_PROP_VERSION, &version) != 0) {
440 kmem_free(drr, sizeof (dmu_replay_record_t));
441 return (EINVAL);
442 }
443 if (version == ZPL_VERSION_SA) {
444 DMU_SET_FEATUREFLAGS(
445 drr->drr_u.drr_begin.drr_versioninfo,
446 DMU_BACKUP_FEATURE_SA_SPILL);
447 }
448 }
449 #endif
450
451 drr->drr_u.drr_begin.drr_creation_time =
452 ds->ds_phys->ds_creation_time;
453 drr->drr_u.drr_begin.drr_type = tosnap->os_phys->os_type;
454 if (fromorigin)
455 drr->drr_u.drr_begin.drr_flags |= DRR_FLAG_CLONE;
456 drr->drr_u.drr_begin.drr_toguid = ds->ds_phys->ds_guid;
457 if (ds->ds_phys->ds_flags & DS_FLAG_CI_DATASET)
458 drr->drr_u.drr_begin.drr_flags |= DRR_FLAG_CI_DATA;
459
460 if (fromds)
461 drr->drr_u.drr_begin.drr_fromguid = fromds->ds_phys->ds_guid;
462 dsl_dataset_name(ds, drr->drr_u.drr_begin.drr_toname);
463
464 if (fromds)
465 fromtxg = fromds->ds_phys->ds_creation_txg;
466 if (fromorigin)
467 dsl_dataset_rele(fromds, FTAG);
468
469 dsp = kmem_zalloc(sizeof (dmu_sendarg_t), KM_SLEEP);
470
471 dsp->dsa_drr = drr;
472 dsp->dsa_vp = vp;
473 dsp->dsa_outfd = outfd;
474 dsp->dsa_proc = curproc;
475 dsp->dsa_os = tosnap;
476 dsp->dsa_off = off;
477 dsp->dsa_toguid = ds->ds_phys->ds_guid;
478 ZIO_SET_CHECKSUM(&dsp->dsa_zc, 0, 0, 0, 0);
479 dsp->dsa_pending_op = PENDING_NONE;
480
481 mutex_enter(&ds->ds_sendstream_lock);
482 list_insert_head(&ds->ds_sendstreams, dsp);
483 mutex_exit(&ds->ds_sendstream_lock);
484
485 if (dump_bytes(dsp, drr, sizeof (dmu_replay_record_t)) != 0) {
486 err = dsp->dsa_err;
487 goto out;
488 }
489
490 err = traverse_dataset(ds, fromtxg, TRAVERSE_PRE | TRAVERSE_PREFETCH,
491 backup_cb, dsp);
492
493 if (dsp->dsa_pending_op != PENDING_NONE)
494 if (dump_bytes(dsp, drr, sizeof (dmu_replay_record_t)) != 0)
495 err = EINTR;
496
497 if (err) {
498 if (err == EINTR && dsp->dsa_err)
499 err = dsp->dsa_err;
500 goto out;
501 }
502
503 bzero(drr, sizeof (dmu_replay_record_t));
504 drr->drr_type = DRR_END;
505 drr->drr_u.drr_end.drr_checksum = dsp->dsa_zc;
506 drr->drr_u.drr_end.drr_toguid = dsp->dsa_toguid;
507
508 if (dump_bytes(dsp, drr, sizeof (dmu_replay_record_t)) != 0) {
509 err = dsp->dsa_err;
510 goto out;
511 }
512
513 out:
514 mutex_enter(&ds->ds_sendstream_lock);
515 list_remove(&ds->ds_sendstreams, dsp);
516 mutex_exit(&ds->ds_sendstream_lock);
517
518 kmem_free(drr, sizeof (dmu_replay_record_t));
519 kmem_free(dsp, sizeof (dmu_sendarg_t));
520
521 return (err);
522 }
523
524 int
525 dmu_send_estimate(objset_t *tosnap, objset_t *fromsnap, boolean_t fromorigin,
526 uint64_t *sizep)
527 {
528 dsl_dataset_t *ds = tosnap->os_dsl_dataset;
529 dsl_dataset_t *fromds = fromsnap ? fromsnap->os_dsl_dataset : NULL;
530 dsl_pool_t *dp = ds->ds_dir->dd_pool;
531 int err;
532 uint64_t size, recordsize;
533
534 /* tosnap must be a snapshot */
535 if (ds->ds_phys->ds_next_snap_obj == 0)
536 return (EINVAL);
537
538 /* fromsnap must be an earlier snapshot from the same fs as tosnap */
539 if (fromds && (ds->ds_dir != fromds->ds_dir ||
540 fromds->ds_phys->ds_creation_txg >= ds->ds_phys->ds_creation_txg))
541 return (EXDEV);
542
543 if (fromorigin) {
544 if (fromsnap)
545 return (EINVAL);
546
547 if (dsl_dir_is_clone(ds->ds_dir)) {
548 rw_enter(&dp->dp_config_rwlock, RW_READER);
549 err = dsl_dataset_hold_obj(dp,
550 ds->ds_dir->dd_phys->dd_origin_obj, FTAG, &fromds);
551 rw_exit(&dp->dp_config_rwlock);
552 if (err)
553 return (err);
554 } else {
555 fromorigin = B_FALSE;
556 }
557 }
558
559 /* Get uncompressed size estimate of changed data. */
560 if (fromds == NULL) {
561 size = ds->ds_phys->ds_uncompressed_bytes;
562 } else {
563 uint64_t used, comp;
564 err = dsl_dataset_space_written(fromds, ds,
565 &used, &comp, &size);
566 if (fromorigin)
567 dsl_dataset_rele(fromds, FTAG);
568 if (err)
569 return (err);
570 }
571
572 /*
573 * Assume that space (both on-disk and in-stream) is dominated by
574 * data. We will adjust for indirect blocks and the copies property,
575 * but ignore per-object space used (eg, dnodes and DRR_OBJECT records).
576 */
577
578 /*
579 * Subtract out approximate space used by indirect blocks.
580 * Assume most space is used by data blocks (non-indirect, non-dnode).
581 * Assume all blocks are recordsize. Assume ditto blocks and
582 * internal fragmentation counter out compression.
583 *
584 * Therefore, space used by indirect blocks is sizeof(blkptr_t) per
585 * block, which we observe in practice.
586 */
587 rw_enter(&dp->dp_config_rwlock, RW_READER);
588 err = dsl_prop_get_ds(ds, "recordsize",
589 sizeof (recordsize), 1, &recordsize, NULL);
590 rw_exit(&dp->dp_config_rwlock);
591 if (err)
592 return (err);
593 size -= size / recordsize * sizeof (blkptr_t);
594
595 /* Add in the space for the record associated with each block. */
596 size += size / recordsize * sizeof (dmu_replay_record_t);
597
598 *sizep = size;
599
600 return (0);
601 }
602
603 struct recvbeginsyncarg {
604 const char *tofs;
605 const char *tosnap;
606 dsl_dataset_t *origin;
607 uint64_t fromguid;
608 dmu_objset_type_t type;
609 void *tag;
610 boolean_t force;
611 uint64_t dsflags;
612 char clonelastname[MAXNAMELEN];
613 dsl_dataset_t *ds; /* the ds to recv into; returned from the syncfunc */
614 cred_t *cr;
615 };
616
617 /* ARGSUSED */
618 static int
619 recv_new_check(void *arg1, void *arg2, dmu_tx_t *tx)
620 {
621 dsl_dir_t *dd = arg1;
622 struct recvbeginsyncarg *rbsa = arg2;
623 objset_t *mos = dd->dd_pool->dp_meta_objset;
624 uint64_t val;
625 int err;
626
627 err = zap_lookup(mos, dd->dd_phys->dd_child_dir_zapobj,
628 strrchr(rbsa->tofs, '/') + 1, sizeof (uint64_t), 1, &val);
629
630 if (err != ENOENT)
631 return (err ? err : EEXIST);
632
633 if (rbsa->origin) {
634 /* make sure it's a snap in the same pool */
635 if (rbsa->origin->ds_dir->dd_pool != dd->dd_pool)
636 return (EXDEV);
637 if (!dsl_dataset_is_snapshot(rbsa->origin))
638 return (EINVAL);
639 if (rbsa->origin->ds_phys->ds_guid != rbsa->fromguid)
640 return (ENODEV);
641 }
642
643 return (0);
644 }
645
646 static void
647 recv_new_sync(void *arg1, void *arg2, dmu_tx_t *tx)
648 {
649 dsl_dir_t *dd = arg1;
650 struct recvbeginsyncarg *rbsa = arg2;
651 uint64_t flags = DS_FLAG_INCONSISTENT | rbsa->dsflags;
652 uint64_t dsobj;
653
654 /* Create and open new dataset. */
655 dsobj = dsl_dataset_create_sync(dd, strrchr(rbsa->tofs, '/') + 1,
656 rbsa->origin, flags, rbsa->cr, tx);
657 VERIFY(0 == dsl_dataset_own_obj(dd->dd_pool, dsobj,
658 B_TRUE, dmu_recv_tag, &rbsa->ds));
659
660 if (rbsa->origin == NULL) {
661 (void) dmu_objset_create_impl(dd->dd_pool->dp_spa,
662 rbsa->ds, &rbsa->ds->ds_phys->ds_bp, rbsa->type, tx);
663 }
664
665 spa_history_log_internal(LOG_DS_REPLAY_FULL_SYNC,
666 dd->dd_pool->dp_spa, tx, "dataset = %lld", dsobj);
667 }
668
669 /* ARGSUSED */
670 static int
671 recv_existing_check(void *arg1, void *arg2, dmu_tx_t *tx)
672 {
673 dsl_dataset_t *ds = arg1;
674 struct recvbeginsyncarg *rbsa = arg2;
675 int err;
676 uint64_t val;
677
678 /* must not have any changes since most recent snapshot */
679 if (!rbsa->force && dsl_dataset_modified_since_lastsnap(ds))
680 return (ETXTBSY);
681
682 /* new snapshot name must not exist */
683 err = zap_lookup(ds->ds_dir->dd_pool->dp_meta_objset,
684 ds->ds_phys->ds_snapnames_zapobj, rbsa->tosnap, 8, 1, &val);
685 if (err == 0)
686 return (EEXIST);
687 if (err != ENOENT)
688 return (err);
689
690 if (rbsa->fromguid) {
691 /* if incremental, most recent snapshot must match fromguid */
692 if (ds->ds_prev == NULL)
693 return (ENODEV);
694
695 /*
696 * most recent snapshot must match fromguid, or there are no
697 * changes since the fromguid one
698 */
699 if (ds->ds_prev->ds_phys->ds_guid != rbsa->fromguid) {
700 uint64_t birth = ds->ds_prev->ds_phys->ds_bp.blk_birth;
701 uint64_t obj = ds->ds_prev->ds_phys->ds_prev_snap_obj;
702 while (obj != 0) {
703 dsl_dataset_t *snap;
704 err = dsl_dataset_hold_obj(ds->ds_dir->dd_pool,
705 obj, FTAG, &snap);
706 if (err)
707 return (ENODEV);
708 if (snap->ds_phys->ds_creation_txg < birth) {
709 dsl_dataset_rele(snap, FTAG);
710 return (ENODEV);
711 }
712 if (snap->ds_phys->ds_guid == rbsa->fromguid) {
713 dsl_dataset_rele(snap, FTAG);
714 break; /* it's ok */
715 }
716 obj = snap->ds_phys->ds_prev_snap_obj;
717 dsl_dataset_rele(snap, FTAG);
718 }
719 if (obj == 0)
720 return (ENODEV);
721 }
722 } else {
723 /* if full, most recent snapshot must be $ORIGIN */
724 if (ds->ds_phys->ds_prev_snap_txg >= TXG_INITIAL)
725 return (ENODEV);
726 }
727
728 /* temporary clone name must not exist */
729 err = zap_lookup(ds->ds_dir->dd_pool->dp_meta_objset,
730 ds->ds_dir->dd_phys->dd_child_dir_zapobj,
731 rbsa->clonelastname, 8, 1, &val);
732 if (err == 0)
733 return (EEXIST);
734 if (err != ENOENT)
735 return (err);
736
737 return (0);
738 }
739
740 /* ARGSUSED */
741 static void
742 recv_existing_sync(void *arg1, void *arg2, dmu_tx_t *tx)
743 {
744 dsl_dataset_t *ohds = arg1;
745 struct recvbeginsyncarg *rbsa = arg2;
746 dsl_pool_t *dp = ohds->ds_dir->dd_pool;
747 dsl_dataset_t *cds;
748 uint64_t flags = DS_FLAG_INCONSISTENT | rbsa->dsflags;
749 uint64_t dsobj;
750
751 /* create and open the temporary clone */
752 dsobj = dsl_dataset_create_sync(ohds->ds_dir, rbsa->clonelastname,
753 ohds->ds_prev, flags, rbsa->cr, tx);
754 VERIFY(0 == dsl_dataset_own_obj(dp, dsobj, B_TRUE, dmu_recv_tag, &cds));
755
756 /*
757 * If we actually created a non-clone, we need to create the
758 * objset in our new dataset.
759 */
760 if (BP_IS_HOLE(dsl_dataset_get_blkptr(cds))) {
761 (void) dmu_objset_create_impl(dp->dp_spa,
762 cds, dsl_dataset_get_blkptr(cds), rbsa->type, tx);
763 }
764
765 rbsa->ds = cds;
766
767 spa_history_log_internal(LOG_DS_REPLAY_INC_SYNC,
768 dp->dp_spa, tx, "dataset = %lld", dsobj);
769 }
770
771 static boolean_t
772 dmu_recv_verify_features(dsl_dataset_t *ds, struct drr_begin *drrb)
773 {
774 int featureflags;
775
776 featureflags = DMU_GET_FEATUREFLAGS(drrb->drr_versioninfo);
777
778 /* Verify pool version supports SA if SA_SPILL feature set */
779 return ((featureflags & DMU_BACKUP_FEATURE_SA_SPILL) &&
780 (spa_version(dsl_dataset_get_spa(ds)) < SPA_VERSION_SA));
781 }
782
783 /*
784 * NB: callers *MUST* call dmu_recv_stream() if dmu_recv_begin()
785 * succeeds; otherwise we will leak the holds on the datasets.
786 */
787 int
788 dmu_recv_begin(char *tofs, char *tosnap, char *top_ds, struct drr_begin *drrb,
789 boolean_t force, objset_t *origin, dmu_recv_cookie_t *drc)
790 {
791 int err = 0;
792 boolean_t byteswap;
793 struct recvbeginsyncarg rbsa = { 0 };
794 uint64_t versioninfo;
795 int flags;
796 dsl_dataset_t *ds;
797
798 if (drrb->drr_magic == DMU_BACKUP_MAGIC)
799 byteswap = FALSE;
800 else if (drrb->drr_magic == BSWAP_64(DMU_BACKUP_MAGIC))
801 byteswap = TRUE;
802 else
803 return (EINVAL);
804
805 rbsa.tofs = tofs;
806 rbsa.tosnap = tosnap;
807 rbsa.origin = origin ? origin->os_dsl_dataset : NULL;
808 rbsa.fromguid = drrb->drr_fromguid;
809 rbsa.type = drrb->drr_type;
810 rbsa.tag = FTAG;
811 rbsa.dsflags = 0;
812 rbsa.cr = CRED();
813 versioninfo = drrb->drr_versioninfo;
814 flags = drrb->drr_flags;
815
816 if (byteswap) {
817 rbsa.type = BSWAP_32(rbsa.type);
818 rbsa.fromguid = BSWAP_64(rbsa.fromguid);
819 versioninfo = BSWAP_64(versioninfo);
820 flags = BSWAP_32(flags);
821 }
822
823 if (DMU_GET_STREAM_HDRTYPE(versioninfo) == DMU_COMPOUNDSTREAM ||
824 rbsa.type >= DMU_OST_NUMTYPES ||
825 ((flags & DRR_FLAG_CLONE) && origin == NULL))
826 return (EINVAL);
827
828 if (flags & DRR_FLAG_CI_DATA)
829 rbsa.dsflags = DS_FLAG_CI_DATASET;
830
831 bzero(drc, sizeof (dmu_recv_cookie_t));
832 drc->drc_drrb = drrb;
833 drc->drc_tosnap = tosnap;
834 drc->drc_top_ds = top_ds;
835 drc->drc_force = force;
836
837 /*
838 * Process the begin in syncing context.
839 */
840
841 /* open the dataset we are logically receiving into */
842 err = dsl_dataset_hold(tofs, dmu_recv_tag, &ds);
843 if (err == 0) {
844 if (dmu_recv_verify_features(ds, drrb)) {
845 dsl_dataset_rele(ds, dmu_recv_tag);
846 return (ENOTSUP);
847 }
848 /* target fs already exists; recv into temp clone */
849
850 /* Can't recv a clone into an existing fs */
851 if (flags & DRR_FLAG_CLONE) {
852 dsl_dataset_rele(ds, dmu_recv_tag);
853 return (EINVAL);
854 }
855
856 /* must not have an incremental recv already in progress */
857 if (!mutex_tryenter(&ds->ds_recvlock)) {
858 dsl_dataset_rele(ds, dmu_recv_tag);
859 return (EBUSY);
860 }
861
862 /* tmp clone name is: tofs/%tosnap" */
863 (void) snprintf(rbsa.clonelastname, sizeof (rbsa.clonelastname),
864 "%%%s", tosnap);
865 rbsa.force = force;
866 err = dsl_sync_task_do(ds->ds_dir->dd_pool,
867 recv_existing_check, recv_existing_sync, ds, &rbsa, 5);
868 if (err) {
869 mutex_exit(&ds->ds_recvlock);
870 dsl_dataset_rele(ds, dmu_recv_tag);
871 return (err);
872 }
873 drc->drc_logical_ds = ds;
874 drc->drc_real_ds = rbsa.ds;
875 } else if (err == ENOENT) {
876 /* target fs does not exist; must be a full backup or clone */
877 char *cp;
878
879 /*
880 * If it's a non-clone incremental, we are missing the
881 * target fs, so fail the recv.
882 */
883 if (rbsa.fromguid && !(flags & DRR_FLAG_CLONE))
884 return (ENOENT);
885
886 /* Open the parent of tofs */
887 cp = strrchr(tofs, '/');
888 *cp = '\0';
889 err = dsl_dataset_hold(tofs, FTAG, &ds);
890 *cp = '/';
891 if (err)
892 return (err);
893
894 if (dmu_recv_verify_features(ds, drrb)) {
895 dsl_dataset_rele(ds, FTAG);
896 return (ENOTSUP);
897 }
898
899 err = dsl_sync_task_do(ds->ds_dir->dd_pool,
900 recv_new_check, recv_new_sync, ds->ds_dir, &rbsa, 5);
901 dsl_dataset_rele(ds, FTAG);
902 if (err)
903 return (err);
904 drc->drc_logical_ds = drc->drc_real_ds = rbsa.ds;
905 drc->drc_newfs = B_TRUE;
906 }
907
908 return (err);
909 }
910
911 struct restorearg {
912 int err;
913 int byteswap;
914 vnode_t *vp;
915 char *buf;
916 uint64_t voff;
917 int bufsize; /* amount of memory allocated for buf */
918 zio_cksum_t cksum;
919 avl_tree_t *guid_to_ds_map;
920 };
921
922 typedef struct guid_map_entry {
923 uint64_t guid;
924 dsl_dataset_t *gme_ds;
925 avl_node_t avlnode;
926 } guid_map_entry_t;
927
928 static int
929 guid_compare(const void *arg1, const void *arg2)
930 {
931 const guid_map_entry_t *gmep1 = arg1;
932 const guid_map_entry_t *gmep2 = arg2;
933
934 if (gmep1->guid < gmep2->guid)
935 return (-1);
936 else if (gmep1->guid > gmep2->guid)
937 return (1);
938 return (0);
939 }
940
941 static void
942 free_guid_map_onexit(void *arg)
943 {
944 avl_tree_t *ca = arg;
945 void *cookie = NULL;
946 guid_map_entry_t *gmep;
947
948 while ((gmep = avl_destroy_nodes(ca, &cookie)) != NULL) {
949 dsl_dataset_rele(gmep->gme_ds, ca);
950 kmem_free(gmep, sizeof (guid_map_entry_t));
951 }
952 avl_destroy(ca);
953 kmem_free(ca, sizeof (avl_tree_t));
954 }
955
956 static void *
957 restore_read(struct restorearg *ra, int len)
958 {
959 void *rv;
960 int done = 0;
961
962 /* some things will require 8-byte alignment, so everything must */
963 ASSERT3U(len % 8, ==, 0);
964
965 while (done < len) {
966 ssize_t resid;
967
968 ra->err = vn_rdwr(UIO_READ, ra->vp,
969 (caddr_t)ra->buf + done, len - done,
970 ra->voff, UIO_SYSSPACE, FAPPEND,
971 RLIM64_INFINITY, CRED(), &resid);
972
973 if (resid == len - done)
974 ra->err = EINVAL;
975 ra->voff += len - done - resid;
976 done = len - resid;
977 if (ra->err)
978 return (NULL);
979 }
980
981 ASSERT3U(done, ==, len);
982 rv = ra->buf;
983 if (ra->byteswap)
984 fletcher_4_incremental_byteswap(rv, len, &ra->cksum);
985 else
986 fletcher_4_incremental_native(rv, len, &ra->cksum);
987 return (rv);
988 }
989
990 noinline static void
991 backup_byteswap(dmu_replay_record_t *drr)
992 {
993 #define DO64(X) (drr->drr_u.X = BSWAP_64(drr->drr_u.X))
994 #define DO32(X) (drr->drr_u.X = BSWAP_32(drr->drr_u.X))
995 drr->drr_type = BSWAP_32(drr->drr_type);
996 drr->drr_payloadlen = BSWAP_32(drr->drr_payloadlen);
997 switch (drr->drr_type) {
998 case DRR_BEGIN:
999 DO64(drr_begin.drr_magic);
1000 DO64(drr_begin.drr_versioninfo);
1001 DO64(drr_begin.drr_creation_time);
1002 DO32(drr_begin.drr_type);
1003 DO32(drr_begin.drr_flags);
1004 DO64(drr_begin.drr_toguid);
1005 DO64(drr_begin.drr_fromguid);
1006 break;
1007 case DRR_OBJECT:
1008 DO64(drr_object.drr_object);
1009 /* DO64(drr_object.drr_allocation_txg); */
1010 DO32(drr_object.drr_type);
1011 DO32(drr_object.drr_bonustype);
1012 DO32(drr_object.drr_blksz);
1013 DO32(drr_object.drr_bonuslen);
1014 DO64(drr_object.drr_toguid);
1015 break;
1016 case DRR_FREEOBJECTS:
1017 DO64(drr_freeobjects.drr_firstobj);
1018 DO64(drr_freeobjects.drr_numobjs);
1019 DO64(drr_freeobjects.drr_toguid);
1020 break;
1021 case DRR_WRITE:
1022 DO64(drr_write.drr_object);
1023 DO32(drr_write.drr_type);
1024 DO64(drr_write.drr_offset);
1025 DO64(drr_write.drr_length);
1026 DO64(drr_write.drr_toguid);
1027 DO64(drr_write.drr_key.ddk_cksum.zc_word[0]);
1028 DO64(drr_write.drr_key.ddk_cksum.zc_word[1]);
1029 DO64(drr_write.drr_key.ddk_cksum.zc_word[2]);
1030 DO64(drr_write.drr_key.ddk_cksum.zc_word[3]);
1031 DO64(drr_write.drr_key.ddk_prop);
1032 break;
1033 case DRR_WRITE_BYREF:
1034 DO64(drr_write_byref.drr_object);
1035 DO64(drr_write_byref.drr_offset);
1036 DO64(drr_write_byref.drr_length);
1037 DO64(drr_write_byref.drr_toguid);
1038 DO64(drr_write_byref.drr_refguid);
1039 DO64(drr_write_byref.drr_refobject);
1040 DO64(drr_write_byref.drr_refoffset);
1041 DO64(drr_write_byref.drr_key.ddk_cksum.zc_word[0]);
1042 DO64(drr_write_byref.drr_key.ddk_cksum.zc_word[1]);
1043 DO64(drr_write_byref.drr_key.ddk_cksum.zc_word[2]);
1044 DO64(drr_write_byref.drr_key.ddk_cksum.zc_word[3]);
1045 DO64(drr_write_byref.drr_key.ddk_prop);
1046 break;
1047 case DRR_FREE:
1048 DO64(drr_free.drr_object);
1049 DO64(drr_free.drr_offset);
1050 DO64(drr_free.drr_length);
1051 DO64(drr_free.drr_toguid);
1052 break;
1053 case DRR_SPILL:
1054 DO64(drr_spill.drr_object);
1055 DO64(drr_spill.drr_length);
1056 DO64(drr_spill.drr_toguid);
1057 break;
1058 case DRR_END:
1059 DO64(drr_end.drr_checksum.zc_word[0]);
1060 DO64(drr_end.drr_checksum.zc_word[1]);
1061 DO64(drr_end.drr_checksum.zc_word[2]);
1062 DO64(drr_end.drr_checksum.zc_word[3]);
1063 DO64(drr_end.drr_toguid);
1064 break;
1065 default:
1066 break;
1067 }
1068 #undef DO64
1069 #undef DO32
1070 }
1071
1072 noinline static int
1073 restore_object(struct restorearg *ra, objset_t *os, struct drr_object *drro)
1074 {
1075 int err;
1076 dmu_tx_t *tx;
1077 void *data = NULL;
1078
1079 if (drro->drr_type == DMU_OT_NONE ||
1080 !DMU_OT_IS_VALID(drro->drr_type) ||
1081 !DMU_OT_IS_VALID(drro->drr_bonustype) ||
1082 drro->drr_checksumtype >= ZIO_CHECKSUM_FUNCTIONS ||
1083 drro->drr_compress >= ZIO_COMPRESS_FUNCTIONS ||
1084 P2PHASE(drro->drr_blksz, SPA_MINBLOCKSIZE) ||
1085 drro->drr_blksz < SPA_MINBLOCKSIZE ||
1086 drro->drr_blksz > SPA_MAXBLOCKSIZE ||
1087 drro->drr_bonuslen > DN_MAX_BONUSLEN) {
1088 return (EINVAL);
1089 }
1090
1091 err = dmu_object_info(os, drro->drr_object, NULL);
1092
1093 if (err != 0 && err != ENOENT)
1094 return (EINVAL);
1095
1096 if (drro->drr_bonuslen) {
1097 data = restore_read(ra, P2ROUNDUP(drro->drr_bonuslen, 8));
1098 if (ra->err)
1099 return (ra->err);
1100 }
1101
1102 if (err == ENOENT) {
1103 /* currently free, want to be allocated */
1104 tx = dmu_tx_create(os);
1105 dmu_tx_hold_bonus(tx, DMU_NEW_OBJECT);
1106 err = dmu_tx_assign(tx, TXG_WAIT);
1107 if (err) {
1108 dmu_tx_abort(tx);
1109 return (err);
1110 }
1111 err = dmu_object_claim(os, drro->drr_object,
1112 drro->drr_type, drro->drr_blksz,
1113 drro->drr_bonustype, drro->drr_bonuslen, tx);
1114 dmu_tx_commit(tx);
1115 } else {
1116 /* currently allocated, want to be allocated */
1117 err = dmu_object_reclaim(os, drro->drr_object,
1118 drro->drr_type, drro->drr_blksz,
1119 drro->drr_bonustype, drro->drr_bonuslen);
1120 }
1121 if (err) {
1122 return (EINVAL);
1123 }
1124
1125 tx = dmu_tx_create(os);
1126 dmu_tx_hold_bonus(tx, drro->drr_object);
1127 err = dmu_tx_assign(tx, TXG_WAIT);
1128 if (err) {
1129 dmu_tx_abort(tx);
1130 return (err);
1131 }
1132
1133 dmu_object_set_checksum(os, drro->drr_object, drro->drr_checksumtype,
1134 tx);
1135 dmu_object_set_compress(os, drro->drr_object, drro->drr_compress, tx);
1136
1137 if (data != NULL) {
1138 dmu_buf_t *db;
1139
1140 VERIFY(0 == dmu_bonus_hold(os, drro->drr_object, FTAG, &db));
1141 dmu_buf_will_dirty(db, tx);
1142
1143 ASSERT3U(db->db_size, >=, drro->drr_bonuslen);
1144 bcopy(data, db->db_data, drro->drr_bonuslen);
1145 if (ra->byteswap) {
1146 dmu_object_byteswap_t byteswap =
1147 DMU_OT_BYTESWAP(drro->drr_bonustype);
1148 dmu_ot_byteswap[byteswap].ob_func(db->db_data,
1149 drro->drr_bonuslen);
1150 }
1151 dmu_buf_rele(db, FTAG);
1152 }
1153 dmu_tx_commit(tx);
1154 return (0);
1155 }
1156
1157 /* ARGSUSED */
1158 noinline static int
1159 restore_freeobjects(struct restorearg *ra, objset_t *os,
1160 struct drr_freeobjects *drrfo)
1161 {
1162 uint64_t obj;
1163
1164 if (drrfo->drr_firstobj + drrfo->drr_numobjs < drrfo->drr_firstobj)
1165 return (EINVAL);
1166
1167 for (obj = drrfo->drr_firstobj;
1168 obj < drrfo->drr_firstobj + drrfo->drr_numobjs;
1169 (void) dmu_object_next(os, &obj, FALSE, 0)) {
1170 int err;
1171
1172 if (dmu_object_info(os, obj, NULL) != 0)
1173 continue;
1174
1175 err = dmu_free_object(os, obj);
1176 if (err)
1177 return (err);
1178 }
1179 return (0);
1180 }
1181
1182 noinline static int
1183 restore_write(struct restorearg *ra, objset_t *os,
1184 struct drr_write *drrw)
1185 {
1186 dmu_tx_t *tx;
1187 void *data;
1188 int err;
1189
1190 if (drrw->drr_offset + drrw->drr_length < drrw->drr_offset ||
1191 !DMU_OT_IS_VALID(drrw->drr_type))
1192 return (EINVAL);
1193
1194 data = restore_read(ra, drrw->drr_length);
1195 if (data == NULL)
1196 return (ra->err);
1197
1198 if (dmu_object_info(os, drrw->drr_object, NULL) != 0)
1199 return (EINVAL);
1200
1201 tx = dmu_tx_create(os);
1202
1203 dmu_tx_hold_write(tx, drrw->drr_object,
1204 drrw->drr_offset, drrw->drr_length);
1205 err = dmu_tx_assign(tx, TXG_WAIT);
1206 if (err) {
1207 dmu_tx_abort(tx);
1208 return (err);
1209 }
1210 if (ra->byteswap) {
1211 dmu_object_byteswap_t byteswap =
1212 DMU_OT_BYTESWAP(drrw->drr_type);
1213 dmu_ot_byteswap[byteswap].ob_func(data, drrw->drr_length);
1214 }
1215 dmu_write(os, drrw->drr_object,
1216 drrw->drr_offset, drrw->drr_length, data, tx);
1217 dmu_tx_commit(tx);
1218 return (0);
1219 }
1220
1221 /*
1222 * Handle a DRR_WRITE_BYREF record. This record is used in dedup'ed
1223 * streams to refer to a copy of the data that is already on the
1224 * system because it came in earlier in the stream. This function
1225 * finds the earlier copy of the data, and uses that copy instead of
1226 * data from the stream to fulfill this write.
1227 */
1228 static int
1229 restore_write_byref(struct restorearg *ra, objset_t *os,
1230 struct drr_write_byref *drrwbr)
1231 {
1232 dmu_tx_t *tx;
1233 int err;
1234 guid_map_entry_t gmesrch;
1235 guid_map_entry_t *gmep;
1236 avl_index_t where;
1237 objset_t *ref_os = NULL;
1238 dmu_buf_t *dbp;
1239
1240 if (drrwbr->drr_offset + drrwbr->drr_length < drrwbr->drr_offset)
1241 return (EINVAL);
1242
1243 /*
1244 * If the GUID of the referenced dataset is different from the
1245 * GUID of the target dataset, find the referenced dataset.
1246 */
1247 if (drrwbr->drr_toguid != drrwbr->drr_refguid) {
1248 gmesrch.guid = drrwbr->drr_refguid;
1249 if ((gmep = avl_find(ra->guid_to_ds_map, &gmesrch,
1250 &where)) == NULL) {
1251 return (EINVAL);
1252 }
1253 if (dmu_objset_from_ds(gmep->gme_ds, &ref_os))
1254 return (EINVAL);
1255 } else {
1256 ref_os = os;
1257 }
1258
1259 err = dmu_buf_hold(ref_os, drrwbr->drr_refobject,
1260 drrwbr->drr_refoffset, FTAG, &dbp, DMU_READ_PREFETCH);
1261 if (err)
1262 return (err);
1263
1264 tx = dmu_tx_create(os);
1265
1266 dmu_tx_hold_write(tx, drrwbr->drr_object,
1267 drrwbr->drr_offset, drrwbr->drr_length);
1268 err = dmu_tx_assign(tx, TXG_WAIT);
1269 if (err) {
1270 dmu_tx_abort(tx);
1271 return (err);
1272 }
1273 dmu_write(os, drrwbr->drr_object,
1274 drrwbr->drr_offset, drrwbr->drr_length, dbp->db_data, tx);
1275 dmu_buf_rele(dbp, FTAG);
1276 dmu_tx_commit(tx);
1277 return (0);
1278 }
1279
1280 static int
1281 restore_spill(struct restorearg *ra, objset_t *os, struct drr_spill *drrs)
1282 {
1283 dmu_tx_t *tx;
1284 void *data;
1285 dmu_buf_t *db, *db_spill;
1286 int err;
1287
1288 if (drrs->drr_length < SPA_MINBLOCKSIZE ||
1289 drrs->drr_length > SPA_MAXBLOCKSIZE)
1290 return (EINVAL);
1291
1292 data = restore_read(ra, drrs->drr_length);
1293 if (data == NULL)
1294 return (ra->err);
1295
1296 if (dmu_object_info(os, drrs->drr_object, NULL) != 0)
1297 return (EINVAL);
1298
1299 VERIFY(0 == dmu_bonus_hold(os, drrs->drr_object, FTAG, &db));
1300 if ((err = dmu_spill_hold_by_bonus(db, FTAG, &db_spill)) != 0) {
1301 dmu_buf_rele(db, FTAG);
1302 return (err);
1303 }
1304
1305 tx = dmu_tx_create(os);
1306
1307 dmu_tx_hold_spill(tx, db->db_object);
1308
1309 err = dmu_tx_assign(tx, TXG_WAIT);
1310 if (err) {
1311 dmu_buf_rele(db, FTAG);
1312 dmu_buf_rele(db_spill, FTAG);
1313 dmu_tx_abort(tx);
1314 return (err);
1315 }
1316 dmu_buf_will_dirty(db_spill, tx);
1317
1318 if (db_spill->db_size < drrs->drr_length)
1319 VERIFY(0 == dbuf_spill_set_blksz(db_spill,
1320 drrs->drr_length, tx));
1321 bcopy(data, db_spill->db_data, drrs->drr_length);
1322
1323 dmu_buf_rele(db, FTAG);
1324 dmu_buf_rele(db_spill, FTAG);
1325
1326 dmu_tx_commit(tx);
1327 return (0);
1328 }
1329
1330 /* ARGSUSED */
1331 noinline static int
1332 restore_free(struct restorearg *ra, objset_t *os,
1333 struct drr_free *drrf)
1334 {
1335 int err;
1336
1337 if (drrf->drr_length != -1ULL &&
1338 drrf->drr_offset + drrf->drr_length < drrf->drr_offset)
1339 return (EINVAL);
1340
1341 if (dmu_object_info(os, drrf->drr_object, NULL) != 0)
1342 return (EINVAL);
1343
1344 err = dmu_free_long_range(os, drrf->drr_object,
1345 drrf->drr_offset, drrf->drr_length);
1346 return (err);
1347 }
1348
1349 /*
1350 * NB: callers *must* call dmu_recv_end() if this succeeds.
1351 */
1352 int
1353 dmu_recv_stream(dmu_recv_cookie_t *drc, vnode_t *vp, offset_t *voffp,
1354 int cleanup_fd, uint64_t *action_handlep)
1355 {
1356 struct restorearg ra = { 0 };
1357 dmu_replay_record_t *drr;
1358 objset_t *os;
1359 zio_cksum_t pcksum;
1360 int featureflags;
1361
1362 if (drc->drc_drrb->drr_magic == BSWAP_64(DMU_BACKUP_MAGIC))
1363 ra.byteswap = TRUE;
1364
1365 {
1366 /* compute checksum of drr_begin record */
1367 dmu_replay_record_t *drr;
1368 drr = kmem_zalloc(sizeof (dmu_replay_record_t), KM_SLEEP);
1369
1370 drr->drr_type = DRR_BEGIN;
1371 drr->drr_u.drr_begin = *drc->drc_drrb;
1372 if (ra.byteswap) {
1373 fletcher_4_incremental_byteswap(drr,
1374 sizeof (dmu_replay_record_t), &ra.cksum);
1375 } else {
1376 fletcher_4_incremental_native(drr,
1377 sizeof (dmu_replay_record_t), &ra.cksum);
1378 }
1379 kmem_free(drr, sizeof (dmu_replay_record_t));
1380 }
1381
1382 if (ra.byteswap) {
1383 struct drr_begin *drrb = drc->drc_drrb;
1384 drrb->drr_magic = BSWAP_64(drrb->drr_magic);
1385 drrb->drr_versioninfo = BSWAP_64(drrb->drr_versioninfo);
1386 drrb->drr_creation_time = BSWAP_64(drrb->drr_creation_time);
1387 drrb->drr_type = BSWAP_32(drrb->drr_type);
1388 drrb->drr_toguid = BSWAP_64(drrb->drr_toguid);
1389 drrb->drr_fromguid = BSWAP_64(drrb->drr_fromguid);
1390 }
1391
1392 ra.vp = vp;
1393 ra.voff = *voffp;
1394 ra.bufsize = 1<<20;
1395 ra.buf = vmem_alloc(ra.bufsize, KM_SLEEP);
1396
1397 /* these were verified in dmu_recv_begin */
1398 ASSERT(DMU_GET_STREAM_HDRTYPE(drc->drc_drrb->drr_versioninfo) ==
1399 DMU_SUBSTREAM);
1400 ASSERT(drc->drc_drrb->drr_type < DMU_OST_NUMTYPES);
1401
1402 /*
1403 * Open the objset we are modifying.
1404 */
1405 VERIFY(dmu_objset_from_ds(drc->drc_real_ds, &os) == 0);
1406
1407 ASSERT(drc->drc_real_ds->ds_phys->ds_flags & DS_FLAG_INCONSISTENT);
1408
1409 featureflags = DMU_GET_FEATUREFLAGS(drc->drc_drrb->drr_versioninfo);
1410
1411 /* if this stream is dedup'ed, set up the avl tree for guid mapping */
1412 if (featureflags & DMU_BACKUP_FEATURE_DEDUP) {
1413 minor_t minor;
1414
1415 if (cleanup_fd == -1) {
1416 ra.err = EBADF;
1417 goto out;
1418 }
1419 ra.err = zfs_onexit_fd_hold(cleanup_fd, &minor);
1420 if (ra.err) {
1421 cleanup_fd = -1;
1422 goto out;
1423 }
1424
1425 if (*action_handlep == 0) {
1426 ra.guid_to_ds_map =
1427 kmem_alloc(sizeof (avl_tree_t), KM_SLEEP);
1428 avl_create(ra.guid_to_ds_map, guid_compare,
1429 sizeof (guid_map_entry_t),
1430 offsetof(guid_map_entry_t, avlnode));
1431 ra.err = zfs_onexit_add_cb(minor,
1432 free_guid_map_onexit, ra.guid_to_ds_map,
1433 action_handlep);
1434 if (ra.err)
1435 goto out;
1436 } else {
1437 ra.err = zfs_onexit_cb_data(minor, *action_handlep,
1438 (void **)&ra.guid_to_ds_map);
1439 if (ra.err)
1440 goto out;
1441 }
1442
1443 drc->drc_guid_to_ds_map = ra.guid_to_ds_map;
1444 }
1445
1446 /*
1447 * Read records and process them.
1448 */
1449 pcksum = ra.cksum;
1450 while (ra.err == 0 &&
1451 NULL != (drr = restore_read(&ra, sizeof (*drr)))) {
1452 if (issig(JUSTLOOKING) && issig(FORREAL)) {
1453 ra.err = EINTR;
1454 goto out;
1455 }
1456
1457 if (ra.byteswap)
1458 backup_byteswap(drr);
1459
1460 switch (drr->drr_type) {
1461 case DRR_OBJECT:
1462 {
1463 /*
1464 * We need to make a copy of the record header,
1465 * because restore_{object,write} may need to
1466 * restore_read(), which will invalidate drr.
1467 */
1468 struct drr_object drro = drr->drr_u.drr_object;
1469 ra.err = restore_object(&ra, os, &drro);
1470 break;
1471 }
1472 case DRR_FREEOBJECTS:
1473 {
1474 struct drr_freeobjects drrfo =
1475 drr->drr_u.drr_freeobjects;
1476 ra.err = restore_freeobjects(&ra, os, &drrfo);
1477 break;
1478 }
1479 case DRR_WRITE:
1480 {
1481 struct drr_write drrw = drr->drr_u.drr_write;
1482 ra.err = restore_write(&ra, os, &drrw);
1483 break;
1484 }
1485 case DRR_WRITE_BYREF:
1486 {
1487 struct drr_write_byref drrwbr =
1488 drr->drr_u.drr_write_byref;
1489 ra.err = restore_write_byref(&ra, os, &drrwbr);
1490 break;
1491 }
1492 case DRR_FREE:
1493 {
1494 struct drr_free drrf = drr->drr_u.drr_free;
1495 ra.err = restore_free(&ra, os, &drrf);
1496 break;
1497 }
1498 case DRR_END:
1499 {
1500 struct drr_end drre = drr->drr_u.drr_end;
1501 /*
1502 * We compare against the *previous* checksum
1503 * value, because the stored checksum is of
1504 * everything before the DRR_END record.
1505 */
1506 if (!ZIO_CHECKSUM_EQUAL(drre.drr_checksum, pcksum))
1507 ra.err = ECKSUM;
1508 goto out;
1509 }
1510 case DRR_SPILL:
1511 {
1512 struct drr_spill drrs = drr->drr_u.drr_spill;
1513 ra.err = restore_spill(&ra, os, &drrs);
1514 break;
1515 }
1516 default:
1517 ra.err = EINVAL;
1518 goto out;
1519 }
1520 pcksum = ra.cksum;
1521 }
1522 ASSERT(ra.err != 0);
1523
1524 out:
1525 if ((featureflags & DMU_BACKUP_FEATURE_DEDUP) && (cleanup_fd != -1))
1526 zfs_onexit_fd_rele(cleanup_fd);
1527
1528 if (ra.err != 0) {
1529 /*
1530 * destroy what we created, so we don't leave it in the
1531 * inconsistent restoring state.
1532 */
1533 txg_wait_synced(drc->drc_real_ds->ds_dir->dd_pool, 0);
1534
1535 (void) dsl_dataset_destroy(drc->drc_real_ds, dmu_recv_tag,
1536 B_FALSE);
1537 if (drc->drc_real_ds != drc->drc_logical_ds) {
1538 mutex_exit(&drc->drc_logical_ds->ds_recvlock);
1539 dsl_dataset_rele(drc->drc_logical_ds, dmu_recv_tag);
1540 }
1541 }
1542
1543 vmem_free(ra.buf, ra.bufsize);
1544 *voffp = ra.voff;
1545 return (ra.err);
1546 }
1547
1548 struct recvendsyncarg {
1549 char *tosnap;
1550 uint64_t creation_time;
1551 uint64_t toguid;
1552 };
1553
1554 static int
1555 recv_end_check(void *arg1, void *arg2, dmu_tx_t *tx)
1556 {
1557 dsl_dataset_t *ds = arg1;
1558 struct recvendsyncarg *resa = arg2;
1559
1560 return (dsl_dataset_snapshot_check(ds, resa->tosnap, tx));
1561 }
1562
1563 static void
1564 recv_end_sync(void *arg1, void *arg2, dmu_tx_t *tx)
1565 {
1566 dsl_dataset_t *ds = arg1;
1567 struct recvendsyncarg *resa = arg2;
1568
1569 dsl_dataset_snapshot_sync(ds, resa->tosnap, tx);
1570
1571 /* set snapshot's creation time and guid */
1572 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx);
1573 ds->ds_prev->ds_phys->ds_creation_time = resa->creation_time;
1574 ds->ds_prev->ds_phys->ds_guid = resa->toguid;
1575 ds->ds_prev->ds_phys->ds_flags &= ~DS_FLAG_INCONSISTENT;
1576
1577 dmu_buf_will_dirty(ds->ds_dbuf, tx);
1578 ds->ds_phys->ds_flags &= ~DS_FLAG_INCONSISTENT;
1579 }
1580
1581 static int
1582 add_ds_to_guidmap(avl_tree_t *guid_map, dsl_dataset_t *ds)
1583 {
1584 dsl_pool_t *dp = ds->ds_dir->dd_pool;
1585 uint64_t snapobj = ds->ds_phys->ds_prev_snap_obj;
1586 dsl_dataset_t *snapds;
1587 guid_map_entry_t *gmep;
1588 int err;
1589
1590 ASSERT(guid_map != NULL);
1591
1592 rw_enter(&dp->dp_config_rwlock, RW_READER);
1593 err = dsl_dataset_hold_obj(dp, snapobj, guid_map, &snapds);
1594 if (err == 0) {
1595 gmep = kmem_alloc(sizeof (guid_map_entry_t), KM_SLEEP);
1596 gmep->guid = snapds->ds_phys->ds_guid;
1597 gmep->gme_ds = snapds;
1598 avl_add(guid_map, gmep);
1599 }
1600
1601 rw_exit(&dp->dp_config_rwlock);
1602 return (err);
1603 }
1604
1605 static int
1606 dmu_recv_existing_end(dmu_recv_cookie_t *drc)
1607 {
1608 struct recvendsyncarg resa;
1609 dsl_dataset_t *ds = drc->drc_logical_ds;
1610 int err, myerr;
1611
1612 if (dsl_dataset_tryown(ds, FALSE, dmu_recv_tag)) {
1613 err = dsl_dataset_clone_swap(drc->drc_real_ds, ds,
1614 drc->drc_force);
1615 if (err)
1616 goto out;
1617 } else {
1618 mutex_exit(&ds->ds_recvlock);
1619 dsl_dataset_rele(ds, dmu_recv_tag);
1620 (void) dsl_dataset_destroy(drc->drc_real_ds, dmu_recv_tag,
1621 B_FALSE);
1622 return (EBUSY);
1623 }
1624
1625 resa.creation_time = drc->drc_drrb->drr_creation_time;
1626 resa.toguid = drc->drc_drrb->drr_toguid;
1627 resa.tosnap = drc->drc_tosnap;
1628
1629 err = dsl_sync_task_do(ds->ds_dir->dd_pool,
1630 recv_end_check, recv_end_sync, ds, &resa, 3);
1631 if (err) {
1632 /* swap back */
1633 (void) dsl_dataset_clone_swap(drc->drc_real_ds, ds, B_TRUE);
1634 }
1635
1636 out:
1637 mutex_exit(&ds->ds_recvlock);
1638 if (err == 0 && drc->drc_guid_to_ds_map != NULL)
1639 (void) add_ds_to_guidmap(drc->drc_guid_to_ds_map, ds);
1640 dsl_dataset_disown(ds, dmu_recv_tag);
1641 myerr = dsl_dataset_destroy(drc->drc_real_ds, dmu_recv_tag, B_FALSE);
1642 ASSERT3U(myerr, ==, 0);
1643 return (err);
1644 }
1645
1646 static int
1647 dmu_recv_new_end(dmu_recv_cookie_t *drc)
1648 {
1649 struct recvendsyncarg resa;
1650 dsl_dataset_t *ds = drc->drc_logical_ds;
1651 int err;
1652
1653 /*
1654 * XXX hack; seems the ds is still dirty and dsl_pool_zil_clean()
1655 * expects it to have a ds_user_ptr (and zil), but clone_swap()
1656 * can close it.
1657 */
1658 txg_wait_synced(ds->ds_dir->dd_pool, 0);
1659
1660 resa.creation_time = drc->drc_drrb->drr_creation_time;
1661 resa.toguid = drc->drc_drrb->drr_toguid;
1662 resa.tosnap = drc->drc_tosnap;
1663
1664 err = dsl_sync_task_do(ds->ds_dir->dd_pool,
1665 recv_end_check, recv_end_sync, ds, &resa, 3);
1666 if (err) {
1667 /* clean up the fs we just recv'd into */
1668 (void) dsl_dataset_destroy(ds, dmu_recv_tag, B_FALSE);
1669 } else {
1670 if (drc->drc_guid_to_ds_map != NULL)
1671 (void) add_ds_to_guidmap(drc->drc_guid_to_ds_map, ds);
1672 /* release the hold from dmu_recv_begin */
1673 dsl_dataset_disown(ds, dmu_recv_tag);
1674 }
1675 return (err);
1676 }
1677
1678 int
1679 dmu_recv_end(dmu_recv_cookie_t *drc)
1680 {
1681 if (drc->drc_logical_ds != drc->drc_real_ds)
1682 return (dmu_recv_existing_end(drc));
1683 else
1684 return (dmu_recv_new_end(drc));
1685 }
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