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3888 zfs recv -F should destroy any snapshots created since the incremental source
[unleashed.git] / usr / src / uts / common / fs / zfs / dmu_send.c
blobd485d3ba01c7efc392452ed78c0ea3f1ffab5d51
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 2011 Nexenta Systems, Inc. All rights reserved.
24 * Copyright (c) 2013 by Delphix. All rights reserved.
25 * Copyright (c) 2012, Joyent, Inc. 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 #include <sys/dmu_send.h>
50 #include <sys/dsl_destroy.h>
51
52 /* Set this tunable to TRUE to replace corrupt data with 0x2f5baddb10c */
53 int zfs_send_corrupt_data = B_FALSE;
54
55 static char *dmu_recv_tag = "dmu_recv_tag";
56 static const char *recv_clone_name = "%recv";
57
58 static int
59 dump_bytes(dmu_sendarg_t *dsp, void *buf, int len)
60 {
61 dsl_dataset_t *ds = dsp->dsa_os->os_dsl_dataset;
62 ssize_t resid; /* have to get resid to get detailed errno */
63 ASSERT0(len % 8);
64
65 fletcher_4_incremental_native(buf, len, &dsp->dsa_zc);
66 dsp->dsa_err = vn_rdwr(UIO_WRITE, dsp->dsa_vp,
67 (caddr_t)buf, len,
68 0, UIO_SYSSPACE, FAPPEND, RLIM64_INFINITY, CRED(), &resid);
69
70 mutex_enter(&ds->ds_sendstream_lock);
71 *dsp->dsa_off += len;
72 mutex_exit(&ds->ds_sendstream_lock);
73
74 return (dsp->dsa_err);
75 }
76
77 static int
78 dump_free(dmu_sendarg_t *dsp, uint64_t object, uint64_t offset,
79 uint64_t length)
80 {
81 struct drr_free *drrf = &(dsp->dsa_drr->drr_u.drr_free);
82
83 if (length != -1ULL && offset + length < offset)
84 length = -1ULL;
85
86 /*
87 * If there is a pending op, but it's not PENDING_FREE, push it out,
88 * since free block aggregation can only be done for blocks of the
89 * same type (i.e., DRR_FREE records can only be aggregated with
90 * other DRR_FREE records. DRR_FREEOBJECTS records can only be
91 * aggregated with other DRR_FREEOBJECTS records.
92 */
93 if (dsp->dsa_pending_op != PENDING_NONE &&
94 dsp->dsa_pending_op != PENDING_FREE) {
95 if (dump_bytes(dsp, dsp->dsa_drr,
96 sizeof (dmu_replay_record_t)) != 0)
97 return (SET_ERROR(EINTR));
98 dsp->dsa_pending_op = PENDING_NONE;
99 }
100
101 if (dsp->dsa_pending_op == PENDING_FREE) {
102 /*
103 * There should never be a PENDING_FREE if length is -1
104 * (because dump_dnode is the only place where this
105 * function is called with a -1, and only after flushing
106 * any pending record).
107 */
108 ASSERT(length != -1ULL);
109 /*
110 * Check to see whether this free block can be aggregated
111 * with pending one.
112 */
113 if (drrf->drr_object == object && drrf->drr_offset +
114 drrf->drr_length == offset) {
115 drrf->drr_length += length;
116 return (0);
117 } else {
118 /* not a continuation. Push out pending record */
119 if (dump_bytes(dsp, dsp->dsa_drr,
120 sizeof (dmu_replay_record_t)) != 0)
121 return (SET_ERROR(EINTR));
122 dsp->dsa_pending_op = PENDING_NONE;
123 }
124 }
125 /* create a FREE record and make it pending */
126 bzero(dsp->dsa_drr, sizeof (dmu_replay_record_t));
127 dsp->dsa_drr->drr_type = DRR_FREE;
128 drrf->drr_object = object;
129 drrf->drr_offset = offset;
130 drrf->drr_length = length;
131 drrf->drr_toguid = dsp->dsa_toguid;
132 if (length == -1ULL) {
133 if (dump_bytes(dsp, dsp->dsa_drr,
134 sizeof (dmu_replay_record_t)) != 0)
135 return (SET_ERROR(EINTR));
136 } else {
137 dsp->dsa_pending_op = PENDING_FREE;
138 }
139
140 return (0);
141 }
142
143 static int
144 dump_data(dmu_sendarg_t *dsp, dmu_object_type_t type,
145 uint64_t object, uint64_t offset, int blksz, const blkptr_t *bp, void *data)
146 {
147 struct drr_write *drrw = &(dsp->dsa_drr->drr_u.drr_write);
148
149
150 /*
151 * If there is any kind of pending aggregation (currently either
152 * a grouping of free objects or free blocks), push it out to
153 * the stream, since aggregation can't be done across operations
154 * of different types.
155 */
156 if (dsp->dsa_pending_op != PENDING_NONE) {
157 if (dump_bytes(dsp, dsp->dsa_drr,
158 sizeof (dmu_replay_record_t)) != 0)
159 return (SET_ERROR(EINTR));
160 dsp->dsa_pending_op = PENDING_NONE;
161 }
162 /* write a DATA record */
163 bzero(dsp->dsa_drr, sizeof (dmu_replay_record_t));
164 dsp->dsa_drr->drr_type = DRR_WRITE;
165 drrw->drr_object = object;
166 drrw->drr_type = type;
167 drrw->drr_offset = offset;
168 drrw->drr_length = blksz;
169 drrw->drr_toguid = dsp->dsa_toguid;
170 drrw->drr_checksumtype = BP_GET_CHECKSUM(bp);
171 if (zio_checksum_table[drrw->drr_checksumtype].ci_dedup)
172 drrw->drr_checksumflags |= DRR_CHECKSUM_DEDUP;
173 DDK_SET_LSIZE(&drrw->drr_key, BP_GET_LSIZE(bp));
174 DDK_SET_PSIZE(&drrw->drr_key, BP_GET_PSIZE(bp));
175 DDK_SET_COMPRESS(&drrw->drr_key, BP_GET_COMPRESS(bp));
176 drrw->drr_key.ddk_cksum = bp->blk_cksum;
177
178 if (dump_bytes(dsp, dsp->dsa_drr, sizeof (dmu_replay_record_t)) != 0)
179 return (SET_ERROR(EINTR));
180 if (dump_bytes(dsp, data, blksz) != 0)
181 return (SET_ERROR(EINTR));
182 return (0);
183 }
184
185 static int
186 dump_spill(dmu_sendarg_t *dsp, uint64_t object, int blksz, void *data)
187 {
188 struct drr_spill *drrs = &(dsp->dsa_drr->drr_u.drr_spill);
189
190 if (dsp->dsa_pending_op != PENDING_NONE) {
191 if (dump_bytes(dsp, dsp->dsa_drr,
192 sizeof (dmu_replay_record_t)) != 0)
193 return (SET_ERROR(EINTR));
194 dsp->dsa_pending_op = PENDING_NONE;
195 }
196
197 /* write a SPILL record */
198 bzero(dsp->dsa_drr, sizeof (dmu_replay_record_t));
199 dsp->dsa_drr->drr_type = DRR_SPILL;
200 drrs->drr_object = object;
201 drrs->drr_length = blksz;
202 drrs->drr_toguid = dsp->dsa_toguid;
203
204 if (dump_bytes(dsp, dsp->dsa_drr, sizeof (dmu_replay_record_t)))
205 return (SET_ERROR(EINTR));
206 if (dump_bytes(dsp, data, blksz))
207 return (SET_ERROR(EINTR));
208 return (0);
209 }
210
211 static int
212 dump_freeobjects(dmu_sendarg_t *dsp, uint64_t firstobj, uint64_t numobjs)
213 {
214 struct drr_freeobjects *drrfo = &(dsp->dsa_drr->drr_u.drr_freeobjects);
215
216 /*
217 * If there is a pending op, but it's not PENDING_FREEOBJECTS,
218 * push it out, since free block aggregation can only be done for
219 * blocks of the same type (i.e., DRR_FREE records can only be
220 * aggregated with other DRR_FREE records. DRR_FREEOBJECTS records
221 * can only be aggregated with other DRR_FREEOBJECTS records.
222 */
223 if (dsp->dsa_pending_op != PENDING_NONE &&
224 dsp->dsa_pending_op != PENDING_FREEOBJECTS) {
225 if (dump_bytes(dsp, dsp->dsa_drr,
226 sizeof (dmu_replay_record_t)) != 0)
227 return (SET_ERROR(EINTR));
228 dsp->dsa_pending_op = PENDING_NONE;
229 }
230 if (dsp->dsa_pending_op == PENDING_FREEOBJECTS) {
231 /*
232 * See whether this free object array can be aggregated
233 * with pending one
234 */
235 if (drrfo->drr_firstobj + drrfo->drr_numobjs == firstobj) {
236 drrfo->drr_numobjs += numobjs;
237 return (0);
238 } else {
239 /* can't be aggregated. Push out pending record */
240 if (dump_bytes(dsp, dsp->dsa_drr,
241 sizeof (dmu_replay_record_t)) != 0)
242 return (SET_ERROR(EINTR));
243 dsp->dsa_pending_op = PENDING_NONE;
244 }
245 }
246
247 /* write a FREEOBJECTS record */
248 bzero(dsp->dsa_drr, sizeof (dmu_replay_record_t));
249 dsp->dsa_drr->drr_type = DRR_FREEOBJECTS;
250 drrfo->drr_firstobj = firstobj;
251 drrfo->drr_numobjs = numobjs;
252 drrfo->drr_toguid = dsp->dsa_toguid;
253
254 dsp->dsa_pending_op = PENDING_FREEOBJECTS;
255
256 return (0);
257 }
258
259 static int
260 dump_dnode(dmu_sendarg_t *dsp, uint64_t object, dnode_phys_t *dnp)
261 {
262 struct drr_object *drro = &(dsp->dsa_drr->drr_u.drr_object);
263
264 if (dnp == NULL || dnp->dn_type == DMU_OT_NONE)
265 return (dump_freeobjects(dsp, object, 1));
266
267 if (dsp->dsa_pending_op != PENDING_NONE) {
268 if (dump_bytes(dsp, dsp->dsa_drr,
269 sizeof (dmu_replay_record_t)) != 0)
270 return (SET_ERROR(EINTR));
271 dsp->dsa_pending_op = PENDING_NONE;
272 }
273
274 /* write an OBJECT record */
275 bzero(dsp->dsa_drr, sizeof (dmu_replay_record_t));
276 dsp->dsa_drr->drr_type = DRR_OBJECT;
277 drro->drr_object = object;
278 drro->drr_type = dnp->dn_type;
279 drro->drr_bonustype = dnp->dn_bonustype;
280 drro->drr_blksz = dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT;
281 drro->drr_bonuslen = dnp->dn_bonuslen;
282 drro->drr_checksumtype = dnp->dn_checksum;
283 drro->drr_compress = dnp->dn_compress;
284 drro->drr_toguid = dsp->dsa_toguid;
285
286 if (dump_bytes(dsp, dsp->dsa_drr, sizeof (dmu_replay_record_t)) != 0)
287 return (SET_ERROR(EINTR));
288
289 if (dump_bytes(dsp, DN_BONUS(dnp), P2ROUNDUP(dnp->dn_bonuslen, 8)) != 0)
290 return (SET_ERROR(EINTR));
291
292 /* free anything past the end of the file */
293 if (dump_free(dsp, object, (dnp->dn_maxblkid + 1) *
294 (dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT), -1ULL))
295 return (SET_ERROR(EINTR));
296 if (dsp->dsa_err != 0)
297 return (SET_ERROR(EINTR));
298 return (0);
299 }
300
301 #define BP_SPAN(dnp, level) \
302 (((uint64_t)dnp->dn_datablkszsec) << (SPA_MINBLOCKSHIFT + \
303 (level) * (dnp->dn_indblkshift - SPA_BLKPTRSHIFT)))
304
305 /* ARGSUSED */
306 static int
307 backup_cb(spa_t *spa, zilog_t *zilog, const blkptr_t *bp,
308 const zbookmark_t *zb, const dnode_phys_t *dnp, void *arg)
309 {
310 dmu_sendarg_t *dsp = arg;
311 dmu_object_type_t type = bp ? BP_GET_TYPE(bp) : DMU_OT_NONE;
312 int err = 0;
313
314 if (issig(JUSTLOOKING) && issig(FORREAL))
315 return (SET_ERROR(EINTR));
316
317 if (zb->zb_object != DMU_META_DNODE_OBJECT &&
318 DMU_OBJECT_IS_SPECIAL(zb->zb_object)) {
319 return (0);
320 } else if (bp == NULL && zb->zb_object == DMU_META_DNODE_OBJECT) {
321 uint64_t span = BP_SPAN(dnp, zb->zb_level);
322 uint64_t dnobj = (zb->zb_blkid * span) >> DNODE_SHIFT;
323 err = dump_freeobjects(dsp, dnobj, span >> DNODE_SHIFT);
324 } else if (bp == NULL) {
325 uint64_t span = BP_SPAN(dnp, zb->zb_level);
326 err = dump_free(dsp, zb->zb_object, zb->zb_blkid * span, span);
327 } else if (zb->zb_level > 0 || type == DMU_OT_OBJSET) {
328 return (0);
329 } else if (type == DMU_OT_DNODE) {
330 dnode_phys_t *blk;
331 int i;
332 int blksz = BP_GET_LSIZE(bp);
333 uint32_t aflags = ARC_WAIT;
334 arc_buf_t *abuf;
335
336 if (arc_read(NULL, spa, bp, arc_getbuf_func, &abuf,
337 ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL,
338 &aflags, zb) != 0)
339 return (SET_ERROR(EIO));
340
341 blk = abuf->b_data;
342 for (i = 0; i < blksz >> DNODE_SHIFT; i++) {
343 uint64_t dnobj = (zb->zb_blkid <<
344 (DNODE_BLOCK_SHIFT - DNODE_SHIFT)) + i;
345 err = dump_dnode(dsp, dnobj, blk+i);
346 if (err != 0)
347 break;
348 }
349 (void) arc_buf_remove_ref(abuf, &abuf);
350 } else if (type == DMU_OT_SA) {
351 uint32_t aflags = ARC_WAIT;
352 arc_buf_t *abuf;
353 int blksz = BP_GET_LSIZE(bp);
354
355 if (arc_read(NULL, spa, bp, arc_getbuf_func, &abuf,
356 ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL,
357 &aflags, zb) != 0)
358 return (SET_ERROR(EIO));
359
360 err = dump_spill(dsp, zb->zb_object, blksz, abuf->b_data);
361 (void) arc_buf_remove_ref(abuf, &abuf);
362 } else { /* it's a level-0 block of a regular object */
363 uint32_t aflags = ARC_WAIT;
364 arc_buf_t *abuf;
365 int blksz = BP_GET_LSIZE(bp);
366
367 if (arc_read(NULL, spa, bp, arc_getbuf_func, &abuf,
368 ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL,
369 &aflags, zb) != 0) {
370 if (zfs_send_corrupt_data) {
371 /* Send a block filled with 0x"zfs badd bloc" */
372 abuf = arc_buf_alloc(spa, blksz, &abuf,
373 ARC_BUFC_DATA);
374 uint64_t *ptr;
375 for (ptr = abuf->b_data;
376 (char *)ptr < (char *)abuf->b_data + blksz;
377 ptr++)
378 *ptr = 0x2f5baddb10c;
379 } else {
380 return (SET_ERROR(EIO));
381 }
382 }
383
384 err = dump_data(dsp, type, zb->zb_object, zb->zb_blkid * blksz,
385 blksz, bp, abuf->b_data);
386 (void) arc_buf_remove_ref(abuf, &abuf);
387 }
388
389 ASSERT(err == 0 || err == EINTR);
390 return (err);
391 }
392
393 /*
394 * Releases dp, ds, and fromds, using the specified tag.
395 */
396 static int
397 dmu_send_impl(void *tag, dsl_pool_t *dp, dsl_dataset_t *ds,
398 dsl_dataset_t *fromds, int outfd, vnode_t *vp, offset_t *off)
399 {
400 objset_t *os;
401 dmu_replay_record_t *drr;
402 dmu_sendarg_t *dsp;
403 int err;
404 uint64_t fromtxg = 0;
405
406 if (fromds != NULL && !dsl_dataset_is_before(ds, fromds)) {
407 dsl_dataset_rele(fromds, tag);
408 dsl_dataset_rele(ds, tag);
409 dsl_pool_rele(dp, tag);
410 return (SET_ERROR(EXDEV));
411 }
412
413 err = dmu_objset_from_ds(ds, &os);
414 if (err != 0) {
415 if (fromds != NULL)
416 dsl_dataset_rele(fromds, tag);
417 dsl_dataset_rele(ds, tag);
418 dsl_pool_rele(dp, tag);
419 return (err);
420 }
421
422 drr = kmem_zalloc(sizeof (dmu_replay_record_t), KM_SLEEP);
423 drr->drr_type = DRR_BEGIN;
424 drr->drr_u.drr_begin.drr_magic = DMU_BACKUP_MAGIC;
425 DMU_SET_STREAM_HDRTYPE(drr->drr_u.drr_begin.drr_versioninfo,
426 DMU_SUBSTREAM);
427
428 #ifdef _KERNEL
429 if (dmu_objset_type(os) == DMU_OST_ZFS) {
430 uint64_t version;
431 if (zfs_get_zplprop(os, ZFS_PROP_VERSION, &version) != 0) {
432 kmem_free(drr, sizeof (dmu_replay_record_t));
433 if (fromds != NULL)
434 dsl_dataset_rele(fromds, tag);
435 dsl_dataset_rele(ds, tag);
436 dsl_pool_rele(dp, tag);
437 return (SET_ERROR(EINVAL));
438 }
439 if (version >= ZPL_VERSION_SA) {
440 DMU_SET_FEATUREFLAGS(
441 drr->drr_u.drr_begin.drr_versioninfo,
442 DMU_BACKUP_FEATURE_SA_SPILL);
443 }
444 }
445 #endif
446
447 drr->drr_u.drr_begin.drr_creation_time =
448 ds->ds_phys->ds_creation_time;
449 drr->drr_u.drr_begin.drr_type = dmu_objset_type(os);
450 if (fromds != NULL && ds->ds_dir != fromds->ds_dir)
451 drr->drr_u.drr_begin.drr_flags |= DRR_FLAG_CLONE;
452 drr->drr_u.drr_begin.drr_toguid = ds->ds_phys->ds_guid;
453 if (ds->ds_phys->ds_flags & DS_FLAG_CI_DATASET)
454 drr->drr_u.drr_begin.drr_flags |= DRR_FLAG_CI_DATA;
455
456 if (fromds != NULL)
457 drr->drr_u.drr_begin.drr_fromguid = fromds->ds_phys->ds_guid;
458 dsl_dataset_name(ds, drr->drr_u.drr_begin.drr_toname);
459
460 if (fromds != NULL) {
461 fromtxg = fromds->ds_phys->ds_creation_txg;
462 dsl_dataset_rele(fromds, tag);
463 fromds = NULL;
464 }
465
466 dsp = kmem_zalloc(sizeof (dmu_sendarg_t), KM_SLEEP);
467
468 dsp->dsa_drr = drr;
469 dsp->dsa_vp = vp;
470 dsp->dsa_outfd = outfd;
471 dsp->dsa_proc = curproc;
472 dsp->dsa_os = os;
473 dsp->dsa_off = off;
474 dsp->dsa_toguid = ds->ds_phys->ds_guid;
475 ZIO_SET_CHECKSUM(&dsp->dsa_zc, 0, 0, 0, 0);
476 dsp->dsa_pending_op = PENDING_NONE;
477
478 mutex_enter(&ds->ds_sendstream_lock);
479 list_insert_head(&ds->ds_sendstreams, dsp);
480 mutex_exit(&ds->ds_sendstream_lock);
481
482 dsl_dataset_long_hold(ds, FTAG);
483 dsl_pool_rele(dp, tag);
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 = SET_ERROR(EINTR);
496
497 if (err != 0) {
498 if (err == EINTR && dsp->dsa_err != 0)
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 dsl_dataset_long_rele(ds, FTAG);
522 dsl_dataset_rele(ds, tag);
523
524 return (err);
525 }
526
527 int
528 dmu_send_obj(const char *pool, uint64_t tosnap, uint64_t fromsnap,
529 int outfd, vnode_t *vp, offset_t *off)
530 {
531 dsl_pool_t *dp;
532 dsl_dataset_t *ds;
533 dsl_dataset_t *fromds = NULL;
534 int err;
535
536 err = dsl_pool_hold(pool, FTAG, &dp);
537 if (err != 0)
538 return (err);
539
540 err = dsl_dataset_hold_obj(dp, tosnap, FTAG, &ds);
541 if (err != 0) {
542 dsl_pool_rele(dp, FTAG);
543 return (err);
544 }
545
546 if (fromsnap != 0) {
547 err = dsl_dataset_hold_obj(dp, fromsnap, FTAG, &fromds);
548 if (err != 0) {
549 dsl_dataset_rele(ds, FTAG);
550 dsl_pool_rele(dp, FTAG);
551 return (err);
552 }
553 }
554
555 return (dmu_send_impl(FTAG, dp, ds, fromds, outfd, vp, off));
556 }
557
558 int
559 dmu_send(const char *tosnap, const char *fromsnap,
560 int outfd, vnode_t *vp, offset_t *off)
561 {
562 dsl_pool_t *dp;
563 dsl_dataset_t *ds;
564 dsl_dataset_t *fromds = NULL;
565 int err;
566
567 if (strchr(tosnap, '@') == NULL)
568 return (SET_ERROR(EINVAL));
569 if (fromsnap != NULL && strchr(fromsnap, '@') == NULL)
570 return (SET_ERROR(EINVAL));
571
572 err = dsl_pool_hold(tosnap, FTAG, &dp);
573 if (err != 0)
574 return (err);
575
576 err = dsl_dataset_hold(dp, tosnap, FTAG, &ds);
577 if (err != 0) {
578 dsl_pool_rele(dp, FTAG);
579 return (err);
580 }
581
582 if (fromsnap != NULL) {
583 err = dsl_dataset_hold(dp, fromsnap, FTAG, &fromds);
584 if (err != 0) {
585 dsl_dataset_rele(ds, FTAG);
586 dsl_pool_rele(dp, FTAG);
587 return (err);
588 }
589 }
590 return (dmu_send_impl(FTAG, dp, ds, fromds, outfd, vp, off));
591 }
592
593 int
594 dmu_send_estimate(dsl_dataset_t *ds, dsl_dataset_t *fromds, uint64_t *sizep)
595 {
596 dsl_pool_t *dp = ds->ds_dir->dd_pool;
597 int err;
598 uint64_t size;
599
600 ASSERT(dsl_pool_config_held(dp));
601
602 /* tosnap must be a snapshot */
603 if (!dsl_dataset_is_snapshot(ds))
604 return (SET_ERROR(EINVAL));
605
606 /*
607 * fromsnap must be an earlier snapshot from the same fs as tosnap,
608 * or the origin's fs.
609 */
610 if (fromds != NULL && !dsl_dataset_is_before(ds, fromds))
611 return (SET_ERROR(EXDEV));
612
613 /* Get uncompressed size estimate of changed data. */
614 if (fromds == NULL) {
615 size = ds->ds_phys->ds_uncompressed_bytes;
616 } else {
617 uint64_t used, comp;
618 err = dsl_dataset_space_written(fromds, ds,
619 &used, &comp, &size);
620 if (err != 0)
621 return (err);
622 }
623
624 /*
625 * Assume that space (both on-disk and in-stream) is dominated by
626 * data. We will adjust for indirect blocks and the copies property,
627 * but ignore per-object space used (eg, dnodes and DRR_OBJECT records).
628 */
629
630 /*
631 * Subtract out approximate space used by indirect blocks.
632 * Assume most space is used by data blocks (non-indirect, non-dnode).
633 * Assume all blocks are recordsize. Assume ditto blocks and
634 * internal fragmentation counter out compression.
635 *
636 * Therefore, space used by indirect blocks is sizeof(blkptr_t) per
637 * block, which we observe in practice.
638 */
639 uint64_t recordsize;
640 err = dsl_prop_get_int_ds(ds, "recordsize", &recordsize);
641 if (err != 0)
642 return (err);
643 size -= size / recordsize * sizeof (blkptr_t);
644
645 /* Add in the space for the record associated with each block. */
646 size += size / recordsize * sizeof (dmu_replay_record_t);
647
648 *sizep = size;
649
650 return (0);
651 }
652
653 typedef struct dmu_recv_begin_arg {
654 const char *drba_origin;
655 dmu_recv_cookie_t *drba_cookie;
656 cred_t *drba_cred;
657 uint64_t drba_snapobj;
658 } dmu_recv_begin_arg_t;
659
660 static int
661 recv_begin_check_existing_impl(dmu_recv_begin_arg_t *drba, dsl_dataset_t *ds,
662 uint64_t fromguid)
663 {
664 uint64_t val;
665 int error;
666 dsl_pool_t *dp = ds->ds_dir->dd_pool;
667
668 /* temporary clone name must not exist */
669 error = zap_lookup(dp->dp_meta_objset,
670 ds->ds_dir->dd_phys->dd_child_dir_zapobj, recv_clone_name,
671 8, 1, &val);
672 if (error != ENOENT)
673 return (error == 0 ? EBUSY : error);
674
675 /* new snapshot name must not exist */
676 error = zap_lookup(dp->dp_meta_objset,
677 ds->ds_phys->ds_snapnames_zapobj, drba->drba_cookie->drc_tosnap,
678 8, 1, &val);
679 if (error != ENOENT)
680 return (error == 0 ? EEXIST : error);
681
682 if (fromguid != 0) {
683 dsl_dataset_t *snap;
684 uint64_t obj = ds->ds_phys->ds_prev_snap_obj;
685
686 /* Find snapshot in this dir that matches fromguid. */
687 while (obj != 0) {
688 error = dsl_dataset_hold_obj(dp, obj, FTAG,
689 &snap);
690 if (error != 0)
691 return (SET_ERROR(ENODEV));
692 if (snap->ds_dir != ds->ds_dir) {
693 dsl_dataset_rele(snap, FTAG);
694 return (SET_ERROR(ENODEV));
695 }
696 if (snap->ds_phys->ds_guid == fromguid)
697 break;
698 obj = snap->ds_phys->ds_prev_snap_obj;
699 dsl_dataset_rele(snap, FTAG);
700 }
701 if (obj == 0)
702 return (SET_ERROR(ENODEV));
703
704 if (drba->drba_cookie->drc_force) {
705 drba->drba_snapobj = obj;
706 } else {
707 /*
708 * If we are not forcing, there must be no
709 * changes since fromsnap.
710 */
711 if (dsl_dataset_modified_since_snap(ds, snap)) {
712 dsl_dataset_rele(snap, FTAG);
713 return (SET_ERROR(ETXTBSY));
714 }
715 drba->drba_snapobj = ds->ds_prev->ds_object;
716 }
717
718 dsl_dataset_rele(snap, FTAG);
719 } else {
720 /* if full, most recent snapshot must be $ORIGIN */
721 if (ds->ds_phys->ds_prev_snap_txg >= TXG_INITIAL)
722 return (SET_ERROR(ENODEV));
723 drba->drba_snapobj = ds->ds_phys->ds_prev_snap_obj;
724 }
725
726 return (0);
727
728 }
729
730 static int
731 dmu_recv_begin_check(void *arg, dmu_tx_t *tx)
732 {
733 dmu_recv_begin_arg_t *drba = arg;
734 dsl_pool_t *dp = dmu_tx_pool(tx);
735 struct drr_begin *drrb = drba->drba_cookie->drc_drrb;
736 uint64_t fromguid = drrb->drr_fromguid;
737 int flags = drrb->drr_flags;
738 int error;
739 dsl_dataset_t *ds;
740 const char *tofs = drba->drba_cookie->drc_tofs;
741
742 /* already checked */
743 ASSERT3U(drrb->drr_magic, ==, DMU_BACKUP_MAGIC);
744
745 if (DMU_GET_STREAM_HDRTYPE(drrb->drr_versioninfo) ==
746 DMU_COMPOUNDSTREAM ||
747 drrb->drr_type >= DMU_OST_NUMTYPES ||
748 ((flags & DRR_FLAG_CLONE) && drba->drba_origin == NULL))
749 return (SET_ERROR(EINVAL));
750
751 /* Verify pool version supports SA if SA_SPILL feature set */
752 if ((DMU_GET_FEATUREFLAGS(drrb->drr_versioninfo) &
753 DMU_BACKUP_FEATURE_SA_SPILL) &&
754 spa_version(dp->dp_spa) < SPA_VERSION_SA) {
755 return (SET_ERROR(ENOTSUP));
756 }
757
758 error = dsl_dataset_hold(dp, tofs, FTAG, &ds);
759 if (error == 0) {
760 /* target fs already exists; recv into temp clone */
761
762 /* Can't recv a clone into an existing fs */
763 if (flags & DRR_FLAG_CLONE) {
764 dsl_dataset_rele(ds, FTAG);
765 return (SET_ERROR(EINVAL));
766 }
767
768 error = recv_begin_check_existing_impl(drba, ds, fromguid);
769 dsl_dataset_rele(ds, FTAG);
770 } else if (error == ENOENT) {
771 /* target fs does not exist; must be a full backup or clone */
772 char buf[MAXNAMELEN];
773
774 /*
775 * If it's a non-clone incremental, we are missing the
776 * target fs, so fail the recv.
777 */
778 if (fromguid != 0 && !(flags & DRR_FLAG_CLONE))
779 return (SET_ERROR(ENOENT));
780
781 /* Open the parent of tofs */
782 ASSERT3U(strlen(tofs), <, MAXNAMELEN);
783 (void) strlcpy(buf, tofs, strrchr(tofs, '/') - tofs + 1);
784 error = dsl_dataset_hold(dp, buf, FTAG, &ds);
785 if (error != 0)
786 return (error);
787
788 if (drba->drba_origin != NULL) {
789 dsl_dataset_t *origin;
790 error = dsl_dataset_hold(dp, drba->drba_origin,
791 FTAG, &origin);
792 if (error != 0) {
793 dsl_dataset_rele(ds, FTAG);
794 return (error);
795 }
796 if (!dsl_dataset_is_snapshot(origin)) {
797 dsl_dataset_rele(origin, FTAG);
798 dsl_dataset_rele(ds, FTAG);
799 return (SET_ERROR(EINVAL));
800 }
801 if (origin->ds_phys->ds_guid != fromguid) {
802 dsl_dataset_rele(origin, FTAG);
803 dsl_dataset_rele(ds, FTAG);
804 return (SET_ERROR(ENODEV));
805 }
806 dsl_dataset_rele(origin, FTAG);
807 }
808 dsl_dataset_rele(ds, FTAG);
809 error = 0;
810 }
811 return (error);
812 }
813
814 static void
815 dmu_recv_begin_sync(void *arg, dmu_tx_t *tx)
816 {
817 dmu_recv_begin_arg_t *drba = arg;
818 dsl_pool_t *dp = dmu_tx_pool(tx);
819 struct drr_begin *drrb = drba->drba_cookie->drc_drrb;
820 const char *tofs = drba->drba_cookie->drc_tofs;
821 dsl_dataset_t *ds, *newds;
822 uint64_t dsobj;
823 int error;
824 uint64_t crflags;
825
826 crflags = (drrb->drr_flags & DRR_FLAG_CI_DATA) ?
827 DS_FLAG_CI_DATASET : 0;
828
829 error = dsl_dataset_hold(dp, tofs, FTAG, &ds);
830 if (error == 0) {
831 /* create temporary clone */
832 dsl_dataset_t *snap = NULL;
833 if (drba->drba_snapobj != 0) {
834 VERIFY0(dsl_dataset_hold_obj(dp,
835 drba->drba_snapobj, FTAG, &snap));
836 }
837 dsobj = dsl_dataset_create_sync(ds->ds_dir, recv_clone_name,
838 snap, crflags, drba->drba_cred, tx);
839 dsl_dataset_rele(snap, FTAG);
840 dsl_dataset_rele(ds, FTAG);
841 } else {
842 dsl_dir_t *dd;
843 const char *tail;
844 dsl_dataset_t *origin = NULL;
845
846 VERIFY0(dsl_dir_hold(dp, tofs, FTAG, &dd, &tail));
847
848 if (drba->drba_origin != NULL) {
849 VERIFY0(dsl_dataset_hold(dp, drba->drba_origin,
850 FTAG, &origin));
851 }
852
853 /* Create new dataset. */
854 dsobj = dsl_dataset_create_sync(dd,
855 strrchr(tofs, '/') + 1,
856 origin, crflags, drba->drba_cred, tx);
857 if (origin != NULL)
858 dsl_dataset_rele(origin, FTAG);
859 dsl_dir_rele(dd, FTAG);
860 drba->drba_cookie->drc_newfs = B_TRUE;
861 }
862 VERIFY0(dsl_dataset_own_obj(dp, dsobj, dmu_recv_tag, &newds));
863
864 dmu_buf_will_dirty(newds->ds_dbuf, tx);
865 newds->ds_phys->ds_flags |= DS_FLAG_INCONSISTENT;
866
867 /*
868 * If we actually created a non-clone, we need to create the
869 * objset in our new dataset.
870 */
871 if (BP_IS_HOLE(dsl_dataset_get_blkptr(newds))) {
872 (void) dmu_objset_create_impl(dp->dp_spa,
873 newds, dsl_dataset_get_blkptr(newds), drrb->drr_type, tx);
874 }
875
876 drba->drba_cookie->drc_ds = newds;
877
878 spa_history_log_internal_ds(newds, "receive", tx, "");
879 }
880
881 /*
882 * NB: callers *MUST* call dmu_recv_stream() if dmu_recv_begin()
883 * succeeds; otherwise we will leak the holds on the datasets.
884 */
885 int
886 dmu_recv_begin(char *tofs, char *tosnap, struct drr_begin *drrb,
887 boolean_t force, char *origin, dmu_recv_cookie_t *drc)
888 {
889 dmu_recv_begin_arg_t drba = { 0 };
890 dmu_replay_record_t *drr;
891
892 bzero(drc, sizeof (dmu_recv_cookie_t));
893 drc->drc_drrb = drrb;
894 drc->drc_tosnap = tosnap;
895 drc->drc_tofs = tofs;
896 drc->drc_force = force;
897
898 if (drrb->drr_magic == BSWAP_64(DMU_BACKUP_MAGIC))
899 drc->drc_byteswap = B_TRUE;
900 else if (drrb->drr_magic != DMU_BACKUP_MAGIC)
901 return (SET_ERROR(EINVAL));
902
903 drr = kmem_zalloc(sizeof (dmu_replay_record_t), KM_SLEEP);
904 drr->drr_type = DRR_BEGIN;
905 drr->drr_u.drr_begin = *drc->drc_drrb;
906 if (drc->drc_byteswap) {
907 fletcher_4_incremental_byteswap(drr,
908 sizeof (dmu_replay_record_t), &drc->drc_cksum);
909 } else {
910 fletcher_4_incremental_native(drr,
911 sizeof (dmu_replay_record_t), &drc->drc_cksum);
912 }
913 kmem_free(drr, sizeof (dmu_replay_record_t));
914
915 if (drc->drc_byteswap) {
916 drrb->drr_magic = BSWAP_64(drrb->drr_magic);
917 drrb->drr_versioninfo = BSWAP_64(drrb->drr_versioninfo);
918 drrb->drr_creation_time = BSWAP_64(drrb->drr_creation_time);
919 drrb->drr_type = BSWAP_32(drrb->drr_type);
920 drrb->drr_toguid = BSWAP_64(drrb->drr_toguid);
921 drrb->drr_fromguid = BSWAP_64(drrb->drr_fromguid);
922 }
923
924 drba.drba_origin = origin;
925 drba.drba_cookie = drc;
926 drba.drba_cred = CRED();
927
928 return (dsl_sync_task(tofs, dmu_recv_begin_check, dmu_recv_begin_sync,
929 &drba, 5));
930 }
931
932 struct restorearg {
933 int err;
934 boolean_t byteswap;
935 vnode_t *vp;
936 char *buf;
937 uint64_t voff;
938 int bufsize; /* amount of memory allocated for buf */
939 zio_cksum_t cksum;
940 avl_tree_t *guid_to_ds_map;
941 };
942
943 typedef struct guid_map_entry {
944 uint64_t guid;
945 dsl_dataset_t *gme_ds;
946 avl_node_t avlnode;
947 } guid_map_entry_t;
948
949 static int
950 guid_compare(const void *arg1, const void *arg2)
951 {
952 const guid_map_entry_t *gmep1 = arg1;
953 const guid_map_entry_t *gmep2 = arg2;
954
955 if (gmep1->guid < gmep2->guid)
956 return (-1);
957 else if (gmep1->guid > gmep2->guid)
958 return (1);
959 return (0);
960 }
961
962 static void
963 free_guid_map_onexit(void *arg)
964 {
965 avl_tree_t *ca = arg;
966 void *cookie = NULL;
967 guid_map_entry_t *gmep;
968
969 while ((gmep = avl_destroy_nodes(ca, &cookie)) != NULL) {
970 dsl_dataset_long_rele(gmep->gme_ds, gmep);
971 dsl_dataset_rele(gmep->gme_ds, gmep);
972 kmem_free(gmep, sizeof (guid_map_entry_t));
973 }
974 avl_destroy(ca);
975 kmem_free(ca, sizeof (avl_tree_t));
976 }
977
978 static void *
979 restore_read(struct restorearg *ra, int len)
980 {
981 void *rv;
982 int done = 0;
983
984 /* some things will require 8-byte alignment, so everything must */
985 ASSERT0(len % 8);
986
987 while (done < len) {
988 ssize_t resid;
989
990 ra->err = vn_rdwr(UIO_READ, ra->vp,
991 (caddr_t)ra->buf + done, len - done,
992 ra->voff, UIO_SYSSPACE, FAPPEND,
993 RLIM64_INFINITY, CRED(), &resid);
994
995 if (resid == len - done)
996 ra->err = SET_ERROR(EINVAL);
997 ra->voff += len - done - resid;
998 done = len - resid;
999 if (ra->err != 0)
1000 return (NULL);
1001 }
1002
1003 ASSERT3U(done, ==, len);
1004 rv = ra->buf;
1005 if (ra->byteswap)
1006 fletcher_4_incremental_byteswap(rv, len, &ra->cksum);
1007 else
1008 fletcher_4_incremental_native(rv, len, &ra->cksum);
1009 return (rv);
1010 }
1011
1012 static void
1013 backup_byteswap(dmu_replay_record_t *drr)
1014 {
1015 #define DO64(X) (drr->drr_u.X = BSWAP_64(drr->drr_u.X))
1016 #define DO32(X) (drr->drr_u.X = BSWAP_32(drr->drr_u.X))
1017 drr->drr_type = BSWAP_32(drr->drr_type);
1018 drr->drr_payloadlen = BSWAP_32(drr->drr_payloadlen);
1019 switch (drr->drr_type) {
1020 case DRR_BEGIN:
1021 DO64(drr_begin.drr_magic);
1022 DO64(drr_begin.drr_versioninfo);
1023 DO64(drr_begin.drr_creation_time);
1024 DO32(drr_begin.drr_type);
1025 DO32(drr_begin.drr_flags);
1026 DO64(drr_begin.drr_toguid);
1027 DO64(drr_begin.drr_fromguid);
1028 break;
1029 case DRR_OBJECT:
1030 DO64(drr_object.drr_object);
1031 /* DO64(drr_object.drr_allocation_txg); */
1032 DO32(drr_object.drr_type);
1033 DO32(drr_object.drr_bonustype);
1034 DO32(drr_object.drr_blksz);
1035 DO32(drr_object.drr_bonuslen);
1036 DO64(drr_object.drr_toguid);
1037 break;
1038 case DRR_FREEOBJECTS:
1039 DO64(drr_freeobjects.drr_firstobj);
1040 DO64(drr_freeobjects.drr_numobjs);
1041 DO64(drr_freeobjects.drr_toguid);
1042 break;
1043 case DRR_WRITE:
1044 DO64(drr_write.drr_object);
1045 DO32(drr_write.drr_type);
1046 DO64(drr_write.drr_offset);
1047 DO64(drr_write.drr_length);
1048 DO64(drr_write.drr_toguid);
1049 DO64(drr_write.drr_key.ddk_cksum.zc_word[0]);
1050 DO64(drr_write.drr_key.ddk_cksum.zc_word[1]);
1051 DO64(drr_write.drr_key.ddk_cksum.zc_word[2]);
1052 DO64(drr_write.drr_key.ddk_cksum.zc_word[3]);
1053 DO64(drr_write.drr_key.ddk_prop);
1054 break;
1055 case DRR_WRITE_BYREF:
1056 DO64(drr_write_byref.drr_object);
1057 DO64(drr_write_byref.drr_offset);
1058 DO64(drr_write_byref.drr_length);
1059 DO64(drr_write_byref.drr_toguid);
1060 DO64(drr_write_byref.drr_refguid);
1061 DO64(drr_write_byref.drr_refobject);
1062 DO64(drr_write_byref.drr_refoffset);
1063 DO64(drr_write_byref.drr_key.ddk_cksum.zc_word[0]);
1064 DO64(drr_write_byref.drr_key.ddk_cksum.zc_word[1]);
1065 DO64(drr_write_byref.drr_key.ddk_cksum.zc_word[2]);
1066 DO64(drr_write_byref.drr_key.ddk_cksum.zc_word[3]);
1067 DO64(drr_write_byref.drr_key.ddk_prop);
1068 break;
1069 case DRR_FREE:
1070 DO64(drr_free.drr_object);
1071 DO64(drr_free.drr_offset);
1072 DO64(drr_free.drr_length);
1073 DO64(drr_free.drr_toguid);
1074 break;
1075 case DRR_SPILL:
1076 DO64(drr_spill.drr_object);
1077 DO64(drr_spill.drr_length);
1078 DO64(drr_spill.drr_toguid);
1079 break;
1080 case DRR_END:
1081 DO64(drr_end.drr_checksum.zc_word[0]);
1082 DO64(drr_end.drr_checksum.zc_word[1]);
1083 DO64(drr_end.drr_checksum.zc_word[2]);
1084 DO64(drr_end.drr_checksum.zc_word[3]);
1085 DO64(drr_end.drr_toguid);
1086 break;
1087 }
1088 #undef DO64
1089 #undef DO32
1090 }
1091
1092 static int
1093 restore_object(struct restorearg *ra, objset_t *os, struct drr_object *drro)
1094 {
1095 int err;
1096 dmu_tx_t *tx;
1097 void *data = NULL;
1098
1099 if (drro->drr_type == DMU_OT_NONE ||
1100 !DMU_OT_IS_VALID(drro->drr_type) ||
1101 !DMU_OT_IS_VALID(drro->drr_bonustype) ||
1102 drro->drr_checksumtype >= ZIO_CHECKSUM_FUNCTIONS ||
1103 drro->drr_compress >= ZIO_COMPRESS_FUNCTIONS ||
1104 P2PHASE(drro->drr_blksz, SPA_MINBLOCKSIZE) ||
1105 drro->drr_blksz < SPA_MINBLOCKSIZE ||
1106 drro->drr_blksz > SPA_MAXBLOCKSIZE ||
1107 drro->drr_bonuslen > DN_MAX_BONUSLEN) {
1108 return (SET_ERROR(EINVAL));
1109 }
1110
1111 err = dmu_object_info(os, drro->drr_object, NULL);
1112
1113 if (err != 0 && err != ENOENT)
1114 return (SET_ERROR(EINVAL));
1115
1116 if (drro->drr_bonuslen) {
1117 data = restore_read(ra, P2ROUNDUP(drro->drr_bonuslen, 8));
1118 if (ra->err != 0)
1119 return (ra->err);
1120 }
1121
1122 if (err == ENOENT) {
1123 /* currently free, want to be allocated */
1124 tx = dmu_tx_create(os);
1125 dmu_tx_hold_bonus(tx, DMU_NEW_OBJECT);
1126 err = dmu_tx_assign(tx, TXG_WAIT);
1127 if (err != 0) {
1128 dmu_tx_abort(tx);
1129 return (err);
1130 }
1131 err = dmu_object_claim(os, drro->drr_object,
1132 drro->drr_type, drro->drr_blksz,
1133 drro->drr_bonustype, drro->drr_bonuslen, tx);
1134 dmu_tx_commit(tx);
1135 } else {
1136 /* currently allocated, want to be allocated */
1137 err = dmu_object_reclaim(os, drro->drr_object,
1138 drro->drr_type, drro->drr_blksz,
1139 drro->drr_bonustype, drro->drr_bonuslen);
1140 }
1141 if (err != 0) {
1142 return (SET_ERROR(EINVAL));
1143 }
1144
1145 tx = dmu_tx_create(os);
1146 dmu_tx_hold_bonus(tx, drro->drr_object);
1147 err = dmu_tx_assign(tx, TXG_WAIT);
1148 if (err != 0) {
1149 dmu_tx_abort(tx);
1150 return (err);
1151 }
1152
1153 dmu_object_set_checksum(os, drro->drr_object, drro->drr_checksumtype,
1154 tx);
1155 dmu_object_set_compress(os, drro->drr_object, drro->drr_compress, tx);
1156
1157 if (data != NULL) {
1158 dmu_buf_t *db;
1159
1160 VERIFY(0 == dmu_bonus_hold(os, drro->drr_object, FTAG, &db));
1161 dmu_buf_will_dirty(db, tx);
1162
1163 ASSERT3U(db->db_size, >=, drro->drr_bonuslen);
1164 bcopy(data, db->db_data, drro->drr_bonuslen);
1165 if (ra->byteswap) {
1166 dmu_object_byteswap_t byteswap =
1167 DMU_OT_BYTESWAP(drro->drr_bonustype);
1168 dmu_ot_byteswap[byteswap].ob_func(db->db_data,
1169 drro->drr_bonuslen);
1170 }
1171 dmu_buf_rele(db, FTAG);
1172 }
1173 dmu_tx_commit(tx);
1174 return (0);
1175 }
1176
1177 /* ARGSUSED */
1178 static int
1179 restore_freeobjects(struct restorearg *ra, objset_t *os,
1180 struct drr_freeobjects *drrfo)
1181 {
1182 uint64_t obj;
1183
1184 if (drrfo->drr_firstobj + drrfo->drr_numobjs < drrfo->drr_firstobj)
1185 return (SET_ERROR(EINVAL));
1186
1187 for (obj = drrfo->drr_firstobj;
1188 obj < drrfo->drr_firstobj + drrfo->drr_numobjs;
1189 (void) dmu_object_next(os, &obj, FALSE, 0)) {
1190 int err;
1191
1192 if (dmu_object_info(os, obj, NULL) != 0)
1193 continue;
1194
1195 err = dmu_free_object(os, obj);
1196 if (err != 0)
1197 return (err);
1198 }
1199 return (0);
1200 }
1201
1202 static int
1203 restore_write(struct restorearg *ra, objset_t *os,
1204 struct drr_write *drrw)
1205 {
1206 dmu_tx_t *tx;
1207 void *data;
1208 int err;
1209
1210 if (drrw->drr_offset + drrw->drr_length < drrw->drr_offset ||
1211 !DMU_OT_IS_VALID(drrw->drr_type))
1212 return (SET_ERROR(EINVAL));
1213
1214 data = restore_read(ra, drrw->drr_length);
1215 if (data == NULL)
1216 return (ra->err);
1217
1218 if (dmu_object_info(os, drrw->drr_object, NULL) != 0)
1219 return (SET_ERROR(EINVAL));
1220
1221 tx = dmu_tx_create(os);
1222
1223 dmu_tx_hold_write(tx, drrw->drr_object,
1224 drrw->drr_offset, drrw->drr_length);
1225 err = dmu_tx_assign(tx, TXG_WAIT);
1226 if (err != 0) {
1227 dmu_tx_abort(tx);
1228 return (err);
1229 }
1230 if (ra->byteswap) {
1231 dmu_object_byteswap_t byteswap =
1232 DMU_OT_BYTESWAP(drrw->drr_type);
1233 dmu_ot_byteswap[byteswap].ob_func(data, drrw->drr_length);
1234 }
1235 dmu_write(os, drrw->drr_object,
1236 drrw->drr_offset, drrw->drr_length, data, tx);
1237 dmu_tx_commit(tx);
1238 return (0);
1239 }
1240
1241 /*
1242 * Handle a DRR_WRITE_BYREF record. This record is used in dedup'ed
1243 * streams to refer to a copy of the data that is already on the
1244 * system because it came in earlier in the stream. This function
1245 * finds the earlier copy of the data, and uses that copy instead of
1246 * data from the stream to fulfill this write.
1247 */
1248 static int
1249 restore_write_byref(struct restorearg *ra, objset_t *os,
1250 struct drr_write_byref *drrwbr)
1251 {
1252 dmu_tx_t *tx;
1253 int err;
1254 guid_map_entry_t gmesrch;
1255 guid_map_entry_t *gmep;
1256 avl_index_t where;
1257 objset_t *ref_os = NULL;
1258 dmu_buf_t *dbp;
1259
1260 if (drrwbr->drr_offset + drrwbr->drr_length < drrwbr->drr_offset)
1261 return (SET_ERROR(EINVAL));
1262
1263 /*
1264 * If the GUID of the referenced dataset is different from the
1265 * GUID of the target dataset, find the referenced dataset.
1266 */
1267 if (drrwbr->drr_toguid != drrwbr->drr_refguid) {
1268 gmesrch.guid = drrwbr->drr_refguid;
1269 if ((gmep = avl_find(ra->guid_to_ds_map, &gmesrch,
1270 &where)) == NULL) {
1271 return (SET_ERROR(EINVAL));
1272 }
1273 if (dmu_objset_from_ds(gmep->gme_ds, &ref_os))
1274 return (SET_ERROR(EINVAL));
1275 } else {
1276 ref_os = os;
1277 }
1278
1279 if (err = dmu_buf_hold(ref_os, drrwbr->drr_refobject,
1280 drrwbr->drr_refoffset, FTAG, &dbp, DMU_READ_PREFETCH))
1281 return (err);
1282
1283 tx = dmu_tx_create(os);
1284
1285 dmu_tx_hold_write(tx, drrwbr->drr_object,
1286 drrwbr->drr_offset, drrwbr->drr_length);
1287 err = dmu_tx_assign(tx, TXG_WAIT);
1288 if (err != 0) {
1289 dmu_tx_abort(tx);
1290 return (err);
1291 }
1292 dmu_write(os, drrwbr->drr_object,
1293 drrwbr->drr_offset, drrwbr->drr_length, dbp->db_data, tx);
1294 dmu_buf_rele(dbp, FTAG);
1295 dmu_tx_commit(tx);
1296 return (0);
1297 }
1298
1299 static int
1300 restore_spill(struct restorearg *ra, objset_t *os, struct drr_spill *drrs)
1301 {
1302 dmu_tx_t *tx;
1303 void *data;
1304 dmu_buf_t *db, *db_spill;
1305 int err;
1306
1307 if (drrs->drr_length < SPA_MINBLOCKSIZE ||
1308 drrs->drr_length > SPA_MAXBLOCKSIZE)
1309 return (SET_ERROR(EINVAL));
1310
1311 data = restore_read(ra, drrs->drr_length);
1312 if (data == NULL)
1313 return (ra->err);
1314
1315 if (dmu_object_info(os, drrs->drr_object, NULL) != 0)
1316 return (SET_ERROR(EINVAL));
1317
1318 VERIFY(0 == dmu_bonus_hold(os, drrs->drr_object, FTAG, &db));
1319 if ((err = dmu_spill_hold_by_bonus(db, FTAG, &db_spill)) != 0) {
1320 dmu_buf_rele(db, FTAG);
1321 return (err);
1322 }
1323
1324 tx = dmu_tx_create(os);
1325
1326 dmu_tx_hold_spill(tx, db->db_object);
1327
1328 err = dmu_tx_assign(tx, TXG_WAIT);
1329 if (err != 0) {
1330 dmu_buf_rele(db, FTAG);
1331 dmu_buf_rele(db_spill, FTAG);
1332 dmu_tx_abort(tx);
1333 return (err);
1334 }
1335 dmu_buf_will_dirty(db_spill, tx);
1336
1337 if (db_spill->db_size < drrs->drr_length)
1338 VERIFY(0 == dbuf_spill_set_blksz(db_spill,
1339 drrs->drr_length, tx));
1340 bcopy(data, db_spill->db_data, drrs->drr_length);
1341
1342 dmu_buf_rele(db, FTAG);
1343 dmu_buf_rele(db_spill, FTAG);
1344
1345 dmu_tx_commit(tx);
1346 return (0);
1347 }
1348
1349 /* ARGSUSED */
1350 static int
1351 restore_free(struct restorearg *ra, objset_t *os,
1352 struct drr_free *drrf)
1353 {
1354 int err;
1355
1356 if (drrf->drr_length != -1ULL &&
1357 drrf->drr_offset + drrf->drr_length < drrf->drr_offset)
1358 return (SET_ERROR(EINVAL));
1359
1360 if (dmu_object_info(os, drrf->drr_object, NULL) != 0)
1361 return (SET_ERROR(EINVAL));
1362
1363 err = dmu_free_long_range(os, drrf->drr_object,
1364 drrf->drr_offset, drrf->drr_length);
1365 return (err);
1366 }
1367
1368 /* used to destroy the drc_ds on error */
1369 static void
1370 dmu_recv_cleanup_ds(dmu_recv_cookie_t *drc)
1371 {
1372 char name[MAXNAMELEN];
1373 dsl_dataset_name(drc->drc_ds, name);
1374 dsl_dataset_disown(drc->drc_ds, dmu_recv_tag);
1375 (void) dsl_destroy_head(name);
1376 }
1377
1378 /*
1379 * NB: callers *must* call dmu_recv_end() if this succeeds.
1380 */
1381 int
1382 dmu_recv_stream(dmu_recv_cookie_t *drc, vnode_t *vp, offset_t *voffp,
1383 int cleanup_fd, uint64_t *action_handlep)
1384 {
1385 struct restorearg ra = { 0 };
1386 dmu_replay_record_t *drr;
1387 objset_t *os;
1388 zio_cksum_t pcksum;
1389 int featureflags;
1390
1391 ra.byteswap = drc->drc_byteswap;
1392 ra.cksum = drc->drc_cksum;
1393 ra.vp = vp;
1394 ra.voff = *voffp;
1395 ra.bufsize = 1<<20;
1396 ra.buf = kmem_alloc(ra.bufsize, KM_SLEEP);
1397
1398 /* these were verified in dmu_recv_begin */
1399 ASSERT3U(DMU_GET_STREAM_HDRTYPE(drc->drc_drrb->drr_versioninfo), ==,
1400 DMU_SUBSTREAM);
1401 ASSERT3U(drc->drc_drrb->drr_type, <, DMU_OST_NUMTYPES);
1402
1403 /*
1404 * Open the objset we are modifying.
1405 */
1406 VERIFY0(dmu_objset_from_ds(drc->drc_ds, &os));
1407
1408 ASSERT(drc->drc_ds->ds_phys->ds_flags & DS_FLAG_INCONSISTENT);
1409
1410 featureflags = DMU_GET_FEATUREFLAGS(drc->drc_drrb->drr_versioninfo);
1411
1412 /* if this stream is dedup'ed, set up the avl tree for guid mapping */
1413 if (featureflags & DMU_BACKUP_FEATURE_DEDUP) {
1414 minor_t minor;
1415
1416 if (cleanup_fd == -1) {
1417 ra.err = SET_ERROR(EBADF);
1418 goto out;
1419 }
1420 ra.err = zfs_onexit_fd_hold(cleanup_fd, &minor);
1421 if (ra.err != 0) {
1422 cleanup_fd = -1;
1423 goto out;
1424 }
1425
1426 if (*action_handlep == 0) {
1427 ra.guid_to_ds_map =
1428 kmem_alloc(sizeof (avl_tree_t), KM_SLEEP);
1429 avl_create(ra.guid_to_ds_map, guid_compare,
1430 sizeof (guid_map_entry_t),
1431 offsetof(guid_map_entry_t, avlnode));
1432 ra.err = zfs_onexit_add_cb(minor,
1433 free_guid_map_onexit, ra.guid_to_ds_map,
1434 action_handlep);
1435 if (ra.err != 0)
1436 goto out;
1437 } else {
1438 ra.err = zfs_onexit_cb_data(minor, *action_handlep,
1439 (void **)&ra.guid_to_ds_map);
1440 if (ra.err != 0)
1441 goto out;
1442 }
1443
1444 drc->drc_guid_to_ds_map = ra.guid_to_ds_map;
1445 }
1446
1447 /*
1448 * Read records and process them.
1449 */
1450 pcksum = ra.cksum;
1451 while (ra.err == 0 &&
1452 NULL != (drr = restore_read(&ra, sizeof (*drr)))) {
1453 if (issig(JUSTLOOKING) && issig(FORREAL)) {
1454 ra.err = SET_ERROR(EINTR);
1455 goto out;
1456 }
1457
1458 if (ra.byteswap)
1459 backup_byteswap(drr);
1460
1461 switch (drr->drr_type) {
1462 case DRR_OBJECT:
1463 {
1464 /*
1465 * We need to make a copy of the record header,
1466 * because restore_{object,write} may need to
1467 * restore_read(), which will invalidate drr.
1468 */
1469 struct drr_object drro = drr->drr_u.drr_object;
1470 ra.err = restore_object(&ra, os, &drro);
1471 break;
1472 }
1473 case DRR_FREEOBJECTS:
1474 {
1475 struct drr_freeobjects drrfo =
1476 drr->drr_u.drr_freeobjects;
1477 ra.err = restore_freeobjects(&ra, os, &drrfo);
1478 break;
1479 }
1480 case DRR_WRITE:
1481 {
1482 struct drr_write drrw = drr->drr_u.drr_write;
1483 ra.err = restore_write(&ra, os, &drrw);
1484 break;
1485 }
1486 case DRR_WRITE_BYREF:
1487 {
1488 struct drr_write_byref drrwbr =
1489 drr->drr_u.drr_write_byref;
1490 ra.err = restore_write_byref(&ra, os, &drrwbr);
1491 break;
1492 }
1493 case DRR_FREE:
1494 {
1495 struct drr_free drrf = drr->drr_u.drr_free;
1496 ra.err = restore_free(&ra, os, &drrf);
1497 break;
1498 }
1499 case DRR_END:
1500 {
1501 struct drr_end drre = drr->drr_u.drr_end;
1502 /*
1503 * We compare against the *previous* checksum
1504 * value, because the stored checksum is of
1505 * everything before the DRR_END record.
1506 */
1507 if (!ZIO_CHECKSUM_EQUAL(drre.drr_checksum, pcksum))
1508 ra.err = SET_ERROR(ECKSUM);
1509 goto out;
1510 }
1511 case DRR_SPILL:
1512 {
1513 struct drr_spill drrs = drr->drr_u.drr_spill;
1514 ra.err = restore_spill(&ra, os, &drrs);
1515 break;
1516 }
1517 default:
1518 ra.err = SET_ERROR(EINVAL);
1519 goto out;
1520 }
1521 pcksum = ra.cksum;
1522 }
1523 ASSERT(ra.err != 0);
1524
1525 out:
1526 if ((featureflags & DMU_BACKUP_FEATURE_DEDUP) && (cleanup_fd != -1))
1527 zfs_onexit_fd_rele(cleanup_fd);
1528
1529 if (ra.err != 0) {
1530 /*
1531 * destroy what we created, so we don't leave it in the
1532 * inconsistent restoring state.
1533 */
1534 dmu_recv_cleanup_ds(drc);
1535 }
1536
1537 kmem_free(ra.buf, ra.bufsize);
1538 *voffp = ra.voff;
1539 return (ra.err);
1540 }
1541
1542 static int
1543 dmu_recv_end_check(void *arg, dmu_tx_t *tx)
1544 {
1545 dmu_recv_cookie_t *drc = arg;
1546 dsl_pool_t *dp = dmu_tx_pool(tx);
1547 int error;
1548
1549 ASSERT3P(drc->drc_ds->ds_owner, ==, dmu_recv_tag);
1550
1551 if (!drc->drc_newfs) {
1552 dsl_dataset_t *origin_head;
1553
1554 error = dsl_dataset_hold(dp, drc->drc_tofs, FTAG, &origin_head);
1555 if (error != 0)
1556 return (error);
1557 if (drc->drc_force) {
1558 /*
1559 * We will destroy any snapshots in tofs (i.e. before
1560 * origin_head) that are after the origin (which is
1561 * the snap before drc_ds, because drc_ds can not
1562 * have any snaps of its own).
1563 */
1564 uint64_t obj = origin_head->ds_phys->ds_prev_snap_obj;
1565 while (obj != drc->drc_ds->ds_phys->ds_prev_snap_obj) {
1566 dsl_dataset_t *snap;
1567 error = dsl_dataset_hold_obj(dp, obj, FTAG,
1568 &snap);
1569 if (error != 0)
1570 return (error);
1571 if (snap->ds_dir != origin_head->ds_dir)
1572 error = SET_ERROR(EINVAL);
1573 if (error == 0) {
1574 error = dsl_destroy_snapshot_check_impl(
1575 snap, B_FALSE);
1576 }
1577 obj = snap->ds_phys->ds_prev_snap_obj;
1578 dsl_dataset_rele(snap, FTAG);
1579 if (error != 0)
1580 return (error);
1581 }
1582 }
1583 error = dsl_dataset_clone_swap_check_impl(drc->drc_ds,
1584 origin_head, drc->drc_force, drc->drc_owner, tx);
1585 if (error != 0) {
1586 dsl_dataset_rele(origin_head, FTAG);
1587 return (error);
1588 }
1589 error = dsl_dataset_snapshot_check_impl(origin_head,
1590 drc->drc_tosnap, tx, B_TRUE);
1591 dsl_dataset_rele(origin_head, FTAG);
1592 if (error != 0)
1593 return (error);
1594
1595 error = dsl_destroy_head_check_impl(drc->drc_ds, 1);
1596 } else {
1597 error = dsl_dataset_snapshot_check_impl(drc->drc_ds,
1598 drc->drc_tosnap, tx, B_TRUE);
1599 }
1600 return (error);
1601 }
1602
1603 static void
1604 dmu_recv_end_sync(void *arg, dmu_tx_t *tx)
1605 {
1606 dmu_recv_cookie_t *drc = arg;
1607 dsl_pool_t *dp = dmu_tx_pool(tx);
1608
1609 spa_history_log_internal_ds(drc->drc_ds, "finish receiving",
1610 tx, "snap=%s", drc->drc_tosnap);
1611
1612 if (!drc->drc_newfs) {
1613 dsl_dataset_t *origin_head;
1614
1615 VERIFY0(dsl_dataset_hold(dp, drc->drc_tofs, FTAG,
1616 &origin_head));
1617
1618 if (drc->drc_force) {
1619 /*
1620 * Destroy any snapshots of drc_tofs (origin_head)
1621 * after the origin (the snap before drc_ds).
1622 */
1623 uint64_t obj = origin_head->ds_phys->ds_prev_snap_obj;
1624 while (obj != drc->drc_ds->ds_phys->ds_prev_snap_obj) {
1625 dsl_dataset_t *snap;
1626 VERIFY0(dsl_dataset_hold_obj(dp, obj, FTAG,
1627 &snap));
1628 ASSERT3P(snap->ds_dir, ==, origin_head->ds_dir);
1629 obj = snap->ds_phys->ds_prev_snap_obj;
1630 dsl_destroy_snapshot_sync_impl(snap,
1631 B_FALSE, tx);
1632 dsl_dataset_rele(snap, FTAG);
1633 }
1634 }
1635 VERIFY3P(drc->drc_ds->ds_prev, ==,
1636 origin_head->ds_prev);
1637
1638 dsl_dataset_clone_swap_sync_impl(drc->drc_ds,
1639 origin_head, tx);
1640 dsl_dataset_snapshot_sync_impl(origin_head,
1641 drc->drc_tosnap, tx);
1642
1643 /* set snapshot's creation time and guid */
1644 dmu_buf_will_dirty(origin_head->ds_prev->ds_dbuf, tx);
1645 origin_head->ds_prev->ds_phys->ds_creation_time =
1646 drc->drc_drrb->drr_creation_time;
1647 origin_head->ds_prev->ds_phys->ds_guid =
1648 drc->drc_drrb->drr_toguid;
1649 origin_head->ds_prev->ds_phys->ds_flags &=
1650 ~DS_FLAG_INCONSISTENT;
1651
1652 dmu_buf_will_dirty(origin_head->ds_dbuf, tx);
1653 origin_head->ds_phys->ds_flags &= ~DS_FLAG_INCONSISTENT;
1654
1655 dsl_dataset_rele(origin_head, FTAG);
1656 dsl_destroy_head_sync_impl(drc->drc_ds, tx);
1657
1658 if (drc->drc_owner != NULL)
1659 VERIFY3P(origin_head->ds_owner, ==, drc->drc_owner);
1660 } else {
1661 dsl_dataset_t *ds = drc->drc_ds;
1662
1663 dsl_dataset_snapshot_sync_impl(ds, drc->drc_tosnap, tx);
1664
1665 /* set snapshot's creation time and guid */
1666 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx);
1667 ds->ds_prev->ds_phys->ds_creation_time =
1668 drc->drc_drrb->drr_creation_time;
1669 ds->ds_prev->ds_phys->ds_guid = drc->drc_drrb->drr_toguid;
1670 ds->ds_prev->ds_phys->ds_flags &= ~DS_FLAG_INCONSISTENT;
1671
1672 dmu_buf_will_dirty(ds->ds_dbuf, tx);
1673 ds->ds_phys->ds_flags &= ~DS_FLAG_INCONSISTENT;
1674 }
1675 drc->drc_newsnapobj = drc->drc_ds->ds_phys->ds_prev_snap_obj;
1676 /*
1677 * Release the hold from dmu_recv_begin. This must be done before
1678 * we return to open context, so that when we free the dataset's dnode,
1679 * we can evict its bonus buffer.
1680 */
1681 dsl_dataset_disown(drc->drc_ds, dmu_recv_tag);
1682 drc->drc_ds = NULL;
1683 }
1684
1685 static int
1686 add_ds_to_guidmap(const char *name, avl_tree_t *guid_map, uint64_t snapobj)
1687 {
1688 dsl_pool_t *dp;
1689 dsl_dataset_t *snapds;
1690 guid_map_entry_t *gmep;
1691 int err;
1692
1693 ASSERT(guid_map != NULL);
1694
1695 err = dsl_pool_hold(name, FTAG, &dp);
1696 if (err != 0)
1697 return (err);
1698 gmep = kmem_alloc(sizeof (*gmep), KM_SLEEP);
1699 err = dsl_dataset_hold_obj(dp, snapobj, gmep, &snapds);
1700 if (err == 0) {
1701 gmep->guid = snapds->ds_phys->ds_guid;
1702 gmep->gme_ds = snapds;
1703 avl_add(guid_map, gmep);
1704 dsl_dataset_long_hold(snapds, gmep);
1705 } else {
1706 kmem_free(gmep, sizeof (*gmep));
1707 }
1708
1709 dsl_pool_rele(dp, FTAG);
1710 return (err);
1711 }
1712
1713 static int dmu_recv_end_modified_blocks = 3;
1714
1715 static int
1716 dmu_recv_existing_end(dmu_recv_cookie_t *drc)
1717 {
1718 int error;
1719 char name[MAXNAMELEN];
1720
1721 #ifdef _KERNEL
1722 /*
1723 * We will be destroying the ds; make sure its origin is unmounted if
1724 * necessary.
1725 */
1726 dsl_dataset_name(drc->drc_ds, name);
1727 zfs_destroy_unmount_origin(name);
1728 #endif
1729
1730 error = dsl_sync_task(drc->drc_tofs,
1731 dmu_recv_end_check, dmu_recv_end_sync, drc,
1732 dmu_recv_end_modified_blocks);
1733
1734 if (error != 0)
1735 dmu_recv_cleanup_ds(drc);
1736 return (error);
1737 }
1738
1739 static int
1740 dmu_recv_new_end(dmu_recv_cookie_t *drc)
1741 {
1742 int error;
1743
1744 error = dsl_sync_task(drc->drc_tofs,
1745 dmu_recv_end_check, dmu_recv_end_sync, drc,
1746 dmu_recv_end_modified_blocks);
1747
1748 if (error != 0) {
1749 dmu_recv_cleanup_ds(drc);
1750 } else if (drc->drc_guid_to_ds_map != NULL) {
1751 (void) add_ds_to_guidmap(drc->drc_tofs,
1752 drc->drc_guid_to_ds_map,
1753 drc->drc_newsnapobj);
1754 }
1755 return (error);
1756 }
1757
1758 int
1759 dmu_recv_end(dmu_recv_cookie_t *drc, void *owner)
1760 {
1761 drc->drc_owner = owner;
1762
1763 if (drc->drc_newfs)
1764 return (dmu_recv_new_end(drc));
1765 else
1766 return (dmu_recv_existing_end(drc));
1767 }
Unleashed OS