?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
1949 crash during reguid causes stale config
[unleashed.git] / usr / src / uts / common / fs / zfs / dmu_send.c
blobfc94f3580529340f49b516982ec468c7d330b038
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 */
25 /*
26 * Copyright 2011 Nexenta Systems, Inc. All rights reserved.
27 * Copyright (c) 2011 by Delphix. All rights reserved.
28 */
29
30 #include <sys/dmu.h>
31 #include <sys/dmu_impl.h>
32 #include <sys/dmu_tx.h>
33 #include <sys/dbuf.h>
34 #include <sys/dnode.h>
35 #include <sys/zfs_context.h>
36 #include <sys/dmu_objset.h>
37 #include <sys/dmu_traverse.h>
38 #include <sys/dsl_dataset.h>
39 #include <sys/dsl_dir.h>
40 #include <sys/dsl_prop.h>
41 #include <sys/dsl_pool.h>
42 #include <sys/dsl_synctask.h>
43 #include <sys/zfs_ioctl.h>
44 #include <sys/zap.h>
45 #include <sys/zio_checksum.h>
46 #include <sys/zfs_znode.h>
47 #include <zfs_fletcher.h>
48 #include <sys/avl.h>
49 #include <sys/ddt.h>
50 #include <sys/zfs_onexit.h>
51
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
57 /*
58 * The list of data whose inclusion in a send stream can be pending from
59 * one call to backup_cb to another. Multiple calls to dump_free() and
60 * dump_freeobjects() can be aggregated into a single DRR_FREE or
61 * DRR_FREEOBJECTS replay record.
62 */
63 typedef enum {
64 PENDING_NONE,
65 PENDING_FREE,
66 PENDING_FREEOBJECTS
67 } pendop_t;
68
69 struct backuparg {
70 dmu_replay_record_t *drr;
71 vnode_t *vp;
72 offset_t *off;
73 objset_t *os;
74 zio_cksum_t zc;
75 uint64_t toguid;
76 int err;
77 pendop_t pending_op;
78 };
79
80 static int
81 dump_bytes(struct backuparg *ba, void *buf, int len)
82 {
83 ssize_t resid; /* have to get resid to get detailed errno */
84 ASSERT3U(len % 8, ==, 0);
85
86 fletcher_4_incremental_native(buf, len, &ba->zc);
87 ba->err = vn_rdwr(UIO_WRITE, ba->vp,
88 (caddr_t)buf, len,
89 0, UIO_SYSSPACE, FAPPEND, RLIM64_INFINITY, CRED(), &resid);
90 *ba->off += len;
91 return (ba->err);
92 }
93
94 static int
95 dump_free(struct backuparg *ba, uint64_t object, uint64_t offset,
96 uint64_t length)
97 {
98 struct drr_free *drrf = &(ba->drr->drr_u.drr_free);
99
100 /*
101 * If there is a pending op, but it's not PENDING_FREE, push it out,
102 * since free block aggregation can only be done for blocks of the
103 * same type (i.e., DRR_FREE records can only be aggregated with
104 * other DRR_FREE records. DRR_FREEOBJECTS records can only be
105 * aggregated with other DRR_FREEOBJECTS records.
106 */
107 if (ba->pending_op != PENDING_NONE && ba->pending_op != PENDING_FREE) {
108 if (dump_bytes(ba, ba->drr, sizeof (dmu_replay_record_t)) != 0)
109 return (EINTR);
110 ba->pending_op = PENDING_NONE;
111 }
112
113 if (ba->pending_op == PENDING_FREE) {
114 /*
115 * There should never be a PENDING_FREE if length is -1
116 * (because dump_dnode is the only place where this
117 * function is called with a -1, and only after flushing
118 * any pending record).
119 */
120 ASSERT(length != -1ULL);
121 /*
122 * Check to see whether this free block can be aggregated
123 * with pending one.
124 */
125 if (drrf->drr_object == object && drrf->drr_offset +
126 drrf->drr_length == offset) {
127 drrf->drr_length += length;
128 return (0);
129 } else {
130 /* not a continuation. Push out pending record */
131 if (dump_bytes(ba, ba->drr,
132 sizeof (dmu_replay_record_t)) != 0)
133 return (EINTR);
134 ba->pending_op = PENDING_NONE;
135 }
136 }
137 /* create a FREE record and make it pending */
138 bzero(ba->drr, sizeof (dmu_replay_record_t));
139 ba->drr->drr_type = DRR_FREE;
140 drrf->drr_object = object;
141 drrf->drr_offset = offset;
142 drrf->drr_length = length;
143 drrf->drr_toguid = ba->toguid;
144 if (length == -1ULL) {
145 if (dump_bytes(ba, ba->drr, sizeof (dmu_replay_record_t)) != 0)
146 return (EINTR);
147 } else {
148 ba->pending_op = PENDING_FREE;
149 }
150
151 return (0);
152 }
153
154 static int
155 dump_data(struct backuparg *ba, dmu_object_type_t type,
156 uint64_t object, uint64_t offset, int blksz, const blkptr_t *bp, void *data)
157 {
158 struct drr_write *drrw = &(ba->drr->drr_u.drr_write);
159
160
161 /*
162 * If there is any kind of pending aggregation (currently either
163 * a grouping of free objects or free blocks), push it out to
164 * the stream, since aggregation can't be done across operations
165 * of different types.
166 */
167 if (ba->pending_op != PENDING_NONE) {
168 if (dump_bytes(ba, ba->drr, sizeof (dmu_replay_record_t)) != 0)
169 return (EINTR);
170 ba->pending_op = PENDING_NONE;
171 }
172 /* write a DATA record */
173 bzero(ba->drr, sizeof (dmu_replay_record_t));
174 ba->drr->drr_type = DRR_WRITE;
175 drrw->drr_object = object;
176 drrw->drr_type = type;
177 drrw->drr_offset = offset;
178 drrw->drr_length = blksz;
179 drrw->drr_toguid = ba->toguid;
180 drrw->drr_checksumtype = BP_GET_CHECKSUM(bp);
181 if (zio_checksum_table[drrw->drr_checksumtype].ci_dedup)
182 drrw->drr_checksumflags |= DRR_CHECKSUM_DEDUP;
183 DDK_SET_LSIZE(&drrw->drr_key, BP_GET_LSIZE(bp));
184 DDK_SET_PSIZE(&drrw->drr_key, BP_GET_PSIZE(bp));
185 DDK_SET_COMPRESS(&drrw->drr_key, BP_GET_COMPRESS(bp));
186 drrw->drr_key.ddk_cksum = bp->blk_cksum;
187
188 if (dump_bytes(ba, ba->drr, sizeof (dmu_replay_record_t)) != 0)
189 return (EINTR);
190 if (dump_bytes(ba, data, blksz) != 0)
191 return (EINTR);
192 return (0);
193 }
194
195 static int
196 dump_spill(struct backuparg *ba, uint64_t object, int blksz, void *data)
197 {
198 struct drr_spill *drrs = &(ba->drr->drr_u.drr_spill);
199
200 if (ba->pending_op != PENDING_NONE) {
201 if (dump_bytes(ba, ba->drr, sizeof (dmu_replay_record_t)) != 0)
202 return (EINTR);
203 ba->pending_op = PENDING_NONE;
204 }
205
206 /* write a SPILL record */
207 bzero(ba->drr, sizeof (dmu_replay_record_t));
208 ba->drr->drr_type = DRR_SPILL;
209 drrs->drr_object = object;
210 drrs->drr_length = blksz;
211 drrs->drr_toguid = ba->toguid;
212
213 if (dump_bytes(ba, ba->drr, sizeof (dmu_replay_record_t)))
214 return (EINTR);
215 if (dump_bytes(ba, data, blksz))
216 return (EINTR);
217 return (0);
218 }
219
220 static int
221 dump_freeobjects(struct backuparg *ba, uint64_t firstobj, uint64_t numobjs)
222 {
223 struct drr_freeobjects *drrfo = &(ba->drr->drr_u.drr_freeobjects);
224
225 /*
226 * If there is a pending op, but it's not PENDING_FREEOBJECTS,
227 * push it out, since free block aggregation can only be done for
228 * blocks of the same type (i.e., DRR_FREE records can only be
229 * aggregated with other DRR_FREE records. DRR_FREEOBJECTS records
230 * can only be aggregated with other DRR_FREEOBJECTS records.
231 */
232 if (ba->pending_op != PENDING_NONE &&
233 ba->pending_op != PENDING_FREEOBJECTS) {
234 if (dump_bytes(ba, ba->drr, sizeof (dmu_replay_record_t)) != 0)
235 return (EINTR);
236 ba->pending_op = PENDING_NONE;
237 }
238 if (ba->pending_op == PENDING_FREEOBJECTS) {
239 /*
240 * See whether this free object array can be aggregated
241 * with pending one
242 */
243 if (drrfo->drr_firstobj + drrfo->drr_numobjs == firstobj) {
244 drrfo->drr_numobjs += numobjs;
245 return (0);
246 } else {
247 /* can't be aggregated. Push out pending record */
248 if (dump_bytes(ba, ba->drr,
249 sizeof (dmu_replay_record_t)) != 0)
250 return (EINTR);
251 ba->pending_op = PENDING_NONE;
252 }
253 }
254
255 /* write a FREEOBJECTS record */
256 bzero(ba->drr, sizeof (dmu_replay_record_t));
257 ba->drr->drr_type = DRR_FREEOBJECTS;
258 drrfo->drr_firstobj = firstobj;
259 drrfo->drr_numobjs = numobjs;
260 drrfo->drr_toguid = ba->toguid;
261
262 ba->pending_op = PENDING_FREEOBJECTS;
263
264 return (0);
265 }
266
267 static int
268 dump_dnode(struct backuparg *ba, uint64_t object, dnode_phys_t *dnp)
269 {
270 struct drr_object *drro = &(ba->drr->drr_u.drr_object);
271
272 if (dnp == NULL || dnp->dn_type == DMU_OT_NONE)
273 return (dump_freeobjects(ba, object, 1));
274
275 if (ba->pending_op != PENDING_NONE) {
276 if (dump_bytes(ba, ba->drr, sizeof (dmu_replay_record_t)) != 0)
277 return (EINTR);
278 ba->pending_op = PENDING_NONE;
279 }
280
281 /* write an OBJECT record */
282 bzero(ba->drr, sizeof (dmu_replay_record_t));
283 ba->drr->drr_type = DRR_OBJECT;
284 drro->drr_object = object;
285 drro->drr_type = dnp->dn_type;
286 drro->drr_bonustype = dnp->dn_bonustype;
287 drro->drr_blksz = dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT;
288 drro->drr_bonuslen = dnp->dn_bonuslen;
289 drro->drr_checksumtype = dnp->dn_checksum;
290 drro->drr_compress = dnp->dn_compress;
291 drro->drr_toguid = ba->toguid;
292
293 if (dump_bytes(ba, ba->drr, sizeof (dmu_replay_record_t)) != 0)
294 return (EINTR);
295
296 if (dump_bytes(ba, DN_BONUS(dnp), P2ROUNDUP(dnp->dn_bonuslen, 8)) != 0)
297 return (EINTR);
298
299 /* free anything past the end of the file */
300 if (dump_free(ba, object, (dnp->dn_maxblkid + 1) *
301 (dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT), -1ULL))
302 return (EINTR);
303 if (ba->err)
304 return (EINTR);
305 return (0);
306 }
307
308 #define BP_SPAN(dnp, level) \
309 (((uint64_t)dnp->dn_datablkszsec) << (SPA_MINBLOCKSHIFT + \
310 (level) * (dnp->dn_indblkshift - SPA_BLKPTRSHIFT)))
311
312 /* ARGSUSED */
313 static int
314 backup_cb(spa_t *spa, zilog_t *zilog, const blkptr_t *bp, arc_buf_t *pbuf,
315 const zbookmark_t *zb, const dnode_phys_t *dnp, void *arg)
316 {
317 struct backuparg *ba = arg;
318 dmu_object_type_t type = bp ? BP_GET_TYPE(bp) : DMU_OT_NONE;
319 int err = 0;
320
321 if (issig(JUSTLOOKING) && issig(FORREAL))
322 return (EINTR);
323
324 if (zb->zb_object != DMU_META_DNODE_OBJECT &&
325 DMU_OBJECT_IS_SPECIAL(zb->zb_object)) {
326 return (0);
327 } else if (bp == NULL && zb->zb_object == DMU_META_DNODE_OBJECT) {
328 uint64_t span = BP_SPAN(dnp, zb->zb_level);
329 uint64_t dnobj = (zb->zb_blkid * span) >> DNODE_SHIFT;
330 err = dump_freeobjects(ba, dnobj, span >> DNODE_SHIFT);
331 } else if (bp == NULL) {
332 uint64_t span = BP_SPAN(dnp, zb->zb_level);
333 err = dump_free(ba, zb->zb_object, zb->zb_blkid * span, span);
334 } else if (zb->zb_level > 0 || type == DMU_OT_OBJSET) {
335 return (0);
336 } else if (type == DMU_OT_DNODE) {
337 dnode_phys_t *blk;
338 int i;
339 int blksz = BP_GET_LSIZE(bp);
340 uint32_t aflags = ARC_WAIT;
341 arc_buf_t *abuf;
342
343 if (dsl_read(NULL, spa, bp, pbuf,
344 arc_getbuf_func, &abuf, ZIO_PRIORITY_ASYNC_READ,
345 ZIO_FLAG_CANFAIL, &aflags, zb) != 0)
346 return (EIO);
347
348 blk = abuf->b_data;
349 for (i = 0; i < blksz >> DNODE_SHIFT; i++) {
350 uint64_t dnobj = (zb->zb_blkid <<
351 (DNODE_BLOCK_SHIFT - DNODE_SHIFT)) + i;
352 err = dump_dnode(ba, dnobj, blk+i);
353 if (err)
354 break;
355 }
356 (void) arc_buf_remove_ref(abuf, &abuf);
357 } else if (type == DMU_OT_SA) {
358 uint32_t aflags = ARC_WAIT;
359 arc_buf_t *abuf;
360 int blksz = BP_GET_LSIZE(bp);
361
362 if (arc_read_nolock(NULL, spa, bp,
363 arc_getbuf_func, &abuf, ZIO_PRIORITY_ASYNC_READ,
364 ZIO_FLAG_CANFAIL, &aflags, zb) != 0)
365 return (EIO);
366
367 err = dump_spill(ba, zb->zb_object, blksz, abuf->b_data);
368 (void) arc_buf_remove_ref(abuf, &abuf);
369 } else { /* it's a level-0 block of a regular object */
370 uint32_t aflags = ARC_WAIT;
371 arc_buf_t *abuf;
372 int blksz = BP_GET_LSIZE(bp);
373
374 if (dsl_read(NULL, spa, bp, pbuf,
375 arc_getbuf_func, &abuf, ZIO_PRIORITY_ASYNC_READ,
376 ZIO_FLAG_CANFAIL, &aflags, zb) != 0) {
377 if (zfs_send_corrupt_data) {
378 /* Send a block filled with 0x"zfs badd bloc" */
379 abuf = arc_buf_alloc(spa, blksz, &abuf,
380 ARC_BUFC_DATA);
381 uint64_t *ptr;
382 for (ptr = abuf->b_data;
383 (char *)ptr < (char *)abuf->b_data + blksz;
384 ptr++)
385 *ptr = 0x2f5baddb10c;
386 } else {
387 return (EIO);
388 }
389 }
390
391 err = dump_data(ba, type, zb->zb_object, zb->zb_blkid * blksz,
392 blksz, bp, abuf->b_data);
393 (void) arc_buf_remove_ref(abuf, &abuf);
394 }
395
396 ASSERT(err == 0 || err == EINTR);
397 return (err);
398 }
399
400 int
401 dmu_sendbackup(objset_t *tosnap, objset_t *fromsnap, boolean_t fromorigin,
402 vnode_t *vp, offset_t *off)
403 {
404 dsl_dataset_t *ds = tosnap->os_dsl_dataset;
405 dsl_dataset_t *fromds = fromsnap ? fromsnap->os_dsl_dataset : NULL;
406 dmu_replay_record_t *drr;
407 struct backuparg ba;
408 int err;
409 uint64_t fromtxg = 0;
410
411 /* tosnap must be a snapshot */
412 if (ds->ds_phys->ds_next_snap_obj == 0)
413 return (EINVAL);
414
415 /* fromsnap must be an earlier snapshot from the same fs as tosnap */
416 if (fromds && (ds->ds_dir != fromds->ds_dir ||
417 fromds->ds_phys->ds_creation_txg >= ds->ds_phys->ds_creation_txg))
418 return (EXDEV);
419
420 if (fromorigin) {
421 dsl_pool_t *dp = ds->ds_dir->dd_pool;
422
423 if (fromsnap)
424 return (EINVAL);
425
426 if (dsl_dir_is_clone(ds->ds_dir)) {
427 rw_enter(&dp->dp_config_rwlock, RW_READER);
428 err = dsl_dataset_hold_obj(dp,
429 ds->ds_dir->dd_phys->dd_origin_obj, FTAG, &fromds);
430 rw_exit(&dp->dp_config_rwlock);
431 if (err)
432 return (err);
433 } else {
434 fromorigin = B_FALSE;
435 }
436 }
437
438
439 drr = kmem_zalloc(sizeof (dmu_replay_record_t), KM_SLEEP);
440 drr->drr_type = DRR_BEGIN;
441 drr->drr_u.drr_begin.drr_magic = DMU_BACKUP_MAGIC;
442 DMU_SET_STREAM_HDRTYPE(drr->drr_u.drr_begin.drr_versioninfo,
443 DMU_SUBSTREAM);
444
445 #ifdef _KERNEL
446 if (dmu_objset_type(tosnap) == DMU_OST_ZFS) {
447 uint64_t version;
448 if (zfs_get_zplprop(tosnap, ZFS_PROP_VERSION, &version) != 0)
449 return (EINVAL);
450 if (version == ZPL_VERSION_SA) {
451 DMU_SET_FEATUREFLAGS(
452 drr->drr_u.drr_begin.drr_versioninfo,
453 DMU_BACKUP_FEATURE_SA_SPILL);
454 }
455 }
456 #endif
457
458 drr->drr_u.drr_begin.drr_creation_time =
459 ds->ds_phys->ds_creation_time;
460 drr->drr_u.drr_begin.drr_type = tosnap->os_phys->os_type;
461 if (fromorigin)
462 drr->drr_u.drr_begin.drr_flags |= DRR_FLAG_CLONE;
463 drr->drr_u.drr_begin.drr_toguid = ds->ds_phys->ds_guid;
464 if (ds->ds_phys->ds_flags & DS_FLAG_CI_DATASET)
465 drr->drr_u.drr_begin.drr_flags |= DRR_FLAG_CI_DATA;
466
467 if (fromds)
468 drr->drr_u.drr_begin.drr_fromguid = fromds->ds_phys->ds_guid;
469 dsl_dataset_name(ds, drr->drr_u.drr_begin.drr_toname);
470
471 if (fromds)
472 fromtxg = fromds->ds_phys->ds_creation_txg;
473 if (fromorigin)
474 dsl_dataset_rele(fromds, FTAG);
475
476 ba.drr = drr;
477 ba.vp = vp;
478 ba.os = tosnap;
479 ba.off = off;
480 ba.toguid = ds->ds_phys->ds_guid;
481 ZIO_SET_CHECKSUM(&ba.zc, 0, 0, 0, 0);
482 ba.pending_op = PENDING_NONE;
483
484 if (dump_bytes(&ba, drr, sizeof (dmu_replay_record_t)) != 0) {
485 kmem_free(drr, sizeof (dmu_replay_record_t));
486 return (ba.err);
487 }
488
489 err = traverse_dataset(ds, fromtxg, TRAVERSE_PRE | TRAVERSE_PREFETCH,
490 backup_cb, &ba);
491
492 if (ba.pending_op != PENDING_NONE)
493 if (dump_bytes(&ba, drr, sizeof (dmu_replay_record_t)) != 0)
494 err = EINTR;
495
496 if (err) {
497 if (err == EINTR && ba.err)
498 err = ba.err;
499 kmem_free(drr, sizeof (dmu_replay_record_t));
500 return (err);
501 }
502
503 bzero(drr, sizeof (dmu_replay_record_t));
504 drr->drr_type = DRR_END;
505 drr->drr_u.drr_end.drr_checksum = ba.zc;
506 drr->drr_u.drr_end.drr_toguid = ba.toguid;
507
508 if (dump_bytes(&ba, drr, sizeof (dmu_replay_record_t)) != 0) {
509 kmem_free(drr, sizeof (dmu_replay_record_t));
510 return (ba.err);
511 }
512
513 kmem_free(drr, sizeof (dmu_replay_record_t));
514
515 return (0);
516 }
517
518 int
519 dmu_send_estimate(objset_t *tosnap, objset_t *fromsnap, boolean_t fromorigin,
520 uint64_t *sizep)
521 {
522 dsl_dataset_t *ds = tosnap->os_dsl_dataset;
523 dsl_dataset_t *fromds = fromsnap ? fromsnap->os_dsl_dataset : NULL;
524 dsl_pool_t *dp = ds->ds_dir->dd_pool;
525 int err;
526 uint64_t size;
527
528 /* tosnap must be a snapshot */
529 if (ds->ds_phys->ds_next_snap_obj == 0)
530 return (EINVAL);
531
532 /* fromsnap must be an earlier snapshot from the same fs as tosnap */
533 if (fromds && (ds->ds_dir != fromds->ds_dir ||
534 fromds->ds_phys->ds_creation_txg >= ds->ds_phys->ds_creation_txg))
535 return (EXDEV);
536
537 if (fromorigin) {
538 if (fromsnap)
539 return (EINVAL);
540
541 if (dsl_dir_is_clone(ds->ds_dir)) {
542 rw_enter(&dp->dp_config_rwlock, RW_READER);
543 err = dsl_dataset_hold_obj(dp,
544 ds->ds_dir->dd_phys->dd_origin_obj, FTAG, &fromds);
545 rw_exit(&dp->dp_config_rwlock);
546 if (err)
547 return (err);
548 } else {
549 fromorigin = B_FALSE;
550 }
551 }
552
553 /* Get uncompressed size estimate of changed data. */
554 if (fromds == NULL) {
555 size = ds->ds_phys->ds_uncompressed_bytes;
556 } else {
557 uint64_t used, comp;
558 err = dsl_dataset_space_written(fromds, ds,
559 &used, &comp, &size);
560 if (fromorigin)
561 dsl_dataset_rele(fromds, FTAG);
562 if (err)
563 return (err);
564 }
565
566 /*
567 * Assume that space (both on-disk and in-stream) is dominated by
568 * data. We will adjust for indirect blocks and the copies property,
569 * but ignore per-object space used (eg, dnodes and DRR_OBJECT records).
570 */
571
572 /*
573 * Subtract out approximate space used by indirect blocks.
574 * Assume most space is used by data blocks (non-indirect, non-dnode).
575 * Assume all blocks are recordsize. Assume ditto blocks and
576 * internal fragmentation counter out compression.
577 *
578 * Therefore, space used by indirect blocks is sizeof(blkptr_t) per
579 * block, which we observe in practice.
580 */
581 uint64_t recordsize;
582 rw_enter(&dp->dp_config_rwlock, RW_READER);
583 err = dsl_prop_get_ds(ds, "recordsize",
584 sizeof (recordsize), 1, &recordsize, NULL);
585 rw_exit(&dp->dp_config_rwlock);
586 if (err)
587 return (err);
588 size -= size / recordsize * sizeof (blkptr_t);
589
590 /* Add in the space for the record associated with each block. */
591 size += size / recordsize * sizeof (dmu_replay_record_t);
592
593 *sizep = size;
594
595 return (0);
596 }
597
598 struct recvbeginsyncarg {
599 const char *tofs;
600 const char *tosnap;
601 dsl_dataset_t *origin;
602 uint64_t fromguid;
603 dmu_objset_type_t type;
604 void *tag;
605 boolean_t force;
606 uint64_t dsflags;
607 char clonelastname[MAXNAMELEN];
608 dsl_dataset_t *ds; /* the ds to recv into; returned from the syncfunc */
609 cred_t *cr;
610 };
611
612 /* ARGSUSED */
613 static int
614 recv_new_check(void *arg1, void *arg2, dmu_tx_t *tx)
615 {
616 dsl_dir_t *dd = arg1;
617 struct recvbeginsyncarg *rbsa = arg2;
618 objset_t *mos = dd->dd_pool->dp_meta_objset;
619 uint64_t val;
620 int err;
621
622 err = zap_lookup(mos, dd->dd_phys->dd_child_dir_zapobj,
623 strrchr(rbsa->tofs, '/') + 1, sizeof (uint64_t), 1, &val);
624
625 if (err != ENOENT)
626 return (err ? err : EEXIST);
627
628 if (rbsa->origin) {
629 /* make sure it's a snap in the same pool */
630 if (rbsa->origin->ds_dir->dd_pool != dd->dd_pool)
631 return (EXDEV);
632 if (!dsl_dataset_is_snapshot(rbsa->origin))
633 return (EINVAL);
634 if (rbsa->origin->ds_phys->ds_guid != rbsa->fromguid)
635 return (ENODEV);
636 }
637
638 return (0);
639 }
640
641 static void
642 recv_new_sync(void *arg1, void *arg2, dmu_tx_t *tx)
643 {
644 dsl_dir_t *dd = arg1;
645 struct recvbeginsyncarg *rbsa = arg2;
646 uint64_t flags = DS_FLAG_INCONSISTENT | rbsa->dsflags;
647 uint64_t dsobj;
648
649 /* Create and open new dataset. */
650 dsobj = dsl_dataset_create_sync(dd, strrchr(rbsa->tofs, '/') + 1,
651 rbsa->origin, flags, rbsa->cr, tx);
652 VERIFY(0 == dsl_dataset_own_obj(dd->dd_pool, dsobj,
653 B_TRUE, dmu_recv_tag, &rbsa->ds));
654
655 if (rbsa->origin == NULL) {
656 (void) dmu_objset_create_impl(dd->dd_pool->dp_spa,
657 rbsa->ds, &rbsa->ds->ds_phys->ds_bp, rbsa->type, tx);
658 }
659
660 spa_history_log_internal(LOG_DS_REPLAY_FULL_SYNC,
661 dd->dd_pool->dp_spa, tx, "dataset = %lld", dsobj);
662 }
663
664 /* ARGSUSED */
665 static int
666 recv_existing_check(void *arg1, void *arg2, dmu_tx_t *tx)
667 {
668 dsl_dataset_t *ds = arg1;
669 struct recvbeginsyncarg *rbsa = arg2;
670 int err;
671 uint64_t val;
672
673 /* must not have any changes since most recent snapshot */
674 if (!rbsa->force && dsl_dataset_modified_since_lastsnap(ds))
675 return (ETXTBSY);
676
677 /* new snapshot name must not exist */
678 err = zap_lookup(ds->ds_dir->dd_pool->dp_meta_objset,
679 ds->ds_phys->ds_snapnames_zapobj, rbsa->tosnap, 8, 1, &val);
680 if (err == 0)
681 return (EEXIST);
682 if (err != ENOENT)
683 return (err);
684
685 if (rbsa->fromguid) {
686 /* if incremental, most recent snapshot must match fromguid */
687 if (ds->ds_prev == NULL)
688 return (ENODEV);
689
690 /*
691 * most recent snapshot must match fromguid, or there are no
692 * changes since the fromguid one
693 */
694 if (ds->ds_prev->ds_phys->ds_guid != rbsa->fromguid) {
695 uint64_t birth = ds->ds_prev->ds_phys->ds_bp.blk_birth;
696 uint64_t obj = ds->ds_prev->ds_phys->ds_prev_snap_obj;
697 while (obj != 0) {
698 dsl_dataset_t *snap;
699 err = dsl_dataset_hold_obj(ds->ds_dir->dd_pool,
700 obj, FTAG, &snap);
701 if (err)
702 return (ENODEV);
703 if (snap->ds_phys->ds_creation_txg < birth) {
704 dsl_dataset_rele(snap, FTAG);
705 return (ENODEV);
706 }
707 if (snap->ds_phys->ds_guid == rbsa->fromguid) {
708 dsl_dataset_rele(snap, FTAG);
709 break; /* it's ok */
710 }
711 obj = snap->ds_phys->ds_prev_snap_obj;
712 dsl_dataset_rele(snap, FTAG);
713 }
714 if (obj == 0)
715 return (ENODEV);
716 }
717 } else {
718 /* if full, most recent snapshot must be $ORIGIN */
719 if (ds->ds_phys->ds_prev_snap_txg >= TXG_INITIAL)
720 return (ENODEV);
721 }
722
723 /* temporary clone name must not exist */
724 err = zap_lookup(ds->ds_dir->dd_pool->dp_meta_objset,
725 ds->ds_dir->dd_phys->dd_child_dir_zapobj,
726 rbsa->clonelastname, 8, 1, &val);
727 if (err == 0)
728 return (EEXIST);
729 if (err != ENOENT)
730 return (err);
731
732 return (0);
733 }
734
735 /* ARGSUSED */
736 static void
737 recv_existing_sync(void *arg1, void *arg2, dmu_tx_t *tx)
738 {
739 dsl_dataset_t *ohds = arg1;
740 struct recvbeginsyncarg *rbsa = arg2;
741 dsl_pool_t *dp = ohds->ds_dir->dd_pool;
742 dsl_dataset_t *cds;
743 uint64_t flags = DS_FLAG_INCONSISTENT | rbsa->dsflags;
744 uint64_t dsobj;
745
746 /* create and open the temporary clone */
747 dsobj = dsl_dataset_create_sync(ohds->ds_dir, rbsa->clonelastname,
748 ohds->ds_prev, flags, rbsa->cr, tx);
749 VERIFY(0 == dsl_dataset_own_obj(dp, dsobj, B_TRUE, dmu_recv_tag, &cds));
750
751 /*
752 * If we actually created a non-clone, we need to create the
753 * objset in our new dataset.
754 */
755 if (BP_IS_HOLE(dsl_dataset_get_blkptr(cds))) {
756 (void) dmu_objset_create_impl(dp->dp_spa,
757 cds, dsl_dataset_get_blkptr(cds), rbsa->type, tx);
758 }
759
760 rbsa->ds = cds;
761
762 spa_history_log_internal(LOG_DS_REPLAY_INC_SYNC,
763 dp->dp_spa, tx, "dataset = %lld", dsobj);
764 }
765
766 static boolean_t
767 dmu_recv_verify_features(dsl_dataset_t *ds, struct drr_begin *drrb)
768 {
769 int featureflags;
770
771 featureflags = DMU_GET_FEATUREFLAGS(drrb->drr_versioninfo);
772
773 /* Verify pool version supports SA if SA_SPILL feature set */
774 return ((featureflags & DMU_BACKUP_FEATURE_SA_SPILL) &&
775 (spa_version(dsl_dataset_get_spa(ds)) < SPA_VERSION_SA));
776 }
777
778 /*
779 * NB: callers *MUST* call dmu_recv_stream() if dmu_recv_begin()
780 * succeeds; otherwise we will leak the holds on the datasets.
781 */
782 int
783 dmu_recv_begin(char *tofs, char *tosnap, char *top_ds, struct drr_begin *drrb,
784 boolean_t force, objset_t *origin, dmu_recv_cookie_t *drc)
785 {
786 int err = 0;
787 boolean_t byteswap;
788 struct recvbeginsyncarg rbsa = { 0 };
789 uint64_t versioninfo;
790 int flags;
791 dsl_dataset_t *ds;
792
793 if (drrb->drr_magic == DMU_BACKUP_MAGIC)
794 byteswap = FALSE;
795 else if (drrb->drr_magic == BSWAP_64(DMU_BACKUP_MAGIC))
796 byteswap = TRUE;
797 else
798 return (EINVAL);
799
800 rbsa.tofs = tofs;
801 rbsa.tosnap = tosnap;
802 rbsa.origin = origin ? origin->os_dsl_dataset : NULL;
803 rbsa.fromguid = drrb->drr_fromguid;
804 rbsa.type = drrb->drr_type;
805 rbsa.tag = FTAG;
806 rbsa.dsflags = 0;
807 rbsa.cr = CRED();
808 versioninfo = drrb->drr_versioninfo;
809 flags = drrb->drr_flags;
810
811 if (byteswap) {
812 rbsa.type = BSWAP_32(rbsa.type);
813 rbsa.fromguid = BSWAP_64(rbsa.fromguid);
814 versioninfo = BSWAP_64(versioninfo);
815 flags = BSWAP_32(flags);
816 }
817
818 if (DMU_GET_STREAM_HDRTYPE(versioninfo) == DMU_COMPOUNDSTREAM ||
819 rbsa.type >= DMU_OST_NUMTYPES ||
820 ((flags & DRR_FLAG_CLONE) && origin == NULL))
821 return (EINVAL);
822
823 if (flags & DRR_FLAG_CI_DATA)
824 rbsa.dsflags = DS_FLAG_CI_DATASET;
825
826 bzero(drc, sizeof (dmu_recv_cookie_t));
827 drc->drc_drrb = drrb;
828 drc->drc_tosnap = tosnap;
829 drc->drc_top_ds = top_ds;
830 drc->drc_force = force;
831
832 /*
833 * Process the begin in syncing context.
834 */
835
836 /* open the dataset we are logically receiving into */
837 err = dsl_dataset_hold(tofs, dmu_recv_tag, &ds);
838 if (err == 0) {
839 if (dmu_recv_verify_features(ds, drrb)) {
840 dsl_dataset_rele(ds, dmu_recv_tag);
841 return (ENOTSUP);
842 }
843 /* target fs already exists; recv into temp clone */
844
845 /* Can't recv a clone into an existing fs */
846 if (flags & DRR_FLAG_CLONE) {
847 dsl_dataset_rele(ds, dmu_recv_tag);
848 return (EINVAL);
849 }
850
851 /* must not have an incremental recv already in progress */
852 if (!mutex_tryenter(&ds->ds_recvlock)) {
853 dsl_dataset_rele(ds, dmu_recv_tag);
854 return (EBUSY);
855 }
856
857 /* tmp clone name is: tofs/%tosnap" */
858 (void) snprintf(rbsa.clonelastname, sizeof (rbsa.clonelastname),
859 "%%%s", tosnap);
860 rbsa.force = force;
861 err = dsl_sync_task_do(ds->ds_dir->dd_pool,
862 recv_existing_check, recv_existing_sync, ds, &rbsa, 5);
863 if (err) {
864 mutex_exit(&ds->ds_recvlock);
865 dsl_dataset_rele(ds, dmu_recv_tag);
866 return (err);
867 }
868 drc->drc_logical_ds = ds;
869 drc->drc_real_ds = rbsa.ds;
870 } else if (err == ENOENT) {
871 /* target fs does not exist; must be a full backup or clone */
872 char *cp;
873
874 /*
875 * If it's a non-clone incremental, we are missing the
876 * target fs, so fail the recv.
877 */
878 if (rbsa.fromguid && !(flags & DRR_FLAG_CLONE))
879 return (ENOENT);
880
881 /* Open the parent of tofs */
882 cp = strrchr(tofs, '/');
883 *cp = '\0';
884 err = dsl_dataset_hold(tofs, FTAG, &ds);
885 *cp = '/';
886 if (err)
887 return (err);
888
889 if (dmu_recv_verify_features(ds, drrb)) {
890 dsl_dataset_rele(ds, FTAG);
891 return (ENOTSUP);
892 }
893
894 err = dsl_sync_task_do(ds->ds_dir->dd_pool,
895 recv_new_check, recv_new_sync, ds->ds_dir, &rbsa, 5);
896 dsl_dataset_rele(ds, FTAG);
897 if (err)
898 return (err);
899 drc->drc_logical_ds = drc->drc_real_ds = rbsa.ds;
900 drc->drc_newfs = B_TRUE;
901 }
902
903 return (err);
904 }
905
906 struct restorearg {
907 int err;
908 int byteswap;
909 vnode_t *vp;
910 char *buf;
911 uint64_t voff;
912 int bufsize; /* amount of memory allocated for buf */
913 zio_cksum_t cksum;
914 avl_tree_t *guid_to_ds_map;
915 };
916
917 typedef struct guid_map_entry {
918 uint64_t guid;
919 dsl_dataset_t *gme_ds;
920 avl_node_t avlnode;
921 } guid_map_entry_t;
922
923 static int
924 guid_compare(const void *arg1, const void *arg2)
925 {
926 const guid_map_entry_t *gmep1 = arg1;
927 const guid_map_entry_t *gmep2 = arg2;
928
929 if (gmep1->guid < gmep2->guid)
930 return (-1);
931 else if (gmep1->guid > gmep2->guid)
932 return (1);
933 return (0);
934 }
935
936 static void
937 free_guid_map_onexit(void *arg)
938 {
939 avl_tree_t *ca = arg;
940 void *cookie = NULL;
941 guid_map_entry_t *gmep;
942
943 while ((gmep = avl_destroy_nodes(ca, &cookie)) != NULL) {
944 dsl_dataset_rele(gmep->gme_ds, ca);
945 kmem_free(gmep, sizeof (guid_map_entry_t));
946 }
947 avl_destroy(ca);
948 kmem_free(ca, sizeof (avl_tree_t));
949 }
950
951 static void *
952 restore_read(struct restorearg *ra, int len)
953 {
954 void *rv;
955 int done = 0;
956
957 /* some things will require 8-byte alignment, so everything must */
958 ASSERT3U(len % 8, ==, 0);
959
960 while (done < len) {
961 ssize_t resid;
962
963 ra->err = vn_rdwr(UIO_READ, ra->vp,
964 (caddr_t)ra->buf + done, len - done,
965 ra->voff, UIO_SYSSPACE, FAPPEND,
966 RLIM64_INFINITY, CRED(), &resid);
967
968 if (resid == len - done)
969 ra->err = EINVAL;
970 ra->voff += len - done - resid;
971 done = len - resid;
972 if (ra->err)
973 return (NULL);
974 }
975
976 ASSERT3U(done, ==, len);
977 rv = ra->buf;
978 if (ra->byteswap)
979 fletcher_4_incremental_byteswap(rv, len, &ra->cksum);
980 else
981 fletcher_4_incremental_native(rv, len, &ra->cksum);
982 return (rv);
983 }
984
985 static void
986 backup_byteswap(dmu_replay_record_t *drr)
987 {
988 #define DO64(X) (drr->drr_u.X = BSWAP_64(drr->drr_u.X))
989 #define DO32(X) (drr->drr_u.X = BSWAP_32(drr->drr_u.X))
990 drr->drr_type = BSWAP_32(drr->drr_type);
991 drr->drr_payloadlen = BSWAP_32(drr->drr_payloadlen);
992 switch (drr->drr_type) {
993 case DRR_BEGIN:
994 DO64(drr_begin.drr_magic);
995 DO64(drr_begin.drr_versioninfo);
996 DO64(drr_begin.drr_creation_time);
997 DO32(drr_begin.drr_type);
998 DO32(drr_begin.drr_flags);
999 DO64(drr_begin.drr_toguid);
1000 DO64(drr_begin.drr_fromguid);
1001 break;
1002 case DRR_OBJECT:
1003 DO64(drr_object.drr_object);
1004 /* DO64(drr_object.drr_allocation_txg); */
1005 DO32(drr_object.drr_type);
1006 DO32(drr_object.drr_bonustype);
1007 DO32(drr_object.drr_blksz);
1008 DO32(drr_object.drr_bonuslen);
1009 DO64(drr_object.drr_toguid);
1010 break;
1011 case DRR_FREEOBJECTS:
1012 DO64(drr_freeobjects.drr_firstobj);
1013 DO64(drr_freeobjects.drr_numobjs);
1014 DO64(drr_freeobjects.drr_toguid);
1015 break;
1016 case DRR_WRITE:
1017 DO64(drr_write.drr_object);
1018 DO32(drr_write.drr_type);
1019 DO64(drr_write.drr_offset);
1020 DO64(drr_write.drr_length);
1021 DO64(drr_write.drr_toguid);
1022 DO64(drr_write.drr_key.ddk_cksum.zc_word[0]);
1023 DO64(drr_write.drr_key.ddk_cksum.zc_word[1]);
1024 DO64(drr_write.drr_key.ddk_cksum.zc_word[2]);
1025 DO64(drr_write.drr_key.ddk_cksum.zc_word[3]);
1026 DO64(drr_write.drr_key.ddk_prop);
1027 break;
1028 case DRR_WRITE_BYREF:
1029 DO64(drr_write_byref.drr_object);
1030 DO64(drr_write_byref.drr_offset);
1031 DO64(drr_write_byref.drr_length);
1032 DO64(drr_write_byref.drr_toguid);
1033 DO64(drr_write_byref.drr_refguid);
1034 DO64(drr_write_byref.drr_refobject);
1035 DO64(drr_write_byref.drr_refoffset);
1036 DO64(drr_write_byref.drr_key.ddk_cksum.zc_word[0]);
1037 DO64(drr_write_byref.drr_key.ddk_cksum.zc_word[1]);
1038 DO64(drr_write_byref.drr_key.ddk_cksum.zc_word[2]);
1039 DO64(drr_write_byref.drr_key.ddk_cksum.zc_word[3]);
1040 DO64(drr_write_byref.drr_key.ddk_prop);
1041 break;
1042 case DRR_FREE:
1043 DO64(drr_free.drr_object);
1044 DO64(drr_free.drr_offset);
1045 DO64(drr_free.drr_length);
1046 DO64(drr_free.drr_toguid);
1047 break;
1048 case DRR_SPILL:
1049 DO64(drr_spill.drr_object);
1050 DO64(drr_spill.drr_length);
1051 DO64(drr_spill.drr_toguid);
1052 break;
1053 case DRR_END:
1054 DO64(drr_end.drr_checksum.zc_word[0]);
1055 DO64(drr_end.drr_checksum.zc_word[1]);
1056 DO64(drr_end.drr_checksum.zc_word[2]);
1057 DO64(drr_end.drr_checksum.zc_word[3]);
1058 DO64(drr_end.drr_toguid);
1059 break;
1060 }
1061 #undef DO64
1062 #undef DO32
1063 }
1064
1065 static int
1066 restore_object(struct restorearg *ra, objset_t *os, struct drr_object *drro)
1067 {
1068 int err;
1069 dmu_tx_t *tx;
1070 void *data = NULL;
1071
1072 if (drro->drr_type == DMU_OT_NONE ||
1073 drro->drr_type >= DMU_OT_NUMTYPES ||
1074 drro->drr_bonustype >= DMU_OT_NUMTYPES ||
1075 drro->drr_checksumtype >= ZIO_CHECKSUM_FUNCTIONS ||
1076 drro->drr_compress >= ZIO_COMPRESS_FUNCTIONS ||
1077 P2PHASE(drro->drr_blksz, SPA_MINBLOCKSIZE) ||
1078 drro->drr_blksz < SPA_MINBLOCKSIZE ||
1079 drro->drr_blksz > SPA_MAXBLOCKSIZE ||
1080 drro->drr_bonuslen > DN_MAX_BONUSLEN) {
1081 return (EINVAL);
1082 }
1083
1084 err = dmu_object_info(os, drro->drr_object, NULL);
1085
1086 if (err != 0 && err != ENOENT)
1087 return (EINVAL);
1088
1089 if (drro->drr_bonuslen) {
1090 data = restore_read(ra, P2ROUNDUP(drro->drr_bonuslen, 8));
1091 if (ra->err)
1092 return (ra->err);
1093 }
1094
1095 if (err == ENOENT) {
1096 /* currently free, want to be allocated */
1097 tx = dmu_tx_create(os);
1098 dmu_tx_hold_bonus(tx, DMU_NEW_OBJECT);
1099 err = dmu_tx_assign(tx, TXG_WAIT);
1100 if (err) {
1101 dmu_tx_abort(tx);
1102 return (err);
1103 }
1104 err = dmu_object_claim(os, drro->drr_object,
1105 drro->drr_type, drro->drr_blksz,
1106 drro->drr_bonustype, drro->drr_bonuslen, tx);
1107 dmu_tx_commit(tx);
1108 } else {
1109 /* currently allocated, want to be allocated */
1110 err = dmu_object_reclaim(os, drro->drr_object,
1111 drro->drr_type, drro->drr_blksz,
1112 drro->drr_bonustype, drro->drr_bonuslen);
1113 }
1114 if (err) {
1115 return (EINVAL);
1116 }
1117
1118 tx = dmu_tx_create(os);
1119 dmu_tx_hold_bonus(tx, drro->drr_object);
1120 err = dmu_tx_assign(tx, TXG_WAIT);
1121 if (err) {
1122 dmu_tx_abort(tx);
1123 return (err);
1124 }
1125
1126 dmu_object_set_checksum(os, drro->drr_object, drro->drr_checksumtype,
1127 tx);
1128 dmu_object_set_compress(os, drro->drr_object, drro->drr_compress, tx);
1129
1130 if (data != NULL) {
1131 dmu_buf_t *db;
1132
1133 VERIFY(0 == dmu_bonus_hold(os, drro->drr_object, FTAG, &db));
1134 dmu_buf_will_dirty(db, tx);
1135
1136 ASSERT3U(db->db_size, >=, drro->drr_bonuslen);
1137 bcopy(data, db->db_data, drro->drr_bonuslen);
1138 if (ra->byteswap) {
1139 dmu_ot[drro->drr_bonustype].ot_byteswap(db->db_data,
1140 drro->drr_bonuslen);
1141 }
1142 dmu_buf_rele(db, FTAG);
1143 }
1144 dmu_tx_commit(tx);
1145 return (0);
1146 }
1147
1148 /* ARGSUSED */
1149 static int
1150 restore_freeobjects(struct restorearg *ra, objset_t *os,
1151 struct drr_freeobjects *drrfo)
1152 {
1153 uint64_t obj;
1154
1155 if (drrfo->drr_firstobj + drrfo->drr_numobjs < drrfo->drr_firstobj)
1156 return (EINVAL);
1157
1158 for (obj = drrfo->drr_firstobj;
1159 obj < drrfo->drr_firstobj + drrfo->drr_numobjs;
1160 (void) dmu_object_next(os, &obj, FALSE, 0)) {
1161 int err;
1162
1163 if (dmu_object_info(os, obj, NULL) != 0)
1164 continue;
1165
1166 err = dmu_free_object(os, obj);
1167 if (err)
1168 return (err);
1169 }
1170 return (0);
1171 }
1172
1173 static int
1174 restore_write(struct restorearg *ra, objset_t *os,
1175 struct drr_write *drrw)
1176 {
1177 dmu_tx_t *tx;
1178 void *data;
1179 int err;
1180
1181 if (drrw->drr_offset + drrw->drr_length < drrw->drr_offset ||
1182 drrw->drr_type >= DMU_OT_NUMTYPES)
1183 return (EINVAL);
1184
1185 data = restore_read(ra, drrw->drr_length);
1186 if (data == NULL)
1187 return (ra->err);
1188
1189 if (dmu_object_info(os, drrw->drr_object, NULL) != 0)
1190 return (EINVAL);
1191
1192 tx = dmu_tx_create(os);
1193
1194 dmu_tx_hold_write(tx, drrw->drr_object,
1195 drrw->drr_offset, drrw->drr_length);
1196 err = dmu_tx_assign(tx, TXG_WAIT);
1197 if (err) {
1198 dmu_tx_abort(tx);
1199 return (err);
1200 }
1201 if (ra->byteswap)
1202 dmu_ot[drrw->drr_type].ot_byteswap(data, drrw->drr_length);
1203 dmu_write(os, drrw->drr_object,
1204 drrw->drr_offset, drrw->drr_length, data, tx);
1205 dmu_tx_commit(tx);
1206 return (0);
1207 }
1208
1209 /*
1210 * Handle a DRR_WRITE_BYREF record. This record is used in dedup'ed
1211 * streams to refer to a copy of the data that is already on the
1212 * system because it came in earlier in the stream. This function
1213 * finds the earlier copy of the data, and uses that copy instead of
1214 * data from the stream to fulfill this write.
1215 */
1216 static int
1217 restore_write_byref(struct restorearg *ra, objset_t *os,
1218 struct drr_write_byref *drrwbr)
1219 {
1220 dmu_tx_t *tx;
1221 int err;
1222 guid_map_entry_t gmesrch;
1223 guid_map_entry_t *gmep;
1224 avl_index_t where;
1225 objset_t *ref_os = NULL;
1226 dmu_buf_t *dbp;
1227
1228 if (drrwbr->drr_offset + drrwbr->drr_length < drrwbr->drr_offset)
1229 return (EINVAL);
1230
1231 /*
1232 * If the GUID of the referenced dataset is different from the
1233 * GUID of the target dataset, find the referenced dataset.
1234 */
1235 if (drrwbr->drr_toguid != drrwbr->drr_refguid) {
1236 gmesrch.guid = drrwbr->drr_refguid;
1237 if ((gmep = avl_find(ra->guid_to_ds_map, &gmesrch,
1238 &where)) == NULL) {
1239 return (EINVAL);
1240 }
1241 if (dmu_objset_from_ds(gmep->gme_ds, &ref_os))
1242 return (EINVAL);
1243 } else {
1244 ref_os = os;
1245 }
1246
1247 if (err = dmu_buf_hold(ref_os, drrwbr->drr_refobject,
1248 drrwbr->drr_refoffset, FTAG, &dbp, DMU_READ_PREFETCH))
1249 return (err);
1250
1251 tx = dmu_tx_create(os);
1252
1253 dmu_tx_hold_write(tx, drrwbr->drr_object,
1254 drrwbr->drr_offset, drrwbr->drr_length);
1255 err = dmu_tx_assign(tx, TXG_WAIT);
1256 if (err) {
1257 dmu_tx_abort(tx);
1258 return (err);
1259 }
1260 dmu_write(os, drrwbr->drr_object,
1261 drrwbr->drr_offset, drrwbr->drr_length, dbp->db_data, tx);
1262 dmu_buf_rele(dbp, FTAG);
1263 dmu_tx_commit(tx);
1264 return (0);
1265 }
1266
1267 static int
1268 restore_spill(struct restorearg *ra, objset_t *os, struct drr_spill *drrs)
1269 {
1270 dmu_tx_t *tx;
1271 void *data;
1272 dmu_buf_t *db, *db_spill;
1273 int err;
1274
1275 if (drrs->drr_length < SPA_MINBLOCKSIZE ||
1276 drrs->drr_length > SPA_MAXBLOCKSIZE)
1277 return (EINVAL);
1278
1279 data = restore_read(ra, drrs->drr_length);
1280 if (data == NULL)
1281 return (ra->err);
1282
1283 if (dmu_object_info(os, drrs->drr_object, NULL) != 0)
1284 return (EINVAL);
1285
1286 VERIFY(0 == dmu_bonus_hold(os, drrs->drr_object, FTAG, &db));
1287 if ((err = dmu_spill_hold_by_bonus(db, FTAG, &db_spill)) != 0) {
1288 dmu_buf_rele(db, FTAG);
1289 return (err);
1290 }
1291
1292 tx = dmu_tx_create(os);
1293
1294 dmu_tx_hold_spill(tx, db->db_object);
1295
1296 err = dmu_tx_assign(tx, TXG_WAIT);
1297 if (err) {
1298 dmu_buf_rele(db, FTAG);
1299 dmu_buf_rele(db_spill, FTAG);
1300 dmu_tx_abort(tx);
1301 return (err);
1302 }
1303 dmu_buf_will_dirty(db_spill, tx);
1304
1305 if (db_spill->db_size < drrs->drr_length)
1306 VERIFY(0 == dbuf_spill_set_blksz(db_spill,
1307 drrs->drr_length, tx));
1308 bcopy(data, db_spill->db_data, drrs->drr_length);
1309
1310 dmu_buf_rele(db, FTAG);
1311 dmu_buf_rele(db_spill, FTAG);
1312
1313 dmu_tx_commit(tx);
1314 return (0);
1315 }
1316
1317 /* ARGSUSED */
1318 static int
1319 restore_free(struct restorearg *ra, objset_t *os,
1320 struct drr_free *drrf)
1321 {
1322 int err;
1323
1324 if (drrf->drr_length != -1ULL &&
1325 drrf->drr_offset + drrf->drr_length < drrf->drr_offset)
1326 return (EINVAL);
1327
1328 if (dmu_object_info(os, drrf->drr_object, NULL) != 0)
1329 return (EINVAL);
1330
1331 err = dmu_free_long_range(os, drrf->drr_object,
1332 drrf->drr_offset, drrf->drr_length);
1333 return (err);
1334 }
1335
1336 /*
1337 * NB: callers *must* call dmu_recv_end() if this succeeds.
1338 */
1339 int
1340 dmu_recv_stream(dmu_recv_cookie_t *drc, vnode_t *vp, offset_t *voffp,
1341 int cleanup_fd, uint64_t *action_handlep)
1342 {
1343 struct restorearg ra = { 0 };
1344 dmu_replay_record_t *drr;
1345 objset_t *os;
1346 zio_cksum_t pcksum;
1347 int featureflags;
1348
1349 if (drc->drc_drrb->drr_magic == BSWAP_64(DMU_BACKUP_MAGIC))
1350 ra.byteswap = TRUE;
1351
1352 {
1353 /* compute checksum of drr_begin record */
1354 dmu_replay_record_t *drr;
1355 drr = kmem_zalloc(sizeof (dmu_replay_record_t), KM_SLEEP);
1356
1357 drr->drr_type = DRR_BEGIN;
1358 drr->drr_u.drr_begin = *drc->drc_drrb;
1359 if (ra.byteswap) {
1360 fletcher_4_incremental_byteswap(drr,
1361 sizeof (dmu_replay_record_t), &ra.cksum);
1362 } else {
1363 fletcher_4_incremental_native(drr,
1364 sizeof (dmu_replay_record_t), &ra.cksum);
1365 }
1366 kmem_free(drr, sizeof (dmu_replay_record_t));
1367 }
1368
1369 if (ra.byteswap) {
1370 struct drr_begin *drrb = drc->drc_drrb;
1371 drrb->drr_magic = BSWAP_64(drrb->drr_magic);
1372 drrb->drr_versioninfo = BSWAP_64(drrb->drr_versioninfo);
1373 drrb->drr_creation_time = BSWAP_64(drrb->drr_creation_time);
1374 drrb->drr_type = BSWAP_32(drrb->drr_type);
1375 drrb->drr_toguid = BSWAP_64(drrb->drr_toguid);
1376 drrb->drr_fromguid = BSWAP_64(drrb->drr_fromguid);
1377 }
1378
1379 ra.vp = vp;
1380 ra.voff = *voffp;
1381 ra.bufsize = 1<<20;
1382 ra.buf = kmem_alloc(ra.bufsize, KM_SLEEP);
1383
1384 /* these were verified in dmu_recv_begin */
1385 ASSERT(DMU_GET_STREAM_HDRTYPE(drc->drc_drrb->drr_versioninfo) ==
1386 DMU_SUBSTREAM);
1387 ASSERT(drc->drc_drrb->drr_type < DMU_OST_NUMTYPES);
1388
1389 /*
1390 * Open the objset we are modifying.
1391 */
1392 VERIFY(dmu_objset_from_ds(drc->drc_real_ds, &os) == 0);
1393
1394 ASSERT(drc->drc_real_ds->ds_phys->ds_flags & DS_FLAG_INCONSISTENT);
1395
1396 featureflags = DMU_GET_FEATUREFLAGS(drc->drc_drrb->drr_versioninfo);
1397
1398 /* if this stream is dedup'ed, set up the avl tree for guid mapping */
1399 if (featureflags & DMU_BACKUP_FEATURE_DEDUP) {
1400 minor_t minor;
1401
1402 if (cleanup_fd == -1) {
1403 ra.err = EBADF;
1404 goto out;
1405 }
1406 ra.err = zfs_onexit_fd_hold(cleanup_fd, &minor);
1407 if (ra.err) {
1408 cleanup_fd = -1;
1409 goto out;
1410 }
1411
1412 if (*action_handlep == 0) {
1413 ra.guid_to_ds_map =
1414 kmem_alloc(sizeof (avl_tree_t), KM_SLEEP);
1415 avl_create(ra.guid_to_ds_map, guid_compare,
1416 sizeof (guid_map_entry_t),
1417 offsetof(guid_map_entry_t, avlnode));
1418 ra.err = zfs_onexit_add_cb(minor,
1419 free_guid_map_onexit, ra.guid_to_ds_map,
1420 action_handlep);
1421 if (ra.err)
1422 goto out;
1423 } else {
1424 ra.err = zfs_onexit_cb_data(minor, *action_handlep,
1425 (void **)&ra.guid_to_ds_map);
1426 if (ra.err)
1427 goto out;
1428 }
1429
1430 drc->drc_guid_to_ds_map = ra.guid_to_ds_map;
1431 }
1432
1433 /*
1434 * Read records and process them.
1435 */
1436 pcksum = ra.cksum;
1437 while (ra.err == 0 &&
1438 NULL != (drr = restore_read(&ra, sizeof (*drr)))) {
1439 if (issig(JUSTLOOKING) && issig(FORREAL)) {
1440 ra.err = EINTR;
1441 goto out;
1442 }
1443
1444 if (ra.byteswap)
1445 backup_byteswap(drr);
1446
1447 switch (drr->drr_type) {
1448 case DRR_OBJECT:
1449 {
1450 /*
1451 * We need to make a copy of the record header,
1452 * because restore_{object,write} may need to
1453 * restore_read(), which will invalidate drr.
1454 */
1455 struct drr_object drro = drr->drr_u.drr_object;
1456 ra.err = restore_object(&ra, os, &drro);
1457 break;
1458 }
1459 case DRR_FREEOBJECTS:
1460 {
1461 struct drr_freeobjects drrfo =
1462 drr->drr_u.drr_freeobjects;
1463 ra.err = restore_freeobjects(&ra, os, &drrfo);
1464 break;
1465 }
1466 case DRR_WRITE:
1467 {
1468 struct drr_write drrw = drr->drr_u.drr_write;
1469 ra.err = restore_write(&ra, os, &drrw);
1470 break;
1471 }
1472 case DRR_WRITE_BYREF:
1473 {
1474 struct drr_write_byref drrwbr =
1475 drr->drr_u.drr_write_byref;
1476 ra.err = restore_write_byref(&ra, os, &drrwbr);
1477 break;
1478 }
1479 case DRR_FREE:
1480 {
1481 struct drr_free drrf = drr->drr_u.drr_free;
1482 ra.err = restore_free(&ra, os, &drrf);
1483 break;
1484 }
1485 case DRR_END:
1486 {
1487 struct drr_end drre = drr->drr_u.drr_end;
1488 /*
1489 * We compare against the *previous* checksum
1490 * value, because the stored checksum is of
1491 * everything before the DRR_END record.
1492 */
1493 if (!ZIO_CHECKSUM_EQUAL(drre.drr_checksum, pcksum))
1494 ra.err = ECKSUM;
1495 goto out;
1496 }
1497 case DRR_SPILL:
1498 {
1499 struct drr_spill drrs = drr->drr_u.drr_spill;
1500 ra.err = restore_spill(&ra, os, &drrs);
1501 break;
1502 }
1503 default:
1504 ra.err = EINVAL;
1505 goto out;
1506 }
1507 pcksum = ra.cksum;
1508 }
1509 ASSERT(ra.err != 0);
1510
1511 out:
1512 if ((featureflags & DMU_BACKUP_FEATURE_DEDUP) && (cleanup_fd != -1))
1513 zfs_onexit_fd_rele(cleanup_fd);
1514
1515 if (ra.err != 0) {
1516 /*
1517 * destroy what we created, so we don't leave it in the
1518 * inconsistent restoring state.
1519 */
1520 txg_wait_synced(drc->drc_real_ds->ds_dir->dd_pool, 0);
1521
1522 (void) dsl_dataset_destroy(drc->drc_real_ds, dmu_recv_tag,
1523 B_FALSE);
1524 if (drc->drc_real_ds != drc->drc_logical_ds) {
1525 mutex_exit(&drc->drc_logical_ds->ds_recvlock);
1526 dsl_dataset_rele(drc->drc_logical_ds, dmu_recv_tag);
1527 }
1528 }
1529
1530 kmem_free(ra.buf, ra.bufsize);
1531 *voffp = ra.voff;
1532 return (ra.err);
1533 }
1534
1535 struct recvendsyncarg {
1536 char *tosnap;
1537 uint64_t creation_time;
1538 uint64_t toguid;
1539 };
1540
1541 static int
1542 recv_end_check(void *arg1, void *arg2, dmu_tx_t *tx)
1543 {
1544 dsl_dataset_t *ds = arg1;
1545 struct recvendsyncarg *resa = arg2;
1546
1547 return (dsl_dataset_snapshot_check(ds, resa->tosnap, tx));
1548 }
1549
1550 static void
1551 recv_end_sync(void *arg1, void *arg2, dmu_tx_t *tx)
1552 {
1553 dsl_dataset_t *ds = arg1;
1554 struct recvendsyncarg *resa = arg2;
1555
1556 dsl_dataset_snapshot_sync(ds, resa->tosnap, tx);
1557
1558 /* set snapshot's creation time and guid */
1559 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx);
1560 ds->ds_prev->ds_phys->ds_creation_time = resa->creation_time;
1561 ds->ds_prev->ds_phys->ds_guid = resa->toguid;
1562 ds->ds_prev->ds_phys->ds_flags &= ~DS_FLAG_INCONSISTENT;
1563
1564 dmu_buf_will_dirty(ds->ds_dbuf, tx);
1565 ds->ds_phys->ds_flags &= ~DS_FLAG_INCONSISTENT;
1566 }
1567
1568 static int
1569 add_ds_to_guidmap(avl_tree_t *guid_map, dsl_dataset_t *ds)
1570 {
1571 dsl_pool_t *dp = ds->ds_dir->dd_pool;
1572 uint64_t snapobj = ds->ds_phys->ds_prev_snap_obj;
1573 dsl_dataset_t *snapds;
1574 guid_map_entry_t *gmep;
1575 int err;
1576
1577 ASSERT(guid_map != NULL);
1578
1579 rw_enter(&dp->dp_config_rwlock, RW_READER);
1580 err = dsl_dataset_hold_obj(dp, snapobj, guid_map, &snapds);
1581 if (err == 0) {
1582 gmep = kmem_alloc(sizeof (guid_map_entry_t), KM_SLEEP);
1583 gmep->guid = snapds->ds_phys->ds_guid;
1584 gmep->gme_ds = snapds;
1585 avl_add(guid_map, gmep);
1586 }
1587
1588 rw_exit(&dp->dp_config_rwlock);
1589 return (err);
1590 }
1591
1592 static int
1593 dmu_recv_existing_end(dmu_recv_cookie_t *drc)
1594 {
1595 struct recvendsyncarg resa;
1596 dsl_dataset_t *ds = drc->drc_logical_ds;
1597 int err, myerr;
1598
1599 /*
1600 * XXX hack; seems the ds is still dirty and dsl_pool_zil_clean()
1601 * expects it to have a ds_user_ptr (and zil), but clone_swap()
1602 * can close it.
1603 */
1604 txg_wait_synced(ds->ds_dir->dd_pool, 0);
1605
1606 if (dsl_dataset_tryown(ds, FALSE, dmu_recv_tag)) {
1607 err = dsl_dataset_clone_swap(drc->drc_real_ds, ds,
1608 drc->drc_force);
1609 if (err)
1610 goto out;
1611 } else {
1612 mutex_exit(&ds->ds_recvlock);
1613 dsl_dataset_rele(ds, dmu_recv_tag);
1614 (void) dsl_dataset_destroy(drc->drc_real_ds, dmu_recv_tag,
1615 B_FALSE);
1616 return (EBUSY);
1617 }
1618
1619 resa.creation_time = drc->drc_drrb->drr_creation_time;
1620 resa.toguid = drc->drc_drrb->drr_toguid;
1621 resa.tosnap = drc->drc_tosnap;
1622
1623 err = dsl_sync_task_do(ds->ds_dir->dd_pool,
1624 recv_end_check, recv_end_sync, ds, &resa, 3);
1625 if (err) {
1626 /* swap back */
1627 (void) dsl_dataset_clone_swap(drc->drc_real_ds, ds, B_TRUE);
1628 }
1629
1630 out:
1631 mutex_exit(&ds->ds_recvlock);
1632 if (err == 0 && drc->drc_guid_to_ds_map != NULL)
1633 (void) add_ds_to_guidmap(drc->drc_guid_to_ds_map, ds);
1634 dsl_dataset_disown(ds, dmu_recv_tag);
1635 myerr = dsl_dataset_destroy(drc->drc_real_ds, dmu_recv_tag, B_FALSE);
1636 ASSERT3U(myerr, ==, 0);
1637 return (err);
1638 }
1639
1640 static int
1641 dmu_recv_new_end(dmu_recv_cookie_t *drc)
1642 {
1643 struct recvendsyncarg resa;
1644 dsl_dataset_t *ds = drc->drc_logical_ds;
1645 int err;
1646
1647 /*
1648 * XXX hack; seems the ds is still dirty and dsl_pool_zil_clean()
1649 * expects it to have a ds_user_ptr (and zil), but clone_swap()
1650 * can close it.
1651 */
1652 txg_wait_synced(ds->ds_dir->dd_pool, 0);
1653
1654 resa.creation_time = drc->drc_drrb->drr_creation_time;
1655 resa.toguid = drc->drc_drrb->drr_toguid;
1656 resa.tosnap = drc->drc_tosnap;
1657
1658 err = dsl_sync_task_do(ds->ds_dir->dd_pool,
1659 recv_end_check, recv_end_sync, ds, &resa, 3);
1660 if (err) {
1661 /* clean up the fs we just recv'd into */
1662 (void) dsl_dataset_destroy(ds, dmu_recv_tag, B_FALSE);
1663 } else {
1664 if (drc->drc_guid_to_ds_map != NULL)
1665 (void) add_ds_to_guidmap(drc->drc_guid_to_ds_map, ds);
1666 /* release the hold from dmu_recv_begin */
1667 dsl_dataset_disown(ds, dmu_recv_tag);
1668 }
1669 return (err);
1670 }
1671
1672 int
1673 dmu_recv_end(dmu_recv_cookie_t *drc)
1674 {
1675 if (drc->drc_logical_ds != drc->drc_real_ds)
1676 return (dmu_recv_existing_end(drc));
1677 else
1678 return (dmu_recv_new_end(drc));
1679 }
Unleashed OS