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.
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.
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]
22 * Copyright 2007 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
26 #pragma ident "%Z%%M% %I% %E% SMI"
29 #include <sys/dmu_impl.h>
30 #include <sys/dmu_tx.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_pool.h>
39 #include <sys/dsl_synctask.h>
40 #include <sys/zfs_ioctl.h>
42 #include <sys/zio_checksum.h>
45 dmu_replay_record_t *drr;
54 dump_bytes(struct backuparg *ba, void *buf, int len)
59 ASSERT3U(len % 8, ==, 0);
61 fletcher_4_incremental_native(buf, len, &ba->zc);
68 auio.uio_segflg = UIO_SYSSPACE;
69 auio.uio_rw = UIO_WRITE;
70 auio.uio_offset = (off_t)-1;
73 if (ba->fp->f_type == DTYPE_VNODE)
75 ba->err = fo_write(ba->fp, &auio, ba->td->td_ucred, 0, ba->td);
77 fprintf(stderr, "%s: returning EOPNOTSUPP\n", __func__);
85 dump_free(struct backuparg *ba, uint64_t object, uint64_t offset,
88 /* write a FREE record */
89 bzero(ba->drr, sizeof (dmu_replay_record_t));
90 ba->drr->drr_type = DRR_FREE;
91 ba->drr->drr_u.drr_free.drr_object = object;
92 ba->drr->drr_u.drr_free.drr_offset = offset;
93 ba->drr->drr_u.drr_free.drr_length = length;
95 if (dump_bytes(ba, ba->drr, sizeof (dmu_replay_record_t)))
101 dump_data(struct backuparg *ba, dmu_object_type_t type,
102 uint64_t object, uint64_t offset, int blksz, void *data)
104 /* write a DATA record */
105 bzero(ba->drr, sizeof (dmu_replay_record_t));
106 ba->drr->drr_type = DRR_WRITE;
107 ba->drr->drr_u.drr_write.drr_object = object;
108 ba->drr->drr_u.drr_write.drr_type = type;
109 ba->drr->drr_u.drr_write.drr_offset = offset;
110 ba->drr->drr_u.drr_write.drr_length = blksz;
112 if (dump_bytes(ba, ba->drr, sizeof (dmu_replay_record_t)))
114 if (dump_bytes(ba, data, blksz))
120 dump_freeobjects(struct backuparg *ba, uint64_t firstobj, uint64_t numobjs)
122 /* write a FREEOBJECTS record */
123 bzero(ba->drr, sizeof (dmu_replay_record_t));
124 ba->drr->drr_type = DRR_FREEOBJECTS;
125 ba->drr->drr_u.drr_freeobjects.drr_firstobj = firstobj;
126 ba->drr->drr_u.drr_freeobjects.drr_numobjs = numobjs;
128 if (dump_bytes(ba, ba->drr, sizeof (dmu_replay_record_t)))
134 dump_dnode(struct backuparg *ba, uint64_t object, dnode_phys_t *dnp)
136 if (dnp == NULL || dnp->dn_type == DMU_OT_NONE)
137 return (dump_freeobjects(ba, object, 1));
139 /* write an OBJECT record */
140 bzero(ba->drr, sizeof (dmu_replay_record_t));
141 ba->drr->drr_type = DRR_OBJECT;
142 ba->drr->drr_u.drr_object.drr_object = object;
143 ba->drr->drr_u.drr_object.drr_type = dnp->dn_type;
144 ba->drr->drr_u.drr_object.drr_bonustype = dnp->dn_bonustype;
145 ba->drr->drr_u.drr_object.drr_blksz =
146 dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT;
147 ba->drr->drr_u.drr_object.drr_bonuslen = dnp->dn_bonuslen;
148 ba->drr->drr_u.drr_object.drr_checksum = dnp->dn_checksum;
149 ba->drr->drr_u.drr_object.drr_compress = dnp->dn_compress;
151 if (dump_bytes(ba, ba->drr, sizeof (dmu_replay_record_t)))
154 if (dump_bytes(ba, DN_BONUS(dnp), P2ROUNDUP(dnp->dn_bonuslen, 8)))
157 /* free anything past the end of the file */
158 if (dump_free(ba, object, (dnp->dn_maxblkid + 1) *
159 (dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT), -1ULL))
166 #define BP_SPAN(dnp, level) \
167 (((uint64_t)dnp->dn_datablkszsec) << (SPA_MINBLOCKSHIFT + \
168 (level) * (dnp->dn_indblkshift - SPA_BLKPTRSHIFT)))
171 backup_cb(traverse_blk_cache_t *bc, spa_t *spa, void *arg)
173 struct backuparg *ba = arg;
174 uint64_t object = bc->bc_bookmark.zb_object;
175 int level = bc->bc_bookmark.zb_level;
176 uint64_t blkid = bc->bc_bookmark.zb_blkid;
177 blkptr_t *bp = bc->bc_blkptr.blk_birth ? &bc->bc_blkptr : NULL;
178 dmu_object_type_t type = bp ? BP_GET_TYPE(bp) : DMU_OT_NONE;
179 void *data = bc->bc_data;
182 if (SIGPENDING(curthread))
185 ASSERT(data || bp == NULL);
187 if (bp == NULL && object == 0) {
188 uint64_t span = BP_SPAN(bc->bc_dnode, level);
189 uint64_t dnobj = (blkid * span) >> DNODE_SHIFT;
190 err = dump_freeobjects(ba, dnobj, span >> DNODE_SHIFT);
191 } else if (bp == NULL) {
192 uint64_t span = BP_SPAN(bc->bc_dnode, level);
193 err = dump_free(ba, object, blkid * span, span);
194 } else if (data && level == 0 && type == DMU_OT_DNODE) {
195 dnode_phys_t *blk = data;
197 int blksz = BP_GET_LSIZE(bp);
199 for (i = 0; i < blksz >> DNODE_SHIFT; i++) {
201 (blkid << (DNODE_BLOCK_SHIFT - DNODE_SHIFT)) + i;
202 err = dump_dnode(ba, dnobj, blk+i);
206 } else if (level == 0 &&
207 type != DMU_OT_DNODE && type != DMU_OT_OBJSET) {
208 int blksz = BP_GET_LSIZE(bp);
210 uint32_t aflags = ARC_WAIT;
214 zb.zb_objset = ba->os->os->os_dsl_dataset->ds_object;
215 zb.zb_object = object;
218 (void) arc_read(NULL, spa, bp,
219 dmu_ot[type].ot_byteswap, arc_getbuf_func, &abuf,
220 ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_MUSTSUCCEED,
224 err = dump_data(ba, type, object, blkid * blksz,
225 blksz, abuf->b_data);
226 (void) arc_buf_remove_ref(abuf, &abuf);
229 err = dump_data(ba, type, object, blkid * blksz,
234 ASSERT(err == 0 || err == EINTR);
239 dmu_sendbackup(objset_t *tosnap, objset_t *fromsnap, struct file *fp)
241 dsl_dataset_t *ds = tosnap->os->os_dsl_dataset;
242 dsl_dataset_t *fromds = fromsnap ? fromsnap->os->os_dsl_dataset : NULL;
243 dmu_replay_record_t *drr;
247 /* tosnap must be a snapshot */
248 if (ds->ds_phys->ds_next_snap_obj == 0)
251 /* fromsnap must be an earlier snapshot from the same fs as tosnap */
252 if (fromds && (ds->ds_dir != fromds->ds_dir ||
253 fromds->ds_phys->ds_creation_txg >=
254 ds->ds_phys->ds_creation_txg))
257 drr = kmem_zalloc(sizeof (dmu_replay_record_t), KM_SLEEP);
258 drr->drr_type = DRR_BEGIN;
259 drr->drr_u.drr_begin.drr_magic = DMU_BACKUP_MAGIC;
260 drr->drr_u.drr_begin.drr_version = DMU_BACKUP_VERSION;
261 drr->drr_u.drr_begin.drr_creation_time =
262 ds->ds_phys->ds_creation_time;
263 drr->drr_u.drr_begin.drr_type = tosnap->os->os_phys->os_type;
264 drr->drr_u.drr_begin.drr_toguid = ds->ds_phys->ds_guid;
266 drr->drr_u.drr_begin.drr_fromguid = fromds->ds_phys->ds_guid;
267 dsl_dataset_name(ds, drr->drr_u.drr_begin.drr_toname);
273 ZIO_SET_CHECKSUM(&ba.zc, 0, 0, 0, 0);
275 if (dump_bytes(&ba, drr, sizeof (dmu_replay_record_t))) {
276 kmem_free(drr, sizeof (dmu_replay_record_t));
280 err = traverse_dsl_dataset(ds,
281 fromds ? fromds->ds_phys->ds_creation_txg : 0,
282 ADVANCE_PRE | ADVANCE_HOLES | ADVANCE_DATA | ADVANCE_NOLOCK,
286 if (err == EINTR && ba.err)
288 kmem_free(drr, sizeof (dmu_replay_record_t));
292 bzero(drr, sizeof (dmu_replay_record_t));
293 drr->drr_type = DRR_END;
294 drr->drr_u.drr_end.drr_checksum = ba.zc;
296 if (dump_bytes(&ba, drr, sizeof (dmu_replay_record_t))) {
297 kmem_free(drr, sizeof (dmu_replay_record_t));
301 kmem_free(drr, sizeof (dmu_replay_record_t));
313 int buflen; /* number of valid bytes in buf */
314 int bufoff; /* next offset to read */
315 int bufsize; /* amount of memory allocated for buf */
321 replay_incremental_check(void *arg1, void *arg2, dmu_tx_t *tx)
323 dsl_dataset_t *ds = arg1;
324 struct drr_begin *drrb = arg2;
325 const char *snapname;
329 /* must already be a snapshot of this fs */
330 if (ds->ds_phys->ds_prev_snap_obj == 0)
333 /* most recent snapshot must match fromguid */
334 if (ds->ds_prev->ds_phys->ds_guid != drrb->drr_fromguid)
336 /* must not have any changes since most recent snapshot */
337 if (ds->ds_phys->ds_bp.blk_birth >
338 ds->ds_prev->ds_phys->ds_creation_txg)
341 /* new snapshot name must not exist */
342 snapname = strrchr(drrb->drr_toname, '@');
343 if (snapname == NULL)
347 err = zap_lookup(ds->ds_dir->dd_pool->dp_meta_objset,
348 ds->ds_phys->ds_snapnames_zapobj, snapname, 8, 1, &val);
359 replay_incremental_sync(void *arg1, void *arg2, dmu_tx_t *tx)
361 dsl_dataset_t *ds = arg1;
362 dmu_buf_will_dirty(ds->ds_dbuf, tx);
363 ds->ds_phys->ds_flags |= DS_FLAG_INCONSISTENT;
368 replay_full_check(void *arg1, void *arg2, dmu_tx_t *tx)
370 dsl_dir_t *dd = arg1;
371 struct drr_begin *drrb = arg2;
372 objset_t *mos = dd->dd_pool->dp_meta_objset;
377 cp = strchr(drrb->drr_toname, '@');
379 err = zap_lookup(mos, dd->dd_phys->dd_child_dir_zapobj,
380 strrchr(drrb->drr_toname, '/') + 1,
381 sizeof (uint64_t), 1, &val);
385 return (err ? err : EEXIST);
391 replay_full_sync(void *arg1, void *arg2, dmu_tx_t *tx)
393 dsl_dir_t *dd = arg1;
394 struct drr_begin *drrb = arg2;
399 cp = strchr(drrb->drr_toname, '@');
401 dsobj = dsl_dataset_create_sync(dd, strrchr(drrb->drr_toname, '/') + 1,
405 VERIFY(0 == dsl_dataset_open_obj(dd->dd_pool, dsobj, NULL,
406 DS_MODE_EXCLUSIVE, FTAG, &ds));
408 (void) dmu_objset_create_impl(dsl_dataset_get_spa(ds),
409 ds, &ds->ds_phys->ds_bp, drrb->drr_type, tx);
411 dmu_buf_will_dirty(ds->ds_dbuf, tx);
412 ds->ds_phys->ds_flags |= DS_FLAG_INCONSISTENT;
414 dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, FTAG);
418 replay_end_check(void *arg1, void *arg2, dmu_tx_t *tx)
421 struct drr_begin *drrb = arg2;
424 /* XXX verify that drr_toname is in dd */
426 snapname = strchr(drrb->drr_toname, '@');
427 if (snapname == NULL)
431 return (dsl_dataset_snapshot_check(os, snapname, tx));
435 replay_end_sync(void *arg1, void *arg2, dmu_tx_t *tx)
438 struct drr_begin *drrb = arg2;
440 dsl_dataset_t *ds, *hds;
442 snapname = strchr(drrb->drr_toname, '@') + 1;
444 dsl_dataset_snapshot_sync(os, snapname, tx);
446 /* set snapshot's creation time and guid */
447 hds = os->os->os_dsl_dataset;
448 VERIFY(0 == dsl_dataset_open_obj(hds->ds_dir->dd_pool,
449 hds->ds_phys->ds_prev_snap_obj, NULL,
450 DS_MODE_PRIMARY | DS_MODE_READONLY | DS_MODE_INCONSISTENT,
453 dmu_buf_will_dirty(ds->ds_dbuf, tx);
454 ds->ds_phys->ds_creation_time = drrb->drr_creation_time;
455 ds->ds_phys->ds_guid = drrb->drr_toguid;
456 ds->ds_phys->ds_flags &= ~DS_FLAG_INCONSISTENT;
458 dsl_dataset_close(ds, DS_MODE_PRIMARY, FTAG);
460 dmu_buf_will_dirty(hds->ds_dbuf, tx);
461 hds->ds_phys->ds_flags &= ~DS_FLAG_INCONSISTENT;
465 restore_bytes(struct restorearg *ra, void *buf, int len, off_t off, int *resid)
473 auio.uio_iov = &aiov;
475 auio.uio_resid = len;
476 auio.uio_segflg = UIO_SYSSPACE;
477 auio.uio_rw = UIO_READ;
478 auio.uio_offset = off;
479 auio.uio_td = ra->td;
481 error = fo_read(ra->fp, &auio, ra->td->td_ucred, FOF_OFFSET, ra->td);
483 fprintf(stderr, "%s: returning EOPNOTSUPP\n", __func__);
486 *resid = auio.uio_resid;
491 restore_read(struct restorearg *ra, int len)
495 /* some things will require 8-byte alignment, so everything must */
496 ASSERT3U(len % 8, ==, 0);
498 while (ra->buflen - ra->bufoff < len) {
500 int leftover = ra->buflen - ra->bufoff;
502 (void) memmove(ra->buf, ra->buf + ra->bufoff, leftover);
504 ra->err = restore_bytes(ra, (caddr_t)ra->buf + leftover,
505 ra->bufsize - leftover, ra->voff, &resid);
507 ra->voff += ra->bufsize - leftover - resid;
508 ra->buflen = ra->bufsize - resid;
510 if (resid == ra->bufsize - leftover)
514 /* Could compute checksum here? */
517 ASSERT3U(ra->bufoff % 8, ==, 0);
518 ASSERT3U(ra->buflen - ra->bufoff, >=, len);
519 rv = ra->buf + ra->bufoff;
522 fletcher_4_incremental_byteswap(rv, len, &ra->zc);
524 fletcher_4_incremental_native(rv, len, &ra->zc);
529 backup_byteswap(dmu_replay_record_t *drr)
531 #define DO64(X) (drr->drr_u.X = BSWAP_64(drr->drr_u.X))
532 #define DO32(X) (drr->drr_u.X = BSWAP_32(drr->drr_u.X))
533 drr->drr_type = BSWAP_32(drr->drr_type);
534 switch (drr->drr_type) {
536 DO64(drr_begin.drr_magic);
537 DO64(drr_begin.drr_version);
538 DO64(drr_begin.drr_creation_time);
539 DO32(drr_begin.drr_type);
540 DO64(drr_begin.drr_toguid);
541 DO64(drr_begin.drr_fromguid);
544 DO64(drr_object.drr_object);
545 /* DO64(drr_object.drr_allocation_txg); */
546 DO32(drr_object.drr_type);
547 DO32(drr_object.drr_bonustype);
548 DO32(drr_object.drr_blksz);
549 DO32(drr_object.drr_bonuslen);
551 case DRR_FREEOBJECTS:
552 DO64(drr_freeobjects.drr_firstobj);
553 DO64(drr_freeobjects.drr_numobjs);
556 DO64(drr_write.drr_object);
557 DO32(drr_write.drr_type);
558 DO64(drr_write.drr_offset);
559 DO64(drr_write.drr_length);
562 DO64(drr_free.drr_object);
563 DO64(drr_free.drr_offset);
564 DO64(drr_free.drr_length);
567 DO64(drr_end.drr_checksum.zc_word[0]);
568 DO64(drr_end.drr_checksum.zc_word[1]);
569 DO64(drr_end.drr_checksum.zc_word[2]);
570 DO64(drr_end.drr_checksum.zc_word[3]);
578 restore_object(struct restorearg *ra, objset_t *os, struct drr_object *drro)
583 err = dmu_object_info(os, drro->drr_object, NULL);
585 if (err != 0 && err != ENOENT)
588 if (drro->drr_type == DMU_OT_NONE ||
589 drro->drr_type >= DMU_OT_NUMTYPES ||
590 drro->drr_bonustype >= DMU_OT_NUMTYPES ||
591 drro->drr_checksum >= ZIO_CHECKSUM_FUNCTIONS ||
592 drro->drr_compress >= ZIO_COMPRESS_FUNCTIONS ||
593 P2PHASE(drro->drr_blksz, SPA_MINBLOCKSIZE) ||
594 drro->drr_blksz < SPA_MINBLOCKSIZE ||
595 drro->drr_blksz > SPA_MAXBLOCKSIZE ||
596 drro->drr_bonuslen > DN_MAX_BONUSLEN) {
600 tx = dmu_tx_create(os);
603 /* currently free, want to be allocated */
604 dmu_tx_hold_bonus(tx, DMU_NEW_OBJECT);
605 dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0, 1);
606 err = dmu_tx_assign(tx, TXG_WAIT);
611 err = dmu_object_claim(os, drro->drr_object,
612 drro->drr_type, drro->drr_blksz,
613 drro->drr_bonustype, drro->drr_bonuslen, tx);
615 /* currently allocated, want to be allocated */
616 dmu_tx_hold_bonus(tx, drro->drr_object);
618 * We may change blocksize, so need to
621 dmu_tx_hold_write(tx, drro->drr_object, 0, 1);
622 err = dmu_tx_assign(tx, TXG_WAIT);
628 err = dmu_object_reclaim(os, drro->drr_object,
629 drro->drr_type, drro->drr_blksz,
630 drro->drr_bonustype, drro->drr_bonuslen, tx);
637 dmu_object_set_checksum(os, drro->drr_object, drro->drr_checksum, tx);
638 dmu_object_set_compress(os, drro->drr_object, drro->drr_compress, tx);
640 if (drro->drr_bonuslen) {
643 VERIFY(0 == dmu_bonus_hold(os, drro->drr_object, FTAG, &db));
644 dmu_buf_will_dirty(db, tx);
646 ASSERT3U(db->db_size, ==, drro->drr_bonuslen);
647 data = restore_read(ra, P2ROUNDUP(db->db_size, 8));
652 bcopy(data, db->db_data, db->db_size);
654 dmu_ot[drro->drr_bonustype].ot_byteswap(db->db_data,
657 dmu_buf_rele(db, FTAG);
665 restore_freeobjects(struct restorearg *ra, objset_t *os,
666 struct drr_freeobjects *drrfo)
670 if (drrfo->drr_firstobj + drrfo->drr_numobjs < drrfo->drr_firstobj)
673 for (obj = drrfo->drr_firstobj;
674 obj < drrfo->drr_firstobj + drrfo->drr_numobjs;
675 (void) dmu_object_next(os, &obj, FALSE, 0)) {
679 if (dmu_object_info(os, obj, NULL) != 0)
682 tx = dmu_tx_create(os);
683 dmu_tx_hold_bonus(tx, obj);
684 err = dmu_tx_assign(tx, TXG_WAIT);
689 err = dmu_object_free(os, obj, tx);
691 if (err && err != ENOENT)
698 restore_write(struct restorearg *ra, objset_t *os,
699 struct drr_write *drrw)
705 if (drrw->drr_offset + drrw->drr_length < drrw->drr_offset ||
706 drrw->drr_type >= DMU_OT_NUMTYPES)
709 data = restore_read(ra, drrw->drr_length);
713 if (dmu_object_info(os, drrw->drr_object, NULL) != 0)
716 tx = dmu_tx_create(os);
718 dmu_tx_hold_write(tx, drrw->drr_object,
719 drrw->drr_offset, drrw->drr_length);
720 err = dmu_tx_assign(tx, TXG_WAIT);
726 dmu_ot[drrw->drr_type].ot_byteswap(data, drrw->drr_length);
727 dmu_write(os, drrw->drr_object,
728 drrw->drr_offset, drrw->drr_length, data, tx);
735 restore_free(struct restorearg *ra, objset_t *os,
736 struct drr_free *drrf)
741 if (drrf->drr_length != -1ULL &&
742 drrf->drr_offset + drrf->drr_length < drrf->drr_offset)
745 if (dmu_object_info(os, drrf->drr_object, NULL) != 0)
748 tx = dmu_tx_create(os);
750 dmu_tx_hold_free(tx, drrf->drr_object,
751 drrf->drr_offset, drrf->drr_length);
752 err = dmu_tx_assign(tx, TXG_WAIT);
757 err = dmu_free_range(os, drrf->drr_object,
758 drrf->drr_offset, drrf->drr_length, tx);
764 dmu_recvbackup(char *tosnap, struct drr_begin *drrb, uint64_t *sizep,
765 boolean_t force, struct file *fp, uint64_t voffset)
767 kthread_t *td = curthread;
768 struct restorearg ra;
769 dmu_replay_record_t *drr;
774 bzero(&ra, sizeof (ra));
779 ra.buf = kmem_alloc(ra.bufsize, KM_SLEEP);
781 if (drrb->drr_magic == DMU_BACKUP_MAGIC) {
783 } else if (drrb->drr_magic == BSWAP_64(DMU_BACKUP_MAGIC)) {
791 * NB: this assumes that struct drr_begin will be the largest in
792 * dmu_replay_record_t's drr_u, and thus we don't need to pad it
793 * with zeros to make it the same length as we wrote out.
795 ((dmu_replay_record_t *)ra.buf)->drr_type = DRR_BEGIN;
796 ((dmu_replay_record_t *)ra.buf)->drr_pad = 0;
797 ((dmu_replay_record_t *)ra.buf)->drr_u.drr_begin = *drrb;
799 fletcher_4_incremental_byteswap(ra.buf,
800 sizeof (dmu_replay_record_t), &ra.zc);
802 fletcher_4_incremental_native(ra.buf,
803 sizeof (dmu_replay_record_t), &ra.zc);
805 (void) strcpy(drrb->drr_toname, tosnap); /* for the sync funcs */
808 drrb->drr_magic = BSWAP_64(drrb->drr_magic);
809 drrb->drr_version = BSWAP_64(drrb->drr_version);
810 drrb->drr_creation_time = BSWAP_64(drrb->drr_creation_time);
811 drrb->drr_type = BSWAP_32(drrb->drr_type);
812 drrb->drr_toguid = BSWAP_64(drrb->drr_toguid);
813 drrb->drr_fromguid = BSWAP_64(drrb->drr_fromguid);
816 ASSERT3U(drrb->drr_magic, ==, DMU_BACKUP_MAGIC);
818 if (drrb->drr_version != DMU_BACKUP_VERSION ||
819 drrb->drr_type >= DMU_OST_NUMTYPES ||
820 strchr(drrb->drr_toname, '@') == NULL) {
826 * Process the begin in syncing context.
828 if (drrb->drr_fromguid) {
829 /* incremental backup */
830 dsl_dataset_t *ds = NULL;
832 cp = strchr(tosnap, '@');
834 ra.err = dsl_dataset_open(tosnap, DS_MODE_EXCLUSIVE, FTAG, &ds);
840 * Only do the rollback if the most recent snapshot
841 * matches the incremental source
844 if (ds->ds_prev == NULL ||
845 ds->ds_prev->ds_phys->ds_guid !=
846 drrb->drr_fromguid) {
847 dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, FTAG);
848 kmem_free(ra.buf, ra.bufsize);
851 (void) dsl_dataset_rollback(ds);
853 ra.err = dsl_sync_task_do(ds->ds_dir->dd_pool,
854 replay_incremental_check, replay_incremental_sync,
856 dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, FTAG);
859 dsl_dir_t *dd = NULL;
862 /* can't restore full backup into topmost fs, for now */
863 if (strrchr(drrb->drr_toname, '/') == NULL) {
868 cp = strchr(tosnap, '@');
870 ra.err = dsl_dir_open(tosnap, FTAG, &dd, &tail);
879 ra.err = dsl_sync_task_do(dd->dd_pool, replay_full_check,
880 replay_full_sync, dd, drrb, 5);
881 dsl_dir_close(dd, FTAG);
887 * Open the objset we are modifying.
890 cp = strchr(tosnap, '@');
892 ra.err = dmu_objset_open(tosnap, DMU_OST_ANY,
893 DS_MODE_PRIMARY | DS_MODE_INCONSISTENT, &os);
895 ASSERT3U(ra.err, ==, 0);
898 * Read records and process them.
901 while (ra.err == 0 &&
902 NULL != (drr = restore_read(&ra, sizeof (*drr)))) {
903 if (SIGPENDING(td)) {
909 backup_byteswap(drr);
911 switch (drr->drr_type) {
915 * We need to make a copy of the record header,
916 * because restore_{object,write} may need to
917 * restore_read(), which will invalidate drr.
919 struct drr_object drro = drr->drr_u.drr_object;
920 ra.err = restore_object(&ra, os, &drro);
923 case DRR_FREEOBJECTS:
925 struct drr_freeobjects drrfo =
926 drr->drr_u.drr_freeobjects;
927 ra.err = restore_freeobjects(&ra, os, &drrfo);
932 struct drr_write drrw = drr->drr_u.drr_write;
933 ra.err = restore_write(&ra, os, &drrw);
938 struct drr_free drrf = drr->drr_u.drr_free;
939 ra.err = restore_free(&ra, os, &drrf);
944 struct drr_end drre = drr->drr_u.drr_end;
946 * We compare against the *previous* checksum
947 * value, because the stored checksum is of
948 * everything before the DRR_END record.
950 if (drre.drr_checksum.zc_word[0] != 0 &&
951 !ZIO_CHECKSUM_EQUAL(drre.drr_checksum, pzc)) {
956 ra.err = dsl_sync_task_do(dmu_objset_ds(os)->
957 ds_dir->dd_pool, replay_end_check, replay_end_sync,
970 dmu_objset_close(os);
973 * Make sure we don't rollback/destroy unless we actually
974 * processed the begin properly. 'os' will only be set if this
977 if (ra.err && os && tosnap && strchr(tosnap, '@')) {
979 * rollback or destroy what we created, so we don't
980 * leave it in the restoring state.
985 cp = strchr(tosnap, '@');
987 err = dsl_dataset_open(tosnap,
988 DS_MODE_EXCLUSIVE | DS_MODE_INCONSISTENT,
991 txg_wait_synced(ds->ds_dir->dd_pool, 0);
992 if (drrb->drr_fromguid) {
993 /* incremental: rollback to most recent snap */
994 (void) dsl_dataset_rollback(ds);
995 dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, FTAG);
997 /* full: destroy whole fs */
998 dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, FTAG);
999 (void) dsl_dataset_destroy(tosnap);
1005 kmem_free(ra.buf, ra.bufsize);