module/zfs/dmu_send.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 /*
  22  * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
  23  * Copyright (c) 2011 by Delphix. All rights reserved.
  24  * Copyright 2011 Nexenta Systems, Inc. All rights reserved.
  25  * Copyright (c) 2012, Joyent, Inc. All rights reserved.
  26  * Copyright (c) 2013 by Delphix. All rights reserved.
  27  */
  28
  29 #include <sys/dmu.h>
  30 #include <sys/dmu_impl.h>
  31 #include <sys/dmu_tx.h>
  32 #include <sys/dbuf.h>
  33 #include <sys/dnode.h>
  34 #include <sys/zfs_context.h>
  35 #include <sys/dmu_objset.h>
  36 #include <sys/dmu_traverse.h>
  37 #include <sys/dsl_dataset.h>
  38 #include <sys/dsl_dir.h>
  39 #include <sys/dsl_prop.h>
  40 #include <sys/dsl_pool.h>
  41 #include <sys/dsl_synctask.h>
  42 #include <sys/spa_impl.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 #include <sys/dmu_send.h>
  52 #include <sys/dsl_destroy.h>
  53
  54 /* Set this tunable to TRUE to replace corrupt data with 0x2f5baddb10c */
  55 int zfs_send_corrupt_data = B_FALSE;
  56
  57 static char *dmu_recv_tag = "dmu_recv_tag";
  58 static const char *recv_clone_name = "%recv";
  59
  60 typedef struct dump_bytes_io {
  61         dmu_sendarg_t   *dbi_dsp;
  62         void            *dbi_buf;
  63         int             dbi_len;
  64 } dump_bytes_io_t;
  65
  66 static void
  67 dump_bytes_strategy(void *arg)
  68 {
  69         dump_bytes_io_t *dbi = (dump_bytes_io_t *)arg;
  70         dmu_sendarg_t *dsp = dbi->dbi_dsp;
  71         dsl_dataset_t *ds = dsp->dsa_os->os_dsl_dataset;
  72         ssize_t resid; /* have to get resid to get detailed errno */
  73         ASSERT0(dbi->dbi_len % 8);
  74
  75         fletcher_4_incremental_native(dbi->dbi_buf, dbi->dbi_len, &dsp->dsa_zc);
  76         dsp->dsa_err = vn_rdwr(UIO_WRITE, dsp->dsa_vp,
  77             (caddr_t)dbi->dbi_buf, dbi->dbi_len,
  78             0, UIO_SYSSPACE, FAPPEND, RLIM64_INFINITY, CRED(), &resid);
  79
  80         mutex_enter(&ds->ds_sendstream_lock);
  81         *dsp->dsa_off += dbi->dbi_len;
  82         mutex_exit(&ds->ds_sendstream_lock);
  83 }
  84
  85 static int
  86 dump_bytes(dmu_sendarg_t *dsp, void *buf, int len)
  87 {
  88         dump_bytes_io_t dbi;
  89
  90         dbi.dbi_dsp = dsp;
  91         dbi.dbi_buf = buf;
  92         dbi.dbi_len = len;
  93
  94         /*
  95          * The vn_rdwr() call is performed in a taskq to ensure that there is
  96          * always enough stack space to write safely to the target filesystem.
  97          * The ZIO_TYPE_FREE threads are used because there can be a lot of
  98          * them and they are used in vdev_file.c for a similar purpose.
  99          */
 100         spa_taskq_dispatch_sync(dmu_objset_spa(dsp->dsa_os), ZIO_TYPE_FREE,
 101             ZIO_TASKQ_ISSUE, dump_bytes_strategy, &dbi, TQ_SLEEP);
 102
 103         return (dsp->dsa_err);
 104 }
 105
 106 static int
 107 dump_free(dmu_sendarg_t *dsp, uint64_t object, uint64_t offset,
 108     uint64_t length)
 109 {
 110         struct drr_free *drrf = &(dsp->dsa_drr->drr_u.drr_free);
 111
 112         if (length != -1ULL && offset + length < offset)
 113                 length = -1ULL;
 114
 115         /*
 116          * If there is a pending op, but it's not PENDING_FREE, push it out,
 117          * since free block aggregation can only be done for blocks of the
 118          * same type (i.e., DRR_FREE records can only be aggregated with
 119          * other DRR_FREE records.  DRR_FREEOBJECTS records can only be
 120          * aggregated with other DRR_FREEOBJECTS records.
 121          */
 122         if (dsp->dsa_pending_op != PENDING_NONE &&
 123             dsp->dsa_pending_op != PENDING_FREE) {
 124                 if (dump_bytes(dsp, dsp->dsa_drr,
 125                     sizeof (dmu_replay_record_t)) != 0)
 126                         return (SET_ERROR(EINTR));
 127                 dsp->dsa_pending_op = PENDING_NONE;
 128         }
 129
 130         if (dsp->dsa_pending_op == PENDING_FREE) {
 131                 /*
 132                  * There should never be a PENDING_FREE if length is -1
 133                  * (because dump_dnode is the only place where this
 134                  * function is called with a -1, and only after flushing
 135                  * any pending record).
 136                  */
 137                 ASSERT(length != -1ULL);
 138                 /*
 139                  * Check to see whether this free block can be aggregated
 140                  * with pending one.
 141                  */
 142                 if (drrf->drr_object == object && drrf->drr_offset +
 143                     drrf->drr_length == offset) {
 144                         drrf->drr_length += length;
 145                         return (0);
 146                 } else {
 147                         /* not a continuation.  Push out pending record */
 148                         if (dump_bytes(dsp, dsp->dsa_drr,
 149                             sizeof (dmu_replay_record_t)) != 0)
 150                                 return (SET_ERROR(EINTR));
 151                         dsp->dsa_pending_op = PENDING_NONE;
 152                 }
 153         }
 154         /* create a FREE record and make it pending */
 155         bzero(dsp->dsa_drr, sizeof (dmu_replay_record_t));
 156         dsp->dsa_drr->drr_type = DRR_FREE;
 157         drrf->drr_object = object;
 158         drrf->drr_offset = offset;
 159         drrf->drr_length = length;
 160         drrf->drr_toguid = dsp->dsa_toguid;
 161         if (length == -1ULL) {
 162                 if (dump_bytes(dsp, dsp->dsa_drr,
 163                     sizeof (dmu_replay_record_t)) != 0)
 164                         return (SET_ERROR(EINTR));
 165         } else {
 166                 dsp->dsa_pending_op = PENDING_FREE;
 167         }
 168
 169         return (0);
 170 }
 171
 172 static int
 173 dump_data(dmu_sendarg_t *dsp, dmu_object_type_t type,
 174     uint64_t object, uint64_t offset, int blksz, const blkptr_t *bp, void *data)
 175 {
 176         struct drr_write *drrw = &(dsp->dsa_drr->drr_u.drr_write);
 177
 178
 179         /*
 180          * If there is any kind of pending aggregation (currently either
 181          * a grouping of free objects or free blocks), push it out to
 182          * the stream, since aggregation can't be done across operations
 183          * of different types.
 184          */
 185         if (dsp->dsa_pending_op != PENDING_NONE) {
 186                 if (dump_bytes(dsp, dsp->dsa_drr,
 187                     sizeof (dmu_replay_record_t)) != 0)
 188                         return (SET_ERROR(EINTR));
 189                 dsp->dsa_pending_op = PENDING_NONE;
 190         }
 191         /* write a DATA record */
 192         bzero(dsp->dsa_drr, sizeof (dmu_replay_record_t));
 193         dsp->dsa_drr->drr_type = DRR_WRITE;
 194         drrw->drr_object = object;
 195         drrw->drr_type = type;
 196         drrw->drr_offset = offset;
 197         drrw->drr_length = blksz;
 198         drrw->drr_toguid = dsp->dsa_toguid;
 199         drrw->drr_checksumtype = BP_GET_CHECKSUM(bp);
 200         if (zio_checksum_table[drrw->drr_checksumtype].ci_dedup)
 201                 drrw->drr_checksumflags |= DRR_CHECKSUM_DEDUP;
 202         DDK_SET_LSIZE(&drrw->drr_key, BP_GET_LSIZE(bp));
 203         DDK_SET_PSIZE(&drrw->drr_key, BP_GET_PSIZE(bp));
 204         DDK_SET_COMPRESS(&drrw->drr_key, BP_GET_COMPRESS(bp));
 205         drrw->drr_key.ddk_cksum = bp->blk_cksum;
 206
 207         if (dump_bytes(dsp, dsp->dsa_drr, sizeof (dmu_replay_record_t)) != 0)
 208                 return (SET_ERROR(EINTR));
 209         if (dump_bytes(dsp, data, blksz) != 0)
 210                 return (SET_ERROR(EINTR));
 211         return (0);
 212 }
 213
 214 static int
 215 dump_spill(dmu_sendarg_t *dsp, uint64_t object, int blksz, void *data)
 216 {
 217         struct drr_spill *drrs = &(dsp->dsa_drr->drr_u.drr_spill);
 218
 219         if (dsp->dsa_pending_op != PENDING_NONE) {
 220                 if (dump_bytes(dsp, dsp->dsa_drr,
 221                     sizeof (dmu_replay_record_t)) != 0)
 222                         return (SET_ERROR(EINTR));
 223                 dsp->dsa_pending_op = PENDING_NONE;
 224         }
 225
 226         /* write a SPILL record */
 227         bzero(dsp->dsa_drr, sizeof (dmu_replay_record_t));
 228         dsp->dsa_drr->drr_type = DRR_SPILL;
 229         drrs->drr_object = object;
 230         drrs->drr_length = blksz;
 231         drrs->drr_toguid = dsp->dsa_toguid;
 232
 233         if (dump_bytes(dsp, dsp->dsa_drr, sizeof (dmu_replay_record_t)))
 234                 return (SET_ERROR(EINTR));
 235         if (dump_bytes(dsp, data, blksz))
 236                 return (SET_ERROR(EINTR));
 237         return (0);
 238 }
 239
 240 static int
 241 dump_freeobjects(dmu_sendarg_t *dsp, uint64_t firstobj, uint64_t numobjs)
 242 {
 243         struct drr_freeobjects *drrfo = &(dsp->dsa_drr->drr_u.drr_freeobjects);
 244
 245         /*
 246          * If there is a pending op, but it's not PENDING_FREEOBJECTS,
 247          * push it out, since free block aggregation can only be done for
 248          * blocks of the same type (i.e., DRR_FREE records can only be
 249          * aggregated with other DRR_FREE records.  DRR_FREEOBJECTS records
 250          * can only be aggregated with other DRR_FREEOBJECTS records.
 251          */
 252         if (dsp->dsa_pending_op != PENDING_NONE &&
 253             dsp->dsa_pending_op != PENDING_FREEOBJECTS) {
 254                 if (dump_bytes(dsp, dsp->dsa_drr,
 255                     sizeof (dmu_replay_record_t)) != 0)
 256                         return (SET_ERROR(EINTR));
 257                 dsp->dsa_pending_op = PENDING_NONE;
 258         }
 259         if (dsp->dsa_pending_op == PENDING_FREEOBJECTS) {
 260                 /*
 261                  * See whether this free object array can be aggregated
 262                  * with pending one
 263                  */
 264                 if (drrfo->drr_firstobj + drrfo->drr_numobjs == firstobj) {
 265                         drrfo->drr_numobjs += numobjs;
 266                         return (0);
 267                 } else {
 268                         /* can't be aggregated.  Push out pending record */
 269                         if (dump_bytes(dsp, dsp->dsa_drr,
 270                             sizeof (dmu_replay_record_t)) != 0)
 271                                 return (SET_ERROR(EINTR));
 272                         dsp->dsa_pending_op = PENDING_NONE;
 273                 }
 274         }
 275
 276         /* write a FREEOBJECTS record */
 277         bzero(dsp->dsa_drr, sizeof (dmu_replay_record_t));
 278         dsp->dsa_drr->drr_type = DRR_FREEOBJECTS;
 279         drrfo->drr_firstobj = firstobj;
 280         drrfo->drr_numobjs = numobjs;
 281         drrfo->drr_toguid = dsp->dsa_toguid;
 282
 283         dsp->dsa_pending_op = PENDING_FREEOBJECTS;
 284
 285         return (0);
 286 }
 287
 288 static int
 289 dump_dnode(dmu_sendarg_t *dsp, uint64_t object, dnode_phys_t *dnp)
 290 {
 291         struct drr_object *drro = &(dsp->dsa_drr->drr_u.drr_object);
 292
 293         if (dnp == NULL || dnp->dn_type == DMU_OT_NONE)
 294                 return (dump_freeobjects(dsp, object, 1));
 295
 296         if (dsp->dsa_pending_op != PENDING_NONE) {
 297                 if (dump_bytes(dsp, dsp->dsa_drr,
 298                     sizeof (dmu_replay_record_t)) != 0)
 299                         return (SET_ERROR(EINTR));
 300                 dsp->dsa_pending_op = PENDING_NONE;
 301         }
 302
 303         /* write an OBJECT record */
 304         bzero(dsp->dsa_drr, sizeof (dmu_replay_record_t));
 305         dsp->dsa_drr->drr_type = DRR_OBJECT;
 306         drro->drr_object = object;
 307         drro->drr_type = dnp->dn_type;
 308         drro->drr_bonustype = dnp->dn_bonustype;
 309         drro->drr_blksz = dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT;
 310         drro->drr_bonuslen = dnp->dn_bonuslen;
 311         drro->drr_checksumtype = dnp->dn_checksum;
 312         drro->drr_compress = dnp->dn_compress;
 313         drro->drr_toguid = dsp->dsa_toguid;
 314
 315         if (dump_bytes(dsp, dsp->dsa_drr, sizeof (dmu_replay_record_t)) != 0)
 316                 return (SET_ERROR(EINTR));
 317
 318         if (dump_bytes(dsp, DN_BONUS(dnp), P2ROUNDUP(dnp->dn_bonuslen, 8)) != 0)
 319                 return (SET_ERROR(EINTR));
 320
 321         /* free anything past the end of the file */
 322         if (dump_free(dsp, object, (dnp->dn_maxblkid + 1) *
 323             (dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT), -1ULL))
 324                 return (SET_ERROR(EINTR));
 325         if (dsp->dsa_err != 0)
 326                 return (SET_ERROR(EINTR));
 327         return (0);
 328 }
 329
 330 #define BP_SPAN(dnp, level) \
 331         (((uint64_t)dnp->dn_datablkszsec) << (SPA_MINBLOCKSHIFT + \
 332         (level) * (dnp->dn_indblkshift - SPA_BLKPTRSHIFT)))
 333
 334 /* ARGSUSED */
 335 static int
 336 backup_cb(spa_t *spa, zilog_t *zilog, const blkptr_t *bp,
 337     const zbookmark_t *zb, const dnode_phys_t *dnp, void *arg)
 338 {
 339         dmu_sendarg_t *dsp = arg;
 340         dmu_object_type_t type = bp ? BP_GET_TYPE(bp) : DMU_OT_NONE;
 341         int err = 0;
 342
 343         if (issig(JUSTLOOKING) && issig(FORREAL))
 344                 return (SET_ERROR(EINTR));
 345
 346         if (zb->zb_object != DMU_META_DNODE_OBJECT &&
 347             DMU_OBJECT_IS_SPECIAL(zb->zb_object)) {
 348                 return (0);
 349         } else if (bp == NULL && zb->zb_object == DMU_META_DNODE_OBJECT) {
 350                 uint64_t span = BP_SPAN(dnp, zb->zb_level);
 351                 uint64_t dnobj = (zb->zb_blkid * span) >> DNODE_SHIFT;
 352                 err = dump_freeobjects(dsp, dnobj, span >> DNODE_SHIFT);
 353         } else if (bp == NULL) {
 354                 uint64_t span = BP_SPAN(dnp, zb->zb_level);
 355                 err = dump_free(dsp, zb->zb_object, zb->zb_blkid * span, span);
 356         } else if (zb->zb_level > 0 || type == DMU_OT_OBJSET) {
 357                 return (0);
 358         } else if (type == DMU_OT_DNODE) {
 359                 dnode_phys_t *blk;
 360                 int i;
 361                 int blksz = BP_GET_LSIZE(bp);
 362                 uint32_t aflags = ARC_WAIT;
 363                 arc_buf_t *abuf;
 364
 365                 if (arc_read(NULL, spa, bp, arc_getbuf_func, &abuf,
 366                     ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL,
 367                     &aflags, zb) != 0)
 368                         return (SET_ERROR(EIO));
 369
 370                 blk = abuf->b_data;
 371                 for (i = 0; i < blksz >> DNODE_SHIFT; i++) {
 372                         uint64_t dnobj = (zb->zb_blkid <<
 373                             (DNODE_BLOCK_SHIFT - DNODE_SHIFT)) + i;
 374                         err = dump_dnode(dsp, dnobj, blk+i);
 375                         if (err != 0)
 376                                 break;
 377                 }
 378                 (void) arc_buf_remove_ref(abuf, &abuf);
 379         } else if (type == DMU_OT_SA) {
 380                 uint32_t aflags = ARC_WAIT;
 381                 arc_buf_t *abuf;
 382                 int blksz = BP_GET_LSIZE(bp);
 383
 384                 if (arc_read(NULL, spa, bp, arc_getbuf_func, &abuf,
 385                     ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL,
 386                     &aflags, zb) != 0)
 387                         return (SET_ERROR(EIO));
 388
 389                 err = dump_spill(dsp, zb->zb_object, blksz, abuf->b_data);
 390                 (void) arc_buf_remove_ref(abuf, &abuf);
 391         } else { /* it's a level-0 block of a regular object */
 392                 uint32_t aflags = ARC_WAIT;
 393                 arc_buf_t *abuf;
 394                 int blksz = BP_GET_LSIZE(bp);
 395
 396                 if (arc_read(NULL, spa, bp, arc_getbuf_func, &abuf,
 397                     ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL,
 398                     &aflags, zb) != 0) {
 399                         if (zfs_send_corrupt_data) {
 400                                 uint64_t *ptr;
 401                                 /* Send a block filled with 0x"zfs badd bloc" */
 402                                 abuf = arc_buf_alloc(spa, blksz, &abuf,
 403                                     ARC_BUFC_DATA);
 404                                 for (ptr = abuf->b_data;
 405                                     (char *)ptr < (char *)abuf->b_data + blksz;
 406                                     ptr++)
 407                                         *ptr = 0x2f5baddb10cULL;
 408                         } else {
 409                                 return (SET_ERROR(EIO));
 410                         }
 411                 }
 412
 413                 err = dump_data(dsp, type, zb->zb_object, zb->zb_blkid * blksz,
 414                     blksz, bp, abuf->b_data);
 415                 (void) arc_buf_remove_ref(abuf, &abuf);
 416         }
 417
 418         ASSERT(err == 0 || err == EINTR);
 419         return (err);
 420 }
 421
 422 /*
 423  * Releases dp, ds, and fromds, using the specified tag.
 424  */
 425 static int
 426 dmu_send_impl(void *tag, dsl_pool_t *dp, dsl_dataset_t *ds,
 427     dsl_dataset_t *fromds, int outfd, vnode_t *vp, offset_t *off)
 428 {
 429         objset_t *os;
 430         dmu_replay_record_t *drr;
 431         dmu_sendarg_t *dsp;
 432         int err;
 433         uint64_t fromtxg = 0;
 434
 435         if (fromds != NULL && !dsl_dataset_is_before(ds, fromds)) {
 436                 dsl_dataset_rele(fromds, tag);
 437                 dsl_dataset_rele(ds, tag);
 438                 dsl_pool_rele(dp, tag);
 439                 return (SET_ERROR(EXDEV));
 440         }
 441
 442         err = dmu_objset_from_ds(ds, &os);
 443         if (err != 0) {
 444                 if (fromds != NULL)
 445                         dsl_dataset_rele(fromds, tag);
 446                 dsl_dataset_rele(ds, tag);
 447                 dsl_pool_rele(dp, tag);
 448                 return (err);
 449         }
 450
 451         drr = kmem_zalloc(sizeof (dmu_replay_record_t), KM_SLEEP);
 452         drr->drr_type = DRR_BEGIN;
 453         drr->drr_u.drr_begin.drr_magic = DMU_BACKUP_MAGIC;
 454         DMU_SET_STREAM_HDRTYPE(drr->drr_u.drr_begin.drr_versioninfo,
 455             DMU_SUBSTREAM);
 456
 457 #ifdef _KERNEL
 458         if (dmu_objset_type(os) == DMU_OST_ZFS) {
 459                 uint64_t version;
 460                 if (zfs_get_zplprop(os, ZFS_PROP_VERSION, &version) != 0) {
 461                         kmem_free(drr, sizeof (dmu_replay_record_t));
 462                         if (fromds != NULL)
 463                                 dsl_dataset_rele(fromds, tag);
 464                         dsl_dataset_rele(ds, tag);
 465                         dsl_pool_rele(dp, tag);
 466                         return (SET_ERROR(EINVAL));
 467                 }
 468                 if (version >= ZPL_VERSION_SA) {
 469                         DMU_SET_FEATUREFLAGS(
 470                             drr->drr_u.drr_begin.drr_versioninfo,
 471                             DMU_BACKUP_FEATURE_SA_SPILL);
 472                 }
 473         }
 474 #endif
 475
 476         drr->drr_u.drr_begin.drr_creation_time =
 477             ds->ds_phys->ds_creation_time;
 478         drr->drr_u.drr_begin.drr_type = dmu_objset_type(os);
 479         if (fromds != NULL && ds->ds_dir != fromds->ds_dir)
 480                 drr->drr_u.drr_begin.drr_flags |= DRR_FLAG_CLONE;
 481         drr->drr_u.drr_begin.drr_toguid = ds->ds_phys->ds_guid;
 482         if (ds->ds_phys->ds_flags & DS_FLAG_CI_DATASET)
 483                 drr->drr_u.drr_begin.drr_flags |= DRR_FLAG_CI_DATA;
 484
 485         if (fromds != NULL)
 486                 drr->drr_u.drr_begin.drr_fromguid = fromds->ds_phys->ds_guid;
 487         dsl_dataset_name(ds, drr->drr_u.drr_begin.drr_toname);
 488
 489         if (fromds != NULL) {
 490                 fromtxg = fromds->ds_phys->ds_creation_txg;
 491                 dsl_dataset_rele(fromds, tag);
 492                 fromds = NULL;
 493         }
 494
 495         dsp = kmem_zalloc(sizeof (dmu_sendarg_t), KM_SLEEP);
 496
 497         dsp->dsa_drr = drr;
 498         dsp->dsa_vp = vp;
 499         dsp->dsa_outfd = outfd;
 500         dsp->dsa_proc = curproc;
 501         dsp->dsa_os = os;
 502         dsp->dsa_off = off;
 503         dsp->dsa_toguid = ds->ds_phys->ds_guid;
 504         ZIO_SET_CHECKSUM(&dsp->dsa_zc, 0, 0, 0, 0);
 505         dsp->dsa_pending_op = PENDING_NONE;
 506
 507         mutex_enter(&ds->ds_sendstream_lock);
 508         list_insert_head(&ds->ds_sendstreams, dsp);
 509         mutex_exit(&ds->ds_sendstream_lock);
 510
 511         if (dump_bytes(dsp, drr, sizeof (dmu_replay_record_t)) != 0) {
 512                 err = dsp->dsa_err;
 513                 goto out;
 514         }
 515
 516         dsl_dataset_long_hold(ds, FTAG);
 517         dsl_pool_rele(dp, tag);
 518
 519         err = traverse_dataset(ds, fromtxg, TRAVERSE_PRE | TRAVERSE_PREFETCH,
 520             backup_cb, dsp);
 521
 522         if (dsp->dsa_pending_op != PENDING_NONE)
 523                 if (dump_bytes(dsp, drr, sizeof (dmu_replay_record_t)) != 0)
 524                         err = SET_ERROR(EINTR);
 525
 526         if (err != 0) {
 527                 if (err == EINTR && dsp->dsa_err != 0)
 528                         err = dsp->dsa_err;
 529                 goto out;
 530         }
 531
 532         bzero(drr, sizeof (dmu_replay_record_t));
 533         drr->drr_type = DRR_END;
 534         drr->drr_u.drr_end.drr_checksum = dsp->dsa_zc;
 535         drr->drr_u.drr_end.drr_toguid = dsp->dsa_toguid;
 536
 537         if (dump_bytes(dsp, drr, sizeof (dmu_replay_record_t)) != 0) {
 538                 err = dsp->dsa_err;
 539                 goto out;
 540         }
 541
 542 out:
 543         mutex_enter(&ds->ds_sendstream_lock);
 544         list_remove(&ds->ds_sendstreams, dsp);
 545         mutex_exit(&ds->ds_sendstream_lock);
 546
 547         kmem_free(drr, sizeof (dmu_replay_record_t));
 548         kmem_free(dsp, sizeof (dmu_sendarg_t));
 549
 550         dsl_dataset_long_rele(ds, FTAG);
 551         dsl_dataset_rele(ds, tag);
 552
 553         return (err);
 554 }
 555
 556 int
 557 dmu_send_obj(const char *pool, uint64_t tosnap, uint64_t fromsnap,
 558     int outfd, vnode_t *vp, offset_t *off)
 559 {
 560         dsl_pool_t *dp;
 561         dsl_dataset_t *ds;
 562         dsl_dataset_t *fromds = NULL;
 563         int err;
 564
 565         err = dsl_pool_hold(pool, FTAG, &dp);
 566         if (err != 0)
 567                 return (err);
 568
 569         err = dsl_dataset_hold_obj(dp, tosnap, FTAG, &ds);
 570         if (err != 0) {
 571                 dsl_pool_rele(dp, FTAG);
 572                 return (err);
 573         }
 574
 575         if (fromsnap != 0) {
 576                 err = dsl_dataset_hold_obj(dp, fromsnap, FTAG, &fromds);
 577                 if (err != 0) {
 578                         dsl_dataset_rele(ds, FTAG);
 579                         dsl_pool_rele(dp, FTAG);
 580                         return (err);
 581                 }
 582         }
 583
 584         return (dmu_send_impl(FTAG, dp, ds, fromds, outfd, vp, off));
 585 }
 586
 587 int
 588 dmu_send(const char *tosnap, const char *fromsnap,
 589     int outfd, vnode_t *vp, offset_t *off)
 590 {
 591         dsl_pool_t *dp;
 592         dsl_dataset_t *ds;
 593         dsl_dataset_t *fromds = NULL;
 594         int err;
 595
 596         if (strchr(tosnap, '@') == NULL)
 597                 return (SET_ERROR(EINVAL));
 598         if (fromsnap != NULL && strchr(fromsnap, '@') == NULL)
 599                 return (SET_ERROR(EINVAL));
 600
 601         err = dsl_pool_hold(tosnap, FTAG, &dp);
 602         if (err != 0)
 603                 return (err);
 604
 605         err = dsl_dataset_hold(dp, tosnap, FTAG, &ds);
 606         if (err != 0) {
 607                 dsl_pool_rele(dp, FTAG);
 608                 return (err);
 609         }
 610
 611         if (fromsnap != NULL) {
 612                 err = dsl_dataset_hold(dp, fromsnap, FTAG, &fromds);
 613                 if (err != 0) {
 614                         dsl_dataset_rele(ds, FTAG);
 615                         dsl_pool_rele(dp, FTAG);
 616                         return (err);
 617                 }
 618         }
 619         return (dmu_send_impl(FTAG, dp, ds, fromds, outfd, vp, off));
 620 }
 621
 622 int
 623 dmu_send_estimate(dsl_dataset_t *ds, dsl_dataset_t *fromds, uint64_t *sizep)
 624 {
 625         int err;
 626         uint64_t size, recordsize;
 627         ASSERTV(dsl_pool_t *dp = ds->ds_dir->dd_pool);
 628
 629         ASSERT(dsl_pool_config_held(dp));
 630
 631         /* tosnap must be a snapshot */
 632         if (!dsl_dataset_is_snapshot(ds))
 633                 return (SET_ERROR(EINVAL));
 634
 635         /*
 636          * fromsnap must be an earlier snapshot from the same fs as tosnap,
 637          * or the origin's fs.
 638          */
 639         if (fromds != NULL && !dsl_dataset_is_before(ds, fromds))
 640                 return (SET_ERROR(EXDEV));
 641
 642         /* Get uncompressed size estimate of changed data. */
 643         if (fromds == NULL) {
 644                 size = ds->ds_phys->ds_uncompressed_bytes;
 645         } else {
 646                 uint64_t used, comp;
 647                 err = dsl_dataset_space_written(fromds, ds,
 648                     &used, &comp, &size);
 649                 if (err != 0)
 650                         return (err);
 651         }
 652
 653         /*
 654          * Assume that space (both on-disk and in-stream) is dominated by
 655          * data.  We will adjust for indirect blocks and the copies property,
 656          * but ignore per-object space used (eg, dnodes and DRR_OBJECT records).
 657          */
 658
 659         /*
 660          * Subtract out approximate space used by indirect blocks.
 661          * Assume most space is used by data blocks (non-indirect, non-dnode).
 662          * Assume all blocks are recordsize.  Assume ditto blocks and
 663          * internal fragmentation counter out compression.
 664          *
 665          * Therefore, space used by indirect blocks is sizeof(blkptr_t) per
 666          * block, which we observe in practice.
 667          */
 668         err = dsl_prop_get_int_ds(ds, "recordsize", &recordsize);
 669         if (err != 0)
 670                 return (err);
 671         size -= size / recordsize * sizeof (blkptr_t);
 672
 673         /* Add in the space for the record associated with each block. */
 674         size += size / recordsize * sizeof (dmu_replay_record_t);
 675
 676         *sizep = size;
 677
 678         return (0);
 679 }
 680
 681 typedef struct dmu_recv_begin_arg {
 682         const char *drba_origin;
 683         dmu_recv_cookie_t *drba_cookie;
 684         cred_t *drba_cred;
 685 } dmu_recv_begin_arg_t;
 686
 687 static int
 688 recv_begin_check_existing_impl(dmu_recv_begin_arg_t *drba, dsl_dataset_t *ds,
 689     uint64_t fromguid)
 690 {
 691         uint64_t val;
 692         int error;
 693         dsl_pool_t *dp = ds->ds_dir->dd_pool;
 694
 695         /* must not have any changes since most recent snapshot */
 696         if (!drba->drba_cookie->drc_force &&
 697             dsl_dataset_modified_since_lastsnap(ds))
 698                 return (SET_ERROR(ETXTBSY));
 699
 700         /* temporary clone name must not exist */
 701         error = zap_lookup(dp->dp_meta_objset,
 702             ds->ds_dir->dd_phys->dd_child_dir_zapobj, recv_clone_name,
 703             8, 1, &val);
 704         if (error != ENOENT)
 705                 return (error == 0 ? EBUSY : error);
 706
 707         /* new snapshot name must not exist */
 708         error = zap_lookup(dp->dp_meta_objset,
 709             ds->ds_phys->ds_snapnames_zapobj, drba->drba_cookie->drc_tosnap,
 710             8, 1, &val);
 711         if (error != ENOENT)
 712                 return (error == 0 ? EEXIST : error);
 713
 714         if (fromguid != 0) {
 715                 /* if incremental, most recent snapshot must match fromguid */
 716                 if (ds->ds_prev == NULL)
 717                         return (SET_ERROR(ENODEV));
 718
 719                 /*
 720                  * most recent snapshot must match fromguid, or there are no
 721                  * changes since the fromguid one
 722                  */
 723                 if (ds->ds_prev->ds_phys->ds_guid != fromguid) {
 724                         uint64_t birth = ds->ds_prev->ds_phys->ds_bp.blk_birth;
 725                         uint64_t obj = ds->ds_prev->ds_phys->ds_prev_snap_obj;
 726                         while (obj != 0) {
 727                                 dsl_dataset_t *snap;
 728                                 error = dsl_dataset_hold_obj(dp, obj, FTAG,
 729                                     &snap);
 730                                 if (error != 0)
 731                                         return (SET_ERROR(ENODEV));
 732                                 if (snap->ds_phys->ds_creation_txg < birth) {
 733                                         dsl_dataset_rele(snap, FTAG);
 734                                         return (SET_ERROR(ENODEV));
 735                                 }
 736                                 if (snap->ds_phys->ds_guid == fromguid) {
 737                                         dsl_dataset_rele(snap, FTAG);
 738                                         break; /* it's ok */
 739                                 }
 740                                 obj = snap->ds_phys->ds_prev_snap_obj;
 741                                 dsl_dataset_rele(snap, FTAG);
 742                         }
 743                         if (obj == 0)
 744                                 return (SET_ERROR(ENODEV));
 745                 }
 746         } else {
 747                 /* if full, most recent snapshot must be $ORIGIN */
 748                 if (ds->ds_phys->ds_prev_snap_txg >= TXG_INITIAL)
 749                         return (SET_ERROR(ENODEV));
 750         }
 751
 752         return (0);
 753
 754 }
 755
 756 static int
 757 dmu_recv_begin_check(void *arg, dmu_tx_t *tx)
 758 {
 759         dmu_recv_begin_arg_t *drba = arg;
 760         dsl_pool_t *dp = dmu_tx_pool(tx);
 761         struct drr_begin *drrb = drba->drba_cookie->drc_drrb;
 762         uint64_t fromguid = drrb->drr_fromguid;
 763         int flags = drrb->drr_flags;
 764         int error;
 765         dsl_dataset_t *ds;
 766         const char *tofs = drba->drba_cookie->drc_tofs;
 767
 768         /* already checked */
 769         ASSERT3U(drrb->drr_magic, ==, DMU_BACKUP_MAGIC);
 770
 771         if (DMU_GET_STREAM_HDRTYPE(drrb->drr_versioninfo) ==
 772             DMU_COMPOUNDSTREAM ||
 773             drrb->drr_type >= DMU_OST_NUMTYPES ||
 774             ((flags & DRR_FLAG_CLONE) && drba->drba_origin == NULL))
 775                 return (SET_ERROR(EINVAL));
 776
 777         /* Verify pool version supports SA if SA_SPILL feature set */
 778         if ((DMU_GET_FEATUREFLAGS(drrb->drr_versioninfo) &
 779             DMU_BACKUP_FEATURE_SA_SPILL) &&
 780             spa_version(dp->dp_spa) < SPA_VERSION_SA) {
 781                 return (SET_ERROR(ENOTSUP));
 782         }
 783
 784         error = dsl_dataset_hold(dp, tofs, FTAG, &ds);
 785         if (error == 0) {
 786                 /* target fs already exists; recv into temp clone */
 787
 788                 /* Can't recv a clone into an existing fs */
 789                 if (flags & DRR_FLAG_CLONE) {
 790                         dsl_dataset_rele(ds, FTAG);
 791                         return (SET_ERROR(EINVAL));
 792                 }
 793
 794                 error = recv_begin_check_existing_impl(drba, ds, fromguid);
 795                 dsl_dataset_rele(ds, FTAG);
 796         } else if (error == ENOENT) {
 797                 /* target fs does not exist; must be a full backup or clone */
 798                 char buf[MAXNAMELEN];
 799
 800                 /*
 801                  * If it's a non-clone incremental, we are missing the
 802                  * target fs, so fail the recv.
 803                  */
 804                 if (fromguid != 0 && !(flags & DRR_FLAG_CLONE))
 805                         return (SET_ERROR(ENOENT));
 806
 807                 /* Open the parent of tofs */
 808                 ASSERT3U(strlen(tofs), <, MAXNAMELEN);
 809                 (void) strlcpy(buf, tofs, strrchr(tofs, '/') - tofs + 1);
 810                 error = dsl_dataset_hold(dp, buf, FTAG, &ds);
 811                 if (error != 0)
 812                         return (error);
 813
 814                 if (drba->drba_origin != NULL) {
 815                         dsl_dataset_t *origin;
 816                         error = dsl_dataset_hold(dp, drba->drba_origin,
 817                             FTAG, &origin);
 818                         if (error != 0) {
 819                                 dsl_dataset_rele(ds, FTAG);
 820                                 return (error);
 821                         }
 822                         if (!dsl_dataset_is_snapshot(origin)) {
 823                                 dsl_dataset_rele(origin, FTAG);
 824                                 dsl_dataset_rele(ds, FTAG);
 825                                 return (SET_ERROR(EINVAL));
 826                         }
 827                         if (origin->ds_phys->ds_guid != fromguid) {
 828                                 dsl_dataset_rele(origin, FTAG);
 829                                 dsl_dataset_rele(ds, FTAG);
 830                                 return (SET_ERROR(ENODEV));
 831                         }
 832                         dsl_dataset_rele(origin, FTAG);
 833                 }
 834                 dsl_dataset_rele(ds, FTAG);
 835                 error = 0;
 836         }
 837         return (error);
 838 }
 839
 840 static void
 841 dmu_recv_begin_sync(void *arg, dmu_tx_t *tx)
 842 {
 843         dmu_recv_begin_arg_t *drba = arg;
 844         dsl_pool_t *dp = dmu_tx_pool(tx);
 845         struct drr_begin *drrb = drba->drba_cookie->drc_drrb;
 846         const char *tofs = drba->drba_cookie->drc_tofs;
 847         dsl_dataset_t *ds, *newds;
 848         uint64_t dsobj;
 849         int error;
 850         uint64_t crflags;
 851
 852         crflags = (drrb->drr_flags & DRR_FLAG_CI_DATA) ?
 853             DS_FLAG_CI_DATASET : 0;
 854
 855         error = dsl_dataset_hold(dp, tofs, FTAG, &ds);
 856         if (error == 0) {
 857                 /* create temporary clone */
 858                 dsobj = dsl_dataset_create_sync(ds->ds_dir, recv_clone_name,
 859                     ds->ds_prev, crflags, drba->drba_cred, tx);
 860                 dsl_dataset_rele(ds, FTAG);
 861         } else {
 862                 dsl_dir_t *dd;
 863                 const char *tail;
 864                 dsl_dataset_t *origin = NULL;
 865
 866                 VERIFY0(dsl_dir_hold(dp, tofs, FTAG, &dd, &tail));
 867
 868                 if (drba->drba_origin != NULL) {
 869                         VERIFY0(dsl_dataset_hold(dp, drba->drba_origin,
 870                             FTAG, &origin));
 871                 }
 872
 873                 /* Create new dataset. */
 874                 dsobj = dsl_dataset_create_sync(dd,
 875                     strrchr(tofs, '/') + 1,
 876                     origin, crflags, drba->drba_cred, tx);
 877                 if (origin != NULL)
 878                         dsl_dataset_rele(origin, FTAG);
 879                 dsl_dir_rele(dd, FTAG);
 880                 drba->drba_cookie->drc_newfs = B_TRUE;
 881         }
 882         VERIFY0(dsl_dataset_own_obj(dp, dsobj, dmu_recv_tag, &newds));
 883
 884         dmu_buf_will_dirty(newds->ds_dbuf, tx);
 885         newds->ds_phys->ds_flags |= DS_FLAG_INCONSISTENT;
 886
 887         /*
 888          * If we actually created a non-clone, we need to create the
 889          * objset in our new dataset.
 890          */
 891         if (BP_IS_HOLE(dsl_dataset_get_blkptr(newds))) {
 892                 (void) dmu_objset_create_impl(dp->dp_spa,
 893                     newds, dsl_dataset_get_blkptr(newds), drrb->drr_type, tx);
 894         }
 895
 896         drba->drba_cookie->drc_ds = newds;
 897
 898         spa_history_log_internal_ds(newds, "receive", tx, "");
 899 }
 900
 901 /*
 902  * NB: callers *MUST* call dmu_recv_stream() if dmu_recv_begin()
 903  * succeeds; otherwise we will leak the holds on the datasets.
 904  */
 905 int
 906 dmu_recv_begin(char *tofs, char *tosnap, struct drr_begin *drrb,
 907     boolean_t force, char *origin, dmu_recv_cookie_t *drc)
 908 {
 909         dmu_recv_begin_arg_t drba = { 0 };
 910         dmu_replay_record_t *drr;
 911
 912         bzero(drc, sizeof (dmu_recv_cookie_t));
 913         drc->drc_drrb = drrb;
 914         drc->drc_tosnap = tosnap;
 915         drc->drc_tofs = tofs;
 916         drc->drc_force = force;
 917
 918         if (drrb->drr_magic == BSWAP_64(DMU_BACKUP_MAGIC))
 919                 drc->drc_byteswap = B_TRUE;
 920         else if (drrb->drr_magic != DMU_BACKUP_MAGIC)
 921                 return (SET_ERROR(EINVAL));
 922
 923         drr = kmem_zalloc(sizeof (dmu_replay_record_t), KM_SLEEP);
 924         drr->drr_type = DRR_BEGIN;
 925         drr->drr_u.drr_begin = *drc->drc_drrb;
 926         if (drc->drc_byteswap) {
 927                 fletcher_4_incremental_byteswap(drr,
 928                     sizeof (dmu_replay_record_t), &drc->drc_cksum);
 929         } else {
 930                 fletcher_4_incremental_native(drr,
 931                     sizeof (dmu_replay_record_t), &drc->drc_cksum);
 932         }
 933         kmem_free(drr, sizeof (dmu_replay_record_t));
 934
 935         if (drc->drc_byteswap) {
 936                 drrb->drr_magic = BSWAP_64(drrb->drr_magic);
 937                 drrb->drr_versioninfo = BSWAP_64(drrb->drr_versioninfo);
 938                 drrb->drr_creation_time = BSWAP_64(drrb->drr_creation_time);
 939                 drrb->drr_type = BSWAP_32(drrb->drr_type);
 940                 drrb->drr_toguid = BSWAP_64(drrb->drr_toguid);
 941                 drrb->drr_fromguid = BSWAP_64(drrb->drr_fromguid);
 942         }
 943
 944         drba.drba_origin = origin;
 945         drba.drba_cookie = drc;
 946         drba.drba_cred = CRED();
 947
 948         return (dsl_sync_task(tofs, dmu_recv_begin_check, dmu_recv_begin_sync,
 949             &drba, 5));
 950 }
 951
 952 struct restorearg {
 953         int err;
 954         boolean_t byteswap;
 955         vnode_t *vp;
 956         char *buf;
 957         uint64_t voff;
 958         int bufsize; /* amount of memory allocated for buf */
 959         zio_cksum_t cksum;
 960         avl_tree_t *guid_to_ds_map;
 961 };
 962
 963 typedef struct guid_map_entry {
 964         uint64_t        guid;
 965         dsl_dataset_t   *gme_ds;
 966         avl_node_t      avlnode;
 967 } guid_map_entry_t;
 968
 969 static int
 970 guid_compare(const void *arg1, const void *arg2)
 971 {
 972         const guid_map_entry_t *gmep1 = arg1;
 973         const guid_map_entry_t *gmep2 = arg2;
 974
 975         if (gmep1->guid < gmep2->guid)
 976                 return (-1);
 977         else if (gmep1->guid > gmep2->guid)
 978                 return (1);
 979         return (0);
 980 }
 981
 982 static void
 983 free_guid_map_onexit(void *arg)
 984 {
 985         avl_tree_t *ca = arg;
 986         void *cookie = NULL;
 987         guid_map_entry_t *gmep;
 988
 989         while ((gmep = avl_destroy_nodes(ca, &cookie)) != NULL) {
 990                 dsl_dataset_long_rele(gmep->gme_ds, gmep);
 991                 kmem_free(gmep, sizeof (guid_map_entry_t));
 992         }
 993         avl_destroy(ca);
 994         kmem_free(ca, sizeof (avl_tree_t));
 995 }
 996
 997 static void *
 998 restore_read(struct restorearg *ra, int len)
 999 {
1000         void *rv;
1001         int done = 0;
1002
1003         /* some things will require 8-byte alignment, so everything must */
1004         ASSERT0(len % 8);
1005
1006         while (done < len) {
1007                 ssize_t resid;
1008
1009                 ra->err = vn_rdwr(UIO_READ, ra->vp,
1010                     (caddr_t)ra->buf + done, len - done,
1011                     ra->voff, UIO_SYSSPACE, FAPPEND,
1012                     RLIM64_INFINITY, CRED(), &resid);
1013
1014                 if (resid == len - done)
1015                         ra->err = SET_ERROR(EINVAL);
1016                 ra->voff += len - done - resid;
1017                 done = len - resid;
1018                 if (ra->err != 0)
1019                         return (NULL);
1020         }
1021
1022         ASSERT3U(done, ==, len);
1023         rv = ra->buf;
1024         if (ra->byteswap)
1025                 fletcher_4_incremental_byteswap(rv, len, &ra->cksum);
1026         else
1027                 fletcher_4_incremental_native(rv, len, &ra->cksum);
1028         return (rv);
1029 }
1030
1031 noinline static void
1032 backup_byteswap(dmu_replay_record_t *drr)
1033 {
1034 #define DO64(X) (drr->drr_u.X = BSWAP_64(drr->drr_u.X))
1035 #define DO32(X) (drr->drr_u.X = BSWAP_32(drr->drr_u.X))
1036         drr->drr_type = BSWAP_32(drr->drr_type);
1037         drr->drr_payloadlen = BSWAP_32(drr->drr_payloadlen);
1038         switch (drr->drr_type) {
1039         case DRR_BEGIN:
1040                 DO64(drr_begin.drr_magic);
1041                 DO64(drr_begin.drr_versioninfo);
1042                 DO64(drr_begin.drr_creation_time);
1043                 DO32(drr_begin.drr_type);
1044                 DO32(drr_begin.drr_flags);
1045                 DO64(drr_begin.drr_toguid);
1046                 DO64(drr_begin.drr_fromguid);
1047                 break;
1048         case DRR_OBJECT:
1049                 DO64(drr_object.drr_object);
1050                 /* DO64(drr_object.drr_allocation_txg); */
1051                 DO32(drr_object.drr_type);
1052                 DO32(drr_object.drr_bonustype);
1053                 DO32(drr_object.drr_blksz);
1054                 DO32(drr_object.drr_bonuslen);
1055                 DO64(drr_object.drr_toguid);
1056                 break;
1057         case DRR_FREEOBJECTS:
1058                 DO64(drr_freeobjects.drr_firstobj);
1059                 DO64(drr_freeobjects.drr_numobjs);
1060                 DO64(drr_freeobjects.drr_toguid);
1061                 break;
1062         case DRR_WRITE:
1063                 DO64(drr_write.drr_object);
1064                 DO32(drr_write.drr_type);
1065                 DO64(drr_write.drr_offset);
1066                 DO64(drr_write.drr_length);
1067                 DO64(drr_write.drr_toguid);
1068                 DO64(drr_write.drr_key.ddk_cksum.zc_word[0]);
1069                 DO64(drr_write.drr_key.ddk_cksum.zc_word[1]);
1070                 DO64(drr_write.drr_key.ddk_cksum.zc_word[2]);
1071                 DO64(drr_write.drr_key.ddk_cksum.zc_word[3]);
1072                 DO64(drr_write.drr_key.ddk_prop);
1073                 break;
1074         case DRR_WRITE_BYREF:
1075                 DO64(drr_write_byref.drr_object);
1076                 DO64(drr_write_byref.drr_offset);
1077                 DO64(drr_write_byref.drr_length);
1078                 DO64(drr_write_byref.drr_toguid);
1079                 DO64(drr_write_byref.drr_refguid);
1080                 DO64(drr_write_byref.drr_refobject);
1081                 DO64(drr_write_byref.drr_refoffset);
1082                 DO64(drr_write_byref.drr_key.ddk_cksum.zc_word[0]);
1083                 DO64(drr_write_byref.drr_key.ddk_cksum.zc_word[1]);
1084                 DO64(drr_write_byref.drr_key.ddk_cksum.zc_word[2]);
1085                 DO64(drr_write_byref.drr_key.ddk_cksum.zc_word[3]);
1086                 DO64(drr_write_byref.drr_key.ddk_prop);
1087                 break;
1088         case DRR_FREE:
1089                 DO64(drr_free.drr_object);
1090                 DO64(drr_free.drr_offset);
1091                 DO64(drr_free.drr_length);
1092                 DO64(drr_free.drr_toguid);
1093                 break;
1094         case DRR_SPILL:
1095                 DO64(drr_spill.drr_object);
1096                 DO64(drr_spill.drr_length);
1097                 DO64(drr_spill.drr_toguid);
1098                 break;
1099         case DRR_END:
1100                 DO64(drr_end.drr_checksum.zc_word[0]);
1101                 DO64(drr_end.drr_checksum.zc_word[1]);
1102                 DO64(drr_end.drr_checksum.zc_word[2]);
1103                 DO64(drr_end.drr_checksum.zc_word[3]);
1104                 DO64(drr_end.drr_toguid);
1105                 break;
1106         default:
1107                 break;
1108         }
1109 #undef DO64
1110 #undef DO32
1111 }
1112
1113 noinline static int
1114 restore_object(struct restorearg *ra, objset_t *os, struct drr_object *drro)
1115 {
1116         int err;
1117         dmu_tx_t *tx;
1118         void *data = NULL;
1119
1120         if (drro->drr_type == DMU_OT_NONE ||
1121             !DMU_OT_IS_VALID(drro->drr_type) ||
1122             !DMU_OT_IS_VALID(drro->drr_bonustype) ||
1123             drro->drr_checksumtype >= ZIO_CHECKSUM_FUNCTIONS ||
1124             drro->drr_compress >= ZIO_COMPRESS_FUNCTIONS ||
1125             P2PHASE(drro->drr_blksz, SPA_MINBLOCKSIZE) ||
1126             drro->drr_blksz < SPA_MINBLOCKSIZE ||
1127             drro->drr_blksz > SPA_MAXBLOCKSIZE ||
1128             drro->drr_bonuslen > DN_MAX_BONUSLEN) {
1129                 return (SET_ERROR(EINVAL));
1130         }
1131
1132         err = dmu_object_info(os, drro->drr_object, NULL);
1133
1134         if (err != 0 && err != ENOENT)
1135                 return (SET_ERROR(EINVAL));
1136
1137         if (drro->drr_bonuslen) {
1138                 data = restore_read(ra, P2ROUNDUP(drro->drr_bonuslen, 8));
1139                 if (ra->err != 0)
1140                         return (ra->err);
1141         }
1142
1143         if (err == ENOENT) {
1144                 /* currently free, want to be allocated */
1145                 tx = dmu_tx_create(os);
1146                 dmu_tx_hold_bonus(tx, DMU_NEW_OBJECT);
1147                 err = dmu_tx_assign(tx, TXG_WAIT);
1148                 if (err != 0) {
1149                         dmu_tx_abort(tx);
1150                         return (err);
1151                 }
1152                 err = dmu_object_claim(os, drro->drr_object,
1153                     drro->drr_type, drro->drr_blksz,
1154                     drro->drr_bonustype, drro->drr_bonuslen, tx);
1155                 dmu_tx_commit(tx);
1156         } else {
1157                 /* currently allocated, want to be allocated */
1158                 err = dmu_object_reclaim(os, drro->drr_object,
1159                     drro->drr_type, drro->drr_blksz,
1160                     drro->drr_bonustype, drro->drr_bonuslen);
1161         }
1162         if (err != 0) {
1163                 return (SET_ERROR(EINVAL));
1164         }
1165
1166         tx = dmu_tx_create(os);
1167         dmu_tx_hold_bonus(tx, drro->drr_object);
1168         err = dmu_tx_assign(tx, TXG_WAIT);
1169         if (err != 0) {
1170                 dmu_tx_abort(tx);
1171                 return (err);
1172         }
1173
1174         dmu_object_set_checksum(os, drro->drr_object, drro->drr_checksumtype,
1175             tx);
1176         dmu_object_set_compress(os, drro->drr_object, drro->drr_compress, tx);
1177
1178         if (data != NULL) {
1179                 dmu_buf_t *db;
1180
1181                 VERIFY(0 == dmu_bonus_hold(os, drro->drr_object, FTAG, &db));
1182                 dmu_buf_will_dirty(db, tx);
1183
1184                 ASSERT3U(db->db_size, >=, drro->drr_bonuslen);
1185                 bcopy(data, db->db_data, drro->drr_bonuslen);
1186                 if (ra->byteswap) {
1187                         dmu_object_byteswap_t byteswap =
1188                             DMU_OT_BYTESWAP(drro->drr_bonustype);
1189                         dmu_ot_byteswap[byteswap].ob_func(db->db_data,
1190                             drro->drr_bonuslen);
1191                 }
1192                 dmu_buf_rele(db, FTAG);
1193         }
1194         dmu_tx_commit(tx);
1195         return (0);
1196 }
1197
1198 /* ARGSUSED */
1199 noinline static int
1200 restore_freeobjects(struct restorearg *ra, objset_t *os,
1201     struct drr_freeobjects *drrfo)
1202 {
1203         uint64_t obj;
1204
1205         if (drrfo->drr_firstobj + drrfo->drr_numobjs < drrfo->drr_firstobj)
1206                 return (SET_ERROR(EINVAL));
1207
1208         for (obj = drrfo->drr_firstobj;
1209             obj < drrfo->drr_firstobj + drrfo->drr_numobjs;
1210             (void) dmu_object_next(os, &obj, FALSE, 0)) {
1211                 int err;
1212
1213                 if (dmu_object_info(os, obj, NULL) != 0)
1214                         continue;
1215
1216                 err = dmu_free_object(os, obj);
1217                 if (err != 0)
1218                         return (err);
1219         }
1220         return (0);
1221 }
1222
1223 noinline static int
1224 restore_write(struct restorearg *ra, objset_t *os,
1225     struct drr_write *drrw)
1226 {
1227         dmu_tx_t *tx;
1228         void *data;
1229         int err;
1230
1231         if (drrw->drr_offset + drrw->drr_length < drrw->drr_offset ||
1232             !DMU_OT_IS_VALID(drrw->drr_type))
1233                 return (SET_ERROR(EINVAL));
1234
1235         data = restore_read(ra, drrw->drr_length);
1236         if (data == NULL)
1237                 return (ra->err);
1238
1239         if (dmu_object_info(os, drrw->drr_object, NULL) != 0)
1240                 return (SET_ERROR(EINVAL));
1241
1242         tx = dmu_tx_create(os);
1243
1244         dmu_tx_hold_write(tx, drrw->drr_object,
1245             drrw->drr_offset, drrw->drr_length);
1246         err = dmu_tx_assign(tx, TXG_WAIT);
1247         if (err != 0) {
1248                 dmu_tx_abort(tx);
1249                 return (err);
1250         }
1251         if (ra->byteswap) {
1252                 dmu_object_byteswap_t byteswap =
1253                     DMU_OT_BYTESWAP(drrw->drr_type);
1254                 dmu_ot_byteswap[byteswap].ob_func(data, drrw->drr_length);
1255         }
1256         dmu_write(os, drrw->drr_object,
1257             drrw->drr_offset, drrw->drr_length, data, tx);
1258         dmu_tx_commit(tx);
1259         return (0);
1260 }
1261
1262 /*
1263  * Handle a DRR_WRITE_BYREF record.  This record is used in dedup'ed
1264  * streams to refer to a copy of the data that is already on the
1265  * system because it came in earlier in the stream.  This function
1266  * finds the earlier copy of the data, and uses that copy instead of
1267  * data from the stream to fulfill this write.
1268  */
1269 static int
1270 restore_write_byref(struct restorearg *ra, objset_t *os,
1271     struct drr_write_byref *drrwbr)
1272 {
1273         dmu_tx_t *tx;
1274         int err;
1275         guid_map_entry_t gmesrch;
1276         guid_map_entry_t *gmep;
1277         avl_index_t     where;
1278         objset_t *ref_os = NULL;
1279         dmu_buf_t *dbp;
1280
1281         if (drrwbr->drr_offset + drrwbr->drr_length < drrwbr->drr_offset)
1282                 return (SET_ERROR(EINVAL));
1283
1284         /*
1285          * If the GUID of the referenced dataset is different from the
1286          * GUID of the target dataset, find the referenced dataset.
1287          */
1288         if (drrwbr->drr_toguid != drrwbr->drr_refguid) {
1289                 gmesrch.guid = drrwbr->drr_refguid;
1290                 if ((gmep = avl_find(ra->guid_to_ds_map, &gmesrch,
1291                     &where)) == NULL) {
1292                         return (SET_ERROR(EINVAL));
1293                 }
1294                 if (dmu_objset_from_ds(gmep->gme_ds, &ref_os))
1295                         return (SET_ERROR(EINVAL));
1296         } else {
1297                 ref_os = os;
1298         }
1299
1300         err = dmu_buf_hold(ref_os, drrwbr->drr_refobject,
1301             drrwbr->drr_refoffset, FTAG, &dbp, DMU_READ_PREFETCH);
1302         if (err)
1303                 return (err);
1304
1305         tx = dmu_tx_create(os);
1306
1307         dmu_tx_hold_write(tx, drrwbr->drr_object,
1308             drrwbr->drr_offset, drrwbr->drr_length);
1309         err = dmu_tx_assign(tx, TXG_WAIT);
1310         if (err != 0) {
1311                 dmu_tx_abort(tx);
1312                 return (err);
1313         }
1314         dmu_write(os, drrwbr->drr_object,
1315             drrwbr->drr_offset, drrwbr->drr_length, dbp->db_data, tx);
1316         dmu_buf_rele(dbp, FTAG);
1317         dmu_tx_commit(tx);
1318         return (0);
1319 }
1320
1321 static int
1322 restore_spill(struct restorearg *ra, objset_t *os, struct drr_spill *drrs)
1323 {
1324         dmu_tx_t *tx;
1325         void *data;
1326         dmu_buf_t *db, *db_spill;
1327         int err;
1328
1329         if (drrs->drr_length < SPA_MINBLOCKSIZE ||
1330             drrs->drr_length > SPA_MAXBLOCKSIZE)
1331                 return (SET_ERROR(EINVAL));
1332
1333         data = restore_read(ra, drrs->drr_length);
1334         if (data == NULL)
1335                 return (ra->err);
1336
1337         if (dmu_object_info(os, drrs->drr_object, NULL) != 0)
1338                 return (SET_ERROR(EINVAL));
1339
1340         VERIFY(0 == dmu_bonus_hold(os, drrs->drr_object, FTAG, &db));
1341         if ((err = dmu_spill_hold_by_bonus(db, FTAG, &db_spill)) != 0) {
1342                 dmu_buf_rele(db, FTAG);
1343                 return (err);
1344         }
1345
1346         tx = dmu_tx_create(os);
1347
1348         dmu_tx_hold_spill(tx, db->db_object);
1349
1350         err = dmu_tx_assign(tx, TXG_WAIT);
1351         if (err != 0) {
1352                 dmu_buf_rele(db, FTAG);
1353                 dmu_buf_rele(db_spill, FTAG);
1354                 dmu_tx_abort(tx);
1355                 return (err);
1356         }
1357         dmu_buf_will_dirty(db_spill, tx);
1358
1359         if (db_spill->db_size < drrs->drr_length)
1360                 VERIFY(0 == dbuf_spill_set_blksz(db_spill,
1361                     drrs->drr_length, tx));
1362         bcopy(data, db_spill->db_data, drrs->drr_length);
1363
1364         dmu_buf_rele(db, FTAG);
1365         dmu_buf_rele(db_spill, FTAG);
1366
1367         dmu_tx_commit(tx);
1368         return (0);
1369 }
1370
1371 /* ARGSUSED */
1372 noinline static int
1373 restore_free(struct restorearg *ra, objset_t *os,
1374     struct drr_free *drrf)
1375 {
1376         int err;
1377
1378         if (drrf->drr_length != -1ULL &&
1379             drrf->drr_offset + drrf->drr_length < drrf->drr_offset)
1380                 return (SET_ERROR(EINVAL));
1381
1382         if (dmu_object_info(os, drrf->drr_object, NULL) != 0)
1383                 return (SET_ERROR(EINVAL));
1384
1385         err = dmu_free_long_range(os, drrf->drr_object,
1386             drrf->drr_offset, drrf->drr_length);
1387         return (err);
1388 }
1389
1390 /* used to destroy the drc_ds on error */
1391 static void
1392 dmu_recv_cleanup_ds(dmu_recv_cookie_t *drc)
1393 {
1394         char name[MAXNAMELEN];
1395         dsl_dataset_name(drc->drc_ds, name);
1396         dsl_dataset_disown(drc->drc_ds, dmu_recv_tag);
1397         (void) dsl_destroy_head(name);
1398 }
1399
1400 /*
1401  * NB: callers *must* call dmu_recv_end() if this succeeds.
1402  */
1403 int
1404 dmu_recv_stream(dmu_recv_cookie_t *drc, vnode_t *vp, offset_t *voffp,
1405     int cleanup_fd, uint64_t *action_handlep)
1406 {
1407         struct restorearg ra = { 0 };
1408         dmu_replay_record_t *drr;
1409         objset_t *os;
1410         zio_cksum_t pcksum;
1411         int featureflags;
1412
1413         ra.byteswap = drc->drc_byteswap;
1414         ra.cksum = drc->drc_cksum;
1415         ra.vp = vp;
1416         ra.voff = *voffp;
1417         ra.bufsize = 1<<20;
1418         ra.buf = vmem_alloc(ra.bufsize, KM_SLEEP);
1419
1420         /* these were verified in dmu_recv_begin */
1421         ASSERT3U(DMU_GET_STREAM_HDRTYPE(drc->drc_drrb->drr_versioninfo), ==,
1422             DMU_SUBSTREAM);
1423         ASSERT3U(drc->drc_drrb->drr_type, <, DMU_OST_NUMTYPES);
1424
1425         /*
1426          * Open the objset we are modifying.
1427          */
1428         VERIFY0(dmu_objset_from_ds(drc->drc_ds, &os));
1429
1430         ASSERT(drc->drc_ds->ds_phys->ds_flags & DS_FLAG_INCONSISTENT);
1431
1432         featureflags = DMU_GET_FEATUREFLAGS(drc->drc_drrb->drr_versioninfo);
1433
1434         /* if this stream is dedup'ed, set up the avl tree for guid mapping */
1435         if (featureflags & DMU_BACKUP_FEATURE_DEDUP) {
1436                 minor_t minor;
1437
1438                 if (cleanup_fd == -1) {
1439                         ra.err = SET_ERROR(EBADF);
1440                         goto out;
1441                 }
1442                 ra.err = zfs_onexit_fd_hold(cleanup_fd, &minor);
1443                 if (ra.err != 0) {
1444                         cleanup_fd = -1;
1445                         goto out;
1446                 }
1447
1448                 if (*action_handlep == 0) {
1449                         ra.guid_to_ds_map =
1450                             kmem_alloc(sizeof (avl_tree_t), KM_SLEEP);
1451                         avl_create(ra.guid_to_ds_map, guid_compare,
1452                             sizeof (guid_map_entry_t),
1453                             offsetof(guid_map_entry_t, avlnode));
1454                         ra.err = zfs_onexit_add_cb(minor,
1455                             free_guid_map_onexit, ra.guid_to_ds_map,
1456                             action_handlep);
1457                         if (ra.err != 0)
1458                                 goto out;
1459                 } else {
1460                         ra.err = zfs_onexit_cb_data(minor, *action_handlep,
1461                             (void **)&ra.guid_to_ds_map);
1462                         if (ra.err != 0)
1463                                 goto out;
1464                 }
1465
1466                 drc->drc_guid_to_ds_map = ra.guid_to_ds_map;
1467         }
1468
1469         /*
1470          * Read records and process them.
1471          */
1472         pcksum = ra.cksum;
1473         while (ra.err == 0 &&
1474             NULL != (drr = restore_read(&ra, sizeof (*drr)))) {
1475                 if (issig(JUSTLOOKING) && issig(FORREAL)) {
1476                         ra.err = SET_ERROR(EINTR);
1477                         goto out;
1478                 }
1479
1480                 if (ra.byteswap)
1481                         backup_byteswap(drr);
1482
1483                 switch (drr->drr_type) {
1484                 case DRR_OBJECT:
1485                 {
1486                         /*
1487                          * We need to make a copy of the record header,
1488                          * because restore_{object,write} may need to
1489                          * restore_read(), which will invalidate drr.
1490                          */
1491                         struct drr_object drro = drr->drr_u.drr_object;
1492                         ra.err = restore_object(&ra, os, &drro);
1493                         break;
1494                 }
1495                 case DRR_FREEOBJECTS:
1496                 {
1497                         struct drr_freeobjects drrfo =
1498                             drr->drr_u.drr_freeobjects;
1499                         ra.err = restore_freeobjects(&ra, os, &drrfo);
1500                         break;
1501                 }
1502                 case DRR_WRITE:
1503                 {
1504                         struct drr_write drrw = drr->drr_u.drr_write;
1505                         ra.err = restore_write(&ra, os, &drrw);
1506                         break;
1507                 }
1508                 case DRR_WRITE_BYREF:
1509                 {
1510                         struct drr_write_byref drrwbr =
1511                             drr->drr_u.drr_write_byref;
1512                         ra.err = restore_write_byref(&ra, os, &drrwbr);
1513                         break;
1514                 }
1515                 case DRR_FREE:
1516                 {
1517                         struct drr_free drrf = drr->drr_u.drr_free;
1518                         ra.err = restore_free(&ra, os, &drrf);
1519                         break;
1520                 }
1521                 case DRR_END:
1522                 {
1523                         struct drr_end drre = drr->drr_u.drr_end;
1524                         /*
1525                          * We compare against the *previous* checksum
1526                          * value, because the stored checksum is of
1527                          * everything before the DRR_END record.
1528                          */
1529                         if (!ZIO_CHECKSUM_EQUAL(drre.drr_checksum, pcksum))
1530                                 ra.err = SET_ERROR(ECKSUM);
1531                         goto out;
1532                 }
1533                 case DRR_SPILL:
1534                 {
1535                         struct drr_spill drrs = drr->drr_u.drr_spill;
1536                         ra.err = restore_spill(&ra, os, &drrs);
1537                         break;
1538                 }
1539                 default:
1540                         ra.err = SET_ERROR(EINVAL);
1541                         goto out;
1542                 }
1543                 pcksum = ra.cksum;
1544         }
1545         ASSERT(ra.err != 0);
1546
1547 out:
1548         if ((featureflags & DMU_BACKUP_FEATURE_DEDUP) && (cleanup_fd != -1))
1549                 zfs_onexit_fd_rele(cleanup_fd);
1550
1551         if (ra.err != 0) {
1552                 /*
1553                  * destroy what we created, so we don't leave it in the
1554                  * inconsistent restoring state.
1555                  */
1556                 dmu_recv_cleanup_ds(drc);
1557         }
1558
1559         vmem_free(ra.buf, ra.bufsize);
1560         *voffp = ra.voff;
1561         return (ra.err);
1562 }
1563
1564 static int
1565 dmu_recv_end_check(void *arg, dmu_tx_t *tx)
1566 {
1567         dmu_recv_cookie_t *drc = arg;
1568         dsl_pool_t *dp = dmu_tx_pool(tx);
1569         int error;
1570
1571         ASSERT3P(drc->drc_ds->ds_owner, ==, dmu_recv_tag);
1572
1573         if (!drc->drc_newfs) {
1574                 dsl_dataset_t *origin_head;
1575
1576                 error = dsl_dataset_hold(dp, drc->drc_tofs, FTAG, &origin_head);
1577                 if (error != 0)
1578                         return (error);
1579                 error = dsl_dataset_clone_swap_check_impl(drc->drc_ds,
1580                     origin_head, drc->drc_force);
1581                 if (error != 0) {
1582                         dsl_dataset_rele(origin_head, FTAG);
1583                         return (error);
1584                 }
1585                 error = dsl_dataset_snapshot_check_impl(origin_head,
1586                     drc->drc_tosnap, tx);
1587                 dsl_dataset_rele(origin_head, FTAG);
1588                 if (error != 0)
1589                         return (error);
1590
1591                 error = dsl_destroy_head_check_impl(drc->drc_ds, 1);
1592         } else {
1593                 error = dsl_dataset_snapshot_check_impl(drc->drc_ds,
1594                     drc->drc_tosnap, tx);
1595         }
1596         return (error);
1597 }
1598
1599 static void
1600 dmu_recv_end_sync(void *arg, dmu_tx_t *tx)
1601 {
1602         dmu_recv_cookie_t *drc = arg;
1603         dsl_pool_t *dp = dmu_tx_pool(tx);
1604
1605         spa_history_log_internal_ds(drc->drc_ds, "finish receiving",
1606             tx, "snap=%s", drc->drc_tosnap);
1607
1608         if (!drc->drc_newfs) {
1609                 dsl_dataset_t *origin_head;
1610
1611                 VERIFY0(dsl_dataset_hold(dp, drc->drc_tofs, FTAG,
1612                     &origin_head));
1613                 dsl_dataset_clone_swap_sync_impl(drc->drc_ds,
1614                     origin_head, tx);
1615                 dsl_dataset_snapshot_sync_impl(origin_head,
1616                     drc->drc_tosnap, tx);
1617
1618                 /* set snapshot's creation time and guid */
1619                 dmu_buf_will_dirty(origin_head->ds_prev->ds_dbuf, tx);
1620                 origin_head->ds_prev->ds_phys->ds_creation_time =
1621                     drc->drc_drrb->drr_creation_time;
1622                 origin_head->ds_prev->ds_phys->ds_guid =
1623                     drc->drc_drrb->drr_toguid;
1624                 origin_head->ds_prev->ds_phys->ds_flags &=
1625                     ~DS_FLAG_INCONSISTENT;
1626
1627                 dmu_buf_will_dirty(origin_head->ds_dbuf, tx);
1628                 origin_head->ds_phys->ds_flags &= ~DS_FLAG_INCONSISTENT;
1629
1630                 dsl_dataset_rele(origin_head, FTAG);
1631                 dsl_destroy_head_sync_impl(drc->drc_ds, tx);
1632         } else {
1633                 dsl_dataset_t *ds = drc->drc_ds;
1634
1635                 dsl_dataset_snapshot_sync_impl(ds, drc->drc_tosnap, tx);
1636
1637                 /* set snapshot's creation time and guid */
1638                 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx);
1639                 ds->ds_prev->ds_phys->ds_creation_time =
1640                     drc->drc_drrb->drr_creation_time;
1641                 ds->ds_prev->ds_phys->ds_guid = drc->drc_drrb->drr_toguid;
1642                 ds->ds_prev->ds_phys->ds_flags &= ~DS_FLAG_INCONSISTENT;
1643
1644                 dmu_buf_will_dirty(ds->ds_dbuf, tx);
1645                 ds->ds_phys->ds_flags &= ~DS_FLAG_INCONSISTENT;
1646         }
1647         drc->drc_newsnapobj = drc->drc_ds->ds_phys->ds_prev_snap_obj;
1648         /*
1649          * Release the hold from dmu_recv_begin.  This must be done before
1650          * we return to open context, so that when we free the dataset's dnode,
1651          * we can evict its bonus buffer.
1652          */
1653         dsl_dataset_disown(drc->drc_ds, dmu_recv_tag);
1654         drc->drc_ds = NULL;
1655 }
1656
1657 static int
1658 add_ds_to_guidmap(const char *name, avl_tree_t *guid_map, uint64_t snapobj)
1659 {
1660         dsl_pool_t *dp;
1661         dsl_dataset_t *snapds;
1662         guid_map_entry_t *gmep;
1663         int err;
1664
1665         ASSERT(guid_map != NULL);
1666
1667         err = dsl_pool_hold(name, FTAG, &dp);
1668         if (err != 0)
1669                 return (err);
1670         err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &snapds);
1671         if (err == 0) {
1672                 gmep = kmem_alloc(sizeof (guid_map_entry_t), KM_SLEEP);
1673                 gmep->guid = snapds->ds_phys->ds_guid;
1674                 gmep->gme_ds = snapds;
1675                 avl_add(guid_map, gmep);
1676                 dsl_dataset_long_hold(snapds, gmep);
1677                 dsl_dataset_rele(snapds, FTAG);
1678         }
1679
1680         dsl_pool_rele(dp, FTAG);
1681         return (err);
1682 }
1683
1684 static int dmu_recv_end_modified_blocks = 3;
1685
1686 static int
1687 dmu_recv_existing_end(dmu_recv_cookie_t *drc)
1688 {
1689         int error;
1690
1691 #ifdef _KERNEL
1692         char *name;
1693
1694         /*
1695          * We will be destroying the ds; make sure its origin is unmounted if
1696          * necessary.
1697          */
1698         name = kmem_alloc(MAXNAMELEN, KM_SLEEP);
1699         dsl_dataset_name(drc->drc_ds, name);
1700         zfs_destroy_unmount_origin(name);
1701         kmem_free(name, MAXNAMELEN);
1702 #endif
1703
1704         error = dsl_sync_task(drc->drc_tofs,
1705             dmu_recv_end_check, dmu_recv_end_sync, drc,
1706             dmu_recv_end_modified_blocks);
1707
1708         if (error != 0)
1709                 dmu_recv_cleanup_ds(drc);
1710         return (error);
1711 }
1712
1713 static int
1714 dmu_recv_new_end(dmu_recv_cookie_t *drc)
1715 {
1716         int error;
1717
1718         error = dsl_sync_task(drc->drc_tofs,
1719             dmu_recv_end_check, dmu_recv_end_sync, drc,
1720             dmu_recv_end_modified_blocks);
1721
1722         if (error != 0) {
1723                 dmu_recv_cleanup_ds(drc);
1724         } else if (drc->drc_guid_to_ds_map != NULL) {
1725                 (void) add_ds_to_guidmap(drc->drc_tofs,
1726                     drc->drc_guid_to_ds_map,
1727                     drc->drc_newsnapobj);
1728         }
1729         return (error);
1730 }
1731
1732 int
1733 dmu_recv_end(dmu_recv_cookie_t *drc)
1734 {
1735         if (drc->drc_newfs)
1736                 return (dmu_recv_new_end(drc));
1737         else
1738                 return (dmu_recv_existing_end(drc));
1739 }