lib/libzfs/libzfs_sendrecv.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 /*
  23  * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 #include <assert.h>
  28 #include <ctype.h>
  29 #include <errno.h>
  30 #include <libdevinfo.h>
  31 #include <libintl.h>
  32 #include <stdio.h>
  33 #include <stdlib.h>
  34 #include <strings.h>
  35 #include <unistd.h>
  36 #include <stddef.h>
  37 #include <fcntl.h>
  38 #include <sys/mount.h>
  39 #include <sys/mntent.h>
  40 #include <sys/mnttab.h>
  41 #include <sys/avl.h>
  42 #include <stddef.h>
  43
  44 #include <libzfs.h>
  45
  46 #include "zfs_namecheck.h"
  47 #include "zfs_prop.h"
  48 #include "libzfs_impl.h"
  49
  50 #include <fletcher.c> /* XXX */
  51
  52 static int zfs_receive_impl(libzfs_handle_t *, const char *, recvflags_t,
  53     int, avl_tree_t *, char **);
  54
  55 /*
  56  * Routines for dealing with the AVL tree of fs-nvlists
  57  */
  58 typedef struct fsavl_node {
  59         avl_node_t fn_node;
  60         nvlist_t *fn_nvfs;
  61         char *fn_snapname;
  62         uint64_t fn_guid;
  63 } fsavl_node_t;
  64
  65 static int
  66 fsavl_compare(const void *arg1, const void *arg2)
  67 {
  68         const fsavl_node_t *fn1 = arg1;
  69         const fsavl_node_t *fn2 = arg2;
  70
  71         if (fn1->fn_guid > fn2->fn_guid)
  72                 return (+1);
  73         else if (fn1->fn_guid < fn2->fn_guid)
  74                 return (-1);
  75         else
  76                 return (0);
  77 }
  78
  79 /*
  80  * Given the GUID of a snapshot, find its containing filesystem and
  81  * (optionally) name.
  82  */
  83 static nvlist_t *
  84 fsavl_find(avl_tree_t *avl, uint64_t snapguid, char **snapname)
  85 {
  86         fsavl_node_t fn_find;
  87         fsavl_node_t *fn;
  88
  89         fn_find.fn_guid = snapguid;
  90
  91         fn = avl_find(avl, &fn_find, NULL);
  92         if (fn) {
  93                 if (snapname)
  94                         *snapname = fn->fn_snapname;
  95                 return (fn->fn_nvfs);
  96         }
  97         return (NULL);
  98 }
  99
 100 static void
 101 fsavl_destroy(avl_tree_t *avl)
 102 {
 103         fsavl_node_t *fn;
 104         void *cookie;
 105
 106         if (avl == NULL)
 107                 return;
 108
 109         cookie = NULL;
 110         while ((fn = avl_destroy_nodes(avl, &cookie)) != NULL)
 111                 free(fn);
 112         avl_destroy(avl);
 113         free(avl);
 114 }
 115
 116 /*
 117  * Given an nvlist, produce an avl tree of snapshots, ordered by guid
 118  */
 119 static avl_tree_t *
 120 fsavl_create(nvlist_t *fss)
 121 {
 122         avl_tree_t *fsavl;
 123         nvpair_t *fselem = NULL;
 124
 125         if ((fsavl = malloc(sizeof (avl_tree_t))) == NULL)
 126                 return (NULL);
 127
 128         avl_create(fsavl, fsavl_compare, sizeof (fsavl_node_t),
 129             offsetof(fsavl_node_t, fn_node));
 130
 131         while ((fselem = nvlist_next_nvpair(fss, fselem)) != NULL) {
 132                 nvlist_t *nvfs, *snaps;
 133                 nvpair_t *snapelem = NULL;
 134
 135                 VERIFY(0 == nvpair_value_nvlist(fselem, &nvfs));
 136                 VERIFY(0 == nvlist_lookup_nvlist(nvfs, "snaps", &snaps));
 137
 138                 while ((snapelem =
 139                     nvlist_next_nvpair(snaps, snapelem)) != NULL) {
 140                         fsavl_node_t *fn;
 141                         uint64_t guid;
 142
 143                         VERIFY(0 == nvpair_value_uint64(snapelem, &guid));
 144                         if ((fn = malloc(sizeof (fsavl_node_t))) == NULL) {
 145                                 fsavl_destroy(fsavl);
 146                                 return (NULL);
 147                         }
 148                         fn->fn_nvfs = nvfs;
 149                         fn->fn_snapname = nvpair_name(snapelem);
 150                         fn->fn_guid = guid;
 151
 152                         /*
 153                          * Note: if there are multiple snaps with the
 154                          * same GUID, we ignore all but one.
 155                          */
 156                         if (avl_find(fsavl, fn, NULL) == NULL)
 157                                 avl_add(fsavl, fn);
 158                         else
 159                                 free(fn);
 160                 }
 161         }
 162
 163         return (fsavl);
 164 }
 165
 166 /*
 167  * Routines for dealing with the giant nvlist of fs-nvlists, etc.
 168  */
 169 typedef struct send_data {
 170         uint64_t parent_fromsnap_guid;
 171         nvlist_t *parent_snaps;
 172         nvlist_t *fss;
 173         nvlist_t *snapprops;
 174         const char *fromsnap;
 175         const char *tosnap;
 176
 177         /*
 178          * The header nvlist is of the following format:
 179          * {
 180          *   "tosnap" -> string
 181          *   "fromsnap" -> string (if incremental)
 182          *   "fss" -> {
 183          *      id -> {
 184          *
 185          *       "name" -> string (full name; for debugging)
 186          *       "parentfromsnap" -> number (guid of fromsnap in parent)
 187          *
 188          *       "props" -> { name -> value (only if set here) }
 189          *       "snaps" -> { name (lastname) -> number (guid) }
 190          *       "snapprops" -> { name (lastname) -> { name -> value } }
 191          *
 192          *       "origin" -> number (guid) (if clone)
 193          *       "sent" -> boolean (not on-disk)
 194          *      }
 195          *   }
 196          * }
 197          *
 198          */
 199 } send_data_t;
 200
 201 static void send_iterate_prop(zfs_handle_t *zhp, nvlist_t *nv);
 202
 203 static int
 204 send_iterate_snap(zfs_handle_t *zhp, void *arg)
 205 {
 206         send_data_t *sd = arg;
 207         uint64_t guid = zhp->zfs_dmustats.dds_guid;
 208         char *snapname;
 209         nvlist_t *nv;
 210
 211         snapname = strrchr(zhp->zfs_name, '@')+1;
 212
 213         VERIFY(0 == nvlist_add_uint64(sd->parent_snaps, snapname, guid));
 214         /*
 215          * NB: if there is no fromsnap here (it's a newly created fs in
 216          * an incremental replication), we will substitute the tosnap.
 217          */
 218         if ((sd->fromsnap && strcmp(snapname, sd->fromsnap) == 0) ||
 219             (sd->parent_fromsnap_guid == 0 && sd->tosnap &&
 220             strcmp(snapname, sd->tosnap) == 0)) {
 221                 sd->parent_fromsnap_guid = guid;
 222         }
 223
 224         VERIFY(0 == nvlist_alloc(&nv, NV_UNIQUE_NAME, 0));
 225         send_iterate_prop(zhp, nv);
 226         VERIFY(0 == nvlist_add_nvlist(sd->snapprops, snapname, nv));
 227         nvlist_free(nv);
 228
 229         zfs_close(zhp);
 230         return (0);
 231 }
 232
 233 static void
 234 send_iterate_prop(zfs_handle_t *zhp, nvlist_t *nv)
 235 {
 236         nvpair_t *elem = NULL;
 237
 238         while ((elem = nvlist_next_nvpair(zhp->zfs_props, elem)) != NULL) {
 239                 char *propname = nvpair_name(elem);
 240                 zfs_prop_t prop = zfs_name_to_prop(propname);
 241                 nvlist_t *propnv;
 242
 243                 assert(zfs_prop_user(propname) || prop != ZPROP_INVAL);
 244
 245                 if (!zfs_prop_user(propname) && zfs_prop_readonly(prop))
 246                         continue;
 247
 248                 verify(nvpair_value_nvlist(elem, &propnv) == 0);
 249                 if (prop == ZFS_PROP_QUOTA || prop == ZFS_PROP_RESERVATION ||
 250                     prop == ZFS_PROP_REFQUOTA ||
 251                     prop == ZFS_PROP_REFRESERVATION) {
 252                         /* these guys are modifyable, but have no source */
 253                         uint64_t value;
 254                         verify(nvlist_lookup_uint64(propnv,
 255                             ZPROP_VALUE, &value) == 0);
 256                         if (zhp->zfs_type == ZFS_TYPE_SNAPSHOT)
 257                                 continue;
 258                 } else {
 259                         char *source;
 260                         if (nvlist_lookup_string(propnv,
 261                             ZPROP_SOURCE, &source) != 0)
 262                                 continue;
 263                         if (strcmp(source, zhp->zfs_name) != 0)
 264                                 continue;
 265                 }
 266
 267                 if (zfs_prop_user(propname) ||
 268                     zfs_prop_get_type(prop) == PROP_TYPE_STRING) {
 269                         char *value;
 270                         verify(nvlist_lookup_string(propnv,
 271                             ZPROP_VALUE, &value) == 0);
 272                         VERIFY(0 == nvlist_add_string(nv, propname, value));
 273                 } else {
 274                         uint64_t value;
 275                         verify(nvlist_lookup_uint64(propnv,
 276                             ZPROP_VALUE, &value) == 0);
 277                         VERIFY(0 == nvlist_add_uint64(nv, propname, value));
 278                 }
 279         }
 280 }
 281
 282 /*
 283  * recursively generate nvlists describing datasets.  See comment
 284  * for the data structure send_data_t above for description of contents
 285  * of the nvlist.
 286  */
 287 static int
 288 send_iterate_fs(zfs_handle_t *zhp, void *arg)
 289 {
 290         send_data_t *sd = arg;
 291         nvlist_t *nvfs, *nv;
 292         int rv;
 293         uint64_t parent_fromsnap_guid_save = sd->parent_fromsnap_guid;
 294         uint64_t guid = zhp->zfs_dmustats.dds_guid;
 295         char guidstring[64];
 296
 297         VERIFY(0 == nvlist_alloc(&nvfs, NV_UNIQUE_NAME, 0));
 298         VERIFY(0 == nvlist_add_string(nvfs, "name", zhp->zfs_name));
 299         VERIFY(0 == nvlist_add_uint64(nvfs, "parentfromsnap",
 300             sd->parent_fromsnap_guid));
 301
 302         if (zhp->zfs_dmustats.dds_origin[0]) {
 303                 zfs_handle_t *origin = zfs_open(zhp->zfs_hdl,
 304                     zhp->zfs_dmustats.dds_origin, ZFS_TYPE_SNAPSHOT);
 305                 if (origin == NULL)
 306                         return (-1);
 307                 VERIFY(0 == nvlist_add_uint64(nvfs, "origin",
 308                     origin->zfs_dmustats.dds_guid));
 309         }
 310
 311         /* iterate over props */
 312         VERIFY(0 == nvlist_alloc(&nv, NV_UNIQUE_NAME, 0));
 313         send_iterate_prop(zhp, nv);
 314         VERIFY(0 == nvlist_add_nvlist(nvfs, "props", nv));
 315         nvlist_free(nv);
 316
 317         /* iterate over snaps, and set sd->parent_fromsnap_guid */
 318         sd->parent_fromsnap_guid = 0;
 319         VERIFY(0 == nvlist_alloc(&sd->parent_snaps, NV_UNIQUE_NAME, 0));
 320         VERIFY(0 == nvlist_alloc(&sd->snapprops, NV_UNIQUE_NAME, 0));
 321         (void) zfs_iter_snapshots(zhp, send_iterate_snap, sd);
 322         VERIFY(0 == nvlist_add_nvlist(nvfs, "snaps", sd->parent_snaps));
 323         VERIFY(0 == nvlist_add_nvlist(nvfs, "snapprops", sd->snapprops));
 324         nvlist_free(sd->parent_snaps);
 325         nvlist_free(sd->snapprops);
 326
 327         /* add this fs to nvlist */
 328         (void) snprintf(guidstring, sizeof (guidstring),
 329             "0x%llx", (longlong_t)guid);
 330         VERIFY(0 == nvlist_add_nvlist(sd->fss, guidstring, nvfs));
 331         nvlist_free(nvfs);
 332
 333         /* iterate over children */
 334         rv = zfs_iter_filesystems(zhp, send_iterate_fs, sd);
 335
 336         sd->parent_fromsnap_guid = parent_fromsnap_guid_save;
 337
 338         zfs_close(zhp);
 339         return (rv);
 340 }
 341
 342 static int
 343 gather_nvlist(libzfs_handle_t *hdl, const char *fsname, const char *fromsnap,
 344     const char *tosnap, nvlist_t **nvlp, avl_tree_t **avlp)
 345 {
 346         zfs_handle_t *zhp;
 347         send_data_t sd = { 0 };
 348         int error;
 349
 350         zhp = zfs_open(hdl, fsname, ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME);
 351         if (zhp == NULL)
 352                 return (EZFS_BADTYPE);
 353
 354         VERIFY(0 == nvlist_alloc(&sd.fss, NV_UNIQUE_NAME, 0));
 355         sd.fromsnap = fromsnap;
 356         sd.tosnap = tosnap;
 357
 358         if ((error = send_iterate_fs(zhp, &sd)) != 0) {
 359                 nvlist_free(sd.fss);
 360                 if (avlp != NULL)
 361                         *avlp = NULL;
 362                 *nvlp = NULL;
 363                 return (error);
 364         }
 365
 366         if (avlp != NULL && (*avlp = fsavl_create(sd.fss)) == NULL) {
 367                 nvlist_free(sd.fss);
 368                 *nvlp = NULL;
 369                 return (EZFS_NOMEM);
 370         }
 371
 372         *nvlp = sd.fss;
 373         return (0);
 374 }
 375
 376 /*
 377  * Routines for dealing with the sorted snapshot functionality
 378  */
 379 typedef struct zfs_node {
 380         zfs_handle_t    *zn_handle;
 381         avl_node_t      zn_avlnode;
 382 } zfs_node_t;
 383
 384 static int
 385 zfs_sort_snaps(zfs_handle_t *zhp, void *data)
 386 {
 387         avl_tree_t *avl = data;
 388         zfs_node_t *node = zfs_alloc(zhp->zfs_hdl, sizeof (zfs_node_t));
 389
 390         node->zn_handle = zhp;
 391         avl_add(avl, node);
 392         return (0);
 393 }
 394
 395 /* ARGSUSED */
 396 static int
 397 zfs_snapshot_compare(const void *larg, const void *rarg)
 398 {
 399         zfs_handle_t *l = ((zfs_node_t *)larg)->zn_handle;
 400         zfs_handle_t *r = ((zfs_node_t *)rarg)->zn_handle;
 401         uint64_t lcreate, rcreate;
 402
 403         /*
 404          * Sort them according to creation time.  We use the hidden
 405          * CREATETXG property to get an absolute ordering of snapshots.
 406          */
 407         lcreate = zfs_prop_get_int(l, ZFS_PROP_CREATETXG);
 408         rcreate = zfs_prop_get_int(r, ZFS_PROP_CREATETXG);
 409
 410         if (lcreate < rcreate)
 411                 return (-1);
 412         else if (lcreate > rcreate)
 413                 return (+1);
 414         else
 415                 return (0);
 416 }
 417
 418 static int
 419 zfs_iter_snapshots_sorted(zfs_handle_t *zhp, zfs_iter_f callback, void *data)
 420 {
 421         int ret = 0;
 422         zfs_node_t *node;
 423         avl_tree_t avl;
 424         void *cookie = NULL;
 425
 426         avl_create(&avl, zfs_snapshot_compare,
 427             sizeof (zfs_node_t), offsetof(zfs_node_t, zn_avlnode));
 428
 429         ret = zfs_iter_snapshots(zhp, zfs_sort_snaps, &avl);
 430
 431         for (node = avl_first(&avl); node != NULL; node = AVL_NEXT(&avl, node))
 432                 ret |= callback(node->zn_handle, data);
 433
 434         while ((node = avl_destroy_nodes(&avl, &cookie)) != NULL)
 435                 free(node);
 436
 437         avl_destroy(&avl);
 438
 439         return (ret);
 440 }
 441
 442 /*
 443  * Routines specific to "zfs send"
 444  */
 445 typedef struct send_dump_data {
 446         /* these are all just the short snapname (the part after the @) */
 447         const char *fromsnap;
 448         const char *tosnap;
 449         char lastsnap[ZFS_MAXNAMELEN];
 450         boolean_t seenfrom, seento, replicate, doall, fromorigin;
 451         boolean_t verbose;
 452         int outfd;
 453         boolean_t err;
 454         nvlist_t *fss;
 455         avl_tree_t *fsavl;
 456 } send_dump_data_t;
 457
 458 /*
 459  * Dumps a backup of the given snapshot (incremental from fromsnap if it's not
 460  * NULL) to the file descriptor specified by outfd.
 461  */
 462 static int
 463 dump_ioctl(zfs_handle_t *zhp, const char *fromsnap, boolean_t fromorigin,
 464     int outfd)
 465 {
 466         zfs_cmd_t zc = { 0 };
 467         libzfs_handle_t *hdl = zhp->zfs_hdl;
 468
 469         assert(zhp->zfs_type == ZFS_TYPE_SNAPSHOT);
 470         assert(fromsnap == NULL || fromsnap[0] == '\0' || !fromorigin);
 471
 472         (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
 473         if (fromsnap)
 474                 (void) strlcpy(zc.zc_value, fromsnap, sizeof (zc.zc_value));
 475         zc.zc_cookie = outfd;
 476         zc.zc_obj = fromorigin;
 477
 478         if (ioctl(zhp->zfs_hdl->libzfs_fd, ZFS_IOC_SEND, &zc) != 0) {
 479                 char errbuf[1024];
 480                 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
 481                     "warning: cannot send '%s'"), zhp->zfs_name);
 482
 483                 switch (errno) {
 484
 485                 case EXDEV:
 486                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
 487                             "not an earlier snapshot from the same fs"));
 488                         return (zfs_error(hdl, EZFS_CROSSTARGET, errbuf));
 489
 490                 case ENOENT:
 491                         if (zfs_dataset_exists(hdl, zc.zc_name,
 492                             ZFS_TYPE_SNAPSHOT)) {
 493                                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
 494                                     "incremental source (@%s) does not exist"),
 495                                     zc.zc_value);
 496                         }
 497                         return (zfs_error(hdl, EZFS_NOENT, errbuf));
 498
 499                 case EDQUOT:
 500                 case EFBIG:
 501                 case EIO:
 502                 case ENOLINK:
 503                 case ENOSPC:
 504                 case ENOSTR:
 505                 case ENXIO:
 506                 case EPIPE:
 507                 case ERANGE:
 508                 case EFAULT:
 509                 case EROFS:
 510                         zfs_error_aux(hdl, strerror(errno));
 511                         return (zfs_error(hdl, EZFS_BADBACKUP, errbuf));
 512
 513                 default:
 514                         return (zfs_standard_error(hdl, errno, errbuf));
 515                 }
 516         }
 517
 518         return (0);
 519 }
 520
 521 static int
 522 dump_snapshot(zfs_handle_t *zhp, void *arg)
 523 {
 524         send_dump_data_t *sdd = arg;
 525         const char *thissnap;
 526         int err;
 527
 528         thissnap = strchr(zhp->zfs_name, '@') + 1;
 529
 530         if (sdd->fromsnap && !sdd->seenfrom &&
 531             strcmp(sdd->fromsnap, thissnap) == 0) {
 532                 sdd->seenfrom = B_TRUE;
 533                 (void) strcpy(sdd->lastsnap, thissnap);
 534                 zfs_close(zhp);
 535                 return (0);
 536         }
 537
 538         if (sdd->seento || !sdd->seenfrom) {
 539                 zfs_close(zhp);
 540                 return (0);
 541         }
 542
 543         /* send it */
 544         if (sdd->verbose) {
 545                 (void) fprintf(stderr, "sending from @%s to %s\n",
 546                     sdd->lastsnap, zhp->zfs_name);
 547         }
 548
 549         err = dump_ioctl(zhp, sdd->lastsnap,
 550             sdd->lastsnap[0] == '\0' && (sdd->fromorigin || sdd->replicate),
 551             sdd->outfd);
 552
 553         if (!sdd->seento && strcmp(sdd->tosnap, thissnap) == 0)
 554                 sdd->seento = B_TRUE;
 555
 556         (void) strcpy(sdd->lastsnap, thissnap);
 557         zfs_close(zhp);
 558         return (err);
 559 }
 560
 561 static int
 562 dump_filesystem(zfs_handle_t *zhp, void *arg)
 563 {
 564         int rv = 0;
 565         send_dump_data_t *sdd = arg;
 566         boolean_t missingfrom = B_FALSE;
 567         zfs_cmd_t zc = { 0 };
 568
 569         (void) snprintf(zc.zc_name, sizeof (zc.zc_name), "%s@%s",
 570             zhp->zfs_name, sdd->tosnap);
 571         if (ioctl(zhp->zfs_hdl->libzfs_fd, ZFS_IOC_OBJSET_STATS, &zc) != 0) {
 572                 (void) fprintf(stderr, "WARNING: "
 573                     "could not send %s@%s: does not exist\n",
 574                     zhp->zfs_name, sdd->tosnap);
 575                 sdd->err = B_TRUE;
 576                 return (0);
 577         }
 578
 579         if (sdd->replicate && sdd->fromsnap) {
 580                 /*
 581                  * If this fs does not have fromsnap, and we're doing
 582                  * recursive, we need to send a full stream from the
 583                  * beginning (or an incremental from the origin if this
 584                  * is a clone).  If we're doing non-recursive, then let
 585                  * them get the error.
 586                  */
 587                 (void) snprintf(zc.zc_name, sizeof (zc.zc_name), "%s@%s",
 588                     zhp->zfs_name, sdd->fromsnap);
 589                 if (ioctl(zhp->zfs_hdl->libzfs_fd,
 590                     ZFS_IOC_OBJSET_STATS, &zc) != 0) {
 591                         missingfrom = B_TRUE;
 592                 }
 593         }
 594
 595         if (sdd->doall) {
 596                 sdd->seenfrom = sdd->seento = sdd->lastsnap[0] = 0;
 597                 if (sdd->fromsnap == NULL || missingfrom)
 598                         sdd->seenfrom = B_TRUE;
 599
 600                 rv = zfs_iter_snapshots_sorted(zhp, dump_snapshot, arg);
 601                 if (!sdd->seenfrom) {
 602                         (void) fprintf(stderr,
 603                             "WARNING: could not send %s@%s:\n"
 604                             "incremental source (%s@%s) does not exist\n",
 605                             zhp->zfs_name, sdd->tosnap,
 606                             zhp->zfs_name, sdd->fromsnap);
 607                         sdd->err = B_TRUE;
 608                 } else if (!sdd->seento) {
 609                         if (sdd->fromsnap) {
 610                                 (void) fprintf(stderr,
 611                                     "WARNING: could not send %s@%s:\n"
 612                                     "incremental source (%s@%s) "
 613                                     "is not earlier than it\n",
 614                                     zhp->zfs_name, sdd->tosnap,
 615                                     zhp->zfs_name, sdd->fromsnap);
 616                         } else {
 617                                 (void) fprintf(stderr, "WARNING: "
 618                                     "could not send %s@%s: does not exist\n",
 619                                     zhp->zfs_name, sdd->tosnap);
 620                         }
 621                         sdd->err = B_TRUE;
 622                 }
 623         } else {
 624                 zfs_handle_t *snapzhp;
 625                 char snapname[ZFS_MAXNAMELEN];
 626
 627                 (void) snprintf(snapname, sizeof (snapname), "%s@%s",
 628                     zfs_get_name(zhp), sdd->tosnap);
 629                 snapzhp = zfs_open(zhp->zfs_hdl, snapname, ZFS_TYPE_SNAPSHOT);
 630                 if (snapzhp == NULL) {
 631                         rv = -1;
 632                 } else {
 633                         rv = dump_ioctl(snapzhp,
 634                             missingfrom ? NULL : sdd->fromsnap,
 635                             sdd->fromorigin || missingfrom,
 636                             sdd->outfd);
 637                         sdd->seento = B_TRUE;
 638                         zfs_close(snapzhp);
 639                 }
 640         }
 641
 642         return (rv);
 643 }
 644
 645 static int
 646 dump_filesystems(zfs_handle_t *rzhp, void *arg)
 647 {
 648         send_dump_data_t *sdd = arg;
 649         nvpair_t *fspair;
 650         boolean_t needagain, progress;
 651
 652         if (!sdd->replicate)
 653                 return (dump_filesystem(rzhp, sdd));
 654
 655 again:
 656         needagain = progress = B_FALSE;
 657         for (fspair = nvlist_next_nvpair(sdd->fss, NULL); fspair;
 658             fspair = nvlist_next_nvpair(sdd->fss, fspair)) {
 659                 nvlist_t *fslist;
 660                 char *fsname;
 661                 zfs_handle_t *zhp;
 662                 int err;
 663                 uint64_t origin_guid = 0;
 664                 nvlist_t *origin_nv;
 665
 666                 VERIFY(nvpair_value_nvlist(fspair, &fslist) == 0);
 667                 if (nvlist_lookup_boolean(fslist, "sent") == 0)
 668                         continue;
 669
 670                 VERIFY(nvlist_lookup_string(fslist, "name", &fsname) == 0);
 671                 (void) nvlist_lookup_uint64(fslist, "origin", &origin_guid);
 672
 673                 origin_nv = fsavl_find(sdd->fsavl, origin_guid, NULL);
 674                 if (origin_nv &&
 675                     nvlist_lookup_boolean(origin_nv, "sent") == ENOENT) {
 676                         /*
 677                          * origin has not been sent yet;
 678                          * skip this clone.
 679                          */
 680                         needagain = B_TRUE;
 681                         continue;
 682                 }
 683
 684                 zhp = zfs_open(rzhp->zfs_hdl, fsname, ZFS_TYPE_DATASET);
 685                 if (zhp == NULL)
 686                         return (-1);
 687                 err = dump_filesystem(zhp, sdd);
 688                 VERIFY(nvlist_add_boolean(fslist, "sent") == 0);
 689                 progress = B_TRUE;
 690                 zfs_close(zhp);
 691                 if (err)
 692                         return (err);
 693         }
 694         if (needagain) {
 695                 assert(progress);
 696                 goto again;
 697         }
 698         return (0);
 699 }
 700
 701 /*
 702  * Generate a send stream for the dataset identified by the argument zhp.
 703  *
 704  * The content of the send stream is the snapshot identified by
 705  * 'tosnap'.  Incremental streams are requested in two ways:
 706  *     - from the snapshot identified by "fromsnap" (if non-null) or
 707  *     - from the origin of the dataset identified by zhp, which must
 708  *       be a clone.  In this case, "fromsnap" is null and "fromorigin"
 709  *       is TRUE.
 710  *
 711  * The send stream is recursive (i.e. dumps a hierarchy of snapshots) and
 712  * uses a special header (with a version field of DMU_BACKUP_HEADER_VERSION)
 713  * if "replicate" is set.  If "doall" is set, dump all the intermediate
 714  * snapshots. The DMU_BACKUP_HEADER_VERSION header is used in the "doall"
 715  * case too.
 716  */
 717 int
 718 zfs_send(zfs_handle_t *zhp, const char *fromsnap, const char *tosnap,
 719     boolean_t replicate, boolean_t doall, boolean_t fromorigin,
 720     boolean_t verbose, int outfd)
 721 {
 722         char errbuf[1024];
 723         send_dump_data_t sdd = { 0 };
 724         int err;
 725         nvlist_t *fss = NULL;
 726         avl_tree_t *fsavl = NULL;
 727
 728         (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
 729             "cannot send '%s'"), zhp->zfs_name);
 730
 731         if (fromsnap && fromsnap[0] == '\0') {
 732                 zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN,
 733                     "zero-length incremental source"));
 734                 return (zfs_error(zhp->zfs_hdl, EZFS_NOENT, errbuf));
 735         }
 736
 737         if (replicate || doall) {
 738                 dmu_replay_record_t drr = { 0 };
 739                 char *packbuf = NULL;
 740                 size_t buflen = 0;
 741                 zio_cksum_t zc = { 0 };
 742
 743                 assert(fromsnap || doall);
 744
 745                 if (replicate) {
 746                         nvlist_t *hdrnv;
 747
 748                         VERIFY(0 == nvlist_alloc(&hdrnv, NV_UNIQUE_NAME, 0));
 749                         if (fromsnap) {
 750                                 VERIFY(0 == nvlist_add_string(hdrnv,
 751                                     "fromsnap", fromsnap));
 752                         }
 753                         VERIFY(0 == nvlist_add_string(hdrnv, "tosnap", tosnap));
 754
 755                         err = gather_nvlist(zhp->zfs_hdl, zhp->zfs_name,
 756                             fromsnap, tosnap, &fss, &fsavl);
 757                         if (err)
 758                                 return (err);
 759                         VERIFY(0 == nvlist_add_nvlist(hdrnv, "fss", fss));
 760                         err = nvlist_pack(hdrnv, &packbuf, &buflen,
 761                             NV_ENCODE_XDR, 0);
 762                         nvlist_free(hdrnv);
 763                         if (err) {
 764                                 fsavl_destroy(fsavl);
 765                                 nvlist_free(fss);
 766                                 return (zfs_standard_error(zhp->zfs_hdl,
 767                                     err, errbuf));
 768                         }
 769                 }
 770
 771                 /* write first begin record */
 772                 drr.drr_type = DRR_BEGIN;
 773                 drr.drr_u.drr_begin.drr_magic = DMU_BACKUP_MAGIC;
 774                 drr.drr_u.drr_begin.drr_version = DMU_BACKUP_HEADER_VERSION;
 775                 (void) snprintf(drr.drr_u.drr_begin.drr_toname,
 776                     sizeof (drr.drr_u.drr_begin.drr_toname),
 777                     "%s@%s", zhp->zfs_name, tosnap);
 778                 drr.drr_payloadlen = buflen;
 779                 fletcher_4_incremental_native(&drr, sizeof (drr), &zc);
 780                 err = write(outfd, &drr, sizeof (drr));
 781
 782                 /* write header nvlist */
 783                 if (err != -1) {
 784                         fletcher_4_incremental_native(packbuf, buflen, &zc);
 785                         err = write(outfd, packbuf, buflen);
 786                 }
 787                 free(packbuf);
 788                 if (err == -1) {
 789                         fsavl_destroy(fsavl);
 790                         nvlist_free(fss);
 791                         return (zfs_standard_error(zhp->zfs_hdl,
 792                             errno, errbuf));
 793                 }
 794
 795                 /* write end record */
 796                 if (err != -1) {
 797                         bzero(&drr, sizeof (drr));
 798                         drr.drr_type = DRR_END;
 799                         drr.drr_u.drr_end.drr_checksum = zc;
 800                         err = write(outfd, &drr, sizeof (drr));
 801                         if (err == -1) {
 802                                 fsavl_destroy(fsavl);
 803                                 nvlist_free(fss);
 804                                 return (zfs_standard_error(zhp->zfs_hdl,
 805                                     errno, errbuf));
 806                         }
 807                 }
 808         }
 809
 810         /* dump each stream */
 811         sdd.fromsnap = fromsnap;
 812         sdd.tosnap = tosnap;
 813         sdd.outfd = outfd;
 814         sdd.replicate = replicate;
 815         sdd.doall = doall;
 816         sdd.fromorigin = fromorigin;
 817         sdd.fss = fss;
 818         sdd.fsavl = fsavl;
 819         sdd.verbose = verbose;
 820         err = dump_filesystems(zhp, &sdd);
 821         fsavl_destroy(fsavl);
 822         nvlist_free(fss);
 823
 824         if (replicate || doall) {
 825                 /*
 826                  * write final end record.  NB: want to do this even if
 827                  * there was some error, because it might not be totally
 828                  * failed.
 829                  */
 830                 dmu_replay_record_t drr = { 0 };
 831                 drr.drr_type = DRR_END;
 832                 if (write(outfd, &drr, sizeof (drr)) == -1) {
 833                         return (zfs_standard_error(zhp->zfs_hdl,
 834                             errno, errbuf));
 835                 }
 836         }
 837
 838         return (err || sdd.err);
 839 }
 840
 841 /*
 842  * Routines specific to "zfs recv"
 843  */
 844
 845 static int
 846 recv_read(libzfs_handle_t *hdl, int fd, void *buf, int ilen,
 847     boolean_t byteswap, zio_cksum_t *zc)
 848 {
 849         char *cp = buf;
 850         int rv;
 851         int len = ilen;
 852
 853         do {
 854                 rv = read(fd, cp, len);
 855                 cp += rv;
 856                 len -= rv;
 857         } while (rv > 0);
 858
 859         if (rv < 0 || len != 0) {
 860                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
 861                     "failed to read from stream"));
 862                 return (zfs_error(hdl, EZFS_BADSTREAM, dgettext(TEXT_DOMAIN,
 863                     "cannot receive")));
 864         }
 865
 866         if (zc) {
 867                 if (byteswap)
 868                         fletcher_4_incremental_byteswap(buf, ilen, zc);
 869                 else
 870                         fletcher_4_incremental_native(buf, ilen, zc);
 871         }
 872         return (0);
 873 }
 874
 875 static int
 876 recv_read_nvlist(libzfs_handle_t *hdl, int fd, int len, nvlist_t **nvp,
 877     boolean_t byteswap, zio_cksum_t *zc)
 878 {
 879         char *buf;
 880         int err;
 881
 882         buf = zfs_alloc(hdl, len);
 883         if (buf == NULL)
 884                 return (ENOMEM);
 885
 886         err = recv_read(hdl, fd, buf, len, byteswap, zc);
 887         if (err != 0) {
 888                 free(buf);
 889                 return (err);
 890         }
 891
 892         err = nvlist_unpack(buf, len, nvp, 0);
 893         free(buf);
 894         if (err != 0) {
 895                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "invalid "
 896                     "stream (malformed nvlist)"));
 897                 return (EINVAL);
 898         }
 899         return (0);
 900 }
 901
 902 static int
 903 recv_rename(libzfs_handle_t *hdl, const char *name, const char *tryname,
 904     int baselen, char *newname, recvflags_t flags)
 905 {
 906         static int seq;
 907         zfs_cmd_t zc = { 0 };
 908         int err;
 909         prop_changelist_t *clp;
 910         zfs_handle_t *zhp;
 911
 912         zhp = zfs_open(hdl, name, ZFS_TYPE_DATASET);
 913         if (zhp == NULL)
 914                 return (-1);
 915         clp = changelist_gather(zhp, ZFS_PROP_NAME, 0,
 916             flags.force ? MS_FORCE : 0);
 917         zfs_close(zhp);
 918         if (clp == NULL)
 919                 return (-1);
 920         err = changelist_prefix(clp);
 921         if (err)
 922                 return (err);
 923
 924         zc.zc_objset_type = DMU_OST_ZFS;
 925         (void) strlcpy(zc.zc_name, name, sizeof (zc.zc_name));
 926
 927         if (tryname) {
 928                 (void) strcpy(newname, tryname);
 929
 930                 (void) strlcpy(zc.zc_value, tryname, sizeof (zc.zc_value));
 931
 932                 if (flags.verbose) {
 933                         (void) printf("attempting rename %s to %s\n",
 934                             zc.zc_name, zc.zc_value);
 935                 }
 936                 err = ioctl(hdl->libzfs_fd, ZFS_IOC_RENAME, &zc);
 937                 if (err == 0)
 938                         changelist_rename(clp, name, tryname);
 939         } else {
 940                 err = ENOENT;
 941         }
 942
 943         if (err != 0 && strncmp(name+baselen, "recv-", 5) != 0) {
 944                 seq++;
 945
 946                 (void) strncpy(newname, name, baselen);
 947                 (void) snprintf(newname+baselen, ZFS_MAXNAMELEN-baselen,
 948                     "recv-%u-%u", getpid(), seq);
 949                 (void) strlcpy(zc.zc_value, newname, sizeof (zc.zc_value));
 950
 951                 if (flags.verbose) {
 952                         (void) printf("failed - trying rename %s to %s\n",
 953                             zc.zc_name, zc.zc_value);
 954                 }
 955                 err = ioctl(hdl->libzfs_fd, ZFS_IOC_RENAME, &zc);
 956                 if (err == 0)
 957                         changelist_rename(clp, name, newname);
 958                 if (err && flags.verbose) {
 959                         (void) printf("failed (%u) - "
 960                             "will try again on next pass\n", errno);
 961                 }
 962                 err = EAGAIN;
 963         } else if (flags.verbose) {
 964                 if (err == 0)
 965                         (void) printf("success\n");
 966                 else
 967                         (void) printf("failed (%u)\n", errno);
 968         }
 969
 970         (void) changelist_postfix(clp);
 971         changelist_free(clp);
 972
 973         return (err);
 974 }
 975
 976 static int
 977 recv_destroy(libzfs_handle_t *hdl, const char *name, int baselen,
 978     char *newname, recvflags_t flags)
 979 {
 980         zfs_cmd_t zc = { 0 };
 981         int err = 0;
 982         prop_changelist_t *clp;
 983         zfs_handle_t *zhp;
 984         boolean_t defer = B_FALSE;
 985         int spa_version;
 986
 987         zhp = zfs_open(hdl, name, ZFS_TYPE_DATASET);
 988         if (zhp == NULL)
 989                 return (-1);
 990         clp = changelist_gather(zhp, ZFS_PROP_NAME, 0,
 991             flags.force ? MS_FORCE : 0);
 992         if (zfs_get_type(zhp) == ZFS_TYPE_SNAPSHOT &&
 993             zfs_spa_version(zhp, &spa_version) == 0 &&
 994             spa_version >= SPA_VERSION_USERREFS)
 995                 defer = B_TRUE;
 996         zfs_close(zhp);
 997         if (clp == NULL)
 998                 return (-1);
 999         err = changelist_prefix(clp);
1000         if (err)
1001                 return (err);
1002
1003         zc.zc_objset_type = DMU_OST_ZFS;
1004         zc.zc_defer_destroy = defer;
1005         (void) strlcpy(zc.zc_name, name, sizeof (zc.zc_name));
1006
1007         if (flags.verbose)
1008                 (void) printf("attempting destroy %s\n", zc.zc_name);
1009         err = ioctl(hdl->libzfs_fd, ZFS_IOC_DESTROY, &zc);
1010         if (err == 0) {
1011                 if (flags.verbose)
1012                         (void) printf("success\n");
1013                 changelist_remove(clp, zc.zc_name);
1014         }
1015
1016         (void) changelist_postfix(clp);
1017         changelist_free(clp);
1018
1019         /*
1020          * Deferred destroy should always succeed. Since we can't tell
1021          * if it destroyed the dataset or just marked it for deferred
1022          * destroy, always do the rename just in case.
1023          */
1024         if (err != 0 || defer)
1025                 err = recv_rename(hdl, name, NULL, baselen, newname, flags);
1026
1027         return (err);
1028 }
1029
1030 typedef struct guid_to_name_data {
1031         uint64_t guid;
1032         char *name;
1033 } guid_to_name_data_t;
1034
1035 static int
1036 guid_to_name_cb(zfs_handle_t *zhp, void *arg)
1037 {
1038         guid_to_name_data_t *gtnd = arg;
1039         int err;
1040
1041         if (zhp->zfs_dmustats.dds_guid == gtnd->guid) {
1042                 (void) strcpy(gtnd->name, zhp->zfs_name);
1043                 return (EEXIST);
1044         }
1045         err = zfs_iter_children(zhp, guid_to_name_cb, gtnd);
1046         zfs_close(zhp);
1047         return (err);
1048 }
1049
1050 static int
1051 guid_to_name(libzfs_handle_t *hdl, const char *parent, uint64_t guid,
1052     char *name)
1053 {
1054         /* exhaustive search all local snapshots */
1055         guid_to_name_data_t gtnd;
1056         int err = 0;
1057         zfs_handle_t *zhp;
1058         char *cp;
1059
1060         gtnd.guid = guid;
1061         gtnd.name = name;
1062
1063         if (strchr(parent, '@') == NULL) {
1064                 zhp = make_dataset_handle(hdl, parent);
1065                 if (zhp != NULL) {
1066                         err = zfs_iter_children(zhp, guid_to_name_cb, &gtnd);
1067                         zfs_close(zhp);
1068                         if (err == EEXIST)
1069                                 return (0);
1070                 }
1071         }
1072
1073         cp = strchr(parent, '/');
1074         if (cp)
1075                 *cp = '\0';
1076         zhp = make_dataset_handle(hdl, parent);
1077         if (cp)
1078                 *cp = '/';
1079
1080         if (zhp) {
1081                 err = zfs_iter_children(zhp, guid_to_name_cb, &gtnd);
1082                 zfs_close(zhp);
1083         }
1084
1085         return (err == EEXIST ? 0 : ENOENT);
1086
1087 }
1088
1089 /*
1090  * Return true if dataset guid1 is created before guid2.
1091  */
1092 static int
1093 created_before(libzfs_handle_t *hdl, avl_tree_t *avl,
1094     uint64_t guid1, uint64_t guid2)
1095 {
1096         nvlist_t *nvfs;
1097         char *fsname, *snapname;
1098         char buf[ZFS_MAXNAMELEN];
1099         int rv;
1100         zfs_node_t zn1, zn2;
1101
1102         if (guid2 == 0)
1103                 return (0);
1104         if (guid1 == 0)
1105                 return (1);
1106
1107         nvfs = fsavl_find(avl, guid1, &snapname);
1108         VERIFY(0 == nvlist_lookup_string(nvfs, "name", &fsname));
1109         (void) snprintf(buf, sizeof (buf), "%s@%s", fsname, snapname);
1110         zn1.zn_handle = zfs_open(hdl, buf, ZFS_TYPE_SNAPSHOT);
1111         if (zn1.zn_handle == NULL)
1112                 return (-1);
1113
1114         nvfs = fsavl_find(avl, guid2, &snapname);
1115         VERIFY(0 == nvlist_lookup_string(nvfs, "name", &fsname));
1116         (void) snprintf(buf, sizeof (buf), "%s@%s", fsname, snapname);
1117         zn2.zn_handle = zfs_open(hdl, buf, ZFS_TYPE_SNAPSHOT);
1118         if (zn2.zn_handle == NULL) {
1119                 zfs_close(zn2.zn_handle);
1120                 return (-1);
1121         }
1122
1123         rv = (zfs_snapshot_compare(&zn1, &zn2) == -1);
1124
1125         zfs_close(zn1.zn_handle);
1126         zfs_close(zn2.zn_handle);
1127
1128         return (rv);
1129 }
1130
1131 static int
1132 recv_incremental_replication(libzfs_handle_t *hdl, const char *tofs,
1133     recvflags_t flags, nvlist_t *stream_nv, avl_tree_t *stream_avl)
1134 {
1135         nvlist_t *local_nv;
1136         avl_tree_t *local_avl;
1137         nvpair_t *fselem, *nextfselem;
1138         char *tosnap, *fromsnap;
1139         char newname[ZFS_MAXNAMELEN];
1140         int error;
1141         boolean_t needagain, progress;
1142
1143         VERIFY(0 == nvlist_lookup_string(stream_nv, "fromsnap", &fromsnap));
1144         VERIFY(0 == nvlist_lookup_string(stream_nv, "tosnap", &tosnap));
1145
1146         if (flags.dryrun)
1147                 return (0);
1148
1149 again:
1150         needagain = progress = B_FALSE;
1151
1152         if ((error = gather_nvlist(hdl, tofs, fromsnap, NULL,
1153             &local_nv, &local_avl)) != 0)
1154                 return (error);
1155
1156         /*
1157          * Process deletes and renames
1158          */
1159         for (fselem = nvlist_next_nvpair(local_nv, NULL);
1160             fselem; fselem = nextfselem) {
1161                 nvlist_t *nvfs, *snaps;
1162                 nvlist_t *stream_nvfs = NULL;
1163                 nvpair_t *snapelem, *nextsnapelem;
1164                 uint64_t fromguid = 0;
1165                 uint64_t originguid = 0;
1166                 uint64_t stream_originguid = 0;
1167                 uint64_t parent_fromsnap_guid, stream_parent_fromsnap_guid;
1168                 char *fsname, *stream_fsname;
1169
1170                 nextfselem = nvlist_next_nvpair(local_nv, fselem);
1171
1172                 VERIFY(0 == nvpair_value_nvlist(fselem, &nvfs));
1173                 VERIFY(0 == nvlist_lookup_nvlist(nvfs, "snaps", &snaps));
1174                 VERIFY(0 == nvlist_lookup_string(nvfs, "name", &fsname));
1175                 VERIFY(0 == nvlist_lookup_uint64(nvfs, "parentfromsnap",
1176                     &parent_fromsnap_guid));
1177                 (void) nvlist_lookup_uint64(nvfs, "origin", &originguid);
1178
1179                 /*
1180                  * First find the stream's fs, so we can check for
1181                  * a different origin (due to "zfs promote")
1182                  */
1183                 for (snapelem = nvlist_next_nvpair(snaps, NULL);
1184                     snapelem; snapelem = nvlist_next_nvpair(snaps, snapelem)) {
1185                         uint64_t thisguid;
1186
1187                         VERIFY(0 == nvpair_value_uint64(snapelem, &thisguid));
1188                         stream_nvfs = fsavl_find(stream_avl, thisguid, NULL);
1189
1190                         if (stream_nvfs != NULL)
1191                                 break;
1192                 }
1193
1194                 /* check for promote */
1195                 (void) nvlist_lookup_uint64(stream_nvfs, "origin",
1196                     &stream_originguid);
1197                 if (stream_nvfs && originguid != stream_originguid) {
1198                         switch (created_before(hdl, local_avl,
1199                             stream_originguid, originguid)) {
1200                         case 1: {
1201                                 /* promote it! */
1202                                 zfs_cmd_t zc = { 0 };
1203                                 nvlist_t *origin_nvfs;
1204                                 char *origin_fsname;
1205
1206                                 if (flags.verbose)
1207                                         (void) printf("promoting %s\n", fsname);
1208
1209                                 origin_nvfs = fsavl_find(local_avl, originguid,
1210                                     NULL);
1211                                 VERIFY(0 == nvlist_lookup_string(origin_nvfs,
1212                                     "name", &origin_fsname));
1213                                 (void) strlcpy(zc.zc_value, origin_fsname,
1214                                     sizeof (zc.zc_value));
1215                                 (void) strlcpy(zc.zc_name, fsname,
1216                                     sizeof (zc.zc_name));
1217                                 error = zfs_ioctl(hdl, ZFS_IOC_PROMOTE, &zc);
1218                                 if (error == 0)
1219                                         progress = B_TRUE;
1220                                 break;
1221                         }
1222                         default:
1223                                 break;
1224                         case -1:
1225                                 fsavl_destroy(local_avl);
1226                                 nvlist_free(local_nv);
1227                                 return (-1);
1228                         }
1229                         /*
1230                          * We had/have the wrong origin, therefore our
1231                          * list of snapshots is wrong.  Need to handle
1232                          * them on the next pass.
1233                          */
1234                         needagain = B_TRUE;
1235                         continue;
1236                 }
1237
1238                 for (snapelem = nvlist_next_nvpair(snaps, NULL);
1239                     snapelem; snapelem = nextsnapelem) {
1240                         uint64_t thisguid;
1241                         char *stream_snapname;
1242                         nvlist_t *found, *props;
1243
1244                         nextsnapelem = nvlist_next_nvpair(snaps, snapelem);
1245
1246                         VERIFY(0 == nvpair_value_uint64(snapelem, &thisguid));
1247                         found = fsavl_find(stream_avl, thisguid,
1248                             &stream_snapname);
1249
1250                         /* check for delete */
1251                         if (found == NULL) {
1252                                 char name[ZFS_MAXNAMELEN];
1253
1254                                 if (!flags.force)
1255                                         continue;
1256
1257                                 (void) snprintf(name, sizeof (name), "%s@%s",
1258                                     fsname, nvpair_name(snapelem));
1259
1260                                 error = recv_destroy(hdl, name,
1261                                     strlen(fsname)+1, newname, flags);
1262                                 if (error)
1263                                         needagain = B_TRUE;
1264                                 else
1265                                         progress = B_TRUE;
1266                                 continue;
1267                         }
1268
1269                         stream_nvfs = found;
1270
1271                         if (0 == nvlist_lookup_nvlist(stream_nvfs, "snapprops",
1272                             &props) && 0 == nvlist_lookup_nvlist(props,
1273                             stream_snapname, &props)) {
1274                                 zfs_cmd_t zc = { 0 };
1275
1276                                 zc.zc_cookie = B_TRUE; /* clear current props */
1277                                 (void) snprintf(zc.zc_name, sizeof (zc.zc_name),
1278                                     "%s@%s", fsname, nvpair_name(snapelem));
1279                                 if (zcmd_write_src_nvlist(hdl, &zc,
1280                                     props) == 0) {
1281                                         (void) zfs_ioctl(hdl,
1282                                             ZFS_IOC_SET_PROP, &zc);
1283                                         zcmd_free_nvlists(&zc);
1284                                 }
1285                         }
1286
1287                         /* check for different snapname */
1288                         if (strcmp(nvpair_name(snapelem),
1289                             stream_snapname) != 0) {
1290                                 char name[ZFS_MAXNAMELEN];
1291                                 char tryname[ZFS_MAXNAMELEN];
1292
1293                                 (void) snprintf(name, sizeof (name), "%s@%s",
1294                                     fsname, nvpair_name(snapelem));
1295                                 (void) snprintf(tryname, sizeof (name), "%s@%s",
1296                                     fsname, stream_snapname);
1297
1298                                 error = recv_rename(hdl, name, tryname,
1299                                     strlen(fsname)+1, newname, flags);
1300                                 if (error)
1301                                         needagain = B_TRUE;
1302                                 else
1303                                         progress = B_TRUE;
1304                         }
1305
1306                         if (strcmp(stream_snapname, fromsnap) == 0)
1307                                 fromguid = thisguid;
1308                 }
1309
1310                 /* check for delete */
1311                 if (stream_nvfs == NULL) {
1312                         if (!flags.force)
1313                                 continue;
1314
1315                         error = recv_destroy(hdl, fsname, strlen(tofs)+1,
1316                             newname, flags);
1317                         if (error)
1318                                 needagain = B_TRUE;
1319                         else
1320                                 progress = B_TRUE;
1321                         continue;
1322                 }
1323
1324                 if (fromguid == 0 && flags.verbose) {
1325                         (void) printf("local fs %s does not have fromsnap "
1326                             "(%s in stream); must have been deleted locally; "
1327                             "ignoring\n", fsname, fromsnap);
1328                         continue;
1329                 }
1330
1331                 VERIFY(0 == nvlist_lookup_string(stream_nvfs,
1332                     "name", &stream_fsname));
1333                 VERIFY(0 == nvlist_lookup_uint64(stream_nvfs,
1334                     "parentfromsnap", &stream_parent_fromsnap_guid));
1335
1336                 /* check for rename */
1337                 if ((stream_parent_fromsnap_guid != 0 &&
1338                     stream_parent_fromsnap_guid != parent_fromsnap_guid) ||
1339                     strcmp(strrchr(fsname, '/'),
1340                     strrchr(stream_fsname, '/')) != 0) {
1341                         nvlist_t *parent;
1342                         char tryname[ZFS_MAXNAMELEN];
1343
1344                         parent = fsavl_find(local_avl,
1345                             stream_parent_fromsnap_guid, NULL);
1346                         /*
1347                          * NB: parent might not be found if we used the
1348                          * tosnap for stream_parent_fromsnap_guid,
1349                          * because the parent is a newly-created fs;
1350                          * we'll be able to rename it after we recv the
1351                          * new fs.
1352                          */
1353                         if (parent != NULL) {
1354                                 char *pname;
1355
1356                                 VERIFY(0 == nvlist_lookup_string(parent, "name",
1357                                     &pname));
1358                                 (void) snprintf(tryname, sizeof (tryname),
1359                                     "%s%s", pname, strrchr(stream_fsname, '/'));
1360                         } else {
1361                                 tryname[0] = '\0';
1362                                 if (flags.verbose) {
1363                                         (void) printf("local fs %s new parent "
1364                                             "not found\n", fsname);
1365                                 }
1366                         }
1367
1368                         error = recv_rename(hdl, fsname, tryname,
1369                             strlen(tofs)+1, newname, flags);
1370                         if (error)
1371                                 needagain = B_TRUE;
1372                         else
1373                                 progress = B_TRUE;
1374                 }
1375         }
1376
1377         fsavl_destroy(local_avl);
1378         nvlist_free(local_nv);
1379
1380         if (needagain && progress) {
1381                 /* do another pass to fix up temporary names */
1382                 if (flags.verbose)
1383                         (void) printf("another pass:\n");
1384                 goto again;
1385         }
1386
1387         return (needagain);
1388 }
1389
1390 static int
1391 zfs_receive_package(libzfs_handle_t *hdl, int fd, const char *destname,
1392     recvflags_t flags, dmu_replay_record_t *drr, zio_cksum_t *zc,
1393     char **top_zfs)
1394 {
1395         nvlist_t *stream_nv = NULL;
1396         avl_tree_t *stream_avl = NULL;
1397         char *fromsnap = NULL;
1398         char tofs[ZFS_MAXNAMELEN];
1399         char errbuf[1024];
1400         dmu_replay_record_t drre;
1401         int error;
1402         boolean_t anyerr = B_FALSE;
1403         boolean_t softerr = B_FALSE;
1404
1405         (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
1406             "cannot receive"));
1407
1408         if (strchr(destname, '@')) {
1409                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1410                     "can not specify snapshot name for multi-snapshot stream"));
1411                 return (zfs_error(hdl, EZFS_BADSTREAM, errbuf));
1412         }
1413
1414         assert(drr->drr_type == DRR_BEGIN);
1415         assert(drr->drr_u.drr_begin.drr_magic == DMU_BACKUP_MAGIC);
1416         assert(drr->drr_u.drr_begin.drr_version == DMU_BACKUP_HEADER_VERSION);
1417
1418         /*
1419          * Read in the nvlist from the stream.
1420          */
1421         if (drr->drr_payloadlen != 0) {
1422                 if (!flags.isprefix) {
1423                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1424                             "must use -d to receive replication "
1425                             "(send -R) stream"));
1426                         return (zfs_error(hdl, EZFS_BADSTREAM, errbuf));
1427                 }
1428
1429                 error = recv_read_nvlist(hdl, fd, drr->drr_payloadlen,
1430                     &stream_nv, flags.byteswap, zc);
1431                 if (error) {
1432                         error = zfs_error(hdl, EZFS_BADSTREAM, errbuf);
1433                         goto out;
1434                 }
1435         }
1436
1437         /*
1438          * Read in the end record and verify checksum.
1439          */
1440         if (0 != (error = recv_read(hdl, fd, &drre, sizeof (drre),
1441             flags.byteswap, NULL)))
1442                 goto out;
1443         if (flags.byteswap) {
1444                 drre.drr_type = BSWAP_32(drre.drr_type);
1445                 drre.drr_u.drr_end.drr_checksum.zc_word[0] =
1446                     BSWAP_64(drre.drr_u.drr_end.drr_checksum.zc_word[0]);
1447                 drre.drr_u.drr_end.drr_checksum.zc_word[1] =
1448                     BSWAP_64(drre.drr_u.drr_end.drr_checksum.zc_word[1]);
1449                 drre.drr_u.drr_end.drr_checksum.zc_word[2] =
1450                     BSWAP_64(drre.drr_u.drr_end.drr_checksum.zc_word[2]);
1451                 drre.drr_u.drr_end.drr_checksum.zc_word[3] =
1452                     BSWAP_64(drre.drr_u.drr_end.drr_checksum.zc_word[3]);
1453         }
1454         if (drre.drr_type != DRR_END) {
1455                 error = zfs_error(hdl, EZFS_BADSTREAM, errbuf);
1456                 goto out;
1457         }
1458         if (!ZIO_CHECKSUM_EQUAL(drre.drr_u.drr_end.drr_checksum, *zc)) {
1459                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1460                     "incorrect header checksum"));
1461                 error = zfs_error(hdl, EZFS_BADSTREAM, errbuf);
1462                 goto out;
1463         }
1464
1465         (void) nvlist_lookup_string(stream_nv, "fromsnap", &fromsnap);
1466
1467         if (drr->drr_payloadlen != 0) {
1468                 nvlist_t *stream_fss;
1469
1470                 VERIFY(0 == nvlist_lookup_nvlist(stream_nv, "fss",
1471                     &stream_fss));
1472                 if ((stream_avl = fsavl_create(stream_fss)) == NULL) {
1473                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1474                             "couldn't allocate avl tree"));
1475                         error = zfs_error(hdl, EZFS_NOMEM, errbuf);
1476                         goto out;
1477                 }
1478
1479                 if (fromsnap != NULL) {
1480                         (void) strlcpy(tofs, destname, ZFS_MAXNAMELEN);
1481                         if (flags.isprefix) {
1482                                 int i = strcspn(drr->drr_u.drr_begin.drr_toname,
1483                                     "/@");
1484                                 /* zfs_receive_one() will create_parents() */
1485                                 (void) strlcat(tofs,
1486                                     &drr->drr_u.drr_begin.drr_toname[i],
1487                                     ZFS_MAXNAMELEN);
1488                                 *strchr(tofs, '@') = '\0';
1489                         }
1490                         softerr = recv_incremental_replication(hdl, tofs,
1491                             flags, stream_nv, stream_avl);
1492                 }
1493         }
1494
1495
1496         /* Finally, receive each contained stream */
1497         do {
1498                 /*
1499                  * we should figure out if it has a recoverable
1500                  * error, in which case do a recv_skip() and drive on.
1501                  * Note, if we fail due to already having this guid,
1502                  * zfs_receive_one() will take care of it (ie,
1503                  * recv_skip() and return 0).
1504                  */
1505                 error = zfs_receive_impl(hdl, destname, flags, fd,
1506                     stream_avl, top_zfs);
1507                 if (error == ENODATA) {
1508                         error = 0;
1509                         break;
1510                 }
1511                 anyerr |= error;
1512         } while (error == 0);
1513
1514         if (drr->drr_payloadlen != 0 && fromsnap != NULL) {
1515                 /*
1516                  * Now that we have the fs's they sent us, try the
1517                  * renames again.
1518                  */
1519                 softerr = recv_incremental_replication(hdl, tofs, flags,
1520                     stream_nv, stream_avl);
1521         }
1522
1523 out:
1524         fsavl_destroy(stream_avl);
1525         if (stream_nv)
1526                 nvlist_free(stream_nv);
1527         if (softerr)
1528                 error = -2;
1529         if (anyerr)
1530                 error = -1;
1531         return (error);
1532 }
1533
1534 static int
1535 recv_skip(libzfs_handle_t *hdl, int fd, boolean_t byteswap)
1536 {
1537         dmu_replay_record_t *drr;
1538         void *buf = malloc(1<<20);
1539
1540         /* XXX would be great to use lseek if possible... */
1541         drr = buf;
1542
1543         while (recv_read(hdl, fd, drr, sizeof (dmu_replay_record_t),
1544             byteswap, NULL) == 0) {
1545                 if (byteswap)
1546                         drr->drr_type = BSWAP_32(drr->drr_type);
1547
1548                 switch (drr->drr_type) {
1549                 case DRR_BEGIN:
1550                         /* NB: not to be used on v2 stream packages */
1551                         assert(drr->drr_payloadlen == 0);
1552                         break;
1553
1554                 case DRR_END:
1555                         free(buf);
1556                         return (0);
1557
1558                 case DRR_OBJECT:
1559                         if (byteswap) {
1560                                 drr->drr_u.drr_object.drr_bonuslen =
1561                                     BSWAP_32(drr->drr_u.drr_object.
1562                                     drr_bonuslen);
1563                         }
1564                         (void) recv_read(hdl, fd, buf,
1565                             P2ROUNDUP(drr->drr_u.drr_object.drr_bonuslen, 8),
1566                             B_FALSE, NULL);
1567                         break;
1568
1569                 case DRR_WRITE:
1570                         if (byteswap) {
1571                                 drr->drr_u.drr_write.drr_length =
1572                                     BSWAP_64(drr->drr_u.drr_write.drr_length);
1573                         }
1574                         (void) recv_read(hdl, fd, buf,
1575                             drr->drr_u.drr_write.drr_length, B_FALSE, NULL);
1576                         break;
1577
1578                 case DRR_FREEOBJECTS:
1579                 case DRR_FREE:
1580                         break;
1581
1582                 default:
1583                         assert(!"invalid record type");
1584                 }
1585         }
1586
1587         free(buf);
1588         return (-1);
1589 }
1590
1591 /*
1592  * Restores a backup of tosnap from the file descriptor specified by infd.
1593  */
1594 static int
1595 zfs_receive_one(libzfs_handle_t *hdl, int infd, const char *tosnap,
1596     recvflags_t flags, dmu_replay_record_t *drr,
1597     dmu_replay_record_t *drr_noswap, avl_tree_t *stream_avl,
1598     char **top_zfs)
1599 {
1600         zfs_cmd_t zc = { 0 };
1601         time_t begin_time;
1602         int ioctl_err, ioctl_errno, err, choplen;
1603         char *cp;
1604         struct drr_begin *drrb = &drr->drr_u.drr_begin;
1605         char errbuf[1024];
1606         char chopprefix[ZFS_MAXNAMELEN];
1607         boolean_t newfs = B_FALSE;
1608         boolean_t stream_wantsnewfs;
1609         uint64_t parent_snapguid = 0;
1610         prop_changelist_t *clp = NULL;
1611         nvlist_t *snapprops_nvlist = NULL;
1612
1613         begin_time = time(NULL);
1614
1615         (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
1616             "cannot receive"));
1617
1618         if (stream_avl != NULL) {
1619                 char *snapname;
1620                 nvlist_t *fs = fsavl_find(stream_avl, drrb->drr_toguid,
1621                     &snapname);
1622                 nvlist_t *props;
1623                 int ret;
1624
1625                 (void) nvlist_lookup_uint64(fs, "parentfromsnap",
1626                     &parent_snapguid);
1627                 err = nvlist_lookup_nvlist(fs, "props", &props);
1628                 if (err)
1629                         VERIFY(0 == nvlist_alloc(&props, NV_UNIQUE_NAME, 0));
1630
1631                 if (flags.canmountoff) {
1632                         VERIFY(0 == nvlist_add_uint64(props,
1633                             zfs_prop_to_name(ZFS_PROP_CANMOUNT), 0));
1634                 }
1635                 ret = zcmd_write_src_nvlist(hdl, &zc, props);
1636                 if (err)
1637                         nvlist_free(props);
1638
1639                 if (0 == nvlist_lookup_nvlist(fs, "snapprops", &props)) {
1640                         VERIFY(0 == nvlist_lookup_nvlist(props,
1641                             snapname, &snapprops_nvlist));
1642                 }
1643
1644                 if (ret != 0)
1645                         return (-1);
1646         }
1647
1648         /*
1649          * Determine how much of the snapshot name stored in the stream
1650          * we are going to tack on to the name they specified on the
1651          * command line, and how much we are going to chop off.
1652          *
1653          * If they specified a snapshot, chop the entire name stored in
1654          * the stream.
1655          */
1656         (void) strcpy(chopprefix, drrb->drr_toname);
1657         if (flags.isprefix) {
1658                 /*
1659                  * They specified a fs with -d, we want to tack on
1660                  * everything but the pool name stored in the stream
1661                  */
1662                 if (strchr(tosnap, '@')) {
1663                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "invalid "
1664                             "argument - snapshot not allowed with -d"));
1665                         return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf));
1666                 }
1667                 cp = strchr(chopprefix, '/');
1668                 if (cp == NULL)
1669                         cp = strchr(chopprefix, '@');
1670                 *cp = '\0';
1671         } else if (strchr(tosnap, '@') == NULL) {
1672                 /*
1673                  * If they specified a filesystem without -d, we want to
1674                  * tack on everything after the fs specified in the
1675                  * first name from the stream.
1676                  */
1677                 cp = strchr(chopprefix, '@');
1678                 *cp = '\0';
1679         }
1680         choplen = strlen(chopprefix);
1681
1682         /*
1683          * Determine name of destination snapshot, store in zc_value.
1684          */
1685         (void) strcpy(zc.zc_value, tosnap);
1686         (void) strncat(zc.zc_value, drrb->drr_toname+choplen,
1687             sizeof (zc.zc_value));
1688         if (!zfs_name_valid(zc.zc_value, ZFS_TYPE_SNAPSHOT)) {
1689                 zcmd_free_nvlists(&zc);
1690                 return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf));
1691         }
1692
1693         /*
1694          * Determine the name of the origin snapshot, store in zc_string.
1695          */
1696         if (drrb->drr_flags & DRR_FLAG_CLONE) {
1697                 if (guid_to_name(hdl, tosnap,
1698                     drrb->drr_fromguid, zc.zc_string) != 0) {
1699                         zcmd_free_nvlists(&zc);
1700                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1701                             "local origin for clone %s does not exist"),
1702                             zc.zc_value);
1703                         return (zfs_error(hdl, EZFS_NOENT, errbuf));
1704                 }
1705                 if (flags.verbose)
1706                         (void) printf("found clone origin %s\n", zc.zc_string);
1707         }
1708
1709         stream_wantsnewfs = (drrb->drr_fromguid == NULL ||
1710             (drrb->drr_flags & DRR_FLAG_CLONE));
1711
1712         if (stream_wantsnewfs) {
1713                 /*
1714                  * if the parent fs does not exist, look for it based on
1715                  * the parent snap GUID
1716                  */
1717                 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
1718                     "cannot receive new filesystem stream"));
1719
1720                 (void) strcpy(zc.zc_name, zc.zc_value);
1721                 cp = strrchr(zc.zc_name, '/');
1722                 if (cp)
1723                         *cp = '\0';
1724                 if (cp &&
1725                     !zfs_dataset_exists(hdl, zc.zc_name, ZFS_TYPE_DATASET)) {
1726                         char suffix[ZFS_MAXNAMELEN];
1727                         (void) strcpy(suffix, strrchr(zc.zc_value, '/'));
1728                         if (guid_to_name(hdl, tosnap, parent_snapguid,
1729                             zc.zc_value) == 0) {
1730                                 *strchr(zc.zc_value, '@') = '\0';
1731                                 (void) strcat(zc.zc_value, suffix);
1732                         }
1733                 }
1734         } else {
1735                 /*
1736                  * if the fs does not exist, look for it based on the
1737                  * fromsnap GUID
1738                  */
1739                 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
1740                     "cannot receive incremental stream"));
1741
1742                 (void) strcpy(zc.zc_name, zc.zc_value);
1743                 *strchr(zc.zc_name, '@') = '\0';
1744
1745                 if (!zfs_dataset_exists(hdl, zc.zc_name, ZFS_TYPE_DATASET)) {
1746                         char snap[ZFS_MAXNAMELEN];
1747                         (void) strcpy(snap, strchr(zc.zc_value, '@'));
1748                         if (guid_to_name(hdl, tosnap, drrb->drr_fromguid,
1749                             zc.zc_value) == 0) {
1750                                 *strchr(zc.zc_value, '@') = '\0';
1751                                 (void) strcat(zc.zc_value, snap);
1752                         }
1753                 }
1754         }
1755
1756         (void) strcpy(zc.zc_name, zc.zc_value);
1757         *strchr(zc.zc_name, '@') = '\0';
1758
1759         if (zfs_dataset_exists(hdl, zc.zc_name, ZFS_TYPE_DATASET)) {
1760                 zfs_handle_t *zhp;
1761                 /*
1762                  * Destination fs exists.  Therefore this should either
1763                  * be an incremental, or the stream specifies a new fs
1764                  * (full stream or clone) and they want us to blow it
1765                  * away (and have therefore specified -F and removed any
1766                  * snapshots).
1767                  */
1768
1769                 if (stream_wantsnewfs) {
1770                         if (!flags.force) {
1771                                 zcmd_free_nvlists(&zc);
1772                                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1773                                     "destination '%s' exists\n"
1774                                     "must specify -F to overwrite it"),
1775                                     zc.zc_name);
1776                                 return (zfs_error(hdl, EZFS_EXISTS, errbuf));
1777                         }
1778                         if (ioctl(hdl->libzfs_fd, ZFS_IOC_SNAPSHOT_LIST_NEXT,
1779                             &zc) == 0) {
1780                                 zcmd_free_nvlists(&zc);
1781                                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1782                                     "destination has snapshots (eg. %s)\n"
1783                                     "must destroy them to overwrite it"),
1784                                     zc.zc_name);
1785                                 return (zfs_error(hdl, EZFS_EXISTS, errbuf));
1786                         }
1787                 }
1788
1789                 if ((zhp = zfs_open(hdl, zc.zc_name,
1790                     ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME)) == NULL) {
1791                         zcmd_free_nvlists(&zc);
1792                         return (-1);
1793                 }
1794
1795                 if (stream_wantsnewfs &&
1796                     zhp->zfs_dmustats.dds_origin[0]) {
1797                         zcmd_free_nvlists(&zc);
1798                         zfs_close(zhp);
1799                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1800                             "destination '%s' is a clone\n"
1801                             "must destroy it to overwrite it"),
1802                             zc.zc_name);
1803                         return (zfs_error(hdl, EZFS_EXISTS, errbuf));
1804                 }
1805
1806                 if (!flags.dryrun && zhp->zfs_type == ZFS_TYPE_FILESYSTEM &&
1807                     stream_wantsnewfs) {
1808                         /* We can't do online recv in this case */
1809                         clp = changelist_gather(zhp, ZFS_PROP_NAME, 0, 0);
1810                         if (clp == NULL) {
1811                                 zfs_close(zhp);
1812                                 zcmd_free_nvlists(&zc);
1813                                 return (-1);
1814                         }
1815                         if (changelist_prefix(clp) != 0) {
1816                                 changelist_free(clp);
1817                                 zfs_close(zhp);
1818                                 zcmd_free_nvlists(&zc);
1819                                 return (-1);
1820                         }
1821                 }
1822                 if (!flags.dryrun && zhp->zfs_type == ZFS_TYPE_VOLUME &&
1823                     zvol_remove_link(hdl, zhp->zfs_name) != 0) {
1824                         zfs_close(zhp);
1825                         zcmd_free_nvlists(&zc);
1826                         return (-1);
1827                 }
1828                 zfs_close(zhp);
1829         } else {
1830                 /*
1831                  * Destination filesystem does not exist.  Therefore we better
1832                  * be creating a new filesystem (either from a full backup, or
1833                  * a clone).  It would therefore be invalid if the user
1834                  * specified only the pool name (i.e. if the destination name
1835                  * contained no slash character).
1836                  */
1837                 if (!stream_wantsnewfs ||
1838                     (cp = strrchr(zc.zc_name, '/')) == NULL) {
1839                         zcmd_free_nvlists(&zc);
1840                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1841                             "destination '%s' does not exist"), zc.zc_name);
1842                         return (zfs_error(hdl, EZFS_NOENT, errbuf));
1843                 }
1844
1845                 /*
1846                  * Trim off the final dataset component so we perform the
1847                  * recvbackup ioctl to the filesystems's parent.
1848                  */
1849                 *cp = '\0';
1850
1851                 if (flags.isprefix && !flags.dryrun &&
1852                     create_parents(hdl, zc.zc_value, strlen(tosnap)) != 0) {
1853                         zcmd_free_nvlists(&zc);
1854                         return (zfs_error(hdl, EZFS_BADRESTORE, errbuf));
1855                 }
1856
1857                 newfs = B_TRUE;
1858         }
1859
1860         zc.zc_begin_record = drr_noswap->drr_u.drr_begin;
1861         zc.zc_cookie = infd;
1862         zc.zc_guid = flags.force;
1863         if (flags.verbose) {
1864                 (void) printf("%s %s stream of %s into %s\n",
1865                     flags.dryrun ? "would receive" : "receiving",
1866                     drrb->drr_fromguid ? "incremental" : "full",
1867                     drrb->drr_toname, zc.zc_value);
1868                 (void) fflush(stdout);
1869         }
1870
1871         if (flags.dryrun) {
1872                 zcmd_free_nvlists(&zc);
1873                 return (recv_skip(hdl, infd, flags.byteswap));
1874         }
1875
1876         err = ioctl_err = zfs_ioctl(hdl, ZFS_IOC_RECV, &zc);
1877         ioctl_errno = errno;
1878         zcmd_free_nvlists(&zc);
1879
1880         if (err == 0 && snapprops_nvlist) {
1881                 zfs_cmd_t zc2 = { 0 };
1882
1883                 (void) strcpy(zc2.zc_name, zc.zc_value);
1884                 if (zcmd_write_src_nvlist(hdl, &zc2, snapprops_nvlist) == 0) {
1885                         (void) zfs_ioctl(hdl, ZFS_IOC_SET_PROP, &zc2);
1886                         zcmd_free_nvlists(&zc2);
1887                 }
1888         }
1889
1890         if (err && (ioctl_errno == ENOENT || ioctl_errno == ENODEV)) {
1891                 /*
1892                  * It may be that this snapshot already exists,
1893                  * in which case we want to consume & ignore it
1894                  * rather than failing.
1895                  */
1896                 avl_tree_t *local_avl;
1897                 nvlist_t *local_nv, *fs;
1898                 char *cp = strchr(zc.zc_value, '@');
1899
1900                 /*
1901                  * XXX Do this faster by just iterating over snaps in
1902                  * this fs.  Also if zc_value does not exist, we will
1903                  * get a strange "does not exist" error message.
1904                  */
1905                 *cp = '\0';
1906                 if (gather_nvlist(hdl, zc.zc_value, NULL, NULL,
1907                     &local_nv, &local_avl) == 0) {
1908                         *cp = '@';
1909                         fs = fsavl_find(local_avl, drrb->drr_toguid, NULL);
1910                         fsavl_destroy(local_avl);
1911                         nvlist_free(local_nv);
1912
1913                         if (fs != NULL) {
1914                                 if (flags.verbose) {
1915                                         (void) printf("snap %s already exists; "
1916                                             "ignoring\n", zc.zc_value);
1917                                 }
1918                                 ioctl_err = recv_skip(hdl, infd,
1919                                     flags.byteswap);
1920                         }
1921                 }
1922                 *cp = '@';
1923         }
1924
1925
1926         if (ioctl_err != 0) {
1927                 switch (ioctl_errno) {
1928                 case ENODEV:
1929                         cp = strchr(zc.zc_value, '@');
1930                         *cp = '\0';
1931                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1932                             "most recent snapshot of %s does not\n"
1933                             "match incremental source"), zc.zc_value);
1934                         (void) zfs_error(hdl, EZFS_BADRESTORE, errbuf);
1935                         *cp = '@';
1936                         break;
1937                 case ETXTBSY:
1938                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1939                             "destination %s has been modified\n"
1940                             "since most recent snapshot"), zc.zc_name);
1941                         (void) zfs_error(hdl, EZFS_BADRESTORE, errbuf);
1942                         break;
1943                 case EEXIST:
1944                         cp = strchr(zc.zc_value, '@');
1945                         if (newfs) {
1946                                 /* it's the containing fs that exists */
1947                                 *cp = '\0';
1948                         }
1949                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1950                             "destination already exists"));
1951                         (void) zfs_error_fmt(hdl, EZFS_EXISTS,
1952                             dgettext(TEXT_DOMAIN, "cannot restore to %s"),
1953                             zc.zc_value);
1954                         *cp = '@';
1955                         break;
1956                 case EINVAL:
1957                         (void) zfs_error(hdl, EZFS_BADSTREAM, errbuf);
1958                         break;
1959                 case ECKSUM:
1960                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1961                             "invalid stream (checksum mismatch)"));
1962                         (void) zfs_error(hdl, EZFS_BADSTREAM, errbuf);
1963                         break;
1964                 default:
1965                         (void) zfs_standard_error(hdl, ioctl_errno, errbuf);
1966                 }
1967         }
1968
1969         /*
1970          * Mount or recreate the /dev links for the target filesystem
1971          * (if created, or if we tore them down to do an incremental
1972          * restore), and the /dev links for the new snapshot (if
1973          * created). Also mount any children of the target filesystem
1974          * if we did a replication receive (indicated by stream_avl
1975          * being non-NULL).
1976          */
1977         cp = strchr(zc.zc_value, '@');
1978         if (cp && (ioctl_err == 0 || !newfs)) {
1979                 zfs_handle_t *h;
1980
1981                 *cp = '\0';
1982                 h = zfs_open(hdl, zc.zc_value,
1983                     ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME);
1984                 if (h != NULL) {
1985                         if (h->zfs_type == ZFS_TYPE_VOLUME) {
1986                                 *cp = '@';
1987                                 err = zvol_create_link(hdl, h->zfs_name);
1988                                 if (err == 0 && ioctl_err == 0)
1989                                         err = zvol_create_link(hdl,
1990                                             zc.zc_value);
1991                         } else if (newfs || stream_avl) {
1992                                 /*
1993                                  * Track the first/top of hierarchy fs,
1994                                  * for mounting and sharing later.
1995                                  */
1996                                 if (top_zfs && *top_zfs == NULL)
1997                                         *top_zfs = zfs_strdup(hdl, zc.zc_value);
1998                         }
1999                         zfs_close(h);
2000                 }
2001                 *cp = '@';
2002         }
2003
2004         if (clp) {
2005                 err |= changelist_postfix(clp);
2006                 changelist_free(clp);
2007         }
2008
2009         if (err || ioctl_err)
2010                 return (-1);
2011
2012         if (flags.verbose) {
2013                 char buf1[64];
2014                 char buf2[64];
2015                 uint64_t bytes = zc.zc_cookie;
2016                 time_t delta = time(NULL) - begin_time;
2017                 if (delta == 0)
2018                         delta = 1;
2019                 zfs_nicenum(bytes, buf1, sizeof (buf1));
2020                 zfs_nicenum(bytes/delta, buf2, sizeof (buf1));
2021
2022                 (void) printf("received %sB stream in %lu seconds (%sB/sec)\n",
2023                     buf1, delta, buf2);
2024         }
2025
2026         return (0);
2027 }
2028
2029 static int
2030 zfs_receive_impl(libzfs_handle_t *hdl, const char *tosnap, recvflags_t flags,
2031     int infd, avl_tree_t *stream_avl, char **top_zfs)
2032 {
2033         int err;
2034         dmu_replay_record_t drr, drr_noswap;
2035         struct drr_begin *drrb = &drr.drr_u.drr_begin;
2036         char errbuf[1024];
2037         zio_cksum_t zcksum = { 0 };
2038
2039         (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
2040             "cannot receive"));
2041
2042         if (flags.isprefix &&
2043             !zfs_dataset_exists(hdl, tosnap, ZFS_TYPE_DATASET)) {
2044                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "specified fs "
2045                     "(%s) does not exist"), tosnap);
2046                 return (zfs_error(hdl, EZFS_NOENT, errbuf));
2047         }
2048
2049         /* read in the BEGIN record */
2050         if (0 != (err = recv_read(hdl, infd, &drr, sizeof (drr), B_FALSE,
2051             &zcksum)))
2052                 return (err);
2053
2054         if (drr.drr_type == DRR_END || drr.drr_type == BSWAP_32(DRR_END)) {
2055                 /* It's the double end record at the end of a package */
2056                 return (ENODATA);
2057         }
2058
2059         /* the kernel needs the non-byteswapped begin record */
2060         drr_noswap = drr;
2061
2062         flags.byteswap = B_FALSE;
2063         if (drrb->drr_magic == BSWAP_64(DMU_BACKUP_MAGIC)) {
2064                 /*
2065                  * We computed the checksum in the wrong byteorder in
2066                  * recv_read() above; do it again correctly.
2067                  */
2068                 bzero(&zcksum, sizeof (zio_cksum_t));
2069                 fletcher_4_incremental_byteswap(&drr, sizeof (drr), &zcksum);
2070                 flags.byteswap = B_TRUE;
2071
2072                 drr.drr_type = BSWAP_32(drr.drr_type);
2073                 drr.drr_payloadlen = BSWAP_32(drr.drr_payloadlen);
2074                 drrb->drr_magic = BSWAP_64(drrb->drr_magic);
2075                 drrb->drr_version = BSWAP_64(drrb->drr_version);
2076                 drrb->drr_creation_time = BSWAP_64(drrb->drr_creation_time);
2077                 drrb->drr_type = BSWAP_32(drrb->drr_type);
2078                 drrb->drr_flags = BSWAP_32(drrb->drr_flags);
2079                 drrb->drr_toguid = BSWAP_64(drrb->drr_toguid);
2080                 drrb->drr_fromguid = BSWAP_64(drrb->drr_fromguid);
2081         }
2082
2083         if (drrb->drr_magic != DMU_BACKUP_MAGIC || drr.drr_type != DRR_BEGIN) {
2084                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "invalid "
2085                     "stream (bad magic number)"));
2086                 return (zfs_error(hdl, EZFS_BADSTREAM, errbuf));
2087         }
2088
2089         if (strchr(drrb->drr_toname, '@') == NULL) {
2090                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "invalid "
2091                     "stream (bad snapshot name)"));
2092                 return (zfs_error(hdl, EZFS_BADSTREAM, errbuf));
2093         }
2094
2095         if (drrb->drr_version == DMU_BACKUP_STREAM_VERSION) {
2096                 return (zfs_receive_one(hdl, infd, tosnap, flags,
2097                     &drr, &drr_noswap, stream_avl, top_zfs));
2098         } else if (drrb->drr_version == DMU_BACKUP_HEADER_VERSION) {
2099                 return (zfs_receive_package(hdl, infd, tosnap, flags,
2100                     &drr, &zcksum, top_zfs));
2101         } else {
2102                 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
2103                     "stream is unsupported version %llu"),
2104                     drrb->drr_version);
2105                 return (zfs_error(hdl, EZFS_BADSTREAM, errbuf));
2106         }
2107 }
2108
2109 /*
2110  * Restores a backup of tosnap from the file descriptor specified by infd.
2111  * Return 0 on total success, -2 if some things couldn't be
2112  * destroyed/renamed/promoted, -1 if some things couldn't be received.
2113  * (-1 will override -2).
2114  */
2115 int
2116 zfs_receive(libzfs_handle_t *hdl, const char *tosnap, recvflags_t flags,
2117     int infd, avl_tree_t *stream_avl)
2118 {
2119         char *top_zfs = NULL;
2120         int err;
2121
2122         err = zfs_receive_impl(hdl, tosnap, flags, infd, stream_avl, &top_zfs);
2123
2124         if (err == 0 && !flags.nomount && top_zfs) {
2125                 zfs_handle_t *zhp;
2126                 prop_changelist_t *clp;
2127
2128                 zhp = zfs_open(hdl, top_zfs, ZFS_TYPE_FILESYSTEM);
2129                 if (zhp != NULL) {
2130                         clp = changelist_gather(zhp, ZFS_PROP_MOUNTPOINT,
2131                             CL_GATHER_MOUNT_ALWAYS, 0);
2132                         zfs_close(zhp);
2133                         if (clp != NULL) {
2134                                 /* mount and share received datasets */
2135                                 err = changelist_postfix(clp);
2136                                 changelist_free(clp);
2137                         }
2138                 }
2139                 if (zhp == NULL || clp == NULL || err)
2140                         err = -1;
2141         }
2142         if (top_zfs)
2143                 free(top_zfs);
2144
2145         return (err);
2146 }