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