libzfs_sendrecv.c revision 10299:80845694147f
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 52static 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 */ 58typedef 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 65static int 66fsavl_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 */ 83static nvlist_t * 84fsavl_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 100static void 101fsavl_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 */ 119static avl_tree_t * 120fsavl_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 */ 169typedef 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 201static void send_iterate_prop(zfs_handle_t *zhp, nvlist_t *nv); 202 203static int 204send_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 233static void 234send_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 */ 287static int 288send_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 342static int 343gather_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 */ 379typedef struct zfs_node { 380 zfs_handle_t *zn_handle; 381 avl_node_t zn_avlnode; 382} zfs_node_t; 383 384static int 385zfs_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 */ 396static int 397zfs_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 418static int 419zfs_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 */ 445typedef 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 */ 462static int 463dump_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 521static int 522dump_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 561static int 562dump_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 645static int 646dump_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 655again: 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 */ 717int 718zfs_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 845static int 846recv_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 875static int 876recv_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 902static int 903recv_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 976static int 977recv_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 1030typedef struct guid_to_name_data { 1031 uint64_t guid; 1032 char *name; 1033} guid_to_name_data_t; 1034 1035static int 1036guid_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 1050static int 1051guid_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, >nd); 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, >nd); 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 */ 1092static int 1093created_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 1131static int 1132recv_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 char *s1, *s2; 1143 1144 VERIFY(0 == nvlist_lookup_string(stream_nv, "fromsnap", &fromsnap)); 1145 VERIFY(0 == nvlist_lookup_string(stream_nv, "tosnap", &tosnap)); 1146 1147 if (flags.dryrun) 1148 return (0); 1149 1150again: 1151 needagain = progress = B_FALSE; 1152 1153 if ((error = gather_nvlist(hdl, tofs, fromsnap, NULL, 1154 &local_nv, &local_avl)) != 0) 1155 return (error); 1156 1157 /* 1158 * Process deletes and renames 1159 */ 1160 for (fselem = nvlist_next_nvpair(local_nv, NULL); 1161 fselem; fselem = nextfselem) { 1162 nvlist_t *nvfs, *snaps; 1163 nvlist_t *stream_nvfs = NULL; 1164 nvpair_t *snapelem, *nextsnapelem; 1165 uint64_t fromguid = 0; 1166 uint64_t originguid = 0; 1167 uint64_t stream_originguid = 0; 1168 uint64_t parent_fromsnap_guid, stream_parent_fromsnap_guid; 1169 char *fsname, *stream_fsname; 1170 1171 nextfselem = nvlist_next_nvpair(local_nv, fselem); 1172 1173 VERIFY(0 == nvpair_value_nvlist(fselem, &nvfs)); 1174 VERIFY(0 == nvlist_lookup_nvlist(nvfs, "snaps", &snaps)); 1175 VERIFY(0 == nvlist_lookup_string(nvfs, "name", &fsname)); 1176 VERIFY(0 == nvlist_lookup_uint64(nvfs, "parentfromsnap", 1177 &parent_fromsnap_guid)); 1178 (void) nvlist_lookup_uint64(nvfs, "origin", &originguid); 1179 1180 /* 1181 * First find the stream's fs, so we can check for 1182 * a different origin (due to "zfs promote") 1183 */ 1184 for (snapelem = nvlist_next_nvpair(snaps, NULL); 1185 snapelem; snapelem = nvlist_next_nvpair(snaps, snapelem)) { 1186 uint64_t thisguid; 1187 1188 VERIFY(0 == nvpair_value_uint64(snapelem, &thisguid)); 1189 stream_nvfs = fsavl_find(stream_avl, thisguid, NULL); 1190 1191 if (stream_nvfs != NULL) 1192 break; 1193 } 1194 1195 /* check for promote */ 1196 (void) nvlist_lookup_uint64(stream_nvfs, "origin", 1197 &stream_originguid); 1198 if (stream_nvfs && originguid != stream_originguid) { 1199 switch (created_before(hdl, local_avl, 1200 stream_originguid, originguid)) { 1201 case 1: { 1202 /* promote it! */ 1203 zfs_cmd_t zc = { 0 }; 1204 nvlist_t *origin_nvfs; 1205 char *origin_fsname; 1206 1207 if (flags.verbose) 1208 (void) printf("promoting %s\n", fsname); 1209 1210 origin_nvfs = fsavl_find(local_avl, originguid, 1211 NULL); 1212 VERIFY(0 == nvlist_lookup_string(origin_nvfs, 1213 "name", &origin_fsname)); 1214 (void) strlcpy(zc.zc_value, origin_fsname, 1215 sizeof (zc.zc_value)); 1216 (void) strlcpy(zc.zc_name, fsname, 1217 sizeof (zc.zc_name)); 1218 error = zfs_ioctl(hdl, ZFS_IOC_PROMOTE, &zc); 1219 if (error == 0) 1220 progress = B_TRUE; 1221 break; 1222 } 1223 default: 1224 break; 1225 case -1: 1226 fsavl_destroy(local_avl); 1227 nvlist_free(local_nv); 1228 return (-1); 1229 } 1230 /* 1231 * We had/have the wrong origin, therefore our 1232 * list of snapshots is wrong. Need to handle 1233 * them on the next pass. 1234 */ 1235 needagain = B_TRUE; 1236 continue; 1237 } 1238 1239 for (snapelem = nvlist_next_nvpair(snaps, NULL); 1240 snapelem; snapelem = nextsnapelem) { 1241 uint64_t thisguid; 1242 char *stream_snapname; 1243 nvlist_t *found, *props; 1244 1245 nextsnapelem = nvlist_next_nvpair(snaps, snapelem); 1246 1247 VERIFY(0 == nvpair_value_uint64(snapelem, &thisguid)); 1248 found = fsavl_find(stream_avl, thisguid, 1249 &stream_snapname); 1250 1251 /* check for delete */ 1252 if (found == NULL) { 1253 char name[ZFS_MAXNAMELEN]; 1254 1255 if (!flags.force) 1256 continue; 1257 1258 (void) snprintf(name, sizeof (name), "%s@%s", 1259 fsname, nvpair_name(snapelem)); 1260 1261 error = recv_destroy(hdl, name, 1262 strlen(fsname)+1, newname, flags); 1263 if (error) 1264 needagain = B_TRUE; 1265 else 1266 progress = B_TRUE; 1267 continue; 1268 } 1269 1270 stream_nvfs = found; 1271 1272 if (0 == nvlist_lookup_nvlist(stream_nvfs, "snapprops", 1273 &props) && 0 == nvlist_lookup_nvlist(props, 1274 stream_snapname, &props)) { 1275 zfs_cmd_t zc = { 0 }; 1276 1277 zc.zc_cookie = B_TRUE; /* clear current props */ 1278 (void) snprintf(zc.zc_name, sizeof (zc.zc_name), 1279 "%s@%s", fsname, nvpair_name(snapelem)); 1280 if (zcmd_write_src_nvlist(hdl, &zc, 1281 props) == 0) { 1282 (void) zfs_ioctl(hdl, 1283 ZFS_IOC_SET_PROP, &zc); 1284 zcmd_free_nvlists(&zc); 1285 } 1286 } 1287 1288 /* check for different snapname */ 1289 if (strcmp(nvpair_name(snapelem), 1290 stream_snapname) != 0) { 1291 char name[ZFS_MAXNAMELEN]; 1292 char tryname[ZFS_MAXNAMELEN]; 1293 1294 (void) snprintf(name, sizeof (name), "%s@%s", 1295 fsname, nvpair_name(snapelem)); 1296 (void) snprintf(tryname, sizeof (name), "%s@%s", 1297 fsname, stream_snapname); 1298 1299 error = recv_rename(hdl, name, tryname, 1300 strlen(fsname)+1, newname, flags); 1301 if (error) 1302 needagain = B_TRUE; 1303 else 1304 progress = B_TRUE; 1305 } 1306 1307 if (strcmp(stream_snapname, fromsnap) == 0) 1308 fromguid = thisguid; 1309 } 1310 1311 /* check for delete */ 1312 if (stream_nvfs == NULL) { 1313 if (!flags.force) 1314 continue; 1315 1316 error = recv_destroy(hdl, fsname, strlen(tofs)+1, 1317 newname, flags); 1318 if (error) 1319 needagain = B_TRUE; 1320 else 1321 progress = B_TRUE; 1322 continue; 1323 } 1324 1325 if (fromguid == 0 && flags.verbose) { 1326 (void) printf("local fs %s does not have fromsnap " 1327 "(%s in stream); must have been deleted locally; " 1328 "ignoring\n", fsname, fromsnap); 1329 continue; 1330 } 1331 1332 VERIFY(0 == nvlist_lookup_string(stream_nvfs, 1333 "name", &stream_fsname)); 1334 VERIFY(0 == nvlist_lookup_uint64(stream_nvfs, 1335 "parentfromsnap", &stream_parent_fromsnap_guid)); 1336 1337 /* check for rename */ 1338 if ((stream_parent_fromsnap_guid != 0 && 1339 stream_parent_fromsnap_guid != parent_fromsnap_guid) || 1340 ((s1 = strrchr(fsname, '/')) && 1341 (s2 = strrchr(stream_fsname, '/')) && 1342 strcmp(s1, s2) != 0)) { 1343 nvlist_t *parent; 1344 char tryname[ZFS_MAXNAMELEN]; 1345 1346 parent = fsavl_find(local_avl, 1347 stream_parent_fromsnap_guid, NULL); 1348 /* 1349 * NB: parent might not be found if we used the 1350 * tosnap for stream_parent_fromsnap_guid, 1351 * because the parent is a newly-created fs; 1352 * we'll be able to rename it after we recv the 1353 * new fs. 1354 */ 1355 if (parent != NULL) { 1356 char *pname; 1357 1358 VERIFY(0 == nvlist_lookup_string(parent, "name", 1359 &pname)); 1360 (void) snprintf(tryname, sizeof (tryname), 1361 "%s%s", pname, strrchr(stream_fsname, '/')); 1362 } else { 1363 tryname[0] = '\0'; 1364 if (flags.verbose) { 1365 (void) printf("local fs %s new parent " 1366 "not found\n", fsname); 1367 } 1368 } 1369 1370 error = recv_rename(hdl, fsname, tryname, 1371 strlen(tofs)+1, newname, flags); 1372 if (error) 1373 needagain = B_TRUE; 1374 else 1375 progress = B_TRUE; 1376 } 1377 } 1378 1379 fsavl_destroy(local_avl); 1380 nvlist_free(local_nv); 1381 1382 if (needagain && progress) { 1383 /* do another pass to fix up temporary names */ 1384 if (flags.verbose) 1385 (void) printf("another pass:\n"); 1386 goto again; 1387 } 1388 1389 return (needagain); 1390} 1391 1392static int 1393zfs_receive_package(libzfs_handle_t *hdl, int fd, const char *destname, 1394 recvflags_t flags, dmu_replay_record_t *drr, zio_cksum_t *zc, 1395 char **top_zfs) 1396{ 1397 nvlist_t *stream_nv = NULL; 1398 avl_tree_t *stream_avl = NULL; 1399 char *fromsnap = NULL; 1400 char tofs[ZFS_MAXNAMELEN]; 1401 char errbuf[1024]; 1402 dmu_replay_record_t drre; 1403 int error; 1404 boolean_t anyerr = B_FALSE; 1405 boolean_t softerr = B_FALSE; 1406 1407 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN, 1408 "cannot receive")); 1409 1410 if (strchr(destname, '@')) { 1411 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 1412 "can not specify snapshot name for multi-snapshot stream")); 1413 return (zfs_error(hdl, EZFS_BADSTREAM, errbuf)); 1414 } 1415 1416 assert(drr->drr_type == DRR_BEGIN); 1417 assert(drr->drr_u.drr_begin.drr_magic == DMU_BACKUP_MAGIC); 1418 assert(drr->drr_u.drr_begin.drr_version == DMU_BACKUP_HEADER_VERSION); 1419 1420 /* 1421 * Read in the nvlist from the stream. 1422 */ 1423 if (drr->drr_payloadlen != 0) { 1424 if (!flags.isprefix) { 1425 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 1426 "must use -d to receive replication " 1427 "(send -R) stream")); 1428 return (zfs_error(hdl, EZFS_BADSTREAM, errbuf)); 1429 } 1430 1431 error = recv_read_nvlist(hdl, fd, drr->drr_payloadlen, 1432 &stream_nv, flags.byteswap, zc); 1433 if (error) { 1434 error = zfs_error(hdl, EZFS_BADSTREAM, errbuf); 1435 goto out; 1436 } 1437 } 1438 1439 /* 1440 * Read in the end record and verify checksum. 1441 */ 1442 if (0 != (error = recv_read(hdl, fd, &drre, sizeof (drre), 1443 flags.byteswap, NULL))) 1444 goto out; 1445 if (flags.byteswap) { 1446 drre.drr_type = BSWAP_32(drre.drr_type); 1447 drre.drr_u.drr_end.drr_checksum.zc_word[0] = 1448 BSWAP_64(drre.drr_u.drr_end.drr_checksum.zc_word[0]); 1449 drre.drr_u.drr_end.drr_checksum.zc_word[1] = 1450 BSWAP_64(drre.drr_u.drr_end.drr_checksum.zc_word[1]); 1451 drre.drr_u.drr_end.drr_checksum.zc_word[2] = 1452 BSWAP_64(drre.drr_u.drr_end.drr_checksum.zc_word[2]); 1453 drre.drr_u.drr_end.drr_checksum.zc_word[3] = 1454 BSWAP_64(drre.drr_u.drr_end.drr_checksum.zc_word[3]); 1455 } 1456 if (drre.drr_type != DRR_END) { 1457 error = zfs_error(hdl, EZFS_BADSTREAM, errbuf); 1458 goto out; 1459 } 1460 if (!ZIO_CHECKSUM_EQUAL(drre.drr_u.drr_end.drr_checksum, *zc)) { 1461 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 1462 "incorrect header checksum")); 1463 error = zfs_error(hdl, EZFS_BADSTREAM, errbuf); 1464 goto out; 1465 } 1466 1467 (void) nvlist_lookup_string(stream_nv, "fromsnap", &fromsnap); 1468 1469 if (drr->drr_payloadlen != 0) { 1470 nvlist_t *stream_fss; 1471 1472 VERIFY(0 == nvlist_lookup_nvlist(stream_nv, "fss", 1473 &stream_fss)); 1474 if ((stream_avl = fsavl_create(stream_fss)) == NULL) { 1475 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 1476 "couldn't allocate avl tree")); 1477 error = zfs_error(hdl, EZFS_NOMEM, errbuf); 1478 goto out; 1479 } 1480 1481 if (fromsnap != NULL) { 1482 (void) strlcpy(tofs, destname, ZFS_MAXNAMELEN); 1483 if (flags.isprefix) { 1484 int i = strcspn(drr->drr_u.drr_begin.drr_toname, 1485 "/@"); 1486 /* zfs_receive_one() will create_parents() */ 1487 (void) strlcat(tofs, 1488 &drr->drr_u.drr_begin.drr_toname[i], 1489 ZFS_MAXNAMELEN); 1490 *strchr(tofs, '@') = '\0'; 1491 } 1492 softerr = recv_incremental_replication(hdl, tofs, 1493 flags, stream_nv, stream_avl); 1494 } 1495 } 1496 1497 1498 /* Finally, receive each contained stream */ 1499 do { 1500 /* 1501 * we should figure out if it has a recoverable 1502 * error, in which case do a recv_skip() and drive on. 1503 * Note, if we fail due to already having this guid, 1504 * zfs_receive_one() will take care of it (ie, 1505 * recv_skip() and return 0). 1506 */ 1507 error = zfs_receive_impl(hdl, destname, flags, fd, 1508 stream_avl, top_zfs); 1509 if (error == ENODATA) { 1510 error = 0; 1511 break; 1512 } 1513 anyerr |= error; 1514 } while (error == 0); 1515 1516 if (drr->drr_payloadlen != 0 && fromsnap != NULL) { 1517 /* 1518 * Now that we have the fs's they sent us, try the 1519 * renames again. 1520 */ 1521 softerr = recv_incremental_replication(hdl, tofs, flags, 1522 stream_nv, stream_avl); 1523 } 1524 1525out: 1526 fsavl_destroy(stream_avl); 1527 if (stream_nv) 1528 nvlist_free(stream_nv); 1529 if (softerr) 1530 error = -2; 1531 if (anyerr) 1532 error = -1; 1533 return (error); 1534} 1535 1536static int 1537recv_skip(libzfs_handle_t *hdl, int fd, boolean_t byteswap) 1538{ 1539 dmu_replay_record_t *drr; 1540 void *buf = malloc(1<<20); 1541 1542 /* XXX would be great to use lseek if possible... */ 1543 drr = buf; 1544 1545 while (recv_read(hdl, fd, drr, sizeof (dmu_replay_record_t), 1546 byteswap, NULL) == 0) { 1547 if (byteswap) 1548 drr->drr_type = BSWAP_32(drr->drr_type); 1549 1550 switch (drr->drr_type) { 1551 case DRR_BEGIN: 1552 /* NB: not to be used on v2 stream packages */ 1553 assert(drr->drr_payloadlen == 0); 1554 break; 1555 1556 case DRR_END: 1557 free(buf); 1558 return (0); 1559 1560 case DRR_OBJECT: 1561 if (byteswap) { 1562 drr->drr_u.drr_object.drr_bonuslen = 1563 BSWAP_32(drr->drr_u.drr_object. 1564 drr_bonuslen); 1565 } 1566 (void) recv_read(hdl, fd, buf, 1567 P2ROUNDUP(drr->drr_u.drr_object.drr_bonuslen, 8), 1568 B_FALSE, NULL); 1569 break; 1570 1571 case DRR_WRITE: 1572 if (byteswap) { 1573 drr->drr_u.drr_write.drr_length = 1574 BSWAP_64(drr->drr_u.drr_write.drr_length); 1575 } 1576 (void) recv_read(hdl, fd, buf, 1577 drr->drr_u.drr_write.drr_length, B_FALSE, NULL); 1578 break; 1579 1580 case DRR_FREEOBJECTS: 1581 case DRR_FREE: 1582 break; 1583 1584 default: 1585 assert(!"invalid record type"); 1586 } 1587 } 1588 1589 free(buf); 1590 return (-1); 1591} 1592 1593/* 1594 * Restores a backup of tosnap from the file descriptor specified by infd. 1595 */ 1596static int 1597zfs_receive_one(libzfs_handle_t *hdl, int infd, const char *tosnap, 1598 recvflags_t flags, dmu_replay_record_t *drr, 1599 dmu_replay_record_t *drr_noswap, avl_tree_t *stream_avl, 1600 char **top_zfs) 1601{ 1602 zfs_cmd_t zc = { 0 }; 1603 time_t begin_time; 1604 int ioctl_err, ioctl_errno, err, choplen; 1605 char *cp; 1606 struct drr_begin *drrb = &drr->drr_u.drr_begin; 1607 char errbuf[1024]; 1608 char chopprefix[ZFS_MAXNAMELEN]; 1609 boolean_t newfs = B_FALSE; 1610 boolean_t stream_wantsnewfs; 1611 uint64_t parent_snapguid = 0; 1612 prop_changelist_t *clp = NULL; 1613 nvlist_t *snapprops_nvlist = NULL; 1614 1615 begin_time = time(NULL); 1616 1617 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN, 1618 "cannot receive")); 1619 1620 if (stream_avl != NULL) { 1621 char *snapname; 1622 nvlist_t *fs = fsavl_find(stream_avl, drrb->drr_toguid, 1623 &snapname); 1624 nvlist_t *props; 1625 int ret; 1626 1627 (void) nvlist_lookup_uint64(fs, "parentfromsnap", 1628 &parent_snapguid); 1629 err = nvlist_lookup_nvlist(fs, "props", &props); 1630 if (err) 1631 VERIFY(0 == nvlist_alloc(&props, NV_UNIQUE_NAME, 0)); 1632 1633 if (flags.canmountoff) { 1634 VERIFY(0 == nvlist_add_uint64(props, 1635 zfs_prop_to_name(ZFS_PROP_CANMOUNT), 0)); 1636 } 1637 ret = zcmd_write_src_nvlist(hdl, &zc, props); 1638 if (err) 1639 nvlist_free(props); 1640 1641 if (0 == nvlist_lookup_nvlist(fs, "snapprops", &props)) { 1642 VERIFY(0 == nvlist_lookup_nvlist(props, 1643 snapname, &snapprops_nvlist)); 1644 } 1645 1646 if (ret != 0) 1647 return (-1); 1648 } 1649 1650 /* 1651 * Determine how much of the snapshot name stored in the stream 1652 * we are going to tack on to the name they specified on the 1653 * command line, and how much we are going to chop off. 1654 * 1655 * If they specified a snapshot, chop the entire name stored in 1656 * the stream. 1657 */ 1658 (void) strcpy(chopprefix, drrb->drr_toname); 1659 if (flags.isprefix) { 1660 /* 1661 * They specified a fs with -d, we want to tack on 1662 * everything but the pool name stored in the stream 1663 */ 1664 if (strchr(tosnap, '@')) { 1665 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "invalid " 1666 "argument - snapshot not allowed with -d")); 1667 return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf)); 1668 } 1669 cp = strchr(chopprefix, '/'); 1670 if (cp == NULL) 1671 cp = strchr(chopprefix, '@'); 1672 *cp = '\0'; 1673 } else if (strchr(tosnap, '@') == NULL) { 1674 /* 1675 * If they specified a filesystem without -d, we want to 1676 * tack on everything after the fs specified in the 1677 * first name from the stream. 1678 */ 1679 cp = strchr(chopprefix, '@'); 1680 *cp = '\0'; 1681 } 1682 choplen = strlen(chopprefix); 1683 1684 /* 1685 * Determine name of destination snapshot, store in zc_value. 1686 */ 1687 (void) strcpy(zc.zc_value, tosnap); 1688 (void) strncat(zc.zc_value, drrb->drr_toname+choplen, 1689 sizeof (zc.zc_value)); 1690 if (!zfs_name_valid(zc.zc_value, ZFS_TYPE_SNAPSHOT)) { 1691 zcmd_free_nvlists(&zc); 1692 return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf)); 1693 } 1694 1695 /* 1696 * Determine the name of the origin snapshot, store in zc_string. 1697 */ 1698 if (drrb->drr_flags & DRR_FLAG_CLONE) { 1699 if (guid_to_name(hdl, tosnap, 1700 drrb->drr_fromguid, zc.zc_string) != 0) { 1701 zcmd_free_nvlists(&zc); 1702 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 1703 "local origin for clone %s does not exist"), 1704 zc.zc_value); 1705 return (zfs_error(hdl, EZFS_NOENT, errbuf)); 1706 } 1707 if (flags.verbose) 1708 (void) printf("found clone origin %s\n", zc.zc_string); 1709 } 1710 1711 stream_wantsnewfs = (drrb->drr_fromguid == NULL || 1712 (drrb->drr_flags & DRR_FLAG_CLONE)); 1713 1714 if (stream_wantsnewfs) { 1715 /* 1716 * if the parent fs does not exist, look for it based on 1717 * the parent snap GUID 1718 */ 1719 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN, 1720 "cannot receive new filesystem stream")); 1721 1722 (void) strcpy(zc.zc_name, zc.zc_value); 1723 cp = strrchr(zc.zc_name, '/'); 1724 if (cp) 1725 *cp = '\0'; 1726 if (cp && 1727 !zfs_dataset_exists(hdl, zc.zc_name, ZFS_TYPE_DATASET)) { 1728 char suffix[ZFS_MAXNAMELEN]; 1729 (void) strcpy(suffix, strrchr(zc.zc_value, '/')); 1730 if (guid_to_name(hdl, tosnap, parent_snapguid, 1731 zc.zc_value) == 0) { 1732 *strchr(zc.zc_value, '@') = '\0'; 1733 (void) strcat(zc.zc_value, suffix); 1734 } 1735 } 1736 } else { 1737 /* 1738 * if the fs does not exist, look for it based on the 1739 * fromsnap GUID 1740 */ 1741 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN, 1742 "cannot receive incremental stream")); 1743 1744 (void) strcpy(zc.zc_name, zc.zc_value); 1745 *strchr(zc.zc_name, '@') = '\0'; 1746 1747 if (!zfs_dataset_exists(hdl, zc.zc_name, ZFS_TYPE_DATASET)) { 1748 char snap[ZFS_MAXNAMELEN]; 1749 (void) strcpy(snap, strchr(zc.zc_value, '@')); 1750 if (guid_to_name(hdl, tosnap, drrb->drr_fromguid, 1751 zc.zc_value) == 0) { 1752 *strchr(zc.zc_value, '@') = '\0'; 1753 (void) strcat(zc.zc_value, snap); 1754 } 1755 } 1756 } 1757 1758 (void) strcpy(zc.zc_name, zc.zc_value); 1759 *strchr(zc.zc_name, '@') = '\0'; 1760 1761 if (zfs_dataset_exists(hdl, zc.zc_name, ZFS_TYPE_DATASET)) { 1762 zfs_handle_t *zhp; 1763 /* 1764 * Destination fs exists. Therefore this should either 1765 * be an incremental, or the stream specifies a new fs 1766 * (full stream or clone) and they want us to blow it 1767 * away (and have therefore specified -F and removed any 1768 * snapshots). 1769 */ 1770 1771 if (stream_wantsnewfs) { 1772 if (!flags.force) { 1773 zcmd_free_nvlists(&zc); 1774 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 1775 "destination '%s' exists\n" 1776 "must specify -F to overwrite it"), 1777 zc.zc_name); 1778 return (zfs_error(hdl, EZFS_EXISTS, errbuf)); 1779 } 1780 if (ioctl(hdl->libzfs_fd, ZFS_IOC_SNAPSHOT_LIST_NEXT, 1781 &zc) == 0) { 1782 zcmd_free_nvlists(&zc); 1783 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 1784 "destination has snapshots (eg. %s)\n" 1785 "must destroy them to overwrite it"), 1786 zc.zc_name); 1787 return (zfs_error(hdl, EZFS_EXISTS, errbuf)); 1788 } 1789 } 1790 1791 if ((zhp = zfs_open(hdl, zc.zc_name, 1792 ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME)) == NULL) { 1793 zcmd_free_nvlists(&zc); 1794 return (-1); 1795 } 1796 1797 if (stream_wantsnewfs && 1798 zhp->zfs_dmustats.dds_origin[0]) { 1799 zcmd_free_nvlists(&zc); 1800 zfs_close(zhp); 1801 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 1802 "destination '%s' is a clone\n" 1803 "must destroy it to overwrite it"), 1804 zc.zc_name); 1805 return (zfs_error(hdl, EZFS_EXISTS, errbuf)); 1806 } 1807 1808 if (!flags.dryrun && zhp->zfs_type == ZFS_TYPE_FILESYSTEM && 1809 stream_wantsnewfs) { 1810 /* We can't do online recv in this case */ 1811 clp = changelist_gather(zhp, ZFS_PROP_NAME, 0, 0); 1812 if (clp == NULL) { 1813 zfs_close(zhp); 1814 zcmd_free_nvlists(&zc); 1815 return (-1); 1816 } 1817 if (changelist_prefix(clp) != 0) { 1818 changelist_free(clp); 1819 zfs_close(zhp); 1820 zcmd_free_nvlists(&zc); 1821 return (-1); 1822 } 1823 } 1824 if (!flags.dryrun && zhp->zfs_type == ZFS_TYPE_VOLUME && 1825 zvol_remove_link(hdl, zhp->zfs_name) != 0) { 1826 zfs_close(zhp); 1827 zcmd_free_nvlists(&zc); 1828 return (-1); 1829 } 1830 zfs_close(zhp); 1831 } else { 1832 /* 1833 * Destination filesystem does not exist. Therefore we better 1834 * be creating a new filesystem (either from a full backup, or 1835 * a clone). It would therefore be invalid if the user 1836 * specified only the pool name (i.e. if the destination name 1837 * contained no slash character). 1838 */ 1839 if (!stream_wantsnewfs || 1840 (cp = strrchr(zc.zc_name, '/')) == NULL) { 1841 zcmd_free_nvlists(&zc); 1842 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 1843 "destination '%s' does not exist"), zc.zc_name); 1844 return (zfs_error(hdl, EZFS_NOENT, errbuf)); 1845 } 1846 1847 /* 1848 * Trim off the final dataset component so we perform the 1849 * recvbackup ioctl to the filesystems's parent. 1850 */ 1851 *cp = '\0'; 1852 1853 if (flags.isprefix && !flags.dryrun && 1854 create_parents(hdl, zc.zc_value, strlen(tosnap)) != 0) { 1855 zcmd_free_nvlists(&zc); 1856 return (zfs_error(hdl, EZFS_BADRESTORE, errbuf)); 1857 } 1858 1859 newfs = B_TRUE; 1860 } 1861 1862 zc.zc_begin_record = drr_noswap->drr_u.drr_begin; 1863 zc.zc_cookie = infd; 1864 zc.zc_guid = flags.force; 1865 if (flags.verbose) { 1866 (void) printf("%s %s stream of %s into %s\n", 1867 flags.dryrun ? "would receive" : "receiving", 1868 drrb->drr_fromguid ? "incremental" : "full", 1869 drrb->drr_toname, zc.zc_value); 1870 (void) fflush(stdout); 1871 } 1872 1873 if (flags.dryrun) { 1874 zcmd_free_nvlists(&zc); 1875 return (recv_skip(hdl, infd, flags.byteswap)); 1876 } 1877 1878 err = ioctl_err = zfs_ioctl(hdl, ZFS_IOC_RECV, &zc); 1879 ioctl_errno = errno; 1880 zcmd_free_nvlists(&zc); 1881 1882 if (err == 0 && snapprops_nvlist) { 1883 zfs_cmd_t zc2 = { 0 }; 1884 1885 (void) strcpy(zc2.zc_name, zc.zc_value); 1886 if (zcmd_write_src_nvlist(hdl, &zc2, snapprops_nvlist) == 0) { 1887 (void) zfs_ioctl(hdl, ZFS_IOC_SET_PROP, &zc2); 1888 zcmd_free_nvlists(&zc2); 1889 } 1890 } 1891 1892 if (err && (ioctl_errno == ENOENT || ioctl_errno == ENODEV)) { 1893 /* 1894 * It may be that this snapshot already exists, 1895 * in which case we want to consume & ignore it 1896 * rather than failing. 1897 */ 1898 avl_tree_t *local_avl; 1899 nvlist_t *local_nv, *fs; 1900 char *cp = strchr(zc.zc_value, '@'); 1901 1902 /* 1903 * XXX Do this faster by just iterating over snaps in 1904 * this fs. Also if zc_value does not exist, we will 1905 * get a strange "does not exist" error message. 1906 */ 1907 *cp = '\0'; 1908 if (gather_nvlist(hdl, zc.zc_value, NULL, NULL, 1909 &local_nv, &local_avl) == 0) { 1910 *cp = '@'; 1911 fs = fsavl_find(local_avl, drrb->drr_toguid, NULL); 1912 fsavl_destroy(local_avl); 1913 nvlist_free(local_nv); 1914 1915 if (fs != NULL) { 1916 if (flags.verbose) { 1917 (void) printf("snap %s already exists; " 1918 "ignoring\n", zc.zc_value); 1919 } 1920 ioctl_err = recv_skip(hdl, infd, 1921 flags.byteswap); 1922 } 1923 } 1924 *cp = '@'; 1925 } 1926 1927 1928 if (ioctl_err != 0) { 1929 switch (ioctl_errno) { 1930 case ENODEV: 1931 cp = strchr(zc.zc_value, '@'); 1932 *cp = '\0'; 1933 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 1934 "most recent snapshot of %s does not\n" 1935 "match incremental source"), zc.zc_value); 1936 (void) zfs_error(hdl, EZFS_BADRESTORE, errbuf); 1937 *cp = '@'; 1938 break; 1939 case ETXTBSY: 1940 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 1941 "destination %s has been modified\n" 1942 "since most recent snapshot"), zc.zc_name); 1943 (void) zfs_error(hdl, EZFS_BADRESTORE, errbuf); 1944 break; 1945 case EEXIST: 1946 cp = strchr(zc.zc_value, '@'); 1947 if (newfs) { 1948 /* it's the containing fs that exists */ 1949 *cp = '\0'; 1950 } 1951 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 1952 "destination already exists")); 1953 (void) zfs_error_fmt(hdl, EZFS_EXISTS, 1954 dgettext(TEXT_DOMAIN, "cannot restore to %s"), 1955 zc.zc_value); 1956 *cp = '@'; 1957 break; 1958 case EINVAL: 1959 (void) zfs_error(hdl, EZFS_BADSTREAM, errbuf); 1960 break; 1961 case ECKSUM: 1962 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 1963 "invalid stream (checksum mismatch)")); 1964 (void) zfs_error(hdl, EZFS_BADSTREAM, errbuf); 1965 break; 1966 default: 1967 (void) zfs_standard_error(hdl, ioctl_errno, errbuf); 1968 } 1969 } 1970 1971 /* 1972 * Mount or recreate the /dev links for the target filesystem 1973 * (if created, or if we tore them down to do an incremental 1974 * restore), and the /dev links for the new snapshot (if 1975 * created). Also mount any children of the target filesystem 1976 * if we did a replication receive (indicated by stream_avl 1977 * being non-NULL). 1978 */ 1979 cp = strchr(zc.zc_value, '@'); 1980 if (cp && (ioctl_err == 0 || !newfs)) { 1981 zfs_handle_t *h; 1982 1983 *cp = '\0'; 1984 h = zfs_open(hdl, zc.zc_value, 1985 ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME); 1986 if (h != NULL) { 1987 if (h->zfs_type == ZFS_TYPE_VOLUME) { 1988 *cp = '@'; 1989 err = zvol_create_link(hdl, h->zfs_name); 1990 if (err == 0 && ioctl_err == 0) 1991 err = zvol_create_link(hdl, 1992 zc.zc_value); 1993 } else if (newfs || stream_avl) { 1994 /* 1995 * Track the first/top of hierarchy fs, 1996 * for mounting and sharing later. 1997 */ 1998 if (top_zfs && *top_zfs == NULL) 1999 *top_zfs = zfs_strdup(hdl, zc.zc_value); 2000 } 2001 zfs_close(h); 2002 } 2003 *cp = '@'; 2004 } 2005 2006 if (clp) { 2007 err |= changelist_postfix(clp); 2008 changelist_free(clp); 2009 } 2010 2011 if (err || ioctl_err) 2012 return (-1); 2013 2014 if (flags.verbose) { 2015 char buf1[64]; 2016 char buf2[64]; 2017 uint64_t bytes = zc.zc_cookie; 2018 time_t delta = time(NULL) - begin_time; 2019 if (delta == 0) 2020 delta = 1; 2021 zfs_nicenum(bytes, buf1, sizeof (buf1)); 2022 zfs_nicenum(bytes/delta, buf2, sizeof (buf1)); 2023 2024 (void) printf("received %sB stream in %lu seconds (%sB/sec)\n", 2025 buf1, delta, buf2); 2026 } 2027 2028 return (0); 2029} 2030 2031static int 2032zfs_receive_impl(libzfs_handle_t *hdl, const char *tosnap, recvflags_t flags, 2033 int infd, avl_tree_t *stream_avl, char **top_zfs) 2034{ 2035 int err; 2036 dmu_replay_record_t drr, drr_noswap; 2037 struct drr_begin *drrb = &drr.drr_u.drr_begin; 2038 char errbuf[1024]; 2039 zio_cksum_t zcksum = { 0 }; 2040 2041 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN, 2042 "cannot receive")); 2043 2044 if (flags.isprefix && 2045 !zfs_dataset_exists(hdl, tosnap, ZFS_TYPE_DATASET)) { 2046 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "specified fs " 2047 "(%s) does not exist"), tosnap); 2048 return (zfs_error(hdl, EZFS_NOENT, errbuf)); 2049 } 2050 2051 /* read in the BEGIN record */ 2052 if (0 != (err = recv_read(hdl, infd, &drr, sizeof (drr), B_FALSE, 2053 &zcksum))) 2054 return (err); 2055 2056 if (drr.drr_type == DRR_END || drr.drr_type == BSWAP_32(DRR_END)) { 2057 /* It's the double end record at the end of a package */ 2058 return (ENODATA); 2059 } 2060 2061 /* the kernel needs the non-byteswapped begin record */ 2062 drr_noswap = drr; 2063 2064 flags.byteswap = B_FALSE; 2065 if (drrb->drr_magic == BSWAP_64(DMU_BACKUP_MAGIC)) { 2066 /* 2067 * We computed the checksum in the wrong byteorder in 2068 * recv_read() above; do it again correctly. 2069 */ 2070 bzero(&zcksum, sizeof (zio_cksum_t)); 2071 fletcher_4_incremental_byteswap(&drr, sizeof (drr), &zcksum); 2072 flags.byteswap = B_TRUE; 2073 2074 drr.drr_type = BSWAP_32(drr.drr_type); 2075 drr.drr_payloadlen = BSWAP_32(drr.drr_payloadlen); 2076 drrb->drr_magic = BSWAP_64(drrb->drr_magic); 2077 drrb->drr_version = BSWAP_64(drrb->drr_version); 2078 drrb->drr_creation_time = BSWAP_64(drrb->drr_creation_time); 2079 drrb->drr_type = BSWAP_32(drrb->drr_type); 2080 drrb->drr_flags = BSWAP_32(drrb->drr_flags); 2081 drrb->drr_toguid = BSWAP_64(drrb->drr_toguid); 2082 drrb->drr_fromguid = BSWAP_64(drrb->drr_fromguid); 2083 } 2084 2085 if (drrb->drr_magic != DMU_BACKUP_MAGIC || drr.drr_type != DRR_BEGIN) { 2086 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "invalid " 2087 "stream (bad magic number)")); 2088 return (zfs_error(hdl, EZFS_BADSTREAM, errbuf)); 2089 } 2090 2091 if (strchr(drrb->drr_toname, '@') == NULL) { 2092 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "invalid " 2093 "stream (bad snapshot name)")); 2094 return (zfs_error(hdl, EZFS_BADSTREAM, errbuf)); 2095 } 2096 2097 if (drrb->drr_version == DMU_BACKUP_STREAM_VERSION) { 2098 return (zfs_receive_one(hdl, infd, tosnap, flags, 2099 &drr, &drr_noswap, stream_avl, top_zfs)); 2100 } else if (drrb->drr_version == DMU_BACKUP_HEADER_VERSION) { 2101 return (zfs_receive_package(hdl, infd, tosnap, flags, 2102 &drr, &zcksum, top_zfs)); 2103 } else { 2104 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 2105 "stream is unsupported version %llu"), 2106 drrb->drr_version); 2107 return (zfs_error(hdl, EZFS_BADSTREAM, errbuf)); 2108 } 2109} 2110 2111/* 2112 * Restores a backup of tosnap from the file descriptor specified by infd. 2113 * Return 0 on total success, -2 if some things couldn't be 2114 * destroyed/renamed/promoted, -1 if some things couldn't be received. 2115 * (-1 will override -2). 2116 */ 2117int 2118zfs_receive(libzfs_handle_t *hdl, const char *tosnap, recvflags_t flags, 2119 int infd, avl_tree_t *stream_avl) 2120{ 2121 char *top_zfs = NULL; 2122 int err; 2123 2124 err = zfs_receive_impl(hdl, tosnap, flags, infd, stream_avl, &top_zfs); 2125 2126 if (err == 0 && !flags.nomount && top_zfs) { 2127 zfs_handle_t *zhp; 2128 prop_changelist_t *clp; 2129 2130 zhp = zfs_open(hdl, top_zfs, ZFS_TYPE_FILESYSTEM); 2131 if (zhp != NULL) { 2132 clp = changelist_gather(zhp, ZFS_PROP_MOUNTPOINT, 2133 CL_GATHER_MOUNT_ALWAYS, 0); 2134 zfs_close(zhp); 2135 if (clp != NULL) { 2136 /* mount and share received datasets */ 2137 err = changelist_postfix(clp); 2138 changelist_free(clp); 2139 } 2140 } 2141 if (zhp == NULL || clp == NULL || err) 2142 err = -1; 2143 } 2144 if (top_zfs) 2145 free(top_zfs); 2146 2147 return (err); 2148} 2149