1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2009 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #include <assert.h> 28 #include <ctype.h> 29 #include <errno.h> 30 #include <libdevinfo.h> 31 #include <libintl.h> 32 #include <stdio.h> 33 #include <stdlib.h> 34 #include <strings.h> 35 #include <unistd.h> 36 #include <stddef.h> 37 #include <fcntl.h> 38 #include <sys/mount.h> 39 #include <sys/mntent.h> 40 #include <sys/mnttab.h> 41 #include <sys/avl.h> 42 #include <stddef.h> 43 44 #include <libzfs.h> 45 46 #include "zfs_namecheck.h" 47 #include "zfs_prop.h" 48 #include "libzfs_impl.h" 49 50 #include <fletcher.c> /* XXX */ 51 52 static int zfs_receive_impl(libzfs_handle_t *, const char *, recvflags_t, 53 int, avl_tree_t *, char **); 54 55 /* 56 * Routines for dealing with the AVL tree of fs-nvlists 57 */ 58 typedef struct fsavl_node { 59 avl_node_t fn_node; 60 nvlist_t *fn_nvfs; 61 char *fn_snapname; 62 uint64_t fn_guid; 63 } fsavl_node_t; 64 65 static int 66 fsavl_compare(const void *arg1, const void *arg2) 67 { 68 const fsavl_node_t *fn1 = arg1; 69 const fsavl_node_t *fn2 = arg2; 70 71 if (fn1->fn_guid > fn2->fn_guid) 72 return (+1); 73 else if (fn1->fn_guid < fn2->fn_guid) 74 return (-1); 75 else 76 return (0); 77 } 78 79 /* 80 * Given the GUID of a snapshot, find its containing filesystem and 81 * (optionally) name. 82 */ 83 static nvlist_t * 84 fsavl_find(avl_tree_t *avl, uint64_t snapguid, char **snapname) 85 { 86 fsavl_node_t fn_find; 87 fsavl_node_t *fn; 88 89 fn_find.fn_guid = snapguid; 90 91 fn = avl_find(avl, &fn_find, NULL); 92 if (fn) { 93 if (snapname) 94 *snapname = fn->fn_snapname; 95 return (fn->fn_nvfs); 96 } 97 return (NULL); 98 } 99 100 static void 101 fsavl_destroy(avl_tree_t *avl) 102 { 103 fsavl_node_t *fn; 104 void *cookie; 105 106 if (avl == NULL) 107 return; 108 109 cookie = NULL; 110 while ((fn = avl_destroy_nodes(avl, &cookie)) != NULL) 111 free(fn); 112 avl_destroy(avl); 113 free(avl); 114 } 115 116 /* 117 * Given an nvlist, produce an avl tree of snapshots, ordered by guid 118 */ 119 static avl_tree_t * 120 fsavl_create(nvlist_t *fss) 121 { 122 avl_tree_t *fsavl; 123 nvpair_t *fselem = NULL; 124 125 if ((fsavl = malloc(sizeof (avl_tree_t))) == NULL) 126 return (NULL); 127 128 avl_create(fsavl, fsavl_compare, sizeof (fsavl_node_t), 129 offsetof(fsavl_node_t, fn_node)); 130 131 while ((fselem = nvlist_next_nvpair(fss, fselem)) != NULL) { 132 nvlist_t *nvfs, *snaps; 133 nvpair_t *snapelem = NULL; 134 135 VERIFY(0 == nvpair_value_nvlist(fselem, &nvfs)); 136 VERIFY(0 == nvlist_lookup_nvlist(nvfs, "snaps", &snaps)); 137 138 while ((snapelem = 139 nvlist_next_nvpair(snaps, snapelem)) != NULL) { 140 fsavl_node_t *fn; 141 uint64_t guid; 142 143 VERIFY(0 == nvpair_value_uint64(snapelem, &guid)); 144 if ((fn = malloc(sizeof (fsavl_node_t))) == NULL) { 145 fsavl_destroy(fsavl); 146 return (NULL); 147 } 148 fn->fn_nvfs = nvfs; 149 fn->fn_snapname = nvpair_name(snapelem); 150 fn->fn_guid = guid; 151 152 /* 153 * Note: if there are multiple snaps with the 154 * same GUID, we ignore all but one. 155 */ 156 if (avl_find(fsavl, fn, NULL) == NULL) 157 avl_add(fsavl, fn); 158 else 159 free(fn); 160 } 161 } 162 163 return (fsavl); 164 } 165 166 /* 167 * Routines for dealing with the giant nvlist of fs-nvlists, etc. 168 */ 169 typedef struct send_data { 170 uint64_t parent_fromsnap_guid; 171 nvlist_t *parent_snaps; 172 nvlist_t *fss; 173 nvlist_t *snapprops; 174 const char *fromsnap; 175 const char *tosnap; 176 177 /* 178 * The header nvlist is of the following format: 179 * { 180 * "tosnap" -> string 181 * "fromsnap" -> string (if incremental) 182 * "fss" -> { 183 * id -> { 184 * 185 * "name" -> string (full name; for debugging) 186 * "parentfromsnap" -> number (guid of fromsnap in parent) 187 * 188 * "props" -> { name -> value (only if set here) } 189 * "snaps" -> { name (lastname) -> number (guid) } 190 * "snapprops" -> { name (lastname) -> { name -> value } } 191 * 192 * "origin" -> number (guid) (if clone) 193 * "sent" -> boolean (not on-disk) 194 * } 195 * } 196 * } 197 * 198 */ 199 } send_data_t; 200 201 static void send_iterate_prop(zfs_handle_t *zhp, nvlist_t *nv); 202 203 static int 204 send_iterate_snap(zfs_handle_t *zhp, void *arg) 205 { 206 send_data_t *sd = arg; 207 uint64_t guid = zhp->zfs_dmustats.dds_guid; 208 char *snapname; 209 nvlist_t *nv; 210 211 snapname = strrchr(zhp->zfs_name, '@')+1; 212 213 VERIFY(0 == nvlist_add_uint64(sd->parent_snaps, snapname, guid)); 214 /* 215 * NB: if there is no fromsnap here (it's a newly created fs in 216 * an incremental replication), we will substitute the tosnap. 217 */ 218 if ((sd->fromsnap && strcmp(snapname, sd->fromsnap) == 0) || 219 (sd->parent_fromsnap_guid == 0 && sd->tosnap && 220 strcmp(snapname, sd->tosnap) == 0)) { 221 sd->parent_fromsnap_guid = guid; 222 } 223 224 VERIFY(0 == nvlist_alloc(&nv, NV_UNIQUE_NAME, 0)); 225 send_iterate_prop(zhp, nv); 226 VERIFY(0 == nvlist_add_nvlist(sd->snapprops, snapname, nv)); 227 nvlist_free(nv); 228 229 zfs_close(zhp); 230 return (0); 231 } 232 233 static void 234 send_iterate_prop(zfs_handle_t *zhp, nvlist_t *nv) 235 { 236 nvpair_t *elem = NULL; 237 238 while ((elem = nvlist_next_nvpair(zhp->zfs_props, elem)) != NULL) { 239 char *propname = nvpair_name(elem); 240 zfs_prop_t prop = zfs_name_to_prop(propname); 241 nvlist_t *propnv; 242 243 assert(zfs_prop_user(propname) || prop != ZPROP_INVAL); 244 245 if (!zfs_prop_user(propname) && zfs_prop_readonly(prop)) 246 continue; 247 248 verify(nvpair_value_nvlist(elem, &propnv) == 0); 249 if (prop == ZFS_PROP_QUOTA || prop == ZFS_PROP_RESERVATION || 250 prop == ZFS_PROP_REFQUOTA || 251 prop == ZFS_PROP_REFRESERVATION) { 252 /* these guys are modifyable, but have no source */ 253 uint64_t value; 254 verify(nvlist_lookup_uint64(propnv, 255 ZPROP_VALUE, &value) == 0); 256 if (zhp->zfs_type == ZFS_TYPE_SNAPSHOT) 257 continue; 258 } else { 259 char *source; 260 if (nvlist_lookup_string(propnv, 261 ZPROP_SOURCE, &source) != 0) 262 continue; 263 if (strcmp(source, zhp->zfs_name) != 0) 264 continue; 265 } 266 267 if (zfs_prop_user(propname) || 268 zfs_prop_get_type(prop) == PROP_TYPE_STRING) { 269 char *value; 270 verify(nvlist_lookup_string(propnv, 271 ZPROP_VALUE, &value) == 0); 272 VERIFY(0 == nvlist_add_string(nv, propname, value)); 273 } else { 274 uint64_t value; 275 verify(nvlist_lookup_uint64(propnv, 276 ZPROP_VALUE, &value) == 0); 277 VERIFY(0 == nvlist_add_uint64(nv, propname, value)); 278 } 279 } 280 } 281 282 /* 283 * recursively generate nvlists describing datasets. See comment 284 * for the data structure send_data_t above for description of contents 285 * of the nvlist. 286 */ 287 static int 288 send_iterate_fs(zfs_handle_t *zhp, void *arg) 289 { 290 send_data_t *sd = arg; 291 nvlist_t *nvfs, *nv; 292 int rv; 293 uint64_t parent_fromsnap_guid_save = sd->parent_fromsnap_guid; 294 uint64_t guid = zhp->zfs_dmustats.dds_guid; 295 char guidstring[64]; 296 297 VERIFY(0 == nvlist_alloc(&nvfs, NV_UNIQUE_NAME, 0)); 298 VERIFY(0 == nvlist_add_string(nvfs, "name", zhp->zfs_name)); 299 VERIFY(0 == nvlist_add_uint64(nvfs, "parentfromsnap", 300 sd->parent_fromsnap_guid)); 301 302 if (zhp->zfs_dmustats.dds_origin[0]) { 303 zfs_handle_t *origin = zfs_open(zhp->zfs_hdl, 304 zhp->zfs_dmustats.dds_origin, ZFS_TYPE_SNAPSHOT); 305 if (origin == NULL) 306 return (-1); 307 VERIFY(0 == nvlist_add_uint64(nvfs, "origin", 308 origin->zfs_dmustats.dds_guid)); 309 } 310 311 /* iterate over props */ 312 VERIFY(0 == nvlist_alloc(&nv, NV_UNIQUE_NAME, 0)); 313 send_iterate_prop(zhp, nv); 314 VERIFY(0 == nvlist_add_nvlist(nvfs, "props", nv)); 315 nvlist_free(nv); 316 317 /* iterate over snaps, and set sd->parent_fromsnap_guid */ 318 sd->parent_fromsnap_guid = 0; 319 VERIFY(0 == nvlist_alloc(&sd->parent_snaps, NV_UNIQUE_NAME, 0)); 320 VERIFY(0 == nvlist_alloc(&sd->snapprops, NV_UNIQUE_NAME, 0)); 321 (void) zfs_iter_snapshots(zhp, send_iterate_snap, sd); 322 VERIFY(0 == nvlist_add_nvlist(nvfs, "snaps", sd->parent_snaps)); 323 VERIFY(0 == nvlist_add_nvlist(nvfs, "snapprops", sd->snapprops)); 324 nvlist_free(sd->parent_snaps); 325 nvlist_free(sd->snapprops); 326 327 /* add this fs to nvlist */ 328 (void) snprintf(guidstring, sizeof (guidstring), 329 "0x%llx", (longlong_t)guid); 330 VERIFY(0 == nvlist_add_nvlist(sd->fss, guidstring, nvfs)); 331 nvlist_free(nvfs); 332 333 /* iterate over children */ 334 rv = zfs_iter_filesystems(zhp, send_iterate_fs, sd); 335 336 sd->parent_fromsnap_guid = parent_fromsnap_guid_save; 337 338 zfs_close(zhp); 339 return (rv); 340 } 341 342 static int 343 gather_nvlist(libzfs_handle_t *hdl, const char *fsname, const char *fromsnap, 344 const char *tosnap, nvlist_t **nvlp, avl_tree_t **avlp) 345 { 346 zfs_handle_t *zhp; 347 send_data_t sd = { 0 }; 348 int error; 349 350 zhp = zfs_open(hdl, fsname, ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME); 351 if (zhp == NULL) 352 return (EZFS_BADTYPE); 353 354 VERIFY(0 == nvlist_alloc(&sd.fss, NV_UNIQUE_NAME, 0)); 355 sd.fromsnap = fromsnap; 356 sd.tosnap = tosnap; 357 358 if ((error = send_iterate_fs(zhp, &sd)) != 0) { 359 nvlist_free(sd.fss); 360 if (avlp != NULL) 361 *avlp = NULL; 362 *nvlp = NULL; 363 return (error); 364 } 365 366 if (avlp != NULL && (*avlp = fsavl_create(sd.fss)) == NULL) { 367 nvlist_free(sd.fss); 368 *nvlp = NULL; 369 return (EZFS_NOMEM); 370 } 371 372 *nvlp = sd.fss; 373 return (0); 374 } 375 376 /* 377 * Routines for dealing with the sorted snapshot functionality 378 */ 379 typedef struct zfs_node { 380 zfs_handle_t *zn_handle; 381 avl_node_t zn_avlnode; 382 } zfs_node_t; 383 384 static int 385 zfs_sort_snaps(zfs_handle_t *zhp, void *data) 386 { 387 avl_tree_t *avl = data; 388 zfs_node_t *node = zfs_alloc(zhp->zfs_hdl, sizeof (zfs_node_t)); 389 390 node->zn_handle = zhp; 391 avl_add(avl, node); 392 return (0); 393 } 394 395 /* ARGSUSED */ 396 static int 397 zfs_snapshot_compare(const void *larg, const void *rarg) 398 { 399 zfs_handle_t *l = ((zfs_node_t *)larg)->zn_handle; 400 zfs_handle_t *r = ((zfs_node_t *)rarg)->zn_handle; 401 uint64_t lcreate, rcreate; 402 403 /* 404 * Sort them according to creation time. We use the hidden 405 * CREATETXG property to get an absolute ordering of snapshots. 406 */ 407 lcreate = zfs_prop_get_int(l, ZFS_PROP_CREATETXG); 408 rcreate = zfs_prop_get_int(r, ZFS_PROP_CREATETXG); 409 410 if (lcreate < rcreate) 411 return (-1); 412 else if (lcreate > rcreate) 413 return (+1); 414 else 415 return (0); 416 } 417 418 static int 419 zfs_iter_snapshots_sorted(zfs_handle_t *zhp, zfs_iter_f callback, void *data) 420 { 421 int ret = 0; 422 zfs_node_t *node; 423 avl_tree_t avl; 424 void *cookie = NULL; 425 426 avl_create(&avl, zfs_snapshot_compare, 427 sizeof (zfs_node_t), offsetof(zfs_node_t, zn_avlnode)); 428 429 ret = zfs_iter_snapshots(zhp, zfs_sort_snaps, &avl); 430 431 for (node = avl_first(&avl); node != NULL; node = AVL_NEXT(&avl, node)) 432 ret |= callback(node->zn_handle, data); 433 434 while ((node = avl_destroy_nodes(&avl, &cookie)) != NULL) 435 free(node); 436 437 avl_destroy(&avl); 438 439 return (ret); 440 } 441 442 /* 443 * Routines specific to "zfs send" 444 */ 445 typedef struct send_dump_data { 446 /* these are all just the short snapname (the part after the @) */ 447 const char *fromsnap; 448 const char *tosnap; 449 char lastsnap[ZFS_MAXNAMELEN]; 450 boolean_t seenfrom, seento, replicate, doall, fromorigin; 451 boolean_t verbose; 452 int outfd; 453 boolean_t err; 454 nvlist_t *fss; 455 avl_tree_t *fsavl; 456 } send_dump_data_t; 457 458 /* 459 * Dumps a backup of the given snapshot (incremental from fromsnap if it's not 460 * NULL) to the file descriptor specified by outfd. 461 */ 462 static int 463 dump_ioctl(zfs_handle_t *zhp, const char *fromsnap, boolean_t fromorigin, 464 int outfd) 465 { 466 zfs_cmd_t zc = { 0 }; 467 libzfs_handle_t *hdl = zhp->zfs_hdl; 468 469 assert(zhp->zfs_type == ZFS_TYPE_SNAPSHOT); 470 assert(fromsnap == NULL || fromsnap[0] == '\0' || !fromorigin); 471 472 (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name)); 473 if (fromsnap) 474 (void) strlcpy(zc.zc_value, fromsnap, sizeof (zc.zc_value)); 475 zc.zc_cookie = outfd; 476 zc.zc_obj = fromorigin; 477 478 if (ioctl(zhp->zfs_hdl->libzfs_fd, ZFS_IOC_SEND, &zc) != 0) { 479 char errbuf[1024]; 480 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN, 481 "warning: cannot send '%s'"), zhp->zfs_name); 482 483 switch (errno) { 484 485 case EXDEV: 486 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 487 "not an earlier snapshot from the same fs")); 488 return (zfs_error(hdl, EZFS_CROSSTARGET, errbuf)); 489 490 case ENOENT: 491 if (zfs_dataset_exists(hdl, zc.zc_name, 492 ZFS_TYPE_SNAPSHOT)) { 493 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 494 "incremental source (@%s) does not exist"), 495 zc.zc_value); 496 } 497 return (zfs_error(hdl, EZFS_NOENT, errbuf)); 498 499 case EDQUOT: 500 case EFBIG: 501 case EIO: 502 case ENOLINK: 503 case ENOSPC: 504 case ENOSTR: 505 case ENXIO: 506 case EPIPE: 507 case ERANGE: 508 case EFAULT: 509 case EROFS: 510 zfs_error_aux(hdl, strerror(errno)); 511 return (zfs_error(hdl, EZFS_BADBACKUP, errbuf)); 512 513 default: 514 return (zfs_standard_error(hdl, errno, errbuf)); 515 } 516 } 517 518 return (0); 519 } 520 521 static int 522 dump_snapshot(zfs_handle_t *zhp, void *arg) 523 { 524 send_dump_data_t *sdd = arg; 525 const char *thissnap; 526 int err; 527 528 thissnap = strchr(zhp->zfs_name, '@') + 1; 529 530 if (sdd->fromsnap && !sdd->seenfrom && 531 strcmp(sdd->fromsnap, thissnap) == 0) { 532 sdd->seenfrom = B_TRUE; 533 (void) strcpy(sdd->lastsnap, thissnap); 534 zfs_close(zhp); 535 return (0); 536 } 537 538 if (sdd->seento || !sdd->seenfrom) { 539 zfs_close(zhp); 540 return (0); 541 } 542 543 /* send it */ 544 if (sdd->verbose) { 545 (void) fprintf(stderr, "sending from @%s to %s\n", 546 sdd->lastsnap, zhp->zfs_name); 547 } 548 549 err = dump_ioctl(zhp, sdd->lastsnap, 550 sdd->lastsnap[0] == '\0' && (sdd->fromorigin || sdd->replicate), 551 sdd->outfd); 552 553 if (!sdd->seento && strcmp(sdd->tosnap, thissnap) == 0) 554 sdd->seento = B_TRUE; 555 556 (void) strcpy(sdd->lastsnap, thissnap); 557 zfs_close(zhp); 558 return (err); 559 } 560 561 static int 562 dump_filesystem(zfs_handle_t *zhp, void *arg) 563 { 564 int rv = 0; 565 send_dump_data_t *sdd = arg; 566 boolean_t missingfrom = B_FALSE; 567 zfs_cmd_t zc = { 0 }; 568 569 (void) snprintf(zc.zc_name, sizeof (zc.zc_name), "%s@%s", 570 zhp->zfs_name, sdd->tosnap); 571 if (ioctl(zhp->zfs_hdl->libzfs_fd, ZFS_IOC_OBJSET_STATS, &zc) != 0) { 572 (void) fprintf(stderr, "WARNING: " 573 "could not send %s@%s: does not exist\n", 574 zhp->zfs_name, sdd->tosnap); 575 sdd->err = B_TRUE; 576 return (0); 577 } 578 579 if (sdd->replicate && sdd->fromsnap) { 580 /* 581 * If this fs does not have fromsnap, and we're doing 582 * recursive, we need to send a full stream from the 583 * beginning (or an incremental from the origin if this 584 * is a clone). If we're doing non-recursive, then let 585 * them get the error. 586 */ 587 (void) snprintf(zc.zc_name, sizeof (zc.zc_name), "%s@%s", 588 zhp->zfs_name, sdd->fromsnap); 589 if (ioctl(zhp->zfs_hdl->libzfs_fd, 590 ZFS_IOC_OBJSET_STATS, &zc) != 0) { 591 missingfrom = B_TRUE; 592 } 593 } 594 595 if (sdd->doall) { 596 sdd->seenfrom = sdd->seento = sdd->lastsnap[0] = 0; 597 if (sdd->fromsnap == NULL || missingfrom) 598 sdd->seenfrom = B_TRUE; 599 600 rv = zfs_iter_snapshots_sorted(zhp, dump_snapshot, arg); 601 if (!sdd->seenfrom) { 602 (void) fprintf(stderr, 603 "WARNING: could not send %s@%s:\n" 604 "incremental source (%s@%s) does not exist\n", 605 zhp->zfs_name, sdd->tosnap, 606 zhp->zfs_name, sdd->fromsnap); 607 sdd->err = B_TRUE; 608 } else if (!sdd->seento) { 609 if (sdd->fromsnap) { 610 (void) fprintf(stderr, 611 "WARNING: could not send %s@%s:\n" 612 "incremental source (%s@%s) " 613 "is not earlier than it\n", 614 zhp->zfs_name, sdd->tosnap, 615 zhp->zfs_name, sdd->fromsnap); 616 } else { 617 (void) fprintf(stderr, "WARNING: " 618 "could not send %s@%s: does not exist\n", 619 zhp->zfs_name, sdd->tosnap); 620 } 621 sdd->err = B_TRUE; 622 } 623 } else { 624 zfs_handle_t *snapzhp; 625 char snapname[ZFS_MAXNAMELEN]; 626 627 (void) snprintf(snapname, sizeof (snapname), "%s@%s", 628 zfs_get_name(zhp), sdd->tosnap); 629 snapzhp = zfs_open(zhp->zfs_hdl, snapname, ZFS_TYPE_SNAPSHOT); 630 if (snapzhp == NULL) { 631 rv = -1; 632 } else { 633 rv = dump_ioctl(snapzhp, 634 missingfrom ? NULL : sdd->fromsnap, 635 sdd->fromorigin || missingfrom, 636 sdd->outfd); 637 sdd->seento = B_TRUE; 638 zfs_close(snapzhp); 639 } 640 } 641 642 return (rv); 643 } 644 645 static int 646 dump_filesystems(zfs_handle_t *rzhp, void *arg) 647 { 648 send_dump_data_t *sdd = arg; 649 nvpair_t *fspair; 650 boolean_t needagain, progress; 651 652 if (!sdd->replicate) 653 return (dump_filesystem(rzhp, sdd)); 654 655 again: 656 needagain = progress = B_FALSE; 657 for (fspair = nvlist_next_nvpair(sdd->fss, NULL); fspair; 658 fspair = nvlist_next_nvpair(sdd->fss, fspair)) { 659 nvlist_t *fslist; 660 char *fsname; 661 zfs_handle_t *zhp; 662 int err; 663 uint64_t origin_guid = 0; 664 nvlist_t *origin_nv; 665 666 VERIFY(nvpair_value_nvlist(fspair, &fslist) == 0); 667 if (nvlist_lookup_boolean(fslist, "sent") == 0) 668 continue; 669 670 VERIFY(nvlist_lookup_string(fslist, "name", &fsname) == 0); 671 (void) nvlist_lookup_uint64(fslist, "origin", &origin_guid); 672 673 origin_nv = fsavl_find(sdd->fsavl, origin_guid, NULL); 674 if (origin_nv && 675 nvlist_lookup_boolean(origin_nv, "sent") == ENOENT) { 676 /* 677 * origin has not been sent yet; 678 * skip this clone. 679 */ 680 needagain = B_TRUE; 681 continue; 682 } 683 684 zhp = zfs_open(rzhp->zfs_hdl, fsname, ZFS_TYPE_DATASET); 685 if (zhp == NULL) 686 return (-1); 687 err = dump_filesystem(zhp, sdd); 688 VERIFY(nvlist_add_boolean(fslist, "sent") == 0); 689 progress = B_TRUE; 690 zfs_close(zhp); 691 if (err) 692 return (err); 693 } 694 if (needagain) { 695 assert(progress); 696 goto again; 697 } 698 return (0); 699 } 700 701 /* 702 * Generate a send stream for the dataset identified by the argument zhp. 703 * 704 * The content of the send stream is the snapshot identified by 705 * 'tosnap'. Incremental streams are requested in two ways: 706 * - from the snapshot identified by "fromsnap" (if non-null) or 707 * - from the origin of the dataset identified by zhp, which must 708 * be a clone. In this case, "fromsnap" is null and "fromorigin" 709 * is TRUE. 710 * 711 * The send stream is recursive (i.e. dumps a hierarchy of snapshots) and 712 * uses a special header (with a version field of DMU_BACKUP_HEADER_VERSION) 713 * if "replicate" is set. If "doall" is set, dump all the intermediate 714 * snapshots. The DMU_BACKUP_HEADER_VERSION header is used in the "doall" 715 * case too. 716 */ 717 int 718 zfs_send(zfs_handle_t *zhp, const char *fromsnap, const char *tosnap, 719 boolean_t replicate, boolean_t doall, boolean_t fromorigin, 720 boolean_t verbose, int outfd) 721 { 722 char errbuf[1024]; 723 send_dump_data_t sdd = { 0 }; 724 int err; 725 nvlist_t *fss = NULL; 726 avl_tree_t *fsavl = NULL; 727 728 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN, 729 "cannot send '%s'"), zhp->zfs_name); 730 731 if (fromsnap && fromsnap[0] == '\0') { 732 zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN, 733 "zero-length incremental source")); 734 return (zfs_error(zhp->zfs_hdl, EZFS_NOENT, errbuf)); 735 } 736 737 if (replicate || doall) { 738 dmu_replay_record_t drr = { 0 }; 739 char *packbuf = NULL; 740 size_t buflen = 0; 741 zio_cksum_t zc = { 0 }; 742 743 assert(fromsnap || doall); 744 745 if (replicate) { 746 nvlist_t *hdrnv; 747 748 VERIFY(0 == nvlist_alloc(&hdrnv, NV_UNIQUE_NAME, 0)); 749 if (fromsnap) { 750 VERIFY(0 == nvlist_add_string(hdrnv, 751 "fromsnap", fromsnap)); 752 } 753 VERIFY(0 == nvlist_add_string(hdrnv, "tosnap", tosnap)); 754 755 err = gather_nvlist(zhp->zfs_hdl, zhp->zfs_name, 756 fromsnap, tosnap, &fss, &fsavl); 757 if (err) 758 return (err); 759 VERIFY(0 == nvlist_add_nvlist(hdrnv, "fss", fss)); 760 err = nvlist_pack(hdrnv, &packbuf, &buflen, 761 NV_ENCODE_XDR, 0); 762 nvlist_free(hdrnv); 763 if (err) { 764 fsavl_destroy(fsavl); 765 nvlist_free(fss); 766 return (zfs_standard_error(zhp->zfs_hdl, 767 err, errbuf)); 768 } 769 } 770 771 /* write first begin record */ 772 drr.drr_type = DRR_BEGIN; 773 drr.drr_u.drr_begin.drr_magic = DMU_BACKUP_MAGIC; 774 drr.drr_u.drr_begin.drr_version = DMU_BACKUP_HEADER_VERSION; 775 (void) snprintf(drr.drr_u.drr_begin.drr_toname, 776 sizeof (drr.drr_u.drr_begin.drr_toname), 777 "%s@%s", zhp->zfs_name, tosnap); 778 drr.drr_payloadlen = buflen; 779 fletcher_4_incremental_native(&drr, sizeof (drr), &zc); 780 err = write(outfd, &drr, sizeof (drr)); 781 782 /* write header nvlist */ 783 if (err != -1) { 784 fletcher_4_incremental_native(packbuf, buflen, &zc); 785 err = write(outfd, packbuf, buflen); 786 } 787 free(packbuf); 788 if (err == -1) { 789 fsavl_destroy(fsavl); 790 nvlist_free(fss); 791 return (zfs_standard_error(zhp->zfs_hdl, 792 errno, errbuf)); 793 } 794 795 /* write end record */ 796 if (err != -1) { 797 bzero(&drr, sizeof (drr)); 798 drr.drr_type = DRR_END; 799 drr.drr_u.drr_end.drr_checksum = zc; 800 err = write(outfd, &drr, sizeof (drr)); 801 if (err == -1) { 802 fsavl_destroy(fsavl); 803 nvlist_free(fss); 804 return (zfs_standard_error(zhp->zfs_hdl, 805 errno, errbuf)); 806 } 807 } 808 } 809 810 /* dump each stream */ 811 sdd.fromsnap = fromsnap; 812 sdd.tosnap = tosnap; 813 sdd.outfd = outfd; 814 sdd.replicate = replicate; 815 sdd.doall = doall; 816 sdd.fromorigin = fromorigin; 817 sdd.fss = fss; 818 sdd.fsavl = fsavl; 819 sdd.verbose = verbose; 820 err = dump_filesystems(zhp, &sdd); 821 fsavl_destroy(fsavl); 822 nvlist_free(fss); 823 824 if (replicate || doall) { 825 /* 826 * write final end record. NB: want to do this even if 827 * there was some error, because it might not be totally 828 * failed. 829 */ 830 dmu_replay_record_t drr = { 0 }; 831 drr.drr_type = DRR_END; 832 if (write(outfd, &drr, sizeof (drr)) == -1) { 833 return (zfs_standard_error(zhp->zfs_hdl, 834 errno, errbuf)); 835 } 836 } 837 838 return (err || sdd.err); 839 } 840 841 /* 842 * Routines specific to "zfs recv" 843 */ 844 845 static int 846 recv_read(libzfs_handle_t *hdl, int fd, void *buf, int ilen, 847 boolean_t byteswap, zio_cksum_t *zc) 848 { 849 char *cp = buf; 850 int rv; 851 int len = ilen; 852 853 do { 854 rv = read(fd, cp, len); 855 cp += rv; 856 len -= rv; 857 } while (rv > 0); 858 859 if (rv < 0 || len != 0) { 860 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 861 "failed to read from stream")); 862 return (zfs_error(hdl, EZFS_BADSTREAM, dgettext(TEXT_DOMAIN, 863 "cannot receive"))); 864 } 865 866 if (zc) { 867 if (byteswap) 868 fletcher_4_incremental_byteswap(buf, ilen, zc); 869 else 870 fletcher_4_incremental_native(buf, ilen, zc); 871 } 872 return (0); 873 } 874 875 static int 876 recv_read_nvlist(libzfs_handle_t *hdl, int fd, int len, nvlist_t **nvp, 877 boolean_t byteswap, zio_cksum_t *zc) 878 { 879 char *buf; 880 int err; 881 882 buf = zfs_alloc(hdl, len); 883 if (buf == NULL) 884 return (ENOMEM); 885 886 err = recv_read(hdl, fd, buf, len, byteswap, zc); 887 if (err != 0) { 888 free(buf); 889 return (err); 890 } 891 892 err = nvlist_unpack(buf, len, nvp, 0); 893 free(buf); 894 if (err != 0) { 895 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "invalid " 896 "stream (malformed nvlist)")); 897 return (EINVAL); 898 } 899 return (0); 900 } 901 902 static int 903 recv_rename(libzfs_handle_t *hdl, const char *name, const char *tryname, 904 int baselen, char *newname, recvflags_t flags) 905 { 906 static int seq; 907 zfs_cmd_t zc = { 0 }; 908 int err; 909 prop_changelist_t *clp; 910 zfs_handle_t *zhp; 911 912 zhp = zfs_open(hdl, name, ZFS_TYPE_DATASET); 913 if (zhp == NULL) 914 return (-1); 915 clp = changelist_gather(zhp, ZFS_PROP_NAME, 0, 916 flags.force ? MS_FORCE : 0); 917 zfs_close(zhp); 918 if (clp == NULL) 919 return (-1); 920 err = changelist_prefix(clp); 921 if (err) 922 return (err); 923 924 zc.zc_objset_type = DMU_OST_ZFS; 925 (void) strlcpy(zc.zc_name, name, sizeof (zc.zc_name)); 926 927 if (tryname) { 928 (void) strcpy(newname, tryname); 929 930 (void) strlcpy(zc.zc_value, tryname, sizeof (zc.zc_value)); 931 932 if (flags.verbose) { 933 (void) printf("attempting rename %s to %s\n", 934 zc.zc_name, zc.zc_value); 935 } 936 err = ioctl(hdl->libzfs_fd, ZFS_IOC_RENAME, &zc); 937 if (err == 0) 938 changelist_rename(clp, name, tryname); 939 } else { 940 err = ENOENT; 941 } 942 943 if (err != 0 && strncmp(name+baselen, "recv-", 5) != 0) { 944 seq++; 945 946 (void) strncpy(newname, name, baselen); 947 (void) snprintf(newname+baselen, ZFS_MAXNAMELEN-baselen, 948 "recv-%u-%u", getpid(), seq); 949 (void) strlcpy(zc.zc_value, newname, sizeof (zc.zc_value)); 950 951 if (flags.verbose) { 952 (void) printf("failed - trying rename %s to %s\n", 953 zc.zc_name, zc.zc_value); 954 } 955 err = ioctl(hdl->libzfs_fd, ZFS_IOC_RENAME, &zc); 956 if (err == 0) 957 changelist_rename(clp, name, newname); 958 if (err && flags.verbose) { 959 (void) printf("failed (%u) - " 960 "will try again on next pass\n", errno); 961 } 962 err = EAGAIN; 963 } else if (flags.verbose) { 964 if (err == 0) 965 (void) printf("success\n"); 966 else 967 (void) printf("failed (%u)\n", errno); 968 } 969 970 (void) changelist_postfix(clp); 971 changelist_free(clp); 972 973 return (err); 974 } 975 976 static int 977 recv_destroy(libzfs_handle_t *hdl, const char *name, int baselen, 978 char *newname, recvflags_t flags) 979 { 980 zfs_cmd_t zc = { 0 }; 981 int err = 0; 982 prop_changelist_t *clp; 983 zfs_handle_t *zhp; 984 boolean_t defer = B_FALSE; 985 int spa_version; 986 987 zhp = zfs_open(hdl, name, ZFS_TYPE_DATASET); 988 if (zhp == NULL) 989 return (-1); 990 clp = changelist_gather(zhp, ZFS_PROP_NAME, 0, 991 flags.force ? MS_FORCE : 0); 992 if (zfs_get_type(zhp) == ZFS_TYPE_SNAPSHOT && 993 zfs_spa_version(zhp, &spa_version) == 0 && 994 spa_version >= SPA_VERSION_USERREFS) 995 defer = B_TRUE; 996 zfs_close(zhp); 997 if (clp == NULL) 998 return (-1); 999 err = changelist_prefix(clp); 1000 if (err) 1001 return (err); 1002 1003 zc.zc_objset_type = DMU_OST_ZFS; 1004 zc.zc_defer_destroy = defer; 1005 (void) strlcpy(zc.zc_name, name, sizeof (zc.zc_name)); 1006 1007 if (flags.verbose) 1008 (void) printf("attempting destroy %s\n", zc.zc_name); 1009 err = ioctl(hdl->libzfs_fd, ZFS_IOC_DESTROY, &zc); 1010 if (err == 0) { 1011 if (flags.verbose) 1012 (void) printf("success\n"); 1013 changelist_remove(clp, zc.zc_name); 1014 } 1015 1016 (void) changelist_postfix(clp); 1017 changelist_free(clp); 1018 1019 /* 1020 * Deferred destroy should always succeed. Since we can't tell 1021 * if it destroyed the dataset or just marked it for deferred 1022 * destroy, always do the rename just in case. 1023 */ 1024 if (err != 0 || defer) 1025 err = recv_rename(hdl, name, NULL, baselen, newname, flags); 1026 1027 return (err); 1028 } 1029 1030 typedef struct guid_to_name_data { 1031 uint64_t guid; 1032 char *name; 1033 } guid_to_name_data_t; 1034 1035 static int 1036 guid_to_name_cb(zfs_handle_t *zhp, void *arg) 1037 { 1038 guid_to_name_data_t *gtnd = arg; 1039 int err; 1040 1041 if (zhp->zfs_dmustats.dds_guid == gtnd->guid) { 1042 (void) strcpy(gtnd->name, zhp->zfs_name); 1043 return (EEXIST); 1044 } 1045 err = zfs_iter_children(zhp, guid_to_name_cb, gtnd); 1046 zfs_close(zhp); 1047 return (err); 1048 } 1049 1050 static int 1051 guid_to_name(libzfs_handle_t *hdl, const char *parent, uint64_t guid, 1052 char *name) 1053 { 1054 /* exhaustive search all local snapshots */ 1055 guid_to_name_data_t gtnd; 1056 int err = 0; 1057 zfs_handle_t *zhp; 1058 char *cp; 1059 1060 gtnd.guid = guid; 1061 gtnd.name = name; 1062 1063 if (strchr(parent, '@') == NULL) { 1064 zhp = make_dataset_handle(hdl, parent); 1065 if (zhp != NULL) { 1066 err = zfs_iter_children(zhp, guid_to_name_cb, >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 */ 1092 static int 1093 created_before(libzfs_handle_t *hdl, avl_tree_t *avl, 1094 uint64_t guid1, uint64_t guid2) 1095 { 1096 nvlist_t *nvfs; 1097 char *fsname, *snapname; 1098 char buf[ZFS_MAXNAMELEN]; 1099 int rv; 1100 zfs_node_t zn1, zn2; 1101 1102 if (guid2 == 0) 1103 return (0); 1104 if (guid1 == 0) 1105 return (1); 1106 1107 nvfs = fsavl_find(avl, guid1, &snapname); 1108 VERIFY(0 == nvlist_lookup_string(nvfs, "name", &fsname)); 1109 (void) snprintf(buf, sizeof (buf), "%s@%s", fsname, snapname); 1110 zn1.zn_handle = zfs_open(hdl, buf, ZFS_TYPE_SNAPSHOT); 1111 if (zn1.zn_handle == NULL) 1112 return (-1); 1113 1114 nvfs = fsavl_find(avl, guid2, &snapname); 1115 VERIFY(0 == nvlist_lookup_string(nvfs, "name", &fsname)); 1116 (void) snprintf(buf, sizeof (buf), "%s@%s", fsname, snapname); 1117 zn2.zn_handle = zfs_open(hdl, buf, ZFS_TYPE_SNAPSHOT); 1118 if (zn2.zn_handle == NULL) { 1119 zfs_close(zn2.zn_handle); 1120 return (-1); 1121 } 1122 1123 rv = (zfs_snapshot_compare(&zn1, &zn2) == -1); 1124 1125 zfs_close(zn1.zn_handle); 1126 zfs_close(zn2.zn_handle); 1127 1128 return (rv); 1129 } 1130 1131 static int 1132 recv_incremental_replication(libzfs_handle_t *hdl, const char *tofs, 1133 recvflags_t flags, nvlist_t *stream_nv, avl_tree_t *stream_avl) 1134 { 1135 nvlist_t *local_nv; 1136 avl_tree_t *local_avl; 1137 nvpair_t *fselem, *nextfselem; 1138 char *tosnap, *fromsnap; 1139 char newname[ZFS_MAXNAMELEN]; 1140 int error; 1141 boolean_t needagain, progress; 1142 1143 VERIFY(0 == nvlist_lookup_string(stream_nv, "fromsnap", &fromsnap)); 1144 VERIFY(0 == nvlist_lookup_string(stream_nv, "tosnap", &tosnap)); 1145 1146 if (flags.dryrun) 1147 return (0); 1148 1149 again: 1150 needagain = progress = B_FALSE; 1151 1152 if ((error = gather_nvlist(hdl, tofs, fromsnap, NULL, 1153 &local_nv, &local_avl)) != 0) 1154 return (error); 1155 1156 /* 1157 * Process deletes and renames 1158 */ 1159 for (fselem = nvlist_next_nvpair(local_nv, NULL); 1160 fselem; fselem = nextfselem) { 1161 nvlist_t *nvfs, *snaps; 1162 nvlist_t *stream_nvfs = NULL; 1163 nvpair_t *snapelem, *nextsnapelem; 1164 uint64_t fromguid = 0; 1165 uint64_t originguid = 0; 1166 uint64_t stream_originguid = 0; 1167 uint64_t parent_fromsnap_guid, stream_parent_fromsnap_guid; 1168 char *fsname, *stream_fsname; 1169 1170 nextfselem = nvlist_next_nvpair(local_nv, fselem); 1171 1172 VERIFY(0 == nvpair_value_nvlist(fselem, &nvfs)); 1173 VERIFY(0 == nvlist_lookup_nvlist(nvfs, "snaps", &snaps)); 1174 VERIFY(0 == nvlist_lookup_string(nvfs, "name", &fsname)); 1175 VERIFY(0 == nvlist_lookup_uint64(nvfs, "parentfromsnap", 1176 &parent_fromsnap_guid)); 1177 (void) nvlist_lookup_uint64(nvfs, "origin", &originguid); 1178 1179 /* 1180 * First find the stream's fs, so we can check for 1181 * a different origin (due to "zfs promote") 1182 */ 1183 for (snapelem = nvlist_next_nvpair(snaps, NULL); 1184 snapelem; snapelem = nvlist_next_nvpair(snaps, snapelem)) { 1185 uint64_t thisguid; 1186 1187 VERIFY(0 == nvpair_value_uint64(snapelem, &thisguid)); 1188 stream_nvfs = fsavl_find(stream_avl, thisguid, NULL); 1189 1190 if (stream_nvfs != NULL) 1191 break; 1192 } 1193 1194 /* check for promote */ 1195 (void) nvlist_lookup_uint64(stream_nvfs, "origin", 1196 &stream_originguid); 1197 if (stream_nvfs && originguid != stream_originguid) { 1198 switch (created_before(hdl, local_avl, 1199 stream_originguid, originguid)) { 1200 case 1: { 1201 /* promote it! */ 1202 zfs_cmd_t zc = { 0 }; 1203 nvlist_t *origin_nvfs; 1204 char *origin_fsname; 1205 1206 if (flags.verbose) 1207 (void) printf("promoting %s\n", fsname); 1208 1209 origin_nvfs = fsavl_find(local_avl, originguid, 1210 NULL); 1211 VERIFY(0 == nvlist_lookup_string(origin_nvfs, 1212 "name", &origin_fsname)); 1213 (void) strlcpy(zc.zc_value, origin_fsname, 1214 sizeof (zc.zc_value)); 1215 (void) strlcpy(zc.zc_name, fsname, 1216 sizeof (zc.zc_name)); 1217 error = zfs_ioctl(hdl, ZFS_IOC_PROMOTE, &zc); 1218 if (error == 0) 1219 progress = B_TRUE; 1220 break; 1221 } 1222 default: 1223 break; 1224 case -1: 1225 fsavl_destroy(local_avl); 1226 nvlist_free(local_nv); 1227 return (-1); 1228 } 1229 /* 1230 * We had/have the wrong origin, therefore our 1231 * list of snapshots is wrong. Need to handle 1232 * them on the next pass. 1233 */ 1234 needagain = B_TRUE; 1235 continue; 1236 } 1237 1238 for (snapelem = nvlist_next_nvpair(snaps, NULL); 1239 snapelem; snapelem = nextsnapelem) { 1240 uint64_t thisguid; 1241 char *stream_snapname; 1242 nvlist_t *found, *props; 1243 1244 nextsnapelem = nvlist_next_nvpair(snaps, snapelem); 1245 1246 VERIFY(0 == nvpair_value_uint64(snapelem, &thisguid)); 1247 found = fsavl_find(stream_avl, thisguid, 1248 &stream_snapname); 1249 1250 /* check for delete */ 1251 if (found == NULL) { 1252 char name[ZFS_MAXNAMELEN]; 1253 1254 if (!flags.force) 1255 continue; 1256 1257 (void) snprintf(name, sizeof (name), "%s@%s", 1258 fsname, nvpair_name(snapelem)); 1259 1260 error = recv_destroy(hdl, name, 1261 strlen(fsname)+1, newname, flags); 1262 if (error) 1263 needagain = B_TRUE; 1264 else 1265 progress = B_TRUE; 1266 continue; 1267 } 1268 1269 stream_nvfs = found; 1270 1271 if (0 == nvlist_lookup_nvlist(stream_nvfs, "snapprops", 1272 &props) && 0 == nvlist_lookup_nvlist(props, 1273 stream_snapname, &props)) { 1274 zfs_cmd_t zc = { 0 }; 1275 1276 zc.zc_cookie = B_TRUE; /* clear current props */ 1277 (void) snprintf(zc.zc_name, sizeof (zc.zc_name), 1278 "%s@%s", fsname, nvpair_name(snapelem)); 1279 if (zcmd_write_src_nvlist(hdl, &zc, 1280 props) == 0) { 1281 (void) zfs_ioctl(hdl, 1282 ZFS_IOC_SET_PROP, &zc); 1283 zcmd_free_nvlists(&zc); 1284 } 1285 } 1286 1287 /* check for different snapname */ 1288 if (strcmp(nvpair_name(snapelem), 1289 stream_snapname) != 0) { 1290 char name[ZFS_MAXNAMELEN]; 1291 char tryname[ZFS_MAXNAMELEN]; 1292 1293 (void) snprintf(name, sizeof (name), "%s@%s", 1294 fsname, nvpair_name(snapelem)); 1295 (void) snprintf(tryname, sizeof (name), "%s@%s", 1296 fsname, stream_snapname); 1297 1298 error = recv_rename(hdl, name, tryname, 1299 strlen(fsname)+1, newname, flags); 1300 if (error) 1301 needagain = B_TRUE; 1302 else 1303 progress = B_TRUE; 1304 } 1305 1306 if (strcmp(stream_snapname, fromsnap) == 0) 1307 fromguid = thisguid; 1308 } 1309 1310 /* check for delete */ 1311 if (stream_nvfs == NULL) { 1312 if (!flags.force) 1313 continue; 1314 1315 error = recv_destroy(hdl, fsname, strlen(tofs)+1, 1316 newname, flags); 1317 if (error) 1318 needagain = B_TRUE; 1319 else 1320 progress = B_TRUE; 1321 continue; 1322 } 1323 1324 if (fromguid == 0 && flags.verbose) { 1325 (void) printf("local fs %s does not have fromsnap " 1326 "(%s in stream); must have been deleted locally; " 1327 "ignoring\n", fsname, fromsnap); 1328 continue; 1329 } 1330 1331 VERIFY(0 == nvlist_lookup_string(stream_nvfs, 1332 "name", &stream_fsname)); 1333 VERIFY(0 == nvlist_lookup_uint64(stream_nvfs, 1334 "parentfromsnap", &stream_parent_fromsnap_guid)); 1335 1336 /* check for rename */ 1337 if ((stream_parent_fromsnap_guid != 0 && 1338 stream_parent_fromsnap_guid != parent_fromsnap_guid) || 1339 strcmp(strrchr(fsname, '/'), 1340 strrchr(stream_fsname, '/')) != 0) { 1341 nvlist_t *parent; 1342 char tryname[ZFS_MAXNAMELEN]; 1343 1344 parent = fsavl_find(local_avl, 1345 stream_parent_fromsnap_guid, NULL); 1346 /* 1347 * NB: parent might not be found if we used the 1348 * tosnap for stream_parent_fromsnap_guid, 1349 * because the parent is a newly-created fs; 1350 * we'll be able to rename it after we recv the 1351 * new fs. 1352 */ 1353 if (parent != NULL) { 1354 char *pname; 1355 1356 VERIFY(0 == nvlist_lookup_string(parent, "name", 1357 &pname)); 1358 (void) snprintf(tryname, sizeof (tryname), 1359 "%s%s", pname, strrchr(stream_fsname, '/')); 1360 } else { 1361 tryname[0] = '\0'; 1362 if (flags.verbose) { 1363 (void) printf("local fs %s new parent " 1364 "not found\n", fsname); 1365 } 1366 } 1367 1368 error = recv_rename(hdl, fsname, tryname, 1369 strlen(tofs)+1, newname, flags); 1370 if (error) 1371 needagain = B_TRUE; 1372 else 1373 progress = B_TRUE; 1374 } 1375 } 1376 1377 fsavl_destroy(local_avl); 1378 nvlist_free(local_nv); 1379 1380 if (needagain && progress) { 1381 /* do another pass to fix up temporary names */ 1382 if (flags.verbose) 1383 (void) printf("another pass:\n"); 1384 goto again; 1385 } 1386 1387 return (needagain); 1388 } 1389 1390 static int 1391 zfs_receive_package(libzfs_handle_t *hdl, int fd, const char *destname, 1392 recvflags_t flags, dmu_replay_record_t *drr, zio_cksum_t *zc, 1393 char **top_zfs) 1394 { 1395 nvlist_t *stream_nv = NULL; 1396 avl_tree_t *stream_avl = NULL; 1397 char *fromsnap = NULL; 1398 char tofs[ZFS_MAXNAMELEN]; 1399 char errbuf[1024]; 1400 dmu_replay_record_t drre; 1401 int error; 1402 boolean_t anyerr = B_FALSE; 1403 boolean_t softerr = B_FALSE; 1404 1405 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN, 1406 "cannot receive")); 1407 1408 if (strchr(destname, '@')) { 1409 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 1410 "can not specify snapshot name for multi-snapshot stream")); 1411 return (zfs_error(hdl, EZFS_BADSTREAM, errbuf)); 1412 } 1413 1414 assert(drr->drr_type == DRR_BEGIN); 1415 assert(drr->drr_u.drr_begin.drr_magic == DMU_BACKUP_MAGIC); 1416 assert(drr->drr_u.drr_begin.drr_version == DMU_BACKUP_HEADER_VERSION); 1417 1418 /* 1419 * Read in the nvlist from the stream. 1420 */ 1421 if (drr->drr_payloadlen != 0) { 1422 if (!flags.isprefix) { 1423 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 1424 "must use -d to receive replication " 1425 "(send -R) stream")); 1426 return (zfs_error(hdl, EZFS_BADSTREAM, errbuf)); 1427 } 1428 1429 error = recv_read_nvlist(hdl, fd, drr->drr_payloadlen, 1430 &stream_nv, flags.byteswap, zc); 1431 if (error) { 1432 error = zfs_error(hdl, EZFS_BADSTREAM, errbuf); 1433 goto out; 1434 } 1435 } 1436 1437 /* 1438 * Read in the end record and verify checksum. 1439 */ 1440 if (0 != (error = recv_read(hdl, fd, &drre, sizeof (drre), 1441 flags.byteswap, NULL))) 1442 goto out; 1443 if (flags.byteswap) { 1444 drre.drr_type = BSWAP_32(drre.drr_type); 1445 drre.drr_u.drr_end.drr_checksum.zc_word[0] = 1446 BSWAP_64(drre.drr_u.drr_end.drr_checksum.zc_word[0]); 1447 drre.drr_u.drr_end.drr_checksum.zc_word[1] = 1448 BSWAP_64(drre.drr_u.drr_end.drr_checksum.zc_word[1]); 1449 drre.drr_u.drr_end.drr_checksum.zc_word[2] = 1450 BSWAP_64(drre.drr_u.drr_end.drr_checksum.zc_word[2]); 1451 drre.drr_u.drr_end.drr_checksum.zc_word[3] = 1452 BSWAP_64(drre.drr_u.drr_end.drr_checksum.zc_word[3]); 1453 } 1454 if (drre.drr_type != DRR_END) { 1455 error = zfs_error(hdl, EZFS_BADSTREAM, errbuf); 1456 goto out; 1457 } 1458 if (!ZIO_CHECKSUM_EQUAL(drre.drr_u.drr_end.drr_checksum, *zc)) { 1459 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 1460 "incorrect header checksum")); 1461 error = zfs_error(hdl, EZFS_BADSTREAM, errbuf); 1462 goto out; 1463 } 1464 1465 (void) nvlist_lookup_string(stream_nv, "fromsnap", &fromsnap); 1466 1467 if (drr->drr_payloadlen != 0) { 1468 nvlist_t *stream_fss; 1469 1470 VERIFY(0 == nvlist_lookup_nvlist(stream_nv, "fss", 1471 &stream_fss)); 1472 if ((stream_avl = fsavl_create(stream_fss)) == NULL) { 1473 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 1474 "couldn't allocate avl tree")); 1475 error = zfs_error(hdl, EZFS_NOMEM, errbuf); 1476 goto out; 1477 } 1478 1479 if (fromsnap != NULL) { 1480 (void) strlcpy(tofs, destname, ZFS_MAXNAMELEN); 1481 if (flags.isprefix) { 1482 int i = strcspn(drr->drr_u.drr_begin.drr_toname, 1483 "/@"); 1484 /* zfs_receive_one() will create_parents() */ 1485 (void) strlcat(tofs, 1486 &drr->drr_u.drr_begin.drr_toname[i], 1487 ZFS_MAXNAMELEN); 1488 *strchr(tofs, '@') = '\0'; 1489 } 1490 softerr = recv_incremental_replication(hdl, tofs, 1491 flags, stream_nv, stream_avl); 1492 } 1493 } 1494 1495 1496 /* Finally, receive each contained stream */ 1497 do { 1498 /* 1499 * we should figure out if it has a recoverable 1500 * error, in which case do a recv_skip() and drive on. 1501 * Note, if we fail due to already having this guid, 1502 * zfs_receive_one() will take care of it (ie, 1503 * recv_skip() and return 0). 1504 */ 1505 error = zfs_receive_impl(hdl, destname, flags, fd, 1506 stream_avl, top_zfs); 1507 if (error == ENODATA) { 1508 error = 0; 1509 break; 1510 } 1511 anyerr |= error; 1512 } while (error == 0); 1513 1514 if (drr->drr_payloadlen != 0 && fromsnap != NULL) { 1515 /* 1516 * Now that we have the fs's they sent us, try the 1517 * renames again. 1518 */ 1519 softerr = recv_incremental_replication(hdl, tofs, flags, 1520 stream_nv, stream_avl); 1521 } 1522 1523 out: 1524 fsavl_destroy(stream_avl); 1525 if (stream_nv) 1526 nvlist_free(stream_nv); 1527 if (softerr) 1528 error = -2; 1529 if (anyerr) 1530 error = -1; 1531 return (error); 1532 } 1533 1534 static int 1535 recv_skip(libzfs_handle_t *hdl, int fd, boolean_t byteswap) 1536 { 1537 dmu_replay_record_t *drr; 1538 void *buf = malloc(1<<20); 1539 1540 /* XXX would be great to use lseek if possible... */ 1541 drr = buf; 1542 1543 while (recv_read(hdl, fd, drr, sizeof (dmu_replay_record_t), 1544 byteswap, NULL) == 0) { 1545 if (byteswap) 1546 drr->drr_type = BSWAP_32(drr->drr_type); 1547 1548 switch (drr->drr_type) { 1549 case DRR_BEGIN: 1550 /* NB: not to be used on v2 stream packages */ 1551 assert(drr->drr_payloadlen == 0); 1552 break; 1553 1554 case DRR_END: 1555 free(buf); 1556 return (0); 1557 1558 case DRR_OBJECT: 1559 if (byteswap) { 1560 drr->drr_u.drr_object.drr_bonuslen = 1561 BSWAP_32(drr->drr_u.drr_object. 1562 drr_bonuslen); 1563 } 1564 (void) recv_read(hdl, fd, buf, 1565 P2ROUNDUP(drr->drr_u.drr_object.drr_bonuslen, 8), 1566 B_FALSE, NULL); 1567 break; 1568 1569 case DRR_WRITE: 1570 if (byteswap) { 1571 drr->drr_u.drr_write.drr_length = 1572 BSWAP_64(drr->drr_u.drr_write.drr_length); 1573 } 1574 (void) recv_read(hdl, fd, buf, 1575 drr->drr_u.drr_write.drr_length, B_FALSE, NULL); 1576 break; 1577 1578 case DRR_FREEOBJECTS: 1579 case DRR_FREE: 1580 break; 1581 1582 default: 1583 assert(!"invalid record type"); 1584 } 1585 } 1586 1587 free(buf); 1588 return (-1); 1589 } 1590 1591 /* 1592 * Restores a backup of tosnap from the file descriptor specified by infd. 1593 */ 1594 static int 1595 zfs_receive_one(libzfs_handle_t *hdl, int infd, const char *tosnap, 1596 recvflags_t flags, dmu_replay_record_t *drr, 1597 dmu_replay_record_t *drr_noswap, avl_tree_t *stream_avl, 1598 char **top_zfs) 1599 { 1600 zfs_cmd_t zc = { 0 }; 1601 time_t begin_time; 1602 int ioctl_err, ioctl_errno, err, choplen; 1603 char *cp; 1604 struct drr_begin *drrb = &drr->drr_u.drr_begin; 1605 char errbuf[1024]; 1606 char chopprefix[ZFS_MAXNAMELEN]; 1607 boolean_t newfs = B_FALSE; 1608 boolean_t stream_wantsnewfs; 1609 uint64_t parent_snapguid = 0; 1610 prop_changelist_t *clp = NULL; 1611 nvlist_t *snapprops_nvlist = NULL; 1612 1613 begin_time = time(NULL); 1614 1615 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN, 1616 "cannot receive")); 1617 1618 if (stream_avl != NULL) { 1619 char *snapname; 1620 nvlist_t *fs = fsavl_find(stream_avl, drrb->drr_toguid, 1621 &snapname); 1622 nvlist_t *props; 1623 int ret; 1624 1625 (void) nvlist_lookup_uint64(fs, "parentfromsnap", 1626 &parent_snapguid); 1627 err = nvlist_lookup_nvlist(fs, "props", &props); 1628 if (err) 1629 VERIFY(0 == nvlist_alloc(&props, NV_UNIQUE_NAME, 0)); 1630 1631 if (flags.canmountoff) { 1632 VERIFY(0 == nvlist_add_uint64(props, 1633 zfs_prop_to_name(ZFS_PROP_CANMOUNT), 0)); 1634 } 1635 ret = zcmd_write_src_nvlist(hdl, &zc, props); 1636 if (err) 1637 nvlist_free(props); 1638 1639 if (0 == nvlist_lookup_nvlist(fs, "snapprops", &props)) { 1640 VERIFY(0 == nvlist_lookup_nvlist(props, 1641 snapname, &snapprops_nvlist)); 1642 } 1643 1644 if (ret != 0) 1645 return (-1); 1646 } 1647 1648 /* 1649 * Determine how much of the snapshot name stored in the stream 1650 * we are going to tack on to the name they specified on the 1651 * command line, and how much we are going to chop off. 1652 * 1653 * If they specified a snapshot, chop the entire name stored in 1654 * the stream. 1655 */ 1656 (void) strcpy(chopprefix, drrb->drr_toname); 1657 if (flags.isprefix) { 1658 /* 1659 * They specified a fs with -d, we want to tack on 1660 * everything but the pool name stored in the stream 1661 */ 1662 if (strchr(tosnap, '@')) { 1663 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "invalid " 1664 "argument - snapshot not allowed with -d")); 1665 return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf)); 1666 } 1667 cp = strchr(chopprefix, '/'); 1668 if (cp == NULL) 1669 cp = strchr(chopprefix, '@'); 1670 *cp = '\0'; 1671 } else if (strchr(tosnap, '@') == NULL) { 1672 /* 1673 * If they specified a filesystem without -d, we want to 1674 * tack on everything after the fs specified in the 1675 * first name from the stream. 1676 */ 1677 cp = strchr(chopprefix, '@'); 1678 *cp = '\0'; 1679 } 1680 choplen = strlen(chopprefix); 1681 1682 /* 1683 * Determine name of destination snapshot, store in zc_value. 1684 */ 1685 (void) strcpy(zc.zc_value, tosnap); 1686 (void) strncat(zc.zc_value, drrb->drr_toname+choplen, 1687 sizeof (zc.zc_value)); 1688 if (!zfs_name_valid(zc.zc_value, ZFS_TYPE_SNAPSHOT)) { 1689 zcmd_free_nvlists(&zc); 1690 return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf)); 1691 } 1692 1693 /* 1694 * Determine the name of the origin snapshot, store in zc_string. 1695 */ 1696 if (drrb->drr_flags & DRR_FLAG_CLONE) { 1697 if (guid_to_name(hdl, tosnap, 1698 drrb->drr_fromguid, zc.zc_string) != 0) { 1699 zcmd_free_nvlists(&zc); 1700 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 1701 "local origin for clone %s does not exist"), 1702 zc.zc_value); 1703 return (zfs_error(hdl, EZFS_NOENT, errbuf)); 1704 } 1705 if (flags.verbose) 1706 (void) printf("found clone origin %s\n", zc.zc_string); 1707 } 1708 1709 stream_wantsnewfs = (drrb->drr_fromguid == NULL || 1710 (drrb->drr_flags & DRR_FLAG_CLONE)); 1711 1712 if (stream_wantsnewfs) { 1713 /* 1714 * if the parent fs does not exist, look for it based on 1715 * the parent snap GUID 1716 */ 1717 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN, 1718 "cannot receive new filesystem stream")); 1719 1720 (void) strcpy(zc.zc_name, zc.zc_value); 1721 cp = strrchr(zc.zc_name, '/'); 1722 if (cp) 1723 *cp = '\0'; 1724 if (cp && 1725 !zfs_dataset_exists(hdl, zc.zc_name, ZFS_TYPE_DATASET)) { 1726 char suffix[ZFS_MAXNAMELEN]; 1727 (void) strcpy(suffix, strrchr(zc.zc_value, '/')); 1728 if (guid_to_name(hdl, tosnap, parent_snapguid, 1729 zc.zc_value) == 0) { 1730 *strchr(zc.zc_value, '@') = '\0'; 1731 (void) strcat(zc.zc_value, suffix); 1732 } 1733 } 1734 } else { 1735 /* 1736 * if the fs does not exist, look for it based on the 1737 * fromsnap GUID 1738 */ 1739 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN, 1740 "cannot receive incremental stream")); 1741 1742 (void) strcpy(zc.zc_name, zc.zc_value); 1743 *strchr(zc.zc_name, '@') = '\0'; 1744 1745 if (!zfs_dataset_exists(hdl, zc.zc_name, ZFS_TYPE_DATASET)) { 1746 char snap[ZFS_MAXNAMELEN]; 1747 (void) strcpy(snap, strchr(zc.zc_value, '@')); 1748 if (guid_to_name(hdl, tosnap, drrb->drr_fromguid, 1749 zc.zc_value) == 0) { 1750 *strchr(zc.zc_value, '@') = '\0'; 1751 (void) strcat(zc.zc_value, snap); 1752 } 1753 } 1754 } 1755 1756 (void) strcpy(zc.zc_name, zc.zc_value); 1757 *strchr(zc.zc_name, '@') = '\0'; 1758 1759 if (zfs_dataset_exists(hdl, zc.zc_name, ZFS_TYPE_DATASET)) { 1760 zfs_handle_t *zhp; 1761 /* 1762 * Destination fs exists. Therefore this should either 1763 * be an incremental, or the stream specifies a new fs 1764 * (full stream or clone) and they want us to blow it 1765 * away (and have therefore specified -F and removed any 1766 * snapshots). 1767 */ 1768 1769 if (stream_wantsnewfs) { 1770 if (!flags.force) { 1771 zcmd_free_nvlists(&zc); 1772 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 1773 "destination '%s' exists\n" 1774 "must specify -F to overwrite it"), 1775 zc.zc_name); 1776 return (zfs_error(hdl, EZFS_EXISTS, errbuf)); 1777 } 1778 if (ioctl(hdl->libzfs_fd, ZFS_IOC_SNAPSHOT_LIST_NEXT, 1779 &zc) == 0) { 1780 zcmd_free_nvlists(&zc); 1781 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 1782 "destination has snapshots (eg. %s)\n" 1783 "must destroy them to overwrite it"), 1784 zc.zc_name); 1785 return (zfs_error(hdl, EZFS_EXISTS, errbuf)); 1786 } 1787 } 1788 1789 if ((zhp = zfs_open(hdl, zc.zc_name, 1790 ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME)) == NULL) { 1791 zcmd_free_nvlists(&zc); 1792 return (-1); 1793 } 1794 1795 if (stream_wantsnewfs && 1796 zhp->zfs_dmustats.dds_origin[0]) { 1797 zcmd_free_nvlists(&zc); 1798 zfs_close(zhp); 1799 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 1800 "destination '%s' is a clone\n" 1801 "must destroy it to overwrite it"), 1802 zc.zc_name); 1803 return (zfs_error(hdl, EZFS_EXISTS, errbuf)); 1804 } 1805 1806 if (!flags.dryrun && zhp->zfs_type == ZFS_TYPE_FILESYSTEM && 1807 stream_wantsnewfs) { 1808 /* We can't do online recv in this case */ 1809 clp = changelist_gather(zhp, ZFS_PROP_NAME, 0, 0); 1810 if (clp == NULL) { 1811 zfs_close(zhp); 1812 zcmd_free_nvlists(&zc); 1813 return (-1); 1814 } 1815 if (changelist_prefix(clp) != 0) { 1816 changelist_free(clp); 1817 zfs_close(zhp); 1818 zcmd_free_nvlists(&zc); 1819 return (-1); 1820 } 1821 } 1822 if (!flags.dryrun && zhp->zfs_type == ZFS_TYPE_VOLUME && 1823 zvol_remove_link(hdl, zhp->zfs_name) != 0) { 1824 zfs_close(zhp); 1825 zcmd_free_nvlists(&zc); 1826 return (-1); 1827 } 1828 zfs_close(zhp); 1829 } else { 1830 /* 1831 * Destination filesystem does not exist. Therefore we better 1832 * be creating a new filesystem (either from a full backup, or 1833 * a clone). It would therefore be invalid if the user 1834 * specified only the pool name (i.e. if the destination name 1835 * contained no slash character). 1836 */ 1837 if (!stream_wantsnewfs || 1838 (cp = strrchr(zc.zc_name, '/')) == NULL) { 1839 zcmd_free_nvlists(&zc); 1840 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 1841 "destination '%s' does not exist"), zc.zc_name); 1842 return (zfs_error(hdl, EZFS_NOENT, errbuf)); 1843 } 1844 1845 /* 1846 * Trim off the final dataset component so we perform the 1847 * recvbackup ioctl to the filesystems's parent. 1848 */ 1849 *cp = '\0'; 1850 1851 if (flags.isprefix && !flags.dryrun && 1852 create_parents(hdl, zc.zc_value, strlen(tosnap)) != 0) { 1853 zcmd_free_nvlists(&zc); 1854 return (zfs_error(hdl, EZFS_BADRESTORE, errbuf)); 1855 } 1856 1857 newfs = B_TRUE; 1858 } 1859 1860 zc.zc_begin_record = drr_noswap->drr_u.drr_begin; 1861 zc.zc_cookie = infd; 1862 zc.zc_guid = flags.force; 1863 if (flags.verbose) { 1864 (void) printf("%s %s stream of %s into %s\n", 1865 flags.dryrun ? "would receive" : "receiving", 1866 drrb->drr_fromguid ? "incremental" : "full", 1867 drrb->drr_toname, zc.zc_value); 1868 (void) fflush(stdout); 1869 } 1870 1871 if (flags.dryrun) { 1872 zcmd_free_nvlists(&zc); 1873 return (recv_skip(hdl, infd, flags.byteswap)); 1874 } 1875 1876 err = ioctl_err = zfs_ioctl(hdl, ZFS_IOC_RECV, &zc); 1877 ioctl_errno = errno; 1878 zcmd_free_nvlists(&zc); 1879 1880 if (err == 0 && snapprops_nvlist) { 1881 zfs_cmd_t zc2 = { 0 }; 1882 1883 (void) strcpy(zc2.zc_name, zc.zc_value); 1884 if (zcmd_write_src_nvlist(hdl, &zc2, snapprops_nvlist) == 0) { 1885 (void) zfs_ioctl(hdl, ZFS_IOC_SET_PROP, &zc2); 1886 zcmd_free_nvlists(&zc2); 1887 } 1888 } 1889 1890 if (err && (ioctl_errno == ENOENT || ioctl_errno == ENODEV)) { 1891 /* 1892 * It may be that this snapshot already exists, 1893 * in which case we want to consume & ignore it 1894 * rather than failing. 1895 */ 1896 avl_tree_t *local_avl; 1897 nvlist_t *local_nv, *fs; 1898 char *cp = strchr(zc.zc_value, '@'); 1899 1900 /* 1901 * XXX Do this faster by just iterating over snaps in 1902 * this fs. Also if zc_value does not exist, we will 1903 * get a strange "does not exist" error message. 1904 */ 1905 *cp = '\0'; 1906 if (gather_nvlist(hdl, zc.zc_value, NULL, NULL, 1907 &local_nv, &local_avl) == 0) { 1908 *cp = '@'; 1909 fs = fsavl_find(local_avl, drrb->drr_toguid, NULL); 1910 fsavl_destroy(local_avl); 1911 nvlist_free(local_nv); 1912 1913 if (fs != NULL) { 1914 if (flags.verbose) { 1915 (void) printf("snap %s already exists; " 1916 "ignoring\n", zc.zc_value); 1917 } 1918 ioctl_err = recv_skip(hdl, infd, 1919 flags.byteswap); 1920 } 1921 } 1922 *cp = '@'; 1923 } 1924 1925 1926 if (ioctl_err != 0) { 1927 switch (ioctl_errno) { 1928 case ENODEV: 1929 cp = strchr(zc.zc_value, '@'); 1930 *cp = '\0'; 1931 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 1932 "most recent snapshot of %s does not\n" 1933 "match incremental source"), zc.zc_value); 1934 (void) zfs_error(hdl, EZFS_BADRESTORE, errbuf); 1935 *cp = '@'; 1936 break; 1937 case ETXTBSY: 1938 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 1939 "destination %s has been modified\n" 1940 "since most recent snapshot"), zc.zc_name); 1941 (void) zfs_error(hdl, EZFS_BADRESTORE, errbuf); 1942 break; 1943 case EEXIST: 1944 cp = strchr(zc.zc_value, '@'); 1945 if (newfs) { 1946 /* it's the containing fs that exists */ 1947 *cp = '\0'; 1948 } 1949 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 1950 "destination already exists")); 1951 (void) zfs_error_fmt(hdl, EZFS_EXISTS, 1952 dgettext(TEXT_DOMAIN, "cannot restore to %s"), 1953 zc.zc_value); 1954 *cp = '@'; 1955 break; 1956 case EINVAL: 1957 (void) zfs_error(hdl, EZFS_BADSTREAM, errbuf); 1958 break; 1959 case ECKSUM: 1960 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 1961 "invalid stream (checksum mismatch)")); 1962 (void) zfs_error(hdl, EZFS_BADSTREAM, errbuf); 1963 break; 1964 default: 1965 (void) zfs_standard_error(hdl, ioctl_errno, errbuf); 1966 } 1967 } 1968 1969 /* 1970 * Mount or recreate the /dev links for the target filesystem 1971 * (if created, or if we tore them down to do an incremental 1972 * restore), and the /dev links for the new snapshot (if 1973 * created). Also mount any children of the target filesystem 1974 * if we did a replication receive (indicated by stream_avl 1975 * being non-NULL). 1976 */ 1977 cp = strchr(zc.zc_value, '@'); 1978 if (cp && (ioctl_err == 0 || !newfs)) { 1979 zfs_handle_t *h; 1980 1981 *cp = '\0'; 1982 h = zfs_open(hdl, zc.zc_value, 1983 ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME); 1984 if (h != NULL) { 1985 if (h->zfs_type == ZFS_TYPE_VOLUME) { 1986 *cp = '@'; 1987 err = zvol_create_link(hdl, h->zfs_name); 1988 if (err == 0 && ioctl_err == 0) 1989 err = zvol_create_link(hdl, 1990 zc.zc_value); 1991 } else if (newfs || stream_avl) { 1992 /* 1993 * Track the first/top of hierarchy fs, 1994 * for mounting and sharing later. 1995 */ 1996 if (top_zfs && *top_zfs == NULL) 1997 *top_zfs = zfs_strdup(hdl, zc.zc_value); 1998 } 1999 zfs_close(h); 2000 } 2001 *cp = '@'; 2002 } 2003 2004 if (clp) { 2005 err |= changelist_postfix(clp); 2006 changelist_free(clp); 2007 } 2008 2009 if (err || ioctl_err) 2010 return (-1); 2011 2012 if (flags.verbose) { 2013 char buf1[64]; 2014 char buf2[64]; 2015 uint64_t bytes = zc.zc_cookie; 2016 time_t delta = time(NULL) - begin_time; 2017 if (delta == 0) 2018 delta = 1; 2019 zfs_nicenum(bytes, buf1, sizeof (buf1)); 2020 zfs_nicenum(bytes/delta, buf2, sizeof (buf1)); 2021 2022 (void) printf("received %sB stream in %lu seconds (%sB/sec)\n", 2023 buf1, delta, buf2); 2024 } 2025 2026 return (0); 2027 } 2028 2029 static int 2030 zfs_receive_impl(libzfs_handle_t *hdl, const char *tosnap, recvflags_t flags, 2031 int infd, avl_tree_t *stream_avl, char **top_zfs) 2032 { 2033 int err; 2034 dmu_replay_record_t drr, drr_noswap; 2035 struct drr_begin *drrb = &drr.drr_u.drr_begin; 2036 char errbuf[1024]; 2037 zio_cksum_t zcksum = { 0 }; 2038 2039 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN, 2040 "cannot receive")); 2041 2042 if (flags.isprefix && 2043 !zfs_dataset_exists(hdl, tosnap, ZFS_TYPE_DATASET)) { 2044 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "specified fs " 2045 "(%s) does not exist"), tosnap); 2046 return (zfs_error(hdl, EZFS_NOENT, errbuf)); 2047 } 2048 2049 /* read in the BEGIN record */ 2050 if (0 != (err = recv_read(hdl, infd, &drr, sizeof (drr), B_FALSE, 2051 &zcksum))) 2052 return (err); 2053 2054 if (drr.drr_type == DRR_END || drr.drr_type == BSWAP_32(DRR_END)) { 2055 /* It's the double end record at the end of a package */ 2056 return (ENODATA); 2057 } 2058 2059 /* the kernel needs the non-byteswapped begin record */ 2060 drr_noswap = drr; 2061 2062 flags.byteswap = B_FALSE; 2063 if (drrb->drr_magic == BSWAP_64(DMU_BACKUP_MAGIC)) { 2064 /* 2065 * We computed the checksum in the wrong byteorder in 2066 * recv_read() above; do it again correctly. 2067 */ 2068 bzero(&zcksum, sizeof (zio_cksum_t)); 2069 fletcher_4_incremental_byteswap(&drr, sizeof (drr), &zcksum); 2070 flags.byteswap = B_TRUE; 2071 2072 drr.drr_type = BSWAP_32(drr.drr_type); 2073 drr.drr_payloadlen = BSWAP_32(drr.drr_payloadlen); 2074 drrb->drr_magic = BSWAP_64(drrb->drr_magic); 2075 drrb->drr_version = BSWAP_64(drrb->drr_version); 2076 drrb->drr_creation_time = BSWAP_64(drrb->drr_creation_time); 2077 drrb->drr_type = BSWAP_32(drrb->drr_type); 2078 drrb->drr_flags = BSWAP_32(drrb->drr_flags); 2079 drrb->drr_toguid = BSWAP_64(drrb->drr_toguid); 2080 drrb->drr_fromguid = BSWAP_64(drrb->drr_fromguid); 2081 } 2082 2083 if (drrb->drr_magic != DMU_BACKUP_MAGIC || drr.drr_type != DRR_BEGIN) { 2084 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "invalid " 2085 "stream (bad magic number)")); 2086 return (zfs_error(hdl, EZFS_BADSTREAM, errbuf)); 2087 } 2088 2089 if (strchr(drrb->drr_toname, '@') == NULL) { 2090 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "invalid " 2091 "stream (bad snapshot name)")); 2092 return (zfs_error(hdl, EZFS_BADSTREAM, errbuf)); 2093 } 2094 2095 if (drrb->drr_version == DMU_BACKUP_STREAM_VERSION) { 2096 return (zfs_receive_one(hdl, infd, tosnap, flags, 2097 &drr, &drr_noswap, stream_avl, top_zfs)); 2098 } else if (drrb->drr_version == DMU_BACKUP_HEADER_VERSION) { 2099 return (zfs_receive_package(hdl, infd, tosnap, flags, 2100 &drr, &zcksum, top_zfs)); 2101 } else { 2102 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 2103 "stream is unsupported version %llu"), 2104 drrb->drr_version); 2105 return (zfs_error(hdl, EZFS_BADSTREAM, errbuf)); 2106 } 2107 } 2108 2109 /* 2110 * Restores a backup of tosnap from the file descriptor specified by infd. 2111 * Return 0 on total success, -2 if some things couldn't be 2112 * destroyed/renamed/promoted, -1 if some things couldn't be received. 2113 * (-1 will override -2). 2114 */ 2115 int 2116 zfs_receive(libzfs_handle_t *hdl, const char *tosnap, recvflags_t flags, 2117 int infd, avl_tree_t *stream_avl) 2118 { 2119 char *top_zfs = NULL; 2120 int err; 2121 2122 err = zfs_receive_impl(hdl, tosnap, flags, infd, stream_avl, &top_zfs); 2123 2124 if (err == 0 && !flags.nomount && top_zfs) { 2125 zfs_handle_t *zhp; 2126 prop_changelist_t *clp; 2127 2128 zhp = zfs_open(hdl, top_zfs, ZFS_TYPE_FILESYSTEM); 2129 if (zhp != NULL) { 2130 clp = changelist_gather(zhp, ZFS_PROP_MOUNTPOINT, 2131 CL_GATHER_MOUNT_ALWAYS, 0); 2132 zfs_close(zhp); 2133 if (clp != NULL) { 2134 /* mount and share received datasets */ 2135 err = changelist_postfix(clp); 2136 changelist_free(clp); 2137 } 2138 } 2139 if (zhp == NULL || clp == NULL || err) 2140 err = -1; 2141 } 2142 if (top_zfs) 2143 free(top_zfs); 2144 2145 return (err); 2146 } 2147