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 (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 24 * Copyright (c) 2011, 2015 by Delphix. All rights reserved. 25 * Copyright (c) 2012, Joyent, Inc. All rights reserved. 26 * Copyright (c) 2012 Pawel Jakub Dawidek. All rights reserved. 27 * Copyright (c) 2013 Steven Hartland. All rights reserved. 28 * Copyright 2015, OmniTI Computer Consulting, Inc. All rights reserved. 29 * Copyright (c) 2014 Integros [integros.com] 30 * Copyright 2016 Igor Kozhukhov <ikozhukhov@gmail.com> 31 * Copyright (c) 2018, loli10K <ezomori.nozomu@gmail.com>. All rights reserved. 32 * Copyright (c) 2019 Datto Inc. 33 */ 34 35#include <assert.h> 36#include <ctype.h> 37#include <errno.h> 38#include <libintl.h> 39#include <stdio.h> 40#include <stdlib.h> 41#include <strings.h> 42#include <unistd.h> 43#include <stddef.h> 44#include <fcntl.h> 45#include <sys/param.h> 46#include <sys/mount.h> 47#include <pthread.h> 48#include <umem.h> 49#include <time.h> 50 51#include <libzfs.h> 52#include <libzfs_core.h> 53 54#include "zfs_namecheck.h" 55#include "zfs_prop.h" 56#include "zfs_fletcher.h" 57#include "libzfs_impl.h" 58#include <zlib.h> 59#include <sha2.h> 60#include <sys/zio_checksum.h> 61#include <sys/ddt.h> 62 63#ifdef __FreeBSD__ 64extern int zfs_ioctl_version; 65#endif 66 67/* in libzfs_dataset.c */ 68extern void zfs_setprop_error(libzfs_handle_t *, zfs_prop_t, int, char *); 69/* We need to use something for ENODATA. */ 70#define ENODATA EIDRM 71 72static int zfs_receive_impl(libzfs_handle_t *, const char *, const char *, 73 recvflags_t *, int, const char *, nvlist_t *, avl_tree_t *, char **, int, 74 uint64_t *, const char *); 75static int guid_to_name(libzfs_handle_t *, const char *, 76 uint64_t, boolean_t, char *); 77 78static const zio_cksum_t zero_cksum = { 0 }; 79 80typedef struct dedup_arg { 81 int inputfd; 82 int outputfd; 83 libzfs_handle_t *dedup_hdl; 84} dedup_arg_t; 85 86typedef struct progress_arg { 87 zfs_handle_t *pa_zhp; 88 int pa_fd; 89 boolean_t pa_parsable; 90 boolean_t pa_astitle; 91 uint64_t pa_size; 92} progress_arg_t; 93 94typedef struct dataref { 95 uint64_t ref_guid; 96 uint64_t ref_object; 97 uint64_t ref_offset; 98} dataref_t; 99 100typedef struct dedup_entry { 101 struct dedup_entry *dde_next; 102 zio_cksum_t dde_chksum; 103 uint64_t dde_prop; 104 dataref_t dde_ref; 105} dedup_entry_t; 106 107#define MAX_DDT_PHYSMEM_PERCENT 20 108#define SMALLEST_POSSIBLE_MAX_DDT_MB 128 109 110typedef struct dedup_table { 111 dedup_entry_t **dedup_hash_array; 112 umem_cache_t *ddecache; 113 uint64_t max_ddt_size; /* max dedup table size in bytes */ 114 uint64_t cur_ddt_size; /* current dedup table size in bytes */ 115 uint64_t ddt_count; 116 int numhashbits; 117 boolean_t ddt_full; 118} dedup_table_t; 119 120static int 121high_order_bit(uint64_t n) 122{ 123 int count; 124 125 for (count = 0; n != 0; count++) 126 n >>= 1; 127 return (count); 128} 129 130static size_t 131ssread(void *buf, size_t len, FILE *stream) 132{ 133 size_t outlen; 134 135 if ((outlen = fread(buf, len, 1, stream)) == 0) 136 return (0); 137 138 return (outlen); 139} 140 141static void 142ddt_hash_append(libzfs_handle_t *hdl, dedup_table_t *ddt, dedup_entry_t **ddepp, 143 zio_cksum_t *cs, uint64_t prop, dataref_t *dr) 144{ 145 dedup_entry_t *dde; 146 147 if (ddt->cur_ddt_size >= ddt->max_ddt_size) { 148 if (ddt->ddt_full == B_FALSE) { 149 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 150 "Dedup table full. Deduplication will continue " 151 "with existing table entries")); 152 ddt->ddt_full = B_TRUE; 153 } 154 return; 155 } 156 157 if ((dde = umem_cache_alloc(ddt->ddecache, UMEM_DEFAULT)) 158 != NULL) { 159 assert(*ddepp == NULL); 160 dde->dde_next = NULL; 161 dde->dde_chksum = *cs; 162 dde->dde_prop = prop; 163 dde->dde_ref = *dr; 164 *ddepp = dde; 165 ddt->cur_ddt_size += sizeof (dedup_entry_t); 166 ddt->ddt_count++; 167 } 168} 169 170/* 171 * Using the specified dedup table, do a lookup for an entry with 172 * the checksum cs. If found, return the block's reference info 173 * in *dr. Otherwise, insert a new entry in the dedup table, using 174 * the reference information specified by *dr. 175 * 176 * return value: true - entry was found 177 * false - entry was not found 178 */ 179static boolean_t 180ddt_update(libzfs_handle_t *hdl, dedup_table_t *ddt, zio_cksum_t *cs, 181 uint64_t prop, dataref_t *dr) 182{ 183 uint32_t hashcode; 184 dedup_entry_t **ddepp; 185 186 hashcode = BF64_GET(cs->zc_word[0], 0, ddt->numhashbits); 187 188 for (ddepp = &(ddt->dedup_hash_array[hashcode]); *ddepp != NULL; 189 ddepp = &((*ddepp)->dde_next)) { 190 if (ZIO_CHECKSUM_EQUAL(((*ddepp)->dde_chksum), *cs) && 191 (*ddepp)->dde_prop == prop) { 192 *dr = (*ddepp)->dde_ref; 193 return (B_TRUE); 194 } 195 } 196 ddt_hash_append(hdl, ddt, ddepp, cs, prop, dr); 197 return (B_FALSE); 198} 199 200static int 201dump_record(dmu_replay_record_t *drr, void *payload, int payload_len, 202 zio_cksum_t *zc, int outfd) 203{ 204 ASSERT3U(offsetof(dmu_replay_record_t, drr_u.drr_checksum.drr_checksum), 205 ==, sizeof (dmu_replay_record_t) - sizeof (zio_cksum_t)); 206 (void) fletcher_4_incremental_native(drr, 207 offsetof(dmu_replay_record_t, drr_u.drr_checksum.drr_checksum), zc); 208 if (drr->drr_type != DRR_BEGIN) { 209 ASSERT(ZIO_CHECKSUM_IS_ZERO(&drr->drr_u. 210 drr_checksum.drr_checksum)); 211 drr->drr_u.drr_checksum.drr_checksum = *zc; 212 } 213 (void) fletcher_4_incremental_native( 214 &drr->drr_u.drr_checksum.drr_checksum, sizeof (zio_cksum_t), zc); 215 if (write(outfd, drr, sizeof (*drr)) == -1) 216 return (errno); 217 if (payload_len != 0) { 218 (void) fletcher_4_incremental_native(payload, payload_len, zc); 219 if (write(outfd, payload, payload_len) == -1) 220 return (errno); 221 } 222 return (0); 223} 224 225/* 226 * This function is started in a separate thread when the dedup option 227 * has been requested. The main send thread determines the list of 228 * snapshots to be included in the send stream and makes the ioctl calls 229 * for each one. But instead of having the ioctl send the output to the 230 * the output fd specified by the caller of zfs_send()), the 231 * ioctl is told to direct the output to a pipe, which is read by the 232 * alternate thread running THIS function. This function does the 233 * dedup'ing by: 234 * 1. building a dedup table (the DDT) 235 * 2. doing checksums on each data block and inserting a record in the DDT 236 * 3. looking for matching checksums, and 237 * 4. sending a DRR_WRITE_BYREF record instead of a write record whenever 238 * a duplicate block is found. 239 * The output of this function then goes to the output fd requested 240 * by the caller of zfs_send(). 241 */ 242static void * 243cksummer(void *arg) 244{ 245 dedup_arg_t *dda = arg; 246 char *buf = zfs_alloc(dda->dedup_hdl, SPA_MAXBLOCKSIZE); 247 dmu_replay_record_t thedrr; 248 dmu_replay_record_t *drr = &thedrr; 249 FILE *ofp; 250 int outfd; 251 dedup_table_t ddt; 252 zio_cksum_t stream_cksum; 253 uint64_t physmem = sysconf(_SC_PHYS_PAGES) * sysconf(_SC_PAGESIZE); 254 uint64_t numbuckets; 255 256 ddt.max_ddt_size = 257 MAX((physmem * MAX_DDT_PHYSMEM_PERCENT) / 100, 258 SMALLEST_POSSIBLE_MAX_DDT_MB << 20); 259 260 numbuckets = ddt.max_ddt_size / (sizeof (dedup_entry_t)); 261 262 /* 263 * numbuckets must be a power of 2. Increase number to 264 * a power of 2 if necessary. 265 */ 266 if (!ISP2(numbuckets)) 267 numbuckets = 1 << high_order_bit(numbuckets); 268 269 ddt.dedup_hash_array = calloc(numbuckets, sizeof (dedup_entry_t *)); 270 ddt.ddecache = umem_cache_create("dde", sizeof (dedup_entry_t), 0, 271 NULL, NULL, NULL, NULL, NULL, 0); 272 ddt.cur_ddt_size = numbuckets * sizeof (dedup_entry_t *); 273 ddt.numhashbits = high_order_bit(numbuckets) - 1; 274 ddt.ddt_full = B_FALSE; 275 276 outfd = dda->outputfd; 277 ofp = fdopen(dda->inputfd, "r"); 278 while (ssread(drr, sizeof (*drr), ofp) != 0) { 279 280 /* 281 * kernel filled in checksum, we are going to write same 282 * record, but need to regenerate checksum. 283 */ 284 if (drr->drr_type != DRR_BEGIN) { 285 bzero(&drr->drr_u.drr_checksum.drr_checksum, 286 sizeof (drr->drr_u.drr_checksum.drr_checksum)); 287 } 288 289 switch (drr->drr_type) { 290 case DRR_BEGIN: 291 { 292 struct drr_begin *drrb = &drr->drr_u.drr_begin; 293 int fflags; 294 int sz = 0; 295 ZIO_SET_CHECKSUM(&stream_cksum, 0, 0, 0, 0); 296 297 ASSERT3U(drrb->drr_magic, ==, DMU_BACKUP_MAGIC); 298 299 /* set the DEDUP feature flag for this stream */ 300 fflags = DMU_GET_FEATUREFLAGS(drrb->drr_versioninfo); 301 fflags |= (DMU_BACKUP_FEATURE_DEDUP | 302 DMU_BACKUP_FEATURE_DEDUPPROPS); 303 DMU_SET_FEATUREFLAGS(drrb->drr_versioninfo, fflags); 304 305 if (drr->drr_payloadlen != 0) { 306 sz = drr->drr_payloadlen; 307 308 if (sz > SPA_MAXBLOCKSIZE) { 309 buf = zfs_realloc(dda->dedup_hdl, buf, 310 SPA_MAXBLOCKSIZE, sz); 311 } 312 (void) ssread(buf, sz, ofp); 313 if (ferror(stdin)) 314 perror("fread"); 315 } 316 if (dump_record(drr, buf, sz, &stream_cksum, 317 outfd) != 0) 318 goto out; 319 break; 320 } 321 322 case DRR_END: 323 { 324 struct drr_end *drre = &drr->drr_u.drr_end; 325 /* use the recalculated checksum */ 326 drre->drr_checksum = stream_cksum; 327 if (dump_record(drr, NULL, 0, &stream_cksum, 328 outfd) != 0) 329 goto out; 330 break; 331 } 332 333 case DRR_OBJECT: 334 { 335 struct drr_object *drro = &drr->drr_u.drr_object; 336 if (drro->drr_bonuslen > 0) { 337 (void) ssread(buf, 338 P2ROUNDUP((uint64_t)drro->drr_bonuslen, 8), 339 ofp); 340 } 341 if (dump_record(drr, buf, 342 P2ROUNDUP((uint64_t)drro->drr_bonuslen, 8), 343 &stream_cksum, outfd) != 0) 344 goto out; 345 break; 346 } 347 348 case DRR_SPILL: 349 { 350 struct drr_spill *drrs = &drr->drr_u.drr_spill; 351 (void) ssread(buf, drrs->drr_length, ofp); 352 if (dump_record(drr, buf, drrs->drr_length, 353 &stream_cksum, outfd) != 0) 354 goto out; 355 break; 356 } 357 358 case DRR_FREEOBJECTS: 359 { 360 if (dump_record(drr, NULL, 0, &stream_cksum, 361 outfd) != 0) 362 goto out; 363 break; 364 } 365 366 case DRR_WRITE: 367 { 368 struct drr_write *drrw = &drr->drr_u.drr_write; 369 dataref_t dataref; 370 uint64_t payload_size; 371 372 payload_size = DRR_WRITE_PAYLOAD_SIZE(drrw); 373 (void) ssread(buf, payload_size, ofp); 374 375 /* 376 * Use the existing checksum if it's dedup-capable, 377 * else calculate a SHA256 checksum for it. 378 */ 379 380 if (ZIO_CHECKSUM_EQUAL(drrw->drr_key.ddk_cksum, 381 zero_cksum) || 382 !DRR_IS_DEDUP_CAPABLE(drrw->drr_checksumflags)) { 383 SHA256_CTX ctx; 384 zio_cksum_t tmpsha256; 385 386 SHA256Init(&ctx); 387 SHA256Update(&ctx, buf, payload_size); 388 SHA256Final(&tmpsha256, &ctx); 389 drrw->drr_key.ddk_cksum.zc_word[0] = 390 BE_64(tmpsha256.zc_word[0]); 391 drrw->drr_key.ddk_cksum.zc_word[1] = 392 BE_64(tmpsha256.zc_word[1]); 393 drrw->drr_key.ddk_cksum.zc_word[2] = 394 BE_64(tmpsha256.zc_word[2]); 395 drrw->drr_key.ddk_cksum.zc_word[3] = 396 BE_64(tmpsha256.zc_word[3]); 397 drrw->drr_checksumtype = ZIO_CHECKSUM_SHA256; 398 drrw->drr_checksumflags = DRR_CHECKSUM_DEDUP; 399 } 400 401 dataref.ref_guid = drrw->drr_toguid; 402 dataref.ref_object = drrw->drr_object; 403 dataref.ref_offset = drrw->drr_offset; 404 405 if (ddt_update(dda->dedup_hdl, &ddt, 406 &drrw->drr_key.ddk_cksum, drrw->drr_key.ddk_prop, 407 &dataref)) { 408 dmu_replay_record_t wbr_drr = {0}; 409 struct drr_write_byref *wbr_drrr = 410 &wbr_drr.drr_u.drr_write_byref; 411 412 /* block already present in stream */ 413 wbr_drr.drr_type = DRR_WRITE_BYREF; 414 415 wbr_drrr->drr_object = drrw->drr_object; 416 wbr_drrr->drr_offset = drrw->drr_offset; 417 wbr_drrr->drr_length = drrw->drr_logical_size; 418 wbr_drrr->drr_toguid = drrw->drr_toguid; 419 wbr_drrr->drr_refguid = dataref.ref_guid; 420 wbr_drrr->drr_refobject = 421 dataref.ref_object; 422 wbr_drrr->drr_refoffset = 423 dataref.ref_offset; 424 425 wbr_drrr->drr_checksumtype = 426 drrw->drr_checksumtype; 427 wbr_drrr->drr_checksumflags = 428 drrw->drr_checksumtype; 429 wbr_drrr->drr_key.ddk_cksum = 430 drrw->drr_key.ddk_cksum; 431 wbr_drrr->drr_key.ddk_prop = 432 drrw->drr_key.ddk_prop; 433 434 if (dump_record(&wbr_drr, NULL, 0, 435 &stream_cksum, outfd) != 0) 436 goto out; 437 } else { 438 /* block not previously seen */ 439 if (dump_record(drr, buf, payload_size, 440 &stream_cksum, outfd) != 0) 441 goto out; 442 } 443 break; 444 } 445 446 case DRR_WRITE_EMBEDDED: 447 { 448 struct drr_write_embedded *drrwe = 449 &drr->drr_u.drr_write_embedded; 450 (void) ssread(buf, 451 P2ROUNDUP((uint64_t)drrwe->drr_psize, 8), ofp); 452 if (dump_record(drr, buf, 453 P2ROUNDUP((uint64_t)drrwe->drr_psize, 8), 454 &stream_cksum, outfd) != 0) 455 goto out; 456 break; 457 } 458 459 case DRR_FREE: 460 { 461 if (dump_record(drr, NULL, 0, &stream_cksum, 462 outfd) != 0) 463 goto out; 464 break; 465 } 466 467 default: 468 (void) fprintf(stderr, "INVALID record type 0x%x\n", 469 drr->drr_type); 470 /* should never happen, so assert */ 471 assert(B_FALSE); 472 } 473 } 474out: 475 umem_cache_destroy(ddt.ddecache); 476 free(ddt.dedup_hash_array); 477 free(buf); 478 (void) fclose(ofp); 479 480 return (NULL); 481} 482 483/* 484 * Routines for dealing with the AVL tree of fs-nvlists 485 */ 486typedef struct fsavl_node { 487 avl_node_t fn_node; 488 nvlist_t *fn_nvfs; 489 char *fn_snapname; 490 uint64_t fn_guid; 491} fsavl_node_t; 492 493static int 494fsavl_compare(const void *arg1, const void *arg2) 495{ 496 const fsavl_node_t *fn1 = (const fsavl_node_t *)arg1; 497 const fsavl_node_t *fn2 = (const fsavl_node_t *)arg2; 498 499 return (AVL_CMP(fn1->fn_guid, fn2->fn_guid)); 500} 501 502/* 503 * Given the GUID of a snapshot, find its containing filesystem and 504 * (optionally) name. 505 */ 506static nvlist_t * 507fsavl_find(avl_tree_t *avl, uint64_t snapguid, char **snapname) 508{ 509 fsavl_node_t fn_find; 510 fsavl_node_t *fn; 511 512 fn_find.fn_guid = snapguid; 513 514 fn = avl_find(avl, &fn_find, NULL); 515 if (fn) { 516 if (snapname) 517 *snapname = fn->fn_snapname; 518 return (fn->fn_nvfs); 519 } 520 return (NULL); 521} 522 523static void 524fsavl_destroy(avl_tree_t *avl) 525{ 526 fsavl_node_t *fn; 527 void *cookie; 528 529 if (avl == NULL) 530 return; 531 532 cookie = NULL; 533 while ((fn = avl_destroy_nodes(avl, &cookie)) != NULL) 534 free(fn); 535 avl_destroy(avl); 536 free(avl); 537} 538 539/* 540 * Given an nvlist, produce an avl tree of snapshots, ordered by guid 541 */ 542static avl_tree_t * 543fsavl_create(nvlist_t *fss) 544{ 545 avl_tree_t *fsavl; 546 nvpair_t *fselem = NULL; 547 548 if ((fsavl = malloc(sizeof (avl_tree_t))) == NULL) 549 return (NULL); 550 551 avl_create(fsavl, fsavl_compare, sizeof (fsavl_node_t), 552 offsetof(fsavl_node_t, fn_node)); 553 554 while ((fselem = nvlist_next_nvpair(fss, fselem)) != NULL) { 555 nvlist_t *nvfs, *snaps; 556 nvpair_t *snapelem = NULL; 557 558 VERIFY(0 == nvpair_value_nvlist(fselem, &nvfs)); 559 VERIFY(0 == nvlist_lookup_nvlist(nvfs, "snaps", &snaps)); 560 561 while ((snapelem = 562 nvlist_next_nvpair(snaps, snapelem)) != NULL) { 563 fsavl_node_t *fn; 564 uint64_t guid; 565 566 VERIFY(0 == nvpair_value_uint64(snapelem, &guid)); 567 if ((fn = malloc(sizeof (fsavl_node_t))) == NULL) { 568 fsavl_destroy(fsavl); 569 return (NULL); 570 } 571 fn->fn_nvfs = nvfs; 572 fn->fn_snapname = nvpair_name(snapelem); 573 fn->fn_guid = guid; 574 575 /* 576 * Note: if there are multiple snaps with the 577 * same GUID, we ignore all but one. 578 */ 579 if (avl_find(fsavl, fn, NULL) == NULL) 580 avl_add(fsavl, fn); 581 else 582 free(fn); 583 } 584 } 585 586 return (fsavl); 587} 588 589/* 590 * Routines for dealing with the giant nvlist of fs-nvlists, etc. 591 */ 592typedef struct send_data { 593 /* 594 * assigned inside every recursive call, 595 * restored from *_save on return: 596 * 597 * guid of fromsnap snapshot in parent dataset 598 * txg of fromsnap snapshot in current dataset 599 * txg of tosnap snapshot in current dataset 600 */ 601 602 uint64_t parent_fromsnap_guid; 603 uint64_t fromsnap_txg; 604 uint64_t tosnap_txg; 605 606 /* the nvlists get accumulated during depth-first traversal */ 607 nvlist_t *parent_snaps; 608 nvlist_t *fss; 609 nvlist_t *snapprops; 610 611 /* send-receive configuration, does not change during traversal */ 612 const char *fsname; 613 const char *fromsnap; 614 const char *tosnap; 615 boolean_t recursive; 616 boolean_t replicate; 617 boolean_t verbose; 618 619 /* 620 * The header nvlist is of the following format: 621 * { 622 * "tosnap" -> string 623 * "fromsnap" -> string (if incremental) 624 * "fss" -> { 625 * id -> { 626 * 627 * "name" -> string (full name; for debugging) 628 * "parentfromsnap" -> number (guid of fromsnap in parent) 629 * 630 * "props" -> { name -> value (only if set here) } 631 * "snaps" -> { name (lastname) -> number (guid) } 632 * "snapprops" -> { name (lastname) -> { name -> value } } 633 * 634 * "origin" -> number (guid) (if clone) 635 * "sent" -> boolean (not on-disk) 636 * } 637 * } 638 * } 639 * 640 */ 641} send_data_t; 642 643static void send_iterate_prop(zfs_handle_t *zhp, nvlist_t *nv); 644 645static int 646send_iterate_snap(zfs_handle_t *zhp, void *arg) 647{ 648 send_data_t *sd = arg; 649 uint64_t guid = zhp->zfs_dmustats.dds_guid; 650 uint64_t txg = zhp->zfs_dmustats.dds_creation_txg; 651 char *snapname; 652 nvlist_t *nv; 653 654 snapname = strrchr(zhp->zfs_name, '@')+1; 655 656 if (sd->tosnap_txg != 0 && txg > sd->tosnap_txg) { 657 if (sd->verbose) { 658 (void) fprintf(stderr, dgettext(TEXT_DOMAIN, 659 "skipping snapshot %s because it was created " 660 "after the destination snapshot (%s)\n"), 661 zhp->zfs_name, sd->tosnap); 662 } 663 zfs_close(zhp); 664 return (0); 665 } 666 667 VERIFY(0 == nvlist_add_uint64(sd->parent_snaps, snapname, guid)); 668 /* 669 * NB: if there is no fromsnap here (it's a newly created fs in 670 * an incremental replication), we will substitute the tosnap. 671 */ 672 if ((sd->fromsnap && strcmp(snapname, sd->fromsnap) == 0) || 673 (sd->parent_fromsnap_guid == 0 && sd->tosnap && 674 strcmp(snapname, sd->tosnap) == 0)) { 675 sd->parent_fromsnap_guid = guid; 676 } 677 678 VERIFY(0 == nvlist_alloc(&nv, NV_UNIQUE_NAME, 0)); 679 send_iterate_prop(zhp, nv); 680 VERIFY(0 == nvlist_add_nvlist(sd->snapprops, snapname, nv)); 681 nvlist_free(nv); 682 683 zfs_close(zhp); 684 return (0); 685} 686 687static void 688send_iterate_prop(zfs_handle_t *zhp, nvlist_t *nv) 689{ 690 nvpair_t *elem = NULL; 691 692 while ((elem = nvlist_next_nvpair(zhp->zfs_props, elem)) != NULL) { 693 char *propname = nvpair_name(elem); 694 zfs_prop_t prop = zfs_name_to_prop(propname); 695 nvlist_t *propnv; 696 697 if (!zfs_prop_user(propname)) { 698 /* 699 * Realistically, this should never happen. However, 700 * we want the ability to add DSL properties without 701 * needing to make incompatible version changes. We 702 * need to ignore unknown properties to allow older 703 * software to still send datasets containing these 704 * properties, with the unknown properties elided. 705 */ 706 if (prop == ZPROP_INVAL) 707 continue; 708 709 if (zfs_prop_readonly(prop)) 710 continue; 711 } 712 713 verify(nvpair_value_nvlist(elem, &propnv) == 0); 714 if (prop == ZFS_PROP_QUOTA || prop == ZFS_PROP_RESERVATION || 715 prop == ZFS_PROP_REFQUOTA || 716 prop == ZFS_PROP_REFRESERVATION) { 717 char *source; 718 uint64_t value; 719 verify(nvlist_lookup_uint64(propnv, 720 ZPROP_VALUE, &value) == 0); 721 if (zhp->zfs_type == ZFS_TYPE_SNAPSHOT) 722 continue; 723 /* 724 * May have no source before SPA_VERSION_RECVD_PROPS, 725 * but is still modifiable. 726 */ 727 if (nvlist_lookup_string(propnv, 728 ZPROP_SOURCE, &source) == 0) { 729 if ((strcmp(source, zhp->zfs_name) != 0) && 730 (strcmp(source, 731 ZPROP_SOURCE_VAL_RECVD) != 0)) 732 continue; 733 } 734 } else { 735 char *source; 736 if (nvlist_lookup_string(propnv, 737 ZPROP_SOURCE, &source) != 0) 738 continue; 739 if ((strcmp(source, zhp->zfs_name) != 0) && 740 (strcmp(source, ZPROP_SOURCE_VAL_RECVD) != 0)) 741 continue; 742 } 743 744 if (zfs_prop_user(propname) || 745 zfs_prop_get_type(prop) == PROP_TYPE_STRING) { 746 char *value; 747 verify(nvlist_lookup_string(propnv, 748 ZPROP_VALUE, &value) == 0); 749 VERIFY(0 == nvlist_add_string(nv, propname, value)); 750 } else { 751 uint64_t value; 752 verify(nvlist_lookup_uint64(propnv, 753 ZPROP_VALUE, &value) == 0); 754 VERIFY(0 == nvlist_add_uint64(nv, propname, value)); 755 } 756 } 757} 758 759/* 760 * returns snapshot creation txg 761 * and returns 0 if the snapshot does not exist 762 */ 763static uint64_t 764get_snap_txg(libzfs_handle_t *hdl, const char *fs, const char *snap) 765{ 766 char name[ZFS_MAX_DATASET_NAME_LEN]; 767 uint64_t txg = 0; 768 769 if (fs == NULL || fs[0] == '\0' || snap == NULL || snap[0] == '\0') 770 return (txg); 771 772 (void) snprintf(name, sizeof (name), "%s@%s", fs, snap); 773 if (zfs_dataset_exists(hdl, name, ZFS_TYPE_SNAPSHOT)) { 774 zfs_handle_t *zhp = zfs_open(hdl, name, ZFS_TYPE_SNAPSHOT); 775 if (zhp != NULL) { 776 txg = zfs_prop_get_int(zhp, ZFS_PROP_CREATETXG); 777 zfs_close(zhp); 778 } 779 } 780 781 return (txg); 782} 783 784/* 785 * recursively generate nvlists describing datasets. See comment 786 * for the data structure send_data_t above for description of contents 787 * of the nvlist. 788 */ 789static int 790send_iterate_fs(zfs_handle_t *zhp, void *arg) 791{ 792 send_data_t *sd = arg; 793 nvlist_t *nvfs, *nv; 794 int rv = 0; 795 uint64_t min_txg = 0, max_txg = 0; 796 uint64_t parent_fromsnap_guid_save = sd->parent_fromsnap_guid; 797 uint64_t fromsnap_txg_save = sd->fromsnap_txg; 798 uint64_t tosnap_txg_save = sd->tosnap_txg; 799 uint64_t txg = zhp->zfs_dmustats.dds_creation_txg; 800 uint64_t guid = zhp->zfs_dmustats.dds_guid; 801 uint64_t fromsnap_txg, tosnap_txg; 802 char guidstring[64]; 803 804 fromsnap_txg = get_snap_txg(zhp->zfs_hdl, zhp->zfs_name, sd->fromsnap); 805 if (fromsnap_txg != 0) 806 sd->fromsnap_txg = fromsnap_txg; 807 808 tosnap_txg = get_snap_txg(zhp->zfs_hdl, zhp->zfs_name, sd->tosnap); 809 if (tosnap_txg != 0) 810 sd->tosnap_txg = tosnap_txg; 811 812 /* 813 * on the send side, if the current dataset does not have tosnap, 814 * perform two additional checks: 815 * 816 * - skip sending the current dataset if it was created later than 817 * the parent tosnap 818 * - return error if the current dataset was created earlier than 819 * the parent tosnap 820 */ 821 if (sd->tosnap != NULL && tosnap_txg == 0) { 822 if (sd->tosnap_txg != 0 && txg > sd->tosnap_txg) { 823 if (sd->verbose) { 824 (void) fprintf(stderr, dgettext(TEXT_DOMAIN, 825 "skipping dataset %s: snapshot %s does " 826 "not exist\n"), zhp->zfs_name, sd->tosnap); 827 } 828 } else { 829 (void) fprintf(stderr, dgettext(TEXT_DOMAIN, 830 "cannot send %s@%s%s: snapshot %s@%s does not " 831 "exist\n"), sd->fsname, sd->tosnap, sd->recursive ? 832 dgettext(TEXT_DOMAIN, " recursively") : "", 833 zhp->zfs_name, sd->tosnap); 834 rv = -1; 835 } 836 goto out; 837 } 838 839 nvfs = fnvlist_alloc(); 840 fnvlist_add_string(nvfs, "name", zhp->zfs_name); 841 fnvlist_add_uint64(nvfs, "parentfromsnap", 842 sd->parent_fromsnap_guid); 843 844 if (zhp->zfs_dmustats.dds_origin[0]) { 845 zfs_handle_t *origin = zfs_open(zhp->zfs_hdl, 846 zhp->zfs_dmustats.dds_origin, ZFS_TYPE_SNAPSHOT); 847 if (origin == NULL) { 848 rv = -1; 849 goto out; 850 } 851 fnvlist_add_uint64(nvfs, "origin", 852 origin->zfs_dmustats.dds_guid); 853 } 854 855 /* iterate over props */ 856 nv = fnvlist_alloc(); 857 send_iterate_prop(zhp, nv); 858 fnvlist_add_nvlist(nvfs, "props", nv); 859 fnvlist_free(nv); 860 861 /* iterate over snaps, and set sd->parent_fromsnap_guid */ 862 sd->parent_fromsnap_guid = 0; 863 sd->parent_snaps = fnvlist_alloc(); 864 sd->snapprops = fnvlist_alloc(); 865 if (!sd->replicate && fromsnap_txg != 0) 866 min_txg = fromsnap_txg; 867 if (!sd->replicate && tosnap_txg != 0) 868 max_txg = tosnap_txg; 869 (void) zfs_iter_snapshots_sorted(zhp, send_iterate_snap, sd, 870 min_txg, max_txg); 871 fnvlist_add_nvlist(nvfs, "snaps", sd->parent_snaps); 872 fnvlist_add_nvlist(nvfs, "snapprops", sd->snapprops); 873 fnvlist_free(sd->parent_snaps); 874 fnvlist_free(sd->snapprops); 875 876 /* add this fs to nvlist */ 877 (void) snprintf(guidstring, sizeof (guidstring), 878 "0x%llx", (longlong_t)guid); 879 fnvlist_add_nvlist(sd->fss, guidstring, nvfs); 880 fnvlist_free(nvfs); 881 882 /* iterate over children */ 883 if (sd->recursive) 884 rv = zfs_iter_filesystems(zhp, send_iterate_fs, sd); 885 886out: 887 sd->parent_fromsnap_guid = parent_fromsnap_guid_save; 888 sd->fromsnap_txg = fromsnap_txg_save; 889 sd->tosnap_txg = tosnap_txg_save; 890 891 zfs_close(zhp); 892 return (rv); 893} 894 895static int 896gather_nvlist(libzfs_handle_t *hdl, const char *fsname, const char *fromsnap, 897 const char *tosnap, boolean_t recursive, boolean_t replicate, 898 boolean_t verbose, nvlist_t **nvlp, avl_tree_t **avlp) 899{ 900 zfs_handle_t *zhp; 901 send_data_t sd = { 0 }; 902 int error; 903 904 zhp = zfs_open(hdl, fsname, ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME); 905 if (zhp == NULL) 906 return (EZFS_BADTYPE); 907 908 VERIFY(0 == nvlist_alloc(&sd.fss, NV_UNIQUE_NAME, 0)); 909 sd.fsname = fsname; 910 sd.fromsnap = fromsnap; 911 sd.tosnap = tosnap; 912 sd.recursive = recursive; 913 sd.replicate = replicate; 914 sd.verbose = verbose; 915 916 if ((error = send_iterate_fs(zhp, &sd)) != 0) { 917 nvlist_free(sd.fss); 918 if (avlp != NULL) 919 *avlp = NULL; 920 *nvlp = NULL; 921 return (error); 922 } 923 924 if (avlp != NULL && (*avlp = fsavl_create(sd.fss)) == NULL) { 925 nvlist_free(sd.fss); 926 *nvlp = NULL; 927 return (EZFS_NOMEM); 928 } 929 930 *nvlp = sd.fss; 931 return (0); 932} 933 934/* 935 * Routines specific to "zfs send" 936 */ 937typedef struct send_dump_data { 938 /* these are all just the short snapname (the part after the @) */ 939 const char *fromsnap; 940 const char *tosnap; 941 char prevsnap[ZFS_MAX_DATASET_NAME_LEN]; 942 uint64_t prevsnap_obj; 943 boolean_t seenfrom, seento, replicate, doall, fromorigin; 944 boolean_t verbose, dryrun, parsable, progress, embed_data, std_out; 945 boolean_t progressastitle; 946 boolean_t large_block, compress; 947 int outfd; 948 boolean_t err; 949 nvlist_t *fss; 950 nvlist_t *snapholds; 951 avl_tree_t *fsavl; 952 snapfilter_cb_t *filter_cb; 953 void *filter_cb_arg; 954 nvlist_t *debugnv; 955 char holdtag[ZFS_MAX_DATASET_NAME_LEN]; 956 int cleanup_fd; 957 uint64_t size; 958} send_dump_data_t; 959 960static int 961zfs_send_space(zfs_handle_t *zhp, const char *snapname, const char *from, 962 enum lzc_send_flags flags, uint64_t *spacep) 963{ 964 libzfs_handle_t *hdl = zhp->zfs_hdl; 965 int error; 966 967 assert(snapname != NULL); 968 error = lzc_send_space(snapname, from, flags, spacep); 969 970 if (error != 0) { 971 char errbuf[1024]; 972 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN, 973 "warning: cannot estimate space for '%s'"), snapname); 974 975 switch (error) { 976 case EXDEV: 977 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 978 "not an earlier snapshot from the same fs")); 979 return (zfs_error(hdl, EZFS_CROSSTARGET, errbuf)); 980 981 case ENOENT: 982 if (zfs_dataset_exists(hdl, snapname, 983 ZFS_TYPE_SNAPSHOT)) { 984 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 985 "incremental source (%s) does not exist"), 986 snapname); 987 } 988 return (zfs_error(hdl, EZFS_NOENT, errbuf)); 989 990 case EDQUOT: 991 case EFBIG: 992 case EIO: 993 case ENOLINK: 994 case ENOSPC: 995 case ENXIO: 996 case EPIPE: 997 case ERANGE: 998 case EFAULT: 999 case EROFS: 1000 case EINVAL: 1001 zfs_error_aux(hdl, strerror(error)); 1002 return (zfs_error(hdl, EZFS_BADBACKUP, errbuf)); 1003 1004 default: 1005 return (zfs_standard_error(hdl, error, errbuf)); 1006 } 1007 } 1008 1009 return (0); 1010} 1011 1012/* 1013 * Dumps a backup of the given snapshot (incremental from fromsnap if it's not 1014 * NULL) to the file descriptor specified by outfd. 1015 */ 1016static int 1017dump_ioctl(zfs_handle_t *zhp, const char *fromsnap, uint64_t fromsnap_obj, 1018 boolean_t fromorigin, int outfd, enum lzc_send_flags flags, 1019 nvlist_t *debugnv) 1020{ 1021 zfs_cmd_t zc = { 0 }; 1022 libzfs_handle_t *hdl = zhp->zfs_hdl; 1023 nvlist_t *thisdbg; 1024 1025 assert(zhp->zfs_type == ZFS_TYPE_SNAPSHOT); 1026 assert(fromsnap_obj == 0 || !fromorigin); 1027 1028 (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name)); 1029 zc.zc_cookie = outfd; 1030 zc.zc_obj = fromorigin; 1031 zc.zc_sendobj = zfs_prop_get_int(zhp, ZFS_PROP_OBJSETID); 1032 zc.zc_fromobj = fromsnap_obj; 1033 zc.zc_flags = flags; 1034 1035 VERIFY(0 == nvlist_alloc(&thisdbg, NV_UNIQUE_NAME, 0)); 1036 if (fromsnap && fromsnap[0] != '\0') { 1037 VERIFY(0 == nvlist_add_string(thisdbg, 1038 "fromsnap", fromsnap)); 1039 } 1040 1041 if (zfs_ioctl(zhp->zfs_hdl, ZFS_IOC_SEND, &zc) != 0) { 1042 char errbuf[1024]; 1043 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN, 1044 "warning: cannot send '%s'"), zhp->zfs_name); 1045 1046 VERIFY(0 == nvlist_add_uint64(thisdbg, "error", errno)); 1047 if (debugnv) { 1048 VERIFY(0 == nvlist_add_nvlist(debugnv, 1049 zhp->zfs_name, thisdbg)); 1050 } 1051 nvlist_free(thisdbg); 1052 1053 switch (errno) { 1054 case EXDEV: 1055 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 1056 "not an earlier snapshot from the same fs")); 1057 return (zfs_error(hdl, EZFS_CROSSTARGET, errbuf)); 1058 1059 case ENOENT: 1060 if (zfs_dataset_exists(hdl, zc.zc_name, 1061 ZFS_TYPE_SNAPSHOT)) { 1062 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 1063 "incremental source (@%s) does not exist"), 1064 zc.zc_value); 1065 } 1066 return (zfs_error(hdl, EZFS_NOENT, errbuf)); 1067 1068 case EDQUOT: 1069 case EFBIG: 1070 case EIO: 1071 case ENOLINK: 1072 case ENOSPC: 1073#ifdef illumos 1074 case ENOSTR: 1075#endif 1076 case ENXIO: 1077 case EPIPE: 1078 case ERANGE: 1079 case EFAULT: 1080 case EROFS: 1081 zfs_error_aux(hdl, strerror(errno)); 1082 return (zfs_error(hdl, EZFS_BADBACKUP, errbuf)); 1083 1084 default: 1085 return (zfs_standard_error(hdl, errno, errbuf)); 1086 } 1087 } 1088 1089 if (debugnv) 1090 VERIFY(0 == nvlist_add_nvlist(debugnv, zhp->zfs_name, thisdbg)); 1091 nvlist_free(thisdbg); 1092 1093 return (0); 1094} 1095 1096static void 1097gather_holds(zfs_handle_t *zhp, send_dump_data_t *sdd) 1098{ 1099 assert(zhp->zfs_type == ZFS_TYPE_SNAPSHOT); 1100 1101 /* 1102 * zfs_send() only sets snapholds for sends that need them, 1103 * e.g. replication and doall. 1104 */ 1105 if (sdd->snapholds == NULL) 1106 return; 1107 1108 fnvlist_add_string(sdd->snapholds, zhp->zfs_name, sdd->holdtag); 1109} 1110 1111static void * 1112send_progress_thread(void *arg) 1113{ 1114 progress_arg_t *pa = arg; 1115 zfs_cmd_t zc = { 0 }; 1116 zfs_handle_t *zhp = pa->pa_zhp; 1117 libzfs_handle_t *hdl = zhp->zfs_hdl; 1118 unsigned long long bytes, total; 1119 char buf[16]; 1120 time_t t; 1121 struct tm *tm; 1122 1123 (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name)); 1124 1125 if (!pa->pa_parsable && !pa->pa_astitle) 1126 (void) fprintf(stderr, "TIME SENT SNAPSHOT\n"); 1127 1128 /* 1129 * Print the progress from ZFS_IOC_SEND_PROGRESS every second. 1130 */ 1131 for (;;) { 1132 (void) sleep(1); 1133 1134 zc.zc_cookie = pa->pa_fd; 1135 if (zfs_ioctl(hdl, ZFS_IOC_SEND_PROGRESS, &zc) != 0) 1136 return ((void *)-1); 1137 1138 (void) time(&t); 1139 tm = localtime(&t); 1140 bytes = zc.zc_cookie; 1141 1142 if (pa->pa_astitle) { 1143 int pct; 1144 if (pa->pa_size > bytes) 1145 pct = 100 * bytes / pa->pa_size; 1146 else 1147 pct = 100; 1148 1149 setproctitle("sending %s (%d%%: %llu/%llu)", 1150 zhp->zfs_name, pct, bytes, pa->pa_size); 1151 } else if (pa->pa_parsable) { 1152 (void) fprintf(stderr, "%02d:%02d:%02d\t%llu\t%s\n", 1153 tm->tm_hour, tm->tm_min, tm->tm_sec, 1154 bytes, zhp->zfs_name); 1155 } else { 1156 zfs_nicenum(bytes, buf, sizeof (buf)); 1157 (void) fprintf(stderr, "%02d:%02d:%02d %5s %s\n", 1158 tm->tm_hour, tm->tm_min, tm->tm_sec, 1159 buf, zhp->zfs_name); 1160 } 1161 } 1162} 1163 1164static void 1165send_print_verbose(FILE *fout, const char *tosnap, const char *fromsnap, 1166 uint64_t size, boolean_t parsable) 1167{ 1168 if (parsable) { 1169 if (fromsnap != NULL) { 1170 (void) fprintf(fout, "incremental\t%s\t%s", 1171 fromsnap, tosnap); 1172 } else { 1173 (void) fprintf(fout, "full\t%s", 1174 tosnap); 1175 } 1176 } else { 1177 if (fromsnap != NULL) { 1178 if (strchr(fromsnap, '@') == NULL && 1179 strchr(fromsnap, '#') == NULL) { 1180 (void) fprintf(fout, dgettext(TEXT_DOMAIN, 1181 "send from @%s to %s"), 1182 fromsnap, tosnap); 1183 } else { 1184 (void) fprintf(fout, dgettext(TEXT_DOMAIN, 1185 "send from %s to %s"), 1186 fromsnap, tosnap); 1187 } 1188 } else { 1189 (void) fprintf(fout, dgettext(TEXT_DOMAIN, 1190 "full send of %s"), 1191 tosnap); 1192 } 1193 } 1194 1195 if (parsable) { 1196 (void) fprintf(fout, "\t%llu", 1197 (longlong_t)size); 1198 } else if (size != 0) { 1199 char buf[16]; 1200 zfs_nicenum(size, buf, sizeof (buf)); 1201 (void) fprintf(fout, dgettext(TEXT_DOMAIN, 1202 " estimated size is %s"), buf); 1203 } 1204 (void) fprintf(fout, "\n"); 1205} 1206 1207static int 1208dump_snapshot(zfs_handle_t *zhp, void *arg) 1209{ 1210 send_dump_data_t *sdd = arg; 1211 progress_arg_t pa = { 0 }; 1212 pthread_t tid; 1213 char *thissnap; 1214 enum lzc_send_flags flags = 0; 1215 int err; 1216 boolean_t isfromsnap, istosnap, fromorigin; 1217 boolean_t exclude = B_FALSE; 1218 FILE *fout = sdd->std_out ? stdout : stderr; 1219 1220 err = 0; 1221 thissnap = strchr(zhp->zfs_name, '@') + 1; 1222 isfromsnap = (sdd->fromsnap != NULL && 1223 strcmp(sdd->fromsnap, thissnap) == 0); 1224 1225 if (!sdd->seenfrom && isfromsnap) { 1226 gather_holds(zhp, sdd); 1227 sdd->seenfrom = B_TRUE; 1228 (void) strcpy(sdd->prevsnap, thissnap); 1229 sdd->prevsnap_obj = zfs_prop_get_int(zhp, ZFS_PROP_OBJSETID); 1230 zfs_close(zhp); 1231 return (0); 1232 } 1233 1234 if (sdd->seento || !sdd->seenfrom) { 1235 zfs_close(zhp); 1236 return (0); 1237 } 1238 1239 istosnap = (strcmp(sdd->tosnap, thissnap) == 0); 1240 if (istosnap) 1241 sdd->seento = B_TRUE; 1242 1243 if (sdd->large_block) 1244 flags |= LZC_SEND_FLAG_LARGE_BLOCK; 1245 if (sdd->embed_data) 1246 flags |= LZC_SEND_FLAG_EMBED_DATA; 1247 if (sdd->compress) 1248 flags |= LZC_SEND_FLAG_COMPRESS; 1249 1250 if (!sdd->doall && !isfromsnap && !istosnap) { 1251 if (sdd->replicate) { 1252 char *snapname; 1253 nvlist_t *snapprops; 1254 /* 1255 * Filter out all intermediate snapshots except origin 1256 * snapshots needed to replicate clones. 1257 */ 1258 nvlist_t *nvfs = fsavl_find(sdd->fsavl, 1259 zhp->zfs_dmustats.dds_guid, &snapname); 1260 1261 VERIFY(0 == nvlist_lookup_nvlist(nvfs, 1262 "snapprops", &snapprops)); 1263 VERIFY(0 == nvlist_lookup_nvlist(snapprops, 1264 thissnap, &snapprops)); 1265 exclude = !nvlist_exists(snapprops, "is_clone_origin"); 1266 } else { 1267 exclude = B_TRUE; 1268 } 1269 } 1270 1271 /* 1272 * If a filter function exists, call it to determine whether 1273 * this snapshot will be sent. 1274 */ 1275 if (exclude || (sdd->filter_cb != NULL && 1276 sdd->filter_cb(zhp, sdd->filter_cb_arg) == B_FALSE)) { 1277 /* 1278 * This snapshot is filtered out. Don't send it, and don't 1279 * set prevsnap_obj, so it will be as if this snapshot didn't 1280 * exist, and the next accepted snapshot will be sent as 1281 * an incremental from the last accepted one, or as the 1282 * first (and full) snapshot in the case of a replication, 1283 * non-incremental send. 1284 */ 1285 zfs_close(zhp); 1286 return (0); 1287 } 1288 1289 gather_holds(zhp, sdd); 1290 fromorigin = sdd->prevsnap[0] == '\0' && 1291 (sdd->fromorigin || sdd->replicate); 1292 1293 if (sdd->verbose || sdd->progress) { 1294 uint64_t size = 0; 1295 char fromds[ZFS_MAX_DATASET_NAME_LEN]; 1296 1297 if (sdd->prevsnap[0] != '\0') { 1298 (void) strlcpy(fromds, zhp->zfs_name, sizeof (fromds)); 1299 *(strchr(fromds, '@') + 1) = '\0'; 1300 (void) strlcat(fromds, sdd->prevsnap, sizeof (fromds)); 1301 } 1302 if (zfs_send_space(zhp, zhp->zfs_name, 1303 sdd->prevsnap[0] ? fromds : NULL, flags, &size) != 0) { 1304 size = 0; /* cannot estimate send space */ 1305 } else { 1306 send_print_verbose(fout, zhp->zfs_name, 1307 sdd->prevsnap[0] ? sdd->prevsnap : NULL, 1308 size, sdd->parsable); 1309 } 1310 sdd->size += size; 1311 } 1312 1313 if (!sdd->dryrun) { 1314 /* 1315 * If progress reporting is requested, spawn a new thread to 1316 * poll ZFS_IOC_SEND_PROGRESS at a regular interval. 1317 */ 1318 if (sdd->progress) { 1319 pa.pa_zhp = zhp; 1320 pa.pa_fd = sdd->outfd; 1321 pa.pa_parsable = sdd->parsable; 1322 pa.pa_size = sdd->size; 1323 pa.pa_astitle = sdd->progressastitle; 1324 1325 if ((err = pthread_create(&tid, NULL, 1326 send_progress_thread, &pa)) != 0) { 1327 zfs_close(zhp); 1328 return (err); 1329 } 1330 } 1331 1332 err = dump_ioctl(zhp, sdd->prevsnap, sdd->prevsnap_obj, 1333 fromorigin, sdd->outfd, flags, sdd->debugnv); 1334 1335 if (sdd->progress) { 1336 (void) pthread_cancel(tid); 1337 (void) pthread_join(tid, NULL); 1338 } 1339 } 1340 1341 (void) strcpy(sdd->prevsnap, thissnap); 1342 sdd->prevsnap_obj = zfs_prop_get_int(zhp, ZFS_PROP_OBJSETID); 1343 zfs_close(zhp); 1344 return (err); 1345} 1346 1347static int 1348dump_filesystem(zfs_handle_t *zhp, void *arg) 1349{ 1350 int rv = 0; 1351 send_dump_data_t *sdd = arg; 1352 boolean_t missingfrom = B_FALSE; 1353 zfs_cmd_t zc = { 0 }; 1354 uint64_t min_txg = 0, max_txg = 0; 1355 1356 (void) snprintf(zc.zc_name, sizeof (zc.zc_name), "%s@%s", 1357 zhp->zfs_name, sdd->tosnap); 1358 if (ioctl(zhp->zfs_hdl->libzfs_fd, ZFS_IOC_OBJSET_STATS, &zc) != 0) { 1359 (void) fprintf(stderr, dgettext(TEXT_DOMAIN, 1360 "WARNING: could not send %s@%s: does not exist\n"), 1361 zhp->zfs_name, sdd->tosnap); 1362 sdd->err = B_TRUE; 1363 return (0); 1364 } 1365 1366 if (sdd->replicate && sdd->fromsnap) { 1367 /* 1368 * If this fs does not have fromsnap, and we're doing 1369 * recursive, we need to send a full stream from the 1370 * beginning (or an incremental from the origin if this 1371 * is a clone). If we're doing non-recursive, then let 1372 * them get the error. 1373 */ 1374 (void) snprintf(zc.zc_name, sizeof (zc.zc_name), "%s@%s", 1375 zhp->zfs_name, sdd->fromsnap); 1376 if (ioctl(zhp->zfs_hdl->libzfs_fd, 1377 ZFS_IOC_OBJSET_STATS, &zc) != 0) { 1378 missingfrom = B_TRUE; 1379 } 1380 } 1381 1382 sdd->seenfrom = sdd->seento = sdd->prevsnap[0] = 0; 1383 sdd->prevsnap_obj = 0; 1384 if (sdd->fromsnap == NULL || missingfrom) 1385 sdd->seenfrom = B_TRUE; 1386 1387 if (!sdd->replicate && sdd->fromsnap != NULL) 1388 min_txg = get_snap_txg(zhp->zfs_hdl, zhp->zfs_name, 1389 sdd->fromsnap); 1390 if (!sdd->replicate && sdd->tosnap != NULL) 1391 max_txg = get_snap_txg(zhp->zfs_hdl, zhp->zfs_name, 1392 sdd->tosnap); 1393 1394 rv = zfs_iter_snapshots_sorted(zhp, dump_snapshot, arg, 1395 min_txg, max_txg); 1396 if (!sdd->seenfrom) { 1397 (void) fprintf(stderr, dgettext(TEXT_DOMAIN, 1398 "WARNING: could not send %s@%s:\n" 1399 "incremental source (%s@%s) does not exist\n"), 1400 zhp->zfs_name, sdd->tosnap, 1401 zhp->zfs_name, sdd->fromsnap); 1402 sdd->err = B_TRUE; 1403 } else if (!sdd->seento) { 1404 if (sdd->fromsnap) { 1405 (void) fprintf(stderr, dgettext(TEXT_DOMAIN, 1406 "WARNING: could not send %s@%s:\n" 1407 "incremental source (%s@%s) " 1408 "is not earlier than it\n"), 1409 zhp->zfs_name, sdd->tosnap, 1410 zhp->zfs_name, sdd->fromsnap); 1411 } else { 1412 (void) fprintf(stderr, dgettext(TEXT_DOMAIN, 1413 "WARNING: " 1414 "could not send %s@%s: does not exist\n"), 1415 zhp->zfs_name, sdd->tosnap); 1416 } 1417 sdd->err = B_TRUE; 1418 } 1419 1420 return (rv); 1421} 1422 1423static int 1424dump_filesystems(zfs_handle_t *rzhp, void *arg) 1425{ 1426 send_dump_data_t *sdd = arg; 1427 nvpair_t *fspair; 1428 boolean_t needagain, progress; 1429 1430 if (!sdd->replicate) 1431 return (dump_filesystem(rzhp, sdd)); 1432 1433 /* Mark the clone origin snapshots. */ 1434 for (fspair = nvlist_next_nvpair(sdd->fss, NULL); fspair; 1435 fspair = nvlist_next_nvpair(sdd->fss, fspair)) { 1436 nvlist_t *nvfs; 1437 uint64_t origin_guid = 0; 1438 1439 VERIFY(0 == nvpair_value_nvlist(fspair, &nvfs)); 1440 (void) nvlist_lookup_uint64(nvfs, "origin", &origin_guid); 1441 if (origin_guid != 0) { 1442 char *snapname; 1443 nvlist_t *origin_nv = fsavl_find(sdd->fsavl, 1444 origin_guid, &snapname); 1445 if (origin_nv != NULL) { 1446 nvlist_t *snapprops; 1447 VERIFY(0 == nvlist_lookup_nvlist(origin_nv, 1448 "snapprops", &snapprops)); 1449 VERIFY(0 == nvlist_lookup_nvlist(snapprops, 1450 snapname, &snapprops)); 1451 VERIFY(0 == nvlist_add_boolean( 1452 snapprops, "is_clone_origin")); 1453 } 1454 } 1455 } 1456again: 1457 needagain = progress = B_FALSE; 1458 for (fspair = nvlist_next_nvpair(sdd->fss, NULL); fspair; 1459 fspair = nvlist_next_nvpair(sdd->fss, fspair)) { 1460 nvlist_t *fslist, *parent_nv; 1461 char *fsname; 1462 zfs_handle_t *zhp; 1463 int err; 1464 uint64_t origin_guid = 0; 1465 uint64_t parent_guid = 0; 1466 1467 VERIFY(nvpair_value_nvlist(fspair, &fslist) == 0); 1468 if (nvlist_lookup_boolean(fslist, "sent") == 0) 1469 continue; 1470 1471 VERIFY(nvlist_lookup_string(fslist, "name", &fsname) == 0); 1472 (void) nvlist_lookup_uint64(fslist, "origin", &origin_guid); 1473 (void) nvlist_lookup_uint64(fslist, "parentfromsnap", 1474 &parent_guid); 1475 1476 if (parent_guid != 0) { 1477 parent_nv = fsavl_find(sdd->fsavl, parent_guid, NULL); 1478 if (!nvlist_exists(parent_nv, "sent")) { 1479 /* parent has not been sent; skip this one */ 1480 needagain = B_TRUE; 1481 continue; 1482 } 1483 } 1484 1485 if (origin_guid != 0) { 1486 nvlist_t *origin_nv = fsavl_find(sdd->fsavl, 1487 origin_guid, NULL); 1488 if (origin_nv != NULL && 1489 !nvlist_exists(origin_nv, "sent")) { 1490 /* 1491 * origin has not been sent yet; 1492 * skip this clone. 1493 */ 1494 needagain = B_TRUE; 1495 continue; 1496 } 1497 } 1498 1499 zhp = zfs_open(rzhp->zfs_hdl, fsname, ZFS_TYPE_DATASET); 1500 if (zhp == NULL) 1501 return (-1); 1502 err = dump_filesystem(zhp, sdd); 1503 VERIFY(nvlist_add_boolean(fslist, "sent") == 0); 1504 progress = B_TRUE; 1505 zfs_close(zhp); 1506 if (err) 1507 return (err); 1508 } 1509 if (needagain) { 1510 assert(progress); 1511 goto again; 1512 } 1513 1514 /* clean out the sent flags in case we reuse this fss */ 1515 for (fspair = nvlist_next_nvpair(sdd->fss, NULL); fspair; 1516 fspair = nvlist_next_nvpair(sdd->fss, fspair)) { 1517 nvlist_t *fslist; 1518 1519 VERIFY(nvpair_value_nvlist(fspair, &fslist) == 0); 1520 (void) nvlist_remove_all(fslist, "sent"); 1521 } 1522 1523 return (0); 1524} 1525 1526nvlist_t * 1527zfs_send_resume_token_to_nvlist(libzfs_handle_t *hdl, const char *token) 1528{ 1529 unsigned int version; 1530 int nread; 1531 unsigned long long checksum, packed_len; 1532 1533 /* 1534 * Decode token header, which is: 1535 * <token version>-<checksum of payload>-<uncompressed payload length> 1536 * Note that the only supported token version is 1. 1537 */ 1538 nread = sscanf(token, "%u-%llx-%llx-", 1539 &version, &checksum, &packed_len); 1540 if (nread != 3) { 1541 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 1542 "resume token is corrupt (invalid format)")); 1543 return (NULL); 1544 } 1545 1546 if (version != ZFS_SEND_RESUME_TOKEN_VERSION) { 1547 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 1548 "resume token is corrupt (invalid version %u)"), 1549 version); 1550 return (NULL); 1551 } 1552 1553 /* convert hexadecimal representation to binary */ 1554 token = strrchr(token, '-') + 1; 1555 int len = strlen(token) / 2; 1556 unsigned char *compressed = zfs_alloc(hdl, len); 1557 for (int i = 0; i < len; i++) { 1558 nread = sscanf(token + i * 2, "%2hhx", compressed + i); 1559 if (nread != 1) { 1560 free(compressed); 1561 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 1562 "resume token is corrupt " 1563 "(payload is not hex-encoded)")); 1564 return (NULL); 1565 } 1566 } 1567 1568 /* verify checksum */ 1569 zio_cksum_t cksum; 1570 fletcher_4_native(compressed, len, NULL, &cksum); 1571 if (cksum.zc_word[0] != checksum) { 1572 free(compressed); 1573 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 1574 "resume token is corrupt (incorrect checksum)")); 1575 return (NULL); 1576 } 1577 1578 /* uncompress */ 1579 void *packed = zfs_alloc(hdl, packed_len); 1580 uLongf packed_len_long = packed_len; 1581 if (uncompress(packed, &packed_len_long, compressed, len) != Z_OK || 1582 packed_len_long != packed_len) { 1583 free(packed); 1584 free(compressed); 1585 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 1586 "resume token is corrupt (decompression failed)")); 1587 return (NULL); 1588 } 1589 1590 /* unpack nvlist */ 1591 nvlist_t *nv; 1592 int error = nvlist_unpack(packed, packed_len, &nv, KM_SLEEP); 1593 free(packed); 1594 free(compressed); 1595 if (error != 0) { 1596 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 1597 "resume token is corrupt (nvlist_unpack failed)")); 1598 return (NULL); 1599 } 1600 return (nv); 1601} 1602 1603int 1604zfs_send_resume(libzfs_handle_t *hdl, sendflags_t *flags, int outfd, 1605 const char *resume_token) 1606{ 1607 char errbuf[1024]; 1608 char *toname; 1609 char *fromname = NULL; 1610 uint64_t resumeobj, resumeoff, toguid, fromguid, bytes; 1611 zfs_handle_t *zhp; 1612 int error = 0; 1613 char name[ZFS_MAX_DATASET_NAME_LEN]; 1614 enum lzc_send_flags lzc_flags = 0; 1615 uint64_t size = 0; 1616 FILE *fout = (flags->verbose && flags->dryrun) ? stdout : stderr; 1617 1618 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN, 1619 "cannot resume send")); 1620 1621 nvlist_t *resume_nvl = 1622 zfs_send_resume_token_to_nvlist(hdl, resume_token); 1623 if (resume_nvl == NULL) { 1624 /* 1625 * zfs_error_aux has already been set by 1626 * zfs_send_resume_token_to_nvlist 1627 */ 1628 return (zfs_error(hdl, EZFS_FAULT, errbuf)); 1629 } 1630 if (flags->verbose) { 1631 (void) fprintf(fout, dgettext(TEXT_DOMAIN, 1632 "resume token contents:\n")); 1633 nvlist_print(fout, resume_nvl); 1634 } 1635 1636 if (nvlist_lookup_string(resume_nvl, "toname", &toname) != 0 || 1637 nvlist_lookup_uint64(resume_nvl, "object", &resumeobj) != 0 || 1638 nvlist_lookup_uint64(resume_nvl, "offset", &resumeoff) != 0 || 1639 nvlist_lookup_uint64(resume_nvl, "bytes", &bytes) != 0 || 1640 nvlist_lookup_uint64(resume_nvl, "toguid", &toguid) != 0) { 1641 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 1642 "resume token is corrupt")); 1643 return (zfs_error(hdl, EZFS_FAULT, errbuf)); 1644 } 1645 fromguid = 0; 1646 (void) nvlist_lookup_uint64(resume_nvl, "fromguid", &fromguid); 1647 1648 if (flags->largeblock || nvlist_exists(resume_nvl, "largeblockok")) 1649 lzc_flags |= LZC_SEND_FLAG_LARGE_BLOCK; 1650 if (flags->embed_data || nvlist_exists(resume_nvl, "embedok")) 1651 lzc_flags |= LZC_SEND_FLAG_EMBED_DATA; 1652 if (flags->compress || nvlist_exists(resume_nvl, "compressok")) 1653 lzc_flags |= LZC_SEND_FLAG_COMPRESS; 1654 1655 if (guid_to_name(hdl, toname, toguid, B_FALSE, name) != 0) { 1656 if (zfs_dataset_exists(hdl, toname, ZFS_TYPE_DATASET)) { 1657 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 1658 "'%s' is no longer the same snapshot used in " 1659 "the initial send"), toname); 1660 } else { 1661 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 1662 "'%s' used in the initial send no longer exists"), 1663 toname); 1664 } 1665 return (zfs_error(hdl, EZFS_BADPATH, errbuf)); 1666 } 1667 zhp = zfs_open(hdl, name, ZFS_TYPE_DATASET); 1668 if (zhp == NULL) { 1669 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 1670 "unable to access '%s'"), name); 1671 return (zfs_error(hdl, EZFS_BADPATH, errbuf)); 1672 } 1673 1674 if (fromguid != 0) { 1675 if (guid_to_name(hdl, toname, fromguid, B_TRUE, name) != 0) { 1676 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 1677 "incremental source %#llx no longer exists"), 1678 (longlong_t)fromguid); 1679 return (zfs_error(hdl, EZFS_BADPATH, errbuf)); 1680 } 1681 fromname = name; 1682 } 1683 1684 if (flags->progress || flags->verbose) { 1685 error = lzc_send_space(zhp->zfs_name, fromname, 1686 lzc_flags, &size); 1687 if (error == 0) 1688 size = MAX(0, (int64_t)(size - bytes)); 1689 } 1690 if (flags->verbose) { 1691 send_print_verbose(fout, zhp->zfs_name, fromname, 1692 size, flags->parsable); 1693 } 1694 1695 if (!flags->dryrun) { 1696 progress_arg_t pa = { 0 }; 1697 pthread_t tid; 1698 /* 1699 * If progress reporting is requested, spawn a new thread to 1700 * poll ZFS_IOC_SEND_PROGRESS at a regular interval. 1701 */ 1702 if (flags->progress) { 1703 pa.pa_zhp = zhp; 1704 pa.pa_fd = outfd; 1705 pa.pa_parsable = flags->parsable; 1706 pa.pa_size = size; 1707 pa.pa_astitle = flags->progressastitle; 1708 1709 error = pthread_create(&tid, NULL, 1710 send_progress_thread, &pa); 1711 if (error != 0) { 1712 zfs_close(zhp); 1713 return (error); 1714 } 1715 } 1716 1717 error = lzc_send_resume(zhp->zfs_name, fromname, outfd, 1718 lzc_flags, resumeobj, resumeoff); 1719 1720 if (flags->progress) { 1721 (void) pthread_cancel(tid); 1722 (void) pthread_join(tid, NULL); 1723 } 1724 1725 char errbuf[1024]; 1726 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN, 1727 "warning: cannot send '%s'"), zhp->zfs_name); 1728 1729 zfs_close(zhp); 1730 1731 switch (error) { 1732 case 0: 1733 return (0); 1734 case EXDEV: 1735 case ENOENT: 1736 case EDQUOT: 1737 case EFBIG: 1738 case EIO: 1739 case ENOLINK: 1740 case ENOSPC: 1741#ifdef illumos 1742 case ENOSTR: 1743#endif 1744 case ENXIO: 1745 case EPIPE: 1746 case ERANGE: 1747 case EFAULT: 1748 case EROFS: 1749 zfs_error_aux(hdl, strerror(errno)); 1750 return (zfs_error(hdl, EZFS_BADBACKUP, errbuf)); 1751 1752 default: 1753 return (zfs_standard_error(hdl, errno, errbuf)); 1754 } 1755 } 1756 1757 1758 zfs_close(zhp); 1759 1760 return (error); 1761} 1762 1763/* 1764 * Generate a send stream for the dataset identified by the argument zhp. 1765 * 1766 * The content of the send stream is the snapshot identified by 1767 * 'tosnap'. Incremental streams are requested in two ways: 1768 * - from the snapshot identified by "fromsnap" (if non-null) or 1769 * - from the origin of the dataset identified by zhp, which must 1770 * be a clone. In this case, "fromsnap" is null and "fromorigin" 1771 * is TRUE. 1772 * 1773 * The send stream is recursive (i.e. dumps a hierarchy of snapshots) and 1774 * uses a special header (with a hdrtype field of DMU_COMPOUNDSTREAM) 1775 * if "replicate" is set. If "doall" is set, dump all the intermediate 1776 * snapshots. The DMU_COMPOUNDSTREAM header is used in the "doall" 1777 * case too. If "props" is set, send properties. 1778 */ 1779int 1780zfs_send(zfs_handle_t *zhp, const char *fromsnap, const char *tosnap, 1781 sendflags_t *flags, int outfd, snapfilter_cb_t filter_func, 1782 void *cb_arg, nvlist_t **debugnvp) 1783{ 1784 char errbuf[1024]; 1785 send_dump_data_t sdd = { 0 }; 1786 int err = 0; 1787 nvlist_t *fss = NULL; 1788 avl_tree_t *fsavl = NULL; 1789 static uint64_t holdseq; 1790 int spa_version; 1791 pthread_t tid = 0; 1792 int pipefd[2]; 1793 dedup_arg_t dda = { 0 }; 1794 int featureflags = 0; 1795 FILE *fout; 1796 1797 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN, 1798 "cannot send '%s'"), zhp->zfs_name); 1799 1800 if (fromsnap && fromsnap[0] == '\0') { 1801 zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN, 1802 "zero-length incremental source")); 1803 return (zfs_error(zhp->zfs_hdl, EZFS_NOENT, errbuf)); 1804 } 1805 1806 if (zhp->zfs_type == ZFS_TYPE_FILESYSTEM) { 1807 uint64_t version; 1808 version = zfs_prop_get_int(zhp, ZFS_PROP_VERSION); 1809 if (version >= ZPL_VERSION_SA) { 1810 featureflags |= DMU_BACKUP_FEATURE_SA_SPILL; 1811 } 1812 } 1813 1814 if (flags->dedup && !flags->dryrun) { 1815 featureflags |= (DMU_BACKUP_FEATURE_DEDUP | 1816 DMU_BACKUP_FEATURE_DEDUPPROPS); 1817 if ((err = pipe(pipefd)) != 0) { 1818 zfs_error_aux(zhp->zfs_hdl, strerror(errno)); 1819 return (zfs_error(zhp->zfs_hdl, EZFS_PIPEFAILED, 1820 errbuf)); 1821 } 1822 dda.outputfd = outfd; 1823 dda.inputfd = pipefd[1]; 1824 dda.dedup_hdl = zhp->zfs_hdl; 1825 if ((err = pthread_create(&tid, NULL, cksummer, &dda)) != 0) { 1826 (void) close(pipefd[0]); 1827 (void) close(pipefd[1]); 1828 zfs_error_aux(zhp->zfs_hdl, strerror(errno)); 1829 return (zfs_error(zhp->zfs_hdl, 1830 EZFS_THREADCREATEFAILED, errbuf)); 1831 } 1832 } 1833 1834 if (flags->replicate || flags->doall || flags->props) { 1835 dmu_replay_record_t drr = { 0 }; 1836 char *packbuf = NULL; 1837 size_t buflen = 0; 1838 zio_cksum_t zc = { 0 }; 1839 1840 if (flags->replicate || flags->props) { 1841 nvlist_t *hdrnv; 1842 1843 VERIFY(0 == nvlist_alloc(&hdrnv, NV_UNIQUE_NAME, 0)); 1844 if (fromsnap) { 1845 VERIFY(0 == nvlist_add_string(hdrnv, 1846 "fromsnap", fromsnap)); 1847 } 1848 VERIFY(0 == nvlist_add_string(hdrnv, "tosnap", tosnap)); 1849 if (!flags->replicate) { 1850 VERIFY(0 == nvlist_add_boolean(hdrnv, 1851 "not_recursive")); 1852 } 1853 1854 err = gather_nvlist(zhp->zfs_hdl, zhp->zfs_name, 1855 fromsnap, tosnap, flags->replicate, 1856 flags->replicate, flags->verbose, &fss, &fsavl); 1857 if (err) 1858 goto err_out; 1859 VERIFY(0 == nvlist_add_nvlist(hdrnv, "fss", fss)); 1860 err = nvlist_pack(hdrnv, &packbuf, &buflen, 1861 NV_ENCODE_XDR, 0); 1862 if (debugnvp) 1863 *debugnvp = hdrnv; 1864 else 1865 nvlist_free(hdrnv); 1866 if (err) 1867 goto stderr_out; 1868 } 1869 1870 if (!flags->dryrun) { 1871 /* write first begin record */ 1872 drr.drr_type = DRR_BEGIN; 1873 drr.drr_u.drr_begin.drr_magic = DMU_BACKUP_MAGIC; 1874 DMU_SET_STREAM_HDRTYPE(drr.drr_u.drr_begin. 1875 drr_versioninfo, DMU_COMPOUNDSTREAM); 1876 DMU_SET_FEATUREFLAGS(drr.drr_u.drr_begin. 1877 drr_versioninfo, featureflags); 1878 (void) snprintf(drr.drr_u.drr_begin.drr_toname, 1879 sizeof (drr.drr_u.drr_begin.drr_toname), 1880 "%s@%s", zhp->zfs_name, tosnap); 1881 drr.drr_payloadlen = buflen; 1882 1883 err = dump_record(&drr, packbuf, buflen, &zc, outfd); 1884 free(packbuf); 1885 if (err != 0) 1886 goto stderr_out; 1887 1888 /* write end record */ 1889 bzero(&drr, sizeof (drr)); 1890 drr.drr_type = DRR_END; 1891 drr.drr_u.drr_end.drr_checksum = zc; 1892 err = write(outfd, &drr, sizeof (drr)); 1893 if (err == -1) { 1894 err = errno; 1895 goto stderr_out; 1896 } 1897 1898 err = 0; 1899 } 1900 } 1901 1902 /* dump each stream */ 1903 sdd.fromsnap = fromsnap; 1904 sdd.tosnap = tosnap; 1905 if (tid != 0) 1906 sdd.outfd = pipefd[0]; 1907 else 1908 sdd.outfd = outfd; 1909 sdd.replicate = flags->replicate; 1910 sdd.doall = flags->doall; 1911 sdd.fromorigin = flags->fromorigin; 1912 sdd.fss = fss; 1913 sdd.fsavl = fsavl; 1914 sdd.verbose = flags->verbose; 1915 sdd.parsable = flags->parsable; 1916 sdd.progress = flags->progress; 1917 sdd.progressastitle = flags->progressastitle; 1918 sdd.dryrun = flags->dryrun; 1919 sdd.large_block = flags->largeblock; 1920 sdd.embed_data = flags->embed_data; 1921 sdd.compress = flags->compress; 1922 sdd.filter_cb = filter_func; 1923 sdd.filter_cb_arg = cb_arg; 1924 if (debugnvp) 1925 sdd.debugnv = *debugnvp; 1926 if (sdd.verbose && sdd.dryrun) 1927 sdd.std_out = B_TRUE; 1928 fout = sdd.std_out ? stdout : stderr; 1929 1930 /* 1931 * Some flags require that we place user holds on the datasets that are 1932 * being sent so they don't get destroyed during the send. We can skip 1933 * this step if the pool is imported read-only since the datasets cannot 1934 * be destroyed. 1935 */ 1936 if (!flags->dryrun && !zpool_get_prop_int(zfs_get_pool_handle(zhp), 1937 ZPOOL_PROP_READONLY, NULL) && 1938 zfs_spa_version(zhp, &spa_version) == 0 && 1939 spa_version >= SPA_VERSION_USERREFS && 1940 (flags->doall || flags->replicate)) { 1941 ++holdseq; 1942 (void) snprintf(sdd.holdtag, sizeof (sdd.holdtag), 1943 ".send-%d-%llu", getpid(), (u_longlong_t)holdseq); 1944 sdd.cleanup_fd = open(ZFS_DEV, O_RDWR|O_EXCL); 1945 if (sdd.cleanup_fd < 0) { 1946 err = errno; 1947 goto stderr_out; 1948 } 1949 sdd.snapholds = fnvlist_alloc(); 1950 } else { 1951 sdd.cleanup_fd = -1; 1952 sdd.snapholds = NULL; 1953 } 1954 if (flags->progress || flags->verbose || sdd.snapholds != NULL) { 1955 /* 1956 * Do a verbose no-op dry run to get all the verbose output 1957 * or to gather snapshot hold's before generating any data, 1958 * then do a non-verbose real run to generate the streams. 1959 */ 1960 sdd.dryrun = B_TRUE; 1961 err = dump_filesystems(zhp, &sdd); 1962 1963 if (err != 0) 1964 goto stderr_out; 1965 1966 if (flags->verbose) { 1967 if (flags->parsable) { 1968 (void) fprintf(fout, "size\t%llu\n", 1969 (longlong_t)sdd.size); 1970 } else { 1971 char buf[16]; 1972 zfs_nicenum(sdd.size, buf, sizeof (buf)); 1973 (void) fprintf(fout, dgettext(TEXT_DOMAIN, 1974 "total estimated size is %s\n"), buf); 1975 } 1976 } 1977 1978 /* Ensure no snaps found is treated as an error. */ 1979 if (!sdd.seento) { 1980 err = ENOENT; 1981 goto err_out; 1982 } 1983 1984 /* Skip the second run if dryrun was requested. */ 1985 if (flags->dryrun) 1986 goto err_out; 1987 1988 if (sdd.snapholds != NULL) { 1989 err = zfs_hold_nvl(zhp, sdd.cleanup_fd, sdd.snapholds); 1990 if (err != 0) 1991 goto stderr_out; 1992 1993 fnvlist_free(sdd.snapholds); 1994 sdd.snapholds = NULL; 1995 } 1996 1997 sdd.dryrun = B_FALSE; 1998 sdd.verbose = B_FALSE; 1999 } 2000 2001 err = dump_filesystems(zhp, &sdd); 2002 fsavl_destroy(fsavl); 2003 nvlist_free(fss); 2004 2005 /* Ensure no snaps found is treated as an error. */ 2006 if (err == 0 && !sdd.seento) 2007 err = ENOENT; 2008 2009 if (tid != 0) { 2010 if (err != 0) 2011 (void) pthread_cancel(tid); 2012 (void) close(pipefd[0]); 2013 (void) pthread_join(tid, NULL); 2014 } 2015 2016 if (sdd.cleanup_fd != -1) { 2017 VERIFY(0 == close(sdd.cleanup_fd)); 2018 sdd.cleanup_fd = -1; 2019 } 2020 2021 if (!flags->dryrun && (flags->replicate || flags->doall || 2022 flags->props)) { 2023 /* 2024 * write final end record. NB: want to do this even if 2025 * there was some error, because it might not be totally 2026 * failed. 2027 */ 2028 dmu_replay_record_t drr = { 0 }; 2029 drr.drr_type = DRR_END; 2030 if (write(outfd, &drr, sizeof (drr)) == -1) { 2031 return (zfs_standard_error(zhp->zfs_hdl, 2032 errno, errbuf)); 2033 } 2034 } 2035 2036 return (err || sdd.err); 2037 2038stderr_out: 2039 err = zfs_standard_error(zhp->zfs_hdl, err, errbuf); 2040err_out: 2041 fsavl_destroy(fsavl); 2042 nvlist_free(fss); 2043 fnvlist_free(sdd.snapholds); 2044 2045 if (sdd.cleanup_fd != -1) 2046 VERIFY(0 == close(sdd.cleanup_fd)); 2047 if (tid != 0) { 2048 (void) pthread_cancel(tid); 2049 (void) close(pipefd[0]); 2050 (void) pthread_join(tid, NULL); 2051 } 2052 return (err); 2053} 2054 2055int 2056zfs_send_one(zfs_handle_t *zhp, const char *from, int fd, sendflags_t flags) 2057{ 2058 int err = 0; 2059 libzfs_handle_t *hdl = zhp->zfs_hdl; 2060 enum lzc_send_flags lzc_flags = 0; 2061 FILE *fout = (flags.verbose && flags.dryrun) ? stdout : stderr; 2062 char errbuf[1024]; 2063 2064 if (flags.largeblock) 2065 lzc_flags |= LZC_SEND_FLAG_LARGE_BLOCK; 2066 if (flags.embed_data) 2067 lzc_flags |= LZC_SEND_FLAG_EMBED_DATA; 2068 if (flags.compress) 2069 lzc_flags |= LZC_SEND_FLAG_COMPRESS; 2070 2071 if (flags.verbose) { 2072 uint64_t size = 0; 2073 err = lzc_send_space(zhp->zfs_name, from, lzc_flags, &size); 2074 if (err == 0) { 2075 send_print_verbose(fout, zhp->zfs_name, from, size, 2076 flags.parsable); 2077 if (flags.parsable) { 2078 (void) fprintf(fout, "size\t%llu\n", 2079 (longlong_t)size); 2080 } else { 2081 char buf[16]; 2082 zfs_nicenum(size, buf, sizeof (buf)); 2083 (void) fprintf(fout, dgettext(TEXT_DOMAIN, 2084 "total estimated size is %s\n"), buf); 2085 } 2086 } else { 2087 (void) fprintf(stderr, "Cannot estimate send size: " 2088 "%s\n", strerror(errno)); 2089 } 2090 } 2091 2092 if (flags.dryrun) 2093 return (err); 2094 2095 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN, 2096 "warning: cannot send '%s'"), zhp->zfs_name); 2097 2098 err = lzc_send(zhp->zfs_name, from, fd, lzc_flags); 2099 if (err != 0) { 2100 switch (errno) { 2101 case EXDEV: 2102 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 2103 "not an earlier snapshot from the same fs")); 2104 return (zfs_error(hdl, EZFS_CROSSTARGET, errbuf)); 2105 2106 case ENOENT: 2107 case ESRCH: 2108 if (lzc_exists(zhp->zfs_name)) { 2109 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 2110 "incremental source (%s) does not exist"), 2111 from); 2112 } 2113 return (zfs_error(hdl, EZFS_NOENT, errbuf)); 2114 2115 case EBUSY: 2116 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 2117 "target is busy; if a filesystem, " 2118 "it must not be mounted")); 2119 return (zfs_error(hdl, EZFS_BUSY, errbuf)); 2120 2121 case EDQUOT: 2122 case EFBIG: 2123 case EIO: 2124 case ENOLINK: 2125 case ENOSPC: 2126#ifdef illumos 2127 case ENOSTR: 2128#endif 2129 case ENXIO: 2130 case EPIPE: 2131 case ERANGE: 2132 case EFAULT: 2133 case EROFS: 2134 zfs_error_aux(hdl, strerror(errno)); 2135 return (zfs_error(hdl, EZFS_BADBACKUP, errbuf)); 2136 2137 default: 2138 return (zfs_standard_error(hdl, errno, errbuf)); 2139 } 2140 } 2141 return (err != 0); 2142} 2143 2144/* 2145 * Routines specific to "zfs recv" 2146 */ 2147 2148static int 2149recv_read(libzfs_handle_t *hdl, int fd, void *buf, int ilen, 2150 boolean_t byteswap, zio_cksum_t *zc) 2151{ 2152 char *cp = buf; 2153 int rv; 2154 int len = ilen; 2155 2156 assert(ilen <= SPA_MAXBLOCKSIZE); 2157 2158 do { 2159 rv = read(fd, cp, len); 2160 cp += rv; 2161 len -= rv; 2162 } while (rv > 0); 2163 2164 if (rv < 0 || len != 0) { 2165 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 2166 "failed to read from stream")); 2167 return (zfs_error(hdl, EZFS_BADSTREAM, dgettext(TEXT_DOMAIN, 2168 "cannot receive"))); 2169 } 2170 2171 if (zc) { 2172 if (byteswap) 2173 (void) fletcher_4_incremental_byteswap(buf, ilen, zc); 2174 else 2175 (void) fletcher_4_incremental_native(buf, ilen, zc); 2176 } 2177 return (0); 2178} 2179 2180static int 2181recv_read_nvlist(libzfs_handle_t *hdl, int fd, int len, nvlist_t **nvp, 2182 boolean_t byteswap, zio_cksum_t *zc) 2183{ 2184 char *buf; 2185 int err; 2186 2187 buf = zfs_alloc(hdl, len); 2188 if (buf == NULL) 2189 return (ENOMEM); 2190 2191 err = recv_read(hdl, fd, buf, len, byteswap, zc); 2192 if (err != 0) { 2193 free(buf); 2194 return (err); 2195 } 2196 2197 err = nvlist_unpack(buf, len, nvp, 0); 2198 free(buf); 2199 if (err != 0) { 2200 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "invalid " 2201 "stream (malformed nvlist)")); 2202 return (EINVAL); 2203 } 2204 return (0); 2205} 2206 2207static int 2208recv_rename(libzfs_handle_t *hdl, const char *name, const char *tryname, 2209 int baselen, char *newname, recvflags_t *flags) 2210{ 2211 static int seq; 2212 int err; 2213 prop_changelist_t *clp; 2214 zfs_handle_t *zhp; 2215 2216 zhp = zfs_open(hdl, name, ZFS_TYPE_DATASET); 2217 if (zhp == NULL) 2218 return (-1); 2219 clp = changelist_gather(zhp, ZFS_PROP_NAME, 0, 2220 flags->force ? MS_FORCE : 0); 2221 zfs_close(zhp); 2222 if (clp == NULL) 2223 return (-1); 2224 err = changelist_prefix(clp); 2225 if (err) 2226 return (err); 2227 2228 if (tryname) { 2229 (void) strcpy(newname, tryname); 2230 if (flags->verbose) { 2231 (void) printf("attempting rename %s to %s\n", 2232 name, newname); 2233 } 2234 err = lzc_rename(name, newname); 2235 if (err == 0) 2236 changelist_rename(clp, name, tryname); 2237 } else { 2238 err = ENOENT; 2239 } 2240 2241 if (err != 0 && strncmp(name + baselen, "recv-", 5) != 0) { 2242 seq++; 2243 2244 (void) snprintf(newname, ZFS_MAX_DATASET_NAME_LEN, 2245 "%.*srecv-%u-%u", baselen, name, getpid(), seq); 2246 if (flags->verbose) { 2247 (void) printf("failed - trying rename %s to %s\n", 2248 name, newname); 2249 } 2250 err = lzc_rename(name, newname); 2251 if (err == 0) 2252 changelist_rename(clp, name, newname); 2253 if (err && flags->verbose) { 2254 (void) printf("failed (%u) - " 2255 "will try again on next pass\n", errno); 2256 } 2257 err = EAGAIN; 2258 } else if (flags->verbose) { 2259 if (err == 0) 2260 (void) printf("success\n"); 2261 else 2262 (void) printf("failed (%u)\n", errno); 2263 } 2264 2265 (void) changelist_postfix(clp); 2266 changelist_free(clp); 2267 2268 return (err); 2269} 2270 2271static int 2272recv_destroy(libzfs_handle_t *hdl, const char *name, int baselen, 2273 char *newname, recvflags_t *flags) 2274{ 2275 int err = 0; 2276 prop_changelist_t *clp; 2277 zfs_handle_t *zhp; 2278 boolean_t defer = B_FALSE; 2279 int spa_version; 2280 2281 zhp = zfs_open(hdl, name, ZFS_TYPE_DATASET); 2282 if (zhp == NULL) 2283 return (-1); 2284 clp = changelist_gather(zhp, ZFS_PROP_NAME, 0, 2285 flags->force ? MS_FORCE : 0); 2286 if (zfs_get_type(zhp) == ZFS_TYPE_SNAPSHOT && 2287 zfs_spa_version(zhp, &spa_version) == 0 && 2288 spa_version >= SPA_VERSION_USERREFS) 2289 defer = B_TRUE; 2290 zfs_close(zhp); 2291 if (clp == NULL) 2292 return (-1); 2293 err = changelist_prefix(clp); 2294 if (err) 2295 return (err); 2296 2297 if (flags->verbose) 2298 (void) printf("attempting destroy %s\n", name); 2299 if (zhp->zfs_type == ZFS_TYPE_SNAPSHOT) { 2300 nvlist_t *nv = fnvlist_alloc(); 2301 fnvlist_add_boolean(nv, name); 2302 err = lzc_destroy_snaps(nv, defer, NULL); 2303 fnvlist_free(nv); 2304 } else { 2305 err = lzc_destroy(name); 2306 } 2307 if (err == 0) { 2308 if (flags->verbose) 2309 (void) printf("success\n"); 2310 changelist_remove(clp, name); 2311 } 2312 2313 (void) changelist_postfix(clp); 2314 changelist_free(clp); 2315 2316 /* 2317 * Deferred destroy might destroy the snapshot or only mark it to be 2318 * destroyed later, and it returns success in either case. 2319 */ 2320 if (err != 0 || (defer && zfs_dataset_exists(hdl, name, 2321 ZFS_TYPE_SNAPSHOT))) { 2322 err = recv_rename(hdl, name, NULL, baselen, newname, flags); 2323 } 2324 2325 return (err); 2326} 2327 2328typedef struct guid_to_name_data { 2329 uint64_t guid; 2330 boolean_t bookmark_ok; 2331 char *name; 2332 char *skip; 2333} guid_to_name_data_t; 2334 2335static int 2336guid_to_name_cb(zfs_handle_t *zhp, void *arg) 2337{ 2338 guid_to_name_data_t *gtnd = arg; 2339 const char *slash; 2340 int err; 2341 2342 if (gtnd->skip != NULL && 2343 (slash = strrchr(zhp->zfs_name, '/')) != NULL && 2344 strcmp(slash + 1, gtnd->skip) == 0) { 2345 zfs_close(zhp); 2346 return (0); 2347 } 2348 2349 if (zfs_prop_get_int(zhp, ZFS_PROP_GUID) == gtnd->guid) { 2350 (void) strcpy(gtnd->name, zhp->zfs_name); 2351 zfs_close(zhp); 2352 return (EEXIST); 2353 } 2354 2355 err = zfs_iter_children(zhp, guid_to_name_cb, gtnd); 2356 if (err != EEXIST && gtnd->bookmark_ok) 2357 err = zfs_iter_bookmarks(zhp, guid_to_name_cb, gtnd); 2358 zfs_close(zhp); 2359 return (err); 2360} 2361 2362/* 2363 * Attempt to find the local dataset associated with this guid. In the case of 2364 * multiple matches, we attempt to find the "best" match by searching 2365 * progressively larger portions of the hierarchy. This allows one to send a 2366 * tree of datasets individually and guarantee that we will find the source 2367 * guid within that hierarchy, even if there are multiple matches elsewhere. 2368 */ 2369static int 2370guid_to_name(libzfs_handle_t *hdl, const char *parent, uint64_t guid, 2371 boolean_t bookmark_ok, char *name) 2372{ 2373 char pname[ZFS_MAX_DATASET_NAME_LEN]; 2374 guid_to_name_data_t gtnd; 2375 2376 gtnd.guid = guid; 2377 gtnd.bookmark_ok = bookmark_ok; 2378 gtnd.name = name; 2379 gtnd.skip = NULL; 2380 2381 /* 2382 * Search progressively larger portions of the hierarchy, starting 2383 * with the filesystem specified by 'parent'. This will 2384 * select the "most local" version of the origin snapshot in the case 2385 * that there are multiple matching snapshots in the system. 2386 */ 2387 (void) strlcpy(pname, parent, sizeof (pname)); 2388 char *cp = strrchr(pname, '@'); 2389 if (cp == NULL) 2390 cp = strchr(pname, '\0'); 2391 for (; cp != NULL; cp = strrchr(pname, '/')) { 2392 /* Chop off the last component and open the parent */ 2393 *cp = '\0'; 2394 zfs_handle_t *zhp = make_dataset_handle(hdl, pname); 2395 2396 if (zhp == NULL) 2397 continue; 2398 int err = guid_to_name_cb(zfs_handle_dup(zhp), >nd); 2399 if (err != EEXIST) 2400 err = zfs_iter_children(zhp, guid_to_name_cb, >nd); 2401 if (err != EEXIST && bookmark_ok) 2402 err = zfs_iter_bookmarks(zhp, guid_to_name_cb, >nd); 2403 zfs_close(zhp); 2404 if (err == EEXIST) 2405 return (0); 2406 2407 /* 2408 * Remember the last portion of the dataset so we skip it next 2409 * time through (as we've already searched that portion of the 2410 * hierarchy). 2411 */ 2412 gtnd.skip = strrchr(pname, '/') + 1; 2413 } 2414 2415 return (ENOENT); 2416} 2417 2418/* 2419 * Return +1 if guid1 is before guid2, 0 if they are the same, and -1 if 2420 * guid1 is after guid2. 2421 */ 2422static int 2423created_before(libzfs_handle_t *hdl, avl_tree_t *avl, 2424 uint64_t guid1, uint64_t guid2) 2425{ 2426 nvlist_t *nvfs; 2427 char *fsname, *snapname; 2428 char buf[ZFS_MAX_DATASET_NAME_LEN]; 2429 int rv; 2430 zfs_handle_t *guid1hdl, *guid2hdl; 2431 uint64_t create1, create2; 2432 2433 if (guid2 == 0) 2434 return (0); 2435 if (guid1 == 0) 2436 return (1); 2437 2438 nvfs = fsavl_find(avl, guid1, &snapname); 2439 VERIFY(0 == nvlist_lookup_string(nvfs, "name", &fsname)); 2440 (void) snprintf(buf, sizeof (buf), "%s@%s", fsname, snapname); 2441 guid1hdl = zfs_open(hdl, buf, ZFS_TYPE_SNAPSHOT); 2442 if (guid1hdl == NULL) 2443 return (-1); 2444 2445 nvfs = fsavl_find(avl, guid2, &snapname); 2446 VERIFY(0 == nvlist_lookup_string(nvfs, "name", &fsname)); 2447 (void) snprintf(buf, sizeof (buf), "%s@%s", fsname, snapname); 2448 guid2hdl = zfs_open(hdl, buf, ZFS_TYPE_SNAPSHOT); 2449 if (guid2hdl == NULL) { 2450 zfs_close(guid1hdl); 2451 return (-1); 2452 } 2453 2454 create1 = zfs_prop_get_int(guid1hdl, ZFS_PROP_CREATETXG); 2455 create2 = zfs_prop_get_int(guid2hdl, ZFS_PROP_CREATETXG); 2456 2457 if (create1 < create2) 2458 rv = -1; 2459 else if (create1 > create2) 2460 rv = +1; 2461 else 2462 rv = 0; 2463 2464 zfs_close(guid1hdl); 2465 zfs_close(guid2hdl); 2466 2467 return (rv); 2468} 2469 2470static int 2471recv_incremental_replication(libzfs_handle_t *hdl, const char *tofs, 2472 recvflags_t *flags, nvlist_t *stream_nv, avl_tree_t *stream_avl, 2473 nvlist_t *renamed) 2474{ 2475 nvlist_t *local_nv, *deleted = NULL; 2476 avl_tree_t *local_avl; 2477 nvpair_t *fselem, *nextfselem; 2478 char *fromsnap; 2479 char newname[ZFS_MAX_DATASET_NAME_LEN]; 2480 char guidname[32]; 2481 int error; 2482 boolean_t needagain, progress, recursive; 2483 char *s1, *s2; 2484 2485 VERIFY(0 == nvlist_lookup_string(stream_nv, "fromsnap", &fromsnap)); 2486 2487 recursive = (nvlist_lookup_boolean(stream_nv, "not_recursive") == 2488 ENOENT); 2489 2490 if (flags->dryrun) 2491 return (0); 2492 2493again: 2494 needagain = progress = B_FALSE; 2495 2496 VERIFY(0 == nvlist_alloc(&deleted, NV_UNIQUE_NAME, 0)); 2497 2498 if ((error = gather_nvlist(hdl, tofs, fromsnap, NULL, 2499 recursive, recursive, B_FALSE, &local_nv, &local_avl)) != 0) 2500 return (error); 2501 2502 /* 2503 * Process deletes and renames 2504 */ 2505 for (fselem = nvlist_next_nvpair(local_nv, NULL); 2506 fselem; fselem = nextfselem) { 2507 nvlist_t *nvfs, *snaps; 2508 nvlist_t *stream_nvfs = NULL; 2509 nvpair_t *snapelem, *nextsnapelem; 2510 uint64_t fromguid = 0; 2511 uint64_t originguid = 0; 2512 uint64_t stream_originguid = 0; 2513 uint64_t parent_fromsnap_guid, stream_parent_fromsnap_guid; 2514 char *fsname, *stream_fsname; 2515 2516 nextfselem = nvlist_next_nvpair(local_nv, fselem); 2517 2518 VERIFY(0 == nvpair_value_nvlist(fselem, &nvfs)); 2519 VERIFY(0 == nvlist_lookup_nvlist(nvfs, "snaps", &snaps)); 2520 VERIFY(0 == nvlist_lookup_string(nvfs, "name", &fsname)); 2521 VERIFY(0 == nvlist_lookup_uint64(nvfs, "parentfromsnap", 2522 &parent_fromsnap_guid)); 2523 (void) nvlist_lookup_uint64(nvfs, "origin", &originguid); 2524 2525 /* 2526 * First find the stream's fs, so we can check for 2527 * a different origin (due to "zfs promote") 2528 */ 2529 for (snapelem = nvlist_next_nvpair(snaps, NULL); 2530 snapelem; snapelem = nvlist_next_nvpair(snaps, snapelem)) { 2531 uint64_t thisguid; 2532 2533 VERIFY(0 == nvpair_value_uint64(snapelem, &thisguid)); 2534 stream_nvfs = fsavl_find(stream_avl, thisguid, NULL); 2535 2536 if (stream_nvfs != NULL) 2537 break; 2538 } 2539 2540 /* check for promote */ 2541 (void) nvlist_lookup_uint64(stream_nvfs, "origin", 2542 &stream_originguid); 2543 if (stream_nvfs && originguid != stream_originguid) { 2544 switch (created_before(hdl, local_avl, 2545 stream_originguid, originguid)) { 2546 case 1: { 2547 /* promote it! */ 2548 zfs_cmd_t zc = { 0 }; 2549 nvlist_t *origin_nvfs; 2550 char *origin_fsname; 2551 2552 if (flags->verbose) 2553 (void) printf("promoting %s\n", fsname); 2554 2555 origin_nvfs = fsavl_find(local_avl, originguid, 2556 NULL); 2557 VERIFY(0 == nvlist_lookup_string(origin_nvfs, 2558 "name", &origin_fsname)); 2559 (void) strlcpy(zc.zc_value, origin_fsname, 2560 sizeof (zc.zc_value)); 2561 (void) strlcpy(zc.zc_name, fsname, 2562 sizeof (zc.zc_name)); 2563 error = zfs_ioctl(hdl, ZFS_IOC_PROMOTE, &zc); 2564 if (error == 0) 2565 progress = B_TRUE; 2566 break; 2567 } 2568 default: 2569 break; 2570 case -1: 2571 fsavl_destroy(local_avl); 2572 nvlist_free(local_nv); 2573 return (-1); 2574 } 2575 /* 2576 * We had/have the wrong origin, therefore our 2577 * list of snapshots is wrong. Need to handle 2578 * them on the next pass. 2579 */ 2580 needagain = B_TRUE; 2581 continue; 2582 } 2583 2584 for (snapelem = nvlist_next_nvpair(snaps, NULL); 2585 snapelem; snapelem = nextsnapelem) { 2586 uint64_t thisguid; 2587 char *stream_snapname; 2588 nvlist_t *found, *props; 2589 2590 nextsnapelem = nvlist_next_nvpair(snaps, snapelem); 2591 2592 VERIFY(0 == nvpair_value_uint64(snapelem, &thisguid)); 2593 found = fsavl_find(stream_avl, thisguid, 2594 &stream_snapname); 2595 2596 /* check for delete */ 2597 if (found == NULL) { 2598 char name[ZFS_MAX_DATASET_NAME_LEN]; 2599 2600 if (!flags->force) 2601 continue; 2602 2603 (void) snprintf(name, sizeof (name), "%s@%s", 2604 fsname, nvpair_name(snapelem)); 2605 2606 error = recv_destroy(hdl, name, 2607 strlen(fsname)+1, newname, flags); 2608 if (error) 2609 needagain = B_TRUE; 2610 else 2611 progress = B_TRUE; 2612 sprintf(guidname, "%" PRIu64, thisguid); 2613 nvlist_add_boolean(deleted, guidname); 2614 continue; 2615 } 2616 2617 stream_nvfs = found; 2618 2619 if (0 == nvlist_lookup_nvlist(stream_nvfs, "snapprops", 2620 &props) && 0 == nvlist_lookup_nvlist(props, 2621 stream_snapname, &props)) { 2622 zfs_cmd_t zc = { 0 }; 2623 2624 zc.zc_cookie = B_TRUE; /* received */ 2625 (void) snprintf(zc.zc_name, sizeof (zc.zc_name), 2626 "%s@%s", fsname, nvpair_name(snapelem)); 2627 if (zcmd_write_src_nvlist(hdl, &zc, 2628 props) == 0) { 2629 (void) zfs_ioctl(hdl, 2630 ZFS_IOC_SET_PROP, &zc); 2631 zcmd_free_nvlists(&zc); 2632 } 2633 } 2634 2635 /* check for different snapname */ 2636 if (strcmp(nvpair_name(snapelem), 2637 stream_snapname) != 0) { 2638 char name[ZFS_MAX_DATASET_NAME_LEN]; 2639 char tryname[ZFS_MAX_DATASET_NAME_LEN]; 2640 2641 (void) snprintf(name, sizeof (name), "%s@%s", 2642 fsname, nvpair_name(snapelem)); 2643 (void) snprintf(tryname, sizeof (name), "%s@%s", 2644 fsname, stream_snapname); 2645 2646 error = recv_rename(hdl, name, tryname, 2647 strlen(fsname)+1, newname, flags); 2648 if (error) 2649 needagain = B_TRUE; 2650 else 2651 progress = B_TRUE; 2652 } 2653 2654 if (strcmp(stream_snapname, fromsnap) == 0) 2655 fromguid = thisguid; 2656 } 2657 2658 /* check for delete */ 2659 if (stream_nvfs == NULL) { 2660 if (!flags->force) 2661 continue; 2662 2663 error = recv_destroy(hdl, fsname, strlen(tofs)+1, 2664 newname, flags); 2665 if (error) 2666 needagain = B_TRUE; 2667 else 2668 progress = B_TRUE; 2669 sprintf(guidname, "%" PRIu64, parent_fromsnap_guid); 2670 nvlist_add_boolean(deleted, guidname); 2671 continue; 2672 } 2673 2674 if (fromguid == 0) { 2675 if (flags->verbose) { 2676 (void) printf("local fs %s does not have " 2677 "fromsnap (%s in stream); must have " 2678 "been deleted locally; ignoring\n", 2679 fsname, fromsnap); 2680 } 2681 continue; 2682 } 2683 2684 VERIFY(0 == nvlist_lookup_string(stream_nvfs, 2685 "name", &stream_fsname)); 2686 VERIFY(0 == nvlist_lookup_uint64(stream_nvfs, 2687 "parentfromsnap", &stream_parent_fromsnap_guid)); 2688 2689 s1 = strrchr(fsname, '/'); 2690 s2 = strrchr(stream_fsname, '/'); 2691 2692 /* 2693 * Check if we're going to rename based on parent guid change 2694 * and the current parent guid was also deleted. If it was then 2695 * rename will fail and is likely unneeded, so avoid this and 2696 * force an early retry to determine the new 2697 * parent_fromsnap_guid. 2698 */ 2699 if (stream_parent_fromsnap_guid != 0 && 2700 parent_fromsnap_guid != 0 && 2701 stream_parent_fromsnap_guid != parent_fromsnap_guid) { 2702 sprintf(guidname, "%" PRIu64, parent_fromsnap_guid); 2703 if (nvlist_exists(deleted, guidname)) { 2704 progress = B_TRUE; 2705 needagain = B_TRUE; 2706 goto doagain; 2707 } 2708 } 2709 2710 /* 2711 * Check for rename. If the exact receive path is specified, it 2712 * does not count as a rename, but we still need to check the 2713 * datasets beneath it. 2714 */ 2715 if ((stream_parent_fromsnap_guid != 0 && 2716 parent_fromsnap_guid != 0 && 2717 stream_parent_fromsnap_guid != parent_fromsnap_guid) || 2718 ((flags->isprefix || strcmp(tofs, fsname) != 0) && 2719 (s1 != NULL) && (s2 != NULL) && strcmp(s1, s2) != 0)) { 2720 nvlist_t *parent; 2721 char tryname[ZFS_MAX_DATASET_NAME_LEN]; 2722 2723 parent = fsavl_find(local_avl, 2724 stream_parent_fromsnap_guid, NULL); 2725 /* 2726 * NB: parent might not be found if we used the 2727 * tosnap for stream_parent_fromsnap_guid, 2728 * because the parent is a newly-created fs; 2729 * we'll be able to rename it after we recv the 2730 * new fs. 2731 */ 2732 if (parent != NULL) { 2733 char *pname; 2734 2735 VERIFY(0 == nvlist_lookup_string(parent, "name", 2736 &pname)); 2737 (void) snprintf(tryname, sizeof (tryname), 2738 "%s%s", pname, strrchr(stream_fsname, '/')); 2739 } else { 2740 tryname[0] = '\0'; 2741 if (flags->verbose) { 2742 (void) printf("local fs %s new parent " 2743 "not found\n", fsname); 2744 } 2745 } 2746 2747 newname[0] = '\0'; 2748 2749 error = recv_rename(hdl, fsname, tryname, 2750 strlen(tofs)+1, newname, flags); 2751 2752 if (renamed != NULL && newname[0] != '\0') { 2753 VERIFY(0 == nvlist_add_boolean(renamed, 2754 newname)); 2755 } 2756 2757 if (error) 2758 needagain = B_TRUE; 2759 else 2760 progress = B_TRUE; 2761 } 2762 } 2763 2764doagain: 2765 fsavl_destroy(local_avl); 2766 nvlist_free(local_nv); 2767 nvlist_free(deleted); 2768 2769 if (needagain && progress) { 2770 /* do another pass to fix up temporary names */ 2771 if (flags->verbose) 2772 (void) printf("another pass:\n"); 2773 goto again; 2774 } 2775 2776 return (needagain); 2777} 2778 2779static int 2780zfs_receive_package(libzfs_handle_t *hdl, int fd, const char *destname, 2781 recvflags_t *flags, dmu_replay_record_t *drr, zio_cksum_t *zc, 2782 char **top_zfs, int cleanup_fd, uint64_t *action_handlep) 2783{ 2784 nvlist_t *stream_nv = NULL; 2785 avl_tree_t *stream_avl = NULL; 2786 char *fromsnap = NULL; 2787 char *sendsnap = NULL; 2788 char *cp; 2789 char tofs[ZFS_MAX_DATASET_NAME_LEN]; 2790 char sendfs[ZFS_MAX_DATASET_NAME_LEN]; 2791 char errbuf[1024]; 2792 dmu_replay_record_t drre; 2793 int error; 2794 boolean_t anyerr = B_FALSE; 2795 boolean_t softerr = B_FALSE; 2796 boolean_t recursive; 2797 2798 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN, 2799 "cannot receive")); 2800 2801 assert(drr->drr_type == DRR_BEGIN); 2802 assert(drr->drr_u.drr_begin.drr_magic == DMU_BACKUP_MAGIC); 2803 assert(DMU_GET_STREAM_HDRTYPE(drr->drr_u.drr_begin.drr_versioninfo) == 2804 DMU_COMPOUNDSTREAM); 2805 2806 /* 2807 * Read in the nvlist from the stream. 2808 */ 2809 if (drr->drr_payloadlen != 0) { 2810 error = recv_read_nvlist(hdl, fd, drr->drr_payloadlen, 2811 &stream_nv, flags->byteswap, zc); 2812 if (error) { 2813 error = zfs_error(hdl, EZFS_BADSTREAM, errbuf); 2814 goto out; 2815 } 2816 } 2817 2818 recursive = (nvlist_lookup_boolean(stream_nv, "not_recursive") == 2819 ENOENT); 2820 2821 if (recursive && strchr(destname, '@')) { 2822 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 2823 "cannot specify snapshot name for multi-snapshot stream")); 2824 error = zfs_error(hdl, EZFS_BADSTREAM, errbuf); 2825 goto out; 2826 } 2827 2828 /* 2829 * Read in the end record and verify checksum. 2830 */ 2831 if (0 != (error = recv_read(hdl, fd, &drre, sizeof (drre), 2832 flags->byteswap, NULL))) 2833 goto out; 2834 if (flags->byteswap) { 2835 drre.drr_type = BSWAP_32(drre.drr_type); 2836 drre.drr_u.drr_end.drr_checksum.zc_word[0] = 2837 BSWAP_64(drre.drr_u.drr_end.drr_checksum.zc_word[0]); 2838 drre.drr_u.drr_end.drr_checksum.zc_word[1] = 2839 BSWAP_64(drre.drr_u.drr_end.drr_checksum.zc_word[1]); 2840 drre.drr_u.drr_end.drr_checksum.zc_word[2] = 2841 BSWAP_64(drre.drr_u.drr_end.drr_checksum.zc_word[2]); 2842 drre.drr_u.drr_end.drr_checksum.zc_word[3] = 2843 BSWAP_64(drre.drr_u.drr_end.drr_checksum.zc_word[3]); 2844 } 2845 if (drre.drr_type != DRR_END) { 2846 error = zfs_error(hdl, EZFS_BADSTREAM, errbuf); 2847 goto out; 2848 } 2849 if (!ZIO_CHECKSUM_EQUAL(drre.drr_u.drr_end.drr_checksum, *zc)) { 2850 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 2851 "incorrect header checksum")); 2852 error = zfs_error(hdl, EZFS_BADSTREAM, errbuf); 2853 goto out; 2854 } 2855 2856 (void) nvlist_lookup_string(stream_nv, "fromsnap", &fromsnap); 2857 2858 if (drr->drr_payloadlen != 0) { 2859 nvlist_t *stream_fss; 2860 2861 VERIFY(0 == nvlist_lookup_nvlist(stream_nv, "fss", 2862 &stream_fss)); 2863 if ((stream_avl = fsavl_create(stream_fss)) == NULL) { 2864 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 2865 "couldn't allocate avl tree")); 2866 error = zfs_error(hdl, EZFS_NOMEM, errbuf); 2867 goto out; 2868 } 2869 2870 if (fromsnap != NULL && recursive) { 2871 nvlist_t *renamed = NULL; 2872 nvpair_t *pair = NULL; 2873 2874 (void) strlcpy(tofs, destname, sizeof (tofs)); 2875 if (flags->isprefix) { 2876 struct drr_begin *drrb = &drr->drr_u.drr_begin; 2877 int i; 2878 2879 if (flags->istail) { 2880 cp = strrchr(drrb->drr_toname, '/'); 2881 if (cp == NULL) { 2882 (void) strlcat(tofs, "/", 2883 sizeof (tofs)); 2884 i = 0; 2885 } else { 2886 i = (cp - drrb->drr_toname); 2887 } 2888 } else { 2889 i = strcspn(drrb->drr_toname, "/@"); 2890 } 2891 /* zfs_receive_one() will create_parents() */ 2892 (void) strlcat(tofs, &drrb->drr_toname[i], 2893 sizeof (tofs)); 2894 *strchr(tofs, '@') = '\0'; 2895 } 2896 2897 if (!flags->dryrun && !flags->nomount) { 2898 VERIFY(0 == nvlist_alloc(&renamed, 2899 NV_UNIQUE_NAME, 0)); 2900 } 2901 2902 softerr = recv_incremental_replication(hdl, tofs, flags, 2903 stream_nv, stream_avl, renamed); 2904 2905 /* Unmount renamed filesystems before receiving. */ 2906 while ((pair = nvlist_next_nvpair(renamed, 2907 pair)) != NULL) { 2908 zfs_handle_t *zhp; 2909 prop_changelist_t *clp = NULL; 2910 2911 zhp = zfs_open(hdl, nvpair_name(pair), 2912 ZFS_TYPE_FILESYSTEM); 2913 if (zhp != NULL) { 2914 clp = changelist_gather(zhp, 2915 ZFS_PROP_MOUNTPOINT, 0, 0); 2916 zfs_close(zhp); 2917 if (clp != NULL) { 2918 softerr |= 2919 changelist_prefix(clp); 2920 changelist_free(clp); 2921 } 2922 } 2923 } 2924 2925 nvlist_free(renamed); 2926 } 2927 } 2928 2929 /* 2930 * Get the fs specified by the first path in the stream (the top level 2931 * specified by 'zfs send') and pass it to each invocation of 2932 * zfs_receive_one(). 2933 */ 2934 (void) strlcpy(sendfs, drr->drr_u.drr_begin.drr_toname, 2935 sizeof (sendfs)); 2936 if ((cp = strchr(sendfs, '@')) != NULL) { 2937 *cp = '\0'; 2938 /* 2939 * Find the "sendsnap", the final snapshot in a replication 2940 * stream. zfs_receive_one() handles certain errors 2941 * differently, depending on if the contained stream is the 2942 * last one or not. 2943 */ 2944 sendsnap = (cp + 1); 2945 } 2946 2947 /* Finally, receive each contained stream */ 2948 do { 2949 /* 2950 * we should figure out if it has a recoverable 2951 * error, in which case do a recv_skip() and drive on. 2952 * Note, if we fail due to already having this guid, 2953 * zfs_receive_one() will take care of it (ie, 2954 * recv_skip() and return 0). 2955 */ 2956 error = zfs_receive_impl(hdl, destname, NULL, flags, fd, 2957 sendfs, stream_nv, stream_avl, top_zfs, cleanup_fd, 2958 action_handlep, sendsnap); 2959 if (error == ENODATA) { 2960 error = 0; 2961 break; 2962 } 2963 anyerr |= error; 2964 } while (error == 0); 2965 2966 if (drr->drr_payloadlen != 0 && recursive && fromsnap != NULL) { 2967 /* 2968 * Now that we have the fs's they sent us, try the 2969 * renames again. 2970 */ 2971 softerr = recv_incremental_replication(hdl, tofs, flags, 2972 stream_nv, stream_avl, NULL); 2973 } 2974 2975out: 2976 fsavl_destroy(stream_avl); 2977 nvlist_free(stream_nv); 2978 if (softerr) 2979 error = -2; 2980 if (anyerr) 2981 error = -1; 2982 return (error); 2983} 2984 2985static void 2986trunc_prop_errs(int truncated) 2987{ 2988 ASSERT(truncated != 0); 2989 2990 if (truncated == 1) 2991 (void) fprintf(stderr, dgettext(TEXT_DOMAIN, 2992 "1 more property could not be set\n")); 2993 else 2994 (void) fprintf(stderr, dgettext(TEXT_DOMAIN, 2995 "%d more properties could not be set\n"), truncated); 2996} 2997 2998static int 2999recv_skip(libzfs_handle_t *hdl, int fd, boolean_t byteswap) 3000{ 3001 dmu_replay_record_t *drr; 3002 void *buf = zfs_alloc(hdl, SPA_MAXBLOCKSIZE); 3003 char errbuf[1024]; 3004 3005 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN, 3006 "cannot receive:")); 3007 3008 /* XXX would be great to use lseek if possible... */ 3009 drr = buf; 3010 3011 while (recv_read(hdl, fd, drr, sizeof (dmu_replay_record_t), 3012 byteswap, NULL) == 0) { 3013 if (byteswap) 3014 drr->drr_type = BSWAP_32(drr->drr_type); 3015 3016 switch (drr->drr_type) { 3017 case DRR_BEGIN: 3018 if (drr->drr_payloadlen != 0) { 3019 (void) recv_read(hdl, fd, buf, 3020 drr->drr_payloadlen, B_FALSE, NULL); 3021 } 3022 break; 3023 3024 case DRR_END: 3025 free(buf); 3026 return (0); 3027 3028 case DRR_OBJECT: 3029 if (byteswap) { 3030 drr->drr_u.drr_object.drr_bonuslen = 3031 BSWAP_32(drr->drr_u.drr_object. 3032 drr_bonuslen); 3033 } 3034 (void) recv_read(hdl, fd, buf, 3035 P2ROUNDUP(drr->drr_u.drr_object.drr_bonuslen, 8), 3036 B_FALSE, NULL); 3037 break; 3038 3039 case DRR_WRITE: 3040 if (byteswap) { 3041 drr->drr_u.drr_write.drr_logical_size = 3042 BSWAP_64( 3043 drr->drr_u.drr_write.drr_logical_size); 3044 drr->drr_u.drr_write.drr_compressed_size = 3045 BSWAP_64( 3046 drr->drr_u.drr_write.drr_compressed_size); 3047 } 3048 uint64_t payload_size = 3049 DRR_WRITE_PAYLOAD_SIZE(&drr->drr_u.drr_write); 3050 (void) recv_read(hdl, fd, buf, 3051 payload_size, B_FALSE, NULL); 3052 break; 3053 case DRR_SPILL: 3054 if (byteswap) { 3055 drr->drr_u.drr_spill.drr_length = 3056 BSWAP_64(drr->drr_u.drr_spill.drr_length); 3057 } 3058 (void) recv_read(hdl, fd, buf, 3059 drr->drr_u.drr_spill.drr_length, B_FALSE, NULL); 3060 break; 3061 case DRR_WRITE_EMBEDDED: 3062 if (byteswap) { 3063 drr->drr_u.drr_write_embedded.drr_psize = 3064 BSWAP_32(drr->drr_u.drr_write_embedded. 3065 drr_psize); 3066 } 3067 (void) recv_read(hdl, fd, buf, 3068 P2ROUNDUP(drr->drr_u.drr_write_embedded.drr_psize, 3069 8), B_FALSE, NULL); 3070 break; 3071 case DRR_WRITE_BYREF: 3072 case DRR_FREEOBJECTS: 3073 case DRR_FREE: 3074 break; 3075 3076 default: 3077 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 3078 "invalid record type")); 3079 return (zfs_error(hdl, EZFS_BADSTREAM, errbuf)); 3080 } 3081 } 3082 3083 free(buf); 3084 return (-1); 3085} 3086 3087static void 3088recv_ecksum_set_aux(libzfs_handle_t *hdl, const char *target_snap, 3089 boolean_t resumable) 3090{ 3091 char target_fs[ZFS_MAX_DATASET_NAME_LEN]; 3092 3093 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 3094 "checksum mismatch or incomplete stream")); 3095 3096 if (!resumable) 3097 return; 3098 (void) strlcpy(target_fs, target_snap, sizeof (target_fs)); 3099 *strchr(target_fs, '@') = '\0'; 3100 zfs_handle_t *zhp = zfs_open(hdl, target_fs, 3101 ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME); 3102 if (zhp == NULL) 3103 return; 3104 3105 char token_buf[ZFS_MAXPROPLEN]; 3106 int error = zfs_prop_get(zhp, ZFS_PROP_RECEIVE_RESUME_TOKEN, 3107 token_buf, sizeof (token_buf), 3108 NULL, NULL, 0, B_TRUE); 3109 if (error == 0) { 3110 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 3111 "checksum mismatch or incomplete stream.\n" 3112 "Partially received snapshot is saved.\n" 3113 "A resuming stream can be generated on the sending " 3114 "system by running:\n" 3115 " zfs send -t %s"), 3116 token_buf); 3117 } 3118 zfs_close(zhp); 3119} 3120 3121/* 3122 * Restores a backup of tosnap from the file descriptor specified by infd. 3123 */ 3124static int 3125zfs_receive_one(libzfs_handle_t *hdl, int infd, const char *tosnap, 3126 const char *originsnap, recvflags_t *flags, dmu_replay_record_t *drr, 3127 dmu_replay_record_t *drr_noswap, const char *sendfs, nvlist_t *stream_nv, 3128 avl_tree_t *stream_avl, char **top_zfs, int cleanup_fd, 3129 uint64_t *action_handlep, const char *finalsnap) 3130{ 3131 zfs_cmd_t zc = { 0 }; 3132 time_t begin_time; 3133 int ioctl_err, ioctl_errno, err; 3134 char *cp; 3135 struct drr_begin *drrb = &drr->drr_u.drr_begin; 3136 char errbuf[1024]; 3137 char prop_errbuf[1024]; 3138 const char *chopprefix; 3139 boolean_t newfs = B_FALSE; 3140 boolean_t stream_wantsnewfs, stream_resumingnewfs; 3141 uint64_t parent_snapguid = 0; 3142 prop_changelist_t *clp = NULL; 3143 nvlist_t *snapprops_nvlist = NULL; 3144 zprop_errflags_t prop_errflags; 3145 boolean_t recursive; 3146 char *snapname = NULL; 3147 3148 begin_time = time(NULL); 3149 3150 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN, 3151 "cannot receive")); 3152 3153 recursive = (nvlist_lookup_boolean(stream_nv, "not_recursive") == 3154 ENOENT); 3155 3156 if (stream_avl != NULL) { 3157 nvlist_t *fs = fsavl_find(stream_avl, drrb->drr_toguid, 3158 &snapname); 3159 nvlist_t *props; 3160 int ret; 3161 3162 (void) nvlist_lookup_uint64(fs, "parentfromsnap", 3163 &parent_snapguid); 3164 err = nvlist_lookup_nvlist(fs, "props", &props); 3165 if (err) 3166 VERIFY(0 == nvlist_alloc(&props, NV_UNIQUE_NAME, 0)); 3167 3168 if (flags->canmountoff) { 3169 VERIFY(0 == nvlist_add_uint64(props, 3170 zfs_prop_to_name(ZFS_PROP_CANMOUNT), 0)); 3171 } 3172 ret = zcmd_write_src_nvlist(hdl, &zc, props); 3173 if (err) 3174 nvlist_free(props); 3175 3176 if (0 == nvlist_lookup_nvlist(fs, "snapprops", &props)) { 3177 VERIFY(0 == nvlist_lookup_nvlist(props, 3178 snapname, &snapprops_nvlist)); 3179 } 3180 3181 if (ret != 0) 3182 return (-1); 3183 } 3184 3185 cp = NULL; 3186 3187 /* 3188 * Determine how much of the snapshot name stored in the stream 3189 * we are going to tack on to the name they specified on the 3190 * command line, and how much we are going to chop off. 3191 * 3192 * If they specified a snapshot, chop the entire name stored in 3193 * the stream. 3194 */ 3195 if (flags->istail) { 3196 /* 3197 * A filesystem was specified with -e. We want to tack on only 3198 * the tail of the sent snapshot path. 3199 */ 3200 if (strchr(tosnap, '@')) { 3201 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "invalid " 3202 "argument - snapshot not allowed with -e")); 3203 return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf)); 3204 } 3205 3206 chopprefix = strrchr(sendfs, '/'); 3207 3208 if (chopprefix == NULL) { 3209 /* 3210 * The tail is the poolname, so we need to 3211 * prepend a path separator. 3212 */ 3213 int len = strlen(drrb->drr_toname); 3214 cp = malloc(len + 2); 3215 cp[0] = '/'; 3216 (void) strcpy(&cp[1], drrb->drr_toname); 3217 chopprefix = cp; 3218 } else { 3219 chopprefix = drrb->drr_toname + (chopprefix - sendfs); 3220 } 3221 } else if (flags->isprefix) { 3222 /* 3223 * A filesystem was specified with -d. We want to tack on 3224 * everything but the first element of the sent snapshot path 3225 * (all but the pool name). 3226 */ 3227 if (strchr(tosnap, '@')) { 3228 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "invalid " 3229 "argument - snapshot not allowed with -d")); 3230 return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf)); 3231 } 3232 3233 chopprefix = strchr(drrb->drr_toname, '/'); 3234 if (chopprefix == NULL) 3235 chopprefix = strchr(drrb->drr_toname, '@'); 3236 } else if (strchr(tosnap, '@') == NULL) { 3237 /* 3238 * If a filesystem was specified without -d or -e, we want to 3239 * tack on everything after the fs specified by 'zfs send'. 3240 */ 3241 chopprefix = drrb->drr_toname + strlen(sendfs); 3242 } else { 3243 /* A snapshot was specified as an exact path (no -d or -e). */ 3244 if (recursive) { 3245 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 3246 "cannot specify snapshot name for multi-snapshot " 3247 "stream")); 3248 return (zfs_error(hdl, EZFS_BADSTREAM, errbuf)); 3249 } 3250 chopprefix = drrb->drr_toname + strlen(drrb->drr_toname); 3251 } 3252 3253 ASSERT(strstr(drrb->drr_toname, sendfs) == drrb->drr_toname); 3254 ASSERT(chopprefix > drrb->drr_toname); 3255 ASSERT(chopprefix <= drrb->drr_toname + strlen(drrb->drr_toname)); 3256 ASSERT(chopprefix[0] == '/' || chopprefix[0] == '@' || 3257 chopprefix[0] == '\0'); 3258 3259 /* 3260 * Determine name of destination snapshot, store in zc_value. 3261 */ 3262 (void) strcpy(zc.zc_value, tosnap); 3263 (void) strncat(zc.zc_value, chopprefix, sizeof (zc.zc_value)); 3264#ifdef __FreeBSD__ 3265 if (zfs_ioctl_version == ZFS_IOCVER_UNDEF) 3266 zfs_ioctl_version = get_zfs_ioctl_version(); 3267 /* 3268 * For forward compatibility hide tosnap in zc_value 3269 */ 3270 if (zfs_ioctl_version < ZFS_IOCVER_LZC) 3271 (void) strcpy(zc.zc_value + strlen(zc.zc_value) + 1, tosnap); 3272#endif 3273 free(cp); 3274 if (!zfs_name_valid(zc.zc_value, ZFS_TYPE_SNAPSHOT)) { 3275 zcmd_free_nvlists(&zc); 3276 return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf)); 3277 } 3278 3279 /* 3280 * Determine the name of the origin snapshot, store in zc_string. 3281 */ 3282 if (originsnap) { 3283 (void) strncpy(zc.zc_string, originsnap, sizeof (zc.zc_string)); 3284 if (flags->verbose) 3285 (void) printf("using provided clone origin %s\n", 3286 zc.zc_string); 3287 } else if (drrb->drr_flags & DRR_FLAG_CLONE) { 3288 if (guid_to_name(hdl, zc.zc_value, 3289 drrb->drr_fromguid, B_FALSE, zc.zc_string) != 0) { 3290 zcmd_free_nvlists(&zc); 3291 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 3292 "local origin for clone %s does not exist"), 3293 zc.zc_value); 3294 return (zfs_error(hdl, EZFS_NOENT, errbuf)); 3295 } 3296 if (flags->verbose) 3297 (void) printf("found clone origin %s\n", zc.zc_string); 3298 } 3299 3300 boolean_t resuming = DMU_GET_FEATUREFLAGS(drrb->drr_versioninfo) & 3301 DMU_BACKUP_FEATURE_RESUMING; 3302 stream_wantsnewfs = (drrb->drr_fromguid == 0 || 3303 (drrb->drr_flags & DRR_FLAG_CLONE) || originsnap) && !resuming; 3304 stream_resumingnewfs = (drrb->drr_fromguid == 0 || 3305 (drrb->drr_flags & DRR_FLAG_CLONE) || originsnap) && resuming; 3306 3307 if (stream_wantsnewfs) { 3308 /* 3309 * if the parent fs does not exist, look for it based on 3310 * the parent snap GUID 3311 */ 3312 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN, 3313 "cannot receive new filesystem stream")); 3314 3315 (void) strcpy(zc.zc_name, zc.zc_value); 3316 cp = strrchr(zc.zc_name, '/'); 3317 if (cp) 3318 *cp = '\0'; 3319 if (cp && 3320 !zfs_dataset_exists(hdl, zc.zc_name, ZFS_TYPE_DATASET)) { 3321 char suffix[ZFS_MAX_DATASET_NAME_LEN]; 3322 (void) strcpy(suffix, strrchr(zc.zc_value, '/')); 3323 if (guid_to_name(hdl, zc.zc_name, parent_snapguid, 3324 B_FALSE, zc.zc_value) == 0) { 3325 *strchr(zc.zc_value, '@') = '\0'; 3326 (void) strcat(zc.zc_value, suffix); 3327 } 3328 } 3329 } else { 3330 /* 3331 * If the fs does not exist, look for it based on the 3332 * fromsnap GUID. 3333 */ 3334 if (resuming) { 3335 (void) snprintf(errbuf, sizeof (errbuf), 3336 dgettext(TEXT_DOMAIN, 3337 "cannot receive resume stream")); 3338 } else { 3339 (void) snprintf(errbuf, sizeof (errbuf), 3340 dgettext(TEXT_DOMAIN, 3341 "cannot receive incremental stream")); 3342 } 3343 3344 (void) strcpy(zc.zc_name, zc.zc_value); 3345 *strchr(zc.zc_name, '@') = '\0'; 3346 3347 /* 3348 * If the exact receive path was specified and this is the 3349 * topmost path in the stream, then if the fs does not exist we 3350 * should look no further. 3351 */ 3352 if ((flags->isprefix || (*(chopprefix = drrb->drr_toname + 3353 strlen(sendfs)) != '\0' && *chopprefix != '@')) && 3354 !zfs_dataset_exists(hdl, zc.zc_name, ZFS_TYPE_DATASET)) { 3355 char snap[ZFS_MAX_DATASET_NAME_LEN]; 3356 (void) strcpy(snap, strchr(zc.zc_value, '@')); 3357 if (guid_to_name(hdl, zc.zc_name, drrb->drr_fromguid, 3358 B_FALSE, zc.zc_value) == 0) { 3359 *strchr(zc.zc_value, '@') = '\0'; 3360 (void) strcat(zc.zc_value, snap); 3361 } 3362 } 3363 } 3364 3365 (void) strcpy(zc.zc_name, zc.zc_value); 3366 *strchr(zc.zc_name, '@') = '\0'; 3367 3368 if (zfs_dataset_exists(hdl, zc.zc_name, ZFS_TYPE_DATASET)) { 3369 zfs_handle_t *zhp; 3370 3371 /* 3372 * Destination fs exists. It must be one of these cases: 3373 * - an incremental send stream 3374 * - the stream specifies a new fs (full stream or clone) 3375 * and they want us to blow away the existing fs (and 3376 * have therefore specified -F and removed any snapshots) 3377 * - we are resuming a failed receive. 3378 */ 3379 if (stream_wantsnewfs) { 3380 boolean_t is_volume = drrb->drr_type == DMU_OST_ZVOL; 3381 if (!flags->force) { 3382 zcmd_free_nvlists(&zc); 3383 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 3384 "destination '%s' exists\n" 3385 "must specify -F to overwrite it"), 3386 zc.zc_name); 3387 return (zfs_error(hdl, EZFS_EXISTS, errbuf)); 3388 } 3389 if (ioctl(hdl->libzfs_fd, ZFS_IOC_SNAPSHOT_LIST_NEXT, 3390 &zc) == 0) { 3391 zcmd_free_nvlists(&zc); 3392 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 3393 "destination has snapshots (eg. %s)\n" 3394 "must destroy them to overwrite it"), 3395 zc.zc_name); 3396 return (zfs_error(hdl, EZFS_EXISTS, errbuf)); 3397 } 3398 if (is_volume && strrchr(zc.zc_name, '/') == NULL) { 3399 zcmd_free_nvlists(&zc); 3400 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 3401 "destination '%s' is the root dataset\n" 3402 "cannot overwrite with a ZVOL"), 3403 zc.zc_name); 3404 return (zfs_error(hdl, EZFS_EXISTS, errbuf)); 3405 } 3406 if (is_volume && 3407 ioctl(hdl->libzfs_fd, ZFS_IOC_DATASET_LIST_NEXT, 3408 &zc) == 0) { 3409 zcmd_free_nvlists(&zc); 3410 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 3411 "destination has children (eg. %s)\n" 3412 "cannot overwrite with a ZVOL"), 3413 zc.zc_name); 3414 return (zfs_error(hdl, EZFS_WRONG_PARENT, 3415 errbuf)); 3416 } 3417 } 3418 3419 if ((zhp = zfs_open(hdl, zc.zc_name, 3420 ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME)) == NULL) { 3421 zcmd_free_nvlists(&zc); 3422 return (-1); 3423 } 3424 3425 if (stream_wantsnewfs && 3426 zhp->zfs_dmustats.dds_origin[0]) { 3427 zcmd_free_nvlists(&zc); 3428 zfs_close(zhp); 3429 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 3430 "destination '%s' is a clone\n" 3431 "must destroy it to overwrite it"), 3432 zc.zc_name); 3433 return (zfs_error(hdl, EZFS_EXISTS, errbuf)); 3434 } 3435 3436 if (!flags->dryrun && zhp->zfs_type == ZFS_TYPE_FILESYSTEM && 3437 (stream_wantsnewfs || stream_resumingnewfs)) { 3438 /* We can't do online recv in this case */ 3439 clp = changelist_gather(zhp, ZFS_PROP_NAME, 0, 0); 3440 if (clp == NULL) { 3441 zfs_close(zhp); 3442 zcmd_free_nvlists(&zc); 3443 return (-1); 3444 } 3445 if (changelist_prefix(clp) != 0) { 3446 changelist_free(clp); 3447 zfs_close(zhp); 3448 zcmd_free_nvlists(&zc); 3449 return (-1); 3450 } 3451 } 3452 3453 /* 3454 * If we are resuming a newfs, set newfs here so that we will 3455 * mount it if the recv succeeds this time. We can tell 3456 * that it was a newfs on the first recv because the fs 3457 * itself will be inconsistent (if the fs existed when we 3458 * did the first recv, we would have received it into 3459 * .../%recv). 3460 */ 3461 if (resuming && zfs_prop_get_int(zhp, ZFS_PROP_INCONSISTENT)) 3462 newfs = B_TRUE; 3463 3464 zfs_close(zhp); 3465 } else { 3466 zfs_handle_t *zhp; 3467 3468 /* 3469 * Destination filesystem does not exist. Therefore we better 3470 * be creating a new filesystem (either from a full backup, or 3471 * a clone). It would therefore be invalid if the user 3472 * specified only the pool name (i.e. if the destination name 3473 * contained no slash character). 3474 */ 3475 if (!stream_wantsnewfs || 3476 (cp = strrchr(zc.zc_name, '/')) == NULL) { 3477 zcmd_free_nvlists(&zc); 3478 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 3479 "destination '%s' does not exist"), zc.zc_name); 3480 return (zfs_error(hdl, EZFS_NOENT, errbuf)); 3481 } 3482 3483 /* 3484 * Trim off the final dataset component so we perform the 3485 * recvbackup ioctl to the filesystems's parent. 3486 */ 3487 *cp = '\0'; 3488 3489 if (flags->isprefix && !flags->istail && !flags->dryrun && 3490 create_parents(hdl, zc.zc_value, strlen(tosnap)) != 0) { 3491 zcmd_free_nvlists(&zc); 3492 return (zfs_error(hdl, EZFS_BADRESTORE, errbuf)); 3493 } 3494 3495 /* validate parent */ 3496 zhp = zfs_open(hdl, zc.zc_name, ZFS_TYPE_DATASET); 3497 if (zhp == NULL) { 3498 zcmd_free_nvlists(&zc); 3499 return (zfs_error(hdl, EZFS_BADRESTORE, errbuf)); 3500 } 3501 if (zfs_get_type(zhp) != ZFS_TYPE_FILESYSTEM) { 3502 zcmd_free_nvlists(&zc); 3503 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 3504 "parent '%s' is not a filesystem"), zc.zc_name); 3505 zfs_close(zhp); 3506 return (zfs_error(hdl, EZFS_WRONG_PARENT, errbuf)); 3507 } 3508 zfs_close(zhp); 3509 3510 newfs = B_TRUE; 3511 } 3512 3513 zc.zc_begin_record = *drr_noswap; 3514 zc.zc_cookie = infd; 3515 zc.zc_guid = flags->force; 3516 zc.zc_resumable = flags->resumable; 3517 if (flags->verbose) { 3518 (void) printf("%s %s stream of %s into %s\n", 3519 flags->dryrun ? "would receive" : "receiving", 3520 drrb->drr_fromguid ? "incremental" : "full", 3521 drrb->drr_toname, zc.zc_value); 3522 (void) fflush(stdout); 3523 } 3524 3525 if (flags->dryrun) { 3526 zcmd_free_nvlists(&zc); 3527 return (recv_skip(hdl, infd, flags->byteswap)); 3528 } 3529 3530 zc.zc_nvlist_dst = (uint64_t)(uintptr_t)prop_errbuf; 3531 zc.zc_nvlist_dst_size = sizeof (prop_errbuf); 3532 zc.zc_cleanup_fd = cleanup_fd; 3533 zc.zc_action_handle = *action_handlep; 3534 3535 err = ioctl_err = zfs_ioctl(hdl, ZFS_IOC_RECV, &zc); 3536 ioctl_errno = errno; 3537 prop_errflags = (zprop_errflags_t)zc.zc_obj; 3538 3539 if (err == 0) { 3540 nvlist_t *prop_errors; 3541 VERIFY(0 == nvlist_unpack((void *)(uintptr_t)zc.zc_nvlist_dst, 3542 zc.zc_nvlist_dst_size, &prop_errors, 0)); 3543 3544 nvpair_t *prop_err = NULL; 3545 3546 while ((prop_err = nvlist_next_nvpair(prop_errors, 3547 prop_err)) != NULL) { 3548 char tbuf[1024]; 3549 zfs_prop_t prop; 3550 int intval; 3551 3552 prop = zfs_name_to_prop(nvpair_name(prop_err)); 3553 (void) nvpair_value_int32(prop_err, &intval); 3554 if (strcmp(nvpair_name(prop_err), 3555 ZPROP_N_MORE_ERRORS) == 0) { 3556 trunc_prop_errs(intval); 3557 break; 3558 } else if (snapname == NULL || finalsnap == NULL || 3559 strcmp(finalsnap, snapname) == 0 || 3560 strcmp(nvpair_name(prop_err), 3561 zfs_prop_to_name(ZFS_PROP_REFQUOTA)) != 0) { 3562 /* 3563 * Skip the special case of, for example, 3564 * "refquota", errors on intermediate 3565 * snapshots leading up to a final one. 3566 * That's why we have all of the checks above. 3567 * 3568 * See zfs_ioctl.c's extract_delay_props() for 3569 * a list of props which can fail on 3570 * intermediate snapshots, but shouldn't 3571 * affect the overall receive. 3572 */ 3573 (void) snprintf(tbuf, sizeof (tbuf), 3574 dgettext(TEXT_DOMAIN, 3575 "cannot receive %s property on %s"), 3576 nvpair_name(prop_err), zc.zc_name); 3577 zfs_setprop_error(hdl, prop, intval, tbuf); 3578 } 3579 } 3580 nvlist_free(prop_errors); 3581 } 3582 3583 zc.zc_nvlist_dst = 0; 3584 zc.zc_nvlist_dst_size = 0; 3585 zcmd_free_nvlists(&zc); 3586 3587 if (err == 0 && snapprops_nvlist) { 3588 zfs_cmd_t zc2 = { 0 }; 3589 3590 (void) strcpy(zc2.zc_name, zc.zc_value); 3591 zc2.zc_cookie = B_TRUE; /* received */ 3592 if (zcmd_write_src_nvlist(hdl, &zc2, snapprops_nvlist) == 0) { 3593 (void) zfs_ioctl(hdl, ZFS_IOC_SET_PROP, &zc2); 3594 zcmd_free_nvlists(&zc2); 3595 } 3596 } 3597 3598 if (err && (ioctl_errno == ENOENT || ioctl_errno == EEXIST)) { 3599 /* 3600 * It may be that this snapshot already exists, 3601 * in which case we want to consume & ignore it 3602 * rather than failing. 3603 */ 3604 avl_tree_t *local_avl; 3605 nvlist_t *local_nv, *fs; 3606 cp = strchr(zc.zc_value, '@'); 3607 3608 /* 3609 * XXX Do this faster by just iterating over snaps in 3610 * this fs. Also if zc_value does not exist, we will 3611 * get a strange "does not exist" error message. 3612 */ 3613 *cp = '\0'; 3614 if (gather_nvlist(hdl, zc.zc_value, NULL, NULL, B_FALSE, 3615 B_FALSE, B_FALSE, &local_nv, &local_avl) == 0) { 3616 *cp = '@'; 3617 fs = fsavl_find(local_avl, drrb->drr_toguid, NULL); 3618 fsavl_destroy(local_avl); 3619 nvlist_free(local_nv); 3620 3621 if (fs != NULL) { 3622 if (flags->verbose) { 3623 (void) printf("snap %s already exists; " 3624 "ignoring\n", zc.zc_value); 3625 } 3626 err = ioctl_err = recv_skip(hdl, infd, 3627 flags->byteswap); 3628 } 3629 } 3630 *cp = '@'; 3631 } 3632 3633 if (ioctl_err != 0) { 3634 switch (ioctl_errno) { 3635 case ENODEV: 3636 cp = strchr(zc.zc_value, '@'); 3637 *cp = '\0'; 3638 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 3639 "most recent snapshot of %s does not\n" 3640 "match incremental source"), zc.zc_value); 3641 (void) zfs_error(hdl, EZFS_BADRESTORE, errbuf); 3642 *cp = '@'; 3643 break; 3644 case ETXTBSY: 3645 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 3646 "destination %s has been modified\n" 3647 "since most recent snapshot"), zc.zc_name); 3648 (void) zfs_error(hdl, EZFS_BADRESTORE, errbuf); 3649 break; 3650 case EEXIST: 3651 cp = strchr(zc.zc_value, '@'); 3652 if (newfs) { 3653 /* it's the containing fs that exists */ 3654 *cp = '\0'; 3655 } 3656 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 3657 "destination already exists")); 3658 (void) zfs_error_fmt(hdl, EZFS_EXISTS, 3659 dgettext(TEXT_DOMAIN, "cannot restore to %s"), 3660 zc.zc_value); 3661 *cp = '@'; 3662 break; 3663 case EINVAL: 3664 (void) zfs_error(hdl, EZFS_BADSTREAM, errbuf); 3665 break; 3666 case ECKSUM: 3667 recv_ecksum_set_aux(hdl, zc.zc_value, flags->resumable); 3668 (void) zfs_error(hdl, EZFS_BADSTREAM, errbuf); 3669 break; 3670 case ENOTSUP: 3671 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 3672 "pool must be upgraded to receive this stream.")); 3673 (void) zfs_error(hdl, EZFS_BADVERSION, errbuf); 3674 break; 3675 case EDQUOT: 3676 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 3677 "destination %s space quota exceeded"), zc.zc_name); 3678 (void) zfs_error(hdl, EZFS_NOSPC, errbuf); 3679 break; 3680 default: 3681 (void) zfs_standard_error(hdl, ioctl_errno, errbuf); 3682 } 3683 } 3684 3685 /* 3686 * Mount the target filesystem (if created). Also mount any 3687 * children of the target filesystem if we did a replication 3688 * receive (indicated by stream_avl being non-NULL). 3689 */ 3690 cp = strchr(zc.zc_value, '@'); 3691 if (cp && (ioctl_err == 0 || !newfs)) { 3692 zfs_handle_t *h; 3693 3694 *cp = '\0'; 3695 h = zfs_open(hdl, zc.zc_value, 3696 ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME); 3697 if (h != NULL) { 3698 if (h->zfs_type == ZFS_TYPE_VOLUME) { 3699 *cp = '@'; 3700 } else if (newfs || stream_avl) { 3701 /* 3702 * Track the first/top of hierarchy fs, 3703 * for mounting and sharing later. 3704 */ 3705 if (top_zfs && *top_zfs == NULL) 3706 *top_zfs = zfs_strdup(hdl, zc.zc_value); 3707 } 3708 zfs_close(h); 3709 } 3710 *cp = '@'; 3711 } 3712 3713 if (clp) { 3714 if (!flags->nomount) 3715 err |= changelist_postfix(clp); 3716 changelist_free(clp); 3717 } 3718 3719 if (prop_errflags & ZPROP_ERR_NOCLEAR) { 3720 (void) fprintf(stderr, dgettext(TEXT_DOMAIN, "Warning: " 3721 "failed to clear unreceived properties on %s"), 3722 zc.zc_name); 3723 (void) fprintf(stderr, "\n"); 3724 } 3725 if (prop_errflags & ZPROP_ERR_NORESTORE) { 3726 (void) fprintf(stderr, dgettext(TEXT_DOMAIN, "Warning: " 3727 "failed to restore original properties on %s"), 3728 zc.zc_name); 3729 (void) fprintf(stderr, "\n"); 3730 } 3731 3732 if (err || ioctl_err) 3733 return (-1); 3734 3735 *action_handlep = zc.zc_action_handle; 3736 3737 if (flags->verbose) { 3738 char buf1[64]; 3739 char buf2[64]; 3740 uint64_t bytes = zc.zc_cookie; 3741 time_t delta = time(NULL) - begin_time; 3742 if (delta == 0) 3743 delta = 1; 3744 zfs_nicenum(bytes, buf1, sizeof (buf1)); 3745 zfs_nicenum(bytes/delta, buf2, sizeof (buf1)); 3746 3747 (void) printf("received %sB stream in %lu seconds (%sB/sec)\n", 3748 buf1, delta, buf2); 3749 } 3750 3751 return (0); 3752} 3753 3754static int 3755zfs_receive_impl(libzfs_handle_t *hdl, const char *tosnap, 3756 const char *originsnap, recvflags_t *flags, int infd, const char *sendfs, 3757 nvlist_t *stream_nv, avl_tree_t *stream_avl, char **top_zfs, int cleanup_fd, 3758 uint64_t *action_handlep, const char *finalsnap) 3759{ 3760 int err; 3761 dmu_replay_record_t drr, drr_noswap; 3762 struct drr_begin *drrb = &drr.drr_u.drr_begin; 3763 char errbuf[1024]; 3764 zio_cksum_t zcksum = { 0 }; 3765 uint64_t featureflags; 3766 int hdrtype; 3767 3768 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN, 3769 "cannot receive")); 3770 3771 if (flags->isprefix && 3772 !zfs_dataset_exists(hdl, tosnap, ZFS_TYPE_DATASET)) { 3773 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "specified fs " 3774 "(%s) does not exist"), tosnap); 3775 return (zfs_error(hdl, EZFS_NOENT, errbuf)); 3776 } 3777 if (originsnap && 3778 !zfs_dataset_exists(hdl, originsnap, ZFS_TYPE_DATASET)) { 3779 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "specified origin fs " 3780 "(%s) does not exist"), originsnap); 3781 return (zfs_error(hdl, EZFS_NOENT, errbuf)); 3782 } 3783 3784 /* read in the BEGIN record */ 3785 if (0 != (err = recv_read(hdl, infd, &drr, sizeof (drr), B_FALSE, 3786 &zcksum))) 3787 return (err); 3788 3789 if (drr.drr_type == DRR_END || drr.drr_type == BSWAP_32(DRR_END)) { 3790 /* It's the double end record at the end of a package */ 3791 return (ENODATA); 3792 } 3793 3794 /* the kernel needs the non-byteswapped begin record */ 3795 drr_noswap = drr; 3796 3797 flags->byteswap = B_FALSE; 3798 if (drrb->drr_magic == BSWAP_64(DMU_BACKUP_MAGIC)) { 3799 /* 3800 * We computed the checksum in the wrong byteorder in 3801 * recv_read() above; do it again correctly. 3802 */ 3803 bzero(&zcksum, sizeof (zio_cksum_t)); 3804 (void) fletcher_4_incremental_byteswap(&drr, 3805 sizeof (drr), &zcksum); 3806 flags->byteswap = B_TRUE; 3807 3808 drr.drr_type = BSWAP_32(drr.drr_type); 3809 drr.drr_payloadlen = BSWAP_32(drr.drr_payloadlen); 3810 drrb->drr_magic = BSWAP_64(drrb->drr_magic); 3811 drrb->drr_versioninfo = BSWAP_64(drrb->drr_versioninfo); 3812 drrb->drr_creation_time = BSWAP_64(drrb->drr_creation_time); 3813 drrb->drr_type = BSWAP_32(drrb->drr_type); 3814 drrb->drr_flags = BSWAP_32(drrb->drr_flags); 3815 drrb->drr_toguid = BSWAP_64(drrb->drr_toguid); 3816 drrb->drr_fromguid = BSWAP_64(drrb->drr_fromguid); 3817 } 3818 3819 if (drrb->drr_magic != DMU_BACKUP_MAGIC || drr.drr_type != DRR_BEGIN) { 3820 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "invalid " 3821 "stream (bad magic number)")); 3822 return (zfs_error(hdl, EZFS_BADSTREAM, errbuf)); 3823 } 3824 3825 featureflags = DMU_GET_FEATUREFLAGS(drrb->drr_versioninfo); 3826 hdrtype = DMU_GET_STREAM_HDRTYPE(drrb->drr_versioninfo); 3827 3828 if (!DMU_STREAM_SUPPORTED(featureflags) || 3829 (hdrtype != DMU_SUBSTREAM && hdrtype != DMU_COMPOUNDSTREAM)) { 3830 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 3831 "stream has unsupported feature, feature flags = %lx"), 3832 featureflags); 3833 return (zfs_error(hdl, EZFS_BADSTREAM, errbuf)); 3834 } 3835 3836 if (strchr(drrb->drr_toname, '@') == NULL) { 3837 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "invalid " 3838 "stream (bad snapshot name)")); 3839 return (zfs_error(hdl, EZFS_BADSTREAM, errbuf)); 3840 } 3841 3842 if (DMU_GET_STREAM_HDRTYPE(drrb->drr_versioninfo) == DMU_SUBSTREAM) { 3843 char nonpackage_sendfs[ZFS_MAX_DATASET_NAME_LEN]; 3844 if (sendfs == NULL) { 3845 /* 3846 * We were not called from zfs_receive_package(). Get 3847 * the fs specified by 'zfs send'. 3848 */ 3849 char *cp; 3850 (void) strlcpy(nonpackage_sendfs, 3851 drr.drr_u.drr_begin.drr_toname, 3852 sizeof (nonpackage_sendfs)); 3853 if ((cp = strchr(nonpackage_sendfs, '@')) != NULL) 3854 *cp = '\0'; 3855 sendfs = nonpackage_sendfs; 3856 VERIFY(finalsnap == NULL); 3857 } 3858 return (zfs_receive_one(hdl, infd, tosnap, originsnap, flags, 3859 &drr, &drr_noswap, sendfs, stream_nv, stream_avl, top_zfs, 3860 cleanup_fd, action_handlep, finalsnap)); 3861 } else { 3862 assert(DMU_GET_STREAM_HDRTYPE(drrb->drr_versioninfo) == 3863 DMU_COMPOUNDSTREAM); 3864 return (zfs_receive_package(hdl, infd, tosnap, flags, &drr, 3865 &zcksum, top_zfs, cleanup_fd, action_handlep)); 3866 } 3867} 3868 3869/* 3870 * Restores a backup of tosnap from the file descriptor specified by infd. 3871 * Return 0 on total success, -2 if some things couldn't be 3872 * destroyed/renamed/promoted, -1 if some things couldn't be received. 3873 * (-1 will override -2, if -1 and the resumable flag was specified the 3874 * transfer can be resumed if the sending side supports it). 3875 */ 3876int 3877zfs_receive(libzfs_handle_t *hdl, const char *tosnap, nvlist_t *props, 3878 recvflags_t *flags, int infd, avl_tree_t *stream_avl) 3879{ 3880 char *top_zfs = NULL; 3881 int err; 3882 int cleanup_fd; 3883 uint64_t action_handle = 0; 3884 char *originsnap = NULL; 3885 if (props) { 3886 err = nvlist_lookup_string(props, "origin", &originsnap); 3887 if (err && err != ENOENT) 3888 return (err); 3889 } 3890 3891 cleanup_fd = open(ZFS_DEV, O_RDWR|O_EXCL); 3892 VERIFY(cleanup_fd >= 0); 3893 3894 err = zfs_receive_impl(hdl, tosnap, originsnap, flags, infd, NULL, NULL, 3895 stream_avl, &top_zfs, cleanup_fd, &action_handle, NULL); 3896 3897 VERIFY(0 == close(cleanup_fd)); 3898 3899 if (err == 0 && !flags->nomount && top_zfs) { 3900 zfs_handle_t *zhp; 3901 prop_changelist_t *clp; 3902 3903 zhp = zfs_open(hdl, top_zfs, ZFS_TYPE_FILESYSTEM); 3904 if (zhp != NULL) { 3905 clp = changelist_gather(zhp, ZFS_PROP_MOUNTPOINT, 3906 CL_GATHER_MOUNT_ALWAYS, 0); 3907 zfs_close(zhp); 3908 if (clp != NULL) { 3909 /* mount and share received datasets */ 3910 err = changelist_postfix(clp); 3911 changelist_free(clp); 3912 } 3913 } 3914 if (zhp == NULL || clp == NULL || err) 3915 err = -1; 3916 } 3917 if (top_zfs) 3918 free(top_zfs); 3919 3920 return (err); 3921} 3922