libzfs_sendrecv.c revision 268649
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, 2014 by Delphix. All rights reserved. 25 * Copyright (c) 2012, Joyent, Inc. All rights reserved. 26 * Copyright (c) 2012 Pawel Jakub Dawidek <pawel@dawidek.net>. 27 * All rights reserved. 28 * Copyright (c) 2013 Steven Hartland. All rights reserved. 29 */ 30 31#include <assert.h> 32#include <ctype.h> 33#include <errno.h> 34#include <libintl.h> 35#include <stdio.h> 36#include <stdlib.h> 37#include <strings.h> 38#include <unistd.h> 39#include <stddef.h> 40#include <fcntl.h> 41#include <sys/param.h> 42#include <sys/mount.h> 43#include <pthread.h> 44#include <umem.h> 45#include <time.h> 46 47#include <libzfs.h> 48#include <libzfs_core.h> 49 50#include "zfs_namecheck.h" 51#include "zfs_prop.h" 52#include "zfs_fletcher.h" 53#include "libzfs_impl.h" 54#include <sha2.h> 55#include <sys/zio_checksum.h> 56#include <sys/ddt.h> 57 58#ifdef __FreeBSD__ 59extern int zfs_ioctl_version; 60#endif 61 62/* in libzfs_dataset.c */ 63extern void zfs_setprop_error(libzfs_handle_t *, zfs_prop_t, int, char *); 64/* We need to use something for ENODATA. */ 65#define ENODATA EIDRM 66 67static int zfs_receive_impl(libzfs_handle_t *, const char *, recvflags_t *, 68 int, const char *, nvlist_t *, avl_tree_t *, char **, int, uint64_t *); 69 70static const zio_cksum_t zero_cksum = { 0 }; 71 72typedef struct dedup_arg { 73 int inputfd; 74 int outputfd; 75 libzfs_handle_t *dedup_hdl; 76} dedup_arg_t; 77 78typedef struct progress_arg { 79 zfs_handle_t *pa_zhp; 80 int pa_fd; 81 boolean_t pa_parsable; 82} progress_arg_t; 83 84typedef struct dataref { 85 uint64_t ref_guid; 86 uint64_t ref_object; 87 uint64_t ref_offset; 88} dataref_t; 89 90typedef struct dedup_entry { 91 struct dedup_entry *dde_next; 92 zio_cksum_t dde_chksum; 93 uint64_t dde_prop; 94 dataref_t dde_ref; 95} dedup_entry_t; 96 97#define MAX_DDT_PHYSMEM_PERCENT 20 98#define SMALLEST_POSSIBLE_MAX_DDT_MB 128 99 100typedef struct dedup_table { 101 dedup_entry_t **dedup_hash_array; 102 umem_cache_t *ddecache; 103 uint64_t max_ddt_size; /* max dedup table size in bytes */ 104 uint64_t cur_ddt_size; /* current dedup table size in bytes */ 105 uint64_t ddt_count; 106 int numhashbits; 107 boolean_t ddt_full; 108} dedup_table_t; 109 110static int 111high_order_bit(uint64_t n) 112{ 113 int count; 114 115 for (count = 0; n != 0; count++) 116 n >>= 1; 117 return (count); 118} 119 120static size_t 121ssread(void *buf, size_t len, FILE *stream) 122{ 123 size_t outlen; 124 125 if ((outlen = fread(buf, len, 1, stream)) == 0) 126 return (0); 127 128 return (outlen); 129} 130 131static void 132ddt_hash_append(libzfs_handle_t *hdl, dedup_table_t *ddt, dedup_entry_t **ddepp, 133 zio_cksum_t *cs, uint64_t prop, dataref_t *dr) 134{ 135 dedup_entry_t *dde; 136 137 if (ddt->cur_ddt_size >= ddt->max_ddt_size) { 138 if (ddt->ddt_full == B_FALSE) { 139 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 140 "Dedup table full. Deduplication will continue " 141 "with existing table entries")); 142 ddt->ddt_full = B_TRUE; 143 } 144 return; 145 } 146 147 if ((dde = umem_cache_alloc(ddt->ddecache, UMEM_DEFAULT)) 148 != NULL) { 149 assert(*ddepp == NULL); 150 dde->dde_next = NULL; 151 dde->dde_chksum = *cs; 152 dde->dde_prop = prop; 153 dde->dde_ref = *dr; 154 *ddepp = dde; 155 ddt->cur_ddt_size += sizeof (dedup_entry_t); 156 ddt->ddt_count++; 157 } 158} 159 160/* 161 * Using the specified dedup table, do a lookup for an entry with 162 * the checksum cs. If found, return the block's reference info 163 * in *dr. Otherwise, insert a new entry in the dedup table, using 164 * the reference information specified by *dr. 165 * 166 * return value: true - entry was found 167 * false - entry was not found 168 */ 169static boolean_t 170ddt_update(libzfs_handle_t *hdl, dedup_table_t *ddt, zio_cksum_t *cs, 171 uint64_t prop, dataref_t *dr) 172{ 173 uint32_t hashcode; 174 dedup_entry_t **ddepp; 175 176 hashcode = BF64_GET(cs->zc_word[0], 0, ddt->numhashbits); 177 178 for (ddepp = &(ddt->dedup_hash_array[hashcode]); *ddepp != NULL; 179 ddepp = &((*ddepp)->dde_next)) { 180 if (ZIO_CHECKSUM_EQUAL(((*ddepp)->dde_chksum), *cs) && 181 (*ddepp)->dde_prop == prop) { 182 *dr = (*ddepp)->dde_ref; 183 return (B_TRUE); 184 } 185 } 186 ddt_hash_append(hdl, ddt, ddepp, cs, prop, dr); 187 return (B_FALSE); 188} 189 190static int 191cksum_and_write(const void *buf, uint64_t len, zio_cksum_t *zc, int outfd) 192{ 193 fletcher_4_incremental_native(buf, len, zc); 194 return (write(outfd, buf, len)); 195} 196 197/* 198 * This function is started in a separate thread when the dedup option 199 * has been requested. The main send thread determines the list of 200 * snapshots to be included in the send stream and makes the ioctl calls 201 * for each one. But instead of having the ioctl send the output to the 202 * the output fd specified by the caller of zfs_send()), the 203 * ioctl is told to direct the output to a pipe, which is read by the 204 * alternate thread running THIS function. This function does the 205 * dedup'ing by: 206 * 1. building a dedup table (the DDT) 207 * 2. doing checksums on each data block and inserting a record in the DDT 208 * 3. looking for matching checksums, and 209 * 4. sending a DRR_WRITE_BYREF record instead of a write record whenever 210 * a duplicate block is found. 211 * The output of this function then goes to the output fd requested 212 * by the caller of zfs_send(). 213 */ 214static void * 215cksummer(void *arg) 216{ 217 dedup_arg_t *dda = arg; 218 char *buf = malloc(1<<20); 219 dmu_replay_record_t thedrr; 220 dmu_replay_record_t *drr = &thedrr; 221 struct drr_begin *drrb = &thedrr.drr_u.drr_begin; 222 struct drr_end *drre = &thedrr.drr_u.drr_end; 223 struct drr_object *drro = &thedrr.drr_u.drr_object; 224 struct drr_write *drrw = &thedrr.drr_u.drr_write; 225 struct drr_spill *drrs = &thedrr.drr_u.drr_spill; 226 struct drr_write_embedded *drrwe = &thedrr.drr_u.drr_write_embedded; 227 FILE *ofp; 228 int outfd; 229 dmu_replay_record_t wbr_drr = {0}; 230 struct drr_write_byref *wbr_drrr = &wbr_drr.drr_u.drr_write_byref; 231 dedup_table_t ddt; 232 zio_cksum_t stream_cksum; 233 uint64_t physmem = sysconf(_SC_PHYS_PAGES) * sysconf(_SC_PAGESIZE); 234 uint64_t numbuckets; 235 236 ddt.max_ddt_size = 237 MAX((physmem * MAX_DDT_PHYSMEM_PERCENT)/100, 238 SMALLEST_POSSIBLE_MAX_DDT_MB<<20); 239 240 numbuckets = ddt.max_ddt_size/(sizeof (dedup_entry_t)); 241 242 /* 243 * numbuckets must be a power of 2. Increase number to 244 * a power of 2 if necessary. 245 */ 246 if (!ISP2(numbuckets)) 247 numbuckets = 1 << high_order_bit(numbuckets); 248 249 ddt.dedup_hash_array = calloc(numbuckets, sizeof (dedup_entry_t *)); 250 ddt.ddecache = umem_cache_create("dde", sizeof (dedup_entry_t), 0, 251 NULL, NULL, NULL, NULL, NULL, 0); 252 ddt.cur_ddt_size = numbuckets * sizeof (dedup_entry_t *); 253 ddt.numhashbits = high_order_bit(numbuckets) - 1; 254 ddt.ddt_full = B_FALSE; 255 256 /* Initialize the write-by-reference block. */ 257 wbr_drr.drr_type = DRR_WRITE_BYREF; 258 wbr_drr.drr_payloadlen = 0; 259 260 outfd = dda->outputfd; 261 ofp = fdopen(dda->inputfd, "r"); 262 while (ssread(drr, sizeof (dmu_replay_record_t), ofp) != 0) { 263 264 switch (drr->drr_type) { 265 case DRR_BEGIN: 266 { 267 int fflags; 268 ZIO_SET_CHECKSUM(&stream_cksum, 0, 0, 0, 0); 269 270 /* set the DEDUP feature flag for this stream */ 271 fflags = DMU_GET_FEATUREFLAGS(drrb->drr_versioninfo); 272 fflags |= (DMU_BACKUP_FEATURE_DEDUP | 273 DMU_BACKUP_FEATURE_DEDUPPROPS); 274 DMU_SET_FEATUREFLAGS(drrb->drr_versioninfo, fflags); 275 276 if (cksum_and_write(drr, sizeof (dmu_replay_record_t), 277 &stream_cksum, outfd) == -1) 278 goto out; 279 if (DMU_GET_STREAM_HDRTYPE(drrb->drr_versioninfo) == 280 DMU_COMPOUNDSTREAM && drr->drr_payloadlen != 0) { 281 int sz = drr->drr_payloadlen; 282 283 if (sz > 1<<20) { 284 free(buf); 285 buf = malloc(sz); 286 } 287 (void) ssread(buf, sz, ofp); 288 if (ferror(stdin)) 289 perror("fread"); 290 if (cksum_and_write(buf, sz, &stream_cksum, 291 outfd) == -1) 292 goto out; 293 } 294 break; 295 } 296 297 case DRR_END: 298 { 299 /* use the recalculated checksum */ 300 ZIO_SET_CHECKSUM(&drre->drr_checksum, 301 stream_cksum.zc_word[0], stream_cksum.zc_word[1], 302 stream_cksum.zc_word[2], stream_cksum.zc_word[3]); 303 if ((write(outfd, drr, 304 sizeof (dmu_replay_record_t))) == -1) 305 goto out; 306 break; 307 } 308 309 case DRR_OBJECT: 310 { 311 if (cksum_and_write(drr, sizeof (dmu_replay_record_t), 312 &stream_cksum, outfd) == -1) 313 goto out; 314 if (drro->drr_bonuslen > 0) { 315 (void) ssread(buf, 316 P2ROUNDUP((uint64_t)drro->drr_bonuslen, 8), 317 ofp); 318 if (cksum_and_write(buf, 319 P2ROUNDUP((uint64_t)drro->drr_bonuslen, 8), 320 &stream_cksum, outfd) == -1) 321 goto out; 322 } 323 break; 324 } 325 326 case DRR_SPILL: 327 { 328 if (cksum_and_write(drr, sizeof (dmu_replay_record_t), 329 &stream_cksum, outfd) == -1) 330 goto out; 331 (void) ssread(buf, drrs->drr_length, ofp); 332 if (cksum_and_write(buf, drrs->drr_length, 333 &stream_cksum, outfd) == -1) 334 goto out; 335 break; 336 } 337 338 case DRR_FREEOBJECTS: 339 { 340 if (cksum_and_write(drr, sizeof (dmu_replay_record_t), 341 &stream_cksum, outfd) == -1) 342 goto out; 343 break; 344 } 345 346 case DRR_WRITE: 347 { 348 dataref_t dataref; 349 350 (void) ssread(buf, drrw->drr_length, ofp); 351 352 /* 353 * Use the existing checksum if it's dedup-capable, 354 * else calculate a SHA256 checksum for it. 355 */ 356 357 if (ZIO_CHECKSUM_EQUAL(drrw->drr_key.ddk_cksum, 358 zero_cksum) || 359 !DRR_IS_DEDUP_CAPABLE(drrw->drr_checksumflags)) { 360 SHA256_CTX ctx; 361 zio_cksum_t tmpsha256; 362 363 SHA256Init(&ctx); 364 SHA256Update(&ctx, buf, drrw->drr_length); 365 SHA256Final(&tmpsha256, &ctx); 366 drrw->drr_key.ddk_cksum.zc_word[0] = 367 BE_64(tmpsha256.zc_word[0]); 368 drrw->drr_key.ddk_cksum.zc_word[1] = 369 BE_64(tmpsha256.zc_word[1]); 370 drrw->drr_key.ddk_cksum.zc_word[2] = 371 BE_64(tmpsha256.zc_word[2]); 372 drrw->drr_key.ddk_cksum.zc_word[3] = 373 BE_64(tmpsha256.zc_word[3]); 374 drrw->drr_checksumtype = ZIO_CHECKSUM_SHA256; 375 drrw->drr_checksumflags = DRR_CHECKSUM_DEDUP; 376 } 377 378 dataref.ref_guid = drrw->drr_toguid; 379 dataref.ref_object = drrw->drr_object; 380 dataref.ref_offset = drrw->drr_offset; 381 382 if (ddt_update(dda->dedup_hdl, &ddt, 383 &drrw->drr_key.ddk_cksum, drrw->drr_key.ddk_prop, 384 &dataref)) { 385 /* block already present in stream */ 386 wbr_drrr->drr_object = drrw->drr_object; 387 wbr_drrr->drr_offset = drrw->drr_offset; 388 wbr_drrr->drr_length = drrw->drr_length; 389 wbr_drrr->drr_toguid = drrw->drr_toguid; 390 wbr_drrr->drr_refguid = dataref.ref_guid; 391 wbr_drrr->drr_refobject = 392 dataref.ref_object; 393 wbr_drrr->drr_refoffset = 394 dataref.ref_offset; 395 396 wbr_drrr->drr_checksumtype = 397 drrw->drr_checksumtype; 398 wbr_drrr->drr_checksumflags = 399 drrw->drr_checksumtype; 400 wbr_drrr->drr_key.ddk_cksum = 401 drrw->drr_key.ddk_cksum; 402 wbr_drrr->drr_key.ddk_prop = 403 drrw->drr_key.ddk_prop; 404 405 if (cksum_and_write(&wbr_drr, 406 sizeof (dmu_replay_record_t), &stream_cksum, 407 outfd) == -1) 408 goto out; 409 } else { 410 /* block not previously seen */ 411 if (cksum_and_write(drr, 412 sizeof (dmu_replay_record_t), &stream_cksum, 413 outfd) == -1) 414 goto out; 415 if (cksum_and_write(buf, 416 drrw->drr_length, 417 &stream_cksum, outfd) == -1) 418 goto out; 419 } 420 break; 421 } 422 423 case DRR_WRITE_EMBEDDED: 424 { 425 if (cksum_and_write(drr, sizeof (dmu_replay_record_t), 426 &stream_cksum, outfd) == -1) 427 goto out; 428 (void) ssread(buf, 429 P2ROUNDUP((uint64_t)drrwe->drr_psize, 8), ofp); 430 if (cksum_and_write(buf, 431 P2ROUNDUP((uint64_t)drrwe->drr_psize, 8), 432 &stream_cksum, outfd) == -1) 433 goto out; 434 break; 435 } 436 437 case DRR_FREE: 438 { 439 if (cksum_and_write(drr, sizeof (dmu_replay_record_t), 440 &stream_cksum, outfd) == -1) 441 goto out; 442 break; 443 } 444 445 default: 446 (void) printf("INVALID record type 0x%x\n", 447 drr->drr_type); 448 /* should never happen, so assert */ 449 assert(B_FALSE); 450 } 451 } 452out: 453 umem_cache_destroy(ddt.ddecache); 454 free(ddt.dedup_hash_array); 455 free(buf); 456 (void) fclose(ofp); 457 458 return (NULL); 459} 460 461/* 462 * Routines for dealing with the AVL tree of fs-nvlists 463 */ 464typedef struct fsavl_node { 465 avl_node_t fn_node; 466 nvlist_t *fn_nvfs; 467 char *fn_snapname; 468 uint64_t fn_guid; 469} fsavl_node_t; 470 471static int 472fsavl_compare(const void *arg1, const void *arg2) 473{ 474 const fsavl_node_t *fn1 = arg1; 475 const fsavl_node_t *fn2 = arg2; 476 477 if (fn1->fn_guid > fn2->fn_guid) 478 return (+1); 479 else if (fn1->fn_guid < fn2->fn_guid) 480 return (-1); 481 else 482 return (0); 483} 484 485/* 486 * Given the GUID of a snapshot, find its containing filesystem and 487 * (optionally) name. 488 */ 489static nvlist_t * 490fsavl_find(avl_tree_t *avl, uint64_t snapguid, char **snapname) 491{ 492 fsavl_node_t fn_find; 493 fsavl_node_t *fn; 494 495 fn_find.fn_guid = snapguid; 496 497 fn = avl_find(avl, &fn_find, NULL); 498 if (fn) { 499 if (snapname) 500 *snapname = fn->fn_snapname; 501 return (fn->fn_nvfs); 502 } 503 return (NULL); 504} 505 506static void 507fsavl_destroy(avl_tree_t *avl) 508{ 509 fsavl_node_t *fn; 510 void *cookie; 511 512 if (avl == NULL) 513 return; 514 515 cookie = NULL; 516 while ((fn = avl_destroy_nodes(avl, &cookie)) != NULL) 517 free(fn); 518 avl_destroy(avl); 519 free(avl); 520} 521 522/* 523 * Given an nvlist, produce an avl tree of snapshots, ordered by guid 524 */ 525static avl_tree_t * 526fsavl_create(nvlist_t *fss) 527{ 528 avl_tree_t *fsavl; 529 nvpair_t *fselem = NULL; 530 531 if ((fsavl = malloc(sizeof (avl_tree_t))) == NULL) 532 return (NULL); 533 534 avl_create(fsavl, fsavl_compare, sizeof (fsavl_node_t), 535 offsetof(fsavl_node_t, fn_node)); 536 537 while ((fselem = nvlist_next_nvpair(fss, fselem)) != NULL) { 538 nvlist_t *nvfs, *snaps; 539 nvpair_t *snapelem = NULL; 540 541 VERIFY(0 == nvpair_value_nvlist(fselem, &nvfs)); 542 VERIFY(0 == nvlist_lookup_nvlist(nvfs, "snaps", &snaps)); 543 544 while ((snapelem = 545 nvlist_next_nvpair(snaps, snapelem)) != NULL) { 546 fsavl_node_t *fn; 547 uint64_t guid; 548 549 VERIFY(0 == nvpair_value_uint64(snapelem, &guid)); 550 if ((fn = malloc(sizeof (fsavl_node_t))) == NULL) { 551 fsavl_destroy(fsavl); 552 return (NULL); 553 } 554 fn->fn_nvfs = nvfs; 555 fn->fn_snapname = nvpair_name(snapelem); 556 fn->fn_guid = guid; 557 558 /* 559 * Note: if there are multiple snaps with the 560 * same GUID, we ignore all but one. 561 */ 562 if (avl_find(fsavl, fn, NULL) == NULL) 563 avl_add(fsavl, fn); 564 else 565 free(fn); 566 } 567 } 568 569 return (fsavl); 570} 571 572/* 573 * Routines for dealing with the giant nvlist of fs-nvlists, etc. 574 */ 575typedef struct send_data { 576 uint64_t parent_fromsnap_guid; 577 nvlist_t *parent_snaps; 578 nvlist_t *fss; 579 nvlist_t *snapprops; 580 const char *fromsnap; 581 const char *tosnap; 582 boolean_t recursive; 583 584 /* 585 * The header nvlist is of the following format: 586 * { 587 * "tosnap" -> string 588 * "fromsnap" -> string (if incremental) 589 * "fss" -> { 590 * id -> { 591 * 592 * "name" -> string (full name; for debugging) 593 * "parentfromsnap" -> number (guid of fromsnap in parent) 594 * 595 * "props" -> { name -> value (only if set here) } 596 * "snaps" -> { name (lastname) -> number (guid) } 597 * "snapprops" -> { name (lastname) -> { name -> value } } 598 * 599 * "origin" -> number (guid) (if clone) 600 * "sent" -> boolean (not on-disk) 601 * } 602 * } 603 * } 604 * 605 */ 606} send_data_t; 607 608static void send_iterate_prop(zfs_handle_t *zhp, nvlist_t *nv); 609 610static int 611send_iterate_snap(zfs_handle_t *zhp, void *arg) 612{ 613 send_data_t *sd = arg; 614 uint64_t guid = zhp->zfs_dmustats.dds_guid; 615 char *snapname; 616 nvlist_t *nv; 617 618 snapname = strrchr(zhp->zfs_name, '@')+1; 619 620 VERIFY(0 == nvlist_add_uint64(sd->parent_snaps, snapname, guid)); 621 /* 622 * NB: if there is no fromsnap here (it's a newly created fs in 623 * an incremental replication), we will substitute the tosnap. 624 */ 625 if ((sd->fromsnap && strcmp(snapname, sd->fromsnap) == 0) || 626 (sd->parent_fromsnap_guid == 0 && sd->tosnap && 627 strcmp(snapname, sd->tosnap) == 0)) { 628 sd->parent_fromsnap_guid = guid; 629 } 630 631 VERIFY(0 == nvlist_alloc(&nv, NV_UNIQUE_NAME, 0)); 632 send_iterate_prop(zhp, nv); 633 VERIFY(0 == nvlist_add_nvlist(sd->snapprops, snapname, nv)); 634 nvlist_free(nv); 635 636 zfs_close(zhp); 637 return (0); 638} 639 640static void 641send_iterate_prop(zfs_handle_t *zhp, nvlist_t *nv) 642{ 643 nvpair_t *elem = NULL; 644 645 while ((elem = nvlist_next_nvpair(zhp->zfs_props, elem)) != NULL) { 646 char *propname = nvpair_name(elem); 647 zfs_prop_t prop = zfs_name_to_prop(propname); 648 nvlist_t *propnv; 649 650 if (!zfs_prop_user(propname)) { 651 /* 652 * Realistically, this should never happen. However, 653 * we want the ability to add DSL properties without 654 * needing to make incompatible version changes. We 655 * need to ignore unknown properties to allow older 656 * software to still send datasets containing these 657 * properties, with the unknown properties elided. 658 */ 659 if (prop == ZPROP_INVAL) 660 continue; 661 662 if (zfs_prop_readonly(prop)) 663 continue; 664 } 665 666 verify(nvpair_value_nvlist(elem, &propnv) == 0); 667 if (prop == ZFS_PROP_QUOTA || prop == ZFS_PROP_RESERVATION || 668 prop == ZFS_PROP_REFQUOTA || 669 prop == ZFS_PROP_REFRESERVATION) { 670 char *source; 671 uint64_t value; 672 verify(nvlist_lookup_uint64(propnv, 673 ZPROP_VALUE, &value) == 0); 674 if (zhp->zfs_type == ZFS_TYPE_SNAPSHOT) 675 continue; 676 /* 677 * May have no source before SPA_VERSION_RECVD_PROPS, 678 * but is still modifiable. 679 */ 680 if (nvlist_lookup_string(propnv, 681 ZPROP_SOURCE, &source) == 0) { 682 if ((strcmp(source, zhp->zfs_name) != 0) && 683 (strcmp(source, 684 ZPROP_SOURCE_VAL_RECVD) != 0)) 685 continue; 686 } 687 } else { 688 char *source; 689 if (nvlist_lookup_string(propnv, 690 ZPROP_SOURCE, &source) != 0) 691 continue; 692 if ((strcmp(source, zhp->zfs_name) != 0) && 693 (strcmp(source, ZPROP_SOURCE_VAL_RECVD) != 0)) 694 continue; 695 } 696 697 if (zfs_prop_user(propname) || 698 zfs_prop_get_type(prop) == PROP_TYPE_STRING) { 699 char *value; 700 verify(nvlist_lookup_string(propnv, 701 ZPROP_VALUE, &value) == 0); 702 VERIFY(0 == nvlist_add_string(nv, propname, value)); 703 } else { 704 uint64_t value; 705 verify(nvlist_lookup_uint64(propnv, 706 ZPROP_VALUE, &value) == 0); 707 VERIFY(0 == nvlist_add_uint64(nv, propname, value)); 708 } 709 } 710} 711 712/* 713 * recursively generate nvlists describing datasets. See comment 714 * for the data structure send_data_t above for description of contents 715 * of the nvlist. 716 */ 717static int 718send_iterate_fs(zfs_handle_t *zhp, void *arg) 719{ 720 send_data_t *sd = arg; 721 nvlist_t *nvfs, *nv; 722 int rv = 0; 723 uint64_t parent_fromsnap_guid_save = sd->parent_fromsnap_guid; 724 uint64_t guid = zhp->zfs_dmustats.dds_guid; 725 char guidstring[64]; 726 727 VERIFY(0 == nvlist_alloc(&nvfs, NV_UNIQUE_NAME, 0)); 728 VERIFY(0 == nvlist_add_string(nvfs, "name", zhp->zfs_name)); 729 VERIFY(0 == nvlist_add_uint64(nvfs, "parentfromsnap", 730 sd->parent_fromsnap_guid)); 731 732 if (zhp->zfs_dmustats.dds_origin[0]) { 733 zfs_handle_t *origin = zfs_open(zhp->zfs_hdl, 734 zhp->zfs_dmustats.dds_origin, ZFS_TYPE_SNAPSHOT); 735 if (origin == NULL) 736 return (-1); 737 VERIFY(0 == nvlist_add_uint64(nvfs, "origin", 738 origin->zfs_dmustats.dds_guid)); 739 } 740 741 /* iterate over props */ 742 VERIFY(0 == nvlist_alloc(&nv, NV_UNIQUE_NAME, 0)); 743 send_iterate_prop(zhp, nv); 744 VERIFY(0 == nvlist_add_nvlist(nvfs, "props", nv)); 745 nvlist_free(nv); 746 747 /* iterate over snaps, and set sd->parent_fromsnap_guid */ 748 sd->parent_fromsnap_guid = 0; 749 VERIFY(0 == nvlist_alloc(&sd->parent_snaps, NV_UNIQUE_NAME, 0)); 750 VERIFY(0 == nvlist_alloc(&sd->snapprops, NV_UNIQUE_NAME, 0)); 751 (void) zfs_iter_snapshots_sorted(zhp, send_iterate_snap, sd); 752 VERIFY(0 == nvlist_add_nvlist(nvfs, "snaps", sd->parent_snaps)); 753 VERIFY(0 == nvlist_add_nvlist(nvfs, "snapprops", sd->snapprops)); 754 nvlist_free(sd->parent_snaps); 755 nvlist_free(sd->snapprops); 756 757 /* add this fs to nvlist */ 758 (void) snprintf(guidstring, sizeof (guidstring), 759 "0x%llx", (longlong_t)guid); 760 VERIFY(0 == nvlist_add_nvlist(sd->fss, guidstring, nvfs)); 761 nvlist_free(nvfs); 762 763 /* iterate over children */ 764 if (sd->recursive) 765 rv = zfs_iter_filesystems(zhp, send_iterate_fs, sd); 766 767 sd->parent_fromsnap_guid = parent_fromsnap_guid_save; 768 769 zfs_close(zhp); 770 return (rv); 771} 772 773static int 774gather_nvlist(libzfs_handle_t *hdl, const char *fsname, const char *fromsnap, 775 const char *tosnap, boolean_t recursive, nvlist_t **nvlp, avl_tree_t **avlp) 776{ 777 zfs_handle_t *zhp; 778 send_data_t sd = { 0 }; 779 int error; 780 781 zhp = zfs_open(hdl, fsname, ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME); 782 if (zhp == NULL) 783 return (EZFS_BADTYPE); 784 785 VERIFY(0 == nvlist_alloc(&sd.fss, NV_UNIQUE_NAME, 0)); 786 sd.fromsnap = fromsnap; 787 sd.tosnap = tosnap; 788 sd.recursive = recursive; 789 790 if ((error = send_iterate_fs(zhp, &sd)) != 0) { 791 nvlist_free(sd.fss); 792 if (avlp != NULL) 793 *avlp = NULL; 794 *nvlp = NULL; 795 return (error); 796 } 797 798 if (avlp != NULL && (*avlp = fsavl_create(sd.fss)) == NULL) { 799 nvlist_free(sd.fss); 800 *nvlp = NULL; 801 return (EZFS_NOMEM); 802 } 803 804 *nvlp = sd.fss; 805 return (0); 806} 807 808/* 809 * Routines specific to "zfs send" 810 */ 811typedef struct send_dump_data { 812 /* these are all just the short snapname (the part after the @) */ 813 const char *fromsnap; 814 const char *tosnap; 815 char prevsnap[ZFS_MAXNAMELEN]; 816 uint64_t prevsnap_obj; 817 boolean_t seenfrom, seento, replicate, doall, fromorigin; 818 boolean_t verbose, dryrun, parsable, progress, embed_data; 819 int outfd; 820 boolean_t err; 821 nvlist_t *fss; 822 nvlist_t *snapholds; 823 avl_tree_t *fsavl; 824 snapfilter_cb_t *filter_cb; 825 void *filter_cb_arg; 826 nvlist_t *debugnv; 827 char holdtag[ZFS_MAXNAMELEN]; 828 int cleanup_fd; 829 uint64_t size; 830} send_dump_data_t; 831 832static int 833estimate_ioctl(zfs_handle_t *zhp, uint64_t fromsnap_obj, 834 boolean_t fromorigin, uint64_t *sizep) 835{ 836 zfs_cmd_t zc = { 0 }; 837 libzfs_handle_t *hdl = zhp->zfs_hdl; 838 839 assert(zhp->zfs_type == ZFS_TYPE_SNAPSHOT); 840 assert(fromsnap_obj == 0 || !fromorigin); 841 842 (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name)); 843 zc.zc_obj = fromorigin; 844 zc.zc_sendobj = zfs_prop_get_int(zhp, ZFS_PROP_OBJSETID); 845 zc.zc_fromobj = fromsnap_obj; 846 zc.zc_guid = 1; /* estimate flag */ 847 848 if (zfs_ioctl(zhp->zfs_hdl, ZFS_IOC_SEND, &zc) != 0) { 849 char errbuf[1024]; 850 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN, 851 "warning: cannot estimate space for '%s'"), zhp->zfs_name); 852 853 switch (errno) { 854 case EXDEV: 855 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 856 "not an earlier snapshot from the same fs")); 857 return (zfs_error(hdl, EZFS_CROSSTARGET, errbuf)); 858 859 case ENOENT: 860 if (zfs_dataset_exists(hdl, zc.zc_name, 861 ZFS_TYPE_SNAPSHOT)) { 862 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 863 "incremental source (@%s) does not exist"), 864 zc.zc_value); 865 } 866 return (zfs_error(hdl, EZFS_NOENT, errbuf)); 867 868 case EDQUOT: 869 case EFBIG: 870 case EIO: 871 case ENOLINK: 872 case ENOSPC: 873 case ENXIO: 874 case EPIPE: 875 case ERANGE: 876 case EFAULT: 877 case EROFS: 878 zfs_error_aux(hdl, strerror(errno)); 879 return (zfs_error(hdl, EZFS_BADBACKUP, errbuf)); 880 881 default: 882 return (zfs_standard_error(hdl, errno, errbuf)); 883 } 884 } 885 886 *sizep = zc.zc_objset_type; 887 888 return (0); 889} 890 891/* 892 * Dumps a backup of the given snapshot (incremental from fromsnap if it's not 893 * NULL) to the file descriptor specified by outfd. 894 */ 895static int 896dump_ioctl(zfs_handle_t *zhp, const char *fromsnap, uint64_t fromsnap_obj, 897 boolean_t fromorigin, int outfd, enum lzc_send_flags flags, 898 nvlist_t *debugnv) 899{ 900 zfs_cmd_t zc = { 0 }; 901 libzfs_handle_t *hdl = zhp->zfs_hdl; 902 nvlist_t *thisdbg; 903 904 assert(zhp->zfs_type == ZFS_TYPE_SNAPSHOT); 905 assert(fromsnap_obj == 0 || !fromorigin); 906 907 (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name)); 908 zc.zc_cookie = outfd; 909 zc.zc_obj = fromorigin; 910 zc.zc_sendobj = zfs_prop_get_int(zhp, ZFS_PROP_OBJSETID); 911 zc.zc_fromobj = fromsnap_obj; 912 zc.zc_flags = flags; 913 914 VERIFY(0 == nvlist_alloc(&thisdbg, NV_UNIQUE_NAME, 0)); 915 if (fromsnap && fromsnap[0] != '\0') { 916 VERIFY(0 == nvlist_add_string(thisdbg, 917 "fromsnap", fromsnap)); 918 } 919 920 if (zfs_ioctl(zhp->zfs_hdl, ZFS_IOC_SEND, &zc) != 0) { 921 char errbuf[1024]; 922 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN, 923 "warning: cannot send '%s'"), zhp->zfs_name); 924 925 VERIFY(0 == nvlist_add_uint64(thisdbg, "error", errno)); 926 if (debugnv) { 927 VERIFY(0 == nvlist_add_nvlist(debugnv, 928 zhp->zfs_name, thisdbg)); 929 } 930 nvlist_free(thisdbg); 931 932 switch (errno) { 933 case EXDEV: 934 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 935 "not an earlier snapshot from the same fs")); 936 return (zfs_error(hdl, EZFS_CROSSTARGET, errbuf)); 937 938 case ENOENT: 939 if (zfs_dataset_exists(hdl, zc.zc_name, 940 ZFS_TYPE_SNAPSHOT)) { 941 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 942 "incremental source (@%s) does not exist"), 943 zc.zc_value); 944 } 945 return (zfs_error(hdl, EZFS_NOENT, errbuf)); 946 947 case EDQUOT: 948 case EFBIG: 949 case EIO: 950 case ENOLINK: 951 case ENOSPC: 952#ifdef sun 953 case ENOSTR: 954#endif 955 case ENXIO: 956 case EPIPE: 957 case ERANGE: 958 case EFAULT: 959 case EROFS: 960 zfs_error_aux(hdl, strerror(errno)); 961 return (zfs_error(hdl, EZFS_BADBACKUP, errbuf)); 962 963 default: 964 return (zfs_standard_error(hdl, errno, errbuf)); 965 } 966 } 967 968 if (debugnv) 969 VERIFY(0 == nvlist_add_nvlist(debugnv, zhp->zfs_name, thisdbg)); 970 nvlist_free(thisdbg); 971 972 return (0); 973} 974 975static void 976gather_holds(zfs_handle_t *zhp, send_dump_data_t *sdd) 977{ 978 assert(zhp->zfs_type == ZFS_TYPE_SNAPSHOT); 979 980 /* 981 * zfs_send() only sets snapholds for sends that need them, 982 * e.g. replication and doall. 983 */ 984 if (sdd->snapholds == NULL) 985 return; 986 987 fnvlist_add_string(sdd->snapholds, zhp->zfs_name, sdd->holdtag); 988} 989 990static void * 991send_progress_thread(void *arg) 992{ 993 progress_arg_t *pa = arg; 994 995 zfs_cmd_t zc = { 0 }; 996 zfs_handle_t *zhp = pa->pa_zhp; 997 libzfs_handle_t *hdl = zhp->zfs_hdl; 998 unsigned long long bytes; 999 char buf[16]; 1000 1001 time_t t; 1002 struct tm *tm; 1003 1004 assert(zhp->zfs_type == ZFS_TYPE_SNAPSHOT); 1005 (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name)); 1006 1007 if (!pa->pa_parsable) 1008 (void) fprintf(stderr, "TIME SENT SNAPSHOT\n"); 1009 1010 /* 1011 * Print the progress from ZFS_IOC_SEND_PROGRESS every second. 1012 */ 1013 for (;;) { 1014 (void) sleep(1); 1015 1016 zc.zc_cookie = pa->pa_fd; 1017 if (zfs_ioctl(hdl, ZFS_IOC_SEND_PROGRESS, &zc) != 0) 1018 return ((void *)-1); 1019 1020 (void) time(&t); 1021 tm = localtime(&t); 1022 bytes = zc.zc_cookie; 1023 1024 if (pa->pa_parsable) { 1025 (void) fprintf(stderr, "%02d:%02d:%02d\t%llu\t%s\n", 1026 tm->tm_hour, tm->tm_min, tm->tm_sec, 1027 bytes, zhp->zfs_name); 1028 } else { 1029 zfs_nicenum(bytes, buf, sizeof (buf)); 1030 (void) fprintf(stderr, "%02d:%02d:%02d %5s %s\n", 1031 tm->tm_hour, tm->tm_min, tm->tm_sec, 1032 buf, zhp->zfs_name); 1033 } 1034 } 1035} 1036 1037static int 1038dump_snapshot(zfs_handle_t *zhp, void *arg) 1039{ 1040 send_dump_data_t *sdd = arg; 1041 progress_arg_t pa = { 0 }; 1042 pthread_t tid; 1043 char *thissnap; 1044 int err; 1045 boolean_t isfromsnap, istosnap, fromorigin; 1046 boolean_t exclude = B_FALSE; 1047 1048 err = 0; 1049 thissnap = strchr(zhp->zfs_name, '@') + 1; 1050 isfromsnap = (sdd->fromsnap != NULL && 1051 strcmp(sdd->fromsnap, thissnap) == 0); 1052 1053 if (!sdd->seenfrom && isfromsnap) { 1054 gather_holds(zhp, sdd); 1055 sdd->seenfrom = B_TRUE; 1056 (void) strcpy(sdd->prevsnap, thissnap); 1057 sdd->prevsnap_obj = zfs_prop_get_int(zhp, ZFS_PROP_OBJSETID); 1058 zfs_close(zhp); 1059 return (0); 1060 } 1061 1062 if (sdd->seento || !sdd->seenfrom) { 1063 zfs_close(zhp); 1064 return (0); 1065 } 1066 1067 istosnap = (strcmp(sdd->tosnap, thissnap) == 0); 1068 if (istosnap) 1069 sdd->seento = B_TRUE; 1070 1071 if (!sdd->doall && !isfromsnap && !istosnap) { 1072 if (sdd->replicate) { 1073 char *snapname; 1074 nvlist_t *snapprops; 1075 /* 1076 * Filter out all intermediate snapshots except origin 1077 * snapshots needed to replicate clones. 1078 */ 1079 nvlist_t *nvfs = fsavl_find(sdd->fsavl, 1080 zhp->zfs_dmustats.dds_guid, &snapname); 1081 1082 VERIFY(0 == nvlist_lookup_nvlist(nvfs, 1083 "snapprops", &snapprops)); 1084 VERIFY(0 == nvlist_lookup_nvlist(snapprops, 1085 thissnap, &snapprops)); 1086 exclude = !nvlist_exists(snapprops, "is_clone_origin"); 1087 } else { 1088 exclude = B_TRUE; 1089 } 1090 } 1091 1092 /* 1093 * If a filter function exists, call it to determine whether 1094 * this snapshot will be sent. 1095 */ 1096 if (exclude || (sdd->filter_cb != NULL && 1097 sdd->filter_cb(zhp, sdd->filter_cb_arg) == B_FALSE)) { 1098 /* 1099 * This snapshot is filtered out. Don't send it, and don't 1100 * set prevsnap_obj, so it will be as if this snapshot didn't 1101 * exist, and the next accepted snapshot will be sent as 1102 * an incremental from the last accepted one, or as the 1103 * first (and full) snapshot in the case of a replication, 1104 * non-incremental send. 1105 */ 1106 zfs_close(zhp); 1107 return (0); 1108 } 1109 1110 gather_holds(zhp, sdd); 1111 fromorigin = sdd->prevsnap[0] == '\0' && 1112 (sdd->fromorigin || sdd->replicate); 1113 1114 if (sdd->verbose) { 1115 uint64_t size; 1116 err = estimate_ioctl(zhp, sdd->prevsnap_obj, 1117 fromorigin, &size); 1118 1119 if (sdd->parsable) { 1120 if (sdd->prevsnap[0] != '\0') { 1121 (void) fprintf(stderr, "incremental\t%s\t%s", 1122 sdd->prevsnap, zhp->zfs_name); 1123 } else { 1124 (void) fprintf(stderr, "full\t%s", 1125 zhp->zfs_name); 1126 } 1127 } else { 1128 (void) fprintf(stderr, dgettext(TEXT_DOMAIN, 1129 "send from @%s to %s"), 1130 sdd->prevsnap, zhp->zfs_name); 1131 } 1132 if (err == 0) { 1133 if (sdd->parsable) { 1134 (void) fprintf(stderr, "\t%llu\n", 1135 (longlong_t)size); 1136 } else { 1137 char buf[16]; 1138 zfs_nicenum(size, buf, sizeof (buf)); 1139 (void) fprintf(stderr, dgettext(TEXT_DOMAIN, 1140 " estimated size is %s\n"), buf); 1141 } 1142 sdd->size += size; 1143 } else { 1144 (void) fprintf(stderr, "\n"); 1145 } 1146 } 1147 1148 if (!sdd->dryrun) { 1149 /* 1150 * If progress reporting is requested, spawn a new thread to 1151 * poll ZFS_IOC_SEND_PROGRESS at a regular interval. 1152 */ 1153 if (sdd->progress) { 1154 pa.pa_zhp = zhp; 1155 pa.pa_fd = sdd->outfd; 1156 pa.pa_parsable = sdd->parsable; 1157 1158 if (err = pthread_create(&tid, NULL, 1159 send_progress_thread, &pa)) { 1160 zfs_close(zhp); 1161 return (err); 1162 } 1163 } 1164 1165 enum lzc_send_flags flags = 0; 1166 if (sdd->embed_data) 1167 flags |= LZC_SEND_FLAG_EMBED_DATA; 1168 1169 err = dump_ioctl(zhp, sdd->prevsnap, sdd->prevsnap_obj, 1170 fromorigin, sdd->outfd, flags, sdd->debugnv); 1171 1172 if (sdd->progress) { 1173 (void) pthread_cancel(tid); 1174 (void) pthread_join(tid, NULL); 1175 } 1176 } 1177 1178 (void) strcpy(sdd->prevsnap, thissnap); 1179 sdd->prevsnap_obj = zfs_prop_get_int(zhp, ZFS_PROP_OBJSETID); 1180 zfs_close(zhp); 1181 return (err); 1182} 1183 1184static int 1185dump_filesystem(zfs_handle_t *zhp, void *arg) 1186{ 1187 int rv = 0; 1188 send_dump_data_t *sdd = arg; 1189 boolean_t missingfrom = B_FALSE; 1190 zfs_cmd_t zc = { 0 }; 1191 1192 (void) snprintf(zc.zc_name, sizeof (zc.zc_name), "%s@%s", 1193 zhp->zfs_name, sdd->tosnap); 1194 if (ioctl(zhp->zfs_hdl->libzfs_fd, ZFS_IOC_OBJSET_STATS, &zc) != 0) { 1195 (void) fprintf(stderr, dgettext(TEXT_DOMAIN, 1196 "WARNING: could not send %s@%s: does not exist\n"), 1197 zhp->zfs_name, sdd->tosnap); 1198 sdd->err = B_TRUE; 1199 return (0); 1200 } 1201 1202 if (sdd->replicate && sdd->fromsnap) { 1203 /* 1204 * If this fs does not have fromsnap, and we're doing 1205 * recursive, we need to send a full stream from the 1206 * beginning (or an incremental from the origin if this 1207 * is a clone). If we're doing non-recursive, then let 1208 * them get the error. 1209 */ 1210 (void) snprintf(zc.zc_name, sizeof (zc.zc_name), "%s@%s", 1211 zhp->zfs_name, sdd->fromsnap); 1212 if (ioctl(zhp->zfs_hdl->libzfs_fd, 1213 ZFS_IOC_OBJSET_STATS, &zc) != 0) { 1214 missingfrom = B_TRUE; 1215 } 1216 } 1217 1218 sdd->seenfrom = sdd->seento = sdd->prevsnap[0] = 0; 1219 sdd->prevsnap_obj = 0; 1220 if (sdd->fromsnap == NULL || missingfrom) 1221 sdd->seenfrom = B_TRUE; 1222 1223 rv = zfs_iter_snapshots_sorted(zhp, dump_snapshot, arg); 1224 if (!sdd->seenfrom) { 1225 (void) fprintf(stderr, dgettext(TEXT_DOMAIN, 1226 "WARNING: could not send %s@%s:\n" 1227 "incremental source (%s@%s) does not exist\n"), 1228 zhp->zfs_name, sdd->tosnap, 1229 zhp->zfs_name, sdd->fromsnap); 1230 sdd->err = B_TRUE; 1231 } else if (!sdd->seento) { 1232 if (sdd->fromsnap) { 1233 (void) fprintf(stderr, dgettext(TEXT_DOMAIN, 1234 "WARNING: could not send %s@%s:\n" 1235 "incremental source (%s@%s) " 1236 "is not earlier than it\n"), 1237 zhp->zfs_name, sdd->tosnap, 1238 zhp->zfs_name, sdd->fromsnap); 1239 } else { 1240 (void) fprintf(stderr, dgettext(TEXT_DOMAIN, 1241 "WARNING: " 1242 "could not send %s@%s: does not exist\n"), 1243 zhp->zfs_name, sdd->tosnap); 1244 } 1245 sdd->err = B_TRUE; 1246 } 1247 1248 return (rv); 1249} 1250 1251static int 1252dump_filesystems(zfs_handle_t *rzhp, void *arg) 1253{ 1254 send_dump_data_t *sdd = arg; 1255 nvpair_t *fspair; 1256 boolean_t needagain, progress; 1257 1258 if (!sdd->replicate) 1259 return (dump_filesystem(rzhp, sdd)); 1260 1261 /* Mark the clone origin snapshots. */ 1262 for (fspair = nvlist_next_nvpair(sdd->fss, NULL); fspair; 1263 fspair = nvlist_next_nvpair(sdd->fss, fspair)) { 1264 nvlist_t *nvfs; 1265 uint64_t origin_guid = 0; 1266 1267 VERIFY(0 == nvpair_value_nvlist(fspair, &nvfs)); 1268 (void) nvlist_lookup_uint64(nvfs, "origin", &origin_guid); 1269 if (origin_guid != 0) { 1270 char *snapname; 1271 nvlist_t *origin_nv = fsavl_find(sdd->fsavl, 1272 origin_guid, &snapname); 1273 if (origin_nv != NULL) { 1274 nvlist_t *snapprops; 1275 VERIFY(0 == nvlist_lookup_nvlist(origin_nv, 1276 "snapprops", &snapprops)); 1277 VERIFY(0 == nvlist_lookup_nvlist(snapprops, 1278 snapname, &snapprops)); 1279 VERIFY(0 == nvlist_add_boolean( 1280 snapprops, "is_clone_origin")); 1281 } 1282 } 1283 } 1284again: 1285 needagain = progress = B_FALSE; 1286 for (fspair = nvlist_next_nvpair(sdd->fss, NULL); fspair; 1287 fspair = nvlist_next_nvpair(sdd->fss, fspair)) { 1288 nvlist_t *fslist, *parent_nv; 1289 char *fsname; 1290 zfs_handle_t *zhp; 1291 int err; 1292 uint64_t origin_guid = 0; 1293 uint64_t parent_guid = 0; 1294 1295 VERIFY(nvpair_value_nvlist(fspair, &fslist) == 0); 1296 if (nvlist_lookup_boolean(fslist, "sent") == 0) 1297 continue; 1298 1299 VERIFY(nvlist_lookup_string(fslist, "name", &fsname) == 0); 1300 (void) nvlist_lookup_uint64(fslist, "origin", &origin_guid); 1301 (void) nvlist_lookup_uint64(fslist, "parentfromsnap", 1302 &parent_guid); 1303 1304 if (parent_guid != 0) { 1305 parent_nv = fsavl_find(sdd->fsavl, parent_guid, NULL); 1306 if (!nvlist_exists(parent_nv, "sent")) { 1307 /* parent has not been sent; skip this one */ 1308 needagain = B_TRUE; 1309 continue; 1310 } 1311 } 1312 1313 if (origin_guid != 0) { 1314 nvlist_t *origin_nv = fsavl_find(sdd->fsavl, 1315 origin_guid, NULL); 1316 if (origin_nv != NULL && 1317 !nvlist_exists(origin_nv, "sent")) { 1318 /* 1319 * origin has not been sent yet; 1320 * skip this clone. 1321 */ 1322 needagain = B_TRUE; 1323 continue; 1324 } 1325 } 1326 1327 zhp = zfs_open(rzhp->zfs_hdl, fsname, ZFS_TYPE_DATASET); 1328 if (zhp == NULL) 1329 return (-1); 1330 err = dump_filesystem(zhp, sdd); 1331 VERIFY(nvlist_add_boolean(fslist, "sent") == 0); 1332 progress = B_TRUE; 1333 zfs_close(zhp); 1334 if (err) 1335 return (err); 1336 } 1337 if (needagain) { 1338 assert(progress); 1339 goto again; 1340 } 1341 1342 /* clean out the sent flags in case we reuse this fss */ 1343 for (fspair = nvlist_next_nvpair(sdd->fss, NULL); fspair; 1344 fspair = nvlist_next_nvpair(sdd->fss, fspair)) { 1345 nvlist_t *fslist; 1346 1347 VERIFY(nvpair_value_nvlist(fspair, &fslist) == 0); 1348 (void) nvlist_remove_all(fslist, "sent"); 1349 } 1350 1351 return (0); 1352} 1353 1354/* 1355 * Generate a send stream for the dataset identified by the argument zhp. 1356 * 1357 * The content of the send stream is the snapshot identified by 1358 * 'tosnap'. Incremental streams are requested in two ways: 1359 * - from the snapshot identified by "fromsnap" (if non-null) or 1360 * - from the origin of the dataset identified by zhp, which must 1361 * be a clone. In this case, "fromsnap" is null and "fromorigin" 1362 * is TRUE. 1363 * 1364 * The send stream is recursive (i.e. dumps a hierarchy of snapshots) and 1365 * uses a special header (with a hdrtype field of DMU_COMPOUNDSTREAM) 1366 * if "replicate" is set. If "doall" is set, dump all the intermediate 1367 * snapshots. The DMU_COMPOUNDSTREAM header is used in the "doall" 1368 * case too. If "props" is set, send properties. 1369 */ 1370int 1371zfs_send(zfs_handle_t *zhp, const char *fromsnap, const char *tosnap, 1372 sendflags_t *flags, int outfd, snapfilter_cb_t filter_func, 1373 void *cb_arg, nvlist_t **debugnvp) 1374{ 1375 char errbuf[1024]; 1376 send_dump_data_t sdd = { 0 }; 1377 int err = 0; 1378 nvlist_t *fss = NULL; 1379 avl_tree_t *fsavl = NULL; 1380 static uint64_t holdseq; 1381 int spa_version; 1382 pthread_t tid = 0; 1383 int pipefd[2]; 1384 dedup_arg_t dda = { 0 }; 1385 int featureflags = 0; 1386 1387 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN, 1388 "cannot send '%s'"), zhp->zfs_name); 1389 1390 if (fromsnap && fromsnap[0] == '\0') { 1391 zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN, 1392 "zero-length incremental source")); 1393 return (zfs_error(zhp->zfs_hdl, EZFS_NOENT, errbuf)); 1394 } 1395 1396 if (zhp->zfs_type == ZFS_TYPE_FILESYSTEM) { 1397 uint64_t version; 1398 version = zfs_prop_get_int(zhp, ZFS_PROP_VERSION); 1399 if (version >= ZPL_VERSION_SA) { 1400 featureflags |= DMU_BACKUP_FEATURE_SA_SPILL; 1401 } 1402 } 1403 1404 if (flags->dedup && !flags->dryrun) { 1405 featureflags |= (DMU_BACKUP_FEATURE_DEDUP | 1406 DMU_BACKUP_FEATURE_DEDUPPROPS); 1407 if (err = pipe(pipefd)) { 1408 zfs_error_aux(zhp->zfs_hdl, strerror(errno)); 1409 return (zfs_error(zhp->zfs_hdl, EZFS_PIPEFAILED, 1410 errbuf)); 1411 } 1412 dda.outputfd = outfd; 1413 dda.inputfd = pipefd[1]; 1414 dda.dedup_hdl = zhp->zfs_hdl; 1415 if (err = pthread_create(&tid, NULL, cksummer, &dda)) { 1416 (void) close(pipefd[0]); 1417 (void) close(pipefd[1]); 1418 zfs_error_aux(zhp->zfs_hdl, strerror(errno)); 1419 return (zfs_error(zhp->zfs_hdl, 1420 EZFS_THREADCREATEFAILED, errbuf)); 1421 } 1422 } 1423 1424 if (flags->replicate || flags->doall || flags->props) { 1425 dmu_replay_record_t drr = { 0 }; 1426 char *packbuf = NULL; 1427 size_t buflen = 0; 1428 zio_cksum_t zc = { 0 }; 1429 1430 if (flags->replicate || flags->props) { 1431 nvlist_t *hdrnv; 1432 1433 VERIFY(0 == nvlist_alloc(&hdrnv, NV_UNIQUE_NAME, 0)); 1434 if (fromsnap) { 1435 VERIFY(0 == nvlist_add_string(hdrnv, 1436 "fromsnap", fromsnap)); 1437 } 1438 VERIFY(0 == nvlist_add_string(hdrnv, "tosnap", tosnap)); 1439 if (!flags->replicate) { 1440 VERIFY(0 == nvlist_add_boolean(hdrnv, 1441 "not_recursive")); 1442 } 1443 1444 err = gather_nvlist(zhp->zfs_hdl, zhp->zfs_name, 1445 fromsnap, tosnap, flags->replicate, &fss, &fsavl); 1446 if (err) 1447 goto err_out; 1448 VERIFY(0 == nvlist_add_nvlist(hdrnv, "fss", fss)); 1449 err = nvlist_pack(hdrnv, &packbuf, &buflen, 1450 NV_ENCODE_XDR, 0); 1451 if (debugnvp) 1452 *debugnvp = hdrnv; 1453 else 1454 nvlist_free(hdrnv); 1455 if (err) 1456 goto stderr_out; 1457 } 1458 1459 if (!flags->dryrun) { 1460 /* write first begin record */ 1461 drr.drr_type = DRR_BEGIN; 1462 drr.drr_u.drr_begin.drr_magic = DMU_BACKUP_MAGIC; 1463 DMU_SET_STREAM_HDRTYPE(drr.drr_u.drr_begin. 1464 drr_versioninfo, DMU_COMPOUNDSTREAM); 1465 DMU_SET_FEATUREFLAGS(drr.drr_u.drr_begin. 1466 drr_versioninfo, featureflags); 1467 (void) snprintf(drr.drr_u.drr_begin.drr_toname, 1468 sizeof (drr.drr_u.drr_begin.drr_toname), 1469 "%s@%s", zhp->zfs_name, tosnap); 1470 drr.drr_payloadlen = buflen; 1471 err = cksum_and_write(&drr, sizeof (drr), &zc, outfd); 1472 1473 /* write header nvlist */ 1474 if (err != -1 && packbuf != NULL) { 1475 err = cksum_and_write(packbuf, buflen, &zc, 1476 outfd); 1477 } 1478 free(packbuf); 1479 if (err == -1) { 1480 err = errno; 1481 goto stderr_out; 1482 } 1483 1484 /* write end record */ 1485 bzero(&drr, sizeof (drr)); 1486 drr.drr_type = DRR_END; 1487 drr.drr_u.drr_end.drr_checksum = zc; 1488 err = write(outfd, &drr, sizeof (drr)); 1489 if (err == -1) { 1490 err = errno; 1491 goto stderr_out; 1492 } 1493 1494 err = 0; 1495 } 1496 } 1497 1498 /* dump each stream */ 1499 sdd.fromsnap = fromsnap; 1500 sdd.tosnap = tosnap; 1501 if (tid != 0) 1502 sdd.outfd = pipefd[0]; 1503 else 1504 sdd.outfd = outfd; 1505 sdd.replicate = flags->replicate; 1506 sdd.doall = flags->doall; 1507 sdd.fromorigin = flags->fromorigin; 1508 sdd.fss = fss; 1509 sdd.fsavl = fsavl; 1510 sdd.verbose = flags->verbose; 1511 sdd.parsable = flags->parsable; 1512 sdd.progress = flags->progress; 1513 sdd.dryrun = flags->dryrun; 1514 sdd.embed_data = flags->embed_data; 1515 sdd.filter_cb = filter_func; 1516 sdd.filter_cb_arg = cb_arg; 1517 if (debugnvp) 1518 sdd.debugnv = *debugnvp; 1519 1520 /* 1521 * Some flags require that we place user holds on the datasets that are 1522 * being sent so they don't get destroyed during the send. We can skip 1523 * this step if the pool is imported read-only since the datasets cannot 1524 * be destroyed. 1525 */ 1526 if (!flags->dryrun && !zpool_get_prop_int(zfs_get_pool_handle(zhp), 1527 ZPOOL_PROP_READONLY, NULL) && 1528 zfs_spa_version(zhp, &spa_version) == 0 && 1529 spa_version >= SPA_VERSION_USERREFS && 1530 (flags->doall || flags->replicate)) { 1531 ++holdseq; 1532 (void) snprintf(sdd.holdtag, sizeof (sdd.holdtag), 1533 ".send-%d-%llu", getpid(), (u_longlong_t)holdseq); 1534 sdd.cleanup_fd = open(ZFS_DEV, O_RDWR|O_EXCL); 1535 if (sdd.cleanup_fd < 0) { 1536 err = errno; 1537 goto stderr_out; 1538 } 1539 sdd.snapholds = fnvlist_alloc(); 1540 } else { 1541 sdd.cleanup_fd = -1; 1542 sdd.snapholds = NULL; 1543 } 1544 if (flags->verbose || sdd.snapholds != NULL) { 1545 /* 1546 * Do a verbose no-op dry run to get all the verbose output 1547 * or to gather snapshot hold's before generating any data, 1548 * then do a non-verbose real run to generate the streams. 1549 */ 1550 sdd.dryrun = B_TRUE; 1551 err = dump_filesystems(zhp, &sdd); 1552 1553 if (err != 0) 1554 goto stderr_out; 1555 1556 if (flags->verbose) { 1557 if (flags->parsable) { 1558 (void) fprintf(stderr, "size\t%llu\n", 1559 (longlong_t)sdd.size); 1560 } else { 1561 char buf[16]; 1562 zfs_nicenum(sdd.size, buf, sizeof (buf)); 1563 (void) fprintf(stderr, dgettext(TEXT_DOMAIN, 1564 "total estimated size is %s\n"), buf); 1565 } 1566 } 1567 1568 /* Ensure no snaps found is treated as an error. */ 1569 if (!sdd.seento) { 1570 err = ENOENT; 1571 goto err_out; 1572 } 1573 1574 /* Skip the second run if dryrun was requested. */ 1575 if (flags->dryrun) 1576 goto err_out; 1577 1578 if (sdd.snapholds != NULL) { 1579 err = zfs_hold_nvl(zhp, sdd.cleanup_fd, sdd.snapholds); 1580 if (err != 0) 1581 goto stderr_out; 1582 1583 fnvlist_free(sdd.snapholds); 1584 sdd.snapholds = NULL; 1585 } 1586 1587 sdd.dryrun = B_FALSE; 1588 sdd.verbose = B_FALSE; 1589 } 1590 1591 err = dump_filesystems(zhp, &sdd); 1592 fsavl_destroy(fsavl); 1593 nvlist_free(fss); 1594 1595 /* Ensure no snaps found is treated as an error. */ 1596 if (err == 0 && !sdd.seento) 1597 err = ENOENT; 1598 1599 if (tid != 0) { 1600 if (err != 0) 1601 (void) pthread_cancel(tid); 1602 (void) close(pipefd[0]); 1603 (void) pthread_join(tid, NULL); 1604 } 1605 1606 if (sdd.cleanup_fd != -1) { 1607 VERIFY(0 == close(sdd.cleanup_fd)); 1608 sdd.cleanup_fd = -1; 1609 } 1610 1611 if (!flags->dryrun && (flags->replicate || flags->doall || 1612 flags->props)) { 1613 /* 1614 * write final end record. NB: want to do this even if 1615 * there was some error, because it might not be totally 1616 * failed. 1617 */ 1618 dmu_replay_record_t drr = { 0 }; 1619 drr.drr_type = DRR_END; 1620 if (write(outfd, &drr, sizeof (drr)) == -1) { 1621 return (zfs_standard_error(zhp->zfs_hdl, 1622 errno, errbuf)); 1623 } 1624 } 1625 1626 return (err || sdd.err); 1627 1628stderr_out: 1629 err = zfs_standard_error(zhp->zfs_hdl, err, errbuf); 1630err_out: 1631 fsavl_destroy(fsavl); 1632 nvlist_free(fss); 1633 fnvlist_free(sdd.snapholds); 1634 1635 if (sdd.cleanup_fd != -1) 1636 VERIFY(0 == close(sdd.cleanup_fd)); 1637 if (tid != 0) { 1638 (void) pthread_cancel(tid); 1639 (void) close(pipefd[0]); 1640 (void) pthread_join(tid, NULL); 1641 } 1642 return (err); 1643} 1644 1645int 1646zfs_send_one(zfs_handle_t *zhp, const char *from, int fd, 1647 enum lzc_send_flags flags) 1648{ 1649 int err; 1650 libzfs_handle_t *hdl = zhp->zfs_hdl; 1651 1652 char errbuf[1024]; 1653 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN, 1654 "warning: cannot send '%s'"), zhp->zfs_name); 1655 1656 err = lzc_send(zhp->zfs_name, from, fd, flags); 1657 if (err != 0) { 1658 switch (errno) { 1659 case EXDEV: 1660 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 1661 "not an earlier snapshot from the same fs")); 1662 return (zfs_error(hdl, EZFS_CROSSTARGET, errbuf)); 1663 1664 case ENOENT: 1665 case ESRCH: 1666 if (lzc_exists(zhp->zfs_name)) { 1667 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 1668 "incremental source (%s) does not exist"), 1669 from); 1670 } 1671 return (zfs_error(hdl, EZFS_NOENT, errbuf)); 1672 1673 case EBUSY: 1674 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 1675 "target is busy; if a filesystem, " 1676 "it must not be mounted")); 1677 return (zfs_error(hdl, EZFS_BUSY, errbuf)); 1678 1679 case EDQUOT: 1680 case EFBIG: 1681 case EIO: 1682 case ENOLINK: 1683 case ENOSPC: 1684#ifdef illumos 1685 case ENOSTR: 1686#endif 1687 case ENXIO: 1688 case EPIPE: 1689 case ERANGE: 1690 case EFAULT: 1691 case EROFS: 1692 zfs_error_aux(hdl, strerror(errno)); 1693 return (zfs_error(hdl, EZFS_BADBACKUP, errbuf)); 1694 1695 default: 1696 return (zfs_standard_error(hdl, errno, errbuf)); 1697 } 1698 } 1699 return (err != 0); 1700} 1701 1702/* 1703 * Routines specific to "zfs recv" 1704 */ 1705 1706static int 1707recv_read(libzfs_handle_t *hdl, int fd, void *buf, int ilen, 1708 boolean_t byteswap, zio_cksum_t *zc) 1709{ 1710 char *cp = buf; 1711 int rv; 1712 int len = ilen; 1713 1714 do { 1715 rv = read(fd, cp, len); 1716 cp += rv; 1717 len -= rv; 1718 } while (rv > 0); 1719 1720 if (rv < 0 || len != 0) { 1721 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 1722 "failed to read from stream")); 1723 return (zfs_error(hdl, EZFS_BADSTREAM, dgettext(TEXT_DOMAIN, 1724 "cannot receive"))); 1725 } 1726 1727 if (zc) { 1728 if (byteswap) 1729 fletcher_4_incremental_byteswap(buf, ilen, zc); 1730 else 1731 fletcher_4_incremental_native(buf, ilen, zc); 1732 } 1733 return (0); 1734} 1735 1736static int 1737recv_read_nvlist(libzfs_handle_t *hdl, int fd, int len, nvlist_t **nvp, 1738 boolean_t byteswap, zio_cksum_t *zc) 1739{ 1740 char *buf; 1741 int err; 1742 1743 buf = zfs_alloc(hdl, len); 1744 if (buf == NULL) 1745 return (ENOMEM); 1746 1747 err = recv_read(hdl, fd, buf, len, byteswap, zc); 1748 if (err != 0) { 1749 free(buf); 1750 return (err); 1751 } 1752 1753 err = nvlist_unpack(buf, len, nvp, 0); 1754 free(buf); 1755 if (err != 0) { 1756 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "invalid " 1757 "stream (malformed nvlist)")); 1758 return (EINVAL); 1759 } 1760 return (0); 1761} 1762 1763static int 1764recv_rename(libzfs_handle_t *hdl, const char *name, const char *tryname, 1765 int baselen, char *newname, recvflags_t *flags) 1766{ 1767 static int seq; 1768 zfs_cmd_t zc = { 0 }; 1769 int err; 1770 prop_changelist_t *clp; 1771 zfs_handle_t *zhp; 1772 1773 zhp = zfs_open(hdl, name, ZFS_TYPE_DATASET); 1774 if (zhp == NULL) 1775 return (-1); 1776 clp = changelist_gather(zhp, ZFS_PROP_NAME, 0, 1777 flags->force ? MS_FORCE : 0); 1778 zfs_close(zhp); 1779 if (clp == NULL) 1780 return (-1); 1781 err = changelist_prefix(clp); 1782 if (err) 1783 return (err); 1784 1785 zc.zc_objset_type = DMU_OST_ZFS; 1786 (void) strlcpy(zc.zc_name, name, sizeof (zc.zc_name)); 1787 1788 if (tryname) { 1789 (void) strcpy(newname, tryname); 1790 1791 (void) strlcpy(zc.zc_value, tryname, sizeof (zc.zc_value)); 1792 1793 if (flags->verbose) { 1794 (void) printf("attempting rename %s to %s\n", 1795 zc.zc_name, zc.zc_value); 1796 } 1797 err = ioctl(hdl->libzfs_fd, ZFS_IOC_RENAME, &zc); 1798 if (err == 0) 1799 changelist_rename(clp, name, tryname); 1800 } else { 1801 err = ENOENT; 1802 } 1803 1804 if (err != 0 && strncmp(name + baselen, "recv-", 5) != 0) { 1805 seq++; 1806 1807 (void) snprintf(newname, ZFS_MAXNAMELEN, "%.*srecv-%u-%u", 1808 baselen, name, getpid(), seq); 1809 (void) strlcpy(zc.zc_value, newname, sizeof (zc.zc_value)); 1810 1811 if (flags->verbose) { 1812 (void) printf("failed - trying rename %s to %s\n", 1813 zc.zc_name, zc.zc_value); 1814 } 1815 err = ioctl(hdl->libzfs_fd, ZFS_IOC_RENAME, &zc); 1816 if (err == 0) 1817 changelist_rename(clp, name, newname); 1818 if (err && flags->verbose) { 1819 (void) printf("failed (%u) - " 1820 "will try again on next pass\n", errno); 1821 } 1822 err = EAGAIN; 1823 } else if (flags->verbose) { 1824 if (err == 0) 1825 (void) printf("success\n"); 1826 else 1827 (void) printf("failed (%u)\n", errno); 1828 } 1829 1830 (void) changelist_postfix(clp); 1831 changelist_free(clp); 1832 1833 return (err); 1834} 1835 1836static int 1837recv_destroy(libzfs_handle_t *hdl, const char *name, int baselen, 1838 char *newname, recvflags_t *flags) 1839{ 1840 zfs_cmd_t zc = { 0 }; 1841 int err = 0; 1842 prop_changelist_t *clp; 1843 zfs_handle_t *zhp; 1844 boolean_t defer = B_FALSE; 1845 int spa_version; 1846 1847 zhp = zfs_open(hdl, name, ZFS_TYPE_DATASET); 1848 if (zhp == NULL) 1849 return (-1); 1850 clp = changelist_gather(zhp, ZFS_PROP_NAME, 0, 1851 flags->force ? MS_FORCE : 0); 1852 if (zfs_get_type(zhp) == ZFS_TYPE_SNAPSHOT && 1853 zfs_spa_version(zhp, &spa_version) == 0 && 1854 spa_version >= SPA_VERSION_USERREFS) 1855 defer = B_TRUE; 1856 zfs_close(zhp); 1857 if (clp == NULL) 1858 return (-1); 1859 err = changelist_prefix(clp); 1860 if (err) 1861 return (err); 1862 1863 zc.zc_objset_type = DMU_OST_ZFS; 1864 zc.zc_defer_destroy = defer; 1865 (void) strlcpy(zc.zc_name, name, sizeof (zc.zc_name)); 1866 1867 if (flags->verbose) 1868 (void) printf("attempting destroy %s\n", zc.zc_name); 1869 err = ioctl(hdl->libzfs_fd, ZFS_IOC_DESTROY, &zc); 1870 if (err == 0) { 1871 if (flags->verbose) 1872 (void) printf("success\n"); 1873 changelist_remove(clp, zc.zc_name); 1874 } 1875 1876 (void) changelist_postfix(clp); 1877 changelist_free(clp); 1878 1879 /* 1880 * Deferred destroy might destroy the snapshot or only mark it to be 1881 * destroyed later, and it returns success in either case. 1882 */ 1883 if (err != 0 || (defer && zfs_dataset_exists(hdl, name, 1884 ZFS_TYPE_SNAPSHOT))) { 1885 err = recv_rename(hdl, name, NULL, baselen, newname, flags); 1886 } 1887 1888 return (err); 1889} 1890 1891typedef struct guid_to_name_data { 1892 uint64_t guid; 1893 char *name; 1894 char *skip; 1895} guid_to_name_data_t; 1896 1897static int 1898guid_to_name_cb(zfs_handle_t *zhp, void *arg) 1899{ 1900 guid_to_name_data_t *gtnd = arg; 1901 int err; 1902 1903 if (gtnd->skip != NULL && 1904 strcmp(zhp->zfs_name, gtnd->skip) == 0) { 1905 return (0); 1906 } 1907 1908 if (zhp->zfs_dmustats.dds_guid == gtnd->guid) { 1909 (void) strcpy(gtnd->name, zhp->zfs_name); 1910 zfs_close(zhp); 1911 return (EEXIST); 1912 } 1913 1914 err = zfs_iter_children(zhp, guid_to_name_cb, gtnd); 1915 zfs_close(zhp); 1916 return (err); 1917} 1918 1919/* 1920 * Attempt to find the local dataset associated with this guid. In the case of 1921 * multiple matches, we attempt to find the "best" match by searching 1922 * progressively larger portions of the hierarchy. This allows one to send a 1923 * tree of datasets individually and guarantee that we will find the source 1924 * guid within that hierarchy, even if there are multiple matches elsewhere. 1925 */ 1926static int 1927guid_to_name(libzfs_handle_t *hdl, const char *parent, uint64_t guid, 1928 char *name) 1929{ 1930 /* exhaustive search all local snapshots */ 1931 char pname[ZFS_MAXNAMELEN]; 1932 guid_to_name_data_t gtnd; 1933 int err = 0; 1934 zfs_handle_t *zhp; 1935 char *cp; 1936 1937 gtnd.guid = guid; 1938 gtnd.name = name; 1939 gtnd.skip = NULL; 1940 1941 (void) strlcpy(pname, parent, sizeof (pname)); 1942 1943 /* 1944 * Search progressively larger portions of the hierarchy. This will 1945 * select the "most local" version of the origin snapshot in the case 1946 * that there are multiple matching snapshots in the system. 1947 */ 1948 while ((cp = strrchr(pname, '/')) != NULL) { 1949 1950 /* Chop off the last component and open the parent */ 1951 *cp = '\0'; 1952 zhp = make_dataset_handle(hdl, pname); 1953 1954 if (zhp == NULL) 1955 continue; 1956 1957 err = zfs_iter_children(zhp, guid_to_name_cb, >nd); 1958 zfs_close(zhp); 1959 if (err == EEXIST) 1960 return (0); 1961 1962 /* 1963 * Remember the dataset that we already searched, so we 1964 * skip it next time through. 1965 */ 1966 gtnd.skip = pname; 1967 } 1968 1969 return (ENOENT); 1970} 1971 1972/* 1973 * Return +1 if guid1 is before guid2, 0 if they are the same, and -1 if 1974 * guid1 is after guid2. 1975 */ 1976static int 1977created_before(libzfs_handle_t *hdl, avl_tree_t *avl, 1978 uint64_t guid1, uint64_t guid2) 1979{ 1980 nvlist_t *nvfs; 1981 char *fsname, *snapname; 1982 char buf[ZFS_MAXNAMELEN]; 1983 int rv; 1984 zfs_handle_t *guid1hdl, *guid2hdl; 1985 uint64_t create1, create2; 1986 1987 if (guid2 == 0) 1988 return (0); 1989 if (guid1 == 0) 1990 return (1); 1991 1992 nvfs = fsavl_find(avl, guid1, &snapname); 1993 VERIFY(0 == nvlist_lookup_string(nvfs, "name", &fsname)); 1994 (void) snprintf(buf, sizeof (buf), "%s@%s", fsname, snapname); 1995 guid1hdl = zfs_open(hdl, buf, ZFS_TYPE_SNAPSHOT); 1996 if (guid1hdl == NULL) 1997 return (-1); 1998 1999 nvfs = fsavl_find(avl, guid2, &snapname); 2000 VERIFY(0 == nvlist_lookup_string(nvfs, "name", &fsname)); 2001 (void) snprintf(buf, sizeof (buf), "%s@%s", fsname, snapname); 2002 guid2hdl = zfs_open(hdl, buf, ZFS_TYPE_SNAPSHOT); 2003 if (guid2hdl == NULL) { 2004 zfs_close(guid1hdl); 2005 return (-1); 2006 } 2007 2008 create1 = zfs_prop_get_int(guid1hdl, ZFS_PROP_CREATETXG); 2009 create2 = zfs_prop_get_int(guid2hdl, ZFS_PROP_CREATETXG); 2010 2011 if (create1 < create2) 2012 rv = -1; 2013 else if (create1 > create2) 2014 rv = +1; 2015 else 2016 rv = 0; 2017 2018 zfs_close(guid1hdl); 2019 zfs_close(guid2hdl); 2020 2021 return (rv); 2022} 2023 2024static int 2025recv_incremental_replication(libzfs_handle_t *hdl, const char *tofs, 2026 recvflags_t *flags, nvlist_t *stream_nv, avl_tree_t *stream_avl, 2027 nvlist_t *renamed) 2028{ 2029 nvlist_t *local_nv, *deleted = NULL; 2030 avl_tree_t *local_avl; 2031 nvpair_t *fselem, *nextfselem; 2032 char *fromsnap; 2033 char newname[ZFS_MAXNAMELEN]; 2034 char guidname[32]; 2035 int error; 2036 boolean_t needagain, progress, recursive; 2037 char *s1, *s2; 2038 2039 VERIFY(0 == nvlist_lookup_string(stream_nv, "fromsnap", &fromsnap)); 2040 2041 recursive = (nvlist_lookup_boolean(stream_nv, "not_recursive") == 2042 ENOENT); 2043 2044 if (flags->dryrun) 2045 return (0); 2046 2047again: 2048 needagain = progress = B_FALSE; 2049 2050 VERIFY(0 == nvlist_alloc(&deleted, NV_UNIQUE_NAME, 0)); 2051 2052 if ((error = gather_nvlist(hdl, tofs, fromsnap, NULL, 2053 recursive, &local_nv, &local_avl)) != 0) 2054 return (error); 2055 2056 /* 2057 * Process deletes and renames 2058 */ 2059 for (fselem = nvlist_next_nvpair(local_nv, NULL); 2060 fselem; fselem = nextfselem) { 2061 nvlist_t *nvfs, *snaps; 2062 nvlist_t *stream_nvfs = NULL; 2063 nvpair_t *snapelem, *nextsnapelem; 2064 uint64_t fromguid = 0; 2065 uint64_t originguid = 0; 2066 uint64_t stream_originguid = 0; 2067 uint64_t parent_fromsnap_guid, stream_parent_fromsnap_guid; 2068 char *fsname, *stream_fsname; 2069 2070 nextfselem = nvlist_next_nvpair(local_nv, fselem); 2071 2072 VERIFY(0 == nvpair_value_nvlist(fselem, &nvfs)); 2073 VERIFY(0 == nvlist_lookup_nvlist(nvfs, "snaps", &snaps)); 2074 VERIFY(0 == nvlist_lookup_string(nvfs, "name", &fsname)); 2075 VERIFY(0 == nvlist_lookup_uint64(nvfs, "parentfromsnap", 2076 &parent_fromsnap_guid)); 2077 (void) nvlist_lookup_uint64(nvfs, "origin", &originguid); 2078 2079 /* 2080 * First find the stream's fs, so we can check for 2081 * a different origin (due to "zfs promote") 2082 */ 2083 for (snapelem = nvlist_next_nvpair(snaps, NULL); 2084 snapelem; snapelem = nvlist_next_nvpair(snaps, snapelem)) { 2085 uint64_t thisguid; 2086 2087 VERIFY(0 == nvpair_value_uint64(snapelem, &thisguid)); 2088 stream_nvfs = fsavl_find(stream_avl, thisguid, NULL); 2089 2090 if (stream_nvfs != NULL) 2091 break; 2092 } 2093 2094 /* check for promote */ 2095 (void) nvlist_lookup_uint64(stream_nvfs, "origin", 2096 &stream_originguid); 2097 if (stream_nvfs && originguid != stream_originguid) { 2098 switch (created_before(hdl, local_avl, 2099 stream_originguid, originguid)) { 2100 case 1: { 2101 /* promote it! */ 2102 zfs_cmd_t zc = { 0 }; 2103 nvlist_t *origin_nvfs; 2104 char *origin_fsname; 2105 2106 if (flags->verbose) 2107 (void) printf("promoting %s\n", fsname); 2108 2109 origin_nvfs = fsavl_find(local_avl, originguid, 2110 NULL); 2111 VERIFY(0 == nvlist_lookup_string(origin_nvfs, 2112 "name", &origin_fsname)); 2113 (void) strlcpy(zc.zc_value, origin_fsname, 2114 sizeof (zc.zc_value)); 2115 (void) strlcpy(zc.zc_name, fsname, 2116 sizeof (zc.zc_name)); 2117 error = zfs_ioctl(hdl, ZFS_IOC_PROMOTE, &zc); 2118 if (error == 0) 2119 progress = B_TRUE; 2120 break; 2121 } 2122 default: 2123 break; 2124 case -1: 2125 fsavl_destroy(local_avl); 2126 nvlist_free(local_nv); 2127 return (-1); 2128 } 2129 /* 2130 * We had/have the wrong origin, therefore our 2131 * list of snapshots is wrong. Need to handle 2132 * them on the next pass. 2133 */ 2134 needagain = B_TRUE; 2135 continue; 2136 } 2137 2138 for (snapelem = nvlist_next_nvpair(snaps, NULL); 2139 snapelem; snapelem = nextsnapelem) { 2140 uint64_t thisguid; 2141 char *stream_snapname; 2142 nvlist_t *found, *props; 2143 2144 nextsnapelem = nvlist_next_nvpair(snaps, snapelem); 2145 2146 VERIFY(0 == nvpair_value_uint64(snapelem, &thisguid)); 2147 found = fsavl_find(stream_avl, thisguid, 2148 &stream_snapname); 2149 2150 /* check for delete */ 2151 if (found == NULL) { 2152 char name[ZFS_MAXNAMELEN]; 2153 2154 if (!flags->force) 2155 continue; 2156 2157 (void) snprintf(name, sizeof (name), "%s@%s", 2158 fsname, nvpair_name(snapelem)); 2159 2160 error = recv_destroy(hdl, name, 2161 strlen(fsname)+1, newname, flags); 2162 if (error) 2163 needagain = B_TRUE; 2164 else 2165 progress = B_TRUE; 2166 sprintf(guidname, "%lu", thisguid); 2167 nvlist_add_boolean(deleted, guidname); 2168 continue; 2169 } 2170 2171 stream_nvfs = found; 2172 2173 if (0 == nvlist_lookup_nvlist(stream_nvfs, "snapprops", 2174 &props) && 0 == nvlist_lookup_nvlist(props, 2175 stream_snapname, &props)) { 2176 zfs_cmd_t zc = { 0 }; 2177 2178 zc.zc_cookie = B_TRUE; /* received */ 2179 (void) snprintf(zc.zc_name, sizeof (zc.zc_name), 2180 "%s@%s", fsname, nvpair_name(snapelem)); 2181 if (zcmd_write_src_nvlist(hdl, &zc, 2182 props) == 0) { 2183 (void) zfs_ioctl(hdl, 2184 ZFS_IOC_SET_PROP, &zc); 2185 zcmd_free_nvlists(&zc); 2186 } 2187 } 2188 2189 /* check for different snapname */ 2190 if (strcmp(nvpair_name(snapelem), 2191 stream_snapname) != 0) { 2192 char name[ZFS_MAXNAMELEN]; 2193 char tryname[ZFS_MAXNAMELEN]; 2194 2195 (void) snprintf(name, sizeof (name), "%s@%s", 2196 fsname, nvpair_name(snapelem)); 2197 (void) snprintf(tryname, sizeof (name), "%s@%s", 2198 fsname, stream_snapname); 2199 2200 error = recv_rename(hdl, name, tryname, 2201 strlen(fsname)+1, newname, flags); 2202 if (error) 2203 needagain = B_TRUE; 2204 else 2205 progress = B_TRUE; 2206 } 2207 2208 if (strcmp(stream_snapname, fromsnap) == 0) 2209 fromguid = thisguid; 2210 } 2211 2212 /* check for delete */ 2213 if (stream_nvfs == NULL) { 2214 if (!flags->force) 2215 continue; 2216 2217 error = recv_destroy(hdl, fsname, strlen(tofs)+1, 2218 newname, flags); 2219 if (error) 2220 needagain = B_TRUE; 2221 else 2222 progress = B_TRUE; 2223 sprintf(guidname, "%lu", parent_fromsnap_guid); 2224 nvlist_add_boolean(deleted, guidname); 2225 continue; 2226 } 2227 2228 if (fromguid == 0) { 2229 if (flags->verbose) { 2230 (void) printf("local fs %s does not have " 2231 "fromsnap (%s in stream); must have " 2232 "been deleted locally; ignoring\n", 2233 fsname, fromsnap); 2234 } 2235 continue; 2236 } 2237 2238 VERIFY(0 == nvlist_lookup_string(stream_nvfs, 2239 "name", &stream_fsname)); 2240 VERIFY(0 == nvlist_lookup_uint64(stream_nvfs, 2241 "parentfromsnap", &stream_parent_fromsnap_guid)); 2242 2243 s1 = strrchr(fsname, '/'); 2244 s2 = strrchr(stream_fsname, '/'); 2245 2246 /* 2247 * Check if we're going to rename based on parent guid change 2248 * and the current parent guid was also deleted. If it was then 2249 * rename will fail and is likely unneeded, so avoid this and 2250 * force an early retry to determine the new 2251 * parent_fromsnap_guid. 2252 */ 2253 if (stream_parent_fromsnap_guid != 0 && 2254 parent_fromsnap_guid != 0 && 2255 stream_parent_fromsnap_guid != parent_fromsnap_guid) { 2256 sprintf(guidname, "%lu", parent_fromsnap_guid); 2257 if (nvlist_exists(deleted, guidname)) { 2258 progress = B_TRUE; 2259 needagain = B_TRUE; 2260 goto doagain; 2261 } 2262 } 2263 2264 /* 2265 * Check for rename. If the exact receive path is specified, it 2266 * does not count as a rename, but we still need to check the 2267 * datasets beneath it. 2268 */ 2269 if ((stream_parent_fromsnap_guid != 0 && 2270 parent_fromsnap_guid != 0 && 2271 stream_parent_fromsnap_guid != parent_fromsnap_guid) || 2272 ((flags->isprefix || strcmp(tofs, fsname) != 0) && 2273 (s1 != NULL) && (s2 != NULL) && strcmp(s1, s2) != 0)) { 2274 nvlist_t *parent; 2275 char tryname[ZFS_MAXNAMELEN]; 2276 2277 parent = fsavl_find(local_avl, 2278 stream_parent_fromsnap_guid, NULL); 2279 /* 2280 * NB: parent might not be found if we used the 2281 * tosnap for stream_parent_fromsnap_guid, 2282 * because the parent is a newly-created fs; 2283 * we'll be able to rename it after we recv the 2284 * new fs. 2285 */ 2286 if (parent != NULL) { 2287 char *pname; 2288 2289 VERIFY(0 == nvlist_lookup_string(parent, "name", 2290 &pname)); 2291 (void) snprintf(tryname, sizeof (tryname), 2292 "%s%s", pname, strrchr(stream_fsname, '/')); 2293 } else { 2294 tryname[0] = '\0'; 2295 if (flags->verbose) { 2296 (void) printf("local fs %s new parent " 2297 "not found\n", fsname); 2298 } 2299 } 2300 2301 newname[0] = '\0'; 2302 2303 error = recv_rename(hdl, fsname, tryname, 2304 strlen(tofs)+1, newname, flags); 2305 2306 if (renamed != NULL && newname[0] != '\0') { 2307 VERIFY(0 == nvlist_add_boolean(renamed, 2308 newname)); 2309 } 2310 2311 if (error) 2312 needagain = B_TRUE; 2313 else 2314 progress = B_TRUE; 2315 } 2316 } 2317 2318doagain: 2319 fsavl_destroy(local_avl); 2320 nvlist_free(local_nv); 2321 nvlist_free(deleted); 2322 2323 if (needagain && progress) { 2324 /* do another pass to fix up temporary names */ 2325 if (flags->verbose) 2326 (void) printf("another pass:\n"); 2327 goto again; 2328 } 2329 2330 return (needagain); 2331} 2332 2333static int 2334zfs_receive_package(libzfs_handle_t *hdl, int fd, const char *destname, 2335 recvflags_t *flags, dmu_replay_record_t *drr, zio_cksum_t *zc, 2336 char **top_zfs, int cleanup_fd, uint64_t *action_handlep) 2337{ 2338 nvlist_t *stream_nv = NULL; 2339 avl_tree_t *stream_avl = NULL; 2340 char *fromsnap = NULL; 2341 char *cp; 2342 char tofs[ZFS_MAXNAMELEN]; 2343 char sendfs[ZFS_MAXNAMELEN]; 2344 char errbuf[1024]; 2345 dmu_replay_record_t drre; 2346 int error; 2347 boolean_t anyerr = B_FALSE; 2348 boolean_t softerr = B_FALSE; 2349 boolean_t recursive; 2350 2351 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN, 2352 "cannot receive")); 2353 2354 assert(drr->drr_type == DRR_BEGIN); 2355 assert(drr->drr_u.drr_begin.drr_magic == DMU_BACKUP_MAGIC); 2356 assert(DMU_GET_STREAM_HDRTYPE(drr->drr_u.drr_begin.drr_versioninfo) == 2357 DMU_COMPOUNDSTREAM); 2358 2359 /* 2360 * Read in the nvlist from the stream. 2361 */ 2362 if (drr->drr_payloadlen != 0) { 2363 error = recv_read_nvlist(hdl, fd, drr->drr_payloadlen, 2364 &stream_nv, flags->byteswap, zc); 2365 if (error) { 2366 error = zfs_error(hdl, EZFS_BADSTREAM, errbuf); 2367 goto out; 2368 } 2369 } 2370 2371 recursive = (nvlist_lookup_boolean(stream_nv, "not_recursive") == 2372 ENOENT); 2373 2374 if (recursive && strchr(destname, '@')) { 2375 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 2376 "cannot specify snapshot name for multi-snapshot stream")); 2377 error = zfs_error(hdl, EZFS_BADSTREAM, errbuf); 2378 goto out; 2379 } 2380 2381 /* 2382 * Read in the end record and verify checksum. 2383 */ 2384 if (0 != (error = recv_read(hdl, fd, &drre, sizeof (drre), 2385 flags->byteswap, NULL))) 2386 goto out; 2387 if (flags->byteswap) { 2388 drre.drr_type = BSWAP_32(drre.drr_type); 2389 drre.drr_u.drr_end.drr_checksum.zc_word[0] = 2390 BSWAP_64(drre.drr_u.drr_end.drr_checksum.zc_word[0]); 2391 drre.drr_u.drr_end.drr_checksum.zc_word[1] = 2392 BSWAP_64(drre.drr_u.drr_end.drr_checksum.zc_word[1]); 2393 drre.drr_u.drr_end.drr_checksum.zc_word[2] = 2394 BSWAP_64(drre.drr_u.drr_end.drr_checksum.zc_word[2]); 2395 drre.drr_u.drr_end.drr_checksum.zc_word[3] = 2396 BSWAP_64(drre.drr_u.drr_end.drr_checksum.zc_word[3]); 2397 } 2398 if (drre.drr_type != DRR_END) { 2399 error = zfs_error(hdl, EZFS_BADSTREAM, errbuf); 2400 goto out; 2401 } 2402 if (!ZIO_CHECKSUM_EQUAL(drre.drr_u.drr_end.drr_checksum, *zc)) { 2403 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 2404 "incorrect header checksum")); 2405 error = zfs_error(hdl, EZFS_BADSTREAM, errbuf); 2406 goto out; 2407 } 2408 2409 (void) nvlist_lookup_string(stream_nv, "fromsnap", &fromsnap); 2410 2411 if (drr->drr_payloadlen != 0) { 2412 nvlist_t *stream_fss; 2413 2414 VERIFY(0 == nvlist_lookup_nvlist(stream_nv, "fss", 2415 &stream_fss)); 2416 if ((stream_avl = fsavl_create(stream_fss)) == NULL) { 2417 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 2418 "couldn't allocate avl tree")); 2419 error = zfs_error(hdl, EZFS_NOMEM, errbuf); 2420 goto out; 2421 } 2422 2423 if (fromsnap != NULL) { 2424 nvlist_t *renamed = NULL; 2425 nvpair_t *pair = NULL; 2426 2427 (void) strlcpy(tofs, destname, ZFS_MAXNAMELEN); 2428 if (flags->isprefix) { 2429 struct drr_begin *drrb = &drr->drr_u.drr_begin; 2430 int i; 2431 2432 if (flags->istail) { 2433 cp = strrchr(drrb->drr_toname, '/'); 2434 if (cp == NULL) { 2435 (void) strlcat(tofs, "/", 2436 ZFS_MAXNAMELEN); 2437 i = 0; 2438 } else { 2439 i = (cp - drrb->drr_toname); 2440 } 2441 } else { 2442 i = strcspn(drrb->drr_toname, "/@"); 2443 } 2444 /* zfs_receive_one() will create_parents() */ 2445 (void) strlcat(tofs, &drrb->drr_toname[i], 2446 ZFS_MAXNAMELEN); 2447 *strchr(tofs, '@') = '\0'; 2448 } 2449 2450 if (recursive && !flags->dryrun && !flags->nomount) { 2451 VERIFY(0 == nvlist_alloc(&renamed, 2452 NV_UNIQUE_NAME, 0)); 2453 } 2454 2455 softerr = recv_incremental_replication(hdl, tofs, flags, 2456 stream_nv, stream_avl, renamed); 2457 2458 /* Unmount renamed filesystems before receiving. */ 2459 while ((pair = nvlist_next_nvpair(renamed, 2460 pair)) != NULL) { 2461 zfs_handle_t *zhp; 2462 prop_changelist_t *clp = NULL; 2463 2464 zhp = zfs_open(hdl, nvpair_name(pair), 2465 ZFS_TYPE_FILESYSTEM); 2466 if (zhp != NULL) { 2467 clp = changelist_gather(zhp, 2468 ZFS_PROP_MOUNTPOINT, 0, 0); 2469 zfs_close(zhp); 2470 if (clp != NULL) { 2471 softerr |= 2472 changelist_prefix(clp); 2473 changelist_free(clp); 2474 } 2475 } 2476 } 2477 2478 nvlist_free(renamed); 2479 } 2480 } 2481 2482 /* 2483 * Get the fs specified by the first path in the stream (the top level 2484 * specified by 'zfs send') and pass it to each invocation of 2485 * zfs_receive_one(). 2486 */ 2487 (void) strlcpy(sendfs, drr->drr_u.drr_begin.drr_toname, 2488 ZFS_MAXNAMELEN); 2489 if ((cp = strchr(sendfs, '@')) != NULL) 2490 *cp = '\0'; 2491 2492 /* Finally, receive each contained stream */ 2493 do { 2494 /* 2495 * we should figure out if it has a recoverable 2496 * error, in which case do a recv_skip() and drive on. 2497 * Note, if we fail due to already having this guid, 2498 * zfs_receive_one() will take care of it (ie, 2499 * recv_skip() and return 0). 2500 */ 2501 error = zfs_receive_impl(hdl, destname, flags, fd, 2502 sendfs, stream_nv, stream_avl, top_zfs, cleanup_fd, 2503 action_handlep); 2504 if (error == ENODATA) { 2505 error = 0; 2506 break; 2507 } 2508 anyerr |= error; 2509 } while (error == 0); 2510 2511 if (drr->drr_payloadlen != 0 && fromsnap != NULL) { 2512 /* 2513 * Now that we have the fs's they sent us, try the 2514 * renames again. 2515 */ 2516 softerr = recv_incremental_replication(hdl, tofs, flags, 2517 stream_nv, stream_avl, NULL); 2518 } 2519 2520out: 2521 fsavl_destroy(stream_avl); 2522 if (stream_nv) 2523 nvlist_free(stream_nv); 2524 if (softerr) 2525 error = -2; 2526 if (anyerr) 2527 error = -1; 2528 return (error); 2529} 2530 2531static void 2532trunc_prop_errs(int truncated) 2533{ 2534 ASSERT(truncated != 0); 2535 2536 if (truncated == 1) 2537 (void) fprintf(stderr, dgettext(TEXT_DOMAIN, 2538 "1 more property could not be set\n")); 2539 else 2540 (void) fprintf(stderr, dgettext(TEXT_DOMAIN, 2541 "%d more properties could not be set\n"), truncated); 2542} 2543 2544static int 2545recv_skip(libzfs_handle_t *hdl, int fd, boolean_t byteswap) 2546{ 2547 dmu_replay_record_t *drr; 2548 void *buf = malloc(1<<20); 2549 char errbuf[1024]; 2550 2551 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN, 2552 "cannot receive:")); 2553 2554 /* XXX would be great to use lseek if possible... */ 2555 drr = buf; 2556 2557 while (recv_read(hdl, fd, drr, sizeof (dmu_replay_record_t), 2558 byteswap, NULL) == 0) { 2559 if (byteswap) 2560 drr->drr_type = BSWAP_32(drr->drr_type); 2561 2562 switch (drr->drr_type) { 2563 case DRR_BEGIN: 2564 /* NB: not to be used on v2 stream packages */ 2565 if (drr->drr_payloadlen != 0) { 2566 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 2567 "invalid substream header")); 2568 return (zfs_error(hdl, EZFS_BADSTREAM, errbuf)); 2569 } 2570 break; 2571 2572 case DRR_END: 2573 free(buf); 2574 return (0); 2575 2576 case DRR_OBJECT: 2577 if (byteswap) { 2578 drr->drr_u.drr_object.drr_bonuslen = 2579 BSWAP_32(drr->drr_u.drr_object. 2580 drr_bonuslen); 2581 } 2582 (void) recv_read(hdl, fd, buf, 2583 P2ROUNDUP(drr->drr_u.drr_object.drr_bonuslen, 8), 2584 B_FALSE, NULL); 2585 break; 2586 2587 case DRR_WRITE: 2588 if (byteswap) { 2589 drr->drr_u.drr_write.drr_length = 2590 BSWAP_64(drr->drr_u.drr_write.drr_length); 2591 } 2592 (void) recv_read(hdl, fd, buf, 2593 drr->drr_u.drr_write.drr_length, B_FALSE, NULL); 2594 break; 2595 case DRR_SPILL: 2596 if (byteswap) { 2597 drr->drr_u.drr_write.drr_length = 2598 BSWAP_64(drr->drr_u.drr_spill.drr_length); 2599 } 2600 (void) recv_read(hdl, fd, buf, 2601 drr->drr_u.drr_spill.drr_length, B_FALSE, NULL); 2602 break; 2603 case DRR_WRITE_EMBEDDED: 2604 if (byteswap) { 2605 drr->drr_u.drr_write_embedded.drr_psize = 2606 BSWAP_32(drr->drr_u.drr_write_embedded. 2607 drr_psize); 2608 } 2609 (void) recv_read(hdl, fd, buf, 2610 P2ROUNDUP(drr->drr_u.drr_write_embedded.drr_psize, 2611 8), B_FALSE, NULL); 2612 break; 2613 case DRR_WRITE_BYREF: 2614 case DRR_FREEOBJECTS: 2615 case DRR_FREE: 2616 break; 2617 2618 default: 2619 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 2620 "invalid record type")); 2621 return (zfs_error(hdl, EZFS_BADSTREAM, errbuf)); 2622 } 2623 } 2624 2625 free(buf); 2626 return (-1); 2627} 2628 2629/* 2630 * Restores a backup of tosnap from the file descriptor specified by infd. 2631 */ 2632static int 2633zfs_receive_one(libzfs_handle_t *hdl, int infd, const char *tosnap, 2634 recvflags_t *flags, dmu_replay_record_t *drr, 2635 dmu_replay_record_t *drr_noswap, const char *sendfs, 2636 nvlist_t *stream_nv, avl_tree_t *stream_avl, char **top_zfs, int cleanup_fd, 2637 uint64_t *action_handlep) 2638{ 2639 zfs_cmd_t zc = { 0 }; 2640 time_t begin_time; 2641 int ioctl_err, ioctl_errno, err; 2642 char *cp; 2643 struct drr_begin *drrb = &drr->drr_u.drr_begin; 2644 char errbuf[1024]; 2645 char prop_errbuf[1024]; 2646 const char *chopprefix; 2647 boolean_t newfs = B_FALSE; 2648 boolean_t stream_wantsnewfs; 2649 uint64_t parent_snapguid = 0; 2650 prop_changelist_t *clp = NULL; 2651 nvlist_t *snapprops_nvlist = NULL; 2652 zprop_errflags_t prop_errflags; 2653 boolean_t recursive; 2654 2655 begin_time = time(NULL); 2656 2657 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN, 2658 "cannot receive")); 2659 2660 recursive = (nvlist_lookup_boolean(stream_nv, "not_recursive") == 2661 ENOENT); 2662 2663 if (stream_avl != NULL) { 2664 char *snapname; 2665 nvlist_t *fs = fsavl_find(stream_avl, drrb->drr_toguid, 2666 &snapname); 2667 nvlist_t *props; 2668 int ret; 2669 2670 (void) nvlist_lookup_uint64(fs, "parentfromsnap", 2671 &parent_snapguid); 2672 err = nvlist_lookup_nvlist(fs, "props", &props); 2673 if (err) 2674 VERIFY(0 == nvlist_alloc(&props, NV_UNIQUE_NAME, 0)); 2675 2676 if (flags->canmountoff) { 2677 VERIFY(0 == nvlist_add_uint64(props, 2678 zfs_prop_to_name(ZFS_PROP_CANMOUNT), 0)); 2679 } 2680 ret = zcmd_write_src_nvlist(hdl, &zc, props); 2681 if (err) 2682 nvlist_free(props); 2683 2684 if (0 == nvlist_lookup_nvlist(fs, "snapprops", &props)) { 2685 VERIFY(0 == nvlist_lookup_nvlist(props, 2686 snapname, &snapprops_nvlist)); 2687 } 2688 2689 if (ret != 0) 2690 return (-1); 2691 } 2692 2693 cp = NULL; 2694 2695 /* 2696 * Determine how much of the snapshot name stored in the stream 2697 * we are going to tack on to the name they specified on the 2698 * command line, and how much we are going to chop off. 2699 * 2700 * If they specified a snapshot, chop the entire name stored in 2701 * the stream. 2702 */ 2703 if (flags->istail) { 2704 /* 2705 * A filesystem was specified with -e. We want to tack on only 2706 * the tail of the sent snapshot path. 2707 */ 2708 if (strchr(tosnap, '@')) { 2709 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "invalid " 2710 "argument - snapshot not allowed with -e")); 2711 return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf)); 2712 } 2713 2714 chopprefix = strrchr(sendfs, '/'); 2715 2716 if (chopprefix == NULL) { 2717 /* 2718 * The tail is the poolname, so we need to 2719 * prepend a path separator. 2720 */ 2721 int len = strlen(drrb->drr_toname); 2722 cp = malloc(len + 2); 2723 cp[0] = '/'; 2724 (void) strcpy(&cp[1], drrb->drr_toname); 2725 chopprefix = cp; 2726 } else { 2727 chopprefix = drrb->drr_toname + (chopprefix - sendfs); 2728 } 2729 } else if (flags->isprefix) { 2730 /* 2731 * A filesystem was specified with -d. We want to tack on 2732 * everything but the first element of the sent snapshot path 2733 * (all but the pool name). 2734 */ 2735 if (strchr(tosnap, '@')) { 2736 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "invalid " 2737 "argument - snapshot not allowed with -d")); 2738 return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf)); 2739 } 2740 2741 chopprefix = strchr(drrb->drr_toname, '/'); 2742 if (chopprefix == NULL) 2743 chopprefix = strchr(drrb->drr_toname, '@'); 2744 } else if (strchr(tosnap, '@') == NULL) { 2745 /* 2746 * If a filesystem was specified without -d or -e, we want to 2747 * tack on everything after the fs specified by 'zfs send'. 2748 */ 2749 chopprefix = drrb->drr_toname + strlen(sendfs); 2750 } else { 2751 /* A snapshot was specified as an exact path (no -d or -e). */ 2752 if (recursive) { 2753 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 2754 "cannot specify snapshot name for multi-snapshot " 2755 "stream")); 2756 return (zfs_error(hdl, EZFS_BADSTREAM, errbuf)); 2757 } 2758 chopprefix = drrb->drr_toname + strlen(drrb->drr_toname); 2759 } 2760 2761 ASSERT(strstr(drrb->drr_toname, sendfs) == drrb->drr_toname); 2762 ASSERT(chopprefix > drrb->drr_toname); 2763 ASSERT(chopprefix <= drrb->drr_toname + strlen(drrb->drr_toname)); 2764 ASSERT(chopprefix[0] == '/' || chopprefix[0] == '@' || 2765 chopprefix[0] == '\0'); 2766 2767 /* 2768 * Determine name of destination snapshot, store in zc_value. 2769 */ 2770 (void) strcpy(zc.zc_value, tosnap); 2771 (void) strncat(zc.zc_value, chopprefix, sizeof (zc.zc_value)); 2772#ifdef __FreeBSD__ 2773 if (zfs_ioctl_version == ZFS_IOCVER_UNDEF) 2774 zfs_ioctl_version = get_zfs_ioctl_version(); 2775 /* 2776 * For forward compatibility hide tosnap in zc_value 2777 */ 2778 if (zfs_ioctl_version < ZFS_IOCVER_LZC) 2779 (void) strcpy(zc.zc_value + strlen(zc.zc_value) + 1, tosnap); 2780#endif 2781 free(cp); 2782 if (!zfs_name_valid(zc.zc_value, ZFS_TYPE_SNAPSHOT)) { 2783 zcmd_free_nvlists(&zc); 2784 return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf)); 2785 } 2786 2787 /* 2788 * Determine the name of the origin snapshot, store in zc_string. 2789 */ 2790 if (drrb->drr_flags & DRR_FLAG_CLONE) { 2791 if (guid_to_name(hdl, zc.zc_value, 2792 drrb->drr_fromguid, zc.zc_string) != 0) { 2793 zcmd_free_nvlists(&zc); 2794 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 2795 "local origin for clone %s does not exist"), 2796 zc.zc_value); 2797 return (zfs_error(hdl, EZFS_NOENT, errbuf)); 2798 } 2799 if (flags->verbose) 2800 (void) printf("found clone origin %s\n", zc.zc_string); 2801 } 2802 2803 stream_wantsnewfs = (drrb->drr_fromguid == 0 || 2804 (drrb->drr_flags & DRR_FLAG_CLONE)); 2805 2806 if (stream_wantsnewfs) { 2807 /* 2808 * if the parent fs does not exist, look for it based on 2809 * the parent snap GUID 2810 */ 2811 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN, 2812 "cannot receive new filesystem stream")); 2813 2814 (void) strcpy(zc.zc_name, zc.zc_value); 2815 cp = strrchr(zc.zc_name, '/'); 2816 if (cp) 2817 *cp = '\0'; 2818 if (cp && 2819 !zfs_dataset_exists(hdl, zc.zc_name, ZFS_TYPE_DATASET)) { 2820 char suffix[ZFS_MAXNAMELEN]; 2821 (void) strcpy(suffix, strrchr(zc.zc_value, '/')); 2822 if (guid_to_name(hdl, zc.zc_name, parent_snapguid, 2823 zc.zc_value) == 0) { 2824 *strchr(zc.zc_value, '@') = '\0'; 2825 (void) strcat(zc.zc_value, suffix); 2826 } 2827 } 2828 } else { 2829 /* 2830 * if the fs does not exist, look for it based on the 2831 * fromsnap GUID 2832 */ 2833 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN, 2834 "cannot receive incremental stream")); 2835 2836 (void) strcpy(zc.zc_name, zc.zc_value); 2837 *strchr(zc.zc_name, '@') = '\0'; 2838 2839 /* 2840 * If the exact receive path was specified and this is the 2841 * topmost path in the stream, then if the fs does not exist we 2842 * should look no further. 2843 */ 2844 if ((flags->isprefix || (*(chopprefix = drrb->drr_toname + 2845 strlen(sendfs)) != '\0' && *chopprefix != '@')) && 2846 !zfs_dataset_exists(hdl, zc.zc_name, ZFS_TYPE_DATASET)) { 2847 char snap[ZFS_MAXNAMELEN]; 2848 (void) strcpy(snap, strchr(zc.zc_value, '@')); 2849 if (guid_to_name(hdl, zc.zc_name, drrb->drr_fromguid, 2850 zc.zc_value) == 0) { 2851 *strchr(zc.zc_value, '@') = '\0'; 2852 (void) strcat(zc.zc_value, snap); 2853 } 2854 } 2855 } 2856 2857 (void) strcpy(zc.zc_name, zc.zc_value); 2858 *strchr(zc.zc_name, '@') = '\0'; 2859 2860 if (zfs_dataset_exists(hdl, zc.zc_name, ZFS_TYPE_DATASET)) { 2861 zfs_handle_t *zhp; 2862 2863 /* 2864 * Destination fs exists. Therefore this should either 2865 * be an incremental, or the stream specifies a new fs 2866 * (full stream or clone) and they want us to blow it 2867 * away (and have therefore specified -F and removed any 2868 * snapshots). 2869 */ 2870 if (stream_wantsnewfs) { 2871 if (!flags->force) { 2872 zcmd_free_nvlists(&zc); 2873 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 2874 "destination '%s' exists\n" 2875 "must specify -F to overwrite it"), 2876 zc.zc_name); 2877 return (zfs_error(hdl, EZFS_EXISTS, errbuf)); 2878 } 2879 if (ioctl(hdl->libzfs_fd, ZFS_IOC_SNAPSHOT_LIST_NEXT, 2880 &zc) == 0) { 2881 zcmd_free_nvlists(&zc); 2882 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 2883 "destination has snapshots (eg. %s)\n" 2884 "must destroy them to overwrite it"), 2885 zc.zc_name); 2886 return (zfs_error(hdl, EZFS_EXISTS, errbuf)); 2887 } 2888 } 2889 2890 if ((zhp = zfs_open(hdl, zc.zc_name, 2891 ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME)) == NULL) { 2892 zcmd_free_nvlists(&zc); 2893 return (-1); 2894 } 2895 2896 if (stream_wantsnewfs && 2897 zhp->zfs_dmustats.dds_origin[0]) { 2898 zcmd_free_nvlists(&zc); 2899 zfs_close(zhp); 2900 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 2901 "destination '%s' is a clone\n" 2902 "must destroy it to overwrite it"), 2903 zc.zc_name); 2904 return (zfs_error(hdl, EZFS_EXISTS, errbuf)); 2905 } 2906 2907 if (!flags->dryrun && zhp->zfs_type == ZFS_TYPE_FILESYSTEM && 2908 stream_wantsnewfs) { 2909 /* We can't do online recv in this case */ 2910 clp = changelist_gather(zhp, ZFS_PROP_NAME, 0, 0); 2911 if (clp == NULL) { 2912 zfs_close(zhp); 2913 zcmd_free_nvlists(&zc); 2914 return (-1); 2915 } 2916 if (changelist_prefix(clp) != 0) { 2917 changelist_free(clp); 2918 zfs_close(zhp); 2919 zcmd_free_nvlists(&zc); 2920 return (-1); 2921 } 2922 } 2923 zfs_close(zhp); 2924 } else { 2925 /* 2926 * Destination filesystem does not exist. Therefore we better 2927 * be creating a new filesystem (either from a full backup, or 2928 * a clone). It would therefore be invalid if the user 2929 * specified only the pool name (i.e. if the destination name 2930 * contained no slash character). 2931 */ 2932 if (!stream_wantsnewfs || 2933 (cp = strrchr(zc.zc_name, '/')) == NULL) { 2934 zcmd_free_nvlists(&zc); 2935 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 2936 "destination '%s' does not exist"), zc.zc_name); 2937 return (zfs_error(hdl, EZFS_NOENT, errbuf)); 2938 } 2939 2940 /* 2941 * Trim off the final dataset component so we perform the 2942 * recvbackup ioctl to the filesystems's parent. 2943 */ 2944 *cp = '\0'; 2945 2946 if (flags->isprefix && !flags->istail && !flags->dryrun && 2947 create_parents(hdl, zc.zc_value, strlen(tosnap)) != 0) { 2948 zcmd_free_nvlists(&zc); 2949 return (zfs_error(hdl, EZFS_BADRESTORE, errbuf)); 2950 } 2951 2952 newfs = B_TRUE; 2953 } 2954 2955 zc.zc_begin_record = drr_noswap->drr_u.drr_begin; 2956 zc.zc_cookie = infd; 2957 zc.zc_guid = flags->force; 2958 if (flags->verbose) { 2959 (void) printf("%s %s stream of %s into %s\n", 2960 flags->dryrun ? "would receive" : "receiving", 2961 drrb->drr_fromguid ? "incremental" : "full", 2962 drrb->drr_toname, zc.zc_value); 2963 (void) fflush(stdout); 2964 } 2965 2966 if (flags->dryrun) { 2967 zcmd_free_nvlists(&zc); 2968 return (recv_skip(hdl, infd, flags->byteswap)); 2969 } 2970 2971 zc.zc_nvlist_dst = (uint64_t)(uintptr_t)prop_errbuf; 2972 zc.zc_nvlist_dst_size = sizeof (prop_errbuf); 2973 zc.zc_cleanup_fd = cleanup_fd; 2974 zc.zc_action_handle = *action_handlep; 2975 2976 err = ioctl_err = zfs_ioctl(hdl, ZFS_IOC_RECV, &zc); 2977 ioctl_errno = errno; 2978 prop_errflags = (zprop_errflags_t)zc.zc_obj; 2979 2980 if (err == 0) { 2981 nvlist_t *prop_errors; 2982 VERIFY(0 == nvlist_unpack((void *)(uintptr_t)zc.zc_nvlist_dst, 2983 zc.zc_nvlist_dst_size, &prop_errors, 0)); 2984 2985 nvpair_t *prop_err = NULL; 2986 2987 while ((prop_err = nvlist_next_nvpair(prop_errors, 2988 prop_err)) != NULL) { 2989 char tbuf[1024]; 2990 zfs_prop_t prop; 2991 int intval; 2992 2993 prop = zfs_name_to_prop(nvpair_name(prop_err)); 2994 (void) nvpair_value_int32(prop_err, &intval); 2995 if (strcmp(nvpair_name(prop_err), 2996 ZPROP_N_MORE_ERRORS) == 0) { 2997 trunc_prop_errs(intval); 2998 break; 2999 } else { 3000 (void) snprintf(tbuf, sizeof (tbuf), 3001 dgettext(TEXT_DOMAIN, 3002 "cannot receive %s property on %s"), 3003 nvpair_name(prop_err), zc.zc_name); 3004 zfs_setprop_error(hdl, prop, intval, tbuf); 3005 } 3006 } 3007 nvlist_free(prop_errors); 3008 } 3009 3010 zc.zc_nvlist_dst = 0; 3011 zc.zc_nvlist_dst_size = 0; 3012 zcmd_free_nvlists(&zc); 3013 3014 if (err == 0 && snapprops_nvlist) { 3015 zfs_cmd_t zc2 = { 0 }; 3016 3017 (void) strcpy(zc2.zc_name, zc.zc_value); 3018 zc2.zc_cookie = B_TRUE; /* received */ 3019 if (zcmd_write_src_nvlist(hdl, &zc2, snapprops_nvlist) == 0) { 3020 (void) zfs_ioctl(hdl, ZFS_IOC_SET_PROP, &zc2); 3021 zcmd_free_nvlists(&zc2); 3022 } 3023 } 3024 3025 if (err && (ioctl_errno == ENOENT || ioctl_errno == EEXIST)) { 3026 /* 3027 * It may be that this snapshot already exists, 3028 * in which case we want to consume & ignore it 3029 * rather than failing. 3030 */ 3031 avl_tree_t *local_avl; 3032 nvlist_t *local_nv, *fs; 3033 cp = strchr(zc.zc_value, '@'); 3034 3035 /* 3036 * XXX Do this faster by just iterating over snaps in 3037 * this fs. Also if zc_value does not exist, we will 3038 * get a strange "does not exist" error message. 3039 */ 3040 *cp = '\0'; 3041 if (gather_nvlist(hdl, zc.zc_value, NULL, NULL, B_FALSE, 3042 &local_nv, &local_avl) == 0) { 3043 *cp = '@'; 3044 fs = fsavl_find(local_avl, drrb->drr_toguid, NULL); 3045 fsavl_destroy(local_avl); 3046 nvlist_free(local_nv); 3047 3048 if (fs != NULL) { 3049 if (flags->verbose) { 3050 (void) printf("snap %s already exists; " 3051 "ignoring\n", zc.zc_value); 3052 } 3053 err = ioctl_err = recv_skip(hdl, infd, 3054 flags->byteswap); 3055 } 3056 } 3057 *cp = '@'; 3058 } 3059 3060 if (ioctl_err != 0) { 3061 switch (ioctl_errno) { 3062 case ENODEV: 3063 cp = strchr(zc.zc_value, '@'); 3064 *cp = '\0'; 3065 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 3066 "most recent snapshot of %s does not\n" 3067 "match incremental source"), zc.zc_value); 3068 (void) zfs_error(hdl, EZFS_BADRESTORE, errbuf); 3069 *cp = '@'; 3070 break; 3071 case ETXTBSY: 3072 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 3073 "destination %s has been modified\n" 3074 "since most recent snapshot"), zc.zc_name); 3075 (void) zfs_error(hdl, EZFS_BADRESTORE, errbuf); 3076 break; 3077 case EEXIST: 3078 cp = strchr(zc.zc_value, '@'); 3079 if (newfs) { 3080 /* it's the containing fs that exists */ 3081 *cp = '\0'; 3082 } 3083 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 3084 "destination already exists")); 3085 (void) zfs_error_fmt(hdl, EZFS_EXISTS, 3086 dgettext(TEXT_DOMAIN, "cannot restore to %s"), 3087 zc.zc_value); 3088 *cp = '@'; 3089 break; 3090 case EINVAL: 3091 (void) zfs_error(hdl, EZFS_BADSTREAM, errbuf); 3092 break; 3093 case ECKSUM: 3094 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 3095 "invalid stream (checksum mismatch)")); 3096 (void) zfs_error(hdl, EZFS_BADSTREAM, errbuf); 3097 break; 3098 case ENOTSUP: 3099 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 3100 "pool must be upgraded to receive this stream.")); 3101 (void) zfs_error(hdl, EZFS_BADVERSION, errbuf); 3102 break; 3103 case EDQUOT: 3104 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 3105 "destination %s space quota exceeded"), zc.zc_name); 3106 (void) zfs_error(hdl, EZFS_NOSPC, errbuf); 3107 break; 3108 default: 3109 (void) zfs_standard_error(hdl, ioctl_errno, errbuf); 3110 } 3111 } 3112 3113 /* 3114 * Mount the target filesystem (if created). Also mount any 3115 * children of the target filesystem if we did a replication 3116 * receive (indicated by stream_avl being non-NULL). 3117 */ 3118 cp = strchr(zc.zc_value, '@'); 3119 if (cp && (ioctl_err == 0 || !newfs)) { 3120 zfs_handle_t *h; 3121 3122 *cp = '\0'; 3123 h = zfs_open(hdl, zc.zc_value, 3124 ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME); 3125 if (h != NULL) { 3126 if (h->zfs_type == ZFS_TYPE_VOLUME) { 3127 *cp = '@'; 3128 } else if (newfs || stream_avl) { 3129 /* 3130 * Track the first/top of hierarchy fs, 3131 * for mounting and sharing later. 3132 */ 3133 if (top_zfs && *top_zfs == NULL) 3134 *top_zfs = zfs_strdup(hdl, zc.zc_value); 3135 } 3136 zfs_close(h); 3137 } 3138 *cp = '@'; 3139 } 3140 3141 if (clp) { 3142 err |= changelist_postfix(clp); 3143 changelist_free(clp); 3144 } 3145 3146 if (prop_errflags & ZPROP_ERR_NOCLEAR) { 3147 (void) fprintf(stderr, dgettext(TEXT_DOMAIN, "Warning: " 3148 "failed to clear unreceived properties on %s"), 3149 zc.zc_name); 3150 (void) fprintf(stderr, "\n"); 3151 } 3152 if (prop_errflags & ZPROP_ERR_NORESTORE) { 3153 (void) fprintf(stderr, dgettext(TEXT_DOMAIN, "Warning: " 3154 "failed to restore original properties on %s"), 3155 zc.zc_name); 3156 (void) fprintf(stderr, "\n"); 3157 } 3158 3159 if (err || ioctl_err) 3160 return (-1); 3161 3162 *action_handlep = zc.zc_action_handle; 3163 3164 if (flags->verbose) { 3165 char buf1[64]; 3166 char buf2[64]; 3167 uint64_t bytes = zc.zc_cookie; 3168 time_t delta = time(NULL) - begin_time; 3169 if (delta == 0) 3170 delta = 1; 3171 zfs_nicenum(bytes, buf1, sizeof (buf1)); 3172 zfs_nicenum(bytes/delta, buf2, sizeof (buf1)); 3173 3174 (void) printf("received %sB stream in %lu seconds (%sB/sec)\n", 3175 buf1, delta, buf2); 3176 } 3177 3178 return (0); 3179} 3180 3181static int 3182zfs_receive_impl(libzfs_handle_t *hdl, const char *tosnap, recvflags_t *flags, 3183 int infd, const char *sendfs, nvlist_t *stream_nv, avl_tree_t *stream_avl, 3184 char **top_zfs, int cleanup_fd, uint64_t *action_handlep) 3185{ 3186 int err; 3187 dmu_replay_record_t drr, drr_noswap; 3188 struct drr_begin *drrb = &drr.drr_u.drr_begin; 3189 char errbuf[1024]; 3190 zio_cksum_t zcksum = { 0 }; 3191 uint64_t featureflags; 3192 int hdrtype; 3193 3194 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN, 3195 "cannot receive")); 3196 3197 if (flags->isprefix && 3198 !zfs_dataset_exists(hdl, tosnap, ZFS_TYPE_DATASET)) { 3199 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "specified fs " 3200 "(%s) does not exist"), tosnap); 3201 return (zfs_error(hdl, EZFS_NOENT, errbuf)); 3202 } 3203 3204 /* read in the BEGIN record */ 3205 if (0 != (err = recv_read(hdl, infd, &drr, sizeof (drr), B_FALSE, 3206 &zcksum))) 3207 return (err); 3208 3209 if (drr.drr_type == DRR_END || drr.drr_type == BSWAP_32(DRR_END)) { 3210 /* It's the double end record at the end of a package */ 3211 return (ENODATA); 3212 } 3213 3214 /* the kernel needs the non-byteswapped begin record */ 3215 drr_noswap = drr; 3216 3217 flags->byteswap = B_FALSE; 3218 if (drrb->drr_magic == BSWAP_64(DMU_BACKUP_MAGIC)) { 3219 /* 3220 * We computed the checksum in the wrong byteorder in 3221 * recv_read() above; do it again correctly. 3222 */ 3223 bzero(&zcksum, sizeof (zio_cksum_t)); 3224 fletcher_4_incremental_byteswap(&drr, sizeof (drr), &zcksum); 3225 flags->byteswap = B_TRUE; 3226 3227 drr.drr_type = BSWAP_32(drr.drr_type); 3228 drr.drr_payloadlen = BSWAP_32(drr.drr_payloadlen); 3229 drrb->drr_magic = BSWAP_64(drrb->drr_magic); 3230 drrb->drr_versioninfo = BSWAP_64(drrb->drr_versioninfo); 3231 drrb->drr_creation_time = BSWAP_64(drrb->drr_creation_time); 3232 drrb->drr_type = BSWAP_32(drrb->drr_type); 3233 drrb->drr_flags = BSWAP_32(drrb->drr_flags); 3234 drrb->drr_toguid = BSWAP_64(drrb->drr_toguid); 3235 drrb->drr_fromguid = BSWAP_64(drrb->drr_fromguid); 3236 } 3237 3238 if (drrb->drr_magic != DMU_BACKUP_MAGIC || drr.drr_type != DRR_BEGIN) { 3239 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "invalid " 3240 "stream (bad magic number)")); 3241 return (zfs_error(hdl, EZFS_BADSTREAM, errbuf)); 3242 } 3243 3244 featureflags = DMU_GET_FEATUREFLAGS(drrb->drr_versioninfo); 3245 hdrtype = DMU_GET_STREAM_HDRTYPE(drrb->drr_versioninfo); 3246 3247 if (!DMU_STREAM_SUPPORTED(featureflags) || 3248 (hdrtype != DMU_SUBSTREAM && hdrtype != DMU_COMPOUNDSTREAM)) { 3249 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, 3250 "stream has unsupported feature, feature flags = %lx"), 3251 featureflags); 3252 return (zfs_error(hdl, EZFS_BADSTREAM, errbuf)); 3253 } 3254 3255 if (strchr(drrb->drr_toname, '@') == NULL) { 3256 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "invalid " 3257 "stream (bad snapshot name)")); 3258 return (zfs_error(hdl, EZFS_BADSTREAM, errbuf)); 3259 } 3260 3261 if (DMU_GET_STREAM_HDRTYPE(drrb->drr_versioninfo) == DMU_SUBSTREAM) { 3262 char nonpackage_sendfs[ZFS_MAXNAMELEN]; 3263 if (sendfs == NULL) { 3264 /* 3265 * We were not called from zfs_receive_package(). Get 3266 * the fs specified by 'zfs send'. 3267 */ 3268 char *cp; 3269 (void) strlcpy(nonpackage_sendfs, 3270 drr.drr_u.drr_begin.drr_toname, ZFS_MAXNAMELEN); 3271 if ((cp = strchr(nonpackage_sendfs, '@')) != NULL) 3272 *cp = '\0'; 3273 sendfs = nonpackage_sendfs; 3274 } 3275 return (zfs_receive_one(hdl, infd, tosnap, flags, 3276 &drr, &drr_noswap, sendfs, stream_nv, stream_avl, 3277 top_zfs, cleanup_fd, action_handlep)); 3278 } else { 3279 assert(DMU_GET_STREAM_HDRTYPE(drrb->drr_versioninfo) == 3280 DMU_COMPOUNDSTREAM); 3281 return (zfs_receive_package(hdl, infd, tosnap, flags, 3282 &drr, &zcksum, top_zfs, cleanup_fd, action_handlep)); 3283 } 3284} 3285 3286/* 3287 * Restores a backup of tosnap from the file descriptor specified by infd. 3288 * Return 0 on total success, -2 if some things couldn't be 3289 * destroyed/renamed/promoted, -1 if some things couldn't be received. 3290 * (-1 will override -2). 3291 */ 3292int 3293zfs_receive(libzfs_handle_t *hdl, const char *tosnap, recvflags_t *flags, 3294 int infd, avl_tree_t *stream_avl) 3295{ 3296 char *top_zfs = NULL; 3297 int err; 3298 int cleanup_fd; 3299 uint64_t action_handle = 0; 3300 3301 cleanup_fd = open(ZFS_DEV, O_RDWR|O_EXCL); 3302 VERIFY(cleanup_fd >= 0); 3303 3304 err = zfs_receive_impl(hdl, tosnap, flags, infd, NULL, NULL, 3305 stream_avl, &top_zfs, cleanup_fd, &action_handle); 3306 3307 VERIFY(0 == close(cleanup_fd)); 3308 3309 if (err == 0 && !flags->nomount && top_zfs) { 3310 zfs_handle_t *zhp; 3311 prop_changelist_t *clp; 3312 3313 zhp = zfs_open(hdl, top_zfs, ZFS_TYPE_FILESYSTEM); 3314 if (zhp != NULL) { 3315 clp = changelist_gather(zhp, ZFS_PROP_MOUNTPOINT, 3316 CL_GATHER_MOUNT_ALWAYS, 0); 3317 zfs_close(zhp); 3318 if (clp != NULL) { 3319 /* mount and share received datasets */ 3320 err = changelist_postfix(clp); 3321 changelist_free(clp); 3322 } 3323 } 3324 if (zhp == NULL || clp == NULL || err) 3325 err = -1; 3326 } 3327 if (top_zfs) 3328 free(top_zfs); 3329 3330 return (err); 3331} 3332