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) 2013 Steven Hartland. All rights reserved.
27 * Copyright 2015, OmniTI Computer Consulting, Inc. All rights reserved.
28 */
29
30 #include <assert.h>
31 #include <ctype.h>
32 #include <errno.h>
33 #include <libintl.h>
34 #include <stdio.h>
35 #include <stdlib.h>
36 #include <strings.h>
37 #include <unistd.h>
38 #include <stddef.h>
39 #include <fcntl.h>
40 #include <sys/mount.h>
41 #include <pthread.h>
42 #include <umem.h>
43 #include <time.h>
44
45 #include <libzfs.h>
46 #include <libzfs_core.h>
47
48 #include "zfs_namecheck.h"
49 #include "zfs_prop.h"
50 #include "zfs_fletcher.h"
51 #include "libzfs_impl.h"
52 #include <sha2.h>
53 #include <sys/zio_checksum.h>
54 #include <sys/ddt.h>
55
56 /* in libzfs_dataset.c */
57 extern void zfs_setprop_error(libzfs_handle_t *, zfs_prop_t, int, char *);
58
59 static int zfs_receive_impl(libzfs_handle_t *, const char *, recvflags_t *,
60 int, const char *, nvlist_t *, avl_tree_t *, char **, int, uint64_t *,
61 const char *);
62
63 static const zio_cksum_t zero_cksum = { 0 };
64
65 typedef struct dedup_arg {
66 int inputfd;
67 int outputfd;
68 libzfs_handle_t *dedup_hdl;
69 } dedup_arg_t;
70
71 typedef struct progress_arg {
72 zfs_handle_t *pa_zhp;
73 int pa_fd;
74 boolean_t pa_parsable;
75 } progress_arg_t;
76
77 typedef struct dataref {
78 uint64_t ref_guid;
79 uint64_t ref_object;
80 uint64_t ref_offset;
81 } dataref_t;
82
83 typedef struct dedup_entry {
84 struct dedup_entry *dde_next;
85 zio_cksum_t dde_chksum;
86 uint64_t dde_prop;
87 dataref_t dde_ref;
88 } dedup_entry_t;
89
90 #define MAX_DDT_PHYSMEM_PERCENT 20
91 #define SMALLEST_POSSIBLE_MAX_DDT_MB 128
92
93 typedef struct dedup_table {
94 dedup_entry_t **dedup_hash_array;
95 umem_cache_t *ddecache;
96 uint64_t max_ddt_size; /* max dedup table size in bytes */
97 uint64_t cur_ddt_size; /* current dedup table size in bytes */
98 uint64_t ddt_count;
99 int numhashbits;
100 boolean_t ddt_full;
101 } dedup_table_t;
102
103 static int
104 high_order_bit(uint64_t n)
105 {
106 int count;
107
108 for (count = 0; n != 0; count++)
109 n >>= 1;
110 return (count);
111 }
112
113 static size_t
114 ssread(void *buf, size_t len, FILE *stream)
115 {
116 size_t outlen;
117
118 if ((outlen = fread(buf, len, 1, stream)) == 0)
119 return (0);
120
121 return (outlen);
122 }
123
124 static void
125 ddt_hash_append(libzfs_handle_t *hdl, dedup_table_t *ddt, dedup_entry_t **ddepp,
126 zio_cksum_t *cs, uint64_t prop, dataref_t *dr)
127 {
128 dedup_entry_t *dde;
129
130 if (ddt->cur_ddt_size >= ddt->max_ddt_size) {
131 if (ddt->ddt_full == B_FALSE) {
132 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
133 "Dedup table full. Deduplication will continue "
134 "with existing table entries"));
135 ddt->ddt_full = B_TRUE;
136 }
137 return;
138 }
139
140 if ((dde = umem_cache_alloc(ddt->ddecache, UMEM_DEFAULT))
141 != NULL) {
142 assert(*ddepp == NULL);
143 dde->dde_next = NULL;
144 dde->dde_chksum = *cs;
145 dde->dde_prop = prop;
146 dde->dde_ref = *dr;
147 *ddepp = dde;
148 ddt->cur_ddt_size += sizeof (dedup_entry_t);
149 ddt->ddt_count++;
150 }
151 }
152
153 /*
154 * Using the specified dedup table, do a lookup for an entry with
155 * the checksum cs. If found, return the block's reference info
156 * in *dr. Otherwise, insert a new entry in the dedup table, using
157 * the reference information specified by *dr.
158 *
159 * return value: true - entry was found
160 * false - entry was not found
161 */
162 static boolean_t
163 ddt_update(libzfs_handle_t *hdl, dedup_table_t *ddt, zio_cksum_t *cs,
164 uint64_t prop, dataref_t *dr)
165 {
166 uint32_t hashcode;
167 dedup_entry_t **ddepp;
168
169 hashcode = BF64_GET(cs->zc_word[0], 0, ddt->numhashbits);
170
171 for (ddepp = &(ddt->dedup_hash_array[hashcode]); *ddepp != NULL;
172 ddepp = &((*ddepp)->dde_next)) {
173 if (ZIO_CHECKSUM_EQUAL(((*ddepp)->dde_chksum), *cs) &&
174 (*ddepp)->dde_prop == prop) {
175 *dr = (*ddepp)->dde_ref;
176 return (B_TRUE);
177 }
178 }
179 ddt_hash_append(hdl, ddt, ddepp, cs, prop, dr);
180 return (B_FALSE);
181 }
182
183 static int
184 dump_record(dmu_replay_record_t *drr, void *payload, int payload_len,
185 zio_cksum_t *zc, int outfd)
186 {
187 ASSERT3U(offsetof(dmu_replay_record_t, drr_u.drr_checksum.drr_checksum),
188 ==, sizeof (dmu_replay_record_t) - sizeof (zio_cksum_t));
189 fletcher_4_incremental_native(drr,
190 offsetof(dmu_replay_record_t, drr_u.drr_checksum.drr_checksum), zc);
191 if (drr->drr_type != DRR_BEGIN) {
192 ASSERT(ZIO_CHECKSUM_IS_ZERO(&drr->drr_u.
193 drr_checksum.drr_checksum));
194 drr->drr_u.drr_checksum.drr_checksum = *zc;
195 }
196 fletcher_4_incremental_native(&drr->drr_u.drr_checksum.drr_checksum,
197 sizeof (zio_cksum_t), zc);
198 if (write(outfd, drr, sizeof (*drr)) == -1)
199 return (errno);
200 if (payload_len != 0) {
201 fletcher_4_incremental_native(payload, payload_len, zc);
202 if (write(outfd, payload, payload_len) == -1)
203 return (errno);
204 }
205 return (0);
206 }
207
208 /*
209 * This function is started in a separate thread when the dedup option
210 * has been requested. The main send thread determines the list of
211 * snapshots to be included in the send stream and makes the ioctl calls
212 * for each one. But instead of having the ioctl send the output to the
213 * the output fd specified by the caller of zfs_send()), the
214 * ioctl is told to direct the output to a pipe, which is read by the
215 * alternate thread running THIS function. This function does the
216 * dedup'ing by:
217 * 1. building a dedup table (the DDT)
218 * 2. doing checksums on each data block and inserting a record in the DDT
219 * 3. looking for matching checksums, and
220 * 4. sending a DRR_WRITE_BYREF record instead of a write record whenever
221 * a duplicate block is found.
222 * The output of this function then goes to the output fd requested
223 * by the caller of zfs_send().
224 */
225 static void *
226 cksummer(void *arg)
227 {
228 dedup_arg_t *dda = arg;
229 char *buf = zfs_alloc(dda->dedup_hdl, SPA_MAXBLOCKSIZE);
230 dmu_replay_record_t thedrr;
231 dmu_replay_record_t *drr = &thedrr;
232 FILE *ofp;
233 int outfd;
234 dedup_table_t ddt;
235 zio_cksum_t stream_cksum;
236 uint64_t physmem = sysconf(_SC_PHYS_PAGES) * sysconf(_SC_PAGESIZE);
237 uint64_t numbuckets;
238
239 ddt.max_ddt_size =
240 MAX((physmem * MAX_DDT_PHYSMEM_PERCENT) / 100,
241 SMALLEST_POSSIBLE_MAX_DDT_MB << 20);
242
243 numbuckets = ddt.max_ddt_size / (sizeof (dedup_entry_t));
244
245 /*
246 * numbuckets must be a power of 2. Increase number to
247 * a power of 2 if necessary.
248 */
249 if (!ISP2(numbuckets))
250 numbuckets = 1 << high_order_bit(numbuckets);
251
252 ddt.dedup_hash_array = calloc(numbuckets, sizeof (dedup_entry_t *));
253 ddt.ddecache = umem_cache_create("dde", sizeof (dedup_entry_t), 0,
254 NULL, NULL, NULL, NULL, NULL, 0);
255 ddt.cur_ddt_size = numbuckets * sizeof (dedup_entry_t *);
256 ddt.numhashbits = high_order_bit(numbuckets) - 1;
257 ddt.ddt_full = B_FALSE;
258
259 outfd = dda->outputfd;
260 ofp = fdopen(dda->inputfd, "r");
261 while (ssread(drr, sizeof (*drr), ofp) != 0) {
262
263 switch (drr->drr_type) {
264 case DRR_BEGIN:
265 {
266 struct drr_begin *drrb = &drr->drr_u.drr_begin;
267 int fflags;
268 int sz = 0;
269 ZIO_SET_CHECKSUM(&stream_cksum, 0, 0, 0, 0);
270
271 ASSERT3U(drrb->drr_magic, ==, DMU_BACKUP_MAGIC);
272
273 /* set the DEDUP feature flag for this stream */
274 fflags = DMU_GET_FEATUREFLAGS(drrb->drr_versioninfo);
275 fflags |= (DMU_BACKUP_FEATURE_DEDUP |
276 DMU_BACKUP_FEATURE_DEDUPPROPS);
277 DMU_SET_FEATUREFLAGS(drrb->drr_versioninfo, fflags);
278
279 if (DMU_GET_STREAM_HDRTYPE(drrb->drr_versioninfo) ==
280 DMU_COMPOUNDSTREAM && drr->drr_payloadlen != 0) {
281 sz = drr->drr_payloadlen;
282
283 if (sz > SPA_MAXBLOCKSIZE) {
284 buf = zfs_realloc(dda->dedup_hdl, buf,
285 SPA_MAXBLOCKSIZE, sz);
286 }
287 (void) ssread(buf, sz, ofp);
288 if (ferror(stdin))
289 perror("fread");
290 }
291 if (dump_record(drr, buf, sz, &stream_cksum,
292 outfd) != 0)
293 goto out;
294 break;
295 }
296
297 case DRR_END:
298 {
299 struct drr_end *drre = &drr->drr_u.drr_end;
300 /* use the recalculated checksum */
301 drre->drr_checksum = stream_cksum;
302 if (dump_record(drr, NULL, 0, &stream_cksum,
303 outfd) != 0)
304 goto out;
305 break;
306 }
307
308 case DRR_OBJECT:
309 {
310 struct drr_object *drro = &drr->drr_u.drr_object;
311 if (drro->drr_bonuslen > 0) {
312 (void) ssread(buf,
313 P2ROUNDUP((uint64_t)drro->drr_bonuslen, 8),
314 ofp);
315 }
316 if (dump_record(drr, buf,
317 P2ROUNDUP((uint64_t)drro->drr_bonuslen, 8),
318 &stream_cksum, outfd) != 0)
319 goto out;
320 break;
321 }
322
323 case DRR_SPILL:
324 {
325 struct drr_spill *drrs = &drr->drr_u.drr_spill;
326 (void) ssread(buf, drrs->drr_length, ofp);
327 if (dump_record(drr, buf, drrs->drr_length,
328 &stream_cksum, outfd) != 0)
329 goto out;
330 break;
331 }
332
333 case DRR_FREEOBJECTS:
334 {
335 if (dump_record(drr, NULL, 0, &stream_cksum,
336 outfd) != 0)
337 goto out;
338 break;
339 }
340
341 case DRR_WRITE:
342 {
343 struct drr_write *drrw = &drr->drr_u.drr_write;
344 dataref_t dataref;
345
346 (void) ssread(buf, drrw->drr_length, ofp);
347
348 /*
349 * Use the existing checksum if it's dedup-capable,
350 * else calculate a SHA256 checksum for it.
351 */
352
353 if (ZIO_CHECKSUM_EQUAL(drrw->drr_key.ddk_cksum,
354 zero_cksum) ||
355 !DRR_IS_DEDUP_CAPABLE(drrw->drr_checksumflags)) {
356 SHA256_CTX ctx;
357 zio_cksum_t tmpsha256;
358
359 SHA256Init(&ctx);
360 SHA256Update(&ctx, buf, drrw->drr_length);
361 SHA256Final(&tmpsha256, &ctx);
362 drrw->drr_key.ddk_cksum.zc_word[0] =
363 BE_64(tmpsha256.zc_word[0]);
364 drrw->drr_key.ddk_cksum.zc_word[1] =
365 BE_64(tmpsha256.zc_word[1]);
366 drrw->drr_key.ddk_cksum.zc_word[2] =
367 BE_64(tmpsha256.zc_word[2]);
368 drrw->drr_key.ddk_cksum.zc_word[3] =
369 BE_64(tmpsha256.zc_word[3]);
370 drrw->drr_checksumtype = ZIO_CHECKSUM_SHA256;
371 drrw->drr_checksumflags = DRR_CHECKSUM_DEDUP;
372 }
373
374 dataref.ref_guid = drrw->drr_toguid;
375 dataref.ref_object = drrw->drr_object;
376 dataref.ref_offset = drrw->drr_offset;
377
378 if (ddt_update(dda->dedup_hdl, &ddt,
379 &drrw->drr_key.ddk_cksum, drrw->drr_key.ddk_prop,
380 &dataref)) {
381 dmu_replay_record_t wbr_drr = {0};
382 struct drr_write_byref *wbr_drrr =
383 &wbr_drr.drr_u.drr_write_byref;
384
385 /* block already present in stream */
386 wbr_drr.drr_type = DRR_WRITE_BYREF;
387
388 wbr_drrr->drr_object = drrw->drr_object;
389 wbr_drrr->drr_offset = drrw->drr_offset;
390 wbr_drrr->drr_length = drrw->drr_length;
391 wbr_drrr->drr_toguid = drrw->drr_toguid;
392 wbr_drrr->drr_refguid = dataref.ref_guid;
393 wbr_drrr->drr_refobject =
394 dataref.ref_object;
395 wbr_drrr->drr_refoffset =
396 dataref.ref_offset;
397
398 wbr_drrr->drr_checksumtype =
399 drrw->drr_checksumtype;
400 wbr_drrr->drr_checksumflags =
401 drrw->drr_checksumtype;
402 wbr_drrr->drr_key.ddk_cksum =
403 drrw->drr_key.ddk_cksum;
404 wbr_drrr->drr_key.ddk_prop =
405 drrw->drr_key.ddk_prop;
406
407 if (dump_record(&wbr_drr, NULL, 0,
408 &stream_cksum, outfd) != 0)
409 goto out;
410 } else {
411 /* block not previously seen */
412 if (dump_record(drr, buf, drrw->drr_length,
413 &stream_cksum, outfd) != 0)
414 goto out;
415 }
416 break;
417 }
418
419 case DRR_WRITE_EMBEDDED:
420 {
421 struct drr_write_embedded *drrwe =
422 &drr->drr_u.drr_write_embedded;
423 (void) ssread(buf,
424 P2ROUNDUP((uint64_t)drrwe->drr_psize, 8), ofp);
425 if (dump_record(drr, buf,
426 P2ROUNDUP((uint64_t)drrwe->drr_psize, 8),
427 &stream_cksum, outfd) != 0)
428 goto out;
429 break;
430 }
431
432 case DRR_FREE:
433 {
434 if (dump_record(drr, NULL, 0, &stream_cksum,
435 outfd) != 0)
436 goto out;
437 break;
438 }
439
440 default:
441 (void) fprintf(stderr, "INVALID record type 0x%x\n",
442 drr->drr_type);
443 /* should never happen, so assert */
444 assert(B_FALSE);
445 }
446 }
447 out:
448 umem_cache_destroy(ddt.ddecache);
449 free(ddt.dedup_hash_array);
450 free(buf);
451 (void) fclose(ofp);
452
453 return (NULL);
454 }
455
456 /*
457 * Routines for dealing with the AVL tree of fs-nvlists
458 */
459 typedef struct fsavl_node {
460 avl_node_t fn_node;
461 nvlist_t *fn_nvfs;
462 char *fn_snapname;
463 uint64_t fn_guid;
464 } fsavl_node_t;
465
466 static int
467 fsavl_compare(const void *arg1, const void *arg2)
468 {
469 const fsavl_node_t *fn1 = arg1;
470 const fsavl_node_t *fn2 = arg2;
471
472 if (fn1->fn_guid > fn2->fn_guid)
473 return (+1);
474 else if (fn1->fn_guid < fn2->fn_guid)
475 return (-1);
476 else
477 return (0);
478 }
479
480 /*
481 * Given the GUID of a snapshot, find its containing filesystem and
482 * (optionally) name.
483 */
484 static nvlist_t *
485 fsavl_find(avl_tree_t *avl, uint64_t snapguid, char **snapname)
486 {
487 fsavl_node_t fn_find;
488 fsavl_node_t *fn;
489
490 fn_find.fn_guid = snapguid;
491
492 fn = avl_find(avl, &fn_find, NULL);
493 if (fn) {
494 if (snapname)
495 *snapname = fn->fn_snapname;
496 return (fn->fn_nvfs);
497 }
498 return (NULL);
499 }
500
501 static void
502 fsavl_destroy(avl_tree_t *avl)
503 {
504 fsavl_node_t *fn;
505 void *cookie;
506
507 if (avl == NULL)
508 return;
509
510 cookie = NULL;
511 while ((fn = avl_destroy_nodes(avl, &cookie)) != NULL)
512 free(fn);
513 avl_destroy(avl);
514 free(avl);
515 }
516
517 /*
518 * Given an nvlist, produce an avl tree of snapshots, ordered by guid
519 */
520 static avl_tree_t *
521 fsavl_create(nvlist_t *fss)
522 {
523 avl_tree_t *fsavl;
524 nvpair_t *fselem = NULL;
525
526 if ((fsavl = malloc(sizeof (avl_tree_t))) == NULL)
527 return (NULL);
528
529 avl_create(fsavl, fsavl_compare, sizeof (fsavl_node_t),
530 offsetof(fsavl_node_t, fn_node));
531
532 while ((fselem = nvlist_next_nvpair(fss, fselem)) != NULL) {
533 nvlist_t *nvfs, *snaps;
534 nvpair_t *snapelem = NULL;
535
536 VERIFY(0 == nvpair_value_nvlist(fselem, &nvfs));
537 VERIFY(0 == nvlist_lookup_nvlist(nvfs, "snaps", &snaps));
538
539 while ((snapelem =
540 nvlist_next_nvpair(snaps, snapelem)) != NULL) {
541 fsavl_node_t *fn;
542 uint64_t guid;
543
544 VERIFY(0 == nvpair_value_uint64(snapelem, &guid));
545 if ((fn = malloc(sizeof (fsavl_node_t))) == NULL) {
546 fsavl_destroy(fsavl);
547 return (NULL);
548 }
549 fn->fn_nvfs = nvfs;
550 fn->fn_snapname = nvpair_name(snapelem);
551 fn->fn_guid = guid;
552
553 /*
554 * Note: if there are multiple snaps with the
555 * same GUID, we ignore all but one.
556 */
557 if (avl_find(fsavl, fn, NULL) == NULL)
558 avl_add(fsavl, fn);
559 else
560 free(fn);
561 }
562 }
563
564 return (fsavl);
565 }
566
567 /*
568 * Routines for dealing with the giant nvlist of fs-nvlists, etc.
569 */
570 typedef struct send_data {
571 uint64_t parent_fromsnap_guid;
572 nvlist_t *parent_snaps;
573 nvlist_t *fss;
574 nvlist_t *snapprops;
575 const char *fromsnap;
576 const char *tosnap;
577 boolean_t recursive;
578
579 /*
580 * The header nvlist is of the following format:
581 * {
582 * "tosnap" -> string
583 * "fromsnap" -> string (if incremental)
584 * "fss" -> {
585 * id -> {
586 *
587 * "name" -> string (full name; for debugging)
588 * "parentfromsnap" -> number (guid of fromsnap in parent)
589 *
590 * "props" -> { name -> value (only if set here) }
591 * "snaps" -> { name (lastname) -> number (guid) }
592 * "snapprops" -> { name (lastname) -> { name -> value } }
593 *
594 * "origin" -> number (guid) (if clone)
595 * "sent" -> boolean (not on-disk)
596 * }
597 * }
598 * }
599 *
600 */
601 } send_data_t;
602
603 static void send_iterate_prop(zfs_handle_t *zhp, nvlist_t *nv);
604
605 static int
606 send_iterate_snap(zfs_handle_t *zhp, void *arg)
607 {
608 send_data_t *sd = arg;
609 uint64_t guid = zhp->zfs_dmustats.dds_guid;
610 char *snapname;
611 nvlist_t *nv;
612
613 snapname = strrchr(zhp->zfs_name, '@')+1;
614
615 VERIFY(0 == nvlist_add_uint64(sd->parent_snaps, snapname, guid));
616 /*
617 * NB: if there is no fromsnap here (it's a newly created fs in
618 * an incremental replication), we will substitute the tosnap.
619 */
620 if ((sd->fromsnap && strcmp(snapname, sd->fromsnap) == 0) ||
621 (sd->parent_fromsnap_guid == 0 && sd->tosnap &&
622 strcmp(snapname, sd->tosnap) == 0)) {
623 sd->parent_fromsnap_guid = guid;
624 }
625
626 VERIFY(0 == nvlist_alloc(&nv, NV_UNIQUE_NAME, 0));
627 send_iterate_prop(zhp, nv);
628 VERIFY(0 == nvlist_add_nvlist(sd->snapprops, snapname, nv));
629 nvlist_free(nv);
630
631 zfs_close(zhp);
632 return (0);
633 }
634
635 static void
636 send_iterate_prop(zfs_handle_t *zhp, nvlist_t *nv)
637 {
638 nvpair_t *elem = NULL;
639
640 while ((elem = nvlist_next_nvpair(zhp->zfs_props, elem)) != NULL) {
641 char *propname = nvpair_name(elem);
642 zfs_prop_t prop = zfs_name_to_prop(propname);
643 nvlist_t *propnv;
644
645 if (!zfs_prop_user(propname)) {
646 /*
647 * Realistically, this should never happen. However,
648 * we want the ability to add DSL properties without
649 * needing to make incompatible version changes. We
650 * need to ignore unknown properties to allow older
651 * software to still send datasets containing these
652 * properties, with the unknown properties elided.
653 */
654 if (prop == ZPROP_INVAL)
655 continue;
656
657 if (zfs_prop_readonly(prop))
658 continue;
659 }
660
661 verify(nvpair_value_nvlist(elem, &propnv) == 0);
662 if (prop == ZFS_PROP_QUOTA || prop == ZFS_PROP_RESERVATION ||
663 prop == ZFS_PROP_REFQUOTA ||
664 prop == ZFS_PROP_REFRESERVATION) {
665 char *source;
666 uint64_t value;
667 verify(nvlist_lookup_uint64(propnv,
668 ZPROP_VALUE, &value) == 0);
669 if (zhp->zfs_type == ZFS_TYPE_SNAPSHOT)
670 continue;
671 /*
672 * May have no source before SPA_VERSION_RECVD_PROPS,
673 * but is still modifiable.
674 */
675 if (nvlist_lookup_string(propnv,
676 ZPROP_SOURCE, &source) == 0) {
677 if ((strcmp(source, zhp->zfs_name) != 0) &&
678 (strcmp(source,
679 ZPROP_SOURCE_VAL_RECVD) != 0))
680 continue;
681 }
682 } else {
683 char *source;
684 if (nvlist_lookup_string(propnv,
685 ZPROP_SOURCE, &source) != 0)
686 continue;
687 if ((strcmp(source, zhp->zfs_name) != 0) &&
688 (strcmp(source, ZPROP_SOURCE_VAL_RECVD) != 0))
689 continue;
690 }
691
692 if (zfs_prop_user(propname) ||
693 zfs_prop_get_type(prop) == PROP_TYPE_STRING) {
694 char *value;
695 verify(nvlist_lookup_string(propnv,
696 ZPROP_VALUE, &value) == 0);
697 VERIFY(0 == nvlist_add_string(nv, propname, value));
698 } else {
699 uint64_t value;
700 verify(nvlist_lookup_uint64(propnv,
701 ZPROP_VALUE, &value) == 0);
702 VERIFY(0 == nvlist_add_uint64(nv, propname, value));
703 }
704 }
705 }
706
707 /*
708 * recursively generate nvlists describing datasets. See comment
709 * for the data structure send_data_t above for description of contents
710 * of the nvlist.
711 */
712 static int
713 send_iterate_fs(zfs_handle_t *zhp, void *arg)
714 {
715 send_data_t *sd = arg;
716 nvlist_t *nvfs, *nv;
717 int rv = 0;
718 uint64_t parent_fromsnap_guid_save = sd->parent_fromsnap_guid;
719 uint64_t guid = zhp->zfs_dmustats.dds_guid;
720 char guidstring[64];
721
722 VERIFY(0 == nvlist_alloc(&nvfs, NV_UNIQUE_NAME, 0));
723 VERIFY(0 == nvlist_add_string(nvfs, "name", zhp->zfs_name));
724 VERIFY(0 == nvlist_add_uint64(nvfs, "parentfromsnap",
725 sd->parent_fromsnap_guid));
726
727 if (zhp->zfs_dmustats.dds_origin[0]) {
728 zfs_handle_t *origin = zfs_open(zhp->zfs_hdl,
729 zhp->zfs_dmustats.dds_origin, ZFS_TYPE_SNAPSHOT);
730 if (origin == NULL)
731 return (-1);
732 VERIFY(0 == nvlist_add_uint64(nvfs, "origin",
733 origin->zfs_dmustats.dds_guid));
734 }
735
736 /* iterate over props */
737 VERIFY(0 == nvlist_alloc(&nv, NV_UNIQUE_NAME, 0));
738 send_iterate_prop(zhp, nv);
739 VERIFY(0 == nvlist_add_nvlist(nvfs, "props", nv));
740 nvlist_free(nv);
741
742 /* iterate over snaps, and set sd->parent_fromsnap_guid */
743 sd->parent_fromsnap_guid = 0;
744 VERIFY(0 == nvlist_alloc(&sd->parent_snaps, NV_UNIQUE_NAME, 0));
745 VERIFY(0 == nvlist_alloc(&sd->snapprops, NV_UNIQUE_NAME, 0));
746 (void) zfs_iter_snapshots(zhp, send_iterate_snap, sd);
747 VERIFY(0 == nvlist_add_nvlist(nvfs, "snaps", sd->parent_snaps));
748 VERIFY(0 == nvlist_add_nvlist(nvfs, "snapprops", sd->snapprops));
749 nvlist_free(sd->parent_snaps);
750 nvlist_free(sd->snapprops);
751
752 /* add this fs to nvlist */
753 (void) snprintf(guidstring, sizeof (guidstring),
754 "0x%llx", (longlong_t)guid);
755 VERIFY(0 == nvlist_add_nvlist(sd->fss, guidstring, nvfs));
756 nvlist_free(nvfs);
757
758 /* iterate over children */
759 if (sd->recursive)
760 rv = zfs_iter_filesystems(zhp, send_iterate_fs, sd);
761
762 sd->parent_fromsnap_guid = parent_fromsnap_guid_save;
763
764 zfs_close(zhp);
765 return (rv);
766 }
767
768 static int
769 gather_nvlist(libzfs_handle_t *hdl, const char *fsname, const char *fromsnap,
770 const char *tosnap, boolean_t recursive, nvlist_t **nvlp, avl_tree_t **avlp)
771 {
772 zfs_handle_t *zhp;
773 send_data_t sd = { 0 };
774 int error;
775
776 zhp = zfs_open(hdl, fsname, ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME);
777 if (zhp == NULL)
778 return (EZFS_BADTYPE);
779
780 VERIFY(0 == nvlist_alloc(&sd.fss, NV_UNIQUE_NAME, 0));
781 sd.fromsnap = fromsnap;
782 sd.tosnap = tosnap;
783 sd.recursive = recursive;
784
785 if ((error = send_iterate_fs(zhp, &sd)) != 0) {
786 nvlist_free(sd.fss);
787 if (avlp != NULL)
788 *avlp = NULL;
789 *nvlp = NULL;
790 return (error);
791 }
792
793 if (avlp != NULL && (*avlp = fsavl_create(sd.fss)) == NULL) {
794 nvlist_free(sd.fss);
795 *nvlp = NULL;
796 return (EZFS_NOMEM);
797 }
798
799 *nvlp = sd.fss;
800 return (0);
801 }
802
803 /*
804 * Routines specific to "zfs send"
805 */
806 typedef struct send_dump_data {
807 /* these are all just the short snapname (the part after the @) */
808 const char *fromsnap;
809 const char *tosnap;
810 char prevsnap[ZFS_MAXNAMELEN];
811 uint64_t prevsnap_obj;
812 boolean_t seenfrom, seento, replicate, doall, fromorigin;
813 boolean_t verbose, dryrun, parsable, progress, embed_data, std_out;
814 boolean_t large_block;
815 int outfd;
816 boolean_t err;
817 nvlist_t *fss;
818 nvlist_t *snapholds;
819 avl_tree_t *fsavl;
820 snapfilter_cb_t *filter_cb;
821 void *filter_cb_arg;
822 nvlist_t *debugnv;
823 char holdtag[ZFS_MAXNAMELEN];
824 int cleanup_fd;
825 uint64_t size;
826 } send_dump_data_t;
827
828 static int
829 estimate_ioctl(zfs_handle_t *zhp, uint64_t fromsnap_obj,
830 boolean_t fromorigin, uint64_t *sizep)
831 {
832 zfs_cmd_t zc = { 0 };
833 libzfs_handle_t *hdl = zhp->zfs_hdl;
834
835 assert(zhp->zfs_type == ZFS_TYPE_SNAPSHOT);
836 assert(fromsnap_obj == 0 || !fromorigin);
837
838 (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
839 zc.zc_obj = fromorigin;
840 zc.zc_sendobj = zfs_prop_get_int(zhp, ZFS_PROP_OBJSETID);
841 zc.zc_fromobj = fromsnap_obj;
842 zc.zc_guid = 1; /* estimate flag */
843
844 if (zfs_ioctl(zhp->zfs_hdl, ZFS_IOC_SEND, &zc) != 0) {
845 char errbuf[1024];
846 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
847 "warning: cannot estimate space for '%s'"), zhp->zfs_name);
848
849 switch (errno) {
850 case EXDEV:
851 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
852 "not an earlier snapshot from the same fs"));
853 return (zfs_error(hdl, EZFS_CROSSTARGET, errbuf));
854
855 case ENOENT:
856 if (zfs_dataset_exists(hdl, zc.zc_name,
857 ZFS_TYPE_SNAPSHOT)) {
858 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
859 "incremental source (@%s) does not exist"),
860 zc.zc_value);
861 }
862 return (zfs_error(hdl, EZFS_NOENT, errbuf));
863
864 case EDQUOT:
865 case EFBIG:
866 case EIO:
867 case ENOLINK:
868 case ENOSPC:
869 case ENOSTR:
870 case ENXIO:
871 case EPIPE:
872 case ERANGE:
873 case EFAULT:
874 case EROFS:
875 zfs_error_aux(hdl, strerror(errno));
876 return (zfs_error(hdl, EZFS_BADBACKUP, errbuf));
877
878 default:
879 return (zfs_standard_error(hdl, errno, errbuf));
880 }
881 }
882
883 *sizep = zc.zc_objset_type;
884
885 return (0);
886 }
887
888 /*
889 * Dumps a backup of the given snapshot (incremental from fromsnap if it's not
890 * NULL) to the file descriptor specified by outfd.
891 */
892 static int
893 dump_ioctl(zfs_handle_t *zhp, const char *fromsnap, uint64_t fromsnap_obj,
894 boolean_t fromorigin, int outfd, enum lzc_send_flags flags,
895 nvlist_t *debugnv)
896 {
897 zfs_cmd_t zc = { 0 };
898 libzfs_handle_t *hdl = zhp->zfs_hdl;
899 nvlist_t *thisdbg;
900
901 assert(zhp->zfs_type == ZFS_TYPE_SNAPSHOT);
902 assert(fromsnap_obj == 0 || !fromorigin);
903
904 (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
905 zc.zc_cookie = outfd;
906 zc.zc_obj = fromorigin;
907 zc.zc_sendobj = zfs_prop_get_int(zhp, ZFS_PROP_OBJSETID);
908 zc.zc_fromobj = fromsnap_obj;
909 zc.zc_flags = flags;
910
911 VERIFY(0 == nvlist_alloc(&thisdbg, NV_UNIQUE_NAME, 0));
912 if (fromsnap && fromsnap[0] != '\0') {
913 VERIFY(0 == nvlist_add_string(thisdbg,
914 "fromsnap", fromsnap));
915 }
916
917 if (zfs_ioctl(zhp->zfs_hdl, ZFS_IOC_SEND, &zc) != 0) {
918 char errbuf[1024];
919 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
920 "warning: cannot send '%s'"), zhp->zfs_name);
921
922 VERIFY(0 == nvlist_add_uint64(thisdbg, "error", errno));
923 if (debugnv) {
924 VERIFY(0 == nvlist_add_nvlist(debugnv,
925 zhp->zfs_name, thisdbg));
926 }
927 nvlist_free(thisdbg);
928
929 switch (errno) {
930 case EXDEV:
931 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
932 "not an earlier snapshot from the same fs"));
933 return (zfs_error(hdl, EZFS_CROSSTARGET, errbuf));
934
935 case ENOENT:
936 if (zfs_dataset_exists(hdl, zc.zc_name,
937 ZFS_TYPE_SNAPSHOT)) {
938 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
939 "incremental source (@%s) does not exist"),
940 zc.zc_value);
941 }
942 return (zfs_error(hdl, EZFS_NOENT, errbuf));
943
944 case EDQUOT:
945 case EFBIG:
946 case EIO:
947 case ENOLINK:
948 case ENOSPC:
949 case ENOSTR:
950 case ENXIO:
951 case EPIPE:
952 case ERANGE:
953 case EFAULT:
954 case EROFS:
955 zfs_error_aux(hdl, strerror(errno));
956 return (zfs_error(hdl, EZFS_BADBACKUP, errbuf));
957
958 default:
959 return (zfs_standard_error(hdl, errno, errbuf));
960 }
961 }
962
963 if (debugnv)
964 VERIFY(0 == nvlist_add_nvlist(debugnv, zhp->zfs_name, thisdbg));
965 nvlist_free(thisdbg);
966
967 return (0);
968 }
969
970 static void
971 gather_holds(zfs_handle_t *zhp, send_dump_data_t *sdd)
972 {
973 assert(zhp->zfs_type == ZFS_TYPE_SNAPSHOT);
974
975 /*
976 * zfs_send() only sets snapholds for sends that need them,
977 * e.g. replication and doall.
978 */
979 if (sdd->snapholds == NULL)
980 return;
981
982 fnvlist_add_string(sdd->snapholds, zhp->zfs_name, sdd->holdtag);
983 }
984
985 static void *
986 send_progress_thread(void *arg)
987 {
988 progress_arg_t *pa = arg;
989
990 zfs_cmd_t zc = { 0 };
991 zfs_handle_t *zhp = pa->pa_zhp;
992 libzfs_handle_t *hdl = zhp->zfs_hdl;
993 unsigned long long bytes;
994 char buf[16];
995
996 time_t t;
997 struct tm *tm;
998
999 assert(zhp->zfs_type == ZFS_TYPE_SNAPSHOT);
1000 (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
1001
1002 if (!pa->pa_parsable)
1003 (void) fprintf(stderr, "TIME SENT SNAPSHOT\n");
1004
1005 /*
1006 * Print the progress from ZFS_IOC_SEND_PROGRESS every second.
1007 */
1008 for (;;) {
1009 (void) sleep(1);
1010
1011 zc.zc_cookie = pa->pa_fd;
1012 if (zfs_ioctl(hdl, ZFS_IOC_SEND_PROGRESS, &zc) != 0)
1013 return ((void *)-1);
1014
1015 (void) time(&t);
1016 tm = localtime(&t);
1017 bytes = zc.zc_cookie;
1018
1019 if (pa->pa_parsable) {
1020 (void) fprintf(stderr, "%02d:%02d:%02d\t%llu\t%s\n",
1021 tm->tm_hour, tm->tm_min, tm->tm_sec,
1022 bytes, zhp->zfs_name);
1023 } else {
1024 zfs_nicenum(bytes, buf, sizeof (buf));
1025 (void) fprintf(stderr, "%02d:%02d:%02d %5s %s\n",
1026 tm->tm_hour, tm->tm_min, tm->tm_sec,
1027 buf, zhp->zfs_name);
1028 }
1029 }
1030 }
1031
1032 static int
1033 dump_snapshot(zfs_handle_t *zhp, void *arg)
1034 {
1035 send_dump_data_t *sdd = arg;
1036 progress_arg_t pa = { 0 };
1037 pthread_t tid;
1038 char *thissnap;
1039 int err;
1040 boolean_t isfromsnap, istosnap, fromorigin;
1041 boolean_t exclude = B_FALSE;
1042 FILE *fout = sdd->std_out ? stdout : stderr;
1043
1044 err = 0;
1045 thissnap = strchr(zhp->zfs_name, '@') + 1;
1046 isfromsnap = (sdd->fromsnap != NULL &&
1047 strcmp(sdd->fromsnap, thissnap) == 0);
1048
1049 if (!sdd->seenfrom && isfromsnap) {
1050 gather_holds(zhp, sdd);
1051 sdd->seenfrom = B_TRUE;
1052 (void) strcpy(sdd->prevsnap, thissnap);
1053 sdd->prevsnap_obj = zfs_prop_get_int(zhp, ZFS_PROP_OBJSETID);
1054 zfs_close(zhp);
1055 return (0);
1056 }
1057
1058 if (sdd->seento || !sdd->seenfrom) {
1059 zfs_close(zhp);
1060 return (0);
1061 }
1062
1063 istosnap = (strcmp(sdd->tosnap, thissnap) == 0);
1064 if (istosnap)
1065 sdd->seento = B_TRUE;
1066
1067 if (!sdd->doall && !isfromsnap && !istosnap) {
1068 if (sdd->replicate) {
1069 char *snapname;
1070 nvlist_t *snapprops;
1071 /*
1072 * Filter out all intermediate snapshots except origin
1073 * snapshots needed to replicate clones.
1074 */
1075 nvlist_t *nvfs = fsavl_find(sdd->fsavl,
1076 zhp->zfs_dmustats.dds_guid, &snapname);
1077
1078 VERIFY(0 == nvlist_lookup_nvlist(nvfs,
1079 "snapprops", &snapprops));
1080 VERIFY(0 == nvlist_lookup_nvlist(snapprops,
1081 thissnap, &snapprops));
1082 exclude = !nvlist_exists(snapprops, "is_clone_origin");
1083 } else {
1084 exclude = B_TRUE;
1085 }
1086 }
1087
1088 /*
1089 * If a filter function exists, call it to determine whether
1090 * this snapshot will be sent.
1091 */
1092 if (exclude || (sdd->filter_cb != NULL &&
1093 sdd->filter_cb(zhp, sdd->filter_cb_arg) == B_FALSE)) {
1094 /*
1095 * This snapshot is filtered out. Don't send it, and don't
1096 * set prevsnap_obj, so it will be as if this snapshot didn't
1097 * exist, and the next accepted snapshot will be sent as
1098 * an incremental from the last accepted one, or as the
1099 * first (and full) snapshot in the case of a replication,
1100 * non-incremental send.
1101 */
1102 zfs_close(zhp);
1103 return (0);
1104 }
1105
1106 gather_holds(zhp, sdd);
1107 fromorigin = sdd->prevsnap[0] == '\0' &&
1108 (sdd->fromorigin || sdd->replicate);
1109
1110 if (sdd->verbose) {
1111 uint64_t size;
1112 err = estimate_ioctl(zhp, sdd->prevsnap_obj,
1113 fromorigin, &size);
1114
1115 if (sdd->parsable) {
1116 if (sdd->prevsnap[0] != '\0') {
1117 (void) fprintf(fout, "incremental\t%s\t%s",
1118 sdd->prevsnap, zhp->zfs_name);
1119 } else {
1120 (void) fprintf(fout, "full\t%s",
1121 zhp->zfs_name);
1122 }
1123 } else {
1124 (void) fprintf(fout, dgettext(TEXT_DOMAIN,
1125 "send from @%s to %s"),
1126 sdd->prevsnap, zhp->zfs_name);
1127 }
1128 if (err == 0) {
1129 if (sdd->parsable) {
1130 (void) fprintf(fout, "\t%llu\n",
1131 (longlong_t)size);
1132 } else {
1133 char buf[16];
1134 zfs_nicenum(size, buf, sizeof (buf));
1135 (void) fprintf(fout, dgettext(TEXT_DOMAIN,
1136 " estimated size is %s\n"), buf);
1137 }
1138 sdd->size += size;
1139 } else {
1140 (void) fprintf(fout, "\n");
1141 }
1142 }
1143
1144 if (!sdd->dryrun) {
1145 /*
1146 * If progress reporting is requested, spawn a new thread to
1147 * poll ZFS_IOC_SEND_PROGRESS at a regular interval.
1148 */
1149 if (sdd->progress) {
1150 pa.pa_zhp = zhp;
1151 pa.pa_fd = sdd->outfd;
1152 pa.pa_parsable = sdd->parsable;
1153
1154 if (err = pthread_create(&tid, NULL,
1155 send_progress_thread, &pa)) {
1156 zfs_close(zhp);
1157 return (err);
1158 }
1159 }
1160
1161 enum lzc_send_flags flags = 0;
1162 if (sdd->large_block)
1163 flags |= LZC_SEND_FLAG_LARGE_BLOCK;
1164 if (sdd->embed_data)
1165 flags |= LZC_SEND_FLAG_EMBED_DATA;
1166
1167 err = dump_ioctl(zhp, sdd->prevsnap, sdd->prevsnap_obj,
1168 fromorigin, sdd->outfd, flags, sdd->debugnv);
1169
1170 if (sdd->progress) {
1171 (void) pthread_cancel(tid);
1172 (void) pthread_join(tid, NULL);
1173 }
1174 }
1175
1176 (void) strcpy(sdd->prevsnap, thissnap);
1177 sdd->prevsnap_obj = zfs_prop_get_int(zhp, ZFS_PROP_OBJSETID);
1178 zfs_close(zhp);
1179 return (err);
1180 }
1181
1182 static int
1183 dump_filesystem(zfs_handle_t *zhp, void *arg)
1184 {
1185 int rv = 0;
1186 send_dump_data_t *sdd = arg;
1187 boolean_t missingfrom = B_FALSE;
1188 zfs_cmd_t zc = { 0 };
1189
1190 (void) snprintf(zc.zc_name, sizeof (zc.zc_name), "%s@%s",
1191 zhp->zfs_name, sdd->tosnap);
1192 if (ioctl(zhp->zfs_hdl->libzfs_fd, ZFS_IOC_OBJSET_STATS, &zc) != 0) {
1193 (void) fprintf(stderr, dgettext(TEXT_DOMAIN,
1194 "WARNING: could not send %s@%s: does not exist\n"),
1195 zhp->zfs_name, sdd->tosnap);
1196 sdd->err = B_TRUE;
1197 return (0);
1198 }
1199
1200 if (sdd->replicate && sdd->fromsnap) {
1201 /*
1202 * If this fs does not have fromsnap, and we're doing
1203 * recursive, we need to send a full stream from the
1204 * beginning (or an incremental from the origin if this
1205 * is a clone). If we're doing non-recursive, then let
1206 * them get the error.
1207 */
1208 (void) snprintf(zc.zc_name, sizeof (zc.zc_name), "%s@%s",
1209 zhp->zfs_name, sdd->fromsnap);
1210 if (ioctl(zhp->zfs_hdl->libzfs_fd,
1211 ZFS_IOC_OBJSET_STATS, &zc) != 0) {
1212 missingfrom = B_TRUE;
1213 }
1214 }
1215
1216 sdd->seenfrom = sdd->seento = sdd->prevsnap[0] = 0;
1217 sdd->prevsnap_obj = 0;
1218 if (sdd->fromsnap == NULL || missingfrom)
1219 sdd->seenfrom = B_TRUE;
1220
1221 rv = zfs_iter_snapshots_sorted(zhp, dump_snapshot, arg);
1222 if (!sdd->seenfrom) {
1223 (void) fprintf(stderr, dgettext(TEXT_DOMAIN,
1224 "WARNING: could not send %s@%s:\n"
1225 "incremental source (%s@%s) does not exist\n"),
1226 zhp->zfs_name, sdd->tosnap,
1227 zhp->zfs_name, sdd->fromsnap);
1228 sdd->err = B_TRUE;
1229 } else if (!sdd->seento) {
1230 if (sdd->fromsnap) {
1231 (void) fprintf(stderr, dgettext(TEXT_DOMAIN,
1232 "WARNING: could not send %s@%s:\n"
1233 "incremental source (%s@%s) "
1234 "is not earlier than it\n"),
1235 zhp->zfs_name, sdd->tosnap,
1236 zhp->zfs_name, sdd->fromsnap);
1237 } else {
1238 (void) fprintf(stderr, dgettext(TEXT_DOMAIN,
1239 "WARNING: "
1240 "could not send %s@%s: does not exist\n"),
1241 zhp->zfs_name, sdd->tosnap);
1242 }
1243 sdd->err = B_TRUE;
1244 }
1245
1246 return (rv);
1247 }
1248
1249 static int
1250 dump_filesystems(zfs_handle_t *rzhp, void *arg)
1251 {
1252 send_dump_data_t *sdd = arg;
1253 nvpair_t *fspair;
1254 boolean_t needagain, progress;
1255
1256 if (!sdd->replicate)
1257 return (dump_filesystem(rzhp, sdd));
1258
1259 /* Mark the clone origin snapshots. */
1260 for (fspair = nvlist_next_nvpair(sdd->fss, NULL); fspair;
1261 fspair = nvlist_next_nvpair(sdd->fss, fspair)) {
1262 nvlist_t *nvfs;
1263 uint64_t origin_guid = 0;
1264
1265 VERIFY(0 == nvpair_value_nvlist(fspair, &nvfs));
1266 (void) nvlist_lookup_uint64(nvfs, "origin", &origin_guid);
1267 if (origin_guid != 0) {
1268 char *snapname;
1269 nvlist_t *origin_nv = fsavl_find(sdd->fsavl,
1270 origin_guid, &snapname);
1271 if (origin_nv != NULL) {
1272 nvlist_t *snapprops;
1273 VERIFY(0 == nvlist_lookup_nvlist(origin_nv,
1274 "snapprops", &snapprops));
1275 VERIFY(0 == nvlist_lookup_nvlist(snapprops,
1276 snapname, &snapprops));
1277 VERIFY(0 == nvlist_add_boolean(
1278 snapprops, "is_clone_origin"));
1279 }
1280 }
1281 }
1282 again:
1283 needagain = progress = B_FALSE;
1284 for (fspair = nvlist_next_nvpair(sdd->fss, NULL); fspair;
1285 fspair = nvlist_next_nvpair(sdd->fss, fspair)) {
1286 nvlist_t *fslist, *parent_nv;
1287 char *fsname;
1288 zfs_handle_t *zhp;
1289 int err;
1290 uint64_t origin_guid = 0;
1291 uint64_t parent_guid = 0;
1292
1293 VERIFY(nvpair_value_nvlist(fspair, &fslist) == 0);
1294 if (nvlist_lookup_boolean(fslist, "sent") == 0)
1295 continue;
1296
1297 VERIFY(nvlist_lookup_string(fslist, "name", &fsname) == 0);
1298 (void) nvlist_lookup_uint64(fslist, "origin", &origin_guid);
1299 (void) nvlist_lookup_uint64(fslist, "parentfromsnap",
1300 &parent_guid);
1301
1302 if (parent_guid != 0) {
1303 parent_nv = fsavl_find(sdd->fsavl, parent_guid, NULL);
1304 if (!nvlist_exists(parent_nv, "sent")) {
1305 /* parent has not been sent; skip this one */
1306 needagain = B_TRUE;
1307 continue;
1308 }
1309 }
1310
1311 if (origin_guid != 0) {
1312 nvlist_t *origin_nv = fsavl_find(sdd->fsavl,
1313 origin_guid, NULL);
1314 if (origin_nv != NULL &&
1315 !nvlist_exists(origin_nv, "sent")) {
1316 /*
1317 * origin has not been sent yet;
1318 * skip this clone.
1319 */
1320 needagain = B_TRUE;
1321 continue;
1322 }
1323 }
1324
1325 zhp = zfs_open(rzhp->zfs_hdl, fsname, ZFS_TYPE_DATASET);
1326 if (zhp == NULL)
1327 return (-1);
1328 err = dump_filesystem(zhp, sdd);
1329 VERIFY(nvlist_add_boolean(fslist, "sent") == 0);
1330 progress = B_TRUE;
1331 zfs_close(zhp);
1332 if (err)
1333 return (err);
1334 }
1335 if (needagain) {
1336 assert(progress);
1337 goto again;
1338 }
1339
1340 /* clean out the sent flags in case we reuse this fss */
1341 for (fspair = nvlist_next_nvpair(sdd->fss, NULL); fspair;
1342 fspair = nvlist_next_nvpair(sdd->fss, fspair)) {
1343 nvlist_t *fslist;
1344
1345 VERIFY(nvpair_value_nvlist(fspair, &fslist) == 0);
1346 (void) nvlist_remove_all(fslist, "sent");
1347 }
1348
1349 return (0);
1350 }
1351
1352 /*
1353 * Generate a send stream for the dataset identified by the argument zhp.
1354 *
1355 * The content of the send stream is the snapshot identified by
1356 * 'tosnap'. Incremental streams are requested in two ways:
1357 * - from the snapshot identified by "fromsnap" (if non-null) or
1358 * - from the origin of the dataset identified by zhp, which must
1359 * be a clone. In this case, "fromsnap" is null and "fromorigin"
1360 * is TRUE.
1361 *
1362 * The send stream is recursive (i.e. dumps a hierarchy of snapshots) and
1363 * uses a special header (with a hdrtype field of DMU_COMPOUNDSTREAM)
1364 * if "replicate" is set. If "doall" is set, dump all the intermediate
1365 * snapshots. The DMU_COMPOUNDSTREAM header is used in the "doall"
1366 * case too. If "props" is set, send properties.
1367 */
1368 int
1369 zfs_send(zfs_handle_t *zhp, const char *fromsnap, const char *tosnap,
1370 sendflags_t *flags, int outfd, snapfilter_cb_t filter_func,
1371 void *cb_arg, nvlist_t **debugnvp)
1372 {
1373 char errbuf[1024];
1374 send_dump_data_t sdd = { 0 };
1375 int err = 0;
1376 nvlist_t *fss = NULL;
1377 avl_tree_t *fsavl = NULL;
1378 static uint64_t holdseq;
1379 int spa_version;
1380 pthread_t tid = 0;
1381 int pipefd[2];
1382 dedup_arg_t dda = { 0 };
1383 int featureflags = 0;
1384 FILE *fout;
1385
1386 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
1387 "cannot send '%s'"), zhp->zfs_name);
1388
1389 if (fromsnap && fromsnap[0] == '\0') {
1390 zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN,
1391 "zero-length incremental source"));
1392 return (zfs_error(zhp->zfs_hdl, EZFS_NOENT, errbuf));
1393 }
1394
1395 if (zhp->zfs_type == ZFS_TYPE_FILESYSTEM) {
1396 uint64_t version;
1397 version = zfs_prop_get_int(zhp, ZFS_PROP_VERSION);
1398 if (version >= ZPL_VERSION_SA) {
1399 featureflags |= DMU_BACKUP_FEATURE_SA_SPILL;
1400 }
1401 }
1402
1403 if (flags->dedup && !flags->dryrun) {
1404 featureflags |= (DMU_BACKUP_FEATURE_DEDUP |
1405 DMU_BACKUP_FEATURE_DEDUPPROPS);
1406 if (err = pipe(pipefd)) {
1407 zfs_error_aux(zhp->zfs_hdl, strerror(errno));
1408 return (zfs_error(zhp->zfs_hdl, EZFS_PIPEFAILED,
1409 errbuf));
1410 }
1411 dda.outputfd = outfd;
1412 dda.inputfd = pipefd[1];
1413 dda.dedup_hdl = zhp->zfs_hdl;
1414 if (err = pthread_create(&tid, NULL, cksummer, &dda)) {
1415 (void) close(pipefd[0]);
1416 (void) close(pipefd[1]);
1417 zfs_error_aux(zhp->zfs_hdl, strerror(errno));
1418 return (zfs_error(zhp->zfs_hdl,
1419 EZFS_THREADCREATEFAILED, errbuf));
1420 }
1421 }
1422
1423 if (flags->replicate || flags->doall || flags->props) {
1424 dmu_replay_record_t drr = { 0 };
1425 char *packbuf = NULL;
1426 size_t buflen = 0;
1427 zio_cksum_t zc = { 0 };
1428
1429 if (flags->replicate || flags->props) {
1430 nvlist_t *hdrnv;
1431
1432 VERIFY(0 == nvlist_alloc(&hdrnv, NV_UNIQUE_NAME, 0));
1433 if (fromsnap) {
1434 VERIFY(0 == nvlist_add_string(hdrnv,
1435 "fromsnap", fromsnap));
1436 }
1437 VERIFY(0 == nvlist_add_string(hdrnv, "tosnap", tosnap));
1438 if (!flags->replicate) {
1439 VERIFY(0 == nvlist_add_boolean(hdrnv,
1440 "not_recursive"));
1441 }
1442
1443 err = gather_nvlist(zhp->zfs_hdl, zhp->zfs_name,
1444 fromsnap, tosnap, flags->replicate, &fss, &fsavl);
1445 if (err)
1446 goto err_out;
1447 VERIFY(0 == nvlist_add_nvlist(hdrnv, "fss", fss));
1448 err = nvlist_pack(hdrnv, &packbuf, &buflen,
1449 NV_ENCODE_XDR, 0);
1450 if (debugnvp)
1451 *debugnvp = hdrnv;
1452 else
1453 nvlist_free(hdrnv);
1454 if (err)
1455 goto stderr_out;
1456 }
1457
1458 if (!flags->dryrun) {
1459 /* write first begin record */
1460 drr.drr_type = DRR_BEGIN;
1461 drr.drr_u.drr_begin.drr_magic = DMU_BACKUP_MAGIC;
1462 DMU_SET_STREAM_HDRTYPE(drr.drr_u.drr_begin.
1463 drr_versioninfo, DMU_COMPOUNDSTREAM);
1464 DMU_SET_FEATUREFLAGS(drr.drr_u.drr_begin.
1465 drr_versioninfo, featureflags);
1466 (void) snprintf(drr.drr_u.drr_begin.drr_toname,
1467 sizeof (drr.drr_u.drr_begin.drr_toname),
1468 "%s@%s", zhp->zfs_name, tosnap);
1469 drr.drr_payloadlen = buflen;
1470
1471 err = dump_record(&drr, packbuf, buflen, &zc, outfd);
1472 free(packbuf);
1473 if (err != 0)
1474 goto stderr_out;
1475
1476 /* write end record */
1477 bzero(&drr, sizeof (drr));
1478 drr.drr_type = DRR_END;
1479 drr.drr_u.drr_end.drr_checksum = zc;
1480 err = write(outfd, &drr, sizeof (drr));
1481 if (err == -1) {
1482 err = errno;
1483 goto stderr_out;
1484 }
1485
1486 err = 0;
1487 }
1488 }
1489
1490 /* dump each stream */
1491 sdd.fromsnap = fromsnap;
1492 sdd.tosnap = tosnap;
1493 if (tid != 0)
1494 sdd.outfd = pipefd[0];
1495 else
1496 sdd.outfd = outfd;
1497 sdd.replicate = flags->replicate;
1498 sdd.doall = flags->doall;
1499 sdd.fromorigin = flags->fromorigin;
1500 sdd.fss = fss;
1501 sdd.fsavl = fsavl;
1502 sdd.verbose = flags->verbose;
1503 sdd.parsable = flags->parsable;
1504 sdd.progress = flags->progress;
1505 sdd.dryrun = flags->dryrun;
1506 sdd.large_block = flags->largeblock;
1507 sdd.embed_data = flags->embed_data;
1508 sdd.filter_cb = filter_func;
1509 sdd.filter_cb_arg = cb_arg;
1510 if (debugnvp)
1511 sdd.debugnv = *debugnvp;
1512 if (sdd.verbose && sdd.dryrun)
1513 sdd.std_out = B_TRUE;
1514 fout = sdd.std_out ? stdout : stderr;
1515
1516 /*
1517 * Some flags require that we place user holds on the datasets that are
1518 * being sent so they don't get destroyed during the send. We can skip
1519 * this step if the pool is imported read-only since the datasets cannot
1520 * be destroyed.
1521 */
1522 if (!flags->dryrun && !zpool_get_prop_int(zfs_get_pool_handle(zhp),
1523 ZPOOL_PROP_READONLY, NULL) &&
1524 zfs_spa_version(zhp, &spa_version) == 0 &&
1525 spa_version >= SPA_VERSION_USERREFS &&
1526 (flags->doall || flags->replicate)) {
1527 ++holdseq;
1528 (void) snprintf(sdd.holdtag, sizeof (sdd.holdtag),
1529 ".send-%d-%llu", getpid(), (u_longlong_t)holdseq);
1530 sdd.cleanup_fd = open(ZFS_DEV, O_RDWR|O_EXCL);
1531 if (sdd.cleanup_fd < 0) {
1532 err = errno;
1533 goto stderr_out;
1534 }
1535 sdd.snapholds = fnvlist_alloc();
1536 } else {
1537 sdd.cleanup_fd = -1;
1538 sdd.snapholds = NULL;
1539 }
1540 if (flags->verbose || sdd.snapholds != NULL) {
1541 /*
1542 * Do a verbose no-op dry run to get all the verbose output
1543 * or to gather snapshot hold's before generating any data,
1544 * then do a non-verbose real run to generate the streams.
1545 */
1546 sdd.dryrun = B_TRUE;
1547 err = dump_filesystems(zhp, &sdd);
1548
1549 if (err != 0)
1550 goto stderr_out;
1551
1552 if (flags->verbose) {
1553 if (flags->parsable) {
1554 (void) fprintf(fout, "size\t%llu\n",
1555 (longlong_t)sdd.size);
1556 } else {
1557 char buf[16];
1558 zfs_nicenum(sdd.size, buf, sizeof (buf));
1559 (void) fprintf(fout, dgettext(TEXT_DOMAIN,
1560 "total estimated size is %s\n"), buf);
1561 }
1562 }
1563
1564 /* Ensure no snaps found is treated as an error. */
1565 if (!sdd.seento) {
1566 err = ENOENT;
1567 goto err_out;
1568 }
1569
1570 /* Skip the second run if dryrun was requested. */
1571 if (flags->dryrun)
1572 goto err_out;
1573
1574 if (sdd.snapholds != NULL) {
1575 err = zfs_hold_nvl(zhp, sdd.cleanup_fd, sdd.snapholds);
1576 if (err != 0)
1577 goto stderr_out;
1578
1579 fnvlist_free(sdd.snapholds);
1580 sdd.snapholds = NULL;
1581 }
1582
1583 sdd.dryrun = B_FALSE;
1584 sdd.verbose = B_FALSE;
1585 }
1586
1587 err = dump_filesystems(zhp, &sdd);
1588 fsavl_destroy(fsavl);
1589 nvlist_free(fss);
1590
1591 /* Ensure no snaps found is treated as an error. */
1592 if (err == 0 && !sdd.seento)
1593 err = ENOENT;
1594
1595 if (tid != 0) {
1596 if (err != 0)
1597 (void) pthread_cancel(tid);
1598 (void) close(pipefd[0]);
1599 (void) pthread_join(tid, NULL);
1600 }
1601
1602 if (sdd.cleanup_fd != -1) {
1603 VERIFY(0 == close(sdd.cleanup_fd));
1604 sdd.cleanup_fd = -1;
1605 }
1606
1607 if (!flags->dryrun && (flags->replicate || flags->doall ||
1608 flags->props)) {
1609 /*
1610 * write final end record. NB: want to do this even if
1611 * there was some error, because it might not be totally
1612 * failed.
1613 */
1614 dmu_replay_record_t drr = { 0 };
1615 drr.drr_type = DRR_END;
1616 if (write(outfd, &drr, sizeof (drr)) == -1) {
1617 return (zfs_standard_error(zhp->zfs_hdl,
1618 errno, errbuf));
1619 }
1620 }
1621
1622 return (err || sdd.err);
1623
1624 stderr_out:
1625 err = zfs_standard_error(zhp->zfs_hdl, err, errbuf);
1626 err_out:
1627 fsavl_destroy(fsavl);
1628 nvlist_free(fss);
1629 fnvlist_free(sdd.snapholds);
1630
1631 if (sdd.cleanup_fd != -1)
1632 VERIFY(0 == close(sdd.cleanup_fd));
1633 if (tid != 0) {
1634 (void) pthread_cancel(tid);
1635 (void) close(pipefd[0]);
1636 (void) pthread_join(tid, NULL);
1637 }
1638 return (err);
1639 }
1640
1641 int
1642 zfs_send_one(zfs_handle_t *zhp, const char *from, int fd,
1643 enum lzc_send_flags flags)
1644 {
1645 int err;
1646 libzfs_handle_t *hdl = zhp->zfs_hdl;
1647
1648 char errbuf[1024];
1649 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
1650 "warning: cannot send '%s'"), zhp->zfs_name);
1651
1652 err = lzc_send(zhp->zfs_name, from, fd, flags);
1653 if (err != 0) {
1654 switch (errno) {
1655 case EXDEV:
1656 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1657 "not an earlier snapshot from the same fs"));
1658 return (zfs_error(hdl, EZFS_CROSSTARGET, errbuf));
1659
1660 case ENOENT:
1661 case ESRCH:
1662 if (lzc_exists(zhp->zfs_name)) {
1663 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1664 "incremental source (%s) does not exist"),
1665 from);
1666 }
1667 return (zfs_error(hdl, EZFS_NOENT, errbuf));
1668
1669 case EBUSY:
1670 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1671 "target is busy; if a filesystem, "
1672 "it must not be mounted"));
1673 return (zfs_error(hdl, EZFS_BUSY, errbuf));
1674
1675 case EDQUOT:
1676 case EFBIG:
1677 case EIO:
1678 case ENOLINK:
1679 case ENOSPC:
1680 case ENOSTR:
1681 case ENXIO:
1682 case EPIPE:
1683 case ERANGE:
1684 case EFAULT:
1685 case EROFS:
1686 zfs_error_aux(hdl, strerror(errno));
1687 return (zfs_error(hdl, EZFS_BADBACKUP, errbuf));
1688
1689 default:
1690 return (zfs_standard_error(hdl, errno, errbuf));
1691 }
1692 }
1693 return (err != 0);
1694 }
1695
1696 /*
1697 * Routines specific to "zfs recv"
1698 */
1699
1700 static int
1701 recv_read(libzfs_handle_t *hdl, int fd, void *buf, int ilen,
1702 boolean_t byteswap, zio_cksum_t *zc)
1703 {
1704 char *cp = buf;
1705 int rv;
1706 int len = ilen;
1707
1708 assert(ilen <= SPA_MAXBLOCKSIZE);
1709
1710 do {
1711 rv = read(fd, cp, len);
1712 cp += rv;
1713 len -= rv;
1714 } while (rv > 0);
1715
1716 if (rv < 0 || len != 0) {
1717 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1718 "failed to read from stream"));
1719 return (zfs_error(hdl, EZFS_BADSTREAM, dgettext(TEXT_DOMAIN,
1720 "cannot receive")));
1721 }
1722
1723 if (zc) {
1724 if (byteswap)
1725 fletcher_4_incremental_byteswap(buf, ilen, zc);
1726 else
1727 fletcher_4_incremental_native(buf, ilen, zc);
1728 }
1729 return (0);
1730 }
1731
1732 static int
1733 recv_read_nvlist(libzfs_handle_t *hdl, int fd, int len, nvlist_t **nvp,
1734 boolean_t byteswap, zio_cksum_t *zc)
1735 {
1736 char *buf;
1737 int err;
1738
1739 buf = zfs_alloc(hdl, len);
1740 if (buf == NULL)
1741 return (ENOMEM);
1742
1743 err = recv_read(hdl, fd, buf, len, byteswap, zc);
1744 if (err != 0) {
1745 free(buf);
1746 return (err);
1747 }
1748
1749 err = nvlist_unpack(buf, len, nvp, 0);
1750 free(buf);
1751 if (err != 0) {
1752 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "invalid "
1753 "stream (malformed nvlist)"));
1754 return (EINVAL);
1755 }
1756 return (0);
1757 }
1758
1759 static int
1760 recv_rename(libzfs_handle_t *hdl, const char *name, const char *tryname,
1761 int baselen, char *newname, recvflags_t *flags)
1762 {
1763 static int seq;
1764 zfs_cmd_t zc = { 0 };
1765 int err;
1766 prop_changelist_t *clp;
1767 zfs_handle_t *zhp;
1768
1769 zhp = zfs_open(hdl, name, ZFS_TYPE_DATASET);
1770 if (zhp == NULL)
1771 return (-1);
1772 clp = changelist_gather(zhp, ZFS_PROP_NAME, 0,
1773 flags->force ? MS_FORCE : 0);
1774 zfs_close(zhp);
1775 if (clp == NULL)
1776 return (-1);
1777 err = changelist_prefix(clp);
1778 if (err)
1779 return (err);
1780
1781 zc.zc_objset_type = DMU_OST_ZFS;
1782 (void) strlcpy(zc.zc_name, name, sizeof (zc.zc_name));
1783
1784 if (tryname) {
1785 (void) strcpy(newname, tryname);
1786
1787 (void) strlcpy(zc.zc_value, tryname, sizeof (zc.zc_value));
1788
1789 if (flags->verbose) {
1790 (void) printf("attempting rename %s to %s\n",
1791 zc.zc_name, zc.zc_value);
1792 }
1793 err = ioctl(hdl->libzfs_fd, ZFS_IOC_RENAME, &zc);
1794 if (err == 0)
1795 changelist_rename(clp, name, tryname);
1796 } else {
1797 err = ENOENT;
1798 }
1799
1800 if (err != 0 && strncmp(name + baselen, "recv-", 5) != 0) {
1801 seq++;
1802
1803 (void) snprintf(newname, ZFS_MAXNAMELEN, "%.*srecv-%u-%u",
1804 baselen, name, getpid(), seq);
1805 (void) strlcpy(zc.zc_value, newname, sizeof (zc.zc_value));
1806
1807 if (flags->verbose) {
1808 (void) printf("failed - trying rename %s to %s\n",
1809 zc.zc_name, zc.zc_value);
1810 }
1811 err = ioctl(hdl->libzfs_fd, ZFS_IOC_RENAME, &zc);
1812 if (err == 0)
1813 changelist_rename(clp, name, newname);
1814 if (err && flags->verbose) {
1815 (void) printf("failed (%u) - "
1816 "will try again on next pass\n", errno);
1817 }
1818 err = EAGAIN;
1819 } else if (flags->verbose) {
1820 if (err == 0)
1821 (void) printf("success\n");
1822 else
1823 (void) printf("failed (%u)\n", errno);
1824 }
1825
1826 (void) changelist_postfix(clp);
1827 changelist_free(clp);
1828
1829 return (err);
1830 }
1831
1832 static int
1833 recv_destroy(libzfs_handle_t *hdl, const char *name, int baselen,
1834 char *newname, recvflags_t *flags)
1835 {
1836 zfs_cmd_t zc = { 0 };
1837 int err = 0;
1838 prop_changelist_t *clp;
1839 zfs_handle_t *zhp;
1840 boolean_t defer = B_FALSE;
1841 int spa_version;
1842
1843 zhp = zfs_open(hdl, name, ZFS_TYPE_DATASET);
1844 if (zhp == NULL)
1845 return (-1);
1846 clp = changelist_gather(zhp, ZFS_PROP_NAME, 0,
1847 flags->force ? MS_FORCE : 0);
1848 if (zfs_get_type(zhp) == ZFS_TYPE_SNAPSHOT &&
1849 zfs_spa_version(zhp, &spa_version) == 0 &&
1850 spa_version >= SPA_VERSION_USERREFS)
1851 defer = B_TRUE;
1852 zfs_close(zhp);
1853 if (clp == NULL)
1854 return (-1);
1855 err = changelist_prefix(clp);
1856 if (err)
1857 return (err);
1858
1859 zc.zc_objset_type = DMU_OST_ZFS;
1860 zc.zc_defer_destroy = defer;
1861 (void) strlcpy(zc.zc_name, name, sizeof (zc.zc_name));
1862
1863 if (flags->verbose)
1864 (void) printf("attempting destroy %s\n", zc.zc_name);
1865 err = ioctl(hdl->libzfs_fd, ZFS_IOC_DESTROY, &zc);
1866 if (err == 0) {
1867 if (flags->verbose)
1868 (void) printf("success\n");
1869 changelist_remove(clp, zc.zc_name);
1870 }
1871
1872 (void) changelist_postfix(clp);
1873 changelist_free(clp);
1874
1875 /*
1876 * Deferred destroy might destroy the snapshot or only mark it to be
1877 * destroyed later, and it returns success in either case.
1878 */
1879 if (err != 0 || (defer && zfs_dataset_exists(hdl, name,
1880 ZFS_TYPE_SNAPSHOT))) {
1881 err = recv_rename(hdl, name, NULL, baselen, newname, flags);
1882 }
1883
1884 return (err);
1885 }
1886
1887 typedef struct guid_to_name_data {
1888 uint64_t guid;
1889 char *name;
1890 char *skip;
1891 } guid_to_name_data_t;
1892
1893 static int
1894 guid_to_name_cb(zfs_handle_t *zhp, void *arg)
1895 {
1896 guid_to_name_data_t *gtnd = arg;
1897 int err;
1898
1899 if (gtnd->skip != NULL &&
1900 strcmp(zhp->zfs_name, gtnd->skip) == 0) {
1901 return (0);
1902 }
1903
1904 if (zhp->zfs_dmustats.dds_guid == gtnd->guid) {
1905 (void) strcpy(gtnd->name, zhp->zfs_name);
1906 zfs_close(zhp);
1907 return (EEXIST);
1908 }
1909
1910 err = zfs_iter_children(zhp, guid_to_name_cb, gtnd);
1911 zfs_close(zhp);
1912 return (err);
1913 }
1914
1915 /*
1916 * Attempt to find the local dataset associated with this guid. In the case of
1917 * multiple matches, we attempt to find the "best" match by searching
1918 * progressively larger portions of the hierarchy. This allows one to send a
1919 * tree of datasets individually and guarantee that we will find the source
1920 * guid within that hierarchy, even if there are multiple matches elsewhere.
1921 */
1922 static int
1923 guid_to_name(libzfs_handle_t *hdl, const char *parent, uint64_t guid,
1924 char *name)
1925 {
1926 /* exhaustive search all local snapshots */
1927 char pname[ZFS_MAXNAMELEN];
1928 guid_to_name_data_t gtnd;
1929 int err = 0;
1930 zfs_handle_t *zhp;
1931 char *cp;
1932
1933 gtnd.guid = guid;
1934 gtnd.name = name;
1935 gtnd.skip = NULL;
1936
1937 (void) strlcpy(pname, parent, sizeof (pname));
1938
1939 /*
1940 * Search progressively larger portions of the hierarchy. This will
1941 * select the "most local" version of the origin snapshot in the case
1942 * that there are multiple matching snapshots in the system.
1943 */
1944 while ((cp = strrchr(pname, '/')) != NULL) {
1945
1946 /* Chop off the last component and open the parent */
1947 *cp = '\0';
1948 zhp = make_dataset_handle(hdl, pname);
1949
1950 if (zhp == NULL)
1951 continue;
1952
1953 err = zfs_iter_children(zhp, guid_to_name_cb, >nd);
1954 zfs_close(zhp);
1955 if (err == EEXIST)
1956 return (0);
1957
1958 /*
1959 * Remember the dataset that we already searched, so we
1960 * skip it next time through.
1961 */
1962 gtnd.skip = pname;
1963 }
1964
1965 return (ENOENT);
1966 }
1967
1968 /*
1969 * Return +1 if guid1 is before guid2, 0 if they are the same, and -1 if
1970 * guid1 is after guid2.
1971 */
1972 static int
1973 created_before(libzfs_handle_t *hdl, avl_tree_t *avl,
1974 uint64_t guid1, uint64_t guid2)
1975 {
1976 nvlist_t *nvfs;
1977 char *fsname, *snapname;
1978 char buf[ZFS_MAXNAMELEN];
1979 int rv;
1980 zfs_handle_t *guid1hdl, *guid2hdl;
1981 uint64_t create1, create2;
1982
1983 if (guid2 == 0)
1984 return (0);
1985 if (guid1 == 0)
1986 return (1);
1987
1988 nvfs = fsavl_find(avl, guid1, &snapname);
1989 VERIFY(0 == nvlist_lookup_string(nvfs, "name", &fsname));
1990 (void) snprintf(buf, sizeof (buf), "%s@%s", fsname, snapname);
1991 guid1hdl = zfs_open(hdl, buf, ZFS_TYPE_SNAPSHOT);
1992 if (guid1hdl == NULL)
1993 return (-1);
1994
1995 nvfs = fsavl_find(avl, guid2, &snapname);
1996 VERIFY(0 == nvlist_lookup_string(nvfs, "name", &fsname));
1997 (void) snprintf(buf, sizeof (buf), "%s@%s", fsname, snapname);
1998 guid2hdl = zfs_open(hdl, buf, ZFS_TYPE_SNAPSHOT);
1999 if (guid2hdl == NULL) {
2000 zfs_close(guid1hdl);
2001 return (-1);
2002 }
2003
2004 create1 = zfs_prop_get_int(guid1hdl, ZFS_PROP_CREATETXG);
2005 create2 = zfs_prop_get_int(guid2hdl, ZFS_PROP_CREATETXG);
2006
2007 if (create1 < create2)
2008 rv = -1;
2009 else if (create1 > create2)
2010 rv = +1;
2011 else
2012 rv = 0;
2013
2014 zfs_close(guid1hdl);
2015 zfs_close(guid2hdl);
2016
2017 return (rv);
2018 }
2019
2020 static int
2021 recv_incremental_replication(libzfs_handle_t *hdl, const char *tofs,
2022 recvflags_t *flags, nvlist_t *stream_nv, avl_tree_t *stream_avl,
2023 nvlist_t *renamed)
2024 {
2025 nvlist_t *local_nv;
2026 avl_tree_t *local_avl;
2027 nvpair_t *fselem, *nextfselem;
2028 char *fromsnap;
2029 char newname[ZFS_MAXNAMELEN];
2030 int error;
2031 boolean_t needagain, progress, recursive;
2032 char *s1, *s2;
2033
2034 VERIFY(0 == nvlist_lookup_string(stream_nv, "fromsnap", &fromsnap));
2035
2036 recursive = (nvlist_lookup_boolean(stream_nv, "not_recursive") ==
2037 ENOENT);
2038
2039 if (flags->dryrun)
2040 return (0);
2041
2042 again:
2043 needagain = progress = B_FALSE;
2044
2045 if ((error = gather_nvlist(hdl, tofs, fromsnap, NULL,
2046 recursive, &local_nv, &local_avl)) != 0)
2047 return (error);
2048
2049 /*
2050 * Process deletes and renames
2051 */
2052 for (fselem = nvlist_next_nvpair(local_nv, NULL);
2053 fselem; fselem = nextfselem) {
2054 nvlist_t *nvfs, *snaps;
2055 nvlist_t *stream_nvfs = NULL;
2056 nvpair_t *snapelem, *nextsnapelem;
2057 uint64_t fromguid = 0;
2058 uint64_t originguid = 0;
2059 uint64_t stream_originguid = 0;
2060 uint64_t parent_fromsnap_guid, stream_parent_fromsnap_guid;
2061 char *fsname, *stream_fsname;
2062
2063 nextfselem = nvlist_next_nvpair(local_nv, fselem);
2064
2065 VERIFY(0 == nvpair_value_nvlist(fselem, &nvfs));
2066 VERIFY(0 == nvlist_lookup_nvlist(nvfs, "snaps", &snaps));
2067 VERIFY(0 == nvlist_lookup_string(nvfs, "name", &fsname));
2068 VERIFY(0 == nvlist_lookup_uint64(nvfs, "parentfromsnap",
2069 &parent_fromsnap_guid));
2070 (void) nvlist_lookup_uint64(nvfs, "origin", &originguid);
2071
2072 /*
2073 * First find the stream's fs, so we can check for
2074 * a different origin (due to "zfs promote")
2075 */
2076 for (snapelem = nvlist_next_nvpair(snaps, NULL);
2077 snapelem; snapelem = nvlist_next_nvpair(snaps, snapelem)) {
2078 uint64_t thisguid;
2079
2080 VERIFY(0 == nvpair_value_uint64(snapelem, &thisguid));
2081 stream_nvfs = fsavl_find(stream_avl, thisguid, NULL);
2082
2083 if (stream_nvfs != NULL)
2084 break;
2085 }
2086
2087 /* check for promote */
2088 (void) nvlist_lookup_uint64(stream_nvfs, "origin",
2089 &stream_originguid);
2090 if (stream_nvfs && originguid != stream_originguid) {
2091 switch (created_before(hdl, local_avl,
2092 stream_originguid, originguid)) {
2093 case 1: {
2094 /* promote it! */
2095 zfs_cmd_t zc = { 0 };
2096 nvlist_t *origin_nvfs;
2097 char *origin_fsname;
2098
2099 if (flags->verbose)
2100 (void) printf("promoting %s\n", fsname);
2101
2102 origin_nvfs = fsavl_find(local_avl, originguid,
2103 NULL);
2104 VERIFY(0 == nvlist_lookup_string(origin_nvfs,
2105 "name", &origin_fsname));
2106 (void) strlcpy(zc.zc_value, origin_fsname,
2107 sizeof (zc.zc_value));
2108 (void) strlcpy(zc.zc_name, fsname,
2109 sizeof (zc.zc_name));
2110 error = zfs_ioctl(hdl, ZFS_IOC_PROMOTE, &zc);
2111 if (error == 0)
2112 progress = B_TRUE;
2113 break;
2114 }
2115 default:
2116 break;
2117 case -1:
2118 fsavl_destroy(local_avl);
2119 nvlist_free(local_nv);
2120 return (-1);
2121 }
2122 /*
2123 * We had/have the wrong origin, therefore our
2124 * list of snapshots is wrong. Need to handle
2125 * them on the next pass.
2126 */
2127 needagain = B_TRUE;
2128 continue;
2129 }
2130
2131 for (snapelem = nvlist_next_nvpair(snaps, NULL);
2132 snapelem; snapelem = nextsnapelem) {
2133 uint64_t thisguid;
2134 char *stream_snapname;
2135 nvlist_t *found, *props;
2136
2137 nextsnapelem = nvlist_next_nvpair(snaps, snapelem);
2138
2139 VERIFY(0 == nvpair_value_uint64(snapelem, &thisguid));
2140 found = fsavl_find(stream_avl, thisguid,
2141 &stream_snapname);
2142
2143 /* check for delete */
2144 if (found == NULL) {
2145 char name[ZFS_MAXNAMELEN];
2146
2147 if (!flags->force)
2148 continue;
2149
2150 (void) snprintf(name, sizeof (name), "%s@%s",
2151 fsname, nvpair_name(snapelem));
2152
2153 error = recv_destroy(hdl, name,
2154 strlen(fsname)+1, newname, flags);
2155 if (error)
2156 needagain = B_TRUE;
2157 else
2158 progress = B_TRUE;
2159 continue;
2160 }
2161
2162 stream_nvfs = found;
2163
2164 if (0 == nvlist_lookup_nvlist(stream_nvfs, "snapprops",
2165 &props) && 0 == nvlist_lookup_nvlist(props,
2166 stream_snapname, &props)) {
2167 zfs_cmd_t zc = { 0 };
2168
2169 zc.zc_cookie = B_TRUE; /* received */
2170 (void) snprintf(zc.zc_name, sizeof (zc.zc_name),
2171 "%s@%s", fsname, nvpair_name(snapelem));
2172 if (zcmd_write_src_nvlist(hdl, &zc,
2173 props) == 0) {
2174 (void) zfs_ioctl(hdl,
2175 ZFS_IOC_SET_PROP, &zc);
2176 zcmd_free_nvlists(&zc);
2177 }
2178 }
2179
2180 /* check for different snapname */
2181 if (strcmp(nvpair_name(snapelem),
2182 stream_snapname) != 0) {
2183 char name[ZFS_MAXNAMELEN];
2184 char tryname[ZFS_MAXNAMELEN];
2185
2186 (void) snprintf(name, sizeof (name), "%s@%s",
2187 fsname, nvpair_name(snapelem));
2188 (void) snprintf(tryname, sizeof (name), "%s@%s",
2189 fsname, stream_snapname);
2190
2191 error = recv_rename(hdl, name, tryname,
2192 strlen(fsname)+1, newname, flags);
2193 if (error)
2194 needagain = B_TRUE;
2195 else
2196 progress = B_TRUE;
2197 }
2198
2199 if (strcmp(stream_snapname, fromsnap) == 0)
2200 fromguid = thisguid;
2201 }
2202
2203 /* check for delete */
2204 if (stream_nvfs == NULL) {
2205 if (!flags->force)
2206 continue;
2207
2208 error = recv_destroy(hdl, fsname, strlen(tofs)+1,
2209 newname, flags);
2210 if (error)
2211 needagain = B_TRUE;
2212 else
2213 progress = B_TRUE;
2214 continue;
2215 }
2216
2217 if (fromguid == 0) {
2218 if (flags->verbose) {
2219 (void) printf("local fs %s does not have "
2220 "fromsnap (%s in stream); must have "
2221 "been deleted locally; ignoring\n",
2222 fsname, fromsnap);
2223 }
2224 continue;
2225 }
2226
2227 VERIFY(0 == nvlist_lookup_string(stream_nvfs,
2228 "name", &stream_fsname));
2229 VERIFY(0 == nvlist_lookup_uint64(stream_nvfs,
2230 "parentfromsnap", &stream_parent_fromsnap_guid));
2231
2232 s1 = strrchr(fsname, '/');
2233 s2 = strrchr(stream_fsname, '/');
2234
2235 /*
2236 * Check for rename. If the exact receive path is specified, it
2237 * does not count as a rename, but we still need to check the
2238 * datasets beneath it.
2239 */
2240 if ((stream_parent_fromsnap_guid != 0 &&
2241 parent_fromsnap_guid != 0 &&
2242 stream_parent_fromsnap_guid != parent_fromsnap_guid) ||
2243 ((flags->isprefix || strcmp(tofs, fsname) != 0) &&
2244 (s1 != NULL) && (s2 != NULL) && strcmp(s1, s2) != 0)) {
2245 nvlist_t *parent;
2246 char tryname[ZFS_MAXNAMELEN];
2247
2248 parent = fsavl_find(local_avl,
2249 stream_parent_fromsnap_guid, NULL);
2250 /*
2251 * NB: parent might not be found if we used the
2252 * tosnap for stream_parent_fromsnap_guid,
2253 * because the parent is a newly-created fs;
2254 * we'll be able to rename it after we recv the
2255 * new fs.
2256 */
2257 if (parent != NULL) {
2258 char *pname;
2259
2260 VERIFY(0 == nvlist_lookup_string(parent, "name",
2261 &pname));
2262 (void) snprintf(tryname, sizeof (tryname),
2263 "%s%s", pname, strrchr(stream_fsname, '/'));
2264 } else {
2265 tryname[0] = '\0';
2266 if (flags->verbose) {
2267 (void) printf("local fs %s new parent "
2268 "not found\n", fsname);
2269 }
2270 }
2271
2272 newname[0] = '\0';
2273
2274 error = recv_rename(hdl, fsname, tryname,
2275 strlen(tofs)+1, newname, flags);
2276
2277 if (renamed != NULL && newname[0] != '\0') {
2278 VERIFY(0 == nvlist_add_boolean(renamed,
2279 newname));
2280 }
2281
2282 if (error)
2283 needagain = B_TRUE;
2284 else
2285 progress = B_TRUE;
2286 }
2287 }
2288
2289 fsavl_destroy(local_avl);
2290 nvlist_free(local_nv);
2291
2292 if (needagain && progress) {
2293 /* do another pass to fix up temporary names */
2294 if (flags->verbose)
2295 (void) printf("another pass:\n");
2296 goto again;
2297 }
2298
2299 return (needagain);
2300 }
2301
2302 static int
2303 zfs_receive_package(libzfs_handle_t *hdl, int fd, const char *destname,
2304 recvflags_t *flags, dmu_replay_record_t *drr, zio_cksum_t *zc,
2305 char **top_zfs, int cleanup_fd, uint64_t *action_handlep)
2306 {
2307 nvlist_t *stream_nv = NULL;
2308 avl_tree_t *stream_avl = NULL;
2309 char *fromsnap = NULL;
2310 char *sendsnap = NULL;
2311 char *cp;
2312 char tofs[ZFS_MAXNAMELEN];
2313 char sendfs[ZFS_MAXNAMELEN];
2314 char errbuf[1024];
2315 dmu_replay_record_t drre;
2316 int error;
2317 boolean_t anyerr = B_FALSE;
2318 boolean_t softerr = B_FALSE;
2319 boolean_t recursive;
2320
2321 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
2322 "cannot receive"));
2323
2324 assert(drr->drr_type == DRR_BEGIN);
2325 assert(drr->drr_u.drr_begin.drr_magic == DMU_BACKUP_MAGIC);
2326 assert(DMU_GET_STREAM_HDRTYPE(drr->drr_u.drr_begin.drr_versioninfo) ==
2327 DMU_COMPOUNDSTREAM);
2328
2329 /*
2330 * Read in the nvlist from the stream.
2331 */
2332 if (drr->drr_payloadlen != 0) {
2333 error = recv_read_nvlist(hdl, fd, drr->drr_payloadlen,
2334 &stream_nv, flags->byteswap, zc);
2335 if (error) {
2336 error = zfs_error(hdl, EZFS_BADSTREAM, errbuf);
2337 goto out;
2338 }
2339 }
2340
2341 recursive = (nvlist_lookup_boolean(stream_nv, "not_recursive") ==
2342 ENOENT);
2343
2344 if (recursive && strchr(destname, '@')) {
2345 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
2346 "cannot specify snapshot name for multi-snapshot stream"));
2347 error = zfs_error(hdl, EZFS_BADSTREAM, errbuf);
2348 goto out;
2349 }
2350
2351 /*
2352 * Read in the end record and verify checksum.
2353 */
2354 if (0 != (error = recv_read(hdl, fd, &drre, sizeof (drre),
2355 flags->byteswap, NULL)))
2356 goto out;
2357 if (flags->byteswap) {
2358 drre.drr_type = BSWAP_32(drre.drr_type);
2359 drre.drr_u.drr_end.drr_checksum.zc_word[0] =
2360 BSWAP_64(drre.drr_u.drr_end.drr_checksum.zc_word[0]);
2361 drre.drr_u.drr_end.drr_checksum.zc_word[1] =
2362 BSWAP_64(drre.drr_u.drr_end.drr_checksum.zc_word[1]);
2363 drre.drr_u.drr_end.drr_checksum.zc_word[2] =
2364 BSWAP_64(drre.drr_u.drr_end.drr_checksum.zc_word[2]);
2365 drre.drr_u.drr_end.drr_checksum.zc_word[3] =
2366 BSWAP_64(drre.drr_u.drr_end.drr_checksum.zc_word[3]);
2367 }
2368 if (drre.drr_type != DRR_END) {
2369 error = zfs_error(hdl, EZFS_BADSTREAM, errbuf);
2370 goto out;
2371 }
2372 if (!ZIO_CHECKSUM_EQUAL(drre.drr_u.drr_end.drr_checksum, *zc)) {
2373 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
2374 "incorrect header checksum"));
2375 error = zfs_error(hdl, EZFS_BADSTREAM, errbuf);
2376 goto out;
2377 }
2378
2379 (void) nvlist_lookup_string(stream_nv, "fromsnap", &fromsnap);
2380
2381 if (drr->drr_payloadlen != 0) {
2382 nvlist_t *stream_fss;
2383
2384 VERIFY(0 == nvlist_lookup_nvlist(stream_nv, "fss",
2385 &stream_fss));
2386 if ((stream_avl = fsavl_create(stream_fss)) == NULL) {
2387 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
2388 "couldn't allocate avl tree"));
2389 error = zfs_error(hdl, EZFS_NOMEM, errbuf);
2390 goto out;
2391 }
2392
2393 if (fromsnap != NULL) {
2394 nvlist_t *renamed = NULL;
2395 nvpair_t *pair = NULL;
2396
2397 (void) strlcpy(tofs, destname, ZFS_MAXNAMELEN);
2398 if (flags->isprefix) {
2399 struct drr_begin *drrb = &drr->drr_u.drr_begin;
2400 int i;
2401
2402 if (flags->istail) {
2403 cp = strrchr(drrb->drr_toname, '/');
2404 if (cp == NULL) {
2405 (void) strlcat(tofs, "/",
2406 ZFS_MAXNAMELEN);
2407 i = 0;
2408 } else {
2409 i = (cp - drrb->drr_toname);
2410 }
2411 } else {
2412 i = strcspn(drrb->drr_toname, "/@");
2413 }
2414 /* zfs_receive_one() will create_parents() */
2415 (void) strlcat(tofs, &drrb->drr_toname[i],
2416 ZFS_MAXNAMELEN);
2417 *strchr(tofs, '@') = '\0';
2418 }
2419
2420 if (recursive && !flags->dryrun && !flags->nomount) {
2421 VERIFY(0 == nvlist_alloc(&renamed,
2422 NV_UNIQUE_NAME, 0));
2423 }
2424
2425 softerr = recv_incremental_replication(hdl, tofs, flags,
2426 stream_nv, stream_avl, renamed);
2427
2428 /* Unmount renamed filesystems before receiving. */
2429 while ((pair = nvlist_next_nvpair(renamed,
2430 pair)) != NULL) {
2431 zfs_handle_t *zhp;
2432 prop_changelist_t *clp = NULL;
2433
2434 zhp = zfs_open(hdl, nvpair_name(pair),
2435 ZFS_TYPE_FILESYSTEM);
2436 if (zhp != NULL) {
2437 clp = changelist_gather(zhp,
2438 ZFS_PROP_MOUNTPOINT, 0, 0);
2439 zfs_close(zhp);
2440 if (clp != NULL) {
2441 softerr |=
2442 changelist_prefix(clp);
2443 changelist_free(clp);
2444 }
2445 }
2446 }
2447
2448 nvlist_free(renamed);
2449 }
2450 }
2451
2452 /*
2453 * Get the fs specified by the first path in the stream (the top level
2454 * specified by 'zfs send') and pass it to each invocation of
2455 * zfs_receive_one().
2456 */
2457 (void) strlcpy(sendfs, drr->drr_u.drr_begin.drr_toname,
2458 ZFS_MAXNAMELEN);
2459 if ((cp = strchr(sendfs, '@')) != NULL) {
2460 *cp = '\0';
2461 /*
2462 * Find the "sendsnap", the final snapshot in a replication
2463 * stream. zfs_receive_one() handles certain errors
2464 * differently, depending on if the contained stream is the
2465 * last one or not.
2466 */
2467 sendsnap = (cp + 1);
2468 }
2469
2470 /* Finally, receive each contained stream */
2471 do {
2472 /*
2473 * we should figure out if it has a recoverable
2474 * error, in which case do a recv_skip() and drive on.
2475 * Note, if we fail due to already having this guid,
2476 * zfs_receive_one() will take care of it (ie,
2477 * recv_skip() and return 0).
2478 */
2479 error = zfs_receive_impl(hdl, destname, flags, fd,
2480 sendfs, stream_nv, stream_avl, top_zfs, cleanup_fd,
2481 action_handlep, sendsnap);
2482 if (error == ENODATA) {
2483 error = 0;
2484 break;
2485 }
2486 anyerr |= error;
2487 } while (error == 0);
2488
2489 if (drr->drr_payloadlen != 0 && fromsnap != NULL) {
2490 /*
2491 * Now that we have the fs's they sent us, try the
2492 * renames again.
2493 */
2494 softerr = recv_incremental_replication(hdl, tofs, flags,
2495 stream_nv, stream_avl, NULL);
2496 }
2497
2498 out:
2499 fsavl_destroy(stream_avl);
2500 if (stream_nv)
2501 nvlist_free(stream_nv);
2502 if (softerr)
2503 error = -2;
2504 if (anyerr)
2505 error = -1;
2506 return (error);
2507 }
2508
2509 static void
2510 trunc_prop_errs(int truncated)
2511 {
2512 ASSERT(truncated != 0);
2513
2514 if (truncated == 1)
2515 (void) fprintf(stderr, dgettext(TEXT_DOMAIN,
2516 "1 more property could not be set\n"));
2517 else
2518 (void) fprintf(stderr, dgettext(TEXT_DOMAIN,
2519 "%d more properties could not be set\n"), truncated);
2520 }
2521
2522 static int
2523 recv_skip(libzfs_handle_t *hdl, int fd, boolean_t byteswap)
2524 {
2525 dmu_replay_record_t *drr;
2526 void *buf = zfs_alloc(hdl, SPA_MAXBLOCKSIZE);
2527 char errbuf[1024];
2528
2529 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
2530 "cannot receive:"));
2531
2532 /* XXX would be great to use lseek if possible... */
2533 drr = buf;
2534
2535 while (recv_read(hdl, fd, drr, sizeof (dmu_replay_record_t),
2536 byteswap, NULL) == 0) {
2537 if (byteswap)
2538 drr->drr_type = BSWAP_32(drr->drr_type);
2539
2540 switch (drr->drr_type) {
2541 case DRR_BEGIN:
2542 /* NB: not to be used on v2 stream packages */
2543 if (drr->drr_payloadlen != 0) {
2544 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
2545 "invalid substream header"));
2546 return (zfs_error(hdl, EZFS_BADSTREAM, errbuf));
2547 }
2548 break;
2549
2550 case DRR_END:
2551 free(buf);
2552 return (0);
2553
2554 case DRR_OBJECT:
2555 if (byteswap) {
2556 drr->drr_u.drr_object.drr_bonuslen =
2557 BSWAP_32(drr->drr_u.drr_object.
2558 drr_bonuslen);
2559 }
2560 (void) recv_read(hdl, fd, buf,
2561 P2ROUNDUP(drr->drr_u.drr_object.drr_bonuslen, 8),
2562 B_FALSE, NULL);
2563 break;
2564
2565 case DRR_WRITE:
2566 if (byteswap) {
2567 drr->drr_u.drr_write.drr_length =
2568 BSWAP_64(drr->drr_u.drr_write.drr_length);
2569 }
2570 (void) recv_read(hdl, fd, buf,
2571 drr->drr_u.drr_write.drr_length, B_FALSE, NULL);
2572 break;
2573 case DRR_SPILL:
2574 if (byteswap) {
2575 drr->drr_u.drr_write.drr_length =
2576 BSWAP_64(drr->drr_u.drr_spill.drr_length);
2577 }
2578 (void) recv_read(hdl, fd, buf,
2579 drr->drr_u.drr_spill.drr_length, B_FALSE, NULL);
2580 break;
2581 case DRR_WRITE_EMBEDDED:
2582 if (byteswap) {
2583 drr->drr_u.drr_write_embedded.drr_psize =
2584 BSWAP_32(drr->drr_u.drr_write_embedded.
2585 drr_psize);
2586 }
2587 (void) recv_read(hdl, fd, buf,
2588 P2ROUNDUP(drr->drr_u.drr_write_embedded.drr_psize,
2589 8), B_FALSE, NULL);
2590 break;
2591 case DRR_WRITE_BYREF:
2592 case DRR_FREEOBJECTS:
2593 case DRR_FREE:
2594 break;
2595
2596 default:
2597 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
2598 "invalid record type"));
2599 return (zfs_error(hdl, EZFS_BADSTREAM, errbuf));
2600 }
2601 }
2602
2603 free(buf);
2604 return (-1);
2605 }
2606
2607 /*
2608 * Restores a backup of tosnap from the file descriptor specified by infd.
2609 */
2610 static int
2611 zfs_receive_one(libzfs_handle_t *hdl, int infd, const char *tosnap,
2612 recvflags_t *flags, dmu_replay_record_t *drr,
2613 dmu_replay_record_t *drr_noswap, const char *sendfs,
2614 nvlist_t *stream_nv, avl_tree_t *stream_avl, char **top_zfs, int cleanup_fd,
2615 uint64_t *action_handlep, const char *finalsnap)
2616 {
2617 zfs_cmd_t zc = { 0 };
2618 time_t begin_time;
2619 int ioctl_err, ioctl_errno, err;
2620 char *cp;
2621 struct drr_begin *drrb = &drr->drr_u.drr_begin;
2622 char errbuf[1024];
2623 char prop_errbuf[1024];
2624 const char *chopprefix;
2625 boolean_t newfs = B_FALSE;
2626 boolean_t stream_wantsnewfs;
2627 uint64_t parent_snapguid = 0;
2628 prop_changelist_t *clp = NULL;
2629 nvlist_t *snapprops_nvlist = NULL;
2630 zprop_errflags_t prop_errflags;
2631 boolean_t recursive;
2632 char *snapname = NULL;
2633
2634 begin_time = time(NULL);
2635
2636 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
2637 "cannot receive"));
2638
2639 recursive = (nvlist_lookup_boolean(stream_nv, "not_recursive") ==
2640 ENOENT);
2641
2642 if (stream_avl != NULL) {
2643 nvlist_t *fs = fsavl_find(stream_avl, drrb->drr_toguid,
2644 &snapname);
2645 nvlist_t *props;
2646 int ret;
2647
2648 (void) nvlist_lookup_uint64(fs, "parentfromsnap",
2649 &parent_snapguid);
2650 err = nvlist_lookup_nvlist(fs, "props", &props);
2651 if (err)
2652 VERIFY(0 == nvlist_alloc(&props, NV_UNIQUE_NAME, 0));
2653
2654 if (flags->canmountoff) {
2655 VERIFY(0 == nvlist_add_uint64(props,
2656 zfs_prop_to_name(ZFS_PROP_CANMOUNT), 0));
2657 }
2658 ret = zcmd_write_src_nvlist(hdl, &zc, props);
2659 if (err)
2660 nvlist_free(props);
2661
2662 if (0 == nvlist_lookup_nvlist(fs, "snapprops", &props)) {
2663 VERIFY(0 == nvlist_lookup_nvlist(props,
2664 snapname, &snapprops_nvlist));
2665 }
2666
2667 if (ret != 0)
2668 return (-1);
2669 }
2670
2671 cp = NULL;
2672
2673 /*
2674 * Determine how much of the snapshot name stored in the stream
2675 * we are going to tack on to the name they specified on the
2676 * command line, and how much we are going to chop off.
2677 *
2678 * If they specified a snapshot, chop the entire name stored in
2679 * the stream.
2680 */
2681 if (flags->istail) {
2682 /*
2683 * A filesystem was specified with -e. We want to tack on only
2684 * the tail of the sent snapshot path.
2685 */
2686 if (strchr(tosnap, '@')) {
2687 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "invalid "
2688 "argument - snapshot not allowed with -e"));
2689 return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf));
2690 }
2691
2692 chopprefix = strrchr(sendfs, '/');
2693
2694 if (chopprefix == NULL) {
2695 /*
2696 * The tail is the poolname, so we need to
2697 * prepend a path separator.
2698 */
2699 int len = strlen(drrb->drr_toname);
2700 cp = malloc(len + 2);
2701 cp[0] = '/';
2702 (void) strcpy(&cp[1], drrb->drr_toname);
2703 chopprefix = cp;
2704 } else {
2705 chopprefix = drrb->drr_toname + (chopprefix - sendfs);
2706 }
2707 } else if (flags->isprefix) {
2708 /*
2709 * A filesystem was specified with -d. We want to tack on
2710 * everything but the first element of the sent snapshot path
2711 * (all but the pool name).
2712 */
2713 if (strchr(tosnap, '@')) {
2714 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "invalid "
2715 "argument - snapshot not allowed with -d"));
2716 return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf));
2717 }
2718
2719 chopprefix = strchr(drrb->drr_toname, '/');
2720 if (chopprefix == NULL)
2721 chopprefix = strchr(drrb->drr_toname, '@');
2722 } else if (strchr(tosnap, '@') == NULL) {
2723 /*
2724 * If a filesystem was specified without -d or -e, we want to
2725 * tack on everything after the fs specified by 'zfs send'.
2726 */
2727 chopprefix = drrb->drr_toname + strlen(sendfs);
2728 } else {
2729 /* A snapshot was specified as an exact path (no -d or -e). */
2730 if (recursive) {
2731 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
2732 "cannot specify snapshot name for multi-snapshot "
2733 "stream"));
2734 return (zfs_error(hdl, EZFS_BADSTREAM, errbuf));
2735 }
2736 chopprefix = drrb->drr_toname + strlen(drrb->drr_toname);
2737 }
2738
2739 ASSERT(strstr(drrb->drr_toname, sendfs) == drrb->drr_toname);
2740 ASSERT(chopprefix > drrb->drr_toname);
2741 ASSERT(chopprefix <= drrb->drr_toname + strlen(drrb->drr_toname));
2742 ASSERT(chopprefix[0] == '/' || chopprefix[0] == '@' ||
2743 chopprefix[0] == '\0');
2744
2745 /*
2746 * Determine name of destination snapshot, store in zc_value.
2747 */
2748 (void) strcpy(zc.zc_value, tosnap);
2749 (void) strncat(zc.zc_value, chopprefix, sizeof (zc.zc_value));
2750 free(cp);
2751 if (!zfs_name_valid(zc.zc_value, ZFS_TYPE_SNAPSHOT)) {
2752 zcmd_free_nvlists(&zc);
2753 return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf));
2754 }
2755
2756 /*
2757 * Determine the name of the origin snapshot, store in zc_string.
2758 */
2759 if (drrb->drr_flags & DRR_FLAG_CLONE) {
2760 if (guid_to_name(hdl, zc.zc_value,
2761 drrb->drr_fromguid, zc.zc_string) != 0) {
2762 zcmd_free_nvlists(&zc);
2763 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
2764 "local origin for clone %s does not exist"),
2765 zc.zc_value);
2766 return (zfs_error(hdl, EZFS_NOENT, errbuf));
2767 }
2768 if (flags->verbose)
2769 (void) printf("found clone origin %s\n", zc.zc_string);
2770 }
2771
2772 stream_wantsnewfs = (drrb->drr_fromguid == NULL ||
2773 (drrb->drr_flags & DRR_FLAG_CLONE));
2774
2775 if (stream_wantsnewfs) {
2776 /*
2777 * if the parent fs does not exist, look for it based on
2778 * the parent snap GUID
2779 */
2780 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
2781 "cannot receive new filesystem stream"));
2782
2783 (void) strcpy(zc.zc_name, zc.zc_value);
2784 cp = strrchr(zc.zc_name, '/');
2785 if (cp)
2786 *cp = '\0';
2787 if (cp &&
2788 !zfs_dataset_exists(hdl, zc.zc_name, ZFS_TYPE_DATASET)) {
2789 char suffix[ZFS_MAXNAMELEN];
2790 (void) strcpy(suffix, strrchr(zc.zc_value, '/'));
2791 if (guid_to_name(hdl, zc.zc_name, parent_snapguid,
2792 zc.zc_value) == 0) {
2793 *strchr(zc.zc_value, '@') = '\0';
2794 (void) strcat(zc.zc_value, suffix);
2795 }
2796 }
2797 } else {
2798 /*
2799 * if the fs does not exist, look for it based on the
2800 * fromsnap GUID
2801 */
2802 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
2803 "cannot receive incremental stream"));
2804
2805 (void) strcpy(zc.zc_name, zc.zc_value);
2806 *strchr(zc.zc_name, '@') = '\0';
2807
2808 /*
2809 * If the exact receive path was specified and this is the
2810 * topmost path in the stream, then if the fs does not exist we
2811 * should look no further.
2812 */
2813 if ((flags->isprefix || (*(chopprefix = drrb->drr_toname +
2814 strlen(sendfs)) != '\0' && *chopprefix != '@')) &&
2815 !zfs_dataset_exists(hdl, zc.zc_name, ZFS_TYPE_DATASET)) {
2816 char snap[ZFS_MAXNAMELEN];
2817 (void) strcpy(snap, strchr(zc.zc_value, '@'));
2818 if (guid_to_name(hdl, zc.zc_name, drrb->drr_fromguid,
2819 zc.zc_value) == 0) {
2820 *strchr(zc.zc_value, '@') = '\0';
2821 (void) strcat(zc.zc_value, snap);
2822 }
2823 }
2824 }
2825
2826 (void) strcpy(zc.zc_name, zc.zc_value);
2827 *strchr(zc.zc_name, '@') = '\0';
2828
2829 if (zfs_dataset_exists(hdl, zc.zc_name, ZFS_TYPE_DATASET)) {
2830 zfs_handle_t *zhp;
2831
2832 /*
2833 * Destination fs exists. Therefore this should either
2834 * be an incremental, or the stream specifies a new fs
2835 * (full stream or clone) and they want us to blow it
2836 * away (and have therefore specified -F and removed any
2837 * snapshots).
2838 */
2839 if (stream_wantsnewfs) {
2840 if (!flags->force) {
2841 zcmd_free_nvlists(&zc);
2842 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
2843 "destination '%s' exists\n"
2844 "must specify -F to overwrite it"),
2845 zc.zc_name);
2846 return (zfs_error(hdl, EZFS_EXISTS, errbuf));
2847 }
2848 if (ioctl(hdl->libzfs_fd, ZFS_IOC_SNAPSHOT_LIST_NEXT,
2849 &zc) == 0) {
2850 zcmd_free_nvlists(&zc);
2851 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
2852 "destination has snapshots (eg. %s)\n"
2853 "must destroy them to overwrite it"),
2854 zc.zc_name);
2855 return (zfs_error(hdl, EZFS_EXISTS, errbuf));
2856 }
2857 }
2858
2859 if ((zhp = zfs_open(hdl, zc.zc_name,
2860 ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME)) == NULL) {
2861 zcmd_free_nvlists(&zc);
2862 return (-1);
2863 }
2864
2865 if (stream_wantsnewfs &&
2866 zhp->zfs_dmustats.dds_origin[0]) {
2867 zcmd_free_nvlists(&zc);
2868 zfs_close(zhp);
2869 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
2870 "destination '%s' is a clone\n"
2871 "must destroy it to overwrite it"),
2872 zc.zc_name);
2873 return (zfs_error(hdl, EZFS_EXISTS, errbuf));
2874 }
2875
2876 if (!flags->dryrun && zhp->zfs_type == ZFS_TYPE_FILESYSTEM &&
2877 stream_wantsnewfs) {
2878 /* We can't do online recv in this case */
2879 clp = changelist_gather(zhp, ZFS_PROP_NAME, 0, 0);
2880 if (clp == NULL) {
2881 zfs_close(zhp);
2882 zcmd_free_nvlists(&zc);
2883 return (-1);
2884 }
2885 if (changelist_prefix(clp) != 0) {
2886 changelist_free(clp);
2887 zfs_close(zhp);
2888 zcmd_free_nvlists(&zc);
2889 return (-1);
2890 }
2891 }
2892 zfs_close(zhp);
2893 } else {
2894 /*
2895 * Destination filesystem does not exist. Therefore we better
2896 * be creating a new filesystem (either from a full backup, or
2897 * a clone). It would therefore be invalid if the user
2898 * specified only the pool name (i.e. if the destination name
2899 * contained no slash character).
2900 */
2901 if (!stream_wantsnewfs ||
2902 (cp = strrchr(zc.zc_name, '/')) == NULL) {
2903 zcmd_free_nvlists(&zc);
2904 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
2905 "destination '%s' does not exist"), zc.zc_name);
2906 return (zfs_error(hdl, EZFS_NOENT, errbuf));
2907 }
2908
2909 /*
2910 * Trim off the final dataset component so we perform the
2911 * recvbackup ioctl to the filesystems's parent.
2912 */
2913 *cp = '\0';
2914
2915 if (flags->isprefix && !flags->istail && !flags->dryrun &&
2916 create_parents(hdl, zc.zc_value, strlen(tosnap)) != 0) {
2917 zcmd_free_nvlists(&zc);
2918 return (zfs_error(hdl, EZFS_BADRESTORE, errbuf));
2919 }
2920
2921 newfs = B_TRUE;
2922 }
2923
2924 zc.zc_begin_record = drr_noswap->drr_u.drr_begin;
2925 zc.zc_cookie = infd;
2926 zc.zc_guid = flags->force;
2927 if (flags->verbose) {
2928 (void) printf("%s %s stream of %s into %s\n",
2929 flags->dryrun ? "would receive" : "receiving",
2930 drrb->drr_fromguid ? "incremental" : "full",
2931 drrb->drr_toname, zc.zc_value);
2932 (void) fflush(stdout);
2933 }
2934
2935 if (flags->dryrun) {
2936 zcmd_free_nvlists(&zc);
2937 return (recv_skip(hdl, infd, flags->byteswap));
2938 }
2939
2940 zc.zc_nvlist_dst = (uint64_t)(uintptr_t)prop_errbuf;
2941 zc.zc_nvlist_dst_size = sizeof (prop_errbuf);
2942 zc.zc_cleanup_fd = cleanup_fd;
2943 zc.zc_action_handle = *action_handlep;
2944
2945 err = ioctl_err = zfs_ioctl(hdl, ZFS_IOC_RECV, &zc);
2946 ioctl_errno = errno;
2947 prop_errflags = (zprop_errflags_t)zc.zc_obj;
2948
2949 if (err == 0) {
2950 nvlist_t *prop_errors;
2951 VERIFY(0 == nvlist_unpack((void *)(uintptr_t)zc.zc_nvlist_dst,
2952 zc.zc_nvlist_dst_size, &prop_errors, 0));
2953
2954 nvpair_t *prop_err = NULL;
2955
2956 while ((prop_err = nvlist_next_nvpair(prop_errors,
2957 prop_err)) != NULL) {
2958 char tbuf[1024];
2959 zfs_prop_t prop;
2960 int intval;
2961
2962 prop = zfs_name_to_prop(nvpair_name(prop_err));
2963 (void) nvpair_value_int32(prop_err, &intval);
2964 if (strcmp(nvpair_name(prop_err),
2965 ZPROP_N_MORE_ERRORS) == 0) {
2966 trunc_prop_errs(intval);
2967 break;
2968 } else if (snapname == NULL || finalsnap == NULL ||
2969 strcmp(finalsnap, snapname) == 0 ||
2970 strcmp(nvpair_name(prop_err),
2971 zfs_prop_to_name(ZFS_PROP_REFQUOTA)) != 0) {
2972 /*
2973 * Skip the special case of, for example,
2974 * "refquota", errors on intermediate
2975 * snapshots leading up to a final one.
2976 * That's why we have all of the checks above.
2977 *
2978 * See zfs_ioctl.c's extract_delay_props() for
2979 * a list of props which can fail on
2980 * intermediate snapshots, but shouldn't
2981 * affect the overall receive.
2982 */
2983 (void) snprintf(tbuf, sizeof (tbuf),
2984 dgettext(TEXT_DOMAIN,
2985 "cannot receive %s property on %s"),
2986 nvpair_name(prop_err), zc.zc_name);
2987 zfs_setprop_error(hdl, prop, intval, tbuf);
2988 }
2989 }
2990 nvlist_free(prop_errors);
2991 }
2992
2993 zc.zc_nvlist_dst = 0;
2994 zc.zc_nvlist_dst_size = 0;
2995 zcmd_free_nvlists(&zc);
2996
2997 if (err == 0 && snapprops_nvlist) {
2998 zfs_cmd_t zc2 = { 0 };
2999
3000 (void) strcpy(zc2.zc_name, zc.zc_value);
3001 zc2.zc_cookie = B_TRUE; /* received */
3002 if (zcmd_write_src_nvlist(hdl, &zc2, snapprops_nvlist) == 0) {
3003 (void) zfs_ioctl(hdl, ZFS_IOC_SET_PROP, &zc2);
3004 zcmd_free_nvlists(&zc2);
3005 }
3006 }
3007
3008 if (err && (ioctl_errno == ENOENT || ioctl_errno == EEXIST)) {
3009 /*
3010 * It may be that this snapshot already exists,
3011 * in which case we want to consume & ignore it
3012 * rather than failing.
3013 */
3014 avl_tree_t *local_avl;
3015 nvlist_t *local_nv, *fs;
3016 cp = strchr(zc.zc_value, '@');
3017
3018 /*
3019 * XXX Do this faster by just iterating over snaps in
3020 * this fs. Also if zc_value does not exist, we will
3021 * get a strange "does not exist" error message.
3022 */
3023 *cp = '\0';
3024 if (gather_nvlist(hdl, zc.zc_value, NULL, NULL, B_FALSE,
3025 &local_nv, &local_avl) == 0) {
3026 *cp = '@';
3027 fs = fsavl_find(local_avl, drrb->drr_toguid, NULL);
3028 fsavl_destroy(local_avl);
3029 nvlist_free(local_nv);
3030
3031 if (fs != NULL) {
3032 if (flags->verbose) {
3033 (void) printf("snap %s already exists; "
3034 "ignoring\n", zc.zc_value);
3035 }
3036 err = ioctl_err = recv_skip(hdl, infd,
3037 flags->byteswap);
3038 }
3039 }
3040 *cp = '@';
3041 }
3042
3043 if (ioctl_err != 0) {
3044 switch (ioctl_errno) {
3045 case ENODEV:
3046 cp = strchr(zc.zc_value, '@');
3047 *cp = '\0';
3048 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3049 "most recent snapshot of %s does not\n"
3050 "match incremental source"), zc.zc_value);
3051 (void) zfs_error(hdl, EZFS_BADRESTORE, errbuf);
3052 *cp = '@';
3053 break;
3054 case ETXTBSY:
3055 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3056 "destination %s has been modified\n"
3057 "since most recent snapshot"), zc.zc_name);
3058 (void) zfs_error(hdl, EZFS_BADRESTORE, errbuf);
3059 break;
3060 case EEXIST:
3061 cp = strchr(zc.zc_value, '@');
3062 if (newfs) {
3063 /* it's the containing fs that exists */
3064 *cp = '\0';
3065 }
3066 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3067 "destination already exists"));
3068 (void) zfs_error_fmt(hdl, EZFS_EXISTS,
3069 dgettext(TEXT_DOMAIN, "cannot restore to %s"),
3070 zc.zc_value);
3071 *cp = '@';
3072 break;
3073 case EINVAL:
3074 (void) zfs_error(hdl, EZFS_BADSTREAM, errbuf);
3075 break;
3076 case ECKSUM:
3077 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3078 "invalid stream (checksum mismatch)"));
3079 (void) zfs_error(hdl, EZFS_BADSTREAM, errbuf);
3080 break;
3081 case ENOTSUP:
3082 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3083 "pool must be upgraded to receive this stream."));
3084 (void) zfs_error(hdl, EZFS_BADVERSION, errbuf);
3085 break;
3086 case EDQUOT:
3087 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3088 "destination %s space quota exceeded"), zc.zc_name);
3089 (void) zfs_error(hdl, EZFS_NOSPC, errbuf);
3090 break;
3091 default:
3092 (void) zfs_standard_error(hdl, ioctl_errno, errbuf);
3093 }
3094 }
3095
3096 /*
3097 * Mount the target filesystem (if created). Also mount any
3098 * children of the target filesystem if we did a replication
3099 * receive (indicated by stream_avl being non-NULL).
3100 */
3101 cp = strchr(zc.zc_value, '@');
3102 if (cp && (ioctl_err == 0 || !newfs)) {
3103 zfs_handle_t *h;
3104
3105 *cp = '\0';
3106 h = zfs_open(hdl, zc.zc_value,
3107 ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME);
3108 if (h != NULL) {
3109 if (h->zfs_type == ZFS_TYPE_VOLUME) {
3110 *cp = '@';
3111 } else if (newfs || stream_avl) {
3112 /*
3113 * Track the first/top of hierarchy fs,
3114 * for mounting and sharing later.
3115 */
3116 if (top_zfs && *top_zfs == NULL)
3117 *top_zfs = zfs_strdup(hdl, zc.zc_value);
3118 }
3119 zfs_close(h);
3120 }
3121 *cp = '@';
3122 }
3123
3124 if (clp) {
3125 err |= changelist_postfix(clp);
3126 changelist_free(clp);
3127 }
3128
3129 if (prop_errflags & ZPROP_ERR_NOCLEAR) {
3130 (void) fprintf(stderr, dgettext(TEXT_DOMAIN, "Warning: "
3131 "failed to clear unreceived properties on %s"),
3132 zc.zc_name);
3133 (void) fprintf(stderr, "\n");
3134 }
3135 if (prop_errflags & ZPROP_ERR_NORESTORE) {
3136 (void) fprintf(stderr, dgettext(TEXT_DOMAIN, "Warning: "
3137 "failed to restore original properties on %s"),
3138 zc.zc_name);
3139 (void) fprintf(stderr, "\n");
3140 }
3141
3142 if (err || ioctl_err)
3143 return (-1);
3144
3145 *action_handlep = zc.zc_action_handle;
3146
3147 if (flags->verbose) {
3148 char buf1[64];
3149 char buf2[64];
3150 uint64_t bytes = zc.zc_cookie;
3151 time_t delta = time(NULL) - begin_time;
3152 if (delta == 0)
3153 delta = 1;
3154 zfs_nicenum(bytes, buf1, sizeof (buf1));
3155 zfs_nicenum(bytes/delta, buf2, sizeof (buf1));
3156
3157 (void) printf("received %sB stream in %lu seconds (%sB/sec)\n",
3158 buf1, delta, buf2);
3159 }
3160
3161 return (0);
3162 }
3163
3164 static int
3165 zfs_receive_impl(libzfs_handle_t *hdl, const char *tosnap, recvflags_t *flags,
3166 int infd, const char *sendfs, nvlist_t *stream_nv, avl_tree_t *stream_avl,
3167 char **top_zfs, int cleanup_fd, uint64_t *action_handlep,
3168 const char *finalsnap)
3169 {
3170 int err;
3171 dmu_replay_record_t drr, drr_noswap;
3172 struct drr_begin *drrb = &drr.drr_u.drr_begin;
3173 char errbuf[1024];
3174 zio_cksum_t zcksum = { 0 };
3175 uint64_t featureflags;
3176 int hdrtype;
3177
3178 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
3179 "cannot receive"));
3180
3181 if (flags->isprefix &&
3182 !zfs_dataset_exists(hdl, tosnap, ZFS_TYPE_DATASET)) {
3183 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "specified fs "
3184 "(%s) does not exist"), tosnap);
3185 return (zfs_error(hdl, EZFS_NOENT, errbuf));
3186 }
3187
3188 /* read in the BEGIN record */
3189 if (0 != (err = recv_read(hdl, infd, &drr, sizeof (drr), B_FALSE,
3190 &zcksum)))
3191 return (err);
3192
3193 if (drr.drr_type == DRR_END || drr.drr_type == BSWAP_32(DRR_END)) {
3194 /* It's the double end record at the end of a package */
3195 return (ENODATA);
3196 }
3197
3198 /* the kernel needs the non-byteswapped begin record */
3199 drr_noswap = drr;
3200
3201 flags->byteswap = B_FALSE;
3202 if (drrb->drr_magic == BSWAP_64(DMU_BACKUP_MAGIC)) {
3203 /*
3204 * We computed the checksum in the wrong byteorder in
3205 * recv_read() above; do it again correctly.
3206 */
3207 bzero(&zcksum, sizeof (zio_cksum_t));
3208 fletcher_4_incremental_byteswap(&drr, sizeof (drr), &zcksum);
3209 flags->byteswap = B_TRUE;
3210
3211 drr.drr_type = BSWAP_32(drr.drr_type);
3212 drr.drr_payloadlen = BSWAP_32(drr.drr_payloadlen);
3213 drrb->drr_magic = BSWAP_64(drrb->drr_magic);
3214 drrb->drr_versioninfo = BSWAP_64(drrb->drr_versioninfo);
3215 drrb->drr_creation_time = BSWAP_64(drrb->drr_creation_time);
3216 drrb->drr_type = BSWAP_32(drrb->drr_type);
3217 drrb->drr_flags = BSWAP_32(drrb->drr_flags);
3218 drrb->drr_toguid = BSWAP_64(drrb->drr_toguid);
3219 drrb->drr_fromguid = BSWAP_64(drrb->drr_fromguid);
3220 }
3221
3222 if (drrb->drr_magic != DMU_BACKUP_MAGIC || drr.drr_type != DRR_BEGIN) {
3223 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "invalid "
3224 "stream (bad magic number)"));
3225 return (zfs_error(hdl, EZFS_BADSTREAM, errbuf));
3226 }
3227
3228 featureflags = DMU_GET_FEATUREFLAGS(drrb->drr_versioninfo);
3229 hdrtype = DMU_GET_STREAM_HDRTYPE(drrb->drr_versioninfo);
3230
3231 if (!DMU_STREAM_SUPPORTED(featureflags) ||
3232 (hdrtype != DMU_SUBSTREAM && hdrtype != DMU_COMPOUNDSTREAM)) {
3233 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3234 "stream has unsupported feature, feature flags = %lx"),
3235 featureflags);
3236 return (zfs_error(hdl, EZFS_BADSTREAM, errbuf));
3237 }
3238
3239 if (strchr(drrb->drr_toname, '@') == NULL) {
3240 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "invalid "
3241 "stream (bad snapshot name)"));
3242 return (zfs_error(hdl, EZFS_BADSTREAM, errbuf));
3243 }
3244
3245 if (DMU_GET_STREAM_HDRTYPE(drrb->drr_versioninfo) == DMU_SUBSTREAM) {
3246 char nonpackage_sendfs[ZFS_MAXNAMELEN];
3247 if (sendfs == NULL) {
3248 /*
3249 * We were not called from zfs_receive_package(). Get
3250 * the fs specified by 'zfs send'.
3251 */
3252 char *cp;
3253 (void) strlcpy(nonpackage_sendfs,
3254 drr.drr_u.drr_begin.drr_toname, ZFS_MAXNAMELEN);
3255 if ((cp = strchr(nonpackage_sendfs, '@')) != NULL)
3256 *cp = '\0';
3257 sendfs = nonpackage_sendfs;
3258 VERIFY(finalsnap == NULL);
3259 }
3260 return (zfs_receive_one(hdl, infd, tosnap, flags,
3261 &drr, &drr_noswap, sendfs, stream_nv, stream_avl,
3262 top_zfs, cleanup_fd, action_handlep, finalsnap));
3263 } else {
3264 assert(DMU_GET_STREAM_HDRTYPE(drrb->drr_versioninfo) ==
3265 DMU_COMPOUNDSTREAM);
3266 return (zfs_receive_package(hdl, infd, tosnap, flags,
3267 &drr, &zcksum, top_zfs, cleanup_fd, action_handlep));
3268 }
3269 }
3270
3271 /*
3272 * Restores a backup of tosnap from the file descriptor specified by infd.
3273 * Return 0 on total success, -2 if some things couldn't be
3274 * destroyed/renamed/promoted, -1 if some things couldn't be received.
3275 * (-1 will override -2).
3276 */
3277 int
3278 zfs_receive(libzfs_handle_t *hdl, const char *tosnap, recvflags_t *flags,
3279 int infd, avl_tree_t *stream_avl)
3280 {
3281 char *top_zfs = NULL;
3282 int err;
3283 int cleanup_fd;
3284 uint64_t action_handle = 0;
3285
3286 cleanup_fd = open(ZFS_DEV, O_RDWR|O_EXCL);
3287 VERIFY(cleanup_fd >= 0);
3288
3289 err = zfs_receive_impl(hdl, tosnap, flags, infd, NULL, NULL,
3290 stream_avl, &top_zfs, cleanup_fd, &action_handle, NULL);
3291
3292 VERIFY(0 == close(cleanup_fd));
3293
3294 if (err == 0 && !flags->nomount && top_zfs) {
3295 zfs_handle_t *zhp;
3296 prop_changelist_t *clp;
3297
3298 zhp = zfs_open(hdl, top_zfs, ZFS_TYPE_FILESYSTEM);
3299 if (zhp != NULL) {
3300 clp = changelist_gather(zhp, ZFS_PROP_MOUNTPOINT,
3301 CL_GATHER_MOUNT_ALWAYS, 0);
3302 zfs_close(zhp);
3303 if (clp != NULL) {
3304 /* mount and share received datasets */
3305 err = changelist_postfix(clp);
3306 changelist_free(clp);
3307 }
3308 }
3309 if (zhp == NULL || clp == NULL || err)
3310 err = -1;
3311 }
3312 if (top_zfs)
3313 free(top_zfs);
3314
3315 return (err);
3316 }