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