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1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22 /*
23 * Copyright 2009 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 #include <assert.h>
28 #include <ctype.h>
29 #include <errno.h>
30 #include <libdevinfo.h>
31 #include <libintl.h>
32 #include <stdio.h>
33 #include <stdlib.h>
34 #include <strings.h>
35 #include <unistd.h>
36 #include <stddef.h>
37 #include <fcntl.h>
38 #include <sys/mount.h>
39 #include <sys/mntent.h>
40 #include <sys/mnttab.h>
41 #include <sys/avl.h>
42 #include <stddef.h>
43
44 #include <libzfs.h>
45
46 #include "zfs_namecheck.h"
47 #include "zfs_prop.h"
48 #include "libzfs_impl.h"
49
50 #include <fletcher.c> /* XXX */
51
52 static int zfs_receive_impl(libzfs_handle_t *, const char *, recvflags_t,
53 int, avl_tree_t *, char **);
54
55 /*
56 * Routines for dealing with the AVL tree of fs-nvlists
57 */
58 typedef struct fsavl_node {
59 avl_node_t fn_node;
60 nvlist_t *fn_nvfs;
61 char *fn_snapname;
62 uint64_t fn_guid;
63 } fsavl_node_t;
64
65 static int
66 fsavl_compare(const void *arg1, const void *arg2)
67 {
68 const fsavl_node_t *fn1 = arg1;
69 const fsavl_node_t *fn2 = arg2;
70
71 if (fn1->fn_guid > fn2->fn_guid)
72 return (+1);
73 else if (fn1->fn_guid < fn2->fn_guid)
74 return (-1);
75 else
76 return (0);
77 }
78
79 /*
80 * Given the GUID of a snapshot, find its containing filesystem and
81 * (optionally) name.
82 */
83 static nvlist_t *
84 fsavl_find(avl_tree_t *avl, uint64_t snapguid, char **snapname)
85 {
86 fsavl_node_t fn_find;
87 fsavl_node_t *fn;
88
89 fn_find.fn_guid = snapguid;
90
91 fn = avl_find(avl, &fn_find, NULL);
92 if (fn) {
93 if (snapname)
94 *snapname = fn->fn_snapname;
95 return (fn->fn_nvfs);
96 }
97 return (NULL);
98 }
99
100 static void
101 fsavl_destroy(avl_tree_t *avl)
102 {
103 fsavl_node_t *fn;
104 void *cookie;
105
106 if (avl == NULL)
107 return;
108
109 cookie = NULL;
110 while ((fn = avl_destroy_nodes(avl, &cookie)) != NULL)
111 free(fn);
112 avl_destroy(avl);
113 free(avl);
114 }
115
116 static avl_tree_t *
117 fsavl_create(nvlist_t *fss)
118 {
119 avl_tree_t *fsavl;
120 nvpair_t *fselem = NULL;
121
122 if ((fsavl = malloc(sizeof (avl_tree_t))) == NULL)
123 return (NULL);
124
125 avl_create(fsavl, fsavl_compare, sizeof (fsavl_node_t),
126 offsetof(fsavl_node_t, fn_node));
127
128 while ((fselem = nvlist_next_nvpair(fss, fselem)) != NULL) {
129 nvlist_t *nvfs, *snaps;
130 nvpair_t *snapelem = NULL;
131
132 VERIFY(0 == nvpair_value_nvlist(fselem, &nvfs));
133 VERIFY(0 == nvlist_lookup_nvlist(nvfs, "snaps", &snaps));
134
135 while ((snapelem =
136 nvlist_next_nvpair(snaps, snapelem)) != NULL) {
137 fsavl_node_t *fn;
138 uint64_t guid;
139
140 VERIFY(0 == nvpair_value_uint64(snapelem, &guid));
141 if ((fn = malloc(sizeof (fsavl_node_t))) == NULL) {
142 fsavl_destroy(fsavl);
143 return (NULL);
144 }
145 fn->fn_nvfs = nvfs;
146 fn->fn_snapname = nvpair_name(snapelem);
147 fn->fn_guid = guid;
148
149 /*
150 * Note: if there are multiple snaps with the
151 * same GUID, we ignore all but one.
152 */
153 if (avl_find(fsavl, fn, NULL) == NULL)
154 avl_add(fsavl, fn);
155 else
156 free(fn);
157 }
158 }
159
160 return (fsavl);
161 }
162
163 /*
164 * Routines for dealing with the giant nvlist of fs-nvlists, etc.
165 */
166 typedef struct send_data {
167 uint64_t parent_fromsnap_guid;
168 nvlist_t *parent_snaps;
169 nvlist_t *fss;
170 nvlist_t *snapprops;
171 const char *fromsnap;
172 const char *tosnap;
173
174 /*
175 * The header nvlist is of the following format:
176 * {
177 * "tosnap" -> string
178 * "fromsnap" -> string (if incremental)
179 * "fss" -> {
180 * id -> {
181 *
182 * "name" -> string (full name; for debugging)
183 * "parentfromsnap" -> number (guid of fromsnap in parent)
184 *
185 * "props" -> { name -> value (only if set here) }
186 * "snaps" -> { name (lastname) -> number (guid) }
187 * "snapprops" -> { name (lastname) -> { name -> value } }
188 *
189 * "origin" -> number (guid) (if clone)
190 * "sent" -> boolean (not on-disk)
191 * }
192 * }
193 * }
194 *
195 */
196 } send_data_t;
197
198 static void send_iterate_prop(zfs_handle_t *zhp, nvlist_t *nv);
199
200 static int
201 send_iterate_snap(zfs_handle_t *zhp, void *arg)
202 {
203 send_data_t *sd = arg;
204 uint64_t guid = zhp->zfs_dmustats.dds_guid;
205 char *snapname;
206 nvlist_t *nv;
207
208 snapname = strrchr(zhp->zfs_name, '@')+1;
209
210 VERIFY(0 == nvlist_add_uint64(sd->parent_snaps, snapname, guid));
211 /*
212 * NB: if there is no fromsnap here (it's a newly created fs in
213 * an incremental replication), we will substitute the tosnap.
214 */
215 if ((sd->fromsnap && strcmp(snapname, sd->fromsnap) == 0) ||
216 (sd->parent_fromsnap_guid == 0 && sd->tosnap &&
217 strcmp(snapname, sd->tosnap) == 0)) {
218 sd->parent_fromsnap_guid = guid;
219 }
220
221 VERIFY(0 == nvlist_alloc(&nv, NV_UNIQUE_NAME, 0));
222 send_iterate_prop(zhp, nv);
223 VERIFY(0 == nvlist_add_nvlist(sd->snapprops, snapname, nv));
224 nvlist_free(nv);
225
226 zfs_close(zhp);
227 return (0);
228 }
229
230 static void
231 send_iterate_prop(zfs_handle_t *zhp, nvlist_t *nv)
232 {
233 nvpair_t *elem = NULL;
234
235 while ((elem = nvlist_next_nvpair(zhp->zfs_props, elem)) != NULL) {
236 char *propname = nvpair_name(elem);
237 zfs_prop_t prop = zfs_name_to_prop(propname);
238 nvlist_t *propnv;
239
240 if (!zfs_prop_user(propname) && zfs_prop_readonly(prop))
241 continue;
242
243 verify(nvpair_value_nvlist(elem, &propnv) == 0);
244 if (prop == ZFS_PROP_QUOTA || prop == ZFS_PROP_RESERVATION) {
245 /* these guys are modifyable, but have no source */
246 uint64_t value;
247 verify(nvlist_lookup_uint64(propnv,
248 ZPROP_VALUE, &value) == 0);
249 if (zhp->zfs_type == ZFS_TYPE_SNAPSHOT)
250 continue;
251 } else {
252 char *source;
253 if (nvlist_lookup_string(propnv,
254 ZPROP_SOURCE, &source) != 0)
255 continue;
256 if (strcmp(source, zhp->zfs_name) != 0)
257 continue;
258 }
259
260 if (zfs_prop_user(propname) ||
261 zfs_prop_get_type(prop) == PROP_TYPE_STRING) {
262 char *value;
263 verify(nvlist_lookup_string(propnv,
264 ZPROP_VALUE, &value) == 0);
265 VERIFY(0 == nvlist_add_string(nv, propname, value));
266 } else {
267 uint64_t value;
268 verify(nvlist_lookup_uint64(propnv,
269 ZPROP_VALUE, &value) == 0);
270 VERIFY(0 == nvlist_add_uint64(nv, propname, value));
271 }
272 }
273 }
274
275 static int
276 send_iterate_fs(zfs_handle_t *zhp, void *arg)
277 {
278 send_data_t *sd = arg;
279 nvlist_t *nvfs, *nv;
280 int rv;
281 uint64_t parent_fromsnap_guid_save = sd->parent_fromsnap_guid;
282 uint64_t guid = zhp->zfs_dmustats.dds_guid;
283 char guidstring[64];
284
285 VERIFY(0 == nvlist_alloc(&nvfs, NV_UNIQUE_NAME, 0));
286 VERIFY(0 == nvlist_add_string(nvfs, "name", zhp->zfs_name));
287 VERIFY(0 == nvlist_add_uint64(nvfs, "parentfromsnap",
288 sd->parent_fromsnap_guid));
289
290 if (zhp->zfs_dmustats.dds_origin[0]) {
291 zfs_handle_t *origin = zfs_open(zhp->zfs_hdl,
292 zhp->zfs_dmustats.dds_origin, ZFS_TYPE_SNAPSHOT);
293 if (origin == NULL)
294 return (-1);
295 VERIFY(0 == nvlist_add_uint64(nvfs, "origin",
296 origin->zfs_dmustats.dds_guid));
297 }
298
299 /* iterate over props */
300 VERIFY(0 == nvlist_alloc(&nv, NV_UNIQUE_NAME, 0));
301 send_iterate_prop(zhp, nv);
302 VERIFY(0 == nvlist_add_nvlist(nvfs, "props", nv));
303 nvlist_free(nv);
304
305 /* iterate over snaps, and set sd->parent_fromsnap_guid */
306 sd->parent_fromsnap_guid = 0;
307 VERIFY(0 == nvlist_alloc(&sd->parent_snaps, NV_UNIQUE_NAME, 0));
308 VERIFY(0 == nvlist_alloc(&sd->snapprops, NV_UNIQUE_NAME, 0));
309 (void) zfs_iter_snapshots(zhp, send_iterate_snap, sd);
310 VERIFY(0 == nvlist_add_nvlist(nvfs, "snaps", sd->parent_snaps));
311 VERIFY(0 == nvlist_add_nvlist(nvfs, "snapprops", sd->snapprops));
312 nvlist_free(sd->parent_snaps);
313 nvlist_free(sd->snapprops);
314
315 /* add this fs to nvlist */
316 (void) snprintf(guidstring, sizeof (guidstring),
317 "0x%llx", (longlong_t)guid);
318 VERIFY(0 == nvlist_add_nvlist(sd->fss, guidstring, nvfs));
319 nvlist_free(nvfs);
320
321 /* iterate over children */
322 rv = zfs_iter_filesystems(zhp, send_iterate_fs, sd);
323
324 sd->parent_fromsnap_guid = parent_fromsnap_guid_save;
325
326 zfs_close(zhp);
327 return (rv);
328 }
329
330 static int
331 gather_nvlist(libzfs_handle_t *hdl, const char *fsname, const char *fromsnap,
332 const char *tosnap, nvlist_t **nvlp, avl_tree_t **avlp)
333 {
334 zfs_handle_t *zhp;
335 send_data_t sd = { 0 };
336 int error;
337
338 zhp = zfs_open(hdl, fsname, ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME);
339 if (zhp == NULL)
340 return (EZFS_BADTYPE);
341
342 VERIFY(0 == nvlist_alloc(&sd.fss, NV_UNIQUE_NAME, 0));
343 sd.fromsnap = fromsnap;
344 sd.tosnap = tosnap;
345
346 if ((error = send_iterate_fs(zhp, &sd)) != 0) {
347 nvlist_free(sd.fss);
348 if (avlp != NULL)
349 *avlp = NULL;
350 *nvlp = NULL;
351 return (error);
352 }
353
354 if (avlp != NULL && (*avlp = fsavl_create(sd.fss)) == NULL) {
355 nvlist_free(sd.fss);
356 *nvlp = NULL;
357 return (EZFS_NOMEM);
358 }
359
360 *nvlp = sd.fss;
361 return (0);
362 }
363
364 /*
365 * Routines for dealing with the sorted snapshot functionality
366 */
367 typedef struct zfs_node {
368 zfs_handle_t *zn_handle;
369 avl_node_t zn_avlnode;
370 } zfs_node_t;
371
372 static int
373 zfs_sort_snaps(zfs_handle_t *zhp, void *data)
374 {
375 avl_tree_t *avl = data;
376 zfs_node_t *node = zfs_alloc(zhp->zfs_hdl, sizeof (zfs_node_t));
377
378 node->zn_handle = zhp;
379 avl_add(avl, node);
380 return (0);
381 }
382
383 /* ARGSUSED */
384 static int
385 zfs_snapshot_compare(const void *larg, const void *rarg)
386 {
387 zfs_handle_t *l = ((zfs_node_t *)larg)->zn_handle;
388 zfs_handle_t *r = ((zfs_node_t *)rarg)->zn_handle;
389 uint64_t lcreate, rcreate;
390
391 /*
392 * Sort them according to creation time. We use the hidden
393 * CREATETXG property to get an absolute ordering of snapshots.
394 */
395 lcreate = zfs_prop_get_int(l, ZFS_PROP_CREATETXG);
396 rcreate = zfs_prop_get_int(r, ZFS_PROP_CREATETXG);
397
398 if (lcreate < rcreate)
399 return (-1);
400 else if (lcreate > rcreate)
401 return (+1);
402 else
403 return (0);
404 }
405
406 static int
407 zfs_iter_snapshots_sorted(zfs_handle_t *zhp, zfs_iter_f callback, void *data)
408 {
409 int ret = 0;
410 zfs_node_t *node;
411 avl_tree_t avl;
412 void *cookie = NULL;
413
414 avl_create(&avl, zfs_snapshot_compare,
415 sizeof (zfs_node_t), offsetof(zfs_node_t, zn_avlnode));
416
417 ret = zfs_iter_snapshots(zhp, zfs_sort_snaps, &avl);
418
419 for (node = avl_first(&avl); node != NULL; node = AVL_NEXT(&avl, node))
420 ret |= callback(node->zn_handle, data);
421
422 while ((node = avl_destroy_nodes(&avl, &cookie)) != NULL)
423 free(node);
424
425 avl_destroy(&avl);
426
427 return (ret);
428 }
429
430 /*
431 * Routines specific to "zfs send"
432 */
433 typedef struct send_dump_data {
434 /* these are all just the short snapname (the part after the @) */
435 const char *fromsnap;
436 const char *tosnap;
437 char lastsnap[ZFS_MAXNAMELEN];
438 boolean_t seenfrom, seento, replicate, doall, fromorigin;
439 boolean_t verbose;
440 int outfd;
441 boolean_t err;
442 nvlist_t *fss;
443 avl_tree_t *fsavl;
444 } send_dump_data_t;
445
446 /*
447 * Dumps a backup of the given snapshot (incremental from fromsnap if it's not
448 * NULL) to the file descriptor specified by outfd.
449 */
450 static int
451 dump_ioctl(zfs_handle_t *zhp, const char *fromsnap, boolean_t fromorigin,
452 int outfd)
453 {
454 zfs_cmd_t zc = { 0 };
455 libzfs_handle_t *hdl = zhp->zfs_hdl;
456
457 assert(zhp->zfs_type == ZFS_TYPE_SNAPSHOT);
458 assert(fromsnap == NULL || fromsnap[0] == '\0' || !fromorigin);
459
460 (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
461 if (fromsnap)
462 (void) strlcpy(zc.zc_value, fromsnap, sizeof (zc.zc_value));
463 zc.zc_cookie = outfd;
464 zc.zc_obj = fromorigin;
465
466 if (ioctl(zhp->zfs_hdl->libzfs_fd, ZFS_IOC_SEND, &zc) != 0) {
467 char errbuf[1024];
468 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
469 "warning: cannot send '%s'"), zhp->zfs_name);
470
471 switch (errno) {
472
473 case EXDEV:
474 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
475 "not an earlier snapshot from the same fs"));
476 return (zfs_error(hdl, EZFS_CROSSTARGET, errbuf));
477
478 case ENOENT:
479 if (zfs_dataset_exists(hdl, zc.zc_name,
480 ZFS_TYPE_SNAPSHOT)) {
481 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
482 "incremental source (@%s) does not exist"),
483 zc.zc_value);
484 }
485 return (zfs_error(hdl, EZFS_NOENT, errbuf));
486
487 case EDQUOT:
488 case EFBIG:
489 case EIO:
490 case ENOLINK:
491 case ENOSPC:
492 case ENOSTR:
493 case ENXIO:
494 case EPIPE:
495 case ERANGE:
496 case EFAULT:
497 case EROFS:
498 zfs_error_aux(hdl, strerror(errno));
499 return (zfs_error(hdl, EZFS_BADBACKUP, errbuf));
500
501 default:
502 return (zfs_standard_error(hdl, errno, errbuf));
503 }
504 }
505
506 return (0);
507 }
508
509 static int
510 dump_snapshot(zfs_handle_t *zhp, void *arg)
511 {
512 send_dump_data_t *sdd = arg;
513 const char *thissnap;
514 int err;
515
516 thissnap = strchr(zhp->zfs_name, '@') + 1;
517
518 if (sdd->fromsnap && !sdd->seenfrom &&
519 strcmp(sdd->fromsnap, thissnap) == 0) {
520 sdd->seenfrom = B_TRUE;
521 (void) strcpy(sdd->lastsnap, thissnap);
522 zfs_close(zhp);
523 return (0);
524 }
525
526 if (sdd->seento || !sdd->seenfrom) {
527 zfs_close(zhp);
528 return (0);
529 }
530
531 /* send it */
532 if (sdd->verbose) {
533 (void) fprintf(stderr, "sending from @%s to %s\n",
534 sdd->lastsnap, zhp->zfs_name);
535 }
536
537 err = dump_ioctl(zhp, sdd->lastsnap,
538 sdd->lastsnap[0] == '\0' && (sdd->fromorigin || sdd->replicate),
539 sdd->outfd);
540
541 if (!sdd->seento && strcmp(sdd->tosnap, thissnap) == 0)
542 sdd->seento = B_TRUE;
543
544 (void) strcpy(sdd->lastsnap, thissnap);
545 zfs_close(zhp);
546 return (err);
547 }
548
549 static int
550 dump_filesystem(zfs_handle_t *zhp, void *arg)
551 {
552 int rv = 0;
553 send_dump_data_t *sdd = arg;
554 boolean_t missingfrom = B_FALSE;
555 zfs_cmd_t zc = { 0 };
556
557 (void) snprintf(zc.zc_name, sizeof (zc.zc_name), "%s@%s",
558 zhp->zfs_name, sdd->tosnap);
559 if (ioctl(zhp->zfs_hdl->libzfs_fd, ZFS_IOC_OBJSET_STATS, &zc) != 0) {
560 (void) fprintf(stderr, "WARNING: "
561 "could not send %s@%s: does not exist\n",
562 zhp->zfs_name, sdd->tosnap);
563 sdd->err = B_TRUE;
564 return (0);
565 }
566
567 if (sdd->replicate && sdd->fromsnap) {
568 /*
569 * If this fs does not have fromsnap, and we're doing
570 * recursive, we need to send a full stream from the
571 * beginning (or an incremental from the origin if this
572 * is a clone). If we're doing non-recursive, then let
573 * them get the error.
574 */
575 (void) snprintf(zc.zc_name, sizeof (zc.zc_name), "%s@%s",
576 zhp->zfs_name, sdd->fromsnap);
577 if (ioctl(zhp->zfs_hdl->libzfs_fd,
578 ZFS_IOC_OBJSET_STATS, &zc) != 0) {
579 missingfrom = B_TRUE;
580 }
581 }
582
583 if (sdd->doall) {
584 sdd->seenfrom = sdd->seento = sdd->lastsnap[0] = 0;
585 if (sdd->fromsnap == NULL || missingfrom)
586 sdd->seenfrom = B_TRUE;
587
588 rv = zfs_iter_snapshots_sorted(zhp, dump_snapshot, arg);
589 if (!sdd->seenfrom) {
590 (void) fprintf(stderr,
591 "WARNING: could not send %s@%s:\n"
592 "incremental source (%s@%s) does not exist\n",
593 zhp->zfs_name, sdd->tosnap,
594 zhp->zfs_name, sdd->fromsnap);
595 sdd->err = B_TRUE;
596 } else if (!sdd->seento) {
597 (void) fprintf(stderr,
598 "WARNING: could not send %s@%s:\n"
599 "incremental source (%s@%s) "
600 "is not earlier than it\n",
601 zhp->zfs_name, sdd->tosnap,
602 zhp->zfs_name, sdd->fromsnap);
603 sdd->err = B_TRUE;
604 }
605 } else {
606 zfs_handle_t *snapzhp;
607 char snapname[ZFS_MAXNAMELEN];
608
609 (void) snprintf(snapname, sizeof (snapname), "%s@%s",
610 zfs_get_name(zhp), sdd->tosnap);
611 snapzhp = zfs_open(zhp->zfs_hdl, snapname, ZFS_TYPE_SNAPSHOT);
612 if (snapzhp == NULL) {
613 rv = -1;
614 } else {
615 rv = dump_ioctl(snapzhp,
616 missingfrom ? NULL : sdd->fromsnap,
617 sdd->fromorigin || missingfrom,
618 sdd->outfd);
619 sdd->seento = B_TRUE;
620 zfs_close(snapzhp);
621 }
622 }
623
624 return (rv);
625 }
626
627 static int
628 dump_filesystems(zfs_handle_t *rzhp, void *arg)
629 {
630 send_dump_data_t *sdd = arg;
631 nvpair_t *fspair;
632 boolean_t needagain, progress;
633
634 if (!sdd->replicate)
635 return (dump_filesystem(rzhp, sdd));
636
637 again:
638 needagain = progress = B_FALSE;
639 for (fspair = nvlist_next_nvpair(sdd->fss, NULL); fspair;
640 fspair = nvlist_next_nvpair(sdd->fss, fspair)) {
641 nvlist_t *fslist;
642 char *fsname;
643 zfs_handle_t *zhp;
644 int err;
645 uint64_t origin_guid = 0;
646 nvlist_t *origin_nv;
647
648 VERIFY(nvpair_value_nvlist(fspair, &fslist) == 0);
649 if (nvlist_lookup_boolean(fslist, "sent") == 0)
650 continue;
651
652 VERIFY(nvlist_lookup_string(fslist, "name", &fsname) == 0);
653 (void) nvlist_lookup_uint64(fslist, "origin", &origin_guid);
654
655 origin_nv = fsavl_find(sdd->fsavl, origin_guid, NULL);
656 if (origin_nv &&
657 nvlist_lookup_boolean(origin_nv, "sent") == ENOENT) {
658 /*
659 * origin has not been sent yet;
660 * skip this clone.
661 */
662 needagain = B_TRUE;
663 continue;
664 }
665
666 zhp = zfs_open(rzhp->zfs_hdl, fsname, ZFS_TYPE_DATASET);
667 if (zhp == NULL)
668 return (-1);
669 err = dump_filesystem(zhp, sdd);
670 VERIFY(nvlist_add_boolean(fslist, "sent") == 0);
671 progress = B_TRUE;
672 zfs_close(zhp);
673 if (err)
674 return (err);
675 }
676 if (needagain) {
677 assert(progress);
678 goto again;
679 }
680 return (0);
681 }
682
683 /*
684 * Dumps a backup of tosnap, incremental from fromsnap if it isn't NULL.
685 * If 'doall', dump all intermediate snaps.
686 * If 'replicate', dump special header and do recursively.
687 */
688 int
689 zfs_send(zfs_handle_t *zhp, const char *fromsnap, const char *tosnap,
690 boolean_t replicate, boolean_t doall, boolean_t fromorigin,
691 boolean_t verbose, int outfd)
692 {
693 char errbuf[1024];
694 send_dump_data_t sdd = { 0 };
695 int err;
696 nvlist_t *fss = NULL;
697 avl_tree_t *fsavl = NULL;
698
699 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
700 "cannot send '%s'"), zhp->zfs_name);
701
702 if (fromsnap && fromsnap[0] == '\0') {
703 zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN,
704 "zero-length incremental source"));
705 return (zfs_error(zhp->zfs_hdl, EZFS_NOENT, errbuf));
706 }
707
708 if (replicate || doall) {
709 dmu_replay_record_t drr = { 0 };
710 char *packbuf = NULL;
711 size_t buflen = 0;
712 zio_cksum_t zc = { 0 };
713
714 assert(fromsnap || doall);
715
716 if (replicate) {
717 nvlist_t *hdrnv;
718
719 VERIFY(0 == nvlist_alloc(&hdrnv, NV_UNIQUE_NAME, 0));
720 if (fromsnap) {
721 VERIFY(0 == nvlist_add_string(hdrnv,
722 "fromsnap", fromsnap));
723 }
724 VERIFY(0 == nvlist_add_string(hdrnv, "tosnap", tosnap));
725
726 err = gather_nvlist(zhp->zfs_hdl, zhp->zfs_name,
727 fromsnap, tosnap, &fss, &fsavl);
728 if (err)
729 return (err);
730 VERIFY(0 == nvlist_add_nvlist(hdrnv, "fss", fss));
731 err = nvlist_pack(hdrnv, &packbuf, &buflen,
732 NV_ENCODE_XDR, 0);
733 nvlist_free(hdrnv);
734 if (err) {
735 fsavl_destroy(fsavl);
736 nvlist_free(fss);
737 return (zfs_standard_error(zhp->zfs_hdl,
738 err, errbuf));
739 }
740 }
741
742 /* write first begin record */
743 drr.drr_type = DRR_BEGIN;
744 drr.drr_u.drr_begin.drr_magic = DMU_BACKUP_MAGIC;
745 drr.drr_u.drr_begin.drr_version = DMU_BACKUP_HEADER_VERSION;
746 (void) snprintf(drr.drr_u.drr_begin.drr_toname,
747 sizeof (drr.drr_u.drr_begin.drr_toname),
748 "%s@%s", zhp->zfs_name, tosnap);
749 drr.drr_payloadlen = buflen;
750 fletcher_4_incremental_native(&drr, sizeof (drr), &zc);
751 err = write(outfd, &drr, sizeof (drr));
752
753 /* write header nvlist */
754 if (err != -1) {
755 fletcher_4_incremental_native(packbuf, buflen, &zc);
756 err = write(outfd, packbuf, buflen);
757 }
758 free(packbuf);
759 if (err == -1) {
760 fsavl_destroy(fsavl);
761 nvlist_free(fss);
762 return (zfs_standard_error(zhp->zfs_hdl,
763 errno, errbuf));
764 }
765
766 /* write end record */
767 if (err != -1) {
768 bzero(&drr, sizeof (drr));
769 drr.drr_type = DRR_END;
770 drr.drr_u.drr_end.drr_checksum = zc;
771 err = write(outfd, &drr, sizeof (drr));
772 if (err == -1) {
773 fsavl_destroy(fsavl);
774 nvlist_free(fss);
775 return (zfs_standard_error(zhp->zfs_hdl,
776 errno, errbuf));
777 }
778 }
779 }
780
781 /* dump each stream */
782 sdd.fromsnap = fromsnap;
783 sdd.tosnap = tosnap;
784 sdd.outfd = outfd;
785 sdd.replicate = replicate;
786 sdd.doall = doall;
787 sdd.fromorigin = fromorigin;
788 sdd.fss = fss;
789 sdd.fsavl = fsavl;
790 sdd.verbose = verbose;
791 err = dump_filesystems(zhp, &sdd);
792 fsavl_destroy(fsavl);
793 nvlist_free(fss);
794
795 if (replicate || doall) {
796 /*
797 * write final end record. NB: want to do this even if
798 * there was some error, because it might not be totally
799 * failed.
800 */
801 dmu_replay_record_t drr = { 0 };
802 drr.drr_type = DRR_END;
803 if (write(outfd, &drr, sizeof (drr)) == -1) {
804 return (zfs_standard_error(zhp->zfs_hdl,
805 errno, errbuf));
806 }
807 }
808
809 return (err || sdd.err);
810 }
811
812 /*
813 * Routines specific to "zfs recv"
814 */
815
816 static int
817 recv_read(libzfs_handle_t *hdl, int fd, void *buf, int ilen,
818 boolean_t byteswap, zio_cksum_t *zc)
819 {
820 char *cp = buf;
821 int rv;
822 int len = ilen;
823
824 do {
825 rv = read(fd, cp, len);
826 cp += rv;
827 len -= rv;
828 } while (rv > 0);
829
830 if (rv < 0 || len != 0) {
831 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
832 "failed to read from stream"));
833 return (zfs_error(hdl, EZFS_BADSTREAM, dgettext(TEXT_DOMAIN,
834 "cannot receive")));
835 }
836
837 if (zc) {
838 if (byteswap)
839 fletcher_4_incremental_byteswap(buf, ilen, zc);
840 else
841 fletcher_4_incremental_native(buf, ilen, zc);
842 }
843 return (0);
844 }
845
846 static int
847 recv_read_nvlist(libzfs_handle_t *hdl, int fd, int len, nvlist_t **nvp,
848 boolean_t byteswap, zio_cksum_t *zc)
849 {
850 char *buf;
851 int err;
852
853 buf = zfs_alloc(hdl, len);
854 if (buf == NULL)
855 return (ENOMEM);
856
857 err = recv_read(hdl, fd, buf, len, byteswap, zc);
858 if (err != 0) {
859 free(buf);
860 return (err);
861 }
862
863 err = nvlist_unpack(buf, len, nvp, 0);
864 free(buf);
865 if (err != 0) {
866 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "invalid "
867 "stream (malformed nvlist)"));
868 return (EINVAL);
869 }
870 return (0);
871 }
872
873 static int
874 recv_rename(libzfs_handle_t *hdl, const char *name, const char *tryname,
875 int baselen, char *newname, recvflags_t flags)
876 {
877 static int seq;
878 zfs_cmd_t zc = { 0 };
879 int err;
880 prop_changelist_t *clp;
881 zfs_handle_t *zhp;
882
883 zhp = zfs_open(hdl, name, ZFS_TYPE_DATASET);
884 if (zhp == NULL)
885 return (-1);
886 clp = changelist_gather(zhp, ZFS_PROP_NAME, 0,
887 flags.force ? MS_FORCE : 0);
888 zfs_close(zhp);
889 if (clp == NULL)
890 return (-1);
891 err = changelist_prefix(clp);
892 if (err)
893 return (err);
894
895 if (tryname) {
896 (void) strcpy(newname, tryname);
897
898 zc.zc_objset_type = DMU_OST_ZFS;
899 (void) strlcpy(zc.zc_name, name, sizeof (zc.zc_name));
900 (void) strlcpy(zc.zc_value, tryname, sizeof (zc.zc_value));
901
902 if (flags.verbose) {
903 (void) printf("attempting rename %s to %s\n",
904 zc.zc_name, zc.zc_value);
905 }
906 err = ioctl(hdl->libzfs_fd, ZFS_IOC_RENAME, &zc);
907 if (err == 0)
908 changelist_rename(clp, name, tryname);
909 } else {
910 err = ENOENT;
911 }
912
913 if (err != 0 && strncmp(name+baselen, "recv-", 5) != 0) {
914 seq++;
915
916 (void) strncpy(newname, name, baselen);
917 (void) snprintf(newname+baselen, ZFS_MAXNAMELEN-baselen,
918 "recv-%u-%u", getpid(), seq);
919 (void) strlcpy(zc.zc_value, newname, sizeof (zc.zc_value));
920
921 if (flags.verbose) {
922 (void) printf("failed - trying rename %s to %s\n",
923 zc.zc_name, zc.zc_value);
924 }
925 err = ioctl(hdl->libzfs_fd, ZFS_IOC_RENAME, &zc);
926 if (err == 0)
927 changelist_rename(clp, name, newname);
928 if (err && flags.verbose) {
929 (void) printf("failed (%u) - "
930 "will try again on next pass\n", errno);
931 }
932 err = EAGAIN;
933 } else if (flags.verbose) {
934 if (err == 0)
935 (void) printf("success\n");
936 else
937 (void) printf("failed (%u)\n", errno);
938 }
939
940 (void) changelist_postfix(clp);
941 changelist_free(clp);
942
943 return (err);
944 }
945
946 static int
947 recv_destroy(libzfs_handle_t *hdl, const char *name, int baselen,
948 char *newname, recvflags_t flags)
949 {
950 zfs_cmd_t zc = { 0 };
951 int err = 0;
952 prop_changelist_t *clp;
953 zfs_handle_t *zhp;
954
955 zhp = zfs_open(hdl, name, ZFS_TYPE_DATASET);
956 if (zhp == NULL)
957 return (-1);
958 clp = changelist_gather(zhp, ZFS_PROP_NAME, 0,
959 flags.force ? MS_FORCE : 0);
960 zfs_close(zhp);
961 if (clp == NULL)
962 return (-1);
963 err = changelist_prefix(clp);
964 if (err)
965 return (err);
966
967 zc.zc_objset_type = DMU_OST_ZFS;
968 (void) strlcpy(zc.zc_name, name, sizeof (zc.zc_name));
969
970 if (flags.verbose)
971 (void) printf("attempting destroy %s\n", zc.zc_name);
972 err = ioctl(hdl->libzfs_fd, ZFS_IOC_DESTROY, &zc);
973
974 if (err == 0) {
975 if (flags.verbose)
976 (void) printf("success\n");
977 changelist_remove(clp, zc.zc_name);
978 }
979
980 (void) changelist_postfix(clp);
981 changelist_free(clp);
982
983 if (err != 0)
984 err = recv_rename(hdl, name, NULL, baselen, newname, flags);
985
986 return (err);
987 }
988
989 typedef struct guid_to_name_data {
990 uint64_t guid;
991 char *name;
992 } guid_to_name_data_t;
993
994 static int
995 guid_to_name_cb(zfs_handle_t *zhp, void *arg)
996 {
997 guid_to_name_data_t *gtnd = arg;
998 int err;
999
1000 if (zhp->zfs_dmustats.dds_guid == gtnd->guid) {
1001 (void) strcpy(gtnd->name, zhp->zfs_name);
1002 return (EEXIST);
1003 }
1004 err = zfs_iter_children(zhp, guid_to_name_cb, gtnd);
1005 zfs_close(zhp);
1006 return (err);
1007 }
1008
1009 static int
1010 guid_to_name(libzfs_handle_t *hdl, const char *parent, uint64_t guid,
1011 char *name)
1012 {
1013 /* exhaustive search all local snapshots */
1014 guid_to_name_data_t gtnd;
1015 int err = 0;
1016 zfs_handle_t *zhp;
1017 char *cp;
1018
1019 gtnd.guid = guid;
1020 gtnd.name = name;
1021
1022 if (strchr(parent, '@') == NULL) {
1023 zhp = make_dataset_handle(hdl, parent);
1024 if (zhp != NULL) {
1025 err = zfs_iter_children(zhp, guid_to_name_cb, &gtnd);
1026 zfs_close(zhp);
1027 if (err == EEXIST)
1028 return (0);
1029 }
1030 }
1031
1032 cp = strchr(parent, '/');
1033 if (cp)
1034 *cp = '\0';
1035 zhp = make_dataset_handle(hdl, parent);
1036 if (cp)
1037 *cp = '/';
1038
1039 if (zhp) {
1040 err = zfs_iter_children(zhp, guid_to_name_cb, &gtnd);
1041 zfs_close(zhp);
1042 }
1043
1044 return (err == EEXIST ? 0 : ENOENT);
1045
1046 }
1047
1048 /*
1049 * Return true if dataset guid1 is created before guid2.
1050 */
1051 static int
1052 created_before(libzfs_handle_t *hdl, avl_tree_t *avl,
1053 uint64_t guid1, uint64_t guid2)
1054 {
1055 nvlist_t *nvfs;
1056 char *fsname, *snapname;
1057 char buf[ZFS_MAXNAMELEN];
1058 int rv;
1059 zfs_node_t zn1, zn2;
1060
1061 if (guid2 == 0)
1062 return (0);
1063 if (guid1 == 0)
1064 return (1);
1065
1066 nvfs = fsavl_find(avl, guid1, &snapname);
1067 VERIFY(0 == nvlist_lookup_string(nvfs, "name", &fsname));
1068 (void) snprintf(buf, sizeof (buf), "%s@%s", fsname, snapname);
1069 zn1.zn_handle = zfs_open(hdl, buf, ZFS_TYPE_SNAPSHOT);
1070 if (zn1.zn_handle == NULL)
1071 return (-1);
1072
1073 nvfs = fsavl_find(avl, guid2, &snapname);
1074 VERIFY(0 == nvlist_lookup_string(nvfs, "name", &fsname));
1075 (void) snprintf(buf, sizeof (buf), "%s@%s", fsname, snapname);
1076 zn2.zn_handle = zfs_open(hdl, buf, ZFS_TYPE_SNAPSHOT);
1077 if (zn2.zn_handle == NULL) {
1078 zfs_close(zn2.zn_handle);
1079 return (-1);
1080 }
1081
1082 rv = (zfs_snapshot_compare(&zn1, &zn2) == -1);
1083
1084 zfs_close(zn1.zn_handle);
1085 zfs_close(zn2.zn_handle);
1086
1087 return (rv);
1088 }
1089
1090 static int
1091 recv_incremental_replication(libzfs_handle_t *hdl, const char *tofs,
1092 recvflags_t flags, nvlist_t *stream_nv, avl_tree_t *stream_avl)
1093 {
1094 nvlist_t *local_nv;
1095 avl_tree_t *local_avl;
1096 nvpair_t *fselem, *nextfselem;
1097 char *tosnap, *fromsnap;
1098 char newname[ZFS_MAXNAMELEN];
1099 int error;
1100 boolean_t needagain, progress;
1101
1102 VERIFY(0 == nvlist_lookup_string(stream_nv, "fromsnap", &fromsnap));
1103 VERIFY(0 == nvlist_lookup_string(stream_nv, "tosnap", &tosnap));
1104
1105 if (flags.dryrun)
1106 return (0);
1107
1108 again:
1109 needagain = progress = B_FALSE;
1110
1111 if ((error = gather_nvlist(hdl, tofs, fromsnap, NULL,
1112 &local_nv, &local_avl)) != 0)
1113 return (error);
1114
1115 /*
1116 * Process deletes and renames
1117 */
1118 for (fselem = nvlist_next_nvpair(local_nv, NULL);
1119 fselem; fselem = nextfselem) {
1120 nvlist_t *nvfs, *snaps;
1121 nvlist_t *stream_nvfs = NULL;
1122 nvpair_t *snapelem, *nextsnapelem;
1123 uint64_t fromguid = 0;
1124 uint64_t originguid = 0;
1125 uint64_t stream_originguid = 0;
1126 uint64_t parent_fromsnap_guid, stream_parent_fromsnap_guid;
1127 char *fsname, *stream_fsname;
1128
1129 nextfselem = nvlist_next_nvpair(local_nv, fselem);
1130
1131 VERIFY(0 == nvpair_value_nvlist(fselem, &nvfs));
1132 VERIFY(0 == nvlist_lookup_nvlist(nvfs, "snaps", &snaps));
1133 VERIFY(0 == nvlist_lookup_string(nvfs, "name", &fsname));
1134 VERIFY(0 == nvlist_lookup_uint64(nvfs, "parentfromsnap",
1135 &parent_fromsnap_guid));
1136 (void) nvlist_lookup_uint64(nvfs, "origin", &originguid);
1137
1138 /*
1139 * First find the stream's fs, so we can check for
1140 * a different origin (due to "zfs promote")
1141 */
1142 for (snapelem = nvlist_next_nvpair(snaps, NULL);
1143 snapelem; snapelem = nvlist_next_nvpair(snaps, snapelem)) {
1144 uint64_t thisguid;
1145
1146 VERIFY(0 == nvpair_value_uint64(snapelem, &thisguid));
1147 stream_nvfs = fsavl_find(stream_avl, thisguid, NULL);
1148
1149 if (stream_nvfs != NULL)
1150 break;
1151 }
1152
1153 /* check for promote */
1154 (void) nvlist_lookup_uint64(stream_nvfs, "origin",
1155 &stream_originguid);
1156 if (stream_nvfs && originguid != stream_originguid) {
1157 switch (created_before(hdl, local_avl,
1158 stream_originguid, originguid)) {
1159 case 1: {
1160 /* promote it! */
1161 zfs_cmd_t zc = { 0 };
1162 nvlist_t *origin_nvfs;
1163 char *origin_fsname;
1164
1165 if (flags.verbose)
1166 (void) printf("promoting %s\n", fsname);
1167
1168 origin_nvfs = fsavl_find(local_avl, originguid,
1169 NULL);
1170 VERIFY(0 == nvlist_lookup_string(origin_nvfs,
1171 "name", &origin_fsname));
1172 (void) strlcpy(zc.zc_value, origin_fsname,
1173 sizeof (zc.zc_value));
1174 (void) strlcpy(zc.zc_name, fsname,
1175 sizeof (zc.zc_name));
1176 error = zfs_ioctl(hdl, ZFS_IOC_PROMOTE, &zc);
1177 if (error == 0)
1178 progress = B_TRUE;
1179 break;
1180 }
1181 default:
1182 break;
1183 case -1:
1184 fsavl_destroy(local_avl);
1185 nvlist_free(local_nv);
1186 return (-1);
1187 }
1188 /*
1189 * We had/have the wrong origin, therefore our
1190 * list of snapshots is wrong. Need to handle
1191 * them on the next pass.
1192 */
1193 needagain = B_TRUE;
1194 continue;
1195 }
1196
1197 for (snapelem = nvlist_next_nvpair(snaps, NULL);
1198 snapelem; snapelem = nextsnapelem) {
1199 uint64_t thisguid;
1200 char *stream_snapname;
1201 nvlist_t *found, *props;
1202
1203 nextsnapelem = nvlist_next_nvpair(snaps, snapelem);
1204
1205 VERIFY(0 == nvpair_value_uint64(snapelem, &thisguid));
1206 found = fsavl_find(stream_avl, thisguid,
1207 &stream_snapname);
1208
1209 /* check for delete */
1210 if (found == NULL) {
1211 char name[ZFS_MAXNAMELEN];
1212
1213 if (!flags.force)
1214 continue;
1215
1216 (void) snprintf(name, sizeof (name), "%s@%s",
1217 fsname, nvpair_name(snapelem));
1218
1219 error = recv_destroy(hdl, name,
1220 strlen(fsname)+1, newname, flags);
1221 if (error)
1222 needagain = B_TRUE;
1223 else
1224 progress = B_TRUE;
1225 continue;
1226 }
1227
1228 stream_nvfs = found;
1229
1230 if (0 == nvlist_lookup_nvlist(stream_nvfs, "snapprops",
1231 &props) && 0 == nvlist_lookup_nvlist(props,
1232 stream_snapname, &props)) {
1233 zfs_cmd_t zc = { 0 };
1234
1235 zc.zc_cookie = B_TRUE; /* clear current props */
1236 (void) snprintf(zc.zc_name, sizeof (zc.zc_name),
1237 "%s@%s", fsname, nvpair_name(snapelem));
1238 if (zcmd_write_src_nvlist(hdl, &zc,
1239 props) == 0) {
1240 (void) zfs_ioctl(hdl,
1241 ZFS_IOC_SET_PROP, &zc);
1242 zcmd_free_nvlists(&zc);
1243 }
1244 }
1245
1246 /* check for different snapname */
1247 if (strcmp(nvpair_name(snapelem),
1248 stream_snapname) != 0) {
1249 char name[ZFS_MAXNAMELEN];
1250 char tryname[ZFS_MAXNAMELEN];
1251
1252 (void) snprintf(name, sizeof (name), "%s@%s",
1253 fsname, nvpair_name(snapelem));
1254 (void) snprintf(tryname, sizeof (name), "%s@%s",
1255 fsname, stream_snapname);
1256
1257 error = recv_rename(hdl, name, tryname,
1258 strlen(fsname)+1, newname, flags);
1259 if (error)
1260 needagain = B_TRUE;
1261 else
1262 progress = B_TRUE;
1263 }
1264
1265 if (strcmp(stream_snapname, fromsnap) == 0)
1266 fromguid = thisguid;
1267 }
1268
1269 /* check for delete */
1270 if (stream_nvfs == NULL) {
1271 if (!flags.force)
1272 continue;
1273
1274 error = recv_destroy(hdl, fsname, strlen(tofs)+1,
1275 newname, flags);
1276 if (error)
1277 needagain = B_TRUE;
1278 else
1279 progress = B_TRUE;
1280 continue;
1281 }
1282
1283 if (fromguid == 0 && flags.verbose) {
1284 (void) printf("local fs %s does not have fromsnap "
1285 "(%s in stream); must have been deleted locally; "
1286 "ignoring\n", fsname, fromsnap);
1287 continue;
1288 }
1289
1290 VERIFY(0 == nvlist_lookup_string(stream_nvfs,
1291 "name", &stream_fsname));
1292 VERIFY(0 == nvlist_lookup_uint64(stream_nvfs,
1293 "parentfromsnap", &stream_parent_fromsnap_guid));
1294
1295 /* check for rename */
1296 if ((stream_parent_fromsnap_guid != 0 &&
1297 stream_parent_fromsnap_guid != parent_fromsnap_guid) ||
1298 strcmp(strrchr(fsname, '/'),
1299 strrchr(stream_fsname, '/')) != 0) {
1300 nvlist_t *parent;
1301 char tryname[ZFS_MAXNAMELEN];
1302
1303 parent = fsavl_find(local_avl,
1304 stream_parent_fromsnap_guid, NULL);
1305 /*
1306 * NB: parent might not be found if we used the
1307 * tosnap for stream_parent_fromsnap_guid,
1308 * because the parent is a newly-created fs;
1309 * we'll be able to rename it after we recv the
1310 * new fs.
1311 */
1312 if (parent != NULL) {
1313 char *pname;
1314
1315 VERIFY(0 == nvlist_lookup_string(parent, "name",
1316 &pname));
1317 (void) snprintf(tryname, sizeof (tryname),
1318 "%s%s", pname, strrchr(stream_fsname, '/'));
1319 } else {
1320 tryname[0] = '\0';
1321 if (flags.verbose) {
1322 (void) printf("local fs %s new parent "
1323 "not found\n", fsname);
1324 }
1325 }
1326
1327 error = recv_rename(hdl, fsname, tryname,
1328 strlen(tofs)+1, newname, flags);
1329 if (error)
1330 needagain = B_TRUE;
1331 else
1332 progress = B_TRUE;
1333 }
1334 }
1335
1336 fsavl_destroy(local_avl);
1337 nvlist_free(local_nv);
1338
1339 if (needagain && progress) {
1340 /* do another pass to fix up temporary names */
1341 if (flags.verbose)
1342 (void) printf("another pass:\n");
1343 goto again;
1344 }
1345
1346 return (needagain);
1347 }
1348
1349 static int
1350 zfs_receive_package(libzfs_handle_t *hdl, int fd, const char *destname,
1351 recvflags_t flags, dmu_replay_record_t *drr, zio_cksum_t *zc,
1352 char **top_zfs)
1353 {
1354 nvlist_t *stream_nv = NULL;
1355 avl_tree_t *stream_avl = NULL;
1356 char *fromsnap = NULL;
1357 char tofs[ZFS_MAXNAMELEN];
1358 char errbuf[1024];
1359 dmu_replay_record_t drre;
1360 int error;
1361 boolean_t anyerr = B_FALSE;
1362 boolean_t softerr = B_FALSE;
1363
1364 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
1365 "cannot receive"));
1366
1367 if (strchr(destname, '@')) {
1368 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1369 "can not specify snapshot name for multi-snapshot stream"));
1370 return (zfs_error(hdl, EZFS_BADSTREAM, errbuf));
1371 }
1372
1373 assert(drr->drr_type == DRR_BEGIN);
1374 assert(drr->drr_u.drr_begin.drr_magic == DMU_BACKUP_MAGIC);
1375 assert(drr->drr_u.drr_begin.drr_version == DMU_BACKUP_HEADER_VERSION);
1376
1377 /*
1378 * Read in the nvlist from the stream.
1379 */
1380 if (drr->drr_payloadlen != 0) {
1381 if (!flags.isprefix) {
1382 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1383 "must use -d to receive replication "
1384 "(send -R) stream"));
1385 return (zfs_error(hdl, EZFS_BADSTREAM, errbuf));
1386 }
1387
1388 error = recv_read_nvlist(hdl, fd, drr->drr_payloadlen,
1389 &stream_nv, flags.byteswap, zc);
1390 if (error) {
1391 error = zfs_error(hdl, EZFS_BADSTREAM, errbuf);
1392 goto out;
1393 }
1394 }
1395
1396 /*
1397 * Read in the end record and verify checksum.
1398 */
1399 if (0 != (error = recv_read(hdl, fd, &drre, sizeof (drre),
1400 flags.byteswap, NULL)))
1401 goto out;
1402 if (flags.byteswap) {
1403 drre.drr_type = BSWAP_32(drre.drr_type);
1404 drre.drr_u.drr_end.drr_checksum.zc_word[0] =
1405 BSWAP_64(drre.drr_u.drr_end.drr_checksum.zc_word[0]);
1406 drre.drr_u.drr_end.drr_checksum.zc_word[1] =
1407 BSWAP_64(drre.drr_u.drr_end.drr_checksum.zc_word[1]);
1408 drre.drr_u.drr_end.drr_checksum.zc_word[2] =
1409 BSWAP_64(drre.drr_u.drr_end.drr_checksum.zc_word[2]);
1410 drre.drr_u.drr_end.drr_checksum.zc_word[3] =
1411 BSWAP_64(drre.drr_u.drr_end.drr_checksum.zc_word[3]);
1412 }
1413 if (drre.drr_type != DRR_END) {
1414 error = zfs_error(hdl, EZFS_BADSTREAM, errbuf);
1415 goto out;
1416 }
1417 if (!ZIO_CHECKSUM_EQUAL(drre.drr_u.drr_end.drr_checksum, *zc)) {
1418 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1419 "incorrect header checksum"));
1420 error = zfs_error(hdl, EZFS_BADSTREAM, errbuf);
1421 goto out;
1422 }
1423
1424 (void) nvlist_lookup_string(stream_nv, "fromsnap", &fromsnap);
1425
1426 if (drr->drr_payloadlen != 0) {
1427 nvlist_t *stream_fss;
1428
1429 VERIFY(0 == nvlist_lookup_nvlist(stream_nv, "fss",
1430 &stream_fss));
1431 if ((stream_avl = fsavl_create(stream_fss)) == NULL) {
1432 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1433 "couldn't allocate avl tree"));
1434 error = zfs_error(hdl, EZFS_NOMEM, errbuf);
1435 goto out;
1436 }
1437
1438 if (fromsnap != NULL) {
1439 (void) strlcpy(tofs, destname, ZFS_MAXNAMELEN);
1440 if (flags.isprefix) {
1441 int i = strcspn(drr->drr_u.drr_begin.drr_toname,
1442 "/@");
1443 /* zfs_receive_one() will create_parents() */
1444 (void) strlcat(tofs,
1445 &drr->drr_u.drr_begin.drr_toname[i],
1446 ZFS_MAXNAMELEN);
1447 *strchr(tofs, '@') = '\0';
1448 }
1449 softerr = recv_incremental_replication(hdl, tofs,
1450 flags, stream_nv, stream_avl);
1451 }
1452 }
1453
1454
1455 /* Finally, receive each contained stream */
1456 do {
1457 /*
1458 * we should figure out if it has a recoverable
1459 * error, in which case do a recv_skip() and drive on.
1460 * Note, if we fail due to already having this guid,
1461 * zfs_receive_one() will take care of it (ie,
1462 * recv_skip() and return 0).
1463 */
1464 error = zfs_receive_impl(hdl, destname, flags, fd,
1465 stream_avl, top_zfs);
1466 if (error == ENODATA) {
1467 error = 0;
1468 break;
1469 }
1470 anyerr |= error;
1471 } while (error == 0);
1472
1473 if (drr->drr_payloadlen != 0 && fromsnap != NULL) {
1474 /*
1475 * Now that we have the fs's they sent us, try the
1476 * renames again.
1477 */
1478 softerr = recv_incremental_replication(hdl, tofs, flags,
1479 stream_nv, stream_avl);
1480 }
1481
1482 out:
1483 fsavl_destroy(stream_avl);
1484 if (stream_nv)
1485 nvlist_free(stream_nv);
1486 if (softerr)
1487 error = -2;
1488 if (anyerr)
1489 error = -1;
1490 return (error);
1491 }
1492
1493 static int
1494 recv_skip(libzfs_handle_t *hdl, int fd, boolean_t byteswap)
1495 {
1496 dmu_replay_record_t *drr;
1497 void *buf = malloc(1<<20);
1498
1499 /* XXX would be great to use lseek if possible... */
1500 drr = buf;
1501
1502 while (recv_read(hdl, fd, drr, sizeof (dmu_replay_record_t),
1503 byteswap, NULL) == 0) {
1504 if (byteswap)
1505 drr->drr_type = BSWAP_32(drr->drr_type);
1506
1507 switch (drr->drr_type) {
1508 case DRR_BEGIN:
1509 /* NB: not to be used on v2 stream packages */
1510 assert(drr->drr_payloadlen == 0);
1511 break;
1512
1513 case DRR_END:
1514 free(buf);
1515 return (0);
1516
1517 case DRR_OBJECT:
1518 if (byteswap) {
1519 drr->drr_u.drr_object.drr_bonuslen =
1520 BSWAP_32(drr->drr_u.drr_object.
1521 drr_bonuslen);
1522 }
1523 (void) recv_read(hdl, fd, buf,
1524 P2ROUNDUP(drr->drr_u.drr_object.drr_bonuslen, 8),
1525 B_FALSE, NULL);
1526 break;
1527
1528 case DRR_WRITE:
1529 if (byteswap) {
1530 drr->drr_u.drr_write.drr_length =
1531 BSWAP_64(drr->drr_u.drr_write.drr_length);
1532 }
1533 (void) recv_read(hdl, fd, buf,
1534 drr->drr_u.drr_write.drr_length, B_FALSE, NULL);
1535 break;
1536
1537 case DRR_FREEOBJECTS:
1538 case DRR_FREE:
1539 break;
1540
1541 default:
1542 assert(!"invalid record type");
1543 }
1544 }
1545
1546 free(buf);
1547 return (-1);
1548 }
1549
1550 /*
1551 * Restores a backup of tosnap from the file descriptor specified by infd.
1552 */
1553 static int
1554 zfs_receive_one(libzfs_handle_t *hdl, int infd, const char *tosnap,
1555 recvflags_t flags, dmu_replay_record_t *drr,
1556 dmu_replay_record_t *drr_noswap, avl_tree_t *stream_avl,
1557 char **top_zfs)
1558 {
1559 zfs_cmd_t zc = { 0 };
1560 time_t begin_time;
1561 int ioctl_err, ioctl_errno, err, choplen;
1562 char *cp;
1563 struct drr_begin *drrb = &drr->drr_u.drr_begin;
1564 char errbuf[1024];
1565 char chopprefix[ZFS_MAXNAMELEN];
1566 boolean_t newfs = B_FALSE;
1567 boolean_t stream_wantsnewfs;
1568 uint64_t parent_snapguid = 0;
1569 prop_changelist_t *clp = NULL;
1570 nvlist_t *snapprops_nvlist = NULL;
1571
1572 begin_time = time(NULL);
1573
1574 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
1575 "cannot receive"));
1576
1577 if (stream_avl != NULL) {
1578 char *snapname;
1579 nvlist_t *fs = fsavl_find(stream_avl, drrb->drr_toguid,
1580 &snapname);
1581 nvlist_t *props;
1582 int ret;
1583
1584 (void) nvlist_lookup_uint64(fs, "parentfromsnap",
1585 &parent_snapguid);
1586 err = nvlist_lookup_nvlist(fs, "props", &props);
1587 if (err)
1588 VERIFY(0 == nvlist_alloc(&props, NV_UNIQUE_NAME, 0));
1589
1590 if (flags.canmountoff) {
1591 VERIFY(0 == nvlist_add_uint64(props,
1592 zfs_prop_to_name(ZFS_PROP_CANMOUNT), 0));
1593 }
1594 ret = zcmd_write_src_nvlist(hdl, &zc, props);
1595 if (err)
1596 nvlist_free(props);
1597
1598 if (0 == nvlist_lookup_nvlist(fs, "snapprops", &props)) {
1599 VERIFY(0 == nvlist_lookup_nvlist(props,
1600 snapname, &snapprops_nvlist));
1601 }
1602
1603 if (ret != 0)
1604 return (-1);
1605 }
1606
1607 /*
1608 * Determine how much of the snapshot name stored in the stream
1609 * we are going to tack on to the name they specified on the
1610 * command line, and how much we are going to chop off.
1611 *
1612 * If they specified a snapshot, chop the entire name stored in
1613 * the stream.
1614 */
1615 (void) strcpy(chopprefix, drrb->drr_toname);
1616 if (flags.isprefix) {
1617 /*
1618 * They specified a fs with -d, we want to tack on
1619 * everything but the pool name stored in the stream
1620 */
1621 if (strchr(tosnap, '@')) {
1622 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "invalid "
1623 "argument - snapshot not allowed with -d"));
1624 return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf));
1625 }
1626 cp = strchr(chopprefix, '/');
1627 if (cp == NULL)
1628 cp = strchr(chopprefix, '@');
1629 *cp = '\0';
1630 } else if (strchr(tosnap, '@') == NULL) {
1631 /*
1632 * If they specified a filesystem without -d, we want to
1633 * tack on everything after the fs specified in the
1634 * first name from the stream.
1635 */
1636 cp = strchr(chopprefix, '@');
1637 *cp = '\0';
1638 }
1639 choplen = strlen(chopprefix);
1640
1641 /*
1642 * Determine name of destination snapshot, store in zc_value.
1643 */
1644 (void) strcpy(zc.zc_value, tosnap);
1645 (void) strncat(zc.zc_value, drrb->drr_toname+choplen,
1646 sizeof (zc.zc_value));
1647 if (!zfs_name_valid(zc.zc_value, ZFS_TYPE_SNAPSHOT)) {
1648 zcmd_free_nvlists(&zc);
1649 return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf));
1650 }
1651
1652 /*
1653 * Determine the name of the origin snapshot, store in zc_string.
1654 */
1655 if (drrb->drr_flags & DRR_FLAG_CLONE) {
1656 if (guid_to_name(hdl, tosnap,
1657 drrb->drr_fromguid, zc.zc_string) != 0) {
1658 zcmd_free_nvlists(&zc);
1659 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1660 "local origin for clone %s does not exist"),
1661 zc.zc_value);
1662 return (zfs_error(hdl, EZFS_NOENT, errbuf));
1663 }
1664 if (flags.verbose)
1665 (void) printf("found clone origin %s\n", zc.zc_string);
1666 }
1667
1668 stream_wantsnewfs = (drrb->drr_fromguid == NULL ||
1669 (drrb->drr_flags & DRR_FLAG_CLONE));
1670
1671 if (stream_wantsnewfs) {
1672 /*
1673 * if the parent fs does not exist, look for it based on
1674 * the parent snap GUID
1675 */
1676 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
1677 "cannot receive new filesystem stream"));
1678
1679 (void) strcpy(zc.zc_name, zc.zc_value);
1680 cp = strrchr(zc.zc_name, '/');
1681 if (cp)
1682 *cp = '\0';
1683 if (cp &&
1684 !zfs_dataset_exists(hdl, zc.zc_name, ZFS_TYPE_DATASET)) {
1685 char suffix[ZFS_MAXNAMELEN];
1686 (void) strcpy(suffix, strrchr(zc.zc_value, '/'));
1687 if (guid_to_name(hdl, tosnap, parent_snapguid,
1688 zc.zc_value) == 0) {
1689 *strchr(zc.zc_value, '@') = '\0';
1690 (void) strcat(zc.zc_value, suffix);
1691 }
1692 }
1693 } else {
1694 /*
1695 * if the fs does not exist, look for it based on the
1696 * fromsnap GUID
1697 */
1698 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
1699 "cannot receive incremental stream"));
1700
1701 (void) strcpy(zc.zc_name, zc.zc_value);
1702 *strchr(zc.zc_name, '@') = '\0';
1703
1704 if (!zfs_dataset_exists(hdl, zc.zc_name, ZFS_TYPE_DATASET)) {
1705 char snap[ZFS_MAXNAMELEN];
1706 (void) strcpy(snap, strchr(zc.zc_value, '@'));
1707 if (guid_to_name(hdl, tosnap, drrb->drr_fromguid,
1708 zc.zc_value) == 0) {
1709 *strchr(zc.zc_value, '@') = '\0';
1710 (void) strcat(zc.zc_value, snap);
1711 }
1712 }
1713 }
1714
1715 (void) strcpy(zc.zc_name, zc.zc_value);
1716 *strchr(zc.zc_name, '@') = '\0';
1717
1718 if (zfs_dataset_exists(hdl, zc.zc_name, ZFS_TYPE_DATASET)) {
1719 zfs_handle_t *zhp;
1720 /*
1721 * Destination fs exists. Therefore this should either
1722 * be an incremental, or the stream specifies a new fs
1723 * (full stream or clone) and they want us to blow it
1724 * away (and have therefore specified -F and removed any
1725 * snapshots).
1726 */
1727
1728 if (stream_wantsnewfs) {
1729 if (!flags.force) {
1730 zcmd_free_nvlists(&zc);
1731 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1732 "destination '%s' exists\n"
1733 "must specify -F to overwrite it"),
1734 zc.zc_name);
1735 return (zfs_error(hdl, EZFS_EXISTS, errbuf));
1736 }
1737 if (ioctl(hdl->libzfs_fd, ZFS_IOC_SNAPSHOT_LIST_NEXT,
1738 &zc) == 0) {
1739 zcmd_free_nvlists(&zc);
1740 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1741 "destination has snapshots (eg. %s)\n"
1742 "must destroy them to overwrite it"),
1743 zc.zc_name);
1744 return (zfs_error(hdl, EZFS_EXISTS, errbuf));
1745 }
1746 }
1747
1748 if ((zhp = zfs_open(hdl, zc.zc_name,
1749 ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME)) == NULL) {
1750 zcmd_free_nvlists(&zc);
1751 return (-1);
1752 }
1753
1754 if (stream_wantsnewfs &&
1755 zhp->zfs_dmustats.dds_origin[0]) {
1756 zcmd_free_nvlists(&zc);
1757 zfs_close(zhp);
1758 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1759 "destination '%s' is a clone\n"
1760 "must destroy it to overwrite it"),
1761 zc.zc_name);
1762 return (zfs_error(hdl, EZFS_EXISTS, errbuf));
1763 }
1764
1765 if (!flags.dryrun && zhp->zfs_type == ZFS_TYPE_FILESYSTEM &&
1766 stream_wantsnewfs) {
1767 /* We can't do online recv in this case */
1768 clp = changelist_gather(zhp, ZFS_PROP_NAME, 0, 0);
1769 if (clp == NULL) {
1770 zcmd_free_nvlists(&zc);
1771 return (-1);
1772 }
1773 if (changelist_prefix(clp) != 0) {
1774 changelist_free(clp);
1775 zcmd_free_nvlists(&zc);
1776 return (-1);
1777 }
1778 }
1779 if (!flags.dryrun && zhp->zfs_type == ZFS_TYPE_VOLUME &&
1780 zvol_remove_link(hdl, zhp->zfs_name) != 0) {
1781 zfs_close(zhp);
1782 zcmd_free_nvlists(&zc);
1783 return (-1);
1784 }
1785 zfs_close(zhp);
1786 } else {
1787 /*
1788 * Destination filesystem does not exist. Therefore we better
1789 * be creating a new filesystem (either from a full backup, or
1790 * a clone). It would therefore be invalid if the user
1791 * specified only the pool name (i.e. if the destination name
1792 * contained no slash character).
1793 */
1794 if (!stream_wantsnewfs ||
1795 (cp = strrchr(zc.zc_name, '/')) == NULL) {
1796 zcmd_free_nvlists(&zc);
1797 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1798 "destination '%s' does not exist"), zc.zc_name);
1799 return (zfs_error(hdl, EZFS_NOENT, errbuf));
1800 }
1801
1802 /*
1803 * Trim off the final dataset component so we perform the
1804 * recvbackup ioctl to the filesystems's parent.
1805 */
1806 *cp = '\0';
1807
1808 if (flags.isprefix && !flags.dryrun &&
1809 create_parents(hdl, zc.zc_value, strlen(tosnap)) != 0) {
1810 zcmd_free_nvlists(&zc);
1811 return (zfs_error(hdl, EZFS_BADRESTORE, errbuf));
1812 }
1813
1814 newfs = B_TRUE;
1815 }
1816
1817 zc.zc_begin_record = drr_noswap->drr_u.drr_begin;
1818 zc.zc_cookie = infd;
1819 zc.zc_guid = flags.force;
1820 if (flags.verbose) {
1821 (void) printf("%s %s stream of %s into %s\n",
1822 flags.dryrun ? "would receive" : "receiving",
1823 drrb->drr_fromguid ? "incremental" : "full",
1824 drrb->drr_toname, zc.zc_value);
1825 (void) fflush(stdout);
1826 }
1827
1828 if (flags.dryrun) {
1829 zcmd_free_nvlists(&zc);
1830 return (recv_skip(hdl, infd, flags.byteswap));
1831 }
1832
1833 err = ioctl_err = zfs_ioctl(hdl, ZFS_IOC_RECV, &zc);
1834 ioctl_errno = errno;
1835 zcmd_free_nvlists(&zc);
1836
1837 if (err == 0 && snapprops_nvlist) {
1838 zfs_cmd_t zc2 = { 0 };
1839
1840 (void) strcpy(zc2.zc_name, zc.zc_value);
1841 if (zcmd_write_src_nvlist(hdl, &zc2, snapprops_nvlist) == 0) {
1842 (void) zfs_ioctl(hdl, ZFS_IOC_SET_PROP, &zc2);
1843 zcmd_free_nvlists(&zc2);
1844 }
1845 }
1846
1847 if (err && (ioctl_errno == ENOENT || ioctl_errno == ENODEV)) {
1848 /*
1849 * It may be that this snapshot already exists,
1850 * in which case we want to consume & ignore it
1851 * rather than failing.
1852 */
1853 avl_tree_t *local_avl;
1854 nvlist_t *local_nv, *fs;
1855 char *cp = strchr(zc.zc_value, '@');
1856
1857 /*
1858 * XXX Do this faster by just iterating over snaps in
1859 * this fs. Also if zc_value does not exist, we will
1860 * get a strange "does not exist" error message.
1861 */
1862 *cp = '\0';
1863 if (gather_nvlist(hdl, zc.zc_value, NULL, NULL,
1864 &local_nv, &local_avl) == 0) {
1865 *cp = '@';
1866 fs = fsavl_find(local_avl, drrb->drr_toguid, NULL);
1867 fsavl_destroy(local_avl);
1868 nvlist_free(local_nv);
1869
1870 if (fs != NULL) {
1871 if (flags.verbose) {
1872 (void) printf("snap %s already exists; "
1873 "ignoring\n", zc.zc_value);
1874 }
1875 ioctl_err = recv_skip(hdl, infd,
1876 flags.byteswap);
1877 }
1878 }
1879 *cp = '@';
1880 }
1881
1882
1883 if (ioctl_err != 0) {
1884 switch (ioctl_errno) {
1885 case ENODEV:
1886 cp = strchr(zc.zc_value, '@');
1887 *cp = '\0';
1888 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1889 "most recent snapshot of %s does not\n"
1890 "match incremental source"), zc.zc_value);
1891 (void) zfs_error(hdl, EZFS_BADRESTORE, errbuf);
1892 *cp = '@';
1893 break;
1894 case ETXTBSY:
1895 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1896 "destination %s has been modified\n"
1897 "since most recent snapshot"), zc.zc_name);
1898 (void) zfs_error(hdl, EZFS_BADRESTORE, errbuf);
1899 break;
1900 case EEXIST:
1901 cp = strchr(zc.zc_value, '@');
1902 if (newfs) {
1903 /* it's the containing fs that exists */
1904 *cp = '\0';
1905 }
1906 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1907 "destination already exists"));
1908 (void) zfs_error_fmt(hdl, EZFS_EXISTS,
1909 dgettext(TEXT_DOMAIN, "cannot restore to %s"),
1910 zc.zc_value);
1911 *cp = '@';
1912 break;
1913 case EINVAL:
1914 (void) zfs_error(hdl, EZFS_BADSTREAM, errbuf);
1915 break;
1916 case ECKSUM:
1917 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1918 "invalid stream (checksum mismatch)"));
1919 (void) zfs_error(hdl, EZFS_BADSTREAM, errbuf);
1920 break;
1921 default:
1922 (void) zfs_standard_error(hdl, ioctl_errno, errbuf);
1923 }
1924 }
1925
1926 /*
1927 * Mount or recreate the /dev links for the target filesystem
1928 * (if created, or if we tore them down to do an incremental
1929 * restore), and the /dev links for the new snapshot (if
1930 * created). Also mount any children of the target filesystem
1931 * if we did an incremental receive.
1932 */
1933 cp = strchr(zc.zc_value, '@');
1934 if (cp && (ioctl_err == 0 || !newfs)) {
1935 zfs_handle_t *h;
1936
1937 *cp = '\0';
1938 h = zfs_open(hdl, zc.zc_value,
1939 ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME);
1940 if (h != NULL) {
1941 if (h->zfs_type == ZFS_TYPE_VOLUME) {
1942 *cp = '@';
1943 err = zvol_create_link(hdl, h->zfs_name);
1944 if (err == 0 && ioctl_err == 0)
1945 err = zvol_create_link(hdl,
1946 zc.zc_value);
1947 } else if (newfs) {
1948 /*
1949 * Track the first/top of hierarchy fs,
1950 * for mounting and sharing later.
1951 */
1952 if (top_zfs && *top_zfs == NULL)
1953 *top_zfs = zfs_strdup(hdl, zc.zc_value);
1954 }
1955 zfs_close(h);
1956 }
1957 *cp = '@';
1958 }
1959
1960 if (clp) {
1961 err |= changelist_postfix(clp);
1962 changelist_free(clp);
1963 }
1964
1965 if (err || ioctl_err)
1966 return (-1);
1967
1968 if (flags.verbose) {
1969 char buf1[64];
1970 char buf2[64];
1971 uint64_t bytes = zc.zc_cookie;
1972 time_t delta = time(NULL) - begin_time;
1973 if (delta == 0)
1974 delta = 1;
1975 zfs_nicenum(bytes, buf1, sizeof (buf1));
1976 zfs_nicenum(bytes/delta, buf2, sizeof (buf1));
1977
1978 (void) printf("received %sB stream in %lu seconds (%sB/sec)\n",
1979 buf1, delta, buf2);
1980 }
1981
1982 return (0);
1983 }
1984
1985 static int
1986 zfs_receive_impl(libzfs_handle_t *hdl, const char *tosnap, recvflags_t flags,
1987 int infd, avl_tree_t *stream_avl, char **top_zfs)
1988 {
1989 int err;
1990 dmu_replay_record_t drr, drr_noswap;
1991 struct drr_begin *drrb = &drr.drr_u.drr_begin;
1992 char errbuf[1024];
1993 zio_cksum_t zcksum = { 0 };
1994
1995 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
1996 "cannot receive"));
1997
1998 if (flags.isprefix &&
1999 !zfs_dataset_exists(hdl, tosnap, ZFS_TYPE_DATASET)) {
2000 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "specified fs "
2001 "(%s) does not exist"), tosnap);
2002 return (zfs_error(hdl, EZFS_NOENT, errbuf));
2003 }
2004
2005 /* read in the BEGIN record */
2006 if (0 != (err = recv_read(hdl, infd, &drr, sizeof (drr), B_FALSE,
2007 &zcksum)))
2008 return (err);
2009
2010 if (drr.drr_type == DRR_END || drr.drr_type == BSWAP_32(DRR_END)) {
2011 /* It's the double end record at the end of a package */
2012 return (ENODATA);
2013 }
2014
2015 /* the kernel needs the non-byteswapped begin record */
2016 drr_noswap = drr;
2017
2018 flags.byteswap = B_FALSE;
2019 if (drrb->drr_magic == BSWAP_64(DMU_BACKUP_MAGIC)) {
2020 /*
2021 * We computed the checksum in the wrong byteorder in
2022 * recv_read() above; do it again correctly.
2023 */
2024 bzero(&zcksum, sizeof (zio_cksum_t));
2025 fletcher_4_incremental_byteswap(&drr, sizeof (drr), &zcksum);
2026 flags.byteswap = B_TRUE;
2027
2028 drr.drr_type = BSWAP_32(drr.drr_type);
2029 drr.drr_payloadlen = BSWAP_32(drr.drr_payloadlen);
2030 drrb->drr_magic = BSWAP_64(drrb->drr_magic);
2031 drrb->drr_version = BSWAP_64(drrb->drr_version);
2032 drrb->drr_creation_time = BSWAP_64(drrb->drr_creation_time);
2033 drrb->drr_type = BSWAP_32(drrb->drr_type);
2034 drrb->drr_flags = BSWAP_32(drrb->drr_flags);
2035 drrb->drr_toguid = BSWAP_64(drrb->drr_toguid);
2036 drrb->drr_fromguid = BSWAP_64(drrb->drr_fromguid);
2037 }
2038
2039 if (drrb->drr_magic != DMU_BACKUP_MAGIC || drr.drr_type != DRR_BEGIN) {
2040 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "invalid "
2041 "stream (bad magic number)"));
2042 return (zfs_error(hdl, EZFS_BADSTREAM, errbuf));
2043 }
2044
2045 if (strchr(drrb->drr_toname, '@') == NULL) {
2046 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "invalid "
2047 "stream (bad snapshot name)"));
2048 return (zfs_error(hdl, EZFS_BADSTREAM, errbuf));
2049 }
2050
2051 if (drrb->drr_version == DMU_BACKUP_STREAM_VERSION) {
2052 return (zfs_receive_one(hdl, infd, tosnap, flags,
2053 &drr, &drr_noswap, stream_avl, top_zfs));
2054 } else if (drrb->drr_version == DMU_BACKUP_HEADER_VERSION) {
2055 return (zfs_receive_package(hdl, infd, tosnap, flags,
2056 &drr, &zcksum, top_zfs));
2057 } else {
2058 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
2059 "stream is unsupported version %llu"),
2060 drrb->drr_version);
2061 return (zfs_error(hdl, EZFS_BADSTREAM, errbuf));
2062 }
2063 }
2064
2065 /*
2066 * Restores a backup of tosnap from the file descriptor specified by infd.
2067 * Return 0 on total success, -2 if some things couldn't be
2068 * destroyed/renamed/promoted, -1 if some things couldn't be received.
2069 * (-1 will override -2).
2070 */
2071 int
2072 zfs_receive(libzfs_handle_t *hdl, const char *tosnap, recvflags_t flags,
2073 int infd, avl_tree_t *stream_avl)
2074 {
2075 char *top_zfs = NULL;
2076 int err;
2077
2078 err = zfs_receive_impl(hdl, tosnap, flags, infd, stream_avl, &top_zfs);
2079
2080 if (err == 0 && !flags.nomount && top_zfs) {
2081 zfs_handle_t *zhp;
2082 prop_changelist_t *clp;
2083
2084 zhp = zfs_open(hdl, top_zfs, ZFS_TYPE_FILESYSTEM);
2085 if (zhp != NULL) {
2086 clp = changelist_gather(zhp, ZFS_PROP_MOUNTPOINT,
2087 CL_GATHER_MOUNT_ALWAYS, 0);
2088 zfs_close(zhp);
2089 if (clp != NULL) {
2090 /* mount and share received datasets */
2091 err = changelist_postfix(clp);
2092 changelist_free(clp);
2093 }
2094 }
2095 if (zhp == NULL || clp == NULL || err)
2096 err = -1;
2097 }
2098 if (top_zfs)
2099 free(top_zfs);
2100
2101 return (err);
2102 }
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