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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 /*
117 * Given an nvlist, produce an avl tree of snapshots, ordered by guid
118 */
119 static avl_tree_t *
120 fsavl_create(nvlist_t *fss)
121 {
122 avl_tree_t *fsavl;
123 nvpair_t *fselem = NULL;
124
125 if ((fsavl = malloc(sizeof (avl_tree_t))) == NULL)
126 return (NULL);
127
128 avl_create(fsavl, fsavl_compare, sizeof (fsavl_node_t),
129 offsetof(fsavl_node_t, fn_node));
130
131 while ((fselem = nvlist_next_nvpair(fss, fselem)) != NULL) {
132 nvlist_t *nvfs, *snaps;
133 nvpair_t *snapelem = NULL;
134
135 VERIFY(0 == nvpair_value_nvlist(fselem, &nvfs));
136 VERIFY(0 == nvlist_lookup_nvlist(nvfs, "snaps", &snaps));
137
138 while ((snapelem =
139 nvlist_next_nvpair(snaps, snapelem)) != NULL) {
140 fsavl_node_t *fn;
141 uint64_t guid;
142
143 VERIFY(0 == nvpair_value_uint64(snapelem, &guid));
144 if ((fn = malloc(sizeof (fsavl_node_t))) == NULL) {
145 fsavl_destroy(fsavl);
146 return (NULL);
147 }
148 fn->fn_nvfs = nvfs;
149 fn->fn_snapname = nvpair_name(snapelem);
150 fn->fn_guid = guid;
151
152 /*
153 * Note: if there are multiple snaps with the
154 * same GUID, we ignore all but one.
155 */
156 if (avl_find(fsavl, fn, NULL) == NULL)
157 avl_add(fsavl, fn);
158 else
159 free(fn);
160 }
161 }
162
163 return (fsavl);
164 }
165
166 /*
167 * Routines for dealing with the giant nvlist of fs-nvlists, etc.
168 */
169 typedef struct send_data {
170 uint64_t parent_fromsnap_guid;
171 nvlist_t *parent_snaps;
172 nvlist_t *fss;
173 nvlist_t *snapprops;
174 const char *fromsnap;
175 const char *tosnap;
176
177 /*
178 * The header nvlist is of the following format:
179 * {
180 * "tosnap" -> string
181 * "fromsnap" -> string (if incremental)
182 * "fss" -> {
183 * id -> {
184 *
185 * "name" -> string (full name; for debugging)
186 * "parentfromsnap" -> number (guid of fromsnap in parent)
187 *
188 * "props" -> { name -> value (only if set here) }
189 * "snaps" -> { name (lastname) -> number (guid) }
190 * "snapprops" -> { name (lastname) -> { name -> value } }
191 *
192 * "origin" -> number (guid) (if clone)
193 * "sent" -> boolean (not on-disk)
194 * }
195 * }
196 * }
197 *
198 */
199 } send_data_t;
200
201 static void send_iterate_prop(zfs_handle_t *zhp, nvlist_t *nv);
202
203 static int
204 send_iterate_snap(zfs_handle_t *zhp, void *arg)
205 {
206 send_data_t *sd = arg;
207 uint64_t guid = zhp->zfs_dmustats.dds_guid;
208 char *snapname;
209 nvlist_t *nv;
210
211 snapname = strrchr(zhp->zfs_name, '@')+1;
212
213 VERIFY(0 == nvlist_add_uint64(sd->parent_snaps, snapname, guid));
214 /*
215 * NB: if there is no fromsnap here (it's a newly created fs in
216 * an incremental replication), we will substitute the tosnap.
217 */
218 if ((sd->fromsnap && strcmp(snapname, sd->fromsnap) == 0) ||
219 (sd->parent_fromsnap_guid == 0 && sd->tosnap &&
220 strcmp(snapname, sd->tosnap) == 0)) {
221 sd->parent_fromsnap_guid = guid;
222 }
223
224 VERIFY(0 == nvlist_alloc(&nv, NV_UNIQUE_NAME, 0));
225 send_iterate_prop(zhp, nv);
226 VERIFY(0 == nvlist_add_nvlist(sd->snapprops, snapname, nv));
227 nvlist_free(nv);
228
229 zfs_close(zhp);
230 return (0);
231 }
232
233 static void
234 send_iterate_prop(zfs_handle_t *zhp, nvlist_t *nv)
235 {
236 nvpair_t *elem = NULL;
237
238 while ((elem = nvlist_next_nvpair(zhp->zfs_props, elem)) != NULL) {
239 char *propname = nvpair_name(elem);
240 zfs_prop_t prop = zfs_name_to_prop(propname);
241 nvlist_t *propnv;
242
243 assert(zfs_prop_user(propname) || prop != ZPROP_INVAL);
244
245 if (!zfs_prop_user(propname) && zfs_prop_readonly(prop))
246 continue;
247
248 verify(nvpair_value_nvlist(elem, &propnv) == 0);
249 if (prop == ZFS_PROP_QUOTA || prop == ZFS_PROP_RESERVATION ||
250 prop == ZFS_PROP_REFQUOTA ||
251 prop == ZFS_PROP_REFRESERVATION) {
252 /* these guys are modifyable, but have no source */
253 uint64_t value;
254 verify(nvlist_lookup_uint64(propnv,
255 ZPROP_VALUE, &value) == 0);
256 if (zhp->zfs_type == ZFS_TYPE_SNAPSHOT)
257 continue;
258 } else {
259 char *source;
260 if (nvlist_lookup_string(propnv,
261 ZPROP_SOURCE, &source) != 0)
262 continue;
263 if (strcmp(source, zhp->zfs_name) != 0)
264 continue;
265 }
266
267 if (zfs_prop_user(propname) ||
268 zfs_prop_get_type(prop) == PROP_TYPE_STRING) {
269 char *value;
270 verify(nvlist_lookup_string(propnv,
271 ZPROP_VALUE, &value) == 0);
272 VERIFY(0 == nvlist_add_string(nv, propname, value));
273 } else {
274 uint64_t value;
275 verify(nvlist_lookup_uint64(propnv,
276 ZPROP_VALUE, &value) == 0);
277 VERIFY(0 == nvlist_add_uint64(nv, propname, value));
278 }
279 }
280 }
281
282 /*
283 * recursively generate nvlists describing datasets. See comment
284 * for the data structure send_data_t above for description of contents
285 * of the nvlist.
286 */
287 static int
288 send_iterate_fs(zfs_handle_t *zhp, void *arg)
289 {
290 send_data_t *sd = arg;
291 nvlist_t *nvfs, *nv;
292 int rv;
293 uint64_t parent_fromsnap_guid_save = sd->parent_fromsnap_guid;
294 uint64_t guid = zhp->zfs_dmustats.dds_guid;
295 char guidstring[64];
296
297 VERIFY(0 == nvlist_alloc(&nvfs, NV_UNIQUE_NAME, 0));
298 VERIFY(0 == nvlist_add_string(nvfs, "name", zhp->zfs_name));
299 VERIFY(0 == nvlist_add_uint64(nvfs, "parentfromsnap",
300 sd->parent_fromsnap_guid));
301
302 if (zhp->zfs_dmustats.dds_origin[0]) {
303 zfs_handle_t *origin = zfs_open(zhp->zfs_hdl,
304 zhp->zfs_dmustats.dds_origin, ZFS_TYPE_SNAPSHOT);
305 if (origin == NULL)
306 return (-1);
307 VERIFY(0 == nvlist_add_uint64(nvfs, "origin",
308 origin->zfs_dmustats.dds_guid));
309 }
310
311 /* iterate over props */
312 VERIFY(0 == nvlist_alloc(&nv, NV_UNIQUE_NAME, 0));
313 send_iterate_prop(zhp, nv);
314 VERIFY(0 == nvlist_add_nvlist(nvfs, "props", nv));
315 nvlist_free(nv);
316
317 /* iterate over snaps, and set sd->parent_fromsnap_guid */
318 sd->parent_fromsnap_guid = 0;
319 VERIFY(0 == nvlist_alloc(&sd->parent_snaps, NV_UNIQUE_NAME, 0));
320 VERIFY(0 == nvlist_alloc(&sd->snapprops, NV_UNIQUE_NAME, 0));
321 (void) zfs_iter_snapshots(zhp, send_iterate_snap, sd);
322 VERIFY(0 == nvlist_add_nvlist(nvfs, "snaps", sd->parent_snaps));
323 VERIFY(0 == nvlist_add_nvlist(nvfs, "snapprops", sd->snapprops));
324 nvlist_free(sd->parent_snaps);
325 nvlist_free(sd->snapprops);
326
327 /* add this fs to nvlist */
328 (void) snprintf(guidstring, sizeof (guidstring),
329 "0x%llx", (longlong_t)guid);
330 VERIFY(0 == nvlist_add_nvlist(sd->fss, guidstring, nvfs));
331 nvlist_free(nvfs);
332
333 /* iterate over children */
334 rv = zfs_iter_filesystems(zhp, send_iterate_fs, sd);
335
336 sd->parent_fromsnap_guid = parent_fromsnap_guid_save;
337
338 zfs_close(zhp);
339 return (rv);
340 }
341
342 static int
343 gather_nvlist(libzfs_handle_t *hdl, const char *fsname, const char *fromsnap,
344 const char *tosnap, nvlist_t **nvlp, avl_tree_t **avlp)
345 {
346 zfs_handle_t *zhp;
347 send_data_t sd = { 0 };
348 int error;
349
350 zhp = zfs_open(hdl, fsname, ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME);
351 if (zhp == NULL)
352 return (EZFS_BADTYPE);
353
354 VERIFY(0 == nvlist_alloc(&sd.fss, NV_UNIQUE_NAME, 0));
355 sd.fromsnap = fromsnap;
356 sd.tosnap = tosnap;
357
358 if ((error = send_iterate_fs(zhp, &sd)) != 0) {
359 nvlist_free(sd.fss);
360 if (avlp != NULL)
361 *avlp = NULL;
362 *nvlp = NULL;
363 return (error);
364 }
365
366 if (avlp != NULL && (*avlp = fsavl_create(sd.fss)) == NULL) {
367 nvlist_free(sd.fss);
368 *nvlp = NULL;
369 return (EZFS_NOMEM);
370 }
371
372 *nvlp = sd.fss;
373 return (0);
374 }
375
376 /*
377 * Routines for dealing with the sorted snapshot functionality
378 */
379 typedef struct zfs_node {
380 zfs_handle_t *zn_handle;
381 avl_node_t zn_avlnode;
382 } zfs_node_t;
383
384 static int
385 zfs_sort_snaps(zfs_handle_t *zhp, void *data)
386 {
387 avl_tree_t *avl = data;
388 zfs_node_t *node = zfs_alloc(zhp->zfs_hdl, sizeof (zfs_node_t));
389
390 node->zn_handle = zhp;
391 avl_add(avl, node);
392 return (0);
393 }
394
395 /* ARGSUSED */
396 static int
397 zfs_snapshot_compare(const void *larg, const void *rarg)
398 {
399 zfs_handle_t *l = ((zfs_node_t *)larg)->zn_handle;
400 zfs_handle_t *r = ((zfs_node_t *)rarg)->zn_handle;
401 uint64_t lcreate, rcreate;
402
403 /*
404 * Sort them according to creation time. We use the hidden
405 * CREATETXG property to get an absolute ordering of snapshots.
406 */
407 lcreate = zfs_prop_get_int(l, ZFS_PROP_CREATETXG);
408 rcreate = zfs_prop_get_int(r, ZFS_PROP_CREATETXG);
409
410 if (lcreate < rcreate)
411 return (-1);
412 else if (lcreate > rcreate)
413 return (+1);
414 else
415 return (0);
416 }
417
418 static int
419 zfs_iter_snapshots_sorted(zfs_handle_t *zhp, zfs_iter_f callback, void *data)
420 {
421 int ret = 0;
422 zfs_node_t *node;
423 avl_tree_t avl;
424 void *cookie = NULL;
425
426 avl_create(&avl, zfs_snapshot_compare,
427 sizeof (zfs_node_t), offsetof(zfs_node_t, zn_avlnode));
428
429 ret = zfs_iter_snapshots(zhp, zfs_sort_snaps, &avl);
430
431 for (node = avl_first(&avl); node != NULL; node = AVL_NEXT(&avl, node))
432 ret |= callback(node->zn_handle, data);
433
434 while ((node = avl_destroy_nodes(&avl, &cookie)) != NULL)
435 free(node);
436
437 avl_destroy(&avl);
438
439 return (ret);
440 }
441
442 /*
443 * Routines specific to "zfs send"
444 */
445 typedef struct send_dump_data {
446 /* these are all just the short snapname (the part after the @) */
447 const char *fromsnap;
448 const char *tosnap;
449 char lastsnap[ZFS_MAXNAMELEN];
450 boolean_t seenfrom, seento, replicate, doall, fromorigin;
451 boolean_t verbose;
452 int outfd;
453 boolean_t err;
454 nvlist_t *fss;
455 avl_tree_t *fsavl;
456 } send_dump_data_t;
457
458 /*
459 * Dumps a backup of the given snapshot (incremental from fromsnap if it's not
460 * NULL) to the file descriptor specified by outfd.
461 */
462 static int
463 dump_ioctl(zfs_handle_t *zhp, const char *fromsnap, boolean_t fromorigin,
464 int outfd)
465 {
466 zfs_cmd_t zc = { 0 };
467 libzfs_handle_t *hdl = zhp->zfs_hdl;
468
469 assert(zhp->zfs_type == ZFS_TYPE_SNAPSHOT);
470 assert(fromsnap == NULL || fromsnap[0] == '\0' || !fromorigin);
471
472 (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
473 if (fromsnap)
474 (void) strlcpy(zc.zc_value, fromsnap, sizeof (zc.zc_value));
475 zc.zc_cookie = outfd;
476 zc.zc_obj = fromorigin;
477
478 if (ioctl(zhp->zfs_hdl->libzfs_fd, ZFS_IOC_SEND, &zc) != 0) {
479 char errbuf[1024];
480 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
481 "warning: cannot send '%s'"), zhp->zfs_name);
482
483 switch (errno) {
484
485 case EXDEV:
486 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
487 "not an earlier snapshot from the same fs"));
488 return (zfs_error(hdl, EZFS_CROSSTARGET, errbuf));
489
490 case ENOENT:
491 if (zfs_dataset_exists(hdl, zc.zc_name,
492 ZFS_TYPE_SNAPSHOT)) {
493 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
494 "incremental source (@%s) does not exist"),
495 zc.zc_value);
496 }
497 return (zfs_error(hdl, EZFS_NOENT, errbuf));
498
499 case EDQUOT:
500 case EFBIG:
501 case EIO:
502 case ENOLINK:
503 case ENOSPC:
504 case ENOSTR:
505 case ENXIO:
506 case EPIPE:
507 case ERANGE:
508 case EFAULT:
509 case EROFS:
510 zfs_error_aux(hdl, strerror(errno));
511 return (zfs_error(hdl, EZFS_BADBACKUP, errbuf));
512
513 default:
514 return (zfs_standard_error(hdl, errno, errbuf));
515 }
516 }
517
518 return (0);
519 }
520
521 static int
522 dump_snapshot(zfs_handle_t *zhp, void *arg)
523 {
524 send_dump_data_t *sdd = arg;
525 const char *thissnap;
526 int err;
527
528 thissnap = strchr(zhp->zfs_name, '@') + 1;
529
530 if (sdd->fromsnap && !sdd->seenfrom &&
531 strcmp(sdd->fromsnap, thissnap) == 0) {
532 sdd->seenfrom = B_TRUE;
533 (void) strcpy(sdd->lastsnap, thissnap);
534 zfs_close(zhp);
535 return (0);
536 }
537
538 if (sdd->seento || !sdd->seenfrom) {
539 zfs_close(zhp);
540 return (0);
541 }
542
543 /* send it */
544 if (sdd->verbose) {
545 (void) fprintf(stderr, "sending from @%s to %s\n",
546 sdd->lastsnap, zhp->zfs_name);
547 }
548
549 err = dump_ioctl(zhp, sdd->lastsnap,
550 sdd->lastsnap[0] == '\0' && (sdd->fromorigin || sdd->replicate),
551 sdd->outfd);
552
553 if (!sdd->seento && strcmp(sdd->tosnap, thissnap) == 0)
554 sdd->seento = B_TRUE;
555
556 (void) strcpy(sdd->lastsnap, thissnap);
557 zfs_close(zhp);
558 return (err);
559 }
560
561 static int
562 dump_filesystem(zfs_handle_t *zhp, void *arg)
563 {
564 int rv = 0;
565 send_dump_data_t *sdd = arg;
566 boolean_t missingfrom = B_FALSE;
567 zfs_cmd_t zc = { 0 };
568
569 (void) snprintf(zc.zc_name, sizeof (zc.zc_name), "%s@%s",
570 zhp->zfs_name, sdd->tosnap);
571 if (ioctl(zhp->zfs_hdl->libzfs_fd, ZFS_IOC_OBJSET_STATS, &zc) != 0) {
572 (void) fprintf(stderr, "WARNING: "
573 "could not send %s@%s: does not exist\n",
574 zhp->zfs_name, sdd->tosnap);
575 sdd->err = B_TRUE;
576 return (0);
577 }
578
579 if (sdd->replicate && sdd->fromsnap) {
580 /*
581 * If this fs does not have fromsnap, and we're doing
582 * recursive, we need to send a full stream from the
583 * beginning (or an incremental from the origin if this
584 * is a clone). If we're doing non-recursive, then let
585 * them get the error.
586 */
587 (void) snprintf(zc.zc_name, sizeof (zc.zc_name), "%s@%s",
588 zhp->zfs_name, sdd->fromsnap);
589 if (ioctl(zhp->zfs_hdl->libzfs_fd,
590 ZFS_IOC_OBJSET_STATS, &zc) != 0) {
591 missingfrom = B_TRUE;
592 }
593 }
594
595 if (sdd->doall) {
596 sdd->seenfrom = sdd->seento = sdd->lastsnap[0] = 0;
597 if (sdd->fromsnap == NULL || missingfrom)
598 sdd->seenfrom = B_TRUE;
599
600 rv = zfs_iter_snapshots_sorted(zhp, dump_snapshot, arg);
601 if (!sdd->seenfrom) {
602 (void) fprintf(stderr,
603 "WARNING: could not send %s@%s:\n"
604 "incremental source (%s@%s) does not exist\n",
605 zhp->zfs_name, sdd->tosnap,
606 zhp->zfs_name, sdd->fromsnap);
607 sdd->err = B_TRUE;
608 } else if (!sdd->seento) {
609 if (sdd->fromsnap) {
610 (void) fprintf(stderr,
611 "WARNING: could not send %s@%s:\n"
612 "incremental source (%s@%s) "
613 "is not earlier than it\n",
614 zhp->zfs_name, sdd->tosnap,
615 zhp->zfs_name, sdd->fromsnap);
616 } else {
617 (void) fprintf(stderr, "WARNING: "
618 "could not send %s@%s: does not exist\n",
619 zhp->zfs_name, sdd->tosnap);
620 }
621 sdd->err = B_TRUE;
622 }
623 } else {
624 zfs_handle_t *snapzhp;
625 char snapname[ZFS_MAXNAMELEN];
626
627 (void) snprintf(snapname, sizeof (snapname), "%s@%s",
628 zfs_get_name(zhp), sdd->tosnap);
629 snapzhp = zfs_open(zhp->zfs_hdl, snapname, ZFS_TYPE_SNAPSHOT);
630 if (snapzhp == NULL) {
631 rv = -1;
632 } else {
633 rv = dump_ioctl(snapzhp,
634 missingfrom ? NULL : sdd->fromsnap,
635 sdd->fromorigin || missingfrom,
636 sdd->outfd);
637 sdd->seento = B_TRUE;
638 zfs_close(snapzhp);
639 }
640 }
641
642 return (rv);
643 }
644
645 static int
646 dump_filesystems(zfs_handle_t *rzhp, void *arg)
647 {
648 send_dump_data_t *sdd = arg;
649 nvpair_t *fspair;
650 boolean_t needagain, progress;
651
652 if (!sdd->replicate)
653 return (dump_filesystem(rzhp, sdd));
654
655 again:
656 needagain = progress = B_FALSE;
657 for (fspair = nvlist_next_nvpair(sdd->fss, NULL); fspair;
658 fspair = nvlist_next_nvpair(sdd->fss, fspair)) {
659 nvlist_t *fslist;
660 char *fsname;
661 zfs_handle_t *zhp;
662 int err;
663 uint64_t origin_guid = 0;
664 nvlist_t *origin_nv;
665
666 VERIFY(nvpair_value_nvlist(fspair, &fslist) == 0);
667 if (nvlist_lookup_boolean(fslist, "sent") == 0)
668 continue;
669
670 VERIFY(nvlist_lookup_string(fslist, "name", &fsname) == 0);
671 (void) nvlist_lookup_uint64(fslist, "origin", &origin_guid);
672
673 origin_nv = fsavl_find(sdd->fsavl, origin_guid, NULL);
674 if (origin_nv &&
675 nvlist_lookup_boolean(origin_nv, "sent") == ENOENT) {
676 /*
677 * origin has not been sent yet;
678 * skip this clone.
679 */
680 needagain = B_TRUE;
681 continue;
682 }
683
684 zhp = zfs_open(rzhp->zfs_hdl, fsname, ZFS_TYPE_DATASET);
685 if (zhp == NULL)
686 return (-1);
687 err = dump_filesystem(zhp, sdd);
688 VERIFY(nvlist_add_boolean(fslist, "sent") == 0);
689 progress = B_TRUE;
690 zfs_close(zhp);
691 if (err)
692 return (err);
693 }
694 if (needagain) {
695 assert(progress);
696 goto again;
697 }
698 return (0);
699 }
700
701 /*
702 * Generate a send stream for the dataset identified by the argument zhp.
703 *
704 * The content of the send stream is the snapshot identified by
705 * 'tosnap'. Incremental streams are requested in two ways:
706 * - from the snapshot identified by "fromsnap" (if non-null) or
707 * - from the origin of the dataset identified by zhp, which must
708 * be a clone. In this case, "fromsnap" is null and "fromorigin"
709 * is TRUE.
710 *
711 * The send stream is recursive (i.e. dumps a hierarchy of snapshots) and
712 * uses a special header (with a version field of DMU_BACKUP_HEADER_VERSION)
713 * if "replicate" is set. If "doall" is set, dump all the intermediate
714 * snapshots. The DMU_BACKUP_HEADER_VERSION header is used in the "doall"
715 * case too.
716 */
717 int
718 zfs_send(zfs_handle_t *zhp, const char *fromsnap, const char *tosnap,
719 boolean_t replicate, boolean_t doall, boolean_t fromorigin,
720 boolean_t verbose, int outfd)
721 {
722 char errbuf[1024];
723 send_dump_data_t sdd = { 0 };
724 int err;
725 nvlist_t *fss = NULL;
726 avl_tree_t *fsavl = NULL;
727
728 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
729 "cannot send '%s'"), zhp->zfs_name);
730
731 if (fromsnap && fromsnap[0] == '\0') {
732 zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN,
733 "zero-length incremental source"));
734 return (zfs_error(zhp->zfs_hdl, EZFS_NOENT, errbuf));
735 }
736
737 if (replicate || doall) {
738 dmu_replay_record_t drr = { 0 };
739 char *packbuf = NULL;
740 size_t buflen = 0;
741 zio_cksum_t zc = { 0 };
742
743 assert(fromsnap || doall);
744
745 if (replicate) {
746 nvlist_t *hdrnv;
747
748 VERIFY(0 == nvlist_alloc(&hdrnv, NV_UNIQUE_NAME, 0));
749 if (fromsnap) {
750 VERIFY(0 == nvlist_add_string(hdrnv,
751 "fromsnap", fromsnap));
752 }
753 VERIFY(0 == nvlist_add_string(hdrnv, "tosnap", tosnap));
754
755 err = gather_nvlist(zhp->zfs_hdl, zhp->zfs_name,
756 fromsnap, tosnap, &fss, &fsavl);
757 if (err)
758 return (err);
759 VERIFY(0 == nvlist_add_nvlist(hdrnv, "fss", fss));
760 err = nvlist_pack(hdrnv, &packbuf, &buflen,
761 NV_ENCODE_XDR, 0);
762 nvlist_free(hdrnv);
763 if (err) {
764 fsavl_destroy(fsavl);
765 nvlist_free(fss);
766 return (zfs_standard_error(zhp->zfs_hdl,
767 err, errbuf));
768 }
769 }
770
771 /* write first begin record */
772 drr.drr_type = DRR_BEGIN;
773 drr.drr_u.drr_begin.drr_magic = DMU_BACKUP_MAGIC;
774 drr.drr_u.drr_begin.drr_version = DMU_BACKUP_HEADER_VERSION;
775 (void) snprintf(drr.drr_u.drr_begin.drr_toname,
776 sizeof (drr.drr_u.drr_begin.drr_toname),
777 "%s@%s", zhp->zfs_name, tosnap);
778 drr.drr_payloadlen = buflen;
779 fletcher_4_incremental_native(&drr, sizeof (drr), &zc);
780 err = write(outfd, &drr, sizeof (drr));
781
782 /* write header nvlist */
783 if (err != -1) {
784 fletcher_4_incremental_native(packbuf, buflen, &zc);
785 err = write(outfd, packbuf, buflen);
786 }
787 free(packbuf);
788 if (err == -1) {
789 fsavl_destroy(fsavl);
790 nvlist_free(fss);
791 return (zfs_standard_error(zhp->zfs_hdl,
792 errno, errbuf));
793 }
794
795 /* write end record */
796 if (err != -1) {
797 bzero(&drr, sizeof (drr));
798 drr.drr_type = DRR_END;
799 drr.drr_u.drr_end.drr_checksum = zc;
800 err = write(outfd, &drr, sizeof (drr));
801 if (err == -1) {
802 fsavl_destroy(fsavl);
803 nvlist_free(fss);
804 return (zfs_standard_error(zhp->zfs_hdl,
805 errno, errbuf));
806 }
807 }
808 }
809
810 /* dump each stream */
811 sdd.fromsnap = fromsnap;
812 sdd.tosnap = tosnap;
813 sdd.outfd = outfd;
814 sdd.replicate = replicate;
815 sdd.doall = doall;
816 sdd.fromorigin = fromorigin;
817 sdd.fss = fss;
818 sdd.fsavl = fsavl;
819 sdd.verbose = verbose;
820 err = dump_filesystems(zhp, &sdd);
821 fsavl_destroy(fsavl);
822 nvlist_free(fss);
823
824 if (replicate || doall) {
825 /*
826 * write final end record. NB: want to do this even if
827 * there was some error, because it might not be totally
828 * failed.
829 */
830 dmu_replay_record_t drr = { 0 };
831 drr.drr_type = DRR_END;
832 if (write(outfd, &drr, sizeof (drr)) == -1) {
833 return (zfs_standard_error(zhp->zfs_hdl,
834 errno, errbuf));
835 }
836 }
837
838 return (err || sdd.err);
839 }
840
841 /*
842 * Routines specific to "zfs recv"
843 */
844
845 static int
846 recv_read(libzfs_handle_t *hdl, int fd, void *buf, int ilen,
847 boolean_t byteswap, zio_cksum_t *zc)
848 {
849 char *cp = buf;
850 int rv;
851 int len = ilen;
852
853 do {
854 rv = read(fd, cp, len);
855 cp += rv;
856 len -= rv;
857 } while (rv > 0);
858
859 if (rv < 0 || len != 0) {
860 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
861 "failed to read from stream"));
862 return (zfs_error(hdl, EZFS_BADSTREAM, dgettext(TEXT_DOMAIN,
863 "cannot receive")));
864 }
865
866 if (zc) {
867 if (byteswap)
868 fletcher_4_incremental_byteswap(buf, ilen, zc);
869 else
870 fletcher_4_incremental_native(buf, ilen, zc);
871 }
872 return (0);
873 }
874
875 static int
876 recv_read_nvlist(libzfs_handle_t *hdl, int fd, int len, nvlist_t **nvp,
877 boolean_t byteswap, zio_cksum_t *zc)
878 {
879 char *buf;
880 int err;
881
882 buf = zfs_alloc(hdl, len);
883 if (buf == NULL)
884 return (ENOMEM);
885
886 err = recv_read(hdl, fd, buf, len, byteswap, zc);
887 if (err != 0) {
888 free(buf);
889 return (err);
890 }
891
892 err = nvlist_unpack(buf, len, nvp, 0);
893 free(buf);
894 if (err != 0) {
895 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "invalid "
896 "stream (malformed nvlist)"));
897 return (EINVAL);
898 }
899 return (0);
900 }
901
902 static int
903 recv_rename(libzfs_handle_t *hdl, const char *name, const char *tryname,
904 int baselen, char *newname, recvflags_t flags)
905 {
906 static int seq;
907 zfs_cmd_t zc = { 0 };
908 int err;
909 prop_changelist_t *clp;
910 zfs_handle_t *zhp;
911
912 zhp = zfs_open(hdl, name, ZFS_TYPE_DATASET);
913 if (zhp == NULL)
914 return (-1);
915 clp = changelist_gather(zhp, ZFS_PROP_NAME, 0,
916 flags.force ? MS_FORCE : 0);
917 zfs_close(zhp);
918 if (clp == NULL)
919 return (-1);
920 err = changelist_prefix(clp);
921 if (err)
922 return (err);
923
924 zc.zc_objset_type = DMU_OST_ZFS;
925 (void) strlcpy(zc.zc_name, name, sizeof (zc.zc_name));
926
927 if (tryname) {
928 (void) strcpy(newname, tryname);
929
930 (void) strlcpy(zc.zc_value, tryname, sizeof (zc.zc_value));
931
932 if (flags.verbose) {
933 (void) printf("attempting rename %s to %s\n",
934 zc.zc_name, zc.zc_value);
935 }
936 err = ioctl(hdl->libzfs_fd, ZFS_IOC_RENAME, &zc);
937 if (err == 0)
938 changelist_rename(clp, name, tryname);
939 } else {
940 err = ENOENT;
941 }
942
943 if (err != 0 && strncmp(name+baselen, "recv-", 5) != 0) {
944 seq++;
945
946 (void) strncpy(newname, name, baselen);
947 (void) snprintf(newname+baselen, ZFS_MAXNAMELEN-baselen,
948 "recv-%u-%u", getpid(), seq);
949 (void) strlcpy(zc.zc_value, newname, sizeof (zc.zc_value));
950
951 if (flags.verbose) {
952 (void) printf("failed - trying rename %s to %s\n",
953 zc.zc_name, zc.zc_value);
954 }
955 err = ioctl(hdl->libzfs_fd, ZFS_IOC_RENAME, &zc);
956 if (err == 0)
957 changelist_rename(clp, name, newname);
958 if (err && flags.verbose) {
959 (void) printf("failed (%u) - "
960 "will try again on next pass\n", errno);
961 }
962 err = EAGAIN;
963 } else if (flags.verbose) {
964 if (err == 0)
965 (void) printf("success\n");
966 else
967 (void) printf("failed (%u)\n", errno);
968 }
969
970 (void) changelist_postfix(clp);
971 changelist_free(clp);
972
973 return (err);
974 }
975
976 static int
977 recv_destroy(libzfs_handle_t *hdl, const char *name, int baselen,
978 char *newname, recvflags_t flags)
979 {
980 zfs_cmd_t zc = { 0 };
981 int err = 0;
982 prop_changelist_t *clp;
983 zfs_handle_t *zhp;
984 boolean_t defer = B_FALSE;
985 int spa_version;
986
987 zhp = zfs_open(hdl, name, ZFS_TYPE_DATASET);
988 if (zhp == NULL)
989 return (-1);
990 clp = changelist_gather(zhp, ZFS_PROP_NAME, 0,
991 flags.force ? MS_FORCE : 0);
992 if (zfs_get_type(zhp) == ZFS_TYPE_SNAPSHOT &&
993 zfs_spa_version(zhp, &spa_version) == 0 &&
994 spa_version >= SPA_VERSION_USERREFS)
995 defer = B_TRUE;
996 zfs_close(zhp);
997 if (clp == NULL)
998 return (-1);
999 err = changelist_prefix(clp);
1000 if (err)
1001 return (err);
1002
1003 zc.zc_objset_type = DMU_OST_ZFS;
1004 zc.zc_defer_destroy = defer;
1005 (void) strlcpy(zc.zc_name, name, sizeof (zc.zc_name));
1006
1007 if (flags.verbose)
1008 (void) printf("attempting destroy %s\n", zc.zc_name);
1009 err = ioctl(hdl->libzfs_fd, ZFS_IOC_DESTROY, &zc);
1010 if (err == 0) {
1011 if (flags.verbose)
1012 (void) printf("success\n");
1013 changelist_remove(clp, zc.zc_name);
1014 }
1015
1016 (void) changelist_postfix(clp);
1017 changelist_free(clp);
1018
1019 /*
1020 * Deferred destroy should always succeed. Since we can't tell
1021 * if it destroyed the dataset or just marked it for deferred
1022 * destroy, always do the rename just in case.
1023 */
1024 if (err != 0 || defer)
1025 err = recv_rename(hdl, name, NULL, baselen, newname, flags);
1026
1027 return (err);
1028 }
1029
1030 typedef struct guid_to_name_data {
1031 uint64_t guid;
1032 char *name;
1033 } guid_to_name_data_t;
1034
1035 static int
1036 guid_to_name_cb(zfs_handle_t *zhp, void *arg)
1037 {
1038 guid_to_name_data_t *gtnd = arg;
1039 int err;
1040
1041 if (zhp->zfs_dmustats.dds_guid == gtnd->guid) {
1042 (void) strcpy(gtnd->name, zhp->zfs_name);
1043 return (EEXIST);
1044 }
1045 err = zfs_iter_children(zhp, guid_to_name_cb, gtnd);
1046 zfs_close(zhp);
1047 return (err);
1048 }
1049
1050 static int
1051 guid_to_name(libzfs_handle_t *hdl, const char *parent, uint64_t guid,
1052 char *name)
1053 {
1054 /* exhaustive search all local snapshots */
1055 guid_to_name_data_t gtnd;
1056 int err = 0;
1057 zfs_handle_t *zhp;
1058 char *cp;
1059
1060 gtnd.guid = guid;
1061 gtnd.name = name;
1062
1063 if (strchr(parent, '@') == NULL) {
1064 zhp = make_dataset_handle(hdl, parent);
1065 if (zhp != NULL) {
1066 err = zfs_iter_children(zhp, guid_to_name_cb, &gtnd);
1067 zfs_close(zhp);
1068 if (err == EEXIST)
1069 return (0);
1070 }
1071 }
1072
1073 cp = strchr(parent, '/');
1074 if (cp)
1075 *cp = '\0';
1076 zhp = make_dataset_handle(hdl, parent);
1077 if (cp)
1078 *cp = '/';
1079
1080 if (zhp) {
1081 err = zfs_iter_children(zhp, guid_to_name_cb, &gtnd);
1082 zfs_close(zhp);
1083 }
1084
1085 return (err == EEXIST ? 0 : ENOENT);
1086
1087 }
1088
1089 /*
1090 * Return true if dataset guid1 is created before guid2.
1091 */
1092 static int
1093 created_before(libzfs_handle_t *hdl, avl_tree_t *avl,
1094 uint64_t guid1, uint64_t guid2)
1095 {
1096 nvlist_t *nvfs;
1097 char *fsname, *snapname;
1098 char buf[ZFS_MAXNAMELEN];
1099 int rv;
1100 zfs_node_t zn1, zn2;
1101
1102 if (guid2 == 0)
1103 return (0);
1104 if (guid1 == 0)
1105 return (1);
1106
1107 nvfs = fsavl_find(avl, guid1, &snapname);
1108 VERIFY(0 == nvlist_lookup_string(nvfs, "name", &fsname));
1109 (void) snprintf(buf, sizeof (buf), "%s@%s", fsname, snapname);
1110 zn1.zn_handle = zfs_open(hdl, buf, ZFS_TYPE_SNAPSHOT);
1111 if (zn1.zn_handle == NULL)
1112 return (-1);
1113
1114 nvfs = fsavl_find(avl, guid2, &snapname);
1115 VERIFY(0 == nvlist_lookup_string(nvfs, "name", &fsname));
1116 (void) snprintf(buf, sizeof (buf), "%s@%s", fsname, snapname);
1117 zn2.zn_handle = zfs_open(hdl, buf, ZFS_TYPE_SNAPSHOT);
1118 if (zn2.zn_handle == NULL) {
1119 zfs_close(zn2.zn_handle);
1120 return (-1);
1121 }
1122
1123 rv = (zfs_snapshot_compare(&zn1, &zn2) == -1);
1124
1125 zfs_close(zn1.zn_handle);
1126 zfs_close(zn2.zn_handle);
1127
1128 return (rv);
1129 }
1130
1131 static int
1132 recv_incremental_replication(libzfs_handle_t *hdl, const char *tofs,
1133 recvflags_t flags, nvlist_t *stream_nv, avl_tree_t *stream_avl)
1134 {
1135 nvlist_t *local_nv;
1136 avl_tree_t *local_avl;
1137 nvpair_t *fselem, *nextfselem;
1138 char *tosnap, *fromsnap;
1139 char newname[ZFS_MAXNAMELEN];
1140 int error;
1141 boolean_t needagain, progress;
1142
1143 VERIFY(0 == nvlist_lookup_string(stream_nv, "fromsnap", &fromsnap));
1144 VERIFY(0 == nvlist_lookup_string(stream_nv, "tosnap", &tosnap));
1145
1146 if (flags.dryrun)
1147 return (0);
1148
1149 again:
1150 needagain = progress = B_FALSE;
1151
1152 if ((error = gather_nvlist(hdl, tofs, fromsnap, NULL,
1153 &local_nv, &local_avl)) != 0)
1154 return (error);
1155
1156 /*
1157 * Process deletes and renames
1158 */
1159 for (fselem = nvlist_next_nvpair(local_nv, NULL);
1160 fselem; fselem = nextfselem) {
1161 nvlist_t *nvfs, *snaps;
1162 nvlist_t *stream_nvfs = NULL;
1163 nvpair_t *snapelem, *nextsnapelem;
1164 uint64_t fromguid = 0;
1165 uint64_t originguid = 0;
1166 uint64_t stream_originguid = 0;
1167 uint64_t parent_fromsnap_guid, stream_parent_fromsnap_guid;
1168 char *fsname, *stream_fsname;
1169
1170 nextfselem = nvlist_next_nvpair(local_nv, fselem);
1171
1172 VERIFY(0 == nvpair_value_nvlist(fselem, &nvfs));
1173 VERIFY(0 == nvlist_lookup_nvlist(nvfs, "snaps", &snaps));
1174 VERIFY(0 == nvlist_lookup_string(nvfs, "name", &fsname));
1175 VERIFY(0 == nvlist_lookup_uint64(nvfs, "parentfromsnap",
1176 &parent_fromsnap_guid));
1177 (void) nvlist_lookup_uint64(nvfs, "origin", &originguid);
1178
1179 /*
1180 * First find the stream's fs, so we can check for
1181 * a different origin (due to "zfs promote")
1182 */
1183 for (snapelem = nvlist_next_nvpair(snaps, NULL);
1184 snapelem; snapelem = nvlist_next_nvpair(snaps, snapelem)) {
1185 uint64_t thisguid;
1186
1187 VERIFY(0 == nvpair_value_uint64(snapelem, &thisguid));
1188 stream_nvfs = fsavl_find(stream_avl, thisguid, NULL);
1189
1190 if (stream_nvfs != NULL)
1191 break;
1192 }
1193
1194 /* check for promote */
1195 (void) nvlist_lookup_uint64(stream_nvfs, "origin",
1196 &stream_originguid);
1197 if (stream_nvfs && originguid != stream_originguid) {
1198 switch (created_before(hdl, local_avl,
1199 stream_originguid, originguid)) {
1200 case 1: {
1201 /* promote it! */
1202 zfs_cmd_t zc = { 0 };
1203 nvlist_t *origin_nvfs;
1204 char *origin_fsname;
1205
1206 if (flags.verbose)
1207 (void) printf("promoting %s\n", fsname);
1208
1209 origin_nvfs = fsavl_find(local_avl, originguid,
1210 NULL);
1211 VERIFY(0 == nvlist_lookup_string(origin_nvfs,
1212 "name", &origin_fsname));
1213 (void) strlcpy(zc.zc_value, origin_fsname,
1214 sizeof (zc.zc_value));
1215 (void) strlcpy(zc.zc_name, fsname,
1216 sizeof (zc.zc_name));
1217 error = zfs_ioctl(hdl, ZFS_IOC_PROMOTE, &zc);
1218 if (error == 0)
1219 progress = B_TRUE;
1220 break;
1221 }
1222 default:
1223 break;
1224 case -1:
1225 fsavl_destroy(local_avl);
1226 nvlist_free(local_nv);
1227 return (-1);
1228 }
1229 /*
1230 * We had/have the wrong origin, therefore our
1231 * list of snapshots is wrong. Need to handle
1232 * them on the next pass.
1233 */
1234 needagain = B_TRUE;
1235 continue;
1236 }
1237
1238 for (snapelem = nvlist_next_nvpair(snaps, NULL);
1239 snapelem; snapelem = nextsnapelem) {
1240 uint64_t thisguid;
1241 char *stream_snapname;
1242 nvlist_t *found, *props;
1243
1244 nextsnapelem = nvlist_next_nvpair(snaps, snapelem);
1245
1246 VERIFY(0 == nvpair_value_uint64(snapelem, &thisguid));
1247 found = fsavl_find(stream_avl, thisguid,
1248 &stream_snapname);
1249
1250 /* check for delete */
1251 if (found == NULL) {
1252 char name[ZFS_MAXNAMELEN];
1253
1254 if (!flags.force)
1255 continue;
1256
1257 (void) snprintf(name, sizeof (name), "%s@%s",
1258 fsname, nvpair_name(snapelem));
1259
1260 error = recv_destroy(hdl, name,
1261 strlen(fsname)+1, newname, flags);
1262 if (error)
1263 needagain = B_TRUE;
1264 else
1265 progress = B_TRUE;
1266 continue;
1267 }
1268
1269 stream_nvfs = found;
1270
1271 if (0 == nvlist_lookup_nvlist(stream_nvfs, "snapprops",
1272 &props) && 0 == nvlist_lookup_nvlist(props,
1273 stream_snapname, &props)) {
1274 zfs_cmd_t zc = { 0 };
1275
1276 zc.zc_cookie = B_TRUE; /* clear current props */
1277 (void) snprintf(zc.zc_name, sizeof (zc.zc_name),
1278 "%s@%s", fsname, nvpair_name(snapelem));
1279 if (zcmd_write_src_nvlist(hdl, &zc,
1280 props) == 0) {
1281 (void) zfs_ioctl(hdl,
1282 ZFS_IOC_SET_PROP, &zc);
1283 zcmd_free_nvlists(&zc);
1284 }
1285 }
1286
1287 /* check for different snapname */
1288 if (strcmp(nvpair_name(snapelem),
1289 stream_snapname) != 0) {
1290 char name[ZFS_MAXNAMELEN];
1291 char tryname[ZFS_MAXNAMELEN];
1292
1293 (void) snprintf(name, sizeof (name), "%s@%s",
1294 fsname, nvpair_name(snapelem));
1295 (void) snprintf(tryname, sizeof (name), "%s@%s",
1296 fsname, stream_snapname);
1297
1298 error = recv_rename(hdl, name, tryname,
1299 strlen(fsname)+1, newname, flags);
1300 if (error)
1301 needagain = B_TRUE;
1302 else
1303 progress = B_TRUE;
1304 }
1305
1306 if (strcmp(stream_snapname, fromsnap) == 0)
1307 fromguid = thisguid;
1308 }
1309
1310 /* check for delete */
1311 if (stream_nvfs == NULL) {
1312 if (!flags.force)
1313 continue;
1314
1315 error = recv_destroy(hdl, fsname, strlen(tofs)+1,
1316 newname, flags);
1317 if (error)
1318 needagain = B_TRUE;
1319 else
1320 progress = B_TRUE;
1321 continue;
1322 }
1323
1324 if (fromguid == 0 && flags.verbose) {
1325 (void) printf("local fs %s does not have fromsnap "
1326 "(%s in stream); must have been deleted locally; "
1327 "ignoring\n", fsname, fromsnap);
1328 continue;
1329 }
1330
1331 VERIFY(0 == nvlist_lookup_string(stream_nvfs,
1332 "name", &stream_fsname));
1333 VERIFY(0 == nvlist_lookup_uint64(stream_nvfs,
1334 "parentfromsnap", &stream_parent_fromsnap_guid));
1335
1336 /* check for rename */
1337 if ((stream_parent_fromsnap_guid != 0 &&
1338 stream_parent_fromsnap_guid != parent_fromsnap_guid) ||
1339 strcmp(strrchr(fsname, '/'),
1340 strrchr(stream_fsname, '/')) != 0) {
1341 nvlist_t *parent;
1342 char tryname[ZFS_MAXNAMELEN];
1343
1344 parent = fsavl_find(local_avl,
1345 stream_parent_fromsnap_guid, NULL);
1346 /*
1347 * NB: parent might not be found if we used the
1348 * tosnap for stream_parent_fromsnap_guid,
1349 * because the parent is a newly-created fs;
1350 * we'll be able to rename it after we recv the
1351 * new fs.
1352 */
1353 if (parent != NULL) {
1354 char *pname;
1355
1356 VERIFY(0 == nvlist_lookup_string(parent, "name",
1357 &pname));
1358 (void) snprintf(tryname, sizeof (tryname),
1359 "%s%s", pname, strrchr(stream_fsname, '/'));
1360 } else {
1361 tryname[0] = '\0';
1362 if (flags.verbose) {
1363 (void) printf("local fs %s new parent "
1364 "not found\n", fsname);
1365 }
1366 }
1367
1368 error = recv_rename(hdl, fsname, tryname,
1369 strlen(tofs)+1, newname, flags);
1370 if (error)
1371 needagain = B_TRUE;
1372 else
1373 progress = B_TRUE;
1374 }
1375 }
1376
1377 fsavl_destroy(local_avl);
1378 nvlist_free(local_nv);
1379
1380 if (needagain && progress) {
1381 /* do another pass to fix up temporary names */
1382 if (flags.verbose)
1383 (void) printf("another pass:\n");
1384 goto again;
1385 }
1386
1387 return (needagain);
1388 }
1389
1390 static int
1391 zfs_receive_package(libzfs_handle_t *hdl, int fd, const char *destname,
1392 recvflags_t flags, dmu_replay_record_t *drr, zio_cksum_t *zc,
1393 char **top_zfs)
1394 {
1395 nvlist_t *stream_nv = NULL;
1396 avl_tree_t *stream_avl = NULL;
1397 char *fromsnap = NULL;
1398 char tofs[ZFS_MAXNAMELEN];
1399 char errbuf[1024];
1400 dmu_replay_record_t drre;
1401 int error;
1402 boolean_t anyerr = B_FALSE;
1403 boolean_t softerr = B_FALSE;
1404
1405 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
1406 "cannot receive"));
1407
1408 if (strchr(destname, '@')) {
1409 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1410 "can not specify snapshot name for multi-snapshot stream"));
1411 return (zfs_error(hdl, EZFS_BADSTREAM, errbuf));
1412 }
1413
1414 assert(drr->drr_type == DRR_BEGIN);
1415 assert(drr->drr_u.drr_begin.drr_magic == DMU_BACKUP_MAGIC);
1416 assert(drr->drr_u.drr_begin.drr_version == DMU_BACKUP_HEADER_VERSION);
1417
1418 /*
1419 * Read in the nvlist from the stream.
1420 */
1421 if (drr->drr_payloadlen != 0) {
1422 if (!flags.isprefix) {
1423 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1424 "must use -d to receive replication "
1425 "(send -R) stream"));
1426 return (zfs_error(hdl, EZFS_BADSTREAM, errbuf));
1427 }
1428
1429 error = recv_read_nvlist(hdl, fd, drr->drr_payloadlen,
1430 &stream_nv, flags.byteswap, zc);
1431 if (error) {
1432 error = zfs_error(hdl, EZFS_BADSTREAM, errbuf);
1433 goto out;
1434 }
1435 }
1436
1437 /*
1438 * Read in the end record and verify checksum.
1439 */
1440 if (0 != (error = recv_read(hdl, fd, &drre, sizeof (drre),
1441 flags.byteswap, NULL)))
1442 goto out;
1443 if (flags.byteswap) {
1444 drre.drr_type = BSWAP_32(drre.drr_type);
1445 drre.drr_u.drr_end.drr_checksum.zc_word[0] =
1446 BSWAP_64(drre.drr_u.drr_end.drr_checksum.zc_word[0]);
1447 drre.drr_u.drr_end.drr_checksum.zc_word[1] =
1448 BSWAP_64(drre.drr_u.drr_end.drr_checksum.zc_word[1]);
1449 drre.drr_u.drr_end.drr_checksum.zc_word[2] =
1450 BSWAP_64(drre.drr_u.drr_end.drr_checksum.zc_word[2]);
1451 drre.drr_u.drr_end.drr_checksum.zc_word[3] =
1452 BSWAP_64(drre.drr_u.drr_end.drr_checksum.zc_word[3]);
1453 }
1454 if (drre.drr_type != DRR_END) {
1455 error = zfs_error(hdl, EZFS_BADSTREAM, errbuf);
1456 goto out;
1457 }
1458 if (!ZIO_CHECKSUM_EQUAL(drre.drr_u.drr_end.drr_checksum, *zc)) {
1459 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1460 "incorrect header checksum"));
1461 error = zfs_error(hdl, EZFS_BADSTREAM, errbuf);
1462 goto out;
1463 }
1464
1465 (void) nvlist_lookup_string(stream_nv, "fromsnap", &fromsnap);
1466
1467 if (drr->drr_payloadlen != 0) {
1468 nvlist_t *stream_fss;
1469
1470 VERIFY(0 == nvlist_lookup_nvlist(stream_nv, "fss",
1471 &stream_fss));
1472 if ((stream_avl = fsavl_create(stream_fss)) == NULL) {
1473 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1474 "couldn't allocate avl tree"));
1475 error = zfs_error(hdl, EZFS_NOMEM, errbuf);
1476 goto out;
1477 }
1478
1479 if (fromsnap != NULL) {
1480 (void) strlcpy(tofs, destname, ZFS_MAXNAMELEN);
1481 if (flags.isprefix) {
1482 int i = strcspn(drr->drr_u.drr_begin.drr_toname,
1483 "/@");
1484 /* zfs_receive_one() will create_parents() */
1485 (void) strlcat(tofs,
1486 &drr->drr_u.drr_begin.drr_toname[i],
1487 ZFS_MAXNAMELEN);
1488 *strchr(tofs, '@') = '\0';
1489 }
1490 softerr = recv_incremental_replication(hdl, tofs,
1491 flags, stream_nv, stream_avl);
1492 }
1493 }
1494
1495
1496 /* Finally, receive each contained stream */
1497 do {
1498 /*
1499 * we should figure out if it has a recoverable
1500 * error, in which case do a recv_skip() and drive on.
1501 * Note, if we fail due to already having this guid,
1502 * zfs_receive_one() will take care of it (ie,
1503 * recv_skip() and return 0).
1504 */
1505 error = zfs_receive_impl(hdl, destname, flags, fd,
1506 stream_avl, top_zfs);
1507 if (error == ENODATA) {
1508 error = 0;
1509 break;
1510 }
1511 anyerr |= error;
1512 } while (error == 0);
1513
1514 if (drr->drr_payloadlen != 0 && fromsnap != NULL) {
1515 /*
1516 * Now that we have the fs's they sent us, try the
1517 * renames again.
1518 */
1519 softerr = recv_incremental_replication(hdl, tofs, flags,
1520 stream_nv, stream_avl);
1521 }
1522
1523 out:
1524 fsavl_destroy(stream_avl);
1525 if (stream_nv)
1526 nvlist_free(stream_nv);
1527 if (softerr)
1528 error = -2;
1529 if (anyerr)
1530 error = -1;
1531 return (error);
1532 }
1533
1534 static int
1535 recv_skip(libzfs_handle_t *hdl, int fd, boolean_t byteswap)
1536 {
1537 dmu_replay_record_t *drr;
1538 void *buf = malloc(1<<20);
1539
1540 /* XXX would be great to use lseek if possible... */
1541 drr = buf;
1542
1543 while (recv_read(hdl, fd, drr, sizeof (dmu_replay_record_t),
1544 byteswap, NULL) == 0) {
1545 if (byteswap)
1546 drr->drr_type = BSWAP_32(drr->drr_type);
1547
1548 switch (drr->drr_type) {
1549 case DRR_BEGIN:
1550 /* NB: not to be used on v2 stream packages */
1551 assert(drr->drr_payloadlen == 0);
1552 break;
1553
1554 case DRR_END:
1555 free(buf);
1556 return (0);
1557
1558 case DRR_OBJECT:
1559 if (byteswap) {
1560 drr->drr_u.drr_object.drr_bonuslen =
1561 BSWAP_32(drr->drr_u.drr_object.
1562 drr_bonuslen);
1563 }
1564 (void) recv_read(hdl, fd, buf,
1565 P2ROUNDUP(drr->drr_u.drr_object.drr_bonuslen, 8),
1566 B_FALSE, NULL);
1567 break;
1568
1569 case DRR_WRITE:
1570 if (byteswap) {
1571 drr->drr_u.drr_write.drr_length =
1572 BSWAP_64(drr->drr_u.drr_write.drr_length);
1573 }
1574 (void) recv_read(hdl, fd, buf,
1575 drr->drr_u.drr_write.drr_length, B_FALSE, NULL);
1576 break;
1577
1578 case DRR_FREEOBJECTS:
1579 case DRR_FREE:
1580 break;
1581
1582 default:
1583 assert(!"invalid record type");
1584 }
1585 }
1586
1587 free(buf);
1588 return (-1);
1589 }
1590
1591 /*
1592 * Restores a backup of tosnap from the file descriptor specified by infd.
1593 */
1594 static int
1595 zfs_receive_one(libzfs_handle_t *hdl, int infd, const char *tosnap,
1596 recvflags_t flags, dmu_replay_record_t *drr,
1597 dmu_replay_record_t *drr_noswap, avl_tree_t *stream_avl,
1598 char **top_zfs)
1599 {
1600 zfs_cmd_t zc = { 0 };
1601 time_t begin_time;
1602 int ioctl_err, ioctl_errno, err, choplen;
1603 char *cp;
1604 struct drr_begin *drrb = &drr->drr_u.drr_begin;
1605 char errbuf[1024];
1606 char chopprefix[ZFS_MAXNAMELEN];
1607 boolean_t newfs = B_FALSE;
1608 boolean_t stream_wantsnewfs;
1609 uint64_t parent_snapguid = 0;
1610 prop_changelist_t *clp = NULL;
1611 nvlist_t *snapprops_nvlist = NULL;
1612
1613 begin_time = time(NULL);
1614
1615 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
1616 "cannot receive"));
1617
1618 if (stream_avl != NULL) {
1619 char *snapname;
1620 nvlist_t *fs = fsavl_find(stream_avl, drrb->drr_toguid,
1621 &snapname);
1622 nvlist_t *props;
1623 int ret;
1624
1625 (void) nvlist_lookup_uint64(fs, "parentfromsnap",
1626 &parent_snapguid);
1627 err = nvlist_lookup_nvlist(fs, "props", &props);
1628 if (err)
1629 VERIFY(0 == nvlist_alloc(&props, NV_UNIQUE_NAME, 0));
1630
1631 if (flags.canmountoff) {
1632 VERIFY(0 == nvlist_add_uint64(props,
1633 zfs_prop_to_name(ZFS_PROP_CANMOUNT), 0));
1634 }
1635 ret = zcmd_write_src_nvlist(hdl, &zc, props);
1636 if (err)
1637 nvlist_free(props);
1638
1639 if (0 == nvlist_lookup_nvlist(fs, "snapprops", &props)) {
1640 VERIFY(0 == nvlist_lookup_nvlist(props,
1641 snapname, &snapprops_nvlist));
1642 }
1643
1644 if (ret != 0)
1645 return (-1);
1646 }
1647
1648 /*
1649 * Determine how much of the snapshot name stored in the stream
1650 * we are going to tack on to the name they specified on the
1651 * command line, and how much we are going to chop off.
1652 *
1653 * If they specified a snapshot, chop the entire name stored in
1654 * the stream.
1655 */
1656 (void) strcpy(chopprefix, drrb->drr_toname);
1657 if (flags.isprefix) {
1658 /*
1659 * They specified a fs with -d, we want to tack on
1660 * everything but the pool name stored in the stream
1661 */
1662 if (strchr(tosnap, '@')) {
1663 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "invalid "
1664 "argument - snapshot not allowed with -d"));
1665 return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf));
1666 }
1667 cp = strchr(chopprefix, '/');
1668 if (cp == NULL)
1669 cp = strchr(chopprefix, '@');
1670 *cp = '\0';
1671 } else if (strchr(tosnap, '@') == NULL) {
1672 /*
1673 * If they specified a filesystem without -d, we want to
1674 * tack on everything after the fs specified in the
1675 * first name from the stream.
1676 */
1677 cp = strchr(chopprefix, '@');
1678 *cp = '\0';
1679 }
1680 choplen = strlen(chopprefix);
1681
1682 /*
1683 * Determine name of destination snapshot, store in zc_value.
1684 */
1685 (void) strcpy(zc.zc_value, tosnap);
1686 (void) strncat(zc.zc_value, drrb->drr_toname+choplen,
1687 sizeof (zc.zc_value));
1688 if (!zfs_name_valid(zc.zc_value, ZFS_TYPE_SNAPSHOT)) {
1689 zcmd_free_nvlists(&zc);
1690 return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf));
1691 }
1692
1693 /*
1694 * Determine the name of the origin snapshot, store in zc_string.
1695 */
1696 if (drrb->drr_flags & DRR_FLAG_CLONE) {
1697 if (guid_to_name(hdl, tosnap,
1698 drrb->drr_fromguid, zc.zc_string) != 0) {
1699 zcmd_free_nvlists(&zc);
1700 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1701 "local origin for clone %s does not exist"),
1702 zc.zc_value);
1703 return (zfs_error(hdl, EZFS_NOENT, errbuf));
1704 }
1705 if (flags.verbose)
1706 (void) printf("found clone origin %s\n", zc.zc_string);
1707 }
1708
1709 stream_wantsnewfs = (drrb->drr_fromguid == NULL ||
1710 (drrb->drr_flags & DRR_FLAG_CLONE));
1711
1712 if (stream_wantsnewfs) {
1713 /*
1714 * if the parent fs does not exist, look for it based on
1715 * the parent snap GUID
1716 */
1717 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
1718 "cannot receive new filesystem stream"));
1719
1720 (void) strcpy(zc.zc_name, zc.zc_value);
1721 cp = strrchr(zc.zc_name, '/');
1722 if (cp)
1723 *cp = '\0';
1724 if (cp &&
1725 !zfs_dataset_exists(hdl, zc.zc_name, ZFS_TYPE_DATASET)) {
1726 char suffix[ZFS_MAXNAMELEN];
1727 (void) strcpy(suffix, strrchr(zc.zc_value, '/'));
1728 if (guid_to_name(hdl, tosnap, parent_snapguid,
1729 zc.zc_value) == 0) {
1730 *strchr(zc.zc_value, '@') = '\0';
1731 (void) strcat(zc.zc_value, suffix);
1732 }
1733 }
1734 } else {
1735 /*
1736 * if the fs does not exist, look for it based on the
1737 * fromsnap GUID
1738 */
1739 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
1740 "cannot receive incremental stream"));
1741
1742 (void) strcpy(zc.zc_name, zc.zc_value);
1743 *strchr(zc.zc_name, '@') = '\0';
1744
1745 if (!zfs_dataset_exists(hdl, zc.zc_name, ZFS_TYPE_DATASET)) {
1746 char snap[ZFS_MAXNAMELEN];
1747 (void) strcpy(snap, strchr(zc.zc_value, '@'));
1748 if (guid_to_name(hdl, tosnap, drrb->drr_fromguid,
1749 zc.zc_value) == 0) {
1750 *strchr(zc.zc_value, '@') = '\0';
1751 (void) strcat(zc.zc_value, snap);
1752 }
1753 }
1754 }
1755
1756 (void) strcpy(zc.zc_name, zc.zc_value);
1757 *strchr(zc.zc_name, '@') = '\0';
1758
1759 if (zfs_dataset_exists(hdl, zc.zc_name, ZFS_TYPE_DATASET)) {
1760 zfs_handle_t *zhp;
1761 /*
1762 * Destination fs exists. Therefore this should either
1763 * be an incremental, or the stream specifies a new fs
1764 * (full stream or clone) and they want us to blow it
1765 * away (and have therefore specified -F and removed any
1766 * snapshots).
1767 */
1768
1769 if (stream_wantsnewfs) {
1770 if (!flags.force) {
1771 zcmd_free_nvlists(&zc);
1772 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1773 "destination '%s' exists\n"
1774 "must specify -F to overwrite it"),
1775 zc.zc_name);
1776 return (zfs_error(hdl, EZFS_EXISTS, errbuf));
1777 }
1778 if (ioctl(hdl->libzfs_fd, ZFS_IOC_SNAPSHOT_LIST_NEXT,
1779 &zc) == 0) {
1780 zcmd_free_nvlists(&zc);
1781 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1782 "destination has snapshots (eg. %s)\n"
1783 "must destroy them to overwrite it"),
1784 zc.zc_name);
1785 return (zfs_error(hdl, EZFS_EXISTS, errbuf));
1786 }
1787 }
1788
1789 if ((zhp = zfs_open(hdl, zc.zc_name,
1790 ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME)) == NULL) {
1791 zcmd_free_nvlists(&zc);
1792 return (-1);
1793 }
1794
1795 if (stream_wantsnewfs &&
1796 zhp->zfs_dmustats.dds_origin[0]) {
1797 zcmd_free_nvlists(&zc);
1798 zfs_close(zhp);
1799 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1800 "destination '%s' is a clone\n"
1801 "must destroy it to overwrite it"),
1802 zc.zc_name);
1803 return (zfs_error(hdl, EZFS_EXISTS, errbuf));
1804 }
1805
1806 if (!flags.dryrun && zhp->zfs_type == ZFS_TYPE_FILESYSTEM &&
1807 stream_wantsnewfs) {
1808 /* We can't do online recv in this case */
1809 clp = changelist_gather(zhp, ZFS_PROP_NAME, 0, 0);
1810 if (clp == NULL) {
1811 zfs_close(zhp);
1812 zcmd_free_nvlists(&zc);
1813 return (-1);
1814 }
1815 if (changelist_prefix(clp) != 0) {
1816 changelist_free(clp);
1817 zfs_close(zhp);
1818 zcmd_free_nvlists(&zc);
1819 return (-1);
1820 }
1821 }
1822 if (!flags.dryrun && zhp->zfs_type == ZFS_TYPE_VOLUME &&
1823 zvol_remove_link(hdl, zhp->zfs_name) != 0) {
1824 zfs_close(zhp);
1825 zcmd_free_nvlists(&zc);
1826 return (-1);
1827 }
1828 zfs_close(zhp);
1829 } else {
1830 /*
1831 * Destination filesystem does not exist. Therefore we better
1832 * be creating a new filesystem (either from a full backup, or
1833 * a clone). It would therefore be invalid if the user
1834 * specified only the pool name (i.e. if the destination name
1835 * contained no slash character).
1836 */
1837 if (!stream_wantsnewfs ||
1838 (cp = strrchr(zc.zc_name, '/')) == NULL) {
1839 zcmd_free_nvlists(&zc);
1840 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1841 "destination '%s' does not exist"), zc.zc_name);
1842 return (zfs_error(hdl, EZFS_NOENT, errbuf));
1843 }
1844
1845 /*
1846 * Trim off the final dataset component so we perform the
1847 * recvbackup ioctl to the filesystems's parent.
1848 */
1849 *cp = '\0';
1850
1851 if (flags.isprefix && !flags.dryrun &&
1852 create_parents(hdl, zc.zc_value, strlen(tosnap)) != 0) {
1853 zcmd_free_nvlists(&zc);
1854 return (zfs_error(hdl, EZFS_BADRESTORE, errbuf));
1855 }
1856
1857 newfs = B_TRUE;
1858 }
1859
1860 zc.zc_begin_record = drr_noswap->drr_u.drr_begin;
1861 zc.zc_cookie = infd;
1862 zc.zc_guid = flags.force;
1863 if (flags.verbose) {
1864 (void) printf("%s %s stream of %s into %s\n",
1865 flags.dryrun ? "would receive" : "receiving",
1866 drrb->drr_fromguid ? "incremental" : "full",
1867 drrb->drr_toname, zc.zc_value);
1868 (void) fflush(stdout);
1869 }
1870
1871 if (flags.dryrun) {
1872 zcmd_free_nvlists(&zc);
1873 return (recv_skip(hdl, infd, flags.byteswap));
1874 }
1875
1876 err = ioctl_err = zfs_ioctl(hdl, ZFS_IOC_RECV, &zc);
1877 ioctl_errno = errno;
1878 zcmd_free_nvlists(&zc);
1879
1880 if (err == 0 && snapprops_nvlist) {
1881 zfs_cmd_t zc2 = { 0 };
1882
1883 (void) strcpy(zc2.zc_name, zc.zc_value);
1884 if (zcmd_write_src_nvlist(hdl, &zc2, snapprops_nvlist) == 0) {
1885 (void) zfs_ioctl(hdl, ZFS_IOC_SET_PROP, &zc2);
1886 zcmd_free_nvlists(&zc2);
1887 }
1888 }
1889
1890 if (err && (ioctl_errno == ENOENT || ioctl_errno == ENODEV)) {
1891 /*
1892 * It may be that this snapshot already exists,
1893 * in which case we want to consume & ignore it
1894 * rather than failing.
1895 */
1896 avl_tree_t *local_avl;
1897 nvlist_t *local_nv, *fs;
1898 char *cp = strchr(zc.zc_value, '@');
1899
1900 /*
1901 * XXX Do this faster by just iterating over snaps in
1902 * this fs. Also if zc_value does not exist, we will
1903 * get a strange "does not exist" error message.
1904 */
1905 *cp = '\0';
1906 if (gather_nvlist(hdl, zc.zc_value, NULL, NULL,
1907 &local_nv, &local_avl) == 0) {
1908 *cp = '@';
1909 fs = fsavl_find(local_avl, drrb->drr_toguid, NULL);
1910 fsavl_destroy(local_avl);
1911 nvlist_free(local_nv);
1912
1913 if (fs != NULL) {
1914 if (flags.verbose) {
1915 (void) printf("snap %s already exists; "
1916 "ignoring\n", zc.zc_value);
1917 }
1918 ioctl_err = recv_skip(hdl, infd,
1919 flags.byteswap);
1920 }
1921 }
1922 *cp = '@';
1923 }
1924
1925
1926 if (ioctl_err != 0) {
1927 switch (ioctl_errno) {
1928 case ENODEV:
1929 cp = strchr(zc.zc_value, '@');
1930 *cp = '\0';
1931 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1932 "most recent snapshot of %s does not\n"
1933 "match incremental source"), zc.zc_value);
1934 (void) zfs_error(hdl, EZFS_BADRESTORE, errbuf);
1935 *cp = '@';
1936 break;
1937 case ETXTBSY:
1938 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1939 "destination %s has been modified\n"
1940 "since most recent snapshot"), zc.zc_name);
1941 (void) zfs_error(hdl, EZFS_BADRESTORE, errbuf);
1942 break;
1943 case EEXIST:
1944 cp = strchr(zc.zc_value, '@');
1945 if (newfs) {
1946 /* it's the containing fs that exists */
1947 *cp = '\0';
1948 }
1949 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1950 "destination already exists"));
1951 (void) zfs_error_fmt(hdl, EZFS_EXISTS,
1952 dgettext(TEXT_DOMAIN, "cannot restore to %s"),
1953 zc.zc_value);
1954 *cp = '@';
1955 break;
1956 case EINVAL:
1957 (void) zfs_error(hdl, EZFS_BADSTREAM, errbuf);
1958 break;
1959 case ECKSUM:
1960 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1961 "invalid stream (checksum mismatch)"));
1962 (void) zfs_error(hdl, EZFS_BADSTREAM, errbuf);
1963 break;
1964 default:
1965 (void) zfs_standard_error(hdl, ioctl_errno, errbuf);
1966 }
1967 }
1968
1969 /*
1970 * Mount or recreate the /dev links for the target filesystem
1971 * (if created, or if we tore them down to do an incremental
1972 * restore), and the /dev links for the new snapshot (if
1973 * created). Also mount any children of the target filesystem
1974 * if we did a replication receive (indicated by stream_avl
1975 * being non-NULL).
1976 */
1977 cp = strchr(zc.zc_value, '@');
1978 if (cp && (ioctl_err == 0 || !newfs)) {
1979 zfs_handle_t *h;
1980
1981 *cp = '\0';
1982 h = zfs_open(hdl, zc.zc_value,
1983 ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME);
1984 if (h != NULL) {
1985 if (h->zfs_type == ZFS_TYPE_VOLUME) {
1986 *cp = '@';
1987 err = zvol_create_link(hdl, h->zfs_name);
1988 if (err == 0 && ioctl_err == 0)
1989 err = zvol_create_link(hdl,
1990 zc.zc_value);
1991 } else if (newfs || stream_avl) {
1992 /*
1993 * Track the first/top of hierarchy fs,
1994 * for mounting and sharing later.
1995 */
1996 if (top_zfs && *top_zfs == NULL)
1997 *top_zfs = zfs_strdup(hdl, zc.zc_value);
1998 }
1999 zfs_close(h);
2000 }
2001 *cp = '@';
2002 }
2003
2004 if (clp) {
2005 err |= changelist_postfix(clp);
2006 changelist_free(clp);
2007 }
2008
2009 if (err || ioctl_err)
2010 return (-1);
2011
2012 if (flags.verbose) {
2013 char buf1[64];
2014 char buf2[64];
2015 uint64_t bytes = zc.zc_cookie;
2016 time_t delta = time(NULL) - begin_time;
2017 if (delta == 0)
2018 delta = 1;
2019 zfs_nicenum(bytes, buf1, sizeof (buf1));
2020 zfs_nicenum(bytes/delta, buf2, sizeof (buf1));
2021
2022 (void) printf("received %sB stream in %lu seconds (%sB/sec)\n",
2023 buf1, delta, buf2);
2024 }
2025
2026 return (0);
2027 }
2028
2029 static int
2030 zfs_receive_impl(libzfs_handle_t *hdl, const char *tosnap, recvflags_t flags,
2031 int infd, avl_tree_t *stream_avl, char **top_zfs)
2032 {
2033 int err;
2034 dmu_replay_record_t drr, drr_noswap;
2035 struct drr_begin *drrb = &drr.drr_u.drr_begin;
2036 char errbuf[1024];
2037 zio_cksum_t zcksum = { 0 };
2038
2039 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
2040 "cannot receive"));
2041
2042 if (flags.isprefix &&
2043 !zfs_dataset_exists(hdl, tosnap, ZFS_TYPE_DATASET)) {
2044 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "specified fs "
2045 "(%s) does not exist"), tosnap);
2046 return (zfs_error(hdl, EZFS_NOENT, errbuf));
2047 }
2048
2049 /* read in the BEGIN record */
2050 if (0 != (err = recv_read(hdl, infd, &drr, sizeof (drr), B_FALSE,
2051 &zcksum)))
2052 return (err);
2053
2054 if (drr.drr_type == DRR_END || drr.drr_type == BSWAP_32(DRR_END)) {
2055 /* It's the double end record at the end of a package */
2056 return (ENODATA);
2057 }
2058
2059 /* the kernel needs the non-byteswapped begin record */
2060 drr_noswap = drr;
2061
2062 flags.byteswap = B_FALSE;
2063 if (drrb->drr_magic == BSWAP_64(DMU_BACKUP_MAGIC)) {
2064 /*
2065 * We computed the checksum in the wrong byteorder in
2066 * recv_read() above; do it again correctly.
2067 */
2068 bzero(&zcksum, sizeof (zio_cksum_t));
2069 fletcher_4_incremental_byteswap(&drr, sizeof (drr), &zcksum);
2070 flags.byteswap = B_TRUE;
2071
2072 drr.drr_type = BSWAP_32(drr.drr_type);
2073 drr.drr_payloadlen = BSWAP_32(drr.drr_payloadlen);
2074 drrb->drr_magic = BSWAP_64(drrb->drr_magic);
2075 drrb->drr_version = BSWAP_64(drrb->drr_version);
2076 drrb->drr_creation_time = BSWAP_64(drrb->drr_creation_time);
2077 drrb->drr_type = BSWAP_32(drrb->drr_type);
2078 drrb->drr_flags = BSWAP_32(drrb->drr_flags);
2079 drrb->drr_toguid = BSWAP_64(drrb->drr_toguid);
2080 drrb->drr_fromguid = BSWAP_64(drrb->drr_fromguid);
2081 }
2082
2083 if (drrb->drr_magic != DMU_BACKUP_MAGIC || drr.drr_type != DRR_BEGIN) {
2084 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "invalid "
2085 "stream (bad magic number)"));
2086 return (zfs_error(hdl, EZFS_BADSTREAM, errbuf));
2087 }
2088
2089 if (strchr(drrb->drr_toname, '@') == NULL) {
2090 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "invalid "
2091 "stream (bad snapshot name)"));
2092 return (zfs_error(hdl, EZFS_BADSTREAM, errbuf));
2093 }
2094
2095 if (drrb->drr_version == DMU_BACKUP_STREAM_VERSION) {
2096 return (zfs_receive_one(hdl, infd, tosnap, flags,
2097 &drr, &drr_noswap, stream_avl, top_zfs));
2098 } else if (drrb->drr_version == DMU_BACKUP_HEADER_VERSION) {
2099 return (zfs_receive_package(hdl, infd, tosnap, flags,
2100 &drr, &zcksum, top_zfs));
2101 } else {
2102 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
2103 "stream is unsupported version %llu"),
2104 drrb->drr_version);
2105 return (zfs_error(hdl, EZFS_BADSTREAM, errbuf));
2106 }
2107 }
2108
2109 /*
2110 * Restores a backup of tosnap from the file descriptor specified by infd.
2111 * Return 0 on total success, -2 if some things couldn't be
2112 * destroyed/renamed/promoted, -1 if some things couldn't be received.
2113 * (-1 will override -2).
2114 */
2115 int
2116 zfs_receive(libzfs_handle_t *hdl, const char *tosnap, recvflags_t flags,
2117 int infd, avl_tree_t *stream_avl)
2118 {
2119 char *top_zfs = NULL;
2120 int err;
2121
2122 err = zfs_receive_impl(hdl, tosnap, flags, infd, stream_avl, &top_zfs);
2123
2124 if (err == 0 && !flags.nomount && top_zfs) {
2125 zfs_handle_t *zhp;
2126 prop_changelist_t *clp;
2127
2128 zhp = zfs_open(hdl, top_zfs, ZFS_TYPE_FILESYSTEM);
2129 if (zhp != NULL) {
2130 clp = changelist_gather(zhp, ZFS_PROP_MOUNTPOINT,
2131 CL_GATHER_MOUNT_ALWAYS, 0);
2132 zfs_close(zhp);
2133 if (clp != NULL) {
2134 /* mount and share received datasets */
2135 err = changelist_postfix(clp);
2136 changelist_free(clp);
2137 }
2138 }
2139 if (zhp == NULL || clp == NULL || err)
2140 err = -1;
2141 }
2142 if (top_zfs)
2143 free(top_zfs);
2144
2145 return (err);
2146 }
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