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--- old/usr/src/lib/libzfs/common/libzfs_sendrecv.c
+++ new/usr/src/lib/libzfs/common/libzfs_sendrecv.c
1 1 /*
2 2 * CDDL HEADER START
3 3 *
4 4 * The contents of this file are subject to the terms of the
5 5 * Common Development and Distribution License (the "License").
6 6 * You may not use this file except in compliance with the License.
7 7 *
8 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 9 * or http://www.opensolaris.org/os/licensing.
10 10 * See the License for the specific language governing permissions
11 11 * and limitations under the License.
12 12 *
13 13 * When distributing Covered Code, include this CDDL HEADER in each
14 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 15 * If applicable, add the following below this CDDL HEADER, with the
16 16 * fields enclosed by brackets "[]" replaced with your own identifying
17 17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 18 *
19 19 * CDDL HEADER END
20 20 */
21 21
22 22 /*
23 23 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
24 24 * Copyright (c) 2011, 2015 by Delphix. All rights reserved.
25 25 * Copyright (c) 2012, Joyent, Inc. All rights reserved.
26 26 * Copyright (c) 2013 Steven Hartland. All rights reserved.
27 27 * Copyright 2015, OmniTI Computer Consulting, Inc. All rights reserved.
28 28 */
29 29
30 30 #include <assert.h>
31 31 #include <ctype.h>
32 32 #include <errno.h>
33 33 #include <libintl.h>
34 34 #include <stdio.h>
35 35 #include <stdlib.h>
36 36 #include <strings.h>
37 37 #include <unistd.h>
38 38 #include <stddef.h>
39 39 #include <fcntl.h>
40 40 #include <sys/mount.h>
41 41 #include <pthread.h>
42 42 #include <umem.h>
43 43 #include <time.h>
44 44
45 45 #include <libzfs.h>
46 46 #include <libzfs_core.h>
47 47
48 48 #include "zfs_namecheck.h"
49 49 #include "zfs_prop.h"
50 50 #include "zfs_fletcher.h"
51 51 #include "libzfs_impl.h"
52 52 #include <zlib.h>
53 53 #include <sha2.h>
54 54 #include <sys/zio_checksum.h>
55 55 #include <sys/ddt.h>
56 56
57 57 /* in libzfs_dataset.c */
58 58 extern void zfs_setprop_error(libzfs_handle_t *, zfs_prop_t, int, char *);
59 59
60 60 static int zfs_receive_impl(libzfs_handle_t *, const char *, const char *,
61 61 recvflags_t *, int, const char *, nvlist_t *, avl_tree_t *, char **, int,
62 62 uint64_t *, const char *);
63 63 static int guid_to_name(libzfs_handle_t *, const char *,
64 64 uint64_t, boolean_t, char *);
65 65
66 66 static const zio_cksum_t zero_cksum = { 0 };
67 67
68 68 typedef struct dedup_arg {
69 69 int inputfd;
70 70 int outputfd;
71 71 libzfs_handle_t *dedup_hdl;
72 72 } dedup_arg_t;
73 73
74 74 typedef struct progress_arg {
75 75 zfs_handle_t *pa_zhp;
76 76 int pa_fd;
77 77 boolean_t pa_parsable;
78 78 } progress_arg_t;
79 79
80 80 typedef struct dataref {
81 81 uint64_t ref_guid;
82 82 uint64_t ref_object;
83 83 uint64_t ref_offset;
84 84 } dataref_t;
85 85
86 86 typedef struct dedup_entry {
87 87 struct dedup_entry *dde_next;
88 88 zio_cksum_t dde_chksum;
89 89 uint64_t dde_prop;
90 90 dataref_t dde_ref;
91 91 } dedup_entry_t;
92 92
93 93 #define MAX_DDT_PHYSMEM_PERCENT 20
94 94 #define SMALLEST_POSSIBLE_MAX_DDT_MB 128
95 95
96 96 typedef struct dedup_table {
97 97 dedup_entry_t **dedup_hash_array;
98 98 umem_cache_t *ddecache;
99 99 uint64_t max_ddt_size; /* max dedup table size in bytes */
100 100 uint64_t cur_ddt_size; /* current dedup table size in bytes */
101 101 uint64_t ddt_count;
102 102 int numhashbits;
103 103 boolean_t ddt_full;
104 104 } dedup_table_t;
105 105
106 106 static int
107 107 high_order_bit(uint64_t n)
108 108 {
109 109 int count;
110 110
111 111 for (count = 0; n != 0; count++)
112 112 n >>= 1;
113 113 return (count);
114 114 }
115 115
116 116 static size_t
117 117 ssread(void *buf, size_t len, FILE *stream)
118 118 {
119 119 size_t outlen;
120 120
121 121 if ((outlen = fread(buf, len, 1, stream)) == 0)
122 122 return (0);
123 123
124 124 return (outlen);
125 125 }
126 126
127 127 static void
128 128 ddt_hash_append(libzfs_handle_t *hdl, dedup_table_t *ddt, dedup_entry_t **ddepp,
129 129 zio_cksum_t *cs, uint64_t prop, dataref_t *dr)
130 130 {
131 131 dedup_entry_t *dde;
132 132
133 133 if (ddt->cur_ddt_size >= ddt->max_ddt_size) {
134 134 if (ddt->ddt_full == B_FALSE) {
135 135 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
136 136 "Dedup table full. Deduplication will continue "
137 137 "with existing table entries"));
138 138 ddt->ddt_full = B_TRUE;
139 139 }
140 140 return;
141 141 }
142 142
143 143 if ((dde = umem_cache_alloc(ddt->ddecache, UMEM_DEFAULT))
144 144 != NULL) {
145 145 assert(*ddepp == NULL);
146 146 dde->dde_next = NULL;
147 147 dde->dde_chksum = *cs;
148 148 dde->dde_prop = prop;
149 149 dde->dde_ref = *dr;
150 150 *ddepp = dde;
151 151 ddt->cur_ddt_size += sizeof (dedup_entry_t);
152 152 ddt->ddt_count++;
153 153 }
154 154 }
155 155
156 156 /*
157 157 * Using the specified dedup table, do a lookup for an entry with
158 158 * the checksum cs. If found, return the block's reference info
159 159 * in *dr. Otherwise, insert a new entry in the dedup table, using
160 160 * the reference information specified by *dr.
161 161 *
162 162 * return value: true - entry was found
163 163 * false - entry was not found
164 164 */
165 165 static boolean_t
166 166 ddt_update(libzfs_handle_t *hdl, dedup_table_t *ddt, zio_cksum_t *cs,
167 167 uint64_t prop, dataref_t *dr)
168 168 {
169 169 uint32_t hashcode;
170 170 dedup_entry_t **ddepp;
171 171
172 172 hashcode = BF64_GET(cs->zc_word[0], 0, ddt->numhashbits);
173 173
174 174 for (ddepp = &(ddt->dedup_hash_array[hashcode]); *ddepp != NULL;
175 175 ddepp = &((*ddepp)->dde_next)) {
176 176 if (ZIO_CHECKSUM_EQUAL(((*ddepp)->dde_chksum), *cs) &&
177 177 (*ddepp)->dde_prop == prop) {
178 178 *dr = (*ddepp)->dde_ref;
179 179 return (B_TRUE);
180 180 }
181 181 }
182 182 ddt_hash_append(hdl, ddt, ddepp, cs, prop, dr);
183 183 return (B_FALSE);
184 184 }
185 185
186 186 static int
187 187 dump_record(dmu_replay_record_t *drr, void *payload, int payload_len,
188 188 zio_cksum_t *zc, int outfd)
189 189 {
190 190 ASSERT3U(offsetof(dmu_replay_record_t, drr_u.drr_checksum.drr_checksum),
191 191 ==, sizeof (dmu_replay_record_t) - sizeof (zio_cksum_t));
192 192 fletcher_4_incremental_native(drr,
193 193 offsetof(dmu_replay_record_t, drr_u.drr_checksum.drr_checksum), zc);
194 194 if (drr->drr_type != DRR_BEGIN) {
195 195 ASSERT(ZIO_CHECKSUM_IS_ZERO(&drr->drr_u.
196 196 drr_checksum.drr_checksum));
197 197 drr->drr_u.drr_checksum.drr_checksum = *zc;
198 198 }
199 199 fletcher_4_incremental_native(&drr->drr_u.drr_checksum.drr_checksum,
200 200 sizeof (zio_cksum_t), zc);
201 201 if (write(outfd, drr, sizeof (*drr)) == -1)
202 202 return (errno);
203 203 if (payload_len != 0) {
204 204 fletcher_4_incremental_native(payload, payload_len, zc);
205 205 if (write(outfd, payload, payload_len) == -1)
206 206 return (errno);
207 207 }
208 208 return (0);
209 209 }
210 210
211 211 /*
212 212 * This function is started in a separate thread when the dedup option
213 213 * has been requested. The main send thread determines the list of
214 214 * snapshots to be included in the send stream and makes the ioctl calls
215 215 * for each one. But instead of having the ioctl send the output to the
216 216 * the output fd specified by the caller of zfs_send()), the
217 217 * ioctl is told to direct the output to a pipe, which is read by the
218 218 * alternate thread running THIS function. This function does the
219 219 * dedup'ing by:
220 220 * 1. building a dedup table (the DDT)
221 221 * 2. doing checksums on each data block and inserting a record in the DDT
222 222 * 3. looking for matching checksums, and
223 223 * 4. sending a DRR_WRITE_BYREF record instead of a write record whenever
224 224 * a duplicate block is found.
225 225 * The output of this function then goes to the output fd requested
226 226 * by the caller of zfs_send().
227 227 */
228 228 static void *
229 229 cksummer(void *arg)
230 230 {
231 231 dedup_arg_t *dda = arg;
232 232 char *buf = zfs_alloc(dda->dedup_hdl, SPA_MAXBLOCKSIZE);
233 233 dmu_replay_record_t thedrr;
234 234 dmu_replay_record_t *drr = &thedrr;
235 235 FILE *ofp;
236 236 int outfd;
237 237 dedup_table_t ddt;
238 238 zio_cksum_t stream_cksum;
239 239 uint64_t physmem = sysconf(_SC_PHYS_PAGES) * sysconf(_SC_PAGESIZE);
240 240 uint64_t numbuckets;
241 241
242 242 ddt.max_ddt_size =
243 243 MAX((physmem * MAX_DDT_PHYSMEM_PERCENT) / 100,
244 244 SMALLEST_POSSIBLE_MAX_DDT_MB << 20);
245 245
246 246 numbuckets = ddt.max_ddt_size / (sizeof (dedup_entry_t));
247 247
248 248 /*
249 249 * numbuckets must be a power of 2. Increase number to
250 250 * a power of 2 if necessary.
251 251 */
252 252 if (!ISP2(numbuckets))
253 253 numbuckets = 1 << high_order_bit(numbuckets);
254 254
255 255 ddt.dedup_hash_array = calloc(numbuckets, sizeof (dedup_entry_t *));
256 256 ddt.ddecache = umem_cache_create("dde", sizeof (dedup_entry_t), 0,
257 257 NULL, NULL, NULL, NULL, NULL, 0);
258 258 ddt.cur_ddt_size = numbuckets * sizeof (dedup_entry_t *);
259 259 ddt.numhashbits = high_order_bit(numbuckets) - 1;
260 260 ddt.ddt_full = B_FALSE;
261 261
262 262 outfd = dda->outputfd;
263 263 ofp = fdopen(dda->inputfd, "r");
264 264 while (ssread(drr, sizeof (*drr), ofp) != 0) {
265 265
266 266 switch (drr->drr_type) {
267 267 case DRR_BEGIN:
268 268 {
269 269 struct drr_begin *drrb = &drr->drr_u.drr_begin;
270 270 int fflags;
271 271 int sz = 0;
272 272 ZIO_SET_CHECKSUM(&stream_cksum, 0, 0, 0, 0);
273 273
274 274 ASSERT3U(drrb->drr_magic, ==, DMU_BACKUP_MAGIC);
275 275
276 276 /* set the DEDUP feature flag for this stream */
277 277 fflags = DMU_GET_FEATUREFLAGS(drrb->drr_versioninfo);
278 278 fflags |= (DMU_BACKUP_FEATURE_DEDUP |
279 279 DMU_BACKUP_FEATURE_DEDUPPROPS);
280 280 DMU_SET_FEATUREFLAGS(drrb->drr_versioninfo, fflags);
281 281
282 282 if (drr->drr_payloadlen != 0) {
283 283 sz = drr->drr_payloadlen;
284 284
285 285 if (sz > SPA_MAXBLOCKSIZE) {
286 286 buf = zfs_realloc(dda->dedup_hdl, buf,
287 287 SPA_MAXBLOCKSIZE, sz);
288 288 }
289 289 (void) ssread(buf, sz, ofp);
290 290 if (ferror(stdin))
291 291 perror("fread");
292 292 }
293 293 if (dump_record(drr, buf, sz, &stream_cksum,
294 294 outfd) != 0)
295 295 goto out;
296 296 break;
297 297 }
298 298
299 299 case DRR_END:
300 300 {
301 301 struct drr_end *drre = &drr->drr_u.drr_end;
302 302 /* use the recalculated checksum */
303 303 drre->drr_checksum = stream_cksum;
304 304 if (dump_record(drr, NULL, 0, &stream_cksum,
305 305 outfd) != 0)
306 306 goto out;
307 307 break;
308 308 }
309 309
310 310 case DRR_OBJECT:
311 311 {
312 312 struct drr_object *drro = &drr->drr_u.drr_object;
313 313 if (drro->drr_bonuslen > 0) {
314 314 (void) ssread(buf,
315 315 P2ROUNDUP((uint64_t)drro->drr_bonuslen, 8),
316 316 ofp);
317 317 }
318 318 if (dump_record(drr, buf,
319 319 P2ROUNDUP((uint64_t)drro->drr_bonuslen, 8),
320 320 &stream_cksum, outfd) != 0)
321 321 goto out;
322 322 break;
323 323 }
324 324
325 325 case DRR_SPILL:
326 326 {
327 327 struct drr_spill *drrs = &drr->drr_u.drr_spill;
328 328 (void) ssread(buf, drrs->drr_length, ofp);
329 329 if (dump_record(drr, buf, drrs->drr_length,
330 330 &stream_cksum, outfd) != 0)
331 331 goto out;
332 332 break;
333 333 }
334 334
335 335 case DRR_FREEOBJECTS:
336 336 {
337 337 if (dump_record(drr, NULL, 0, &stream_cksum,
338 338 outfd) != 0)
339 339 goto out;
340 340 break;
341 341 }
342 342
343 343 case DRR_WRITE:
344 344 {
345 345 struct drr_write *drrw = &drr->drr_u.drr_write;
346 346 dataref_t dataref;
347 347
348 348 (void) ssread(buf, drrw->drr_length, ofp);
349 349
350 350 /*
351 351 * Use the existing checksum if it's dedup-capable,
352 352 * else calculate a SHA256 checksum for it.
353 353 */
354 354
355 355 if (ZIO_CHECKSUM_EQUAL(drrw->drr_key.ddk_cksum,
356 356 zero_cksum) ||
357 357 !DRR_IS_DEDUP_CAPABLE(drrw->drr_checksumflags)) {
358 358 SHA256_CTX ctx;
359 359 zio_cksum_t tmpsha256;
360 360
361 361 SHA256Init(&ctx);
362 362 SHA256Update(&ctx, buf, drrw->drr_length);
363 363 SHA256Final(&tmpsha256, &ctx);
364 364 drrw->drr_key.ddk_cksum.zc_word[0] =
365 365 BE_64(tmpsha256.zc_word[0]);
366 366 drrw->drr_key.ddk_cksum.zc_word[1] =
367 367 BE_64(tmpsha256.zc_word[1]);
368 368 drrw->drr_key.ddk_cksum.zc_word[2] =
369 369 BE_64(tmpsha256.zc_word[2]);
370 370 drrw->drr_key.ddk_cksum.zc_word[3] =
371 371 BE_64(tmpsha256.zc_word[3]);
372 372 drrw->drr_checksumtype = ZIO_CHECKSUM_SHA256;
373 373 drrw->drr_checksumflags = DRR_CHECKSUM_DEDUP;
374 374 }
375 375
376 376 dataref.ref_guid = drrw->drr_toguid;
377 377 dataref.ref_object = drrw->drr_object;
378 378 dataref.ref_offset = drrw->drr_offset;
379 379
380 380 if (ddt_update(dda->dedup_hdl, &ddt,
381 381 &drrw->drr_key.ddk_cksum, drrw->drr_key.ddk_prop,
382 382 &dataref)) {
383 383 dmu_replay_record_t wbr_drr = {0};
384 384 struct drr_write_byref *wbr_drrr =
385 385 &wbr_drr.drr_u.drr_write_byref;
386 386
387 387 /* block already present in stream */
388 388 wbr_drr.drr_type = DRR_WRITE_BYREF;
389 389
390 390 wbr_drrr->drr_object = drrw->drr_object;
391 391 wbr_drrr->drr_offset = drrw->drr_offset;
392 392 wbr_drrr->drr_length = drrw->drr_length;
393 393 wbr_drrr->drr_toguid = drrw->drr_toguid;
394 394 wbr_drrr->drr_refguid = dataref.ref_guid;
395 395 wbr_drrr->drr_refobject =
396 396 dataref.ref_object;
397 397 wbr_drrr->drr_refoffset =
398 398 dataref.ref_offset;
399 399
400 400 wbr_drrr->drr_checksumtype =
401 401 drrw->drr_checksumtype;
402 402 wbr_drrr->drr_checksumflags =
403 403 drrw->drr_checksumtype;
404 404 wbr_drrr->drr_key.ddk_cksum =
405 405 drrw->drr_key.ddk_cksum;
406 406 wbr_drrr->drr_key.ddk_prop =
407 407 drrw->drr_key.ddk_prop;
408 408
409 409 if (dump_record(&wbr_drr, NULL, 0,
410 410 &stream_cksum, outfd) != 0)
411 411 goto out;
412 412 } else {
413 413 /* block not previously seen */
414 414 if (dump_record(drr, buf, drrw->drr_length,
415 415 &stream_cksum, outfd) != 0)
416 416 goto out;
417 417 }
418 418 break;
419 419 }
420 420
421 421 case DRR_WRITE_EMBEDDED:
422 422 {
423 423 struct drr_write_embedded *drrwe =
424 424 &drr->drr_u.drr_write_embedded;
425 425 (void) ssread(buf,
426 426 P2ROUNDUP((uint64_t)drrwe->drr_psize, 8), ofp);
427 427 if (dump_record(drr, buf,
428 428 P2ROUNDUP((uint64_t)drrwe->drr_psize, 8),
429 429 &stream_cksum, outfd) != 0)
430 430 goto out;
431 431 break;
432 432 }
433 433
434 434 case DRR_FREE:
435 435 {
436 436 if (dump_record(drr, NULL, 0, &stream_cksum,
437 437 outfd) != 0)
438 438 goto out;
439 439 break;
440 440 }
441 441
442 442 default:
443 443 (void) fprintf(stderr, "INVALID record type 0x%x\n",
444 444 drr->drr_type);
445 445 /* should never happen, so assert */
446 446 assert(B_FALSE);
447 447 }
448 448 }
449 449 out:
450 450 umem_cache_destroy(ddt.ddecache);
451 451 free(ddt.dedup_hash_array);
452 452 free(buf);
453 453 (void) fclose(ofp);
454 454
455 455 return (NULL);
456 456 }
457 457
458 458 /*
459 459 * Routines for dealing with the AVL tree of fs-nvlists
460 460 */
461 461 typedef struct fsavl_node {
462 462 avl_node_t fn_node;
463 463 nvlist_t *fn_nvfs;
464 464 char *fn_snapname;
465 465 uint64_t fn_guid;
466 466 } fsavl_node_t;
467 467
468 468 static int
469 469 fsavl_compare(const void *arg1, const void *arg2)
470 470 {
471 471 const fsavl_node_t *fn1 = arg1;
472 472 const fsavl_node_t *fn2 = arg2;
473 473
474 474 if (fn1->fn_guid > fn2->fn_guid)
475 475 return (+1);
476 476 else if (fn1->fn_guid < fn2->fn_guid)
477 477 return (-1);
478 478 else
479 479 return (0);
480 480 }
481 481
482 482 /*
483 483 * Given the GUID of a snapshot, find its containing filesystem and
484 484 * (optionally) name.
485 485 */
486 486 static nvlist_t *
487 487 fsavl_find(avl_tree_t *avl, uint64_t snapguid, char **snapname)
488 488 {
489 489 fsavl_node_t fn_find;
490 490 fsavl_node_t *fn;
491 491
492 492 fn_find.fn_guid = snapguid;
493 493
494 494 fn = avl_find(avl, &fn_find, NULL);
495 495 if (fn) {
496 496 if (snapname)
497 497 *snapname = fn->fn_snapname;
498 498 return (fn->fn_nvfs);
499 499 }
500 500 return (NULL);
501 501 }
502 502
503 503 static void
504 504 fsavl_destroy(avl_tree_t *avl)
505 505 {
506 506 fsavl_node_t *fn;
507 507 void *cookie;
508 508
509 509 if (avl == NULL)
510 510 return;
511 511
512 512 cookie = NULL;
513 513 while ((fn = avl_destroy_nodes(avl, &cookie)) != NULL)
514 514 free(fn);
515 515 avl_destroy(avl);
516 516 free(avl);
517 517 }
518 518
519 519 /*
520 520 * Given an nvlist, produce an avl tree of snapshots, ordered by guid
521 521 */
522 522 static avl_tree_t *
523 523 fsavl_create(nvlist_t *fss)
524 524 {
525 525 avl_tree_t *fsavl;
526 526 nvpair_t *fselem = NULL;
527 527
528 528 if ((fsavl = malloc(sizeof (avl_tree_t))) == NULL)
529 529 return (NULL);
530 530
531 531 avl_create(fsavl, fsavl_compare, sizeof (fsavl_node_t),
532 532 offsetof(fsavl_node_t, fn_node));
533 533
534 534 while ((fselem = nvlist_next_nvpair(fss, fselem)) != NULL) {
535 535 nvlist_t *nvfs, *snaps;
536 536 nvpair_t *snapelem = NULL;
537 537
538 538 VERIFY(0 == nvpair_value_nvlist(fselem, &nvfs));
539 539 VERIFY(0 == nvlist_lookup_nvlist(nvfs, "snaps", &snaps));
540 540
541 541 while ((snapelem =
542 542 nvlist_next_nvpair(snaps, snapelem)) != NULL) {
543 543 fsavl_node_t *fn;
544 544 uint64_t guid;
545 545
546 546 VERIFY(0 == nvpair_value_uint64(snapelem, &guid));
547 547 if ((fn = malloc(sizeof (fsavl_node_t))) == NULL) {
548 548 fsavl_destroy(fsavl);
549 549 return (NULL);
550 550 }
551 551 fn->fn_nvfs = nvfs;
552 552 fn->fn_snapname = nvpair_name(snapelem);
553 553 fn->fn_guid = guid;
554 554
555 555 /*
556 556 * Note: if there are multiple snaps with the
557 557 * same GUID, we ignore all but one.
558 558 */
559 559 if (avl_find(fsavl, fn, NULL) == NULL)
560 560 avl_add(fsavl, fn);
561 561 else
562 562 free(fn);
563 563 }
564 564 }
565 565
566 566 return (fsavl);
567 567 }
568 568
569 569 /*
570 570 * Routines for dealing with the giant nvlist of fs-nvlists, etc.
571 571 */
572 572 typedef struct send_data {
573 573 uint64_t parent_fromsnap_guid;
574 574 nvlist_t *parent_snaps;
575 575 nvlist_t *fss;
576 576 nvlist_t *snapprops;
577 577 const char *fromsnap;
578 578 const char *tosnap;
579 579 boolean_t recursive;
580 580
581 581 /*
582 582 * The header nvlist is of the following format:
583 583 * {
584 584 * "tosnap" -> string
585 585 * "fromsnap" -> string (if incremental)
586 586 * "fss" -> {
587 587 * id -> {
588 588 *
589 589 * "name" -> string (full name; for debugging)
590 590 * "parentfromsnap" -> number (guid of fromsnap in parent)
591 591 *
592 592 * "props" -> { name -> value (only if set here) }
593 593 * "snaps" -> { name (lastname) -> number (guid) }
594 594 * "snapprops" -> { name (lastname) -> { name -> value } }
595 595 *
596 596 * "origin" -> number (guid) (if clone)
597 597 * "sent" -> boolean (not on-disk)
598 598 * }
599 599 * }
600 600 * }
601 601 *
602 602 */
603 603 } send_data_t;
604 604
605 605 static void send_iterate_prop(zfs_handle_t *zhp, nvlist_t *nv);
606 606
607 607 static int
608 608 send_iterate_snap(zfs_handle_t *zhp, void *arg)
609 609 {
610 610 send_data_t *sd = arg;
611 611 uint64_t guid = zhp->zfs_dmustats.dds_guid;
612 612 char *snapname;
613 613 nvlist_t *nv;
614 614
615 615 snapname = strrchr(zhp->zfs_name, '@')+1;
616 616
617 617 VERIFY(0 == nvlist_add_uint64(sd->parent_snaps, snapname, guid));
618 618 /*
619 619 * NB: if there is no fromsnap here (it's a newly created fs in
620 620 * an incremental replication), we will substitute the tosnap.
621 621 */
622 622 if ((sd->fromsnap && strcmp(snapname, sd->fromsnap) == 0) ||
623 623 (sd->parent_fromsnap_guid == 0 && sd->tosnap &&
624 624 strcmp(snapname, sd->tosnap) == 0)) {
625 625 sd->parent_fromsnap_guid = guid;
626 626 }
627 627
628 628 VERIFY(0 == nvlist_alloc(&nv, NV_UNIQUE_NAME, 0));
629 629 send_iterate_prop(zhp, nv);
630 630 VERIFY(0 == nvlist_add_nvlist(sd->snapprops, snapname, nv));
631 631 nvlist_free(nv);
632 632
633 633 zfs_close(zhp);
634 634 return (0);
635 635 }
636 636
637 637 static void
638 638 send_iterate_prop(zfs_handle_t *zhp, nvlist_t *nv)
639 639 {
640 640 nvpair_t *elem = NULL;
641 641
642 642 while ((elem = nvlist_next_nvpair(zhp->zfs_props, elem)) != NULL) {
643 643 char *propname = nvpair_name(elem);
644 644 zfs_prop_t prop = zfs_name_to_prop(propname);
645 645 nvlist_t *propnv;
646 646
647 647 if (!zfs_prop_user(propname)) {
648 648 /*
649 649 * Realistically, this should never happen. However,
650 650 * we want the ability to add DSL properties without
651 651 * needing to make incompatible version changes. We
652 652 * need to ignore unknown properties to allow older
653 653 * software to still send datasets containing these
654 654 * properties, with the unknown properties elided.
655 655 */
656 656 if (prop == ZPROP_INVAL)
657 657 continue;
658 658
659 659 if (zfs_prop_readonly(prop))
660 660 continue;
661 661 }
662 662
663 663 verify(nvpair_value_nvlist(elem, &propnv) == 0);
664 664 if (prop == ZFS_PROP_QUOTA || prop == ZFS_PROP_RESERVATION ||
665 665 prop == ZFS_PROP_REFQUOTA ||
666 666 prop == ZFS_PROP_REFRESERVATION) {
667 667 char *source;
668 668 uint64_t value;
669 669 verify(nvlist_lookup_uint64(propnv,
670 670 ZPROP_VALUE, &value) == 0);
671 671 if (zhp->zfs_type == ZFS_TYPE_SNAPSHOT)
672 672 continue;
673 673 /*
674 674 * May have no source before SPA_VERSION_RECVD_PROPS,
675 675 * but is still modifiable.
676 676 */
677 677 if (nvlist_lookup_string(propnv,
678 678 ZPROP_SOURCE, &source) == 0) {
679 679 if ((strcmp(source, zhp->zfs_name) != 0) &&
680 680 (strcmp(source,
681 681 ZPROP_SOURCE_VAL_RECVD) != 0))
682 682 continue;
683 683 }
684 684 } else {
685 685 char *source;
686 686 if (nvlist_lookup_string(propnv,
687 687 ZPROP_SOURCE, &source) != 0)
688 688 continue;
689 689 if ((strcmp(source, zhp->zfs_name) != 0) &&
690 690 (strcmp(source, ZPROP_SOURCE_VAL_RECVD) != 0))
691 691 continue;
692 692 }
693 693
694 694 if (zfs_prop_user(propname) ||
695 695 zfs_prop_get_type(prop) == PROP_TYPE_STRING) {
696 696 char *value;
697 697 verify(nvlist_lookup_string(propnv,
698 698 ZPROP_VALUE, &value) == 0);
699 699 VERIFY(0 == nvlist_add_string(nv, propname, value));
700 700 } else {
701 701 uint64_t value;
702 702 verify(nvlist_lookup_uint64(propnv,
703 703 ZPROP_VALUE, &value) == 0);
704 704 VERIFY(0 == nvlist_add_uint64(nv, propname, value));
705 705 }
706 706 }
707 707 }
708 708
709 709 /*
710 710 * recursively generate nvlists describing datasets. See comment
711 711 * for the data structure send_data_t above for description of contents
712 712 * of the nvlist.
713 713 */
714 714 static int
715 715 send_iterate_fs(zfs_handle_t *zhp, void *arg)
716 716 {
717 717 send_data_t *sd = arg;
718 718 nvlist_t *nvfs, *nv;
719 719 int rv = 0;
720 720 uint64_t parent_fromsnap_guid_save = sd->parent_fromsnap_guid;
721 721 uint64_t guid = zhp->zfs_dmustats.dds_guid;
722 722 char guidstring[64];
723 723
724 724 VERIFY(0 == nvlist_alloc(&nvfs, NV_UNIQUE_NAME, 0));
725 725 VERIFY(0 == nvlist_add_string(nvfs, "name", zhp->zfs_name));
726 726 VERIFY(0 == nvlist_add_uint64(nvfs, "parentfromsnap",
727 727 sd->parent_fromsnap_guid));
728 728
729 729 if (zhp->zfs_dmustats.dds_origin[0]) {
730 730 zfs_handle_t *origin = zfs_open(zhp->zfs_hdl,
731 731 zhp->zfs_dmustats.dds_origin, ZFS_TYPE_SNAPSHOT);
732 732 if (origin == NULL)
733 733 return (-1);
734 734 VERIFY(0 == nvlist_add_uint64(nvfs, "origin",
735 735 origin->zfs_dmustats.dds_guid));
736 736 }
737 737
738 738 /* iterate over props */
739 739 VERIFY(0 == nvlist_alloc(&nv, NV_UNIQUE_NAME, 0));
740 740 send_iterate_prop(zhp, nv);
741 741 VERIFY(0 == nvlist_add_nvlist(nvfs, "props", nv));
742 742 nvlist_free(nv);
743 743
744 744 /* iterate over snaps, and set sd->parent_fromsnap_guid */
745 745 sd->parent_fromsnap_guid = 0;
746 746 VERIFY(0 == nvlist_alloc(&sd->parent_snaps, NV_UNIQUE_NAME, 0));
747 747 VERIFY(0 == nvlist_alloc(&sd->snapprops, NV_UNIQUE_NAME, 0));
748 748 (void) zfs_iter_snapshots(zhp, send_iterate_snap, sd);
749 749 VERIFY(0 == nvlist_add_nvlist(nvfs, "snaps", sd->parent_snaps));
750 750 VERIFY(0 == nvlist_add_nvlist(nvfs, "snapprops", sd->snapprops));
751 751 nvlist_free(sd->parent_snaps);
752 752 nvlist_free(sd->snapprops);
753 753
754 754 /* add this fs to nvlist */
755 755 (void) snprintf(guidstring, sizeof (guidstring),
756 756 "0x%llx", (longlong_t)guid);
757 757 VERIFY(0 == nvlist_add_nvlist(sd->fss, guidstring, nvfs));
758 758 nvlist_free(nvfs);
759 759
760 760 /* iterate over children */
761 761 if (sd->recursive)
762 762 rv = zfs_iter_filesystems(zhp, send_iterate_fs, sd);
763 763
764 764 sd->parent_fromsnap_guid = parent_fromsnap_guid_save;
765 765
766 766 zfs_close(zhp);
767 767 return (rv);
768 768 }
769 769
770 770 static int
771 771 gather_nvlist(libzfs_handle_t *hdl, const char *fsname, const char *fromsnap,
772 772 const char *tosnap, boolean_t recursive, nvlist_t **nvlp, avl_tree_t **avlp)
773 773 {
774 774 zfs_handle_t *zhp;
775 775 send_data_t sd = { 0 };
776 776 int error;
777 777
778 778 zhp = zfs_open(hdl, fsname, ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME);
779 779 if (zhp == NULL)
780 780 return (EZFS_BADTYPE);
781 781
782 782 VERIFY(0 == nvlist_alloc(&sd.fss, NV_UNIQUE_NAME, 0));
783 783 sd.fromsnap = fromsnap;
784 784 sd.tosnap = tosnap;
785 785 sd.recursive = recursive;
786 786
787 787 if ((error = send_iterate_fs(zhp, &sd)) != 0) {
788 788 nvlist_free(sd.fss);
789 789 if (avlp != NULL)
790 790 *avlp = NULL;
791 791 *nvlp = NULL;
792 792 return (error);
793 793 }
794 794
795 795 if (avlp != NULL && (*avlp = fsavl_create(sd.fss)) == NULL) {
796 796 nvlist_free(sd.fss);
797 797 *nvlp = NULL;
798 798 return (EZFS_NOMEM);
799 799 }
800 800
801 801 *nvlp = sd.fss;
802 802 return (0);
803 803 }
804 804
805 805 /*
806 806 * Routines specific to "zfs send"
807 807 */
808 808 typedef struct send_dump_data {
809 809 /* these are all just the short snapname (the part after the @) */
810 810 const char *fromsnap;
811 811 const char *tosnap;
812 812 char prevsnap[ZFS_MAXNAMELEN];
813 813 uint64_t prevsnap_obj;
814 814 boolean_t seenfrom, seento, replicate, doall, fromorigin;
815 815 boolean_t verbose, dryrun, parsable, progress, embed_data, std_out;
816 816 boolean_t large_block;
817 817 int outfd;
818 818 boolean_t err;
819 819 nvlist_t *fss;
820 820 nvlist_t *snapholds;
821 821 avl_tree_t *fsavl;
822 822 snapfilter_cb_t *filter_cb;
823 823 void *filter_cb_arg;
824 824 nvlist_t *debugnv;
825 825 char holdtag[ZFS_MAXNAMELEN];
826 826 int cleanup_fd;
827 827 uint64_t size;
828 828 } send_dump_data_t;
829 829
830 830 static int
831 831 estimate_ioctl(zfs_handle_t *zhp, uint64_t fromsnap_obj,
832 832 boolean_t fromorigin, uint64_t *sizep)
833 833 {
834 834 zfs_cmd_t zc = { 0 };
835 835 libzfs_handle_t *hdl = zhp->zfs_hdl;
836 836
837 837 assert(zhp->zfs_type == ZFS_TYPE_SNAPSHOT);
838 838 assert(fromsnap_obj == 0 || !fromorigin);
839 839
840 840 (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
841 841 zc.zc_obj = fromorigin;
842 842 zc.zc_sendobj = zfs_prop_get_int(zhp, ZFS_PROP_OBJSETID);
843 843 zc.zc_fromobj = fromsnap_obj;
844 844 zc.zc_guid = 1; /* estimate flag */
845 845
846 846 if (zfs_ioctl(zhp->zfs_hdl, ZFS_IOC_SEND, &zc) != 0) {
847 847 char errbuf[1024];
848 848 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
849 849 "warning: cannot estimate space for '%s'"), zhp->zfs_name);
850 850
851 851 switch (errno) {
852 852 case EXDEV:
853 853 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
854 854 "not an earlier snapshot from the same fs"));
855 855 return (zfs_error(hdl, EZFS_CROSSTARGET, errbuf));
856 856
857 857 case ENOENT:
858 858 if (zfs_dataset_exists(hdl, zc.zc_name,
859 859 ZFS_TYPE_SNAPSHOT)) {
860 860 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
861 861 "incremental source (@%s) does not exist"),
862 862 zc.zc_value);
863 863 }
864 864 return (zfs_error(hdl, EZFS_NOENT, errbuf));
865 865
866 866 case EDQUOT:
867 867 case EFBIG:
868 868 case EIO:
869 869 case ENOLINK:
870 870 case ENOSPC:
871 871 case ENOSTR:
872 872 case ENXIO:
873 873 case EPIPE:
874 874 case ERANGE:
875 875 case EFAULT:
876 876 case EROFS:
877 877 zfs_error_aux(hdl, strerror(errno));
878 878 return (zfs_error(hdl, EZFS_BADBACKUP, errbuf));
879 879
880 880 default:
881 881 return (zfs_standard_error(hdl, errno, errbuf));
882 882 }
883 883 }
884 884
885 885 *sizep = zc.zc_objset_type;
886 886
887 887 return (0);
888 888 }
889 889
890 890 /*
891 891 * Dumps a backup of the given snapshot (incremental from fromsnap if it's not
892 892 * NULL) to the file descriptor specified by outfd.
893 893 */
894 894 static int
895 895 dump_ioctl(zfs_handle_t *zhp, const char *fromsnap, uint64_t fromsnap_obj,
896 896 boolean_t fromorigin, int outfd, enum lzc_send_flags flags,
897 897 nvlist_t *debugnv)
898 898 {
899 899 zfs_cmd_t zc = { 0 };
900 900 libzfs_handle_t *hdl = zhp->zfs_hdl;
901 901 nvlist_t *thisdbg;
902 902
903 903 assert(zhp->zfs_type == ZFS_TYPE_SNAPSHOT);
904 904 assert(fromsnap_obj == 0 || !fromorigin);
905 905
906 906 (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
907 907 zc.zc_cookie = outfd;
908 908 zc.zc_obj = fromorigin;
909 909 zc.zc_sendobj = zfs_prop_get_int(zhp, ZFS_PROP_OBJSETID);
910 910 zc.zc_fromobj = fromsnap_obj;
911 911 zc.zc_flags = flags;
912 912
913 913 VERIFY(0 == nvlist_alloc(&thisdbg, NV_UNIQUE_NAME, 0));
914 914 if (fromsnap && fromsnap[0] != '\0') {
915 915 VERIFY(0 == nvlist_add_string(thisdbg,
916 916 "fromsnap", fromsnap));
917 917 }
918 918
919 919 if (zfs_ioctl(zhp->zfs_hdl, ZFS_IOC_SEND, &zc) != 0) {
920 920 char errbuf[1024];
921 921 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
922 922 "warning: cannot send '%s'"), zhp->zfs_name);
923 923
924 924 VERIFY(0 == nvlist_add_uint64(thisdbg, "error", errno));
925 925 if (debugnv) {
926 926 VERIFY(0 == nvlist_add_nvlist(debugnv,
927 927 zhp->zfs_name, thisdbg));
928 928 }
929 929 nvlist_free(thisdbg);
930 930
931 931 switch (errno) {
932 932 case EXDEV:
933 933 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
934 934 "not an earlier snapshot from the same fs"));
935 935 return (zfs_error(hdl, EZFS_CROSSTARGET, errbuf));
936 936
937 937 case ENOENT:
938 938 if (zfs_dataset_exists(hdl, zc.zc_name,
939 939 ZFS_TYPE_SNAPSHOT)) {
940 940 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
941 941 "incremental source (@%s) does not exist"),
942 942 zc.zc_value);
943 943 }
944 944 return (zfs_error(hdl, EZFS_NOENT, errbuf));
945 945
946 946 case EDQUOT:
947 947 case EFBIG:
948 948 case EIO:
949 949 case ENOLINK:
950 950 case ENOSPC:
951 951 case ENOSTR:
952 952 case ENXIO:
953 953 case EPIPE:
954 954 case ERANGE:
955 955 case EFAULT:
956 956 case EROFS:
957 957 zfs_error_aux(hdl, strerror(errno));
958 958 return (zfs_error(hdl, EZFS_BADBACKUP, errbuf));
959 959
960 960 default:
961 961 return (zfs_standard_error(hdl, errno, errbuf));
962 962 }
963 963 }
964 964
965 965 if (debugnv)
966 966 VERIFY(0 == nvlist_add_nvlist(debugnv, zhp->zfs_name, thisdbg));
967 967 nvlist_free(thisdbg);
968 968
969 969 return (0);
970 970 }
971 971
972 972 static void
973 973 gather_holds(zfs_handle_t *zhp, send_dump_data_t *sdd)
974 974 {
975 975 assert(zhp->zfs_type == ZFS_TYPE_SNAPSHOT);
976 976
977 977 /*
978 978 * zfs_send() only sets snapholds for sends that need them,
979 979 * e.g. replication and doall.
980 980 */
981 981 if (sdd->snapholds == NULL)
982 982 return;
983 983
984 984 fnvlist_add_string(sdd->snapholds, zhp->zfs_name, sdd->holdtag);
985 985 }
986 986
987 987 static void *
988 988 send_progress_thread(void *arg)
989 989 {
990 990 progress_arg_t *pa = arg;
991 991 zfs_cmd_t zc = { 0 };
992 992 zfs_handle_t *zhp = pa->pa_zhp;
993 993 libzfs_handle_t *hdl = zhp->zfs_hdl;
994 994 unsigned long long bytes;
995 995 char buf[16];
996 996 time_t t;
997 997 struct tm *tm;
998 998
999 999 (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
1000 1000
1001 1001 if (!pa->pa_parsable)
1002 1002 (void) fprintf(stderr, "TIME SENT SNAPSHOT\n");
1003 1003
1004 1004 /*
1005 1005 * Print the progress from ZFS_IOC_SEND_PROGRESS every second.
1006 1006 */
1007 1007 for (;;) {
1008 1008 (void) sleep(1);
1009 1009
1010 1010 zc.zc_cookie = pa->pa_fd;
1011 1011 if (zfs_ioctl(hdl, ZFS_IOC_SEND_PROGRESS, &zc) != 0)
1012 1012 return ((void *)-1);
1013 1013
1014 1014 (void) time(&t);
1015 1015 tm = localtime(&t);
1016 1016 bytes = zc.zc_cookie;
1017 1017
1018 1018 if (pa->pa_parsable) {
1019 1019 (void) fprintf(stderr, "%02d:%02d:%02d\t%llu\t%s\n",
1020 1020 tm->tm_hour, tm->tm_min, tm->tm_sec,
1021 1021 bytes, zhp->zfs_name);
1022 1022 } else {
1023 1023 zfs_nicenum(bytes, buf, sizeof (buf));
1024 1024 (void) fprintf(stderr, "%02d:%02d:%02d %5s %s\n",
1025 1025 tm->tm_hour, tm->tm_min, tm->tm_sec,
1026 1026 buf, zhp->zfs_name);
1027 1027 }
1028 1028 }
1029 1029 }
1030 1030
1031 1031 static void
1032 1032 send_print_verbose(FILE *fout, const char *tosnap, const char *fromsnap,
1033 1033 uint64_t size, boolean_t parsable)
1034 1034 {
1035 1035 if (parsable) {
1036 1036 if (fromsnap != NULL) {
1037 1037 (void) fprintf(fout, "incremental\t%s\t%s",
1038 1038 fromsnap, tosnap);
1039 1039 } else {
1040 1040 (void) fprintf(fout, "full\t%s",
1041 1041 tosnap);
1042 1042 }
1043 1043 } else {
1044 1044 if (fromsnap != NULL) {
1045 1045 if (strchr(fromsnap, '@') == NULL &&
1046 1046 strchr(fromsnap, '#') == NULL) {
1047 1047 (void) fprintf(fout, dgettext(TEXT_DOMAIN,
1048 1048 "send from @%s to %s"),
1049 1049 fromsnap, tosnap);
1050 1050 } else {
1051 1051 (void) fprintf(fout, dgettext(TEXT_DOMAIN,
1052 1052 "send from %s to %s"),
1053 1053 fromsnap, tosnap);
1054 1054 }
1055 1055 } else {
1056 1056 (void) fprintf(fout, dgettext(TEXT_DOMAIN,
1057 1057 "full send of %s"),
1058 1058 tosnap);
1059 1059 }
1060 1060 }
1061 1061
1062 1062 if (size != 0) {
1063 1063 if (parsable) {
1064 1064 (void) fprintf(fout, "\t%llu",
1065 1065 (longlong_t)size);
1066 1066 } else {
1067 1067 char buf[16];
1068 1068 zfs_nicenum(size, buf, sizeof (buf));
1069 1069 (void) fprintf(fout, dgettext(TEXT_DOMAIN,
1070 1070 " estimated size is %s"), buf);
1071 1071 }
1072 1072 }
1073 1073 (void) fprintf(fout, "\n");
1074 1074 }
1075 1075
1076 1076 static int
1077 1077 dump_snapshot(zfs_handle_t *zhp, void *arg)
1078 1078 {
1079 1079 send_dump_data_t *sdd = arg;
1080 1080 progress_arg_t pa = { 0 };
1081 1081 pthread_t tid;
1082 1082 char *thissnap;
1083 1083 int err;
1084 1084 boolean_t isfromsnap, istosnap, fromorigin;
1085 1085 boolean_t exclude = B_FALSE;
1086 1086 FILE *fout = sdd->std_out ? stdout : stderr;
1087 1087
1088 1088 err = 0;
1089 1089 thissnap = strchr(zhp->zfs_name, '@') + 1;
1090 1090 isfromsnap = (sdd->fromsnap != NULL &&
1091 1091 strcmp(sdd->fromsnap, thissnap) == 0);
1092 1092
1093 1093 if (!sdd->seenfrom && isfromsnap) {
1094 1094 gather_holds(zhp, sdd);
1095 1095 sdd->seenfrom = B_TRUE;
1096 1096 (void) strcpy(sdd->prevsnap, thissnap);
1097 1097 sdd->prevsnap_obj = zfs_prop_get_int(zhp, ZFS_PROP_OBJSETID);
1098 1098 zfs_close(zhp);
1099 1099 return (0);
1100 1100 }
1101 1101
1102 1102 if (sdd->seento || !sdd->seenfrom) {
1103 1103 zfs_close(zhp);
1104 1104 return (0);
1105 1105 }
1106 1106
1107 1107 istosnap = (strcmp(sdd->tosnap, thissnap) == 0);
1108 1108 if (istosnap)
1109 1109 sdd->seento = B_TRUE;
1110 1110
1111 1111 if (!sdd->doall && !isfromsnap && !istosnap) {
1112 1112 if (sdd->replicate) {
1113 1113 char *snapname;
1114 1114 nvlist_t *snapprops;
1115 1115 /*
1116 1116 * Filter out all intermediate snapshots except origin
1117 1117 * snapshots needed to replicate clones.
1118 1118 */
1119 1119 nvlist_t *nvfs = fsavl_find(sdd->fsavl,
1120 1120 zhp->zfs_dmustats.dds_guid, &snapname);
1121 1121
1122 1122 VERIFY(0 == nvlist_lookup_nvlist(nvfs,
1123 1123 "snapprops", &snapprops));
1124 1124 VERIFY(0 == nvlist_lookup_nvlist(snapprops,
1125 1125 thissnap, &snapprops));
1126 1126 exclude = !nvlist_exists(snapprops, "is_clone_origin");
1127 1127 } else {
1128 1128 exclude = B_TRUE;
1129 1129 }
1130 1130 }
1131 1131
1132 1132 /*
1133 1133 * If a filter function exists, call it to determine whether
1134 1134 * this snapshot will be sent.
1135 1135 */
1136 1136 if (exclude || (sdd->filter_cb != NULL &&
1137 1137 sdd->filter_cb(zhp, sdd->filter_cb_arg) == B_FALSE)) {
1138 1138 /*
1139 1139 * This snapshot is filtered out. Don't send it, and don't
1140 1140 * set prevsnap_obj, so it will be as if this snapshot didn't
1141 1141 * exist, and the next accepted snapshot will be sent as
1142 1142 * an incremental from the last accepted one, or as the
1143 1143 * first (and full) snapshot in the case of a replication,
1144 1144 * non-incremental send.
1145 1145 */
1146 1146 zfs_close(zhp);
1147 1147 return (0);
1148 1148 }
1149 1149
1150 1150 gather_holds(zhp, sdd);
1151 1151 fromorigin = sdd->prevsnap[0] == '\0' &&
1152 1152 (sdd->fromorigin || sdd->replicate);
1153 1153
1154 1154 if (sdd->verbose) {
1155 1155 uint64_t size = 0;
1156 1156 (void) estimate_ioctl(zhp, sdd->prevsnap_obj,
1157 1157 fromorigin, &size);
1158 1158
1159 1159 send_print_verbose(fout, zhp->zfs_name,
1160 1160 sdd->prevsnap[0] ? sdd->prevsnap : NULL,
1161 1161 size, sdd->parsable);
1162 1162 sdd->size += size;
1163 1163 }
1164 1164
1165 1165 if (!sdd->dryrun) {
1166 1166 /*
1167 1167 * If progress reporting is requested, spawn a new thread to
1168 1168 * poll ZFS_IOC_SEND_PROGRESS at a regular interval.
1169 1169 */
1170 1170 if (sdd->progress) {
1171 1171 pa.pa_zhp = zhp;
1172 1172 pa.pa_fd = sdd->outfd;
1173 1173 pa.pa_parsable = sdd->parsable;
1174 1174
1175 1175 if (err = pthread_create(&tid, NULL,
1176 1176 send_progress_thread, &pa)) {
1177 1177 zfs_close(zhp);
1178 1178 return (err);
1179 1179 }
1180 1180 }
1181 1181
1182 1182 enum lzc_send_flags flags = 0;
1183 1183 if (sdd->large_block)
1184 1184 flags |= LZC_SEND_FLAG_LARGE_BLOCK;
1185 1185 if (sdd->embed_data)
1186 1186 flags |= LZC_SEND_FLAG_EMBED_DATA;
1187 1187
1188 1188 err = dump_ioctl(zhp, sdd->prevsnap, sdd->prevsnap_obj,
1189 1189 fromorigin, sdd->outfd, flags, sdd->debugnv);
1190 1190
1191 1191 if (sdd->progress) {
1192 1192 (void) pthread_cancel(tid);
1193 1193 (void) pthread_join(tid, NULL);
1194 1194 }
1195 1195 }
1196 1196
1197 1197 (void) strcpy(sdd->prevsnap, thissnap);
1198 1198 sdd->prevsnap_obj = zfs_prop_get_int(zhp, ZFS_PROP_OBJSETID);
1199 1199 zfs_close(zhp);
1200 1200 return (err);
1201 1201 }
1202 1202
1203 1203 static int
1204 1204 dump_filesystem(zfs_handle_t *zhp, void *arg)
1205 1205 {
1206 1206 int rv = 0;
1207 1207 send_dump_data_t *sdd = arg;
1208 1208 boolean_t missingfrom = B_FALSE;
1209 1209 zfs_cmd_t zc = { 0 };
1210 1210
1211 1211 (void) snprintf(zc.zc_name, sizeof (zc.zc_name), "%s@%s",
1212 1212 zhp->zfs_name, sdd->tosnap);
1213 1213 if (ioctl(zhp->zfs_hdl->libzfs_fd, ZFS_IOC_OBJSET_STATS, &zc) != 0) {
1214 1214 (void) fprintf(stderr, dgettext(TEXT_DOMAIN,
1215 1215 "WARNING: could not send %s@%s: does not exist\n"),
1216 1216 zhp->zfs_name, sdd->tosnap);
1217 1217 sdd->err = B_TRUE;
1218 1218 return (0);
1219 1219 }
1220 1220
1221 1221 if (sdd->replicate && sdd->fromsnap) {
1222 1222 /*
1223 1223 * If this fs does not have fromsnap, and we're doing
1224 1224 * recursive, we need to send a full stream from the
1225 1225 * beginning (or an incremental from the origin if this
1226 1226 * is a clone). If we're doing non-recursive, then let
1227 1227 * them get the error.
1228 1228 */
1229 1229 (void) snprintf(zc.zc_name, sizeof (zc.zc_name), "%s@%s",
1230 1230 zhp->zfs_name, sdd->fromsnap);
1231 1231 if (ioctl(zhp->zfs_hdl->libzfs_fd,
1232 1232 ZFS_IOC_OBJSET_STATS, &zc) != 0) {
1233 1233 missingfrom = B_TRUE;
1234 1234 }
1235 1235 }
1236 1236
1237 1237 sdd->seenfrom = sdd->seento = sdd->prevsnap[0] = 0;
1238 1238 sdd->prevsnap_obj = 0;
1239 1239 if (sdd->fromsnap == NULL || missingfrom)
1240 1240 sdd->seenfrom = B_TRUE;
1241 1241
1242 1242 rv = zfs_iter_snapshots_sorted(zhp, dump_snapshot, arg);
1243 1243 if (!sdd->seenfrom) {
1244 1244 (void) fprintf(stderr, dgettext(TEXT_DOMAIN,
1245 1245 "WARNING: could not send %s@%s:\n"
1246 1246 "incremental source (%s@%s) does not exist\n"),
1247 1247 zhp->zfs_name, sdd->tosnap,
1248 1248 zhp->zfs_name, sdd->fromsnap);
1249 1249 sdd->err = B_TRUE;
1250 1250 } else if (!sdd->seento) {
1251 1251 if (sdd->fromsnap) {
1252 1252 (void) fprintf(stderr, dgettext(TEXT_DOMAIN,
1253 1253 "WARNING: could not send %s@%s:\n"
1254 1254 "incremental source (%s@%s) "
1255 1255 "is not earlier than it\n"),
1256 1256 zhp->zfs_name, sdd->tosnap,
1257 1257 zhp->zfs_name, sdd->fromsnap);
1258 1258 } else {
1259 1259 (void) fprintf(stderr, dgettext(TEXT_DOMAIN,
1260 1260 "WARNING: "
1261 1261 "could not send %s@%s: does not exist\n"),
1262 1262 zhp->zfs_name, sdd->tosnap);
1263 1263 }
1264 1264 sdd->err = B_TRUE;
1265 1265 }
1266 1266
1267 1267 return (rv);
1268 1268 }
1269 1269
1270 1270 static int
1271 1271 dump_filesystems(zfs_handle_t *rzhp, void *arg)
1272 1272 {
1273 1273 send_dump_data_t *sdd = arg;
1274 1274 nvpair_t *fspair;
1275 1275 boolean_t needagain, progress;
1276 1276
1277 1277 if (!sdd->replicate)
1278 1278 return (dump_filesystem(rzhp, sdd));
1279 1279
1280 1280 /* Mark the clone origin snapshots. */
1281 1281 for (fspair = nvlist_next_nvpair(sdd->fss, NULL); fspair;
1282 1282 fspair = nvlist_next_nvpair(sdd->fss, fspair)) {
1283 1283 nvlist_t *nvfs;
1284 1284 uint64_t origin_guid = 0;
1285 1285
1286 1286 VERIFY(0 == nvpair_value_nvlist(fspair, &nvfs));
1287 1287 (void) nvlist_lookup_uint64(nvfs, "origin", &origin_guid);
1288 1288 if (origin_guid != 0) {
1289 1289 char *snapname;
1290 1290 nvlist_t *origin_nv = fsavl_find(sdd->fsavl,
1291 1291 origin_guid, &snapname);
1292 1292 if (origin_nv != NULL) {
1293 1293 nvlist_t *snapprops;
1294 1294 VERIFY(0 == nvlist_lookup_nvlist(origin_nv,
1295 1295 "snapprops", &snapprops));
1296 1296 VERIFY(0 == nvlist_lookup_nvlist(snapprops,
1297 1297 snapname, &snapprops));
1298 1298 VERIFY(0 == nvlist_add_boolean(
1299 1299 snapprops, "is_clone_origin"));
1300 1300 }
1301 1301 }
1302 1302 }
1303 1303 again:
1304 1304 needagain = progress = B_FALSE;
1305 1305 for (fspair = nvlist_next_nvpair(sdd->fss, NULL); fspair;
1306 1306 fspair = nvlist_next_nvpair(sdd->fss, fspair)) {
1307 1307 nvlist_t *fslist, *parent_nv;
1308 1308 char *fsname;
1309 1309 zfs_handle_t *zhp;
1310 1310 int err;
1311 1311 uint64_t origin_guid = 0;
1312 1312 uint64_t parent_guid = 0;
1313 1313
1314 1314 VERIFY(nvpair_value_nvlist(fspair, &fslist) == 0);
1315 1315 if (nvlist_lookup_boolean(fslist, "sent") == 0)
1316 1316 continue;
1317 1317
1318 1318 VERIFY(nvlist_lookup_string(fslist, "name", &fsname) == 0);
1319 1319 (void) nvlist_lookup_uint64(fslist, "origin", &origin_guid);
1320 1320 (void) nvlist_lookup_uint64(fslist, "parentfromsnap",
1321 1321 &parent_guid);
1322 1322
1323 1323 if (parent_guid != 0) {
1324 1324 parent_nv = fsavl_find(sdd->fsavl, parent_guid, NULL);
1325 1325 if (!nvlist_exists(parent_nv, "sent")) {
1326 1326 /* parent has not been sent; skip this one */
1327 1327 needagain = B_TRUE;
1328 1328 continue;
1329 1329 }
1330 1330 }
1331 1331
1332 1332 if (origin_guid != 0) {
1333 1333 nvlist_t *origin_nv = fsavl_find(sdd->fsavl,
1334 1334 origin_guid, NULL);
1335 1335 if (origin_nv != NULL &&
1336 1336 !nvlist_exists(origin_nv, "sent")) {
1337 1337 /*
1338 1338 * origin has not been sent yet;
1339 1339 * skip this clone.
1340 1340 */
1341 1341 needagain = B_TRUE;
1342 1342 continue;
1343 1343 }
1344 1344 }
1345 1345
1346 1346 zhp = zfs_open(rzhp->zfs_hdl, fsname, ZFS_TYPE_DATASET);
1347 1347 if (zhp == NULL)
1348 1348 return (-1);
1349 1349 err = dump_filesystem(zhp, sdd);
1350 1350 VERIFY(nvlist_add_boolean(fslist, "sent") == 0);
1351 1351 progress = B_TRUE;
1352 1352 zfs_close(zhp);
1353 1353 if (err)
1354 1354 return (err);
1355 1355 }
1356 1356 if (needagain) {
1357 1357 assert(progress);
1358 1358 goto again;
1359 1359 }
1360 1360
1361 1361 /* clean out the sent flags in case we reuse this fss */
1362 1362 for (fspair = nvlist_next_nvpair(sdd->fss, NULL); fspair;
1363 1363 fspair = nvlist_next_nvpair(sdd->fss, fspair)) {
1364 1364 nvlist_t *fslist;
1365 1365
1366 1366 VERIFY(nvpair_value_nvlist(fspair, &fslist) == 0);
1367 1367 (void) nvlist_remove_all(fslist, "sent");
1368 1368 }
1369 1369
1370 1370 return (0);
1371 1371 }
1372 1372
1373 1373 nvlist_t *
1374 1374 zfs_send_resume_token_to_nvlist(libzfs_handle_t *hdl, const char *token)
1375 1375 {
1376 1376 unsigned int version;
1377 1377 int nread;
1378 1378 unsigned long long checksum, packed_len;
1379 1379
1380 1380 /*
1381 1381 * Decode token header, which is:
1382 1382 * <token version>-<checksum of payload>-<uncompressed payload length>
1383 1383 * Note that the only supported token version is 1.
1384 1384 */
1385 1385 nread = sscanf(token, "%u-%llx-%llx-",
1386 1386 &version, &checksum, &packed_len);
1387 1387 if (nread != 3) {
1388 1388 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1389 1389 "resume token is corrupt (invalid format)"));
1390 1390 return (NULL);
1391 1391 }
1392 1392
1393 1393 if (version != ZFS_SEND_RESUME_TOKEN_VERSION) {
1394 1394 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1395 1395 "resume token is corrupt (invalid version %u)"),
1396 1396 version);
1397 1397 return (NULL);
1398 1398 }
1399 1399
1400 1400 /* convert hexadecimal representation to binary */
1401 1401 token = strrchr(token, '-') + 1;
1402 1402 int len = strlen(token) / 2;
1403 1403 unsigned char *compressed = zfs_alloc(hdl, len);
1404 1404 for (int i = 0; i < len; i++) {
1405 1405 nread = sscanf(token + i * 2, "%2hhx", compressed + i);
1406 1406 if (nread != 1) {
1407 1407 free(compressed);
1408 1408 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1409 1409 "resume token is corrupt "
1410 1410 "(payload is not hex-encoded)"));
1411 1411 return (NULL);
1412 1412 }
1413 1413 }
1414 1414
1415 1415 /* verify checksum */
1416 1416 zio_cksum_t cksum;
1417 1417 fletcher_4_native(compressed, len, NULL, &cksum);
1418 1418 if (cksum.zc_word[0] != checksum) {
1419 1419 free(compressed);
1420 1420 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1421 1421 "resume token is corrupt (incorrect checksum)"));
1422 1422 return (NULL);
1423 1423 }
1424 1424
1425 1425 /* uncompress */
1426 1426 void *packed = zfs_alloc(hdl, packed_len);
1427 1427 uLongf packed_len_long = packed_len;
1428 1428 if (uncompress(packed, &packed_len_long, compressed, len) != Z_OK ||
1429 1429 packed_len_long != packed_len) {
1430 1430 free(packed);
1431 1431 free(compressed);
1432 1432 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1433 1433 "resume token is corrupt (decompression failed)"));
1434 1434 return (NULL);
1435 1435 }
1436 1436
1437 1437 /* unpack nvlist */
1438 1438 nvlist_t *nv;
1439 1439 int error = nvlist_unpack(packed, packed_len, &nv, KM_SLEEP);
1440 1440 free(packed);
1441 1441 free(compressed);
1442 1442 if (error != 0) {
1443 1443 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1444 1444 "resume token is corrupt (nvlist_unpack failed)"));
1445 1445 return (NULL);
1446 1446 }
1447 1447 return (nv);
1448 1448 }
1449 1449
1450 1450 int
1451 1451 zfs_send_resume(libzfs_handle_t *hdl, sendflags_t *flags, int outfd,
1452 1452 const char *resume_token)
1453 1453 {
1454 1454 char errbuf[1024];
1455 1455 char *toname;
1456 1456 char *fromname = NULL;
1457 1457 uint64_t resumeobj, resumeoff, toguid, fromguid, bytes;
1458 1458 zfs_handle_t *zhp;
1459 1459 int error = 0;
1460 1460 char name[ZFS_MAXNAMELEN];
1461 1461 enum lzc_send_flags lzc_flags = 0;
1462 1462
1463 1463 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
1464 1464 "cannot resume send"));
1465 1465
1466 1466 nvlist_t *resume_nvl =
1467 1467 zfs_send_resume_token_to_nvlist(hdl, resume_token);
1468 1468 if (resume_nvl == NULL) {
1469 1469 /*
1470 1470 * zfs_error_aux has already been set by
1471 1471 * zfs_send_resume_token_to_nvlist
1472 1472 */
1473 1473 return (zfs_error(hdl, EZFS_FAULT, errbuf));
1474 1474 }
1475 1475 if (flags->verbose) {
1476 1476 (void) fprintf(stderr, dgettext(TEXT_DOMAIN,
1477 1477 "resume token contents:\n"));
1478 1478 nvlist_print(stderr, resume_nvl);
1479 1479 }
1480 1480
1481 1481 if (nvlist_lookup_string(resume_nvl, "toname", &toname) != 0 ||
1482 1482 nvlist_lookup_uint64(resume_nvl, "object", &resumeobj) != 0 ||
1483 1483 nvlist_lookup_uint64(resume_nvl, "offset", &resumeoff) != 0 ||
1484 1484 nvlist_lookup_uint64(resume_nvl, "bytes", &bytes) != 0 ||
1485 1485 nvlist_lookup_uint64(resume_nvl, "toguid", &toguid) != 0) {
1486 1486 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1487 1487 "resume token is corrupt"));
1488 1488 return (zfs_error(hdl, EZFS_FAULT, errbuf));
1489 1489 }
1490 1490 fromguid = 0;
1491 1491 (void) nvlist_lookup_uint64(resume_nvl, "fromguid", &fromguid);
1492 1492
1493 1493 if (flags->embed_data || nvlist_exists(resume_nvl, "embedok"))
1494 1494 lzc_flags |= LZC_SEND_FLAG_EMBED_DATA;
1495 1495
1496 1496 if (guid_to_name(hdl, toname, toguid, B_FALSE, name) != 0) {
1497 1497 if (zfs_dataset_exists(hdl, toname, ZFS_TYPE_DATASET)) {
1498 1498 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1499 1499 "'%s' is no longer the same snapshot used in "
1500 1500 "the initial send"), toname);
1501 1501 } else {
1502 1502 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1503 1503 "'%s' used in the initial send no longer exists"),
1504 1504 toname);
1505 1505 }
1506 1506 return (zfs_error(hdl, EZFS_BADPATH, errbuf));
1507 1507 }
1508 1508 zhp = zfs_open(hdl, name, ZFS_TYPE_DATASET);
1509 1509 if (zhp == NULL) {
1510 1510 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1511 1511 "unable to access '%s'"), name);
1512 1512 return (zfs_error(hdl, EZFS_BADPATH, errbuf));
1513 1513 }
1514 1514
1515 1515 if (fromguid != 0) {
1516 1516 if (guid_to_name(hdl, toname, fromguid, B_TRUE, name) != 0) {
1517 1517 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1518 1518 "incremental source %#llx no longer exists"),
1519 1519 (longlong_t)fromguid);
1520 1520 return (zfs_error(hdl, EZFS_BADPATH, errbuf));
1521 1521 }
1522 1522 fromname = name;
1523 1523 }
1524 1524
1525 1525 if (flags->verbose) {
1526 1526 uint64_t size = 0;
1527 1527 error = lzc_send_space(zhp->zfs_name, fromname, &size);
1528 1528 if (error == 0)
1529 1529 size = MAX(0, (int64_t)(size - bytes));
1530 1530 send_print_verbose(stderr, zhp->zfs_name, fromname,
1531 1531 size, flags->parsable);
1532 1532 }
1533 1533
1534 1534 if (!flags->dryrun) {
1535 1535 progress_arg_t pa = { 0 };
1536 1536 pthread_t tid;
1537 1537 /*
1538 1538 * If progress reporting is requested, spawn a new thread to
1539 1539 * poll ZFS_IOC_SEND_PROGRESS at a regular interval.
1540 1540 */
1541 1541 if (flags->progress) {
1542 1542 pa.pa_zhp = zhp;
1543 1543 pa.pa_fd = outfd;
1544 1544 pa.pa_parsable = flags->parsable;
1545 1545
1546 1546 error = pthread_create(&tid, NULL,
1547 1547 send_progress_thread, &pa);
1548 1548 if (error != 0) {
1549 1549 zfs_close(zhp);
1550 1550 return (error);
1551 1551 }
1552 1552 }
1553 1553
1554 1554 error = lzc_send_resume(zhp->zfs_name, fromname, outfd,
1555 1555 lzc_flags, resumeobj, resumeoff);
1556 1556
1557 1557 if (flags->progress) {
1558 1558 (void) pthread_cancel(tid);
1559 1559 (void) pthread_join(tid, NULL);
1560 1560 }
1561 1561
1562 1562 char errbuf[1024];
1563 1563 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
1564 1564 "warning: cannot send '%s'"), zhp->zfs_name);
1565 1565
1566 1566 zfs_close(zhp);
1567 1567
1568 1568 switch (error) {
1569 1569 case 0:
1570 1570 return (0);
1571 1571 case EXDEV:
1572 1572 case ENOENT:
1573 1573 case EDQUOT:
1574 1574 case EFBIG:
1575 1575 case EIO:
1576 1576 case ENOLINK:
1577 1577 case ENOSPC:
1578 1578 case ENOSTR:
1579 1579 case ENXIO:
1580 1580 case EPIPE:
1581 1581 case ERANGE:
1582 1582 case EFAULT:
1583 1583 case EROFS:
1584 1584 zfs_error_aux(hdl, strerror(errno));
1585 1585 return (zfs_error(hdl, EZFS_BADBACKUP, errbuf));
1586 1586
1587 1587 default:
1588 1588 return (zfs_standard_error(hdl, errno, errbuf));
1589 1589 }
1590 1590 }
1591 1591
1592 1592
1593 1593 zfs_close(zhp);
1594 1594
1595 1595 return (error);
1596 1596 }
1597 1597
1598 1598 /*
1599 1599 * Generate a send stream for the dataset identified by the argument zhp.
1600 1600 *
1601 1601 * The content of the send stream is the snapshot identified by
1602 1602 * 'tosnap'. Incremental streams are requested in two ways:
1603 1603 * - from the snapshot identified by "fromsnap" (if non-null) or
1604 1604 * - from the origin of the dataset identified by zhp, which must
1605 1605 * be a clone. In this case, "fromsnap" is null and "fromorigin"
1606 1606 * is TRUE.
1607 1607 *
1608 1608 * The send stream is recursive (i.e. dumps a hierarchy of snapshots) and
1609 1609 * uses a special header (with a hdrtype field of DMU_COMPOUNDSTREAM)
1610 1610 * if "replicate" is set. If "doall" is set, dump all the intermediate
1611 1611 * snapshots. The DMU_COMPOUNDSTREAM header is used in the "doall"
1612 1612 * case too. If "props" is set, send properties.
1613 1613 */
1614 1614 int
1615 1615 zfs_send(zfs_handle_t *zhp, const char *fromsnap, const char *tosnap,
1616 1616 sendflags_t *flags, int outfd, snapfilter_cb_t filter_func,
1617 1617 void *cb_arg, nvlist_t **debugnvp)
1618 1618 {
1619 1619 char errbuf[1024];
1620 1620 send_dump_data_t sdd = { 0 };
1621 1621 int err = 0;
1622 1622 nvlist_t *fss = NULL;
1623 1623 avl_tree_t *fsavl = NULL;
1624 1624 static uint64_t holdseq;
1625 1625 int spa_version;
1626 1626 pthread_t tid = 0;
1627 1627 int pipefd[2];
1628 1628 dedup_arg_t dda = { 0 };
1629 1629 int featureflags = 0;
1630 1630 FILE *fout;
1631 1631
1632 1632 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
1633 1633 "cannot send '%s'"), zhp->zfs_name);
1634 1634
1635 1635 if (fromsnap && fromsnap[0] == '\0') {
1636 1636 zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN,
1637 1637 "zero-length incremental source"));
1638 1638 return (zfs_error(zhp->zfs_hdl, EZFS_NOENT, errbuf));
1639 1639 }
1640 1640
1641 1641 if (zhp->zfs_type == ZFS_TYPE_FILESYSTEM) {
1642 1642 uint64_t version;
1643 1643 version = zfs_prop_get_int(zhp, ZFS_PROP_VERSION);
1644 1644 if (version >= ZPL_VERSION_SA) {
1645 1645 featureflags |= DMU_BACKUP_FEATURE_SA_SPILL;
1646 1646 }
1647 1647 }
1648 1648
1649 1649 if (flags->dedup && !flags->dryrun) {
1650 1650 featureflags |= (DMU_BACKUP_FEATURE_DEDUP |
1651 1651 DMU_BACKUP_FEATURE_DEDUPPROPS);
1652 1652 if (err = pipe(pipefd)) {
1653 1653 zfs_error_aux(zhp->zfs_hdl, strerror(errno));
1654 1654 return (zfs_error(zhp->zfs_hdl, EZFS_PIPEFAILED,
1655 1655 errbuf));
1656 1656 }
1657 1657 dda.outputfd = outfd;
1658 1658 dda.inputfd = pipefd[1];
1659 1659 dda.dedup_hdl = zhp->zfs_hdl;
1660 1660 if (err = pthread_create(&tid, NULL, cksummer, &dda)) {
1661 1661 (void) close(pipefd[0]);
1662 1662 (void) close(pipefd[1]);
1663 1663 zfs_error_aux(zhp->zfs_hdl, strerror(errno));
1664 1664 return (zfs_error(zhp->zfs_hdl,
1665 1665 EZFS_THREADCREATEFAILED, errbuf));
1666 1666 }
1667 1667 }
1668 1668
1669 1669 if (flags->replicate || flags->doall || flags->props) {
1670 1670 dmu_replay_record_t drr = { 0 };
1671 1671 char *packbuf = NULL;
1672 1672 size_t buflen = 0;
1673 1673 zio_cksum_t zc = { 0 };
1674 1674
1675 1675 if (flags->replicate || flags->props) {
1676 1676 nvlist_t *hdrnv;
1677 1677
1678 1678 VERIFY(0 == nvlist_alloc(&hdrnv, NV_UNIQUE_NAME, 0));
1679 1679 if (fromsnap) {
1680 1680 VERIFY(0 == nvlist_add_string(hdrnv,
1681 1681 "fromsnap", fromsnap));
1682 1682 }
1683 1683 VERIFY(0 == nvlist_add_string(hdrnv, "tosnap", tosnap));
1684 1684 if (!flags->replicate) {
1685 1685 VERIFY(0 == nvlist_add_boolean(hdrnv,
1686 1686 "not_recursive"));
1687 1687 }
1688 1688
1689 1689 err = gather_nvlist(zhp->zfs_hdl, zhp->zfs_name,
1690 1690 fromsnap, tosnap, flags->replicate, &fss, &fsavl);
1691 1691 if (err)
1692 1692 goto err_out;
1693 1693 VERIFY(0 == nvlist_add_nvlist(hdrnv, "fss", fss));
1694 1694 err = nvlist_pack(hdrnv, &packbuf, &buflen,
1695 1695 NV_ENCODE_XDR, 0);
1696 1696 if (debugnvp)
1697 1697 *debugnvp = hdrnv;
1698 1698 else
1699 1699 nvlist_free(hdrnv);
1700 1700 if (err)
1701 1701 goto stderr_out;
1702 1702 }
1703 1703
1704 1704 if (!flags->dryrun) {
1705 1705 /* write first begin record */
1706 1706 drr.drr_type = DRR_BEGIN;
1707 1707 drr.drr_u.drr_begin.drr_magic = DMU_BACKUP_MAGIC;
1708 1708 DMU_SET_STREAM_HDRTYPE(drr.drr_u.drr_begin.
1709 1709 drr_versioninfo, DMU_COMPOUNDSTREAM);
1710 1710 DMU_SET_FEATUREFLAGS(drr.drr_u.drr_begin.
1711 1711 drr_versioninfo, featureflags);
1712 1712 (void) snprintf(drr.drr_u.drr_begin.drr_toname,
1713 1713 sizeof (drr.drr_u.drr_begin.drr_toname),
1714 1714 "%s@%s", zhp->zfs_name, tosnap);
1715 1715 drr.drr_payloadlen = buflen;
1716 1716
1717 1717 err = dump_record(&drr, packbuf, buflen, &zc, outfd);
1718 1718 free(packbuf);
1719 1719 if (err != 0)
1720 1720 goto stderr_out;
1721 1721
1722 1722 /* write end record */
1723 1723 bzero(&drr, sizeof (drr));
1724 1724 drr.drr_type = DRR_END;
1725 1725 drr.drr_u.drr_end.drr_checksum = zc;
1726 1726 err = write(outfd, &drr, sizeof (drr));
1727 1727 if (err == -1) {
1728 1728 err = errno;
1729 1729 goto stderr_out;
1730 1730 }
1731 1731
1732 1732 err = 0;
1733 1733 }
1734 1734 }
1735 1735
1736 1736 /* dump each stream */
1737 1737 sdd.fromsnap = fromsnap;
1738 1738 sdd.tosnap = tosnap;
1739 1739 if (tid != 0)
1740 1740 sdd.outfd = pipefd[0];
1741 1741 else
1742 1742 sdd.outfd = outfd;
1743 1743 sdd.replicate = flags->replicate;
1744 1744 sdd.doall = flags->doall;
1745 1745 sdd.fromorigin = flags->fromorigin;
1746 1746 sdd.fss = fss;
1747 1747 sdd.fsavl = fsavl;
1748 1748 sdd.verbose = flags->verbose;
1749 1749 sdd.parsable = flags->parsable;
1750 1750 sdd.progress = flags->progress;
1751 1751 sdd.dryrun = flags->dryrun;
1752 1752 sdd.large_block = flags->largeblock;
1753 1753 sdd.embed_data = flags->embed_data;
1754 1754 sdd.filter_cb = filter_func;
1755 1755 sdd.filter_cb_arg = cb_arg;
1756 1756 if (debugnvp)
1757 1757 sdd.debugnv = *debugnvp;
1758 1758 if (sdd.verbose && sdd.dryrun)
1759 1759 sdd.std_out = B_TRUE;
1760 1760 fout = sdd.std_out ? stdout : stderr;
1761 1761
1762 1762 /*
1763 1763 * Some flags require that we place user holds on the datasets that are
1764 1764 * being sent so they don't get destroyed during the send. We can skip
1765 1765 * this step if the pool is imported read-only since the datasets cannot
1766 1766 * be destroyed.
1767 1767 */
1768 1768 if (!flags->dryrun && !zpool_get_prop_int(zfs_get_pool_handle(zhp),
1769 1769 ZPOOL_PROP_READONLY, NULL) &&
1770 1770 zfs_spa_version(zhp, &spa_version) == 0 &&
1771 1771 spa_version >= SPA_VERSION_USERREFS &&
1772 1772 (flags->doall || flags->replicate)) {
1773 1773 ++holdseq;
1774 1774 (void) snprintf(sdd.holdtag, sizeof (sdd.holdtag),
1775 1775 ".send-%d-%llu", getpid(), (u_longlong_t)holdseq);
1776 1776 sdd.cleanup_fd = open(ZFS_DEV, O_RDWR|O_EXCL);
1777 1777 if (sdd.cleanup_fd < 0) {
1778 1778 err = errno;
1779 1779 goto stderr_out;
1780 1780 }
1781 1781 sdd.snapholds = fnvlist_alloc();
1782 1782 } else {
1783 1783 sdd.cleanup_fd = -1;
1784 1784 sdd.snapholds = NULL;
1785 1785 }
1786 1786 if (flags->verbose || sdd.snapholds != NULL) {
1787 1787 /*
1788 1788 * Do a verbose no-op dry run to get all the verbose output
1789 1789 * or to gather snapshot hold's before generating any data,
1790 1790 * then do a non-verbose real run to generate the streams.
1791 1791 */
1792 1792 sdd.dryrun = B_TRUE;
1793 1793 err = dump_filesystems(zhp, &sdd);
1794 1794
1795 1795 if (err != 0)
1796 1796 goto stderr_out;
1797 1797
1798 1798 if (flags->verbose) {
1799 1799 if (flags->parsable) {
1800 1800 (void) fprintf(fout, "size\t%llu\n",
1801 1801 (longlong_t)sdd.size);
1802 1802 } else {
1803 1803 char buf[16];
1804 1804 zfs_nicenum(sdd.size, buf, sizeof (buf));
1805 1805 (void) fprintf(fout, dgettext(TEXT_DOMAIN,
1806 1806 "total estimated size is %s\n"), buf);
1807 1807 }
1808 1808 }
1809 1809
1810 1810 /* Ensure no snaps found is treated as an error. */
1811 1811 if (!sdd.seento) {
1812 1812 err = ENOENT;
1813 1813 goto err_out;
1814 1814 }
1815 1815
1816 1816 /* Skip the second run if dryrun was requested. */
1817 1817 if (flags->dryrun)
1818 1818 goto err_out;
1819 1819
1820 1820 if (sdd.snapholds != NULL) {
1821 1821 err = zfs_hold_nvl(zhp, sdd.cleanup_fd, sdd.snapholds);
1822 1822 if (err != 0)
1823 1823 goto stderr_out;
1824 1824
1825 1825 fnvlist_free(sdd.snapholds);
1826 1826 sdd.snapholds = NULL;
1827 1827 }
1828 1828
1829 1829 sdd.dryrun = B_FALSE;
1830 1830 sdd.verbose = B_FALSE;
1831 1831 }
1832 1832
1833 1833 err = dump_filesystems(zhp, &sdd);
1834 1834 fsavl_destroy(fsavl);
1835 1835 nvlist_free(fss);
1836 1836
1837 1837 /* Ensure no snaps found is treated as an error. */
1838 1838 if (err == 0 && !sdd.seento)
1839 1839 err = ENOENT;
1840 1840
1841 1841 if (tid != 0) {
1842 1842 if (err != 0)
1843 1843 (void) pthread_cancel(tid);
1844 1844 (void) close(pipefd[0]);
1845 1845 (void) pthread_join(tid, NULL);
1846 1846 }
1847 1847
1848 1848 if (sdd.cleanup_fd != -1) {
1849 1849 VERIFY(0 == close(sdd.cleanup_fd));
1850 1850 sdd.cleanup_fd = -1;
1851 1851 }
1852 1852
1853 1853 if (!flags->dryrun && (flags->replicate || flags->doall ||
1854 1854 flags->props)) {
1855 1855 /*
1856 1856 * write final end record. NB: want to do this even if
1857 1857 * there was some error, because it might not be totally
1858 1858 * failed.
1859 1859 */
1860 1860 dmu_replay_record_t drr = { 0 };
1861 1861 drr.drr_type = DRR_END;
1862 1862 if (write(outfd, &drr, sizeof (drr)) == -1) {
1863 1863 return (zfs_standard_error(zhp->zfs_hdl,
1864 1864 errno, errbuf));
1865 1865 }
1866 1866 }
1867 1867
1868 1868 return (err || sdd.err);
1869 1869
1870 1870 stderr_out:
1871 1871 err = zfs_standard_error(zhp->zfs_hdl, err, errbuf);
1872 1872 err_out:
1873 1873 fsavl_destroy(fsavl);
1874 1874 nvlist_free(fss);
1875 1875 fnvlist_free(sdd.snapholds);
1876 1876
1877 1877 if (sdd.cleanup_fd != -1)
1878 1878 VERIFY(0 == close(sdd.cleanup_fd));
1879 1879 if (tid != 0) {
1880 1880 (void) pthread_cancel(tid);
1881 1881 (void) close(pipefd[0]);
1882 1882 (void) pthread_join(tid, NULL);
1883 1883 }
1884 1884 return (err);
1885 1885 }
1886 1886
1887 1887 int
1888 1888 zfs_send_one(zfs_handle_t *zhp, const char *from, int fd,
1889 1889 enum lzc_send_flags flags)
1890 1890 {
1891 1891 int err;
1892 1892 libzfs_handle_t *hdl = zhp->zfs_hdl;
1893 1893
1894 1894 char errbuf[1024];
1895 1895 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
1896 1896 "warning: cannot send '%s'"), zhp->zfs_name);
1897 1897
1898 1898 err = lzc_send(zhp->zfs_name, from, fd, flags);
1899 1899 if (err != 0) {
1900 1900 switch (errno) {
1901 1901 case EXDEV:
1902 1902 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1903 1903 "not an earlier snapshot from the same fs"));
1904 1904 return (zfs_error(hdl, EZFS_CROSSTARGET, errbuf));
1905 1905
1906 1906 case ENOENT:
1907 1907 case ESRCH:
1908 1908 if (lzc_exists(zhp->zfs_name)) {
1909 1909 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1910 1910 "incremental source (%s) does not exist"),
1911 1911 from);
1912 1912 }
1913 1913 return (zfs_error(hdl, EZFS_NOENT, errbuf));
1914 1914
1915 1915 case EBUSY:
1916 1916 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1917 1917 "target is busy; if a filesystem, "
1918 1918 "it must not be mounted"));
1919 1919 return (zfs_error(hdl, EZFS_BUSY, errbuf));
1920 1920
1921 1921 case EDQUOT:
1922 1922 case EFBIG:
1923 1923 case EIO:
1924 1924 case ENOLINK:
1925 1925 case ENOSPC:
1926 1926 case ENOSTR:
1927 1927 case ENXIO:
1928 1928 case EPIPE:
1929 1929 case ERANGE:
1930 1930 case EFAULT:
1931 1931 case EROFS:
1932 1932 zfs_error_aux(hdl, strerror(errno));
1933 1933 return (zfs_error(hdl, EZFS_BADBACKUP, errbuf));
1934 1934
1935 1935 default:
1936 1936 return (zfs_standard_error(hdl, errno, errbuf));
1937 1937 }
1938 1938 }
1939 1939 return (err != 0);
1940 1940 }
1941 1941
1942 1942 /*
1943 1943 * Routines specific to "zfs recv"
1944 1944 */
1945 1945
1946 1946 static int
1947 1947 recv_read(libzfs_handle_t *hdl, int fd, void *buf, int ilen,
1948 1948 boolean_t byteswap, zio_cksum_t *zc)
1949 1949 {
1950 1950 char *cp = buf;
1951 1951 int rv;
1952 1952 int len = ilen;
1953 1953
1954 1954 assert(ilen <= SPA_MAXBLOCKSIZE);
1955 1955
1956 1956 do {
1957 1957 rv = read(fd, cp, len);
1958 1958 cp += rv;
1959 1959 len -= rv;
1960 1960 } while (rv > 0);
1961 1961
1962 1962 if (rv < 0 || len != 0) {
1963 1963 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1964 1964 "failed to read from stream"));
1965 1965 return (zfs_error(hdl, EZFS_BADSTREAM, dgettext(TEXT_DOMAIN,
1966 1966 "cannot receive")));
1967 1967 }
1968 1968
1969 1969 if (zc) {
1970 1970 if (byteswap)
1971 1971 fletcher_4_incremental_byteswap(buf, ilen, zc);
1972 1972 else
1973 1973 fletcher_4_incremental_native(buf, ilen, zc);
1974 1974 }
1975 1975 return (0);
1976 1976 }
1977 1977
1978 1978 static int
1979 1979 recv_read_nvlist(libzfs_handle_t *hdl, int fd, int len, nvlist_t **nvp,
1980 1980 boolean_t byteswap, zio_cksum_t *zc)
1981 1981 {
1982 1982 char *buf;
1983 1983 int err;
1984 1984
1985 1985 buf = zfs_alloc(hdl, len);
1986 1986 if (buf == NULL)
1987 1987 return (ENOMEM);
1988 1988
1989 1989 err = recv_read(hdl, fd, buf, len, byteswap, zc);
1990 1990 if (err != 0) {
1991 1991 free(buf);
1992 1992 return (err);
1993 1993 }
1994 1994
1995 1995 err = nvlist_unpack(buf, len, nvp, 0);
1996 1996 free(buf);
1997 1997 if (err != 0) {
1998 1998 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "invalid "
1999 1999 "stream (malformed nvlist)"));
2000 2000 return (EINVAL);
2001 2001 }
2002 2002 return (0);
2003 2003 }
2004 2004
2005 2005 static int
2006 2006 recv_rename(libzfs_handle_t *hdl, const char *name, const char *tryname,
2007 2007 int baselen, char *newname, recvflags_t *flags)
2008 2008 {
2009 2009 static int seq;
2010 2010 zfs_cmd_t zc = { 0 };
2011 2011 int err;
2012 2012 prop_changelist_t *clp;
2013 2013 zfs_handle_t *zhp;
2014 2014
2015 2015 zhp = zfs_open(hdl, name, ZFS_TYPE_DATASET);
2016 2016 if (zhp == NULL)
2017 2017 return (-1);
2018 2018 clp = changelist_gather(zhp, ZFS_PROP_NAME, 0,
2019 2019 flags->force ? MS_FORCE : 0);
2020 2020 zfs_close(zhp);
2021 2021 if (clp == NULL)
2022 2022 return (-1);
2023 2023 err = changelist_prefix(clp);
2024 2024 if (err)
2025 2025 return (err);
2026 2026
2027 2027 zc.zc_objset_type = DMU_OST_ZFS;
2028 2028 (void) strlcpy(zc.zc_name, name, sizeof (zc.zc_name));
2029 2029
2030 2030 if (tryname) {
2031 2031 (void) strcpy(newname, tryname);
2032 2032
2033 2033 (void) strlcpy(zc.zc_value, tryname, sizeof (zc.zc_value));
2034 2034
2035 2035 if (flags->verbose) {
2036 2036 (void) printf("attempting rename %s to %s\n",
2037 2037 zc.zc_name, zc.zc_value);
2038 2038 }
2039 2039 err = ioctl(hdl->libzfs_fd, ZFS_IOC_RENAME, &zc);
2040 2040 if (err == 0)
2041 2041 changelist_rename(clp, name, tryname);
2042 2042 } else {
2043 2043 err = ENOENT;
2044 2044 }
2045 2045
2046 2046 if (err != 0 && strncmp(name + baselen, "recv-", 5) != 0) {
2047 2047 seq++;
2048 2048
2049 2049 (void) snprintf(newname, ZFS_MAXNAMELEN, "%.*srecv-%u-%u",
2050 2050 baselen, name, getpid(), seq);
2051 2051 (void) strlcpy(zc.zc_value, newname, sizeof (zc.zc_value));
2052 2052
2053 2053 if (flags->verbose) {
2054 2054 (void) printf("failed - trying rename %s to %s\n",
2055 2055 zc.zc_name, zc.zc_value);
2056 2056 }
2057 2057 err = ioctl(hdl->libzfs_fd, ZFS_IOC_RENAME, &zc);
2058 2058 if (err == 0)
2059 2059 changelist_rename(clp, name, newname);
2060 2060 if (err && flags->verbose) {
2061 2061 (void) printf("failed (%u) - "
2062 2062 "will try again on next pass\n", errno);
2063 2063 }
2064 2064 err = EAGAIN;
2065 2065 } else if (flags->verbose) {
2066 2066 if (err == 0)
2067 2067 (void) printf("success\n");
2068 2068 else
2069 2069 (void) printf("failed (%u)\n", errno);
2070 2070 }
2071 2071
2072 2072 (void) changelist_postfix(clp);
2073 2073 changelist_free(clp);
2074 2074
2075 2075 return (err);
2076 2076 }
2077 2077
2078 2078 static int
2079 2079 recv_destroy(libzfs_handle_t *hdl, const char *name, int baselen,
2080 2080 char *newname, recvflags_t *flags)
2081 2081 {
2082 2082 zfs_cmd_t zc = { 0 };
2083 2083 int err = 0;
2084 2084 prop_changelist_t *clp;
2085 2085 zfs_handle_t *zhp;
2086 2086 boolean_t defer = B_FALSE;
2087 2087 int spa_version;
2088 2088
2089 2089 zhp = zfs_open(hdl, name, ZFS_TYPE_DATASET);
2090 2090 if (zhp == NULL)
2091 2091 return (-1);
2092 2092 clp = changelist_gather(zhp, ZFS_PROP_NAME, 0,
2093 2093 flags->force ? MS_FORCE : 0);
2094 2094 if (zfs_get_type(zhp) == ZFS_TYPE_SNAPSHOT &&
2095 2095 zfs_spa_version(zhp, &spa_version) == 0 &&
2096 2096 spa_version >= SPA_VERSION_USERREFS)
2097 2097 defer = B_TRUE;
2098 2098 zfs_close(zhp);
2099 2099 if (clp == NULL)
2100 2100 return (-1);
2101 2101 err = changelist_prefix(clp);
2102 2102 if (err)
2103 2103 return (err);
2104 2104
2105 2105 zc.zc_objset_type = DMU_OST_ZFS;
2106 2106 zc.zc_defer_destroy = defer;
2107 2107 (void) strlcpy(zc.zc_name, name, sizeof (zc.zc_name));
2108 2108
2109 2109 if (flags->verbose)
2110 2110 (void) printf("attempting destroy %s\n", zc.zc_name);
2111 2111 err = ioctl(hdl->libzfs_fd, ZFS_IOC_DESTROY, &zc);
2112 2112 if (err == 0) {
2113 2113 if (flags->verbose)
2114 2114 (void) printf("success\n");
2115 2115 changelist_remove(clp, zc.zc_name);
2116 2116 }
2117 2117
2118 2118 (void) changelist_postfix(clp);
2119 2119 changelist_free(clp);
2120 2120
2121 2121 /*
2122 2122 * Deferred destroy might destroy the snapshot or only mark it to be
2123 2123 * destroyed later, and it returns success in either case.
2124 2124 */
2125 2125 if (err != 0 || (defer && zfs_dataset_exists(hdl, name,
2126 2126 ZFS_TYPE_SNAPSHOT))) {
2127 2127 err = recv_rename(hdl, name, NULL, baselen, newname, flags);
2128 2128 }
2129 2129
2130 2130 return (err);
2131 2131 }
2132 2132
2133 2133 typedef struct guid_to_name_data {
2134 2134 uint64_t guid;
2135 2135 boolean_t bookmark_ok;
2136 2136 char *name;
2137 2137 char *skip;
2138 2138 } guid_to_name_data_t;
2139 2139
2140 2140 static int
2141 2141 guid_to_name_cb(zfs_handle_t *zhp, void *arg)
2142 2142 {
2143 2143 guid_to_name_data_t *gtnd = arg;
2144 2144 const char *slash;
2145 2145 int err;
2146 2146
2147 2147 if (gtnd->skip != NULL &&
2148 2148 (slash = strrchr(zhp->zfs_name, '/')) != NULL &&
2149 2149 strcmp(slash + 1, gtnd->skip) == 0) {
2150 2150 zfs_close(zhp);
2151 2151 return (0);
2152 2152 }
2153 2153
2154 2154 if (zfs_prop_get_int(zhp, ZFS_PROP_GUID) == gtnd->guid) {
2155 2155 (void) strcpy(gtnd->name, zhp->zfs_name);
2156 2156 zfs_close(zhp);
2157 2157 return (EEXIST);
2158 2158 }
2159 2159
2160 2160 err = zfs_iter_children(zhp, guid_to_name_cb, gtnd);
2161 2161 if (err != EEXIST && gtnd->bookmark_ok)
2162 2162 err = zfs_iter_bookmarks(zhp, guid_to_name_cb, gtnd);
2163 2163 zfs_close(zhp);
2164 2164 return (err);
2165 2165 }
2166 2166
2167 2167 /*
2168 2168 * Attempt to find the local dataset associated with this guid. In the case of
2169 2169 * multiple matches, we attempt to find the "best" match by searching
2170 2170 * progressively larger portions of the hierarchy. This allows one to send a
2171 2171 * tree of datasets individually and guarantee that we will find the source
2172 2172 * guid within that hierarchy, even if there are multiple matches elsewhere.
2173 2173 */
2174 2174 static int
2175 2175 guid_to_name(libzfs_handle_t *hdl, const char *parent, uint64_t guid,
2176 2176 boolean_t bookmark_ok, char *name)
2177 2177 {
2178 2178 char pname[ZFS_MAXNAMELEN];
2179 2179 guid_to_name_data_t gtnd;
2180 2180
2181 2181 gtnd.guid = guid;
2182 2182 gtnd.bookmark_ok = bookmark_ok;
2183 2183 gtnd.name = name;
2184 2184 gtnd.skip = NULL;
2185 2185
2186 2186 /*
2187 2187 * Search progressively larger portions of the hierarchy, starting
2188 2188 * with the filesystem specified by 'parent'. This will
2189 2189 * select the "most local" version of the origin snapshot in the case
2190 2190 * that there are multiple matching snapshots in the system.
2191 2191 */
2192 2192 (void) strlcpy(pname, parent, sizeof (pname));
2193 2193 char *cp = strrchr(pname, '@');
2194 2194 if (cp == NULL)
2195 2195 cp = strchr(pname, '\0');
2196 2196 for (; cp != NULL; cp = strrchr(pname, '/')) {
2197 2197 /* Chop off the last component and open the parent */
2198 2198 *cp = '\0';
2199 2199 zfs_handle_t *zhp = make_dataset_handle(hdl, pname);
2200 2200
2201 2201 if (zhp == NULL)
2202 2202 continue;
2203 2203 int err = guid_to_name_cb(zfs_handle_dup(zhp), >nd);
2204 2204 if (err != EEXIST)
2205 2205 err = zfs_iter_children(zhp, guid_to_name_cb, >nd);
2206 2206 if (err != EEXIST && bookmark_ok)
2207 2207 err = zfs_iter_bookmarks(zhp, guid_to_name_cb, >nd);
2208 2208 zfs_close(zhp);
2209 2209 if (err == EEXIST)
2210 2210 return (0);
2211 2211
2212 2212 /*
2213 2213 * Remember the last portion of the dataset so we skip it next
2214 2214 * time through (as we've already searched that portion of the
2215 2215 * hierarchy).
2216 2216 */
2217 2217 gtnd.skip = strrchr(pname, '/') + 1;
2218 2218 }
2219 2219
2220 2220 return (ENOENT);
2221 2221 }
2222 2222
2223 2223 /*
2224 2224 * Return +1 if guid1 is before guid2, 0 if they are the same, and -1 if
2225 2225 * guid1 is after guid2.
2226 2226 */
2227 2227 static int
2228 2228 created_before(libzfs_handle_t *hdl, avl_tree_t *avl,
2229 2229 uint64_t guid1, uint64_t guid2)
2230 2230 {
2231 2231 nvlist_t *nvfs;
2232 2232 char *fsname, *snapname;
2233 2233 char buf[ZFS_MAXNAMELEN];
2234 2234 int rv;
2235 2235 zfs_handle_t *guid1hdl, *guid2hdl;
2236 2236 uint64_t create1, create2;
2237 2237
2238 2238 if (guid2 == 0)
2239 2239 return (0);
2240 2240 if (guid1 == 0)
2241 2241 return (1);
2242 2242
2243 2243 nvfs = fsavl_find(avl, guid1, &snapname);
2244 2244 VERIFY(0 == nvlist_lookup_string(nvfs, "name", &fsname));
2245 2245 (void) snprintf(buf, sizeof (buf), "%s@%s", fsname, snapname);
2246 2246 guid1hdl = zfs_open(hdl, buf, ZFS_TYPE_SNAPSHOT);
2247 2247 if (guid1hdl == NULL)
2248 2248 return (-1);
2249 2249
2250 2250 nvfs = fsavl_find(avl, guid2, &snapname);
2251 2251 VERIFY(0 == nvlist_lookup_string(nvfs, "name", &fsname));
2252 2252 (void) snprintf(buf, sizeof (buf), "%s@%s", fsname, snapname);
2253 2253 guid2hdl = zfs_open(hdl, buf, ZFS_TYPE_SNAPSHOT);
2254 2254 if (guid2hdl == NULL) {
2255 2255 zfs_close(guid1hdl);
2256 2256 return (-1);
2257 2257 }
2258 2258
2259 2259 create1 = zfs_prop_get_int(guid1hdl, ZFS_PROP_CREATETXG);
2260 2260 create2 = zfs_prop_get_int(guid2hdl, ZFS_PROP_CREATETXG);
2261 2261
2262 2262 if (create1 < create2)
2263 2263 rv = -1;
2264 2264 else if (create1 > create2)
2265 2265 rv = +1;
2266 2266 else
2267 2267 rv = 0;
2268 2268
2269 2269 zfs_close(guid1hdl);
2270 2270 zfs_close(guid2hdl);
2271 2271
2272 2272 return (rv);
2273 2273 }
2274 2274
2275 2275 static int
2276 2276 recv_incremental_replication(libzfs_handle_t *hdl, const char *tofs,
2277 2277 recvflags_t *flags, nvlist_t *stream_nv, avl_tree_t *stream_avl,
2278 2278 nvlist_t *renamed)
2279 2279 {
2280 2280 nvlist_t *local_nv;
2281 2281 avl_tree_t *local_avl;
2282 2282 nvpair_t *fselem, *nextfselem;
2283 2283 char *fromsnap;
2284 2284 char newname[ZFS_MAXNAMELEN];
2285 2285 int error;
2286 2286 boolean_t needagain, progress, recursive;
2287 2287 char *s1, *s2;
2288 2288
2289 2289 VERIFY(0 == nvlist_lookup_string(stream_nv, "fromsnap", &fromsnap));
2290 2290
2291 2291 recursive = (nvlist_lookup_boolean(stream_nv, "not_recursive") ==
2292 2292 ENOENT);
2293 2293
2294 2294 if (flags->dryrun)
2295 2295 return (0);
2296 2296
2297 2297 again:
2298 2298 needagain = progress = B_FALSE;
2299 2299
2300 2300 if ((error = gather_nvlist(hdl, tofs, fromsnap, NULL,
2301 2301 recursive, &local_nv, &local_avl)) != 0)
2302 2302 return (error);
2303 2303
2304 2304 /*
2305 2305 * Process deletes and renames
2306 2306 */
2307 2307 for (fselem = nvlist_next_nvpair(local_nv, NULL);
2308 2308 fselem; fselem = nextfselem) {
2309 2309 nvlist_t *nvfs, *snaps;
2310 2310 nvlist_t *stream_nvfs = NULL;
2311 2311 nvpair_t *snapelem, *nextsnapelem;
2312 2312 uint64_t fromguid = 0;
2313 2313 uint64_t originguid = 0;
2314 2314 uint64_t stream_originguid = 0;
2315 2315 uint64_t parent_fromsnap_guid, stream_parent_fromsnap_guid;
2316 2316 char *fsname, *stream_fsname;
2317 2317
2318 2318 nextfselem = nvlist_next_nvpair(local_nv, fselem);
2319 2319
2320 2320 VERIFY(0 == nvpair_value_nvlist(fselem, &nvfs));
2321 2321 VERIFY(0 == nvlist_lookup_nvlist(nvfs, "snaps", &snaps));
2322 2322 VERIFY(0 == nvlist_lookup_string(nvfs, "name", &fsname));
2323 2323 VERIFY(0 == nvlist_lookup_uint64(nvfs, "parentfromsnap",
2324 2324 &parent_fromsnap_guid));
2325 2325 (void) nvlist_lookup_uint64(nvfs, "origin", &originguid);
2326 2326
2327 2327 /*
2328 2328 * First find the stream's fs, so we can check for
2329 2329 * a different origin (due to "zfs promote")
2330 2330 */
2331 2331 for (snapelem = nvlist_next_nvpair(snaps, NULL);
2332 2332 snapelem; snapelem = nvlist_next_nvpair(snaps, snapelem)) {
2333 2333 uint64_t thisguid;
2334 2334
2335 2335 VERIFY(0 == nvpair_value_uint64(snapelem, &thisguid));
2336 2336 stream_nvfs = fsavl_find(stream_avl, thisguid, NULL);
2337 2337
2338 2338 if (stream_nvfs != NULL)
2339 2339 break;
2340 2340 }
2341 2341
2342 2342 /* check for promote */
2343 2343 (void) nvlist_lookup_uint64(stream_nvfs, "origin",
2344 2344 &stream_originguid);
2345 2345 if (stream_nvfs && originguid != stream_originguid) {
2346 2346 switch (created_before(hdl, local_avl,
2347 2347 stream_originguid, originguid)) {
2348 2348 case 1: {
2349 2349 /* promote it! */
2350 2350 zfs_cmd_t zc = { 0 };
2351 2351 nvlist_t *origin_nvfs;
2352 2352 char *origin_fsname;
2353 2353
2354 2354 if (flags->verbose)
2355 2355 (void) printf("promoting %s\n", fsname);
2356 2356
2357 2357 origin_nvfs = fsavl_find(local_avl, originguid,
2358 2358 NULL);
2359 2359 VERIFY(0 == nvlist_lookup_string(origin_nvfs,
2360 2360 "name", &origin_fsname));
2361 2361 (void) strlcpy(zc.zc_value, origin_fsname,
2362 2362 sizeof (zc.zc_value));
2363 2363 (void) strlcpy(zc.zc_name, fsname,
2364 2364 sizeof (zc.zc_name));
2365 2365 error = zfs_ioctl(hdl, ZFS_IOC_PROMOTE, &zc);
2366 2366 if (error == 0)
2367 2367 progress = B_TRUE;
2368 2368 break;
2369 2369 }
2370 2370 default:
2371 2371 break;
2372 2372 case -1:
2373 2373 fsavl_destroy(local_avl);
2374 2374 nvlist_free(local_nv);
2375 2375 return (-1);
2376 2376 }
2377 2377 /*
2378 2378 * We had/have the wrong origin, therefore our
2379 2379 * list of snapshots is wrong. Need to handle
2380 2380 * them on the next pass.
2381 2381 */
2382 2382 needagain = B_TRUE;
2383 2383 continue;
2384 2384 }
2385 2385
2386 2386 for (snapelem = nvlist_next_nvpair(snaps, NULL);
2387 2387 snapelem; snapelem = nextsnapelem) {
2388 2388 uint64_t thisguid;
2389 2389 char *stream_snapname;
2390 2390 nvlist_t *found, *props;
2391 2391
2392 2392 nextsnapelem = nvlist_next_nvpair(snaps, snapelem);
2393 2393
2394 2394 VERIFY(0 == nvpair_value_uint64(snapelem, &thisguid));
2395 2395 found = fsavl_find(stream_avl, thisguid,
2396 2396 &stream_snapname);
2397 2397
2398 2398 /* check for delete */
2399 2399 if (found == NULL) {
2400 2400 char name[ZFS_MAXNAMELEN];
2401 2401
2402 2402 if (!flags->force)
2403 2403 continue;
2404 2404
2405 2405 (void) snprintf(name, sizeof (name), "%s@%s",
2406 2406 fsname, nvpair_name(snapelem));
2407 2407
2408 2408 error = recv_destroy(hdl, name,
2409 2409 strlen(fsname)+1, newname, flags);
2410 2410 if (error)
2411 2411 needagain = B_TRUE;
2412 2412 else
2413 2413 progress = B_TRUE;
2414 2414 continue;
2415 2415 }
2416 2416
2417 2417 stream_nvfs = found;
2418 2418
2419 2419 if (0 == nvlist_lookup_nvlist(stream_nvfs, "snapprops",
2420 2420 &props) && 0 == nvlist_lookup_nvlist(props,
2421 2421 stream_snapname, &props)) {
2422 2422 zfs_cmd_t zc = { 0 };
2423 2423
2424 2424 zc.zc_cookie = B_TRUE; /* received */
2425 2425 (void) snprintf(zc.zc_name, sizeof (zc.zc_name),
2426 2426 "%s@%s", fsname, nvpair_name(snapelem));
2427 2427 if (zcmd_write_src_nvlist(hdl, &zc,
2428 2428 props) == 0) {
2429 2429 (void) zfs_ioctl(hdl,
2430 2430 ZFS_IOC_SET_PROP, &zc);
2431 2431 zcmd_free_nvlists(&zc);
2432 2432 }
2433 2433 }
2434 2434
2435 2435 /* check for different snapname */
2436 2436 if (strcmp(nvpair_name(snapelem),
2437 2437 stream_snapname) != 0) {
2438 2438 char name[ZFS_MAXNAMELEN];
2439 2439 char tryname[ZFS_MAXNAMELEN];
2440 2440
2441 2441 (void) snprintf(name, sizeof (name), "%s@%s",
2442 2442 fsname, nvpair_name(snapelem));
2443 2443 (void) snprintf(tryname, sizeof (name), "%s@%s",
2444 2444 fsname, stream_snapname);
2445 2445
2446 2446 error = recv_rename(hdl, name, tryname,
2447 2447 strlen(fsname)+1, newname, flags);
2448 2448 if (error)
2449 2449 needagain = B_TRUE;
2450 2450 else
2451 2451 progress = B_TRUE;
2452 2452 }
2453 2453
2454 2454 if (strcmp(stream_snapname, fromsnap) == 0)
2455 2455 fromguid = thisguid;
2456 2456 }
2457 2457
2458 2458 /* check for delete */
2459 2459 if (stream_nvfs == NULL) {
2460 2460 if (!flags->force)
2461 2461 continue;
2462 2462
2463 2463 error = recv_destroy(hdl, fsname, strlen(tofs)+1,
2464 2464 newname, flags);
2465 2465 if (error)
2466 2466 needagain = B_TRUE;
2467 2467 else
2468 2468 progress = B_TRUE;
2469 2469 continue;
2470 2470 }
2471 2471
2472 2472 if (fromguid == 0) {
2473 2473 if (flags->verbose) {
2474 2474 (void) printf("local fs %s does not have "
2475 2475 "fromsnap (%s in stream); must have "
2476 2476 "been deleted locally; ignoring\n",
2477 2477 fsname, fromsnap);
2478 2478 }
2479 2479 continue;
2480 2480 }
2481 2481
2482 2482 VERIFY(0 == nvlist_lookup_string(stream_nvfs,
2483 2483 "name", &stream_fsname));
2484 2484 VERIFY(0 == nvlist_lookup_uint64(stream_nvfs,
2485 2485 "parentfromsnap", &stream_parent_fromsnap_guid));
2486 2486
2487 2487 s1 = strrchr(fsname, '/');
2488 2488 s2 = strrchr(stream_fsname, '/');
2489 2489
2490 2490 /*
2491 2491 * Check for rename. If the exact receive path is specified, it
2492 2492 * does not count as a rename, but we still need to check the
2493 2493 * datasets beneath it.
2494 2494 */
2495 2495 if ((stream_parent_fromsnap_guid != 0 &&
2496 2496 parent_fromsnap_guid != 0 &&
2497 2497 stream_parent_fromsnap_guid != parent_fromsnap_guid) ||
2498 2498 ((flags->isprefix || strcmp(tofs, fsname) != 0) &&
2499 2499 (s1 != NULL) && (s2 != NULL) && strcmp(s1, s2) != 0)) {
2500 2500 nvlist_t *parent;
2501 2501 char tryname[ZFS_MAXNAMELEN];
2502 2502
2503 2503 parent = fsavl_find(local_avl,
2504 2504 stream_parent_fromsnap_guid, NULL);
2505 2505 /*
2506 2506 * NB: parent might not be found if we used the
2507 2507 * tosnap for stream_parent_fromsnap_guid,
2508 2508 * because the parent is a newly-created fs;
2509 2509 * we'll be able to rename it after we recv the
2510 2510 * new fs.
2511 2511 */
2512 2512 if (parent != NULL) {
2513 2513 char *pname;
2514 2514
2515 2515 VERIFY(0 == nvlist_lookup_string(parent, "name",
2516 2516 &pname));
2517 2517 (void) snprintf(tryname, sizeof (tryname),
2518 2518 "%s%s", pname, strrchr(stream_fsname, '/'));
2519 2519 } else {
2520 2520 tryname[0] = '\0';
2521 2521 if (flags->verbose) {
2522 2522 (void) printf("local fs %s new parent "
2523 2523 "not found\n", fsname);
2524 2524 }
2525 2525 }
2526 2526
2527 2527 newname[0] = '\0';
2528 2528
2529 2529 error = recv_rename(hdl, fsname, tryname,
2530 2530 strlen(tofs)+1, newname, flags);
2531 2531
2532 2532 if (renamed != NULL && newname[0] != '\0') {
2533 2533 VERIFY(0 == nvlist_add_boolean(renamed,
2534 2534 newname));
2535 2535 }
2536 2536
2537 2537 if (error)
2538 2538 needagain = B_TRUE;
2539 2539 else
2540 2540 progress = B_TRUE;
2541 2541 }
2542 2542 }
2543 2543
2544 2544 fsavl_destroy(local_avl);
2545 2545 nvlist_free(local_nv);
2546 2546
2547 2547 if (needagain && progress) {
2548 2548 /* do another pass to fix up temporary names */
2549 2549 if (flags->verbose)
2550 2550 (void) printf("another pass:\n");
2551 2551 goto again;
2552 2552 }
2553 2553
2554 2554 return (needagain);
2555 2555 }
2556 2556
2557 2557 static int
2558 2558 zfs_receive_package(libzfs_handle_t *hdl, int fd, const char *destname,
2559 2559 recvflags_t *flags, dmu_replay_record_t *drr, zio_cksum_t *zc,
2560 2560 char **top_zfs, int cleanup_fd, uint64_t *action_handlep)
2561 2561 {
2562 2562 nvlist_t *stream_nv = NULL;
2563 2563 avl_tree_t *stream_avl = NULL;
2564 2564 char *fromsnap = NULL;
2565 2565 char *sendsnap = NULL;
2566 2566 char *cp;
2567 2567 char tofs[ZFS_MAXNAMELEN];
2568 2568 char sendfs[ZFS_MAXNAMELEN];
2569 2569 char errbuf[1024];
2570 2570 dmu_replay_record_t drre;
2571 2571 int error;
2572 2572 boolean_t anyerr = B_FALSE;
2573 2573 boolean_t softerr = B_FALSE;
2574 2574 boolean_t recursive;
2575 2575
2576 2576 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
2577 2577 "cannot receive"));
2578 2578
2579 2579 assert(drr->drr_type == DRR_BEGIN);
2580 2580 assert(drr->drr_u.drr_begin.drr_magic == DMU_BACKUP_MAGIC);
2581 2581 assert(DMU_GET_STREAM_HDRTYPE(drr->drr_u.drr_begin.drr_versioninfo) ==
2582 2582 DMU_COMPOUNDSTREAM);
2583 2583
2584 2584 /*
2585 2585 * Read in the nvlist from the stream.
2586 2586 */
2587 2587 if (drr->drr_payloadlen != 0) {
2588 2588 error = recv_read_nvlist(hdl, fd, drr->drr_payloadlen,
2589 2589 &stream_nv, flags->byteswap, zc);
2590 2590 if (error) {
2591 2591 error = zfs_error(hdl, EZFS_BADSTREAM, errbuf);
2592 2592 goto out;
2593 2593 }
2594 2594 }
2595 2595
2596 2596 recursive = (nvlist_lookup_boolean(stream_nv, "not_recursive") ==
2597 2597 ENOENT);
2598 2598
2599 2599 if (recursive && strchr(destname, '@')) {
2600 2600 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
2601 2601 "cannot specify snapshot name for multi-snapshot stream"));
2602 2602 error = zfs_error(hdl, EZFS_BADSTREAM, errbuf);
2603 2603 goto out;
2604 2604 }
2605 2605
2606 2606 /*
2607 2607 * Read in the end record and verify checksum.
2608 2608 */
2609 2609 if (0 != (error = recv_read(hdl, fd, &drre, sizeof (drre),
2610 2610 flags->byteswap, NULL)))
2611 2611 goto out;
2612 2612 if (flags->byteswap) {
2613 2613 drre.drr_type = BSWAP_32(drre.drr_type);
2614 2614 drre.drr_u.drr_end.drr_checksum.zc_word[0] =
2615 2615 BSWAP_64(drre.drr_u.drr_end.drr_checksum.zc_word[0]);
2616 2616 drre.drr_u.drr_end.drr_checksum.zc_word[1] =
2617 2617 BSWAP_64(drre.drr_u.drr_end.drr_checksum.zc_word[1]);
2618 2618 drre.drr_u.drr_end.drr_checksum.zc_word[2] =
2619 2619 BSWAP_64(drre.drr_u.drr_end.drr_checksum.zc_word[2]);
2620 2620 drre.drr_u.drr_end.drr_checksum.zc_word[3] =
2621 2621 BSWAP_64(drre.drr_u.drr_end.drr_checksum.zc_word[3]);
2622 2622 }
2623 2623 if (drre.drr_type != DRR_END) {
2624 2624 error = zfs_error(hdl, EZFS_BADSTREAM, errbuf);
2625 2625 goto out;
2626 2626 }
2627 2627 if (!ZIO_CHECKSUM_EQUAL(drre.drr_u.drr_end.drr_checksum, *zc)) {
2628 2628 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
2629 2629 "incorrect header checksum"));
2630 2630 error = zfs_error(hdl, EZFS_BADSTREAM, errbuf);
2631 2631 goto out;
2632 2632 }
2633 2633
2634 2634 (void) nvlist_lookup_string(stream_nv, "fromsnap", &fromsnap);
2635 2635
2636 2636 if (drr->drr_payloadlen != 0) {
2637 2637 nvlist_t *stream_fss;
2638 2638
2639 2639 VERIFY(0 == nvlist_lookup_nvlist(stream_nv, "fss",
2640 2640 &stream_fss));
2641 2641 if ((stream_avl = fsavl_create(stream_fss)) == NULL) {
2642 2642 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
2643 2643 "couldn't allocate avl tree"));
2644 2644 error = zfs_error(hdl, EZFS_NOMEM, errbuf);
2645 2645 goto out;
2646 2646 }
2647 2647
2648 2648 if (fromsnap != NULL) {
2649 2649 nvlist_t *renamed = NULL;
2650 2650 nvpair_t *pair = NULL;
2651 2651
2652 2652 (void) strlcpy(tofs, destname, ZFS_MAXNAMELEN);
2653 2653 if (flags->isprefix) {
2654 2654 struct drr_begin *drrb = &drr->drr_u.drr_begin;
2655 2655 int i;
2656 2656
2657 2657 if (flags->istail) {
2658 2658 cp = strrchr(drrb->drr_toname, '/');
2659 2659 if (cp == NULL) {
2660 2660 (void) strlcat(tofs, "/",
2661 2661 ZFS_MAXNAMELEN);
2662 2662 i = 0;
2663 2663 } else {
2664 2664 i = (cp - drrb->drr_toname);
2665 2665 }
2666 2666 } else {
2667 2667 i = strcspn(drrb->drr_toname, "/@");
2668 2668 }
2669 2669 /* zfs_receive_one() will create_parents() */
2670 2670 (void) strlcat(tofs, &drrb->drr_toname[i],
2671 2671 ZFS_MAXNAMELEN);
2672 2672 *strchr(tofs, '@') = '\0';
2673 2673 }
2674 2674
2675 2675 if (recursive && !flags->dryrun && !flags->nomount) {
2676 2676 VERIFY(0 == nvlist_alloc(&renamed,
2677 2677 NV_UNIQUE_NAME, 0));
2678 2678 }
2679 2679
2680 2680 softerr = recv_incremental_replication(hdl, tofs, flags,
2681 2681 stream_nv, stream_avl, renamed);
2682 2682
2683 2683 /* Unmount renamed filesystems before receiving. */
2684 2684 while ((pair = nvlist_next_nvpair(renamed,
2685 2685 pair)) != NULL) {
2686 2686 zfs_handle_t *zhp;
2687 2687 prop_changelist_t *clp = NULL;
2688 2688
2689 2689 zhp = zfs_open(hdl, nvpair_name(pair),
2690 2690 ZFS_TYPE_FILESYSTEM);
2691 2691 if (zhp != NULL) {
2692 2692 clp = changelist_gather(zhp,
2693 2693 ZFS_PROP_MOUNTPOINT, 0, 0);
2694 2694 zfs_close(zhp);
2695 2695 if (clp != NULL) {
2696 2696 softerr |=
2697 2697 changelist_prefix(clp);
2698 2698 changelist_free(clp);
2699 2699 }
2700 2700 }
2701 2701 }
2702 2702
2703 2703 nvlist_free(renamed);
2704 2704 }
2705 2705 }
2706 2706
2707 2707 /*
|
↓ open down ↓ |
2707 lines elided |
↑ open up ↑ |
2708 2708 * Get the fs specified by the first path in the stream (the top level
2709 2709 * specified by 'zfs send') and pass it to each invocation of
2710 2710 * zfs_receive_one().
2711 2711 */
2712 2712 (void) strlcpy(sendfs, drr->drr_u.drr_begin.drr_toname,
2713 2713 ZFS_MAXNAMELEN);
2714 2714 if ((cp = strchr(sendfs, '@')) != NULL) {
2715 2715 *cp = '\0';
2716 2716 /*
2717 2717 * Find the "sendsnap", the final snapshot in a replication
2718 - * stream, so zfs_receive_one() can set filesystem properties
2719 - * ONLY when receiving that final snapshot.
2718 + * stream. zfs_receive_one() handles certain errors
2719 + * differently, depending on if the contained stream is the
2720 + * last one or not.
2720 2721 */
2721 2722 sendsnap = (cp + 1);
2722 2723 }
2723 2724
2724 2725 /* Finally, receive each contained stream */
2725 2726 do {
2726 2727 /*
2727 2728 * we should figure out if it has a recoverable
2728 2729 * error, in which case do a recv_skip() and drive on.
2729 2730 * Note, if we fail due to already having this guid,
2730 2731 * zfs_receive_one() will take care of it (ie,
2731 2732 * recv_skip() and return 0).
2732 2733 */
2733 2734 error = zfs_receive_impl(hdl, destname, NULL, flags, fd,
2734 2735 sendfs, stream_nv, stream_avl, top_zfs, cleanup_fd,
2735 2736 action_handlep, sendsnap);
2736 2737 if (error == ENODATA) {
2737 2738 error = 0;
2738 2739 break;
2739 2740 }
2740 2741 anyerr |= error;
2741 2742 } while (error == 0);
2742 2743
2743 2744 if (drr->drr_payloadlen != 0 && fromsnap != NULL) {
2744 2745 /*
2745 2746 * Now that we have the fs's they sent us, try the
2746 2747 * renames again.
2747 2748 */
2748 2749 softerr = recv_incremental_replication(hdl, tofs, flags,
2749 2750 stream_nv, stream_avl, NULL);
2750 2751 }
2751 2752
2752 2753 out:
2753 2754 fsavl_destroy(stream_avl);
2754 2755 if (stream_nv)
2755 2756 nvlist_free(stream_nv);
2756 2757 if (softerr)
2757 2758 error = -2;
2758 2759 if (anyerr)
2759 2760 error = -1;
2760 2761 return (error);
2761 2762 }
2762 2763
2763 2764 static void
2764 2765 trunc_prop_errs(int truncated)
2765 2766 {
2766 2767 ASSERT(truncated != 0);
2767 2768
2768 2769 if (truncated == 1)
2769 2770 (void) fprintf(stderr, dgettext(TEXT_DOMAIN,
2770 2771 "1 more property could not be set\n"));
2771 2772 else
2772 2773 (void) fprintf(stderr, dgettext(TEXT_DOMAIN,
2773 2774 "%d more properties could not be set\n"), truncated);
2774 2775 }
2775 2776
2776 2777 static int
2777 2778 recv_skip(libzfs_handle_t *hdl, int fd, boolean_t byteswap)
2778 2779 {
2779 2780 dmu_replay_record_t *drr;
2780 2781 void *buf = zfs_alloc(hdl, SPA_MAXBLOCKSIZE);
2781 2782 char errbuf[1024];
2782 2783
2783 2784 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
2784 2785 "cannot receive:"));
2785 2786
2786 2787 /* XXX would be great to use lseek if possible... */
2787 2788 drr = buf;
2788 2789
2789 2790 while (recv_read(hdl, fd, drr, sizeof (dmu_replay_record_t),
2790 2791 byteswap, NULL) == 0) {
2791 2792 if (byteswap)
2792 2793 drr->drr_type = BSWAP_32(drr->drr_type);
2793 2794
2794 2795 switch (drr->drr_type) {
2795 2796 case DRR_BEGIN:
2796 2797 if (drr->drr_payloadlen != 0) {
2797 2798 (void) recv_read(hdl, fd, buf,
2798 2799 drr->drr_payloadlen, B_FALSE, NULL);
2799 2800 }
2800 2801 break;
2801 2802
2802 2803 case DRR_END:
2803 2804 free(buf);
2804 2805 return (0);
2805 2806
2806 2807 case DRR_OBJECT:
2807 2808 if (byteswap) {
2808 2809 drr->drr_u.drr_object.drr_bonuslen =
2809 2810 BSWAP_32(drr->drr_u.drr_object.
2810 2811 drr_bonuslen);
2811 2812 }
2812 2813 (void) recv_read(hdl, fd, buf,
2813 2814 P2ROUNDUP(drr->drr_u.drr_object.drr_bonuslen, 8),
2814 2815 B_FALSE, NULL);
2815 2816 break;
2816 2817
2817 2818 case DRR_WRITE:
2818 2819 if (byteswap) {
2819 2820 drr->drr_u.drr_write.drr_length =
2820 2821 BSWAP_64(drr->drr_u.drr_write.drr_length);
2821 2822 }
2822 2823 (void) recv_read(hdl, fd, buf,
2823 2824 drr->drr_u.drr_write.drr_length, B_FALSE, NULL);
2824 2825 break;
2825 2826 case DRR_SPILL:
2826 2827 if (byteswap) {
2827 2828 drr->drr_u.drr_write.drr_length =
2828 2829 BSWAP_64(drr->drr_u.drr_spill.drr_length);
2829 2830 }
2830 2831 (void) recv_read(hdl, fd, buf,
2831 2832 drr->drr_u.drr_spill.drr_length, B_FALSE, NULL);
2832 2833 break;
2833 2834 case DRR_WRITE_EMBEDDED:
2834 2835 if (byteswap) {
2835 2836 drr->drr_u.drr_write_embedded.drr_psize =
2836 2837 BSWAP_32(drr->drr_u.drr_write_embedded.
2837 2838 drr_psize);
2838 2839 }
2839 2840 (void) recv_read(hdl, fd, buf,
2840 2841 P2ROUNDUP(drr->drr_u.drr_write_embedded.drr_psize,
2841 2842 8), B_FALSE, NULL);
2842 2843 break;
2843 2844 case DRR_WRITE_BYREF:
2844 2845 case DRR_FREEOBJECTS:
2845 2846 case DRR_FREE:
2846 2847 break;
2847 2848
2848 2849 default:
2849 2850 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
2850 2851 "invalid record type"));
2851 2852 return (zfs_error(hdl, EZFS_BADSTREAM, errbuf));
2852 2853 }
2853 2854 }
2854 2855
2855 2856 free(buf);
2856 2857 return (-1);
2857 2858 }
2858 2859
2859 2860 static void
2860 2861 recv_ecksum_set_aux(libzfs_handle_t *hdl, const char *target_snap,
2861 2862 boolean_t resumable)
2862 2863 {
2863 2864 char target_fs[ZFS_MAXNAMELEN];
2864 2865
2865 2866 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
2866 2867 "checksum mismatch or incomplete stream"));
2867 2868
2868 2869 if (!resumable)
2869 2870 return;
2870 2871 (void) strlcpy(target_fs, target_snap, sizeof (target_fs));
2871 2872 *strchr(target_fs, '@') = '\0';
2872 2873 zfs_handle_t *zhp = zfs_open(hdl, target_fs,
2873 2874 ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME);
2874 2875 if (zhp == NULL)
2875 2876 return;
2876 2877
2877 2878 char token_buf[ZFS_MAXPROPLEN];
2878 2879 int error = zfs_prop_get(zhp, ZFS_PROP_RECEIVE_RESUME_TOKEN,
2879 2880 token_buf, sizeof (token_buf),
2880 2881 NULL, NULL, 0, B_TRUE);
2881 2882 if (error == 0) {
2882 2883 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
2883 2884 "checksum mismatch or incomplete stream.\n"
2884 2885 "Partially received snapshot is saved.\n"
2885 2886 "A resuming stream can be generated on the sending "
2886 2887 "system by running:\n"
2887 2888 " zfs send -t %s"),
2888 2889 token_buf);
2889 2890 }
2890 2891 zfs_close(zhp);
2891 2892 }
2892 2893
2893 2894 /*
2894 2895 * Restores a backup of tosnap from the file descriptor specified by infd.
2895 2896 */
2896 2897 static int
2897 2898 zfs_receive_one(libzfs_handle_t *hdl, int infd, const char *tosnap,
2898 2899 const char *originsnap, recvflags_t *flags, dmu_replay_record_t *drr,
2899 2900 dmu_replay_record_t *drr_noswap, const char *sendfs,
2900 2901 avl_tree_t *stream_avl, char **top_zfs, int cleanup_fd,
2901 2902 uint64_t *action_handlep, const char *finalsnap)
2902 2903 {
2903 2904 zfs_cmd_t zc = { 0 };
2904 2905 time_t begin_time;
2905 2906 int ioctl_err, ioctl_errno, err;
2906 2907 char *cp;
2907 2908 struct drr_begin *drrb = &drr->drr_u.drr_begin;
2908 2909 char errbuf[1024];
2909 2910 char prop_errbuf[1024];
2910 2911 const char *chopprefix;
2911 2912 boolean_t newfs = B_FALSE;
2912 2913 boolean_t stream_wantsnewfs;
2913 2914 uint64_t parent_snapguid = 0;
2914 2915 prop_changelist_t *clp = NULL;
2915 2916 nvlist_t *snapprops_nvlist = NULL;
2916 2917 zprop_errflags_t prop_errflags;
2917 2918 char *snapname = NULL;
2918 2919
2919 2920 begin_time = time(NULL);
2920 2921
2921 2922 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
2922 2923 "cannot receive"));
2923 2924
2924 2925 if (stream_avl != NULL) {
2925 2926 nvlist_t *fs = fsavl_find(stream_avl, drrb->drr_toguid,
2926 2927 &snapname);
2927 2928 nvlist_t *props;
2928 2929 int ret;
2929 2930
2930 2931 (void) nvlist_lookup_uint64(fs, "parentfromsnap",
2931 2932 &parent_snapguid);
2932 2933 err = nvlist_lookup_nvlist(fs, "props", &props);
2933 2934 if (err)
2934 2935 VERIFY(0 == nvlist_alloc(&props, NV_UNIQUE_NAME, 0));
2935 2936
2936 2937 if (flags->canmountoff) {
2937 2938 VERIFY(0 == nvlist_add_uint64(props,
2938 2939 zfs_prop_to_name(ZFS_PROP_CANMOUNT), 0));
2939 2940 }
2940 2941 ret = zcmd_write_src_nvlist(hdl, &zc, props);
2941 2942 if (err)
2942 2943 nvlist_free(props);
2943 2944
2944 2945 if (0 == nvlist_lookup_nvlist(fs, "snapprops", &props)) {
2945 2946 VERIFY(0 == nvlist_lookup_nvlist(props,
2946 2947 snapname, &snapprops_nvlist));
2947 2948 }
2948 2949
2949 2950 if (ret != 0)
2950 2951 return (-1);
2951 2952 }
2952 2953
2953 2954 cp = NULL;
2954 2955
2955 2956 /*
2956 2957 * Determine how much of the snapshot name stored in the stream
2957 2958 * we are going to tack on to the name they specified on the
2958 2959 * command line, and how much we are going to chop off.
2959 2960 *
2960 2961 * If they specified a snapshot, chop the entire name stored in
2961 2962 * the stream.
2962 2963 */
2963 2964 if (flags->istail) {
2964 2965 /*
2965 2966 * A filesystem was specified with -e. We want to tack on only
2966 2967 * the tail of the sent snapshot path.
2967 2968 */
2968 2969 if (strchr(tosnap, '@')) {
2969 2970 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "invalid "
2970 2971 "argument - snapshot not allowed with -e"));
2971 2972 return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf));
2972 2973 }
2973 2974
2974 2975 chopprefix = strrchr(sendfs, '/');
2975 2976
2976 2977 if (chopprefix == NULL) {
2977 2978 /*
2978 2979 * The tail is the poolname, so we need to
2979 2980 * prepend a path separator.
2980 2981 */
2981 2982 int len = strlen(drrb->drr_toname);
2982 2983 cp = malloc(len + 2);
2983 2984 cp[0] = '/';
2984 2985 (void) strcpy(&cp[1], drrb->drr_toname);
2985 2986 chopprefix = cp;
2986 2987 } else {
2987 2988 chopprefix = drrb->drr_toname + (chopprefix - sendfs);
2988 2989 }
2989 2990 } else if (flags->isprefix) {
2990 2991 /*
2991 2992 * A filesystem was specified with -d. We want to tack on
2992 2993 * everything but the first element of the sent snapshot path
2993 2994 * (all but the pool name).
2994 2995 */
2995 2996 if (strchr(tosnap, '@')) {
2996 2997 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "invalid "
2997 2998 "argument - snapshot not allowed with -d"));
2998 2999 return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf));
2999 3000 }
3000 3001
3001 3002 chopprefix = strchr(drrb->drr_toname, '/');
3002 3003 if (chopprefix == NULL)
3003 3004 chopprefix = strchr(drrb->drr_toname, '@');
3004 3005 } else if (strchr(tosnap, '@') == NULL) {
3005 3006 /*
3006 3007 * If a filesystem was specified without -d or -e, we want to
3007 3008 * tack on everything after the fs specified by 'zfs send'.
3008 3009 */
3009 3010 chopprefix = drrb->drr_toname + strlen(sendfs);
3010 3011 } else {
3011 3012 /* A snapshot was specified as an exact path (no -d or -e). */
3012 3013 if (flags->recursive) {
3013 3014 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3014 3015 "cannot specify snapshot name for multi-snapshot "
3015 3016 "stream"));
3016 3017 return (zfs_error(hdl, EZFS_BADSTREAM, errbuf));
3017 3018 }
3018 3019 chopprefix = drrb->drr_toname + strlen(drrb->drr_toname);
3019 3020 }
3020 3021
3021 3022 ASSERT(strstr(drrb->drr_toname, sendfs) == drrb->drr_toname);
3022 3023 ASSERT(chopprefix > drrb->drr_toname);
3023 3024 ASSERT(chopprefix <= drrb->drr_toname + strlen(drrb->drr_toname));
3024 3025 ASSERT(chopprefix[0] == '/' || chopprefix[0] == '@' ||
3025 3026 chopprefix[0] == '\0');
3026 3027
3027 3028 /*
3028 3029 * Determine name of destination snapshot, store in zc_value.
3029 3030 */
3030 3031 (void) strcpy(zc.zc_value, tosnap);
3031 3032 (void) strncat(zc.zc_value, chopprefix, sizeof (zc.zc_value));
3032 3033 free(cp);
3033 3034 if (!zfs_name_valid(zc.zc_value, ZFS_TYPE_SNAPSHOT)) {
3034 3035 zcmd_free_nvlists(&zc);
3035 3036 return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf));
3036 3037 }
3037 3038
3038 3039 /*
3039 3040 * Determine the name of the origin snapshot, store in zc_string.
3040 3041 */
3041 3042 if (drrb->drr_flags & DRR_FLAG_CLONE) {
3042 3043 if (guid_to_name(hdl, zc.zc_value,
3043 3044 drrb->drr_fromguid, B_FALSE, zc.zc_string) != 0) {
3044 3045 zcmd_free_nvlists(&zc);
3045 3046 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3046 3047 "local origin for clone %s does not exist"),
3047 3048 zc.zc_value);
3048 3049 return (zfs_error(hdl, EZFS_NOENT, errbuf));
3049 3050 }
3050 3051 if (flags->verbose)
3051 3052 (void) printf("found clone origin %s\n", zc.zc_string);
3052 3053 } else if (originsnap) {
3053 3054 (void) strncpy(zc.zc_string, originsnap, ZFS_MAXNAMELEN);
3054 3055 if (flags->verbose)
3055 3056 (void) printf("using provided clone origin %s\n",
3056 3057 zc.zc_string);
3057 3058 }
3058 3059
3059 3060 boolean_t resuming = DMU_GET_FEATUREFLAGS(drrb->drr_versioninfo) &
3060 3061 DMU_BACKUP_FEATURE_RESUMING;
3061 3062 stream_wantsnewfs = (drrb->drr_fromguid == NULL ||
3062 3063 (drrb->drr_flags & DRR_FLAG_CLONE) || originsnap) && !resuming;
3063 3064
3064 3065 if (stream_wantsnewfs) {
3065 3066 /*
3066 3067 * if the parent fs does not exist, look for it based on
3067 3068 * the parent snap GUID
3068 3069 */
3069 3070 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
3070 3071 "cannot receive new filesystem stream"));
3071 3072
3072 3073 (void) strcpy(zc.zc_name, zc.zc_value);
3073 3074 cp = strrchr(zc.zc_name, '/');
3074 3075 if (cp)
3075 3076 *cp = '\0';
3076 3077 if (cp &&
3077 3078 !zfs_dataset_exists(hdl, zc.zc_name, ZFS_TYPE_DATASET)) {
3078 3079 char suffix[ZFS_MAXNAMELEN];
3079 3080 (void) strcpy(suffix, strrchr(zc.zc_value, '/'));
3080 3081 if (guid_to_name(hdl, zc.zc_name, parent_snapguid,
3081 3082 B_FALSE, zc.zc_value) == 0) {
3082 3083 *strchr(zc.zc_value, '@') = '\0';
3083 3084 (void) strcat(zc.zc_value, suffix);
3084 3085 }
3085 3086 }
3086 3087 } else {
3087 3088 /*
3088 3089 * if the fs does not exist, look for it based on the
3089 3090 * fromsnap GUID
3090 3091 */
3091 3092 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
3092 3093 "cannot receive incremental stream"));
3093 3094
3094 3095 (void) strcpy(zc.zc_name, zc.zc_value);
3095 3096 *strchr(zc.zc_name, '@') = '\0';
3096 3097
3097 3098 /*
3098 3099 * If the exact receive path was specified and this is the
3099 3100 * topmost path in the stream, then if the fs does not exist we
3100 3101 * should look no further.
3101 3102 */
3102 3103 if ((flags->isprefix || (*(chopprefix = drrb->drr_toname +
3103 3104 strlen(sendfs)) != '\0' && *chopprefix != '@')) &&
3104 3105 !zfs_dataset_exists(hdl, zc.zc_name, ZFS_TYPE_DATASET)) {
3105 3106 char snap[ZFS_MAXNAMELEN];
3106 3107 (void) strcpy(snap, strchr(zc.zc_value, '@'));
3107 3108 if (guid_to_name(hdl, zc.zc_name, drrb->drr_fromguid,
3108 3109 B_FALSE, zc.zc_value) == 0) {
3109 3110 *strchr(zc.zc_value, '@') = '\0';
3110 3111 (void) strcat(zc.zc_value, snap);
3111 3112 }
3112 3113 }
3113 3114 }
3114 3115
3115 3116 (void) strcpy(zc.zc_name, zc.zc_value);
3116 3117 *strchr(zc.zc_name, '@') = '\0';
3117 3118
3118 3119 if (zfs_dataset_exists(hdl, zc.zc_name, ZFS_TYPE_DATASET)) {
3119 3120 zfs_handle_t *zhp;
3120 3121
3121 3122 /*
3122 3123 * Destination fs exists. It must be one of these cases:
3123 3124 * - an incremental send stream
3124 3125 * - the stream specifies a new fs (full stream or clone)
3125 3126 * and they want us to blow away the existing fs (and
3126 3127 * have therefore specified -F and removed any snapshots)
3127 3128 * - we are resuming a failed receive.
3128 3129 */
3129 3130 if (stream_wantsnewfs) {
3130 3131 if (!flags->force) {
3131 3132 zcmd_free_nvlists(&zc);
3132 3133 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3133 3134 "destination '%s' exists\n"
3134 3135 "must specify -F to overwrite it"),
3135 3136 zc.zc_name);
3136 3137 return (zfs_error(hdl, EZFS_EXISTS, errbuf));
3137 3138 }
3138 3139 if (ioctl(hdl->libzfs_fd, ZFS_IOC_SNAPSHOT_LIST_NEXT,
3139 3140 &zc) == 0) {
3140 3141 zcmd_free_nvlists(&zc);
3141 3142 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3142 3143 "destination has snapshots (eg. %s)\n"
3143 3144 "must destroy them to overwrite it"),
3144 3145 zc.zc_name);
3145 3146 return (zfs_error(hdl, EZFS_EXISTS, errbuf));
3146 3147 }
3147 3148 }
3148 3149
3149 3150 if ((zhp = zfs_open(hdl, zc.zc_name,
3150 3151 ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME)) == NULL) {
3151 3152 zcmd_free_nvlists(&zc);
3152 3153 return (-1);
3153 3154 }
3154 3155
3155 3156 if (stream_wantsnewfs &&
3156 3157 zhp->zfs_dmustats.dds_origin[0]) {
3157 3158 zcmd_free_nvlists(&zc);
3158 3159 zfs_close(zhp);
3159 3160 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3160 3161 "destination '%s' is a clone\n"
3161 3162 "must destroy it to overwrite it"),
3162 3163 zc.zc_name);
3163 3164 return (zfs_error(hdl, EZFS_EXISTS, errbuf));
3164 3165 }
3165 3166
3166 3167 if (!flags->dryrun && zhp->zfs_type == ZFS_TYPE_FILESYSTEM &&
3167 3168 stream_wantsnewfs) {
3168 3169 /* We can't do online recv in this case */
3169 3170 clp = changelist_gather(zhp, ZFS_PROP_NAME, 0, 0);
3170 3171 if (clp == NULL) {
3171 3172 zfs_close(zhp);
3172 3173 zcmd_free_nvlists(&zc);
3173 3174 return (-1);
3174 3175 }
3175 3176 if (changelist_prefix(clp) != 0) {
3176 3177 changelist_free(clp);
3177 3178 zfs_close(zhp);
3178 3179 zcmd_free_nvlists(&zc);
3179 3180 return (-1);
3180 3181 }
3181 3182 }
3182 3183
3183 3184 /*
3184 3185 * If we are resuming a newfs, set newfs here so that we will
3185 3186 * mount it if the recv succeeds this time. We can tell
3186 3187 * that it was a newfs on the first recv because the fs
3187 3188 * itself will be inconsistent (if the fs existed when we
3188 3189 * did the first recv, we would have received it into
3189 3190 * .../%recv).
3190 3191 */
3191 3192 if (resuming && zfs_prop_get_int(zhp, ZFS_PROP_INCONSISTENT))
3192 3193 newfs = B_TRUE;
3193 3194
3194 3195 zfs_close(zhp);
3195 3196 } else {
3196 3197 /*
3197 3198 * Destination filesystem does not exist. Therefore we better
3198 3199 * be creating a new filesystem (either from a full backup, or
3199 3200 * a clone). It would therefore be invalid if the user
3200 3201 * specified only the pool name (i.e. if the destination name
3201 3202 * contained no slash character).
3202 3203 */
3203 3204 if (!stream_wantsnewfs ||
3204 3205 (cp = strrchr(zc.zc_name, '/')) == NULL) {
3205 3206 zcmd_free_nvlists(&zc);
3206 3207 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3207 3208 "destination '%s' does not exist"), zc.zc_name);
3208 3209 return (zfs_error(hdl, EZFS_NOENT, errbuf));
3209 3210 }
3210 3211
3211 3212 /*
3212 3213 * Trim off the final dataset component so we perform the
3213 3214 * recvbackup ioctl to the filesystems's parent.
3214 3215 */
3215 3216 *cp = '\0';
3216 3217
3217 3218 if (flags->isprefix && !flags->istail && !flags->dryrun &&
3218 3219 create_parents(hdl, zc.zc_value, strlen(tosnap)) != 0) {
3219 3220 zcmd_free_nvlists(&zc);
3220 3221 return (zfs_error(hdl, EZFS_BADRESTORE, errbuf));
3221 3222 }
3222 3223
3223 3224 newfs = B_TRUE;
3224 3225 }
3225 3226
3226 3227 zc.zc_begin_record = *drr_noswap;
3227 3228 zc.zc_cookie = infd;
3228 3229 zc.zc_guid = flags->force;
3229 3230 zc.zc_resumable = flags->resumable;
3230 3231 if (flags->verbose) {
3231 3232 (void) printf("%s %s stream of %s into %s\n",
3232 3233 flags->dryrun ? "would receive" : "receiving",
3233 3234 drrb->drr_fromguid ? "incremental" : "full",
3234 3235 drrb->drr_toname, zc.zc_value);
3235 3236 (void) fflush(stdout);
3236 3237 }
3237 3238
3238 3239 if (flags->dryrun) {
3239 3240 zcmd_free_nvlists(&zc);
3240 3241 return (recv_skip(hdl, infd, flags->byteswap));
3241 3242 }
3242 3243
3243 3244 zc.zc_nvlist_dst = (uint64_t)(uintptr_t)prop_errbuf;
3244 3245 zc.zc_nvlist_dst_size = sizeof (prop_errbuf);
3245 3246 zc.zc_cleanup_fd = cleanup_fd;
3246 3247 zc.zc_action_handle = *action_handlep;
3247 3248
3248 3249 err = ioctl_err = zfs_ioctl(hdl, ZFS_IOC_RECV, &zc);
3249 3250 ioctl_errno = errno;
3250 3251 prop_errflags = (zprop_errflags_t)zc.zc_obj;
3251 3252
3252 3253 if (err == 0) {
3253 3254 nvlist_t *prop_errors;
3254 3255 VERIFY(0 == nvlist_unpack((void *)(uintptr_t)zc.zc_nvlist_dst,
3255 3256 zc.zc_nvlist_dst_size, &prop_errors, 0));
3256 3257
3257 3258 nvpair_t *prop_err = NULL;
3258 3259
3259 3260 while ((prop_err = nvlist_next_nvpair(prop_errors,
3260 3261 prop_err)) != NULL) {
3261 3262 char tbuf[1024];
3262 3263 zfs_prop_t prop;
3263 3264 int intval;
3264 3265
3265 3266 prop = zfs_name_to_prop(nvpair_name(prop_err));
3266 3267 (void) nvpair_value_int32(prop_err, &intval);
3267 3268 if (strcmp(nvpair_name(prop_err),
3268 3269 ZPROP_N_MORE_ERRORS) == 0) {
3269 3270 trunc_prop_errs(intval);
3270 3271 break;
3271 3272 } else if (snapname == NULL || finalsnap == NULL ||
3272 3273 strcmp(finalsnap, snapname) == 0 ||
3273 3274 strcmp(nvpair_name(prop_err),
3274 3275 zfs_prop_to_name(ZFS_PROP_REFQUOTA)) != 0) {
3275 3276 /*
3276 3277 * Skip the special case of, for example,
3277 3278 * "refquota", errors on intermediate
3278 3279 * snapshots leading up to a final one.
3279 3280 * That's why we have all of the checks above.
3280 3281 *
3281 3282 * See zfs_ioctl.c's extract_delay_props() for
3282 3283 * a list of props which can fail on
3283 3284 * intermediate snapshots, but shouldn't
3284 3285 * affect the overall receive.
3285 3286 */
3286 3287 (void) snprintf(tbuf, sizeof (tbuf),
3287 3288 dgettext(TEXT_DOMAIN,
3288 3289 "cannot receive %s property on %s"),
3289 3290 nvpair_name(prop_err), zc.zc_name);
3290 3291 zfs_setprop_error(hdl, prop, intval, tbuf);
3291 3292 }
3292 3293 }
3293 3294 nvlist_free(prop_errors);
3294 3295 }
3295 3296
3296 3297 zc.zc_nvlist_dst = 0;
3297 3298 zc.zc_nvlist_dst_size = 0;
3298 3299 zcmd_free_nvlists(&zc);
3299 3300
3300 3301 if (err == 0 && snapprops_nvlist) {
3301 3302 zfs_cmd_t zc2 = { 0 };
3302 3303
3303 3304 (void) strcpy(zc2.zc_name, zc.zc_value);
3304 3305 zc2.zc_cookie = B_TRUE; /* received */
3305 3306 if (zcmd_write_src_nvlist(hdl, &zc2, snapprops_nvlist) == 0) {
3306 3307 (void) zfs_ioctl(hdl, ZFS_IOC_SET_PROP, &zc2);
3307 3308 zcmd_free_nvlists(&zc2);
3308 3309 }
3309 3310 }
3310 3311
3311 3312 if (err && (ioctl_errno == ENOENT || ioctl_errno == EEXIST)) {
3312 3313 /*
3313 3314 * It may be that this snapshot already exists,
3314 3315 * in which case we want to consume & ignore it
3315 3316 * rather than failing.
3316 3317 */
3317 3318 avl_tree_t *local_avl;
3318 3319 nvlist_t *local_nv, *fs;
3319 3320 cp = strchr(zc.zc_value, '@');
3320 3321
3321 3322 /*
3322 3323 * XXX Do this faster by just iterating over snaps in
3323 3324 * this fs. Also if zc_value does not exist, we will
3324 3325 * get a strange "does not exist" error message.
3325 3326 */
3326 3327 *cp = '\0';
3327 3328 if (gather_nvlist(hdl, zc.zc_value, NULL, NULL, B_FALSE,
3328 3329 &local_nv, &local_avl) == 0) {
3329 3330 *cp = '@';
3330 3331 fs = fsavl_find(local_avl, drrb->drr_toguid, NULL);
3331 3332 fsavl_destroy(local_avl);
3332 3333 nvlist_free(local_nv);
3333 3334
3334 3335 if (fs != NULL) {
3335 3336 if (flags->verbose) {
3336 3337 (void) printf("snap %s already exists; "
3337 3338 "ignoring\n", zc.zc_value);
3338 3339 }
3339 3340 err = ioctl_err = recv_skip(hdl, infd,
3340 3341 flags->byteswap);
3341 3342 }
3342 3343 }
3343 3344 *cp = '@';
3344 3345 }
3345 3346
3346 3347 if (ioctl_err != 0) {
3347 3348 switch (ioctl_errno) {
3348 3349 case ENODEV:
3349 3350 cp = strchr(zc.zc_value, '@');
3350 3351 *cp = '\0';
3351 3352 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3352 3353 "most recent snapshot of %s does not\n"
3353 3354 "match incremental source"), zc.zc_value);
3354 3355 (void) zfs_error(hdl, EZFS_BADRESTORE, errbuf);
3355 3356 *cp = '@';
3356 3357 break;
3357 3358 case ETXTBSY:
3358 3359 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3359 3360 "destination %s has been modified\n"
3360 3361 "since most recent snapshot"), zc.zc_name);
3361 3362 (void) zfs_error(hdl, EZFS_BADRESTORE, errbuf);
3362 3363 break;
3363 3364 case EEXIST:
3364 3365 cp = strchr(zc.zc_value, '@');
3365 3366 if (newfs) {
3366 3367 /* it's the containing fs that exists */
3367 3368 *cp = '\0';
3368 3369 }
3369 3370 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3370 3371 "destination already exists"));
3371 3372 (void) zfs_error_fmt(hdl, EZFS_EXISTS,
3372 3373 dgettext(TEXT_DOMAIN, "cannot restore to %s"),
3373 3374 zc.zc_value);
3374 3375 *cp = '@';
3375 3376 break;
3376 3377 case EINVAL:
3377 3378 (void) zfs_error(hdl, EZFS_BADSTREAM, errbuf);
3378 3379 break;
3379 3380 case ECKSUM:
3380 3381 recv_ecksum_set_aux(hdl, zc.zc_value, flags->resumable);
3381 3382 (void) zfs_error(hdl, EZFS_BADSTREAM, errbuf);
3382 3383 break;
3383 3384 case ENOTSUP:
3384 3385 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3385 3386 "pool must be upgraded to receive this stream."));
3386 3387 (void) zfs_error(hdl, EZFS_BADVERSION, errbuf);
3387 3388 break;
3388 3389 case EDQUOT:
3389 3390 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3390 3391 "destination %s space quota exceeded"), zc.zc_name);
3391 3392 (void) zfs_error(hdl, EZFS_NOSPC, errbuf);
3392 3393 break;
3393 3394 default:
3394 3395 (void) zfs_standard_error(hdl, ioctl_errno, errbuf);
3395 3396 }
3396 3397 }
3397 3398
3398 3399 /*
3399 3400 * Mount the target filesystem (if created). Also mount any
3400 3401 * children of the target filesystem if we did a replication
3401 3402 * receive (indicated by stream_avl being non-NULL).
3402 3403 */
3403 3404 cp = strchr(zc.zc_value, '@');
3404 3405 if (cp && (ioctl_err == 0 || !newfs)) {
3405 3406 zfs_handle_t *h;
3406 3407
3407 3408 *cp = '\0';
3408 3409 h = zfs_open(hdl, zc.zc_value,
3409 3410 ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME);
3410 3411 if (h != NULL) {
3411 3412 if (h->zfs_type == ZFS_TYPE_VOLUME) {
3412 3413 *cp = '@';
3413 3414 } else if (newfs || stream_avl) {
3414 3415 /*
3415 3416 * Track the first/top of hierarchy fs,
3416 3417 * for mounting and sharing later.
3417 3418 */
3418 3419 if (top_zfs && *top_zfs == NULL)
3419 3420 *top_zfs = zfs_strdup(hdl, zc.zc_value);
3420 3421 }
3421 3422 zfs_close(h);
3422 3423 }
3423 3424 *cp = '@';
3424 3425 }
3425 3426
3426 3427 if (clp) {
3427 3428 err |= changelist_postfix(clp);
3428 3429 changelist_free(clp);
3429 3430 }
3430 3431
3431 3432 if (prop_errflags & ZPROP_ERR_NOCLEAR) {
3432 3433 (void) fprintf(stderr, dgettext(TEXT_DOMAIN, "Warning: "
3433 3434 "failed to clear unreceived properties on %s"),
3434 3435 zc.zc_name);
3435 3436 (void) fprintf(stderr, "\n");
3436 3437 }
3437 3438 if (prop_errflags & ZPROP_ERR_NORESTORE) {
3438 3439 (void) fprintf(stderr, dgettext(TEXT_DOMAIN, "Warning: "
3439 3440 "failed to restore original properties on %s"),
3440 3441 zc.zc_name);
3441 3442 (void) fprintf(stderr, "\n");
3442 3443 }
3443 3444
3444 3445 if (err || ioctl_err)
3445 3446 return (-1);
3446 3447
3447 3448 *action_handlep = zc.zc_action_handle;
3448 3449
3449 3450 if (flags->verbose) {
3450 3451 char buf1[64];
3451 3452 char buf2[64];
3452 3453 uint64_t bytes = zc.zc_cookie;
3453 3454 time_t delta = time(NULL) - begin_time;
3454 3455 if (delta == 0)
3455 3456 delta = 1;
3456 3457 zfs_nicenum(bytes, buf1, sizeof (buf1));
3457 3458 zfs_nicenum(bytes/delta, buf2, sizeof (buf1));
3458 3459
3459 3460 (void) printf("received %sB stream in %lu seconds (%sB/sec)\n",
3460 3461 buf1, delta, buf2);
3461 3462 }
3462 3463
3463 3464 return (0);
3464 3465 }
3465 3466
3466 3467 static int
3467 3468 zfs_receive_impl(libzfs_handle_t *hdl, const char *tosnap,
3468 3469 const char *originsnap, recvflags_t *flags, int infd, const char *sendfs,
3469 3470 nvlist_t *stream_nv, avl_tree_t *stream_avl, char **top_zfs, int cleanup_fd,
3470 3471 uint64_t *action_handlep, const char *finalsnap)
3471 3472 {
3472 3473 int err;
3473 3474 dmu_replay_record_t drr, drr_noswap;
3474 3475 struct drr_begin *drrb = &drr.drr_u.drr_begin;
3475 3476 char errbuf[1024];
3476 3477 zio_cksum_t zcksum = { 0 };
3477 3478 uint64_t featureflags;
3478 3479 int hdrtype;
3479 3480
3480 3481 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
3481 3482 "cannot receive"));
3482 3483
3483 3484 if (flags->isprefix &&
3484 3485 !zfs_dataset_exists(hdl, tosnap, ZFS_TYPE_DATASET)) {
3485 3486 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "specified fs "
3486 3487 "(%s) does not exist"), tosnap);
3487 3488 return (zfs_error(hdl, EZFS_NOENT, errbuf));
3488 3489 }
3489 3490 if (originsnap &&
3490 3491 !zfs_dataset_exists(hdl, originsnap, ZFS_TYPE_DATASET)) {
3491 3492 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "specified origin fs "
3492 3493 "(%s) does not exist"), originsnap);
3493 3494 return (zfs_error(hdl, EZFS_NOENT, errbuf));
3494 3495 }
3495 3496
3496 3497 /* read in the BEGIN record */
3497 3498 if (0 != (err = recv_read(hdl, infd, &drr, sizeof (drr), B_FALSE,
3498 3499 &zcksum)))
3499 3500 return (err);
3500 3501
3501 3502 if (drr.drr_type == DRR_END || drr.drr_type == BSWAP_32(DRR_END)) {
3502 3503 /* It's the double end record at the end of a package */
3503 3504 return (ENODATA);
3504 3505 }
3505 3506
3506 3507 /* the kernel needs the non-byteswapped begin record */
3507 3508 drr_noswap = drr;
3508 3509
3509 3510 flags->byteswap = B_FALSE;
3510 3511 if (drrb->drr_magic == BSWAP_64(DMU_BACKUP_MAGIC)) {
3511 3512 /*
3512 3513 * We computed the checksum in the wrong byteorder in
3513 3514 * recv_read() above; do it again correctly.
3514 3515 */
3515 3516 bzero(&zcksum, sizeof (zio_cksum_t));
3516 3517 fletcher_4_incremental_byteswap(&drr, sizeof (drr), &zcksum);
3517 3518 flags->byteswap = B_TRUE;
3518 3519
3519 3520 drr.drr_type = BSWAP_32(drr.drr_type);
3520 3521 drr.drr_payloadlen = BSWAP_32(drr.drr_payloadlen);
3521 3522 drrb->drr_magic = BSWAP_64(drrb->drr_magic);
3522 3523 drrb->drr_versioninfo = BSWAP_64(drrb->drr_versioninfo);
3523 3524 drrb->drr_creation_time = BSWAP_64(drrb->drr_creation_time);
3524 3525 drrb->drr_type = BSWAP_32(drrb->drr_type);
3525 3526 drrb->drr_flags = BSWAP_32(drrb->drr_flags);
3526 3527 drrb->drr_toguid = BSWAP_64(drrb->drr_toguid);
3527 3528 drrb->drr_fromguid = BSWAP_64(drrb->drr_fromguid);
3528 3529 }
3529 3530
3530 3531 if (drrb->drr_magic != DMU_BACKUP_MAGIC || drr.drr_type != DRR_BEGIN) {
3531 3532 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "invalid "
3532 3533 "stream (bad magic number)"));
3533 3534 return (zfs_error(hdl, EZFS_BADSTREAM, errbuf));
3534 3535 }
3535 3536
3536 3537 featureflags = DMU_GET_FEATUREFLAGS(drrb->drr_versioninfo);
3537 3538 hdrtype = DMU_GET_STREAM_HDRTYPE(drrb->drr_versioninfo);
3538 3539
3539 3540 if (!DMU_STREAM_SUPPORTED(featureflags) ||
3540 3541 (hdrtype != DMU_SUBSTREAM && hdrtype != DMU_COMPOUNDSTREAM)) {
3541 3542 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3542 3543 "stream has unsupported feature, feature flags = %lx"),
3543 3544 featureflags);
3544 3545 return (zfs_error(hdl, EZFS_BADSTREAM, errbuf));
3545 3546 }
3546 3547
3547 3548 if (strchr(drrb->drr_toname, '@') == NULL) {
3548 3549 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "invalid "
3549 3550 "stream (bad snapshot name)"));
3550 3551 return (zfs_error(hdl, EZFS_BADSTREAM, errbuf));
3551 3552 }
3552 3553
3553 3554 if (DMU_GET_STREAM_HDRTYPE(drrb->drr_versioninfo) == DMU_SUBSTREAM) {
3554 3555 char nonpackage_sendfs[ZFS_MAXNAMELEN];
3555 3556 if (sendfs == NULL) {
3556 3557 /*
3557 3558 * We were not called from zfs_receive_package(). Get
3558 3559 * the fs specified by 'zfs send'.
3559 3560 */
3560 3561 char *cp;
3561 3562 (void) strlcpy(nonpackage_sendfs,
3562 3563 drr.drr_u.drr_begin.drr_toname, ZFS_MAXNAMELEN);
3563 3564 if ((cp = strchr(nonpackage_sendfs, '@')) != NULL)
3564 3565 *cp = '\0';
3565 3566 sendfs = nonpackage_sendfs;
3566 3567 VERIFY(finalsnap == NULL);
3567 3568 }
3568 3569 flags->recursive =
3569 3570 (nvlist_lookup_boolean(stream_nv, "not_recursive") ==
3570 3571 ENOENT);
3571 3572 err = zfs_receive_one(hdl, infd, tosnap, originsnap, flags,
3572 3573 &drr, &drr_noswap, sendfs, stream_avl, top_zfs,
3573 3574 cleanup_fd, action_handlep, finalsnap);
3574 3575 /* Clear out internal-only flags. */
3575 3576 flags->recursive = B_FALSE;
3576 3577 return (err);
3577 3578 } else {
3578 3579 assert(DMU_GET_STREAM_HDRTYPE(drrb->drr_versioninfo) ==
3579 3580 DMU_COMPOUNDSTREAM);
3580 3581 return (zfs_receive_package(hdl, infd, tosnap, flags, &drr,
3581 3582 &zcksum, top_zfs, cleanup_fd, action_handlep));
3582 3583 }
3583 3584 }
3584 3585
3585 3586 /*
3586 3587 * Restores a backup of tosnap from the file descriptor specified by infd.
3587 3588 * Return 0 on total success, -2 if some things couldn't be
3588 3589 * destroyed/renamed/promoted, -1 if some things couldn't be received.
3589 3590 * (-1 will override -2, if -1 and the resumable flag was specified the
3590 3591 * transfer can be resumed if the sending side supports it).
3591 3592 */
3592 3593 int
3593 3594 zfs_receive(libzfs_handle_t *hdl, const char *tosnap, nvlist_t *props,
3594 3595 recvflags_t *flags, int infd, avl_tree_t *stream_avl)
3595 3596 {
3596 3597 char *top_zfs = NULL;
3597 3598 int err;
3598 3599 int cleanup_fd;
3599 3600 uint64_t action_handle = 0;
3600 3601 char *originsnap = NULL;
3601 3602 if (props) {
3602 3603 err = nvlist_lookup_string(props, "origin", &originsnap);
3603 3604 if (err && err != ENOENT)
3604 3605 return (err);
3605 3606 }
3606 3607
3607 3608 cleanup_fd = open(ZFS_DEV, O_RDWR|O_EXCL);
3608 3609 VERIFY(cleanup_fd >= 0);
3609 3610
3610 3611 err = zfs_receive_impl(hdl, tosnap, originsnap, flags, infd, NULL, NULL,
3611 3612 stream_avl, &top_zfs, cleanup_fd, &action_handle, NULL);
3612 3613
3613 3614 VERIFY(0 == close(cleanup_fd));
3614 3615
3615 3616 if (err == 0 && !flags->nomount && top_zfs) {
3616 3617 zfs_handle_t *zhp;
3617 3618 prop_changelist_t *clp;
3618 3619
3619 3620 zhp = zfs_open(hdl, top_zfs, ZFS_TYPE_FILESYSTEM);
3620 3621 if (zhp != NULL) {
3621 3622 clp = changelist_gather(zhp, ZFS_PROP_MOUNTPOINT,
3622 3623 CL_GATHER_MOUNT_ALWAYS, 0);
3623 3624 zfs_close(zhp);
3624 3625 if (clp != NULL) {
3625 3626 /* mount and share received datasets */
3626 3627 err = changelist_postfix(clp);
3627 3628 changelist_free(clp);
3628 3629 }
3629 3630 }
3630 3631 if (zhp == NULL || clp == NULL || err)
3631 3632 err = -1;
3632 3633 }
3633 3634 if (top_zfs)
3634 3635 free(top_zfs);
3635 3636
3636 3637 return (err);
3637 3638 }
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