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3740 Poor ZFS send / receive performance due to snapshot hold / release processing
Submitted by: Steven Hartland <steven.hartland@multiplay.co.uk>
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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
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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) 2012 by Delphix. All rights reserved.
25 25 * Copyright (c) 2012, Joyent, Inc. All rights reserved.
26 + * Copyright (c) 2013 Steven Hartland. All rights reserved.
26 27 */
27 28
28 29 #include <assert.h>
29 30 #include <ctype.h>
30 31 #include <errno.h>
31 32 #include <libintl.h>
32 33 #include <stdio.h>
33 34 #include <stdlib.h>
34 35 #include <strings.h>
35 36 #include <unistd.h>
36 37 #include <stddef.h>
37 38 #include <fcntl.h>
38 39 #include <sys/mount.h>
39 40 #include <pthread.h>
40 41 #include <umem.h>
41 42 #include <time.h>
42 43
43 44 #include <libzfs.h>
44 45
45 46 #include "zfs_namecheck.h"
46 47 #include "zfs_prop.h"
47 48 #include "zfs_fletcher.h"
48 49 #include "libzfs_impl.h"
49 50 #include <sha2.h>
50 51 #include <sys/zio_checksum.h>
51 52 #include <sys/ddt.h>
52 53
53 54 /* in libzfs_dataset.c */
54 55 extern void zfs_setprop_error(libzfs_handle_t *, zfs_prop_t, int, char *);
55 56
56 57 static int zfs_receive_impl(libzfs_handle_t *, const char *, recvflags_t *,
57 58 int, const char *, nvlist_t *, avl_tree_t *, char **, int, uint64_t *);
58 59
59 60 static const zio_cksum_t zero_cksum = { 0 };
60 61
61 62 typedef struct dedup_arg {
62 63 int inputfd;
63 64 int outputfd;
64 65 libzfs_handle_t *dedup_hdl;
65 66 } dedup_arg_t;
66 67
67 68 typedef struct progress_arg {
68 69 zfs_handle_t *pa_zhp;
69 70 int pa_fd;
70 71 boolean_t pa_parsable;
71 72 } progress_arg_t;
72 73
73 74 typedef struct dataref {
74 75 uint64_t ref_guid;
75 76 uint64_t ref_object;
76 77 uint64_t ref_offset;
77 78 } dataref_t;
78 79
79 80 typedef struct dedup_entry {
80 81 struct dedup_entry *dde_next;
81 82 zio_cksum_t dde_chksum;
82 83 uint64_t dde_prop;
83 84 dataref_t dde_ref;
84 85 } dedup_entry_t;
85 86
86 87 #define MAX_DDT_PHYSMEM_PERCENT 20
87 88 #define SMALLEST_POSSIBLE_MAX_DDT_MB 128
88 89
89 90 typedef struct dedup_table {
90 91 dedup_entry_t **dedup_hash_array;
91 92 umem_cache_t *ddecache;
92 93 uint64_t max_ddt_size; /* max dedup table size in bytes */
93 94 uint64_t cur_ddt_size; /* current dedup table size in bytes */
94 95 uint64_t ddt_count;
95 96 int numhashbits;
96 97 boolean_t ddt_full;
97 98 } dedup_table_t;
98 99
99 100 static int
100 101 high_order_bit(uint64_t n)
101 102 {
102 103 int count;
103 104
104 105 for (count = 0; n != 0; count++)
105 106 n >>= 1;
106 107 return (count);
107 108 }
108 109
109 110 static size_t
110 111 ssread(void *buf, size_t len, FILE *stream)
111 112 {
112 113 size_t outlen;
113 114
114 115 if ((outlen = fread(buf, len, 1, stream)) == 0)
115 116 return (0);
116 117
117 118 return (outlen);
118 119 }
119 120
120 121 static void
121 122 ddt_hash_append(libzfs_handle_t *hdl, dedup_table_t *ddt, dedup_entry_t **ddepp,
122 123 zio_cksum_t *cs, uint64_t prop, dataref_t *dr)
123 124 {
124 125 dedup_entry_t *dde;
125 126
126 127 if (ddt->cur_ddt_size >= ddt->max_ddt_size) {
127 128 if (ddt->ddt_full == B_FALSE) {
128 129 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
129 130 "Dedup table full. Deduplication will continue "
130 131 "with existing table entries"));
131 132 ddt->ddt_full = B_TRUE;
132 133 }
133 134 return;
134 135 }
135 136
136 137 if ((dde = umem_cache_alloc(ddt->ddecache, UMEM_DEFAULT))
137 138 != NULL) {
138 139 assert(*ddepp == NULL);
139 140 dde->dde_next = NULL;
140 141 dde->dde_chksum = *cs;
141 142 dde->dde_prop = prop;
142 143 dde->dde_ref = *dr;
143 144 *ddepp = dde;
144 145 ddt->cur_ddt_size += sizeof (dedup_entry_t);
145 146 ddt->ddt_count++;
146 147 }
147 148 }
148 149
149 150 /*
150 151 * Using the specified dedup table, do a lookup for an entry with
151 152 * the checksum cs. If found, return the block's reference info
152 153 * in *dr. Otherwise, insert a new entry in the dedup table, using
153 154 * the reference information specified by *dr.
154 155 *
155 156 * return value: true - entry was found
156 157 * false - entry was not found
157 158 */
158 159 static boolean_t
159 160 ddt_update(libzfs_handle_t *hdl, dedup_table_t *ddt, zio_cksum_t *cs,
160 161 uint64_t prop, dataref_t *dr)
161 162 {
162 163 uint32_t hashcode;
163 164 dedup_entry_t **ddepp;
164 165
165 166 hashcode = BF64_GET(cs->zc_word[0], 0, ddt->numhashbits);
166 167
167 168 for (ddepp = &(ddt->dedup_hash_array[hashcode]); *ddepp != NULL;
168 169 ddepp = &((*ddepp)->dde_next)) {
169 170 if (ZIO_CHECKSUM_EQUAL(((*ddepp)->dde_chksum), *cs) &&
170 171 (*ddepp)->dde_prop == prop) {
171 172 *dr = (*ddepp)->dde_ref;
172 173 return (B_TRUE);
173 174 }
174 175 }
175 176 ddt_hash_append(hdl, ddt, ddepp, cs, prop, dr);
176 177 return (B_FALSE);
177 178 }
178 179
179 180 static int
180 181 cksum_and_write(const void *buf, uint64_t len, zio_cksum_t *zc, int outfd)
181 182 {
182 183 fletcher_4_incremental_native(buf, len, zc);
183 184 return (write(outfd, buf, len));
184 185 }
185 186
186 187 /*
187 188 * This function is started in a separate thread when the dedup option
188 189 * has been requested. The main send thread determines the list of
189 190 * snapshots to be included in the send stream and makes the ioctl calls
190 191 * for each one. But instead of having the ioctl send the output to the
191 192 * the output fd specified by the caller of zfs_send()), the
192 193 * ioctl is told to direct the output to a pipe, which is read by the
193 194 * alternate thread running THIS function. This function does the
194 195 * dedup'ing by:
195 196 * 1. building a dedup table (the DDT)
196 197 * 2. doing checksums on each data block and inserting a record in the DDT
197 198 * 3. looking for matching checksums, and
198 199 * 4. sending a DRR_WRITE_BYREF record instead of a write record whenever
199 200 * a duplicate block is found.
200 201 * The output of this function then goes to the output fd requested
201 202 * by the caller of zfs_send().
202 203 */
203 204 static void *
204 205 cksummer(void *arg)
205 206 {
206 207 dedup_arg_t *dda = arg;
207 208 char *buf = malloc(1<<20);
208 209 dmu_replay_record_t thedrr;
209 210 dmu_replay_record_t *drr = &thedrr;
210 211 struct drr_begin *drrb = &thedrr.drr_u.drr_begin;
211 212 struct drr_end *drre = &thedrr.drr_u.drr_end;
212 213 struct drr_object *drro = &thedrr.drr_u.drr_object;
213 214 struct drr_write *drrw = &thedrr.drr_u.drr_write;
214 215 struct drr_spill *drrs = &thedrr.drr_u.drr_spill;
215 216 FILE *ofp;
216 217 int outfd;
217 218 dmu_replay_record_t wbr_drr = {0};
218 219 struct drr_write_byref *wbr_drrr = &wbr_drr.drr_u.drr_write_byref;
219 220 dedup_table_t ddt;
220 221 zio_cksum_t stream_cksum;
221 222 uint64_t physmem = sysconf(_SC_PHYS_PAGES) * sysconf(_SC_PAGESIZE);
222 223 uint64_t numbuckets;
223 224
224 225 ddt.max_ddt_size =
225 226 MAX((physmem * MAX_DDT_PHYSMEM_PERCENT)/100,
226 227 SMALLEST_POSSIBLE_MAX_DDT_MB<<20);
227 228
228 229 numbuckets = ddt.max_ddt_size/(sizeof (dedup_entry_t));
229 230
230 231 /*
231 232 * numbuckets must be a power of 2. Increase number to
232 233 * a power of 2 if necessary.
233 234 */
234 235 if (!ISP2(numbuckets))
235 236 numbuckets = 1 << high_order_bit(numbuckets);
236 237
237 238 ddt.dedup_hash_array = calloc(numbuckets, sizeof (dedup_entry_t *));
238 239 ddt.ddecache = umem_cache_create("dde", sizeof (dedup_entry_t), 0,
239 240 NULL, NULL, NULL, NULL, NULL, 0);
240 241 ddt.cur_ddt_size = numbuckets * sizeof (dedup_entry_t *);
241 242 ddt.numhashbits = high_order_bit(numbuckets) - 1;
242 243 ddt.ddt_full = B_FALSE;
243 244
244 245 /* Initialize the write-by-reference block. */
245 246 wbr_drr.drr_type = DRR_WRITE_BYREF;
246 247 wbr_drr.drr_payloadlen = 0;
247 248
248 249 outfd = dda->outputfd;
249 250 ofp = fdopen(dda->inputfd, "r");
250 251 while (ssread(drr, sizeof (dmu_replay_record_t), ofp) != 0) {
251 252
252 253 switch (drr->drr_type) {
253 254 case DRR_BEGIN:
254 255 {
255 256 int fflags;
256 257 ZIO_SET_CHECKSUM(&stream_cksum, 0, 0, 0, 0);
257 258
258 259 /* set the DEDUP feature flag for this stream */
259 260 fflags = DMU_GET_FEATUREFLAGS(drrb->drr_versioninfo);
260 261 fflags |= (DMU_BACKUP_FEATURE_DEDUP |
261 262 DMU_BACKUP_FEATURE_DEDUPPROPS);
262 263 DMU_SET_FEATUREFLAGS(drrb->drr_versioninfo, fflags);
263 264
264 265 if (cksum_and_write(drr, sizeof (dmu_replay_record_t),
265 266 &stream_cksum, outfd) == -1)
266 267 goto out;
267 268 if (DMU_GET_STREAM_HDRTYPE(drrb->drr_versioninfo) ==
268 269 DMU_COMPOUNDSTREAM && drr->drr_payloadlen != 0) {
269 270 int sz = drr->drr_payloadlen;
270 271
271 272 if (sz > 1<<20) {
272 273 free(buf);
273 274 buf = malloc(sz);
274 275 }
275 276 (void) ssread(buf, sz, ofp);
276 277 if (ferror(stdin))
277 278 perror("fread");
278 279 if (cksum_and_write(buf, sz, &stream_cksum,
279 280 outfd) == -1)
280 281 goto out;
281 282 }
282 283 break;
283 284 }
284 285
285 286 case DRR_END:
286 287 {
287 288 /* use the recalculated checksum */
288 289 ZIO_SET_CHECKSUM(&drre->drr_checksum,
289 290 stream_cksum.zc_word[0], stream_cksum.zc_word[1],
290 291 stream_cksum.zc_word[2], stream_cksum.zc_word[3]);
291 292 if ((write(outfd, drr,
292 293 sizeof (dmu_replay_record_t))) == -1)
293 294 goto out;
294 295 break;
295 296 }
296 297
297 298 case DRR_OBJECT:
298 299 {
299 300 if (cksum_and_write(drr, sizeof (dmu_replay_record_t),
300 301 &stream_cksum, outfd) == -1)
301 302 goto out;
302 303 if (drro->drr_bonuslen > 0) {
303 304 (void) ssread(buf,
304 305 P2ROUNDUP((uint64_t)drro->drr_bonuslen, 8),
305 306 ofp);
306 307 if (cksum_and_write(buf,
307 308 P2ROUNDUP((uint64_t)drro->drr_bonuslen, 8),
308 309 &stream_cksum, outfd) == -1)
309 310 goto out;
310 311 }
311 312 break;
312 313 }
313 314
314 315 case DRR_SPILL:
315 316 {
316 317 if (cksum_and_write(drr, sizeof (dmu_replay_record_t),
317 318 &stream_cksum, outfd) == -1)
318 319 goto out;
319 320 (void) ssread(buf, drrs->drr_length, ofp);
320 321 if (cksum_and_write(buf, drrs->drr_length,
321 322 &stream_cksum, outfd) == -1)
322 323 goto out;
323 324 break;
324 325 }
325 326
326 327 case DRR_FREEOBJECTS:
327 328 {
328 329 if (cksum_and_write(drr, sizeof (dmu_replay_record_t),
329 330 &stream_cksum, outfd) == -1)
330 331 goto out;
331 332 break;
332 333 }
333 334
334 335 case DRR_WRITE:
335 336 {
336 337 dataref_t dataref;
337 338
338 339 (void) ssread(buf, drrw->drr_length, ofp);
339 340
340 341 /*
341 342 * Use the existing checksum if it's dedup-capable,
342 343 * else calculate a SHA256 checksum for it.
343 344 */
344 345
345 346 if (ZIO_CHECKSUM_EQUAL(drrw->drr_key.ddk_cksum,
346 347 zero_cksum) ||
347 348 !DRR_IS_DEDUP_CAPABLE(drrw->drr_checksumflags)) {
348 349 SHA256_CTX ctx;
349 350 zio_cksum_t tmpsha256;
350 351
351 352 SHA256Init(&ctx);
352 353 SHA256Update(&ctx, buf, drrw->drr_length);
353 354 SHA256Final(&tmpsha256, &ctx);
354 355 drrw->drr_key.ddk_cksum.zc_word[0] =
355 356 BE_64(tmpsha256.zc_word[0]);
356 357 drrw->drr_key.ddk_cksum.zc_word[1] =
357 358 BE_64(tmpsha256.zc_word[1]);
358 359 drrw->drr_key.ddk_cksum.zc_word[2] =
359 360 BE_64(tmpsha256.zc_word[2]);
360 361 drrw->drr_key.ddk_cksum.zc_word[3] =
361 362 BE_64(tmpsha256.zc_word[3]);
362 363 drrw->drr_checksumtype = ZIO_CHECKSUM_SHA256;
363 364 drrw->drr_checksumflags = DRR_CHECKSUM_DEDUP;
364 365 }
365 366
366 367 dataref.ref_guid = drrw->drr_toguid;
367 368 dataref.ref_object = drrw->drr_object;
368 369 dataref.ref_offset = drrw->drr_offset;
369 370
370 371 if (ddt_update(dda->dedup_hdl, &ddt,
371 372 &drrw->drr_key.ddk_cksum, drrw->drr_key.ddk_prop,
372 373 &dataref)) {
373 374 /* block already present in stream */
374 375 wbr_drrr->drr_object = drrw->drr_object;
375 376 wbr_drrr->drr_offset = drrw->drr_offset;
376 377 wbr_drrr->drr_length = drrw->drr_length;
377 378 wbr_drrr->drr_toguid = drrw->drr_toguid;
378 379 wbr_drrr->drr_refguid = dataref.ref_guid;
379 380 wbr_drrr->drr_refobject =
380 381 dataref.ref_object;
381 382 wbr_drrr->drr_refoffset =
382 383 dataref.ref_offset;
383 384
384 385 wbr_drrr->drr_checksumtype =
385 386 drrw->drr_checksumtype;
386 387 wbr_drrr->drr_checksumflags =
387 388 drrw->drr_checksumtype;
388 389 wbr_drrr->drr_key.ddk_cksum =
389 390 drrw->drr_key.ddk_cksum;
390 391 wbr_drrr->drr_key.ddk_prop =
391 392 drrw->drr_key.ddk_prop;
392 393
393 394 if (cksum_and_write(&wbr_drr,
394 395 sizeof (dmu_replay_record_t), &stream_cksum,
395 396 outfd) == -1)
396 397 goto out;
397 398 } else {
398 399 /* block not previously seen */
399 400 if (cksum_and_write(drr,
400 401 sizeof (dmu_replay_record_t), &stream_cksum,
401 402 outfd) == -1)
402 403 goto out;
403 404 if (cksum_and_write(buf,
404 405 drrw->drr_length,
405 406 &stream_cksum, outfd) == -1)
406 407 goto out;
407 408 }
408 409 break;
409 410 }
410 411
411 412 case DRR_FREE:
412 413 {
413 414 if (cksum_and_write(drr, sizeof (dmu_replay_record_t),
414 415 &stream_cksum, outfd) == -1)
415 416 goto out;
416 417 break;
417 418 }
418 419
419 420 default:
420 421 (void) printf("INVALID record type 0x%x\n",
421 422 drr->drr_type);
422 423 /* should never happen, so assert */
423 424 assert(B_FALSE);
424 425 }
425 426 }
426 427 out:
427 428 umem_cache_destroy(ddt.ddecache);
428 429 free(ddt.dedup_hash_array);
429 430 free(buf);
430 431 (void) fclose(ofp);
431 432
432 433 return (NULL);
433 434 }
434 435
435 436 /*
436 437 * Routines for dealing with the AVL tree of fs-nvlists
437 438 */
438 439 typedef struct fsavl_node {
439 440 avl_node_t fn_node;
440 441 nvlist_t *fn_nvfs;
441 442 char *fn_snapname;
442 443 uint64_t fn_guid;
443 444 } fsavl_node_t;
444 445
445 446 static int
446 447 fsavl_compare(const void *arg1, const void *arg2)
447 448 {
448 449 const fsavl_node_t *fn1 = arg1;
449 450 const fsavl_node_t *fn2 = arg2;
450 451
451 452 if (fn1->fn_guid > fn2->fn_guid)
452 453 return (+1);
453 454 else if (fn1->fn_guid < fn2->fn_guid)
454 455 return (-1);
455 456 else
456 457 return (0);
457 458 }
458 459
459 460 /*
460 461 * Given the GUID of a snapshot, find its containing filesystem and
461 462 * (optionally) name.
462 463 */
463 464 static nvlist_t *
464 465 fsavl_find(avl_tree_t *avl, uint64_t snapguid, char **snapname)
465 466 {
466 467 fsavl_node_t fn_find;
467 468 fsavl_node_t *fn;
468 469
469 470 fn_find.fn_guid = snapguid;
470 471
471 472 fn = avl_find(avl, &fn_find, NULL);
472 473 if (fn) {
473 474 if (snapname)
474 475 *snapname = fn->fn_snapname;
475 476 return (fn->fn_nvfs);
476 477 }
477 478 return (NULL);
478 479 }
479 480
480 481 static void
481 482 fsavl_destroy(avl_tree_t *avl)
482 483 {
483 484 fsavl_node_t *fn;
484 485 void *cookie;
485 486
486 487 if (avl == NULL)
487 488 return;
488 489
489 490 cookie = NULL;
490 491 while ((fn = avl_destroy_nodes(avl, &cookie)) != NULL)
491 492 free(fn);
492 493 avl_destroy(avl);
493 494 free(avl);
494 495 }
495 496
496 497 /*
497 498 * Given an nvlist, produce an avl tree of snapshots, ordered by guid
498 499 */
499 500 static avl_tree_t *
500 501 fsavl_create(nvlist_t *fss)
501 502 {
502 503 avl_tree_t *fsavl;
503 504 nvpair_t *fselem = NULL;
504 505
505 506 if ((fsavl = malloc(sizeof (avl_tree_t))) == NULL)
506 507 return (NULL);
507 508
508 509 avl_create(fsavl, fsavl_compare, sizeof (fsavl_node_t),
509 510 offsetof(fsavl_node_t, fn_node));
510 511
511 512 while ((fselem = nvlist_next_nvpair(fss, fselem)) != NULL) {
512 513 nvlist_t *nvfs, *snaps;
513 514 nvpair_t *snapelem = NULL;
514 515
515 516 VERIFY(0 == nvpair_value_nvlist(fselem, &nvfs));
516 517 VERIFY(0 == nvlist_lookup_nvlist(nvfs, "snaps", &snaps));
517 518
518 519 while ((snapelem =
519 520 nvlist_next_nvpair(snaps, snapelem)) != NULL) {
520 521 fsavl_node_t *fn;
521 522 uint64_t guid;
522 523
523 524 VERIFY(0 == nvpair_value_uint64(snapelem, &guid));
524 525 if ((fn = malloc(sizeof (fsavl_node_t))) == NULL) {
525 526 fsavl_destroy(fsavl);
526 527 return (NULL);
527 528 }
528 529 fn->fn_nvfs = nvfs;
529 530 fn->fn_snapname = nvpair_name(snapelem);
530 531 fn->fn_guid = guid;
531 532
532 533 /*
533 534 * Note: if there are multiple snaps with the
534 535 * same GUID, we ignore all but one.
535 536 */
536 537 if (avl_find(fsavl, fn, NULL) == NULL)
537 538 avl_add(fsavl, fn);
538 539 else
539 540 free(fn);
540 541 }
541 542 }
542 543
543 544 return (fsavl);
544 545 }
545 546
546 547 /*
547 548 * Routines for dealing with the giant nvlist of fs-nvlists, etc.
548 549 */
549 550 typedef struct send_data {
550 551 uint64_t parent_fromsnap_guid;
551 552 nvlist_t *parent_snaps;
552 553 nvlist_t *fss;
553 554 nvlist_t *snapprops;
554 555 const char *fromsnap;
555 556 const char *tosnap;
556 557 boolean_t recursive;
557 558
558 559 /*
559 560 * The header nvlist is of the following format:
560 561 * {
561 562 * "tosnap" -> string
562 563 * "fromsnap" -> string (if incremental)
563 564 * "fss" -> {
564 565 * id -> {
565 566 *
566 567 * "name" -> string (full name; for debugging)
567 568 * "parentfromsnap" -> number (guid of fromsnap in parent)
568 569 *
569 570 * "props" -> { name -> value (only if set here) }
570 571 * "snaps" -> { name (lastname) -> number (guid) }
571 572 * "snapprops" -> { name (lastname) -> { name -> value } }
572 573 *
573 574 * "origin" -> number (guid) (if clone)
574 575 * "sent" -> boolean (not on-disk)
575 576 * }
576 577 * }
577 578 * }
578 579 *
579 580 */
580 581 } send_data_t;
581 582
582 583 static void send_iterate_prop(zfs_handle_t *zhp, nvlist_t *nv);
583 584
584 585 static int
585 586 send_iterate_snap(zfs_handle_t *zhp, void *arg)
586 587 {
587 588 send_data_t *sd = arg;
588 589 uint64_t guid = zhp->zfs_dmustats.dds_guid;
589 590 char *snapname;
590 591 nvlist_t *nv;
591 592
592 593 snapname = strrchr(zhp->zfs_name, '@')+1;
593 594
594 595 VERIFY(0 == nvlist_add_uint64(sd->parent_snaps, snapname, guid));
595 596 /*
596 597 * NB: if there is no fromsnap here (it's a newly created fs in
597 598 * an incremental replication), we will substitute the tosnap.
598 599 */
599 600 if ((sd->fromsnap && strcmp(snapname, sd->fromsnap) == 0) ||
600 601 (sd->parent_fromsnap_guid == 0 && sd->tosnap &&
601 602 strcmp(snapname, sd->tosnap) == 0)) {
602 603 sd->parent_fromsnap_guid = guid;
603 604 }
604 605
605 606 VERIFY(0 == nvlist_alloc(&nv, NV_UNIQUE_NAME, 0));
606 607 send_iterate_prop(zhp, nv);
607 608 VERIFY(0 == nvlist_add_nvlist(sd->snapprops, snapname, nv));
608 609 nvlist_free(nv);
609 610
610 611 zfs_close(zhp);
611 612 return (0);
612 613 }
613 614
614 615 static void
615 616 send_iterate_prop(zfs_handle_t *zhp, nvlist_t *nv)
616 617 {
617 618 nvpair_t *elem = NULL;
618 619
619 620 while ((elem = nvlist_next_nvpair(zhp->zfs_props, elem)) != NULL) {
620 621 char *propname = nvpair_name(elem);
621 622 zfs_prop_t prop = zfs_name_to_prop(propname);
622 623 nvlist_t *propnv;
623 624
624 625 if (!zfs_prop_user(propname)) {
625 626 /*
626 627 * Realistically, this should never happen. However,
627 628 * we want the ability to add DSL properties without
628 629 * needing to make incompatible version changes. We
629 630 * need to ignore unknown properties to allow older
630 631 * software to still send datasets containing these
631 632 * properties, with the unknown properties elided.
632 633 */
633 634 if (prop == ZPROP_INVAL)
634 635 continue;
635 636
636 637 if (zfs_prop_readonly(prop))
637 638 continue;
638 639 }
639 640
640 641 verify(nvpair_value_nvlist(elem, &propnv) == 0);
641 642 if (prop == ZFS_PROP_QUOTA || prop == ZFS_PROP_RESERVATION ||
642 643 prop == ZFS_PROP_REFQUOTA ||
643 644 prop == ZFS_PROP_REFRESERVATION) {
644 645 char *source;
645 646 uint64_t value;
646 647 verify(nvlist_lookup_uint64(propnv,
647 648 ZPROP_VALUE, &value) == 0);
648 649 if (zhp->zfs_type == ZFS_TYPE_SNAPSHOT)
649 650 continue;
650 651 /*
651 652 * May have no source before SPA_VERSION_RECVD_PROPS,
652 653 * but is still modifiable.
653 654 */
654 655 if (nvlist_lookup_string(propnv,
655 656 ZPROP_SOURCE, &source) == 0) {
656 657 if ((strcmp(source, zhp->zfs_name) != 0) &&
657 658 (strcmp(source,
658 659 ZPROP_SOURCE_VAL_RECVD) != 0))
659 660 continue;
660 661 }
661 662 } else {
662 663 char *source;
663 664 if (nvlist_lookup_string(propnv,
664 665 ZPROP_SOURCE, &source) != 0)
665 666 continue;
666 667 if ((strcmp(source, zhp->zfs_name) != 0) &&
667 668 (strcmp(source, ZPROP_SOURCE_VAL_RECVD) != 0))
668 669 continue;
669 670 }
670 671
671 672 if (zfs_prop_user(propname) ||
672 673 zfs_prop_get_type(prop) == PROP_TYPE_STRING) {
673 674 char *value;
674 675 verify(nvlist_lookup_string(propnv,
675 676 ZPROP_VALUE, &value) == 0);
676 677 VERIFY(0 == nvlist_add_string(nv, propname, value));
677 678 } else {
678 679 uint64_t value;
679 680 verify(nvlist_lookup_uint64(propnv,
680 681 ZPROP_VALUE, &value) == 0);
681 682 VERIFY(0 == nvlist_add_uint64(nv, propname, value));
682 683 }
683 684 }
684 685 }
685 686
686 687 /*
687 688 * recursively generate nvlists describing datasets. See comment
688 689 * for the data structure send_data_t above for description of contents
689 690 * of the nvlist.
690 691 */
691 692 static int
692 693 send_iterate_fs(zfs_handle_t *zhp, void *arg)
693 694 {
694 695 send_data_t *sd = arg;
695 696 nvlist_t *nvfs, *nv;
696 697 int rv = 0;
697 698 uint64_t parent_fromsnap_guid_save = sd->parent_fromsnap_guid;
698 699 uint64_t guid = zhp->zfs_dmustats.dds_guid;
699 700 char guidstring[64];
700 701
701 702 VERIFY(0 == nvlist_alloc(&nvfs, NV_UNIQUE_NAME, 0));
702 703 VERIFY(0 == nvlist_add_string(nvfs, "name", zhp->zfs_name));
703 704 VERIFY(0 == nvlist_add_uint64(nvfs, "parentfromsnap",
704 705 sd->parent_fromsnap_guid));
705 706
706 707 if (zhp->zfs_dmustats.dds_origin[0]) {
707 708 zfs_handle_t *origin = zfs_open(zhp->zfs_hdl,
708 709 zhp->zfs_dmustats.dds_origin, ZFS_TYPE_SNAPSHOT);
709 710 if (origin == NULL)
710 711 return (-1);
711 712 VERIFY(0 == nvlist_add_uint64(nvfs, "origin",
712 713 origin->zfs_dmustats.dds_guid));
713 714 }
714 715
715 716 /* iterate over props */
716 717 VERIFY(0 == nvlist_alloc(&nv, NV_UNIQUE_NAME, 0));
717 718 send_iterate_prop(zhp, nv);
718 719 VERIFY(0 == nvlist_add_nvlist(nvfs, "props", nv));
719 720 nvlist_free(nv);
720 721
721 722 /* iterate over snaps, and set sd->parent_fromsnap_guid */
722 723 sd->parent_fromsnap_guid = 0;
723 724 VERIFY(0 == nvlist_alloc(&sd->parent_snaps, NV_UNIQUE_NAME, 0));
724 725 VERIFY(0 == nvlist_alloc(&sd->snapprops, NV_UNIQUE_NAME, 0));
725 726 (void) zfs_iter_snapshots(zhp, send_iterate_snap, sd);
726 727 VERIFY(0 == nvlist_add_nvlist(nvfs, "snaps", sd->parent_snaps));
727 728 VERIFY(0 == nvlist_add_nvlist(nvfs, "snapprops", sd->snapprops));
728 729 nvlist_free(sd->parent_snaps);
729 730 nvlist_free(sd->snapprops);
730 731
731 732 /* add this fs to nvlist */
732 733 (void) snprintf(guidstring, sizeof (guidstring),
733 734 "0x%llx", (longlong_t)guid);
734 735 VERIFY(0 == nvlist_add_nvlist(sd->fss, guidstring, nvfs));
735 736 nvlist_free(nvfs);
736 737
737 738 /* iterate over children */
738 739 if (sd->recursive)
739 740 rv = zfs_iter_filesystems(zhp, send_iterate_fs, sd);
740 741
741 742 sd->parent_fromsnap_guid = parent_fromsnap_guid_save;
742 743
743 744 zfs_close(zhp);
744 745 return (rv);
745 746 }
746 747
747 748 static int
748 749 gather_nvlist(libzfs_handle_t *hdl, const char *fsname, const char *fromsnap,
749 750 const char *tosnap, boolean_t recursive, nvlist_t **nvlp, avl_tree_t **avlp)
750 751 {
751 752 zfs_handle_t *zhp;
752 753 send_data_t sd = { 0 };
753 754 int error;
754 755
755 756 zhp = zfs_open(hdl, fsname, ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME);
756 757 if (zhp == NULL)
757 758 return (EZFS_BADTYPE);
758 759
759 760 VERIFY(0 == nvlist_alloc(&sd.fss, NV_UNIQUE_NAME, 0));
760 761 sd.fromsnap = fromsnap;
761 762 sd.tosnap = tosnap;
762 763 sd.recursive = recursive;
763 764
764 765 if ((error = send_iterate_fs(zhp, &sd)) != 0) {
765 766 nvlist_free(sd.fss);
766 767 if (avlp != NULL)
767 768 *avlp = NULL;
768 769 *nvlp = NULL;
769 770 return (error);
770 771 }
771 772
772 773 if (avlp != NULL && (*avlp = fsavl_create(sd.fss)) == NULL) {
773 774 nvlist_free(sd.fss);
774 775 *nvlp = NULL;
775 776 return (EZFS_NOMEM);
776 777 }
777 778
778 779 *nvlp = sd.fss;
779 780 return (0);
780 781 }
781 782
782 783 /*
783 784 * Routines specific to "zfs send"
784 785 */
785 786 typedef struct send_dump_data {
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786 787 /* these are all just the short snapname (the part after the @) */
787 788 const char *fromsnap;
788 789 const char *tosnap;
789 790 char prevsnap[ZFS_MAXNAMELEN];
790 791 uint64_t prevsnap_obj;
791 792 boolean_t seenfrom, seento, replicate, doall, fromorigin;
792 793 boolean_t verbose, dryrun, parsable, progress;
793 794 int outfd;
794 795 boolean_t err;
795 796 nvlist_t *fss;
797 + nvlist_t *snapholds;
796 798 avl_tree_t *fsavl;
797 799 snapfilter_cb_t *filter_cb;
798 800 void *filter_cb_arg;
799 801 nvlist_t *debugnv;
800 802 char holdtag[ZFS_MAXNAMELEN];
801 803 int cleanup_fd;
802 804 uint64_t size;
803 805 } send_dump_data_t;
804 806
805 807 static int
806 808 estimate_ioctl(zfs_handle_t *zhp, uint64_t fromsnap_obj,
807 809 boolean_t fromorigin, uint64_t *sizep)
808 810 {
809 811 zfs_cmd_t zc = { 0 };
810 812 libzfs_handle_t *hdl = zhp->zfs_hdl;
811 813
812 814 assert(zhp->zfs_type == ZFS_TYPE_SNAPSHOT);
813 815 assert(fromsnap_obj == 0 || !fromorigin);
814 816
815 817 (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
816 818 zc.zc_obj = fromorigin;
817 819 zc.zc_sendobj = zfs_prop_get_int(zhp, ZFS_PROP_OBJSETID);
818 820 zc.zc_fromobj = fromsnap_obj;
819 821 zc.zc_guid = 1; /* estimate flag */
820 822
821 823 if (zfs_ioctl(zhp->zfs_hdl, ZFS_IOC_SEND, &zc) != 0) {
822 824 char errbuf[1024];
823 825 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
824 826 "warning: cannot estimate space for '%s'"), zhp->zfs_name);
825 827
826 828 switch (errno) {
827 829 case EXDEV:
828 830 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
829 831 "not an earlier snapshot from the same fs"));
830 832 return (zfs_error(hdl, EZFS_CROSSTARGET, errbuf));
831 833
832 834 case ENOENT:
833 835 if (zfs_dataset_exists(hdl, zc.zc_name,
834 836 ZFS_TYPE_SNAPSHOT)) {
835 837 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
836 838 "incremental source (@%s) does not exist"),
837 839 zc.zc_value);
838 840 }
839 841 return (zfs_error(hdl, EZFS_NOENT, errbuf));
840 842
841 843 case EDQUOT:
842 844 case EFBIG:
843 845 case EIO:
844 846 case ENOLINK:
845 847 case ENOSPC:
846 848 case ENOSTR:
847 849 case ENXIO:
848 850 case EPIPE:
849 851 case ERANGE:
850 852 case EFAULT:
851 853 case EROFS:
852 854 zfs_error_aux(hdl, strerror(errno));
853 855 return (zfs_error(hdl, EZFS_BADBACKUP, errbuf));
854 856
855 857 default:
856 858 return (zfs_standard_error(hdl, errno, errbuf));
857 859 }
858 860 }
859 861
860 862 *sizep = zc.zc_objset_type;
861 863
862 864 return (0);
863 865 }
864 866
865 867 /*
866 868 * Dumps a backup of the given snapshot (incremental from fromsnap if it's not
867 869 * NULL) to the file descriptor specified by outfd.
868 870 */
869 871 static int
870 872 dump_ioctl(zfs_handle_t *zhp, const char *fromsnap, uint64_t fromsnap_obj,
871 873 boolean_t fromorigin, int outfd, nvlist_t *debugnv)
872 874 {
873 875 zfs_cmd_t zc = { 0 };
874 876 libzfs_handle_t *hdl = zhp->zfs_hdl;
875 877 nvlist_t *thisdbg;
876 878
877 879 assert(zhp->zfs_type == ZFS_TYPE_SNAPSHOT);
878 880 assert(fromsnap_obj == 0 || !fromorigin);
879 881
880 882 (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
881 883 zc.zc_cookie = outfd;
882 884 zc.zc_obj = fromorigin;
883 885 zc.zc_sendobj = zfs_prop_get_int(zhp, ZFS_PROP_OBJSETID);
884 886 zc.zc_fromobj = fromsnap_obj;
885 887
886 888 VERIFY(0 == nvlist_alloc(&thisdbg, NV_UNIQUE_NAME, 0));
887 889 if (fromsnap && fromsnap[0] != '\0') {
888 890 VERIFY(0 == nvlist_add_string(thisdbg,
889 891 "fromsnap", fromsnap));
890 892 }
891 893
892 894 if (zfs_ioctl(zhp->zfs_hdl, ZFS_IOC_SEND, &zc) != 0) {
893 895 char errbuf[1024];
894 896 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
895 897 "warning: cannot send '%s'"), zhp->zfs_name);
896 898
897 899 VERIFY(0 == nvlist_add_uint64(thisdbg, "error", errno));
898 900 if (debugnv) {
899 901 VERIFY(0 == nvlist_add_nvlist(debugnv,
900 902 zhp->zfs_name, thisdbg));
901 903 }
902 904 nvlist_free(thisdbg);
903 905
904 906 switch (errno) {
905 907 case EXDEV:
906 908 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
907 909 "not an earlier snapshot from the same fs"));
908 910 return (zfs_error(hdl, EZFS_CROSSTARGET, errbuf));
909 911
910 912 case ENOENT:
911 913 if (zfs_dataset_exists(hdl, zc.zc_name,
912 914 ZFS_TYPE_SNAPSHOT)) {
913 915 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
914 916 "incremental source (@%s) does not exist"),
915 917 zc.zc_value);
916 918 }
917 919 return (zfs_error(hdl, EZFS_NOENT, errbuf));
918 920
919 921 case EDQUOT:
920 922 case EFBIG:
921 923 case EIO:
922 924 case ENOLINK:
923 925 case ENOSPC:
924 926 case ENOSTR:
925 927 case ENXIO:
926 928 case EPIPE:
927 929 case ERANGE:
928 930 case EFAULT:
929 931 case EROFS:
930 932 zfs_error_aux(hdl, strerror(errno));
931 933 return (zfs_error(hdl, EZFS_BADBACKUP, errbuf));
932 934
933 935 default:
934 936 return (zfs_standard_error(hdl, errno, errbuf));
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935 937 }
936 938 }
937 939
938 940 if (debugnv)
939 941 VERIFY(0 == nvlist_add_nvlist(debugnv, zhp->zfs_name, thisdbg));
940 942 nvlist_free(thisdbg);
941 943
942 944 return (0);
943 945 }
944 946
945 -static int
946 -hold_for_send(zfs_handle_t *zhp, send_dump_data_t *sdd)
947 +static void
948 +gather_holds(zfs_handle_t *zhp, send_dump_data_t *sdd)
947 949 {
948 - zfs_handle_t *pzhp;
949 - int error = 0;
950 - char *thissnap;
951 -
952 950 assert(zhp->zfs_type == ZFS_TYPE_SNAPSHOT);
953 951
954 - if (sdd->dryrun)
955 - return (0);
956 -
957 952 /*
958 - * zfs_send() only opens a cleanup_fd for sends that need it,
953 + * zfs_send() only sets snapholds for sends that need them,
959 954 * e.g. replication and doall.
960 955 */
961 - if (sdd->cleanup_fd == -1)
962 - return (0);
963 -
964 - thissnap = strchr(zhp->zfs_name, '@') + 1;
965 - *(thissnap - 1) = '\0';
966 - pzhp = zfs_open(zhp->zfs_hdl, zhp->zfs_name, ZFS_TYPE_DATASET);
967 - *(thissnap - 1) = '@';
968 -
969 - /*
970 - * It's OK if the parent no longer exists. The send code will
971 - * handle that error.
972 - */
973 - if (pzhp) {
974 - error = zfs_hold(pzhp, thissnap, sdd->holdtag,
975 - B_FALSE, B_TRUE, sdd->cleanup_fd);
976 - zfs_close(pzhp);
977 - }
956 + if (sdd->snapholds == NULL)
957 + return;
978 958
979 - return (error);
959 + fnvlist_add_string(sdd->snapholds, zhp->zfs_name, sdd->holdtag);
980 960 }
981 961
982 962 static void *
983 963 send_progress_thread(void *arg)
984 964 {
985 965 progress_arg_t *pa = arg;
986 966
987 967 zfs_cmd_t zc = { 0 };
988 968 zfs_handle_t *zhp = pa->pa_zhp;
989 969 libzfs_handle_t *hdl = zhp->zfs_hdl;
990 970 unsigned long long bytes;
991 971 char buf[16];
992 972
993 973 time_t t;
994 974 struct tm *tm;
995 975
996 976 assert(zhp->zfs_type == ZFS_TYPE_SNAPSHOT);
997 977 (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
998 978
999 979 if (!pa->pa_parsable)
1000 980 (void) fprintf(stderr, "TIME SENT SNAPSHOT\n");
1001 981
1002 982 /*
1003 983 * Print the progress from ZFS_IOC_SEND_PROGRESS every second.
1004 984 */
1005 985 for (;;) {
1006 986 (void) sleep(1);
1007 987
1008 988 zc.zc_cookie = pa->pa_fd;
1009 989 if (zfs_ioctl(hdl, ZFS_IOC_SEND_PROGRESS, &zc) != 0)
1010 990 return ((void *)-1);
1011 991
1012 992 (void) time(&t);
1013 993 tm = localtime(&t);
1014 994 bytes = zc.zc_cookie;
1015 995
1016 996 if (pa->pa_parsable) {
1017 997 (void) fprintf(stderr, "%02d:%02d:%02d\t%llu\t%s\n",
1018 998 tm->tm_hour, tm->tm_min, tm->tm_sec,
1019 999 bytes, zhp->zfs_name);
1020 1000 } else {
1021 1001 zfs_nicenum(bytes, buf, sizeof (buf));
1022 1002 (void) fprintf(stderr, "%02d:%02d:%02d %5s %s\n",
1023 1003 tm->tm_hour, tm->tm_min, tm->tm_sec,
1024 1004 buf, zhp->zfs_name);
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1025 1005 }
1026 1006 }
1027 1007 }
1028 1008
1029 1009 static int
1030 1010 dump_snapshot(zfs_handle_t *zhp, void *arg)
1031 1011 {
1032 1012 send_dump_data_t *sdd = arg;
1033 1013 progress_arg_t pa = { 0 };
1034 1014 pthread_t tid;
1035 -
1036 1015 char *thissnap;
1037 1016 int err;
1038 1017 boolean_t isfromsnap, istosnap, fromorigin;
1039 1018 boolean_t exclude = B_FALSE;
1040 1019
1020 + err = 0;
1041 1021 thissnap = strchr(zhp->zfs_name, '@') + 1;
1042 1022 isfromsnap = (sdd->fromsnap != NULL &&
1043 1023 strcmp(sdd->fromsnap, thissnap) == 0);
1044 1024
1045 1025 if (!sdd->seenfrom && isfromsnap) {
1046 - err = hold_for_send(zhp, sdd);
1047 - if (err == 0) {
1048 - sdd->seenfrom = B_TRUE;
1049 - (void) strcpy(sdd->prevsnap, thissnap);
1050 - sdd->prevsnap_obj = zfs_prop_get_int(zhp,
1051 - ZFS_PROP_OBJSETID);
1052 - } else if (err == ENOENT) {
1053 - err = 0;
1054 - }
1026 + gather_holds(zhp, sdd);
1027 + sdd->seenfrom = B_TRUE;
1028 + (void) strcpy(sdd->prevsnap, thissnap);
1029 + sdd->prevsnap_obj = zfs_prop_get_int(zhp, ZFS_PROP_OBJSETID);
1055 1030 zfs_close(zhp);
1056 - return (err);
1031 + return (0);
1057 1032 }
1058 1033
1059 1034 if (sdd->seento || !sdd->seenfrom) {
1060 1035 zfs_close(zhp);
1061 1036 return (0);
1062 1037 }
1063 1038
1064 1039 istosnap = (strcmp(sdd->tosnap, thissnap) == 0);
1065 1040 if (istosnap)
1066 1041 sdd->seento = B_TRUE;
1067 1042
1068 1043 if (!sdd->doall && !isfromsnap && !istosnap) {
1069 1044 if (sdd->replicate) {
1070 1045 char *snapname;
1071 1046 nvlist_t *snapprops;
1072 1047 /*
1073 1048 * Filter out all intermediate snapshots except origin
1074 1049 * snapshots needed to replicate clones.
1075 1050 */
1076 1051 nvlist_t *nvfs = fsavl_find(sdd->fsavl,
1077 1052 zhp->zfs_dmustats.dds_guid, &snapname);
1078 1053
1079 1054 VERIFY(0 == nvlist_lookup_nvlist(nvfs,
1080 1055 "snapprops", &snapprops));
1081 1056 VERIFY(0 == nvlist_lookup_nvlist(snapprops,
1082 1057 thissnap, &snapprops));
1083 1058 exclude = !nvlist_exists(snapprops, "is_clone_origin");
1084 1059 } else {
1085 1060 exclude = B_TRUE;
1086 1061 }
1087 1062 }
1088 1063
1089 1064 /*
1090 1065 * If a filter function exists, call it to determine whether
1091 1066 * this snapshot will be sent.
1092 1067 */
1093 1068 if (exclude || (sdd->filter_cb != NULL &&
1094 1069 sdd->filter_cb(zhp, sdd->filter_cb_arg) == B_FALSE)) {
1095 1070 /*
1096 1071 * This snapshot is filtered out. Don't send it, and don't
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1097 1072 * set prevsnap_obj, so it will be as if this snapshot didn't
1098 1073 * exist, and the next accepted snapshot will be sent as
1099 1074 * an incremental from the last accepted one, or as the
1100 1075 * first (and full) snapshot in the case of a replication,
1101 1076 * non-incremental send.
1102 1077 */
1103 1078 zfs_close(zhp);
1104 1079 return (0);
1105 1080 }
1106 1081
1107 - err = hold_for_send(zhp, sdd);
1108 - if (err) {
1109 - if (err == ENOENT)
1110 - err = 0;
1111 - zfs_close(zhp);
1112 - return (err);
1113 - }
1114 -
1082 + gather_holds(zhp, sdd);
1115 1083 fromorigin = sdd->prevsnap[0] == '\0' &&
1116 1084 (sdd->fromorigin || sdd->replicate);
1117 1085
1118 1086 if (sdd->verbose) {
1119 1087 uint64_t size;
1120 1088 err = estimate_ioctl(zhp, sdd->prevsnap_obj,
1121 1089 fromorigin, &size);
1122 1090
1123 1091 if (sdd->parsable) {
1124 1092 if (sdd->prevsnap[0] != '\0') {
1125 1093 (void) fprintf(stderr, "incremental\t%s\t%s",
1126 1094 sdd->prevsnap, zhp->zfs_name);
1127 1095 } else {
1128 1096 (void) fprintf(stderr, "full\t%s",
1129 1097 zhp->zfs_name);
1130 1098 }
1131 1099 } else {
1132 1100 (void) fprintf(stderr, dgettext(TEXT_DOMAIN,
1133 1101 "send from @%s to %s"),
1134 1102 sdd->prevsnap, zhp->zfs_name);
1135 1103 }
1136 1104 if (err == 0) {
1137 1105 if (sdd->parsable) {
1138 1106 (void) fprintf(stderr, "\t%llu\n",
1139 1107 (longlong_t)size);
1140 1108 } else {
1141 1109 char buf[16];
1142 1110 zfs_nicenum(size, buf, sizeof (buf));
1143 1111 (void) fprintf(stderr, dgettext(TEXT_DOMAIN,
1144 1112 " estimated size is %s\n"), buf);
1145 1113 }
1146 1114 sdd->size += size;
1147 1115 } else {
1148 1116 (void) fprintf(stderr, "\n");
1149 1117 }
1150 1118 }
1151 1119
1152 1120 if (!sdd->dryrun) {
1153 1121 /*
1154 1122 * If progress reporting is requested, spawn a new thread to
1155 1123 * poll ZFS_IOC_SEND_PROGRESS at a regular interval.
1156 1124 */
1157 1125 if (sdd->progress) {
1158 1126 pa.pa_zhp = zhp;
1159 1127 pa.pa_fd = sdd->outfd;
1160 1128 pa.pa_parsable = sdd->parsable;
1161 1129
1162 1130 if (err = pthread_create(&tid, NULL,
1163 1131 send_progress_thread, &pa)) {
1164 1132 zfs_close(zhp);
1165 1133 return (err);
1166 1134 }
1167 1135 }
1168 1136
1169 1137 err = dump_ioctl(zhp, sdd->prevsnap, sdd->prevsnap_obj,
1170 1138 fromorigin, sdd->outfd, sdd->debugnv);
1171 1139
1172 1140 if (sdd->progress) {
1173 1141 (void) pthread_cancel(tid);
1174 1142 (void) pthread_join(tid, NULL);
1175 1143 }
1176 1144 }
1177 1145
1178 1146 (void) strcpy(sdd->prevsnap, thissnap);
1179 1147 sdd->prevsnap_obj = zfs_prop_get_int(zhp, ZFS_PROP_OBJSETID);
1180 1148 zfs_close(zhp);
1181 1149 return (err);
1182 1150 }
1183 1151
1184 1152 static int
1185 1153 dump_filesystem(zfs_handle_t *zhp, void *arg)
1186 1154 {
1187 1155 int rv = 0;
1188 1156 send_dump_data_t *sdd = arg;
1189 1157 boolean_t missingfrom = B_FALSE;
1190 1158 zfs_cmd_t zc = { 0 };
1191 1159
1192 1160 (void) snprintf(zc.zc_name, sizeof (zc.zc_name), "%s@%s",
1193 1161 zhp->zfs_name, sdd->tosnap);
1194 1162 if (ioctl(zhp->zfs_hdl->libzfs_fd, ZFS_IOC_OBJSET_STATS, &zc) != 0) {
1195 1163 (void) fprintf(stderr, dgettext(TEXT_DOMAIN,
1196 1164 "WARNING: could not send %s@%s: does not exist\n"),
1197 1165 zhp->zfs_name, sdd->tosnap);
1198 1166 sdd->err = B_TRUE;
1199 1167 return (0);
1200 1168 }
1201 1169
1202 1170 if (sdd->replicate && sdd->fromsnap) {
1203 1171 /*
1204 1172 * If this fs does not have fromsnap, and we're doing
1205 1173 * recursive, we need to send a full stream from the
1206 1174 * beginning (or an incremental from the origin if this
1207 1175 * is a clone). If we're doing non-recursive, then let
1208 1176 * them get the error.
1209 1177 */
1210 1178 (void) snprintf(zc.zc_name, sizeof (zc.zc_name), "%s@%s",
1211 1179 zhp->zfs_name, sdd->fromsnap);
1212 1180 if (ioctl(zhp->zfs_hdl->libzfs_fd,
1213 1181 ZFS_IOC_OBJSET_STATS, &zc) != 0) {
1214 1182 missingfrom = B_TRUE;
1215 1183 }
1216 1184 }
1217 1185
1218 1186 sdd->seenfrom = sdd->seento = sdd->prevsnap[0] = 0;
1219 1187 sdd->prevsnap_obj = 0;
1220 1188 if (sdd->fromsnap == NULL || missingfrom)
1221 1189 sdd->seenfrom = B_TRUE;
1222 1190
1223 1191 rv = zfs_iter_snapshots_sorted(zhp, dump_snapshot, arg);
1224 1192 if (!sdd->seenfrom) {
1225 1193 (void) fprintf(stderr, dgettext(TEXT_DOMAIN,
1226 1194 "WARNING: could not send %s@%s:\n"
1227 1195 "incremental source (%s@%s) does not exist\n"),
1228 1196 zhp->zfs_name, sdd->tosnap,
1229 1197 zhp->zfs_name, sdd->fromsnap);
1230 1198 sdd->err = B_TRUE;
1231 1199 } else if (!sdd->seento) {
1232 1200 if (sdd->fromsnap) {
1233 1201 (void) fprintf(stderr, dgettext(TEXT_DOMAIN,
1234 1202 "WARNING: could not send %s@%s:\n"
1235 1203 "incremental source (%s@%s) "
1236 1204 "is not earlier than it\n"),
1237 1205 zhp->zfs_name, sdd->tosnap,
1238 1206 zhp->zfs_name, sdd->fromsnap);
1239 1207 } else {
1240 1208 (void) fprintf(stderr, dgettext(TEXT_DOMAIN,
1241 1209 "WARNING: "
1242 1210 "could not send %s@%s: does not exist\n"),
1243 1211 zhp->zfs_name, sdd->tosnap);
1244 1212 }
1245 1213 sdd->err = B_TRUE;
1246 1214 }
1247 1215
1248 1216 return (rv);
1249 1217 }
1250 1218
1251 1219 static int
1252 1220 dump_filesystems(zfs_handle_t *rzhp, void *arg)
1253 1221 {
1254 1222 send_dump_data_t *sdd = arg;
1255 1223 nvpair_t *fspair;
1256 1224 boolean_t needagain, progress;
1257 1225
1258 1226 if (!sdd->replicate)
1259 1227 return (dump_filesystem(rzhp, sdd));
1260 1228
1261 1229 /* Mark the clone origin snapshots. */
1262 1230 for (fspair = nvlist_next_nvpair(sdd->fss, NULL); fspair;
1263 1231 fspair = nvlist_next_nvpair(sdd->fss, fspair)) {
1264 1232 nvlist_t *nvfs;
1265 1233 uint64_t origin_guid = 0;
1266 1234
1267 1235 VERIFY(0 == nvpair_value_nvlist(fspair, &nvfs));
1268 1236 (void) nvlist_lookup_uint64(nvfs, "origin", &origin_guid);
1269 1237 if (origin_guid != 0) {
1270 1238 char *snapname;
1271 1239 nvlist_t *origin_nv = fsavl_find(sdd->fsavl,
1272 1240 origin_guid, &snapname);
1273 1241 if (origin_nv != NULL) {
1274 1242 nvlist_t *snapprops;
1275 1243 VERIFY(0 == nvlist_lookup_nvlist(origin_nv,
1276 1244 "snapprops", &snapprops));
1277 1245 VERIFY(0 == nvlist_lookup_nvlist(snapprops,
1278 1246 snapname, &snapprops));
1279 1247 VERIFY(0 == nvlist_add_boolean(
1280 1248 snapprops, "is_clone_origin"));
1281 1249 }
1282 1250 }
1283 1251 }
1284 1252 again:
1285 1253 needagain = progress = B_FALSE;
1286 1254 for (fspair = nvlist_next_nvpair(sdd->fss, NULL); fspair;
1287 1255 fspair = nvlist_next_nvpair(sdd->fss, fspair)) {
1288 1256 nvlist_t *fslist, *parent_nv;
1289 1257 char *fsname;
1290 1258 zfs_handle_t *zhp;
1291 1259 int err;
1292 1260 uint64_t origin_guid = 0;
1293 1261 uint64_t parent_guid = 0;
1294 1262
1295 1263 VERIFY(nvpair_value_nvlist(fspair, &fslist) == 0);
1296 1264 if (nvlist_lookup_boolean(fslist, "sent") == 0)
1297 1265 continue;
1298 1266
1299 1267 VERIFY(nvlist_lookup_string(fslist, "name", &fsname) == 0);
1300 1268 (void) nvlist_lookup_uint64(fslist, "origin", &origin_guid);
1301 1269 (void) nvlist_lookup_uint64(fslist, "parentfromsnap",
1302 1270 &parent_guid);
1303 1271
1304 1272 if (parent_guid != 0) {
1305 1273 parent_nv = fsavl_find(sdd->fsavl, parent_guid, NULL);
1306 1274 if (!nvlist_exists(parent_nv, "sent")) {
1307 1275 /* parent has not been sent; skip this one */
1308 1276 needagain = B_TRUE;
1309 1277 continue;
1310 1278 }
1311 1279 }
1312 1280
1313 1281 if (origin_guid != 0) {
1314 1282 nvlist_t *origin_nv = fsavl_find(sdd->fsavl,
1315 1283 origin_guid, NULL);
1316 1284 if (origin_nv != NULL &&
1317 1285 !nvlist_exists(origin_nv, "sent")) {
1318 1286 /*
1319 1287 * origin has not been sent yet;
1320 1288 * skip this clone.
1321 1289 */
1322 1290 needagain = B_TRUE;
1323 1291 continue;
1324 1292 }
1325 1293 }
1326 1294
1327 1295 zhp = zfs_open(rzhp->zfs_hdl, fsname, ZFS_TYPE_DATASET);
1328 1296 if (zhp == NULL)
1329 1297 return (-1);
1330 1298 err = dump_filesystem(zhp, sdd);
1331 1299 VERIFY(nvlist_add_boolean(fslist, "sent") == 0);
1332 1300 progress = B_TRUE;
1333 1301 zfs_close(zhp);
1334 1302 if (err)
1335 1303 return (err);
1336 1304 }
1337 1305 if (needagain) {
1338 1306 assert(progress);
1339 1307 goto again;
1340 1308 }
1341 1309
1342 1310 /* clean out the sent flags in case we reuse this fss */
1343 1311 for (fspair = nvlist_next_nvpair(sdd->fss, NULL); fspair;
1344 1312 fspair = nvlist_next_nvpair(sdd->fss, fspair)) {
1345 1313 nvlist_t *fslist;
1346 1314
1347 1315 VERIFY(nvpair_value_nvlist(fspair, &fslist) == 0);
1348 1316 (void) nvlist_remove_all(fslist, "sent");
1349 1317 }
1350 1318
1351 1319 return (0);
1352 1320 }
1353 1321
1354 1322 /*
1355 1323 * Generate a send stream for the dataset identified by the argument zhp.
1356 1324 *
1357 1325 * The content of the send stream is the snapshot identified by
1358 1326 * 'tosnap'. Incremental streams are requested in two ways:
1359 1327 * - from the snapshot identified by "fromsnap" (if non-null) or
1360 1328 * - from the origin of the dataset identified by zhp, which must
1361 1329 * be a clone. In this case, "fromsnap" is null and "fromorigin"
1362 1330 * is TRUE.
1363 1331 *
1364 1332 * The send stream is recursive (i.e. dumps a hierarchy of snapshots) and
1365 1333 * uses a special header (with a hdrtype field of DMU_COMPOUNDSTREAM)
1366 1334 * if "replicate" is set. If "doall" is set, dump all the intermediate
1367 1335 * snapshots. The DMU_COMPOUNDSTREAM header is used in the "doall"
1368 1336 * case too. If "props" is set, send properties.
1369 1337 */
1370 1338 int
1371 1339 zfs_send(zfs_handle_t *zhp, const char *fromsnap, const char *tosnap,
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1372 1340 sendflags_t *flags, int outfd, snapfilter_cb_t filter_func,
1373 1341 void *cb_arg, nvlist_t **debugnvp)
1374 1342 {
1375 1343 char errbuf[1024];
1376 1344 send_dump_data_t sdd = { 0 };
1377 1345 int err = 0;
1378 1346 nvlist_t *fss = NULL;
1379 1347 avl_tree_t *fsavl = NULL;
1380 1348 static uint64_t holdseq;
1381 1349 int spa_version;
1382 - pthread_t tid;
1350 + pthread_t tid = 0;
1383 1351 int pipefd[2];
1384 1352 dedup_arg_t dda = { 0 };
1385 1353 int featureflags = 0;
1386 1354
1387 1355 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
1388 1356 "cannot send '%s'"), zhp->zfs_name);
1389 1357
1390 1358 if (fromsnap && fromsnap[0] == '\0') {
1391 1359 zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN,
1392 1360 "zero-length incremental source"));
1393 1361 return (zfs_error(zhp->zfs_hdl, EZFS_NOENT, errbuf));
1394 1362 }
1395 1363
1396 1364 if (zhp->zfs_type == ZFS_TYPE_FILESYSTEM) {
1397 1365 uint64_t version;
1398 1366 version = zfs_prop_get_int(zhp, ZFS_PROP_VERSION);
1399 1367 if (version >= ZPL_VERSION_SA) {
1400 1368 featureflags |= DMU_BACKUP_FEATURE_SA_SPILL;
1401 1369 }
1402 1370 }
1403 1371
1404 1372 if (flags->dedup && !flags->dryrun) {
1405 1373 featureflags |= (DMU_BACKUP_FEATURE_DEDUP |
1406 1374 DMU_BACKUP_FEATURE_DEDUPPROPS);
1407 1375 if (err = pipe(pipefd)) {
1408 1376 zfs_error_aux(zhp->zfs_hdl, strerror(errno));
1409 1377 return (zfs_error(zhp->zfs_hdl, EZFS_PIPEFAILED,
1410 1378 errbuf));
1411 1379 }
1412 1380 dda.outputfd = outfd;
1413 1381 dda.inputfd = pipefd[1];
1414 1382 dda.dedup_hdl = zhp->zfs_hdl;
1415 1383 if (err = pthread_create(&tid, NULL, cksummer, &dda)) {
1416 1384 (void) close(pipefd[0]);
1417 1385 (void) close(pipefd[1]);
1418 1386 zfs_error_aux(zhp->zfs_hdl, strerror(errno));
1419 1387 return (zfs_error(zhp->zfs_hdl,
1420 1388 EZFS_THREADCREATEFAILED, errbuf));
1421 1389 }
1422 1390 }
1423 1391
1424 1392 if (flags->replicate || flags->doall || flags->props) {
1425 1393 dmu_replay_record_t drr = { 0 };
1426 1394 char *packbuf = NULL;
1427 1395 size_t buflen = 0;
1428 1396 zio_cksum_t zc = { 0 };
1429 1397
1430 1398 if (flags->replicate || flags->props) {
1431 1399 nvlist_t *hdrnv;
1432 1400
1433 1401 VERIFY(0 == nvlist_alloc(&hdrnv, NV_UNIQUE_NAME, 0));
1434 1402 if (fromsnap) {
1435 1403 VERIFY(0 == nvlist_add_string(hdrnv,
1436 1404 "fromsnap", fromsnap));
1437 1405 }
1438 1406 VERIFY(0 == nvlist_add_string(hdrnv, "tosnap", tosnap));
1439 1407 if (!flags->replicate) {
1440 1408 VERIFY(0 == nvlist_add_boolean(hdrnv,
1441 1409 "not_recursive"));
1442 1410 }
1443 1411
1444 1412 err = gather_nvlist(zhp->zfs_hdl, zhp->zfs_name,
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1445 1413 fromsnap, tosnap, flags->replicate, &fss, &fsavl);
1446 1414 if (err)
1447 1415 goto err_out;
1448 1416 VERIFY(0 == nvlist_add_nvlist(hdrnv, "fss", fss));
1449 1417 err = nvlist_pack(hdrnv, &packbuf, &buflen,
1450 1418 NV_ENCODE_XDR, 0);
1451 1419 if (debugnvp)
1452 1420 *debugnvp = hdrnv;
1453 1421 else
1454 1422 nvlist_free(hdrnv);
1455 - if (err) {
1456 - fsavl_destroy(fsavl);
1457 - nvlist_free(fss);
1423 + if (err)
1458 1424 goto stderr_out;
1459 - }
1460 1425 }
1461 1426
1462 1427 if (!flags->dryrun) {
1463 1428 /* write first begin record */
1464 1429 drr.drr_type = DRR_BEGIN;
1465 1430 drr.drr_u.drr_begin.drr_magic = DMU_BACKUP_MAGIC;
1466 1431 DMU_SET_STREAM_HDRTYPE(drr.drr_u.drr_begin.
1467 1432 drr_versioninfo, DMU_COMPOUNDSTREAM);
1468 1433 DMU_SET_FEATUREFLAGS(drr.drr_u.drr_begin.
1469 1434 drr_versioninfo, featureflags);
1470 1435 (void) snprintf(drr.drr_u.drr_begin.drr_toname,
1471 1436 sizeof (drr.drr_u.drr_begin.drr_toname),
1472 1437 "%s@%s", zhp->zfs_name, tosnap);
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1473 1438 drr.drr_payloadlen = buflen;
1474 1439 err = cksum_and_write(&drr, sizeof (drr), &zc, outfd);
1475 1440
1476 1441 /* write header nvlist */
1477 1442 if (err != -1 && packbuf != NULL) {
1478 1443 err = cksum_and_write(packbuf, buflen, &zc,
1479 1444 outfd);
1480 1445 }
1481 1446 free(packbuf);
1482 1447 if (err == -1) {
1483 - fsavl_destroy(fsavl);
1484 - nvlist_free(fss);
1485 1448 err = errno;
1486 1449 goto stderr_out;
1487 1450 }
1488 1451
1489 1452 /* write end record */
1490 1453 bzero(&drr, sizeof (drr));
1491 1454 drr.drr_type = DRR_END;
1492 1455 drr.drr_u.drr_end.drr_checksum = zc;
1493 1456 err = write(outfd, &drr, sizeof (drr));
1494 1457 if (err == -1) {
1495 - fsavl_destroy(fsavl);
1496 - nvlist_free(fss);
1497 1458 err = errno;
1498 1459 goto stderr_out;
1499 1460 }
1500 1461
1501 1462 err = 0;
1502 1463 }
1503 1464 }
1504 1465
1505 1466 /* dump each stream */
1506 1467 sdd.fromsnap = fromsnap;
1507 1468 sdd.tosnap = tosnap;
1508 - if (flags->dedup)
1469 + if (tid != 0)
1509 1470 sdd.outfd = pipefd[0];
1510 1471 else
1511 1472 sdd.outfd = outfd;
1512 1473 sdd.replicate = flags->replicate;
1513 1474 sdd.doall = flags->doall;
1514 1475 sdd.fromorigin = flags->fromorigin;
1515 1476 sdd.fss = fss;
1516 1477 sdd.fsavl = fsavl;
1517 1478 sdd.verbose = flags->verbose;
1518 1479 sdd.parsable = flags->parsable;
1519 1480 sdd.progress = flags->progress;
1520 1481 sdd.dryrun = flags->dryrun;
1521 1482 sdd.filter_cb = filter_func;
1522 1483 sdd.filter_cb_arg = cb_arg;
1523 1484 if (debugnvp)
1524 1485 sdd.debugnv = *debugnvp;
1525 1486
1526 1487 /*
1527 1488 * Some flags require that we place user holds on the datasets that are
1528 1489 * being sent so they don't get destroyed during the send. We can skip
1529 1490 * this step if the pool is imported read-only since the datasets cannot
1530 1491 * be destroyed.
1531 1492 */
1532 1493 if (!flags->dryrun && !zpool_get_prop_int(zfs_get_pool_handle(zhp),
1533 1494 ZPOOL_PROP_READONLY, NULL) &&
1534 1495 zfs_spa_version(zhp, &spa_version) == 0 &&
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1535 1496 spa_version >= SPA_VERSION_USERREFS &&
1536 1497 (flags->doall || flags->replicate)) {
1537 1498 ++holdseq;
1538 1499 (void) snprintf(sdd.holdtag, sizeof (sdd.holdtag),
1539 1500 ".send-%d-%llu", getpid(), (u_longlong_t)holdseq);
1540 1501 sdd.cleanup_fd = open(ZFS_DEV, O_RDWR|O_EXCL);
1541 1502 if (sdd.cleanup_fd < 0) {
1542 1503 err = errno;
1543 1504 goto stderr_out;
1544 1505 }
1506 + sdd.snapholds = fnvlist_alloc();
1545 1507 } else {
1546 1508 sdd.cleanup_fd = -1;
1509 + sdd.snapholds = NULL;
1547 1510 }
1548 - if (flags->verbose) {
1511 + if (flags->verbose || sdd.snapholds != NULL) {
1549 1512 /*
1550 1513 * Do a verbose no-op dry run to get all the verbose output
1551 - * before generating any data. Then do a non-verbose real
1552 - * run to generate the streams.
1514 + * or to gather snapshot hold's before generating any data,
1515 + * then do a non-verbose real run to generate the streams.
1553 1516 */
1554 1517 sdd.dryrun = B_TRUE;
1555 1518 err = dump_filesystems(zhp, &sdd);
1556 - sdd.dryrun = flags->dryrun;
1557 - sdd.verbose = B_FALSE;
1558 - if (flags->parsable) {
1559 - (void) fprintf(stderr, "size\t%llu\n",
1560 - (longlong_t)sdd.size);
1561 - } else {
1562 - char buf[16];
1563 - zfs_nicenum(sdd.size, buf, sizeof (buf));
1564 - (void) fprintf(stderr, dgettext(TEXT_DOMAIN,
1565 - "total estimated size is %s\n"), buf);
1519 +
1520 + if (err != 0)
1521 + goto stderr_out;
1522 +
1523 + if (flags->verbose) {
1524 + if (flags->parsable) {
1525 + (void) fprintf(stderr, "size\t%llu\n",
1526 + (longlong_t)sdd.size);
1527 + } else {
1528 + char buf[16];
1529 + zfs_nicenum(sdd.size, buf, sizeof (buf));
1530 + (void) fprintf(stderr, dgettext(TEXT_DOMAIN,
1531 + "total estimated size is %s\n"), buf);
1532 + }
1533 + }
1534 +
1535 + /* Ensure no snaps found is treated as an error. */
1536 + if (!sdd.seento) {
1537 + err = ENOENT;
1538 + goto err_out;
1566 1539 }
1540 +
1541 + /* Skip the second run if dryrun was requested. */
1542 + if (flags->dryrun)
1543 + goto err_out;
1544 +
1545 + if (sdd.snapholds != NULL) {
1546 + err = zfs_hold_nvl(zhp, sdd.cleanup_fd, sdd.snapholds);
1547 + if (err != 0)
1548 + goto stderr_out;
1549 +
1550 + fnvlist_free(sdd.snapholds);
1551 + sdd.snapholds = NULL;
1552 + }
1553 +
1554 + sdd.dryrun = B_FALSE;
1555 + sdd.verbose = B_FALSE;
1567 1556 }
1557 +
1568 1558 err = dump_filesystems(zhp, &sdd);
1569 1559 fsavl_destroy(fsavl);
1570 1560 nvlist_free(fss);
1571 1561
1572 - if (flags->dedup) {
1573 - (void) close(pipefd[0]);
1562 + /* Ensure no snaps found is treated as an error. */
1563 + if (err == 0 && !sdd.seento)
1564 + err = ENOENT;
1565 +
1566 + if (tid != 0) {
1567 + if (err != 0)
1568 + (void) pthread_cancel(tid);
1574 1569 (void) pthread_join(tid, NULL);
1570 + (void) close(pipefd[0]);
1575 1571 }
1576 1572
1577 1573 if (sdd.cleanup_fd != -1) {
1578 1574 VERIFY(0 == close(sdd.cleanup_fd));
1579 1575 sdd.cleanup_fd = -1;
1580 1576 }
1581 1577
1582 1578 if (!flags->dryrun && (flags->replicate || flags->doall ||
1583 1579 flags->props)) {
1584 1580 /*
1585 1581 * write final end record. NB: want to do this even if
1586 1582 * there was some error, because it might not be totally
1587 1583 * failed.
1588 1584 */
1589 1585 dmu_replay_record_t drr = { 0 };
1590 1586 drr.drr_type = DRR_END;
1591 1587 if (write(outfd, &drr, sizeof (drr)) == -1) {
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1592 1588 return (zfs_standard_error(zhp->zfs_hdl,
1593 1589 errno, errbuf));
1594 1590 }
1595 1591 }
1596 1592
1597 1593 return (err || sdd.err);
1598 1594
1599 1595 stderr_out:
1600 1596 err = zfs_standard_error(zhp->zfs_hdl, err, errbuf);
1601 1597 err_out:
1598 + fsavl_destroy(fsavl);
1599 + nvlist_free(fss);
1600 + fnvlist_free(sdd.snapholds);
1601 +
1602 1602 if (sdd.cleanup_fd != -1)
1603 1603 VERIFY(0 == close(sdd.cleanup_fd));
1604 - if (flags->dedup) {
1604 + if (tid != 0) {
1605 1605 (void) pthread_cancel(tid);
1606 1606 (void) pthread_join(tid, NULL);
1607 1607 (void) close(pipefd[0]);
1608 1608 }
1609 1609 return (err);
1610 1610 }
1611 1611
1612 1612 /*
1613 1613 * Routines specific to "zfs recv"
1614 1614 */
1615 1615
1616 1616 static int
1617 1617 recv_read(libzfs_handle_t *hdl, int fd, void *buf, int ilen,
1618 1618 boolean_t byteswap, zio_cksum_t *zc)
1619 1619 {
1620 1620 char *cp = buf;
1621 1621 int rv;
1622 1622 int len = ilen;
1623 1623
1624 1624 do {
1625 1625 rv = read(fd, cp, len);
1626 1626 cp += rv;
1627 1627 len -= rv;
1628 1628 } while (rv > 0);
1629 1629
1630 1630 if (rv < 0 || len != 0) {
1631 1631 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
1632 1632 "failed to read from stream"));
1633 1633 return (zfs_error(hdl, EZFS_BADSTREAM, dgettext(TEXT_DOMAIN,
1634 1634 "cannot receive")));
1635 1635 }
1636 1636
1637 1637 if (zc) {
1638 1638 if (byteswap)
1639 1639 fletcher_4_incremental_byteswap(buf, ilen, zc);
1640 1640 else
1641 1641 fletcher_4_incremental_native(buf, ilen, zc);
1642 1642 }
1643 1643 return (0);
1644 1644 }
1645 1645
1646 1646 static int
1647 1647 recv_read_nvlist(libzfs_handle_t *hdl, int fd, int len, nvlist_t **nvp,
1648 1648 boolean_t byteswap, zio_cksum_t *zc)
1649 1649 {
1650 1650 char *buf;
1651 1651 int err;
1652 1652
1653 1653 buf = zfs_alloc(hdl, len);
1654 1654 if (buf == NULL)
1655 1655 return (ENOMEM);
1656 1656
1657 1657 err = recv_read(hdl, fd, buf, len, byteswap, zc);
1658 1658 if (err != 0) {
1659 1659 free(buf);
1660 1660 return (err);
1661 1661 }
1662 1662
1663 1663 err = nvlist_unpack(buf, len, nvp, 0);
1664 1664 free(buf);
1665 1665 if (err != 0) {
1666 1666 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "invalid "
1667 1667 "stream (malformed nvlist)"));
1668 1668 return (EINVAL);
1669 1669 }
1670 1670 return (0);
1671 1671 }
1672 1672
1673 1673 static int
1674 1674 recv_rename(libzfs_handle_t *hdl, const char *name, const char *tryname,
1675 1675 int baselen, char *newname, recvflags_t *flags)
1676 1676 {
1677 1677 static int seq;
1678 1678 zfs_cmd_t zc = { 0 };
1679 1679 int err;
1680 1680 prop_changelist_t *clp;
1681 1681 zfs_handle_t *zhp;
1682 1682
1683 1683 zhp = zfs_open(hdl, name, ZFS_TYPE_DATASET);
1684 1684 if (zhp == NULL)
1685 1685 return (-1);
1686 1686 clp = changelist_gather(zhp, ZFS_PROP_NAME, 0,
1687 1687 flags->force ? MS_FORCE : 0);
1688 1688 zfs_close(zhp);
1689 1689 if (clp == NULL)
1690 1690 return (-1);
1691 1691 err = changelist_prefix(clp);
1692 1692 if (err)
1693 1693 return (err);
1694 1694
1695 1695 zc.zc_objset_type = DMU_OST_ZFS;
1696 1696 (void) strlcpy(zc.zc_name, name, sizeof (zc.zc_name));
1697 1697
1698 1698 if (tryname) {
1699 1699 (void) strcpy(newname, tryname);
1700 1700
1701 1701 (void) strlcpy(zc.zc_value, tryname, sizeof (zc.zc_value));
1702 1702
1703 1703 if (flags->verbose) {
1704 1704 (void) printf("attempting rename %s to %s\n",
1705 1705 zc.zc_name, zc.zc_value);
1706 1706 }
1707 1707 err = ioctl(hdl->libzfs_fd, ZFS_IOC_RENAME, &zc);
1708 1708 if (err == 0)
1709 1709 changelist_rename(clp, name, tryname);
1710 1710 } else {
1711 1711 err = ENOENT;
1712 1712 }
1713 1713
1714 1714 if (err != 0 && strncmp(name + baselen, "recv-", 5) != 0) {
1715 1715 seq++;
1716 1716
1717 1717 (void) snprintf(newname, ZFS_MAXNAMELEN, "%.*srecv-%u-%u",
1718 1718 baselen, name, getpid(), seq);
1719 1719 (void) strlcpy(zc.zc_value, newname, sizeof (zc.zc_value));
1720 1720
1721 1721 if (flags->verbose) {
1722 1722 (void) printf("failed - trying rename %s to %s\n",
1723 1723 zc.zc_name, zc.zc_value);
1724 1724 }
1725 1725 err = ioctl(hdl->libzfs_fd, ZFS_IOC_RENAME, &zc);
1726 1726 if (err == 0)
1727 1727 changelist_rename(clp, name, newname);
1728 1728 if (err && flags->verbose) {
1729 1729 (void) printf("failed (%u) - "
1730 1730 "will try again on next pass\n", errno);
1731 1731 }
1732 1732 err = EAGAIN;
1733 1733 } else if (flags->verbose) {
1734 1734 if (err == 0)
1735 1735 (void) printf("success\n");
1736 1736 else
1737 1737 (void) printf("failed (%u)\n", errno);
1738 1738 }
1739 1739
1740 1740 (void) changelist_postfix(clp);
1741 1741 changelist_free(clp);
1742 1742
1743 1743 return (err);
1744 1744 }
1745 1745
1746 1746 static int
1747 1747 recv_destroy(libzfs_handle_t *hdl, const char *name, int baselen,
1748 1748 char *newname, recvflags_t *flags)
1749 1749 {
1750 1750 zfs_cmd_t zc = { 0 };
1751 1751 int err = 0;
1752 1752 prop_changelist_t *clp;
1753 1753 zfs_handle_t *zhp;
1754 1754 boolean_t defer = B_FALSE;
1755 1755 int spa_version;
1756 1756
1757 1757 zhp = zfs_open(hdl, name, ZFS_TYPE_DATASET);
1758 1758 if (zhp == NULL)
1759 1759 return (-1);
1760 1760 clp = changelist_gather(zhp, ZFS_PROP_NAME, 0,
1761 1761 flags->force ? MS_FORCE : 0);
1762 1762 if (zfs_get_type(zhp) == ZFS_TYPE_SNAPSHOT &&
1763 1763 zfs_spa_version(zhp, &spa_version) == 0 &&
1764 1764 spa_version >= SPA_VERSION_USERREFS)
1765 1765 defer = B_TRUE;
1766 1766 zfs_close(zhp);
1767 1767 if (clp == NULL)
1768 1768 return (-1);
1769 1769 err = changelist_prefix(clp);
1770 1770 if (err)
1771 1771 return (err);
1772 1772
1773 1773 zc.zc_objset_type = DMU_OST_ZFS;
1774 1774 zc.zc_defer_destroy = defer;
1775 1775 (void) strlcpy(zc.zc_name, name, sizeof (zc.zc_name));
1776 1776
1777 1777 if (flags->verbose)
1778 1778 (void) printf("attempting destroy %s\n", zc.zc_name);
1779 1779 err = ioctl(hdl->libzfs_fd, ZFS_IOC_DESTROY, &zc);
1780 1780 if (err == 0) {
1781 1781 if (flags->verbose)
1782 1782 (void) printf("success\n");
1783 1783 changelist_remove(clp, zc.zc_name);
1784 1784 }
1785 1785
1786 1786 (void) changelist_postfix(clp);
1787 1787 changelist_free(clp);
1788 1788
1789 1789 /*
1790 1790 * Deferred destroy might destroy the snapshot or only mark it to be
1791 1791 * destroyed later, and it returns success in either case.
1792 1792 */
1793 1793 if (err != 0 || (defer && zfs_dataset_exists(hdl, name,
1794 1794 ZFS_TYPE_SNAPSHOT))) {
1795 1795 err = recv_rename(hdl, name, NULL, baselen, newname, flags);
1796 1796 }
1797 1797
1798 1798 return (err);
1799 1799 }
1800 1800
1801 1801 typedef struct guid_to_name_data {
1802 1802 uint64_t guid;
1803 1803 char *name;
1804 1804 char *skip;
1805 1805 } guid_to_name_data_t;
1806 1806
1807 1807 static int
1808 1808 guid_to_name_cb(zfs_handle_t *zhp, void *arg)
1809 1809 {
1810 1810 guid_to_name_data_t *gtnd = arg;
1811 1811 int err;
1812 1812
1813 1813 if (gtnd->skip != NULL &&
1814 1814 strcmp(zhp->zfs_name, gtnd->skip) == 0) {
1815 1815 return (0);
1816 1816 }
1817 1817
1818 1818 if (zhp->zfs_dmustats.dds_guid == gtnd->guid) {
1819 1819 (void) strcpy(gtnd->name, zhp->zfs_name);
1820 1820 zfs_close(zhp);
1821 1821 return (EEXIST);
1822 1822 }
1823 1823
1824 1824 err = zfs_iter_children(zhp, guid_to_name_cb, gtnd);
1825 1825 zfs_close(zhp);
1826 1826 return (err);
1827 1827 }
1828 1828
1829 1829 /*
1830 1830 * Attempt to find the local dataset associated with this guid. In the case of
1831 1831 * multiple matches, we attempt to find the "best" match by searching
1832 1832 * progressively larger portions of the hierarchy. This allows one to send a
1833 1833 * tree of datasets individually and guarantee that we will find the source
1834 1834 * guid within that hierarchy, even if there are multiple matches elsewhere.
1835 1835 */
1836 1836 static int
1837 1837 guid_to_name(libzfs_handle_t *hdl, const char *parent, uint64_t guid,
1838 1838 char *name)
1839 1839 {
1840 1840 /* exhaustive search all local snapshots */
1841 1841 char pname[ZFS_MAXNAMELEN];
1842 1842 guid_to_name_data_t gtnd;
1843 1843 int err = 0;
1844 1844 zfs_handle_t *zhp;
1845 1845 char *cp;
1846 1846
1847 1847 gtnd.guid = guid;
1848 1848 gtnd.name = name;
1849 1849 gtnd.skip = NULL;
1850 1850
1851 1851 (void) strlcpy(pname, parent, sizeof (pname));
1852 1852
1853 1853 /*
1854 1854 * Search progressively larger portions of the hierarchy. This will
1855 1855 * select the "most local" version of the origin snapshot in the case
1856 1856 * that there are multiple matching snapshots in the system.
1857 1857 */
1858 1858 while ((cp = strrchr(pname, '/')) != NULL) {
1859 1859
1860 1860 /* Chop off the last component and open the parent */
1861 1861 *cp = '\0';
1862 1862 zhp = make_dataset_handle(hdl, pname);
1863 1863
1864 1864 if (zhp == NULL)
1865 1865 continue;
1866 1866
1867 1867 err = zfs_iter_children(zhp, guid_to_name_cb, >nd);
1868 1868 zfs_close(zhp);
1869 1869 if (err == EEXIST)
1870 1870 return (0);
1871 1871
1872 1872 /*
1873 1873 * Remember the dataset that we already searched, so we
1874 1874 * skip it next time through.
1875 1875 */
1876 1876 gtnd.skip = pname;
1877 1877 }
1878 1878
1879 1879 return (ENOENT);
1880 1880 }
1881 1881
1882 1882 /*
1883 1883 * Return +1 if guid1 is before guid2, 0 if they are the same, and -1 if
1884 1884 * guid1 is after guid2.
1885 1885 */
1886 1886 static int
1887 1887 created_before(libzfs_handle_t *hdl, avl_tree_t *avl,
1888 1888 uint64_t guid1, uint64_t guid2)
1889 1889 {
1890 1890 nvlist_t *nvfs;
1891 1891 char *fsname, *snapname;
1892 1892 char buf[ZFS_MAXNAMELEN];
1893 1893 int rv;
1894 1894 zfs_handle_t *guid1hdl, *guid2hdl;
1895 1895 uint64_t create1, create2;
1896 1896
1897 1897 if (guid2 == 0)
1898 1898 return (0);
1899 1899 if (guid1 == 0)
1900 1900 return (1);
1901 1901
1902 1902 nvfs = fsavl_find(avl, guid1, &snapname);
1903 1903 VERIFY(0 == nvlist_lookup_string(nvfs, "name", &fsname));
1904 1904 (void) snprintf(buf, sizeof (buf), "%s@%s", fsname, snapname);
1905 1905 guid1hdl = zfs_open(hdl, buf, ZFS_TYPE_SNAPSHOT);
1906 1906 if (guid1hdl == NULL)
1907 1907 return (-1);
1908 1908
1909 1909 nvfs = fsavl_find(avl, guid2, &snapname);
1910 1910 VERIFY(0 == nvlist_lookup_string(nvfs, "name", &fsname));
1911 1911 (void) snprintf(buf, sizeof (buf), "%s@%s", fsname, snapname);
1912 1912 guid2hdl = zfs_open(hdl, buf, ZFS_TYPE_SNAPSHOT);
1913 1913 if (guid2hdl == NULL) {
1914 1914 zfs_close(guid1hdl);
1915 1915 return (-1);
1916 1916 }
1917 1917
1918 1918 create1 = zfs_prop_get_int(guid1hdl, ZFS_PROP_CREATETXG);
1919 1919 create2 = zfs_prop_get_int(guid2hdl, ZFS_PROP_CREATETXG);
1920 1920
1921 1921 if (create1 < create2)
1922 1922 rv = -1;
1923 1923 else if (create1 > create2)
1924 1924 rv = +1;
1925 1925 else
1926 1926 rv = 0;
1927 1927
1928 1928 zfs_close(guid1hdl);
1929 1929 zfs_close(guid2hdl);
1930 1930
1931 1931 return (rv);
1932 1932 }
1933 1933
1934 1934 static int
1935 1935 recv_incremental_replication(libzfs_handle_t *hdl, const char *tofs,
1936 1936 recvflags_t *flags, nvlist_t *stream_nv, avl_tree_t *stream_avl,
1937 1937 nvlist_t *renamed)
1938 1938 {
1939 1939 nvlist_t *local_nv;
1940 1940 avl_tree_t *local_avl;
1941 1941 nvpair_t *fselem, *nextfselem;
1942 1942 char *fromsnap;
1943 1943 char newname[ZFS_MAXNAMELEN];
1944 1944 int error;
1945 1945 boolean_t needagain, progress, recursive;
1946 1946 char *s1, *s2;
1947 1947
1948 1948 VERIFY(0 == nvlist_lookup_string(stream_nv, "fromsnap", &fromsnap));
1949 1949
1950 1950 recursive = (nvlist_lookup_boolean(stream_nv, "not_recursive") ==
1951 1951 ENOENT);
1952 1952
1953 1953 if (flags->dryrun)
1954 1954 return (0);
1955 1955
1956 1956 again:
1957 1957 needagain = progress = B_FALSE;
1958 1958
1959 1959 if ((error = gather_nvlist(hdl, tofs, fromsnap, NULL,
1960 1960 recursive, &local_nv, &local_avl)) != 0)
1961 1961 return (error);
1962 1962
1963 1963 /*
1964 1964 * Process deletes and renames
1965 1965 */
1966 1966 for (fselem = nvlist_next_nvpair(local_nv, NULL);
1967 1967 fselem; fselem = nextfselem) {
1968 1968 nvlist_t *nvfs, *snaps;
1969 1969 nvlist_t *stream_nvfs = NULL;
1970 1970 nvpair_t *snapelem, *nextsnapelem;
1971 1971 uint64_t fromguid = 0;
1972 1972 uint64_t originguid = 0;
1973 1973 uint64_t stream_originguid = 0;
1974 1974 uint64_t parent_fromsnap_guid, stream_parent_fromsnap_guid;
1975 1975 char *fsname, *stream_fsname;
1976 1976
1977 1977 nextfselem = nvlist_next_nvpair(local_nv, fselem);
1978 1978
1979 1979 VERIFY(0 == nvpair_value_nvlist(fselem, &nvfs));
1980 1980 VERIFY(0 == nvlist_lookup_nvlist(nvfs, "snaps", &snaps));
1981 1981 VERIFY(0 == nvlist_lookup_string(nvfs, "name", &fsname));
1982 1982 VERIFY(0 == nvlist_lookup_uint64(nvfs, "parentfromsnap",
1983 1983 &parent_fromsnap_guid));
1984 1984 (void) nvlist_lookup_uint64(nvfs, "origin", &originguid);
1985 1985
1986 1986 /*
1987 1987 * First find the stream's fs, so we can check for
1988 1988 * a different origin (due to "zfs promote")
1989 1989 */
1990 1990 for (snapelem = nvlist_next_nvpair(snaps, NULL);
1991 1991 snapelem; snapelem = nvlist_next_nvpair(snaps, snapelem)) {
1992 1992 uint64_t thisguid;
1993 1993
1994 1994 VERIFY(0 == nvpair_value_uint64(snapelem, &thisguid));
1995 1995 stream_nvfs = fsavl_find(stream_avl, thisguid, NULL);
1996 1996
1997 1997 if (stream_nvfs != NULL)
1998 1998 break;
1999 1999 }
2000 2000
2001 2001 /* check for promote */
2002 2002 (void) nvlist_lookup_uint64(stream_nvfs, "origin",
2003 2003 &stream_originguid);
2004 2004 if (stream_nvfs && originguid != stream_originguid) {
2005 2005 switch (created_before(hdl, local_avl,
2006 2006 stream_originguid, originguid)) {
2007 2007 case 1: {
2008 2008 /* promote it! */
2009 2009 zfs_cmd_t zc = { 0 };
2010 2010 nvlist_t *origin_nvfs;
2011 2011 char *origin_fsname;
2012 2012
2013 2013 if (flags->verbose)
2014 2014 (void) printf("promoting %s\n", fsname);
2015 2015
2016 2016 origin_nvfs = fsavl_find(local_avl, originguid,
2017 2017 NULL);
2018 2018 VERIFY(0 == nvlist_lookup_string(origin_nvfs,
2019 2019 "name", &origin_fsname));
2020 2020 (void) strlcpy(zc.zc_value, origin_fsname,
2021 2021 sizeof (zc.zc_value));
2022 2022 (void) strlcpy(zc.zc_name, fsname,
2023 2023 sizeof (zc.zc_name));
2024 2024 error = zfs_ioctl(hdl, ZFS_IOC_PROMOTE, &zc);
2025 2025 if (error == 0)
2026 2026 progress = B_TRUE;
2027 2027 break;
2028 2028 }
2029 2029 default:
2030 2030 break;
2031 2031 case -1:
2032 2032 fsavl_destroy(local_avl);
2033 2033 nvlist_free(local_nv);
2034 2034 return (-1);
2035 2035 }
2036 2036 /*
2037 2037 * We had/have the wrong origin, therefore our
2038 2038 * list of snapshots is wrong. Need to handle
2039 2039 * them on the next pass.
2040 2040 */
2041 2041 needagain = B_TRUE;
2042 2042 continue;
2043 2043 }
2044 2044
2045 2045 for (snapelem = nvlist_next_nvpair(snaps, NULL);
2046 2046 snapelem; snapelem = nextsnapelem) {
2047 2047 uint64_t thisguid;
2048 2048 char *stream_snapname;
2049 2049 nvlist_t *found, *props;
2050 2050
2051 2051 nextsnapelem = nvlist_next_nvpair(snaps, snapelem);
2052 2052
2053 2053 VERIFY(0 == nvpair_value_uint64(snapelem, &thisguid));
2054 2054 found = fsavl_find(stream_avl, thisguid,
2055 2055 &stream_snapname);
2056 2056
2057 2057 /* check for delete */
2058 2058 if (found == NULL) {
2059 2059 char name[ZFS_MAXNAMELEN];
2060 2060
2061 2061 if (!flags->force)
2062 2062 continue;
2063 2063
2064 2064 (void) snprintf(name, sizeof (name), "%s@%s",
2065 2065 fsname, nvpair_name(snapelem));
2066 2066
2067 2067 error = recv_destroy(hdl, name,
2068 2068 strlen(fsname)+1, newname, flags);
2069 2069 if (error)
2070 2070 needagain = B_TRUE;
2071 2071 else
2072 2072 progress = B_TRUE;
2073 2073 continue;
2074 2074 }
2075 2075
2076 2076 stream_nvfs = found;
2077 2077
2078 2078 if (0 == nvlist_lookup_nvlist(stream_nvfs, "snapprops",
2079 2079 &props) && 0 == nvlist_lookup_nvlist(props,
2080 2080 stream_snapname, &props)) {
2081 2081 zfs_cmd_t zc = { 0 };
2082 2082
2083 2083 zc.zc_cookie = B_TRUE; /* received */
2084 2084 (void) snprintf(zc.zc_name, sizeof (zc.zc_name),
2085 2085 "%s@%s", fsname, nvpair_name(snapelem));
2086 2086 if (zcmd_write_src_nvlist(hdl, &zc,
2087 2087 props) == 0) {
2088 2088 (void) zfs_ioctl(hdl,
2089 2089 ZFS_IOC_SET_PROP, &zc);
2090 2090 zcmd_free_nvlists(&zc);
2091 2091 }
2092 2092 }
2093 2093
2094 2094 /* check for different snapname */
2095 2095 if (strcmp(nvpair_name(snapelem),
2096 2096 stream_snapname) != 0) {
2097 2097 char name[ZFS_MAXNAMELEN];
2098 2098 char tryname[ZFS_MAXNAMELEN];
2099 2099
2100 2100 (void) snprintf(name, sizeof (name), "%s@%s",
2101 2101 fsname, nvpair_name(snapelem));
2102 2102 (void) snprintf(tryname, sizeof (name), "%s@%s",
2103 2103 fsname, stream_snapname);
2104 2104
2105 2105 error = recv_rename(hdl, name, tryname,
2106 2106 strlen(fsname)+1, newname, flags);
2107 2107 if (error)
2108 2108 needagain = B_TRUE;
2109 2109 else
2110 2110 progress = B_TRUE;
2111 2111 }
2112 2112
2113 2113 if (strcmp(stream_snapname, fromsnap) == 0)
2114 2114 fromguid = thisguid;
2115 2115 }
2116 2116
2117 2117 /* check for delete */
2118 2118 if (stream_nvfs == NULL) {
2119 2119 if (!flags->force)
2120 2120 continue;
2121 2121
2122 2122 error = recv_destroy(hdl, fsname, strlen(tofs)+1,
2123 2123 newname, flags);
2124 2124 if (error)
2125 2125 needagain = B_TRUE;
2126 2126 else
2127 2127 progress = B_TRUE;
2128 2128 continue;
2129 2129 }
2130 2130
2131 2131 if (fromguid == 0) {
2132 2132 if (flags->verbose) {
2133 2133 (void) printf("local fs %s does not have "
2134 2134 "fromsnap (%s in stream); must have "
2135 2135 "been deleted locally; ignoring\n",
2136 2136 fsname, fromsnap);
2137 2137 }
2138 2138 continue;
2139 2139 }
2140 2140
2141 2141 VERIFY(0 == nvlist_lookup_string(stream_nvfs,
2142 2142 "name", &stream_fsname));
2143 2143 VERIFY(0 == nvlist_lookup_uint64(stream_nvfs,
2144 2144 "parentfromsnap", &stream_parent_fromsnap_guid));
2145 2145
2146 2146 s1 = strrchr(fsname, '/');
2147 2147 s2 = strrchr(stream_fsname, '/');
2148 2148
2149 2149 /*
2150 2150 * Check for rename. If the exact receive path is specified, it
2151 2151 * does not count as a rename, but we still need to check the
2152 2152 * datasets beneath it.
2153 2153 */
2154 2154 if ((stream_parent_fromsnap_guid != 0 &&
2155 2155 parent_fromsnap_guid != 0 &&
2156 2156 stream_parent_fromsnap_guid != parent_fromsnap_guid) ||
2157 2157 ((flags->isprefix || strcmp(tofs, fsname) != 0) &&
2158 2158 (s1 != NULL) && (s2 != NULL) && strcmp(s1, s2) != 0)) {
2159 2159 nvlist_t *parent;
2160 2160 char tryname[ZFS_MAXNAMELEN];
2161 2161
2162 2162 parent = fsavl_find(local_avl,
2163 2163 stream_parent_fromsnap_guid, NULL);
2164 2164 /*
2165 2165 * NB: parent might not be found if we used the
2166 2166 * tosnap for stream_parent_fromsnap_guid,
2167 2167 * because the parent is a newly-created fs;
2168 2168 * we'll be able to rename it after we recv the
2169 2169 * new fs.
2170 2170 */
2171 2171 if (parent != NULL) {
2172 2172 char *pname;
2173 2173
2174 2174 VERIFY(0 == nvlist_lookup_string(parent, "name",
2175 2175 &pname));
2176 2176 (void) snprintf(tryname, sizeof (tryname),
2177 2177 "%s%s", pname, strrchr(stream_fsname, '/'));
2178 2178 } else {
2179 2179 tryname[0] = '\0';
2180 2180 if (flags->verbose) {
2181 2181 (void) printf("local fs %s new parent "
2182 2182 "not found\n", fsname);
2183 2183 }
2184 2184 }
2185 2185
2186 2186 newname[0] = '\0';
2187 2187
2188 2188 error = recv_rename(hdl, fsname, tryname,
2189 2189 strlen(tofs)+1, newname, flags);
2190 2190
2191 2191 if (renamed != NULL && newname[0] != '\0') {
2192 2192 VERIFY(0 == nvlist_add_boolean(renamed,
2193 2193 newname));
2194 2194 }
2195 2195
2196 2196 if (error)
2197 2197 needagain = B_TRUE;
2198 2198 else
2199 2199 progress = B_TRUE;
2200 2200 }
2201 2201 }
2202 2202
2203 2203 fsavl_destroy(local_avl);
2204 2204 nvlist_free(local_nv);
2205 2205
2206 2206 if (needagain && progress) {
2207 2207 /* do another pass to fix up temporary names */
2208 2208 if (flags->verbose)
2209 2209 (void) printf("another pass:\n");
2210 2210 goto again;
2211 2211 }
2212 2212
2213 2213 return (needagain);
2214 2214 }
2215 2215
2216 2216 static int
2217 2217 zfs_receive_package(libzfs_handle_t *hdl, int fd, const char *destname,
2218 2218 recvflags_t *flags, dmu_replay_record_t *drr, zio_cksum_t *zc,
2219 2219 char **top_zfs, int cleanup_fd, uint64_t *action_handlep)
2220 2220 {
2221 2221 nvlist_t *stream_nv = NULL;
2222 2222 avl_tree_t *stream_avl = NULL;
2223 2223 char *fromsnap = NULL;
2224 2224 char *cp;
2225 2225 char tofs[ZFS_MAXNAMELEN];
2226 2226 char sendfs[ZFS_MAXNAMELEN];
2227 2227 char errbuf[1024];
2228 2228 dmu_replay_record_t drre;
2229 2229 int error;
2230 2230 boolean_t anyerr = B_FALSE;
2231 2231 boolean_t softerr = B_FALSE;
2232 2232 boolean_t recursive;
2233 2233
2234 2234 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
2235 2235 "cannot receive"));
2236 2236
2237 2237 assert(drr->drr_type == DRR_BEGIN);
2238 2238 assert(drr->drr_u.drr_begin.drr_magic == DMU_BACKUP_MAGIC);
2239 2239 assert(DMU_GET_STREAM_HDRTYPE(drr->drr_u.drr_begin.drr_versioninfo) ==
2240 2240 DMU_COMPOUNDSTREAM);
2241 2241
2242 2242 /*
2243 2243 * Read in the nvlist from the stream.
2244 2244 */
2245 2245 if (drr->drr_payloadlen != 0) {
2246 2246 error = recv_read_nvlist(hdl, fd, drr->drr_payloadlen,
2247 2247 &stream_nv, flags->byteswap, zc);
2248 2248 if (error) {
2249 2249 error = zfs_error(hdl, EZFS_BADSTREAM, errbuf);
2250 2250 goto out;
2251 2251 }
2252 2252 }
2253 2253
2254 2254 recursive = (nvlist_lookup_boolean(stream_nv, "not_recursive") ==
2255 2255 ENOENT);
2256 2256
2257 2257 if (recursive && strchr(destname, '@')) {
2258 2258 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
2259 2259 "cannot specify snapshot name for multi-snapshot stream"));
2260 2260 error = zfs_error(hdl, EZFS_BADSTREAM, errbuf);
2261 2261 goto out;
2262 2262 }
2263 2263
2264 2264 /*
2265 2265 * Read in the end record and verify checksum.
2266 2266 */
2267 2267 if (0 != (error = recv_read(hdl, fd, &drre, sizeof (drre),
2268 2268 flags->byteswap, NULL)))
2269 2269 goto out;
2270 2270 if (flags->byteswap) {
2271 2271 drre.drr_type = BSWAP_32(drre.drr_type);
2272 2272 drre.drr_u.drr_end.drr_checksum.zc_word[0] =
2273 2273 BSWAP_64(drre.drr_u.drr_end.drr_checksum.zc_word[0]);
2274 2274 drre.drr_u.drr_end.drr_checksum.zc_word[1] =
2275 2275 BSWAP_64(drre.drr_u.drr_end.drr_checksum.zc_word[1]);
2276 2276 drre.drr_u.drr_end.drr_checksum.zc_word[2] =
2277 2277 BSWAP_64(drre.drr_u.drr_end.drr_checksum.zc_word[2]);
2278 2278 drre.drr_u.drr_end.drr_checksum.zc_word[3] =
2279 2279 BSWAP_64(drre.drr_u.drr_end.drr_checksum.zc_word[3]);
2280 2280 }
2281 2281 if (drre.drr_type != DRR_END) {
2282 2282 error = zfs_error(hdl, EZFS_BADSTREAM, errbuf);
2283 2283 goto out;
2284 2284 }
2285 2285 if (!ZIO_CHECKSUM_EQUAL(drre.drr_u.drr_end.drr_checksum, *zc)) {
2286 2286 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
2287 2287 "incorrect header checksum"));
2288 2288 error = zfs_error(hdl, EZFS_BADSTREAM, errbuf);
2289 2289 goto out;
2290 2290 }
2291 2291
2292 2292 (void) nvlist_lookup_string(stream_nv, "fromsnap", &fromsnap);
2293 2293
2294 2294 if (drr->drr_payloadlen != 0) {
2295 2295 nvlist_t *stream_fss;
2296 2296
2297 2297 VERIFY(0 == nvlist_lookup_nvlist(stream_nv, "fss",
2298 2298 &stream_fss));
2299 2299 if ((stream_avl = fsavl_create(stream_fss)) == NULL) {
2300 2300 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
2301 2301 "couldn't allocate avl tree"));
2302 2302 error = zfs_error(hdl, EZFS_NOMEM, errbuf);
2303 2303 goto out;
2304 2304 }
2305 2305
2306 2306 if (fromsnap != NULL) {
2307 2307 nvlist_t *renamed = NULL;
2308 2308 nvpair_t *pair = NULL;
2309 2309
2310 2310 (void) strlcpy(tofs, destname, ZFS_MAXNAMELEN);
2311 2311 if (flags->isprefix) {
2312 2312 struct drr_begin *drrb = &drr->drr_u.drr_begin;
2313 2313 int i;
2314 2314
2315 2315 if (flags->istail) {
2316 2316 cp = strrchr(drrb->drr_toname, '/');
2317 2317 if (cp == NULL) {
2318 2318 (void) strlcat(tofs, "/",
2319 2319 ZFS_MAXNAMELEN);
2320 2320 i = 0;
2321 2321 } else {
2322 2322 i = (cp - drrb->drr_toname);
2323 2323 }
2324 2324 } else {
2325 2325 i = strcspn(drrb->drr_toname, "/@");
2326 2326 }
2327 2327 /* zfs_receive_one() will create_parents() */
2328 2328 (void) strlcat(tofs, &drrb->drr_toname[i],
2329 2329 ZFS_MAXNAMELEN);
2330 2330 *strchr(tofs, '@') = '\0';
2331 2331 }
2332 2332
2333 2333 if (recursive && !flags->dryrun && !flags->nomount) {
2334 2334 VERIFY(0 == nvlist_alloc(&renamed,
2335 2335 NV_UNIQUE_NAME, 0));
2336 2336 }
2337 2337
2338 2338 softerr = recv_incremental_replication(hdl, tofs, flags,
2339 2339 stream_nv, stream_avl, renamed);
2340 2340
2341 2341 /* Unmount renamed filesystems before receiving. */
2342 2342 while ((pair = nvlist_next_nvpair(renamed,
2343 2343 pair)) != NULL) {
2344 2344 zfs_handle_t *zhp;
2345 2345 prop_changelist_t *clp = NULL;
2346 2346
2347 2347 zhp = zfs_open(hdl, nvpair_name(pair),
2348 2348 ZFS_TYPE_FILESYSTEM);
2349 2349 if (zhp != NULL) {
2350 2350 clp = changelist_gather(zhp,
2351 2351 ZFS_PROP_MOUNTPOINT, 0, 0);
2352 2352 zfs_close(zhp);
2353 2353 if (clp != NULL) {
2354 2354 softerr |=
2355 2355 changelist_prefix(clp);
2356 2356 changelist_free(clp);
2357 2357 }
2358 2358 }
2359 2359 }
2360 2360
2361 2361 nvlist_free(renamed);
2362 2362 }
2363 2363 }
2364 2364
2365 2365 /*
2366 2366 * Get the fs specified by the first path in the stream (the top level
2367 2367 * specified by 'zfs send') and pass it to each invocation of
2368 2368 * zfs_receive_one().
2369 2369 */
2370 2370 (void) strlcpy(sendfs, drr->drr_u.drr_begin.drr_toname,
2371 2371 ZFS_MAXNAMELEN);
2372 2372 if ((cp = strchr(sendfs, '@')) != NULL)
2373 2373 *cp = '\0';
2374 2374
2375 2375 /* Finally, receive each contained stream */
2376 2376 do {
2377 2377 /*
2378 2378 * we should figure out if it has a recoverable
2379 2379 * error, in which case do a recv_skip() and drive on.
2380 2380 * Note, if we fail due to already having this guid,
2381 2381 * zfs_receive_one() will take care of it (ie,
2382 2382 * recv_skip() and return 0).
2383 2383 */
2384 2384 error = zfs_receive_impl(hdl, destname, flags, fd,
2385 2385 sendfs, stream_nv, stream_avl, top_zfs, cleanup_fd,
2386 2386 action_handlep);
2387 2387 if (error == ENODATA) {
2388 2388 error = 0;
2389 2389 break;
2390 2390 }
2391 2391 anyerr |= error;
2392 2392 } while (error == 0);
2393 2393
2394 2394 if (drr->drr_payloadlen != 0 && fromsnap != NULL) {
2395 2395 /*
2396 2396 * Now that we have the fs's they sent us, try the
2397 2397 * renames again.
2398 2398 */
2399 2399 softerr = recv_incremental_replication(hdl, tofs, flags,
2400 2400 stream_nv, stream_avl, NULL);
2401 2401 }
2402 2402
2403 2403 out:
2404 2404 fsavl_destroy(stream_avl);
2405 2405 if (stream_nv)
2406 2406 nvlist_free(stream_nv);
2407 2407 if (softerr)
2408 2408 error = -2;
2409 2409 if (anyerr)
2410 2410 error = -1;
2411 2411 return (error);
2412 2412 }
2413 2413
2414 2414 static void
2415 2415 trunc_prop_errs(int truncated)
2416 2416 {
2417 2417 ASSERT(truncated != 0);
2418 2418
2419 2419 if (truncated == 1)
2420 2420 (void) fprintf(stderr, dgettext(TEXT_DOMAIN,
2421 2421 "1 more property could not be set\n"));
2422 2422 else
2423 2423 (void) fprintf(stderr, dgettext(TEXT_DOMAIN,
2424 2424 "%d more properties could not be set\n"), truncated);
2425 2425 }
2426 2426
2427 2427 static int
2428 2428 recv_skip(libzfs_handle_t *hdl, int fd, boolean_t byteswap)
2429 2429 {
2430 2430 dmu_replay_record_t *drr;
2431 2431 void *buf = malloc(1<<20);
2432 2432 char errbuf[1024];
2433 2433
2434 2434 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
2435 2435 "cannot receive:"));
2436 2436
2437 2437 /* XXX would be great to use lseek if possible... */
2438 2438 drr = buf;
2439 2439
2440 2440 while (recv_read(hdl, fd, drr, sizeof (dmu_replay_record_t),
2441 2441 byteswap, NULL) == 0) {
2442 2442 if (byteswap)
2443 2443 drr->drr_type = BSWAP_32(drr->drr_type);
2444 2444
2445 2445 switch (drr->drr_type) {
2446 2446 case DRR_BEGIN:
2447 2447 /* NB: not to be used on v2 stream packages */
2448 2448 if (drr->drr_payloadlen != 0) {
2449 2449 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
2450 2450 "invalid substream header"));
2451 2451 return (zfs_error(hdl, EZFS_BADSTREAM, errbuf));
2452 2452 }
2453 2453 break;
2454 2454
2455 2455 case DRR_END:
2456 2456 free(buf);
2457 2457 return (0);
2458 2458
2459 2459 case DRR_OBJECT:
2460 2460 if (byteswap) {
2461 2461 drr->drr_u.drr_object.drr_bonuslen =
2462 2462 BSWAP_32(drr->drr_u.drr_object.
2463 2463 drr_bonuslen);
2464 2464 }
2465 2465 (void) recv_read(hdl, fd, buf,
2466 2466 P2ROUNDUP(drr->drr_u.drr_object.drr_bonuslen, 8),
2467 2467 B_FALSE, NULL);
2468 2468 break;
2469 2469
2470 2470 case DRR_WRITE:
2471 2471 if (byteswap) {
2472 2472 drr->drr_u.drr_write.drr_length =
2473 2473 BSWAP_64(drr->drr_u.drr_write.drr_length);
2474 2474 }
2475 2475 (void) recv_read(hdl, fd, buf,
2476 2476 drr->drr_u.drr_write.drr_length, B_FALSE, NULL);
2477 2477 break;
2478 2478 case DRR_SPILL:
2479 2479 if (byteswap) {
2480 2480 drr->drr_u.drr_write.drr_length =
2481 2481 BSWAP_64(drr->drr_u.drr_spill.drr_length);
2482 2482 }
2483 2483 (void) recv_read(hdl, fd, buf,
2484 2484 drr->drr_u.drr_spill.drr_length, B_FALSE, NULL);
2485 2485 break;
2486 2486 case DRR_WRITE_BYREF:
2487 2487 case DRR_FREEOBJECTS:
2488 2488 case DRR_FREE:
2489 2489 break;
2490 2490
2491 2491 default:
2492 2492 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
2493 2493 "invalid record type"));
2494 2494 return (zfs_error(hdl, EZFS_BADSTREAM, errbuf));
2495 2495 }
2496 2496 }
2497 2497
2498 2498 free(buf);
2499 2499 return (-1);
2500 2500 }
2501 2501
2502 2502 /*
2503 2503 * Restores a backup of tosnap from the file descriptor specified by infd.
2504 2504 */
2505 2505 static int
2506 2506 zfs_receive_one(libzfs_handle_t *hdl, int infd, const char *tosnap,
2507 2507 recvflags_t *flags, dmu_replay_record_t *drr,
2508 2508 dmu_replay_record_t *drr_noswap, const char *sendfs,
2509 2509 nvlist_t *stream_nv, avl_tree_t *stream_avl, char **top_zfs, int cleanup_fd,
2510 2510 uint64_t *action_handlep)
2511 2511 {
2512 2512 zfs_cmd_t zc = { 0 };
2513 2513 time_t begin_time;
2514 2514 int ioctl_err, ioctl_errno, err;
2515 2515 char *cp;
2516 2516 struct drr_begin *drrb = &drr->drr_u.drr_begin;
2517 2517 char errbuf[1024];
2518 2518 char prop_errbuf[1024];
2519 2519 const char *chopprefix;
2520 2520 boolean_t newfs = B_FALSE;
2521 2521 boolean_t stream_wantsnewfs;
2522 2522 uint64_t parent_snapguid = 0;
2523 2523 prop_changelist_t *clp = NULL;
2524 2524 nvlist_t *snapprops_nvlist = NULL;
2525 2525 zprop_errflags_t prop_errflags;
2526 2526 boolean_t recursive;
2527 2527
2528 2528 begin_time = time(NULL);
2529 2529
2530 2530 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
2531 2531 "cannot receive"));
2532 2532
2533 2533 recursive = (nvlist_lookup_boolean(stream_nv, "not_recursive") ==
2534 2534 ENOENT);
2535 2535
2536 2536 if (stream_avl != NULL) {
2537 2537 char *snapname;
2538 2538 nvlist_t *fs = fsavl_find(stream_avl, drrb->drr_toguid,
2539 2539 &snapname);
2540 2540 nvlist_t *props;
2541 2541 int ret;
2542 2542
2543 2543 (void) nvlist_lookup_uint64(fs, "parentfromsnap",
2544 2544 &parent_snapguid);
2545 2545 err = nvlist_lookup_nvlist(fs, "props", &props);
2546 2546 if (err)
2547 2547 VERIFY(0 == nvlist_alloc(&props, NV_UNIQUE_NAME, 0));
2548 2548
2549 2549 if (flags->canmountoff) {
2550 2550 VERIFY(0 == nvlist_add_uint64(props,
2551 2551 zfs_prop_to_name(ZFS_PROP_CANMOUNT), 0));
2552 2552 }
2553 2553 ret = zcmd_write_src_nvlist(hdl, &zc, props);
2554 2554 if (err)
2555 2555 nvlist_free(props);
2556 2556
2557 2557 if (0 == nvlist_lookup_nvlist(fs, "snapprops", &props)) {
2558 2558 VERIFY(0 == nvlist_lookup_nvlist(props,
2559 2559 snapname, &snapprops_nvlist));
2560 2560 }
2561 2561
2562 2562 if (ret != 0)
2563 2563 return (-1);
2564 2564 }
2565 2565
2566 2566 cp = NULL;
2567 2567
2568 2568 /*
2569 2569 * Determine how much of the snapshot name stored in the stream
2570 2570 * we are going to tack on to the name they specified on the
2571 2571 * command line, and how much we are going to chop off.
2572 2572 *
2573 2573 * If they specified a snapshot, chop the entire name stored in
2574 2574 * the stream.
2575 2575 */
2576 2576 if (flags->istail) {
2577 2577 /*
2578 2578 * A filesystem was specified with -e. We want to tack on only
2579 2579 * the tail of the sent snapshot path.
2580 2580 */
2581 2581 if (strchr(tosnap, '@')) {
2582 2582 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "invalid "
2583 2583 "argument - snapshot not allowed with -e"));
2584 2584 return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf));
2585 2585 }
2586 2586
2587 2587 chopprefix = strrchr(sendfs, '/');
2588 2588
2589 2589 if (chopprefix == NULL) {
2590 2590 /*
2591 2591 * The tail is the poolname, so we need to
2592 2592 * prepend a path separator.
2593 2593 */
2594 2594 int len = strlen(drrb->drr_toname);
2595 2595 cp = malloc(len + 2);
2596 2596 cp[0] = '/';
2597 2597 (void) strcpy(&cp[1], drrb->drr_toname);
2598 2598 chopprefix = cp;
2599 2599 } else {
2600 2600 chopprefix = drrb->drr_toname + (chopprefix - sendfs);
2601 2601 }
2602 2602 } else if (flags->isprefix) {
2603 2603 /*
2604 2604 * A filesystem was specified with -d. We want to tack on
2605 2605 * everything but the first element of the sent snapshot path
2606 2606 * (all but the pool name).
2607 2607 */
2608 2608 if (strchr(tosnap, '@')) {
2609 2609 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "invalid "
2610 2610 "argument - snapshot not allowed with -d"));
2611 2611 return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf));
2612 2612 }
2613 2613
2614 2614 chopprefix = strchr(drrb->drr_toname, '/');
2615 2615 if (chopprefix == NULL)
2616 2616 chopprefix = strchr(drrb->drr_toname, '@');
2617 2617 } else if (strchr(tosnap, '@') == NULL) {
2618 2618 /*
2619 2619 * If a filesystem was specified without -d or -e, we want to
2620 2620 * tack on everything after the fs specified by 'zfs send'.
2621 2621 */
2622 2622 chopprefix = drrb->drr_toname + strlen(sendfs);
2623 2623 } else {
2624 2624 /* A snapshot was specified as an exact path (no -d or -e). */
2625 2625 if (recursive) {
2626 2626 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
2627 2627 "cannot specify snapshot name for multi-snapshot "
2628 2628 "stream"));
2629 2629 return (zfs_error(hdl, EZFS_BADSTREAM, errbuf));
2630 2630 }
2631 2631 chopprefix = drrb->drr_toname + strlen(drrb->drr_toname);
2632 2632 }
2633 2633
2634 2634 ASSERT(strstr(drrb->drr_toname, sendfs) == drrb->drr_toname);
2635 2635 ASSERT(chopprefix > drrb->drr_toname);
2636 2636 ASSERT(chopprefix <= drrb->drr_toname + strlen(drrb->drr_toname));
2637 2637 ASSERT(chopprefix[0] == '/' || chopprefix[0] == '@' ||
2638 2638 chopprefix[0] == '\0');
2639 2639
2640 2640 /*
2641 2641 * Determine name of destination snapshot, store in zc_value.
2642 2642 */
2643 2643 (void) strcpy(zc.zc_value, tosnap);
2644 2644 (void) strncat(zc.zc_value, chopprefix, sizeof (zc.zc_value));
2645 2645 free(cp);
2646 2646 if (!zfs_name_valid(zc.zc_value, ZFS_TYPE_SNAPSHOT)) {
2647 2647 zcmd_free_nvlists(&zc);
2648 2648 return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf));
2649 2649 }
2650 2650
2651 2651 /*
2652 2652 * Determine the name of the origin snapshot, store in zc_string.
2653 2653 */
2654 2654 if (drrb->drr_flags & DRR_FLAG_CLONE) {
2655 2655 if (guid_to_name(hdl, zc.zc_value,
2656 2656 drrb->drr_fromguid, zc.zc_string) != 0) {
2657 2657 zcmd_free_nvlists(&zc);
2658 2658 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
2659 2659 "local origin for clone %s does not exist"),
2660 2660 zc.zc_value);
2661 2661 return (zfs_error(hdl, EZFS_NOENT, errbuf));
2662 2662 }
2663 2663 if (flags->verbose)
2664 2664 (void) printf("found clone origin %s\n", zc.zc_string);
2665 2665 }
2666 2666
2667 2667 stream_wantsnewfs = (drrb->drr_fromguid == NULL ||
2668 2668 (drrb->drr_flags & DRR_FLAG_CLONE));
2669 2669
2670 2670 if (stream_wantsnewfs) {
2671 2671 /*
2672 2672 * if the parent fs does not exist, look for it based on
2673 2673 * the parent snap GUID
2674 2674 */
2675 2675 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
2676 2676 "cannot receive new filesystem stream"));
2677 2677
2678 2678 (void) strcpy(zc.zc_name, zc.zc_value);
2679 2679 cp = strrchr(zc.zc_name, '/');
2680 2680 if (cp)
2681 2681 *cp = '\0';
2682 2682 if (cp &&
2683 2683 !zfs_dataset_exists(hdl, zc.zc_name, ZFS_TYPE_DATASET)) {
2684 2684 char suffix[ZFS_MAXNAMELEN];
2685 2685 (void) strcpy(suffix, strrchr(zc.zc_value, '/'));
2686 2686 if (guid_to_name(hdl, zc.zc_name, parent_snapguid,
2687 2687 zc.zc_value) == 0) {
2688 2688 *strchr(zc.zc_value, '@') = '\0';
2689 2689 (void) strcat(zc.zc_value, suffix);
2690 2690 }
2691 2691 }
2692 2692 } else {
2693 2693 /*
2694 2694 * if the fs does not exist, look for it based on the
2695 2695 * fromsnap GUID
2696 2696 */
2697 2697 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
2698 2698 "cannot receive incremental stream"));
2699 2699
2700 2700 (void) strcpy(zc.zc_name, zc.zc_value);
2701 2701 *strchr(zc.zc_name, '@') = '\0';
2702 2702
2703 2703 /*
2704 2704 * If the exact receive path was specified and this is the
2705 2705 * topmost path in the stream, then if the fs does not exist we
2706 2706 * should look no further.
2707 2707 */
2708 2708 if ((flags->isprefix || (*(chopprefix = drrb->drr_toname +
2709 2709 strlen(sendfs)) != '\0' && *chopprefix != '@')) &&
2710 2710 !zfs_dataset_exists(hdl, zc.zc_name, ZFS_TYPE_DATASET)) {
2711 2711 char snap[ZFS_MAXNAMELEN];
2712 2712 (void) strcpy(snap, strchr(zc.zc_value, '@'));
2713 2713 if (guid_to_name(hdl, zc.zc_name, drrb->drr_fromguid,
2714 2714 zc.zc_value) == 0) {
2715 2715 *strchr(zc.zc_value, '@') = '\0';
2716 2716 (void) strcat(zc.zc_value, snap);
2717 2717 }
2718 2718 }
2719 2719 }
2720 2720
2721 2721 (void) strcpy(zc.zc_name, zc.zc_value);
2722 2722 *strchr(zc.zc_name, '@') = '\0';
2723 2723
2724 2724 if (zfs_dataset_exists(hdl, zc.zc_name, ZFS_TYPE_DATASET)) {
2725 2725 zfs_handle_t *zhp;
2726 2726
2727 2727 /*
2728 2728 * Destination fs exists. Therefore this should either
2729 2729 * be an incremental, or the stream specifies a new fs
2730 2730 * (full stream or clone) and they want us to blow it
2731 2731 * away (and have therefore specified -F and removed any
2732 2732 * snapshots).
2733 2733 */
2734 2734 if (stream_wantsnewfs) {
2735 2735 if (!flags->force) {
2736 2736 zcmd_free_nvlists(&zc);
2737 2737 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
2738 2738 "destination '%s' exists\n"
2739 2739 "must specify -F to overwrite it"),
2740 2740 zc.zc_name);
2741 2741 return (zfs_error(hdl, EZFS_EXISTS, errbuf));
2742 2742 }
2743 2743 if (ioctl(hdl->libzfs_fd, ZFS_IOC_SNAPSHOT_LIST_NEXT,
2744 2744 &zc) == 0) {
2745 2745 zcmd_free_nvlists(&zc);
2746 2746 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
2747 2747 "destination has snapshots (eg. %s)\n"
2748 2748 "must destroy them to overwrite it"),
2749 2749 zc.zc_name);
2750 2750 return (zfs_error(hdl, EZFS_EXISTS, errbuf));
2751 2751 }
2752 2752 }
2753 2753
2754 2754 if ((zhp = zfs_open(hdl, zc.zc_name,
2755 2755 ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME)) == NULL) {
2756 2756 zcmd_free_nvlists(&zc);
2757 2757 return (-1);
2758 2758 }
2759 2759
2760 2760 if (stream_wantsnewfs &&
2761 2761 zhp->zfs_dmustats.dds_origin[0]) {
2762 2762 zcmd_free_nvlists(&zc);
2763 2763 zfs_close(zhp);
2764 2764 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
2765 2765 "destination '%s' is a clone\n"
2766 2766 "must destroy it to overwrite it"),
2767 2767 zc.zc_name);
2768 2768 return (zfs_error(hdl, EZFS_EXISTS, errbuf));
2769 2769 }
2770 2770
2771 2771 if (!flags->dryrun && zhp->zfs_type == ZFS_TYPE_FILESYSTEM &&
2772 2772 stream_wantsnewfs) {
2773 2773 /* We can't do online recv in this case */
2774 2774 clp = changelist_gather(zhp, ZFS_PROP_NAME, 0, 0);
2775 2775 if (clp == NULL) {
2776 2776 zfs_close(zhp);
2777 2777 zcmd_free_nvlists(&zc);
2778 2778 return (-1);
2779 2779 }
2780 2780 if (changelist_prefix(clp) != 0) {
2781 2781 changelist_free(clp);
2782 2782 zfs_close(zhp);
2783 2783 zcmd_free_nvlists(&zc);
2784 2784 return (-1);
2785 2785 }
2786 2786 }
2787 2787 zfs_close(zhp);
2788 2788 } else {
2789 2789 /*
2790 2790 * Destination filesystem does not exist. Therefore we better
2791 2791 * be creating a new filesystem (either from a full backup, or
2792 2792 * a clone). It would therefore be invalid if the user
2793 2793 * specified only the pool name (i.e. if the destination name
2794 2794 * contained no slash character).
2795 2795 */
2796 2796 if (!stream_wantsnewfs ||
2797 2797 (cp = strrchr(zc.zc_name, '/')) == NULL) {
2798 2798 zcmd_free_nvlists(&zc);
2799 2799 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
2800 2800 "destination '%s' does not exist"), zc.zc_name);
2801 2801 return (zfs_error(hdl, EZFS_NOENT, errbuf));
2802 2802 }
2803 2803
2804 2804 /*
2805 2805 * Trim off the final dataset component so we perform the
2806 2806 * recvbackup ioctl to the filesystems's parent.
2807 2807 */
2808 2808 *cp = '\0';
2809 2809
2810 2810 if (flags->isprefix && !flags->istail && !flags->dryrun &&
2811 2811 create_parents(hdl, zc.zc_value, strlen(tosnap)) != 0) {
2812 2812 zcmd_free_nvlists(&zc);
2813 2813 return (zfs_error(hdl, EZFS_BADRESTORE, errbuf));
2814 2814 }
2815 2815
2816 2816 newfs = B_TRUE;
2817 2817 }
2818 2818
2819 2819 zc.zc_begin_record = drr_noswap->drr_u.drr_begin;
2820 2820 zc.zc_cookie = infd;
2821 2821 zc.zc_guid = flags->force;
2822 2822 if (flags->verbose) {
2823 2823 (void) printf("%s %s stream of %s into %s\n",
2824 2824 flags->dryrun ? "would receive" : "receiving",
2825 2825 drrb->drr_fromguid ? "incremental" : "full",
2826 2826 drrb->drr_toname, zc.zc_value);
2827 2827 (void) fflush(stdout);
2828 2828 }
2829 2829
2830 2830 if (flags->dryrun) {
2831 2831 zcmd_free_nvlists(&zc);
2832 2832 return (recv_skip(hdl, infd, flags->byteswap));
2833 2833 }
2834 2834
2835 2835 zc.zc_nvlist_dst = (uint64_t)(uintptr_t)prop_errbuf;
2836 2836 zc.zc_nvlist_dst_size = sizeof (prop_errbuf);
2837 2837 zc.zc_cleanup_fd = cleanup_fd;
2838 2838 zc.zc_action_handle = *action_handlep;
2839 2839
2840 2840 err = ioctl_err = zfs_ioctl(hdl, ZFS_IOC_RECV, &zc);
2841 2841 ioctl_errno = errno;
2842 2842 prop_errflags = (zprop_errflags_t)zc.zc_obj;
2843 2843
2844 2844 if (err == 0) {
2845 2845 nvlist_t *prop_errors;
2846 2846 VERIFY(0 == nvlist_unpack((void *)(uintptr_t)zc.zc_nvlist_dst,
2847 2847 zc.zc_nvlist_dst_size, &prop_errors, 0));
2848 2848
2849 2849 nvpair_t *prop_err = NULL;
2850 2850
2851 2851 while ((prop_err = nvlist_next_nvpair(prop_errors,
2852 2852 prop_err)) != NULL) {
2853 2853 char tbuf[1024];
2854 2854 zfs_prop_t prop;
2855 2855 int intval;
2856 2856
2857 2857 prop = zfs_name_to_prop(nvpair_name(prop_err));
2858 2858 (void) nvpair_value_int32(prop_err, &intval);
2859 2859 if (strcmp(nvpair_name(prop_err),
2860 2860 ZPROP_N_MORE_ERRORS) == 0) {
2861 2861 trunc_prop_errs(intval);
2862 2862 break;
2863 2863 } else {
2864 2864 (void) snprintf(tbuf, sizeof (tbuf),
2865 2865 dgettext(TEXT_DOMAIN,
2866 2866 "cannot receive %s property on %s"),
2867 2867 nvpair_name(prop_err), zc.zc_name);
2868 2868 zfs_setprop_error(hdl, prop, intval, tbuf);
2869 2869 }
2870 2870 }
2871 2871 nvlist_free(prop_errors);
2872 2872 }
2873 2873
2874 2874 zc.zc_nvlist_dst = 0;
2875 2875 zc.zc_nvlist_dst_size = 0;
2876 2876 zcmd_free_nvlists(&zc);
2877 2877
2878 2878 if (err == 0 && snapprops_nvlist) {
2879 2879 zfs_cmd_t zc2 = { 0 };
2880 2880
2881 2881 (void) strcpy(zc2.zc_name, zc.zc_value);
2882 2882 zc2.zc_cookie = B_TRUE; /* received */
2883 2883 if (zcmd_write_src_nvlist(hdl, &zc2, snapprops_nvlist) == 0) {
2884 2884 (void) zfs_ioctl(hdl, ZFS_IOC_SET_PROP, &zc2);
2885 2885 zcmd_free_nvlists(&zc2);
2886 2886 }
2887 2887 }
2888 2888
2889 2889 if (err && (ioctl_errno == ENOENT || ioctl_errno == EEXIST)) {
2890 2890 /*
2891 2891 * It may be that this snapshot already exists,
2892 2892 * in which case we want to consume & ignore it
2893 2893 * rather than failing.
2894 2894 */
2895 2895 avl_tree_t *local_avl;
2896 2896 nvlist_t *local_nv, *fs;
2897 2897 cp = strchr(zc.zc_value, '@');
2898 2898
2899 2899 /*
2900 2900 * XXX Do this faster by just iterating over snaps in
2901 2901 * this fs. Also if zc_value does not exist, we will
2902 2902 * get a strange "does not exist" error message.
2903 2903 */
2904 2904 *cp = '\0';
2905 2905 if (gather_nvlist(hdl, zc.zc_value, NULL, NULL, B_FALSE,
2906 2906 &local_nv, &local_avl) == 0) {
2907 2907 *cp = '@';
2908 2908 fs = fsavl_find(local_avl, drrb->drr_toguid, NULL);
2909 2909 fsavl_destroy(local_avl);
2910 2910 nvlist_free(local_nv);
2911 2911
2912 2912 if (fs != NULL) {
2913 2913 if (flags->verbose) {
2914 2914 (void) printf("snap %s already exists; "
2915 2915 "ignoring\n", zc.zc_value);
2916 2916 }
2917 2917 err = ioctl_err = recv_skip(hdl, infd,
2918 2918 flags->byteswap);
2919 2919 }
2920 2920 }
2921 2921 *cp = '@';
2922 2922 }
2923 2923
2924 2924 if (ioctl_err != 0) {
2925 2925 switch (ioctl_errno) {
2926 2926 case ENODEV:
2927 2927 cp = strchr(zc.zc_value, '@');
2928 2928 *cp = '\0';
2929 2929 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
2930 2930 "most recent snapshot of %s does not\n"
2931 2931 "match incremental source"), zc.zc_value);
2932 2932 (void) zfs_error(hdl, EZFS_BADRESTORE, errbuf);
2933 2933 *cp = '@';
2934 2934 break;
2935 2935 case ETXTBSY:
2936 2936 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
2937 2937 "destination %s has been modified\n"
2938 2938 "since most recent snapshot"), zc.zc_name);
2939 2939 (void) zfs_error(hdl, EZFS_BADRESTORE, errbuf);
2940 2940 break;
2941 2941 case EEXIST:
2942 2942 cp = strchr(zc.zc_value, '@');
2943 2943 if (newfs) {
2944 2944 /* it's the containing fs that exists */
2945 2945 *cp = '\0';
2946 2946 }
2947 2947 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
2948 2948 "destination already exists"));
2949 2949 (void) zfs_error_fmt(hdl, EZFS_EXISTS,
2950 2950 dgettext(TEXT_DOMAIN, "cannot restore to %s"),
2951 2951 zc.zc_value);
2952 2952 *cp = '@';
2953 2953 break;
2954 2954 case EINVAL:
2955 2955 (void) zfs_error(hdl, EZFS_BADSTREAM, errbuf);
2956 2956 break;
2957 2957 case ECKSUM:
2958 2958 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
2959 2959 "invalid stream (checksum mismatch)"));
2960 2960 (void) zfs_error(hdl, EZFS_BADSTREAM, errbuf);
2961 2961 break;
2962 2962 case ENOTSUP:
2963 2963 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
2964 2964 "pool must be upgraded to receive this stream."));
2965 2965 (void) zfs_error(hdl, EZFS_BADVERSION, errbuf);
2966 2966 break;
2967 2967 case EDQUOT:
2968 2968 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
2969 2969 "destination %s space quota exceeded"), zc.zc_name);
2970 2970 (void) zfs_error(hdl, EZFS_NOSPC, errbuf);
2971 2971 break;
2972 2972 default:
2973 2973 (void) zfs_standard_error(hdl, ioctl_errno, errbuf);
2974 2974 }
2975 2975 }
2976 2976
2977 2977 /*
2978 2978 * Mount the target filesystem (if created). Also mount any
2979 2979 * children of the target filesystem if we did a replication
2980 2980 * receive (indicated by stream_avl being non-NULL).
2981 2981 */
2982 2982 cp = strchr(zc.zc_value, '@');
2983 2983 if (cp && (ioctl_err == 0 || !newfs)) {
2984 2984 zfs_handle_t *h;
2985 2985
2986 2986 *cp = '\0';
2987 2987 h = zfs_open(hdl, zc.zc_value,
2988 2988 ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME);
2989 2989 if (h != NULL) {
2990 2990 if (h->zfs_type == ZFS_TYPE_VOLUME) {
2991 2991 *cp = '@';
2992 2992 } else if (newfs || stream_avl) {
2993 2993 /*
2994 2994 * Track the first/top of hierarchy fs,
2995 2995 * for mounting and sharing later.
2996 2996 */
2997 2997 if (top_zfs && *top_zfs == NULL)
2998 2998 *top_zfs = zfs_strdup(hdl, zc.zc_value);
2999 2999 }
3000 3000 zfs_close(h);
3001 3001 }
3002 3002 *cp = '@';
3003 3003 }
3004 3004
3005 3005 if (clp) {
3006 3006 err |= changelist_postfix(clp);
3007 3007 changelist_free(clp);
3008 3008 }
3009 3009
3010 3010 if (prop_errflags & ZPROP_ERR_NOCLEAR) {
3011 3011 (void) fprintf(stderr, dgettext(TEXT_DOMAIN, "Warning: "
3012 3012 "failed to clear unreceived properties on %s"),
3013 3013 zc.zc_name);
3014 3014 (void) fprintf(stderr, "\n");
3015 3015 }
3016 3016 if (prop_errflags & ZPROP_ERR_NORESTORE) {
3017 3017 (void) fprintf(stderr, dgettext(TEXT_DOMAIN, "Warning: "
3018 3018 "failed to restore original properties on %s"),
3019 3019 zc.zc_name);
3020 3020 (void) fprintf(stderr, "\n");
3021 3021 }
3022 3022
3023 3023 if (err || ioctl_err)
3024 3024 return (-1);
3025 3025
3026 3026 *action_handlep = zc.zc_action_handle;
3027 3027
3028 3028 if (flags->verbose) {
3029 3029 char buf1[64];
3030 3030 char buf2[64];
3031 3031 uint64_t bytes = zc.zc_cookie;
3032 3032 time_t delta = time(NULL) - begin_time;
3033 3033 if (delta == 0)
3034 3034 delta = 1;
3035 3035 zfs_nicenum(bytes, buf1, sizeof (buf1));
3036 3036 zfs_nicenum(bytes/delta, buf2, sizeof (buf1));
3037 3037
3038 3038 (void) printf("received %sB stream in %lu seconds (%sB/sec)\n",
3039 3039 buf1, delta, buf2);
3040 3040 }
3041 3041
3042 3042 return (0);
3043 3043 }
3044 3044
3045 3045 static int
3046 3046 zfs_receive_impl(libzfs_handle_t *hdl, const char *tosnap, recvflags_t *flags,
3047 3047 int infd, const char *sendfs, nvlist_t *stream_nv, avl_tree_t *stream_avl,
3048 3048 char **top_zfs, int cleanup_fd, uint64_t *action_handlep)
3049 3049 {
3050 3050 int err;
3051 3051 dmu_replay_record_t drr, drr_noswap;
3052 3052 struct drr_begin *drrb = &drr.drr_u.drr_begin;
3053 3053 char errbuf[1024];
3054 3054 zio_cksum_t zcksum = { 0 };
3055 3055 uint64_t featureflags;
3056 3056 int hdrtype;
3057 3057
3058 3058 (void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
3059 3059 "cannot receive"));
3060 3060
3061 3061 if (flags->isprefix &&
3062 3062 !zfs_dataset_exists(hdl, tosnap, ZFS_TYPE_DATASET)) {
3063 3063 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "specified fs "
3064 3064 "(%s) does not exist"), tosnap);
3065 3065 return (zfs_error(hdl, EZFS_NOENT, errbuf));
3066 3066 }
3067 3067
3068 3068 /* read in the BEGIN record */
3069 3069 if (0 != (err = recv_read(hdl, infd, &drr, sizeof (drr), B_FALSE,
3070 3070 &zcksum)))
3071 3071 return (err);
3072 3072
3073 3073 if (drr.drr_type == DRR_END || drr.drr_type == BSWAP_32(DRR_END)) {
3074 3074 /* It's the double end record at the end of a package */
3075 3075 return (ENODATA);
3076 3076 }
3077 3077
3078 3078 /* the kernel needs the non-byteswapped begin record */
3079 3079 drr_noswap = drr;
3080 3080
3081 3081 flags->byteswap = B_FALSE;
3082 3082 if (drrb->drr_magic == BSWAP_64(DMU_BACKUP_MAGIC)) {
3083 3083 /*
3084 3084 * We computed the checksum in the wrong byteorder in
3085 3085 * recv_read() above; do it again correctly.
3086 3086 */
3087 3087 bzero(&zcksum, sizeof (zio_cksum_t));
3088 3088 fletcher_4_incremental_byteswap(&drr, sizeof (drr), &zcksum);
3089 3089 flags->byteswap = B_TRUE;
3090 3090
3091 3091 drr.drr_type = BSWAP_32(drr.drr_type);
3092 3092 drr.drr_payloadlen = BSWAP_32(drr.drr_payloadlen);
3093 3093 drrb->drr_magic = BSWAP_64(drrb->drr_magic);
3094 3094 drrb->drr_versioninfo = BSWAP_64(drrb->drr_versioninfo);
3095 3095 drrb->drr_creation_time = BSWAP_64(drrb->drr_creation_time);
3096 3096 drrb->drr_type = BSWAP_32(drrb->drr_type);
3097 3097 drrb->drr_flags = BSWAP_32(drrb->drr_flags);
3098 3098 drrb->drr_toguid = BSWAP_64(drrb->drr_toguid);
3099 3099 drrb->drr_fromguid = BSWAP_64(drrb->drr_fromguid);
3100 3100 }
3101 3101
3102 3102 if (drrb->drr_magic != DMU_BACKUP_MAGIC || drr.drr_type != DRR_BEGIN) {
3103 3103 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "invalid "
3104 3104 "stream (bad magic number)"));
3105 3105 return (zfs_error(hdl, EZFS_BADSTREAM, errbuf));
3106 3106 }
3107 3107
3108 3108 featureflags = DMU_GET_FEATUREFLAGS(drrb->drr_versioninfo);
3109 3109 hdrtype = DMU_GET_STREAM_HDRTYPE(drrb->drr_versioninfo);
3110 3110
3111 3111 if (!DMU_STREAM_SUPPORTED(featureflags) ||
3112 3112 (hdrtype != DMU_SUBSTREAM && hdrtype != DMU_COMPOUNDSTREAM)) {
3113 3113 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
3114 3114 "stream has unsupported feature, feature flags = %lx"),
3115 3115 featureflags);
3116 3116 return (zfs_error(hdl, EZFS_BADSTREAM, errbuf));
3117 3117 }
3118 3118
3119 3119 if (strchr(drrb->drr_toname, '@') == NULL) {
3120 3120 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "invalid "
3121 3121 "stream (bad snapshot name)"));
3122 3122 return (zfs_error(hdl, EZFS_BADSTREAM, errbuf));
3123 3123 }
3124 3124
3125 3125 if (DMU_GET_STREAM_HDRTYPE(drrb->drr_versioninfo) == DMU_SUBSTREAM) {
3126 3126 char nonpackage_sendfs[ZFS_MAXNAMELEN];
3127 3127 if (sendfs == NULL) {
3128 3128 /*
3129 3129 * We were not called from zfs_receive_package(). Get
3130 3130 * the fs specified by 'zfs send'.
3131 3131 */
3132 3132 char *cp;
3133 3133 (void) strlcpy(nonpackage_sendfs,
3134 3134 drr.drr_u.drr_begin.drr_toname, ZFS_MAXNAMELEN);
3135 3135 if ((cp = strchr(nonpackage_sendfs, '@')) != NULL)
3136 3136 *cp = '\0';
3137 3137 sendfs = nonpackage_sendfs;
3138 3138 }
3139 3139 return (zfs_receive_one(hdl, infd, tosnap, flags,
3140 3140 &drr, &drr_noswap, sendfs, stream_nv, stream_avl,
3141 3141 top_zfs, cleanup_fd, action_handlep));
3142 3142 } else {
3143 3143 assert(DMU_GET_STREAM_HDRTYPE(drrb->drr_versioninfo) ==
3144 3144 DMU_COMPOUNDSTREAM);
3145 3145 return (zfs_receive_package(hdl, infd, tosnap, flags,
3146 3146 &drr, &zcksum, top_zfs, cleanup_fd, action_handlep));
3147 3147 }
3148 3148 }
3149 3149
3150 3150 /*
3151 3151 * Restores a backup of tosnap from the file descriptor specified by infd.
3152 3152 * Return 0 on total success, -2 if some things couldn't be
3153 3153 * destroyed/renamed/promoted, -1 if some things couldn't be received.
3154 3154 * (-1 will override -2).
3155 3155 */
3156 3156 int
3157 3157 zfs_receive(libzfs_handle_t *hdl, const char *tosnap, recvflags_t *flags,
3158 3158 int infd, avl_tree_t *stream_avl)
3159 3159 {
3160 3160 char *top_zfs = NULL;
3161 3161 int err;
3162 3162 int cleanup_fd;
3163 3163 uint64_t action_handle = 0;
3164 3164
3165 3165 cleanup_fd = open(ZFS_DEV, O_RDWR|O_EXCL);
3166 3166 VERIFY(cleanup_fd >= 0);
3167 3167
3168 3168 err = zfs_receive_impl(hdl, tosnap, flags, infd, NULL, NULL,
3169 3169 stream_avl, &top_zfs, cleanup_fd, &action_handle);
3170 3170
3171 3171 VERIFY(0 == close(cleanup_fd));
3172 3172
3173 3173 if (err == 0 && !flags->nomount && top_zfs) {
3174 3174 zfs_handle_t *zhp;
3175 3175 prop_changelist_t *clp;
3176 3176
3177 3177 zhp = zfs_open(hdl, top_zfs, ZFS_TYPE_FILESYSTEM);
3178 3178 if (zhp != NULL) {
3179 3179 clp = changelist_gather(zhp, ZFS_PROP_MOUNTPOINT,
3180 3180 CL_GATHER_MOUNT_ALWAYS, 0);
3181 3181 zfs_close(zhp);
3182 3182 if (clp != NULL) {
3183 3183 /* mount and share received datasets */
3184 3184 err = changelist_postfix(clp);
3185 3185 changelist_free(clp);
3186 3186 }
3187 3187 }
3188 3188 if (zhp == NULL || clp == NULL || err)
3189 3189 err = -1;
3190 3190 }
3191 3191 if (top_zfs)
3192 3192 free(top_zfs);
3193 3193
3194 3194 return (err);
3195 3195 }
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