1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
23 * Copyright 2011 Nexenta Systems, Inc. All rights reserved.
24 * Copyright (c) 2013 by Delphix. All rights reserved.
25 * Copyright (c) 2014, Joyent, Inc. All rights reserved.
26 * Copyright (c) 2012, Martin Matuska <mm@FreeBSD.org>. All rights reserved.
27 */
28
29 #include <sys/dmu.h>
30 #include <sys/dmu_impl.h>
31 #include <sys/dmu_tx.h>
32 #include <sys/dbuf.h>
33 #include <sys/dnode.h>
34 #include <sys/zfs_context.h>
35 #include <sys/dmu_objset.h>
36 #include <sys/dmu_traverse.h>
37 #include <sys/dsl_dataset.h>
38 #include <sys/dsl_dir.h>
39 #include <sys/dsl_prop.h>
40 #include <sys/dsl_pool.h>
41 #include <sys/dsl_synctask.h>
42 #include <sys/zfs_ioctl.h>
43 #include <sys/zap.h>
44 #include <sys/zio_checksum.h>
45 #include <sys/zfs_znode.h>
46 #include <zfs_fletcher.h>
47 #include <sys/avl.h>
48 #include <sys/ddt.h>
49 #include <sys/zfs_onexit.h>
50 #include <sys/dmu_send.h>
51 #include <sys/dsl_destroy.h>
52 #include <sys/dsl_bookmark.h>
53
54 /* Set this tunable to TRUE to replace corrupt data with 0x2f5baddb10c */
55 int zfs_send_corrupt_data = B_FALSE;
56
57 static char *dmu_recv_tag = "dmu_recv_tag";
58 static const char *recv_clone_name = "%recv";
59
60 static int
dump_bytes(dmu_sendarg_t * dsp,void * buf,int len)61 dump_bytes(dmu_sendarg_t *dsp, void *buf, int len)
62 {
63 dsl_dataset_t *ds = dsp->dsa_os->os_dsl_dataset;
64 struct uio auio;
65 struct iovec aiov;
66 ASSERT0(len % 8);
67
68 fletcher_4_incremental_native(buf, len, &dsp->dsa_zc);
69 aiov.iov_base = buf;
70 aiov.iov_len = len;
71 auio.uio_iov = &aiov;
72 auio.uio_iovcnt = 1;
73 auio.uio_resid = len;
74 auio.uio_segflg = UIO_SYSSPACE;
75 auio.uio_rw = UIO_WRITE;
76 auio.uio_offset = (off_t)-1;
77 auio.uio_td = dsp->dsa_td;
78 #ifdef _KERNEL
79 if (dsp->dsa_fp->f_type == DTYPE_VNODE)
80 bwillwrite();
81 dsp->dsa_err = fo_write(dsp->dsa_fp, &auio, dsp->dsa_td->td_ucred, 0,
82 dsp->dsa_td);
83 #else
84 fprintf(stderr, "%s: returning EOPNOTSUPP\n", __func__);
85 dsp->dsa_err = EOPNOTSUPP;
86 #endif
87 mutex_enter(&ds->ds_sendstream_lock);
88 *dsp->dsa_off += len;
89 mutex_exit(&ds->ds_sendstream_lock);
90
91 return (dsp->dsa_err);
92 }
93
94 static int
dump_free(dmu_sendarg_t * dsp,uint64_t object,uint64_t offset,uint64_t length)95 dump_free(dmu_sendarg_t *dsp, uint64_t object, uint64_t offset,
96 uint64_t length)
97 {
98 struct drr_free *drrf = &(dsp->dsa_drr->drr_u.drr_free);
99
100 /*
101 * When we receive a free record, dbuf_free_range() assumes
102 * that the receiving system doesn't have any dbufs in the range
103 * being freed. This is always true because there is a one-record
104 * constraint: we only send one WRITE record for any given
105 * object+offset. We know that the one-record constraint is
106 * true because we always send data in increasing order by
107 * object,offset.
108 *
109 * If the increasing-order constraint ever changes, we should find
110 * another way to assert that the one-record constraint is still
111 * satisfied.
112 */
113 ASSERT(object > dsp->dsa_last_data_object ||
114 (object == dsp->dsa_last_data_object &&
115 offset > dsp->dsa_last_data_offset));
116
117 /*
118 * If we are doing a non-incremental send, then there can't
119 * be any data in the dataset we're receiving into. Therefore
120 * a free record would simply be a no-op. Save space by not
121 * sending it to begin with.
122 */
123 if (!dsp->dsa_incremental)
124 return (0);
125
126 if (length != -1ULL && offset + length < offset)
127 length = -1ULL;
128
129 /*
130 * If there is a pending op, but it's not PENDING_FREE, push it out,
131 * since free block aggregation can only be done for blocks of the
132 * same type (i.e., DRR_FREE records can only be aggregated with
133 * other DRR_FREE records. DRR_FREEOBJECTS records can only be
134 * aggregated with other DRR_FREEOBJECTS records.
135 */
136 if (dsp->dsa_pending_op != PENDING_NONE &&
137 dsp->dsa_pending_op != PENDING_FREE) {
138 if (dump_bytes(dsp, dsp->dsa_drr,
139 sizeof (dmu_replay_record_t)) != 0)
140 return (SET_ERROR(EINTR));
141 dsp->dsa_pending_op = PENDING_NONE;
142 }
143
144 if (dsp->dsa_pending_op == PENDING_FREE) {
145 /*
146 * There should never be a PENDING_FREE if length is -1
147 * (because dump_dnode is the only place where this
148 * function is called with a -1, and only after flushing
149 * any pending record).
150 */
151 ASSERT(length != -1ULL);
152 /*
153 * Check to see whether this free block can be aggregated
154 * with pending one.
155 */
156 if (drrf->drr_object == object && drrf->drr_offset +
157 drrf->drr_length == offset) {
158 drrf->drr_length += length;
159 return (0);
160 } else {
161 /* not a continuation. Push out pending record */
162 if (dump_bytes(dsp, dsp->dsa_drr,
163 sizeof (dmu_replay_record_t)) != 0)
164 return (SET_ERROR(EINTR));
165 dsp->dsa_pending_op = PENDING_NONE;
166 }
167 }
168 /* create a FREE record and make it pending */
169 bzero(dsp->dsa_drr, sizeof (dmu_replay_record_t));
170 dsp->dsa_drr->drr_type = DRR_FREE;
171 drrf->drr_object = object;
172 drrf->drr_offset = offset;
173 drrf->drr_length = length;
174 drrf->drr_toguid = dsp->dsa_toguid;
175 if (length == -1ULL) {
176 if (dump_bytes(dsp, dsp->dsa_drr,
177 sizeof (dmu_replay_record_t)) != 0)
178 return (SET_ERROR(EINTR));
179 } else {
180 dsp->dsa_pending_op = PENDING_FREE;
181 }
182
183 return (0);
184 }
185
186 static int
dump_data(dmu_sendarg_t * dsp,dmu_object_type_t type,uint64_t object,uint64_t offset,int blksz,const blkptr_t * bp,void * data)187 dump_data(dmu_sendarg_t *dsp, dmu_object_type_t type,
188 uint64_t object, uint64_t offset, int blksz, const blkptr_t *bp, void *data)
189 {
190 struct drr_write *drrw = &(dsp->dsa_drr->drr_u.drr_write);
191
192 /*
193 * We send data in increasing object, offset order.
194 * See comment in dump_free() for details.
195 */
196 ASSERT(object > dsp->dsa_last_data_object ||
197 (object == dsp->dsa_last_data_object &&
198 offset > dsp->dsa_last_data_offset));
199 dsp->dsa_last_data_object = object;
200 dsp->dsa_last_data_offset = offset + blksz - 1;
201
202 /*
203 * If there is any kind of pending aggregation (currently either
204 * a grouping of free objects or free blocks), push it out to
205 * the stream, since aggregation can't be done across operations
206 * of different types.
207 */
208 if (dsp->dsa_pending_op != PENDING_NONE) {
209 if (dump_bytes(dsp, dsp->dsa_drr,
210 sizeof (dmu_replay_record_t)) != 0)
211 return (SET_ERROR(EINTR));
212 dsp->dsa_pending_op = PENDING_NONE;
213 }
214 /* write a DATA record */
215 bzero(dsp->dsa_drr, sizeof (dmu_replay_record_t));
216 dsp->dsa_drr->drr_type = DRR_WRITE;
217 drrw->drr_object = object;
218 drrw->drr_type = type;
219 drrw->drr_offset = offset;
220 drrw->drr_length = blksz;
221 drrw->drr_toguid = dsp->dsa_toguid;
222 drrw->drr_checksumtype = BP_GET_CHECKSUM(bp);
223 if (zio_checksum_table[drrw->drr_checksumtype].ci_dedup)
224 drrw->drr_checksumflags |= DRR_CHECKSUM_DEDUP;
225 DDK_SET_LSIZE(&drrw->drr_key, BP_GET_LSIZE(bp));
226 DDK_SET_PSIZE(&drrw->drr_key, BP_GET_PSIZE(bp));
227 DDK_SET_COMPRESS(&drrw->drr_key, BP_GET_COMPRESS(bp));
228 drrw->drr_key.ddk_cksum = bp->blk_cksum;
229
230 if (dump_bytes(dsp, dsp->dsa_drr, sizeof (dmu_replay_record_t)) != 0)
231 return (SET_ERROR(EINTR));
232 if (dump_bytes(dsp, data, blksz) != 0)
233 return (SET_ERROR(EINTR));
234 return (0);
235 }
236
237 static int
dump_spill(dmu_sendarg_t * dsp,uint64_t object,int blksz,void * data)238 dump_spill(dmu_sendarg_t *dsp, uint64_t object, int blksz, void *data)
239 {
240 struct drr_spill *drrs = &(dsp->dsa_drr->drr_u.drr_spill);
241
242 if (dsp->dsa_pending_op != PENDING_NONE) {
243 if (dump_bytes(dsp, dsp->dsa_drr,
244 sizeof (dmu_replay_record_t)) != 0)
245 return (SET_ERROR(EINTR));
246 dsp->dsa_pending_op = PENDING_NONE;
247 }
248
249 /* write a SPILL record */
250 bzero(dsp->dsa_drr, sizeof (dmu_replay_record_t));
251 dsp->dsa_drr->drr_type = DRR_SPILL;
252 drrs->drr_object = object;
253 drrs->drr_length = blksz;
254 drrs->drr_toguid = dsp->dsa_toguid;
255
256 if (dump_bytes(dsp, dsp->dsa_drr, sizeof (dmu_replay_record_t)))
257 return (SET_ERROR(EINTR));
258 if (dump_bytes(dsp, data, blksz))
259 return (SET_ERROR(EINTR));
260 return (0);
261 }
262
263 static int
dump_freeobjects(dmu_sendarg_t * dsp,uint64_t firstobj,uint64_t numobjs)264 dump_freeobjects(dmu_sendarg_t *dsp, uint64_t firstobj, uint64_t numobjs)
265 {
266 struct drr_freeobjects *drrfo = &(dsp->dsa_drr->drr_u.drr_freeobjects);
267
268 /* See comment in dump_free(). */
269 if (!dsp->dsa_incremental)
270 return (0);
271
272 /*
273 * If there is a pending op, but it's not PENDING_FREEOBJECTS,
274 * push it out, since free block aggregation can only be done for
275 * blocks of the same type (i.e., DRR_FREE records can only be
276 * aggregated with other DRR_FREE records. DRR_FREEOBJECTS records
277 * can only be aggregated with other DRR_FREEOBJECTS records.
278 */
279 if (dsp->dsa_pending_op != PENDING_NONE &&
280 dsp->dsa_pending_op != PENDING_FREEOBJECTS) {
281 if (dump_bytes(dsp, dsp->dsa_drr,
282 sizeof (dmu_replay_record_t)) != 0)
283 return (SET_ERROR(EINTR));
284 dsp->dsa_pending_op = PENDING_NONE;
285 }
286 if (dsp->dsa_pending_op == PENDING_FREEOBJECTS) {
287 /*
288 * See whether this free object array can be aggregated
289 * with pending one
290 */
291 if (drrfo->drr_firstobj + drrfo->drr_numobjs == firstobj) {
292 drrfo->drr_numobjs += numobjs;
293 return (0);
294 } else {
295 /* can't be aggregated. Push out pending record */
296 if (dump_bytes(dsp, dsp->dsa_drr,
297 sizeof (dmu_replay_record_t)) != 0)
298 return (SET_ERROR(EINTR));
299 dsp->dsa_pending_op = PENDING_NONE;
300 }
301 }
302
303 /* write a FREEOBJECTS record */
304 bzero(dsp->dsa_drr, sizeof (dmu_replay_record_t));
305 dsp->dsa_drr->drr_type = DRR_FREEOBJECTS;
306 drrfo->drr_firstobj = firstobj;
307 drrfo->drr_numobjs = numobjs;
308 drrfo->drr_toguid = dsp->dsa_toguid;
309
310 dsp->dsa_pending_op = PENDING_FREEOBJECTS;
311
312 return (0);
313 }
314
315 static int
dump_dnode(dmu_sendarg_t * dsp,uint64_t object,dnode_phys_t * dnp)316 dump_dnode(dmu_sendarg_t *dsp, uint64_t object, dnode_phys_t *dnp)
317 {
318 struct drr_object *drro = &(dsp->dsa_drr->drr_u.drr_object);
319
320 if (dnp == NULL || dnp->dn_type == DMU_OT_NONE)
321 return (dump_freeobjects(dsp, object, 1));
322
323 if (dsp->dsa_pending_op != PENDING_NONE) {
324 if (dump_bytes(dsp, dsp->dsa_drr,
325 sizeof (dmu_replay_record_t)) != 0)
326 return (SET_ERROR(EINTR));
327 dsp->dsa_pending_op = PENDING_NONE;
328 }
329
330 /* write an OBJECT record */
331 bzero(dsp->dsa_drr, sizeof (dmu_replay_record_t));
332 dsp->dsa_drr->drr_type = DRR_OBJECT;
333 drro->drr_object = object;
334 drro->drr_type = dnp->dn_type;
335 drro->drr_bonustype = dnp->dn_bonustype;
336 drro->drr_blksz = dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT;
337 drro->drr_bonuslen = dnp->dn_bonuslen;
338 drro->drr_checksumtype = dnp->dn_checksum;
339 drro->drr_compress = dnp->dn_compress;
340 drro->drr_toguid = dsp->dsa_toguid;
341
342 if (dump_bytes(dsp, dsp->dsa_drr, sizeof (dmu_replay_record_t)) != 0)
343 return (SET_ERROR(EINTR));
344
345 if (dump_bytes(dsp, DN_BONUS(dnp), P2ROUNDUP(dnp->dn_bonuslen, 8)) != 0)
346 return (SET_ERROR(EINTR));
347
348 /* Free anything past the end of the file. */
349 if (dump_free(dsp, object, (dnp->dn_maxblkid + 1) *
350 (dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT), -1ULL) != 0)
351 return (SET_ERROR(EINTR));
352 if (dsp->dsa_err != 0)
353 return (SET_ERROR(EINTR));
354 return (0);
355 }
356
357 #define BP_SPAN(dnp, level) \
358 (((uint64_t)dnp->dn_datablkszsec) << (SPA_MINBLOCKSHIFT + \
359 (level) * (dnp->dn_indblkshift - SPA_BLKPTRSHIFT)))
360
361 /* ARGSUSED */
362 static int
backup_cb(spa_t * spa,zilog_t * zilog,const blkptr_t * bp,const zbookmark_t * zb,const dnode_phys_t * dnp,void * arg)363 backup_cb(spa_t *spa, zilog_t *zilog, const blkptr_t *bp,
364 const zbookmark_t *zb, const dnode_phys_t *dnp, void *arg)
365 {
366 dmu_sendarg_t *dsp = arg;
367 dmu_object_type_t type = bp ? BP_GET_TYPE(bp) : DMU_OT_NONE;
368 int err = 0;
369
370 if (issig(JUSTLOOKING) && issig(FORREAL))
371 return (SET_ERROR(EINTR));
372
373 if (zb->zb_object != DMU_META_DNODE_OBJECT &&
374 DMU_OBJECT_IS_SPECIAL(zb->zb_object)) {
375 return (0);
376 } else if (zb->zb_level == ZB_ZIL_LEVEL) {
377 /*
378 * If we are sending a non-snapshot (which is allowed on
379 * read-only pools), it may have a ZIL, which must be ignored.
380 */
381 return (0);
382 } else if (BP_IS_HOLE(bp) &&
383 zb->zb_object == DMU_META_DNODE_OBJECT) {
384 uint64_t span = BP_SPAN(dnp, zb->zb_level);
385 uint64_t dnobj = (zb->zb_blkid * span) >> DNODE_SHIFT;
386 err = dump_freeobjects(dsp, dnobj, span >> DNODE_SHIFT);
387 } else if (BP_IS_HOLE(bp)) {
388 uint64_t span = BP_SPAN(dnp, zb->zb_level);
389 err = dump_free(dsp, zb->zb_object, zb->zb_blkid * span, span);
390 } else if (zb->zb_level > 0 || type == DMU_OT_OBJSET) {
391 return (0);
392 } else if (type == DMU_OT_DNODE) {
393 dnode_phys_t *blk;
394 int i;
395 int blksz = BP_GET_LSIZE(bp);
396 uint32_t aflags = ARC_WAIT;
397 arc_buf_t *abuf;
398
399 if (arc_read(NULL, spa, bp, arc_getbuf_func, &abuf,
400 ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL,
401 &aflags, zb) != 0)
402 return (SET_ERROR(EIO));
403
404 blk = abuf->b_data;
405 for (i = 0; i < blksz >> DNODE_SHIFT; i++) {
406 uint64_t dnobj = (zb->zb_blkid <<
407 (DNODE_BLOCK_SHIFT - DNODE_SHIFT)) + i;
408 err = dump_dnode(dsp, dnobj, blk+i);
409 if (err != 0)
410 break;
411 }
412 (void) arc_buf_remove_ref(abuf, &abuf);
413 } else if (type == DMU_OT_SA) {
414 uint32_t aflags = ARC_WAIT;
415 arc_buf_t *abuf;
416 int blksz = BP_GET_LSIZE(bp);
417
418 if (arc_read(NULL, spa, bp, arc_getbuf_func, &abuf,
419 ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL,
420 &aflags, zb) != 0)
421 return (SET_ERROR(EIO));
422
423 err = dump_spill(dsp, zb->zb_object, blksz, abuf->b_data);
424 (void) arc_buf_remove_ref(abuf, &abuf);
425 } else { /* it's a level-0 block of a regular object */
426 uint32_t aflags = ARC_WAIT;
427 arc_buf_t *abuf;
428 int blksz = BP_GET_LSIZE(bp);
429
430 ASSERT0(zb->zb_level);
431 if (arc_read(NULL, spa, bp, arc_getbuf_func, &abuf,
432 ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL,
433 &aflags, zb) != 0) {
434 if (zfs_send_corrupt_data) {
435 /* Send a block filled with 0x"zfs badd bloc" */
436 abuf = arc_buf_alloc(spa, blksz, &abuf,
437 ARC_BUFC_DATA);
438 uint64_t *ptr;
439 for (ptr = abuf->b_data;
440 (char *)ptr < (char *)abuf->b_data + blksz;
441 ptr++)
442 *ptr = 0x2f5baddb10c;
443 } else {
444 return (SET_ERROR(EIO));
445 }
446 }
447
448 err = dump_data(dsp, type, zb->zb_object, zb->zb_blkid * blksz,
449 blksz, bp, abuf->b_data);
450 (void) arc_buf_remove_ref(abuf, &abuf);
451 }
452
453 ASSERT(err == 0 || err == EINTR);
454 return (err);
455 }
456
457 /*
458 * Releases dp using the specified tag.
459 */
460 static int
dmu_send_impl(void * tag,dsl_pool_t * dp,dsl_dataset_t * ds,zfs_bookmark_phys_t * fromzb,boolean_t is_clone,int outfd,vnode_t * vp,offset_t * off)461 dmu_send_impl(void *tag, dsl_pool_t *dp, dsl_dataset_t *ds,
462 #ifdef illumos
463 zfs_bookmark_phys_t *fromzb, boolean_t is_clone, int outfd,
464 vnode_t *vp, offset_t *off)
465 #else
466 zfs_bookmark_phys_t *fromzb, boolean_t is_clone, int outfd,
467 struct file *fp, offset_t *off)
468 #endif
469 {
470 objset_t *os;
471 dmu_replay_record_t *drr;
472 dmu_sendarg_t *dsp;
473 int err;
474 uint64_t fromtxg = 0;
475
476 err = dmu_objset_from_ds(ds, &os);
477 if (err != 0) {
478 dsl_pool_rele(dp, tag);
479 return (err);
480 }
481
482 drr = kmem_zalloc(sizeof (dmu_replay_record_t), KM_SLEEP);
483 drr->drr_type = DRR_BEGIN;
484 drr->drr_u.drr_begin.drr_magic = DMU_BACKUP_MAGIC;
485 DMU_SET_STREAM_HDRTYPE(drr->drr_u.drr_begin.drr_versioninfo,
486 DMU_SUBSTREAM);
487
488 #ifdef _KERNEL
489 if (dmu_objset_type(os) == DMU_OST_ZFS) {
490 uint64_t version;
491 if (zfs_get_zplprop(os, ZFS_PROP_VERSION, &version) != 0) {
492 kmem_free(drr, sizeof (dmu_replay_record_t));
493 dsl_pool_rele(dp, tag);
494 return (SET_ERROR(EINVAL));
495 }
496 if (version >= ZPL_VERSION_SA) {
497 DMU_SET_FEATUREFLAGS(
498 drr->drr_u.drr_begin.drr_versioninfo,
499 DMU_BACKUP_FEATURE_SA_SPILL);
500 }
501 }
502 #endif
503
504 drr->drr_u.drr_begin.drr_creation_time =
505 ds->ds_phys->ds_creation_time;
506 drr->drr_u.drr_begin.drr_type = dmu_objset_type(os);
507 if (is_clone)
508 drr->drr_u.drr_begin.drr_flags |= DRR_FLAG_CLONE;
509 drr->drr_u.drr_begin.drr_toguid = ds->ds_phys->ds_guid;
510 if (ds->ds_phys->ds_flags & DS_FLAG_CI_DATASET)
511 drr->drr_u.drr_begin.drr_flags |= DRR_FLAG_CI_DATA;
512
513 if (fromzb != NULL) {
514 drr->drr_u.drr_begin.drr_fromguid = fromzb->zbm_guid;
515 fromtxg = fromzb->zbm_creation_txg;
516 }
517 dsl_dataset_name(ds, drr->drr_u.drr_begin.drr_toname);
518 if (!dsl_dataset_is_snapshot(ds)) {
519 (void) strlcat(drr->drr_u.drr_begin.drr_toname, "@--head--",
520 sizeof (drr->drr_u.drr_begin.drr_toname));
521 }
522
523 dsp = kmem_zalloc(sizeof (dmu_sendarg_t), KM_SLEEP);
524
525 dsp->dsa_drr = drr;
526 dsp->dsa_outfd = outfd;
527 dsp->dsa_proc = curproc;
528 dsp->dsa_td = curthread;
529 dsp->dsa_fp = fp;
530 dsp->dsa_os = os;
531 dsp->dsa_off = off;
532 dsp->dsa_toguid = ds->ds_phys->ds_guid;
533 ZIO_SET_CHECKSUM(&dsp->dsa_zc, 0, 0, 0, 0);
534 dsp->dsa_pending_op = PENDING_NONE;
535 dsp->dsa_incremental = (fromzb != NULL);
536
537 mutex_enter(&ds->ds_sendstream_lock);
538 list_insert_head(&ds->ds_sendstreams, dsp);
539 mutex_exit(&ds->ds_sendstream_lock);
540
541 dsl_dataset_long_hold(ds, FTAG);
542 dsl_pool_rele(dp, tag);
543
544 if (dump_bytes(dsp, drr, sizeof (dmu_replay_record_t)) != 0) {
545 err = dsp->dsa_err;
546 goto out;
547 }
548
549 err = traverse_dataset(ds, fromtxg, TRAVERSE_PRE | TRAVERSE_PREFETCH,
550 backup_cb, dsp);
551
552 if (dsp->dsa_pending_op != PENDING_NONE)
553 if (dump_bytes(dsp, drr, sizeof (dmu_replay_record_t)) != 0)
554 err = SET_ERROR(EINTR);
555
556 if (err != 0) {
557 if (err == EINTR && dsp->dsa_err != 0)
558 err = dsp->dsa_err;
559 goto out;
560 }
561
562 bzero(drr, sizeof (dmu_replay_record_t));
563 drr->drr_type = DRR_END;
564 drr->drr_u.drr_end.drr_checksum = dsp->dsa_zc;
565 drr->drr_u.drr_end.drr_toguid = dsp->dsa_toguid;
566
567 if (dump_bytes(dsp, drr, sizeof (dmu_replay_record_t)) != 0) {
568 err = dsp->dsa_err;
569 goto out;
570 }
571
572 out:
573 mutex_enter(&ds->ds_sendstream_lock);
574 list_remove(&ds->ds_sendstreams, dsp);
575 mutex_exit(&ds->ds_sendstream_lock);
576
577 kmem_free(drr, sizeof (dmu_replay_record_t));
578 kmem_free(dsp, sizeof (dmu_sendarg_t));
579
580 dsl_dataset_long_rele(ds, FTAG);
581
582 return (err);
583 }
584
585 int
dmu_send_obj(const char * pool,uint64_t tosnap,uint64_t fromsnap,int outfd,vnode_t * vp,offset_t * off)586 dmu_send_obj(const char *pool, uint64_t tosnap, uint64_t fromsnap,
587 #ifdef illumos
588 int outfd, vnode_t *vp, offset_t *off)
589 #else
590 int outfd, struct file *fp, offset_t *off)
591 #endif
592 {
593 dsl_pool_t *dp;
594 dsl_dataset_t *ds;
595 dsl_dataset_t *fromds = NULL;
596 int err;
597
598 err = dsl_pool_hold(pool, FTAG, &dp);
599 if (err != 0)
600 return (err);
601
602 err = dsl_dataset_hold_obj(dp, tosnap, FTAG, &ds);
603 if (err != 0) {
604 dsl_pool_rele(dp, FTAG);
605 return (err);
606 }
607
608 if (fromsnap != 0) {
609 zfs_bookmark_phys_t zb;
610 boolean_t is_clone;
611
612 err = dsl_dataset_hold_obj(dp, fromsnap, FTAG, &fromds);
613 if (err != 0) {
614 dsl_dataset_rele(ds, FTAG);
615 dsl_pool_rele(dp, FTAG);
616 return (err);
617 }
618 if (!dsl_dataset_is_before(ds, fromds, 0))
619 err = SET_ERROR(EXDEV);
620 zb.zbm_creation_time = fromds->ds_phys->ds_creation_time;
621 zb.zbm_creation_txg = fromds->ds_phys->ds_creation_txg;
622 zb.zbm_guid = fromds->ds_phys->ds_guid;
623 is_clone = (fromds->ds_dir != ds->ds_dir);
624 dsl_dataset_rele(fromds, FTAG);
625 err = dmu_send_impl(FTAG, dp, ds, &zb, is_clone,
626 outfd, fp, off);
627 } else {
628 err = dmu_send_impl(FTAG, dp, ds, NULL, B_FALSE,
629 outfd, fp, off);
630 }
631 dsl_dataset_rele(ds, FTAG);
632 return (err);
633 }
634
635 int
dmu_send(const char * tosnap,const char * fromsnap,int outfd,vnode_t * vp,offset_t * off)636 dmu_send(const char *tosnap, const char *fromsnap,
637 #ifdef illumos
638 int outfd, vnode_t *vp, offset_t *off)
639 #else
640 int outfd, struct file *fp, offset_t *off)
641 #endif
642 {
643 dsl_pool_t *dp;
644 dsl_dataset_t *ds;
645 int err;
646 boolean_t owned = B_FALSE;
647
648 if (fromsnap != NULL && strpbrk(fromsnap, "@#") == NULL)
649 return (SET_ERROR(EINVAL));
650
651 err = dsl_pool_hold(tosnap, FTAG, &dp);
652 if (err != 0)
653 return (err);
654
655 if (strchr(tosnap, '@') == NULL && spa_writeable(dp->dp_spa)) {
656 /*
657 * We are sending a filesystem or volume. Ensure
658 * that it doesn't change by owning the dataset.
659 */
660 err = dsl_dataset_own(dp, tosnap, FTAG, &ds);
661 owned = B_TRUE;
662 } else {
663 err = dsl_dataset_hold(dp, tosnap, FTAG, &ds);
664 }
665 if (err != 0) {
666 dsl_pool_rele(dp, FTAG);
667 return (err);
668 }
669
670 if (fromsnap != NULL) {
671 zfs_bookmark_phys_t zb;
672 boolean_t is_clone = B_FALSE;
673 int fsnamelen = strchr(tosnap, '@') - tosnap;
674
675 /*
676 * If the fromsnap is in a different filesystem, then
677 * mark the send stream as a clone.
678 */
679 if (strncmp(tosnap, fromsnap, fsnamelen) != 0 ||
680 (fromsnap[fsnamelen] != '@' &&
681 fromsnap[fsnamelen] != '#')) {
682 is_clone = B_TRUE;
683 }
684
685 if (strchr(fromsnap, '@')) {
686 dsl_dataset_t *fromds;
687 err = dsl_dataset_hold(dp, fromsnap, FTAG, &fromds);
688 if (err == 0) {
689 if (!dsl_dataset_is_before(ds, fromds, 0))
690 err = SET_ERROR(EXDEV);
691 zb.zbm_creation_time =
692 fromds->ds_phys->ds_creation_time;
693 zb.zbm_creation_txg =
694 fromds->ds_phys->ds_creation_txg;
695 zb.zbm_guid = fromds->ds_phys->ds_guid;
696 is_clone = (ds->ds_dir != fromds->ds_dir);
697 dsl_dataset_rele(fromds, FTAG);
698 }
699 } else {
700 err = dsl_bookmark_lookup(dp, fromsnap, ds, &zb);
701 }
702 if (err != 0) {
703 dsl_dataset_rele(ds, FTAG);
704 dsl_pool_rele(dp, FTAG);
705 return (err);
706 }
707 err = dmu_send_impl(FTAG, dp, ds, &zb, is_clone,
708 outfd, fp, off);
709 } else {
710 err = dmu_send_impl(FTAG, dp, ds, NULL, B_FALSE,
711 outfd, fp, off);
712 }
713 if (owned)
714 dsl_dataset_disown(ds, FTAG);
715 else
716 dsl_dataset_rele(ds, FTAG);
717 return (err);
718 }
719
720 int
dmu_send_estimate(dsl_dataset_t * ds,dsl_dataset_t * fromds,uint64_t * sizep)721 dmu_send_estimate(dsl_dataset_t *ds, dsl_dataset_t *fromds, uint64_t *sizep)
722 {
723 dsl_pool_t *dp = ds->ds_dir->dd_pool;
724 int err;
725 uint64_t size;
726
727 ASSERT(dsl_pool_config_held(dp));
728
729 /* tosnap must be a snapshot */
730 if (!dsl_dataset_is_snapshot(ds))
731 return (SET_ERROR(EINVAL));
732
733 /* fromsnap, if provided, must be a snapshot */
734 if (fromds != NULL && !dsl_dataset_is_snapshot(fromds))
735 return (SET_ERROR(EINVAL));
736
737 /*
738 * fromsnap must be an earlier snapshot from the same fs as tosnap,
739 * or the origin's fs.
740 */
741 if (fromds != NULL && !dsl_dataset_is_before(ds, fromds, 0))
742 return (SET_ERROR(EXDEV));
743
744 /* Get uncompressed size estimate of changed data. */
745 if (fromds == NULL) {
746 size = ds->ds_phys->ds_uncompressed_bytes;
747 } else {
748 uint64_t used, comp;
749 err = dsl_dataset_space_written(fromds, ds,
750 &used, &comp, &size);
751 if (err != 0)
752 return (err);
753 }
754
755 /*
756 * Assume that space (both on-disk and in-stream) is dominated by
757 * data. We will adjust for indirect blocks and the copies property,
758 * but ignore per-object space used (eg, dnodes and DRR_OBJECT records).
759 */
760
761 /*
762 * Subtract out approximate space used by indirect blocks.
763 * Assume most space is used by data blocks (non-indirect, non-dnode).
764 * Assume all blocks are recordsize. Assume ditto blocks and
765 * internal fragmentation counter out compression.
766 *
767 * Therefore, space used by indirect blocks is sizeof(blkptr_t) per
768 * block, which we observe in practice.
769 */
770 uint64_t recordsize;
771 err = dsl_prop_get_int_ds(ds, "recordsize", &recordsize);
772 if (err != 0)
773 return (err);
774 size -= size / recordsize * sizeof (blkptr_t);
775
776 /* Add in the space for the record associated with each block. */
777 size += size / recordsize * sizeof (dmu_replay_record_t);
778
779 *sizep = size;
780
781 return (0);
782 }
783
784 typedef struct dmu_recv_begin_arg {
785 const char *drba_origin;
786 dmu_recv_cookie_t *drba_cookie;
787 cred_t *drba_cred;
788 uint64_t drba_snapobj;
789 } dmu_recv_begin_arg_t;
790
791 static int
recv_begin_check_existing_impl(dmu_recv_begin_arg_t * drba,dsl_dataset_t * ds,uint64_t fromguid)792 recv_begin_check_existing_impl(dmu_recv_begin_arg_t *drba, dsl_dataset_t *ds,
793 uint64_t fromguid)
794 {
795 uint64_t val;
796 int error;
797 dsl_pool_t *dp = ds->ds_dir->dd_pool;
798
799 /* temporary clone name must not exist */
800 error = zap_lookup(dp->dp_meta_objset,
801 ds->ds_dir->dd_phys->dd_child_dir_zapobj, recv_clone_name,
802 8, 1, &val);
803 if (error != ENOENT)
804 return (error == 0 ? EBUSY : error);
805
806 /* new snapshot name must not exist */
807 error = zap_lookup(dp->dp_meta_objset,
808 ds->ds_phys->ds_snapnames_zapobj, drba->drba_cookie->drc_tosnap,
809 8, 1, &val);
810 if (error != ENOENT)
811 return (error == 0 ? EEXIST : error);
812
813 /*
814 * Check snapshot limit before receiving. We'll recheck again at the
815 * end, but might as well abort before receiving if we're already over
816 * the limit.
817 *
818 * Note that we do not check the file system limit with
819 * dsl_dir_fscount_check because the temporary %clones don't count
820 * against that limit.
821 */
822 error = dsl_fs_ss_limit_check(ds->ds_dir, 1, ZFS_PROP_SNAPSHOT_LIMIT,
823 NULL, drba->drba_cred);
824 if (error != 0)
825 return (error);
826
827 if (fromguid != 0) {
828 dsl_dataset_t *snap;
829 uint64_t obj = ds->ds_phys->ds_prev_snap_obj;
830
831 /* Find snapshot in this dir that matches fromguid. */
832 while (obj != 0) {
833 error = dsl_dataset_hold_obj(dp, obj, FTAG,
834 &snap);
835 if (error != 0)
836 return (SET_ERROR(ENODEV));
837 if (snap->ds_dir != ds->ds_dir) {
838 dsl_dataset_rele(snap, FTAG);
839 return (SET_ERROR(ENODEV));
840 }
841 if (snap->ds_phys->ds_guid == fromguid)
842 break;
843 obj = snap->ds_phys->ds_prev_snap_obj;
844 dsl_dataset_rele(snap, FTAG);
845 }
846 if (obj == 0)
847 return (SET_ERROR(ENODEV));
848
849 if (drba->drba_cookie->drc_force) {
850 drba->drba_snapobj = obj;
851 } else {
852 /*
853 * If we are not forcing, there must be no
854 * changes since fromsnap.
855 */
856 if (dsl_dataset_modified_since_snap(ds, snap)) {
857 dsl_dataset_rele(snap, FTAG);
858 return (SET_ERROR(ETXTBSY));
859 }
860 drba->drba_snapobj = ds->ds_prev->ds_object;
861 }
862
863 dsl_dataset_rele(snap, FTAG);
864 } else {
865 /* if full, then must be forced */
866 if (!drba->drba_cookie->drc_force)
867 return (SET_ERROR(EEXIST));
868 /* start from $ORIGIN@$ORIGIN, if supported */
869 drba->drba_snapobj = dp->dp_origin_snap != NULL ?
870 dp->dp_origin_snap->ds_object : 0;
871 }
872
873 return (0);
874
875 }
876
877 static int
dmu_recv_begin_check(void * arg,dmu_tx_t * tx)878 dmu_recv_begin_check(void *arg, dmu_tx_t *tx)
879 {
880 dmu_recv_begin_arg_t *drba = arg;
881 dsl_pool_t *dp = dmu_tx_pool(tx);
882 struct drr_begin *drrb = drba->drba_cookie->drc_drrb;
883 uint64_t fromguid = drrb->drr_fromguid;
884 int flags = drrb->drr_flags;
885 int error;
886 dsl_dataset_t *ds;
887 const char *tofs = drba->drba_cookie->drc_tofs;
888
889 /* already checked */
890 ASSERT3U(drrb->drr_magic, ==, DMU_BACKUP_MAGIC);
891
892 if (DMU_GET_STREAM_HDRTYPE(drrb->drr_versioninfo) ==
893 DMU_COMPOUNDSTREAM ||
894 drrb->drr_type >= DMU_OST_NUMTYPES ||
895 ((flags & DRR_FLAG_CLONE) && drba->drba_origin == NULL))
896 return (SET_ERROR(EINVAL));
897
898 /* Verify pool version supports SA if SA_SPILL feature set */
899 if ((DMU_GET_FEATUREFLAGS(drrb->drr_versioninfo) &
900 DMU_BACKUP_FEATURE_SA_SPILL) &&
901 spa_version(dp->dp_spa) < SPA_VERSION_SA) {
902 return (SET_ERROR(ENOTSUP));
903 }
904
905 error = dsl_dataset_hold(dp, tofs, FTAG, &ds);
906 if (error == 0) {
907 /* target fs already exists; recv into temp clone */
908
909 /* Can't recv a clone into an existing fs */
910 if (flags & DRR_FLAG_CLONE) {
911 dsl_dataset_rele(ds, FTAG);
912 return (SET_ERROR(EINVAL));
913 }
914
915 error = recv_begin_check_existing_impl(drba, ds, fromguid);
916 dsl_dataset_rele(ds, FTAG);
917 } else if (error == ENOENT) {
918 /* target fs does not exist; must be a full backup or clone */
919 char buf[MAXNAMELEN];
920
921 /*
922 * If it's a non-clone incremental, we are missing the
923 * target fs, so fail the recv.
924 */
925 if (fromguid != 0 && !(flags & DRR_FLAG_CLONE))
926 return (SET_ERROR(ENOENT));
927
928 /* Open the parent of tofs */
929 ASSERT3U(strlen(tofs), <, MAXNAMELEN);
930 (void) strlcpy(buf, tofs, strrchr(tofs, '/') - tofs + 1);
931 error = dsl_dataset_hold(dp, buf, FTAG, &ds);
932 if (error != 0)
933 return (error);
934
935 /*
936 * Check filesystem and snapshot limits before receiving. We'll
937 * recheck snapshot limits again at the end (we create the
938 * filesystems and increment those counts during begin_sync).
939 */
940 error = dsl_fs_ss_limit_check(ds->ds_dir, 1,
941 ZFS_PROP_FILESYSTEM_LIMIT, NULL, drba->drba_cred);
942 if (error != 0) {
943 dsl_dataset_rele(ds, FTAG);
944 return (error);
945 }
946
947 error = dsl_fs_ss_limit_check(ds->ds_dir, 1,
948 ZFS_PROP_SNAPSHOT_LIMIT, NULL, drba->drba_cred);
949 if (error != 0) {
950 dsl_dataset_rele(ds, FTAG);
951 return (error);
952 }
953
954 if (drba->drba_origin != NULL) {
955 dsl_dataset_t *origin;
956 error = dsl_dataset_hold(dp, drba->drba_origin,
957 FTAG, &origin);
958 if (error != 0) {
959 dsl_dataset_rele(ds, FTAG);
960 return (error);
961 }
962 if (!dsl_dataset_is_snapshot(origin)) {
963 dsl_dataset_rele(origin, FTAG);
964 dsl_dataset_rele(ds, FTAG);
965 return (SET_ERROR(EINVAL));
966 }
967 if (origin->ds_phys->ds_guid != fromguid) {
968 dsl_dataset_rele(origin, FTAG);
969 dsl_dataset_rele(ds, FTAG);
970 return (SET_ERROR(ENODEV));
971 }
972 dsl_dataset_rele(origin, FTAG);
973 }
974 dsl_dataset_rele(ds, FTAG);
975 error = 0;
976 }
977 return (error);
978 }
979
980 static void
dmu_recv_begin_sync(void * arg,dmu_tx_t * tx)981 dmu_recv_begin_sync(void *arg, dmu_tx_t *tx)
982 {
983 dmu_recv_begin_arg_t *drba = arg;
984 dsl_pool_t *dp = dmu_tx_pool(tx);
985 struct drr_begin *drrb = drba->drba_cookie->drc_drrb;
986 const char *tofs = drba->drba_cookie->drc_tofs;
987 dsl_dataset_t *ds, *newds;
988 uint64_t dsobj;
989 int error;
990 uint64_t crflags;
991
992 crflags = (drrb->drr_flags & DRR_FLAG_CI_DATA) ?
993 DS_FLAG_CI_DATASET : 0;
994
995 error = dsl_dataset_hold(dp, tofs, FTAG, &ds);
996 if (error == 0) {
997 /* create temporary clone */
998 dsl_dataset_t *snap = NULL;
999 if (drba->drba_snapobj != 0) {
1000 VERIFY0(dsl_dataset_hold_obj(dp,
1001 drba->drba_snapobj, FTAG, &snap));
1002 }
1003 dsobj = dsl_dataset_create_sync(ds->ds_dir, recv_clone_name,
1004 snap, crflags, drba->drba_cred, tx);
1005 if (drba->drba_snapobj != 0)
1006 dsl_dataset_rele(snap, FTAG);
1007 dsl_dataset_rele(ds, FTAG);
1008 } else {
1009 dsl_dir_t *dd;
1010 const char *tail;
1011 dsl_dataset_t *origin = NULL;
1012
1013 VERIFY0(dsl_dir_hold(dp, tofs, FTAG, &dd, &tail));
1014
1015 if (drba->drba_origin != NULL) {
1016 VERIFY0(dsl_dataset_hold(dp, drba->drba_origin,
1017 FTAG, &origin));
1018 }
1019
1020 /* Create new dataset. */
1021 dsobj = dsl_dataset_create_sync(dd,
1022 strrchr(tofs, '/') + 1,
1023 origin, crflags, drba->drba_cred, tx);
1024 if (origin != NULL)
1025 dsl_dataset_rele(origin, FTAG);
1026 dsl_dir_rele(dd, FTAG);
1027 drba->drba_cookie->drc_newfs = B_TRUE;
1028 }
1029 VERIFY0(dsl_dataset_own_obj(dp, dsobj, dmu_recv_tag, &newds));
1030
1031 dmu_buf_will_dirty(newds->ds_dbuf, tx);
1032 newds->ds_phys->ds_flags |= DS_FLAG_INCONSISTENT;
1033
1034 /*
1035 * If we actually created a non-clone, we need to create the
1036 * objset in our new dataset.
1037 */
1038 if (BP_IS_HOLE(dsl_dataset_get_blkptr(newds))) {
1039 (void) dmu_objset_create_impl(dp->dp_spa,
1040 newds, dsl_dataset_get_blkptr(newds), drrb->drr_type, tx);
1041 }
1042
1043 drba->drba_cookie->drc_ds = newds;
1044
1045 spa_history_log_internal_ds(newds, "receive", tx, "");
1046 }
1047
1048 /*
1049 * NB: callers *MUST* call dmu_recv_stream() if dmu_recv_begin()
1050 * succeeds; otherwise we will leak the holds on the datasets.
1051 */
1052 int
dmu_recv_begin(char * tofs,char * tosnap,struct drr_begin * drrb,boolean_t force,char * origin,dmu_recv_cookie_t * drc)1053 dmu_recv_begin(char *tofs, char *tosnap, struct drr_begin *drrb,
1054 boolean_t force, char *origin, dmu_recv_cookie_t *drc)
1055 {
1056 dmu_recv_begin_arg_t drba = { 0 };
1057 dmu_replay_record_t *drr;
1058
1059 bzero(drc, sizeof (dmu_recv_cookie_t));
1060 drc->drc_drrb = drrb;
1061 drc->drc_tosnap = tosnap;
1062 drc->drc_tofs = tofs;
1063 drc->drc_force = force;
1064 drc->drc_cred = CRED();
1065
1066 if (drrb->drr_magic == BSWAP_64(DMU_BACKUP_MAGIC))
1067 drc->drc_byteswap = B_TRUE;
1068 else if (drrb->drr_magic != DMU_BACKUP_MAGIC)
1069 return (SET_ERROR(EINVAL));
1070
1071 drr = kmem_zalloc(sizeof (dmu_replay_record_t), KM_SLEEP);
1072 drr->drr_type = DRR_BEGIN;
1073 drr->drr_u.drr_begin = *drc->drc_drrb;
1074 if (drc->drc_byteswap) {
1075 fletcher_4_incremental_byteswap(drr,
1076 sizeof (dmu_replay_record_t), &drc->drc_cksum);
1077 } else {
1078 fletcher_4_incremental_native(drr,
1079 sizeof (dmu_replay_record_t), &drc->drc_cksum);
1080 }
1081 kmem_free(drr, sizeof (dmu_replay_record_t));
1082
1083 if (drc->drc_byteswap) {
1084 drrb->drr_magic = BSWAP_64(drrb->drr_magic);
1085 drrb->drr_versioninfo = BSWAP_64(drrb->drr_versioninfo);
1086 drrb->drr_creation_time = BSWAP_64(drrb->drr_creation_time);
1087 drrb->drr_type = BSWAP_32(drrb->drr_type);
1088 drrb->drr_toguid = BSWAP_64(drrb->drr_toguid);
1089 drrb->drr_fromguid = BSWAP_64(drrb->drr_fromguid);
1090 }
1091
1092 drba.drba_origin = origin;
1093 drba.drba_cookie = drc;
1094 drba.drba_cred = CRED();
1095
1096 return (dsl_sync_task(tofs, dmu_recv_begin_check, dmu_recv_begin_sync,
1097 &drba, 5));
1098 }
1099
1100 struct restorearg {
1101 int err;
1102 boolean_t byteswap;
1103 kthread_t *td;
1104 struct file *fp;
1105 char *buf;
1106 uint64_t voff;
1107 int bufsize; /* amount of memory allocated for buf */
1108 zio_cksum_t cksum;
1109 avl_tree_t *guid_to_ds_map;
1110 };
1111
1112 typedef struct guid_map_entry {
1113 uint64_t guid;
1114 dsl_dataset_t *gme_ds;
1115 avl_node_t avlnode;
1116 } guid_map_entry_t;
1117
1118 static int
guid_compare(const void * arg1,const void * arg2)1119 guid_compare(const void *arg1, const void *arg2)
1120 {
1121 const guid_map_entry_t *gmep1 = arg1;
1122 const guid_map_entry_t *gmep2 = arg2;
1123
1124 if (gmep1->guid < gmep2->guid)
1125 return (-1);
1126 else if (gmep1->guid > gmep2->guid)
1127 return (1);
1128 return (0);
1129 }
1130
1131 static void
free_guid_map_onexit(void * arg)1132 free_guid_map_onexit(void *arg)
1133 {
1134 avl_tree_t *ca = arg;
1135 void *cookie = NULL;
1136 guid_map_entry_t *gmep;
1137
1138 while ((gmep = avl_destroy_nodes(ca, &cookie)) != NULL) {
1139 dsl_dataset_long_rele(gmep->gme_ds, gmep);
1140 dsl_dataset_rele(gmep->gme_ds, gmep);
1141 kmem_free(gmep, sizeof (guid_map_entry_t));
1142 }
1143 avl_destroy(ca);
1144 kmem_free(ca, sizeof (avl_tree_t));
1145 }
1146
1147 static int
restore_bytes(struct restorearg * ra,void * buf,int len,off_t off,ssize_t * resid)1148 restore_bytes(struct restorearg *ra, void *buf, int len, off_t off, ssize_t *resid)
1149 {
1150 struct uio auio;
1151 struct iovec aiov;
1152 int error;
1153
1154 aiov.iov_base = buf;
1155 aiov.iov_len = len;
1156 auio.uio_iov = &aiov;
1157 auio.uio_iovcnt = 1;
1158 auio.uio_resid = len;
1159 auio.uio_segflg = UIO_SYSSPACE;
1160 auio.uio_rw = UIO_READ;
1161 auio.uio_offset = off;
1162 auio.uio_td = ra->td;
1163 #ifdef _KERNEL
1164 error = fo_read(ra->fp, &auio, ra->td->td_ucred, FOF_OFFSET, ra->td);
1165 #else
1166 fprintf(stderr, "%s: returning EOPNOTSUPP\n", __func__);
1167 error = EOPNOTSUPP;
1168 #endif
1169 *resid = auio.uio_resid;
1170 return (error);
1171 }
1172
1173 static void *
restore_read(struct restorearg * ra,int len)1174 restore_read(struct restorearg *ra, int len)
1175 {
1176 void *rv;
1177 int done = 0;
1178
1179 /* some things will require 8-byte alignment, so everything must */
1180 ASSERT0(len % 8);
1181
1182 while (done < len) {
1183 ssize_t resid;
1184
1185 ra->err = restore_bytes(ra, (caddr_t)ra->buf + done,
1186 len - done, ra->voff, &resid);
1187
1188 if (resid == len - done)
1189 ra->err = SET_ERROR(EINVAL);
1190 ra->voff += len - done - resid;
1191 done = len - resid;
1192 if (ra->err != 0)
1193 return (NULL);
1194 }
1195
1196 ASSERT3U(done, ==, len);
1197 rv = ra->buf;
1198 if (ra->byteswap)
1199 fletcher_4_incremental_byteswap(rv, len, &ra->cksum);
1200 else
1201 fletcher_4_incremental_native(rv, len, &ra->cksum);
1202 return (rv);
1203 }
1204
1205 static void
backup_byteswap(dmu_replay_record_t * drr)1206 backup_byteswap(dmu_replay_record_t *drr)
1207 {
1208 #define DO64(X) (drr->drr_u.X = BSWAP_64(drr->drr_u.X))
1209 #define DO32(X) (drr->drr_u.X = BSWAP_32(drr->drr_u.X))
1210 drr->drr_type = BSWAP_32(drr->drr_type);
1211 drr->drr_payloadlen = BSWAP_32(drr->drr_payloadlen);
1212 switch (drr->drr_type) {
1213 case DRR_BEGIN:
1214 DO64(drr_begin.drr_magic);
1215 DO64(drr_begin.drr_versioninfo);
1216 DO64(drr_begin.drr_creation_time);
1217 DO32(drr_begin.drr_type);
1218 DO32(drr_begin.drr_flags);
1219 DO64(drr_begin.drr_toguid);
1220 DO64(drr_begin.drr_fromguid);
1221 break;
1222 case DRR_OBJECT:
1223 DO64(drr_object.drr_object);
1224 /* DO64(drr_object.drr_allocation_txg); */
1225 DO32(drr_object.drr_type);
1226 DO32(drr_object.drr_bonustype);
1227 DO32(drr_object.drr_blksz);
1228 DO32(drr_object.drr_bonuslen);
1229 DO64(drr_object.drr_toguid);
1230 break;
1231 case DRR_FREEOBJECTS:
1232 DO64(drr_freeobjects.drr_firstobj);
1233 DO64(drr_freeobjects.drr_numobjs);
1234 DO64(drr_freeobjects.drr_toguid);
1235 break;
1236 case DRR_WRITE:
1237 DO64(drr_write.drr_object);
1238 DO32(drr_write.drr_type);
1239 DO64(drr_write.drr_offset);
1240 DO64(drr_write.drr_length);
1241 DO64(drr_write.drr_toguid);
1242 DO64(drr_write.drr_key.ddk_cksum.zc_word[0]);
1243 DO64(drr_write.drr_key.ddk_cksum.zc_word[1]);
1244 DO64(drr_write.drr_key.ddk_cksum.zc_word[2]);
1245 DO64(drr_write.drr_key.ddk_cksum.zc_word[3]);
1246 DO64(drr_write.drr_key.ddk_prop);
1247 break;
1248 case DRR_WRITE_BYREF:
1249 DO64(drr_write_byref.drr_object);
1250 DO64(drr_write_byref.drr_offset);
1251 DO64(drr_write_byref.drr_length);
1252 DO64(drr_write_byref.drr_toguid);
1253 DO64(drr_write_byref.drr_refguid);
1254 DO64(drr_write_byref.drr_refobject);
1255 DO64(drr_write_byref.drr_refoffset);
1256 DO64(drr_write_byref.drr_key.ddk_cksum.zc_word[0]);
1257 DO64(drr_write_byref.drr_key.ddk_cksum.zc_word[1]);
1258 DO64(drr_write_byref.drr_key.ddk_cksum.zc_word[2]);
1259 DO64(drr_write_byref.drr_key.ddk_cksum.zc_word[3]);
1260 DO64(drr_write_byref.drr_key.ddk_prop);
1261 break;
1262 case DRR_FREE:
1263 DO64(drr_free.drr_object);
1264 DO64(drr_free.drr_offset);
1265 DO64(drr_free.drr_length);
1266 DO64(drr_free.drr_toguid);
1267 break;
1268 case DRR_SPILL:
1269 DO64(drr_spill.drr_object);
1270 DO64(drr_spill.drr_length);
1271 DO64(drr_spill.drr_toguid);
1272 break;
1273 case DRR_END:
1274 DO64(drr_end.drr_checksum.zc_word[0]);
1275 DO64(drr_end.drr_checksum.zc_word[1]);
1276 DO64(drr_end.drr_checksum.zc_word[2]);
1277 DO64(drr_end.drr_checksum.zc_word[3]);
1278 DO64(drr_end.drr_toguid);
1279 break;
1280 }
1281 #undef DO64
1282 #undef DO32
1283 }
1284
1285 static int
restore_object(struct restorearg * ra,objset_t * os,struct drr_object * drro)1286 restore_object(struct restorearg *ra, objset_t *os, struct drr_object *drro)
1287 {
1288 int err;
1289 dmu_tx_t *tx;
1290 void *data = NULL;
1291
1292 if (drro->drr_type == DMU_OT_NONE ||
1293 !DMU_OT_IS_VALID(drro->drr_type) ||
1294 !DMU_OT_IS_VALID(drro->drr_bonustype) ||
1295 drro->drr_checksumtype >= ZIO_CHECKSUM_FUNCTIONS ||
1296 drro->drr_compress >= ZIO_COMPRESS_FUNCTIONS ||
1297 P2PHASE(drro->drr_blksz, SPA_MINBLOCKSIZE) ||
1298 drro->drr_blksz < SPA_MINBLOCKSIZE ||
1299 drro->drr_blksz > SPA_MAXBLOCKSIZE ||
1300 drro->drr_bonuslen > DN_MAX_BONUSLEN) {
1301 return (SET_ERROR(EINVAL));
1302 }
1303
1304 err = dmu_object_info(os, drro->drr_object, NULL);
1305
1306 if (err != 0 && err != ENOENT)
1307 return (SET_ERROR(EINVAL));
1308
1309 if (drro->drr_bonuslen) {
1310 data = restore_read(ra, P2ROUNDUP(drro->drr_bonuslen, 8));
1311 if (ra->err != 0)
1312 return (ra->err);
1313 }
1314
1315 if (err == ENOENT) {
1316 /* currently free, want to be allocated */
1317 tx = dmu_tx_create(os);
1318 dmu_tx_hold_bonus(tx, DMU_NEW_OBJECT);
1319 err = dmu_tx_assign(tx, TXG_WAIT);
1320 if (err != 0) {
1321 dmu_tx_abort(tx);
1322 return (err);
1323 }
1324 err = dmu_object_claim(os, drro->drr_object,
1325 drro->drr_type, drro->drr_blksz,
1326 drro->drr_bonustype, drro->drr_bonuslen, tx);
1327 dmu_tx_commit(tx);
1328 } else {
1329 /* currently allocated, want to be allocated */
1330 err = dmu_object_reclaim(os, drro->drr_object,
1331 drro->drr_type, drro->drr_blksz,
1332 drro->drr_bonustype, drro->drr_bonuslen);
1333 }
1334 if (err != 0) {
1335 return (SET_ERROR(EINVAL));
1336 }
1337
1338 tx = dmu_tx_create(os);
1339 dmu_tx_hold_bonus(tx, drro->drr_object);
1340 err = dmu_tx_assign(tx, TXG_WAIT);
1341 if (err != 0) {
1342 dmu_tx_abort(tx);
1343 return (err);
1344 }
1345
1346 dmu_object_set_checksum(os, drro->drr_object, drro->drr_checksumtype,
1347 tx);
1348 dmu_object_set_compress(os, drro->drr_object, drro->drr_compress, tx);
1349
1350 if (data != NULL) {
1351 dmu_buf_t *db;
1352
1353 VERIFY(0 == dmu_bonus_hold(os, drro->drr_object, FTAG, &db));
1354 dmu_buf_will_dirty(db, tx);
1355
1356 ASSERT3U(db->db_size, >=, drro->drr_bonuslen);
1357 bcopy(data, db->db_data, drro->drr_bonuslen);
1358 if (ra->byteswap) {
1359 dmu_object_byteswap_t byteswap =
1360 DMU_OT_BYTESWAP(drro->drr_bonustype);
1361 dmu_ot_byteswap[byteswap].ob_func(db->db_data,
1362 drro->drr_bonuslen);
1363 }
1364 dmu_buf_rele(db, FTAG);
1365 }
1366 dmu_tx_commit(tx);
1367 return (0);
1368 }
1369
1370 /* ARGSUSED */
1371 static int
restore_freeobjects(struct restorearg * ra,objset_t * os,struct drr_freeobjects * drrfo)1372 restore_freeobjects(struct restorearg *ra, objset_t *os,
1373 struct drr_freeobjects *drrfo)
1374 {
1375 uint64_t obj;
1376
1377 if (drrfo->drr_firstobj + drrfo->drr_numobjs < drrfo->drr_firstobj)
1378 return (SET_ERROR(EINVAL));
1379
1380 for (obj = drrfo->drr_firstobj;
1381 obj < drrfo->drr_firstobj + drrfo->drr_numobjs;
1382 (void) dmu_object_next(os, &obj, FALSE, 0)) {
1383 int err;
1384
1385 if (dmu_object_info(os, obj, NULL) != 0)
1386 continue;
1387
1388 err = dmu_free_long_object(os, obj);
1389 if (err != 0)
1390 return (err);
1391 }
1392 return (0);
1393 }
1394
1395 static int
restore_write(struct restorearg * ra,objset_t * os,struct drr_write * drrw)1396 restore_write(struct restorearg *ra, objset_t *os,
1397 struct drr_write *drrw)
1398 {
1399 dmu_tx_t *tx;
1400 void *data;
1401 int err;
1402
1403 if (drrw->drr_offset + drrw->drr_length < drrw->drr_offset ||
1404 !DMU_OT_IS_VALID(drrw->drr_type))
1405 return (SET_ERROR(EINVAL));
1406
1407 data = restore_read(ra, drrw->drr_length);
1408 if (data == NULL)
1409 return (ra->err);
1410
1411 if (dmu_object_info(os, drrw->drr_object, NULL) != 0)
1412 return (SET_ERROR(EINVAL));
1413
1414 tx = dmu_tx_create(os);
1415
1416 dmu_tx_hold_write(tx, drrw->drr_object,
1417 drrw->drr_offset, drrw->drr_length);
1418 err = dmu_tx_assign(tx, TXG_WAIT);
1419 if (err != 0) {
1420 dmu_tx_abort(tx);
1421 return (err);
1422 }
1423 if (ra->byteswap) {
1424 dmu_object_byteswap_t byteswap =
1425 DMU_OT_BYTESWAP(drrw->drr_type);
1426 dmu_ot_byteswap[byteswap].ob_func(data, drrw->drr_length);
1427 }
1428 dmu_write(os, drrw->drr_object,
1429 drrw->drr_offset, drrw->drr_length, data, tx);
1430 dmu_tx_commit(tx);
1431 return (0);
1432 }
1433
1434 /*
1435 * Handle a DRR_WRITE_BYREF record. This record is used in dedup'ed
1436 * streams to refer to a copy of the data that is already on the
1437 * system because it came in earlier in the stream. This function
1438 * finds the earlier copy of the data, and uses that copy instead of
1439 * data from the stream to fulfill this write.
1440 */
1441 static int
restore_write_byref(struct restorearg * ra,objset_t * os,struct drr_write_byref * drrwbr)1442 restore_write_byref(struct restorearg *ra, objset_t *os,
1443 struct drr_write_byref *drrwbr)
1444 {
1445 dmu_tx_t *tx;
1446 int err;
1447 guid_map_entry_t gmesrch;
1448 guid_map_entry_t *gmep;
1449 avl_index_t where;
1450 objset_t *ref_os = NULL;
1451 dmu_buf_t *dbp;
1452
1453 if (drrwbr->drr_offset + drrwbr->drr_length < drrwbr->drr_offset)
1454 return (SET_ERROR(EINVAL));
1455
1456 /*
1457 * If the GUID of the referenced dataset is different from the
1458 * GUID of the target dataset, find the referenced dataset.
1459 */
1460 if (drrwbr->drr_toguid != drrwbr->drr_refguid) {
1461 gmesrch.guid = drrwbr->drr_refguid;
1462 if ((gmep = avl_find(ra->guid_to_ds_map, &gmesrch,
1463 &where)) == NULL) {
1464 return (SET_ERROR(EINVAL));
1465 }
1466 if (dmu_objset_from_ds(gmep->gme_ds, &ref_os))
1467 return (SET_ERROR(EINVAL));
1468 } else {
1469 ref_os = os;
1470 }
1471
1472 if (err = dmu_buf_hold(ref_os, drrwbr->drr_refobject,
1473 drrwbr->drr_refoffset, FTAG, &dbp, DMU_READ_PREFETCH))
1474 return (err);
1475
1476 tx = dmu_tx_create(os);
1477
1478 dmu_tx_hold_write(tx, drrwbr->drr_object,
1479 drrwbr->drr_offset, drrwbr->drr_length);
1480 err = dmu_tx_assign(tx, TXG_WAIT);
1481 if (err != 0) {
1482 dmu_tx_abort(tx);
1483 return (err);
1484 }
1485 dmu_write(os, drrwbr->drr_object,
1486 drrwbr->drr_offset, drrwbr->drr_length, dbp->db_data, tx);
1487 dmu_buf_rele(dbp, FTAG);
1488 dmu_tx_commit(tx);
1489 return (0);
1490 }
1491
1492 static int
restore_spill(struct restorearg * ra,objset_t * os,struct drr_spill * drrs)1493 restore_spill(struct restorearg *ra, objset_t *os, struct drr_spill *drrs)
1494 {
1495 dmu_tx_t *tx;
1496 void *data;
1497 dmu_buf_t *db, *db_spill;
1498 int err;
1499
1500 if (drrs->drr_length < SPA_MINBLOCKSIZE ||
1501 drrs->drr_length > SPA_MAXBLOCKSIZE)
1502 return (SET_ERROR(EINVAL));
1503
1504 data = restore_read(ra, drrs->drr_length);
1505 if (data == NULL)
1506 return (ra->err);
1507
1508 if (dmu_object_info(os, drrs->drr_object, NULL) != 0)
1509 return (SET_ERROR(EINVAL));
1510
1511 VERIFY(0 == dmu_bonus_hold(os, drrs->drr_object, FTAG, &db));
1512 if ((err = dmu_spill_hold_by_bonus(db, FTAG, &db_spill)) != 0) {
1513 dmu_buf_rele(db, FTAG);
1514 return (err);
1515 }
1516
1517 tx = dmu_tx_create(os);
1518
1519 dmu_tx_hold_spill(tx, db->db_object);
1520
1521 err = dmu_tx_assign(tx, TXG_WAIT);
1522 if (err != 0) {
1523 dmu_buf_rele(db, FTAG);
1524 dmu_buf_rele(db_spill, FTAG);
1525 dmu_tx_abort(tx);
1526 return (err);
1527 }
1528 dmu_buf_will_dirty(db_spill, tx);
1529
1530 if (db_spill->db_size < drrs->drr_length)
1531 VERIFY(0 == dbuf_spill_set_blksz(db_spill,
1532 drrs->drr_length, tx));
1533 bcopy(data, db_spill->db_data, drrs->drr_length);
1534
1535 dmu_buf_rele(db, FTAG);
1536 dmu_buf_rele(db_spill, FTAG);
1537
1538 dmu_tx_commit(tx);
1539 return (0);
1540 }
1541
1542 /* ARGSUSED */
1543 static int
restore_free(struct restorearg * ra,objset_t * os,struct drr_free * drrf)1544 restore_free(struct restorearg *ra, objset_t *os,
1545 struct drr_free *drrf)
1546 {
1547 int err;
1548
1549 if (drrf->drr_length != -1ULL &&
1550 drrf->drr_offset + drrf->drr_length < drrf->drr_offset)
1551 return (SET_ERROR(EINVAL));
1552
1553 if (dmu_object_info(os, drrf->drr_object, NULL) != 0)
1554 return (SET_ERROR(EINVAL));
1555
1556 err = dmu_free_long_range(os, drrf->drr_object,
1557 drrf->drr_offset, drrf->drr_length);
1558 return (err);
1559 }
1560
1561 /* used to destroy the drc_ds on error */
1562 static void
dmu_recv_cleanup_ds(dmu_recv_cookie_t * drc)1563 dmu_recv_cleanup_ds(dmu_recv_cookie_t *drc)
1564 {
1565 char name[MAXNAMELEN];
1566 dsl_dataset_name(drc->drc_ds, name);
1567 dsl_dataset_disown(drc->drc_ds, dmu_recv_tag);
1568 (void) dsl_destroy_head(name);
1569 }
1570
1571 /*
1572 * NB: callers *must* call dmu_recv_end() if this succeeds.
1573 */
1574 int
dmu_recv_stream(dmu_recv_cookie_t * drc,struct file * fp,offset_t * voffp,int cleanup_fd,uint64_t * action_handlep)1575 dmu_recv_stream(dmu_recv_cookie_t *drc, struct file *fp, offset_t *voffp,
1576 int cleanup_fd, uint64_t *action_handlep)
1577 {
1578 struct restorearg ra = { 0 };
1579 dmu_replay_record_t *drr;
1580 objset_t *os;
1581 zio_cksum_t pcksum;
1582 int featureflags;
1583
1584 ra.byteswap = drc->drc_byteswap;
1585 ra.cksum = drc->drc_cksum;
1586 ra.td = curthread;
1587 ra.fp = fp;
1588 ra.voff = *voffp;
1589 ra.bufsize = 1<<20;
1590 ra.buf = kmem_alloc(ra.bufsize, KM_SLEEP);
1591
1592 /* these were verified in dmu_recv_begin */
1593 ASSERT3U(DMU_GET_STREAM_HDRTYPE(drc->drc_drrb->drr_versioninfo), ==,
1594 DMU_SUBSTREAM);
1595 ASSERT3U(drc->drc_drrb->drr_type, <, DMU_OST_NUMTYPES);
1596
1597 /*
1598 * Open the objset we are modifying.
1599 */
1600 VERIFY0(dmu_objset_from_ds(drc->drc_ds, &os));
1601
1602 ASSERT(drc->drc_ds->ds_phys->ds_flags & DS_FLAG_INCONSISTENT);
1603
1604 featureflags = DMU_GET_FEATUREFLAGS(drc->drc_drrb->drr_versioninfo);
1605
1606 /* if this stream is dedup'ed, set up the avl tree for guid mapping */
1607 if (featureflags & DMU_BACKUP_FEATURE_DEDUP) {
1608 minor_t minor;
1609
1610 if (cleanup_fd == -1) {
1611 ra.err = SET_ERROR(EBADF);
1612 goto out;
1613 }
1614 ra.err = zfs_onexit_fd_hold(cleanup_fd, &minor);
1615 if (ra.err != 0) {
1616 cleanup_fd = -1;
1617 goto out;
1618 }
1619
1620 if (*action_handlep == 0) {
1621 ra.guid_to_ds_map =
1622 kmem_alloc(sizeof (avl_tree_t), KM_SLEEP);
1623 avl_create(ra.guid_to_ds_map, guid_compare,
1624 sizeof (guid_map_entry_t),
1625 offsetof(guid_map_entry_t, avlnode));
1626 ra.err = zfs_onexit_add_cb(minor,
1627 free_guid_map_onexit, ra.guid_to_ds_map,
1628 action_handlep);
1629 if (ra.err != 0)
1630 goto out;
1631 } else {
1632 ra.err = zfs_onexit_cb_data(minor, *action_handlep,
1633 (void **)&ra.guid_to_ds_map);
1634 if (ra.err != 0)
1635 goto out;
1636 }
1637
1638 drc->drc_guid_to_ds_map = ra.guid_to_ds_map;
1639 }
1640
1641 /*
1642 * Read records and process them.
1643 */
1644 pcksum = ra.cksum;
1645 while (ra.err == 0 &&
1646 NULL != (drr = restore_read(&ra, sizeof (*drr)))) {
1647 if (issig(JUSTLOOKING) && issig(FORREAL)) {
1648 ra.err = SET_ERROR(EINTR);
1649 goto out;
1650 }
1651
1652 if (ra.byteswap)
1653 backup_byteswap(drr);
1654
1655 switch (drr->drr_type) {
1656 case DRR_OBJECT:
1657 {
1658 /*
1659 * We need to make a copy of the record header,
1660 * because restore_{object,write} may need to
1661 * restore_read(), which will invalidate drr.
1662 */
1663 struct drr_object drro = drr->drr_u.drr_object;
1664 ra.err = restore_object(&ra, os, &drro);
1665 break;
1666 }
1667 case DRR_FREEOBJECTS:
1668 {
1669 struct drr_freeobjects drrfo =
1670 drr->drr_u.drr_freeobjects;
1671 ra.err = restore_freeobjects(&ra, os, &drrfo);
1672 break;
1673 }
1674 case DRR_WRITE:
1675 {
1676 struct drr_write drrw = drr->drr_u.drr_write;
1677 ra.err = restore_write(&ra, os, &drrw);
1678 break;
1679 }
1680 case DRR_WRITE_BYREF:
1681 {
1682 struct drr_write_byref drrwbr =
1683 drr->drr_u.drr_write_byref;
1684 ra.err = restore_write_byref(&ra, os, &drrwbr);
1685 break;
1686 }
1687 case DRR_FREE:
1688 {
1689 struct drr_free drrf = drr->drr_u.drr_free;
1690 ra.err = restore_free(&ra, os, &drrf);
1691 break;
1692 }
1693 case DRR_END:
1694 {
1695 struct drr_end drre = drr->drr_u.drr_end;
1696 /*
1697 * We compare against the *previous* checksum
1698 * value, because the stored checksum is of
1699 * everything before the DRR_END record.
1700 */
1701 if (!ZIO_CHECKSUM_EQUAL(drre.drr_checksum, pcksum))
1702 ra.err = SET_ERROR(ECKSUM);
1703 goto out;
1704 }
1705 case DRR_SPILL:
1706 {
1707 struct drr_spill drrs = drr->drr_u.drr_spill;
1708 ra.err = restore_spill(&ra, os, &drrs);
1709 break;
1710 }
1711 default:
1712 ra.err = SET_ERROR(EINVAL);
1713 goto out;
1714 }
1715 pcksum = ra.cksum;
1716 }
1717 ASSERT(ra.err != 0);
1718
1719 out:
1720 if ((featureflags & DMU_BACKUP_FEATURE_DEDUP) && (cleanup_fd != -1))
1721 zfs_onexit_fd_rele(cleanup_fd);
1722
1723 if (ra.err != 0) {
1724 /*
1725 * destroy what we created, so we don't leave it in the
1726 * inconsistent restoring state.
1727 */
1728 dmu_recv_cleanup_ds(drc);
1729 }
1730
1731 kmem_free(ra.buf, ra.bufsize);
1732 *voffp = ra.voff;
1733 return (ra.err);
1734 }
1735
1736 static int
dmu_recv_end_check(void * arg,dmu_tx_t * tx)1737 dmu_recv_end_check(void *arg, dmu_tx_t *tx)
1738 {
1739 dmu_recv_cookie_t *drc = arg;
1740 dsl_pool_t *dp = dmu_tx_pool(tx);
1741 int error;
1742
1743 ASSERT3P(drc->drc_ds->ds_owner, ==, dmu_recv_tag);
1744
1745 if (!drc->drc_newfs) {
1746 dsl_dataset_t *origin_head;
1747
1748 error = dsl_dataset_hold(dp, drc->drc_tofs, FTAG, &origin_head);
1749 if (error != 0)
1750 return (error);
1751 if (drc->drc_force) {
1752 /*
1753 * We will destroy any snapshots in tofs (i.e. before
1754 * origin_head) that are after the origin (which is
1755 * the snap before drc_ds, because drc_ds can not
1756 * have any snaps of its own).
1757 */
1758 uint64_t obj = origin_head->ds_phys->ds_prev_snap_obj;
1759 while (obj != drc->drc_ds->ds_phys->ds_prev_snap_obj) {
1760 dsl_dataset_t *snap;
1761 error = dsl_dataset_hold_obj(dp, obj, FTAG,
1762 &snap);
1763 if (error != 0)
1764 break;
1765 if (snap->ds_dir != origin_head->ds_dir)
1766 error = SET_ERROR(EINVAL);
1767 if (error == 0) {
1768 error = dsl_destroy_snapshot_check_impl(
1769 snap, B_FALSE);
1770 }
1771 obj = snap->ds_phys->ds_prev_snap_obj;
1772 dsl_dataset_rele(snap, FTAG);
1773 if (error != 0)
1774 break;
1775 }
1776 if (error != 0) {
1777 dsl_dataset_rele(origin_head, FTAG);
1778 return (error);
1779 }
1780 }
1781 error = dsl_dataset_clone_swap_check_impl(drc->drc_ds,
1782 origin_head, drc->drc_force, drc->drc_owner, tx);
1783 if (error != 0) {
1784 dsl_dataset_rele(origin_head, FTAG);
1785 return (error);
1786 }
1787 error = dsl_dataset_snapshot_check_impl(origin_head,
1788 drc->drc_tosnap, tx, B_TRUE, 1, drc->drc_cred);
1789 dsl_dataset_rele(origin_head, FTAG);
1790 if (error != 0)
1791 return (error);
1792
1793 error = dsl_destroy_head_check_impl(drc->drc_ds, 1);
1794 } else {
1795 error = dsl_dataset_snapshot_check_impl(drc->drc_ds,
1796 drc->drc_tosnap, tx, B_TRUE, 1, drc->drc_cred);
1797 }
1798 return (error);
1799 }
1800
1801 static void
dmu_recv_end_sync(void * arg,dmu_tx_t * tx)1802 dmu_recv_end_sync(void *arg, dmu_tx_t *tx)
1803 {
1804 dmu_recv_cookie_t *drc = arg;
1805 dsl_pool_t *dp = dmu_tx_pool(tx);
1806
1807 spa_history_log_internal_ds(drc->drc_ds, "finish receiving",
1808 tx, "snap=%s", drc->drc_tosnap);
1809
1810 if (!drc->drc_newfs) {
1811 dsl_dataset_t *origin_head;
1812
1813 VERIFY0(dsl_dataset_hold(dp, drc->drc_tofs, FTAG,
1814 &origin_head));
1815
1816 if (drc->drc_force) {
1817 /*
1818 * Destroy any snapshots of drc_tofs (origin_head)
1819 * after the origin (the snap before drc_ds).
1820 */
1821 uint64_t obj = origin_head->ds_phys->ds_prev_snap_obj;
1822 while (obj != drc->drc_ds->ds_phys->ds_prev_snap_obj) {
1823 dsl_dataset_t *snap;
1824 VERIFY0(dsl_dataset_hold_obj(dp, obj, FTAG,
1825 &snap));
1826 ASSERT3P(snap->ds_dir, ==, origin_head->ds_dir);
1827 obj = snap->ds_phys->ds_prev_snap_obj;
1828 dsl_destroy_snapshot_sync_impl(snap,
1829 B_FALSE, tx);
1830 dsl_dataset_rele(snap, FTAG);
1831 }
1832 }
1833 VERIFY3P(drc->drc_ds->ds_prev, ==,
1834 origin_head->ds_prev);
1835
1836 dsl_dataset_clone_swap_sync_impl(drc->drc_ds,
1837 origin_head, tx);
1838 dsl_dataset_snapshot_sync_impl(origin_head,
1839 drc->drc_tosnap, tx);
1840
1841 /* set snapshot's creation time and guid */
1842 dmu_buf_will_dirty(origin_head->ds_prev->ds_dbuf, tx);
1843 origin_head->ds_prev->ds_phys->ds_creation_time =
1844 drc->drc_drrb->drr_creation_time;
1845 origin_head->ds_prev->ds_phys->ds_guid =
1846 drc->drc_drrb->drr_toguid;
1847 origin_head->ds_prev->ds_phys->ds_flags &=
1848 ~DS_FLAG_INCONSISTENT;
1849
1850 dmu_buf_will_dirty(origin_head->ds_dbuf, tx);
1851 origin_head->ds_phys->ds_flags &= ~DS_FLAG_INCONSISTENT;
1852
1853 dsl_dataset_rele(origin_head, FTAG);
1854 dsl_destroy_head_sync_impl(drc->drc_ds, tx);
1855
1856 if (drc->drc_owner != NULL)
1857 VERIFY3P(origin_head->ds_owner, ==, drc->drc_owner);
1858 } else {
1859 dsl_dataset_t *ds = drc->drc_ds;
1860
1861 dsl_dataset_snapshot_sync_impl(ds, drc->drc_tosnap, tx);
1862
1863 /* set snapshot's creation time and guid */
1864 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx);
1865 ds->ds_prev->ds_phys->ds_creation_time =
1866 drc->drc_drrb->drr_creation_time;
1867 ds->ds_prev->ds_phys->ds_guid = drc->drc_drrb->drr_toguid;
1868 ds->ds_prev->ds_phys->ds_flags &= ~DS_FLAG_INCONSISTENT;
1869
1870 dmu_buf_will_dirty(ds->ds_dbuf, tx);
1871 ds->ds_phys->ds_flags &= ~DS_FLAG_INCONSISTENT;
1872 }
1873 drc->drc_newsnapobj = drc->drc_ds->ds_phys->ds_prev_snap_obj;
1874 /*
1875 * Release the hold from dmu_recv_begin. This must be done before
1876 * we return to open context, so that when we free the dataset's dnode,
1877 * we can evict its bonus buffer.
1878 */
1879 dsl_dataset_disown(drc->drc_ds, dmu_recv_tag);
1880 drc->drc_ds = NULL;
1881 }
1882
1883 static int
add_ds_to_guidmap(const char * name,avl_tree_t * guid_map,uint64_t snapobj)1884 add_ds_to_guidmap(const char *name, avl_tree_t *guid_map, uint64_t snapobj)
1885 {
1886 dsl_pool_t *dp;
1887 dsl_dataset_t *snapds;
1888 guid_map_entry_t *gmep;
1889 int err;
1890
1891 ASSERT(guid_map != NULL);
1892
1893 err = dsl_pool_hold(name, FTAG, &dp);
1894 if (err != 0)
1895 return (err);
1896 gmep = kmem_alloc(sizeof (*gmep), KM_SLEEP);
1897 err = dsl_dataset_hold_obj(dp, snapobj, gmep, &snapds);
1898 if (err == 0) {
1899 gmep->guid = snapds->ds_phys->ds_guid;
1900 gmep->gme_ds = snapds;
1901 avl_add(guid_map, gmep);
1902 dsl_dataset_long_hold(snapds, gmep);
1903 } else
1904 kmem_free(gmep, sizeof (*gmep));
1905
1906 dsl_pool_rele(dp, FTAG);
1907 return (err);
1908 }
1909
1910 static int dmu_recv_end_modified_blocks = 3;
1911
1912 static int
dmu_recv_existing_end(dmu_recv_cookie_t * drc)1913 dmu_recv_existing_end(dmu_recv_cookie_t *drc)
1914 {
1915 int error;
1916 char name[MAXNAMELEN];
1917
1918 #ifdef _KERNEL
1919 /*
1920 * We will be destroying the ds; make sure its origin is unmounted if
1921 * necessary.
1922 */
1923 dsl_dataset_name(drc->drc_ds, name);
1924 zfs_destroy_unmount_origin(name);
1925 #endif
1926
1927 error = dsl_sync_task(drc->drc_tofs,
1928 dmu_recv_end_check, dmu_recv_end_sync, drc,
1929 dmu_recv_end_modified_blocks);
1930
1931 if (error != 0)
1932 dmu_recv_cleanup_ds(drc);
1933 return (error);
1934 }
1935
1936 static int
dmu_recv_new_end(dmu_recv_cookie_t * drc)1937 dmu_recv_new_end(dmu_recv_cookie_t *drc)
1938 {
1939 int error;
1940
1941 error = dsl_sync_task(drc->drc_tofs,
1942 dmu_recv_end_check, dmu_recv_end_sync, drc,
1943 dmu_recv_end_modified_blocks);
1944
1945 if (error != 0) {
1946 dmu_recv_cleanup_ds(drc);
1947 } else if (drc->drc_guid_to_ds_map != NULL) {
1948 (void) add_ds_to_guidmap(drc->drc_tofs,
1949 drc->drc_guid_to_ds_map,
1950 drc->drc_newsnapobj);
1951 }
1952 return (error);
1953 }
1954
1955 int
dmu_recv_end(dmu_recv_cookie_t * drc,void * owner)1956 dmu_recv_end(dmu_recv_cookie_t *drc, void *owner)
1957 {
1958 drc->drc_owner = owner;
1959
1960 if (drc->drc_newfs)
1961 return (dmu_recv_new_end(drc));
1962 else
1963 return (dmu_recv_existing_end(drc));
1964 }
1965
1966 /*
1967 * Return TRUE if this objset is currently being received into.
1968 */
1969 boolean_t
dmu_objset_is_receiving(objset_t * os)1970 dmu_objset_is_receiving(objset_t *os)
1971 {
1972 return (os->os_dsl_dataset != NULL &&
1973 os->os_dsl_dataset->ds_owner == dmu_recv_tag);
1974 }
1975