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3498 panic in arc_read(): !refcount_is_zero(&pbuf->b_hdr->b_refcnt)
[unleashed.git] / usr / src / uts / common / fs / zfs / dmu_send.c
blobc2493357d6d73ba85c1e658d5b807cadb703ef4c
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) 2012 by Delphix. All rights reserved.
25 * Copyright (c) 2012, Joyent, Inc. All rights reserved.
26 */
27
28 #include <sys/dmu.h>
29 #include <sys/dmu_impl.h>
30 #include <sys/dmu_tx.h>
31 #include <sys/dbuf.h>
32 #include <sys/dnode.h>
33 #include <sys/zfs_context.h>
34 #include <sys/dmu_objset.h>
35 #include <sys/dmu_traverse.h>
36 #include <sys/dsl_dataset.h>
37 #include <sys/dsl_dir.h>
38 #include <sys/dsl_prop.h>
39 #include <sys/dsl_pool.h>
40 #include <sys/dsl_synctask.h>
41 #include <sys/zfs_ioctl.h>
42 #include <sys/zap.h>
43 #include <sys/zio_checksum.h>
44 #include <sys/zfs_znode.h>
45 #include <zfs_fletcher.h>
46 #include <sys/avl.h>
47 #include <sys/ddt.h>
48 #include <sys/zfs_onexit.h>
49
50 /* Set this tunable to TRUE to replace corrupt data with 0x2f5baddb10c */
51 int zfs_send_corrupt_data = B_FALSE;
52
53 static char *dmu_recv_tag = "dmu_recv_tag";
54
55 static int
56 dump_bytes(dmu_sendarg_t *dsp, void *buf, int len)
57 {
58 dsl_dataset_t *ds = dsp->dsa_os->os_dsl_dataset;
59 ssize_t resid; /* have to get resid to get detailed errno */
60 ASSERT0(len % 8);
61
62 fletcher_4_incremental_native(buf, len, &dsp->dsa_zc);
63 dsp->dsa_err = vn_rdwr(UIO_WRITE, dsp->dsa_vp,
64 (caddr_t)buf, len,
65 0, UIO_SYSSPACE, FAPPEND, RLIM64_INFINITY, CRED(), &resid);
66
67 mutex_enter(&ds->ds_sendstream_lock);
68 *dsp->dsa_off += len;
69 mutex_exit(&ds->ds_sendstream_lock);
70
71 return (dsp->dsa_err);
72 }
73
74 static int
75 dump_free(dmu_sendarg_t *dsp, uint64_t object, uint64_t offset,
76 uint64_t length)
77 {
78 struct drr_free *drrf = &(dsp->dsa_drr->drr_u.drr_free);
79
80 if (length != -1ULL && offset + length < offset)
81 length = -1ULL;
82
83 /*
84 * If there is a pending op, but it's not PENDING_FREE, push it out,
85 * since free block aggregation can only be done for blocks of the
86 * same type (i.e., DRR_FREE records can only be aggregated with
87 * other DRR_FREE records. DRR_FREEOBJECTS records can only be
88 * aggregated with other DRR_FREEOBJECTS records.
89 */
90 if (dsp->dsa_pending_op != PENDING_NONE &&
91 dsp->dsa_pending_op != PENDING_FREE) {
92 if (dump_bytes(dsp, dsp->dsa_drr,
93 sizeof (dmu_replay_record_t)) != 0)
94 return (EINTR);
95 dsp->dsa_pending_op = PENDING_NONE;
96 }
97
98 if (dsp->dsa_pending_op == PENDING_FREE) {
99 /*
100 * There should never be a PENDING_FREE if length is -1
101 * (because dump_dnode is the only place where this
102 * function is called with a -1, and only after flushing
103 * any pending record).
104 */
105 ASSERT(length != -1ULL);
106 /*
107 * Check to see whether this free block can be aggregated
108 * with pending one.
109 */
110 if (drrf->drr_object == object && drrf->drr_offset +
111 drrf->drr_length == offset) {
112 drrf->drr_length += length;
113 return (0);
114 } else {
115 /* not a continuation. Push out pending record */
116 if (dump_bytes(dsp, dsp->dsa_drr,
117 sizeof (dmu_replay_record_t)) != 0)
118 return (EINTR);
119 dsp->dsa_pending_op = PENDING_NONE;
120 }
121 }
122 /* create a FREE record and make it pending */
123 bzero(dsp->dsa_drr, sizeof (dmu_replay_record_t));
124 dsp->dsa_drr->drr_type = DRR_FREE;
125 drrf->drr_object = object;
126 drrf->drr_offset = offset;
127 drrf->drr_length = length;
128 drrf->drr_toguid = dsp->dsa_toguid;
129 if (length == -1ULL) {
130 if (dump_bytes(dsp, dsp->dsa_drr,
131 sizeof (dmu_replay_record_t)) != 0)
132 return (EINTR);
133 } else {
134 dsp->dsa_pending_op = PENDING_FREE;
135 }
136
137 return (0);
138 }
139
140 static int
141 dump_data(dmu_sendarg_t *dsp, dmu_object_type_t type,
142 uint64_t object, uint64_t offset, int blksz, const blkptr_t *bp, void *data)
143 {
144 struct drr_write *drrw = &(dsp->dsa_drr->drr_u.drr_write);
145
146
147 /*
148 * If there is any kind of pending aggregation (currently either
149 * a grouping of free objects or free blocks), push it out to
150 * the stream, since aggregation can't be done across operations
151 * of different types.
152 */
153 if (dsp->dsa_pending_op != PENDING_NONE) {
154 if (dump_bytes(dsp, dsp->dsa_drr,
155 sizeof (dmu_replay_record_t)) != 0)
156 return (EINTR);
157 dsp->dsa_pending_op = PENDING_NONE;
158 }
159 /* write a DATA record */
160 bzero(dsp->dsa_drr, sizeof (dmu_replay_record_t));
161 dsp->dsa_drr->drr_type = DRR_WRITE;
162 drrw->drr_object = object;
163 drrw->drr_type = type;
164 drrw->drr_offset = offset;
165 drrw->drr_length = blksz;
166 drrw->drr_toguid = dsp->dsa_toguid;
167 drrw->drr_checksumtype = BP_GET_CHECKSUM(bp);
168 if (zio_checksum_table[drrw->drr_checksumtype].ci_dedup)
169 drrw->drr_checksumflags |= DRR_CHECKSUM_DEDUP;
170 DDK_SET_LSIZE(&drrw->drr_key, BP_GET_LSIZE(bp));
171 DDK_SET_PSIZE(&drrw->drr_key, BP_GET_PSIZE(bp));
172 DDK_SET_COMPRESS(&drrw->drr_key, BP_GET_COMPRESS(bp));
173 drrw->drr_key.ddk_cksum = bp->blk_cksum;
174
175 if (dump_bytes(dsp, dsp->dsa_drr, sizeof (dmu_replay_record_t)) != 0)
176 return (EINTR);
177 if (dump_bytes(dsp, data, blksz) != 0)
178 return (EINTR);
179 return (0);
180 }
181
182 static int
183 dump_spill(dmu_sendarg_t *dsp, uint64_t object, int blksz, void *data)
184 {
185 struct drr_spill *drrs = &(dsp->dsa_drr->drr_u.drr_spill);
186
187 if (dsp->dsa_pending_op != PENDING_NONE) {
188 if (dump_bytes(dsp, dsp->dsa_drr,
189 sizeof (dmu_replay_record_t)) != 0)
190 return (EINTR);
191 dsp->dsa_pending_op = PENDING_NONE;
192 }
193
194 /* write a SPILL record */
195 bzero(dsp->dsa_drr, sizeof (dmu_replay_record_t));
196 dsp->dsa_drr->drr_type = DRR_SPILL;
197 drrs->drr_object = object;
198 drrs->drr_length = blksz;
199 drrs->drr_toguid = dsp->dsa_toguid;
200
201 if (dump_bytes(dsp, dsp->dsa_drr, sizeof (dmu_replay_record_t)))
202 return (EINTR);
203 if (dump_bytes(dsp, data, blksz))
204 return (EINTR);
205 return (0);
206 }
207
208 static int
209 dump_freeobjects(dmu_sendarg_t *dsp, uint64_t firstobj, uint64_t numobjs)
210 {
211 struct drr_freeobjects *drrfo = &(dsp->dsa_drr->drr_u.drr_freeobjects);
212
213 /*
214 * If there is a pending op, but it's not PENDING_FREEOBJECTS,
215 * push it out, since free block aggregation can only be done for
216 * blocks of the same type (i.e., DRR_FREE records can only be
217 * aggregated with other DRR_FREE records. DRR_FREEOBJECTS records
218 * can only be aggregated with other DRR_FREEOBJECTS records.
219 */
220 if (dsp->dsa_pending_op != PENDING_NONE &&
221 dsp->dsa_pending_op != PENDING_FREEOBJECTS) {
222 if (dump_bytes(dsp, dsp->dsa_drr,
223 sizeof (dmu_replay_record_t)) != 0)
224 return (EINTR);
225 dsp->dsa_pending_op = PENDING_NONE;
226 }
227 if (dsp->dsa_pending_op == PENDING_FREEOBJECTS) {
228 /*
229 * See whether this free object array can be aggregated
230 * with pending one
231 */
232 if (drrfo->drr_firstobj + drrfo->drr_numobjs == firstobj) {
233 drrfo->drr_numobjs += numobjs;
234 return (0);
235 } else {
236 /* can't be aggregated. Push out pending record */
237 if (dump_bytes(dsp, dsp->dsa_drr,
238 sizeof (dmu_replay_record_t)) != 0)
239 return (EINTR);
240 dsp->dsa_pending_op = PENDING_NONE;
241 }
242 }
243
244 /* write a FREEOBJECTS record */
245 bzero(dsp->dsa_drr, sizeof (dmu_replay_record_t));
246 dsp->dsa_drr->drr_type = DRR_FREEOBJECTS;
247 drrfo->drr_firstobj = firstobj;
248 drrfo->drr_numobjs = numobjs;
249 drrfo->drr_toguid = dsp->dsa_toguid;
250
251 dsp->dsa_pending_op = PENDING_FREEOBJECTS;
252
253 return (0);
254 }
255
256 static int
257 dump_dnode(dmu_sendarg_t *dsp, uint64_t object, dnode_phys_t *dnp)
258 {
259 struct drr_object *drro = &(dsp->dsa_drr->drr_u.drr_object);
260
261 if (dnp == NULL || dnp->dn_type == DMU_OT_NONE)
262 return (dump_freeobjects(dsp, object, 1));
263
264 if (dsp->dsa_pending_op != PENDING_NONE) {
265 if (dump_bytes(dsp, dsp->dsa_drr,
266 sizeof (dmu_replay_record_t)) != 0)
267 return (EINTR);
268 dsp->dsa_pending_op = PENDING_NONE;
269 }
270
271 /* write an OBJECT record */
272 bzero(dsp->dsa_drr, sizeof (dmu_replay_record_t));
273 dsp->dsa_drr->drr_type = DRR_OBJECT;
274 drro->drr_object = object;
275 drro->drr_type = dnp->dn_type;
276 drro->drr_bonustype = dnp->dn_bonustype;
277 drro->drr_blksz = dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT;
278 drro->drr_bonuslen = dnp->dn_bonuslen;
279 drro->drr_checksumtype = dnp->dn_checksum;
280 drro->drr_compress = dnp->dn_compress;
281 drro->drr_toguid = dsp->dsa_toguid;
282
283 if (dump_bytes(dsp, dsp->dsa_drr, sizeof (dmu_replay_record_t)) != 0)
284 return (EINTR);
285
286 if (dump_bytes(dsp, DN_BONUS(dnp), P2ROUNDUP(dnp->dn_bonuslen, 8)) != 0)
287 return (EINTR);
288
289 /* free anything past the end of the file */
290 if (dump_free(dsp, object, (dnp->dn_maxblkid + 1) *
291 (dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT), -1ULL))
292 return (EINTR);
293 if (dsp->dsa_err)
294 return (EINTR);
295 return (0);
296 }
297
298 #define BP_SPAN(dnp, level) \
299 (((uint64_t)dnp->dn_datablkszsec) << (SPA_MINBLOCKSHIFT + \
300 (level) * (dnp->dn_indblkshift - SPA_BLKPTRSHIFT)))
301
302 /* ARGSUSED */
303 static int
304 backup_cb(spa_t *spa, zilog_t *zilog, const blkptr_t *bp,
305 const zbookmark_t *zb, const dnode_phys_t *dnp, void *arg)
306 {
307 dmu_sendarg_t *dsp = arg;
308 dmu_object_type_t type = bp ? BP_GET_TYPE(bp) : DMU_OT_NONE;
309 int err = 0;
310
311 if (issig(JUSTLOOKING) && issig(FORREAL))
312 return (EINTR);
313
314 if (zb->zb_object != DMU_META_DNODE_OBJECT &&
315 DMU_OBJECT_IS_SPECIAL(zb->zb_object)) {
316 return (0);
317 } else if (bp == NULL && zb->zb_object == DMU_META_DNODE_OBJECT) {
318 uint64_t span = BP_SPAN(dnp, zb->zb_level);
319 uint64_t dnobj = (zb->zb_blkid * span) >> DNODE_SHIFT;
320 err = dump_freeobjects(dsp, dnobj, span >> DNODE_SHIFT);
321 } else if (bp == NULL) {
322 uint64_t span = BP_SPAN(dnp, zb->zb_level);
323 err = dump_free(dsp, zb->zb_object, zb->zb_blkid * span, span);
324 } else if (zb->zb_level > 0 || type == DMU_OT_OBJSET) {
325 return (0);
326 } else if (type == DMU_OT_DNODE) {
327 dnode_phys_t *blk;
328 int i;
329 int blksz = BP_GET_LSIZE(bp);
330 uint32_t aflags = ARC_WAIT;
331 arc_buf_t *abuf;
332
333 if (arc_read(NULL, spa, bp, arc_getbuf_func, &abuf,
334 ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL,
335 &aflags, zb) != 0)
336 return (EIO);
337
338 blk = abuf->b_data;
339 for (i = 0; i < blksz >> DNODE_SHIFT; i++) {
340 uint64_t dnobj = (zb->zb_blkid <<
341 (DNODE_BLOCK_SHIFT - DNODE_SHIFT)) + i;
342 err = dump_dnode(dsp, dnobj, blk+i);
343 if (err)
344 break;
345 }
346 (void) arc_buf_remove_ref(abuf, &abuf);
347 } else if (type == DMU_OT_SA) {
348 uint32_t aflags = ARC_WAIT;
349 arc_buf_t *abuf;
350 int blksz = BP_GET_LSIZE(bp);
351
352 if (arc_read(NULL, spa, bp, arc_getbuf_func, &abuf,
353 ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL,
354 &aflags, zb) != 0)
355 return (EIO);
356
357 err = dump_spill(dsp, zb->zb_object, blksz, abuf->b_data);
358 (void) arc_buf_remove_ref(abuf, &abuf);
359 } else { /* it's a level-0 block of a regular object */
360 uint32_t aflags = ARC_WAIT;
361 arc_buf_t *abuf;
362 int blksz = BP_GET_LSIZE(bp);
363
364 if (arc_read(NULL, spa, bp, arc_getbuf_func, &abuf,
365 ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL,
366 &aflags, zb) != 0) {
367 if (zfs_send_corrupt_data) {
368 /* Send a block filled with 0x"zfs badd bloc" */
369 abuf = arc_buf_alloc(spa, blksz, &abuf,
370 ARC_BUFC_DATA);
371 uint64_t *ptr;
372 for (ptr = abuf->b_data;
373 (char *)ptr < (char *)abuf->b_data + blksz;
374 ptr++)
375 *ptr = 0x2f5baddb10c;
376 } else {
377 return (EIO);
378 }
379 }
380
381 err = dump_data(dsp, type, zb->zb_object, zb->zb_blkid * blksz,
382 blksz, bp, abuf->b_data);
383 (void) arc_buf_remove_ref(abuf, &abuf);
384 }
385
386 ASSERT(err == 0 || err == EINTR);
387 return (err);
388 }
389
390 /*
391 * Return TRUE if 'earlier' is an earlier snapshot in 'later's timeline.
392 * For example, they could both be snapshots of the same filesystem, and
393 * 'earlier' is before 'later'. Or 'earlier' could be the origin of
394 * 'later's filesystem. Or 'earlier' could be an older snapshot in the origin's
395 * filesystem. Or 'earlier' could be the origin's origin.
396 */
397 static boolean_t
398 is_before(dsl_dataset_t *later, dsl_dataset_t *earlier)
399 {
400 dsl_pool_t *dp = later->ds_dir->dd_pool;
401 int error;
402 boolean_t ret;
403 dsl_dataset_t *origin;
404
405 if (earlier->ds_phys->ds_creation_txg >=
406 later->ds_phys->ds_creation_txg)
407 return (B_FALSE);
408
409 if (later->ds_dir == earlier->ds_dir)
410 return (B_TRUE);
411 if (!dsl_dir_is_clone(later->ds_dir))
412 return (B_FALSE);
413
414 rw_enter(&dp->dp_config_rwlock, RW_READER);
415 if (later->ds_dir->dd_phys->dd_origin_obj == earlier->ds_object) {
416 rw_exit(&dp->dp_config_rwlock);
417 return (B_TRUE);
418 }
419 error = dsl_dataset_hold_obj(dp,
420 later->ds_dir->dd_phys->dd_origin_obj, FTAG, &origin);
421 rw_exit(&dp->dp_config_rwlock);
422 if (error != 0)
423 return (B_FALSE);
424 ret = is_before(origin, earlier);
425 dsl_dataset_rele(origin, FTAG);
426 return (ret);
427 }
428
429 int
430 dmu_send(objset_t *tosnap, objset_t *fromsnap, int outfd, vnode_t *vp,
431 offset_t *off)
432 {
433 dsl_dataset_t *ds = tosnap->os_dsl_dataset;
434 dsl_dataset_t *fromds = fromsnap ? fromsnap->os_dsl_dataset : NULL;
435 dmu_replay_record_t *drr;
436 dmu_sendarg_t *dsp;
437 int err;
438 uint64_t fromtxg = 0;
439
440 /* tosnap must be a snapshot */
441 if (ds->ds_phys->ds_next_snap_obj == 0)
442 return (EINVAL);
443
444 /*
445 * fromsnap must be an earlier snapshot from the same fs as tosnap,
446 * or the origin's fs.
447 */
448 if (fromds != NULL && !is_before(ds, fromds))
449 return (EXDEV);
450
451 drr = kmem_zalloc(sizeof (dmu_replay_record_t), KM_SLEEP);
452 drr->drr_type = DRR_BEGIN;
453 drr->drr_u.drr_begin.drr_magic = DMU_BACKUP_MAGIC;
454 DMU_SET_STREAM_HDRTYPE(drr->drr_u.drr_begin.drr_versioninfo,
455 DMU_SUBSTREAM);
456
457 #ifdef _KERNEL
458 if (dmu_objset_type(tosnap) == DMU_OST_ZFS) {
459 uint64_t version;
460 if (zfs_get_zplprop(tosnap, ZFS_PROP_VERSION, &version) != 0) {
461 kmem_free(drr, sizeof (dmu_replay_record_t));
462 return (EINVAL);
463 }
464 if (version == ZPL_VERSION_SA) {
465 DMU_SET_FEATUREFLAGS(
466 drr->drr_u.drr_begin.drr_versioninfo,
467 DMU_BACKUP_FEATURE_SA_SPILL);
468 }
469 }
470 #endif
471
472 drr->drr_u.drr_begin.drr_creation_time =
473 ds->ds_phys->ds_creation_time;
474 drr->drr_u.drr_begin.drr_type = tosnap->os_phys->os_type;
475 if (fromds != NULL && ds->ds_dir != fromds->ds_dir)
476 drr->drr_u.drr_begin.drr_flags |= DRR_FLAG_CLONE;
477 drr->drr_u.drr_begin.drr_toguid = ds->ds_phys->ds_guid;
478 if (ds->ds_phys->ds_flags & DS_FLAG_CI_DATASET)
479 drr->drr_u.drr_begin.drr_flags |= DRR_FLAG_CI_DATA;
480
481 if (fromds)
482 drr->drr_u.drr_begin.drr_fromguid = fromds->ds_phys->ds_guid;
483 dsl_dataset_name(ds, drr->drr_u.drr_begin.drr_toname);
484
485 if (fromds)
486 fromtxg = fromds->ds_phys->ds_creation_txg;
487
488 dsp = kmem_zalloc(sizeof (dmu_sendarg_t), KM_SLEEP);
489
490 dsp->dsa_drr = drr;
491 dsp->dsa_vp = vp;
492 dsp->dsa_outfd = outfd;
493 dsp->dsa_proc = curproc;
494 dsp->dsa_os = tosnap;
495 dsp->dsa_off = off;
496 dsp->dsa_toguid = ds->ds_phys->ds_guid;
497 ZIO_SET_CHECKSUM(&dsp->dsa_zc, 0, 0, 0, 0);
498 dsp->dsa_pending_op = PENDING_NONE;
499
500 mutex_enter(&ds->ds_sendstream_lock);
501 list_insert_head(&ds->ds_sendstreams, dsp);
502 mutex_exit(&ds->ds_sendstream_lock);
503
504 if (dump_bytes(dsp, drr, sizeof (dmu_replay_record_t)) != 0) {
505 err = dsp->dsa_err;
506 goto out;
507 }
508
509 err = traverse_dataset(ds, fromtxg, TRAVERSE_PRE | TRAVERSE_PREFETCH,
510 backup_cb, dsp);
511
512 if (dsp->dsa_pending_op != PENDING_NONE)
513 if (dump_bytes(dsp, drr, sizeof (dmu_replay_record_t)) != 0)
514 err = EINTR;
515
516 if (err) {
517 if (err == EINTR && dsp->dsa_err)
518 err = dsp->dsa_err;
519 goto out;
520 }
521
522 bzero(drr, sizeof (dmu_replay_record_t));
523 drr->drr_type = DRR_END;
524 drr->drr_u.drr_end.drr_checksum = dsp->dsa_zc;
525 drr->drr_u.drr_end.drr_toguid = dsp->dsa_toguid;
526
527 if (dump_bytes(dsp, drr, sizeof (dmu_replay_record_t)) != 0) {
528 err = dsp->dsa_err;
529 goto out;
530 }
531
532 out:
533 mutex_enter(&ds->ds_sendstream_lock);
534 list_remove(&ds->ds_sendstreams, dsp);
535 mutex_exit(&ds->ds_sendstream_lock);
536
537 kmem_free(drr, sizeof (dmu_replay_record_t));
538 kmem_free(dsp, sizeof (dmu_sendarg_t));
539
540 return (err);
541 }
542
543 int
544 dmu_send_estimate(objset_t *tosnap, objset_t *fromsnap, uint64_t *sizep)
545 {
546 dsl_dataset_t *ds = tosnap->os_dsl_dataset;
547 dsl_dataset_t *fromds = fromsnap ? fromsnap->os_dsl_dataset : NULL;
548 dsl_pool_t *dp = ds->ds_dir->dd_pool;
549 int err;
550 uint64_t size;
551
552 /* tosnap must be a snapshot */
553 if (ds->ds_phys->ds_next_snap_obj == 0)
554 return (EINVAL);
555
556 /*
557 * fromsnap must be an earlier snapshot from the same fs as tosnap,
558 * or the origin's fs.
559 */
560 if (fromds != NULL && !is_before(ds, fromds))
561 return (EXDEV);
562
563 /* Get uncompressed size estimate of changed data. */
564 if (fromds == NULL) {
565 size = ds->ds_phys->ds_uncompressed_bytes;
566 } else {
567 uint64_t used, comp;
568 err = dsl_dataset_space_written(fromds, ds,
569 &used, &comp, &size);
570 if (err)
571 return (err);
572 }
573
574 /*
575 * Assume that space (both on-disk and in-stream) is dominated by
576 * data. We will adjust for indirect blocks and the copies property,
577 * but ignore per-object space used (eg, dnodes and DRR_OBJECT records).
578 */
579
580 /*
581 * Subtract out approximate space used by indirect blocks.
582 * Assume most space is used by data blocks (non-indirect, non-dnode).
583 * Assume all blocks are recordsize. Assume ditto blocks and
584 * internal fragmentation counter out compression.
585 *
586 * Therefore, space used by indirect blocks is sizeof(blkptr_t) per
587 * block, which we observe in practice.
588 */
589 uint64_t recordsize;
590 rw_enter(&dp->dp_config_rwlock, RW_READER);
591 err = dsl_prop_get_ds(ds, "recordsize",
592 sizeof (recordsize), 1, &recordsize, NULL);
593 rw_exit(&dp->dp_config_rwlock);
594 if (err)
595 return (err);
596 size -= size / recordsize * sizeof (blkptr_t);
597
598 /* Add in the space for the record associated with each block. */
599 size += size / recordsize * sizeof (dmu_replay_record_t);
600
601 *sizep = size;
602
603 return (0);
604 }
605
606 struct recvbeginsyncarg {
607 const char *tofs;
608 const char *tosnap;
609 dsl_dataset_t *origin;
610 uint64_t fromguid;
611 dmu_objset_type_t type;
612 void *tag;
613 boolean_t force;
614 uint64_t dsflags;
615 char clonelastname[MAXNAMELEN];
616 dsl_dataset_t *ds; /* the ds to recv into; returned from the syncfunc */
617 cred_t *cr;
618 };
619
620 /* ARGSUSED */
621 static int
622 recv_new_check(void *arg1, void *arg2, dmu_tx_t *tx)
623 {
624 dsl_dir_t *dd = arg1;
625 struct recvbeginsyncarg *rbsa = arg2;
626 objset_t *mos = dd->dd_pool->dp_meta_objset;
627 uint64_t val;
628 int err;
629
630 err = zap_lookup(mos, dd->dd_phys->dd_child_dir_zapobj,
631 strrchr(rbsa->tofs, '/') + 1, sizeof (uint64_t), 1, &val);
632
633 if (err != ENOENT)
634 return (err ? err : EEXIST);
635
636 if (rbsa->origin) {
637 /* make sure it's a snap in the same pool */
638 if (rbsa->origin->ds_dir->dd_pool != dd->dd_pool)
639 return (EXDEV);
640 if (!dsl_dataset_is_snapshot(rbsa->origin))
641 return (EINVAL);
642 if (rbsa->origin->ds_phys->ds_guid != rbsa->fromguid)
643 return (ENODEV);
644 }
645
646 return (0);
647 }
648
649 static void
650 recv_new_sync(void *arg1, void *arg2, dmu_tx_t *tx)
651 {
652 dsl_dir_t *dd = arg1;
653 struct recvbeginsyncarg *rbsa = arg2;
654 uint64_t flags = DS_FLAG_INCONSISTENT | rbsa->dsflags;
655 uint64_t dsobj;
656
657 /* Create and open new dataset. */
658 dsobj = dsl_dataset_create_sync(dd, strrchr(rbsa->tofs, '/') + 1,
659 rbsa->origin, flags, rbsa->cr, tx);
660 VERIFY(0 == dsl_dataset_own_obj(dd->dd_pool, dsobj,
661 B_TRUE, dmu_recv_tag, &rbsa->ds));
662
663 if (rbsa->origin == NULL) {
664 (void) dmu_objset_create_impl(dd->dd_pool->dp_spa,
665 rbsa->ds, &rbsa->ds->ds_phys->ds_bp, rbsa->type, tx);
666 }
667
668 spa_history_log_internal_ds(rbsa->ds, "receive new", tx, "");
669 }
670
671 /* ARGSUSED */
672 static int
673 recv_existing_check(void *arg1, void *arg2, dmu_tx_t *tx)
674 {
675 dsl_dataset_t *ds = arg1;
676 struct recvbeginsyncarg *rbsa = arg2;
677 int err;
678 uint64_t val;
679
680 /* must not have any changes since most recent snapshot */
681 if (!rbsa->force && dsl_dataset_modified_since_lastsnap(ds))
682 return (ETXTBSY);
683
684 /* new snapshot name must not exist */
685 err = zap_lookup(ds->ds_dir->dd_pool->dp_meta_objset,
686 ds->ds_phys->ds_snapnames_zapobj, rbsa->tosnap, 8, 1, &val);
687 if (err == 0)
688 return (EEXIST);
689 if (err != ENOENT)
690 return (err);
691
692 if (rbsa->fromguid) {
693 /* if incremental, most recent snapshot must match fromguid */
694 if (ds->ds_prev == NULL)
695 return (ENODEV);
696
697 /*
698 * most recent snapshot must match fromguid, or there are no
699 * changes since the fromguid one
700 */
701 if (ds->ds_prev->ds_phys->ds_guid != rbsa->fromguid) {
702 uint64_t birth = ds->ds_prev->ds_phys->ds_bp.blk_birth;
703 uint64_t obj = ds->ds_prev->ds_phys->ds_prev_snap_obj;
704 while (obj != 0) {
705 dsl_dataset_t *snap;
706 err = dsl_dataset_hold_obj(ds->ds_dir->dd_pool,
707 obj, FTAG, &snap);
708 if (err)
709 return (ENODEV);
710 if (snap->ds_phys->ds_creation_txg < birth) {
711 dsl_dataset_rele(snap, FTAG);
712 return (ENODEV);
713 }
714 if (snap->ds_phys->ds_guid == rbsa->fromguid) {
715 dsl_dataset_rele(snap, FTAG);
716 break; /* it's ok */
717 }
718 obj = snap->ds_phys->ds_prev_snap_obj;
719 dsl_dataset_rele(snap, FTAG);
720 }
721 if (obj == 0)
722 return (ENODEV);
723 }
724 } else {
725 /* if full, most recent snapshot must be $ORIGIN */
726 if (ds->ds_phys->ds_prev_snap_txg >= TXG_INITIAL)
727 return (ENODEV);
728 }
729
730 /* temporary clone name must not exist */
731 err = zap_lookup(ds->ds_dir->dd_pool->dp_meta_objset,
732 ds->ds_dir->dd_phys->dd_child_dir_zapobj,
733 rbsa->clonelastname, 8, 1, &val);
734 if (err == 0)
735 return (EEXIST);
736 if (err != ENOENT)
737 return (err);
738
739 return (0);
740 }
741
742 /* ARGSUSED */
743 static void
744 recv_existing_sync(void *arg1, void *arg2, dmu_tx_t *tx)
745 {
746 dsl_dataset_t *ohds = arg1;
747 struct recvbeginsyncarg *rbsa = arg2;
748 dsl_pool_t *dp = ohds->ds_dir->dd_pool;
749 dsl_dataset_t *cds;
750 uint64_t flags = DS_FLAG_INCONSISTENT | rbsa->dsflags;
751 uint64_t dsobj;
752
753 /* create and open the temporary clone */
754 dsobj = dsl_dataset_create_sync(ohds->ds_dir, rbsa->clonelastname,
755 ohds->ds_prev, flags, rbsa->cr, tx);
756 VERIFY(0 == dsl_dataset_own_obj(dp, dsobj, B_TRUE, dmu_recv_tag, &cds));
757
758 /*
759 * If we actually created a non-clone, we need to create the
760 * objset in our new dataset.
761 */
762 if (BP_IS_HOLE(dsl_dataset_get_blkptr(cds))) {
763 (void) dmu_objset_create_impl(dp->dp_spa,
764 cds, dsl_dataset_get_blkptr(cds), rbsa->type, tx);
765 }
766
767 rbsa->ds = cds;
768
769 spa_history_log_internal_ds(cds, "receive over existing", tx, "");
770 }
771
772 static boolean_t
773 dmu_recv_verify_features(dsl_dataset_t *ds, struct drr_begin *drrb)
774 {
775 int featureflags;
776
777 featureflags = DMU_GET_FEATUREFLAGS(drrb->drr_versioninfo);
778
779 /* Verify pool version supports SA if SA_SPILL feature set */
780 return ((featureflags & DMU_BACKUP_FEATURE_SA_SPILL) &&
781 (spa_version(dsl_dataset_get_spa(ds)) < SPA_VERSION_SA));
782 }
783
784 /*
785 * NB: callers *MUST* call dmu_recv_stream() if dmu_recv_begin()
786 * succeeds; otherwise we will leak the holds on the datasets.
787 */
788 int
789 dmu_recv_begin(char *tofs, char *tosnap, char *top_ds, struct drr_begin *drrb,
790 boolean_t force, objset_t *origin, dmu_recv_cookie_t *drc)
791 {
792 int err = 0;
793 boolean_t byteswap;
794 struct recvbeginsyncarg rbsa = { 0 };
795 uint64_t versioninfo;
796 int flags;
797 dsl_dataset_t *ds;
798
799 if (drrb->drr_magic == DMU_BACKUP_MAGIC)
800 byteswap = FALSE;
801 else if (drrb->drr_magic == BSWAP_64(DMU_BACKUP_MAGIC))
802 byteswap = TRUE;
803 else
804 return (EINVAL);
805
806 rbsa.tofs = tofs;
807 rbsa.tosnap = tosnap;
808 rbsa.origin = origin ? origin->os_dsl_dataset : NULL;
809 rbsa.fromguid = drrb->drr_fromguid;
810 rbsa.type = drrb->drr_type;
811 rbsa.tag = FTAG;
812 rbsa.dsflags = 0;
813 rbsa.cr = CRED();
814 versioninfo = drrb->drr_versioninfo;
815 flags = drrb->drr_flags;
816
817 if (byteswap) {
818 rbsa.type = BSWAP_32(rbsa.type);
819 rbsa.fromguid = BSWAP_64(rbsa.fromguid);
820 versioninfo = BSWAP_64(versioninfo);
821 flags = BSWAP_32(flags);
822 }
823
824 if (DMU_GET_STREAM_HDRTYPE(versioninfo) == DMU_COMPOUNDSTREAM ||
825 rbsa.type >= DMU_OST_NUMTYPES ||
826 ((flags & DRR_FLAG_CLONE) && origin == NULL))
827 return (EINVAL);
828
829 if (flags & DRR_FLAG_CI_DATA)
830 rbsa.dsflags = DS_FLAG_CI_DATASET;
831
832 bzero(drc, sizeof (dmu_recv_cookie_t));
833 drc->drc_drrb = drrb;
834 drc->drc_tosnap = tosnap;
835 drc->drc_top_ds = top_ds;
836 drc->drc_force = force;
837
838 /*
839 * Process the begin in syncing context.
840 */
841
842 /* open the dataset we are logically receiving into */
843 err = dsl_dataset_hold(tofs, dmu_recv_tag, &ds);
844 if (err == 0) {
845 if (dmu_recv_verify_features(ds, drrb)) {
846 dsl_dataset_rele(ds, dmu_recv_tag);
847 return (ENOTSUP);
848 }
849 /* target fs already exists; recv into temp clone */
850
851 /* Can't recv a clone into an existing fs */
852 if (flags & DRR_FLAG_CLONE) {
853 dsl_dataset_rele(ds, dmu_recv_tag);
854 return (EINVAL);
855 }
856
857 /* must not have an incremental recv already in progress */
858 if (!mutex_tryenter(&ds->ds_recvlock)) {
859 dsl_dataset_rele(ds, dmu_recv_tag);
860 return (EBUSY);
861 }
862
863 /* tmp clone name is: tofs/%tosnap" */
864 (void) snprintf(rbsa.clonelastname, sizeof (rbsa.clonelastname),
865 "%%%s", tosnap);
866 rbsa.force = force;
867 err = dsl_sync_task_do(ds->ds_dir->dd_pool,
868 recv_existing_check, recv_existing_sync, ds, &rbsa, 5);
869 if (err) {
870 mutex_exit(&ds->ds_recvlock);
871 dsl_dataset_rele(ds, dmu_recv_tag);
872 return (err);
873 }
874 drc->drc_logical_ds = ds;
875 drc->drc_real_ds = rbsa.ds;
876 } else if (err == ENOENT) {
877 /* target fs does not exist; must be a full backup or clone */
878 char *cp;
879
880 /*
881 * If it's a non-clone incremental, we are missing the
882 * target fs, so fail the recv.
883 */
884 if (rbsa.fromguid && !(flags & DRR_FLAG_CLONE))
885 return (ENOENT);
886
887 /* Open the parent of tofs */
888 cp = strrchr(tofs, '/');
889 *cp = '\0';
890 err = dsl_dataset_hold(tofs, FTAG, &ds);
891 *cp = '/';
892 if (err)
893 return (err);
894
895 if (dmu_recv_verify_features(ds, drrb)) {
896 dsl_dataset_rele(ds, FTAG);
897 return (ENOTSUP);
898 }
899
900 err = dsl_sync_task_do(ds->ds_dir->dd_pool,
901 recv_new_check, recv_new_sync, ds->ds_dir, &rbsa, 5);
902 dsl_dataset_rele(ds, FTAG);
903 if (err)
904 return (err);
905 drc->drc_logical_ds = drc->drc_real_ds = rbsa.ds;
906 drc->drc_newfs = B_TRUE;
907 }
908
909 return (err);
910 }
911
912 struct restorearg {
913 int err;
914 int byteswap;
915 vnode_t *vp;
916 char *buf;
917 uint64_t voff;
918 int bufsize; /* amount of memory allocated for buf */
919 zio_cksum_t cksum;
920 avl_tree_t *guid_to_ds_map;
921 };
922
923 typedef struct guid_map_entry {
924 uint64_t guid;
925 dsl_dataset_t *gme_ds;
926 avl_node_t avlnode;
927 } guid_map_entry_t;
928
929 static int
930 guid_compare(const void *arg1, const void *arg2)
931 {
932 const guid_map_entry_t *gmep1 = arg1;
933 const guid_map_entry_t *gmep2 = arg2;
934
935 if (gmep1->guid < gmep2->guid)
936 return (-1);
937 else if (gmep1->guid > gmep2->guid)
938 return (1);
939 return (0);
940 }
941
942 static void
943 free_guid_map_onexit(void *arg)
944 {
945 avl_tree_t *ca = arg;
946 void *cookie = NULL;
947 guid_map_entry_t *gmep;
948
949 while ((gmep = avl_destroy_nodes(ca, &cookie)) != NULL) {
950 dsl_dataset_rele(gmep->gme_ds, ca);
951 kmem_free(gmep, sizeof (guid_map_entry_t));
952 }
953 avl_destroy(ca);
954 kmem_free(ca, sizeof (avl_tree_t));
955 }
956
957 static void *
958 restore_read(struct restorearg *ra, int len)
959 {
960 void *rv;
961 int done = 0;
962
963 /* some things will require 8-byte alignment, so everything must */
964 ASSERT0(len % 8);
965
966 while (done < len) {
967 ssize_t resid;
968
969 ra->err = vn_rdwr(UIO_READ, ra->vp,
970 (caddr_t)ra->buf + done, len - done,
971 ra->voff, UIO_SYSSPACE, FAPPEND,
972 RLIM64_INFINITY, CRED(), &resid);
973
974 if (resid == len - done)
975 ra->err = EINVAL;
976 ra->voff += len - done - resid;
977 done = len - resid;
978 if (ra->err)
979 return (NULL);
980 }
981
982 ASSERT3U(done, ==, len);
983 rv = ra->buf;
984 if (ra->byteswap)
985 fletcher_4_incremental_byteswap(rv, len, &ra->cksum);
986 else
987 fletcher_4_incremental_native(rv, len, &ra->cksum);
988 return (rv);
989 }
990
991 static void
992 backup_byteswap(dmu_replay_record_t *drr)
993 {
994 #define DO64(X) (drr->drr_u.X = BSWAP_64(drr->drr_u.X))
995 #define DO32(X) (drr->drr_u.X = BSWAP_32(drr->drr_u.X))
996 drr->drr_type = BSWAP_32(drr->drr_type);
997 drr->drr_payloadlen = BSWAP_32(drr->drr_payloadlen);
998 switch (drr->drr_type) {
999 case DRR_BEGIN:
1000 DO64(drr_begin.drr_magic);
1001 DO64(drr_begin.drr_versioninfo);
1002 DO64(drr_begin.drr_creation_time);
1003 DO32(drr_begin.drr_type);
1004 DO32(drr_begin.drr_flags);
1005 DO64(drr_begin.drr_toguid);
1006 DO64(drr_begin.drr_fromguid);
1007 break;
1008 case DRR_OBJECT:
1009 DO64(drr_object.drr_object);
1010 /* DO64(drr_object.drr_allocation_txg); */
1011 DO32(drr_object.drr_type);
1012 DO32(drr_object.drr_bonustype);
1013 DO32(drr_object.drr_blksz);
1014 DO32(drr_object.drr_bonuslen);
1015 DO64(drr_object.drr_toguid);
1016 break;
1017 case DRR_FREEOBJECTS:
1018 DO64(drr_freeobjects.drr_firstobj);
1019 DO64(drr_freeobjects.drr_numobjs);
1020 DO64(drr_freeobjects.drr_toguid);
1021 break;
1022 case DRR_WRITE:
1023 DO64(drr_write.drr_object);
1024 DO32(drr_write.drr_type);
1025 DO64(drr_write.drr_offset);
1026 DO64(drr_write.drr_length);
1027 DO64(drr_write.drr_toguid);
1028 DO64(drr_write.drr_key.ddk_cksum.zc_word[0]);
1029 DO64(drr_write.drr_key.ddk_cksum.zc_word[1]);
1030 DO64(drr_write.drr_key.ddk_cksum.zc_word[2]);
1031 DO64(drr_write.drr_key.ddk_cksum.zc_word[3]);
1032 DO64(drr_write.drr_key.ddk_prop);
1033 break;
1034 case DRR_WRITE_BYREF:
1035 DO64(drr_write_byref.drr_object);
1036 DO64(drr_write_byref.drr_offset);
1037 DO64(drr_write_byref.drr_length);
1038 DO64(drr_write_byref.drr_toguid);
1039 DO64(drr_write_byref.drr_refguid);
1040 DO64(drr_write_byref.drr_refobject);
1041 DO64(drr_write_byref.drr_refoffset);
1042 DO64(drr_write_byref.drr_key.ddk_cksum.zc_word[0]);
1043 DO64(drr_write_byref.drr_key.ddk_cksum.zc_word[1]);
1044 DO64(drr_write_byref.drr_key.ddk_cksum.zc_word[2]);
1045 DO64(drr_write_byref.drr_key.ddk_cksum.zc_word[3]);
1046 DO64(drr_write_byref.drr_key.ddk_prop);
1047 break;
1048 case DRR_FREE:
1049 DO64(drr_free.drr_object);
1050 DO64(drr_free.drr_offset);
1051 DO64(drr_free.drr_length);
1052 DO64(drr_free.drr_toguid);
1053 break;
1054 case DRR_SPILL:
1055 DO64(drr_spill.drr_object);
1056 DO64(drr_spill.drr_length);
1057 DO64(drr_spill.drr_toguid);
1058 break;
1059 case DRR_END:
1060 DO64(drr_end.drr_checksum.zc_word[0]);
1061 DO64(drr_end.drr_checksum.zc_word[1]);
1062 DO64(drr_end.drr_checksum.zc_word[2]);
1063 DO64(drr_end.drr_checksum.zc_word[3]);
1064 DO64(drr_end.drr_toguid);
1065 break;
1066 }
1067 #undef DO64
1068 #undef DO32
1069 }
1070
1071 static int
1072 restore_object(struct restorearg *ra, objset_t *os, struct drr_object *drro)
1073 {
1074 int err;
1075 dmu_tx_t *tx;
1076 void *data = NULL;
1077
1078 if (drro->drr_type == DMU_OT_NONE ||
1079 !DMU_OT_IS_VALID(drro->drr_type) ||
1080 !DMU_OT_IS_VALID(drro->drr_bonustype) ||
1081 drro->drr_checksumtype >= ZIO_CHECKSUM_FUNCTIONS ||
1082 drro->drr_compress >= ZIO_COMPRESS_FUNCTIONS ||
1083 P2PHASE(drro->drr_blksz, SPA_MINBLOCKSIZE) ||
1084 drro->drr_blksz < SPA_MINBLOCKSIZE ||
1085 drro->drr_blksz > SPA_MAXBLOCKSIZE ||
1086 drro->drr_bonuslen > DN_MAX_BONUSLEN) {
1087 return (EINVAL);
1088 }
1089
1090 err = dmu_object_info(os, drro->drr_object, NULL);
1091
1092 if (err != 0 && err != ENOENT)
1093 return (EINVAL);
1094
1095 if (drro->drr_bonuslen) {
1096 data = restore_read(ra, P2ROUNDUP(drro->drr_bonuslen, 8));
1097 if (ra->err)
1098 return (ra->err);
1099 }
1100
1101 if (err == ENOENT) {
1102 /* currently free, want to be allocated */
1103 tx = dmu_tx_create(os);
1104 dmu_tx_hold_bonus(tx, DMU_NEW_OBJECT);
1105 err = dmu_tx_assign(tx, TXG_WAIT);
1106 if (err) {
1107 dmu_tx_abort(tx);
1108 return (err);
1109 }
1110 err = dmu_object_claim(os, drro->drr_object,
1111 drro->drr_type, drro->drr_blksz,
1112 drro->drr_bonustype, drro->drr_bonuslen, tx);
1113 dmu_tx_commit(tx);
1114 } else {
1115 /* currently allocated, want to be allocated */
1116 err = dmu_object_reclaim(os, drro->drr_object,
1117 drro->drr_type, drro->drr_blksz,
1118 drro->drr_bonustype, drro->drr_bonuslen);
1119 }
1120 if (err) {
1121 return (EINVAL);
1122 }
1123
1124 tx = dmu_tx_create(os);
1125 dmu_tx_hold_bonus(tx, drro->drr_object);
1126 err = dmu_tx_assign(tx, TXG_WAIT);
1127 if (err) {
1128 dmu_tx_abort(tx);
1129 return (err);
1130 }
1131
1132 dmu_object_set_checksum(os, drro->drr_object, drro->drr_checksumtype,
1133 tx);
1134 dmu_object_set_compress(os, drro->drr_object, drro->drr_compress, tx);
1135
1136 if (data != NULL) {
1137 dmu_buf_t *db;
1138
1139 VERIFY(0 == dmu_bonus_hold(os, drro->drr_object, FTAG, &db));
1140 dmu_buf_will_dirty(db, tx);
1141
1142 ASSERT3U(db->db_size, >=, drro->drr_bonuslen);
1143 bcopy(data, db->db_data, drro->drr_bonuslen);
1144 if (ra->byteswap) {
1145 dmu_object_byteswap_t byteswap =
1146 DMU_OT_BYTESWAP(drro->drr_bonustype);
1147 dmu_ot_byteswap[byteswap].ob_func(db->db_data,
1148 drro->drr_bonuslen);
1149 }
1150 dmu_buf_rele(db, FTAG);
1151 }
1152 dmu_tx_commit(tx);
1153 return (0);
1154 }
1155
1156 /* ARGSUSED */
1157 static int
1158 restore_freeobjects(struct restorearg *ra, objset_t *os,
1159 struct drr_freeobjects *drrfo)
1160 {
1161 uint64_t obj;
1162
1163 if (drrfo->drr_firstobj + drrfo->drr_numobjs < drrfo->drr_firstobj)
1164 return (EINVAL);
1165
1166 for (obj = drrfo->drr_firstobj;
1167 obj < drrfo->drr_firstobj + drrfo->drr_numobjs;
1168 (void) dmu_object_next(os, &obj, FALSE, 0)) {
1169 int err;
1170
1171 if (dmu_object_info(os, obj, NULL) != 0)
1172 continue;
1173
1174 err = dmu_free_object(os, obj);
1175 if (err)
1176 return (err);
1177 }
1178 return (0);
1179 }
1180
1181 static int
1182 restore_write(struct restorearg *ra, objset_t *os,
1183 struct drr_write *drrw)
1184 {
1185 dmu_tx_t *tx;
1186 void *data;
1187 int err;
1188
1189 if (drrw->drr_offset + drrw->drr_length < drrw->drr_offset ||
1190 !DMU_OT_IS_VALID(drrw->drr_type))
1191 return (EINVAL);
1192
1193 data = restore_read(ra, drrw->drr_length);
1194 if (data == NULL)
1195 return (ra->err);
1196
1197 if (dmu_object_info(os, drrw->drr_object, NULL) != 0)
1198 return (EINVAL);
1199
1200 tx = dmu_tx_create(os);
1201
1202 dmu_tx_hold_write(tx, drrw->drr_object,
1203 drrw->drr_offset, drrw->drr_length);
1204 err = dmu_tx_assign(tx, TXG_WAIT);
1205 if (err) {
1206 dmu_tx_abort(tx);
1207 return (err);
1208 }
1209 if (ra->byteswap) {
1210 dmu_object_byteswap_t byteswap =
1211 DMU_OT_BYTESWAP(drrw->drr_type);
1212 dmu_ot_byteswap[byteswap].ob_func(data, drrw->drr_length);
1213 }
1214 dmu_write(os, drrw->drr_object,
1215 drrw->drr_offset, drrw->drr_length, data, tx);
1216 dmu_tx_commit(tx);
1217 return (0);
1218 }
1219
1220 /*
1221 * Handle a DRR_WRITE_BYREF record. This record is used in dedup'ed
1222 * streams to refer to a copy of the data that is already on the
1223 * system because it came in earlier in the stream. This function
1224 * finds the earlier copy of the data, and uses that copy instead of
1225 * data from the stream to fulfill this write.
1226 */
1227 static int
1228 restore_write_byref(struct restorearg *ra, objset_t *os,
1229 struct drr_write_byref *drrwbr)
1230 {
1231 dmu_tx_t *tx;
1232 int err;
1233 guid_map_entry_t gmesrch;
1234 guid_map_entry_t *gmep;
1235 avl_index_t where;
1236 objset_t *ref_os = NULL;
1237 dmu_buf_t *dbp;
1238
1239 if (drrwbr->drr_offset + drrwbr->drr_length < drrwbr->drr_offset)
1240 return (EINVAL);
1241
1242 /*
1243 * If the GUID of the referenced dataset is different from the
1244 * GUID of the target dataset, find the referenced dataset.
1245 */
1246 if (drrwbr->drr_toguid != drrwbr->drr_refguid) {
1247 gmesrch.guid = drrwbr->drr_refguid;
1248 if ((gmep = avl_find(ra->guid_to_ds_map, &gmesrch,
1249 &where)) == NULL) {
1250 return (EINVAL);
1251 }
1252 if (dmu_objset_from_ds(gmep->gme_ds, &ref_os))
1253 return (EINVAL);
1254 } else {
1255 ref_os = os;
1256 }
1257
1258 if (err = dmu_buf_hold(ref_os, drrwbr->drr_refobject,
1259 drrwbr->drr_refoffset, FTAG, &dbp, DMU_READ_PREFETCH))
1260 return (err);
1261
1262 tx = dmu_tx_create(os);
1263
1264 dmu_tx_hold_write(tx, drrwbr->drr_object,
1265 drrwbr->drr_offset, drrwbr->drr_length);
1266 err = dmu_tx_assign(tx, TXG_WAIT);
1267 if (err) {
1268 dmu_tx_abort(tx);
1269 return (err);
1270 }
1271 dmu_write(os, drrwbr->drr_object,
1272 drrwbr->drr_offset, drrwbr->drr_length, dbp->db_data, tx);
1273 dmu_buf_rele(dbp, FTAG);
1274 dmu_tx_commit(tx);
1275 return (0);
1276 }
1277
1278 static int
1279 restore_spill(struct restorearg *ra, objset_t *os, struct drr_spill *drrs)
1280 {
1281 dmu_tx_t *tx;
1282 void *data;
1283 dmu_buf_t *db, *db_spill;
1284 int err;
1285
1286 if (drrs->drr_length < SPA_MINBLOCKSIZE ||
1287 drrs->drr_length > SPA_MAXBLOCKSIZE)
1288 return (EINVAL);
1289
1290 data = restore_read(ra, drrs->drr_length);
1291 if (data == NULL)
1292 return (ra->err);
1293
1294 if (dmu_object_info(os, drrs->drr_object, NULL) != 0)
1295 return (EINVAL);
1296
1297 VERIFY(0 == dmu_bonus_hold(os, drrs->drr_object, FTAG, &db));
1298 if ((err = dmu_spill_hold_by_bonus(db, FTAG, &db_spill)) != 0) {
1299 dmu_buf_rele(db, FTAG);
1300 return (err);
1301 }
1302
1303 tx = dmu_tx_create(os);
1304
1305 dmu_tx_hold_spill(tx, db->db_object);
1306
1307 err = dmu_tx_assign(tx, TXG_WAIT);
1308 if (err) {
1309 dmu_buf_rele(db, FTAG);
1310 dmu_buf_rele(db_spill, FTAG);
1311 dmu_tx_abort(tx);
1312 return (err);
1313 }
1314 dmu_buf_will_dirty(db_spill, tx);
1315
1316 if (db_spill->db_size < drrs->drr_length)
1317 VERIFY(0 == dbuf_spill_set_blksz(db_spill,
1318 drrs->drr_length, tx));
1319 bcopy(data, db_spill->db_data, drrs->drr_length);
1320
1321 dmu_buf_rele(db, FTAG);
1322 dmu_buf_rele(db_spill, FTAG);
1323
1324 dmu_tx_commit(tx);
1325 return (0);
1326 }
1327
1328 /* ARGSUSED */
1329 static int
1330 restore_free(struct restorearg *ra, objset_t *os,
1331 struct drr_free *drrf)
1332 {
1333 int err;
1334
1335 if (drrf->drr_length != -1ULL &&
1336 drrf->drr_offset + drrf->drr_length < drrf->drr_offset)
1337 return (EINVAL);
1338
1339 if (dmu_object_info(os, drrf->drr_object, NULL) != 0)
1340 return (EINVAL);
1341
1342 err = dmu_free_long_range(os, drrf->drr_object,
1343 drrf->drr_offset, drrf->drr_length);
1344 return (err);
1345 }
1346
1347 /*
1348 * NB: callers *must* call dmu_recv_end() if this succeeds.
1349 */
1350 int
1351 dmu_recv_stream(dmu_recv_cookie_t *drc, vnode_t *vp, offset_t *voffp,
1352 int cleanup_fd, uint64_t *action_handlep)
1353 {
1354 struct restorearg ra = { 0 };
1355 dmu_replay_record_t *drr;
1356 objset_t *os;
1357 zio_cksum_t pcksum;
1358 int featureflags;
1359
1360 if (drc->drc_drrb->drr_magic == BSWAP_64(DMU_BACKUP_MAGIC))
1361 ra.byteswap = TRUE;
1362
1363 {
1364 /* compute checksum of drr_begin record */
1365 dmu_replay_record_t *drr;
1366 drr = kmem_zalloc(sizeof (dmu_replay_record_t), KM_SLEEP);
1367
1368 drr->drr_type = DRR_BEGIN;
1369 drr->drr_u.drr_begin = *drc->drc_drrb;
1370 if (ra.byteswap) {
1371 fletcher_4_incremental_byteswap(drr,
1372 sizeof (dmu_replay_record_t), &ra.cksum);
1373 } else {
1374 fletcher_4_incremental_native(drr,
1375 sizeof (dmu_replay_record_t), &ra.cksum);
1376 }
1377 kmem_free(drr, sizeof (dmu_replay_record_t));
1378 }
1379
1380 if (ra.byteswap) {
1381 struct drr_begin *drrb = drc->drc_drrb;
1382 drrb->drr_magic = BSWAP_64(drrb->drr_magic);
1383 drrb->drr_versioninfo = BSWAP_64(drrb->drr_versioninfo);
1384 drrb->drr_creation_time = BSWAP_64(drrb->drr_creation_time);
1385 drrb->drr_type = BSWAP_32(drrb->drr_type);
1386 drrb->drr_toguid = BSWAP_64(drrb->drr_toguid);
1387 drrb->drr_fromguid = BSWAP_64(drrb->drr_fromguid);
1388 }
1389
1390 ra.vp = vp;
1391 ra.voff = *voffp;
1392 ra.bufsize = 1<<20;
1393 ra.buf = kmem_alloc(ra.bufsize, KM_SLEEP);
1394
1395 /* these were verified in dmu_recv_begin */
1396 ASSERT(DMU_GET_STREAM_HDRTYPE(drc->drc_drrb->drr_versioninfo) ==
1397 DMU_SUBSTREAM);
1398 ASSERT(drc->drc_drrb->drr_type < DMU_OST_NUMTYPES);
1399
1400 /*
1401 * Open the objset we are modifying.
1402 */
1403 VERIFY(dmu_objset_from_ds(drc->drc_real_ds, &os) == 0);
1404
1405 ASSERT(drc->drc_real_ds->ds_phys->ds_flags & DS_FLAG_INCONSISTENT);
1406
1407 featureflags = DMU_GET_FEATUREFLAGS(drc->drc_drrb->drr_versioninfo);
1408
1409 /* if this stream is dedup'ed, set up the avl tree for guid mapping */
1410 if (featureflags & DMU_BACKUP_FEATURE_DEDUP) {
1411 minor_t minor;
1412
1413 if (cleanup_fd == -1) {
1414 ra.err = EBADF;
1415 goto out;
1416 }
1417 ra.err = zfs_onexit_fd_hold(cleanup_fd, &minor);
1418 if (ra.err) {
1419 cleanup_fd = -1;
1420 goto out;
1421 }
1422
1423 if (*action_handlep == 0) {
1424 ra.guid_to_ds_map =
1425 kmem_alloc(sizeof (avl_tree_t), KM_SLEEP);
1426 avl_create(ra.guid_to_ds_map, guid_compare,
1427 sizeof (guid_map_entry_t),
1428 offsetof(guid_map_entry_t, avlnode));
1429 ra.err = zfs_onexit_add_cb(minor,
1430 free_guid_map_onexit, ra.guid_to_ds_map,
1431 action_handlep);
1432 if (ra.err)
1433 goto out;
1434 } else {
1435 ra.err = zfs_onexit_cb_data(minor, *action_handlep,
1436 (void **)&ra.guid_to_ds_map);
1437 if (ra.err)
1438 goto out;
1439 }
1440
1441 drc->drc_guid_to_ds_map = ra.guid_to_ds_map;
1442 }
1443
1444 /*
1445 * Read records and process them.
1446 */
1447 pcksum = ra.cksum;
1448 while (ra.err == 0 &&
1449 NULL != (drr = restore_read(&ra, sizeof (*drr)))) {
1450 if (issig(JUSTLOOKING) && issig(FORREAL)) {
1451 ra.err = EINTR;
1452 goto out;
1453 }
1454
1455 if (ra.byteswap)
1456 backup_byteswap(drr);
1457
1458 switch (drr->drr_type) {
1459 case DRR_OBJECT:
1460 {
1461 /*
1462 * We need to make a copy of the record header,
1463 * because restore_{object,write} may need to
1464 * restore_read(), which will invalidate drr.
1465 */
1466 struct drr_object drro = drr->drr_u.drr_object;
1467 ra.err = restore_object(&ra, os, &drro);
1468 break;
1469 }
1470 case DRR_FREEOBJECTS:
1471 {
1472 struct drr_freeobjects drrfo =
1473 drr->drr_u.drr_freeobjects;
1474 ra.err = restore_freeobjects(&ra, os, &drrfo);
1475 break;
1476 }
1477 case DRR_WRITE:
1478 {
1479 struct drr_write drrw = drr->drr_u.drr_write;
1480 ra.err = restore_write(&ra, os, &drrw);
1481 break;
1482 }
1483 case DRR_WRITE_BYREF:
1484 {
1485 struct drr_write_byref drrwbr =
1486 drr->drr_u.drr_write_byref;
1487 ra.err = restore_write_byref(&ra, os, &drrwbr);
1488 break;
1489 }
1490 case DRR_FREE:
1491 {
1492 struct drr_free drrf = drr->drr_u.drr_free;
1493 ra.err = restore_free(&ra, os, &drrf);
1494 break;
1495 }
1496 case DRR_END:
1497 {
1498 struct drr_end drre = drr->drr_u.drr_end;
1499 /*
1500 * We compare against the *previous* checksum
1501 * value, because the stored checksum is of
1502 * everything before the DRR_END record.
1503 */
1504 if (!ZIO_CHECKSUM_EQUAL(drre.drr_checksum, pcksum))
1505 ra.err = ECKSUM;
1506 goto out;
1507 }
1508 case DRR_SPILL:
1509 {
1510 struct drr_spill drrs = drr->drr_u.drr_spill;
1511 ra.err = restore_spill(&ra, os, &drrs);
1512 break;
1513 }
1514 default:
1515 ra.err = EINVAL;
1516 goto out;
1517 }
1518 pcksum = ra.cksum;
1519 }
1520 ASSERT(ra.err != 0);
1521
1522 out:
1523 if ((featureflags & DMU_BACKUP_FEATURE_DEDUP) && (cleanup_fd != -1))
1524 zfs_onexit_fd_rele(cleanup_fd);
1525
1526 if (ra.err != 0) {
1527 /*
1528 * destroy what we created, so we don't leave it in the
1529 * inconsistent restoring state.
1530 */
1531 txg_wait_synced(drc->drc_real_ds->ds_dir->dd_pool, 0);
1532
1533 (void) dsl_dataset_destroy(drc->drc_real_ds, dmu_recv_tag,
1534 B_FALSE);
1535 if (drc->drc_real_ds != drc->drc_logical_ds) {
1536 mutex_exit(&drc->drc_logical_ds->ds_recvlock);
1537 dsl_dataset_rele(drc->drc_logical_ds, dmu_recv_tag);
1538 }
1539 }
1540
1541 kmem_free(ra.buf, ra.bufsize);
1542 *voffp = ra.voff;
1543 return (ra.err);
1544 }
1545
1546 struct recvendsyncarg {
1547 char *tosnap;
1548 uint64_t creation_time;
1549 uint64_t toguid;
1550 };
1551
1552 static int
1553 recv_end_check(void *arg1, void *arg2, dmu_tx_t *tx)
1554 {
1555 dsl_dataset_t *ds = arg1;
1556 struct recvendsyncarg *resa = arg2;
1557
1558 return (dsl_dataset_snapshot_check(ds, resa->tosnap, tx));
1559 }
1560
1561 static void
1562 recv_end_sync(void *arg1, void *arg2, dmu_tx_t *tx)
1563 {
1564 dsl_dataset_t *ds = arg1;
1565 struct recvendsyncarg *resa = arg2;
1566
1567 dsl_dataset_snapshot_sync(ds, resa->tosnap, tx);
1568
1569 /* set snapshot's creation time and guid */
1570 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx);
1571 ds->ds_prev->ds_phys->ds_creation_time = resa->creation_time;
1572 ds->ds_prev->ds_phys->ds_guid = resa->toguid;
1573 ds->ds_prev->ds_phys->ds_flags &= ~DS_FLAG_INCONSISTENT;
1574
1575 dmu_buf_will_dirty(ds->ds_dbuf, tx);
1576 ds->ds_phys->ds_flags &= ~DS_FLAG_INCONSISTENT;
1577 spa_history_log_internal_ds(ds, "finished receiving", tx, "");
1578 }
1579
1580 static int
1581 add_ds_to_guidmap(avl_tree_t *guid_map, dsl_dataset_t *ds)
1582 {
1583 dsl_pool_t *dp = ds->ds_dir->dd_pool;
1584 uint64_t snapobj = ds->ds_phys->ds_prev_snap_obj;
1585 dsl_dataset_t *snapds;
1586 guid_map_entry_t *gmep;
1587 int err;
1588
1589 ASSERT(guid_map != NULL);
1590
1591 rw_enter(&dp->dp_config_rwlock, RW_READER);
1592 err = dsl_dataset_hold_obj(dp, snapobj, guid_map, &snapds);
1593 if (err == 0) {
1594 gmep = kmem_alloc(sizeof (guid_map_entry_t), KM_SLEEP);
1595 gmep->guid = snapds->ds_phys->ds_guid;
1596 gmep->gme_ds = snapds;
1597 avl_add(guid_map, gmep);
1598 }
1599
1600 rw_exit(&dp->dp_config_rwlock);
1601 return (err);
1602 }
1603
1604 static int
1605 dmu_recv_existing_end(dmu_recv_cookie_t *drc)
1606 {
1607 struct recvendsyncarg resa;
1608 dsl_dataset_t *ds = drc->drc_logical_ds;
1609 int err, myerr;
1610
1611 if (dsl_dataset_tryown(ds, FALSE, dmu_recv_tag)) {
1612 err = dsl_dataset_clone_swap(drc->drc_real_ds, ds,
1613 drc->drc_force);
1614 if (err)
1615 goto out;
1616 } else {
1617 mutex_exit(&ds->ds_recvlock);
1618 dsl_dataset_rele(ds, dmu_recv_tag);
1619 (void) dsl_dataset_destroy(drc->drc_real_ds, dmu_recv_tag,
1620 B_FALSE);
1621 return (EBUSY);
1622 }
1623
1624 resa.creation_time = drc->drc_drrb->drr_creation_time;
1625 resa.toguid = drc->drc_drrb->drr_toguid;
1626 resa.tosnap = drc->drc_tosnap;
1627
1628 err = dsl_sync_task_do(ds->ds_dir->dd_pool,
1629 recv_end_check, recv_end_sync, ds, &resa, 3);
1630 if (err) {
1631 /* swap back */
1632 (void) dsl_dataset_clone_swap(drc->drc_real_ds, ds, B_TRUE);
1633 }
1634
1635 out:
1636 mutex_exit(&ds->ds_recvlock);
1637 if (err == 0 && drc->drc_guid_to_ds_map != NULL)
1638 (void) add_ds_to_guidmap(drc->drc_guid_to_ds_map, ds);
1639 dsl_dataset_disown(ds, dmu_recv_tag);
1640 myerr = dsl_dataset_destroy(drc->drc_real_ds, dmu_recv_tag, B_FALSE);
1641 ASSERT0(myerr);
1642 return (err);
1643 }
1644
1645 static int
1646 dmu_recv_new_end(dmu_recv_cookie_t *drc)
1647 {
1648 struct recvendsyncarg resa;
1649 dsl_dataset_t *ds = drc->drc_logical_ds;
1650 int err;
1651
1652 /*
1653 * XXX hack; seems the ds is still dirty and dsl_pool_zil_clean()
1654 * expects it to have a ds_user_ptr (and zil), but clone_swap()
1655 * can close it.
1656 */
1657 txg_wait_synced(ds->ds_dir->dd_pool, 0);
1658
1659 resa.creation_time = drc->drc_drrb->drr_creation_time;
1660 resa.toguid = drc->drc_drrb->drr_toguid;
1661 resa.tosnap = drc->drc_tosnap;
1662
1663 err = dsl_sync_task_do(ds->ds_dir->dd_pool,
1664 recv_end_check, recv_end_sync, ds, &resa, 3);
1665 if (err) {
1666 /* clean up the fs we just recv'd into */
1667 (void) dsl_dataset_destroy(ds, dmu_recv_tag, B_FALSE);
1668 } else {
1669 if (drc->drc_guid_to_ds_map != NULL)
1670 (void) add_ds_to_guidmap(drc->drc_guid_to_ds_map, ds);
1671 /* release the hold from dmu_recv_begin */
1672 dsl_dataset_disown(ds, dmu_recv_tag);
1673 }
1674 return (err);
1675 }
1676
1677 int
1678 dmu_recv_end(dmu_recv_cookie_t *drc)
1679 {
1680 if (drc->drc_logical_ds != drc->drc_real_ds)
1681 return (dmu_recv_existing_end(drc));
1682 else
1683 return (dmu_recv_new_end(drc));
1684 }
Unleashed OS