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