dmu_send.c revision 290756
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) 2011, 2015 by Delphix. All rights reserved. 25 * Copyright (c) 2014, Joyent, Inc. All rights reserved. 26 * Copyright (c) 2012, Martin Matuska <mm@FreeBSD.org>. All rights reserved. 27 * Copyright 2014 HybridCluster. All rights reserved. 28 */ 29 30#include <sys/dmu.h> 31#include <sys/dmu_impl.h> 32#include <sys/dmu_tx.h> 33#include <sys/dbuf.h> 34#include <sys/dnode.h> 35#include <sys/zfs_context.h> 36#include <sys/dmu_objset.h> 37#include <sys/dmu_traverse.h> 38#include <sys/dsl_dataset.h> 39#include <sys/dsl_dir.h> 40#include <sys/dsl_prop.h> 41#include <sys/dsl_pool.h> 42#include <sys/dsl_synctask.h> 43#include <sys/zfs_ioctl.h> 44#include <sys/zap.h> 45#include <sys/zio_checksum.h> 46#include <sys/zfs_znode.h> 47#include <zfs_fletcher.h> 48#include <sys/avl.h> 49#include <sys/ddt.h> 50#include <sys/zfs_onexit.h> 51#include <sys/dmu_send.h> 52#include <sys/dsl_destroy.h> 53#include <sys/blkptr.h> 54#include <sys/dsl_bookmark.h> 55#include <sys/zfeature.h> 56#include <sys/bqueue.h> 57 58#ifdef __FreeBSD__ 59#undef dump_write 60#define dump_write dmu_dump_write 61#endif 62 63/* Set this tunable to TRUE to replace corrupt data with 0x2f5baddb10c */ 64int zfs_send_corrupt_data = B_FALSE; 65int zfs_send_queue_length = 16 * 1024 * 1024; 66int zfs_recv_queue_length = 16 * 1024 * 1024; 67 68static char *dmu_recv_tag = "dmu_recv_tag"; 69const char *recv_clone_name = "%recv"; 70 71#define BP_SPAN(datablkszsec, indblkshift, level) \ 72 (((uint64_t)datablkszsec) << (SPA_MINBLOCKSHIFT + \ 73 (level) * (indblkshift - SPA_BLKPTRSHIFT))) 74 75static void byteswap_record(dmu_replay_record_t *drr); 76 77struct send_thread_arg { 78 bqueue_t q; 79 dsl_dataset_t *ds; /* Dataset to traverse */ 80 uint64_t fromtxg; /* Traverse from this txg */ 81 int flags; /* flags to pass to traverse_dataset */ 82 int error_code; 83 boolean_t cancel; 84 zbookmark_phys_t resume; 85}; 86 87struct send_block_record { 88 boolean_t eos_marker; /* Marks the end of the stream */ 89 blkptr_t bp; 90 zbookmark_phys_t zb; 91 uint8_t indblkshift; 92 uint16_t datablkszsec; 93 bqueue_node_t ln; 94}; 95 96static int 97dump_bytes(dmu_sendarg_t *dsp, void *buf, int len) 98{ 99 dsl_dataset_t *ds = dmu_objset_ds(dsp->dsa_os); 100 struct uio auio; 101 struct iovec aiov; 102 ASSERT0(len % 8); 103 104 aiov.iov_base = buf; 105 aiov.iov_len = len; 106 auio.uio_iov = &aiov; 107 auio.uio_iovcnt = 1; 108 auio.uio_resid = len; 109 auio.uio_segflg = UIO_SYSSPACE; 110 auio.uio_rw = UIO_WRITE; 111 auio.uio_offset = (off_t)-1; 112 auio.uio_td = dsp->dsa_td; 113#ifdef _KERNEL 114 if (dsp->dsa_fp->f_type == DTYPE_VNODE) 115 bwillwrite(); 116 dsp->dsa_err = fo_write(dsp->dsa_fp, &auio, dsp->dsa_td->td_ucred, 0, 117 dsp->dsa_td); 118#else 119 fprintf(stderr, "%s: returning EOPNOTSUPP\n", __func__); 120 dsp->dsa_err = EOPNOTSUPP; 121#endif 122 mutex_enter(&ds->ds_sendstream_lock); 123 *dsp->dsa_off += len; 124 mutex_exit(&ds->ds_sendstream_lock); 125 126 return (dsp->dsa_err); 127} 128 129/* 130 * For all record types except BEGIN, fill in the checksum (overlaid in 131 * drr_u.drr_checksum.drr_checksum). The checksum verifies everything 132 * up to the start of the checksum itself. 133 */ 134static int 135dump_record(dmu_sendarg_t *dsp, void *payload, int payload_len) 136{ 137 ASSERT3U(offsetof(dmu_replay_record_t, drr_u.drr_checksum.drr_checksum), 138 ==, sizeof (dmu_replay_record_t) - sizeof (zio_cksum_t)); 139 fletcher_4_incremental_native(dsp->dsa_drr, 140 offsetof(dmu_replay_record_t, drr_u.drr_checksum.drr_checksum), 141 &dsp->dsa_zc); 142 if (dsp->dsa_drr->drr_type != DRR_BEGIN) { 143 ASSERT(ZIO_CHECKSUM_IS_ZERO(&dsp->dsa_drr->drr_u. 144 drr_checksum.drr_checksum)); 145 dsp->dsa_drr->drr_u.drr_checksum.drr_checksum = dsp->dsa_zc; 146 } 147 fletcher_4_incremental_native(&dsp->dsa_drr-> 148 drr_u.drr_checksum.drr_checksum, 149 sizeof (zio_cksum_t), &dsp->dsa_zc); 150 if (dump_bytes(dsp, dsp->dsa_drr, sizeof (dmu_replay_record_t)) != 0) 151 return (SET_ERROR(EINTR)); 152 if (payload_len != 0) { 153 fletcher_4_incremental_native(payload, payload_len, 154 &dsp->dsa_zc); 155 if (dump_bytes(dsp, payload, payload_len) != 0) 156 return (SET_ERROR(EINTR)); 157 } 158 return (0); 159} 160 161static int 162dump_free(dmu_sendarg_t *dsp, uint64_t object, uint64_t offset, 163 uint64_t length) 164{ 165 struct drr_free *drrf = &(dsp->dsa_drr->drr_u.drr_free); 166 167 /* 168 * When we receive a free record, dbuf_free_range() assumes 169 * that the receiving system doesn't have any dbufs in the range 170 * being freed. This is always true because there is a one-record 171 * constraint: we only send one WRITE record for any given 172 * object,offset. We know that the one-record constraint is 173 * true because we always send data in increasing order by 174 * object,offset. 175 * 176 * If the increasing-order constraint ever changes, we should find 177 * another way to assert that the one-record constraint is still 178 * satisfied. 179 */ 180 ASSERT(object > dsp->dsa_last_data_object || 181 (object == dsp->dsa_last_data_object && 182 offset > dsp->dsa_last_data_offset)); 183 184 /* 185 * If we are doing a non-incremental send, then there can't 186 * be any data in the dataset we're receiving into. Therefore 187 * a free record would simply be a no-op. Save space by not 188 * sending it to begin with. 189 */ 190 if (!dsp->dsa_incremental) 191 return (0); 192 193 if (length != -1ULL && offset + length < offset) 194 length = -1ULL; 195 196 /* 197 * If there is a pending op, but it's not PENDING_FREE, push it out, 198 * since free block aggregation can only be done for blocks of the 199 * same type (i.e., DRR_FREE records can only be aggregated with 200 * other DRR_FREE records. DRR_FREEOBJECTS records can only be 201 * aggregated with other DRR_FREEOBJECTS records. 202 */ 203 if (dsp->dsa_pending_op != PENDING_NONE && 204 dsp->dsa_pending_op != PENDING_FREE) { 205 if (dump_record(dsp, NULL, 0) != 0) 206 return (SET_ERROR(EINTR)); 207 dsp->dsa_pending_op = PENDING_NONE; 208 } 209 210 if (dsp->dsa_pending_op == PENDING_FREE) { 211 /* 212 * There should never be a PENDING_FREE if length is -1 213 * (because dump_dnode is the only place where this 214 * function is called with a -1, and only after flushing 215 * any pending record). 216 */ 217 ASSERT(length != -1ULL); 218 /* 219 * Check to see whether this free block can be aggregated 220 * with pending one. 221 */ 222 if (drrf->drr_object == object && drrf->drr_offset + 223 drrf->drr_length == offset) { 224 drrf->drr_length += length; 225 return (0); 226 } else { 227 /* not a continuation. Push out pending record */ 228 if (dump_record(dsp, NULL, 0) != 0) 229 return (SET_ERROR(EINTR)); 230 dsp->dsa_pending_op = PENDING_NONE; 231 } 232 } 233 /* create a FREE record and make it pending */ 234 bzero(dsp->dsa_drr, sizeof (dmu_replay_record_t)); 235 dsp->dsa_drr->drr_type = DRR_FREE; 236 drrf->drr_object = object; 237 drrf->drr_offset = offset; 238 drrf->drr_length = length; 239 drrf->drr_toguid = dsp->dsa_toguid; 240 if (length == -1ULL) { 241 if (dump_record(dsp, NULL, 0) != 0) 242 return (SET_ERROR(EINTR)); 243 } else { 244 dsp->dsa_pending_op = PENDING_FREE; 245 } 246 247 return (0); 248} 249 250static int 251dump_write(dmu_sendarg_t *dsp, dmu_object_type_t type, 252 uint64_t object, uint64_t offset, int blksz, const blkptr_t *bp, void *data) 253{ 254 struct drr_write *drrw = &(dsp->dsa_drr->drr_u.drr_write); 255 256 /* 257 * We send data in increasing object, offset order. 258 * See comment in dump_free() for details. 259 */ 260 ASSERT(object > dsp->dsa_last_data_object || 261 (object == dsp->dsa_last_data_object && 262 offset > dsp->dsa_last_data_offset)); 263 dsp->dsa_last_data_object = object; 264 dsp->dsa_last_data_offset = offset + blksz - 1; 265 266 /* 267 * If there is any kind of pending aggregation (currently either 268 * a grouping of free objects or free blocks), push it out to 269 * the stream, since aggregation can't be done across operations 270 * of different types. 271 */ 272 if (dsp->dsa_pending_op != PENDING_NONE) { 273 if (dump_record(dsp, NULL, 0) != 0) 274 return (SET_ERROR(EINTR)); 275 dsp->dsa_pending_op = PENDING_NONE; 276 } 277 /* write a WRITE record */ 278 bzero(dsp->dsa_drr, sizeof (dmu_replay_record_t)); 279 dsp->dsa_drr->drr_type = DRR_WRITE; 280 drrw->drr_object = object; 281 drrw->drr_type = type; 282 drrw->drr_offset = offset; 283 drrw->drr_length = blksz; 284 drrw->drr_toguid = dsp->dsa_toguid; 285 if (bp == NULL || BP_IS_EMBEDDED(bp)) { 286 /* 287 * There's no pre-computed checksum for partial-block 288 * writes or embedded BP's, so (like 289 * fletcher4-checkummed blocks) userland will have to 290 * compute a dedup-capable checksum itself. 291 */ 292 drrw->drr_checksumtype = ZIO_CHECKSUM_OFF; 293 } else { 294 drrw->drr_checksumtype = BP_GET_CHECKSUM(bp); 295 if (zio_checksum_table[drrw->drr_checksumtype].ci_dedup) 296 drrw->drr_checksumflags |= DRR_CHECKSUM_DEDUP; 297 DDK_SET_LSIZE(&drrw->drr_key, BP_GET_LSIZE(bp)); 298 DDK_SET_PSIZE(&drrw->drr_key, BP_GET_PSIZE(bp)); 299 DDK_SET_COMPRESS(&drrw->drr_key, BP_GET_COMPRESS(bp)); 300 drrw->drr_key.ddk_cksum = bp->blk_cksum; 301 } 302 303 if (dump_record(dsp, data, blksz) != 0) 304 return (SET_ERROR(EINTR)); 305 return (0); 306} 307 308static int 309dump_write_embedded(dmu_sendarg_t *dsp, uint64_t object, uint64_t offset, 310 int blksz, const blkptr_t *bp) 311{ 312 char buf[BPE_PAYLOAD_SIZE]; 313 struct drr_write_embedded *drrw = 314 &(dsp->dsa_drr->drr_u.drr_write_embedded); 315 316 if (dsp->dsa_pending_op != PENDING_NONE) { 317 if (dump_record(dsp, NULL, 0) != 0) 318 return (EINTR); 319 dsp->dsa_pending_op = PENDING_NONE; 320 } 321 322 ASSERT(BP_IS_EMBEDDED(bp)); 323 324 bzero(dsp->dsa_drr, sizeof (dmu_replay_record_t)); 325 dsp->dsa_drr->drr_type = DRR_WRITE_EMBEDDED; 326 drrw->drr_object = object; 327 drrw->drr_offset = offset; 328 drrw->drr_length = blksz; 329 drrw->drr_toguid = dsp->dsa_toguid; 330 drrw->drr_compression = BP_GET_COMPRESS(bp); 331 drrw->drr_etype = BPE_GET_ETYPE(bp); 332 drrw->drr_lsize = BPE_GET_LSIZE(bp); 333 drrw->drr_psize = BPE_GET_PSIZE(bp); 334 335 decode_embedded_bp_compressed(bp, buf); 336 337 if (dump_record(dsp, buf, P2ROUNDUP(drrw->drr_psize, 8)) != 0) 338 return (EINTR); 339 return (0); 340} 341 342static int 343dump_spill(dmu_sendarg_t *dsp, uint64_t object, int blksz, void *data) 344{ 345 struct drr_spill *drrs = &(dsp->dsa_drr->drr_u.drr_spill); 346 347 if (dsp->dsa_pending_op != PENDING_NONE) { 348 if (dump_record(dsp, NULL, 0) != 0) 349 return (SET_ERROR(EINTR)); 350 dsp->dsa_pending_op = PENDING_NONE; 351 } 352 353 /* write a SPILL record */ 354 bzero(dsp->dsa_drr, sizeof (dmu_replay_record_t)); 355 dsp->dsa_drr->drr_type = DRR_SPILL; 356 drrs->drr_object = object; 357 drrs->drr_length = blksz; 358 drrs->drr_toguid = dsp->dsa_toguid; 359 360 if (dump_record(dsp, data, blksz) != 0) 361 return (SET_ERROR(EINTR)); 362 return (0); 363} 364 365static int 366dump_freeobjects(dmu_sendarg_t *dsp, uint64_t firstobj, uint64_t numobjs) 367{ 368 struct drr_freeobjects *drrfo = &(dsp->dsa_drr->drr_u.drr_freeobjects); 369 370 /* See comment in dump_free(). */ 371 if (!dsp->dsa_incremental) 372 return (0); 373 374 /* 375 * If there is a pending op, but it's not PENDING_FREEOBJECTS, 376 * push it out, since free block aggregation can only be done for 377 * blocks of the same type (i.e., DRR_FREE records can only be 378 * aggregated with other DRR_FREE records. DRR_FREEOBJECTS records 379 * can only be aggregated with other DRR_FREEOBJECTS records. 380 */ 381 if (dsp->dsa_pending_op != PENDING_NONE && 382 dsp->dsa_pending_op != PENDING_FREEOBJECTS) { 383 if (dump_record(dsp, NULL, 0) != 0) 384 return (SET_ERROR(EINTR)); 385 dsp->dsa_pending_op = PENDING_NONE; 386 } 387 if (dsp->dsa_pending_op == PENDING_FREEOBJECTS) { 388 /* 389 * See whether this free object array can be aggregated 390 * with pending one 391 */ 392 if (drrfo->drr_firstobj + drrfo->drr_numobjs == firstobj) { 393 drrfo->drr_numobjs += numobjs; 394 return (0); 395 } else { 396 /* can't be aggregated. Push out pending record */ 397 if (dump_record(dsp, NULL, 0) != 0) 398 return (SET_ERROR(EINTR)); 399 dsp->dsa_pending_op = PENDING_NONE; 400 } 401 } 402 403 /* write a FREEOBJECTS record */ 404 bzero(dsp->dsa_drr, sizeof (dmu_replay_record_t)); 405 dsp->dsa_drr->drr_type = DRR_FREEOBJECTS; 406 drrfo->drr_firstobj = firstobj; 407 drrfo->drr_numobjs = numobjs; 408 drrfo->drr_toguid = dsp->dsa_toguid; 409 410 dsp->dsa_pending_op = PENDING_FREEOBJECTS; 411 412 return (0); 413} 414 415static int 416dump_dnode(dmu_sendarg_t *dsp, uint64_t object, dnode_phys_t *dnp) 417{ 418 struct drr_object *drro = &(dsp->dsa_drr->drr_u.drr_object); 419 420 if (object < dsp->dsa_resume_object) { 421 /* 422 * Note: when resuming, we will visit all the dnodes in 423 * the block of dnodes that we are resuming from. In 424 * this case it's unnecessary to send the dnodes prior to 425 * the one we are resuming from. We should be at most one 426 * block's worth of dnodes behind the resume point. 427 */ 428 ASSERT3U(dsp->dsa_resume_object - object, <, 429 1 << (DNODE_BLOCK_SHIFT - DNODE_SHIFT)); 430 return (0); 431 } 432 433 if (dnp == NULL || dnp->dn_type == DMU_OT_NONE) 434 return (dump_freeobjects(dsp, object, 1)); 435 436 if (dsp->dsa_pending_op != PENDING_NONE) { 437 if (dump_record(dsp, NULL, 0) != 0) 438 return (SET_ERROR(EINTR)); 439 dsp->dsa_pending_op = PENDING_NONE; 440 } 441 442 /* write an OBJECT record */ 443 bzero(dsp->dsa_drr, sizeof (dmu_replay_record_t)); 444 dsp->dsa_drr->drr_type = DRR_OBJECT; 445 drro->drr_object = object; 446 drro->drr_type = dnp->dn_type; 447 drro->drr_bonustype = dnp->dn_bonustype; 448 drro->drr_blksz = dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT; 449 drro->drr_bonuslen = dnp->dn_bonuslen; 450 drro->drr_checksumtype = dnp->dn_checksum; 451 drro->drr_compress = dnp->dn_compress; 452 drro->drr_toguid = dsp->dsa_toguid; 453 454 if (!(dsp->dsa_featureflags & DMU_BACKUP_FEATURE_LARGE_BLOCKS) && 455 drro->drr_blksz > SPA_OLD_MAXBLOCKSIZE) 456 drro->drr_blksz = SPA_OLD_MAXBLOCKSIZE; 457 458 if (dump_record(dsp, DN_BONUS(dnp), 459 P2ROUNDUP(dnp->dn_bonuslen, 8)) != 0) { 460 return (SET_ERROR(EINTR)); 461 } 462 463 /* Free anything past the end of the file. */ 464 if (dump_free(dsp, object, (dnp->dn_maxblkid + 1) * 465 (dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT), -1ULL) != 0) 466 return (SET_ERROR(EINTR)); 467 if (dsp->dsa_err != 0) 468 return (SET_ERROR(EINTR)); 469 return (0); 470} 471 472static boolean_t 473backup_do_embed(dmu_sendarg_t *dsp, const blkptr_t *bp) 474{ 475 if (!BP_IS_EMBEDDED(bp)) 476 return (B_FALSE); 477 478 /* 479 * Compression function must be legacy, or explicitly enabled. 480 */ 481 if ((BP_GET_COMPRESS(bp) >= ZIO_COMPRESS_LEGACY_FUNCTIONS && 482 !(dsp->dsa_featureflags & DMU_BACKUP_FEATURE_EMBED_DATA_LZ4))) 483 return (B_FALSE); 484 485 /* 486 * Embed type must be explicitly enabled. 487 */ 488 switch (BPE_GET_ETYPE(bp)) { 489 case BP_EMBEDDED_TYPE_DATA: 490 if (dsp->dsa_featureflags & DMU_BACKUP_FEATURE_EMBED_DATA) 491 return (B_TRUE); 492 break; 493 default: 494 return (B_FALSE); 495 } 496 return (B_FALSE); 497} 498 499/* 500 * This is the callback function to traverse_dataset that acts as the worker 501 * thread for dmu_send_impl. 502 */ 503/*ARGSUSED*/ 504static int 505send_cb(spa_t *spa, zilog_t *zilog, const blkptr_t *bp, 506 const zbookmark_phys_t *zb, const struct dnode_phys *dnp, void *arg) 507{ 508 struct send_thread_arg *sta = arg; 509 struct send_block_record *record; 510 uint64_t record_size; 511 int err = 0; 512 513 ASSERT(zb->zb_object == DMU_META_DNODE_OBJECT || 514 zb->zb_object >= sta->resume.zb_object); 515 516 if (sta->cancel) 517 return (SET_ERROR(EINTR)); 518 519 if (bp == NULL) { 520 ASSERT3U(zb->zb_level, ==, ZB_DNODE_LEVEL); 521 return (0); 522 } else if (zb->zb_level < 0) { 523 return (0); 524 } 525 526 record = kmem_zalloc(sizeof (struct send_block_record), KM_SLEEP); 527 record->eos_marker = B_FALSE; 528 record->bp = *bp; 529 record->zb = *zb; 530 record->indblkshift = dnp->dn_indblkshift; 531 record->datablkszsec = dnp->dn_datablkszsec; 532 record_size = dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT; 533 bqueue_enqueue(&sta->q, record, record_size); 534 535 return (err); 536} 537 538/* 539 * This function kicks off the traverse_dataset. It also handles setting the 540 * error code of the thread in case something goes wrong, and pushes the End of 541 * Stream record when the traverse_dataset call has finished. If there is no 542 * dataset to traverse, the thread immediately pushes End of Stream marker. 543 */ 544static void 545send_traverse_thread(void *arg) 546{ 547 struct send_thread_arg *st_arg = arg; 548 int err; 549 struct send_block_record *data; 550 551 if (st_arg->ds != NULL) { 552 err = traverse_dataset_resume(st_arg->ds, 553 st_arg->fromtxg, &st_arg->resume, 554 st_arg->flags, send_cb, st_arg); 555 556 if (err != EINTR) 557 st_arg->error_code = err; 558 } 559 data = kmem_zalloc(sizeof (*data), KM_SLEEP); 560 data->eos_marker = B_TRUE; 561 bqueue_enqueue(&st_arg->q, data, 1); 562 thread_exit(); 563} 564 565/* 566 * This function actually handles figuring out what kind of record needs to be 567 * dumped, reading the data (which has hopefully been prefetched), and calling 568 * the appropriate helper function. 569 */ 570static int 571do_dump(dmu_sendarg_t *dsa, struct send_block_record *data) 572{ 573 dsl_dataset_t *ds = dmu_objset_ds(dsa->dsa_os); 574 const blkptr_t *bp = &data->bp; 575 const zbookmark_phys_t *zb = &data->zb; 576 uint8_t indblkshift = data->indblkshift; 577 uint16_t dblkszsec = data->datablkszsec; 578 spa_t *spa = ds->ds_dir->dd_pool->dp_spa; 579 dmu_object_type_t type = bp ? BP_GET_TYPE(bp) : DMU_OT_NONE; 580 int err = 0; 581 582 ASSERT3U(zb->zb_level, >=, 0); 583 584 ASSERT(zb->zb_object == DMU_META_DNODE_OBJECT || 585 zb->zb_object >= dsa->dsa_resume_object); 586 587 if (zb->zb_object != DMU_META_DNODE_OBJECT && 588 DMU_OBJECT_IS_SPECIAL(zb->zb_object)) { 589 return (0); 590 } else if (BP_IS_HOLE(bp) && 591 zb->zb_object == DMU_META_DNODE_OBJECT) { 592 uint64_t span = BP_SPAN(dblkszsec, indblkshift, zb->zb_level); 593 uint64_t dnobj = (zb->zb_blkid * span) >> DNODE_SHIFT; 594 err = dump_freeobjects(dsa, dnobj, span >> DNODE_SHIFT); 595 } else if (BP_IS_HOLE(bp)) { 596 uint64_t span = BP_SPAN(dblkszsec, indblkshift, zb->zb_level); 597 uint64_t offset = zb->zb_blkid * span; 598 err = dump_free(dsa, zb->zb_object, offset, span); 599 } else if (zb->zb_level > 0 || type == DMU_OT_OBJSET) { 600 return (0); 601 } else if (type == DMU_OT_DNODE) { 602 int blksz = BP_GET_LSIZE(bp); 603 arc_flags_t aflags = ARC_FLAG_WAIT; 604 arc_buf_t *abuf; 605 606 ASSERT0(zb->zb_level); 607 608 if (arc_read(NULL, spa, bp, arc_getbuf_func, &abuf, 609 ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, 610 &aflags, zb) != 0) 611 return (SET_ERROR(EIO)); 612 613 dnode_phys_t *blk = abuf->b_data; 614 uint64_t dnobj = zb->zb_blkid * (blksz >> DNODE_SHIFT); 615 for (int i = 0; i < blksz >> DNODE_SHIFT; i++) { 616 err = dump_dnode(dsa, dnobj + i, blk + i); 617 if (err != 0) 618 break; 619 } 620 (void) arc_buf_remove_ref(abuf, &abuf); 621 } else if (type == DMU_OT_SA) { 622 arc_flags_t aflags = ARC_FLAG_WAIT; 623 arc_buf_t *abuf; 624 int blksz = BP_GET_LSIZE(bp); 625 626 if (arc_read(NULL, spa, bp, arc_getbuf_func, &abuf, 627 ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, 628 &aflags, zb) != 0) 629 return (SET_ERROR(EIO)); 630 631 err = dump_spill(dsa, zb->zb_object, blksz, abuf->b_data); 632 (void) arc_buf_remove_ref(abuf, &abuf); 633 } else if (backup_do_embed(dsa, bp)) { 634 /* it's an embedded level-0 block of a regular object */ 635 int blksz = dblkszsec << SPA_MINBLOCKSHIFT; 636 ASSERT0(zb->zb_level); 637 err = dump_write_embedded(dsa, zb->zb_object, 638 zb->zb_blkid * blksz, blksz, bp); 639 } else { 640 /* it's a level-0 block of a regular object */ 641 arc_flags_t aflags = ARC_FLAG_WAIT; 642 arc_buf_t *abuf; 643 int blksz = dblkszsec << SPA_MINBLOCKSHIFT; 644 uint64_t offset; 645 646 ASSERT0(zb->zb_level); 647 ASSERT(zb->zb_object > dsa->dsa_resume_object || 648 (zb->zb_object == dsa->dsa_resume_object && 649 zb->zb_blkid * blksz >= dsa->dsa_resume_offset)); 650 651 if (arc_read(NULL, spa, bp, arc_getbuf_func, &abuf, 652 ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, 653 &aflags, zb) != 0) { 654 if (zfs_send_corrupt_data) { 655 /* Send a block filled with 0x"zfs badd bloc" */ 656 abuf = arc_buf_alloc(spa, blksz, &abuf, 657 ARC_BUFC_DATA); 658 uint64_t *ptr; 659 for (ptr = abuf->b_data; 660 (char *)ptr < (char *)abuf->b_data + blksz; 661 ptr++) 662 *ptr = 0x2f5baddb10cULL; 663 } else { 664 return (SET_ERROR(EIO)); 665 } 666 } 667 668 offset = zb->zb_blkid * blksz; 669 670 if (!(dsa->dsa_featureflags & 671 DMU_BACKUP_FEATURE_LARGE_BLOCKS) && 672 blksz > SPA_OLD_MAXBLOCKSIZE) { 673 char *buf = abuf->b_data; 674 while (blksz > 0 && err == 0) { 675 int n = MIN(blksz, SPA_OLD_MAXBLOCKSIZE); 676 err = dump_write(dsa, type, zb->zb_object, 677 offset, n, NULL, buf); 678 offset += n; 679 buf += n; 680 blksz -= n; 681 } 682 } else { 683 err = dump_write(dsa, type, zb->zb_object, 684 offset, blksz, bp, abuf->b_data); 685 } 686 (void) arc_buf_remove_ref(abuf, &abuf); 687 } 688 689 ASSERT(err == 0 || err == EINTR); 690 return (err); 691} 692 693/* 694 * Pop the new data off the queue, and free the old data. 695 */ 696static struct send_block_record * 697get_next_record(bqueue_t *bq, struct send_block_record *data) 698{ 699 struct send_block_record *tmp = bqueue_dequeue(bq); 700 kmem_free(data, sizeof (*data)); 701 return (tmp); 702} 703 704/* 705 * Actually do the bulk of the work in a zfs send. 706 * 707 * Note: Releases dp using the specified tag. 708 */ 709static int 710dmu_send_impl(void *tag, dsl_pool_t *dp, dsl_dataset_t *to_ds, 711 zfs_bookmark_phys_t *ancestor_zb, 712 boolean_t is_clone, boolean_t embedok, boolean_t large_block_ok, int outfd, 713 uint64_t resumeobj, uint64_t resumeoff, 714#ifdef illumos 715 vnode_t *vp, offset_t *off) 716#else 717 struct file *fp, offset_t *off) 718#endif 719{ 720 objset_t *os; 721 dmu_replay_record_t *drr; 722 dmu_sendarg_t *dsp; 723 int err; 724 uint64_t fromtxg = 0; 725 uint64_t featureflags = 0; 726 struct send_thread_arg to_arg = { 0 }; 727 728 err = dmu_objset_from_ds(to_ds, &os); 729 if (err != 0) { 730 dsl_pool_rele(dp, tag); 731 return (err); 732 } 733 734 drr = kmem_zalloc(sizeof (dmu_replay_record_t), KM_SLEEP); 735 drr->drr_type = DRR_BEGIN; 736 drr->drr_u.drr_begin.drr_magic = DMU_BACKUP_MAGIC; 737 DMU_SET_STREAM_HDRTYPE(drr->drr_u.drr_begin.drr_versioninfo, 738 DMU_SUBSTREAM); 739 740#ifdef _KERNEL 741 if (dmu_objset_type(os) == DMU_OST_ZFS) { 742 uint64_t version; 743 if (zfs_get_zplprop(os, ZFS_PROP_VERSION, &version) != 0) { 744 kmem_free(drr, sizeof (dmu_replay_record_t)); 745 dsl_pool_rele(dp, tag); 746 return (SET_ERROR(EINVAL)); 747 } 748 if (version >= ZPL_VERSION_SA) { 749 featureflags |= DMU_BACKUP_FEATURE_SA_SPILL; 750 } 751 } 752#endif 753 754 if (large_block_ok && to_ds->ds_feature_inuse[SPA_FEATURE_LARGE_BLOCKS]) 755 featureflags |= DMU_BACKUP_FEATURE_LARGE_BLOCKS; 756 if (embedok && 757 spa_feature_is_active(dp->dp_spa, SPA_FEATURE_EMBEDDED_DATA)) { 758 featureflags |= DMU_BACKUP_FEATURE_EMBED_DATA; 759 if (spa_feature_is_active(dp->dp_spa, SPA_FEATURE_LZ4_COMPRESS)) 760 featureflags |= DMU_BACKUP_FEATURE_EMBED_DATA_LZ4; 761 } 762 763 if (resumeobj != 0 || resumeoff != 0) { 764 featureflags |= DMU_BACKUP_FEATURE_RESUMING; 765 } 766 767 DMU_SET_FEATUREFLAGS(drr->drr_u.drr_begin.drr_versioninfo, 768 featureflags); 769 770 drr->drr_u.drr_begin.drr_creation_time = 771 dsl_dataset_phys(to_ds)->ds_creation_time; 772 drr->drr_u.drr_begin.drr_type = dmu_objset_type(os); 773 if (is_clone) 774 drr->drr_u.drr_begin.drr_flags |= DRR_FLAG_CLONE; 775 drr->drr_u.drr_begin.drr_toguid = dsl_dataset_phys(to_ds)->ds_guid; 776 if (dsl_dataset_phys(to_ds)->ds_flags & DS_FLAG_CI_DATASET) 777 drr->drr_u.drr_begin.drr_flags |= DRR_FLAG_CI_DATA; 778 779 if (ancestor_zb != NULL) { 780 drr->drr_u.drr_begin.drr_fromguid = 781 ancestor_zb->zbm_guid; 782 fromtxg = ancestor_zb->zbm_creation_txg; 783 } 784 dsl_dataset_name(to_ds, drr->drr_u.drr_begin.drr_toname); 785 if (!to_ds->ds_is_snapshot) { 786 (void) strlcat(drr->drr_u.drr_begin.drr_toname, "@--head--", 787 sizeof (drr->drr_u.drr_begin.drr_toname)); 788 } 789 790 dsp = kmem_zalloc(sizeof (dmu_sendarg_t), KM_SLEEP); 791 792 dsp->dsa_drr = drr; 793 dsp->dsa_outfd = outfd; 794 dsp->dsa_proc = curproc; 795 dsp->dsa_td = curthread; 796 dsp->dsa_fp = fp; 797 dsp->dsa_os = os; 798 dsp->dsa_off = off; 799 dsp->dsa_toguid = dsl_dataset_phys(to_ds)->ds_guid; 800 dsp->dsa_pending_op = PENDING_NONE; 801 dsp->dsa_incremental = (ancestor_zb != NULL); 802 dsp->dsa_featureflags = featureflags; 803 dsp->dsa_resume_object = resumeobj; 804 dsp->dsa_resume_offset = resumeoff; 805 806 mutex_enter(&to_ds->ds_sendstream_lock); 807 list_insert_head(&to_ds->ds_sendstreams, dsp); 808 mutex_exit(&to_ds->ds_sendstream_lock); 809 810 dsl_dataset_long_hold(to_ds, FTAG); 811 dsl_pool_rele(dp, tag); 812 813 void *payload = NULL; 814 size_t payload_len = 0; 815 if (resumeobj != 0 || resumeoff != 0) { 816 dmu_object_info_t to_doi; 817 err = dmu_object_info(os, resumeobj, &to_doi); 818 if (err != 0) 819 goto out; 820 SET_BOOKMARK(&to_arg.resume, to_ds->ds_object, resumeobj, 0, 821 resumeoff / to_doi.doi_data_block_size); 822 823 nvlist_t *nvl = fnvlist_alloc(); 824 fnvlist_add_uint64(nvl, "resume_object", resumeobj); 825 fnvlist_add_uint64(nvl, "resume_offset", resumeoff); 826 payload = fnvlist_pack(nvl, &payload_len); 827 drr->drr_payloadlen = payload_len; 828 fnvlist_free(nvl); 829 } 830 831 err = dump_record(dsp, payload, payload_len); 832 fnvlist_pack_free(payload, payload_len); 833 if (err != 0) { 834 err = dsp->dsa_err; 835 goto out; 836 } 837 838 err = bqueue_init(&to_arg.q, zfs_send_queue_length, 839 offsetof(struct send_block_record, ln)); 840 to_arg.error_code = 0; 841 to_arg.cancel = B_FALSE; 842 to_arg.ds = to_ds; 843 to_arg.fromtxg = fromtxg; 844 to_arg.flags = TRAVERSE_PRE | TRAVERSE_PREFETCH; 845 (void) thread_create(NULL, 0, send_traverse_thread, &to_arg, 0, &p0, 846 TS_RUN, minclsyspri); 847 848 struct send_block_record *to_data; 849 to_data = bqueue_dequeue(&to_arg.q); 850 851 while (!to_data->eos_marker && err == 0) { 852 err = do_dump(dsp, to_data); 853 to_data = get_next_record(&to_arg.q, to_data); 854 if (issig(JUSTLOOKING) && issig(FORREAL)) 855 err = EINTR; 856 } 857 858 if (err != 0) { 859 to_arg.cancel = B_TRUE; 860 while (!to_data->eos_marker) { 861 to_data = get_next_record(&to_arg.q, to_data); 862 } 863 } 864 kmem_free(to_data, sizeof (*to_data)); 865 866 bqueue_destroy(&to_arg.q); 867 868 if (err == 0 && to_arg.error_code != 0) 869 err = to_arg.error_code; 870 871 if (err != 0) 872 goto out; 873 874 if (dsp->dsa_pending_op != PENDING_NONE) 875 if (dump_record(dsp, NULL, 0) != 0) 876 err = SET_ERROR(EINTR); 877 878 if (err != 0) { 879 if (err == EINTR && dsp->dsa_err != 0) 880 err = dsp->dsa_err; 881 goto out; 882 } 883 884 bzero(drr, sizeof (dmu_replay_record_t)); 885 drr->drr_type = DRR_END; 886 drr->drr_u.drr_end.drr_checksum = dsp->dsa_zc; 887 drr->drr_u.drr_end.drr_toguid = dsp->dsa_toguid; 888 889 if (dump_record(dsp, NULL, 0) != 0) 890 err = dsp->dsa_err; 891 892out: 893 mutex_enter(&to_ds->ds_sendstream_lock); 894 list_remove(&to_ds->ds_sendstreams, dsp); 895 mutex_exit(&to_ds->ds_sendstream_lock); 896 897 kmem_free(drr, sizeof (dmu_replay_record_t)); 898 kmem_free(dsp, sizeof (dmu_sendarg_t)); 899 900 dsl_dataset_long_rele(to_ds, FTAG); 901 902 return (err); 903} 904 905int 906dmu_send_obj(const char *pool, uint64_t tosnap, uint64_t fromsnap, 907 boolean_t embedok, boolean_t large_block_ok, 908#ifdef illumos 909 int outfd, vnode_t *vp, offset_t *off) 910#else 911 int outfd, struct file *fp, offset_t *off) 912#endif 913{ 914 dsl_pool_t *dp; 915 dsl_dataset_t *ds; 916 dsl_dataset_t *fromds = NULL; 917 int err; 918 919 err = dsl_pool_hold(pool, FTAG, &dp); 920 if (err != 0) 921 return (err); 922 923 err = dsl_dataset_hold_obj(dp, tosnap, FTAG, &ds); 924 if (err != 0) { 925 dsl_pool_rele(dp, FTAG); 926 return (err); 927 } 928 929 if (fromsnap != 0) { 930 zfs_bookmark_phys_t zb; 931 boolean_t is_clone; 932 933 err = dsl_dataset_hold_obj(dp, fromsnap, FTAG, &fromds); 934 if (err != 0) { 935 dsl_dataset_rele(ds, FTAG); 936 dsl_pool_rele(dp, FTAG); 937 return (err); 938 } 939 if (!dsl_dataset_is_before(ds, fromds, 0)) 940 err = SET_ERROR(EXDEV); 941 zb.zbm_creation_time = 942 dsl_dataset_phys(fromds)->ds_creation_time; 943 zb.zbm_creation_txg = dsl_dataset_phys(fromds)->ds_creation_txg; 944 zb.zbm_guid = dsl_dataset_phys(fromds)->ds_guid; 945 is_clone = (fromds->ds_dir != ds->ds_dir); 946 dsl_dataset_rele(fromds, FTAG); 947 err = dmu_send_impl(FTAG, dp, ds, &zb, is_clone, 948 embedok, large_block_ok, outfd, 0, 0, fp, off); 949 } else { 950 err = dmu_send_impl(FTAG, dp, ds, NULL, B_FALSE, 951 embedok, large_block_ok, outfd, 0, 0, fp, off); 952 } 953 dsl_dataset_rele(ds, FTAG); 954 return (err); 955} 956 957int 958dmu_send(const char *tosnap, const char *fromsnap, boolean_t embedok, 959 boolean_t large_block_ok, int outfd, uint64_t resumeobj, uint64_t resumeoff, 960#ifdef illumos 961 vnode_t *vp, offset_t *off) 962#else 963 struct file *fp, offset_t *off) 964#endif 965{ 966 dsl_pool_t *dp; 967 dsl_dataset_t *ds; 968 int err; 969 boolean_t owned = B_FALSE; 970 971 if (fromsnap != NULL && strpbrk(fromsnap, "@#") == NULL) 972 return (SET_ERROR(EINVAL)); 973 974 err = dsl_pool_hold(tosnap, FTAG, &dp); 975 if (err != 0) 976 return (err); 977 978 if (strchr(tosnap, '@') == NULL && spa_writeable(dp->dp_spa)) { 979 /* 980 * We are sending a filesystem or volume. Ensure 981 * that it doesn't change by owning the dataset. 982 */ 983 err = dsl_dataset_own(dp, tosnap, FTAG, &ds); 984 owned = B_TRUE; 985 } else { 986 err = dsl_dataset_hold(dp, tosnap, FTAG, &ds); 987 } 988 if (err != 0) { 989 dsl_pool_rele(dp, FTAG); 990 return (err); 991 } 992 993 if (fromsnap != NULL) { 994 zfs_bookmark_phys_t zb; 995 boolean_t is_clone = B_FALSE; 996 int fsnamelen = strchr(tosnap, '@') - tosnap; 997 998 /* 999 * If the fromsnap is in a different filesystem, then 1000 * mark the send stream as a clone. 1001 */ 1002 if (strncmp(tosnap, fromsnap, fsnamelen) != 0 || 1003 (fromsnap[fsnamelen] != '@' && 1004 fromsnap[fsnamelen] != '#')) { 1005 is_clone = B_TRUE; 1006 } 1007 1008 if (strchr(fromsnap, '@')) { 1009 dsl_dataset_t *fromds; 1010 err = dsl_dataset_hold(dp, fromsnap, FTAG, &fromds); 1011 if (err == 0) { 1012 if (!dsl_dataset_is_before(ds, fromds, 0)) 1013 err = SET_ERROR(EXDEV); 1014 zb.zbm_creation_time = 1015 dsl_dataset_phys(fromds)->ds_creation_time; 1016 zb.zbm_creation_txg = 1017 dsl_dataset_phys(fromds)->ds_creation_txg; 1018 zb.zbm_guid = dsl_dataset_phys(fromds)->ds_guid; 1019 is_clone = (ds->ds_dir != fromds->ds_dir); 1020 dsl_dataset_rele(fromds, FTAG); 1021 } 1022 } else { 1023 err = dsl_bookmark_lookup(dp, fromsnap, ds, &zb); 1024 } 1025 if (err != 0) { 1026 dsl_dataset_rele(ds, FTAG); 1027 dsl_pool_rele(dp, FTAG); 1028 return (err); 1029 } 1030 err = dmu_send_impl(FTAG, dp, ds, &zb, is_clone, 1031 embedok, large_block_ok, 1032 outfd, resumeobj, resumeoff, fp, off); 1033 } else { 1034 err = dmu_send_impl(FTAG, dp, ds, NULL, B_FALSE, 1035 embedok, large_block_ok, 1036 outfd, resumeobj, resumeoff, fp, off); 1037 } 1038 if (owned) 1039 dsl_dataset_disown(ds, FTAG); 1040 else 1041 dsl_dataset_rele(ds, FTAG); 1042 return (err); 1043} 1044 1045static int 1046dmu_adjust_send_estimate_for_indirects(dsl_dataset_t *ds, uint64_t size, 1047 uint64_t *sizep) 1048{ 1049 int err; 1050 /* 1051 * Assume that space (both on-disk and in-stream) is dominated by 1052 * data. We will adjust for indirect blocks and the copies property, 1053 * but ignore per-object space used (eg, dnodes and DRR_OBJECT records). 1054 */ 1055 1056 /* 1057 * Subtract out approximate space used by indirect blocks. 1058 * Assume most space is used by data blocks (non-indirect, non-dnode). 1059 * Assume all blocks are recordsize. Assume ditto blocks and 1060 * internal fragmentation counter out compression. 1061 * 1062 * Therefore, space used by indirect blocks is sizeof(blkptr_t) per 1063 * block, which we observe in practice. 1064 */ 1065 uint64_t recordsize; 1066 err = dsl_prop_get_int_ds(ds, "recordsize", &recordsize); 1067 if (err != 0) 1068 return (err); 1069 size -= size / recordsize * sizeof (blkptr_t); 1070 1071 /* Add in the space for the record associated with each block. */ 1072 size += size / recordsize * sizeof (dmu_replay_record_t); 1073 1074 *sizep = size; 1075 1076 return (0); 1077} 1078 1079int 1080dmu_send_estimate(dsl_dataset_t *ds, dsl_dataset_t *fromds, uint64_t *sizep) 1081{ 1082 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1083 int err; 1084 uint64_t size; 1085 1086 ASSERT(dsl_pool_config_held(dp)); 1087 1088 /* tosnap must be a snapshot */ 1089 if (!ds->ds_is_snapshot) 1090 return (SET_ERROR(EINVAL)); 1091 1092 /* fromsnap, if provided, must be a snapshot */ 1093 if (fromds != NULL && !fromds->ds_is_snapshot) 1094 return (SET_ERROR(EINVAL)); 1095 1096 /* 1097 * fromsnap must be an earlier snapshot from the same fs as tosnap, 1098 * or the origin's fs. 1099 */ 1100 if (fromds != NULL && !dsl_dataset_is_before(ds, fromds, 0)) 1101 return (SET_ERROR(EXDEV)); 1102 1103 /* Get uncompressed size estimate of changed data. */ 1104 if (fromds == NULL) { 1105 size = dsl_dataset_phys(ds)->ds_uncompressed_bytes; 1106 } else { 1107 uint64_t used, comp; 1108 err = dsl_dataset_space_written(fromds, ds, 1109 &used, &comp, &size); 1110 if (err != 0) 1111 return (err); 1112 } 1113 1114 err = dmu_adjust_send_estimate_for_indirects(ds, size, sizep); 1115 return (err); 1116} 1117 1118/* 1119 * Simple callback used to traverse the blocks of a snapshot and sum their 1120 * uncompressed size 1121 */ 1122/* ARGSUSED */ 1123static int 1124dmu_calculate_send_traversal(spa_t *spa, zilog_t *zilog, const blkptr_t *bp, 1125 const zbookmark_phys_t *zb, const dnode_phys_t *dnp, void *arg) 1126{ 1127 uint64_t *spaceptr = arg; 1128 if (bp != NULL && !BP_IS_HOLE(bp)) { 1129 *spaceptr += BP_GET_UCSIZE(bp); 1130 } 1131 return (0); 1132} 1133 1134/* 1135 * Given a desination snapshot and a TXG, calculate the approximate size of a 1136 * send stream sent from that TXG. from_txg may be zero, indicating that the 1137 * whole snapshot will be sent. 1138 */ 1139int 1140dmu_send_estimate_from_txg(dsl_dataset_t *ds, uint64_t from_txg, 1141 uint64_t *sizep) 1142{ 1143 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1144 int err; 1145 uint64_t size = 0; 1146 1147 ASSERT(dsl_pool_config_held(dp)); 1148 1149 /* tosnap must be a snapshot */ 1150 if (!dsl_dataset_is_snapshot(ds)) 1151 return (SET_ERROR(EINVAL)); 1152 1153 /* verify that from_txg is before the provided snapshot was taken */ 1154 if (from_txg >= dsl_dataset_phys(ds)->ds_creation_txg) { 1155 return (SET_ERROR(EXDEV)); 1156 } 1157 1158 /* 1159 * traverse the blocks of the snapshot with birth times after 1160 * from_txg, summing their uncompressed size 1161 */ 1162 err = traverse_dataset(ds, from_txg, TRAVERSE_POST, 1163 dmu_calculate_send_traversal, &size); 1164 if (err) 1165 return (err); 1166 1167 err = dmu_adjust_send_estimate_for_indirects(ds, size, sizep); 1168 return (err); 1169} 1170 1171typedef struct dmu_recv_begin_arg { 1172 const char *drba_origin; 1173 dmu_recv_cookie_t *drba_cookie; 1174 cred_t *drba_cred; 1175 uint64_t drba_snapobj; 1176} dmu_recv_begin_arg_t; 1177 1178static int 1179recv_begin_check_existing_impl(dmu_recv_begin_arg_t *drba, dsl_dataset_t *ds, 1180 uint64_t fromguid) 1181{ 1182 uint64_t val; 1183 int error; 1184 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1185 1186 /* temporary clone name must not exist */ 1187 error = zap_lookup(dp->dp_meta_objset, 1188 dsl_dir_phys(ds->ds_dir)->dd_child_dir_zapobj, recv_clone_name, 1189 8, 1, &val); 1190 if (error != ENOENT) 1191 return (error == 0 ? EBUSY : error); 1192 1193 /* new snapshot name must not exist */ 1194 error = zap_lookup(dp->dp_meta_objset, 1195 dsl_dataset_phys(ds)->ds_snapnames_zapobj, 1196 drba->drba_cookie->drc_tosnap, 8, 1, &val); 1197 if (error != ENOENT) 1198 return (error == 0 ? EEXIST : error); 1199 1200 /* 1201 * Check snapshot limit before receiving. We'll recheck again at the 1202 * end, but might as well abort before receiving if we're already over 1203 * the limit. 1204 * 1205 * Note that we do not check the file system limit with 1206 * dsl_dir_fscount_check because the temporary %clones don't count 1207 * against that limit. 1208 */ 1209 error = dsl_fs_ss_limit_check(ds->ds_dir, 1, ZFS_PROP_SNAPSHOT_LIMIT, 1210 NULL, drba->drba_cred); 1211 if (error != 0) 1212 return (error); 1213 1214 if (fromguid != 0) { 1215 dsl_dataset_t *snap; 1216 uint64_t obj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 1217 1218 /* Find snapshot in this dir that matches fromguid. */ 1219 while (obj != 0) { 1220 error = dsl_dataset_hold_obj(dp, obj, FTAG, 1221 &snap); 1222 if (error != 0) 1223 return (SET_ERROR(ENODEV)); 1224 if (snap->ds_dir != ds->ds_dir) { 1225 dsl_dataset_rele(snap, FTAG); 1226 return (SET_ERROR(ENODEV)); 1227 } 1228 if (dsl_dataset_phys(snap)->ds_guid == fromguid) 1229 break; 1230 obj = dsl_dataset_phys(snap)->ds_prev_snap_obj; 1231 dsl_dataset_rele(snap, FTAG); 1232 } 1233 if (obj == 0) 1234 return (SET_ERROR(ENODEV)); 1235 1236 if (drba->drba_cookie->drc_force) { 1237 drba->drba_snapobj = obj; 1238 } else { 1239 /* 1240 * If we are not forcing, there must be no 1241 * changes since fromsnap. 1242 */ 1243 if (dsl_dataset_modified_since_snap(ds, snap)) { 1244 dsl_dataset_rele(snap, FTAG); 1245 return (SET_ERROR(ETXTBSY)); 1246 } 1247 drba->drba_snapobj = ds->ds_prev->ds_object; 1248 } 1249 1250 dsl_dataset_rele(snap, FTAG); 1251 } else { 1252 /* if full, then must be forced */ 1253 if (!drba->drba_cookie->drc_force) 1254 return (SET_ERROR(EEXIST)); 1255 /* start from $ORIGIN@$ORIGIN, if supported */ 1256 drba->drba_snapobj = dp->dp_origin_snap != NULL ? 1257 dp->dp_origin_snap->ds_object : 0; 1258 } 1259 1260 return (0); 1261 1262} 1263 1264static int 1265dmu_recv_begin_check(void *arg, dmu_tx_t *tx) 1266{ 1267 dmu_recv_begin_arg_t *drba = arg; 1268 dsl_pool_t *dp = dmu_tx_pool(tx); 1269 struct drr_begin *drrb = drba->drba_cookie->drc_drrb; 1270 uint64_t fromguid = drrb->drr_fromguid; 1271 int flags = drrb->drr_flags; 1272 int error; 1273 uint64_t featureflags = DMU_GET_FEATUREFLAGS(drrb->drr_versioninfo); 1274 dsl_dataset_t *ds; 1275 const char *tofs = drba->drba_cookie->drc_tofs; 1276 1277 /* already checked */ 1278 ASSERT3U(drrb->drr_magic, ==, DMU_BACKUP_MAGIC); 1279 ASSERT(!(featureflags & DMU_BACKUP_FEATURE_RESUMING)); 1280 1281 if (DMU_GET_STREAM_HDRTYPE(drrb->drr_versioninfo) == 1282 DMU_COMPOUNDSTREAM || 1283 drrb->drr_type >= DMU_OST_NUMTYPES || 1284 ((flags & DRR_FLAG_CLONE) && drba->drba_origin == NULL)) 1285 return (SET_ERROR(EINVAL)); 1286 1287 /* Verify pool version supports SA if SA_SPILL feature set */ 1288 if ((featureflags & DMU_BACKUP_FEATURE_SA_SPILL) && 1289 spa_version(dp->dp_spa) < SPA_VERSION_SA) 1290 return (SET_ERROR(ENOTSUP)); 1291 1292 if (drba->drba_cookie->drc_resumable && 1293 !spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_EXTENSIBLE_DATASET)) 1294 return (SET_ERROR(ENOTSUP)); 1295 1296 /* 1297 * The receiving code doesn't know how to translate a WRITE_EMBEDDED 1298 * record to a plan WRITE record, so the pool must have the 1299 * EMBEDDED_DATA feature enabled if the stream has WRITE_EMBEDDED 1300 * records. Same with WRITE_EMBEDDED records that use LZ4 compression. 1301 */ 1302 if ((featureflags & DMU_BACKUP_FEATURE_EMBED_DATA) && 1303 !spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_EMBEDDED_DATA)) 1304 return (SET_ERROR(ENOTSUP)); 1305 if ((featureflags & DMU_BACKUP_FEATURE_EMBED_DATA_LZ4) && 1306 !spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_LZ4_COMPRESS)) 1307 return (SET_ERROR(ENOTSUP)); 1308 1309 /* 1310 * The receiving code doesn't know how to translate large blocks 1311 * to smaller ones, so the pool must have the LARGE_BLOCKS 1312 * feature enabled if the stream has LARGE_BLOCKS. 1313 */ 1314 if ((featureflags & DMU_BACKUP_FEATURE_LARGE_BLOCKS) && 1315 !spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_LARGE_BLOCKS)) 1316 return (SET_ERROR(ENOTSUP)); 1317 1318 error = dsl_dataset_hold(dp, tofs, FTAG, &ds); 1319 if (error == 0) { 1320 /* target fs already exists; recv into temp clone */ 1321 1322 /* Can't recv a clone into an existing fs */ 1323 if (flags & DRR_FLAG_CLONE) { 1324 dsl_dataset_rele(ds, FTAG); 1325 return (SET_ERROR(EINVAL)); 1326 } 1327 1328 error = recv_begin_check_existing_impl(drba, ds, fromguid); 1329 dsl_dataset_rele(ds, FTAG); 1330 } else if (error == ENOENT) { 1331 /* target fs does not exist; must be a full backup or clone */ 1332 char buf[MAXNAMELEN]; 1333 1334 /* 1335 * If it's a non-clone incremental, we are missing the 1336 * target fs, so fail the recv. 1337 */ 1338 if (fromguid != 0 && !(flags & DRR_FLAG_CLONE || 1339 drba->drba_origin)) 1340 return (SET_ERROR(ENOENT)); 1341 1342 /* Open the parent of tofs */ 1343 ASSERT3U(strlen(tofs), <, MAXNAMELEN); 1344 (void) strlcpy(buf, tofs, strrchr(tofs, '/') - tofs + 1); 1345 error = dsl_dataset_hold(dp, buf, FTAG, &ds); 1346 if (error != 0) 1347 return (error); 1348 1349 /* 1350 * Check filesystem and snapshot limits before receiving. We'll 1351 * recheck snapshot limits again at the end (we create the 1352 * filesystems and increment those counts during begin_sync). 1353 */ 1354 error = dsl_fs_ss_limit_check(ds->ds_dir, 1, 1355 ZFS_PROP_FILESYSTEM_LIMIT, NULL, drba->drba_cred); 1356 if (error != 0) { 1357 dsl_dataset_rele(ds, FTAG); 1358 return (error); 1359 } 1360 1361 error = dsl_fs_ss_limit_check(ds->ds_dir, 1, 1362 ZFS_PROP_SNAPSHOT_LIMIT, NULL, drba->drba_cred); 1363 if (error != 0) { 1364 dsl_dataset_rele(ds, FTAG); 1365 return (error); 1366 } 1367 1368 if (drba->drba_origin != NULL) { 1369 dsl_dataset_t *origin; 1370 error = dsl_dataset_hold(dp, drba->drba_origin, 1371 FTAG, &origin); 1372 if (error != 0) { 1373 dsl_dataset_rele(ds, FTAG); 1374 return (error); 1375 } 1376 if (!origin->ds_is_snapshot) { 1377 dsl_dataset_rele(origin, FTAG); 1378 dsl_dataset_rele(ds, FTAG); 1379 return (SET_ERROR(EINVAL)); 1380 } 1381 if (dsl_dataset_phys(origin)->ds_guid != fromguid) { 1382 dsl_dataset_rele(origin, FTAG); 1383 dsl_dataset_rele(ds, FTAG); 1384 return (SET_ERROR(ENODEV)); 1385 } 1386 dsl_dataset_rele(origin, FTAG); 1387 } 1388 dsl_dataset_rele(ds, FTAG); 1389 error = 0; 1390 } 1391 return (error); 1392} 1393 1394static void 1395dmu_recv_begin_sync(void *arg, dmu_tx_t *tx) 1396{ 1397 dmu_recv_begin_arg_t *drba = arg; 1398 dsl_pool_t *dp = dmu_tx_pool(tx); 1399 objset_t *mos = dp->dp_meta_objset; 1400 struct drr_begin *drrb = drba->drba_cookie->drc_drrb; 1401 const char *tofs = drba->drba_cookie->drc_tofs; 1402 dsl_dataset_t *ds, *newds; 1403 uint64_t dsobj; 1404 int error; 1405 uint64_t crflags = 0; 1406 1407 if (drrb->drr_flags & DRR_FLAG_CI_DATA) 1408 crflags |= DS_FLAG_CI_DATASET; 1409 1410 error = dsl_dataset_hold(dp, tofs, FTAG, &ds); 1411 if (error == 0) { 1412 /* create temporary clone */ 1413 dsl_dataset_t *snap = NULL; 1414 if (drba->drba_snapobj != 0) { 1415 VERIFY0(dsl_dataset_hold_obj(dp, 1416 drba->drba_snapobj, FTAG, &snap)); 1417 } 1418 dsobj = dsl_dataset_create_sync(ds->ds_dir, recv_clone_name, 1419 snap, crflags, drba->drba_cred, tx); 1420 if (drba->drba_snapobj != 0) 1421 dsl_dataset_rele(snap, FTAG); 1422 dsl_dataset_rele(ds, FTAG); 1423 } else { 1424 dsl_dir_t *dd; 1425 const char *tail; 1426 dsl_dataset_t *origin = NULL; 1427 1428 VERIFY0(dsl_dir_hold(dp, tofs, FTAG, &dd, &tail)); 1429 1430 if (drba->drba_origin != NULL) { 1431 VERIFY0(dsl_dataset_hold(dp, drba->drba_origin, 1432 FTAG, &origin)); 1433 } 1434 1435 /* Create new dataset. */ 1436 dsobj = dsl_dataset_create_sync(dd, 1437 strrchr(tofs, '/') + 1, 1438 origin, crflags, drba->drba_cred, tx); 1439 if (origin != NULL) 1440 dsl_dataset_rele(origin, FTAG); 1441 dsl_dir_rele(dd, FTAG); 1442 drba->drba_cookie->drc_newfs = B_TRUE; 1443 } 1444 VERIFY0(dsl_dataset_own_obj(dp, dsobj, dmu_recv_tag, &newds)); 1445 1446 if (drba->drba_cookie->drc_resumable) { 1447 dsl_dataset_zapify(newds, tx); 1448 if (drrb->drr_fromguid != 0) { 1449 VERIFY0(zap_add(mos, dsobj, DS_FIELD_RESUME_FROMGUID, 1450 8, 1, &drrb->drr_fromguid, tx)); 1451 } 1452 VERIFY0(zap_add(mos, dsobj, DS_FIELD_RESUME_TOGUID, 1453 8, 1, &drrb->drr_toguid, tx)); 1454 VERIFY0(zap_add(mos, dsobj, DS_FIELD_RESUME_TONAME, 1455 1, strlen(drrb->drr_toname) + 1, drrb->drr_toname, tx)); 1456 uint64_t one = 1; 1457 uint64_t zero = 0; 1458 VERIFY0(zap_add(mos, dsobj, DS_FIELD_RESUME_OBJECT, 1459 8, 1, &one, tx)); 1460 VERIFY0(zap_add(mos, dsobj, DS_FIELD_RESUME_OFFSET, 1461 8, 1, &zero, tx)); 1462 VERIFY0(zap_add(mos, dsobj, DS_FIELD_RESUME_BYTES, 1463 8, 1, &zero, tx)); 1464 if (DMU_GET_FEATUREFLAGS(drrb->drr_versioninfo) & 1465 DMU_BACKUP_FEATURE_EMBED_DATA) { 1466 VERIFY0(zap_add(mos, dsobj, DS_FIELD_RESUME_EMBEDOK, 1467 8, 1, &one, tx)); 1468 } 1469 } 1470 1471 dmu_buf_will_dirty(newds->ds_dbuf, tx); 1472 dsl_dataset_phys(newds)->ds_flags |= DS_FLAG_INCONSISTENT; 1473 1474 /* 1475 * If we actually created a non-clone, we need to create the 1476 * objset in our new dataset. 1477 */ 1478 if (BP_IS_HOLE(dsl_dataset_get_blkptr(newds))) { 1479 (void) dmu_objset_create_impl(dp->dp_spa, 1480 newds, dsl_dataset_get_blkptr(newds), drrb->drr_type, tx); 1481 } 1482 1483 drba->drba_cookie->drc_ds = newds; 1484 1485 spa_history_log_internal_ds(newds, "receive", tx, ""); 1486} 1487 1488static int 1489dmu_recv_resume_begin_check(void *arg, dmu_tx_t *tx) 1490{ 1491 dmu_recv_begin_arg_t *drba = arg; 1492 dsl_pool_t *dp = dmu_tx_pool(tx); 1493 struct drr_begin *drrb = drba->drba_cookie->drc_drrb; 1494 int error; 1495 uint64_t featureflags = DMU_GET_FEATUREFLAGS(drrb->drr_versioninfo); 1496 dsl_dataset_t *ds; 1497 const char *tofs = drba->drba_cookie->drc_tofs; 1498 1499 /* already checked */ 1500 ASSERT3U(drrb->drr_magic, ==, DMU_BACKUP_MAGIC); 1501 ASSERT(featureflags & DMU_BACKUP_FEATURE_RESUMING); 1502 1503 if (DMU_GET_STREAM_HDRTYPE(drrb->drr_versioninfo) == 1504 DMU_COMPOUNDSTREAM || 1505 drrb->drr_type >= DMU_OST_NUMTYPES) 1506 return (SET_ERROR(EINVAL)); 1507 1508 /* Verify pool version supports SA if SA_SPILL feature set */ 1509 if ((featureflags & DMU_BACKUP_FEATURE_SA_SPILL) && 1510 spa_version(dp->dp_spa) < SPA_VERSION_SA) 1511 return (SET_ERROR(ENOTSUP)); 1512 1513 /* 1514 * The receiving code doesn't know how to translate a WRITE_EMBEDDED 1515 * record to a plain WRITE record, so the pool must have the 1516 * EMBEDDED_DATA feature enabled if the stream has WRITE_EMBEDDED 1517 * records. Same with WRITE_EMBEDDED records that use LZ4 compression. 1518 */ 1519 if ((featureflags & DMU_BACKUP_FEATURE_EMBED_DATA) && 1520 !spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_EMBEDDED_DATA)) 1521 return (SET_ERROR(ENOTSUP)); 1522 if ((featureflags & DMU_BACKUP_FEATURE_EMBED_DATA_LZ4) && 1523 !spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_LZ4_COMPRESS)) 1524 return (SET_ERROR(ENOTSUP)); 1525 1526 char recvname[ZFS_MAXNAMELEN]; 1527 1528 (void) snprintf(recvname, sizeof (recvname), "%s/%s", 1529 tofs, recv_clone_name); 1530 1531 if (dsl_dataset_hold(dp, recvname, FTAG, &ds) != 0) { 1532 /* %recv does not exist; continue in tofs */ 1533 error = dsl_dataset_hold(dp, tofs, FTAG, &ds); 1534 if (error != 0) 1535 return (error); 1536 } 1537 1538 /* check that ds is marked inconsistent */ 1539 if (!DS_IS_INCONSISTENT(ds)) { 1540 dsl_dataset_rele(ds, FTAG); 1541 return (SET_ERROR(EINVAL)); 1542 } 1543 1544 /* check that there is resuming data, and that the toguid matches */ 1545 if (!dsl_dataset_is_zapified(ds)) { 1546 dsl_dataset_rele(ds, FTAG); 1547 return (SET_ERROR(EINVAL)); 1548 } 1549 uint64_t val; 1550 error = zap_lookup(dp->dp_meta_objset, ds->ds_object, 1551 DS_FIELD_RESUME_TOGUID, sizeof (val), 1, &val); 1552 if (error != 0 || drrb->drr_toguid != val) { 1553 dsl_dataset_rele(ds, FTAG); 1554 return (SET_ERROR(EINVAL)); 1555 } 1556 1557 /* 1558 * Check if the receive is still running. If so, it will be owned. 1559 * Note that nothing else can own the dataset (e.g. after the receive 1560 * fails) because it will be marked inconsistent. 1561 */ 1562 if (dsl_dataset_has_owner(ds)) { 1563 dsl_dataset_rele(ds, FTAG); 1564 return (SET_ERROR(EBUSY)); 1565 } 1566 1567 /* There should not be any snapshots of this fs yet. */ 1568 if (ds->ds_prev != NULL && ds->ds_prev->ds_dir == ds->ds_dir) { 1569 dsl_dataset_rele(ds, FTAG); 1570 return (SET_ERROR(EINVAL)); 1571 } 1572 1573 /* 1574 * Note: resume point will be checked when we process the first WRITE 1575 * record. 1576 */ 1577 1578 /* check that the origin matches */ 1579 val = 0; 1580 (void) zap_lookup(dp->dp_meta_objset, ds->ds_object, 1581 DS_FIELD_RESUME_FROMGUID, sizeof (val), 1, &val); 1582 if (drrb->drr_fromguid != val) { 1583 dsl_dataset_rele(ds, FTAG); 1584 return (SET_ERROR(EINVAL)); 1585 } 1586 1587 dsl_dataset_rele(ds, FTAG); 1588 return (0); 1589} 1590 1591static void 1592dmu_recv_resume_begin_sync(void *arg, dmu_tx_t *tx) 1593{ 1594 dmu_recv_begin_arg_t *drba = arg; 1595 dsl_pool_t *dp = dmu_tx_pool(tx); 1596 const char *tofs = drba->drba_cookie->drc_tofs; 1597 dsl_dataset_t *ds; 1598 uint64_t dsobj; 1599 char recvname[ZFS_MAXNAMELEN]; 1600 1601 (void) snprintf(recvname, sizeof (recvname), "%s/%s", 1602 tofs, recv_clone_name); 1603 1604 if (dsl_dataset_hold(dp, recvname, FTAG, &ds) != 0) { 1605 /* %recv does not exist; continue in tofs */ 1606 VERIFY0(dsl_dataset_hold(dp, tofs, FTAG, &ds)); 1607 drba->drba_cookie->drc_newfs = B_TRUE; 1608 } 1609 1610 /* clear the inconsistent flag so that we can own it */ 1611 ASSERT(DS_IS_INCONSISTENT(ds)); 1612 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1613 dsl_dataset_phys(ds)->ds_flags &= ~DS_FLAG_INCONSISTENT; 1614 dsobj = ds->ds_object; 1615 dsl_dataset_rele(ds, FTAG); 1616 1617 VERIFY0(dsl_dataset_own_obj(dp, dsobj, dmu_recv_tag, &ds)); 1618 1619 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1620 dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_INCONSISTENT; 1621 1622 ASSERT(!BP_IS_HOLE(dsl_dataset_get_blkptr(ds))); 1623 1624 drba->drba_cookie->drc_ds = ds; 1625 1626 spa_history_log_internal_ds(ds, "resume receive", tx, ""); 1627} 1628 1629/* 1630 * NB: callers *MUST* call dmu_recv_stream() if dmu_recv_begin() 1631 * succeeds; otherwise we will leak the holds on the datasets. 1632 */ 1633int 1634dmu_recv_begin(char *tofs, char *tosnap, dmu_replay_record_t *drr_begin, 1635 boolean_t force, boolean_t resumable, char *origin, dmu_recv_cookie_t *drc) 1636{ 1637 dmu_recv_begin_arg_t drba = { 0 }; 1638 1639 bzero(drc, sizeof (dmu_recv_cookie_t)); 1640 drc->drc_drr_begin = drr_begin; 1641 drc->drc_drrb = &drr_begin->drr_u.drr_begin; 1642 drc->drc_tosnap = tosnap; 1643 drc->drc_tofs = tofs; 1644 drc->drc_force = force; 1645 drc->drc_resumable = resumable; 1646 drc->drc_cred = CRED(); 1647 1648 if (drc->drc_drrb->drr_magic == BSWAP_64(DMU_BACKUP_MAGIC)) { 1649 drc->drc_byteswap = B_TRUE; 1650 fletcher_4_incremental_byteswap(drr_begin, 1651 sizeof (dmu_replay_record_t), &drc->drc_cksum); 1652 byteswap_record(drr_begin); 1653 } else if (drc->drc_drrb->drr_magic == DMU_BACKUP_MAGIC) { 1654 fletcher_4_incremental_native(drr_begin, 1655 sizeof (dmu_replay_record_t), &drc->drc_cksum); 1656 } else { 1657 return (SET_ERROR(EINVAL)); 1658 } 1659 1660 drba.drba_origin = origin; 1661 drba.drba_cookie = drc; 1662 drba.drba_cred = CRED(); 1663 1664 if (DMU_GET_FEATUREFLAGS(drc->drc_drrb->drr_versioninfo) & 1665 DMU_BACKUP_FEATURE_RESUMING) { 1666 return (dsl_sync_task(tofs, 1667 dmu_recv_resume_begin_check, dmu_recv_resume_begin_sync, 1668 &drba, 5, ZFS_SPACE_CHECK_NORMAL)); 1669 } else { 1670 return (dsl_sync_task(tofs, 1671 dmu_recv_begin_check, dmu_recv_begin_sync, 1672 &drba, 5, ZFS_SPACE_CHECK_NORMAL)); 1673 } 1674} 1675 1676struct receive_record_arg { 1677 dmu_replay_record_t header; 1678 void *payload; /* Pointer to a buffer containing the payload */ 1679 /* 1680 * If the record is a write, pointer to the arc_buf_t containing the 1681 * payload. 1682 */ 1683 arc_buf_t *write_buf; 1684 int payload_size; 1685 uint64_t bytes_read; /* bytes read from stream when record created */ 1686 boolean_t eos_marker; /* Marks the end of the stream */ 1687 bqueue_node_t node; 1688}; 1689 1690struct receive_writer_arg { 1691 objset_t *os; 1692 boolean_t byteswap; 1693 bqueue_t q; 1694 1695 /* 1696 * These three args are used to signal to the main thread that we're 1697 * done. 1698 */ 1699 kmutex_t mutex; 1700 kcondvar_t cv; 1701 boolean_t done; 1702 1703 int err; 1704 /* A map from guid to dataset to help handle dedup'd streams. */ 1705 avl_tree_t *guid_to_ds_map; 1706 boolean_t resumable; 1707 uint64_t last_object, last_offset; 1708 uint64_t bytes_read; /* bytes read when current record created */ 1709}; 1710 1711struct receive_arg { 1712 objset_t *os; 1713 kthread_t *td; 1714 struct file *fp; 1715 uint64_t voff; /* The current offset in the stream */ 1716 uint64_t bytes_read; 1717 /* 1718 * A record that has had its payload read in, but hasn't yet been handed 1719 * off to the worker thread. 1720 */ 1721 struct receive_record_arg *rrd; 1722 /* A record that has had its header read in, but not its payload. */ 1723 struct receive_record_arg *next_rrd; 1724 zio_cksum_t cksum; 1725 zio_cksum_t prev_cksum; 1726 int err; 1727 boolean_t byteswap; 1728 /* Sorted list of objects not to issue prefetches for. */ 1729 list_t ignore_obj_list; 1730}; 1731 1732struct receive_ign_obj_node { 1733 list_node_t node; 1734 uint64_t object; 1735}; 1736 1737typedef struct guid_map_entry { 1738 uint64_t guid; 1739 dsl_dataset_t *gme_ds; 1740 avl_node_t avlnode; 1741} guid_map_entry_t; 1742 1743static int 1744guid_compare(const void *arg1, const void *arg2) 1745{ 1746 const guid_map_entry_t *gmep1 = arg1; 1747 const guid_map_entry_t *gmep2 = arg2; 1748 1749 if (gmep1->guid < gmep2->guid) 1750 return (-1); 1751 else if (gmep1->guid > gmep2->guid) 1752 return (1); 1753 return (0); 1754} 1755 1756static void 1757free_guid_map_onexit(void *arg) 1758{ 1759 avl_tree_t *ca = arg; 1760 void *cookie = NULL; 1761 guid_map_entry_t *gmep; 1762 1763 while ((gmep = avl_destroy_nodes(ca, &cookie)) != NULL) { 1764 dsl_dataset_long_rele(gmep->gme_ds, gmep); 1765 dsl_dataset_rele(gmep->gme_ds, gmep); 1766 kmem_free(gmep, sizeof (guid_map_entry_t)); 1767 } 1768 avl_destroy(ca); 1769 kmem_free(ca, sizeof (avl_tree_t)); 1770} 1771 1772static int 1773restore_bytes(struct receive_arg *ra, void *buf, int len, off_t off, ssize_t *resid) 1774{ 1775 struct uio auio; 1776 struct iovec aiov; 1777 int error; 1778 1779 aiov.iov_base = buf; 1780 aiov.iov_len = len; 1781 auio.uio_iov = &aiov; 1782 auio.uio_iovcnt = 1; 1783 auio.uio_resid = len; 1784 auio.uio_segflg = UIO_SYSSPACE; 1785 auio.uio_rw = UIO_READ; 1786 auio.uio_offset = off; 1787 auio.uio_td = ra->td; 1788#ifdef _KERNEL 1789 error = fo_read(ra->fp, &auio, ra->td->td_ucred, FOF_OFFSET, ra->td); 1790#else 1791 fprintf(stderr, "%s: returning EOPNOTSUPP\n", __func__); 1792 error = EOPNOTSUPP; 1793#endif 1794 *resid = auio.uio_resid; 1795 return (error); 1796} 1797 1798static int 1799receive_read(struct receive_arg *ra, int len, void *buf) 1800{ 1801 int done = 0; 1802 1803 /* some things will require 8-byte alignment, so everything must */ 1804 ASSERT0(len % 8); 1805 1806 while (done < len) { 1807 ssize_t resid; 1808 1809 ra->err = restore_bytes(ra, buf + done, 1810 len - done, ra->voff, &resid); 1811 1812 if (resid == len - done) { 1813 /* 1814 * Note: ECKSUM indicates that the receive 1815 * was interrupted and can potentially be resumed. 1816 */ 1817 ra->err = SET_ERROR(ECKSUM); 1818 } 1819 ra->voff += len - done - resid; 1820 done = len - resid; 1821 if (ra->err != 0) 1822 return (ra->err); 1823 } 1824 1825 ra->bytes_read += len; 1826 1827 ASSERT3U(done, ==, len); 1828 return (0); 1829} 1830 1831static void 1832byteswap_record(dmu_replay_record_t *drr) 1833{ 1834#define DO64(X) (drr->drr_u.X = BSWAP_64(drr->drr_u.X)) 1835#define DO32(X) (drr->drr_u.X = BSWAP_32(drr->drr_u.X)) 1836 drr->drr_type = BSWAP_32(drr->drr_type); 1837 drr->drr_payloadlen = BSWAP_32(drr->drr_payloadlen); 1838 1839 switch (drr->drr_type) { 1840 case DRR_BEGIN: 1841 DO64(drr_begin.drr_magic); 1842 DO64(drr_begin.drr_versioninfo); 1843 DO64(drr_begin.drr_creation_time); 1844 DO32(drr_begin.drr_type); 1845 DO32(drr_begin.drr_flags); 1846 DO64(drr_begin.drr_toguid); 1847 DO64(drr_begin.drr_fromguid); 1848 break; 1849 case DRR_OBJECT: 1850 DO64(drr_object.drr_object); 1851 DO32(drr_object.drr_type); 1852 DO32(drr_object.drr_bonustype); 1853 DO32(drr_object.drr_blksz); 1854 DO32(drr_object.drr_bonuslen); 1855 DO64(drr_object.drr_toguid); 1856 break; 1857 case DRR_FREEOBJECTS: 1858 DO64(drr_freeobjects.drr_firstobj); 1859 DO64(drr_freeobjects.drr_numobjs); 1860 DO64(drr_freeobjects.drr_toguid); 1861 break; 1862 case DRR_WRITE: 1863 DO64(drr_write.drr_object); 1864 DO32(drr_write.drr_type); 1865 DO64(drr_write.drr_offset); 1866 DO64(drr_write.drr_length); 1867 DO64(drr_write.drr_toguid); 1868 ZIO_CHECKSUM_BSWAP(&drr->drr_u.drr_write.drr_key.ddk_cksum); 1869 DO64(drr_write.drr_key.ddk_prop); 1870 break; 1871 case DRR_WRITE_BYREF: 1872 DO64(drr_write_byref.drr_object); 1873 DO64(drr_write_byref.drr_offset); 1874 DO64(drr_write_byref.drr_length); 1875 DO64(drr_write_byref.drr_toguid); 1876 DO64(drr_write_byref.drr_refguid); 1877 DO64(drr_write_byref.drr_refobject); 1878 DO64(drr_write_byref.drr_refoffset); 1879 ZIO_CHECKSUM_BSWAP(&drr->drr_u.drr_write_byref. 1880 drr_key.ddk_cksum); 1881 DO64(drr_write_byref.drr_key.ddk_prop); 1882 break; 1883 case DRR_WRITE_EMBEDDED: 1884 DO64(drr_write_embedded.drr_object); 1885 DO64(drr_write_embedded.drr_offset); 1886 DO64(drr_write_embedded.drr_length); 1887 DO64(drr_write_embedded.drr_toguid); 1888 DO32(drr_write_embedded.drr_lsize); 1889 DO32(drr_write_embedded.drr_psize); 1890 break; 1891 case DRR_FREE: 1892 DO64(drr_free.drr_object); 1893 DO64(drr_free.drr_offset); 1894 DO64(drr_free.drr_length); 1895 DO64(drr_free.drr_toguid); 1896 break; 1897 case DRR_SPILL: 1898 DO64(drr_spill.drr_object); 1899 DO64(drr_spill.drr_length); 1900 DO64(drr_spill.drr_toguid); 1901 break; 1902 case DRR_END: 1903 DO64(drr_end.drr_toguid); 1904 ZIO_CHECKSUM_BSWAP(&drr->drr_u.drr_end.drr_checksum); 1905 break; 1906 } 1907 1908 if (drr->drr_type != DRR_BEGIN) { 1909 ZIO_CHECKSUM_BSWAP(&drr->drr_u.drr_checksum.drr_checksum); 1910 } 1911 1912#undef DO64 1913#undef DO32 1914} 1915 1916static inline uint8_t 1917deduce_nblkptr(dmu_object_type_t bonus_type, uint64_t bonus_size) 1918{ 1919 if (bonus_type == DMU_OT_SA) { 1920 return (1); 1921 } else { 1922 return (1 + 1923 ((DN_MAX_BONUSLEN - bonus_size) >> SPA_BLKPTRSHIFT)); 1924 } 1925} 1926 1927static void 1928save_resume_state(struct receive_writer_arg *rwa, 1929 uint64_t object, uint64_t offset, dmu_tx_t *tx) 1930{ 1931 int txgoff = dmu_tx_get_txg(tx) & TXG_MASK; 1932 1933 if (!rwa->resumable) 1934 return; 1935 1936 /* 1937 * We use ds_resume_bytes[] != 0 to indicate that we need to 1938 * update this on disk, so it must not be 0. 1939 */ 1940 ASSERT(rwa->bytes_read != 0); 1941 1942 /* 1943 * We only resume from write records, which have a valid 1944 * (non-meta-dnode) object number. 1945 */ 1946 ASSERT(object != 0); 1947 1948 /* 1949 * For resuming to work correctly, we must receive records in order, 1950 * sorted by object,offset. This is checked by the callers, but 1951 * assert it here for good measure. 1952 */ 1953 ASSERT3U(object, >=, rwa->os->os_dsl_dataset->ds_resume_object[txgoff]); 1954 ASSERT(object != rwa->os->os_dsl_dataset->ds_resume_object[txgoff] || 1955 offset >= rwa->os->os_dsl_dataset->ds_resume_offset[txgoff]); 1956 ASSERT3U(rwa->bytes_read, >=, 1957 rwa->os->os_dsl_dataset->ds_resume_bytes[txgoff]); 1958 1959 rwa->os->os_dsl_dataset->ds_resume_object[txgoff] = object; 1960 rwa->os->os_dsl_dataset->ds_resume_offset[txgoff] = offset; 1961 rwa->os->os_dsl_dataset->ds_resume_bytes[txgoff] = rwa->bytes_read; 1962} 1963 1964static int 1965receive_object(struct receive_writer_arg *rwa, struct drr_object *drro, 1966 void *data) 1967{ 1968 dmu_object_info_t doi; 1969 dmu_tx_t *tx; 1970 uint64_t object; 1971 int err; 1972 1973 if (drro->drr_type == DMU_OT_NONE || 1974 !DMU_OT_IS_VALID(drro->drr_type) || 1975 !DMU_OT_IS_VALID(drro->drr_bonustype) || 1976 drro->drr_checksumtype >= ZIO_CHECKSUM_FUNCTIONS || 1977 drro->drr_compress >= ZIO_COMPRESS_FUNCTIONS || 1978 P2PHASE(drro->drr_blksz, SPA_MINBLOCKSIZE) || 1979 drro->drr_blksz < SPA_MINBLOCKSIZE || 1980 drro->drr_blksz > spa_maxblocksize(dmu_objset_spa(rwa->os)) || 1981 drro->drr_bonuslen > DN_MAX_BONUSLEN) { 1982 return (SET_ERROR(EINVAL)); 1983 } 1984 1985 err = dmu_object_info(rwa->os, drro->drr_object, &doi); 1986 1987 if (err != 0 && err != ENOENT) 1988 return (SET_ERROR(EINVAL)); 1989 object = err == 0 ? drro->drr_object : DMU_NEW_OBJECT; 1990 1991 /* 1992 * If we are losing blkptrs or changing the block size this must 1993 * be a new file instance. We must clear out the previous file 1994 * contents before we can change this type of metadata in the dnode. 1995 */ 1996 if (err == 0) { 1997 int nblkptr; 1998 1999 nblkptr = deduce_nblkptr(drro->drr_bonustype, 2000 drro->drr_bonuslen); 2001 2002 if (drro->drr_blksz != doi.doi_data_block_size || 2003 nblkptr < doi.doi_nblkptr) { 2004 err = dmu_free_long_range(rwa->os, drro->drr_object, 2005 0, DMU_OBJECT_END); 2006 if (err != 0) 2007 return (SET_ERROR(EINVAL)); 2008 } 2009 } 2010 2011 tx = dmu_tx_create(rwa->os); 2012 dmu_tx_hold_bonus(tx, object); 2013 err = dmu_tx_assign(tx, TXG_WAIT); 2014 if (err != 0) { 2015 dmu_tx_abort(tx); 2016 return (err); 2017 } 2018 2019 if (object == DMU_NEW_OBJECT) { 2020 /* currently free, want to be allocated */ 2021 err = dmu_object_claim(rwa->os, drro->drr_object, 2022 drro->drr_type, drro->drr_blksz, 2023 drro->drr_bonustype, drro->drr_bonuslen, tx); 2024 } else if (drro->drr_type != doi.doi_type || 2025 drro->drr_blksz != doi.doi_data_block_size || 2026 drro->drr_bonustype != doi.doi_bonus_type || 2027 drro->drr_bonuslen != doi.doi_bonus_size) { 2028 /* currently allocated, but with different properties */ 2029 err = dmu_object_reclaim(rwa->os, drro->drr_object, 2030 drro->drr_type, drro->drr_blksz, 2031 drro->drr_bonustype, drro->drr_bonuslen, tx); 2032 } 2033 if (err != 0) { 2034 dmu_tx_commit(tx); 2035 return (SET_ERROR(EINVAL)); 2036 } 2037 2038 dmu_object_set_checksum(rwa->os, drro->drr_object, 2039 drro->drr_checksumtype, tx); 2040 dmu_object_set_compress(rwa->os, drro->drr_object, 2041 drro->drr_compress, tx); 2042 2043 if (data != NULL) { 2044 dmu_buf_t *db; 2045 2046 VERIFY0(dmu_bonus_hold(rwa->os, drro->drr_object, FTAG, &db)); 2047 dmu_buf_will_dirty(db, tx); 2048 2049 ASSERT3U(db->db_size, >=, drro->drr_bonuslen); 2050 bcopy(data, db->db_data, drro->drr_bonuslen); 2051 if (rwa->byteswap) { 2052 dmu_object_byteswap_t byteswap = 2053 DMU_OT_BYTESWAP(drro->drr_bonustype); 2054 dmu_ot_byteswap[byteswap].ob_func(db->db_data, 2055 drro->drr_bonuslen); 2056 } 2057 dmu_buf_rele(db, FTAG); 2058 } 2059 dmu_tx_commit(tx); 2060 2061 return (0); 2062} 2063 2064/* ARGSUSED */ 2065static int 2066receive_freeobjects(struct receive_writer_arg *rwa, 2067 struct drr_freeobjects *drrfo) 2068{ 2069 uint64_t obj; 2070 2071 if (drrfo->drr_firstobj + drrfo->drr_numobjs < drrfo->drr_firstobj) 2072 return (SET_ERROR(EINVAL)); 2073 2074 for (obj = drrfo->drr_firstobj; 2075 obj < drrfo->drr_firstobj + drrfo->drr_numobjs; 2076 (void) dmu_object_next(rwa->os, &obj, FALSE, 0)) { 2077 int err; 2078 2079 if (dmu_object_info(rwa->os, obj, NULL) != 0) 2080 continue; 2081 2082 err = dmu_free_long_object(rwa->os, obj); 2083 if (err != 0) 2084 return (err); 2085 } 2086 2087 return (0); 2088} 2089 2090static int 2091receive_write(struct receive_writer_arg *rwa, struct drr_write *drrw, 2092 arc_buf_t *abuf) 2093{ 2094 dmu_tx_t *tx; 2095 int err; 2096 2097 if (drrw->drr_offset + drrw->drr_length < drrw->drr_offset || 2098 !DMU_OT_IS_VALID(drrw->drr_type)) 2099 return (SET_ERROR(EINVAL)); 2100 2101 /* 2102 * For resuming to work, records must be in increasing order 2103 * by (object, offset). 2104 */ 2105 if (drrw->drr_object < rwa->last_object || 2106 (drrw->drr_object == rwa->last_object && 2107 drrw->drr_offset < rwa->last_offset)) { 2108 return (SET_ERROR(EINVAL)); 2109 } 2110 rwa->last_object = drrw->drr_object; 2111 rwa->last_offset = drrw->drr_offset; 2112 2113 if (dmu_object_info(rwa->os, drrw->drr_object, NULL) != 0) 2114 return (SET_ERROR(EINVAL)); 2115 2116 tx = dmu_tx_create(rwa->os); 2117 2118 dmu_tx_hold_write(tx, drrw->drr_object, 2119 drrw->drr_offset, drrw->drr_length); 2120 err = dmu_tx_assign(tx, TXG_WAIT); 2121 if (err != 0) { 2122 dmu_tx_abort(tx); 2123 return (err); 2124 } 2125 if (rwa->byteswap) { 2126 dmu_object_byteswap_t byteswap = 2127 DMU_OT_BYTESWAP(drrw->drr_type); 2128 dmu_ot_byteswap[byteswap].ob_func(abuf->b_data, 2129 drrw->drr_length); 2130 } 2131 2132 dmu_buf_t *bonus; 2133 if (dmu_bonus_hold(rwa->os, drrw->drr_object, FTAG, &bonus) != 0) 2134 return (SET_ERROR(EINVAL)); 2135 dmu_assign_arcbuf(bonus, drrw->drr_offset, abuf, tx); 2136 2137 /* 2138 * Note: If the receive fails, we want the resume stream to start 2139 * with the same record that we last successfully received (as opposed 2140 * to the next record), so that we can verify that we are 2141 * resuming from the correct location. 2142 */ 2143 save_resume_state(rwa, drrw->drr_object, drrw->drr_offset, tx); 2144 dmu_tx_commit(tx); 2145 dmu_buf_rele(bonus, FTAG); 2146 2147 return (0); 2148} 2149 2150/* 2151 * Handle a DRR_WRITE_BYREF record. This record is used in dedup'ed 2152 * streams to refer to a copy of the data that is already on the 2153 * system because it came in earlier in the stream. This function 2154 * finds the earlier copy of the data, and uses that copy instead of 2155 * data from the stream to fulfill this write. 2156 */ 2157static int 2158receive_write_byref(struct receive_writer_arg *rwa, 2159 struct drr_write_byref *drrwbr) 2160{ 2161 dmu_tx_t *tx; 2162 int err; 2163 guid_map_entry_t gmesrch; 2164 guid_map_entry_t *gmep; 2165 avl_index_t where; 2166 objset_t *ref_os = NULL; 2167 dmu_buf_t *dbp; 2168 2169 if (drrwbr->drr_offset + drrwbr->drr_length < drrwbr->drr_offset) 2170 return (SET_ERROR(EINVAL)); 2171 2172 /* 2173 * If the GUID of the referenced dataset is different from the 2174 * GUID of the target dataset, find the referenced dataset. 2175 */ 2176 if (drrwbr->drr_toguid != drrwbr->drr_refguid) { 2177 gmesrch.guid = drrwbr->drr_refguid; 2178 if ((gmep = avl_find(rwa->guid_to_ds_map, &gmesrch, 2179 &where)) == NULL) { 2180 return (SET_ERROR(EINVAL)); 2181 } 2182 if (dmu_objset_from_ds(gmep->gme_ds, &ref_os)) 2183 return (SET_ERROR(EINVAL)); 2184 } else { 2185 ref_os = rwa->os; 2186 } 2187 2188 err = dmu_buf_hold(ref_os, drrwbr->drr_refobject, 2189 drrwbr->drr_refoffset, FTAG, &dbp, DMU_READ_PREFETCH); 2190 if (err != 0) 2191 return (err); 2192 2193 tx = dmu_tx_create(rwa->os); 2194 2195 dmu_tx_hold_write(tx, drrwbr->drr_object, 2196 drrwbr->drr_offset, drrwbr->drr_length); 2197 err = dmu_tx_assign(tx, TXG_WAIT); 2198 if (err != 0) { 2199 dmu_tx_abort(tx); 2200 return (err); 2201 } 2202 dmu_write(rwa->os, drrwbr->drr_object, 2203 drrwbr->drr_offset, drrwbr->drr_length, dbp->db_data, tx); 2204 dmu_buf_rele(dbp, FTAG); 2205 2206 /* See comment in restore_write. */ 2207 save_resume_state(rwa, drrwbr->drr_object, drrwbr->drr_offset, tx); 2208 dmu_tx_commit(tx); 2209 return (0); 2210} 2211 2212static int 2213receive_write_embedded(struct receive_writer_arg *rwa, 2214 struct drr_write_embedded *drrwe, void *data) 2215{ 2216 dmu_tx_t *tx; 2217 int err; 2218 2219 if (drrwe->drr_offset + drrwe->drr_length < drrwe->drr_offset) 2220 return (EINVAL); 2221 2222 if (drrwe->drr_psize > BPE_PAYLOAD_SIZE) 2223 return (EINVAL); 2224 2225 if (drrwe->drr_etype >= NUM_BP_EMBEDDED_TYPES) 2226 return (EINVAL); 2227 if (drrwe->drr_compression >= ZIO_COMPRESS_FUNCTIONS) 2228 return (EINVAL); 2229 2230 tx = dmu_tx_create(rwa->os); 2231 2232 dmu_tx_hold_write(tx, drrwe->drr_object, 2233 drrwe->drr_offset, drrwe->drr_length); 2234 err = dmu_tx_assign(tx, TXG_WAIT); 2235 if (err != 0) { 2236 dmu_tx_abort(tx); 2237 return (err); 2238 } 2239 2240 dmu_write_embedded(rwa->os, drrwe->drr_object, 2241 drrwe->drr_offset, data, drrwe->drr_etype, 2242 drrwe->drr_compression, drrwe->drr_lsize, drrwe->drr_psize, 2243 rwa->byteswap ^ ZFS_HOST_BYTEORDER, tx); 2244 2245 /* See comment in restore_write. */ 2246 save_resume_state(rwa, drrwe->drr_object, drrwe->drr_offset, tx); 2247 dmu_tx_commit(tx); 2248 return (0); 2249} 2250 2251static int 2252receive_spill(struct receive_writer_arg *rwa, struct drr_spill *drrs, 2253 void *data) 2254{ 2255 dmu_tx_t *tx; 2256 dmu_buf_t *db, *db_spill; 2257 int err; 2258 2259 if (drrs->drr_length < SPA_MINBLOCKSIZE || 2260 drrs->drr_length > spa_maxblocksize(dmu_objset_spa(rwa->os))) 2261 return (SET_ERROR(EINVAL)); 2262 2263 if (dmu_object_info(rwa->os, drrs->drr_object, NULL) != 0) 2264 return (SET_ERROR(EINVAL)); 2265 2266 VERIFY0(dmu_bonus_hold(rwa->os, drrs->drr_object, FTAG, &db)); 2267 if ((err = dmu_spill_hold_by_bonus(db, FTAG, &db_spill)) != 0) { 2268 dmu_buf_rele(db, FTAG); 2269 return (err); 2270 } 2271 2272 tx = dmu_tx_create(rwa->os); 2273 2274 dmu_tx_hold_spill(tx, db->db_object); 2275 2276 err = dmu_tx_assign(tx, TXG_WAIT); 2277 if (err != 0) { 2278 dmu_buf_rele(db, FTAG); 2279 dmu_buf_rele(db_spill, FTAG); 2280 dmu_tx_abort(tx); 2281 return (err); 2282 } 2283 dmu_buf_will_dirty(db_spill, tx); 2284 2285 if (db_spill->db_size < drrs->drr_length) 2286 VERIFY(0 == dbuf_spill_set_blksz(db_spill, 2287 drrs->drr_length, tx)); 2288 bcopy(data, db_spill->db_data, drrs->drr_length); 2289 2290 dmu_buf_rele(db, FTAG); 2291 dmu_buf_rele(db_spill, FTAG); 2292 2293 dmu_tx_commit(tx); 2294 return (0); 2295} 2296 2297/* ARGSUSED */ 2298static int 2299receive_free(struct receive_writer_arg *rwa, struct drr_free *drrf) 2300{ 2301 int err; 2302 2303 if (drrf->drr_length != -1ULL && 2304 drrf->drr_offset + drrf->drr_length < drrf->drr_offset) 2305 return (SET_ERROR(EINVAL)); 2306 2307 if (dmu_object_info(rwa->os, drrf->drr_object, NULL) != 0) 2308 return (SET_ERROR(EINVAL)); 2309 2310 err = dmu_free_long_range(rwa->os, drrf->drr_object, 2311 drrf->drr_offset, drrf->drr_length); 2312 2313 return (err); 2314} 2315 2316/* used to destroy the drc_ds on error */ 2317static void 2318dmu_recv_cleanup_ds(dmu_recv_cookie_t *drc) 2319{ 2320 if (drc->drc_resumable) { 2321 /* wait for our resume state to be written to disk */ 2322 txg_wait_synced(drc->drc_ds->ds_dir->dd_pool, 0); 2323 dsl_dataset_disown(drc->drc_ds, dmu_recv_tag); 2324 } else { 2325 char name[MAXNAMELEN]; 2326 dsl_dataset_name(drc->drc_ds, name); 2327 dsl_dataset_disown(drc->drc_ds, dmu_recv_tag); 2328 (void) dsl_destroy_head(name); 2329 } 2330} 2331 2332static void 2333receive_cksum(struct receive_arg *ra, int len, void *buf) 2334{ 2335 if (ra->byteswap) { 2336 fletcher_4_incremental_byteswap(buf, len, &ra->cksum); 2337 } else { 2338 fletcher_4_incremental_native(buf, len, &ra->cksum); 2339 } 2340} 2341 2342/* 2343 * Read the payload into a buffer of size len, and update the current record's 2344 * payload field. 2345 * Allocate ra->next_rrd and read the next record's header into 2346 * ra->next_rrd->header. 2347 * Verify checksum of payload and next record. 2348 */ 2349static int 2350receive_read_payload_and_next_header(struct receive_arg *ra, int len, void *buf) 2351{ 2352 int err; 2353 2354 if (len != 0) { 2355 ASSERT3U(len, <=, SPA_MAXBLOCKSIZE); 2356 err = receive_read(ra, len, buf); 2357 if (err != 0) 2358 return (err); 2359 receive_cksum(ra, len, buf); 2360 2361 /* note: rrd is NULL when reading the begin record's payload */ 2362 if (ra->rrd != NULL) { 2363 ra->rrd->payload = buf; 2364 ra->rrd->payload_size = len; 2365 ra->rrd->bytes_read = ra->bytes_read; 2366 } 2367 } 2368 2369 ra->prev_cksum = ra->cksum; 2370 2371 ra->next_rrd = kmem_zalloc(sizeof (*ra->next_rrd), KM_SLEEP); 2372 err = receive_read(ra, sizeof (ra->next_rrd->header), 2373 &ra->next_rrd->header); 2374 ra->next_rrd->bytes_read = ra->bytes_read; 2375 if (err != 0) { 2376 kmem_free(ra->next_rrd, sizeof (*ra->next_rrd)); 2377 ra->next_rrd = NULL; 2378 return (err); 2379 } 2380 if (ra->next_rrd->header.drr_type == DRR_BEGIN) { 2381 kmem_free(ra->next_rrd, sizeof (*ra->next_rrd)); 2382 ra->next_rrd = NULL; 2383 return (SET_ERROR(EINVAL)); 2384 } 2385 2386 /* 2387 * Note: checksum is of everything up to but not including the 2388 * checksum itself. 2389 */ 2390 ASSERT3U(offsetof(dmu_replay_record_t, drr_u.drr_checksum.drr_checksum), 2391 ==, sizeof (dmu_replay_record_t) - sizeof (zio_cksum_t)); 2392 receive_cksum(ra, 2393 offsetof(dmu_replay_record_t, drr_u.drr_checksum.drr_checksum), 2394 &ra->next_rrd->header); 2395 2396 zio_cksum_t cksum_orig = 2397 ra->next_rrd->header.drr_u.drr_checksum.drr_checksum; 2398 zio_cksum_t *cksump = 2399 &ra->next_rrd->header.drr_u.drr_checksum.drr_checksum; 2400 2401 if (ra->byteswap) 2402 byteswap_record(&ra->next_rrd->header); 2403 2404 if ((!ZIO_CHECKSUM_IS_ZERO(cksump)) && 2405 !ZIO_CHECKSUM_EQUAL(ra->cksum, *cksump)) { 2406 kmem_free(ra->next_rrd, sizeof (*ra->next_rrd)); 2407 ra->next_rrd = NULL; 2408 return (SET_ERROR(ECKSUM)); 2409 } 2410 2411 receive_cksum(ra, sizeof (cksum_orig), &cksum_orig); 2412 2413 return (0); 2414} 2415 2416/* 2417 * Issue the prefetch reads for any necessary indirect blocks. 2418 * 2419 * We use the object ignore list to tell us whether or not to issue prefetches 2420 * for a given object. We do this for both correctness (in case the blocksize 2421 * of an object has changed) and performance (if the object doesn't exist, don't 2422 * needlessly try to issue prefetches). We also trim the list as we go through 2423 * the stream to prevent it from growing to an unbounded size. 2424 * 2425 * The object numbers within will always be in sorted order, and any write 2426 * records we see will also be in sorted order, but they're not sorted with 2427 * respect to each other (i.e. we can get several object records before 2428 * receiving each object's write records). As a result, once we've reached a 2429 * given object number, we can safely remove any reference to lower object 2430 * numbers in the ignore list. In practice, we receive up to 32 object records 2431 * before receiving write records, so the list can have up to 32 nodes in it. 2432 */ 2433/* ARGSUSED */ 2434static void 2435receive_read_prefetch(struct receive_arg *ra, 2436 uint64_t object, uint64_t offset, uint64_t length) 2437{ 2438 struct receive_ign_obj_node *node = list_head(&ra->ignore_obj_list); 2439 while (node != NULL && node->object < object) { 2440 VERIFY3P(node, ==, list_remove_head(&ra->ignore_obj_list)); 2441 kmem_free(node, sizeof (*node)); 2442 node = list_head(&ra->ignore_obj_list); 2443 } 2444 if (node == NULL || node->object > object) { 2445 dmu_prefetch(ra->os, object, 1, offset, length, 2446 ZIO_PRIORITY_SYNC_READ); 2447 } 2448} 2449 2450/* 2451 * Read records off the stream, issuing any necessary prefetches. 2452 */ 2453static int 2454receive_read_record(struct receive_arg *ra) 2455{ 2456 int err; 2457 2458 switch (ra->rrd->header.drr_type) { 2459 case DRR_OBJECT: 2460 { 2461 struct drr_object *drro = &ra->rrd->header.drr_u.drr_object; 2462 uint32_t size = P2ROUNDUP(drro->drr_bonuslen, 8); 2463 void *buf = kmem_zalloc(size, KM_SLEEP); 2464 dmu_object_info_t doi; 2465 err = receive_read_payload_and_next_header(ra, size, buf); 2466 if (err != 0) { 2467 kmem_free(buf, size); 2468 return (err); 2469 } 2470 err = dmu_object_info(ra->os, drro->drr_object, &doi); 2471 /* 2472 * See receive_read_prefetch for an explanation why we're 2473 * storing this object in the ignore_obj_list. 2474 */ 2475 if (err == ENOENT || 2476 (err == 0 && doi.doi_data_block_size != drro->drr_blksz)) { 2477 struct receive_ign_obj_node *node = 2478 kmem_zalloc(sizeof (*node), 2479 KM_SLEEP); 2480 node->object = drro->drr_object; 2481#ifdef ZFS_DEBUG 2482 struct receive_ign_obj_node *last_object = 2483 list_tail(&ra->ignore_obj_list); 2484 uint64_t last_objnum = (last_object != NULL ? 2485 last_object->object : 0); 2486 ASSERT3U(node->object, >, last_objnum); 2487#endif 2488 list_insert_tail(&ra->ignore_obj_list, node); 2489 err = 0; 2490 } 2491 return (err); 2492 } 2493 case DRR_FREEOBJECTS: 2494 { 2495 err = receive_read_payload_and_next_header(ra, 0, NULL); 2496 return (err); 2497 } 2498 case DRR_WRITE: 2499 { 2500 struct drr_write *drrw = &ra->rrd->header.drr_u.drr_write; 2501 arc_buf_t *abuf = arc_loan_buf(dmu_objset_spa(ra->os), 2502 drrw->drr_length); 2503 2504 err = receive_read_payload_and_next_header(ra, 2505 drrw->drr_length, abuf->b_data); 2506 if (err != 0) { 2507 dmu_return_arcbuf(abuf); 2508 return (err); 2509 } 2510 ra->rrd->write_buf = abuf; 2511 receive_read_prefetch(ra, drrw->drr_object, drrw->drr_offset, 2512 drrw->drr_length); 2513 return (err); 2514 } 2515 case DRR_WRITE_BYREF: 2516 { 2517 struct drr_write_byref *drrwb = 2518 &ra->rrd->header.drr_u.drr_write_byref; 2519 err = receive_read_payload_and_next_header(ra, 0, NULL); 2520 receive_read_prefetch(ra, drrwb->drr_object, drrwb->drr_offset, 2521 drrwb->drr_length); 2522 return (err); 2523 } 2524 case DRR_WRITE_EMBEDDED: 2525 { 2526 struct drr_write_embedded *drrwe = 2527 &ra->rrd->header.drr_u.drr_write_embedded; 2528 uint32_t size = P2ROUNDUP(drrwe->drr_psize, 8); 2529 void *buf = kmem_zalloc(size, KM_SLEEP); 2530 2531 err = receive_read_payload_and_next_header(ra, size, buf); 2532 if (err != 0) { 2533 kmem_free(buf, size); 2534 return (err); 2535 } 2536 2537 receive_read_prefetch(ra, drrwe->drr_object, drrwe->drr_offset, 2538 drrwe->drr_length); 2539 return (err); 2540 } 2541 case DRR_FREE: 2542 { 2543 /* 2544 * It might be beneficial to prefetch indirect blocks here, but 2545 * we don't really have the data to decide for sure. 2546 */ 2547 err = receive_read_payload_and_next_header(ra, 0, NULL); 2548 return (err); 2549 } 2550 case DRR_END: 2551 { 2552 struct drr_end *drre = &ra->rrd->header.drr_u.drr_end; 2553 if (!ZIO_CHECKSUM_EQUAL(ra->prev_cksum, drre->drr_checksum)) 2554 return (SET_ERROR(ECKSUM)); 2555 return (0); 2556 } 2557 case DRR_SPILL: 2558 { 2559 struct drr_spill *drrs = &ra->rrd->header.drr_u.drr_spill; 2560 void *buf = kmem_zalloc(drrs->drr_length, KM_SLEEP); 2561 err = receive_read_payload_and_next_header(ra, drrs->drr_length, 2562 buf); 2563 if (err != 0) 2564 kmem_free(buf, drrs->drr_length); 2565 return (err); 2566 } 2567 default: 2568 return (SET_ERROR(EINVAL)); 2569 } 2570} 2571 2572/* 2573 * Commit the records to the pool. 2574 */ 2575static int 2576receive_process_record(struct receive_writer_arg *rwa, 2577 struct receive_record_arg *rrd) 2578{ 2579 int err; 2580 2581 /* Processing in order, therefore bytes_read should be increasing. */ 2582 ASSERT3U(rrd->bytes_read, >=, rwa->bytes_read); 2583 rwa->bytes_read = rrd->bytes_read; 2584 2585 switch (rrd->header.drr_type) { 2586 case DRR_OBJECT: 2587 { 2588 struct drr_object *drro = &rrd->header.drr_u.drr_object; 2589 err = receive_object(rwa, drro, rrd->payload); 2590 kmem_free(rrd->payload, rrd->payload_size); 2591 rrd->payload = NULL; 2592 return (err); 2593 } 2594 case DRR_FREEOBJECTS: 2595 { 2596 struct drr_freeobjects *drrfo = 2597 &rrd->header.drr_u.drr_freeobjects; 2598 return (receive_freeobjects(rwa, drrfo)); 2599 } 2600 case DRR_WRITE: 2601 { 2602 struct drr_write *drrw = &rrd->header.drr_u.drr_write; 2603 err = receive_write(rwa, drrw, rrd->write_buf); 2604 /* if receive_write() is successful, it consumes the arc_buf */ 2605 if (err != 0) 2606 dmu_return_arcbuf(rrd->write_buf); 2607 rrd->write_buf = NULL; 2608 rrd->payload = NULL; 2609 return (err); 2610 } 2611 case DRR_WRITE_BYREF: 2612 { 2613 struct drr_write_byref *drrwbr = 2614 &rrd->header.drr_u.drr_write_byref; 2615 return (receive_write_byref(rwa, drrwbr)); 2616 } 2617 case DRR_WRITE_EMBEDDED: 2618 { 2619 struct drr_write_embedded *drrwe = 2620 &rrd->header.drr_u.drr_write_embedded; 2621 err = receive_write_embedded(rwa, drrwe, rrd->payload); 2622 kmem_free(rrd->payload, rrd->payload_size); 2623 rrd->payload = NULL; 2624 return (err); 2625 } 2626 case DRR_FREE: 2627 { 2628 struct drr_free *drrf = &rrd->header.drr_u.drr_free; 2629 return (receive_free(rwa, drrf)); 2630 } 2631 case DRR_SPILL: 2632 { 2633 struct drr_spill *drrs = &rrd->header.drr_u.drr_spill; 2634 err = receive_spill(rwa, drrs, rrd->payload); 2635 kmem_free(rrd->payload, rrd->payload_size); 2636 rrd->payload = NULL; 2637 return (err); 2638 } 2639 default: 2640 return (SET_ERROR(EINVAL)); 2641 } 2642} 2643 2644/* 2645 * dmu_recv_stream's worker thread; pull records off the queue, and then call 2646 * receive_process_record When we're done, signal the main thread and exit. 2647 */ 2648static void 2649receive_writer_thread(void *arg) 2650{ 2651 struct receive_writer_arg *rwa = arg; 2652 struct receive_record_arg *rrd; 2653 for (rrd = bqueue_dequeue(&rwa->q); !rrd->eos_marker; 2654 rrd = bqueue_dequeue(&rwa->q)) { 2655 /* 2656 * If there's an error, the main thread will stop putting things 2657 * on the queue, but we need to clear everything in it before we 2658 * can exit. 2659 */ 2660 if (rwa->err == 0) { 2661 rwa->err = receive_process_record(rwa, rrd); 2662 } else if (rrd->write_buf != NULL) { 2663 dmu_return_arcbuf(rrd->write_buf); 2664 rrd->write_buf = NULL; 2665 rrd->payload = NULL; 2666 } else if (rrd->payload != NULL) { 2667 kmem_free(rrd->payload, rrd->payload_size); 2668 rrd->payload = NULL; 2669 } 2670 kmem_free(rrd, sizeof (*rrd)); 2671 } 2672 kmem_free(rrd, sizeof (*rrd)); 2673 mutex_enter(&rwa->mutex); 2674 rwa->done = B_TRUE; 2675 cv_signal(&rwa->cv); 2676 mutex_exit(&rwa->mutex); 2677 thread_exit(); 2678} 2679 2680static int 2681resume_check(struct receive_arg *ra, nvlist_t *begin_nvl) 2682{ 2683 uint64_t val; 2684 objset_t *mos = dmu_objset_pool(ra->os)->dp_meta_objset; 2685 uint64_t dsobj = dmu_objset_id(ra->os); 2686 uint64_t resume_obj, resume_off; 2687 2688 if (nvlist_lookup_uint64(begin_nvl, 2689 "resume_object", &resume_obj) != 0 || 2690 nvlist_lookup_uint64(begin_nvl, 2691 "resume_offset", &resume_off) != 0) { 2692 return (SET_ERROR(EINVAL)); 2693 } 2694 VERIFY0(zap_lookup(mos, dsobj, 2695 DS_FIELD_RESUME_OBJECT, sizeof (val), 1, &val)); 2696 if (resume_obj != val) 2697 return (SET_ERROR(EINVAL)); 2698 VERIFY0(zap_lookup(mos, dsobj, 2699 DS_FIELD_RESUME_OFFSET, sizeof (val), 1, &val)); 2700 if (resume_off != val) 2701 return (SET_ERROR(EINVAL)); 2702 2703 return (0); 2704} 2705 2706 2707/* 2708 * Read in the stream's records, one by one, and apply them to the pool. There 2709 * are two threads involved; the thread that calls this function will spin up a 2710 * worker thread, read the records off the stream one by one, and issue 2711 * prefetches for any necessary indirect blocks. It will then push the records 2712 * onto an internal blocking queue. The worker thread will pull the records off 2713 * the queue, and actually write the data into the DMU. This way, the worker 2714 * thread doesn't have to wait for reads to complete, since everything it needs 2715 * (the indirect blocks) will be prefetched. 2716 * 2717 * NB: callers *must* call dmu_recv_end() if this succeeds. 2718 */ 2719int 2720dmu_recv_stream(dmu_recv_cookie_t *drc, struct file *fp, offset_t *voffp, 2721 int cleanup_fd, uint64_t *action_handlep) 2722{ 2723 int err = 0; 2724 struct receive_arg ra = { 0 }; 2725 struct receive_writer_arg rwa = { 0 }; 2726 int featureflags; 2727 nvlist_t *begin_nvl = NULL; 2728 2729 ra.byteswap = drc->drc_byteswap; 2730 ra.cksum = drc->drc_cksum; 2731 ra.td = curthread; 2732 ra.fp = fp; 2733 ra.voff = *voffp; 2734 2735 if (dsl_dataset_is_zapified(drc->drc_ds)) { 2736 (void) zap_lookup(drc->drc_ds->ds_dir->dd_pool->dp_meta_objset, 2737 drc->drc_ds->ds_object, DS_FIELD_RESUME_BYTES, 2738 sizeof (ra.bytes_read), 1, &ra.bytes_read); 2739 } 2740 2741 list_create(&ra.ignore_obj_list, sizeof (struct receive_ign_obj_node), 2742 offsetof(struct receive_ign_obj_node, node)); 2743 2744 /* these were verified in dmu_recv_begin */ 2745 ASSERT3U(DMU_GET_STREAM_HDRTYPE(drc->drc_drrb->drr_versioninfo), ==, 2746 DMU_SUBSTREAM); 2747 ASSERT3U(drc->drc_drrb->drr_type, <, DMU_OST_NUMTYPES); 2748 2749 /* 2750 * Open the objset we are modifying. 2751 */ 2752 VERIFY0(dmu_objset_from_ds(drc->drc_ds, &ra.os)); 2753 2754 ASSERT(dsl_dataset_phys(drc->drc_ds)->ds_flags & DS_FLAG_INCONSISTENT); 2755 2756 featureflags = DMU_GET_FEATUREFLAGS(drc->drc_drrb->drr_versioninfo); 2757 2758 /* if this stream is dedup'ed, set up the avl tree for guid mapping */ 2759 if (featureflags & DMU_BACKUP_FEATURE_DEDUP) { 2760 minor_t minor; 2761 2762 if (cleanup_fd == -1) { 2763 ra.err = SET_ERROR(EBADF); 2764 goto out; 2765 } 2766 ra.err = zfs_onexit_fd_hold(cleanup_fd, &minor); 2767 if (ra.err != 0) { 2768 cleanup_fd = -1; 2769 goto out; 2770 } 2771 2772 if (*action_handlep == 0) { 2773 rwa.guid_to_ds_map = 2774 kmem_alloc(sizeof (avl_tree_t), KM_SLEEP); 2775 avl_create(rwa.guid_to_ds_map, guid_compare, 2776 sizeof (guid_map_entry_t), 2777 offsetof(guid_map_entry_t, avlnode)); 2778 err = zfs_onexit_add_cb(minor, 2779 free_guid_map_onexit, rwa.guid_to_ds_map, 2780 action_handlep); 2781 if (ra.err != 0) 2782 goto out; 2783 } else { 2784 err = zfs_onexit_cb_data(minor, *action_handlep, 2785 (void **)&rwa.guid_to_ds_map); 2786 if (ra.err != 0) 2787 goto out; 2788 } 2789 2790 drc->drc_guid_to_ds_map = rwa.guid_to_ds_map; 2791 } 2792 2793 uint32_t payloadlen = drc->drc_drr_begin->drr_payloadlen; 2794 void *payload = NULL; 2795 if (payloadlen != 0) 2796 payload = kmem_alloc(payloadlen, KM_SLEEP); 2797 2798 err = receive_read_payload_and_next_header(&ra, payloadlen, payload); 2799 if (err != 0) { 2800 if (payloadlen != 0) 2801 kmem_free(payload, payloadlen); 2802 goto out; 2803 } 2804 if (payloadlen != 0) { 2805 err = nvlist_unpack(payload, payloadlen, &begin_nvl, KM_SLEEP); 2806 kmem_free(payload, payloadlen); 2807 if (err != 0) 2808 goto out; 2809 } 2810 2811 if (featureflags & DMU_BACKUP_FEATURE_RESUMING) { 2812 err = resume_check(&ra, begin_nvl); 2813 if (err != 0) 2814 goto out; 2815 } 2816 2817 (void) bqueue_init(&rwa.q, zfs_recv_queue_length, 2818 offsetof(struct receive_record_arg, node)); 2819 cv_init(&rwa.cv, NULL, CV_DEFAULT, NULL); 2820 mutex_init(&rwa.mutex, NULL, MUTEX_DEFAULT, NULL); 2821 rwa.os = ra.os; 2822 rwa.byteswap = drc->drc_byteswap; 2823 rwa.resumable = drc->drc_resumable; 2824 2825 (void) thread_create(NULL, 0, receive_writer_thread, &rwa, 0, &p0, 2826 TS_RUN, minclsyspri); 2827 /* 2828 * We're reading rwa.err without locks, which is safe since we are the 2829 * only reader, and the worker thread is the only writer. It's ok if we 2830 * miss a write for an iteration or two of the loop, since the writer 2831 * thread will keep freeing records we send it until we send it an eos 2832 * marker. 2833 * 2834 * We can leave this loop in 3 ways: First, if rwa.err is 2835 * non-zero. In that case, the writer thread will free the rrd we just 2836 * pushed. Second, if we're interrupted; in that case, either it's the 2837 * first loop and ra.rrd was never allocated, or it's later, and ra.rrd 2838 * has been handed off to the writer thread who will free it. Finally, 2839 * if receive_read_record fails or we're at the end of the stream, then 2840 * we free ra.rrd and exit. 2841 */ 2842 while (rwa.err == 0) { 2843 if (issig(JUSTLOOKING) && issig(FORREAL)) { 2844 err = SET_ERROR(EINTR); 2845 break; 2846 } 2847 2848 ASSERT3P(ra.rrd, ==, NULL); 2849 ra.rrd = ra.next_rrd; 2850 ra.next_rrd = NULL; 2851 /* Allocates and loads header into ra.next_rrd */ 2852 err = receive_read_record(&ra); 2853 2854 if (ra.rrd->header.drr_type == DRR_END || err != 0) { 2855 kmem_free(ra.rrd, sizeof (*ra.rrd)); 2856 ra.rrd = NULL; 2857 break; 2858 } 2859 2860 bqueue_enqueue(&rwa.q, ra.rrd, 2861 sizeof (struct receive_record_arg) + ra.rrd->payload_size); 2862 ra.rrd = NULL; 2863 } 2864 if (ra.next_rrd == NULL) 2865 ra.next_rrd = kmem_zalloc(sizeof (*ra.next_rrd), KM_SLEEP); 2866 ra.next_rrd->eos_marker = B_TRUE; 2867 bqueue_enqueue(&rwa.q, ra.next_rrd, 1); 2868 2869 mutex_enter(&rwa.mutex); 2870 while (!rwa.done) { 2871 cv_wait(&rwa.cv, &rwa.mutex); 2872 } 2873 mutex_exit(&rwa.mutex); 2874 2875 cv_destroy(&rwa.cv); 2876 mutex_destroy(&rwa.mutex); 2877 bqueue_destroy(&rwa.q); 2878 if (err == 0) 2879 err = rwa.err; 2880 2881out: 2882 nvlist_free(begin_nvl); 2883 if ((featureflags & DMU_BACKUP_FEATURE_DEDUP) && (cleanup_fd != -1)) 2884 zfs_onexit_fd_rele(cleanup_fd); 2885 2886 if (err != 0) { 2887 /* 2888 * Clean up references. If receive is not resumable, 2889 * destroy what we created, so we don't leave it in 2890 * the inconsistent state. 2891 */ 2892 dmu_recv_cleanup_ds(drc); 2893 } 2894 2895 *voffp = ra.voff; 2896 for (struct receive_ign_obj_node *n = 2897 list_remove_head(&ra.ignore_obj_list); n != NULL; 2898 n = list_remove_head(&ra.ignore_obj_list)) { 2899 kmem_free(n, sizeof (*n)); 2900 } 2901 list_destroy(&ra.ignore_obj_list); 2902 return (err); 2903} 2904 2905static int 2906dmu_recv_end_check(void *arg, dmu_tx_t *tx) 2907{ 2908 dmu_recv_cookie_t *drc = arg; 2909 dsl_pool_t *dp = dmu_tx_pool(tx); 2910 int error; 2911 2912 ASSERT3P(drc->drc_ds->ds_owner, ==, dmu_recv_tag); 2913 2914 if (!drc->drc_newfs) { 2915 dsl_dataset_t *origin_head; 2916 2917 error = dsl_dataset_hold(dp, drc->drc_tofs, FTAG, &origin_head); 2918 if (error != 0) 2919 return (error); 2920 if (drc->drc_force) { 2921 /* 2922 * We will destroy any snapshots in tofs (i.e. before 2923 * origin_head) that are after the origin (which is 2924 * the snap before drc_ds, because drc_ds can not 2925 * have any snaps of its own). 2926 */ 2927 uint64_t obj; 2928 2929 obj = dsl_dataset_phys(origin_head)->ds_prev_snap_obj; 2930 while (obj != 2931 dsl_dataset_phys(drc->drc_ds)->ds_prev_snap_obj) { 2932 dsl_dataset_t *snap; 2933 error = dsl_dataset_hold_obj(dp, obj, FTAG, 2934 &snap); 2935 if (error != 0) 2936 break; 2937 if (snap->ds_dir != origin_head->ds_dir) 2938 error = SET_ERROR(EINVAL); 2939 if (error == 0) { 2940 error = dsl_destroy_snapshot_check_impl( 2941 snap, B_FALSE); 2942 } 2943 obj = dsl_dataset_phys(snap)->ds_prev_snap_obj; 2944 dsl_dataset_rele(snap, FTAG); 2945 if (error != 0) 2946 break; 2947 } 2948 if (error != 0) { 2949 dsl_dataset_rele(origin_head, FTAG); 2950 return (error); 2951 } 2952 } 2953 error = dsl_dataset_clone_swap_check_impl(drc->drc_ds, 2954 origin_head, drc->drc_force, drc->drc_owner, tx); 2955 if (error != 0) { 2956 dsl_dataset_rele(origin_head, FTAG); 2957 return (error); 2958 } 2959 error = dsl_dataset_snapshot_check_impl(origin_head, 2960 drc->drc_tosnap, tx, B_TRUE, 1, drc->drc_cred); 2961 dsl_dataset_rele(origin_head, FTAG); 2962 if (error != 0) 2963 return (error); 2964 2965 error = dsl_destroy_head_check_impl(drc->drc_ds, 1); 2966 } else { 2967 error = dsl_dataset_snapshot_check_impl(drc->drc_ds, 2968 drc->drc_tosnap, tx, B_TRUE, 1, drc->drc_cred); 2969 } 2970 return (error); 2971} 2972 2973static void 2974dmu_recv_end_sync(void *arg, dmu_tx_t *tx) 2975{ 2976 dmu_recv_cookie_t *drc = arg; 2977 dsl_pool_t *dp = dmu_tx_pool(tx); 2978 2979 spa_history_log_internal_ds(drc->drc_ds, "finish receiving", 2980 tx, "snap=%s", drc->drc_tosnap); 2981 2982 if (!drc->drc_newfs) { 2983 dsl_dataset_t *origin_head; 2984 2985 VERIFY0(dsl_dataset_hold(dp, drc->drc_tofs, FTAG, 2986 &origin_head)); 2987 2988 if (drc->drc_force) { 2989 /* 2990 * Destroy any snapshots of drc_tofs (origin_head) 2991 * after the origin (the snap before drc_ds). 2992 */ 2993 uint64_t obj; 2994 2995 obj = dsl_dataset_phys(origin_head)->ds_prev_snap_obj; 2996 while (obj != 2997 dsl_dataset_phys(drc->drc_ds)->ds_prev_snap_obj) { 2998 dsl_dataset_t *snap; 2999 VERIFY0(dsl_dataset_hold_obj(dp, obj, FTAG, 3000 &snap)); 3001 ASSERT3P(snap->ds_dir, ==, origin_head->ds_dir); 3002 obj = dsl_dataset_phys(snap)->ds_prev_snap_obj; 3003 dsl_destroy_snapshot_sync_impl(snap, 3004 B_FALSE, tx); 3005 dsl_dataset_rele(snap, FTAG); 3006 } 3007 } 3008 VERIFY3P(drc->drc_ds->ds_prev, ==, 3009 origin_head->ds_prev); 3010 3011 dsl_dataset_clone_swap_sync_impl(drc->drc_ds, 3012 origin_head, tx); 3013 dsl_dataset_snapshot_sync_impl(origin_head, 3014 drc->drc_tosnap, tx); 3015 3016 /* set snapshot's creation time and guid */ 3017 dmu_buf_will_dirty(origin_head->ds_prev->ds_dbuf, tx); 3018 dsl_dataset_phys(origin_head->ds_prev)->ds_creation_time = 3019 drc->drc_drrb->drr_creation_time; 3020 dsl_dataset_phys(origin_head->ds_prev)->ds_guid = 3021 drc->drc_drrb->drr_toguid; 3022 dsl_dataset_phys(origin_head->ds_prev)->ds_flags &= 3023 ~DS_FLAG_INCONSISTENT; 3024 3025 dmu_buf_will_dirty(origin_head->ds_dbuf, tx); 3026 dsl_dataset_phys(origin_head)->ds_flags &= 3027 ~DS_FLAG_INCONSISTENT; 3028 3029 dsl_dataset_rele(origin_head, FTAG); 3030 dsl_destroy_head_sync_impl(drc->drc_ds, tx); 3031 3032 if (drc->drc_owner != NULL) 3033 VERIFY3P(origin_head->ds_owner, ==, drc->drc_owner); 3034 } else { 3035 dsl_dataset_t *ds = drc->drc_ds; 3036 3037 dsl_dataset_snapshot_sync_impl(ds, drc->drc_tosnap, tx); 3038 3039 /* set snapshot's creation time and guid */ 3040 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 3041 dsl_dataset_phys(ds->ds_prev)->ds_creation_time = 3042 drc->drc_drrb->drr_creation_time; 3043 dsl_dataset_phys(ds->ds_prev)->ds_guid = 3044 drc->drc_drrb->drr_toguid; 3045 dsl_dataset_phys(ds->ds_prev)->ds_flags &= 3046 ~DS_FLAG_INCONSISTENT; 3047 3048 dmu_buf_will_dirty(ds->ds_dbuf, tx); 3049 dsl_dataset_phys(ds)->ds_flags &= ~DS_FLAG_INCONSISTENT; 3050 if (dsl_dataset_has_resume_receive_state(ds)) { 3051 (void) zap_remove(dp->dp_meta_objset, ds->ds_object, 3052 DS_FIELD_RESUME_FROMGUID, tx); 3053 (void) zap_remove(dp->dp_meta_objset, ds->ds_object, 3054 DS_FIELD_RESUME_OBJECT, tx); 3055 (void) zap_remove(dp->dp_meta_objset, ds->ds_object, 3056 DS_FIELD_RESUME_OFFSET, tx); 3057 (void) zap_remove(dp->dp_meta_objset, ds->ds_object, 3058 DS_FIELD_RESUME_BYTES, tx); 3059 (void) zap_remove(dp->dp_meta_objset, ds->ds_object, 3060 DS_FIELD_RESUME_TOGUID, tx); 3061 (void) zap_remove(dp->dp_meta_objset, ds->ds_object, 3062 DS_FIELD_RESUME_TONAME, tx); 3063 } 3064 } 3065 drc->drc_newsnapobj = dsl_dataset_phys(drc->drc_ds)->ds_prev_snap_obj; 3066 /* 3067 * Release the hold from dmu_recv_begin. This must be done before 3068 * we return to open context, so that when we free the dataset's dnode, 3069 * we can evict its bonus buffer. 3070 */ 3071 dsl_dataset_disown(drc->drc_ds, dmu_recv_tag); 3072 drc->drc_ds = NULL; 3073} 3074 3075static int 3076add_ds_to_guidmap(const char *name, avl_tree_t *guid_map, uint64_t snapobj) 3077{ 3078 dsl_pool_t *dp; 3079 dsl_dataset_t *snapds; 3080 guid_map_entry_t *gmep; 3081 int err; 3082 3083 ASSERT(guid_map != NULL); 3084 3085 err = dsl_pool_hold(name, FTAG, &dp); 3086 if (err != 0) 3087 return (err); 3088 gmep = kmem_alloc(sizeof (*gmep), KM_SLEEP); 3089 err = dsl_dataset_hold_obj(dp, snapobj, gmep, &snapds); 3090 if (err == 0) { 3091 gmep->guid = dsl_dataset_phys(snapds)->ds_guid; 3092 gmep->gme_ds = snapds; 3093 avl_add(guid_map, gmep); 3094 dsl_dataset_long_hold(snapds, gmep); 3095 } else 3096 kmem_free(gmep, sizeof (*gmep)); 3097 3098 dsl_pool_rele(dp, FTAG); 3099 return (err); 3100} 3101 3102static int dmu_recv_end_modified_blocks = 3; 3103 3104static int 3105dmu_recv_existing_end(dmu_recv_cookie_t *drc) 3106{ 3107 int error; 3108 char name[MAXNAMELEN]; 3109 3110#ifdef _KERNEL 3111 /* 3112 * We will be destroying the ds; make sure its origin is unmounted if 3113 * necessary. 3114 */ 3115 dsl_dataset_name(drc->drc_ds, name); 3116 zfs_destroy_unmount_origin(name); 3117#endif 3118 3119 error = dsl_sync_task(drc->drc_tofs, 3120 dmu_recv_end_check, dmu_recv_end_sync, drc, 3121 dmu_recv_end_modified_blocks, ZFS_SPACE_CHECK_NORMAL); 3122 3123 if (error != 0) 3124 dmu_recv_cleanup_ds(drc); 3125 return (error); 3126} 3127 3128static int 3129dmu_recv_new_end(dmu_recv_cookie_t *drc) 3130{ 3131 int error; 3132 3133 error = dsl_sync_task(drc->drc_tofs, 3134 dmu_recv_end_check, dmu_recv_end_sync, drc, 3135 dmu_recv_end_modified_blocks, ZFS_SPACE_CHECK_NORMAL); 3136 3137 if (error != 0) { 3138 dmu_recv_cleanup_ds(drc); 3139 } else if (drc->drc_guid_to_ds_map != NULL) { 3140 (void) add_ds_to_guidmap(drc->drc_tofs, 3141 drc->drc_guid_to_ds_map, 3142 drc->drc_newsnapobj); 3143 } 3144 return (error); 3145} 3146 3147int 3148dmu_recv_end(dmu_recv_cookie_t *drc, void *owner) 3149{ 3150 drc->drc_owner = owner; 3151 3152 if (drc->drc_newfs) 3153 return (dmu_recv_new_end(drc)); 3154 else 3155 return (dmu_recv_existing_end(drc)); 3156} 3157 3158/* 3159 * Return TRUE if this objset is currently being received into. 3160 */ 3161boolean_t 3162dmu_objset_is_receiving(objset_t *os) 3163{ 3164 return (os->os_dsl_dataset != NULL && 3165 os->os_dsl_dataset->ds_owner == dmu_recv_tag); 3166} 3167