dmu_send.c revision 290757
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_flags & 296 ZCHECKSUM_FLAG_DEDUP) 297 drrw->drr_checksumflags |= DRR_CHECKSUM_DEDUP; 298 DDK_SET_LSIZE(&drrw->drr_key, BP_GET_LSIZE(bp)); 299 DDK_SET_PSIZE(&drrw->drr_key, BP_GET_PSIZE(bp)); 300 DDK_SET_COMPRESS(&drrw->drr_key, BP_GET_COMPRESS(bp)); 301 drrw->drr_key.ddk_cksum = bp->blk_cksum; 302 } 303 304 if (dump_record(dsp, data, blksz) != 0) 305 return (SET_ERROR(EINTR)); 306 return (0); 307} 308 309static int 310dump_write_embedded(dmu_sendarg_t *dsp, uint64_t object, uint64_t offset, 311 int blksz, const blkptr_t *bp) 312{ 313 char buf[BPE_PAYLOAD_SIZE]; 314 struct drr_write_embedded *drrw = 315 &(dsp->dsa_drr->drr_u.drr_write_embedded); 316 317 if (dsp->dsa_pending_op != PENDING_NONE) { 318 if (dump_record(dsp, NULL, 0) != 0) 319 return (EINTR); 320 dsp->dsa_pending_op = PENDING_NONE; 321 } 322 323 ASSERT(BP_IS_EMBEDDED(bp)); 324 325 bzero(dsp->dsa_drr, sizeof (dmu_replay_record_t)); 326 dsp->dsa_drr->drr_type = DRR_WRITE_EMBEDDED; 327 drrw->drr_object = object; 328 drrw->drr_offset = offset; 329 drrw->drr_length = blksz; 330 drrw->drr_toguid = dsp->dsa_toguid; 331 drrw->drr_compression = BP_GET_COMPRESS(bp); 332 drrw->drr_etype = BPE_GET_ETYPE(bp); 333 drrw->drr_lsize = BPE_GET_LSIZE(bp); 334 drrw->drr_psize = BPE_GET_PSIZE(bp); 335 336 decode_embedded_bp_compressed(bp, buf); 337 338 if (dump_record(dsp, buf, P2ROUNDUP(drrw->drr_psize, 8)) != 0) 339 return (EINTR); 340 return (0); 341} 342 343static int 344dump_spill(dmu_sendarg_t *dsp, uint64_t object, int blksz, void *data) 345{ 346 struct drr_spill *drrs = &(dsp->dsa_drr->drr_u.drr_spill); 347 348 if (dsp->dsa_pending_op != PENDING_NONE) { 349 if (dump_record(dsp, NULL, 0) != 0) 350 return (SET_ERROR(EINTR)); 351 dsp->dsa_pending_op = PENDING_NONE; 352 } 353 354 /* write a SPILL record */ 355 bzero(dsp->dsa_drr, sizeof (dmu_replay_record_t)); 356 dsp->dsa_drr->drr_type = DRR_SPILL; 357 drrs->drr_object = object; 358 drrs->drr_length = blksz; 359 drrs->drr_toguid = dsp->dsa_toguid; 360 361 if (dump_record(dsp, data, blksz) != 0) 362 return (SET_ERROR(EINTR)); 363 return (0); 364} 365 366static int 367dump_freeobjects(dmu_sendarg_t *dsp, uint64_t firstobj, uint64_t numobjs) 368{ 369 struct drr_freeobjects *drrfo = &(dsp->dsa_drr->drr_u.drr_freeobjects); 370 371 /* See comment in dump_free(). */ 372 if (!dsp->dsa_incremental) 373 return (0); 374 375 /* 376 * If there is a pending op, but it's not PENDING_FREEOBJECTS, 377 * push it out, since free block aggregation can only be done for 378 * blocks of the same type (i.e., DRR_FREE records can only be 379 * aggregated with other DRR_FREE records. DRR_FREEOBJECTS records 380 * can only be aggregated with other DRR_FREEOBJECTS records. 381 */ 382 if (dsp->dsa_pending_op != PENDING_NONE && 383 dsp->dsa_pending_op != PENDING_FREEOBJECTS) { 384 if (dump_record(dsp, NULL, 0) != 0) 385 return (SET_ERROR(EINTR)); 386 dsp->dsa_pending_op = PENDING_NONE; 387 } 388 if (dsp->dsa_pending_op == PENDING_FREEOBJECTS) { 389 /* 390 * See whether this free object array can be aggregated 391 * with pending one 392 */ 393 if (drrfo->drr_firstobj + drrfo->drr_numobjs == firstobj) { 394 drrfo->drr_numobjs += numobjs; 395 return (0); 396 } else { 397 /* can't be aggregated. Push out pending record */ 398 if (dump_record(dsp, NULL, 0) != 0) 399 return (SET_ERROR(EINTR)); 400 dsp->dsa_pending_op = PENDING_NONE; 401 } 402 } 403 404 /* write a FREEOBJECTS record */ 405 bzero(dsp->dsa_drr, sizeof (dmu_replay_record_t)); 406 dsp->dsa_drr->drr_type = DRR_FREEOBJECTS; 407 drrfo->drr_firstobj = firstobj; 408 drrfo->drr_numobjs = numobjs; 409 drrfo->drr_toguid = dsp->dsa_toguid; 410 411 dsp->dsa_pending_op = PENDING_FREEOBJECTS; 412 413 return (0); 414} 415 416static int 417dump_dnode(dmu_sendarg_t *dsp, uint64_t object, dnode_phys_t *dnp) 418{ 419 struct drr_object *drro = &(dsp->dsa_drr->drr_u.drr_object); 420 421 if (object < dsp->dsa_resume_object) { 422 /* 423 * Note: when resuming, we will visit all the dnodes in 424 * the block of dnodes that we are resuming from. In 425 * this case it's unnecessary to send the dnodes prior to 426 * the one we are resuming from. We should be at most one 427 * block's worth of dnodes behind the resume point. 428 */ 429 ASSERT3U(dsp->dsa_resume_object - object, <, 430 1 << (DNODE_BLOCK_SHIFT - DNODE_SHIFT)); 431 return (0); 432 } 433 434 if (dnp == NULL || dnp->dn_type == DMU_OT_NONE) 435 return (dump_freeobjects(dsp, object, 1)); 436 437 if (dsp->dsa_pending_op != PENDING_NONE) { 438 if (dump_record(dsp, NULL, 0) != 0) 439 return (SET_ERROR(EINTR)); 440 dsp->dsa_pending_op = PENDING_NONE; 441 } 442 443 /* write an OBJECT record */ 444 bzero(dsp->dsa_drr, sizeof (dmu_replay_record_t)); 445 dsp->dsa_drr->drr_type = DRR_OBJECT; 446 drro->drr_object = object; 447 drro->drr_type = dnp->dn_type; 448 drro->drr_bonustype = dnp->dn_bonustype; 449 drro->drr_blksz = dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT; 450 drro->drr_bonuslen = dnp->dn_bonuslen; 451 drro->drr_checksumtype = dnp->dn_checksum; 452 drro->drr_compress = dnp->dn_compress; 453 drro->drr_toguid = dsp->dsa_toguid; 454 455 if (!(dsp->dsa_featureflags & DMU_BACKUP_FEATURE_LARGE_BLOCKS) && 456 drro->drr_blksz > SPA_OLD_MAXBLOCKSIZE) 457 drro->drr_blksz = SPA_OLD_MAXBLOCKSIZE; 458 459 if (dump_record(dsp, DN_BONUS(dnp), 460 P2ROUNDUP(dnp->dn_bonuslen, 8)) != 0) { 461 return (SET_ERROR(EINTR)); 462 } 463 464 /* Free anything past the end of the file. */ 465 if (dump_free(dsp, object, (dnp->dn_maxblkid + 1) * 466 (dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT), -1ULL) != 0) 467 return (SET_ERROR(EINTR)); 468 if (dsp->dsa_err != 0) 469 return (SET_ERROR(EINTR)); 470 return (0); 471} 472 473static boolean_t 474backup_do_embed(dmu_sendarg_t *dsp, const blkptr_t *bp) 475{ 476 if (!BP_IS_EMBEDDED(bp)) 477 return (B_FALSE); 478 479 /* 480 * Compression function must be legacy, or explicitly enabled. 481 */ 482 if ((BP_GET_COMPRESS(bp) >= ZIO_COMPRESS_LEGACY_FUNCTIONS && 483 !(dsp->dsa_featureflags & DMU_BACKUP_FEATURE_EMBED_DATA_LZ4))) 484 return (B_FALSE); 485 486 /* 487 * Embed type must be explicitly enabled. 488 */ 489 switch (BPE_GET_ETYPE(bp)) { 490 case BP_EMBEDDED_TYPE_DATA: 491 if (dsp->dsa_featureflags & DMU_BACKUP_FEATURE_EMBED_DATA) 492 return (B_TRUE); 493 break; 494 default: 495 return (B_FALSE); 496 } 497 return (B_FALSE); 498} 499 500/* 501 * This is the callback function to traverse_dataset that acts as the worker 502 * thread for dmu_send_impl. 503 */ 504/*ARGSUSED*/ 505static int 506send_cb(spa_t *spa, zilog_t *zilog, const blkptr_t *bp, 507 const zbookmark_phys_t *zb, const struct dnode_phys *dnp, void *arg) 508{ 509 struct send_thread_arg *sta = arg; 510 struct send_block_record *record; 511 uint64_t record_size; 512 int err = 0; 513 514 ASSERT(zb->zb_object == DMU_META_DNODE_OBJECT || 515 zb->zb_object >= sta->resume.zb_object); 516 517 if (sta->cancel) 518 return (SET_ERROR(EINTR)); 519 520 if (bp == NULL) { 521 ASSERT3U(zb->zb_level, ==, ZB_DNODE_LEVEL); 522 return (0); 523 } else if (zb->zb_level < 0) { 524 return (0); 525 } 526 527 record = kmem_zalloc(sizeof (struct send_block_record), KM_SLEEP); 528 record->eos_marker = B_FALSE; 529 record->bp = *bp; 530 record->zb = *zb; 531 record->indblkshift = dnp->dn_indblkshift; 532 record->datablkszsec = dnp->dn_datablkszsec; 533 record_size = dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT; 534 bqueue_enqueue(&sta->q, record, record_size); 535 536 return (err); 537} 538 539/* 540 * This function kicks off the traverse_dataset. It also handles setting the 541 * error code of the thread in case something goes wrong, and pushes the End of 542 * Stream record when the traverse_dataset call has finished. If there is no 543 * dataset to traverse, the thread immediately pushes End of Stream marker. 544 */ 545static void 546send_traverse_thread(void *arg) 547{ 548 struct send_thread_arg *st_arg = arg; 549 int err; 550 struct send_block_record *data; 551 552 if (st_arg->ds != NULL) { 553 err = traverse_dataset_resume(st_arg->ds, 554 st_arg->fromtxg, &st_arg->resume, 555 st_arg->flags, send_cb, st_arg); 556 557 if (err != EINTR) 558 st_arg->error_code = err; 559 } 560 data = kmem_zalloc(sizeof (*data), KM_SLEEP); 561 data->eos_marker = B_TRUE; 562 bqueue_enqueue(&st_arg->q, data, 1); 563 thread_exit(); 564} 565 566/* 567 * This function actually handles figuring out what kind of record needs to be 568 * dumped, reading the data (which has hopefully been prefetched), and calling 569 * the appropriate helper function. 570 */ 571static int 572do_dump(dmu_sendarg_t *dsa, struct send_block_record *data) 573{ 574 dsl_dataset_t *ds = dmu_objset_ds(dsa->dsa_os); 575 const blkptr_t *bp = &data->bp; 576 const zbookmark_phys_t *zb = &data->zb; 577 uint8_t indblkshift = data->indblkshift; 578 uint16_t dblkszsec = data->datablkszsec; 579 spa_t *spa = ds->ds_dir->dd_pool->dp_spa; 580 dmu_object_type_t type = bp ? BP_GET_TYPE(bp) : DMU_OT_NONE; 581 int err = 0; 582 583 ASSERT3U(zb->zb_level, >=, 0); 584 585 ASSERT(zb->zb_object == DMU_META_DNODE_OBJECT || 586 zb->zb_object >= dsa->dsa_resume_object); 587 588 if (zb->zb_object != DMU_META_DNODE_OBJECT && 589 DMU_OBJECT_IS_SPECIAL(zb->zb_object)) { 590 return (0); 591 } else if (BP_IS_HOLE(bp) && 592 zb->zb_object == DMU_META_DNODE_OBJECT) { 593 uint64_t span = BP_SPAN(dblkszsec, indblkshift, zb->zb_level); 594 uint64_t dnobj = (zb->zb_blkid * span) >> DNODE_SHIFT; 595 err = dump_freeobjects(dsa, dnobj, span >> DNODE_SHIFT); 596 } else if (BP_IS_HOLE(bp)) { 597 uint64_t span = BP_SPAN(dblkszsec, indblkshift, zb->zb_level); 598 uint64_t offset = zb->zb_blkid * span; 599 err = dump_free(dsa, zb->zb_object, offset, span); 600 } else if (zb->zb_level > 0 || type == DMU_OT_OBJSET) { 601 return (0); 602 } else if (type == DMU_OT_DNODE) { 603 int blksz = BP_GET_LSIZE(bp); 604 arc_flags_t aflags = ARC_FLAG_WAIT; 605 arc_buf_t *abuf; 606 607 ASSERT0(zb->zb_level); 608 609 if (arc_read(NULL, spa, bp, arc_getbuf_func, &abuf, 610 ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, 611 &aflags, zb) != 0) 612 return (SET_ERROR(EIO)); 613 614 dnode_phys_t *blk = abuf->b_data; 615 uint64_t dnobj = zb->zb_blkid * (blksz >> DNODE_SHIFT); 616 for (int i = 0; i < blksz >> DNODE_SHIFT; i++) { 617 err = dump_dnode(dsa, dnobj + i, blk + i); 618 if (err != 0) 619 break; 620 } 621 (void) arc_buf_remove_ref(abuf, &abuf); 622 } else if (type == DMU_OT_SA) { 623 arc_flags_t aflags = ARC_FLAG_WAIT; 624 arc_buf_t *abuf; 625 int blksz = BP_GET_LSIZE(bp); 626 627 if (arc_read(NULL, spa, bp, arc_getbuf_func, &abuf, 628 ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, 629 &aflags, zb) != 0) 630 return (SET_ERROR(EIO)); 631 632 err = dump_spill(dsa, zb->zb_object, blksz, abuf->b_data); 633 (void) arc_buf_remove_ref(abuf, &abuf); 634 } else if (backup_do_embed(dsa, bp)) { 635 /* it's an embedded level-0 block of a regular object */ 636 int blksz = dblkszsec << SPA_MINBLOCKSHIFT; 637 ASSERT0(zb->zb_level); 638 err = dump_write_embedded(dsa, zb->zb_object, 639 zb->zb_blkid * blksz, blksz, bp); 640 } else { 641 /* it's a level-0 block of a regular object */ 642 arc_flags_t aflags = ARC_FLAG_WAIT; 643 arc_buf_t *abuf; 644 int blksz = dblkszsec << SPA_MINBLOCKSHIFT; 645 uint64_t offset; 646 647 ASSERT0(zb->zb_level); 648 ASSERT(zb->zb_object > dsa->dsa_resume_object || 649 (zb->zb_object == dsa->dsa_resume_object && 650 zb->zb_blkid * blksz >= dsa->dsa_resume_offset)); 651 652 if (arc_read(NULL, spa, bp, arc_getbuf_func, &abuf, 653 ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, 654 &aflags, zb) != 0) { 655 if (zfs_send_corrupt_data) { 656 /* Send a block filled with 0x"zfs badd bloc" */ 657 abuf = arc_buf_alloc(spa, blksz, &abuf, 658 ARC_BUFC_DATA); 659 uint64_t *ptr; 660 for (ptr = abuf->b_data; 661 (char *)ptr < (char *)abuf->b_data + blksz; 662 ptr++) 663 *ptr = 0x2f5baddb10cULL; 664 } else { 665 return (SET_ERROR(EIO)); 666 } 667 } 668 669 offset = zb->zb_blkid * blksz; 670 671 if (!(dsa->dsa_featureflags & 672 DMU_BACKUP_FEATURE_LARGE_BLOCKS) && 673 blksz > SPA_OLD_MAXBLOCKSIZE) { 674 char *buf = abuf->b_data; 675 while (blksz > 0 && err == 0) { 676 int n = MIN(blksz, SPA_OLD_MAXBLOCKSIZE); 677 err = dump_write(dsa, type, zb->zb_object, 678 offset, n, NULL, buf); 679 offset += n; 680 buf += n; 681 blksz -= n; 682 } 683 } else { 684 err = dump_write(dsa, type, zb->zb_object, 685 offset, blksz, bp, abuf->b_data); 686 } 687 (void) arc_buf_remove_ref(abuf, &abuf); 688 } 689 690 ASSERT(err == 0 || err == EINTR); 691 return (err); 692} 693 694/* 695 * Pop the new data off the queue, and free the old data. 696 */ 697static struct send_block_record * 698get_next_record(bqueue_t *bq, struct send_block_record *data) 699{ 700 struct send_block_record *tmp = bqueue_dequeue(bq); 701 kmem_free(data, sizeof (*data)); 702 return (tmp); 703} 704 705/* 706 * Actually do the bulk of the work in a zfs send. 707 * 708 * Note: Releases dp using the specified tag. 709 */ 710static int 711dmu_send_impl(void *tag, dsl_pool_t *dp, dsl_dataset_t *to_ds, 712 zfs_bookmark_phys_t *ancestor_zb, 713 boolean_t is_clone, boolean_t embedok, boolean_t large_block_ok, int outfd, 714 uint64_t resumeobj, uint64_t resumeoff, 715#ifdef illumos 716 vnode_t *vp, offset_t *off) 717#else 718 struct file *fp, offset_t *off) 719#endif 720{ 721 objset_t *os; 722 dmu_replay_record_t *drr; 723 dmu_sendarg_t *dsp; 724 int err; 725 uint64_t fromtxg = 0; 726 uint64_t featureflags = 0; 727 struct send_thread_arg to_arg = { 0 }; 728 729 err = dmu_objset_from_ds(to_ds, &os); 730 if (err != 0) { 731 dsl_pool_rele(dp, tag); 732 return (err); 733 } 734 735 drr = kmem_zalloc(sizeof (dmu_replay_record_t), KM_SLEEP); 736 drr->drr_type = DRR_BEGIN; 737 drr->drr_u.drr_begin.drr_magic = DMU_BACKUP_MAGIC; 738 DMU_SET_STREAM_HDRTYPE(drr->drr_u.drr_begin.drr_versioninfo, 739 DMU_SUBSTREAM); 740 741#ifdef _KERNEL 742 if (dmu_objset_type(os) == DMU_OST_ZFS) { 743 uint64_t version; 744 if (zfs_get_zplprop(os, ZFS_PROP_VERSION, &version) != 0) { 745 kmem_free(drr, sizeof (dmu_replay_record_t)); 746 dsl_pool_rele(dp, tag); 747 return (SET_ERROR(EINVAL)); 748 } 749 if (version >= ZPL_VERSION_SA) { 750 featureflags |= DMU_BACKUP_FEATURE_SA_SPILL; 751 } 752 } 753#endif 754 755 if (large_block_ok && to_ds->ds_feature_inuse[SPA_FEATURE_LARGE_BLOCKS]) 756 featureflags |= DMU_BACKUP_FEATURE_LARGE_BLOCKS; 757 if (embedok && 758 spa_feature_is_active(dp->dp_spa, SPA_FEATURE_EMBEDDED_DATA)) { 759 featureflags |= DMU_BACKUP_FEATURE_EMBED_DATA; 760 if (spa_feature_is_active(dp->dp_spa, SPA_FEATURE_LZ4_COMPRESS)) 761 featureflags |= DMU_BACKUP_FEATURE_EMBED_DATA_LZ4; 762 } 763 764 if (resumeobj != 0 || resumeoff != 0) { 765 featureflags |= DMU_BACKUP_FEATURE_RESUMING; 766 } 767 768 DMU_SET_FEATUREFLAGS(drr->drr_u.drr_begin.drr_versioninfo, 769 featureflags); 770 771 drr->drr_u.drr_begin.drr_creation_time = 772 dsl_dataset_phys(to_ds)->ds_creation_time; 773 drr->drr_u.drr_begin.drr_type = dmu_objset_type(os); 774 if (is_clone) 775 drr->drr_u.drr_begin.drr_flags |= DRR_FLAG_CLONE; 776 drr->drr_u.drr_begin.drr_toguid = dsl_dataset_phys(to_ds)->ds_guid; 777 if (dsl_dataset_phys(to_ds)->ds_flags & DS_FLAG_CI_DATASET) 778 drr->drr_u.drr_begin.drr_flags |= DRR_FLAG_CI_DATA; 779 780 if (ancestor_zb != NULL) { 781 drr->drr_u.drr_begin.drr_fromguid = 782 ancestor_zb->zbm_guid; 783 fromtxg = ancestor_zb->zbm_creation_txg; 784 } 785 dsl_dataset_name(to_ds, drr->drr_u.drr_begin.drr_toname); 786 if (!to_ds->ds_is_snapshot) { 787 (void) strlcat(drr->drr_u.drr_begin.drr_toname, "@--head--", 788 sizeof (drr->drr_u.drr_begin.drr_toname)); 789 } 790 791 dsp = kmem_zalloc(sizeof (dmu_sendarg_t), KM_SLEEP); 792 793 dsp->dsa_drr = drr; 794 dsp->dsa_outfd = outfd; 795 dsp->dsa_proc = curproc; 796 dsp->dsa_td = curthread; 797 dsp->dsa_fp = fp; 798 dsp->dsa_os = os; 799 dsp->dsa_off = off; 800 dsp->dsa_toguid = dsl_dataset_phys(to_ds)->ds_guid; 801 dsp->dsa_pending_op = PENDING_NONE; 802 dsp->dsa_incremental = (ancestor_zb != NULL); 803 dsp->dsa_featureflags = featureflags; 804 dsp->dsa_resume_object = resumeobj; 805 dsp->dsa_resume_offset = resumeoff; 806 807 mutex_enter(&to_ds->ds_sendstream_lock); 808 list_insert_head(&to_ds->ds_sendstreams, dsp); 809 mutex_exit(&to_ds->ds_sendstream_lock); 810 811 dsl_dataset_long_hold(to_ds, FTAG); 812 dsl_pool_rele(dp, tag); 813 814 void *payload = NULL; 815 size_t payload_len = 0; 816 if (resumeobj != 0 || resumeoff != 0) { 817 dmu_object_info_t to_doi; 818 err = dmu_object_info(os, resumeobj, &to_doi); 819 if (err != 0) 820 goto out; 821 SET_BOOKMARK(&to_arg.resume, to_ds->ds_object, resumeobj, 0, 822 resumeoff / to_doi.doi_data_block_size); 823 824 nvlist_t *nvl = fnvlist_alloc(); 825 fnvlist_add_uint64(nvl, "resume_object", resumeobj); 826 fnvlist_add_uint64(nvl, "resume_offset", resumeoff); 827 payload = fnvlist_pack(nvl, &payload_len); 828 drr->drr_payloadlen = payload_len; 829 fnvlist_free(nvl); 830 } 831 832 err = dump_record(dsp, payload, payload_len); 833 fnvlist_pack_free(payload, payload_len); 834 if (err != 0) { 835 err = dsp->dsa_err; 836 goto out; 837 } 838 839 err = bqueue_init(&to_arg.q, zfs_send_queue_length, 840 offsetof(struct send_block_record, ln)); 841 to_arg.error_code = 0; 842 to_arg.cancel = B_FALSE; 843 to_arg.ds = to_ds; 844 to_arg.fromtxg = fromtxg; 845 to_arg.flags = TRAVERSE_PRE | TRAVERSE_PREFETCH; 846 (void) thread_create(NULL, 0, send_traverse_thread, &to_arg, 0, &p0, 847 TS_RUN, minclsyspri); 848 849 struct send_block_record *to_data; 850 to_data = bqueue_dequeue(&to_arg.q); 851 852 while (!to_data->eos_marker && err == 0) { 853 err = do_dump(dsp, to_data); 854 to_data = get_next_record(&to_arg.q, to_data); 855 if (issig(JUSTLOOKING) && issig(FORREAL)) 856 err = EINTR; 857 } 858 859 if (err != 0) { 860 to_arg.cancel = B_TRUE; 861 while (!to_data->eos_marker) { 862 to_data = get_next_record(&to_arg.q, to_data); 863 } 864 } 865 kmem_free(to_data, sizeof (*to_data)); 866 867 bqueue_destroy(&to_arg.q); 868 869 if (err == 0 && to_arg.error_code != 0) 870 err = to_arg.error_code; 871 872 if (err != 0) 873 goto out; 874 875 if (dsp->dsa_pending_op != PENDING_NONE) 876 if (dump_record(dsp, NULL, 0) != 0) 877 err = SET_ERROR(EINTR); 878 879 if (err != 0) { 880 if (err == EINTR && dsp->dsa_err != 0) 881 err = dsp->dsa_err; 882 goto out; 883 } 884 885 bzero(drr, sizeof (dmu_replay_record_t)); 886 drr->drr_type = DRR_END; 887 drr->drr_u.drr_end.drr_checksum = dsp->dsa_zc; 888 drr->drr_u.drr_end.drr_toguid = dsp->dsa_toguid; 889 890 if (dump_record(dsp, NULL, 0) != 0) 891 err = dsp->dsa_err; 892 893out: 894 mutex_enter(&to_ds->ds_sendstream_lock); 895 list_remove(&to_ds->ds_sendstreams, dsp); 896 mutex_exit(&to_ds->ds_sendstream_lock); 897 898 kmem_free(drr, sizeof (dmu_replay_record_t)); 899 kmem_free(dsp, sizeof (dmu_sendarg_t)); 900 901 dsl_dataset_long_rele(to_ds, FTAG); 902 903 return (err); 904} 905 906int 907dmu_send_obj(const char *pool, uint64_t tosnap, uint64_t fromsnap, 908 boolean_t embedok, boolean_t large_block_ok, 909#ifdef illumos 910 int outfd, vnode_t *vp, offset_t *off) 911#else 912 int outfd, struct file *fp, offset_t *off) 913#endif 914{ 915 dsl_pool_t *dp; 916 dsl_dataset_t *ds; 917 dsl_dataset_t *fromds = NULL; 918 int err; 919 920 err = dsl_pool_hold(pool, FTAG, &dp); 921 if (err != 0) 922 return (err); 923 924 err = dsl_dataset_hold_obj(dp, tosnap, FTAG, &ds); 925 if (err != 0) { 926 dsl_pool_rele(dp, FTAG); 927 return (err); 928 } 929 930 if (fromsnap != 0) { 931 zfs_bookmark_phys_t zb; 932 boolean_t is_clone; 933 934 err = dsl_dataset_hold_obj(dp, fromsnap, FTAG, &fromds); 935 if (err != 0) { 936 dsl_dataset_rele(ds, FTAG); 937 dsl_pool_rele(dp, FTAG); 938 return (err); 939 } 940 if (!dsl_dataset_is_before(ds, fromds, 0)) 941 err = SET_ERROR(EXDEV); 942 zb.zbm_creation_time = 943 dsl_dataset_phys(fromds)->ds_creation_time; 944 zb.zbm_creation_txg = dsl_dataset_phys(fromds)->ds_creation_txg; 945 zb.zbm_guid = dsl_dataset_phys(fromds)->ds_guid; 946 is_clone = (fromds->ds_dir != ds->ds_dir); 947 dsl_dataset_rele(fromds, FTAG); 948 err = dmu_send_impl(FTAG, dp, ds, &zb, is_clone, 949 embedok, large_block_ok, outfd, 0, 0, fp, off); 950 } else { 951 err = dmu_send_impl(FTAG, dp, ds, NULL, B_FALSE, 952 embedok, large_block_ok, outfd, 0, 0, fp, off); 953 } 954 dsl_dataset_rele(ds, FTAG); 955 return (err); 956} 957 958int 959dmu_send(const char *tosnap, const char *fromsnap, boolean_t embedok, 960 boolean_t large_block_ok, int outfd, uint64_t resumeobj, uint64_t resumeoff, 961#ifdef illumos 962 vnode_t *vp, offset_t *off) 963#else 964 struct file *fp, offset_t *off) 965#endif 966{ 967 dsl_pool_t *dp; 968 dsl_dataset_t *ds; 969 int err; 970 boolean_t owned = B_FALSE; 971 972 if (fromsnap != NULL && strpbrk(fromsnap, "@#") == NULL) 973 return (SET_ERROR(EINVAL)); 974 975 err = dsl_pool_hold(tosnap, FTAG, &dp); 976 if (err != 0) 977 return (err); 978 979 if (strchr(tosnap, '@') == NULL && spa_writeable(dp->dp_spa)) { 980 /* 981 * We are sending a filesystem or volume. Ensure 982 * that it doesn't change by owning the dataset. 983 */ 984 err = dsl_dataset_own(dp, tosnap, FTAG, &ds); 985 owned = B_TRUE; 986 } else { 987 err = dsl_dataset_hold(dp, tosnap, FTAG, &ds); 988 } 989 if (err != 0) { 990 dsl_pool_rele(dp, FTAG); 991 return (err); 992 } 993 994 if (fromsnap != NULL) { 995 zfs_bookmark_phys_t zb; 996 boolean_t is_clone = B_FALSE; 997 int fsnamelen = strchr(tosnap, '@') - tosnap; 998 999 /* 1000 * If the fromsnap is in a different filesystem, then 1001 * mark the send stream as a clone. 1002 */ 1003 if (strncmp(tosnap, fromsnap, fsnamelen) != 0 || 1004 (fromsnap[fsnamelen] != '@' && 1005 fromsnap[fsnamelen] != '#')) { 1006 is_clone = B_TRUE; 1007 } 1008 1009 if (strchr(fromsnap, '@')) { 1010 dsl_dataset_t *fromds; 1011 err = dsl_dataset_hold(dp, fromsnap, FTAG, &fromds); 1012 if (err == 0) { 1013 if (!dsl_dataset_is_before(ds, fromds, 0)) 1014 err = SET_ERROR(EXDEV); 1015 zb.zbm_creation_time = 1016 dsl_dataset_phys(fromds)->ds_creation_time; 1017 zb.zbm_creation_txg = 1018 dsl_dataset_phys(fromds)->ds_creation_txg; 1019 zb.zbm_guid = dsl_dataset_phys(fromds)->ds_guid; 1020 is_clone = (ds->ds_dir != fromds->ds_dir); 1021 dsl_dataset_rele(fromds, FTAG); 1022 } 1023 } else { 1024 err = dsl_bookmark_lookup(dp, fromsnap, ds, &zb); 1025 } 1026 if (err != 0) { 1027 dsl_dataset_rele(ds, FTAG); 1028 dsl_pool_rele(dp, FTAG); 1029 return (err); 1030 } 1031 err = dmu_send_impl(FTAG, dp, ds, &zb, is_clone, 1032 embedok, large_block_ok, 1033 outfd, resumeobj, resumeoff, fp, off); 1034 } else { 1035 err = dmu_send_impl(FTAG, dp, ds, NULL, B_FALSE, 1036 embedok, large_block_ok, 1037 outfd, resumeobj, resumeoff, fp, off); 1038 } 1039 if (owned) 1040 dsl_dataset_disown(ds, FTAG); 1041 else 1042 dsl_dataset_rele(ds, FTAG); 1043 return (err); 1044} 1045 1046static int 1047dmu_adjust_send_estimate_for_indirects(dsl_dataset_t *ds, uint64_t size, 1048 uint64_t *sizep) 1049{ 1050 int err; 1051 /* 1052 * Assume that space (both on-disk and in-stream) is dominated by 1053 * data. We will adjust for indirect blocks and the copies property, 1054 * but ignore per-object space used (eg, dnodes and DRR_OBJECT records). 1055 */ 1056 1057 /* 1058 * Subtract out approximate space used by indirect blocks. 1059 * Assume most space is used by data blocks (non-indirect, non-dnode). 1060 * Assume all blocks are recordsize. Assume ditto blocks and 1061 * internal fragmentation counter out compression. 1062 * 1063 * Therefore, space used by indirect blocks is sizeof(blkptr_t) per 1064 * block, which we observe in practice. 1065 */ 1066 uint64_t recordsize; 1067 err = dsl_prop_get_int_ds(ds, "recordsize", &recordsize); 1068 if (err != 0) 1069 return (err); 1070 size -= size / recordsize * sizeof (blkptr_t); 1071 1072 /* Add in the space for the record associated with each block. */ 1073 size += size / recordsize * sizeof (dmu_replay_record_t); 1074 1075 *sizep = size; 1076 1077 return (0); 1078} 1079 1080int 1081dmu_send_estimate(dsl_dataset_t *ds, dsl_dataset_t *fromds, uint64_t *sizep) 1082{ 1083 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1084 int err; 1085 uint64_t size; 1086 1087 ASSERT(dsl_pool_config_held(dp)); 1088 1089 /* tosnap must be a snapshot */ 1090 if (!ds->ds_is_snapshot) 1091 return (SET_ERROR(EINVAL)); 1092 1093 /* fromsnap, if provided, must be a snapshot */ 1094 if (fromds != NULL && !fromds->ds_is_snapshot) 1095 return (SET_ERROR(EINVAL)); 1096 1097 /* 1098 * fromsnap must be an earlier snapshot from the same fs as tosnap, 1099 * or the origin's fs. 1100 */ 1101 if (fromds != NULL && !dsl_dataset_is_before(ds, fromds, 0)) 1102 return (SET_ERROR(EXDEV)); 1103 1104 /* Get uncompressed size estimate of changed data. */ 1105 if (fromds == NULL) { 1106 size = dsl_dataset_phys(ds)->ds_uncompressed_bytes; 1107 } else { 1108 uint64_t used, comp; 1109 err = dsl_dataset_space_written(fromds, ds, 1110 &used, &comp, &size); 1111 if (err != 0) 1112 return (err); 1113 } 1114 1115 err = dmu_adjust_send_estimate_for_indirects(ds, size, sizep); 1116 return (err); 1117} 1118 1119/* 1120 * Simple callback used to traverse the blocks of a snapshot and sum their 1121 * uncompressed size 1122 */ 1123/* ARGSUSED */ 1124static int 1125dmu_calculate_send_traversal(spa_t *spa, zilog_t *zilog, const blkptr_t *bp, 1126 const zbookmark_phys_t *zb, const dnode_phys_t *dnp, void *arg) 1127{ 1128 uint64_t *spaceptr = arg; 1129 if (bp != NULL && !BP_IS_HOLE(bp)) { 1130 *spaceptr += BP_GET_UCSIZE(bp); 1131 } 1132 return (0); 1133} 1134 1135/* 1136 * Given a desination snapshot and a TXG, calculate the approximate size of a 1137 * send stream sent from that TXG. from_txg may be zero, indicating that the 1138 * whole snapshot will be sent. 1139 */ 1140int 1141dmu_send_estimate_from_txg(dsl_dataset_t *ds, uint64_t from_txg, 1142 uint64_t *sizep) 1143{ 1144 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1145 int err; 1146 uint64_t size = 0; 1147 1148 ASSERT(dsl_pool_config_held(dp)); 1149 1150 /* tosnap must be a snapshot */ 1151 if (!dsl_dataset_is_snapshot(ds)) 1152 return (SET_ERROR(EINVAL)); 1153 1154 /* verify that from_txg is before the provided snapshot was taken */ 1155 if (from_txg >= dsl_dataset_phys(ds)->ds_creation_txg) { 1156 return (SET_ERROR(EXDEV)); 1157 } 1158 1159 /* 1160 * traverse the blocks of the snapshot with birth times after 1161 * from_txg, summing their uncompressed size 1162 */ 1163 err = traverse_dataset(ds, from_txg, TRAVERSE_POST, 1164 dmu_calculate_send_traversal, &size); 1165 if (err) 1166 return (err); 1167 1168 err = dmu_adjust_send_estimate_for_indirects(ds, size, sizep); 1169 return (err); 1170} 1171 1172typedef struct dmu_recv_begin_arg { 1173 const char *drba_origin; 1174 dmu_recv_cookie_t *drba_cookie; 1175 cred_t *drba_cred; 1176 uint64_t drba_snapobj; 1177} dmu_recv_begin_arg_t; 1178 1179static int 1180recv_begin_check_existing_impl(dmu_recv_begin_arg_t *drba, dsl_dataset_t *ds, 1181 uint64_t fromguid) 1182{ 1183 uint64_t val; 1184 int error; 1185 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1186 1187 /* temporary clone name must not exist */ 1188 error = zap_lookup(dp->dp_meta_objset, 1189 dsl_dir_phys(ds->ds_dir)->dd_child_dir_zapobj, recv_clone_name, 1190 8, 1, &val); 1191 if (error != ENOENT) 1192 return (error == 0 ? EBUSY : error); 1193 1194 /* new snapshot name must not exist */ 1195 error = zap_lookup(dp->dp_meta_objset, 1196 dsl_dataset_phys(ds)->ds_snapnames_zapobj, 1197 drba->drba_cookie->drc_tosnap, 8, 1, &val); 1198 if (error != ENOENT) 1199 return (error == 0 ? EEXIST : error); 1200 1201 /* 1202 * Check snapshot limit before receiving. We'll recheck again at the 1203 * end, but might as well abort before receiving if we're already over 1204 * the limit. 1205 * 1206 * Note that we do not check the file system limit with 1207 * dsl_dir_fscount_check because the temporary %clones don't count 1208 * against that limit. 1209 */ 1210 error = dsl_fs_ss_limit_check(ds->ds_dir, 1, ZFS_PROP_SNAPSHOT_LIMIT, 1211 NULL, drba->drba_cred); 1212 if (error != 0) 1213 return (error); 1214 1215 if (fromguid != 0) { 1216 dsl_dataset_t *snap; 1217 uint64_t obj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 1218 1219 /* Find snapshot in this dir that matches fromguid. */ 1220 while (obj != 0) { 1221 error = dsl_dataset_hold_obj(dp, obj, FTAG, 1222 &snap); 1223 if (error != 0) 1224 return (SET_ERROR(ENODEV)); 1225 if (snap->ds_dir != ds->ds_dir) { 1226 dsl_dataset_rele(snap, FTAG); 1227 return (SET_ERROR(ENODEV)); 1228 } 1229 if (dsl_dataset_phys(snap)->ds_guid == fromguid) 1230 break; 1231 obj = dsl_dataset_phys(snap)->ds_prev_snap_obj; 1232 dsl_dataset_rele(snap, FTAG); 1233 } 1234 if (obj == 0) 1235 return (SET_ERROR(ENODEV)); 1236 1237 if (drba->drba_cookie->drc_force) { 1238 drba->drba_snapobj = obj; 1239 } else { 1240 /* 1241 * If we are not forcing, there must be no 1242 * changes since fromsnap. 1243 */ 1244 if (dsl_dataset_modified_since_snap(ds, snap)) { 1245 dsl_dataset_rele(snap, FTAG); 1246 return (SET_ERROR(ETXTBSY)); 1247 } 1248 drba->drba_snapobj = ds->ds_prev->ds_object; 1249 } 1250 1251 dsl_dataset_rele(snap, FTAG); 1252 } else { 1253 /* if full, then must be forced */ 1254 if (!drba->drba_cookie->drc_force) 1255 return (SET_ERROR(EEXIST)); 1256 /* start from $ORIGIN@$ORIGIN, if supported */ 1257 drba->drba_snapobj = dp->dp_origin_snap != NULL ? 1258 dp->dp_origin_snap->ds_object : 0; 1259 } 1260 1261 return (0); 1262 1263} 1264 1265static int 1266dmu_recv_begin_check(void *arg, dmu_tx_t *tx) 1267{ 1268 dmu_recv_begin_arg_t *drba = arg; 1269 dsl_pool_t *dp = dmu_tx_pool(tx); 1270 struct drr_begin *drrb = drba->drba_cookie->drc_drrb; 1271 uint64_t fromguid = drrb->drr_fromguid; 1272 int flags = drrb->drr_flags; 1273 int error; 1274 uint64_t featureflags = DMU_GET_FEATUREFLAGS(drrb->drr_versioninfo); 1275 dsl_dataset_t *ds; 1276 const char *tofs = drba->drba_cookie->drc_tofs; 1277 1278 /* already checked */ 1279 ASSERT3U(drrb->drr_magic, ==, DMU_BACKUP_MAGIC); 1280 ASSERT(!(featureflags & DMU_BACKUP_FEATURE_RESUMING)); 1281 1282 if (DMU_GET_STREAM_HDRTYPE(drrb->drr_versioninfo) == 1283 DMU_COMPOUNDSTREAM || 1284 drrb->drr_type >= DMU_OST_NUMTYPES || 1285 ((flags & DRR_FLAG_CLONE) && drba->drba_origin == NULL)) 1286 return (SET_ERROR(EINVAL)); 1287 1288 /* Verify pool version supports SA if SA_SPILL feature set */ 1289 if ((featureflags & DMU_BACKUP_FEATURE_SA_SPILL) && 1290 spa_version(dp->dp_spa) < SPA_VERSION_SA) 1291 return (SET_ERROR(ENOTSUP)); 1292 1293 if (drba->drba_cookie->drc_resumable && 1294 !spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_EXTENSIBLE_DATASET)) 1295 return (SET_ERROR(ENOTSUP)); 1296 1297 /* 1298 * The receiving code doesn't know how to translate a WRITE_EMBEDDED 1299 * record to a plan WRITE record, so the pool must have the 1300 * EMBEDDED_DATA feature enabled if the stream has WRITE_EMBEDDED 1301 * records. Same with WRITE_EMBEDDED records that use LZ4 compression. 1302 */ 1303 if ((featureflags & DMU_BACKUP_FEATURE_EMBED_DATA) && 1304 !spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_EMBEDDED_DATA)) 1305 return (SET_ERROR(ENOTSUP)); 1306 if ((featureflags & DMU_BACKUP_FEATURE_EMBED_DATA_LZ4) && 1307 !spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_LZ4_COMPRESS)) 1308 return (SET_ERROR(ENOTSUP)); 1309 1310 /* 1311 * The receiving code doesn't know how to translate large blocks 1312 * to smaller ones, so the pool must have the LARGE_BLOCKS 1313 * feature enabled if the stream has LARGE_BLOCKS. 1314 */ 1315 if ((featureflags & DMU_BACKUP_FEATURE_LARGE_BLOCKS) && 1316 !spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_LARGE_BLOCKS)) 1317 return (SET_ERROR(ENOTSUP)); 1318 1319 error = dsl_dataset_hold(dp, tofs, FTAG, &ds); 1320 if (error == 0) { 1321 /* target fs already exists; recv into temp clone */ 1322 1323 /* Can't recv a clone into an existing fs */ 1324 if (flags & DRR_FLAG_CLONE) { 1325 dsl_dataset_rele(ds, FTAG); 1326 return (SET_ERROR(EINVAL)); 1327 } 1328 1329 error = recv_begin_check_existing_impl(drba, ds, fromguid); 1330 dsl_dataset_rele(ds, FTAG); 1331 } else if (error == ENOENT) { 1332 /* target fs does not exist; must be a full backup or clone */ 1333 char buf[MAXNAMELEN]; 1334 1335 /* 1336 * If it's a non-clone incremental, we are missing the 1337 * target fs, so fail the recv. 1338 */ 1339 if (fromguid != 0 && !(flags & DRR_FLAG_CLONE || 1340 drba->drba_origin)) 1341 return (SET_ERROR(ENOENT)); 1342 1343 /* Open the parent of tofs */ 1344 ASSERT3U(strlen(tofs), <, MAXNAMELEN); 1345 (void) strlcpy(buf, tofs, strrchr(tofs, '/') - tofs + 1); 1346 error = dsl_dataset_hold(dp, buf, FTAG, &ds); 1347 if (error != 0) 1348 return (error); 1349 1350 /* 1351 * Check filesystem and snapshot limits before receiving. We'll 1352 * recheck snapshot limits again at the end (we create the 1353 * filesystems and increment those counts during begin_sync). 1354 */ 1355 error = dsl_fs_ss_limit_check(ds->ds_dir, 1, 1356 ZFS_PROP_FILESYSTEM_LIMIT, NULL, drba->drba_cred); 1357 if (error != 0) { 1358 dsl_dataset_rele(ds, FTAG); 1359 return (error); 1360 } 1361 1362 error = dsl_fs_ss_limit_check(ds->ds_dir, 1, 1363 ZFS_PROP_SNAPSHOT_LIMIT, NULL, drba->drba_cred); 1364 if (error != 0) { 1365 dsl_dataset_rele(ds, FTAG); 1366 return (error); 1367 } 1368 1369 if (drba->drba_origin != NULL) { 1370 dsl_dataset_t *origin; 1371 error = dsl_dataset_hold(dp, drba->drba_origin, 1372 FTAG, &origin); 1373 if (error != 0) { 1374 dsl_dataset_rele(ds, FTAG); 1375 return (error); 1376 } 1377 if (!origin->ds_is_snapshot) { 1378 dsl_dataset_rele(origin, FTAG); 1379 dsl_dataset_rele(ds, FTAG); 1380 return (SET_ERROR(EINVAL)); 1381 } 1382 if (dsl_dataset_phys(origin)->ds_guid != fromguid) { 1383 dsl_dataset_rele(origin, FTAG); 1384 dsl_dataset_rele(ds, FTAG); 1385 return (SET_ERROR(ENODEV)); 1386 } 1387 dsl_dataset_rele(origin, FTAG); 1388 } 1389 dsl_dataset_rele(ds, FTAG); 1390 error = 0; 1391 } 1392 return (error); 1393} 1394 1395static void 1396dmu_recv_begin_sync(void *arg, dmu_tx_t *tx) 1397{ 1398 dmu_recv_begin_arg_t *drba = arg; 1399 dsl_pool_t *dp = dmu_tx_pool(tx); 1400 objset_t *mos = dp->dp_meta_objset; 1401 struct drr_begin *drrb = drba->drba_cookie->drc_drrb; 1402 const char *tofs = drba->drba_cookie->drc_tofs; 1403 dsl_dataset_t *ds, *newds; 1404 uint64_t dsobj; 1405 int error; 1406 uint64_t crflags = 0; 1407 1408 if (drrb->drr_flags & DRR_FLAG_CI_DATA) 1409 crflags |= DS_FLAG_CI_DATASET; 1410 1411 error = dsl_dataset_hold(dp, tofs, FTAG, &ds); 1412 if (error == 0) { 1413 /* create temporary clone */ 1414 dsl_dataset_t *snap = NULL; 1415 if (drba->drba_snapobj != 0) { 1416 VERIFY0(dsl_dataset_hold_obj(dp, 1417 drba->drba_snapobj, FTAG, &snap)); 1418 } 1419 dsobj = dsl_dataset_create_sync(ds->ds_dir, recv_clone_name, 1420 snap, crflags, drba->drba_cred, tx); 1421 if (drba->drba_snapobj != 0) 1422 dsl_dataset_rele(snap, FTAG); 1423 dsl_dataset_rele(ds, FTAG); 1424 } else { 1425 dsl_dir_t *dd; 1426 const char *tail; 1427 dsl_dataset_t *origin = NULL; 1428 1429 VERIFY0(dsl_dir_hold(dp, tofs, FTAG, &dd, &tail)); 1430 1431 if (drba->drba_origin != NULL) { 1432 VERIFY0(dsl_dataset_hold(dp, drba->drba_origin, 1433 FTAG, &origin)); 1434 } 1435 1436 /* Create new dataset. */ 1437 dsobj = dsl_dataset_create_sync(dd, 1438 strrchr(tofs, '/') + 1, 1439 origin, crflags, drba->drba_cred, tx); 1440 if (origin != NULL) 1441 dsl_dataset_rele(origin, FTAG); 1442 dsl_dir_rele(dd, FTAG); 1443 drba->drba_cookie->drc_newfs = B_TRUE; 1444 } 1445 VERIFY0(dsl_dataset_own_obj(dp, dsobj, dmu_recv_tag, &newds)); 1446 1447 if (drba->drba_cookie->drc_resumable) { 1448 dsl_dataset_zapify(newds, tx); 1449 if (drrb->drr_fromguid != 0) { 1450 VERIFY0(zap_add(mos, dsobj, DS_FIELD_RESUME_FROMGUID, 1451 8, 1, &drrb->drr_fromguid, tx)); 1452 } 1453 VERIFY0(zap_add(mos, dsobj, DS_FIELD_RESUME_TOGUID, 1454 8, 1, &drrb->drr_toguid, tx)); 1455 VERIFY0(zap_add(mos, dsobj, DS_FIELD_RESUME_TONAME, 1456 1, strlen(drrb->drr_toname) + 1, drrb->drr_toname, tx)); 1457 uint64_t one = 1; 1458 uint64_t zero = 0; 1459 VERIFY0(zap_add(mos, dsobj, DS_FIELD_RESUME_OBJECT, 1460 8, 1, &one, tx)); 1461 VERIFY0(zap_add(mos, dsobj, DS_FIELD_RESUME_OFFSET, 1462 8, 1, &zero, tx)); 1463 VERIFY0(zap_add(mos, dsobj, DS_FIELD_RESUME_BYTES, 1464 8, 1, &zero, tx)); 1465 if (DMU_GET_FEATUREFLAGS(drrb->drr_versioninfo) & 1466 DMU_BACKUP_FEATURE_EMBED_DATA) { 1467 VERIFY0(zap_add(mos, dsobj, DS_FIELD_RESUME_EMBEDOK, 1468 8, 1, &one, tx)); 1469 } 1470 } 1471 1472 dmu_buf_will_dirty(newds->ds_dbuf, tx); 1473 dsl_dataset_phys(newds)->ds_flags |= DS_FLAG_INCONSISTENT; 1474 1475 /* 1476 * If we actually created a non-clone, we need to create the 1477 * objset in our new dataset. 1478 */ 1479 if (BP_IS_HOLE(dsl_dataset_get_blkptr(newds))) { 1480 (void) dmu_objset_create_impl(dp->dp_spa, 1481 newds, dsl_dataset_get_blkptr(newds), drrb->drr_type, tx); 1482 } 1483 1484 drba->drba_cookie->drc_ds = newds; 1485 1486 spa_history_log_internal_ds(newds, "receive", tx, ""); 1487} 1488 1489static int 1490dmu_recv_resume_begin_check(void *arg, dmu_tx_t *tx) 1491{ 1492 dmu_recv_begin_arg_t *drba = arg; 1493 dsl_pool_t *dp = dmu_tx_pool(tx); 1494 struct drr_begin *drrb = drba->drba_cookie->drc_drrb; 1495 int error; 1496 uint64_t featureflags = DMU_GET_FEATUREFLAGS(drrb->drr_versioninfo); 1497 dsl_dataset_t *ds; 1498 const char *tofs = drba->drba_cookie->drc_tofs; 1499 1500 /* already checked */ 1501 ASSERT3U(drrb->drr_magic, ==, DMU_BACKUP_MAGIC); 1502 ASSERT(featureflags & DMU_BACKUP_FEATURE_RESUMING); 1503 1504 if (DMU_GET_STREAM_HDRTYPE(drrb->drr_versioninfo) == 1505 DMU_COMPOUNDSTREAM || 1506 drrb->drr_type >= DMU_OST_NUMTYPES) 1507 return (SET_ERROR(EINVAL)); 1508 1509 /* Verify pool version supports SA if SA_SPILL feature set */ 1510 if ((featureflags & DMU_BACKUP_FEATURE_SA_SPILL) && 1511 spa_version(dp->dp_spa) < SPA_VERSION_SA) 1512 return (SET_ERROR(ENOTSUP)); 1513 1514 /* 1515 * The receiving code doesn't know how to translate a WRITE_EMBEDDED 1516 * record to a plain WRITE record, so the pool must have the 1517 * EMBEDDED_DATA feature enabled if the stream has WRITE_EMBEDDED 1518 * records. Same with WRITE_EMBEDDED records that use LZ4 compression. 1519 */ 1520 if ((featureflags & DMU_BACKUP_FEATURE_EMBED_DATA) && 1521 !spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_EMBEDDED_DATA)) 1522 return (SET_ERROR(ENOTSUP)); 1523 if ((featureflags & DMU_BACKUP_FEATURE_EMBED_DATA_LZ4) && 1524 !spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_LZ4_COMPRESS)) 1525 return (SET_ERROR(ENOTSUP)); 1526 1527 char recvname[ZFS_MAXNAMELEN]; 1528 1529 (void) snprintf(recvname, sizeof (recvname), "%s/%s", 1530 tofs, recv_clone_name); 1531 1532 if (dsl_dataset_hold(dp, recvname, FTAG, &ds) != 0) { 1533 /* %recv does not exist; continue in tofs */ 1534 error = dsl_dataset_hold(dp, tofs, FTAG, &ds); 1535 if (error != 0) 1536 return (error); 1537 } 1538 1539 /* check that ds is marked inconsistent */ 1540 if (!DS_IS_INCONSISTENT(ds)) { 1541 dsl_dataset_rele(ds, FTAG); 1542 return (SET_ERROR(EINVAL)); 1543 } 1544 1545 /* check that there is resuming data, and that the toguid matches */ 1546 if (!dsl_dataset_is_zapified(ds)) { 1547 dsl_dataset_rele(ds, FTAG); 1548 return (SET_ERROR(EINVAL)); 1549 } 1550 uint64_t val; 1551 error = zap_lookup(dp->dp_meta_objset, ds->ds_object, 1552 DS_FIELD_RESUME_TOGUID, sizeof (val), 1, &val); 1553 if (error != 0 || drrb->drr_toguid != val) { 1554 dsl_dataset_rele(ds, FTAG); 1555 return (SET_ERROR(EINVAL)); 1556 } 1557 1558 /* 1559 * Check if the receive is still running. If so, it will be owned. 1560 * Note that nothing else can own the dataset (e.g. after the receive 1561 * fails) because it will be marked inconsistent. 1562 */ 1563 if (dsl_dataset_has_owner(ds)) { 1564 dsl_dataset_rele(ds, FTAG); 1565 return (SET_ERROR(EBUSY)); 1566 } 1567 1568 /* There should not be any snapshots of this fs yet. */ 1569 if (ds->ds_prev != NULL && ds->ds_prev->ds_dir == ds->ds_dir) { 1570 dsl_dataset_rele(ds, FTAG); 1571 return (SET_ERROR(EINVAL)); 1572 } 1573 1574 /* 1575 * Note: resume point will be checked when we process the first WRITE 1576 * record. 1577 */ 1578 1579 /* check that the origin matches */ 1580 val = 0; 1581 (void) zap_lookup(dp->dp_meta_objset, ds->ds_object, 1582 DS_FIELD_RESUME_FROMGUID, sizeof (val), 1, &val); 1583 if (drrb->drr_fromguid != val) { 1584 dsl_dataset_rele(ds, FTAG); 1585 return (SET_ERROR(EINVAL)); 1586 } 1587 1588 dsl_dataset_rele(ds, FTAG); 1589 return (0); 1590} 1591 1592static void 1593dmu_recv_resume_begin_sync(void *arg, dmu_tx_t *tx) 1594{ 1595 dmu_recv_begin_arg_t *drba = arg; 1596 dsl_pool_t *dp = dmu_tx_pool(tx); 1597 const char *tofs = drba->drba_cookie->drc_tofs; 1598 dsl_dataset_t *ds; 1599 uint64_t dsobj; 1600 char recvname[ZFS_MAXNAMELEN]; 1601 1602 (void) snprintf(recvname, sizeof (recvname), "%s/%s", 1603 tofs, recv_clone_name); 1604 1605 if (dsl_dataset_hold(dp, recvname, FTAG, &ds) != 0) { 1606 /* %recv does not exist; continue in tofs */ 1607 VERIFY0(dsl_dataset_hold(dp, tofs, FTAG, &ds)); 1608 drba->drba_cookie->drc_newfs = B_TRUE; 1609 } 1610 1611 /* clear the inconsistent flag so that we can own it */ 1612 ASSERT(DS_IS_INCONSISTENT(ds)); 1613 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1614 dsl_dataset_phys(ds)->ds_flags &= ~DS_FLAG_INCONSISTENT; 1615 dsobj = ds->ds_object; 1616 dsl_dataset_rele(ds, FTAG); 1617 1618 VERIFY0(dsl_dataset_own_obj(dp, dsobj, dmu_recv_tag, &ds)); 1619 1620 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1621 dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_INCONSISTENT; 1622 1623 ASSERT(!BP_IS_HOLE(dsl_dataset_get_blkptr(ds))); 1624 1625 drba->drba_cookie->drc_ds = ds; 1626 1627 spa_history_log_internal_ds(ds, "resume receive", tx, ""); 1628} 1629 1630/* 1631 * NB: callers *MUST* call dmu_recv_stream() if dmu_recv_begin() 1632 * succeeds; otherwise we will leak the holds on the datasets. 1633 */ 1634int 1635dmu_recv_begin(char *tofs, char *tosnap, dmu_replay_record_t *drr_begin, 1636 boolean_t force, boolean_t resumable, char *origin, dmu_recv_cookie_t *drc) 1637{ 1638 dmu_recv_begin_arg_t drba = { 0 }; 1639 1640 bzero(drc, sizeof (dmu_recv_cookie_t)); 1641 drc->drc_drr_begin = drr_begin; 1642 drc->drc_drrb = &drr_begin->drr_u.drr_begin; 1643 drc->drc_tosnap = tosnap; 1644 drc->drc_tofs = tofs; 1645 drc->drc_force = force; 1646 drc->drc_resumable = resumable; 1647 drc->drc_cred = CRED(); 1648 1649 if (drc->drc_drrb->drr_magic == BSWAP_64(DMU_BACKUP_MAGIC)) { 1650 drc->drc_byteswap = B_TRUE; 1651 fletcher_4_incremental_byteswap(drr_begin, 1652 sizeof (dmu_replay_record_t), &drc->drc_cksum); 1653 byteswap_record(drr_begin); 1654 } else if (drc->drc_drrb->drr_magic == DMU_BACKUP_MAGIC) { 1655 fletcher_4_incremental_native(drr_begin, 1656 sizeof (dmu_replay_record_t), &drc->drc_cksum); 1657 } else { 1658 return (SET_ERROR(EINVAL)); 1659 } 1660 1661 drba.drba_origin = origin; 1662 drba.drba_cookie = drc; 1663 drba.drba_cred = CRED(); 1664 1665 if (DMU_GET_FEATUREFLAGS(drc->drc_drrb->drr_versioninfo) & 1666 DMU_BACKUP_FEATURE_RESUMING) { 1667 return (dsl_sync_task(tofs, 1668 dmu_recv_resume_begin_check, dmu_recv_resume_begin_sync, 1669 &drba, 5, ZFS_SPACE_CHECK_NORMAL)); 1670 } else { 1671 return (dsl_sync_task(tofs, 1672 dmu_recv_begin_check, dmu_recv_begin_sync, 1673 &drba, 5, ZFS_SPACE_CHECK_NORMAL)); 1674 } 1675} 1676 1677struct receive_record_arg { 1678 dmu_replay_record_t header; 1679 void *payload; /* Pointer to a buffer containing the payload */ 1680 /* 1681 * If the record is a write, pointer to the arc_buf_t containing the 1682 * payload. 1683 */ 1684 arc_buf_t *write_buf; 1685 int payload_size; 1686 uint64_t bytes_read; /* bytes read from stream when record created */ 1687 boolean_t eos_marker; /* Marks the end of the stream */ 1688 bqueue_node_t node; 1689}; 1690 1691struct receive_writer_arg { 1692 objset_t *os; 1693 boolean_t byteswap; 1694 bqueue_t q; 1695 1696 /* 1697 * These three args are used to signal to the main thread that we're 1698 * done. 1699 */ 1700 kmutex_t mutex; 1701 kcondvar_t cv; 1702 boolean_t done; 1703 1704 int err; 1705 /* A map from guid to dataset to help handle dedup'd streams. */ 1706 avl_tree_t *guid_to_ds_map; 1707 boolean_t resumable; 1708 uint64_t last_object, last_offset; 1709 uint64_t bytes_read; /* bytes read when current record created */ 1710}; 1711 1712struct receive_arg { 1713 objset_t *os; 1714 kthread_t *td; 1715 struct file *fp; 1716 uint64_t voff; /* The current offset in the stream */ 1717 uint64_t bytes_read; 1718 /* 1719 * A record that has had its payload read in, but hasn't yet been handed 1720 * off to the worker thread. 1721 */ 1722 struct receive_record_arg *rrd; 1723 /* A record that has had its header read in, but not its payload. */ 1724 struct receive_record_arg *next_rrd; 1725 zio_cksum_t cksum; 1726 zio_cksum_t prev_cksum; 1727 int err; 1728 boolean_t byteswap; 1729 /* Sorted list of objects not to issue prefetches for. */ 1730 list_t ignore_obj_list; 1731}; 1732 1733struct receive_ign_obj_node { 1734 list_node_t node; 1735 uint64_t object; 1736}; 1737 1738typedef struct guid_map_entry { 1739 uint64_t guid; 1740 dsl_dataset_t *gme_ds; 1741 avl_node_t avlnode; 1742} guid_map_entry_t; 1743 1744static int 1745guid_compare(const void *arg1, const void *arg2) 1746{ 1747 const guid_map_entry_t *gmep1 = arg1; 1748 const guid_map_entry_t *gmep2 = arg2; 1749 1750 if (gmep1->guid < gmep2->guid) 1751 return (-1); 1752 else if (gmep1->guid > gmep2->guid) 1753 return (1); 1754 return (0); 1755} 1756 1757static void 1758free_guid_map_onexit(void *arg) 1759{ 1760 avl_tree_t *ca = arg; 1761 void *cookie = NULL; 1762 guid_map_entry_t *gmep; 1763 1764 while ((gmep = avl_destroy_nodes(ca, &cookie)) != NULL) { 1765 dsl_dataset_long_rele(gmep->gme_ds, gmep); 1766 dsl_dataset_rele(gmep->gme_ds, gmep); 1767 kmem_free(gmep, sizeof (guid_map_entry_t)); 1768 } 1769 avl_destroy(ca); 1770 kmem_free(ca, sizeof (avl_tree_t)); 1771} 1772 1773static int 1774restore_bytes(struct receive_arg *ra, void *buf, int len, off_t off, ssize_t *resid) 1775{ 1776 struct uio auio; 1777 struct iovec aiov; 1778 int error; 1779 1780 aiov.iov_base = buf; 1781 aiov.iov_len = len; 1782 auio.uio_iov = &aiov; 1783 auio.uio_iovcnt = 1; 1784 auio.uio_resid = len; 1785 auio.uio_segflg = UIO_SYSSPACE; 1786 auio.uio_rw = UIO_READ; 1787 auio.uio_offset = off; 1788 auio.uio_td = ra->td; 1789#ifdef _KERNEL 1790 error = fo_read(ra->fp, &auio, ra->td->td_ucred, FOF_OFFSET, ra->td); 1791#else 1792 fprintf(stderr, "%s: returning EOPNOTSUPP\n", __func__); 1793 error = EOPNOTSUPP; 1794#endif 1795 *resid = auio.uio_resid; 1796 return (error); 1797} 1798 1799static int 1800receive_read(struct receive_arg *ra, int len, void *buf) 1801{ 1802 int done = 0; 1803 1804 /* some things will require 8-byte alignment, so everything must */ 1805 ASSERT0(len % 8); 1806 1807 while (done < len) { 1808 ssize_t resid; 1809 1810 ra->err = restore_bytes(ra, buf + done, 1811 len - done, ra->voff, &resid); 1812 1813 if (resid == len - done) { 1814 /* 1815 * Note: ECKSUM indicates that the receive 1816 * was interrupted and can potentially be resumed. 1817 */ 1818 ra->err = SET_ERROR(ECKSUM); 1819 } 1820 ra->voff += len - done - resid; 1821 done = len - resid; 1822 if (ra->err != 0) 1823 return (ra->err); 1824 } 1825 1826 ra->bytes_read += len; 1827 1828 ASSERT3U(done, ==, len); 1829 return (0); 1830} 1831 1832static void 1833byteswap_record(dmu_replay_record_t *drr) 1834{ 1835#define DO64(X) (drr->drr_u.X = BSWAP_64(drr->drr_u.X)) 1836#define DO32(X) (drr->drr_u.X = BSWAP_32(drr->drr_u.X)) 1837 drr->drr_type = BSWAP_32(drr->drr_type); 1838 drr->drr_payloadlen = BSWAP_32(drr->drr_payloadlen); 1839 1840 switch (drr->drr_type) { 1841 case DRR_BEGIN: 1842 DO64(drr_begin.drr_magic); 1843 DO64(drr_begin.drr_versioninfo); 1844 DO64(drr_begin.drr_creation_time); 1845 DO32(drr_begin.drr_type); 1846 DO32(drr_begin.drr_flags); 1847 DO64(drr_begin.drr_toguid); 1848 DO64(drr_begin.drr_fromguid); 1849 break; 1850 case DRR_OBJECT: 1851 DO64(drr_object.drr_object); 1852 DO32(drr_object.drr_type); 1853 DO32(drr_object.drr_bonustype); 1854 DO32(drr_object.drr_blksz); 1855 DO32(drr_object.drr_bonuslen); 1856 DO64(drr_object.drr_toguid); 1857 break; 1858 case DRR_FREEOBJECTS: 1859 DO64(drr_freeobjects.drr_firstobj); 1860 DO64(drr_freeobjects.drr_numobjs); 1861 DO64(drr_freeobjects.drr_toguid); 1862 break; 1863 case DRR_WRITE: 1864 DO64(drr_write.drr_object); 1865 DO32(drr_write.drr_type); 1866 DO64(drr_write.drr_offset); 1867 DO64(drr_write.drr_length); 1868 DO64(drr_write.drr_toguid); 1869 ZIO_CHECKSUM_BSWAP(&drr->drr_u.drr_write.drr_key.ddk_cksum); 1870 DO64(drr_write.drr_key.ddk_prop); 1871 break; 1872 case DRR_WRITE_BYREF: 1873 DO64(drr_write_byref.drr_object); 1874 DO64(drr_write_byref.drr_offset); 1875 DO64(drr_write_byref.drr_length); 1876 DO64(drr_write_byref.drr_toguid); 1877 DO64(drr_write_byref.drr_refguid); 1878 DO64(drr_write_byref.drr_refobject); 1879 DO64(drr_write_byref.drr_refoffset); 1880 ZIO_CHECKSUM_BSWAP(&drr->drr_u.drr_write_byref. 1881 drr_key.ddk_cksum); 1882 DO64(drr_write_byref.drr_key.ddk_prop); 1883 break; 1884 case DRR_WRITE_EMBEDDED: 1885 DO64(drr_write_embedded.drr_object); 1886 DO64(drr_write_embedded.drr_offset); 1887 DO64(drr_write_embedded.drr_length); 1888 DO64(drr_write_embedded.drr_toguid); 1889 DO32(drr_write_embedded.drr_lsize); 1890 DO32(drr_write_embedded.drr_psize); 1891 break; 1892 case DRR_FREE: 1893 DO64(drr_free.drr_object); 1894 DO64(drr_free.drr_offset); 1895 DO64(drr_free.drr_length); 1896 DO64(drr_free.drr_toguid); 1897 break; 1898 case DRR_SPILL: 1899 DO64(drr_spill.drr_object); 1900 DO64(drr_spill.drr_length); 1901 DO64(drr_spill.drr_toguid); 1902 break; 1903 case DRR_END: 1904 DO64(drr_end.drr_toguid); 1905 ZIO_CHECKSUM_BSWAP(&drr->drr_u.drr_end.drr_checksum); 1906 break; 1907 } 1908 1909 if (drr->drr_type != DRR_BEGIN) { 1910 ZIO_CHECKSUM_BSWAP(&drr->drr_u.drr_checksum.drr_checksum); 1911 } 1912 1913#undef DO64 1914#undef DO32 1915} 1916 1917static inline uint8_t 1918deduce_nblkptr(dmu_object_type_t bonus_type, uint64_t bonus_size) 1919{ 1920 if (bonus_type == DMU_OT_SA) { 1921 return (1); 1922 } else { 1923 return (1 + 1924 ((DN_MAX_BONUSLEN - bonus_size) >> SPA_BLKPTRSHIFT)); 1925 } 1926} 1927 1928static void 1929save_resume_state(struct receive_writer_arg *rwa, 1930 uint64_t object, uint64_t offset, dmu_tx_t *tx) 1931{ 1932 int txgoff = dmu_tx_get_txg(tx) & TXG_MASK; 1933 1934 if (!rwa->resumable) 1935 return; 1936 1937 /* 1938 * We use ds_resume_bytes[] != 0 to indicate that we need to 1939 * update this on disk, so it must not be 0. 1940 */ 1941 ASSERT(rwa->bytes_read != 0); 1942 1943 /* 1944 * We only resume from write records, which have a valid 1945 * (non-meta-dnode) object number. 1946 */ 1947 ASSERT(object != 0); 1948 1949 /* 1950 * For resuming to work correctly, we must receive records in order, 1951 * sorted by object,offset. This is checked by the callers, but 1952 * assert it here for good measure. 1953 */ 1954 ASSERT3U(object, >=, rwa->os->os_dsl_dataset->ds_resume_object[txgoff]); 1955 ASSERT(object != rwa->os->os_dsl_dataset->ds_resume_object[txgoff] || 1956 offset >= rwa->os->os_dsl_dataset->ds_resume_offset[txgoff]); 1957 ASSERT3U(rwa->bytes_read, >=, 1958 rwa->os->os_dsl_dataset->ds_resume_bytes[txgoff]); 1959 1960 rwa->os->os_dsl_dataset->ds_resume_object[txgoff] = object; 1961 rwa->os->os_dsl_dataset->ds_resume_offset[txgoff] = offset; 1962 rwa->os->os_dsl_dataset->ds_resume_bytes[txgoff] = rwa->bytes_read; 1963} 1964 1965static int 1966receive_object(struct receive_writer_arg *rwa, struct drr_object *drro, 1967 void *data) 1968{ 1969 dmu_object_info_t doi; 1970 dmu_tx_t *tx; 1971 uint64_t object; 1972 int err; 1973 1974 if (drro->drr_type == DMU_OT_NONE || 1975 !DMU_OT_IS_VALID(drro->drr_type) || 1976 !DMU_OT_IS_VALID(drro->drr_bonustype) || 1977 drro->drr_checksumtype >= ZIO_CHECKSUM_FUNCTIONS || 1978 drro->drr_compress >= ZIO_COMPRESS_FUNCTIONS || 1979 P2PHASE(drro->drr_blksz, SPA_MINBLOCKSIZE) || 1980 drro->drr_blksz < SPA_MINBLOCKSIZE || 1981 drro->drr_blksz > spa_maxblocksize(dmu_objset_spa(rwa->os)) || 1982 drro->drr_bonuslen > DN_MAX_BONUSLEN) { 1983 return (SET_ERROR(EINVAL)); 1984 } 1985 1986 err = dmu_object_info(rwa->os, drro->drr_object, &doi); 1987 1988 if (err != 0 && err != ENOENT) 1989 return (SET_ERROR(EINVAL)); 1990 object = err == 0 ? drro->drr_object : DMU_NEW_OBJECT; 1991 1992 /* 1993 * If we are losing blkptrs or changing the block size this must 1994 * be a new file instance. We must clear out the previous file 1995 * contents before we can change this type of metadata in the dnode. 1996 */ 1997 if (err == 0) { 1998 int nblkptr; 1999 2000 nblkptr = deduce_nblkptr(drro->drr_bonustype, 2001 drro->drr_bonuslen); 2002 2003 if (drro->drr_blksz != doi.doi_data_block_size || 2004 nblkptr < doi.doi_nblkptr) { 2005 err = dmu_free_long_range(rwa->os, drro->drr_object, 2006 0, DMU_OBJECT_END); 2007 if (err != 0) 2008 return (SET_ERROR(EINVAL)); 2009 } 2010 } 2011 2012 tx = dmu_tx_create(rwa->os); 2013 dmu_tx_hold_bonus(tx, object); 2014 err = dmu_tx_assign(tx, TXG_WAIT); 2015 if (err != 0) { 2016 dmu_tx_abort(tx); 2017 return (err); 2018 } 2019 2020 if (object == DMU_NEW_OBJECT) { 2021 /* currently free, want to be allocated */ 2022 err = dmu_object_claim(rwa->os, drro->drr_object, 2023 drro->drr_type, drro->drr_blksz, 2024 drro->drr_bonustype, drro->drr_bonuslen, tx); 2025 } else if (drro->drr_type != doi.doi_type || 2026 drro->drr_blksz != doi.doi_data_block_size || 2027 drro->drr_bonustype != doi.doi_bonus_type || 2028 drro->drr_bonuslen != doi.doi_bonus_size) { 2029 /* currently allocated, but with different properties */ 2030 err = dmu_object_reclaim(rwa->os, drro->drr_object, 2031 drro->drr_type, drro->drr_blksz, 2032 drro->drr_bonustype, drro->drr_bonuslen, tx); 2033 } 2034 if (err != 0) { 2035 dmu_tx_commit(tx); 2036 return (SET_ERROR(EINVAL)); 2037 } 2038 2039 dmu_object_set_checksum(rwa->os, drro->drr_object, 2040 drro->drr_checksumtype, tx); 2041 dmu_object_set_compress(rwa->os, drro->drr_object, 2042 drro->drr_compress, tx); 2043 2044 if (data != NULL) { 2045 dmu_buf_t *db; 2046 2047 VERIFY0(dmu_bonus_hold(rwa->os, drro->drr_object, FTAG, &db)); 2048 dmu_buf_will_dirty(db, tx); 2049 2050 ASSERT3U(db->db_size, >=, drro->drr_bonuslen); 2051 bcopy(data, db->db_data, drro->drr_bonuslen); 2052 if (rwa->byteswap) { 2053 dmu_object_byteswap_t byteswap = 2054 DMU_OT_BYTESWAP(drro->drr_bonustype); 2055 dmu_ot_byteswap[byteswap].ob_func(db->db_data, 2056 drro->drr_bonuslen); 2057 } 2058 dmu_buf_rele(db, FTAG); 2059 } 2060 dmu_tx_commit(tx); 2061 2062 return (0); 2063} 2064 2065/* ARGSUSED */ 2066static int 2067receive_freeobjects(struct receive_writer_arg *rwa, 2068 struct drr_freeobjects *drrfo) 2069{ 2070 uint64_t obj; 2071 2072 if (drrfo->drr_firstobj + drrfo->drr_numobjs < drrfo->drr_firstobj) 2073 return (SET_ERROR(EINVAL)); 2074 2075 for (obj = drrfo->drr_firstobj; 2076 obj < drrfo->drr_firstobj + drrfo->drr_numobjs; 2077 (void) dmu_object_next(rwa->os, &obj, FALSE, 0)) { 2078 int err; 2079 2080 if (dmu_object_info(rwa->os, obj, NULL) != 0) 2081 continue; 2082 2083 err = dmu_free_long_object(rwa->os, obj); 2084 if (err != 0) 2085 return (err); 2086 } 2087 2088 return (0); 2089} 2090 2091static int 2092receive_write(struct receive_writer_arg *rwa, struct drr_write *drrw, 2093 arc_buf_t *abuf) 2094{ 2095 dmu_tx_t *tx; 2096 int err; 2097 2098 if (drrw->drr_offset + drrw->drr_length < drrw->drr_offset || 2099 !DMU_OT_IS_VALID(drrw->drr_type)) 2100 return (SET_ERROR(EINVAL)); 2101 2102 /* 2103 * For resuming to work, records must be in increasing order 2104 * by (object, offset). 2105 */ 2106 if (drrw->drr_object < rwa->last_object || 2107 (drrw->drr_object == rwa->last_object && 2108 drrw->drr_offset < rwa->last_offset)) { 2109 return (SET_ERROR(EINVAL)); 2110 } 2111 rwa->last_object = drrw->drr_object; 2112 rwa->last_offset = drrw->drr_offset; 2113 2114 if (dmu_object_info(rwa->os, drrw->drr_object, NULL) != 0) 2115 return (SET_ERROR(EINVAL)); 2116 2117 tx = dmu_tx_create(rwa->os); 2118 2119 dmu_tx_hold_write(tx, drrw->drr_object, 2120 drrw->drr_offset, drrw->drr_length); 2121 err = dmu_tx_assign(tx, TXG_WAIT); 2122 if (err != 0) { 2123 dmu_tx_abort(tx); 2124 return (err); 2125 } 2126 if (rwa->byteswap) { 2127 dmu_object_byteswap_t byteswap = 2128 DMU_OT_BYTESWAP(drrw->drr_type); 2129 dmu_ot_byteswap[byteswap].ob_func(abuf->b_data, 2130 drrw->drr_length); 2131 } 2132 2133 dmu_buf_t *bonus; 2134 if (dmu_bonus_hold(rwa->os, drrw->drr_object, FTAG, &bonus) != 0) 2135 return (SET_ERROR(EINVAL)); 2136 dmu_assign_arcbuf(bonus, drrw->drr_offset, abuf, tx); 2137 2138 /* 2139 * Note: If the receive fails, we want the resume stream to start 2140 * with the same record that we last successfully received (as opposed 2141 * to the next record), so that we can verify that we are 2142 * resuming from the correct location. 2143 */ 2144 save_resume_state(rwa, drrw->drr_object, drrw->drr_offset, tx); 2145 dmu_tx_commit(tx); 2146 dmu_buf_rele(bonus, FTAG); 2147 2148 return (0); 2149} 2150 2151/* 2152 * Handle a DRR_WRITE_BYREF record. This record is used in dedup'ed 2153 * streams to refer to a copy of the data that is already on the 2154 * system because it came in earlier in the stream. This function 2155 * finds the earlier copy of the data, and uses that copy instead of 2156 * data from the stream to fulfill this write. 2157 */ 2158static int 2159receive_write_byref(struct receive_writer_arg *rwa, 2160 struct drr_write_byref *drrwbr) 2161{ 2162 dmu_tx_t *tx; 2163 int err; 2164 guid_map_entry_t gmesrch; 2165 guid_map_entry_t *gmep; 2166 avl_index_t where; 2167 objset_t *ref_os = NULL; 2168 dmu_buf_t *dbp; 2169 2170 if (drrwbr->drr_offset + drrwbr->drr_length < drrwbr->drr_offset) 2171 return (SET_ERROR(EINVAL)); 2172 2173 /* 2174 * If the GUID of the referenced dataset is different from the 2175 * GUID of the target dataset, find the referenced dataset. 2176 */ 2177 if (drrwbr->drr_toguid != drrwbr->drr_refguid) { 2178 gmesrch.guid = drrwbr->drr_refguid; 2179 if ((gmep = avl_find(rwa->guid_to_ds_map, &gmesrch, 2180 &where)) == NULL) { 2181 return (SET_ERROR(EINVAL)); 2182 } 2183 if (dmu_objset_from_ds(gmep->gme_ds, &ref_os)) 2184 return (SET_ERROR(EINVAL)); 2185 } else { 2186 ref_os = rwa->os; 2187 } 2188 2189 err = dmu_buf_hold(ref_os, drrwbr->drr_refobject, 2190 drrwbr->drr_refoffset, FTAG, &dbp, DMU_READ_PREFETCH); 2191 if (err != 0) 2192 return (err); 2193 2194 tx = dmu_tx_create(rwa->os); 2195 2196 dmu_tx_hold_write(tx, drrwbr->drr_object, 2197 drrwbr->drr_offset, drrwbr->drr_length); 2198 err = dmu_tx_assign(tx, TXG_WAIT); 2199 if (err != 0) { 2200 dmu_tx_abort(tx); 2201 return (err); 2202 } 2203 dmu_write(rwa->os, drrwbr->drr_object, 2204 drrwbr->drr_offset, drrwbr->drr_length, dbp->db_data, tx); 2205 dmu_buf_rele(dbp, FTAG); 2206 2207 /* See comment in restore_write. */ 2208 save_resume_state(rwa, drrwbr->drr_object, drrwbr->drr_offset, tx); 2209 dmu_tx_commit(tx); 2210 return (0); 2211} 2212 2213static int 2214receive_write_embedded(struct receive_writer_arg *rwa, 2215 struct drr_write_embedded *drrwe, void *data) 2216{ 2217 dmu_tx_t *tx; 2218 int err; 2219 2220 if (drrwe->drr_offset + drrwe->drr_length < drrwe->drr_offset) 2221 return (EINVAL); 2222 2223 if (drrwe->drr_psize > BPE_PAYLOAD_SIZE) 2224 return (EINVAL); 2225 2226 if (drrwe->drr_etype >= NUM_BP_EMBEDDED_TYPES) 2227 return (EINVAL); 2228 if (drrwe->drr_compression >= ZIO_COMPRESS_FUNCTIONS) 2229 return (EINVAL); 2230 2231 tx = dmu_tx_create(rwa->os); 2232 2233 dmu_tx_hold_write(tx, drrwe->drr_object, 2234 drrwe->drr_offset, drrwe->drr_length); 2235 err = dmu_tx_assign(tx, TXG_WAIT); 2236 if (err != 0) { 2237 dmu_tx_abort(tx); 2238 return (err); 2239 } 2240 2241 dmu_write_embedded(rwa->os, drrwe->drr_object, 2242 drrwe->drr_offset, data, drrwe->drr_etype, 2243 drrwe->drr_compression, drrwe->drr_lsize, drrwe->drr_psize, 2244 rwa->byteswap ^ ZFS_HOST_BYTEORDER, tx); 2245 2246 /* See comment in restore_write. */ 2247 save_resume_state(rwa, drrwe->drr_object, drrwe->drr_offset, tx); 2248 dmu_tx_commit(tx); 2249 return (0); 2250} 2251 2252static int 2253receive_spill(struct receive_writer_arg *rwa, struct drr_spill *drrs, 2254 void *data) 2255{ 2256 dmu_tx_t *tx; 2257 dmu_buf_t *db, *db_spill; 2258 int err; 2259 2260 if (drrs->drr_length < SPA_MINBLOCKSIZE || 2261 drrs->drr_length > spa_maxblocksize(dmu_objset_spa(rwa->os))) 2262 return (SET_ERROR(EINVAL)); 2263 2264 if (dmu_object_info(rwa->os, drrs->drr_object, NULL) != 0) 2265 return (SET_ERROR(EINVAL)); 2266 2267 VERIFY0(dmu_bonus_hold(rwa->os, drrs->drr_object, FTAG, &db)); 2268 if ((err = dmu_spill_hold_by_bonus(db, FTAG, &db_spill)) != 0) { 2269 dmu_buf_rele(db, FTAG); 2270 return (err); 2271 } 2272 2273 tx = dmu_tx_create(rwa->os); 2274 2275 dmu_tx_hold_spill(tx, db->db_object); 2276 2277 err = dmu_tx_assign(tx, TXG_WAIT); 2278 if (err != 0) { 2279 dmu_buf_rele(db, FTAG); 2280 dmu_buf_rele(db_spill, FTAG); 2281 dmu_tx_abort(tx); 2282 return (err); 2283 } 2284 dmu_buf_will_dirty(db_spill, tx); 2285 2286 if (db_spill->db_size < drrs->drr_length) 2287 VERIFY(0 == dbuf_spill_set_blksz(db_spill, 2288 drrs->drr_length, tx)); 2289 bcopy(data, db_spill->db_data, drrs->drr_length); 2290 2291 dmu_buf_rele(db, FTAG); 2292 dmu_buf_rele(db_spill, FTAG); 2293 2294 dmu_tx_commit(tx); 2295 return (0); 2296} 2297 2298/* ARGSUSED */ 2299static int 2300receive_free(struct receive_writer_arg *rwa, struct drr_free *drrf) 2301{ 2302 int err; 2303 2304 if (drrf->drr_length != -1ULL && 2305 drrf->drr_offset + drrf->drr_length < drrf->drr_offset) 2306 return (SET_ERROR(EINVAL)); 2307 2308 if (dmu_object_info(rwa->os, drrf->drr_object, NULL) != 0) 2309 return (SET_ERROR(EINVAL)); 2310 2311 err = dmu_free_long_range(rwa->os, drrf->drr_object, 2312 drrf->drr_offset, drrf->drr_length); 2313 2314 return (err); 2315} 2316 2317/* used to destroy the drc_ds on error */ 2318static void 2319dmu_recv_cleanup_ds(dmu_recv_cookie_t *drc) 2320{ 2321 if (drc->drc_resumable) { 2322 /* wait for our resume state to be written to disk */ 2323 txg_wait_synced(drc->drc_ds->ds_dir->dd_pool, 0); 2324 dsl_dataset_disown(drc->drc_ds, dmu_recv_tag); 2325 } else { 2326 char name[MAXNAMELEN]; 2327 dsl_dataset_name(drc->drc_ds, name); 2328 dsl_dataset_disown(drc->drc_ds, dmu_recv_tag); 2329 (void) dsl_destroy_head(name); 2330 } 2331} 2332 2333static void 2334receive_cksum(struct receive_arg *ra, int len, void *buf) 2335{ 2336 if (ra->byteswap) { 2337 fletcher_4_incremental_byteswap(buf, len, &ra->cksum); 2338 } else { 2339 fletcher_4_incremental_native(buf, len, &ra->cksum); 2340 } 2341} 2342 2343/* 2344 * Read the payload into a buffer of size len, and update the current record's 2345 * payload field. 2346 * Allocate ra->next_rrd and read the next record's header into 2347 * ra->next_rrd->header. 2348 * Verify checksum of payload and next record. 2349 */ 2350static int 2351receive_read_payload_and_next_header(struct receive_arg *ra, int len, void *buf) 2352{ 2353 int err; 2354 2355 if (len != 0) { 2356 ASSERT3U(len, <=, SPA_MAXBLOCKSIZE); 2357 err = receive_read(ra, len, buf); 2358 if (err != 0) 2359 return (err); 2360 receive_cksum(ra, len, buf); 2361 2362 /* note: rrd is NULL when reading the begin record's payload */ 2363 if (ra->rrd != NULL) { 2364 ra->rrd->payload = buf; 2365 ra->rrd->payload_size = len; 2366 ra->rrd->bytes_read = ra->bytes_read; 2367 } 2368 } 2369 2370 ra->prev_cksum = ra->cksum; 2371 2372 ra->next_rrd = kmem_zalloc(sizeof (*ra->next_rrd), KM_SLEEP); 2373 err = receive_read(ra, sizeof (ra->next_rrd->header), 2374 &ra->next_rrd->header); 2375 ra->next_rrd->bytes_read = ra->bytes_read; 2376 if (err != 0) { 2377 kmem_free(ra->next_rrd, sizeof (*ra->next_rrd)); 2378 ra->next_rrd = NULL; 2379 return (err); 2380 } 2381 if (ra->next_rrd->header.drr_type == DRR_BEGIN) { 2382 kmem_free(ra->next_rrd, sizeof (*ra->next_rrd)); 2383 ra->next_rrd = NULL; 2384 return (SET_ERROR(EINVAL)); 2385 } 2386 2387 /* 2388 * Note: checksum is of everything up to but not including the 2389 * checksum itself. 2390 */ 2391 ASSERT3U(offsetof(dmu_replay_record_t, drr_u.drr_checksum.drr_checksum), 2392 ==, sizeof (dmu_replay_record_t) - sizeof (zio_cksum_t)); 2393 receive_cksum(ra, 2394 offsetof(dmu_replay_record_t, drr_u.drr_checksum.drr_checksum), 2395 &ra->next_rrd->header); 2396 2397 zio_cksum_t cksum_orig = 2398 ra->next_rrd->header.drr_u.drr_checksum.drr_checksum; 2399 zio_cksum_t *cksump = 2400 &ra->next_rrd->header.drr_u.drr_checksum.drr_checksum; 2401 2402 if (ra->byteswap) 2403 byteswap_record(&ra->next_rrd->header); 2404 2405 if ((!ZIO_CHECKSUM_IS_ZERO(cksump)) && 2406 !ZIO_CHECKSUM_EQUAL(ra->cksum, *cksump)) { 2407 kmem_free(ra->next_rrd, sizeof (*ra->next_rrd)); 2408 ra->next_rrd = NULL; 2409 return (SET_ERROR(ECKSUM)); 2410 } 2411 2412 receive_cksum(ra, sizeof (cksum_orig), &cksum_orig); 2413 2414 return (0); 2415} 2416 2417/* 2418 * Issue the prefetch reads for any necessary indirect blocks. 2419 * 2420 * We use the object ignore list to tell us whether or not to issue prefetches 2421 * for a given object. We do this for both correctness (in case the blocksize 2422 * of an object has changed) and performance (if the object doesn't exist, don't 2423 * needlessly try to issue prefetches). We also trim the list as we go through 2424 * the stream to prevent it from growing to an unbounded size. 2425 * 2426 * The object numbers within will always be in sorted order, and any write 2427 * records we see will also be in sorted order, but they're not sorted with 2428 * respect to each other (i.e. we can get several object records before 2429 * receiving each object's write records). As a result, once we've reached a 2430 * given object number, we can safely remove any reference to lower object 2431 * numbers in the ignore list. In practice, we receive up to 32 object records 2432 * before receiving write records, so the list can have up to 32 nodes in it. 2433 */ 2434/* ARGSUSED */ 2435static void 2436receive_read_prefetch(struct receive_arg *ra, 2437 uint64_t object, uint64_t offset, uint64_t length) 2438{ 2439 struct receive_ign_obj_node *node = list_head(&ra->ignore_obj_list); 2440 while (node != NULL && node->object < object) { 2441 VERIFY3P(node, ==, list_remove_head(&ra->ignore_obj_list)); 2442 kmem_free(node, sizeof (*node)); 2443 node = list_head(&ra->ignore_obj_list); 2444 } 2445 if (node == NULL || node->object > object) { 2446 dmu_prefetch(ra->os, object, 1, offset, length, 2447 ZIO_PRIORITY_SYNC_READ); 2448 } 2449} 2450 2451/* 2452 * Read records off the stream, issuing any necessary prefetches. 2453 */ 2454static int 2455receive_read_record(struct receive_arg *ra) 2456{ 2457 int err; 2458 2459 switch (ra->rrd->header.drr_type) { 2460 case DRR_OBJECT: 2461 { 2462 struct drr_object *drro = &ra->rrd->header.drr_u.drr_object; 2463 uint32_t size = P2ROUNDUP(drro->drr_bonuslen, 8); 2464 void *buf = kmem_zalloc(size, KM_SLEEP); 2465 dmu_object_info_t doi; 2466 err = receive_read_payload_and_next_header(ra, size, buf); 2467 if (err != 0) { 2468 kmem_free(buf, size); 2469 return (err); 2470 } 2471 err = dmu_object_info(ra->os, drro->drr_object, &doi); 2472 /* 2473 * See receive_read_prefetch for an explanation why we're 2474 * storing this object in the ignore_obj_list. 2475 */ 2476 if (err == ENOENT || 2477 (err == 0 && doi.doi_data_block_size != drro->drr_blksz)) { 2478 struct receive_ign_obj_node *node = 2479 kmem_zalloc(sizeof (*node), 2480 KM_SLEEP); 2481 node->object = drro->drr_object; 2482#ifdef ZFS_DEBUG 2483 struct receive_ign_obj_node *last_object = 2484 list_tail(&ra->ignore_obj_list); 2485 uint64_t last_objnum = (last_object != NULL ? 2486 last_object->object : 0); 2487 ASSERT3U(node->object, >, last_objnum); 2488#endif 2489 list_insert_tail(&ra->ignore_obj_list, node); 2490 err = 0; 2491 } 2492 return (err); 2493 } 2494 case DRR_FREEOBJECTS: 2495 { 2496 err = receive_read_payload_and_next_header(ra, 0, NULL); 2497 return (err); 2498 } 2499 case DRR_WRITE: 2500 { 2501 struct drr_write *drrw = &ra->rrd->header.drr_u.drr_write; 2502 arc_buf_t *abuf = arc_loan_buf(dmu_objset_spa(ra->os), 2503 drrw->drr_length); 2504 2505 err = receive_read_payload_and_next_header(ra, 2506 drrw->drr_length, abuf->b_data); 2507 if (err != 0) { 2508 dmu_return_arcbuf(abuf); 2509 return (err); 2510 } 2511 ra->rrd->write_buf = abuf; 2512 receive_read_prefetch(ra, drrw->drr_object, drrw->drr_offset, 2513 drrw->drr_length); 2514 return (err); 2515 } 2516 case DRR_WRITE_BYREF: 2517 { 2518 struct drr_write_byref *drrwb = 2519 &ra->rrd->header.drr_u.drr_write_byref; 2520 err = receive_read_payload_and_next_header(ra, 0, NULL); 2521 receive_read_prefetch(ra, drrwb->drr_object, drrwb->drr_offset, 2522 drrwb->drr_length); 2523 return (err); 2524 } 2525 case DRR_WRITE_EMBEDDED: 2526 { 2527 struct drr_write_embedded *drrwe = 2528 &ra->rrd->header.drr_u.drr_write_embedded; 2529 uint32_t size = P2ROUNDUP(drrwe->drr_psize, 8); 2530 void *buf = kmem_zalloc(size, KM_SLEEP); 2531 2532 err = receive_read_payload_and_next_header(ra, size, buf); 2533 if (err != 0) { 2534 kmem_free(buf, size); 2535 return (err); 2536 } 2537 2538 receive_read_prefetch(ra, drrwe->drr_object, drrwe->drr_offset, 2539 drrwe->drr_length); 2540 return (err); 2541 } 2542 case DRR_FREE: 2543 { 2544 /* 2545 * It might be beneficial to prefetch indirect blocks here, but 2546 * we don't really have the data to decide for sure. 2547 */ 2548 err = receive_read_payload_and_next_header(ra, 0, NULL); 2549 return (err); 2550 } 2551 case DRR_END: 2552 { 2553 struct drr_end *drre = &ra->rrd->header.drr_u.drr_end; 2554 if (!ZIO_CHECKSUM_EQUAL(ra->prev_cksum, drre->drr_checksum)) 2555 return (SET_ERROR(ECKSUM)); 2556 return (0); 2557 } 2558 case DRR_SPILL: 2559 { 2560 struct drr_spill *drrs = &ra->rrd->header.drr_u.drr_spill; 2561 void *buf = kmem_zalloc(drrs->drr_length, KM_SLEEP); 2562 err = receive_read_payload_and_next_header(ra, drrs->drr_length, 2563 buf); 2564 if (err != 0) 2565 kmem_free(buf, drrs->drr_length); 2566 return (err); 2567 } 2568 default: 2569 return (SET_ERROR(EINVAL)); 2570 } 2571} 2572 2573/* 2574 * Commit the records to the pool. 2575 */ 2576static int 2577receive_process_record(struct receive_writer_arg *rwa, 2578 struct receive_record_arg *rrd) 2579{ 2580 int err; 2581 2582 /* Processing in order, therefore bytes_read should be increasing. */ 2583 ASSERT3U(rrd->bytes_read, >=, rwa->bytes_read); 2584 rwa->bytes_read = rrd->bytes_read; 2585 2586 switch (rrd->header.drr_type) { 2587 case DRR_OBJECT: 2588 { 2589 struct drr_object *drro = &rrd->header.drr_u.drr_object; 2590 err = receive_object(rwa, drro, rrd->payload); 2591 kmem_free(rrd->payload, rrd->payload_size); 2592 rrd->payload = NULL; 2593 return (err); 2594 } 2595 case DRR_FREEOBJECTS: 2596 { 2597 struct drr_freeobjects *drrfo = 2598 &rrd->header.drr_u.drr_freeobjects; 2599 return (receive_freeobjects(rwa, drrfo)); 2600 } 2601 case DRR_WRITE: 2602 { 2603 struct drr_write *drrw = &rrd->header.drr_u.drr_write; 2604 err = receive_write(rwa, drrw, rrd->write_buf); 2605 /* if receive_write() is successful, it consumes the arc_buf */ 2606 if (err != 0) 2607 dmu_return_arcbuf(rrd->write_buf); 2608 rrd->write_buf = NULL; 2609 rrd->payload = NULL; 2610 return (err); 2611 } 2612 case DRR_WRITE_BYREF: 2613 { 2614 struct drr_write_byref *drrwbr = 2615 &rrd->header.drr_u.drr_write_byref; 2616 return (receive_write_byref(rwa, drrwbr)); 2617 } 2618 case DRR_WRITE_EMBEDDED: 2619 { 2620 struct drr_write_embedded *drrwe = 2621 &rrd->header.drr_u.drr_write_embedded; 2622 err = receive_write_embedded(rwa, drrwe, rrd->payload); 2623 kmem_free(rrd->payload, rrd->payload_size); 2624 rrd->payload = NULL; 2625 return (err); 2626 } 2627 case DRR_FREE: 2628 { 2629 struct drr_free *drrf = &rrd->header.drr_u.drr_free; 2630 return (receive_free(rwa, drrf)); 2631 } 2632 case DRR_SPILL: 2633 { 2634 struct drr_spill *drrs = &rrd->header.drr_u.drr_spill; 2635 err = receive_spill(rwa, drrs, rrd->payload); 2636 kmem_free(rrd->payload, rrd->payload_size); 2637 rrd->payload = NULL; 2638 return (err); 2639 } 2640 default: 2641 return (SET_ERROR(EINVAL)); 2642 } 2643} 2644 2645/* 2646 * dmu_recv_stream's worker thread; pull records off the queue, and then call 2647 * receive_process_record When we're done, signal the main thread and exit. 2648 */ 2649static void 2650receive_writer_thread(void *arg) 2651{ 2652 struct receive_writer_arg *rwa = arg; 2653 struct receive_record_arg *rrd; 2654 for (rrd = bqueue_dequeue(&rwa->q); !rrd->eos_marker; 2655 rrd = bqueue_dequeue(&rwa->q)) { 2656 /* 2657 * If there's an error, the main thread will stop putting things 2658 * on the queue, but we need to clear everything in it before we 2659 * can exit. 2660 */ 2661 if (rwa->err == 0) { 2662 rwa->err = receive_process_record(rwa, rrd); 2663 } else if (rrd->write_buf != NULL) { 2664 dmu_return_arcbuf(rrd->write_buf); 2665 rrd->write_buf = NULL; 2666 rrd->payload = NULL; 2667 } else if (rrd->payload != NULL) { 2668 kmem_free(rrd->payload, rrd->payload_size); 2669 rrd->payload = NULL; 2670 } 2671 kmem_free(rrd, sizeof (*rrd)); 2672 } 2673 kmem_free(rrd, sizeof (*rrd)); 2674 mutex_enter(&rwa->mutex); 2675 rwa->done = B_TRUE; 2676 cv_signal(&rwa->cv); 2677 mutex_exit(&rwa->mutex); 2678 thread_exit(); 2679} 2680 2681static int 2682resume_check(struct receive_arg *ra, nvlist_t *begin_nvl) 2683{ 2684 uint64_t val; 2685 objset_t *mos = dmu_objset_pool(ra->os)->dp_meta_objset; 2686 uint64_t dsobj = dmu_objset_id(ra->os); 2687 uint64_t resume_obj, resume_off; 2688 2689 if (nvlist_lookup_uint64(begin_nvl, 2690 "resume_object", &resume_obj) != 0 || 2691 nvlist_lookup_uint64(begin_nvl, 2692 "resume_offset", &resume_off) != 0) { 2693 return (SET_ERROR(EINVAL)); 2694 } 2695 VERIFY0(zap_lookup(mos, dsobj, 2696 DS_FIELD_RESUME_OBJECT, sizeof (val), 1, &val)); 2697 if (resume_obj != val) 2698 return (SET_ERROR(EINVAL)); 2699 VERIFY0(zap_lookup(mos, dsobj, 2700 DS_FIELD_RESUME_OFFSET, sizeof (val), 1, &val)); 2701 if (resume_off != val) 2702 return (SET_ERROR(EINVAL)); 2703 2704 return (0); 2705} 2706 2707 2708/* 2709 * Read in the stream's records, one by one, and apply them to the pool. There 2710 * are two threads involved; the thread that calls this function will spin up a 2711 * worker thread, read the records off the stream one by one, and issue 2712 * prefetches for any necessary indirect blocks. It will then push the records 2713 * onto an internal blocking queue. The worker thread will pull the records off 2714 * the queue, and actually write the data into the DMU. This way, the worker 2715 * thread doesn't have to wait for reads to complete, since everything it needs 2716 * (the indirect blocks) will be prefetched. 2717 * 2718 * NB: callers *must* call dmu_recv_end() if this succeeds. 2719 */ 2720int 2721dmu_recv_stream(dmu_recv_cookie_t *drc, struct file *fp, offset_t *voffp, 2722 int cleanup_fd, uint64_t *action_handlep) 2723{ 2724 int err = 0; 2725 struct receive_arg ra = { 0 }; 2726 struct receive_writer_arg rwa = { 0 }; 2727 int featureflags; 2728 nvlist_t *begin_nvl = NULL; 2729 2730 ra.byteswap = drc->drc_byteswap; 2731 ra.cksum = drc->drc_cksum; 2732 ra.td = curthread; 2733 ra.fp = fp; 2734 ra.voff = *voffp; 2735 2736 if (dsl_dataset_is_zapified(drc->drc_ds)) { 2737 (void) zap_lookup(drc->drc_ds->ds_dir->dd_pool->dp_meta_objset, 2738 drc->drc_ds->ds_object, DS_FIELD_RESUME_BYTES, 2739 sizeof (ra.bytes_read), 1, &ra.bytes_read); 2740 } 2741 2742 list_create(&ra.ignore_obj_list, sizeof (struct receive_ign_obj_node), 2743 offsetof(struct receive_ign_obj_node, node)); 2744 2745 /* these were verified in dmu_recv_begin */ 2746 ASSERT3U(DMU_GET_STREAM_HDRTYPE(drc->drc_drrb->drr_versioninfo), ==, 2747 DMU_SUBSTREAM); 2748 ASSERT3U(drc->drc_drrb->drr_type, <, DMU_OST_NUMTYPES); 2749 2750 /* 2751 * Open the objset we are modifying. 2752 */ 2753 VERIFY0(dmu_objset_from_ds(drc->drc_ds, &ra.os)); 2754 2755 ASSERT(dsl_dataset_phys(drc->drc_ds)->ds_flags & DS_FLAG_INCONSISTENT); 2756 2757 featureflags = DMU_GET_FEATUREFLAGS(drc->drc_drrb->drr_versioninfo); 2758 2759 /* if this stream is dedup'ed, set up the avl tree for guid mapping */ 2760 if (featureflags & DMU_BACKUP_FEATURE_DEDUP) { 2761 minor_t minor; 2762 2763 if (cleanup_fd == -1) { 2764 ra.err = SET_ERROR(EBADF); 2765 goto out; 2766 } 2767 ra.err = zfs_onexit_fd_hold(cleanup_fd, &minor); 2768 if (ra.err != 0) { 2769 cleanup_fd = -1; 2770 goto out; 2771 } 2772 2773 if (*action_handlep == 0) { 2774 rwa.guid_to_ds_map = 2775 kmem_alloc(sizeof (avl_tree_t), KM_SLEEP); 2776 avl_create(rwa.guid_to_ds_map, guid_compare, 2777 sizeof (guid_map_entry_t), 2778 offsetof(guid_map_entry_t, avlnode)); 2779 err = zfs_onexit_add_cb(minor, 2780 free_guid_map_onexit, rwa.guid_to_ds_map, 2781 action_handlep); 2782 if (ra.err != 0) 2783 goto out; 2784 } else { 2785 err = zfs_onexit_cb_data(minor, *action_handlep, 2786 (void **)&rwa.guid_to_ds_map); 2787 if (ra.err != 0) 2788 goto out; 2789 } 2790 2791 drc->drc_guid_to_ds_map = rwa.guid_to_ds_map; 2792 } 2793 2794 uint32_t payloadlen = drc->drc_drr_begin->drr_payloadlen; 2795 void *payload = NULL; 2796 if (payloadlen != 0) 2797 payload = kmem_alloc(payloadlen, KM_SLEEP); 2798 2799 err = receive_read_payload_and_next_header(&ra, payloadlen, payload); 2800 if (err != 0) { 2801 if (payloadlen != 0) 2802 kmem_free(payload, payloadlen); 2803 goto out; 2804 } 2805 if (payloadlen != 0) { 2806 err = nvlist_unpack(payload, payloadlen, &begin_nvl, KM_SLEEP); 2807 kmem_free(payload, payloadlen); 2808 if (err != 0) 2809 goto out; 2810 } 2811 2812 if (featureflags & DMU_BACKUP_FEATURE_RESUMING) { 2813 err = resume_check(&ra, begin_nvl); 2814 if (err != 0) 2815 goto out; 2816 } 2817 2818 (void) bqueue_init(&rwa.q, zfs_recv_queue_length, 2819 offsetof(struct receive_record_arg, node)); 2820 cv_init(&rwa.cv, NULL, CV_DEFAULT, NULL); 2821 mutex_init(&rwa.mutex, NULL, MUTEX_DEFAULT, NULL); 2822 rwa.os = ra.os; 2823 rwa.byteswap = drc->drc_byteswap; 2824 rwa.resumable = drc->drc_resumable; 2825 2826 (void) thread_create(NULL, 0, receive_writer_thread, &rwa, 0, &p0, 2827 TS_RUN, minclsyspri); 2828 /* 2829 * We're reading rwa.err without locks, which is safe since we are the 2830 * only reader, and the worker thread is the only writer. It's ok if we 2831 * miss a write for an iteration or two of the loop, since the writer 2832 * thread will keep freeing records we send it until we send it an eos 2833 * marker. 2834 * 2835 * We can leave this loop in 3 ways: First, if rwa.err is 2836 * non-zero. In that case, the writer thread will free the rrd we just 2837 * pushed. Second, if we're interrupted; in that case, either it's the 2838 * first loop and ra.rrd was never allocated, or it's later, and ra.rrd 2839 * has been handed off to the writer thread who will free it. Finally, 2840 * if receive_read_record fails or we're at the end of the stream, then 2841 * we free ra.rrd and exit. 2842 */ 2843 while (rwa.err == 0) { 2844 if (issig(JUSTLOOKING) && issig(FORREAL)) { 2845 err = SET_ERROR(EINTR); 2846 break; 2847 } 2848 2849 ASSERT3P(ra.rrd, ==, NULL); 2850 ra.rrd = ra.next_rrd; 2851 ra.next_rrd = NULL; 2852 /* Allocates and loads header into ra.next_rrd */ 2853 err = receive_read_record(&ra); 2854 2855 if (ra.rrd->header.drr_type == DRR_END || err != 0) { 2856 kmem_free(ra.rrd, sizeof (*ra.rrd)); 2857 ra.rrd = NULL; 2858 break; 2859 } 2860 2861 bqueue_enqueue(&rwa.q, ra.rrd, 2862 sizeof (struct receive_record_arg) + ra.rrd->payload_size); 2863 ra.rrd = NULL; 2864 } 2865 if (ra.next_rrd == NULL) 2866 ra.next_rrd = kmem_zalloc(sizeof (*ra.next_rrd), KM_SLEEP); 2867 ra.next_rrd->eos_marker = B_TRUE; 2868 bqueue_enqueue(&rwa.q, ra.next_rrd, 1); 2869 2870 mutex_enter(&rwa.mutex); 2871 while (!rwa.done) { 2872 cv_wait(&rwa.cv, &rwa.mutex); 2873 } 2874 mutex_exit(&rwa.mutex); 2875 2876 cv_destroy(&rwa.cv); 2877 mutex_destroy(&rwa.mutex); 2878 bqueue_destroy(&rwa.q); 2879 if (err == 0) 2880 err = rwa.err; 2881 2882out: 2883 nvlist_free(begin_nvl); 2884 if ((featureflags & DMU_BACKUP_FEATURE_DEDUP) && (cleanup_fd != -1)) 2885 zfs_onexit_fd_rele(cleanup_fd); 2886 2887 if (err != 0) { 2888 /* 2889 * Clean up references. If receive is not resumable, 2890 * destroy what we created, so we don't leave it in 2891 * the inconsistent state. 2892 */ 2893 dmu_recv_cleanup_ds(drc); 2894 } 2895 2896 *voffp = ra.voff; 2897 for (struct receive_ign_obj_node *n = 2898 list_remove_head(&ra.ignore_obj_list); n != NULL; 2899 n = list_remove_head(&ra.ignore_obj_list)) { 2900 kmem_free(n, sizeof (*n)); 2901 } 2902 list_destroy(&ra.ignore_obj_list); 2903 return (err); 2904} 2905 2906static int 2907dmu_recv_end_check(void *arg, dmu_tx_t *tx) 2908{ 2909 dmu_recv_cookie_t *drc = arg; 2910 dsl_pool_t *dp = dmu_tx_pool(tx); 2911 int error; 2912 2913 ASSERT3P(drc->drc_ds->ds_owner, ==, dmu_recv_tag); 2914 2915 if (!drc->drc_newfs) { 2916 dsl_dataset_t *origin_head; 2917 2918 error = dsl_dataset_hold(dp, drc->drc_tofs, FTAG, &origin_head); 2919 if (error != 0) 2920 return (error); 2921 if (drc->drc_force) { 2922 /* 2923 * We will destroy any snapshots in tofs (i.e. before 2924 * origin_head) that are after the origin (which is 2925 * the snap before drc_ds, because drc_ds can not 2926 * have any snaps of its own). 2927 */ 2928 uint64_t obj; 2929 2930 obj = dsl_dataset_phys(origin_head)->ds_prev_snap_obj; 2931 while (obj != 2932 dsl_dataset_phys(drc->drc_ds)->ds_prev_snap_obj) { 2933 dsl_dataset_t *snap; 2934 error = dsl_dataset_hold_obj(dp, obj, FTAG, 2935 &snap); 2936 if (error != 0) 2937 break; 2938 if (snap->ds_dir != origin_head->ds_dir) 2939 error = SET_ERROR(EINVAL); 2940 if (error == 0) { 2941 error = dsl_destroy_snapshot_check_impl( 2942 snap, B_FALSE); 2943 } 2944 obj = dsl_dataset_phys(snap)->ds_prev_snap_obj; 2945 dsl_dataset_rele(snap, FTAG); 2946 if (error != 0) 2947 break; 2948 } 2949 if (error != 0) { 2950 dsl_dataset_rele(origin_head, FTAG); 2951 return (error); 2952 } 2953 } 2954 error = dsl_dataset_clone_swap_check_impl(drc->drc_ds, 2955 origin_head, drc->drc_force, drc->drc_owner, tx); 2956 if (error != 0) { 2957 dsl_dataset_rele(origin_head, FTAG); 2958 return (error); 2959 } 2960 error = dsl_dataset_snapshot_check_impl(origin_head, 2961 drc->drc_tosnap, tx, B_TRUE, 1, drc->drc_cred); 2962 dsl_dataset_rele(origin_head, FTAG); 2963 if (error != 0) 2964 return (error); 2965 2966 error = dsl_destroy_head_check_impl(drc->drc_ds, 1); 2967 } else { 2968 error = dsl_dataset_snapshot_check_impl(drc->drc_ds, 2969 drc->drc_tosnap, tx, B_TRUE, 1, drc->drc_cred); 2970 } 2971 return (error); 2972} 2973 2974static void 2975dmu_recv_end_sync(void *arg, dmu_tx_t *tx) 2976{ 2977 dmu_recv_cookie_t *drc = arg; 2978 dsl_pool_t *dp = dmu_tx_pool(tx); 2979 2980 spa_history_log_internal_ds(drc->drc_ds, "finish receiving", 2981 tx, "snap=%s", drc->drc_tosnap); 2982 2983 if (!drc->drc_newfs) { 2984 dsl_dataset_t *origin_head; 2985 2986 VERIFY0(dsl_dataset_hold(dp, drc->drc_tofs, FTAG, 2987 &origin_head)); 2988 2989 if (drc->drc_force) { 2990 /* 2991 * Destroy any snapshots of drc_tofs (origin_head) 2992 * after the origin (the snap before drc_ds). 2993 */ 2994 uint64_t obj; 2995 2996 obj = dsl_dataset_phys(origin_head)->ds_prev_snap_obj; 2997 while (obj != 2998 dsl_dataset_phys(drc->drc_ds)->ds_prev_snap_obj) { 2999 dsl_dataset_t *snap; 3000 VERIFY0(dsl_dataset_hold_obj(dp, obj, FTAG, 3001 &snap)); 3002 ASSERT3P(snap->ds_dir, ==, origin_head->ds_dir); 3003 obj = dsl_dataset_phys(snap)->ds_prev_snap_obj; 3004 dsl_destroy_snapshot_sync_impl(snap, 3005 B_FALSE, tx); 3006 dsl_dataset_rele(snap, FTAG); 3007 } 3008 } 3009 VERIFY3P(drc->drc_ds->ds_prev, ==, 3010 origin_head->ds_prev); 3011 3012 dsl_dataset_clone_swap_sync_impl(drc->drc_ds, 3013 origin_head, tx); 3014 dsl_dataset_snapshot_sync_impl(origin_head, 3015 drc->drc_tosnap, tx); 3016 3017 /* set snapshot's creation time and guid */ 3018 dmu_buf_will_dirty(origin_head->ds_prev->ds_dbuf, tx); 3019 dsl_dataset_phys(origin_head->ds_prev)->ds_creation_time = 3020 drc->drc_drrb->drr_creation_time; 3021 dsl_dataset_phys(origin_head->ds_prev)->ds_guid = 3022 drc->drc_drrb->drr_toguid; 3023 dsl_dataset_phys(origin_head->ds_prev)->ds_flags &= 3024 ~DS_FLAG_INCONSISTENT; 3025 3026 dmu_buf_will_dirty(origin_head->ds_dbuf, tx); 3027 dsl_dataset_phys(origin_head)->ds_flags &= 3028 ~DS_FLAG_INCONSISTENT; 3029 3030 dsl_dataset_rele(origin_head, FTAG); 3031 dsl_destroy_head_sync_impl(drc->drc_ds, tx); 3032 3033 if (drc->drc_owner != NULL) 3034 VERIFY3P(origin_head->ds_owner, ==, drc->drc_owner); 3035 } else { 3036 dsl_dataset_t *ds = drc->drc_ds; 3037 3038 dsl_dataset_snapshot_sync_impl(ds, drc->drc_tosnap, tx); 3039 3040 /* set snapshot's creation time and guid */ 3041 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 3042 dsl_dataset_phys(ds->ds_prev)->ds_creation_time = 3043 drc->drc_drrb->drr_creation_time; 3044 dsl_dataset_phys(ds->ds_prev)->ds_guid = 3045 drc->drc_drrb->drr_toguid; 3046 dsl_dataset_phys(ds->ds_prev)->ds_flags &= 3047 ~DS_FLAG_INCONSISTENT; 3048 3049 dmu_buf_will_dirty(ds->ds_dbuf, tx); 3050 dsl_dataset_phys(ds)->ds_flags &= ~DS_FLAG_INCONSISTENT; 3051 if (dsl_dataset_has_resume_receive_state(ds)) { 3052 (void) zap_remove(dp->dp_meta_objset, ds->ds_object, 3053 DS_FIELD_RESUME_FROMGUID, tx); 3054 (void) zap_remove(dp->dp_meta_objset, ds->ds_object, 3055 DS_FIELD_RESUME_OBJECT, tx); 3056 (void) zap_remove(dp->dp_meta_objset, ds->ds_object, 3057 DS_FIELD_RESUME_OFFSET, tx); 3058 (void) zap_remove(dp->dp_meta_objset, ds->ds_object, 3059 DS_FIELD_RESUME_BYTES, tx); 3060 (void) zap_remove(dp->dp_meta_objset, ds->ds_object, 3061 DS_FIELD_RESUME_TOGUID, tx); 3062 (void) zap_remove(dp->dp_meta_objset, ds->ds_object, 3063 DS_FIELD_RESUME_TONAME, tx); 3064 } 3065 } 3066 drc->drc_newsnapobj = dsl_dataset_phys(drc->drc_ds)->ds_prev_snap_obj; 3067 /* 3068 * Release the hold from dmu_recv_begin. This must be done before 3069 * we return to open context, so that when we free the dataset's dnode, 3070 * we can evict its bonus buffer. 3071 */ 3072 dsl_dataset_disown(drc->drc_ds, dmu_recv_tag); 3073 drc->drc_ds = NULL; 3074} 3075 3076static int 3077add_ds_to_guidmap(const char *name, avl_tree_t *guid_map, uint64_t snapobj) 3078{ 3079 dsl_pool_t *dp; 3080 dsl_dataset_t *snapds; 3081 guid_map_entry_t *gmep; 3082 int err; 3083 3084 ASSERT(guid_map != NULL); 3085 3086 err = dsl_pool_hold(name, FTAG, &dp); 3087 if (err != 0) 3088 return (err); 3089 gmep = kmem_alloc(sizeof (*gmep), KM_SLEEP); 3090 err = dsl_dataset_hold_obj(dp, snapobj, gmep, &snapds); 3091 if (err == 0) { 3092 gmep->guid = dsl_dataset_phys(snapds)->ds_guid; 3093 gmep->gme_ds = snapds; 3094 avl_add(guid_map, gmep); 3095 dsl_dataset_long_hold(snapds, gmep); 3096 } else 3097 kmem_free(gmep, sizeof (*gmep)); 3098 3099 dsl_pool_rele(dp, FTAG); 3100 return (err); 3101} 3102 3103static int dmu_recv_end_modified_blocks = 3; 3104 3105static int 3106dmu_recv_existing_end(dmu_recv_cookie_t *drc) 3107{ 3108 int error; 3109 char name[MAXNAMELEN]; 3110 3111#ifdef _KERNEL 3112 /* 3113 * We will be destroying the ds; make sure its origin is unmounted if 3114 * necessary. 3115 */ 3116 dsl_dataset_name(drc->drc_ds, name); 3117 zfs_destroy_unmount_origin(name); 3118#endif 3119 3120 error = dsl_sync_task(drc->drc_tofs, 3121 dmu_recv_end_check, dmu_recv_end_sync, drc, 3122 dmu_recv_end_modified_blocks, ZFS_SPACE_CHECK_NORMAL); 3123 3124 if (error != 0) 3125 dmu_recv_cleanup_ds(drc); 3126 return (error); 3127} 3128 3129static int 3130dmu_recv_new_end(dmu_recv_cookie_t *drc) 3131{ 3132 int error; 3133 3134 error = dsl_sync_task(drc->drc_tofs, 3135 dmu_recv_end_check, dmu_recv_end_sync, drc, 3136 dmu_recv_end_modified_blocks, ZFS_SPACE_CHECK_NORMAL); 3137 3138 if (error != 0) { 3139 dmu_recv_cleanup_ds(drc); 3140 } else if (drc->drc_guid_to_ds_map != NULL) { 3141 (void) add_ds_to_guidmap(drc->drc_tofs, 3142 drc->drc_guid_to_ds_map, 3143 drc->drc_newsnapobj); 3144 } 3145 return (error); 3146} 3147 3148int 3149dmu_recv_end(dmu_recv_cookie_t *drc, void *owner) 3150{ 3151 drc->drc_owner = owner; 3152 3153 if (drc->drc_newfs) 3154 return (dmu_recv_new_end(drc)); 3155 else 3156 return (dmu_recv_existing_end(drc)); 3157} 3158 3159/* 3160 * Return TRUE if this objset is currently being received into. 3161 */ 3162boolean_t 3163dmu_objset_is_receiving(objset_t *os) 3164{ 3165 return (os->os_dsl_dataset != NULL && 3166 os->os_dsl_dataset->ds_owner == dmu_recv_tag); 3167} 3168