dmu_send.c revision 276081
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, 2014 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 57#ifdef __FreeBSD__ 58#undef dump_write 59#define dump_write dmu_dump_write 60#endif 61 62/* Set this tunable to TRUE to replace corrupt data with 0x2f5baddb10c */ 63int zfs_send_corrupt_data = B_FALSE; 64 65static char *dmu_recv_tag = "dmu_recv_tag"; 66static const char *recv_clone_name = "%recv"; 67 68static int 69dump_bytes(dmu_sendarg_t *dsp, void *buf, int len) 70{ 71 dsl_dataset_t *ds = dsp->dsa_os->os_dsl_dataset; 72 struct uio auio; 73 struct iovec aiov; 74 ASSERT0(len % 8); 75 76 fletcher_4_incremental_native(buf, len, &dsp->dsa_zc); 77 aiov.iov_base = buf; 78 aiov.iov_len = len; 79 auio.uio_iov = &aiov; 80 auio.uio_iovcnt = 1; 81 auio.uio_resid = len; 82 auio.uio_segflg = UIO_SYSSPACE; 83 auio.uio_rw = UIO_WRITE; 84 auio.uio_offset = (off_t)-1; 85 auio.uio_td = dsp->dsa_td; 86#ifdef _KERNEL 87 if (dsp->dsa_fp->f_type == DTYPE_VNODE) 88 bwillwrite(); 89 dsp->dsa_err = fo_write(dsp->dsa_fp, &auio, dsp->dsa_td->td_ucred, 0, 90 dsp->dsa_td); 91#else 92 fprintf(stderr, "%s: returning EOPNOTSUPP\n", __func__); 93 dsp->dsa_err = EOPNOTSUPP; 94#endif 95 mutex_enter(&ds->ds_sendstream_lock); 96 *dsp->dsa_off += len; 97 mutex_exit(&ds->ds_sendstream_lock); 98 99 return (dsp->dsa_err); 100} 101 102static int 103dump_free(dmu_sendarg_t *dsp, uint64_t object, uint64_t offset, 104 uint64_t length) 105{ 106 struct drr_free *drrf = &(dsp->dsa_drr->drr_u.drr_free); 107 108 /* 109 * When we receive a free record, dbuf_free_range() assumes 110 * that the receiving system doesn't have any dbufs in the range 111 * being freed. This is always true because there is a one-record 112 * constraint: we only send one WRITE record for any given 113 * object+offset. We know that the one-record constraint is 114 * true because we always send data in increasing order by 115 * object,offset. 116 * 117 * If the increasing-order constraint ever changes, we should find 118 * another way to assert that the one-record constraint is still 119 * satisfied. 120 */ 121 ASSERT(object > dsp->dsa_last_data_object || 122 (object == dsp->dsa_last_data_object && 123 offset > dsp->dsa_last_data_offset)); 124 125 /* 126 * If we are doing a non-incremental send, then there can't 127 * be any data in the dataset we're receiving into. Therefore 128 * a free record would simply be a no-op. Save space by not 129 * sending it to begin with. 130 */ 131 if (!dsp->dsa_incremental) 132 return (0); 133 134 if (length != -1ULL && offset + length < offset) 135 length = -1ULL; 136 137 /* 138 * If there is a pending op, but it's not PENDING_FREE, push it out, 139 * since free block aggregation can only be done for blocks of the 140 * same type (i.e., DRR_FREE records can only be aggregated with 141 * other DRR_FREE records. DRR_FREEOBJECTS records can only be 142 * aggregated with other DRR_FREEOBJECTS records. 143 */ 144 if (dsp->dsa_pending_op != PENDING_NONE && 145 dsp->dsa_pending_op != PENDING_FREE) { 146 if (dump_bytes(dsp, dsp->dsa_drr, 147 sizeof (dmu_replay_record_t)) != 0) 148 return (SET_ERROR(EINTR)); 149 dsp->dsa_pending_op = PENDING_NONE; 150 } 151 152 if (dsp->dsa_pending_op == PENDING_FREE) { 153 /* 154 * There should never be a PENDING_FREE if length is -1 155 * (because dump_dnode is the only place where this 156 * function is called with a -1, and only after flushing 157 * any pending record). 158 */ 159 ASSERT(length != -1ULL); 160 /* 161 * Check to see whether this free block can be aggregated 162 * with pending one. 163 */ 164 if (drrf->drr_object == object && drrf->drr_offset + 165 drrf->drr_length == offset) { 166 drrf->drr_length += length; 167 return (0); 168 } else { 169 /* not a continuation. Push out pending record */ 170 if (dump_bytes(dsp, dsp->dsa_drr, 171 sizeof (dmu_replay_record_t)) != 0) 172 return (SET_ERROR(EINTR)); 173 dsp->dsa_pending_op = PENDING_NONE; 174 } 175 } 176 /* create a FREE record and make it pending */ 177 bzero(dsp->dsa_drr, sizeof (dmu_replay_record_t)); 178 dsp->dsa_drr->drr_type = DRR_FREE; 179 drrf->drr_object = object; 180 drrf->drr_offset = offset; 181 drrf->drr_length = length; 182 drrf->drr_toguid = dsp->dsa_toguid; 183 if (length == -1ULL) { 184 if (dump_bytes(dsp, dsp->dsa_drr, 185 sizeof (dmu_replay_record_t)) != 0) 186 return (SET_ERROR(EINTR)); 187 } else { 188 dsp->dsa_pending_op = PENDING_FREE; 189 } 190 191 return (0); 192} 193 194static int 195dump_write(dmu_sendarg_t *dsp, dmu_object_type_t type, 196 uint64_t object, uint64_t offset, int blksz, const blkptr_t *bp, void *data) 197{ 198 struct drr_write *drrw = &(dsp->dsa_drr->drr_u.drr_write); 199 200 /* 201 * We send data in increasing object, offset order. 202 * See comment in dump_free() for details. 203 */ 204 ASSERT(object > dsp->dsa_last_data_object || 205 (object == dsp->dsa_last_data_object && 206 offset > dsp->dsa_last_data_offset)); 207 dsp->dsa_last_data_object = object; 208 dsp->dsa_last_data_offset = offset + blksz - 1; 209 210 /* 211 * If there is any kind of pending aggregation (currently either 212 * a grouping of free objects or free blocks), push it out to 213 * the stream, since aggregation can't be done across operations 214 * of different types. 215 */ 216 if (dsp->dsa_pending_op != PENDING_NONE) { 217 if (dump_bytes(dsp, dsp->dsa_drr, 218 sizeof (dmu_replay_record_t)) != 0) 219 return (SET_ERROR(EINTR)); 220 dsp->dsa_pending_op = PENDING_NONE; 221 } 222 /* write a DATA record */ 223 bzero(dsp->dsa_drr, sizeof (dmu_replay_record_t)); 224 dsp->dsa_drr->drr_type = DRR_WRITE; 225 drrw->drr_object = object; 226 drrw->drr_type = type; 227 drrw->drr_offset = offset; 228 drrw->drr_length = blksz; 229 drrw->drr_toguid = dsp->dsa_toguid; 230 if (bp == NULL || BP_IS_EMBEDDED(bp)) { 231 /* 232 * There's no pre-computed checksum for partial-block 233 * writes or embedded BP's, so (like 234 * fletcher4-checkummed blocks) userland will have to 235 * compute a dedup-capable checksum itself. 236 */ 237 drrw->drr_checksumtype = ZIO_CHECKSUM_OFF; 238 } else { 239 drrw->drr_checksumtype = BP_GET_CHECKSUM(bp); 240 if (zio_checksum_table[drrw->drr_checksumtype].ci_dedup) 241 drrw->drr_checksumflags |= DRR_CHECKSUM_DEDUP; 242 DDK_SET_LSIZE(&drrw->drr_key, BP_GET_LSIZE(bp)); 243 DDK_SET_PSIZE(&drrw->drr_key, BP_GET_PSIZE(bp)); 244 DDK_SET_COMPRESS(&drrw->drr_key, BP_GET_COMPRESS(bp)); 245 drrw->drr_key.ddk_cksum = bp->blk_cksum; 246 } 247 248 if (dump_bytes(dsp, dsp->dsa_drr, sizeof (dmu_replay_record_t)) != 0) 249 return (SET_ERROR(EINTR)); 250 if (dump_bytes(dsp, data, blksz) != 0) 251 return (SET_ERROR(EINTR)); 252 return (0); 253} 254 255static int 256dump_write_embedded(dmu_sendarg_t *dsp, uint64_t object, uint64_t offset, 257 int blksz, const blkptr_t *bp) 258{ 259 char buf[BPE_PAYLOAD_SIZE]; 260 struct drr_write_embedded *drrw = 261 &(dsp->dsa_drr->drr_u.drr_write_embedded); 262 263 if (dsp->dsa_pending_op != PENDING_NONE) { 264 if (dump_bytes(dsp, dsp->dsa_drr, 265 sizeof (dmu_replay_record_t)) != 0) 266 return (EINTR); 267 dsp->dsa_pending_op = PENDING_NONE; 268 } 269 270 ASSERT(BP_IS_EMBEDDED(bp)); 271 272 bzero(dsp->dsa_drr, sizeof (dmu_replay_record_t)); 273 dsp->dsa_drr->drr_type = DRR_WRITE_EMBEDDED; 274 drrw->drr_object = object; 275 drrw->drr_offset = offset; 276 drrw->drr_length = blksz; 277 drrw->drr_toguid = dsp->dsa_toguid; 278 drrw->drr_compression = BP_GET_COMPRESS(bp); 279 drrw->drr_etype = BPE_GET_ETYPE(bp); 280 drrw->drr_lsize = BPE_GET_LSIZE(bp); 281 drrw->drr_psize = BPE_GET_PSIZE(bp); 282 283 decode_embedded_bp_compressed(bp, buf); 284 285 if (dump_bytes(dsp, dsp->dsa_drr, sizeof (dmu_replay_record_t)) != 0) 286 return (EINTR); 287 if (dump_bytes(dsp, buf, P2ROUNDUP(drrw->drr_psize, 8)) != 0) 288 return (EINTR); 289 return (0); 290} 291 292static int 293dump_spill(dmu_sendarg_t *dsp, uint64_t object, int blksz, void *data) 294{ 295 struct drr_spill *drrs = &(dsp->dsa_drr->drr_u.drr_spill); 296 297 if (dsp->dsa_pending_op != PENDING_NONE) { 298 if (dump_bytes(dsp, dsp->dsa_drr, 299 sizeof (dmu_replay_record_t)) != 0) 300 return (SET_ERROR(EINTR)); 301 dsp->dsa_pending_op = PENDING_NONE; 302 } 303 304 /* write a SPILL record */ 305 bzero(dsp->dsa_drr, sizeof (dmu_replay_record_t)); 306 dsp->dsa_drr->drr_type = DRR_SPILL; 307 drrs->drr_object = object; 308 drrs->drr_length = blksz; 309 drrs->drr_toguid = dsp->dsa_toguid; 310 311 if (dump_bytes(dsp, dsp->dsa_drr, sizeof (dmu_replay_record_t))) 312 return (SET_ERROR(EINTR)); 313 if (dump_bytes(dsp, data, blksz)) 314 return (SET_ERROR(EINTR)); 315 return (0); 316} 317 318static int 319dump_freeobjects(dmu_sendarg_t *dsp, uint64_t firstobj, uint64_t numobjs) 320{ 321 struct drr_freeobjects *drrfo = &(dsp->dsa_drr->drr_u.drr_freeobjects); 322 323 /* See comment in dump_free(). */ 324 if (!dsp->dsa_incremental) 325 return (0); 326 327 /* 328 * If there is a pending op, but it's not PENDING_FREEOBJECTS, 329 * push it out, since free block aggregation can only be done for 330 * blocks of the same type (i.e., DRR_FREE records can only be 331 * aggregated with other DRR_FREE records. DRR_FREEOBJECTS records 332 * can only be aggregated with other DRR_FREEOBJECTS records. 333 */ 334 if (dsp->dsa_pending_op != PENDING_NONE && 335 dsp->dsa_pending_op != PENDING_FREEOBJECTS) { 336 if (dump_bytes(dsp, dsp->dsa_drr, 337 sizeof (dmu_replay_record_t)) != 0) 338 return (SET_ERROR(EINTR)); 339 dsp->dsa_pending_op = PENDING_NONE; 340 } 341 if (dsp->dsa_pending_op == PENDING_FREEOBJECTS) { 342 /* 343 * See whether this free object array can be aggregated 344 * with pending one 345 */ 346 if (drrfo->drr_firstobj + drrfo->drr_numobjs == firstobj) { 347 drrfo->drr_numobjs += numobjs; 348 return (0); 349 } else { 350 /* can't be aggregated. Push out pending record */ 351 if (dump_bytes(dsp, dsp->dsa_drr, 352 sizeof (dmu_replay_record_t)) != 0) 353 return (SET_ERROR(EINTR)); 354 dsp->dsa_pending_op = PENDING_NONE; 355 } 356 } 357 358 /* write a FREEOBJECTS record */ 359 bzero(dsp->dsa_drr, sizeof (dmu_replay_record_t)); 360 dsp->dsa_drr->drr_type = DRR_FREEOBJECTS; 361 drrfo->drr_firstobj = firstobj; 362 drrfo->drr_numobjs = numobjs; 363 drrfo->drr_toguid = dsp->dsa_toguid; 364 365 dsp->dsa_pending_op = PENDING_FREEOBJECTS; 366 367 return (0); 368} 369 370static int 371dump_dnode(dmu_sendarg_t *dsp, uint64_t object, dnode_phys_t *dnp) 372{ 373 struct drr_object *drro = &(dsp->dsa_drr->drr_u.drr_object); 374 375 if (dnp == NULL || dnp->dn_type == DMU_OT_NONE) 376 return (dump_freeobjects(dsp, object, 1)); 377 378 if (dsp->dsa_pending_op != PENDING_NONE) { 379 if (dump_bytes(dsp, dsp->dsa_drr, 380 sizeof (dmu_replay_record_t)) != 0) 381 return (SET_ERROR(EINTR)); 382 dsp->dsa_pending_op = PENDING_NONE; 383 } 384 385 /* write an OBJECT record */ 386 bzero(dsp->dsa_drr, sizeof (dmu_replay_record_t)); 387 dsp->dsa_drr->drr_type = DRR_OBJECT; 388 drro->drr_object = object; 389 drro->drr_type = dnp->dn_type; 390 drro->drr_bonustype = dnp->dn_bonustype; 391 drro->drr_blksz = dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT; 392 drro->drr_bonuslen = dnp->dn_bonuslen; 393 drro->drr_checksumtype = dnp->dn_checksum; 394 drro->drr_compress = dnp->dn_compress; 395 drro->drr_toguid = dsp->dsa_toguid; 396 397 if (!(dsp->dsa_featureflags & DMU_BACKUP_FEATURE_LARGE_BLOCKS) && 398 drro->drr_blksz > SPA_OLD_MAXBLOCKSIZE) 399 drro->drr_blksz = SPA_OLD_MAXBLOCKSIZE; 400 401 if (dump_bytes(dsp, dsp->dsa_drr, sizeof (dmu_replay_record_t)) != 0) 402 return (SET_ERROR(EINTR)); 403 404 if (dump_bytes(dsp, DN_BONUS(dnp), P2ROUNDUP(dnp->dn_bonuslen, 8)) != 0) 405 return (SET_ERROR(EINTR)); 406 407 /* Free anything past the end of the file. */ 408 if (dump_free(dsp, object, (dnp->dn_maxblkid + 1) * 409 (dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT), -1ULL) != 0) 410 return (SET_ERROR(EINTR)); 411 if (dsp->dsa_err != 0) 412 return (SET_ERROR(EINTR)); 413 return (0); 414} 415 416static boolean_t 417backup_do_embed(dmu_sendarg_t *dsp, const blkptr_t *bp) 418{ 419 if (!BP_IS_EMBEDDED(bp)) 420 return (B_FALSE); 421 422 /* 423 * Compression function must be legacy, or explicitly enabled. 424 */ 425 if ((BP_GET_COMPRESS(bp) >= ZIO_COMPRESS_LEGACY_FUNCTIONS && 426 !(dsp->dsa_featureflags & DMU_BACKUP_FEATURE_EMBED_DATA_LZ4))) 427 return (B_FALSE); 428 429 /* 430 * Embed type must be explicitly enabled. 431 */ 432 switch (BPE_GET_ETYPE(bp)) { 433 case BP_EMBEDDED_TYPE_DATA: 434 if (dsp->dsa_featureflags & DMU_BACKUP_FEATURE_EMBED_DATA) 435 return (B_TRUE); 436 break; 437 default: 438 return (B_FALSE); 439 } 440 return (B_FALSE); 441} 442 443#define BP_SPAN(dnp, level) \ 444 (((uint64_t)dnp->dn_datablkszsec) << (SPA_MINBLOCKSHIFT + \ 445 (level) * (dnp->dn_indblkshift - SPA_BLKPTRSHIFT))) 446 447/* ARGSUSED */ 448static int 449backup_cb(spa_t *spa, zilog_t *zilog, const blkptr_t *bp, 450 const zbookmark_phys_t *zb, const dnode_phys_t *dnp, void *arg) 451{ 452 dmu_sendarg_t *dsp = arg; 453 dmu_object_type_t type = bp ? BP_GET_TYPE(bp) : DMU_OT_NONE; 454 int err = 0; 455 456 if (issig(JUSTLOOKING) && issig(FORREAL)) 457 return (SET_ERROR(EINTR)); 458 459 if (zb->zb_object != DMU_META_DNODE_OBJECT && 460 DMU_OBJECT_IS_SPECIAL(zb->zb_object)) { 461 return (0); 462 } else if (zb->zb_level == ZB_ZIL_LEVEL) { 463 /* 464 * If we are sending a non-snapshot (which is allowed on 465 * read-only pools), it may have a ZIL, which must be ignored. 466 */ 467 return (0); 468 } else if (BP_IS_HOLE(bp) && 469 zb->zb_object == DMU_META_DNODE_OBJECT) { 470 uint64_t span = BP_SPAN(dnp, zb->zb_level); 471 uint64_t dnobj = (zb->zb_blkid * span) >> DNODE_SHIFT; 472 err = dump_freeobjects(dsp, dnobj, span >> DNODE_SHIFT); 473 } else if (BP_IS_HOLE(bp)) { 474 uint64_t span = BP_SPAN(dnp, zb->zb_level); 475 err = dump_free(dsp, zb->zb_object, zb->zb_blkid * span, span); 476 } else if (zb->zb_level > 0 || type == DMU_OT_OBJSET) { 477 return (0); 478 } else if (type == DMU_OT_DNODE) { 479 dnode_phys_t *blk; 480 int i; 481 int blksz = BP_GET_LSIZE(bp); 482 uint32_t aflags = ARC_WAIT; 483 arc_buf_t *abuf; 484 485 if (arc_read(NULL, spa, bp, arc_getbuf_func, &abuf, 486 ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, 487 &aflags, zb) != 0) 488 return (SET_ERROR(EIO)); 489 490 blk = abuf->b_data; 491 for (i = 0; i < blksz >> DNODE_SHIFT; i++) { 492 uint64_t dnobj = (zb->zb_blkid << 493 (DNODE_BLOCK_SHIFT - DNODE_SHIFT)) + i; 494 err = dump_dnode(dsp, dnobj, blk+i); 495 if (err != 0) 496 break; 497 } 498 (void) arc_buf_remove_ref(abuf, &abuf); 499 } else if (type == DMU_OT_SA) { 500 uint32_t aflags = ARC_WAIT; 501 arc_buf_t *abuf; 502 int blksz = BP_GET_LSIZE(bp); 503 504 if (arc_read(NULL, spa, bp, arc_getbuf_func, &abuf, 505 ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, 506 &aflags, zb) != 0) 507 return (SET_ERROR(EIO)); 508 509 err = dump_spill(dsp, zb->zb_object, blksz, abuf->b_data); 510 (void) arc_buf_remove_ref(abuf, &abuf); 511 } else if (backup_do_embed(dsp, bp)) { 512 /* it's an embedded level-0 block of a regular object */ 513 int blksz = dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT; 514 err = dump_write_embedded(dsp, zb->zb_object, 515 zb->zb_blkid * blksz, blksz, bp); 516 } else { /* it's a level-0 block of a regular object */ 517 uint32_t aflags = ARC_WAIT; 518 arc_buf_t *abuf; 519 int blksz = BP_GET_LSIZE(bp); 520 uint64_t offset; 521 522 ASSERT3U(blksz, ==, dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT); 523 ASSERT0(zb->zb_level); 524 if (arc_read(NULL, spa, bp, arc_getbuf_func, &abuf, 525 ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, 526 &aflags, zb) != 0) { 527 if (zfs_send_corrupt_data) { 528 /* Send a block filled with 0x"zfs badd bloc" */ 529 abuf = arc_buf_alloc(spa, blksz, &abuf, 530 ARC_BUFC_DATA); 531 uint64_t *ptr; 532 for (ptr = abuf->b_data; 533 (char *)ptr < (char *)abuf->b_data + blksz; 534 ptr++) 535 *ptr = 0x2f5baddb10c; 536 } else { 537 return (SET_ERROR(EIO)); 538 } 539 } 540 541 offset = zb->zb_blkid * blksz; 542 543 if (!(dsp->dsa_featureflags & 544 DMU_BACKUP_FEATURE_LARGE_BLOCKS) && 545 blksz > SPA_OLD_MAXBLOCKSIZE) { 546 char *buf = abuf->b_data; 547 while (blksz > 0 && err == 0) { 548 int n = MIN(blksz, SPA_OLD_MAXBLOCKSIZE); 549 err = dump_write(dsp, type, zb->zb_object, 550 offset, n, NULL, buf); 551 offset += n; 552 buf += n; 553 blksz -= n; 554 } 555 } else { 556 err = dump_write(dsp, type, zb->zb_object, 557 offset, blksz, bp, abuf->b_data); 558 } 559 (void) arc_buf_remove_ref(abuf, &abuf); 560 } 561 562 ASSERT(err == 0 || err == EINTR); 563 return (err); 564} 565 566/* 567 * Releases dp using the specified tag. 568 */ 569static int 570dmu_send_impl(void *tag, dsl_pool_t *dp, dsl_dataset_t *ds, 571 zfs_bookmark_phys_t *fromzb, boolean_t is_clone, boolean_t embedok, 572#ifdef illumos 573 boolean_t large_block_ok, int outfd, vnode_t *vp, offset_t *off) 574#else 575 boolean_t large_block_ok, int outfd, struct file *fp, offset_t *off) 576#endif 577{ 578 objset_t *os; 579 dmu_replay_record_t *drr; 580 dmu_sendarg_t *dsp; 581 int err; 582 uint64_t fromtxg = 0; 583 uint64_t featureflags = 0; 584 585 err = dmu_objset_from_ds(ds, &os); 586 if (err != 0) { 587 dsl_pool_rele(dp, tag); 588 return (err); 589 } 590 591 drr = kmem_zalloc(sizeof (dmu_replay_record_t), KM_SLEEP); 592 drr->drr_type = DRR_BEGIN; 593 drr->drr_u.drr_begin.drr_magic = DMU_BACKUP_MAGIC; 594 DMU_SET_STREAM_HDRTYPE(drr->drr_u.drr_begin.drr_versioninfo, 595 DMU_SUBSTREAM); 596 597#ifdef _KERNEL 598 if (dmu_objset_type(os) == DMU_OST_ZFS) { 599 uint64_t version; 600 if (zfs_get_zplprop(os, ZFS_PROP_VERSION, &version) != 0) { 601 kmem_free(drr, sizeof (dmu_replay_record_t)); 602 dsl_pool_rele(dp, tag); 603 return (SET_ERROR(EINVAL)); 604 } 605 if (version >= ZPL_VERSION_SA) { 606 featureflags |= DMU_BACKUP_FEATURE_SA_SPILL; 607 } 608 } 609#endif 610 611 if (large_block_ok && ds->ds_large_blocks) 612 featureflags |= DMU_BACKUP_FEATURE_LARGE_BLOCKS; 613 if (embedok && 614 spa_feature_is_active(dp->dp_spa, SPA_FEATURE_EMBEDDED_DATA)) { 615 featureflags |= DMU_BACKUP_FEATURE_EMBED_DATA; 616 if (spa_feature_is_active(dp->dp_spa, SPA_FEATURE_LZ4_COMPRESS)) 617 featureflags |= DMU_BACKUP_FEATURE_EMBED_DATA_LZ4; 618 } else { 619 embedok = B_FALSE; 620 } 621 622 DMU_SET_FEATUREFLAGS(drr->drr_u.drr_begin.drr_versioninfo, 623 featureflags); 624 625 drr->drr_u.drr_begin.drr_creation_time = 626 ds->ds_phys->ds_creation_time; 627 drr->drr_u.drr_begin.drr_type = dmu_objset_type(os); 628 if (is_clone) 629 drr->drr_u.drr_begin.drr_flags |= DRR_FLAG_CLONE; 630 drr->drr_u.drr_begin.drr_toguid = ds->ds_phys->ds_guid; 631 if (ds->ds_phys->ds_flags & DS_FLAG_CI_DATASET) 632 drr->drr_u.drr_begin.drr_flags |= DRR_FLAG_CI_DATA; 633 634 if (fromzb != NULL) { 635 drr->drr_u.drr_begin.drr_fromguid = fromzb->zbm_guid; 636 fromtxg = fromzb->zbm_creation_txg; 637 } 638 dsl_dataset_name(ds, drr->drr_u.drr_begin.drr_toname); 639 if (!dsl_dataset_is_snapshot(ds)) { 640 (void) strlcat(drr->drr_u.drr_begin.drr_toname, "@--head--", 641 sizeof (drr->drr_u.drr_begin.drr_toname)); 642 } 643 644 dsp = kmem_zalloc(sizeof (dmu_sendarg_t), KM_SLEEP); 645 646 dsp->dsa_drr = drr; 647 dsp->dsa_outfd = outfd; 648 dsp->dsa_proc = curproc; 649 dsp->dsa_td = curthread; 650 dsp->dsa_fp = fp; 651 dsp->dsa_os = os; 652 dsp->dsa_off = off; 653 dsp->dsa_toguid = ds->ds_phys->ds_guid; 654 ZIO_SET_CHECKSUM(&dsp->dsa_zc, 0, 0, 0, 0); 655 dsp->dsa_pending_op = PENDING_NONE; 656 dsp->dsa_incremental = (fromzb != NULL); 657 dsp->dsa_featureflags = featureflags; 658 659 mutex_enter(&ds->ds_sendstream_lock); 660 list_insert_head(&ds->ds_sendstreams, dsp); 661 mutex_exit(&ds->ds_sendstream_lock); 662 663 dsl_dataset_long_hold(ds, FTAG); 664 dsl_pool_rele(dp, tag); 665 666 if (dump_bytes(dsp, drr, sizeof (dmu_replay_record_t)) != 0) { 667 err = dsp->dsa_err; 668 goto out; 669 } 670 671 err = traverse_dataset(ds, fromtxg, TRAVERSE_PRE | TRAVERSE_PREFETCH, 672 backup_cb, dsp); 673 674 if (dsp->dsa_pending_op != PENDING_NONE) 675 if (dump_bytes(dsp, drr, sizeof (dmu_replay_record_t)) != 0) 676 err = SET_ERROR(EINTR); 677 678 if (err != 0) { 679 if (err == EINTR && dsp->dsa_err != 0) 680 err = dsp->dsa_err; 681 goto out; 682 } 683 684 bzero(drr, sizeof (dmu_replay_record_t)); 685 drr->drr_type = DRR_END; 686 drr->drr_u.drr_end.drr_checksum = dsp->dsa_zc; 687 drr->drr_u.drr_end.drr_toguid = dsp->dsa_toguid; 688 689 if (dump_bytes(dsp, drr, sizeof (dmu_replay_record_t)) != 0) { 690 err = dsp->dsa_err; 691 goto out; 692 } 693 694out: 695 mutex_enter(&ds->ds_sendstream_lock); 696 list_remove(&ds->ds_sendstreams, dsp); 697 mutex_exit(&ds->ds_sendstream_lock); 698 699 kmem_free(drr, sizeof (dmu_replay_record_t)); 700 kmem_free(dsp, sizeof (dmu_sendarg_t)); 701 702 dsl_dataset_long_rele(ds, FTAG); 703 704 return (err); 705} 706 707int 708dmu_send_obj(const char *pool, uint64_t tosnap, uint64_t fromsnap, 709 boolean_t embedok, boolean_t large_block_ok, 710#ifdef illumos 711 int outfd, vnode_t *vp, offset_t *off) 712#else 713 int outfd, struct file *fp, offset_t *off) 714#endif 715{ 716 dsl_pool_t *dp; 717 dsl_dataset_t *ds; 718 dsl_dataset_t *fromds = NULL; 719 int err; 720 721 err = dsl_pool_hold(pool, FTAG, &dp); 722 if (err != 0) 723 return (err); 724 725 err = dsl_dataset_hold_obj(dp, tosnap, FTAG, &ds); 726 if (err != 0) { 727 dsl_pool_rele(dp, FTAG); 728 return (err); 729 } 730 731 if (fromsnap != 0) { 732 zfs_bookmark_phys_t zb; 733 boolean_t is_clone; 734 735 err = dsl_dataset_hold_obj(dp, fromsnap, FTAG, &fromds); 736 if (err != 0) { 737 dsl_dataset_rele(ds, FTAG); 738 dsl_pool_rele(dp, FTAG); 739 return (err); 740 } 741 if (!dsl_dataset_is_before(ds, fromds, 0)) 742 err = SET_ERROR(EXDEV); 743 zb.zbm_creation_time = fromds->ds_phys->ds_creation_time; 744 zb.zbm_creation_txg = fromds->ds_phys->ds_creation_txg; 745 zb.zbm_guid = fromds->ds_phys->ds_guid; 746 is_clone = (fromds->ds_dir != ds->ds_dir); 747 dsl_dataset_rele(fromds, FTAG); 748 err = dmu_send_impl(FTAG, dp, ds, &zb, is_clone, 749 embedok, large_block_ok, outfd, fp, off); 750 } else { 751 err = dmu_send_impl(FTAG, dp, ds, NULL, B_FALSE, 752 embedok, large_block_ok, outfd, fp, off); 753 } 754 dsl_dataset_rele(ds, FTAG); 755 return (err); 756} 757 758int 759dmu_send(const char *tosnap, const char *fromsnap, 760 boolean_t embedok, boolean_t large_block_ok, 761#ifdef illumos 762 int outfd, vnode_t *vp, offset_t *off) 763#else 764 int outfd, struct file *fp, offset_t *off) 765#endif 766{ 767 dsl_pool_t *dp; 768 dsl_dataset_t *ds; 769 int err; 770 boolean_t owned = B_FALSE; 771 772 if (fromsnap != NULL && strpbrk(fromsnap, "@#") == NULL) 773 return (SET_ERROR(EINVAL)); 774 775 err = dsl_pool_hold(tosnap, FTAG, &dp); 776 if (err != 0) 777 return (err); 778 779 if (strchr(tosnap, '@') == NULL && spa_writeable(dp->dp_spa)) { 780 /* 781 * We are sending a filesystem or volume. Ensure 782 * that it doesn't change by owning the dataset. 783 */ 784 err = dsl_dataset_own(dp, tosnap, FTAG, &ds); 785 owned = B_TRUE; 786 } else { 787 err = dsl_dataset_hold(dp, tosnap, FTAG, &ds); 788 } 789 if (err != 0) { 790 dsl_pool_rele(dp, FTAG); 791 return (err); 792 } 793 794 if (fromsnap != NULL) { 795 zfs_bookmark_phys_t zb; 796 boolean_t is_clone = B_FALSE; 797 int fsnamelen = strchr(tosnap, '@') - tosnap; 798 799 /* 800 * If the fromsnap is in a different filesystem, then 801 * mark the send stream as a clone. 802 */ 803 if (strncmp(tosnap, fromsnap, fsnamelen) != 0 || 804 (fromsnap[fsnamelen] != '@' && 805 fromsnap[fsnamelen] != '#')) { 806 is_clone = B_TRUE; 807 } 808 809 if (strchr(fromsnap, '@')) { 810 dsl_dataset_t *fromds; 811 err = dsl_dataset_hold(dp, fromsnap, FTAG, &fromds); 812 if (err == 0) { 813 if (!dsl_dataset_is_before(ds, fromds, 0)) 814 err = SET_ERROR(EXDEV); 815 zb.zbm_creation_time = 816 fromds->ds_phys->ds_creation_time; 817 zb.zbm_creation_txg = 818 fromds->ds_phys->ds_creation_txg; 819 zb.zbm_guid = fromds->ds_phys->ds_guid; 820 is_clone = (ds->ds_dir != fromds->ds_dir); 821 dsl_dataset_rele(fromds, FTAG); 822 } 823 } else { 824 err = dsl_bookmark_lookup(dp, fromsnap, ds, &zb); 825 } 826 if (err != 0) { 827 dsl_dataset_rele(ds, FTAG); 828 dsl_pool_rele(dp, FTAG); 829 return (err); 830 } 831 err = dmu_send_impl(FTAG, dp, ds, &zb, is_clone, 832 embedok, large_block_ok, outfd, fp, off); 833 } else { 834 err = dmu_send_impl(FTAG, dp, ds, NULL, B_FALSE, 835 embedok, large_block_ok, outfd, fp, off); 836 } 837 if (owned) 838 dsl_dataset_disown(ds, FTAG); 839 else 840 dsl_dataset_rele(ds, FTAG); 841 return (err); 842} 843 844int 845dmu_send_estimate(dsl_dataset_t *ds, dsl_dataset_t *fromds, uint64_t *sizep) 846{ 847 dsl_pool_t *dp = ds->ds_dir->dd_pool; 848 int err; 849 uint64_t size; 850 851 ASSERT(dsl_pool_config_held(dp)); 852 853 /* tosnap must be a snapshot */ 854 if (!dsl_dataset_is_snapshot(ds)) 855 return (SET_ERROR(EINVAL)); 856 857 /* 858 * fromsnap must be an earlier snapshot from the same fs as tosnap, 859 * or the origin's fs. 860 */ 861 if (fromds != NULL && !dsl_dataset_is_before(ds, fromds, 0)) 862 return (SET_ERROR(EXDEV)); 863 864 /* Get uncompressed size estimate of changed data. */ 865 if (fromds == NULL) { 866 size = ds->ds_phys->ds_uncompressed_bytes; 867 } else { 868 uint64_t used, comp; 869 err = dsl_dataset_space_written(fromds, ds, 870 &used, &comp, &size); 871 if (err != 0) 872 return (err); 873 } 874 875 /* 876 * Assume that space (both on-disk and in-stream) is dominated by 877 * data. We will adjust for indirect blocks and the copies property, 878 * but ignore per-object space used (eg, dnodes and DRR_OBJECT records). 879 */ 880 881 /* 882 * Subtract out approximate space used by indirect blocks. 883 * Assume most space is used by data blocks (non-indirect, non-dnode). 884 * Assume all blocks are recordsize. Assume ditto blocks and 885 * internal fragmentation counter out compression. 886 * 887 * Therefore, space used by indirect blocks is sizeof(blkptr_t) per 888 * block, which we observe in practice. 889 */ 890 uint64_t recordsize; 891 err = dsl_prop_get_int_ds(ds, "recordsize", &recordsize); 892 if (err != 0) 893 return (err); 894 size -= size / recordsize * sizeof (blkptr_t); 895 896 /* Add in the space for the record associated with each block. */ 897 size += size / recordsize * sizeof (dmu_replay_record_t); 898 899 *sizep = size; 900 901 return (0); 902} 903 904typedef struct dmu_recv_begin_arg { 905 const char *drba_origin; 906 dmu_recv_cookie_t *drba_cookie; 907 cred_t *drba_cred; 908 uint64_t drba_snapobj; 909} dmu_recv_begin_arg_t; 910 911static int 912recv_begin_check_existing_impl(dmu_recv_begin_arg_t *drba, dsl_dataset_t *ds, 913 uint64_t fromguid) 914{ 915 uint64_t val; 916 int error; 917 dsl_pool_t *dp = ds->ds_dir->dd_pool; 918 919 /* temporary clone name must not exist */ 920 error = zap_lookup(dp->dp_meta_objset, 921 ds->ds_dir->dd_phys->dd_child_dir_zapobj, recv_clone_name, 922 8, 1, &val); 923 if (error != ENOENT) 924 return (error == 0 ? EBUSY : error); 925 926 /* new snapshot name must not exist */ 927 error = zap_lookup(dp->dp_meta_objset, 928 ds->ds_phys->ds_snapnames_zapobj, drba->drba_cookie->drc_tosnap, 929 8, 1, &val); 930 if (error != ENOENT) 931 return (error == 0 ? EEXIST : error); 932 933 /* 934 * Check snapshot limit before receiving. We'll recheck again at the 935 * end, but might as well abort before receiving if we're already over 936 * the limit. 937 * 938 * Note that we do not check the file system limit with 939 * dsl_dir_fscount_check because the temporary %clones don't count 940 * against that limit. 941 */ 942 error = dsl_fs_ss_limit_check(ds->ds_dir, 1, ZFS_PROP_SNAPSHOT_LIMIT, 943 NULL, drba->drba_cred); 944 if (error != 0) 945 return (error); 946 947 if (fromguid != 0) { 948 dsl_dataset_t *snap; 949 uint64_t obj = ds->ds_phys->ds_prev_snap_obj; 950 951 /* Find snapshot in this dir that matches fromguid. */ 952 while (obj != 0) { 953 error = dsl_dataset_hold_obj(dp, obj, FTAG, 954 &snap); 955 if (error != 0) 956 return (SET_ERROR(ENODEV)); 957 if (snap->ds_dir != ds->ds_dir) { 958 dsl_dataset_rele(snap, FTAG); 959 return (SET_ERROR(ENODEV)); 960 } 961 if (snap->ds_phys->ds_guid == fromguid) 962 break; 963 obj = snap->ds_phys->ds_prev_snap_obj; 964 dsl_dataset_rele(snap, FTAG); 965 } 966 if (obj == 0) 967 return (SET_ERROR(ENODEV)); 968 969 if (drba->drba_cookie->drc_force) { 970 drba->drba_snapobj = obj; 971 } else { 972 /* 973 * If we are not forcing, there must be no 974 * changes since fromsnap. 975 */ 976 if (dsl_dataset_modified_since_snap(ds, snap)) { 977 dsl_dataset_rele(snap, FTAG); 978 return (SET_ERROR(ETXTBSY)); 979 } 980 drba->drba_snapobj = ds->ds_prev->ds_object; 981 } 982 983 dsl_dataset_rele(snap, FTAG); 984 } else { 985 /* if full, most recent snapshot must be $ORIGIN */ 986 if (ds->ds_phys->ds_prev_snap_txg >= TXG_INITIAL) 987 return (SET_ERROR(ENODEV)); 988 drba->drba_snapobj = ds->ds_phys->ds_prev_snap_obj; 989 } 990 991 return (0); 992 993} 994 995static int 996dmu_recv_begin_check(void *arg, dmu_tx_t *tx) 997{ 998 dmu_recv_begin_arg_t *drba = arg; 999 dsl_pool_t *dp = dmu_tx_pool(tx); 1000 struct drr_begin *drrb = drba->drba_cookie->drc_drrb; 1001 uint64_t fromguid = drrb->drr_fromguid; 1002 int flags = drrb->drr_flags; 1003 int error; 1004 uint64_t featureflags = DMU_GET_FEATUREFLAGS(drrb->drr_versioninfo); 1005 dsl_dataset_t *ds; 1006 const char *tofs = drba->drba_cookie->drc_tofs; 1007 1008 /* already checked */ 1009 ASSERT3U(drrb->drr_magic, ==, DMU_BACKUP_MAGIC); 1010 1011 if (DMU_GET_STREAM_HDRTYPE(drrb->drr_versioninfo) == 1012 DMU_COMPOUNDSTREAM || 1013 drrb->drr_type >= DMU_OST_NUMTYPES || 1014 ((flags & DRR_FLAG_CLONE) && drba->drba_origin == NULL)) 1015 return (SET_ERROR(EINVAL)); 1016 1017 /* Verify pool version supports SA if SA_SPILL feature set */ 1018 if ((featureflags & DMU_BACKUP_FEATURE_SA_SPILL) && 1019 spa_version(dp->dp_spa) < SPA_VERSION_SA) 1020 return (SET_ERROR(ENOTSUP)); 1021 1022 /* 1023 * The receiving code doesn't know how to translate a WRITE_EMBEDDED 1024 * record to a plan WRITE record, so the pool must have the 1025 * EMBEDDED_DATA feature enabled if the stream has WRITE_EMBEDDED 1026 * records. Same with WRITE_EMBEDDED records that use LZ4 compression. 1027 */ 1028 if ((featureflags & DMU_BACKUP_FEATURE_EMBED_DATA) && 1029 !spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_EMBEDDED_DATA)) 1030 return (SET_ERROR(ENOTSUP)); 1031 if ((featureflags & DMU_BACKUP_FEATURE_EMBED_DATA_LZ4) && 1032 !spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_LZ4_COMPRESS)) 1033 return (SET_ERROR(ENOTSUP)); 1034 1035 /* 1036 * The receiving code doesn't know how to translate large blocks 1037 * to smaller ones, so the pool must have the LARGE_BLOCKS 1038 * feature enabled if the stream has LARGE_BLOCKS. 1039 */ 1040 if ((featureflags & DMU_BACKUP_FEATURE_LARGE_BLOCKS) && 1041 !spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_LARGE_BLOCKS)) 1042 return (SET_ERROR(ENOTSUP)); 1043 1044 error = dsl_dataset_hold(dp, tofs, FTAG, &ds); 1045 if (error == 0) { 1046 /* target fs already exists; recv into temp clone */ 1047 1048 /* Can't recv a clone into an existing fs */ 1049 if (flags & DRR_FLAG_CLONE) { 1050 dsl_dataset_rele(ds, FTAG); 1051 return (SET_ERROR(EINVAL)); 1052 } 1053 1054 error = recv_begin_check_existing_impl(drba, ds, fromguid); 1055 dsl_dataset_rele(ds, FTAG); 1056 } else if (error == ENOENT) { 1057 /* target fs does not exist; must be a full backup or clone */ 1058 char buf[MAXNAMELEN]; 1059 1060 /* 1061 * If it's a non-clone incremental, we are missing the 1062 * target fs, so fail the recv. 1063 */ 1064 if (fromguid != 0 && !(flags & DRR_FLAG_CLONE)) 1065 return (SET_ERROR(ENOENT)); 1066 1067 /* Open the parent of tofs */ 1068 ASSERT3U(strlen(tofs), <, MAXNAMELEN); 1069 (void) strlcpy(buf, tofs, strrchr(tofs, '/') - tofs + 1); 1070 error = dsl_dataset_hold(dp, buf, FTAG, &ds); 1071 if (error != 0) 1072 return (error); 1073 1074 /* 1075 * Check filesystem and snapshot limits before receiving. We'll 1076 * recheck snapshot limits again at the end (we create the 1077 * filesystems and increment those counts during begin_sync). 1078 */ 1079 error = dsl_fs_ss_limit_check(ds->ds_dir, 1, 1080 ZFS_PROP_FILESYSTEM_LIMIT, NULL, drba->drba_cred); 1081 if (error != 0) { 1082 dsl_dataset_rele(ds, FTAG); 1083 return (error); 1084 } 1085 1086 error = dsl_fs_ss_limit_check(ds->ds_dir, 1, 1087 ZFS_PROP_SNAPSHOT_LIMIT, NULL, drba->drba_cred); 1088 if (error != 0) { 1089 dsl_dataset_rele(ds, FTAG); 1090 return (error); 1091 } 1092 1093 if (drba->drba_origin != NULL) { 1094 dsl_dataset_t *origin; 1095 error = dsl_dataset_hold(dp, drba->drba_origin, 1096 FTAG, &origin); 1097 if (error != 0) { 1098 dsl_dataset_rele(ds, FTAG); 1099 return (error); 1100 } 1101 if (!dsl_dataset_is_snapshot(origin)) { 1102 dsl_dataset_rele(origin, FTAG); 1103 dsl_dataset_rele(ds, FTAG); 1104 return (SET_ERROR(EINVAL)); 1105 } 1106 if (origin->ds_phys->ds_guid != fromguid) { 1107 dsl_dataset_rele(origin, FTAG); 1108 dsl_dataset_rele(ds, FTAG); 1109 return (SET_ERROR(ENODEV)); 1110 } 1111 dsl_dataset_rele(origin, FTAG); 1112 } 1113 dsl_dataset_rele(ds, FTAG); 1114 error = 0; 1115 } 1116 return (error); 1117} 1118 1119static void 1120dmu_recv_begin_sync(void *arg, dmu_tx_t *tx) 1121{ 1122 dmu_recv_begin_arg_t *drba = arg; 1123 dsl_pool_t *dp = dmu_tx_pool(tx); 1124 struct drr_begin *drrb = drba->drba_cookie->drc_drrb; 1125 const char *tofs = drba->drba_cookie->drc_tofs; 1126 dsl_dataset_t *ds, *newds; 1127 uint64_t dsobj; 1128 int error; 1129 uint64_t crflags; 1130 1131 crflags = (drrb->drr_flags & DRR_FLAG_CI_DATA) ? 1132 DS_FLAG_CI_DATASET : 0; 1133 1134 error = dsl_dataset_hold(dp, tofs, FTAG, &ds); 1135 if (error == 0) { 1136 /* create temporary clone */ 1137 dsl_dataset_t *snap = NULL; 1138 if (drba->drba_snapobj != 0) { 1139 VERIFY0(dsl_dataset_hold_obj(dp, 1140 drba->drba_snapobj, FTAG, &snap)); 1141 } 1142 dsobj = dsl_dataset_create_sync(ds->ds_dir, recv_clone_name, 1143 snap, crflags, drba->drba_cred, tx); 1144 dsl_dataset_rele(snap, FTAG); 1145 dsl_dataset_rele(ds, FTAG); 1146 } else { 1147 dsl_dir_t *dd; 1148 const char *tail; 1149 dsl_dataset_t *origin = NULL; 1150 1151 VERIFY0(dsl_dir_hold(dp, tofs, FTAG, &dd, &tail)); 1152 1153 if (drba->drba_origin != NULL) { 1154 VERIFY0(dsl_dataset_hold(dp, drba->drba_origin, 1155 FTAG, &origin)); 1156 } 1157 1158 /* Create new dataset. */ 1159 dsobj = dsl_dataset_create_sync(dd, 1160 strrchr(tofs, '/') + 1, 1161 origin, crflags, drba->drba_cred, tx); 1162 if (origin != NULL) 1163 dsl_dataset_rele(origin, FTAG); 1164 dsl_dir_rele(dd, FTAG); 1165 drba->drba_cookie->drc_newfs = B_TRUE; 1166 } 1167 VERIFY0(dsl_dataset_own_obj(dp, dsobj, dmu_recv_tag, &newds)); 1168 1169 if ((DMU_GET_FEATUREFLAGS(drrb->drr_versioninfo) & 1170 DMU_BACKUP_FEATURE_LARGE_BLOCKS) && 1171 !newds->ds_large_blocks) { 1172 dsl_dataset_activate_large_blocks_sync_impl(dsobj, tx); 1173 newds->ds_large_blocks = B_TRUE; 1174 } 1175 1176 dmu_buf_will_dirty(newds->ds_dbuf, tx); 1177 newds->ds_phys->ds_flags |= DS_FLAG_INCONSISTENT; 1178 1179 /* 1180 * If we actually created a non-clone, we need to create the 1181 * objset in our new dataset. 1182 */ 1183 if (BP_IS_HOLE(dsl_dataset_get_blkptr(newds))) { 1184 (void) dmu_objset_create_impl(dp->dp_spa, 1185 newds, dsl_dataset_get_blkptr(newds), drrb->drr_type, tx); 1186 } 1187 1188 drba->drba_cookie->drc_ds = newds; 1189 1190 spa_history_log_internal_ds(newds, "receive", tx, ""); 1191} 1192 1193/* 1194 * NB: callers *MUST* call dmu_recv_stream() if dmu_recv_begin() 1195 * succeeds; otherwise we will leak the holds on the datasets. 1196 */ 1197int 1198dmu_recv_begin(char *tofs, char *tosnap, struct drr_begin *drrb, 1199 boolean_t force, char *origin, dmu_recv_cookie_t *drc) 1200{ 1201 dmu_recv_begin_arg_t drba = { 0 }; 1202 dmu_replay_record_t *drr; 1203 1204 bzero(drc, sizeof (dmu_recv_cookie_t)); 1205 drc->drc_drrb = drrb; 1206 drc->drc_tosnap = tosnap; 1207 drc->drc_tofs = tofs; 1208 drc->drc_force = force; 1209 drc->drc_cred = CRED(); 1210 1211 if (drrb->drr_magic == BSWAP_64(DMU_BACKUP_MAGIC)) 1212 drc->drc_byteswap = B_TRUE; 1213 else if (drrb->drr_magic != DMU_BACKUP_MAGIC) 1214 return (SET_ERROR(EINVAL)); 1215 1216 drr = kmem_zalloc(sizeof (dmu_replay_record_t), KM_SLEEP); 1217 drr->drr_type = DRR_BEGIN; 1218 drr->drr_u.drr_begin = *drc->drc_drrb; 1219 if (drc->drc_byteswap) { 1220 fletcher_4_incremental_byteswap(drr, 1221 sizeof (dmu_replay_record_t), &drc->drc_cksum); 1222 } else { 1223 fletcher_4_incremental_native(drr, 1224 sizeof (dmu_replay_record_t), &drc->drc_cksum); 1225 } 1226 kmem_free(drr, sizeof (dmu_replay_record_t)); 1227 1228 if (drc->drc_byteswap) { 1229 drrb->drr_magic = BSWAP_64(drrb->drr_magic); 1230 drrb->drr_versioninfo = BSWAP_64(drrb->drr_versioninfo); 1231 drrb->drr_creation_time = BSWAP_64(drrb->drr_creation_time); 1232 drrb->drr_type = BSWAP_32(drrb->drr_type); 1233 drrb->drr_toguid = BSWAP_64(drrb->drr_toguid); 1234 drrb->drr_fromguid = BSWAP_64(drrb->drr_fromguid); 1235 } 1236 1237 drba.drba_origin = origin; 1238 drba.drba_cookie = drc; 1239 drba.drba_cred = CRED(); 1240 1241 return (dsl_sync_task(tofs, dmu_recv_begin_check, dmu_recv_begin_sync, 1242 &drba, 5, ZFS_SPACE_CHECK_NORMAL)); 1243} 1244 1245struct restorearg { 1246 int err; 1247 boolean_t byteswap; 1248 kthread_t *td; 1249 struct file *fp; 1250 char *buf; 1251 uint64_t voff; 1252 int bufsize; /* amount of memory allocated for buf */ 1253 zio_cksum_t cksum; 1254 avl_tree_t *guid_to_ds_map; 1255}; 1256 1257typedef struct guid_map_entry { 1258 uint64_t guid; 1259 dsl_dataset_t *gme_ds; 1260 avl_node_t avlnode; 1261} guid_map_entry_t; 1262 1263static int 1264guid_compare(const void *arg1, const void *arg2) 1265{ 1266 const guid_map_entry_t *gmep1 = arg1; 1267 const guid_map_entry_t *gmep2 = arg2; 1268 1269 if (gmep1->guid < gmep2->guid) 1270 return (-1); 1271 else if (gmep1->guid > gmep2->guid) 1272 return (1); 1273 return (0); 1274} 1275 1276static void 1277free_guid_map_onexit(void *arg) 1278{ 1279 avl_tree_t *ca = arg; 1280 void *cookie = NULL; 1281 guid_map_entry_t *gmep; 1282 1283 while ((gmep = avl_destroy_nodes(ca, &cookie)) != NULL) { 1284 dsl_dataset_long_rele(gmep->gme_ds, gmep); 1285 dsl_dataset_rele(gmep->gme_ds, gmep); 1286 kmem_free(gmep, sizeof (guid_map_entry_t)); 1287 } 1288 avl_destroy(ca); 1289 kmem_free(ca, sizeof (avl_tree_t)); 1290} 1291 1292static int 1293restore_bytes(struct restorearg *ra, void *buf, int len, off_t off, ssize_t *resid) 1294{ 1295 struct uio auio; 1296 struct iovec aiov; 1297 int error; 1298 1299 aiov.iov_base = buf; 1300 aiov.iov_len = len; 1301 auio.uio_iov = &aiov; 1302 auio.uio_iovcnt = 1; 1303 auio.uio_resid = len; 1304 auio.uio_segflg = UIO_SYSSPACE; 1305 auio.uio_rw = UIO_READ; 1306 auio.uio_offset = off; 1307 auio.uio_td = ra->td; 1308#ifdef _KERNEL 1309 error = fo_read(ra->fp, &auio, ra->td->td_ucred, FOF_OFFSET, ra->td); 1310#else 1311 fprintf(stderr, "%s: returning EOPNOTSUPP\n", __func__); 1312 error = EOPNOTSUPP; 1313#endif 1314 *resid = auio.uio_resid; 1315 return (error); 1316} 1317 1318static void * 1319restore_read(struct restorearg *ra, int len, char *buf) 1320{ 1321 int done = 0; 1322 1323 if (buf == NULL) 1324 buf = ra->buf; 1325 1326 /* some things will require 8-byte alignment, so everything must */ 1327 ASSERT0(len % 8); 1328 ASSERT3U(len, <=, ra->bufsize); 1329 1330 while (done < len) { 1331 ssize_t resid; 1332 1333 ra->err = restore_bytes(ra, buf + done, 1334 len - done, ra->voff, &resid); 1335 1336 if (resid == len - done) 1337 ra->err = SET_ERROR(EINVAL); 1338 ra->voff += len - done - resid; 1339 done = len - resid; 1340 if (ra->err != 0) 1341 return (NULL); 1342 } 1343 1344 ASSERT3U(done, ==, len); 1345 if (ra->byteswap) 1346 fletcher_4_incremental_byteswap(buf, len, &ra->cksum); 1347 else 1348 fletcher_4_incremental_native(buf, len, &ra->cksum); 1349 return (buf); 1350} 1351 1352static void 1353backup_byteswap(dmu_replay_record_t *drr) 1354{ 1355#define DO64(X) (drr->drr_u.X = BSWAP_64(drr->drr_u.X)) 1356#define DO32(X) (drr->drr_u.X = BSWAP_32(drr->drr_u.X)) 1357 drr->drr_type = BSWAP_32(drr->drr_type); 1358 drr->drr_payloadlen = BSWAP_32(drr->drr_payloadlen); 1359 switch (drr->drr_type) { 1360 case DRR_BEGIN: 1361 DO64(drr_begin.drr_magic); 1362 DO64(drr_begin.drr_versioninfo); 1363 DO64(drr_begin.drr_creation_time); 1364 DO32(drr_begin.drr_type); 1365 DO32(drr_begin.drr_flags); 1366 DO64(drr_begin.drr_toguid); 1367 DO64(drr_begin.drr_fromguid); 1368 break; 1369 case DRR_OBJECT: 1370 DO64(drr_object.drr_object); 1371 DO32(drr_object.drr_type); 1372 DO32(drr_object.drr_bonustype); 1373 DO32(drr_object.drr_blksz); 1374 DO32(drr_object.drr_bonuslen); 1375 DO64(drr_object.drr_toguid); 1376 break; 1377 case DRR_FREEOBJECTS: 1378 DO64(drr_freeobjects.drr_firstobj); 1379 DO64(drr_freeobjects.drr_numobjs); 1380 DO64(drr_freeobjects.drr_toguid); 1381 break; 1382 case DRR_WRITE: 1383 DO64(drr_write.drr_object); 1384 DO32(drr_write.drr_type); 1385 DO64(drr_write.drr_offset); 1386 DO64(drr_write.drr_length); 1387 DO64(drr_write.drr_toguid); 1388 DO64(drr_write.drr_key.ddk_cksum.zc_word[0]); 1389 DO64(drr_write.drr_key.ddk_cksum.zc_word[1]); 1390 DO64(drr_write.drr_key.ddk_cksum.zc_word[2]); 1391 DO64(drr_write.drr_key.ddk_cksum.zc_word[3]); 1392 DO64(drr_write.drr_key.ddk_prop); 1393 break; 1394 case DRR_WRITE_BYREF: 1395 DO64(drr_write_byref.drr_object); 1396 DO64(drr_write_byref.drr_offset); 1397 DO64(drr_write_byref.drr_length); 1398 DO64(drr_write_byref.drr_toguid); 1399 DO64(drr_write_byref.drr_refguid); 1400 DO64(drr_write_byref.drr_refobject); 1401 DO64(drr_write_byref.drr_refoffset); 1402 DO64(drr_write_byref.drr_key.ddk_cksum.zc_word[0]); 1403 DO64(drr_write_byref.drr_key.ddk_cksum.zc_word[1]); 1404 DO64(drr_write_byref.drr_key.ddk_cksum.zc_word[2]); 1405 DO64(drr_write_byref.drr_key.ddk_cksum.zc_word[3]); 1406 DO64(drr_write_byref.drr_key.ddk_prop); 1407 break; 1408 case DRR_WRITE_EMBEDDED: 1409 DO64(drr_write_embedded.drr_object); 1410 DO64(drr_write_embedded.drr_offset); 1411 DO64(drr_write_embedded.drr_length); 1412 DO64(drr_write_embedded.drr_toguid); 1413 DO32(drr_write_embedded.drr_lsize); 1414 DO32(drr_write_embedded.drr_psize); 1415 break; 1416 case DRR_FREE: 1417 DO64(drr_free.drr_object); 1418 DO64(drr_free.drr_offset); 1419 DO64(drr_free.drr_length); 1420 DO64(drr_free.drr_toguid); 1421 break; 1422 case DRR_SPILL: 1423 DO64(drr_spill.drr_object); 1424 DO64(drr_spill.drr_length); 1425 DO64(drr_spill.drr_toguid); 1426 break; 1427 case DRR_END: 1428 DO64(drr_end.drr_checksum.zc_word[0]); 1429 DO64(drr_end.drr_checksum.zc_word[1]); 1430 DO64(drr_end.drr_checksum.zc_word[2]); 1431 DO64(drr_end.drr_checksum.zc_word[3]); 1432 DO64(drr_end.drr_toguid); 1433 break; 1434 } 1435#undef DO64 1436#undef DO32 1437} 1438 1439static inline uint8_t 1440deduce_nblkptr(dmu_object_type_t bonus_type, uint64_t bonus_size) 1441{ 1442 if (bonus_type == DMU_OT_SA) { 1443 return (1); 1444 } else { 1445 return (1 + 1446 ((DN_MAX_BONUSLEN - bonus_size) >> SPA_BLKPTRSHIFT)); 1447 } 1448} 1449 1450static int 1451restore_object(struct restorearg *ra, objset_t *os, struct drr_object *drro) 1452{ 1453 dmu_object_info_t doi; 1454 dmu_tx_t *tx; 1455 void *data = NULL; 1456 uint64_t object; 1457 int err; 1458 1459 if (drro->drr_type == DMU_OT_NONE || 1460 !DMU_OT_IS_VALID(drro->drr_type) || 1461 !DMU_OT_IS_VALID(drro->drr_bonustype) || 1462 drro->drr_checksumtype >= ZIO_CHECKSUM_FUNCTIONS || 1463 drro->drr_compress >= ZIO_COMPRESS_FUNCTIONS || 1464 P2PHASE(drro->drr_blksz, SPA_MINBLOCKSIZE) || 1465 drro->drr_blksz < SPA_MINBLOCKSIZE || 1466 drro->drr_blksz > spa_maxblocksize(dmu_objset_spa(os)) || 1467 drro->drr_bonuslen > DN_MAX_BONUSLEN) { 1468 return (SET_ERROR(EINVAL)); 1469 } 1470 1471 err = dmu_object_info(os, drro->drr_object, &doi); 1472 1473 if (err != 0 && err != ENOENT) 1474 return (SET_ERROR(EINVAL)); 1475 object = err == 0 ? drro->drr_object : DMU_NEW_OBJECT; 1476 1477 if (drro->drr_bonuslen) { 1478 data = restore_read(ra, P2ROUNDUP(drro->drr_bonuslen, 8), NULL); 1479 if (ra->err != 0) 1480 return (ra->err); 1481 } 1482 1483 /* 1484 * If we are losing blkptrs or changing the block size this must 1485 * be a new file instance. We must clear out the previous file 1486 * contents before we can change this type of metadata in the dnode. 1487 */ 1488 if (err == 0) { 1489 int nblkptr; 1490 1491 nblkptr = deduce_nblkptr(drro->drr_bonustype, 1492 drro->drr_bonuslen); 1493 1494 if (drro->drr_blksz != doi.doi_data_block_size || 1495 nblkptr < doi.doi_nblkptr) { 1496 err = dmu_free_long_range(os, drro->drr_object, 1497 0, DMU_OBJECT_END); 1498 if (err != 0) 1499 return (SET_ERROR(EINVAL)); 1500 } 1501 } 1502 1503 tx = dmu_tx_create(os); 1504 dmu_tx_hold_bonus(tx, object); 1505 err = dmu_tx_assign(tx, TXG_WAIT); 1506 if (err != 0) { 1507 dmu_tx_abort(tx); 1508 return (err); 1509 } 1510 1511 if (object == DMU_NEW_OBJECT) { 1512 /* currently free, want to be allocated */ 1513 err = dmu_object_claim(os, drro->drr_object, 1514 drro->drr_type, drro->drr_blksz, 1515 drro->drr_bonustype, drro->drr_bonuslen, tx); 1516 } else if (drro->drr_type != doi.doi_type || 1517 drro->drr_blksz != doi.doi_data_block_size || 1518 drro->drr_bonustype != doi.doi_bonus_type || 1519 drro->drr_bonuslen != doi.doi_bonus_size) { 1520 /* currently allocated, but with different properties */ 1521 err = dmu_object_reclaim(os, drro->drr_object, 1522 drro->drr_type, drro->drr_blksz, 1523 drro->drr_bonustype, drro->drr_bonuslen, tx); 1524 } 1525 if (err != 0) { 1526 dmu_tx_commit(tx); 1527 return (SET_ERROR(EINVAL)); 1528 } 1529 1530 dmu_object_set_checksum(os, drro->drr_object, drro->drr_checksumtype, 1531 tx); 1532 dmu_object_set_compress(os, drro->drr_object, drro->drr_compress, tx); 1533 1534 if (data != NULL) { 1535 dmu_buf_t *db; 1536 1537 VERIFY(0 == dmu_bonus_hold(os, drro->drr_object, FTAG, &db)); 1538 dmu_buf_will_dirty(db, tx); 1539 1540 ASSERT3U(db->db_size, >=, drro->drr_bonuslen); 1541 bcopy(data, db->db_data, drro->drr_bonuslen); 1542 if (ra->byteswap) { 1543 dmu_object_byteswap_t byteswap = 1544 DMU_OT_BYTESWAP(drro->drr_bonustype); 1545 dmu_ot_byteswap[byteswap].ob_func(db->db_data, 1546 drro->drr_bonuslen); 1547 } 1548 dmu_buf_rele(db, FTAG); 1549 } 1550 dmu_tx_commit(tx); 1551 return (0); 1552} 1553 1554/* ARGSUSED */ 1555static int 1556restore_freeobjects(struct restorearg *ra, objset_t *os, 1557 struct drr_freeobjects *drrfo) 1558{ 1559 uint64_t obj; 1560 1561 if (drrfo->drr_firstobj + drrfo->drr_numobjs < drrfo->drr_firstobj) 1562 return (SET_ERROR(EINVAL)); 1563 1564 for (obj = drrfo->drr_firstobj; 1565 obj < drrfo->drr_firstobj + drrfo->drr_numobjs; 1566 (void) dmu_object_next(os, &obj, FALSE, 0)) { 1567 int err; 1568 1569 if (dmu_object_info(os, obj, NULL) != 0) 1570 continue; 1571 1572 err = dmu_free_long_object(os, obj); 1573 if (err != 0) 1574 return (err); 1575 } 1576 return (0); 1577} 1578 1579static int 1580restore_write(struct restorearg *ra, objset_t *os, 1581 struct drr_write *drrw) 1582{ 1583 dmu_tx_t *tx; 1584 void *data; 1585 int err; 1586 1587 if (drrw->drr_offset + drrw->drr_length < drrw->drr_offset || 1588 !DMU_OT_IS_VALID(drrw->drr_type)) 1589 return (SET_ERROR(EINVAL)); 1590 1591 if (dmu_object_info(os, drrw->drr_object, NULL) != 0) 1592 return (SET_ERROR(EINVAL)); 1593 1594 dmu_buf_t *bonus; 1595 if (dmu_bonus_hold(os, drrw->drr_object, FTAG, &bonus) != 0) 1596 return (SET_ERROR(EINVAL)); 1597 1598 arc_buf_t *abuf = dmu_request_arcbuf(bonus, drrw->drr_length); 1599 1600 data = restore_read(ra, drrw->drr_length, abuf->b_data); 1601 if (data == NULL) { 1602 dmu_return_arcbuf(abuf); 1603 dmu_buf_rele(bonus, FTAG); 1604 return (ra->err); 1605 } 1606 1607 tx = dmu_tx_create(os); 1608 1609 dmu_tx_hold_write(tx, drrw->drr_object, 1610 drrw->drr_offset, drrw->drr_length); 1611 err = dmu_tx_assign(tx, TXG_WAIT); 1612 if (err != 0) { 1613 dmu_return_arcbuf(abuf); 1614 dmu_buf_rele(bonus, FTAG); 1615 dmu_tx_abort(tx); 1616 return (err); 1617 } 1618 if (ra->byteswap) { 1619 dmu_object_byteswap_t byteswap = 1620 DMU_OT_BYTESWAP(drrw->drr_type); 1621 dmu_ot_byteswap[byteswap].ob_func(data, drrw->drr_length); 1622 } 1623 dmu_assign_arcbuf(bonus, drrw->drr_offset, abuf, tx); 1624 dmu_tx_commit(tx); 1625 dmu_buf_rele(bonus, FTAG); 1626 return (0); 1627} 1628 1629/* 1630 * Handle a DRR_WRITE_BYREF record. This record is used in dedup'ed 1631 * streams to refer to a copy of the data that is already on the 1632 * system because it came in earlier in the stream. This function 1633 * finds the earlier copy of the data, and uses that copy instead of 1634 * data from the stream to fulfill this write. 1635 */ 1636static int 1637restore_write_byref(struct restorearg *ra, objset_t *os, 1638 struct drr_write_byref *drrwbr) 1639{ 1640 dmu_tx_t *tx; 1641 int err; 1642 guid_map_entry_t gmesrch; 1643 guid_map_entry_t *gmep; 1644 avl_index_t where; 1645 objset_t *ref_os = NULL; 1646 dmu_buf_t *dbp; 1647 1648 if (drrwbr->drr_offset + drrwbr->drr_length < drrwbr->drr_offset) 1649 return (SET_ERROR(EINVAL)); 1650 1651 /* 1652 * If the GUID of the referenced dataset is different from the 1653 * GUID of the target dataset, find the referenced dataset. 1654 */ 1655 if (drrwbr->drr_toguid != drrwbr->drr_refguid) { 1656 gmesrch.guid = drrwbr->drr_refguid; 1657 if ((gmep = avl_find(ra->guid_to_ds_map, &gmesrch, 1658 &where)) == NULL) { 1659 return (SET_ERROR(EINVAL)); 1660 } 1661 if (dmu_objset_from_ds(gmep->gme_ds, &ref_os)) 1662 return (SET_ERROR(EINVAL)); 1663 } else { 1664 ref_os = os; 1665 } 1666 1667 err = dmu_buf_hold(ref_os, drrwbr->drr_refobject, 1668 drrwbr->drr_refoffset, FTAG, &dbp, DMU_READ_PREFETCH); 1669 if (err != 0) 1670 return (err); 1671 1672 tx = dmu_tx_create(os); 1673 1674 dmu_tx_hold_write(tx, drrwbr->drr_object, 1675 drrwbr->drr_offset, drrwbr->drr_length); 1676 err = dmu_tx_assign(tx, TXG_WAIT); 1677 if (err != 0) { 1678 dmu_tx_abort(tx); 1679 return (err); 1680 } 1681 dmu_write(os, drrwbr->drr_object, 1682 drrwbr->drr_offset, drrwbr->drr_length, dbp->db_data, tx); 1683 dmu_buf_rele(dbp, FTAG); 1684 dmu_tx_commit(tx); 1685 return (0); 1686} 1687 1688static int 1689restore_write_embedded(struct restorearg *ra, objset_t *os, 1690 struct drr_write_embedded *drrwnp) 1691{ 1692 dmu_tx_t *tx; 1693 int err; 1694 void *data; 1695 1696 if (drrwnp->drr_offset + drrwnp->drr_length < drrwnp->drr_offset) 1697 return (EINVAL); 1698 1699 if (drrwnp->drr_psize > BPE_PAYLOAD_SIZE) 1700 return (EINVAL); 1701 1702 if (drrwnp->drr_etype >= NUM_BP_EMBEDDED_TYPES) 1703 return (EINVAL); 1704 if (drrwnp->drr_compression >= ZIO_COMPRESS_FUNCTIONS) 1705 return (EINVAL); 1706 1707 data = restore_read(ra, P2ROUNDUP(drrwnp->drr_psize, 8), NULL); 1708 if (data == NULL) 1709 return (ra->err); 1710 1711 tx = dmu_tx_create(os); 1712 1713 dmu_tx_hold_write(tx, drrwnp->drr_object, 1714 drrwnp->drr_offset, drrwnp->drr_length); 1715 err = dmu_tx_assign(tx, TXG_WAIT); 1716 if (err != 0) { 1717 dmu_tx_abort(tx); 1718 return (err); 1719 } 1720 1721 dmu_write_embedded(os, drrwnp->drr_object, 1722 drrwnp->drr_offset, data, drrwnp->drr_etype, 1723 drrwnp->drr_compression, drrwnp->drr_lsize, drrwnp->drr_psize, 1724 ra->byteswap ^ ZFS_HOST_BYTEORDER, tx); 1725 1726 dmu_tx_commit(tx); 1727 return (0); 1728} 1729 1730static int 1731restore_spill(struct restorearg *ra, objset_t *os, struct drr_spill *drrs) 1732{ 1733 dmu_tx_t *tx; 1734 void *data; 1735 dmu_buf_t *db, *db_spill; 1736 int err; 1737 1738 if (drrs->drr_length < SPA_MINBLOCKSIZE || 1739 drrs->drr_length > spa_maxblocksize(dmu_objset_spa(os))) 1740 return (SET_ERROR(EINVAL)); 1741 1742 data = restore_read(ra, drrs->drr_length, NULL); 1743 if (data == NULL) 1744 return (ra->err); 1745 1746 if (dmu_object_info(os, drrs->drr_object, NULL) != 0) 1747 return (SET_ERROR(EINVAL)); 1748 1749 VERIFY(0 == dmu_bonus_hold(os, drrs->drr_object, FTAG, &db)); 1750 if ((err = dmu_spill_hold_by_bonus(db, FTAG, &db_spill)) != 0) { 1751 dmu_buf_rele(db, FTAG); 1752 return (err); 1753 } 1754 1755 tx = dmu_tx_create(os); 1756 1757 dmu_tx_hold_spill(tx, db->db_object); 1758 1759 err = dmu_tx_assign(tx, TXG_WAIT); 1760 if (err != 0) { 1761 dmu_buf_rele(db, FTAG); 1762 dmu_buf_rele(db_spill, FTAG); 1763 dmu_tx_abort(tx); 1764 return (err); 1765 } 1766 dmu_buf_will_dirty(db_spill, tx); 1767 1768 if (db_spill->db_size < drrs->drr_length) 1769 VERIFY(0 == dbuf_spill_set_blksz(db_spill, 1770 drrs->drr_length, tx)); 1771 bcopy(data, db_spill->db_data, drrs->drr_length); 1772 1773 dmu_buf_rele(db, FTAG); 1774 dmu_buf_rele(db_spill, FTAG); 1775 1776 dmu_tx_commit(tx); 1777 return (0); 1778} 1779 1780/* ARGSUSED */ 1781static int 1782restore_free(struct restorearg *ra, objset_t *os, 1783 struct drr_free *drrf) 1784{ 1785 int err; 1786 1787 if (drrf->drr_length != -1ULL && 1788 drrf->drr_offset + drrf->drr_length < drrf->drr_offset) 1789 return (SET_ERROR(EINVAL)); 1790 1791 if (dmu_object_info(os, drrf->drr_object, NULL) != 0) 1792 return (SET_ERROR(EINVAL)); 1793 1794 err = dmu_free_long_range(os, drrf->drr_object, 1795 drrf->drr_offset, drrf->drr_length); 1796 return (err); 1797} 1798 1799/* used to destroy the drc_ds on error */ 1800static void 1801dmu_recv_cleanup_ds(dmu_recv_cookie_t *drc) 1802{ 1803 char name[MAXNAMELEN]; 1804 dsl_dataset_name(drc->drc_ds, name); 1805 dsl_dataset_disown(drc->drc_ds, dmu_recv_tag); 1806 (void) dsl_destroy_head(name); 1807} 1808 1809/* 1810 * NB: callers *must* call dmu_recv_end() if this succeeds. 1811 */ 1812int 1813dmu_recv_stream(dmu_recv_cookie_t *drc, struct file *fp, offset_t *voffp, 1814 int cleanup_fd, uint64_t *action_handlep) 1815{ 1816 struct restorearg ra = { 0 }; 1817 dmu_replay_record_t *drr; 1818 objset_t *os; 1819 zio_cksum_t pcksum; 1820 int featureflags; 1821 1822 ra.byteswap = drc->drc_byteswap; 1823 ra.cksum = drc->drc_cksum; 1824 ra.td = curthread; 1825 ra.fp = fp; 1826 ra.voff = *voffp; 1827 ra.bufsize = SPA_MAXBLOCKSIZE; 1828 ra.buf = kmem_alloc(ra.bufsize, KM_SLEEP); 1829 1830 /* these were verified in dmu_recv_begin */ 1831 ASSERT3U(DMU_GET_STREAM_HDRTYPE(drc->drc_drrb->drr_versioninfo), ==, 1832 DMU_SUBSTREAM); 1833 ASSERT3U(drc->drc_drrb->drr_type, <, DMU_OST_NUMTYPES); 1834 1835 /* 1836 * Open the objset we are modifying. 1837 */ 1838 VERIFY0(dmu_objset_from_ds(drc->drc_ds, &os)); 1839 1840 ASSERT(drc->drc_ds->ds_phys->ds_flags & DS_FLAG_INCONSISTENT); 1841 1842 featureflags = DMU_GET_FEATUREFLAGS(drc->drc_drrb->drr_versioninfo); 1843 1844 /* if this stream is dedup'ed, set up the avl tree for guid mapping */ 1845 if (featureflags & DMU_BACKUP_FEATURE_DEDUP) { 1846 minor_t minor; 1847 1848 if (cleanup_fd == -1) { 1849 ra.err = SET_ERROR(EBADF); 1850 goto out; 1851 } 1852 ra.err = zfs_onexit_fd_hold(cleanup_fd, &minor); 1853 if (ra.err != 0) { 1854 cleanup_fd = -1; 1855 goto out; 1856 } 1857 1858 if (*action_handlep == 0) { 1859 ra.guid_to_ds_map = 1860 kmem_alloc(sizeof (avl_tree_t), KM_SLEEP); 1861 avl_create(ra.guid_to_ds_map, guid_compare, 1862 sizeof (guid_map_entry_t), 1863 offsetof(guid_map_entry_t, avlnode)); 1864 ra.err = zfs_onexit_add_cb(minor, 1865 free_guid_map_onexit, ra.guid_to_ds_map, 1866 action_handlep); 1867 if (ra.err != 0) 1868 goto out; 1869 } else { 1870 ra.err = zfs_onexit_cb_data(minor, *action_handlep, 1871 (void **)&ra.guid_to_ds_map); 1872 if (ra.err != 0) 1873 goto out; 1874 } 1875 1876 drc->drc_guid_to_ds_map = ra.guid_to_ds_map; 1877 } 1878 1879 /* 1880 * Read records and process them. 1881 */ 1882 pcksum = ra.cksum; 1883 while (ra.err == 0 && 1884 NULL != (drr = restore_read(&ra, sizeof (*drr), NULL))) { 1885 if (issig(JUSTLOOKING) && issig(FORREAL)) { 1886 ra.err = SET_ERROR(EINTR); 1887 goto out; 1888 } 1889 1890 if (ra.byteswap) 1891 backup_byteswap(drr); 1892 1893 switch (drr->drr_type) { 1894 case DRR_OBJECT: 1895 { 1896 /* 1897 * We need to make a copy of the record header, 1898 * because restore_{object,write} may need to 1899 * restore_read(), which will invalidate drr. 1900 */ 1901 struct drr_object drro = drr->drr_u.drr_object; 1902 ra.err = restore_object(&ra, os, &drro); 1903 break; 1904 } 1905 case DRR_FREEOBJECTS: 1906 { 1907 struct drr_freeobjects drrfo = 1908 drr->drr_u.drr_freeobjects; 1909 ra.err = restore_freeobjects(&ra, os, &drrfo); 1910 break; 1911 } 1912 case DRR_WRITE: 1913 { 1914 struct drr_write drrw = drr->drr_u.drr_write; 1915 ra.err = restore_write(&ra, os, &drrw); 1916 break; 1917 } 1918 case DRR_WRITE_BYREF: 1919 { 1920 struct drr_write_byref drrwbr = 1921 drr->drr_u.drr_write_byref; 1922 ra.err = restore_write_byref(&ra, os, &drrwbr); 1923 break; 1924 } 1925 case DRR_WRITE_EMBEDDED: 1926 { 1927 struct drr_write_embedded drrwe = 1928 drr->drr_u.drr_write_embedded; 1929 ra.err = restore_write_embedded(&ra, os, &drrwe); 1930 break; 1931 } 1932 case DRR_FREE: 1933 { 1934 struct drr_free drrf = drr->drr_u.drr_free; 1935 ra.err = restore_free(&ra, os, &drrf); 1936 break; 1937 } 1938 case DRR_END: 1939 { 1940 struct drr_end drre = drr->drr_u.drr_end; 1941 /* 1942 * We compare against the *previous* checksum 1943 * value, because the stored checksum is of 1944 * everything before the DRR_END record. 1945 */ 1946 if (!ZIO_CHECKSUM_EQUAL(drre.drr_checksum, pcksum)) 1947 ra.err = SET_ERROR(ECKSUM); 1948 goto out; 1949 } 1950 case DRR_SPILL: 1951 { 1952 struct drr_spill drrs = drr->drr_u.drr_spill; 1953 ra.err = restore_spill(&ra, os, &drrs); 1954 break; 1955 } 1956 default: 1957 ra.err = SET_ERROR(EINVAL); 1958 goto out; 1959 } 1960 pcksum = ra.cksum; 1961 } 1962 ASSERT(ra.err != 0); 1963 1964out: 1965 if ((featureflags & DMU_BACKUP_FEATURE_DEDUP) && (cleanup_fd != -1)) 1966 zfs_onexit_fd_rele(cleanup_fd); 1967 1968 if (ra.err != 0) { 1969 /* 1970 * destroy what we created, so we don't leave it in the 1971 * inconsistent restoring state. 1972 */ 1973 dmu_recv_cleanup_ds(drc); 1974 } 1975 1976 kmem_free(ra.buf, ra.bufsize); 1977 *voffp = ra.voff; 1978 return (ra.err); 1979} 1980 1981static int 1982dmu_recv_end_check(void *arg, dmu_tx_t *tx) 1983{ 1984 dmu_recv_cookie_t *drc = arg; 1985 dsl_pool_t *dp = dmu_tx_pool(tx); 1986 int error; 1987 1988 ASSERT3P(drc->drc_ds->ds_owner, ==, dmu_recv_tag); 1989 1990 if (!drc->drc_newfs) { 1991 dsl_dataset_t *origin_head; 1992 1993 error = dsl_dataset_hold(dp, drc->drc_tofs, FTAG, &origin_head); 1994 if (error != 0) 1995 return (error); 1996 if (drc->drc_force) { 1997 /* 1998 * We will destroy any snapshots in tofs (i.e. before 1999 * origin_head) that are after the origin (which is 2000 * the snap before drc_ds, because drc_ds can not 2001 * have any snaps of its own). 2002 */ 2003 uint64_t obj = origin_head->ds_phys->ds_prev_snap_obj; 2004 while (obj != drc->drc_ds->ds_phys->ds_prev_snap_obj) { 2005 dsl_dataset_t *snap; 2006 error = dsl_dataset_hold_obj(dp, obj, FTAG, 2007 &snap); 2008 if (error != 0) 2009 return (error); 2010 if (snap->ds_dir != origin_head->ds_dir) 2011 error = SET_ERROR(EINVAL); 2012 if (error == 0) { 2013 error = dsl_destroy_snapshot_check_impl( 2014 snap, B_FALSE); 2015 } 2016 obj = snap->ds_phys->ds_prev_snap_obj; 2017 dsl_dataset_rele(snap, FTAG); 2018 if (error != 0) 2019 return (error); 2020 } 2021 } 2022 error = dsl_dataset_clone_swap_check_impl(drc->drc_ds, 2023 origin_head, drc->drc_force, drc->drc_owner, tx); 2024 if (error != 0) { 2025 dsl_dataset_rele(origin_head, FTAG); 2026 return (error); 2027 } 2028 error = dsl_dataset_snapshot_check_impl(origin_head, 2029 drc->drc_tosnap, tx, B_TRUE, 1, drc->drc_cred); 2030 dsl_dataset_rele(origin_head, FTAG); 2031 if (error != 0) 2032 return (error); 2033 2034 error = dsl_destroy_head_check_impl(drc->drc_ds, 1); 2035 } else { 2036 error = dsl_dataset_snapshot_check_impl(drc->drc_ds, 2037 drc->drc_tosnap, tx, B_TRUE, 1, drc->drc_cred); 2038 } 2039 return (error); 2040} 2041 2042static void 2043dmu_recv_end_sync(void *arg, dmu_tx_t *tx) 2044{ 2045 dmu_recv_cookie_t *drc = arg; 2046 dsl_pool_t *dp = dmu_tx_pool(tx); 2047 2048 spa_history_log_internal_ds(drc->drc_ds, "finish receiving", 2049 tx, "snap=%s", drc->drc_tosnap); 2050 2051 if (!drc->drc_newfs) { 2052 dsl_dataset_t *origin_head; 2053 2054 VERIFY0(dsl_dataset_hold(dp, drc->drc_tofs, FTAG, 2055 &origin_head)); 2056 2057 if (drc->drc_force) { 2058 /* 2059 * Destroy any snapshots of drc_tofs (origin_head) 2060 * after the origin (the snap before drc_ds). 2061 */ 2062 uint64_t obj = origin_head->ds_phys->ds_prev_snap_obj; 2063 while (obj != drc->drc_ds->ds_phys->ds_prev_snap_obj) { 2064 dsl_dataset_t *snap; 2065 VERIFY0(dsl_dataset_hold_obj(dp, obj, FTAG, 2066 &snap)); 2067 ASSERT3P(snap->ds_dir, ==, origin_head->ds_dir); 2068 obj = snap->ds_phys->ds_prev_snap_obj; 2069 dsl_destroy_snapshot_sync_impl(snap, 2070 B_FALSE, tx); 2071 dsl_dataset_rele(snap, FTAG); 2072 } 2073 } 2074 VERIFY3P(drc->drc_ds->ds_prev, ==, 2075 origin_head->ds_prev); 2076 2077 dsl_dataset_clone_swap_sync_impl(drc->drc_ds, 2078 origin_head, tx); 2079 dsl_dataset_snapshot_sync_impl(origin_head, 2080 drc->drc_tosnap, tx); 2081 2082 /* set snapshot's creation time and guid */ 2083 dmu_buf_will_dirty(origin_head->ds_prev->ds_dbuf, tx); 2084 origin_head->ds_prev->ds_phys->ds_creation_time = 2085 drc->drc_drrb->drr_creation_time; 2086 origin_head->ds_prev->ds_phys->ds_guid = 2087 drc->drc_drrb->drr_toguid; 2088 origin_head->ds_prev->ds_phys->ds_flags &= 2089 ~DS_FLAG_INCONSISTENT; 2090 2091 dmu_buf_will_dirty(origin_head->ds_dbuf, tx); 2092 origin_head->ds_phys->ds_flags &= ~DS_FLAG_INCONSISTENT; 2093 2094 dsl_dataset_rele(origin_head, FTAG); 2095 dsl_destroy_head_sync_impl(drc->drc_ds, tx); 2096 2097 if (drc->drc_owner != NULL) 2098 VERIFY3P(origin_head->ds_owner, ==, drc->drc_owner); 2099 } else { 2100 dsl_dataset_t *ds = drc->drc_ds; 2101 2102 dsl_dataset_snapshot_sync_impl(ds, drc->drc_tosnap, tx); 2103 2104 /* set snapshot's creation time and guid */ 2105 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 2106 ds->ds_prev->ds_phys->ds_creation_time = 2107 drc->drc_drrb->drr_creation_time; 2108 ds->ds_prev->ds_phys->ds_guid = drc->drc_drrb->drr_toguid; 2109 ds->ds_prev->ds_phys->ds_flags &= ~DS_FLAG_INCONSISTENT; 2110 2111 dmu_buf_will_dirty(ds->ds_dbuf, tx); 2112 ds->ds_phys->ds_flags &= ~DS_FLAG_INCONSISTENT; 2113 } 2114 drc->drc_newsnapobj = drc->drc_ds->ds_phys->ds_prev_snap_obj; 2115 /* 2116 * Release the hold from dmu_recv_begin. This must be done before 2117 * we return to open context, so that when we free the dataset's dnode, 2118 * we can evict its bonus buffer. 2119 */ 2120 dsl_dataset_disown(drc->drc_ds, dmu_recv_tag); 2121 drc->drc_ds = NULL; 2122} 2123 2124static int 2125add_ds_to_guidmap(const char *name, avl_tree_t *guid_map, uint64_t snapobj) 2126{ 2127 dsl_pool_t *dp; 2128 dsl_dataset_t *snapds; 2129 guid_map_entry_t *gmep; 2130 int err; 2131 2132 ASSERT(guid_map != NULL); 2133 2134 err = dsl_pool_hold(name, FTAG, &dp); 2135 if (err != 0) 2136 return (err); 2137 gmep = kmem_alloc(sizeof (*gmep), KM_SLEEP); 2138 err = dsl_dataset_hold_obj(dp, snapobj, gmep, &snapds); 2139 if (err == 0) { 2140 gmep->guid = snapds->ds_phys->ds_guid; 2141 gmep->gme_ds = snapds; 2142 avl_add(guid_map, gmep); 2143 dsl_dataset_long_hold(snapds, gmep); 2144 } else 2145 kmem_free(gmep, sizeof (*gmep)); 2146 2147 dsl_pool_rele(dp, FTAG); 2148 return (err); 2149} 2150 2151static int dmu_recv_end_modified_blocks = 3; 2152 2153static int 2154dmu_recv_existing_end(dmu_recv_cookie_t *drc) 2155{ 2156 int error; 2157 char name[MAXNAMELEN]; 2158 2159#ifdef _KERNEL 2160 /* 2161 * We will be destroying the ds; make sure its origin is unmounted if 2162 * necessary. 2163 */ 2164 dsl_dataset_name(drc->drc_ds, name); 2165 zfs_destroy_unmount_origin(name); 2166#endif 2167 2168 error = dsl_sync_task(drc->drc_tofs, 2169 dmu_recv_end_check, dmu_recv_end_sync, drc, 2170 dmu_recv_end_modified_blocks, ZFS_SPACE_CHECK_NORMAL); 2171 2172 if (error != 0) 2173 dmu_recv_cleanup_ds(drc); 2174 return (error); 2175} 2176 2177static int 2178dmu_recv_new_end(dmu_recv_cookie_t *drc) 2179{ 2180 int error; 2181 2182 error = dsl_sync_task(drc->drc_tofs, 2183 dmu_recv_end_check, dmu_recv_end_sync, drc, 2184 dmu_recv_end_modified_blocks, ZFS_SPACE_CHECK_NORMAL); 2185 2186 if (error != 0) { 2187 dmu_recv_cleanup_ds(drc); 2188 } else if (drc->drc_guid_to_ds_map != NULL) { 2189 (void) add_ds_to_guidmap(drc->drc_tofs, 2190 drc->drc_guid_to_ds_map, 2191 drc->drc_newsnapobj); 2192 } 2193 return (error); 2194} 2195 2196int 2197dmu_recv_end(dmu_recv_cookie_t *drc, void *owner) 2198{ 2199 drc->drc_owner = owner; 2200 2201 if (drc->drc_newfs) 2202 return (dmu_recv_new_end(drc)); 2203 else 2204 return (dmu_recv_existing_end(drc)); 2205} 2206 2207/* 2208 * Return TRUE if this objset is currently being received into. 2209 */ 2210boolean_t 2211dmu_objset_is_receiving(objset_t *os) 2212{ 2213 return (os->os_dsl_dataset != NULL && 2214 os->os_dsl_dataset->ds_owner == dmu_recv_tag); 2215} 2216