1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 23 * Copyright 2011 Nexenta Systems, Inc. All rights reserved. 24 * Copyright (c) 2013 by Delphix. All rights reserved. 25 * Copyright (c) 2012, Joyent, Inc. All rights reserved. 26 */ 27 28 #include <sys/dmu.h> 29 #include <sys/dmu_impl.h> 30 #include <sys/dmu_tx.h> 31 #include <sys/dbuf.h> 32 #include <sys/dnode.h> 33 #include <sys/zfs_context.h> 34 #include <sys/dmu_objset.h> 35 #include <sys/dmu_traverse.h> 36 #include <sys/dsl_dataset.h> 37 #include <sys/dsl_dir.h> 38 #include <sys/dsl_prop.h> 39 #include <sys/dsl_pool.h> 40 #include <sys/dsl_synctask.h> 41 #include <sys/zfs_ioctl.h> 42 #include <sys/zap.h> 43 #include <sys/zio_checksum.h> 44 #include <sys/zfs_znode.h> 45 #include <zfs_fletcher.h> 46 #include <sys/avl.h> 47 #include <sys/ddt.h> 48 #include <sys/zfs_onexit.h> 49 #include <sys/dmu_send.h> 50 #include <sys/dsl_destroy.h> 51 #include <sys/dsl_bookmark.h> 52 53 /* Set this tunable to TRUE to replace corrupt data with 0x2f5baddb10c */ 54 int zfs_send_corrupt_data = B_FALSE; 55 56 static char *dmu_recv_tag = "dmu_recv_tag"; 57 static const char *recv_clone_name = "%recv"; 58 59 static int 60 dump_bytes(dmu_sendarg_t *dsp, void *buf, int len) 61 { 62 dsl_dataset_t *ds = dsp->dsa_os->os_dsl_dataset; 63 ssize_t resid; /* have to get resid to get detailed errno */ 64 ASSERT0(len % 8); 65 66 fletcher_4_incremental_native(buf, len, &dsp->dsa_zc); 67 dsp->dsa_err = vn_rdwr(UIO_WRITE, dsp->dsa_vp, 68 (caddr_t)buf, len, 69 0, UIO_SYSSPACE, FAPPEND, RLIM64_INFINITY, CRED(), &resid); 70 71 mutex_enter(&ds->ds_sendstream_lock); 72 *dsp->dsa_off += len; 73 mutex_exit(&ds->ds_sendstream_lock); 74 75 return (dsp->dsa_err); 76 } 77 78 static int 79 dump_free(dmu_sendarg_t *dsp, uint64_t object, uint64_t offset, 80 uint64_t length) 81 { 82 struct drr_free *drrf = &(dsp->dsa_drr->drr_u.drr_free); 83 84 /* 85 * When we receive a free record, dbuf_free_range() assumes 86 * that the receiving system doesn't have any dbufs in the range 87 * being freed. This is always true because there is a one-record 88 * constraint: we only send one WRITE record for any given 89 * object+offset. We know that the one-record constraint is 90 * true because we always send data in increasing order by 91 * object,offset. 92 * 93 * If the increasing-order constraint ever changes, we should find 94 * another way to assert that the one-record constraint is still 95 * satisfied. 96 */ 97 ASSERT(object > dsp->dsa_last_data_object || 98 (object == dsp->dsa_last_data_object && 99 offset > dsp->dsa_last_data_offset)); 100 101 /* 102 * If we are doing a non-incremental send, then there can't 103 * be any data in the dataset we're receiving into. Therefore 104 * a free record would simply be a no-op. Save space by not 105 * sending it to begin with. 106 */ 107 if (!dsp->dsa_incremental) 108 return (0); 109 110 if (length != -1ULL && offset + length < offset) 111 length = -1ULL; 112 113 /* 114 * If there is a pending op, but it's not PENDING_FREE, push it out, 115 * since free block aggregation can only be done for blocks of the 116 * same type (i.e., DRR_FREE records can only be aggregated with 117 * other DRR_FREE records. DRR_FREEOBJECTS records can only be 118 * aggregated with other DRR_FREEOBJECTS records. 119 */ 120 if (dsp->dsa_pending_op != PENDING_NONE && 121 dsp->dsa_pending_op != PENDING_FREE) { 122 if (dump_bytes(dsp, dsp->dsa_drr, 123 sizeof (dmu_replay_record_t)) != 0) 124 return (SET_ERROR(EINTR)); 125 dsp->dsa_pending_op = PENDING_NONE; 126 } 127 128 if (dsp->dsa_pending_op == PENDING_FREE) { 129 /* 130 * There should never be a PENDING_FREE if length is -1 131 * (because dump_dnode is the only place where this 132 * function is called with a -1, and only after flushing 133 * any pending record). 134 */ 135 ASSERT(length != -1ULL); 136 /* 137 * Check to see whether this free block can be aggregated 138 * with pending one. 139 */ 140 if (drrf->drr_object == object && drrf->drr_offset + 141 drrf->drr_length == offset) { 142 drrf->drr_length += length; 143 return (0); 144 } else { 145 /* not a continuation. Push out pending record */ 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 /* create a FREE record and make it pending */ 153 bzero(dsp->dsa_drr, sizeof (dmu_replay_record_t)); 154 dsp->dsa_drr->drr_type = DRR_FREE; 155 drrf->drr_object = object; 156 drrf->drr_offset = offset; 157 drrf->drr_length = length; 158 drrf->drr_toguid = dsp->dsa_toguid; 159 if (length == -1ULL) { 160 if (dump_bytes(dsp, dsp->dsa_drr, 161 sizeof (dmu_replay_record_t)) != 0) 162 return (SET_ERROR(EINTR)); 163 } else { 164 dsp->dsa_pending_op = PENDING_FREE; 165 } 166 167 return (0); 168 } 169 170 static int 171 dump_data(dmu_sendarg_t *dsp, dmu_object_type_t type, 172 uint64_t object, uint64_t offset, int blksz, const blkptr_t *bp, void *data) 173 { 174 struct drr_write *drrw = &(dsp->dsa_drr->drr_u.drr_write); 175 176 /* 177 * We send data in increasing object, offset order. 178 * See comment in dump_free() for details. 179 */ 180 ASSERT(object > dsp->dsa_last_data_object || 181 (object == dsp->dsa_last_data_object && 182 offset > dsp->dsa_last_data_offset)); 183 dsp->dsa_last_data_object = object; 184 dsp->dsa_last_data_offset = offset + blksz - 1; 185 186 /* 187 * If there is any kind of pending aggregation (currently either 188 * a grouping of free objects or free blocks), push it out to 189 * the stream, since aggregation can't be done across operations 190 * of different types. 191 */ 192 if (dsp->dsa_pending_op != PENDING_NONE) { 193 if (dump_bytes(dsp, dsp->dsa_drr, 194 sizeof (dmu_replay_record_t)) != 0) 195 return (SET_ERROR(EINTR)); 196 dsp->dsa_pending_op = PENDING_NONE; 197 } 198 /* write a DATA record */ 199 bzero(dsp->dsa_drr, sizeof (dmu_replay_record_t)); 200 dsp->dsa_drr->drr_type = DRR_WRITE; 201 drrw->drr_object = object; 202 drrw->drr_type = type; 203 drrw->drr_offset = offset; 204 drrw->drr_length = blksz; 205 drrw->drr_toguid = dsp->dsa_toguid; 206 drrw->drr_checksumtype = BP_GET_CHECKSUM(bp); 207 if (zio_checksum_table[drrw->drr_checksumtype].ci_dedup) 208 drrw->drr_checksumflags |= DRR_CHECKSUM_DEDUP; 209 DDK_SET_LSIZE(&drrw->drr_key, BP_GET_LSIZE(bp)); 210 DDK_SET_PSIZE(&drrw->drr_key, BP_GET_PSIZE(bp)); 211 DDK_SET_COMPRESS(&drrw->drr_key, BP_GET_COMPRESS(bp)); 212 drrw->drr_key.ddk_cksum = bp->blk_cksum; 213 214 if (dump_bytes(dsp, dsp->dsa_drr, sizeof (dmu_replay_record_t)) != 0) 215 return (SET_ERROR(EINTR)); 216 if (dump_bytes(dsp, data, blksz) != 0) 217 return (SET_ERROR(EINTR)); 218 return (0); 219 } 220 221 static int 222 dump_spill(dmu_sendarg_t *dsp, uint64_t object, int blksz, void *data) 223 { 224 struct drr_spill *drrs = &(dsp->dsa_drr->drr_u.drr_spill); 225 226 if (dsp->dsa_pending_op != PENDING_NONE) { 227 if (dump_bytes(dsp, dsp->dsa_drr, 228 sizeof (dmu_replay_record_t)) != 0) 229 return (SET_ERROR(EINTR)); 230 dsp->dsa_pending_op = PENDING_NONE; 231 } 232 233 /* write a SPILL record */ 234 bzero(dsp->dsa_drr, sizeof (dmu_replay_record_t)); 235 dsp->dsa_drr->drr_type = DRR_SPILL; 236 drrs->drr_object = object; 237 drrs->drr_length = blksz; 238 drrs->drr_toguid = dsp->dsa_toguid; 239 240 if (dump_bytes(dsp, dsp->dsa_drr, sizeof (dmu_replay_record_t))) 241 return (SET_ERROR(EINTR)); 242 if (dump_bytes(dsp, data, blksz)) 243 return (SET_ERROR(EINTR)); 244 return (0); 245 } 246 247 static int 248 dump_freeobjects(dmu_sendarg_t *dsp, uint64_t firstobj, uint64_t numobjs) 249 { 250 struct drr_freeobjects *drrfo = &(dsp->dsa_drr->drr_u.drr_freeobjects); 251 252 /* See comment in dump_free(). */ 253 if (!dsp->dsa_incremental) 254 return (0); 255 256 /* 257 * If there is a pending op, but it's not PENDING_FREEOBJECTS, 258 * push it out, since free block aggregation can only be done for 259 * blocks of the same type (i.e., DRR_FREE records can only be 260 * aggregated with other DRR_FREE records. DRR_FREEOBJECTS records 261 * can only be aggregated with other DRR_FREEOBJECTS records. 262 */ 263 if (dsp->dsa_pending_op != PENDING_NONE && 264 dsp->dsa_pending_op != PENDING_FREEOBJECTS) { 265 if (dump_bytes(dsp, dsp->dsa_drr, 266 sizeof (dmu_replay_record_t)) != 0) 267 return (SET_ERROR(EINTR)); 268 dsp->dsa_pending_op = PENDING_NONE; 269 } 270 if (dsp->dsa_pending_op == PENDING_FREEOBJECTS) { 271 /* 272 * See whether this free object array can be aggregated 273 * with pending one 274 */ 275 if (drrfo->drr_firstobj + drrfo->drr_numobjs == firstobj) { 276 drrfo->drr_numobjs += numobjs; 277 return (0); 278 } else { 279 /* can't be aggregated. Push out pending record */ 280 if (dump_bytes(dsp, dsp->dsa_drr, 281 sizeof (dmu_replay_record_t)) != 0) 282 return (SET_ERROR(EINTR)); 283 dsp->dsa_pending_op = PENDING_NONE; 284 } 285 } 286 287 /* write a FREEOBJECTS record */ 288 bzero(dsp->dsa_drr, sizeof (dmu_replay_record_t)); 289 dsp->dsa_drr->drr_type = DRR_FREEOBJECTS; 290 drrfo->drr_firstobj = firstobj; 291 drrfo->drr_numobjs = numobjs; 292 drrfo->drr_toguid = dsp->dsa_toguid; 293 294 dsp->dsa_pending_op = PENDING_FREEOBJECTS; 295 296 return (0); 297 } 298 299 static int 300 dump_dnode(dmu_sendarg_t *dsp, uint64_t object, dnode_phys_t *dnp) 301 { 302 struct drr_object *drro = &(dsp->dsa_drr->drr_u.drr_object); 303 304 if (dnp == NULL || dnp->dn_type == DMU_OT_NONE) 305 return (dump_freeobjects(dsp, object, 1)); 306 307 if (dsp->dsa_pending_op != PENDING_NONE) { 308 if (dump_bytes(dsp, dsp->dsa_drr, 309 sizeof (dmu_replay_record_t)) != 0) 310 return (SET_ERROR(EINTR)); 311 dsp->dsa_pending_op = PENDING_NONE; 312 } 313 314 /* write an OBJECT record */ 315 bzero(dsp->dsa_drr, sizeof (dmu_replay_record_t)); 316 dsp->dsa_drr->drr_type = DRR_OBJECT; 317 drro->drr_object = object; 318 drro->drr_type = dnp->dn_type; 319 drro->drr_bonustype = dnp->dn_bonustype; 320 drro->drr_blksz = dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT; 321 drro->drr_bonuslen = dnp->dn_bonuslen; 322 drro->drr_checksumtype = dnp->dn_checksum; 323 drro->drr_compress = dnp->dn_compress; 324 drro->drr_toguid = dsp->dsa_toguid; 325 326 if (dump_bytes(dsp, dsp->dsa_drr, sizeof (dmu_replay_record_t)) != 0) 327 return (SET_ERROR(EINTR)); 328 329 if (dump_bytes(dsp, DN_BONUS(dnp), P2ROUNDUP(dnp->dn_bonuslen, 8)) != 0) 330 return (SET_ERROR(EINTR)); 331 332 /* Free anything past the end of the file. */ 333 if (dump_free(dsp, object, (dnp->dn_maxblkid + 1) * 334 (dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT), -1ULL) != 0) 335 return (SET_ERROR(EINTR)); 336 if (dsp->dsa_err != 0) 337 return (SET_ERROR(EINTR)); 338 return (0); 339 } 340 341 #define BP_SPAN(dnp, level) \ 342 (((uint64_t)dnp->dn_datablkszsec) << (SPA_MINBLOCKSHIFT + \ 343 (level) * (dnp->dn_indblkshift - SPA_BLKPTRSHIFT))) 344 345 /* ARGSUSED */ 346 static int 347 backup_cb(spa_t *spa, zilog_t *zilog, const blkptr_t *bp, 348 const zbookmark_t *zb, const dnode_phys_t *dnp, void *arg) 349 { 350 dmu_sendarg_t *dsp = arg; 351 dmu_object_type_t type = bp ? BP_GET_TYPE(bp) : DMU_OT_NONE; 352 int err = 0; 353 354 if (issig(JUSTLOOKING) && issig(FORREAL)) 355 return (SET_ERROR(EINTR)); 356 357 if (zb->zb_object != DMU_META_DNODE_OBJECT && 358 DMU_OBJECT_IS_SPECIAL(zb->zb_object)) { 359 return (0); 360 } else if (zb->zb_level == ZB_ZIL_LEVEL) { 361 /* 362 * If we are sending a non-snapshot (which is allowed on 363 * read-only pools), it may have a ZIL, which must be ignored. 364 */ 365 return (0); 366 } else if (BP_IS_HOLE(bp) && 367 zb->zb_object == DMU_META_DNODE_OBJECT) { 368 uint64_t span = BP_SPAN(dnp, zb->zb_level); 369 uint64_t dnobj = (zb->zb_blkid * span) >> DNODE_SHIFT; 370 err = dump_freeobjects(dsp, dnobj, span >> DNODE_SHIFT); 371 } else if (BP_IS_HOLE(bp)) { 372 uint64_t span = BP_SPAN(dnp, zb->zb_level); 373 err = dump_free(dsp, zb->zb_object, zb->zb_blkid * span, span); 374 } else if (zb->zb_level > 0 || type == DMU_OT_OBJSET) { 375 return (0); 376 } else if (type == DMU_OT_DNODE) { 377 dnode_phys_t *blk; 378 int i; 379 int blksz = BP_GET_LSIZE(bp); 380 uint32_t aflags = ARC_WAIT; 381 arc_buf_t *abuf; 382 383 if (arc_read(NULL, spa, bp, arc_getbuf_func, &abuf, 384 ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, 385 &aflags, zb) != 0) 386 return (SET_ERROR(EIO)); 387 388 blk = abuf->b_data; 389 for (i = 0; i < blksz >> DNODE_SHIFT; i++) { 390 uint64_t dnobj = (zb->zb_blkid << 391 (DNODE_BLOCK_SHIFT - DNODE_SHIFT)) + i; 392 err = dump_dnode(dsp, dnobj, blk+i); 393 if (err != 0) 394 break; 395 } 396 (void) arc_buf_remove_ref(abuf, &abuf); 397 } else if (type == DMU_OT_SA) { 398 uint32_t aflags = ARC_WAIT; 399 arc_buf_t *abuf; 400 int blksz = BP_GET_LSIZE(bp); 401 402 if (arc_read(NULL, spa, bp, arc_getbuf_func, &abuf, 403 ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, 404 &aflags, zb) != 0) 405 return (SET_ERROR(EIO)); 406 407 err = dump_spill(dsp, zb->zb_object, blksz, abuf->b_data); 408 (void) arc_buf_remove_ref(abuf, &abuf); 409 } else { /* it's a level-0 block of a regular object */ 410 uint32_t aflags = ARC_WAIT; 411 arc_buf_t *abuf; 412 int blksz = BP_GET_LSIZE(bp); 413 414 ASSERT0(zb->zb_level); 415 if (arc_read(NULL, spa, bp, arc_getbuf_func, &abuf, 416 ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, 417 &aflags, zb) != 0) { 418 if (zfs_send_corrupt_data) { 419 /* Send a block filled with 0x"zfs badd bloc" */ 420 abuf = arc_buf_alloc(spa, blksz, &abuf, 421 ARC_BUFC_DATA); 422 uint64_t *ptr; 423 for (ptr = abuf->b_data; 424 (char *)ptr < (char *)abuf->b_data + blksz; 425 ptr++) 426 *ptr = 0x2f5baddb10c; 427 } else { 428 return (SET_ERROR(EIO)); 429 } 430 } 431 432 err = dump_data(dsp, type, zb->zb_object, zb->zb_blkid * blksz, 433 blksz, bp, abuf->b_data); 434 (void) arc_buf_remove_ref(abuf, &abuf); 435 } 436 437 ASSERT(err == 0 || err == EINTR); 438 return (err); 439 } 440 441 /* 442 * Releases dp using the specified tag. 443 */ 444 static int 445 dmu_send_impl(void *tag, dsl_pool_t *dp, dsl_dataset_t *ds, 446 zfs_bookmark_phys_t *fromzb, boolean_t is_clone, int outfd, 447 vnode_t *vp, offset_t *off) 448 { 449 objset_t *os; 450 dmu_replay_record_t *drr; 451 dmu_sendarg_t *dsp; 452 int err; 453 uint64_t fromtxg = 0; 454 455 err = dmu_objset_from_ds(ds, &os); 456 if (err != 0) { 457 dsl_pool_rele(dp, tag); 458 return (err); 459 } 460 461 drr = kmem_zalloc(sizeof (dmu_replay_record_t), KM_SLEEP); 462 drr->drr_type = DRR_BEGIN; 463 drr->drr_u.drr_begin.drr_magic = DMU_BACKUP_MAGIC; 464 DMU_SET_STREAM_HDRTYPE(drr->drr_u.drr_begin.drr_versioninfo, 465 DMU_SUBSTREAM); 466 467 #ifdef _KERNEL 468 if (dmu_objset_type(os) == DMU_OST_ZFS) { 469 uint64_t version; 470 if (zfs_get_zplprop(os, ZFS_PROP_VERSION, &version) != 0) { 471 kmem_free(drr, sizeof (dmu_replay_record_t)); 472 dsl_pool_rele(dp, tag); 473 return (SET_ERROR(EINVAL)); 474 } 475 if (version >= ZPL_VERSION_SA) { 476 DMU_SET_FEATUREFLAGS( 477 drr->drr_u.drr_begin.drr_versioninfo, 478 DMU_BACKUP_FEATURE_SA_SPILL); 479 } 480 } 481 #endif 482 483 drr->drr_u.drr_begin.drr_creation_time = 484 ds->ds_phys->ds_creation_time; 485 drr->drr_u.drr_begin.drr_type = dmu_objset_type(os); 486 if (is_clone) 487 drr->drr_u.drr_begin.drr_flags |= DRR_FLAG_CLONE; 488 drr->drr_u.drr_begin.drr_toguid = ds->ds_phys->ds_guid; 489 if (ds->ds_phys->ds_flags & DS_FLAG_CI_DATASET) 490 drr->drr_u.drr_begin.drr_flags |= DRR_FLAG_CI_DATA; 491 492 if (fromzb != NULL) { 493 drr->drr_u.drr_begin.drr_fromguid = fromzb->zbm_guid; 494 fromtxg = fromzb->zbm_creation_txg; 495 } 496 dsl_dataset_name(ds, drr->drr_u.drr_begin.drr_toname); 497 if (!dsl_dataset_is_snapshot(ds)) { 498 (void) strlcat(drr->drr_u.drr_begin.drr_toname, "@--head--", 499 sizeof (drr->drr_u.drr_begin.drr_toname)); 500 } 501 502 dsp = kmem_zalloc(sizeof (dmu_sendarg_t), KM_SLEEP); 503 504 dsp->dsa_drr = drr; 505 dsp->dsa_vp = vp; 506 dsp->dsa_outfd = outfd; 507 dsp->dsa_proc = curproc; 508 dsp->dsa_os = os; 509 dsp->dsa_off = off; 510 dsp->dsa_toguid = ds->ds_phys->ds_guid; 511 ZIO_SET_CHECKSUM(&dsp->dsa_zc, 0, 0, 0, 0); 512 dsp->dsa_pending_op = PENDING_NONE; 513 dsp->dsa_incremental = (fromzb != NULL); 514 515 mutex_enter(&ds->ds_sendstream_lock); 516 list_insert_head(&ds->ds_sendstreams, dsp); 517 mutex_exit(&ds->ds_sendstream_lock); 518 519 dsl_dataset_long_hold(ds, FTAG); 520 dsl_pool_rele(dp, tag); 521 522 if (dump_bytes(dsp, drr, sizeof (dmu_replay_record_t)) != 0) { 523 err = dsp->dsa_err; 524 goto out; 525 } 526 527 err = traverse_dataset(ds, fromtxg, TRAVERSE_PRE | TRAVERSE_PREFETCH, 528 backup_cb, dsp); 529 530 if (dsp->dsa_pending_op != PENDING_NONE) 531 if (dump_bytes(dsp, drr, sizeof (dmu_replay_record_t)) != 0) 532 err = SET_ERROR(EINTR); 533 534 if (err != 0) { 535 if (err == EINTR && dsp->dsa_err != 0) 536 err = dsp->dsa_err; 537 goto out; 538 } 539 540 bzero(drr, sizeof (dmu_replay_record_t)); 541 drr->drr_type = DRR_END; 542 drr->drr_u.drr_end.drr_checksum = dsp->dsa_zc; 543 drr->drr_u.drr_end.drr_toguid = dsp->dsa_toguid; 544 545 if (dump_bytes(dsp, drr, sizeof (dmu_replay_record_t)) != 0) { 546 err = dsp->dsa_err; 547 goto out; 548 } 549 550 out: 551 mutex_enter(&ds->ds_sendstream_lock); 552 list_remove(&ds->ds_sendstreams, dsp); 553 mutex_exit(&ds->ds_sendstream_lock); 554 555 kmem_free(drr, sizeof (dmu_replay_record_t)); 556 kmem_free(dsp, sizeof (dmu_sendarg_t)); 557 558 dsl_dataset_long_rele(ds, FTAG); 559 560 return (err); 561 } 562 563 int 564 dmu_send_obj(const char *pool, uint64_t tosnap, uint64_t fromsnap, 565 int outfd, vnode_t *vp, offset_t *off) 566 { 567 dsl_pool_t *dp; 568 dsl_dataset_t *ds; 569 dsl_dataset_t *fromds = NULL; 570 int err; 571 572 err = dsl_pool_hold(pool, FTAG, &dp); 573 if (err != 0) 574 return (err); 575 576 err = dsl_dataset_hold_obj(dp, tosnap, FTAG, &ds); 577 if (err != 0) { 578 dsl_pool_rele(dp, FTAG); 579 return (err); 580 } 581 582 if (fromsnap != 0) { 583 zfs_bookmark_phys_t zb; 584 boolean_t is_clone; 585 586 err = dsl_dataset_hold_obj(dp, fromsnap, FTAG, &fromds); 587 if (err != 0) { 588 dsl_dataset_rele(ds, FTAG); 589 dsl_pool_rele(dp, FTAG); 590 return (err); 591 } 592 if (!dsl_dataset_is_before(ds, fromds, 0)) 593 err = SET_ERROR(EXDEV); 594 zb.zbm_creation_time = fromds->ds_phys->ds_creation_time; 595 zb.zbm_creation_txg = fromds->ds_phys->ds_creation_txg; 596 zb.zbm_guid = fromds->ds_phys->ds_guid; 597 is_clone = (fromds->ds_dir != ds->ds_dir); 598 dsl_dataset_rele(fromds, FTAG); 599 err = dmu_send_impl(FTAG, dp, ds, &zb, is_clone, 600 outfd, vp, off); 601 } else { 602 err = dmu_send_impl(FTAG, dp, ds, NULL, B_FALSE, 603 outfd, vp, off); 604 } 605 dsl_dataset_rele(ds, FTAG); 606 return (err); 607 } 608 609 int 610 dmu_send(const char *tosnap, const char *fromsnap, 611 int outfd, vnode_t *vp, offset_t *off) 612 { 613 dsl_pool_t *dp; 614 dsl_dataset_t *ds; 615 int err; 616 boolean_t owned = B_FALSE; 617 618 if (fromsnap != NULL && strpbrk(fromsnap, "@#") == NULL) 619 return (SET_ERROR(EINVAL)); 620 621 err = dsl_pool_hold(tosnap, FTAG, &dp); 622 if (err != 0) 623 return (err); 624 625 if (strchr(tosnap, '@') == NULL && spa_writeable(dp->dp_spa)) { 626 /* 627 * We are sending a filesystem or volume. Ensure 628 * that it doesn't change by owning the dataset. 629 */ 630 err = dsl_dataset_own(dp, tosnap, FTAG, &ds); 631 owned = B_TRUE; 632 } else { 633 err = dsl_dataset_hold(dp, tosnap, FTAG, &ds); 634 } 635 if (err != 0) { 636 dsl_pool_rele(dp, FTAG); 637 return (err); 638 } 639 640 if (fromsnap != NULL) { 641 zfs_bookmark_phys_t zb; 642 boolean_t is_clone = B_FALSE; 643 int fsnamelen = strchr(tosnap, '@') - tosnap; 644 645 /* 646 * If the fromsnap is in a different filesystem, then 647 * mark the send stream as a clone. 648 */ 649 if (strncmp(tosnap, fromsnap, fsnamelen) != 0 || 650 (fromsnap[fsnamelen] != '@' && 651 fromsnap[fsnamelen] != '#')) { 652 is_clone = B_TRUE; 653 } 654 655 if (strchr(fromsnap, '@')) { 656 dsl_dataset_t *fromds; 657 err = dsl_dataset_hold(dp, fromsnap, FTAG, &fromds); 658 if (err == 0) { 659 if (!dsl_dataset_is_before(ds, fromds, 0)) 660 err = SET_ERROR(EXDEV); 661 zb.zbm_creation_time = 662 fromds->ds_phys->ds_creation_time; 663 zb.zbm_creation_txg = 664 fromds->ds_phys->ds_creation_txg; 665 zb.zbm_guid = fromds->ds_phys->ds_guid; 666 is_clone = (ds->ds_dir != fromds->ds_dir); 667 dsl_dataset_rele(fromds, FTAG); 668 } 669 } else { 670 err = dsl_bookmark_lookup(dp, fromsnap, ds, &zb); 671 } 672 if (err != 0) { 673 dsl_dataset_rele(ds, FTAG); 674 dsl_pool_rele(dp, FTAG); 675 return (err); 676 } 677 err = dmu_send_impl(FTAG, dp, ds, &zb, is_clone, 678 outfd, vp, off); 679 } else { 680 err = dmu_send_impl(FTAG, dp, ds, NULL, B_FALSE, 681 outfd, vp, off); 682 } 683 if (owned) 684 dsl_dataset_disown(ds, FTAG); 685 else 686 dsl_dataset_rele(ds, FTAG); 687 return (err); 688 } 689 690 int 691 dmu_send_estimate(dsl_dataset_t *ds, dsl_dataset_t *fromds, uint64_t *sizep) 692 { 693 dsl_pool_t *dp = ds->ds_dir->dd_pool; 694 int err; 695 uint64_t size; 696 697 ASSERT(dsl_pool_config_held(dp)); 698 699 /* tosnap must be a snapshot */ 700 if (!dsl_dataset_is_snapshot(ds)) 701 return (SET_ERROR(EINVAL)); 702 703 /* 704 * fromsnap must be an earlier snapshot from the same fs as tosnap, 705 * or the origin's fs. 706 */ 707 if (fromds != NULL && !dsl_dataset_is_before(ds, fromds, 0)) 708 return (SET_ERROR(EXDEV)); 709 710 /* Get uncompressed size estimate of changed data. */ 711 if (fromds == NULL) { 712 size = ds->ds_phys->ds_uncompressed_bytes; 713 } else { 714 uint64_t used, comp; 715 err = dsl_dataset_space_written(fromds, ds, 716 &used, &comp, &size); 717 if (err != 0) 718 return (err); 719 } 720 721 /* 722 * Assume that space (both on-disk and in-stream) is dominated by 723 * data. We will adjust for indirect blocks and the copies property, 724 * but ignore per-object space used (eg, dnodes and DRR_OBJECT records). 725 */ 726 727 /* 728 * Subtract out approximate space used by indirect blocks. 729 * Assume most space is used by data blocks (non-indirect, non-dnode). 730 * Assume all blocks are recordsize. Assume ditto blocks and 731 * internal fragmentation counter out compression. 732 * 733 * Therefore, space used by indirect blocks is sizeof(blkptr_t) per 734 * block, which we observe in practice. 735 */ 736 uint64_t recordsize; 737 err = dsl_prop_get_int_ds(ds, "recordsize", &recordsize); 738 if (err != 0) 739 return (err); 740 size -= size / recordsize * sizeof (blkptr_t); 741 742 /* Add in the space for the record associated with each block. */ 743 size += size / recordsize * sizeof (dmu_replay_record_t); 744 745 *sizep = size; 746 747 return (0); 748 } 749 750 typedef struct dmu_recv_begin_arg { 751 const char *drba_origin; 752 dmu_recv_cookie_t *drba_cookie; 753 cred_t *drba_cred; 754 uint64_t drba_snapobj; 755 } dmu_recv_begin_arg_t; 756 757 static int 758 recv_begin_check_existing_impl(dmu_recv_begin_arg_t *drba, dsl_dataset_t *ds, 759 uint64_t fromguid) 760 { 761 uint64_t val; 762 int error; 763 dsl_pool_t *dp = ds->ds_dir->dd_pool; 764 765 /* temporary clone name must not exist */ 766 error = zap_lookup(dp->dp_meta_objset, 767 ds->ds_dir->dd_phys->dd_child_dir_zapobj, recv_clone_name, 768 8, 1, &val); 769 if (error != ENOENT) 770 return (error == 0 ? EBUSY : error); 771 772 /* new snapshot name must not exist */ 773 error = zap_lookup(dp->dp_meta_objset, 774 ds->ds_phys->ds_snapnames_zapobj, drba->drba_cookie->drc_tosnap, 775 8, 1, &val); 776 if (error != ENOENT) 777 return (error == 0 ? EEXIST : error); 778 779 if (fromguid != 0) { 780 dsl_dataset_t *snap; 781 uint64_t obj = ds->ds_phys->ds_prev_snap_obj; 782 783 /* Find snapshot in this dir that matches fromguid. */ 784 while (obj != 0) { 785 error = dsl_dataset_hold_obj(dp, obj, FTAG, 786 &snap); 787 if (error != 0) 788 return (SET_ERROR(ENODEV)); 789 if (snap->ds_dir != ds->ds_dir) { 790 dsl_dataset_rele(snap, FTAG); 791 return (SET_ERROR(ENODEV)); 792 } 793 if (snap->ds_phys->ds_guid == fromguid) 794 break; 795 obj = snap->ds_phys->ds_prev_snap_obj; 796 dsl_dataset_rele(snap, FTAG); 797 } 798 if (obj == 0) 799 return (SET_ERROR(ENODEV)); 800 801 if (drba->drba_cookie->drc_force) { 802 drba->drba_snapobj = obj; 803 } else { 804 /* 805 * If we are not forcing, there must be no 806 * changes since fromsnap. 807 */ 808 if (dsl_dataset_modified_since_snap(ds, snap)) { 809 dsl_dataset_rele(snap, FTAG); 810 return (SET_ERROR(ETXTBSY)); 811 } 812 drba->drba_snapobj = ds->ds_prev->ds_object; 813 } 814 815 dsl_dataset_rele(snap, FTAG); 816 } else { 817 /* if full, most recent snapshot must be $ORIGIN */ 818 if (ds->ds_phys->ds_prev_snap_txg >= TXG_INITIAL) 819 return (SET_ERROR(ENODEV)); 820 drba->drba_snapobj = ds->ds_phys->ds_prev_snap_obj; 821 } 822 823 return (0); 824 825 } 826 827 static int 828 dmu_recv_begin_check(void *arg, dmu_tx_t *tx) 829 { 830 dmu_recv_begin_arg_t *drba = arg; 831 dsl_pool_t *dp = dmu_tx_pool(tx); 832 struct drr_begin *drrb = drba->drba_cookie->drc_drrb; 833 uint64_t fromguid = drrb->drr_fromguid; 834 int flags = drrb->drr_flags; 835 int error; 836 dsl_dataset_t *ds; 837 const char *tofs = drba->drba_cookie->drc_tofs; 838 839 /* already checked */ 840 ASSERT3U(drrb->drr_magic, ==, DMU_BACKUP_MAGIC); 841 842 if (DMU_GET_STREAM_HDRTYPE(drrb->drr_versioninfo) == 843 DMU_COMPOUNDSTREAM || 844 drrb->drr_type >= DMU_OST_NUMTYPES || 845 ((flags & DRR_FLAG_CLONE) && drba->drba_origin == NULL)) 846 return (SET_ERROR(EINVAL)); 847 848 /* Verify pool version supports SA if SA_SPILL feature set */ 849 if ((DMU_GET_FEATUREFLAGS(drrb->drr_versioninfo) & 850 DMU_BACKUP_FEATURE_SA_SPILL) && 851 spa_version(dp->dp_spa) < SPA_VERSION_SA) { 852 return (SET_ERROR(ENOTSUP)); 853 } 854 855 error = dsl_dataset_hold(dp, tofs, FTAG, &ds); 856 if (error == 0) { 857 /* target fs already exists; recv into temp clone */ 858 859 /* Can't recv a clone into an existing fs */ 860 if (flags & DRR_FLAG_CLONE) { 861 dsl_dataset_rele(ds, FTAG); 862 return (SET_ERROR(EINVAL)); 863 } 864 865 error = recv_begin_check_existing_impl(drba, ds, fromguid); 866 dsl_dataset_rele(ds, FTAG); 867 } else if (error == ENOENT) { 868 /* target fs does not exist; must be a full backup or clone */ 869 char buf[MAXNAMELEN]; 870 871 /* 872 * If it's a non-clone incremental, we are missing the 873 * target fs, so fail the recv. 874 */ 875 if (fromguid != 0 && !(flags & DRR_FLAG_CLONE)) 876 return (SET_ERROR(ENOENT)); 877 878 /* Open the parent of tofs */ 879 ASSERT3U(strlen(tofs), <, MAXNAMELEN); 880 (void) strlcpy(buf, tofs, strrchr(tofs, '/') - tofs + 1); 881 error = dsl_dataset_hold(dp, buf, FTAG, &ds); 882 if (error != 0) 883 return (error); 884 885 if (drba->drba_origin != NULL) { 886 dsl_dataset_t *origin; 887 error = dsl_dataset_hold(dp, drba->drba_origin, 888 FTAG, &origin); 889 if (error != 0) { 890 dsl_dataset_rele(ds, FTAG); 891 return (error); 892 } 893 if (!dsl_dataset_is_snapshot(origin)) { 894 dsl_dataset_rele(origin, FTAG); 895 dsl_dataset_rele(ds, FTAG); 896 return (SET_ERROR(EINVAL)); 897 } 898 if (origin->ds_phys->ds_guid != fromguid) { 899 dsl_dataset_rele(origin, FTAG); 900 dsl_dataset_rele(ds, FTAG); 901 return (SET_ERROR(ENODEV)); 902 } 903 dsl_dataset_rele(origin, FTAG); 904 } 905 dsl_dataset_rele(ds, FTAG); 906 error = 0; 907 } 908 return (error); 909 } 910 911 static void 912 dmu_recv_begin_sync(void *arg, dmu_tx_t *tx) 913 { 914 dmu_recv_begin_arg_t *drba = arg; 915 dsl_pool_t *dp = dmu_tx_pool(tx); 916 struct drr_begin *drrb = drba->drba_cookie->drc_drrb; 917 const char *tofs = drba->drba_cookie->drc_tofs; 918 dsl_dataset_t *ds, *newds; 919 uint64_t dsobj; 920 int error; 921 uint64_t crflags; 922 923 crflags = (drrb->drr_flags & DRR_FLAG_CI_DATA) ? 924 DS_FLAG_CI_DATASET : 0; 925 926 error = dsl_dataset_hold(dp, tofs, FTAG, &ds); 927 if (error == 0) { 928 /* create temporary clone */ 929 dsl_dataset_t *snap = NULL; 930 if (drba->drba_snapobj != 0) { 931 VERIFY0(dsl_dataset_hold_obj(dp, 932 drba->drba_snapobj, FTAG, &snap)); 933 } 934 dsobj = dsl_dataset_create_sync(ds->ds_dir, recv_clone_name, 935 snap, crflags, drba->drba_cred, tx); 936 dsl_dataset_rele(snap, FTAG); 937 dsl_dataset_rele(ds, FTAG); 938 } else { 939 dsl_dir_t *dd; 940 const char *tail; 941 dsl_dataset_t *origin = NULL; 942 943 VERIFY0(dsl_dir_hold(dp, tofs, FTAG, &dd, &tail)); 944 945 if (drba->drba_origin != NULL) { 946 VERIFY0(dsl_dataset_hold(dp, drba->drba_origin, 947 FTAG, &origin)); 948 } 949 950 /* Create new dataset. */ 951 dsobj = dsl_dataset_create_sync(dd, 952 strrchr(tofs, '/') + 1, 953 origin, crflags, drba->drba_cred, tx); 954 if (origin != NULL) 955 dsl_dataset_rele(origin, FTAG); 956 dsl_dir_rele(dd, FTAG); 957 drba->drba_cookie->drc_newfs = B_TRUE; 958 } 959 VERIFY0(dsl_dataset_own_obj(dp, dsobj, dmu_recv_tag, &newds)); 960 961 dmu_buf_will_dirty(newds->ds_dbuf, tx); 962 newds->ds_phys->ds_flags |= DS_FLAG_INCONSISTENT; 963 964 /* 965 * If we actually created a non-clone, we need to create the 966 * objset in our new dataset. 967 */ 968 if (BP_IS_HOLE(dsl_dataset_get_blkptr(newds))) { 969 (void) dmu_objset_create_impl(dp->dp_spa, 970 newds, dsl_dataset_get_blkptr(newds), drrb->drr_type, tx); 971 } 972 973 drba->drba_cookie->drc_ds = newds; 974 975 spa_history_log_internal_ds(newds, "receive", tx, ""); 976 } 977 978 /* 979 * NB: callers *MUST* call dmu_recv_stream() if dmu_recv_begin() 980 * succeeds; otherwise we will leak the holds on the datasets. 981 */ 982 int 983 dmu_recv_begin(char *tofs, char *tosnap, struct drr_begin *drrb, 984 boolean_t force, char *origin, dmu_recv_cookie_t *drc) 985 { 986 dmu_recv_begin_arg_t drba = { 0 }; 987 dmu_replay_record_t *drr; 988 989 bzero(drc, sizeof (dmu_recv_cookie_t)); 990 drc->drc_drrb = drrb; 991 drc->drc_tosnap = tosnap; 992 drc->drc_tofs = tofs; 993 drc->drc_force = force; 994 995 if (drrb->drr_magic == BSWAP_64(DMU_BACKUP_MAGIC)) 996 drc->drc_byteswap = B_TRUE; 997 else if (drrb->drr_magic != DMU_BACKUP_MAGIC) 998 return (SET_ERROR(EINVAL)); 999 1000 drr = kmem_zalloc(sizeof (dmu_replay_record_t), KM_SLEEP); 1001 drr->drr_type = DRR_BEGIN; 1002 drr->drr_u.drr_begin = *drc->drc_drrb; 1003 if (drc->drc_byteswap) { 1004 fletcher_4_incremental_byteswap(drr, 1005 sizeof (dmu_replay_record_t), &drc->drc_cksum); 1006 } else { 1007 fletcher_4_incremental_native(drr, 1008 sizeof (dmu_replay_record_t), &drc->drc_cksum); 1009 } 1010 kmem_free(drr, sizeof (dmu_replay_record_t)); 1011 1012 if (drc->drc_byteswap) { 1013 drrb->drr_magic = BSWAP_64(drrb->drr_magic); 1014 drrb->drr_versioninfo = BSWAP_64(drrb->drr_versioninfo); 1015 drrb->drr_creation_time = BSWAP_64(drrb->drr_creation_time); 1016 drrb->drr_type = BSWAP_32(drrb->drr_type); 1017 drrb->drr_toguid = BSWAP_64(drrb->drr_toguid); 1018 drrb->drr_fromguid = BSWAP_64(drrb->drr_fromguid); 1019 } 1020 1021 drba.drba_origin = origin; 1022 drba.drba_cookie = drc; 1023 drba.drba_cred = CRED(); 1024 1025 return (dsl_sync_task(tofs, dmu_recv_begin_check, dmu_recv_begin_sync, 1026 &drba, 5)); 1027 } 1028 1029 struct restorearg { 1030 int err; 1031 boolean_t byteswap; 1032 vnode_t *vp; 1033 char *buf; 1034 uint64_t voff; 1035 int bufsize; /* amount of memory allocated for buf */ 1036 zio_cksum_t cksum; 1037 avl_tree_t *guid_to_ds_map; 1038 }; 1039 1040 typedef struct guid_map_entry { 1041 uint64_t guid; 1042 dsl_dataset_t *gme_ds; 1043 avl_node_t avlnode; 1044 } guid_map_entry_t; 1045 1046 static int 1047 guid_compare(const void *arg1, const void *arg2) 1048 { 1049 const guid_map_entry_t *gmep1 = arg1; 1050 const guid_map_entry_t *gmep2 = arg2; 1051 1052 if (gmep1->guid < gmep2->guid) 1053 return (-1); 1054 else if (gmep1->guid > gmep2->guid) 1055 return (1); 1056 return (0); 1057 } 1058 1059 static void 1060 free_guid_map_onexit(void *arg) 1061 { 1062 avl_tree_t *ca = arg; 1063 void *cookie = NULL; 1064 guid_map_entry_t *gmep; 1065 1066 while ((gmep = avl_destroy_nodes(ca, &cookie)) != NULL) { 1067 dsl_dataset_long_rele(gmep->gme_ds, gmep); 1068 dsl_dataset_rele(gmep->gme_ds, gmep); 1069 kmem_free(gmep, sizeof (guid_map_entry_t)); 1070 } 1071 avl_destroy(ca); 1072 kmem_free(ca, sizeof (avl_tree_t)); 1073 } 1074 1075 static void * 1076 restore_read(struct restorearg *ra, int len) 1077 { 1078 void *rv; 1079 int done = 0; 1080 1081 /* some things will require 8-byte alignment, so everything must */ 1082 ASSERT0(len % 8); 1083 1084 while (done < len) { 1085 ssize_t resid; 1086 1087 ra->err = vn_rdwr(UIO_READ, ra->vp, 1088 (caddr_t)ra->buf + done, len - done, 1089 ra->voff, UIO_SYSSPACE, FAPPEND, 1090 RLIM64_INFINITY, CRED(), &resid); 1091 1092 if (resid == len - done) 1093 ra->err = SET_ERROR(EINVAL); 1094 ra->voff += len - done - resid; 1095 done = len - resid; 1096 if (ra->err != 0) 1097 return (NULL); 1098 } 1099 1100 ASSERT3U(done, ==, len); 1101 rv = ra->buf; 1102 if (ra->byteswap) 1103 fletcher_4_incremental_byteswap(rv, len, &ra->cksum); 1104 else 1105 fletcher_4_incremental_native(rv, len, &ra->cksum); 1106 return (rv); 1107 } 1108 1109 static void 1110 backup_byteswap(dmu_replay_record_t *drr) 1111 { 1112 #define DO64(X) (drr->drr_u.X = BSWAP_64(drr->drr_u.X)) 1113 #define DO32(X) (drr->drr_u.X = BSWAP_32(drr->drr_u.X)) 1114 drr->drr_type = BSWAP_32(drr->drr_type); 1115 drr->drr_payloadlen = BSWAP_32(drr->drr_payloadlen); 1116 switch (drr->drr_type) { 1117 case DRR_BEGIN: 1118 DO64(drr_begin.drr_magic); 1119 DO64(drr_begin.drr_versioninfo); 1120 DO64(drr_begin.drr_creation_time); 1121 DO32(drr_begin.drr_type); 1122 DO32(drr_begin.drr_flags); 1123 DO64(drr_begin.drr_toguid); 1124 DO64(drr_begin.drr_fromguid); 1125 break; 1126 case DRR_OBJECT: 1127 DO64(drr_object.drr_object); 1128 /* DO64(drr_object.drr_allocation_txg); */ 1129 DO32(drr_object.drr_type); 1130 DO32(drr_object.drr_bonustype); 1131 DO32(drr_object.drr_blksz); 1132 DO32(drr_object.drr_bonuslen); 1133 DO64(drr_object.drr_toguid); 1134 break; 1135 case DRR_FREEOBJECTS: 1136 DO64(drr_freeobjects.drr_firstobj); 1137 DO64(drr_freeobjects.drr_numobjs); 1138 DO64(drr_freeobjects.drr_toguid); 1139 break; 1140 case DRR_WRITE: 1141 DO64(drr_write.drr_object); 1142 DO32(drr_write.drr_type); 1143 DO64(drr_write.drr_offset); 1144 DO64(drr_write.drr_length); 1145 DO64(drr_write.drr_toguid); 1146 DO64(drr_write.drr_key.ddk_cksum.zc_word[0]); 1147 DO64(drr_write.drr_key.ddk_cksum.zc_word[1]); 1148 DO64(drr_write.drr_key.ddk_cksum.zc_word[2]); 1149 DO64(drr_write.drr_key.ddk_cksum.zc_word[3]); 1150 DO64(drr_write.drr_key.ddk_prop); 1151 break; 1152 case DRR_WRITE_BYREF: 1153 DO64(drr_write_byref.drr_object); 1154 DO64(drr_write_byref.drr_offset); 1155 DO64(drr_write_byref.drr_length); 1156 DO64(drr_write_byref.drr_toguid); 1157 DO64(drr_write_byref.drr_refguid); 1158 DO64(drr_write_byref.drr_refobject); 1159 DO64(drr_write_byref.drr_refoffset); 1160 DO64(drr_write_byref.drr_key.ddk_cksum.zc_word[0]); 1161 DO64(drr_write_byref.drr_key.ddk_cksum.zc_word[1]); 1162 DO64(drr_write_byref.drr_key.ddk_cksum.zc_word[2]); 1163 DO64(drr_write_byref.drr_key.ddk_cksum.zc_word[3]); 1164 DO64(drr_write_byref.drr_key.ddk_prop); 1165 break; 1166 case DRR_FREE: 1167 DO64(drr_free.drr_object); 1168 DO64(drr_free.drr_offset); 1169 DO64(drr_free.drr_length); 1170 DO64(drr_free.drr_toguid); 1171 break; 1172 case DRR_SPILL: 1173 DO64(drr_spill.drr_object); 1174 DO64(drr_spill.drr_length); 1175 DO64(drr_spill.drr_toguid); 1176 break; 1177 case DRR_END: 1178 DO64(drr_end.drr_checksum.zc_word[0]); 1179 DO64(drr_end.drr_checksum.zc_word[1]); 1180 DO64(drr_end.drr_checksum.zc_word[2]); 1181 DO64(drr_end.drr_checksum.zc_word[3]); 1182 DO64(drr_end.drr_toguid); 1183 break; 1184 } 1185 #undef DO64 1186 #undef DO32 1187 } 1188 1189 static int 1190 restore_object(struct restorearg *ra, objset_t *os, struct drr_object *drro) 1191 { 1192 int err; 1193 dmu_tx_t *tx; 1194 void *data = NULL; 1195 1196 if (drro->drr_type == DMU_OT_NONE || 1197 !DMU_OT_IS_VALID(drro->drr_type) || 1198 !DMU_OT_IS_VALID(drro->drr_bonustype) || 1199 drro->drr_checksumtype >= ZIO_CHECKSUM_FUNCTIONS || 1200 drro->drr_compress >= ZIO_COMPRESS_FUNCTIONS || 1201 P2PHASE(drro->drr_blksz, SPA_MINBLOCKSIZE) || 1202 drro->drr_blksz < SPA_MINBLOCKSIZE || 1203 drro->drr_blksz > SPA_MAXBLOCKSIZE || 1204 drro->drr_bonuslen > DN_MAX_BONUSLEN) { 1205 return (SET_ERROR(EINVAL)); 1206 } 1207 1208 err = dmu_object_info(os, drro->drr_object, NULL); 1209 1210 if (err != 0 && err != ENOENT) 1211 return (SET_ERROR(EINVAL)); 1212 1213 if (drro->drr_bonuslen) { 1214 data = restore_read(ra, P2ROUNDUP(drro->drr_bonuslen, 8)); 1215 if (ra->err != 0) 1216 return (ra->err); 1217 } 1218 1219 if (err == ENOENT) { 1220 /* currently free, want to be allocated */ 1221 tx = dmu_tx_create(os); 1222 dmu_tx_hold_bonus(tx, DMU_NEW_OBJECT); 1223 err = dmu_tx_assign(tx, TXG_WAIT); 1224 if (err != 0) { 1225 dmu_tx_abort(tx); 1226 return (err); 1227 } 1228 err = dmu_object_claim(os, drro->drr_object, 1229 drro->drr_type, drro->drr_blksz, 1230 drro->drr_bonustype, drro->drr_bonuslen, tx); 1231 dmu_tx_commit(tx); 1232 } else { 1233 /* currently allocated, want to be allocated */ 1234 err = dmu_object_reclaim(os, drro->drr_object, 1235 drro->drr_type, drro->drr_blksz, 1236 drro->drr_bonustype, drro->drr_bonuslen); 1237 } 1238 if (err != 0) { 1239 return (SET_ERROR(EINVAL)); 1240 } 1241 1242 tx = dmu_tx_create(os); 1243 dmu_tx_hold_bonus(tx, drro->drr_object); 1244 err = dmu_tx_assign(tx, TXG_WAIT); 1245 if (err != 0) { 1246 dmu_tx_abort(tx); 1247 return (err); 1248 } 1249 1250 dmu_object_set_checksum(os, drro->drr_object, drro->drr_checksumtype, 1251 tx); 1252 dmu_object_set_compress(os, drro->drr_object, drro->drr_compress, tx); 1253 1254 if (data != NULL) { 1255 dmu_buf_t *db; 1256 1257 VERIFY(0 == dmu_bonus_hold(os, drro->drr_object, FTAG, &db)); 1258 dmu_buf_will_dirty(db, tx); 1259 1260 ASSERT3U(db->db_size, >=, drro->drr_bonuslen); 1261 bcopy(data, db->db_data, drro->drr_bonuslen); 1262 if (ra->byteswap) { 1263 dmu_object_byteswap_t byteswap = 1264 DMU_OT_BYTESWAP(drro->drr_bonustype); 1265 dmu_ot_byteswap[byteswap].ob_func(db->db_data, 1266 drro->drr_bonuslen); 1267 } 1268 dmu_buf_rele(db, FTAG); 1269 } 1270 dmu_tx_commit(tx); 1271 return (0); 1272 } 1273 1274 /* ARGSUSED */ 1275 static int 1276 restore_freeobjects(struct restorearg *ra, objset_t *os, 1277 struct drr_freeobjects *drrfo) 1278 { 1279 uint64_t obj; 1280 1281 if (drrfo->drr_firstobj + drrfo->drr_numobjs < drrfo->drr_firstobj) 1282 return (SET_ERROR(EINVAL)); 1283 1284 for (obj = drrfo->drr_firstobj; 1285 obj < drrfo->drr_firstobj + drrfo->drr_numobjs; 1286 (void) dmu_object_next(os, &obj, FALSE, 0)) { 1287 int err; 1288 1289 if (dmu_object_info(os, obj, NULL) != 0) 1290 continue; 1291 1292 err = dmu_free_long_object(os, obj); 1293 if (err != 0) 1294 return (err); 1295 } 1296 return (0); 1297 } 1298 1299 static int 1300 restore_write(struct restorearg *ra, objset_t *os, 1301 struct drr_write *drrw) 1302 { 1303 dmu_tx_t *tx; 1304 void *data; 1305 int err; 1306 1307 if (drrw->drr_offset + drrw->drr_length < drrw->drr_offset || 1308 !DMU_OT_IS_VALID(drrw->drr_type)) 1309 return (SET_ERROR(EINVAL)); 1310 1311 data = restore_read(ra, drrw->drr_length); 1312 if (data == NULL) 1313 return (ra->err); 1314 1315 if (dmu_object_info(os, drrw->drr_object, NULL) != 0) 1316 return (SET_ERROR(EINVAL)); 1317 1318 tx = dmu_tx_create(os); 1319 1320 dmu_tx_hold_write(tx, drrw->drr_object, 1321 drrw->drr_offset, drrw->drr_length); 1322 err = dmu_tx_assign(tx, TXG_WAIT); 1323 if (err != 0) { 1324 dmu_tx_abort(tx); 1325 return (err); 1326 } 1327 if (ra->byteswap) { 1328 dmu_object_byteswap_t byteswap = 1329 DMU_OT_BYTESWAP(drrw->drr_type); 1330 dmu_ot_byteswap[byteswap].ob_func(data, drrw->drr_length); 1331 } 1332 dmu_write(os, drrw->drr_object, 1333 drrw->drr_offset, drrw->drr_length, data, tx); 1334 dmu_tx_commit(tx); 1335 return (0); 1336 } 1337 1338 /* 1339 * Handle a DRR_WRITE_BYREF record. This record is used in dedup'ed 1340 * streams to refer to a copy of the data that is already on the 1341 * system because it came in earlier in the stream. This function 1342 * finds the earlier copy of the data, and uses that copy instead of 1343 * data from the stream to fulfill this write. 1344 */ 1345 static int 1346 restore_write_byref(struct restorearg *ra, objset_t *os, 1347 struct drr_write_byref *drrwbr) 1348 { 1349 dmu_tx_t *tx; 1350 int err; 1351 guid_map_entry_t gmesrch; 1352 guid_map_entry_t *gmep; 1353 avl_index_t where; 1354 objset_t *ref_os = NULL; 1355 dmu_buf_t *dbp; 1356 1357 if (drrwbr->drr_offset + drrwbr->drr_length < drrwbr->drr_offset) 1358 return (SET_ERROR(EINVAL)); 1359 1360 /* 1361 * If the GUID of the referenced dataset is different from the 1362 * GUID of the target dataset, find the referenced dataset. 1363 */ 1364 if (drrwbr->drr_toguid != drrwbr->drr_refguid) { 1365 gmesrch.guid = drrwbr->drr_refguid; 1366 if ((gmep = avl_find(ra->guid_to_ds_map, &gmesrch, 1367 &where)) == NULL) { 1368 return (SET_ERROR(EINVAL)); 1369 } 1370 if (dmu_objset_from_ds(gmep->gme_ds, &ref_os)) 1371 return (SET_ERROR(EINVAL)); 1372 } else { 1373 ref_os = os; 1374 } 1375 1376 if (err = dmu_buf_hold(ref_os, drrwbr->drr_refobject, 1377 drrwbr->drr_refoffset, FTAG, &dbp, DMU_READ_PREFETCH)) 1378 return (err); 1379 1380 tx = dmu_tx_create(os); 1381 1382 dmu_tx_hold_write(tx, drrwbr->drr_object, 1383 drrwbr->drr_offset, drrwbr->drr_length); 1384 err = dmu_tx_assign(tx, TXG_WAIT); 1385 if (err != 0) { 1386 dmu_tx_abort(tx); 1387 return (err); 1388 } 1389 dmu_write(os, drrwbr->drr_object, 1390 drrwbr->drr_offset, drrwbr->drr_length, dbp->db_data, tx); 1391 dmu_buf_rele(dbp, FTAG); 1392 dmu_tx_commit(tx); 1393 return (0); 1394 } 1395 1396 static int 1397 restore_spill(struct restorearg *ra, objset_t *os, struct drr_spill *drrs) 1398 { 1399 dmu_tx_t *tx; 1400 void *data; 1401 dmu_buf_t *db, *db_spill; 1402 int err; 1403 1404 if (drrs->drr_length < SPA_MINBLOCKSIZE || 1405 drrs->drr_length > SPA_MAXBLOCKSIZE) 1406 return (SET_ERROR(EINVAL)); 1407 1408 data = restore_read(ra, drrs->drr_length); 1409 if (data == NULL) 1410 return (ra->err); 1411 1412 if (dmu_object_info(os, drrs->drr_object, NULL) != 0) 1413 return (SET_ERROR(EINVAL)); 1414 1415 VERIFY(0 == dmu_bonus_hold(os, drrs->drr_object, FTAG, &db)); 1416 if ((err = dmu_spill_hold_by_bonus(db, FTAG, &db_spill)) != 0) { 1417 dmu_buf_rele(db, FTAG); 1418 return (err); 1419 } 1420 1421 tx = dmu_tx_create(os); 1422 1423 dmu_tx_hold_spill(tx, db->db_object); 1424 1425 err = dmu_tx_assign(tx, TXG_WAIT); 1426 if (err != 0) { 1427 dmu_buf_rele(db, FTAG); 1428 dmu_buf_rele(db_spill, FTAG); 1429 dmu_tx_abort(tx); 1430 return (err); 1431 } 1432 dmu_buf_will_dirty(db_spill, tx); 1433 1434 if (db_spill->db_size < drrs->drr_length) 1435 VERIFY(0 == dbuf_spill_set_blksz(db_spill, 1436 drrs->drr_length, tx)); 1437 bcopy(data, db_spill->db_data, drrs->drr_length); 1438 1439 dmu_buf_rele(db, FTAG); 1440 dmu_buf_rele(db_spill, FTAG); 1441 1442 dmu_tx_commit(tx); 1443 return (0); 1444 } 1445 1446 /* ARGSUSED */ 1447 static int 1448 restore_free(struct restorearg *ra, objset_t *os, 1449 struct drr_free *drrf) 1450 { 1451 int err; 1452 1453 if (drrf->drr_length != -1ULL && 1454 drrf->drr_offset + drrf->drr_length < drrf->drr_offset) 1455 return (SET_ERROR(EINVAL)); 1456 1457 if (dmu_object_info(os, drrf->drr_object, NULL) != 0) 1458 return (SET_ERROR(EINVAL)); 1459 1460 err = dmu_free_long_range(os, drrf->drr_object, 1461 drrf->drr_offset, drrf->drr_length); 1462 return (err); 1463 } 1464 1465 /* used to destroy the drc_ds on error */ 1466 static void 1467 dmu_recv_cleanup_ds(dmu_recv_cookie_t *drc) 1468 { 1469 char name[MAXNAMELEN]; 1470 dsl_dataset_name(drc->drc_ds, name); 1471 dsl_dataset_disown(drc->drc_ds, dmu_recv_tag); 1472 (void) dsl_destroy_head(name); 1473 } 1474 1475 /* 1476 * NB: callers *must* call dmu_recv_end() if this succeeds. 1477 */ 1478 int 1479 dmu_recv_stream(dmu_recv_cookie_t *drc, vnode_t *vp, offset_t *voffp, 1480 int cleanup_fd, uint64_t *action_handlep) 1481 { 1482 struct restorearg ra = { 0 }; 1483 dmu_replay_record_t *drr; 1484 objset_t *os; 1485 zio_cksum_t pcksum; 1486 int featureflags; 1487 1488 ra.byteswap = drc->drc_byteswap; 1489 ra.cksum = drc->drc_cksum; 1490 ra.vp = vp; 1491 ra.voff = *voffp; 1492 ra.bufsize = 1<<20; 1493 ra.buf = kmem_alloc(ra.bufsize, KM_SLEEP); 1494 1495 /* these were verified in dmu_recv_begin */ 1496 ASSERT3U(DMU_GET_STREAM_HDRTYPE(drc->drc_drrb->drr_versioninfo), ==, 1497 DMU_SUBSTREAM); 1498 ASSERT3U(drc->drc_drrb->drr_type, <, DMU_OST_NUMTYPES); 1499 1500 /* 1501 * Open the objset we are modifying. 1502 */ 1503 VERIFY0(dmu_objset_from_ds(drc->drc_ds, &os)); 1504 1505 ASSERT(drc->drc_ds->ds_phys->ds_flags & DS_FLAG_INCONSISTENT); 1506 1507 featureflags = DMU_GET_FEATUREFLAGS(drc->drc_drrb->drr_versioninfo); 1508 1509 /* if this stream is dedup'ed, set up the avl tree for guid mapping */ 1510 if (featureflags & DMU_BACKUP_FEATURE_DEDUP) { 1511 minor_t minor; 1512 1513 if (cleanup_fd == -1) { 1514 ra.err = SET_ERROR(EBADF); 1515 goto out; 1516 } 1517 ra.err = zfs_onexit_fd_hold(cleanup_fd, &minor); 1518 if (ra.err != 0) { 1519 cleanup_fd = -1; 1520 goto out; 1521 } 1522 1523 if (*action_handlep == 0) { 1524 ra.guid_to_ds_map = 1525 kmem_alloc(sizeof (avl_tree_t), KM_SLEEP); 1526 avl_create(ra.guid_to_ds_map, guid_compare, 1527 sizeof (guid_map_entry_t), 1528 offsetof(guid_map_entry_t, avlnode)); 1529 ra.err = zfs_onexit_add_cb(minor, 1530 free_guid_map_onexit, ra.guid_to_ds_map, 1531 action_handlep); 1532 if (ra.err != 0) 1533 goto out; 1534 } else { 1535 ra.err = zfs_onexit_cb_data(minor, *action_handlep, 1536 (void **)&ra.guid_to_ds_map); 1537 if (ra.err != 0) 1538 goto out; 1539 } 1540 1541 drc->drc_guid_to_ds_map = ra.guid_to_ds_map; 1542 } 1543 1544 /* 1545 * Read records and process them. 1546 */ 1547 pcksum = ra.cksum; 1548 while (ra.err == 0 && 1549 NULL != (drr = restore_read(&ra, sizeof (*drr)))) { 1550 if (issig(JUSTLOOKING) && issig(FORREAL)) { 1551 ra.err = SET_ERROR(EINTR); 1552 goto out; 1553 } 1554 1555 if (ra.byteswap) 1556 backup_byteswap(drr); 1557 1558 switch (drr->drr_type) { 1559 case DRR_OBJECT: 1560 { 1561 /* 1562 * We need to make a copy of the record header, 1563 * because restore_{object,write} may need to 1564 * restore_read(), which will invalidate drr. 1565 */ 1566 struct drr_object drro = drr->drr_u.drr_object; 1567 ra.err = restore_object(&ra, os, &drro); 1568 break; 1569 } 1570 case DRR_FREEOBJECTS: 1571 { 1572 struct drr_freeobjects drrfo = 1573 drr->drr_u.drr_freeobjects; 1574 ra.err = restore_freeobjects(&ra, os, &drrfo); 1575 break; 1576 } 1577 case DRR_WRITE: 1578 { 1579 struct drr_write drrw = drr->drr_u.drr_write; 1580 ra.err = restore_write(&ra, os, &drrw); 1581 break; 1582 } 1583 case DRR_WRITE_BYREF: 1584 { 1585 struct drr_write_byref drrwbr = 1586 drr->drr_u.drr_write_byref; 1587 ra.err = restore_write_byref(&ra, os, &drrwbr); 1588 break; 1589 } 1590 case DRR_FREE: 1591 { 1592 struct drr_free drrf = drr->drr_u.drr_free; 1593 ra.err = restore_free(&ra, os, &drrf); 1594 break; 1595 } 1596 case DRR_END: 1597 { 1598 struct drr_end drre = drr->drr_u.drr_end; 1599 /* 1600 * We compare against the *previous* checksum 1601 * value, because the stored checksum is of 1602 * everything before the DRR_END record. 1603 */ 1604 if (!ZIO_CHECKSUM_EQUAL(drre.drr_checksum, pcksum)) 1605 ra.err = SET_ERROR(ECKSUM); 1606 goto out; 1607 } 1608 case DRR_SPILL: 1609 { 1610 struct drr_spill drrs = drr->drr_u.drr_spill; 1611 ra.err = restore_spill(&ra, os, &drrs); 1612 break; 1613 } 1614 default: 1615 ra.err = SET_ERROR(EINVAL); 1616 goto out; 1617 } 1618 pcksum = ra.cksum; 1619 } 1620 ASSERT(ra.err != 0); 1621 1622 out: 1623 if ((featureflags & DMU_BACKUP_FEATURE_DEDUP) && (cleanup_fd != -1)) 1624 zfs_onexit_fd_rele(cleanup_fd); 1625 1626 if (ra.err != 0) { 1627 /* 1628 * destroy what we created, so we don't leave it in the 1629 * inconsistent restoring state. 1630 */ 1631 dmu_recv_cleanup_ds(drc); 1632 } 1633 1634 kmem_free(ra.buf, ra.bufsize); 1635 *voffp = ra.voff; 1636 return (ra.err); 1637 } 1638 1639 static int 1640 dmu_recv_end_check(void *arg, dmu_tx_t *tx) 1641 { 1642 dmu_recv_cookie_t *drc = arg; 1643 dsl_pool_t *dp = dmu_tx_pool(tx); 1644 int error; 1645 1646 ASSERT3P(drc->drc_ds->ds_owner, ==, dmu_recv_tag); 1647 1648 if (!drc->drc_newfs) { 1649 dsl_dataset_t *origin_head; 1650 1651 error = dsl_dataset_hold(dp, drc->drc_tofs, FTAG, &origin_head); 1652 if (error != 0) 1653 return (error); 1654 if (drc->drc_force) { 1655 /* 1656 * We will destroy any snapshots in tofs (i.e. before 1657 * origin_head) that are after the origin (which is 1658 * the snap before drc_ds, because drc_ds can not 1659 * have any snaps of its own). 1660 */ 1661 uint64_t obj = origin_head->ds_phys->ds_prev_snap_obj; 1662 while (obj != drc->drc_ds->ds_phys->ds_prev_snap_obj) { 1663 dsl_dataset_t *snap; 1664 error = dsl_dataset_hold_obj(dp, obj, FTAG, 1665 &snap); 1666 if (error != 0) 1667 return (error); 1668 if (snap->ds_dir != origin_head->ds_dir) 1669 error = SET_ERROR(EINVAL); 1670 if (error == 0) { 1671 error = dsl_destroy_snapshot_check_impl( 1672 snap, B_FALSE); 1673 } 1674 obj = snap->ds_phys->ds_prev_snap_obj; 1675 dsl_dataset_rele(snap, FTAG); 1676 if (error != 0) 1677 return (error); 1678 } 1679 } 1680 error = dsl_dataset_clone_swap_check_impl(drc->drc_ds, 1681 origin_head, drc->drc_force, drc->drc_owner, tx); 1682 if (error != 0) { 1683 dsl_dataset_rele(origin_head, FTAG); 1684 return (error); 1685 } 1686 error = dsl_dataset_snapshot_check_impl(origin_head, 1687 drc->drc_tosnap, tx, B_TRUE); 1688 dsl_dataset_rele(origin_head, FTAG); 1689 if (error != 0) 1690 return (error); 1691 1692 error = dsl_destroy_head_check_impl(drc->drc_ds, 1); 1693 } else { 1694 error = dsl_dataset_snapshot_check_impl(drc->drc_ds, 1695 drc->drc_tosnap, tx, B_TRUE); 1696 } 1697 return (error); 1698 } 1699 1700 static void 1701 dmu_recv_end_sync(void *arg, dmu_tx_t *tx) 1702 { 1703 dmu_recv_cookie_t *drc = arg; 1704 dsl_pool_t *dp = dmu_tx_pool(tx); 1705 1706 spa_history_log_internal_ds(drc->drc_ds, "finish receiving", 1707 tx, "snap=%s", drc->drc_tosnap); 1708 1709 if (!drc->drc_newfs) { 1710 dsl_dataset_t *origin_head; 1711 1712 VERIFY0(dsl_dataset_hold(dp, drc->drc_tofs, FTAG, 1713 &origin_head)); 1714 1715 if (drc->drc_force) { 1716 /* 1717 * Destroy any snapshots of drc_tofs (origin_head) 1718 * after the origin (the snap before drc_ds). 1719 */ 1720 uint64_t obj = origin_head->ds_phys->ds_prev_snap_obj; 1721 while (obj != drc->drc_ds->ds_phys->ds_prev_snap_obj) { 1722 dsl_dataset_t *snap; 1723 VERIFY0(dsl_dataset_hold_obj(dp, obj, FTAG, 1724 &snap)); 1725 ASSERT3P(snap->ds_dir, ==, origin_head->ds_dir); 1726 obj = snap->ds_phys->ds_prev_snap_obj; 1727 dsl_destroy_snapshot_sync_impl(snap, 1728 B_FALSE, tx); 1729 dsl_dataset_rele(snap, FTAG); 1730 } 1731 } 1732 VERIFY3P(drc->drc_ds->ds_prev, ==, 1733 origin_head->ds_prev); 1734 1735 dsl_dataset_clone_swap_sync_impl(drc->drc_ds, 1736 origin_head, tx); 1737 dsl_dataset_snapshot_sync_impl(origin_head, 1738 drc->drc_tosnap, tx); 1739 1740 /* set snapshot's creation time and guid */ 1741 dmu_buf_will_dirty(origin_head->ds_prev->ds_dbuf, tx); 1742 origin_head->ds_prev->ds_phys->ds_creation_time = 1743 drc->drc_drrb->drr_creation_time; 1744 origin_head->ds_prev->ds_phys->ds_guid = 1745 drc->drc_drrb->drr_toguid; 1746 origin_head->ds_prev->ds_phys->ds_flags &= 1747 ~DS_FLAG_INCONSISTENT; 1748 1749 dmu_buf_will_dirty(origin_head->ds_dbuf, tx); 1750 origin_head->ds_phys->ds_flags &= ~DS_FLAG_INCONSISTENT; 1751 1752 dsl_dataset_rele(origin_head, FTAG); 1753 dsl_destroy_head_sync_impl(drc->drc_ds, tx); 1754 1755 if (drc->drc_owner != NULL) 1756 VERIFY3P(origin_head->ds_owner, ==, drc->drc_owner); 1757 } else { 1758 dsl_dataset_t *ds = drc->drc_ds; 1759 1760 dsl_dataset_snapshot_sync_impl(ds, drc->drc_tosnap, tx); 1761 1762 /* set snapshot's creation time and guid */ 1763 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 1764 ds->ds_prev->ds_phys->ds_creation_time = 1765 drc->drc_drrb->drr_creation_time; 1766 ds->ds_prev->ds_phys->ds_guid = drc->drc_drrb->drr_toguid; 1767 ds->ds_prev->ds_phys->ds_flags &= ~DS_FLAG_INCONSISTENT; 1768 1769 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1770 ds->ds_phys->ds_flags &= ~DS_FLAG_INCONSISTENT; 1771 } 1772 drc->drc_newsnapobj = drc->drc_ds->ds_phys->ds_prev_snap_obj; 1773 /* 1774 * Release the hold from dmu_recv_begin. This must be done before 1775 * we return to open context, so that when we free the dataset's dnode, 1776 * we can evict its bonus buffer. 1777 */ 1778 dsl_dataset_disown(drc->drc_ds, dmu_recv_tag); 1779 drc->drc_ds = NULL; 1780 } 1781 1782 static int 1783 add_ds_to_guidmap(const char *name, avl_tree_t *guid_map, uint64_t snapobj) 1784 { 1785 dsl_pool_t *dp; 1786 dsl_dataset_t *snapds; 1787 guid_map_entry_t *gmep; 1788 int err; 1789 1790 ASSERT(guid_map != NULL); 1791 1792 err = dsl_pool_hold(name, FTAG, &dp); 1793 if (err != 0) 1794 return (err); 1795 gmep = kmem_alloc(sizeof (*gmep), KM_SLEEP); 1796 err = dsl_dataset_hold_obj(dp, snapobj, gmep, &snapds); 1797 if (err == 0) { 1798 gmep->guid = snapds->ds_phys->ds_guid; 1799 gmep->gme_ds = snapds; 1800 avl_add(guid_map, gmep); 1801 dsl_dataset_long_hold(snapds, gmep); 1802 } else { 1803 kmem_free(gmep, sizeof (*gmep)); 1804 } 1805 1806 dsl_pool_rele(dp, FTAG); 1807 return (err); 1808 } 1809 1810 static int dmu_recv_end_modified_blocks = 3; 1811 1812 static int 1813 dmu_recv_existing_end(dmu_recv_cookie_t *drc) 1814 { 1815 int error; 1816 char name[MAXNAMELEN]; 1817 1818 #ifdef _KERNEL 1819 /* 1820 * We will be destroying the ds; make sure its origin is unmounted if 1821 * necessary. 1822 */ 1823 dsl_dataset_name(drc->drc_ds, name); 1824 zfs_destroy_unmount_origin(name); 1825 #endif 1826 1827 error = dsl_sync_task(drc->drc_tofs, 1828 dmu_recv_end_check, dmu_recv_end_sync, drc, 1829 dmu_recv_end_modified_blocks); 1830 1831 if (error != 0) 1832 dmu_recv_cleanup_ds(drc); 1833 return (error); 1834 } 1835 1836 static int 1837 dmu_recv_new_end(dmu_recv_cookie_t *drc) 1838 { 1839 int error; 1840 1841 error = dsl_sync_task(drc->drc_tofs, 1842 dmu_recv_end_check, dmu_recv_end_sync, drc, 1843 dmu_recv_end_modified_blocks); 1844 1845 if (error != 0) { 1846 dmu_recv_cleanup_ds(drc); 1847 } else if (drc->drc_guid_to_ds_map != NULL) { 1848 (void) add_ds_to_guidmap(drc->drc_tofs, 1849 drc->drc_guid_to_ds_map, 1850 drc->drc_newsnapobj); 1851 } 1852 return (error); 1853 } 1854 1855 int 1856 dmu_recv_end(dmu_recv_cookie_t *drc, void *owner) 1857 { 1858 drc->drc_owner = owner; 1859 1860 if (drc->drc_newfs) 1861 return (dmu_recv_new_end(drc)); 1862 else 1863 return (dmu_recv_existing_end(drc)); 1864 } 1865 1866 /* 1867 * Return TRUE if this objset is currently being received into. 1868 */ 1869 boolean_t 1870 dmu_objset_is_receiving(objset_t *os) 1871 { 1872 return (os->os_dsl_dataset != NULL && 1873 os->os_dsl_dataset->ds_owner == dmu_recv_tag); 1874 } 1875