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 /* 23 * Copyright (c) 2012, 2014 by Delphix. All rights reserved. 24 * Copyright (c) 2013 Steven Hartland. All rights reserved. 25 * Copyright 2015 RackTop Systems. 26 */ 27 28 /* 29 * LibZFS_Core (lzc) is intended to replace most functionality in libzfs. 30 * It has the following characteristics: 31 * 32 * - Thread Safe. libzfs_core is accessible concurrently from multiple 33 * threads. This is accomplished primarily by avoiding global data 34 * (e.g. caching). Since it's thread-safe, there is no reason for a 35 * process to have multiple libzfs "instances". Therefore, we store 36 * our few pieces of data (e.g. the file descriptor) in global 37 * variables. The fd is reference-counted so that the libzfs_core 38 * library can be "initialized" multiple times (e.g. by different 39 * consumers within the same process). 40 * 41 * - Committed Interface. The libzfs_core interface will be committed, 42 * therefore consumers can compile against it and be confident that 43 * their code will continue to work on future releases of this code. 44 * Currently, the interface is Evolving (not Committed), but we intend 45 * to commit to it once it is more complete and we determine that it 46 * meets the needs of all consumers. 47 * 48 * - Programatic Error Handling. libzfs_core communicates errors with 49 * defined error numbers, and doesn't print anything to stdout/stderr. 50 * 51 * - Thin Layer. libzfs_core is a thin layer, marshaling arguments 52 * to/from the kernel ioctls. There is generally a 1:1 correspondence 53 * between libzfs_core functions and ioctls to /dev/zfs. 54 * 55 * - Clear Atomicity. Because libzfs_core functions are generally 1:1 56 * with kernel ioctls, and kernel ioctls are general atomic, each 57 * libzfs_core function is atomic. For example, creating multiple 58 * snapshots with a single call to lzc_snapshot() is atomic -- it 59 * can't fail with only some of the requested snapshots created, even 60 * in the event of power loss or system crash. 61 * 62 * - Continued libzfs Support. Some higher-level operations (e.g. 63 * support for "zfs send -R") are too complicated to fit the scope of 64 * libzfs_core. This functionality will continue to live in libzfs. 65 * Where appropriate, libzfs will use the underlying atomic operations 66 * of libzfs_core. For example, libzfs may implement "zfs send -R | 67 * zfs receive" by using individual "send one snapshot", rename, 68 * destroy, and "receive one snapshot" operations in libzfs_core. 69 * /sbin/zfs and /zbin/zpool will link with both libzfs and 70 * libzfs_core. Other consumers should aim to use only libzfs_core, 71 * since that will be the supported, stable interface going forwards. 72 */ 73 74 #include <libzfs_core.h> 75 #include <ctype.h> 76 #include <unistd.h> 77 #include <stdlib.h> 78 #include <string.h> 79 #include <errno.h> 80 #include <fcntl.h> 81 #include <pthread.h> 82 #include <sys/nvpair.h> 83 #include <sys/param.h> 84 #include <sys/types.h> 85 #include <sys/stat.h> 86 #include <sys/zfs_ioctl.h> 87 88 static int g_fd; 89 static pthread_mutex_t g_lock = PTHREAD_MUTEX_INITIALIZER; 90 static int g_refcount; 91 92 int 93 libzfs_core_init(void) 94 { 95 (void) pthread_mutex_lock(&g_lock); 96 if (g_refcount == 0) { 97 g_fd = open("/dev/zfs", O_RDWR); 98 if (g_fd < 0) { 99 (void) pthread_mutex_unlock(&g_lock); 100 return (errno); 101 } 102 } 103 g_refcount++; 104 (void) pthread_mutex_unlock(&g_lock); 105 return (0); 106 } 107 108 void 109 libzfs_core_fini(void) 110 { 111 (void) pthread_mutex_lock(&g_lock); 112 ASSERT3S(g_refcount, >, 0); 113 g_refcount--; 114 if (g_refcount == 0) 115 (void) close(g_fd); 116 (void) pthread_mutex_unlock(&g_lock); 117 } 118 119 static int 120 lzc_ioctl(zfs_ioc_t ioc, const char *name, 121 nvlist_t *source, nvlist_t **resultp) 122 { 123 zfs_cmd_t zc = { 0 }; 124 int error = 0; 125 char *packed; 126 size_t size; 127 128 ASSERT3S(g_refcount, >, 0); 129 130 (void) strlcpy(zc.zc_name, name, sizeof (zc.zc_name)); 131 132 packed = fnvlist_pack(source, &size); 133 zc.zc_nvlist_src = (uint64_t)(uintptr_t)packed; 134 zc.zc_nvlist_src_size = size; 135 136 if (resultp != NULL) { 137 *resultp = NULL; 138 zc.zc_nvlist_dst_size = MAX(size * 2, 128 * 1024); 139 zc.zc_nvlist_dst = (uint64_t)(uintptr_t) 140 malloc(zc.zc_nvlist_dst_size); 141 if (zc.zc_nvlist_dst == NULL) { 142 error = ENOMEM; 143 goto out; 144 } 145 } 146 147 while (ioctl(g_fd, ioc, &zc) != 0) { 148 if (errno == ENOMEM && resultp != NULL) { 149 free((void *)(uintptr_t)zc.zc_nvlist_dst); 150 zc.zc_nvlist_dst_size *= 2; 151 zc.zc_nvlist_dst = (uint64_t)(uintptr_t) 152 malloc(zc.zc_nvlist_dst_size); 153 if (zc.zc_nvlist_dst == NULL) { 154 error = ENOMEM; 155 goto out; 156 } 157 } else { 158 error = errno; 159 break; 160 } 161 } 162 if (zc.zc_nvlist_dst_filled) { 163 *resultp = fnvlist_unpack((void *)(uintptr_t)zc.zc_nvlist_dst, 164 zc.zc_nvlist_dst_size); 165 } 166 167 out: 168 fnvlist_pack_free(packed, size); 169 free((void *)(uintptr_t)zc.zc_nvlist_dst); 170 return (error); 171 } 172 173 int 174 lzc_create(const char *fsname, dmu_objset_type_t type, nvlist_t *props) 175 { 176 int error; 177 nvlist_t *args = fnvlist_alloc(); 178 fnvlist_add_int32(args, "type", type); 179 if (props != NULL) 180 fnvlist_add_nvlist(args, "props", props); 181 error = lzc_ioctl(ZFS_IOC_CREATE, fsname, args, NULL); 182 nvlist_free(args); 183 return (error); 184 } 185 186 int 187 lzc_clone(const char *fsname, const char *origin, 188 nvlist_t *props) 189 { 190 int error; 191 nvlist_t *args = fnvlist_alloc(); 192 fnvlist_add_string(args, "origin", origin); 193 if (props != NULL) 194 fnvlist_add_nvlist(args, "props", props); 195 error = lzc_ioctl(ZFS_IOC_CLONE, fsname, args, NULL); 196 nvlist_free(args); 197 return (error); 198 } 199 200 /* 201 * Creates snapshots. 202 * 203 * The keys in the snaps nvlist are the snapshots to be created. 204 * They must all be in the same pool. 205 * 206 * The props nvlist is properties to set. Currently only user properties 207 * are supported. { user:prop_name -> string value } 208 * 209 * The returned results nvlist will have an entry for each snapshot that failed. 210 * The value will be the (int32) error code. 211 * 212 * The return value will be 0 if all snapshots were created, otherwise it will 213 * be the errno of a (unspecified) snapshot that failed. 214 */ 215 int 216 lzc_snapshot(nvlist_t *snaps, nvlist_t *props, nvlist_t **errlist) 217 { 218 nvpair_t *elem; 219 nvlist_t *args; 220 int error; 221 char pool[MAXNAMELEN]; 222 223 *errlist = NULL; 224 225 /* determine the pool name */ 226 elem = nvlist_next_nvpair(snaps, NULL); 227 if (elem == NULL) 228 return (0); 229 (void) strlcpy(pool, nvpair_name(elem), sizeof (pool)); 230 pool[strcspn(pool, "/@")] = '\0'; 231 232 args = fnvlist_alloc(); 233 fnvlist_add_nvlist(args, "snaps", snaps); 234 if (props != NULL) 235 fnvlist_add_nvlist(args, "props", props); 236 237 error = lzc_ioctl(ZFS_IOC_SNAPSHOT, pool, args, errlist); 238 nvlist_free(args); 239 240 return (error); 241 } 242 243 /* 244 * Destroys snapshots. 245 * 246 * The keys in the snaps nvlist are the snapshots to be destroyed. 247 * They must all be in the same pool. 248 * 249 * Snapshots that do not exist will be silently ignored. 250 * 251 * If 'defer' is not set, and a snapshot has user holds or clones, the 252 * destroy operation will fail and none of the snapshots will be 253 * destroyed. 254 * 255 * If 'defer' is set, and a snapshot has user holds or clones, it will be 256 * marked for deferred destruction, and will be destroyed when the last hold 257 * or clone is removed/destroyed. 258 * 259 * The return value will be 0 if all snapshots were destroyed (or marked for 260 * later destruction if 'defer' is set) or didn't exist to begin with. 261 * 262 * Otherwise the return value will be the errno of a (unspecified) snapshot 263 * that failed, no snapshots will be destroyed, and the errlist will have an 264 * entry for each snapshot that failed. The value in the errlist will be 265 * the (int32) error code. 266 */ 267 int 268 lzc_destroy_snaps(nvlist_t *snaps, boolean_t defer, nvlist_t **errlist) 269 { 270 nvpair_t *elem; 271 nvlist_t *args; 272 int error; 273 char pool[MAXNAMELEN]; 274 275 /* determine the pool name */ 276 elem = nvlist_next_nvpair(snaps, NULL); 277 if (elem == NULL) 278 return (0); 279 (void) strlcpy(pool, nvpair_name(elem), sizeof (pool)); 280 pool[strcspn(pool, "/@")] = '\0'; 281 282 args = fnvlist_alloc(); 283 fnvlist_add_nvlist(args, "snaps", snaps); 284 if (defer) 285 fnvlist_add_boolean(args, "defer"); 286 287 error = lzc_ioctl(ZFS_IOC_DESTROY_SNAPS, pool, args, errlist); 288 nvlist_free(args); 289 290 return (error); 291 } 292 293 int 294 lzc_snaprange_space(const char *firstsnap, const char *lastsnap, 295 uint64_t *usedp) 296 { 297 nvlist_t *args; 298 nvlist_t *result; 299 int err; 300 char fs[MAXNAMELEN]; 301 char *atp; 302 303 /* determine the fs name */ 304 (void) strlcpy(fs, firstsnap, sizeof (fs)); 305 atp = strchr(fs, '@'); 306 if (atp == NULL) 307 return (EINVAL); 308 *atp = '\0'; 309 310 args = fnvlist_alloc(); 311 fnvlist_add_string(args, "firstsnap", firstsnap); 312 313 err = lzc_ioctl(ZFS_IOC_SPACE_SNAPS, lastsnap, args, &result); 314 nvlist_free(args); 315 if (err == 0) 316 *usedp = fnvlist_lookup_uint64(result, "used"); 317 fnvlist_free(result); 318 319 return (err); 320 } 321 322 boolean_t 323 lzc_exists(const char *dataset) 324 { 325 /* 326 * The objset_stats ioctl is still legacy, so we need to construct our 327 * own zfs_cmd_t rather than using zfsc_ioctl(). 328 */ 329 zfs_cmd_t zc = { 0 }; 330 331 (void) strlcpy(zc.zc_name, dataset, sizeof (zc.zc_name)); 332 return (ioctl(g_fd, ZFS_IOC_OBJSET_STATS, &zc) == 0); 333 } 334 335 /* 336 * Create "user holds" on snapshots. If there is a hold on a snapshot, 337 * the snapshot can not be destroyed. (However, it can be marked for deletion 338 * by lzc_destroy_snaps(defer=B_TRUE).) 339 * 340 * The keys in the nvlist are snapshot names. 341 * The snapshots must all be in the same pool. 342 * The value is the name of the hold (string type). 343 * 344 * If cleanup_fd is not -1, it must be the result of open("/dev/zfs", O_EXCL). 345 * In this case, when the cleanup_fd is closed (including on process 346 * termination), the holds will be released. If the system is shut down 347 * uncleanly, the holds will be released when the pool is next opened 348 * or imported. 349 * 350 * Holds for snapshots which don't exist will be skipped and have an entry 351 * added to errlist, but will not cause an overall failure. 352 * 353 * The return value will be 0 if all holds, for snapshots that existed, 354 * were succesfully created. 355 * 356 * Otherwise the return value will be the errno of a (unspecified) hold that 357 * failed and no holds will be created. 358 * 359 * In all cases the errlist will have an entry for each hold that failed 360 * (name = snapshot), with its value being the error code (int32). 361 */ 362 int 363 lzc_hold(nvlist_t *holds, int cleanup_fd, nvlist_t **errlist) 364 { 365 char pool[MAXNAMELEN]; 366 nvlist_t *args; 367 nvpair_t *elem; 368 int error; 369 370 /* determine the pool name */ 371 elem = nvlist_next_nvpair(holds, NULL); 372 if (elem == NULL) 373 return (0); 374 (void) strlcpy(pool, nvpair_name(elem), sizeof (pool)); 375 pool[strcspn(pool, "/@")] = '\0'; 376 377 args = fnvlist_alloc(); 378 fnvlist_add_nvlist(args, "holds", holds); 379 if (cleanup_fd != -1) 380 fnvlist_add_int32(args, "cleanup_fd", cleanup_fd); 381 382 error = lzc_ioctl(ZFS_IOC_HOLD, pool, args, errlist); 383 nvlist_free(args); 384 return (error); 385 } 386 387 /* 388 * Release "user holds" on snapshots. If the snapshot has been marked for 389 * deferred destroy (by lzc_destroy_snaps(defer=B_TRUE)), it does not have 390 * any clones, and all the user holds are removed, then the snapshot will be 391 * destroyed. 392 * 393 * The keys in the nvlist are snapshot names. 394 * The snapshots must all be in the same pool. 395 * The value is a nvlist whose keys are the holds to remove. 396 * 397 * Holds which failed to release because they didn't exist will have an entry 398 * added to errlist, but will not cause an overall failure. 399 * 400 * The return value will be 0 if the nvl holds was empty or all holds that 401 * existed, were successfully removed. 402 * 403 * Otherwise the return value will be the errno of a (unspecified) hold that 404 * failed to release and no holds will be released. 405 * 406 * In all cases the errlist will have an entry for each hold that failed to 407 * to release. 408 */ 409 int 410 lzc_release(nvlist_t *holds, nvlist_t **errlist) 411 { 412 char pool[MAXNAMELEN]; 413 nvpair_t *elem; 414 415 /* determine the pool name */ 416 elem = nvlist_next_nvpair(holds, NULL); 417 if (elem == NULL) 418 return (0); 419 (void) strlcpy(pool, nvpair_name(elem), sizeof (pool)); 420 pool[strcspn(pool, "/@")] = '\0'; 421 422 return (lzc_ioctl(ZFS_IOC_RELEASE, pool, holds, errlist)); 423 } 424 425 /* 426 * Retrieve list of user holds on the specified snapshot. 427 * 428 * On success, *holdsp will be set to a nvlist which the caller must free. 429 * The keys are the names of the holds, and the value is the creation time 430 * of the hold (uint64) in seconds since the epoch. 431 */ 432 int 433 lzc_get_holds(const char *snapname, nvlist_t **holdsp) 434 { 435 int error; 436 nvlist_t *innvl = fnvlist_alloc(); 437 error = lzc_ioctl(ZFS_IOC_GET_HOLDS, snapname, innvl, holdsp); 438 fnvlist_free(innvl); 439 return (error); 440 } 441 442 /* 443 * Generate a zfs send stream for the specified snapshot and write it to 444 * the specified file descriptor. 445 * 446 * "snapname" is the full name of the snapshot to send (e.g. "pool/fs@snap") 447 * 448 * If "from" is NULL, a full (non-incremental) stream will be sent. 449 * If "from" is non-NULL, it must be the full name of a snapshot or 450 * bookmark to send an incremental from (e.g. "pool/fs@earlier_snap" or 451 * "pool/fs#earlier_bmark"). If non-NULL, the specified snapshot or 452 * bookmark must represent an earlier point in the history of "snapname"). 453 * It can be an earlier snapshot in the same filesystem or zvol as "snapname", 454 * or it can be the origin of "snapname"'s filesystem, or an earlier 455 * snapshot in the origin, etc. 456 * 457 * "fd" is the file descriptor to write the send stream to. 458 * 459 * If "flags" contains LZC_SEND_FLAG_LARGE_BLOCK, the stream is permitted 460 * to contain DRR_WRITE records with drr_length > 128K, and DRR_OBJECT 461 * records with drr_blksz > 128K. 462 * 463 * If "flags" contains LZC_SEND_FLAG_EMBED_DATA, the stream is permitted 464 * to contain DRR_WRITE_EMBEDDED records with drr_etype==BP_EMBEDDED_TYPE_DATA, 465 * which the receiving system must support (as indicated by support 466 * for the "embedded_data" feature). 467 */ 468 int 469 lzc_send(const char *snapname, const char *from, int fd, 470 enum lzc_send_flags flags) 471 { 472 return (lzc_send_resume(snapname, from, fd, flags, 0, 0)); 473 } 474 475 int 476 lzc_send_resume(const char *snapname, const char *from, int fd, 477 enum lzc_send_flags flags, uint64_t resumeobj, uint64_t resumeoff) 478 { 479 nvlist_t *args; 480 int err; 481 482 args = fnvlist_alloc(); 483 fnvlist_add_int32(args, "fd", fd); 484 if (from != NULL) 485 fnvlist_add_string(args, "fromsnap", from); 486 if (flags & LZC_SEND_FLAG_LARGE_BLOCK) 487 fnvlist_add_boolean(args, "largeblockok"); 488 if (flags & LZC_SEND_FLAG_EMBED_DATA) 489 fnvlist_add_boolean(args, "embedok"); 490 if (flags & LZC_SEND_FLAG_SKIP_FREE) 491 fnvlist_add_boolean(args, "skip_free"); 492 if (resumeobj != 0 || resumeoff != 0) { 493 fnvlist_add_uint64(args, "resume_object", resumeobj); 494 fnvlist_add_uint64(args, "resume_offset", resumeoff); 495 } 496 err = lzc_ioctl(ZFS_IOC_SEND_NEW, snapname, args, NULL); 497 nvlist_free(args); 498 return (err); 499 } 500 501 /* 502 * "from" can be NULL, a snapshot, or a bookmark. 503 * 504 * If from is NULL, a full (non-incremental) stream will be estimated. This 505 * is calculated very efficiently. 506 * 507 * If from is a snapshot, lzc_send_space uses the deadlists attached to 508 * each snapshot to efficiently estimate the stream size. 509 * 510 * If from is a bookmark, the indirect blocks in the destination snapshot 511 * are traversed, looking for blocks with a birth time since the creation TXG of 512 * the snapshot this bookmark was created from. This will result in 513 * significantly more I/O and be less efficient than a send space estimation on 514 * an equivalent snapshot. 515 */ 516 int 517 lzc_send_space(const char *snapname, const char *from, uint64_t *spacep) 518 { 519 nvlist_t *args; 520 nvlist_t *result; 521 int err; 522 523 args = fnvlist_alloc(); 524 if (from != NULL) 525 fnvlist_add_string(args, "from", from); 526 err = lzc_ioctl(ZFS_IOC_SEND_SPACE, snapname, args, &result); 527 nvlist_free(args); 528 if (err == 0) 529 *spacep = fnvlist_lookup_uint64(result, "space"); 530 nvlist_free(result); 531 return (err); 532 } 533 534 static int 535 recv_read(int fd, void *buf, int ilen) 536 { 537 char *cp = buf; 538 int rv; 539 int len = ilen; 540 541 do { 542 rv = read(fd, cp, len); 543 cp += rv; 544 len -= rv; 545 } while (rv > 0); 546 547 if (rv < 0 || len != 0) 548 return (EIO); 549 550 return (0); 551 } 552 553 static int 554 recv_impl(const char *snapname, nvlist_t *props, const char *origin, 555 boolean_t force, boolean_t resumable, int fd, 556 const dmu_replay_record_t *begin_record) 557 { 558 /* 559 * The receive ioctl is still legacy, so we need to construct our own 560 * zfs_cmd_t rather than using zfsc_ioctl(). 561 */ 562 zfs_cmd_t zc = { 0 }; 563 char *atp; 564 char *packed = NULL; 565 size_t size; 566 int error; 567 568 ASSERT3S(g_refcount, >, 0); 569 570 /* zc_name is name of containing filesystem */ 571 (void) strlcpy(zc.zc_name, snapname, sizeof (zc.zc_name)); 572 atp = strchr(zc.zc_name, '@'); 573 if (atp == NULL) 574 return (EINVAL); 575 *atp = '\0'; 576 577 /* if the fs does not exist, try its parent. */ 578 if (!lzc_exists(zc.zc_name)) { 579 char *slashp = strrchr(zc.zc_name, '/'); 580 if (slashp == NULL) 581 return (ENOENT); 582 *slashp = '\0'; 583 584 } 585 586 /* zc_value is full name of the snapshot to create */ 587 (void) strlcpy(zc.zc_value, snapname, sizeof (zc.zc_value)); 588 589 if (props != NULL) { 590 /* zc_nvlist_src is props to set */ 591 packed = fnvlist_pack(props, &size); 592 zc.zc_nvlist_src = (uint64_t)(uintptr_t)packed; 593 zc.zc_nvlist_src_size = size; 594 } 595 596 /* zc_string is name of clone origin (if DRR_FLAG_CLONE) */ 597 if (origin != NULL) 598 (void) strlcpy(zc.zc_string, origin, sizeof (zc.zc_string)); 599 600 /* zc_begin_record is non-byteswapped BEGIN record */ 601 if (begin_record == NULL) { 602 error = recv_read(fd, &zc.zc_begin_record, 603 sizeof (zc.zc_begin_record)); 604 if (error != 0) 605 goto out; 606 } else { 607 zc.zc_begin_record = *begin_record; 608 } 609 610 /* zc_cookie is fd to read from */ 611 zc.zc_cookie = fd; 612 613 /* zc guid is force flag */ 614 zc.zc_guid = force; 615 616 zc.zc_resumable = resumable; 617 618 /* zc_cleanup_fd is unused */ 619 zc.zc_cleanup_fd = -1; 620 621 error = ioctl(g_fd, ZFS_IOC_RECV, &zc); 622 if (error != 0) 623 error = errno; 624 625 out: 626 if (packed != NULL) 627 fnvlist_pack_free(packed, size); 628 free((void*)(uintptr_t)zc.zc_nvlist_dst); 629 return (error); 630 } 631 632 /* 633 * The simplest receive case: receive from the specified fd, creating the 634 * specified snapshot. Apply the specified properties as "received" properties 635 * (which can be overridden by locally-set properties). If the stream is a 636 * clone, its origin snapshot must be specified by 'origin'. The 'force' 637 * flag will cause the target filesystem to be rolled back or destroyed if 638 * necessary to receive. 639 * 640 * Return 0 on success or an errno on failure. 641 * 642 * Note: this interface does not work on dedup'd streams 643 * (those with DMU_BACKUP_FEATURE_DEDUP). 644 */ 645 int 646 lzc_receive(const char *snapname, nvlist_t *props, const char *origin, 647 boolean_t force, int fd) 648 { 649 return (recv_impl(snapname, props, origin, force, B_FALSE, fd, NULL)); 650 } 651 652 /* 653 * Like lzc_receive, but if the receive fails due to premature stream 654 * termination, the intermediate state will be preserved on disk. In this 655 * case, ECKSUM will be returned. The receive may subsequently be resumed 656 * with a resuming send stream generated by lzc_send_resume(). 657 */ 658 int 659 lzc_receive_resumable(const char *snapname, nvlist_t *props, const char *origin, 660 boolean_t force, int fd) 661 { 662 return (recv_impl(snapname, props, origin, force, B_TRUE, fd, NULL)); 663 } 664 665 /* 666 * Like lzc_receive, but allows the caller to read the begin record and then to 667 * pass it in. That could be useful if the caller wants to derive, for example, 668 * the snapname or the origin parameters based on the information contained in 669 * the begin record. 670 * The begin record must be in its original form as read from the stream, 671 * in other words, it should not be byteswapped. 672 * 673 * The 'resumable' parameter allows to obtain the same behavior as with 674 * lzc_receive_resumable. 675 */ 676 int 677 lzc_receive_with_header(const char *snapname, nvlist_t *props, 678 const char *origin, boolean_t force, boolean_t resumable, int fd, 679 const dmu_replay_record_t *begin_record) 680 { 681 if (begin_record == NULL) 682 return (EINVAL); 683 return (recv_impl(snapname, props, origin, force, resumable, fd, 684 begin_record)); 685 } 686 687 /* 688 * Roll back this filesystem or volume to its most recent snapshot. 689 * If snapnamebuf is not NULL, it will be filled in with the name 690 * of the most recent snapshot. 691 * 692 * Return 0 on success or an errno on failure. 693 */ 694 int 695 lzc_rollback(const char *fsname, char *snapnamebuf, int snapnamelen) 696 { 697 nvlist_t *args; 698 nvlist_t *result; 699 int err; 700 701 args = fnvlist_alloc(); 702 err = lzc_ioctl(ZFS_IOC_ROLLBACK, fsname, args, &result); 703 nvlist_free(args); 704 if (err == 0 && snapnamebuf != NULL) { 705 const char *snapname = fnvlist_lookup_string(result, "target"); 706 (void) strlcpy(snapnamebuf, snapname, snapnamelen); 707 } 708 return (err); 709 } 710 711 /* 712 * Creates bookmarks. 713 * 714 * The bookmarks nvlist maps from name of the bookmark (e.g. "pool/fs#bmark") to 715 * the name of the snapshot (e.g. "pool/fs@snap"). All the bookmarks and 716 * snapshots must be in the same pool. 717 * 718 * The returned results nvlist will have an entry for each bookmark that failed. 719 * The value will be the (int32) error code. 720 * 721 * The return value will be 0 if all bookmarks were created, otherwise it will 722 * be the errno of a (undetermined) bookmarks that failed. 723 */ 724 int 725 lzc_bookmark(nvlist_t *bookmarks, nvlist_t **errlist) 726 { 727 nvpair_t *elem; 728 int error; 729 char pool[MAXNAMELEN]; 730 731 /* determine the pool name */ 732 elem = nvlist_next_nvpair(bookmarks, NULL); 733 if (elem == NULL) 734 return (0); 735 (void) strlcpy(pool, nvpair_name(elem), sizeof (pool)); 736 pool[strcspn(pool, "/#")] = '\0'; 737 738 error = lzc_ioctl(ZFS_IOC_BOOKMARK, pool, bookmarks, errlist); 739 740 return (error); 741 } 742 743 /* 744 * Retrieve bookmarks. 745 * 746 * Retrieve the list of bookmarks for the given file system. The props 747 * parameter is an nvlist of property names (with no values) that will be 748 * returned for each bookmark. 749 * 750 * The following are valid properties on bookmarks, all of which are numbers 751 * (represented as uint64 in the nvlist) 752 * 753 * "guid" - globally unique identifier of the snapshot it refers to 754 * "createtxg" - txg when the snapshot it refers to was created 755 * "creation" - timestamp when the snapshot it refers to was created 756 * 757 * The format of the returned nvlist as follows: 758 * <short name of bookmark> -> { 759 * <name of property> -> { 760 * "value" -> uint64 761 * } 762 * } 763 */ 764 int 765 lzc_get_bookmarks(const char *fsname, nvlist_t *props, nvlist_t **bmarks) 766 { 767 return (lzc_ioctl(ZFS_IOC_GET_BOOKMARKS, fsname, props, bmarks)); 768 } 769 770 /* 771 * Destroys bookmarks. 772 * 773 * The keys in the bmarks nvlist are the bookmarks to be destroyed. 774 * They must all be in the same pool. Bookmarks are specified as 775 * <fs>#<bmark>. 776 * 777 * Bookmarks that do not exist will be silently ignored. 778 * 779 * The return value will be 0 if all bookmarks that existed were destroyed. 780 * 781 * Otherwise the return value will be the errno of a (undetermined) bookmark 782 * that failed, no bookmarks will be destroyed, and the errlist will have an 783 * entry for each bookmarks that failed. The value in the errlist will be 784 * the (int32) error code. 785 */ 786 int 787 lzc_destroy_bookmarks(nvlist_t *bmarks, nvlist_t **errlist) 788 { 789 nvpair_t *elem; 790 int error; 791 char pool[MAXNAMELEN]; 792 793 /* determine the pool name */ 794 elem = nvlist_next_nvpair(bmarks, NULL); 795 if (elem == NULL) 796 return (0); 797 (void) strlcpy(pool, nvpair_name(elem), sizeof (pool)); 798 pool[strcspn(pool, "/#")] = '\0'; 799 800 error = lzc_ioctl(ZFS_IOC_DESTROY_BOOKMARKS, pool, bmarks, errlist); 801 802 return (error); 803 }