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, 2017 by Delphix. All rights reserved. 24 * Copyright (c) 2013 Steven Hartland. All rights reserved. 25 * Copyright (c) 2014 Integros [integros.com] 26 * Copyright 2017 RackTop Systems. 27 * Copyright (c) 2017 Datto Inc. 28 */ 29 30 /* 31 * LibZFS_Core (lzc) is intended to replace most functionality in libzfs. 32 * It has the following characteristics: 33 * 34 * - Thread Safe. libzfs_core is accessible concurrently from multiple 35 * threads. This is accomplished primarily by avoiding global data 36 * (e.g. caching). Since it's thread-safe, there is no reason for a 37 * process to have multiple libzfs "instances". Therefore, we store 38 * our few pieces of data (e.g. the file descriptor) in global 39 * variables. The fd is reference-counted so that the libzfs_core 40 * library can be "initialized" multiple times (e.g. by different 41 * consumers within the same process). 42 * 43 * - Committed Interface. The libzfs_core interface will be committed, 44 * therefore consumers can compile against it and be confident that 45 * their code will continue to work on future releases of this code. 46 * Currently, the interface is Evolving (not Committed), but we intend 47 * to commit to it once it is more complete and we determine that it 48 * meets the needs of all consumers. 49 * 50 * - Programatic Error Handling. libzfs_core communicates errors with 51 * defined error numbers, and doesn't print anything to stdout/stderr. 52 * 53 * - Thin Layer. libzfs_core is a thin layer, marshaling arguments 54 * to/from the kernel ioctls. There is generally a 1:1 correspondence 55 * between libzfs_core functions and ioctls to /dev/zfs. 56 * 57 * - Clear Atomicity. Because libzfs_core functions are generally 1:1 58 * with kernel ioctls, and kernel ioctls are general atomic, each 59 * libzfs_core function is atomic. For example, creating multiple 60 * snapshots with a single call to lzc_snapshot() is atomic -- it 61 * can't fail with only some of the requested snapshots created, even 62 * in the event of power loss or system crash. 63 * 64 * - Continued libzfs Support. Some higher-level operations (e.g. 65 * support for "zfs send -R") are too complicated to fit the scope of 66 * libzfs_core. This functionality will continue to live in libzfs. 67 * Where appropriate, libzfs will use the underlying atomic operations 68 * of libzfs_core. For example, libzfs may implement "zfs send -R | 69 * zfs receive" by using individual "send one snapshot", rename, 70 * destroy, and "receive one snapshot" operations in libzfs_core. 71 * /sbin/zfs and /zbin/zpool will link with both libzfs and 72 * libzfs_core. Other consumers should aim to use only libzfs_core, 73 * since that will be the supported, stable interface going forwards. 74 */ 75 76 #include <libzfs_core.h> 77 #include <ctype.h> 78 #include <unistd.h> 79 #include <stdlib.h> 80 #include <string.h> 81 #include <errno.h> 82 #include <fcntl.h> 83 #include <pthread.h> 84 #include <sys/nvpair.h> 85 #include <sys/param.h> 86 #include <sys/types.h> 87 #include <sys/stat.h> 88 #include <sys/zfs_ioctl.h> 89 90 static int g_fd = -1; 91 static pthread_mutex_t g_lock = PTHREAD_MUTEX_INITIALIZER; 92 static int g_refcount; 93 94 int 95 libzfs_core_init(void) 96 { 97 (void) pthread_mutex_lock(&g_lock); 98 if (g_refcount == 0) { 99 g_fd = open("/dev/zfs", O_RDWR); 100 if (g_fd < 0) { 101 (void) pthread_mutex_unlock(&g_lock); 102 return (errno); 103 } 104 } 105 g_refcount++; 106 (void) pthread_mutex_unlock(&g_lock); 107 return (0); 108 } 109 110 void 111 libzfs_core_fini(void) 112 { 113 (void) pthread_mutex_lock(&g_lock); 114 ASSERT3S(g_refcount, >, 0); 115 116 if (g_refcount > 0) 117 g_refcount--; 118 119 if (g_refcount == 0 && g_fd != -1) { 120 (void) close(g_fd); 121 g_fd = -1; 122 } 123 (void) pthread_mutex_unlock(&g_lock); 124 } 125 126 static int 127 lzc_ioctl(zfs_ioc_t ioc, const char *name, 128 nvlist_t *source, nvlist_t **resultp) 129 { 130 zfs_cmd_t zc = { 0 }; 131 int error = 0; 132 char *packed = NULL; 133 size_t size = 0; 134 135 ASSERT3S(g_refcount, >, 0); 136 VERIFY3S(g_fd, !=, -1); 137 138 if (name != NULL) 139 (void) strlcpy(zc.zc_name, name, sizeof (zc.zc_name)); 140 141 if (source != NULL) { 142 packed = fnvlist_pack(source, &size); 143 zc.zc_nvlist_src = (uint64_t)(uintptr_t)packed; 144 zc.zc_nvlist_src_size = size; 145 } 146 147 if (resultp != NULL) { 148 *resultp = NULL; 149 if (ioc == ZFS_IOC_CHANNEL_PROGRAM) { 150 zc.zc_nvlist_dst_size = fnvlist_lookup_uint64(source, 151 ZCP_ARG_MEMLIMIT); 152 } else { 153 zc.zc_nvlist_dst_size = MAX(size * 2, 128 * 1024); 154 } 155 zc.zc_nvlist_dst = (uint64_t)(uintptr_t) 156 malloc(zc.zc_nvlist_dst_size); 157 if (zc.zc_nvlist_dst == 0) { 158 error = ENOMEM; 159 goto out; 160 } 161 } 162 163 while (ioctl(g_fd, ioc, &zc) != 0) { 164 /* 165 * If ioctl exited with ENOMEM, we retry the ioctl after 166 * increasing the size of the destination nvlist. 167 * 168 * Channel programs that exit with ENOMEM ran over the 169 * lua memory sandbox; they should not be retried. 170 */ 171 if (errno == ENOMEM && resultp != NULL && 172 ioc != ZFS_IOC_CHANNEL_PROGRAM) { 173 free((void *)(uintptr_t)zc.zc_nvlist_dst); 174 zc.zc_nvlist_dst_size *= 2; 175 zc.zc_nvlist_dst = (uint64_t)(uintptr_t) 176 malloc(zc.zc_nvlist_dst_size); 177 if (zc.zc_nvlist_dst == 0) { 178 error = ENOMEM; 179 goto out; 180 } 181 } else { 182 error = errno; 183 break; 184 } 185 } 186 if (zc.zc_nvlist_dst_filled) { 187 *resultp = fnvlist_unpack((void *)(uintptr_t)zc.zc_nvlist_dst, 188 zc.zc_nvlist_dst_size); 189 } 190 191 out: 192 if (packed != NULL) 193 fnvlist_pack_free(packed, size); 194 free((void *)(uintptr_t)zc.zc_nvlist_dst); 195 return (error); 196 } 197 198 int 199 lzc_create(const char *fsname, enum lzc_dataset_type type, nvlist_t *props, 200 uint8_t *wkeydata, uint_t wkeylen) 201 { 202 int error; 203 nvlist_t *hidden_args = NULL; 204 nvlist_t *args = fnvlist_alloc(); 205 206 fnvlist_add_int32(args, "type", (dmu_objset_type_t)type); 207 if (props != NULL) 208 fnvlist_add_nvlist(args, "props", props); 209 210 if (wkeydata != NULL) { 211 hidden_args = fnvlist_alloc(); 212 fnvlist_add_uint8_array(hidden_args, "wkeydata", wkeydata, 213 wkeylen); 214 fnvlist_add_nvlist(args, ZPOOL_HIDDEN_ARGS, hidden_args); 215 } 216 217 error = lzc_ioctl(ZFS_IOC_CREATE, fsname, args, NULL); 218 nvlist_free(hidden_args); 219 nvlist_free(args); 220 return (error); 221 } 222 223 int 224 lzc_clone(const char *fsname, const char *origin, nvlist_t *props) 225 { 226 int error; 227 nvlist_t *hidden_args = NULL; 228 nvlist_t *args = fnvlist_alloc(); 229 230 fnvlist_add_string(args, "origin", origin); 231 if (props != NULL) 232 fnvlist_add_nvlist(args, "props", props); 233 error = lzc_ioctl(ZFS_IOC_CLONE, fsname, args, NULL); 234 nvlist_free(hidden_args); 235 nvlist_free(args); 236 return (error); 237 } 238 239 int 240 lzc_promote(const char *fsname, char *snapnamebuf, int snapnamelen) 241 { 242 /* 243 * The promote ioctl is still legacy, so we need to construct our 244 * own zfs_cmd_t rather than using lzc_ioctl(). 245 */ 246 zfs_cmd_t zc = { 0 }; 247 248 ASSERT3S(g_refcount, >, 0); 249 VERIFY3S(g_fd, !=, -1); 250 251 (void) strlcpy(zc.zc_name, fsname, sizeof (zc.zc_name)); 252 if (ioctl(g_fd, ZFS_IOC_PROMOTE, &zc) != 0) { 253 int error = errno; 254 if (error == EEXIST && snapnamebuf != NULL) 255 (void) strlcpy(snapnamebuf, zc.zc_string, snapnamelen); 256 return (error); 257 } 258 return (0); 259 } 260 261 int 262 lzc_remap(const char *fsname) 263 { 264 int error; 265 nvlist_t *args = fnvlist_alloc(); 266 error = lzc_ioctl(ZFS_IOC_REMAP, fsname, args, NULL); 267 nvlist_free(args); 268 return (error); 269 } 270 271 int 272 lzc_rename(const char *source, const char *target) 273 { 274 zfs_cmd_t zc = { 0 }; 275 int error; 276 277 ASSERT3S(g_refcount, >, 0); 278 VERIFY3S(g_fd, !=, -1); 279 280 (void) strlcpy(zc.zc_name, source, sizeof (zc.zc_name)); 281 (void) strlcpy(zc.zc_value, target, sizeof (zc.zc_value)); 282 error = ioctl(g_fd, ZFS_IOC_RENAME, &zc); 283 if (error != 0) 284 error = errno; 285 return (error); 286 } 287 288 int 289 lzc_destroy(const char *fsname) 290 { 291 int error; 292 293 nvlist_t *args = fnvlist_alloc(); 294 error = lzc_ioctl(ZFS_IOC_DESTROY, fsname, args, NULL); 295 nvlist_free(args); 296 return (error); 297 } 298 299 /* 300 * Creates snapshots. 301 * 302 * The keys in the snaps nvlist are the snapshots to be created. 303 * They must all be in the same pool. 304 * 305 * The props nvlist is properties to set. Currently only user properties 306 * are supported. { user:prop_name -> string value } 307 * 308 * The returned results nvlist will have an entry for each snapshot that failed. 309 * The value will be the (int32) error code. 310 * 311 * The return value will be 0 if all snapshots were created, otherwise it will 312 * be the errno of a (unspecified) snapshot that failed. 313 */ 314 int 315 lzc_snapshot(nvlist_t *snaps, nvlist_t *props, nvlist_t **errlist) 316 { 317 nvpair_t *elem; 318 nvlist_t *args; 319 int error; 320 char pool[ZFS_MAX_DATASET_NAME_LEN]; 321 322 *errlist = NULL; 323 324 /* determine the pool name */ 325 elem = nvlist_next_nvpair(snaps, NULL); 326 if (elem == NULL) 327 return (0); 328 (void) strlcpy(pool, nvpair_name(elem), sizeof (pool)); 329 pool[strcspn(pool, "/@")] = '\0'; 330 331 args = fnvlist_alloc(); 332 fnvlist_add_nvlist(args, "snaps", snaps); 333 if (props != NULL) 334 fnvlist_add_nvlist(args, "props", props); 335 336 error = lzc_ioctl(ZFS_IOC_SNAPSHOT, pool, args, errlist); 337 nvlist_free(args); 338 339 return (error); 340 } 341 342 /* 343 * Destroys snapshots. 344 * 345 * The keys in the snaps nvlist are the snapshots to be destroyed. 346 * They must all be in the same pool. 347 * 348 * Snapshots that do not exist will be silently ignored. 349 * 350 * If 'defer' is not set, and a snapshot has user holds or clones, the 351 * destroy operation will fail and none of the snapshots will be 352 * destroyed. 353 * 354 * If 'defer' is set, and a snapshot has user holds or clones, it will be 355 * marked for deferred destruction, and will be destroyed when the last hold 356 * or clone is removed/destroyed. 357 * 358 * The return value will be 0 if all snapshots were destroyed (or marked for 359 * later destruction if 'defer' is set) or didn't exist to begin with. 360 * 361 * Otherwise the return value will be the errno of a (unspecified) snapshot 362 * that failed, no snapshots will be destroyed, and the errlist will have an 363 * entry for each snapshot that failed. The value in the errlist will be 364 * the (int32) error code. 365 */ 366 int 367 lzc_destroy_snaps(nvlist_t *snaps, boolean_t defer, nvlist_t **errlist) 368 { 369 nvpair_t *elem; 370 nvlist_t *args; 371 int error; 372 char pool[ZFS_MAX_DATASET_NAME_LEN]; 373 374 /* determine the pool name */ 375 elem = nvlist_next_nvpair(snaps, NULL); 376 if (elem == NULL) 377 return (0); 378 (void) strlcpy(pool, nvpair_name(elem), sizeof (pool)); 379 pool[strcspn(pool, "/@")] = '\0'; 380 381 args = fnvlist_alloc(); 382 fnvlist_add_nvlist(args, "snaps", snaps); 383 if (defer) 384 fnvlist_add_boolean(args, "defer"); 385 386 error = lzc_ioctl(ZFS_IOC_DESTROY_SNAPS, pool, args, errlist); 387 nvlist_free(args); 388 389 return (error); 390 } 391 392 int 393 lzc_snaprange_space(const char *firstsnap, const char *lastsnap, 394 uint64_t *usedp) 395 { 396 nvlist_t *args; 397 nvlist_t *result; 398 int err; 399 char fs[ZFS_MAX_DATASET_NAME_LEN]; 400 char *atp; 401 402 /* determine the fs name */ 403 (void) strlcpy(fs, firstsnap, sizeof (fs)); 404 atp = strchr(fs, '@'); 405 if (atp == NULL) 406 return (EINVAL); 407 *atp = '\0'; 408 409 args = fnvlist_alloc(); 410 fnvlist_add_string(args, "firstsnap", firstsnap); 411 412 err = lzc_ioctl(ZFS_IOC_SPACE_SNAPS, lastsnap, args, &result); 413 nvlist_free(args); 414 if (err == 0) 415 *usedp = fnvlist_lookup_uint64(result, "used"); 416 fnvlist_free(result); 417 418 return (err); 419 } 420 421 boolean_t 422 lzc_exists(const char *dataset) 423 { 424 /* 425 * The objset_stats ioctl is still legacy, so we need to construct our 426 * own zfs_cmd_t rather than using lzc_ioctl(). 427 */ 428 zfs_cmd_t zc = { 0 }; 429 430 ASSERT3S(g_refcount, >, 0); 431 VERIFY3S(g_fd, !=, -1); 432 433 (void) strlcpy(zc.zc_name, dataset, sizeof (zc.zc_name)); 434 return (ioctl(g_fd, ZFS_IOC_OBJSET_STATS, &zc) == 0); 435 } 436 437 /* 438 * outnvl is unused. 439 * It was added to preserve the function signature in case it is 440 * needed in the future. 441 */ 442 /*ARGSUSED*/ 443 int 444 lzc_sync(const char *pool_name, nvlist_t *innvl, nvlist_t **outnvl) 445 { 446 return (lzc_ioctl(ZFS_IOC_POOL_SYNC, pool_name, innvl, NULL)); 447 } 448 449 /* 450 * Create "user holds" on snapshots. If there is a hold on a snapshot, 451 * the snapshot can not be destroyed. (However, it can be marked for deletion 452 * by lzc_destroy_snaps(defer=B_TRUE).) 453 * 454 * The keys in the nvlist are snapshot names. 455 * The snapshots must all be in the same pool. 456 * The value is the name of the hold (string type). 457 * 458 * If cleanup_fd is not -1, it must be the result of open("/dev/zfs", O_EXCL). 459 * In this case, when the cleanup_fd is closed (including on process 460 * termination), the holds will be released. If the system is shut down 461 * uncleanly, the holds will be released when the pool is next opened 462 * or imported. 463 * 464 * Holds for snapshots which don't exist will be skipped and have an entry 465 * added to errlist, but will not cause an overall failure. 466 * 467 * The return value will be 0 if all holds, for snapshots that existed, 468 * were succesfully created. 469 * 470 * Otherwise the return value will be the errno of a (unspecified) hold that 471 * failed and no holds will be created. 472 * 473 * In all cases the errlist will have an entry for each hold that failed 474 * (name = snapshot), with its value being the error code (int32). 475 */ 476 int 477 lzc_hold(nvlist_t *holds, int cleanup_fd, nvlist_t **errlist) 478 { 479 char pool[ZFS_MAX_DATASET_NAME_LEN]; 480 nvlist_t *args; 481 nvpair_t *elem; 482 int error; 483 484 /* determine the pool name */ 485 elem = nvlist_next_nvpair(holds, NULL); 486 if (elem == NULL) 487 return (0); 488 (void) strlcpy(pool, nvpair_name(elem), sizeof (pool)); 489 pool[strcspn(pool, "/@")] = '\0'; 490 491 args = fnvlist_alloc(); 492 fnvlist_add_nvlist(args, "holds", holds); 493 if (cleanup_fd != -1) 494 fnvlist_add_int32(args, "cleanup_fd", cleanup_fd); 495 496 error = lzc_ioctl(ZFS_IOC_HOLD, pool, args, errlist); 497 nvlist_free(args); 498 return (error); 499 } 500 501 /* 502 * Release "user holds" on snapshots. If the snapshot has been marked for 503 * deferred destroy (by lzc_destroy_snaps(defer=B_TRUE)), it does not have 504 * any clones, and all the user holds are removed, then the snapshot will be 505 * destroyed. 506 * 507 * The keys in the nvlist are snapshot names. 508 * The snapshots must all be in the same pool. 509 * The value is a nvlist whose keys are the holds to remove. 510 * 511 * Holds which failed to release because they didn't exist will have an entry 512 * added to errlist, but will not cause an overall failure. 513 * 514 * The return value will be 0 if the nvl holds was empty or all holds that 515 * existed, were successfully removed. 516 * 517 * Otherwise the return value will be the errno of a (unspecified) hold that 518 * failed to release and no holds will be released. 519 * 520 * In all cases the errlist will have an entry for each hold that failed to 521 * to release. 522 */ 523 int 524 lzc_release(nvlist_t *holds, nvlist_t **errlist) 525 { 526 char pool[ZFS_MAX_DATASET_NAME_LEN]; 527 nvpair_t *elem; 528 529 /* determine the pool name */ 530 elem = nvlist_next_nvpair(holds, NULL); 531 if (elem == NULL) 532 return (0); 533 (void) strlcpy(pool, nvpair_name(elem), sizeof (pool)); 534 pool[strcspn(pool, "/@")] = '\0'; 535 536 return (lzc_ioctl(ZFS_IOC_RELEASE, pool, holds, errlist)); 537 } 538 539 /* 540 * Retrieve list of user holds on the specified snapshot. 541 * 542 * On success, *holdsp will be set to a nvlist which the caller must free. 543 * The keys are the names of the holds, and the value is the creation time 544 * of the hold (uint64) in seconds since the epoch. 545 */ 546 int 547 lzc_get_holds(const char *snapname, nvlist_t **holdsp) 548 { 549 return (lzc_ioctl(ZFS_IOC_GET_HOLDS, snapname, NULL, holdsp)); 550 } 551 552 /* 553 * Generate a zfs send stream for the specified snapshot and write it to 554 * the specified file descriptor. 555 * 556 * "snapname" is the full name of the snapshot to send (e.g. "pool/fs@snap") 557 * 558 * If "from" is NULL, a full (non-incremental) stream will be sent. 559 * If "from" is non-NULL, it must be the full name of a snapshot or 560 * bookmark to send an incremental from (e.g. "pool/fs@earlier_snap" or 561 * "pool/fs#earlier_bmark"). If non-NULL, the specified snapshot or 562 * bookmark must represent an earlier point in the history of "snapname"). 563 * It can be an earlier snapshot in the same filesystem or zvol as "snapname", 564 * or it can be the origin of "snapname"'s filesystem, or an earlier 565 * snapshot in the origin, etc. 566 * 567 * "fd" is the file descriptor to write the send stream to. 568 * 569 * If "flags" contains LZC_SEND_FLAG_LARGE_BLOCK, the stream is permitted 570 * to contain DRR_WRITE records with drr_length > 128K, and DRR_OBJECT 571 * records with drr_blksz > 128K. 572 * 573 * If "flags" contains LZC_SEND_FLAG_EMBED_DATA, the stream is permitted 574 * to contain DRR_WRITE_EMBEDDED records with drr_etype==BP_EMBEDDED_TYPE_DATA, 575 * which the receiving system must support (as indicated by support 576 * for the "embedded_data" feature). 577 */ 578 int 579 lzc_send(const char *snapname, const char *from, int fd, 580 enum lzc_send_flags flags) 581 { 582 return (lzc_send_resume(snapname, from, fd, flags, 0, 0)); 583 } 584 585 int 586 lzc_send_resume(const char *snapname, const char *from, int fd, 587 enum lzc_send_flags flags, uint64_t resumeobj, uint64_t resumeoff) 588 { 589 nvlist_t *args; 590 int err; 591 592 args = fnvlist_alloc(); 593 fnvlist_add_int32(args, "fd", fd); 594 if (from != NULL) 595 fnvlist_add_string(args, "fromsnap", from); 596 if (flags & LZC_SEND_FLAG_LARGE_BLOCK) 597 fnvlist_add_boolean(args, "largeblockok"); 598 if (flags & LZC_SEND_FLAG_EMBED_DATA) 599 fnvlist_add_boolean(args, "embedok"); 600 if (flags & LZC_SEND_FLAG_COMPRESS) 601 fnvlist_add_boolean(args, "compressok"); 602 if (flags & LZC_SEND_FLAG_RAW) 603 fnvlist_add_boolean(args, "rawok"); 604 if (resumeobj != 0 || resumeoff != 0) { 605 fnvlist_add_uint64(args, "resume_object", resumeobj); 606 fnvlist_add_uint64(args, "resume_offset", resumeoff); 607 } 608 err = lzc_ioctl(ZFS_IOC_SEND_NEW, snapname, args, NULL); 609 nvlist_free(args); 610 return (err); 611 } 612 613 /* 614 * "from" can be NULL, a snapshot, or a bookmark. 615 * 616 * If from is NULL, a full (non-incremental) stream will be estimated. This 617 * is calculated very efficiently. 618 * 619 * If from is a snapshot, lzc_send_space uses the deadlists attached to 620 * each snapshot to efficiently estimate the stream size. 621 * 622 * If from is a bookmark, the indirect blocks in the destination snapshot 623 * are traversed, looking for blocks with a birth time since the creation TXG of 624 * the snapshot this bookmark was created from. This will result in 625 * significantly more I/O and be less efficient than a send space estimation on 626 * an equivalent snapshot. 627 */ 628 int 629 lzc_send_space(const char *snapname, const char *from, 630 enum lzc_send_flags flags, uint64_t *spacep) 631 { 632 nvlist_t *args; 633 nvlist_t *result; 634 int err; 635 636 args = fnvlist_alloc(); 637 if (from != NULL) 638 fnvlist_add_string(args, "from", from); 639 if (flags & LZC_SEND_FLAG_LARGE_BLOCK) 640 fnvlist_add_boolean(args, "largeblockok"); 641 if (flags & LZC_SEND_FLAG_EMBED_DATA) 642 fnvlist_add_boolean(args, "embedok"); 643 if (flags & LZC_SEND_FLAG_COMPRESS) 644 fnvlist_add_boolean(args, "compressok"); 645 err = lzc_ioctl(ZFS_IOC_SEND_SPACE, snapname, args, &result); 646 nvlist_free(args); 647 if (err == 0) 648 *spacep = fnvlist_lookup_uint64(result, "space"); 649 nvlist_free(result); 650 return (err); 651 } 652 653 static int 654 recv_read(int fd, void *buf, int ilen) 655 { 656 char *cp = buf; 657 int rv; 658 int len = ilen; 659 660 do { 661 rv = read(fd, cp, len); 662 cp += rv; 663 len -= rv; 664 } while (rv > 0); 665 666 if (rv < 0 || len != 0) 667 return (EIO); 668 669 return (0); 670 } 671 672 static int 673 recv_impl(const char *snapname, nvlist_t *recvdprops, nvlist_t *localprops, 674 uint8_t *wkeydata, uint_t wkeylen, const char *origin, boolean_t force, 675 boolean_t resumable, boolean_t raw, int input_fd, 676 const dmu_replay_record_t *begin_record, int cleanup_fd, 677 uint64_t *read_bytes, uint64_t *errflags, uint64_t *action_handle, 678 nvlist_t **errors) 679 { 680 681 /* 682 * The receive ioctl is still legacy, so we need to construct our own 683 * zfs_cmd_t rather than using zfsc_ioctl(). 684 */ 685 zfs_cmd_t zc = { 0 }; 686 char *packed = NULL; 687 size_t size; 688 689 dmu_replay_record_t drr; 690 char fsname[MAXPATHLEN]; 691 char *atp; 692 int error; 693 694 ASSERT3S(g_refcount, >, 0); 695 VERIFY3S(g_fd, !=, -1); 696 697 /* Set 'fsname' to the name of containing filesystem */ 698 (void) strlcpy(fsname, snapname, sizeof (fsname)); 699 atp = strchr(fsname, '@'); 700 if (atp == NULL) 701 return (EINVAL); 702 *atp = '\0'; 703 704 /* if the fs does not exist, try its parent. */ 705 if (!lzc_exists(fsname)) { 706 char *slashp = strrchr(fsname, '/'); 707 if (slashp == NULL) 708 return (ENOENT); 709 *slashp = '\0'; 710 } 711 712 /* 713 * The begin_record is normally a non-byteswapped BEGIN record. 714 * For resumable streams it may be set to any non-byteswapped 715 * dmu_replay_record_t. 716 */ 717 if (begin_record == NULL) { 718 error = recv_read(input_fd, &drr, sizeof (drr)); 719 if (error != 0) 720 return (error); 721 } else { 722 drr = *begin_record; 723 } 724 725 (void) strlcpy(zc.zc_name, fsname, sizeof (zc.zc_name)); 726 (void) strlcpy(zc.zc_value, snapname, sizeof (zc.zc_value)); 727 728 if (recvdprops != NULL) { 729 packed = fnvlist_pack(recvdprops, &size); 730 zc.zc_nvlist_src = (uint64_t)(uintptr_t)packed; 731 zc.zc_nvlist_src_size = size; 732 } 733 734 if (localprops != NULL) { 735 packed = fnvlist_pack(localprops, &size); 736 zc.zc_nvlist_conf = (uint64_t)(uintptr_t)packed; 737 zc.zc_nvlist_conf_size = size; 738 } 739 740 /* Use zc_history_ members for hidden args */ 741 if (wkeydata != NULL) { 742 nvlist_t *hidden_args = fnvlist_alloc(); 743 fnvlist_add_uint8_array(hidden_args, "wkeydata", wkeydata, 744 wkeylen); 745 packed = fnvlist_pack(hidden_args, &size); 746 zc.zc_history_offset = (uint64_t)(uintptr_t)packed; 747 zc.zc_history_len = size; 748 } 749 750 if (origin != NULL) 751 (void) strlcpy(zc.zc_string, origin, sizeof (zc.zc_string)); 752 753 ASSERT3S(drr.drr_type, ==, DRR_BEGIN); 754 zc.zc_begin_record = drr; 755 zc.zc_guid = force; 756 zc.zc_cookie = input_fd; 757 zc.zc_cleanup_fd = -1; 758 zc.zc_action_handle = 0; 759 zc.zc_resumable = resumable; 760 761 if (cleanup_fd >= 0) 762 zc.zc_cleanup_fd = cleanup_fd; 763 764 if (action_handle != NULL) 765 zc.zc_action_handle = *action_handle; 766 767 zc.zc_nvlist_dst_size = 128 * 1024; 768 zc.zc_nvlist_dst = (uint64_t)(uintptr_t)malloc(zc.zc_nvlist_dst_size); 769 770 error = ioctl(g_fd, ZFS_IOC_RECV, &zc); 771 if (error != 0) { 772 error = errno; 773 } else { 774 if (read_bytes != NULL) 775 *read_bytes = zc.zc_cookie; 776 777 if (errflags != NULL) 778 *errflags = zc.zc_obj; 779 780 if (action_handle != NULL) 781 *action_handle = zc.zc_action_handle; 782 783 if (errors != NULL) 784 VERIFY0(nvlist_unpack( 785 (void *)(uintptr_t)zc.zc_nvlist_dst, 786 zc.zc_nvlist_dst_size, errors, KM_SLEEP)); 787 } 788 789 if (packed != NULL) 790 fnvlist_pack_free(packed, size); 791 free((void*)(uintptr_t)zc.zc_nvlist_dst); 792 793 return (error); 794 } 795 796 /* 797 * The simplest receive case: receive from the specified fd, creating the 798 * specified snapshot. Apply the specified properties as "received" properties 799 * (which can be overridden by locally-set properties). If the stream is a 800 * clone, its origin snapshot must be specified by 'origin'. The 'force' 801 * flag will cause the target filesystem to be rolled back or destroyed if 802 * necessary to receive. 803 * 804 * Return 0 on success or an errno on failure. 805 * 806 * Note: this interface does not work on dedup'd streams 807 * (those with DMU_BACKUP_FEATURE_DEDUP). 808 */ 809 int 810 lzc_receive(const char *snapname, nvlist_t *props, const char *origin, 811 boolean_t raw, boolean_t force, int fd) 812 { 813 return (recv_impl(snapname, props, NULL, NULL, 0, origin, force, 814 B_FALSE, raw, fd, NULL, -1, NULL, NULL, NULL, NULL)); 815 } 816 817 /* 818 * Like lzc_receive, but if the receive fails due to premature stream 819 * termination, the intermediate state will be preserved on disk. In this 820 * case, ECKSUM will be returned. The receive may subsequently be resumed 821 * with a resuming send stream generated by lzc_send_resume(). 822 */ 823 int 824 lzc_receive_resumable(const char *snapname, nvlist_t *props, const char *origin, 825 boolean_t force, boolean_t raw, int fd) 826 { 827 return (recv_impl(snapname, props, NULL, NULL, 0, origin, force, 828 B_TRUE, raw, fd, NULL, -1, NULL, NULL, NULL, NULL)); 829 } 830 831 /* 832 * Like lzc_receive, but allows the caller to read the begin record and then to 833 * pass it in. That could be useful if the caller wants to derive, for example, 834 * the snapname or the origin parameters based on the information contained in 835 * the begin record. 836 * The begin record must be in its original form as read from the stream, 837 * in other words, it should not be byteswapped. 838 * 839 * The 'resumable' parameter allows to obtain the same behavior as with 840 * lzc_receive_resumable. 841 */ 842 int 843 lzc_receive_with_header(const char *snapname, nvlist_t *props, 844 const char *origin, boolean_t force, boolean_t resumable, boolean_t raw, 845 int fd, const dmu_replay_record_t *begin_record) 846 { 847 if (begin_record == NULL) 848 return (EINVAL); 849 850 return (recv_impl(snapname, props, NULL, NULL, 0, origin, force, 851 resumable, raw, fd, begin_record, -1, NULL, NULL, NULL, NULL)); 852 } 853 854 /* 855 * Allows the caller to pass an additional 'cmdprops' argument. 856 * 857 * The 'cmdprops' nvlist contains both override ('zfs receive -o') and 858 * exclude ('zfs receive -x') properties. Callers are responsible for freeing 859 * this nvlist 860 */ 861 int lzc_receive_with_cmdprops(const char *snapname, nvlist_t *props, 862 nvlist_t *cmdprops, uint8_t *wkeydata, uint_t wkeylen, const char *origin, 863 boolean_t force, boolean_t resumable, boolean_t raw, int input_fd, 864 const dmu_replay_record_t *begin_record, int cleanup_fd, 865 uint64_t *read_bytes, uint64_t *errflags, uint64_t *action_handle, 866 nvlist_t **errors) 867 { 868 return (recv_impl(snapname, props, cmdprops, wkeydata, wkeylen, origin, 869 force, resumable, raw, input_fd, begin_record, cleanup_fd, 870 read_bytes, errflags, action_handle, errors)); 871 } 872 873 /* 874 * Roll back this filesystem or volume to its most recent snapshot. 875 * If snapnamebuf is not NULL, it will be filled in with the name 876 * of the most recent snapshot. 877 * Note that the latest snapshot may change if a new one is concurrently 878 * created or the current one is destroyed. lzc_rollback_to can be used 879 * to roll back to a specific latest snapshot. 880 * 881 * Return 0 on success or an errno on failure. 882 */ 883 int 884 lzc_rollback(const char *fsname, char *snapnamebuf, int snapnamelen) 885 { 886 nvlist_t *args; 887 nvlist_t *result; 888 int err; 889 890 args = fnvlist_alloc(); 891 err = lzc_ioctl(ZFS_IOC_ROLLBACK, fsname, args, &result); 892 nvlist_free(args); 893 if (err == 0 && snapnamebuf != NULL) { 894 const char *snapname = fnvlist_lookup_string(result, "target"); 895 (void) strlcpy(snapnamebuf, snapname, snapnamelen); 896 } 897 nvlist_free(result); 898 899 return (err); 900 } 901 902 /* 903 * Roll back this filesystem or volume to the specified snapshot, 904 * if possible. 905 * 906 * Return 0 on success or an errno on failure. 907 */ 908 int 909 lzc_rollback_to(const char *fsname, const char *snapname) 910 { 911 nvlist_t *args; 912 nvlist_t *result; 913 int err; 914 915 args = fnvlist_alloc(); 916 fnvlist_add_string(args, "target", snapname); 917 err = lzc_ioctl(ZFS_IOC_ROLLBACK, fsname, args, &result); 918 nvlist_free(args); 919 nvlist_free(result); 920 return (err); 921 } 922 923 /* 924 * Creates bookmarks. 925 * 926 * The bookmarks nvlist maps from name of the bookmark (e.g. "pool/fs#bmark") to 927 * the name of the snapshot (e.g. "pool/fs@snap"). All the bookmarks and 928 * snapshots must be in the same pool. 929 * 930 * The returned results nvlist will have an entry for each bookmark that failed. 931 * The value will be the (int32) error code. 932 * 933 * The return value will be 0 if all bookmarks were created, otherwise it will 934 * be the errno of a (undetermined) bookmarks that failed. 935 */ 936 int 937 lzc_bookmark(nvlist_t *bookmarks, nvlist_t **errlist) 938 { 939 nvpair_t *elem; 940 int error; 941 char pool[ZFS_MAX_DATASET_NAME_LEN]; 942 943 /* determine the pool name */ 944 elem = nvlist_next_nvpair(bookmarks, NULL); 945 if (elem == NULL) 946 return (0); 947 (void) strlcpy(pool, nvpair_name(elem), sizeof (pool)); 948 pool[strcspn(pool, "/#")] = '\0'; 949 950 error = lzc_ioctl(ZFS_IOC_BOOKMARK, pool, bookmarks, errlist); 951 952 return (error); 953 } 954 955 /* 956 * Retrieve bookmarks. 957 * 958 * Retrieve the list of bookmarks for the given file system. The props 959 * parameter is an nvlist of property names (with no values) that will be 960 * returned for each bookmark. 961 * 962 * The following are valid properties on bookmarks, all of which are numbers 963 * (represented as uint64 in the nvlist) 964 * 965 * "guid" - globally unique identifier of the snapshot it refers to 966 * "createtxg" - txg when the snapshot it refers to was created 967 * "creation" - timestamp when the snapshot it refers to was created 968 * "ivsetguid" - IVset guid for identifying encrypted snapshots 969 * 970 * The format of the returned nvlist as follows: 971 * <short name of bookmark> -> { 972 * <name of property> -> { 973 * "value" -> uint64 974 * } 975 * } 976 */ 977 int 978 lzc_get_bookmarks(const char *fsname, nvlist_t *props, nvlist_t **bmarks) 979 { 980 return (lzc_ioctl(ZFS_IOC_GET_BOOKMARKS, fsname, props, bmarks)); 981 } 982 983 /* 984 * Destroys bookmarks. 985 * 986 * The keys in the bmarks nvlist are the bookmarks to be destroyed. 987 * They must all be in the same pool. Bookmarks are specified as 988 * <fs>#<bmark>. 989 * 990 * Bookmarks that do not exist will be silently ignored. 991 * 992 * The return value will be 0 if all bookmarks that existed were destroyed. 993 * 994 * Otherwise the return value will be the errno of a (undetermined) bookmark 995 * that failed, no bookmarks will be destroyed, and the errlist will have an 996 * entry for each bookmarks that failed. The value in the errlist will be 997 * the (int32) error code. 998 */ 999 int 1000 lzc_destroy_bookmarks(nvlist_t *bmarks, nvlist_t **errlist) 1001 { 1002 nvpair_t *elem; 1003 int error; 1004 char pool[ZFS_MAX_DATASET_NAME_LEN]; 1005 1006 /* determine the pool name */ 1007 elem = nvlist_next_nvpair(bmarks, NULL); 1008 if (elem == NULL) 1009 return (0); 1010 (void) strlcpy(pool, nvpair_name(elem), sizeof (pool)); 1011 pool[strcspn(pool, "/#")] = '\0'; 1012 1013 error = lzc_ioctl(ZFS_IOC_DESTROY_BOOKMARKS, pool, bmarks, errlist); 1014 1015 return (error); 1016 } 1017 1018 static int 1019 lzc_channel_program_impl(const char *pool, const char *program, boolean_t sync, 1020 uint64_t instrlimit, uint64_t memlimit, nvlist_t *argnvl, nvlist_t **outnvl) 1021 { 1022 int error; 1023 nvlist_t *args; 1024 1025 args = fnvlist_alloc(); 1026 fnvlist_add_string(args, ZCP_ARG_PROGRAM, program); 1027 fnvlist_add_nvlist(args, ZCP_ARG_ARGLIST, argnvl); 1028 fnvlist_add_boolean_value(args, ZCP_ARG_SYNC, sync); 1029 fnvlist_add_uint64(args, ZCP_ARG_INSTRLIMIT, instrlimit); 1030 fnvlist_add_uint64(args, ZCP_ARG_MEMLIMIT, memlimit); 1031 error = lzc_ioctl(ZFS_IOC_CHANNEL_PROGRAM, pool, args, outnvl); 1032 fnvlist_free(args); 1033 1034 return (error); 1035 } 1036 1037 /* 1038 * Executes a channel program. 1039 * 1040 * If this function returns 0 the channel program was successfully loaded and 1041 * ran without failing. Note that individual commands the channel program ran 1042 * may have failed and the channel program is responsible for reporting such 1043 * errors through outnvl if they are important. 1044 * 1045 * This method may also return: 1046 * 1047 * EINVAL The program contains syntax errors, or an invalid memory or time 1048 * limit was given. No part of the channel program was executed. 1049 * If caused by syntax errors, 'outnvl' contains information about the 1050 * errors. 1051 * 1052 * ECHRNG The program was executed, but encountered a runtime error, such as 1053 * calling a function with incorrect arguments, invoking the error() 1054 * function directly, failing an assert() command, etc. Some portion 1055 * of the channel program may have executed and committed changes. 1056 * Information about the failure can be found in 'outnvl'. 1057 * 1058 * ENOMEM The program fully executed, but the output buffer was not large 1059 * enough to store the returned value. No output is returned through 1060 * 'outnvl'. 1061 * 1062 * ENOSPC The program was terminated because it exceeded its memory usage 1063 * limit. Some portion of the channel program may have executed and 1064 * committed changes to disk. No output is returned through 'outnvl'. 1065 * 1066 * ETIME The program was terminated because it exceeded its Lua instruction 1067 * limit. Some portion of the channel program may have executed and 1068 * committed changes to disk. No output is returned through 'outnvl'. 1069 */ 1070 int 1071 lzc_channel_program(const char *pool, const char *program, uint64_t instrlimit, 1072 uint64_t memlimit, nvlist_t *argnvl, nvlist_t **outnvl) 1073 { 1074 return (lzc_channel_program_impl(pool, program, B_TRUE, instrlimit, 1075 memlimit, argnvl, outnvl)); 1076 } 1077 1078 /* 1079 * Creates a checkpoint for the specified pool. 1080 * 1081 * If this function returns 0 the pool was successfully checkpointed. 1082 * 1083 * This method may also return: 1084 * 1085 * ZFS_ERR_CHECKPOINT_EXISTS 1086 * The pool already has a checkpoint. A pools can only have one 1087 * checkpoint at most, at any given time. 1088 * 1089 * ZFS_ERR_DISCARDING_CHECKPOINT 1090 * ZFS is in the middle of discarding a checkpoint for this pool. 1091 * The pool can be checkpointed again once the discard is done. 1092 * 1093 * ZFS_DEVRM_IN_PROGRESS 1094 * A vdev is currently being removed. The pool cannot be 1095 * checkpointed until the device removal is done. 1096 * 1097 * ZFS_VDEV_TOO_BIG 1098 * One or more top-level vdevs exceed the maximum vdev size 1099 * supported for this feature. 1100 */ 1101 int 1102 lzc_pool_checkpoint(const char *pool) 1103 { 1104 int error; 1105 1106 nvlist_t *result = NULL; 1107 nvlist_t *args = fnvlist_alloc(); 1108 1109 error = lzc_ioctl(ZFS_IOC_POOL_CHECKPOINT, pool, args, &result); 1110 1111 fnvlist_free(args); 1112 fnvlist_free(result); 1113 1114 return (error); 1115 } 1116 1117 /* 1118 * Discard the checkpoint from the specified pool. 1119 * 1120 * If this function returns 0 the checkpoint was successfully discarded. 1121 * 1122 * This method may also return: 1123 * 1124 * ZFS_ERR_NO_CHECKPOINT 1125 * The pool does not have a checkpoint. 1126 * 1127 * ZFS_ERR_DISCARDING_CHECKPOINT 1128 * ZFS is already in the middle of discarding the checkpoint. 1129 */ 1130 int 1131 lzc_pool_checkpoint_discard(const char *pool) 1132 { 1133 int error; 1134 1135 nvlist_t *result = NULL; 1136 nvlist_t *args = fnvlist_alloc(); 1137 1138 error = lzc_ioctl(ZFS_IOC_POOL_DISCARD_CHECKPOINT, pool, args, &result); 1139 1140 fnvlist_free(args); 1141 fnvlist_free(result); 1142 1143 return (error); 1144 } 1145 1146 /* 1147 * Executes a read-only channel program. 1148 * 1149 * A read-only channel program works programmatically the same way as a 1150 * normal channel program executed with lzc_channel_program(). The only 1151 * difference is it runs exclusively in open-context and therefore can 1152 * return faster. The downside to that, is that the program cannot change 1153 * on-disk state by calling functions from the zfs.sync submodule. 1154 * 1155 * The return values of this function (and their meaning) are exactly the 1156 * same as the ones described in lzc_channel_program(). 1157 */ 1158 int 1159 lzc_channel_program_nosync(const char *pool, const char *program, 1160 uint64_t timeout, uint64_t memlimit, nvlist_t *argnvl, nvlist_t **outnvl) 1161 { 1162 return (lzc_channel_program_impl(pool, program, B_FALSE, timeout, 1163 memlimit, argnvl, outnvl)); 1164 } 1165 1166 /* 1167 * Changes initializing state. 1168 * 1169 * vdevs should be a list of (<key>, guid) where guid is a uint64 vdev GUID. 1170 * The key is ignored. 1171 * 1172 * If there are errors related to vdev arguments, per-vdev errors are returned 1173 * in an nvlist with the key "vdevs". Each error is a (guid, errno) pair where 1174 * guid is stringified with PRIu64, and errno is one of the following as 1175 * an int64_t: 1176 * - ENODEV if the device was not found 1177 * - EINVAL if the devices is not a leaf or is not concrete (e.g. missing) 1178 * - EROFS if the device is not writeable 1179 * - EBUSY start requested but the device is already being either 1180 * initialized or trimmed 1181 * - ESRCH cancel/suspend requested but device is not being initialized 1182 * 1183 * If the errlist is empty, then return value will be: 1184 * - EINVAL if one or more arguments was invalid 1185 * - Other spa_open failures 1186 * - 0 if the operation succeeded 1187 */ 1188 int 1189 lzc_initialize(const char *poolname, pool_initialize_func_t cmd_type, 1190 nvlist_t *vdevs, nvlist_t **errlist) 1191 { 1192 int error; 1193 1194 nvlist_t *args = fnvlist_alloc(); 1195 fnvlist_add_uint64(args, ZPOOL_INITIALIZE_COMMAND, (uint64_t)cmd_type); 1196 fnvlist_add_nvlist(args, ZPOOL_INITIALIZE_VDEVS, vdevs); 1197 1198 error = lzc_ioctl(ZFS_IOC_POOL_INITIALIZE, poolname, args, errlist); 1199 1200 fnvlist_free(args); 1201 1202 return (error); 1203 } 1204 1205 /* 1206 * Changes TRIM state. 1207 * 1208 * vdevs should be a list of (<key>, guid) where guid is a uint64 vdev GUID. 1209 * The key is ignored. 1210 * 1211 * If there are errors related to vdev arguments, per-vdev errors are returned 1212 * in an nvlist with the key "vdevs". Each error is a (guid, errno) pair where 1213 * guid is stringified with PRIu64, and errno is one of the following as 1214 * an int64_t: 1215 * - ENODEV if the device was not found 1216 * - EINVAL if the devices is not a leaf or is not concrete (e.g. missing) 1217 * - EROFS if the device is not writeable 1218 * - EBUSY start requested but the device is already being either trimmed 1219 * or initialized 1220 * - ESRCH cancel/suspend requested but device is not being initialized 1221 * - EOPNOTSUPP if the device does not support TRIM (or secure TRIM) 1222 * 1223 * If the errlist is empty, then return value will be: 1224 * - EINVAL if one or more arguments was invalid 1225 * - Other spa_open failures 1226 * - 0 if the operation succeeded 1227 */ 1228 int 1229 lzc_trim(const char *poolname, pool_trim_func_t cmd_type, uint64_t rate, 1230 boolean_t secure, nvlist_t *vdevs, nvlist_t **errlist) 1231 { 1232 int error; 1233 1234 nvlist_t *args = fnvlist_alloc(); 1235 fnvlist_add_uint64(args, ZPOOL_TRIM_COMMAND, (uint64_t)cmd_type); 1236 fnvlist_add_nvlist(args, ZPOOL_TRIM_VDEVS, vdevs); 1237 fnvlist_add_uint64(args, ZPOOL_TRIM_RATE, rate); 1238 fnvlist_add_boolean_value(args, ZPOOL_TRIM_SECURE, secure); 1239 1240 error = lzc_ioctl(ZFS_IOC_POOL_TRIM, poolname, args, errlist); 1241 1242 fnvlist_free(args); 1243 1244 return (error); 1245 } 1246 1247 /* 1248 * Performs key management functions 1249 * 1250 * crypto_cmd should be a value from zfs_ioc_crypto_cmd_t. If the command 1251 * specifies to load or change a wrapping key, the key should be specified in 1252 * the hidden_args nvlist so that it is not logged 1253 */ 1254 int 1255 lzc_load_key(const char *fsname, boolean_t noop, uint8_t *wkeydata, 1256 uint_t wkeylen) 1257 { 1258 int error; 1259 nvlist_t *ioc_args; 1260 nvlist_t *hidden_args; 1261 1262 if (wkeydata == NULL) 1263 return (EINVAL); 1264 1265 ioc_args = fnvlist_alloc(); 1266 hidden_args = fnvlist_alloc(); 1267 fnvlist_add_uint8_array(hidden_args, "wkeydata", wkeydata, wkeylen); 1268 fnvlist_add_nvlist(ioc_args, ZPOOL_HIDDEN_ARGS, hidden_args); 1269 if (noop) 1270 fnvlist_add_boolean(ioc_args, "noop"); 1271 error = lzc_ioctl(ZFS_IOC_LOAD_KEY, fsname, ioc_args, NULL); 1272 nvlist_free(hidden_args); 1273 nvlist_free(ioc_args); 1274 1275 return (error); 1276 } 1277 1278 int 1279 lzc_unload_key(const char *fsname) 1280 { 1281 return (lzc_ioctl(ZFS_IOC_UNLOAD_KEY, fsname, NULL, NULL)); 1282 } 1283 1284 int 1285 lzc_change_key(const char *fsname, uint64_t crypt_cmd, nvlist_t *props, 1286 uint8_t *wkeydata, uint_t wkeylen) 1287 { 1288 int error; 1289 nvlist_t *ioc_args = fnvlist_alloc(); 1290 nvlist_t *hidden_args = NULL; 1291 1292 fnvlist_add_uint64(ioc_args, "crypt_cmd", crypt_cmd); 1293 1294 if (wkeydata != NULL) { 1295 hidden_args = fnvlist_alloc(); 1296 fnvlist_add_uint8_array(hidden_args, "wkeydata", wkeydata, 1297 wkeylen); 1298 fnvlist_add_nvlist(ioc_args, ZPOOL_HIDDEN_ARGS, hidden_args); 1299 } 1300 1301 if (props != NULL) 1302 fnvlist_add_nvlist(ioc_args, "props", props); 1303 1304 error = lzc_ioctl(ZFS_IOC_CHANGE_KEY, fsname, ioc_args, NULL); 1305 nvlist_free(hidden_args); 1306 nvlist_free(ioc_args); 1307 return (error); 1308 } 1309