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.
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.
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]
23 * Copyright (c) 2012, 2017 by Delphix. All rights reserved.
24 * Copyright (c) 2013 Steven Hartland. All rights reserved.
25 * Copyright (c) 2017 Datto Inc.
26 * Copyright 2017 RackTop Systems.
27 * Copyright (c) 2017 Open-E, Inc. All Rights Reserved.
31 * LibZFS_Core (lzc) is intended to replace most functionality in libzfs.
32 * It has the following characteristics:
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).
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.
50 * - Programmatic Error Handling. libzfs_core communicates errors with
51 * defined error numbers, and doesn't print anything to stdout/stderr.
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.
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.
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.
76 #include <libzfs_core.h>
84 #include <sys/nvpair.h>
85 #include <sys/param.h>
86 #include <sys/types.h>
88 #include <sys/zfs_ioctl.h>
91 static pthread_mutex_t g_lock
= PTHREAD_MUTEX_INITIALIZER
;
92 static int g_refcount
;
95 libzfs_core_init(void)
97 (void) pthread_mutex_lock(&g_lock
);
98 if (g_refcount
== 0) {
99 g_fd
= open("/dev/zfs", O_RDWR
);
101 (void) pthread_mutex_unlock(&g_lock
);
106 (void) pthread_mutex_unlock(&g_lock
);
111 libzfs_core_fini(void)
113 (void) pthread_mutex_lock(&g_lock
);
114 ASSERT3S(g_refcount
, >, 0);
119 if (g_refcount
== 0 && g_fd
!= -1) {
123 (void) pthread_mutex_unlock(&g_lock
);
127 lzc_ioctl(zfs_ioc_t ioc
, const char *name
,
128 nvlist_t
*source
, nvlist_t
**resultp
)
130 zfs_cmd_t zc
= {"\0"};
135 ASSERT3S(g_refcount
, >, 0);
136 VERIFY3S(g_fd
, !=, -1);
139 (void) strlcpy(zc
.zc_name
, name
, sizeof (zc
.zc_name
));
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
;
147 if (resultp
!= NULL
) {
149 if (ioc
== ZFS_IOC_CHANNEL_PROGRAM
) {
150 zc
.zc_nvlist_dst_size
= fnvlist_lookup_uint64(source
,
153 zc
.zc_nvlist_dst_size
= MAX(size
* 2, 128 * 1024);
155 zc
.zc_nvlist_dst
= (uint64_t)(uintptr_t)
156 malloc(zc
.zc_nvlist_dst_size
);
157 if (zc
.zc_nvlist_dst
== (uint64_t)0) {
163 while (ioctl(g_fd
, ioc
, &zc
) != 0) {
165 * If ioctl exited with ENOMEM, we retry the ioctl after
166 * increasing the size of the destination nvlist.
168 * Channel programs that exit with ENOMEM ran over the
169 * lua memory sandbox; they should not be retried.
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
== (uint64_t)0) {
186 if (zc
.zc_nvlist_dst_filled
) {
187 *resultp
= fnvlist_unpack((void *)(uintptr_t)zc
.zc_nvlist_dst
,
188 zc
.zc_nvlist_dst_size
);
193 fnvlist_pack_free(packed
, size
);
194 free((void *)(uintptr_t)zc
.zc_nvlist_dst
);
199 lzc_create(const char *fsname
, enum lzc_dataset_type type
, nvlist_t
*props
,
200 uint8_t *wkeydata
, uint_t wkeylen
)
203 nvlist_t
*hidden_args
= NULL
;
204 nvlist_t
*args
= fnvlist_alloc();
206 fnvlist_add_int32(args
, "type", (dmu_objset_type_t
)type
);
208 fnvlist_add_nvlist(args
, "props", props
);
210 if (wkeydata
!= NULL
) {
211 hidden_args
= fnvlist_alloc();
212 fnvlist_add_uint8_array(hidden_args
, "wkeydata", wkeydata
,
214 fnvlist_add_nvlist(args
, ZPOOL_HIDDEN_ARGS
, hidden_args
);
217 error
= lzc_ioctl(ZFS_IOC_CREATE
, fsname
, args
, NULL
);
218 nvlist_free(hidden_args
);
224 lzc_clone(const char *fsname
, const char *origin
, nvlist_t
*props
)
227 nvlist_t
*hidden_args
= NULL
;
228 nvlist_t
*args
= fnvlist_alloc();
230 fnvlist_add_string(args
, "origin", origin
);
232 fnvlist_add_nvlist(args
, "props", props
);
233 error
= lzc_ioctl(ZFS_IOC_CLONE
, fsname
, args
, NULL
);
234 nvlist_free(hidden_args
);
240 lzc_promote(const char *fsname
, char *snapnamebuf
, int snapnamelen
)
243 * The promote ioctl is still legacy, so we need to construct our
244 * own zfs_cmd_t rather than using lzc_ioctl().
246 zfs_cmd_t zc
= { "\0" };
248 ASSERT3S(g_refcount
, >, 0);
249 VERIFY3S(g_fd
, !=, -1);
251 (void) strlcpy(zc
.zc_name
, fsname
, sizeof (zc
.zc_name
));
252 if (ioctl(g_fd
, ZFS_IOC_PROMOTE
, &zc
) != 0) {
254 if (error
== EEXIST
&& snapnamebuf
!= NULL
)
255 (void) strlcpy(snapnamebuf
, zc
.zc_string
, snapnamelen
);
264 * The keys in the snaps nvlist are the snapshots to be created.
265 * They must all be in the same pool.
267 * The props nvlist is properties to set. Currently only user properties
268 * are supported. { user:prop_name -> string value }
270 * The returned results nvlist will have an entry for each snapshot that failed.
271 * The value will be the (int32) error code.
273 * The return value will be 0 if all snapshots were created, otherwise it will
274 * be the errno of a (unspecified) snapshot that failed.
277 lzc_snapshot(nvlist_t
*snaps
, nvlist_t
*props
, nvlist_t
**errlist
)
282 char pool
[ZFS_MAX_DATASET_NAME_LEN
];
286 /* determine the pool name */
287 elem
= nvlist_next_nvpair(snaps
, NULL
);
290 (void) strlcpy(pool
, nvpair_name(elem
), sizeof (pool
));
291 pool
[strcspn(pool
, "/@")] = '\0';
293 args
= fnvlist_alloc();
294 fnvlist_add_nvlist(args
, "snaps", snaps
);
296 fnvlist_add_nvlist(args
, "props", props
);
298 error
= lzc_ioctl(ZFS_IOC_SNAPSHOT
, pool
, args
, errlist
);
305 * Destroys snapshots.
307 * The keys in the snaps nvlist are the snapshots to be destroyed.
308 * They must all be in the same pool.
310 * Snapshots that do not exist will be silently ignored.
312 * If 'defer' is not set, and a snapshot has user holds or clones, the
313 * destroy operation will fail and none of the snapshots will be
316 * If 'defer' is set, and a snapshot has user holds or clones, it will be
317 * marked for deferred destruction, and will be destroyed when the last hold
318 * or clone is removed/destroyed.
320 * The return value will be 0 if all snapshots were destroyed (or marked for
321 * later destruction if 'defer' is set) or didn't exist to begin with.
323 * Otherwise the return value will be the errno of a (unspecified) snapshot
324 * that failed, no snapshots will be destroyed, and the errlist will have an
325 * entry for each snapshot that failed. The value in the errlist will be
326 * the (int32) error code.
329 lzc_destroy_snaps(nvlist_t
*snaps
, boolean_t defer
, nvlist_t
**errlist
)
334 char pool
[ZFS_MAX_DATASET_NAME_LEN
];
336 /* determine the pool name */
337 elem
= nvlist_next_nvpair(snaps
, NULL
);
340 (void) strlcpy(pool
, nvpair_name(elem
), sizeof (pool
));
341 pool
[strcspn(pool
, "/@")] = '\0';
343 args
= fnvlist_alloc();
344 fnvlist_add_nvlist(args
, "snaps", snaps
);
346 fnvlist_add_boolean(args
, "defer");
348 error
= lzc_ioctl(ZFS_IOC_DESTROY_SNAPS
, pool
, args
, errlist
);
355 lzc_snaprange_space(const char *firstsnap
, const char *lastsnap
,
361 char fs
[ZFS_MAX_DATASET_NAME_LEN
];
364 /* determine the fs name */
365 (void) strlcpy(fs
, firstsnap
, sizeof (fs
));
366 atp
= strchr(fs
, '@');
371 args
= fnvlist_alloc();
372 fnvlist_add_string(args
, "firstsnap", firstsnap
);
374 err
= lzc_ioctl(ZFS_IOC_SPACE_SNAPS
, lastsnap
, args
, &result
);
377 *usedp
= fnvlist_lookup_uint64(result
, "used");
378 fnvlist_free(result
);
384 lzc_exists(const char *dataset
)
387 * The objset_stats ioctl is still legacy, so we need to construct our
388 * own zfs_cmd_t rather than using lzc_ioctl().
390 zfs_cmd_t zc
= {"\0"};
392 ASSERT3S(g_refcount
, >, 0);
393 VERIFY3S(g_fd
, !=, -1);
395 (void) strlcpy(zc
.zc_name
, dataset
, sizeof (zc
.zc_name
));
396 return (ioctl(g_fd
, ZFS_IOC_OBJSET_STATS
, &zc
) == 0);
401 * It was added to preserve the function signature in case it is
402 * needed in the future.
406 lzc_sync(const char *pool_name
, nvlist_t
*innvl
, nvlist_t
**outnvl
)
408 return (lzc_ioctl(ZFS_IOC_POOL_SYNC
, pool_name
, innvl
, NULL
));
412 * Create "user holds" on snapshots. If there is a hold on a snapshot,
413 * the snapshot can not be destroyed. (However, it can be marked for deletion
414 * by lzc_destroy_snaps(defer=B_TRUE).)
416 * The keys in the nvlist are snapshot names.
417 * The snapshots must all be in the same pool.
418 * The value is the name of the hold (string type).
420 * If cleanup_fd is not -1, it must be the result of open("/dev/zfs", O_EXCL).
421 * In this case, when the cleanup_fd is closed (including on process
422 * termination), the holds will be released. If the system is shut down
423 * uncleanly, the holds will be released when the pool is next opened
426 * Holds for snapshots which don't exist will be skipped and have an entry
427 * added to errlist, but will not cause an overall failure.
429 * The return value will be 0 if all holds, for snapshots that existed,
430 * were successfully created.
432 * Otherwise the return value will be the errno of a (unspecified) hold that
433 * failed and no holds will be created.
435 * In all cases the errlist will have an entry for each hold that failed
436 * (name = snapshot), with its value being the error code (int32).
439 lzc_hold(nvlist_t
*holds
, int cleanup_fd
, nvlist_t
**errlist
)
441 char pool
[ZFS_MAX_DATASET_NAME_LEN
];
446 /* determine the pool name */
447 elem
= nvlist_next_nvpair(holds
, NULL
);
450 (void) strlcpy(pool
, nvpair_name(elem
), sizeof (pool
));
451 pool
[strcspn(pool
, "/@")] = '\0';
453 args
= fnvlist_alloc();
454 fnvlist_add_nvlist(args
, "holds", holds
);
455 if (cleanup_fd
!= -1)
456 fnvlist_add_int32(args
, "cleanup_fd", cleanup_fd
);
458 error
= lzc_ioctl(ZFS_IOC_HOLD
, pool
, args
, errlist
);
464 * Release "user holds" on snapshots. If the snapshot has been marked for
465 * deferred destroy (by lzc_destroy_snaps(defer=B_TRUE)), it does not have
466 * any clones, and all the user holds are removed, then the snapshot will be
469 * The keys in the nvlist are snapshot names.
470 * The snapshots must all be in the same pool.
471 * The value is an nvlist whose keys are the holds to remove.
473 * Holds which failed to release because they didn't exist will have an entry
474 * added to errlist, but will not cause an overall failure.
476 * The return value will be 0 if the nvl holds was empty or all holds that
477 * existed, were successfully removed.
479 * Otherwise the return value will be the errno of a (unspecified) hold that
480 * failed to release and no holds will be released.
482 * In all cases the errlist will have an entry for each hold that failed to
486 lzc_release(nvlist_t
*holds
, nvlist_t
**errlist
)
488 char pool
[ZFS_MAX_DATASET_NAME_LEN
];
491 /* determine the pool name */
492 elem
= nvlist_next_nvpair(holds
, NULL
);
495 (void) strlcpy(pool
, nvpair_name(elem
), sizeof (pool
));
496 pool
[strcspn(pool
, "/@")] = '\0';
498 return (lzc_ioctl(ZFS_IOC_RELEASE
, pool
, holds
, errlist
));
502 * Retrieve list of user holds on the specified snapshot.
504 * On success, *holdsp will be set to an nvlist which the caller must free.
505 * The keys are the names of the holds, and the value is the creation time
506 * of the hold (uint64) in seconds since the epoch.
509 lzc_get_holds(const char *snapname
, nvlist_t
**holdsp
)
511 return (lzc_ioctl(ZFS_IOC_GET_HOLDS
, snapname
, NULL
, holdsp
));
515 * Generate a zfs send stream for the specified snapshot and write it to
516 * the specified file descriptor.
518 * "snapname" is the full name of the snapshot to send (e.g. "pool/fs@snap")
520 * If "from" is NULL, a full (non-incremental) stream will be sent.
521 * If "from" is non-NULL, it must be the full name of a snapshot or
522 * bookmark to send an incremental from (e.g. "pool/fs@earlier_snap" or
523 * "pool/fs#earlier_bmark"). If non-NULL, the specified snapshot or
524 * bookmark must represent an earlier point in the history of "snapname").
525 * It can be an earlier snapshot in the same filesystem or zvol as "snapname",
526 * or it can be the origin of "snapname"'s filesystem, or an earlier
527 * snapshot in the origin, etc.
529 * "fd" is the file descriptor to write the send stream to.
531 * If "flags" contains LZC_SEND_FLAG_LARGE_BLOCK, the stream is permitted
532 * to contain DRR_WRITE records with drr_length > 128K, and DRR_OBJECT
533 * records with drr_blksz > 128K.
535 * If "flags" contains LZC_SEND_FLAG_EMBED_DATA, the stream is permitted
536 * to contain DRR_WRITE_EMBEDDED records with drr_etype==BP_EMBEDDED_TYPE_DATA,
537 * which the receiving system must support (as indicated by support
538 * for the "embedded_data" feature).
541 lzc_send(const char *snapname
, const char *from
, int fd
,
542 enum lzc_send_flags flags
)
544 return (lzc_send_resume(snapname
, from
, fd
, flags
, 0, 0));
548 lzc_send_resume(const char *snapname
, const char *from
, int fd
,
549 enum lzc_send_flags flags
, uint64_t resumeobj
, uint64_t resumeoff
)
554 args
= fnvlist_alloc();
555 fnvlist_add_int32(args
, "fd", fd
);
557 fnvlist_add_string(args
, "fromsnap", from
);
558 if (flags
& LZC_SEND_FLAG_LARGE_BLOCK
)
559 fnvlist_add_boolean(args
, "largeblockok");
560 if (flags
& LZC_SEND_FLAG_EMBED_DATA
)
561 fnvlist_add_boolean(args
, "embedok");
562 if (flags
& LZC_SEND_FLAG_COMPRESS
)
563 fnvlist_add_boolean(args
, "compressok");
564 if (flags
& LZC_SEND_FLAG_RAW
)
565 fnvlist_add_boolean(args
, "rawok");
566 if (resumeobj
!= 0 || resumeoff
!= 0) {
567 fnvlist_add_uint64(args
, "resume_object", resumeobj
);
568 fnvlist_add_uint64(args
, "resume_offset", resumeoff
);
570 err
= lzc_ioctl(ZFS_IOC_SEND_NEW
, snapname
, args
, NULL
);
576 * "from" can be NULL, a snapshot, or a bookmark.
578 * If from is NULL, a full (non-incremental) stream will be estimated. This
579 * is calculated very efficiently.
581 * If from is a snapshot, lzc_send_space uses the deadlists attached to
582 * each snapshot to efficiently estimate the stream size.
584 * If from is a bookmark, the indirect blocks in the destination snapshot
585 * are traversed, looking for blocks with a birth time since the creation TXG of
586 * the snapshot this bookmark was created from. This will result in
587 * significantly more I/O and be less efficient than a send space estimation on
588 * an equivalent snapshot.
591 lzc_send_space(const char *snapname
, const char *from
,
592 enum lzc_send_flags flags
, uint64_t *spacep
)
598 args
= fnvlist_alloc();
600 fnvlist_add_string(args
, "from", from
);
601 if (flags
& LZC_SEND_FLAG_LARGE_BLOCK
)
602 fnvlist_add_boolean(args
, "largeblockok");
603 if (flags
& LZC_SEND_FLAG_EMBED_DATA
)
604 fnvlist_add_boolean(args
, "embedok");
605 if (flags
& LZC_SEND_FLAG_COMPRESS
)
606 fnvlist_add_boolean(args
, "compressok");
607 if (flags
& LZC_SEND_FLAG_RAW
)
608 fnvlist_add_boolean(args
, "rawok");
609 err
= lzc_ioctl(ZFS_IOC_SEND_SPACE
, snapname
, args
, &result
);
612 *spacep
= fnvlist_lookup_uint64(result
, "space");
618 recv_read(int fd
, void *buf
, int ilen
)
625 rv
= read(fd
, cp
, len
);
630 if (rv
< 0 || len
!= 0)
637 * Linux adds ZFS_IOC_RECV_NEW for resumable and raw streams and preserves the
638 * legacy ZFS_IOC_RECV user/kernel interface. The new interface supports all
639 * stream options but is currently only used for resumable streams. This way
640 * updated user space utilities will interoperate with older kernel modules.
642 * Non-Linux OpenZFS platforms have opted to modify the legacy interface.
645 recv_impl(const char *snapname
, nvlist_t
*recvdprops
, nvlist_t
*localprops
,
646 const char *origin
, boolean_t force
, boolean_t resumable
, boolean_t raw
,
647 int input_fd
, const dmu_replay_record_t
*begin_record
, int cleanup_fd
,
648 uint64_t *read_bytes
, uint64_t *errflags
, uint64_t *action_handle
,
651 dmu_replay_record_t drr
;
652 char fsname
[MAXPATHLEN
];
656 ASSERT3S(g_refcount
, >, 0);
657 VERIFY3S(g_fd
, !=, -1);
659 /* Set 'fsname' to the name of containing filesystem */
660 (void) strlcpy(fsname
, snapname
, sizeof (fsname
));
661 atp
= strchr(fsname
, '@');
666 /* If the fs does not exist, try its parent. */
667 if (!lzc_exists(fsname
)) {
668 char *slashp
= strrchr(fsname
, '/');
675 * The begin_record is normally a non-byteswapped BEGIN record.
676 * For resumable streams it may be set to any non-byteswapped
677 * dmu_replay_record_t.
679 if (begin_record
== NULL
) {
680 error
= recv_read(input_fd
, &drr
, sizeof (drr
));
687 if (resumable
|| raw
) {
688 nvlist_t
*outnvl
= NULL
;
689 nvlist_t
*innvl
= fnvlist_alloc();
691 fnvlist_add_string(innvl
, "snapname", snapname
);
693 if (recvdprops
!= NULL
)
694 fnvlist_add_nvlist(innvl
, "props", recvdprops
);
696 if (localprops
!= NULL
)
697 fnvlist_add_nvlist(innvl
, "localprops", localprops
);
699 if (origin
!= NULL
&& strlen(origin
))
700 fnvlist_add_string(innvl
, "origin", origin
);
702 fnvlist_add_byte_array(innvl
, "begin_record",
703 (uchar_t
*)&drr
, sizeof (drr
));
705 fnvlist_add_int32(innvl
, "input_fd", input_fd
);
708 fnvlist_add_boolean(innvl
, "force");
711 fnvlist_add_boolean(innvl
, "resumable");
714 fnvlist_add_int32(innvl
, "cleanup_fd", cleanup_fd
);
716 if (action_handle
!= NULL
)
717 fnvlist_add_uint64(innvl
, "action_handle",
720 error
= lzc_ioctl(ZFS_IOC_RECV_NEW
, fsname
, innvl
, &outnvl
);
722 if (error
== 0 && read_bytes
!= NULL
)
723 error
= nvlist_lookup_uint64(outnvl
, "read_bytes",
726 if (error
== 0 && errflags
!= NULL
)
727 error
= nvlist_lookup_uint64(outnvl
, "error_flags",
730 if (error
== 0 && action_handle
!= NULL
)
731 error
= nvlist_lookup_uint64(outnvl
, "action_handle",
734 if (error
== 0 && errors
!= NULL
) {
736 error
= nvlist_lookup_nvlist(outnvl
, "errors", &nvl
);
738 *errors
= fnvlist_dup(nvl
);
742 fnvlist_free(outnvl
);
744 zfs_cmd_t zc
= {"\0"};
748 ASSERT3S(g_refcount
, >, 0);
750 (void) strlcpy(zc
.zc_name
, fsname
, sizeof (zc
.zc_value
));
751 (void) strlcpy(zc
.zc_value
, snapname
, sizeof (zc
.zc_value
));
753 if (recvdprops
!= NULL
) {
754 packed
= fnvlist_pack(recvdprops
, &size
);
755 zc
.zc_nvlist_src
= (uint64_t)(uintptr_t)packed
;
756 zc
.zc_nvlist_src_size
= size
;
759 if (localprops
!= NULL
) {
760 packed
= fnvlist_pack(localprops
, &size
);
761 zc
.zc_nvlist_conf
= (uint64_t)(uintptr_t)packed
;
762 zc
.zc_nvlist_conf_size
= size
;
766 (void) strlcpy(zc
.zc_string
, origin
,
767 sizeof (zc
.zc_string
));
769 ASSERT3S(drr
.drr_type
, ==, DRR_BEGIN
);
770 zc
.zc_begin_record
= drr
.drr_u
.drr_begin
;
772 zc
.zc_cookie
= input_fd
;
773 zc
.zc_cleanup_fd
= -1;
774 zc
.zc_action_handle
= 0;
777 zc
.zc_cleanup_fd
= cleanup_fd
;
779 if (action_handle
!= NULL
)
780 zc
.zc_action_handle
= *action_handle
;
782 zc
.zc_nvlist_dst_size
= 128 * 1024;
783 zc
.zc_nvlist_dst
= (uint64_t)(uintptr_t)
784 malloc(zc
.zc_nvlist_dst_size
);
786 error
= ioctl(g_fd
, ZFS_IOC_RECV
, &zc
);
790 if (read_bytes
!= NULL
)
791 *read_bytes
= zc
.zc_cookie
;
793 if (errflags
!= NULL
)
794 *errflags
= zc
.zc_obj
;
796 if (action_handle
!= NULL
)
797 *action_handle
= zc
.zc_action_handle
;
800 VERIFY0(nvlist_unpack(
801 (void *)(uintptr_t)zc
.zc_nvlist_dst
,
802 zc
.zc_nvlist_dst_size
, errors
, KM_SLEEP
));
806 fnvlist_pack_free(packed
, size
);
807 free((void *)(uintptr_t)zc
.zc_nvlist_dst
);
814 * The simplest receive case: receive from the specified fd, creating the
815 * specified snapshot. Apply the specified properties as "received" properties
816 * (which can be overridden by locally-set properties). If the stream is a
817 * clone, its origin snapshot must be specified by 'origin'. The 'force'
818 * flag will cause the target filesystem to be rolled back or destroyed if
819 * necessary to receive.
821 * Return 0 on success or an errno on failure.
823 * Note: this interface does not work on dedup'd streams
824 * (those with DMU_BACKUP_FEATURE_DEDUP).
827 lzc_receive(const char *snapname
, nvlist_t
*props
, const char *origin
,
828 boolean_t force
, boolean_t raw
, int fd
)
830 return (recv_impl(snapname
, props
, NULL
, origin
, force
, B_FALSE
, raw
,
831 fd
, NULL
, -1, NULL
, NULL
, NULL
, NULL
));
835 * Like lzc_receive, but if the receive fails due to premature stream
836 * termination, the intermediate state will be preserved on disk. In this
837 * case, ECKSUM will be returned. The receive may subsequently be resumed
838 * with a resuming send stream generated by lzc_send_resume().
841 lzc_receive_resumable(const char *snapname
, nvlist_t
*props
, const char *origin
,
842 boolean_t force
, boolean_t raw
, int fd
)
844 return (recv_impl(snapname
, props
, NULL
, origin
, force
, B_TRUE
, raw
,
845 fd
, NULL
, -1, NULL
, NULL
, NULL
, NULL
));
849 * Like lzc_receive, but allows the caller to read the begin record and then to
850 * pass it in. That could be useful if the caller wants to derive, for example,
851 * the snapname or the origin parameters based on the information contained in
853 * The begin record must be in its original form as read from the stream,
854 * in other words, it should not be byteswapped.
856 * The 'resumable' parameter allows to obtain the same behavior as with
857 * lzc_receive_resumable.
860 lzc_receive_with_header(const char *snapname
, nvlist_t
*props
,
861 const char *origin
, boolean_t force
, boolean_t resumable
, boolean_t raw
,
862 int fd
, const dmu_replay_record_t
*begin_record
)
864 if (begin_record
== NULL
)
867 return (recv_impl(snapname
, props
, NULL
, origin
, force
, resumable
, raw
,
868 fd
, begin_record
, -1, NULL
, NULL
, NULL
, NULL
));
872 * Like lzc_receive, but allows the caller to pass all supported arguments
873 * and retrieve all values returned. The only additional input parameter
874 * is 'cleanup_fd' which is used to set a cleanup-on-exit file descriptor.
876 * The following parameters all provide return values. Several may be set
877 * in the failure case and will contain additional information.
879 * The 'read_bytes' value will be set to the total number of bytes read.
881 * The 'errflags' value will contain zprop_errflags_t flags which are
882 * used to describe any failures.
884 * The 'action_handle' is used to pass the handle for this guid/ds mapping.
885 * It should be set to zero on first call and will contain an updated handle
886 * on success, it should be passed in subsequent calls.
888 * The 'errors' nvlist contains an entry for each unapplied received
889 * property. Callers are responsible for freeing this nvlist.
891 int lzc_receive_one(const char *snapname
, nvlist_t
*props
,
892 const char *origin
, boolean_t force
, boolean_t resumable
, boolean_t raw
,
893 int input_fd
, const dmu_replay_record_t
*begin_record
, int cleanup_fd
,
894 uint64_t *read_bytes
, uint64_t *errflags
, uint64_t *action_handle
,
897 return (recv_impl(snapname
, props
, NULL
, origin
, force
, resumable
,
898 raw
, input_fd
, begin_record
, cleanup_fd
, read_bytes
, errflags
,
899 action_handle
, errors
));
903 * Like lzc_receive_one, but allows the caller to pass an additional 'cmdprops'
906 * The 'cmdprops' nvlist contains both override ('zfs receive -o') and
907 * exclude ('zfs receive -x') properties. Callers are responsible for freeing
910 int lzc_receive_with_cmdprops(const char *snapname
, nvlist_t
*props
,
911 nvlist_t
*cmdprops
, const char *origin
, boolean_t force
,
912 boolean_t resumable
, boolean_t raw
, int input_fd
,
913 const dmu_replay_record_t
*begin_record
, int cleanup_fd
,
914 uint64_t *read_bytes
, uint64_t *errflags
, uint64_t *action_handle
,
917 return (recv_impl(snapname
, props
, cmdprops
, origin
, force
, resumable
,
918 raw
, input_fd
, begin_record
, cleanup_fd
, read_bytes
, errflags
,
919 action_handle
, errors
));
923 * Roll back this filesystem or volume to its most recent snapshot.
924 * If snapnamebuf is not NULL, it will be filled in with the name
925 * of the most recent snapshot.
926 * Note that the latest snapshot may change if a new one is concurrently
927 * created or the current one is destroyed. lzc_rollback_to can be used
928 * to roll back to a specific latest snapshot.
930 * Return 0 on success or an errno on failure.
933 lzc_rollback(const char *fsname
, char *snapnamebuf
, int snapnamelen
)
939 args
= fnvlist_alloc();
940 err
= lzc_ioctl(ZFS_IOC_ROLLBACK
, fsname
, args
, &result
);
942 if (err
== 0 && snapnamebuf
!= NULL
) {
943 const char *snapname
= fnvlist_lookup_string(result
, "target");
944 (void) strlcpy(snapnamebuf
, snapname
, snapnamelen
);
952 * Roll back this filesystem or volume to the specified snapshot,
955 * Return 0 on success or an errno on failure.
958 lzc_rollback_to(const char *fsname
, const char *snapname
)
964 args
= fnvlist_alloc();
965 fnvlist_add_string(args
, "target", snapname
);
966 err
= lzc_ioctl(ZFS_IOC_ROLLBACK
, fsname
, args
, &result
);
975 * The bookmarks nvlist maps from name of the bookmark (e.g. "pool/fs#bmark") to
976 * the name of the snapshot (e.g. "pool/fs@snap"). All the bookmarks and
977 * snapshots must be in the same pool.
979 * The returned results nvlist will have an entry for each bookmark that failed.
980 * The value will be the (int32) error code.
982 * The return value will be 0 if all bookmarks were created, otherwise it will
983 * be the errno of a (undetermined) bookmarks that failed.
986 lzc_bookmark(nvlist_t
*bookmarks
, nvlist_t
**errlist
)
990 char pool
[ZFS_MAX_DATASET_NAME_LEN
];
992 /* determine the pool name */
993 elem
= nvlist_next_nvpair(bookmarks
, NULL
);
996 (void) strlcpy(pool
, nvpair_name(elem
), sizeof (pool
));
997 pool
[strcspn(pool
, "/#")] = '\0';
999 error
= lzc_ioctl(ZFS_IOC_BOOKMARK
, pool
, bookmarks
, errlist
);
1005 * Retrieve bookmarks.
1007 * Retrieve the list of bookmarks for the given file system. The props
1008 * parameter is an nvlist of property names (with no values) that will be
1009 * returned for each bookmark.
1011 * The following are valid properties on bookmarks, all of which are numbers
1012 * (represented as uint64 in the nvlist)
1014 * "guid" - globally unique identifier of the snapshot it refers to
1015 * "createtxg" - txg when the snapshot it refers to was created
1016 * "creation" - timestamp when the snapshot it refers to was created
1018 * The format of the returned nvlist as follows:
1019 * <short name of bookmark> -> {
1020 * <name of property> -> {
1026 lzc_get_bookmarks(const char *fsname
, nvlist_t
*props
, nvlist_t
**bmarks
)
1028 return (lzc_ioctl(ZFS_IOC_GET_BOOKMARKS
, fsname
, props
, bmarks
));
1032 * Destroys bookmarks.
1034 * The keys in the bmarks nvlist are the bookmarks to be destroyed.
1035 * They must all be in the same pool. Bookmarks are specified as
1038 * Bookmarks that do not exist will be silently ignored.
1040 * The return value will be 0 if all bookmarks that existed were destroyed.
1042 * Otherwise the return value will be the errno of a (undetermined) bookmark
1043 * that failed, no bookmarks will be destroyed, and the errlist will have an
1044 * entry for each bookmarks that failed. The value in the errlist will be
1045 * the (int32) error code.
1048 lzc_destroy_bookmarks(nvlist_t
*bmarks
, nvlist_t
**errlist
)
1052 char pool
[ZFS_MAX_DATASET_NAME_LEN
];
1054 /* determine the pool name */
1055 elem
= nvlist_next_nvpair(bmarks
, NULL
);
1058 (void) strlcpy(pool
, nvpair_name(elem
), sizeof (pool
));
1059 pool
[strcspn(pool
, "/#")] = '\0';
1061 error
= lzc_ioctl(ZFS_IOC_DESTROY_BOOKMARKS
, pool
, bmarks
, errlist
);
1067 * Executes a channel program.
1069 * If this function returns 0 the channel program was successfully loaded and
1070 * ran without failing. Note that individual commands the channel program ran
1071 * may have failed and the channel program is responsible for reporting such
1072 * errors through outnvl if they are important.
1074 * This method may also return:
1076 * EINVAL The program contains syntax errors, or an invalid memory or time
1077 * limit was given. No part of the channel program was executed.
1078 * If caused by syntax errors, 'outnvl' contains information about the
1081 * ECHRNG The program was executed, but encountered a runtime error, such as
1082 * calling a function with incorrect arguments, invoking the error()
1083 * function directly, failing an assert() command, etc. Some portion
1084 * of the channel program may have executed and committed changes.
1085 * Information about the failure can be found in 'outnvl'.
1087 * ENOMEM The program fully executed, but the output buffer was not large
1088 * enough to store the returned value. No output is returned through
1091 * ENOSPC The program was terminated because it exceeded its memory usage
1092 * limit. Some portion of the channel program may have executed and
1093 * committed changes to disk. No output is returned through 'outnvl'.
1095 * ETIME The program was terminated because it exceeded its Lua instruction
1096 * limit. Some portion of the channel program may have executed and
1097 * committed changes to disk. No output is returned through 'outnvl'.
1100 lzc_channel_program(const char *pool
, const char *program
, uint64_t instrlimit
,
1101 uint64_t memlimit
, nvlist_t
*argnvl
, nvlist_t
**outnvl
)
1106 args
= fnvlist_alloc();
1107 fnvlist_add_string(args
, ZCP_ARG_PROGRAM
, program
);
1108 fnvlist_add_nvlist(args
, ZCP_ARG_ARGLIST
, argnvl
);
1109 fnvlist_add_uint64(args
, ZCP_ARG_INSTRLIMIT
, instrlimit
);
1110 fnvlist_add_uint64(args
, ZCP_ARG_MEMLIMIT
, memlimit
);
1111 error
= lzc_ioctl(ZFS_IOC_CHANNEL_PROGRAM
, pool
, args
, outnvl
);
1118 * Performs key management functions
1120 * crypto_cmd should be a value from zfs_ioc_crypto_cmd_t. If the command
1121 * specifies to load or change a wrapping key, the key should be specified in
1122 * the hidden_args nvlist so that it is not logged
1125 lzc_load_key(const char *fsname
, boolean_t noop
, uint8_t *wkeydata
,
1130 nvlist_t
*hidden_args
;
1132 if (wkeydata
== NULL
)
1135 ioc_args
= fnvlist_alloc();
1136 hidden_args
= fnvlist_alloc();
1137 fnvlist_add_uint8_array(hidden_args
, "wkeydata", wkeydata
, wkeylen
);
1138 fnvlist_add_nvlist(ioc_args
, ZPOOL_HIDDEN_ARGS
, hidden_args
);
1140 fnvlist_add_boolean(ioc_args
, "noop");
1141 error
= lzc_ioctl(ZFS_IOC_LOAD_KEY
, fsname
, ioc_args
, NULL
);
1142 nvlist_free(hidden_args
);
1143 nvlist_free(ioc_args
);
1149 lzc_unload_key(const char *fsname
)
1151 return (lzc_ioctl(ZFS_IOC_UNLOAD_KEY
, fsname
, NULL
, NULL
));
1155 lzc_change_key(const char *fsname
, uint64_t crypt_cmd
, nvlist_t
*props
,
1156 uint8_t *wkeydata
, uint_t wkeylen
)
1159 nvlist_t
*ioc_args
= fnvlist_alloc();
1160 nvlist_t
*hidden_args
= NULL
;
1162 fnvlist_add_uint64(ioc_args
, "crypt_cmd", crypt_cmd
);
1164 if (wkeydata
!= NULL
) {
1165 hidden_args
= fnvlist_alloc();
1166 fnvlist_add_uint8_array(hidden_args
, "wkeydata", wkeydata
,
1168 fnvlist_add_nvlist(ioc_args
, ZPOOL_HIDDEN_ARGS
, hidden_args
);
1172 fnvlist_add_nvlist(ioc_args
, "props", props
);
1174 error
= lzc_ioctl(ZFS_IOC_CHANGE_KEY
, fsname
, ioc_args
, NULL
);
1175 nvlist_free(hidden_args
);
1176 nvlist_free(ioc_args
);
1182 lzc_reopen(const char *pool_name
, boolean_t scrub_restart
)
1184 nvlist_t
*args
= fnvlist_alloc();
1187 fnvlist_add_boolean_value(args
, "scrub_restart", scrub_restart
);
1189 error
= lzc_ioctl(ZFS_IOC_POOL_REOPEN
, pool_name
, args
, NULL
);