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a132c2b413
mirror_zfs/lib/libzfs/libzfs_sendrecv.c
Alan Somers a132c2b413
Fix EIO after resuming receive of new dataset over an existing one 
When resuming an interrupted ZFS send stream that creates a new dataset
with the same name as an existing dataset, if the existing dataset is
accessed after the failed receive, then after the subsequent successful
receive it will return EIO. This happens because nothing mounts the new
dataset, leaving the old, no longer valid dataset still mounted.

This commit fixes zfs receive to always unmount and remount the
destination, regardless of whether the stream is a new stream or a
resumed stream.

Sponsored by: Axcient
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Ryan Moeller <ryan@iXsystems.com>
Signed-off-by: Alan Somers <asomers@gmail.com>
External-issue: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=249579
Closes #10995
Closes #10999
2020-10-02 17:47:09 -07:00

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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2011, 2020 by Delphix. All rights reserved.
* Copyright (c) 2012, Joyent, Inc. All rights reserved.
* Copyright (c) 2012 Pawel Jakub Dawidek <pawel@dawidek.net>.
* All rights reserved
* Copyright (c) 2013 Steven Hartland. All rights reserved.
* Copyright 2015, OmniTI Computer Consulting, Inc. All rights reserved.
* Copyright 2016 Igor Kozhukhov <ikozhukhov@gmail.com>
* Copyright (c) 2018, loli10K <ezomori.nozomu@gmail.com>. All rights reserved.
* Copyright (c) 2019 Datto Inc.
*/
#include <assert.h>
#include <ctype.h>
#include <errno.h>
#include <libintl.h>
#include <stdio.h>
#include <stdlib.h>
#include <strings.h>
#include <unistd.h>
#include <stddef.h>
#include <fcntl.h>
#include <sys/mount.h>
#include <sys/mntent.h>
#include <sys/mnttab.h>
#include <sys/avl.h>
#include <sys/debug.h>
#include <sys/stat.h>
#include <stddef.h>
#include <pthread.h>
#include <umem.h>
#include <time.h>
#include <libzfs.h>
#include <libzfs_core.h>
#include <libzutil.h>
#include "zfs_namecheck.h"
#include "zfs_prop.h"
#include "zfs_fletcher.h"
#include "libzfs_impl.h"
#include <cityhash.h>
#include <zlib.h>
#include <sys/zio_checksum.h>
#include <sys/dsl_crypt.h>
#include <sys/ddt.h>
#include <sys/socket.h>
#include <sys/sha2.h>
static int zfs_receive_impl(libzfs_handle_t *, const char *, const char *,
recvflags_t *, int, const char *, nvlist_t *, avl_tree_t *, char **,
const char *, nvlist_t *);
static int guid_to_name_redact_snaps(libzfs_handle_t *hdl, const char *parent,
uint64_t guid, boolean_t bookmark_ok, uint64_t *redact_snap_guids,
uint64_t num_redact_snaps, char *name);
static int guid_to_name(libzfs_handle_t *, const char *,
uint64_t, boolean_t, char *);
typedef struct progress_arg {
zfs_handle_t *pa_zhp;
int pa_fd;
boolean_t pa_parsable;
boolean_t pa_estimate;
int pa_verbosity;
} progress_arg_t;
static int
dump_record(dmu_replay_record_t *drr, void *payload, int payload_len,
zio_cksum_t *zc, int outfd)
{
ASSERT3U(offsetof(dmu_replay_record_t, drr_u.drr_checksum.drr_checksum),
==, sizeof (dmu_replay_record_t) - sizeof (zio_cksum_t));
fletcher_4_incremental_native(drr,
offsetof(dmu_replay_record_t, drr_u.drr_checksum.drr_checksum), zc);
if (drr->drr_type != DRR_BEGIN) {
ASSERT(ZIO_CHECKSUM_IS_ZERO(&drr->drr_u.
drr_checksum.drr_checksum));
drr->drr_u.drr_checksum.drr_checksum = *zc;
}
fletcher_4_incremental_native(&drr->drr_u.drr_checksum.drr_checksum,
sizeof (zio_cksum_t), zc);
if (write(outfd, drr, sizeof (*drr)) == -1)
return (errno);
if (payload_len != 0) {
fletcher_4_incremental_native(payload, payload_len, zc);
if (write(outfd, payload, payload_len) == -1)
return (errno);
}
return (0);
}
/*
* Routines for dealing with the AVL tree of fs-nvlists
*/
typedef struct fsavl_node {
avl_node_t fn_node;
nvlist_t *fn_nvfs;
char *fn_snapname;
uint64_t fn_guid;
} fsavl_node_t;
static int
fsavl_compare(const void *arg1, const void *arg2)
{
const fsavl_node_t *fn1 = (const fsavl_node_t *)arg1;
const fsavl_node_t *fn2 = (const fsavl_node_t *)arg2;
return (TREE_CMP(fn1->fn_guid, fn2->fn_guid));
}
/*
* Given the GUID of a snapshot, find its containing filesystem and
* (optionally) name.
*/
static nvlist_t *
fsavl_find(avl_tree_t *avl, uint64_t snapguid, char **snapname)
{
fsavl_node_t fn_find;
fsavl_node_t *fn;
fn_find.fn_guid = snapguid;
fn = avl_find(avl, &fn_find, NULL);
if (fn) {
if (snapname)
*snapname = fn->fn_snapname;
return (fn->fn_nvfs);
}
return (NULL);
}
static void
fsavl_destroy(avl_tree_t *avl)
{
fsavl_node_t *fn;
void *cookie;
if (avl == NULL)
return;
cookie = NULL;
while ((fn = avl_destroy_nodes(avl, &cookie)) != NULL)
free(fn);
avl_destroy(avl);
free(avl);
}
/*
* Given an nvlist, produce an avl tree of snapshots, ordered by guid
*/
static avl_tree_t *
fsavl_create(nvlist_t *fss)
{
avl_tree_t *fsavl;
nvpair_t *fselem = NULL;
if ((fsavl = malloc(sizeof (avl_tree_t))) == NULL)
return (NULL);
avl_create(fsavl, fsavl_compare, sizeof (fsavl_node_t),
offsetof(fsavl_node_t, fn_node));
while ((fselem = nvlist_next_nvpair(fss, fselem)) != NULL) {
nvlist_t *nvfs, *snaps;
nvpair_t *snapelem = NULL;
VERIFY(0 == nvpair_value_nvlist(fselem, &nvfs));
VERIFY(0 == nvlist_lookup_nvlist(nvfs, "snaps", &snaps));
while ((snapelem =
nvlist_next_nvpair(snaps, snapelem)) != NULL) {
fsavl_node_t *fn;
uint64_t guid;
VERIFY(0 == nvpair_value_uint64(snapelem, &guid));
if ((fn = malloc(sizeof (fsavl_node_t))) == NULL) {
fsavl_destroy(fsavl);
return (NULL);
}
fn->fn_nvfs = nvfs;
fn->fn_snapname = nvpair_name(snapelem);
fn->fn_guid = guid;
/*
* Note: if there are multiple snaps with the
* same GUID, we ignore all but one.
*/
if (avl_find(fsavl, fn, NULL) == NULL)
avl_add(fsavl, fn);
else
free(fn);
}
}
return (fsavl);
}
/*
* Routines for dealing with the giant nvlist of fs-nvlists, etc.
*/
typedef struct send_data {
/*
* assigned inside every recursive call,
* restored from *_save on return:
*
* guid of fromsnap snapshot in parent dataset
* txg of fromsnap snapshot in current dataset
* txg of tosnap snapshot in current dataset
*/
uint64_t parent_fromsnap_guid;
uint64_t fromsnap_txg;
uint64_t tosnap_txg;
/* the nvlists get accumulated during depth-first traversal */
nvlist_t *parent_snaps;
nvlist_t *fss;
nvlist_t *snapprops;
nvlist_t *snapholds; /* user holds */
/* send-receive configuration, does not change during traversal */
const char *fsname;
const char *fromsnap;
const char *tosnap;
boolean_t recursive;
boolean_t raw;
boolean_t doall;
boolean_t replicate;
boolean_t verbose;
boolean_t backup;
boolean_t seenfrom;
boolean_t seento;
boolean_t holds; /* were holds requested with send -h */
boolean_t props;
/*
* The header nvlist is of the following format:
* {
* "tosnap" -> string
* "fromsnap" -> string (if incremental)
* "fss" -> {
* id -> {
*
* "name" -> string (full name; for debugging)
* "parentfromsnap" -> number (guid of fromsnap in parent)
*
* "props" -> { name -> value (only if set here) }
* "snaps" -> { name (lastname) -> number (guid) }
* "snapprops" -> { name (lastname) -> { name -> value } }
* "snapholds" -> { name (lastname) -> { holdname -> crtime } }
*
* "origin" -> number (guid) (if clone)
* "is_encroot" -> boolean
* "sent" -> boolean (not on-disk)
* }
* }
* }
*
*/
} send_data_t;
static void
send_iterate_prop(zfs_handle_t *zhp, boolean_t received_only, nvlist_t *nv);
static int
send_iterate_snap(zfs_handle_t *zhp, void *arg)
{
send_data_t *sd = arg;
uint64_t guid = zhp->zfs_dmustats.dds_guid;
uint64_t txg = zhp->zfs_dmustats.dds_creation_txg;
char *snapname;
nvlist_t *nv;
boolean_t isfromsnap, istosnap, istosnapwithnofrom;
snapname = strrchr(zhp->zfs_name, '@')+1;
isfromsnap = (sd->fromsnap != NULL &&
strcmp(sd->fromsnap, snapname) == 0);
istosnap = (sd->tosnap != NULL && (strcmp(sd->tosnap, snapname) == 0));
istosnapwithnofrom = (istosnap && sd->fromsnap == NULL);
if (sd->tosnap_txg != 0 && txg > sd->tosnap_txg) {
if (sd->verbose) {
(void) fprintf(stderr, dgettext(TEXT_DOMAIN,
"skipping snapshot %s because it was created "
"after the destination snapshot (%s)\n"),
zhp->zfs_name, sd->tosnap);
}
zfs_close(zhp);
return (0);
}
VERIFY(0 == nvlist_add_uint64(sd->parent_snaps, snapname, guid));
/*
* NB: if there is no fromsnap here (it's a newly created fs in
* an incremental replication), we will substitute the tosnap.
*/
if (isfromsnap || (sd->parent_fromsnap_guid == 0 && istosnap)) {
sd->parent_fromsnap_guid = guid;
}
if (!sd->recursive) {
if (!sd->seenfrom && isfromsnap) {
sd->seenfrom = B_TRUE;
zfs_close(zhp);
return (0);
}
if ((sd->seento || !sd->seenfrom) && !istosnapwithnofrom) {
zfs_close(zhp);
return (0);
}
if (istosnap)
sd->seento = B_TRUE;
}
VERIFY(0 == nvlist_alloc(&nv, NV_UNIQUE_NAME, 0));
send_iterate_prop(zhp, sd->backup, nv);
VERIFY(0 == nvlist_add_nvlist(sd->snapprops, snapname, nv));
nvlist_free(nv);
if (sd->holds) {
nvlist_t *holds = fnvlist_alloc();
int err = lzc_get_holds(zhp->zfs_name, &holds);
if (err == 0) {
VERIFY(0 == nvlist_add_nvlist(sd->snapholds,
snapname, holds));
}
fnvlist_free(holds);
}
zfs_close(zhp);
return (0);
}
static void
send_iterate_prop(zfs_handle_t *zhp, boolean_t received_only, nvlist_t *nv)
{
nvlist_t *props = NULL;
nvpair_t *elem = NULL;
if (received_only)
props = zfs_get_recvd_props(zhp);
else
props = zhp->zfs_props;
while ((elem = nvlist_next_nvpair(props, elem)) != NULL) {
char *propname = nvpair_name(elem);
zfs_prop_t prop = zfs_name_to_prop(propname);
nvlist_t *propnv;
if (!zfs_prop_user(propname)) {
/*
* Realistically, this should never happen. However,
* we want the ability to add DSL properties without
* needing to make incompatible version changes. We
* need to ignore unknown properties to allow older
* software to still send datasets containing these
* properties, with the unknown properties elided.
*/
if (prop == ZPROP_INVAL)
continue;
if (zfs_prop_readonly(prop))
continue;
}
verify(nvpair_value_nvlist(elem, &propnv) == 0);
if (prop == ZFS_PROP_QUOTA || prop == ZFS_PROP_RESERVATION ||
prop == ZFS_PROP_REFQUOTA ||
prop == ZFS_PROP_REFRESERVATION) {
char *source;
uint64_t value;
verify(nvlist_lookup_uint64(propnv,
ZPROP_VALUE, &value) == 0);
if (zhp->zfs_type == ZFS_TYPE_SNAPSHOT)
continue;
/*
* May have no source before SPA_VERSION_RECVD_PROPS,
* but is still modifiable.
*/
if (nvlist_lookup_string(propnv,
ZPROP_SOURCE, &source) == 0) {
if ((strcmp(source, zhp->zfs_name) != 0) &&
(strcmp(source,
ZPROP_SOURCE_VAL_RECVD) != 0))
continue;
}
} else {
char *source;
if (nvlist_lookup_string(propnv,
ZPROP_SOURCE, &source) != 0)
continue;
if ((strcmp(source, zhp->zfs_name) != 0) &&
(strcmp(source, ZPROP_SOURCE_VAL_RECVD) != 0))
continue;
}
if (zfs_prop_user(propname) ||
zfs_prop_get_type(prop) == PROP_TYPE_STRING) {
char *value;
verify(nvlist_lookup_string(propnv,
ZPROP_VALUE, &value) == 0);
VERIFY(0 == nvlist_add_string(nv, propname, value));
} else {
uint64_t value;
verify(nvlist_lookup_uint64(propnv,
ZPROP_VALUE, &value) == 0);
VERIFY(0 == nvlist_add_uint64(nv, propname, value));
}
}
}
/*
* returns snapshot creation txg
* and returns 0 if the snapshot does not exist
*/
static uint64_t
get_snap_txg(libzfs_handle_t *hdl, const char *fs, const char *snap)
{
char name[ZFS_MAX_DATASET_NAME_LEN];
uint64_t txg = 0;
if (fs == NULL || fs[0] == '\0' || snap == NULL || snap[0] == '\0')
return (txg);
(void) snprintf(name, sizeof (name), "%s@%s", fs, snap);
if (zfs_dataset_exists(hdl, name, ZFS_TYPE_SNAPSHOT)) {
zfs_handle_t *zhp = zfs_open(hdl, name, ZFS_TYPE_SNAPSHOT);
if (zhp != NULL) {
txg = zfs_prop_get_int(zhp, ZFS_PROP_CREATETXG);
zfs_close(zhp);
}
}
return (txg);
}
/*
* recursively generate nvlists describing datasets. See comment
* for the data structure send_data_t above for description of contents
* of the nvlist.
*/
static int
send_iterate_fs(zfs_handle_t *zhp, void *arg)
{
send_data_t *sd = arg;
nvlist_t *nvfs = NULL, *nv = NULL;
int rv = 0;
uint64_t min_txg = 0, max_txg = 0;
uint64_t parent_fromsnap_guid_save = sd->parent_fromsnap_guid;
uint64_t fromsnap_txg_save = sd->fromsnap_txg;
uint64_t tosnap_txg_save = sd->tosnap_txg;
uint64_t txg = zhp->zfs_dmustats.dds_creation_txg;
uint64_t guid = zhp->zfs_dmustats.dds_guid;
uint64_t fromsnap_txg, tosnap_txg;
char guidstring[64];
fromsnap_txg = get_snap_txg(zhp->zfs_hdl, zhp->zfs_name, sd->fromsnap);
if (fromsnap_txg != 0)
sd->fromsnap_txg = fromsnap_txg;
tosnap_txg = get_snap_txg(zhp->zfs_hdl, zhp->zfs_name, sd->tosnap);
if (tosnap_txg != 0)
sd->tosnap_txg = tosnap_txg;
/*
* on the send side, if the current dataset does not have tosnap,
* perform two additional checks:
*
* - skip sending the current dataset if it was created later than
* the parent tosnap
* - return error if the current dataset was created earlier than
* the parent tosnap
*/
if (sd->tosnap != NULL && tosnap_txg == 0) {
if (sd->tosnap_txg != 0 && txg > sd->tosnap_txg) {
if (sd->verbose) {
(void) fprintf(stderr, dgettext(TEXT_DOMAIN,
"skipping dataset %s: snapshot %s does "
"not exist\n"), zhp->zfs_name, sd->tosnap);
}
} else {
(void) fprintf(stderr, dgettext(TEXT_DOMAIN,
"cannot send %s@%s%s: snapshot %s@%s does not "
"exist\n"), sd->fsname, sd->tosnap, sd->recursive ?
dgettext(TEXT_DOMAIN, " recursively") : "",
zhp->zfs_name, sd->tosnap);
rv = EZFS_NOENT;
}
goto out;
}
nvfs = fnvlist_alloc();
fnvlist_add_string(nvfs, "name", zhp->zfs_name);
fnvlist_add_uint64(nvfs, "parentfromsnap",
sd->parent_fromsnap_guid);
if (zhp->zfs_dmustats.dds_origin[0]) {
zfs_handle_t *origin = zfs_open(zhp->zfs_hdl,
zhp->zfs_dmustats.dds_origin, ZFS_TYPE_SNAPSHOT);
if (origin == NULL) {
rv = -1;
goto out;
}
fnvlist_add_uint64(nvfs, "origin",
origin->zfs_dmustats.dds_guid);
zfs_close(origin);
}
/* iterate over props */
if (sd->props || sd->backup || sd->recursive) {
nv = fnvlist_alloc();
send_iterate_prop(zhp, sd->backup, nv);
}
if (zfs_prop_get_int(zhp, ZFS_PROP_ENCRYPTION) != ZIO_CRYPT_OFF) {
boolean_t encroot;
/* determine if this dataset is an encryption root */
if (zfs_crypto_get_encryption_root(zhp, &encroot, NULL) != 0) {
rv = -1;
goto out;
}
if (encroot)
fnvlist_add_boolean(nvfs, "is_encroot");
/*
* Encrypted datasets can only be sent with properties if
* the raw flag is specified because the receive side doesn't
* currently have a mechanism for recursively asking the user
* for new encryption parameters.
*/
if (!sd->raw) {
(void) fprintf(stderr, dgettext(TEXT_DOMAIN,
"cannot send %s@%s: encrypted dataset %s may not "
"be sent with properties without the raw flag\n"),
sd->fsname, sd->tosnap, zhp->zfs_name);
rv = -1;
goto out;
}
}
if (nv != NULL)
fnvlist_add_nvlist(nvfs, "props", nv);
/* iterate over snaps, and set sd->parent_fromsnap_guid */
sd->parent_fromsnap_guid = 0;
sd->parent_snaps = fnvlist_alloc();
sd->snapprops = fnvlist_alloc();
if (sd->holds)
VERIFY(0 == nvlist_alloc(&sd->snapholds, NV_UNIQUE_NAME, 0));
/*
* If this is a "doall" send, a replicate send or we're just trying
* to gather a list of previous snapshots, iterate through all the
* snaps in the txg range. Otherwise just look at the one we're
* interested in.
*/
if (sd->doall || sd->replicate || sd->tosnap == NULL) {
if (!sd->replicate && fromsnap_txg != 0)
min_txg = fromsnap_txg;
if (!sd->replicate && tosnap_txg != 0)
max_txg = tosnap_txg;
(void) zfs_iter_snapshots_sorted(zhp, send_iterate_snap, sd,
min_txg, max_txg);
} else {
char snapname[MAXPATHLEN] = { 0 };
zfs_handle_t *snap;
(void) snprintf(snapname, sizeof (snapname), "%s@%s",
zhp->zfs_name, sd->tosnap);
if (sd->fromsnap != NULL)
sd->seenfrom = B_TRUE;
snap = zfs_open(zhp->zfs_hdl, snapname,
ZFS_TYPE_SNAPSHOT);
if (snap != NULL)
(void) send_iterate_snap(snap, sd);
}
fnvlist_add_nvlist(nvfs, "snaps", sd->parent_snaps);
fnvlist_add_nvlist(nvfs, "snapprops", sd->snapprops);
if (sd->holds)
fnvlist_add_nvlist(nvfs, "snapholds", sd->snapholds);
fnvlist_free(sd->parent_snaps);
fnvlist_free(sd->snapprops);
fnvlist_free(sd->snapholds);
/* Do not allow the size of the properties list to exceed the limit */
if ((fnvlist_size(nvfs) + fnvlist_size(sd->fss)) >
zhp->zfs_hdl->libzfs_max_nvlist) {
(void) fprintf(stderr, dgettext(TEXT_DOMAIN,
"warning: cannot send %s@%s: the size of the list of "
"snapshots and properties is too large to be received "
"successfully.\n"
"Select a smaller number of snapshots to send.\n"),
zhp->zfs_name, sd->tosnap);
rv = EZFS_NOSPC;
goto out;
}
/* add this fs to nvlist */
(void) snprintf(guidstring, sizeof (guidstring),
"0x%llx", (longlong_t)guid);
fnvlist_add_nvlist(sd->fss, guidstring, nvfs);
/* iterate over children */
if (sd->recursive)
rv = zfs_iter_filesystems(zhp, send_iterate_fs, sd);
out:
sd->parent_fromsnap_guid = parent_fromsnap_guid_save;
sd->fromsnap_txg = fromsnap_txg_save;
sd->tosnap_txg = tosnap_txg_save;
fnvlist_free(nv);
fnvlist_free(nvfs);
zfs_close(zhp);
return (rv);
}
static int
gather_nvlist(libzfs_handle_t *hdl, const char *fsname, const char *fromsnap,
const char *tosnap, boolean_t recursive, boolean_t raw, boolean_t doall,
boolean_t replicate, boolean_t verbose, boolean_t backup, boolean_t holds,
boolean_t props, nvlist_t **nvlp, avl_tree_t **avlp)
{
zfs_handle_t *zhp;
send_data_t sd = { 0 };
int error;
zhp = zfs_open(hdl, fsname, ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME);
if (zhp == NULL)
return (EZFS_BADTYPE);
VERIFY(0 == nvlist_alloc(&sd.fss, NV_UNIQUE_NAME, 0));
sd.fsname = fsname;
sd.fromsnap = fromsnap;
sd.tosnap = tosnap;
sd.recursive = recursive;
sd.raw = raw;
sd.doall = doall;
sd.replicate = replicate;
sd.verbose = verbose;
sd.backup = backup;
sd.holds = holds;
sd.props = props;
if ((error = send_iterate_fs(zhp, &sd)) != 0) {
nvlist_free(sd.fss);
if (avlp != NULL)
*avlp = NULL;
*nvlp = NULL;
return (error);
}
if (avlp != NULL && (*avlp = fsavl_create(sd.fss)) == NULL) {
nvlist_free(sd.fss);
*nvlp = NULL;
return (EZFS_NOMEM);
}
*nvlp = sd.fss;
return (0);
}
/*
* Routines specific to "zfs send"
*/
typedef struct send_dump_data {
/* these are all just the short snapname (the part after the @) */
const char *fromsnap;
const char *tosnap;
char prevsnap[ZFS_MAX_DATASET_NAME_LEN];
uint64_t prevsnap_obj;
boolean_t seenfrom, seento, replicate, doall, fromorigin;
boolean_t dryrun, parsable, progress, embed_data, std_out;
boolean_t large_block, compress, raw, holds;
int outfd;
boolean_t err;
nvlist_t *fss;
nvlist_t *snapholds;
avl_tree_t *fsavl;
snapfilter_cb_t *filter_cb;
void *filter_cb_arg;
nvlist_t *debugnv;
char holdtag[ZFS_MAX_DATASET_NAME_LEN];
int cleanup_fd;
int verbosity;
uint64_t size;
} send_dump_data_t;
static int
zfs_send_space(zfs_handle_t *zhp, const char *snapname, const char *from,
enum lzc_send_flags flags, uint64_t *spacep)
{
libzfs_handle_t *hdl = zhp->zfs_hdl;
int error;
assert(snapname != NULL);
error = lzc_send_space(snapname, from, flags, spacep);
if (error != 0) {
char errbuf[1024];
(void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
"warning: cannot estimate space for '%s'"), snapname);
switch (error) {
case EXDEV:
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"not an earlier snapshot from the same fs"));
return (zfs_error(hdl, EZFS_CROSSTARGET, errbuf));
case ENOENT:
if (zfs_dataset_exists(hdl, snapname,
ZFS_TYPE_SNAPSHOT)) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"incremental source (%s) does not exist"),
snapname);
}
return (zfs_error(hdl, EZFS_NOENT, errbuf));
case EDQUOT:
case EFBIG:
case EIO:
case ENOLINK:
case ENOSPC:
case ENOSTR:
case ENXIO:
case EPIPE:
case ERANGE:
case EFAULT:
case EROFS:
case EINVAL:
zfs_error_aux(hdl, strerror(error));
return (zfs_error(hdl, EZFS_BADBACKUP, errbuf));
default:
return (zfs_standard_error(hdl, error, errbuf));
}
}
return (0);
}
/*
* Dumps a backup of the given snapshot (incremental from fromsnap if it's not
* NULL) to the file descriptor specified by outfd.
*/
static int
dump_ioctl(zfs_handle_t *zhp, const char *fromsnap, uint64_t fromsnap_obj,
boolean_t fromorigin, int outfd, enum lzc_send_flags flags,
nvlist_t *debugnv)
{
zfs_cmd_t zc = {"\0"};
libzfs_handle_t *hdl = zhp->zfs_hdl;
nvlist_t *thisdbg;
assert(zhp->zfs_type == ZFS_TYPE_SNAPSHOT);
assert(fromsnap_obj == 0 || !fromorigin);
(void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
zc.zc_cookie = outfd;
zc.zc_obj = fromorigin;
zc.zc_sendobj = zfs_prop_get_int(zhp, ZFS_PROP_OBJSETID);
zc.zc_fromobj = fromsnap_obj;
zc.zc_flags = flags;
VERIFY(0 == nvlist_alloc(&thisdbg, NV_UNIQUE_NAME, 0));
if (fromsnap && fromsnap[0] != '\0') {
VERIFY(0 == nvlist_add_string(thisdbg,
"fromsnap", fromsnap));
}
if (zfs_ioctl(zhp->zfs_hdl, ZFS_IOC_SEND, &zc) != 0) {
char errbuf[1024];
(void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
"warning: cannot send '%s'"), zhp->zfs_name);
VERIFY(0 == nvlist_add_uint64(thisdbg, "error", errno));
if (debugnv) {
VERIFY(0 == nvlist_add_nvlist(debugnv,
zhp->zfs_name, thisdbg));
}
nvlist_free(thisdbg);
switch (errno) {
case EXDEV:
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"not an earlier snapshot from the same fs"));
return (zfs_error(hdl, EZFS_CROSSTARGET, errbuf));
case EACCES:
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"source key must be loaded"));
return (zfs_error(hdl, EZFS_CRYPTOFAILED, errbuf));
case ENOENT:
if (zfs_dataset_exists(hdl, zc.zc_name,
ZFS_TYPE_SNAPSHOT)) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"incremental source (@%s) does not exist"),
zc.zc_value);
}
return (zfs_error(hdl, EZFS_NOENT, errbuf));
case EDQUOT:
case EFBIG:
case EIO:
case ENOLINK:
case ENOSPC:
case ENOSTR:
case ENXIO:
case EPIPE:
case ERANGE:
case EFAULT:
case EROFS:
zfs_error_aux(hdl, strerror(errno));
return (zfs_error(hdl, EZFS_BADBACKUP, errbuf));
default:
return (zfs_standard_error(hdl, errno, errbuf));
}
}
if (debugnv)
VERIFY(0 == nvlist_add_nvlist(debugnv, zhp->zfs_name, thisdbg));
nvlist_free(thisdbg);
return (0);
}
static void
gather_holds(zfs_handle_t *zhp, send_dump_data_t *sdd)
{
assert(zhp->zfs_type == ZFS_TYPE_SNAPSHOT);
/*
* zfs_send() only sets snapholds for sends that need them,
* e.g. replication and doall.
*/
if (sdd->snapholds == NULL)
return;
fnvlist_add_string(sdd->snapholds, zhp->zfs_name, sdd->holdtag);
}
int
zfs_send_progress(zfs_handle_t *zhp, int fd, uint64_t *bytes_written,
uint64_t *blocks_visited)
{
zfs_cmd_t zc = {"\0"};
(void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
zc.zc_cookie = fd;
if (zfs_ioctl(zhp->zfs_hdl, ZFS_IOC_SEND_PROGRESS, &zc) != 0)
return (errno);
if (bytes_written != NULL)
*bytes_written = zc.zc_cookie;
if (blocks_visited != NULL)
*blocks_visited = zc.zc_objset_type;
return (0);
}
static void *
send_progress_thread(void *arg)
{
progress_arg_t *pa = arg;
zfs_handle_t *zhp = pa->pa_zhp;
uint64_t bytes;
uint64_t blocks;
char buf[16];
time_t t;
struct tm *tm;
boolean_t firstloop = B_TRUE;
/*
* Print the progress from ZFS_IOC_SEND_PROGRESS every second.
*/
for (;;) {
int err;
(void) sleep(1);
if ((err = zfs_send_progress(zhp, pa->pa_fd, &bytes,
&blocks)) != 0) {
if (err == EINTR || err == ENOENT)
return ((void *)0);
return ((void *)(uintptr_t)err);
}
if (firstloop && !pa->pa_parsable) {
(void) fprintf(stderr,
"TIME %s %sSNAPSHOT %s\n",
pa->pa_estimate ? "BYTES" : " SENT",
pa->pa_verbosity >= 2 ? " BLOCKS " : "",
zhp->zfs_name);
firstloop = B_FALSE;
}
(void) time(&t);
tm = localtime(&t);
if (pa->pa_verbosity >= 2 && pa->pa_parsable) {
(void) fprintf(stderr,
"%02d:%02d:%02d\t%llu\t%llu\t%s\n",
tm->tm_hour, tm->tm_min, tm->tm_sec,
(u_longlong_t)bytes, (u_longlong_t)blocks,
zhp->zfs_name);
} else if (pa->pa_verbosity >= 2) {
zfs_nicenum(bytes, buf, sizeof (buf));
(void) fprintf(stderr,
"%02d:%02d:%02d %5s %8llu %s\n",
tm->tm_hour, tm->tm_min, tm->tm_sec,
buf, (u_longlong_t)blocks, zhp->zfs_name);
} else if (pa->pa_parsable) {
(void) fprintf(stderr, "%02d:%02d:%02d\t%llu\t%s\n",
tm->tm_hour, tm->tm_min, tm->tm_sec,
(u_longlong_t)bytes, zhp->zfs_name);
} else {
zfs_nicebytes(bytes, buf, sizeof (buf));
(void) fprintf(stderr, "%02d:%02d:%02d %5s %s\n",
tm->tm_hour, tm->tm_min, tm->tm_sec,
buf, zhp->zfs_name);
}
}
}
static void
send_print_verbose(FILE *fout, const char *tosnap, const char *fromsnap,
uint64_t size, boolean_t parsable)
{
if (parsable) {
if (fromsnap != NULL) {
(void) fprintf(fout, "incremental\t%s\t%s",
fromsnap, tosnap);
} else {
(void) fprintf(fout, "full\t%s",
tosnap);
}
} else {
if (fromsnap != NULL) {
if (strchr(fromsnap, '@') == NULL &&
strchr(fromsnap, '#') == NULL) {
(void) fprintf(fout, dgettext(TEXT_DOMAIN,
"send from @%s to %s"),
fromsnap, tosnap);
} else {
(void) fprintf(fout, dgettext(TEXT_DOMAIN,
"send from %s to %s"),
fromsnap, tosnap);
}
} else {
(void) fprintf(fout, dgettext(TEXT_DOMAIN,
"full send of %s"),
tosnap);
}
}
if (parsable) {
(void) fprintf(fout, "\t%llu",
(longlong_t)size);
} else if (size != 0) {
char buf[16];
zfs_nicebytes(size, buf, sizeof (buf));
(void) fprintf(fout, dgettext(TEXT_DOMAIN,
" estimated size is %s"), buf);
}
(void) fprintf(fout, "\n");
}
static int
dump_snapshot(zfs_handle_t *zhp, void *arg)
{
send_dump_data_t *sdd = arg;
progress_arg_t pa = { 0 };
pthread_t tid;
char *thissnap;
enum lzc_send_flags flags = 0;
int err;
boolean_t isfromsnap, istosnap, fromorigin;
boolean_t exclude = B_FALSE;
FILE *fout = sdd->std_out ? stdout : stderr;
err = 0;
thissnap = strchr(zhp->zfs_name, '@') + 1;
isfromsnap = (sdd->fromsnap != NULL &&
strcmp(sdd->fromsnap, thissnap) == 0);
if (!sdd->seenfrom && isfromsnap) {
gather_holds(zhp, sdd);
sdd->seenfrom = B_TRUE;
(void) strlcpy(sdd->prevsnap, thissnap,
sizeof (sdd->prevsnap));
sdd->prevsnap_obj = zfs_prop_get_int(zhp, ZFS_PROP_OBJSETID);
zfs_close(zhp);
return (0);
}
if (sdd->seento || !sdd->seenfrom) {
zfs_close(zhp);
return (0);
}
istosnap = (strcmp(sdd->tosnap, thissnap) == 0);
if (istosnap)
sdd->seento = B_TRUE;
if (sdd->large_block)
flags |= LZC_SEND_FLAG_LARGE_BLOCK;
if (sdd->embed_data)
flags |= LZC_SEND_FLAG_EMBED_DATA;
if (sdd->compress)
flags |= LZC_SEND_FLAG_COMPRESS;
if (sdd->raw)
flags |= LZC_SEND_FLAG_RAW;
if (!sdd->doall && !isfromsnap && !istosnap) {
if (sdd->replicate) {
char *snapname;
nvlist_t *snapprops;
/*
* Filter out all intermediate snapshots except origin
* snapshots needed to replicate clones.
*/
nvlist_t *nvfs = fsavl_find(sdd->fsavl,
zhp->zfs_dmustats.dds_guid, &snapname);
VERIFY(0 == nvlist_lookup_nvlist(nvfs,
"snapprops", &snapprops));
VERIFY(0 == nvlist_lookup_nvlist(snapprops,
thissnap, &snapprops));
exclude = !nvlist_exists(snapprops, "is_clone_origin");
} else {
exclude = B_TRUE;
}
}
/*
* If a filter function exists, call it to determine whether
* this snapshot will be sent.
*/
if (exclude || (sdd->filter_cb != NULL &&
sdd->filter_cb(zhp, sdd->filter_cb_arg) == B_FALSE)) {
/*
* This snapshot is filtered out. Don't send it, and don't
* set prevsnap_obj, so it will be as if this snapshot didn't
* exist, and the next accepted snapshot will be sent as
* an incremental from the last accepted one, or as the
* first (and full) snapshot in the case of a replication,
* non-incremental send.
*/
zfs_close(zhp);
return (0);
}
gather_holds(zhp, sdd);
fromorigin = sdd->prevsnap[0] == '\0' &&
(sdd->fromorigin || sdd->replicate);
if (sdd->verbosity != 0) {
uint64_t size = 0;
char fromds[ZFS_MAX_DATASET_NAME_LEN];
if (sdd->prevsnap[0] != '\0') {
(void) strlcpy(fromds, zhp->zfs_name, sizeof (fromds));
*(strchr(fromds, '@') + 1) = '\0';
(void) strlcat(fromds, sdd->prevsnap, sizeof (fromds));
}
if (zfs_send_space(zhp, zhp->zfs_name,
sdd->prevsnap[0] ? fromds : NULL, flags, &size) != 0) {
size = 0; /* cannot estimate send space */
} else {
send_print_verbose(fout, zhp->zfs_name,
sdd->prevsnap[0] ? sdd->prevsnap : NULL,
size, sdd->parsable);
}
sdd->size += size;
}
if (!sdd->dryrun) {
/*
* If progress reporting is requested, spawn a new thread to
* poll ZFS_IOC_SEND_PROGRESS at a regular interval.
*/
if (sdd->progress) {
pa.pa_zhp = zhp;
pa.pa_fd = sdd->outfd;
pa.pa_parsable = sdd->parsable;
pa.pa_estimate = B_FALSE;
pa.pa_verbosity = sdd->verbosity;
if ((err = pthread_create(&tid, NULL,
send_progress_thread, &pa)) != 0) {
zfs_close(zhp);
return (err);
}
}
err = dump_ioctl(zhp, sdd->prevsnap, sdd->prevsnap_obj,
fromorigin, sdd->outfd, flags, sdd->debugnv);
if (sdd->progress) {
void *status = NULL;
(void) pthread_cancel(tid);
(void) pthread_join(tid, &status);
int error = (int)(uintptr_t)status;
if (error != 0 && status != PTHREAD_CANCELED) {
char errbuf[1024];
(void) snprintf(errbuf, sizeof (errbuf),
dgettext(TEXT_DOMAIN,
"progress thread exited nonzero"));
return (zfs_standard_error(zhp->zfs_hdl, error,
errbuf));
}
}
}
(void) strcpy(sdd->prevsnap, thissnap);
sdd->prevsnap_obj = zfs_prop_get_int(zhp, ZFS_PROP_OBJSETID);
zfs_close(zhp);
return (err);
}
static int
dump_filesystem(zfs_handle_t *zhp, void *arg)
{
int rv = 0;
send_dump_data_t *sdd = arg;
boolean_t missingfrom = B_FALSE;
zfs_cmd_t zc = {"\0"};
uint64_t min_txg = 0, max_txg = 0;
(void) snprintf(zc.zc_name, sizeof (zc.zc_name), "%s@%s",
zhp->zfs_name, sdd->tosnap);
if (zfs_ioctl(zhp->zfs_hdl, ZFS_IOC_OBJSET_STATS, &zc) != 0) {
(void) fprintf(stderr, dgettext(TEXT_DOMAIN,
"WARNING: could not send %s@%s: does not exist\n"),
zhp->zfs_name, sdd->tosnap);
sdd->err = B_TRUE;
return (0);
}
if (sdd->replicate && sdd->fromsnap) {
/*
* If this fs does not have fromsnap, and we're doing
* recursive, we need to send a full stream from the
* beginning (or an incremental from the origin if this
* is a clone). If we're doing non-recursive, then let
* them get the error.
*/
(void) snprintf(zc.zc_name, sizeof (zc.zc_name), "%s@%s",
zhp->zfs_name, sdd->fromsnap);
if (zfs_ioctl(zhp->zfs_hdl,
ZFS_IOC_OBJSET_STATS, &zc) != 0) {
missingfrom = B_TRUE;
}
}
sdd->seenfrom = sdd->seento = sdd->prevsnap[0] = 0;
sdd->prevsnap_obj = 0;
if (sdd->fromsnap == NULL || missingfrom)
sdd->seenfrom = B_TRUE;
/*
* Iterate through all snapshots and process the ones we will be
* sending. If we only have a "from" and "to" snapshot to deal
* with, we can avoid iterating through all the other snapshots.
*/
if (sdd->doall || sdd->replicate || sdd->tosnap == NULL) {
if (!sdd->replicate && sdd->fromsnap != NULL)
min_txg = get_snap_txg(zhp->zfs_hdl, zhp->zfs_name,
sdd->fromsnap);
if (!sdd->replicate && sdd->tosnap != NULL)
max_txg = get_snap_txg(zhp->zfs_hdl, zhp->zfs_name,
sdd->tosnap);
rv = zfs_iter_snapshots_sorted(zhp, dump_snapshot, arg,
min_txg, max_txg);
} else {
char snapname[MAXPATHLEN] = { 0 };
zfs_handle_t *snap;
if (!sdd->seenfrom) {
(void) snprintf(snapname, sizeof (snapname),
"%s@%s", zhp->zfs_name, sdd->fromsnap);
snap = zfs_open(zhp->zfs_hdl, snapname,
ZFS_TYPE_SNAPSHOT);
if (snap != NULL)
rv = dump_snapshot(snap, sdd);
else
rv = -1;
}
if (rv == 0) {
(void) snprintf(snapname, sizeof (snapname),
"%s@%s", zhp->zfs_name, sdd->tosnap);
snap = zfs_open(zhp->zfs_hdl, snapname,
ZFS_TYPE_SNAPSHOT);
if (snap != NULL)
rv = dump_snapshot(snap, sdd);
else
rv = -1;
}
}
if (!sdd->seenfrom) {
(void) fprintf(stderr, dgettext(TEXT_DOMAIN,
"WARNING: could not send %s@%s:\n"
"incremental source (%s@%s) does not exist\n"),
zhp->zfs_name, sdd->tosnap,
zhp->zfs_name, sdd->fromsnap);
sdd->err = B_TRUE;
} else if (!sdd->seento) {
if (sdd->fromsnap) {
(void) fprintf(stderr, dgettext(TEXT_DOMAIN,
"WARNING: could not send %s@%s:\n"
"incremental source (%s@%s) "
"is not earlier than it\n"),
zhp->zfs_name, sdd->tosnap,
zhp->zfs_name, sdd->fromsnap);
} else {
(void) fprintf(stderr, dgettext(TEXT_DOMAIN,
"WARNING: "
"could not send %s@%s: does not exist\n"),
zhp->zfs_name, sdd->tosnap);
}
sdd->err = B_TRUE;
}
return (rv);
}
static int
dump_filesystems(zfs_handle_t *rzhp, void *arg)
{
send_dump_data_t *sdd = arg;
nvpair_t *fspair;
boolean_t needagain, progress;
if (!sdd->replicate)
return (dump_filesystem(rzhp, sdd));
/* Mark the clone origin snapshots. */
for (fspair = nvlist_next_nvpair(sdd->fss, NULL); fspair;
fspair = nvlist_next_nvpair(sdd->fss, fspair)) {
nvlist_t *nvfs;
uint64_t origin_guid = 0;
VERIFY(0 == nvpair_value_nvlist(fspair, &nvfs));
(void) nvlist_lookup_uint64(nvfs, "origin", &origin_guid);
if (origin_guid != 0) {
char *snapname;
nvlist_t *origin_nv = fsavl_find(sdd->fsavl,
origin_guid, &snapname);
if (origin_nv != NULL) {
nvlist_t *snapprops;
VERIFY(0 == nvlist_lookup_nvlist(origin_nv,
"snapprops", &snapprops));
VERIFY(0 == nvlist_lookup_nvlist(snapprops,
snapname, &snapprops));
VERIFY(0 == nvlist_add_boolean(
snapprops, "is_clone_origin"));
}
}
}
again:
needagain = progress = B_FALSE;
for (fspair = nvlist_next_nvpair(sdd->fss, NULL); fspair;
fspair = nvlist_next_nvpair(sdd->fss, fspair)) {
nvlist_t *fslist, *parent_nv;
char *fsname;
zfs_handle_t *zhp;
int err;
uint64_t origin_guid = 0;
uint64_t parent_guid = 0;
VERIFY(nvpair_value_nvlist(fspair, &fslist) == 0);
if (nvlist_lookup_boolean(fslist, "sent") == 0)
continue;
VERIFY(nvlist_lookup_string(fslist, "name", &fsname) == 0);
(void) nvlist_lookup_uint64(fslist, "origin", &origin_guid);
(void) nvlist_lookup_uint64(fslist, "parentfromsnap",
&parent_guid);
if (parent_guid != 0) {
parent_nv = fsavl_find(sdd->fsavl, parent_guid, NULL);
if (!nvlist_exists(parent_nv, "sent")) {
/* parent has not been sent; skip this one */
needagain = B_TRUE;
continue;
}
}
if (origin_guid != 0) {
nvlist_t *origin_nv = fsavl_find(sdd->fsavl,
origin_guid, NULL);
if (origin_nv != NULL &&
!nvlist_exists(origin_nv, "sent")) {
/*
* origin has not been sent yet;
* skip this clone.
*/
needagain = B_TRUE;
continue;
}
}
zhp = zfs_open(rzhp->zfs_hdl, fsname, ZFS_TYPE_DATASET);
if (zhp == NULL)
return (-1);
err = dump_filesystem(zhp, sdd);
VERIFY(nvlist_add_boolean(fslist, "sent") == 0);
progress = B_TRUE;
zfs_close(zhp);
if (err)
return (err);
}
if (needagain) {
assert(progress);
goto again;
}
/* clean out the sent flags in case we reuse this fss */
for (fspair = nvlist_next_nvpair(sdd->fss, NULL); fspair;
fspair = nvlist_next_nvpair(sdd->fss, fspair)) {
nvlist_t *fslist;
VERIFY(nvpair_value_nvlist(fspair, &fslist) == 0);
(void) nvlist_remove_all(fslist, "sent");
}
return (0);
}
nvlist_t *
zfs_send_resume_token_to_nvlist(libzfs_handle_t *hdl, const char *token)
{
unsigned int version;
int nread, i;
unsigned long long checksum, packed_len;
/*
* Decode token header, which is:
* <token version>-<checksum of payload>-<uncompressed payload length>
* Note that the only supported token version is 1.
*/
nread = sscanf(token, "%u-%llx-%llx-",
&version, &checksum, &packed_len);
if (nread != 3) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"resume token is corrupt (invalid format)"));
return (NULL);
}
if (version != ZFS_SEND_RESUME_TOKEN_VERSION) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"resume token is corrupt (invalid version %u)"),
version);
return (NULL);
}
/* convert hexadecimal representation to binary */
token = strrchr(token, '-') + 1;
int len = strlen(token) / 2;
unsigned char *compressed = zfs_alloc(hdl, len);
for (i = 0; i < len; i++) {
nread = sscanf(token + i * 2, "%2hhx", compressed + i);
if (nread != 1) {
free(compressed);
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"resume token is corrupt "
"(payload is not hex-encoded)"));
return (NULL);
}
}
/* verify checksum */
zio_cksum_t cksum;
fletcher_4_native_varsize(compressed, len, &cksum);
if (cksum.zc_word[0] != checksum) {
free(compressed);
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"resume token is corrupt (incorrect checksum)"));
return (NULL);
}
/* uncompress */
void *packed = zfs_alloc(hdl, packed_len);
uLongf packed_len_long = packed_len;
if (uncompress(packed, &packed_len_long, compressed, len) != Z_OK ||
packed_len_long != packed_len) {
free(packed);
free(compressed);
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"resume token is corrupt (decompression failed)"));
return (NULL);
}
/* unpack nvlist */
nvlist_t *nv;
int error = nvlist_unpack(packed, packed_len, &nv, KM_SLEEP);
free(packed);
free(compressed);
if (error != 0) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"resume token is corrupt (nvlist_unpack failed)"));
return (NULL);
}
return (nv);
}
static enum lzc_send_flags
lzc_flags_from_sendflags(const sendflags_t *flags)
{
enum lzc_send_flags lzc_flags = 0;
if (flags->largeblock)
lzc_flags |= LZC_SEND_FLAG_LARGE_BLOCK;
if (flags->embed_data)
lzc_flags |= LZC_SEND_FLAG_EMBED_DATA;
if (flags->compress)
lzc_flags |= LZC_SEND_FLAG_COMPRESS;
if (flags->raw)
lzc_flags |= LZC_SEND_FLAG_RAW;
if (flags->saved)
lzc_flags |= LZC_SEND_FLAG_SAVED;
return (lzc_flags);
}
static int
estimate_size(zfs_handle_t *zhp, const char *from, int fd, sendflags_t *flags,
uint64_t resumeobj, uint64_t resumeoff, uint64_t bytes,
const char *redactbook, char *errbuf)
{
uint64_t size;
FILE *fout = flags->dryrun ? stdout : stderr;
progress_arg_t pa = { 0 };
int err = 0;
pthread_t ptid;
if (flags->progress) {
pa.pa_zhp = zhp;
pa.pa_fd = fd;
pa.pa_parsable = flags->parsable;
pa.pa_estimate = B_TRUE;
pa.pa_verbosity = flags->verbosity;
err = pthread_create(&ptid, NULL,
send_progress_thread, &pa);
if (err != 0) {
zfs_error_aux(zhp->zfs_hdl, strerror(errno));
return (zfs_error(zhp->zfs_hdl,
EZFS_THREADCREATEFAILED, errbuf));
}
}
err = lzc_send_space_resume_redacted(zhp->zfs_name, from,
lzc_flags_from_sendflags(flags), resumeobj, resumeoff, bytes,
redactbook, fd, &size);
if (flags->progress) {
void *status = NULL;
(void) pthread_cancel(ptid);
(void) pthread_join(ptid, &status);
int error = (int)(uintptr_t)status;
if (error != 0 && status != PTHREAD_CANCELED) {
char errbuf[1024];
(void) snprintf(errbuf, sizeof (errbuf),
dgettext(TEXT_DOMAIN, "progress thread exited "
"nonzero"));
return (zfs_standard_error(zhp->zfs_hdl, error,
errbuf));
}
}
if (err != 0) {
zfs_error_aux(zhp->zfs_hdl, strerror(err));
return (zfs_error(zhp->zfs_hdl, EZFS_BADBACKUP,
errbuf));
}
send_print_verbose(fout, zhp->zfs_name, from, size,
flags->parsable);
if (flags->parsable) {
(void) fprintf(fout, "size\t%llu\n", (longlong_t)size);
} else {
char buf[16];
zfs_nicenum(size, buf, sizeof (buf));
(void) fprintf(fout, dgettext(TEXT_DOMAIN,
"total estimated size is %s\n"), buf);
}
return (0);
}
static boolean_t
redact_snaps_contains(const uint64_t *snaps, uint64_t num_snaps, uint64_t guid)
{
for (int i = 0; i < num_snaps; i++) {
if (snaps[i] == guid)
return (B_TRUE);
}
return (B_FALSE);
}
static boolean_t
redact_snaps_equal(const uint64_t *snaps1, uint64_t num_snaps1,
const uint64_t *snaps2, uint64_t num_snaps2)
{
if (num_snaps1 != num_snaps2)
return (B_FALSE);
for (int i = 0; i < num_snaps1; i++) {
if (!redact_snaps_contains(snaps2, num_snaps2, snaps1[i]))
return (B_FALSE);
}
return (B_TRUE);
}
/*
* Check that the list of redaction snapshots in the bookmark matches the send
* we're resuming, and return whether or not it's complete.
*
* Note that the caller needs to free the contents of *bookname with free() if
* this function returns successfully.
*/
static int
find_redact_book(libzfs_handle_t *hdl, const char *path,
const uint64_t *redact_snap_guids, int num_redact_snaps,
char **bookname)
{
char errbuf[1024];
int error = 0;
nvlist_t *props = fnvlist_alloc();
nvlist_t *bmarks;
(void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
"cannot resume send"));
fnvlist_add_boolean(props, "redact_complete");
fnvlist_add_boolean(props, zfs_prop_to_name(ZFS_PROP_REDACT_SNAPS));
error = lzc_get_bookmarks(path, props, &bmarks);
nvlist_free(props);
if (error != 0) {
if (error == ESRCH) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"nonexistent redaction bookmark provided"));
} else if (error == ENOENT) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"dataset to be sent no longer exists"));
} else {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"unknown error: %s"), strerror(error));
}
return (zfs_error(hdl, EZFS_BADPROP, errbuf));
}
nvpair_t *pair;
for (pair = nvlist_next_nvpair(bmarks, NULL); pair;
pair = nvlist_next_nvpair(bmarks, pair)) {
nvlist_t *bmark = fnvpair_value_nvlist(pair);
nvlist_t *vallist = fnvlist_lookup_nvlist(bmark,
zfs_prop_to_name(ZFS_PROP_REDACT_SNAPS));
uint_t len = 0;
uint64_t *bmarksnaps = fnvlist_lookup_uint64_array(vallist,
ZPROP_VALUE, &len);
if (redact_snaps_equal(redact_snap_guids,
num_redact_snaps, bmarksnaps, len)) {
break;
}
}
if (pair == NULL) {
fnvlist_free(bmarks);
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"no appropriate redaction bookmark exists"));
return (zfs_error(hdl, EZFS_BADPROP, errbuf));
}
char *name = nvpair_name(pair);
nvlist_t *bmark = fnvpair_value_nvlist(pair);
nvlist_t *vallist = fnvlist_lookup_nvlist(bmark, "redact_complete");
boolean_t complete = fnvlist_lookup_boolean_value(vallist,
ZPROP_VALUE);
if (!complete) {
fnvlist_free(bmarks);
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"incomplete redaction bookmark provided"));
return (zfs_error(hdl, EZFS_BADPROP, errbuf));
}
*bookname = strndup(name, ZFS_MAX_DATASET_NAME_LEN);
ASSERT3P(*bookname, !=, NULL);
fnvlist_free(bmarks);
return (0);
}
static int
zfs_send_resume_impl(libzfs_handle_t *hdl, sendflags_t *flags, int outfd,
nvlist_t *resume_nvl)
{
char errbuf[1024];
char *toname;
char *fromname = NULL;
uint64_t resumeobj, resumeoff, toguid, fromguid, bytes;
zfs_handle_t *zhp;
int error = 0;
char name[ZFS_MAX_DATASET_NAME_LEN];
enum lzc_send_flags lzc_flags = 0;
FILE *fout = (flags->verbosity > 0 && flags->dryrun) ? stdout : stderr;
uint64_t *redact_snap_guids = NULL;
int num_redact_snaps = 0;
char *redact_book = NULL;
(void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
"cannot resume send"));
if (flags->verbosity != 0) {
(void) fprintf(fout, dgettext(TEXT_DOMAIN,
"resume token contents:\n"));
nvlist_print(fout, resume_nvl);
}
if (nvlist_lookup_string(resume_nvl, "toname", &toname) != 0 ||
nvlist_lookup_uint64(resume_nvl, "object", &resumeobj) != 0 ||
nvlist_lookup_uint64(resume_nvl, "offset", &resumeoff) != 0 ||
nvlist_lookup_uint64(resume_nvl, "bytes", &bytes) != 0 ||
nvlist_lookup_uint64(resume_nvl, "toguid", &toguid) != 0) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"resume token is corrupt"));
return (zfs_error(hdl, EZFS_FAULT, errbuf));
}
fromguid = 0;
(void) nvlist_lookup_uint64(resume_nvl, "fromguid", &fromguid);
if (flags->largeblock || nvlist_exists(resume_nvl, "largeblockok"))
lzc_flags |= LZC_SEND_FLAG_LARGE_BLOCK;
if (flags->embed_data || nvlist_exists(resume_nvl, "embedok"))
lzc_flags |= LZC_SEND_FLAG_EMBED_DATA;
if (flags->compress || nvlist_exists(resume_nvl, "compressok"))
lzc_flags |= LZC_SEND_FLAG_COMPRESS;
if (flags->raw || nvlist_exists(resume_nvl, "rawok"))
lzc_flags |= LZC_SEND_FLAG_RAW;
if (flags->saved || nvlist_exists(resume_nvl, "savedok"))
lzc_flags |= LZC_SEND_FLAG_SAVED;
if (flags->saved) {
(void) strcpy(name, toname);
} else {
error = guid_to_name(hdl, toname, toguid, B_FALSE, name);
if (error != 0) {
if (zfs_dataset_exists(hdl, toname, ZFS_TYPE_DATASET)) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"'%s' is no longer the same snapshot "
"used in the initial send"), toname);
} else {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"'%s' used in the initial send no "
"longer exists"), toname);
}
return (zfs_error(hdl, EZFS_BADPATH, errbuf));
}
}
zhp = zfs_open(hdl, name, ZFS_TYPE_DATASET);
if (zhp == NULL) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"unable to access '%s'"), name);
return (zfs_error(hdl, EZFS_BADPATH, errbuf));
}
if (nvlist_lookup_uint64_array(resume_nvl, "book_redact_snaps",
&redact_snap_guids, (uint_t *)&num_redact_snaps) != 0) {
num_redact_snaps = -1;
}
if (fromguid != 0) {
if (guid_to_name_redact_snaps(hdl, toname, fromguid, B_TRUE,
redact_snap_guids, num_redact_snaps, name) != 0) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"incremental source %#llx no longer exists"),
(longlong_t)fromguid);
return (zfs_error(hdl, EZFS_BADPATH, errbuf));
}
fromname = name;
}
redact_snap_guids = NULL;
if (nvlist_lookup_uint64_array(resume_nvl,
zfs_prop_to_name(ZFS_PROP_REDACT_SNAPS), &redact_snap_guids,
(uint_t *)&num_redact_snaps) == 0) {
char path[ZFS_MAX_DATASET_NAME_LEN];
(void) strlcpy(path, toname, sizeof (path));
char *at = strchr(path, '@');
ASSERT3P(at, !=, NULL);
*at = '\0';
if ((error = find_redact_book(hdl, path, redact_snap_guids,
num_redact_snaps, &redact_book)) != 0) {
return (error);
}
}
if (flags->verbosity != 0) {
/*
* Some of these may have come from the resume token, set them
* here for size estimate purposes.
*/
sendflags_t tmpflags = *flags;
if (lzc_flags & LZC_SEND_FLAG_LARGE_BLOCK)
tmpflags.largeblock = B_TRUE;
if (lzc_flags & LZC_SEND_FLAG_COMPRESS)
tmpflags.compress = B_TRUE;
if (lzc_flags & LZC_SEND_FLAG_EMBED_DATA)
tmpflags.embed_data = B_TRUE;
error = estimate_size(zhp, fromname, outfd, &tmpflags,
resumeobj, resumeoff, bytes, redact_book, errbuf);
}
if (!flags->dryrun) {
progress_arg_t pa = { 0 };
pthread_t tid;
/*
* If progress reporting is requested, spawn a new thread to
* poll ZFS_IOC_SEND_PROGRESS at a regular interval.
*/
if (flags->progress) {
pa.pa_zhp = zhp;
pa.pa_fd = outfd;
pa.pa_parsable = flags->parsable;
pa.pa_estimate = B_FALSE;
pa.pa_verbosity = flags->verbosity;
error = pthread_create(&tid, NULL,
send_progress_thread, &pa);
if (error != 0) {
if (redact_book != NULL)
free(redact_book);
zfs_close(zhp);
return (error);
}
}
error = lzc_send_resume_redacted(zhp->zfs_name, fromname, outfd,
lzc_flags, resumeobj, resumeoff, redact_book);
if (redact_book != NULL)
free(redact_book);
if (flags->progress) {
void *status = NULL;
(void) pthread_cancel(tid);
(void) pthread_join(tid, &status);
int error = (int)(uintptr_t)status;
if (error != 0 && status != PTHREAD_CANCELED) {
char errbuf[1024];
(void) snprintf(errbuf, sizeof (errbuf),
dgettext(TEXT_DOMAIN,
"progress thread exited nonzero"));
return (zfs_standard_error(hdl, error, errbuf));
}
}
char errbuf[1024];
(void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
"warning: cannot send '%s'"), zhp->zfs_name);
zfs_close(zhp);
switch (error) {
case 0:
return (0);
case EACCES:
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"source key must be loaded"));
return (zfs_error(hdl, EZFS_CRYPTOFAILED, errbuf));
case ESRCH:
if (lzc_exists(zhp->zfs_name)) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"incremental source could not be found"));
}
return (zfs_error(hdl, EZFS_NOENT, errbuf));
case EXDEV:
case ENOENT:
case EDQUOT:
case EFBIG:
case EIO:
case ENOLINK:
case ENOSPC:
case ENOSTR:
case ENXIO:
case EPIPE:
case ERANGE:
case EFAULT:
case EROFS:
zfs_error_aux(hdl, strerror(errno));
return (zfs_error(hdl, EZFS_BADBACKUP, errbuf));
default:
return (zfs_standard_error(hdl, errno, errbuf));
}
} else {
if (redact_book != NULL)
free(redact_book);
}
zfs_close(zhp);
return (error);
}
int
zfs_send_resume(libzfs_handle_t *hdl, sendflags_t *flags, int outfd,
const char *resume_token)
{
int ret;
char errbuf[1024];
nvlist_t *resume_nvl;
(void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
"cannot resume send"));
resume_nvl = zfs_send_resume_token_to_nvlist(hdl, resume_token);
if (resume_nvl == NULL) {
/*
* zfs_error_aux has already been set by
* zfs_send_resume_token_to_nvlist()
*/
return (zfs_error(hdl, EZFS_FAULT, errbuf));
}
ret = zfs_send_resume_impl(hdl, flags, outfd, resume_nvl);
nvlist_free(resume_nvl);
return (ret);
}
int
zfs_send_saved(zfs_handle_t *zhp, sendflags_t *flags, int outfd,
const char *resume_token)
{
int ret;
libzfs_handle_t *hdl = zhp->zfs_hdl;
nvlist_t *saved_nvl = NULL, *resume_nvl = NULL;
uint64_t saved_guid = 0, resume_guid = 0;
uint64_t obj = 0, off = 0, bytes = 0;
char token_buf[ZFS_MAXPROPLEN];
char errbuf[1024];
(void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
"saved send failed"));
ret = zfs_prop_get(zhp, ZFS_PROP_RECEIVE_RESUME_TOKEN,
token_buf, sizeof (token_buf), NULL, NULL, 0, B_TRUE);
if (ret != 0)
goto out;
saved_nvl = zfs_send_resume_token_to_nvlist(hdl, token_buf);
if (saved_nvl == NULL) {
/*
* zfs_error_aux has already been set by
* zfs_send_resume_token_to_nvlist()
*/
ret = zfs_error(hdl, EZFS_FAULT, errbuf);
goto out;
}
/*
* If a resume token is provided we use the object and offset
* from that instead of the default, which starts from the
* beginning.
*/
if (resume_token != NULL) {
resume_nvl = zfs_send_resume_token_to_nvlist(hdl,
resume_token);
if (resume_nvl == NULL) {
ret = zfs_error(hdl, EZFS_FAULT, errbuf);
goto out;
}
if (nvlist_lookup_uint64(resume_nvl, "object", &obj) != 0 ||
nvlist_lookup_uint64(resume_nvl, "offset", &off) != 0 ||
nvlist_lookup_uint64(resume_nvl, "bytes", &bytes) != 0 ||
nvlist_lookup_uint64(resume_nvl, "toguid",
&resume_guid) != 0) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"provided resume token is corrupt"));
ret = zfs_error(hdl, EZFS_FAULT, errbuf);
goto out;
}
if (nvlist_lookup_uint64(saved_nvl, "toguid",
&saved_guid)) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"dataset's resume token is corrupt"));
ret = zfs_error(hdl, EZFS_FAULT, errbuf);
goto out;
}
if (resume_guid != saved_guid) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"provided resume token does not match dataset"));
ret = zfs_error(hdl, EZFS_BADBACKUP, errbuf);
goto out;
}
}
(void) nvlist_remove_all(saved_nvl, "object");
fnvlist_add_uint64(saved_nvl, "object", obj);
(void) nvlist_remove_all(saved_nvl, "offset");
fnvlist_add_uint64(saved_nvl, "offset", off);
(void) nvlist_remove_all(saved_nvl, "bytes");
fnvlist_add_uint64(saved_nvl, "bytes", bytes);
(void) nvlist_remove_all(saved_nvl, "toname");
fnvlist_add_string(saved_nvl, "toname", zhp->zfs_name);
ret = zfs_send_resume_impl(hdl, flags, outfd, saved_nvl);
out:
nvlist_free(saved_nvl);
nvlist_free(resume_nvl);
return (ret);
}
/*
* This function informs the target system that the recursive send is complete.
* The record is also expected in the case of a send -p.
*/
static int
send_conclusion_record(int fd, zio_cksum_t *zc)
{
dmu_replay_record_t drr = { 0 };
drr.drr_type = DRR_END;
if (zc != NULL)
drr.drr_u.drr_end.drr_checksum = *zc;
if (write(fd, &drr, sizeof (drr)) == -1) {
return (errno);
}
return (0);
}
/*
* This function is responsible for sending the records that contain the
* necessary information for the target system's libzfs to be able to set the
* properties of the filesystem being received, or to be able to prepare for
* a recursive receive.
*
* The "zhp" argument is the handle of the snapshot we are sending
* (the "tosnap"). The "from" argument is the short snapshot name (the part
* after the @) of the incremental source.
*/
static int
send_prelim_records(zfs_handle_t *zhp, const char *from, int fd,
boolean_t gather_props, boolean_t recursive, boolean_t verbose,
boolean_t dryrun, boolean_t raw, boolean_t replicate, boolean_t backup,
boolean_t holds, boolean_t props, boolean_t doall,
nvlist_t **fssp, avl_tree_t **fsavlp)
{
int err = 0;
char *packbuf = NULL;
size_t buflen = 0;
zio_cksum_t zc = { {0} };
int featureflags = 0;
/* name of filesystem/volume that contains snapshot we are sending */
char tofs[ZFS_MAX_DATASET_NAME_LEN];
/* short name of snap we are sending */
char *tosnap = "";
char errbuf[1024];
(void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
"warning: cannot send '%s'"), zhp->zfs_name);
if (zhp->zfs_type == ZFS_TYPE_FILESYSTEM && zfs_prop_get_int(zhp,
ZFS_PROP_VERSION) >= ZPL_VERSION_SA) {
featureflags |= DMU_BACKUP_FEATURE_SA_SPILL;
}
if (holds)
featureflags |= DMU_BACKUP_FEATURE_HOLDS;
(void) strlcpy(tofs, zhp->zfs_name, ZFS_MAX_DATASET_NAME_LEN);
char *at = strchr(tofs, '@');
if (at != NULL) {
*at = '\0';
tosnap = at + 1;
}
if (gather_props) {
nvlist_t *hdrnv = fnvlist_alloc();
nvlist_t *fss = NULL;
if (from != NULL)
fnvlist_add_string(hdrnv, "fromsnap", from);
fnvlist_add_string(hdrnv, "tosnap", tosnap);
if (!recursive)
fnvlist_add_boolean(hdrnv, "not_recursive");
if (raw) {
VERIFY0(nvlist_add_boolean(hdrnv, "raw"));
}
if ((err = gather_nvlist(zhp->zfs_hdl, tofs,
from, tosnap, recursive, raw, doall, replicate, verbose,
backup, holds, props, &fss, fsavlp)) != 0) {
return (zfs_error(zhp->zfs_hdl, EZFS_BADBACKUP,
errbuf));
}
/*
* Do not allow the size of the properties list to exceed
* the limit
*/
if ((fnvlist_size(fss) + fnvlist_size(hdrnv)) >
zhp->zfs_hdl->libzfs_max_nvlist) {
(void) snprintf(errbuf, sizeof (errbuf),
dgettext(TEXT_DOMAIN, "warning: cannot send '%s': "
"the size of the list of snapshots and properties "
"is too large to be received successfully.\n"
"Select a smaller number of snapshots to send.\n"),
zhp->zfs_name);
return (zfs_error(zhp->zfs_hdl, EZFS_NOSPC,
errbuf));
}
fnvlist_add_nvlist(hdrnv, "fss", fss);
VERIFY0(nvlist_pack(hdrnv, &packbuf, &buflen, NV_ENCODE_XDR,
0));
if (fssp != NULL) {
*fssp = fss;
} else {
nvlist_free(fss);
}
nvlist_free(hdrnv);
}
if (!dryrun) {
dmu_replay_record_t drr = { 0 };
/* write first begin record */
drr.drr_type = DRR_BEGIN;
drr.drr_u.drr_begin.drr_magic = DMU_BACKUP_MAGIC;
DMU_SET_STREAM_HDRTYPE(drr.drr_u.drr_begin.
drr_versioninfo, DMU_COMPOUNDSTREAM);
DMU_SET_FEATUREFLAGS(drr.drr_u.drr_begin.
drr_versioninfo, featureflags);
if (snprintf(drr.drr_u.drr_begin.drr_toname,
sizeof (drr.drr_u.drr_begin.drr_toname), "%s@%s", tofs,
tosnap) >= sizeof (drr.drr_u.drr_begin.drr_toname)) {
return (zfs_error(zhp->zfs_hdl, EZFS_BADBACKUP,
errbuf));
}
drr.drr_payloadlen = buflen;
err = dump_record(&drr, packbuf, buflen, &zc, fd);
free(packbuf);
if (err != 0) {
zfs_error_aux(zhp->zfs_hdl, strerror(err));
return (zfs_error(zhp->zfs_hdl, EZFS_BADBACKUP,
errbuf));
}
err = send_conclusion_record(fd, &zc);
if (err != 0) {
zfs_error_aux(zhp->zfs_hdl, strerror(err));
return (zfs_error(zhp->zfs_hdl, EZFS_BADBACKUP,
errbuf));
}
}
return (0);
}
/*
* Generate a send stream. The "zhp" argument is the filesystem/volume
* that contains the snapshot to send. The "fromsnap" argument is the
* short name (the part after the '@') of the snapshot that is the
* incremental source to send from (if non-NULL). The "tosnap" argument
* is the short name of the snapshot to send.
*
* The content of the send stream is the snapshot identified by
* 'tosnap'. Incremental streams are requested in two ways:
* - from the snapshot identified by "fromsnap" (if non-null) or
* - from the origin of the dataset identified by zhp, which must
* be a clone. In this case, "fromsnap" is null and "fromorigin"
* is TRUE.
*
* The send stream is recursive (i.e. dumps a hierarchy of snapshots) and
* uses a special header (with a hdrtype field of DMU_COMPOUNDSTREAM)
* if "replicate" is set. If "doall" is set, dump all the intermediate
* snapshots. The DMU_COMPOUNDSTREAM header is used in the "doall"
* case too. If "props" is set, send properties.
*/
int
zfs_send(zfs_handle_t *zhp, const char *fromsnap, const char *tosnap,
sendflags_t *flags, int outfd, snapfilter_cb_t filter_func,
void *cb_arg, nvlist_t **debugnvp)
{
char errbuf[1024];
send_dump_data_t sdd = { 0 };
int err = 0;
nvlist_t *fss = NULL;
avl_tree_t *fsavl = NULL;
static uint64_t holdseq;
int spa_version;
pthread_t tid = 0;
int pipefd[2];
int featureflags = 0;
FILE *fout;
(void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
"cannot send '%s'"), zhp->zfs_name);
if (fromsnap && fromsnap[0] == '\0') {
zfs_error_aux(zhp->zfs_hdl, dgettext(TEXT_DOMAIN,
"zero-length incremental source"));
return (zfs_error(zhp->zfs_hdl, EZFS_NOENT, errbuf));
}
if (zhp->zfs_type == ZFS_TYPE_FILESYSTEM) {
uint64_t version;
version = zfs_prop_get_int(zhp, ZFS_PROP_VERSION);
if (version >= ZPL_VERSION_SA) {
featureflags |= DMU_BACKUP_FEATURE_SA_SPILL;
}
}
if (flags->holds)
featureflags |= DMU_BACKUP_FEATURE_HOLDS;
if (flags->replicate || flags->doall || flags->props ||
flags->holds || flags->backup) {
char full_tosnap_name[ZFS_MAX_DATASET_NAME_LEN];
if (snprintf(full_tosnap_name, sizeof (full_tosnap_name),
"%s@%s", zhp->zfs_name, tosnap) >=
sizeof (full_tosnap_name)) {
err = EINVAL;
goto stderr_out;
}
zfs_handle_t *tosnap = zfs_open(zhp->zfs_hdl,
full_tosnap_name, ZFS_TYPE_SNAPSHOT);
if (tosnap == NULL) {
err = -1;
goto err_out;
}
err = send_prelim_records(tosnap, fromsnap, outfd,
flags->replicate || flags->props || flags->holds,
flags->replicate, flags->verbosity > 0, flags->dryrun,
flags->raw, flags->replicate, flags->backup, flags->holds,
flags->props, flags->doall, &fss, &fsavl);
zfs_close(tosnap);
if (err != 0)
goto err_out;
}
/* dump each stream */
sdd.fromsnap = fromsnap;
sdd.tosnap = tosnap;
if (tid != 0)
sdd.outfd = pipefd[0];
else
sdd.outfd = outfd;
sdd.replicate = flags->replicate;
sdd.doall = flags->doall;
sdd.fromorigin = flags->fromorigin;
sdd.fss = fss;
sdd.fsavl = fsavl;
sdd.verbosity = flags->verbosity;
sdd.parsable = flags->parsable;
sdd.progress = flags->progress;
sdd.dryrun = flags->dryrun;
sdd.large_block = flags->largeblock;
sdd.embed_data = flags->embed_data;
sdd.compress = flags->compress;
sdd.raw = flags->raw;
sdd.holds = flags->holds;
sdd.filter_cb = filter_func;
sdd.filter_cb_arg = cb_arg;
if (debugnvp)
sdd.debugnv = *debugnvp;
if (sdd.verbosity != 0 && sdd.dryrun)
sdd.std_out = B_TRUE;
fout = sdd.std_out ? stdout : stderr;
/*
* Some flags require that we place user holds on the datasets that are
* being sent so they don't get destroyed during the send. We can skip
* this step if the pool is imported read-only since the datasets cannot
* be destroyed.
*/
if (!flags->dryrun && !zpool_get_prop_int(zfs_get_pool_handle(zhp),
ZPOOL_PROP_READONLY, NULL) &&
zfs_spa_version(zhp, &spa_version) == 0 &&
spa_version >= SPA_VERSION_USERREFS &&
(flags->doall || flags->replicate)) {
++holdseq;
(void) snprintf(sdd.holdtag, sizeof (sdd.holdtag),
".send-%d-%llu", getpid(), (u_longlong_t)holdseq);
sdd.cleanup_fd = open(ZFS_DEV, O_RDWR);
if (sdd.cleanup_fd < 0) {
err = errno;
goto stderr_out;
}
sdd.snapholds = fnvlist_alloc();
} else {
sdd.cleanup_fd = -1;
sdd.snapholds = NULL;
}
if (flags->verbosity != 0 || sdd.snapholds != NULL) {
/*
* Do a verbose no-op dry run to get all the verbose output
* or to gather snapshot hold's before generating any data,
* then do a non-verbose real run to generate the streams.
*/
sdd.dryrun = B_TRUE;
err = dump_filesystems(zhp, &sdd);
if (err != 0)
goto stderr_out;
if (flags->verbosity != 0) {
if (flags->parsable) {
(void) fprintf(fout, "size\t%llu\n",
(longlong_t)sdd.size);
} else {
char buf[16];
zfs_nicebytes(sdd.size, buf, sizeof (buf));
(void) fprintf(fout, dgettext(TEXT_DOMAIN,
"total estimated size is %s\n"), buf);
}
}
/* Ensure no snaps found is treated as an error. */
if (!sdd.seento) {
err = ENOENT;
goto err_out;
}
/* Skip the second run if dryrun was requested. */
if (flags->dryrun)
goto err_out;
if (sdd.snapholds != NULL) {
err = zfs_hold_nvl(zhp, sdd.cleanup_fd, sdd.snapholds);
if (err != 0)
goto stderr_out;
fnvlist_free(sdd.snapholds);
sdd.snapholds = NULL;
}
sdd.dryrun = B_FALSE;
sdd.verbosity = 0;
}
err = dump_filesystems(zhp, &sdd);
fsavl_destroy(fsavl);
nvlist_free(fss);
/* Ensure no snaps found is treated as an error. */
if (err == 0 && !sdd.seento)
err = ENOENT;
if (tid != 0) {
if (err != 0)
(void) pthread_cancel(tid);
(void) close(pipefd[0]);
(void) pthread_join(tid, NULL);
}
if (sdd.cleanup_fd != -1) {
VERIFY(0 == close(sdd.cleanup_fd));
sdd.cleanup_fd = -1;
}
if (!flags->dryrun && (flags->replicate || flags->doall ||
flags->props || flags->backup || flags->holds)) {
/*
* write final end record. NB: want to do this even if
* there was some error, because it might not be totally
* failed.
*/
err = send_conclusion_record(outfd, NULL);
if (err != 0)
return (zfs_standard_error(zhp->zfs_hdl, err, errbuf));
}
return (err || sdd.err);
stderr_out:
err = zfs_standard_error(zhp->zfs_hdl, err, errbuf);
err_out:
fsavl_destroy(fsavl);
nvlist_free(fss);
fnvlist_free(sdd.snapholds);
if (sdd.cleanup_fd != -1)
VERIFY(0 == close(sdd.cleanup_fd));
if (tid != 0) {
(void) pthread_cancel(tid);
(void) close(pipefd[0]);
(void) pthread_join(tid, NULL);
}
return (err);
}
static zfs_handle_t *
name_to_dir_handle(libzfs_handle_t *hdl, const char *snapname)
{
char dirname[ZFS_MAX_DATASET_NAME_LEN];
(void) strlcpy(dirname, snapname, ZFS_MAX_DATASET_NAME_LEN);
char *c = strchr(dirname, '@');
if (c != NULL)
*c = '\0';
return (zfs_open(hdl, dirname, ZFS_TYPE_DATASET));
}
/*
* Returns B_TRUE if earlier is an earlier snapshot in later's timeline; either
* an earlier snapshot in the same filesystem, or a snapshot before later's
* origin, or it's origin's origin, etc.
*/
static boolean_t
snapshot_is_before(zfs_handle_t *earlier, zfs_handle_t *later)
{
boolean_t ret;
uint64_t later_txg =
(later->zfs_type == ZFS_TYPE_FILESYSTEM ||
later->zfs_type == ZFS_TYPE_VOLUME ?
UINT64_MAX : zfs_prop_get_int(later, ZFS_PROP_CREATETXG));
uint64_t earlier_txg = zfs_prop_get_int(earlier, ZFS_PROP_CREATETXG);
if (earlier_txg >= later_txg)
return (B_FALSE);
zfs_handle_t *earlier_dir = name_to_dir_handle(earlier->zfs_hdl,
earlier->zfs_name);
zfs_handle_t *later_dir = name_to_dir_handle(later->zfs_hdl,
later->zfs_name);
if (strcmp(earlier_dir->zfs_name, later_dir->zfs_name) == 0) {
zfs_close(earlier_dir);
zfs_close(later_dir);
return (B_TRUE);
}
char clonename[ZFS_MAX_DATASET_NAME_LEN];
if (zfs_prop_get(later_dir, ZFS_PROP_ORIGIN, clonename,
ZFS_MAX_DATASET_NAME_LEN, NULL, NULL, 0, B_TRUE) != 0) {
zfs_close(earlier_dir);
zfs_close(later_dir);
return (B_FALSE);
}
zfs_handle_t *origin = zfs_open(earlier->zfs_hdl, clonename,
ZFS_TYPE_DATASET);
uint64_t origin_txg = zfs_prop_get_int(origin, ZFS_PROP_CREATETXG);
/*
* If "earlier" is exactly the origin, then
* snapshot_is_before(earlier, origin) will return false (because
* they're the same).
*/
if (origin_txg == earlier_txg &&
strcmp(origin->zfs_name, earlier->zfs_name) == 0) {
zfs_close(earlier_dir);
zfs_close(later_dir);
zfs_close(origin);
return (B_TRUE);
}
zfs_close(earlier_dir);
zfs_close(later_dir);
ret = snapshot_is_before(earlier, origin);
zfs_close(origin);
return (ret);
}
/*
* The "zhp" argument is the handle of the dataset to send (typically a
* snapshot). The "from" argument is the full name of the snapshot or
* bookmark that is the incremental source.
*/
int
zfs_send_one(zfs_handle_t *zhp, const char *from, int fd, sendflags_t *flags,
const char *redactbook)
{
int err;
libzfs_handle_t *hdl = zhp->zfs_hdl;
char *name = zhp->zfs_name;
int orig_fd = fd;
pthread_t ptid;
progress_arg_t pa = { 0 };
char errbuf[1024];
(void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
"warning: cannot send '%s'"), name);
if (from != NULL && strchr(from, '@')) {
zfs_handle_t *from_zhp = zfs_open(hdl, from,
ZFS_TYPE_DATASET);
if (from_zhp == NULL)
return (-1);
if (!snapshot_is_before(from_zhp, zhp)) {
zfs_close(from_zhp);
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"not an earlier snapshot from the same fs"));
return (zfs_error(hdl, EZFS_CROSSTARGET, errbuf));
}
zfs_close(from_zhp);
}
if (redactbook != NULL) {
char bookname[ZFS_MAX_DATASET_NAME_LEN];
nvlist_t *redact_snaps;
zfs_handle_t *book_zhp;
char *at, *pound;
int dsnamelen;
pound = strchr(redactbook, '#');
if (pound != NULL)
redactbook = pound + 1;
at = strchr(name, '@');
if (at == NULL) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"cannot do a redacted send to a filesystem"));
return (zfs_error(hdl, EZFS_BADTYPE, errbuf));
}
dsnamelen = at - name;
if (snprintf(bookname, sizeof (bookname), "%.*s#%s",
dsnamelen, name, redactbook)
>= sizeof (bookname)) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"invalid bookmark name"));
return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf));
}
book_zhp = zfs_open(hdl, bookname, ZFS_TYPE_BOOKMARK);
if (book_zhp == NULL)
return (-1);
if (nvlist_lookup_nvlist(book_zhp->zfs_props,
zfs_prop_to_name(ZFS_PROP_REDACT_SNAPS),
&redact_snaps) != 0 || redact_snaps == NULL) {
zfs_close(book_zhp);
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"not a redaction bookmark"));
return (zfs_error(hdl, EZFS_BADTYPE, errbuf));
}
zfs_close(book_zhp);
}
/*
* Send fs properties
*/
if (flags->props || flags->holds || flags->backup) {
/*
* Note: the header generated by send_prelim_records()
* assumes that the incremental source is in the same
* filesystem/volume as the target (which is a requirement
* when doing "zfs send -R"). But that isn't always the
* case here (e.g. send from snap in origin, or send from
* bookmark). We pass from=NULL, which will omit this
* information from the prelim records; it isn't used
* when receiving this type of stream.
*/
err = send_prelim_records(zhp, NULL, fd, B_TRUE, B_FALSE,
flags->verbosity > 0, flags->dryrun, flags->raw,
flags->replicate, flags->backup, flags->holds,
flags->props, flags->doall, NULL, NULL);
if (err != 0)
return (err);
}
/*
* Perform size estimate if verbose was specified.
*/
if (flags->verbosity != 0) {
err = estimate_size(zhp, from, fd, flags, 0, 0, 0, redactbook,
errbuf);
if (err != 0)
return (err);
}
if (flags->dryrun)
return (0);
/*
* If progress reporting is requested, spawn a new thread to poll
* ZFS_IOC_SEND_PROGRESS at a regular interval.
*/
if (flags->progress) {
pa.pa_zhp = zhp;
pa.pa_fd = fd;
pa.pa_parsable = flags->parsable;
pa.pa_estimate = B_FALSE;
pa.pa_verbosity = flags->verbosity;
err = pthread_create(&ptid, NULL,
send_progress_thread, &pa);
if (err != 0) {
zfs_error_aux(zhp->zfs_hdl, strerror(errno));
return (zfs_error(zhp->zfs_hdl,
EZFS_THREADCREATEFAILED, errbuf));
}
}
err = lzc_send_redacted(name, from, fd,
lzc_flags_from_sendflags(flags), redactbook);
if (flags->progress) {
void *status = NULL;
if (err != 0)
(void) pthread_cancel(ptid);
(void) pthread_join(ptid, &status);
int error = (int)(uintptr_t)status;
if (error != 0 && status != PTHREAD_CANCELED) {
char errbuf[1024];
(void) snprintf(errbuf, sizeof (errbuf),
dgettext(TEXT_DOMAIN, "progress thread exited "
"nonzero"));
return (zfs_standard_error(hdl, error, errbuf));
}
}
if (flags->props || flags->holds || flags->backup) {
/* Write the final end record. */
err = send_conclusion_record(orig_fd, NULL);
if (err != 0)
return (zfs_standard_error(hdl, err, errbuf));
}
if (err != 0) {
switch (errno) {
case EXDEV:
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"not an earlier snapshot from the same fs"));
return (zfs_error(hdl, EZFS_CROSSTARGET, errbuf));
case ENOENT:
case ESRCH:
if (lzc_exists(name)) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"incremental source (%s) does not exist"),
from);
}
return (zfs_error(hdl, EZFS_NOENT, errbuf));
case EACCES:
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"dataset key must be loaded"));
return (zfs_error(hdl, EZFS_CRYPTOFAILED, errbuf));
case EBUSY:
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"target is busy; if a filesystem, "
"it must not be mounted"));
return (zfs_error(hdl, EZFS_BUSY, errbuf));
case EDQUOT:
case EFAULT:
case EFBIG:
case EINVAL:
case EIO:
case ENOLINK:
case ENOSPC:
case ENOSTR:
case ENXIO:
case EPIPE:
case ERANGE:
case EROFS:
zfs_error_aux(hdl, strerror(errno));
return (zfs_error(hdl, EZFS_BADBACKUP, errbuf));
default:
return (zfs_standard_error(hdl, errno, errbuf));
}
}
return (err != 0);
}
/*
* Routines specific to "zfs recv"
*/
static int
recv_read(libzfs_handle_t *hdl, int fd, void *buf, int ilen,
boolean_t byteswap, zio_cksum_t *zc)
{
char *cp = buf;
int rv;
int len = ilen;
do {
rv = read(fd, cp, len);
cp += rv;
len -= rv;
} while (rv > 0);
if (rv < 0 || len != 0) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"failed to read from stream"));
return (zfs_error(hdl, EZFS_BADSTREAM, dgettext(TEXT_DOMAIN,
"cannot receive")));
}
if (zc) {
if (byteswap)
fletcher_4_incremental_byteswap(buf, ilen, zc);
else
fletcher_4_incremental_native(buf, ilen, zc);
}
return (0);
}
static int
recv_read_nvlist(libzfs_handle_t *hdl, int fd, int len, nvlist_t **nvp,
boolean_t byteswap, zio_cksum_t *zc)
{
char *buf;
int err;
buf = zfs_alloc(hdl, len);
if (buf == NULL)
return (ENOMEM);
if (len > hdl->libzfs_max_nvlist) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "nvlist too large"));
free(buf);
return (ENOMEM);
}
err = recv_read(hdl, fd, buf, len, byteswap, zc);
if (err != 0) {
free(buf);
return (err);
}
err = nvlist_unpack(buf, len, nvp, 0);
free(buf);
if (err != 0) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "invalid "
"stream (malformed nvlist)"));
return (EINVAL);
}
return (0);
}
/*
* Returns the grand origin (origin of origin of origin...) of a given handle.
* If this dataset is not a clone, it simply returns a copy of the original
* handle.
*/
static zfs_handle_t *
recv_open_grand_origin(zfs_handle_t *zhp)
{
char origin[ZFS_MAX_DATASET_NAME_LEN];
zprop_source_t src;
zfs_handle_t *ozhp = zfs_handle_dup(zhp);
while (ozhp != NULL) {
if (zfs_prop_get(ozhp, ZFS_PROP_ORIGIN, origin,
sizeof (origin), &src, NULL, 0, B_FALSE) != 0)
break;
(void) zfs_close(ozhp);
ozhp = zfs_open(zhp->zfs_hdl, origin, ZFS_TYPE_FILESYSTEM);
}
return (ozhp);
}
static int
recv_rename_impl(zfs_handle_t *zhp, const char *name, const char *newname)
{
int err;
zfs_handle_t *ozhp = NULL;
/*
* Attempt to rename the dataset. If it fails with EACCES we have
* attempted to rename the dataset outside of its encryption root.
* Force the dataset to become an encryption root and try again.
*/
err = lzc_rename(name, newname);
if (err == EACCES) {
ozhp = recv_open_grand_origin(zhp);
if (ozhp == NULL) {
err = ENOENT;
goto out;
}
err = lzc_change_key(ozhp->zfs_name, DCP_CMD_FORCE_NEW_KEY,
NULL, NULL, 0);
if (err != 0)
goto out;
err = lzc_rename(name, newname);
}
out:
if (ozhp != NULL)
zfs_close(ozhp);
return (err);
}
static int
recv_rename(libzfs_handle_t *hdl, const char *name, const char *tryname,
int baselen, char *newname, recvflags_t *flags)
{
static int seq;
int err;
prop_changelist_t *clp = NULL;
zfs_handle_t *zhp = NULL;
zhp = zfs_open(hdl, name, ZFS_TYPE_DATASET);
if (zhp == NULL) {
err = -1;
goto out;
}
clp = changelist_gather(zhp, ZFS_PROP_NAME, 0,
flags->force ? MS_FORCE : 0);
if (clp == NULL) {
err = -1;
goto out;
}
err = changelist_prefix(clp);
if (err)
goto out;
if (tryname) {
(void) strcpy(newname, tryname);
if (flags->verbose) {
(void) printf("attempting rename %s to %s\n",
name, newname);
}
err = recv_rename_impl(zhp, name, newname);
if (err == 0)
changelist_rename(clp, name, tryname);
} else {
err = ENOENT;
}
if (err != 0 && strncmp(name + baselen, "recv-", 5) != 0) {
seq++;
(void) snprintf(newname, ZFS_MAX_DATASET_NAME_LEN,
"%.*srecv-%u-%u", baselen, name, getpid(), seq);
if (flags->verbose) {
(void) printf("failed - trying rename %s to %s\n",
name, newname);
}
err = recv_rename_impl(zhp, name, newname);
if (err == 0)
changelist_rename(clp, name, newname);
if (err && flags->verbose) {
(void) printf("failed (%u) - "
"will try again on next pass\n", errno);
}
err = EAGAIN;
} else if (flags->verbose) {
if (err == 0)
(void) printf("success\n");
else
(void) printf("failed (%u)\n", errno);
}
(void) changelist_postfix(clp);
out:
if (clp != NULL)
changelist_free(clp);
if (zhp != NULL)
zfs_close(zhp);
return (err);
}
static int
recv_promote(libzfs_handle_t *hdl, const char *fsname,
const char *origin_fsname, recvflags_t *flags)
{
int err;
zfs_cmd_t zc = {"\0"};
zfs_handle_t *zhp = NULL, *ozhp = NULL;
if (flags->verbose)
(void) printf("promoting %s\n", fsname);
(void) strlcpy(zc.zc_value, origin_fsname, sizeof (zc.zc_value));
(void) strlcpy(zc.zc_name, fsname, sizeof (zc.zc_name));
/*
* Attempt to promote the dataset. If it fails with EACCES the
* promotion would cause this dataset to leave its encryption root.
* Force the origin to become an encryption root and try again.
*/
err = zfs_ioctl(hdl, ZFS_IOC_PROMOTE, &zc);
if (err == EACCES) {
zhp = zfs_open(hdl, fsname, ZFS_TYPE_DATASET);
if (zhp == NULL) {
err = -1;
goto out;
}
ozhp = recv_open_grand_origin(zhp);
if (ozhp == NULL) {
err = -1;
goto out;
}
err = lzc_change_key(ozhp->zfs_name, DCP_CMD_FORCE_NEW_KEY,
NULL, NULL, 0);
if (err != 0)
goto out;
err = zfs_ioctl(hdl, ZFS_IOC_PROMOTE, &zc);
}
out:
if (zhp != NULL)
zfs_close(zhp);
if (ozhp != NULL)
zfs_close(ozhp);
return (err);
}
static int
recv_destroy(libzfs_handle_t *hdl, const char *name, int baselen,
char *newname, recvflags_t *flags)
{
int err = 0;
prop_changelist_t *clp;
zfs_handle_t *zhp;
boolean_t defer = B_FALSE;
int spa_version;
zhp = zfs_open(hdl, name, ZFS_TYPE_DATASET);
if (zhp == NULL)
return (-1);
clp = changelist_gather(zhp, ZFS_PROP_NAME, 0,
flags->force ? MS_FORCE : 0);
if (zfs_get_type(zhp) == ZFS_TYPE_SNAPSHOT &&
zfs_spa_version(zhp, &spa_version) == 0 &&
spa_version >= SPA_VERSION_USERREFS)
defer = B_TRUE;
zfs_close(zhp);
if (clp == NULL)
return (-1);
err = changelist_prefix(clp);
if (err)
return (err);
if (flags->verbose)
(void) printf("attempting destroy %s\n", name);
if (zhp->zfs_type == ZFS_TYPE_SNAPSHOT) {
nvlist_t *nv = fnvlist_alloc();
fnvlist_add_boolean(nv, name);
err = lzc_destroy_snaps(nv, defer, NULL);
fnvlist_free(nv);
} else {
err = lzc_destroy(name);
}
if (err == 0) {
if (flags->verbose)
(void) printf("success\n");
changelist_remove(clp, name);
}
(void) changelist_postfix(clp);
changelist_free(clp);
/*
* Deferred destroy might destroy the snapshot or only mark it to be
* destroyed later, and it returns success in either case.
*/
if (err != 0 || (defer && zfs_dataset_exists(hdl, name,
ZFS_TYPE_SNAPSHOT))) {
err = recv_rename(hdl, name, NULL, baselen, newname, flags);
}
return (err);
}
typedef struct guid_to_name_data {
uint64_t guid;
boolean_t bookmark_ok;
char *name;
char *skip;
uint64_t *redact_snap_guids;
uint64_t num_redact_snaps;
} guid_to_name_data_t;
static boolean_t
redact_snaps_match(zfs_handle_t *zhp, guid_to_name_data_t *gtnd)
{
uint64_t *bmark_snaps;
uint_t bmark_num_snaps;
nvlist_t *nvl;
if (zhp->zfs_type != ZFS_TYPE_BOOKMARK)
return (B_FALSE);
nvl = fnvlist_lookup_nvlist(zhp->zfs_props,
zfs_prop_to_name(ZFS_PROP_REDACT_SNAPS));
bmark_snaps = fnvlist_lookup_uint64_array(nvl, ZPROP_VALUE,
&bmark_num_snaps);
if (bmark_num_snaps != gtnd->num_redact_snaps)
return (B_FALSE);
int i = 0;
for (; i < bmark_num_snaps; i++) {
int j = 0;
for (; j < bmark_num_snaps; j++) {
if (bmark_snaps[i] == gtnd->redact_snap_guids[j])
break;
}
if (j == bmark_num_snaps)
break;
}
return (i == bmark_num_snaps);
}
static int
guid_to_name_cb(zfs_handle_t *zhp, void *arg)
{
guid_to_name_data_t *gtnd = arg;
const char *slash;
int err;
if (gtnd->skip != NULL &&
(slash = strrchr(zhp->zfs_name, '/')) != NULL &&
strcmp(slash + 1, gtnd->skip) == 0) {
zfs_close(zhp);
return (0);
}
if (zfs_prop_get_int(zhp, ZFS_PROP_GUID) == gtnd->guid &&
(gtnd->num_redact_snaps == -1 || redact_snaps_match(zhp, gtnd))) {
(void) strcpy(gtnd->name, zhp->zfs_name);
zfs_close(zhp);
return (EEXIST);
}
err = zfs_iter_children(zhp, guid_to_name_cb, gtnd);
if (err != EEXIST && gtnd->bookmark_ok)
err = zfs_iter_bookmarks(zhp, guid_to_name_cb, gtnd);
zfs_close(zhp);
return (err);
}
/*
* Attempt to find the local dataset associated with this guid. In the case of
* multiple matches, we attempt to find the "best" match by searching
* progressively larger portions of the hierarchy. This allows one to send a
* tree of datasets individually and guarantee that we will find the source
* guid within that hierarchy, even if there are multiple matches elsewhere.
*
* If num_redact_snaps is not -1, we attempt to find a redaction bookmark with
* the specified number of redaction snapshots. If num_redact_snaps isn't 0 or
* -1, then redact_snap_guids will be an array of the guids of the snapshots the
* redaction bookmark was created with. If num_redact_snaps is -1, then we will
* attempt to find a snapshot or bookmark (if bookmark_ok is passed) with the
* given guid. Note that a redaction bookmark can be returned if
* num_redact_snaps == -1.
*/
static int
guid_to_name_redact_snaps(libzfs_handle_t *hdl, const char *parent,
uint64_t guid, boolean_t bookmark_ok, uint64_t *redact_snap_guids,
uint64_t num_redact_snaps, char *name)
{
char pname[ZFS_MAX_DATASET_NAME_LEN];
guid_to_name_data_t gtnd;
gtnd.guid = guid;
gtnd.bookmark_ok = bookmark_ok;
gtnd.name = name;
gtnd.skip = NULL;
gtnd.redact_snap_guids = redact_snap_guids;
gtnd.num_redact_snaps = num_redact_snaps;
/*
* Search progressively larger portions of the hierarchy, starting
* with the filesystem specified by 'parent'. This will
* select the "most local" version of the origin snapshot in the case
* that there are multiple matching snapshots in the system.
*/
(void) strlcpy(pname, parent, sizeof (pname));
char *cp = strrchr(pname, '@');
if (cp == NULL)
cp = strchr(pname, '\0');
for (; cp != NULL; cp = strrchr(pname, '/')) {
/* Chop off the last component and open the parent */
*cp = '\0';
zfs_handle_t *zhp = make_dataset_handle(hdl, pname);
if (zhp == NULL)
continue;
int err = guid_to_name_cb(zfs_handle_dup(zhp), &gtnd);
if (err != EEXIST)
err = zfs_iter_children(zhp, guid_to_name_cb, &gtnd);
if (err != EEXIST && bookmark_ok)
err = zfs_iter_bookmarks(zhp, guid_to_name_cb, &gtnd);
zfs_close(zhp);
if (err == EEXIST)
return (0);
/*
* Remember the last portion of the dataset so we skip it next
* time through (as we've already searched that portion of the
* hierarchy).
*/
gtnd.skip = strrchr(pname, '/') + 1;
}
return (ENOENT);
}
static int
guid_to_name(libzfs_handle_t *hdl, const char *parent, uint64_t guid,
boolean_t bookmark_ok, char *name)
{
return (guid_to_name_redact_snaps(hdl, parent, guid, bookmark_ok, NULL,
-1, name));
}
/*
* Return +1 if guid1 is before guid2, 0 if they are the same, and -1 if
* guid1 is after guid2.
*/
static int
created_before(libzfs_handle_t *hdl, avl_tree_t *avl,
uint64_t guid1, uint64_t guid2)
{
nvlist_t *nvfs;
char *fsname = NULL, *snapname = NULL;
char buf[ZFS_MAX_DATASET_NAME_LEN];
int rv;
zfs_handle_t *guid1hdl, *guid2hdl;
uint64_t create1, create2;
if (guid2 == 0)
return (0);
if (guid1 == 0)
return (1);
nvfs = fsavl_find(avl, guid1, &snapname);
VERIFY(0 == nvlist_lookup_string(nvfs, "name", &fsname));
(void) snprintf(buf, sizeof (buf), "%s@%s", fsname, snapname);
guid1hdl = zfs_open(hdl, buf, ZFS_TYPE_SNAPSHOT);
if (guid1hdl == NULL)
return (-1);
nvfs = fsavl_find(avl, guid2, &snapname);
VERIFY(0 == nvlist_lookup_string(nvfs, "name", &fsname));
(void) snprintf(buf, sizeof (buf), "%s@%s", fsname, snapname);
guid2hdl = zfs_open(hdl, buf, ZFS_TYPE_SNAPSHOT);
if (guid2hdl == NULL) {
zfs_close(guid1hdl);
return (-1);
}
create1 = zfs_prop_get_int(guid1hdl, ZFS_PROP_CREATETXG);
create2 = zfs_prop_get_int(guid2hdl, ZFS_PROP_CREATETXG);
if (create1 < create2)
rv = -1;
else if (create1 > create2)
rv = +1;
else
rv = 0;
zfs_close(guid1hdl);
zfs_close(guid2hdl);
return (rv);
}
/*
* This function reestablishes the hierarchy of encryption roots after a
* recursive incremental receive has completed. This must be done after the
* second call to recv_incremental_replication() has renamed and promoted all
* sent datasets to their final locations in the dataset hierarchy.
*/
static int
recv_fix_encryption_hierarchy(libzfs_handle_t *hdl, const char *top_zfs,
nvlist_t *stream_nv, avl_tree_t *stream_avl)
{
int err;
nvpair_t *fselem = NULL;
nvlist_t *stream_fss;
VERIFY(0 == nvlist_lookup_nvlist(stream_nv, "fss", &stream_fss));
while ((fselem = nvlist_next_nvpair(stream_fss, fselem)) != NULL) {
zfs_handle_t *zhp = NULL;
uint64_t crypt;
nvlist_t *snaps, *props, *stream_nvfs = NULL;
nvpair_t *snapel = NULL;
boolean_t is_encroot, is_clone, stream_encroot;
char *cp;
char *stream_keylocation = NULL;
char keylocation[MAXNAMELEN];
char fsname[ZFS_MAX_DATASET_NAME_LEN];
keylocation[0] = '\0';
VERIFY(0 == nvpair_value_nvlist(fselem, &stream_nvfs));
VERIFY(0 == nvlist_lookup_nvlist(stream_nvfs, "snaps", &snaps));
VERIFY(0 == nvlist_lookup_nvlist(stream_nvfs, "props", &props));
stream_encroot = nvlist_exists(stream_nvfs, "is_encroot");
/* find a snapshot from the stream that exists locally */
err = ENOENT;
while ((snapel = nvlist_next_nvpair(snaps, snapel)) != NULL) {
uint64_t guid;
VERIFY(0 == nvpair_value_uint64(snapel, &guid));
err = guid_to_name(hdl, top_zfs, guid, B_FALSE,
fsname);
if (err == 0)
break;
}
if (err != 0)
continue;
cp = strchr(fsname, '@');
if (cp != NULL)
*cp = '\0';
zhp = zfs_open(hdl, fsname, ZFS_TYPE_DATASET);
if (zhp == NULL) {
err = ENOENT;
goto error;
}
crypt = zfs_prop_get_int(zhp, ZFS_PROP_ENCRYPTION);
is_clone = zhp->zfs_dmustats.dds_origin[0] != '\0';
(void) zfs_crypto_get_encryption_root(zhp, &is_encroot, NULL);
/* we don't need to do anything for unencrypted datasets */
if (crypt == ZIO_CRYPT_OFF) {
zfs_close(zhp);
continue;
}
/*
* If the dataset is flagged as an encryption root, was not
* received as a clone and is not currently an encryption root,
* force it to become one. Fixup the keylocation if necessary.
*/
if (stream_encroot) {
if (!is_clone && !is_encroot) {
err = lzc_change_key(fsname,
DCP_CMD_FORCE_NEW_KEY, NULL, NULL, 0);
if (err != 0) {
zfs_close(zhp);
goto error;
}
}
VERIFY(0 == nvlist_lookup_string(props,
zfs_prop_to_name(ZFS_PROP_KEYLOCATION),
&stream_keylocation));
/*
* Refresh the properties in case the call to
* lzc_change_key() changed the value.
*/
zfs_refresh_properties(zhp);
err = zfs_prop_get(zhp, ZFS_PROP_KEYLOCATION,
keylocation, sizeof (keylocation), NULL, NULL,
0, B_TRUE);
if (err != 0) {
zfs_close(zhp);
goto error;
}
if (strcmp(keylocation, stream_keylocation) != 0) {
err = zfs_prop_set(zhp,
zfs_prop_to_name(ZFS_PROP_KEYLOCATION),
stream_keylocation);
if (err != 0) {
zfs_close(zhp);
goto error;
}
}
}
/*
* If the dataset is not flagged as an encryption root and is
* currently an encryption root, force it to inherit from its
* parent. The root of a raw send should never be
* force-inherited.
*/
if (!stream_encroot && is_encroot &&
strcmp(top_zfs, fsname) != 0) {
err = lzc_change_key(fsname, DCP_CMD_FORCE_INHERIT,
NULL, NULL, 0);
if (err != 0) {
zfs_close(zhp);
goto error;
}
}
zfs_close(zhp);
}
return (0);
error:
return (err);
}
static int
recv_incremental_replication(libzfs_handle_t *hdl, const char *tofs,
recvflags_t *flags, nvlist_t *stream_nv, avl_tree_t *stream_avl,
nvlist_t *renamed)
{
nvlist_t *local_nv, *deleted = NULL;
avl_tree_t *local_avl;
nvpair_t *fselem, *nextfselem;
char *fromsnap;
char newname[ZFS_MAX_DATASET_NAME_LEN];
char guidname[32];
int error;
boolean_t needagain, progress, recursive;
char *s1, *s2;
VERIFY(0 == nvlist_lookup_string(stream_nv, "fromsnap", &fromsnap));
recursive = (nvlist_lookup_boolean(stream_nv, "not_recursive") ==
ENOENT);
if (flags->dryrun)
return (0);
again:
needagain = progress = B_FALSE;
VERIFY(0 == nvlist_alloc(&deleted, NV_UNIQUE_NAME, 0));
if ((error = gather_nvlist(hdl, tofs, fromsnap, NULL,
recursive, B_TRUE, B_FALSE, recursive, B_FALSE, B_FALSE,
B_FALSE, B_TRUE, &local_nv, &local_avl)) != 0)
return (error);
/*
* Process deletes and renames
*/
for (fselem = nvlist_next_nvpair(local_nv, NULL);
fselem; fselem = nextfselem) {
nvlist_t *nvfs, *snaps;
nvlist_t *stream_nvfs = NULL;
nvpair_t *snapelem, *nextsnapelem;
uint64_t fromguid = 0;
uint64_t originguid = 0;
uint64_t stream_originguid = 0;
uint64_t parent_fromsnap_guid, stream_parent_fromsnap_guid;
char *fsname, *stream_fsname;
nextfselem = nvlist_next_nvpair(local_nv, fselem);
VERIFY(0 == nvpair_value_nvlist(fselem, &nvfs));
VERIFY(0 == nvlist_lookup_nvlist(nvfs, "snaps", &snaps));
VERIFY(0 == nvlist_lookup_string(nvfs, "name", &fsname));
VERIFY(0 == nvlist_lookup_uint64(nvfs, "parentfromsnap",
&parent_fromsnap_guid));
(void) nvlist_lookup_uint64(nvfs, "origin", &originguid);
/*
* First find the stream's fs, so we can check for
* a different origin (due to "zfs promote")
*/
for (snapelem = nvlist_next_nvpair(snaps, NULL);
snapelem; snapelem = nvlist_next_nvpair(snaps, snapelem)) {
uint64_t thisguid;
VERIFY(0 == nvpair_value_uint64(snapelem, &thisguid));
stream_nvfs = fsavl_find(stream_avl, thisguid, NULL);
if (stream_nvfs != NULL)
break;
}
/* check for promote */
(void) nvlist_lookup_uint64(stream_nvfs, "origin",
&stream_originguid);
if (stream_nvfs && originguid != stream_originguid) {
switch (created_before(hdl, local_avl,
stream_originguid, originguid)) {
case 1: {
/* promote it! */
nvlist_t *origin_nvfs;
char *origin_fsname;
origin_nvfs = fsavl_find(local_avl, originguid,
NULL);
VERIFY(0 == nvlist_lookup_string(origin_nvfs,
"name", &origin_fsname));
error = recv_promote(hdl, fsname, origin_fsname,
flags);
if (error == 0)
progress = B_TRUE;
break;
}
default:
break;
case -1:
fsavl_destroy(local_avl);
nvlist_free(local_nv);
return (-1);
}
/*
* We had/have the wrong origin, therefore our
* list of snapshots is wrong. Need to handle
* them on the next pass.
*/
needagain = B_TRUE;
continue;
}
for (snapelem = nvlist_next_nvpair(snaps, NULL);
snapelem; snapelem = nextsnapelem) {
uint64_t thisguid;
char *stream_snapname;
nvlist_t *found, *props;
nextsnapelem = nvlist_next_nvpair(snaps, snapelem);
VERIFY(0 == nvpair_value_uint64(snapelem, &thisguid));
found = fsavl_find(stream_avl, thisguid,
&stream_snapname);
/* check for delete */
if (found == NULL) {
char name[ZFS_MAX_DATASET_NAME_LEN];
if (!flags->force)
continue;
(void) snprintf(name, sizeof (name), "%s@%s",
fsname, nvpair_name(snapelem));
error = recv_destroy(hdl, name,
strlen(fsname)+1, newname, flags);
if (error)
needagain = B_TRUE;
else
progress = B_TRUE;
sprintf(guidname, "%llu",
(u_longlong_t)thisguid);
nvlist_add_boolean(deleted, guidname);
continue;
}
stream_nvfs = found;
if (0 == nvlist_lookup_nvlist(stream_nvfs, "snapprops",
&props) && 0 == nvlist_lookup_nvlist(props,
stream_snapname, &props)) {
zfs_cmd_t zc = {"\0"};
zc.zc_cookie = B_TRUE; /* received */
(void) snprintf(zc.zc_name, sizeof (zc.zc_name),
"%s@%s", fsname, nvpair_name(snapelem));
if (zcmd_write_src_nvlist(hdl, &zc,
props) == 0) {
(void) zfs_ioctl(hdl,
ZFS_IOC_SET_PROP, &zc);
zcmd_free_nvlists(&zc);
}
}
/* check for different snapname */
if (strcmp(nvpair_name(snapelem),
stream_snapname) != 0) {
char name[ZFS_MAX_DATASET_NAME_LEN];
char tryname[ZFS_MAX_DATASET_NAME_LEN];
(void) snprintf(name, sizeof (name), "%s@%s",
fsname, nvpair_name(snapelem));
(void) snprintf(tryname, sizeof (name), "%s@%s",
fsname, stream_snapname);
error = recv_rename(hdl, name, tryname,
strlen(fsname)+1, newname, flags);
if (error)
needagain = B_TRUE;
else
progress = B_TRUE;
}
if (strcmp(stream_snapname, fromsnap) == 0)
fromguid = thisguid;
}
/* check for delete */
if (stream_nvfs == NULL) {
if (!flags->force)
continue;
error = recv_destroy(hdl, fsname, strlen(tofs)+1,
newname, flags);
if (error)
needagain = B_TRUE;
else
progress = B_TRUE;
sprintf(guidname, "%llu",
(u_longlong_t)parent_fromsnap_guid);
nvlist_add_boolean(deleted, guidname);
continue;
}
if (fromguid == 0) {
if (flags->verbose) {
(void) printf("local fs %s does not have "
"fromsnap (%s in stream); must have "
"been deleted locally; ignoring\n",
fsname, fromsnap);
}
continue;
}
VERIFY(0 == nvlist_lookup_string(stream_nvfs,
"name", &stream_fsname));
VERIFY(0 == nvlist_lookup_uint64(stream_nvfs,
"parentfromsnap", &stream_parent_fromsnap_guid));
s1 = strrchr(fsname, '/');
s2 = strrchr(stream_fsname, '/');
/*
* Check if we're going to rename based on parent guid change
* and the current parent guid was also deleted. If it was then
* rename will fail and is likely unneeded, so avoid this and
* force an early retry to determine the new
* parent_fromsnap_guid.
*/
if (stream_parent_fromsnap_guid != 0 &&
parent_fromsnap_guid != 0 &&
stream_parent_fromsnap_guid != parent_fromsnap_guid) {
sprintf(guidname, "%llu",
(u_longlong_t)parent_fromsnap_guid);
if (nvlist_exists(deleted, guidname)) {
progress = B_TRUE;
needagain = B_TRUE;
goto doagain;
}
}
/*
* Check for rename. If the exact receive path is specified, it
* does not count as a rename, but we still need to check the
* datasets beneath it.
*/
if ((stream_parent_fromsnap_guid != 0 &&
parent_fromsnap_guid != 0 &&
stream_parent_fromsnap_guid != parent_fromsnap_guid) ||
((flags->isprefix || strcmp(tofs, fsname) != 0) &&
(s1 != NULL) && (s2 != NULL) && strcmp(s1, s2) != 0)) {
nvlist_t *parent;
char tryname[ZFS_MAX_DATASET_NAME_LEN];
parent = fsavl_find(local_avl,
stream_parent_fromsnap_guid, NULL);
/*
* NB: parent might not be found if we used the
* tosnap for stream_parent_fromsnap_guid,
* because the parent is a newly-created fs;
* we'll be able to rename it after we recv the
* new fs.
*/
if (parent != NULL) {
char *pname;
VERIFY(0 == nvlist_lookup_string(parent, "name",
&pname));
(void) snprintf(tryname, sizeof (tryname),
"%s%s", pname, strrchr(stream_fsname, '/'));
} else {
tryname[0] = '\0';
if (flags->verbose) {
(void) printf("local fs %s new parent "
"not found\n", fsname);
}
}
newname[0] = '\0';
error = recv_rename(hdl, fsname, tryname,
strlen(tofs)+1, newname, flags);
if (renamed != NULL && newname[0] != '\0') {
VERIFY(0 == nvlist_add_boolean(renamed,
newname));
}
if (error)
needagain = B_TRUE;
else
progress = B_TRUE;
}
}
doagain:
fsavl_destroy(local_avl);
nvlist_free(local_nv);
nvlist_free(deleted);
if (needagain && progress) {
/* do another pass to fix up temporary names */
if (flags->verbose)
(void) printf("another pass:\n");
goto again;
}
return (needagain || error != 0);
}
static int
zfs_receive_package(libzfs_handle_t *hdl, int fd, const char *destname,
recvflags_t *flags, dmu_replay_record_t *drr, zio_cksum_t *zc,
char **top_zfs, nvlist_t *cmdprops)
{
nvlist_t *stream_nv = NULL;
avl_tree_t *stream_avl = NULL;
char *fromsnap = NULL;
char *sendsnap = NULL;
char *cp;
char tofs[ZFS_MAX_DATASET_NAME_LEN];
char sendfs[ZFS_MAX_DATASET_NAME_LEN];
char errbuf[1024];
dmu_replay_record_t drre;
int error;
boolean_t anyerr = B_FALSE;
boolean_t softerr = B_FALSE;
boolean_t recursive, raw;
(void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
"cannot receive"));
assert(drr->drr_type == DRR_BEGIN);
assert(drr->drr_u.drr_begin.drr_magic == DMU_BACKUP_MAGIC);
assert(DMU_GET_STREAM_HDRTYPE(drr->drr_u.drr_begin.drr_versioninfo) ==
DMU_COMPOUNDSTREAM);
/*
* Read in the nvlist from the stream.
*/
if (drr->drr_payloadlen != 0) {
error = recv_read_nvlist(hdl, fd, drr->drr_payloadlen,
&stream_nv, flags->byteswap, zc);
if (error) {
error = zfs_error(hdl, EZFS_BADSTREAM, errbuf);
goto out;
}
}
recursive = (nvlist_lookup_boolean(stream_nv, "not_recursive") ==
ENOENT);
raw = (nvlist_lookup_boolean(stream_nv, "raw") == 0);
if (recursive && strchr(destname, '@')) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"cannot specify snapshot name for multi-snapshot stream"));
error = zfs_error(hdl, EZFS_BADSTREAM, errbuf);
goto out;
}
/*
* Read in the end record and verify checksum.
*/
if (0 != (error = recv_read(hdl, fd, &drre, sizeof (drre),
flags->byteswap, NULL)))
goto out;
if (flags->byteswap) {
drre.drr_type = BSWAP_32(drre.drr_type);
drre.drr_u.drr_end.drr_checksum.zc_word[0] =
BSWAP_64(drre.drr_u.drr_end.drr_checksum.zc_word[0]);
drre.drr_u.drr_end.drr_checksum.zc_word[1] =
BSWAP_64(drre.drr_u.drr_end.drr_checksum.zc_word[1]);
drre.drr_u.drr_end.drr_checksum.zc_word[2] =
BSWAP_64(drre.drr_u.drr_end.drr_checksum.zc_word[2]);
drre.drr_u.drr_end.drr_checksum.zc_word[3] =
BSWAP_64(drre.drr_u.drr_end.drr_checksum.zc_word[3]);
}
if (drre.drr_type != DRR_END) {
error = zfs_error(hdl, EZFS_BADSTREAM, errbuf);
goto out;
}
if (!ZIO_CHECKSUM_EQUAL(drre.drr_u.drr_end.drr_checksum, *zc)) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"incorrect header checksum"));
error = zfs_error(hdl, EZFS_BADSTREAM, errbuf);
goto out;
}
(void) nvlist_lookup_string(stream_nv, "fromsnap", &fromsnap);
if (drr->drr_payloadlen != 0) {
nvlist_t *stream_fss;
VERIFY(0 == nvlist_lookup_nvlist(stream_nv, "fss",
&stream_fss));
if ((stream_avl = fsavl_create(stream_fss)) == NULL) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"couldn't allocate avl tree"));
error = zfs_error(hdl, EZFS_NOMEM, errbuf);
goto out;
}
if (fromsnap != NULL && recursive) {
nvlist_t *renamed = NULL;
nvpair_t *pair = NULL;
(void) strlcpy(tofs, destname, sizeof (tofs));
if (flags->isprefix) {
struct drr_begin *drrb = &drr->drr_u.drr_begin;
int i;
if (flags->istail) {
cp = strrchr(drrb->drr_toname, '/');
if (cp == NULL) {
(void) strlcat(tofs, "/",
sizeof (tofs));
i = 0;
} else {
i = (cp - drrb->drr_toname);
}
} else {
i = strcspn(drrb->drr_toname, "/@");
}
/* zfs_receive_one() will create_parents() */
(void) strlcat(tofs, &drrb->drr_toname[i],
sizeof (tofs));
*strchr(tofs, '@') = '\0';
}
if (!flags->dryrun && !flags->nomount) {
VERIFY(0 == nvlist_alloc(&renamed,
NV_UNIQUE_NAME, 0));
}
softerr = recv_incremental_replication(hdl, tofs, flags,
stream_nv, stream_avl, renamed);
/* Unmount renamed filesystems before receiving. */
while ((pair = nvlist_next_nvpair(renamed,
pair)) != NULL) {
zfs_handle_t *zhp;
prop_changelist_t *clp = NULL;
zhp = zfs_open(hdl, nvpair_name(pair),
ZFS_TYPE_FILESYSTEM);
if (zhp != NULL) {
clp = changelist_gather(zhp,
ZFS_PROP_MOUNTPOINT, 0,
flags->forceunmount ? MS_FORCE : 0);
zfs_close(zhp);
if (clp != NULL) {
softerr |=
changelist_prefix(clp);
changelist_free(clp);
}
}
}
nvlist_free(renamed);
}
}
/*
* Get the fs specified by the first path in the stream (the top level
* specified by 'zfs send') and pass it to each invocation of
* zfs_receive_one().
*/
(void) strlcpy(sendfs, drr->drr_u.drr_begin.drr_toname,
sizeof (sendfs));
if ((cp = strchr(sendfs, '@')) != NULL) {
*cp = '\0';
/*
* Find the "sendsnap", the final snapshot in a replication
* stream. zfs_receive_one() handles certain errors
* differently, depending on if the contained stream is the
* last one or not.
*/
sendsnap = (cp + 1);
}
/* Finally, receive each contained stream */
do {
/*
* we should figure out if it has a recoverable
* error, in which case do a recv_skip() and drive on.
* Note, if we fail due to already having this guid,
* zfs_receive_one() will take care of it (ie,
* recv_skip() and return 0).
*/
error = zfs_receive_impl(hdl, destname, NULL, flags, fd,
sendfs, stream_nv, stream_avl, top_zfs, sendsnap, cmdprops);
if (error == ENODATA) {
error = 0;
break;
}
anyerr |= error;
} while (error == 0);
if (drr->drr_payloadlen != 0 && recursive && fromsnap != NULL) {
/*
* Now that we have the fs's they sent us, try the
* renames again.
*/
softerr = recv_incremental_replication(hdl, tofs, flags,
stream_nv, stream_avl, NULL);
}
if (raw && softerr == 0 && *top_zfs != NULL) {
softerr = recv_fix_encryption_hierarchy(hdl, *top_zfs,
stream_nv, stream_avl);
}
out:
fsavl_destroy(stream_avl);
nvlist_free(stream_nv);
if (softerr)
error = -2;
if (anyerr)
error = -1;
return (error);
}
static void
trunc_prop_errs(int truncated)
{
ASSERT(truncated != 0);
if (truncated == 1)
(void) fprintf(stderr, dgettext(TEXT_DOMAIN,
"1 more property could not be set\n"));
else
(void) fprintf(stderr, dgettext(TEXT_DOMAIN,
"%d more properties could not be set\n"), truncated);
}
static int
recv_skip(libzfs_handle_t *hdl, int fd, boolean_t byteswap)
{
dmu_replay_record_t *drr;
void *buf = zfs_alloc(hdl, SPA_MAXBLOCKSIZE);
uint64_t payload_size;
char errbuf[1024];
(void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
"cannot receive"));
/* XXX would be great to use lseek if possible... */
drr = buf;
while (recv_read(hdl, fd, drr, sizeof (dmu_replay_record_t),
byteswap, NULL) == 0) {
if (byteswap)
drr->drr_type = BSWAP_32(drr->drr_type);
switch (drr->drr_type) {
case DRR_BEGIN:
if (drr->drr_payloadlen != 0) {
(void) recv_read(hdl, fd, buf,
drr->drr_payloadlen, B_FALSE, NULL);
}
break;
case DRR_END:
free(buf);
return (0);
case DRR_OBJECT:
if (byteswap) {
drr->drr_u.drr_object.drr_bonuslen =
BSWAP_32(drr->drr_u.drr_object.
drr_bonuslen);
drr->drr_u.drr_object.drr_raw_bonuslen =
BSWAP_32(drr->drr_u.drr_object.
drr_raw_bonuslen);
}
payload_size =
DRR_OBJECT_PAYLOAD_SIZE(&drr->drr_u.drr_object);
(void) recv_read(hdl, fd, buf, payload_size,
B_FALSE, NULL);
break;
case DRR_WRITE:
if (byteswap) {
drr->drr_u.drr_write.drr_logical_size =
BSWAP_64(
drr->drr_u.drr_write.drr_logical_size);
drr->drr_u.drr_write.drr_compressed_size =
BSWAP_64(
drr->drr_u.drr_write.drr_compressed_size);
}
payload_size =
DRR_WRITE_PAYLOAD_SIZE(&drr->drr_u.drr_write);
assert(payload_size <= SPA_MAXBLOCKSIZE);
(void) recv_read(hdl, fd, buf,
payload_size, B_FALSE, NULL);
break;
case DRR_SPILL:
if (byteswap) {
drr->drr_u.drr_spill.drr_length =
BSWAP_64(drr->drr_u.drr_spill.drr_length);
drr->drr_u.drr_spill.drr_compressed_size =
BSWAP_64(drr->drr_u.drr_spill.
drr_compressed_size);
}
payload_size =
DRR_SPILL_PAYLOAD_SIZE(&drr->drr_u.drr_spill);
(void) recv_read(hdl, fd, buf, payload_size,
B_FALSE, NULL);
break;
case DRR_WRITE_EMBEDDED:
if (byteswap) {
drr->drr_u.drr_write_embedded.drr_psize =
BSWAP_32(drr->drr_u.drr_write_embedded.
drr_psize);
}
(void) recv_read(hdl, fd, buf,
P2ROUNDUP(drr->drr_u.drr_write_embedded.drr_psize,
8), B_FALSE, NULL);
break;
case DRR_OBJECT_RANGE:
case DRR_WRITE_BYREF:
case DRR_FREEOBJECTS:
case DRR_FREE:
break;
default:
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"invalid record type"));
free(buf);
return (zfs_error(hdl, EZFS_BADSTREAM, errbuf));
}
}
free(buf);
return (-1);
}
static void
recv_ecksum_set_aux(libzfs_handle_t *hdl, const char *target_snap,
boolean_t resumable, boolean_t checksum)
{
char target_fs[ZFS_MAX_DATASET_NAME_LEN];
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, (checksum ?
"checksum mismatch" : "incomplete stream")));
if (!resumable)
return;
(void) strlcpy(target_fs, target_snap, sizeof (target_fs));
*strchr(target_fs, '@') = '\0';
zfs_handle_t *zhp = zfs_open(hdl, target_fs,
ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME);
if (zhp == NULL)
return;
char token_buf[ZFS_MAXPROPLEN];
int error = zfs_prop_get(zhp, ZFS_PROP_RECEIVE_RESUME_TOKEN,
token_buf, sizeof (token_buf),
NULL, NULL, 0, B_TRUE);
if (error == 0) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"checksum mismatch or incomplete stream.\n"
"Partially received snapshot is saved.\n"
"A resuming stream can be generated on the sending "
"system by running:\n"
" zfs send -t %s"),
token_buf);
}
zfs_close(zhp);
}
/*
* Prepare a new nvlist of properties that are to override (-o) or be excluded
* (-x) from the received dataset
* recvprops: received properties from the send stream
* cmdprops: raw input properties from command line
* origprops: properties, both locally-set and received, currently set on the
* target dataset if it exists, NULL otherwise.
* oxprops: valid output override (-o) and excluded (-x) properties
*/
static int
zfs_setup_cmdline_props(libzfs_handle_t *hdl, zfs_type_t type,
char *fsname, boolean_t zoned, boolean_t recursive, boolean_t newfs,
boolean_t raw, boolean_t toplevel, nvlist_t *recvprops, nvlist_t *cmdprops,
nvlist_t *origprops, nvlist_t **oxprops, uint8_t **wkeydata_out,
uint_t *wkeylen_out, const char *errbuf)
{
nvpair_t *nvp;
nvlist_t *oprops, *voprops;
zfs_handle_t *zhp = NULL;
zpool_handle_t *zpool_hdl = NULL;
char *cp;
int ret = 0;
char namebuf[ZFS_MAX_DATASET_NAME_LEN];
if (nvlist_empty(cmdprops))
return (0); /* No properties to override or exclude */
*oxprops = fnvlist_alloc();
oprops = fnvlist_alloc();
strlcpy(namebuf, fsname, ZFS_MAX_DATASET_NAME_LEN);
/*
* Get our dataset handle. The target dataset may not exist yet.
*/
if (zfs_dataset_exists(hdl, namebuf, ZFS_TYPE_DATASET)) {
zhp = zfs_open(hdl, namebuf, ZFS_TYPE_DATASET);
if (zhp == NULL) {
ret = -1;
goto error;
}
}
/* open the zpool handle */
cp = strchr(namebuf, '/');
if (cp != NULL)
*cp = '\0';
zpool_hdl = zpool_open(hdl, namebuf);
if (zpool_hdl == NULL) {
ret = -1;
goto error;
}
/* restore namebuf to match fsname for later use */
if (cp != NULL)
*cp = '/';
/*
* first iteration: process excluded (-x) properties now and gather
* added (-o) properties to be later processed by zfs_valid_proplist()
*/
nvp = NULL;
while ((nvp = nvlist_next_nvpair(cmdprops, nvp)) != NULL) {
const char *name = nvpair_name(nvp);
zfs_prop_t prop = zfs_name_to_prop(name);
/* "origin" is processed separately, don't handle it here */
if (prop == ZFS_PROP_ORIGIN)
continue;
/*
* we're trying to override or exclude a property that does not
* make sense for this type of dataset, but we don't want to
* fail if the receive is recursive: this comes in handy when
* the send stream contains, for instance, a child ZVOL and
* we're trying to receive it with "-o atime=on"
*/
if (!zfs_prop_valid_for_type(prop, type, B_FALSE) &&
!zfs_prop_user(name)) {
if (recursive)
continue;
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"property '%s' does not apply to datasets of this "
"type"), name);
ret = zfs_error(hdl, EZFS_BADPROP, errbuf);
goto error;
}
/* raw streams can't override encryption properties */
if ((zfs_prop_encryption_key_param(prop) ||
prop == ZFS_PROP_ENCRYPTION) && raw) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"encryption property '%s' cannot "
"be set or excluded for raw streams."), name);
ret = zfs_error(hdl, EZFS_BADPROP, errbuf);
goto error;
}
/* incremental streams can only exclude encryption properties */
if ((zfs_prop_encryption_key_param(prop) ||
prop == ZFS_PROP_ENCRYPTION) && !newfs &&
nvpair_type(nvp) != DATA_TYPE_BOOLEAN) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"encryption property '%s' cannot "
"be set for incremental streams."), name);
ret = zfs_error(hdl, EZFS_BADPROP, errbuf);
goto error;
}
switch (nvpair_type(nvp)) {
case DATA_TYPE_BOOLEAN: /* -x property */
/*
* DATA_TYPE_BOOLEAN is the way we're asked to "exclude"
* a property: this is done by forcing an explicit
* inherit on the destination so the effective value is
* not the one we received from the send stream.
* We do this only if the property is not already
* locally-set, in which case its value will take
* priority over the received anyway.
*/
if (nvlist_exists(origprops, name)) {
nvlist_t *attrs;
char *source = NULL;
attrs = fnvlist_lookup_nvlist(origprops, name);
if (nvlist_lookup_string(attrs,
ZPROP_SOURCE, &source) == 0 &&
strcmp(source, ZPROP_SOURCE_VAL_RECVD) != 0)
continue;
}
/*
* We can't force an explicit inherit on non-inheritable
* properties: if we're asked to exclude this kind of
* values we remove them from "recvprops" input nvlist.
*/
if (!zfs_prop_inheritable(prop) &&
!zfs_prop_user(name) && /* can be inherited too */
nvlist_exists(recvprops, name))
fnvlist_remove(recvprops, name);
else
fnvlist_add_nvpair(*oxprops, nvp);
break;
case DATA_TYPE_STRING: /* -o property=value */
fnvlist_add_nvpair(oprops, nvp);
break;
default:
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"property '%s' must be a string or boolean"), name);
ret = zfs_error(hdl, EZFS_BADPROP, errbuf);
goto error;
}
}
if (toplevel) {
/* convert override strings properties to native */
if ((voprops = zfs_valid_proplist(hdl, ZFS_TYPE_DATASET,
oprops, zoned, zhp, zpool_hdl, B_FALSE, errbuf)) == NULL) {
ret = zfs_error(hdl, EZFS_BADPROP, errbuf);
goto error;
}
/*
* zfs_crypto_create() requires the parent name. Get it
* by truncating the fsname copy stored in namebuf.
*/
cp = strrchr(namebuf, '/');
if (cp != NULL)
*cp = '\0';
if (!raw && zfs_crypto_create(hdl, namebuf, voprops, NULL,
B_FALSE, wkeydata_out, wkeylen_out) != 0) {
fnvlist_free(voprops);
ret = zfs_error(hdl, EZFS_CRYPTOFAILED, errbuf);
goto error;
}
/* second pass: process "-o" properties */
fnvlist_merge(*oxprops, voprops);
fnvlist_free(voprops);
} else {
/* override props on child dataset are inherited */
nvp = NULL;
while ((nvp = nvlist_next_nvpair(oprops, nvp)) != NULL) {
const char *name = nvpair_name(nvp);
fnvlist_add_boolean(*oxprops, name);
}
}
error:
if (zhp != NULL)
zfs_close(zhp);
if (zpool_hdl != NULL)
zpool_close(zpool_hdl);
fnvlist_free(oprops);
return (ret);
}
/*
* Restores a backup of tosnap from the file descriptor specified by infd.
*/
static int
zfs_receive_one(libzfs_handle_t *hdl, int infd, const char *tosnap,
const char *originsnap, recvflags_t *flags, dmu_replay_record_t *drr,
dmu_replay_record_t *drr_noswap, const char *sendfs, nvlist_t *stream_nv,
avl_tree_t *stream_avl, char **top_zfs,
const char *finalsnap, nvlist_t *cmdprops)
{
time_t begin_time;
int ioctl_err, ioctl_errno, err;
char *cp;
struct drr_begin *drrb = &drr->drr_u.drr_begin;
char errbuf[1024];
const char *chopprefix;
boolean_t newfs = B_FALSE;
boolean_t stream_wantsnewfs, stream_resumingnewfs;
boolean_t newprops = B_FALSE;
uint64_t read_bytes = 0;
uint64_t errflags = 0;
uint64_t parent_snapguid = 0;
prop_changelist_t *clp = NULL;
nvlist_t *snapprops_nvlist = NULL;
nvlist_t *snapholds_nvlist = NULL;
zprop_errflags_t prop_errflags;
nvlist_t *prop_errors = NULL;
boolean_t recursive;
char *snapname = NULL;
char destsnap[MAXPATHLEN * 2];
char origin[MAXNAMELEN];
char name[MAXPATHLEN];
char tmp_keylocation[MAXNAMELEN];
nvlist_t *rcvprops = NULL; /* props received from the send stream */
nvlist_t *oxprops = NULL; /* override (-o) and exclude (-x) props */
nvlist_t *origprops = NULL; /* original props (if destination exists) */
zfs_type_t type;
boolean_t toplevel = B_FALSE;
boolean_t zoned = B_FALSE;
boolean_t hastoken = B_FALSE;
boolean_t redacted;
uint8_t *wkeydata = NULL;
uint_t wkeylen = 0;
begin_time = time(NULL);
bzero(origin, MAXNAMELEN);
bzero(tmp_keylocation, MAXNAMELEN);
(void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
"cannot receive"));
recursive = (nvlist_lookup_boolean(stream_nv, "not_recursive") ==
ENOENT);
/* Did the user request holds be skipped via zfs recv -k? */
boolean_t holds = flags->holds && !flags->skipholds;
if (stream_avl != NULL) {
char *keylocation = NULL;
nvlist_t *lookup = NULL;
nvlist_t *fs = fsavl_find(stream_avl, drrb->drr_toguid,
&snapname);
(void) nvlist_lookup_uint64(fs, "parentfromsnap",
&parent_snapguid);
err = nvlist_lookup_nvlist(fs, "props", &rcvprops);
if (err) {
VERIFY(0 == nvlist_alloc(&rcvprops, NV_UNIQUE_NAME, 0));
newprops = B_TRUE;
}
/*
* The keylocation property may only be set on encryption roots,
* but this dataset might not become an encryption root until
* recv_fix_encryption_hierarchy() is called. That function
* will fixup the keylocation anyway, so we temporarily unset
* the keylocation for now to avoid any errors from the receive
* ioctl.
*/
err = nvlist_lookup_string(rcvprops,
zfs_prop_to_name(ZFS_PROP_KEYLOCATION), &keylocation);
if (err == 0) {
strcpy(tmp_keylocation, keylocation);
(void) nvlist_remove_all(rcvprops,
zfs_prop_to_name(ZFS_PROP_KEYLOCATION));
}
if (flags->canmountoff) {
VERIFY(0 == nvlist_add_uint64(rcvprops,
zfs_prop_to_name(ZFS_PROP_CANMOUNT), 0));
} else if (newprops) { /* nothing in rcvprops, eliminate it */
nvlist_free(rcvprops);
rcvprops = NULL;
newprops = B_FALSE;
}
if (0 == nvlist_lookup_nvlist(fs, "snapprops", &lookup)) {
VERIFY(0 == nvlist_lookup_nvlist(lookup,
snapname, &snapprops_nvlist));
}
if (holds) {
if (0 == nvlist_lookup_nvlist(fs, "snapholds",
&lookup)) {
VERIFY(0 == nvlist_lookup_nvlist(lookup,
snapname, &snapholds_nvlist));
}
}
}
cp = NULL;
/*
* Determine how much of the snapshot name stored in the stream
* we are going to tack on to the name they specified on the
* command line, and how much we are going to chop off.
*
* If they specified a snapshot, chop the entire name stored in
* the stream.
*/
if (flags->istail) {
/*
* A filesystem was specified with -e. We want to tack on only
* the tail of the sent snapshot path.
*/
if (strchr(tosnap, '@')) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "invalid "
"argument - snapshot not allowed with -e"));
err = zfs_error(hdl, EZFS_INVALIDNAME, errbuf);
goto out;
}
chopprefix = strrchr(sendfs, '/');
if (chopprefix == NULL) {
/*
* The tail is the poolname, so we need to
* prepend a path separator.
*/
int len = strlen(drrb->drr_toname);
cp = malloc(len + 2);
cp[0] = '/';
(void) strcpy(&cp[1], drrb->drr_toname);
chopprefix = cp;
} else {
chopprefix = drrb->drr_toname + (chopprefix - sendfs);
}
} else if (flags->isprefix) {
/*
* A filesystem was specified with -d. We want to tack on
* everything but the first element of the sent snapshot path
* (all but the pool name).
*/
if (strchr(tosnap, '@')) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "invalid "
"argument - snapshot not allowed with -d"));
err = zfs_error(hdl, EZFS_INVALIDNAME, errbuf);
goto out;
}
chopprefix = strchr(drrb->drr_toname, '/');
if (chopprefix == NULL)
chopprefix = strchr(drrb->drr_toname, '@');
} else if (strchr(tosnap, '@') == NULL) {
/*
* If a filesystem was specified without -d or -e, we want to
* tack on everything after the fs specified by 'zfs send'.
*/
chopprefix = drrb->drr_toname + strlen(sendfs);
} else {
/* A snapshot was specified as an exact path (no -d or -e). */
if (recursive) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"cannot specify snapshot name for multi-snapshot "
"stream"));
err = zfs_error(hdl, EZFS_BADSTREAM, errbuf);
goto out;
}
chopprefix = drrb->drr_toname + strlen(drrb->drr_toname);
}
ASSERT(strstr(drrb->drr_toname, sendfs) == drrb->drr_toname);
ASSERT(chopprefix > drrb->drr_toname || strchr(sendfs, '/') == NULL);
ASSERT(chopprefix <= drrb->drr_toname + strlen(drrb->drr_toname) ||
strchr(sendfs, '/') == NULL);
ASSERT(chopprefix[0] == '/' || chopprefix[0] == '@' ||
chopprefix[0] == '\0');
/*
* Determine name of destination snapshot.
*/
(void) strlcpy(destsnap, tosnap, sizeof (destsnap));
(void) strlcat(destsnap, chopprefix, sizeof (destsnap));
free(cp);
if (!zfs_name_valid(destsnap, ZFS_TYPE_SNAPSHOT)) {
err = zfs_error(hdl, EZFS_INVALIDNAME, errbuf);
goto out;
}
/*
* Determine the name of the origin snapshot.
*/
if (originsnap) {
(void) strlcpy(origin, originsnap, sizeof (origin));
if (flags->verbose)
(void) printf("using provided clone origin %s\n",
origin);
} else if (drrb->drr_flags & DRR_FLAG_CLONE) {
if (guid_to_name(hdl, destsnap,
drrb->drr_fromguid, B_FALSE, origin) != 0) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"local origin for clone %s does not exist"),
destsnap);
err = zfs_error(hdl, EZFS_NOENT, errbuf);
goto out;
}
if (flags->verbose)
(void) printf("found clone origin %s\n", origin);
}
if ((DMU_GET_FEATUREFLAGS(drrb->drr_versioninfo) &
DMU_BACKUP_FEATURE_DEDUP)) {
(void) fprintf(stderr,
gettext("ERROR: \"zfs receive\" no longer supports "
"deduplicated send streams. Use\n"
"the \"zstream redup\" command to convert this stream "
"to a regular,\n"
"non-deduplicated stream.\n"));
err = zfs_error(hdl, EZFS_NOTSUP, errbuf);
goto out;
}
boolean_t resuming = DMU_GET_FEATUREFLAGS(drrb->drr_versioninfo) &
DMU_BACKUP_FEATURE_RESUMING;
boolean_t raw = DMU_GET_FEATUREFLAGS(drrb->drr_versioninfo) &
DMU_BACKUP_FEATURE_RAW;
boolean_t embedded = DMU_GET_FEATUREFLAGS(drrb->drr_versioninfo) &
DMU_BACKUP_FEATURE_EMBED_DATA;
stream_wantsnewfs = (drrb->drr_fromguid == 0 ||
(drrb->drr_flags & DRR_FLAG_CLONE) || originsnap) && !resuming;
stream_resumingnewfs = (drrb->drr_fromguid == 0 ||
(drrb->drr_flags & DRR_FLAG_CLONE) || originsnap) && resuming;
if (stream_wantsnewfs) {
/*
* if the parent fs does not exist, look for it based on
* the parent snap GUID
*/
(void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
"cannot receive new filesystem stream"));
(void) strcpy(name, destsnap);
cp = strrchr(name, '/');
if (cp)
*cp = '\0';
if (cp &&
!zfs_dataset_exists(hdl, name, ZFS_TYPE_DATASET)) {
char suffix[ZFS_MAX_DATASET_NAME_LEN];
(void) strcpy(suffix, strrchr(destsnap, '/'));
if (guid_to_name(hdl, name, parent_snapguid,
B_FALSE, destsnap) == 0) {
*strchr(destsnap, '@') = '\0';
(void) strcat(destsnap, suffix);
}
}
} else {
/*
* If the fs does not exist, look for it based on the
* fromsnap GUID.
*/
if (resuming) {
(void) snprintf(errbuf, sizeof (errbuf),
dgettext(TEXT_DOMAIN,
"cannot receive resume stream"));
} else {
(void) snprintf(errbuf, sizeof (errbuf),
dgettext(TEXT_DOMAIN,
"cannot receive incremental stream"));
}
(void) strcpy(name, destsnap);
*strchr(name, '@') = '\0';
/*
* If the exact receive path was specified and this is the
* topmost path in the stream, then if the fs does not exist we
* should look no further.
*/
if ((flags->isprefix || (*(chopprefix = drrb->drr_toname +
strlen(sendfs)) != '\0' && *chopprefix != '@')) &&
!zfs_dataset_exists(hdl, name, ZFS_TYPE_DATASET)) {
char snap[ZFS_MAX_DATASET_NAME_LEN];
(void) strcpy(snap, strchr(destsnap, '@'));
if (guid_to_name(hdl, name, drrb->drr_fromguid,
B_FALSE, destsnap) == 0) {
*strchr(destsnap, '@') = '\0';
(void) strcat(destsnap, snap);
}
}
}
(void) strcpy(name, destsnap);
*strchr(name, '@') = '\0';
redacted = DMU_GET_FEATUREFLAGS(drrb->drr_versioninfo) &
DMU_BACKUP_FEATURE_REDACTED;
if (zfs_dataset_exists(hdl, name, ZFS_TYPE_DATASET)) {
zfs_cmd_t zc = {"\0"};
zfs_handle_t *zhp;
boolean_t encrypted;
(void) strcpy(zc.zc_name, name);
/*
* Destination fs exists. It must be one of these cases:
* - an incremental send stream
* - the stream specifies a new fs (full stream or clone)
* and they want us to blow away the existing fs (and
* have therefore specified -F and removed any snapshots)
* - we are resuming a failed receive.
*/
if (stream_wantsnewfs) {
boolean_t is_volume = drrb->drr_type == DMU_OST_ZVOL;
if (!flags->force) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"destination '%s' exists\n"
"must specify -F to overwrite it"), name);
err = zfs_error(hdl, EZFS_EXISTS, errbuf);
goto out;
}
if (zfs_ioctl(hdl, ZFS_IOC_SNAPSHOT_LIST_NEXT,
&zc) == 0) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"destination has snapshots (eg. %s)\n"
"must destroy them to overwrite it"),
zc.zc_name);
err = zfs_error(hdl, EZFS_EXISTS, errbuf);
goto out;
}
if (is_volume && strrchr(name, '/') == NULL) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"destination %s is the root dataset\n"
"cannot overwrite with a ZVOL"),
name);
err = zfs_error(hdl, EZFS_EXISTS, errbuf);
goto out;
}
if (is_volume &&
zfs_ioctl(hdl, ZFS_IOC_DATASET_LIST_NEXT,
&zc) == 0) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"destination has children (eg. %s)\n"
"cannot overwrite with a ZVOL"),
zc.zc_name);
err = zfs_error(hdl, EZFS_WRONG_PARENT, errbuf);
goto out;
}
}
if ((zhp = zfs_open(hdl, name,
ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME)) == NULL) {
err = -1;
goto out;
}
if (stream_wantsnewfs &&
zhp->zfs_dmustats.dds_origin[0]) {
zfs_close(zhp);
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"destination '%s' is a clone\n"
"must destroy it to overwrite it"), name);
err = zfs_error(hdl, EZFS_EXISTS, errbuf);
goto out;
}
/*
* Raw sends can not be performed as an incremental on top
* of existing unencrypted datasets. zfs recv -F can't be
* used to blow away an existing encrypted filesystem. This
* is because it would require the dsl dir to point to the
* new key (or lack of a key) and the old key at the same
* time. The -F flag may still be used for deleting
* intermediate snapshots that would otherwise prevent the
* receive from working.
*/
encrypted = zfs_prop_get_int(zhp, ZFS_PROP_ENCRYPTION) !=
ZIO_CRYPT_OFF;
if (!stream_wantsnewfs && !encrypted && raw) {
zfs_close(zhp);
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"cannot perform raw receive on top of "
"existing unencrypted dataset"));
err = zfs_error(hdl, EZFS_BADRESTORE, errbuf);
goto out;
}
if (stream_wantsnewfs && flags->force &&
((raw && !encrypted) || encrypted)) {
zfs_close(zhp);
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"zfs receive -F cannot be used to destroy an "
"encrypted filesystem or overwrite an "
"unencrypted one with an encrypted one"));
err = zfs_error(hdl, EZFS_BADRESTORE, errbuf);
goto out;
}
if (!flags->dryrun && zhp->zfs_type == ZFS_TYPE_FILESYSTEM &&
(stream_wantsnewfs || stream_resumingnewfs)) {
/* We can't do online recv in this case */
clp = changelist_gather(zhp, ZFS_PROP_NAME, 0,
flags->forceunmount ? MS_FORCE : 0);
if (clp == NULL) {
zfs_close(zhp);
err = -1;
goto out;
}
if (changelist_prefix(clp) != 0) {
changelist_free(clp);
zfs_close(zhp);
err = -1;
goto out;
}
}
/*
* If we are resuming a newfs, set newfs here so that we will
* mount it if the recv succeeds this time. We can tell
* that it was a newfs on the first recv because the fs
* itself will be inconsistent (if the fs existed when we
* did the first recv, we would have received it into
* .../%recv).
*/
if (resuming && zfs_prop_get_int(zhp, ZFS_PROP_INCONSISTENT))
newfs = B_TRUE;
/* we want to know if we're zoned when validating -o|-x props */
zoned = zfs_prop_get_int(zhp, ZFS_PROP_ZONED);
/* may need this info later, get it now we have zhp around */
if (zfs_prop_get(zhp, ZFS_PROP_RECEIVE_RESUME_TOKEN, NULL, 0,
NULL, NULL, 0, B_TRUE) == 0)
hastoken = B_TRUE;
/* gather existing properties on destination */
origprops = fnvlist_alloc();
fnvlist_merge(origprops, zhp->zfs_props);
fnvlist_merge(origprops, zhp->zfs_user_props);
zfs_close(zhp);
} else {
zfs_handle_t *zhp;
/*
* Destination filesystem does not exist. Therefore we better
* be creating a new filesystem (either from a full backup, or
* a clone). It would therefore be invalid if the user
* specified only the pool name (i.e. if the destination name
* contained no slash character).
*/
cp = strrchr(name, '/');
if (!stream_wantsnewfs || cp == NULL) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"destination '%s' does not exist"), name);
err = zfs_error(hdl, EZFS_NOENT, errbuf);
goto out;
}
/*
* Trim off the final dataset component so we perform the
* recvbackup ioctl to the filesystems's parent.
*/
*cp = '\0';
if (flags->isprefix && !flags->istail && !flags->dryrun &&
create_parents(hdl, destsnap, strlen(tosnap)) != 0) {
err = zfs_error(hdl, EZFS_BADRESTORE, errbuf);
goto out;
}
/* validate parent */
zhp = zfs_open(hdl, name, ZFS_TYPE_DATASET);
if (zhp == NULL) {
err = zfs_error(hdl, EZFS_BADRESTORE, errbuf);
goto out;
}
if (zfs_get_type(zhp) != ZFS_TYPE_FILESYSTEM) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"parent '%s' is not a filesystem"), name);
err = zfs_error(hdl, EZFS_WRONG_PARENT, errbuf);
zfs_close(zhp);
goto out;
}
zfs_close(zhp);
newfs = B_TRUE;
*cp = '/';
}
if (flags->verbose) {
(void) printf("%s %s stream of %s into %s\n",
flags->dryrun ? "would receive" : "receiving",
drrb->drr_fromguid ? "incremental" : "full",
drrb->drr_toname, destsnap);
(void) fflush(stdout);
}
if (flags->dryrun) {
void *buf = zfs_alloc(hdl, SPA_MAXBLOCKSIZE);
/*
* We have read the DRR_BEGIN record, but we have
* not yet read the payload. For non-dryrun sends
* this will be done by the kernel, so we must
* emulate that here, before attempting to read
* more records.
*/
err = recv_read(hdl, infd, buf, drr->drr_payloadlen,
flags->byteswap, NULL);
free(buf);
if (err != 0)
goto out;
err = recv_skip(hdl, infd, flags->byteswap);
goto out;
}
/*
* If this is the top-level dataset, record it so we can use it
* for recursive operations later.
*/
if (top_zfs != NULL &&
(*top_zfs == NULL || strcmp(*top_zfs, name) == 0)) {
toplevel = B_TRUE;
if (*top_zfs == NULL)
*top_zfs = zfs_strdup(hdl, name);
}
if (drrb->drr_type == DMU_OST_ZVOL) {
type = ZFS_TYPE_VOLUME;
} else if (drrb->drr_type == DMU_OST_ZFS) {
type = ZFS_TYPE_FILESYSTEM;
} else {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"invalid record type: 0x%d"), drrb->drr_type);
err = zfs_error(hdl, EZFS_BADSTREAM, errbuf);
goto out;
}
if ((err = zfs_setup_cmdline_props(hdl, type, name, zoned, recursive,
stream_wantsnewfs, raw, toplevel, rcvprops, cmdprops, origprops,
&oxprops, &wkeydata, &wkeylen, errbuf)) != 0)
goto out;
/*
* When sending with properties (zfs send -p), the encryption property
* is not included because it is a SETONCE property and therefore
* treated as read only. However, we are always able to determine its
* value because raw sends will include it in the DRR_BDEGIN payload
* and non-raw sends with properties are not allowed for encrypted
* datasets. Therefore, if this is a non-raw properties stream, we can
* infer that the value should be ZIO_CRYPT_OFF and manually add that
* to the received properties.
*/
if (stream_wantsnewfs && !raw && rcvprops != NULL &&
!nvlist_exists(cmdprops, zfs_prop_to_name(ZFS_PROP_ENCRYPTION))) {
if (oxprops == NULL)
oxprops = fnvlist_alloc();
fnvlist_add_uint64(oxprops,
zfs_prop_to_name(ZFS_PROP_ENCRYPTION), ZIO_CRYPT_OFF);
}
err = ioctl_err = lzc_receive_with_cmdprops(destsnap, rcvprops,
oxprops, wkeydata, wkeylen, origin, flags->force, flags->resumable,
raw, infd, drr_noswap, -1, &read_bytes, &errflags,
NULL, &prop_errors);
ioctl_errno = ioctl_err;
prop_errflags = errflags;
if (err == 0) {
nvpair_t *prop_err = NULL;
while ((prop_err = nvlist_next_nvpair(prop_errors,
prop_err)) != NULL) {
char tbuf[1024];
zfs_prop_t prop;
int intval;
prop = zfs_name_to_prop(nvpair_name(prop_err));
(void) nvpair_value_int32(prop_err, &intval);
if (strcmp(nvpair_name(prop_err),
ZPROP_N_MORE_ERRORS) == 0) {
trunc_prop_errs(intval);
break;
} else if (snapname == NULL || finalsnap == NULL ||
strcmp(finalsnap, snapname) == 0 ||
strcmp(nvpair_name(prop_err),
zfs_prop_to_name(ZFS_PROP_REFQUOTA)) != 0) {
/*
* Skip the special case of, for example,
* "refquota", errors on intermediate
* snapshots leading up to a final one.
* That's why we have all of the checks above.
*
* See zfs_ioctl.c's extract_delay_props() for
* a list of props which can fail on
* intermediate snapshots, but shouldn't
* affect the overall receive.
*/
(void) snprintf(tbuf, sizeof (tbuf),
dgettext(TEXT_DOMAIN,
"cannot receive %s property on %s"),
nvpair_name(prop_err), name);
zfs_setprop_error(hdl, prop, intval, tbuf);
}
}
}
if (err == 0 && snapprops_nvlist) {
zfs_cmd_t zc = {"\0"};
(void) strcpy(zc.zc_name, destsnap);
zc.zc_cookie = B_TRUE; /* received */
if (zcmd_write_src_nvlist(hdl, &zc, snapprops_nvlist) == 0) {
(void) zfs_ioctl(hdl, ZFS_IOC_SET_PROP, &zc);
zcmd_free_nvlists(&zc);
}
}
if (err == 0 && snapholds_nvlist) {
nvpair_t *pair;
nvlist_t *holds, *errors = NULL;
int cleanup_fd = -1;
VERIFY(0 == nvlist_alloc(&holds, 0, KM_SLEEP));
for (pair = nvlist_next_nvpair(snapholds_nvlist, NULL);
pair != NULL;
pair = nvlist_next_nvpair(snapholds_nvlist, pair)) {
VERIFY(0 == nvlist_add_string(holds, destsnap,
nvpair_name(pair)));
}
(void) lzc_hold(holds, cleanup_fd, &errors);
nvlist_free(snapholds_nvlist);
nvlist_free(holds);
}
if (err && (ioctl_errno == ENOENT || ioctl_errno == EEXIST)) {
/*
* It may be that this snapshot already exists,
* in which case we want to consume & ignore it
* rather than failing.
*/
avl_tree_t *local_avl;
nvlist_t *local_nv, *fs;
cp = strchr(destsnap, '@');
/*
* XXX Do this faster by just iterating over snaps in
* this fs. Also if zc_value does not exist, we will
* get a strange "does not exist" error message.
*/
*cp = '\0';
if (gather_nvlist(hdl, destsnap, NULL, NULL, B_FALSE, B_TRUE,
B_FALSE, B_FALSE, B_FALSE, B_FALSE, B_FALSE, B_TRUE,
&local_nv, &local_avl) == 0) {
*cp = '@';
fs = fsavl_find(local_avl, drrb->drr_toguid, NULL);
fsavl_destroy(local_avl);
nvlist_free(local_nv);
if (fs != NULL) {
if (flags->verbose) {
(void) printf("snap %s already exists; "
"ignoring\n", destsnap);
}
err = ioctl_err = recv_skip(hdl, infd,
flags->byteswap);
}
}
*cp = '@';
}
if (ioctl_err != 0) {
switch (ioctl_errno) {
case ENODEV:
cp = strchr(destsnap, '@');
*cp = '\0';
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"most recent snapshot of %s does not\n"
"match incremental source"), destsnap);
(void) zfs_error(hdl, EZFS_BADRESTORE, errbuf);
*cp = '@';
break;
case ETXTBSY:
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"destination %s has been modified\n"
"since most recent snapshot"), name);
(void) zfs_error(hdl, EZFS_BADRESTORE, errbuf);
break;
case EACCES:
if (raw && stream_wantsnewfs) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"failed to create encryption key"));
} else if (raw && !stream_wantsnewfs) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"encryption key does not match "
"existing key"));
} else {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"inherited key must be loaded"));
}
(void) zfs_error(hdl, EZFS_CRYPTOFAILED, errbuf);
break;
case EEXIST:
cp = strchr(destsnap, '@');
if (newfs) {
/* it's the containing fs that exists */
*cp = '\0';
}
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"destination already exists"));
(void) zfs_error_fmt(hdl, EZFS_EXISTS,
dgettext(TEXT_DOMAIN, "cannot restore to %s"),
destsnap);
*cp = '@';
break;
case EINVAL:
if (flags->resumable) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"kernel modules must be upgraded to "
"receive this stream."));
} else if (embedded && !raw) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"incompatible embedded data stream "
"feature with encrypted receive."));
}
(void) zfs_error(hdl, EZFS_BADSTREAM, errbuf);
break;
case ECKSUM:
case ZFS_ERR_STREAM_TRUNCATED:
recv_ecksum_set_aux(hdl, destsnap, flags->resumable,
ioctl_err == ECKSUM);
(void) zfs_error(hdl, EZFS_BADSTREAM, errbuf);
break;
case ZFS_ERR_STREAM_LARGE_BLOCK_MISMATCH:
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"incremental send stream requires -L "
"(--large-block), to match previous receive."));
(void) zfs_error(hdl, EZFS_BADSTREAM, errbuf);
break;
case ENOTSUP:
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"pool must be upgraded to receive this stream."));
(void) zfs_error(hdl, EZFS_BADVERSION, errbuf);
break;
case EDQUOT:
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"destination %s space quota exceeded."), name);
(void) zfs_error(hdl, EZFS_NOSPC, errbuf);
break;
case ZFS_ERR_FROM_IVSET_GUID_MISSING:
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"IV set guid missing. See errata %u at "
"https://openzfs.github.io/openzfs-docs/msg/"
"ZFS-8000-ER."),
ZPOOL_ERRATA_ZOL_8308_ENCRYPTION);
(void) zfs_error(hdl, EZFS_BADSTREAM, errbuf);
break;
case ZFS_ERR_FROM_IVSET_GUID_MISMATCH:
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"IV set guid mismatch. See the 'zfs receive' "
"man page section\n discussing the limitations "
"of raw encrypted send streams."));
(void) zfs_error(hdl, EZFS_BADSTREAM, errbuf);
break;
case ZFS_ERR_SPILL_BLOCK_FLAG_MISSING:
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"Spill block flag missing for raw send.\n"
"The zfs software on the sending system must "
"be updated."));
(void) zfs_error(hdl, EZFS_BADSTREAM, errbuf);
break;
case EBUSY:
if (hastoken) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"destination %s contains "
"partially-complete state from "
"\"zfs receive -s\"."), name);
(void) zfs_error(hdl, EZFS_BUSY, errbuf);
break;
}
/* fallthru */
default:
(void) zfs_standard_error(hdl, ioctl_errno, errbuf);
}
}
/*
* Mount the target filesystem (if created). Also mount any
* children of the target filesystem if we did a replication
* receive (indicated by stream_avl being non-NULL).
*/
if (clp) {
if (!flags->nomount)
err |= changelist_postfix(clp);
changelist_free(clp);
}
if ((newfs || stream_avl) && type == ZFS_TYPE_FILESYSTEM && !redacted)
flags->domount = B_TRUE;
if (prop_errflags & ZPROP_ERR_NOCLEAR) {
(void) fprintf(stderr, dgettext(TEXT_DOMAIN, "Warning: "
"failed to clear unreceived properties on %s"), name);
(void) fprintf(stderr, "\n");
}
if (prop_errflags & ZPROP_ERR_NORESTORE) {
(void) fprintf(stderr, dgettext(TEXT_DOMAIN, "Warning: "
"failed to restore original properties on %s"), name);
(void) fprintf(stderr, "\n");
}
if (err || ioctl_err) {
err = -1;
goto out;
}
if (flags->verbose) {
char buf1[64];
char buf2[64];
uint64_t bytes = read_bytes;
time_t delta = time(NULL) - begin_time;
if (delta == 0)
delta = 1;
zfs_nicebytes(bytes, buf1, sizeof (buf1));
zfs_nicebytes(bytes/delta, buf2, sizeof (buf1));
(void) printf("received %s stream in %lld seconds (%s/sec)\n",
buf1, (longlong_t)delta, buf2);
}
err = 0;
out:
if (prop_errors != NULL)
nvlist_free(prop_errors);
if (tmp_keylocation[0] != '\0') {
VERIFY(0 == nvlist_add_string(rcvprops,
zfs_prop_to_name(ZFS_PROP_KEYLOCATION), tmp_keylocation));
}
if (newprops)
nvlist_free(rcvprops);
nvlist_free(oxprops);
nvlist_free(origprops);
return (err);
}
/*
* Check properties we were asked to override (both -o|-x)
*/
static boolean_t
zfs_receive_checkprops(libzfs_handle_t *hdl, nvlist_t *props,
const char *errbuf)
{
nvpair_t *nvp;
zfs_prop_t prop;
const char *name;
nvp = NULL;
while ((nvp = nvlist_next_nvpair(props, nvp)) != NULL) {
name = nvpair_name(nvp);
prop = zfs_name_to_prop(name);
if (prop == ZPROP_INVAL) {
if (!zfs_prop_user(name)) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"invalid property '%s'"), name);
return (B_FALSE);
}
continue;
}
/*
* "origin" is readonly but is used to receive datasets as
* clones so we don't raise an error here
*/
if (prop == ZFS_PROP_ORIGIN)
continue;
/* encryption params have their own verification later */
if (prop == ZFS_PROP_ENCRYPTION ||
zfs_prop_encryption_key_param(prop))
continue;
/*
* cannot override readonly, set-once and other specific
* settable properties
*/
if (zfs_prop_readonly(prop) || prop == ZFS_PROP_VERSION ||
prop == ZFS_PROP_VOLSIZE) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"invalid property '%s'"), name);
return (B_FALSE);
}
}
return (B_TRUE);
}
static int
zfs_receive_impl(libzfs_handle_t *hdl, const char *tosnap,
const char *originsnap, recvflags_t *flags, int infd, const char *sendfs,
nvlist_t *stream_nv, avl_tree_t *stream_avl, char **top_zfs,
const char *finalsnap, nvlist_t *cmdprops)
{
int err;
dmu_replay_record_t drr, drr_noswap;
struct drr_begin *drrb = &drr.drr_u.drr_begin;
char errbuf[1024];
zio_cksum_t zcksum = { { 0 } };
uint64_t featureflags;
int hdrtype;
(void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
"cannot receive"));
/* check cmdline props, raise an error if they cannot be received */
if (!zfs_receive_checkprops(hdl, cmdprops, errbuf)) {
return (zfs_error(hdl, EZFS_BADPROP, errbuf));
}
if (flags->isprefix &&
!zfs_dataset_exists(hdl, tosnap, ZFS_TYPE_DATASET)) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "specified fs "
"(%s) does not exist"), tosnap);
return (zfs_error(hdl, EZFS_NOENT, errbuf));
}
if (originsnap &&
!zfs_dataset_exists(hdl, originsnap, ZFS_TYPE_DATASET)) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "specified origin fs "
"(%s) does not exist"), originsnap);
return (zfs_error(hdl, EZFS_NOENT, errbuf));
}
/* read in the BEGIN record */
if (0 != (err = recv_read(hdl, infd, &drr, sizeof (drr), B_FALSE,
&zcksum)))
return (err);
if (drr.drr_type == DRR_END || drr.drr_type == BSWAP_32(DRR_END)) {
/* It's the double end record at the end of a package */
return (ENODATA);
}
/* the kernel needs the non-byteswapped begin record */
drr_noswap = drr;
flags->byteswap = B_FALSE;
if (drrb->drr_magic == BSWAP_64(DMU_BACKUP_MAGIC)) {
/*
* We computed the checksum in the wrong byteorder in
* recv_read() above; do it again correctly.
*/
bzero(&zcksum, sizeof (zio_cksum_t));
fletcher_4_incremental_byteswap(&drr, sizeof (drr), &zcksum);
flags->byteswap = B_TRUE;
drr.drr_type = BSWAP_32(drr.drr_type);
drr.drr_payloadlen = BSWAP_32(drr.drr_payloadlen);
drrb->drr_magic = BSWAP_64(drrb->drr_magic);
drrb->drr_versioninfo = BSWAP_64(drrb->drr_versioninfo);
drrb->drr_creation_time = BSWAP_64(drrb->drr_creation_time);
drrb->drr_type = BSWAP_32(drrb->drr_type);
drrb->drr_flags = BSWAP_32(drrb->drr_flags);
drrb->drr_toguid = BSWAP_64(drrb->drr_toguid);
drrb->drr_fromguid = BSWAP_64(drrb->drr_fromguid);
}
if (drrb->drr_magic != DMU_BACKUP_MAGIC || drr.drr_type != DRR_BEGIN) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "invalid "
"stream (bad magic number)"));
return (zfs_error(hdl, EZFS_BADSTREAM, errbuf));
}
featureflags = DMU_GET_FEATUREFLAGS(drrb->drr_versioninfo);
hdrtype = DMU_GET_STREAM_HDRTYPE(drrb->drr_versioninfo);
if (!DMU_STREAM_SUPPORTED(featureflags) ||
(hdrtype != DMU_SUBSTREAM && hdrtype != DMU_COMPOUNDSTREAM)) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"stream has unsupported feature, feature flags = %lx"),
featureflags);
return (zfs_error(hdl, EZFS_BADSTREAM, errbuf));
}
/* Holds feature is set once in the compound stream header. */
if (featureflags & DMU_BACKUP_FEATURE_HOLDS)
flags->holds = B_TRUE;
if (strchr(drrb->drr_toname, '@') == NULL) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "invalid "
"stream (bad snapshot name)"));
return (zfs_error(hdl, EZFS_BADSTREAM, errbuf));
}
if (DMU_GET_STREAM_HDRTYPE(drrb->drr_versioninfo) == DMU_SUBSTREAM) {
char nonpackage_sendfs[ZFS_MAX_DATASET_NAME_LEN];
if (sendfs == NULL) {
/*
* We were not called from zfs_receive_package(). Get
* the fs specified by 'zfs send'.
*/
char *cp;
(void) strlcpy(nonpackage_sendfs,
drr.drr_u.drr_begin.drr_toname,
sizeof (nonpackage_sendfs));
if ((cp = strchr(nonpackage_sendfs, '@')) != NULL)
*cp = '\0';
sendfs = nonpackage_sendfs;
VERIFY(finalsnap == NULL);
}
return (zfs_receive_one(hdl, infd, tosnap, originsnap, flags,
&drr, &drr_noswap, sendfs, stream_nv, stream_avl, top_zfs,
finalsnap, cmdprops));
} else {
assert(DMU_GET_STREAM_HDRTYPE(drrb->drr_versioninfo) ==
DMU_COMPOUNDSTREAM);
return (zfs_receive_package(hdl, infd, tosnap, flags, &drr,
&zcksum, top_zfs, cmdprops));
}
}
/*
* Restores a backup of tosnap from the file descriptor specified by infd.
* Return 0 on total success, -2 if some things couldn't be
* destroyed/renamed/promoted, -1 if some things couldn't be received.
* (-1 will override -2, if -1 and the resumable flag was specified the
* transfer can be resumed if the sending side supports it).
*/
int
zfs_receive(libzfs_handle_t *hdl, const char *tosnap, nvlist_t *props,
recvflags_t *flags, int infd, avl_tree_t *stream_avl)
{
char *top_zfs = NULL;
int err;
struct stat sb;
char *originsnap = NULL;
/*
* The only way fstat can fail is if we do not have a valid file
* descriptor.
*/
if (fstat(infd, &sb) == -1) {
perror("fstat");
return (-2);
}
/*
* It is not uncommon for gigabytes to be processed in zfs receive.
* Speculatively increase the buffer size if supported by the platform.
*/
if (S_ISFIFO(sb.st_mode))
libzfs_set_pipe_max(infd);
if (props) {
err = nvlist_lookup_string(props, "origin", &originsnap);
if (err && err != ENOENT)
return (err);
}
err = zfs_receive_impl(hdl, tosnap, originsnap, flags, infd, NULL, NULL,
stream_avl, &top_zfs, NULL, props);
if (err == 0 && !flags->nomount && flags->domount && top_zfs) {
zfs_handle_t *zhp = NULL;
prop_changelist_t *clp = NULL;
zhp = zfs_open(hdl, top_zfs,
ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME);
if (zhp == NULL) {
err = -1;
goto out;
} else {
if (zhp->zfs_type == ZFS_TYPE_VOLUME) {
zfs_close(zhp);
goto out;
}
clp = changelist_gather(zhp, ZFS_PROP_MOUNTPOINT,
CL_GATHER_MOUNT_ALWAYS,
flags->forceunmount ? MS_FORCE : 0);
zfs_close(zhp);
if (clp == NULL) {
err = -1;
goto out;
}
/* mount and share received datasets */
err = changelist_postfix(clp);
changelist_free(clp);
if (err != 0)
err = -1;
}
}
out:
if (top_zfs)
free(top_zfs);
return (err);
}
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