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libzfs_sendrecv.c
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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 https://opensource.org/licenses/CDDL-1.0.
* 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 <[email protected]>.
* All rights reserved
* Copyright (c) 2013 Steven Hartland. All rights reserved.
* Copyright 2015, OmniTI Computer Consulting, Inc. All rights reserved.
* Copyright 2016 Igor Kozhukhov <[email protected]>
* Copyright (c) 2018, loli10K <[email protected]>. All rights reserved.
* Copyright (c) 2019 Datto Inc.
* Copyright (c) 2024, Klara, Inc.
*/
#include <assert.h>
#include <ctype.h>
#include <errno.h>
#include <libintl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.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 <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;
boolean_t pa_astitle;
boolean_t pa_progress;
uint64_t pa_size;
} progress_arg_t;
static int
dump_record(dmu_replay_record_t *drr, void *payload, size_t 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;
const 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, const 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;
nvfs = fnvpair_value_nvlist(fselem);
snaps = fnvlist_lookup_nvlist(nvfs, "snaps");
while ((snapelem =
nvlist_next_nvpair(snaps, snapelem)) != NULL) {
fsavl_node_t *fn;
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 = fnvpair_value_uint64(snapelem);
/*
* Note: if there are multiple snaps with the
* same GUID, we ignore all but one.
*/
avl_index_t where = 0;
if (avl_find(fsavl, fn, &where) == NULL)
avl_insert(fsavl, fn, where);
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 skipmissing;
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);
/*
* Collect guid, valid props, optionally holds, etc. of a snapshot.
* This interface is intended for use as a zfs_iter_snapshots_v2_sorted visitor.
*/
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;
boolean_t isfromsnap, istosnap, istosnapwithnofrom;
char *snapname;
const char *from = sd->fromsnap;
const char *to = sd->tosnap;
snapname = strrchr(zhp->zfs_name, '@');
assert(snapname != NULL);
++snapname;
isfromsnap = (from != NULL && strcmp(from, snapname) == 0);
istosnap = (to != NULL && strcmp(to, snapname) == 0);
istosnapwithnofrom = (istosnap && from == 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, to);
}
zfs_close(zhp);
return (0);
}
fnvlist_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) {
/*
* To allow a doall stream to work properly
* with a NULL fromsnap
*/
if (sd->doall && from == NULL && !sd->seenfrom)
sd->seenfrom = B_TRUE;
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;
}
nvlist_t *nv = fnvlist_alloc();
send_iterate_prop(zhp, sd->backup, nv);
fnvlist_add_nvlist(sd->snapprops, snapname, nv);
fnvlist_free(nv);
if (sd->holds) {
nvlist_t *holds;
if (lzc_get_holds(zhp->zfs_name, &holds) == 0) {
fnvlist_add_nvlist(sd->snapholds, snapname, holds);
fnvlist_free(holds);
}
}
zfs_close(zhp);
return (0);
}
/*
* Collect all valid props from the handle snap into an nvlist.
*/
static void
send_iterate_prop(zfs_handle_t *zhp, boolean_t received_only, nvlist_t *nv)
{
nvlist_t *props;
if (received_only)
props = zfs_get_recvd_props(zhp);
else
props = zhp->zfs_props;
nvpair_t *elem = NULL;
while ((elem = nvlist_next_nvpair(props, elem)) != NULL) {
const char *propname = nvpair_name(elem);
zfs_prop_t prop = zfs_name_to_prop(propname);
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;
}
nvlist_t *propnv = fnvpair_value_nvlist(elem);
boolean_t isspacelimit = (prop == ZFS_PROP_QUOTA ||
prop == ZFS_PROP_RESERVATION ||
prop == ZFS_PROP_REFQUOTA ||
prop == ZFS_PROP_REFRESERVATION);
if (isspacelimit && zhp->zfs_type == ZFS_TYPE_SNAPSHOT)
continue;
const char *source;
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 {
/*
* May have no source before SPA_VERSION_RECVD_PROPS,
* but is still modifiable.
*/
if (!isspacelimit)
continue;
}
if (zfs_prop_user(propname) ||
zfs_prop_get_type(prop) == PROP_TYPE_STRING) {
const char *value;
value = fnvlist_lookup_string(propnv, ZPROP_VALUE);
fnvlist_add_string(nv, propname, value);
} else {
uint64_t value;
value = fnvlist_lookup_uint64(propnv, ZPROP_VALUE);
fnvlist_add_uint64(nv, propname, value);
}
}
}
/*
* returns snapshot guid
* and returns 0 if the snapshot does not exist
*/
static uint64_t
get_snap_guid(libzfs_handle_t *hdl, const char *fs, const char *snap)
{
char name[MAXPATHLEN + 1];
uint64_t guid = 0;
if (fs == NULL || fs[0] == '\0' || snap == NULL || snap[0] == '\0')
return (guid);
(void) snprintf(name, sizeof (name), "%s@%s", fs, snap);
zfs_handle_t *zhp = zfs_open(hdl, name, ZFS_TYPE_SNAPSHOT);
if (zhp != NULL) {
guid = zfs_prop_get_int(zhp, ZFS_PROP_GUID);
zfs_close(zhp);
}
return (guid);
}
/*
* 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 txg = zhp->zfs_dmustats.dds_creation_txg;
uint64_t guid = zhp->zfs_dmustats.dds_guid;
uint64_t fromsnap_txg, tosnap_txg;
char guidstring[64];
/* These fields are restored on return from a recursive call. */
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;
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, unless --skip-missing specified. Then
* just print a warning.
*/
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 if (sd->skipmissing) {
(void) fprintf(stderr, dgettext(TEXT_DOMAIN,
"WARNING: skipping dataset %s and its children:"
" 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] != '\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);
fnvlist_add_nvlist(nvfs, "props", 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;
}
}
/*
* Iterate over snaps, and set sd->parent_fromsnap_guid.
*
* 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.
*/
sd->parent_fromsnap_guid = 0;
sd->parent_snaps = fnvlist_alloc();
sd->snapprops = fnvlist_alloc();
if (sd->holds)
sd->snapholds = fnvlist_alloc();
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_v2(zhp, 0, 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_free(sd->parent_snaps);
fnvlist_add_nvlist(nvfs, "snapprops", sd->snapprops);
fnvlist_free(sd->snapprops);
if (sd->holds) {
fnvlist_add_nvlist(nvfs, "snapholds", sd->snapholds);
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_v2(zhp, 0, send_iterate_fs, sd);
out:
/* Restore saved fields. */
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 skipmissing, 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);
sd.fss = fnvlist_alloc();
sd.fsname = fsname;
sd.fromsnap = fromsnap;
sd.tosnap = tosnap;
sd.recursive = recursive;
sd.raw = raw;
sd.doall = doall;
sd.replicate = replicate;
sd.skipmissing = skipmissing;
sd.verbose = verbose;
sd.backup = backup;
sd.holds = holds;
sd.props = props;
if ((error = send_iterate_fs(zhp, &sd)) != 0) {
fnvlist_free(sd.fss);
if (avlp != NULL)
*avlp = NULL;
*nvlp = NULL;
return (error);
}
if (avlp != NULL && (*avlp = fsavl_create(sd.fss)) == NULL) {
fnvlist_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;
boolean_t progressastitle;
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)
{
assert(snapname != NULL);
int error = lzc_send_space(snapname, from, flags, spacep);
if (error == 0)
return (0);
char errbuf[ERRBUFLEN];
(void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
"warning: cannot estimate space for '%s'"), snapname);
libzfs_handle_t *hdl = zhp->zfs_hdl;
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, "%s", zfs_strerror(error));
return (zfs_error(hdl, EZFS_BADBACKUP, errbuf));
default:
return (zfs_standard_error(hdl, error, errbuf));
}
}
/*
* 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;
if (debugnv != NULL) {
thisdbg = fnvlist_alloc();
if (fromsnap != NULL && fromsnap[0] != '\0')
fnvlist_add_string(thisdbg, "fromsnap", fromsnap);
}
if (zfs_ioctl(zhp->zfs_hdl, ZFS_IOC_SEND, &zc) != 0) {
char errbuf[ERRBUFLEN];
int error = errno;
(void) snprintf(errbuf, sizeof (errbuf), "%s '%s'",
dgettext(TEXT_DOMAIN, "warning: cannot send"),
zhp->zfs_name);
if (debugnv != NULL) {
fnvlist_add_uint64(thisdbg, "error", error);
fnvlist_add_nvlist(debugnv, zhp->zfs_name, thisdbg);
fnvlist_free(thisdbg);
}
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 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:
case EINVAL:
zfs_error_aux(hdl, "%s", zfs_strerror(errno));
return (zfs_error(hdl, EZFS_BADBACKUP, errbuf));
default:
return (zfs_standard_error(hdl, errno, errbuf));
}
}
if (debugnv != NULL) {
fnvlist_add_nvlist(debugnv, zhp->zfs_name, thisdbg);
fnvlist_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"};
if (bytes_written != NULL)
*bytes_written = 0;
if (blocks_visited != NULL)
*blocks_visited = 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 volatile boolean_t send_progress_thread_signal_duetotimer;
static void
send_progress_thread_act(int sig, siginfo_t *info, void *ucontext)
{
(void) sig, (void) ucontext;
send_progress_thread_signal_duetotimer = info->si_code == SI_TIMER;
}
struct timer_desirability {
timer_t timer;
boolean_t desired;
};
static void
timer_delete_cleanup(void *timer)
{
struct timer_desirability *td = timer;
if (td->desired)
timer_delete(td->timer);
}
#ifdef SIGINFO
#define SEND_PROGRESS_THREAD_PARENT_BLOCK_SIGINFO sigaddset(&new, SIGINFO)
#else
#define SEND_PROGRESS_THREAD_PARENT_BLOCK_SIGINFO
#endif
#define SEND_PROGRESS_THREAD_PARENT_BLOCK(old) { \
sigset_t new; \
sigemptyset(&new); \
sigaddset(&new, SIGUSR1); \
SEND_PROGRESS_THREAD_PARENT_BLOCK_SIGINFO; \
pthread_sigmask(SIG_BLOCK, &new, old); \
}
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;
uint64_t total = pa->pa_size / 100;
char buf[16];
time_t t;
struct tm tm;
int err;
const struct sigaction signal_action =
{.sa_sigaction = send_progress_thread_act, .sa_flags = SA_SIGINFO};
struct sigevent timer_cfg =
{.sigev_notify = SIGEV_SIGNAL, .sigev_signo = SIGUSR1};
const struct itimerspec timer_time =
{.it_value = {.tv_sec = 1}, .it_interval = {.tv_sec = 1}};
struct timer_desirability timer = {};
sigaction(SIGUSR1, &signal_action, NULL);
#ifdef SIGINFO
sigaction(SIGINFO, &signal_action, NULL);
#endif
if ((timer.desired = pa->pa_progress || pa->pa_astitle)) {
if (timer_create(CLOCK_MONOTONIC, &timer_cfg, &timer.timer))
return ((void *)(uintptr_t)errno);
(void) timer_settime(timer.timer, 0, &timer_time, NULL);
}
pthread_cleanup_push(timer_delete_cleanup, &timer);
if (!pa->pa_parsable && pa->pa_progress) {
(void) fprintf(stderr,
"TIME %s %sSNAPSHOT %s\n",