libzfs_sendrecv.c revision 8f38d41910063e19709864b025684a228961299f
/*
* 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 2008 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include <assert.h>
#include <ctype.h>
#include <errno.h>
#include <libdevinfo.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 <stddef.h>
#include <libzfs.h>
#include "zfs_namecheck.h"
#include "zfs_prop.h"
#include "libzfs_impl.h"
#include <fletcher.c> /* XXX */
/*
* 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 = arg1;
const fsavl_node_t *fn2 = arg2;
if (fn1->fn_guid > fn2->fn_guid)
return (+1);
else if (fn1->fn_guid < fn2->fn_guid)
return (-1);
else
return (0);
}
/*
* 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 avl_tree_t *
fsavl_create(nvlist_t *fss)
{
avl_tree_t *fsavl;
nvpair_t *fselem = NULL;
fsavl = malloc(sizeof (avl_tree_t));
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));
fn = malloc(sizeof (fsavl_node_t));
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);
}
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);
}
/*
* Routines for dealing with the giant nvlist of fs-nvlists, etc.
*/
typedef struct send_data {
uint64_t parent_fromsnap_guid;
nvlist_t *parent_snaps;
nvlist_t *fss;
const char *fromsnap;
const char *tosnap;
/*
* 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) }
*
* "origin" -> number (guid) (if clone)
* "sent" -> boolean (not on-disk)
* }
* }
* }
*
*/
} send_data_t;
static int
send_iterate_snap(zfs_handle_t *zhp, void *arg)
{
send_data_t *sd = arg;
uint64_t guid = zhp->zfs_dmustats.dds_guid;
char *snapname;
snapname = strrchr(zhp->zfs_name, '@')+1;
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 ((sd->fromsnap && strcmp(snapname, sd->fromsnap) == 0) ||
(sd->parent_fromsnap_guid == 0 && sd->tosnap &&
strcmp(snapname, sd->tosnap) == 0)) {
sd->parent_fromsnap_guid = guid;
}
zfs_close(zhp);
return (0);
}
static void
send_iterate_prop(zfs_handle_t *zhp, nvlist_t *nv)
{
nvpair_t *elem = NULL;
while ((elem = nvlist_next_nvpair(zhp->zfs_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) && zfs_prop_readonly(prop))
continue;
verify(nvpair_value_nvlist(elem, &propnv) == 0);
if (prop == ZFS_PROP_QUOTA || prop == ZFS_PROP_RESERVATION) {
/* these guys are modifyable, but have no source */
uint64_t value;
verify(nvlist_lookup_uint64(propnv,
ZPROP_VALUE, &value) == 0);
} else {
char *source;
if (nvlist_lookup_string(propnv,
ZPROP_SOURCE, &source) != 0)
continue;
if (strcmp(source, zhp->zfs_name) != 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));
}
}
}
static int
send_iterate_fs(zfs_handle_t *zhp, void *arg)
{
send_data_t *sd = arg;
nvlist_t *nvfs, *nv;
int rv;
uint64_t parent_fromsnap_guid_save = sd->parent_fromsnap_guid;
uint64_t guid = zhp->zfs_dmustats.dds_guid;
char guidstring[64];
VERIFY(0 == nvlist_alloc(&nvfs, NV_UNIQUE_NAME, 0));
VERIFY(0 == nvlist_add_string(nvfs, "name", zhp->zfs_name));
VERIFY(0 == nvlist_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)
return (-1);
VERIFY(0 == nvlist_add_uint64(nvfs, "origin",
origin->zfs_dmustats.dds_guid));
}
/* iterate over props */
VERIFY(0 == nvlist_alloc(&nv, NV_UNIQUE_NAME, 0));
send_iterate_prop(zhp, nv);
VERIFY(0 == nvlist_add_nvlist(nvfs, "props", nv));
nvlist_free(nv);
/* iterate over snaps, and set sd->parent_fromsnap_guid */
sd->parent_fromsnap_guid = 0;
VERIFY(0 == nvlist_alloc(&sd->parent_snaps, NV_UNIQUE_NAME, 0));
(void) zfs_iter_snapshots(zhp, send_iterate_snap, sd);
VERIFY(0 == nvlist_add_nvlist(nvfs, "snaps", sd->parent_snaps));
nvlist_free(sd->parent_snaps);
/* add this fs to nvlist */
(void) snprintf(guidstring, sizeof (guidstring),
"0x%llx", (longlong_t)guid);
VERIFY(0 == nvlist_add_nvlist(sd->fss, guidstring, nvfs));
nvlist_free(nvfs);
/* iterate over children */
rv = zfs_iter_filesystems(zhp, send_iterate_fs, sd);
sd->parent_fromsnap_guid = parent_fromsnap_guid_save;
zfs_close(zhp);
return (rv);
}
static int
gather_nvlist(libzfs_handle_t *hdl, const char *fsname, const char *fromsnap,
const char *tosnap, 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.fromsnap = fromsnap;
sd.tosnap = tosnap;
error = send_iterate_fs(zhp, &sd);
*nvlp = sd.fss;
if (avlp)
*avlp = fsavl_create(sd.fss);
return (error);
}
/*
* Routines for dealing with the sorted snapshot functionality
*/
typedef struct zfs_node {
zfs_handle_t *zn_handle;
avl_node_t zn_avlnode;
} zfs_node_t;
static int
zfs_sort_snaps(zfs_handle_t *zhp, void *data)
{
avl_tree_t *avl = data;
zfs_node_t *node = zfs_alloc(zhp->zfs_hdl, sizeof (zfs_node_t));
node->zn_handle = zhp;
avl_add(avl, node);
return (0);
}
/* ARGSUSED */
static int
zfs_snapshot_compare(const void *larg, const void *rarg)
{
zfs_handle_t *l = ((zfs_node_t *)larg)->zn_handle;
zfs_handle_t *r = ((zfs_node_t *)rarg)->zn_handle;
uint64_t lcreate, rcreate;
/*
* Sort them according to creation time. We use the hidden
* CREATETXG property to get an absolute ordering of snapshots.
*/
lcreate = zfs_prop_get_int(l, ZFS_PROP_CREATETXG);
rcreate = zfs_prop_get_int(r, ZFS_PROP_CREATETXG);
if (lcreate < rcreate)
return (-1);
else if (lcreate > rcreate)
return (+1);
else
return (0);
}
static int
zfs_iter_snapshots_sorted(zfs_handle_t *zhp, zfs_iter_f callback, void *data)
{
int ret = 0;
zfs_node_t *node;
avl_tree_t avl;
void *cookie = NULL;
avl_create(&avl, zfs_snapshot_compare,
sizeof (zfs_node_t), offsetof(zfs_node_t, zn_avlnode));
ret = zfs_iter_snapshots(zhp, zfs_sort_snaps, &avl);
for (node = avl_first(&avl); node != NULL; node = AVL_NEXT(&avl, node))
ret |= callback(node->zn_handle, data);
while ((node = avl_destroy_nodes(&avl, &cookie)) != NULL)
free(node);
avl_destroy(&avl);
return (ret);
}
/*
* 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 lastsnap[ZFS_MAXNAMELEN];
boolean_t seenfrom, seento, replicate, doall, fromorigin;
boolean_t verbose;
int outfd;
boolean_t err;
nvlist_t *fss;
avl_tree_t *fsavl;
} send_dump_data_t;
/*
* 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, boolean_t fromorigin,
int outfd)
{
zfs_cmd_t zc = { 0 };
libzfs_handle_t *hdl = zhp->zfs_hdl;
assert(zhp->zfs_type == ZFS_TYPE_SNAPSHOT);
assert(fromsnap == NULL || fromsnap[0] == '\0' || !fromorigin);
(void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
if (fromsnap)
(void) strlcpy(zc.zc_value, fromsnap, sizeof (zc.zc_value));
zc.zc_cookie = outfd;
zc.zc_obj = fromorigin;
if (ioctl(zhp->zfs_hdl->libzfs_fd, ZFS_IOC_SEND, &zc) != 0) {
char errbuf[1024];
(void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
"warning: cannot send '%s'"), zhp->zfs_name);
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:
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));
}
}
return (0);
}
static int
dump_snapshot(zfs_handle_t *zhp, void *arg)
{
send_dump_data_t *sdd = arg;
const char *thissnap;
int err;
thissnap = strchr(zhp->zfs_name, '@') + 1;
if (sdd->fromsnap && !sdd->seenfrom &&
strcmp(sdd->fromsnap, thissnap) == 0) {
sdd->seenfrom = B_TRUE;
(void) strcpy(sdd->lastsnap, thissnap);
zfs_close(zhp);
return (0);
}
if (sdd->seento || !sdd->seenfrom) {
zfs_close(zhp);
return (0);
}
/* send it */
if (sdd->verbose) {
(void) fprintf(stderr, "sending from @%s to %s\n",
sdd->lastsnap, zhp->zfs_name);
}
err = dump_ioctl(zhp, sdd->lastsnap,
sdd->lastsnap[0] == '\0' && (sdd->fromorigin || sdd->replicate),
sdd->outfd);
if (!sdd->seento && strcmp(sdd->tosnap, thissnap) == 0)
sdd->seento = B_TRUE;
(void) strcpy(sdd->lastsnap, thissnap);
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 };
(void) snprintf(zc.zc_name, sizeof (zc.zc_name), "%s@%s",
zhp->zfs_name, sdd->tosnap);
if (ioctl(zhp->zfs_hdl->libzfs_fd, ZFS_IOC_OBJSET_STATS, &zc) != 0) {
(void) fprintf(stderr, "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 (ioctl(zhp->zfs_hdl->libzfs_fd,
ZFS_IOC_OBJSET_STATS, &zc) != 0) {
missingfrom = B_TRUE;
}
}
if (sdd->doall) {
sdd->seenfrom = sdd->seento = sdd->lastsnap[0] = 0;
if (sdd->fromsnap == NULL || missingfrom)
sdd->seenfrom = B_TRUE;
rv = zfs_iter_snapshots_sorted(zhp, dump_snapshot, arg);
if (!sdd->seenfrom) {
(void) fprintf(stderr,
"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) {
(void) fprintf(stderr,
"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);
sdd->err = B_TRUE;
}
} else {
zfs_handle_t *snapzhp;
char snapname[ZFS_MAXNAMELEN];
(void) snprintf(snapname, sizeof (snapname), "%s@%s",
zfs_get_name(zhp), sdd->tosnap);
snapzhp = zfs_open(zhp->zfs_hdl, snapname, ZFS_TYPE_SNAPSHOT);
rv = dump_ioctl(snapzhp,
missingfrom ? NULL : sdd->fromsnap,
sdd->fromorigin || missingfrom,
sdd->outfd);
sdd->seento = B_TRUE;
zfs_close(snapzhp);
}
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));
again:
needagain = progress = B_FALSE;
for (fspair = nvlist_next_nvpair(sdd->fss, NULL); fspair;
fspair = nvlist_next_nvpair(sdd->fss, fspair)) {
nvlist_t *fslist;
char *fsname;
zfs_handle_t *zhp;
int err;
uint64_t origin_guid = 0;
nvlist_t *origin_nv;
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);
origin_nv = fsavl_find(sdd->fsavl, origin_guid, NULL);
if (origin_nv &&
nvlist_lookup_boolean(origin_nv, "sent") == ENOENT) {
/*
* origin has not been sent yet;
* skip this clone.
*/
needagain = B_TRUE;
continue;
}
zhp = zfs_open(rzhp->zfs_hdl, fsname, ZFS_TYPE_DATASET);
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;
}
return (0);
}
/*
* Dumps a backup of tosnap, incremental from fromsnap if it isn't NULL.
* If 'doall', dump all intermediate snaps.
* If 'replicate', dump special header and do recursively.
*/
int
zfs_send(zfs_handle_t *zhp, const char *fromsnap, const char *tosnap,
boolean_t replicate, boolean_t doall, boolean_t fromorigin,
boolean_t verbose, int outfd)
{
char errbuf[1024];
send_dump_data_t sdd = { 0 };
int err;
nvlist_t *fss = NULL;
avl_tree_t *fsavl = NULL;
(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 (replicate || doall) {
dmu_replay_record_t drr = { 0 };
char *packbuf = NULL;
size_t buflen = 0;
zio_cksum_t zc = { 0 };
assert(fromsnap || doall);
if (replicate) {
nvlist_t *hdrnv;
VERIFY(0 == nvlist_alloc(&hdrnv, NV_UNIQUE_NAME, 0));
if (fromsnap) {
VERIFY(0 == nvlist_add_string(hdrnv,
"fromsnap", fromsnap));
}
VERIFY(0 == nvlist_add_string(hdrnv, "tosnap", tosnap));
err = gather_nvlist(zhp->zfs_hdl, zhp->zfs_name,
fromsnap, tosnap, &fss, &fsavl);
if (err)
return (err);
VERIFY(0 == nvlist_add_nvlist(hdrnv, "fss", fss));
err = nvlist_pack(hdrnv, &packbuf, &buflen,
NV_ENCODE_XDR, 0);
nvlist_free(hdrnv);
if (err) {
fsavl_destroy(fsavl);
nvlist_free(fss);
return (zfs_standard_error(zhp->zfs_hdl,
err, errbuf));
}
}
/* write first begin record */
drr.drr_type = DRR_BEGIN;
drr.drr_u.drr_begin.drr_magic = DMU_BACKUP_MAGIC;
drr.drr_u.drr_begin.drr_version = DMU_BACKUP_HEADER_VERSION;
(void) snprintf(drr.drr_u.drr_begin.drr_toname,
sizeof (drr.drr_u.drr_begin.drr_toname),
"%s@%s", zhp->zfs_name, tosnap);
drr.drr_payloadlen = buflen;
fletcher_4_incremental_native(&drr, sizeof (drr), &zc);
err = write(outfd, &drr, sizeof (drr));
/* write header nvlist */
if (err != -1) {
fletcher_4_incremental_native(packbuf, buflen, &zc);
err = write(outfd, packbuf, buflen);
}
free(packbuf);
if (err == -1) {
fsavl_destroy(fsavl);
nvlist_free(fss);
return (zfs_standard_error(zhp->zfs_hdl,
errno, errbuf));
}
/* write end record */
if (err != -1) {
bzero(&drr, sizeof (drr));
drr.drr_type = DRR_END;
drr.drr_u.drr_end.drr_checksum = zc;
err = write(outfd, &drr, sizeof (drr));
if (err == -1) {
fsavl_destroy(fsavl);
nvlist_free(fss);
return (zfs_standard_error(zhp->zfs_hdl,
errno, errbuf));
}
}
}
/* dump each stream */
sdd.fromsnap = fromsnap;
sdd.tosnap = tosnap;
sdd.outfd = outfd;
sdd.replicate = replicate;
sdd.doall = doall;
sdd.fromorigin = fromorigin;
sdd.fss = fss;
sdd.fsavl = fsavl;
sdd.verbose = verbose;
err = dump_filesystems(zhp, &sdd);
fsavl_destroy(fsavl);
nvlist_free(fss);
if (replicate || doall) {
/*
* write final end record. NB: want to do this even if
* there was some error, because it might not be totally
* failed.
*/
dmu_replay_record_t drr = { 0 };
drr.drr_type = DRR_END;
if (write(outfd, &drr, sizeof (drr)) == -1) {
return (zfs_standard_error(zhp->zfs_hdl,
errno, errbuf));
}
}
return (err || sdd.err);
}
/*
* 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);
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);
}
static int
recv_rename(libzfs_handle_t *hdl, const char *name, const char *tryname,
int baselen, char *newname, recvflags_t flags)
{
static int seq;
zfs_cmd_t zc = { 0 };
int err;
prop_changelist_t *clp = NULL;
if (strchr(name, '@') == NULL) {
zfs_handle_t *zhp = zfs_open(hdl, name,
ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME);
if (zhp == NULL)
return (-1);
clp = changelist_gather(zhp, ZFS_PROP_NAME,
flags.force ? MS_FORCE : 0);
zfs_close(zhp);
if (clp == NULL)
return (-1);
err = changelist_prefix(clp);
if (err)
return (err);
}
if (tryname) {
(void) strcpy(newname, tryname);
zc.zc_objset_type = DMU_OST_ZFS;
(void) strlcpy(zc.zc_name, name, sizeof (zc.zc_name));
(void) strlcpy(zc.zc_value, tryname, sizeof (zc.zc_value));
if (flags.verbose) {
(void) printf("attempting rename %s to %s\n",
zc.zc_name, zc.zc_value);
}
err = ioctl(hdl->libzfs_fd, ZFS_IOC_RENAME, &zc);
if (err == 0 && clp)
changelist_rename(clp, name, tryname);
} else {
err = ENOENT;
}
if (err != 0 && strncmp(name+baselen, "recv-", 5) != 0) {
seq++;
(void) strncpy(newname, name, baselen);
(void) snprintf(newname+baselen, ZFS_MAXNAMELEN-baselen,
"recv-%u-%u", getpid(), seq);
(void) strlcpy(zc.zc_value, newname, sizeof (zc.zc_value));
if (flags.verbose) {
(void) printf("failed - trying rename %s to %s\n",
zc.zc_name, zc.zc_value);
}
err = ioctl(hdl->libzfs_fd, ZFS_IOC_RENAME, &zc);
if (err == 0 && clp)
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);
}
if (clp) {
(void) changelist_postfix(clp);
changelist_free(clp);
}
return (err);
}
static int
recv_destroy(libzfs_handle_t *hdl, const char *name, int baselen,
char *newname, recvflags_t flags)
{
zfs_cmd_t zc = { 0 };
int err;
zfs_handle_t *zhp = NULL;
zc.zc_objset_type = DMU_OST_ZFS;
(void) strlcpy(zc.zc_name, name, sizeof (zc.zc_name));
/* unmount it */
if (strchr(name, '@') == NULL) {
zhp = zfs_open(hdl, name,
ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME);
if (zhp == NULL)
return (-1);
err = zfs_unmount(zhp, NULL, flags.force ? MS_FORCE : 0);
if (err) {
zfs_close(zhp);
return (err);
}
}
if (flags.verbose)
(void) printf("attempting destroy %s\n", zc.zc_name);
err = ioctl(hdl->libzfs_fd, ZFS_IOC_DESTROY, &zc);
if (err != 0) {
(void) zfs_mount(zhp, NULL, 0);
err = recv_rename(hdl, name, NULL, baselen, newname, flags);
}
if (zhp)
zfs_close(zhp);
if (flags.verbose) {
if (err == 0)
(void) printf("success\n");
else
(void) printf("failed (%u)\n", errno);
}
return (err);
}
typedef struct guid_to_name_data {
uint64_t guid;
char *name;
} guid_to_name_data_t;
static int
guid_to_name_cb(zfs_handle_t *zhp, void *arg)
{
guid_to_name_data_t *gtnd = arg;
int err;
if (zhp->zfs_dmustats.dds_guid == gtnd->guid) {
(void) strcpy(gtnd->name, zhp->zfs_name);
return (EEXIST);
}
err = zfs_iter_children(zhp, guid_to_name_cb, gtnd);
zfs_close(zhp);
return (err);
}
static int
guid_to_name(libzfs_handle_t *hdl, const char *parent, uint64_t guid,
char *name)
{
/* exhaustive search all local snapshots */
guid_to_name_data_t gtnd;
int err = 0;
zfs_handle_t *zhp;
char *cp;
gtnd.guid = guid;
gtnd.name = name;
if (strchr(parent, '@') == NULL) {
zhp = make_dataset_handle(hdl, parent);
if (zhp != NULL) {
err = zfs_iter_children(zhp, guid_to_name_cb, &gtnd);
zfs_close(zhp);
if (err == EEXIST)
return (0);
}
}
cp = strchr(parent, '/');
if (cp)
*cp = '\0';
zhp = make_dataset_handle(hdl, parent);
if (cp)
*cp = '/';
if (zhp) {
err = zfs_iter_children(zhp, guid_to_name_cb, &gtnd);
zfs_close(zhp);
}
return (err == EEXIST ? 0 : ENOENT);
}
/*
* Return true if dataset guid1 is created before guid2.
*/
static boolean_t
created_before(libzfs_handle_t *hdl, avl_tree_t *avl,
uint64_t guid1, uint64_t guid2)
{
nvlist_t *nvfs;
char *fsname, *snapname;
char buf[ZFS_MAXNAMELEN];
boolean_t rv;
zfs_node_t zn1, zn2;
if (guid2 == 0)
return (B_FALSE);
if (guid1 == 0)
return (B_TRUE);
nvfs = fsavl_find(avl, guid1, &snapname);
VERIFY(0 == nvlist_lookup_string(nvfs, "name", &fsname));
(void) snprintf(buf, sizeof (buf), "%s@%s", fsname, snapname);
zn1.zn_handle = zfs_open(hdl, buf, ZFS_TYPE_SNAPSHOT);
nvfs = fsavl_find(avl, guid2, &snapname);
VERIFY(0 == nvlist_lookup_string(nvfs, "name", &fsname));
(void) snprintf(buf, sizeof (buf), "%s@%s", fsname, snapname);
zn2.zn_handle = zfs_open(hdl, buf, ZFS_TYPE_SNAPSHOT);
rv = (zfs_snapshot_compare(&zn1, &zn2) == -1);
zfs_close(zn1.zn_handle);
zfs_close(zn2.zn_handle);
return (rv);
}
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 *local_nv;
avl_tree_t *local_avl;
nvpair_t *fselem, *nextfselem;
char *tosnap, *fromsnap;
char newname[ZFS_MAXNAMELEN];
int error;
boolean_t needagain, progress;
VERIFY(0 == nvlist_lookup_string(stream_nv, "fromsnap", &fromsnap));
VERIFY(0 == nvlist_lookup_string(stream_nv, "tosnap", &tosnap));
if (flags.dryrun)
return (0);
again:
needagain = progress = B_FALSE;
if ((error = gather_nvlist(hdl, tofs, fromsnap, NULL,
&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) {
if (created_before(hdl, local_avl, stream_originguid,
originguid)) {
/* promote it! */
zfs_cmd_t zc = { 0 };
nvlist_t *origin_nvfs;
char *origin_fsname;
if (flags.verbose)
(void) printf("promoting %s\n", fsname);
origin_nvfs = fsavl_find(local_avl, originguid,
NULL);
VERIFY(0 == nvlist_lookup_string(origin_nvfs,
"name", &origin_fsname));
(void) strlcpy(zc.zc_value, origin_fsname,
sizeof (zc.zc_value));
(void) strlcpy(zc.zc_name, fsname,
sizeof (zc.zc_name));
error = zfs_ioctl(hdl, ZFS_IOC_PROMOTE, &zc);
if (error == 0)
progress = B_TRUE;
}
/*
* 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;
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_MAXNAMELEN];
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;
continue;
}
stream_nvfs = found;
/* check for different snapname */
if (strcmp(nvpair_name(snapelem),
stream_snapname) != 0) {
char name[ZFS_MAXNAMELEN];
char tryname[ZFS_MAXNAMELEN];
(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;
continue;
}
if (fromguid == 0 && 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));
/* check for rename */
if ((stream_parent_fromsnap_guid != 0 &&
stream_parent_fromsnap_guid != parent_fromsnap_guid) ||
strcmp(strrchr(fsname, '/'),
strrchr(stream_fsname, '/')) != 0) {
nvlist_t *parent;
char tryname[ZFS_MAXNAMELEN];
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);
}
}
error = recv_rename(hdl, fsname, tryname,
strlen(tofs)+1, newname, flags);
if (error)
needagain = B_TRUE;
else
progress = B_TRUE;
}
}
fsavl_destroy(local_avl);
nvlist_free(local_nv);
if (needagain && progress) {
/* do another pass to fix up temporary names */
if (flags.verbose)
(void) printf("another pass:\n");
goto again;
}
return (needagain);
}
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)
{
nvlist_t *stream_nv = NULL;
avl_tree_t *stream_avl = NULL;
char *fromsnap = NULL;
char tofs[ZFS_MAXNAMELEN];
char errbuf[1024];
dmu_replay_record_t drre;
int error;
boolean_t anyerr = B_FALSE;
(void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
"cannot receive"));
if (strchr(destname, '@')) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"can not specify snapshot name for multi-snapshot stream"));
return (zfs_error(hdl, EZFS_BADSTREAM, errbuf));
}
assert(drr->drr_type == DRR_BEGIN);
assert(drr->drr_u.drr_begin.drr_magic == DMU_BACKUP_MAGIC);
assert(drr->drr_u.drr_begin.drr_version == DMU_BACKUP_HEADER_VERSION);
/*
* Read in the nvlist from the stream.
*/
if (drr->drr_payloadlen != 0) {
if (!flags.isprefix) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"must use -d to receive replication "
"(send -R) stream"));
return (zfs_error(hdl, EZFS_BADSTREAM, errbuf));
}
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;
}
}
/*
* 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));
stream_avl = fsavl_create(stream_fss);
if (fromsnap != NULL) {
(void) strlcpy(tofs, destname, ZFS_MAXNAMELEN);
if (flags.isprefix) {
int i = strcspn(drr->drr_u.drr_begin.drr_toname,
"/@");
/* zfs_receive_one() will create_parents() */
(void) strlcat(tofs,
&drr->drr_u.drr_begin.drr_toname[i],
ZFS_MAXNAMELEN);
*strchr(tofs, '@') = '\0';
}
anyerr |= recv_incremental_replication(hdl, tofs,
flags, stream_nv, stream_avl);
}
}
/* 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(hdl, destname, flags, fd, stream_avl);
if (error == ENODATA) {
error = 0;
break;
}
anyerr |= error;
} while (error == 0);
if (drr->drr_payloadlen != 0 && fromsnap != NULL) {
/*
* Now that we have the fs's they sent us, try the
* renames again.
*/
anyerr |= recv_incremental_replication(hdl, tofs, flags,
stream_nv, stream_avl);
}
out:
fsavl_destroy(stream_avl);
if (stream_nv)
nvlist_free(stream_nv);
if (anyerr)
error = -1;
return (error);
}
static int
recv_skip(libzfs_handle_t *hdl, int fd, boolean_t byteswap)
{
dmu_replay_record_t *drr;
void *buf = malloc(1<<20);
/* 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:
/* NB: not to be used on v2 stream packages */
assert(drr->drr_payloadlen == 0);
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);
}
(void) recv_read(hdl, fd, buf,
P2ROUNDUP(drr->drr_u.drr_object.drr_bonuslen, 8),
B_FALSE, NULL);
break;
case DRR_WRITE:
if (byteswap) {
drr->drr_u.drr_write.drr_length =
BSWAP_32(drr->drr_u.drr_write.drr_length);
}
(void) recv_read(hdl, fd, buf,
drr->drr_u.drr_write.drr_length, B_FALSE, NULL);
break;
case DRR_FREEOBJECTS:
case DRR_FREE:
break;
default:
assert(!"invalid record type");
}
}
free(buf);
return (-1);
}
/*
* 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,
recvflags_t flags, dmu_replay_record_t *drr,
dmu_replay_record_t *drr_noswap, avl_tree_t *stream_avl)
{
zfs_cmd_t zc = { 0 };
time_t begin_time;
int ioctl_err, ioctl_errno, err, choplen;
char *cp;
struct drr_begin *drrb = &drr->drr_u.drr_begin;
char errbuf[1024];
char chopprefix[ZFS_MAXNAMELEN];
boolean_t newfs = B_FALSE;
boolean_t stream_wantsnewfs;
uint64_t parent_snapguid = 0;
prop_changelist_t *clp = NULL;
begin_time = time(NULL);
(void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
"cannot receive"));
if (stream_avl != NULL) {
nvlist_t *fs = fsavl_find(stream_avl, drrb->drr_toguid, NULL);
nvlist_t *props;
(void) nvlist_lookup_uint64(fs, "parentfromsnap",
&parent_snapguid);
err = nvlist_lookup_nvlist(fs, "props", &props);
if (err)
VERIFY(0 == nvlist_alloc(&props, NV_UNIQUE_NAME, 0));
if (flags.canmountoff) {
VERIFY(0 == nvlist_add_uint64(props,
zfs_prop_to_name(ZFS_PROP_CANMOUNT), 0));
}
if (zcmd_write_src_nvlist(hdl, &zc, props) != 0)
return (-1);
if (err)
nvlist_free(props);
}
/*
* 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.
*/
(void) strcpy(chopprefix, drrb->drr_toname);
if (flags.isprefix) {
/*
* They specified a fs with -d, we want to tack on
* everything but the pool name stored in the stream
*/
if (strchr(tosnap, '@')) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "invalid "
"argument - snapshot not allowed with -d"));
return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf));
}
cp = strchr(chopprefix, '/');
if (cp == NULL)
cp = strchr(chopprefix, '@');
*cp = '\0';
} else if (strchr(tosnap, '@') == NULL) {
/*
* If they specified a filesystem without -d, we want to
* tack on everything after the fs specified in the
* first name from the stream.
*/
cp = strchr(chopprefix, '@');
*cp = '\0';
}
choplen = strlen(chopprefix);
/*
* Determine name of destination snapshot, store in zc_value.
*/
(void) strcpy(zc.zc_value, tosnap);
(void) strncat(zc.zc_value, drrb->drr_toname+choplen,
sizeof (zc.zc_value));
if (!zfs_name_valid(zc.zc_value, ZFS_TYPE_SNAPSHOT))
return (zfs_error(hdl, EZFS_INVALIDNAME, errbuf));
/*
* Determine the name of the origin snapshot, store in zc_string.
*/
if (drrb->drr_flags & DRR_FLAG_CLONE) {
if (guid_to_name(hdl, tosnap,
drrb->drr_fromguid, zc.zc_string) != 0) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"local origin for clone %s does not exist"),
zc.zc_value);
return (zfs_error(hdl, EZFS_NOENT, errbuf));
}
if (flags.verbose)
(void) printf("found clone origin %s\n", zc.zc_string);
}
stream_wantsnewfs = (drrb->drr_fromguid == NULL ||
(drrb->drr_flags & DRR_FLAG_CLONE));
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(zc.zc_name, zc.zc_value);
cp = strrchr(zc.zc_name, '/');
if (cp)
*cp = '\0';
if (cp &&
!zfs_dataset_exists(hdl, zc.zc_name, ZFS_TYPE_DATASET)) {
char suffix[ZFS_MAXNAMELEN];
(void) strcpy(suffix, strrchr(zc.zc_value, '/'));
if (guid_to_name(hdl, tosnap, parent_snapguid,
zc.zc_value) == 0) {
*strchr(zc.zc_value, '@') = '\0';
(void) strcat(zc.zc_value, suffix);
}
}
} else {
/*
* if the fs does not exist, look for it based on the
* fromsnap GUID
*/
(void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
"cannot receive incremental stream"));
(void) strcpy(zc.zc_name, zc.zc_value);
*strchr(zc.zc_name, '@') = '\0';
if (!zfs_dataset_exists(hdl, zc.zc_name, ZFS_TYPE_DATASET)) {
char snap[ZFS_MAXNAMELEN];
(void) strcpy(snap, strchr(zc.zc_value, '@'));
if (guid_to_name(hdl, tosnap, drrb->drr_fromguid,
zc.zc_value) == 0) {
*strchr(zc.zc_value, '@') = '\0';
(void) strcat(zc.zc_value, snap);
}
}
}
(void) strcpy(zc.zc_name, zc.zc_value);
*strchr(zc.zc_name, '@') = '\0';
if (zfs_dataset_exists(hdl, zc.zc_name, ZFS_TYPE_DATASET)) {
zfs_handle_t *zhp;
/*
* Destination fs exists. Therefore this should either
* be an incremental, or the stream specifies a new fs
* (full stream or clone) and they want us to blow it
* away (and have therefore specified -F and removed any
* snapshots).
*/
if (stream_wantsnewfs) {
if (!flags.force) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"destination '%s' exists\n"
"must specify -F to overwrite it"),
zc.zc_name);
return (zfs_error(hdl, EZFS_EXISTS, errbuf));
}
if (ioctl(hdl->libzfs_fd, 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);
return (zfs_error(hdl, EZFS_EXISTS, errbuf));
}
}
zhp = zfs_open(hdl, zc.zc_name,
ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME);
if (zhp == NULL)
return (-1);
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"),
zc.zc_name);
return (zfs_error(hdl, EZFS_EXISTS, errbuf));
}
if (!flags.dryrun && zhp->zfs_type == ZFS_TYPE_FILESYSTEM &&
stream_wantsnewfs) {
/* We can't do online recv in this case */
clp = changelist_gather(zhp, ZFS_PROP_NAME, 0);
if (clp == NULL)
return (-1);
if (changelist_prefix(clp) != 0) {
changelist_free(clp);
return (-1);
}
}
if (!flags.dryrun && zhp->zfs_type == ZFS_TYPE_VOLUME) {
if (zvol_remove_link(hdl, zhp->zfs_name) != 0) {
zfs_close(zhp);
return (-1);
}
}
zfs_close(zhp);
} else {
/*
* Destination FS does not exist. Therefore we better
* be creating a new filesystem (either from a full
* backup, or a clone)
*/
if (!stream_wantsnewfs) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"destination '%s' does not exist"), zc.zc_name);
return (zfs_error(hdl, EZFS_NOENT, errbuf));
}
/* Do the recvbackup ioctl to the fs's parent. */
*strrchr(zc.zc_name, '/') = '\0';
if (flags.isprefix && !flags.dryrun) {
err = create_parents(hdl, zc.zc_value, strlen(tosnap));
if (err != 0) {
return (zfs_error(hdl,
EZFS_BADRESTORE, errbuf));
}
}
newfs = B_TRUE;
}
zc.zc_begin_record = drr_noswap->drr_u.drr_begin;
zc.zc_cookie = infd;
zc.zc_guid = flags.force;
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, zc.zc_value);
(void) fflush(stdout);
}
if (flags.dryrun)
return (recv_skip(hdl, infd, flags.byteswap));
err = ioctl_err = zfs_ioctl(hdl, ZFS_IOC_RECV, &zc);
ioctl_errno = errno;
if (err && (ioctl_errno == ENOENT || ioctl_errno == ENODEV)) {
/*
* 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;
char *cp = strchr(zc.zc_value, '@');
/*
* 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, zc.zc_value, NULL, NULL,
&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", zc.zc_value);
}
ioctl_err = recv_skip(hdl, infd,
flags.byteswap);
}
}
*cp = '@';
}
if (ioctl_err != 0) {
switch (ioctl_errno) {
case ENODEV:
cp = strchr(zc.zc_value, '@');
*cp = '\0';
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"most recent snapshot of %s does not\n"
"match incremental source"), zc.zc_value);
(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"), zc.zc_name);
(void) zfs_error(hdl, EZFS_BADRESTORE, errbuf);
break;
case EEXIST:
cp = strchr(zc.zc_value, '@');
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"),
zc.zc_value);
*cp = '@';
break;
case EINVAL:
(void) zfs_error(hdl, EZFS_BADSTREAM, errbuf);
break;
case ECKSUM:
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"invalid stream (checksum mismatch)"));
(void) zfs_error(hdl, EZFS_BADSTREAM, errbuf);
break;
default:
(void) zfs_standard_error(hdl, ioctl_errno, errbuf);
}
}
/*
* Mount or recreate the /dev links for the target filesystem
* (if created, or if we tore them down to do an incremental
* restore), and the /dev links for the new snapshot (if
* created). Also mount any children of the target filesystem
* if we did an incremental receive.
*/
cp = strchr(zc.zc_value, '@');
if (cp && (ioctl_err == 0 || !newfs)) {
zfs_handle_t *h;
*cp = '\0';
h = zfs_open(hdl, zc.zc_value,
ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME);
*cp = '@';
if (h) {
if (h->zfs_type == ZFS_TYPE_VOLUME) {
err = zvol_create_link(hdl, h->zfs_name);
if (err == 0 && ioctl_err == 0)
err = zvol_create_link(hdl,
zc.zc_value);
} else if (newfs) {
err = zfs_mount(h, NULL, 0);
}
zfs_close(h);
}
}
if (clp) {
err |= changelist_postfix(clp);
changelist_free(clp);
}
if (err || ioctl_err)
return (-1);
if (flags.verbose) {
char buf1[64];
char buf2[64];
uint64_t bytes = zc.zc_cookie;
time_t delta = time(NULL) - begin_time;
if (delta == 0)
delta = 1;
zfs_nicenum(bytes, buf1, sizeof (buf1));
zfs_nicenum(bytes/delta, buf2, sizeof (buf1));
(void) printf("received %sB stream in %lu seconds (%sB/sec)\n",
buf1, delta, buf2);
}
return (0);
}
/*
* Restores a backup of tosnap from the file descriptor specified by infd.
*/
int
zfs_receive(libzfs_handle_t *hdl, const char *tosnap, recvflags_t flags,
int infd, avl_tree_t *stream_avl)
{
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 };
(void) snprintf(errbuf, sizeof (errbuf), dgettext(TEXT_DOMAIN,
"cannot receive"));
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));
}
/* 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_version = BSWAP_64(drrb->drr_version);
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));
}
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 (drrb->drr_version == DMU_BACKUP_STREAM_VERSION) {
return (zfs_receive_one(hdl, infd, tosnap, flags,
&drr, &drr_noswap, stream_avl));
} else if (drrb->drr_version == DMU_BACKUP_HEADER_VERSION) {
return (zfs_receive_package(hdl, infd, tosnap, flags,
&drr, &zcksum));
} else {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"stream is unsupported version %llu"),
drrb->drr_version);
return (zfs_error(hdl, EZFS_BADSTREAM, errbuf));
}
}