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mirror_zfs/module/zfs/dmu_send.c
Jerry Jelinek 788eb90c4c Illumos 3897 - zfs filesystem and snapshot limits 
3897 zfs filesystem and snapshot limits
Author: Jerry Jelinek <jerry.jelinek@joyent.com>
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Approved by: Christopher Siden <christopher.siden@delphix.com>

References:
  https://www.illumos.org/issues/3897
  https://github.com/illumos/illumos-gate/commit/a2afb61

Porting Notes:

dsl_dataset_snapshot_check(): reduce stack usage using kmem_alloc().

Ported-by: Chris Dunlop <chris@onthe.net.au>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2015-04-28 16:22:51 -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 by Delphix. All rights reserved.
* Copyright 2011 Nexenta Systems, Inc. All rights reserved.
* Copyright (c) 2014, Joyent, Inc. All rights reserved.
* Copyright (c) 2011, 2014 by Delphix. All rights reserved.
*/
#include <sys/dmu.h>
#include <sys/dmu_impl.h>
#include <sys/dmu_tx.h>
#include <sys/dbuf.h>
#include <sys/dnode.h>
#include <sys/zfs_context.h>
#include <sys/dmu_objset.h>
#include <sys/dmu_traverse.h>
#include <sys/dsl_dataset.h>
#include <sys/dsl_dir.h>
#include <sys/dsl_prop.h>
#include <sys/dsl_pool.h>
#include <sys/dsl_synctask.h>
#include <sys/spa_impl.h>
#include <sys/zfs_ioctl.h>
#include <sys/zap.h>
#include <sys/zio_checksum.h>
#include <sys/zfs_znode.h>
#include <zfs_fletcher.h>
#include <sys/avl.h>
#include <sys/ddt.h>
#include <sys/zfs_onexit.h>
#include <sys/dmu_send.h>
#include <sys/dsl_destroy.h>
#include <sys/blkptr.h>
#include <sys/dsl_bookmark.h>
#include <sys/zfeature.h>
/* Set this tunable to TRUE to replace corrupt data with 0x2f5baddb10c */
int zfs_send_corrupt_data = B_FALSE;
static char *dmu_recv_tag = "dmu_recv_tag";
static const char *recv_clone_name = "%recv";
typedef struct dump_bytes_io {
dmu_sendarg_t *dbi_dsp;
void *dbi_buf;
int dbi_len;
} dump_bytes_io_t;
static void
dump_bytes_strategy(void *arg)
{
dump_bytes_io_t *dbi = (dump_bytes_io_t *)arg;
dmu_sendarg_t *dsp = dbi->dbi_dsp;
dsl_dataset_t *ds = dsp->dsa_os->os_dsl_dataset;
ssize_t resid; /* have to get resid to get detailed errno */
ASSERT0(dbi->dbi_len % 8);
fletcher_4_incremental_native(dbi->dbi_buf, dbi->dbi_len, &dsp->dsa_zc);
dsp->dsa_err = vn_rdwr(UIO_WRITE, dsp->dsa_vp,
(caddr_t)dbi->dbi_buf, dbi->dbi_len,
0, UIO_SYSSPACE, FAPPEND, RLIM64_INFINITY, CRED(), &resid);
mutex_enter(&ds->ds_sendstream_lock);
*dsp->dsa_off += dbi->dbi_len;
mutex_exit(&ds->ds_sendstream_lock);
}
static int
dump_bytes(dmu_sendarg_t *dsp, void *buf, int len)
{
dump_bytes_io_t dbi;
dbi.dbi_dsp = dsp;
dbi.dbi_buf = buf;
dbi.dbi_len = len;
/*
* The vn_rdwr() call is performed in a taskq to ensure that there is
* always enough stack space to write safely to the target filesystem.
* The ZIO_TYPE_FREE threads are used because there can be a lot of
* them and they are used in vdev_file.c for a similar purpose.
*/
spa_taskq_dispatch_sync(dmu_objset_spa(dsp->dsa_os), ZIO_TYPE_FREE,
ZIO_TASKQ_ISSUE, dump_bytes_strategy, &dbi, TQ_SLEEP);
return (dsp->dsa_err);
}
static int
dump_free(dmu_sendarg_t *dsp, uint64_t object, uint64_t offset,
uint64_t length)
{
struct drr_free *drrf = &(dsp->dsa_drr->drr_u.drr_free);
/*
* When we receive a free record, dbuf_free_range() assumes
* that the receiving system doesn't have any dbufs in the range
* being freed. This is always true because there is a one-record
* constraint: we only send one WRITE record for any given
* object+offset. We know that the one-record constraint is
* true because we always send data in increasing order by
* object,offset.
*
* If the increasing-order constraint ever changes, we should find
* another way to assert that the one-record constraint is still
* satisfied.
*/
ASSERT(object > dsp->dsa_last_data_object ||
(object == dsp->dsa_last_data_object &&
offset > dsp->dsa_last_data_offset));
/*
* If we are doing a non-incremental send, then there can't
* be any data in the dataset we're receiving into. Therefore
* a free record would simply be a no-op. Save space by not
* sending it to begin with.
*/
if (!dsp->dsa_incremental)
return (0);
if (length != -1ULL && offset + length < offset)
length = -1ULL;
/*
* If there is a pending op, but it's not PENDING_FREE, push it out,
* since free block aggregation can only be done for blocks of the
* same type (i.e., DRR_FREE records can only be aggregated with
* other DRR_FREE records. DRR_FREEOBJECTS records can only be
* aggregated with other DRR_FREEOBJECTS records.
*/
if (dsp->dsa_pending_op != PENDING_NONE &&
dsp->dsa_pending_op != PENDING_FREE) {
if (dump_bytes(dsp, dsp->dsa_drr,
sizeof (dmu_replay_record_t)) != 0)
return (SET_ERROR(EINTR));
dsp->dsa_pending_op = PENDING_NONE;
}
if (dsp->dsa_pending_op == PENDING_FREE) {
/*
* There should never be a PENDING_FREE if length is -1
* (because dump_dnode is the only place where this
* function is called with a -1, and only after flushing
* any pending record).
*/
ASSERT(length != -1ULL);
/*
* Check to see whether this free block can be aggregated
* with pending one.
*/
if (drrf->drr_object == object && drrf->drr_offset +
drrf->drr_length == offset) {
drrf->drr_length += length;
return (0);
} else {
/* not a continuation. Push out pending record */
if (dump_bytes(dsp, dsp->dsa_drr,
sizeof (dmu_replay_record_t)) != 0)
return (SET_ERROR(EINTR));
dsp->dsa_pending_op = PENDING_NONE;
}
}
/* create a FREE record and make it pending */
bzero(dsp->dsa_drr, sizeof (dmu_replay_record_t));
dsp->dsa_drr->drr_type = DRR_FREE;
drrf->drr_object = object;
drrf->drr_offset = offset;
drrf->drr_length = length;
drrf->drr_toguid = dsp->dsa_toguid;
if (length == -1ULL) {
if (dump_bytes(dsp, dsp->dsa_drr,
sizeof (dmu_replay_record_t)) != 0)
return (SET_ERROR(EINTR));
} else {
dsp->dsa_pending_op = PENDING_FREE;
}
return (0);
}
static int
dump_write(dmu_sendarg_t *dsp, dmu_object_type_t type,
uint64_t object, uint64_t offset, int blksz, const blkptr_t *bp, void *data)
{
struct drr_write *drrw = &(dsp->dsa_drr->drr_u.drr_write);
/*
* We send data in increasing object, offset order.
* See comment in dump_free() for details.
*/
ASSERT(object > dsp->dsa_last_data_object ||
(object == dsp->dsa_last_data_object &&
offset > dsp->dsa_last_data_offset));
dsp->dsa_last_data_object = object;
dsp->dsa_last_data_offset = offset + blksz - 1;
/*
* If there is any kind of pending aggregation (currently either
* a grouping of free objects or free blocks), push it out to
* the stream, since aggregation can't be done across operations
* of different types.
*/
if (dsp->dsa_pending_op != PENDING_NONE) {
if (dump_bytes(dsp, dsp->dsa_drr,
sizeof (dmu_replay_record_t)) != 0)
return (SET_ERROR(EINTR));
dsp->dsa_pending_op = PENDING_NONE;
}
/* write a DATA record */
bzero(dsp->dsa_drr, sizeof (dmu_replay_record_t));
dsp->dsa_drr->drr_type = DRR_WRITE;
drrw->drr_object = object;
drrw->drr_type = type;
drrw->drr_offset = offset;
drrw->drr_length = blksz;
drrw->drr_toguid = dsp->dsa_toguid;
if (BP_IS_EMBEDDED(bp)) {
/*
* There's no pre-computed checksum of embedded BP's, so
* (like fletcher4-checkummed blocks) userland will have
* to compute a dedup-capable checksum itself.
*/
drrw->drr_checksumtype = ZIO_CHECKSUM_OFF;
} else {
drrw->drr_checksumtype = BP_GET_CHECKSUM(bp);
if (zio_checksum_table[drrw->drr_checksumtype].ci_dedup)
drrw->drr_checksumflags |= DRR_CHECKSUM_DEDUP;
DDK_SET_LSIZE(&drrw->drr_key, BP_GET_LSIZE(bp));
DDK_SET_PSIZE(&drrw->drr_key, BP_GET_PSIZE(bp));
DDK_SET_COMPRESS(&drrw->drr_key, BP_GET_COMPRESS(bp));
drrw->drr_key.ddk_cksum = bp->blk_cksum;
}
if (dump_bytes(dsp, dsp->dsa_drr, sizeof (dmu_replay_record_t)) != 0)
return (SET_ERROR(EINTR));
if (dump_bytes(dsp, data, blksz) != 0)
return (SET_ERROR(EINTR));
return (0);
}
static int
dump_write_embedded(dmu_sendarg_t *dsp, uint64_t object, uint64_t offset,
int blksz, const blkptr_t *bp)
{
char buf[BPE_PAYLOAD_SIZE];
struct drr_write_embedded *drrw =
&(dsp->dsa_drr->drr_u.drr_write_embedded);
if (dsp->dsa_pending_op != PENDING_NONE) {
if (dump_bytes(dsp, dsp->dsa_drr,
sizeof (dmu_replay_record_t)) != 0)
return (EINTR);
dsp->dsa_pending_op = PENDING_NONE;
}
ASSERT(BP_IS_EMBEDDED(bp));
bzero(dsp->dsa_drr, sizeof (dmu_replay_record_t));
dsp->dsa_drr->drr_type = DRR_WRITE_EMBEDDED;
drrw->drr_object = object;
drrw->drr_offset = offset;
drrw->drr_length = blksz;
drrw->drr_toguid = dsp->dsa_toguid;
drrw->drr_compression = BP_GET_COMPRESS(bp);
drrw->drr_etype = BPE_GET_ETYPE(bp);
drrw->drr_lsize = BPE_GET_LSIZE(bp);
drrw->drr_psize = BPE_GET_PSIZE(bp);
decode_embedded_bp_compressed(bp, buf);
if (dump_bytes(dsp, dsp->dsa_drr, sizeof (dmu_replay_record_t)) != 0)
return (EINTR);
if (dump_bytes(dsp, buf, P2ROUNDUP(drrw->drr_psize, 8)) != 0)
return (EINTR);
return (0);
}
static int
dump_spill(dmu_sendarg_t *dsp, uint64_t object, int blksz, void *data)
{
struct drr_spill *drrs = &(dsp->dsa_drr->drr_u.drr_spill);
if (dsp->dsa_pending_op != PENDING_NONE) {
if (dump_bytes(dsp, dsp->dsa_drr,
sizeof (dmu_replay_record_t)) != 0)
return (SET_ERROR(EINTR));
dsp->dsa_pending_op = PENDING_NONE;
}
/* write a SPILL record */
bzero(dsp->dsa_drr, sizeof (dmu_replay_record_t));
dsp->dsa_drr->drr_type = DRR_SPILL;
drrs->drr_object = object;
drrs->drr_length = blksz;
drrs->drr_toguid = dsp->dsa_toguid;
if (dump_bytes(dsp, dsp->dsa_drr, sizeof (dmu_replay_record_t)))
return (SET_ERROR(EINTR));
if (dump_bytes(dsp, data, blksz))
return (SET_ERROR(EINTR));
return (0);
}
static int
dump_freeobjects(dmu_sendarg_t *dsp, uint64_t firstobj, uint64_t numobjs)
{
struct drr_freeobjects *drrfo = &(dsp->dsa_drr->drr_u.drr_freeobjects);
/* See comment in dump_free(). */
if (!dsp->dsa_incremental)
return (0);
/*
* If there is a pending op, but it's not PENDING_FREEOBJECTS,
* push it out, since free block aggregation can only be done for
* blocks of the same type (i.e., DRR_FREE records can only be
* aggregated with other DRR_FREE records. DRR_FREEOBJECTS records
* can only be aggregated with other DRR_FREEOBJECTS records.
*/
if (dsp->dsa_pending_op != PENDING_NONE &&
dsp->dsa_pending_op != PENDING_FREEOBJECTS) {
if (dump_bytes(dsp, dsp->dsa_drr,
sizeof (dmu_replay_record_t)) != 0)
return (SET_ERROR(EINTR));
dsp->dsa_pending_op = PENDING_NONE;
}
if (dsp->dsa_pending_op == PENDING_FREEOBJECTS) {
/*
* See whether this free object array can be aggregated
* with pending one
*/
if (drrfo->drr_firstobj + drrfo->drr_numobjs == firstobj) {
drrfo->drr_numobjs += numobjs;
return (0);
} else {
/* can't be aggregated. Push out pending record */
if (dump_bytes(dsp, dsp->dsa_drr,
sizeof (dmu_replay_record_t)) != 0)
return (SET_ERROR(EINTR));
dsp->dsa_pending_op = PENDING_NONE;
}
}
/* write a FREEOBJECTS record */
bzero(dsp->dsa_drr, sizeof (dmu_replay_record_t));
dsp->dsa_drr->drr_type = DRR_FREEOBJECTS;
drrfo->drr_firstobj = firstobj;
drrfo->drr_numobjs = numobjs;
drrfo->drr_toguid = dsp->dsa_toguid;
dsp->dsa_pending_op = PENDING_FREEOBJECTS;
return (0);
}
static int
dump_dnode(dmu_sendarg_t *dsp, uint64_t object, dnode_phys_t *dnp)
{
struct drr_object *drro = &(dsp->dsa_drr->drr_u.drr_object);
if (dnp == NULL || dnp->dn_type == DMU_OT_NONE)
return (dump_freeobjects(dsp, object, 1));
if (dsp->dsa_pending_op != PENDING_NONE) {
if (dump_bytes(dsp, dsp->dsa_drr,
sizeof (dmu_replay_record_t)) != 0)
return (SET_ERROR(EINTR));
dsp->dsa_pending_op = PENDING_NONE;
}
/* write an OBJECT record */
bzero(dsp->dsa_drr, sizeof (dmu_replay_record_t));
dsp->dsa_drr->drr_type = DRR_OBJECT;
drro->drr_object = object;
drro->drr_type = dnp->dn_type;
drro->drr_bonustype = dnp->dn_bonustype;
drro->drr_blksz = dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT;
drro->drr_bonuslen = dnp->dn_bonuslen;
drro->drr_checksumtype = dnp->dn_checksum;
drro->drr_compress = dnp->dn_compress;
drro->drr_toguid = dsp->dsa_toguid;
if (dump_bytes(dsp, dsp->dsa_drr, sizeof (dmu_replay_record_t)) != 0)
return (SET_ERROR(EINTR));
if (dump_bytes(dsp, DN_BONUS(dnp), P2ROUNDUP(dnp->dn_bonuslen, 8)) != 0)
return (SET_ERROR(EINTR));
/* Free anything past the end of the file. */
if (dump_free(dsp, object, (dnp->dn_maxblkid + 1) *
(dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT), -1ULL) != 0)
return (SET_ERROR(EINTR));
if (dsp->dsa_err != 0)
return (SET_ERROR(EINTR));
return (0);
}
static boolean_t
backup_do_embed(dmu_sendarg_t *dsp, const blkptr_t *bp)
{
if (!BP_IS_EMBEDDED(bp))
return (B_FALSE);
/*
* Compression function must be legacy, or explicitly enabled.
*/
if ((BP_GET_COMPRESS(bp) >= ZIO_COMPRESS_LEGACY_FUNCTIONS &&
!(dsp->dsa_featureflags & DMU_BACKUP_FEATURE_EMBED_DATA_LZ4)))
return (B_FALSE);
/*
* Embed type must be explicitly enabled.
*/
switch (BPE_GET_ETYPE(bp)) {
case BP_EMBEDDED_TYPE_DATA:
if (dsp->dsa_featureflags & DMU_BACKUP_FEATURE_EMBED_DATA)
return (B_TRUE);
break;
default:
return (B_FALSE);
}
return (B_FALSE);
}
#define BP_SPAN(dnp, level) \
(((uint64_t)dnp->dn_datablkszsec) << (SPA_MINBLOCKSHIFT + \
(level) * (dnp->dn_indblkshift - SPA_BLKPTRSHIFT)))
/* ARGSUSED */
static int
backup_cb(spa_t *spa, zilog_t *zilog, const blkptr_t *bp,
const zbookmark_phys_t *zb, const dnode_phys_t *dnp, void *arg)
{
dmu_sendarg_t *dsp = arg;
dmu_object_type_t type = bp ? BP_GET_TYPE(bp) : DMU_OT_NONE;
int err = 0;
if (issig(JUSTLOOKING) && issig(FORREAL))
return (SET_ERROR(EINTR));
if (zb->zb_object != DMU_META_DNODE_OBJECT &&
DMU_OBJECT_IS_SPECIAL(zb->zb_object)) {
return (0);
} else if (zb->zb_level == ZB_ZIL_LEVEL) {
/*
* If we are sending a non-snapshot (which is allowed on
* read-only pools), it may have a ZIL, which must be ignored.
*/
return (0);
} else if (BP_IS_HOLE(bp) &&
zb->zb_object == DMU_META_DNODE_OBJECT) {
uint64_t span = BP_SPAN(dnp, zb->zb_level);
uint64_t dnobj = (zb->zb_blkid * span) >> DNODE_SHIFT;
err = dump_freeobjects(dsp, dnobj, span >> DNODE_SHIFT);
} else if (BP_IS_HOLE(bp)) {
uint64_t span = BP_SPAN(dnp, zb->zb_level);
err = dump_free(dsp, zb->zb_object, zb->zb_blkid * span, span);
} else if (zb->zb_level > 0 || type == DMU_OT_OBJSET) {
return (0);
} else if (type == DMU_OT_DNODE) {
dnode_phys_t *blk;
int i;
int blksz = BP_GET_LSIZE(bp);
uint32_t aflags = ARC_WAIT;
arc_buf_t *abuf;
if (arc_read(NULL, spa, bp, arc_getbuf_func, &abuf,
ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL,
&aflags, zb) != 0)
return (SET_ERROR(EIO));
blk = abuf->b_data;
for (i = 0; i < blksz >> DNODE_SHIFT; i++) {
uint64_t dnobj = (zb->zb_blkid <<
(DNODE_BLOCK_SHIFT - DNODE_SHIFT)) + i;
err = dump_dnode(dsp, dnobj, blk+i);
if (err != 0)
break;
}
(void) arc_buf_remove_ref(abuf, &abuf);
} else if (type == DMU_OT_SA) {
uint32_t aflags = ARC_WAIT;
arc_buf_t *abuf;
int blksz = BP_GET_LSIZE(bp);
if (arc_read(NULL, spa, bp, arc_getbuf_func, &abuf,
ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL,
&aflags, zb) != 0)
return (SET_ERROR(EIO));
err = dump_spill(dsp, zb->zb_object, blksz, abuf->b_data);
(void) arc_buf_remove_ref(abuf, &abuf);
} else if (backup_do_embed(dsp, bp)) {
/* it's an embedded level-0 block of a regular object */
int blksz = dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT;
err = dump_write_embedded(dsp, zb->zb_object,
zb->zb_blkid * blksz, blksz, bp);
} else { /* it's a level-0 block of a regular object */
uint32_t aflags = ARC_WAIT;
arc_buf_t *abuf;
int blksz = BP_GET_LSIZE(bp);
ASSERT3U(blksz, ==, dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT);
ASSERT0(zb->zb_level);
if (arc_read(NULL, spa, bp, arc_getbuf_func, &abuf,
ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL,
&aflags, zb) != 0) {
if (zfs_send_corrupt_data) {
uint64_t *ptr;
/* Send a block filled with 0x"zfs badd bloc" */
abuf = arc_buf_alloc(spa, blksz, &abuf,
ARC_BUFC_DATA);
for (ptr = abuf->b_data;
(char *)ptr < (char *)abuf->b_data + blksz;
ptr++)
*ptr = 0x2f5baddb10cULL;
} else {
return (SET_ERROR(EIO));
}
}
err = dump_write(dsp, type, zb->zb_object, zb->zb_blkid * blksz,
blksz, bp, abuf->b_data);
(void) arc_buf_remove_ref(abuf, &abuf);
}
ASSERT(err == 0 || err == EINTR);
return (err);
}
/*
* Releases dp using the specified tag.
*/
static int
dmu_send_impl(void *tag, dsl_pool_t *dp, dsl_dataset_t *ds,
zfs_bookmark_phys_t *fromzb, boolean_t is_clone, boolean_t embedok,
int outfd, vnode_t *vp, offset_t *off)
{
objset_t *os;
dmu_replay_record_t *drr;
dmu_sendarg_t *dsp;
int err;
uint64_t fromtxg = 0;
uint64_t featureflags = 0;
err = dmu_objset_from_ds(ds, &os);
if (err != 0) {
dsl_pool_rele(dp, tag);
return (err);
}
drr = kmem_zalloc(sizeof (dmu_replay_record_t), KM_SLEEP);
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_SUBSTREAM);
#ifdef _KERNEL
if (dmu_objset_type(os) == DMU_OST_ZFS) {
uint64_t version;
if (zfs_get_zplprop(os, ZFS_PROP_VERSION, &version) != 0) {
kmem_free(drr, sizeof (dmu_replay_record_t));
dsl_pool_rele(dp, tag);
return (SET_ERROR(EINVAL));
}
if (version >= ZPL_VERSION_SA) {
featureflags |= DMU_BACKUP_FEATURE_SA_SPILL;
}
}
#endif
if (embedok &&
spa_feature_is_active(dp->dp_spa, SPA_FEATURE_EMBEDDED_DATA)) {
featureflags |= DMU_BACKUP_FEATURE_EMBED_DATA;
if (spa_feature_is_active(dp->dp_spa, SPA_FEATURE_LZ4_COMPRESS))
featureflags |= DMU_BACKUP_FEATURE_EMBED_DATA_LZ4;
} else {
embedok = B_FALSE;
}
DMU_SET_FEATUREFLAGS(drr->drr_u.drr_begin.drr_versioninfo,
featureflags);
drr->drr_u.drr_begin.drr_creation_time =
ds->ds_phys->ds_creation_time;
drr->drr_u.drr_begin.drr_type = dmu_objset_type(os);
if (is_clone)
drr->drr_u.drr_begin.drr_flags |= DRR_FLAG_CLONE;
drr->drr_u.drr_begin.drr_toguid = ds->ds_phys->ds_guid;
if (ds->ds_phys->ds_flags & DS_FLAG_CI_DATASET)
drr->drr_u.drr_begin.drr_flags |= DRR_FLAG_CI_DATA;
if (fromzb != NULL) {
drr->drr_u.drr_begin.drr_fromguid = fromzb->zbm_guid;
fromtxg = fromzb->zbm_creation_txg;
}
dsl_dataset_name(ds, drr->drr_u.drr_begin.drr_toname);
if (!dsl_dataset_is_snapshot(ds)) {
(void) strlcat(drr->drr_u.drr_begin.drr_toname, "@--head--",
sizeof (drr->drr_u.drr_begin.drr_toname));
}
dsp = kmem_zalloc(sizeof (dmu_sendarg_t), KM_SLEEP);
dsp->dsa_drr = drr;
dsp->dsa_vp = vp;
dsp->dsa_outfd = outfd;
dsp->dsa_proc = curproc;
dsp->dsa_os = os;
dsp->dsa_off = off;
dsp->dsa_toguid = ds->ds_phys->ds_guid;
ZIO_SET_CHECKSUM(&dsp->dsa_zc, 0, 0, 0, 0);
dsp->dsa_pending_op = PENDING_NONE;
dsp->dsa_incremental = (fromzb != NULL);
dsp->dsa_featureflags = featureflags;
mutex_enter(&ds->ds_sendstream_lock);
list_insert_head(&ds->ds_sendstreams, dsp);
mutex_exit(&ds->ds_sendstream_lock);
dsl_dataset_long_hold(ds, FTAG);
dsl_pool_rele(dp, tag);
if (dump_bytes(dsp, drr, sizeof (dmu_replay_record_t)) != 0) {
err = dsp->dsa_err;
goto out;
}
err = traverse_dataset(ds, fromtxg, TRAVERSE_PRE | TRAVERSE_PREFETCH,
backup_cb, dsp);
if (dsp->dsa_pending_op != PENDING_NONE)
if (dump_bytes(dsp, drr, sizeof (dmu_replay_record_t)) != 0)
err = SET_ERROR(EINTR);
if (err != 0) {
if (err == EINTR && dsp->dsa_err != 0)
err = dsp->dsa_err;
goto out;
}
bzero(drr, sizeof (dmu_replay_record_t));
drr->drr_type = DRR_END;
drr->drr_u.drr_end.drr_checksum = dsp->dsa_zc;
drr->drr_u.drr_end.drr_toguid = dsp->dsa_toguid;
if (dump_bytes(dsp, drr, sizeof (dmu_replay_record_t)) != 0) {
err = dsp->dsa_err;
goto out;
}
out:
mutex_enter(&ds->ds_sendstream_lock);
list_remove(&ds->ds_sendstreams, dsp);
mutex_exit(&ds->ds_sendstream_lock);
kmem_free(drr, sizeof (dmu_replay_record_t));
kmem_free(dsp, sizeof (dmu_sendarg_t));
dsl_dataset_long_rele(ds, FTAG);
return (err);
}
int
dmu_send_obj(const char *pool, uint64_t tosnap, uint64_t fromsnap,
boolean_t embedok, int outfd, vnode_t *vp, offset_t *off)
{
dsl_pool_t *dp;
dsl_dataset_t *ds;
dsl_dataset_t *fromds = NULL;
int err;
err = dsl_pool_hold(pool, FTAG, &dp);
if (err != 0)
return (err);
err = dsl_dataset_hold_obj(dp, tosnap, FTAG, &ds);
if (err != 0) {
dsl_pool_rele(dp, FTAG);
return (err);
}
if (fromsnap != 0) {
zfs_bookmark_phys_t zb;
boolean_t is_clone;
err = dsl_dataset_hold_obj(dp, fromsnap, FTAG, &fromds);
if (err != 0) {
dsl_dataset_rele(ds, FTAG);
dsl_pool_rele(dp, FTAG);
return (err);
}
if (!dsl_dataset_is_before(ds, fromds, 0))
err = SET_ERROR(EXDEV);
zb.zbm_creation_time = fromds->ds_phys->ds_creation_time;
zb.zbm_creation_txg = fromds->ds_phys->ds_creation_txg;
zb.zbm_guid = fromds->ds_phys->ds_guid;
is_clone = (fromds->ds_dir != ds->ds_dir);
dsl_dataset_rele(fromds, FTAG);
err = dmu_send_impl(FTAG, dp, ds, &zb, is_clone, embedok,
outfd, vp, off);
} else {
err = dmu_send_impl(FTAG, dp, ds, NULL, B_FALSE, embedok,
outfd, vp, off);
}
dsl_dataset_rele(ds, FTAG);
return (err);
}
int
dmu_send(const char *tosnap, const char *fromsnap, boolean_t embedok,
int outfd, vnode_t *vp, offset_t *off)
{
dsl_pool_t *dp;
dsl_dataset_t *ds;
int err;
boolean_t owned = B_FALSE;
if (fromsnap != NULL && strpbrk(fromsnap, "@#") == NULL)
return (SET_ERROR(EINVAL));
err = dsl_pool_hold(tosnap, FTAG, &dp);
if (err != 0)
return (err);
if (strchr(tosnap, '@') == NULL && spa_writeable(dp->dp_spa)) {
/*
* We are sending a filesystem or volume. Ensure
* that it doesn't change by owning the dataset.
*/
err = dsl_dataset_own(dp, tosnap, FTAG, &ds);
owned = B_TRUE;
} else {
err = dsl_dataset_hold(dp, tosnap, FTAG, &ds);
}
if (err != 0) {
dsl_pool_rele(dp, FTAG);
return (err);
}
if (fromsnap != NULL) {
zfs_bookmark_phys_t zb;
boolean_t is_clone = B_FALSE;
int fsnamelen = strchr(tosnap, '@') - tosnap;
/*
* If the fromsnap is in a different filesystem, then
* mark the send stream as a clone.
*/
if (strncmp(tosnap, fromsnap, fsnamelen) != 0 ||
(fromsnap[fsnamelen] != '@' &&
fromsnap[fsnamelen] != '#')) {
is_clone = B_TRUE;
}
if (strchr(fromsnap, '@')) {
dsl_dataset_t *fromds;
err = dsl_dataset_hold(dp, fromsnap, FTAG, &fromds);
if (err == 0) {
if (!dsl_dataset_is_before(ds, fromds, 0))
err = SET_ERROR(EXDEV);
zb.zbm_creation_time =
fromds->ds_phys->ds_creation_time;
zb.zbm_creation_txg =
fromds->ds_phys->ds_creation_txg;
zb.zbm_guid = fromds->ds_phys->ds_guid;
is_clone = (ds->ds_dir != fromds->ds_dir);
dsl_dataset_rele(fromds, FTAG);
}
} else {
err = dsl_bookmark_lookup(dp, fromsnap, ds, &zb);
}
if (err != 0) {
dsl_dataset_rele(ds, FTAG);
dsl_pool_rele(dp, FTAG);
return (err);
}
err = dmu_send_impl(FTAG, dp, ds, &zb, is_clone, embedok,
outfd, vp, off);
} else {
err = dmu_send_impl(FTAG, dp, ds, NULL, B_FALSE, embedok,
outfd, vp, off);
}
if (owned)
dsl_dataset_disown(ds, FTAG);
else
dsl_dataset_rele(ds, FTAG);
return (err);
}
int
dmu_send_estimate(dsl_dataset_t *ds, dsl_dataset_t *fromds, uint64_t *sizep)
{
int err;
uint64_t size, recordsize;
ASSERTV(dsl_pool_t *dp = ds->ds_dir->dd_pool);
ASSERT(dsl_pool_config_held(dp));
/* tosnap must be a snapshot */
if (!dsl_dataset_is_snapshot(ds))
return (SET_ERROR(EINVAL));
/*
* fromsnap must be an earlier snapshot from the same fs as tosnap,
* or the origin's fs.
*/
if (fromds != NULL && !dsl_dataset_is_before(ds, fromds, 0))
return (SET_ERROR(EXDEV));
/* Get uncompressed size estimate of changed data. */
if (fromds == NULL) {
size = ds->ds_phys->ds_uncompressed_bytes;
} else {
uint64_t used, comp;
err = dsl_dataset_space_written(fromds, ds,
&used, &comp, &size);
if (err != 0)
return (err);
}
/*
* Assume that space (both on-disk and in-stream) is dominated by
* data. We will adjust for indirect blocks and the copies property,
* but ignore per-object space used (eg, dnodes and DRR_OBJECT records).
*/
/*
* Subtract out approximate space used by indirect blocks.
* Assume most space is used by data blocks (non-indirect, non-dnode).
* Assume all blocks are recordsize. Assume ditto blocks and
* internal fragmentation counter out compression.
*
* Therefore, space used by indirect blocks is sizeof(blkptr_t) per
* block, which we observe in practice.
*/
err = dsl_prop_get_int_ds(ds, "recordsize", &recordsize);
if (err != 0)
return (err);
size -= size / recordsize * sizeof (blkptr_t);
/* Add in the space for the record associated with each block. */
size += size / recordsize * sizeof (dmu_replay_record_t);
*sizep = size;
return (0);
}
typedef struct dmu_recv_begin_arg {
const char *drba_origin;
dmu_recv_cookie_t *drba_cookie;
cred_t *drba_cred;
uint64_t drba_snapobj;
} dmu_recv_begin_arg_t;
static int
recv_begin_check_existing_impl(dmu_recv_begin_arg_t *drba, dsl_dataset_t *ds,
uint64_t fromguid)
{
uint64_t val;
int error;
dsl_pool_t *dp = ds->ds_dir->dd_pool;
/* temporary clone name must not exist */
error = zap_lookup(dp->dp_meta_objset,
ds->ds_dir->dd_phys->dd_child_dir_zapobj, recv_clone_name,
8, 1, &val);
if (error != ENOENT)
return (error == 0 ? EBUSY : error);
/* new snapshot name must not exist */
error = zap_lookup(dp->dp_meta_objset,
ds->ds_phys->ds_snapnames_zapobj, drba->drba_cookie->drc_tosnap,
8, 1, &val);
if (error != ENOENT)
return (error == 0 ? EEXIST : error);
/*
* Check snapshot limit before receiving. We'll recheck again at the
* end, but might as well abort before receiving if we're already over
* the limit.
*
* Note that we do not check the file system limit with
* dsl_dir_fscount_check because the temporary %clones don't count
* against that limit.
*/
error = dsl_fs_ss_limit_check(ds->ds_dir, 1, ZFS_PROP_SNAPSHOT_LIMIT,
NULL, drba->drba_cred);
if (error != 0)
return (error);
if (fromguid != 0) {
dsl_dataset_t *snap;
uint64_t obj = ds->ds_phys->ds_prev_snap_obj;
/* Find snapshot in this dir that matches fromguid. */
while (obj != 0) {
error = dsl_dataset_hold_obj(dp, obj, FTAG,
&snap);
if (error != 0)
return (SET_ERROR(ENODEV));
if (snap->ds_dir != ds->ds_dir) {
dsl_dataset_rele(snap, FTAG);
return (SET_ERROR(ENODEV));
}
if (snap->ds_phys->ds_guid == fromguid)
break;
obj = snap->ds_phys->ds_prev_snap_obj;
dsl_dataset_rele(snap, FTAG);
}
if (obj == 0)
return (SET_ERROR(ENODEV));
if (drba->drba_cookie->drc_force) {
drba->drba_snapobj = obj;
} else {
/*
* If we are not forcing, there must be no
* changes since fromsnap.
*/
if (dsl_dataset_modified_since_snap(ds, snap)) {
dsl_dataset_rele(snap, FTAG);
return (SET_ERROR(ETXTBSY));
}
drba->drba_snapobj = ds->ds_prev->ds_object;
}
dsl_dataset_rele(snap, FTAG);
} else {
/* if full, most recent snapshot must be $ORIGIN */
if (ds->ds_phys->ds_prev_snap_txg >= TXG_INITIAL)
return (SET_ERROR(ENODEV));
drba->drba_snapobj = ds->ds_phys->ds_prev_snap_obj;
}
return (0);
}
static int
dmu_recv_begin_check(void *arg, dmu_tx_t *tx)
{
dmu_recv_begin_arg_t *drba = arg;
dsl_pool_t *dp = dmu_tx_pool(tx);
struct drr_begin *drrb = drba->drba_cookie->drc_drrb;
uint64_t fromguid = drrb->drr_fromguid;
int flags = drrb->drr_flags;
int error;
uint64_t featureflags = DMU_GET_FEATUREFLAGS(drrb->drr_versioninfo);
dsl_dataset_t *ds;
const char *tofs = drba->drba_cookie->drc_tofs;
/* already checked */
ASSERT3U(drrb->drr_magic, ==, DMU_BACKUP_MAGIC);
if (DMU_GET_STREAM_HDRTYPE(drrb->drr_versioninfo) ==
DMU_COMPOUNDSTREAM ||
drrb->drr_type >= DMU_OST_NUMTYPES ||
((flags & DRR_FLAG_CLONE) && drba->drba_origin == NULL))
return (SET_ERROR(EINVAL));
/* Verify pool version supports SA if SA_SPILL feature set */
if ((featureflags & DMU_BACKUP_FEATURE_SA_SPILL) &&
spa_version(dp->dp_spa) < SPA_VERSION_SA)
return (SET_ERROR(ENOTSUP));
/*
* The receiving code doesn't know how to translate a WRITE_EMBEDDED
* record to a plan WRITE record, so the pool must have the
* EMBEDDED_DATA feature enabled if the stream has WRITE_EMBEDDED
* records. Same with WRITE_EMBEDDED records that use LZ4 compression.
*/
if ((featureflags & DMU_BACKUP_FEATURE_EMBED_DATA) &&
!spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_EMBEDDED_DATA))
return (SET_ERROR(ENOTSUP));
if ((featureflags & DMU_BACKUP_FEATURE_EMBED_DATA_LZ4) &&
!spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_LZ4_COMPRESS))
return (SET_ERROR(ENOTSUP));
error = dsl_dataset_hold(dp, tofs, FTAG, &ds);
if (error == 0) {
/* target fs already exists; recv into temp clone */
/* Can't recv a clone into an existing fs */
if (flags & DRR_FLAG_CLONE) {
dsl_dataset_rele(ds, FTAG);
return (SET_ERROR(EINVAL));
}
error = recv_begin_check_existing_impl(drba, ds, fromguid);
dsl_dataset_rele(ds, FTAG);
} else if (error == ENOENT) {
/* target fs does not exist; must be a full backup or clone */
char buf[MAXNAMELEN];
/*
* If it's a non-clone incremental, we are missing the
* target fs, so fail the recv.
*/
if (fromguid != 0 && !(flags & DRR_FLAG_CLONE))
return (SET_ERROR(ENOENT));
/* Open the parent of tofs */
ASSERT3U(strlen(tofs), <, MAXNAMELEN);
(void) strlcpy(buf, tofs, strrchr(tofs, '/') - tofs + 1);
error = dsl_dataset_hold(dp, buf, FTAG, &ds);
if (error != 0)
return (error);
/*
* Check filesystem and snapshot limits before receiving. We'll
* recheck snapshot limits again at the end (we create the
* filesystems and increment those counts during begin_sync).
*/
error = dsl_fs_ss_limit_check(ds->ds_dir, 1,
ZFS_PROP_FILESYSTEM_LIMIT, NULL, drba->drba_cred);
if (error != 0) {
dsl_dataset_rele(ds, FTAG);
return (error);
}
error = dsl_fs_ss_limit_check(ds->ds_dir, 1,
ZFS_PROP_SNAPSHOT_LIMIT, NULL, drba->drba_cred);
if (error != 0) {
dsl_dataset_rele(ds, FTAG);
return (error);
}
if (drba->drba_origin != NULL) {
dsl_dataset_t *origin;
error = dsl_dataset_hold(dp, drba->drba_origin,
FTAG, &origin);
if (error != 0) {
dsl_dataset_rele(ds, FTAG);
return (error);
}
if (!dsl_dataset_is_snapshot(origin)) {
dsl_dataset_rele(origin, FTAG);
dsl_dataset_rele(ds, FTAG);
return (SET_ERROR(EINVAL));
}
if (origin->ds_phys->ds_guid != fromguid) {
dsl_dataset_rele(origin, FTAG);
dsl_dataset_rele(ds, FTAG);
return (SET_ERROR(ENODEV));
}
dsl_dataset_rele(origin, FTAG);
}
dsl_dataset_rele(ds, FTAG);
error = 0;
}
return (error);
}
static void
dmu_recv_begin_sync(void *arg, dmu_tx_t *tx)
{
dmu_recv_begin_arg_t *drba = arg;
dsl_pool_t *dp = dmu_tx_pool(tx);
struct drr_begin *drrb = drba->drba_cookie->drc_drrb;
const char *tofs = drba->drba_cookie->drc_tofs;
dsl_dataset_t *ds, *newds;
uint64_t dsobj;
int error;
uint64_t crflags;
crflags = (drrb->drr_flags & DRR_FLAG_CI_DATA) ?
DS_FLAG_CI_DATASET : 0;
error = dsl_dataset_hold(dp, tofs, FTAG, &ds);
if (error == 0) {
/* create temporary clone */
dsl_dataset_t *snap = NULL;
if (drba->drba_snapobj != 0) {
VERIFY0(dsl_dataset_hold_obj(dp,
drba->drba_snapobj, FTAG, &snap));
}
dsobj = dsl_dataset_create_sync(ds->ds_dir, recv_clone_name,
snap, crflags, drba->drba_cred, tx);
dsl_dataset_rele(snap, FTAG);
dsl_dataset_rele(ds, FTAG);
} else {
dsl_dir_t *dd;
const char *tail;
dsl_dataset_t *origin = NULL;
VERIFY0(dsl_dir_hold(dp, tofs, FTAG, &dd, &tail));
if (drba->drba_origin != NULL) {
VERIFY0(dsl_dataset_hold(dp, drba->drba_origin,
FTAG, &origin));
}
/* Create new dataset. */
dsobj = dsl_dataset_create_sync(dd,
strrchr(tofs, '/') + 1,
origin, crflags, drba->drba_cred, tx);
if (origin != NULL)
dsl_dataset_rele(origin, FTAG);
dsl_dir_rele(dd, FTAG);
drba->drba_cookie->drc_newfs = B_TRUE;
}
VERIFY0(dsl_dataset_own_obj(dp, dsobj, dmu_recv_tag, &newds));
dmu_buf_will_dirty(newds->ds_dbuf, tx);
newds->ds_phys->ds_flags |= DS_FLAG_INCONSISTENT;
/*
* If we actually created a non-clone, we need to create the
* objset in our new dataset.
*/
if (BP_IS_HOLE(dsl_dataset_get_blkptr(newds))) {
(void) dmu_objset_create_impl(dp->dp_spa,
newds, dsl_dataset_get_blkptr(newds), drrb->drr_type, tx);
}
drba->drba_cookie->drc_ds = newds;
spa_history_log_internal_ds(newds, "receive", tx, "");
}
/*
* NB: callers *MUST* call dmu_recv_stream() if dmu_recv_begin()
* succeeds; otherwise we will leak the holds on the datasets.
*/
int
dmu_recv_begin(char *tofs, char *tosnap, struct drr_begin *drrb,
boolean_t force, char *origin, dmu_recv_cookie_t *drc)
{
dmu_recv_begin_arg_t drba = { 0 };
dmu_replay_record_t *drr;
bzero(drc, sizeof (dmu_recv_cookie_t));
drc->drc_drrb = drrb;
drc->drc_tosnap = tosnap;
drc->drc_tofs = tofs;
drc->drc_force = force;
drc->drc_cred = CRED();
if (drrb->drr_magic == BSWAP_64(DMU_BACKUP_MAGIC))
drc->drc_byteswap = B_TRUE;
else if (drrb->drr_magic != DMU_BACKUP_MAGIC)
return (SET_ERROR(EINVAL));
drr = kmem_zalloc(sizeof (dmu_replay_record_t), KM_SLEEP);
drr->drr_type = DRR_BEGIN;
drr->drr_u.drr_begin = *drc->drc_drrb;
if (drc->drc_byteswap) {
fletcher_4_incremental_byteswap(drr,
sizeof (dmu_replay_record_t), &drc->drc_cksum);
} else {
fletcher_4_incremental_native(drr,
sizeof (dmu_replay_record_t), &drc->drc_cksum);
}
kmem_free(drr, sizeof (dmu_replay_record_t));
if (drc->drc_byteswap) {
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_toguid = BSWAP_64(drrb->drr_toguid);
drrb->drr_fromguid = BSWAP_64(drrb->drr_fromguid);
}
drba.drba_origin = origin;
drba.drba_cookie = drc;
drba.drba_cred = CRED();
return (dsl_sync_task(tofs, dmu_recv_begin_check, dmu_recv_begin_sync,
&drba, 5));
}
struct restorearg {
int err;
boolean_t byteswap;
vnode_t *vp;
char *buf;
uint64_t voff;
int bufsize; /* amount of memory allocated for buf */
zio_cksum_t cksum;
avl_tree_t *guid_to_ds_map;
};
typedef struct guid_map_entry {
uint64_t guid;
dsl_dataset_t *gme_ds;
avl_node_t avlnode;
} guid_map_entry_t;
static int
guid_compare(const void *arg1, const void *arg2)
{
const guid_map_entry_t *gmep1 = arg1;
const guid_map_entry_t *gmep2 = arg2;
if (gmep1->guid < gmep2->guid)
return (-1);
else if (gmep1->guid > gmep2->guid)
return (1);
return (0);
}
static void
free_guid_map_onexit(void *arg)
{
avl_tree_t *ca = arg;
void *cookie = NULL;
guid_map_entry_t *gmep;
while ((gmep = avl_destroy_nodes(ca, &cookie)) != NULL) {
dsl_dataset_long_rele(gmep->gme_ds, gmep);
dsl_dataset_rele(gmep->gme_ds, gmep);
kmem_free(gmep, sizeof (guid_map_entry_t));
}
avl_destroy(ca);
kmem_free(ca, sizeof (avl_tree_t));
}
static void *
restore_read(struct restorearg *ra, int len, char *buf)
{
int done = 0;
if (buf == NULL)
buf = ra->buf;
/* some things will require 8-byte alignment, so everything must */
ASSERT0(len % 8);
while (done < len) {
ssize_t resid;
ra->err = vn_rdwr(UIO_READ, ra->vp,
buf + done, len - done,
ra->voff, UIO_SYSSPACE, FAPPEND,
RLIM64_INFINITY, CRED(), &resid);
if (resid == len - done)
ra->err = SET_ERROR(EINVAL);
ra->voff += len - done - resid;
done = len - resid;
if (ra->err != 0)
return (NULL);
}
ASSERT3U(done, ==, len);
if (ra->byteswap)
fletcher_4_incremental_byteswap(buf, len, &ra->cksum);
else
fletcher_4_incremental_native(buf, len, &ra->cksum);
return (buf);
}
noinline static void
backup_byteswap(dmu_replay_record_t *drr)
{
#define DO64(X) (drr->drr_u.X = BSWAP_64(drr->drr_u.X))
#define DO32(X) (drr->drr_u.X = BSWAP_32(drr->drr_u.X))
drr->drr_type = BSWAP_32(drr->drr_type);
drr->drr_payloadlen = BSWAP_32(drr->drr_payloadlen);
switch (drr->drr_type) {
case DRR_BEGIN:
DO64(drr_begin.drr_magic);
DO64(drr_begin.drr_versioninfo);
DO64(drr_begin.drr_creation_time);
DO32(drr_begin.drr_type);
DO32(drr_begin.drr_flags);
DO64(drr_begin.drr_toguid);
DO64(drr_begin.drr_fromguid);
break;
case DRR_OBJECT:
DO64(drr_object.drr_object);
DO32(drr_object.drr_type);
DO32(drr_object.drr_bonustype);
DO32(drr_object.drr_blksz);
DO32(drr_object.drr_bonuslen);
DO64(drr_object.drr_toguid);
break;
case DRR_FREEOBJECTS:
DO64(drr_freeobjects.drr_firstobj);
DO64(drr_freeobjects.drr_numobjs);
DO64(drr_freeobjects.drr_toguid);
break;
case DRR_WRITE:
DO64(drr_write.drr_object);
DO32(drr_write.drr_type);
DO64(drr_write.drr_offset);
DO64(drr_write.drr_length);
DO64(drr_write.drr_toguid);
DO64(drr_write.drr_key.ddk_cksum.zc_word[0]);
DO64(drr_write.drr_key.ddk_cksum.zc_word[1]);
DO64(drr_write.drr_key.ddk_cksum.zc_word[2]);
DO64(drr_write.drr_key.ddk_cksum.zc_word[3]);
DO64(drr_write.drr_key.ddk_prop);
break;
case DRR_WRITE_BYREF:
DO64(drr_write_byref.drr_object);
DO64(drr_write_byref.drr_offset);
DO64(drr_write_byref.drr_length);
DO64(drr_write_byref.drr_toguid);
DO64(drr_write_byref.drr_refguid);
DO64(drr_write_byref.drr_refobject);
DO64(drr_write_byref.drr_refoffset);
DO64(drr_write_byref.drr_key.ddk_cksum.zc_word[0]);
DO64(drr_write_byref.drr_key.ddk_cksum.zc_word[1]);
DO64(drr_write_byref.drr_key.ddk_cksum.zc_word[2]);
DO64(drr_write_byref.drr_key.ddk_cksum.zc_word[3]);
DO64(drr_write_byref.drr_key.ddk_prop);
break;
case DRR_WRITE_EMBEDDED:
DO64(drr_write_embedded.drr_object);
DO64(drr_write_embedded.drr_offset);
DO64(drr_write_embedded.drr_length);
DO64(drr_write_embedded.drr_toguid);
DO32(drr_write_embedded.drr_lsize);
DO32(drr_write_embedded.drr_psize);
break;
case DRR_FREE:
DO64(drr_free.drr_object);
DO64(drr_free.drr_offset);
DO64(drr_free.drr_length);
DO64(drr_free.drr_toguid);
break;
case DRR_SPILL:
DO64(drr_spill.drr_object);
DO64(drr_spill.drr_length);
DO64(drr_spill.drr_toguid);
break;
case DRR_END:
DO64(drr_end.drr_checksum.zc_word[0]);
DO64(drr_end.drr_checksum.zc_word[1]);
DO64(drr_end.drr_checksum.zc_word[2]);
DO64(drr_end.drr_checksum.zc_word[3]);
DO64(drr_end.drr_toguid);
break;
default:
break;
}
#undef DO64
#undef DO32
}
static inline uint8_t
deduce_nblkptr(dmu_object_type_t bonus_type, uint64_t bonus_size)
{
if (bonus_type == DMU_OT_SA) {
return (1);
} else {
return (1 +
((DN_MAX_BONUSLEN - bonus_size) >> SPA_BLKPTRSHIFT));
}
}
noinline static int
restore_object(struct restorearg *ra, objset_t *os, struct drr_object *drro)
{
dmu_object_info_t doi;
dmu_tx_t *tx;
void *data = NULL;
uint64_t object;
int err;
if (drro->drr_type == DMU_OT_NONE ||
!DMU_OT_IS_VALID(drro->drr_type) ||
!DMU_OT_IS_VALID(drro->drr_bonustype) ||
drro->drr_checksumtype >= ZIO_CHECKSUM_FUNCTIONS ||
drro->drr_compress >= ZIO_COMPRESS_FUNCTIONS ||
P2PHASE(drro->drr_blksz, SPA_MINBLOCKSIZE) ||
drro->drr_blksz < SPA_MINBLOCKSIZE ||
drro->drr_blksz > SPA_MAXBLOCKSIZE ||
drro->drr_bonuslen > DN_MAX_BONUSLEN) {
return (SET_ERROR(EINVAL));
}
err = dmu_object_info(os, drro->drr_object, &doi);
if (err != 0 && err != ENOENT)
return (SET_ERROR(EINVAL));
object = err == 0 ? drro->drr_object : DMU_NEW_OBJECT;
if (drro->drr_bonuslen) {
data = restore_read(ra, P2ROUNDUP(drro->drr_bonuslen, 8), NULL);
if (ra->err != 0)
return (ra->err);
}
/*
* If we are losing blkptrs or changing the block size this must
* be a new file instance. We must clear out the previous file
* contents before we can change this type of metadata in the dnode.
*/
if (err == 0) {
int nblkptr;
nblkptr = deduce_nblkptr(drro->drr_bonustype,
drro->drr_bonuslen);
if (drro->drr_blksz != doi.doi_data_block_size ||
nblkptr < doi.doi_nblkptr) {
err = dmu_free_long_range(os, drro->drr_object,
0, DMU_OBJECT_END);
if (err != 0)
return (SET_ERROR(EINVAL));
}
}
tx = dmu_tx_create(os);
dmu_tx_hold_bonus(tx, object);
err = dmu_tx_assign(tx, TXG_WAIT);
if (err != 0) {
dmu_tx_abort(tx);
return (err);
}
if (object == DMU_NEW_OBJECT) {
/* currently free, want to be allocated */
err = dmu_object_claim(os, drro->drr_object,
drro->drr_type, drro->drr_blksz,
drro->drr_bonustype, drro->drr_bonuslen, tx);
} else if (drro->drr_type != doi.doi_type ||
drro->drr_blksz != doi.doi_data_block_size ||
drro->drr_bonustype != doi.doi_bonus_type ||
drro->drr_bonuslen != doi.doi_bonus_size) {
/* currently allocated, but with different properties */
err = dmu_object_reclaim(os, drro->drr_object,
drro->drr_type, drro->drr_blksz,
drro->drr_bonustype, drro->drr_bonuslen, tx);
}
if (err != 0) {
dmu_tx_commit(tx);
return (SET_ERROR(EINVAL));
}
dmu_object_set_checksum(os, drro->drr_object, drro->drr_checksumtype,
tx);
dmu_object_set_compress(os, drro->drr_object, drro->drr_compress, tx);
if (data != NULL) {
dmu_buf_t *db;
VERIFY(0 == dmu_bonus_hold(os, drro->drr_object, FTAG, &db));
dmu_buf_will_dirty(db, tx);
ASSERT3U(db->db_size, >=, drro->drr_bonuslen);
bcopy(data, db->db_data, drro->drr_bonuslen);
if (ra->byteswap) {
dmu_object_byteswap_t byteswap =
DMU_OT_BYTESWAP(drro->drr_bonustype);
dmu_ot_byteswap[byteswap].ob_func(db->db_data,
drro->drr_bonuslen);
}
dmu_buf_rele(db, FTAG);
}
dmu_tx_commit(tx);
return (0);
}
/* ARGSUSED */
noinline static int
restore_freeobjects(struct restorearg *ra, objset_t *os,
struct drr_freeobjects *drrfo)
{
uint64_t obj;
if (drrfo->drr_firstobj + drrfo->drr_numobjs < drrfo->drr_firstobj)
return (SET_ERROR(EINVAL));
for (obj = drrfo->drr_firstobj;
obj < drrfo->drr_firstobj + drrfo->drr_numobjs;
(void) dmu_object_next(os, &obj, FALSE, 0)) {
int err;
if (dmu_object_info(os, obj, NULL) != 0)
continue;
err = dmu_free_long_object(os, obj);
if (err != 0)
return (err);
}
return (0);
}
noinline static int
restore_write(struct restorearg *ra, objset_t *os,
struct drr_write *drrw)
{
dmu_tx_t *tx;
dmu_buf_t *bonus;
arc_buf_t *abuf;
void *data;
int err;
if (drrw->drr_offset + drrw->drr_length < drrw->drr_offset ||
!DMU_OT_IS_VALID(drrw->drr_type))
return (SET_ERROR(EINVAL));
if (dmu_object_info(os, drrw->drr_object, NULL) != 0)
return (SET_ERROR(EINVAL));
if (dmu_bonus_hold(os, drrw->drr_object, FTAG, &bonus) != 0)
return (SET_ERROR(EINVAL));
abuf = dmu_request_arcbuf(bonus, drrw->drr_length);
data = restore_read(ra, drrw->drr_length, abuf->b_data);
if (data == NULL) {
dmu_return_arcbuf(abuf);
dmu_buf_rele(bonus, FTAG);
return (ra->err);
}
tx = dmu_tx_create(os);
dmu_tx_hold_write(tx, drrw->drr_object,
drrw->drr_offset, drrw->drr_length);
err = dmu_tx_assign(tx, TXG_WAIT);
if (err != 0) {
dmu_return_arcbuf(abuf);
dmu_buf_rele(bonus, FTAG);
dmu_tx_abort(tx);
return (err);
}
if (ra->byteswap) {
dmu_object_byteswap_t byteswap =
DMU_OT_BYTESWAP(drrw->drr_type);
dmu_ot_byteswap[byteswap].ob_func(data, drrw->drr_length);
}
dmu_assign_arcbuf(bonus, drrw->drr_offset, abuf, tx);
dmu_tx_commit(tx);
dmu_buf_rele(bonus, FTAG);
return (0);
}
/*
* Handle a DRR_WRITE_BYREF record. This record is used in dedup'ed
* streams to refer to a copy of the data that is already on the
* system because it came in earlier in the stream. This function
* finds the earlier copy of the data, and uses that copy instead of
* data from the stream to fulfill this write.
*/
static int
restore_write_byref(struct restorearg *ra, objset_t *os,
struct drr_write_byref *drrwbr)
{
dmu_tx_t *tx;
int err;
guid_map_entry_t gmesrch;
guid_map_entry_t *gmep;
avl_index_t where;
objset_t *ref_os = NULL;
dmu_buf_t *dbp;
if (drrwbr->drr_offset + drrwbr->drr_length < drrwbr->drr_offset)
return (SET_ERROR(EINVAL));
/*
* If the GUID of the referenced dataset is different from the
* GUID of the target dataset, find the referenced dataset.
*/
if (drrwbr->drr_toguid != drrwbr->drr_refguid) {
gmesrch.guid = drrwbr->drr_refguid;
if ((gmep = avl_find(ra->guid_to_ds_map, &gmesrch,
&where)) == NULL) {
return (SET_ERROR(EINVAL));
}
if (dmu_objset_from_ds(gmep->gme_ds, &ref_os))
return (SET_ERROR(EINVAL));
} else {
ref_os = os;
}
err = dmu_buf_hold(ref_os, drrwbr->drr_refobject,
drrwbr->drr_refoffset, FTAG, &dbp, DMU_READ_PREFETCH);
if (err != 0)
return (err);
tx = dmu_tx_create(os);
dmu_tx_hold_write(tx, drrwbr->drr_object,
drrwbr->drr_offset, drrwbr->drr_length);
err = dmu_tx_assign(tx, TXG_WAIT);
if (err != 0) {
dmu_tx_abort(tx);
return (err);
}
dmu_write(os, drrwbr->drr_object,
drrwbr->drr_offset, drrwbr->drr_length, dbp->db_data, tx);
dmu_buf_rele(dbp, FTAG);
dmu_tx_commit(tx);
return (0);
}
static int
restore_write_embedded(struct restorearg *ra, objset_t *os,
struct drr_write_embedded *drrwnp)
{
dmu_tx_t *tx;
int err;
void *data;
if (drrwnp->drr_offset + drrwnp->drr_length < drrwnp->drr_offset)
return (EINVAL);
if (drrwnp->drr_psize > BPE_PAYLOAD_SIZE)
return (EINVAL);
if (drrwnp->drr_etype >= NUM_BP_EMBEDDED_TYPES)
return (EINVAL);
if (drrwnp->drr_compression >= ZIO_COMPRESS_FUNCTIONS)
return (EINVAL);
data = restore_read(ra, P2ROUNDUP(drrwnp->drr_psize, 8), NULL);
if (data == NULL)
return (ra->err);
tx = dmu_tx_create(os);
dmu_tx_hold_write(tx, drrwnp->drr_object,
drrwnp->drr_offset, drrwnp->drr_length);
err = dmu_tx_assign(tx, TXG_WAIT);
if (err != 0) {
dmu_tx_abort(tx);
return (err);
}
dmu_write_embedded(os, drrwnp->drr_object,
drrwnp->drr_offset, data, drrwnp->drr_etype,
drrwnp->drr_compression, drrwnp->drr_lsize, drrwnp->drr_psize,
ra->byteswap ^ ZFS_HOST_BYTEORDER, tx);
dmu_tx_commit(tx);
return (0);
}
static int
restore_spill(struct restorearg *ra, objset_t *os, struct drr_spill *drrs)
{
dmu_tx_t *tx;
void *data;
dmu_buf_t *db, *db_spill;
int err;
if (drrs->drr_length < SPA_MINBLOCKSIZE ||
drrs->drr_length > SPA_MAXBLOCKSIZE)
return (SET_ERROR(EINVAL));
data = restore_read(ra, drrs->drr_length, NULL);
if (data == NULL)
return (ra->err);
if (dmu_object_info(os, drrs->drr_object, NULL) != 0)
return (SET_ERROR(EINVAL));
VERIFY(0 == dmu_bonus_hold(os, drrs->drr_object, FTAG, &db));
if ((err = dmu_spill_hold_by_bonus(db, FTAG, &db_spill)) != 0) {
dmu_buf_rele(db, FTAG);
return (err);
}
tx = dmu_tx_create(os);
dmu_tx_hold_spill(tx, db->db_object);
err = dmu_tx_assign(tx, TXG_WAIT);
if (err != 0) {
dmu_buf_rele(db, FTAG);
dmu_buf_rele(db_spill, FTAG);
dmu_tx_abort(tx);
return (err);
}
dmu_buf_will_dirty(db_spill, tx);
if (db_spill->db_size < drrs->drr_length)
VERIFY(0 == dbuf_spill_set_blksz(db_spill,
drrs->drr_length, tx));
bcopy(data, db_spill->db_data, drrs->drr_length);
dmu_buf_rele(db, FTAG);
dmu_buf_rele(db_spill, FTAG);
dmu_tx_commit(tx);
return (0);
}
/* ARGSUSED */
noinline static int
restore_free(struct restorearg *ra, objset_t *os,
struct drr_free *drrf)
{
int err;
if (drrf->drr_length != -1ULL &&
drrf->drr_offset + drrf->drr_length < drrf->drr_offset)
return (SET_ERROR(EINVAL));
if (dmu_object_info(os, drrf->drr_object, NULL) != 0)
return (SET_ERROR(EINVAL));
err = dmu_free_long_range(os, drrf->drr_object,
drrf->drr_offset, drrf->drr_length);
return (err);
}
/* used to destroy the drc_ds on error */
static void
dmu_recv_cleanup_ds(dmu_recv_cookie_t *drc)
{
char name[MAXNAMELEN];
dsl_dataset_name(drc->drc_ds, name);
dsl_dataset_disown(drc->drc_ds, dmu_recv_tag);
(void) dsl_destroy_head(name);
}
/*
* NB: callers *must* call dmu_recv_end() if this succeeds.
*/
int
dmu_recv_stream(dmu_recv_cookie_t *drc, vnode_t *vp, offset_t *voffp,
int cleanup_fd, uint64_t *action_handlep)
{
struct restorearg ra = { 0 };
dmu_replay_record_t *drr;
objset_t *os;
zio_cksum_t pcksum;
int featureflags;
ra.byteswap = drc->drc_byteswap;
ra.cksum = drc->drc_cksum;
ra.vp = vp;
ra.voff = *voffp;
ra.bufsize = 1<<20;
ra.buf = vmem_alloc(ra.bufsize, KM_SLEEP);
/* these were verified in dmu_recv_begin */
ASSERT3U(DMU_GET_STREAM_HDRTYPE(drc->drc_drrb->drr_versioninfo), ==,
DMU_SUBSTREAM);
ASSERT3U(drc->drc_drrb->drr_type, <, DMU_OST_NUMTYPES);
/*
* Open the objset we are modifying.
*/
VERIFY0(dmu_objset_from_ds(drc->drc_ds, &os));
ASSERT(drc->drc_ds->ds_phys->ds_flags & DS_FLAG_INCONSISTENT);
featureflags = DMU_GET_FEATUREFLAGS(drc->drc_drrb->drr_versioninfo);
/* if this stream is dedup'ed, set up the avl tree for guid mapping */
if (featureflags & DMU_BACKUP_FEATURE_DEDUP) {
minor_t minor;
if (cleanup_fd == -1) {
ra.err = SET_ERROR(EBADF);
goto out;
}
ra.err = zfs_onexit_fd_hold(cleanup_fd, &minor);
if (ra.err != 0) {
cleanup_fd = -1;
goto out;
}
if (*action_handlep == 0) {
ra.guid_to_ds_map =
kmem_alloc(sizeof (avl_tree_t), KM_SLEEP);
avl_create(ra.guid_to_ds_map, guid_compare,
sizeof (guid_map_entry_t),
offsetof(guid_map_entry_t, avlnode));
ra.err = zfs_onexit_add_cb(minor,
free_guid_map_onexit, ra.guid_to_ds_map,
action_handlep);
if (ra.err != 0)
goto out;
} else {
ra.err = zfs_onexit_cb_data(minor, *action_handlep,
(void **)&ra.guid_to_ds_map);
if (ra.err != 0)
goto out;
}
drc->drc_guid_to_ds_map = ra.guid_to_ds_map;
}
/*
* Read records and process them.
*/
pcksum = ra.cksum;
while (ra.err == 0 &&
NULL != (drr = restore_read(&ra, sizeof (*drr), NULL))) {
if (issig(JUSTLOOKING) && issig(FORREAL)) {
ra.err = SET_ERROR(EINTR);
goto out;
}
if (ra.byteswap)
backup_byteswap(drr);
switch (drr->drr_type) {
case DRR_OBJECT:
{
/*
* We need to make a copy of the record header,
* because restore_{object,write} may need to
* restore_read(), which will invalidate drr.
*/
struct drr_object drro = drr->drr_u.drr_object;
ra.err = restore_object(&ra, os, &drro);
break;
}
case DRR_FREEOBJECTS:
{
struct drr_freeobjects drrfo =
drr->drr_u.drr_freeobjects;
ra.err = restore_freeobjects(&ra, os, &drrfo);
break;
}
case DRR_WRITE:
{
struct drr_write drrw = drr->drr_u.drr_write;
ra.err = restore_write(&ra, os, &drrw);
break;
}
case DRR_WRITE_BYREF:
{
struct drr_write_byref drrwbr =
drr->drr_u.drr_write_byref;
ra.err = restore_write_byref(&ra, os, &drrwbr);
break;
}
case DRR_WRITE_EMBEDDED:
{
struct drr_write_embedded drrwe =
drr->drr_u.drr_write_embedded;
ra.err = restore_write_embedded(&ra, os, &drrwe);
break;
}
case DRR_FREE:
{
struct drr_free drrf = drr->drr_u.drr_free;
ra.err = restore_free(&ra, os, &drrf);
break;
}
case DRR_END:
{
struct drr_end drre = drr->drr_u.drr_end;
/*
* We compare against the *previous* checksum
* value, because the stored checksum is of
* everything before the DRR_END record.
*/
if (!ZIO_CHECKSUM_EQUAL(drre.drr_checksum, pcksum))
ra.err = SET_ERROR(ECKSUM);
goto out;
}
case DRR_SPILL:
{
struct drr_spill drrs = drr->drr_u.drr_spill;
ra.err = restore_spill(&ra, os, &drrs);
break;
}
default:
ra.err = SET_ERROR(EINVAL);
goto out;
}
pcksum = ra.cksum;
}
ASSERT(ra.err != 0);
out:
if ((featureflags & DMU_BACKUP_FEATURE_DEDUP) && (cleanup_fd != -1))
zfs_onexit_fd_rele(cleanup_fd);
if (ra.err != 0) {
/*
* destroy what we created, so we don't leave it in the
* inconsistent restoring state.
*/
dmu_recv_cleanup_ds(drc);
}
vmem_free(ra.buf, ra.bufsize);
*voffp = ra.voff;
return (ra.err);
}
static int
dmu_recv_end_check(void *arg, dmu_tx_t *tx)
{
dmu_recv_cookie_t *drc = arg;
dsl_pool_t *dp = dmu_tx_pool(tx);
int error;
ASSERT3P(drc->drc_ds->ds_owner, ==, dmu_recv_tag);
if (!drc->drc_newfs) {
dsl_dataset_t *origin_head;
error = dsl_dataset_hold(dp, drc->drc_tofs, FTAG, &origin_head);
if (error != 0)
return (error);
if (drc->drc_force) {
/*
* We will destroy any snapshots in tofs (i.e. before
* origin_head) that are after the origin (which is
* the snap before drc_ds, because drc_ds can not
* have any snaps of its own).
*/
uint64_t obj = origin_head->ds_phys->ds_prev_snap_obj;
while (obj != drc->drc_ds->ds_phys->ds_prev_snap_obj) {
dsl_dataset_t *snap;
error = dsl_dataset_hold_obj(dp, obj, FTAG,
&snap);
if (error != 0)
return (error);
if (snap->ds_dir != origin_head->ds_dir)
error = SET_ERROR(EINVAL);
if (error == 0) {
error = dsl_destroy_snapshot_check_impl(
snap, B_FALSE);
}
obj = snap->ds_phys->ds_prev_snap_obj;
dsl_dataset_rele(snap, FTAG);
if (error != 0)
return (error);
}
}
error = dsl_dataset_clone_swap_check_impl(drc->drc_ds,
origin_head, drc->drc_force, drc->drc_owner, tx);
if (error != 0) {
dsl_dataset_rele(origin_head, FTAG);
return (error);
}
error = dsl_dataset_snapshot_check_impl(origin_head,
drc->drc_tosnap, tx, B_TRUE, 1, drc->drc_cred);
dsl_dataset_rele(origin_head, FTAG);
if (error != 0)
return (error);
error = dsl_destroy_head_check_impl(drc->drc_ds, 1);
} else {
error = dsl_dataset_snapshot_check_impl(drc->drc_ds,
drc->drc_tosnap, tx, B_TRUE, 1, drc->drc_cred);
}
return (error);
}
static void
dmu_recv_end_sync(void *arg, dmu_tx_t *tx)
{
dmu_recv_cookie_t *drc = arg;
dsl_pool_t *dp = dmu_tx_pool(tx);
spa_history_log_internal_ds(drc->drc_ds, "finish receiving",
tx, "snap=%s", drc->drc_tosnap);
if (!drc->drc_newfs) {
dsl_dataset_t *origin_head;
VERIFY0(dsl_dataset_hold(dp, drc->drc_tofs, FTAG,
&origin_head));
if (drc->drc_force) {
/*
* Destroy any snapshots of drc_tofs (origin_head)
* after the origin (the snap before drc_ds).
*/
uint64_t obj = origin_head->ds_phys->ds_prev_snap_obj;
while (obj != drc->drc_ds->ds_phys->ds_prev_snap_obj) {
dsl_dataset_t *snap;
VERIFY0(dsl_dataset_hold_obj(dp, obj, FTAG,
&snap));
ASSERT3P(snap->ds_dir, ==, origin_head->ds_dir);
obj = snap->ds_phys->ds_prev_snap_obj;
dsl_destroy_snapshot_sync_impl(snap,
B_FALSE, tx);
dsl_dataset_rele(snap, FTAG);
}
}
VERIFY3P(drc->drc_ds->ds_prev, ==,
origin_head->ds_prev);
dsl_dataset_clone_swap_sync_impl(drc->drc_ds,
origin_head, tx);
dsl_dataset_snapshot_sync_impl(origin_head,
drc->drc_tosnap, tx);
/* set snapshot's creation time and guid */
dmu_buf_will_dirty(origin_head->ds_prev->ds_dbuf, tx);
origin_head->ds_prev->ds_phys->ds_creation_time =
drc->drc_drrb->drr_creation_time;
origin_head->ds_prev->ds_phys->ds_guid =
drc->drc_drrb->drr_toguid;
origin_head->ds_prev->ds_phys->ds_flags &=
~DS_FLAG_INCONSISTENT;
dmu_buf_will_dirty(origin_head->ds_dbuf, tx);
origin_head->ds_phys->ds_flags &= ~DS_FLAG_INCONSISTENT;
dsl_dataset_rele(origin_head, FTAG);
dsl_destroy_head_sync_impl(drc->drc_ds, tx);
if (drc->drc_owner != NULL)
VERIFY3P(origin_head->ds_owner, ==, drc->drc_owner);
} else {
dsl_dataset_t *ds = drc->drc_ds;
dsl_dataset_snapshot_sync_impl(ds, drc->drc_tosnap, tx);
/* set snapshot's creation time and guid */
dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx);
ds->ds_prev->ds_phys->ds_creation_time =
drc->drc_drrb->drr_creation_time;
ds->ds_prev->ds_phys->ds_guid = drc->drc_drrb->drr_toguid;
ds->ds_prev->ds_phys->ds_flags &= ~DS_FLAG_INCONSISTENT;
dmu_buf_will_dirty(ds->ds_dbuf, tx);
ds->ds_phys->ds_flags &= ~DS_FLAG_INCONSISTENT;
}
drc->drc_newsnapobj = drc->drc_ds->ds_phys->ds_prev_snap_obj;
/*
* Release the hold from dmu_recv_begin. This must be done before
* we return to open context, so that when we free the dataset's dnode,
* we can evict its bonus buffer.
*/
dsl_dataset_disown(drc->drc_ds, dmu_recv_tag);
drc->drc_ds = NULL;
}
static int
add_ds_to_guidmap(const char *name, avl_tree_t *guid_map, uint64_t snapobj)
{
dsl_pool_t *dp;
dsl_dataset_t *snapds;
guid_map_entry_t *gmep;
int err;
ASSERT(guid_map != NULL);
err = dsl_pool_hold(name, FTAG, &dp);
if (err != 0)
return (err);
gmep = kmem_alloc(sizeof (*gmep), KM_SLEEP);
err = dsl_dataset_hold_obj(dp, snapobj, gmep, &snapds);
if (err == 0) {
gmep->guid = snapds->ds_phys->ds_guid;
gmep->gme_ds = snapds;
avl_add(guid_map, gmep);
dsl_dataset_long_hold(snapds, gmep);
} else {
kmem_free(gmep, sizeof (*gmep));
}
dsl_pool_rele(dp, FTAG);
return (err);
}
static int dmu_recv_end_modified_blocks = 3;
static int
dmu_recv_existing_end(dmu_recv_cookie_t *drc)
{
int error;
#ifdef _KERNEL
char *name;
/*
* We will be destroying the ds; make sure its origin is unmounted if
* necessary.
*/
name = kmem_alloc(MAXNAMELEN, KM_SLEEP);
dsl_dataset_name(drc->drc_ds, name);
zfs_destroy_unmount_origin(name);
kmem_free(name, MAXNAMELEN);
#endif
error = dsl_sync_task(drc->drc_tofs,
dmu_recv_end_check, dmu_recv_end_sync, drc,
dmu_recv_end_modified_blocks);
if (error != 0)
dmu_recv_cleanup_ds(drc);
return (error);
}
static int
dmu_recv_new_end(dmu_recv_cookie_t *drc)
{
int error;
error = dsl_sync_task(drc->drc_tofs,
dmu_recv_end_check, dmu_recv_end_sync, drc,
dmu_recv_end_modified_blocks);
if (error != 0) {
dmu_recv_cleanup_ds(drc);
} else if (drc->drc_guid_to_ds_map != NULL) {
(void) add_ds_to_guidmap(drc->drc_tofs,
drc->drc_guid_to_ds_map,
drc->drc_newsnapobj);
}
return (error);
}
int
dmu_recv_end(dmu_recv_cookie_t *drc, void *owner)
{
drc->drc_owner = owner;
if (drc->drc_newfs)
return (dmu_recv_new_end(drc));
else
return (dmu_recv_existing_end(drc));
}
/*
* Return TRUE if this objset is currently being received into.
*/
boolean_t
dmu_objset_is_receiving(objset_t *os)
{
return (os->os_dsl_dataset != NULL &&
os->os_dsl_dataset->ds_owner == dmu_recv_tag);
}
#if defined(_KERNEL)
module_param(zfs_send_corrupt_data, int, 0644);
MODULE_PARM_DESC(zfs_send_corrupt_data, "Allow sending corrupt data");
#endif
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