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mirror_zfs/module/zfs/dmu_send.c
Paul Dagnelie fcff0f35bd Illumos 5960, 5925 
5960 zfs recv should prefetch indirect blocks
5925 zfs receive -o origin=
Reviewed by: Prakash Surya <prakash.surya@delphix.com>
Reviewed by: Matthew Ahrens <mahrens@delphix.com>

References:
  https://www.illumos.org/issues/5960
  https://www.illumos.org/issues/5925
  https://github.com/illumos/illumos-gate/commit/a2cdcdd

Porting notes:
- [lib/libzfs/libzfs_sendrecv.c]
  - b8864a2 Fix gcc cast warnings
  - 325f023 Add linux kernel device support
  - 5c3f61e Increase Linux pipe buffer size on 'zfs receive'
- [module/zfs/zfs_vnops.c]
  - 3558fd7 Prototype/structure update for Linux
  - c12e3a5 Restructure zfs_readdir() to fix regressions
- [module/zfs/zvol.c]
  - Function @zvol_map_block() isn't needed in ZoL
  - 9965059 Prefetch start and end of volumes
- [module/zfs/dmu.c]
  - Fixed ISO C90 - mixed declarations and code
  - Function dmu_prefetch() 'int i' is initialized before
    the following code block (c90 vs. c99)
- [module/zfs/dbuf.c]
  - fc5bb51 Fix stack dbuf_hold_impl()
  - 9b67f60 Illumos 4757, 4913
  - 34229a2 Reduce stack usage for recursive traverse_visitbp()
- [module/zfs/dmu_send.c]
  - Fixed ISO C90 - mixed declarations and code
  - b58986e Use large stacks when available
  - 241b541 Illumos 5959 - clean up per-dataset feature count code
  - 77aef6f Use vmem_alloc() for nvlists
  - 00b4602 Add linux kernel memory support

Ported-by: kernelOfTruth kerneloftruth@gmail.com
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2016-01-08 15:08:19 -08:00

2758 lines
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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, 2015 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>
#include <sys/bqueue.h>
/* Set this tunable to TRUE to replace corrupt data with 0x2f5baddb10c */
int zfs_send_corrupt_data = B_FALSE;
int zfs_send_queue_length = 16 * 1024 * 1024;
int zfs_recv_queue_length = 16 * 1024 * 1024;
static char *dmu_recv_tag = "dmu_recv_tag";
static const char *recv_clone_name = "%recv";
#define BP_SPAN(datablkszsec, indblkshift, level) \
(((uint64_t)datablkszsec) << (SPA_MINBLOCKSHIFT + \
(level) * (indblkshift - SPA_BLKPTRSHIFT)))
struct send_thread_arg {
bqueue_t q;
dsl_dataset_t *ds; /* Dataset to traverse */
uint64_t fromtxg; /* Traverse from this txg */
int flags; /* flags to pass to traverse_dataset */
int error_code;
boolean_t cancel;
};
struct send_block_record {
boolean_t eos_marker; /* Marks the end of the stream */
blkptr_t bp;
zbookmark_phys_t zb;
uint8_t indblkshift;
uint16_t datablkszsec;
bqueue_node_t ln;
};
typedef struct dump_bytes_io {
dmu_sendarg_t *dbi_dsp;
void *dbi_buf;
int dbi_len;
} dump_bytes_io_t;
static void
dump_bytes_cb(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);
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;
#if defined(HAVE_LARGE_STACKS)
dump_bytes_cb(&dbi);
#else
/*
* 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_cb, &dbi, TQ_SLEEP);
#endif /* HAVE_LARGE_STACKS */
return (dsp->dsa_err);
}
/*
* For all record types except BEGIN, fill in the checksum (overlaid in
* drr_u.drr_checksum.drr_checksum). The checksum verifies everything
* up to the start of the checksum itself.
*/
static int
dump_record(dmu_sendarg_t *dsp, void *payload, int payload_len)
{
ASSERT3U(offsetof(dmu_replay_record_t, drr_u.drr_checksum.drr_checksum),
==, sizeof (dmu_replay_record_t) - sizeof (zio_cksum_t));
fletcher_4_incremental_native(dsp->dsa_drr,
offsetof(dmu_replay_record_t, drr_u.drr_checksum.drr_checksum),
&dsp->dsa_zc);
if (dsp->dsa_drr->drr_type != DRR_BEGIN) {
ASSERT(ZIO_CHECKSUM_IS_ZERO(&dsp->dsa_drr->drr_u.
drr_checksum.drr_checksum));
dsp->dsa_drr->drr_u.drr_checksum.drr_checksum = dsp->dsa_zc;
}
fletcher_4_incremental_native(&dsp->dsa_drr->
drr_u.drr_checksum.drr_checksum,
sizeof (zio_cksum_t), &dsp->dsa_zc);
if (dump_bytes(dsp, dsp->dsa_drr, sizeof (dmu_replay_record_t)) != 0)
return (SET_ERROR(EINTR));
if (payload_len != 0) {
fletcher_4_incremental_native(payload, payload_len,
&dsp->dsa_zc);
if (dump_bytes(dsp, payload, payload_len) != 0)
return (SET_ERROR(EINTR));
}
return (0);
}
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_record(dsp, NULL, 0) != 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_record(dsp, NULL, 0) != 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_record(dsp, NULL, 0) != 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_record(dsp, NULL, 0) != 0)
return (SET_ERROR(EINTR));
dsp->dsa_pending_op = PENDING_NONE;
}
/* write a WRITE 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 == NULL || BP_IS_EMBEDDED(bp)) {
/*
* There's no pre-computed checksum for partial-block
* writes or 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_record(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_record(dsp, NULL, 0) != 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_record(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_record(dsp, NULL, 0) != 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_record(dsp, data, blksz) != 0)
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_record(dsp, NULL, 0) != 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_record(dsp, NULL, 0) != 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_record(dsp, NULL, 0) != 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 (!(dsp->dsa_featureflags & DMU_BACKUP_FEATURE_LARGE_BLOCKS) &&
drro->drr_blksz > SPA_OLD_MAXBLOCKSIZE)
drro->drr_blksz = SPA_OLD_MAXBLOCKSIZE;
if (dump_record(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);
}
/*
* This is the callback function to traverse_dataset that acts as the worker
* thread for dmu_send_impl.
*/
/*ARGSUSED*/
static int
send_cb(spa_t *spa, zilog_t *zilog, const blkptr_t *bp,
const zbookmark_phys_t *zb, const struct dnode_phys *dnp, void *arg)
{
struct send_thread_arg *sta = arg;
struct send_block_record *record;
uint64_t record_size;
int err = 0;
if (sta->cancel)
return (SET_ERROR(EINTR));
if (bp == NULL) {
ASSERT3U(zb->zb_level, ==, ZB_DNODE_LEVEL);
return (0);
} else if (zb->zb_level < 0) {
return (0);
}
record = kmem_zalloc(sizeof (struct send_block_record), KM_SLEEP);
record->eos_marker = B_FALSE;
record->bp = *bp;
record->zb = *zb;
record->indblkshift = dnp->dn_indblkshift;
record->datablkszsec = dnp->dn_datablkszsec;
record_size = dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT;
bqueue_enqueue(&sta->q, record, record_size);
return (err);
}
/*
* This function kicks off the traverse_dataset. It also handles setting the
* error code of the thread in case something goes wrong, and pushes the End of
* Stream record when the traverse_dataset call has finished. If there is no
* dataset to traverse, the thread immediately pushes End of Stream marker.
*/
static void
send_traverse_thread(void *arg)
{
struct send_thread_arg *st_arg = arg;
int err;
struct send_block_record *data;
if (st_arg->ds != NULL) {
err = traverse_dataset(st_arg->ds, st_arg->fromtxg,
st_arg->flags, send_cb, arg);
if (err != EINTR)
st_arg->error_code = err;
}
data = kmem_zalloc(sizeof (*data), KM_SLEEP);
data->eos_marker = B_TRUE;
bqueue_enqueue(&st_arg->q, data, 1);
}
/*
* This function actually handles figuring out what kind of record needs to be
* dumped, reading the data (which has hopefully been prefetched), and calling
* the appropriate helper function.
*/
static int
do_dump(dmu_sendarg_t *dsa, struct send_block_record *data)
{
dsl_dataset_t *ds = dmu_objset_ds(dsa->dsa_os);
const blkptr_t *bp = &data->bp;
const zbookmark_phys_t *zb = &data->zb;
uint8_t indblkshift = data->indblkshift;
uint16_t dblkszsec = data->datablkszsec;
spa_t *spa = ds->ds_dir->dd_pool->dp_spa;
dmu_object_type_t type = bp ? BP_GET_TYPE(bp) : DMU_OT_NONE;
int err = 0;
dnode_phys_t *blk;
uint64_t dnobj;
ASSERT3U(zb->zb_level, >=, 0);
if (zb->zb_object != DMU_META_DNODE_OBJECT &&
DMU_OBJECT_IS_SPECIAL(zb->zb_object)) {
return (0);
} else if (BP_IS_HOLE(bp) &&
zb->zb_object == DMU_META_DNODE_OBJECT) {
uint64_t span = BP_SPAN(dblkszsec, indblkshift, zb->zb_level);
uint64_t dnobj = (zb->zb_blkid * span) >> DNODE_SHIFT;
err = dump_freeobjects(dsa, dnobj, span >> DNODE_SHIFT);
} else if (BP_IS_HOLE(bp)) {
uint64_t span = BP_SPAN(dblkszsec, indblkshift, zb->zb_level);
uint64_t offset = zb->zb_blkid * span;
err = dump_free(dsa, zb->zb_object, offset, span);
} else if (zb->zb_level > 0 || type == DMU_OT_OBJSET) {
return (0);
} else if (type == DMU_OT_DNODE) {
int blksz = BP_GET_LSIZE(bp);
arc_flags_t aflags = ARC_FLAG_WAIT;
arc_buf_t *abuf;
int i;
ASSERT0(zb->zb_level);
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;
dnobj = zb->zb_blkid * (blksz >> DNODE_SHIFT);
for (i = 0; i < blksz >> DNODE_SHIFT; i++) {
err = dump_dnode(dsa, dnobj + i, blk + i);
if (err != 0)
break;
}
(void) arc_buf_remove_ref(abuf, &abuf);
} else if (type == DMU_OT_SA) {
arc_flags_t aflags = ARC_FLAG_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(dsa, zb->zb_object, blksz, abuf->b_data);
(void) arc_buf_remove_ref(abuf, &abuf);
} else if (backup_do_embed(dsa, bp)) {
/* it's an embedded level-0 block of a regular object */
int blksz = dblkszsec << SPA_MINBLOCKSHIFT;
ASSERT0(zb->zb_level);
err = dump_write_embedded(dsa, zb->zb_object,
zb->zb_blkid * blksz, blksz, bp);
} else {
/* it's a level-0 block of a regular object */
arc_flags_t aflags = ARC_FLAG_WAIT;
arc_buf_t *abuf;
int blksz = dblkszsec << SPA_MINBLOCKSHIFT;
uint64_t offset;
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));
}
}
offset = zb->zb_blkid * blksz;
if (!(dsa->dsa_featureflags &
DMU_BACKUP_FEATURE_LARGE_BLOCKS) &&
blksz > SPA_OLD_MAXBLOCKSIZE) {
char *buf = abuf->b_data;
while (blksz > 0 && err == 0) {
int n = MIN(blksz, SPA_OLD_MAXBLOCKSIZE);
err = dump_write(dsa, type, zb->zb_object,
offset, n, NULL, buf);
offset += n;
buf += n;
blksz -= n;
}
} else {
err = dump_write(dsa, type, zb->zb_object,
offset, blksz, bp, abuf->b_data);
}
(void) arc_buf_remove_ref(abuf, &abuf);
}
ASSERT(err == 0 || err == EINTR);
return (err);
}
/*
* Pop the new data off the queue, and free the old data.
*/
static struct send_block_record *
get_next_record(bqueue_t *bq, struct send_block_record *data)
{
struct send_block_record *tmp = bqueue_dequeue(bq);
kmem_free(data, sizeof (*data));
return (tmp);
}
/*
* Actually do the bulk of the work in a zfs send.
*
* Note: Releases dp using the specified tag.
*/
static int
dmu_send_impl(void *tag, dsl_pool_t *dp, dsl_dataset_t *to_ds,
zfs_bookmark_phys_t *ancestor_zb, boolean_t is_clone, boolean_t embedok,
boolean_t large_block_ok, 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;
struct send_thread_arg to_arg;
struct send_block_record *to_data;
err = dmu_objset_from_ds(to_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 (large_block_ok && to_ds->ds_feature_inuse[SPA_FEATURE_LARGE_BLOCKS])
featureflags |= DMU_BACKUP_FEATURE_LARGE_BLOCKS;
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;
}
DMU_SET_FEATUREFLAGS(drr->drr_u.drr_begin.drr_versioninfo,
featureflags);
drr->drr_u.drr_begin.drr_creation_time =
dsl_dataset_phys(to_ds)->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 = dsl_dataset_phys(to_ds)->ds_guid;
if (dsl_dataset_phys(to_ds)->ds_flags & DS_FLAG_CI_DATASET)
drr->drr_u.drr_begin.drr_flags |= DRR_FLAG_CI_DATA;
if (ancestor_zb != NULL) {
drr->drr_u.drr_begin.drr_fromguid =
ancestor_zb->zbm_guid;
fromtxg = ancestor_zb->zbm_creation_txg;
}
dsl_dataset_name(to_ds, drr->drr_u.drr_begin.drr_toname);
if (!to_ds->ds_is_snapshot) {
(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 = dsl_dataset_phys(to_ds)->ds_guid;
dsp->dsa_pending_op = PENDING_NONE;
dsp->dsa_incremental = (ancestor_zb != NULL);
dsp->dsa_featureflags = featureflags;
mutex_enter(&to_ds->ds_sendstream_lock);
list_insert_head(&to_ds->ds_sendstreams, dsp);
mutex_exit(&to_ds->ds_sendstream_lock);
dsl_dataset_long_hold(to_ds, FTAG);
dsl_pool_rele(dp, tag);
if (dump_record(dsp, NULL, 0) != 0) {
err = dsp->dsa_err;
goto out;
}
err = bqueue_init(&to_arg.q, zfs_send_queue_length,
offsetof(struct send_block_record, ln));
to_arg.error_code = 0;
to_arg.cancel = B_FALSE;
to_arg.ds = to_ds;
to_arg.fromtxg = fromtxg;
to_arg.flags = TRAVERSE_PRE | TRAVERSE_PREFETCH;
(void) thread_create(NULL, 0, send_traverse_thread, &to_arg, 0, curproc,
TS_RUN, minclsyspri);
to_data = bqueue_dequeue(&to_arg.q);
while (!to_data->eos_marker && err == 0) {
err = do_dump(dsp, to_data);
to_data = get_next_record(&to_arg.q, to_data);
if (issig(JUSTLOOKING) && issig(FORREAL))
err = EINTR;
}
if (err != 0) {
to_arg.cancel = B_TRUE;
while (!to_data->eos_marker) {
to_data = get_next_record(&to_arg.q, to_data);
}
}
kmem_free(to_data, sizeof (*to_data));
bqueue_destroy(&to_arg.q);
if (err == 0 && to_arg.error_code != 0)
err = to_arg.error_code;
if (err != 0)
goto out;
if (dsp->dsa_pending_op != PENDING_NONE)
if (dump_record(dsp, NULL, 0) != 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_record(dsp, NULL, 0) != 0)
err = dsp->dsa_err;
out:
mutex_enter(&to_ds->ds_sendstream_lock);
list_remove(&to_ds->ds_sendstreams, dsp);
mutex_exit(&to_ds->ds_sendstream_lock);
kmem_free(drr, sizeof (dmu_replay_record_t));
kmem_free(dsp, sizeof (dmu_sendarg_t));
dsl_dataset_long_rele(to_ds, FTAG);
return (err);
}
int
dmu_send_obj(const char *pool, uint64_t tosnap, uint64_t fromsnap,
boolean_t embedok, boolean_t large_block_ok,
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 =
dsl_dataset_phys(fromds)->ds_creation_time;
zb.zbm_creation_txg = dsl_dataset_phys(fromds)->ds_creation_txg;
zb.zbm_guid = dsl_dataset_phys(fromds)->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, large_block_ok, outfd, vp, off);
} else {
err = dmu_send_impl(FTAG, dp, ds, NULL, B_FALSE,
embedok, large_block_ok, outfd, vp, off);
}
dsl_dataset_rele(ds, FTAG);
return (err);
}
int
dmu_send(const char *tosnap, const char *fromsnap,
boolean_t embedok, boolean_t large_block_ok,
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 =
dsl_dataset_phys(fromds)->ds_creation_time;
zb.zbm_creation_txg =
dsl_dataset_phys(fromds)->ds_creation_txg;
zb.zbm_guid = dsl_dataset_phys(fromds)->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, large_block_ok, outfd, vp, off);
} else {
err = dmu_send_impl(FTAG, dp, ds, NULL, B_FALSE,
embedok, large_block_ok, outfd, vp, off);
}
if (owned)
dsl_dataset_disown(ds, FTAG);
else
dsl_dataset_rele(ds, FTAG);
return (err);
}
static int
dmu_adjust_send_estimate_for_indirects(dsl_dataset_t *ds, uint64_t size,
uint64_t *sizep)
{
int 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.
*/
uint64_t recordsize;
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);
}
int
dmu_send_estimate(dsl_dataset_t *ds, dsl_dataset_t *fromds, uint64_t *sizep)
{
int err;
uint64_t size;
ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool));
/* tosnap must be a snapshot */
if (!ds->ds_is_snapshot)
return (SET_ERROR(EINVAL));
/* fromsnap, if provided, must be a snapshot */
if (fromds != NULL && !fromds->ds_is_snapshot)
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 = dsl_dataset_phys(ds)->ds_uncompressed_bytes;
} else {
uint64_t used, comp;
err = dsl_dataset_space_written(fromds, ds,
&used, &comp, &size);
if (err != 0)
return (err);
}
err = dmu_adjust_send_estimate_for_indirects(ds, size, sizep);
return (err);
}
/*
* Simple callback used to traverse the blocks of a snapshot and sum their
* uncompressed size
*/
/* ARGSUSED */
static int
dmu_calculate_send_traversal(spa_t *spa, zilog_t *zilog, const blkptr_t *bp,
const zbookmark_phys_t *zb, const dnode_phys_t *dnp, void *arg)
{
uint64_t *spaceptr = arg;
if (bp != NULL && !BP_IS_HOLE(bp)) {
*spaceptr += BP_GET_UCSIZE(bp);
}
return (0);
}
/*
* Given a desination snapshot and a TXG, calculate the approximate size of a
* send stream sent from that TXG. from_txg may be zero, indicating that the
* whole snapshot will be sent.
*/
int
dmu_send_estimate_from_txg(dsl_dataset_t *ds, uint64_t from_txg,
uint64_t *sizep)
{
int err;
uint64_t size = 0;
ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool));
/* tosnap must be a snapshot */
if (!dsl_dataset_is_snapshot(ds))
return (SET_ERROR(EINVAL));
/* verify that from_txg is before the provided snapshot was taken */
if (from_txg >= dsl_dataset_phys(ds)->ds_creation_txg) {
return (SET_ERROR(EXDEV));
}
/*
* traverse the blocks of the snapshot with birth times after
* from_txg, summing their uncompressed size
*/
err = traverse_dataset(ds, from_txg, TRAVERSE_POST,
dmu_calculate_send_traversal, &size);
if (err)
return (err);
err = dmu_adjust_send_estimate_for_indirects(ds, size, sizep);
return (err);
}
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,
dsl_dir_phys(ds->ds_dir)->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,
dsl_dataset_phys(ds)->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 = dsl_dataset_phys(ds)->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 (dsl_dataset_phys(snap)->ds_guid == fromguid)
break;
obj = dsl_dataset_phys(snap)->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, then must be forced */
if (!drba->drba_cookie->drc_force)
return (SET_ERROR(EEXIST));
/* start from $ORIGIN@$ORIGIN, if supported */
drba->drba_snapobj = dp->dp_origin_snap != NULL ?
dp->dp_origin_snap->ds_object : 0;
}
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));
/*
* The receiving code doesn't know how to translate large blocks
* to smaller ones, so the pool must have the LARGE_BLOCKS
* feature enabled if the stream has LARGE_BLOCKS.
*/
if ((featureflags & DMU_BACKUP_FEATURE_LARGE_BLOCKS) &&
!spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_LARGE_BLOCKS))
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 ||
drba->drba_origin))
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 (!origin->ds_is_snapshot) {
dsl_dataset_rele(origin, FTAG);
dsl_dataset_rele(ds, FTAG);
return (SET_ERROR(EINVAL));
}
if (dsl_dataset_phys(origin)->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);
dsl_dataset_phys(newds)->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, ZFS_SPACE_CHECK_NORMAL));
}
struct receive_record_arg {
dmu_replay_record_t header;
void *payload; /* Pointer to a buffer containing the payload */
/*
* If the record is a write, pointer to the arc_buf_t containing the
* payload.
*/
arc_buf_t *write_buf;
int payload_size;
boolean_t eos_marker; /* Marks the end of the stream */
bqueue_node_t node;
};
struct receive_writer_arg {
objset_t *os;
boolean_t byteswap;
bqueue_t q;
/*
* These three args are used to signal to the main thread that we're
* done.
*/
kmutex_t mutex;
kcondvar_t cv;
boolean_t done;
int err;
/* A map from guid to dataset to help handle dedup'd streams. */
avl_tree_t *guid_to_ds_map;
};
struct receive_arg {
objset_t *os;
vnode_t *vp; /* The vnode to read the stream from */
uint64_t voff; /* The current offset in the stream */
/*
* A record that has had its payload read in, but hasn't yet been handed
* off to the worker thread.
*/
struct receive_record_arg *rrd;
/* A record that has had its header read in, but not its payload. */
struct receive_record_arg *next_rrd;
zio_cksum_t cksum;
zio_cksum_t prev_cksum;
int err;
boolean_t byteswap;
/* Sorted list of objects not to issue prefetches for. */
list_t ignore_obj_list;
};
struct receive_ign_obj_node {
list_node_t node;
uint64_t object;
};
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 int
receive_read(struct receive_arg *ra, int len, void *buf)
{
int done = 0;
/* 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,
(char *)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 (ra->err);
}
ASSERT3U(done, ==, len);
return (0);
}
noinline static void
byteswap_record(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);
ZIO_CHECKSUM_BSWAP(&drr->drr_u.drr_write.drr_key.ddk_cksum);
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);
ZIO_CHECKSUM_BSWAP(&drr->drr_u.drr_write_byref.
drr_key.ddk_cksum);
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_toguid);
ZIO_CHECKSUM_BSWAP(&drr->drr_u.drr_end.drr_checksum);
break;
default:
break;
}
if (drr->drr_type != DRR_BEGIN) {
ZIO_CHECKSUM_BSWAP(&drr->drr_u.drr_checksum.drr_checksum);
}
#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
receive_object(struct receive_writer_arg *rwa, struct drr_object *drro,
void *data)
{
dmu_object_info_t doi;
dmu_tx_t *tx;
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(dmu_objset_spa(rwa->os)) ||
drro->drr_bonuslen > DN_MAX_BONUSLEN) {
return (SET_ERROR(EINVAL));
}
err = dmu_object_info(rwa->os, drro->drr_object, &doi);
if (err != 0 && err != ENOENT)
return (SET_ERROR(EINVAL));
object = err == 0 ? drro->drr_object : DMU_NEW_OBJECT;
/*
* 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(rwa->os, drro->drr_object,
0, DMU_OBJECT_END);
if (err != 0)
return (SET_ERROR(EINVAL));
}
}
tx = dmu_tx_create(rwa->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(rwa->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(rwa->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(rwa->os, drro->drr_object,
drro->drr_checksumtype, tx);
dmu_object_set_compress(rwa->os, drro->drr_object,
drro->drr_compress, tx);
if (data != NULL) {
dmu_buf_t *db;
VERIFY0(dmu_bonus_hold(rwa->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 (rwa->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
receive_freeobjects(struct receive_writer_arg *rwa,
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(rwa->os, &obj, FALSE, 0)) {
int err;
if (dmu_object_info(rwa->os, obj, NULL) != 0)
continue;
err = dmu_free_long_object(rwa->os, obj);
if (err != 0)
return (err);
}
return (0);
}
noinline static int
receive_write(struct receive_writer_arg *rwa, struct drr_write *drrw,
arc_buf_t *abuf)
{
dmu_tx_t *tx;
dmu_buf_t *bonus;
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(rwa->os, drrw->drr_object, NULL) != 0)
return (SET_ERROR(EINVAL));
tx = dmu_tx_create(rwa->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_tx_abort(tx);
return (err);
}
if (rwa->byteswap) {
dmu_object_byteswap_t byteswap =
DMU_OT_BYTESWAP(drrw->drr_type);
dmu_ot_byteswap[byteswap].ob_func(abuf->b_data,
drrw->drr_length);
}
if (dmu_bonus_hold(rwa->os, drrw->drr_object, FTAG, &bonus) != 0)
return (SET_ERROR(EINVAL));
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
receive_write_byref(struct receive_writer_arg *rwa,
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(rwa->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 = rwa->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(rwa->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(rwa->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
receive_write_embedded(struct receive_writer_arg *rwa,
struct drr_write_embedded *drrwnp, void *data)
{
dmu_tx_t *tx;
int err;
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);
tx = dmu_tx_create(rwa->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(rwa->os, drrwnp->drr_object,
drrwnp->drr_offset, data, drrwnp->drr_etype,
drrwnp->drr_compression, drrwnp->drr_lsize, drrwnp->drr_psize,
rwa->byteswap ^ ZFS_HOST_BYTEORDER, tx);
dmu_tx_commit(tx);
return (0);
}
static int
receive_spill(struct receive_writer_arg *rwa, struct drr_spill *drrs,
void *data)
{
dmu_tx_t *tx;
dmu_buf_t *db, *db_spill;
int err;
if (drrs->drr_length < SPA_MINBLOCKSIZE ||
drrs->drr_length > spa_maxblocksize(dmu_objset_spa(rwa->os)))
return (SET_ERROR(EINVAL));
if (dmu_object_info(rwa->os, drrs->drr_object, NULL) != 0)
return (SET_ERROR(EINVAL));
VERIFY0(dmu_bonus_hold(rwa->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(rwa->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
receive_free(struct receive_writer_arg *rwa, 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(rwa->os, drrf->drr_object, NULL) != 0)
return (SET_ERROR(EINVAL));
err = dmu_free_long_range(rwa->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);
}
static void
receive_cksum(struct receive_arg *ra, int len, void *buf)
{
if (ra->byteswap) {
fletcher_4_incremental_byteswap(buf, len, &ra->cksum);
} else {
fletcher_4_incremental_native(buf, len, &ra->cksum);
}
}
/*
* Read the payload into a buffer of size len, and update the current record's
* payload field.
* Allocate ra->next_rrd and read the next record's header into
* ra->next_rrd->header.
* Verify checksum of payload and next record.
*/
static int
receive_read_payload_and_next_header(struct receive_arg *ra, int len, void *buf)
{
int err;
zio_cksum_t cksum_orig;
zio_cksum_t *cksump;
if (len != 0) {
ASSERT3U(len, <=, SPA_MAXBLOCKSIZE);
ra->rrd->payload = buf;
ra->rrd->payload_size = len;
err = receive_read(ra, len, ra->rrd->payload);
if (err != 0)
return (err);
receive_cksum(ra, len, ra->rrd->payload);
}
ra->prev_cksum = ra->cksum;
ra->next_rrd = kmem_zalloc(sizeof (*ra->next_rrd), KM_SLEEP);
err = receive_read(ra, sizeof (ra->next_rrd->header),
&ra->next_rrd->header);
if (err != 0) {
kmem_free(ra->next_rrd, sizeof (*ra->next_rrd));
ra->next_rrd = NULL;
return (err);
}
if (ra->next_rrd->header.drr_type == DRR_BEGIN) {
kmem_free(ra->next_rrd, sizeof (*ra->next_rrd));
ra->next_rrd = NULL;
return (SET_ERROR(EINVAL));
}
/*
* Note: checksum is of everything up to but not including the
* checksum itself.
*/
ASSERT3U(offsetof(dmu_replay_record_t, drr_u.drr_checksum.drr_checksum),
==, sizeof (dmu_replay_record_t) - sizeof (zio_cksum_t));
receive_cksum(ra,
offsetof(dmu_replay_record_t, drr_u.drr_checksum.drr_checksum),
&ra->next_rrd->header);
cksum_orig = ra->next_rrd->header.drr_u.drr_checksum.drr_checksum;
cksump = &ra->next_rrd->header.drr_u.drr_checksum.drr_checksum;
if (ra->byteswap)
byteswap_record(&ra->next_rrd->header);
if ((!ZIO_CHECKSUM_IS_ZERO(cksump)) &&
!ZIO_CHECKSUM_EQUAL(ra->cksum, *cksump)) {
kmem_free(ra->next_rrd, sizeof (*ra->next_rrd));
ra->next_rrd = NULL;
return (SET_ERROR(ECKSUM));
}
receive_cksum(ra, sizeof (cksum_orig), &cksum_orig);
return (0);
}
/*
* Issue the prefetch reads for any necessary indirect blocks.
*
* We use the object ignore list to tell us whether or not to issue prefetches
* for a given object. We do this for both correctness (in case the blocksize
* of an object has changed) and performance (if the object doesn't exist, don't
* needlessly try to issue prefetches). We also trim the list as we go through
* the stream to prevent it from growing to an unbounded size.
*
* The object numbers within will always be in sorted order, and any write
* records we see will also be in sorted order, but they're not sorted with
* respect to each other (i.e. we can get several object records before
* receiving each object's write records). As a result, once we've reached a
* given object number, we can safely remove any reference to lower object
* numbers in the ignore list. In practice, we receive up to 32 object records
* before receiving write records, so the list can have up to 32 nodes in it.
*/
/* ARGSUSED */
static void
receive_read_prefetch(struct receive_arg *ra,
uint64_t object, uint64_t offset, uint64_t length)
{
struct receive_ign_obj_node *node = list_head(&ra->ignore_obj_list);
while (node != NULL && node->object < object) {
VERIFY3P(node, ==, list_remove_head(&ra->ignore_obj_list));
kmem_free(node, sizeof (*node));
node = list_head(&ra->ignore_obj_list);
}
if (node == NULL || node->object > object) {
dmu_prefetch(ra->os, object, 1, offset, length,
ZIO_PRIORITY_SYNC_READ);
}
}
/*
* Read records off the stream, issuing any necessary prefetches.
*/
static int
receive_read_record(struct receive_arg *ra)
{
int err;
switch (ra->rrd->header.drr_type) {
case DRR_OBJECT:
{
struct drr_object *drro = &ra->rrd->header.drr_u.drr_object;
uint32_t size = P2ROUNDUP(drro->drr_bonuslen, 8);
void *buf = kmem_zalloc(size, KM_SLEEP);
dmu_object_info_t doi;
err = receive_read_payload_and_next_header(ra, size, buf);
if (err != 0) {
kmem_free(buf, size);
return (err);
}
err = dmu_object_info(ra->os, drro->drr_object, &doi);
/*
* See receive_read_prefetch for an explanation why we're
* storing this object in the ignore_obj_list.
*/
if (err == ENOENT ||
(err == 0 && doi.doi_data_block_size != drro->drr_blksz)) {
struct receive_ign_obj_node *node =
kmem_zalloc(sizeof (*node),
KM_SLEEP);
node->object = drro->drr_object;
#ifdef ZFS_DEBUG
{
struct receive_ign_obj_node *last_object =
list_tail(&ra->ignore_obj_list);
uint64_t last_objnum = (last_object != NULL ?
last_object->object : 0);
ASSERT3U(node->object, >, last_objnum);
}
#endif
list_insert_tail(&ra->ignore_obj_list, node);
err = 0;
}
return (err);
}
case DRR_FREEOBJECTS:
{
err = receive_read_payload_and_next_header(ra, 0, NULL);
return (err);
}
case DRR_WRITE:
{
struct drr_write *drrw = &ra->rrd->header.drr_u.drr_write;
arc_buf_t *abuf = arc_loan_buf(dmu_objset_spa(ra->os),
drrw->drr_length);
err = receive_read_payload_and_next_header(ra,
drrw->drr_length, abuf->b_data);
if (err != 0) {
dmu_return_arcbuf(abuf);
return (err);
}
ra->rrd->write_buf = abuf;
receive_read_prefetch(ra, drrw->drr_object, drrw->drr_offset,
drrw->drr_length);
return (err);
}
case DRR_WRITE_BYREF:
{
struct drr_write_byref *drrwb =
&ra->rrd->header.drr_u.drr_write_byref;
err = receive_read_payload_and_next_header(ra, 0, NULL);
receive_read_prefetch(ra, drrwb->drr_object, drrwb->drr_offset,
drrwb->drr_length);
return (err);
}
case DRR_WRITE_EMBEDDED:
{
struct drr_write_embedded *drrwe =
&ra->rrd->header.drr_u.drr_write_embedded;
uint32_t size = P2ROUNDUP(drrwe->drr_psize, 8);
void *buf = kmem_zalloc(size, KM_SLEEP);
err = receive_read_payload_and_next_header(ra, size, buf);
if (err != 0) {
kmem_free(buf, size);
return (err);
}
receive_read_prefetch(ra, drrwe->drr_object, drrwe->drr_offset,
drrwe->drr_length);
return (err);
}
case DRR_FREE:
{
/*
* It might be beneficial to prefetch indirect blocks here, but
* we don't really have the data to decide for sure.
*/
err = receive_read_payload_and_next_header(ra, 0, NULL);
return (err);
}
case DRR_END:
{
struct drr_end *drre = &ra->rrd->header.drr_u.drr_end;
if (!ZIO_CHECKSUM_EQUAL(ra->prev_cksum, drre->drr_checksum))
return (SET_ERROR(EINVAL));
return (0);
}
case DRR_SPILL:
{
struct drr_spill *drrs = &ra->rrd->header.drr_u.drr_spill;
void *buf = kmem_zalloc(drrs->drr_length, KM_SLEEP);
err = receive_read_payload_and_next_header(ra, drrs->drr_length,
buf);
if (err != 0)
kmem_free(buf, drrs->drr_length);
return (err);
}
default:
return (SET_ERROR(EINVAL));
}
}
/*
* Commit the records to the pool.
*/
static int
receive_process_record(struct receive_writer_arg *rwa,
struct receive_record_arg *rrd)
{
int err;
switch (rrd->header.drr_type) {
case DRR_OBJECT:
{
struct drr_object *drro = &rrd->header.drr_u.drr_object;
err = receive_object(rwa, drro, rrd->payload);
kmem_free(rrd->payload, rrd->payload_size);
rrd->payload = NULL;
return (err);
}
case DRR_FREEOBJECTS:
{
struct drr_freeobjects *drrfo =
&rrd->header.drr_u.drr_freeobjects;
return (receive_freeobjects(rwa, drrfo));
}
case DRR_WRITE:
{
struct drr_write *drrw = &rrd->header.drr_u.drr_write;
err = receive_write(rwa, drrw, rrd->write_buf);
/* if receive_write() is successful, it consumes the arc_buf */
if (err != 0)
dmu_return_arcbuf(rrd->write_buf);
rrd->write_buf = NULL;
rrd->payload = NULL;
return (err);
}
case DRR_WRITE_BYREF:
{
struct drr_write_byref *drrwbr =
&rrd->header.drr_u.drr_write_byref;
return (receive_write_byref(rwa, drrwbr));
}
case DRR_WRITE_EMBEDDED:
{
struct drr_write_embedded *drrwe =
&rrd->header.drr_u.drr_write_embedded;
err = receive_write_embedded(rwa, drrwe, rrd->payload);
kmem_free(rrd->payload, rrd->payload_size);
rrd->payload = NULL;
return (err);
}
case DRR_FREE:
{
struct drr_free *drrf = &rrd->header.drr_u.drr_free;
return (receive_free(rwa, drrf));
}
case DRR_SPILL:
{
struct drr_spill *drrs = &rrd->header.drr_u.drr_spill;
err = receive_spill(rwa, drrs, rrd->payload);
kmem_free(rrd->payload, rrd->payload_size);
rrd->payload = NULL;
return (err);
}
default:
return (SET_ERROR(EINVAL));
}
}
/*
* dmu_recv_stream's worker thread; pull records off the queue, and then call
* receive_process_record When we're done, signal the main thread and exit.
*/
static void
receive_writer_thread(void *arg)
{
struct receive_writer_arg *rwa = arg;
struct receive_record_arg *rrd;
for (rrd = bqueue_dequeue(&rwa->q); !rrd->eos_marker;
rrd = bqueue_dequeue(&rwa->q)) {
/*
* If there's an error, the main thread will stop putting things
* on the queue, but we need to clear everything in it before we
* can exit.
*/
if (rwa->err == 0) {
rwa->err = receive_process_record(rwa, rrd);
} else if (rrd->write_buf != NULL) {
dmu_return_arcbuf(rrd->write_buf);
rrd->write_buf = NULL;
rrd->payload = NULL;
} else if (rrd->payload != NULL) {
kmem_free(rrd->payload, rrd->payload_size);
rrd->payload = NULL;
}
kmem_free(rrd, sizeof (*rrd));
}
kmem_free(rrd, sizeof (*rrd));
mutex_enter(&rwa->mutex);
rwa->done = B_TRUE;
cv_signal(&rwa->cv);
mutex_exit(&rwa->mutex);
}
/*
* Read in the stream's records, one by one, and apply them to the pool. There
* are two threads involved; the thread that calls this function will spin up a
* worker thread, read the records off the stream one by one, and issue
* prefetches for any necessary indirect blocks. It will then push the records
* onto an internal blocking queue. The worker thread will pull the records off
* the queue, and actually write the data into the DMU. This way, the worker
* thread doesn't have to wait for reads to complete, since everything it needs
* (the indirect blocks) will be prefetched.
*
* 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)
{
int err = 0;
struct receive_arg ra = { 0 };
struct receive_writer_arg rwa = { 0 };
int featureflags;
struct receive_ign_obj_node *n;
ra.byteswap = drc->drc_byteswap;
ra.cksum = drc->drc_cksum;
ra.vp = vp;
ra.voff = *voffp;
list_create(&ra.ignore_obj_list, sizeof (struct receive_ign_obj_node),
offsetof(struct receive_ign_obj_node, node));
/* 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, &ra.os));
ASSERT(dsl_dataset_phys(drc->drc_ds)->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) {
rwa.guid_to_ds_map =
kmem_alloc(sizeof (avl_tree_t), KM_SLEEP);
avl_create(rwa.guid_to_ds_map, guid_compare,
sizeof (guid_map_entry_t),
offsetof(guid_map_entry_t, avlnode));
err = zfs_onexit_add_cb(minor,
free_guid_map_onexit, rwa.guid_to_ds_map,
action_handlep);
if (ra.err != 0)
goto out;
} else {
err = zfs_onexit_cb_data(minor, *action_handlep,
(void **)&rwa.guid_to_ds_map);
if (ra.err != 0)
goto out;
}
drc->drc_guid_to_ds_map = rwa.guid_to_ds_map;
}
err = receive_read_payload_and_next_header(&ra, 0, NULL);
if (err)
goto out;
(void) bqueue_init(&rwa.q, zfs_recv_queue_length,
offsetof(struct receive_record_arg, node));
cv_init(&rwa.cv, NULL, CV_DEFAULT, NULL);
mutex_init(&rwa.mutex, NULL, MUTEX_DEFAULT, NULL);
rwa.os = ra.os;
rwa.byteswap = drc->drc_byteswap;
(void) thread_create(NULL, 0, receive_writer_thread, &rwa, 0, curproc,
TS_RUN, minclsyspri);
/*
* We're reading rwa.err without locks, which is safe since we are the
* only reader, and the worker thread is the only writer. It's ok if we
* miss a write for an iteration or two of the loop, since the writer
* thread will keep freeing records we send it until we send it an eos
* marker.
*
* We can leave this loop in 3 ways: First, if rwa.err is
* non-zero. In that case, the writer thread will free the rrd we just
* pushed. Second, if we're interrupted; in that case, either it's the
* first loop and ra.rrd was never allocated, or it's later, and ra.rrd
* has been handed off to the writer thread who will free it. Finally,
* if receive_read_record fails or we're at the end of the stream, then
* we free ra.rrd and exit.
*/
while (rwa.err == 0) {
if (issig(JUSTLOOKING) && issig(FORREAL)) {
err = SET_ERROR(EINTR);
break;
}
ASSERT3P(ra.rrd, ==, NULL);
ra.rrd = ra.next_rrd;
ra.next_rrd = NULL;
/* Allocates and loads header into ra.next_rrd */
err = receive_read_record(&ra);
if (ra.rrd->header.drr_type == DRR_END || err != 0) {
kmem_free(ra.rrd, sizeof (*ra.rrd));
ra.rrd = NULL;
break;
}
bqueue_enqueue(&rwa.q, ra.rrd,
sizeof (struct receive_record_arg) + ra.rrd->payload_size);
ra.rrd = NULL;
}
if (ra.next_rrd == NULL)
ra.next_rrd = kmem_zalloc(sizeof (*ra.next_rrd), KM_SLEEP);
ra.next_rrd->eos_marker = B_TRUE;
bqueue_enqueue(&rwa.q, ra.next_rrd, 1);
mutex_enter(&rwa.mutex);
while (!rwa.done) {
cv_wait(&rwa.cv, &rwa.mutex);
}
mutex_exit(&rwa.mutex);
cv_destroy(&rwa.cv);
mutex_destroy(&rwa.mutex);
bqueue_destroy(&rwa.q);
if (err == 0)
err = rwa.err;
out:
if ((featureflags & DMU_BACKUP_FEATURE_DEDUP) && (cleanup_fd != -1))
zfs_onexit_fd_rele(cleanup_fd);
if (err != 0) {
/*
* destroy what we created, so we don't leave it in the
* inconsistent restoring state.
*/
dmu_recv_cleanup_ds(drc);
}
*voffp = ra.voff;
for (n = list_remove_head(&ra.ignore_obj_list); n != NULL;
n = list_remove_head(&ra.ignore_obj_list)) {
kmem_free(n, sizeof (*n));
}
list_destroy(&ra.ignore_obj_list);
return (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;
obj = dsl_dataset_phys(origin_head)->ds_prev_snap_obj;
while (obj !=
dsl_dataset_phys(drc->drc_ds)->ds_prev_snap_obj) {
dsl_dataset_t *snap;
error = dsl_dataset_hold_obj(dp, obj, FTAG,
&snap);
if (error != 0)
break;
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 = dsl_dataset_phys(snap)->ds_prev_snap_obj;
dsl_dataset_rele(snap, FTAG);
if (error != 0)
break;
}
if (error != 0) {
dsl_dataset_rele(origin_head, FTAG);
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;
obj = dsl_dataset_phys(origin_head)->ds_prev_snap_obj;
while (obj !=
dsl_dataset_phys(drc->drc_ds)->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 = dsl_dataset_phys(snap)->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);
dsl_dataset_phys(origin_head->ds_prev)->ds_creation_time =
drc->drc_drrb->drr_creation_time;
dsl_dataset_phys(origin_head->ds_prev)->ds_guid =
drc->drc_drrb->drr_toguid;
dsl_dataset_phys(origin_head->ds_prev)->ds_flags &=
~DS_FLAG_INCONSISTENT;
dmu_buf_will_dirty(origin_head->ds_dbuf, tx);
dsl_dataset_phys(origin_head)->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);
dsl_dataset_phys(ds->ds_prev)->ds_creation_time =
drc->drc_drrb->drr_creation_time;
dsl_dataset_phys(ds->ds_prev)->ds_guid =
drc->drc_drrb->drr_toguid;
dsl_dataset_phys(ds->ds_prev)->ds_flags &=
~DS_FLAG_INCONSISTENT;
dmu_buf_will_dirty(ds->ds_dbuf, tx);
dsl_dataset_phys(ds)->ds_flags &= ~DS_FLAG_INCONSISTENT;
}
drc->drc_newsnapobj = dsl_dataset_phys(drc->drc_ds)->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 = dsl_dataset_phys(snapds)->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, ZFS_SPACE_CHECK_NORMAL);
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, ZFS_SPACE_CHECK_NORMAL);
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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