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mirror_zfs/module/zfs/dmu_recv.c
Matthew Ahrens ba67d82142
Improve zfs receive performance with lightweight write 
The performance of `zfs receive` can be bottlenecked on the CPU consumed
by the `receive_writer` thread, especially when receiving streams with
small compressed block sizes.  Much of the CPU is spent creating and
destroying dbuf's and arc buf's, one for each `WRITE` record in the send
stream.

This commit introduces the concept of "lightweight writes", which allows
`zfs receive` to write to the DMU by providing an ABD, and instantiating
only a new type of `dbuf_dirty_record_t`.  The dbuf and arc buf for this
"dirty leaf block" are not instantiated.

Because there is no dbuf with the dirty data, this mechanism doesn't
support reading from "lightweight-dirty" blocks (they would see the
on-disk state rather than the dirty data).  Since the dedup-receive code
has been removed, `zfs receive` is write-only, so this works fine.

Because there are no arc bufs for the received data, the received data
is no longer cached in the ARC.

Testing a receive of a stream with average compressed block size of 4KB,
this commit improves performance by 50%, while also reducing CPU usage
by 50% of a CPU.  On a per-block basis, CPU consumed by receive_writer()
and dbuf_evict() is now 1/7th (14%) of what it was.

Baseline: 450MB/s, CPU in receive_writer() 40% + dbuf_evict() 35%
New: 670MB/s, CPU in receive_writer() 17% + dbuf_evict() 0%

The code is also restructured in a few ways:

Added a `dr_dnode` field to the dbuf_dirty_record_t.  This simplifies
some existing code that no longer needs `DB_DNODE_ENTER()` and related
routines.  The new field is needed by the lightweight-type dirty record.

To ensure that the `dr_dnode` field remains valid until the dirty record
is freed, we have to ensure that the `dnode_move()` doesn't relocate the
dnode_t.  To do this we keep a hold on the dnode until it's zio's have
completed.  This is already done by the user-accounting code
(`userquota_updates_task()`), this commit extends that so that it always
keeps the dnode hold until zio completion (see `dnode_rele_task()`).

`dn_dirty_txg` was previously zeroed when the dnode was synced.  This
was not necessary, since its meaning can be "when was this dnode last
dirtied".  This change simplifies the new `dnode_rele_task()` code.

Removed some dead code related to `DRR_WRITE_BYREF` (dedup receive).

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Paul Dagnelie <pcd@delphix.com>
Reviewed-by: George Wilson <gwilson@delphix.com>
Signed-off-by: Matthew Ahrens <mahrens@delphix.com>
Closes #11105
2020-12-11 10:26:02 -08:00

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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 2011 Nexenta Systems, Inc. All rights reserved.
* Copyright (c) 2011, 2020 by Delphix. All rights reserved.
* Copyright (c) 2014, Joyent, Inc. All rights reserved.
* Copyright 2014 HybridCluster. All rights reserved.
* Copyright (c) 2018, loli10K <ezomori.nozomu@gmail.com>. All rights reserved.
* Copyright (c) 2019, Klara Inc.
* Copyright (c) 2019, Allan Jude
*/
#include <sys/dmu.h>
#include <sys/dmu_impl.h>
#include <sys/dmu_send.h>
#include <sys/dmu_recv.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/zfs_ioctl.h>
#include <sys/zap.h>
#include <sys/zvol.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>
#include <sys/objlist.h>
#ifdef _KERNEL
#include <sys/zfs_vfsops.h>
#endif
#include <sys/zfs_file.h>
int zfs_recv_queue_length = SPA_MAXBLOCKSIZE;
int zfs_recv_queue_ff = 20;
int zfs_recv_write_batch_size = 1024 * 1024;
static char *dmu_recv_tag = "dmu_recv_tag";
const char *recv_clone_name = "%recv";
static int receive_read_payload_and_next_header(dmu_recv_cookie_t *ra, int len,
void *buf);
struct receive_record_arg {
dmu_replay_record_t header;
void *payload; /* Pointer to a buffer containing the payload */
/*
* If the record is a WRITE or SPILL, pointer to the abd containing the
* payload.
*/
abd_t *abd;
int payload_size;
uint64_t bytes_read; /* bytes read from stream when record created */
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 members are used to signal to the main thread when
* we're done.
*/
kmutex_t mutex;
kcondvar_t cv;
boolean_t done;
int err;
boolean_t resumable;
boolean_t raw; /* DMU_BACKUP_FEATURE_RAW set */
boolean_t spill; /* DRR_FLAG_SPILL_BLOCK set */
boolean_t full; /* this is a full send stream */
uint64_t last_object;
uint64_t last_offset;
uint64_t max_object; /* highest object ID referenced in stream */
uint64_t bytes_read; /* bytes read when current record created */
list_t write_batch;
/* Encryption parameters for the last received DRR_OBJECT_RANGE */
boolean_t or_crypt_params_present;
uint64_t or_firstobj;
uint64_t or_numslots;
uint8_t or_salt[ZIO_DATA_SALT_LEN];
uint8_t or_iv[ZIO_DATA_IV_LEN];
uint8_t or_mac[ZIO_DATA_MAC_LEN];
boolean_t or_byteorder;
};
typedef struct dmu_recv_begin_arg {
const char *drba_origin;
dmu_recv_cookie_t *drba_cookie;
cred_t *drba_cred;
proc_t *drba_proc;
dsl_crypto_params_t *drba_dcp;
} dmu_recv_begin_arg_t;
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);
DO32(drr_object.drr_raw_bonuslen);
DO64(drr_object.drr_toguid);
DO64(drr_object.drr_maxblkid);
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_logical_size);
DO64(drr_write.drr_toguid);
ZIO_CHECKSUM_BSWAP(&drr->drr_u.drr_write.drr_key.ddk_cksum);
DO64(drr_write.drr_key.ddk_prop);
DO64(drr_write.drr_compressed_size);
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);
DO64(drr_spill.drr_compressed_size);
DO32(drr_spill.drr_type);
break;
case DRR_OBJECT_RANGE:
DO64(drr_object_range.drr_firstobj);
DO64(drr_object_range.drr_numslots);
DO64(drr_object_range.drr_toguid);
break;
case DRR_REDACT:
DO64(drr_redact.drr_object);
DO64(drr_redact.drr_offset);
DO64(drr_redact.drr_length);
DO64(drr_redact.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 boolean_t
redact_snaps_contains(uint64_t *snaps, uint64_t num_snaps, uint64_t guid)
{
for (int i = 0; i < num_snaps; i++) {
if (snaps[i] == guid)
return (B_TRUE);
}
return (B_FALSE);
}
/*
* Check that the new stream we're trying to receive is redacted with respect to
* a subset of the snapshots that the origin was redacted with respect to. For
* the reasons behind this, see the man page on redacted zfs sends and receives.
*/
static boolean_t
compatible_redact_snaps(uint64_t *origin_snaps, uint64_t origin_num_snaps,
uint64_t *redact_snaps, uint64_t num_redact_snaps)
{
/*
* Short circuit the comparison; if we are redacted with respect to
* more snapshots than the origin, we can't be redacted with respect
* to a subset.
*/
if (num_redact_snaps > origin_num_snaps) {
return (B_FALSE);
}
for (int i = 0; i < num_redact_snaps; i++) {
if (!redact_snaps_contains(origin_snaps, origin_num_snaps,
redact_snaps[i])) {
return (B_FALSE);
}
}
return (B_TRUE);
}
static boolean_t
redact_check(dmu_recv_begin_arg_t *drba, dsl_dataset_t *origin)
{
uint64_t *origin_snaps;
uint64_t origin_num_snaps;
dmu_recv_cookie_t *drc = drba->drba_cookie;
struct drr_begin *drrb = drc->drc_drrb;
int featureflags = DMU_GET_FEATUREFLAGS(drrb->drr_versioninfo);
int err = 0;
boolean_t ret = B_TRUE;
uint64_t *redact_snaps;
uint_t numredactsnaps;
/*
* If this is a full send stream, we're safe no matter what.
*/
if (drrb->drr_fromguid == 0)
return (ret);
VERIFY(dsl_dataset_get_uint64_array_feature(origin,
SPA_FEATURE_REDACTED_DATASETS, &origin_num_snaps, &origin_snaps));
if (nvlist_lookup_uint64_array(drc->drc_begin_nvl,
BEGINNV_REDACT_FROM_SNAPS, &redact_snaps, &numredactsnaps) ==
0) {
/*
* If the send stream was sent from the redaction bookmark or
* the redacted version of the dataset, then we're safe. Verify
* that this is from the a compatible redaction bookmark or
* redacted dataset.
*/
if (!compatible_redact_snaps(origin_snaps, origin_num_snaps,
redact_snaps, numredactsnaps)) {
err = EINVAL;
}
} else if (featureflags & DMU_BACKUP_FEATURE_REDACTED) {
/*
* If the stream is redacted, it must be redacted with respect
* to a subset of what the origin is redacted with respect to.
* See case number 2 in the zfs man page section on redacted zfs
* send.
*/
err = nvlist_lookup_uint64_array(drc->drc_begin_nvl,
BEGINNV_REDACT_SNAPS, &redact_snaps, &numredactsnaps);
if (err != 0 || !compatible_redact_snaps(origin_snaps,
origin_num_snaps, redact_snaps, numredactsnaps)) {
err = EINVAL;
}
} else if (!redact_snaps_contains(origin_snaps, origin_num_snaps,
drrb->drr_toguid)) {
/*
* If the stream isn't redacted but the origin is, this must be
* one of the snapshots the origin is redacted with respect to.
* See case number 1 in the zfs man page section on redacted zfs
* send.
*/
err = EINVAL;
}
if (err != 0)
ret = B_FALSE;
return (ret);
}
/*
* If we previously received a stream with --large-block, we don't support
* receiving an incremental on top of it without --large-block. This avoids
* forcing a read-modify-write or trying to re-aggregate a string of WRITE
* records.
*/
static int
recv_check_large_blocks(dsl_dataset_t *ds, uint64_t featureflags)
{
if (dsl_dataset_feature_is_active(ds, SPA_FEATURE_LARGE_BLOCKS) &&
!(featureflags & DMU_BACKUP_FEATURE_LARGE_BLOCKS))
return (SET_ERROR(ZFS_ERR_STREAM_LARGE_BLOCK_MISMATCH));
return (0);
}
static int
recv_begin_check_existing_impl(dmu_recv_begin_arg_t *drba, dsl_dataset_t *ds,
uint64_t fromguid, uint64_t featureflags)
{
uint64_t val;
uint64_t children;
int error;
dsl_pool_t *dp = ds->ds_dir->dd_pool;
boolean_t encrypted = ds->ds_dir->dd_crypto_obj != 0;
boolean_t raw = (featureflags & DMU_BACKUP_FEATURE_RAW) != 0;
boolean_t embed = (featureflags & DMU_BACKUP_FEATURE_EMBED_DATA) != 0;
/* 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 ? SET_ERROR(EBUSY) : error);
/* Resume state must not be set. */
if (dsl_dataset_has_resume_receive_state(ds))
return (SET_ERROR(EBUSY));
/* 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 ? SET_ERROR(EEXIST) : error);
/* Must not have children if receiving a ZVOL. */
error = zap_count(dp->dp_meta_objset,
dsl_dir_phys(ds->ds_dir)->dd_child_dir_zapobj, &children);
if (error != 0)
return (error);
if (drba->drba_cookie->drc_drrb->drr_type != DMU_OST_ZFS &&
children > 0)
return (SET_ERROR(ZFS_ERR_WRONG_PARENT));
/*
* 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, drba->drba_proc);
if (error != 0)
return (error);
if (fromguid != 0) {
dsl_dataset_t *snap;
uint64_t obj = dsl_dataset_phys(ds)->ds_prev_snap_obj;
/* Can't perform a raw receive on top of a non-raw receive */
if (!encrypted && raw)
return (SET_ERROR(EINVAL));
/* Encryption is incompatible with embedded data */
if (encrypted && embed)
return (SET_ERROR(EINVAL));
/* 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_cookie->drc_fromsnapobj = obj;
} else {
/*
* If we are not forcing, there must be no
* changes since fromsnap. Raw sends have an
* additional constraint that requires that
* no "noop" snapshots exist between fromsnap
* and tosnap for the IVset checking code to
* work properly.
*/
if (dsl_dataset_modified_since_snap(ds, snap) ||
(raw &&
dsl_dataset_phys(ds)->ds_prev_snap_obj !=
snap->ds_object)) {
dsl_dataset_rele(snap, FTAG);
return (SET_ERROR(ETXTBSY));
}
drba->drba_cookie->drc_fromsnapobj =
ds->ds_prev->ds_object;
}
if (dsl_dataset_feature_is_active(snap,
SPA_FEATURE_REDACTED_DATASETS) && !redact_check(drba,
snap)) {
dsl_dataset_rele(snap, FTAG);
return (SET_ERROR(EINVAL));
}
error = recv_check_large_blocks(snap, featureflags);
if (error != 0) {
dsl_dataset_rele(snap, FTAG);
return (error);
}
dsl_dataset_rele(snap, FTAG);
} else {
/* if full, then must be forced */
if (!drba->drba_cookie->drc_force)
return (SET_ERROR(EEXIST));
/*
* We don't support using zfs recv -F to blow away
* encrypted filesystems. This would require the
* dsl dir to point to the old encryption key and
* the new one at the same time during the receive.
*/
if ((!encrypted && raw) || encrypted)
return (SET_ERROR(EINVAL));
/*
* Perform the same encryption checks we would if
* we were creating a new dataset from scratch.
*/
if (!raw) {
boolean_t will_encrypt;
error = dmu_objset_create_crypt_check(
ds->ds_dir->dd_parent, drba->drba_dcp,
&will_encrypt);
if (error != 0)
return (error);
if (will_encrypt && embed)
return (SET_ERROR(EINVAL));
}
}
return (0);
}
/*
* Check that any feature flags used in the data stream we're receiving are
* supported by the pool we are receiving into.
*
* Note that some of the features we explicitly check here have additional
* (implicit) features they depend on, but those dependencies are enforced
* through the zfeature_register() calls declaring the features that we
* explicitly check.
*/
static int
recv_begin_check_feature_flags_impl(uint64_t featureflags, spa_t *spa)
{
/*
* Check if there are any unsupported feature flags.
*/
if (!DMU_STREAM_SUPPORTED(featureflags)) {
return (SET_ERROR(ZFS_ERR_UNKNOWN_SEND_STREAM_FEATURE));
}
/* Verify pool version supports SA if SA_SPILL feature set */
if ((featureflags & DMU_BACKUP_FEATURE_SA_SPILL) &&
spa_version(spa) < SPA_VERSION_SA)
return (SET_ERROR(ENOTSUP));
/*
* LZ4 compressed, ZSTD compressed, embedded, mooched, large blocks,
* and large_dnodes in the stream can only be used if those pool
* features are enabled because we don't attempt to decompress /
* un-embed / un-mooch / split up the blocks / dnodes during the
* receive process.
*/
if ((featureflags & DMU_BACKUP_FEATURE_LZ4) &&
!spa_feature_is_enabled(spa, SPA_FEATURE_LZ4_COMPRESS))
return (SET_ERROR(ENOTSUP));
if ((featureflags & DMU_BACKUP_FEATURE_ZSTD) &&
!spa_feature_is_enabled(spa, SPA_FEATURE_ZSTD_COMPRESS))
return (SET_ERROR(ENOTSUP));
if ((featureflags & DMU_BACKUP_FEATURE_EMBED_DATA) &&
!spa_feature_is_enabled(spa, SPA_FEATURE_EMBEDDED_DATA))
return (SET_ERROR(ENOTSUP));
if ((featureflags & DMU_BACKUP_FEATURE_LARGE_BLOCKS) &&
!spa_feature_is_enabled(spa, SPA_FEATURE_LARGE_BLOCKS))
return (SET_ERROR(ENOTSUP));
if ((featureflags & DMU_BACKUP_FEATURE_LARGE_DNODE) &&
!spa_feature_is_enabled(spa, SPA_FEATURE_LARGE_DNODE))
return (SET_ERROR(ENOTSUP));
/*
* Receiving redacted streams requires that redacted datasets are
* enabled.
*/
if ((featureflags & DMU_BACKUP_FEATURE_REDACTED) &&
!spa_feature_is_enabled(spa, SPA_FEATURE_REDACTED_DATASETS))
return (SET_ERROR(ENOTSUP));
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;
ds_hold_flags_t dsflags = 0;
int error;
uint64_t featureflags = drba->drba_cookie->drc_featureflags;
dsl_dataset_t *ds;
const char *tofs = drba->drba_cookie->drc_tofs;
/* already checked */
ASSERT3U(drrb->drr_magic, ==, DMU_BACKUP_MAGIC);
ASSERT(!(featureflags & DMU_BACKUP_FEATURE_RESUMING));
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));
error = recv_begin_check_feature_flags_impl(featureflags, dp->dp_spa);
if (error != 0)
return (error);
/* Resumable receives require extensible datasets */
if (drba->drba_cookie->drc_resumable &&
!spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_EXTENSIBLE_DATASET))
return (SET_ERROR(ENOTSUP));
if (featureflags & DMU_BACKUP_FEATURE_RAW) {
/* raw receives require the encryption feature */
if (!spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_ENCRYPTION))
return (SET_ERROR(ENOTSUP));
/* embedded data is incompatible with encryption and raw recv */
if (featureflags & DMU_BACKUP_FEATURE_EMBED_DATA)
return (SET_ERROR(EINVAL));
/* raw receives require spill block allocation flag */
if (!(flags & DRR_FLAG_SPILL_BLOCK))
return (SET_ERROR(ZFS_ERR_SPILL_BLOCK_FLAG_MISSING));
} else {
dsflags |= DS_HOLD_FLAG_DECRYPT;
}
error = dsl_dataset_hold_flags(dp, tofs, dsflags, 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 || drba->drba_origin) {
dsl_dataset_rele_flags(ds, dsflags, FTAG);
return (SET_ERROR(EINVAL));
}
error = recv_begin_check_existing_impl(drba, ds, fromguid,
featureflags);
dsl_dataset_rele_flags(ds, dsflags, FTAG);
} else if (error == ENOENT) {
/* target fs does not exist; must be a full backup or clone */
char buf[ZFS_MAX_DATASET_NAME_LEN];
objset_t *os;
/*
* 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));
/*
* If we're receiving a full send as a clone, and it doesn't
* contain all the necessary free records and freeobject
* records, reject it.
*/
if (fromguid == 0 && drba->drba_origin != NULL &&
!(flags & DRR_FLAG_FREERECORDS))
return (SET_ERROR(EINVAL));
/* Open the parent of tofs */
ASSERT3U(strlen(tofs), <, sizeof (buf));
(void) strlcpy(buf, tofs, strrchr(tofs, '/') - tofs + 1);
error = dsl_dataset_hold(dp, buf, FTAG, &ds);
if (error != 0)
return (error);
if ((featureflags & DMU_BACKUP_FEATURE_RAW) == 0 &&
drba->drba_origin == NULL) {
boolean_t will_encrypt;
/*
* Check that we aren't breaking any encryption rules
* and that we have all the parameters we need to
* create an encrypted dataset if necessary. If we are
* making an encrypted dataset the stream can't have
* embedded data.
*/
error = dmu_objset_create_crypt_check(ds->ds_dir,
drba->drba_dcp, &will_encrypt);
if (error != 0) {
dsl_dataset_rele(ds, FTAG);
return (error);
}
if (will_encrypt &&
(featureflags & DMU_BACKUP_FEATURE_EMBED_DATA)) {
dsl_dataset_rele(ds, FTAG);
return (SET_ERROR(EINVAL));
}
}
/*
* 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, drba->drba_proc);
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, drba->drba_proc);
if (error != 0) {
dsl_dataset_rele(ds, FTAG);
return (error);
}
/* can't recv below anything but filesystems (eg. no ZVOLs) */
error = dmu_objset_from_ds(ds, &os);
if (error != 0) {
dsl_dataset_rele(ds, FTAG);
return (error);
}
if (dmu_objset_type(os) != DMU_OST_ZFS) {
dsl_dataset_rele(ds, FTAG);
return (SET_ERROR(ZFS_ERR_WRONG_PARENT));
}
if (drba->drba_origin != NULL) {
dsl_dataset_t *origin;
error = dsl_dataset_hold_flags(dp, drba->drba_origin,
dsflags, FTAG, &origin);
if (error != 0) {
dsl_dataset_rele(ds, FTAG);
return (error);
}
if (!origin->ds_is_snapshot) {
dsl_dataset_rele_flags(origin, dsflags, FTAG);
dsl_dataset_rele(ds, FTAG);
return (SET_ERROR(EINVAL));
}
if (dsl_dataset_phys(origin)->ds_guid != fromguid &&
fromguid != 0) {
dsl_dataset_rele_flags(origin, dsflags, FTAG);
dsl_dataset_rele(ds, FTAG);
return (SET_ERROR(ENODEV));
}
if (origin->ds_dir->dd_crypto_obj != 0 &&
(featureflags & DMU_BACKUP_FEATURE_EMBED_DATA)) {
dsl_dataset_rele_flags(origin, dsflags, FTAG);
dsl_dataset_rele(ds, FTAG);
return (SET_ERROR(EINVAL));
}
/*
* If the origin is redacted we need to verify that this
* send stream can safely be received on top of the
* origin.
*/
if (dsl_dataset_feature_is_active(origin,
SPA_FEATURE_REDACTED_DATASETS)) {
if (!redact_check(drba, origin)) {
dsl_dataset_rele_flags(origin, dsflags,
FTAG);
dsl_dataset_rele_flags(ds, dsflags,
FTAG);
return (SET_ERROR(EINVAL));
}
}
error = recv_check_large_blocks(ds, featureflags);
if (error != 0) {
dsl_dataset_rele_flags(origin, dsflags, FTAG);
dsl_dataset_rele_flags(ds, dsflags, FTAG);
return (error);
}
dsl_dataset_rele_flags(origin, dsflags, 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);
objset_t *mos = dp->dp_meta_objset;
dmu_recv_cookie_t *drc = drba->drba_cookie;
struct drr_begin *drrb = drc->drc_drrb;
const char *tofs = drc->drc_tofs;
uint64_t featureflags = drc->drc_featureflags;
dsl_dataset_t *ds, *newds;
objset_t *os;
uint64_t dsobj;
ds_hold_flags_t dsflags = 0;
int error;
uint64_t crflags = 0;
dsl_crypto_params_t dummy_dcp = { 0 };
dsl_crypto_params_t *dcp = drba->drba_dcp;
if (drrb->drr_flags & DRR_FLAG_CI_DATA)
crflags |= DS_FLAG_CI_DATASET;
if ((featureflags & DMU_BACKUP_FEATURE_RAW) == 0)
dsflags |= DS_HOLD_FLAG_DECRYPT;
/*
* Raw, non-incremental recvs always use a dummy dcp with
* the raw cmd set. Raw incremental recvs do not use a dcp
* since the encryption parameters are already set in stone.
*/
if (dcp == NULL && drrb->drr_fromguid == 0 &&
drba->drba_origin == NULL) {
ASSERT3P(dcp, ==, NULL);
dcp = &dummy_dcp;
if (featureflags & DMU_BACKUP_FEATURE_RAW)
dcp->cp_cmd = DCP_CMD_RAW_RECV;
}
error = dsl_dataset_hold_flags(dp, tofs, dsflags, FTAG, &ds);
if (error == 0) {
/* create temporary clone */
dsl_dataset_t *snap = NULL;
if (drba->drba_cookie->drc_fromsnapobj != 0) {
VERIFY0(dsl_dataset_hold_obj(dp,
drba->drba_cookie->drc_fromsnapobj, FTAG, &snap));
ASSERT3P(dcp, ==, NULL);
}
dsobj = dsl_dataset_create_sync(ds->ds_dir, recv_clone_name,
snap, crflags, drba->drba_cred, dcp, tx);
if (drba->drba_cookie->drc_fromsnapobj != 0)
dsl_dataset_rele(snap, FTAG);
dsl_dataset_rele_flags(ds, dsflags, 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));
ASSERT3P(dcp, ==, NULL);
}
/* Create new dataset. */
dsobj = dsl_dataset_create_sync(dd, strrchr(tofs, '/') + 1,
origin, crflags, drba->drba_cred, dcp, tx);
if (origin != NULL)
dsl_dataset_rele(origin, FTAG);
dsl_dir_rele(dd, FTAG);
drc->drc_newfs = B_TRUE;
}
VERIFY0(dsl_dataset_own_obj_force(dp, dsobj, dsflags, dmu_recv_tag,
&newds));
if (dsl_dataset_feature_is_active(newds,
SPA_FEATURE_REDACTED_DATASETS)) {
/*
* If the origin dataset is redacted, the child will be redacted
* when we create it. We clear the new dataset's
* redaction info; if it should be redacted, we'll fill
* in its information later.
*/
dsl_dataset_deactivate_feature(newds,
SPA_FEATURE_REDACTED_DATASETS, tx);
}
VERIFY0(dmu_objset_from_ds(newds, &os));
if (drc->drc_resumable) {
dsl_dataset_zapify(newds, tx);
if (drrb->drr_fromguid != 0) {
VERIFY0(zap_add(mos, dsobj, DS_FIELD_RESUME_FROMGUID,
8, 1, &drrb->drr_fromguid, tx));
}
VERIFY0(zap_add(mos, dsobj, DS_FIELD_RESUME_TOGUID,
8, 1, &drrb->drr_toguid, tx));
VERIFY0(zap_add(mos, dsobj, DS_FIELD_RESUME_TONAME,
1, strlen(drrb->drr_toname) + 1, drrb->drr_toname, tx));
uint64_t one = 1;
uint64_t zero = 0;
VERIFY0(zap_add(mos, dsobj, DS_FIELD_RESUME_OBJECT,
8, 1, &one, tx));
VERIFY0(zap_add(mos, dsobj, DS_FIELD_RESUME_OFFSET,
8, 1, &zero, tx));
VERIFY0(zap_add(mos, dsobj, DS_FIELD_RESUME_BYTES,
8, 1, &zero, tx));
if (featureflags & DMU_BACKUP_FEATURE_LARGE_BLOCKS) {
VERIFY0(zap_add(mos, dsobj, DS_FIELD_RESUME_LARGEBLOCK,
8, 1, &one, tx));
}
if (featureflags & DMU_BACKUP_FEATURE_EMBED_DATA) {
VERIFY0(zap_add(mos, dsobj, DS_FIELD_RESUME_EMBEDOK,
8, 1, &one, tx));
}
if (featureflags & DMU_BACKUP_FEATURE_COMPRESSED) {
VERIFY0(zap_add(mos, dsobj, DS_FIELD_RESUME_COMPRESSOK,
8, 1, &one, tx));
}
if (featureflags & DMU_BACKUP_FEATURE_RAW) {
VERIFY0(zap_add(mos, dsobj, DS_FIELD_RESUME_RAWOK,
8, 1, &one, tx));
}
uint64_t *redact_snaps;
uint_t numredactsnaps;
if (nvlist_lookup_uint64_array(drc->drc_begin_nvl,
BEGINNV_REDACT_FROM_SNAPS, &redact_snaps,
&numredactsnaps) == 0) {
VERIFY0(zap_add(mos, dsobj,
DS_FIELD_RESUME_REDACT_BOOKMARK_SNAPS,
sizeof (*redact_snaps), numredactsnaps,
redact_snaps, tx));
}
}
/*
* Usually the os->os_encrypted value is tied to the presence of a
* DSL Crypto Key object in the dd. However, that will not be received
* until dmu_recv_stream(), so we set the value manually for now.
*/
if (featureflags & DMU_BACKUP_FEATURE_RAW) {
os->os_encrypted = B_TRUE;
drba->drba_cookie->drc_raw = B_TRUE;
}
if (featureflags & DMU_BACKUP_FEATURE_REDACTED) {
uint64_t *redact_snaps;
uint_t numredactsnaps;
VERIFY0(nvlist_lookup_uint64_array(drc->drc_begin_nvl,
BEGINNV_REDACT_SNAPS, &redact_snaps, &numredactsnaps));
dsl_dataset_activate_redaction(newds, redact_snaps,
numredactsnaps, tx);
}
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 this is a raw send we postpone this until
* dmu_recv_stream() so that we can allocate the metadnode with the
* properties from the DRR_BEGIN payload.
*/
rrw_enter(&newds->ds_bp_rwlock, RW_READER, FTAG);
if (BP_IS_HOLE(dsl_dataset_get_blkptr(newds)) &&
(featureflags & DMU_BACKUP_FEATURE_RAW) == 0) {
(void) dmu_objset_create_impl(dp->dp_spa,
newds, dsl_dataset_get_blkptr(newds), drrb->drr_type, tx);
}
rrw_exit(&newds->ds_bp_rwlock, FTAG);
drba->drba_cookie->drc_ds = newds;
drba->drba_cookie->drc_os = os;
spa_history_log_internal_ds(newds, "receive", tx, " ");
}
static int
dmu_recv_resume_begin_check(void *arg, dmu_tx_t *tx)
{
dmu_recv_begin_arg_t *drba = arg;
dmu_recv_cookie_t *drc = drba->drba_cookie;
dsl_pool_t *dp = dmu_tx_pool(tx);
struct drr_begin *drrb = drc->drc_drrb;
int error;
ds_hold_flags_t dsflags = 0;
dsl_dataset_t *ds;
const char *tofs = drc->drc_tofs;
/* already checked */
ASSERT3U(drrb->drr_magic, ==, DMU_BACKUP_MAGIC);
ASSERT(drc->drc_featureflags & DMU_BACKUP_FEATURE_RESUMING);
if (DMU_GET_STREAM_HDRTYPE(drrb->drr_versioninfo) ==
DMU_COMPOUNDSTREAM ||
drrb->drr_type >= DMU_OST_NUMTYPES)
return (SET_ERROR(EINVAL));
/*
* This is mostly a sanity check since we should have already done these
* checks during a previous attempt to receive the data.
*/
error = recv_begin_check_feature_flags_impl(drc->drc_featureflags,
dp->dp_spa);
if (error != 0)
return (error);
/* 6 extra bytes for /%recv */
char recvname[ZFS_MAX_DATASET_NAME_LEN + 6];
(void) snprintf(recvname, sizeof (recvname), "%s/%s",
tofs, recv_clone_name);
if (drc->drc_featureflags & DMU_BACKUP_FEATURE_RAW) {
/* raw receives require spill block allocation flag */
if (!(drrb->drr_flags & DRR_FLAG_SPILL_BLOCK))
return (SET_ERROR(ZFS_ERR_SPILL_BLOCK_FLAG_MISSING));
} else {
dsflags |= DS_HOLD_FLAG_DECRYPT;
}
if (dsl_dataset_hold_flags(dp, recvname, dsflags, FTAG, &ds) != 0) {
/* %recv does not exist; continue in tofs */
error = dsl_dataset_hold_flags(dp, tofs, dsflags, FTAG, &ds);
if (error != 0)
return (error);
}
/* check that ds is marked inconsistent */
if (!DS_IS_INCONSISTENT(ds)) {
dsl_dataset_rele_flags(ds, dsflags, FTAG);
return (SET_ERROR(EINVAL));
}
/* check that there is resuming data, and that the toguid matches */
if (!dsl_dataset_is_zapified(ds)) {
dsl_dataset_rele_flags(ds, dsflags, FTAG);
return (SET_ERROR(EINVAL));
}
uint64_t val;
error = zap_lookup(dp->dp_meta_objset, ds->ds_object,
DS_FIELD_RESUME_TOGUID, sizeof (val), 1, &val);
if (error != 0 || drrb->drr_toguid != val) {
dsl_dataset_rele_flags(ds, dsflags, FTAG);
return (SET_ERROR(EINVAL));
}
/*
* Check if the receive is still running. If so, it will be owned.
* Note that nothing else can own the dataset (e.g. after the receive
* fails) because it will be marked inconsistent.
*/
if (dsl_dataset_has_owner(ds)) {
dsl_dataset_rele_flags(ds, dsflags, FTAG);
return (SET_ERROR(EBUSY));
}
/* There should not be any snapshots of this fs yet. */
if (ds->ds_prev != NULL && ds->ds_prev->ds_dir == ds->ds_dir) {
dsl_dataset_rele_flags(ds, dsflags, FTAG);
return (SET_ERROR(EINVAL));
}
/*
* Note: resume point will be checked when we process the first WRITE
* record.
*/
/* check that the origin matches */
val = 0;
(void) zap_lookup(dp->dp_meta_objset, ds->ds_object,
DS_FIELD_RESUME_FROMGUID, sizeof (val), 1, &val);
if (drrb->drr_fromguid != val) {
dsl_dataset_rele_flags(ds, dsflags, FTAG);
return (SET_ERROR(EINVAL));
}
if (ds->ds_prev != NULL && drrb->drr_fromguid != 0)
drc->drc_fromsnapobj = ds->ds_prev->ds_object;
/*
* If we're resuming, and the send is redacted, then the original send
* must have been redacted, and must have been redacted with respect to
* the same snapshots.
*/
if (drc->drc_featureflags & DMU_BACKUP_FEATURE_REDACTED) {
uint64_t num_ds_redact_snaps;
uint64_t *ds_redact_snaps;
uint_t num_stream_redact_snaps;
uint64_t *stream_redact_snaps;
if (nvlist_lookup_uint64_array(drc->drc_begin_nvl,
BEGINNV_REDACT_SNAPS, &stream_redact_snaps,
&num_stream_redact_snaps) != 0) {
dsl_dataset_rele_flags(ds, dsflags, FTAG);
return (SET_ERROR(EINVAL));
}
if (!dsl_dataset_get_uint64_array_feature(ds,
SPA_FEATURE_REDACTED_DATASETS, &num_ds_redact_snaps,
&ds_redact_snaps)) {
dsl_dataset_rele_flags(ds, dsflags, FTAG);
return (SET_ERROR(EINVAL));
}
for (int i = 0; i < num_ds_redact_snaps; i++) {
if (!redact_snaps_contains(ds_redact_snaps,
num_ds_redact_snaps, stream_redact_snaps[i])) {
dsl_dataset_rele_flags(ds, dsflags, FTAG);
return (SET_ERROR(EINVAL));
}
}
}
error = recv_check_large_blocks(ds, drc->drc_featureflags);
if (error != 0) {
dsl_dataset_rele_flags(ds, dsflags, FTAG);
return (error);
}
dsl_dataset_rele_flags(ds, dsflags, FTAG);
return (0);
}
static void
dmu_recv_resume_begin_sync(void *arg, dmu_tx_t *tx)
{
dmu_recv_begin_arg_t *drba = arg;
dsl_pool_t *dp = dmu_tx_pool(tx);
const char *tofs = drba->drba_cookie->drc_tofs;
uint64_t featureflags = drba->drba_cookie->drc_featureflags;
dsl_dataset_t *ds;
ds_hold_flags_t dsflags = 0;
/* 6 extra bytes for /%recv */
char recvname[ZFS_MAX_DATASET_NAME_LEN + 6];
(void) snprintf(recvname, sizeof (recvname), "%s/%s", tofs,
recv_clone_name);
if (featureflags & DMU_BACKUP_FEATURE_RAW) {
drba->drba_cookie->drc_raw = B_TRUE;
} else {
dsflags |= DS_HOLD_FLAG_DECRYPT;
}
if (dsl_dataset_own_force(dp, recvname, dsflags, dmu_recv_tag, &ds)
!= 0) {
/* %recv does not exist; continue in tofs */
VERIFY0(dsl_dataset_own_force(dp, tofs, dsflags, dmu_recv_tag,
&ds));
drba->drba_cookie->drc_newfs = B_TRUE;
}
ASSERT(DS_IS_INCONSISTENT(ds));
rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG);
ASSERT(!BP_IS_HOLE(dsl_dataset_get_blkptr(ds)) ||
drba->drba_cookie->drc_raw);
rrw_exit(&ds->ds_bp_rwlock, FTAG);
drba->drba_cookie->drc_ds = ds;
VERIFY0(dmu_objset_from_ds(ds, &drba->drba_cookie->drc_os));
drba->drba_cookie->drc_should_save = B_TRUE;
spa_history_log_internal_ds(ds, "resume 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, dmu_replay_record_t *drr_begin,
boolean_t force, boolean_t resumable, nvlist_t *localprops,
nvlist_t *hidden_args, char *origin, dmu_recv_cookie_t *drc,
zfs_file_t *fp, offset_t *voffp)
{
dmu_recv_begin_arg_t drba = { 0 };
int err;
bzero(drc, sizeof (dmu_recv_cookie_t));
drc->drc_drr_begin = drr_begin;
drc->drc_drrb = &drr_begin->drr_u.drr_begin;
drc->drc_tosnap = tosnap;
drc->drc_tofs = tofs;
drc->drc_force = force;
drc->drc_resumable = resumable;
drc->drc_cred = CRED();
drc->drc_proc = curproc;
drc->drc_clone = (origin != NULL);
if (drc->drc_drrb->drr_magic == BSWAP_64(DMU_BACKUP_MAGIC)) {
drc->drc_byteswap = B_TRUE;
(void) fletcher_4_incremental_byteswap(drr_begin,
sizeof (dmu_replay_record_t), &drc->drc_cksum);
byteswap_record(drr_begin);
} else if (drc->drc_drrb->drr_magic == DMU_BACKUP_MAGIC) {
(void) fletcher_4_incremental_native(drr_begin,
sizeof (dmu_replay_record_t), &drc->drc_cksum);
} else {
return (SET_ERROR(EINVAL));
}
drc->drc_fp = fp;
drc->drc_voff = *voffp;
drc->drc_featureflags =
DMU_GET_FEATUREFLAGS(drc->drc_drrb->drr_versioninfo);
uint32_t payloadlen = drc->drc_drr_begin->drr_payloadlen;
void *payload = NULL;
if (payloadlen != 0)
payload = kmem_alloc(payloadlen, KM_SLEEP);
err = receive_read_payload_and_next_header(drc, payloadlen,
payload);
if (err != 0) {
kmem_free(payload, payloadlen);
return (err);
}
if (payloadlen != 0) {
err = nvlist_unpack(payload, payloadlen, &drc->drc_begin_nvl,
KM_SLEEP);
kmem_free(payload, payloadlen);
if (err != 0) {
kmem_free(drc->drc_next_rrd,
sizeof (*drc->drc_next_rrd));
return (err);
}
}
if (drc->drc_drrb->drr_flags & DRR_FLAG_SPILL_BLOCK)
drc->drc_spill = B_TRUE;
drba.drba_origin = origin;
drba.drba_cookie = drc;
drba.drba_cred = CRED();
drba.drba_proc = curproc;
if (drc->drc_featureflags & DMU_BACKUP_FEATURE_RESUMING) {
err = dsl_sync_task(tofs,
dmu_recv_resume_begin_check, dmu_recv_resume_begin_sync,
&drba, 5, ZFS_SPACE_CHECK_NORMAL);
} else {
/*
* For non-raw, non-incremental, non-resuming receives the
* user can specify encryption parameters on the command line
* with "zfs recv -o". For these receives we create a dcp and
* pass it to the sync task. Creating the dcp will implicitly
* remove the encryption params from the localprops nvlist,
* which avoids errors when trying to set these normally
* read-only properties. Any other kind of receive that
* attempts to set these properties will fail as a result.
*/
if ((DMU_GET_FEATUREFLAGS(drc->drc_drrb->drr_versioninfo) &
DMU_BACKUP_FEATURE_RAW) == 0 &&
origin == NULL && drc->drc_drrb->drr_fromguid == 0) {
err = dsl_crypto_params_create_nvlist(DCP_CMD_NONE,
localprops, hidden_args, &drba.drba_dcp);
}
if (err == 0) {
err = dsl_sync_task(tofs,
dmu_recv_begin_check, dmu_recv_begin_sync,
&drba, 5, ZFS_SPACE_CHECK_NORMAL);
dsl_crypto_params_free(drba.drba_dcp, !!err);
}
}
if (err != 0) {
kmem_free(drc->drc_next_rrd, sizeof (*drc->drc_next_rrd));
nvlist_free(drc->drc_begin_nvl);
}
return (err);
}
static int
receive_read(dmu_recv_cookie_t *drc, int len, void *buf)
{
int done = 0;
/*
* The code doesn't rely on this (lengths being multiples of 8). See
* comment in dump_bytes.
*/
ASSERT(len % 8 == 0 ||
(drc->drc_featureflags & DMU_BACKUP_FEATURE_RAW) != 0);
while (done < len) {
ssize_t resid;
zfs_file_t *fp = drc->drc_fp;
int err = zfs_file_read(fp, (char *)buf + done,
len - done, &resid);
if (resid == len - done) {
/*
* Note: ECKSUM or ZFS_ERR_STREAM_TRUNCATED indicates
* that the receive was interrupted and can
* potentially be resumed.
*/
err = SET_ERROR(ZFS_ERR_STREAM_TRUNCATED);
}
drc->drc_voff += len - done - resid;
done = len - resid;
if (err != 0)
return (err);
}
drc->drc_bytes_read += len;
ASSERT3U(done, ==, len);
return (0);
}
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_OLD_MAX_BONUSLEN -
MIN(DN_OLD_MAX_BONUSLEN, bonus_size)) >> SPA_BLKPTRSHIFT));
}
}
static void
save_resume_state(struct receive_writer_arg *rwa,
uint64_t object, uint64_t offset, dmu_tx_t *tx)
{
int txgoff = dmu_tx_get_txg(tx) & TXG_MASK;
if (!rwa->resumable)
return;
/*
* We use ds_resume_bytes[] != 0 to indicate that we need to
* update this on disk, so it must not be 0.
*/
ASSERT(rwa->bytes_read != 0);
/*
* We only resume from write records, which have a valid
* (non-meta-dnode) object number.
*/
ASSERT(object != 0);
/*
* For resuming to work correctly, we must receive records in order,
* sorted by object,offset. This is checked by the callers, but
* assert it here for good measure.
*/
ASSERT3U(object, >=, rwa->os->os_dsl_dataset->ds_resume_object[txgoff]);
ASSERT(object != rwa->os->os_dsl_dataset->ds_resume_object[txgoff] ||
offset >= rwa->os->os_dsl_dataset->ds_resume_offset[txgoff]);
ASSERT3U(rwa->bytes_read, >=,
rwa->os->os_dsl_dataset->ds_resume_bytes[txgoff]);
rwa->os->os_dsl_dataset->ds_resume_object[txgoff] = object;
rwa->os->os_dsl_dataset->ds_resume_offset[txgoff] = offset;
rwa->os->os_dsl_dataset->ds_resume_bytes[txgoff] = rwa->bytes_read;
}
static int
receive_object_is_same_generation(objset_t *os, uint64_t object,
dmu_object_type_t old_bonus_type, dmu_object_type_t new_bonus_type,
const void *new_bonus, boolean_t *samegenp)
{
zfs_file_info_t zoi;
int err;
dmu_buf_t *old_bonus_dbuf;
err = dmu_bonus_hold(os, object, FTAG, &old_bonus_dbuf);
if (err != 0)
return (err);
err = dmu_get_file_info(os, old_bonus_type, old_bonus_dbuf->db_data,
&zoi);
dmu_buf_rele(old_bonus_dbuf, FTAG);
if (err != 0)
return (err);
uint64_t old_gen = zoi.zfi_generation;
err = dmu_get_file_info(os, new_bonus_type, new_bonus, &zoi);
if (err != 0)
return (err);
uint64_t new_gen = zoi.zfi_generation;
*samegenp = (old_gen == new_gen);
return (0);
}
static int
receive_handle_existing_object(const struct receive_writer_arg *rwa,
const struct drr_object *drro, const dmu_object_info_t *doi,
const void *bonus_data,
uint64_t *object_to_hold, uint32_t *new_blksz)
{
uint32_t indblksz = drro->drr_indblkshift ?
1ULL << drro->drr_indblkshift : 0;
int nblkptr = deduce_nblkptr(drro->drr_bonustype,
drro->drr_bonuslen);
uint8_t dn_slots = drro->drr_dn_slots != 0 ?
drro->drr_dn_slots : DNODE_MIN_SLOTS;
boolean_t do_free_range = B_FALSE;
int err;
*object_to_hold = drro->drr_object;
/* nblkptr should be bounded by the bonus size and type */
if (rwa->raw && nblkptr != drro->drr_nblkptr)
return (SET_ERROR(EINVAL));
/*
* After the previous send stream, the sending system may
* have freed this object, and then happened to re-allocate
* this object number in a later txg. In this case, we are
* receiving a different logical file, and the block size may
* appear to be different. i.e. we may have a different
* block size for this object than what the send stream says.
* In this case we need to remove the object's contents,
* so that its structure can be changed and then its contents
* entirely replaced by subsequent WRITE records.
*
* If this is a -L (--large-block) incremental stream, and
* the previous stream was not -L, the block size may appear
* to increase. i.e. we may have a smaller block size for
* this object than what the send stream says. In this case
* we need to keep the object's contents and block size
* intact, so that we don't lose parts of the object's
* contents that are not changed by this incremental send
* stream.
*
* We can distinguish between the two above cases by using
* the ZPL's generation number (see
* receive_object_is_same_generation()). However, we only
* want to rely on the generation number when absolutely
* necessary, because with raw receives, the generation is
* encrypted. We also want to minimize dependence on the
* ZPL, so that other types of datasets can also be received
* (e.g. ZVOLs, although note that ZVOLS currently do not
* reallocate their objects or change their structure).
* Therefore, we check a number of different cases where we
* know it is safe to discard the object's contents, before
* using the ZPL's generation number to make the above
* distinction.
*/
if (drro->drr_blksz != doi->doi_data_block_size) {
if (rwa->raw) {
/*
* RAW streams always have large blocks, so
* we are sure that the data is not needed
* due to changing --large-block to be on.
* Which is fortunate since the bonus buffer
* (which contains the ZPL generation) is
* encrypted, and the key might not be
* loaded.
*/
do_free_range = B_TRUE;
} else if (rwa->full) {
/*
* This is a full send stream, so it always
* replaces what we have. Even if the
* generation numbers happen to match, this
* can not actually be the same logical file.
* This is relevant when receiving a full
* send as a clone.
*/
do_free_range = B_TRUE;
} else if (drro->drr_type !=
DMU_OT_PLAIN_FILE_CONTENTS ||
doi->doi_type != DMU_OT_PLAIN_FILE_CONTENTS) {
/*
* PLAIN_FILE_CONTENTS are the only type of
* objects that have ever been stored with
* large blocks, so we don't need the special
* logic below. ZAP blocks can shrink (when
* there's only one block), so we don't want
* to hit the error below about block size
* only increasing.
*/
do_free_range = B_TRUE;
} else if (doi->doi_max_offset <=
doi->doi_data_block_size) {
/*
* There is only one block. We can free it,
* because its contents will be replaced by a
* WRITE record. This can not be the no-L ->
* -L case, because the no-L case would have
* resulted in multiple blocks. If we
* supported -L -> no-L, it would not be safe
* to free the file's contents. Fortunately,
* that is not allowed (see
* recv_check_large_blocks()).
*/
do_free_range = B_TRUE;
} else {
boolean_t is_same_gen;
err = receive_object_is_same_generation(rwa->os,
drro->drr_object, doi->doi_bonus_type,
drro->drr_bonustype, bonus_data, &is_same_gen);
if (err != 0)
return (SET_ERROR(EINVAL));
if (is_same_gen) {
/*
* This is the same logical file, and
* the block size must be increasing.
* It could only decrease if
* --large-block was changed to be
* off, which is checked in
* recv_check_large_blocks().
*/
if (drro->drr_blksz <=
doi->doi_data_block_size)
return (SET_ERROR(EINVAL));
/*
* We keep the existing blocksize and
* contents.
*/
*new_blksz =
doi->doi_data_block_size;
} else {
do_free_range = B_TRUE;
}
}
}
/* nblkptr can only decrease if the object was reallocated */
if (nblkptr < doi->doi_nblkptr)
do_free_range = B_TRUE;
/* number of slots can only change on reallocation */
if (dn_slots != doi->doi_dnodesize >> DNODE_SHIFT)
do_free_range = B_TRUE;
/*
* For raw sends we also check a few other fields to
* ensure we are preserving the objset structure exactly
* as it was on the receive side:
* - A changed indirect block size
* - A smaller nlevels
*/
if (rwa->raw) {
if (indblksz != doi->doi_metadata_block_size)
do_free_range = B_TRUE;
if (drro->drr_nlevels < doi->doi_indirection)
do_free_range = B_TRUE;
}
if (do_free_range) {
err = dmu_free_long_range(rwa->os, drro->drr_object,
0, DMU_OBJECT_END);
if (err != 0)
return (SET_ERROR(EINVAL));
}
/*
* The dmu does not currently support decreasing nlevels
* or changing the number of dnode slots on an object. For
* non-raw sends, this does not matter and the new object
* can just use the previous one's nlevels. For raw sends,
* however, the structure of the received dnode (including
* nlevels and dnode slots) must match that of the send
* side. Therefore, instead of using dmu_object_reclaim(),
* we must free the object completely and call
* dmu_object_claim_dnsize() instead.
*/
if ((rwa->raw && drro->drr_nlevels < doi->doi_indirection) ||
dn_slots != doi->doi_dnodesize >> DNODE_SHIFT) {
err = dmu_free_long_object(rwa->os, drro->drr_object);
if (err != 0)
return (SET_ERROR(EINVAL));
txg_wait_synced(dmu_objset_pool(rwa->os), 0);
*object_to_hold = DMU_NEW_OBJECT;
}
/*
* For raw receives, free everything beyond the new incoming
* maxblkid. Normally this would be done with a DRR_FREE
* record that would come after this DRR_OBJECT record is
* processed. However, for raw receives we manually set the
* maxblkid from the drr_maxblkid and so we must first free
* everything above that blkid to ensure the DMU is always
* consistent with itself. We will never free the first block
* of the object here because a maxblkid of 0 could indicate
* an object with a single block or one with no blocks. This
* free may be skipped when dmu_free_long_range() was called
* above since it covers the entire object's contents.
*/
if (rwa->raw && *object_to_hold != DMU_NEW_OBJECT && !do_free_range) {
err = dmu_free_long_range(rwa->os, drro->drr_object,
(drro->drr_maxblkid + 1) * doi->doi_data_block_size,
DMU_OBJECT_END);
if (err != 0)
return (SET_ERROR(EINVAL));
}
return (0);
}
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;
int err;
uint32_t new_blksz = drro->drr_blksz;
uint8_t dn_slots = drro->drr_dn_slots != 0 ?
drro->drr_dn_slots : DNODE_MIN_SLOTS;
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_BONUS_SIZE(spa_maxdnodesize(dmu_objset_spa(rwa->os))) ||
dn_slots >
(spa_maxdnodesize(dmu_objset_spa(rwa->os)) >> DNODE_SHIFT)) {
return (SET_ERROR(EINVAL));
}
if (rwa->raw) {
/*
* We should have received a DRR_OBJECT_RANGE record
* containing this block and stored it in rwa.
*/
if (drro->drr_object < rwa->or_firstobj ||
drro->drr_object >= rwa->or_firstobj + rwa->or_numslots ||
drro->drr_raw_bonuslen < drro->drr_bonuslen ||
drro->drr_indblkshift > SPA_MAXBLOCKSHIFT ||
drro->drr_nlevels > DN_MAX_LEVELS ||
drro->drr_nblkptr > DN_MAX_NBLKPTR ||
DN_SLOTS_TO_BONUSLEN(dn_slots) <
drro->drr_raw_bonuslen)
return (SET_ERROR(EINVAL));
} else {
/*
* The DRR_OBJECT_SPILL flag is valid when the DRR_BEGIN
* record indicates this by setting DRR_FLAG_SPILL_BLOCK.
*/
if (((drro->drr_flags & ~(DRR_OBJECT_SPILL))) ||
(!rwa->spill && DRR_OBJECT_HAS_SPILL(drro->drr_flags))) {
return (SET_ERROR(EINVAL));
}
if (drro->drr_raw_bonuslen != 0 || drro->drr_nblkptr != 0 ||
drro->drr_indblkshift != 0 || drro->drr_nlevels != 0) {
return (SET_ERROR(EINVAL));
}
}
err = dmu_object_info(rwa->os, drro->drr_object, &doi);
if (err != 0 && err != ENOENT && err != EEXIST)
return (SET_ERROR(EINVAL));
if (drro->drr_object > rwa->max_object)
rwa->max_object = drro->drr_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.
* Raw receives will also check that the indirect structure of the
* dnode hasn't changed.
*/
uint64_t object_to_hold;
if (err == 0) {
err = receive_handle_existing_object(rwa, drro, &doi, data,
&object_to_hold, &new_blksz);
} else if (err == EEXIST) {
/*
* The object requested is currently an interior slot of a
* multi-slot dnode. This will be resolved when the next txg
* is synced out, since the send stream will have told us
* to free this slot when we freed the associated dnode
* earlier in the stream.
*/
txg_wait_synced(dmu_objset_pool(rwa->os), 0);
if (dmu_object_info(rwa->os, drro->drr_object, NULL) != ENOENT)
return (SET_ERROR(EINVAL));
/* object was freed and we are about to allocate a new one */
object_to_hold = DMU_NEW_OBJECT;
} else {
/* object is free and we are about to allocate a new one */
object_to_hold = DMU_NEW_OBJECT;
}
/*
* If this is a multi-slot dnode there is a chance that this
* object will expand into a slot that is already used by
* another object from the previous snapshot. We must free
* these objects before we attempt to allocate the new dnode.
*/
if (dn_slots > 1) {
boolean_t need_sync = B_FALSE;
for (uint64_t slot = drro->drr_object + 1;
slot < drro->drr_object + dn_slots;
slot++) {
dmu_object_info_t slot_doi;
err = dmu_object_info(rwa->os, slot, &slot_doi);
if (err == ENOENT || err == EEXIST)
continue;
else if (err != 0)
return (err);
err = dmu_free_long_object(rwa->os, slot);
if (err != 0)
return (err);
need_sync = B_TRUE;
}
if (need_sync)
txg_wait_synced(dmu_objset_pool(rwa->os), 0);
}
tx = dmu_tx_create(rwa->os);
dmu_tx_hold_bonus(tx, object_to_hold);
dmu_tx_hold_write(tx, object_to_hold, 0, 0);
err = dmu_tx_assign(tx, TXG_WAIT);
if (err != 0) {
dmu_tx_abort(tx);
return (err);
}
if (object_to_hold == DMU_NEW_OBJECT) {
/* Currently free, wants to be allocated */
err = dmu_object_claim_dnsize(rwa->os, drro->drr_object,
drro->drr_type, new_blksz,
drro->drr_bonustype, drro->drr_bonuslen,
dn_slots << DNODE_SHIFT, tx);
} else if (drro->drr_type != doi.doi_type ||
new_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_dnsize(rwa->os, drro->drr_object,
drro->drr_type, new_blksz,
drro->drr_bonustype, drro->drr_bonuslen,
dn_slots << DNODE_SHIFT, rwa->spill ?
DRR_OBJECT_HAS_SPILL(drro->drr_flags) : B_FALSE, tx);
} else if (rwa->spill && !DRR_OBJECT_HAS_SPILL(drro->drr_flags)) {
/*
* Currently allocated, the existing version of this object
* may reference a spill block that is no longer allocated
* at the source and needs to be freed.
*/
err = dmu_object_rm_spill(rwa->os, drro->drr_object, tx);
}
if (err != 0) {
dmu_tx_commit(tx);
return (SET_ERROR(EINVAL));
}
if (rwa->or_crypt_params_present) {
/*
* Set the crypt params for the buffer associated with this
* range of dnodes. This causes the blkptr_t to have the
* same crypt params (byteorder, salt, iv, mac) as on the
* sending side.
*
* Since we are committing this tx now, it is possible for
* the dnode block to end up on-disk with the incorrect MAC,
* if subsequent objects in this block are received in a
* different txg. However, since the dataset is marked as
* inconsistent, no code paths will do a non-raw read (or
* decrypt the block / verify the MAC). The receive code and
* scrub code can safely do raw reads and verify the
* checksum. They don't need to verify the MAC.
*/
dmu_buf_t *db = NULL;
uint64_t offset = rwa->or_firstobj * DNODE_MIN_SIZE;
err = dmu_buf_hold_by_dnode(DMU_META_DNODE(rwa->os),
offset, FTAG, &db, DMU_READ_PREFETCH | DMU_READ_NO_DECRYPT);
if (err != 0) {
dmu_tx_commit(tx);
return (SET_ERROR(EINVAL));
}
dmu_buf_set_crypt_params(db, rwa->or_byteorder,
rwa->or_salt, rwa->or_iv, rwa->or_mac, tx);
dmu_buf_rele(db, FTAG);
rwa->or_crypt_params_present = B_FALSE;
}
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);
/* handle more restrictive dnode structuring for raw recvs */
if (rwa->raw) {
/*
* Set the indirect block size, block shift, nlevels.
* This will not fail because we ensured all of the
* blocks were freed earlier if this is a new object.
* For non-new objects block size and indirect block
* shift cannot change and nlevels can only increase.
*/
ASSERT3U(new_blksz, ==, drro->drr_blksz);
VERIFY0(dmu_object_set_blocksize(rwa->os, drro->drr_object,
drro->drr_blksz, drro->drr_indblkshift, tx));
VERIFY0(dmu_object_set_nlevels(rwa->os, drro->drr_object,
drro->drr_nlevels, tx));
/*
* Set the maxblkid. This will always succeed because
* we freed all blocks beyond the new maxblkid above.
*/
VERIFY0(dmu_object_set_maxblkid(rwa->os, drro->drr_object,
drro->drr_maxblkid, tx));
}
if (data != NULL) {
dmu_buf_t *db;
dnode_t *dn;
uint32_t flags = DMU_READ_NO_PREFETCH;
if (rwa->raw)
flags |= DMU_READ_NO_DECRYPT;
VERIFY0(dnode_hold(rwa->os, drro->drr_object, FTAG, &dn));
VERIFY0(dmu_bonus_hold_by_dnode(dn, FTAG, &db, flags));
dmu_buf_will_dirty(db, tx);
ASSERT3U(db->db_size, >=, drro->drr_bonuslen);
bcopy(data, db->db_data, DRR_OBJECT_PAYLOAD_SIZE(drro));
/*
* Raw bonus buffers have their byteorder determined by the
* DRR_OBJECT_RANGE record.
*/
if (rwa->byteswap && !rwa->raw) {
dmu_object_byteswap_t byteswap =
DMU_OT_BYTESWAP(drro->drr_bonustype);
dmu_ot_byteswap[byteswap].ob_func(db->db_data,
DRR_OBJECT_PAYLOAD_SIZE(drro));
}
dmu_buf_rele(db, FTAG);
dnode_rele(dn, 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;
int next_err = 0;
if (drrfo->drr_firstobj + drrfo->drr_numobjs < drrfo->drr_firstobj)
return (SET_ERROR(EINVAL));
for (obj = drrfo->drr_firstobj == 0 ? 1 : drrfo->drr_firstobj;
obj < drrfo->drr_firstobj + drrfo->drr_numobjs &&
obj < DN_MAX_OBJECT && next_err == 0;
next_err = dmu_object_next(rwa->os, &obj, FALSE, 0)) {
dmu_object_info_t doi;
int err;
err = dmu_object_info(rwa->os, obj, &doi);
if (err == ENOENT)
continue;
else if (err != 0)
return (err);
err = dmu_free_long_object(rwa->os, obj);
if (err != 0)
return (err);
}
if (next_err != ESRCH)
return (next_err);
return (0);
}
/*
* Note: if this fails, the caller will clean up any records left on the
* rwa->write_batch list.
*/
static int
flush_write_batch_impl(struct receive_writer_arg *rwa)
{
dnode_t *dn;
int err;
if (dnode_hold(rwa->os, rwa->last_object, FTAG, &dn) != 0)
return (SET_ERROR(EINVAL));
struct receive_record_arg *last_rrd = list_tail(&rwa->write_batch);
struct drr_write *last_drrw = &last_rrd->header.drr_u.drr_write;
struct receive_record_arg *first_rrd = list_head(&rwa->write_batch);
struct drr_write *first_drrw = &first_rrd->header.drr_u.drr_write;
ASSERT3U(rwa->last_object, ==, last_drrw->drr_object);
ASSERT3U(rwa->last_offset, ==, last_drrw->drr_offset);
dmu_tx_t *tx = dmu_tx_create(rwa->os);
dmu_tx_hold_write_by_dnode(tx, dn, first_drrw->drr_offset,
last_drrw->drr_offset - first_drrw->drr_offset +
last_drrw->drr_logical_size);
err = dmu_tx_assign(tx, TXG_WAIT);
if (err != 0) {
dmu_tx_abort(tx);
dnode_rele(dn, FTAG);
return (err);
}
struct receive_record_arg *rrd;
while ((rrd = list_head(&rwa->write_batch)) != NULL) {
struct drr_write *drrw = &rrd->header.drr_u.drr_write;
abd_t *abd = rrd->abd;
ASSERT3U(drrw->drr_object, ==, rwa->last_object);
if (drrw->drr_logical_size != dn->dn_datablksz) {
/*
* The WRITE record is larger than the object's block
* size. We must be receiving an incremental
* large-block stream into a dataset that previously did
* a non-large-block receive. Lightweight writes must
* be exactly one block, so we need to decompress the
* data (if compressed) and do a normal dmu_write().
*/
ASSERT3U(drrw->drr_logical_size, >, dn->dn_datablksz);
if (DRR_WRITE_COMPRESSED(drrw)) {
abd_t *decomp_abd =
abd_alloc_linear(drrw->drr_logical_size,
B_FALSE);
err = zio_decompress_data(
drrw->drr_compressiontype,
abd, abd_to_buf(decomp_abd),
abd_get_size(abd),
abd_get_size(decomp_abd), NULL);
if (err == 0) {
dmu_write_by_dnode(dn,
drrw->drr_offset,
drrw->drr_logical_size,
abd_to_buf(decomp_abd), tx);
}
abd_free(decomp_abd);
} else {
dmu_write_by_dnode(dn,
drrw->drr_offset,
drrw->drr_logical_size,
abd_to_buf(abd), tx);
}
if (err == 0)
abd_free(abd);
} else {
zio_prop_t zp;
dmu_write_policy(rwa->os, dn, 0, 0, &zp);
enum zio_flag zio_flags = 0;
if (rwa->raw) {
zp.zp_encrypt = B_TRUE;
zp.zp_compress = drrw->drr_compressiontype;
zp.zp_byteorder = ZFS_HOST_BYTEORDER ^
!!DRR_IS_RAW_BYTESWAPPED(drrw->drr_flags) ^
rwa->byteswap;
bcopy(drrw->drr_salt, zp.zp_salt,
ZIO_DATA_SALT_LEN);
bcopy(drrw->drr_iv, zp.zp_iv,
ZIO_DATA_IV_LEN);
bcopy(drrw->drr_mac, zp.zp_mac,
ZIO_DATA_MAC_LEN);
if (DMU_OT_IS_ENCRYPTED(zp.zp_type)) {
zp.zp_nopwrite = B_FALSE;
zp.zp_copies = MIN(zp.zp_copies,
SPA_DVAS_PER_BP - 1);
}
zio_flags |= ZIO_FLAG_RAW;
} else if (DRR_WRITE_COMPRESSED(drrw)) {
ASSERT3U(drrw->drr_compressed_size, >, 0);
ASSERT3U(drrw->drr_logical_size, >=,
drrw->drr_compressed_size);
zp.zp_compress = drrw->drr_compressiontype;
zio_flags |= ZIO_FLAG_RAW_COMPRESS;
} else if (rwa->byteswap) {
/*
* Note: compressed blocks never need to be
* byteswapped, because WRITE records for
* metadata blocks are never compressed. The
* exception is raw streams, which are written
* in the original byteorder, and the byteorder
* bit is preserved in the BP by setting
* zp_byteorder above.
*/
dmu_object_byteswap_t byteswap =
DMU_OT_BYTESWAP(drrw->drr_type);
dmu_ot_byteswap[byteswap].ob_func(
abd_to_buf(abd),
DRR_WRITE_PAYLOAD_SIZE(drrw));
}
/*
* Since this data can't be read until the receive
* completes, we can do a "lightweight" write for
* improved performance.
*/
err = dmu_lightweight_write_by_dnode(dn,
drrw->drr_offset, abd, &zp, zio_flags, tx);
}
if (err != 0) {
/*
* This rrd is left on the list, so the caller will
* free it (and the abd).
*/
break;
}
/*
* Note: If the receive fails, we want the resume stream to
* start with the same record that we last successfully
* received (as opposed to the next record), so that we can
* verify that we are resuming from the correct location.
*/
save_resume_state(rwa, drrw->drr_object, drrw->drr_offset, tx);
list_remove(&rwa->write_batch, rrd);
kmem_free(rrd, sizeof (*rrd));
}
dmu_tx_commit(tx);
dnode_rele(dn, FTAG);
return (err);
}
noinline static int
flush_write_batch(struct receive_writer_arg *rwa)
{
if (list_is_empty(&rwa->write_batch))
return (0);
int err = rwa->err;
if (err == 0)
err = flush_write_batch_impl(rwa);
if (err != 0) {
struct receive_record_arg *rrd;
while ((rrd = list_remove_head(&rwa->write_batch)) != NULL) {
abd_free(rrd->abd);
kmem_free(rrd, sizeof (*rrd));
}
}
ASSERT(list_is_empty(&rwa->write_batch));
return (err);
}
noinline static int
receive_process_write_record(struct receive_writer_arg *rwa,
struct receive_record_arg *rrd)
{
int err = 0;
ASSERT3U(rrd->header.drr_type, ==, DRR_WRITE);
struct drr_write *drrw = &rrd->header.drr_u.drr_write;
if (drrw->drr_offset + drrw->drr_logical_size < drrw->drr_offset ||
!DMU_OT_IS_VALID(drrw->drr_type))
return (SET_ERROR(EINVAL));
/*
* For resuming to work, records must be in increasing order
* by (object, offset).
*/
if (drrw->drr_object < rwa->last_object ||
(drrw->drr_object == rwa->last_object &&
drrw->drr_offset < rwa->last_offset)) {
return (SET_ERROR(EINVAL));
}
struct receive_record_arg *first_rrd = list_head(&rwa->write_batch);
struct drr_write *first_drrw = &first_rrd->header.drr_u.drr_write;
uint64_t batch_size =
MIN(zfs_recv_write_batch_size, DMU_MAX_ACCESS / 2);
if (first_rrd != NULL &&
(drrw->drr_object != first_drrw->drr_object ||
drrw->drr_offset >= first_drrw->drr_offset + batch_size)) {
err = flush_write_batch(rwa);
if (err != 0)
return (err);
}
rwa->last_object = drrw->drr_object;
rwa->last_offset = drrw->drr_offset;
if (rwa->last_object > rwa->max_object)
rwa->max_object = rwa->last_object;
list_insert_tail(&rwa->write_batch, rrd);
/*
* Return EAGAIN to indicate that we will use this rrd again,
* so the caller should not free it
*/
return (EAGAIN);
}
static int
receive_write_embedded(struct receive_writer_arg *rwa,
struct drr_write_embedded *drrwe, void *data)
{
dmu_tx_t *tx;
int err;
if (drrwe->drr_offset + drrwe->drr_length < drrwe->drr_offset)
return (SET_ERROR(EINVAL));
if (drrwe->drr_psize > BPE_PAYLOAD_SIZE)
return (SET_ERROR(EINVAL));
if (drrwe->drr_etype >= NUM_BP_EMBEDDED_TYPES)
return (SET_ERROR(EINVAL));
if (drrwe->drr_compression >= ZIO_COMPRESS_FUNCTIONS)
return (SET_ERROR(EINVAL));
if (rwa->raw)
return (SET_ERROR(EINVAL));
if (drrwe->drr_object > rwa->max_object)
rwa->max_object = drrwe->drr_object;
tx = dmu_tx_create(rwa->os);
dmu_tx_hold_write(tx, drrwe->drr_object,
drrwe->drr_offset, drrwe->drr_length);
err = dmu_tx_assign(tx, TXG_WAIT);
if (err != 0) {
dmu_tx_abort(tx);
return (err);
}
dmu_write_embedded(rwa->os, drrwe->drr_object,
drrwe->drr_offset, data, drrwe->drr_etype,
drrwe->drr_compression, drrwe->drr_lsize, drrwe->drr_psize,
rwa->byteswap ^ ZFS_HOST_BYTEORDER, tx);
/* See comment in restore_write. */
save_resume_state(rwa, drrwe->drr_object, drrwe->drr_offset, tx);
dmu_tx_commit(tx);
return (0);
}
static int
receive_spill(struct receive_writer_arg *rwa, struct drr_spill *drrs,
abd_t *abd)
{
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));
/*
* This is an unmodified spill block which was added to the stream
* to resolve an issue with incorrectly removing spill blocks. It
* should be ignored by current versions of the code which support
* the DRR_FLAG_SPILL_BLOCK flag.
*/
if (rwa->spill && DRR_SPILL_IS_UNMODIFIED(drrs->drr_flags)) {
abd_free(abd);
return (0);
}
if (rwa->raw) {
if (!DMU_OT_IS_VALID(drrs->drr_type) ||
drrs->drr_compressiontype >= ZIO_COMPRESS_FUNCTIONS ||
drrs->drr_compressed_size == 0)
return (SET_ERROR(EINVAL));
}
if (dmu_object_info(rwa->os, drrs->drr_object, NULL) != 0)
return (SET_ERROR(EINVAL));
if (drrs->drr_object > rwa->max_object)
rwa->max_object = drrs->drr_object;
VERIFY0(dmu_bonus_hold(rwa->os, drrs->drr_object, FTAG, &db));
if ((err = dmu_spill_hold_by_bonus(db, DMU_READ_NO_DECRYPT, FTAG,
&db_spill)) != 0) {
dmu_buf_rele(db, FTAG);
return (err);
}
dmu_tx_t *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);
}
/*
* Spill blocks may both grow and shrink. When a change in size
* occurs any existing dbuf must be updated to match the logical
* size of the provided arc_buf_t.
*/
if (db_spill->db_size != drrs->drr_length) {
dmu_buf_will_fill(db_spill, tx);
VERIFY0(dbuf_spill_set_blksz(db_spill,
drrs->drr_length, tx));
}
arc_buf_t *abuf;
if (rwa->raw) {
boolean_t byteorder = ZFS_HOST_BYTEORDER ^
!!DRR_IS_RAW_BYTESWAPPED(drrs->drr_flags) ^
rwa->byteswap;
abuf = arc_loan_raw_buf(dmu_objset_spa(rwa->os),
drrs->drr_object, byteorder, drrs->drr_salt,
drrs->drr_iv, drrs->drr_mac, drrs->drr_type,
drrs->drr_compressed_size, drrs->drr_length,
drrs->drr_compressiontype, 0);
} else {
abuf = arc_loan_buf(dmu_objset_spa(rwa->os),
DMU_OT_IS_METADATA(drrs->drr_type),
drrs->drr_length);
if (rwa->byteswap) {
dmu_object_byteswap_t byteswap =
DMU_OT_BYTESWAP(drrs->drr_type);
dmu_ot_byteswap[byteswap].ob_func(abd_to_buf(abd),
DRR_SPILL_PAYLOAD_SIZE(drrs));
}
}
bcopy(abd_to_buf(abd), abuf->b_data, DRR_SPILL_PAYLOAD_SIZE(drrs));
abd_free(abd);
dbuf_assign_arcbuf((dmu_buf_impl_t *)db_spill, abuf, tx);
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));
if (drrf->drr_object > rwa->max_object)
rwa->max_object = drrf->drr_object;
err = dmu_free_long_range(rwa->os, drrf->drr_object,
drrf->drr_offset, drrf->drr_length);
return (err);
}
static int
receive_object_range(struct receive_writer_arg *rwa,
struct drr_object_range *drror)
{
/*
* By default, we assume this block is in our native format
* (ZFS_HOST_BYTEORDER). We then take into account whether
* the send stream is byteswapped (rwa->byteswap). Finally,
* we need to byteswap again if this particular block was
* in non-native format on the send side.
*/
boolean_t byteorder = ZFS_HOST_BYTEORDER ^ rwa->byteswap ^
!!DRR_IS_RAW_BYTESWAPPED(drror->drr_flags);
/*
* Since dnode block sizes are constant, we should not need to worry
* about making sure that the dnode block size is the same on the
* sending and receiving sides for the time being. For non-raw sends,
* this does not matter (and in fact we do not send a DRR_OBJECT_RANGE
* record at all). Raw sends require this record type because the
* encryption parameters are used to protect an entire block of bonus
* buffers. If the size of dnode blocks ever becomes variable,
* handling will need to be added to ensure that dnode block sizes
* match on the sending and receiving side.
*/
if (drror->drr_numslots != DNODES_PER_BLOCK ||
P2PHASE(drror->drr_firstobj, DNODES_PER_BLOCK) != 0 ||
!rwa->raw)
return (SET_ERROR(EINVAL));
if (drror->drr_firstobj > rwa->max_object)
rwa->max_object = drror->drr_firstobj;
/*
* The DRR_OBJECT_RANGE handling must be deferred to receive_object()
* so that the block of dnodes is not written out when it's empty,
* and converted to a HOLE BP.
*/
rwa->or_crypt_params_present = B_TRUE;
rwa->or_firstobj = drror->drr_firstobj;
rwa->or_numslots = drror->drr_numslots;
bcopy(drror->drr_salt, rwa->or_salt, ZIO_DATA_SALT_LEN);
bcopy(drror->drr_iv, rwa->or_iv, ZIO_DATA_IV_LEN);
bcopy(drror->drr_mac, rwa->or_mac, ZIO_DATA_MAC_LEN);
rwa->or_byteorder = byteorder;
return (0);
}
/*
* Until we have the ability to redact large ranges of data efficiently, we
* process these records as frees.
*/
/* ARGSUSED */
noinline static int
receive_redact(struct receive_writer_arg *rwa, struct drr_redact *drrr)
{
struct drr_free drrf = {0};
drrf.drr_length = drrr->drr_length;
drrf.drr_object = drrr->drr_object;
drrf.drr_offset = drrr->drr_offset;
drrf.drr_toguid = drrr->drr_toguid;
return (receive_free(rwa, &drrf));
}
/* used to destroy the drc_ds on error */
static void
dmu_recv_cleanup_ds(dmu_recv_cookie_t *drc)
{
dsl_dataset_t *ds = drc->drc_ds;
ds_hold_flags_t dsflags = (drc->drc_raw) ? 0 : DS_HOLD_FLAG_DECRYPT;
/*
* Wait for the txg sync before cleaning up the receive. For
* resumable receives, this ensures that our resume state has
* been written out to disk. For raw receives, this ensures
* that the user accounting code will not attempt to do anything
* after we stopped receiving the dataset.
*/
txg_wait_synced(ds->ds_dir->dd_pool, 0);
ds->ds_objset->os_raw_receive = B_FALSE;
rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG);
if (drc->drc_resumable && drc->drc_should_save &&
!BP_IS_HOLE(dsl_dataset_get_blkptr(ds))) {
rrw_exit(&ds->ds_bp_rwlock, FTAG);
dsl_dataset_disown(ds, dsflags, dmu_recv_tag);
} else {
char name[ZFS_MAX_DATASET_NAME_LEN];
rrw_exit(&ds->ds_bp_rwlock, FTAG);
dsl_dataset_name(ds, name);
dsl_dataset_disown(ds, dsflags, dmu_recv_tag);
(void) dsl_destroy_head(name);
}
}
static void
receive_cksum(dmu_recv_cookie_t *drc, int len, void *buf)
{
if (drc->drc_byteswap) {
(void) fletcher_4_incremental_byteswap(buf, len,
&drc->drc_cksum);
} else {
(void) fletcher_4_incremental_native(buf, len, &drc->drc_cksum);
}
}
/*
* Read the payload into a buffer of size len, and update the current record's
* payload field.
* Allocate drc->drc_next_rrd and read the next record's header into
* drc->drc_next_rrd->header.
* Verify checksum of payload and next record.
*/
static int
receive_read_payload_and_next_header(dmu_recv_cookie_t *drc, int len, void *buf)
{
int err;
if (len != 0) {
ASSERT3U(len, <=, SPA_MAXBLOCKSIZE);
err = receive_read(drc, len, buf);
if (err != 0)
return (err);
receive_cksum(drc, len, buf);
/* note: rrd is NULL when reading the begin record's payload */
if (drc->drc_rrd != NULL) {
drc->drc_rrd->payload = buf;
drc->drc_rrd->payload_size = len;
drc->drc_rrd->bytes_read = drc->drc_bytes_read;
}
} else {
ASSERT3P(buf, ==, NULL);
}
drc->drc_prev_cksum = drc->drc_cksum;
drc->drc_next_rrd = kmem_zalloc(sizeof (*drc->drc_next_rrd), KM_SLEEP);
err = receive_read(drc, sizeof (drc->drc_next_rrd->header),
&drc->drc_next_rrd->header);
drc->drc_next_rrd->bytes_read = drc->drc_bytes_read;
if (err != 0) {
kmem_free(drc->drc_next_rrd, sizeof (*drc->drc_next_rrd));
drc->drc_next_rrd = NULL;
return (err);
}
if (drc->drc_next_rrd->header.drr_type == DRR_BEGIN) {
kmem_free(drc->drc_next_rrd, sizeof (*drc->drc_next_rrd));
drc->drc_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(drc,
offsetof(dmu_replay_record_t, drr_u.drr_checksum.drr_checksum),
&drc->drc_next_rrd->header);
zio_cksum_t cksum_orig =
drc->drc_next_rrd->header.drr_u.drr_checksum.drr_checksum;
zio_cksum_t *cksump =
&drc->drc_next_rrd->header.drr_u.drr_checksum.drr_checksum;
if (drc->drc_byteswap)
byteswap_record(&drc->drc_next_rrd->header);
if ((!ZIO_CHECKSUM_IS_ZERO(cksump)) &&
!ZIO_CHECKSUM_EQUAL(drc->drc_cksum, *cksump)) {
kmem_free(drc->drc_next_rrd, sizeof (*drc->drc_next_rrd));
drc->drc_next_rrd = NULL;
return (SET_ERROR(ECKSUM));
}
receive_cksum(drc, 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(dmu_recv_cookie_t *drc, uint64_t object, uint64_t offset,
uint64_t length)
{
if (!objlist_exists(drc->drc_ignore_objlist, object)) {
dmu_prefetch(drc->drc_os, object, 1, offset, length,
ZIO_PRIORITY_SYNC_READ);
}
}
/*
* Read records off the stream, issuing any necessary prefetches.
*/
static int
receive_read_record(dmu_recv_cookie_t *drc)
{
int err;
switch (drc->drc_rrd->header.drr_type) {
case DRR_OBJECT:
{
struct drr_object *drro =
&drc->drc_rrd->header.drr_u.drr_object;
uint32_t size = DRR_OBJECT_PAYLOAD_SIZE(drro);
void *buf = NULL;
dmu_object_info_t doi;
if (size != 0)
buf = kmem_zalloc(size, KM_SLEEP);
err = receive_read_payload_and_next_header(drc, size, buf);
if (err != 0) {
kmem_free(buf, size);
return (err);
}
err = dmu_object_info(drc->drc_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 == EEXIST ||
(err == 0 && doi.doi_data_block_size != drro->drr_blksz)) {
objlist_insert(drc->drc_ignore_objlist,
drro->drr_object);
err = 0;
}
return (err);
}
case DRR_FREEOBJECTS:
{
err = receive_read_payload_and_next_header(drc, 0, NULL);
return (err);
}
case DRR_WRITE:
{
struct drr_write *drrw = &drc->drc_rrd->header.drr_u.drr_write;
int size = DRR_WRITE_PAYLOAD_SIZE(drrw);
abd_t *abd = abd_alloc_linear(size, B_FALSE);
err = receive_read_payload_and_next_header(drc, size,
abd_to_buf(abd));
if (err != 0) {
abd_free(abd);
return (err);
}
drc->drc_rrd->abd = abd;
receive_read_prefetch(drc, drrw->drr_object, drrw->drr_offset,
drrw->drr_logical_size);
return (err);
}
case DRR_WRITE_EMBEDDED:
{
struct drr_write_embedded *drrwe =
&drc->drc_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(drc, size, buf);
if (err != 0) {
kmem_free(buf, size);
return (err);
}
receive_read_prefetch(drc, drrwe->drr_object, drrwe->drr_offset,
drrwe->drr_length);
return (err);
}
case DRR_FREE:
case DRR_REDACT:
{
/*
* 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(drc, 0, NULL);
return (err);
}
case DRR_END:
{
struct drr_end *drre = &drc->drc_rrd->header.drr_u.drr_end;
if (!ZIO_CHECKSUM_EQUAL(drc->drc_prev_cksum,
drre->drr_checksum))
return (SET_ERROR(ECKSUM));
return (0);
}
case DRR_SPILL:
{
struct drr_spill *drrs = &drc->drc_rrd->header.drr_u.drr_spill;
int size = DRR_SPILL_PAYLOAD_SIZE(drrs);
abd_t *abd = abd_alloc_linear(size, B_FALSE);
err = receive_read_payload_and_next_header(drc, size,
abd_to_buf(abd));
if (err != 0)
abd_free(abd);
else
drc->drc_rrd->abd = abd;
return (err);
}
case DRR_OBJECT_RANGE:
{
err = receive_read_payload_and_next_header(drc, 0, NULL);
return (err);
}
default:
return (SET_ERROR(EINVAL));
}
}
static void
dprintf_drr(struct receive_record_arg *rrd, int err)
{
#ifdef ZFS_DEBUG
switch (rrd->header.drr_type) {
case DRR_OBJECT:
{
struct drr_object *drro = &rrd->header.drr_u.drr_object;
dprintf("drr_type = OBJECT obj = %llu type = %u "
"bonustype = %u blksz = %u bonuslen = %u cksumtype = %u "
"compress = %u dn_slots = %u err = %d\n",
drro->drr_object, drro->drr_type, drro->drr_bonustype,
drro->drr_blksz, drro->drr_bonuslen,
drro->drr_checksumtype, drro->drr_compress,
drro->drr_dn_slots, err);
break;
}
case DRR_FREEOBJECTS:
{
struct drr_freeobjects *drrfo =
&rrd->header.drr_u.drr_freeobjects;
dprintf("drr_type = FREEOBJECTS firstobj = %llu "
"numobjs = %llu err = %d\n",
drrfo->drr_firstobj, drrfo->drr_numobjs, err);
break;
}
case DRR_WRITE:
{
struct drr_write *drrw = &rrd->header.drr_u.drr_write;
dprintf("drr_type = WRITE obj = %llu type = %u offset = %llu "
"lsize = %llu cksumtype = %u flags = %u "
"compress = %u psize = %llu err = %d\n",
drrw->drr_object, drrw->drr_type, drrw->drr_offset,
drrw->drr_logical_size, drrw->drr_checksumtype,
drrw->drr_flags, drrw->drr_compressiontype,
drrw->drr_compressed_size, err);
break;
}
case DRR_WRITE_BYREF:
{
struct drr_write_byref *drrwbr =
&rrd->header.drr_u.drr_write_byref;
dprintf("drr_type = WRITE_BYREF obj = %llu offset = %llu "
"length = %llu toguid = %llx refguid = %llx "
"refobject = %llu refoffset = %llu cksumtype = %u "
"flags = %u err = %d\n",
drrwbr->drr_object, drrwbr->drr_offset,
drrwbr->drr_length, drrwbr->drr_toguid,
drrwbr->drr_refguid, drrwbr->drr_refobject,
drrwbr->drr_refoffset, drrwbr->drr_checksumtype,
drrwbr->drr_flags, err);
break;
}
case DRR_WRITE_EMBEDDED:
{
struct drr_write_embedded *drrwe =
&rrd->header.drr_u.drr_write_embedded;
dprintf("drr_type = WRITE_EMBEDDED obj = %llu offset = %llu "
"length = %llu compress = %u etype = %u lsize = %u "
"psize = %u err = %d\n",
drrwe->drr_object, drrwe->drr_offset, drrwe->drr_length,
drrwe->drr_compression, drrwe->drr_etype,
drrwe->drr_lsize, drrwe->drr_psize, err);
break;
}
case DRR_FREE:
{
struct drr_free *drrf = &rrd->header.drr_u.drr_free;
dprintf("drr_type = FREE obj = %llu offset = %llu "
"length = %lld err = %d\n",
drrf->drr_object, drrf->drr_offset, drrf->drr_length,
err);
break;
}
case DRR_SPILL:
{
struct drr_spill *drrs = &rrd->header.drr_u.drr_spill;
dprintf("drr_type = SPILL obj = %llu length = %llu "
"err = %d\n", drrs->drr_object, drrs->drr_length, err);
break;
}
case DRR_OBJECT_RANGE:
{
struct drr_object_range *drror =
&rrd->header.drr_u.drr_object_range;
dprintf("drr_type = OBJECT_RANGE firstobj = %llu "
"numslots = %llu flags = %u err = %d\n",
drror->drr_firstobj, drror->drr_numslots,
drror->drr_flags, err);
break;
}
default:
return;
}
#endif
}
/*
* Commit the records to the pool.
*/
static int
receive_process_record(struct receive_writer_arg *rwa,
struct receive_record_arg *rrd)
{
int err;
/* Processing in order, therefore bytes_read should be increasing. */
ASSERT3U(rrd->bytes_read, >=, rwa->bytes_read);
rwa->bytes_read = rrd->bytes_read;
if (rrd->header.drr_type != DRR_WRITE) {
err = flush_write_batch(rwa);
if (err != 0) {
if (rrd->abd != NULL) {
abd_free(rrd->abd);
rrd->abd = NULL;
rrd->payload = NULL;
} else if (rrd->payload != NULL) {
kmem_free(rrd->payload, rrd->payload_size);
rrd->payload = NULL;
}
return (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;
break;
}
case DRR_FREEOBJECTS:
{
struct drr_freeobjects *drrfo =
&rrd->header.drr_u.drr_freeobjects;
err = receive_freeobjects(rwa, drrfo);
break;
}
case DRR_WRITE:
{
err = receive_process_write_record(rwa, rrd);
if (err != EAGAIN) {
/*
* On success, receive_process_write_record() returns
* EAGAIN to indicate that we do not want to free
* the rrd or arc_buf.
*/
ASSERT(err != 0);
abd_free(rrd->abd);
rrd->abd = NULL;
}
break;
}
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;
break;
}
case DRR_FREE:
{
struct drr_free *drrf = &rrd->header.drr_u.drr_free;
err = receive_free(rwa, drrf);
break;
}
case DRR_SPILL:
{
struct drr_spill *drrs = &rrd->header.drr_u.drr_spill;
err = receive_spill(rwa, drrs, rrd->abd);
if (err != 0)
abd_free(rrd->abd);
rrd->abd = NULL;
rrd->payload = NULL;
break;
}
case DRR_OBJECT_RANGE:
{
struct drr_object_range *drror =
&rrd->header.drr_u.drr_object_range;
err = receive_object_range(rwa, drror);
break;
}
case DRR_REDACT:
{
struct drr_redact *drrr = &rrd->header.drr_u.drr_redact;
err = receive_redact(rwa, drrr);
break;
}
default:
err = (SET_ERROR(EINVAL));
}
if (err != 0)
dprintf_drr(rrd, err);
return (err);
}
/*
* 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;
fstrans_cookie_t cookie = spl_fstrans_mark();
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.
*/
int err = 0;
if (rwa->err == 0) {
err = receive_process_record(rwa, rrd);
} else if (rrd->abd != NULL) {
abd_free(rrd->abd);
rrd->abd = NULL;
rrd->payload = NULL;
} else if (rrd->payload != NULL) {
kmem_free(rrd->payload, rrd->payload_size);
rrd->payload = NULL;
}
/*
* EAGAIN indicates that this record has been saved (on
* raw->write_batch), and will be used again, so we don't
* free it.
*/
if (err != EAGAIN) {
if (rwa->err == 0)
rwa->err = err;
kmem_free(rrd, sizeof (*rrd));
}
}
kmem_free(rrd, sizeof (*rrd));
int err = flush_write_batch(rwa);
if (rwa->err == 0)
rwa->err = err;
mutex_enter(&rwa->mutex);
rwa->done = B_TRUE;
cv_signal(&rwa->cv);
mutex_exit(&rwa->mutex);
spl_fstrans_unmark(cookie);
thread_exit();
}
static int
resume_check(dmu_recv_cookie_t *drc, nvlist_t *begin_nvl)
{
uint64_t val;
objset_t *mos = dmu_objset_pool(drc->drc_os)->dp_meta_objset;
uint64_t dsobj = dmu_objset_id(drc->drc_os);
uint64_t resume_obj, resume_off;
if (nvlist_lookup_uint64(begin_nvl,
"resume_object", &resume_obj) != 0 ||
nvlist_lookup_uint64(begin_nvl,
"resume_offset", &resume_off) != 0) {
return (SET_ERROR(EINVAL));
}
VERIFY0(zap_lookup(mos, dsobj,
DS_FIELD_RESUME_OBJECT, sizeof (val), 1, &val));
if (resume_obj != val)
return (SET_ERROR(EINVAL));
VERIFY0(zap_lookup(mos, dsobj,
DS_FIELD_RESUME_OFFSET, sizeof (val), 1, &val));
if (resume_off != val)
return (SET_ERROR(EINVAL));
return (0);
}
/*
* 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, offset_t *voffp)
{
int err = 0;
struct receive_writer_arg *rwa = kmem_zalloc(sizeof (*rwa), KM_SLEEP);
if (dsl_dataset_is_zapified(drc->drc_ds)) {
uint64_t bytes;
(void) zap_lookup(drc->drc_ds->ds_dir->dd_pool->dp_meta_objset,
drc->drc_ds->ds_object, DS_FIELD_RESUME_BYTES,
sizeof (bytes), 1, &bytes);
drc->drc_bytes_read += bytes;
}
drc->drc_ignore_objlist = objlist_create();
/* 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);
ASSERT(dsl_dataset_phys(drc->drc_ds)->ds_flags & DS_FLAG_INCONSISTENT);
ASSERT0(drc->drc_os->os_encrypted &&
(drc->drc_featureflags & DMU_BACKUP_FEATURE_EMBED_DATA));
/* handle DSL encryption key payload */
if (drc->drc_featureflags & DMU_BACKUP_FEATURE_RAW) {
nvlist_t *keynvl = NULL;
ASSERT(drc->drc_os->os_encrypted);
ASSERT(drc->drc_raw);
err = nvlist_lookup_nvlist(drc->drc_begin_nvl, "crypt_keydata",
&keynvl);
if (err != 0)
goto out;
/*
* If this is a new dataset we set the key immediately.
* Otherwise we don't want to change the key until we
* are sure the rest of the receive succeeded so we stash
* the keynvl away until then.
*/
err = dsl_crypto_recv_raw(spa_name(drc->drc_os->os_spa),
drc->drc_ds->ds_object, drc->drc_fromsnapobj,
drc->drc_drrb->drr_type, keynvl, drc->drc_newfs);
if (err != 0)
goto out;
/* see comment in dmu_recv_end_sync() */
drc->drc_ivset_guid = 0;
(void) nvlist_lookup_uint64(keynvl, "to_ivset_guid",
&drc->drc_ivset_guid);
if (!drc->drc_newfs)
drc->drc_keynvl = fnvlist_dup(keynvl);
}
if (drc->drc_featureflags & DMU_BACKUP_FEATURE_RESUMING) {
err = resume_check(drc, drc->drc_begin_nvl);
if (err != 0)
goto out;
}
/*
* If we failed before this point we will clean up any new resume
* state that was created. Now that we've gotten past the initial
* checks we are ok to retain that resume state.
*/
drc->drc_should_save = B_TRUE;
(void) bqueue_init(&rwa->q, zfs_recv_queue_ff,
MAX(zfs_recv_queue_length, 2 * zfs_max_recordsize),
offsetof(struct receive_record_arg, node));
cv_init(&rwa->cv, NULL, CV_DEFAULT, NULL);
mutex_init(&rwa->mutex, NULL, MUTEX_DEFAULT, NULL);
rwa->os = drc->drc_os;
rwa->byteswap = drc->drc_byteswap;
rwa->resumable = drc->drc_resumable;
rwa->raw = drc->drc_raw;
rwa->spill = drc->drc_spill;
rwa->full = (drc->drc_drr_begin->drr_u.drr_begin.drr_fromguid == 0);
rwa->os->os_raw_receive = drc->drc_raw;
list_create(&rwa->write_batch, sizeof (struct receive_record_arg),
offsetof(struct receive_record_arg, node.bqn_node));
(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 drc->drc_rrd was never allocated, or it's later, and
* drc->drc_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 drc->drc_rrd and exit.
*/
while (rwa->err == 0) {
if (issig(JUSTLOOKING) && issig(FORREAL)) {
err = SET_ERROR(EINTR);
break;
}
ASSERT3P(drc->drc_rrd, ==, NULL);
drc->drc_rrd = drc->drc_next_rrd;
drc->drc_next_rrd = NULL;
/* Allocates and loads header into drc->drc_next_rrd */
err = receive_read_record(drc);
if (drc->drc_rrd->header.drr_type == DRR_END || err != 0) {
kmem_free(drc->drc_rrd, sizeof (*drc->drc_rrd));
drc->drc_rrd = NULL;
break;
}
bqueue_enqueue(&rwa->q, drc->drc_rrd,
sizeof (struct receive_record_arg) +
drc->drc_rrd->payload_size);
drc->drc_rrd = NULL;
}
ASSERT3P(drc->drc_rrd, ==, NULL);
drc->drc_rrd = kmem_zalloc(sizeof (*drc->drc_rrd), KM_SLEEP);
drc->drc_rrd->eos_marker = B_TRUE;
bqueue_enqueue_flush(&rwa->q, drc->drc_rrd, 1);
mutex_enter(&rwa->mutex);
while (!rwa->done) {
/*
* We need to use cv_wait_sig() so that any process that may
* be sleeping here can still fork.
*/
(void) cv_wait_sig(&rwa->cv, &rwa->mutex);
}
mutex_exit(&rwa->mutex);
/*
* If we are receiving a full stream as a clone, all object IDs which
* are greater than the maximum ID referenced in the stream are
* by definition unused and must be freed.
*/
if (drc->drc_clone && drc->drc_drrb->drr_fromguid == 0) {
uint64_t obj = rwa->max_object + 1;
int free_err = 0;
int next_err = 0;
while (next_err == 0) {
free_err = dmu_free_long_object(rwa->os, obj);
if (free_err != 0 && free_err != ENOENT)
break;
next_err = dmu_object_next(rwa->os, &obj, FALSE, 0);
}
if (err == 0) {
if (free_err != 0 && free_err != ENOENT)
err = free_err;
else if (next_err != ESRCH)
err = next_err;
}
}
cv_destroy(&rwa->cv);
mutex_destroy(&rwa->mutex);
bqueue_destroy(&rwa->q);
list_destroy(&rwa->write_batch);
if (err == 0)
err = rwa->err;
out:
/*
* If we hit an error before we started the receive_writer_thread
* we need to clean up the next_rrd we create by processing the
* DRR_BEGIN record.
*/
if (drc->drc_next_rrd != NULL)
kmem_free(drc->drc_next_rrd, sizeof (*drc->drc_next_rrd));
/*
* The objset will be invalidated by dmu_recv_end() when we do
* dsl_dataset_clone_swap_sync_impl().
*/
drc->drc_os = NULL;
kmem_free(rwa, sizeof (*rwa));
nvlist_free(drc->drc_begin_nvl);
if (err != 0) {
/*
* Clean up references. If receive is not resumable,
* destroy what we created, so we don't leave it in
* the inconsistent state.
*/
dmu_recv_cleanup_ds(drc);
nvlist_free(drc->drc_keynvl);
}
objlist_destroy(drc->drc_ignore_objlist);
drc->drc_ignore_objlist = NULL;
*voffp = drc->drc_voff;
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);
}
}
if (drc->drc_keynvl != NULL) {
error = dsl_crypto_recv_raw_key_check(drc->drc_ds,
drc->drc_keynvl, tx);
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, drc->drc_proc);
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, drc->drc_proc);
}
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);
boolean_t encrypted = drc->drc_ds->ds_dir->dd_crypto_obj != 0;
uint64_t newsnapobj;
spa_history_log_internal_ds(drc->drc_ds, "finish receiving",
tx, "snap=%s", drc->drc_tosnap);
drc->drc_ds->ds_objset->os_raw_receive = B_FALSE;
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);
}
}
if (drc->drc_keynvl != NULL) {
dsl_crypto_recv_raw_key_sync(drc->drc_ds,
drc->drc_keynvl, tx);
nvlist_free(drc->drc_keynvl);
drc->drc_keynvl = NULL;
}
VERIFY3P(drc->drc_ds->ds_prev, ==,
origin_head->ds_prev);
dsl_dataset_clone_swap_sync_impl(drc->drc_ds,
origin_head, tx);
/*
* The objset was evicted by dsl_dataset_clone_swap_sync_impl,
* so drc_os is no longer valid.
*/
drc->drc_os = NULL;
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;
newsnapobj =
dsl_dataset_phys(origin_head)->ds_prev_snap_obj;
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;
if (dsl_dataset_has_resume_receive_state(ds)) {
(void) zap_remove(dp->dp_meta_objset, ds->ds_object,
DS_FIELD_RESUME_FROMGUID, tx);
(void) zap_remove(dp->dp_meta_objset, ds->ds_object,
DS_FIELD_RESUME_OBJECT, tx);
(void) zap_remove(dp->dp_meta_objset, ds->ds_object,
DS_FIELD_RESUME_OFFSET, tx);
(void) zap_remove(dp->dp_meta_objset, ds->ds_object,
DS_FIELD_RESUME_BYTES, tx);
(void) zap_remove(dp->dp_meta_objset, ds->ds_object,
DS_FIELD_RESUME_TOGUID, tx);
(void) zap_remove(dp->dp_meta_objset, ds->ds_object,
DS_FIELD_RESUME_TONAME, tx);
(void) zap_remove(dp->dp_meta_objset, ds->ds_object,
DS_FIELD_RESUME_REDACT_BOOKMARK_SNAPS, tx);
}
newsnapobj =
dsl_dataset_phys(drc->drc_ds)->ds_prev_snap_obj;
}
/*
* If this is a raw receive, the crypt_keydata nvlist will include
* a to_ivset_guid for us to set on the new snapshot. This value
* will override the value generated by the snapshot code. However,
* this value may not be present, because older implementations of
* the raw send code did not include this value, and we are still
* allowed to receive them if the zfs_disable_ivset_guid_check
* tunable is set, in which case we will leave the newly-generated
* value.
*/
if (drc->drc_raw && drc->drc_ivset_guid != 0) {
dmu_object_zapify(dp->dp_meta_objset, newsnapobj,
DMU_OT_DSL_DATASET, tx);
VERIFY0(zap_update(dp->dp_meta_objset, newsnapobj,
DS_FIELD_IVSET_GUID, sizeof (uint64_t), 1,
&drc->drc_ivset_guid, tx));
}
/*
* 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. Since the dataset may be destroyed
* at this point (and therefore won't have a valid pointer to the spa)
* we release the key mapping manually here while we do have a valid
* pointer, if it exists.
*/
if (!drc->drc_raw && encrypted) {
(void) spa_keystore_remove_mapping(dmu_tx_pool(tx)->dp_spa,
drc->drc_ds->ds_object, drc->drc_ds);
}
dsl_dataset_disown(drc->drc_ds, 0, dmu_recv_tag);
drc->drc_ds = NULL;
}
static int dmu_recv_end_modified_blocks = 3;
static int
dmu_recv_existing_end(dmu_recv_cookie_t *drc)
{
#ifdef _KERNEL
/*
* We will be destroying the ds; make sure its origin is unmounted if
* necessary.
*/
char name[ZFS_MAX_DATASET_NAME_LEN];
dsl_dataset_name(drc->drc_ds, name);
zfs_destroy_unmount_origin(name);
#endif
return (dsl_sync_task(drc->drc_tofs,
dmu_recv_end_check, dmu_recv_end_sync, drc,
dmu_recv_end_modified_blocks, ZFS_SPACE_CHECK_NORMAL));
}
static int
dmu_recv_new_end(dmu_recv_cookie_t *drc)
{
return (dsl_sync_task(drc->drc_tofs,
dmu_recv_end_check, dmu_recv_end_sync, drc,
dmu_recv_end_modified_blocks, ZFS_SPACE_CHECK_NORMAL));
}
int
dmu_recv_end(dmu_recv_cookie_t *drc, void *owner)
{
int error;
drc->drc_owner = owner;
if (drc->drc_newfs)
error = dmu_recv_new_end(drc);
else
error = dmu_recv_existing_end(drc);
if (error != 0) {
dmu_recv_cleanup_ds(drc);
nvlist_free(drc->drc_keynvl);
} else {
if (drc->drc_newfs) {
zvol_create_minor(drc->drc_tofs);
}
char *snapname = kmem_asprintf("%s@%s",
drc->drc_tofs, drc->drc_tosnap);
zvol_create_minor(snapname);
kmem_strfree(snapname);
}
return (error);
}
/*
* 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);
}
/* BEGIN CSTYLED */
ZFS_MODULE_PARAM(zfs_recv, zfs_recv_, queue_length, INT, ZMOD_RW,
"Maximum receive queue length");
ZFS_MODULE_PARAM(zfs_recv, zfs_recv_, queue_ff, INT, ZMOD_RW,
"Receive queue fill fraction");
ZFS_MODULE_PARAM(zfs_recv, zfs_recv_, write_batch_size, INT, ZMOD_RW,
"Maximum amount of writes to batch into one transaction");
/* END CSTYLED */
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