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Introduce a flag to skip comparing the local mac when raw sending

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Raw receiving a snapshot back to the originating dataset is currently
impossible because of user accounting being present in the originating
dataset.

One solution would be resetting user accounting when raw receiving on
the receiving dataset. However, to recalculate it we would have to dirty
all dnodes, which may not be preferable on big datasets.

Instead, we rely on the os_phys flag
OBJSET_FLAG_USERACCOUNTING_COMPLETE to indicate that user accounting is
incomplete when raw receiving. Thus, on the next mount of the receiving
dataset the local mac protecting user accounting is zeroed out.
The flag is then cleared when user accounting of the raw received
snapshot is calculated.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: George Amanakis <gamanakis@gmail.com>
Closes #12981 
Closes #10523
Closes #11221
Closes #11294
Closes #12594
Issue #11300
This commit is contained in:
George Amanakis
2022-01-21 20:41:17 +01:00
committed by Tony Hutter
parent 1009e60992
commit e257bd481b
7 changed files with 163 additions and 14 deletions
Download Patch File Download Diff File Expand all files Collapse all files
module/zfs/dnode_sync.c
+7 -2
View File
@@ -655,8 +655,13 @@ dnode_sync(dnode_t *dn, dmu_tx_t *tx)
DNODE_FLAG_USEROBJUSED_ACCOUNTED;
mutex_exit(&dn->dn_mtx);
dmu_objset_userquota_get_ids(dn, B_FALSE, tx);
} else {
/* Once we account for it, we should always account for it */
} else if (!(os->os_encrypted && dmu_objset_is_receiving(os))) {
/*
* Once we account for it, we should always account for it,
* except for the case of a raw receive. We will not be able
* to account for it until the receiving dataset has been
* mounted.
*/
ASSERT(!(dn->dn_phys->dn_flags &
DNODE_FLAG_USERUSED_ACCOUNTED));
ASSERT(!(dn->dn_phys->dn_flags &
module/zfs/dsl_crypt.c
+1 -8
View File
@@ -2007,14 +2007,6 @@ dsl_crypto_recv_raw_objset_check(dsl_dataset_t *ds, dsl_dataset_t *fromds,
if (ret != 0)
return (ret);
/*
* Useraccounting is not portable and must be done with the keys loaded.
* Therefore, whenever we do any kind of receive the useraccounting
* must not be present.
*/
ASSERT0(os->os_flags & OBJSET_FLAG_USERACCOUNTING_COMPLETE);
ASSERT0(os->os_flags & OBJSET_FLAG_USEROBJACCOUNTING_COMPLETE);
mdn = DMU_META_DNODE(os);
/*
@@ -2106,6 +2098,7 @@ dsl_crypto_recv_raw_objset_sync(dsl_dataset_t *ds, dmu_objset_type_t ostype,
arc_release(os->os_phys_buf, &os->os_phys_buf);
bcopy(portable_mac, os->os_phys->os_portable_mac, ZIO_OBJSET_MAC_LEN);
bzero(os->os_phys->os_local_mac, ZIO_OBJSET_MAC_LEN);
os->os_flags &= ~OBJSET_FLAG_USERACCOUNTING_COMPLETE;
os->os_next_write_raw[tx->tx_txg & TXG_MASK] = B_TRUE;
/* set metadnode compression and checksum */