> How it got that way, I couldn't really say without looking at your code.
It works like this:
In new ioctl operation
zfs_ioc_replicate_send(zfs_cmd_t *zc)
we open filesystem ( not snapshot )
dmu_objset_open(zc->zc_name, DMU_OST_ANY,
DS_MODE_STANDARD | DS_MODE_READONLY, &filesystem);
call dmu replicate send function
dmu_replicate_send(filesystem, &txg, ...);
( txg - is tranzaction group number )
we set max_txg
ba.max_txg = (spa_get_dsl(filesystem->os->os_spa))->dp_tx.tx_synced_txg;
and call traverse_dsl_dataset
traverse_dsl_dataset(filesystem->os->os_dsl_dataset, *txg,
ADVANCE_PRE | ADVANCE_HOLES | ADVANCE_DATA | ADVANCE_NOLOCK,
replicate_cb, &ba);
after traversing next txg is returned
if (ba.got_data != 0)
*txg = ba.max_txg + 1;
in replicate_cb we do the same what backup_cb does, but at the beginning we
are checking txg:
/* remember last txg */
if (bc->bc_blkptr.blk_birth) {
if (bc->bc_blkptr.blk_birth > ba->max_txg) return;
ba->got_data = 1;
}
After 5 seconds delay we call ioctl with txg returned from last operation.
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