What does NTSTATUS 0xC0190047 (STATUS_NOT_SNAPSHOT_VOLUME) mean?

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The TxF operation requires a snapshot-mounted volume.

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STATUS_TRANSACTION_FREEZE_IN_PROGRESS	STATUS_NO_SAVEPOINT_WITH_OPEN_FILES

STATUS_NOT_SNAPSHOT_VOLUME

The operation expects a snapshot-mounted volume

STATUS_NOT_SNAPSHOT_VOLUME indicates that the caller used a TxF operation that is valid only for a volume mounted as a snapshot volume. The target may be an ordinary mounted NTFS volume, but the requested control path expects snapshot semantics.

This can occur in backup, restore, or volume-shadow-copy related code that mixes handles from the live volume with handles intended for a snapshot view.

What to check

Whether the handle actually points to the snapshot volume, not the original live volume.
Volume mount paths, device paths, and reparse points used by backup or restore code.
Whether FSCTL_TXFS_TRANSACTION_ACTIVE or similar snapshot-only logic is being used on the wrong handle.
Whether the snapshot was created and mounted before the TxF query was issued.

Useful distinction

This is a volume-context error. It does not say that the transaction itself is invalid; it says the operation was aimed at a volume view that lacks the required snapshot role.

References

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