File System Sync Event Validation for Cloud Data Integrity

The patent applies preliminary action by generating and storing events for steady-state synchronization before performing rescan synchronization. These pre-generated events serve as a reference to validate delete operations during rescan, preventing premature or incorrect deletions. The system prepares validation data in advance (events from steady-state sync) that can be used to verify the correctness of delete operations during the rescan process, thereby preventing data loss before it occurs.

The patent implements feedback by validating rescan delete events against previously generated steady-state synchronization events. The system checks whether delete events detected during rescan are confirmed by corresponding events in the steady-state event log. This feedback mechanism allows the system to identify and fence (block) invalid delete operations that would otherwise cause data loss, ensuring that only verified delete operations are applied to the remote file system.

The system performs preliminary action by generating events during steady-state synchronization that record all file system operations. These pre-recorded events create an authoritative log of what operations should have occurred. During rescan synchronization, this pre-generated event log serves as the ground truth against which detected delete operations are validated, enabling the system to distinguish between valid and invalid deletes with high precision.

The patent uses an intermediary mechanism by introducing an event validation layer between the rescan delete detection and the actual delete execution. The steady-state events act as an intermediary reference that mediates the validation process. When a delete event is detected during rescan, the system consults the intermediary event log to verify its validity before applying the delete operation, thereby preventing unintended data loss while maintaining synchronization accuracy.

The patent applies copying by creating a copy of the file system state through event logging during steady-state synchronization. Instead of directly comparing file system states during rescan (which would be complex), the system copies the operational history into an event log. This event copy serves as a simplified reference structure that can be efficiently queried to validate delete operations, reducing the complexity of the validation process while maintaining data integrity.

The system discards invalid delete events by fencing them (blocking their execution) when validation fails. The patent recovers from potential data loss by identifying invalid deletes through validation and preventing their execution. This discard and recover mechanism allows the system to maintain simplicity in the validation logic (just check event presence) while ensuring data integrity through the fencing of invalid operations.