What does Windows error code 385 (ERROR_FILE_SYSTEM_VIRTUALIZATION_INVALID_OPERATION) mean?

 
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ERROR_SMB1_NOT_AVAILABLE ERROR_CLOUD_FILE_AUTHENTICATION_FAILED

ERROR_FILE_SYSTEM_VIRTUALIZATION_INVALID_OPERATION

The projected item state does not permit this virtualization operation

ProjFS items move through distinct on-disk states: virtual, placeholder, hydrated or full, and potentially locally modified. Operations such as updating or deleting a placeholder have rules that protect dirty content and open handles. This error means the requested transition conflicts with the current object state, not that virtualization is globally unavailable.

Query the file state before changing the provider view. A provider may need to leave a locally modified full file untouched, use PrjUpdateFileIfNeeded with the correct version information, or postpone deletion until handles close. Diagnose the exact failure cause returned by the ProjFS update/delete API. Forcing ordinary file operations around the provider can discard local changes or leave the projected view inconsistent.

What to inspect

  • Query the current placeholder and cache state.
  • Check open handles and local modifications before replacing data.
  • Use the ProjFS update/delete API and inspect its failure cause.

References


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