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d1f73ce429
Route IRP_MJ_FLUSH_BUFFERS through EncryptedIoQueue for mounted writable non-system volumes. Flushes are represented as zero-length queue items handled by the I/O thread, so ZwFlushBuffersFile runs after earlier encrypted write fragments before completing to the caller. Also perform a best-effort ZwFlushBuffersFile before closing writable mounted-volume host handles, after the encrypted I/O queue has drained, so clean dismount/shutdown paths push the host file or raw device before close. This keeps the change focused on ordinary mounted-volume flush ordering and avoids system-encryption, boot-drive, and header-update paths.