Simdesk Technologies, Inc.

John M Eastman

John Thomas White, Jr

Chad Frederick Jones

Charles G Mattair, Jr

A file transfer system including a client and a server capable of updating portions of the file stored on the server. The system is capable of uploading portions of a file before the file has been specified at the client side. The files are stored in raw at the client and the server, which preserves the block list mapping. The file transfer protocol is capable of compressing and encrypting transferred data. As a result, the partial file writes are possible while maintaining current bandwidth usage. The write request data structure is provided with additional features in the form of flags and fields to provide reliable transmission of partial file data.

Secure block read and write protocol for remotely stored files

File systems which provide several different and improved locking capabilities. An application on a client workstation communicates through a client driver to a server which interfaces with a metadata database, which contains locking information about the files. Applications perform as normal. The client driver provides lock and unlock requests to the server when a write lock or a read with intent to write lock is required. If only a read lock is considered appropriate, the client driver does not provide a lock request. The server transparently performs read operations and read locking using the metadata database without specific requests from the client driver. When a read with intent to write or write lock is required, the lock ownership is placed with a given expiration time. When the time expires the lock is not automatically released but remains with the particular requesting client driver until another client driver requests it.

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Katy, TX, United States of America

John M Eastman