File operations with multiple level file locking techniques

Details File operations with multiple level file locking techniques File operations with multiple level file locking techniques

2006-12-11

2010-06-22

Ehichioya, Fred I (Department: 2156)

Data processing: database and file management or data structures

Data integrity

Concurrent read/write management using locks

C707S999008, C707S999100, C707S999200, C709S210000

Reexamination Certificate

active

07743039

ABSTRACT:
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.

REFERENCES:
patent: 6178440 (2001-01-01), Foster et al.
patent: 2003/0105755 (2003-06-01), Daynes
patent: WO 89/03086 (1988-01-01), None

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