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* The byte-range advisory Network Lock Manager ( NLM ) protocol ( added to support UNIX System V file locking APIs ).
* byte-range requests for streaming and resumption of downloads
# using byte-range locks to arbitrate read and write access to regions within a single file
For a file with shared access, applications may then use byte-range locking to control access to specific regions of the file.
Such byte-range locks specify a region of the file ( offset and length ) and the type of lock ( shared or exclusive ).
For applications that use the file read / write APIs in Windows, byte-range locks are enforced ( also referred to as mandatory locks ) by the file systems that execute within Windows.
For applications that use the file mapping APIs in Windows, byte-range locks are not enforced ( also referred to as advisory locks.
For example, the Windows file-sharing mechanism will typically disable client side caching of a file for all clients when byte-range locks are used on any client to control file access.
Improper error-handling in an application program can lead to a scenario where a file is locked ( either using " share " access or with byte-range file locking ) and cannot be accessed by other applications.
Kernel 2. 6. 12 and above implement < tt > flock </ tt > calls on NFS files using POSIX byte-range locks.
File data locks are managed by the OST on which each object of the file is striped, using byte-range extent locks.

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