Patent Number: 7,769,779

Title: Reverse name mappings in restricted namespace environments

Abstract: A silo-specific view of the file system is provided to processes running in the silo. Processes can access a file only by uttering the silo-relative name. To determine if access to a file identified by a file ID should be permitted, a list of physical names of the file identified by the file ID is constructed. If a silo-relative name that translates to a name in the list can be uttered, the file is opened and the file ID for the opened file is retrieved. If the file IDs match, the silo-relative name is used to open the file. If a process running within a silo requests a list of names for a file that has been opened using a file ID, results returned are filtered so that only names visible in the silo are returned, thus restricting the process' access to files to those files within its hierarchical namespace.

Inventors: Havens; Jeffrey L. (Issaquah, WA), Smith; Frederick J. (Redmond, WA), Khalidi; Yousef A. (Bellevue, WA), Talluri; Madhusudhan (Bellevue, WA)

Assignee: Microsoft Corporation

International Classification: G06F 17/30 (20060101)

Expiration Date: 8/03/12018