Method for controlling file request access

Patent metadata

Field	Value
Publication number	US-8949296-B2
Application number	US-201213686237-A
Country	US
Kind code	B2
Filing date	Nov 27, 2012
Priority date	Nov 28, 2011
Publication date	Feb 3, 2015
Grant date	Feb 3, 2015

Abstract

A mirror file number corresponding to a file being requested is transmitted to a host OS. A determination is made as to whether or not caching is performed in the host OS, and reading of the data of the mirror file number is requested to a block device if it is determined that the data of the mirror file number that was transmitted is not cached. The block device acquires the memory address where the corresponding actual contents are stored, corresponding to the sector number, acquires the sequence number corresponding to the contents, changes the acquired sequence number, and reads the data of the acquired memory address. The read data is converted to data with a modified sequence number attached, and the data is provided to the host OS. If it is determined that the data is cached in the host OS, the cached data is provided.

First claim

What is claimed is:

1. A method of performing a file request access by a user application running on a host operating system (OS) of a programmed computing device, comprising:
receiving at the host OS, from the user application, a sequence number corresponding to the requested file;
determining, by the host OS, whether the requested file is a mirror file, the determining including:
identifying a sector number of the requested file;
accessing a mirror file entry table (MFET) w…

Assignees

• IBM

Inventors

• Katayama Yasunao
• Ohba Nobuyuki
• Takano Kohji

Classifications

• G06F16/172 Primary

  Physics · mapped topic

• G06F17/30132 Primary

  Physics · mapped topic