System for accessing extended object attribute (EA) data through

Details System for accessing extended object attribute (EA) data through System for accessing extended object attribute (EA) data through

1990-09-25

1994-11-22

Lee, Thomas C.

Boots, shoes, and leggings

395700, 364DIG1, 364280, 3642823, 3642831, G06F 1202

Patent

active

053676718

ABSTRACT:
An adaptation of a computer operating system manages storage of EA (extended attribute) data in association with object names, the latter representing paths in direct access storage devices (e.g. directories and sub-directories), and data files stored in such paths. EA data stored in association with a data file name can be accessed either jointly with or separate from the respective data file. EA data comprises one or more variable length sets of bytes stored in disk drive sectors assigned by the operating system. The location of each set is determinable by means of an EA handle that is stored in a path table containing the respective object name. Function calls from application programs to the operating system use either a file name or EA handle to access EA data. Function calls specifying only an EA handle allow EA information to be stored, modified or read without specific association to or linkage with file data. Function calls specifying a file name allow EA information to be stored, modified or read either separately from or jointly with associated file data ("jointly with" meaning for instance that a call to copy or delete a named file could be used to effect copying or deletion of both file data and associated EA data).

REFERENCES:
patent: 5075848 (1991-12-01), Lai et al.
patent: 5206951 (1993-04-01), Khoyi et al.
Duncan R., Design Goals and Implementation of the New High Performance File System, Microsoft Systems Journal, Sep. 1989 p. 1(13).
Duncan R, Using long filenames and extended attributes pt. 1 PC Magazine Apr. 24, 1990 p. 317(5).
Duncan R, Using long filenames and extended attributes pt. 2 PC Magazine May 15, 1990 p. 305(5).
Duncan, R. The MS-DOS Encyclopedia, Microsoft Press 1988, pp. 97-103, 150-154, 247-279.
IBM, OS/Z Programming Tools and Information v. 1.2 Control Program Programming Reference, (1989).
IBM OS/Z Programming Tools and Information v. 1.2 Programming Guide (1989).

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