Open systems file system (QOpenSys)

 

The QOpenSys file system is compatible with open system standards based on UNIX^®, such as POSIX and X/Open Portability Guide (XPG). Like the "root" (/) file system, this file system takes advantage of the stream file and directory support that is provided by the integrated file system.

In addition, it:

• Is accessed through a hierarchical directory structure similar to UNIX systems.

• Is optimized for stream file input and output.

• Supports multiple hard links and symbolic links.

• Supports case-sensitive names.

• Supports local sockets.

• Supports threadsafe APIs.

• Supports *FIFO objects.

• Supports the journaling of object changes.

• Supports the scanning of objects using the integrated file system scan-related exit points.

The QOpenSys file system has the same characteristics as the "root" (/) file system, except it is case-sensitive to enable support for UNIX-based open systems standards.

 

Accessing QOpenSys

QOpenSys can be accessed through the integrated file system interface using either the i5/OS^® file server or the integrated file system commands, user displays, and APIs.

• Case-sensitivity in the QOpenSys file system
  Unlike the "root" (/) file system, the QOpenSys file system distinguishes between uppercase or lowercase characters when searching for object names.

• Path names in the QOpenSys file system
  Path names have specific form in the QOpenSys file system.

• Links in the QOpenSys file system
  Multiple hard links to the same object are allowed in the QOpenSys file system. Symbolic links are fully supported.

• Integrated file system commands and displays in the QOpenSys file system
  All of the commands that are listed in the Accessing using CL commands topic and the displays that are described in the Accessing using menus and displays topic can operate on the QOpenSys file system. However, it may not be safe to use these commands in a multi-thread capable process.

• Integrated file system APIs in the QOpenSys file system
  All the APIs listed in the Performing operations using APIs topic can operate on the QOpenSys file system.

• Object changes journaling in the QOpenSys file system
  Objects in the QOpenSys file system can be journaled. This function enables you to recover the changes to an object that have occurred since the object was last saved.

 

Parent topic:

File systems