Installable File System

The Installable File System Framework is an operating system component that allows application programs through a central interface only see a file system and have to deal with it, even if the operating system it needs to access different file systems on different drivers.

Situation IFS

In MS -DOS, there is no such a framework, application programs using the operating system call INT 21H to use the FAT file system. A driver of another file system must redirect this call to, then check whether it is responsible for editing ( permitted access to a file that is located in its file system ), and execute the call - or (for non - responsible ) the pass call to the original processing routine. If several such drivers to be loaded, there may be difficulties:

  • Or not a driver A for a call for " responsible " without being there, the call will usually fail and the actually competent driver B has no opportunity - the faulty driver A earlier in the "chain" is not enough to call further.
  • Hooks is a one driver at the beginning of the chain, but directs (with non- charge ) all or not correctly following driver on, so they are cut off.

Common driver for this file system driver chain are drivers for CD -ROM file systems (also DVD etc.) and "Network Redirector" driver, show which network resources as local drives.

Introduction of IFS

Under Windows 3.x DOS both above methodology is possible, as well as two Network Redirector, one of the "Microsoft Windows Network Redirector" needs to be.

Only Microsoft Windows 95 ( and IBM OS / 2), all file system accesses were summarized in the Installable File System ( IFS) Manager who can manage any number of drivers for local drives / file systems and network overlays.

Swell

  • Microsoft.com: Windows 95 Architecture Components, see " Installable File System" and the following
  • Microsoft.com: Windows 95 Network Architecture Overview
  • File system
Software framework MS-DOS
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