1. installable file system system> IFS or "File System Driver", "FSD" An API that allows you to extend OS/2 to access files stored on disk in formats other than FAT and HPFS, and access files that are stored on a network file server. For example an IFS could provide programs running under OS/2 including DOS and Windows programs with access to files stored under Unix using the Berkeley fast file system. The other variety of IFS a "remote file system" or "redirector" allows file sharing over a LAN, e. g. using Unixs Network File System protocol. In this case, the IFS passes a programs file access requests to a remote file server, possibly also translating between different file attributes used by OS/2 and the remote system. Documentation on the IFS API has been available only by special request from IBM. An IFS is structured as an ordinary 16-bit DLL with entry points for opening, closing, reading, and writing files, the swapper, file locking, and Universal Naming Convention. The main part of an IFS that runs in ring 0 is called by the OS/2 kernel in the context of the callers process and thread. The other part that runs in ring 3 is a utility library with entry points for FORMAT, RECOVER, SYS, and CHKDSK. EDM/2 article http://www. edm2. com/0103/.
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