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System Relationships
Installable File System (IFS) Mechanism defines the relationships among
the operating system, the file systems, and the device drivers. The basic
model of the system is represented in Figure 1-1.
+-----------------------------------------------+
| |
| File System Request Router |
| |
+-------------------------------------+ |
| |
+--------+ +--------+ +--------+| |
| File | | File | | File || |
| System | | System | | System || |
| | | | | || |
| LOCAL | | NET | | NET || |
| | | REDIR1 | | REDIR2 || |
+--------+ +--------+ +--------+| |
+-------------------------------------+ |
| |
| FS Helper Routines/ |
| Device Driver Request Router |
| |
+-------------------------------------+ |
| |
+--------+ +--------+ +--------+| |
| | | | | || |
| Device | | Device | | Device || |
| Driver | | Driver | | Driver || |
| | | | | || |
+--------+ +--------+ +--------+| |
+-------------------------------------+ |
| |
| Device Driver Helper Routines |
| |
+-----------------------------------------------+
Figure 1-1. System relationships for Installable File Systems
The file system request router directs file system function calls to the
appropriate file system for processing.
The file systems manage file I/O and control the format of information on
the storage media. An installable file system (FS) will be referred to as
a file system driver (FSD).
The FS Helper Routines provide a variety of services to the file systems.
The device drivers manage physical I/O with devices. Device drivers do not
understand the format of information on the media.
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