Changes between Version 2 and Version 3 of FSDesign

Timestamp:

2009-07-13T09:12:19Z (15 years ago)

Author:

Jakub Jermář

Comment:

—

FSDesign

@@ -28 +28 @@
 functionality by any other means. Each file system request forwarded to VFS
 is composed of one or more IPC phone calls.
+
+== VFS server == #FSDesignVFS
+
+The VFS server is the focal point of and also the most complex element of
+the file system support in the HelenOS operating system. It exists as a
+standalone user task. We can talk about the VFS frontend and VFS backend.
+
+The frontend is responsible for accepting requests from the client tasks.
+Their arguments are either absolute file paths, file handles of already
+opened files, and in some special cases also VFS triplets (see below).
+
+If the argument is a file path, VFS uses the ''vfs_lookup_internal()'' function to
+translate the path into the so called VFS triplet. A VFS triplet is an ordered
+triplet containing a global handle of the file system instance, a global device
+handle and a file index. Thus a VFS triplet uniquely identifies a file on
+some file system instance.
+