Mac OS 8.5 Technote: Part XXII Copyright 1998 by Apple Computer, Inc. All Rights Reserved. [Previous section] [Mac OS 8.5 Contents Page] [Next section]

Inside the System File (Continued) File System Manager The File System Manager provides a general means by which foreign file systems can be installed, identified, and interfaced to the operating system. XGetVolInfo requests (like GetVolInfo requests) to a FSM-based file system are now passed a working directory number or the default volume number (the value zero) in ioVRefNum if the File Manager caller used a working directory number or the default volume number. Under Mac OS 8.1, ioVRefNum would always contain the real volume reference number when passed to a FSM-based file system. This change lets the FSM-based file system determine what to return in ioVNmFls correctly. UTTrashBlocks now correctly returns an OSErr result (either noErr, rfNumErr, or fnOpnErr). Before Mac OS 8.5, UTTrashBlocks returned the file reference number passed in as the fileRefNum parameter. The File Manager's disk cache now range-checks the buffer parameter passed to UTReleaseBlock and UTMarkDirty. If the buffer parameter is bad, those calls will no longer crash the system. Related Materials: The File Manager section. The File System Manager 1.2 SDK

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