PURPOSE

        The FileSystem.resource is where boot disk drivers rendezvous
        to share file system code segments for partitions specified by
        dos type.  Prior to V36, it was created by the first driver
        that needed to use it.  For V36, its creation is ensured by the
        rom boot process.

   CONTENTS

        The FileSystem.resource is described in the include file
        resources/filesysres.h.  the nodes on it describe how to
        algorithmically convert the result of makedosnode (from the
        expansion.library) to a node appropriate for the dos type.

        filesysentry
            fse_Node            on fsr_FileSysEntries list
                                ln_Name is of creator of this entry
            fse_DosType         DosType of this FileSys: e.g. 0x444f5301
                                for the fast file system.
            fse_Version         high word is the version, low word is
                                the revision.
            fse_PatchFlags      bits set for those of the following that
                                need to be substituted into a standard
                                device node for this file system: e.g.
                                $180 for substitute SegList & GlobalVec
            fse_Type            device node type: zero
            fse_Task            standard dos "task" field
            fse_Lock            must be zero
            fse_Handler         for V36, if bit 31 is set, this is not
                                an AmigaDOS partition.
            fse_StackSize       stacksize to use when starting task
            fse_Priority        task priority when starting task
            fse_Startup         startup msg: filesysstartupmsg for disks
            fse_SegList         segment of code to run to start new task
            fse_GlobalVec       BCPL global vector when starting task

        no more entries need exist than those implied by fse_PatchFlags,
        so entries do not have a fixed size.  For V36, for example, the
        entry for the fast file system (fse_DosType 0x444f5301)
        contains a zero fse_PatchFlags, and thus no entries beyond that.