MFSYS(4)             INTERACTIVE UNIX System             MFSYS(4)



          NAME
               mfsys  -  file format

          SYNOPSIS
               mfsys

          DESCRIPTION
               The mfsys file contains configuration information for file
               system types that are to be included in the next system ker-
               nel to be built.  It is included in the directory
               /etc/conf/cf.d, and includes a one-line description of each
               file system type.  The mfsys file is coalesced from com-
               ponent files in the directory /etc/conf/mfsys.d. Each line
               contains the following whitespace-separated fields:

               1.   name:  This field contains the internal name for the
                    file system type (e.g., S51K, DUFST).  This name is no
                    more than 32 characters long, and by convention is com-
                    posed of uppercase alphanumeric characters.

               2.   prefix:  The prefix in this field is the string
                    prepended to the fstypsw handler functions defined for
                    this file system type (e.g., s5, du).  The prefix must
                    be no more that 8 characters long.

               3.   flags:  The flags field contains a hex number of the
                    form "0xNN" to be used in populating the fsinfo data
                    structure table entry for this file system type.

               4.   notify flags:  The notify flags field contains a hex
                    number of the form "0xNN" to be used in population the
                    fsinfo data structure table entry for this file system
                    type.

               5.   function bitstring:  The function bitstring is a string
                    of 28 0's and 1's.  Each file system type potentially
                    defines 28 functions to populate the fstypsw data
                    structure table entry for itself.  All file system
                    types do not supply all the functions in this table,
                    however, and this bitstring is used to indicate which
                    of the functions are present and which are absent.  A
                    '1' in this string indicates that a function has been
                    supplied, and a '0' indicates that a function has not
                    been supplied.  Successive characters in the string
                    represent successive elements of the fstypsw data
                    structure, with the first entry in this data structure
                    represented by the rightmost character in the string.

          SEE ALSO
               sfsys(4).
               idinstall(1M), idbuild(1M) in the INTERACTIVE UNIX System
               User's/System Administrator's Reference Manual.



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