rfc122.txt

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Network Working Group                                     James E. White
Request for Comments: 122                               UC Santa Barbara
NIC 5834                                                   26 April 1971


                   NETWORK SPECIFICATIONS FOR UCSB's

                       SIMPLE-MINDED FILE SYSTEM


                                CONTENTS
                                                               Page

          I.   Preface........................................   3

         II.   Implementation.................................   3

        III.   Login..........................................   3

         IV.   Service Offered................................   4

          V.   Primitive File Operations......................   6

               V.A.  Allocate File (ALF)......................   6

               V.B.  Update File (UDF)........................   7

               V.C.  Replace File (RDF).......................   8

               V.D.  Retrieve File (RTF)......................   9

               V.E.  Space File (SPF).........................   9

               V.F.  Delete File (DLF)........................  10

               V.G.  Rename File (RNF)........................  10

               V.H.  File No Operation (FNO)..................  10

               V.I.  No Operation (NOP).......................  11

         VI.   Input Stream Format............................  11

        VII.   Output Stream Format...........................  16







J. White                                                        [Page 1]

RFC 122                Simple-Minded file System              April 1971


        FIGURES
                                                               Page

        Figure 1.  Filename/Password Character Sets...........   5

        Figure 2.  Command Op Codes...........................  12

        Figure 3.  Defined Command Fields.....................  13

        Figure 4.  Definition of Command FLAGS Bits...........  14

        Figure 5.  Defined Command Response Fields............  18

        Figure 6.  Completion Codes...........................  19





































J. White                                                        [Page 2]

RFC 122                Simple-Minded file System              April 1971


I.   Preface

   UCSB will provide file storage for Network users.  UCSB's Simple
   Minded File System (SMFS) is addressed as socket number X'401', site
   3.  No accounting parameters are required.  This document is intended
   to provide programmers with the information necessary to communicate
   with SMFS which conducts all Network transactions trough its NCP
   which operates under the Host-Host protocol of August 3, 1970.*

II.  Implementation

   The following information is not essential to use of SMFS but may be
   of interest.  SMFS will store user's files on IBM 2316 disk packs,
   each with 29M 8-bit bytes of storage capacity.  UCSB has two 2314
   units, each with eight drives on-line.  Initially, one drive will be
   allocated for Network storage, and the appropriate pack will always
   be mounted an that drive, and hence accessible to SMFS without
   operator intervention.  UCSB estimates that for the next year it will
   have up to four drives that it can devote to Network use.  The
   second, third, and fourth drives will be allocated only as the need
   arises.  SMFS is written to accommodate any number of on-line drives
   without modification.

   If necessary, UCSB will investigate the possibility of making one of
   the four drives a come-and-go drive on which one of a number of packs
   can be mounted as required.  Hence, the potential exists for
   increased storage capacity with an accompanying increase in access
   time.

   Files stored with SMFS will be backed up to tape daily.  The back-up
   tape(s) will be off-line and available only in case the on-line
   copies are destroyed.

   In no sense does USB expect to become _the_ file storage node of the
   Network; it hasn't the capacity.  UCSB _is_ equipped, however, to
   make a limited amount of secondary storage immediately available to
   the Network community.

III.  Login

   SMFS can simultaneously service any number of Network users up to
   some assembly-parameters maximum (currently ten).  A potential user
   must establish a pair of Network connections

*At the time of this writing, the NCP modifications of RFC #107 have not
as yet been implemented at UCSB.





J. White                                                        [Page 3]

RFC 122                Simple-Minded file System              April 1971


   (i.e., one full-duplex connection) to SMFS by executing a standard
   ICP to socket X'401', site 3.  SMFS always listens on that socket.
   It will accept any call it receives -- say from the user's receive
   socket 'm' -- and over the connection thus established transmit a
   32-bit receive socket number (call it 'n'), and then close the
   connection.  SMFS will then issue two connection requests -- one
   involving its receive socket 'n' and the user's send socket 'm+l', in
   other involving its send socket 'n+l' and the user's receive socket
   'm'.  Once these two connections have been established, the user will
   be considered logged in.  A deviation from the Initial Connection
   Protocol will occur only if SMFS or its NCP has insufficient
   resources to support another connection.

   SMFS will maintain its connections to the user indefinitely.  It will
   voluntarily terminate its connections to the user only if (1) a bad
   op code is encountered in a user command (see Section VI), or (2)
   closing one of the connections is required to signal end-of-data (see
   Section V.D.).  Barring such an occurrence, the user should close his
   connections to SMFS when through, at which time SMFS will consider
   the user logged out.

   In the discussion to follow, the following terms are used.  The
   connections on which the user transmits data to and receives data
   from SMFS are designated the input and output connections,
   respectively (i.e., SMFS's rather than the user's point of view is
   adopted).  The string of bits which passes from the user to SMFS over
   the input connection during the life of that connection is called the
   _input stream_; the string of bits which passes from SMFS to the user
   over the output connection during the life of that connection is
   called the _output stream_.

IV.  Service Offered

   SMFS will provide storage for sequential, binary files of length
   greater than or equal to an assembly-parameter minimum (currently one
   bit) and less than or equal to an assembly-parameter maximum
   (currently 25 million bits).  There is no restriction on the contents
   of the file.

   Every file stored with SMFS has a _filename_, which may be any string
   of from one to 36, 8-bit characters chosen from the set:

        { A,...,Z,0,...9,blank }








J. White                                                        [Page 4]

RFC 122                Simple-Minded file System              April 1971


   Graphic              EBCDIC Code (Hex)    ASCII Code (Hex)

   UC     LC                UC     LC            UC     LC

   A     a                  C1     81            41     61
   B     b                  C2     82            42     62
   C     c                  C3     83            43     63
   D     d                  C4     84            44     64
   E     e                  C5     85            45     65
   F     f                  C6     86            46     66
   G     g                  C7     87            47     67
   H     h                  C8     88            48     68
   I     i                  C9     89            49     69
   J     j                  D1     91            4A     6A
   K     k                  D2     92            4B     6B
   L     l                  D3     93            4C     6C
   M     m                  D4     94            4D     6D
   N     n                  D5     95            4E     6E
   O     o                  D6     96            4F     6F
   P     p                  D7     97            50     70
   Q     q                  D8     98            51     71
   R     r                  D9     99            52     72
   S     s                  E2     A2            53     73
   T     t                  E3     A3            54     74
   U     u                  E4     A4            55     75
   V     v                  E5     A5            56     76
   W     w                  E6     A6            57     77
   X     x                  E7     A7            58     78
   Y     y                  E8     A8            59     79
   Z     z                  E9     A9            5A     7A


   0     -                  F0      -             30     -
   1     -                  F1      -             31     -
   2     -                  F2      -             32     -
   3     -                  F3      -             33     -
   4     -                  F4      -             34     -
   5     -                  F5      -             35     -
   6     -                  F6      -             36     -
   7     -                  F7      -             37     -
   8     -                  F8      -             38     -
   9     -                  F9      -             39     -

   blank -                  40      -             20     -

                                 Figure 1

                     Filename/Password Character Sets



J. White                                                        [Page 5]

RFC 122                Simple-Minded file System              April 1971


   Filenames may be specified by the user in either EBCDIC or ASCII (see
   Figure 1), and the characters A,...,Z may be either upper- or lower-
   case.  However, the acceptance by SMFS of both upper- and lower-case,
   and both EBCDIC and ASCII, is provided only as a convenience to the
   user.  In particular, such distinctions don't increase the number of
   unique filenames that can be generated; the filenames 'FILE NUMBER 1'
   and 'file number 1', in EBCDIC or ASCII, designate the same file.

   Every file stored with SMFS may optionally be protected against