File system questionnaire
RFC 180

Document Type RFC - Unknown (June 1971; No errata)
Last updated 2013-03-02
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Network Working Group                                     Alex McKenzie
Request for Comments #180                                 BBN
NIC #7123                                                 25 June 1971
Categories: D.7, G.3
Updates: none
Obsoletes: none

                       File System Questionnaire

As noted in RFC #164 (page 35), a subcommittee of the NWG, under the
chairmanship of Abhay Bhushan, is currently generating proposals for a
"data transfer protocol" and a "file transfer protocol".

The subcommittee has decided that the file transfer protocol should
provide standard methods for requesting the transfer of a file but
should not, at this time, attempt to standardize file naming
conventions, access control conventions, and the like.  Thus a user
who is, for example, trying to store a file on a remote Host will be
required to use the file naming conventions appropriate to the remote
Host.

Given the above point of view, it becomes imperative for users to have
some source of information about Host file conventions.  Such
information, once compiled, will also serve as input to possible
standardization efforts of the file transfer subcommittee.  For this
reason Abhay has asked me to solicit information on file conventions
from the Host organizations.  What follows is a description of the
kinds of information of interest.  I am well aware of the fact that
many of you are tired of writing system descriptions; Xerox copies of
short sections of your local documentation are fine if the result is
complete and comprehensible.  (In the case that your Host will never
permit network use of your file system, a note to that effect would be
sufficient.)

                         Information Requested

1.  File naming conventions - We (loosely) define a pathname to be
    the data string which must be input to the file system by a user
    (a network user if your system makes a distinction between local
    and network users) in order to identify a file.  We are interested
    in syntax, semantics, and defaults.  Typical components of pathnames
    are:

         - "device" fields
         - user names
         - version numbers
         - index names
         - punctuation marks

                                                                [Page 1]
Common types of defaults are:

         - device is disk
         - version number is largest in system

    For hierarchical file structures, descriptions may be fairly
    complex, but with lots of defaults; in such cases an illustration
    of a "normal" pathname might be helpful.

2.  Access control mechanisms - Access control mechanisms range from
    simply knowledge of a file's pathname to elaborate hierarchies
    of group-project-task-username membership with passwords and
    separate controls for reading and writing.  There are two
    aspects of the access control mechanism which are of interest:

    a.  A description of what inputs the user should give the file
        system, both at the time of file creation and at the time of
        retrieval, in order to define the permitted modes of access
        and to gain access.  What are the syntax and semantics of
        these inputs?

    b.  A description of the ways in which the access control
        mechanism is designed to help (or hinder) the sharing of
        files.  For example, may two users "simultaniously" update a
        given file?  May the creator of the file define a set of
        authorized users to the file system (and how)?  Is it possible
        to define different access controls for various subunits of a
        given file?

3.  Directories - Many systems maintain file directories which are
    designed to be helpful to the user.  A directory might, for
    example, provide a list of all files created by a particular
    individual, along with some information regarding file size,
    file structure, access controls, etc.  In general, such systems
    allow the user to input a pathname and retrieve the directory to
    which that pathname refers.  Aspects of the directory structure of
    interest are:

    a.  What are the syntax and semantics of a directory pathname?

    b.  What use is a directory, i.e., what type of information
        does the directory contain?

    c.  What access controls are used for access to the directories?
        For example, must a user supply a password in order to
        retrieve a directory, and is this password typically the same
        as the password he would use to retrieve a file listed in that
        directory.

                                                                [Page 2]
4.  Commands and functions of the file system - A general description
    of what the file system is designed to do would be useful.  For
    example, the system might simply accept an entire file and store
    it sequentially on a tape; with the only mode of retrieval being
    to retrieve the entire file.  On the other hand, the system might
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