unixdev.net


Switch to SpeakEasy.net DSL

The Modular Manual Browser

Home Page
Manual: (4.2BSD)
Page:
Section:
Apropos / Subsearch:
optional field

FSTAB(5)                      File Formats Manual                     FSTAB(5)



NAME
       fstab - static information about the filesystems

SYNOPSIS
       #include <&lt;fstab.h>&gt;

DESCRIPTION
       The  file /etc/fstab contains descriptive information about the various
       file systems.  /etc/fstab is only read by programs, and not written; it
       is the duty of the system administrator to properly create and maintain
       this file.  The order of records in  /etc/fstab  is  important  because
       fsck,  mount,  and umount sequentially iterate through /etc/fstab doing
       their thing.

       The special file name is the block special file name, and not the char-
       acter special file name.  If a program needs the character special file
       name, the program must create it by appending a ``r''  after  the  last
       ``/'' in the special file name.

       If fs_type is ``rw'' or ``ro'' then the file system whose name is given
       in the fs_file field is normally mounted read-write or read-only on the
       specified  special file.  If fs_type is ``rq'', then the file system is
       normally mounted read-write with  disk  quotas  enabled.   The  fs_freq
       field  is  used for these file systems by the dump(8) command to deter-
       mine which file systems need to be dumped.  The fs_passno field is used
       by  the  fsck(8)  program  to  determine the order in which file system
       checks are done at reboot time.  The root file system should be  speci-
       fied  with  a fs_passno of 1, and other file systems should have larger
       numbers.  File systems within a drive should have distinct numbers, but
       file  systems  on  different  drives can be checked on the same pass to
       utilize parallelism available in the hardware.

       If fs_type is ``sw'' then the special file is made available as a piece
       of  swap space by the swapon(8) command at the end of the system reboot
       procedure.  The fields other than fs_spec and fs_type are not  used  in
       this case.

       If fs_type is ``rq'' then at boot time the file system is automatically
       processed by the quotacheck(8) command and disk quotas are then enabled
       with  quotaon(8).   File  system quotas are maintained in a file ``quo-
       tas'', which is located at the root of the associated file system.

       If fs_type is specified as ``xx'' the entry is ignored.  This is useful
       to show disk partitions which are currently not used.

       #define   FSTAB_RW  "rw" /* read-write device */
       #define   FSTAB_RO  "ro" /* read-only device */
       #define   FSTAB_RQ  "rq" /* read-write with quotas */
       #define   FSTAB_SW  "sw" /* swap device */
       #define   FSTAB_XX  "xx" /* ignore totally */

       struct fstab {
               char  *fs_spec;  /* block special device name */
               char  *fs_file;  /* file system path prefix */
               char  *fs_type;  /* rw,ro,sw or xx */
               int   fs_freq;   /* dump frequency, in days */
               int   fs_passno; /* pass number on parallel dump */
       };

       The  proper  way to read records from /etc/fstab is to use the routines
       getfsent(), getfsspec(), getfstype(), and getfsfile().

FILES
       /etc/fstab

SEE ALSO
       getfsent(3X)



4th Berkeley Distribution        26 June 1983                         FSTAB(5)