4.3BSD - /usr/man/cat5/fstab.0

FSTAB(5)                                                              FSTAB(5)


NAME
       fstab - static information about the filesystems

SYNOPSIS
       #include <fstab.h>

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        May 15, 1985                         FSTAB(5)