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Annotation of 43BSDReno/share/man/man5/fstab.5, revision 1.1

1.1     ! root        1: .\" Copyright (c) 1980, 1989 The Regents of the University of California.
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        !            18: .\"    @(#)fstab.5     6.4 (Berkeley) 6/23/90
        !            19: .\"
        !            20: .TH FSTAB 5  "June 23, 1990"
        !            21: .UC 4
        !            22: .SH NAME
        !            23: fstab \- static information about the filesystems
        !            24: .SH SYNOPSIS
        !            25: .B #include <fstab.h>
        !            26: .SH DESCRIPTION
        !            27: The file
        !            28: .I /etc/fstab
        !            29: contains descriptive information about the various file
        !            30: systems.
        !            31: .I /etc/fstab
        !            32: is only read by programs, and not written;
        !            33: it is the duty of the system administrator to properly create 
        !            34: and maintain this file.
        !            35: Each filesystem is described on a separate line;
        !            36: fields on each line are separated by tabs or spaces.
        !            37: The order of records in
        !            38: .I /etc/fstab
        !            39: is important because
        !            40: .I fsck,
        !            41: .I mount,
        !            42: and
        !            43: .I umount
        !            44: sequentially iterate through
        !            45: .I /etc/fstab
        !            46: doing their thing.
        !            47: .PP
        !            48: The first field, (\c
        !            49: .IR \|fs_spec ),
        !            50: describes the block special device or
        !            51: remote filesystem to be mounted.
        !            52: For filesystems of type
        !            53: .BR ufs ,
        !            54: the special file name is the block special file name, 
        !            55: and not the character special file name.
        !            56: If a program needs the character special file name,
        !            57: the program must create it by appending a ``r'' after the
        !            58: last ``/'' in the special file name.
        !            59: .PP
        !            60: The second field, (\c
        !            61: .IR \|fs_file ),
        !            62: describes the mount point for the filesystem.
        !            63: For swap partitions, this field should be specified as ``none''.
        !            64: .PP
        !            65: The third field, (\c
        !            66: .IR \|fs_vfstype ),
        !            67: describes the type of the filesystem.
        !            68: The system currently supports four types of filesystems:
        !            69: .IP \fBufs\fR 8
        !            70: a local UNIX filesystem
        !            71: .IP \fBmfs\fR 8
        !            72: a local memory-based UNIX filesystem
        !            73: .IP \fBnfs\fR 8
        !            74: a Sun Microsystems compatible ``Network File System''
        !            75: .IP \fBswap\fR 8
        !            76: a disk partition to be used for swapping
        !            77: .PP
        !            78: The fourth field, (\c
        !            79: .IR \|fs_mntops ),
        !            80: describes the mount options associated with the filesystem.
        !            81: It is formatted as a comma separated list of options.
        !            82: It contains at least the type of mount (see
        !            83: .I fs_type
        !            84: below) plus any additional options
        !            85: appropriate to the filesystem type.
        !            86: .PP
        !            87: If the options ``userquota'' and/or ``groupquota'' are specified,
        !            88: the filesystem is automatically processed by the
        !            89: .IR quotacheck (8)
        !            90: command, and user and/or group disk quotas are enabled with
        !            91: .IR quotaon (8).
        !            92: By default,
        !            93: filesystem quotas are maintained in files named
        !            94: .I quota.user
        !            95: and
        !            96: .I quota.group
        !            97: which are located at the root of the associated filesystem.
        !            98: These defaults may be overridden by putting an equal sign
        !            99: and an alternative absolute pathname following the quota option.
        !           100: Thus, if the user quota file for /tmp is stored in /var/quotas/tmp.user,
        !           101: this location can be specified as:
        !           102: .IP
        !           103:        userquota=/var/quotas/tmp.user
        !           104: .PP
        !           105: The type of the mount is extracted from the
        !           106: .I fs_mntops
        !           107: field and stored separately in the
        !           108: .I fs_type
        !           109: field (it is not deleted from the
        !           110: .I fs_mntops
        !           111: field).
        !           112: If
        !           113: .I fs_type
        !           114: is ``rw'' or ``ro'' then the filesystem whose name is given in the
        !           115: .I fs_file
        !           116: field is normally mounted read-write or read-only on the
        !           117: specified special file.
        !           118: If
        !           119: .I fs_type
        !           120: is ``sw'' then the special file is made available as a piece of swap
        !           121: space by the
        !           122: .IR swapon (8)
        !           123: command at the end of the system reboot procedure.
        !           124: The fields other than
        !           125: .I fs_spec
        !           126: and
        !           127: .I fs_type
        !           128: are unused.
        !           129: If
        !           130: .I fs_type
        !           131: is specified as ``xx'' the entry is ignored.
        !           132: This is useful to show disk partitions which are currently unused.
        !           133: .PP
        !           134: The fifth field, (\c
        !           135: .IR \|fs_freq ),
        !           136: is used for these filesystems by the
        !           137: .IR dump (8)
        !           138: command to determine which filesystems need to be dumped.
        !           139: If the fifth field is not present, a value of zero is returned and
        !           140: .I dump
        !           141: will assume that the filesystem does not need to be dumped.
        !           142: .PP
        !           143: The sixth field, (\c
        !           144: .IR \|fs_passno ),
        !           145: is used by the
        !           146: .IR fsck (8)
        !           147: program to determine the order in which filesystem checks are done
        !           148: at reboot time.
        !           149: The root filesystem should be specified with a
        !           150: .I fs_passno
        !           151: of 1, and other filesystems should have a 
        !           152: .I fs_passno
        !           153: of 2.
        !           154: Filesystems within a drive will be checked sequentially,
        !           155: but filesystems on different drives will be checked at the
        !           156: same time to utilize parallelism available in the hardware.
        !           157: If the sixth field is not present or zero,
        !           158: a value of zero is returned and
        !           159: .I fsck
        !           160: will assume that the filesystem does not need to be checked.
        !           161: .sp 1
        !           162: .nf
        !           163: .DT
        !           164: #define        FSTAB_RW        "rw"    /* read-write device */
        !           165: #define        FSTAB_RO        "ro"    /* read-only device */
        !           166: #define        FSTAB_SW        "sw"    /* swap device */
        !           167: #define        FSTAB_XX        "xx"    /* ignore totally */
        !           168: .PP
        !           169: .ta \w'#define 'u +\w'char\ \ 'u +\w'*fs_vfstype;\ \ 'u
        !           170: struct fstab {
        !           171:        char    *fs_spec;       /* block special device name */
        !           172:        char    *fs_file;       /* filesystem path prefix */
        !           173:        char    *fs_vfstype;    /* type of filesystem */
        !           174:        char    *fs_mntops;     /* comma separated mount options */
        !           175:        char    *fs_type;       /* rw, ro, sw, or xx */
        !           176:        int     fs_freq;        /* dump frequency, in days */
        !           177:        int     fs_passno;      /* pass number on parallel dump */
        !           178: };
        !           179: .fi
        !           180: .PP
        !           181: The proper way to read records from
        !           182: .I /etc/fstab
        !           183: is to use the routines getfsent(), getfsspec(), getfstype(),
        !           184: and getfsfile().
        !           185: .SH FILES
        !           186: /etc/fstab
        !           187: .SH SEE ALSO
        !           188: getfsent(3)

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