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32 .\" @(#)fstab.5 8.1 (Berkeley) 6/5/93
40 .Nd static information about the file systems
46 contains descriptive information about the various file
49 is only read by programs, and not written;
50 it is the duty of the system administrator to properly create
51 and maintain this file.
52 Each file system is described on a separate line;
53 fields on each line are separated by tabs or spaces.
54 The order of records in
61 sequentially iterate through
67 describes the block special device or
68 remote file system to be mounted.
69 For file systems of type
71 the special file name is the block special file name,
72 and not the character special file name.
73 If a program needs the character special file name,
74 the program must create it by appending a ``r'' after the
75 last ``/'' in the special file name.
79 describes the mount point for the file system.
80 For swap partitions, this field should be specified as ``none''.
84 describes the type of the file system.
85 The system can support various file system types.
86 Only the root, /usr, and /tmp file systems need be statically
87 compiled into the kernel;
88 everything else will be automatically loaded at mount
90 (Exception: the UFS family - FFS and LFS cannot
91 currently be demand-loaded.)
92 Some people still prefer to statically
93 compile other file systems as well.
97 describes the mount options associated with the file system.
98 It is formatted as a comma separated list of options.
99 It contains at least the type of mount (see
101 below) plus any additional options
102 appropriate to the file system type.
107 page and the file system specific page, such as
109 for additional options that may be specified.
111 If the options ``userquota'' and/or ``groupquota'' are specified,
112 the file system is automatically processed by the
114 command, and user and/or group disk quotas are enabled with
117 file system quotas are maintained in files named
121 which are located at the root of the associated file system.
122 These defaults may be overridden by putting an equal sign
123 and an alternative absolute pathname following the quota option.
124 Thus, if the user quota file for
127 .Pa /var/quotas/tmp.user ,
128 this location can be specified as:
129 .Bd -literal -offset indent
130 userquota=/var/quotas/tmp.user
133 If the option ``noauto'' is specified, the file system will not be automatically
134 mounted at system startup.
135 Note that, for network file systems
137 (i.e., types supported by additional software
138 not included in the base system)
139 to be automatically mounted at system startup,
141 .Va extra_netfs_types
143 variable must be used to extend the
145 startup script's list of network file system types.
147 The type of the mount is extracted from the
149 field and stored separately in the
151 field (it is not deleted from the
156 is ``rw'' or ``ro'' then the file system whose name is given in the
158 field is normally mounted read-write or read-only on the
159 specified special file.
162 is ``sw'' then the special file is made available as a piece of swap
165 command at the end of the system reboot procedure.
166 The fields other than
173 is specified as ``xx'' the entry is ignored.
174 This is useful to show disk partitions which are currently unused.
178 is used for these file systems by the
180 command to determine which file systems need to be dumped.
181 If the fifth field is not present, a value of zero is returned and
183 will assume that the file system does not need to be dumped.
189 program to determine the order in which file system checks are done
191 The root file system should be specified with a
193 of 1, and other file systems should have a
196 File systems within a drive will be checked sequentially,
197 but file systems on different drives will be checked at the
198 same time to utilize parallelism available in the hardware.
199 If the sixth field is not present or is zero,
200 a value of zero is returned and
202 will assume that the file system does not need to be checked.
204 #define FSTAB_RW "rw" /* read/write device */
205 #define FSTAB_RQ "rq" /* read/write with quotas */
206 #define FSTAB_RO "ro" /* read-only device */
207 #define FSTAB_SW "sw" /* swap device */
208 #define FSTAB_XX "xx" /* ignore totally */
211 char *fs_spec; /* block special device name */
212 char *fs_file; /* file system path prefix */
213 char *fs_vfstype; /* File system type, ufs, nfs */
214 char *fs_mntops; /* Mount options ala -o */
215 char *fs_type; /* FSTAB_* from fs_mntops */
216 int fs_freq; /* dump frequency, in days */
217 int fs_passno; /* pass number on parallel fsck */
221 The proper way to read records from
223 is to use the routines
230 .Bl -tag -width /etc/fstab -compact
250 file format appeared in