1 .\" Copyright (c) 1980, 1989, 1991, 1993
2 .\" The Regents of the University of California. All rights reserved.
4 .\" Redistribution and use in source and binary forms, with or without
5 .\" modification, are permitted provided that the following conditions
7 .\" 1. Redistributions of source code must retain the above copyright
8 .\" notice, this list of conditions and the following disclaimer.
9 .\" 2. Redistributions in binary form must reproduce the above copyright
10 .\" notice, this list of conditions and the following disclaimer in the
11 .\" documentation and/or other materials provided with the distribution.
12 .\" 3. Neither the name of the University nor the names of its contributors
13 .\" may be used to endorse or promote products derived from this software
14 .\" without specific prior written permission.
16 .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
17 .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
20 .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 .\" @(#)fstab.5 8.1 (Berkeley) 6/5/93
29 .\" $FreeBSD: src/share/man/man5/fstab.5,v 1.11.2.8 2003/02/10 12:21:08 des Exp $
30 .\" $DragonFly: src/share/man/man5/fstab.5,v 1.5 2008/07/27 21:16:00 thomas Exp $
32 .Dd September 13, 2009
37 .Nd static information about the file systems
43 contains descriptive information about the various file
46 is only read by programs, and not written;
47 it is the duty of the system administrator to properly create
48 and maintain this file.
49 Each file system is described on a separate line;
50 fields on each line are separated by tabs or spaces.
51 The order of records in
58 sequentially iterate through
64 describes the special file or
65 remote file system to be mounted.
77 labels maybe augmented with a
84 based paths can mount serial numbers similar to
86 labels by using the path
87 .Pa /dev/serno/SERIALNO[.suffix] .
91 describes the mount point for the file system.
92 For swap partitions, this field should be specified as
97 describes the type of the file system.
98 The system can support various file system types.
103 file systems need be statically
104 compiled into the kernel;
105 everything else will be automatically loaded at mount
107 (Exception: the UFS family - FFS, MFS, and LFS cannot
108 currently be demand-loaded.) Some people still prefer to statically
109 compile other file systems as well.
111 The most common file system types are:
112 .Bl -tag -width indent -offset indent
127 a Sun Microsystems compatible
128 .Dq "Network File System"
130 a disk partition to be used for swapping
134 DOS compatible file system
136 a local CD-ROM file system (as per ISO 9660)
137 .\" maybe also say Rock Ridge extensions are handled ?
139 a file system for accessing process data
144 describes the mount options associated with the file system.
145 It is formatted as a comma separated list of options.
146 It contains at least the type of mount (see
148 below) plus any additional options
149 appropriate to the file system type.
154 page and the file system specific page, such as
156 for additional options that may be specified.
158 If the options ``userquota'' and/or ``groupquota'' are specified,
159 the file system is automatically processed by the
161 command, and user and/or group disk quotas are enabled with
164 file system quotas are maintained in files named
168 which are located at the root of the associated file system.
169 These defaults may be overridden by putting an equal sign
170 and an alternative absolute pathname following the quota option.
171 Thus, if the user quota file for
174 .Pa /var/quotas/tmp.user ,
175 this location can be specified as:
176 .Bd -literal -offset indent
177 userquota=/var/quotas/tmp.user
180 If the option ``noauto'' is specified, the file system will not be automatically
181 mounted at system startup.
182 This is recommended for all remote file systems other than NFS,
183 since only NFS mounts are delayed until after network initialization
188 The type of the mount is extracted from the
190 field and stored separately in the
192 field (it is not deleted from the
197 is ``rw'' or ``ro'' then the file system whose name is given in the
199 field is normally mounted read-write or read-only on the
200 specified special file.
203 is ``sw'' then the special file is made available as a piece of swap
206 command at the end of the system reboot procedure.
207 The fields other than
214 is specified as ``xx'' the entry is ignored.
215 This is useful to show disk partitions which are currently unused.
219 is used for these file systems by the
221 command to determine which file systems need to be dumped.
222 If the fifth field is not present, a value of zero is returned and
224 will assume that the file system does not need to be dumped.
230 program to determine the order in which file system checks are done
232 The root file system should be specified with a
234 of 1, and other file systems should have a
237 File systems within a drive will be checked sequentially,
238 but file systems on different drives will be checked at the
239 same time to utilize parallelism available in the hardware.
240 If the sixth field is not present or is zero,
241 a value of zero is returned and
243 will assume that the file system does not need to be checked.
245 #define FSTAB_RW "rw" /* read/write device */
246 #define FSTAB_RQ "rq" /* read/write with quotas */
247 #define FSTAB_RO "ro" /* read-only device */
248 #define FSTAB_SW "sw" /* swap device */
249 #define FSTAB_XX "xx" /* ignore totally */
252 char *fs_spec; /* block special device name */
253 char *fs_file; /* file system path prefix */
254 char *fs_vfstype; /* File system type, ufs, nfs */
255 char *fs_mntops; /* Mount options ala -o */
256 char *fs_type; /* FSTAB_* from fs_mntops */
257 int fs_freq; /* dump frequency, in days */
258 int fs_passno; /* pass number on parallel fsck */
262 The proper way to read records from
264 is to use the routines
271 .Bl -tag -width /etc/fstab -compact
292 file format appeared in