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32 .\" @(#)fstab.5 8.1 (Berkeley) 6/5/93
33 .\" $FreeBSD: src/share/man/man5/fstab.5,v 1.11.2.8 2003/02/10 12:21:08 des Exp $
34 .\" $DragonFly: src/share/man/man5/fstab.5,v 1.5 2008/07/27 21:16:00 thomas Exp $
41 .Nd static information about the file systems
47 contains descriptive information about the various file
50 is only read by programs, and not written;
51 it is the duty of the system administrator to properly create
52 and maintain this file.
53 Each file system is described on a separate line;
54 fields on each line are separated by tabs or spaces.
55 The order of records in
62 sequentially iterate through
68 describes the special file or
69 remote file system to be mounted.
73 describes the mount point for the file system.
74 For swap partitions, this field should be specified as
79 describes the type of the file system.
80 The system can support various file system types.
85 file systems need be statically
86 compiled into the kernel;
87 everything else will be automatically loaded at mount
88 time. (Exception: the UFS family - FFS, MFS, and LFS cannot
89 currently be demand-loaded.) Some people still prefer to statically
90 compile other file systems as well.
92 The most common file system types are:
93 .Bl -tag -width indent -offset indent
108 a Sun Microsystems compatible
109 .Dq "Network File System"
111 a disk partition to be used for swapping
115 DOS compatible file system
117 a local CD-ROM file system (as per ISO 9660)
118 .\" maybe also say Rock Ridge extensions are handled ?
120 a file system for accessing process data
125 describes the mount options associated with the file system.
126 It is formatted as a comma separated list of options.
127 It contains at least the type of mount (see
129 below) plus any additional options
130 appropriate to the file system type. See the options flag
134 page and the file system specific page, such as
136 for additional options that may be specified.
138 If the options ``userquota'' and/or ``groupquota'' are specified,
139 the file system is automatically processed by the
141 command, and user and/or group disk quotas are enabled with
144 file system quotas are maintained in files named
148 which are located at the root of the associated file system.
149 These defaults may be overridden by putting an equal sign
150 and an alternative absolute pathname following the quota option.
151 Thus, if the user quota file for
154 .Pa /var/quotas/tmp.user ,
155 this location can be specified as:
156 .Bd -literal -offset indent
157 userquota=/var/quotas/tmp.user
160 If the option ``noauto'' is specified, the file system will not be automatically
161 mounted at system startup.
162 This is recommended for all remote file systems other than NFS,
163 since only NFS mounts are delayed until after network initialization
168 The type of the mount is extracted from the
170 field and stored separately in the
172 field (it is not deleted from the
177 is ``rw'' or ``ro'' then the file system whose name is given in the
179 field is normally mounted read-write or read-only on the
180 specified special file.
183 is ``sw'' then the special file is made available as a piece of swap
186 command at the end of the system reboot procedure.
187 The fields other than
194 is specified as ``xx'' the entry is ignored.
195 This is useful to show disk partitions which are currently unused.
199 is used for these file systems by the
201 command to determine which file systems need to be dumped.
202 If the fifth field is not present, a value of zero is returned and
204 will assume that the file system does not need to be dumped.
210 program to determine the order in which file system checks are done
212 The root file system should be specified with a
214 of 1, and other file systems should have a
217 File systems within a drive will be checked sequentially,
218 but file systems on different drives will be checked at the
219 same time to utilize parallelism available in the hardware.
220 If the sixth field is not present or is zero,
221 a value of zero is returned and
223 will assume that the file system does not need to be checked.
225 #define FSTAB_RW "rw" /* read/write device */
226 #define FSTAB_RQ "rq" /* read/write with quotas */
227 #define FSTAB_RO "ro" /* read-only device */
228 #define FSTAB_SW "sw" /* swap device */
229 #define FSTAB_XX "xx" /* ignore totally */
232 char *fs_spec; /* block special device name */
233 char *fs_file; /* file system path prefix */
234 char *fs_vfstype; /* File system type, ufs, nfs */
235 char *fs_mntops; /* Mount options ala -o */
236 char *fs_type; /* FSTAB_* from fs_mntops */
237 int fs_freq; /* dump frequency, in days */
238 int fs_passno; /* pass number on parallel fsck */
242 The proper way to read records from
244 is to use the routines
251 .Bl -tag -width /etc/fstab -compact
272 file format appeared in