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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 $
36 .Nd static information about the file systems
42 contains descriptive information about the various file
45 is only read by programs, and not written;
46 it is the duty of the system administrator to properly create
47 and maintain this file.
48 Each file system is described on a separate line;
49 fields on each line are separated by tabs or spaces.
50 The order of records in
57 sequentially iterate through
63 describes the special file or
64 remote file system to be mounted.
76 labels maybe augmented with a
83 based paths can mount serial numbers similar to
85 labels by using the path
86 .Pa /dev/serno/SERIALNO[.suffix] .
90 describes the mount point for the file system.
91 For swap partitions, this field should be specified as
96 describes the type of the file system.
97 The system can support various file system types.
102 file systems need be statically
103 compiled into the kernel;
104 everything else will be automatically loaded at mount
106 (Exception: the UFS family - FFS, MFS, and LFS cannot
107 currently be demand-loaded.) Some people still prefer to statically
108 compile other file systems as well.
110 The most common file system types are:
111 .Bl -tag -width ".Em HAMMER2" -offset indent
117 a local HAMMER2 file system
128 a Sun Microsystems compatible
129 .Dq "Network File System"
131 a disk partition to be used for swapping
135 DOS compatible file system
137 a local CD-ROM file system (as per ISO 9660)
138 .\" maybe also say Rock Ridge extensions are handled ?
140 a file system for accessing process data
145 describes the mount options associated with the file system.
146 It is formatted as a comma separated list of options.
147 It contains at least the type of mount (see
149 below) plus any additional options
150 appropriate to the file system type.
155 page and the file system specific page, such as
157 for additional options that may be specified.
159 If the options ``userquota'' and/or ``groupquota'' are specified,
160 the file system is automatically processed by the
162 command, and user and/or group disk quotas are enabled with
165 file system quotas are maintained in files named
169 which are located at the root of the associated file system.
170 These defaults may be overridden by putting an equal sign
171 and an alternative absolute pathname following the quota option.
172 Thus, if the user quota file for
175 .Pa /var/quotas/tmp.user ,
176 this location can be specified as:
177 .Bd -literal -offset indent
178 userquota=/var/quotas/tmp.user
181 If the option ``noauto'' is specified, the file system will not be automatically
182 mounted at system startup.
183 This is recommended for all remote file systems other than NFS,
184 since only NFS mounts are delayed until after network initialization
189 Swap partitions may specify the option ``crypt'' to automatically encrypt
190 the swap partition with a random key.
191 Note that you will not be able to
192 recover any kernel core dumps if you use this option.
194 The type of the mount is extracted from the
196 field and stored separately in the
198 field (it is not deleted from the
203 is ``rw'' or ``ro'' then the file system whose name is given in the
205 field is normally mounted read-write or read-only on the
206 specified special file.
209 is ``sw'' then the special file is made available as a piece of swap
212 command at the end of the system reboot procedure.
213 The fields other than
220 is specified as ``xx'' the entry is ignored.
221 This is useful to show disk partitions which are currently unused.
225 is used for these file systems by the
227 command to determine which file systems need to be dumped.
228 If the fifth field is not present, a value of zero is returned and
230 will assume that the file system does not need to be dumped.
236 program to determine the order in which file system checks are done
238 The root file system should be specified with a
240 of 1, and other file systems should have a
243 File systems within a drive will be checked sequentially,
244 but file systems on different drives will be checked at the
245 same time to utilize parallelism available in the hardware.
246 If the sixth field is not present or is zero,
247 a value of zero is returned and
249 will assume that the file system does not need to be checked.
251 #define FSTAB_RW "rw" /* read/write device */
252 #define FSTAB_RQ "rq" /* read/write with quotas */
253 #define FSTAB_RO "ro" /* read-only device */
254 #define FSTAB_SW "sw" /* swap device */
255 #define FSTAB_XX "xx" /* ignore totally */
258 char *fs_spec; /* block special device name */
259 char *fs_file; /* file system path prefix */
260 char *fs_vfstype; /* File system type, ufs, nfs */
261 char *fs_mntops; /* Mount options ala -o */
262 char *fs_type; /* FSTAB_* from fs_mntops */
263 int fs_freq; /* dump frequency, in days */
264 int fs_passno; /* pass number on parallel fsck */
268 The proper way to read records from
270 is to use the routines
277 .Bl -tag -width /etc/fstab -compact
299 file format appeared in