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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 $
31 .Dd September 13, 2009
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 indent -offset indent
126 a Sun Microsystems compatible
127 .Dq "Network File System"
129 a disk partition to be used for swapping
133 DOS compatible file system
135 a local CD-ROM file system (as per ISO 9660)
136 .\" maybe also say Rock Ridge extensions are handled ?
138 a file system for accessing process data
143 describes the mount options associated with the file system.
144 It is formatted as a comma separated list of options.
145 It contains at least the type of mount (see
147 below) plus any additional options
148 appropriate to the file system type.
153 page and the file system specific page, such as
155 for additional options that may be specified.
157 If the options ``userquota'' and/or ``groupquota'' are specified,
158 the file system is automatically processed by the
160 command, and user and/or group disk quotas are enabled with
163 file system quotas are maintained in files named
167 which are located at the root of the associated file system.
168 These defaults may be overridden by putting an equal sign
169 and an alternative absolute pathname following the quota option.
170 Thus, if the user quota file for
173 .Pa /var/quotas/tmp.user ,
174 this location can be specified as:
175 .Bd -literal -offset indent
176 userquota=/var/quotas/tmp.user
179 If the option ``noauto'' is specified, the file system will not be automatically
180 mounted at system startup.
181 This is recommended for all remote file systems other than NFS,
182 since only NFS mounts are delayed until after network initialization
187 Swap partitions may specify the option ``crypt'' to automatically encrypt
188 the swap partition with a random key. Note that you will not be able to
189 recover any kernel core dumps if you use this option.
191 The type of the mount is extracted from the
193 field and stored separately in the
195 field (it is not deleted from the
200 is ``rw'' or ``ro'' then the file system whose name is given in the
202 field is normally mounted read-write or read-only on the
203 specified special file.
206 is ``sw'' then the special file is made available as a piece of swap
209 command at the end of the system reboot procedure.
210 The fields other than
217 is specified as ``xx'' the entry is ignored.
218 This is useful to show disk partitions which are currently unused.
222 is used for these file systems by the
224 command to determine which file systems need to be dumped.
225 If the fifth field is not present, a value of zero is returned and
227 will assume that the file system does not need to be dumped.
233 program to determine the order in which file system checks are done
235 The root file system should be specified with a
237 of 1, and other file systems should have a
240 File systems within a drive will be checked sequentially,
241 but file systems on different drives will be checked at the
242 same time to utilize parallelism available in the hardware.
243 If the sixth field is not present or is zero,
244 a value of zero is returned and
246 will assume that the file system does not need to be checked.
248 #define FSTAB_RW "rw" /* read/write device */
249 #define FSTAB_RQ "rq" /* read/write with quotas */
250 #define FSTAB_RO "ro" /* read-only device */
251 #define FSTAB_SW "sw" /* swap device */
252 #define FSTAB_XX "xx" /* ignore totally */
255 char *fs_spec; /* block special device name */
256 char *fs_file; /* file system path prefix */
257 char *fs_vfstype; /* File system type, ufs, nfs */
258 char *fs_mntops; /* Mount options ala -o */
259 char *fs_type; /* FSTAB_* from fs_mntops */
260 int fs_freq; /* dump frequency, in days */
261 int fs_passno; /* pass number on parallel fsck */
265 The proper way to read records from
267 is to use the routines
274 .Bl -tag -width /etc/fstab -compact
295 file format appeared in