![[BACK]](/cvsweb/icons/back.gif){kind=icon}
Return to fstab.5 CVS log ![[TXT]](/cvsweb/icons/text.gif){kind=icon}
![[DIR]](/cvsweb/icons/dir.gif){kind=icon}
Up to [Power 6/32 Unix Tahoe 4.2BSD] / cci / usr / src / man / man5|
Return to fstab.5 CVS log | Up to [Power 6/32 Unix Tahoe 4.2BSD] / cci / usr / src / man / man5 |
1.1 root 1: .TH FSTAB 5 "26 June 1983"
2: .UC 4
3: .SH NAME
4: fstab \- static information about the filesystems
5: .SH SYNOPSIS
6: .B #include <fstab.h>
7: .SH DESCRIPTION
8: The file
9: .I /etc/fstab
10: contains descriptive information about the various file
11: systems.
12: .I /etc/fstab
13: is only
14: .I read
15: by programs, and not written;
16: it is the duty of the system administrator to properly create
17: and maintain this file.
18: The order of records in
19: .I /etc/fstab
20: is important because
21: .I fsck,
22: .I mount,
23: and
24: .I umount
25: sequentially iterate through
26: .I /etc/fstab
27: doing their thing.
28: .PP
29: The special file name is the
30: .B block
31: special file name,
32: and not the character special file name.
33: If a program needs the character special file name,
34: the program must create it by appending a ``r'' after the
35: last ``/'' in the special file name.
36: .PP
37: If
38: .I fs_type
39: is ``rw'' or ``ro'' then the file system whose name is given in the
40: .I fs_file
41: field is normally mounted read-write or read-only on the
42: specified special file. Physically setting the write-protected
43: button alone is not sufficient to establish the file system
44: as read-only. This
45: may have an adverse effect on the file
46: system. Either marking ``ro'' in
47: .I /etc/fstab
48: and rebooting or running
49: .I /etc/mount -r
50: will prevent the system from
51: writing to the specified disk. If
52: .I fs_type
53: is ``rq'', then the file system is normally mounted read-write
54: with disk quotas enabled.
55: The
56: .I fs_freq
57: field is used for these file systems by the
58: .IR dump (8)
59: command to determine which file systems need to be dumped.
60: The
61: .I fs_passno
62: field is used by the
63: .IR fsck (8)
64: program to determine the order in which file system checks are done
65: at reboot time.
66: The root file system should be specified with a
67: .I fs_passno
68: of 1, and other file systems should have larger numbers. File systems
69: within a drive should have distinct numbers, but file systems on different
70: drives can be checked on the same pass to utilize parallelism available in
71: the hardware.
72: .PP
73: If
74: .I fs_type
75: is ``sw'' then the special file is made available as a piece of swap
76: space by the
77: .IR swapon (8)
78: command at the end of the system reboot procedure.
79: The fields other than
80: .I fs_spec
81: and
82: .I fs_type
83: are not used in this case.
84: .PP
85: If
86: .I fs_type
87: is ``rq'' then at boot time the file system is automatically
88: processed by the
89: .IR quotacheck (8)
90: command and disk quotas are then enabled with
91: .IR quotaon (8).
92: File system quotas are maintained in a file ``quotas'', which is
93: located at the root of the associated file system.
94: .PP
95: If
96: .I fs_type
97: is specified as ``xx'' the entry is ignored.
98: This is useful to show disk partitions which are currently not used.
99: .sp 1
100: .nf
101: .DT
102: #define FSTAB_RW "rw" /* read-write device */
103: #define FSTAB_RO "ro" /* read-only device */
104: #define FSTAB_RQ "rq" /* read-write with quotas */
105: #define FSTAB_SW "sw" /* swap device */
106: #define FSTAB_XX "xx" /* ignore totally */
107: .PP
108: .ta \w'#define 'u +\w'char\ \ 'u +\w'fs_passno; 'u
109: struct fstab {
110: char *fs_spec; /* block special device name */
111: char *fs_file; /* file system path prefix */
112: char *fs_type; /* rw,ro,sw or xx */
113: int fs_freq; /* dump frequency, in days */
114: int fs_passno; /* pass number on parallel dump */
115: };
116: .fi
117: .PP
118: The proper way to read records from
119: .I /etc/fstab
120: is to use the routines getfsent(), getfsspec(), getfstype(),
121: and getfsfile().
122: .SH FILES
123: /etc/fstab
124: .SH SEE ALSO
125: getfsent(3X)
This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.