![[BACK]](/cvsweb/icons/back.gif){kind=icon}
Return to icheck.8 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 / man8|
Return to icheck.8 CVS log | Up to [Power 6/32 Unix Tahoe 4.2BSD] / cci / usr / src / man / man8 |
1.1 root 1: .TH ICHECK 8 "4 February 1983"
2: .UC 4
3: .SH NAME
4: icheck \- file system storage consistency check
5: .SH SYNOPSIS
6: .B /etc/icheck
7: [
8: .B \-s
9: ] [
10: .B \-b
11: numbers ]
12: [ filesystem ]
13: .SH DESCRIPTION
14: .B N.B.:
15: .I Icheck
16: is obsoleted for normal consistency checking by
17: .IR fsck (8).
18: .PP
19: .I Icheck
20: examines a file system,
21: builds a bit map of used blocks,
22: and compares this bit map against
23: the free list maintained on the file system.
24: If the file system is not specified,
25: a set of default file systems
26: is checked.
27: The normal output of
28: .I icheck
29: includes a report of
30: .IP ""
31: The total number of files and the numbers of
32: regular, directory, block special and character special files.
33: .IP ""
34: The total number of blocks in use and the numbers of
35: single-, double-, and triple-indirect blocks and directory blocks.
36: .IP ""
37: The number of free blocks.
38: .IP ""
39: The number of blocks missing; i.e. not in any file
40: nor in the free list.
41: .PP
42: The
43: .B \-s
44: option causes
45: .I icheck
46: to ignore the actual free list and reconstruct a new one
47: by rewriting the super-block of the file system.
48: The file system should be dismounted while this is done;
49: if this is not possible (for example if
50: the root file system has to be salvaged)
51: care should be taken that the system is quiescent and that
52: it is rebooted immediately afterwards so that the old, bad in-core
53: copy of the super-block will not continue to be used.
54: Notice also that
55: the words in the super-block
56: which indicate the size of the free list and of the
57: i-list are believed.
58: If the super-block has been curdled
59: these words will have to be patched.
60: The
61: .B \-s
62: option
63: causes the normal output reports to be suppressed.
64: .PP
65: Following the
66: .B \-b
67: option is a list of block numbers;
68: whenever any of the named blocks turns up in a file,
69: a diagnostic is produced.
70: .PP
71: .I Icheck
72: is faster if the raw version of the special file is used,
73: since it reads the i-list many blocks at a time.
74: .SH FILES
75: Default file systems vary with installation.
76: .SH "SEE ALSO"
77: fsck(8), dcheck(8), ncheck(8),
78: fs(5), clri(8)
79: .SH DIAGNOSTICS
80: For duplicate blocks
81: and bad blocks (which lie outside the file system)
82: .I icheck
83: announces the difficulty, the i-number, and the kind of block involved.
84: If a read error is encountered,
85: the block number of the bad block is printed and
86: .I icheck
87: considers it to contain 0.
88: `Bad freeblock' means that
89: a block number outside the available space was encountered in the free list.
90: `\fIn\fR dups in free'
91: means that
92: .IR n ""
93: blocks were found in the free list which
94: duplicate blocks either in some file or in the earlier part of the free list.
95: .SH BUGS
96: Since
97: .I icheck
98: is inherently two-pass in nature, extraneous diagnostics
99: may be produced if applied to active file systems.
100: .PP
101: It believes even preposterous super-blocks and
102: consequently can get core images.
103: .PP
104: The system should be fixed so that the reboot after fixing the root
105: file system is not necessary.
This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.