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Annotation of cci/usr/src/man/man8/icheck.8, revision 1.1

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.

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