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Annotation of researchv10dc/dist/man/v3/man8/salv.8, revision 1.1

1.1     ! root        1: .pa 1
        !             2: .he 'SALV (VIII)'1/20/73'SALV (VIII)'
        !             3: .ti 0
        !             4: NAME           salv -- file system salvage
        !             5: .sp
        !             6: .ti 0
        !             7: SYNOPSIS       /etc/salv_________ filesystem [ -akfs_____ ]
        !             8: .sp
        !             9: .ti 0
        !            10: DESCRIPTION
        !            11: .br
        !            12: .in 8
        !            13: salv____
        !            14: will place a given file system
        !            15: in a consistent state with
        !            16: almost no loss of information.
        !            17: This is the first step in putting things
        !            18: together after a bad crash.
        !            19: Salv performs the following functions:
        !            20: .sp
        !            21: .in +3
        !            22: A valid free list is constructed.
        !            23: 
        !            24: .in -3
        !            25: The previous step is always performed; the following steps
        !            26: are performed only if the "a" option is given.
        !            27: If the file system's only defect is missing blocks,
        !            28: "a" should not be specified.
        !            29: .in +3
        !            30: .sp
        !            31: All bad pointers in the file system are zeroed.
        !            32: .sp
        !            33: All duplicate pointers to the same block
        !            34: are resolved by changing one of the pointers
        !            35: to point at a new block containing a copy of the data.
        !            36: .sp
        !            37: Inodes (not directory entries) for special files
        !            38: are generated (mode 16).
        !            39: 
        !            40: Files whose size is too large for the number of
        !            41: blocks they contain (after bad pointers are zeroed)
        !            42: have their size revised downward.
        !            43: 
        !            44: .in -3
        !            45: The file system should be unmounted while it is
        !            46: being salvaged.
        !            47: In cases of extreme need the permanently mounted
        !            48: file system may be salvaged; in such a case
        !            49: the system must be rebooted before it
        !            50: has a chance to write out the old, bad super-block.
        !            51: 
        !            52: The "k", "f", and "s" options
        !            53: tell salv what magic numbers to use to generate
        !            54: the size of the free list and the i-node map.
        !            55: "k" is default (RK disk); "f" is RF; "s" is RK with
        !            56: swap space on it.
        !            57: If salv is to be used away
        !            58: from the mother system its code should be cheked
        !            59: to verify the numbers.
        !            60: .sp
        !            61: After a salv, files may be safely created
        !            62: and removed without causing
        !            63: more trouble.
        !            64: If the "a" option had to be used,
        !            65: a dcheck (VIII) should be done to find the degree
        !            66: of the damage to the hierarchy.
        !            67: .sp
        !            68: .in 16
        !            69: .ti 0
        !            70: FILES          /dev/rk0
        !            71: .sp
        !            72: .ti 0
        !            73: SEE ALSO       check(I), ds(I)
        !            74: .sp
        !            75: .ti 0
        !            76: DIAGNOSTICS    --
        !            77: .sp
        !            78: .ti 0
        !            79: BUGS           In
        !            80: only one (known) way does salv____ destroy information:
        !            81: if some random block appears to be an indirect block
        !            82: for a file,
        !            83: all "bad pointers" (for example, ASCII text) in it
        !            84: will be zeroed.  If
        !            85: the block also appears in another file, it may be
        !            86: scribbled on before it is copied.

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