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Annotation of researchv10dc/dist/man/v4/manx/salv.8, revision 1.1.1.1

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 checked
                     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: .ti 0
                     69: SEE ALSO check(VIII), dcheck(VIII)
                     70: .sp
                     71: .ti 0
                     72: BUGS   In
                     73: only one (known) way does salv____ destroy information:
                     74: if some random block appears to be an indirect block
                     75: for a file,
                     76: all "bad pointers" (for example, ASCII text) in it
                     77: will be zeroed.  If
                     78: the block also appears in another file, it may be
                     79: scribbled on before it is copied.
                     80: .br
                     81: .in 16

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