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dumpfile(5) - dump file - Format of a dump file - man 5 dumpfile

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dump file(1,n)(5)                                                      dump file(1,n)(5)



NAME
       dump file(1,n) - Format of a dump file(1,n)




DESCRIPTION
       The dump files are formatted as tagged byte streams.  Each piece of the
       dump is marked by a tag byte, a number between 1 and  20.   Each  piece
       may  also  be  broken  into  subpieces,  each marked by a letter of the
       alphabet.  Each subpiece is uniquely marked, but tags can be reused  in(1,8)
       different parts of the dump.

       The first 60 bytes of the dump contain header information.  This header
       info(1,5,n) identifies which backup volume was used to create  the  dump,  and
       when and from which volume the backup clone was created.  It also indi-
       cates whether the dump was incremental, and provides information to  be
       used  later  in(1,8)  placing  this dump in(1,8) the proper sequence for merging.
       Following the dump header is the  volume information structure used  by
       the  Coda  internals.   Following this are two sequences of vnodes, one
       for directories and one for files.  Each sequence consists of a  header
       and a stream of vnodes.

       The vnode sequence header contains the number of vnodes and the size of
       the vnode list.  These numbers are not necessarily the same  since  not
       every  list  needs  to  have a vnode on it and some lists may have more
       than one.  This is an artifact of the way vnodes are stored in(1,8) the Coda
       servers.

       After  these two fields comes a list of vnodes.  Each vnode consists of
       two parts, the first is the meta information associated with  the  file(1,n)
       or  directory  and  the  second  is the data for that vnode.  This data
       could either be directory pages or file(1,n) data.  The first word after the
       tag  for  the  file(1,n)  or directory data is a count of bytes or directory
       pages.  For directory vnodes, the access(2,5) list  for  that  directory  is
       included as part of the meta information.





SEE ALSO
       backup (8), dumplist (5), volutil (8)



AUTHOR
       Joshua Raiff, 1993, Taken from system adminstrators guide.




                                                                  dump file(1,n)(5)

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