fs(4)                     FILE FORMATS                      fs(4)



NAME
     fs (bfs) - format of the bfs file system volume

SYNOPSIS
     #include <sys/types.h>
     #include <sys/fs/bfs.h>

DESCRIPTION
     The bfs superblock is stored on sector 0. Its format is:

          struct bdsuper
          {
               long bdsupbfsmagic;          /* Magic number                 */
               offt bdsupstart;       /* Filesystem data start offset */
               offt bdsupend;         /* Filesystem data end offset   */

               /*
                * Sanity words
                */
               daddrt bdcpfromblock;       /* "From" block of current transfer */
               daddrt bdcptoblock;         /* "To" block of current transfer   */
               daddrt bdcpbfromblock; /* Backup of "from" block           */
               daddrt bdcpbtoblock;        /* Backup of "to" block             */
          };

          #define BFSMAGIC   0xBADFACE /* bfs magic number */

     The sanity words are  used to promote sanity during  compac-
     tion.   They  are  used by fsck(1M) to recover from a system
     crash at any point during compaction.  See  "Storage  Blocks
     under bfs" in the "The bfs File System" section of chapter 5
     in the System Administratror's Guide for  a  description  of
     compaction.

SEE ALSO
     bfs-specific inode(4)



















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