Provided by: ufsutils_8.2-3_amd64 bug


     ffsinfo — dump all meta information of an existing ufs file system


     ffsinfo [-g cylinder_group] [-i inode] [-l level] [-o outfile] special | file


     The ffsinfo utility extends the dumpfs(8) utility.

     The output is appended to the file outfile.  Also expect the output file to be rather large.
     Up to 2 percent of the size of the specified file system is not uncommon.

     The following options are available:

     -g cylinder_group
             This restricts the dump to information about this cylinder group only.  Here 0 means
             the first cylinder group and -1 the last one.

     -i inode
             This restricts the dump to information about this particular inode only.  Here the
             minimum acceptable inode is 2.  If this option is omitted but a cylinder group is
             defined then only inodes within that cylinder group are dumped.

     -l level
             The level of detail which will be dumped.  This value defaults to 255 and is the
             “bitwise or” of the following table:

             0x001   initial superblock
             0x002   superblock copies in each cylinder group
             0x004   cylinder group summary in initial cylinder group
             0x008   cylinder group information
             0x010   inode allocation bitmap
             0x020   fragment allocation bitmap
             0x040   cluster maps and summary
             0x100   inode information
             0x200   indirect block dump

     -o outfile
             This sets the output filename where the dump is written to, and must be specified.
             If - is provided, output will be sent to stdout.


           ffsinfo -o /var/tmp/ffsinfo -l 1023 /dev/vinum/testvol

     will dump /dev/vinum/testvol to /var/tmp/ffsinfo with all available information.


     disklabel(8), dumpfs(8), fsck(8), growfs(8), newfs(8), tunefs(8), vinum(8)


     The ffsinfo utility first appeared in FreeBSD 4.4.


     Christoph Herrmann <>
     Thomas-Henning von Kamptz <>
     The GROWFS team <growfs@Tomsoft.COM>


     Snapshots are handled like plain files.  They should get their own level to provide for
     independent control of the amount of what gets dumped.  It probably also makes sense to some
     extend to dump the snapshot as a file system.