ffsinfo man page on FreeBSD

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FFSINFO(8)		  BSD System Manager's Manual		    FFSINFO(8)

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

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

DESCRIPTION
     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 std‐
	     out.

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

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

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

HISTORY
     The ffsinfo utility first appeared in FreeBSD 4.4.

AUTHORS
     Christoph Herrmann ⟨chm@FreeBSD.org⟩
     Thomas-Henning von Kamptz ⟨tomsoft@FreeBSD.org⟩
     The GROWFS team ⟨growfs@Tomsoft.COM⟩

BUGS
     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.

BSD			       September 8, 2000			   BSD
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