Add a simple man page for thin_delta

man8/thin_delta.8

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+.TH THIN_DELTA 8 "Thin Provisioning Tools" "Red Hat, Inc." \" -*- nroff -*-
+.SH NAME
+thin_delta \- Print the differences in the mappings between two thin devices.
+
+.SH SYNOPSIS
+.B thin_delta
+.RB [ options ]
+.I {device|file}
+
+.SH DESCRIPTION
+.B thin_delta
+allows you to compare the mappings in two thin volumes (snapshots allow common blocks between thin volumes).
+.
+
+.SH OPTIONS
+.IP "\fB\-\-thin1, \-\-snap1\fP"
+The numeric identifier for the first thin volume to diff.
+
+.IP "\fB\-\-thin1, \-\-snap1\fP"
+The numeric identifier for the second thin volume to diff.
+
+.IP "\fB\-m, \-\-metadata\-snap\fP [block#]"
+
+If you want to get information out of a live pool then you will need
+to take a metadata snapshot and use this switch.  In order for the
+information to be meaningful you need to ensure the thin volumes
+you're examining are not changing (eg, do not activate those thins).
+
+.IP "\fB\-\-verbose"
+Provide extra information on the mappings.
+
+.IP "\fB\-h, \-\-help\fP"
+Print help and exit.
+
+.IP "\fB\-V, \-\-version\fP"
+Output version information and exit.
+
+.SH SEE ALSO
+.B thin_dump(8)
+.B thin_repair(8)
+.B thin_restore(8)
+.B thin_rmap(8)
+.B thin_trim(8)
+.B thin_metadata_size(8)
+
+.SH AUTHOR
+Joe Thornber <ejt@redhat.com>