Add thin_trim man page

man8/thin_trim.8

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+.TH THIN_TRIM 8 "Thin Provisioning Tools" "Red Hat, Inc." \" -*- nroff -*-
+.SH NAME
+thin_trim \- Issue discard requests for free pool space (offline tool).
+
+.SH SYNOPSIS
+.B thin_trim
+.RB [ options ]
+.I {device|file}
+
+.SH DESCRIPTION
+.B thin_trim
+sends discard requests to the pool device for unprovisioned areas.  It is an offline tool, 
+.B do not run it while the pool is active
+.
+
+.SH OPTIONS
+.IP "\fB\-\-pool-inactive\fP"
+Indicates you are aware the pool should be inactive.  Suppresses a warning message and prompt.
+
+.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_metadata_size(8)
+
+.SH AUTHOR
+Joe Thornber <ejt@redhat.com>