crbdnamer: man page

Signed-off-by: Sage Weil <sage.weil@dreamhost.com>

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+.TH CRBDNAMER 8
+.SH NAME
+crbdnamer \- udev helper to name RBD devices
+.SH SYNOPSIS
+.B crbdnamer \fInum\fR
+.SH DESCRIPTION
+.B crbdnamer
+prints the pool and image name for the given RBD devices to stdout.  It is used by udev (using a rule like the one below) to set up a device symlink.
+.IP
+KERNEL=="rbd[0-9]*", PROGRAM="/usr/bin/crbdnamer %n", SYMLINK+="rbd/%c{1}/%c{2}:%n"
+.SH AVAILABILITY
+.B crbdnamer
+is part of the Ceph distributed file system.  Please refer to the Ceph wiki at
+http://ceph.newdream.net/wiki for more information.
+.SH SEE ALSO
+.BR rbd (8)
+.BR ceph (8)