Add man/btrfsck.8.in and Makefile for man pages

Signed-off-by: Goldwyn Rodrigues <rgoldwyn@gmail.com>

man/Makefile

@@ -0,0 +1,27 @@
+GZIP=gzip
+INSTALL= install
+
+prefix ?= /usr/local
+bindir = $(prefix)/bin
+mandir = $(prefix)/man
+man8dir = $(mandir)/man8
+
+MANPAGES = mkfs.btrfs.8.gz btrfsctl.8.gz btrfsck.8.gz
+
+all: $(MANPAGES)
+
+mkfs.btrfs.8.gz: mkfs.btrfs.8.in
+	$(GZIP) -n -c mkfs.btrfs.8.in > mkfs.btrfs.8.gz
+
+btrfsctl.8.gz: btrfsctl.8.in
+	$(GZIP) -n -c btrfsctl.8.in > btrfsctl.8.gz
+
+btrfsck.8.gz: btrfsck.8.in
+	$(GZIP) -n -c btrfsck.8.in > btrfsck.8.gz
+
+clean :
+	rm -f $(MANPAGES)
+
+install: $(MANPAGES)
+	$(INSTALL) -m755 -d $(DESTDIR)$(man8dir)
+	$(INSTALL) -m 644 $(MANPAGES) $(DESTDIR)$(man8dir)

man/btrfsck.8.in

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+.TH BTRFSCK 8
+.SH NAME
+btrfsck \- check a btrfs filesystem
+.SH SYNOPSIS
+.B btrfsck \fI device\fP
+.SH DESCRIPTION
+\fBbtrfsck\fP is used to check a btrfs filesystem.
+\fIdevice\fP is the device file where the filesystem is stored.
+.SH AVAILABILITY
+.B btrfsck
+is part of btrfs-progs. Btrfs is currently under heavy development,
+and not suitable for for any uses other than benchmarking and review.
+Please refer to the btrfs wiki http://btrfs.wiki.kernel.org for
+further details.
+.SH SEE ALSO
+.BR mkfs.btrfs (8)
+.BR btrfsctl (8)