btrfs-progs: Convert man page for btrfs-debug-tree.

Convert man page for btrfs-debug-tree.

Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.cz>

Documentation/Makefile

@@ -4,7 +4,7 @@ MAN8_TXT =
 # Top level commands
 MAN8_TXT += btrfs.txt
 MAN8_TXT += btrfs-convert.txt
-#MAN8_TXT += btrfs-debug-tree.txt
+MAN8_TXT += btrfs-debug-tree.txt
 #MAN8_TXT += btrfs-find-root.txt
 #MAN8_TXT += btrfs-image.txt
 #MAN8_TXT += btrfs-map-logical.txt

Documentation/btrfs-debug-tree.txt

@@ -0,0 +1,50 @@
+btrfs-debug-tree(8)
+===================
+
+NAME
+----
+btrfs-debug-tree - dump btrfs filesystem metadata into stdout
+
+SYNOPSIS
+--------
+'btrfs-debug-tree' [options] <device>
+
+DESCRIPTION
+-----------
+'btrfs-debug-tree' is used to dump the whole tree of the given device.
+
+This is maybe useful for analyzing filesystem state or inconsistence and has
+a positive educational effect on understanding the internal structure.
+<device> is the device file where the filesystem is stored.
+
+OPTIONS
+-------
+-e::
+Print detailed extents info.
+-d::
+Print info of btrfs device and root tree dirs only.
+-r::
+Print info of roots only.
+-b <block_num>::
+Print info of the specified block only.
+
+EXIT STATUS
+-----------
+'btrfs-debug-tree' will return 0 if no error happened.
+If any problems happened, 1 will be returned.
+
+AUTHOR
+------
+Written by Shilong Wang and Wenruo Qu.
+
+COPYRIGHT
+---------
+Copyright (C) 2013 FUJITSU LIMITED.
+
+License GPLv2: GNU GPL version 2 <http://gnu.org/licenses/gpl.html>.
+
+This is free software: you are free  to  change  and  redistribute  it. There is NO WARRANTY, to the extent permitted by law.
+
+SEE ALSO
+--------
+`mkfs.btrfs`(8)