btrfs-progs: Documentaion: rename to .asciidoc

A few minor benefits:

* editors set highliting according to the extensions
* web access to the git repository (github) renders the .asciidoc
  files:
  * we can link to them from the wiki
  * the files are editable via browser and such editations can be
    submitted for merge easily

Signed-off-by: David Sterba <dsterba@suse.cz>

1 files changed, 50 insertions, 0 deletions

diff --git a/Documentation/btrfs-show-super.asciidoc b/Documentation/btrfs-show-super.asciidoc
new file mode 100644
index 00000000..1646be3b
--- /dev/null
+++ b/Documentation/btrfs-show-super.asciidoc
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+btrfs-show-super(8)
+====================
+
+NAME
+----
+btrfs-show-super - show btrfs superblock information stored in devices
+
+SYNOPSIS
+--------
+*btrfs-show-super* [options] <dev> [<dev>...]
+
+DESCRIPTION
+-----------
+*btrfs-show-super* is used to print the information of superblock,
+you can specify which mirror to print out.
+
+By default, every device's first superblock will be printed out.
+
+Mainly used for debug purpose.
+
+OPTIONS
+-------
+-f::
+Print full superblock information.
++
+Including the system chunk array and backup roots.
+
+-a::
+Print information of all superblocks.
++
+If this option is given, '-i' option will be ignored.
+
+-i <super_mirror>::
+Specify which mirror to print out.
++
+<super_mirror> is between 0 and 2.
+If several '-i <super_mirror>' are given, only the last one is valid.
+
+-F::
+Attempt to print the superblock even if no superblock magic is found.  May end
+badly.
+
+EXIT STATUS
+-----------
+*btrfs-show-super* will return 0 if no error happened.
+If any problems happened, 1 will be returned.
+
+SEE ALSO
+--------
+`mkfs.btrfs`(8)