From b3c3da71ed88c06bc18a4d8919c6e4af3b933566 Mon Sep 17 00:00:00 2001
From: Chris Mason <chris.mason@oracle.com>
Date: Wed, 23 Jul 2008 12:12:13 -0400
Subject: [PATCH] Btrfs: Add version strings on module load

Signed-off-by: Chris Mason <chris.mason@oracle.com>
---
 fs/btrfs/Makefile   |  6 +++++-
 fs/btrfs/super.c    |  3 +++
 fs/btrfs/version.sh | 43 +++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 51 insertions(+), 1 deletion(-)
 create mode 100644 fs/btrfs/version.sh

diff --git a/fs/btrfs/Makefile b/fs/btrfs/Makefile
index 0e2dcc718de2..f8a38b0da7fb 100644
--- a/fs/btrfs/Makefile
+++ b/fs/btrfs/Makefile
@@ -14,8 +14,12 @@ else
 # Normal Makefile
 
 KERNELDIR := /lib/modules/`uname -r`/build
-all:
+all: version
 	$(MAKE) -C $(KERNELDIR) M=`pwd` modules
+
+version:
+	bash version.sh
+
 modules_install:
 	$(MAKE) -C $(KERNELDIR) M=`pwd` modules_install
 clean:
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 5e28cf5c2e85..4cb6aac5122e 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -45,6 +45,7 @@
 #include "print-tree.h"
 #include "xattr.h"
 #include "volumes.h"
+#include "version.h"
 
 #define BTRFS_SUPER_MAGIC 0x9123683E
 
@@ -605,6 +606,8 @@ static int __init init_btrfs_fs(void)
 	err = register_filesystem(&btrfs_fs_type);
 	if (err)
 		goto unregister_ioctl;
+
+	printk(KERN_INFO "%s loaded\n", BTRFS_BUILD_VERSION);
 	return 0;
 
 unregister_ioctl:
diff --git a/fs/btrfs/version.sh b/fs/btrfs/version.sh
new file mode 100644
index 000000000000..fd9b53d39860
--- /dev/null
+++ b/fs/btrfs/version.sh
@@ -0,0 +1,43 @@
+#!/bin/bash
+#
+# determine-version -- report a useful version for releases
+#
+# Copyright 2008, Aron Griffis <agriffis@n01se.net>
+# Copyright 2008, Oracle
+# Released under the GNU GPLv2
+ 
+v="Btrfs v0.15"
+
+which hg > /dev/null
+if [ $? == 0 ]; then
+	last=$(hg tags | grep -m1 -o '^v[0-9.]\+')
+	 
+	# now check if the repo has commits since then...
+	if [[ $(hg id -t) == $last || \
+	    $(hg di -r "$last:." | awk '/^diff/{print $NF}' | sort -u) == .hgtags ]]
+	then
+	    # check if it's dirty
+	    if [[ $(hg id | cut -d' ' -f1) == *+ ]]; then
+		v=$last+
+	    else
+		v=$last
+	    fi
+	else
+	    # includes dirty flag
+	    v=$last+$(hg id -i)
+	fi
+fi
+ 
+echo "#ifndef __BUILD_VERSION" > .build-version.h
+echo "#define __BUILD_VERSION" >> .build-version.h
+echo "#define BTRFS_BUILD_VERSION \"Btrfs $v\"" >> .build-version.h
+echo "#endif" >> .build-version.h
+
+diff -q version.h .build-version.h >& /dev/null
+
+if [ $? == 0 ]; then
+    rm .build-version.h
+    exit 0
+fi
+
+mv .build-version.h version.h
-- 
2.39.2