extras: Add script to be used before using quota translator.

Signed-off-by: Pavan Vilas Sondur <pavan@gluster.com>
Signed-off-by: Anand V. Avati <avati@dev.gluster.com>

BUG: 569 (Memory leak in quota translator)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=569

2 files changed, 87 insertions, 1 deletions

diff --git a/extras/Makefile.am b/extras/Makefile.am
index 8ad2f6302..c11137143 100644
--- a/extras/Makefile.am
+++ b/extras/Makefile.am
@@ -5,5 +5,5 @@ EditorMode_DATA = glusterfs-mode.el glusterfs.vim
 
 SUBDIRS = init.d benchmarking volgen
 
-EXTRA_DIST = specgen.scm MacOSX/Portfile glusterfs-mode.el glusterfs.vim migrate-unify-to-distribute.sh backend-xattr-sanitize.sh backend-cleanup.sh defrag.sh scale-n-defrag.sh
+EXTRA_DIST = specgen.scm MacOSX/Portfile glusterfs-mode.el glusterfs.vim migrate-unify-to-distribute.sh backend-xattr-sanitize.sh backend-cleanup.sh defrag.sh scale-n-defrag.sh disk_usage_sync.sh
 
diff --git a/extras/disk_usage_sync.sh b/extras/disk_usage_sync.sh
new file mode 100755
index 000000000..85ee158f8
--- /dev/null
+++ b/extras/disk_usage_sync.sh
@@ -0,0 +1,86 @@
+#!/bin/sh
+
+# This script can be used to sync disk usage before activating quotas on GlusterFS.
+# There are two scenarios where quotas are used and this script has to be used accordingly - 
+#
+# 1. Server side
+# The script needs to be run with backend export directory as the argument.  This script updates
+# the current disk usage of the backend directory in a way that is intelligible to the GlusterFS quota 
+# translator. Make sure you run this script before starting glusterfsd (GlusterFS server process):
+#	* for the first time
+#	* after any server outage (reboot, etc.)
+
+# 2. Client side
+# The script needs to be run with the client mount point as the argument. It updates the current disk
+# of the GlusterFS volume is a way that is intelligible to the GlusterFS quota translator. Make sure
+# you run this script after a fresh mount of the GlusterFS volume on the client:
+#	* For the first time
+#	* After any client outage (reboot, remount, etc.)
+
+# Please note that this script is dependent on the 'attr' package, more specifically 'setfattr' to set 
+# extended attributes of files.
+# GlusterFS
+# 
+# (c) 2010 Gluster Inc <http://www.gluster.com/> 
+
+PROGRAM_NAME="disk_usage_sync.sh"
+
+#check if setfattr is available
+check_for_attr ()
+{
+    `command -v setfattr >/dev/null`
+    if [ "${?}" -gt 0 ]; then
+	echo >&2 "This script requires the 'attr' package to run. Either it has not been installed or is not present currently in the system path."
+	exit 1
+    fi
+
+}
+
+usage () {
+    echo >&2 "$PROGRAM_NAME - Command used to sync disk usage information before activating quotas on GlusterFS.
+
+usage: $PROGRAM_NAME <target-directory>"
+
+exit 1
+}
+
+TARGET_DIR=$1
+EXT_ATTR_NAME="trusted.glusterfs-quota-du"
+
+#output of du in number of bytes
+get_disk_usage ()
+{
+    if [ ! -d $TARGET_DIR ]; then
+	echo >&2 "Error: $TARGET_DIR does not exist."
+	exit 1
+    fi
+
+    DISK_USAGE=`du -bc $TARGET_DIR | grep 'total' | cut -f1`
+    if [ "${?}" -gt 0 ]; then
+	exit 1
+    fi
+
+}
+
+#set the extended attribute of the root directory with du size in bytes
+set_disk_usage ()
+{
+   ` setfattr -n $EXT_ATTR_NAME -v $DISK_USAGE $TARGET_DIR`
+    if [ "${?}" -gt 0 ]; then
+	exit 1
+    fi
+}
+
+main ()
+{
+    [ $# -lt 1 ] && usage
+
+    check_for_attr
+
+    get_disk_usage
+    set_disk_usage
+
+    printf "Disk Usage information has been sync'd successfully.\n"
+}
+
+main "$@"