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#!/bin/bash
# Please leave 'added_bricks' as empty if you want 100% defrag.
# If you want to move data to newly added bricks, properly give
# brick info as "<hostname>:<export-dir>" form (which was given
# in 'gluster volume create' command)
# More than one brick can be given with space inbetween.
#
# (c) 2010 Gluster Inc <http://www.gluster.com/>
#
set -e;
added_bricks="node1:/gfs/export1"
CP="cp"
MV="mv"
scan_dir()
{
path=$1;
# run defrag on files first #
find "$path" -maxdepth 1 -type f -perm +01000 -exec $0 '{}' \;
for subdir in $(find "$path" -maxdepth 1 -type d | sed 1d); do
$0 "$subdir";
done
}
fix_xattr()
{
path=$1;
getfattr -n trusted.distribute.fix.layout "$path" 2>/dev/null;
}
rsync_filename()
{
path=$1
dir=$(dirname "$path");
file=$(basename "$path");
echo "$dir/.$file.zr$$";
}
relocate_file()
{
path=$1;
# Make sure we don't 'defrag' valid file.
stat_info=$(stat -c '%a' "$path");
if [ $stat_info -lt 1000 ] ; then
return;
fi
# If there are some entries in added_bricks, then check
# if the link file is present on those nodes, if not,
# set flag=1, so full defrag happens
flag=0;
for bricks in ${added_bricks}; do
linknode=$(getfattr --only-values -n trusted.distribute.linkinfo $path 2>/dev/null);
if [ -z $linknode ] ; then
return;
fi
current_brick=${linknode:0:${#bricks}};
if [ "${bricks}" == "${current_brick}" ]; then
flag=1;
fi
done
if [ -z ${added_bricks} ] ; then
flag=1;
fi
if [ $flag -ne 1 ]; then
return;
fi
tmp_path=$(rsync_filename "$path");
pre_mtime=$(stat -c '%Y' "$path");
$CP -a "$path" "$tmp_path";
post_mtime=$(stat -c '%Y' "$path");
if [ $pre_mtime = $post_mtime ]; then
chmod -t "$tmp_path";
$MV "$tmp_path" "$path";
echo "file '$path' relocated"
else
echo "file '$path' modified during defrag. skipping"
rm -f "$tmp_path";
fi
}
defrag_usage()
{
echo "Usage: $0 <directory>"
}
main()
{
path="$1";
if [ -z "$path" ]; then
defrag_usage;
return;
fi
if [ -d "$path" ]; then
fix_xattr "$path";
scan_dir "$path";
else
relocate_file "$@";
fi
}
main "$1"
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