ZFSDirPlugin: new plugin for local zfs storage

We also want to use this as base class for ZFSPlugin, to increase
code sharing.

PVE/Storage/ZFSDirPlugin.pm

@@ -0,0 +1,63 @@
+package PVE::Storage::ZFSDirPlugin;
+
+use strict;
+use warnings;
+use IO::File;
+use POSIX;
+use PVE::Tools qw(run_command);
+use PVE::Storage::Plugin;
+
+
+use base qw(PVE::Storage::Plugin);
+
+sub zfs_parse_size {
+    my ($text) = @_;
+
+    return 0 if !$text;
+
+    if ($text =~ m/^(\d+(\.\d+)?)([TGMK])?$/) {
+    my ($size, $reminder, $unit) = ($1, $2, $3);
+    return $size if !$unit;
+    if ($unit eq 'K') {
+        $size *= 1024;
+    } elsif ($unit eq 'M') {
+        $size *= 1024*1024;
+    } elsif ($unit eq 'G') {
+        $size *= 1024*1024*1024;
+    } elsif ($unit eq 'T') {
+        $size *= 1024*1024*1024*1024;
+    }
+
+    if ($reminder) {
+        $size = ceil($size);
+    }
+    return $size;
+    } else {
+    return 0;
+    }
+}
+
+sub type {
+    return 'zfsdir';
+}
+
+sub plugindata {
+    return {
+	content => [ { images => 1, rootdir => 1, vztmpl => 1, iso => 1, backup => 1},
+		     { images => 1 }],
+    };
+}   
+
+sub options {
+    return {
+	path => { fixed => 1 },
+        nodes => { optional => 1 },
+	disable => { optional => 1 },
+        maxfiles => { optional => 1 },
+	content => { optional => 1 },
+    };
+}
+
+# fixme: implement me
+
+1;