block: disable sysfs parts of the disk command filter

We still have life time issues with the sysfs command filter kobject,
so disable it for 2.6.27 release. We can revisit this and make it work
properly for 2.6.28, for 2.6.27 release it's too risky.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/block/cmd-filter.c b/block/cmd-filter.c
index 228b644..79c1499 100644
--- a/block/cmd-filter.c
+++ b/block/cmd-filter.c
@@ -49,6 +49,7 @@
 }
 EXPORT_SYMBOL(blk_verify_command);
 
+#if 0
 /* and now, the sysfs stuff */
 static ssize_t rcf_cmds_show(struct blk_cmd_filter *filter, char *page,
 			     int rw)
@@ -233,3 +234,4 @@
 	kobject_put(disk->holder_dir->parent);
 }
 EXPORT_SYMBOL(blk_unregister_filter);
+#endif