FS-Cache: Count the number of initialised operations

Count and display through /proc/fs/fscache/stats the number of initialised
operations.

Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Steve Dickson <steved@redhat.com>
Acked-by: Jeff Layton <jeff.layton@primarydata.com>
diff --git a/fs/fscache/operation.c b/fs/fscache/operation.c
index 61a6e78..9761df4 100644
--- a/fs/fscache/operation.c
+++ b/fs/fscache/operation.c
@@ -39,6 +39,7 @@
 	op->processor = processor;
 	op->release = release;
 	INIT_LIST_HEAD(&op->pend_link);
+	fscache_stat(&fscache_n_op_initialised);
 }
 EXPORT_SYMBOL(fscache_operation_init);