afs: add a file-level comment to afs_osidnlc.c

This file doesn't currently do a great job of telling the reader what
it's used for.  Let's give them a hint, especially for the expansion
of "DNLC".

Change-Id: Ie5d1f1162a4b59c479bc2961b33cd696e83bdc3a
Reviewed-on: https://gerrit.openafs.org/13557
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Michael Meffie <mmeffie@sinenomine.net>
Reviewed-by: Andrew Deason <adeason@sinenomine.net>
Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>

diff --git a/src/afs/afs_osidnlc.c b/src/afs/afs_osidnlc.c
index 974eb4b..ab451dd 100644 (file)
--- a/src/afs/afs_osidnlc.c
+++ b/src/afs/afs_osidnlc.c
@@ -7,6 +7,13 @@
  * directory or online at http://www.openafs.org/dl/license10.html
  */
 
+/*-
+ * OSI Directory Name Lookup Cache
+ *
+ * Keep a local cache of lookup results to avoid needing to examine the disk
+ * cache, for frequently accessed names.
+ */
+
 #include <afsconfig.h>
 #include "afs/param.h"