LU-2059 mgs: don't fail on missing params log

[fs/lustre-release.git] / lustre / obdclass / llog.c

diff --git a/lustre/obdclass/llog.c b/lustre/obdclass/llog.c
index 7146001..8202b41 100644 (file)
--- a/lustre/obdclass/llog.c
+++ b/lustre/obdclass/llog.c
@@ -942,6 +942,17 @@ out:
 }
 EXPORT_SYMBOL(llog_close);
 
+/**
+ * Helper function to get the llog size in records. It is used by MGS
+ * mostly to check that config llog exists and contains data.
+ *
+ * \param[in] env      execution environment
+ * \param[in] ctxt     llog context
+ * \param[in] name     llog name
+ *
+ * \retval             true if there are records in llog besides a header
+ * \retval             false on error or llog without records
+ */
 int llog_is_empty(const struct lu_env *env, struct llog_ctxt *ctxt,
                  char *name)
 {
@@ -963,7 +974,8 @@ int llog_is_empty(const struct lu_env *env, struct llog_ctxt *ctxt,
 out_close:
        llog_close(env, llh);
 out:
-       /* header is record 1 */
+       /* The header is record 1, the llog is still considered as empty
+        * if there is only header */
        return (rc <= 1);
 }
 EXPORT_SYMBOL(llog_is_empty);