ntdb: use NTDB_LOG_WARNING level for failed open() without O_CREAT.

This is a fairly common pattern in Samba, and if we log an error on
every open it spams the logs.  On the other hand, other errors are
potentially more serious, so we still use NTDB_LOG_ERROR on them.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

2 files changed, 11 insertions, 1 deletions

diff --git a/lib/ntdb/ntdb.h b/lib/ntdb/ntdb.h
index f64b2f4a1b..f2b80023cd 100644
--- a/lib/ntdb/ntdb.h
+++ b/lib/ntdb/ntdb.h
@@ -727,6 +727,8 @@ struct ntdb_attribute_base {
  * @NTDB_LOG_WARNING: used for informational messages on issues which
  *		     are unusual but handled by NTDB internally, such
  *		     as a failure to mmap or failure to open /dev/urandom.
+ *		     It's also used when ntdb_open() fails without O_CREAT
+ *		     because a file does not exist.
  */
 enum ntdb_log_level {
 	NTDB_LOG_ERROR,
diff --git a/lib/ntdb/open.c b/lib/ntdb/open.c
index 8dce4ce6f2..56b504b5c0 100644
--- a/lib/ntdb/open.c
+++ b/lib/ntdb/open.c
@@ -517,9 +517,17 @@ _PUBLIC_ struct ntdb_context *ntdb_open(const char *name, int ntdb_flags,
 		ntdb->file->map_size = 0;
 
 		if ((ntdb->file->fd = open(name, open_flags, mode)) == -1) {
+			enum ntdb_log_level lvl;
 			/* errno set by open(2) */
 			saved_errno = errno;
-			ntdb_logerr(ntdb, NTDB_ERR_IO, NTDB_LOG_ERROR,
+
+			/* Probing for files like this is a common pattern. */
+			if (!(open_flags & O_CREAT) && errno == ENOENT) {
+				lvl = NTDB_LOG_WARNING;
+			} else {
+				lvl = NTDB_LOG_ERROR;
+			}
+			ntdb_logerr(ntdb, NTDB_ERR_IO, lvl,
 				   "ntdb_open: could not open file %s: %s",
 				   name, strerror(errno));