remap old size if new mmap fails

boltdb · Jul 18, 2017 · 657f184 · 657f184
1 parent 2f1ce7a
commit 657f184
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/db.go b/db.go
@@ -275,6 +275,11 @@ func (db *DB) mmap(minsz int) error {
 
 	// Memory-map the data file as a byte slice.
 	if err := mmap(db, size); err != nil {
+		// mmap failed; the system may have run out of space. Fallback to
+		// mapping the bare minimum needed for the current db size.
+		if err2 := mmap(db, db.datasz); err2 != nil {
+			panic(fmt.Sprintf("failed to revert db size after failed mmap: %v", err2))
+		}
 		return err
 	}