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src/java.base/unix/native/libjava/io_util_md.c
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rev 16220 : 8168628: (fc) SIGBUS when extending file size to map it
Summary: Synchronize file extension and subsequent map0(); on Linux use fallocate64() instead of ftruncate64().
Reviewed-by: rehn, simonis, alanb
@@ -1,7 +1,7 @@
/*
- * Copyright (c) 2001, 2015, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2001, 2016, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
@@ -213,10 +213,24 @@
jint
handleSetLength(FD fd, jlong length)
{
int result;
+#if defined(__linux__)
+ /*
+ * On Linux, if the file size is being increased, then ftruncate64()
+ * will modify the metadata value of the size without actually allocating
+ * any blocks which can cause a SIGBUS error if the file is subsequently
+ * memory-mapped.
+ */
+ struct stat64 sb;
+
+ if (fstat64(fd, &sb) == 0 && length > sb.st_blocks*512) {
+ RESTARTABLE(fallocate64(fd, 0, 0, length), result);
+ return result;
+ }
+#endif
RESTARTABLE(ftruncate64(fd, length), result);
return result;
}
jlong
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